drivers/char/synclinkmp.c

   1 /*
   2  * $Id: synclinkmp.c,v 4.38 2005/07/15 13:29:44 paulkf Exp $
   3  *
   4  * Device driver for Microgate SyncLink Multiport
   5  * high speed multiprotocol serial adapter.
   6  *
   7  * written by Paul Fulghum for Microgate Corporation
   8  * paulkf@microgate.com
   9  *
  10  * Microgate and SyncLink are trademarks of Microgate Corporation
  11  *
  12  * Derived from serial.c written by Theodore Ts'o and Linus Torvalds
  13  * This code is released under the GNU General Public License (GPL)
  14  *
  15  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  16  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  17  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  18  * DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
  19  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  20  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  21  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  23  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  24  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  25  * OF THE POSSIBILITY OF SUCH DAMAGE.
  26  */
  27
  28 #define VERSION(ver,rel,seq) (((ver)<<16) | ((rel)<<8) | (seq))
  29 #if defined(__i386__)
  30 #  define BREAKPOINT() asm("   int $3");
  31 #else
  32 #  define BREAKPOINT() { }
  33 #endif
  34
  35 #define MAX_DEVICES 12
  36
  37 #include <linux/module.h>
  38 #include <linux/errno.h>
  39 #include <linux/signal.h>
  40 #include <linux/sched.h>
  41 #include <linux/timer.h>
  42 #include <linux/interrupt.h>
  43 #include <linux/pci.h>
  44 #include <linux/tty.h>
  45 #include <linux/tty_flip.h>
  46 #include <linux/serial.h>
  47 #include <linux/major.h>
  48 #include <linux/string.h>
  49 #include <linux/fcntl.h>
  50 #include <linux/ptrace.h>
  51 #include <linux/ioport.h>
  52 #include <linux/mm.h>
  53 #include <linux/slab.h>
  54 #include <linux/netdevice.h>
  55 #include <linux/vmalloc.h>
  56 #include <linux/init.h>
  57 #include <linux/delay.h>
  58 #include <linux/ioctl.h>
  59
  60 #include <asm/system.h>
  61 #include <asm/io.h>
  62 #include <asm/irq.h>
  63 #include <asm/dma.h>
  64 #include <linux/bitops.h>
  65 #include <asm/types.h>
  66 #include <linux/termios.h>
  67 #include <linux/workqueue.h>
  68 #include <linux/hdlc.h>
  69 #include <linux/synclink.h>
  70
  71 #if defined(CONFIG_HDLC) || (defined(CONFIG_HDLC_MODULE) && defined(CONFIG_SYNCLINKMP_MODULE))
  72 #define SYNCLINK_GENERIC_HDLC 1
  73 #else
  74 #define SYNCLINK_GENERIC_HDLC 0
  75 #endif
  76
  77 #define GET_USER(error,value,addr) error = get_user(value,addr)
  78 #define COPY_FROM_USER(error,dest,src,size) error = copy_from_user(dest,src,size) ? -EFAULT : 0
  79 #define PUT_USER(error,value,addr) error = put_user(value,addr)
  80 #define COPY_TO_USER(error,dest,src,size) error = copy_to_user(dest,src,size) ? -EFAULT : 0
  81
  82 #include <asm/uaccess.h>
  83
  84 static MGSL_PARAMS default_params = {
  85         MGSL_MODE_HDLC,                 /* unsigned long mode */
  86         0,                              /* unsigned char loopback; */
  87         HDLC_FLAG_UNDERRUN_ABORT15,     /* unsigned short flags; */
  88         HDLC_ENCODING_NRZI_SPACE,       /* unsigned char encoding; */
  89         0,                              /* unsigned long clock_speed; */
  90         0xff,                           /* unsigned char addr_filter; */
  91         HDLC_CRC_16_CCITT,              /* unsigned short crc_type; */
  92         HDLC_PREAMBLE_LENGTH_8BITS,     /* unsigned char preamble_length; */
  93         HDLC_PREAMBLE_PATTERN_NONE,     /* unsigned char preamble; */
  94         9600,                           /* unsigned long data_rate; */
  95         8,                              /* unsigned char data_bits; */
  96         1,                              /* unsigned char stop_bits; */
  97         ASYNC_PARITY_NONE               /* unsigned char parity; */
  98 };
  99
 100 /* size in bytes of DMA data buffers */
 101 #define SCABUFSIZE      1024
 102 #define SCA_MEM_SIZE    0x40000
 103 #define SCA_BASE_SIZE   512
 104 #define SCA_REG_SIZE    16
 105 #define SCA_MAX_PORTS   4
 106 #define SCAMAXDESC      128
 107
 108 #define BUFFERLISTSIZE  4096
 109
 110 /* SCA-I style DMA buffer descriptor */
 111 typedef struct _SCADESC
 112 {
 113         u16     next;           /* lower l6 bits of next descriptor addr */
 114         u16     buf_ptr;        /* lower 16 bits of buffer addr */
 115         u8      buf_base;       /* upper 8 bits of buffer addr */
 116         u8      pad1;
 117         u16     length;         /* length of buffer */
 118         u8      status;         /* status of buffer */
 119         u8      pad2;
 120 } SCADESC, *PSCADESC;
 121
 122 typedef struct _SCADESC_EX
 123 {
 124         /* device driver bookkeeping section */
 125         char    *virt_addr;     /* virtual address of data buffer */
 126         u16     phys_entry;     /* lower 16-bits of physical address of this descriptor */
 127 } SCADESC_EX, *PSCADESC_EX;
 128
 129 /* The queue of BH actions to be performed */
 130
 131 #define BH_RECEIVE  1
 132 #define BH_TRANSMIT 2
 133 #define BH_STATUS   4
 134
 135 #define IO_PIN_SHUTDOWN_LIMIT 100
 136
 137 struct  _input_signal_events {
 138         int     ri_up;
 139         int     ri_down;
 140         int     dsr_up;
 141         int     dsr_down;
 142         int     dcd_up;
 143         int     dcd_down;
 144         int     cts_up;
 145         int     cts_down;
 146 };
 147
 148 /*
 149  * Device instance data structure
 150  */
 151 typedef struct _synclinkmp_info {
 152         void *if_ptr;                           /* General purpose pointer (used by SPPP) */
 153         int                     magic;
 154         int                     flags;
 155         int                     count;          /* count of opens */
 156         int                     line;
 157         unsigned short          close_delay;
 158         unsigned short          closing_wait;   /* time to wait before closing */
 159
 160         struct mgsl_icount      icount;
 161
 162         struct tty_struct       *tty;
 163         int                     timeout;
 164         int                     x_char;         /* xon/xoff character */
 165         int                     blocked_open;   /* # of blocked opens */
 166         u16                     read_status_mask1;  /* break detection (SR1 indications) */
 167         u16                     read_status_mask2;  /* parity/framing/overun (SR2 indications) */
 168         unsigned char           ignore_status_mask1;  /* break detection (SR1 indications) */
 169         unsigned char           ignore_status_mask2;  /* parity/framing/overun (SR2 indications) */
 170         unsigned char           *tx_buf;
 171         int                     tx_put;
 172         int                     tx_get;
 173         int                     tx_count;
 174
 175         wait_queue_head_t       open_wait;
 176         wait_queue_head_t       close_wait;
 177
 178         wait_queue_head_t       status_event_wait_q;
 179         wait_queue_head_t       event_wait_q;
 180         struct timer_list       tx_timer;       /* HDLC transmit timeout timer */
 181         struct _synclinkmp_info *next_device;   /* device list link */
 182         struct timer_list       status_timer;   /* input signal status check timer */
 183
 184         spinlock_t lock;                /* spinlock for synchronizing with ISR */
 185         struct work_struct task;                        /* task structure for scheduling bh */
 186
 187         u32 max_frame_size;                     /* as set by device config */
 188
 189         u32 pending_bh;
 190
 191         bool bh_running;                                /* Protection from multiple */
 192         int isr_overflow;
 193         bool bh_requested;
 194
 195         int dcd_chkcount;                       /* check counts to prevent */
 196         int cts_chkcount;                       /* too many IRQs if a signal */
 197         int dsr_chkcount;                       /* is floating */
 198         int ri_chkcount;
 199
 200         char *buffer_list;                      /* virtual address of Rx & Tx buffer lists */
 201         unsigned long buffer_list_phys;
 202
 203         unsigned int rx_buf_count;              /* count of total allocated Rx buffers */
 204         SCADESC *rx_buf_list;                   /* list of receive buffer entries */
 205         SCADESC_EX rx_buf_list_ex[SCAMAXDESC]; /* list of receive buffer entries */
 206         unsigned int current_rx_buf;
 207
 208         unsigned int tx_buf_count;              /* count of total allocated Tx buffers */
 209         SCADESC *tx_buf_list;           /* list of transmit buffer entries */
 210         SCADESC_EX tx_buf_list_ex[SCAMAXDESC]; /* list of transmit buffer entries */
 211         unsigned int last_tx_buf;
 212
 213         unsigned char *tmp_rx_buf;
 214         unsigned int tmp_rx_buf_count;
 215
 216         bool rx_enabled;
 217         bool rx_overflow;
 218
 219         bool tx_enabled;
 220         bool tx_active;
 221         u32 idle_mode;
 222
 223         unsigned char ie0_value;
 224         unsigned char ie1_value;
 225         unsigned char ie2_value;
 226         unsigned char ctrlreg_value;
 227         unsigned char old_signals;
 228
 229         char device_name[25];                   /* device instance name */
 230
 231         int port_count;
 232         int adapter_num;
 233         int port_num;
 234
 235         struct _synclinkmp_info *port_array[SCA_MAX_PORTS];
 236
 237         unsigned int bus_type;                  /* expansion bus type (ISA,EISA,PCI) */
 238
 239         unsigned int irq_level;                 /* interrupt level */
 240         unsigned long irq_flags;
 241         bool irq_requested;                     /* true if IRQ requested */
 242
 243         MGSL_PARAMS params;                     /* communications parameters */
 244
 245         unsigned char serial_signals;           /* current serial signal states */
 246
 247         bool irq_occurred;                      /* for diagnostics use */
 248         unsigned int init_error;                /* Initialization startup error */
 249
 250         u32 last_mem_alloc;
 251         unsigned char* memory_base;             /* shared memory address (PCI only) */
 252         u32 phys_memory_base;
 253         int shared_mem_requested;
 254
 255         unsigned char* sca_base;                /* HD64570 SCA Memory address */
 256         u32 phys_sca_base;
 257         u32 sca_offset;
 258         bool sca_base_requested;
 259
 260         unsigned char* lcr_base;                /* local config registers (PCI only) */
 261         u32 phys_lcr_base;
 262         u32 lcr_offset;
 263         int lcr_mem_requested;
 264
 265         unsigned char* statctrl_base;           /* status/control register memory */
 266         u32 phys_statctrl_base;
 267         u32 statctrl_offset;
 268         bool sca_statctrl_requested;
 269
 270         u32 misc_ctrl_value;
 271         char flag_buf[MAX_ASYNC_BUFFER_SIZE];
 272         char char_buf[MAX_ASYNC_BUFFER_SIZE];
 273         bool drop_rts_on_tx_done;
 274
 275         struct  _input_signal_events    input_signal_events;
 276
 277         /* SPPP/Cisco HDLC device parts */
 278         int netcount;
 279         int dosyncppp;
 280         spinlock_t netlock;
 281
 282 #if SYNCLINK_GENERIC_HDLC
 283         struct net_device *netdev;
 284 #endif
 285
 286 } SLMP_INFO;
 287
 288 #define MGSL_MAGIC 0x5401
 289
 290 /*
 291  * define serial signal status change macros
 292  */
 293 #define MISCSTATUS_DCD_LATCHED  (SerialSignal_DCD<<8)   /* indicates change in DCD */
 294 #define MISCSTATUS_RI_LATCHED   (SerialSignal_RI<<8)    /* indicates change in RI */
 295 #define MISCSTATUS_CTS_LATCHED  (SerialSignal_CTS<<8)   /* indicates change in CTS */
 296 #define MISCSTATUS_DSR_LATCHED  (SerialSignal_DSR<<8)   /* change in DSR */
 297
 298 /* Common Register macros */
 299 #define LPR     0x00
 300 #define PABR0   0x02
 301 #define PABR1   0x03
 302 #define WCRL    0x04
 303 #define WCRM    0x05
 304 #define WCRH    0x06
 305 #define DPCR    0x08
 306 #define DMER    0x09
 307 #define ISR0    0x10
 308 #define ISR1    0x11
 309 #define ISR2    0x12
 310 #define IER0    0x14
 311 #define IER1    0x15
 312 #define IER2    0x16
 313 #define ITCR    0x18
 314 #define INTVR   0x1a
 315 #define IMVR    0x1c
 316
 317 /* MSCI Register macros */
 318 #define TRB     0x20
 319 #define TRBL    0x20
 320 #define TRBH    0x21
 321 #define SR0     0x22
 322 #define SR1     0x23
 323 #define SR2     0x24
 324 #define SR3     0x25
 325 #define FST     0x26
 326 #define IE0     0x28
 327 #define IE1     0x29
 328 #define IE2     0x2a
 329 #define FIE     0x2b
 330 #define CMD     0x2c
 331 #define MD0     0x2e
 332 #define MD1     0x2f
 333 #define MD2     0x30
 334 #define CTL     0x31
 335 #define SA0     0x32
 336 #define SA1     0x33
 337 #define IDL     0x34
 338 #define TMC     0x35
 339 #define RXS     0x36
 340 #define TXS     0x37
 341 #define TRC0    0x38
 342 #define TRC1    0x39
 343 #define RRC     0x3a
 344 #define CST0    0x3c
 345 #define CST1    0x3d
 346
 347 /* Timer Register Macros */
 348 #define TCNT    0x60
 349 #define TCNTL   0x60
 350 #define TCNTH   0x61
 351 #define TCONR   0x62
 352 #define TCONRL  0x62
 353 #define TCONRH  0x63
 354 #define TMCS    0x64
 355 #define TEPR    0x65
 356
 357 /* DMA Controller Register macros */
 358 #define DARL    0x80
 359 #define DARH    0x81
 360 #define DARB    0x82
 361 #define BAR     0x80
 362 #define BARL    0x80
 363 #define BARH    0x81
 364 #define BARB    0x82
 365 #define SAR     0x84
 366 #define SARL    0x84
 367 #define SARH    0x85
 368 #define SARB    0x86
 369 #define CPB     0x86
 370 #define CDA     0x88
 371 #define CDAL    0x88
 372 #define CDAH    0x89
 373 #define EDA     0x8a
 374 #define EDAL    0x8a
 375 #define EDAH    0x8b
 376 #define BFL     0x8c
 377 #define BFLL    0x8c
 378 #define BFLH    0x8d
 379 #define BCR     0x8e
 380 #define BCRL    0x8e
 381 #define BCRH    0x8f
 382 #define DSR     0x90
 383 #define DMR     0x91
 384 #define FCT     0x93
 385 #define DIR     0x94
 386 #define DCMD    0x95
 387
 388 /* combine with timer or DMA register address */
 389 #define TIMER0  0x00
 390 #define TIMER1  0x08
 391 #define TIMER2  0x10
 392 #define TIMER3  0x18
 393 #define RXDMA   0x00
 394 #define TXDMA   0x20
 395
 396 /* SCA Command Codes */
 397 #define NOOP            0x00
 398 #define TXRESET         0x01
 399 #define TXENABLE        0x02
 400 #define TXDISABLE       0x03
 401 #define TXCRCINIT       0x04
 402 #define TXCRCEXCL       0x05
 403 #define TXEOM           0x06
 404 #define TXABORT         0x07
 405 #define MPON            0x08
 406 #define TXBUFCLR        0x09
 407 #define RXRESET         0x11
 408 #define RXENABLE        0x12
 409 #define RXDISABLE       0x13
 410 #define RXCRCINIT       0x14
 411 #define RXREJECT        0x15
 412 #define SEARCHMP        0x16
 413 #define RXCRCEXCL       0x17
 414 #define RXCRCCALC       0x18
 415 #define CHRESET         0x21
 416 #define HUNT            0x31
 417
 418 /* DMA command codes */
 419 #define SWABORT         0x01
 420 #define FEICLEAR        0x02
 421
 422 /* IE0 */
 423 #define TXINTE          BIT7
 424 #define RXINTE          BIT6
 425 #define TXRDYE          BIT1
 426 #define RXRDYE          BIT0
 427
 428 /* IE1 & SR1 */
 429 #define UDRN    BIT7
 430 #define IDLE    BIT6
 431 #define SYNCD   BIT4
 432 #define FLGD    BIT4
 433 #define CCTS    BIT3
 434 #define CDCD    BIT2
 435 #define BRKD    BIT1
 436 #define ABTD    BIT1
 437 #define GAPD    BIT1
 438 #define BRKE    BIT0
 439 #define IDLD    BIT0
 440
 441 /* IE2 & SR2 */
 442 #define EOM     BIT7
 443 #define PMP     BIT6
 444 #define SHRT    BIT6
 445 #define PE      BIT5
 446 #define ABT     BIT5
 447 #define FRME    BIT4
 448 #define RBIT    BIT4
 449 #define OVRN    BIT3
 450 #define CRCE    BIT2
 451
 452
 453 /*
 454  * Global linked list of SyncLink devices
 455  */
 456 static SLMP_INFO *synclinkmp_device_list = NULL;
 457 static int synclinkmp_adapter_count = -1;
 458 static int synclinkmp_device_count = 0;
 459
 460 /*
 461  * Set this param to non-zero to load eax with the
 462  * .text section address and breakpoint on module load.
 463  * This is useful for use with gdb and add-symbol-file command.
 464  */
 465 static int break_on_load=0;
 466
 467 /*
 468  * Driver major number, defaults to zero to get auto
 469  * assigned major number. May be forced as module parameter.
 470  */
 471 static int ttymajor=0;
 472
 473 /*
 474  * Array of user specified options for ISA adapters.
 475  */
 476 static int debug_level = 0;
 477 static int maxframe[MAX_DEVICES] = {0,};
 478 static int dosyncppp[MAX_DEVICES] = {0,};
 479
 480 module_param(break_on_load, bool, 0);
 481 module_param(ttymajor, int, 0);
 482 module_param(debug_level, int, 0);
 483 module_param_array(maxframe, int, NULL, 0);
 484 module_param_array(dosyncppp, int, NULL, 0);
 485
 486 static char *driver_name = "SyncLink MultiPort driver";
 487 static char *driver_version = "$Revision: 4.38 $";
 488
 489 static int synclinkmp_init_one(struct pci_dev *dev,const struct pci_device_id *ent);
 490 static void synclinkmp_remove_one(struct pci_dev *dev);
 491
 492 static struct pci_device_id synclinkmp_pci_tbl[] = {
 493         { PCI_VENDOR_ID_MICROGATE, PCI_DEVICE_ID_MICROGATE_SCA, PCI_ANY_ID, PCI_ANY_ID, },
 494         { 0, }, /* terminate list */
 495 };
 496 MODULE_DEVICE_TABLE(pci, synclinkmp_pci_tbl);
 497
 498 MODULE_LICENSE("GPL");
 499
 500 static struct pci_driver synclinkmp_pci_driver = {
 501         .name           = "synclinkmp",
 502         .id_table       = synclinkmp_pci_tbl,
 503         .probe          = synclinkmp_init_one,
 504         .remove         = __devexit_p(synclinkmp_remove_one),
 505 };
 506
 507
 508 static struct tty_driver *serial_driver;
 509
 510 /* number of characters left in xmit buffer before we ask for more */
 511 #define WAKEUP_CHARS 256
 512
 513
 514 /* tty callbacks */
 515
 516 static int  open(struct tty_struct *tty, struct file * filp);
 517 static void close(struct tty_struct *tty, struct file * filp);
 518 static void hangup(struct tty_struct *tty);
 519 static void set_termios(struct tty_struct *tty, struct ktermios *old_termios);
 520
 521 static int  write(struct tty_struct *tty, const unsigned char *buf, int count);
 522 static int put_char(struct tty_struct *tty, unsigned char ch);
 523 static void send_xchar(struct tty_struct *tty, char ch);
 524 static void wait_until_sent(struct tty_struct *tty, int timeout);
 525 static int  write_room(struct tty_struct *tty);
 526 static void flush_chars(struct tty_struct *tty);
 527 static void flush_buffer(struct tty_struct *tty);
 528 static void tx_hold(struct tty_struct *tty);
 529 static void tx_release(struct tty_struct *tty);
 530
 531 static int  ioctl(struct tty_struct *tty, struct file *file, unsigned int cmd, unsigned long arg);
 532 static int  read_proc(char *page, char **start, off_t off, int count,int *eof, void *data);
 533 static int  chars_in_buffer(struct tty_struct *tty);
 534 static void throttle(struct tty_struct * tty);
 535 static void unthrottle(struct tty_struct * tty);
 536 static void set_break(struct tty_struct *tty, int break_state);
 537
 538 #if SYNCLINK_GENERIC_HDLC
 539 #define dev_to_port(D) (dev_to_hdlc(D)->priv)
 540 static void hdlcdev_tx_done(SLMP_INFO *info);
 541 static void hdlcdev_rx(SLMP_INFO *info, char *buf, int size);
 542 static int  hdlcdev_init(SLMP_INFO *info);
 543 static void hdlcdev_exit(SLMP_INFO *info);
 544 #endif
 545
 546 /* ioctl handlers */
 547
 548 static int  get_stats(SLMP_INFO *info, struct mgsl_icount __user *user_icount);
 549 static int  get_params(SLMP_INFO *info, MGSL_PARAMS __user *params);
 550 static int  set_params(SLMP_INFO *info, MGSL_PARAMS __user *params);
 551 static int  get_txidle(SLMP_INFO *info, int __user *idle_mode);
 552 static int  set_txidle(SLMP_INFO *info, int idle_mode);
 553 static int  tx_enable(SLMP_INFO *info, int enable);
 554 static int  tx_abort(SLMP_INFO *info);
 555 static int  rx_enable(SLMP_INFO *info, int enable);
 556 static int  modem_input_wait(SLMP_INFO *info,int arg);
 557 static int  wait_mgsl_event(SLMP_INFO *info, int __user *mask_ptr);
 558 static int  tiocmget(struct tty_struct *tty, struct file *file);
 559 static int  tiocmset(struct tty_struct *tty, struct file *file,
 560                      unsigned int set, unsigned int clear);
 561 static void set_break(struct tty_struct *tty, int break_state);
 562
 563 static void add_device(SLMP_INFO *info);
 564 static void device_init(int adapter_num, struct pci_dev *pdev);
 565 static int  claim_resources(SLMP_INFO *info);
 566 static void release_resources(SLMP_INFO *info);
 567
 568 static int  startup(SLMP_INFO *info);
 569 static int  block_til_ready(struct tty_struct *tty, struct file * filp,SLMP_INFO *info);
 570 static void shutdown(SLMP_INFO *info);
 571 static void program_hw(SLMP_INFO *info);
 572 static void change_params(SLMP_INFO *info);
 573
 574 static bool init_adapter(SLMP_INFO *info);
 575 static bool register_test(SLMP_INFO *info);
 576 static bool irq_test(SLMP_INFO *info);
 577 static bool loopback_test(SLMP_INFO *info);
 578 static int  adapter_test(SLMP_INFO *info);
 579 static bool memory_test(SLMP_INFO *info);
 580
 581 static void reset_adapter(SLMP_INFO *info);
 582 static void reset_port(SLMP_INFO *info);
 583 static void async_mode(SLMP_INFO *info);
 584 static void hdlc_mode(SLMP_INFO *info);
 585
 586 static void rx_stop(SLMP_INFO *info);
 587 static void rx_start(SLMP_INFO *info);
 588 static void rx_reset_buffers(SLMP_INFO *info);
 589 static void rx_free_frame_buffers(SLMP_INFO *info, unsigned int first, unsigned int last);
 590 static bool rx_get_frame(SLMP_INFO *info);
 591
 592 static void tx_start(SLMP_INFO *info);
 593 static void tx_stop(SLMP_INFO *info);
 594 static void tx_load_fifo(SLMP_INFO *info);
 595 static void tx_set_idle(SLMP_INFO *info);
 596 static void tx_load_dma_buffer(SLMP_INFO *info, const char *buf, unsigned int count);
 597
 598 static void get_signals(SLMP_INFO *info);
 599 static void set_signals(SLMP_INFO *info);
 600 static void enable_loopback(SLMP_INFO *info, int enable);
 601 static void set_rate(SLMP_INFO *info, u32 data_rate);
 602
 603 static int  bh_action(SLMP_INFO *info);
 604 static void bh_handler(struct work_struct *work);
 605 static void bh_receive(SLMP_INFO *info);
 606 static void bh_transmit(SLMP_INFO *info);
 607 static void bh_status(SLMP_INFO *info);
 608 static void isr_timer(SLMP_INFO *info);
 609 static void isr_rxint(SLMP_INFO *info);
 610 static void isr_rxrdy(SLMP_INFO *info);
 611 static void isr_txint(SLMP_INFO *info);
 612 static void isr_txrdy(SLMP_INFO *info);
 613 static void isr_rxdmaok(SLMP_INFO *info);
 614 static void isr_rxdmaerror(SLMP_INFO *info);
 615 static void isr_txdmaok(SLMP_INFO *info);
 616 static void isr_txdmaerror(SLMP_INFO *info);
 617 static void isr_io_pin(SLMP_INFO *info, u16 status);
 618
 619 static int  alloc_dma_bufs(SLMP_INFO *info);
 620 static void free_dma_bufs(SLMP_INFO *info);
 621 static int  alloc_buf_list(SLMP_INFO *info);
 622 static int  alloc_frame_bufs(SLMP_INFO *info, SCADESC *list, SCADESC_EX *list_ex,int count);
 623 static int  alloc_tmp_rx_buf(SLMP_INFO *info);
 624 static void free_tmp_rx_buf(SLMP_INFO *info);
 625
 626 static void load_pci_memory(SLMP_INFO *info, char* dest, const char* src, unsigned short count);
 627 static void trace_block(SLMP_INFO *info, const char* data, int count, int xmit);
 628 static void tx_timeout(unsigned long context);
 629 static void status_timeout(unsigned long context);
 630
 631 static unsigned char read_reg(SLMP_INFO *info, unsigned char addr);
 632 static void write_reg(SLMP_INFO *info, unsigned char addr, unsigned char val);
 633 static u16 read_reg16(SLMP_INFO *info, unsigned char addr);
 634 static void write_reg16(SLMP_INFO *info, unsigned char addr, u16 val);
 635 static unsigned char read_status_reg(SLMP_INFO * info);
 636 static void write_control_reg(SLMP_INFO * info);
 637
 638
 639 static unsigned char rx_active_fifo_level = 16; // rx request FIFO activation level in bytes
 640 static unsigned char tx_active_fifo_level = 16; // tx request FIFO activation level in bytes
 641 static unsigned char tx_negate_fifo_level = 32; // tx request FIFO negation level in bytes
 642
 643 static u32 misc_ctrl_value = 0x007e4040;
 644 static u32 lcr1_brdr_value = 0x00800028;
 645
 646 static u32 read_ahead_count = 8;
 647
 648 /* DPCR, DMA Priority Control
 649  *
 650  * 07..05  Not used, must be 0
 651  * 04      BRC, bus release condition: 0=all transfers complete
 652  *              1=release after 1 xfer on all channels
 653  * 03      CCC, channel change condition: 0=every cycle
 654  *              1=after each channel completes all xfers
 655  * 02..00  PR<2..0>, priority 100=round robin
 656  *
 657  * 00000100 = 0x00
 658  */
 659 static unsigned char dma_priority = 0x04;
 660
 661 // Number of bytes that can be written to shared RAM
 662 // in a single write operation
 663 static u32 sca_pci_load_interval = 64;
 664
 665 /*
 666  * 1st function defined in .text section. Calling this function in
 667  * init_module() followed by a breakpoint allows a remote debugger
 668  * (gdb) to get the .text address for the add-symbol-file command.
 669  * This allows remote debugging of dynamically loadable modules.
 670  */
 671 static void* synclinkmp_get_text_ptr(void);
 672 static void* synclinkmp_get_text_ptr(void) {return synclinkmp_get_text_ptr;}
 673
 674 static inline int sanity_check(SLMP_INFO *info,
 675                                char *name, const char *routine)
 676 {
 677 #ifdef SANITY_CHECK
 678         static const char *badmagic =
 679                 "Warning: bad magic number for synclinkmp_struct (%s) in %s\n";
 680         static const char *badinfo =
 681                 "Warning: null synclinkmp_struct for (%s) in %s\n";
 682
 683         if (!info) {
 684                 printk(badinfo, name, routine);
 685                 return 1;
 686         }
 687         if (info->magic != MGSL_MAGIC) {
 688                 printk(badmagic, name, routine);
 689                 return 1;
 690         }
 691 #else
 692         if (!info)
 693                 return 1;
 694 #endif
 695         return 0;
 696 }
 697
 698 /**
 699  * line discipline callback wrappers
 700  *
 701  * The wrappers maintain line discipline references
 702  * while calling into the line discipline.
 703  *
 704  * ldisc_receive_buf  - pass receive data to line discipline
 705  */
 706
 707 static void ldisc_receive_buf(struct tty_struct *tty,
 708                               const __u8 *data, char *flags, int count)
 709 {
 710         struct tty_ldisc *ld;
 711         if (!tty)
 712                 return;
 713         ld = tty_ldisc_ref(tty);
 714         if (ld) {
 715                 if (ld->receive_buf)
 716                         ld->receive_buf(tty, data, flags, count);
 717                 tty_ldisc_deref(ld);
 718         }
 719 }
 720
 721 /* tty callbacks */
 722
 723 /* Called when a port is opened.  Init and enable port.
 724  */
 725 static int open(struct tty_struct *tty, struct file *filp)
 726 {
 727         SLMP_INFO *info;
 728         int retval, line;
 729         unsigned long flags;
 730
 731         line = tty->index;
 732         if ((line < 0) || (line >= synclinkmp_device_count)) {
 733                 printk("%s(%d): open with invalid line #%d.\n",
 734                         __FILE__,__LINE__,line);
 735                 return -ENODEV;
 736         }
 737
 738         info = synclinkmp_device_list;
 739         while(info && info->line != line)
 740                 info = info->next_device;
 741         if (sanity_check(info, tty->name, "open"))
 742                 return -ENODEV;
 743         if ( info->init_error ) {
 744                 printk("%s(%d):%s device is not allocated, init error=%d\n",
 745                         __FILE__,__LINE__,info->device_name,info->init_error);
 746                 return -ENODEV;
 747         }
 748
 749         tty->driver_data = info;
 750         info->tty = tty;
 751
 752         if (debug_level >= DEBUG_LEVEL_INFO)
 753                 printk("%s(%d):%s open(), old ref count = %d\n",
 754                          __FILE__,__LINE__,tty->driver->name, info->count);
 755
 756         /* If port is closing, signal caller to try again */
 757         if (tty_hung_up_p(filp) || info->flags & ASYNC_CLOSING){
 758                 if (info->flags & ASYNC_CLOSING)
 759                         interruptible_sleep_on(&info->close_wait);
 760                 retval = ((info->flags & ASYNC_HUP_NOTIFY) ?
 761                         -EAGAIN : -ERESTARTSYS);
 762                 goto cleanup;
 763         }
 764
 765         info->tty->low_latency = (info->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
 766
 767         spin_lock_irqsave(&info->netlock, flags);
 768         if (info->netcount) {
 769                 retval = -EBUSY;
 770                 spin_unlock_irqrestore(&info->netlock, flags);
 771                 goto cleanup;
 772         }
 773         info->count++;
 774         spin_unlock_irqrestore(&info->netlock, flags);
 775
 776         if (info->count == 1) {
 777                 /* 1st open on this device, init hardware */
 778                 retval = startup(info);
 779                 if (retval < 0)
 780                         goto cleanup;
 781         }
 782
 783         retval = block_til_ready(tty, filp, info);
 784         if (retval) {
 785                 if (debug_level >= DEBUG_LEVEL_INFO)
 786                         printk("%s(%d):%s block_til_ready() returned %d\n",
 787                                  __FILE__,__LINE__, info->device_name, retval);
 788                 goto cleanup;
 789         }
 790
 791         if (debug_level >= DEBUG_LEVEL_INFO)
 792                 printk("%s(%d):%s open() success\n",
 793                          __FILE__,__LINE__, info->device_name);
 794         retval = 0;
 795
 796 cleanup:
 797         if (retval) {
 798                 if (tty->count == 1)
 799                         info->tty = NULL; /* tty layer will release tty struct */
 800                 if(info->count)
 801                         info->count--;
 802         }
 803
 804         return retval;
 805 }
 806
 807 /* Called when port is closed. Wait for remaining data to be
 808  * sent. Disable port and free resources.
 809  */
 810 static void close(struct tty_struct *tty, struct file *filp)
 811 {
 812         SLMP_INFO * info = (SLMP_INFO *)tty->driver_data;
 813
 814         if (sanity_check(info, tty->name, "close"))
 815                 return;
 816
 817         if (debug_level >= DEBUG_LEVEL_INFO)
 818                 printk("%s(%d):%s close() entry, count=%d\n",
 819                          __FILE__,__LINE__, info->device_name, info->count);
 820
 821         if (!info->count)
 822                 return;
 823
 824         if (tty_hung_up_p(filp))
 825                 goto cleanup;
 826
 827         if ((tty->count == 1) && (info->count != 1)) {
 828                 /*
 829                  * tty->count is 1 and the tty structure will be freed.
 830                  * info->count should be one in this case.
 831                  * if it's not, correct it so that the port is shutdown.
 832                  */
 833                 printk("%s(%d):%s close: bad refcount; tty->count is 1, "
 834                        "info->count is %d\n",
 835                          __FILE__,__LINE__, info->device_name, info->count);
 836                 info->count = 1;
 837         }
 838
 839         info->count--;
 840
 841         /* if at least one open remaining, leave hardware active */
 842         if (info->count)
 843                 goto cleanup;
 844
 845         info->flags |= ASYNC_CLOSING;
 846
 847         /* set tty->closing to notify line discipline to
 848          * only process XON/XOFF characters. Only the N_TTY
 849          * discipline appears to use this (ppp does not).
 850          */
 851         tty->closing = 1;
 852
 853         /* wait for transmit data to clear all layers */
 854
 855         if (info->closing_wait != ASYNC_CLOSING_WAIT_NONE) {
 856                 if (debug_level >= DEBUG_LEVEL_INFO)
 857                         printk("%s(%d):%s close() calling tty_wait_until_sent\n",
 858                                  __FILE__,__LINE__, info->device_name );
 859                 tty_wait_until_sent(tty, info->closing_wait);
 860         }
 861
 862         if (info->flags & ASYNC_INITIALIZED)
 863                 wait_until_sent(tty, info->timeout);
 864
 865         flush_buffer(tty);
 866
 867         tty_ldisc_flush(tty);
 868
 869         shutdown(info);
 870
 871         tty->closing = 0;
 872         info->tty = NULL;
 873
 874         if (info->blocked_open) {
 875                 if (info->close_delay) {
 876                         msleep_interruptible(jiffies_to_msecs(info->close_delay));
 877                 }
 878                 wake_up_interruptible(&info->open_wait);
 879         }
 880
 881         info->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING);
 882
 883         wake_up_interruptible(&info->close_wait);
 884
 885 cleanup:
 886         if (debug_level >= DEBUG_LEVEL_INFO)
 887                 printk("%s(%d):%s close() exit, count=%d\n", __FILE__,__LINE__,
 888                         tty->driver->name, info->count);
 889 }
 890
 891 /* Called by tty_hangup() when a hangup is signaled.
 892  * This is the same as closing all open descriptors for the port.
 893  */
 894 static void hangup(struct tty_struct *tty)
 895 {
 896         SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
 897
 898         if (debug_level >= DEBUG_LEVEL_INFO)
 899                 printk("%s(%d):%s hangup()\n",
 900                          __FILE__,__LINE__, info->device_name );
 901
 902         if (sanity_check(info, tty->name, "hangup"))
 903                 return;
 904
 905         flush_buffer(tty);
 906         shutdown(info);
 907
 908         info->count = 0;
 909         info->flags &= ~ASYNC_NORMAL_ACTIVE;
 910         info->tty = NULL;
 911
 912         wake_up_interruptible(&info->open_wait);
 913 }
 914
 915 /* Set new termios settings
 916  */
 917 static void set_termios(struct tty_struct *tty, struct ktermios *old_termios)
 918 {
 919         SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
 920         unsigned long flags;
 921
 922         if (debug_level >= DEBUG_LEVEL_INFO)
 923                 printk("%s(%d):%s set_termios()\n", __FILE__,__LINE__,
 924                         tty->driver->name );
 925
 926         change_params(info);
 927
 928         /* Handle transition to B0 status */
 929         if (old_termios->c_cflag & CBAUD &&
 930             !(tty->termios->c_cflag & CBAUD)) {
 931                 info->serial_signals &= ~(SerialSignal_RTS + SerialSignal_DTR);
 932                 spin_lock_irqsave(&info->lock,flags);
 933                 set_signals(info);
 934                 spin_unlock_irqrestore(&info->lock,flags);
 935         }
 936
 937         /* Handle transition away from B0 status */
 938         if (!(old_termios->c_cflag & CBAUD) &&
 939             tty->termios->c_cflag & CBAUD) {
 940                 info->serial_signals |= SerialSignal_DTR;
 941                 if (!(tty->termios->c_cflag & CRTSCTS) ||
 942                     !test_bit(TTY_THROTTLED, &tty->flags)) {
 943                         info->serial_signals |= SerialSignal_RTS;
 944                 }
 945                 spin_lock_irqsave(&info->lock,flags);
 946                 set_signals(info);
 947                 spin_unlock_irqrestore(&info->lock,flags);
 948         }
 949
 950         /* Handle turning off CRTSCTS */
 951         if (old_termios->c_cflag & CRTSCTS &&
 952             !(tty->termios->c_cflag & CRTSCTS)) {
 953                 tty->hw_stopped = 0;
 954                 tx_release(tty);
 955         }
 956 }
 957
 958 /* Send a block of data
 959  *
 960  * Arguments:
 961  *
 962  *      tty             pointer to tty information structure
 963  *      buf             pointer to buffer containing send data
 964  *      count           size of send data in bytes
 965  *
 966  * Return Value:        number of characters written
 967  */
 968 static int write(struct tty_struct *tty,
 969                  const unsigned char *buf, int count)
 970 {
 971         int     c, ret = 0;
 972         SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
 973         unsigned long flags;
 974
 975         if (debug_level >= DEBUG_LEVEL_INFO)
 976                 printk("%s(%d):%s write() count=%d\n",
 977                        __FILE__,__LINE__,info->device_name,count);
 978
 979         if (sanity_check(info, tty->name, "write"))
 980                 goto cleanup;
 981
 982         if (!info->tx_buf)
 983                 goto cleanup;
 984
 985         if (info->params.mode == MGSL_MODE_HDLC) {
 986                 if (count > info->max_frame_size) {
 987                         ret = -EIO;
 988                         goto cleanup;
 989                 }
 990                 if (info->tx_active)
 991                         goto cleanup;
 992                 if (info->tx_count) {
 993                         /* send accumulated data from send_char() calls */
 994                         /* as frame and wait before accepting more data. */
 995                         tx_load_dma_buffer(info, info->tx_buf, info->tx_count);
 996                         goto start;
 997                 }
 998                 ret = info->tx_count = count;
 999                 tx_load_dma_buffer(info, buf, count);
1000                 goto start;
1001         }
1002
1003         for (;;) {
1004                 c = min_t(int, count,
1005                         min(info->max_frame_size - info->tx_count - 1,
1006                             info->max_frame_size - info->tx_put));
1007                 if (c <= 0)
1008                         break;
1009
1010                 memcpy(info->tx_buf + info->tx_put, buf, c);
1011
1012                 spin_lock_irqsave(&info->lock,flags);
1013                 info->tx_put += c;
1014                 if (info->tx_put >= info->max_frame_size)
1015                         info->tx_put -= info->max_frame_size;
1016                 info->tx_count += c;
1017                 spin_unlock_irqrestore(&info->lock,flags);
1018
1019                 buf += c;
1020                 count -= c;
1021                 ret += c;
1022         }
1023
1024         if (info->params.mode == MGSL_MODE_HDLC) {
1025                 if (count) {
1026                         ret = info->tx_count = 0;
1027                         goto cleanup;
1028                 }
1029                 tx_load_dma_buffer(info, info->tx_buf, info->tx_count);
1030         }
1031 start:
1032         if (info->tx_count && !tty->stopped && !tty->hw_stopped) {
1033                 spin_lock_irqsave(&info->lock,flags);
1034                 if (!info->tx_active)
1035                         tx_start(info);
1036                 spin_unlock_irqrestore(&info->lock,flags);
1037         }
1038
1039 cleanup:
1040         if (debug_level >= DEBUG_LEVEL_INFO)
1041                 printk( "%s(%d):%s write() returning=%d\n",
1042                         __FILE__,__LINE__,info->device_name,ret);
1043         return ret;
1044 }
1045
1046 /* Add a character to the transmit buffer.
1047  */
1048 static int put_char(struct tty_struct *tty, unsigned char ch)
1049 {
1050         SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
1051         unsigned long flags;
1052         int ret = 0;
1053
1054         if ( debug_level >= DEBUG_LEVEL_INFO ) {
1055                 printk( "%s(%d):%s put_char(%d)\n",
1056                         __FILE__,__LINE__,info->device_name,ch);
1057         }
1058
1059         if (sanity_check(info, tty->name, "put_char"))
1060                 return 0;
1061
1062         if (!info->tx_buf)
1063                 return 0;
1064
1065         spin_lock_irqsave(&info->lock,flags);
1066
1067         if ( (info->params.mode != MGSL_MODE_HDLC) ||
1068              !info->tx_active ) {
1069
1070                 if (info->tx_count < info->max_frame_size - 1) {
1071                         info->tx_buf[info->tx_put++] = ch;
1072                         if (info->tx_put >= info->max_frame_size)
1073                                 info->tx_put -= info->max_frame_size;
1074                         info->tx_count++;
1075                         ret = 1;
1076                 }
1077         }
1078
1079         spin_unlock_irqrestore(&info->lock,flags);
1080         return ret;
1081 }
1082
1083 /* Send a high-priority XON/XOFF character
1084  */
1085 static void send_xchar(struct tty_struct *tty, char ch)
1086 {
1087         SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
1088         unsigned long flags;
1089
1090         if (debug_level >= DEBUG_LEVEL_INFO)
1091                 printk("%s(%d):%s send_xchar(%d)\n",
1092                          __FILE__,__LINE__, info->device_name, ch );
1093
1094         if (sanity_check(info, tty->name, "send_xchar"))
1095                 return;
1096
1097         info->x_char = ch;
1098         if (ch) {
1099                 /* Make sure transmit interrupts are on */
1100                 spin_lock_irqsave(&info->lock,flags);
1101                 if (!info->tx_enabled)
1102                         tx_start(info);
1103                 spin_unlock_irqrestore(&info->lock,flags);
1104         }
1105 }
1106
1107 /* Wait until the transmitter is empty.
1108  */
1109 static void wait_until_sent(struct tty_struct *tty, int timeout)
1110 {
1111         SLMP_INFO * info = (SLMP_INFO *)tty->driver_data;
1112         unsigned long orig_jiffies, char_time;
1113
1114         if (!info )
1115                 return;
1116
1117         if (debug_level >= DEBUG_LEVEL_INFO)
1118                 printk("%s(%d):%s wait_until_sent() entry\n",
1119                          __FILE__,__LINE__, info->device_name );
1120
1121         if (sanity_check(info, tty->name, "wait_until_sent"))
1122                 return;
1123
1124         lock_kernel();
1125
1126         if (!(info->flags & ASYNC_INITIALIZED))
1127                 goto exit;
1128
1129         orig_jiffies = jiffies;
1130
1131         /* Set check interval to 1/5 of estimated time to
1132          * send a character, and make it at least 1. The check
1133          * interval should also be less than the timeout.
1134          * Note: use tight timings here to satisfy the NIST-PCTS.
1135          */
1136
1137         if ( info->params.data_rate ) {
1138                 char_time = info->timeout/(32 * 5);
1139                 if (!char_time)
1140                         char_time++;
1141         } else
1142                 char_time = 1;
1143
1144         if (timeout)
1145                 char_time = min_t(unsigned long, char_time, timeout);
1146
1147         if ( info->params.mode == MGSL_MODE_HDLC ) {
1148                 while (info->tx_active) {
1149                         msleep_interruptible(jiffies_to_msecs(char_time));
1150                         if (signal_pending(current))
1151                                 break;
1152                         if (timeout && time_after(jiffies, orig_jiffies + timeout))
1153                                 break;
1154                 }
1155         } else {
1156                 //TODO: determine if there is something similar to USC16C32
1157                 //      TXSTATUS_ALL_SENT status
1158                 while ( info->tx_active && info->tx_enabled) {
1159                         msleep_interruptible(jiffies_to_msecs(char_time));
1160                         if (signal_pending(current))
1161                                 break;
1162                         if (timeout && time_after(jiffies, orig_jiffies + timeout))
1163                                 break;
1164                 }
1165         }
1166
1167 exit:
1168         unlock_kernel();
1169         if (debug_level >= DEBUG_LEVEL_INFO)
1170                 printk("%s(%d):%s wait_until_sent() exit\n",
1171                          __FILE__,__LINE__, info->device_name );
1172 }
1173
1174 /* Return the count of free bytes in transmit buffer
1175  */
1176 static int write_room(struct tty_struct *tty)
1177 {
1178         SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
1179         int ret;
1180
1181         if (sanity_check(info, tty->name, "write_room"))
1182                 return 0;
1183
1184         lock_kernel();
1185         if (info->params.mode == MGSL_MODE_HDLC) {
1186                 ret = (info->tx_active) ? 0 : HDLC_MAX_FRAME_SIZE;
1187         } else {
1188                 ret = info->max_frame_size - info->tx_count - 1;
1189                 if (ret < 0)
1190                         ret = 0;
1191         }
1192         unlock_kernel();
1193
1194         if (debug_level >= DEBUG_LEVEL_INFO)
1195                 printk("%s(%d):%s write_room()=%d\n",
1196                        __FILE__, __LINE__, info->device_name, ret);
1197
1198         return ret;
1199 }
1200
1201 /* enable transmitter and send remaining buffered characters
1202  */
1203 static void flush_chars(struct tty_struct *tty)
1204 {
1205         SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
1206         unsigned long flags;
1207
1208         if ( debug_level >= DEBUG_LEVEL_INFO )
1209                 printk( "%s(%d):%s flush_chars() entry tx_count=%d\n",
1210                         __FILE__,__LINE__,info->device_name,info->tx_count);
1211
1212         if (sanity_check(info, tty->name, "flush_chars"))
1213                 return;
1214
1215         if (info->tx_count <= 0 || tty->stopped || tty->hw_stopped ||
1216             !info->tx_buf)
1217                 return;
1218
1219         if ( debug_level >= DEBUG_LEVEL_INFO )
1220                 printk( "%s(%d):%s flush_chars() entry, starting transmitter\n",
1221                         __FILE__,__LINE__,info->device_name );
1222
1223         spin_lock_irqsave(&info->lock,flags);
1224
1225         if (!info->tx_active) {
1226                 if ( (info->params.mode == MGSL_MODE_HDLC) &&
1227                         info->tx_count ) {
1228                         /* operating in synchronous (frame oriented) mode */
1229                         /* copy data from circular tx_buf to */
1230                         /* transmit DMA buffer. */
1231                         tx_load_dma_buffer(info,
1232                                  info->tx_buf,info->tx_count);
1233                 }
1234                 tx_start(info);
1235         }
1236
1237         spin_unlock_irqrestore(&info->lock,flags);
1238 }
1239
1240 /* Discard all data in the send buffer
1241  */
1242 static void flush_buffer(struct tty_struct *tty)
1243 {
1244         SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
1245         unsigned long flags;
1246
1247         if (debug_level >= DEBUG_LEVEL_INFO)
1248                 printk("%s(%d):%s flush_buffer() entry\n",
1249                          __FILE__,__LINE__, info->device_name );
1250
1251         if (sanity_check(info, tty->name, "flush_buffer"))
1252                 return;
1253
1254         spin_lock_irqsave(&info->lock,flags);
1255         info->tx_count = info->tx_put = info->tx_get = 0;
1256         del_timer(&info->tx_timer);
1257         spin_unlock_irqrestore(&info->lock,flags);
1258
1259         tty_wakeup(tty);
1260 }
1261
1262 /* throttle (stop) transmitter
1263  */
1264 static void tx_hold(struct tty_struct *tty)
1265 {
1266         SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
1267         unsigned long flags;
1268
1269         if (sanity_check(info, tty->name, "tx_hold"))
1270                 return;
1271
1272         if ( debug_level >= DEBUG_LEVEL_INFO )
1273                 printk("%s(%d):%s tx_hold()\n",
1274                         __FILE__,__LINE__,info->device_name);
1275
1276         spin_lock_irqsave(&info->lock,flags);
1277         if (info->tx_enabled)
1278                 tx_stop(info);
1279         spin_unlock_irqrestore(&info->lock,flags);
1280 }
1281
1282 /* release (start) transmitter
1283  */
1284 static void tx_release(struct tty_struct *tty)
1285 {
1286         SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
1287         unsigned long flags;
1288
1289         if (sanity_check(info, tty->name, "tx_release"))
1290                 return;
1291
1292         if ( debug_level >= DEBUG_LEVEL_INFO )
1293                 printk("%s(%d):%s tx_release()\n",
1294                         __FILE__,__LINE__,info->device_name);
1295
1296         spin_lock_irqsave(&info->lock,flags);
1297         if (!info->tx_enabled)
1298                 tx_start(info);
1299         spin_unlock_irqrestore(&info->lock,flags);
1300 }
1301
1302 /* Service an IOCTL request
1303  *
1304  * Arguments:
1305  *
1306  *      tty     pointer to tty instance data
1307  *      file    pointer to associated file object for device
1308  *      cmd     IOCTL command code
1309  *      arg     command argument/context
1310  *
1311  * Return Value:        0 if success, otherwise error code
1312  */
1313 static int do_ioctl(struct tty_struct *tty, struct file *file,
1314                  unsigned int cmd, unsigned long arg)
1315 {
1316         SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
1317         int error;
1318         struct mgsl_icount cnow;        /* kernel counter temps */
1319         struct serial_icounter_struct __user *p_cuser;  /* user space */
1320         unsigned long flags;
1321         void __user *argp = (void __user *)arg;
1322
1323         if (debug_level >= DEBUG_LEVEL_INFO)
1324                 printk("%s(%d):%s ioctl() cmd=%08X\n", __FILE__,__LINE__,
1325                         info->device_name, cmd );
1326
1327         if (sanity_check(info, tty->name, "ioctl"))
1328                 return -ENODEV;
1329
1330         if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
1331             (cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT)) {
1332                 if (tty->flags & (1 << TTY_IO_ERROR))
1333                     return -EIO;
1334         }
1335
1336         switch (cmd) {
1337         case MGSL_IOCGPARAMS:
1338                 return get_params(info, argp);
1339         case MGSL_IOCSPARAMS:
1340                 return set_params(info, argp);
1341         case MGSL_IOCGTXIDLE:
1342                 return get_txidle(info, argp);
1343         case MGSL_IOCSTXIDLE:
1344                 return set_txidle(info, (int)arg);
1345         case MGSL_IOCTXENABLE:
1346                 return tx_enable(info, (int)arg);
1347         case MGSL_IOCRXENABLE:
1348                 return rx_enable(info, (int)arg);
1349         case MGSL_IOCTXABORT:
1350                 return tx_abort(info);
1351         case MGSL_IOCGSTATS:
1352                 return get_stats(info, argp);
1353         case MGSL_IOCWAITEVENT:
1354                 return wait_mgsl_event(info, argp);
1355         case MGSL_IOCLOOPTXDONE:
1356                 return 0; // TODO: Not supported, need to document
1357                 /* Wait for modem input (DCD,RI,DSR,CTS) change
1358                  * as specified by mask in arg (TIOCM_RNG/DSR/CD/CTS)
1359                  */
1360         case TIOCMIWAIT:
1361                 return modem_input_wait(info,(int)arg);
1362
1363                 /*
1364                  * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
1365                  * Return: write counters to the user passed counter struct
1366                  * NB: both 1->0 and 0->1 transitions are counted except for
1367                  *     RI where only 0->1 is counted.
1368                  */
1369         case TIOCGICOUNT:
1370                 spin_lock_irqsave(&info->lock,flags);
1371                 cnow = info->icount;
1372                 spin_unlock_irqrestore(&info->lock,flags);
1373                 p_cuser = argp;
1374                 PUT_USER(error,cnow.cts, &p_cuser->cts);
1375                 if (error) return error;
1376                 PUT_USER(error,cnow.dsr, &p_cuser->dsr);
1377                 if (error) return error;
1378                 PUT_USER(error,cnow.rng, &p_cuser->rng);
1379                 if (error) return error;
1380                 PUT_USER(error,cnow.dcd, &p_cuser->dcd);
1381                 if (error) return error;
1382                 PUT_USER(error,cnow.rx, &p_cuser->rx);
1383                 if (error) return error;
1384                 PUT_USER(error,cnow.tx, &p_cuser->tx);
1385                 if (error) return error;
1386                 PUT_USER(error,cnow.frame, &p_cuser->frame);
1387                 if (error) return error;
1388                 PUT_USER(error,cnow.overrun, &p_cuser->overrun);
1389                 if (error) return error;
1390                 PUT_USER(error,cnow.parity, &p_cuser->parity);
1391                 if (error) return error;
1392                 PUT_USER(error,cnow.brk, &p_cuser->brk);
1393                 if (error) return error;
1394                 PUT_USER(error,cnow.buf_overrun, &p_cuser->buf_overrun);
1395                 if (error) return error;
1396                 return 0;
1397         default:
1398                 return -ENOIOCTLCMD;
1399         }
1400         return 0;
1401 }
1402
1403 static int ioctl(struct tty_struct *tty, struct file *file,
1404                  unsigned int cmd, unsigned long arg)
1405 {
1406         int ret;
1407         lock_kernel();
1408         ret = do_ioctl(tty, file, cmd, arg);
1409         unlock_kernel();
1410         return ret;
1411 }
1412
1413 /*
1414  * /proc fs routines....
1415  */
1416
1417 static inline int line_info(char *buf, SLMP_INFO *info)
1418 {
1419         char    stat_buf[30];
1420         int     ret;
1421         unsigned long flags;
1422
1423         ret = sprintf(buf, "%s: SCABase=%08x Mem=%08X StatusControl=%08x LCR=%08X\n"
1424                        "\tIRQ=%d MaxFrameSize=%u\n",
1425                 info->device_name,
1426                 info->phys_sca_base,
1427                 info->phys_memory_base,
1428                 info->phys_statctrl_base,
1429                 info->phys_lcr_base,
1430                 info->irq_level,
1431                 info->max_frame_size );
1432
1433         /* output current serial signal states */
1434         spin_lock_irqsave(&info->lock,flags);
1435         get_signals(info);
1436         spin_unlock_irqrestore(&info->lock,flags);
1437
1438         stat_buf[0] = 0;
1439         stat_buf[1] = 0;
1440         if (info->serial_signals & SerialSignal_RTS)
1441                 strcat(stat_buf, "|RTS");
1442         if (info->serial_signals & SerialSignal_CTS)
1443                 strcat(stat_buf, "|CTS");
1444         if (info->serial_signals & SerialSignal_DTR)
1445                 strcat(stat_buf, "|DTR");
1446         if (info->serial_signals & SerialSignal_DSR)
1447                 strcat(stat_buf, "|DSR");
1448         if (info->serial_signals & SerialSignal_DCD)
1449                 strcat(stat_buf, "|CD");
1450         if (info->serial_signals & SerialSignal_RI)
1451                 strcat(stat_buf, "|RI");
1452
1453         if (info->params.mode == MGSL_MODE_HDLC) {
1454                 ret += sprintf(buf+ret, "\tHDLC txok:%d rxok:%d",
1455                               info->icount.txok, info->icount.rxok);
1456                 if (info->icount.txunder)
1457                         ret += sprintf(buf+ret, " txunder:%d", info->icount.txunder);
1458                 if (info->icount.txabort)
1459                         ret += sprintf(buf+ret, " txabort:%d", info->icount.txabort);
1460                 if (info->icount.rxshort)
1461                         ret += sprintf(buf+ret, " rxshort:%d", info->icount.rxshort);
1462                 if (info->icount.rxlong)
1463                         ret += sprintf(buf+ret, " rxlong:%d", info->icount.rxlong);
1464                 if (info->icount.rxover)
1465                         ret += sprintf(buf+ret, " rxover:%d", info->icount.rxover);
1466                 if (info->icount.rxcrc)
1467                         ret += sprintf(buf+ret, " rxlong:%d", info->icount.rxcrc);
1468         } else {
1469                 ret += sprintf(buf+ret, "\tASYNC tx:%d rx:%d",
1470                               info->icount.tx, info->icount.rx);
1471                 if (info->icount.frame)
1472                         ret += sprintf(buf+ret, " fe:%d", info->icount.frame);
1473                 if (info->icount.parity)
1474                         ret += sprintf(buf+ret, " pe:%d", info->icount.parity);
1475                 if (info->icount.brk)
1476                         ret += sprintf(buf+ret, " brk:%d", info->icount.brk);
1477                 if (info->icount.overrun)
1478                         ret += sprintf(buf+ret, " oe:%d", info->icount.overrun);
1479         }
1480
1481         /* Append serial signal status to end */
1482         ret += sprintf(buf+ret, " %s\n", stat_buf+1);
1483
1484         ret += sprintf(buf+ret, "\ttxactive=%d bh_req=%d bh_run=%d pending_bh=%x\n",
1485          info->tx_active,info->bh_requested,info->bh_running,
1486          info->pending_bh);
1487
1488         return ret;
1489 }
1490
1491 /* Called to print information about devices
1492  */
1493 static int read_proc(char *page, char **start, off_t off, int count,
1494               int *eof, void *data)
1495 {
1496         int len = 0, l;
1497         off_t   begin = 0;
1498         SLMP_INFO *info;
1499
1500         len += sprintf(page, "synclinkmp driver:%s\n", driver_version);
1501
1502         info = synclinkmp_device_list;
1503         while( info ) {
1504                 l = line_info(page + len, info);
1505                 len += l;
1506                 if (len+begin > off+count)
1507                         goto done;
1508                 if (len+begin < off) {
1509                         begin += len;
1510                         len = 0;
1511                 }
1512                 info = info->next_device;
1513         }
1514
1515         *eof = 1;
1516 done:
1517         if (off >= len+begin)
1518                 return 0;
1519         *start = page + (off-begin);
1520         return ((count < begin+len-off) ? count : begin+len-off);
1521 }
1522
1523 /* Return the count of bytes in transmit buffer
1524  */
1525 static int chars_in_buffer(struct tty_struct *tty)
1526 {
1527         SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
1528
1529         if (sanity_check(info, tty->name, "chars_in_buffer"))
1530                 return 0;
1531
1532         if (debug_level >= DEBUG_LEVEL_INFO)
1533                 printk("%s(%d):%s chars_in_buffer()=%d\n",
1534                        __FILE__, __LINE__, info->device_name, info->tx_count);
1535
1536         return info->tx_count;
1537 }
1538
1539 /* Signal remote device to throttle send data (our receive data)
1540  */
1541 static void throttle(struct tty_struct * tty)
1542 {
1543         SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
1544         unsigned long flags;
1545
1546         if (debug_level >= DEBUG_LEVEL_INFO)
1547                 printk("%s(%d):%s throttle() entry\n",
1548                          __FILE__,__LINE__, info->device_name );
1549
1550         if (sanity_check(info, tty->name, "throttle"))
1551                 return;
1552
1553         if (I_IXOFF(tty))
1554                 send_xchar(tty, STOP_CHAR(tty));
1555
1556         if (tty->termios->c_cflag & CRTSCTS) {
1557                 spin_lock_irqsave(&info->lock,flags);
1558                 info->serial_signals &= ~SerialSignal_RTS;
1559                 set_signals(info);
1560                 spin_unlock_irqrestore(&info->lock,flags);
1561         }
1562 }
1563
1564 /* Signal remote device to stop throttling send data (our receive data)
1565  */
1566 static void unthrottle(struct tty_struct * tty)
1567 {
1568         SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
1569         unsigned long flags;
1570
1571         if (debug_level >= DEBUG_LEVEL_INFO)
1572                 printk("%s(%d):%s unthrottle() entry\n",
1573                          __FILE__,__LINE__, info->device_name );
1574
1575         if (sanity_check(info, tty->name, "unthrottle"))
1576                 return;
1577
1578         if (I_IXOFF(tty)) {
1579                 if (info->x_char)
1580                         info->x_char = 0;
1581                 else
1582                         send_xchar(tty, START_CHAR(tty));
1583         }
1584
1585         if (tty->termios->c_cflag & CRTSCTS) {
1586                 spin_lock_irqsave(&info->lock,flags);
1587                 info->serial_signals |= SerialSignal_RTS;
1588                 set_signals(info);
1589                 spin_unlock_irqrestore(&info->lock,flags);
1590         }
1591 }
1592
1593 /* set or clear transmit break condition
1594  * break_state  -1=set break condition, 0=clear
1595  */
1596 static void set_break(struct tty_struct *tty, int break_state)
1597 {
1598         unsigned char RegValue;
1599         SLMP_INFO * info = (SLMP_INFO *)tty->driver_data;
1600         unsigned long flags;
1601
1602         if (debug_level >= DEBUG_LEVEL_INFO)
1603                 printk("%s(%d):%s set_break(%d)\n",
1604                          __FILE__,__LINE__, info->device_name, break_state);
1605
1606         if (sanity_check(info, tty->name, "set_break"))
1607                 return;
1608
1609         spin_lock_irqsave(&info->lock,flags);
1610         RegValue = read_reg(info, CTL);
1611         if (break_state == -1)
1612                 RegValue |= BIT3;
1613         else
1614                 RegValue &= ~BIT3;
1615         write_reg(info, CTL, RegValue);
1616         spin_unlock_irqrestore(&info->lock,flags);
1617 }
1618
1619 #if SYNCLINK_GENERIC_HDLC
1620
1621 /**
1622  * called by generic HDLC layer when protocol selected (PPP, frame relay, etc.)
1623  * set encoding and frame check sequence (FCS) options
1624  *
1625  * dev       pointer to network device structure
1626  * encoding  serial encoding setting
1627  * parity    FCS setting
1628  *
1629  * returns 0 if success, otherwise error code
1630  */
1631 static int hdlcdev_attach(struct net_device *dev, unsigned short encoding,
1632                           unsigned short parity)
1633 {
1634         SLMP_INFO *info = dev_to_port(dev);
1635         unsigned char  new_encoding;
1636         unsigned short new_crctype;
1637
1638         /* return error if TTY interface open */
1639         if (info->count)
1640                 return -EBUSY;
1641
1642         switch (encoding)
1643         {
1644         case ENCODING_NRZ:        new_encoding = HDLC_ENCODING_NRZ; break;
1645         case ENCODING_NRZI:       new_encoding = HDLC_ENCODING_NRZI_SPACE; break;
1646         case ENCODING_FM_MARK:    new_encoding = HDLC_ENCODING_BIPHASE_MARK; break;
1647         case ENCODING_FM_SPACE:   new_encoding = HDLC_ENCODING_BIPHASE_SPACE; break;
1648         case ENCODING_MANCHESTER: new_encoding = HDLC_ENCODING_BIPHASE_LEVEL; break;
1649         default: return -EINVAL;
1650         }
1651
1652         switch (parity)
1653         {
1654         case PARITY_NONE:            new_crctype = HDLC_CRC_NONE; break;
1655         case PARITY_CRC16_PR1_CCITT: new_crctype = HDLC_CRC_16_CCITT; break;
1656         case PARITY_CRC32_PR1_CCITT: new_crctype = HDLC_CRC_32_CCITT; break;
1657         default: return -EINVAL;
1658         }
1659
1660         info->params.encoding = new_encoding;
1661         info->params.crc_type = new_crctype;
1662
1663         /* if network interface up, reprogram hardware */
1664         if (info->netcount)
1665                 program_hw(info);
1666
1667         return 0;
1668 }
1669
1670 /**
1671  * called by generic HDLC layer to send frame
1672  *
1673  * skb  socket buffer containing HDLC frame
1674  * dev  pointer to network device structure
1675  *
1676  * returns 0 if success, otherwise error code
1677  */
1678 static int hdlcdev_xmit(struct sk_buff *skb, struct net_device *dev)
1679 {
1680         SLMP_INFO *info = dev_to_port(dev);
1681         struct net_device_stats *stats = hdlc_stats(dev);
1682         unsigned long flags;
1683
1684         if (debug_level >= DEBUG_LEVEL_INFO)
1685                 printk(KERN_INFO "%s:hdlc_xmit(%s)\n",__FILE__,dev->name);
1686
1687         /* stop sending until this frame completes */
1688         netif_stop_queue(dev);
1689
1690         /* copy data to device buffers */
1691         info->tx_count = skb->len;
1692         tx_load_dma_buffer(info, skb->data, skb->len);
1693
1694         /* update network statistics */
1695         stats->tx_packets++;
1696         stats->tx_bytes += skb->len;
1697
1698         /* done with socket buffer, so free it */
1699         dev_kfree_skb(skb);
1700
1701         /* save start time for transmit timeout detection */
1702         dev->trans_start = jiffies;
1703
1704         /* start hardware transmitter if necessary */
1705         spin_lock_irqsave(&info->lock,flags);
1706         if (!info->tx_active)
1707                 tx_start(info);
1708         spin_unlock_irqrestore(&info->lock,flags);
1709
1710         return 0;
1711 }
1712
1713 /**
1714  * called by network layer when interface enabled
1715  * claim resources and initialize hardware
1716  *
1717  * dev  pointer to network device structure
1718  *
1719  * returns 0 if success, otherwise error code
1720  */
1721 static int hdlcdev_open(struct net_device *dev)
1722 {
1723         SLMP_INFO *info = dev_to_port(dev);
1724         int rc;
1725         unsigned long flags;
1726
1727         if (debug_level >= DEBUG_LEVEL_INFO)
1728                 printk("%s:hdlcdev_open(%s)\n",__FILE__,dev->name);
1729
1730         /* generic HDLC layer open processing */
1731         if ((rc = hdlc_open(dev)))
1732                 return rc;
1733
1734         /* arbitrate between network and tty opens */
1735         spin_lock_irqsave(&info->netlock, flags);
1736         if (info->count != 0 || info->netcount != 0) {
1737                 printk(KERN_WARNING "%s: hdlc_open returning busy\n", dev->name);
1738                 spin_unlock_irqrestore(&info->netlock, flags);
1739                 return -EBUSY;
1740         }
1741         info->netcount=1;
1742         spin_unlock_irqrestore(&info->netlock, flags);
1743
1744         /* claim resources and init adapter */
1745         if ((rc = startup(info)) != 0) {
1746                 spin_lock_irqsave(&info->netlock, flags);
1747                 info->netcount=0;
1748                 spin_unlock_irqrestore(&info->netlock, flags);
1749                 return rc;
1750         }
1751
1752         /* assert DTR and RTS, apply hardware settings */
1753         info->serial_signals |= SerialSignal_RTS + SerialSignal_DTR;
1754         program_hw(info);
1755
1756         /* enable network layer transmit */
1757         dev->trans_start = jiffies;
1758         netif_start_queue(dev);
1759
1760         /* inform generic HDLC layer of current DCD status */
1761         spin_lock_irqsave(&info->lock, flags);
1762         get_signals(info);
1763         spin_unlock_irqrestore(&info->lock, flags);
1764         if (info->serial_signals & SerialSignal_DCD)
1765                 netif_carrier_on(dev);
1766         else
1767                 netif_carrier_off(dev);
1768         return 0;
1769 }
1770
1771 /**
1772  * called by network layer when interface is disabled
1773  * shutdown hardware and release resources
1774  *
1775  * dev  pointer to network device structure
1776  *
1777  * returns 0 if success, otherwise error code
1778  */
1779 static int hdlcdev_close(struct net_device *dev)
1780 {
1781         SLMP_INFO *info = dev_to_port(dev);
1782         unsigned long flags;
1783
1784         if (debug_level >= DEBUG_LEVEL_INFO)
1785                 printk("%s:hdlcdev_close(%s)\n",__FILE__,dev->name);
1786
1787         netif_stop_queue(dev);
1788
1789         /* shutdown adapter and release resources */
1790         shutdown(info);
1791
1792         hdlc_close(dev);
1793
1794         spin_lock_irqsave(&info->netlock, flags);
1795         info->netcount=0;
1796         spin_unlock_irqrestore(&info->netlock, flags);
1797
1798         return 0;
1799 }
1800
1801 /**
1802  * called by network layer to process IOCTL call to network device
1803  *
1804  * dev  pointer to network device structure
1805  * ifr  pointer to network interface request structure
1806  * cmd  IOCTL command code
1807  *
1808  * returns 0 if success, otherwise error code
1809  */
1810 static int hdlcdev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
1811 {
1812         const size_t size = sizeof(sync_serial_settings);
1813         sync_serial_settings new_line;
1814         sync_serial_settings __user *line = ifr->ifr_settings.ifs_ifsu.sync;
1815         SLMP_INFO *info = dev_to_port(dev);
1816         unsigned int flags;
1817
1818         if (debug_level >= DEBUG_LEVEL_INFO)
1819                 printk("%s:hdlcdev_ioctl(%s)\n",__FILE__,dev->name);
1820
1821         /* return error if TTY interface open */
1822         if (info->count)
1823                 return -EBUSY;
1824
1825         if (cmd != SIOCWANDEV)
1826                 return hdlc_ioctl(dev, ifr, cmd);
1827
1828         switch(ifr->ifr_settings.type) {
1829         case IF_GET_IFACE: /* return current sync_serial_settings */
1830
1831                 ifr->ifr_settings.type = IF_IFACE_SYNC_SERIAL;
1832                 if (ifr->ifr_settings.size < size) {
1833                         ifr->ifr_settings.size = size; /* data size wanted */
1834                         return -ENOBUFS;
1835                 }
1836
1837                 flags = info->params.flags & (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
1838                                               HDLC_FLAG_RXC_BRG    | HDLC_FLAG_RXC_TXCPIN |
1839                                               HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
1840                                               HDLC_FLAG_TXC_BRG    | HDLC_FLAG_TXC_RXCPIN);
1841
1842                 switch (flags){
1843                 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN): new_line.clock_type = CLOCK_EXT; break;
1844                 case (HDLC_FLAG_RXC_BRG    | HDLC_FLAG_TXC_BRG):    new_line.clock_type = CLOCK_INT; break;
1845                 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG):    new_line.clock_type = CLOCK_TXINT; break;
1846                 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN): new_line.clock_type = CLOCK_TXFROMRX; break;
1847                 default: new_line.clock_type = CLOCK_DEFAULT;
1848                 }
1849
1850                 new_line.clock_rate = info->params.clock_speed;
1851                 new_line.loopback   = info->params.loopback ? 1:0;
1852
1853                 if (copy_to_user(line, &new_line, size))
1854                         return -EFAULT;
1855                 return 0;
1856
1857         case IF_IFACE_SYNC_SERIAL: /* set sync_serial_settings */
1858
1859                 if(!capable(CAP_NET_ADMIN))
1860                         return -EPERM;
1861                 if (copy_from_user(&new_line, line, size))
1862                         return -EFAULT;
1863
1864                 switch (new_line.clock_type)
1865                 {
1866                 case CLOCK_EXT:      flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN; break;
1867                 case CLOCK_TXFROMRX: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN; break;
1868                 case CLOCK_INT:      flags = HDLC_FLAG_RXC_BRG    | HDLC_FLAG_TXC_BRG;    break;
1869                 case CLOCK_TXINT:    flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG;    break;
1870                 case CLOCK_DEFAULT:  flags = info->params.flags &
1871                                              (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
1872                                               HDLC_FLAG_RXC_BRG    | HDLC_FLAG_RXC_TXCPIN |
1873                                               HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
1874                                               HDLC_FLAG_TXC_BRG    | HDLC_FLAG_TXC_RXCPIN); break;
1875                 default: return -EINVAL;
1876                 }
1877
1878                 if (new_line.loopback != 0 && new_line.loopback != 1)
1879                         return -EINVAL;
1880
1881                 info->params.flags &= ~(HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
1882                                         HDLC_FLAG_RXC_BRG    | HDLC_FLAG_RXC_TXCPIN |
1883                                         HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
1884                                         HDLC_FLAG_TXC_BRG    | HDLC_FLAG_TXC_RXCPIN);
1885                 info->params.flags |= flags;
1886
1887                 info->params.loopback = new_line.loopback;
1888
1889                 if (flags & (HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG))
1890                         info->params.clock_speed = new_line.clock_rate;
1891                 else
1892                         info->params.clock_speed = 0;
1893
1894                 /* if network interface up, reprogram hardware */
1895                 if (info->netcount)
1896                         program_hw(info);
1897                 return 0;
1898
1899         default:
1900                 return hdlc_ioctl(dev, ifr, cmd);
1901         }
1902 }
1903
1904 /**
1905  * called by network layer when transmit timeout is detected
1906  *
1907  * dev  pointer to network device structure
1908  */
1909 static void hdlcdev_tx_timeout(struct net_device *dev)
1910 {
1911         SLMP_INFO *info = dev_to_port(dev);
1912         struct net_device_stats *stats = hdlc_stats(dev);
1913         unsigned long flags;
1914
1915         if (debug_level >= DEBUG_LEVEL_INFO)
1916                 printk("hdlcdev_tx_timeout(%s)\n",dev->name);
1917
1918         stats->tx_errors++;
1919         stats->tx_aborted_errors++;
1920
1921         spin_lock_irqsave(&info->lock,flags);
1922         tx_stop(info);
1923         spin_unlock_irqrestore(&info->lock,flags);
1924
1925         netif_wake_queue(dev);
1926 }
1927
1928 /**
1929  * called by device driver when transmit completes
1930  * reenable network layer transmit if stopped
1931  *
1932  * info  pointer to device instance information
1933  */
1934 static void hdlcdev_tx_done(SLMP_INFO *info)
1935 {
1936         if (netif_queue_stopped(info->netdev))
1937                 netif_wake_queue(info->netdev);
1938 }
1939
1940 /**
1941  * called by device driver when frame received
1942  * pass frame to network layer
1943  *
1944  * info  pointer to device instance information
1945  * buf   pointer to buffer contianing frame data
1946  * size  count of data bytes in buf
1947  */
1948 static void hdlcdev_rx(SLMP_INFO *info, char *buf, int size)
1949 {
1950         struct sk_buff *skb = dev_alloc_skb(size);
1951         struct net_device *dev = info->netdev;
1952         struct net_device_stats *stats = hdlc_stats(dev);
1953
1954         if (debug_level >= DEBUG_LEVEL_INFO)
1955                 printk("hdlcdev_rx(%s)\n",dev->name);
1956
1957         if (skb == NULL) {
1958                 printk(KERN_NOTICE "%s: can't alloc skb, dropping packet\n", dev->name);
1959                 stats->rx_dropped++;
1960                 return;
1961         }
1962
1963         memcpy(skb_put(skb, size),buf,size);
1964
1965         skb->protocol = hdlc_type_trans(skb, info->netdev);
1966
1967         stats->rx_packets++;
1968         stats->rx_bytes += size;
1969
1970         netif_rx(skb);
1971
1972         info->netdev->last_rx = jiffies;
1973 }
1974
1975 /**
1976  * called by device driver when adding device instance
1977  * do generic HDLC initialization
1978  *
1979  * info  pointer to device instance information
1980  *
1981  * returns 0 if success, otherwise error code
1982  */
1983 static int hdlcdev_init(SLMP_INFO *info)
1984 {
1985         int rc;
1986         struct net_device *dev;
1987         hdlc_device *hdlc;
1988
1989         /* allocate and initialize network and HDLC layer objects */
1990
1991         if (!(dev = alloc_hdlcdev(info))) {
1992                 printk(KERN_ERR "%s:hdlc device allocation failure\n",__FILE__);
1993                 return -ENOMEM;
1994         }
1995
1996         /* for network layer reporting purposes only */
1997         dev->mem_start = info->phys_sca_base;
1998         dev->mem_end   = info->phys_sca_base + SCA_BASE_SIZE - 1;
1999         dev->irq       = info->irq_level;
2000
2001         /* network layer callbacks and settings */
2002         dev->do_ioctl       = hdlcdev_ioctl;
2003         dev->open           = hdlcdev_open;
2004         dev->stop           = hdlcdev_close;
2005         dev->tx_timeout     = hdlcdev_tx_timeout;
2006         dev->watchdog_timeo = 10*HZ;
2007         dev->tx_queue_len   = 50;
2008
2009         /* generic HDLC layer callbacks and settings */
2010         hdlc         = dev_to_hdlc(dev);
2011         hdlc->attach = hdlcdev_attach;
2012         hdlc->xmit   = hdlcdev_xmit;
2013
2014         /* register objects with HDLC layer */
2015         if ((rc = register_hdlc_device(dev))) {
2016                 printk(KERN_WARNING "%s:unable to register hdlc device\n",__FILE__);
2017                 free_netdev(dev);
2018                 return rc;
2019         }
2020
2021         info->netdev = dev;
2022         return 0;
2023 }
2024
2025 /**
2026  * called by device driver when removing device instance
2027  * do generic HDLC cleanup
2028  *
2029  * info  pointer to device instance information
2030  */
2031 static void hdlcdev_exit(SLMP_INFO *info)
2032 {
2033         unregister_hdlc_device(info->netdev);
2034         free_netdev(info->netdev);
2035         info->netdev = NULL;
2036 }
2037
2038 #endif /* CONFIG_HDLC */
2039
2040
2041 /* Return next bottom half action to perform.
2042  * Return Value:        BH action code or 0 if nothing to do.
2043  */
2044 static int bh_action(SLMP_INFO *info)
2045 {
2046         unsigned long flags;
2047         int rc = 0;
2048
2049         spin_lock_irqsave(&info->lock,flags);
2050
2051         if (info->pending_bh & BH_RECEIVE) {
2052                 info->pending_bh &= ~BH_RECEIVE;
2053                 rc = BH_RECEIVE;
2054         } else if (info->pending_bh & BH_TRANSMIT) {
2055                 info->pending_bh &= ~BH_TRANSMIT;
2056                 rc = BH_TRANSMIT;
2057         } else if (info->pending_bh & BH_STATUS) {
2058                 info->pending_bh &= ~BH_STATUS;
2059                 rc = BH_STATUS;
2060         }
2061
2062         if (!rc) {
2063                 /* Mark BH routine as complete */
2064                 info->bh_running = false;
2065                 info->bh_requested = false;
2066         }
2067
2068         spin_unlock_irqrestore(&info->lock,flags);
2069
2070         return rc;
2071 }
2072
2073 /* Perform bottom half processing of work items queued by ISR.
2074  */
2075 static void bh_handler(struct work_struct *work)
2076 {
2077         SLMP_INFO *info = container_of(work, SLMP_INFO, task);
2078         int action;
2079
2080         if (!info)
2081                 return;
2082
2083         if ( debug_level >= DEBUG_LEVEL_BH )
2084                 printk( "%s(%d):%s bh_handler() entry\n",
2085                         __FILE__,__LINE__,info->device_name);
2086
2087         info->bh_running = true;
2088
2089         while((action = bh_action(info)) != 0) {
2090
2091                 /* Process work item */
2092                 if ( debug_level >= DEBUG_LEVEL_BH )
2093                         printk( "%s(%d):%s bh_handler() work item action=%d\n",
2094                                 __FILE__,__LINE__,info->device_name, action);
2095
2096                 switch (action) {
2097
2098                 case BH_RECEIVE:
2099                         bh_receive(info);
2100                         break;
2101                 case BH_TRANSMIT:
2102                         bh_transmit(info);
2103                         break;
2104                 case BH_STATUS:
2105                         bh_status(info);
2106                         break;
2107                 default:
2108                         /* unknown work item ID */
2109                         printk("%s(%d):%s Unknown work item ID=%08X!\n",
2110                                 __FILE__,__LINE__,info->device_name,action);
2111                         break;
2112                 }
2113         }
2114
2115         if ( debug_level >= DEBUG_LEVEL_BH )
2116                 printk( "%s(%d):%s bh_handler() exit\n",
2117                         __FILE__,__LINE__,info->device_name);
2118 }
2119
2120 static void bh_receive(SLMP_INFO *info)
2121 {
2122         if ( debug_level >= DEBUG_LEVEL_BH )
2123                 printk( "%s(%d):%s bh_receive()\n",
2124                         __FILE__,__LINE__,info->device_name);
2125
2126         while( rx_get_frame(info) );
2127 }
2128
2129 static void bh_transmit(SLMP_INFO *info)
2130 {
2131         struct tty_struct *tty = info->tty;
2132
2133         if ( debug_level >= DEBUG_LEVEL_BH )
2134                 printk( "%s(%d):%s bh_transmit() entry\n",
2135                         __FILE__,__LINE__,info->device_name);
2136
2137         if (tty)
2138                 tty_wakeup(tty);
2139 }
2140
2141 static void bh_status(SLMP_INFO *info)
2142 {
2143         if ( debug_level >= DEBUG_LEVEL_BH )
2144                 printk( "%s(%d):%s bh_status() entry\n",
2145                         __FILE__,__LINE__,info->device_name);
2146
2147         info->ri_chkcount = 0;
2148         info->dsr_chkcount = 0;
2149         info->dcd_chkcount = 0;
2150         info->cts_chkcount = 0;
2151 }
2152
2153 static void isr_timer(SLMP_INFO * info)
2154 {
2155         unsigned char timer = (info->port_num & 1) ? TIMER2 : TIMER0;
2156
2157         /* IER2<7..4> = timer<3..0> interrupt enables (0=disabled) */
2158         write_reg(info, IER2, 0);
2159
2160         /* TMCS, Timer Control/Status Register
2161          *
2162          * 07      CMF, Compare match flag (read only) 1=match
2163          * 06      ECMI, CMF Interrupt Enable: 0=disabled
2164          * 05      Reserved, must be 0
2165          * 04      TME, Timer Enable
2166          * 03..00  Reserved, must be 0
2167          *
2168          * 0000 0000
2169          */
2170         write_reg(info, (unsigned char)(timer + TMCS), 0);
2171
2172         info->irq_occurred = true;
2173
2174         if ( debug_level >= DEBUG_LEVEL_ISR )
2175                 printk("%s(%d):%s isr_timer()\n",
2176                         __FILE__,__LINE__,info->device_name);
2177 }
2178
2179 static void isr_rxint(SLMP_INFO * info)
2180 {
2181         struct tty_struct *tty = info->tty;
2182         struct  mgsl_icount *icount = &info->icount;
2183         unsigned char status = read_reg(info, SR1) & info->ie1_value & (FLGD + IDLD + CDCD + BRKD);
2184         unsigned char status2 = read_reg(info, SR2) & info->ie2_value & OVRN;
2185
2186         /* clear status bits */
2187         if (status)
2188                 write_reg(info, SR1, status);
2189
2190         if (status2)
2191                 write_reg(info, SR2, status2);
2192
2193         if ( debug_level >= DEBUG_LEVEL_ISR )
2194                 printk("%s(%d):%s isr_rxint status=%02X %02x\n",
2195                         __FILE__,__LINE__,info->device_name,status,status2);
2196
2197         if (info->params.mode == MGSL_MODE_ASYNC) {
2198                 if (status & BRKD) {
2199                         icount->brk++;
2200
2201                         /* process break detection if tty control
2202                          * is not set to ignore it
2203                          */
2204                         if ( tty ) {
2205                                 if (!(status & info->ignore_status_mask1)) {
2206                                         if (info->read_status_mask1 & BRKD) {
2207                                                 tty_insert_flip_char(tty, 0, TTY_BREAK);
2208                                                 if (info->flags & ASYNC_SAK)
2209                                                         do_SAK(tty);
2210                                         }
2211                                 }
2212                         }
2213                 }
2214         }
2215         else {
2216                 if (status & (FLGD|IDLD)) {
2217                         if (status & FLGD)
2218                                 info->icount.exithunt++;
2219                         else if (status & IDLD)
2220                                 info->icount.rxidle++;
2221                         wake_up_interruptible(&info->event_wait_q);
2222                 }
2223         }
2224
2225         if (status & CDCD) {
2226                 /* simulate a common modem status change interrupt
2227                  * for our handler
2228                  */
2229                 get_signals( info );
2230                 isr_io_pin(info,
2231                         MISCSTATUS_DCD_LATCHED|(info->serial_signals&SerialSignal_DCD));
2232         }
2233 }
2234
2235 /*
2236  * handle async rx data interrupts
2237  */
2238 static void isr_rxrdy(SLMP_INFO * info)
2239 {
2240         u16 status;
2241         unsigned char DataByte;
2242         struct tty_struct *tty = info->tty;
2243         struct  mgsl_icount *icount = &info->icount;
2244
2245         if ( debug_level >= DEBUG_LEVEL_ISR )
2246                 printk("%s(%d):%s isr_rxrdy\n",
2247                         __FILE__,__LINE__,info->device_name);
2248
2249         while((status = read_reg(info,CST0)) & BIT0)
2250         {
2251                 int flag = 0;
2252                 bool over = false;
2253                 DataByte = read_reg(info,TRB);
2254
2255                 icount->rx++;
2256
2257                 if ( status & (PE + FRME + OVRN) ) {
2258                         printk("%s(%d):%s rxerr=%04X\n",
2259                                 __FILE__,__LINE__,info->device_name,status);
2260
2261                         /* update error statistics */
2262                         if (status & PE)
2263                                 icount->parity++;
2264                         else if (status & FRME)
2265                                 icount->frame++;
2266                         else if (status & OVRN)
2267                                 icount->overrun++;
2268
2269                         /* discard char if tty control flags say so */
2270                         if (status & info->ignore_status_mask2)
2271                                 continue;
2272
2273                         status &= info->read_status_mask2;
2274
2275                         if ( tty ) {
2276                                 if (status & PE)
2277                                         flag = TTY_PARITY;
2278                                 else if (status & FRME)
2279                                         flag = TTY_FRAME;
2280                                 if (status & OVRN) {
2281                                         /* Overrun is special, since it's
2282                                          * reported immediately, and doesn't
2283                                          * affect the current character
2284                                          */
2285                                         over = true;
2286                                 }
2287                         }
2288                 }       /* end of if (error) */
2289
2290                 if ( tty ) {
2291                         tty_insert_flip_char(tty, DataByte, flag);
2292                         if (over)
2293                                 tty_insert_flip_char(tty, 0, TTY_OVERRUN);
2294                 }
2295         }
2296
2297         if ( debug_level >= DEBUG_LEVEL_ISR ) {
2298                 printk("%s(%d):%s rx=%d brk=%d parity=%d frame=%d overrun=%d\n",
2299                         __FILE__,__LINE__,info->device_name,
2300                         icount->rx,icount->brk,icount->parity,
2301                         icount->frame,icount->overrun);
2302         }
2303
2304         if ( tty )
2305                 tty_flip_buffer_push(tty);
2306 }
2307
2308 static void isr_txeom(SLMP_INFO * info, unsigned char status)
2309 {
2310         if ( debug_level >= DEBUG_LEVEL_ISR )
2311                 printk("%s(%d):%s isr_txeom status=%02x\n",
2312                         __FILE__,__LINE__,info->device_name,status);
2313
2314         write_reg(info, TXDMA + DIR, 0x00); /* disable Tx DMA IRQs */
2315         write_reg(info, TXDMA + DSR, 0xc0); /* clear IRQs and disable DMA */
2316         write_reg(info, TXDMA + DCMD, SWABORT); /* reset/init DMA channel */
2317
2318         if (status & UDRN) {
2319                 write_reg(info, CMD, TXRESET);
2320                 write_reg(info, CMD, TXENABLE);
2321         } else
2322                 write_reg(info, CMD, TXBUFCLR);
2323
2324         /* disable and clear tx interrupts */
2325         info->ie0_value &= ~TXRDYE;
2326         info->ie1_value &= ~(IDLE + UDRN);
2327         write_reg16(info, IE0, (unsigned short)((info->ie1_value << 8) + info->ie0_value));
2328         write_reg(info, SR1, (unsigned char)(UDRN + IDLE));
2329
2330         if ( info->tx_active ) {
2331                 if (info->params.mode != MGSL_MODE_ASYNC) {
2332                         if (status & UDRN)
2333                                 info->icount.txunder++;
2334                         else if (status & IDLE)
2335                                 info->icount.txok++;
2336                 }
2337
2338                 info->tx_active = false;
2339                 info->tx_count = info->tx_put = info->tx_get = 0;
2340
2341                 del_timer(&info->tx_timer);
2342
2343                 if (info->params.mode != MGSL_MODE_ASYNC && info->drop_rts_on_tx_done ) {
2344                         info->serial_signals &= ~SerialSignal_RTS;
2345                         info->drop_rts_on_tx_done = false;
2346                         set_signals(info);
2347                 }
2348
2349 #if SYNCLINK_GENERIC_HDLC
2350                 if (info->netcount)
2351                         hdlcdev_tx_done(info);
2352                 else
2353 #endif
2354                 {
2355                         if (info->tty && (info->tty->stopped || info->tty->hw_stopped)) {
2356                                 tx_stop(info);
2357                                 return;
2358                         }
2359                         info->pending_bh |= BH_TRANSMIT;
2360                 }
2361         }
2362 }
2363
2364
2365 /*
2366  * handle tx status interrupts
2367  */
2368 static void isr_txint(SLMP_INFO * info)
2369 {
2370         unsigned char status = read_reg(info, SR1) & info->ie1_value & (UDRN + IDLE + CCTS);
2371
2372         /* clear status bits */
2373         write_reg(info, SR1, status);
2374
2375         if ( debug_level >= DEBUG_LEVEL_ISR )
2376                 printk("%s(%d):%s isr_txint status=%02x\n",
2377                         __FILE__,__LINE__,info->device_name,status);
2378
2379         if (status & (UDRN + IDLE))
2380                 isr_txeom(info, status);
2381
2382         if (status & CCTS) {
2383                 /* simulate a common modem status change interrupt
2384                  * for our handler
2385                  */
2386                 get_signals( info );
2387                 isr_io_pin(info,
2388                         MISCSTATUS_CTS_LATCHED|(info->serial_signals&SerialSignal_CTS));
2389
2390         }
2391 }
2392
2393 /*
2394  * handle async tx data interrupts
2395  */
2396 static void isr_txrdy(SLMP_INFO * info)
2397 {
2398         if ( debug_level >= DEBUG_LEVEL_ISR )
2399                 printk("%s(%d):%s isr_txrdy() tx_count=%d\n",
2400                         __FILE__,__LINE__,info->device_name,info->tx_count);
2401
2402         if (info->params.mode != MGSL_MODE_ASYNC) {
2403                 /* disable TXRDY IRQ, enable IDLE IRQ */
2404                 info->ie0_value &= ~TXRDYE;
2405                 info->ie1_value |= IDLE;
2406                 write_reg16(info, IE0, (unsigned short)((info->ie1_value << 8) + info->ie0_value));
2407                 return;
2408         }
2409
2410         if (info->tty && (info->tty->stopped || info->tty->hw_stopped)) {
2411                 tx_stop(info);
2412                 return;
2413         }
2414
2415         if ( info->tx_count )
2416                 tx_load_fifo( info );
2417         else {
2418                 info->tx_active = false;
2419                 info->ie0_value &= ~TXRDYE;
2420                 write_reg(info, IE0, info->ie0_value);
2421         }
2422
2423         if (info->tx_count < WAKEUP_CHARS)
2424                 info->pending_bh |= BH_TRANSMIT;
2425 }
2426
2427 static void isr_rxdmaok(SLMP_INFO * info)
2428 {
2429         /* BIT7 = EOT (end of transfer)
2430          * BIT6 = EOM (end of message/frame)
2431          */
2432         unsigned char status = read_reg(info,RXDMA + DSR) & 0xc0;
2433
2434         /* clear IRQ (BIT0 must be 1 to prevent clearing DE bit) */
2435         write_reg(info, RXDMA + DSR, (unsigned char)(status | 1));
2436
2437         if ( debug_level >= DEBUG_LEVEL_ISR )
2438                 printk("%s(%d):%s isr_rxdmaok(), status=%02x\n",
2439                         __FILE__,__LINE__,info->device_name,status);
2440
2441         info->pending_bh |= BH_RECEIVE;
2442 }
2443
2444 static void isr_rxdmaerror(SLMP_INFO * info)
2445 {
2446         /* BIT5 = BOF (buffer overflow)
2447          * BIT4 = COF (counter overflow)
2448          */
2449         unsigned char status = read_reg(info,RXDMA + DSR) & 0x30;
2450
2451         /* clear IRQ (BIT0 must be 1 to prevent clearing DE bit) */
2452         write_reg(info, RXDMA + DSR, (unsigned char)(status | 1));
2453
2454         if ( debug_level >= DEBUG_LEVEL_ISR )
2455                 printk("%s(%d):%s isr_rxdmaerror(), status=%02x\n",
2456                         __FILE__,__LINE__,info->device_name,status);
2457
2458         info->rx_overflow = true;
2459         info->pending_bh |= BH_RECEIVE;
2460 }
2461
2462 static void isr_txdmaok(SLMP_INFO * info)
2463 {
2464         unsigned char status_reg1 = read_reg(info, SR1);
2465
2466         write_reg(info, TXDMA + DIR, 0x00);     /* disable Tx DMA IRQs */
2467         write_reg(info, TXDMA + DSR, 0xc0); /* clear IRQs and disable DMA */
2468         write_reg(info, TXDMA + DCMD, SWABORT); /* reset/init DMA channel */
2469
2470         if ( debug_level >= DEBUG_LEVEL_ISR )
2471                 printk("%s(%d):%s isr_txdmaok(), status=%02x\n",
2472                         __FILE__,__LINE__,info->device_name,status_reg1);
2473
2474         /* program TXRDY as FIFO empty flag, enable TXRDY IRQ */
2475         write_reg16(info, TRC0, 0);
2476         info->ie0_value |= TXRDYE;
2477         write_reg(info, IE0, info->ie0_value);
2478 }
2479
2480 static void isr_txdmaerror(SLMP_INFO * info)
2481 {
2482         /* BIT5 = BOF (buffer overflow)
2483          * BIT4 = COF (counter overflow)
2484          */
2485         unsigned char status = read_reg(info,TXDMA + DSR) & 0x30;
2486
2487         /* clear IRQ (BIT0 must be 1 to prevent clearing DE bit) */
2488         write_reg(info, TXDMA + DSR, (unsigned char)(status | 1));
2489
2490         if ( debug_level >= DEBUG_LEVEL_ISR )
2491                 printk("%s(%d):%s isr_txdmaerror(), status=%02x\n",
2492                         __FILE__,__LINE__,info->device_name,status);
2493 }
2494
2495 /* handle input serial signal changes
2496  */
2497 static void isr_io_pin( SLMP_INFO *info, u16 status )
2498 {
2499         struct  mgsl_icount *icount;
2500
2501         if ( debug_level >= DEBUG_LEVEL_ISR )
2502                 printk("%s(%d):isr_io_pin status=%04X\n",
2503                         __FILE__,__LINE__,status);
2504
2505         if (status & (MISCSTATUS_CTS_LATCHED | MISCSTATUS_DCD_LATCHED |
2506                       MISCSTATUS_DSR_LATCHED | MISCSTATUS_RI_LATCHED) ) {
2507                 icount = &info->icount;
2508                 /* update input line counters */
2509                 if (status & MISCSTATUS_RI_LATCHED) {
2510                         icount->rng++;
2511                         if ( status & SerialSignal_RI )
2512                                 info->input_signal_events.ri_up++;
2513                         else
2514                                 info->input_signal_events.ri_down++;
2515                 }
2516                 if (status & MISCSTATUS_DSR_LATCHED) {
2517                         icount->dsr++;
2518                         if ( status & SerialSignal_DSR )
2519                                 info->input_signal_events.dsr_up++;
2520                         else
2521                                 info->input_signal_events.dsr_down++;
2522                 }
2523                 if (status & MISCSTATUS_DCD_LATCHED) {
2524                         if ((info->dcd_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT) {
2525                                 info->ie1_value &= ~CDCD;
2526                                 write_reg(info, IE1, info->ie1_value);
2527                         }
2528                         icount->dcd++;
2529                         if (status & SerialSignal_DCD) {
2530                                 info->input_signal_events.dcd_up++;
2531                         } else
2532                                 info->input_signal_events.dcd_down++;
2533 #if SYNCLINK_GENERIC_HDLC
2534                         if (info->netcount) {
2535                                 if (status & SerialSignal_DCD)
2536                                         netif_carrier_on(info->netdev);
2537                                 else
2538                                         netif_carrier_off(info->netdev);
2539                         }
2540 #endif
2541                 }
2542                 if (status & MISCSTATUS_CTS_LATCHED)
2543                 {
2544                         if ((info->cts_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT) {
2545                                 info->ie1_value &= ~CCTS;
2546                                 write_reg(info, IE1, info->ie1_value);
2547                         }
2548                         icount->cts++;
2549                         if ( status & SerialSignal_CTS )
2550                                 info->input_signal_events.cts_up++;
2551                         else
2552                                 info->input_signal_events.cts_down++;
2553                 }
2554                 wake_up_interruptible(&info->status_event_wait_q);
2555                 wake_up_interruptible(&info->event_wait_q);
2556
2557                 if ( (info->flags & ASYNC_CHECK_CD) &&
2558                      (status & MISCSTATUS_DCD_LATCHED) ) {
2559                         if ( debug_level >= DEBUG_LEVEL_ISR )
2560                                 printk("%s CD now %s...", info->device_name,
2561                                        (status & SerialSignal_DCD) ? "on" : "off");
2562                         if (status & SerialSignal_DCD)
2563                                 wake_up_interruptible(&info->open_wait);
2564                         else {
2565                                 if ( debug_level >= DEBUG_LEVEL_ISR )
2566                                         printk("doing serial hangup...");
2567                                 if (info->tty)
2568                                         tty_hangup(info->tty);
2569                         }
2570                 }
2571
2572                 if ( (info->flags & ASYNC_CTS_FLOW) &&
2573                      (status & MISCSTATUS_CTS_LATCHED) ) {
2574                         if ( info->tty ) {
2575                                 if (info->tty->hw_stopped) {
2576                                         if (status & SerialSignal_CTS) {
2577                                                 if ( debug_level >= DEBUG_LEVEL_ISR )
2578                                                         printk("CTS tx start...");
2579                                                 info->tty->hw_stopped = 0;
2580                                                 tx_start(info);
2581                                                 info->pending_bh |= BH_TRANSMIT;
2582                                                 return;
2583                                         }
2584                                 } else {
2585                                         if (!(status & SerialSignal_CTS)) {
2586                                                 if ( debug_level >= DEBUG_LEVEL_ISR )
2587                                                         printk("CTS tx stop...");
2588                                                 info->tty->hw_stopped = 1;
2589                                                 tx_stop(info);
2590                                         }
2591                                 }
2592                         }
2593                 }
2594         }
2595
2596         info->pending_bh |= BH_STATUS;
2597 }
2598
2599 /* Interrupt service routine entry point.
2600  *
2601  * Arguments:
2602  *      irq             interrupt number that caused interrupt
2603  *      dev_id          device ID supplied during interrupt registration
2604  *      regs            interrupted processor context
2605  */
2606 static irqreturn_t synclinkmp_interrupt(int dummy, void *dev_id)
2607 {
2608         SLMP_INFO *info = dev_id;
2609         unsigned char status, status0, status1=0;
2610         unsigned char dmastatus, dmastatus0, dmastatus1=0;
2611         unsigned char timerstatus0, timerstatus1=0;
2612         unsigned char shift;
2613         unsigned int i;
2614         unsigned short tmp;
2615
2616         if ( debug_level >= DEBUG_LEVEL_ISR )
2617                 printk(KERN_DEBUG "%s(%d): synclinkmp_interrupt(%d)entry.\n",
2618                         __FILE__, __LINE__, info->irq_level);
2619
2620         spin_lock(&info->lock);
2621
2622         for(;;) {
2623
2624                 /* get status for SCA0 (ports 0-1) */
2625                 tmp = read_reg16(info, ISR0);   /* get ISR0 and ISR1 in one read */
2626                 status0 = (unsigned char)tmp;
2627                 dmastatus0 = (unsigned char)(tmp>>8);
2628                 timerstatus0 = read_reg(info, ISR2);
2629
2630                 if ( debug_level >= DEBUG_LEVEL_ISR )
2631                         printk(KERN_DEBUG "%s(%d):%s status0=%02x, dmastatus0=%02x, timerstatus0=%02x\n",
2632                                 __FILE__, __LINE__, info->device_name,
2633                                 status0, dmastatus0, timerstatus0);
2634
2635                 if (info->port_count == 4) {
2636                         /* get status for SCA1 (ports 2-3) */
2637                         tmp = read_reg16(info->port_array[2], ISR0);
2638                         status1 = (unsigned char)tmp;
2639                         dmastatus1 = (unsigned char)(tmp>>8);
2640                         timerstatus1 = read_reg(info->port_array[2], ISR2);
2641
2642                         if ( debug_level >= DEBUG_LEVEL_ISR )
2643                                 printk("%s(%d):%s status1=%02x, dmastatus1=%02x, timerstatus1=%02x\n",
2644                                         __FILE__,__LINE__,info->device_name,
2645                                         status1,dmastatus1,timerstatus1);
2646                 }
2647
2648                 if (!status0 && !dmastatus0 && !timerstatus0 &&
2649                          !status1 && !dmastatus1 && !timerstatus1)
2650                         break;
2651
2652                 for(i=0; i < info->port_count ; i++) {
2653                         if (info->port_array[i] == NULL)
2654                                 continue;
2655                         if (i < 2) {
2656                                 status = status0;
2657                                 dmastatus = dmastatus0;
2658                         } else {
2659                                 status = status1;
2660                                 dmastatus = dmastatus1;
2661                         }
2662
2663                         shift = i & 1 ? 4 :0;
2664
2665                         if (status & BIT0 << shift)
2666                                 isr_rxrdy(info->port_array[i]);
2667                         if (status & BIT1 << shift)
2668                                 isr_txrdy(info->port_array[i]);
2669                         if (status & BIT2 << shift)
2670                                 isr_rxint(info->port_array[i]);
2671                         if (status & BIT3 << shift)
2672                                 isr_txint(info->port_array[i]);
2673
2674                         if (dmastatus & BIT0 << shift)
2675                                 isr_rxdmaerror(info->port_array[i]);
2676                         if (dmastatus & BIT1 << shift)
2677                                 isr_rxdmaok(info->port_array[i]);
2678                         if (dmastatus & BIT2 << shift)
2679                                 isr_txdmaerror(info->port_array[i]);
2680                         if (dmastatus & BIT3 << shift)
2681                                 isr_txdmaok(info->port_array[i]);
2682                 }
2683
2684                 if (timerstatus0 & (BIT5 | BIT4))
2685                         isr_timer(info->port_array[0]);
2686                 if (timerstatus0 & (BIT7 | BIT6))
2687                         isr_timer(info->port_array[1]);
2688                 if (timerstatus1 & (BIT5 | BIT4))
2689                         isr_timer(info->port_array[2]);
2690                 if (timerstatus1 & (BIT7 | BIT6))
2691                         isr_timer(info->port_array[3]);
2692         }
2693
2694         for(i=0; i < info->port_count ; i++) {
2695                 SLMP_INFO * port = info->port_array[i];
2696
2697                 /* Request bottom half processing if there's something
2698                  * for it to do and the bh is not already running.
2699                  *
2700                  * Note: startup adapter diags require interrupts.
2701                  * do not request bottom half processing if the
2702                  * device is not open in a normal mode.
2703                  */
2704                 if ( port && (port->count || port->netcount) &&
2705                      port->pending_bh && !port->bh_running &&
2706                      !port->bh_requested ) {
2707                         if ( debug_level >= DEBUG_LEVEL_ISR )
2708                                 printk("%s(%d):%s queueing bh task.\n",
2709                                         __FILE__,__LINE__,port->device_name);
2710                         schedule_work(&port->task);
2711                         port->bh_requested = true;
2712                 }
2713         }
2714
2715         spin_unlock(&info->lock);
2716
2717         if ( debug_level >= DEBUG_LEVEL_ISR )
2718                 printk(KERN_DEBUG "%s(%d):synclinkmp_interrupt(%d)exit.\n",
2719                         __FILE__, __LINE__, info->irq_level);
2720         return IRQ_HANDLED;
2721 }
2722
2723 /* Initialize and start device.
2724  */
2725 static int startup(SLMP_INFO * info)
2726 {
2727         if ( debug_level >= DEBUG_LEVEL_INFO )
2728                 printk("%s(%d):%s tx_releaseup()\n",__FILE__,__LINE__,info->device_name);
2729
2730         if (info->flags & ASYNC_INITIALIZED)
2731                 return 0;
2732
2733         if (!info->tx_buf) {
2734                 info->tx_buf = kmalloc(info->max_frame_size, GFP_KERNEL);
2735                 if (!info->tx_buf) {
2736                         printk(KERN_ERR"%s(%d):%s can't allocate transmit buffer\n",
2737                                 __FILE__,__LINE__,info->device_name);
2738                         return -ENOMEM;
2739                 }
2740         }
2741
2742         info->pending_bh = 0;
2743
2744         memset(&info->icount, 0, sizeof(info->icount));
2745
2746         /* program hardware for current parameters */
2747         reset_port(info);
2748
2749         change_params(info);
2750
2751         mod_timer(&info->status_timer, jiffies + msecs_to_jiffies(10));
2752
2753         if (info->tty)
2754                 clear_bit(TTY_IO_ERROR, &info->tty->flags);
2755
2756         info->flags |= ASYNC_INITIALIZED;
2757
2758         return 0;
2759 }
2760
2761 /* Called by close() and hangup() to shutdown hardware
2762  */
2763 static void shutdown(SLMP_INFO * info)
2764 {
2765         unsigned long flags;
2766
2767         if (!(info->flags & ASYNC_INITIALIZED))
2768                 return;
2769
2770         if (debug_level >= DEBUG_LEVEL_INFO)
2771                 printk("%s(%d):%s synclinkmp_shutdown()\n",
2772                          __FILE__,__LINE__, info->device_name );
2773
2774         /* clear status wait queue because status changes */
2775         /* can't happen after shutting down the hardware */
2776         wake_up_interruptible(&info->status_event_wait_q);
2777         wake_up_interruptible(&info->event_wait_q);
2778
2779         del_timer(&info->tx_timer);
2780         del_timer(&info->status_timer);
2781
2782         kfree(info->tx_buf);
2783         info->tx_buf = NULL;
2784
2785         spin_lock_irqsave(&info->lock,flags);
2786
2787         reset_port(info);
2788
2789         if (!info->tty || info->tty->termios->c_cflag & HUPCL) {
2790                 info->serial_signals &= ~(SerialSignal_DTR + SerialSignal_RTS);
2791                 set_signals(info);
2792         }
2793
2794         spin_unlock_irqrestore(&info->lock,flags);
2795
2796         if (info->tty)
2797                 set_bit(TTY_IO_ERROR, &info->tty->flags);
2798
2799         info->flags &= ~ASYNC_INITIALIZED;
2800 }
2801
2802 static void program_hw(SLMP_INFO *info)
2803 {
2804         unsigned long flags;
2805
2806         spin_lock_irqsave(&info->lock,flags);
2807
2808         rx_stop(info);
2809         tx_stop(info);
2810
2811         info->tx_count = info->tx_put = info->tx_get = 0;
2812
2813         if (info->params.mode == MGSL_MODE_HDLC || info->netcount)
2814                 hdlc_mode(info);
2815         else
2816                 async_mode(info);
2817
2818         set_signals(info);
2819
2820         info->dcd_chkcount = 0;
2821         info->cts_chkcount = 0;
2822         info->ri_chkcount = 0;
2823         info->dsr_chkcount = 0;
2824
2825         info->ie1_value |= (CDCD|CCTS);
2826         write_reg(info, IE1, info->ie1_value);
2827
2828         get_signals(info);
2829
2830         if (info->netcount || (info->tty && info->tty->termios->c_cflag & CREAD) )
2831                 rx_start(info);
2832
2833         spin_unlock_irqrestore(&info->lock,flags);
2834 }
2835
2836 /* Reconfigure adapter based on new parameters
2837  */
2838 static void change_params(SLMP_INFO *info)
2839 {
2840         unsigned cflag;
2841         int bits_per_char;
2842
2843         if (!info->tty || !info->tty->termios)
2844                 return;
2845
2846         if (debug_level >= DEBUG_LEVEL_INFO)
2847                 printk("%s(%d):%s change_params()\n",
2848                          __FILE__,__LINE__, info->device_name );
2849
2850         cflag = info->tty->termios->c_cflag;
2851
2852         /* if B0 rate (hangup) specified then negate DTR and RTS */
2853         /* otherwise assert DTR and RTS */
2854         if (cflag & CBAUD)
2855                 info->serial_signals |= SerialSignal_RTS + SerialSignal_DTR;
2856         else
2857                 info->serial_signals &= ~(SerialSignal_RTS + SerialSignal_DTR);
2858
2859         /* byte size and parity */
2860
2861         switch (cflag & CSIZE) {
2862               case CS5: info->params.data_bits = 5; break;
2863               case CS6: info->params.data_bits = 6; break;
2864               case CS7: info->params.data_bits = 7; break;
2865               case CS8: info->params.data_bits = 8; break;
2866               /* Never happens, but GCC is too dumb to figure it out */
2867               default:  info->params.data_bits = 7; break;
2868               }
2869
2870         if (cflag & CSTOPB)
2871                 info->params.stop_bits = 2;
2872         else
2873                 info->params.stop_bits = 1;
2874
2875         info->params.parity = ASYNC_PARITY_NONE;
2876         if (cflag & PARENB) {
2877                 if (cflag & PARODD)
2878                         info->params.parity = ASYNC_PARITY_ODD;
2879                 else
2880                         info->params.parity = ASYNC_PARITY_EVEN;
2881 #ifdef CMSPAR
2882                 if (cflag & CMSPAR)
2883                         info->params.parity = ASYNC_PARITY_SPACE;
2884 #endif
2885         }
2886
2887         /* calculate number of jiffies to transmit a full
2888          * FIFO (32 bytes) at specified data rate
2889          */
2890         bits_per_char = info->params.data_bits +
2891                         info->params.stop_bits + 1;
2892
2893         /* if port data rate is set to 460800 or less then
2894          * allow tty settings to override, otherwise keep the
2895          * current data rate.
2896          */
2897         if (info->params.data_rate <= 460800) {
2898                 info->params.data_rate = tty_get_baud_rate(info->tty);
2899         }
2900
2901         if ( info->params.data_rate ) {
2902                 info->timeout = (32*HZ*bits_per_char) /
2903                                 info->params.data_rate;
2904         }
2905         info->timeout += HZ/50;         /* Add .02 seconds of slop */
2906
2907         if (cflag & CRTSCTS)
2908                 info->flags |= ASYNC_CTS_FLOW;
2909         else
2910                 info->flags &= ~ASYNC_CTS_FLOW;
2911
2912         if (cflag & CLOCAL)
2913                 info->flags &= ~ASYNC_CHECK_CD;
2914         else
2915                 info->flags |= ASYNC_CHECK_CD;
2916
2917         /* process tty input control flags */
2918
2919         info->read_status_mask2 = OVRN;
2920         if (I_INPCK(info->tty))
2921                 info->read_status_mask2 |= PE | FRME;
2922         if (I_BRKINT(info->tty) || I_PARMRK(info->tty))
2923                 info->read_status_mask1 |= BRKD;
2924         if (I_IGNPAR(info->tty))
2925                 info->ignore_status_mask2 |= PE | FRME;
2926         if (I_IGNBRK(info->tty)) {
2927                 info->ignore_status_mask1 |= BRKD;
2928                 /* If ignoring parity and break indicators, ignore
2929                  * overruns too.  (For real raw support).
2930                  */
2931                 if (I_IGNPAR(info->tty))
2932                         info->ignore_status_mask2 |= OVRN;
2933         }
2934
2935         program_hw(info);
2936 }
2937
2938 static int get_stats(SLMP_INFO * info, struct mgsl_icount __user *user_icount)
2939 {
2940         int err;
2941
2942         if (debug_level >= DEBUG_LEVEL_INFO)
2943                 printk("%s(%d):%s get_params()\n",
2944                          __FILE__,__LINE__, info->device_name);
2945
2946         if (!user_icount) {
2947                 memset(&info->icount, 0, sizeof(info->icount));
2948         } else {
2949                 COPY_TO_USER(err, user_icount, &info->icount, sizeof(struct mgsl_icount));
2950                 if (err)
2951                         return -EFAULT;
2952         }
2953
2954         return 0;
2955 }
2956
2957 static int get_params(SLMP_INFO * info, MGSL_PARAMS __user *user_params)
2958 {
2959         int err;
2960         if (debug_level >= DEBUG_LEVEL_INFO)
2961                 printk("%s(%d):%s get_params()\n",
2962                          __FILE__,__LINE__, info->device_name);
2963
2964         COPY_TO_USER(err,user_params, &info->params, sizeof(MGSL_PARAMS));
2965         if (err) {
2966                 if ( debug_level >= DEBUG_LEVEL_INFO )
2967                         printk( "%s(%d):%s get_params() user buffer copy failed\n",
2968                                 __FILE__,__LINE__,info->device_name);
2969                 return -EFAULT;
2970         }
2971
2972         return 0;
2973 }
2974
2975 static int set_params(SLMP_INFO * info, MGSL_PARAMS __user *new_params)
2976 {
2977         unsigned long flags;
2978         MGSL_PARAMS tmp_params;
2979         int err;
2980
2981         if (debug_level >= DEBUG_LEVEL_INFO)
2982                 printk("%s(%d):%s set_params\n",
2983                         __FILE__,__LINE__,info->device_name );
2984         COPY_FROM_USER(err,&tmp_params, new_params, sizeof(MGSL_PARAMS));
2985         if (err) {
2986                 if ( debug_level >= DEBUG_LEVEL_INFO )
2987                         printk( "%s(%d):%s set_params() user buffer copy failed\n",
2988                                 __FILE__,__LINE__,info->device_name);
2989                 return -EFAULT;
2990         }
2991
2992         spin_lock_irqsave(&info->lock,flags);
2993         memcpy(&info->params,&tmp_params,sizeof(MGSL_PARAMS));
2994         spin_unlock_irqrestore(&info->lock,flags);
2995
2996         change_params(info);
2997
2998         return 0;
2999 }
3000
3001 static int get_txidle(SLMP_INFO * info, int __user *idle_mode)
3002 {
3003         int err;
3004
3005         if (debug_level >= DEBUG_LEVEL_INFO)
3006                 printk("%s(%d):%s get_txidle()=%d\n",
3007                          __FILE__,__LINE__, info->device_name, info->idle_mode);
3008
3009         COPY_TO_USER(err,idle_mode, &info->idle_mode, sizeof(int));
3010         if (err) {
3011                 if ( debug_level >= DEBUG_LEVEL_INFO )
3012                         printk( "%s(%d):%s get_txidle() user buffer copy failed\n",
3013                                 __FILE__,__LINE__,info->device_name);
3014                 return -EFAULT;
3015         }
3016
3017         return 0;
3018 }
3019
3020 static int set_txidle(SLMP_INFO * info, int idle_mode)
3021 {
3022         unsigned long flags;
3023
3024         if (debug_level >= DEBUG_LEVEL_INFO)
3025                 printk("%s(%d):%s set_txidle(%d)\n",
3026                         __FILE__,__LINE__,info->device_name, idle_mode );
3027
3028         spin_lock_irqsave(&info->lock,flags);
3029         info->idle_mode = idle_mode;
3030         tx_set_idle( info );
3031         spin_unlock_irqrestore(&info->lock,flags);
3032         return 0;
3033 }
3034
3035 static int tx_enable(SLMP_INFO * info, int enable)
3036 {
3037         unsigned long flags;
3038
3039         if (debug_level >= DEBUG_LEVEL_INFO)
3040                 printk("%s(%d):%s tx_enable(%d)\n",
3041                         __FILE__,__LINE__,info->device_name, enable);
3042
3043         spin_lock_irqsave(&info->lock,flags);
3044         if ( enable ) {
3045                 if ( !info->tx_enabled ) {
3046                         tx_start(info);
3047                 }
3048         } else {
3049                 if ( info->tx_enabled )
3050                         tx_stop(info);
3051         }
3052         spin_unlock_irqrestore(&info->lock,flags);
3053         return 0;
3054 }
3055
3056 /* abort send HDLC frame
3057  */
3058 static int tx_abort(SLMP_INFO * info)
3059 {
3060         unsigned long flags;
3061
3062         if (debug_level >= DEBUG_LEVEL_INFO)
3063                 printk("%s(%d):%s tx_abort()\n",
3064                         __FILE__,__LINE__,info->device_name);
3065
3066         spin_lock_irqsave(&info->lock,flags);
3067         if ( info->tx_active && info->params.mode == MGSL_MODE_HDLC ) {
3068                 info->ie1_value &= ~UDRN;
3069                 info->ie1_value |= IDLE;
3070                 write_reg(info, IE1, info->ie1_value);  /* disable tx status interrupts */
3071                 write_reg(info, SR1, (unsigned char)(IDLE + UDRN));     /* clear pending */
3072
3073                 write_reg(info, TXDMA + DSR, 0);                /* disable DMA channel */
3074                 write_reg(info, TXDMA + DCMD, SWABORT); /* reset/init DMA channel */
3075
3076                 write_reg(info, CMD, TXABORT);
3077         }
3078         spin_unlock_irqrestore(&info->lock,flags);
3079         return 0;
3080 }
3081
3082 static int rx_enable(SLMP_INFO * info, int enable)
3083 {
3084         unsigned long flags;
3085
3086         if (debug_level >= DEBUG_LEVEL_INFO)
3087                 printk("%s(%d):%s rx_enable(%d)\n",
3088                         __FILE__,__LINE__,info->device_name,enable);
3089
3090         spin_lock_irqsave(&info->lock,flags);
3091         if ( enable ) {
3092                 if ( !info->rx_enabled )
3093                         rx_start(info);
3094         } else {
3095                 if ( info->rx_enabled )
3096                         rx_stop(info);
3097         }
3098         spin_unlock_irqrestore(&info->lock,flags);
3099         return 0;
3100 }
3101
3102 /* wait for specified event to occur
3103  */
3104 static int wait_mgsl_event(SLMP_INFO * info, int __user *mask_ptr)
3105 {
3106         unsigned long flags;
3107         int s;
3108         int rc=0;
3109         struct mgsl_icount cprev, cnow;
3110         int events;
3111         int mask;
3112         struct  _input_signal_events oldsigs, newsigs;
3113         DECLARE_WAITQUEUE(wait, current);
3114
3115         COPY_FROM_USER(rc,&mask, mask_ptr, sizeof(int));
3116         if (rc) {
3117                 return  -EFAULT;
3118         }
3119
3120         if (debug_level >= DEBUG_LEVEL_INFO)
3121                 printk("%s(%d):%s wait_mgsl_event(%d)\n",
3122                         __FILE__,__LINE__,info->device_name,mask);
3123
3124         spin_lock_irqsave(&info->lock,flags);
3125
3126         /* return immediately if state matches requested events */
3127         get_signals(info);
3128         s = info->serial_signals;
3129
3130         events = mask &
3131                 ( ((s & SerialSignal_DSR) ? MgslEvent_DsrActive:MgslEvent_DsrInactive) +
3132                   ((s & SerialSignal_DCD) ? MgslEvent_DcdActive:MgslEvent_DcdInactive) +
3133                   ((s & SerialSignal_CTS) ? MgslEvent_CtsActive:MgslEvent_CtsInactive) +
3134                   ((s & SerialSignal_RI)  ? MgslEvent_RiActive :MgslEvent_RiInactive) );
3135         if (events) {
3136                 spin_unlock_irqrestore(&info->lock,flags);
3137                 goto exit;
3138         }
3139
3140         /* save current irq counts */
3141         cprev = info->icount;
3142         oldsigs = info->input_signal_events;
3143
3144         /* enable hunt and idle irqs if needed */
3145         if (mask & (MgslEvent_ExitHuntMode+MgslEvent_IdleReceived)) {
3146                 unsigned char oldval = info->ie1_value;
3147                 unsigned char newval = oldval +
3148                          (mask & MgslEvent_ExitHuntMode ? FLGD:0) +
3149                          (mask & MgslEvent_IdleReceived ? IDLD:0);
3150                 if ( oldval != newval ) {
3151                         info->ie1_value = newval;
3152                         write_reg(info, IE1, info->ie1_value);
3153                 }
3154         }
3155
3156         set_current_state(TASK_INTERRUPTIBLE);
3157         add_wait_queue(&info->event_wait_q, &wait);
3158
3159         spin_unlock_irqrestore(&info->lock,flags);
3160
3161         for(;;) {
3162                 schedule();
3163                 if (signal_pending(current)) {
3164                         rc = -ERESTARTSYS;
3165                         break;
3166                 }
3167
3168                 /* get current irq counts */
3169                 spin_lock_irqsave(&info->lock,flags);
3170                 cnow = info->icount;
3171                 newsigs = info->input_signal_events;
3172                 set_current_state(TASK_INTERRUPTIBLE);
3173                 spin_unlock_irqrestore(&info->lock,flags);
3174
3175                 /* if no change, wait aborted for some reason */
3176                 if (newsigs.dsr_up   == oldsigs.dsr_up   &&
3177                     newsigs.dsr_down == oldsigs.dsr_down &&
3178                     newsigs.dcd_up   == oldsigs.dcd_up   &&
3179                     newsigs.dcd_down == oldsigs.dcd_down &&
3180                     newsigs.cts_up   == oldsigs.cts_up   &&
3181                     newsigs.cts_down == oldsigs.cts_down &&
3182                     newsigs.ri_up    == oldsigs.ri_up    &&
3183                     newsigs.ri_down  == oldsigs.ri_down  &&
3184                     cnow.exithunt    == cprev.exithunt   &&
3185                     cnow.rxidle      == cprev.rxidle) {
3186                         rc = -EIO;
3187                         break;
3188                 }
3189
3190                 events = mask &
3191                         ( (newsigs.dsr_up   != oldsigs.dsr_up   ? MgslEvent_DsrActive:0)   +
3192                           (newsigs.dsr_down != oldsigs.dsr_down ? MgslEvent_DsrInactive:0) +
3193                           (newsigs.dcd_up   != oldsigs.dcd_up   ? MgslEvent_DcdActive:0)   +
3194                           (newsigs.dcd_down != oldsigs.dcd_down ? MgslEvent_DcdInactive:0) +
3195                           (newsigs.cts_up   != oldsigs.cts_up   ? MgslEvent_CtsActive:0)   +
3196                           (newsigs.cts_down != oldsigs.cts_down ? MgslEvent_CtsInactive:0) +
3197                           (newsigs.ri_up    != oldsigs.ri_up    ? MgslEvent_RiActive:0)    +
3198                           (newsigs.ri_down  != oldsigs.ri_down  ? MgslEvent_RiInactive:0)  +
3199                           (cnow.exithunt    != cprev.exithunt   ? MgslEvent_ExitHuntMode:0) +
3200                           (cnow.rxidle      != cprev.rxidle     ? MgslEvent_IdleReceived:0) );
3201                 if (events)
3202                         break;
3203
3204                 cprev = cnow;
3205                 oldsigs = newsigs;
3206         }
3207
3208         remove_wait_queue(&info->event_wait_q, &wait);
3209         set_current_state(TASK_RUNNING);
3210
3211
3212         if (mask & (MgslEvent_ExitHuntMode + MgslEvent_IdleReceived)) {
3213                 spin_lock_irqsave(&info->lock,flags);
3214                 if (!waitqueue_active(&info->event_wait_q)) {
3215                         /* disable enable exit hunt mode/idle rcvd IRQs */
3216                         info->ie1_value &= ~(FLGD|IDLD);
3217                         write_reg(info, IE1, info->ie1_value);
3218                 }
3219                 spin_unlock_irqrestore(&info->lock,flags);
3220         }
3221 exit:
3222         if ( rc == 0 )
3223                 PUT_USER(rc, events, mask_ptr);
3224
3225         return rc;
3226 }
3227
3228 static int modem_input_wait(SLMP_INFO *info,int arg)
3229 {
3230         unsigned long flags;
3231         int rc;
3232         struct mgsl_icount cprev, cnow;
3233         DECLARE_WAITQUEUE(wait, current);
3234
3235         /* save current irq counts */
3236         spin_lock_irqsave(&info->lock,flags);
3237         cprev = info->icount;
3238         add_wait_queue(&info->status_event_wait_q, &wait);
3239         set_current_state(TASK_INTERRUPTIBLE);
3240         spin_unlock_irqrestore(&info->lock,flags);
3241
3242         for(;;) {
3243                 schedule();
3244                 if (signal_pending(current)) {
3245                         rc = -ERESTARTSYS;
3246                         break;
3247                 }
3248
3249                 /* get new irq counts */
3250                 spin_lock_irqsave(&info->lock,flags);
3251                 cnow = info->icount;
3252                 set_current_state(TASK_INTERRUPTIBLE);
3253                 spin_unlock_irqrestore(&info->lock,flags);
3254
3255                 /* if no change, wait aborted for some reason */
3256                 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
3257                     cnow.dcd == cprev.dcd && cnow.cts == cprev.cts) {
3258                         rc = -EIO;
3259                         break;
3260                 }
3261
3262                 /* check for change in caller specified modem input */
3263                 if ((arg & TIOCM_RNG && cnow.rng != cprev.rng) ||
3264                     (arg & TIOCM_DSR && cnow.dsr != cprev.dsr) ||
3265                     (arg & TIOCM_CD  && cnow.dcd != cprev.dcd) ||
3266                     (arg & TIOCM_CTS && cnow.cts != cprev.cts)) {
3267                         rc = 0;
3268                         break;
3269                 }
3270
3271                 cprev = cnow;
3272         }
3273         remove_wait_queue(&info->status_event_wait_q, &wait);
3274         set_current_state(TASK_RUNNING);
3275         return rc;
3276 }
3277
3278 /* return the state of the serial control and status signals
3279  */
3280 static int tiocmget(struct tty_struct *tty, struct file *file)
3281 {
3282         SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
3283         unsigned int result;
3284         unsigned long flags;
3285
3286         spin_lock_irqsave(&info->lock,flags);
3287         get_signals(info);
3288         spin_unlock_irqrestore(&info->lock,flags);
3289
3290         result = ((info->serial_signals & SerialSignal_RTS) ? TIOCM_RTS:0) +
3291                 ((info->serial_signals & SerialSignal_DTR) ? TIOCM_DTR:0) +
3292                 ((info->serial_signals & SerialSignal_DCD) ? TIOCM_CAR:0) +
3293                 ((info->serial_signals & SerialSignal_RI)  ? TIOCM_RNG:0) +
3294                 ((info->serial_signals & SerialSignal_DSR) ? TIOCM_DSR:0) +
3295                 ((info->serial_signals & SerialSignal_CTS) ? TIOCM_CTS:0);
3296
3297         if (debug_level >= DEBUG_LEVEL_INFO)
3298                 printk("%s(%d):%s tiocmget() value=%08X\n",
3299                          __FILE__,__LINE__, info->device_name, result );
3300         return result;
3301 }
3302
3303 /* set modem control signals (DTR/RTS)
3304  */
3305 static int tiocmset(struct tty_struct *tty, struct file *file,
3306                     unsigned int set, unsigned int clear)
3307 {
3308         SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
3309         unsigned long flags;
3310
3311         if (debug_level >= DEBUG_LEVEL_INFO)
3312                 printk("%s(%d):%s tiocmset(%x,%x)\n",
3313                         __FILE__,__LINE__,info->device_name, set, clear);
3314
3315         if (set & TIOCM_RTS)
3316                 info->serial_signals |= SerialSignal_RTS;
3317         if (set & TIOCM_DTR)
3318                 info->serial_signals |= SerialSignal_DTR;
3319         if (clear & TIOCM_RTS)
3320                 info->serial_signals &= ~SerialSignal_RTS;
3321         if (clear & TIOCM_DTR)
3322                 info->serial_signals &= ~SerialSignal_DTR;
3323
3324         spin_lock_irqsave(&info->lock,flags);
3325         set_signals(info);
3326         spin_unlock_irqrestore(&info->lock,flags);
3327
3328         return 0;
3329 }
3330
3331
3332
3333 /* Block the current process until the specified port is ready to open.
3334  */
3335 static int block_til_ready(struct tty_struct *tty, struct file *filp,
3336                            SLMP_INFO *info)
3337 {
3338         DECLARE_WAITQUEUE(wait, current);
3339         int             retval;
3340         bool            do_clocal = false;
3341         bool            extra_count = false;
3342         unsigned long   flags;
3343
3344         if (debug_level >= DEBUG_LEVEL_INFO)
3345                 printk("%s(%d):%s block_til_ready()\n",
3346                          __FILE__,__LINE__, tty->driver->name );
3347
3348         if (filp->f_flags & O_NONBLOCK || tty->flags & (1 << TTY_IO_ERROR)){
3349                 /* nonblock mode is set or port is not enabled */
3350                 /* just verify that callout device is not active */
3351                 info->flags |= ASYNC_NORMAL_ACTIVE;
3352                 return 0;
3353         }
3354
3355         if (tty->termios->c_cflag & CLOCAL)
3356                 do_clocal = true;
3357
3358         /* Wait for carrier detect and the line to become
3359          * free (i.e., not in use by the callout).  While we are in
3360          * this loop, info->count is dropped by one, so that
3361          * close() knows when to free things.  We restore it upon
3362          * exit, either normal or abnormal.
3363          */
3364
3365         retval = 0;
3366         add_wait_queue(&info->open_wait, &wait);
3367
3368         if (debug_level >= DEBUG_LEVEL_INFO)
3369                 printk("%s(%d):%s block_til_ready() before block, count=%d\n",
3370                          __FILE__,__LINE__, tty->driver->name, info->count );
3371
3372         spin_lock_irqsave(&info->lock, flags);
3373         if (!tty_hung_up_p(filp)) {
3374                 extra_count = true;
3375                 info->count--;
3376         }
3377         spin_unlock_irqrestore(&info->lock, flags);
3378         info->blocked_open++;
3379
3380         while (1) {
3381                 if ((tty->termios->c_cflag & CBAUD)) {
3382                         spin_lock_irqsave(&info->lock,flags);
3383                         info->serial_signals |= SerialSignal_RTS + SerialSignal_DTR;
3384                         set_signals(info);
3385                         spin_unlock_irqrestore(&info->lock,flags);
3386                 }
3387
3388                 set_current_state(TASK_INTERRUPTIBLE);
3389
3390                 if (tty_hung_up_p(filp) || !(info->flags & ASYNC_INITIALIZED)){
3391                         retval = (info->flags & ASYNC_HUP_NOTIFY) ?
3392                                         -EAGAIN : -ERESTARTSYS;
3393                         break;
3394                 }
3395
3396                 spin_lock_irqsave(&info->lock,flags);
3397                 get_signals(info);
3398                 spin_unlock_irqrestore(&info->lock,flags);
3399
3400                 if (!(info->flags & ASYNC_CLOSING) &&
3401                     (do_clocal || (info->serial_signals & SerialSignal_DCD)) ) {
3402                         break;
3403                 }
3404
3405                 if (signal_pending(current)) {
3406                         retval = -ERESTARTSYS;
3407                         break;
3408                 }
3409
3410                 if (debug_level >= DEBUG_LEVEL_INFO)
3411                         printk("%s(%d):%s block_til_ready() count=%d\n",
3412                                  __FILE__,__LINE__, tty->driver->name, info->count );
3413
3414                 schedule();
3415         }
3416
3417         set_current_state(TASK_RUNNING);
3418         remove_wait_queue(&info->open_wait, &wait);
3419
3420         if (extra_count)
3421                 info->count++;
3422         info->blocked_open--;
3423
3424         if (debug_level >= DEBUG_LEVEL_INFO)
3425                 printk("%s(%d):%s block_til_ready() after, count=%d\n",
3426                          __FILE__,__LINE__, tty->driver->name, info->count );
3427
3428         if (!retval)
3429                 info->flags |= ASYNC_NORMAL_ACTIVE;
3430
3431         return retval;
3432 }
3433
3434 static int alloc_dma_bufs(SLMP_INFO *info)
3435 {
3436         unsigned short BuffersPerFrame;
3437         unsigned short BufferCount;
3438
3439         // Force allocation to start at 64K boundary for each port.
3440         // This is necessary because *all* buffer descriptors for a port
3441         // *must* be in the same 64K block. All descriptors on a port
3442         // share a common 'base' address (upper 8 bits of 24 bits) programmed
3443         // into the CBP register.
3444         info->port_array[0]->last_mem_alloc = (SCA_MEM_SIZE/4) * info->port_num;
3445
3446         /* Calculate the number of DMA buffers necessary to hold the */
3447         /* largest allowable frame size. Note: If the max frame size is */
3448         /* not an even multiple of the DMA buffer size then we need to */
3449         /* round the buffer count per frame up one. */
3450
3451         BuffersPerFrame = (unsigned short)(info->max_frame_size/SCABUFSIZE);
3452         if ( info->max_frame_size % SCABUFSIZE )
3453                 BuffersPerFrame++;
3454
3455         /* calculate total number of data buffers (SCABUFSIZE) possible
3456          * in one ports memory (SCA_MEM_SIZE/4) after allocating memory
3457          * for the descriptor list (BUFFERLISTSIZE).
3458          */
3459         BufferCount = (SCA_MEM_SIZE/4 - BUFFERLISTSIZE)/SCABUFSIZE;
3460
3461         /* limit number of buffers to maximum amount of descriptors */
3462         if (BufferCount > BUFFERLISTSIZE/sizeof(SCADESC))
3463                 BufferCount = BUFFERLISTSIZE/sizeof(SCADESC);
3464
3465         /* use enough buffers to transmit one max size frame */
3466         info->tx_buf_count = BuffersPerFrame + 1;
3467
3468         /* never use more than half the available buffers for transmit */
3469         if (info->tx_buf_count > (BufferCount/2))
3470                 info->tx_buf_count = BufferCount/2;
3471
3472         if (info->tx_buf_count > SCAMAXDESC)
3473                 info->tx_buf_count = SCAMAXDESC;
3474
3475         /* use remaining buffers for receive */
3476         info->rx_buf_count = BufferCount - info->tx_buf_count;
3477
3478         if (info->rx_buf_count > SCAMAXDESC)
3479                 info->rx_buf_count = SCAMAXDESC;
3480
3481         if ( debug_level >= DEBUG_LEVEL_INFO )
3482                 printk("%s(%d):%s Allocating %d TX and %d RX DMA buffers.\n",
3483                         __FILE__,__LINE__, info->device_name,
3484                         info->tx_buf_count,info->rx_buf_count);
3485
3486         if ( alloc_buf_list( info ) < 0 ||
3487                 alloc_frame_bufs(info,
3488                                         info->rx_buf_list,
3489                                         info->rx_buf_list_ex,
3490                                         info->rx_buf_count) < 0 ||
3491                 alloc_frame_bufs(info,
3492                                         info->tx_buf_list,
3493                                         info->tx_buf_list_ex,
3494                                         info->tx_buf_count) < 0 ||
3495                 alloc_tmp_rx_buf(info) < 0 ) {
3496                 printk("%s(%d):%s Can't allocate DMA buffer memory\n",
3497                         __FILE__,__LINE__, info->device_name);
3498                 return -ENOMEM;
3499         }
3500
3501         rx_reset_buffers( info );
3502
3503         return 0;
3504 }
3505
3506 /* Allocate DMA buffers for the transmit and receive descriptor lists.
3507  */
3508 static int alloc_buf_list(SLMP_INFO *info)
3509 {
3510         unsigned int i;
3511
3512         /* build list in adapter shared memory */
3513         info->buffer_list = info->memory_base + info->port_array[0]->last_mem_alloc;
3514         info->buffer_list_phys = info->port_array[0]->last_mem_alloc;
3515         info->port_array[0]->last_mem_alloc += BUFFERLISTSIZE;
3516
3517         memset(info->buffer_list, 0, BUFFERLISTSIZE);
3518
3519         /* Save virtual address pointers to the receive and */
3520         /* transmit buffer lists. (Receive 1st). These pointers will */
3521         /* be used by the processor to access the lists. */
3522         info->rx_buf_list = (SCADESC *)info->buffer_list;
3523
3524         info->tx_buf_list = (SCADESC *)info->buffer_list;
3525         info->tx_buf_list += info->rx_buf_count;
3526
3527         /* Build links for circular buffer entry lists (tx and rx)
3528          *
3529          * Note: links are physical addresses read by the SCA device
3530          * to determine the next buffer entry to use.
3531          */
3532
3533         for ( i = 0; i < info->rx_buf_count; i++ ) {
3534                 /* calculate and store physical address of this buffer entry */
3535                 info->rx_buf_list_ex[i].phys_entry =
3536                         info->buffer_list_phys + (i * sizeof(SCABUFSIZE));
3537
3538                 /* calculate and store physical address of */
3539                 /* next entry in cirular list of entries */
3540                 info->rx_buf_list[i].next = info->buffer_list_phys;
3541                 if ( i < info->rx_buf_count - 1 )
3542                         info->rx_buf_list[i].next += (i + 1) * sizeof(SCADESC);
3543
3544                 info->rx_buf_list[i].length = SCABUFSIZE;
3545         }
3546
3547         for ( i = 0; i < info->tx_buf_count; i++ ) {
3548                 /* calculate and store physical address of this buffer entry */
3549                 info->tx_buf_list_ex[i].phys_entry = info->buffer_list_phys +
3550                         ((info->rx_buf_count + i) * sizeof(SCADESC));
3551
3552                 /* calculate and store physical address of */
3553                 /* next entry in cirular list of entries */
3554
3555                 info->tx_buf_list[i].next = info->buffer_list_phys +
3556                         info->rx_buf_count * sizeof(SCADESC);
3557
3558                 if ( i < info->tx_buf_count - 1 )
3559                         info->tx_buf_list[i].next += (i + 1) * sizeof(SCADESC);
3560         }
3561
3562         return 0;
3563 }
3564
3565 /* Allocate the frame DMA buffers used by the specified buffer list.
3566  */
3567 static int alloc_frame_bufs(SLMP_INFO *info, SCADESC *buf_list,SCADESC_EX *buf_list_ex,int count)
3568 {
3569         int i;
3570         unsigned long phys_addr;
3571
3572         for ( i = 0; i < count; i++ ) {
3573                 buf_list_ex[i].virt_addr = info->memory_base + info->port_array[0]->last_mem_alloc;
3574                 phys_addr = info->port_array[0]->last_mem_alloc;
3575                 info->port_array[0]->last_mem_alloc += SCABUFSIZE;
3576
3577                 buf_list[i].buf_ptr  = (unsigned short)phys_addr;
3578                 buf_list[i].buf_base = (unsigned char)(phys_addr >> 16);
3579         }
3580
3581         return 0;
3582 }
3583
3584 static void free_dma_bufs(SLMP_INFO *info)
3585 {
3586         info->buffer_list = NULL;
3587         info->rx_buf_list = NULL;
3588         info->tx_buf_list = NULL;
3589 }
3590
3591 /* allocate buffer large enough to hold max_frame_size.
3592  * This buffer is used to pass an assembled frame to the line discipline.
3593  */
3594 static int alloc_tmp_rx_buf(SLMP_INFO *info)
3595 {
3596         info->tmp_rx_buf = kmalloc(info->max_frame_size, GFP_KERNEL);
3597         if (info->tmp_rx_buf == NULL)
3598                 return -ENOMEM;
3599         return 0;
3600 }
3601
3602 static void free_tmp_rx_buf(SLMP_INFO *info)
3603 {
3604         kfree(info->tmp_rx_buf);
3605         info->tmp_rx_buf = NULL;
3606 }
3607
3608 static int claim_resources(SLMP_INFO *info)
3609 {
3610         if (request_mem_region(info->phys_memory_base,SCA_MEM_SIZE,"synclinkmp") == NULL) {
3611                 printk( "%s(%d):%s mem addr conflict, Addr=%08X\n",
3612                         __FILE__,__LINE__,info->device_name, info->phys_memory_base);
3613                 info->init_error = DiagStatus_AddressConflict;
3614                 goto errout;
3615         }
3616         else
3617                 info->shared_mem_requested = true;
3618
3619         if (request_mem_region(info->phys_lcr_base + info->lcr_offset,128,"synclinkmp") == NULL) {
3620                 printk( "%s(%d):%s lcr mem addr conflict, Addr=%08X\n",
3621                         __FILE__,__LINE__,info->device_name, info->phys_lcr_base);
3622                 info->init_error = DiagStatus_AddressConflict;
3623                 goto errout;
3624         }
3625         else
3626                 info->lcr_mem_requested = true;
3627
3628         if (request_mem_region(info->phys_sca_base + info->sca_offset,SCA_BASE_SIZE,"synclinkmp") == NULL) {
3629                 printk( "%s(%d):%s sca mem addr conflict, Addr=%08X\n",
3630                         __FILE__,__LINE__,info->device_name, info->phys_sca_base);
3631                 info->init_error = DiagStatus_AddressConflict;
3632                 goto errout;
3633         }
3634         else
3635                 info->sca_base_requested = true;
3636
3637         if (request_mem_region(info->phys_statctrl_base + info->statctrl_offset,SCA_REG_SIZE,"synclinkmp") == NULL) {
3638                 printk( "%s(%d):%s stat/ctrl mem addr conflict, Addr=%08X\n",
3639                         __FILE__,__LINE__,info->device_name, info->phys_statctrl_base);
3640                 info->init_error = DiagStatus_AddressConflict;
3641                 goto errout;
3642         }
3643         else
3644                 info->sca_statctrl_requested = true;
3645
3646         info->memory_base = ioremap(info->phys_memory_base,SCA_MEM_SIZE);
3647         if (!info->memory_base) {
3648                 printk( "%s(%d):%s Cant map shared memory, MemAddr=%08X\n",
3649                         __FILE__,__LINE__,info->device_name, info->phys_memory_base );
3650                 info->init_error = DiagStatus_CantAssignPciResources;
3651                 goto errout;
3652         }
3653
3654         info->lcr_base = ioremap(info->phys_lcr_base,PAGE_SIZE);
3655         if (!info->lcr_base) {
3656                 printk( "%s(%d):%s Cant map LCR memory, MemAddr=%08X\n",
3657                         __FILE__,__LINE__,info->device_name, info->phys_lcr_base );
3658                 info->init_error = DiagStatus_CantAssignPciResources;
3659                 goto errout;
3660         }
3661         info->lcr_base += info->lcr_offset;
3662
3663         info->sca_base = ioremap(info->phys_sca_base,PAGE_SIZE);
3664         if (!info->sca_base) {
3665                 printk( "%s(%d):%s Cant map SCA memory, MemAddr=%08X\n",
3666                         __FILE__,__LINE__,info->device_name, info->phys_sca_base );
3667                 info->init_error = DiagStatus_CantAssignPciResources;
3668                 goto errout;
3669         }
3670         info->sca_base += info->sca_offset;
3671
3672         info->statctrl_base = ioremap(info->phys_statctrl_base,PAGE_SIZE);
3673         if (!info->statctrl_base) {
3674                 printk( "%s(%d):%s Cant map SCA Status/Control memory, MemAddr=%08X\n",
3675                         __FILE__,__LINE__,info->device_name, info->phys_statctrl_base );
3676                 info->init_error = DiagStatus_CantAssignPciResources;
3677                 goto errout;
3678         }
3679         info->statctrl_base += info->statctrl_offset;
3680
3681         if ( !memory_test(info) ) {
3682                 printk( "%s(%d):Shared Memory Test failed for device %s MemAddr=%08X\n",
3683                         __FILE__,__LINE__,info->device_name, info->phys_memory_base );
3684                 info->init_error = DiagStatus_MemoryError;
3685                 goto errout;
3686         }
3687
3688         return 0;
3689
3690 errout:
3691         release_resources( info );
3692         return -ENODEV;
3693 }
3694
3695 static void release_resources(SLMP_INFO *info)
3696 {
3697         if ( debug_level >= DEBUG_LEVEL_INFO )
3698                 printk( "%s(%d):%s release_resources() entry\n",
3699                         __FILE__,__LINE__,info->device_name );
3700
3701         if ( info->irq_requested ) {
3702                 free_irq(info->irq_level, info);
3703                 info->irq_requested = false;
3704         }
3705
3706         if ( info->shared_mem_requested ) {
3707                 release_mem_region(info->phys_memory_base,SCA_MEM_SIZE);
3708                 info->shared_mem_requested = false;
3709         }
3710         if ( info->lcr_mem_requested ) {
3711                 release_mem_region(info->phys_lcr_base + info->lcr_offset,128);
3712                 info->lcr_mem_requested = false;
3713         }
3714         if ( info->sca_base_requested ) {
3715                 release_mem_region(info->phys_sca_base + info->sca_offset,SCA_BASE_SIZE);
3716                 info->sca_base_requested = false;
3717         }
3718         if ( info->sca_statctrl_requested ) {
3719                 release_mem_region(info->phys_statctrl_base + info->statctrl_offset,SCA_REG_SIZE);
3720                 info->sca_statctrl_requested = false;
3721         }
3722
3723         if (info->memory_base){
3724                 iounmap(info->memory_base);
3725                 info->memory_base = NULL;
3726         }
3727
3728         if (info->sca_base) {
3729                 iounmap(info->sca_base - info->sca_offset);
3730                 info->sca_base=NULL;
3731         }
3732
3733         if (info->statctrl_base) {
3734                 iounmap(info->statctrl_base - info->statctrl_offset);
3735                 info->statctrl_base=NULL;
3736         }
3737
3738         if (info->lcr_base){
3739                 iounmap(info->lcr_base - info->lcr_offset);
3740                 info->lcr_base = NULL;
3741         }
3742
3743         if ( debug_level >= DEBUG_LEVEL_INFO )
3744                 printk( "%s(%d):%s release_resources() exit\n",
3745                         __FILE__,__LINE__,info->device_name );
3746 }
3747
3748 /* Add the specified device instance data structure to the
3749  * global linked list of devices and increment the device count.
3750  */
3751 static void add_device(SLMP_INFO *info)
3752 {
3753         info->next_device = NULL;
3754         info->line = synclinkmp_device_count;
3755         sprintf(info->device_name,"ttySLM%dp%d",info->adapter_num,info->port_num);
3756
3757         if (info->line < MAX_DEVICES) {
3758                 if (maxframe[info->line])
3759                         info->max_frame_size = maxframe[info->line];
3760                 info->dosyncppp = dosyncppp[info->line];
3761         }
3762
3763         synclinkmp_device_count++;
3764
3765         if ( !synclinkmp_device_list )
3766                 synclinkmp_device_list = info;
3767         else {
3768                 SLMP_INFO *current_dev = synclinkmp_device_list;
3769                 while( current_dev->next_device )
3770                         current_dev = current_dev->next_device;
3771                 current_dev->next_device = info;
3772         }
3773
3774         if ( info->max_frame_size < 4096 )
3775                 info->max_frame_size = 4096;
3776         else if ( info->max_frame_size > 65535 )
3777                 info->max_frame_size = 65535;
3778
3779         printk( "SyncLink MultiPort %s: "
3780                 "Mem=(%08x %08X %08x %08X) IRQ=%d MaxFrameSize=%u\n",
3781                 info->device_name,
3782                 info->phys_sca_base,
3783                 info->phys_memory_base,
3784                 info->phys_statctrl_base,
3785                 info->phys_lcr_base,
3786                 info->irq_level,
3787                 info->max_frame_size );
3788
3789 #if SYNCLINK_GENERIC_HDLC
3790         hdlcdev_init(info);
3791 #endif
3792 }
3793
3794 /* Allocate and initialize a device instance structure
3795  *
3796  * Return Value:        pointer to SLMP_INFO if success, otherwise NULL
3797  */
3798 static SLMP_INFO *alloc_dev(int adapter_num, int port_num, struct pci_dev *pdev)
3799 {
3800         SLMP_INFO *info;
3801
3802         info = kzalloc(sizeof(SLMP_INFO),
3803                  GFP_KERNEL);
3804
3805         if (!info) {
3806                 printk("%s(%d) Error can't allocate device instance data for adapter %d, port %d\n",
3807                         __FILE__,__LINE__, adapter_num, port_num);
3808         } else {
3809                 info->magic = MGSL_MAGIC;
3810                 INIT_WORK(&info->task, bh_handler);
3811                 info->max_frame_size = 4096;
3812                 info->close_delay = 5*HZ/10;
3813                 info->closing_wait = 30*HZ;
3814                 init_waitqueue_head(&info->open_wait);
3815                 init_waitqueue_head(&info->close_wait);
3816                 init_waitqueue_head(&info->status_event_wait_q);
3817                 init_waitqueue_head(&info->event_wait_q);
3818                 spin_lock_init(&info->netlock);
3819                 memcpy(&info->params,&default_params,sizeof(MGSL_PARAMS));
3820                 info->idle_mode = HDLC_TXIDLE_FLAGS;
3821                 info->adapter_num = adapter_num;
3822                 info->port_num = port_num;
3823
3824                 /* Copy configuration info to device instance data */
3825                 info->irq_level = pdev->irq;
3826                 info->phys_lcr_base = pci_resource_start(pdev,0);
3827                 info->phys_sca_base = pci_resource_start(pdev,2);
3828                 info->phys_memory_base = pci_resource_start(pdev,3);
3829                 info->phys_statctrl_base = pci_resource_start(pdev,4);
3830
3831                 /* Because veremap only works on page boundaries we must map
3832                  * a larger area than is actually implemented for the LCR
3833                  * memory range. We map a full page starting at the page boundary.
3834                  */
3835                 info->lcr_offset    = info->phys_lcr_base & (PAGE_SIZE-1);
3836                 info->phys_lcr_base &= ~(PAGE_SIZE-1);
3837
3838                 info->sca_offset    = info->phys_sca_base & (PAGE_SIZE-1);
3839                 info->phys_sca_base &= ~(PAGE_SIZE-1);
3840
3841                 info->statctrl_offset    = info->phys_statctrl_base & (PAGE_SIZE-1);
3842                 info->phys_statctrl_base &= ~(PAGE_SIZE-1);
3843
3844                 info->bus_type = MGSL_BUS_TYPE_PCI;
3845                 info->irq_flags = IRQF_SHARED;
3846
3847                 setup_timer(&info->tx_timer, tx_timeout, (unsigned long)info);
3848                 setup_timer(&info->status_timer, status_timeout,
3849                                 (unsigned long)info);
3850
3851                 /* Store the PCI9050 misc control register value because a flaw
3852                  * in the PCI9050 prevents LCR registers from being read if
3853                  * BIOS assigns an LCR base address with bit 7 set.
3854                  *
3855                  * Only the misc control register is accessed for which only
3856                  * write access is needed, so set an initial value and change
3857                  * bits to the device instance data as we write the value
3858                  * to the actual misc control register.
3859                  */
3860                 info->misc_ctrl_value = 0x087e4546;
3861
3862                 /* initial port state is unknown - if startup errors
3863                  * occur, init_error will be set to indicate the
3864                  * problem. Once the port is fully initialized,
3865                  * this value will be set to 0 to indicate the
3866                  * port is available.
3867                  */
3868                 info->init_error = -1;
3869         }
3870
3871         return info;
3872 }
3873
3874 static void device_init(int adapter_num, struct pci_dev *pdev)
3875 {
3876         SLMP_INFO *port_array[SCA_MAX_PORTS];
3877         int port;
3878
3879         /* allocate device instances for up to SCA_MAX_PORTS devices */
3880         for ( port = 0; port < SCA_MAX_PORTS; ++port ) {
3881                 port_array[port] = alloc_dev(adapter_num,port,pdev);
3882                 if( port_array[port] == NULL ) {
3883                         for ( --port; port >= 0; --port )
3884                                 kfree(port_array[port]);
3885                         return;
3886                 }
3887         }
3888
3889         /* give copy of port_array to all ports and add to device list  */
3890         for ( port = 0; port < SCA_MAX_PORTS; ++port ) {
3891                 memcpy(port_array[port]->port_array,port_array,sizeof(port_array));
3892                 add_device( port_array[port] );
3893                 spin_lock_init(&port_array[port]->lock);
3894         }
3895
3896         /* Allocate and claim adapter resources */
3897         if ( !claim_resources(port_array[0]) ) {
3898
3899                 alloc_dma_bufs(port_array[0]);
3900
3901                 /* copy resource information from first port to others */
3902                 for ( port = 1; port < SCA_MAX_PORTS; ++port ) {
3903                         port_array[port]->lock  = port_array[0]->lock;
3904                         port_array[port]->irq_level     = port_array[0]->irq_level;
3905                         port_array[port]->memory_base   = port_array[0]->memory_base;
3906                         port_array[port]->sca_base      = port_array[0]->sca_base;
3907                         port_array[port]->statctrl_base = port_array[0]->statctrl_base;
3908                         port_array[port]->lcr_base      = port_array[0]->lcr_base;
3909                         alloc_dma_bufs(port_array[port]);
3910                 }
3911
3912                 if ( request_irq(port_array[0]->irq_level,
3913                                         synclinkmp_interrupt,
3914                                         port_array[0]->irq_flags,
3915                                         port_array[0]->device_name,
3916                                         port_array[0]) < 0 ) {
3917                         printk( "%s(%d):%s Cant request interrupt, IRQ=%d\n",
3918                                 __FILE__,__LINE__,
3919                                 port_array[0]->device_name,
3920                                 port_array[0]->irq_level );
3921                 }
3922                 else {
3923                         port_array[0]->irq_requested = true;
3924                         adapter_test(port_array[0]);
3925                 }
3926         }
3927 }
3928
3929 static const struct tty_operations ops = {
3930         .open = open,
3931         .close = close,
3932         .write = write,
3933         .put_char = put_char,
3934         .flush_chars = flush_chars,
3935         .write_room = write_room,
3936         .chars_in_buffer = chars_in_buffer,
3937         .flush_buffer = flush_buffer,
3938         .ioctl = ioctl,
3939         .throttle = throttle,
3940         .unthrottle = unthrottle,
3941         .send_xchar = send_xchar,
3942         .break_ctl = set_break,
3943         .wait_until_sent = wait_until_sent,
3944         .read_proc = read_proc,
3945         .set_termios = set_termios,
3946         .stop = tx_hold,
3947         .start = tx_release,
3948         .hangup = hangup,
3949         .tiocmget = tiocmget,
3950         .tiocmset = tiocmset,
3951 };
3952
3953 static void synclinkmp_cleanup(void)
3954 {
3955         int rc;
3956         SLMP_INFO *info;
3957         SLMP_INFO *tmp;
3958
3959         printk("Unloading %s %s\n", driver_name, driver_version);
3960
3961         if (serial_driver) {
3962                 if ((rc = tty_unregister_driver(serial_driver)))
3963                         printk("%s(%d) failed to unregister tty driver err=%d\n",
3964                                __FILE__,__LINE__,rc);
3965                 put_tty_driver(serial_driver);
3966         }
3967
3968         /* reset devices */
3969         info = synclinkmp_device_list;
3970         while(info) {
3971                 reset_port(info);
3972                 info = info->next_device;
3973         }
3974
3975         /* release devices */
3976         info = synclinkmp_device_list;
3977         while(info) {
3978 #if SYNCLINK_GENERIC_HDLC
3979                 hdlcdev_exit(info);
3980 #endif
3981                 free_dma_bufs(info);
3982                 free_tmp_rx_buf(info);
3983                 if ( info->port_num == 0 ) {
3984                         if (info->sca_base)
3985                                 write_reg(info, LPR, 1); /* set low power mode */
3986                         release_resources(info);
3987                 }
3988                 tmp = info;
3989                 info = info->next_device;
3990                 kfree(tmp);
3991         }
3992
3993         pci_unregister_driver(&synclinkmp_pci_driver);
3994 }
3995
3996 /* Driver initialization entry point.
3997  */
3998
3999 static int __init synclinkmp_init(void)
4000 {
4001         int rc;
4002
4003         if (break_on_load) {
4004                 synclinkmp_get_text_ptr();
4005                 BREAKPOINT();
4006         }
4007
4008         printk("%s %s\n", driver_name, driver_version);
4009
4010         if ((rc = pci_register_driver(&synclinkmp_pci_driver)) < 0) {
4011                 printk("%s:failed to register PCI driver, error=%d\n",__FILE__,rc);
4012                 return rc;
4013         }
4014
4015         serial_driver = alloc_tty_driver(128);
4016         if (!serial_driver) {
4017                 rc = -ENOMEM;
4018                 goto error;
4019         }
4020
4021         /* Initialize the tty_driver structure */
4022
4023         serial_driver->owner = THIS_MODULE;
4024         serial_driver->driver_name = "synclinkmp";
4025         serial_driver->name = "ttySLM";
4026         serial_driver->major = ttymajor;
4027         serial_driver->minor_start = 64;
4028         serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
4029         serial_driver->subtype = SERIAL_TYPE_NORMAL;
4030         serial_driver->init_termios = tty_std_termios;
4031         serial_driver->init_termios.c_cflag =
4032                 B9600 | CS8 | CREAD | HUPCL | CLOCAL;
4033         serial_driver->init_termios.c_ispeed = 9600;
4034         serial_driver->init_termios.c_ospeed = 9600;
4035         serial_driver->flags = TTY_DRIVER_REAL_RAW;
4036         tty_set_operations(serial_driver, &ops);
4037         if ((rc = tty_register_driver(serial_driver)) < 0) {
4038                 printk("%s(%d):Couldn't register serial driver\n",
4039                         __FILE__,__LINE__);
4040                 put_tty_driver(serial_driver);
4041                 serial_driver = NULL;
4042                 goto error;
4043         }
4044
4045         printk("%s %s, tty major#%d\n",
4046                 driver_name, driver_version,
4047                 serial_driver->major);
4048
4049         return 0;
4050
4051 error:
4052         synclinkmp_cleanup();
4053         return rc;
4054 }
4055
4056 static void __exit synclinkmp_exit(void)
4057 {
4058         synclinkmp_cleanup();
4059 }
4060
4061 module_init(synclinkmp_init);
4062 module_exit(synclinkmp_exit);
4063
4064 /* Set the port for internal loopback mode.
4065  * The TxCLK and RxCLK signals are generated from the BRG and
4066  * the TxD is looped back to the RxD internally.
4067  */
4068 static void enable_loopback(SLMP_INFO *info, int enable)
4069 {
4070         if (enable) {
4071                 /* MD2 (Mode Register 2)
4072                  * 01..00  CNCT<1..0> Channel Connection 11=Local Loopback
4073                  */
4074                 write_reg(info, MD2, (unsigned char)(read_reg(info, MD2) | (BIT1 + BIT0)));
4075
4076                 /* degate external TxC clock source */
4077                 info->port_array[0]->ctrlreg_value |= (BIT0 << (info->port_num * 2));
4078                 write_control_reg(info);
4079
4080                 /* RXS/TXS (Rx/Tx clock source)
4081                  * 07      Reserved, must be 0
4082                  * 06..04  Clock Source, 100=BRG
4083                  * 03..00  Clock Divisor, 0000=1
4084                  */
4085                 write_reg(info, RXS, 0x40);
4086                 write_reg(info, TXS, 0x40);
4087
4088         } else {
4089                 /* MD2 (Mode Register 2)
4090                  * 01..00  CNCT<1..0> Channel connection, 0=normal
4091                  */
4092                 write_reg(info, MD2, (unsigned char)(read_reg(info, MD2) & ~(BIT1 + BIT0)));
4093
4094                 /* RXS/TXS (Rx/Tx clock source)
4095                  * 07      Reserved, must be 0
4096                  * 06..04  Clock Source, 000=RxC/TxC Pin
4097                  * 03..00  Clock Divisor, 0000=1
4098                  */
4099                 write_reg(info, RXS, 0x00);
4100                 write_reg(info, TXS, 0x00);
4101         }
4102
4103         /* set LinkSpeed if available, otherwise default to 2Mbps */
4104         if (info->params.clock_speed)
4105                 set_rate(info, info->params.clock_speed);
4106         else
4107                 set_rate(info, 3686400);
4108 }
4109
4110 /* Set the baud rate register to the desired speed
4111  *
4112  *      data_rate       data rate of clock in bits per second
4113  *                      A data rate of 0 disables the AUX clock.
4114  */
4115 static void set_rate( SLMP_INFO *info, u32 data_rate )
4116 {
4117         u32 TMCValue;
4118         unsigned char BRValue;
4119         u32 Divisor=0;
4120
4121         /* fBRG = fCLK/(TMC * 2^BR)
4122          */
4123         if (data_rate != 0) {
4124                 Divisor = 14745600/data_rate;
4125                 if (!Divisor)
4126                         Divisor = 1;
4127
4128                 TMCValue = Divisor;
4129
4130                 BRValue = 0;
4131                 if (TMCValue != 1 && TMCValue != 2) {
4132                         /* BRValue of 0 provides 50/50 duty cycle *only* when
4133                          * TMCValue is 1 or 2. BRValue of 1 to 9 always provides
4134                          * 50/50 duty cycle.
4135                          */
4136                         BRValue = 1;
4137                         TMCValue >>= 1;
4138                 }
4139
4140                 /* while TMCValue is too big for TMC register, divide
4141                  * by 2 and increment BR exponent.
4142                  */
4143                 for(; TMCValue > 256 && BRValue < 10; BRValue++)
4144                         TMCValue >>= 1;
4145
4146                 write_reg(info, TXS,
4147                         (unsigned char)((read_reg(info, TXS) & 0xf0) | BRValue));
4148                 write_reg(info, RXS,
4149                         (unsigned char)((read_reg(info, RXS) & 0xf0) | BRValue));
4150                 write_reg(info, TMC, (unsigned char)TMCValue);
4151         }
4152         else {
4153                 write_reg(info, TXS,0);
4154                 write_reg(info, RXS,0);
4155                 write_reg(info, TMC, 0);
4156         }
4157 }
4158
4159 /* Disable receiver
4160  */
4161 static void rx_stop(SLMP_INFO *info)
4162 {
4163         if (debug_level >= DEBUG_LEVEL_ISR)
4164                 printk("%s(%d):%s rx_stop()\n",
4165                          __FILE__,__LINE__, info->device_name );
4166
4167         write_reg(info, CMD, RXRESET);
4168
4169         info->ie0_value &= ~RXRDYE;
4170         write_reg(info, IE0, info->ie0_value);  /* disable Rx data interrupts */
4171
4172         write_reg(info, RXDMA + DSR, 0);        /* disable Rx DMA */
4173         write_reg(info, RXDMA + DCMD, SWABORT); /* reset/init Rx DMA */
4174         write_reg(info, RXDMA + DIR, 0);        /* disable Rx DMA interrupts */
4175
4176         info->rx_enabled = false;
4177         info->rx_overflow = false;
4178 }
4179
4180 /* enable the receiver
4181  */
4182 static void rx_start(SLMP_INFO *info)
4183 {
4184         int i;
4185
4186         if (debug_level >= DEBUG_LEVEL_ISR)
4187                 printk("%s(%d):%s rx_start()\n",
4188                          __FILE__,__LINE__, info->device_name );
4189
4190         write_reg(info, CMD, RXRESET);
4191
4192         if ( info->params.mode == MGSL_MODE_HDLC ) {
4193                 /* HDLC, disabe IRQ on rxdata */
4194                 info->ie0_value &= ~RXRDYE;
4195                 write_reg(info, IE0, info->ie0_value);
4196
4197                 /* Reset all Rx DMA buffers and program rx dma */
4198                 write_reg(info, RXDMA + DSR, 0);                /* disable Rx DMA */
4199                 write_reg(info, RXDMA + DCMD, SWABORT); /* reset/init Rx DMA */
4200
4201                 for (i = 0; i < info->rx_buf_count; i++) {
4202                         info->rx_buf_list[i].status = 0xff;
4203
4204                         // throttle to 4 shared memory writes at a time to prevent
4205                         // hogging local bus (keep latency time for DMA requests low).
4206                         if (!(i % 4))
4207                                 read_status_reg(info);
4208                 }
4209                 info->current_rx_buf = 0;
4210
4211                 /* set current/1st descriptor address */
4212                 write_reg16(info, RXDMA + CDA,
4213                         info->rx_buf_list_ex[0].phys_entry);
4214
4215                 /* set new last rx descriptor address */
4216                 write_reg16(info, RXDMA + EDA,
4217                         info->rx_buf_list_ex[info->rx_buf_count - 1].phys_entry);
4218
4219                 /* set buffer length (shared by all rx dma data buffers) */
4220                 write_reg16(info, RXDMA + BFL, SCABUFSIZE);
4221
4222                 write_reg(info, RXDMA + DIR, 0x60);     /* enable Rx DMA interrupts (EOM/BOF) */
4223                 write_reg(info, RXDMA + DSR, 0xf2);     /* clear Rx DMA IRQs, enable Rx DMA */
4224         } else {
4225                 /* async, enable IRQ on rxdata */
4226                 info->ie0_value |= RXRDYE;
4227                 write_reg(info, IE0, info->ie0_value);
4228         }
4229
4230         write_reg(info, CMD, RXENABLE);
4231
4232         info->rx_overflow = false;
4233         info->rx_enabled = true;
4234 }
4235
4236 /* Enable the transmitter and send a transmit frame if
4237  * one is loaded in the DMA buffers.
4238  */
4239 static void tx_start(SLMP_INFO *info)
4240 {
4241         if (debug_level >= DEBUG_LEVEL_ISR)
4242                 printk("%s(%d):%s tx_start() tx_count=%d\n",
4243                          __FILE__,__LINE__, info->device_name,info->tx_count );
4244
4245         if (!info->tx_enabled ) {
4246                 write_reg(info, CMD, TXRESET);
4247                 write_reg(info, CMD, TXENABLE);
4248                 info->tx_enabled = true;
4249         }
4250
4251         if ( info->tx_count ) {
4252
4253                 /* If auto RTS enabled and RTS is inactive, then assert */
4254                 /* RTS and set a flag indicating that the driver should */
4255                 /* negate RTS when the transmission completes. */
4256
4257                 info->drop_rts_on_tx_done = false;
4258
4259                 if (info->params.mode != MGSL_MODE_ASYNC) {
4260
4261                         if ( info->params.flags & HDLC_FLAG_AUTO_RTS ) {
4262                                 get_signals( info );
4263                                 if ( !(info->serial_signals & SerialSignal_RTS) ) {
4264                                         info->serial_signals |= SerialSignal_RTS;
4265                                         set_signals( info );
4266                                         info->drop_rts_on_tx_done = true;
4267                                 }
4268                         }
4269
4270                         write_reg16(info, TRC0,
4271                                 (unsigned short)(((tx_negate_fifo_level-1)<<8) + tx_active_fifo_level));
4272
4273                         write_reg(info, TXDMA + DSR, 0);                /* disable DMA channel */
4274                         write_reg(info, TXDMA + DCMD, SWABORT); /* reset/init DMA channel */
4275
4276                         /* set TX CDA (current descriptor address) */
4277                         write_reg16(info, TXDMA + CDA,
4278                                 info->tx_buf_list_ex[0].phys_entry);
4279
4280                         /* set TX EDA (last descriptor address) */
4281                         write_reg16(info, TXDMA + EDA,
4282                                 info->tx_buf_list_ex[info->last_tx_buf].phys_entry);
4283
4284                         /* enable underrun IRQ */
4285                         info->ie1_value &= ~IDLE;
4286                         info->ie1_value |= UDRN;
4287                         write_reg(info, IE1, info->ie1_value);
4288                         write_reg(info, SR1, (unsigned char)(IDLE + UDRN));
4289
4290                         write_reg(info, TXDMA + DIR, 0x40);             /* enable Tx DMA interrupts (EOM) */
4291                         write_reg(info, TXDMA + DSR, 0xf2);             /* clear Tx DMA IRQs, enable Tx DMA */
4292
4293                         mod_timer(&info->tx_timer, jiffies +
4294                                         msecs_to_jiffies(5000));
4295                 }
4296                 else {
4297                         tx_load_fifo(info);
4298                         /* async, enable IRQ on txdata */
4299                         info->ie0_value |= TXRDYE;
4300                         write_reg(info, IE0, info->ie0_value);
4301                 }
4302
4303                 info->tx_active = true;
4304         }
4305 }
4306
4307 /* stop the transmitter and DMA
4308  */
4309 static void tx_stop( SLMP_INFO *info )
4310 {
4311         if (debug_level >= DEBUG_LEVEL_ISR)
4312                 printk("%s(%d):%s tx_stop()\n",
4313                          __FILE__,__LINE__, info->device_name );
4314
4315         del_timer(&info->tx_timer);
4316
4317         write_reg(info, TXDMA + DSR, 0);                /* disable DMA channel */
4318         write_reg(info, TXDMA + DCMD, SWABORT); /* reset/init DMA channel */
4319
4320         write_reg(info, CMD, TXRESET);
4321
4322         info->ie1_value &= ~(UDRN + IDLE);
4323         write_reg(info, IE1, info->ie1_value);  /* disable tx status interrupts */
4324         write_reg(info, SR1, (unsigned char)(IDLE + UDRN));     /* clear pending */
4325
4326         info->ie0_value &= ~TXRDYE;
4327         write_reg(info, IE0, info->ie0_value);  /* disable tx data interrupts */
4328
4329         info->tx_enabled = false;
4330         info->tx_active = false;
4331 }
4332
4333 /* Fill the transmit FIFO until the FIFO is full or
4334  * there is no more data to load.
4335  */
4336 static void tx_load_fifo(SLMP_INFO *info)
4337 {
4338         u8 TwoBytes[2];
4339
4340         /* do nothing is now tx data available and no XON/XOFF pending */
4341
4342         if ( !info->tx_count && !info->x_char )
4343                 return;
4344
4345         /* load the Transmit FIFO until FIFOs full or all data sent */
4346
4347         while( info->tx_count && (read_reg(info,SR0) & BIT1) ) {
4348
4349                 /* there is more space in the transmit FIFO and */
4350                 /* there is more data in transmit buffer */
4351
4352                 if ( (info->tx_count > 1) && !info->x_char ) {
4353                         /* write 16-bits */
4354                         TwoBytes[0] = info->tx_buf[info->tx_get++];
4355                         if (info->tx_get >= info->max_frame_size)
4356                                 info->tx_get -= info->max_frame_size;
4357                         TwoBytes[1] = info->tx_buf[info->tx_get++];
4358                         if (info->tx_get >= info->max_frame_size)
4359                                 info->tx_get -= info->max_frame_size;
4360
4361                         write_reg16(info, TRB, *((u16 *)TwoBytes));
4362
4363                         info->tx_count -= 2;
4364                         info->icount.tx += 2;
4365                 } else {
4366                         /* only 1 byte left to transmit or 1 FIFO slot left */
4367
4368                         if (info->x_char) {
4369                                 /* transmit pending high priority char */
4370                                 write_reg(info, TRB, info->x_char);
4371                                 info->x_char = 0;
4372                         } else {
4373                                 write_reg(info, TRB, info->tx_buf[info->tx_get++]);
4374                                 if (info->tx_get >= info->max_frame_size)
4375                                         info->tx_get -= info->max_frame_size;
4376                                 info->tx_count--;
4377                         }
4378                         info->icount.tx++;
4379                 }
4380         }
4381 }
4382
4383 /* Reset a port to a known state
4384  */
4385 static void reset_port(SLMP_INFO *info)
4386 {
4387         if (info->sca_base) {
4388
4389                 tx_stop(info);
4390                 rx_stop(info);
4391
4392                 info->serial_signals &= ~(SerialSignal_DTR + SerialSignal_RTS);
4393                 set_signals(info);
4394
4395                 /* disable all port interrupts */
4396                 info->ie0_value = 0;
4397                 info->ie1_value = 0;
4398                 info->ie2_value = 0;
4399                 write_reg(info, IE0, info->ie0_value);
4400                 write_reg(info, IE1, info->ie1_value);
4401                 write_reg(info, IE2, info->ie2_value);
4402
4403                 write_reg(info, CMD, CHRESET);
4404         }
4405 }
4406
4407 /* Reset all the ports to a known state.
4408  */
4409 static void reset_adapter(SLMP_INFO *info)
4410 {
4411         int i;
4412
4413         for ( i=0; i < SCA_MAX_PORTS; ++i) {
4414                 if (info->port_array[i])
4415                         reset_port(info->port_array[i]);
4416         }
4417 }
4418
4419 /* Program port for asynchronous communications.
4420  */
4421 static void async_mode(SLMP_INFO *info)
4422 {
4423
4424         unsigned char RegValue;
4425
4426         tx_stop(info);
4427         rx_stop(info);
4428
4429         /* MD0, Mode Register 0
4430          *
4431          * 07..05  PRCTL<2..0>, Protocol Mode, 000=async
4432          * 04      AUTO, Auto-enable (RTS/CTS/DCD)
4433          * 03      Reserved, must be 0
4434          * 02      CRCCC, CRC Calculation, 0=disabled
4435          * 01..00  STOP<1..0> Stop bits (00=1,10=2)
4436          *
4437          * 0000 0000
4438          */
4439         RegValue = 0x00;
4440         if (info->params.stop_bits != 1)
4441                 RegValue |= BIT1;
4442         write_reg(info, MD0, RegValue);
4443
4444         /* MD1, Mode Register 1
4445          *
4446          * 07..06  BRATE<1..0>, bit rate, 00=1/1 01=1/16 10=1/32 11=1/64
4447          * 05..04  TXCHR<1..0>, tx char size, 00=8 bits,01=7,10=6,11=5
4448          * 03..02  RXCHR<1..0>, rx char size
4449          * 01..00  PMPM<1..0>, Parity mode, 00=none 10=even 11=odd
4450          *
4451          * 0100 0000
4452          */
4453         RegValue = 0x40;
4454         switch (info->params.data_bits) {
4455         case 7: RegValue |= BIT4 + BIT2; break;
4456         case 6: RegValue |= BIT5 + BIT3; break;
4457         case 5: RegValue |= BIT5 + BIT4 + BIT3 + BIT2; break;
4458         }
4459         if (info->params.parity != ASYNC_PARITY_NONE) {
4460                 RegValue |= BIT1;
4461                 if (info->params.parity == ASYNC_PARITY_ODD)
4462                         RegValue |= BIT0;
4463         }
4464         write_reg(info, MD1, RegValue);
4465
4466         /* MD2, Mode Register 2
4467          *
4468          * 07..02  Reserved, must be 0
4469          * 01..00  CNCT<1..0> Channel connection, 00=normal 11=local loopback
4470          *
4471          * 0000 0000
4472          */
4473         RegValue = 0x00;
4474         if (info->params.loopback)
4475                 RegValue |= (BIT1 + BIT0);
4476         write_reg(info, MD2, RegValue);
4477
4478         /* RXS, Receive clock source
4479          *
4480          * 07      Reserved, must be 0
4481          * 06..04  RXCS<2..0>, clock source, 000=RxC Pin, 100=BRG, 110=DPLL
4482          * 03..00  RXBR<3..0>, rate divisor, 0000=1
4483          */
4484         RegValue=BIT6;
4485         write_reg(info, RXS, RegValue);
4486
4487         /* TXS, Transmit clock source
4488          *
4489          * 07      Reserved, must be 0
4490          * 06..04  RXCS<2..0>, clock source, 000=TxC Pin, 100=BRG, 110=Receive Clock
4491          * 03..00  RXBR<3..0>, rate divisor, 0000=1
4492          */
4493         RegValue=BIT6;
4494         write_reg(info, TXS, RegValue);
4495
4496         /* Control Register
4497          *
4498          * 6,4,2,0  CLKSEL<3..0>, 0 = TcCLK in, 1 = Auxclk out
4499          */
4500         info->port_array[0]->ctrlreg_value |= (BIT0 << (info->port_num * 2));
4501         write_control_reg(info);
4502
4503         tx_set_idle(info);
4504
4505         /* RRC Receive Ready Control 0
4506          *
4507          * 07..05  Reserved, must be 0
4508          * 04..00  RRC<4..0> Rx FIFO trigger active 0x00 = 1 byte
4509          */
4510         write_reg(info, RRC, 0x00);
4511
4512         /* TRC0 Transmit Ready Control 0
4513          *
4514          * 07..05  Reserved, must be 0
4515          * 04..00  TRC<4..0> Tx FIFO trigger active 0x10 = 16 bytes
4516          */
4517         write_reg(info, TRC0, 0x10);
4518
4519         /* TRC1 Transmit Ready Control 1
4520          *
4521          * 07..05  Reserved, must be 0
4522          * 04..00  TRC<4..0> Tx FIFO trigger inactive 0x1e = 31 bytes (full-1)
4523          */
4524         write_reg(info, TRC1, 0x1e);
4525
4526         /* CTL, MSCI control register
4527          *
4528          * 07..06  Reserved, set to 0
4529          * 05      UDRNC, underrun control, 0=abort 1=CRC+flag (HDLC/BSC)
4530          * 04      IDLC, idle control, 0=mark 1=idle register
4531          * 03      BRK, break, 0=off 1 =on (async)
4532          * 02      SYNCLD, sync char load enable (BSC) 1=enabled
4533          * 01      GOP, go active on poll (LOOP mode) 1=enabled
4534          * 00      RTS, RTS output control, 0=active 1=inactive
4535          *
4536          * 0001 0001
4537          */
4538         RegValue = 0x10;
4539         if (!(info->serial_signals & SerialSignal_RTS))
4540                 RegValue |= 0x01;
4541         write_reg(info, CTL, RegValue);
4542
4543         /* enable status interrupts */
4544         info->ie0_value |= TXINTE + RXINTE;
4545         write_reg(info, IE0, info->ie0_value);
4546
4547         /* enable break detect interrupt */
4548         info->ie1_value = BRKD;
4549         write_reg(info, IE1, info->ie1_value);
4550
4551         /* enable rx overrun interrupt */
4552         info->ie2_value = OVRN;
4553         write_reg(info, IE2, info->ie2_value);
4554
4555         set_rate( info, info->params.data_rate * 16 );
4556 }
4557
4558 /* Program the SCA for HDLC communications.
4559  */
4560 static void hdlc_mode(SLMP_INFO *info)
4561 {
4562         unsigned char RegValue;
4563         u32 DpllDivisor;
4564
4565         // Can't use DPLL because SCA outputs recovered clock on RxC when
4566         // DPLL mode selected. This causes output contention with RxC receiver.
4567         // Use of DPLL would require external hardware to disable RxC receiver
4568         // when DPLL mode selected.
4569         info->params.flags &= ~(HDLC_FLAG_TXC_DPLL + HDLC_FLAG_RXC_DPLL);
4570
4571         /* disable DMA interrupts */
4572         write_reg(info, TXDMA + DIR, 0);
4573         write_reg(info, RXDMA + DIR, 0);
4574
4575         /* MD0, Mode Register 0
4576          *
4577          * 07..05  PRCTL<2..0>, Protocol Mode, 100=HDLC
4578          * 04      AUTO, Auto-enable (RTS/CTS/DCD)
4579          * 03      Reserved, must be 0
4580          * 02      CRCCC, CRC Calculation, 1=enabled
4581          * 01      CRC1, CRC selection, 0=CRC-16,1=CRC-CCITT-16
4582          * 00      CRC0, CRC initial value, 1 = all 1s
4583          *
4584          * 1000 0001
4585          */
4586         RegValue = 0x81;
4587         if (info->params.flags & HDLC_FLAG_AUTO_CTS)
4588                 RegValue |= BIT4;
4589         if (info->params.flags & HDLC_FLAG_AUTO_DCD)
4590                 RegValue |= BIT4;
4591         if (info->params.crc_type == HDLC_CRC_16_CCITT)
4592                 RegValue |= BIT2 + BIT1;
4593         write_reg(info, MD0, RegValue);
4594
4595         /* MD1, Mode Register 1
4596          *
4597          * 07..06  ADDRS<1..0>, Address detect, 00=no addr check
4598          * 05..04  TXCHR<1..0>, tx char size, 00=8 bits
4599          * 03..02  RXCHR<1..0>, rx char size, 00=8 bits
4600          * 01..00  PMPM<1..0>, Parity mode, 00=no parity
4601          *
4602          * 0000 0000
4603          */
4604         RegValue = 0x00;
4605         write_reg(info, MD1, RegValue);
4606
4607         /* MD2, Mode Register 2
4608          *
4609          * 07      NRZFM, 0=NRZ, 1=FM
4610          * 06..05  CODE<1..0> Encoding, 00=NRZ
4611          * 04..03  DRATE<1..0> DPLL Divisor, 00=8
4612          * 02      Reserved, must be 0
4613          * 01..00  CNCT<1..0> Channel connection, 0=normal
4614          *
4615          * 0000 0000
4616          */
4617         RegValue = 0x00;
4618         switch(info->params.encoding) {
4619         case HDLC_ENCODING_NRZI:          RegValue |= BIT5; break;
4620         case HDLC_ENCODING_BIPHASE_MARK:  RegValue |= BIT7 + BIT5; break; /* aka FM1 */
4621         case HDLC_ENCODING_BIPHASE_SPACE: RegValue |= BIT7 + BIT6; break; /* aka FM0 */
4622         case HDLC_ENCODING_BIPHASE_LEVEL: RegValue |= BIT7; break;      /* aka Manchester */
4623 #if 0
4624         case HDLC_ENCODING_NRZB:                                        /* not supported */
4625         case HDLC_ENCODING_NRZI_MARK:                                   /* not supported */
4626         case HDLC_ENCODING_DIFF_BIPHASE_LEVEL:                          /* not supported */
4627 #endif
4628         }
4629         if ( info->params.flags & HDLC_FLAG_DPLL_DIV16 ) {
4630                 DpllDivisor = 16;
4631                 RegValue |= BIT3;
4632         } else if ( info->params.flags & HDLC_FLAG_DPLL_DIV8 ) {
4633                 DpllDivisor = 8;
4634         } else {
4635                 DpllDivisor = 32;
4636                 RegValue |= BIT4;
4637         }
4638         write_reg(info, MD2, RegValue);
4639
4640
4641         /* RXS, Receive clock source
4642          *
4643          * 07      Reserved, must be 0
4644          * 06..04  RXCS<2..0>, clock source, 000=RxC Pin, 100=BRG, 110=DPLL
4645          * 03..00  RXBR<3..0>, rate divisor, 0000=1
4646          */
4647         RegValue=0;
4648         if (info->params.flags & HDLC_FLAG_RXC_BRG)
4649                 RegValue |= BIT6;
4650         if (info->params.flags & HDLC_FLAG_RXC_DPLL)
4651                 RegValue |= BIT6 + BIT5;
4652         write_reg(info, RXS, RegValue);
4653
4654         /* TXS, Transmit clock source
4655          *
4656          * 07      Reserved, must be 0
4657          * 06..04  RXCS<2..0>, clock source, 000=TxC Pin, 100=BRG, 110=Receive Clock
4658          * 03..00  RXBR<3..0>, rate divisor, 0000=1
4659          */
4660         RegValue=0;
4661         if (info->params.flags & HDLC_FLAG_TXC_BRG)
4662                 RegValue |= BIT6;
4663         if (info->params.flags & HDLC_FLAG_TXC_DPLL)
4664                 RegValue |= BIT6 + BIT5;
4665         write_reg(info, TXS, RegValue);
4666
4667         if (info->params.flags & HDLC_FLAG_RXC_DPLL)
4668                 set_rate(info, info->params.clock_speed * DpllDivisor);
4669         else
4670                 set_rate(info, info->params.clock_speed);
4671
4672         /* GPDATA (General Purpose I/O Data Register)
4673          *
4674          * 6,4,2,0  CLKSEL<3..0>, 0 = TcCLK in, 1 = Auxclk out
4675          */
4676         if (info->params.flags & HDLC_FLAG_TXC_BRG)
4677                 info->port_array[0]->ctrlreg_value |= (BIT0 << (info->port_num * 2));
4678         else
4679                 info->port_array[0]->ctrlreg_value &= ~(BIT0 << (info->port_num * 2));
4680         write_control_reg(info);
4681
4682         /* RRC Receive Ready Control 0
4683          *
4684          * 07..05  Reserved, must be 0
4685          * 04..00  RRC<4..0> Rx FIFO trigger active
4686          */
4687         write_reg(info, RRC, rx_active_fifo_level);
4688
4689         /* TRC0 Transmit Ready Control 0
4690          *
4691          * 07..05  Reserved, must be 0
4692          * 04..00  TRC<4..0> Tx FIFO trigger active
4693          */
4694         write_reg(info, TRC0, tx_active_fifo_level);
4695
4696         /* TRC1 Transmit Ready Control 1
4697          *
4698          * 07..05  Reserved, must be 0
4699          * 04..00  TRC<4..0> Tx FIFO trigger inactive 0x1f = 32 bytes (full)
4700          */
4701         write_reg(info, TRC1, (unsigned char)(tx_negate_fifo_level - 1));
4702
4703         /* DMR, DMA Mode Register
4704          *
4705          * 07..05  Reserved, must be 0
4706          * 04      TMOD, Transfer Mode: 1=chained-block
4707          * 03      Reserved, must be 0
4708          * 02      NF, Number of Frames: 1=multi-frame
4709          * 01      CNTE, Frame End IRQ Counter enable: 0=disabled
4710          * 00      Reserved, must be 0
4711          *
4712          * 0001 0100
4713          */
4714         write_reg(info, TXDMA + DMR, 0x14);
4715         write_reg(info, RXDMA + DMR, 0x14);
4716
4717         /* Set chain pointer base (upper 8 bits of 24 bit addr) */
4718         write_reg(info, RXDMA + CPB,
4719                 (unsigned char)(info->buffer_list_phys >> 16));
4720
4721         /* Set chain pointer base (upper 8 bits of 24 bit addr) */
4722         write_reg(info, TXDMA + CPB,
4723                 (unsigned char)(info->buffer_list_phys >> 16));
4724
4725         /* enable status interrupts. other code enables/disables
4726          * the individual sources for these two interrupt classes.
4727          */
4728         info->ie0_value |= TXINTE + RXINTE;
4729         write_reg(info, IE0, info->ie0_value);
4730
4731         /* CTL, MSCI control register
4732          *
4733          * 07..06  Reserved, set to 0
4734          * 05      UDRNC, underrun control, 0=abort 1=CRC+flag (HDLC/BSC)
4735          * 04      IDLC, idle control, 0=mark 1=idle register
4736          * 03      BRK, break, 0=off 1 =on (async)
4737          * 02      SYNCLD, sync char load enable (BSC) 1=enabled
4738          * 01      GOP, go active on poll (LOOP mode) 1=enabled
4739          * 00      RTS, RTS output control, 0=active 1=inactive
4740          *
4741          * 0001 0001
4742          */
4743         RegValue = 0x10;
4744         if (!(info->serial_signals & SerialSignal_RTS))
4745                 RegValue |= 0x01;
4746         write_reg(info, CTL, RegValue);
4747
4748         /* preamble not supported ! */
4749
4750         tx_set_idle(info);
4751         tx_stop(info);
4752         rx_stop(info);
4753
4754         set_rate(info, info->params.clock_speed);
4755
4756         if (info->params.loopback)
4757                 enable_loopback(info,1);
4758 }
4759
4760 /* Set the transmit HDLC idle mode
4761  */
4762 static void tx_set_idle(SLMP_INFO *info)
4763 {
4764         unsigned char RegValue = 0xff;
4765
4766         /* Map API idle mode to SCA register bits */
4767         switch(info->idle_mode) {
4768         case HDLC_TXIDLE_FLAGS:                 RegValue = 0x7e; break;
4769         case HDLC_TXIDLE_ALT_ZEROS_ONES:        RegValue = 0xaa; break;
4770         case HDLC_TXIDLE_ZEROS:                 RegValue = 0x00; break;
4771         case HDLC_TXIDLE_ONES:                  RegValue = 0xff; break;
4772         case HDLC_TXIDLE_ALT_MARK_SPACE:        RegValue = 0xaa; break;
4773         case HDLC_TXIDLE_SPACE:                 RegValue = 0x00; break;
4774         case HDLC_TXIDLE_MARK:                  RegValue = 0xff; break;
4775         }
4776
4777         write_reg(info, IDL, RegValue);
4778 }
4779
4780 /* Query the adapter for the state of the V24 status (input) signals.
4781  */
4782 static void get_signals(SLMP_INFO *info)
4783 {
4784         u16 status = read_reg(info, SR3);
4785         u16 gpstatus = read_status_reg(info);
4786         u16 testbit;
4787
4788         /* clear all serial signals except DTR and RTS */
4789         info->serial_signals &= SerialSignal_DTR + SerialSignal_RTS;
4790
4791         /* set serial signal bits to reflect MISR */
4792
4793         if (!(status & BIT3))
4794                 info->serial_signals |= SerialSignal_CTS;
4795
4796         if ( !(status & BIT2))
4797                 info->serial_signals |= SerialSignal_DCD;
4798
4799         testbit = BIT1 << (info->port_num * 2); // Port 0..3 RI is GPDATA<1,3,5,7>
4800         if (!(gpstatus & testbit))
4801                 info->serial_signals |= SerialSignal_RI;
4802
4803         testbit = BIT0 << (info->port_num * 2); // Port 0..3 DSR is GPDATA<0,2,4,6>
4804         if (!(gpstatus & testbit))
4805                 info->serial_signals |= SerialSignal_DSR;
4806 }
4807
4808 /* Set the state of DTR and RTS based on contents of
4809  * serial_signals member of device context.
4810  */
4811 static void set_signals(SLMP_INFO *info)
4812 {
4813         unsigned char RegValue;
4814         u16 EnableBit;
4815
4816         RegValue = read_reg(info, CTL);
4817         if (info->serial_signals & SerialSignal_RTS)
4818                 RegValue &= ~BIT0;
4819         else
4820                 RegValue |= BIT0;
4821         write_reg(info, CTL, RegValue);
4822
4823         // Port 0..3 DTR is ctrl reg <1,3,5,7>
4824         EnableBit = BIT1 << (info->port_num*2);
4825         if (info->serial_signals & SerialSignal_DTR)
4826                 info->port_array[0]->ctrlreg_value &= ~EnableBit;
4827         else
4828                 info->port_array[0]->ctrlreg_value |= EnableBit;
4829         write_control_reg(info);
4830 }
4831
4832 /*******************/
4833 /* DMA Buffer Code */
4834 /*******************/
4835
4836 /* Set the count for all receive buffers to SCABUFSIZE
4837  * and set the current buffer to the first buffer. This effectively
4838  * makes all buffers free and discards any data in buffers.
4839  */
4840 static void rx_reset_buffers(SLMP_INFO *info)
4841 {
4842         rx_free_frame_buffers(info, 0, info->rx_buf_count - 1);
4843 }
4844
4845 /* Free the buffers used by a received frame
4846  *
4847  * info   pointer to device instance data
4848  * first  index of 1st receive buffer of frame
4849  * last   index of last receive buffer of frame
4850  */
4851 static void rx_free_frame_buffers(SLMP_INFO *info, unsigned int first, unsigned int last)
4852 {
4853         bool done = false;
4854
4855         while(!done) {
4856                 /* reset current buffer for reuse */
4857                 info->rx_buf_list[first].status = 0xff;
4858
4859                 if (first == last) {
4860                         done = true;
4861                         /* set new last rx descriptor address */
4862                         write_reg16(info, RXDMA + EDA, info->rx_buf_list_ex[first].phys_entry);
4863                 }
4864
4865                 first++;
4866                 if (first == info->rx_buf_count)
4867                         first = 0;
4868         }
4869
4870         /* set current buffer to next buffer after last buffer of frame */
4871         info->current_rx_buf = first;
4872 }
4873
4874 /* Return a received frame from the receive DMA buffers.
4875  * Only frames received without errors are returned.
4876  *
4877  * Return Value:        true if frame returned, otherwise false
4878  */
4879 static bool rx_get_frame(SLMP_INFO *info)
4880 {
4881         unsigned int StartIndex, EndIndex;      /* index of 1st and last buffers of Rx frame */
4882         unsigned short status;
4883         unsigned int framesize = 0;
4884         bool ReturnCode = false;
4885         unsigned long flags;
4886         struct tty_struct *tty = info->tty;
4887         unsigned char addr_field = 0xff;
4888         SCADESC *desc;
4889         SCADESC_EX *desc_ex;
4890
4891 CheckAgain:
4892         /* assume no frame returned, set zero length */
4893         framesize = 0;
4894         addr_field = 0xff;
4895
4896         /*
4897          * current_rx_buf points to the 1st buffer of the next available
4898          * receive frame. To find the last buffer of the frame look for
4899          * a non-zero status field in the buffer entries. (The status
4900          * field is set by the 16C32 after completing a receive frame.
4901          */
4902         StartIndex = EndIndex = info->current_rx_buf;
4903
4904         for ( ;; ) {
4905                 desc = &info->rx_buf_list[EndIndex];
4906                 desc_ex = &info->rx_buf_list_ex[EndIndex];
4907
4908                 if (desc->status == 0xff)
4909                         goto Cleanup;   /* current desc still in use, no frames available */
4910
4911                 if (framesize == 0 && info->params.addr_filter != 0xff)
4912                         addr_field = desc_ex->virt_addr[0];
4913
4914                 framesize += desc->length;
4915
4916                 /* Status != 0 means last buffer of frame */
4917                 if (desc->status)
4918                         break;
4919
4920                 EndIndex++;
4921                 if (EndIndex == info->rx_buf_count)
4922                         EndIndex = 0;
4923
4924                 if (EndIndex == info->current_rx_buf) {
4925                         /* all buffers have been 'used' but none mark      */
4926                         /* the end of a frame. Reset buffers and receiver. */
4927                         if ( info->rx_enabled ){
4928                                 spin_lock_irqsave(&info->lock,flags);
4929                                 rx_start(info);
4930                                 spin_unlock_irqrestore(&info->lock,flags);
4931                         }
4932                         goto Cleanup;
4933                 }
4934
4935         }
4936
4937         /* check status of receive frame */
4938
4939         /* frame status is byte stored after frame data
4940          *
4941          * 7 EOM (end of msg), 1 = last buffer of frame
4942          * 6 Short Frame, 1 = short frame
4943          * 5 Abort, 1 = frame aborted
4944          * 4 Residue, 1 = last byte is partial
4945          * 3 Overrun, 1 = overrun occurred during frame reception
4946          * 2 CRC,     1 = CRC error detected
4947          *
4948          */
4949         status = desc->status;
4950
4951         /* ignore CRC bit if not using CRC (bit is undefined) */
4952         /* Note:CRC is not save to data buffer */
4953         if (info->params.crc_type == HDLC_CRC_NONE)
4954                 status &= ~BIT2;
4955
4956         if (framesize == 0 ||
4957                  (addr_field != 0xff && addr_field != info->params.addr_filter)) {
4958                 /* discard 0 byte frames, this seems to occur sometime
4959                  * when remote is idling flags.
4960                  */
4961                 rx_free_frame_buffers(info, StartIndex, EndIndex);
4962                 goto CheckAgain;
4963         }
4964
4965         if (framesize < 2)
4966                 status |= BIT6;
4967
4968         if (status & (BIT6+BIT5+BIT3+BIT2)) {
4969                 /* received frame has errors,
4970                  * update counts and mark frame size as 0
4971                  */
4972                 if (status & BIT6)
4973                         info->icount.rxshort++;
4974                 else if (status & BIT5)
4975                         info->icount.rxabort++;
4976                 else if (status & BIT3)
4977                         info->icount.rxover++;
4978                 else
4979                         info->icount.rxcrc++;
4980
4981                 framesize = 0;
4982 #if SYNCLINK_GENERIC_HDLC
4983                 {
4984                         struct net_device_stats *stats = hdlc_stats(info->netdev);
4985                         stats->rx_errors++;
4986                         stats->rx_frame_errors++;
4987                 }
4988 #endif
4989         }
4990
4991         if ( debug_level >= DEBUG_LEVEL_BH )
4992                 printk("%s(%d):%s rx_get_frame() status=%04X size=%d\n",
4993                         __FILE__,__LINE__,info->device_name,status,framesize);
4994
4995         if ( debug_level >= DEBUG_LEVEL_DATA )
4996                 trace_block(info,info->rx_buf_list_ex[StartIndex].virt_addr,
4997                         min_t(int, framesize,SCABUFSIZE),0);
4998
4999         if (framesize) {
5000                 if (framesize > info->max_frame_size)
5001                         info->icount.rxlong++;
5002                 else {
5003                         /* copy dma buffer(s) to contiguous intermediate buffer */
5004                         int copy_count = framesize;
5005                         int index = StartIndex;
5006                         unsigned char *ptmp = info->tmp_rx_buf;
5007                         info->tmp_rx_buf_count = framesize;
5008
5009                         info->icount.rxok++;
5010
5011                         while(copy_count) {
5012                                 int partial_count = min(copy_count,SCABUFSIZE);
5013                                 memcpy( ptmp,
5014                                         info->rx_buf_list_ex[index].virt_addr,
5015                                         partial_count );
5016                                 ptmp += partial_count;
5017                                 copy_count -= partial_count;
5018
5019                                 if ( ++index == info->rx_buf_count )
5020                                         index = 0;
5021                         }
5022
5023 #if SYNCLINK_GENERIC_HDLC
5024                         if (info->netcount)
5025                                 hdlcdev_rx(info,info->tmp_rx_buf,framesize);
5026                         else
5027 #endif
5028                                 ldisc_receive_buf(tty,info->tmp_rx_buf,
5029                                                   info->flag_buf, framesize);
5030                 }
5031         }
5032         /* Free the buffers used by this frame. */
5033         rx_free_frame_buffers( info, StartIndex, EndIndex );
5034
5035         ReturnCode = true;
5036
5037 Cleanup:
5038         if ( info->rx_enabled && info->rx_overflow ) {
5039                 /* Receiver is enabled, but needs to restarted due to
5040                  * rx buffer overflow. If buffers are empty, restart receiver.
5041                  */
5042                 if (info->rx_buf_list[EndIndex].status == 0xff) {
5043                         spin_lock_irqsave(&info->lock,flags);
5044                         rx_start(info);
5045                         spin_unlock_irqrestore(&info->lock,flags);
5046                 }
5047         }
5048
5049         return ReturnCode;
5050 }
5051
5052 /* load the transmit DMA buffer with data
5053  */
5054 static void tx_load_dma_buffer(SLMP_INFO *info, const char *buf, unsigned int count)
5055 {
5056         unsigned short copy_count;
5057         unsigned int i = 0;
5058         SCADESC *desc;
5059         SCADESC_EX *desc_ex;
5060
5061         if ( debug_level >= DEBUG_LEVEL_DATA )
5062                 trace_block(info,buf, min_t(int, count,SCABUFSIZE), 1);
5063
5064         /* Copy source buffer to one or more DMA buffers, starting with
5065          * the first transmit dma buffer.
5066          */
5067         for(i=0;;)
5068         {
5069                 copy_count = min_t(unsigned short,count,SCABUFSIZE);
5070
5071                 desc = &info->tx_buf_list[i];
5072                 desc_ex = &info->tx_buf_list_ex[i];
5073
5074                 load_pci_memory(info, desc_ex->virt_addr,buf,copy_count);
5075
5076                 desc->length = copy_count;
5077                 desc->status = 0;
5078
5079                 buf += copy_count;
5080                 count -= copy_count;
5081
5082                 if (!count)
5083                         break;
5084
5085                 i++;
5086                 if (i >= info->tx_buf_count)
5087                         i = 0;
5088         }
5089
5090         info->tx_buf_list[i].status = 0x81;     /* set EOM and EOT status */
5091         info->last_tx_buf = ++i;
5092 }
5093
5094 static bool register_test(SLMP_INFO *info)
5095 {
5096         static unsigned char testval[] = {0x00, 0xff, 0xaa, 0x55, 0x69, 0x96};
5097         static unsigned int count = ARRAY_SIZE(testval);
5098         unsigned int i;
5099         bool rc = true;
5100         unsigned long flags;
5101
5102         spin_lock_irqsave(&info->lock,flags);
5103         reset_port(info);
5104
5105         /* assume failure */
5106         info->init_error = DiagStatus_AddressFailure;
5107
5108         /* Write bit patterns to various registers but do it out of */
5109         /* sync, then read back and verify values. */
5110
5111         for (i = 0 ; i < count ; i++) {
5112                 write_reg(info, TMC, testval[i]);
5113                 write_reg(info, IDL, testval[(i+1)%count]);
5114                 write_reg(info, SA0, testval[(i+2)%count]);
5115                 write_reg(info, SA1, testval[(i+3)%count]);
5116
5117                 if ( (read_reg(info, TMC) != testval[i]) ||
5118                           (read_reg(info, IDL) != testval[(i+1)%count]) ||
5119                           (read_reg(info, SA0) != testval[(i+2)%count]) ||
5120                           (read_reg(info, SA1) != testval[(i+3)%count]) )
5121                 {
5122                         rc = false;
5123                         break;
5124                 }
5125         }
5126
5127         reset_port(info);
5128         spin_unlock_irqrestore(&info->lock,flags);
5129
5130         return rc;
5131 }
5132
5133 static bool irq_test(SLMP_INFO *info)
5134 {
5135         unsigned long timeout;
5136         unsigned long flags;
5137
5138         unsigned char timer = (info->port_num & 1) ? TIMER2 : TIMER0;
5139
5140         spin_lock_irqsave(&info->lock,flags);
5141         reset_port(info);
5142
5143         /* assume failure */
5144         info->init_error = DiagStatus_IrqFailure;
5145         info->irq_occurred = false;
5146
5147         /* setup timer0 on SCA0 to interrupt */
5148
5149         /* IER2<7..4> = timer<3..0> interrupt enables (1=enabled) */
5150         write_reg(info, IER2, (unsigned char)((info->port_num & 1) ? BIT6 : BIT4));
5151
5152         write_reg(info, (unsigned char)(timer + TEPR), 0);      /* timer expand prescale */
5153         write_reg16(info, (unsigned char)(timer + TCONR), 1);   /* timer constant */
5154
5155
5156         /* TMCS, Timer Control/Status Register
5157          *
5158          * 07      CMF, Compare match flag (read only) 1=match
5159          * 06      ECMI, CMF Interrupt Enable: 1=enabled
5160          * 05      Reserved, must be 0
5161          * 04      TME, Timer Enable
5162          * 03..00  Reserved, must be 0
5163          *
5164          * 0101 0000
5165          */
5166         write_reg(info, (unsigned char)(timer + TMCS), 0x50);
5167
5168         spin_unlock_irqrestore(&info->lock,flags);
5169
5170         timeout=100;
5171         while( timeout-- && !info->irq_occurred ) {
5172                 msleep_interruptible(10);
5173         }
5174
5175         spin_lock_irqsave(&info->lock,flags);
5176         reset_port(info);
5177         spin_unlock_irqrestore(&info->lock,flags);
5178
5179         return info->irq_occurred;
5180 }
5181
5182 /* initialize individual SCA device (2 ports)
5183  */
5184 static bool sca_init(SLMP_INFO *info)
5185 {
5186         /* set wait controller to single mem partition (low), no wait states */
5187         write_reg(info, PABR0, 0);      /* wait controller addr boundary 0 */
5188         write_reg(info, PABR1, 0);      /* wait controller addr boundary 1 */
5189         write_reg(info, WCRL, 0);       /* wait controller low range */
5190         write_reg(info, WCRM, 0);       /* wait controller mid range */
5191         write_reg(info, WCRH, 0);       /* wait controller high range */
5192
5193         /* DPCR, DMA Priority Control
5194          *
5195          * 07..05  Not used, must be 0
5196          * 04      BRC, bus release condition: 0=all transfers complete
5197          * 03      CCC, channel change condition: 0=every cycle
5198          * 02..00  PR<2..0>, priority 100=round robin
5199          *
5200          * 00000100 = 0x04
5201          */
5202         write_reg(info, DPCR, dma_priority);
5203
5204         /* DMA Master Enable, BIT7: 1=enable all channels */
5205         write_reg(info, DMER, 0x80);
5206
5207         /* enable all interrupt classes */
5208         write_reg(info, IER0, 0xff);    /* TxRDY,RxRDY,TxINT,RxINT (ports 0-1) */
5209         write_reg(info, IER1, 0xff);    /* DMIB,DMIA (channels 0-3) */
5210         write_reg(info, IER2, 0xf0);    /* TIRQ (timers 0-3) */
5211
5212         /* ITCR, interrupt control register
5213          * 07      IPC, interrupt priority, 0=MSCI->DMA
5214          * 06..05  IAK<1..0>, Acknowledge cycle, 00=non-ack cycle
5215          * 04      VOS, Vector Output, 0=unmodified vector
5216          * 03..00  Reserved, must be 0
5217          */
5218         write_reg(info, ITCR, 0);
5219
5220         return true;
5221 }
5222
5223 /* initialize adapter hardware
5224  */
5225 static bool init_adapter(SLMP_INFO *info)
5226 {
5227         int i;
5228
5229         /* Set BIT30 of Local Control Reg 0x50 to reset SCA */
5230         volatile u32 *MiscCtrl = (u32 *)(info->lcr_base + 0x50);
5231         u32 readval;
5232
5233         info->misc_ctrl_value |= BIT30;
5234         *MiscCtrl = info->misc_ctrl_value;
5235
5236         /*
5237          * Force at least 170ns delay before clearing
5238          * reset bit. Each read from LCR takes at least
5239          * 30ns so 10 times for 300ns to be safe.
5240          */
5241         for(i=0;i<10;i++)
5242                 readval = *MiscCtrl;
5243
5244         info->misc_ctrl_value &= ~BIT30;
5245         *MiscCtrl = info->misc_ctrl_value;
5246
5247         /* init control reg (all DTRs off, all clksel=input) */
5248         info->ctrlreg_value = 0xaa;
5249         write_control_reg(info);
5250
5251         {
5252                 volatile u32 *LCR1BRDR = (u32 *)(info->lcr_base + 0x2c);
5253                 lcr1_brdr_value &= ~(BIT5 + BIT4 + BIT3);
5254
5255                 switch(read_ahead_count)
5256                 {
5257                 case 16:
5258                         lcr1_brdr_value |= BIT5 + BIT4 + BIT3;
5259                         break;
5260                 case 8:
5261                         lcr1_brdr_value |= BIT5 + BIT4;
5262                         break;
5263                 case 4:
5264                         lcr1_brdr_value |= BIT5 + BIT3;
5265                         break;
5266                 case 0:
5267                         lcr1_brdr_value |= BIT5;
5268                         break;
5269                 }
5270
5271                 *LCR1BRDR = lcr1_brdr_value;
5272                 *MiscCtrl = misc_ctrl_value;
5273         }
5274
5275         sca_init(info->port_array[0]);
5276         sca_init(info->port_array[2]);
5277
5278         return true;
5279 }
5280
5281 /* Loopback an HDLC frame to test the hardware
5282  * interrupt and DMA functions.
5283  */
5284 static bool loopback_test(SLMP_INFO *info)
5285 {
5286 #define TESTFRAMESIZE 20
5287
5288         unsigned long timeout;
5289         u16 count = TESTFRAMESIZE;
5290         unsigned char buf[TESTFRAMESIZE];
5291         bool rc = false;
5292         unsigned long flags;
5293
5294         struct tty_struct *oldtty = info->tty;
5295         u32 speed = info->params.clock_speed;
5296
5297         info->params.clock_speed = 3686400;
5298         info->tty = NULL;
5299
5300         /* assume failure */
5301         info->init_error = DiagStatus_DmaFailure;
5302
5303         /* build and send transmit frame */
5304         for (count = 0; count < TESTFRAMESIZE;++count)
5305                 buf[count] = (unsigned char)count;
5306
5307         memset(info->tmp_rx_buf,0,TESTFRAMESIZE);
5308
5309         /* program hardware for HDLC and enabled receiver */
5310         spin_lock_irqsave(&info->lock,flags);
5311         hdlc_mode(info);
5312         enable_loopback(info,1);
5313         rx_start(info);
5314         info->tx_count = count;
5315         tx_load_dma_buffer(info,buf,count);
5316         tx_start(info);
5317         spin_unlock_irqrestore(&info->lock,flags);
5318
5319         /* wait for receive complete */
5320         /* Set a timeout for waiting for interrupt. */
5321         for ( timeout = 100; timeout; --timeout ) {
5322                 msleep_interruptible(10);
5323
5324                 if (rx_get_frame(info)) {
5325                         rc = true;
5326                         break;
5327                 }
5328         }
5329
5330         /* verify received frame length and contents */
5331         if (rc &&
5332             ( info->tmp_rx_buf_count != count ||
5333               memcmp(buf, info->tmp_rx_buf,count))) {
5334                 rc = false;
5335         }
5336
5337         spin_lock_irqsave(&info->lock,flags);
5338         reset_adapter(info);
5339         spin_unlock_irqrestore(&info->lock,flags);
5340
5341         info->params.clock_speed = speed;
5342         info->tty = oldtty;
5343
5344         return rc;
5345 }
5346
5347 /* Perform diagnostics on hardware
5348  */
5349 static int adapter_test( SLMP_INFO *info )
5350 {
5351         unsigned long flags;
5352         if ( debug_level >= DEBUG_LEVEL_INFO )
5353                 printk( "%s(%d):Testing device %s\n",
5354                         __FILE__,__LINE__,info->device_name );
5355
5356         spin_lock_irqsave(&info->lock,flags);
5357         init_adapter(info);
5358         spin_unlock_irqrestore(&info->lock,flags);
5359
5360         info->port_array[0]->port_count = 0;
5361
5362         if ( register_test(info->port_array[0]) &&
5363                 register_test(info->port_array[1])) {
5364
5365                 info->port_array[0]->port_count = 2;
5366
5367                 if ( register_test(info->port_array[2]) &&
5368                         register_test(info->port_array[3]) )
5369                         info->port_array[0]->port_count += 2;
5370         }
5371         else {
5372                 printk( "%s(%d):Register test failure for device %s Addr=%08lX\n",
5373                         __FILE__,__LINE__,info->device_name, (unsigned long)(info->phys_sca_base));
5374                 return -ENODEV;
5375         }
5376
5377         if ( !irq_test(info->port_array[0]) ||
5378                 !irq_test(info->port_array[1]) ||
5379                  (info->port_count == 4 && !irq_test(info->port_array[2])) ||
5380                  (info->port_count == 4 && !irq_test(info->port_array[3]))) {
5381                 printk( "%s(%d):Interrupt test failure for device %s IRQ=%d\n",
5382                         __FILE__,__LINE__,info->device_name, (unsigned short)(info->irq_level) );
5383                 return -ENODEV;
5384         }
5385
5386         if (!loopback_test(info->port_array[0]) ||
5387                 !loopback_test(info->port_array[1]) ||
5388                  (info->port_count == 4 && !loopback_test(info->port_array[2])) ||
5389                  (info->port_count == 4 && !loopback_test(info->port_array[3]))) {
5390                 printk( "%s(%d):DMA test failure for device %s\n",
5391                         __FILE__,__LINE__,info->device_name);
5392                 return -ENODEV;
5393         }
5394
5395         if ( debug_level >= DEBUG_LEVEL_INFO )
5396                 printk( "%s(%d):device %s passed diagnostics\n",
5397                         __FILE__,__LINE__,info->device_name );
5398
5399         info->port_array[0]->init_error = 0;
5400         info->port_array[1]->init_error = 0;
5401         if ( info->port_count > 2 ) {
5402                 info->port_array[2]->init_error = 0;
5403                 info->port_array[3]->init_error = 0;
5404         }
5405
5406         return 0;
5407 }
5408
5409 /* Test the shared memory on a PCI adapter.
5410  */
5411 static bool memory_test(SLMP_INFO *info)
5412 {
5413         static unsigned long testval[] = { 0x0, 0x55555555, 0xaaaaaaaa,
5414                 0x66666666, 0x99999999, 0xffffffff, 0x12345678 };
5415         unsigned long count = ARRAY_SIZE(testval);
5416         unsigned long i;
5417         unsigned long limit = SCA_MEM_SIZE/sizeof(unsigned long);
5418         unsigned long * addr = (unsigned long *)info->memory_base;
5419
5420         /* Test data lines with test pattern at one location. */
5421
5422         for ( i = 0 ; i < count ; i++ ) {
5423                 *addr = testval[i];
5424                 if ( *addr != testval[i] )
5425                         return false;
5426         }
5427
5428         /* Test address lines with incrementing pattern over */
5429         /* entire address range. */
5430
5431         for ( i = 0 ; i < limit ; i++ ) {
5432                 *addr = i * 4;
5433                 addr++;
5434         }
5435
5436         addr = (unsigned long *)info->memory_base;
5437
5438         for ( i = 0 ; i < limit ; i++ ) {
5439                 if ( *addr != i * 4 )
5440                         return false;
5441                 addr++;
5442         }
5443
5444         memset( info->memory_base, 0, SCA_MEM_SIZE );
5445         return true;
5446 }
5447
5448 /* Load data into PCI adapter shared memory.
5449  *
5450  * The PCI9050 releases control of the local bus
5451  * after completing the current read or write operation.
5452  *
5453  * While the PCI9050 write FIFO not empty, the
5454  * PCI9050 treats all of the writes as a single transaction
5455  * and does not release the bus. This causes DMA latency problems
5456  * at high speeds when copying large data blocks to the shared memory.
5457  *
5458  * This function breaks a write into multiple transations by
5459  * interleaving a read which flushes the write FIFO and 'completes'
5460  * the write transation. This allows any pending DMA request to gain control
5461  * of the local bus in a timely fasion.
5462  */
5463 static void load_pci_memory(SLMP_INFO *info, char* dest, const char* src, unsigned short count)
5464 {
5465         /* A load interval of 16 allows for 4 32-bit writes at */
5466         /* 136ns each for a maximum latency of 542ns on the local bus.*/
5467
5468         unsigned short interval = count / sca_pci_load_interval;
5469         unsigned short i;
5470
5471         for ( i = 0 ; i < interval ; i++ )
5472         {
5473                 memcpy(dest, src, sca_pci_load_interval);
5474                 read_status_reg(info);
5475                 dest += sca_pci_load_interval;
5476                 src += sca_pci_load_interval;
5477         }
5478
5479         memcpy(dest, src, count % sca_pci_load_interval);
5480 }
5481
5482 static void trace_block(SLMP_INFO *info,const char* data, int count, int xmit)
5483 {
5484         int i;
5485         int linecount;
5486         if (xmit)
5487                 printk("%s tx data:\n",info->device_name);
5488         else
5489                 printk("%s rx data:\n",info->device_name);
5490
5491         while(count) {
5492                 if (count > 16)
5493                         linecount = 16;
5494                 else
5495                         linecount = count;
5496
5497                 for(i=0;i<linecount;i++)
5498                         printk("%02X ",(unsigned char)data[i]);
5499                 for(;i<17;i++)
5500                         printk("   ");
5501                 for(i=0;i<linecount;i++) {
5502                         if (data[i]>=040 && data[i]<=0176)
5503                                 printk("%c",data[i]);
5504                         else
5505                                 printk(".");
5506                 }
5507                 printk("\n");
5508
5509                 data  += linecount;
5510                 count -= linecount;
5511         }
5512 }       /* end of trace_block() */
5513
5514 /* called when HDLC frame times out
5515  * update stats and do tx completion processing
5516  */
5517 static void tx_timeout(unsigned long context)
5518 {
5519         SLMP_INFO *info = (SLMP_INFO*)context;
5520         unsigned long flags;
5521
5522         if ( debug_level >= DEBUG_LEVEL_INFO )
5523                 printk( "%s(%d):%s tx_timeout()\n",
5524                         __FILE__,__LINE__,info->device_name);
5525         if(info->tx_active && info->params.mode == MGSL_MODE_HDLC) {
5526                 info->icount.txtimeout++;
5527         }
5528         spin_lock_irqsave(&info->lock,flags);
5529         info->tx_active = false;
5530         info->tx_count = info->tx_put = info->tx_get = 0;
5531
5532         spin_unlock_irqrestore(&info->lock,flags);
5533
5534 #if SYNCLINK_GENERIC_HDLC
5535         if (info->netcount)
5536                 hdlcdev_tx_done(info);
5537         else
5538 #endif
5539                 bh_transmit(info);
5540 }
5541
5542 /* called to periodically check the DSR/RI modem signal input status
5543  */
5544 static void status_timeout(unsigned long context)
5545 {
5546         u16 status = 0;
5547         SLMP_INFO *info = (SLMP_INFO*)context;
5548         unsigned long flags;
5549         unsigned char delta;
5550
5551
5552         spin_lock_irqsave(&info->lock,flags);
5553         get_signals(info);
5554         spin_unlock_irqrestore(&info->lock,flags);
5555
5556         /* check for DSR/RI state change */
5557
5558         delta = info->old_signals ^ info->serial_signals;
5559         info->old_signals = info->serial_signals;
5560
5561         if (delta & SerialSignal_DSR)
5562                 status |= MISCSTATUS_DSR_LATCHED|(info->serial_signals&SerialSignal_DSR);
5563
5564         if (delta & SerialSignal_RI)
5565                 status |= MISCSTATUS_RI_LATCHED|(info->serial_signals&SerialSignal_RI);
5566
5567         if (delta & SerialSignal_DCD)
5568                 status |= MISCSTATUS_DCD_LATCHED|(info->serial_signals&SerialSignal_DCD);
5569
5570         if (delta & SerialSignal_CTS)
5571                 status |= MISCSTATUS_CTS_LATCHED|(info->serial_signals&SerialSignal_CTS);
5572
5573         if (status)
5574                 isr_io_pin(info,status);
5575
5576         mod_timer(&info->status_timer, jiffies + msecs_to_jiffies(10));
5577 }
5578
5579
5580 /* Register Access Routines -
5581  * All registers are memory mapped
5582  */
5583 #define CALC_REGADDR() \
5584         unsigned char * RegAddr = (unsigned char*)(info->sca_base + Addr); \
5585         if (info->port_num > 1) \
5586                 RegAddr += 256;                 /* port 0-1 SCA0, 2-3 SCA1 */ \
5587         if ( info->port_num & 1) { \
5588                 if (Addr > 0x7f) \
5589                         RegAddr += 0x40;        /* DMA access */ \
5590                 else if (Addr > 0x1f && Addr < 0x60) \
5591                         RegAddr += 0x20;        /* MSCI access */ \
5592         }
5593
5594
5595 static unsigned char read_reg(SLMP_INFO * info, unsigned char Addr)
5596 {
5597         CALC_REGADDR();
5598         return *RegAddr;
5599 }
5600 static void write_reg(SLMP_INFO * info, unsigned char Addr, unsigned char Value)
5601 {
5602         CALC_REGADDR();
5603         *RegAddr = Value;
5604 }
5605
5606 static u16 read_reg16(SLMP_INFO * info, unsigned char Addr)
5607 {
5608         CALC_REGADDR();
5609         return *((u16 *)RegAddr);
5610 }
5611
5612 static void write_reg16(SLMP_INFO * info, unsigned char Addr, u16 Value)
5613 {
5614         CALC_REGADDR();
5615         *((u16 *)RegAddr) = Value;
5616 }
5617
5618 static unsigned char read_status_reg(SLMP_INFO * info)
5619 {
5620         unsigned char *RegAddr = (unsigned char *)info->statctrl_base;
5621         return *RegAddr;
5622 }
5623
5624 static void write_control_reg(SLMP_INFO * info)
5625 {
5626         unsigned char *RegAddr = (unsigned char *)info->statctrl_base;
5627         *RegAddr = info->port_array[0]->ctrlreg_value;
5628 }
5629
5630
5631 static int __devinit synclinkmp_init_one (struct pci_dev *dev,
5632                                           const struct pci_device_id *ent)
5633 {
5634         if (pci_enable_device(dev)) {
5635                 printk("error enabling pci device %p\n", dev);
5636                 return -EIO;
5637         }
5638         device_init( ++synclinkmp_adapter_count, dev );
5639         return 0;
5640 }
5641
5642 static void __devexit synclinkmp_remove_one (struct pci_dev *dev)
5643 {
5644 }