drivers/char/pcmcia/synclink_cs.c

   1 /*
   2  * linux/drivers/char/pcmcia/synclink_cs.c
   3  *
   4  * $Id: synclink_cs.c,v 4.34 2005/09/08 13:20:54 paulkf Exp $
   5  *
   6  * Device driver for Microgate SyncLink PC Card
   7  * multiprotocol serial adapter.
   8  *
   9  * written by Paul Fulghum for Microgate Corporation
  10  * paulkf@microgate.com
  11  *
  12  * Microgate and SyncLink are trademarks of Microgate Corporation
  13  *
  14  * This code is released under the GNU General Public License (GPL)
  15  *
  16  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  17  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  18  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  19  * DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
  20  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  21  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  22  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  24  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  25  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  26  * OF THE POSSIBILITY OF SUCH DAMAGE.
  27  */
  28
  29 #define VERSION(ver,rel,seq) (((ver)<<16) | ((rel)<<8) | (seq))
  30 #if defined(__i386__)
  31 #  define BREAKPOINT() asm("   int $3");
  32 #else
  33 #  define BREAKPOINT() { }
  34 #endif
  35
  36 #define MAX_DEVICE_COUNT 4
  37
  38 #include <linux/module.h>
  39 #include <linux/errno.h>
  40 #include <linux/signal.h>
  41 #include <linux/sched.h>
  42 #include <linux/timer.h>
  43 #include <linux/time.h>
  44 #include <linux/interrupt.h>
  45 #include <linux/tty.h>
  46 #include <linux/tty_flip.h>
  47 #include <linux/serial.h>
  48 #include <linux/major.h>
  49 #include <linux/string.h>
  50 #include <linux/fcntl.h>
  51 #include <linux/ptrace.h>
  52 #include <linux/ioport.h>
  53 #include <linux/mm.h>
  54 #include <linux/seq_file.h>
  55 #include <linux/slab.h>
  56 #include <linux/netdevice.h>
  57 #include <linux/vmalloc.h>
  58 #include <linux/init.h>
  59 #include <linux/delay.h>
  60 #include <linux/ioctl.h>
  61 #include <linux/synclink.h>
  62
  63 #include <asm/system.h>
  64 #include <asm/io.h>
  65 #include <asm/irq.h>
  66 #include <asm/dma.h>
  67 #include <linux/bitops.h>
  68 #include <asm/types.h>
  69 #include <linux/termios.h>
  70 #include <linux/workqueue.h>
  71 #include <linux/hdlc.h>
  72
  73 #include <pcmcia/cs.h>
  74 #include <pcmcia/cistpl.h>
  75 #include <pcmcia/cisreg.h>
  76 #include <pcmcia/ds.h>
  77
  78 #if defined(CONFIG_HDLC) || (defined(CONFIG_HDLC_MODULE) && defined(CONFIG_SYNCLINK_CS_MODULE))
  79 #define SYNCLINK_GENERIC_HDLC 1
  80 #else
  81 #define SYNCLINK_GENERIC_HDLC 0
  82 #endif
  83
  84 #define GET_USER(error,value,addr) error = get_user(value,addr)
  85 #define COPY_FROM_USER(error,dest,src,size) error = copy_from_user(dest,src,size) ? -EFAULT : 0
  86 #define PUT_USER(error,value,addr) error = put_user(value,addr)
  87 #define COPY_TO_USER(error,dest,src,size) error = copy_to_user(dest,src,size) ? -EFAULT : 0
  88
  89 #include <asm/uaccess.h>
  90
  91 static MGSL_PARAMS default_params = {
  92         MGSL_MODE_HDLC,                 /* unsigned long mode */
  93         0,                              /* unsigned char loopback; */
  94         HDLC_FLAG_UNDERRUN_ABORT15,     /* unsigned short flags; */
  95         HDLC_ENCODING_NRZI_SPACE,       /* unsigned char encoding; */
  96         0,                              /* unsigned long clock_speed; */
  97         0xff,                           /* unsigned char addr_filter; */
  98         HDLC_CRC_16_CCITT,              /* unsigned short crc_type; */
  99         HDLC_PREAMBLE_LENGTH_8BITS,     /* unsigned char preamble_length; */
 100         HDLC_PREAMBLE_PATTERN_NONE,     /* unsigned char preamble; */
 101         9600,                           /* unsigned long data_rate; */
 102         8,                              /* unsigned char data_bits; */
 103         1,                              /* unsigned char stop_bits; */
 104         ASYNC_PARITY_NONE               /* unsigned char parity; */
 105 };
 106
 107 typedef struct
 108 {
 109         int count;
 110         unsigned char status;
 111         char data[1];
 112 } RXBUF;
 113
 114 /* The queue of BH actions to be performed */
 115
 116 #define BH_RECEIVE  1
 117 #define BH_TRANSMIT 2
 118 #define BH_STATUS   4
 119
 120 #define IO_PIN_SHUTDOWN_LIMIT 100
 121
 122 #define RELEVANT_IFLAG(iflag) (iflag & (IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK))
 123
 124 struct _input_signal_events {
 125         int     ri_up;
 126         int     ri_down;
 127         int     dsr_up;
 128         int     dsr_down;
 129         int     dcd_up;
 130         int     dcd_down;
 131         int     cts_up;
 132         int     cts_down;
 133 };
 134
 135
 136 /*
 137  * Device instance data structure
 138  */
 139
 140 typedef struct _mgslpc_info {
 141         struct tty_port         port;
 142         void *if_ptr;   /* General purpose pointer (used by SPPP) */
 143         int                     magic;
 144         int                     line;
 145
 146         struct mgsl_icount      icount;
 147
 148         int                     timeout;
 149         int                     x_char;         /* xon/xoff character */
 150         unsigned char           read_status_mask;
 151         unsigned char           ignore_status_mask;
 152
 153         unsigned char *tx_buf;
 154         int            tx_put;
 155         int            tx_get;
 156         int            tx_count;
 157
 158         /* circular list of fixed length rx buffers */
 159
 160         unsigned char  *rx_buf;        /* memory allocated for all rx buffers */
 161         int            rx_buf_total_size; /* size of memory allocated for rx buffers */
 162         int            rx_put;         /* index of next empty rx buffer */
 163         int            rx_get;         /* index of next full rx buffer */
 164         int            rx_buf_size;    /* size in bytes of single rx buffer */
 165         int            rx_buf_count;   /* total number of rx buffers */
 166         int            rx_frame_count; /* number of full rx buffers */
 167
 168         wait_queue_head_t       status_event_wait_q;
 169         wait_queue_head_t       event_wait_q;
 170         struct timer_list       tx_timer;       /* HDLC transmit timeout timer */
 171         struct _mgslpc_info     *next_device;   /* device list link */
 172
 173         unsigned short imra_value;
 174         unsigned short imrb_value;
 175         unsigned char  pim_value;
 176
 177         spinlock_t lock;
 178         struct work_struct task;                /* task structure for scheduling bh */
 179
 180         u32 max_frame_size;
 181
 182         u32 pending_bh;
 183
 184         bool bh_running;
 185         bool bh_requested;
 186
 187         int dcd_chkcount; /* check counts to prevent */
 188         int cts_chkcount; /* too many IRQs if a signal */
 189         int dsr_chkcount; /* is floating */
 190         int ri_chkcount;
 191
 192         bool rx_enabled;
 193         bool rx_overflow;
 194
 195         bool tx_enabled;
 196         bool tx_active;
 197         bool tx_aborting;
 198         u32 idle_mode;
 199
 200         int if_mode; /* serial interface selection (RS-232, v.35 etc) */
 201
 202         char device_name[25];           /* device instance name */
 203
 204         unsigned int io_base;   /* base I/O address of adapter */
 205         unsigned int irq_level;
 206
 207         MGSL_PARAMS params;             /* communications parameters */
 208
 209         unsigned char serial_signals;   /* current serial signal states */
 210
 211         bool irq_occurred;              /* for diagnostics use */
 212         char testing_irq;
 213         unsigned int init_error;        /* startup error (DIAGS)        */
 214
 215         char flag_buf[MAX_ASYNC_BUFFER_SIZE];
 216         bool drop_rts_on_tx_done;
 217
 218         struct  _input_signal_events    input_signal_events;
 219
 220         /* PCMCIA support */
 221         struct pcmcia_device    *p_dev;
 222         int                   stop;
 223
 224         /* SPPP/Cisco HDLC device parts */
 225         int netcount;
 226         spinlock_t netlock;
 227
 228 #if SYNCLINK_GENERIC_HDLC
 229         struct net_device *netdev;
 230 #endif
 231
 232 } MGSLPC_INFO;
 233
 234 #define MGSLPC_MAGIC 0x5402
 235
 236 /*
 237  * The size of the serial xmit buffer is 1 page, or 4096 bytes
 238  */
 239 #define TXBUFSIZE 4096
 240
 241
 242 #define CHA     0x00   /* channel A offset */
 243 #define CHB     0x40   /* channel B offset */
 244
 245 /*
 246  *  FIXME: PPC has PVR defined in asm/reg.h.  For now we just undef it.
 247  */
 248 #undef PVR
 249
 250 #define RXFIFO  0
 251 #define TXFIFO  0
 252 #define STAR    0x20
 253 #define CMDR    0x20
 254 #define RSTA    0x21
 255 #define PRE     0x21
 256 #define MODE    0x22
 257 #define TIMR    0x23
 258 #define XAD1    0x24
 259 #define XAD2    0x25
 260 #define RAH1    0x26
 261 #define RAH2    0x27
 262 #define DAFO    0x27
 263 #define RAL1    0x28
 264 #define RFC     0x28
 265 #define RHCR    0x29
 266 #define RAL2    0x29
 267 #define RBCL    0x2a
 268 #define XBCL    0x2a
 269 #define RBCH    0x2b
 270 #define XBCH    0x2b
 271 #define CCR0    0x2c
 272 #define CCR1    0x2d
 273 #define CCR2    0x2e
 274 #define CCR3    0x2f
 275 #define VSTR    0x34
 276 #define BGR     0x34
 277 #define RLCR    0x35
 278 #define AML     0x36
 279 #define AMH     0x37
 280 #define GIS     0x38
 281 #define IVA     0x38
 282 #define IPC     0x39
 283 #define ISR     0x3a
 284 #define IMR     0x3a
 285 #define PVR     0x3c
 286 #define PIS     0x3d
 287 #define PIM     0x3d
 288 #define PCR     0x3e
 289 #define CCR4    0x3f
 290
 291 // IMR/ISR
 292
 293 #define IRQ_BREAK_ON    BIT15   // rx break detected
 294 #define IRQ_DATAOVERRUN BIT14   // receive data overflow
 295 #define IRQ_ALLSENT     BIT13   // all sent
 296 #define IRQ_UNDERRUN    BIT12   // transmit data underrun
 297 #define IRQ_TIMER       BIT11   // timer interrupt
 298 #define IRQ_CTS         BIT10   // CTS status change
 299 #define IRQ_TXREPEAT    BIT9    // tx message repeat
 300 #define IRQ_TXFIFO      BIT8    // transmit pool ready
 301 #define IRQ_RXEOM       BIT7    // receive message end
 302 #define IRQ_EXITHUNT    BIT6    // receive frame start
 303 #define IRQ_RXTIME      BIT6    // rx char timeout
 304 #define IRQ_DCD         BIT2    // carrier detect status change
 305 #define IRQ_OVERRUN     BIT1    // receive frame overflow
 306 #define IRQ_RXFIFO      BIT0    // receive pool full
 307
 308 // STAR
 309
 310 #define XFW   BIT6              // transmit FIFO write enable
 311 #define CEC   BIT2              // command executing
 312 #define CTS   BIT1              // CTS state
 313
 314 #define PVR_DTR      BIT0
 315 #define PVR_DSR      BIT1
 316 #define PVR_RI       BIT2
 317 #define PVR_AUTOCTS  BIT3
 318 #define PVR_RS232    0x20   /* 0010b */
 319 #define PVR_V35      0xe0   /* 1110b */
 320 #define PVR_RS422    0x40   /* 0100b */
 321
 322 /* Register access functions */
 323
 324 #define write_reg(info, reg, val) outb((val),(info)->io_base + (reg))
 325 #define read_reg(info, reg) inb((info)->io_base + (reg))
 326
 327 #define read_reg16(info, reg) inw((info)->io_base + (reg))
 328 #define write_reg16(info, reg, val) outw((val), (info)->io_base + (reg))
 329
 330 #define set_reg_bits(info, reg, mask) \
 331     write_reg(info, (reg), \
 332                  (unsigned char) (read_reg(info, (reg)) | (mask)))
 333 #define clear_reg_bits(info, reg, mask) \
 334     write_reg(info, (reg), \
 335                  (unsigned char) (read_reg(info, (reg)) & ~(mask)))
 336 /*
 337  * interrupt enable/disable routines
 338  */
 339 static void irq_disable(MGSLPC_INFO *info, unsigned char channel, unsigned short mask)
 340 {
 341         if (channel == CHA) {
 342                 info->imra_value |= mask;
 343                 write_reg16(info, CHA + IMR, info->imra_value);
 344         } else {
 345                 info->imrb_value |= mask;
 346                 write_reg16(info, CHB + IMR, info->imrb_value);
 347         }
 348 }
 349 static void irq_enable(MGSLPC_INFO *info, unsigned char channel, unsigned short mask)
 350 {
 351         if (channel == CHA) {
 352                 info->imra_value &= ~mask;
 353                 write_reg16(info, CHA + IMR, info->imra_value);
 354         } else {
 355                 info->imrb_value &= ~mask;
 356                 write_reg16(info, CHB + IMR, info->imrb_value);
 357         }
 358 }
 359
 360 #define port_irq_disable(info, mask) \
 361   { info->pim_value |= (mask); write_reg(info, PIM, info->pim_value); }
 362
 363 #define port_irq_enable(info, mask) \
 364   { info->pim_value &= ~(mask); write_reg(info, PIM, info->pim_value); }
 365
 366 static void rx_start(MGSLPC_INFO *info);
 367 static void rx_stop(MGSLPC_INFO *info);
 368
 369 static void tx_start(MGSLPC_INFO *info, struct tty_struct *tty);
 370 static void tx_stop(MGSLPC_INFO *info);
 371 static void tx_set_idle(MGSLPC_INFO *info);
 372
 373 static void get_signals(MGSLPC_INFO *info);
 374 static void set_signals(MGSLPC_INFO *info);
 375
 376 static void reset_device(MGSLPC_INFO *info);
 377
 378 static void hdlc_mode(MGSLPC_INFO *info);
 379 static void async_mode(MGSLPC_INFO *info);
 380
 381 static void tx_timeout(unsigned long context);
 382
 383 static int carrier_raised(struct tty_port *port);
 384 static void dtr_rts(struct tty_port *port, int onoff);
 385
 386 #if SYNCLINK_GENERIC_HDLC
 387 #define dev_to_port(D) (dev_to_hdlc(D)->priv)
 388 static void hdlcdev_tx_done(MGSLPC_INFO *info);
 389 static void hdlcdev_rx(MGSLPC_INFO *info, char *buf, int size);
 390 static int  hdlcdev_init(MGSLPC_INFO *info);
 391 static void hdlcdev_exit(MGSLPC_INFO *info);
 392 #endif
 393
 394 static void trace_block(MGSLPC_INFO *info,const char* data, int count, int xmit);
 395
 396 static bool register_test(MGSLPC_INFO *info);
 397 static bool irq_test(MGSLPC_INFO *info);
 398 static int adapter_test(MGSLPC_INFO *info);
 399
 400 static int claim_resources(MGSLPC_INFO *info);
 401 static void release_resources(MGSLPC_INFO *info);
 402 static void mgslpc_add_device(MGSLPC_INFO *info);
 403 static void mgslpc_remove_device(MGSLPC_INFO *info);
 404
 405 static bool rx_get_frame(MGSLPC_INFO *info, struct tty_struct *tty);
 406 static void rx_reset_buffers(MGSLPC_INFO *info);
 407 static int  rx_alloc_buffers(MGSLPC_INFO *info);
 408 static void rx_free_buffers(MGSLPC_INFO *info);
 409
 410 static irqreturn_t mgslpc_isr(int irq, void *dev_id);
 411
 412 /*
 413  * Bottom half interrupt handlers
 414  */
 415 static void bh_handler(struct work_struct *work);
 416 static void bh_transmit(MGSLPC_INFO *info, struct tty_struct *tty);
 417 static void bh_status(MGSLPC_INFO *info);
 418
 419 /*
 420  * ioctl handlers
 421  */
 422 static int tiocmget(struct tty_struct *tty, struct file *file);
 423 static int tiocmset(struct tty_struct *tty, struct file *file,
 424                     unsigned int set, unsigned int clear);
 425 static int get_stats(MGSLPC_INFO *info, struct mgsl_icount __user *user_icount);
 426 static int get_params(MGSLPC_INFO *info, MGSL_PARAMS __user *user_params);
 427 static int set_params(MGSLPC_INFO *info, MGSL_PARAMS __user *new_params, struct tty_struct *tty);
 428 static int get_txidle(MGSLPC_INFO *info, int __user *idle_mode);
 429 static int set_txidle(MGSLPC_INFO *info, int idle_mode);
 430 static int set_txenable(MGSLPC_INFO *info, int enable, struct tty_struct *tty);
 431 static int tx_abort(MGSLPC_INFO *info);
 432 static int set_rxenable(MGSLPC_INFO *info, int enable);
 433 static int wait_events(MGSLPC_INFO *info, int __user *mask);
 434
 435 static MGSLPC_INFO *mgslpc_device_list = NULL;
 436 static int mgslpc_device_count = 0;
 437
 438 /*
 439  * Set this param to non-zero to load eax with the
 440  * .text section address and breakpoint on module load.
 441  * This is useful for use with gdb and add-symbol-file command.
 442  */
 443 static int break_on_load=0;
 444
 445 /*
 446  * Driver major number, defaults to zero to get auto
 447  * assigned major number. May be forced as module parameter.
 448  */
 449 static int ttymajor=0;
 450
 451 static int debug_level = 0;
 452 static int maxframe[MAX_DEVICE_COUNT] = {0,};
 453
 454 module_param(break_on_load, bool, 0);
 455 module_param(ttymajor, int, 0);
 456 module_param(debug_level, int, 0);
 457 module_param_array(maxframe, int, NULL, 0);
 458
 459 MODULE_LICENSE("GPL");
 460
 461 static char *driver_name = "SyncLink PC Card driver";
 462 static char *driver_version = "$Revision: 4.34 $";
 463
 464 static struct tty_driver *serial_driver;
 465
 466 /* number of characters left in xmit buffer before we ask for more */
 467 #define WAKEUP_CHARS 256
 468
 469 static void mgslpc_change_params(MGSLPC_INFO *info, struct tty_struct *tty);
 470 static void mgslpc_wait_until_sent(struct tty_struct *tty, int timeout);
 471
 472 /* PCMCIA prototypes */
 473
 474 static int mgslpc_config(struct pcmcia_device *link);
 475 static void mgslpc_release(u_long arg);
 476 static void mgslpc_detach(struct pcmcia_device *p_dev);
 477
 478 /*
 479  * 1st function defined in .text section. Calling this function in
 480  * init_module() followed by a breakpoint allows a remote debugger
 481  * (gdb) to get the .text address for the add-symbol-file command.
 482  * This allows remote debugging of dynamically loadable modules.
 483  */
 484 static void* mgslpc_get_text_ptr(void)
 485 {
 486         return mgslpc_get_text_ptr;
 487 }
 488
 489 /**
 490  * line discipline callback wrappers
 491  *
 492  * The wrappers maintain line discipline references
 493  * while calling into the line discipline.
 494  *
 495  * ldisc_receive_buf  - pass receive data to line discipline
 496  */
 497
 498 static void ldisc_receive_buf(struct tty_struct *tty,
 499                               const __u8 *data, char *flags, int count)
 500 {
 501         struct tty_ldisc *ld;
 502         if (!tty)
 503                 return;
 504         ld = tty_ldisc_ref(tty);
 505         if (ld) {
 506                 if (ld->ops->receive_buf)
 507                         ld->ops->receive_buf(tty, data, flags, count);
 508                 tty_ldisc_deref(ld);
 509         }
 510 }
 511
 512 static const struct tty_port_operations mgslpc_port_ops = {
 513         .carrier_raised = carrier_raised,
 514         .dtr_rts = dtr_rts
 515 };
 516
 517 static int mgslpc_probe(struct pcmcia_device *link)
 518 {
 519     MGSLPC_INFO *info;
 520     int ret;
 521
 522     if (debug_level >= DEBUG_LEVEL_INFO)
 523             printk("mgslpc_attach\n");
 524
 525     info = kzalloc(sizeof(MGSLPC_INFO), GFP_KERNEL);
 526     if (!info) {
 527             printk("Error can't allocate device instance data\n");
 528             return -ENOMEM;
 529     }
 530
 531     info->magic = MGSLPC_MAGIC;
 532     tty_port_init(&info->port);
 533     info->port.ops = &mgslpc_port_ops;
 534     INIT_WORK(&info->task, bh_handler);
 535     info->max_frame_size = 4096;
 536     info->port.close_delay = 5*HZ/10;
 537     info->port.closing_wait = 30*HZ;
 538     init_waitqueue_head(&info->status_event_wait_q);
 539     init_waitqueue_head(&info->event_wait_q);
 540     spin_lock_init(&info->lock);
 541     spin_lock_init(&info->netlock);
 542     memcpy(&info->params,&default_params,sizeof(MGSL_PARAMS));
 543     info->idle_mode = HDLC_TXIDLE_FLAGS;
 544     info->imra_value = 0xffff;
 545     info->imrb_value = 0xffff;
 546     info->pim_value = 0xff;
 547
 548     info->p_dev = link;
 549     link->priv = info;
 550
 551     /* Initialize the struct pcmcia_device structure */
 552
 553     link->conf.Attributes = 0;
 554     link->conf.IntType = INT_MEMORY_AND_IO;
 555
 556     ret = mgslpc_config(link);
 557     if (ret)
 558             return ret;
 559
 560     mgslpc_add_device(info);
 561
 562     return 0;
 563 }
 564
 565 /* Card has been inserted.
 566  */
 567
 568 static int mgslpc_ioprobe(struct pcmcia_device *p_dev,
 569                           cistpl_cftable_entry_t *cfg,
 570                           cistpl_cftable_entry_t *dflt,
 571                           unsigned int vcc,
 572                           void *priv_data)
 573 {
 574         if (!cfg->io.nwin)
 575                 return -ENODEV;
 576
 577         p_dev->resource[0]->start = cfg->io.win[0].base;
 578         p_dev->resource[0]->end = cfg->io.win[0].len;
 579         p_dev->resource[0]->flags |= pcmcia_io_cfg_data_width(cfg->io.flags);
 580         p_dev->io_lines = cfg->io.flags & CISTPL_IO_LINES_MASK;
 581
 582         return pcmcia_request_io(p_dev);
 583 }
 584
 585 static int mgslpc_config(struct pcmcia_device *link)
 586 {
 587     MGSLPC_INFO *info = link->priv;
 588     int ret;
 589
 590     if (debug_level >= DEBUG_LEVEL_INFO)
 591             printk("mgslpc_config(0x%p)\n", link);
 592
 593     ret = pcmcia_loop_config(link, mgslpc_ioprobe, NULL);
 594     if (ret != 0)
 595             goto failed;
 596
 597     link->conf.Attributes = CONF_ENABLE_IRQ;
 598     link->conf.IntType = INT_MEMORY_AND_IO;
 599     link->conf.ConfigIndex = 8;
 600     link->conf.Present = PRESENT_OPTION;
 601
 602     ret = pcmcia_request_irq(link, mgslpc_isr);
 603     if (ret)
 604             goto failed;
 605     ret = pcmcia_request_configuration(link, &link->conf);
 606     if (ret)
 607             goto failed;
 608
 609     info->io_base = link->resource[0]->start;
 610     info->irq_level = link->irq;
 611
 612     dev_info(&link->dev, "index 0x%02x:",
 613             link->conf.ConfigIndex);
 614     if (link->conf.Attributes & CONF_ENABLE_IRQ)
 615             printk(", irq %d", link->irq);
 616     if (link->resource[0])
 617             printk(", io %pR", link->resource[0]);
 618     printk("\n");
 619     return 0;
 620
 621 failed:
 622     mgslpc_release((u_long)link);
 623     return -ENODEV;
 624 }
 625
 626 /* Card has been removed.
 627  * Unregister device and release PCMCIA configuration.
 628  * If device is open, postpone until it is closed.
 629  */
 630 static void mgslpc_release(u_long arg)
 631 {
 632         struct pcmcia_device *link = (struct pcmcia_device *)arg;
 633
 634         if (debug_level >= DEBUG_LEVEL_INFO)
 635                 printk("mgslpc_release(0x%p)\n", link);
 636
 637         pcmcia_disable_device(link);
 638 }
 639
 640 static void mgslpc_detach(struct pcmcia_device *link)
 641 {
 642         if (debug_level >= DEBUG_LEVEL_INFO)
 643                 printk("mgslpc_detach(0x%p)\n", link);
 644
 645         ((MGSLPC_INFO *)link->priv)->stop = 1;
 646         mgslpc_release((u_long)link);
 647
 648         mgslpc_remove_device((MGSLPC_INFO *)link->priv);
 649 }
 650
 651 static int mgslpc_suspend(struct pcmcia_device *link)
 652 {
 653         MGSLPC_INFO *info = link->priv;
 654
 655         info->stop = 1;
 656
 657         return 0;
 658 }
 659
 660 static int mgslpc_resume(struct pcmcia_device *link)
 661 {
 662         MGSLPC_INFO *info = link->priv;
 663
 664         info->stop = 0;
 665
 666         return 0;
 667 }
 668
 669
 670 static inline bool mgslpc_paranoia_check(MGSLPC_INFO *info,
 671                                         char *name, const char *routine)
 672 {
 673 #ifdef MGSLPC_PARANOIA_CHECK
 674         static const char *badmagic =
 675                 "Warning: bad magic number for mgsl struct (%s) in %s\n";
 676         static const char *badinfo =
 677                 "Warning: null mgslpc_info for (%s) in %s\n";
 678
 679         if (!info) {
 680                 printk(badinfo, name, routine);
 681                 return true;
 682         }
 683         if (info->magic != MGSLPC_MAGIC) {
 684                 printk(badmagic, name, routine);
 685                 return true;
 686         }
 687 #else
 688         if (!info)
 689                 return true;
 690 #endif
 691         return false;
 692 }
 693
 694
 695 #define CMD_RXFIFO      BIT7    // release current rx FIFO
 696 #define CMD_RXRESET     BIT6    // receiver reset
 697 #define CMD_RXFIFO_READ BIT5
 698 #define CMD_START_TIMER BIT4
 699 #define CMD_TXFIFO      BIT3    // release current tx FIFO
 700 #define CMD_TXEOM       BIT1    // transmit end message
 701 #define CMD_TXRESET     BIT0    // transmit reset
 702
 703 static bool wait_command_complete(MGSLPC_INFO *info, unsigned char channel)
 704 {
 705         int i = 0;
 706         /* wait for command completion */
 707         while (read_reg(info, (unsigned char)(channel+STAR)) & BIT2) {
 708                 udelay(1);
 709                 if (i++ == 1000)
 710                         return false;
 711         }
 712         return true;
 713 }
 714
 715 static void issue_command(MGSLPC_INFO *info, unsigned char channel, unsigned char cmd)
 716 {
 717         wait_command_complete(info, channel);
 718         write_reg(info, (unsigned char) (channel + CMDR), cmd);
 719 }
 720
 721 static void tx_pause(struct tty_struct *tty)
 722 {
 723         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
 724         unsigned long flags;
 725
 726         if (mgslpc_paranoia_check(info, tty->name, "tx_pause"))
 727                 return;
 728         if (debug_level >= DEBUG_LEVEL_INFO)
 729                 printk("tx_pause(%s)\n",info->device_name);
 730
 731         spin_lock_irqsave(&info->lock,flags);
 732         if (info->tx_enabled)
 733                 tx_stop(info);
 734         spin_unlock_irqrestore(&info->lock,flags);
 735 }
 736
 737 static void tx_release(struct tty_struct *tty)
 738 {
 739         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
 740         unsigned long flags;
 741
 742         if (mgslpc_paranoia_check(info, tty->name, "tx_release"))
 743                 return;
 744         if (debug_level >= DEBUG_LEVEL_INFO)
 745                 printk("tx_release(%s)\n",info->device_name);
 746
 747         spin_lock_irqsave(&info->lock,flags);
 748         if (!info->tx_enabled)
 749                 tx_start(info, tty);
 750         spin_unlock_irqrestore(&info->lock,flags);
 751 }
 752
 753 /* Return next bottom half action to perform.
 754  * or 0 if nothing to do.
 755  */
 756 static int bh_action(MGSLPC_INFO *info)
 757 {
 758         unsigned long flags;
 759         int rc = 0;
 760
 761         spin_lock_irqsave(&info->lock,flags);
 762
 763         if (info->pending_bh & BH_RECEIVE) {
 764                 info->pending_bh &= ~BH_RECEIVE;
 765                 rc = BH_RECEIVE;
 766         } else if (info->pending_bh & BH_TRANSMIT) {
 767                 info->pending_bh &= ~BH_TRANSMIT;
 768                 rc = BH_TRANSMIT;
 769         } else if (info->pending_bh & BH_STATUS) {
 770                 info->pending_bh &= ~BH_STATUS;
 771                 rc = BH_STATUS;
 772         }
 773
 774         if (!rc) {
 775                 /* Mark BH routine as complete */
 776                 info->bh_running = false;
 777                 info->bh_requested = false;
 778         }
 779
 780         spin_unlock_irqrestore(&info->lock,flags);
 781
 782         return rc;
 783 }
 784
 785 static void bh_handler(struct work_struct *work)
 786 {
 787         MGSLPC_INFO *info = container_of(work, MGSLPC_INFO, task);
 788         struct tty_struct *tty;
 789         int action;
 790
 791         if (!info)
 792                 return;
 793
 794         if (debug_level >= DEBUG_LEVEL_BH)
 795                 printk( "%s(%d):bh_handler(%s) entry\n",
 796                         __FILE__,__LINE__,info->device_name);
 797
 798         info->bh_running = true;
 799         tty = tty_port_tty_get(&info->port);
 800
 801         while((action = bh_action(info)) != 0) {
 802
 803                 /* Process work item */
 804                 if ( debug_level >= DEBUG_LEVEL_BH )
 805                         printk( "%s(%d):bh_handler() work item action=%d\n",
 806                                 __FILE__,__LINE__,action);
 807
 808                 switch (action) {
 809
 810                 case BH_RECEIVE:
 811                         while(rx_get_frame(info, tty));
 812                         break;
 813                 case BH_TRANSMIT:
 814                         bh_transmit(info, tty);
 815                         break;
 816                 case BH_STATUS:
 817                         bh_status(info);
 818                         break;
 819                 default:
 820                         /* unknown work item ID */
 821                         printk("Unknown work item ID=%08X!\n", action);
 822                         break;
 823                 }
 824         }
 825
 826         tty_kref_put(tty);
 827         if (debug_level >= DEBUG_LEVEL_BH)
 828                 printk( "%s(%d):bh_handler(%s) exit\n",
 829                         __FILE__,__LINE__,info->device_name);
 830 }
 831
 832 static void bh_transmit(MGSLPC_INFO *info, struct tty_struct *tty)
 833 {
 834         if (debug_level >= DEBUG_LEVEL_BH)
 835                 printk("bh_transmit() entry on %s\n", info->device_name);
 836
 837         if (tty)
 838                 tty_wakeup(tty);
 839 }
 840
 841 static void bh_status(MGSLPC_INFO *info)
 842 {
 843         info->ri_chkcount = 0;
 844         info->dsr_chkcount = 0;
 845         info->dcd_chkcount = 0;
 846         info->cts_chkcount = 0;
 847 }
 848
 849 /* eom: non-zero = end of frame */
 850 static void rx_ready_hdlc(MGSLPC_INFO *info, int eom)
 851 {
 852         unsigned char data[2];
 853         unsigned char fifo_count, read_count, i;
 854         RXBUF *buf = (RXBUF*)(info->rx_buf + (info->rx_put * info->rx_buf_size));
 855
 856         if (debug_level >= DEBUG_LEVEL_ISR)
 857                 printk("%s(%d):rx_ready_hdlc(eom=%d)\n",__FILE__,__LINE__,eom);
 858
 859         if (!info->rx_enabled)
 860                 return;
 861
 862         if (info->rx_frame_count >= info->rx_buf_count) {
 863                 /* no more free buffers */
 864                 issue_command(info, CHA, CMD_RXRESET);
 865                 info->pending_bh |= BH_RECEIVE;
 866                 info->rx_overflow = true;
 867                 info->icount.buf_overrun++;
 868                 return;
 869         }
 870
 871         if (eom) {
 872                 /* end of frame, get FIFO count from RBCL register */
 873                 if (!(fifo_count = (unsigned char)(read_reg(info, CHA+RBCL) & 0x1f)))
 874                         fifo_count = 32;
 875         } else
 876                 fifo_count = 32;
 877
 878         do {
 879                 if (fifo_count == 1) {
 880                         read_count = 1;
 881                         data[0] = read_reg(info, CHA + RXFIFO);
 882                 } else {
 883                         read_count = 2;
 884                         *((unsigned short *) data) = read_reg16(info, CHA + RXFIFO);
 885                 }
 886                 fifo_count -= read_count;
 887                 if (!fifo_count && eom)
 888                         buf->status = data[--read_count];
 889
 890                 for (i = 0; i < read_count; i++) {
 891                         if (buf->count >= info->max_frame_size) {
 892                                 /* frame too large, reset receiver and reset current buffer */
 893                                 issue_command(info, CHA, CMD_RXRESET);
 894                                 buf->count = 0;
 895                                 return;
 896                         }
 897                         *(buf->data + buf->count) = data[i];
 898                         buf->count++;
 899                 }
 900         } while (fifo_count);
 901
 902         if (eom) {
 903                 info->pending_bh |= BH_RECEIVE;
 904                 info->rx_frame_count++;
 905                 info->rx_put++;
 906                 if (info->rx_put >= info->rx_buf_count)
 907                         info->rx_put = 0;
 908         }
 909         issue_command(info, CHA, CMD_RXFIFO);
 910 }
 911
 912 static void rx_ready_async(MGSLPC_INFO *info, int tcd, struct tty_struct *tty)
 913 {
 914         unsigned char data, status, flag;
 915         int fifo_count;
 916         int work = 0;
 917         struct mgsl_icount *icount = &info->icount;
 918
 919         if (tcd) {
 920                 /* early termination, get FIFO count from RBCL register */
 921                 fifo_count = (unsigned char)(read_reg(info, CHA+RBCL) & 0x1f);
 922
 923                 /* Zero fifo count could mean 0 or 32 bytes available.
 924                  * If BIT5 of STAR is set then at least 1 byte is available.
 925                  */
 926                 if (!fifo_count && (read_reg(info,CHA+STAR) & BIT5))
 927                         fifo_count = 32;
 928         } else
 929                 fifo_count = 32;
 930
 931         tty_buffer_request_room(tty, fifo_count);
 932         /* Flush received async data to receive data buffer. */
 933         while (fifo_count) {
 934                 data   = read_reg(info, CHA + RXFIFO);
 935                 status = read_reg(info, CHA + RXFIFO);
 936                 fifo_count -= 2;
 937
 938                 icount->rx++;
 939                 flag = TTY_NORMAL;
 940
 941                 // if no frameing/crc error then save data
 942                 // BIT7:parity error
 943                 // BIT6:framing error
 944
 945                 if (status & (BIT7 + BIT6)) {
 946                         if (status & BIT7)
 947                                 icount->parity++;
 948                         else
 949                                 icount->frame++;
 950
 951                         /* discard char if tty control flags say so */
 952                         if (status & info->ignore_status_mask)
 953                                 continue;
 954
 955                         status &= info->read_status_mask;
 956
 957                         if (status & BIT7)
 958                                 flag = TTY_PARITY;
 959                         else if (status & BIT6)
 960                                 flag = TTY_FRAME;
 961                 }
 962                 work += tty_insert_flip_char(tty, data, flag);
 963         }
 964         issue_command(info, CHA, CMD_RXFIFO);
 965
 966         if (debug_level >= DEBUG_LEVEL_ISR) {
 967                 printk("%s(%d):rx_ready_async",
 968                         __FILE__,__LINE__);
 969                 printk("%s(%d):rx=%d brk=%d parity=%d frame=%d overrun=%d\n",
 970                         __FILE__,__LINE__,icount->rx,icount->brk,
 971                         icount->parity,icount->frame,icount->overrun);
 972         }
 973
 974         if (work)
 975                 tty_flip_buffer_push(tty);
 976 }
 977
 978
 979 static void tx_done(MGSLPC_INFO *info, struct tty_struct *tty)
 980 {
 981         if (!info->tx_active)
 982                 return;
 983
 984         info->tx_active = false;
 985         info->tx_aborting = false;
 986
 987         if (info->params.mode == MGSL_MODE_ASYNC)
 988                 return;
 989
 990         info->tx_count = info->tx_put = info->tx_get = 0;
 991         del_timer(&info->tx_timer);
 992
 993         if (info->drop_rts_on_tx_done) {
 994                 get_signals(info);
 995                 if (info->serial_signals & SerialSignal_RTS) {
 996                         info->serial_signals &= ~SerialSignal_RTS;
 997                         set_signals(info);
 998                 }
 999                 info->drop_rts_on_tx_done = false;
1000         }
1001
1002 #if SYNCLINK_GENERIC_HDLC
1003         if (info->netcount)
1004                 hdlcdev_tx_done(info);
1005         else
1006 #endif
1007         {
1008                 if (tty->stopped || tty->hw_stopped) {
1009                         tx_stop(info);
1010                         return;
1011                 }
1012                 info->pending_bh |= BH_TRANSMIT;
1013         }
1014 }
1015
1016 static void tx_ready(MGSLPC_INFO *info, struct tty_struct *tty)
1017 {
1018         unsigned char fifo_count = 32;
1019         int c;
1020
1021         if (debug_level >= DEBUG_LEVEL_ISR)
1022                 printk("%s(%d):tx_ready(%s)\n", __FILE__,__LINE__,info->device_name);
1023
1024         if (info->params.mode == MGSL_MODE_HDLC) {
1025                 if (!info->tx_active)
1026                         return;
1027         } else {
1028                 if (tty->stopped || tty->hw_stopped) {
1029                         tx_stop(info);
1030                         return;
1031                 }
1032                 if (!info->tx_count)
1033                         info->tx_active = false;
1034         }
1035
1036         if (!info->tx_count)
1037                 return;
1038
1039         while (info->tx_count && fifo_count) {
1040                 c = min(2, min_t(int, fifo_count, min(info->tx_count, TXBUFSIZE - info->tx_get)));
1041
1042                 if (c == 1) {
1043                         write_reg(info, CHA + TXFIFO, *(info->tx_buf + info->tx_get));
1044                 } else {
1045                         write_reg16(info, CHA + TXFIFO,
1046                                           *((unsigned short*)(info->tx_buf + info->tx_get)));
1047                 }
1048                 info->tx_count -= c;
1049                 info->tx_get = (info->tx_get + c) & (TXBUFSIZE - 1);
1050                 fifo_count -= c;
1051         }
1052
1053         if (info->params.mode == MGSL_MODE_ASYNC) {
1054                 if (info->tx_count < WAKEUP_CHARS)
1055                         info->pending_bh |= BH_TRANSMIT;
1056                 issue_command(info, CHA, CMD_TXFIFO);
1057         } else {
1058                 if (info->tx_count)
1059                         issue_command(info, CHA, CMD_TXFIFO);
1060                 else
1061                         issue_command(info, CHA, CMD_TXFIFO + CMD_TXEOM);
1062         }
1063 }
1064
1065 static void cts_change(MGSLPC_INFO *info, struct tty_struct *tty)
1066 {
1067         get_signals(info);
1068         if ((info->cts_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT)
1069                 irq_disable(info, CHB, IRQ_CTS);
1070         info->icount.cts++;
1071         if (info->serial_signals & SerialSignal_CTS)
1072                 info->input_signal_events.cts_up++;
1073         else
1074                 info->input_signal_events.cts_down++;
1075         wake_up_interruptible(&info->status_event_wait_q);
1076         wake_up_interruptible(&info->event_wait_q);
1077
1078         if (info->port.flags & ASYNC_CTS_FLOW) {
1079                 if (tty->hw_stopped) {
1080                         if (info->serial_signals & SerialSignal_CTS) {
1081                                 if (debug_level >= DEBUG_LEVEL_ISR)
1082                                         printk("CTS tx start...");
1083                                 if (tty)
1084                                         tty->hw_stopped = 0;
1085                                 tx_start(info, tty);
1086                                 info->pending_bh |= BH_TRANSMIT;
1087                                 return;
1088                         }
1089                 } else {
1090                         if (!(info->serial_signals & SerialSignal_CTS)) {
1091                                 if (debug_level >= DEBUG_LEVEL_ISR)
1092                                         printk("CTS tx stop...");
1093                                 if (tty)
1094                                         tty->hw_stopped = 1;
1095                                 tx_stop(info);
1096                         }
1097                 }
1098         }
1099         info->pending_bh |= BH_STATUS;
1100 }
1101
1102 static void dcd_change(MGSLPC_INFO *info, struct tty_struct *tty)
1103 {
1104         get_signals(info);
1105         if ((info->dcd_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT)
1106                 irq_disable(info, CHB, IRQ_DCD);
1107         info->icount.dcd++;
1108         if (info->serial_signals & SerialSignal_DCD) {
1109                 info->input_signal_events.dcd_up++;
1110         }
1111         else
1112                 info->input_signal_events.dcd_down++;
1113 #if SYNCLINK_GENERIC_HDLC
1114         if (info->netcount) {
1115                 if (info->serial_signals & SerialSignal_DCD)
1116                         netif_carrier_on(info->netdev);
1117                 else
1118                         netif_carrier_off(info->netdev);
1119         }
1120 #endif
1121         wake_up_interruptible(&info->status_event_wait_q);
1122         wake_up_interruptible(&info->event_wait_q);
1123
1124         if (info->port.flags & ASYNC_CHECK_CD) {
1125                 if (debug_level >= DEBUG_LEVEL_ISR)
1126                         printk("%s CD now %s...", info->device_name,
1127                                (info->serial_signals & SerialSignal_DCD) ? "on" : "off");
1128                 if (info->serial_signals & SerialSignal_DCD)
1129                         wake_up_interruptible(&info->port.open_wait);
1130                 else {
1131                         if (debug_level >= DEBUG_LEVEL_ISR)
1132                                 printk("doing serial hangup...");
1133                         if (tty)
1134                                 tty_hangup(tty);
1135                 }
1136         }
1137         info->pending_bh |= BH_STATUS;
1138 }
1139
1140 static void dsr_change(MGSLPC_INFO *info)
1141 {
1142         get_signals(info);
1143         if ((info->dsr_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT)
1144                 port_irq_disable(info, PVR_DSR);
1145         info->icount.dsr++;
1146         if (info->serial_signals & SerialSignal_DSR)
1147                 info->input_signal_events.dsr_up++;
1148         else
1149                 info->input_signal_events.dsr_down++;
1150         wake_up_interruptible(&info->status_event_wait_q);
1151         wake_up_interruptible(&info->event_wait_q);
1152         info->pending_bh |= BH_STATUS;
1153 }
1154
1155 static void ri_change(MGSLPC_INFO *info)
1156 {
1157         get_signals(info);
1158         if ((info->ri_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT)
1159                 port_irq_disable(info, PVR_RI);
1160         info->icount.rng++;
1161         if (info->serial_signals & SerialSignal_RI)
1162                 info->input_signal_events.ri_up++;
1163         else
1164                 info->input_signal_events.ri_down++;
1165         wake_up_interruptible(&info->status_event_wait_q);
1166         wake_up_interruptible(&info->event_wait_q);
1167         info->pending_bh |= BH_STATUS;
1168 }
1169
1170 /* Interrupt service routine entry point.
1171  *
1172  * Arguments:
1173  *
1174  * irq     interrupt number that caused interrupt
1175  * dev_id  device ID supplied during interrupt registration
1176  */
1177 static irqreturn_t mgslpc_isr(int dummy, void *dev_id)
1178 {
1179         MGSLPC_INFO *info = dev_id;
1180         struct tty_struct *tty;
1181         unsigned short isr;
1182         unsigned char gis, pis;
1183         int count=0;
1184
1185         if (debug_level >= DEBUG_LEVEL_ISR)
1186                 printk("mgslpc_isr(%d) entry.\n", info->irq_level);
1187
1188         if (!(info->p_dev->_locked))
1189                 return IRQ_HANDLED;
1190
1191         tty = tty_port_tty_get(&info->port);
1192
1193         spin_lock(&info->lock);
1194
1195         while ((gis = read_reg(info, CHA + GIS))) {
1196                 if (debug_level >= DEBUG_LEVEL_ISR)
1197                         printk("mgslpc_isr %s gis=%04X\n", info->device_name,gis);
1198
1199                 if ((gis & 0x70) || count > 1000) {
1200                         printk("synclink_cs:hardware failed or ejected\n");
1201                         break;
1202                 }
1203                 count++;
1204
1205                 if (gis & (BIT1 + BIT0)) {
1206                         isr = read_reg16(info, CHB + ISR);
1207                         if (isr & IRQ_DCD)
1208                                 dcd_change(info, tty);
1209                         if (isr & IRQ_CTS)
1210                                 cts_change(info, tty);
1211                 }
1212                 if (gis & (BIT3 + BIT2))
1213                 {
1214                         isr = read_reg16(info, CHA + ISR);
1215                         if (isr & IRQ_TIMER) {
1216                                 info->irq_occurred = true;
1217                                 irq_disable(info, CHA, IRQ_TIMER);
1218                         }
1219
1220                         /* receive IRQs */
1221                         if (isr & IRQ_EXITHUNT) {
1222                                 info->icount.exithunt++;
1223                                 wake_up_interruptible(&info->event_wait_q);
1224                         }
1225                         if (isr & IRQ_BREAK_ON) {
1226                                 info->icount.brk++;
1227                                 if (info->port.flags & ASYNC_SAK)
1228                                         do_SAK(tty);
1229                         }
1230                         if (isr & IRQ_RXTIME) {
1231                                 issue_command(info, CHA, CMD_RXFIFO_READ);
1232                         }
1233                         if (isr & (IRQ_RXEOM + IRQ_RXFIFO)) {
1234                                 if (info->params.mode == MGSL_MODE_HDLC)
1235                                         rx_ready_hdlc(info, isr & IRQ_RXEOM);
1236                                 else
1237                                         rx_ready_async(info, isr & IRQ_RXEOM, tty);
1238                         }
1239
1240                         /* transmit IRQs */
1241                         if (isr & IRQ_UNDERRUN) {
1242                                 if (info->tx_aborting)
1243                                         info->icount.txabort++;
1244                                 else
1245                                         info->icount.txunder++;
1246                                 tx_done(info, tty);
1247                         }
1248                         else if (isr & IRQ_ALLSENT) {
1249                                 info->icount.txok++;
1250                                 tx_done(info, tty);
1251                         }
1252                         else if (isr & IRQ_TXFIFO)
1253                                 tx_ready(info, tty);
1254                 }
1255                 if (gis & BIT7) {
1256                         pis = read_reg(info, CHA + PIS);
1257                         if (pis & BIT1)
1258                                 dsr_change(info);
1259                         if (pis & BIT2)
1260                                 ri_change(info);
1261                 }
1262         }
1263
1264         /* Request bottom half processing if there's something
1265          * for it to do and the bh is not already running
1266          */
1267
1268         if (info->pending_bh && !info->bh_running && !info->bh_requested) {
1269                 if ( debug_level >= DEBUG_LEVEL_ISR )
1270                         printk("%s(%d):%s queueing bh task.\n",
1271                                 __FILE__,__LINE__,info->device_name);
1272                 schedule_work(&info->task);
1273                 info->bh_requested = true;
1274         }
1275
1276         spin_unlock(&info->lock);
1277         tty_kref_put(tty);
1278
1279         if (debug_level >= DEBUG_LEVEL_ISR)
1280                 printk("%s(%d):mgslpc_isr(%d)exit.\n",
1281                        __FILE__, __LINE__, info->irq_level);
1282
1283         return IRQ_HANDLED;
1284 }
1285
1286 /* Initialize and start device.
1287  */
1288 static int startup(MGSLPC_INFO * info, struct tty_struct *tty)
1289 {
1290         int retval = 0;
1291
1292         if (debug_level >= DEBUG_LEVEL_INFO)
1293                 printk("%s(%d):startup(%s)\n",__FILE__,__LINE__,info->device_name);
1294
1295         if (info->port.flags & ASYNC_INITIALIZED)
1296                 return 0;
1297
1298         if (!info->tx_buf) {
1299                 /* allocate a page of memory for a transmit buffer */
1300                 info->tx_buf = (unsigned char *)get_zeroed_page(GFP_KERNEL);
1301                 if (!info->tx_buf) {
1302                         printk(KERN_ERR"%s(%d):%s can't allocate transmit buffer\n",
1303                                 __FILE__,__LINE__,info->device_name);
1304                         return -ENOMEM;
1305                 }
1306         }
1307
1308         info->pending_bh = 0;
1309
1310         memset(&info->icount, 0, sizeof(info->icount));
1311
1312         setup_timer(&info->tx_timer, tx_timeout, (unsigned long)info);
1313
1314         /* Allocate and claim adapter resources */
1315         retval = claim_resources(info);
1316
1317         /* perform existance check and diagnostics */
1318         if ( !retval )
1319                 retval = adapter_test(info);
1320
1321         if ( retval ) {
1322                 if (capable(CAP_SYS_ADMIN) && tty)
1323                         set_bit(TTY_IO_ERROR, &tty->flags);
1324                 release_resources(info);
1325                 return retval;
1326         }
1327
1328         /* program hardware for current parameters */
1329         mgslpc_change_params(info, tty);
1330
1331         if (tty)
1332                 clear_bit(TTY_IO_ERROR, &tty->flags);
1333
1334         info->port.flags |= ASYNC_INITIALIZED;
1335
1336         return 0;
1337 }
1338
1339 /* Called by mgslpc_close() and mgslpc_hangup() to shutdown hardware
1340  */
1341 static void shutdown(MGSLPC_INFO * info, struct tty_struct *tty)
1342 {
1343         unsigned long flags;
1344
1345         if (!(info->port.flags & ASYNC_INITIALIZED))
1346                 return;
1347
1348         if (debug_level >= DEBUG_LEVEL_INFO)
1349                 printk("%s(%d):mgslpc_shutdown(%s)\n",
1350                          __FILE__,__LINE__, info->device_name );
1351
1352         /* clear status wait queue because status changes */
1353         /* can't happen after shutting down the hardware */
1354         wake_up_interruptible(&info->status_event_wait_q);
1355         wake_up_interruptible(&info->event_wait_q);
1356
1357         del_timer_sync(&info->tx_timer);
1358
1359         if (info->tx_buf) {
1360                 free_page((unsigned long) info->tx_buf);
1361                 info->tx_buf = NULL;
1362         }
1363
1364         spin_lock_irqsave(&info->lock,flags);
1365
1366         rx_stop(info);
1367         tx_stop(info);
1368
1369         /* TODO:disable interrupts instead of reset to preserve signal states */
1370         reset_device(info);
1371
1372         if (!tty || tty->termios->c_cflag & HUPCL) {
1373                 info->serial_signals &= ~(SerialSignal_DTR + SerialSignal_RTS);
1374                 set_signals(info);
1375         }
1376
1377         spin_unlock_irqrestore(&info->lock,flags);
1378
1379         release_resources(info);
1380
1381         if (tty)
1382                 set_bit(TTY_IO_ERROR, &tty->flags);
1383
1384         info->port.flags &= ~ASYNC_INITIALIZED;
1385 }
1386
1387 static void mgslpc_program_hw(MGSLPC_INFO *info, struct tty_struct *tty)
1388 {
1389         unsigned long flags;
1390
1391         spin_lock_irqsave(&info->lock,flags);
1392
1393         rx_stop(info);
1394         tx_stop(info);
1395         info->tx_count = info->tx_put = info->tx_get = 0;
1396
1397         if (info->params.mode == MGSL_MODE_HDLC || info->netcount)
1398                 hdlc_mode(info);
1399         else
1400                 async_mode(info);
1401
1402         set_signals(info);
1403
1404         info->dcd_chkcount = 0;
1405         info->cts_chkcount = 0;
1406         info->ri_chkcount = 0;
1407         info->dsr_chkcount = 0;
1408
1409         irq_enable(info, CHB, IRQ_DCD | IRQ_CTS);
1410         port_irq_enable(info, (unsigned char) PVR_DSR | PVR_RI);
1411         get_signals(info);
1412
1413         if (info->netcount || (tty && (tty->termios->c_cflag & CREAD)))
1414                 rx_start(info);
1415
1416         spin_unlock_irqrestore(&info->lock,flags);
1417 }
1418
1419 /* Reconfigure adapter based on new parameters
1420  */
1421 static void mgslpc_change_params(MGSLPC_INFO *info, struct tty_struct *tty)
1422 {
1423         unsigned cflag;
1424         int bits_per_char;
1425
1426         if (!tty || !tty->termios)
1427                 return;
1428
1429         if (debug_level >= DEBUG_LEVEL_INFO)
1430                 printk("%s(%d):mgslpc_change_params(%s)\n",
1431                          __FILE__,__LINE__, info->device_name );
1432
1433         cflag = tty->termios->c_cflag;
1434
1435         /* if B0 rate (hangup) specified then negate DTR and RTS */
1436         /* otherwise assert DTR and RTS */
1437         if (cflag & CBAUD)
1438                 info->serial_signals |= SerialSignal_RTS + SerialSignal_DTR;
1439         else
1440                 info->serial_signals &= ~(SerialSignal_RTS + SerialSignal_DTR);
1441
1442         /* byte size and parity */
1443
1444         switch (cflag & CSIZE) {
1445         case CS5: info->params.data_bits = 5; break;
1446         case CS6: info->params.data_bits = 6; break;
1447         case CS7: info->params.data_bits = 7; break;
1448         case CS8: info->params.data_bits = 8; break;
1449         default:  info->params.data_bits = 7; break;
1450         }
1451
1452         if (cflag & CSTOPB)
1453                 info->params.stop_bits = 2;
1454         else
1455                 info->params.stop_bits = 1;
1456
1457         info->params.parity = ASYNC_PARITY_NONE;
1458         if (cflag & PARENB) {
1459                 if (cflag & PARODD)
1460                         info->params.parity = ASYNC_PARITY_ODD;
1461                 else
1462                         info->params.parity = ASYNC_PARITY_EVEN;
1463 #ifdef CMSPAR
1464                 if (cflag & CMSPAR)
1465                         info->params.parity = ASYNC_PARITY_SPACE;
1466 #endif
1467         }
1468
1469         /* calculate number of jiffies to transmit a full
1470          * FIFO (32 bytes) at specified data rate
1471          */
1472         bits_per_char = info->params.data_bits +
1473                         info->params.stop_bits + 1;
1474
1475         /* if port data rate is set to 460800 or less then
1476          * allow tty settings to override, otherwise keep the
1477          * current data rate.
1478          */
1479         if (info->params.data_rate <= 460800) {
1480                 info->params.data_rate = tty_get_baud_rate(tty);
1481         }
1482
1483         if ( info->params.data_rate ) {
1484                 info->timeout = (32*HZ*bits_per_char) /
1485                                 info->params.data_rate;
1486         }
1487         info->timeout += HZ/50;         /* Add .02 seconds of slop */
1488
1489         if (cflag & CRTSCTS)
1490                 info->port.flags |= ASYNC_CTS_FLOW;
1491         else
1492                 info->port.flags &= ~ASYNC_CTS_FLOW;
1493
1494         if (cflag & CLOCAL)
1495                 info->port.flags &= ~ASYNC_CHECK_CD;
1496         else
1497                 info->port.flags |= ASYNC_CHECK_CD;
1498
1499         /* process tty input control flags */
1500
1501         info->read_status_mask = 0;
1502         if (I_INPCK(tty))
1503                 info->read_status_mask |= BIT7 | BIT6;
1504         if (I_IGNPAR(tty))
1505                 info->ignore_status_mask |= BIT7 | BIT6;
1506
1507         mgslpc_program_hw(info, tty);
1508 }
1509
1510 /* Add a character to the transmit buffer
1511  */
1512 static int mgslpc_put_char(struct tty_struct *tty, unsigned char ch)
1513 {
1514         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1515         unsigned long flags;
1516
1517         if (debug_level >= DEBUG_LEVEL_INFO) {
1518                 printk( "%s(%d):mgslpc_put_char(%d) on %s\n",
1519                         __FILE__,__LINE__,ch,info->device_name);
1520         }
1521
1522         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_put_char"))
1523                 return 0;
1524
1525         if (!info->tx_buf)
1526                 return 0;
1527
1528         spin_lock_irqsave(&info->lock,flags);
1529
1530         if (info->params.mode == MGSL_MODE_ASYNC || !info->tx_active) {
1531                 if (info->tx_count < TXBUFSIZE - 1) {
1532                         info->tx_buf[info->tx_put++] = ch;
1533                         info->tx_put &= TXBUFSIZE-1;
1534                         info->tx_count++;
1535                 }
1536         }
1537
1538         spin_unlock_irqrestore(&info->lock,flags);
1539         return 1;
1540 }
1541
1542 /* Enable transmitter so remaining characters in the
1543  * transmit buffer are sent.
1544  */
1545 static void mgslpc_flush_chars(struct tty_struct *tty)
1546 {
1547         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1548         unsigned long flags;
1549
1550         if (debug_level >= DEBUG_LEVEL_INFO)
1551                 printk( "%s(%d):mgslpc_flush_chars() entry on %s tx_count=%d\n",
1552                         __FILE__,__LINE__,info->device_name,info->tx_count);
1553
1554         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_flush_chars"))
1555                 return;
1556
1557         if (info->tx_count <= 0 || tty->stopped ||
1558             tty->hw_stopped || !info->tx_buf)
1559                 return;
1560
1561         if (debug_level >= DEBUG_LEVEL_INFO)
1562                 printk( "%s(%d):mgslpc_flush_chars() entry on %s starting transmitter\n",
1563                         __FILE__,__LINE__,info->device_name);
1564
1565         spin_lock_irqsave(&info->lock,flags);
1566         if (!info->tx_active)
1567                 tx_start(info, tty);
1568         spin_unlock_irqrestore(&info->lock,flags);
1569 }
1570
1571 /* Send a block of data
1572  *
1573  * Arguments:
1574  *
1575  * tty        pointer to tty information structure
1576  * buf        pointer to buffer containing send data
1577  * count      size of send data in bytes
1578  *
1579  * Returns: number of characters written
1580  */
1581 static int mgslpc_write(struct tty_struct * tty,
1582                         const unsigned char *buf, int count)
1583 {
1584         int c, ret = 0;
1585         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1586         unsigned long flags;
1587
1588         if (debug_level >= DEBUG_LEVEL_INFO)
1589                 printk( "%s(%d):mgslpc_write(%s) count=%d\n",
1590                         __FILE__,__LINE__,info->device_name,count);
1591
1592         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_write") ||
1593                 !info->tx_buf)
1594                 goto cleanup;
1595
1596         if (info->params.mode == MGSL_MODE_HDLC) {
1597                 if (count > TXBUFSIZE) {
1598                         ret = -EIO;
1599                         goto cleanup;
1600                 }
1601                 if (info->tx_active)
1602                         goto cleanup;
1603                 else if (info->tx_count)
1604                         goto start;
1605         }
1606
1607         for (;;) {
1608                 c = min(count,
1609                         min(TXBUFSIZE - info->tx_count - 1,
1610                             TXBUFSIZE - info->tx_put));
1611                 if (c <= 0)
1612                         break;
1613
1614                 memcpy(info->tx_buf + info->tx_put, buf, c);
1615
1616                 spin_lock_irqsave(&info->lock,flags);
1617                 info->tx_put = (info->tx_put + c) & (TXBUFSIZE-1);
1618                 info->tx_count += c;
1619                 spin_unlock_irqrestore(&info->lock,flags);
1620
1621                 buf += c;
1622                 count -= c;
1623                 ret += c;
1624         }
1625 start:
1626         if (info->tx_count && !tty->stopped && !tty->hw_stopped) {
1627                 spin_lock_irqsave(&info->lock,flags);
1628                 if (!info->tx_active)
1629                         tx_start(info, tty);
1630                 spin_unlock_irqrestore(&info->lock,flags);
1631         }
1632 cleanup:
1633         if (debug_level >= DEBUG_LEVEL_INFO)
1634                 printk( "%s(%d):mgslpc_write(%s) returning=%d\n",
1635                         __FILE__,__LINE__,info->device_name,ret);
1636         return ret;
1637 }
1638
1639 /* Return the count of free bytes in transmit buffer
1640  */
1641 static int mgslpc_write_room(struct tty_struct *tty)
1642 {
1643         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1644         int ret;
1645
1646         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_write_room"))
1647                 return 0;
1648
1649         if (info->params.mode == MGSL_MODE_HDLC) {
1650                 /* HDLC (frame oriented) mode */
1651                 if (info->tx_active)
1652                         return 0;
1653                 else
1654                         return HDLC_MAX_FRAME_SIZE;
1655         } else {
1656                 ret = TXBUFSIZE - info->tx_count - 1;
1657                 if (ret < 0)
1658                         ret = 0;
1659         }
1660
1661         if (debug_level >= DEBUG_LEVEL_INFO)
1662                 printk("%s(%d):mgslpc_write_room(%s)=%d\n",
1663                          __FILE__,__LINE__, info->device_name, ret);
1664         return ret;
1665 }
1666
1667 /* Return the count of bytes in transmit buffer
1668  */
1669 static int mgslpc_chars_in_buffer(struct tty_struct *tty)
1670 {
1671         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1672         int rc;
1673
1674         if (debug_level >= DEBUG_LEVEL_INFO)
1675                 printk("%s(%d):mgslpc_chars_in_buffer(%s)\n",
1676                          __FILE__,__LINE__, info->device_name );
1677
1678         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_chars_in_buffer"))
1679                 return 0;
1680
1681         if (info->params.mode == MGSL_MODE_HDLC)
1682                 rc = info->tx_active ? info->max_frame_size : 0;
1683         else
1684                 rc = info->tx_count;
1685
1686         if (debug_level >= DEBUG_LEVEL_INFO)
1687                 printk("%s(%d):mgslpc_chars_in_buffer(%s)=%d\n",
1688                          __FILE__,__LINE__, info->device_name, rc);
1689
1690         return rc;
1691 }
1692
1693 /* Discard all data in the send buffer
1694  */
1695 static void mgslpc_flush_buffer(struct tty_struct *tty)
1696 {
1697         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1698         unsigned long flags;
1699
1700         if (debug_level >= DEBUG_LEVEL_INFO)
1701                 printk("%s(%d):mgslpc_flush_buffer(%s) entry\n",
1702                          __FILE__,__LINE__, info->device_name );
1703
1704         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_flush_buffer"))
1705                 return;
1706
1707         spin_lock_irqsave(&info->lock,flags);
1708         info->tx_count = info->tx_put = info->tx_get = 0;
1709         del_timer(&info->tx_timer);
1710         spin_unlock_irqrestore(&info->lock,flags);
1711
1712         wake_up_interruptible(&tty->write_wait);
1713         tty_wakeup(tty);
1714 }
1715
1716 /* Send a high-priority XON/XOFF character
1717  */
1718 static void mgslpc_send_xchar(struct tty_struct *tty, char ch)
1719 {
1720         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1721         unsigned long flags;
1722
1723         if (debug_level >= DEBUG_LEVEL_INFO)
1724                 printk("%s(%d):mgslpc_send_xchar(%s,%d)\n",
1725                          __FILE__,__LINE__, info->device_name, ch );
1726
1727         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_send_xchar"))
1728                 return;
1729
1730         info->x_char = ch;
1731         if (ch) {
1732                 spin_lock_irqsave(&info->lock,flags);
1733                 if (!info->tx_enabled)
1734                         tx_start(info, tty);
1735                 spin_unlock_irqrestore(&info->lock,flags);
1736         }
1737 }
1738
1739 /* Signal remote device to throttle send data (our receive data)
1740  */
1741 static void mgslpc_throttle(struct tty_struct * tty)
1742 {
1743         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1744         unsigned long flags;
1745
1746         if (debug_level >= DEBUG_LEVEL_INFO)
1747                 printk("%s(%d):mgslpc_throttle(%s) entry\n",
1748                          __FILE__,__LINE__, info->device_name );
1749
1750         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_throttle"))
1751                 return;
1752
1753         if (I_IXOFF(tty))
1754                 mgslpc_send_xchar(tty, STOP_CHAR(tty));
1755
1756         if (tty->termios->c_cflag & CRTSCTS) {
1757                 spin_lock_irqsave(&info->lock,flags);
1758                 info->serial_signals &= ~SerialSignal_RTS;
1759                 set_signals(info);
1760                 spin_unlock_irqrestore(&info->lock,flags);
1761         }
1762 }
1763
1764 /* Signal remote device to stop throttling send data (our receive data)
1765  */
1766 static void mgslpc_unthrottle(struct tty_struct * tty)
1767 {
1768         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1769         unsigned long flags;
1770
1771         if (debug_level >= DEBUG_LEVEL_INFO)
1772                 printk("%s(%d):mgslpc_unthrottle(%s) entry\n",
1773                          __FILE__,__LINE__, info->device_name );
1774
1775         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_unthrottle"))
1776                 return;
1777
1778         if (I_IXOFF(tty)) {
1779                 if (info->x_char)
1780                         info->x_char = 0;
1781                 else
1782                         mgslpc_send_xchar(tty, START_CHAR(tty));
1783         }
1784
1785         if (tty->termios->c_cflag & CRTSCTS) {
1786                 spin_lock_irqsave(&info->lock,flags);
1787                 info->serial_signals |= SerialSignal_RTS;
1788                 set_signals(info);
1789                 spin_unlock_irqrestore(&info->lock,flags);
1790         }
1791 }
1792
1793 /* get the current serial statistics
1794  */
1795 static int get_stats(MGSLPC_INFO * info, struct mgsl_icount __user *user_icount)
1796 {
1797         int err;
1798         if (debug_level >= DEBUG_LEVEL_INFO)
1799                 printk("get_params(%s)\n", info->device_name);
1800         if (!user_icount) {
1801                 memset(&info->icount, 0, sizeof(info->icount));
1802         } else {
1803                 COPY_TO_USER(err, user_icount, &info->icount, sizeof(struct mgsl_icount));
1804                 if (err)
1805                         return -EFAULT;
1806         }
1807         return 0;
1808 }
1809
1810 /* get the current serial parameters
1811  */
1812 static int get_params(MGSLPC_INFO * info, MGSL_PARAMS __user *user_params)
1813 {
1814         int err;
1815         if (debug_level >= DEBUG_LEVEL_INFO)
1816                 printk("get_params(%s)\n", info->device_name);
1817         COPY_TO_USER(err,user_params, &info->params, sizeof(MGSL_PARAMS));
1818         if (err)
1819                 return -EFAULT;
1820         return 0;
1821 }
1822
1823 /* set the serial parameters
1824  *
1825  * Arguments:
1826  *
1827  *      info            pointer to device instance data
1828  *      new_params      user buffer containing new serial params
1829  *
1830  * Returns:     0 if success, otherwise error code
1831  */
1832 static int set_params(MGSLPC_INFO * info, MGSL_PARAMS __user *new_params, struct tty_struct *tty)
1833 {
1834         unsigned long flags;
1835         MGSL_PARAMS tmp_params;
1836         int err;
1837
1838         if (debug_level >= DEBUG_LEVEL_INFO)
1839                 printk("%s(%d):set_params %s\n", __FILE__,__LINE__,
1840                         info->device_name );
1841         COPY_FROM_USER(err,&tmp_params, new_params, sizeof(MGSL_PARAMS));
1842         if (err) {
1843                 if ( debug_level >= DEBUG_LEVEL_INFO )
1844                         printk( "%s(%d):set_params(%s) user buffer copy failed\n",
1845                                 __FILE__,__LINE__,info->device_name);
1846                 return -EFAULT;
1847         }
1848
1849         spin_lock_irqsave(&info->lock,flags);
1850         memcpy(&info->params,&tmp_params,sizeof(MGSL_PARAMS));
1851         spin_unlock_irqrestore(&info->lock,flags);
1852
1853         mgslpc_change_params(info, tty);
1854
1855         return 0;
1856 }
1857
1858 static int get_txidle(MGSLPC_INFO * info, int __user *idle_mode)
1859 {
1860         int err;
1861         if (debug_level >= DEBUG_LEVEL_INFO)
1862                 printk("get_txidle(%s)=%d\n", info->device_name, info->idle_mode);
1863         COPY_TO_USER(err,idle_mode, &info->idle_mode, sizeof(int));
1864         if (err)
1865                 return -EFAULT;
1866         return 0;
1867 }
1868
1869 static int set_txidle(MGSLPC_INFO * info, int idle_mode)
1870 {
1871         unsigned long flags;
1872         if (debug_level >= DEBUG_LEVEL_INFO)
1873                 printk("set_txidle(%s,%d)\n", info->device_name, idle_mode);
1874         spin_lock_irqsave(&info->lock,flags);
1875         info->idle_mode = idle_mode;
1876         tx_set_idle(info);
1877         spin_unlock_irqrestore(&info->lock,flags);
1878         return 0;
1879 }
1880
1881 static int get_interface(MGSLPC_INFO * info, int __user *if_mode)
1882 {
1883         int err;
1884         if (debug_level >= DEBUG_LEVEL_INFO)
1885                 printk("get_interface(%s)=%d\n", info->device_name, info->if_mode);
1886         COPY_TO_USER(err,if_mode, &info->if_mode, sizeof(int));
1887         if (err)
1888                 return -EFAULT;
1889         return 0;
1890 }
1891
1892 static int set_interface(MGSLPC_INFO * info, int if_mode)
1893 {
1894         unsigned long flags;
1895         unsigned char val;
1896         if (debug_level >= DEBUG_LEVEL_INFO)
1897                 printk("set_interface(%s,%d)\n", info->device_name, if_mode);
1898         spin_lock_irqsave(&info->lock,flags);
1899         info->if_mode = if_mode;
1900
1901         val = read_reg(info, PVR) & 0x0f;
1902         switch (info->if_mode)
1903         {
1904         case MGSL_INTERFACE_RS232: val |= PVR_RS232; break;
1905         case MGSL_INTERFACE_V35:   val |= PVR_V35;   break;
1906         case MGSL_INTERFACE_RS422: val |= PVR_RS422; break;
1907         }
1908         write_reg(info, PVR, val);
1909
1910         spin_unlock_irqrestore(&info->lock,flags);
1911         return 0;
1912 }
1913
1914 static int set_txenable(MGSLPC_INFO * info, int enable, struct tty_struct *tty)
1915 {
1916         unsigned long flags;
1917
1918         if (debug_level >= DEBUG_LEVEL_INFO)
1919                 printk("set_txenable(%s,%d)\n", info->device_name, enable);
1920
1921         spin_lock_irqsave(&info->lock,flags);
1922         if (enable) {
1923                 if (!info->tx_enabled)
1924                         tx_start(info, tty);
1925         } else {
1926                 if (info->tx_enabled)
1927                         tx_stop(info);
1928         }
1929         spin_unlock_irqrestore(&info->lock,flags);
1930         return 0;
1931 }
1932
1933 static int tx_abort(MGSLPC_INFO * info)
1934 {
1935         unsigned long flags;
1936
1937         if (debug_level >= DEBUG_LEVEL_INFO)
1938                 printk("tx_abort(%s)\n", info->device_name);
1939
1940         spin_lock_irqsave(&info->lock,flags);
1941         if (info->tx_active && info->tx_count &&
1942             info->params.mode == MGSL_MODE_HDLC) {
1943                 /* clear data count so FIFO is not filled on next IRQ.
1944                  * This results in underrun and abort transmission.
1945                  */
1946                 info->tx_count = info->tx_put = info->tx_get = 0;
1947                 info->tx_aborting = true;
1948         }
1949         spin_unlock_irqrestore(&info->lock,flags);
1950         return 0;
1951 }
1952
1953 static int set_rxenable(MGSLPC_INFO * info, int enable)
1954 {
1955         unsigned long flags;
1956
1957         if (debug_level >= DEBUG_LEVEL_INFO)
1958                 printk("set_rxenable(%s,%d)\n", info->device_name, enable);
1959
1960         spin_lock_irqsave(&info->lock,flags);
1961         if (enable) {
1962                 if (!info->rx_enabled)
1963                         rx_start(info);
1964         } else {
1965                 if (info->rx_enabled)
1966                         rx_stop(info);
1967         }
1968         spin_unlock_irqrestore(&info->lock,flags);
1969         return 0;
1970 }
1971
1972 /* wait for specified event to occur
1973  *
1974  * Arguments:           info    pointer to device instance data
1975  *                      mask    pointer to bitmask of events to wait for
1976  * Return Value:        0       if successful and bit mask updated with
1977  *                              of events triggerred,
1978  *                      otherwise error code
1979  */
1980 static int wait_events(MGSLPC_INFO * info, int __user *mask_ptr)
1981 {
1982         unsigned long flags;
1983         int s;
1984         int rc=0;
1985         struct mgsl_icount cprev, cnow;
1986         int events;
1987         int mask;
1988         struct  _input_signal_events oldsigs, newsigs;
1989         DECLARE_WAITQUEUE(wait, current);
1990
1991         COPY_FROM_USER(rc,&mask, mask_ptr, sizeof(int));
1992         if (rc)
1993                 return  -EFAULT;
1994
1995         if (debug_level >= DEBUG_LEVEL_INFO)
1996                 printk("wait_events(%s,%d)\n", info->device_name, mask);
1997
1998         spin_lock_irqsave(&info->lock,flags);
1999
2000         /* return immediately if state matches requested events */
2001         get_signals(info);
2002         s = info->serial_signals;
2003         events = mask &
2004                 ( ((s & SerialSignal_DSR) ? MgslEvent_DsrActive:MgslEvent_DsrInactive) +
2005                   ((s & SerialSignal_DCD) ? MgslEvent_DcdActive:MgslEvent_DcdInactive) +
2006                   ((s & SerialSignal_CTS) ? MgslEvent_CtsActive:MgslEvent_CtsInactive) +
2007                   ((s & SerialSignal_RI)  ? MgslEvent_RiActive :MgslEvent_RiInactive) );
2008         if (events) {
2009                 spin_unlock_irqrestore(&info->lock,flags);
2010                 goto exit;
2011         }
2012
2013         /* save current irq counts */
2014         cprev = info->icount;
2015         oldsigs = info->input_signal_events;
2016
2017         if ((info->params.mode == MGSL_MODE_HDLC) &&
2018             (mask & MgslEvent_ExitHuntMode))
2019                 irq_enable(info, CHA, IRQ_EXITHUNT);
2020
2021         set_current_state(TASK_INTERRUPTIBLE);
2022         add_wait_queue(&info->event_wait_q, &wait);
2023
2024         spin_unlock_irqrestore(&info->lock,flags);
2025
2026
2027         for(;;) {
2028                 schedule();
2029                 if (signal_pending(current)) {
2030                         rc = -ERESTARTSYS;
2031                         break;
2032                 }
2033
2034                 /* get current irq counts */
2035                 spin_lock_irqsave(&info->lock,flags);
2036                 cnow = info->icount;
2037                 newsigs = info->input_signal_events;
2038                 set_current_state(TASK_INTERRUPTIBLE);
2039                 spin_unlock_irqrestore(&info->lock,flags);
2040
2041                 /* if no change, wait aborted for some reason */
2042                 if (newsigs.dsr_up   == oldsigs.dsr_up   &&
2043                     newsigs.dsr_down == oldsigs.dsr_down &&
2044                     newsigs.dcd_up   == oldsigs.dcd_up   &&
2045                     newsigs.dcd_down == oldsigs.dcd_down &&
2046                     newsigs.cts_up   == oldsigs.cts_up   &&
2047                     newsigs.cts_down == oldsigs.cts_down &&
2048                     newsigs.ri_up    == oldsigs.ri_up    &&
2049                     newsigs.ri_down  == oldsigs.ri_down  &&
2050                     cnow.exithunt    == cprev.exithunt   &&
2051                     cnow.rxidle      == cprev.rxidle) {
2052                         rc = -EIO;
2053                         break;
2054                 }
2055
2056                 events = mask &
2057                         ( (newsigs.dsr_up   != oldsigs.dsr_up   ? MgslEvent_DsrActive:0)   +
2058                           (newsigs.dsr_down != oldsigs.dsr_down ? MgslEvent_DsrInactive:0) +
2059                           (newsigs.dcd_up   != oldsigs.dcd_up   ? MgslEvent_DcdActive:0)   +
2060                           (newsigs.dcd_down != oldsigs.dcd_down ? MgslEvent_DcdInactive:0) +
2061                           (newsigs.cts_up   != oldsigs.cts_up   ? MgslEvent_CtsActive:0)   +
2062                           (newsigs.cts_down != oldsigs.cts_down ? MgslEvent_CtsInactive:0) +
2063                           (newsigs.ri_up    != oldsigs.ri_up    ? MgslEvent_RiActive:0)    +
2064                           (newsigs.ri_down  != oldsigs.ri_down  ? MgslEvent_RiInactive:0)  +
2065                           (cnow.exithunt    != cprev.exithunt   ? MgslEvent_ExitHuntMode:0) +
2066                           (cnow.rxidle      != cprev.rxidle     ? MgslEvent_IdleReceived:0) );
2067                 if (events)
2068                         break;
2069
2070                 cprev = cnow;
2071                 oldsigs = newsigs;
2072         }
2073
2074         remove_wait_queue(&info->event_wait_q, &wait);
2075         set_current_state(TASK_RUNNING);
2076
2077         if (mask & MgslEvent_ExitHuntMode) {
2078                 spin_lock_irqsave(&info->lock,flags);
2079                 if (!waitqueue_active(&info->event_wait_q))
2080                         irq_disable(info, CHA, IRQ_EXITHUNT);
2081                 spin_unlock_irqrestore(&info->lock,flags);
2082         }
2083 exit:
2084         if (rc == 0)
2085                 PUT_USER(rc, events, mask_ptr);
2086         return rc;
2087 }
2088
2089 static int modem_input_wait(MGSLPC_INFO *info,int arg)
2090 {
2091         unsigned long flags;
2092         int rc;
2093         struct mgsl_icount cprev, cnow;
2094         DECLARE_WAITQUEUE(wait, current);
2095
2096         /* save current irq counts */
2097         spin_lock_irqsave(&info->lock,flags);
2098         cprev = info->icount;
2099         add_wait_queue(&info->status_event_wait_q, &wait);
2100         set_current_state(TASK_INTERRUPTIBLE);
2101         spin_unlock_irqrestore(&info->lock,flags);
2102
2103         for(;;) {
2104                 schedule();
2105                 if (signal_pending(current)) {
2106                         rc = -ERESTARTSYS;
2107                         break;
2108                 }
2109
2110                 /* get new irq counts */
2111                 spin_lock_irqsave(&info->lock,flags);
2112                 cnow = info->icount;
2113                 set_current_state(TASK_INTERRUPTIBLE);
2114                 spin_unlock_irqrestore(&info->lock,flags);
2115
2116                 /* if no change, wait aborted for some reason */
2117                 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
2118                     cnow.dcd == cprev.dcd && cnow.cts == cprev.cts) {
2119                         rc = -EIO;
2120                         break;
2121                 }
2122
2123                 /* check for change in caller specified modem input */
2124                 if ((arg & TIOCM_RNG && cnow.rng != cprev.rng) ||
2125                     (arg & TIOCM_DSR && cnow.dsr != cprev.dsr) ||
2126                     (arg & TIOCM_CD  && cnow.dcd != cprev.dcd) ||
2127                     (arg & TIOCM_CTS && cnow.cts != cprev.cts)) {
2128                         rc = 0;
2129                         break;
2130                 }
2131
2132                 cprev = cnow;
2133         }
2134         remove_wait_queue(&info->status_event_wait_q, &wait);
2135         set_current_state(TASK_RUNNING);
2136         return rc;
2137 }
2138
2139 /* return the state of the serial control and status signals
2140  */
2141 static int tiocmget(struct tty_struct *tty, struct file *file)
2142 {
2143         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
2144         unsigned int result;
2145         unsigned long flags;
2146
2147         spin_lock_irqsave(&info->lock,flags);
2148         get_signals(info);
2149         spin_unlock_irqrestore(&info->lock,flags);
2150
2151         result = ((info->serial_signals & SerialSignal_RTS) ? TIOCM_RTS:0) +
2152                 ((info->serial_signals & SerialSignal_DTR) ? TIOCM_DTR:0) +
2153                 ((info->serial_signals & SerialSignal_DCD) ? TIOCM_CAR:0) +
2154                 ((info->serial_signals & SerialSignal_RI)  ? TIOCM_RNG:0) +
2155                 ((info->serial_signals & SerialSignal_DSR) ? TIOCM_DSR:0) +
2156                 ((info->serial_signals & SerialSignal_CTS) ? TIOCM_CTS:0);
2157
2158         if (debug_level >= DEBUG_LEVEL_INFO)
2159                 printk("%s(%d):%s tiocmget() value=%08X\n",
2160                          __FILE__,__LINE__, info->device_name, result );
2161         return result;
2162 }
2163
2164 /* set modem control signals (DTR/RTS)
2165  */
2166 static int tiocmset(struct tty_struct *tty, struct file *file,
2167                     unsigned int set, unsigned int clear)
2168 {
2169         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
2170         unsigned long flags;
2171
2172         if (debug_level >= DEBUG_LEVEL_INFO)
2173                 printk("%s(%d):%s tiocmset(%x,%x)\n",
2174                         __FILE__,__LINE__,info->device_name, set, clear);
2175
2176         if (set & TIOCM_RTS)
2177                 info->serial_signals |= SerialSignal_RTS;
2178         if (set & TIOCM_DTR)
2179                 info->serial_signals |= SerialSignal_DTR;
2180         if (clear & TIOCM_RTS)
2181                 info->serial_signals &= ~SerialSignal_RTS;
2182         if (clear & TIOCM_DTR)
2183                 info->serial_signals &= ~SerialSignal_DTR;
2184
2185         spin_lock_irqsave(&info->lock,flags);
2186         set_signals(info);
2187         spin_unlock_irqrestore(&info->lock,flags);
2188
2189         return 0;
2190 }
2191
2192 /* Set or clear transmit break condition
2193  *
2194  * Arguments:           tty             pointer to tty instance data
2195  *                      break_state     -1=set break condition, 0=clear
2196  */
2197 static int mgslpc_break(struct tty_struct *tty, int break_state)
2198 {
2199         MGSLPC_INFO * info = (MGSLPC_INFO *)tty->driver_data;
2200         unsigned long flags;
2201
2202         if (debug_level >= DEBUG_LEVEL_INFO)
2203                 printk("%s(%d):mgslpc_break(%s,%d)\n",
2204                          __FILE__,__LINE__, info->device_name, break_state);
2205
2206         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_break"))
2207                 return -EINVAL;
2208
2209         spin_lock_irqsave(&info->lock,flags);
2210         if (break_state == -1)
2211                 set_reg_bits(info, CHA+DAFO, BIT6);
2212         else
2213                 clear_reg_bits(info, CHA+DAFO, BIT6);
2214         spin_unlock_irqrestore(&info->lock,flags);
2215         return 0;
2216 }
2217
2218 /* Service an IOCTL request
2219  *
2220  * Arguments:
2221  *
2222  *      tty     pointer to tty instance data
2223  *      file    pointer to associated file object for device
2224  *      cmd     IOCTL command code
2225  *      arg     command argument/context
2226  *
2227  * Return Value:        0 if success, otherwise error code
2228  */
2229 static int mgslpc_ioctl(struct tty_struct *tty, struct file * file,
2230                         unsigned int cmd, unsigned long arg)
2231 {
2232         MGSLPC_INFO * info = (MGSLPC_INFO *)tty->driver_data;
2233         int error;
2234         struct mgsl_icount cnow;        /* kernel counter temps */
2235         struct serial_icounter_struct __user *p_cuser;  /* user space */
2236         void __user *argp = (void __user *)arg;
2237         unsigned long flags;
2238
2239         if (debug_level >= DEBUG_LEVEL_INFO)
2240                 printk("%s(%d):mgslpc_ioctl %s cmd=%08X\n", __FILE__,__LINE__,
2241                         info->device_name, cmd );
2242
2243         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_ioctl"))
2244                 return -ENODEV;
2245
2246         if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
2247             (cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT)) {
2248                 if (tty->flags & (1 << TTY_IO_ERROR))
2249                     return -EIO;
2250         }
2251
2252         switch (cmd) {
2253         case MGSL_IOCGPARAMS:
2254                 return get_params(info, argp);
2255         case MGSL_IOCSPARAMS:
2256                 return set_params(info, argp, tty);
2257         case MGSL_IOCGTXIDLE:
2258                 return get_txidle(info, argp);
2259         case MGSL_IOCSTXIDLE:
2260                 return set_txidle(info, (int)arg);
2261         case MGSL_IOCGIF:
2262                 return get_interface(info, argp);
2263         case MGSL_IOCSIF:
2264                 return set_interface(info,(int)arg);
2265         case MGSL_IOCTXENABLE:
2266                 return set_txenable(info,(int)arg, tty);
2267         case MGSL_IOCRXENABLE:
2268                 return set_rxenable(info,(int)arg);
2269         case MGSL_IOCTXABORT:
2270                 return tx_abort(info);
2271         case MGSL_IOCGSTATS:
2272                 return get_stats(info, argp);
2273         case MGSL_IOCWAITEVENT:
2274                 return wait_events(info, argp);
2275         case TIOCMIWAIT:
2276                 return modem_input_wait(info,(int)arg);
2277         case TIOCGICOUNT:
2278                 spin_lock_irqsave(&info->lock,flags);
2279                 cnow = info->icount;
2280                 spin_unlock_irqrestore(&info->lock,flags);
2281                 p_cuser = argp;
2282                 PUT_USER(error,cnow.cts, &p_cuser->cts);
2283                 if (error) return error;
2284                 PUT_USER(error,cnow.dsr, &p_cuser->dsr);
2285                 if (error) return error;
2286                 PUT_USER(error,cnow.rng, &p_cuser->rng);
2287                 if (error) return error;
2288                 PUT_USER(error,cnow.dcd, &p_cuser->dcd);
2289                 if (error) return error;
2290                 PUT_USER(error,cnow.rx, &p_cuser->rx);
2291                 if (error) return error;
2292                 PUT_USER(error,cnow.tx, &p_cuser->tx);
2293                 if (error) return error;
2294                 PUT_USER(error,cnow.frame, &p_cuser->frame);
2295                 if (error) return error;
2296                 PUT_USER(error,cnow.overrun, &p_cuser->overrun);
2297                 if (error) return error;
2298                 PUT_USER(error,cnow.parity, &p_cuser->parity);
2299                 if (error) return error;
2300                 PUT_USER(error,cnow.brk, &p_cuser->brk);
2301                 if (error) return error;
2302                 PUT_USER(error,cnow.buf_overrun, &p_cuser->buf_overrun);
2303                 if (error) return error;
2304                 return 0;
2305         default:
2306                 return -ENOIOCTLCMD;
2307         }
2308         return 0;
2309 }
2310
2311 /* Set new termios settings
2312  *
2313  * Arguments:
2314  *
2315  *      tty             pointer to tty structure
2316  *      termios         pointer to buffer to hold returned old termios
2317  */
2318 static void mgslpc_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
2319 {
2320         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
2321         unsigned long flags;
2322
2323         if (debug_level >= DEBUG_LEVEL_INFO)
2324                 printk("%s(%d):mgslpc_set_termios %s\n", __FILE__,__LINE__,
2325                         tty->driver->name );
2326
2327         /* just return if nothing has changed */
2328         if ((tty->termios->c_cflag == old_termios->c_cflag)
2329             && (RELEVANT_IFLAG(tty->termios->c_iflag)
2330                 == RELEVANT_IFLAG(old_termios->c_iflag)))
2331           return;
2332
2333         mgslpc_change_params(info, tty);
2334
2335         /* Handle transition to B0 status */
2336         if (old_termios->c_cflag & CBAUD &&
2337             !(tty->termios->c_cflag & CBAUD)) {
2338                 info->serial_signals &= ~(SerialSignal_RTS + SerialSignal_DTR);
2339                 spin_lock_irqsave(&info->lock,flags);
2340                 set_signals(info);
2341                 spin_unlock_irqrestore(&info->lock,flags);
2342         }
2343
2344         /* Handle transition away from B0 status */
2345         if (!(old_termios->c_cflag & CBAUD) &&
2346             tty->termios->c_cflag & CBAUD) {
2347                 info->serial_signals |= SerialSignal_DTR;
2348                 if (!(tty->termios->c_cflag & CRTSCTS) ||
2349                     !test_bit(TTY_THROTTLED, &tty->flags)) {
2350                         info->serial_signals |= SerialSignal_RTS;
2351                 }
2352                 spin_lock_irqsave(&info->lock,flags);
2353                 set_signals(info);
2354                 spin_unlock_irqrestore(&info->lock,flags);
2355         }
2356
2357         /* Handle turning off CRTSCTS */
2358         if (old_termios->c_cflag & CRTSCTS &&
2359             !(tty->termios->c_cflag & CRTSCTS)) {
2360                 tty->hw_stopped = 0;
2361                 tx_release(tty);
2362         }
2363 }
2364
2365 static void mgslpc_close(struct tty_struct *tty, struct file * filp)
2366 {
2367         MGSLPC_INFO * info = (MGSLPC_INFO *)tty->driver_data;
2368         struct tty_port *port = &info->port;
2369
2370         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_close"))
2371                 return;
2372
2373         if (debug_level >= DEBUG_LEVEL_INFO)
2374                 printk("%s(%d):mgslpc_close(%s) entry, count=%d\n",
2375                          __FILE__,__LINE__, info->device_name, port->count);
2376
2377         WARN_ON(!port->count);
2378
2379         if (tty_port_close_start(port, tty, filp) == 0)
2380                 goto cleanup;
2381
2382         if (port->flags & ASYNC_INITIALIZED)
2383                 mgslpc_wait_until_sent(tty, info->timeout);
2384
2385         mgslpc_flush_buffer(tty);
2386
2387         tty_ldisc_flush(tty);
2388         shutdown(info, tty);
2389
2390         tty_port_close_end(port, tty);
2391         tty_port_tty_set(port, NULL);
2392 cleanup:
2393         if (debug_level >= DEBUG_LEVEL_INFO)
2394                 printk("%s(%d):mgslpc_close(%s) exit, count=%d\n", __FILE__,__LINE__,
2395                         tty->driver->name, port->count);
2396 }
2397
2398 /* Wait until the transmitter is empty.
2399  */
2400 static void mgslpc_wait_until_sent(struct tty_struct *tty, int timeout)
2401 {
2402         MGSLPC_INFO * info = (MGSLPC_INFO *)tty->driver_data;
2403         unsigned long orig_jiffies, char_time;
2404
2405         if (!info )
2406                 return;
2407
2408         if (debug_level >= DEBUG_LEVEL_INFO)
2409                 printk("%s(%d):mgslpc_wait_until_sent(%s) entry\n",
2410                          __FILE__,__LINE__, info->device_name );
2411
2412         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_wait_until_sent"))
2413                 return;
2414
2415         if (!(info->port.flags & ASYNC_INITIALIZED))
2416                 goto exit;
2417
2418         orig_jiffies = jiffies;
2419
2420         /* Set check interval to 1/5 of estimated time to
2421          * send a character, and make it at least 1. The check
2422          * interval should also be less than the timeout.
2423          * Note: use tight timings here to satisfy the NIST-PCTS.
2424          */
2425
2426         if ( info->params.data_rate ) {
2427                 char_time = info->timeout/(32 * 5);
2428                 if (!char_time)
2429                         char_time++;
2430         } else
2431                 char_time = 1;
2432
2433         if (timeout)
2434                 char_time = min_t(unsigned long, char_time, timeout);
2435
2436         if (info->params.mode == MGSL_MODE_HDLC) {
2437                 while (info->tx_active) {
2438                         msleep_interruptible(jiffies_to_msecs(char_time));
2439                         if (signal_pending(current))
2440                                 break;
2441                         if (timeout && time_after(jiffies, orig_jiffies + timeout))
2442                                 break;
2443                 }
2444         } else {
2445                 while ((info->tx_count || info->tx_active) &&
2446                         info->tx_enabled) {
2447                         msleep_interruptible(jiffies_to_msecs(char_time));
2448                         if (signal_pending(current))
2449                                 break;
2450                         if (timeout && time_after(jiffies, orig_jiffies + timeout))
2451                                 break;
2452                 }
2453         }
2454
2455 exit:
2456         if (debug_level >= DEBUG_LEVEL_INFO)
2457                 printk("%s(%d):mgslpc_wait_until_sent(%s) exit\n",
2458                          __FILE__,__LINE__, info->device_name );
2459 }
2460
2461 /* Called by tty_hangup() when a hangup is signaled.
2462  * This is the same as closing all open files for the port.
2463  */
2464 static void mgslpc_hangup(struct tty_struct *tty)
2465 {
2466         MGSLPC_INFO * info = (MGSLPC_INFO *)tty->driver_data;
2467
2468         if (debug_level >= DEBUG_LEVEL_INFO)
2469                 printk("%s(%d):mgslpc_hangup(%s)\n",
2470                          __FILE__,__LINE__, info->device_name );
2471
2472         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_hangup"))
2473                 return;
2474
2475         mgslpc_flush_buffer(tty);
2476         shutdown(info, tty);
2477         tty_port_hangup(&info->port);
2478 }
2479
2480 static int carrier_raised(struct tty_port *port)
2481 {
2482         MGSLPC_INFO *info = container_of(port, MGSLPC_INFO, port);
2483         unsigned long flags;
2484
2485         spin_lock_irqsave(&info->lock,flags);
2486         get_signals(info);
2487         spin_unlock_irqrestore(&info->lock,flags);
2488
2489         if (info->serial_signals & SerialSignal_DCD)
2490                 return 1;
2491         return 0;
2492 }
2493
2494 static void dtr_rts(struct tty_port *port, int onoff)
2495 {
2496         MGSLPC_INFO *info = container_of(port, MGSLPC_INFO, port);
2497         unsigned long flags;
2498
2499         spin_lock_irqsave(&info->lock,flags);
2500         if (onoff)
2501                 info->serial_signals |= SerialSignal_RTS + SerialSignal_DTR;
2502         else
2503                 info->serial_signals &= ~SerialSignal_RTS + SerialSignal_DTR;
2504         set_signals(info);
2505         spin_unlock_irqrestore(&info->lock,flags);
2506 }
2507
2508
2509 static int mgslpc_open(struct tty_struct *tty, struct file * filp)
2510 {
2511         MGSLPC_INFO     *info;
2512         struct tty_port *port;
2513         int                     retval, line;
2514         unsigned long flags;
2515
2516         /* verify range of specified line number */
2517         line = tty->index;
2518         if ((line < 0) || (line >= mgslpc_device_count)) {
2519                 printk("%s(%d):mgslpc_open with invalid line #%d.\n",
2520                         __FILE__,__LINE__,line);
2521                 return -ENODEV;
2522         }
2523
2524         /* find the info structure for the specified line */
2525         info = mgslpc_device_list;
2526         while(info && info->line != line)
2527                 info = info->next_device;
2528         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_open"))
2529                 return -ENODEV;
2530
2531         port = &info->port;
2532         tty->driver_data = info;
2533         tty_port_tty_set(port, tty);
2534
2535         if (debug_level >= DEBUG_LEVEL_INFO)
2536                 printk("%s(%d):mgslpc_open(%s), old ref count = %d\n",
2537                          __FILE__,__LINE__,tty->driver->name, port->count);
2538
2539         /* If port is closing, signal caller to try again */
2540         if (tty_hung_up_p(filp) || port->flags & ASYNC_CLOSING){
2541                 if (port->flags & ASYNC_CLOSING)
2542                         interruptible_sleep_on(&port->close_wait);
2543                 retval = ((port->flags & ASYNC_HUP_NOTIFY) ?
2544                         -EAGAIN : -ERESTARTSYS);
2545                 goto cleanup;
2546         }
2547
2548         tty->low_latency = (port->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
2549
2550         spin_lock_irqsave(&info->netlock, flags);
2551         if (info->netcount) {
2552                 retval = -EBUSY;
2553                 spin_unlock_irqrestore(&info->netlock, flags);
2554                 goto cleanup;
2555         }
2556         spin_lock(&port->lock);
2557         port->count++;
2558         spin_unlock(&port->lock);
2559         spin_unlock_irqrestore(&info->netlock, flags);
2560
2561         if (port->count == 1) {
2562                 /* 1st open on this device, init hardware */
2563                 retval = startup(info, tty);
2564                 if (retval < 0)
2565                         goto cleanup;
2566         }
2567
2568         retval = tty_port_block_til_ready(&info->port, tty, filp);
2569         if (retval) {
2570                 if (debug_level >= DEBUG_LEVEL_INFO)
2571                         printk("%s(%d):block_til_ready(%s) returned %d\n",
2572                                  __FILE__,__LINE__, info->device_name, retval);
2573                 goto cleanup;
2574         }
2575
2576         if (debug_level >= DEBUG_LEVEL_INFO)
2577                 printk("%s(%d):mgslpc_open(%s) success\n",
2578                          __FILE__,__LINE__, info->device_name);
2579         retval = 0;
2580
2581 cleanup:
2582         return retval;
2583 }
2584
2585 /*
2586  * /proc fs routines....
2587  */
2588
2589 static inline void line_info(struct seq_file *m, MGSLPC_INFO *info)
2590 {
2591         char    stat_buf[30];
2592         unsigned long flags;
2593
2594         seq_printf(m, "%s:io:%04X irq:%d",
2595                       info->device_name, info->io_base, info->irq_level);
2596
2597         /* output current serial signal states */
2598         spin_lock_irqsave(&info->lock,flags);
2599         get_signals(info);
2600         spin_unlock_irqrestore(&info->lock,flags);
2601
2602         stat_buf[0] = 0;
2603         stat_buf[1] = 0;
2604         if (info->serial_signals & SerialSignal_RTS)
2605                 strcat(stat_buf, "|RTS");
2606         if (info->serial_signals & SerialSignal_CTS)
2607                 strcat(stat_buf, "|CTS");
2608         if (info->serial_signals & SerialSignal_DTR)
2609                 strcat(stat_buf, "|DTR");
2610         if (info->serial_signals & SerialSignal_DSR)
2611                 strcat(stat_buf, "|DSR");
2612         if (info->serial_signals & SerialSignal_DCD)
2613                 strcat(stat_buf, "|CD");
2614         if (info->serial_signals & SerialSignal_RI)
2615                 strcat(stat_buf, "|RI");
2616
2617         if (info->params.mode == MGSL_MODE_HDLC) {
2618                 seq_printf(m, " HDLC txok:%d rxok:%d",
2619                               info->icount.txok, info->icount.rxok);
2620                 if (info->icount.txunder)
2621                         seq_printf(m, " txunder:%d", info->icount.txunder);
2622                 if (info->icount.txabort)
2623                         seq_printf(m, " txabort:%d", info->icount.txabort);
2624                 if (info->icount.rxshort)
2625                         seq_printf(m, " rxshort:%d", info->icount.rxshort);
2626                 if (info->icount.rxlong)
2627                         seq_printf(m, " rxlong:%d", info->icount.rxlong);
2628                 if (info->icount.rxover)
2629                         seq_printf(m, " rxover:%d", info->icount.rxover);
2630                 if (info->icount.rxcrc)
2631                         seq_printf(m, " rxcrc:%d", info->icount.rxcrc);
2632         } else {
2633                 seq_printf(m, " ASYNC tx:%d rx:%d",
2634                               info->icount.tx, info->icount.rx);
2635                 if (info->icount.frame)
2636                         seq_printf(m, " fe:%d", info->icount.frame);
2637                 if (info->icount.parity)
2638                         seq_printf(m, " pe:%d", info->icount.parity);
2639                 if (info->icount.brk)
2640                         seq_printf(m, " brk:%d", info->icount.brk);
2641                 if (info->icount.overrun)
2642                         seq_printf(m, " oe:%d", info->icount.overrun);
2643         }
2644
2645         /* Append serial signal status to end */
2646         seq_printf(m, " %s\n", stat_buf+1);
2647
2648         seq_printf(m, "txactive=%d bh_req=%d bh_run=%d pending_bh=%x\n",
2649                        info->tx_active,info->bh_requested,info->bh_running,
2650                        info->pending_bh);
2651 }
2652
2653 /* Called to print information about devices
2654  */
2655 static int mgslpc_proc_show(struct seq_file *m, void *v)
2656 {
2657         MGSLPC_INFO *info;
2658
2659         seq_printf(m, "synclink driver:%s\n", driver_version);
2660
2661         info = mgslpc_device_list;
2662         while( info ) {
2663                 line_info(m, info);
2664                 info = info->next_device;
2665         }
2666         return 0;
2667 }
2668
2669 static int mgslpc_proc_open(struct inode *inode, struct file *file)
2670 {
2671         return single_open(file, mgslpc_proc_show, NULL);
2672 }
2673
2674 static const struct file_operations mgslpc_proc_fops = {
2675         .owner          = THIS_MODULE,
2676         .open           = mgslpc_proc_open,
2677         .read           = seq_read,
2678         .llseek         = seq_lseek,
2679         .release        = single_release,
2680 };
2681
2682 static int rx_alloc_buffers(MGSLPC_INFO *info)
2683 {
2684         /* each buffer has header and data */
2685         info->rx_buf_size = sizeof(RXBUF) + info->max_frame_size;
2686
2687         /* calculate total allocation size for 8 buffers */
2688         info->rx_buf_total_size = info->rx_buf_size * 8;
2689
2690         /* limit total allocated memory */
2691         if (info->rx_buf_total_size > 0x10000)
2692                 info->rx_buf_total_size = 0x10000;
2693
2694         /* calculate number of buffers */
2695         info->rx_buf_count = info->rx_buf_total_size / info->rx_buf_size;
2696
2697         info->rx_buf = kmalloc(info->rx_buf_total_size, GFP_KERNEL);
2698         if (info->rx_buf == NULL)
2699                 return -ENOMEM;
2700
2701         rx_reset_buffers(info);
2702         return 0;
2703 }
2704
2705 static void rx_free_buffers(MGSLPC_INFO *info)
2706 {
2707         kfree(info->rx_buf);
2708         info->rx_buf = NULL;
2709 }
2710
2711 static int claim_resources(MGSLPC_INFO *info)
2712 {
2713         if (rx_alloc_buffers(info) < 0 ) {
2714                 printk( "Cant allocate rx buffer %s\n", info->device_name);
2715                 release_resources(info);
2716                 return -ENODEV;
2717         }
2718         return 0;
2719 }
2720
2721 static void release_resources(MGSLPC_INFO *info)
2722 {
2723         if (debug_level >= DEBUG_LEVEL_INFO)
2724                 printk("release_resources(%s)\n", info->device_name);
2725         rx_free_buffers(info);
2726 }
2727
2728 /* Add the specified device instance data structure to the
2729  * global linked list of devices and increment the device count.
2730  *
2731  * Arguments:           info    pointer to device instance data
2732  */
2733 static void mgslpc_add_device(MGSLPC_INFO *info)
2734 {
2735         info->next_device = NULL;
2736         info->line = mgslpc_device_count;
2737         sprintf(info->device_name,"ttySLP%d",info->line);
2738
2739         if (info->line < MAX_DEVICE_COUNT) {
2740                 if (maxframe[info->line])
2741                         info->max_frame_size = maxframe[info->line];
2742         }
2743
2744         mgslpc_device_count++;
2745
2746         if (!mgslpc_device_list)
2747                 mgslpc_device_list = info;
2748         else {
2749                 MGSLPC_INFO *current_dev = mgslpc_device_list;
2750                 while( current_dev->next_device )
2751                         current_dev = current_dev->next_device;
2752                 current_dev->next_device = info;
2753         }
2754
2755         if (info->max_frame_size < 4096)
2756                 info->max_frame_size = 4096;
2757         else if (info->max_frame_size > 65535)
2758                 info->max_frame_size = 65535;
2759
2760         printk( "SyncLink PC Card %s:IO=%04X IRQ=%d\n",
2761                 info->device_name, info->io_base, info->irq_level);
2762
2763 #if SYNCLINK_GENERIC_HDLC
2764         hdlcdev_init(info);
2765 #endif
2766 }
2767
2768 static void mgslpc_remove_device(MGSLPC_INFO *remove_info)
2769 {
2770         MGSLPC_INFO *info = mgslpc_device_list;
2771         MGSLPC_INFO *last = NULL;
2772
2773         while(info) {
2774                 if (info == remove_info) {
2775                         if (last)
2776                                 last->next_device = info->next_device;
2777                         else
2778                                 mgslpc_device_list = info->next_device;
2779 #if SYNCLINK_GENERIC_HDLC
2780                         hdlcdev_exit(info);
2781 #endif
2782                         release_resources(info);
2783                         kfree(info);
2784                         mgslpc_device_count--;
2785                         return;
2786                 }
2787                 last = info;
2788                 info = info->next_device;
2789         }
2790 }
2791
2792 static struct pcmcia_device_id mgslpc_ids[] = {
2793         PCMCIA_DEVICE_MANF_CARD(0x02c5, 0x0050),
2794         PCMCIA_DEVICE_NULL
2795 };
2796 MODULE_DEVICE_TABLE(pcmcia, mgslpc_ids);
2797
2798 static struct pcmcia_driver mgslpc_driver = {
2799         .owner          = THIS_MODULE,
2800         .drv            = {
2801                 .name   = "synclink_cs",
2802         },
2803         .probe          = mgslpc_probe,
2804         .remove         = mgslpc_detach,
2805         .id_table       = mgslpc_ids,
2806         .suspend        = mgslpc_suspend,
2807         .resume         = mgslpc_resume,
2808 };
2809
2810 static const struct tty_operations mgslpc_ops = {
2811         .open = mgslpc_open,
2812         .close = mgslpc_close,
2813         .write = mgslpc_write,
2814         .put_char = mgslpc_put_char,
2815         .flush_chars = mgslpc_flush_chars,
2816         .write_room = mgslpc_write_room,
2817         .chars_in_buffer = mgslpc_chars_in_buffer,
2818         .flush_buffer = mgslpc_flush_buffer,
2819         .ioctl = mgslpc_ioctl,
2820         .throttle = mgslpc_throttle,
2821         .unthrottle = mgslpc_unthrottle,
2822         .send_xchar = mgslpc_send_xchar,
2823         .break_ctl = mgslpc_break,
2824         .wait_until_sent = mgslpc_wait_until_sent,
2825         .set_termios = mgslpc_set_termios,
2826         .stop = tx_pause,
2827         .start = tx_release,
2828         .hangup = mgslpc_hangup,
2829         .tiocmget = tiocmget,
2830         .tiocmset = tiocmset,
2831         .proc_fops = &mgslpc_proc_fops,
2832 };
2833
2834 static void synclink_cs_cleanup(void)
2835 {
2836         int rc;
2837
2838         printk("Unloading %s: version %s\n", driver_name, driver_version);
2839
2840         while(mgslpc_device_list)
2841                 mgslpc_remove_device(mgslpc_device_list);
2842
2843         if (serial_driver) {
2844                 if ((rc = tty_unregister_driver(serial_driver)))
2845                         printk("%s(%d) failed to unregister tty driver err=%d\n",
2846                                __FILE__,__LINE__,rc);
2847                 put_tty_driver(serial_driver);
2848         }
2849
2850         pcmcia_unregister_driver(&mgslpc_driver);
2851 }
2852
2853 static int __init synclink_cs_init(void)
2854 {
2855     int rc;
2856
2857     if (break_on_load) {
2858             mgslpc_get_text_ptr();
2859             BREAKPOINT();
2860     }
2861
2862     printk("%s %s\n", driver_name, driver_version);
2863
2864     if ((rc = pcmcia_register_driver(&mgslpc_driver)) < 0)
2865             return rc;
2866
2867     serial_driver = alloc_tty_driver(MAX_DEVICE_COUNT);
2868     if (!serial_driver) {
2869             rc = -ENOMEM;
2870             goto error;
2871     }
2872
2873     /* Initialize the tty_driver structure */
2874
2875     serial_driver->owner = THIS_MODULE;
2876     serial_driver->driver_name = "synclink_cs";
2877     serial_driver->name = "ttySLP";
2878     serial_driver->major = ttymajor;
2879     serial_driver->minor_start = 64;
2880     serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
2881     serial_driver->subtype = SERIAL_TYPE_NORMAL;
2882     serial_driver->init_termios = tty_std_termios;
2883     serial_driver->init_termios.c_cflag =
2884             B9600 | CS8 | CREAD | HUPCL | CLOCAL;
2885     serial_driver->flags = TTY_DRIVER_REAL_RAW;
2886     tty_set_operations(serial_driver, &mgslpc_ops);
2887
2888     if ((rc = tty_register_driver(serial_driver)) < 0) {
2889             printk("%s(%d):Couldn't register serial driver\n",
2890                    __FILE__,__LINE__);
2891             put_tty_driver(serial_driver);
2892             serial_driver = NULL;
2893             goto error;
2894     }
2895
2896     printk("%s %s, tty major#%d\n",
2897            driver_name, driver_version,
2898            serial_driver->major);
2899
2900     return 0;
2901
2902 error:
2903     synclink_cs_cleanup();
2904     return rc;
2905 }
2906
2907 static void __exit synclink_cs_exit(void)
2908 {
2909         synclink_cs_cleanup();
2910 }
2911
2912 module_init(synclink_cs_init);
2913 module_exit(synclink_cs_exit);
2914
2915 static void mgslpc_set_rate(MGSLPC_INFO *info, unsigned char channel, unsigned int rate)
2916 {
2917         unsigned int M, N;
2918         unsigned char val;
2919
2920         /* note:standard BRG mode is broken in V3.2 chip
2921          * so enhanced mode is always used
2922          */
2923
2924         if (rate) {
2925                 N = 3686400 / rate;
2926                 if (!N)
2927                         N = 1;
2928                 N >>= 1;
2929                 for (M = 1; N > 64 && M < 16; M++)
2930                         N >>= 1;
2931                 N--;
2932
2933                 /* BGR[5..0] = N
2934                  * BGR[9..6] = M
2935                  * BGR[7..0] contained in BGR register
2936                  * BGR[9..8] contained in CCR2[7..6]
2937                  * divisor = (N+1)*2^M
2938                  *
2939                  * Note: M *must* not be zero (causes asymetric duty cycle)
2940                  */
2941                 write_reg(info, (unsigned char) (channel + BGR),
2942                                   (unsigned char) ((M << 6) + N));
2943                 val = read_reg(info, (unsigned char) (channel + CCR2)) & 0x3f;
2944                 val |= ((M << 4) & 0xc0);
2945                 write_reg(info, (unsigned char) (channel + CCR2), val);
2946         }
2947 }
2948
2949 /* Enabled the AUX clock output at the specified frequency.
2950  */
2951 static void enable_auxclk(MGSLPC_INFO *info)
2952 {
2953         unsigned char val;
2954
2955         /* MODE
2956          *
2957          * 07..06  MDS[1..0] 10 = transparent HDLC mode
2958          * 05      ADM Address Mode, 0 = no addr recognition
2959          * 04      TMD Timer Mode, 0 = external
2960          * 03      RAC Receiver Active, 0 = inactive
2961          * 02      RTS 0=RTS active during xmit, 1=RTS always active
2962          * 01      TRS Timer Resolution, 1=512
2963          * 00      TLP Test Loop, 0 = no loop
2964          *
2965          * 1000 0010
2966          */
2967         val = 0x82;
2968
2969         /* channel B RTS is used to enable AUXCLK driver on SP505 */
2970         if (info->params.mode == MGSL_MODE_HDLC && info->params.clock_speed)
2971                 val |= BIT2;
2972         write_reg(info, CHB + MODE, val);
2973
2974         /* CCR0
2975          *
2976          * 07      PU Power Up, 1=active, 0=power down
2977          * 06      MCE Master Clock Enable, 1=enabled
2978          * 05      Reserved, 0
2979          * 04..02  SC[2..0] Encoding
2980          * 01..00  SM[1..0] Serial Mode, 00=HDLC
2981          *
2982          * 11000000
2983          */
2984         write_reg(info, CHB + CCR0, 0xc0);
2985
2986         /* CCR1
2987          *
2988          * 07      SFLG Shared Flag, 0 = disable shared flags
2989          * 06      GALP Go Active On Loop, 0 = not used
2990          * 05      GLP Go On Loop, 0 = not used
2991          * 04      ODS Output Driver Select, 1=TxD is push-pull output
2992          * 03      ITF Interframe Time Fill, 0=mark, 1=flag
2993          * 02..00  CM[2..0] Clock Mode
2994          *
2995          * 0001 0111
2996          */
2997         write_reg(info, CHB + CCR1, 0x17);
2998
2999         /* CCR2 (Channel B)
3000          *
3001          * 07..06  BGR[9..8] Baud rate bits 9..8
3002          * 05      BDF Baud rate divisor factor, 0=1, 1=BGR value
3003          * 04      SSEL Clock source select, 1=submode b
3004          * 03      TOE 0=TxCLK is input, 1=TxCLK is output
3005          * 02      RWX Read/Write Exchange 0=disabled
3006          * 01      C32, CRC select, 0=CRC-16, 1=CRC-32
3007          * 00      DIV, data inversion 0=disabled, 1=enabled
3008          *
3009          * 0011 1000
3010          */
3011         if (info->params.mode == MGSL_MODE_HDLC && info->params.clock_speed)
3012                 write_reg(info, CHB + CCR2, 0x38);
3013         else
3014                 write_reg(info, CHB + CCR2, 0x30);
3015
3016         /* CCR4
3017          *
3018          * 07      MCK4 Master Clock Divide by 4, 1=enabled
3019          * 06      EBRG Enhanced Baud Rate Generator Mode, 1=enabled
3020          * 05      TST1 Test Pin, 0=normal operation
3021          * 04      ICD Ivert Carrier Detect, 1=enabled (active low)
3022          * 03..02  Reserved, must be 0
3023          * 01..00  RFT[1..0] RxFIFO Threshold 00=32 bytes
3024          *
3025          * 0101 0000
3026          */
3027         write_reg(info, CHB + CCR4, 0x50);
3028
3029         /* if auxclk not enabled, set internal BRG so
3030          * CTS transitions can be detected (requires TxC)
3031          */
3032         if (info->params.mode == MGSL_MODE_HDLC && info->params.clock_speed)
3033                 mgslpc_set_rate(info, CHB, info->params.clock_speed);
3034         else
3035                 mgslpc_set_rate(info, CHB, 921600);
3036 }
3037
3038 static void loopback_enable(MGSLPC_INFO *info)
3039 {
3040         unsigned char val;
3041
3042         /* CCR1:02..00  CM[2..0] Clock Mode = 111 (clock mode 7) */
3043         val = read_reg(info, CHA + CCR1) | (BIT2 + BIT1 + BIT0);
3044         write_reg(info, CHA + CCR1, val);
3045
3046         /* CCR2:04 SSEL Clock source select, 1=submode b */
3047         val = read_reg(info, CHA + CCR2) | (BIT4 + BIT5);
3048         write_reg(info, CHA + CCR2, val);
3049
3050         /* set LinkSpeed if available, otherwise default to 2Mbps */
3051         if (info->params.clock_speed)
3052                 mgslpc_set_rate(info, CHA, info->params.clock_speed);
3053         else
3054                 mgslpc_set_rate(info, CHA, 1843200);
3055
3056         /* MODE:00 TLP Test Loop, 1=loopback enabled */
3057         val = read_reg(info, CHA + MODE) | BIT0;
3058         write_reg(info, CHA + MODE, val);
3059 }
3060
3061 static void hdlc_mode(MGSLPC_INFO *info)
3062 {
3063         unsigned char val;
3064         unsigned char clkmode, clksubmode;
3065
3066         /* disable all interrupts */
3067         irq_disable(info, CHA, 0xffff);
3068         irq_disable(info, CHB, 0xffff);
3069         port_irq_disable(info, 0xff);
3070
3071         /* assume clock mode 0a, rcv=RxC xmt=TxC */
3072         clkmode = clksubmode = 0;
3073         if (info->params.flags & HDLC_FLAG_RXC_DPLL
3074             && info->params.flags & HDLC_FLAG_TXC_DPLL) {
3075                 /* clock mode 7a, rcv = DPLL, xmt = DPLL */
3076                 clkmode = 7;
3077         } else if (info->params.flags & HDLC_FLAG_RXC_BRG
3078                  && info->params.flags & HDLC_FLAG_TXC_BRG) {
3079                 /* clock mode 7b, rcv = BRG, xmt = BRG */
3080                 clkmode = 7;
3081                 clksubmode = 1;
3082         } else if (info->params.flags & HDLC_FLAG_RXC_DPLL) {
3083                 if (info->params.flags & HDLC_FLAG_TXC_BRG) {
3084                         /* clock mode 6b, rcv = DPLL, xmt = BRG/16 */
3085                         clkmode = 6;
3086                         clksubmode = 1;
3087                 } else {
3088                         /* clock mode 6a, rcv = DPLL, xmt = TxC */
3089                         clkmode = 6;
3090                 }
3091         } else if (info->params.flags & HDLC_FLAG_TXC_BRG) {
3092                 /* clock mode 0b, rcv = RxC, xmt = BRG */
3093                 clksubmode = 1;
3094         }
3095
3096         /* MODE
3097          *
3098          * 07..06  MDS[1..0] 10 = transparent HDLC mode
3099          * 05      ADM Address Mode, 0 = no addr recognition
3100          * 04      TMD Timer Mode, 0 = external
3101          * 03      RAC Receiver Active, 0 = inactive
3102          * 02      RTS 0=RTS active during xmit, 1=RTS always active
3103          * 01      TRS Timer Resolution, 1=512
3104          * 00      TLP Test Loop, 0 = no loop
3105          *
3106          * 1000 0010
3107          */
3108         val = 0x82;
3109         if (info->params.loopback)
3110                 val |= BIT0;
3111
3112         /* preserve RTS state */
3113         if (info->serial_signals & SerialSignal_RTS)
3114                 val |= BIT2;
3115         write_reg(info, CHA + MODE, val);
3116
3117         /* CCR0
3118          *
3119          * 07      PU Power Up, 1=active, 0=power down
3120          * 06      MCE Master Clock Enable, 1=enabled
3121          * 05      Reserved, 0
3122          * 04..02  SC[2..0] Encoding
3123          * 01..00  SM[1..0] Serial Mode, 00=HDLC
3124          *
3125          * 11000000
3126          */
3127         val = 0xc0;
3128         switch (info->params.encoding)
3129         {
3130         case HDLC_ENCODING_NRZI:
3131                 val |= BIT3;
3132                 break;
3133         case HDLC_ENCODING_BIPHASE_SPACE:
3134                 val |= BIT4;
3135                 break;          // FM0
3136         case HDLC_ENCODING_BIPHASE_MARK:
3137                 val |= BIT4 + BIT2;
3138                 break;          // FM1
3139         case HDLC_ENCODING_BIPHASE_LEVEL:
3140                 val |= BIT4 + BIT3;
3141                 break;          // Manchester
3142         }
3143         write_reg(info, CHA + CCR0, val);
3144
3145         /* CCR1
3146          *
3147          * 07      SFLG Shared Flag, 0 = disable shared flags
3148          * 06      GALP Go Active On Loop, 0 = not used
3149          * 05      GLP Go On Loop, 0 = not used
3150          * 04      ODS Output Driver Select, 1=TxD is push-pull output
3151          * 03      ITF Interframe Time Fill, 0=mark, 1=flag
3152          * 02..00  CM[2..0] Clock Mode
3153          *
3154          * 0001 0000
3155          */
3156         val = 0x10 + clkmode;
3157         write_reg(info, CHA + CCR1, val);
3158
3159         /* CCR2
3160          *
3161          * 07..06  BGR[9..8] Baud rate bits 9..8
3162          * 05      BDF Baud rate divisor factor, 0=1, 1=BGR value
3163          * 04      SSEL Clock source select, 1=submode b
3164          * 03      TOE 0=TxCLK is input, 0=TxCLK is input
3165          * 02      RWX Read/Write Exchange 0=disabled
3166          * 01      C32, CRC select, 0=CRC-16, 1=CRC-32
3167          * 00      DIV, data inversion 0=disabled, 1=enabled
3168          *
3169          * 0000 0000
3170          */
3171         val = 0x00;
3172         if (clkmode == 2 || clkmode == 3 || clkmode == 6
3173             || clkmode == 7 || (clkmode == 0 && clksubmode == 1))
3174                 val |= BIT5;
3175         if (clksubmode)
3176                 val |= BIT4;
3177         if (info->params.crc_type == HDLC_CRC_32_CCITT)
3178                 val |= BIT1;
3179         if (info->params.encoding == HDLC_ENCODING_NRZB)
3180                 val |= BIT0;
3181         write_reg(info, CHA + CCR2, val);
3182
3183         /* CCR3
3184          *
3185          * 07..06  PRE[1..0] Preamble count 00=1, 01=2, 10=4, 11=8
3186          * 05      EPT Enable preamble transmission, 1=enabled
3187          * 04      RADD Receive address pushed to FIFO, 0=disabled
3188          * 03      CRL CRC Reset Level, 0=FFFF
3189          * 02      RCRC Rx CRC 0=On 1=Off
3190          * 01      TCRC Tx CRC 0=On 1=Off
3191          * 00      PSD DPLL Phase Shift Disable
3192          *
3193          * 0000 0000
3194          */
3195         val = 0x00;
3196         if (info->params.crc_type == HDLC_CRC_NONE)
3197                 val |= BIT2 + BIT1;
3198         if (info->params.preamble != HDLC_PREAMBLE_PATTERN_NONE)
3199                 val |= BIT5;
3200         switch (info->params.preamble_length)
3201         {
3202         case HDLC_PREAMBLE_LENGTH_16BITS:
3203                 val |= BIT6;
3204                 break;
3205         case HDLC_PREAMBLE_LENGTH_32BITS:
3206                 val |= BIT6;
3207                 break;
3208         case HDLC_PREAMBLE_LENGTH_64BITS:
3209                 val |= BIT7 + BIT6;
3210                 break;
3211         }
3212         write_reg(info, CHA + CCR3, val);
3213
3214         /* PRE - Preamble pattern */
3215         val = 0;
3216         switch (info->params.preamble)
3217         {
3218         case HDLC_PREAMBLE_PATTERN_FLAGS: val = 0x7e; break;
3219         case HDLC_PREAMBLE_PATTERN_10:    val = 0xaa; break;
3220         case HDLC_PREAMBLE_PATTERN_01:    val = 0x55; break;
3221         case HDLC_PREAMBLE_PATTERN_ONES:  val = 0xff; break;
3222         }
3223         write_reg(info, CHA + PRE, val);
3224
3225         /* CCR4
3226          *
3227          * 07      MCK4 Master Clock Divide by 4, 1=enabled
3228          * 06      EBRG Enhanced Baud Rate Generator Mode, 1=enabled
3229          * 05      TST1 Test Pin, 0=normal operation
3230          * 04      ICD Ivert Carrier Detect, 1=enabled (active low)
3231          * 03..02  Reserved, must be 0
3232          * 01..00  RFT[1..0] RxFIFO Threshold 00=32 bytes
3233          *
3234          * 0101 0000
3235          */
3236         val = 0x50;
3237         write_reg(info, CHA + CCR4, val);
3238         if (info->params.flags & HDLC_FLAG_RXC_DPLL)
3239                 mgslpc_set_rate(info, CHA, info->params.clock_speed * 16);
3240         else
3241                 mgslpc_set_rate(info, CHA, info->params.clock_speed);
3242
3243         /* RLCR Receive length check register
3244          *
3245          * 7     1=enable receive length check
3246          * 6..0  Max frame length = (RL + 1) * 32
3247          */
3248         write_reg(info, CHA + RLCR, 0);
3249
3250         /* XBCH Transmit Byte Count High
3251          *
3252          * 07      DMA mode, 0 = interrupt driven
3253          * 06      NRM, 0=ABM (ignored)
3254          * 05      CAS Carrier Auto Start
3255          * 04      XC Transmit Continuously (ignored)
3256          * 03..00  XBC[10..8] Transmit byte count bits 10..8
3257          *
3258          * 0000 0000
3259          */
3260         val = 0x00;
3261         if (info->params.flags & HDLC_FLAG_AUTO_DCD)
3262                 val |= BIT5;
3263         write_reg(info, CHA + XBCH, val);
3264         enable_auxclk(info);
3265         if (info->params.loopback || info->testing_irq)
3266                 loopback_enable(info);
3267         if (info->params.flags & HDLC_FLAG_AUTO_CTS)
3268         {
3269                 irq_enable(info, CHB, IRQ_CTS);
3270                 /* PVR[3] 1=AUTO CTS active */
3271                 set_reg_bits(info, CHA + PVR, BIT3);
3272         } else
3273                 clear_reg_bits(info, CHA + PVR, BIT3);
3274
3275         irq_enable(info, CHA,
3276                          IRQ_RXEOM + IRQ_RXFIFO + IRQ_ALLSENT +
3277                          IRQ_UNDERRUN + IRQ_TXFIFO);
3278         issue_command(info, CHA, CMD_TXRESET + CMD_RXRESET);
3279         wait_command_complete(info, CHA);
3280         read_reg16(info, CHA + ISR);    /* clear pending IRQs */
3281
3282         /* Master clock mode enabled above to allow reset commands
3283          * to complete even if no data clocks are present.
3284          *
3285          * Disable master clock mode for normal communications because
3286          * V3.2 of the ESCC2 has a bug that prevents the transmit all sent
3287          * IRQ when in master clock mode.
3288          *
3289          * Leave master clock mode enabled for IRQ test because the
3290          * timer IRQ used by the test can only happen in master clock mode.
3291          */
3292         if (!info->testing_irq)
3293                 clear_reg_bits(info, CHA + CCR0, BIT6);
3294
3295         tx_set_idle(info);
3296
3297         tx_stop(info);
3298         rx_stop(info);
3299 }
3300
3301 static void rx_stop(MGSLPC_INFO *info)
3302 {
3303         if (debug_level >= DEBUG_LEVEL_ISR)
3304                 printk("%s(%d):rx_stop(%s)\n",
3305                          __FILE__,__LINE__, info->device_name );
3306
3307         /* MODE:03 RAC Receiver Active, 0=inactive */
3308         clear_reg_bits(info, CHA + MODE, BIT3);
3309
3310         info->rx_enabled = false;
3311         info->rx_overflow = false;
3312 }
3313
3314 static void rx_start(MGSLPC_INFO *info)
3315 {
3316         if (debug_level >= DEBUG_LEVEL_ISR)
3317                 printk("%s(%d):rx_start(%s)\n",
3318                          __FILE__,__LINE__, info->device_name );
3319
3320         rx_reset_buffers(info);
3321         info->rx_enabled = false;
3322         info->rx_overflow = false;
3323
3324         /* MODE:03 RAC Receiver Active, 1=active */
3325         set_reg_bits(info, CHA + MODE, BIT3);
3326
3327         info->rx_enabled = true;
3328 }
3329
3330 static void tx_start(MGSLPC_INFO *info, struct tty_struct *tty)
3331 {
3332         if (debug_level >= DEBUG_LEVEL_ISR)
3333                 printk("%s(%d):tx_start(%s)\n",
3334                          __FILE__,__LINE__, info->device_name );
3335
3336         if (info->tx_count) {
3337                 /* If auto RTS enabled and RTS is inactive, then assert */
3338                 /* RTS and set a flag indicating that the driver should */
3339                 /* negate RTS when the transmission completes. */
3340                 info->drop_rts_on_tx_done = false;
3341
3342                 if (info->params.flags & HDLC_FLAG_AUTO_RTS) {
3343                         get_signals(info);
3344                         if (!(info->serial_signals & SerialSignal_RTS)) {
3345                                 info->serial_signals |= SerialSignal_RTS;
3346                                 set_signals(info);
3347                                 info->drop_rts_on_tx_done = true;
3348                         }
3349                 }
3350
3351                 if (info->params.mode == MGSL_MODE_ASYNC) {
3352                         if (!info->tx_active) {
3353                                 info->tx_active = true;
3354                                 tx_ready(info, tty);
3355                         }
3356                 } else {
3357                         info->tx_active = true;
3358                         tx_ready(info, tty);
3359                         mod_timer(&info->tx_timer, jiffies +
3360                                         msecs_to_jiffies(5000));
3361                 }
3362         }
3363
3364         if (!info->tx_enabled)
3365                 info->tx_enabled = true;
3366 }
3367
3368 static void tx_stop(MGSLPC_INFO *info)
3369 {
3370         if (debug_level >= DEBUG_LEVEL_ISR)
3371                 printk("%s(%d):tx_stop(%s)\n",
3372                          __FILE__,__LINE__, info->device_name );
3373
3374         del_timer(&info->tx_timer);
3375
3376         info->tx_enabled = false;
3377         info->tx_active = false;
3378 }
3379
3380 /* Reset the adapter to a known state and prepare it for further use.
3381  */
3382 static void reset_device(MGSLPC_INFO *info)
3383 {
3384         /* power up both channels (set BIT7) */
3385         write_reg(info, CHA + CCR0, 0x80);
3386         write_reg(info, CHB + CCR0, 0x80);
3387         write_reg(info, CHA + MODE, 0);
3388         write_reg(info, CHB + MODE, 0);
3389
3390         /* disable all interrupts */
3391         irq_disable(info, CHA, 0xffff);
3392         irq_disable(info, CHB, 0xffff);
3393         port_irq_disable(info, 0xff);
3394
3395         /* PCR Port Configuration Register
3396          *
3397          * 07..04  DEC[3..0] Serial I/F select outputs
3398          * 03      output, 1=AUTO CTS control enabled
3399          * 02      RI Ring Indicator input 0=active
3400          * 01      DSR input 0=active
3401          * 00      DTR output 0=active
3402          *
3403          * 0000 0110
3404          */
3405         write_reg(info, PCR, 0x06);
3406
3407         /* PVR Port Value Register
3408          *
3409          * 07..04  DEC[3..0] Serial I/F select (0000=disabled)
3410          * 03      AUTO CTS output 1=enabled
3411          * 02      RI Ring Indicator input
3412          * 01      DSR input
3413          * 00      DTR output (1=inactive)
3414          *
3415          * 0000 0001
3416          */
3417 //      write_reg(info, PVR, PVR_DTR);
3418
3419         /* IPC Interrupt Port Configuration
3420          *
3421          * 07      VIS 1=Masked interrupts visible
3422          * 06..05  Reserved, 0
3423          * 04..03  SLA Slave address, 00 ignored
3424          * 02      CASM Cascading Mode, 1=daisy chain
3425          * 01..00  IC[1..0] Interrupt Config, 01=push-pull output, active low
3426          *
3427          * 0000 0101
3428          */
3429         write_reg(info, IPC, 0x05);
3430 }
3431
3432 static void async_mode(MGSLPC_INFO *info)
3433 {
3434         unsigned char val;
3435
3436         /* disable all interrupts */
3437         irq_disable(info, CHA, 0xffff);
3438         irq_disable(info, CHB, 0xffff);
3439         port_irq_disable(info, 0xff);
3440
3441         /* MODE
3442          *
3443          * 07      Reserved, 0
3444          * 06      FRTS RTS State, 0=active
3445          * 05      FCTS Flow Control on CTS
3446          * 04      FLON Flow Control Enable
3447          * 03      RAC Receiver Active, 0 = inactive
3448          * 02      RTS 0=Auto RTS, 1=manual RTS
3449          * 01      TRS Timer Resolution, 1=512
3450          * 00      TLP Test Loop, 0 = no loop
3451          *
3452          * 0000 0110
3453          */
3454         val = 0x06;
3455         if (info->params.loopback)
3456                 val |= BIT0;
3457
3458         /* preserve RTS state */
3459         if (!(info->serial_signals & SerialSignal_RTS))
3460                 val |= BIT6;
3461         write_reg(info, CHA + MODE, val);
3462
3463         /* CCR0
3464          *
3465          * 07      PU Power Up, 1=active, 0=power down
3466          * 06      MCE Master Clock Enable, 1=enabled
3467          * 05      Reserved, 0
3468          * 04..02  SC[2..0] Encoding, 000=NRZ
3469          * 01..00  SM[1..0] Serial Mode, 11=Async
3470          *
3471          * 1000 0011
3472          */
3473         write_reg(info, CHA + CCR0, 0x83);
3474
3475         /* CCR1
3476          *
3477          * 07..05  Reserved, 0
3478          * 04      ODS Output Driver Select, 1=TxD is push-pull output
3479          * 03      BCR Bit Clock Rate, 1=16x
3480          * 02..00  CM[2..0] Clock Mode, 111=BRG
3481          *
3482          * 0001 1111
3483          */
3484         write_reg(info, CHA + CCR1, 0x1f);
3485
3486         /* CCR2 (channel A)
3487          *
3488          * 07..06  BGR[9..8] Baud rate bits 9..8
3489          * 05      BDF Baud rate divisor factor, 0=1, 1=BGR value
3490          * 04      SSEL Clock source select, 1=submode b
3491          * 03      TOE 0=TxCLK is input, 0=TxCLK is input
3492          * 02      RWX Read/Write Exchange 0=disabled
3493          * 01      Reserved, 0
3494          * 00      DIV, data inversion 0=disabled, 1=enabled
3495          *
3496          * 0001 0000
3497          */
3498         write_reg(info, CHA + CCR2, 0x10);
3499
3500         /* CCR3
3501          *
3502          * 07..01  Reserved, 0
3503          * 00      PSD DPLL Phase Shift Disable
3504          *
3505          * 0000 0000
3506          */
3507         write_reg(info, CHA + CCR3, 0);
3508
3509         /* CCR4
3510          *
3511          * 07      MCK4 Master Clock Divide by 4, 1=enabled
3512          * 06      EBRG Enhanced Baud Rate Generator Mode, 1=enabled
3513          * 05      TST1 Test Pin, 0=normal operation
3514          * 04      ICD Ivert Carrier Detect, 1=enabled (active low)
3515          * 03..00  Reserved, must be 0
3516          *
3517          * 0101 0000
3518          */
3519         write_reg(info, CHA + CCR4, 0x50);
3520         mgslpc_set_rate(info, CHA, info->params.data_rate * 16);
3521
3522         /* DAFO Data Format
3523          *
3524          * 07      Reserved, 0
3525          * 06      XBRK transmit break, 0=normal operation
3526          * 05      Stop bits (0=1, 1=2)
3527          * 04..03  PAR[1..0] Parity (01=odd, 10=even)
3528          * 02      PAREN Parity Enable
3529          * 01..00  CHL[1..0] Character Length (00=8, 01=7)
3530          *
3531          */
3532         val = 0x00;
3533         if (info->params.data_bits != 8)
3534                 val |= BIT0;    /* 7 bits */
3535         if (info->params.stop_bits != 1)
3536                 val |= BIT5;
3537         if (info->params.parity != ASYNC_PARITY_NONE)
3538         {
3539                 val |= BIT2;    /* Parity enable */
3540                 if (info->params.parity == ASYNC_PARITY_ODD)
3541                         val |= BIT3;
3542                 else
3543                         val |= BIT4;
3544         }
3545         write_reg(info, CHA + DAFO, val);
3546
3547         /* RFC Rx FIFO Control
3548          *
3549          * 07      Reserved, 0
3550          * 06      DPS, 1=parity bit not stored in data byte
3551          * 05      DXS, 0=all data stored in FIFO (including XON/XOFF)
3552          * 04      RFDF Rx FIFO Data Format, 1=status byte stored in FIFO
3553          * 03..02  RFTH[1..0], rx threshold, 11=16 status + 16 data byte
3554          * 01      Reserved, 0
3555          * 00      TCDE Terminate Char Detect Enable, 0=disabled
3556          *
3557          * 0101 1100
3558          */
3559         write_reg(info, CHA + RFC, 0x5c);
3560
3561         /* RLCR Receive length check register
3562          *
3563          * Max frame length = (RL + 1) * 32
3564          */
3565         write_reg(info, CHA + RLCR, 0);
3566
3567         /* XBCH Transmit Byte Count High
3568          *
3569          * 07      DMA mode, 0 = interrupt driven
3570          * 06      NRM, 0=ABM (ignored)
3571          * 05      CAS Carrier Auto Start
3572          * 04      XC Transmit Continuously (ignored)
3573          * 03..00  XBC[10..8] Transmit byte count bits 10..8
3574          *
3575          * 0000 0000
3576          */
3577         val = 0x00;
3578         if (info->params.flags & HDLC_FLAG_AUTO_DCD)
3579                 val |= BIT5;
3580         write_reg(info, CHA + XBCH, val);
3581         if (info->params.flags & HDLC_FLAG_AUTO_CTS)
3582                 irq_enable(info, CHA, IRQ_CTS);
3583
3584         /* MODE:03 RAC Receiver Active, 1=active */
3585         set_reg_bits(info, CHA + MODE, BIT3);
3586         enable_auxclk(info);
3587         if (info->params.flags & HDLC_FLAG_AUTO_CTS) {
3588                 irq_enable(info, CHB, IRQ_CTS);
3589                 /* PVR[3] 1=AUTO CTS active */
3590                 set_reg_bits(info, CHA + PVR, BIT3);
3591         } else
3592                 clear_reg_bits(info, CHA + PVR, BIT3);
3593         irq_enable(info, CHA,
3594                           IRQ_RXEOM + IRQ_RXFIFO + IRQ_BREAK_ON + IRQ_RXTIME +
3595                           IRQ_ALLSENT + IRQ_TXFIFO);
3596         issue_command(info, CHA, CMD_TXRESET + CMD_RXRESET);
3597         wait_command_complete(info, CHA);
3598         read_reg16(info, CHA + ISR);    /* clear pending IRQs */
3599 }
3600
3601 /* Set the HDLC idle mode for the transmitter.
3602  */
3603 static void tx_set_idle(MGSLPC_INFO *info)
3604 {
3605         /* Note: ESCC2 only supports flags and one idle modes */
3606         if (info->idle_mode == HDLC_TXIDLE_FLAGS)
3607                 set_reg_bits(info, CHA + CCR1, BIT3);
3608         else
3609                 clear_reg_bits(info, CHA + CCR1, BIT3);
3610 }
3611
3612 /* get state of the V24 status (input) signals.
3613  */
3614 static void get_signals(MGSLPC_INFO *info)
3615 {
3616         unsigned char status = 0;
3617
3618         /* preserve DTR and RTS */
3619         info->serial_signals &= SerialSignal_DTR + SerialSignal_RTS;
3620
3621         if (read_reg(info, CHB + VSTR) & BIT7)
3622                 info->serial_signals |= SerialSignal_DCD;
3623         if (read_reg(info, CHB + STAR) & BIT1)
3624                 info->serial_signals |= SerialSignal_CTS;
3625
3626         status = read_reg(info, CHA + PVR);
3627         if (!(status & PVR_RI))
3628                 info->serial_signals |= SerialSignal_RI;
3629         if (!(status & PVR_DSR))
3630                 info->serial_signals |= SerialSignal_DSR;
3631 }
3632
3633 /* Set the state of DTR and RTS based on contents of
3634  * serial_signals member of device extension.
3635  */
3636 static void set_signals(MGSLPC_INFO *info)
3637 {
3638         unsigned char val;
3639
3640         val = read_reg(info, CHA + MODE);
3641         if (info->params.mode == MGSL_MODE_ASYNC) {
3642                 if (info->serial_signals & SerialSignal_RTS)
3643                         val &= ~BIT6;
3644                 else
3645                         val |= BIT6;
3646         } else {
3647                 if (info->serial_signals & SerialSignal_RTS)
3648                         val |= BIT2;
3649                 else
3650                         val &= ~BIT2;
3651         }
3652         write_reg(info, CHA + MODE, val);
3653
3654         if (info->serial_signals & SerialSignal_DTR)
3655                 clear_reg_bits(info, CHA + PVR, PVR_DTR);
3656         else
3657                 set_reg_bits(info, CHA + PVR, PVR_DTR);
3658 }
3659
3660 static void rx_reset_buffers(MGSLPC_INFO *info)
3661 {
3662         RXBUF *buf;
3663         int i;
3664
3665         info->rx_put = 0;
3666         info->rx_get = 0;
3667         info->rx_frame_count = 0;
3668         for (i=0 ; i < info->rx_buf_count ; i++) {
3669                 buf = (RXBUF*)(info->rx_buf + (i * info->rx_buf_size));
3670                 buf->status = buf->count = 0;
3671         }
3672 }
3673
3674 /* Attempt to return a received HDLC frame
3675  * Only frames received without errors are returned.
3676  *
3677  * Returns true if frame returned, otherwise false
3678  */
3679 static bool rx_get_frame(MGSLPC_INFO *info, struct tty_struct *tty)
3680 {
3681         unsigned short status;
3682         RXBUF *buf;
3683         unsigned int framesize = 0;
3684         unsigned long flags;
3685         bool return_frame = false;
3686
3687         if (info->rx_frame_count == 0)
3688                 return false;
3689
3690         buf = (RXBUF*)(info->rx_buf + (info->rx_get * info->rx_buf_size));
3691
3692         status = buf->status;
3693
3694         /* 07  VFR  1=valid frame
3695          * 06  RDO  1=data overrun
3696          * 05  CRC  1=OK, 0=error
3697          * 04  RAB  1=frame aborted
3698          */
3699         if ((status & 0xf0) != 0xA0) {
3700                 if (!(status & BIT7) || (status & BIT4))
3701                         info->icount.rxabort++;
3702                 else if (status & BIT6)
3703                         info->icount.rxover++;
3704                 else if (!(status & BIT5)) {
3705                         info->icount.rxcrc++;
3706                         if (info->params.crc_type & HDLC_CRC_RETURN_EX)
3707                                 return_frame = true;
3708                 }
3709                 framesize = 0;
3710 #if SYNCLINK_GENERIC_HDLC
3711                 {
3712                         info->netdev->stats.rx_errors++;
3713                         info->netdev->stats.rx_frame_errors++;
3714                 }
3715 #endif
3716         } else
3717                 return_frame = true;
3718
3719         if (return_frame)
3720                 framesize = buf->count;
3721
3722         if (debug_level >= DEBUG_LEVEL_BH)
3723                 printk("%s(%d):rx_get_frame(%s) status=%04X size=%d\n",
3724                         __FILE__,__LINE__,info->device_name,status,framesize);
3725
3726         if (debug_level >= DEBUG_LEVEL_DATA)
3727                 trace_block(info, buf->data, framesize, 0);
3728
3729         if (framesize) {
3730                 if ((info->params.crc_type & HDLC_CRC_RETURN_EX &&
3731                       framesize+1 > info->max_frame_size) ||
3732                     framesize > info->max_frame_size)
3733                         info->icount.rxlong++;
3734                 else {
3735                         if (status & BIT5)
3736                                 info->icount.rxok++;
3737
3738                         if (info->params.crc_type & HDLC_CRC_RETURN_EX) {
3739                                 *(buf->data + framesize) = status & BIT5 ? RX_OK:RX_CRC_ERROR;
3740                                 ++framesize;
3741                         }
3742
3743 #if SYNCLINK_GENERIC_HDLC
3744                         if (info->netcount)
3745                                 hdlcdev_rx(info, buf->data, framesize);
3746                         else
3747 #endif
3748                                 ldisc_receive_buf(tty, buf->data, info->flag_buf, framesize);
3749                 }
3750         }
3751
3752         spin_lock_irqsave(&info->lock,flags);
3753         buf->status = buf->count = 0;
3754         info->rx_frame_count--;
3755         info->rx_get++;
3756         if (info->rx_get >= info->rx_buf_count)
3757                 info->rx_get = 0;
3758         spin_unlock_irqrestore(&info->lock,flags);
3759
3760         return true;
3761 }
3762
3763 static bool register_test(MGSLPC_INFO *info)
3764 {
3765         static unsigned char patterns[] =
3766             { 0x00, 0xff, 0xaa, 0x55, 0x69, 0x96, 0x0f };
3767         static unsigned int count = ARRAY_SIZE(patterns);
3768         unsigned int i;
3769         bool rc = true;
3770         unsigned long flags;
3771
3772         spin_lock_irqsave(&info->lock,flags);
3773         reset_device(info);
3774
3775         for (i = 0; i < count; i++) {
3776                 write_reg(info, XAD1, patterns[i]);
3777                 write_reg(info, XAD2, patterns[(i + 1) % count]);
3778                 if ((read_reg(info, XAD1) != patterns[i]) ||
3779                     (read_reg(info, XAD2) != patterns[(i + 1) % count])) {
3780                         rc = false;
3781                         break;
3782                 }
3783         }
3784
3785         spin_unlock_irqrestore(&info->lock,flags);
3786         return rc;
3787 }
3788
3789 static bool irq_test(MGSLPC_INFO *info)
3790 {
3791         unsigned long end_time;
3792         unsigned long flags;
3793
3794         spin_lock_irqsave(&info->lock,flags);
3795         reset_device(info);
3796
3797         info->testing_irq = true;
3798         hdlc_mode(info);
3799
3800         info->irq_occurred = false;
3801
3802         /* init hdlc mode */
3803
3804         irq_enable(info, CHA, IRQ_TIMER);
3805         write_reg(info, CHA + TIMR, 0); /* 512 cycles */
3806         issue_command(info, CHA, CMD_START_TIMER);
3807
3808         spin_unlock_irqrestore(&info->lock,flags);
3809
3810         end_time=100;
3811         while(end_time-- && !info->irq_occurred) {
3812                 msleep_interruptible(10);
3813         }
3814
3815         info->testing_irq = false;
3816
3817         spin_lock_irqsave(&info->lock,flags);
3818         reset_device(info);
3819         spin_unlock_irqrestore(&info->lock,flags);
3820
3821         return info->irq_occurred;
3822 }
3823
3824 static int adapter_test(MGSLPC_INFO *info)
3825 {
3826         if (!register_test(info)) {
3827                 info->init_error = DiagStatus_AddressFailure;
3828                 printk( "%s(%d):Register test failure for device %s Addr=%04X\n",
3829                         __FILE__,__LINE__,info->device_name, (unsigned short)(info->io_base) );
3830                 return -ENODEV;
3831         }
3832
3833         if (!irq_test(info)) {
3834                 info->init_error = DiagStatus_IrqFailure;
3835                 printk( "%s(%d):Interrupt test failure for device %s IRQ=%d\n",
3836                         __FILE__,__LINE__,info->device_name, (unsigned short)(info->irq_level) );
3837                 return -ENODEV;
3838         }
3839
3840         if (debug_level >= DEBUG_LEVEL_INFO)
3841                 printk("%s(%d):device %s passed diagnostics\n",
3842                         __FILE__,__LINE__,info->device_name);
3843         return 0;
3844 }
3845
3846 static void trace_block(MGSLPC_INFO *info,const char* data, int count, int xmit)
3847 {
3848         int i;
3849         int linecount;
3850         if (xmit)
3851                 printk("%s tx data:\n",info->device_name);
3852         else
3853                 printk("%s rx data:\n",info->device_name);
3854
3855         while(count) {
3856                 if (count > 16)
3857                         linecount = 16;
3858                 else
3859                         linecount = count;
3860
3861                 for(i=0;i<linecount;i++)
3862                         printk("%02X ",(unsigned char)data[i]);
3863                 for(;i<17;i++)
3864                         printk("   ");
3865                 for(i=0;i<linecount;i++) {
3866                         if (data[i]>=040 && data[i]<=0176)
3867                                 printk("%c",data[i]);
3868                         else
3869                                 printk(".");
3870                 }
3871                 printk("\n");
3872
3873                 data  += linecount;
3874                 count -= linecount;
3875         }
3876 }
3877
3878 /* HDLC frame time out
3879  * update stats and do tx completion processing
3880  */
3881 static void tx_timeout(unsigned long context)
3882 {
3883         MGSLPC_INFO *info = (MGSLPC_INFO*)context;
3884         unsigned long flags;
3885
3886         if ( debug_level >= DEBUG_LEVEL_INFO )
3887                 printk( "%s(%d):tx_timeout(%s)\n",
3888                         __FILE__,__LINE__,info->device_name);
3889         if(info->tx_active &&
3890            info->params.mode == MGSL_MODE_HDLC) {
3891                 info->icount.txtimeout++;
3892         }
3893         spin_lock_irqsave(&info->lock,flags);
3894         info->tx_active = false;
3895         info->tx_count = info->tx_put = info->tx_get = 0;
3896
3897         spin_unlock_irqrestore(&info->lock,flags);
3898
3899 #if SYNCLINK_GENERIC_HDLC
3900         if (info->netcount)
3901                 hdlcdev_tx_done(info);
3902         else
3903 #endif
3904         {
3905                 struct tty_struct *tty = tty_port_tty_get(&info->port);
3906                 bh_transmit(info, tty);
3907                 tty_kref_put(tty);
3908         }
3909 }
3910
3911 #if SYNCLINK_GENERIC_HDLC
3912
3913 /**
3914  * called by generic HDLC layer when protocol selected (PPP, frame relay, etc.)
3915  * set encoding and frame check sequence (FCS) options
3916  *
3917  * dev       pointer to network device structure
3918  * encoding  serial encoding setting
3919  * parity    FCS setting
3920  *
3921  * returns 0 if success, otherwise error code
3922  */
3923 static int hdlcdev_attach(struct net_device *dev, unsigned short encoding,
3924                           unsigned short parity)
3925 {
3926         MGSLPC_INFO *info = dev_to_port(dev);
3927         struct tty_struct *tty;
3928         unsigned char  new_encoding;
3929         unsigned short new_crctype;
3930
3931         /* return error if TTY interface open */
3932         if (info->port.count)
3933                 return -EBUSY;
3934
3935         switch (encoding)
3936         {
3937         case ENCODING_NRZ:        new_encoding = HDLC_ENCODING_NRZ; break;
3938         case ENCODING_NRZI:       new_encoding = HDLC_ENCODING_NRZI_SPACE; break;
3939         case ENCODING_FM_MARK:    new_encoding = HDLC_ENCODING_BIPHASE_MARK; break;
3940         case ENCODING_FM_SPACE:   new_encoding = HDLC_ENCODING_BIPHASE_SPACE; break;
3941         case ENCODING_MANCHESTER: new_encoding = HDLC_ENCODING_BIPHASE_LEVEL; break;
3942         default: return -EINVAL;
3943         }
3944
3945         switch (parity)
3946         {
3947         case PARITY_NONE:            new_crctype = HDLC_CRC_NONE; break;
3948         case PARITY_CRC16_PR1_CCITT: new_crctype = HDLC_CRC_16_CCITT; break;
3949         case PARITY_CRC32_PR1_CCITT: new_crctype = HDLC_CRC_32_CCITT; break;
3950         default: return -EINVAL;
3951         }
3952
3953         info->params.encoding = new_encoding;
3954         info->params.crc_type = new_crctype;
3955
3956         /* if network interface up, reprogram hardware */
3957         if (info->netcount) {
3958                 tty = tty_port_tty_get(&info->port);
3959                 mgslpc_program_hw(info, tty);
3960                 tty_kref_put(tty);
3961         }
3962
3963         return 0;
3964 }
3965
3966 /**
3967  * called by generic HDLC layer to send frame
3968  *
3969  * skb  socket buffer containing HDLC frame
3970  * dev  pointer to network device structure
3971  */
3972 static netdev_tx_t hdlcdev_xmit(struct sk_buff *skb,
3973                                       struct net_device *dev)
3974 {
3975         MGSLPC_INFO *info = dev_to_port(dev);
3976         unsigned long flags;
3977
3978         if (debug_level >= DEBUG_LEVEL_INFO)
3979                 printk(KERN_INFO "%s:hdlc_xmit(%s)\n",__FILE__,dev->name);
3980
3981         /* stop sending until this frame completes */
3982         netif_stop_queue(dev);
3983
3984         /* copy data to device buffers */
3985         skb_copy_from_linear_data(skb, info->tx_buf, skb->len);
3986         info->tx_get = 0;
3987         info->tx_put = info->tx_count = skb->len;
3988
3989         /* update network statistics */
3990         dev->stats.tx_packets++;
3991         dev->stats.tx_bytes += skb->len;
3992
3993         /* done with socket buffer, so free it */
3994         dev_kfree_skb(skb);
3995
3996         /* save start time for transmit timeout detection */
3997         dev->trans_start = jiffies;
3998
3999         /* start hardware transmitter if necessary */
4000         spin_lock_irqsave(&info->lock,flags);
4001         if (!info->tx_active) {
4002                 struct tty_struct *tty = tty_port_tty_get(&info->port);
4003                 tx_start(info, tty);
4004                 tty_kref_put(tty);
4005         }
4006         spin_unlock_irqrestore(&info->lock,flags);
4007
4008         return NETDEV_TX_OK;
4009 }
4010
4011 /**
4012  * called by network layer when interface enabled
4013  * claim resources and initialize hardware
4014  *
4015  * dev  pointer to network device structure
4016  *
4017  * returns 0 if success, otherwise error code
4018  */
4019 static int hdlcdev_open(struct net_device *dev)
4020 {
4021         MGSLPC_INFO *info = dev_to_port(dev);
4022         struct tty_struct *tty;
4023         int rc;
4024         unsigned long flags;
4025
4026         if (debug_level >= DEBUG_LEVEL_INFO)
4027                 printk("%s:hdlcdev_open(%s)\n",__FILE__,dev->name);
4028
4029         /* generic HDLC layer open processing */
4030         if ((rc = hdlc_open(dev)))
4031                 return rc;
4032
4033         /* arbitrate between network and tty opens */
4034         spin_lock_irqsave(&info->netlock, flags);
4035         if (info->port.count != 0 || info->netcount != 0) {
4036                 printk(KERN_WARNING "%s: hdlc_open returning busy\n", dev->name);
4037                 spin_unlock_irqrestore(&info->netlock, flags);
4038                 return -EBUSY;
4039         }
4040         info->netcount=1;
4041         spin_unlock_irqrestore(&info->netlock, flags);
4042
4043         tty = tty_port_tty_get(&info->port);
4044         /* claim resources and init adapter */
4045         if ((rc = startup(info, tty)) != 0) {
4046                 tty_kref_put(tty);
4047                 spin_lock_irqsave(&info->netlock, flags);
4048                 info->netcount=0;
4049                 spin_unlock_irqrestore(&info->netlock, flags);
4050                 return rc;
4051         }
4052         /* assert DTR and RTS, apply hardware settings */
4053         info->serial_signals |= SerialSignal_RTS + SerialSignal_DTR;
4054         mgslpc_program_hw(info, tty);
4055         tty_kref_put(tty);
4056
4057         /* enable network layer transmit */
4058         dev->trans_start = jiffies;
4059         netif_start_queue(dev);
4060
4061         /* inform generic HDLC layer of current DCD status */
4062         spin_lock_irqsave(&info->lock, flags);
4063         get_signals(info);
4064         spin_unlock_irqrestore(&info->lock, flags);
4065         if (info->serial_signals & SerialSignal_DCD)
4066                 netif_carrier_on(dev);
4067         else
4068                 netif_carrier_off(dev);
4069         return 0;
4070 }
4071
4072 /**
4073  * called by network layer when interface is disabled
4074  * shutdown hardware and release resources
4075  *
4076  * dev  pointer to network device structure
4077  *
4078  * returns 0 if success, otherwise error code
4079  */
4080 static int hdlcdev_close(struct net_device *dev)
4081 {
4082         MGSLPC_INFO *info = dev_to_port(dev);
4083         struct tty_struct *tty = tty_port_tty_get(&info->port);
4084         unsigned long flags;
4085
4086         if (debug_level >= DEBUG_LEVEL_INFO)
4087                 printk("%s:hdlcdev_close(%s)\n",__FILE__,dev->name);
4088
4089         netif_stop_queue(dev);
4090
4091         /* shutdown adapter and release resources */
4092         shutdown(info, tty);
4093         tty_kref_put(tty);
4094         hdlc_close(dev);
4095
4096         spin_lock_irqsave(&info->netlock, flags);
4097         info->netcount=0;
4098         spin_unlock_irqrestore(&info->netlock, flags);
4099
4100         return 0;
4101 }
4102
4103 /**
4104  * called by network layer to process IOCTL call to network device
4105  *
4106  * dev  pointer to network device structure
4107  * ifr  pointer to network interface request structure
4108  * cmd  IOCTL command code
4109  *
4110  * returns 0 if success, otherwise error code
4111  */
4112 static int hdlcdev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
4113 {
4114         const size_t size = sizeof(sync_serial_settings);
4115         sync_serial_settings new_line;
4116         sync_serial_settings __user *line = ifr->ifr_settings.ifs_ifsu.sync;
4117         MGSLPC_INFO *info = dev_to_port(dev);
4118         unsigned int flags;
4119
4120         if (debug_level >= DEBUG_LEVEL_INFO)
4121                 printk("%s:hdlcdev_ioctl(%s)\n",__FILE__,dev->name);
4122
4123         /* return error if TTY interface open */
4124         if (info->port.count)
4125                 return -EBUSY;
4126
4127         if (cmd != SIOCWANDEV)
4128                 return hdlc_ioctl(dev, ifr, cmd);
4129
4130         switch(ifr->ifr_settings.type) {
4131         case IF_GET_IFACE: /* return current sync_serial_settings */
4132
4133                 ifr->ifr_settings.type = IF_IFACE_SYNC_SERIAL;
4134                 if (ifr->ifr_settings.size < size) {
4135                         ifr->ifr_settings.size = size; /* data size wanted */
4136                         return -ENOBUFS;
4137                 }
4138
4139                 flags = info->params.flags & (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
4140                                               HDLC_FLAG_RXC_BRG    | HDLC_FLAG_RXC_TXCPIN |
4141                                               HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
4142                                               HDLC_FLAG_TXC_BRG    | HDLC_FLAG_TXC_RXCPIN);
4143
4144                 switch (flags){
4145                 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN): new_line.clock_type = CLOCK_EXT; break;
4146                 case (HDLC_FLAG_RXC_BRG    | HDLC_FLAG_TXC_BRG):    new_line.clock_type = CLOCK_INT; break;
4147                 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG):    new_line.clock_type = CLOCK_TXINT; break;
4148                 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN): new_line.clock_type = CLOCK_TXFROMRX; break;
4149                 default: new_line.clock_type = CLOCK_DEFAULT;
4150                 }
4151
4152                 new_line.clock_rate = info->params.clock_speed;
4153                 new_line.loopback   = info->params.loopback ? 1:0;
4154
4155                 if (copy_to_user(line, &new_line, size))
4156                         return -EFAULT;
4157                 return 0;
4158
4159         case IF_IFACE_SYNC_SERIAL: /* set sync_serial_settings */
4160
4161                 if(!capable(CAP_NET_ADMIN))
4162                         return -EPERM;
4163                 if (copy_from_user(&new_line, line, size))
4164                         return -EFAULT;
4165
4166                 switch (new_line.clock_type)
4167                 {
4168                 case CLOCK_EXT:      flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN; break;
4169                 case CLOCK_TXFROMRX: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN; break;
4170                 case CLOCK_INT:      flags = HDLC_FLAG_RXC_BRG    | HDLC_FLAG_TXC_BRG;    break;
4171                 case CLOCK_TXINT:    flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG;    break;
4172                 case CLOCK_DEFAULT:  flags = info->params.flags &
4173                                              (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
4174                                               HDLC_FLAG_RXC_BRG    | HDLC_FLAG_RXC_TXCPIN |
4175                                               HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
4176                                               HDLC_FLAG_TXC_BRG    | HDLC_FLAG_TXC_RXCPIN); break;
4177                 default: return -EINVAL;
4178                 }
4179
4180                 if (new_line.loopback != 0 && new_line.loopback != 1)
4181                         return -EINVAL;
4182
4183                 info->params.flags &= ~(HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
4184                                         HDLC_FLAG_RXC_BRG    | HDLC_FLAG_RXC_TXCPIN |
4185                                         HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
4186                                         HDLC_FLAG_TXC_BRG    | HDLC_FLAG_TXC_RXCPIN);
4187                 info->params.flags |= flags;
4188
4189                 info->params.loopback = new_line.loopback;
4190
4191                 if (flags & (HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG))
4192                         info->params.clock_speed = new_line.clock_rate;
4193                 else
4194                         info->params.clock_speed = 0;
4195
4196                 /* if network interface up, reprogram hardware */
4197                 if (info->netcount) {
4198                         struct tty_struct *tty = tty_port_tty_get(&info->port);
4199                         mgslpc_program_hw(info, tty);
4200                         tty_kref_put(tty);
4201                 }
4202                 return 0;
4203
4204         default:
4205                 return hdlc_ioctl(dev, ifr, cmd);
4206         }
4207 }
4208
4209 /**
4210  * called by network layer when transmit timeout is detected
4211  *
4212  * dev  pointer to network device structure
4213  */
4214 static void hdlcdev_tx_timeout(struct net_device *dev)
4215 {
4216         MGSLPC_INFO *info = dev_to_port(dev);
4217         unsigned long flags;
4218
4219         if (debug_level >= DEBUG_LEVEL_INFO)
4220                 printk("hdlcdev_tx_timeout(%s)\n",dev->name);
4221
4222         dev->stats.tx_errors++;
4223         dev->stats.tx_aborted_errors++;
4224
4225         spin_lock_irqsave(&info->lock,flags);
4226         tx_stop(info);
4227         spin_unlock_irqrestore(&info->lock,flags);
4228
4229         netif_wake_queue(dev);
4230 }
4231
4232 /**
4233  * called by device driver when transmit completes
4234  * reenable network layer transmit if stopped
4235  *
4236  * info  pointer to device instance information
4237  */
4238 static void hdlcdev_tx_done(MGSLPC_INFO *info)
4239 {
4240         if (netif_queue_stopped(info->netdev))
4241                 netif_wake_queue(info->netdev);
4242 }
4243
4244 /**
4245  * called by device driver when frame received
4246  * pass frame to network layer
4247  *
4248  * info  pointer to device instance information
4249  * buf   pointer to buffer contianing frame data
4250  * size  count of data bytes in buf
4251  */
4252 static void hdlcdev_rx(MGSLPC_INFO *info, char *buf, int size)
4253 {
4254         struct sk_buff *skb = dev_alloc_skb(size);
4255         struct net_device *dev = info->netdev;
4256
4257         if (debug_level >= DEBUG_LEVEL_INFO)
4258                 printk("hdlcdev_rx(%s)\n",dev->name);
4259
4260         if (skb == NULL) {
4261                 printk(KERN_NOTICE "%s: can't alloc skb, dropping packet\n", dev->name);
4262                 dev->stats.rx_dropped++;
4263                 return;
4264         }
4265
4266         memcpy(skb_put(skb, size), buf, size);
4267
4268         skb->protocol = hdlc_type_trans(skb, dev);
4269
4270         dev->stats.rx_packets++;
4271         dev->stats.rx_bytes += size;
4272
4273         netif_rx(skb);
4274 }
4275
4276 static const struct net_device_ops hdlcdev_ops = {
4277         .ndo_open       = hdlcdev_open,
4278         .ndo_stop       = hdlcdev_close,
4279         .ndo_change_mtu = hdlc_change_mtu,
4280         .ndo_start_xmit = hdlc_start_xmit,
4281         .ndo_do_ioctl   = hdlcdev_ioctl,
4282         .ndo_tx_timeout = hdlcdev_tx_timeout,
4283 };
4284
4285 /**
4286  * called by device driver when adding device instance
4287  * do generic HDLC initialization
4288  *
4289  * info  pointer to device instance information
4290  *
4291  * returns 0 if success, otherwise error code
4292  */
4293 static int hdlcdev_init(MGSLPC_INFO *info)
4294 {
4295         int rc;
4296         struct net_device *dev;
4297         hdlc_device *hdlc;
4298
4299         /* allocate and initialize network and HDLC layer objects */
4300
4301         if (!(dev = alloc_hdlcdev(info))) {
4302                 printk(KERN_ERR "%s:hdlc device allocation failure\n",__FILE__);
4303                 return -ENOMEM;
4304         }
4305
4306         /* for network layer reporting purposes only */
4307         dev->base_addr = info->io_base;
4308         dev->irq       = info->irq_level;
4309
4310         /* network layer callbacks and settings */
4311         dev->netdev_ops     = &hdlcdev_ops;
4312         dev->watchdog_timeo = 10 * HZ;
4313         dev->tx_queue_len   = 50;
4314
4315         /* generic HDLC layer callbacks and settings */
4316         hdlc         = dev_to_hdlc(dev);
4317         hdlc->attach = hdlcdev_attach;
4318         hdlc->xmit   = hdlcdev_xmit;
4319
4320         /* register objects with HDLC layer */
4321         if ((rc = register_hdlc_device(dev))) {
4322                 printk(KERN_WARNING "%s:unable to register hdlc device\n",__FILE__);
4323                 free_netdev(dev);
4324                 return rc;
4325         }
4326
4327         info->netdev = dev;
4328         return 0;
4329 }
4330
4331 /**
4332  * called by device driver when removing device instance
4333  * do generic HDLC cleanup
4334  *
4335  * info  pointer to device instance information
4336  */
4337 static void hdlcdev_exit(MGSLPC_INFO *info)
4338 {
4339         unregister_hdlc_device(info->netdev);
4340         free_netdev(info->netdev);
4341         info->netdev = NULL;
4342 }
4343
4344 #endif /* CONFIG_HDLC */
4345