drivers/char/synclink_gt.c

   1 /*
   2  * Device driver for Microgate SyncLink GT serial adapters.
   3  *
   4  * written by Paul Fulghum for Microgate Corporation
   5  * paulkf@microgate.com
   6  *
   7  * Microgate and SyncLink are trademarks of Microgate Corporation
   8  *
   9  * This code is released under the GNU General Public License (GPL)
  10  *
  11  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  12  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  13  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  14  * DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
  15  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  16  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  17  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  18  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  19  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  20  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  21  * OF THE POSSIBILITY OF SUCH DAMAGE.
  22  */
  23
  24 /*
  25  * DEBUG OUTPUT DEFINITIONS
  26  *
  27  * uncomment lines below to enable specific types of debug output
  28  *
  29  * DBGINFO   information - most verbose output
  30  * DBGERR    serious errors
  31  * DBGBH     bottom half service routine debugging
  32  * DBGISR    interrupt service routine debugging
  33  * DBGDATA   output receive and transmit data
  34  * DBGTBUF   output transmit DMA buffers and registers
  35  * DBGRBUF   output receive DMA buffers and registers
  36  */
  37
  38 #define DBGINFO(fmt) if (debug_level >= DEBUG_LEVEL_INFO) printk fmt
  39 #define DBGERR(fmt) if (debug_level >= DEBUG_LEVEL_ERROR) printk fmt
  40 #define DBGBH(fmt) if (debug_level >= DEBUG_LEVEL_BH) printk fmt
  41 #define DBGISR(fmt) if (debug_level >= DEBUG_LEVEL_ISR) printk fmt
  42 #define DBGDATA(info, buf, size, label) if (debug_level >= DEBUG_LEVEL_DATA) trace_block((info), (buf), (size), (label))
  43 //#define DBGTBUF(info) dump_tbufs(info)
  44 //#define DBGRBUF(info) dump_rbufs(info)
  45
  46
  47 #include <linux/module.h>
  48 #include <linux/errno.h>
  49 #include <linux/signal.h>
  50 #include <linux/sched.h>
  51 #include <linux/timer.h>
  52 #include <linux/interrupt.h>
  53 #include <linux/pci.h>
  54 #include <linux/tty.h>
  55 #include <linux/tty_flip.h>
  56 #include <linux/serial.h>
  57 #include <linux/major.h>
  58 #include <linux/string.h>
  59 #include <linux/fcntl.h>
  60 #include <linux/ptrace.h>
  61 #include <linux/ioport.h>
  62 #include <linux/mm.h>
  63 #include <linux/slab.h>
  64 #include <linux/netdevice.h>
  65 #include <linux/vmalloc.h>
  66 #include <linux/init.h>
  67 #include <linux/delay.h>
  68 #include <linux/ioctl.h>
  69 #include <linux/termios.h>
  70 #include <linux/bitops.h>
  71 #include <linux/workqueue.h>
  72 #include <linux/hdlc.h>
  73 #include <linux/synclink.h>
  74
  75 #include <asm/system.h>
  76 #include <asm/io.h>
  77 #include <asm/irq.h>
  78 #include <asm/dma.h>
  79 #include <asm/types.h>
  80 #include <asm/uaccess.h>
  81
  82 #if defined(CONFIG_HDLC) || (defined(CONFIG_HDLC_MODULE) && defined(CONFIG_SYNCLINK_GT_MODULE))
  83 #define SYNCLINK_GENERIC_HDLC 1
  84 #else
  85 #define SYNCLINK_GENERIC_HDLC 0
  86 #endif
  87
  88 /*
  89  * module identification
  90  */
  91 static char *driver_name     = "SyncLink GT";
  92 static char *tty_driver_name = "synclink_gt";
  93 static char *tty_dev_prefix  = "ttySLG";
  94 MODULE_LICENSE("GPL");
  95 #define MGSL_MAGIC 0x5401
  96 #define MAX_DEVICES 32
  97
  98 static struct pci_device_id pci_table[] = {
  99         {PCI_VENDOR_ID_MICROGATE, SYNCLINK_GT_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,},
 100         {PCI_VENDOR_ID_MICROGATE, SYNCLINK_GT2_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,},
 101         {PCI_VENDOR_ID_MICROGATE, SYNCLINK_GT4_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,},
 102         {PCI_VENDOR_ID_MICROGATE, SYNCLINK_AC_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,},
 103         {0,}, /* terminate list */
 104 };
 105 MODULE_DEVICE_TABLE(pci, pci_table);
 106
 107 static int  init_one(struct pci_dev *dev,const struct pci_device_id *ent);
 108 static void remove_one(struct pci_dev *dev);
 109 static struct pci_driver pci_driver = {
 110         .name           = "synclink_gt",
 111         .id_table       = pci_table,
 112         .probe          = init_one,
 113         .remove         = __devexit_p(remove_one),
 114 };
 115
 116 static bool pci_registered;
 117
 118 /*
 119  * module configuration and status
 120  */
 121 static struct slgt_info *slgt_device_list;
 122 static int slgt_device_count;
 123
 124 static int ttymajor;
 125 static int debug_level;
 126 static int maxframe[MAX_DEVICES];
 127
 128 module_param(ttymajor, int, 0);
 129 module_param(debug_level, int, 0);
 130 module_param_array(maxframe, int, NULL, 0);
 131
 132 MODULE_PARM_DESC(ttymajor, "TTY major device number override: 0=auto assigned");
 133 MODULE_PARM_DESC(debug_level, "Debug syslog output: 0=disabled, 1 to 5=increasing detail");
 134 MODULE_PARM_DESC(maxframe, "Maximum frame size used by device (4096 to 65535)");
 135
 136 /*
 137  * tty support and callbacks
 138  */
 139 static struct tty_driver *serial_driver;
 140
 141 static int  open(struct tty_struct *tty, struct file * filp);
 142 static void close(struct tty_struct *tty, struct file * filp);
 143 static void hangup(struct tty_struct *tty);
 144 static void set_termios(struct tty_struct *tty, struct ktermios *old_termios);
 145
 146 static int  write(struct tty_struct *tty, const unsigned char *buf, int count);
 147 static int put_char(struct tty_struct *tty, unsigned char ch);
 148 static void send_xchar(struct tty_struct *tty, char ch);
 149 static void wait_until_sent(struct tty_struct *tty, int timeout);
 150 static int  write_room(struct tty_struct *tty);
 151 static void flush_chars(struct tty_struct *tty);
 152 static void flush_buffer(struct tty_struct *tty);
 153 static void tx_hold(struct tty_struct *tty);
 154 static void tx_release(struct tty_struct *tty);
 155
 156 static int  ioctl(struct tty_struct *tty, struct file *file, unsigned int cmd, unsigned long arg);
 157 static int  read_proc(char *page, char **start, off_t off, int count,int *eof, void *data);
 158 static int  chars_in_buffer(struct tty_struct *tty);
 159 static void throttle(struct tty_struct * tty);
 160 static void unthrottle(struct tty_struct * tty);
 161 static int set_break(struct tty_struct *tty, int break_state);
 162
 163 /*
 164  * generic HDLC support and callbacks
 165  */
 166 #if SYNCLINK_GENERIC_HDLC
 167 #define dev_to_port(D) (dev_to_hdlc(D)->priv)
 168 static void hdlcdev_tx_done(struct slgt_info *info);
 169 static void hdlcdev_rx(struct slgt_info *info, char *buf, int size);
 170 static int  hdlcdev_init(struct slgt_info *info);
 171 static void hdlcdev_exit(struct slgt_info *info);
 172 #endif
 173
 174
 175 /*
 176  * device specific structures, macros and functions
 177  */
 178
 179 #define SLGT_MAX_PORTS 4
 180 #define SLGT_REG_SIZE  256
 181
 182 /*
 183  * conditional wait facility
 184  */
 185 struct cond_wait {
 186         struct cond_wait *next;
 187         wait_queue_head_t q;
 188         wait_queue_t wait;
 189         unsigned int data;
 190 };
 191 static void init_cond_wait(struct cond_wait *w, unsigned int data);
 192 static void add_cond_wait(struct cond_wait **head, struct cond_wait *w);
 193 static void remove_cond_wait(struct cond_wait **head, struct cond_wait *w);
 194 static void flush_cond_wait(struct cond_wait **head);
 195
 196 /*
 197  * DMA buffer descriptor and access macros
 198  */
 199 struct slgt_desc
 200 {
 201         __le16 count;
 202         __le16 status;
 203         __le32 pbuf;  /* physical address of data buffer */
 204         __le32 next;  /* physical address of next descriptor */
 205
 206         /* driver book keeping */
 207         char *buf;          /* virtual  address of data buffer */
 208         unsigned int pdesc; /* physical address of this descriptor */
 209         dma_addr_t buf_dma_addr;
 210         unsigned short buf_count;
 211 };
 212
 213 #define set_desc_buffer(a,b) (a).pbuf = cpu_to_le32((unsigned int)(b))
 214 #define set_desc_next(a,b) (a).next   = cpu_to_le32((unsigned int)(b))
 215 #define set_desc_count(a,b)(a).count  = cpu_to_le16((unsigned short)(b))
 216 #define set_desc_eof(a,b)  (a).status = cpu_to_le16((b) ? (le16_to_cpu((a).status) | BIT0) : (le16_to_cpu((a).status) & ~BIT0))
 217 #define desc_count(a)      (le16_to_cpu((a).count))
 218 #define desc_status(a)     (le16_to_cpu((a).status))
 219 #define desc_complete(a)   (le16_to_cpu((a).status) & BIT15)
 220 #define desc_eof(a)        (le16_to_cpu((a).status) & BIT2)
 221 #define desc_crc_error(a)  (le16_to_cpu((a).status) & BIT1)
 222 #define desc_abort(a)      (le16_to_cpu((a).status) & BIT0)
 223 #define desc_residue(a)    ((le16_to_cpu((a).status) & 0x38) >> 3)
 224
 225 struct _input_signal_events {
 226         int ri_up;
 227         int ri_down;
 228         int dsr_up;
 229         int dsr_down;
 230         int dcd_up;
 231         int dcd_down;
 232         int cts_up;
 233         int cts_down;
 234 };
 235
 236 /*
 237  * device instance data structure
 238  */
 239 struct slgt_info {
 240         void *if_ptr;           /* General purpose pointer (used by SPPP) */
 241         struct tty_port port;
 242
 243         struct slgt_info *next_device;  /* device list link */
 244
 245         int magic;
 246
 247         char device_name[25];
 248         struct pci_dev *pdev;
 249
 250         int port_count;  /* count of ports on adapter */
 251         int adapter_num; /* adapter instance number */
 252         int port_num;    /* port instance number */
 253
 254         /* array of pointers to port contexts on this adapter */
 255         struct slgt_info *port_array[SLGT_MAX_PORTS];
 256
 257         int                     line;           /* tty line instance number */
 258
 259         struct mgsl_icount      icount;
 260
 261         int                     timeout;
 262         int                     x_char;         /* xon/xoff character */
 263         unsigned int            read_status_mask;
 264         unsigned int            ignore_status_mask;
 265
 266         wait_queue_head_t       status_event_wait_q;
 267         wait_queue_head_t       event_wait_q;
 268         struct timer_list       tx_timer;
 269         struct timer_list       rx_timer;
 270
 271         unsigned int            gpio_present;
 272         struct cond_wait        *gpio_wait_q;
 273
 274         spinlock_t lock;        /* spinlock for synchronizing with ISR */
 275
 276         struct work_struct task;
 277         u32 pending_bh;
 278         bool bh_requested;
 279         bool bh_running;
 280
 281         int isr_overflow;
 282         bool irq_requested;     /* true if IRQ requested */
 283         bool irq_occurred;      /* for diagnostics use */
 284
 285         /* device configuration */
 286
 287         unsigned int bus_type;
 288         unsigned int irq_level;
 289         unsigned long irq_flags;
 290
 291         unsigned char __iomem * reg_addr;  /* memory mapped registers address */
 292         u32 phys_reg_addr;
 293         bool reg_addr_requested;
 294
 295         MGSL_PARAMS params;       /* communications parameters */
 296         u32 idle_mode;
 297         u32 max_frame_size;       /* as set by device config */
 298
 299         unsigned int rbuf_fill_level;
 300         unsigned int if_mode;
 301
 302         /* device status */
 303
 304         bool rx_enabled;
 305         bool rx_restart;
 306
 307         bool tx_enabled;
 308         bool tx_active;
 309
 310         unsigned char signals;    /* serial signal states */
 311         int init_error;  /* initialization error */
 312
 313         unsigned char *tx_buf;
 314         int tx_count;
 315
 316         char flag_buf[MAX_ASYNC_BUFFER_SIZE];
 317         char char_buf[MAX_ASYNC_BUFFER_SIZE];
 318         bool drop_rts_on_tx_done;
 319         struct  _input_signal_events    input_signal_events;
 320
 321         int dcd_chkcount;       /* check counts to prevent */
 322         int cts_chkcount;       /* too many IRQs if a signal */
 323         int dsr_chkcount;       /* is floating */
 324         int ri_chkcount;
 325
 326         char *bufs;             /* virtual address of DMA buffer lists */
 327         dma_addr_t bufs_dma_addr; /* physical address of buffer descriptors */
 328
 329         unsigned int rbuf_count;
 330         struct slgt_desc *rbufs;
 331         unsigned int rbuf_current;
 332         unsigned int rbuf_index;
 333
 334         unsigned int tbuf_count;
 335         struct slgt_desc *tbufs;
 336         unsigned int tbuf_current;
 337         unsigned int tbuf_start;
 338
 339         unsigned char *tmp_rbuf;
 340         unsigned int tmp_rbuf_count;
 341
 342         /* SPPP/Cisco HDLC device parts */
 343
 344         int netcount;
 345         spinlock_t netlock;
 346 #if SYNCLINK_GENERIC_HDLC
 347         struct net_device *netdev;
 348 #endif
 349
 350 };
 351
 352 static MGSL_PARAMS default_params = {
 353         .mode            = MGSL_MODE_HDLC,
 354         .loopback        = 0,
 355         .flags           = HDLC_FLAG_UNDERRUN_ABORT15,
 356         .encoding        = HDLC_ENCODING_NRZI_SPACE,
 357         .clock_speed     = 0,
 358         .addr_filter     = 0xff,
 359         .crc_type        = HDLC_CRC_16_CCITT,
 360         .preamble_length = HDLC_PREAMBLE_LENGTH_8BITS,
 361         .preamble        = HDLC_PREAMBLE_PATTERN_NONE,
 362         .data_rate       = 9600,
 363         .data_bits       = 8,
 364         .stop_bits       = 1,
 365         .parity          = ASYNC_PARITY_NONE
 366 };
 367
 368
 369 #define BH_RECEIVE  1
 370 #define BH_TRANSMIT 2
 371 #define BH_STATUS   4
 372 #define IO_PIN_SHUTDOWN_LIMIT 100
 373
 374 #define DMABUFSIZE 256
 375 #define DESC_LIST_SIZE 4096
 376
 377 #define MASK_PARITY  BIT1
 378 #define MASK_FRAMING BIT0
 379 #define MASK_BREAK   BIT14
 380 #define MASK_OVERRUN BIT4
 381
 382 #define GSR   0x00 /* global status */
 383 #define JCR   0x04 /* JTAG control */
 384 #define IODR  0x08 /* GPIO direction */
 385 #define IOER  0x0c /* GPIO interrupt enable */
 386 #define IOVR  0x10 /* GPIO value */
 387 #define IOSR  0x14 /* GPIO interrupt status */
 388 #define TDR   0x80 /* tx data */
 389 #define RDR   0x80 /* rx data */
 390 #define TCR   0x82 /* tx control */
 391 #define TIR   0x84 /* tx idle */
 392 #define TPR   0x85 /* tx preamble */
 393 #define RCR   0x86 /* rx control */
 394 #define VCR   0x88 /* V.24 control */
 395 #define CCR   0x89 /* clock control */
 396 #define BDR   0x8a /* baud divisor */
 397 #define SCR   0x8c /* serial control */
 398 #define SSR   0x8e /* serial status */
 399 #define RDCSR 0x90 /* rx DMA control/status */
 400 #define TDCSR 0x94 /* tx DMA control/status */
 401 #define RDDAR 0x98 /* rx DMA descriptor address */
 402 #define TDDAR 0x9c /* tx DMA descriptor address */
 403
 404 #define RXIDLE      BIT14
 405 #define RXBREAK     BIT14
 406 #define IRQ_TXDATA  BIT13
 407 #define IRQ_TXIDLE  BIT12
 408 #define IRQ_TXUNDER BIT11 /* HDLC */
 409 #define IRQ_RXDATA  BIT10
 410 #define IRQ_RXIDLE  BIT9  /* HDLC */
 411 #define IRQ_RXBREAK BIT9  /* async */
 412 #define IRQ_RXOVER  BIT8
 413 #define IRQ_DSR     BIT7
 414 #define IRQ_CTS     BIT6
 415 #define IRQ_DCD     BIT5
 416 #define IRQ_RI      BIT4
 417 #define IRQ_ALL     0x3ff0
 418 #define IRQ_MASTER  BIT0
 419
 420 #define slgt_irq_on(info, mask) \
 421         wr_reg16((info), SCR, (unsigned short)(rd_reg16((info), SCR) | (mask)))
 422 #define slgt_irq_off(info, mask) \
 423         wr_reg16((info), SCR, (unsigned short)(rd_reg16((info), SCR) & ~(mask)))
 424
 425 static __u8  rd_reg8(struct slgt_info *info, unsigned int addr);
 426 static void  wr_reg8(struct slgt_info *info, unsigned int addr, __u8 value);
 427 static __u16 rd_reg16(struct slgt_info *info, unsigned int addr);
 428 static void  wr_reg16(struct slgt_info *info, unsigned int addr, __u16 value);
 429 static __u32 rd_reg32(struct slgt_info *info, unsigned int addr);
 430 static void  wr_reg32(struct slgt_info *info, unsigned int addr, __u32 value);
 431
 432 static void  msc_set_vcr(struct slgt_info *info);
 433
 434 static int  startup(struct slgt_info *info);
 435 static int  block_til_ready(struct tty_struct *tty, struct file * filp,struct slgt_info *info);
 436 static void shutdown(struct slgt_info *info);
 437 static void program_hw(struct slgt_info *info);
 438 static void change_params(struct slgt_info *info);
 439
 440 static int  register_test(struct slgt_info *info);
 441 static int  irq_test(struct slgt_info *info);
 442 static int  loopback_test(struct slgt_info *info);
 443 static int  adapter_test(struct slgt_info *info);
 444
 445 static void reset_adapter(struct slgt_info *info);
 446 static void reset_port(struct slgt_info *info);
 447 static void async_mode(struct slgt_info *info);
 448 static void sync_mode(struct slgt_info *info);
 449
 450 static void rx_stop(struct slgt_info *info);
 451 static void rx_start(struct slgt_info *info);
 452 static void reset_rbufs(struct slgt_info *info);
 453 static void free_rbufs(struct slgt_info *info, unsigned int first, unsigned int last);
 454 static void rdma_reset(struct slgt_info *info);
 455 static bool rx_get_frame(struct slgt_info *info);
 456 static bool rx_get_buf(struct slgt_info *info);
 457
 458 static void tx_start(struct slgt_info *info);
 459 static void tx_stop(struct slgt_info *info);
 460 static void tx_set_idle(struct slgt_info *info);
 461 static unsigned int free_tbuf_count(struct slgt_info *info);
 462 static unsigned int tbuf_bytes(struct slgt_info *info);
 463 static void reset_tbufs(struct slgt_info *info);
 464 static void tdma_reset(struct slgt_info *info);
 465 static void tdma_start(struct slgt_info *info);
 466 static void tx_load(struct slgt_info *info, const char *buf, unsigned int count);
 467
 468 static void get_signals(struct slgt_info *info);
 469 static void set_signals(struct slgt_info *info);
 470 static void enable_loopback(struct slgt_info *info);
 471 static void set_rate(struct slgt_info *info, u32 data_rate);
 472
 473 static int  bh_action(struct slgt_info *info);
 474 static void bh_handler(struct work_struct *work);
 475 static void bh_transmit(struct slgt_info *info);
 476 static void isr_serial(struct slgt_info *info);
 477 static void isr_rdma(struct slgt_info *info);
 478 static void isr_txeom(struct slgt_info *info, unsigned short status);
 479 static void isr_tdma(struct slgt_info *info);
 480
 481 static int  alloc_dma_bufs(struct slgt_info *info);
 482 static void free_dma_bufs(struct slgt_info *info);
 483 static int  alloc_desc(struct slgt_info *info);
 484 static void free_desc(struct slgt_info *info);
 485 static int  alloc_bufs(struct slgt_info *info, struct slgt_desc *bufs, int count);
 486 static void free_bufs(struct slgt_info *info, struct slgt_desc *bufs, int count);
 487
 488 static int  alloc_tmp_rbuf(struct slgt_info *info);
 489 static void free_tmp_rbuf(struct slgt_info *info);
 490
 491 static void tx_timeout(unsigned long context);
 492 static void rx_timeout(unsigned long context);
 493
 494 /*
 495  * ioctl handlers
 496  */
 497 static int  get_stats(struct slgt_info *info, struct mgsl_icount __user *user_icount);
 498 static int  get_params(struct slgt_info *info, MGSL_PARAMS __user *params);
 499 static int  set_params(struct slgt_info *info, MGSL_PARAMS __user *params);
 500 static int  get_txidle(struct slgt_info *info, int __user *idle_mode);
 501 static int  set_txidle(struct slgt_info *info, int idle_mode);
 502 static int  tx_enable(struct slgt_info *info, int enable);
 503 static int  tx_abort(struct slgt_info *info);
 504 static int  rx_enable(struct slgt_info *info, int enable);
 505 static int  modem_input_wait(struct slgt_info *info,int arg);
 506 static int  wait_mgsl_event(struct slgt_info *info, int __user *mask_ptr);
 507 static int  tiocmget(struct tty_struct *tty, struct file *file);
 508 static int  tiocmset(struct tty_struct *tty, struct file *file,
 509                      unsigned int set, unsigned int clear);
 510 static int set_break(struct tty_struct *tty, int break_state);
 511 static int  get_interface(struct slgt_info *info, int __user *if_mode);
 512 static int  set_interface(struct slgt_info *info, int if_mode);
 513 static int  set_gpio(struct slgt_info *info, struct gpio_desc __user *gpio);
 514 static int  get_gpio(struct slgt_info *info, struct gpio_desc __user *gpio);
 515 static int  wait_gpio(struct slgt_info *info, struct gpio_desc __user *gpio);
 516
 517 /*
 518  * driver functions
 519  */
 520 static void add_device(struct slgt_info *info);
 521 static void device_init(int adapter_num, struct pci_dev *pdev);
 522 static int  claim_resources(struct slgt_info *info);
 523 static void release_resources(struct slgt_info *info);
 524
 525 /*
 526  * DEBUG OUTPUT CODE
 527  */
 528 #ifndef DBGINFO
 529 #define DBGINFO(fmt)
 530 #endif
 531 #ifndef DBGERR
 532 #define DBGERR(fmt)
 533 #endif
 534 #ifndef DBGBH
 535 #define DBGBH(fmt)
 536 #endif
 537 #ifndef DBGISR
 538 #define DBGISR(fmt)
 539 #endif
 540
 541 #ifdef DBGDATA
 542 static void trace_block(struct slgt_info *info, const char *data, int count, const char *label)
 543 {
 544         int i;
 545         int linecount;
 546         printk("%s %s data:\n",info->device_name, label);
 547         while(count) {
 548                 linecount = (count > 16) ? 16 : count;
 549                 for(i=0; i < linecount; i++)
 550                         printk("%02X ",(unsigned char)data[i]);
 551                 for(;i<17;i++)
 552                         printk("   ");
 553                 for(i=0;i<linecount;i++) {
 554                         if (data[i]>=040 && data[i]<=0176)
 555                                 printk("%c",data[i]);
 556                         else
 557                                 printk(".");
 558                 }
 559                 printk("\n");
 560                 data  += linecount;
 561                 count -= linecount;
 562         }
 563 }
 564 #else
 565 #define DBGDATA(info, buf, size, label)
 566 #endif
 567
 568 #ifdef DBGTBUF
 569 static void dump_tbufs(struct slgt_info *info)
 570 {
 571         int i;
 572         printk("tbuf_current=%d\n", info->tbuf_current);
 573         for (i=0 ; i < info->tbuf_count ; i++) {
 574                 printk("%d: count=%04X status=%04X\n",
 575                         i, le16_to_cpu(info->tbufs[i].count), le16_to_cpu(info->tbufs[i].status));
 576         }
 577 }
 578 #else
 579 #define DBGTBUF(info)
 580 #endif
 581
 582 #ifdef DBGRBUF
 583 static void dump_rbufs(struct slgt_info *info)
 584 {
 585         int i;
 586         printk("rbuf_current=%d\n", info->rbuf_current);
 587         for (i=0 ; i < info->rbuf_count ; i++) {
 588                 printk("%d: count=%04X status=%04X\n",
 589                         i, le16_to_cpu(info->rbufs[i].count), le16_to_cpu(info->rbufs[i].status));
 590         }
 591 }
 592 #else
 593 #define DBGRBUF(info)
 594 #endif
 595
 596 static inline int sanity_check(struct slgt_info *info, char *devname, const char *name)
 597 {
 598 #ifdef SANITY_CHECK
 599         if (!info) {
 600                 printk("null struct slgt_info for (%s) in %s\n", devname, name);
 601                 return 1;
 602         }
 603         if (info->magic != MGSL_MAGIC) {
 604                 printk("bad magic number struct slgt_info (%s) in %s\n", devname, name);
 605                 return 1;
 606         }
 607 #else
 608         if (!info)
 609                 return 1;
 610 #endif
 611         return 0;
 612 }
 613
 614 /**
 615  * line discipline callback wrappers
 616  *
 617  * The wrappers maintain line discipline references
 618  * while calling into the line discipline.
 619  *
 620  * ldisc_receive_buf  - pass receive data to line discipline
 621  */
 622 static void ldisc_receive_buf(struct tty_struct *tty,
 623                               const __u8 *data, char *flags, int count)
 624 {
 625         struct tty_ldisc *ld;
 626         if (!tty)
 627                 return;
 628         ld = tty_ldisc_ref(tty);
 629         if (ld) {
 630                 if (ld->ops->receive_buf)
 631                         ld->ops->receive_buf(tty, data, flags, count);
 632                 tty_ldisc_deref(ld);
 633         }
 634 }
 635
 636 /* tty callbacks */
 637
 638 static int open(struct tty_struct *tty, struct file *filp)
 639 {
 640         struct slgt_info *info;
 641         int retval, line;
 642         unsigned long flags;
 643
 644         line = tty->index;
 645         if ((line < 0) || (line >= slgt_device_count)) {
 646                 DBGERR(("%s: open with invalid line #%d.\n", driver_name, line));
 647                 return -ENODEV;
 648         }
 649
 650         info = slgt_device_list;
 651         while(info && info->line != line)
 652                 info = info->next_device;
 653         if (sanity_check(info, tty->name, "open"))
 654                 return -ENODEV;
 655         if (info->init_error) {
 656                 DBGERR(("%s init error=%d\n", info->device_name, info->init_error));
 657                 return -ENODEV;
 658         }
 659
 660         tty->driver_data = info;
 661         info->port.tty = tty;
 662
 663         DBGINFO(("%s open, old ref count = %d\n", info->device_name, info->port.count));
 664
 665         /* If port is closing, signal caller to try again */
 666         if (tty_hung_up_p(filp) || info->port.flags & ASYNC_CLOSING){
 667                 if (info->port.flags & ASYNC_CLOSING)
 668                         interruptible_sleep_on(&info->port.close_wait);
 669                 retval = ((info->port.flags & ASYNC_HUP_NOTIFY) ?
 670                         -EAGAIN : -ERESTARTSYS);
 671                 goto cleanup;
 672         }
 673
 674         info->port.tty->low_latency = (info->port.flags & ASYNC_LOW_LATENCY) ? 1 : 0;
 675
 676         spin_lock_irqsave(&info->netlock, flags);
 677         if (info->netcount) {
 678                 retval = -EBUSY;
 679                 spin_unlock_irqrestore(&info->netlock, flags);
 680                 goto cleanup;
 681         }
 682         info->port.count++;
 683         spin_unlock_irqrestore(&info->netlock, flags);
 684
 685         if (info->port.count == 1) {
 686                 /* 1st open on this device, init hardware */
 687                 retval = startup(info);
 688                 if (retval < 0)
 689                         goto cleanup;
 690         }
 691
 692         retval = block_til_ready(tty, filp, info);
 693         if (retval) {
 694                 DBGINFO(("%s block_til_ready rc=%d\n", info->device_name, retval));
 695                 goto cleanup;
 696         }
 697
 698         retval = 0;
 699
 700 cleanup:
 701         if (retval) {
 702                 if (tty->count == 1)
 703                         info->port.tty = NULL; /* tty layer will release tty struct */
 704                 if(info->port.count)
 705                         info->port.count--;
 706         }
 707
 708         DBGINFO(("%s open rc=%d\n", info->device_name, retval));
 709         return retval;
 710 }
 711
 712 static void close(struct tty_struct *tty, struct file *filp)
 713 {
 714         struct slgt_info *info = tty->driver_data;
 715
 716         if (sanity_check(info, tty->name, "close"))
 717                 return;
 718         DBGINFO(("%s close entry, count=%d\n", info->device_name, info->port.count));
 719
 720         if (tty_port_close_start(&info->port, tty, filp) == 0)
 721                 goto cleanup;
 722
 723         if (info->port.flags & ASYNC_INITIALIZED)
 724                 wait_until_sent(tty, info->timeout);
 725         flush_buffer(tty);
 726         tty_ldisc_flush(tty);
 727
 728         shutdown(info);
 729
 730         tty_port_close_end(&info->port, tty);
 731         info->port.tty = NULL;
 732 cleanup:
 733         DBGINFO(("%s close exit, count=%d\n", tty->driver->name, info->port.count));
 734 }
 735
 736 static void hangup(struct tty_struct *tty)
 737 {
 738         struct slgt_info *info = tty->driver_data;
 739
 740         if (sanity_check(info, tty->name, "hangup"))
 741                 return;
 742         DBGINFO(("%s hangup\n", info->device_name));
 743
 744         flush_buffer(tty);
 745         shutdown(info);
 746
 747         info->port.count = 0;
 748         info->port.flags &= ~ASYNC_NORMAL_ACTIVE;
 749         info->port.tty = NULL;
 750
 751         wake_up_interruptible(&info->port.open_wait);
 752 }
 753
 754 static void set_termios(struct tty_struct *tty, struct ktermios *old_termios)
 755 {
 756         struct slgt_info *info = tty->driver_data;
 757         unsigned long flags;
 758
 759         DBGINFO(("%s set_termios\n", tty->driver->name));
 760
 761         change_params(info);
 762
 763         /* Handle transition to B0 status */
 764         if (old_termios->c_cflag & CBAUD &&
 765             !(tty->termios->c_cflag & CBAUD)) {
 766                 info->signals &= ~(SerialSignal_RTS + SerialSignal_DTR);
 767                 spin_lock_irqsave(&info->lock,flags);
 768                 set_signals(info);
 769                 spin_unlock_irqrestore(&info->lock,flags);
 770         }
 771
 772         /* Handle transition away from B0 status */
 773         if (!(old_termios->c_cflag & CBAUD) &&
 774             tty->termios->c_cflag & CBAUD) {
 775                 info->signals |= SerialSignal_DTR;
 776                 if (!(tty->termios->c_cflag & CRTSCTS) ||
 777                     !test_bit(TTY_THROTTLED, &tty->flags)) {
 778                         info->signals |= SerialSignal_RTS;
 779                 }
 780                 spin_lock_irqsave(&info->lock,flags);
 781                 set_signals(info);
 782                 spin_unlock_irqrestore(&info->lock,flags);
 783         }
 784
 785         /* Handle turning off CRTSCTS */
 786         if (old_termios->c_cflag & CRTSCTS &&
 787             !(tty->termios->c_cflag & CRTSCTS)) {
 788                 tty->hw_stopped = 0;
 789                 tx_release(tty);
 790         }
 791 }
 792
 793 static int write(struct tty_struct *tty,
 794                  const unsigned char *buf, int count)
 795 {
 796         int ret = 0;
 797         struct slgt_info *info = tty->driver_data;
 798         unsigned long flags;
 799         unsigned int bufs_needed;
 800
 801         if (sanity_check(info, tty->name, "write"))
 802                 goto cleanup;
 803         DBGINFO(("%s write count=%d\n", info->device_name, count));
 804
 805         if (!info->tx_buf)
 806                 goto cleanup;
 807
 808         if (count > info->max_frame_size) {
 809                 ret = -EIO;
 810                 goto cleanup;
 811         }
 812
 813         if (!count)
 814                 goto cleanup;
 815
 816         if (!info->tx_active && info->tx_count) {
 817                 /* send accumulated data from send_char() */
 818                 tx_load(info, info->tx_buf, info->tx_count);
 819                 goto start;
 820         }
 821         bufs_needed = (count/DMABUFSIZE);
 822         if (count % DMABUFSIZE)
 823                 ++bufs_needed;
 824         if (bufs_needed > free_tbuf_count(info))
 825                 goto cleanup;
 826
 827         ret = info->tx_count = count;
 828         tx_load(info, buf, count);
 829         goto start;
 830
 831 start:
 832         if (info->tx_count && !tty->stopped && !tty->hw_stopped) {
 833                 spin_lock_irqsave(&info->lock,flags);
 834                 if (!info->tx_active)
 835                         tx_start(info);
 836                 else
 837                         tdma_start(info);
 838                 spin_unlock_irqrestore(&info->lock,flags);
 839         }
 840
 841 cleanup:
 842         DBGINFO(("%s write rc=%d\n", info->device_name, ret));
 843         return ret;
 844 }
 845
 846 static int put_char(struct tty_struct *tty, unsigned char ch)
 847 {
 848         struct slgt_info *info = tty->driver_data;
 849         unsigned long flags;
 850         int ret = 0;
 851
 852         if (sanity_check(info, tty->name, "put_char"))
 853                 return 0;
 854         DBGINFO(("%s put_char(%d)\n", info->device_name, ch));
 855         if (!info->tx_buf)
 856                 return 0;
 857         spin_lock_irqsave(&info->lock,flags);
 858         if (!info->tx_active && (info->tx_count < info->max_frame_size)) {
 859                 info->tx_buf[info->tx_count++] = ch;
 860                 ret = 1;
 861         }
 862         spin_unlock_irqrestore(&info->lock,flags);
 863         return ret;
 864 }
 865
 866 static void send_xchar(struct tty_struct *tty, char ch)
 867 {
 868         struct slgt_info *info = tty->driver_data;
 869         unsigned long flags;
 870
 871         if (sanity_check(info, tty->name, "send_xchar"))
 872                 return;
 873         DBGINFO(("%s send_xchar(%d)\n", info->device_name, ch));
 874         info->x_char = ch;
 875         if (ch) {
 876                 spin_lock_irqsave(&info->lock,flags);
 877                 if (!info->tx_enabled)
 878                         tx_start(info);
 879                 spin_unlock_irqrestore(&info->lock,flags);
 880         }
 881 }
 882
 883 static void wait_until_sent(struct tty_struct *tty, int timeout)
 884 {
 885         struct slgt_info *info = tty->driver_data;
 886         unsigned long orig_jiffies, char_time;
 887
 888         if (!info )
 889                 return;
 890         if (sanity_check(info, tty->name, "wait_until_sent"))
 891                 return;
 892         DBGINFO(("%s wait_until_sent entry\n", info->device_name));
 893         if (!(info->port.flags & ASYNC_INITIALIZED))
 894                 goto exit;
 895
 896         orig_jiffies = jiffies;
 897
 898         /* Set check interval to 1/5 of estimated time to
 899          * send a character, and make it at least 1. The check
 900          * interval should also be less than the timeout.
 901          * Note: use tight timings here to satisfy the NIST-PCTS.
 902          */
 903
 904         lock_kernel();
 905
 906         if (info->params.data_rate) {
 907                 char_time = info->timeout/(32 * 5);
 908                 if (!char_time)
 909                         char_time++;
 910         } else
 911                 char_time = 1;
 912
 913         if (timeout)
 914                 char_time = min_t(unsigned long, char_time, timeout);
 915
 916         while (info->tx_active) {
 917                 msleep_interruptible(jiffies_to_msecs(char_time));
 918                 if (signal_pending(current))
 919                         break;
 920                 if (timeout && time_after(jiffies, orig_jiffies + timeout))
 921                         break;
 922         }
 923         unlock_kernel();
 924
 925 exit:
 926         DBGINFO(("%s wait_until_sent exit\n", info->device_name));
 927 }
 928
 929 static int write_room(struct tty_struct *tty)
 930 {
 931         struct slgt_info *info = tty->driver_data;
 932         int ret;
 933
 934         if (sanity_check(info, tty->name, "write_room"))
 935                 return 0;
 936         ret = (info->tx_active) ? 0 : HDLC_MAX_FRAME_SIZE;
 937         DBGINFO(("%s write_room=%d\n", info->device_name, ret));
 938         return ret;
 939 }
 940
 941 static void flush_chars(struct tty_struct *tty)
 942 {
 943         struct slgt_info *info = tty->driver_data;
 944         unsigned long flags;
 945
 946         if (sanity_check(info, tty->name, "flush_chars"))
 947                 return;
 948         DBGINFO(("%s flush_chars entry tx_count=%d\n", info->device_name, info->tx_count));
 949
 950         if (info->tx_count <= 0 || tty->stopped ||
 951             tty->hw_stopped || !info->tx_buf)
 952                 return;
 953
 954         DBGINFO(("%s flush_chars start transmit\n", info->device_name));
 955
 956         spin_lock_irqsave(&info->lock,flags);
 957         if (!info->tx_active && info->tx_count) {
 958                 tx_load(info, info->tx_buf,info->tx_count);
 959                 tx_start(info);
 960         }
 961         spin_unlock_irqrestore(&info->lock,flags);
 962 }
 963
 964 static void flush_buffer(struct tty_struct *tty)
 965 {
 966         struct slgt_info *info = tty->driver_data;
 967         unsigned long flags;
 968
 969         if (sanity_check(info, tty->name, "flush_buffer"))
 970                 return;
 971         DBGINFO(("%s flush_buffer\n", info->device_name));
 972
 973         spin_lock_irqsave(&info->lock,flags);
 974         if (!info->tx_active)
 975                 info->tx_count = 0;
 976         spin_unlock_irqrestore(&info->lock,flags);
 977
 978         tty_wakeup(tty);
 979 }
 980
 981 /*
 982  * throttle (stop) transmitter
 983  */
 984 static void tx_hold(struct tty_struct *tty)
 985 {
 986         struct slgt_info *info = tty->driver_data;
 987         unsigned long flags;
 988
 989         if (sanity_check(info, tty->name, "tx_hold"))
 990                 return;
 991         DBGINFO(("%s tx_hold\n", info->device_name));
 992         spin_lock_irqsave(&info->lock,flags);
 993         if (info->tx_enabled && info->params.mode == MGSL_MODE_ASYNC)
 994                 tx_stop(info);
 995         spin_unlock_irqrestore(&info->lock,flags);
 996 }
 997
 998 /*
 999  * release (start) transmitter
1000  */
1001 static void tx_release(struct tty_struct *tty)
1002 {
1003         struct slgt_info *info = tty->driver_data;
1004         unsigned long flags;
1005
1006         if (sanity_check(info, tty->name, "tx_release"))
1007                 return;
1008         DBGINFO(("%s tx_release\n", info->device_name));
1009         spin_lock_irqsave(&info->lock,flags);
1010         if (!info->tx_active && info->tx_count) {
1011                 tx_load(info, info->tx_buf, info->tx_count);
1012                 tx_start(info);
1013         }
1014         spin_unlock_irqrestore(&info->lock,flags);
1015 }
1016
1017 /*
1018  * Service an IOCTL request
1019  *
1020  * Arguments
1021  *
1022  *      tty     pointer to tty instance data
1023  *      file    pointer to associated file object for device
1024  *      cmd     IOCTL command code
1025  *      arg     command argument/context
1026  *
1027  * Return 0 if success, otherwise error code
1028  */
1029 static int ioctl(struct tty_struct *tty, struct file *file,
1030                  unsigned int cmd, unsigned long arg)
1031 {
1032         struct slgt_info *info = tty->driver_data;
1033         struct mgsl_icount cnow;        /* kernel counter temps */
1034         struct serial_icounter_struct __user *p_cuser;  /* user space */
1035         unsigned long flags;
1036         void __user *argp = (void __user *)arg;
1037         int ret;
1038
1039         if (sanity_check(info, tty->name, "ioctl"))
1040                 return -ENODEV;
1041         DBGINFO(("%s ioctl() cmd=%08X\n", info->device_name, cmd));
1042
1043         if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
1044             (cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT)) {
1045                 if (tty->flags & (1 << TTY_IO_ERROR))
1046                     return -EIO;
1047         }
1048
1049         lock_kernel();
1050
1051         switch (cmd) {
1052         case MGSL_IOCGPARAMS:
1053                 ret = get_params(info, argp);
1054                 break;
1055         case MGSL_IOCSPARAMS:
1056                 ret = set_params(info, argp);
1057                 break;
1058         case MGSL_IOCGTXIDLE:
1059                 ret = get_txidle(info, argp);
1060                 break;
1061         case MGSL_IOCSTXIDLE:
1062                 ret = set_txidle(info, (int)arg);
1063                 break;
1064         case MGSL_IOCTXENABLE:
1065                 ret = tx_enable(info, (int)arg);
1066                 break;
1067         case MGSL_IOCRXENABLE:
1068                 ret = rx_enable(info, (int)arg);
1069                 break;
1070         case MGSL_IOCTXABORT:
1071                 ret = tx_abort(info);
1072                 break;
1073         case MGSL_IOCGSTATS:
1074                 ret = get_stats(info, argp);
1075                 break;
1076         case MGSL_IOCWAITEVENT:
1077                 ret = wait_mgsl_event(info, argp);
1078                 break;
1079         case TIOCMIWAIT:
1080                 ret = modem_input_wait(info,(int)arg);
1081                 break;
1082         case MGSL_IOCGIF:
1083                 ret = get_interface(info, argp);
1084                 break;
1085         case MGSL_IOCSIF:
1086                 ret = set_interface(info,(int)arg);
1087                 break;
1088         case MGSL_IOCSGPIO:
1089                 ret = set_gpio(info, argp);
1090                 break;
1091         case MGSL_IOCGGPIO:
1092                 ret = get_gpio(info, argp);
1093                 break;
1094         case MGSL_IOCWAITGPIO:
1095                 ret = wait_gpio(info, argp);
1096                 break;
1097         case TIOCGICOUNT:
1098                 spin_lock_irqsave(&info->lock,flags);
1099                 cnow = info->icount;
1100                 spin_unlock_irqrestore(&info->lock,flags);
1101                 p_cuser = argp;
1102                 if (put_user(cnow.cts, &p_cuser->cts) ||
1103                     put_user(cnow.dsr, &p_cuser->dsr) ||
1104                     put_user(cnow.rng, &p_cuser->rng) ||
1105                     put_user(cnow.dcd, &p_cuser->dcd) ||
1106                     put_user(cnow.rx, &p_cuser->rx) ||
1107                     put_user(cnow.tx, &p_cuser->tx) ||
1108                     put_user(cnow.frame, &p_cuser->frame) ||
1109                     put_user(cnow.overrun, &p_cuser->overrun) ||
1110                     put_user(cnow.parity, &p_cuser->parity) ||
1111                     put_user(cnow.brk, &p_cuser->brk) ||
1112                     put_user(cnow.buf_overrun, &p_cuser->buf_overrun))
1113                         ret = -EFAULT;
1114                 ret = 0;
1115                 break;
1116         default:
1117                 ret = -ENOIOCTLCMD;
1118         }
1119         unlock_kernel();
1120         return ret;
1121 }
1122
1123 /*
1124  * support for 32 bit ioctl calls on 64 bit systems
1125  */
1126 #ifdef CONFIG_COMPAT
1127 static long get_params32(struct slgt_info *info, struct MGSL_PARAMS32 __user *user_params)
1128 {
1129         struct MGSL_PARAMS32 tmp_params;
1130
1131         DBGINFO(("%s get_params32\n", info->device_name));
1132         tmp_params.mode            = (compat_ulong_t)info->params.mode;
1133         tmp_params.loopback        = info->params.loopback;
1134         tmp_params.flags           = info->params.flags;
1135         tmp_params.encoding        = info->params.encoding;
1136         tmp_params.clock_speed     = (compat_ulong_t)info->params.clock_speed;
1137         tmp_params.addr_filter     = info->params.addr_filter;
1138         tmp_params.crc_type        = info->params.crc_type;
1139         tmp_params.preamble_length = info->params.preamble_length;
1140         tmp_params.preamble        = info->params.preamble;
1141         tmp_params.data_rate       = (compat_ulong_t)info->params.data_rate;
1142         tmp_params.data_bits       = info->params.data_bits;
1143         tmp_params.stop_bits       = info->params.stop_bits;
1144         tmp_params.parity          = info->params.parity;
1145         if (copy_to_user(user_params, &tmp_params, sizeof(struct MGSL_PARAMS32)))
1146                 return -EFAULT;
1147         return 0;
1148 }
1149
1150 static long set_params32(struct slgt_info *info, struct MGSL_PARAMS32 __user *new_params)
1151 {
1152         struct MGSL_PARAMS32 tmp_params;
1153
1154         DBGINFO(("%s set_params32\n", info->device_name));
1155         if (copy_from_user(&tmp_params, new_params, sizeof(struct MGSL_PARAMS32)))
1156                 return -EFAULT;
1157
1158         spin_lock(&info->lock);
1159         info->params.mode            = tmp_params.mode;
1160         info->params.loopback        = tmp_params.loopback;
1161         info->params.flags           = tmp_params.flags;
1162         info->params.encoding        = tmp_params.encoding;
1163         info->params.clock_speed     = tmp_params.clock_speed;
1164         info->params.addr_filter     = tmp_params.addr_filter;
1165         info->params.crc_type        = tmp_params.crc_type;
1166         info->params.preamble_length = tmp_params.preamble_length;
1167         info->params.preamble        = tmp_params.preamble;
1168         info->params.data_rate       = tmp_params.data_rate;
1169         info->params.data_bits       = tmp_params.data_bits;
1170         info->params.stop_bits       = tmp_params.stop_bits;
1171         info->params.parity          = tmp_params.parity;
1172         spin_unlock(&info->lock);
1173
1174         change_params(info);
1175
1176         return 0;
1177 }
1178
1179 static long slgt_compat_ioctl(struct tty_struct *tty, struct file *file,
1180                          unsigned int cmd, unsigned long arg)
1181 {
1182         struct slgt_info *info = tty->driver_data;
1183         int rc = -ENOIOCTLCMD;
1184
1185         if (sanity_check(info, tty->name, "compat_ioctl"))
1186                 return -ENODEV;
1187         DBGINFO(("%s compat_ioctl() cmd=%08X\n", info->device_name, cmd));
1188
1189         switch (cmd) {
1190
1191         case MGSL_IOCSPARAMS32:
1192                 rc = set_params32(info, compat_ptr(arg));
1193                 break;
1194
1195         case MGSL_IOCGPARAMS32:
1196                 rc = get_params32(info, compat_ptr(arg));
1197                 break;
1198
1199         case MGSL_IOCGPARAMS:
1200         case MGSL_IOCSPARAMS:
1201         case MGSL_IOCGTXIDLE:
1202         case MGSL_IOCGSTATS:
1203         case MGSL_IOCWAITEVENT:
1204         case MGSL_IOCGIF:
1205         case MGSL_IOCSGPIO:
1206         case MGSL_IOCGGPIO:
1207         case MGSL_IOCWAITGPIO:
1208         case TIOCGICOUNT:
1209                 rc = ioctl(tty, file, cmd, (unsigned long)(compat_ptr(arg)));
1210                 break;
1211
1212         case MGSL_IOCSTXIDLE:
1213         case MGSL_IOCTXENABLE:
1214         case MGSL_IOCRXENABLE:
1215         case MGSL_IOCTXABORT:
1216         case TIOCMIWAIT:
1217         case MGSL_IOCSIF:
1218                 rc = ioctl(tty, file, cmd, arg);
1219                 break;
1220         }
1221
1222         DBGINFO(("%s compat_ioctl() cmd=%08X rc=%d\n", info->device_name, cmd, rc));
1223         return rc;
1224 }
1225 #else
1226 #define slgt_compat_ioctl NULL
1227 #endif /* ifdef CONFIG_COMPAT */
1228
1229 /*
1230  * proc fs support
1231  */
1232 static inline int line_info(char *buf, struct slgt_info *info)
1233 {
1234         char stat_buf[30];
1235         int ret;
1236         unsigned long flags;
1237
1238         ret = sprintf(buf, "%s: IO=%08X IRQ=%d MaxFrameSize=%u\n",
1239                       info->device_name, info->phys_reg_addr,
1240                       info->irq_level, info->max_frame_size);
1241
1242         /* output current serial signal states */
1243         spin_lock_irqsave(&info->lock,flags);
1244         get_signals(info);
1245         spin_unlock_irqrestore(&info->lock,flags);
1246
1247         stat_buf[0] = 0;
1248         stat_buf[1] = 0;
1249         if (info->signals & SerialSignal_RTS)
1250                 strcat(stat_buf, "|RTS");
1251         if (info->signals & SerialSignal_CTS)
1252                 strcat(stat_buf, "|CTS");
1253         if (info->signals & SerialSignal_DTR)
1254                 strcat(stat_buf, "|DTR");
1255         if (info->signals & SerialSignal_DSR)
1256                 strcat(stat_buf, "|DSR");
1257         if (info->signals & SerialSignal_DCD)
1258                 strcat(stat_buf, "|CD");
1259         if (info->signals & SerialSignal_RI)
1260                 strcat(stat_buf, "|RI");
1261
1262         if (info->params.mode != MGSL_MODE_ASYNC) {
1263                 ret += sprintf(buf+ret, "\tHDLC txok:%d rxok:%d",
1264                                info->icount.txok, info->icount.rxok);
1265                 if (info->icount.txunder)
1266                         ret += sprintf(buf+ret, " txunder:%d", info->icount.txunder);
1267                 if (info->icount.txabort)
1268                         ret += sprintf(buf+ret, " txabort:%d", info->icount.txabort);
1269                 if (info->icount.rxshort)
1270                         ret += sprintf(buf+ret, " rxshort:%d", info->icount.rxshort);
1271                 if (info->icount.rxlong)
1272                         ret += sprintf(buf+ret, " rxlong:%d", info->icount.rxlong);
1273                 if (info->icount.rxover)
1274                         ret += sprintf(buf+ret, " rxover:%d", info->icount.rxover);
1275                 if (info->icount.rxcrc)
1276                         ret += sprintf(buf+ret, " rxcrc:%d", info->icount.rxcrc);
1277         } else {
1278                 ret += sprintf(buf+ret, "\tASYNC tx:%d rx:%d",
1279                                info->icount.tx, info->icount.rx);
1280                 if (info->icount.frame)
1281                         ret += sprintf(buf+ret, " fe:%d", info->icount.frame);
1282                 if (info->icount.parity)
1283                         ret += sprintf(buf+ret, " pe:%d", info->icount.parity);
1284                 if (info->icount.brk)
1285                         ret += sprintf(buf+ret, " brk:%d", info->icount.brk);
1286                 if (info->icount.overrun)
1287                         ret += sprintf(buf+ret, " oe:%d", info->icount.overrun);
1288         }
1289
1290         /* Append serial signal status to end */
1291         ret += sprintf(buf+ret, " %s\n", stat_buf+1);
1292
1293         ret += sprintf(buf+ret, "\ttxactive=%d bh_req=%d bh_run=%d pending_bh=%x\n",
1294                        info->tx_active,info->bh_requested,info->bh_running,
1295                        info->pending_bh);
1296
1297         return ret;
1298 }
1299
1300 /* Called to print information about devices
1301  */
1302 static int read_proc(char *page, char **start, off_t off, int count,
1303                      int *eof, void *data)
1304 {
1305         int len = 0, l;
1306         off_t   begin = 0;
1307         struct slgt_info *info;
1308
1309         len += sprintf(page, "synclink_gt driver\n");
1310
1311         info = slgt_device_list;
1312         while( info ) {
1313                 l = line_info(page + len, info);
1314                 len += l;
1315                 if (len+begin > off+count)
1316                         goto done;
1317                 if (len+begin < off) {
1318                         begin += len;
1319                         len = 0;
1320                 }
1321                 info = info->next_device;
1322         }
1323
1324         *eof = 1;
1325 done:
1326         if (off >= len+begin)
1327                 return 0;
1328         *start = page + (off-begin);
1329         return ((count < begin+len-off) ? count : begin+len-off);
1330 }
1331
1332 /*
1333  * return count of bytes in transmit buffer
1334  */
1335 static int chars_in_buffer(struct tty_struct *tty)
1336 {
1337         struct slgt_info *info = tty->driver_data;
1338         int count;
1339         if (sanity_check(info, tty->name, "chars_in_buffer"))
1340                 return 0;
1341         count = tbuf_bytes(info);
1342         DBGINFO(("%s chars_in_buffer()=%d\n", info->device_name, count));
1343         return count;
1344 }
1345
1346 /*
1347  * signal remote device to throttle send data (our receive data)
1348  */
1349 static void throttle(struct tty_struct * tty)
1350 {
1351         struct slgt_info *info = tty->driver_data;
1352         unsigned long flags;
1353
1354         if (sanity_check(info, tty->name, "throttle"))
1355                 return;
1356         DBGINFO(("%s throttle\n", info->device_name));
1357         if (I_IXOFF(tty))
1358                 send_xchar(tty, STOP_CHAR(tty));
1359         if (tty->termios->c_cflag & CRTSCTS) {
1360                 spin_lock_irqsave(&info->lock,flags);
1361                 info->signals &= ~SerialSignal_RTS;
1362                 set_signals(info);
1363                 spin_unlock_irqrestore(&info->lock,flags);
1364         }
1365 }
1366
1367 /*
1368  * signal remote device to stop throttling send data (our receive data)
1369  */
1370 static void unthrottle(struct tty_struct * tty)
1371 {
1372         struct slgt_info *info = tty->driver_data;
1373         unsigned long flags;
1374
1375         if (sanity_check(info, tty->name, "unthrottle"))
1376                 return;
1377         DBGINFO(("%s unthrottle\n", info->device_name));
1378         if (I_IXOFF(tty)) {
1379                 if (info->x_char)
1380                         info->x_char = 0;
1381                 else
1382                         send_xchar(tty, START_CHAR(tty));
1383         }
1384         if (tty->termios->c_cflag & CRTSCTS) {
1385                 spin_lock_irqsave(&info->lock,flags);
1386                 info->signals |= SerialSignal_RTS;
1387                 set_signals(info);
1388                 spin_unlock_irqrestore(&info->lock,flags);
1389         }
1390 }
1391
1392 /*
1393  * set or clear transmit break condition
1394  * break_state  -1=set break condition, 0=clear
1395  */
1396 static int set_break(struct tty_struct *tty, int break_state)
1397 {
1398         struct slgt_info *info = tty->driver_data;
1399         unsigned short value;
1400         unsigned long flags;
1401
1402         if (sanity_check(info, tty->name, "set_break"))
1403                 return -EINVAL;
1404         DBGINFO(("%s set_break(%d)\n", info->device_name, break_state));
1405
1406         spin_lock_irqsave(&info->lock,flags);
1407         value = rd_reg16(info, TCR);
1408         if (break_state == -1)
1409                 value |= BIT6;
1410         else
1411                 value &= ~BIT6;
1412         wr_reg16(info, TCR, value);
1413         spin_unlock_irqrestore(&info->lock,flags);
1414         return 0;
1415 }
1416
1417 #if SYNCLINK_GENERIC_HDLC
1418
1419 /**
1420  * called by generic HDLC layer when protocol selected (PPP, frame relay, etc.)
1421  * set encoding and frame check sequence (FCS) options
1422  *
1423  * dev       pointer to network device structure
1424  * encoding  serial encoding setting
1425  * parity    FCS setting
1426  *
1427  * returns 0 if success, otherwise error code
1428  */
1429 static int hdlcdev_attach(struct net_device *dev, unsigned short encoding,
1430                           unsigned short parity)
1431 {
1432         struct slgt_info *info = dev_to_port(dev);
1433         unsigned char  new_encoding;
1434         unsigned short new_crctype;
1435
1436         /* return error if TTY interface open */
1437         if (info->port.count)
1438                 return -EBUSY;
1439
1440         DBGINFO(("%s hdlcdev_attach\n", info->device_name));
1441
1442         switch (encoding)
1443         {
1444         case ENCODING_NRZ:        new_encoding = HDLC_ENCODING_NRZ; break;
1445         case ENCODING_NRZI:       new_encoding = HDLC_ENCODING_NRZI_SPACE; break;
1446         case ENCODING_FM_MARK:    new_encoding = HDLC_ENCODING_BIPHASE_MARK; break;
1447         case ENCODING_FM_SPACE:   new_encoding = HDLC_ENCODING_BIPHASE_SPACE; break;
1448         case ENCODING_MANCHESTER: new_encoding = HDLC_ENCODING_BIPHASE_LEVEL; break;
1449         default: return -EINVAL;
1450         }
1451
1452         switch (parity)
1453         {
1454         case PARITY_NONE:            new_crctype = HDLC_CRC_NONE; break;
1455         case PARITY_CRC16_PR1_CCITT: new_crctype = HDLC_CRC_16_CCITT; break;
1456         case PARITY_CRC32_PR1_CCITT: new_crctype = HDLC_CRC_32_CCITT; break;
1457         default: return -EINVAL;
1458         }
1459
1460         info->params.encoding = new_encoding;
1461         info->params.crc_type = new_crctype;
1462
1463         /* if network interface up, reprogram hardware */
1464         if (info->netcount)
1465                 program_hw(info);
1466
1467         return 0;
1468 }
1469
1470 /**
1471  * called by generic HDLC layer to send frame
1472  *
1473  * skb  socket buffer containing HDLC frame
1474  * dev  pointer to network device structure
1475  *
1476  * returns 0 if success, otherwise error code
1477  */
1478 static int hdlcdev_xmit(struct sk_buff *skb, struct net_device *dev)
1479 {
1480         struct slgt_info *info = dev_to_port(dev);
1481         unsigned long flags;
1482
1483         DBGINFO(("%s hdlc_xmit\n", dev->name));
1484
1485         /* stop sending until this frame completes */
1486         netif_stop_queue(dev);
1487
1488         /* copy data to device buffers */
1489         info->tx_count = skb->len;
1490         tx_load(info, skb->data, skb->len);
1491
1492         /* update network statistics */
1493         dev->stats.tx_packets++;
1494         dev->stats.tx_bytes += skb->len;
1495
1496         /* done with socket buffer, so free it */
1497         dev_kfree_skb(skb);
1498
1499         /* save start time for transmit timeout detection */
1500         dev->trans_start = jiffies;
1501
1502         /* start hardware transmitter if necessary */
1503         spin_lock_irqsave(&info->lock,flags);
1504         if (!info->tx_active)
1505                 tx_start(info);
1506         spin_unlock_irqrestore(&info->lock,flags);
1507
1508         return 0;
1509 }
1510
1511 /**
1512  * called by network layer when interface enabled
1513  * claim resources and initialize hardware
1514  *
1515  * dev  pointer to network device structure
1516  *
1517  * returns 0 if success, otherwise error code
1518  */
1519 static int hdlcdev_open(struct net_device *dev)
1520 {
1521         struct slgt_info *info = dev_to_port(dev);
1522         int rc;
1523         unsigned long flags;
1524
1525         if (!try_module_get(THIS_MODULE))
1526                 return -EBUSY;
1527
1528         DBGINFO(("%s hdlcdev_open\n", dev->name));
1529
1530         /* generic HDLC layer open processing */
1531         if ((rc = hdlc_open(dev)))
1532                 return rc;
1533
1534         /* arbitrate between network and tty opens */
1535         spin_lock_irqsave(&info->netlock, flags);
1536         if (info->port.count != 0 || info->netcount != 0) {
1537                 DBGINFO(("%s hdlc_open busy\n", dev->name));
1538                 spin_unlock_irqrestore(&info->netlock, flags);
1539                 return -EBUSY;
1540         }
1541         info->netcount=1;
1542         spin_unlock_irqrestore(&info->netlock, flags);
1543
1544         /* claim resources and init adapter */
1545         if ((rc = startup(info)) != 0) {
1546                 spin_lock_irqsave(&info->netlock, flags);
1547                 info->netcount=0;
1548                 spin_unlock_irqrestore(&info->netlock, flags);
1549                 return rc;
1550         }
1551
1552         /* assert DTR and RTS, apply hardware settings */
1553         info->signals |= SerialSignal_RTS + SerialSignal_DTR;
1554         program_hw(info);
1555
1556         /* enable network layer transmit */
1557         dev->trans_start = jiffies;
1558         netif_start_queue(dev);
1559
1560         /* inform generic HDLC layer of current DCD status */
1561         spin_lock_irqsave(&info->lock, flags);
1562         get_signals(info);
1563         spin_unlock_irqrestore(&info->lock, flags);
1564         if (info->signals & SerialSignal_DCD)
1565                 netif_carrier_on(dev);
1566         else
1567                 netif_carrier_off(dev);
1568         return 0;
1569 }
1570
1571 /**
1572  * called by network layer when interface is disabled
1573  * shutdown hardware and release resources
1574  *
1575  * dev  pointer to network device structure
1576  *
1577  * returns 0 if success, otherwise error code
1578  */
1579 static int hdlcdev_close(struct net_device *dev)
1580 {
1581         struct slgt_info *info = dev_to_port(dev);
1582         unsigned long flags;
1583
1584         DBGINFO(("%s hdlcdev_close\n", dev->name));
1585
1586         netif_stop_queue(dev);
1587
1588         /* shutdown adapter and release resources */
1589         shutdown(info);
1590
1591         hdlc_close(dev);
1592
1593         spin_lock_irqsave(&info->netlock, flags);
1594         info->netcount=0;
1595         spin_unlock_irqrestore(&info->netlock, flags);
1596
1597         module_put(THIS_MODULE);
1598         return 0;
1599 }
1600
1601 /**
1602  * called by network layer to process IOCTL call to network device
1603  *
1604  * dev  pointer to network device structure
1605  * ifr  pointer to network interface request structure
1606  * cmd  IOCTL command code
1607  *
1608  * returns 0 if success, otherwise error code
1609  */
1610 static int hdlcdev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
1611 {
1612         const size_t size = sizeof(sync_serial_settings);
1613         sync_serial_settings new_line;
1614         sync_serial_settings __user *line = ifr->ifr_settings.ifs_ifsu.sync;
1615         struct slgt_info *info = dev_to_port(dev);
1616         unsigned int flags;
1617
1618         DBGINFO(("%s hdlcdev_ioctl\n", dev->name));
1619
1620         /* return error if TTY interface open */
1621         if (info->port.count)
1622                 return -EBUSY;
1623
1624         if (cmd != SIOCWANDEV)
1625                 return hdlc_ioctl(dev, ifr, cmd);
1626
1627         switch(ifr->ifr_settings.type) {
1628         case IF_GET_IFACE: /* return current sync_serial_settings */
1629
1630                 ifr->ifr_settings.type = IF_IFACE_SYNC_SERIAL;
1631                 if (ifr->ifr_settings.size < size) {
1632                         ifr->ifr_settings.size = size; /* data size wanted */
1633                         return -ENOBUFS;
1634                 }
1635
1636                 flags = info->params.flags & (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
1637                                               HDLC_FLAG_RXC_BRG    | HDLC_FLAG_RXC_TXCPIN |
1638                                               HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
1639                                               HDLC_FLAG_TXC_BRG    | HDLC_FLAG_TXC_RXCPIN);
1640
1641                 switch (flags){
1642                 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN): new_line.clock_type = CLOCK_EXT; break;
1643                 case (HDLC_FLAG_RXC_BRG    | HDLC_FLAG_TXC_BRG):    new_line.clock_type = CLOCK_INT; break;
1644                 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG):    new_line.clock_type = CLOCK_TXINT; break;
1645                 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN): new_line.clock_type = CLOCK_TXFROMRX; break;
1646                 default: new_line.clock_type = CLOCK_DEFAULT;
1647                 }
1648
1649                 new_line.clock_rate = info->params.clock_speed;
1650                 new_line.loopback   = info->params.loopback ? 1:0;
1651
1652                 if (copy_to_user(line, &new_line, size))
1653                         return -EFAULT;
1654                 return 0;
1655
1656         case IF_IFACE_SYNC_SERIAL: /* set sync_serial_settings */
1657
1658                 if(!capable(CAP_NET_ADMIN))
1659                         return -EPERM;
1660                 if (copy_from_user(&new_line, line, size))
1661                         return -EFAULT;
1662
1663                 switch (new_line.clock_type)
1664                 {
1665                 case CLOCK_EXT:      flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN; break;
1666                 case CLOCK_TXFROMRX: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN; break;
1667                 case CLOCK_INT:      flags = HDLC_FLAG_RXC_BRG    | HDLC_FLAG_TXC_BRG;    break;
1668                 case CLOCK_TXINT:    flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG;    break;
1669                 case CLOCK_DEFAULT:  flags = info->params.flags &
1670                                              (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
1671                                               HDLC_FLAG_RXC_BRG    | HDLC_FLAG_RXC_TXCPIN |
1672                                               HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
1673                                               HDLC_FLAG_TXC_BRG    | HDLC_FLAG_TXC_RXCPIN); break;
1674                 default: return -EINVAL;
1675                 }
1676
1677                 if (new_line.loopback != 0 && new_line.loopback != 1)
1678                         return -EINVAL;
1679
1680                 info->params.flags &= ~(HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
1681                                         HDLC_FLAG_RXC_BRG    | HDLC_FLAG_RXC_TXCPIN |
1682                                         HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
1683                                         HDLC_FLAG_TXC_BRG    | HDLC_FLAG_TXC_RXCPIN);
1684                 info->params.flags |= flags;
1685
1686                 info->params.loopback = new_line.loopback;
1687
1688                 if (flags & (HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG))
1689                         info->params.clock_speed = new_line.clock_rate;
1690                 else
1691                         info->params.clock_speed = 0;
1692
1693                 /* if network interface up, reprogram hardware */
1694                 if (info->netcount)
1695                         program_hw(info);
1696                 return 0;
1697
1698         default:
1699                 return hdlc_ioctl(dev, ifr, cmd);
1700         }
1701 }
1702
1703 /**
1704  * called by network layer when transmit timeout is detected
1705  *
1706  * dev  pointer to network device structure
1707  */
1708 static void hdlcdev_tx_timeout(struct net_device *dev)
1709 {
1710         struct slgt_info *info = dev_to_port(dev);
1711         unsigned long flags;
1712
1713         DBGINFO(("%s hdlcdev_tx_timeout\n", dev->name));
1714
1715         dev->stats.tx_errors++;
1716         dev->stats.tx_aborted_errors++;
1717
1718         spin_lock_irqsave(&info->lock,flags);
1719         tx_stop(info);
1720         spin_unlock_irqrestore(&info->lock,flags);
1721
1722         netif_wake_queue(dev);
1723 }
1724
1725 /**
1726  * called by device driver when transmit completes
1727  * reenable network layer transmit if stopped
1728  *
1729  * info  pointer to device instance information
1730  */
1731 static void hdlcdev_tx_done(struct slgt_info *info)
1732 {
1733         if (netif_queue_stopped(info->netdev))
1734                 netif_wake_queue(info->netdev);
1735 }
1736
1737 /**
1738  * called by device driver when frame received
1739  * pass frame to network layer
1740  *
1741  * info  pointer to device instance information
1742  * buf   pointer to buffer contianing frame data
1743  * size  count of data bytes in buf
1744  */
1745 static void hdlcdev_rx(struct slgt_info *info, char *buf, int size)
1746 {
1747         struct sk_buff *skb = dev_alloc_skb(size);
1748         struct net_device *dev = info->netdev;
1749
1750         DBGINFO(("%s hdlcdev_rx\n", dev->name));
1751
1752         if (skb == NULL) {
1753                 DBGERR(("%s: can't alloc skb, drop packet\n", dev->name));
1754                 dev->stats.rx_dropped++;
1755                 return;
1756         }
1757
1758         memcpy(skb_put(skb, size), buf, size);
1759
1760         skb->protocol = hdlc_type_trans(skb, dev);
1761
1762         dev->stats.rx_packets++;
1763         dev->stats.rx_bytes += size;
1764
1765         netif_rx(skb);
1766 }
1767
1768 static const struct net_device_ops hdlcdev_ops = {
1769         .ndo_open       = hdlcdev_open,
1770         .ndo_stop       = hdlcdev_close,
1771         .ndo_change_mtu = hdlc_change_mtu,
1772         .ndo_start_xmit = hdlc_start_xmit,
1773         .ndo_do_ioctl   = hdlcdev_ioctl,
1774         .ndo_tx_timeout = hdlcdev_tx_timeout,
1775 };
1776
1777 /**
1778  * called by device driver when adding device instance
1779  * do generic HDLC initialization
1780  *
1781  * info  pointer to device instance information
1782  *
1783  * returns 0 if success, otherwise error code
1784  */
1785 static int hdlcdev_init(struct slgt_info *info)
1786 {
1787         int rc;
1788         struct net_device *dev;
1789         hdlc_device *hdlc;
1790
1791         /* allocate and initialize network and HDLC layer objects */
1792
1793         if (!(dev = alloc_hdlcdev(info))) {
1794                 printk(KERN_ERR "%s hdlc device alloc failure\n", info->device_name);
1795                 return -ENOMEM;
1796         }
1797
1798         /* for network layer reporting purposes only */
1799         dev->mem_start = info->phys_reg_addr;
1800         dev->mem_end   = info->phys_reg_addr + SLGT_REG_SIZE - 1;
1801         dev->irq       = info->irq_level;
1802
1803         /* network layer callbacks and settings */
1804         dev->netdev_ops     = &hdlcdev_ops;
1805         dev->watchdog_timeo = 10 * HZ;
1806         dev->tx_queue_len   = 50;
1807
1808         /* generic HDLC layer callbacks and settings */
1809         hdlc         = dev_to_hdlc(dev);
1810         hdlc->attach = hdlcdev_attach;
1811         hdlc->xmit   = hdlcdev_xmit;
1812
1813         /* register objects with HDLC layer */
1814         if ((rc = register_hdlc_device(dev))) {
1815                 printk(KERN_WARNING "%s:unable to register hdlc device\n",__FILE__);
1816                 free_netdev(dev);
1817                 return rc;
1818         }
1819
1820         info->netdev = dev;
1821         return 0;
1822 }
1823
1824 /**
1825  * called by device driver when removing device instance
1826  * do generic HDLC cleanup
1827  *
1828  * info  pointer to device instance information
1829  */
1830 static void hdlcdev_exit(struct slgt_info *info)
1831 {
1832         unregister_hdlc_device(info->netdev);
1833         free_netdev(info->netdev);
1834         info->netdev = NULL;
1835 }
1836
1837 #endif /* ifdef CONFIG_HDLC */
1838
1839 /*
1840  * get async data from rx DMA buffers
1841  */
1842 static void rx_async(struct slgt_info *info)
1843 {
1844         struct tty_struct *tty = info->port.tty;
1845         struct mgsl_icount *icount = &info->icount;
1846         unsigned int start, end;
1847         unsigned char *p;
1848         unsigned char status;
1849         struct slgt_desc *bufs = info->rbufs;
1850         int i, count;
1851         int chars = 0;
1852         int stat;
1853         unsigned char ch;
1854
1855         start = end = info->rbuf_current;
1856
1857         while(desc_complete(bufs[end])) {
1858                 count = desc_count(bufs[end]) - info->rbuf_index;
1859                 p     = bufs[end].buf + info->rbuf_index;
1860
1861                 DBGISR(("%s rx_async count=%d\n", info->device_name, count));
1862                 DBGDATA(info, p, count, "rx");
1863
1864                 for(i=0 ; i < count; i+=2, p+=2) {
1865                         ch = *p;
1866                         icount->rx++;
1867
1868                         stat = 0;
1869
1870                         if ((status = *(p+1) & (BIT1 + BIT0))) {
1871                                 if (status & BIT1)
1872                                         icount->parity++;
1873                                 else if (status & BIT0)
1874                                         icount->frame++;
1875                                 /* discard char if tty control flags say so */
1876                                 if (status & info->ignore_status_mask)
1877                                         continue;
1878                                 if (status & BIT1)
1879                                         stat = TTY_PARITY;
1880                                 else if (status & BIT0)
1881                                         stat = TTY_FRAME;
1882                         }
1883                         if (tty) {
1884                                 tty_insert_flip_char(tty, ch, stat);
1885                                 chars++;
1886                         }
1887                 }
1888
1889                 if (i < count) {
1890                         /* receive buffer not completed */
1891                         info->rbuf_index += i;
1892                         mod_timer(&info->rx_timer, jiffies + 1);
1893                         break;
1894                 }
1895
1896                 info->rbuf_index = 0;
1897                 free_rbufs(info, end, end);
1898
1899                 if (++end == info->rbuf_count)
1900                         end = 0;
1901
1902                 /* if entire list searched then no frame available */
1903                 if (end == start)
1904                         break;
1905         }
1906
1907         if (tty && chars)
1908                 tty_flip_buffer_push(tty);
1909 }
1910
1911 /*
1912  * return next bottom half action to perform
1913  */
1914 static int bh_action(struct slgt_info *info)
1915 {
1916         unsigned long flags;
1917         int rc;
1918
1919         spin_lock_irqsave(&info->lock,flags);
1920
1921         if (info->pending_bh & BH_RECEIVE) {
1922                 info->pending_bh &= ~BH_RECEIVE;
1923                 rc = BH_RECEIVE;
1924         } else if (info->pending_bh & BH_TRANSMIT) {
1925                 info->pending_bh &= ~BH_TRANSMIT;
1926                 rc = BH_TRANSMIT;
1927         } else if (info->pending_bh & BH_STATUS) {
1928                 info->pending_bh &= ~BH_STATUS;
1929                 rc = BH_STATUS;
1930         } else {
1931                 /* Mark BH routine as complete */
1932                 info->bh_running = false;
1933                 info->bh_requested = false;
1934                 rc = 0;
1935         }
1936
1937         spin_unlock_irqrestore(&info->lock,flags);
1938
1939         return rc;
1940 }
1941
1942 /*
1943  * perform bottom half processing
1944  */
1945 static void bh_handler(struct work_struct *work)
1946 {
1947         struct slgt_info *info = container_of(work, struct slgt_info, task);
1948         int action;
1949
1950         if (!info)
1951                 return;
1952         info->bh_running = true;
1953
1954         while((action = bh_action(info))) {
1955                 switch (action) {
1956                 case BH_RECEIVE:
1957                         DBGBH(("%s bh receive\n", info->device_name));
1958                         switch(info->params.mode) {
1959                         case MGSL_MODE_ASYNC:
1960                                 rx_async(info);
1961                                 break;
1962                         case MGSL_MODE_HDLC:
1963                                 while(rx_get_frame(info));
1964                                 break;
1965                         case MGSL_MODE_RAW:
1966                         case MGSL_MODE_MONOSYNC:
1967                         case MGSL_MODE_BISYNC:
1968                                 while(rx_get_buf(info));
1969                                 break;
1970                         }
1971                         /* restart receiver if rx DMA buffers exhausted */
1972                         if (info->rx_restart)
1973                                 rx_start(info);
1974                         break;
1975                 case BH_TRANSMIT:
1976                         bh_transmit(info);
1977                         break;
1978                 case BH_STATUS:
1979                         DBGBH(("%s bh status\n", info->device_name));
1980                         info->ri_chkcount = 0;
1981                         info->dsr_chkcount = 0;
1982                         info->dcd_chkcount = 0;
1983                         info->cts_chkcount = 0;
1984                         break;
1985                 default:
1986                         DBGBH(("%s unknown action\n", info->device_name));
1987                         break;
1988                 }
1989         }
1990         DBGBH(("%s bh_handler exit\n", info->device_name));
1991 }
1992
1993 static void bh_transmit(struct slgt_info *info)
1994 {
1995         struct tty_struct *tty = info->port.tty;
1996
1997         DBGBH(("%s bh_transmit\n", info->device_name));
1998         if (tty)
1999                 tty_wakeup(tty);
2000 }
2001
2002 static void dsr_change(struct slgt_info *info, unsigned short status)
2003 {
2004         if (status & BIT3) {
2005                 info->signals |= SerialSignal_DSR;
2006                 info->input_signal_events.dsr_up++;
2007         } else {
2008                 info->signals &= ~SerialSignal_DSR;
2009                 info->input_signal_events.dsr_down++;
2010         }
2011         DBGISR(("dsr_change %s signals=%04X\n", info->device_name, info->signals));
2012         if ((info->dsr_chkcount)++ == IO_PIN_SHUTDOWN_LIMIT) {
2013                 slgt_irq_off(info, IRQ_DSR);
2014                 return;
2015         }
2016         info->icount.dsr++;
2017         wake_up_interruptible(&info->status_event_wait_q);
2018         wake_up_interruptible(&info->event_wait_q);
2019         info->pending_bh |= BH_STATUS;
2020 }
2021
2022 static void cts_change(struct slgt_info *info, unsigned short status)
2023 {
2024         if (status & BIT2) {
2025                 info->signals |= SerialSignal_CTS;
2026                 info->input_signal_events.cts_up++;
2027         } else {
2028                 info->signals &= ~SerialSignal_CTS;
2029                 info->input_signal_events.cts_down++;
2030         }
2031         DBGISR(("cts_change %s signals=%04X\n", info->device_name, info->signals));
2032         if ((info->cts_chkcount)++ == IO_PIN_SHUTDOWN_LIMIT) {
2033                 slgt_irq_off(info, IRQ_CTS);
2034                 return;
2035         }
2036         info->icount.cts++;
2037         wake_up_interruptible(&info->status_event_wait_q);
2038         wake_up_interruptible(&info->event_wait_q);
2039         info->pending_bh |= BH_STATUS;
2040
2041         if (info->port.flags & ASYNC_CTS_FLOW) {
2042                 if (info->port.tty) {
2043                         if (info->port.tty->hw_stopped) {
2044                                 if (info->signals & SerialSignal_CTS) {
2045                                         info->port.tty->hw_stopped = 0;
2046                                         info->pending_bh |= BH_TRANSMIT;
2047                                         return;
2048                                 }
2049                         } else {
2050                                 if (!(info->signals & SerialSignal_CTS))
2051                                         info->port.tty->hw_stopped = 1;
2052                         }
2053                 }
2054         }
2055 }
2056
2057 static void dcd_change(struct slgt_info *info, unsigned short status)
2058 {
2059         if (status & BIT1) {
2060                 info->signals |= SerialSignal_DCD;
2061                 info->input_signal_events.dcd_up++;
2062         } else {
2063                 info->signals &= ~SerialSignal_DCD;
2064                 info->input_signal_events.dcd_down++;
2065         }
2066         DBGISR(("dcd_change %s signals=%04X\n", info->device_name, info->signals));
2067         if ((info->dcd_chkcount)++ == IO_PIN_SHUTDOWN_LIMIT) {
2068                 slgt_irq_off(info, IRQ_DCD);
2069                 return;
2070         }
2071         info->icount.dcd++;
2072 #if SYNCLINK_GENERIC_HDLC
2073         if (info->netcount) {
2074                 if (info->signals & SerialSignal_DCD)
2075                         netif_carrier_on(info->netdev);
2076                 else
2077                         netif_carrier_off(info->netdev);
2078         }
2079 #endif
2080         wake_up_interruptible(&info->status_event_wait_q);
2081         wake_up_interruptible(&info->event_wait_q);
2082         info->pending_bh |= BH_STATUS;
2083
2084         if (info->port.flags & ASYNC_CHECK_CD) {
2085                 if (info->signals & SerialSignal_DCD)
2086                         wake_up_interruptible(&info->port.open_wait);
2087                 else {
2088                         if (info->port.tty)
2089                                 tty_hangup(info->port.tty);
2090                 }
2091         }
2092 }
2093
2094 static void ri_change(struct slgt_info *info, unsigned short status)
2095 {
2096         if (status & BIT0) {
2097                 info->signals |= SerialSignal_RI;
2098                 info->input_signal_events.ri_up++;
2099         } else {
2100                 info->signals &= ~SerialSignal_RI;
2101                 info->input_signal_events.ri_down++;
2102         }
2103         DBGISR(("ri_change %s signals=%04X\n", info->device_name, info->signals));
2104         if ((info->ri_chkcount)++ == IO_PIN_SHUTDOWN_LIMIT) {
2105                 slgt_irq_off(info, IRQ_RI);
2106                 return;
2107         }
2108         info->icount.rng++;
2109         wake_up_interruptible(&info->status_event_wait_q);
2110         wake_up_interruptible(&info->event_wait_q);
2111         info->pending_bh |= BH_STATUS;
2112 }
2113
2114 static void isr_serial(struct slgt_info *info)
2115 {
2116         unsigned short status = rd_reg16(info, SSR);
2117
2118         DBGISR(("%s isr_serial status=%04X\n", info->device_name, status));
2119
2120         wr_reg16(info, SSR, status); /* clear pending */
2121
2122         info->irq_occurred = true;
2123
2124         if (info->params.mode == MGSL_MODE_ASYNC) {
2125                 if (status & IRQ_TXIDLE) {
2126                         if (info->tx_count)
2127                                 isr_txeom(info, status);
2128                 }
2129                 if ((status & IRQ_RXBREAK) && (status & RXBREAK)) {
2130                         info->icount.brk++;
2131                         /* process break detection if tty control allows */
2132                         if (info->port.tty) {
2133                                 if (!(status & info->ignore_status_mask)) {
2134                                         if (info->read_status_mask & MASK_BREAK) {
2135                                                 tty_insert_flip_char(info->port.tty, 0, TTY_BREAK);
2136                                                 if (info->port.flags & ASYNC_SAK)
2137                                                         do_SAK(info->port.tty);
2138                                         }
2139                                 }
2140                         }
2141                 }
2142         } else {
2143                 if (status & (IRQ_TXIDLE + IRQ_TXUNDER))
2144                         isr_txeom(info, status);
2145
2146                 if (status & IRQ_RXIDLE) {
2147                         if (status & RXIDLE)
2148                                 info->icount.rxidle++;
2149                         else
2150                                 info->icount.exithunt++;
2151                         wake_up_interruptible(&info->event_wait_q);
2152                 }
2153
2154                 if (status & IRQ_RXOVER)
2155                         rx_start(info);
2156         }
2157
2158         if (status & IRQ_DSR)
2159                 dsr_change(info, status);
2160         if (status & IRQ_CTS)
2161                 cts_change(info, status);
2162         if (status & IRQ_DCD)
2163                 dcd_change(info, status);
2164         if (status & IRQ_RI)
2165                 ri_change(info, status);
2166 }
2167
2168 static void isr_rdma(struct slgt_info *info)
2169 {
2170         unsigned int status = rd_reg32(info, RDCSR);
2171
2172         DBGISR(("%s isr_rdma status=%08x\n", info->device_name, status));
2173
2174         /* RDCSR (rx DMA control/status)
2175          *
2176          * 31..07  reserved
2177          * 06      save status byte to DMA buffer
2178          * 05      error
2179          * 04      eol (end of list)
2180          * 03      eob (end of buffer)
2181          * 02      IRQ enable
2182          * 01      reset
2183          * 00      enable
2184          */
2185         wr_reg32(info, RDCSR, status);  /* clear pending */
2186
2187         if (status & (BIT5 + BIT4)) {
2188                 DBGISR(("%s isr_rdma rx_restart=1\n", info->device_name));
2189                 info->rx_restart = true;
2190         }
2191         info->pending_bh |= BH_RECEIVE;
2192 }
2193
2194 static void isr_tdma(struct slgt_info *info)
2195 {
2196         unsigned int status = rd_reg32(info, TDCSR);
2197
2198         DBGISR(("%s isr_tdma status=%08x\n", info->device_name, status));
2199
2200         /* TDCSR (tx DMA control/status)
2201          *
2202          * 31..06  reserved
2203          * 05      error
2204          * 04      eol (end of list)
2205          * 03      eob (end of buffer)
2206          * 02      IRQ enable
2207          * 01      reset
2208          * 00      enable
2209          */
2210         wr_reg32(info, TDCSR, status);  /* clear pending */
2211
2212         if (status & (BIT5 + BIT4 + BIT3)) {
2213                 // another transmit buffer has completed
2214                 // run bottom half to get more send data from user
2215                 info->pending_bh |= BH_TRANSMIT;
2216         }
2217 }
2218
2219 static void isr_txeom(struct slgt_info *info, unsigned short status)
2220 {
2221         DBGISR(("%s txeom status=%04x\n", info->device_name, status));
2222
2223         slgt_irq_off(info, IRQ_TXDATA + IRQ_TXIDLE + IRQ_TXUNDER);
2224         tdma_reset(info);
2225         reset_tbufs(info);
2226         if (status & IRQ_TXUNDER) {
2227                 unsigned short val = rd_reg16(info, TCR);
2228                 wr_reg16(info, TCR, (unsigned short)(val | BIT2)); /* set reset bit */
2229                 wr_reg16(info, TCR, val); /* clear reset bit */
2230         }
2231
2232         if (info->tx_active) {
2233                 if (info->params.mode != MGSL_MODE_ASYNC) {
2234                         if (status & IRQ_TXUNDER)
2235                                 info->icount.txunder++;
2236                         else if (status & IRQ_TXIDLE)
2237                                 info->icount.txok++;
2238                 }
2239
2240                 info->tx_active = false;
2241                 info->tx_count = 0;
2242
2243                 del_timer(&info->tx_timer);
2244
2245                 if (info->params.mode != MGSL_MODE_ASYNC && info->drop_rts_on_tx_done) {
2246                         info->signals &= ~SerialSignal_RTS;
2247                         info->drop_rts_on_tx_done = false;
2248                         set_signals(info);
2249                 }
2250
2251 #if SYNCLINK_GENERIC_HDLC
2252                 if (info->netcount)
2253                         hdlcdev_tx_done(info);
2254                 else
2255 #endif
2256                 {
2257                         if (info->port.tty && (info->port.tty->stopped || info->port.tty->hw_stopped)) {
2258                                 tx_stop(info);
2259                                 return;
2260                         }
2261                         info->pending_bh |= BH_TRANSMIT;
2262                 }
2263         }
2264 }
2265
2266 static void isr_gpio(struct slgt_info *info, unsigned int changed, unsigned int state)
2267 {
2268         struct cond_wait *w, *prev;
2269
2270         /* wake processes waiting for specific transitions */
2271         for (w = info->gpio_wait_q, prev = NULL ; w != NULL ; w = w->next) {
2272                 if (w->data & changed) {
2273                         w->data = state;
2274                         wake_up_interruptible(&w->q);
2275                         if (prev != NULL)
2276                                 prev->next = w->next;
2277                         else
2278                                 info->gpio_wait_q = w->next;
2279                 } else
2280                         prev = w;
2281         }
2282 }
2283
2284 /* interrupt service routine
2285  *
2286  *      irq     interrupt number
2287  *      dev_id  device ID supplied during interrupt registration
2288  */
2289 static irqreturn_t slgt_interrupt(int dummy, void *dev_id)
2290 {
2291         struct slgt_info *info = dev_id;
2292         unsigned int gsr;
2293         unsigned int i;
2294
2295         DBGISR(("slgt_interrupt irq=%d entry\n", info->irq_level));
2296
2297         spin_lock(&info->lock);
2298
2299         while((gsr = rd_reg32(info, GSR) & 0xffffff00)) {
2300                 DBGISR(("%s gsr=%08x\n", info->device_name, gsr));
2301                 info->irq_occurred = true;
2302                 for(i=0; i < info->port_count ; i++) {
2303                         if (info->port_array[i] == NULL)
2304                                 continue;
2305                         if (gsr & (BIT8 << i))
2306                                 isr_serial(info->port_array[i]);
2307                         if (gsr & (BIT16 << (i*2)))
2308                                 isr_rdma(info->port_array[i]);
2309                         if (gsr & (BIT17 << (i*2)))
2310                                 isr_tdma(info->port_array[i]);
2311                 }
2312         }
2313
2314         if (info->gpio_present) {
2315                 unsigned int state;
2316                 unsigned int changed;
2317                 while ((changed = rd_reg32(info, IOSR)) != 0) {
2318                         DBGISR(("%s iosr=%08x\n", info->device_name, changed));
2319                         /* read latched state of GPIO signals */
2320                         state = rd_reg32(info, IOVR);
2321                         /* clear pending GPIO interrupt bits */
2322                         wr_reg32(info, IOSR, changed);
2323                         for (i=0 ; i < info->port_count ; i++) {
2324                                 if (info->port_array[i] != NULL)
2325                                         isr_gpio(info->port_array[i], changed, state);
2326                         }
2327                 }
2328         }
2329
2330         for(i=0; i < info->port_count ; i++) {
2331                 struct slgt_info *port = info->port_array[i];
2332
2333                 if (port && (port->port.count || port->netcount) &&
2334                     port->pending_bh && !port->bh_running &&
2335                     !port->bh_requested) {
2336                         DBGISR(("%s bh queued\n", port->device_name));
2337                         schedule_work(&port->task);
2338                         port->bh_requested = true;
2339                 }
2340         }
2341
2342         spin_unlock(&info->lock);
2343
2344         DBGISR(("slgt_interrupt irq=%d exit\n", info->irq_level));
2345         return IRQ_HANDLED;
2346 }
2347
2348 static int startup(struct slgt_info *info)
2349 {
2350         DBGINFO(("%s startup\n", info->device_name));
2351
2352         if (info->port.flags & ASYNC_INITIALIZED)
2353                 return 0;
2354
2355         if (!info->tx_buf) {
2356                 info->tx_buf = kmalloc(info->max_frame_size, GFP_KERNEL);
2357                 if (!info->tx_buf) {
2358                         DBGERR(("%s can't allocate tx buffer\n", info->device_name));
2359                         return -ENOMEM;
2360                 }
2361         }
2362
2363         info->pending_bh = 0;
2364
2365         memset(&info->icount, 0, sizeof(info->icount));
2366
2367         /* program hardware for current parameters */
2368         change_params(info);
2369
2370         if (info->port.tty)
2371                 clear_bit(TTY_IO_ERROR, &info->port.tty->flags);
2372
2373         info->port.flags |= ASYNC_INITIALIZED;
2374
2375         return 0;
2376 }
2377
2378 /*
2379  *  called by close() and hangup() to shutdown hardware
2380  */
2381 static void shutdown(struct slgt_info *info)
2382 {
2383         unsigned long flags;
2384
2385         if (!(info->port.flags & ASYNC_INITIALIZED))
2386                 return;
2387
2388         DBGINFO(("%s shutdown\n", info->device_name));
2389
2390         /* clear status wait queue because status changes */
2391         /* can't happen after shutting down the hardware */
2392         wake_up_interruptible(&info->status_event_wait_q);
2393         wake_up_interruptible(&info->event_wait_q);
2394
2395         del_timer_sync(&info->tx_timer);
2396         del_timer_sync(&info->rx_timer);
2397
2398         kfree(info->tx_buf);
2399         info->tx_buf = NULL;
2400
2401         spin_lock_irqsave(&info->lock,flags);
2402
2403         tx_stop(info);
2404         rx_stop(info);
2405
2406         slgt_irq_off(info, IRQ_ALL | IRQ_MASTER);
2407
2408         if (!info->port.tty || info->port.tty->termios->c_cflag & HUPCL) {
2409                 info->signals &= ~(SerialSignal_DTR + SerialSignal_RTS);
2410                 set_signals(info);
2411         }
2412
2413         flush_cond_wait(&info->gpio_wait_q);
2414
2415         spin_unlock_irqrestore(&info->lock,flags);
2416
2417         if (info->port.tty)
2418                 set_bit(TTY_IO_ERROR, &info->port.tty->flags);
2419
2420         info->port.flags &= ~ASYNC_INITIALIZED;
2421 }
2422
2423 static void program_hw(struct slgt_info *info)
2424 {
2425         unsigned long flags;
2426
2427         spin_lock_irqsave(&info->lock,flags);
2428
2429         rx_stop(info);
2430         tx_stop(info);
2431
2432         if (info->params.mode != MGSL_MODE_ASYNC ||
2433             info->netcount)
2434                 sync_mode(info);
2435         else
2436                 async_mode(info);
2437
2438         set_signals(info);
2439
2440         info->dcd_chkcount = 0;
2441         info->cts_chkcount = 0;
2442         info->ri_chkcount = 0;
2443         info->dsr_chkcount = 0;
2444
2445         slgt_irq_on(info, IRQ_DCD | IRQ_CTS | IRQ_DSR | IRQ_RI);
2446         get_signals(info);
2447
2448         if (info->netcount ||
2449             (info->port.tty && info->port.tty->termios->c_cflag & CREAD))
2450                 rx_start(info);
2451
2452         spin_unlock_irqrestore(&info->lock,flags);
2453 }
2454
2455 /*
2456  * reconfigure adapter based on new parameters
2457  */
2458 static void change_params(struct slgt_info *info)
2459 {
2460         unsigned cflag;
2461         int bits_per_char;
2462
2463         if (!info->port.tty || !info->port.tty->termios)
2464                 return;
2465         DBGINFO(("%s change_params\n", info->device_name));
2466
2467         cflag = info->port.tty->termios->c_cflag;
2468
2469         /* if B0 rate (hangup) specified then negate DTR and RTS */
2470         /* otherwise assert DTR and RTS */
2471         if (cflag & CBAUD)
2472                 info->signals |= SerialSignal_RTS + SerialSignal_DTR;
2473         else
2474                 info->signals &= ~(SerialSignal_RTS + SerialSignal_DTR);
2475
2476         /* byte size and parity */
2477
2478         switch (cflag & CSIZE) {
2479         case CS5: info->params.data_bits = 5; break;
2480         case CS6: info->params.data_bits = 6; break;
2481         case CS7: info->params.data_bits = 7; break;
2482         case CS8: info->params.data_bits = 8; break;
2483         default:  info->params.data_bits = 7; break;
2484         }
2485
2486         info->params.stop_bits = (cflag & CSTOPB) ? 2 : 1;
2487
2488         if (cflag & PARENB)
2489                 info->params.parity = (cflag & PARODD) ? ASYNC_PARITY_ODD : ASYNC_PARITY_EVEN;
2490         else
2491                 info->params.parity = ASYNC_PARITY_NONE;
2492
2493         /* calculate number of jiffies to transmit a full
2494          * FIFO (32 bytes) at specified data rate
2495          */
2496         bits_per_char = info->params.data_bits +
2497                         info->params.stop_bits + 1;
2498
2499         info->params.data_rate = tty_get_baud_rate(info->port.tty);
2500
2501         if (info->params.data_rate) {
2502                 info->timeout = (32*HZ*bits_per_char) /
2503                                 info->params.data_rate;
2504         }
2505         info->timeout += HZ/50;         /* Add .02 seconds of slop */
2506
2507         if (cflag & CRTSCTS)
2508                 info->port.flags |= ASYNC_CTS_FLOW;
2509         else
2510                 info->port.flags &= ~ASYNC_CTS_FLOW;
2511
2512         if (cflag & CLOCAL)
2513                 info->port.flags &= ~ASYNC_CHECK_CD;
2514         else
2515                 info->port.flags |= ASYNC_CHECK_CD;
2516
2517         /* process tty input control flags */
2518
2519         info->read_status_mask = IRQ_RXOVER;
2520         if (I_INPCK(info->port.tty))
2521                 info->read_status_mask |= MASK_PARITY | MASK_FRAMING;
2522         if (I_BRKINT(info->port.tty) || I_PARMRK(info->port.tty))
2523                 info->read_status_mask |= MASK_BREAK;
2524         if (I_IGNPAR(info->port.tty))
2525                 info->ignore_status_mask |= MASK_PARITY | MASK_FRAMING;
2526         if (I_IGNBRK(info->port.tty)) {
2527                 info->ignore_status_mask |= MASK_BREAK;
2528                 /* If ignoring parity and break indicators, ignore
2529                  * overruns too.  (For real raw support).
2530                  */
2531                 if (I_IGNPAR(info->port.tty))
2532                         info->ignore_status_mask |= MASK_OVERRUN;
2533         }
2534
2535         program_hw(info);
2536 }
2537
2538 static int get_stats(struct slgt_info *info, struct mgsl_icount __user *user_icount)
2539 {
2540         DBGINFO(("%s get_stats\n",  info->device_name));
2541         if (!user_icount) {
2542                 memset(&info->icount, 0, sizeof(info->icount));
2543         } else {
2544                 if (copy_to_user(user_icount, &info->icount, sizeof(struct mgsl_icount)))
2545                         return -EFAULT;
2546         }
2547         return 0;
2548 }
2549
2550 static int get_params(struct slgt_info *info, MGSL_PARAMS __user *user_params)
2551 {
2552         DBGINFO(("%s get_params\n", info->device_name));
2553         if (copy_to_user(user_params, &info->params, sizeof(MGSL_PARAMS)))
2554                 return -EFAULT;
2555         return 0;
2556 }
2557
2558 static int set_params(struct slgt_info *info, MGSL_PARAMS __user *new_params)
2559 {
2560         unsigned long flags;
2561         MGSL_PARAMS tmp_params;
2562
2563         DBGINFO(("%s set_params\n", info->device_name));
2564         if (copy_from_user(&tmp_params, new_params, sizeof(MGSL_PARAMS)))
2565                 return -EFAULT;
2566
2567         spin_lock_irqsave(&info->lock, flags);
2568         memcpy(&info->params, &tmp_params, sizeof(MGSL_PARAMS));
2569         spin_unlock_irqrestore(&info->lock, flags);
2570
2571         change_params(info);
2572
2573         return 0;
2574 }
2575
2576 static int get_txidle(struct slgt_info *info, int __user *idle_mode)
2577 {
2578         DBGINFO(("%s get_txidle=%d\n", info->device_name, info->idle_mode));
2579         if (put_user(info->idle_mode, idle_mode))
2580                 return -EFAULT;
2581         return 0;
2582 }
2583
2584 static int set_txidle(struct slgt_info *info, int idle_mode)
2585 {
2586         unsigned long flags;
2587         DBGINFO(("%s set_txidle(%d)\n", info->device_name, idle_mode));
2588         spin_lock_irqsave(&info->lock,flags);
2589         info->idle_mode = idle_mode;
2590         if (info->params.mode != MGSL_MODE_ASYNC)
2591                 tx_set_idle(info);
2592         spin_unlock_irqrestore(&info->lock,flags);
2593         return 0;
2594 }
2595
2596 static int tx_enable(struct slgt_info *info, int enable)
2597 {
2598         unsigned long flags;
2599         DBGINFO(("%s tx_enable(%d)\n", info->device_name, enable));
2600         spin_lock_irqsave(&info->lock,flags);
2601         if (enable) {
2602                 if (!info->tx_enabled)
2603                         tx_start(info);
2604         } else {
2605                 if (info->tx_enabled)
2606                         tx_stop(info);
2607         }
2608         spin_unlock_irqrestore(&info->lock,flags);
2609         return 0;
2610 }
2611
2612 /*
2613  * abort transmit HDLC frame
2614  */
2615 static int tx_abort(struct slgt_info *info)
2616 {
2617         unsigned long flags;
2618         DBGINFO(("%s tx_abort\n", info->device_name));
2619         spin_lock_irqsave(&info->lock,flags);
2620         tdma_reset(info);
2621         spin_unlock_irqrestore(&info->lock,flags);
2622         return 0;
2623 }
2624
2625 static int rx_enable(struct slgt_info *info, int enable)
2626 {
2627         unsigned long flags;
2628         unsigned int rbuf_fill_level;
2629         DBGINFO(("%s rx_enable(%08x)\n", info->device_name, enable));
2630         spin_lock_irqsave(&info->lock,flags);
2631         /*
2632          * enable[31..16] = receive DMA buffer fill level
2633          * 0 = noop (leave fill level unchanged)
2634          * fill level must be multiple of 4 and <= buffer size
2635          */
2636         rbuf_fill_level = ((unsigned int)enable) >> 16;
2637         if (rbuf_fill_level) {
2638                 if ((rbuf_fill_level > DMABUFSIZE) || (rbuf_fill_level % 4)) {
2639                         spin_unlock_irqrestore(&info->lock, flags);
2640                         return -EINVAL;
2641                 }
2642                 info->rbuf_fill_level = rbuf_fill_level;
2643                 rx_stop(info); /* restart receiver to use new fill level */
2644         }
2645
2646         /*
2647          * enable[1..0] = receiver enable command
2648          * 0 = disable
2649          * 1 = enable
2650          * 2 = enable or force hunt mode if already enabled
2651          */
2652         enable &= 3;
2653         if (enable) {
2654                 if (!info->rx_enabled)
2655                         rx_start(info);
2656                 else if (enable == 2) {
2657                         /* force hunt mode (write 1 to RCR[3]) */
2658                         wr_reg16(info, RCR, rd_reg16(info, RCR) | BIT3);
2659                 }
2660         } else {
2661                 if (info->rx_enabled)
2662                         rx_stop(info);
2663         }
2664         spin_unlock_irqrestore(&info->lock,flags);
2665         return 0;
2666 }
2667
2668 /*
2669  *  wait for specified event to occur
2670  */
2671 static int wait_mgsl_event(struct slgt_info *info, int __user *mask_ptr)
2672 {
2673         unsigned long flags;
2674         int s;
2675         int rc=0;
2676         struct mgsl_icount cprev, cnow;
2677         int events;
2678         int mask;
2679         struct  _input_signal_events oldsigs, newsigs;
2680         DECLARE_WAITQUEUE(wait, current);
2681
2682         if (get_user(mask, mask_ptr))
2683                 return -EFAULT;
2684
2685         DBGINFO(("%s wait_mgsl_event(%d)\n", info->device_name, mask));
2686
2687         spin_lock_irqsave(&info->lock,flags);
2688
2689         /* return immediately if state matches requested events */
2690         get_signals(info);
2691         s = info->signals;
2692
2693         events = mask &
2694                 ( ((s & SerialSignal_DSR) ? MgslEvent_DsrActive:MgslEvent_DsrInactive) +
2695                   ((s & SerialSignal_DCD) ? MgslEvent_DcdActive:MgslEvent_DcdInactive) +
2696                   ((s & SerialSignal_CTS) ? MgslEvent_CtsActive:MgslEvent_CtsInactive) +
2697                   ((s & SerialSignal_RI)  ? MgslEvent_RiActive :MgslEvent_RiInactive) );
2698         if (events) {
2699                 spin_unlock_irqrestore(&info->lock,flags);
2700                 goto exit;
2701         }
2702
2703         /* save current irq counts */
2704         cprev = info->icount;
2705         oldsigs = info->input_signal_events;
2706
2707         /* enable hunt and idle irqs if needed */
2708         if (mask & (MgslEvent_ExitHuntMode+MgslEvent_IdleReceived)) {
2709                 unsigned short val = rd_reg16(info, SCR);
2710                 if (!(val & IRQ_RXIDLE))
2711                         wr_reg16(info, SCR, (unsigned short)(val | IRQ_RXIDLE));
2712         }
2713
2714         set_current_state(TASK_INTERRUPTIBLE);
2715         add_wait_queue(&info->event_wait_q, &wait);
2716
2717         spin_unlock_irqrestore(&info->lock,flags);
2718
2719         for(;;) {
2720                 schedule();
2721                 if (signal_pending(current)) {
2722                         rc = -ERESTARTSYS;
2723                         break;
2724                 }
2725
2726                 /* get current irq counts */
2727                 spin_lock_irqsave(&info->lock,flags);
2728                 cnow = info->icount;
2729                 newsigs = info->input_signal_events;
2730                 set_current_state(TASK_INTERRUPTIBLE);
2731                 spin_unlock_irqrestore(&info->lock,flags);
2732
2733                 /* if no change, wait aborted for some reason */
2734                 if (newsigs.dsr_up   == oldsigs.dsr_up   &&
2735                     newsigs.dsr_down == oldsigs.dsr_down &&
2736                     newsigs.dcd_up   == oldsigs.dcd_up   &&
2737                     newsigs.dcd_down == oldsigs.dcd_down &&
2738                     newsigs.cts_up   == oldsigs.cts_up   &&
2739                     newsigs.cts_down == oldsigs.cts_down &&
2740                     newsigs.ri_up    == oldsigs.ri_up    &&
2741                     newsigs.ri_down  == oldsigs.ri_down  &&
2742                     cnow.exithunt    == cprev.exithunt   &&
2743                     cnow.rxidle      == cprev.rxidle) {
2744                         rc = -EIO;
2745                         break;
2746                 }
2747
2748                 events = mask &
2749                         ( (newsigs.dsr_up   != oldsigs.dsr_up   ? MgslEvent_DsrActive:0)   +
2750                           (newsigs.dsr_down != oldsigs.dsr_down ? MgslEvent_DsrInactive:0) +
2751                           (newsigs.dcd_up   != oldsigs.dcd_up   ? MgslEvent_DcdActive:0)   +
2752                           (newsigs.dcd_down != oldsigs.dcd_down ? MgslEvent_DcdInactive:0) +
2753                           (newsigs.cts_up   != oldsigs.cts_up   ? MgslEvent_CtsActive:0)   +
2754                           (newsigs.cts_down != oldsigs.cts_down ? MgslEvent_CtsInactive:0) +
2755                           (newsigs.ri_up    != oldsigs.ri_up    ? MgslEvent_RiActive:0)    +
2756                           (newsigs.ri_down  != oldsigs.ri_down  ? MgslEvent_RiInactive:0)  +
2757                           (cnow.exithunt    != cprev.exithunt   ? MgslEvent_ExitHuntMode:0) +
2758                           (cnow.rxidle      != cprev.rxidle     ? MgslEvent_IdleReceived:0) );
2759                 if (events)
2760                         break;
2761
2762                 cprev = cnow;
2763                 oldsigs = newsigs;
2764         }
2765
2766         remove_wait_queue(&info->event_wait_q, &wait);
2767         set_current_state(TASK_RUNNING);
2768
2769
2770         if (mask & (MgslEvent_ExitHuntMode + MgslEvent_IdleReceived)) {
2771                 spin_lock_irqsave(&info->lock,flags);
2772                 if (!waitqueue_active(&info->event_wait_q)) {
2773                         /* disable enable exit hunt mode/idle rcvd IRQs */
2774                         wr_reg16(info, SCR,
2775                                 (unsigned short)(rd_reg16(info, SCR) & ~IRQ_RXIDLE));
2776                 }
2777                 spin_unlock_irqrestore(&info->lock,flags);
2778         }
2779 exit:
2780         if (rc == 0)
2781                 rc = put_user(events, mask_ptr);
2782         return rc;
2783 }
2784
2785 static int get_interface(struct slgt_info *info, int __user *if_mode)
2786 {
2787         DBGINFO(("%s get_interface=%x\n", info->device_name, info->if_mode));
2788         if (put_user(info->if_mode, if_mode))
2789                 return -EFAULT;
2790         return 0;
2791 }
2792
2793 static int set_interface(struct slgt_info *info, int if_mode)
2794 {
2795         unsigned long flags;
2796         unsigned short val;
2797
2798         DBGINFO(("%s set_interface=%x)\n", info->device_name, if_mode));
2799         spin_lock_irqsave(&info->lock,flags);
2800         info->if_mode = if_mode;
2801
2802         msc_set_vcr(info);
2803
2804         /* TCR (tx control) 07  1=RTS driver control */
2805         val = rd_reg16(info, TCR);
2806         if (info->if_mode & MGSL_INTERFACE_RTS_EN)
2807                 val |= BIT7;
2808         else
2809                 val &= ~BIT7;
2810         wr_reg16(info, TCR, val);
2811
2812         spin_unlock_irqrestore(&info->lock,flags);
2813         return 0;
2814 }
2815
2816 /*
2817  * set general purpose IO pin state and direction
2818  *
2819  * user_gpio fields:
2820  * state   each bit indicates a pin state
2821  * smask   set bit indicates pin state to set
2822  * dir     each bit indicates a pin direction (0=input, 1=output)
2823  * dmask   set bit indicates pin direction to set
2824  */
2825 static int set_gpio(struct slgt_info *info, struct gpio_desc __user *user_gpio)
2826 {
2827         unsigned long flags;
2828         struct gpio_desc gpio;
2829         __u32 data;
2830
2831         if (!info->gpio_present)
2832                 return -EINVAL;
2833         if (copy_from_user(&gpio, user_gpio, sizeof(gpio)))
2834                 return -EFAULT;
2835         DBGINFO(("%s set_gpio state=%08x smask=%08x dir=%08x dmask=%08x\n",
2836                  info->device_name, gpio.state, gpio.smask,
2837                  gpio.dir, gpio.dmask));
2838
2839         spin_lock_irqsave(&info->lock,flags);
2840         if (gpio.dmask) {
2841                 data = rd_reg32(info, IODR);
2842                 data |= gpio.dmask & gpio.dir;
2843                 data &= ~(gpio.dmask & ~gpio.dir);
2844                 wr_reg32(info, IODR, data);
2845         }
2846         if (gpio.smask) {
2847                 data = rd_reg32(info, IOVR);
2848                 data |= gpio.smask & gpio.state;
2849                 data &= ~(gpio.smask & ~gpio.state);
2850                 wr_reg32(info, IOVR, data);
2851         }
2852         spin_unlock_irqrestore(&info->lock,flags);
2853
2854         return 0;
2855 }
2856
2857 /*
2858  * get general purpose IO pin state and direction
2859  */
2860 static int get_gpio(struct slgt_info *info, struct gpio_desc __user *user_gpio)
2861 {
2862         struct gpio_desc gpio;
2863         if (!info->gpio_present)
2864                 return -EINVAL;
2865         gpio.state = rd_reg32(info, IOVR);
2866         gpio.smask = 0xffffffff;
2867         gpio.dir   = rd_reg32(info, IODR);
2868         gpio.dmask = 0xffffffff;
2869         if (copy_to_user(user_gpio, &gpio, sizeof(gpio)))
2870                 return -EFAULT;
2871         DBGINFO(("%s get_gpio state=%08x dir=%08x\n",
2872                  info->device_name, gpio.state, gpio.dir));
2873         return 0;
2874 }
2875
2876 /*
2877  * conditional wait facility
2878  */
2879 static void init_cond_wait(struct cond_wait *w, unsigned int data)
2880 {
2881         init_waitqueue_head(&w->q);
2882         init_waitqueue_entry(&w->wait, current);
2883         w->data = data;
2884 }
2885
2886 static void add_cond_wait(struct cond_wait **head, struct cond_wait *w)
2887 {
2888         set_current_state(TASK_INTERRUPTIBLE);
2889         add_wait_queue(&w->q, &w->wait);
2890         w->next = *head;
2891         *head = w;
2892 }
2893
2894 static void remove_cond_wait(struct cond_wait **head, struct cond_wait *cw)
2895 {
2896         struct cond_wait *w, *prev;
2897         remove_wait_queue(&cw->q, &cw->wait);
2898         set_current_state(TASK_RUNNING);
2899         for (w = *head, prev = NULL ; w != NULL ; prev = w, w = w->next) {
2900                 if (w == cw) {
2901                         if (prev != NULL)
2902                                 prev->next = w->next;
2903                         else
2904                                 *head = w->next;
2905                         break;
2906                 }
2907         }
2908 }
2909
2910 static void flush_cond_wait(struct cond_wait **head)
2911 {
2912         while (*head != NULL) {
2913                 wake_up_interruptible(&(*head)->q);
2914                 *head = (*head)->next;
2915         }
2916 }
2917
2918 /*
2919  * wait for general purpose I/O pin(s) to enter specified state
2920  *
2921  * user_gpio fields:
2922  * state - bit indicates target pin state
2923  * smask - set bit indicates watched pin
2924  *
2925  * The wait ends when at least one watched pin enters the specified
2926  * state. When 0 (no error) is returned, user_gpio->state is set to the
2927  * state of all GPIO pins when the wait ends.
2928  *
2929  * Note: Each pin may be a dedicated input, dedicated output, or
2930  * configurable input/output. The number and configuration of pins
2931  * varies with the specific adapter model. Only input pins (dedicated
2932  * or configured) can be monitored with this function.
2933  */
2934 static int wait_gpio(struct slgt_info *info, struct gpio_desc __user *user_gpio)
2935 {
2936         unsigned long flags;
2937         int rc = 0;
2938         struct gpio_desc gpio;
2939         struct cond_wait wait;
2940         u32 state;
2941
2942         if (!info->gpio_present)
2943                 return -EINVAL;
2944         if (copy_from_user(&gpio, user_gpio, sizeof(gpio)))
2945                 return -EFAULT;
2946         DBGINFO(("%s wait_gpio() state=%08x smask=%08x\n",
2947                  info->device_name, gpio.state, gpio.smask));
2948         /* ignore output pins identified by set IODR bit */
2949         if ((gpio.smask &= ~rd_reg32(info, IODR)) == 0)
2950                 return -EINVAL;
2951         init_cond_wait(&wait, gpio.smask);
2952
2953         spin_lock_irqsave(&info->lock, flags);
2954         /* enable interrupts for watched pins */
2955         wr_reg32(info, IOER, rd_reg32(info, IOER) | gpio.smask);
2956         /* get current pin states */
2957         state = rd_reg32(info, IOVR);
2958
2959         if (gpio.smask & ~(state ^ gpio.state)) {
2960                 /* already in target state */
2961                 gpio.state = state;
2962         } else {
2963                 /* wait for target state */
2964                 add_cond_wait(&info->gpio_wait_q, &wait);
2965                 spin_unlock_irqrestore(&info->lock, flags);
2966                 schedule();
2967                 if (signal_pending(current))
2968                         rc = -ERESTARTSYS;
2969                 else
2970                         gpio.state = wait.data;
2971                 spin_lock_irqsave(&info->lock, flags);
2972                 remove_cond_wait(&info->gpio_wait_q, &wait);
2973         }
2974
2975         /* disable all GPIO interrupts if no waiting processes */
2976         if (info->gpio_wait_q == NULL)
2977                 wr_reg32(info, IOER, 0);
2978         spin_unlock_irqrestore(&info->lock,flags);
2979
2980         if ((rc == 0) && copy_to_user(user_gpio, &gpio, sizeof(gpio)))
2981                 rc = -EFAULT;
2982         return rc;
2983 }
2984
2985 static int modem_input_wait(struct slgt_info *info,int arg)
2986 {
2987         unsigned long flags;
2988         int rc;
2989         struct mgsl_icount cprev, cnow;
2990         DECLARE_WAITQUEUE(wait, current);
2991
2992         /* save current irq counts */
2993         spin_lock_irqsave(&info->lock,flags);
2994         cprev = info->icount;
2995         add_wait_queue(&info->status_event_wait_q, &wait);
2996         set_current_state(TASK_INTERRUPTIBLE);
2997         spin_unlock_irqrestore(&info->lock,flags);
2998
2999         for(;;) {
3000                 schedule();
3001                 if (signal_pending(current)) {
3002                         rc = -ERESTARTSYS;
3003                         break;
3004                 }
3005
3006                 /* get new irq counts */
3007                 spin_lock_irqsave(&info->lock,flags);
3008                 cnow = info->icount;
3009                 set_current_state(TASK_INTERRUPTIBLE);
3010                 spin_unlock_irqrestore(&info->lock,flags);
3011
3012                 /* if no change, wait aborted for some reason */
3013                 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
3014                     cnow.dcd == cprev.dcd && cnow.cts == cprev.cts) {
3015                         rc = -EIO;
3016                         break;
3017                 }
3018
3019                 /* check for change in caller specified modem input */
3020                 if ((arg & TIOCM_RNG && cnow.rng != cprev.rng) ||
3021                     (arg & TIOCM_DSR && cnow.dsr != cprev.dsr) ||
3022                     (arg & TIOCM_CD  && cnow.dcd != cprev.dcd) ||
3023                     (arg & TIOCM_CTS && cnow.cts != cprev.cts)) {
3024                         rc = 0;
3025                         break;
3026                 }
3027
3028                 cprev = cnow;
3029         }
3030         remove_wait_queue(&info->status_event_wait_q, &wait);
3031         set_current_state(TASK_RUNNING);
3032         return rc;
3033 }
3034
3035 /*
3036  *  return state of serial control and status signals
3037  */
3038 static int tiocmget(struct tty_struct *tty, struct file *file)
3039 {
3040         struct slgt_info *info = tty->driver_data;
3041         unsigned int result;
3042         unsigned long flags;
3043
3044         spin_lock_irqsave(&info->lock,flags);
3045         get_signals(info);
3046         spin_unlock_irqrestore(&info->lock,flags);
3047
3048         result = ((info->signals & SerialSignal_RTS) ? TIOCM_RTS:0) +
3049                 ((info->signals & SerialSignal_DTR) ? TIOCM_DTR:0) +
3050                 ((info->signals & SerialSignal_DCD) ? TIOCM_CAR:0) +
3051                 ((info->signals & SerialSignal_RI)  ? TIOCM_RNG:0) +
3052                 ((info->signals & SerialSignal_DSR) ? TIOCM_DSR:0) +
3053                 ((info->signals & SerialSignal_CTS) ? TIOCM_CTS:0);
3054
3055         DBGINFO(("%s tiocmget value=%08X\n", info->device_name, result));
3056         return result;
3057 }
3058
3059 /*
3060  * set modem control signals (DTR/RTS)
3061  *
3062  *      cmd     signal command: TIOCMBIS = set bit TIOCMBIC = clear bit
3063  *              TIOCMSET = set/clear signal values
3064  *      value   bit mask for command
3065  */
3066 static int tiocmset(struct tty_struct *tty, struct file *file,
3067                     unsigned int set, unsigned int clear)
3068 {
3069         struct slgt_info *info = tty->driver_data;
3070         unsigned long flags;
3071
3072         DBGINFO(("%s tiocmset(%x,%x)\n", info->device_name, set, clear));
3073
3074         if (set & TIOCM_RTS)
3075                 info->signals |= SerialSignal_RTS;
3076         if (set & TIOCM_DTR)
3077                 info->signals |= SerialSignal_DTR;
3078         if (clear & TIOCM_RTS)
3079                 info->signals &= ~SerialSignal_RTS;
3080         if (clear & TIOCM_DTR)
3081                 info->signals &= ~SerialSignal_DTR;
3082
3083         spin_lock_irqsave(&info->lock,flags);
3084         set_signals(info);
3085         spin_unlock_irqrestore(&info->lock,flags);
3086         return 0;
3087 }
3088
3089 static int carrier_raised(struct tty_port *port)
3090 {
3091         unsigned long flags;
3092         struct slgt_info *info = container_of(port, struct slgt_info, port);
3093
3094         spin_lock_irqsave(&info->lock,flags);
3095         get_signals(info);
3096         spin_unlock_irqrestore(&info->lock,flags);
3097         return (info->signals & SerialSignal_DCD) ? 1 : 0;
3098 }
3099
3100 static void raise_dtr_rts(struct tty_port *port)
3101 {
3102         unsigned long flags;
3103         struct slgt_info *info = container_of(port, struct slgt_info, port);
3104
3105         spin_lock_irqsave(&info->lock,flags);
3106         info->signals |= SerialSignal_RTS + SerialSignal_DTR;
3107         set_signals(info);
3108         spin_unlock_irqrestore(&info->lock,flags);
3109 }
3110
3111
3112 /*
3113  *  block current process until the device is ready to open
3114  */
3115 static int block_til_ready(struct tty_struct *tty, struct file *filp,
3116                            struct slgt_info *info)
3117 {
3118         DECLARE_WAITQUEUE(wait, current);
3119         int             retval;
3120         bool            do_clocal = false;
3121         bool            extra_count = false;
3122         unsigned long   flags;
3123         int             cd;
3124         struct tty_port *port = &info->port;
3125
3126         DBGINFO(("%s block_til_ready\n", tty->driver->name));
3127
3128         if (filp->f_flags & O_NONBLOCK || tty->flags & (1 << TTY_IO_ERROR)){
3129                 /* nonblock mode is set or port is not enabled */
3130                 port->flags |= ASYNC_NORMAL_ACTIVE;
3131                 return 0;
3132         }
3133
3134         if (tty->termios->c_cflag & CLOCAL)
3135                 do_clocal = true;
3136
3137         /* Wait for carrier detect and the line to become
3138          * free (i.e., not in use by the callout).  While we are in
3139          * this loop, port->count is dropped by one, so that
3140          * close() knows when to free things.  We restore it upon
3141          * exit, either normal or abnormal.
3142          */
3143
3144         retval = 0;
3145         add_wait_queue(&port->open_wait, &wait);
3146
3147         spin_lock_irqsave(&info->lock, flags);
3148         if (!tty_hung_up_p(filp)) {
3149                 extra_count = true;
3150                 port->count--;
3151         }
3152         spin_unlock_irqrestore(&info->lock, flags);
3153         port->blocked_open++;
3154
3155         while (1) {
3156                 if ((tty->termios->c_cflag & CBAUD))
3157                         tty_port_raise_dtr_rts(port);
3158
3159                 set_current_state(TASK_INTERRUPTIBLE);
3160
3161                 if (tty_hung_up_p(filp) || !(port->flags & ASYNC_INITIALIZED)){
3162                         retval = (port->flags & ASYNC_HUP_NOTIFY) ?
3163                                         -EAGAIN : -ERESTARTSYS;
3164                         break;
3165                 }
3166
3167                 cd = tty_port_carrier_raised(port);
3168
3169                 if (!(port->flags & ASYNC_CLOSING) && (do_clocal || cd ))
3170                         break;
3171
3172                 if (signal_pending(current)) {
3173                         retval = -ERESTARTSYS;
3174                         break;
3175                 }
3176
3177                 DBGINFO(("%s block_til_ready wait\n", tty->driver->name));
3178                 schedule();
3179         }
3180
3181         set_current_state(TASK_RUNNING);
3182         remove_wait_queue(&port->open_wait, &wait);
3183
3184         if (extra_count)
3185                 port->count++;
3186         port->blocked_open--;
3187
3188         if (!retval)
3189                 port->flags |= ASYNC_NORMAL_ACTIVE;
3190
3191         DBGINFO(("%s block_til_ready ready, rc=%d\n", tty->driver->name, retval));
3192         return retval;
3193 }
3194
3195 static int alloc_tmp_rbuf(struct slgt_info *info)
3196 {
3197         info->tmp_rbuf = kmalloc(info->max_frame_size + 5, GFP_KERNEL);
3198         if (info->tmp_rbuf == NULL)
3199                 return -ENOMEM;
3200         return 0;
3201 }
3202
3203 static void free_tmp_rbuf(struct slgt_info *info)
3204 {
3205         kfree(info->tmp_rbuf);
3206         info->tmp_rbuf = NULL;
3207 }
3208
3209 /*
3210  * allocate DMA descriptor lists.
3211  */
3212 static int alloc_desc(struct slgt_info *info)
3213 {
3214         unsigned int i;
3215         unsigned int pbufs;
3216
3217         /* allocate memory to hold descriptor lists */
3218         info->bufs = pci_alloc_consistent(info->pdev, DESC_LIST_SIZE, &info->bufs_dma_addr);
3219         if (info->bufs == NULL)
3220                 return -ENOMEM;
3221
3222         memset(info->bufs, 0, DESC_LIST_SIZE);
3223
3224         info->rbufs = (struct slgt_desc*)info->bufs;
3225         info->tbufs = ((struct slgt_desc*)info->bufs) + info->rbuf_count;
3226
3227         pbufs = (unsigned int)info->bufs_dma_addr;
3228
3229         /*
3230          * Build circular lists of descriptors
3231          */
3232
3233         for (i=0; i < info->rbuf_count; i++) {
3234                 /* physical address of this descriptor */
3235                 info->rbufs[i].pdesc = pbufs + (i * sizeof(struct slgt_desc));
3236
3237                 /* physical address of next descriptor */
3238                 if (i == info->rbuf_count - 1)
3239                         info->rbufs[i].next = cpu_to_le32(pbufs);
3240                 else
3241                         info->rbufs[i].next = cpu_to_le32(pbufs + ((i+1) * sizeof(struct slgt_desc)));
3242                 set_desc_count(info->rbufs[i], DMABUFSIZE);
3243         }
3244
3245         for (i=0; i < info->tbuf_count; i++) {
3246                 /* physical address of this descriptor */
3247                 info->tbufs[i].pdesc = pbufs + ((info->rbuf_count + i) * sizeof(struct slgt_desc));
3248
3249                 /* physical address of next descriptor */
3250                 if (i == info->tbuf_count - 1)
3251                         info->tbufs[i].next = cpu_to_le32(pbufs + info->rbuf_count * sizeof(struct slgt_desc));
3252                 else
3253                         info->tbufs[i].next = cpu_to_le32(pbufs + ((info->rbuf_count + i + 1) * sizeof(struct slgt_desc)));
3254         }
3255
3256         return 0;
3257 }
3258
3259 static void free_desc(struct slgt_info *info)
3260 {
3261         if (info->bufs != NULL) {
3262                 pci_free_consistent(info->pdev, DESC_LIST_SIZE, info->bufs, info->bufs_dma_addr);
3263                 info->bufs  = NULL;
3264                 info->rbufs = NULL;
3265                 info->tbufs = NULL;
3266         }
3267 }
3268
3269 static int alloc_bufs(struct slgt_info *info, struct slgt_desc *bufs, int count)
3270 {
3271         int i;
3272         for (i=0; i < count; i++) {
3273                 if ((bufs[i].buf = pci_alloc_consistent(info->pdev, DMABUFSIZE, &bufs[i].buf_dma_addr)) == NULL)
3274                         return -ENOMEM;
3275                 bufs[i].pbuf  = cpu_to_le32((unsigned int)bufs[i].buf_dma_addr);
3276         }
3277         return 0;
3278 }
3279
3280 static void free_bufs(struct slgt_info *info, struct slgt_desc *bufs, int count)
3281 {
3282         int i;
3283         for (i=0; i < count; i++) {
3284                 if (bufs[i].buf == NULL)
3285                         continue;
3286                 pci_free_consistent(info->pdev, DMABUFSIZE, bufs[i].buf, bufs[i].buf_dma_addr);
3287                 bufs[i].buf = NULL;
3288         }
3289 }
3290
3291 static int alloc_dma_bufs(struct slgt_info *info)
3292 {
3293         info->rbuf_count = 32;
3294         info->tbuf_count = 32;
3295
3296         if (alloc_desc(info) < 0 ||
3297             alloc_bufs(info, info->rbufs, info->rbuf_count) < 0 ||
3298             alloc_bufs(info, info->tbufs, info->tbuf_count) < 0 ||
3299             alloc_tmp_rbuf(info) < 0) {
3300                 DBGERR(("%s DMA buffer alloc fail\n", info->device_name));
3301                 return -ENOMEM;
3302         }
3303         reset_rbufs(info);
3304         return 0;
3305 }
3306
3307 static void free_dma_bufs(struct slgt_info *info)
3308 {
3309         if (info->bufs) {
3310                 free_bufs(info, info->rbufs, info->rbuf_count);
3311                 free_bufs(info, info->tbufs, info->tbuf_count);
3312                 free_desc(info);
3313         }
3314         free_tmp_rbuf(info);
3315 }
3316
3317 static int claim_resources(struct slgt_info *info)
3318 {
3319         if (request_mem_region(info->phys_reg_addr, SLGT_REG_SIZE, "synclink_gt") == NULL) {
3320                 DBGERR(("%s reg addr conflict, addr=%08X\n",
3321                         info->device_name, info->phys_reg_addr));
3322                 info->init_error = DiagStatus_AddressConflict;
3323                 goto errout;
3324         }
3325         else
3326                 info->reg_addr_requested = true;
3327
3328         info->reg_addr = ioremap_nocache(info->phys_reg_addr, SLGT_REG_SIZE);
3329         if (!info->reg_addr) {
3330                 DBGERR(("%s cant map device registers, addr=%08X\n",
3331                         info->device_name, info->phys_reg_addr));
3332                 info->init_error = DiagStatus_CantAssignPciResources;
3333                 goto errout;
3334         }
3335         return 0;
3336
3337 errout:
3338         release_resources(info);
3339         return -ENODEV;
3340 }
3341
3342 static void release_resources(struct slgt_info *info)
3343 {
3344         if (info->irq_requested) {
3345                 free_irq(info->irq_level, info);
3346                 info->irq_requested = false;
3347         }
3348
3349         if (info->reg_addr_requested) {
3350                 release_mem_region(info->phys_reg_addr, SLGT_REG_SIZE);
3351                 info->reg_addr_requested = false;
3352         }
3353
3354         if (info->reg_addr) {
3355                 iounmap(info->reg_addr);
3356                 info->reg_addr = NULL;
3357         }
3358 }
3359
3360 /* Add the specified device instance data structure to the
3361  * global linked list of devices and increment the device count.
3362  */
3363 static void add_device(struct slgt_info *info)
3364 {
3365         char *devstr;
3366
3367         info->next_device = NULL;
3368         info->line = slgt_device_count;
3369         sprintf(info->device_name, "%s%d", tty_dev_prefix, info->line);
3370
3371         if (info->line < MAX_DEVICES) {
3372                 if (maxframe[info->line])
3373                         info->max_frame_size = maxframe[info->line];
3374         }
3375
3376         slgt_device_count++;
3377
3378         if (!slgt_device_list)
3379                 slgt_device_list = info;
3380         else {
3381                 struct slgt_info *current_dev = slgt_device_list;
3382                 while(current_dev->next_device)
3383                         current_dev = current_dev->next_device;
3384                 current_dev->next_device = info;
3385         }
3386
3387         if (info->max_frame_size < 4096)
3388                 info->max_frame_size = 4096;
3389         else if (info->max_frame_size > 65535)
3390                 info->max_frame_size = 65535;
3391
3392         switch(info->pdev->device) {
3393         case SYNCLINK_GT_DEVICE_ID:
3394                 devstr = "GT";
3395                 break;
3396         case SYNCLINK_GT2_DEVICE_ID:
3397                 devstr = "GT2";
3398                 break;
3399         case SYNCLINK_GT4_DEVICE_ID:
3400                 devstr = "GT4";
3401                 break;
3402         case SYNCLINK_AC_DEVICE_ID:
3403                 devstr = "AC";
3404                 info->params.mode = MGSL_MODE_ASYNC;
3405                 break;
3406         default:
3407                 devstr = "(unknown model)";
3408         }
3409         printk("SyncLink %s %s IO=%08x IRQ=%d MaxFrameSize=%u\n",
3410                 devstr, info->device_name, info->phys_reg_addr,
3411                 info->irq_level, info->max_frame_size);
3412
3413 #if SYNCLINK_GENERIC_HDLC
3414         hdlcdev_init(info);
3415 #endif
3416 }
3417
3418 static const struct tty_port_operations slgt_port_ops = {
3419         .carrier_raised = carrier_raised,
3420         .raise_dtr_rts = raise_dtr_rts,
3421 };
3422
3423 /*
3424  *  allocate device instance structure, return NULL on failure
3425  */
3426 static struct slgt_info *alloc_dev(int adapter_num, int port_num, struct pci_dev *pdev)
3427 {
3428         struct slgt_info *info;
3429
3430         info = kzalloc(sizeof(struct slgt_info), GFP_KERNEL);
3431
3432         if (!info) {
3433                 DBGERR(("%s device alloc failed adapter=%d port=%d\n",
3434                         driver_name, adapter_num, port_num));
3435         } else {
3436                 tty_port_init(&info->port);
3437                 info->port.ops = &slgt_port_ops;
3438                 info->magic = MGSL_MAGIC;
3439                 INIT_WORK(&info->task, bh_handler);
3440                 info->max_frame_size = 4096;
3441                 info->rbuf_fill_level = DMABUFSIZE;
3442                 info->port.close_delay = 5*HZ/10;
3443                 info->port.closing_wait = 30*HZ;
3444                 init_waitqueue_head(&info->status_event_wait_q);
3445                 init_waitqueue_head(&info->event_wait_q);
3446                 spin_lock_init(&info->netlock);
3447                 memcpy(&info->params,&default_params,sizeof(MGSL_PARAMS));
3448                 info->idle_mode = HDLC_TXIDLE_FLAGS;
3449                 info->adapter_num = adapter_num;
3450                 info->port_num = port_num;
3451
3452                 setup_timer(&info->tx_timer, tx_timeout, (unsigned long)info);
3453                 setup_timer(&info->rx_timer, rx_timeout, (unsigned long)info);
3454
3455                 /* Copy configuration info to device instance data */
3456                 info->pdev = pdev;
3457                 info->irq_level = pdev->irq;
3458                 info->phys_reg_addr = pci_resource_start(pdev,0);
3459
3460                 info->bus_type = MGSL_BUS_TYPE_PCI;
3461                 info->irq_flags = IRQF_SHARED;
3462
3463                 info->init_error = -1; /* assume error, set to 0 on successful init */
3464         }
3465
3466         return info;
3467 }
3468
3469 static void device_init(int adapter_num, struct pci_dev *pdev)
3470 {
3471         struct slgt_info *port_array[SLGT_MAX_PORTS];
3472         int i;
3473         int port_count = 1;
3474
3475         if (pdev->device == SYNCLINK_GT2_DEVICE_ID)
3476                 port_count = 2;
3477         else if (pdev->device == SYNCLINK_GT4_DEVICE_ID)
3478                 port_count = 4;
3479
3480         /* allocate device instances for all ports */
3481         for (i=0; i < port_count; ++i) {
3482                 port_array[i] = alloc_dev(adapter_num, i, pdev);
3483                 if (port_array[i] == NULL) {
3484                         for (--i; i >= 0; --i)
3485                                 kfree(port_array[i]);
3486                         return;
3487                 }
3488         }
3489
3490         /* give copy of port_array to all ports and add to device list  */
3491         for (i=0; i < port_count; ++i) {
3492                 memcpy(port_array[i]->port_array, port_array, sizeof(port_array));
3493                 add_device(port_array[i]);
3494                 port_array[i]->port_count = port_count;
3495                 spin_lock_init(&port_array[i]->lock);
3496         }
3497
3498         /* Allocate and claim adapter resources */
3499         if (!claim_resources(port_array[0])) {
3500
3501                 alloc_dma_bufs(port_array[0]);
3502
3503                 /* copy resource information from first port to others */
3504                 for (i = 1; i < port_count; ++i) {
3505                         port_array[i]->lock      = port_array[0]->lock;
3506                         port_array[i]->irq_level = port_array[0]->irq_level;
3507                         port_array[i]->reg_addr  = port_array[0]->reg_addr;
3508                         alloc_dma_bufs(port_array[i]);
3509                 }
3510
3511                 if (request_irq(port_array[0]->irq_level,
3512                                         slgt_interrupt,
3513                                         port_array[0]->irq_flags,
3514                                         port_array[0]->device_name,
3515                                         port_array[0]) < 0) {
3516                         DBGERR(("%s request_irq failed IRQ=%d\n",
3517                                 port_array[0]->device_name,
3518                                 port_array[0]->irq_level));
3519                 } else {
3520                         port_array[0]->irq_requested = true;
3521                         adapter_test(port_array[0]);
3522                         for (i=1 ; i < port_count ; i++) {
3523                                 port_array[i]->init_error = port_array[0]->init_error;
3524                                 port_array[i]->gpio_present = port_array[0]->gpio_present;
3525                         }
3526                 }
3527         }
3528
3529         for (i=0; i < port_count; ++i)
3530                 tty_register_device(serial_driver, port_array[i]->line, &(port_array[i]->pdev->dev));
3531 }
3532
3533 static int __devinit init_one(struct pci_dev *dev,
3534                               const struct pci_device_id *ent)
3535 {
3536         if (pci_enable_device(dev)) {
3537                 printk("error enabling pci device %p\n", dev);
3538                 return -EIO;
3539         }
3540         pci_set_master(dev);
3541         device_init(slgt_device_count, dev);
3542         return 0;
3543 }
3544
3545 static void __devexit remove_one(struct pci_dev *dev)
3546 {
3547 }
3548
3549 static const struct tty_operations ops = {
3550         .open = open,
3551         .close = close,
3552         .write = write,
3553         .put_char = put_char,
3554         .flush_chars = flush_chars,
3555         .write_room = write_room,
3556         .chars_in_buffer = chars_in_buffer,
3557         .flush_buffer = flush_buffer,
3558         .ioctl = ioctl,
3559         .compat_ioctl = slgt_compat_ioctl,
3560         .throttle = throttle,
3561         .unthrottle = unthrottle,
3562         .send_xchar = send_xchar,
3563         .break_ctl = set_break,
3564         .wait_until_sent = wait_until_sent,
3565         .read_proc = read_proc,
3566         .set_termios = set_termios,
3567         .stop = tx_hold,
3568         .start = tx_release,
3569         .hangup = hangup,
3570         .tiocmget = tiocmget,
3571         .tiocmset = tiocmset,
3572 };
3573
3574 static void slgt_cleanup(void)
3575 {
3576         int rc;
3577         struct slgt_info *info;
3578         struct slgt_info *tmp;
3579
3580         printk(KERN_INFO "unload %s\n", driver_name);
3581
3582         if (serial_driver) {
3583                 for (info=slgt_device_list ; info != NULL ; info=info->next_device)
3584                         tty_unregister_device(serial_driver, info->line);
3585                 if ((rc = tty_unregister_driver(serial_driver)))
3586                         DBGERR(("tty_unregister_driver error=%d\n", rc));
3587                 put_tty_driver(serial_driver);
3588         }
3589
3590         /* reset devices */
3591         info = slgt_device_list;
3592         while(info) {
3593                 reset_port(info);
3594                 info = info->next_device;
3595         }
3596
3597         /* release devices */
3598         info = slgt_device_list;
3599         while(info) {
3600 #if SYNCLINK_GENERIC_HDLC
3601                 hdlcdev_exit(info);
3602 #endif
3603                 free_dma_bufs(info);
3604                 free_tmp_rbuf(info);
3605                 if (info->port_num == 0)
3606                         release_resources(info);
3607                 tmp = info;
3608                 info = info->next_device;
3609                 kfree(tmp);
3610         }
3611
3612         if (pci_registered)
3613                 pci_unregister_driver(&pci_driver);
3614 }
3615
3616 /*
3617  *  Driver initialization entry point.
3618  */
3619 static int __init slgt_init(void)
3620 {
3621         int rc;
3622
3623         printk(KERN_INFO "%s\n", driver_name);
3624
3625         serial_driver = alloc_tty_driver(MAX_DEVICES);
3626         if (!serial_driver) {
3627                 printk("%s can't allocate tty driver\n", driver_name);
3628                 return -ENOMEM;
3629         }
3630
3631         /* Initialize the tty_driver structure */
3632
3633         serial_driver->owner = THIS_MODULE;
3634         serial_driver->driver_name = tty_driver_name;
3635         serial_driver->name = tty_dev_prefix;
3636         serial_driver->major = ttymajor;
3637         serial_driver->minor_start = 64;
3638         serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
3639         serial_driver->subtype = SERIAL_TYPE_NORMAL;
3640         serial_driver->init_termios = tty_std_termios;
3641         serial_driver->init_termios.c_cflag =
3642                 B9600 | CS8 | CREAD | HUPCL | CLOCAL;
3643         serial_driver->init_termios.c_ispeed = 9600;
3644         serial_driver->init_termios.c_ospeed = 9600;
3645         serial_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
3646         tty_set_operations(serial_driver, &ops);
3647         if ((rc = tty_register_driver(serial_driver)) < 0) {
3648                 DBGERR(("%s can't register serial driver\n", driver_name));
3649                 put_tty_driver(serial_driver);
3650                 serial_driver = NULL;
3651                 goto error;
3652         }
3653
3654         printk(KERN_INFO "%s, tty major#%d\n",
3655                driver_name, serial_driver->major);
3656
3657         slgt_device_count = 0;
3658         if ((rc = pci_register_driver(&pci_driver)) < 0) {
3659                 printk("%s pci_register_driver error=%d\n", driver_name, rc);
3660                 goto error;
3661         }
3662         pci_registered = true;
3663
3664         if (!slgt_device_list)
3665                 printk("%s no devices found\n",driver_name);
3666
3667         return 0;
3668
3669 error:
3670         slgt_cleanup();
3671         return rc;
3672 }
3673
3674 static void __exit slgt_exit(void)
3675 {
3676         slgt_cleanup();
3677 }
3678
3679 module_init(slgt_init);
3680 module_exit(slgt_exit);
3681
3682 /*
3683  * register access routines
3684  */
3685
3686 #define CALC_REGADDR() \
3687         unsigned long reg_addr = ((unsigned long)info->reg_addr) + addr; \
3688         if (addr >= 0x80) \
3689                 reg_addr += (info->port_num) * 32;
3690
3691 static __u8 rd_reg8(struct slgt_info *info, unsigned int addr)
3692 {
3693         CALC_REGADDR();
3694         return readb((void __iomem *)reg_addr);
3695 }
3696
3697 static void wr_reg8(struct slgt_info *info, unsigned int addr, __u8 value)
3698 {
3699         CALC_REGADDR();
3700         writeb(value, (void __iomem *)reg_addr);
3701 }
3702
3703 static __u16 rd_reg16(struct slgt_info *info, unsigned int addr)
3704 {
3705         CALC_REGADDR();
3706         return readw((void __iomem *)reg_addr);
3707 }
3708
3709 static void wr_reg16(struct slgt_info *info, unsigned int addr, __u16 value)
3710 {
3711         CALC_REGADDR();
3712         writew(value, (void __iomem *)reg_addr);
3713 }
3714
3715 static __u32 rd_reg32(struct slgt_info *info, unsigned int addr)
3716 {
3717         CALC_REGADDR();
3718         return readl((void __iomem *)reg_addr);
3719 }
3720
3721 static void wr_reg32(struct slgt_info *info, unsigned int addr, __u32 value)
3722 {
3723         CALC_REGADDR();
3724         writel(value, (void __iomem *)reg_addr);
3725 }
3726
3727 static void rdma_reset(struct slgt_info *info)
3728 {
3729         unsigned int i;
3730
3731         /* set reset bit */
3732         wr_reg32(info, RDCSR, BIT1);
3733
3734         /* wait for enable bit cleared */
3735         for(i=0 ; i < 1000 ; i++)
3736                 if (!(rd_reg32(info, RDCSR) & BIT0))
3737                         break;
3738 }
3739
3740 static void tdma_reset(struct slgt_info *info)
3741 {
3742         unsigned int i;
3743
3744         /* set reset bit */
3745         wr_reg32(info, TDCSR, BIT1);
3746
3747         /* wait for enable bit cleared */
3748         for(i=0 ; i < 1000 ; i++)
3749                 if (!(rd_reg32(info, TDCSR) & BIT0))
3750                         break;
3751 }
3752
3753 /*
3754  * enable internal loopback
3755  * TxCLK and RxCLK are generated from BRG
3756  * and TxD is looped back to RxD internally.
3757  */
3758 static void enable_loopback(struct slgt_info *info)
3759 {
3760         /* SCR (serial control) BIT2=looopback enable */
3761         wr_reg16(info, SCR, (unsigned short)(rd_reg16(info, SCR) | BIT2));
3762
3763         if (info->params.mode != MGSL_MODE_ASYNC) {
3764                 /* CCR (clock control)
3765                  * 07..05  tx clock source (010 = BRG)
3766                  * 04..02  rx clock source (010 = BRG)
3767                  * 01      auxclk enable   (0 = disable)
3768                  * 00      BRG enable      (1 = enable)
3769                  *
3770                  * 0100 1001
3771                  */
3772                 wr_reg8(info, CCR, 0x49);
3773
3774                 /* set speed if available, otherwise use default */
3775                 if (info->params.clock_speed)
3776                         set_rate(info, info->params.clock_speed);
3777                 else
3778                         set_rate(info, 3686400);
3779         }
3780 }
3781
3782 /*
3783  *  set baud rate generator to specified rate
3784  */
3785 static void set_rate(struct slgt_info *info, u32 rate)
3786 {
3787         unsigned int div;
3788         static unsigned int osc = 14745600;
3789
3790         /* div = osc/rate - 1
3791          *
3792          * Round div up if osc/rate is not integer to
3793          * force to next slowest rate.
3794          */
3795
3796         if (rate) {
3797                 div = osc/rate;
3798                 if (!(osc % rate) && div)
3799                         div--;
3800                 wr_reg16(info, BDR, (unsigned short)div);
3801         }
3802 }
3803
3804 static void rx_stop(struct slgt_info *info)
3805 {
3806         unsigned short val;
3807
3808         /* disable and reset receiver */
3809         val = rd_reg16(info, RCR) & ~BIT1;          /* clear enable bit */
3810         wr_reg16(info, RCR, (unsigned short)(val | BIT2)); /* set reset bit */
3811         wr_reg16(info, RCR, val);                  /* clear reset bit */
3812
3813         slgt_irq_off(info, IRQ_RXOVER + IRQ_RXDATA + IRQ_RXIDLE);
3814
3815         /* clear pending rx interrupts */
3816         wr_reg16(info, SSR, IRQ_RXIDLE + IRQ_RXOVER);
3817
3818         rdma_reset(info);
3819
3820         info->rx_enabled = false;
3821         info->rx_restart = false;
3822 }
3823
3824 static void rx_start(struct slgt_info *info)
3825 {
3826         unsigned short val;
3827
3828         slgt_irq_off(info, IRQ_RXOVER + IRQ_RXDATA);
3829
3830         /* clear pending rx overrun IRQ */
3831         wr_reg16(info, SSR, IRQ_RXOVER);
3832
3833         /* reset and disable receiver */
3834         val = rd_reg16(info, RCR) & ~BIT1; /* clear enable bit */
3835         wr_reg16(info, RCR, (unsigned short)(val | BIT2)); /* set reset bit */
3836         wr_reg16(info, RCR, val);                  /* clear reset bit */
3837
3838         rdma_reset(info);
3839         reset_rbufs(info);
3840
3841         /* set 1st descriptor address */
3842         wr_reg32(info, RDDAR, info->rbufs[0].pdesc);
3843
3844         if (info->params.mode != MGSL_MODE_ASYNC) {
3845                 /* enable rx DMA and DMA interrupt */
3846                 wr_reg32(info, RDCSR, (BIT2 + BIT0));
3847         } else {
3848                 /* enable saving of rx status, rx DMA and DMA interrupt */
3849                 wr_reg32(info, RDCSR, (BIT6 + BIT2 + BIT0));
3850         }
3851
3852         slgt_irq_on(info, IRQ_RXOVER);
3853
3854         /* enable receiver */
3855         wr_reg16(info, RCR, (unsigned short)(rd_reg16(info, RCR) | BIT1));
3856
3857         info->rx_restart = false;
3858         info->rx_enabled = true;
3859 }
3860
3861 static void tx_start(struct slgt_info *info)
3862 {
3863         if (!info->tx_enabled) {
3864                 wr_reg16(info, TCR,
3865                          (unsigned short)((rd_reg16(info, TCR) | BIT1) & ~BIT2));
3866                 info->tx_enabled = true;
3867         }
3868
3869         if (info->tx_count) {
3870                 info->drop_rts_on_tx_done = false;
3871
3872                 if (info->params.mode != MGSL_MODE_ASYNC) {
3873                         if (info->params.flags & HDLC_FLAG_AUTO_RTS) {
3874                                 get_signals(info);
3875                                 if (!(info->signals & SerialSignal_RTS)) {
3876                                         info->signals |= SerialSignal_RTS;
3877                                         set_signals(info);
3878                                         info->drop_rts_on_tx_done = true;
3879                                 }
3880                         }
3881
3882                         slgt_irq_off(info, IRQ_TXDATA);
3883                         slgt_irq_on(info, IRQ_TXUNDER + IRQ_TXIDLE);
3884                         /* clear tx idle and underrun status bits */
3885                         wr_reg16(info, SSR, (unsigned short)(IRQ_TXIDLE + IRQ_TXUNDER));
3886                         if (info->params.mode == MGSL_MODE_HDLC)
3887                                 mod_timer(&info->tx_timer, jiffies +
3888                                                 msecs_to_jiffies(5000));
3889                 } else {
3890                         slgt_irq_off(info, IRQ_TXDATA);
3891                         slgt_irq_on(info, IRQ_TXIDLE);
3892                         /* clear tx idle status bit */
3893                         wr_reg16(info, SSR, IRQ_TXIDLE);
3894                 }
3895                 tdma_start(info);
3896                 info->tx_active = true;
3897         }
3898 }
3899
3900 /*
3901  * start transmit DMA if inactive and there are unsent buffers
3902  */
3903 static void tdma_start(struct slgt_info *info)
3904 {
3905         unsigned int i;
3906
3907         if (rd_reg32(info, TDCSR) & BIT0)
3908                 return;
3909
3910         /* transmit DMA inactive, check for unsent buffers */
3911         i = info->tbuf_start;
3912         while (!desc_count(info->tbufs[i])) {
3913                 if (++i == info->tbuf_count)
3914                         i = 0;
3915                 if (i == info->tbuf_current)
3916                         return;
3917         }
3918         info->tbuf_start = i;
3919
3920         /* there are unsent buffers, start transmit DMA */
3921
3922         /* reset needed if previous error condition */
3923         tdma_reset(info);
3924
3925         /* set 1st descriptor address */
3926         wr_reg32(info, TDDAR, info->tbufs[info->tbuf_start].pdesc);
3927         wr_reg32(info, TDCSR, BIT2 + BIT0); /* IRQ + DMA enable */
3928 }
3929
3930 static void tx_stop(struct slgt_info *info)
3931 {
3932         unsigned short val;
3933
3934         del_timer(&info->tx_timer);
3935
3936         tdma_reset(info);
3937
3938         /* reset and disable transmitter */
3939         val = rd_reg16(info, TCR) & ~BIT1;          /* clear enable bit */
3940         wr_reg16(info, TCR, (unsigned short)(val | BIT2)); /* set reset bit */
3941
3942         slgt_irq_off(info, IRQ_TXDATA + IRQ_TXIDLE + IRQ_TXUNDER);
3943
3944         /* clear tx idle and underrun status bit */
3945         wr_reg16(info, SSR, (unsigned short)(IRQ_TXIDLE + IRQ_TXUNDER));
3946
3947         reset_tbufs(info);
3948
3949         info->tx_enabled = false;
3950         info->tx_active = false;
3951 }
3952
3953 static void reset_port(struct slgt_info *info)
3954 {
3955         if (!info->reg_addr)
3956                 return;
3957
3958         tx_stop(info);
3959         rx_stop(info);
3960
3961         info->signals &= ~(SerialSignal_DTR + SerialSignal_RTS);
3962         set_signals(info);
3963
3964         slgt_irq_off(info, IRQ_ALL | IRQ_MASTER);
3965 }
3966
3967 static void reset_adapter(struct slgt_info *info)
3968 {
3969         int i;
3970         for (i=0; i < info->port_count; ++i) {
3971                 if (info->port_array[i])
3972                         reset_port(info->port_array[i]);
3973         }
3974 }
3975
3976 static void async_mode(struct slgt_info *info)
3977 {
3978         unsigned short val;
3979
3980         slgt_irq_off(info, IRQ_ALL | IRQ_MASTER);
3981         tx_stop(info);
3982         rx_stop(info);
3983
3984         /* TCR (tx control)
3985          *
3986          * 15..13  mode, 010=async
3987          * 12..10  encoding, 000=NRZ
3988          * 09      parity enable
3989          * 08      1=odd parity, 0=even parity
3990          * 07      1=RTS driver control
3991          * 06      1=break enable
3992          * 05..04  character length
3993          *         00=5 bits
3994          *         01=6 bits
3995          *         10=7 bits
3996          *         11=8 bits
3997          * 03      0=1 stop bit, 1=2 stop bits
3998          * 02      reset
3999          * 01      enable
4000          * 00      auto-CTS enable
4001          */
4002         val = 0x4000;
4003
4004         if (info->if_mode & MGSL_INTERFACE_RTS_EN)
4005                 val |= BIT7;
4006
4007         if (info->params.parity != ASYNC_PARITY_NONE) {
4008                 val |= BIT9;
4009                 if (info->params.parity == ASYNC_PARITY_ODD)
4010                         val |= BIT8;
4011         }
4012
4013         switch (info->params.data_bits)
4014         {
4015         case 6: val |= BIT4; break;
4016         case 7: val |= BIT5; break;
4017         case 8: val |= BIT5 + BIT4; break;
4018         }
4019
4020         if (info->params.stop_bits != 1)
4021                 val |= BIT3;
4022
4023         if (info->params.flags & HDLC_FLAG_AUTO_CTS)
4024                 val |= BIT0;
4025
4026         wr_reg16(info, TCR, val);
4027
4028         /* RCR (rx control)
4029          *
4030          * 15..13  mode, 010=async
4031          * 12..10  encoding, 000=NRZ
4032          * 09      parity enable
4033          * 08      1=odd parity, 0=even parity
4034          * 07..06  reserved, must be 0
4035          * 05..04  character length
4036          *         00=5 bits
4037          *         01=6 bits
4038          *         10=7 bits
4039          *         11=8 bits
4040          * 03      reserved, must be zero
4041          * 02      reset
4042          * 01      enable
4043          * 00      auto-DCD enable
4044          */
4045         val = 0x4000;
4046
4047         if (info->params.parity != ASYNC_PARITY_NONE) {
4048                 val |= BIT9;
4049                 if (info->params.parity == ASYNC_PARITY_ODD)
4050                         val |= BIT8;
4051         }
4052
4053         switch (info->params.data_bits)
4054         {
4055         case 6: val |= BIT4; break;
4056         case 7: val |= BIT5; break;
4057         case 8: val |= BIT5 + BIT4; break;
4058         }
4059
4060         if (info->params.flags & HDLC_FLAG_AUTO_DCD)
4061                 val |= BIT0;
4062
4063         wr_reg16(info, RCR, val);
4064
4065         /* CCR (clock control)
4066          *
4067          * 07..05  011 = tx clock source is BRG/16
4068          * 04..02  010 = rx clock source is BRG
4069          * 01      0 = auxclk disabled
4070          * 00      1 = BRG enabled
4071          *
4072          * 0110 1001
4073          */
4074         wr_reg8(info, CCR, 0x69);
4075
4076         msc_set_vcr(info);
4077
4078         /* SCR (serial control)
4079          *
4080          * 15  1=tx req on FIFO half empty
4081          * 14  1=rx req on FIFO half full
4082          * 13  tx data  IRQ enable
4083          * 12  tx idle  IRQ enable
4084          * 11  rx break on IRQ enable
4085          * 10  rx data  IRQ enable
4086          * 09  rx break off IRQ enable
4087          * 08  overrun  IRQ enable
4088          * 07  DSR      IRQ enable
4089          * 06  CTS      IRQ enable
4090          * 05  DCD      IRQ enable
4091          * 04  RI       IRQ enable
4092          * 03  reserved, must be zero
4093          * 02  1=txd->rxd internal loopback enable
4094          * 01  reserved, must be zero
4095          * 00  1=master IRQ enable
4096          */
4097         val = BIT15 + BIT14 + BIT0;
4098         wr_reg16(info, SCR, val);
4099
4100         slgt_irq_on(info, IRQ_RXBREAK | IRQ_RXOVER);
4101
4102         set_rate(info, info->params.data_rate * 16);
4103
4104         if (info->params.loopback)
4105                 enable_loopback(info);
4106 }
4107
4108 static void sync_mode(struct slgt_info *info)
4109 {
4110         unsigned short val;
4111
4112         slgt_irq_off(info, IRQ_ALL | IRQ_MASTER);
4113         tx_stop(info);
4114         rx_stop(info);
4115
4116         /* TCR (tx control)
4117          *
4118          * 15..13  mode, 000=HDLC 001=raw 010=async 011=monosync 100=bisync
4119          * 12..10  encoding
4120          * 09      CRC enable
4121          * 08      CRC32
4122          * 07      1=RTS driver control
4123          * 06      preamble enable
4124          * 05..04  preamble length
4125          * 03      share open/close flag
4126          * 02      reset
4127          * 01      enable
4128          * 00      auto-CTS enable
4129          */
4130         val = BIT2;
4131
4132         switch(info->params.mode) {
4133         case MGSL_MODE_MONOSYNC: val |= BIT14 + BIT13; break;
4134         case MGSL_MODE_BISYNC:   val |= BIT15; break;
4135         case MGSL_MODE_RAW:      val |= BIT13; break;
4136         }
4137         if (info->if_mode & MGSL_INTERFACE_RTS_EN)
4138                 val |= BIT7;
4139
4140         switch(info->params.encoding)
4141         {
4142         case HDLC_ENCODING_NRZB:          val |= BIT10; break;
4143         case HDLC_ENCODING_NRZI_MARK:     val |= BIT11; break;
4144         case HDLC_ENCODING_NRZI:          val |= BIT11 + BIT10; break;
4145         case HDLC_ENCODING_BIPHASE_MARK:  val |= BIT12; break;
4146         case HDLC_ENCODING_BIPHASE_SPACE: val |= BIT12 + BIT10; break;
4147         case HDLC_ENCODING_BIPHASE_LEVEL: val |= BIT12 + BIT11; break;
4148         case HDLC_ENCODING_DIFF_BIPHASE_LEVEL: val |= BIT12 + BIT11 + BIT10; break;
4149         }
4150
4151         switch (info->params.crc_type & HDLC_CRC_MASK)
4152         {
4153         case HDLC_CRC_16_CCITT: val |= BIT9; break;
4154         case HDLC_CRC_32_CCITT: val |= BIT9 + BIT8; break;
4155         }
4156
4157         if (info->params.preamble != HDLC_PREAMBLE_PATTERN_NONE)
4158                 val |= BIT6;
4159
4160         switch (info->params.preamble_length)
4161         {
4162         case HDLC_PREAMBLE_LENGTH_16BITS: val |= BIT5; break;
4163         case HDLC_PREAMBLE_LENGTH_32BITS: val |= BIT4; break;
4164         case HDLC_PREAMBLE_LENGTH_64BITS: val |= BIT5 + BIT4; break;
4165         }
4166
4167         if (info->params.flags & HDLC_FLAG_AUTO_CTS)
4168                 val |= BIT0;
4169
4170         wr_reg16(info, TCR, val);
4171
4172         /* TPR (transmit preamble) */
4173
4174         switch (info->params.preamble)
4175         {
4176         case HDLC_PREAMBLE_PATTERN_FLAGS: val = 0x7e; break;
4177         case HDLC_PREAMBLE_PATTERN_ONES:  val = 0xff; break;
4178         case HDLC_PREAMBLE_PATTERN_ZEROS: val = 0x00; break;
4179         case HDLC_PREAMBLE_PATTERN_10:    val = 0x55; break;
4180         case HDLC_PREAMBLE_PATTERN_01:    val = 0xaa; break;
4181         default:                          val = 0x7e; break;
4182         }
4183         wr_reg8(info, TPR, (unsigned char)val);
4184
4185         /* RCR (rx control)
4186          *
4187          * 15..13  mode, 000=HDLC 001=raw 010=async 011=monosync 100=bisync
4188          * 12..10  encoding
4189          * 09      CRC enable
4190          * 08      CRC32
4191          * 07..03  reserved, must be 0
4192          * 02      reset
4193          * 01      enable
4194          * 00      auto-DCD enable
4195          */
4196         val = 0;
4197
4198         switch(info->params.mode) {
4199         case MGSL_MODE_MONOSYNC: val |= BIT14 + BIT13; break;
4200         case MGSL_MODE_BISYNC:   val |= BIT15; break;
4201         case MGSL_MODE_RAW:      val |= BIT13; break;
4202         }
4203
4204         switch(info->params.encoding)
4205         {
4206         case HDLC_ENCODING_NRZB:          val |= BIT10; break;
4207         case HDLC_ENCODING_NRZI_MARK:     val |= BIT11; break;
4208         case HDLC_ENCODING_NRZI:          val |= BIT11 + BIT10; break;
4209         case HDLC_ENCODING_BIPHASE_MARK:  val |= BIT12; break;
4210         case HDLC_ENCODING_BIPHASE_SPACE: val |= BIT12 + BIT10; break;
4211         case HDLC_ENCODING_BIPHASE_LEVEL: val |= BIT12 + BIT11; break;
4212         case HDLC_ENCODING_DIFF_BIPHASE_LEVEL: val |= BIT12 + BIT11 + BIT10; break;
4213         }
4214
4215         switch (info->params.crc_type & HDLC_CRC_MASK)
4216         {
4217         case HDLC_CRC_16_CCITT: val |= BIT9; break;
4218         case HDLC_CRC_32_CCITT: val |= BIT9 + BIT8; break;
4219         }
4220
4221         if (info->params.flags & HDLC_FLAG_AUTO_DCD)
4222                 val |= BIT0;
4223
4224         wr_reg16(info, RCR, val);
4225
4226         /* CCR (clock control)
4227          *
4228          * 07..05  tx clock source
4229          * 04..02  rx clock source
4230          * 01      auxclk enable
4231          * 00      BRG enable
4232          */
4233         val = 0;
4234
4235         if (info->params.flags & HDLC_FLAG_TXC_BRG)
4236         {
4237                 // when RxC source is DPLL, BRG generates 16X DPLL
4238                 // reference clock, so take TxC from BRG/16 to get
4239                 // transmit clock at actual data rate
4240                 if (info->params.flags & HDLC_FLAG_RXC_DPLL)
4241                         val |= BIT6 + BIT5;     /* 011, txclk = BRG/16 */
4242                 else
4243                         val |= BIT6;    /* 010, txclk = BRG */
4244         }
4245         else if (info->params.flags & HDLC_FLAG_TXC_DPLL)
4246                 val |= BIT7;    /* 100, txclk = DPLL Input */
4247         else if (info->params.flags & HDLC_FLAG_TXC_RXCPIN)
4248                 val |= BIT5;    /* 001, txclk = RXC Input */
4249
4250         if (info->params.flags & HDLC_FLAG_RXC_BRG)
4251                 val |= BIT3;    /* 010, rxclk = BRG */
4252         else if (info->params.flags & HDLC_FLAG_RXC_DPLL)
4253                 val |= BIT4;    /* 100, rxclk = DPLL */
4254         else if (info->params.flags & HDLC_FLAG_RXC_TXCPIN)
4255                 val |= BIT2;    /* 001, rxclk = TXC Input */
4256
4257         if (info->params.clock_speed)
4258                 val |= BIT1 + BIT0;
4259
4260         wr_reg8(info, CCR, (unsigned char)val);
4261
4262         if (info->params.flags & (HDLC_FLAG_TXC_DPLL + HDLC_FLAG_RXC_DPLL))
4263         {
4264                 // program DPLL mode
4265                 switch(info->params.encoding)
4266                 {
4267                 case HDLC_ENCODING_BIPHASE_MARK:
4268                 case HDLC_ENCODING_BIPHASE_SPACE:
4269                         val = BIT7; break;
4270                 case HDLC_ENCODING_BIPHASE_LEVEL:
4271                 case HDLC_ENCODING_DIFF_BIPHASE_LEVEL:
4272                         val = BIT7 + BIT6; break;
4273                 default: val = BIT6;    // NRZ encodings
4274                 }
4275                 wr_reg16(info, RCR, (unsigned short)(rd_reg16(info, RCR) | val));
4276
4277                 // DPLL requires a 16X reference clock from BRG
4278                 set_rate(info, info->params.clock_speed * 16);
4279         }
4280         else
4281                 set_rate(info, info->params.clock_speed);
4282
4283         tx_set_idle(info);
4284
4285         msc_set_vcr(info);
4286
4287         /* SCR (serial control)
4288          *
4289          * 15  1=tx req on FIFO half empty
4290          * 14  1=rx req on FIFO half full
4291          * 13  tx data  IRQ enable
4292          * 12  tx idle  IRQ enable
4293          * 11  underrun IRQ enable
4294          * 10  rx data  IRQ enable
4295          * 09  rx idle  IRQ enable
4296          * 08  overrun  IRQ enable
4297          * 07  DSR      IRQ enable
4298          * 06  CTS      IRQ enable
4299          * 05  DCD      IRQ enable
4300          * 04  RI       IRQ enable
4301          * 03  reserved, must be zero
4302          * 02  1=txd->rxd internal loopback enable
4303          * 01  reserved, must be zero
4304          * 00  1=master IRQ enable
4305          */
4306         wr_reg16(info, SCR, BIT15 + BIT14 + BIT0);
4307
4308         if (info->params.loopback)
4309                 enable_loopback(info);
4310 }
4311
4312 /*
4313  *  set transmit idle mode
4314  */
4315 static void tx_set_idle(struct slgt_info *info)
4316 {
4317         unsigned char val;
4318         unsigned short tcr;
4319
4320         /* if preamble enabled (tcr[6] == 1) then tx idle size = 8 bits
4321          * else tcr[5:4] = tx idle size: 00 = 8 bits, 01 = 16 bits
4322          */
4323         tcr = rd_reg16(info, TCR);
4324         if (info->idle_mode & HDLC_TXIDLE_CUSTOM_16) {
4325                 /* disable preamble, set idle size to 16 bits */
4326                 tcr = (tcr & ~(BIT6 + BIT5)) | BIT4;
4327                 /* MSB of 16 bit idle specified in tx preamble register (TPR) */
4328                 wr_reg8(info, TPR, (unsigned char)((info->idle_mode >> 8) & 0xff));
4329         } else if (!(tcr & BIT6)) {
4330                 /* preamble is disabled, set idle size to 8 bits */
4331                 tcr &= ~(BIT5 + BIT4);
4332         }
4333         wr_reg16(info, TCR, tcr);
4334
4335         if (info->idle_mode & (HDLC_TXIDLE_CUSTOM_8 | HDLC_TXIDLE_CUSTOM_16)) {
4336                 /* LSB of custom tx idle specified in tx idle register */
4337                 val = (unsigned char)(info->idle_mode & 0xff);
4338         } else {
4339                 /* standard 8 bit idle patterns */
4340                 switch(info->idle_mode)
4341                 {
4342                 case HDLC_TXIDLE_FLAGS:          val = 0x7e; break;
4343                 case HDLC_TXIDLE_ALT_ZEROS_ONES:
4344                 case HDLC_TXIDLE_ALT_MARK_SPACE: val = 0xaa; break;
4345                 case HDLC_TXIDLE_ZEROS:
4346                 case HDLC_TXIDLE_SPACE:          val = 0x00; break;
4347                 default:                         val = 0xff;
4348                 }
4349         }
4350
4351         wr_reg8(info, TIR, val);
4352 }
4353
4354 /*
4355  * get state of V24 status (input) signals
4356  */
4357 static void get_signals(struct slgt_info *info)
4358 {
4359         unsigned short status = rd_reg16(info, SSR);
4360
4361         /* clear all serial signals except DTR and RTS */
4362         info->signals &= SerialSignal_DTR + SerialSignal_RTS;
4363
4364         if (status & BIT3)
4365                 info->signals |= SerialSignal_DSR;
4366         if (status & BIT2)
4367                 info->signals |= SerialSignal_CTS;
4368         if (status & BIT1)
4369                 info->signals |= SerialSignal_DCD;
4370         if (status & BIT0)
4371                 info->signals |= SerialSignal_RI;
4372 }
4373
4374 /*
4375  * set V.24 Control Register based on current configuration
4376  */
4377 static void msc_set_vcr(struct slgt_info *info)
4378 {
4379         unsigned char val = 0;
4380
4381         /* VCR (V.24 control)
4382          *
4383          * 07..04  serial IF select
4384          * 03      DTR
4385          * 02      RTS
4386          * 01      LL
4387          * 00      RL
4388          */
4389
4390         switch(info->if_mode & MGSL_INTERFACE_MASK)
4391         {
4392         case MGSL_INTERFACE_RS232:
4393                 val |= BIT5; /* 0010 */
4394                 break;
4395         case MGSL_INTERFACE_V35:
4396                 val |= BIT7 + BIT6 + BIT5; /* 1110 */
4397                 break;
4398         case MGSL_INTERFACE_RS422:
4399                 val |= BIT6; /* 0100 */
4400                 break;
4401         }
4402
4403         if (info->if_mode & MGSL_INTERFACE_MSB_FIRST)
4404                 val |= BIT4;
4405         if (info->signals & SerialSignal_DTR)
4406                 val |= BIT3;
4407         if (info->signals & SerialSignal_RTS)
4408                 val |= BIT2;
4409         if (info->if_mode & MGSL_INTERFACE_LL)
4410                 val |= BIT1;
4411         if (info->if_mode & MGSL_INTERFACE_RL)
4412                 val |= BIT0;
4413         wr_reg8(info, VCR, val);
4414 }
4415
4416 /*
4417  * set state of V24 control (output) signals
4418  */
4419 static void set_signals(struct slgt_info *info)
4420 {
4421         unsigned char val = rd_reg8(info, VCR);
4422         if (info->signals & SerialSignal_DTR)
4423                 val |= BIT3;
4424         else
4425                 val &= ~BIT3;
4426         if (info->signals & SerialSignal_RTS)
4427                 val |= BIT2;
4428         else
4429                 val &= ~BIT2;
4430         wr_reg8(info, VCR, val);
4431 }
4432
4433 /*
4434  * free range of receive DMA buffers (i to last)
4435  */
4436 static void free_rbufs(struct slgt_info *info, unsigned int i, unsigned int last)
4437 {
4438         int done = 0;
4439
4440         while(!done) {
4441                 /* reset current buffer for reuse */
4442                 info->rbufs[i].status = 0;
4443                 set_desc_count(info->rbufs[i], info->rbuf_fill_level);
4444                 if (i == last)
4445                         done = 1;
4446                 if (++i == info->rbuf_count)
4447                         i = 0;
4448         }
4449         info->rbuf_current = i;
4450 }
4451
4452 /*
4453  * mark all receive DMA buffers as free
4454  */
4455 static void reset_rbufs(struct slgt_info *info)
4456 {
4457         free_rbufs(info, 0, info->rbuf_count - 1);
4458 }
4459
4460 /*
4461  * pass receive HDLC frame to upper layer
4462  *
4463  * return true if frame available, otherwise false
4464  */
4465 static bool rx_get_frame(struct slgt_info *info)
4466 {
4467         unsigned int start, end;
4468         unsigned short status;
4469         unsigned int framesize = 0;
4470         unsigned long flags;
4471         struct tty_struct *tty = info->port.tty;
4472         unsigned char addr_field = 0xff;
4473         unsigned int crc_size = 0;
4474
4475         switch (info->params.crc_type & HDLC_CRC_MASK) {
4476         case HDLC_CRC_16_CCITT: crc_size = 2; break;
4477         case HDLC_CRC_32_CCITT: crc_size = 4; break;
4478         }
4479
4480 check_again:
4481
4482         framesize = 0;
4483         addr_field = 0xff;
4484         start = end = info->rbuf_current;
4485
4486         for (;;) {
4487                 if (!desc_complete(info->rbufs[end]))
4488                         goto cleanup;
4489
4490                 if (framesize == 0 && info->params.addr_filter != 0xff)
4491                         addr_field = info->rbufs[end].buf[0];
4492
4493                 framesize += desc_count(info->rbufs[end]);
4494
4495                 if (desc_eof(info->rbufs[end]))
4496                         break;
4497
4498                 if (++end == info->rbuf_count)
4499                         end = 0;
4500
4501                 if (end == info->rbuf_current) {
4502                         if (info->rx_enabled){
4503                                 spin_lock_irqsave(&info->lock,flags);
4504                                 rx_start(info);
4505                                 spin_unlock_irqrestore(&info->lock,flags);
4506                         }
4507                         goto cleanup;
4508                 }
4509         }
4510
4511         /* status
4512          *
4513          * 15      buffer complete
4514          * 14..06  reserved
4515          * 05..04  residue
4516          * 02      eof (end of frame)
4517          * 01      CRC error
4518          * 00      abort
4519          */
4520         status = desc_status(info->rbufs[end]);
4521
4522         /* ignore CRC bit if not using CRC (bit is undefined) */
4523         if ((info->params.crc_type & HDLC_CRC_MASK) == HDLC_CRC_NONE)
4524                 status &= ~BIT1;
4525
4526         if (framesize == 0 ||
4527                  (addr_field != 0xff && addr_field != info->params.addr_filter)) {
4528                 free_rbufs(info, start, end);
4529                 goto check_again;
4530         }
4531
4532         if (framesize < (2 + crc_size) || status & BIT0) {
4533                 info->icount.rxshort++;
4534                 framesize = 0;
4535         } else if (status & BIT1) {
4536                 info->icount.rxcrc++;
4537                 if (!(info->params.crc_type & HDLC_CRC_RETURN_EX))
4538                         framesize = 0;
4539         }
4540
4541 #if SYNCLINK_GENERIC_HDLC
4542         if (framesize == 0) {
4543                 info->netdev->stats.rx_errors++;
4544                 info->netdev->stats.rx_frame_errors++;
4545         }
4546 #endif
4547
4548         DBGBH(("%s rx frame status=%04X size=%d\n",
4549                 info->device_name, status, framesize));
4550         DBGDATA(info, info->rbufs[start].buf, min_t(int, framesize, info->rbuf_fill_level), "rx");
4551
4552         if (framesize) {
4553                 if (!(info->params.crc_type & HDLC_CRC_RETURN_EX)) {
4554                         framesize -= crc_size;
4555                         crc_size = 0;
4556                 }
4557
4558                 if (framesize > info->max_frame_size + crc_size)
4559                         info->icount.rxlong++;
4560                 else {
4561                         /* copy dma buffer(s) to contiguous temp buffer */
4562                         int copy_count = framesize;
4563                         int i = start;
4564                         unsigned char *p = info->tmp_rbuf;
4565                         info->tmp_rbuf_count = framesize;
4566
4567                         info->icount.rxok++;
4568
4569                         while(copy_count) {
4570                                 int partial_count = min_t(int, copy_count, info->rbuf_fill_level);
4571                                 memcpy(p, info->rbufs[i].buf, partial_count);
4572                                 p += partial_count;
4573                                 copy_count -= partial_count;
4574                                 if (++i == info->rbuf_count)
4575                                         i = 0;
4576                         }
4577
4578                         if (info->params.crc_type & HDLC_CRC_RETURN_EX) {
4579                                 *p = (status & BIT1) ? RX_CRC_ERROR : RX_OK;
4580                                 framesize++;
4581                         }
4582
4583 #if SYNCLINK_GENERIC_HDLC
4584                         if (info->netcount)
4585                                 hdlcdev_rx(info,info->tmp_rbuf, framesize);
4586                         else
4587 #endif
4588                                 ldisc_receive_buf(tty, info->tmp_rbuf, info->flag_buf, framesize);
4589                 }
4590         }
4591         free_rbufs(info, start, end);
4592         return true;
4593
4594 cleanup:
4595         return false;
4596 }
4597
4598 /*
4599  * pass receive buffer (RAW synchronous mode) to tty layer
4600  * return true if buffer available, otherwise false
4601  */
4602 static bool rx_get_buf(struct slgt_info *info)
4603 {
4604         unsigned int i = info->rbuf_current;
4605         unsigned int count;
4606
4607         if (!desc_complete(info->rbufs[i]))
4608                 return false;
4609         count = desc_count(info->rbufs[i]);
4610         switch(info->params.mode) {
4611         case MGSL_MODE_MONOSYNC:
4612         case MGSL_MODE_BISYNC:
4613                 /* ignore residue in byte synchronous modes */
4614                 if (desc_residue(info->rbufs[i]))
4615                         count--;
4616                 break;
4617         }
4618         DBGDATA(info, info->rbufs[i].buf, count, "rx");
4619         DBGINFO(("rx_get_buf size=%d\n", count));
4620         if (count)
4621                 ldisc_receive_buf(info->port.tty, info->rbufs[i].buf,
4622                                   info->flag_buf, count);
4623         free_rbufs(info, i, i);
4624         return true;
4625 }
4626
4627 static void reset_tbufs(struct slgt_info *info)
4628 {
4629         unsigned int i;
4630         info->tbuf_current = 0;
4631         for (i=0 ; i < info->tbuf_count ; i++) {
4632                 info->tbufs[i].status = 0;
4633                 info->tbufs[i].count  = 0;
4634         }
4635 }
4636
4637 /*
4638  * return number of free transmit DMA buffers
4639  */
4640 static unsigned int free_tbuf_count(struct slgt_info *info)
4641 {
4642         unsigned int count = 0;
4643         unsigned int i = info->tbuf_current;
4644
4645         do
4646         {
4647                 if (desc_count(info->tbufs[i]))
4648                         break; /* buffer in use */
4649                 ++count;
4650                 if (++i == info->tbuf_count)
4651                         i=0;
4652         } while (i != info->tbuf_current);
4653
4654         /* if tx DMA active, last zero count buffer is in use */
4655         if (count && (rd_reg32(info, TDCSR) & BIT0))
4656                 --count;
4657
4658         return count;
4659 }
4660
4661 /*
4662  * return number of bytes in unsent transmit DMA buffers
4663  * and the serial controller tx FIFO
4664  */
4665 static unsigned int tbuf_bytes(struct slgt_info *info)
4666 {
4667         unsigned int total_count = 0;
4668         unsigned int i = info->tbuf_current;
4669         unsigned int reg_value;
4670         unsigned int count;
4671         unsigned int active_buf_count = 0;
4672
4673         /*
4674          * Add descriptor counts for all tx DMA buffers.
4675          * If count is zero (cleared by DMA controller after read),
4676          * the buffer is complete or is actively being read from.
4677          *
4678          * Record buf_count of last buffer with zero count starting
4679          * from current ring position. buf_count is mirror
4680          * copy of count and is not cleared by serial controller.
4681          * If DMA controller is active, that buffer is actively
4682          * being read so add to total.
4683          */
4684         do {
4685                 count = desc_count(info->tbufs[i]);
4686                 if (count)
4687                         total_count += count;
4688                 else if (!total_count)
4689                         active_buf_count = info->tbufs[i].buf_count;
4690                 if (++i == info->tbuf_count)
4691                         i = 0;
4692         } while (i != info->tbuf_current);
4693
4694         /* read tx DMA status register */
4695         reg_value = rd_reg32(info, TDCSR);
4696
4697         /* if tx DMA active, last zero count buffer is in use */
4698         if (reg_value & BIT0)
4699                 total_count += active_buf_count;
4700
4701         /* add tx FIFO count = reg_value[15..8] */
4702         total_count += (reg_value >> 8) & 0xff;
4703
4704         /* if transmitter active add one byte for shift register */
4705         if (info->tx_active)
4706                 total_count++;
4707
4708         return total_count;
4709 }
4710
4711 /*
4712  * load transmit DMA buffer(s) with data
4713  */
4714 static void tx_load(struct slgt_info *info, const char *buf, unsigned int size)
4715 {
4716         unsigned short count;
4717         unsigned int i;
4718         struct slgt_desc *d;
4719
4720         if (size == 0)
4721                 return;
4722
4723         DBGDATA(info, buf, size, "tx");
4724
4725         info->tbuf_start = i = info->tbuf_current;
4726
4727         while (size) {
4728                 d = &info->tbufs[i];
4729                 if (++i == info->tbuf_count)
4730                         i = 0;
4731
4732                 count = (unsigned short)((size > DMABUFSIZE) ? DMABUFSIZE : size);
4733                 memcpy(d->buf, buf, count);
4734
4735                 size -= count;
4736                 buf  += count;
4737
4738                 /*
4739                  * set EOF bit for last buffer of HDLC frame or
4740                  * for every buffer in raw mode
4741                  */
4742                 if ((!size && info->params.mode == MGSL_MODE_HDLC) ||
4743                     info->params.mode == MGSL_MODE_RAW)
4744                         set_desc_eof(*d, 1);
4745                 else
4746                         set_desc_eof(*d, 0);
4747
4748                 set_desc_count(*d, count);
4749                 d->buf_count = count;
4750         }
4751
4752         info->tbuf_current = i;
4753 }
4754
4755 static int register_test(struct slgt_info *info)
4756 {
4757         static unsigned short patterns[] =
4758                 {0x0000, 0xffff, 0xaaaa, 0x5555, 0x6969, 0x9696};
4759         static unsigned int count = sizeof(patterns)/sizeof(patterns[0]);
4760         unsigned int i;
4761         int rc = 0;
4762
4763         for (i=0 ; i < count ; i++) {
4764                 wr_reg16(info, TIR, patterns[i]);
4765                 wr_reg16(info, BDR, patterns[(i+1)%count]);
4766                 if ((rd_reg16(info, TIR) != patterns[i]) ||
4767                     (rd_reg16(info, BDR) != patterns[(i+1)%count])) {
4768                         rc = -ENODEV;
4769                         break;
4770                 }
4771         }
4772         info->gpio_present = (rd_reg32(info, JCR) & BIT5) ? 1 : 0;
4773         info->init_error = rc ? 0 : DiagStatus_AddressFailure;
4774         return rc;
4775 }
4776
4777 static int irq_test(struct slgt_info *info)
4778 {
4779         unsigned long timeout;
4780         unsigned long flags;
4781         struct tty_struct *oldtty = info->port.tty;
4782         u32 speed = info->params.data_rate;
4783
4784         info->params.data_rate = 921600;
4785         info->port.tty = NULL;
4786
4787         spin_lock_irqsave(&info->lock, flags);
4788         async_mode(info);
4789         slgt_irq_on(info, IRQ_TXIDLE);
4790
4791         /* enable transmitter */
4792         wr_reg16(info, TCR,
4793                 (unsigned short)(rd_reg16(info, TCR) | BIT1));
4794
4795         /* write one byte and wait for tx idle */
4796         wr_reg16(info, TDR, 0);
4797
4798         /* assume failure */
4799         info->init_error = DiagStatus_IrqFailure;
4800         info->irq_occurred = false;
4801
4802         spin_unlock_irqrestore(&info->lock, flags);
4803
4804         timeout=100;
4805         while(timeout-- && !info->irq_occurred)
4806                 msleep_interruptible(10);
4807
4808         spin_lock_irqsave(&info->lock,flags);
4809         reset_port(info);
4810         spin_unlock_irqrestore(&info->lock,flags);
4811
4812         info->params.data_rate = speed;
4813         info->port.tty = oldtty;
4814
4815         info->init_error = info->irq_occurred ? 0 : DiagStatus_IrqFailure;
4816         return info->irq_occurred ? 0 : -ENODEV;
4817 }
4818
4819 static int loopback_test_rx(struct slgt_info *info)
4820 {
4821         unsigned char *src, *dest;
4822         int count;
4823
4824         if (desc_complete(info->rbufs[0])) {
4825                 count = desc_count(info->rbufs[0]);
4826                 src   = info->rbufs[0].buf;
4827                 dest  = info->tmp_rbuf;
4828
4829                 for( ; count ; count-=2, src+=2) {
4830                         /* src=data byte (src+1)=status byte */
4831                         if (!(*(src+1) & (BIT9 + BIT8))) {
4832                                 *dest = *src;
4833                                 dest++;
4834                                 info->tmp_rbuf_count++;
4835                         }
4836                 }
4837                 DBGDATA(info, info->tmp_rbuf, info->tmp_rbuf_count, "rx");
4838                 return 1;
4839         }
4840         return 0;
4841 }
4842
4843 static int loopback_test(struct slgt_info *info)
4844 {
4845 #define TESTFRAMESIZE 20
4846
4847         unsigned long timeout;
4848         u16 count = TESTFRAMESIZE;
4849         unsigned char buf[TESTFRAMESIZE];
4850         int rc = -ENODEV;
4851         unsigned long flags;
4852
4853         struct tty_struct *oldtty = info->port.tty;
4854         MGSL_PARAMS params;
4855
4856         memcpy(&params, &info->params, sizeof(params));
4857
4858         info->params.mode = MGSL_MODE_ASYNC;
4859         info->params.data_rate = 921600;
4860         info->params.loopback = 1;
4861         info->port.tty = NULL;
4862
4863         /* build and send transmit frame */
4864         for (count = 0; count < TESTFRAMESIZE; ++count)
4865                 buf[count] = (unsigned char)count;
4866
4867         info->tmp_rbuf_count = 0;
4868         memset(info->tmp_rbuf, 0, TESTFRAMESIZE);
4869
4870         /* program hardware for HDLC and enabled receiver */
4871         spin_lock_irqsave(&info->lock,flags);
4872         async_mode(info);
4873         rx_start(info);
4874         info->tx_count = count;
4875         tx_load(info, buf, count);
4876         tx_start(info);
4877         spin_unlock_irqrestore(&info->lock, flags);
4878
4879         /* wait for receive complete */
4880         for (timeout = 100; timeout; --timeout) {
4881                 msleep_interruptible(10);
4882                 if (loopback_test_rx(info)) {
4883                         rc = 0;
4884                         break;
4885                 }
4886         }
4887
4888         /* verify received frame length and contents */
4889         if (!rc && (info->tmp_rbuf_count != count ||
4890                   memcmp(buf, info->tmp_rbuf, count))) {
4891                 rc = -ENODEV;
4892         }
4893
4894         spin_lock_irqsave(&info->lock,flags);
4895         reset_adapter(info);
4896         spin_unlock_irqrestore(&info->lock,flags);
4897
4898         memcpy(&info->params, &params, sizeof(info->params));
4899         info->port.tty = oldtty;
4900
4901         info->init_error = rc ? DiagStatus_DmaFailure : 0;
4902         return rc;
4903 }
4904
4905 static int adapter_test(struct slgt_info *info)
4906 {
4907         DBGINFO(("testing %s\n", info->device_name));
4908         if (register_test(info) < 0) {
4909                 printk("register test failure %s addr=%08X\n",
4910                         info->device_name, info->phys_reg_addr);
4911         } else if (irq_test(info) < 0) {
4912                 printk("IRQ test failure %s IRQ=%d\n",
4913                         info->device_name, info->irq_level);
4914         } else if (loopback_test(info) < 0) {
4915                 printk("loopback test failure %s\n", info->device_name);
4916         }
4917         return info->init_error;
4918 }
4919
4920 /*
4921  * transmit timeout handler
4922  */
4923 static void tx_timeout(unsigned long context)
4924 {
4925         struct slgt_info *info = (struct slgt_info*)context;
4926         unsigned long flags;
4927
4928         DBGINFO(("%s tx_timeout\n", info->device_name));
4929         if(info->tx_active && info->params.mode == MGSL_MODE_HDLC) {
4930                 info->icount.txtimeout++;
4931         }
4932         spin_lock_irqsave(&info->lock,flags);
4933         info->tx_active = false;
4934         info->tx_count = 0;
4935         spin_unlock_irqrestore(&info->lock,flags);
4936
4937 #if SYNCLINK_GENERIC_HDLC
4938         if (info->netcount)
4939                 hdlcdev_tx_done(info);
4940         else
4941 #endif
4942                 bh_transmit(info);
4943 }
4944
4945 /*
4946  * receive buffer polling timer
4947  */
4948 static void rx_timeout(unsigned long context)
4949 {
4950         struct slgt_info *info = (struct slgt_info*)context;
4951         unsigned long flags;
4952
4953         DBGINFO(("%s rx_timeout\n", info->device_name));
4954         spin_lock_irqsave(&info->lock, flags);
4955         info->pending_bh |= BH_RECEIVE;
4956         spin_unlock_irqrestore(&info->lock, flags);
4957         bh_handler(&info->task);
4958 }
4959