git.oblomov.eu Git - linux-2.6/blob - 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/slab.h>
  55 #include <linux/netdevice.h>
  56 #include <linux/vmalloc.h>
  57 #include <linux/init.h>
  58 #include <linux/delay.h>
  59 #include <linux/ioctl.h>
  60
  61 #include <asm/system.h>
  62 #include <asm/io.h>
  63 #include <asm/irq.h>
  64 #include <asm/dma.h>
  65 #include <linux/bitops.h>
  66 #include <asm/types.h>
  67 #include <linux/termios.h>
  68 #include <linux/workqueue.h>
  69 #include <linux/hdlc.h>
  70
  71 #include <pcmcia/cs_types.h>
  72 #include <pcmcia/cs.h>
  73 #include <pcmcia/cistpl.h>
  74 #include <pcmcia/cisreg.h>
  75 #include <pcmcia/ds.h>
  76
  77 #if defined(CONFIG_HDLC) || (defined(CONFIG_HDLC_MODULE) && defined(CONFIG_SYNCLINK_CS_MODULE))
  78 #define SYNCLINK_GENERIC_HDLC 1
  79 #else
  80 #define SYNCLINK_GENERIC_HDLC 0
  81 #endif
  82
  83 #define GET_USER(error,value,addr) error = get_user(value,addr)
  84 #define COPY_FROM_USER(error,dest,src,size) error = copy_from_user(dest,src,size) ? -EFAULT : 0
  85 #define PUT_USER(error,value,addr) error = put_user(value,addr)
  86 #define COPY_TO_USER(error,dest,src,size) error = copy_to_user(dest,src,size) ? -EFAULT : 0
  87
  88 #include <asm/uaccess.h>
  89
  90 #include "linux/synclink.h"
  91
  92 static MGSL_PARAMS default_params = {
  93         MGSL_MODE_HDLC,                 /* unsigned long mode */
  94         0,                              /* unsigned char loopback; */
  95         HDLC_FLAG_UNDERRUN_ABORT15,     /* unsigned short flags; */
  96         HDLC_ENCODING_NRZI_SPACE,       /* unsigned char encoding; */
  97         0,                              /* unsigned long clock_speed; */
  98         0xff,                           /* unsigned char addr_filter; */
  99         HDLC_CRC_16_CCITT,              /* unsigned short crc_type; */
 100         HDLC_PREAMBLE_LENGTH_8BITS,     /* unsigned char preamble_length; */
 101         HDLC_PREAMBLE_PATTERN_NONE,     /* unsigned char preamble; */
 102         9600,                           /* unsigned long data_rate; */
 103         8,                              /* unsigned char data_bits; */
 104         1,                              /* unsigned char stop_bits; */
 105         ASYNC_PARITY_NONE               /* unsigned char parity; */
 106 };
 107
 108 typedef struct
 109 {
 110         int count;
 111         unsigned char status;
 112         char data[1];
 113 } RXBUF;
 114
 115 /* The queue of BH actions to be performed */
 116
 117 #define BH_RECEIVE  1
 118 #define BH_TRANSMIT 2
 119 #define BH_STATUS   4
 120
 121 #define IO_PIN_SHUTDOWN_LIMIT 100
 122
 123 #define RELEVANT_IFLAG(iflag) (iflag & (IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK))
 124
 125 struct _input_signal_events {
 126         int     ri_up;
 127         int     ri_down;
 128         int     dsr_up;
 129         int     dsr_down;
 130         int     dcd_up;
 131         int     dcd_down;
 132         int     cts_up;
 133         int     cts_down;
 134 };
 135
 136
 137 /*
 138  * Device instance data structure
 139  */
 140
 141 typedef struct _mgslpc_info {
 142         void *if_ptr;   /* General purpose pointer (used by SPPP) */
 143         int                     magic;
 144         int                     flags;
 145         int                     count;          /* count of opens */
 146         int                     line;
 147         unsigned short          close_delay;
 148         unsigned short          closing_wait;   /* time to wait before closing */
 149
 150         struct mgsl_icount      icount;
 151
 152         struct tty_struct       *tty;
 153         int                     timeout;
 154         int                     x_char;         /* xon/xoff character */
 155         int                     blocked_open;   /* # of blocked opens */
 156         unsigned char           read_status_mask;
 157         unsigned char           ignore_status_mask;
 158
 159         unsigned char *tx_buf;
 160         int            tx_put;
 161         int            tx_get;
 162         int            tx_count;
 163
 164         /* circular list of fixed length rx buffers */
 165
 166         unsigned char  *rx_buf;        /* memory allocated for all rx buffers */
 167         int            rx_buf_total_size; /* size of memory allocated for rx buffers */
 168         int            rx_put;         /* index of next empty rx buffer */
 169         int            rx_get;         /* index of next full rx buffer */
 170         int            rx_buf_size;    /* size in bytes of single rx buffer */
 171         int            rx_buf_count;   /* total number of rx buffers */
 172         int            rx_frame_count; /* number of full rx buffers */
 173
 174         wait_queue_head_t       open_wait;
 175         wait_queue_head_t       close_wait;
 176
 177         wait_queue_head_t       status_event_wait_q;
 178         wait_queue_head_t       event_wait_q;
 179         struct timer_list       tx_timer;       /* HDLC transmit timeout timer */
 180         struct _mgslpc_info     *next_device;   /* device list link */
 181
 182         unsigned short imra_value;
 183         unsigned short imrb_value;
 184         unsigned char  pim_value;
 185
 186         spinlock_t lock;
 187         struct work_struct task;                /* task structure for scheduling bh */
 188
 189         u32 max_frame_size;
 190
 191         u32 pending_bh;
 192
 193         int bh_running;
 194         int bh_requested;
 195
 196         int dcd_chkcount; /* check counts to prevent */
 197         int cts_chkcount; /* too many IRQs if a signal */
 198         int dsr_chkcount; /* is floating */
 199         int ri_chkcount;
 200
 201         int rx_enabled;
 202         int rx_overflow;
 203
 204         int tx_enabled;
 205         int tx_active;
 206         int tx_aborting;
 207         u32 idle_mode;
 208
 209         int if_mode; /* serial interface selection (RS-232, v.35 etc) */
 210
 211         char device_name[25];           /* device instance name */
 212
 213         unsigned int io_base;   /* base I/O address of adapter */
 214         unsigned int irq_level;
 215
 216         MGSL_PARAMS params;             /* communications parameters */
 217
 218         unsigned char serial_signals;   /* current serial signal states */
 219
 220         char irq_occurred;              /* for diagnostics use */
 221         char testing_irq;
 222         unsigned int init_error;        /* startup error (DIAGS)        */
 223
 224         char flag_buf[MAX_ASYNC_BUFFER_SIZE];
 225         BOOLEAN drop_rts_on_tx_done;
 226
 227         struct  _input_signal_events    input_signal_events;
 228
 229         /* PCMCIA support */
 230         struct pcmcia_device    *p_dev;
 231         dev_node_t            node;
 232         int                   stop;
 233
 234         /* SPPP/Cisco HDLC device parts */
 235         int netcount;
 236         int dosyncppp;
 237         spinlock_t netlock;
 238
 239 #if SYNCLINK_GENERIC_HDLC
 240         struct net_device *netdev;
 241 #endif
 242
 243 } MGSLPC_INFO;
 244
 245 #define MGSLPC_MAGIC 0x5402
 246
 247 /*
 248  * The size of the serial xmit buffer is 1 page, or 4096 bytes
 249  */
 250 #define TXBUFSIZE 4096
 251
 252
 253 #define CHA     0x00   /* channel A offset */
 254 #define CHB     0x40   /* channel B offset */
 255
 256 /*
 257  *  FIXME: PPC has PVR defined in asm/reg.h.  For now we just undef it.
 258  */
 259 #undef PVR
 260
 261 #define RXFIFO  0
 262 #define TXFIFO  0
 263 #define STAR    0x20
 264 #define CMDR    0x20
 265 #define RSTA    0x21
 266 #define PRE     0x21
 267 #define MODE    0x22
 268 #define TIMR    0x23
 269 #define XAD1    0x24
 270 #define XAD2    0x25
 271 #define RAH1    0x26
 272 #define RAH2    0x27
 273 #define DAFO    0x27
 274 #define RAL1    0x28
 275 #define RFC     0x28
 276 #define RHCR    0x29
 277 #define RAL2    0x29
 278 #define RBCL    0x2a
 279 #define XBCL    0x2a
 280 #define RBCH    0x2b
 281 #define XBCH    0x2b
 282 #define CCR0    0x2c
 283 #define CCR1    0x2d
 284 #define CCR2    0x2e
 285 #define CCR3    0x2f
 286 #define VSTR    0x34
 287 #define BGR     0x34
 288 #define RLCR    0x35
 289 #define AML     0x36
 290 #define AMH     0x37
 291 #define GIS     0x38
 292 #define IVA     0x38
 293 #define IPC     0x39
 294 #define ISR     0x3a
 295 #define IMR     0x3a
 296 #define PVR     0x3c
 297 #define PIS     0x3d
 298 #define PIM     0x3d
 299 #define PCR     0x3e
 300 #define CCR4    0x3f
 301
 302 // IMR/ISR
 303
 304 #define IRQ_BREAK_ON    BIT15   // rx break detected
 305 #define IRQ_DATAOVERRUN BIT14   // receive data overflow
 306 #define IRQ_ALLSENT     BIT13   // all sent
 307 #define IRQ_UNDERRUN    BIT12   // transmit data underrun
 308 #define IRQ_TIMER       BIT11   // timer interrupt
 309 #define IRQ_CTS         BIT10   // CTS status change
 310 #define IRQ_TXREPEAT    BIT9    // tx message repeat
 311 #define IRQ_TXFIFO      BIT8    // transmit pool ready
 312 #define IRQ_RXEOM       BIT7    // receive message end
 313 #define IRQ_EXITHUNT    BIT6    // receive frame start
 314 #define IRQ_RXTIME      BIT6    // rx char timeout
 315 #define IRQ_DCD         BIT2    // carrier detect status change
 316 #define IRQ_OVERRUN     BIT1    // receive frame overflow
 317 #define IRQ_RXFIFO      BIT0    // receive pool full
 318
 319 // STAR
 320
 321 #define XFW   BIT6              // transmit FIFO write enable
 322 #define CEC   BIT2              // command executing
 323 #define CTS   BIT1              // CTS state
 324
 325 #define PVR_DTR      BIT0
 326 #define PVR_DSR      BIT1
 327 #define PVR_RI       BIT2
 328 #define PVR_AUTOCTS  BIT3
 329 #define PVR_RS232    0x20   /* 0010b */
 330 #define PVR_V35      0xe0   /* 1110b */
 331 #define PVR_RS422    0x40   /* 0100b */
 332
 333 /* Register access functions */
 334
 335 #define write_reg(info, reg, val) outb((val),(info)->io_base + (reg))
 336 #define read_reg(info, reg) inb((info)->io_base + (reg))
 337
 338 #define read_reg16(info, reg) inw((info)->io_base + (reg))
 339 #define write_reg16(info, reg, val) outw((val), (info)->io_base + (reg))
 340
 341 #define set_reg_bits(info, reg, mask) \
 342     write_reg(info, (reg), \
 343                  (unsigned char) (read_reg(info, (reg)) | (mask)))
 344 #define clear_reg_bits(info, reg, mask) \
 345     write_reg(info, (reg), \
 346                  (unsigned char) (read_reg(info, (reg)) & ~(mask)))
 347 /*
 348  * interrupt enable/disable routines
 349  */
 350 static void irq_disable(MGSLPC_INFO *info, unsigned char channel, unsigned short mask)
 351 {
 352         if (channel == CHA) {
 353                 info->imra_value |= mask;
 354                 write_reg16(info, CHA + IMR, info->imra_value);
 355         } else {
 356                 info->imrb_value |= mask;
 357                 write_reg16(info, CHB + IMR, info->imrb_value);
 358         }
 359 }
 360 static void irq_enable(MGSLPC_INFO *info, unsigned char channel, unsigned short mask)
 361 {
 362         if (channel == CHA) {
 363                 info->imra_value &= ~mask;
 364                 write_reg16(info, CHA + IMR, info->imra_value);
 365         } else {
 366                 info->imrb_value &= ~mask;
 367                 write_reg16(info, CHB + IMR, info->imrb_value);
 368         }
 369 }
 370
 371 #define port_irq_disable(info, mask) \
 372   { info->pim_value |= (mask); write_reg(info, PIM, info->pim_value); }
 373
 374 #define port_irq_enable(info, mask) \
 375   { info->pim_value &= ~(mask); write_reg(info, PIM, info->pim_value); }
 376
 377 static void rx_start(MGSLPC_INFO *info);
 378 static void rx_stop(MGSLPC_INFO *info);
 379
 380 static void tx_start(MGSLPC_INFO *info);
 381 static void tx_stop(MGSLPC_INFO *info);
 382 static void tx_set_idle(MGSLPC_INFO *info);
 383
 384 static void get_signals(MGSLPC_INFO *info);
 385 static void set_signals(MGSLPC_INFO *info);
 386
 387 static void reset_device(MGSLPC_INFO *info);
 388
 389 static void hdlc_mode(MGSLPC_INFO *info);
 390 static void async_mode(MGSLPC_INFO *info);
 391
 392 static void tx_timeout(unsigned long context);
 393
 394 static int ioctl_common(MGSLPC_INFO *info, unsigned int cmd, unsigned long arg);
 395
 396 #if SYNCLINK_GENERIC_HDLC
 397 #define dev_to_port(D) (dev_to_hdlc(D)->priv)
 398 static void hdlcdev_tx_done(MGSLPC_INFO *info);
 399 static void hdlcdev_rx(MGSLPC_INFO *info, char *buf, int size);
 400 static int  hdlcdev_init(MGSLPC_INFO *info);
 401 static void hdlcdev_exit(MGSLPC_INFO *info);
 402 #endif
 403
 404 static void trace_block(MGSLPC_INFO *info,const char* data, int count, int xmit);
 405
 406 static BOOLEAN register_test(MGSLPC_INFO *info);
 407 static BOOLEAN irq_test(MGSLPC_INFO *info);
 408 static int adapter_test(MGSLPC_INFO *info);
 409
 410 static int claim_resources(MGSLPC_INFO *info);
 411 static void release_resources(MGSLPC_INFO *info);
 412 static void mgslpc_add_device(MGSLPC_INFO *info);
 413 static void mgslpc_remove_device(MGSLPC_INFO *info);
 414
 415 static int  rx_get_frame(MGSLPC_INFO *info);
 416 static void rx_reset_buffers(MGSLPC_INFO *info);
 417 static int  rx_alloc_buffers(MGSLPC_INFO *info);
 418 static void rx_free_buffers(MGSLPC_INFO *info);
 419
 420 static irqreturn_t mgslpc_isr(int irq, void *dev_id);
 421
 422 /*
 423  * Bottom half interrupt handlers
 424  */
 425 static void bh_handler(struct work_struct *work);
 426 static void bh_transmit(MGSLPC_INFO *info);
 427 static void bh_status(MGSLPC_INFO *info);
 428
 429 /*
 430  * ioctl handlers
 431  */
 432 static int tiocmget(struct tty_struct *tty, struct file *file);
 433 static int tiocmset(struct tty_struct *tty, struct file *file,
 434                     unsigned int set, unsigned int clear);
 435 static int get_stats(MGSLPC_INFO *info, struct mgsl_icount __user *user_icount);
 436 static int get_params(MGSLPC_INFO *info, MGSL_PARAMS __user *user_params);
 437 static int set_params(MGSLPC_INFO *info, MGSL_PARAMS __user *new_params);
 438 static int get_txidle(MGSLPC_INFO *info, int __user *idle_mode);
 439 static int set_txidle(MGSLPC_INFO *info, int idle_mode);
 440 static int set_txenable(MGSLPC_INFO *info, int enable);
 441 static int tx_abort(MGSLPC_INFO *info);
 442 static int set_rxenable(MGSLPC_INFO *info, int enable);
 443 static int wait_events(MGSLPC_INFO *info, int __user *mask);
 444
 445 static MGSLPC_INFO *mgslpc_device_list = NULL;
 446 static int mgslpc_device_count = 0;
 447
 448 /*
 449  * Set this param to non-zero to load eax with the
 450  * .text section address and breakpoint on module load.
 451  * This is useful for use with gdb and add-symbol-file command.
 452  */
 453 static int break_on_load=0;
 454
 455 /*
 456  * Driver major number, defaults to zero to get auto
 457  * assigned major number. May be forced as module parameter.
 458  */
 459 static int ttymajor=0;
 460
 461 static int debug_level = 0;
 462 static int maxframe[MAX_DEVICE_COUNT] = {0,};
 463 static int dosyncppp[MAX_DEVICE_COUNT] = {1,1,1,1};
 464
 465 module_param(break_on_load, bool, 0);
 466 module_param(ttymajor, int, 0);
 467 module_param(debug_level, int, 0);
 468 module_param_array(maxframe, int, NULL, 0);
 469 module_param_array(dosyncppp, int, NULL, 0);
 470
 471 MODULE_LICENSE("GPL");
 472
 473 static char *driver_name = "SyncLink PC Card driver";
 474 static char *driver_version = "$Revision: 4.34 $";
 475
 476 static struct tty_driver *serial_driver;
 477
 478 /* number of characters left in xmit buffer before we ask for more */
 479 #define WAKEUP_CHARS 256
 480
 481 static void mgslpc_change_params(MGSLPC_INFO *info);
 482 static void mgslpc_wait_until_sent(struct tty_struct *tty, int timeout);
 483
 484 /* PCMCIA prototypes */
 485
 486 static int mgslpc_config(struct pcmcia_device *link);
 487 static void mgslpc_release(u_long arg);
 488 static void mgslpc_detach(struct pcmcia_device *p_dev);
 489
 490 /*
 491  * 1st function defined in .text section. Calling this function in
 492  * init_module() followed by a breakpoint allows a remote debugger
 493  * (gdb) to get the .text address for the add-symbol-file command.
 494  * This allows remote debugging of dynamically loadable modules.
 495  */
 496 static void* mgslpc_get_text_ptr(void)
 497 {
 498         return mgslpc_get_text_ptr;
 499 }
 500
 501 /**
 502  * line discipline callback wrappers
 503  *
 504  * The wrappers maintain line discipline references
 505  * while calling into the line discipline.
 506  *
 507  * ldisc_flush_buffer - flush line discipline receive buffers
 508  * ldisc_receive_buf  - pass receive data to line discipline
 509  */
 510
 511 static void ldisc_flush_buffer(struct tty_struct *tty)
 512 {
 513         struct tty_ldisc *ld = tty_ldisc_ref(tty);
 514         if (ld) {
 515                 if (ld->flush_buffer)
 516                         ld->flush_buffer(tty);
 517                 tty_ldisc_deref(ld);
 518         }
 519 }
 520
 521 static void ldisc_receive_buf(struct tty_struct *tty,
 522                               const __u8 *data, char *flags, int count)
 523 {
 524         struct tty_ldisc *ld;
 525         if (!tty)
 526                 return;
 527         ld = tty_ldisc_ref(tty);
 528         if (ld) {
 529                 if (ld->receive_buf)
 530                         ld->receive_buf(tty, data, flags, count);
 531                 tty_ldisc_deref(ld);
 532         }
 533 }
 534
 535 static int mgslpc_probe(struct pcmcia_device *link)
 536 {
 537     MGSLPC_INFO *info;
 538     int ret;
 539
 540     if (debug_level >= DEBUG_LEVEL_INFO)
 541             printk("mgslpc_attach\n");
 542
 543     info = kzalloc(sizeof(MGSLPC_INFO), GFP_KERNEL);
 544     if (!info) {
 545             printk("Error can't allocate device instance data\n");
 546             return -ENOMEM;
 547     }
 548
 549     info->magic = MGSLPC_MAGIC;
 550     INIT_WORK(&info->task, bh_handler);
 551     info->max_frame_size = 4096;
 552     info->close_delay = 5*HZ/10;
 553     info->closing_wait = 30*HZ;
 554     init_waitqueue_head(&info->open_wait);
 555     init_waitqueue_head(&info->close_wait);
 556     init_waitqueue_head(&info->status_event_wait_q);
 557     init_waitqueue_head(&info->event_wait_q);
 558     spin_lock_init(&info->lock);
 559     spin_lock_init(&info->netlock);
 560     memcpy(&info->params,&default_params,sizeof(MGSL_PARAMS));
 561     info->idle_mode = HDLC_TXIDLE_FLAGS;
 562     info->imra_value = 0xffff;
 563     info->imrb_value = 0xffff;
 564     info->pim_value = 0xff;
 565
 566     info->p_dev = link;
 567     link->priv = info;
 568
 569     /* Initialize the struct pcmcia_device structure */
 570
 571     /* Interrupt setup */
 572     link->irq.Attributes = IRQ_TYPE_EXCLUSIVE;
 573     link->irq.IRQInfo1   = IRQ_LEVEL_ID;
 574     link->irq.Handler = NULL;
 575
 576     link->conf.Attributes = 0;
 577     link->conf.IntType = INT_MEMORY_AND_IO;
 578
 579     ret = mgslpc_config(link);
 580     if (ret)
 581             return ret;
 582
 583     mgslpc_add_device(info);
 584
 585     return 0;
 586 }
 587
 588 /* Card has been inserted.
 589  */
 590
 591 #define CS_CHECK(fn, ret) \
 592 do { last_fn = (fn); if ((last_ret = (ret)) != 0) goto cs_failed; } while (0)
 593
 594 static int mgslpc_config(struct pcmcia_device *link)
 595 {
 596     MGSLPC_INFO *info = link->priv;
 597     tuple_t tuple;
 598     cisparse_t parse;
 599     int last_fn, last_ret;
 600     u_char buf[64];
 601     cistpl_cftable_entry_t dflt = { 0 };
 602     cistpl_cftable_entry_t *cfg;
 603
 604     if (debug_level >= DEBUG_LEVEL_INFO)
 605             printk("mgslpc_config(0x%p)\n", link);
 606
 607     tuple.Attributes = 0;
 608     tuple.TupleData = buf;
 609     tuple.TupleDataMax = sizeof(buf);
 610     tuple.TupleOffset = 0;
 611
 612     /* get CIS configuration entry */
 613
 614     tuple.DesiredTuple = CISTPL_CFTABLE_ENTRY;
 615     CS_CHECK(GetFirstTuple, pcmcia_get_first_tuple(link, &tuple));
 616
 617     cfg = &(parse.cftable_entry);
 618     CS_CHECK(GetTupleData, pcmcia_get_tuple_data(link, &tuple));
 619     CS_CHECK(ParseTuple, pcmcia_parse_tuple(link, &tuple, &parse));
 620
 621     if (cfg->flags & CISTPL_CFTABLE_DEFAULT) dflt = *cfg;
 622     if (cfg->index == 0)
 623             goto cs_failed;
 624
 625     link->conf.ConfigIndex = cfg->index;
 626     link->conf.Attributes |= CONF_ENABLE_IRQ;
 627
 628     /* IO window settings */
 629     link->io.NumPorts1 = 0;
 630     if ((cfg->io.nwin > 0) || (dflt.io.nwin > 0)) {
 631             cistpl_io_t *io = (cfg->io.nwin) ? &cfg->io : &dflt.io;
 632             link->io.Attributes1 = IO_DATA_PATH_WIDTH_AUTO;
 633             if (!(io->flags & CISTPL_IO_8BIT))
 634                     link->io.Attributes1 = IO_DATA_PATH_WIDTH_16;
 635             if (!(io->flags & CISTPL_IO_16BIT))
 636                     link->io.Attributes1 = IO_DATA_PATH_WIDTH_8;
 637             link->io.IOAddrLines = io->flags & CISTPL_IO_LINES_MASK;
 638             link->io.BasePort1 = io->win[0].base;
 639             link->io.NumPorts1 = io->win[0].len;
 640             CS_CHECK(RequestIO, pcmcia_request_io(link, &link->io));
 641     }
 642
 643     link->conf.Attributes = CONF_ENABLE_IRQ;
 644     link->conf.IntType = INT_MEMORY_AND_IO;
 645     link->conf.ConfigIndex = 8;
 646     link->conf.Present = PRESENT_OPTION;
 647
 648     link->irq.Attributes |= IRQ_HANDLE_PRESENT;
 649     link->irq.Handler     = mgslpc_isr;
 650     link->irq.Instance    = info;
 651     CS_CHECK(RequestIRQ, pcmcia_request_irq(link, &link->irq));
 652
 653     CS_CHECK(RequestConfiguration, pcmcia_request_configuration(link, &link->conf));
 654
 655     info->io_base = link->io.BasePort1;
 656     info->irq_level = link->irq.AssignedIRQ;
 657
 658     /* add to linked list of devices */
 659     sprintf(info->node.dev_name, "mgslpc0");
 660     info->node.major = info->node.minor = 0;
 661     link->dev_node = &info->node;
 662
 663     printk(KERN_INFO "%s: index 0x%02x:",
 664            info->node.dev_name, link->conf.ConfigIndex);
 665     if (link->conf.Attributes & CONF_ENABLE_IRQ)
 666             printk(", irq %d", link->irq.AssignedIRQ);
 667     if (link->io.NumPorts1)
 668             printk(", io 0x%04x-0x%04x", link->io.BasePort1,
 669                    link->io.BasePort1+link->io.NumPorts1-1);
 670     printk("\n");
 671     return 0;
 672
 673 cs_failed:
 674     cs_error(link, last_fn, last_ret);
 675     mgslpc_release((u_long)link);
 676     return -ENODEV;
 677 }
 678
 679 /* Card has been removed.
 680  * Unregister device and release PCMCIA configuration.
 681  * If device is open, postpone until it is closed.
 682  */
 683 static void mgslpc_release(u_long arg)
 684 {
 685         struct pcmcia_device *link = (struct pcmcia_device *)arg;
 686
 687         if (debug_level >= DEBUG_LEVEL_INFO)
 688                 printk("mgslpc_release(0x%p)\n", link);
 689
 690         pcmcia_disable_device(link);
 691 }
 692
 693 static void mgslpc_detach(struct pcmcia_device *link)
 694 {
 695         if (debug_level >= DEBUG_LEVEL_INFO)
 696                 printk("mgslpc_detach(0x%p)\n", link);
 697
 698         ((MGSLPC_INFO *)link->priv)->stop = 1;
 699         mgslpc_release((u_long)link);
 700
 701         mgslpc_remove_device((MGSLPC_INFO *)link->priv);
 702 }
 703
 704 static int mgslpc_suspend(struct pcmcia_device *link)
 705 {
 706         MGSLPC_INFO *info = link->priv;
 707
 708         info->stop = 1;
 709
 710         return 0;
 711 }
 712
 713 static int mgslpc_resume(struct pcmcia_device *link)
 714 {
 715         MGSLPC_INFO *info = link->priv;
 716
 717         info->stop = 0;
 718
 719         return 0;
 720 }
 721
 722
 723 static inline int mgslpc_paranoia_check(MGSLPC_INFO *info,
 724                                         char *name, const char *routine)
 725 {
 726 #ifdef MGSLPC_PARANOIA_CHECK
 727         static const char *badmagic =
 728                 "Warning: bad magic number for mgsl struct (%s) in %s\n";
 729         static const char *badinfo =
 730                 "Warning: null mgslpc_info for (%s) in %s\n";
 731
 732         if (!info) {
 733                 printk(badinfo, name, routine);
 734                 return 1;
 735         }
 736         if (info->magic != MGSLPC_MAGIC) {
 737                 printk(badmagic, name, routine);
 738                 return 1;
 739         }
 740 #else
 741         if (!info)
 742                 return 1;
 743 #endif
 744         return 0;
 745 }
 746
 747
 748 #define CMD_RXFIFO      BIT7    // release current rx FIFO
 749 #define CMD_RXRESET     BIT6    // receiver reset
 750 #define CMD_RXFIFO_READ BIT5
 751 #define CMD_START_TIMER BIT4
 752 #define CMD_TXFIFO      BIT3    // release current tx FIFO
 753 #define CMD_TXEOM       BIT1    // transmit end message
 754 #define CMD_TXRESET     BIT0    // transmit reset
 755
 756 static BOOLEAN wait_command_complete(MGSLPC_INFO *info, unsigned char channel)
 757 {
 758         int i = 0;
 759         /* wait for command completion */
 760         while (read_reg(info, (unsigned char)(channel+STAR)) & BIT2) {
 761                 udelay(1);
 762                 if (i++ == 1000)
 763                         return FALSE;
 764         }
 765         return TRUE;
 766 }
 767
 768 static void issue_command(MGSLPC_INFO *info, unsigned char channel, unsigned char cmd)
 769 {
 770         wait_command_complete(info, channel);
 771         write_reg(info, (unsigned char) (channel + CMDR), cmd);
 772 }
 773
 774 static void tx_pause(struct tty_struct *tty)
 775 {
 776         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
 777         unsigned long flags;
 778
 779         if (mgslpc_paranoia_check(info, tty->name, "tx_pause"))
 780                 return;
 781         if (debug_level >= DEBUG_LEVEL_INFO)
 782                 printk("tx_pause(%s)\n",info->device_name);
 783
 784         spin_lock_irqsave(&info->lock,flags);
 785         if (info->tx_enabled)
 786                 tx_stop(info);
 787         spin_unlock_irqrestore(&info->lock,flags);
 788 }
 789
 790 static void tx_release(struct tty_struct *tty)
 791 {
 792         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
 793         unsigned long flags;
 794
 795         if (mgslpc_paranoia_check(info, tty->name, "tx_release"))
 796                 return;
 797         if (debug_level >= DEBUG_LEVEL_INFO)
 798                 printk("tx_release(%s)\n",info->device_name);
 799
 800         spin_lock_irqsave(&info->lock,flags);
 801         if (!info->tx_enabled)
 802                 tx_start(info);
 803         spin_unlock_irqrestore(&info->lock,flags);
 804 }
 805
 806 /* Return next bottom half action to perform.
 807  * or 0 if nothing to do.
 808  */
 809 static int bh_action(MGSLPC_INFO *info)
 810 {
 811         unsigned long flags;
 812         int rc = 0;
 813
 814         spin_lock_irqsave(&info->lock,flags);
 815
 816         if (info->pending_bh & BH_RECEIVE) {
 817                 info->pending_bh &= ~BH_RECEIVE;
 818                 rc = BH_RECEIVE;
 819         } else if (info->pending_bh & BH_TRANSMIT) {
 820                 info->pending_bh &= ~BH_TRANSMIT;
 821                 rc = BH_TRANSMIT;
 822         } else if (info->pending_bh & BH_STATUS) {
 823                 info->pending_bh &= ~BH_STATUS;
 824                 rc = BH_STATUS;
 825         }
 826
 827         if (!rc) {
 828                 /* Mark BH routine as complete */
 829                 info->bh_running   = 0;
 830                 info->bh_requested = 0;
 831         }
 832
 833         spin_unlock_irqrestore(&info->lock,flags);
 834
 835         return rc;
 836 }
 837
 838 static void bh_handler(struct work_struct *work)
 839 {
 840         MGSLPC_INFO *info = container_of(work, MGSLPC_INFO, task);
 841         int action;
 842
 843         if (!info)
 844                 return;
 845
 846         if (debug_level >= DEBUG_LEVEL_BH)
 847                 printk( "%s(%d):bh_handler(%s) entry\n",
 848                         __FILE__,__LINE__,info->device_name);
 849
 850         info->bh_running = 1;
 851
 852         while((action = bh_action(info)) != 0) {
 853
 854                 /* Process work item */
 855                 if ( debug_level >= DEBUG_LEVEL_BH )
 856                         printk( "%s(%d):bh_handler() work item action=%d\n",
 857                                 __FILE__,__LINE__,action);
 858
 859                 switch (action) {
 860
 861                 case BH_RECEIVE:
 862                         while(rx_get_frame(info));
 863                         break;
 864                 case BH_TRANSMIT:
 865                         bh_transmit(info);
 866                         break;
 867                 case BH_STATUS:
 868                         bh_status(info);
 869                         break;
 870                 default:
 871                         /* unknown work item ID */
 872                         printk("Unknown work item ID=%08X!\n", action);
 873                         break;
 874                 }
 875         }
 876
 877         if (debug_level >= DEBUG_LEVEL_BH)
 878                 printk( "%s(%d):bh_handler(%s) exit\n",
 879                         __FILE__,__LINE__,info->device_name);
 880 }
 881
 882 static void bh_transmit(MGSLPC_INFO *info)
 883 {
 884         struct tty_struct *tty = info->tty;
 885         if (debug_level >= DEBUG_LEVEL_BH)
 886                 printk("bh_transmit() entry on %s\n", info->device_name);
 887
 888         if (tty)
 889                 tty_wakeup(tty);
 890 }
 891
 892 static void bh_status(MGSLPC_INFO *info)
 893 {
 894         info->ri_chkcount = 0;
 895         info->dsr_chkcount = 0;
 896         info->dcd_chkcount = 0;
 897         info->cts_chkcount = 0;
 898 }
 899
 900 /* eom: non-zero = end of frame */
 901 static void rx_ready_hdlc(MGSLPC_INFO *info, int eom)
 902 {
 903         unsigned char data[2];
 904         unsigned char fifo_count, read_count, i;
 905         RXBUF *buf = (RXBUF*)(info->rx_buf + (info->rx_put * info->rx_buf_size));
 906
 907         if (debug_level >= DEBUG_LEVEL_ISR)
 908                 printk("%s(%d):rx_ready_hdlc(eom=%d)\n",__FILE__,__LINE__,eom);
 909
 910         if (!info->rx_enabled)
 911                 return;
 912
 913         if (info->rx_frame_count >= info->rx_buf_count) {
 914                 /* no more free buffers */
 915                 issue_command(info, CHA, CMD_RXRESET);
 916                 info->pending_bh |= BH_RECEIVE;
 917                 info->rx_overflow = 1;
 918                 info->icount.buf_overrun++;
 919                 return;
 920         }
 921
 922         if (eom) {
 923                 /* end of frame, get FIFO count from RBCL register */
 924                 if (!(fifo_count = (unsigned char)(read_reg(info, CHA+RBCL) & 0x1f)))
 925                         fifo_count = 32;
 926         } else
 927                 fifo_count = 32;
 928
 929         do {
 930                 if (fifo_count == 1) {
 931                         read_count = 1;
 932                         data[0] = read_reg(info, CHA + RXFIFO);
 933                 } else {
 934                         read_count = 2;
 935                         *((unsigned short *) data) = read_reg16(info, CHA + RXFIFO);
 936                 }
 937                 fifo_count -= read_count;
 938                 if (!fifo_count && eom)
 939                         buf->status = data[--read_count];
 940
 941                 for (i = 0; i < read_count; i++) {
 942                         if (buf->count >= info->max_frame_size) {
 943                                 /* frame too large, reset receiver and reset current buffer */
 944                                 issue_command(info, CHA, CMD_RXRESET);
 945                                 buf->count = 0;
 946                                 return;
 947                         }
 948                         *(buf->data + buf->count) = data[i];
 949                         buf->count++;
 950                 }
 951         } while (fifo_count);
 952
 953         if (eom) {
 954                 info->pending_bh |= BH_RECEIVE;
 955                 info->rx_frame_count++;
 956                 info->rx_put++;
 957                 if (info->rx_put >= info->rx_buf_count)
 958                         info->rx_put = 0;
 959         }
 960         issue_command(info, CHA, CMD_RXFIFO);
 961 }
 962
 963 static void rx_ready_async(MGSLPC_INFO *info, int tcd)
 964 {
 965         unsigned char data, status, flag;
 966         int fifo_count;
 967         int work = 0;
 968         struct tty_struct *tty = info->tty;
 969         struct mgsl_icount *icount = &info->icount;
 970
 971         if (tcd) {
 972                 /* early termination, get FIFO count from RBCL register */
 973                 fifo_count = (unsigned char)(read_reg(info, CHA+RBCL) & 0x1f);
 974
 975                 /* Zero fifo count could mean 0 or 32 bytes available.
 976                  * If BIT5 of STAR is set then at least 1 byte is available.
 977                  */
 978                 if (!fifo_count && (read_reg(info,CHA+STAR) & BIT5))
 979                         fifo_count = 32;
 980         } else
 981                 fifo_count = 32;
 982
 983         tty_buffer_request_room(tty, fifo_count);
 984         /* Flush received async data to receive data buffer. */
 985         while (fifo_count) {
 986                 data   = read_reg(info, CHA + RXFIFO);
 987                 status = read_reg(info, CHA + RXFIFO);
 988                 fifo_count -= 2;
 989
 990                 icount->rx++;
 991                 flag = TTY_NORMAL;
 992
 993                 // if no frameing/crc error then save data
 994                 // BIT7:parity error
 995                 // BIT6:framing error
 996
 997                 if (status & (BIT7 + BIT6)) {
 998                         if (status & BIT7)
 999                                 icount->parity++;
1000                         else
1001                                 icount->frame++;
1002
1003                         /* discard char if tty control flags say so */
1004                         if (status & info->ignore_status_mask)
1005                                 continue;
1006
1007                         status &= info->read_status_mask;
1008
1009                         if (status & BIT7)
1010                                 flag = TTY_PARITY;
1011                         else if (status & BIT6)
1012                                 flag = TTY_FRAME;
1013                 }
1014                 work += tty_insert_flip_char(tty, data, flag);
1015         }
1016         issue_command(info, CHA, CMD_RXFIFO);
1017
1018         if (debug_level >= DEBUG_LEVEL_ISR) {
1019                 printk("%s(%d):rx_ready_async",
1020                         __FILE__,__LINE__);
1021                 printk("%s(%d):rx=%d brk=%d parity=%d frame=%d overrun=%d\n",
1022                         __FILE__,__LINE__,icount->rx,icount->brk,
1023                         icount->parity,icount->frame,icount->overrun);
1024         }
1025
1026         if (work)
1027                 tty_flip_buffer_push(tty);
1028 }
1029
1030
1031 static void tx_done(MGSLPC_INFO *info)
1032 {
1033         if (!info->tx_active)
1034                 return;
1035
1036         info->tx_active = 0;
1037         info->tx_aborting = 0;
1038
1039         if (info->params.mode == MGSL_MODE_ASYNC)
1040                 return;
1041
1042         info->tx_count = info->tx_put = info->tx_get = 0;
1043         del_timer(&info->tx_timer);
1044
1045         if (info->drop_rts_on_tx_done) {
1046                 get_signals(info);
1047                 if (info->serial_signals & SerialSignal_RTS) {
1048                         info->serial_signals &= ~SerialSignal_RTS;
1049                         set_signals(info);
1050                 }
1051                 info->drop_rts_on_tx_done = 0;
1052         }
1053
1054 #if SYNCLINK_GENERIC_HDLC
1055         if (info->netcount)
1056                 hdlcdev_tx_done(info);
1057         else
1058 #endif
1059         {
1060                 if (info->tty->stopped || info->tty->hw_stopped) {
1061                         tx_stop(info);
1062                         return;
1063                 }
1064                 info->pending_bh |= BH_TRANSMIT;
1065         }
1066 }
1067
1068 static void tx_ready(MGSLPC_INFO *info)
1069 {
1070         unsigned char fifo_count = 32;
1071         int c;
1072
1073         if (debug_level >= DEBUG_LEVEL_ISR)
1074                 printk("%s(%d):tx_ready(%s)\n", __FILE__,__LINE__,info->device_name);
1075
1076         if (info->params.mode == MGSL_MODE_HDLC) {
1077                 if (!info->tx_active)
1078                         return;
1079         } else {
1080                 if (info->tty->stopped || info->tty->hw_stopped) {
1081                         tx_stop(info);
1082                         return;
1083                 }
1084                 if (!info->tx_count)
1085                         info->tx_active = 0;
1086         }
1087
1088         if (!info->tx_count)
1089                 return;
1090
1091         while (info->tx_count && fifo_count) {
1092                 c = min(2, min_t(int, fifo_count, min(info->tx_count, TXBUFSIZE - info->tx_get)));
1093
1094                 if (c == 1) {
1095                         write_reg(info, CHA + TXFIFO, *(info->tx_buf + info->tx_get));
1096                 } else {
1097                         write_reg16(info, CHA + TXFIFO,
1098                                           *((unsigned short*)(info->tx_buf + info->tx_get)));
1099                 }
1100                 info->tx_count -= c;
1101                 info->tx_get = (info->tx_get + c) & (TXBUFSIZE - 1);
1102                 fifo_count -= c;
1103         }
1104
1105         if (info->params.mode == MGSL_MODE_ASYNC) {
1106                 if (info->tx_count < WAKEUP_CHARS)
1107                         info->pending_bh |= BH_TRANSMIT;
1108                 issue_command(info, CHA, CMD_TXFIFO);
1109         } else {
1110                 if (info->tx_count)
1111                         issue_command(info, CHA, CMD_TXFIFO);
1112                 else
1113                         issue_command(info, CHA, CMD_TXFIFO + CMD_TXEOM);
1114         }
1115 }
1116
1117 static void cts_change(MGSLPC_INFO *info)
1118 {
1119         get_signals(info);
1120         if ((info->cts_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT)
1121                 irq_disable(info, CHB, IRQ_CTS);
1122         info->icount.cts++;
1123         if (info->serial_signals & SerialSignal_CTS)
1124                 info->input_signal_events.cts_up++;
1125         else
1126                 info->input_signal_events.cts_down++;
1127         wake_up_interruptible(&info->status_event_wait_q);
1128         wake_up_interruptible(&info->event_wait_q);
1129
1130         if (info->flags & ASYNC_CTS_FLOW) {
1131                 if (info->tty->hw_stopped) {
1132                         if (info->serial_signals & SerialSignal_CTS) {
1133                                 if (debug_level >= DEBUG_LEVEL_ISR)
1134                                         printk("CTS tx start...");
1135                                 if (info->tty)
1136                                         info->tty->hw_stopped = 0;
1137                                 tx_start(info);
1138                                 info->pending_bh |= BH_TRANSMIT;
1139                                 return;
1140                         }
1141                 } else {
1142                         if (!(info->serial_signals & SerialSignal_CTS)) {
1143                                 if (debug_level >= DEBUG_LEVEL_ISR)
1144                                         printk("CTS tx stop...");
1145                                 if (info->tty)
1146                                         info->tty->hw_stopped = 1;
1147                                 tx_stop(info);
1148                         }
1149                 }
1150         }
1151         info->pending_bh |= BH_STATUS;
1152 }
1153
1154 static void dcd_change(MGSLPC_INFO *info)
1155 {
1156         get_signals(info);
1157         if ((info->dcd_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT)
1158                 irq_disable(info, CHB, IRQ_DCD);
1159         info->icount.dcd++;
1160         if (info->serial_signals & SerialSignal_DCD) {
1161                 info->input_signal_events.dcd_up++;
1162         }
1163         else
1164                 info->input_signal_events.dcd_down++;
1165 #if SYNCLINK_GENERIC_HDLC
1166         if (info->netcount) {
1167                 if (info->serial_signals & SerialSignal_DCD)
1168                         netif_carrier_on(info->netdev);
1169                 else
1170                         netif_carrier_off(info->netdev);
1171         }
1172 #endif
1173         wake_up_interruptible(&info->status_event_wait_q);
1174         wake_up_interruptible(&info->event_wait_q);
1175
1176         if (info->flags & ASYNC_CHECK_CD) {
1177                 if (debug_level >= DEBUG_LEVEL_ISR)
1178                         printk("%s CD now %s...", info->device_name,
1179                                (info->serial_signals & SerialSignal_DCD) ? "on" : "off");
1180                 if (info->serial_signals & SerialSignal_DCD)
1181                         wake_up_interruptible(&info->open_wait);
1182                 else {
1183                         if (debug_level >= DEBUG_LEVEL_ISR)
1184                                 printk("doing serial hangup...");
1185                         if (info->tty)
1186                                 tty_hangup(info->tty);
1187                 }
1188         }
1189         info->pending_bh |= BH_STATUS;
1190 }
1191
1192 static void dsr_change(MGSLPC_INFO *info)
1193 {
1194         get_signals(info);
1195         if ((info->dsr_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT)
1196                 port_irq_disable(info, PVR_DSR);
1197         info->icount.dsr++;
1198         if (info->serial_signals & SerialSignal_DSR)
1199                 info->input_signal_events.dsr_up++;
1200         else
1201                 info->input_signal_events.dsr_down++;
1202         wake_up_interruptible(&info->status_event_wait_q);
1203         wake_up_interruptible(&info->event_wait_q);
1204         info->pending_bh |= BH_STATUS;
1205 }
1206
1207 static void ri_change(MGSLPC_INFO *info)
1208 {
1209         get_signals(info);
1210         if ((info->ri_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT)
1211                 port_irq_disable(info, PVR_RI);
1212         info->icount.rng++;
1213         if (info->serial_signals & SerialSignal_RI)
1214                 info->input_signal_events.ri_up++;
1215         else
1216                 info->input_signal_events.ri_down++;
1217         wake_up_interruptible(&info->status_event_wait_q);
1218         wake_up_interruptible(&info->event_wait_q);
1219         info->pending_bh |= BH_STATUS;
1220 }
1221
1222 /* Interrupt service routine entry point.
1223  *
1224  * Arguments:
1225  *
1226  * irq     interrupt number that caused interrupt
1227  * dev_id  device ID supplied during interrupt registration
1228  */
1229 static irqreturn_t mgslpc_isr(int irq, void *dev_id)
1230 {
1231         MGSLPC_INFO * info = (MGSLPC_INFO *)dev_id;
1232         unsigned short isr;
1233         unsigned char gis, pis;
1234         int count=0;
1235
1236         if (debug_level >= DEBUG_LEVEL_ISR)
1237                 printk("mgslpc_isr(%d) entry.\n", irq);
1238         if (!info)
1239                 return IRQ_NONE;
1240
1241         if (!(info->p_dev->_locked))
1242                 return IRQ_HANDLED;
1243
1244         spin_lock(&info->lock);
1245
1246         while ((gis = read_reg(info, CHA + GIS))) {
1247                 if (debug_level >= DEBUG_LEVEL_ISR)
1248                         printk("mgslpc_isr %s gis=%04X\n", info->device_name,gis);
1249
1250                 if ((gis & 0x70) || count > 1000) {
1251                         printk("synclink_cs:hardware failed or ejected\n");
1252                         break;
1253                 }
1254                 count++;
1255
1256                 if (gis & (BIT1 + BIT0)) {
1257                         isr = read_reg16(info, CHB + ISR);
1258                         if (isr & IRQ_DCD)
1259                                 dcd_change(info);
1260                         if (isr & IRQ_CTS)
1261                                 cts_change(info);
1262                 }
1263                 if (gis & (BIT3 + BIT2))
1264                 {
1265                         isr = read_reg16(info, CHA + ISR);
1266                         if (isr & IRQ_TIMER) {
1267                                 info->irq_occurred = 1;
1268                                 irq_disable(info, CHA, IRQ_TIMER);
1269                         }
1270
1271                         /* receive IRQs */
1272                         if (isr & IRQ_EXITHUNT) {
1273                                 info->icount.exithunt++;
1274                                 wake_up_interruptible(&info->event_wait_q);
1275                         }
1276                         if (isr & IRQ_BREAK_ON) {
1277                                 info->icount.brk++;
1278                                 if (info->flags & ASYNC_SAK)
1279                                         do_SAK(info->tty);
1280                         }
1281                         if (isr & IRQ_RXTIME) {
1282                                 issue_command(info, CHA, CMD_RXFIFO_READ);
1283                         }
1284                         if (isr & (IRQ_RXEOM + IRQ_RXFIFO)) {
1285                                 if (info->params.mode == MGSL_MODE_HDLC)
1286                                         rx_ready_hdlc(info, isr & IRQ_RXEOM);
1287                                 else
1288                                         rx_ready_async(info, isr & IRQ_RXEOM);
1289                         }
1290
1291                         /* transmit IRQs */
1292                         if (isr & IRQ_UNDERRUN) {
1293                                 if (info->tx_aborting)
1294                                         info->icount.txabort++;
1295                                 else
1296                                         info->icount.txunder++;
1297                                 tx_done(info);
1298                         }
1299                         else if (isr & IRQ_ALLSENT) {
1300                                 info->icount.txok++;
1301                                 tx_done(info);
1302                         }
1303                         else if (isr & IRQ_TXFIFO)
1304                                 tx_ready(info);
1305                 }
1306                 if (gis & BIT7) {
1307                         pis = read_reg(info, CHA + PIS);
1308                         if (pis & BIT1)
1309                                 dsr_change(info);
1310                         if (pis & BIT2)
1311                                 ri_change(info);
1312                 }
1313         }
1314
1315         /* Request bottom half processing if there's something
1316          * for it to do and the bh is not already running
1317          */
1318
1319         if (info->pending_bh && !info->bh_running && !info->bh_requested) {
1320                 if ( debug_level >= DEBUG_LEVEL_ISR )
1321                         printk("%s(%d):%s queueing bh task.\n",
1322                                 __FILE__,__LINE__,info->device_name);
1323                 schedule_work(&info->task);
1324                 info->bh_requested = 1;
1325         }
1326
1327         spin_unlock(&info->lock);
1328
1329         if (debug_level >= DEBUG_LEVEL_ISR)
1330                 printk("%s(%d):mgslpc_isr(%d)exit.\n",
1331                        __FILE__,__LINE__,irq);
1332
1333         return IRQ_HANDLED;
1334 }
1335
1336 /* Initialize and start device.
1337  */
1338 static int startup(MGSLPC_INFO * info)
1339 {
1340         int retval = 0;
1341
1342         if (debug_level >= DEBUG_LEVEL_INFO)
1343                 printk("%s(%d):startup(%s)\n",__FILE__,__LINE__,info->device_name);
1344
1345         if (info->flags & ASYNC_INITIALIZED)
1346                 return 0;
1347
1348         if (!info->tx_buf) {
1349                 /* allocate a page of memory for a transmit buffer */
1350                 info->tx_buf = (unsigned char *)get_zeroed_page(GFP_KERNEL);
1351                 if (!info->tx_buf) {
1352                         printk(KERN_ERR"%s(%d):%s can't allocate transmit buffer\n",
1353                                 __FILE__,__LINE__,info->device_name);
1354                         return -ENOMEM;
1355                 }
1356         }
1357
1358         info->pending_bh = 0;
1359
1360         memset(&info->icount, 0, sizeof(info->icount));
1361
1362         setup_timer(&info->tx_timer, tx_timeout, (unsigned long)info);
1363
1364         /* Allocate and claim adapter resources */
1365         retval = claim_resources(info);
1366
1367         /* perform existance check and diagnostics */
1368         if ( !retval )
1369                 retval = adapter_test(info);
1370
1371         if ( retval ) {
1372                 if (capable(CAP_SYS_ADMIN) && info->tty)
1373                         set_bit(TTY_IO_ERROR, &info->tty->flags);
1374                 release_resources(info);
1375                 return retval;
1376         }
1377
1378         /* program hardware for current parameters */
1379         mgslpc_change_params(info);
1380
1381         if (info->tty)
1382                 clear_bit(TTY_IO_ERROR, &info->tty->flags);
1383
1384         info->flags |= ASYNC_INITIALIZED;
1385
1386         return 0;
1387 }
1388
1389 /* Called by mgslpc_close() and mgslpc_hangup() to shutdown hardware
1390  */
1391 static void shutdown(MGSLPC_INFO * info)
1392 {
1393         unsigned long flags;
1394
1395         if (!(info->flags & ASYNC_INITIALIZED))
1396                 return;
1397
1398         if (debug_level >= DEBUG_LEVEL_INFO)
1399                 printk("%s(%d):mgslpc_shutdown(%s)\n",
1400                          __FILE__,__LINE__, info->device_name );
1401
1402         /* clear status wait queue because status changes */
1403         /* can't happen after shutting down the hardware */
1404         wake_up_interruptible(&info->status_event_wait_q);
1405         wake_up_interruptible(&info->event_wait_q);
1406
1407         del_timer_sync(&info->tx_timer);
1408
1409         if (info->tx_buf) {
1410                 free_page((unsigned long) info->tx_buf);
1411                 info->tx_buf = NULL;
1412         }
1413
1414         spin_lock_irqsave(&info->lock,flags);
1415
1416         rx_stop(info);
1417         tx_stop(info);
1418
1419         /* TODO:disable interrupts instead of reset to preserve signal states */
1420         reset_device(info);
1421
1422         if (!info->tty || info->tty->termios->c_cflag & HUPCL) {
1423                 info->serial_signals &= ~(SerialSignal_DTR + SerialSignal_RTS);
1424                 set_signals(info);
1425         }
1426
1427         spin_unlock_irqrestore(&info->lock,flags);
1428
1429         release_resources(info);
1430
1431         if (info->tty)
1432                 set_bit(TTY_IO_ERROR, &info->tty->flags);
1433
1434         info->flags &= ~ASYNC_INITIALIZED;
1435 }
1436
1437 static void mgslpc_program_hw(MGSLPC_INFO *info)
1438 {
1439         unsigned long flags;
1440
1441         spin_lock_irqsave(&info->lock,flags);
1442
1443         rx_stop(info);
1444         tx_stop(info);
1445         info->tx_count = info->tx_put = info->tx_get = 0;
1446
1447         if (info->params.mode == MGSL_MODE_HDLC || info->netcount)
1448                 hdlc_mode(info);
1449         else
1450                 async_mode(info);
1451
1452         set_signals(info);
1453
1454         info->dcd_chkcount = 0;
1455         info->cts_chkcount = 0;
1456         info->ri_chkcount = 0;
1457         info->dsr_chkcount = 0;
1458
1459         irq_enable(info, CHB, IRQ_DCD | IRQ_CTS);
1460         port_irq_enable(info, (unsigned char) PVR_DSR | PVR_RI);
1461         get_signals(info);
1462
1463         if (info->netcount || info->tty->termios->c_cflag & CREAD)
1464                 rx_start(info);
1465
1466         spin_unlock_irqrestore(&info->lock,flags);
1467 }
1468
1469 /* Reconfigure adapter based on new parameters
1470  */
1471 static void mgslpc_change_params(MGSLPC_INFO *info)
1472 {
1473         unsigned cflag;
1474         int bits_per_char;
1475
1476         if (!info->tty || !info->tty->termios)
1477                 return;
1478
1479         if (debug_level >= DEBUG_LEVEL_INFO)
1480                 printk("%s(%d):mgslpc_change_params(%s)\n",
1481                          __FILE__,__LINE__, info->device_name );
1482
1483         cflag = info->tty->termios->c_cflag;
1484
1485         /* if B0 rate (hangup) specified then negate DTR and RTS */
1486         /* otherwise assert DTR and RTS */
1487         if (cflag & CBAUD)
1488                 info->serial_signals |= SerialSignal_RTS + SerialSignal_DTR;
1489         else
1490                 info->serial_signals &= ~(SerialSignal_RTS + SerialSignal_DTR);
1491
1492         /* byte size and parity */
1493
1494         switch (cflag & CSIZE) {
1495         case CS5: info->params.data_bits = 5; break;
1496         case CS6: info->params.data_bits = 6; break;
1497         case CS7: info->params.data_bits = 7; break;
1498         case CS8: info->params.data_bits = 8; break;
1499         default:  info->params.data_bits = 7; break;
1500         }
1501
1502         if (cflag & CSTOPB)
1503                 info->params.stop_bits = 2;
1504         else
1505                 info->params.stop_bits = 1;
1506
1507         info->params.parity = ASYNC_PARITY_NONE;
1508         if (cflag & PARENB) {
1509                 if (cflag & PARODD)
1510                         info->params.parity = ASYNC_PARITY_ODD;
1511                 else
1512                         info->params.parity = ASYNC_PARITY_EVEN;
1513 #ifdef CMSPAR
1514                 if (cflag & CMSPAR)
1515                         info->params.parity = ASYNC_PARITY_SPACE;
1516 #endif
1517         }
1518
1519         /* calculate number of jiffies to transmit a full
1520          * FIFO (32 bytes) at specified data rate
1521          */
1522         bits_per_char = info->params.data_bits +
1523                         info->params.stop_bits + 1;
1524
1525         /* if port data rate is set to 460800 or less then
1526          * allow tty settings to override, otherwise keep the
1527          * current data rate.
1528          */
1529         if (info->params.data_rate <= 460800) {
1530                 info->params.data_rate = tty_get_baud_rate(info->tty);
1531         }
1532
1533         if ( info->params.data_rate ) {
1534                 info->timeout = (32*HZ*bits_per_char) /
1535                                 info->params.data_rate;
1536         }
1537         info->timeout += HZ/50;         /* Add .02 seconds of slop */
1538
1539         if (cflag & CRTSCTS)
1540                 info->flags |= ASYNC_CTS_FLOW;
1541         else
1542                 info->flags &= ~ASYNC_CTS_FLOW;
1543
1544         if (cflag & CLOCAL)
1545                 info->flags &= ~ASYNC_CHECK_CD;
1546         else
1547                 info->flags |= ASYNC_CHECK_CD;
1548
1549         /* process tty input control flags */
1550
1551         info->read_status_mask = 0;
1552         if (I_INPCK(info->tty))
1553                 info->read_status_mask |= BIT7 | BIT6;
1554         if (I_IGNPAR(info->tty))
1555                 info->ignore_status_mask |= BIT7 | BIT6;
1556
1557         mgslpc_program_hw(info);
1558 }
1559
1560 /* Add a character to the transmit buffer
1561  */
1562 static void mgslpc_put_char(struct tty_struct *tty, unsigned char ch)
1563 {
1564         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1565         unsigned long flags;
1566
1567         if (debug_level >= DEBUG_LEVEL_INFO) {
1568                 printk( "%s(%d):mgslpc_put_char(%d) on %s\n",
1569                         __FILE__,__LINE__,ch,info->device_name);
1570         }
1571
1572         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_put_char"))
1573                 return;
1574
1575         if (!info->tx_buf)
1576                 return;
1577
1578         spin_lock_irqsave(&info->lock,flags);
1579
1580         if (info->params.mode == MGSL_MODE_ASYNC || !info->tx_active) {
1581                 if (info->tx_count < TXBUFSIZE - 1) {
1582                         info->tx_buf[info->tx_put++] = ch;
1583                         info->tx_put &= TXBUFSIZE-1;
1584                         info->tx_count++;
1585                 }
1586         }
1587
1588         spin_unlock_irqrestore(&info->lock,flags);
1589 }
1590
1591 /* Enable transmitter so remaining characters in the
1592  * transmit buffer are sent.
1593  */
1594 static void mgslpc_flush_chars(struct tty_struct *tty)
1595 {
1596         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1597         unsigned long flags;
1598
1599         if (debug_level >= DEBUG_LEVEL_INFO)
1600                 printk( "%s(%d):mgslpc_flush_chars() entry on %s tx_count=%d\n",
1601                         __FILE__,__LINE__,info->device_name,info->tx_count);
1602
1603         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_flush_chars"))
1604                 return;
1605
1606         if (info->tx_count <= 0 || tty->stopped ||
1607             tty->hw_stopped || !info->tx_buf)
1608                 return;
1609
1610         if (debug_level >= DEBUG_LEVEL_INFO)
1611                 printk( "%s(%d):mgslpc_flush_chars() entry on %s starting transmitter\n",
1612                         __FILE__,__LINE__,info->device_name);
1613
1614         spin_lock_irqsave(&info->lock,flags);
1615         if (!info->tx_active)
1616                 tx_start(info);
1617         spin_unlock_irqrestore(&info->lock,flags);
1618 }
1619
1620 /* Send a block of data
1621  *
1622  * Arguments:
1623  *
1624  * tty        pointer to tty information structure
1625  * buf        pointer to buffer containing send data
1626  * count      size of send data in bytes
1627  *
1628  * Returns: number of characters written
1629  */
1630 static int mgslpc_write(struct tty_struct * tty,
1631                         const unsigned char *buf, int count)
1632 {
1633         int c, ret = 0;
1634         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1635         unsigned long flags;
1636
1637         if (debug_level >= DEBUG_LEVEL_INFO)
1638                 printk( "%s(%d):mgslpc_write(%s) count=%d\n",
1639                         __FILE__,__LINE__,info->device_name,count);
1640
1641         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_write") ||
1642                 !info->tx_buf)
1643                 goto cleanup;
1644
1645         if (info->params.mode == MGSL_MODE_HDLC) {
1646                 if (count > TXBUFSIZE) {
1647                         ret = -EIO;
1648                         goto cleanup;
1649                 }
1650                 if (info->tx_active)
1651                         goto cleanup;
1652                 else if (info->tx_count)
1653                         goto start;
1654         }
1655
1656         for (;;) {
1657                 c = min(count,
1658                         min(TXBUFSIZE - info->tx_count - 1,
1659                             TXBUFSIZE - info->tx_put));
1660                 if (c <= 0)
1661                         break;
1662
1663                 memcpy(info->tx_buf + info->tx_put, buf, c);
1664
1665                 spin_lock_irqsave(&info->lock,flags);
1666                 info->tx_put = (info->tx_put + c) & (TXBUFSIZE-1);
1667                 info->tx_count += c;
1668                 spin_unlock_irqrestore(&info->lock,flags);
1669
1670                 buf += c;
1671                 count -= c;
1672                 ret += c;
1673         }
1674 start:
1675         if (info->tx_count && !tty->stopped && !tty->hw_stopped) {
1676                 spin_lock_irqsave(&info->lock,flags);
1677                 if (!info->tx_active)
1678                         tx_start(info);
1679                 spin_unlock_irqrestore(&info->lock,flags);
1680         }
1681 cleanup:
1682         if (debug_level >= DEBUG_LEVEL_INFO)
1683                 printk( "%s(%d):mgslpc_write(%s) returning=%d\n",
1684                         __FILE__,__LINE__,info->device_name,ret);
1685         return ret;
1686 }
1687
1688 /* Return the count of free bytes in transmit buffer
1689  */
1690 static int mgslpc_write_room(struct tty_struct *tty)
1691 {
1692         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1693         int ret;
1694
1695         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_write_room"))
1696                 return 0;
1697
1698         if (info->params.mode == MGSL_MODE_HDLC) {
1699                 /* HDLC (frame oriented) mode */
1700                 if (info->tx_active)
1701                         return 0;
1702                 else
1703                         return HDLC_MAX_FRAME_SIZE;
1704         } else {
1705                 ret = TXBUFSIZE - info->tx_count - 1;
1706                 if (ret < 0)
1707                         ret = 0;
1708         }
1709
1710         if (debug_level >= DEBUG_LEVEL_INFO)
1711                 printk("%s(%d):mgslpc_write_room(%s)=%d\n",
1712                          __FILE__,__LINE__, info->device_name, ret);
1713         return ret;
1714 }
1715
1716 /* Return the count of bytes in transmit buffer
1717  */
1718 static int mgslpc_chars_in_buffer(struct tty_struct *tty)
1719 {
1720         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1721         int rc;
1722
1723         if (debug_level >= DEBUG_LEVEL_INFO)
1724                 printk("%s(%d):mgslpc_chars_in_buffer(%s)\n",
1725                          __FILE__,__LINE__, info->device_name );
1726
1727         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_chars_in_buffer"))
1728                 return 0;
1729
1730         if (info->params.mode == MGSL_MODE_HDLC)
1731                 rc = info->tx_active ? info->max_frame_size : 0;
1732         else
1733                 rc = info->tx_count;
1734
1735         if (debug_level >= DEBUG_LEVEL_INFO)
1736                 printk("%s(%d):mgslpc_chars_in_buffer(%s)=%d\n",
1737                          __FILE__,__LINE__, info->device_name, rc);
1738
1739         return rc;
1740 }
1741
1742 /* Discard all data in the send buffer
1743  */
1744 static void mgslpc_flush_buffer(struct tty_struct *tty)
1745 {
1746         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1747         unsigned long flags;
1748
1749         if (debug_level >= DEBUG_LEVEL_INFO)
1750                 printk("%s(%d):mgslpc_flush_buffer(%s) entry\n",
1751                          __FILE__,__LINE__, info->device_name );
1752
1753         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_flush_buffer"))
1754                 return;
1755
1756         spin_lock_irqsave(&info->lock,flags);
1757         info->tx_count = info->tx_put = info->tx_get = 0;
1758         del_timer(&info->tx_timer);
1759         spin_unlock_irqrestore(&info->lock,flags);
1760
1761         wake_up_interruptible(&tty->write_wait);
1762         tty_wakeup(tty);
1763 }
1764
1765 /* Send a high-priority XON/XOFF character
1766  */
1767 static void mgslpc_send_xchar(struct tty_struct *tty, char ch)
1768 {
1769         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1770         unsigned long flags;
1771
1772         if (debug_level >= DEBUG_LEVEL_INFO)
1773                 printk("%s(%d):mgslpc_send_xchar(%s,%d)\n",
1774                          __FILE__,__LINE__, info->device_name, ch );
1775
1776         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_send_xchar"))
1777                 return;
1778
1779         info->x_char = ch;
1780         if (ch) {
1781                 spin_lock_irqsave(&info->lock,flags);
1782                 if (!info->tx_enabled)
1783                         tx_start(info);
1784                 spin_unlock_irqrestore(&info->lock,flags);
1785         }
1786 }
1787
1788 /* Signal remote device to throttle send data (our receive data)
1789  */
1790 static void mgslpc_throttle(struct tty_struct * tty)
1791 {
1792         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1793         unsigned long flags;
1794
1795         if (debug_level >= DEBUG_LEVEL_INFO)
1796                 printk("%s(%d):mgslpc_throttle(%s) entry\n",
1797                          __FILE__,__LINE__, info->device_name );
1798
1799         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_throttle"))
1800                 return;
1801
1802         if (I_IXOFF(tty))
1803                 mgslpc_send_xchar(tty, STOP_CHAR(tty));
1804
1805         if (tty->termios->c_cflag & CRTSCTS) {
1806                 spin_lock_irqsave(&info->lock,flags);
1807                 info->serial_signals &= ~SerialSignal_RTS;
1808                 set_signals(info);
1809                 spin_unlock_irqrestore(&info->lock,flags);
1810         }
1811 }
1812
1813 /* Signal remote device to stop throttling send data (our receive data)
1814  */
1815 static void mgslpc_unthrottle(struct tty_struct * tty)
1816 {
1817         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1818         unsigned long flags;
1819
1820         if (debug_level >= DEBUG_LEVEL_INFO)
1821                 printk("%s(%d):mgslpc_unthrottle(%s) entry\n",
1822                          __FILE__,__LINE__, info->device_name );
1823
1824         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_unthrottle"))
1825                 return;
1826
1827         if (I_IXOFF(tty)) {
1828                 if (info->x_char)
1829                         info->x_char = 0;
1830                 else
1831                         mgslpc_send_xchar(tty, START_CHAR(tty));
1832         }
1833
1834         if (tty->termios->c_cflag & CRTSCTS) {
1835                 spin_lock_irqsave(&info->lock,flags);
1836                 info->serial_signals |= SerialSignal_RTS;
1837                 set_signals(info);
1838                 spin_unlock_irqrestore(&info->lock,flags);
1839         }
1840 }
1841
1842 /* get the current serial statistics
1843  */
1844 static int get_stats(MGSLPC_INFO * info, struct mgsl_icount __user *user_icount)
1845 {
1846         int err;
1847         if (debug_level >= DEBUG_LEVEL_INFO)
1848                 printk("get_params(%s)\n", info->device_name);
1849         if (!user_icount) {
1850                 memset(&info->icount, 0, sizeof(info->icount));
1851         } else {
1852                 COPY_TO_USER(err, user_icount, &info->icount, sizeof(struct mgsl_icount));
1853                 if (err)
1854                         return -EFAULT;
1855         }
1856         return 0;
1857 }
1858
1859 /* get the current serial parameters
1860  */
1861 static int get_params(MGSLPC_INFO * info, MGSL_PARAMS __user *user_params)
1862 {
1863         int err;
1864         if (debug_level >= DEBUG_LEVEL_INFO)
1865                 printk("get_params(%s)\n", info->device_name);
1866         COPY_TO_USER(err,user_params, &info->params, sizeof(MGSL_PARAMS));
1867         if (err)
1868                 return -EFAULT;
1869         return 0;
1870 }
1871
1872 /* set the serial parameters
1873  *
1874  * Arguments:
1875  *
1876  *      info            pointer to device instance data
1877  *      new_params      user buffer containing new serial params
1878  *
1879  * Returns:     0 if success, otherwise error code
1880  */
1881 static int set_params(MGSLPC_INFO * info, MGSL_PARAMS __user *new_params)
1882 {
1883         unsigned long flags;
1884         MGSL_PARAMS tmp_params;
1885         int err;
1886
1887         if (debug_level >= DEBUG_LEVEL_INFO)
1888                 printk("%s(%d):set_params %s\n", __FILE__,__LINE__,
1889                         info->device_name );
1890         COPY_FROM_USER(err,&tmp_params, new_params, sizeof(MGSL_PARAMS));
1891         if (err) {
1892                 if ( debug_level >= DEBUG_LEVEL_INFO )
1893                         printk( "%s(%d):set_params(%s) user buffer copy failed\n",
1894                                 __FILE__,__LINE__,info->device_name);
1895                 return -EFAULT;
1896         }
1897
1898         spin_lock_irqsave(&info->lock,flags);
1899         memcpy(&info->params,&tmp_params,sizeof(MGSL_PARAMS));
1900         spin_unlock_irqrestore(&info->lock,flags);
1901
1902         mgslpc_change_params(info);
1903
1904         return 0;
1905 }
1906
1907 static int get_txidle(MGSLPC_INFO * info, int __user *idle_mode)
1908 {
1909         int err;
1910         if (debug_level >= DEBUG_LEVEL_INFO)
1911                 printk("get_txidle(%s)=%d\n", info->device_name, info->idle_mode);
1912         COPY_TO_USER(err,idle_mode, &info->idle_mode, sizeof(int));
1913         if (err)
1914                 return -EFAULT;
1915         return 0;
1916 }
1917
1918 static int set_txidle(MGSLPC_INFO * info, int idle_mode)
1919 {
1920         unsigned long flags;
1921         if (debug_level >= DEBUG_LEVEL_INFO)
1922                 printk("set_txidle(%s,%d)\n", info->device_name, idle_mode);
1923         spin_lock_irqsave(&info->lock,flags);
1924         info->idle_mode = idle_mode;
1925         tx_set_idle(info);
1926         spin_unlock_irqrestore(&info->lock,flags);
1927         return 0;
1928 }
1929
1930 static int get_interface(MGSLPC_INFO * info, int __user *if_mode)
1931 {
1932         int err;
1933         if (debug_level >= DEBUG_LEVEL_INFO)
1934                 printk("get_interface(%s)=%d\n", info->device_name, info->if_mode);
1935         COPY_TO_USER(err,if_mode, &info->if_mode, sizeof(int));
1936         if (err)
1937                 return -EFAULT;
1938         return 0;
1939 }
1940
1941 static int set_interface(MGSLPC_INFO * info, int if_mode)
1942 {
1943         unsigned long flags;
1944         unsigned char val;
1945         if (debug_level >= DEBUG_LEVEL_INFO)
1946                 printk("set_interface(%s,%d)\n", info->device_name, if_mode);
1947         spin_lock_irqsave(&info->lock,flags);
1948         info->if_mode = if_mode;
1949
1950         val = read_reg(info, PVR) & 0x0f;
1951         switch (info->if_mode)
1952         {
1953         case MGSL_INTERFACE_RS232: val |= PVR_RS232; break;
1954         case MGSL_INTERFACE_V35:   val |= PVR_V35;   break;
1955         case MGSL_INTERFACE_RS422: val |= PVR_RS422; break;
1956         }
1957         write_reg(info, PVR, val);
1958
1959         spin_unlock_irqrestore(&info->lock,flags);
1960         return 0;
1961 }
1962
1963 static int set_txenable(MGSLPC_INFO * info, int enable)
1964 {
1965         unsigned long flags;
1966
1967         if (debug_level >= DEBUG_LEVEL_INFO)
1968                 printk("set_txenable(%s,%d)\n", info->device_name, enable);
1969
1970         spin_lock_irqsave(&info->lock,flags);
1971         if (enable) {
1972                 if (!info->tx_enabled)
1973                         tx_start(info);
1974         } else {
1975                 if (info->tx_enabled)
1976                         tx_stop(info);
1977         }
1978         spin_unlock_irqrestore(&info->lock,flags);
1979         return 0;
1980 }
1981
1982 static int tx_abort(MGSLPC_INFO * info)
1983 {
1984         unsigned long flags;
1985
1986         if (debug_level >= DEBUG_LEVEL_INFO)
1987                 printk("tx_abort(%s)\n", info->device_name);
1988
1989         spin_lock_irqsave(&info->lock,flags);
1990         if (info->tx_active && info->tx_count &&
1991             info->params.mode == MGSL_MODE_HDLC) {
1992                 /* clear data count so FIFO is not filled on next IRQ.
1993                  * This results in underrun and abort transmission.
1994                  */
1995                 info->tx_count = info->tx_put = info->tx_get = 0;
1996                 info->tx_aborting = TRUE;
1997         }
1998         spin_unlock_irqrestore(&info->lock,flags);
1999         return 0;
2000 }
2001
2002 static int set_rxenable(MGSLPC_INFO * info, int enable)
2003 {
2004         unsigned long flags;
2005
2006         if (debug_level >= DEBUG_LEVEL_INFO)
2007                 printk("set_rxenable(%s,%d)\n", info->device_name, enable);
2008
2009         spin_lock_irqsave(&info->lock,flags);
2010         if (enable) {
2011                 if (!info->rx_enabled)
2012                         rx_start(info);
2013         } else {
2014                 if (info->rx_enabled)
2015                         rx_stop(info);
2016         }
2017         spin_unlock_irqrestore(&info->lock,flags);
2018         return 0;
2019 }
2020
2021 /* wait for specified event to occur
2022  *
2023  * Arguments:           info    pointer to device instance data
2024  *                      mask    pointer to bitmask of events to wait for
2025  * Return Value:        0       if successful and bit mask updated with
2026  *                              of events triggerred,
2027  *                      otherwise error code
2028  */
2029 static int wait_events(MGSLPC_INFO * info, int __user *mask_ptr)
2030 {
2031         unsigned long flags;
2032         int s;
2033         int rc=0;
2034         struct mgsl_icount cprev, cnow;
2035         int events;
2036         int mask;
2037         struct  _input_signal_events oldsigs, newsigs;
2038         DECLARE_WAITQUEUE(wait, current);
2039
2040         COPY_FROM_USER(rc,&mask, mask_ptr, sizeof(int));
2041         if (rc)
2042                 return  -EFAULT;
2043
2044         if (debug_level >= DEBUG_LEVEL_INFO)
2045                 printk("wait_events(%s,%d)\n", info->device_name, mask);
2046
2047         spin_lock_irqsave(&info->lock,flags);
2048
2049         /* return immediately if state matches requested events */
2050         get_signals(info);
2051         s = info->serial_signals;
2052         events = mask &
2053                 ( ((s & SerialSignal_DSR) ? MgslEvent_DsrActive:MgslEvent_DsrInactive) +
2054                   ((s & SerialSignal_DCD) ? MgslEvent_DcdActive:MgslEvent_DcdInactive) +
2055                   ((s & SerialSignal_CTS) ? MgslEvent_CtsActive:MgslEvent_CtsInactive) +
2056                   ((s & SerialSignal_RI)  ? MgslEvent_RiActive :MgslEvent_RiInactive) );
2057         if (events) {
2058                 spin_unlock_irqrestore(&info->lock,flags);
2059                 goto exit;
2060         }
2061
2062         /* save current irq counts */
2063         cprev = info->icount;
2064         oldsigs = info->input_signal_events;
2065
2066         if ((info->params.mode == MGSL_MODE_HDLC) &&
2067             (mask & MgslEvent_ExitHuntMode))
2068                 irq_enable(info, CHA, IRQ_EXITHUNT);
2069
2070         set_current_state(TASK_INTERRUPTIBLE);
2071         add_wait_queue(&info->event_wait_q, &wait);
2072
2073         spin_unlock_irqrestore(&info->lock,flags);
2074
2075
2076         for(;;) {
2077                 schedule();
2078                 if (signal_pending(current)) {
2079                         rc = -ERESTARTSYS;
2080                         break;
2081                 }
2082
2083                 /* get current irq counts */
2084                 spin_lock_irqsave(&info->lock,flags);
2085                 cnow = info->icount;
2086                 newsigs = info->input_signal_events;
2087                 set_current_state(TASK_INTERRUPTIBLE);
2088                 spin_unlock_irqrestore(&info->lock,flags);
2089
2090                 /* if no change, wait aborted for some reason */
2091                 if (newsigs.dsr_up   == oldsigs.dsr_up   &&
2092                     newsigs.dsr_down == oldsigs.dsr_down &&
2093                     newsigs.dcd_up   == oldsigs.dcd_up   &&
2094                     newsigs.dcd_down == oldsigs.dcd_down &&
2095                     newsigs.cts_up   == oldsigs.cts_up   &&
2096                     newsigs.cts_down == oldsigs.cts_down &&
2097                     newsigs.ri_up    == oldsigs.ri_up    &&
2098                     newsigs.ri_down  == oldsigs.ri_down  &&
2099                     cnow.exithunt    == cprev.exithunt   &&
2100                     cnow.rxidle      == cprev.rxidle) {
2101                         rc = -EIO;
2102                         break;
2103                 }
2104
2105                 events = mask &
2106                         ( (newsigs.dsr_up   != oldsigs.dsr_up   ? MgslEvent_DsrActive:0)   +
2107                           (newsigs.dsr_down != oldsigs.dsr_down ? MgslEvent_DsrInactive:0) +
2108                           (newsigs.dcd_up   != oldsigs.dcd_up   ? MgslEvent_DcdActive:0)   +
2109                           (newsigs.dcd_down != oldsigs.dcd_down ? MgslEvent_DcdInactive:0) +
2110                           (newsigs.cts_up   != oldsigs.cts_up   ? MgslEvent_CtsActive:0)   +
2111                           (newsigs.cts_down != oldsigs.cts_down ? MgslEvent_CtsInactive:0) +
2112                           (newsigs.ri_up    != oldsigs.ri_up    ? MgslEvent_RiActive:0)    +
2113                           (newsigs.ri_down  != oldsigs.ri_down  ? MgslEvent_RiInactive:0)  +
2114                           (cnow.exithunt    != cprev.exithunt   ? MgslEvent_ExitHuntMode:0) +
2115                           (cnow.rxidle      != cprev.rxidle     ? MgslEvent_IdleReceived:0) );
2116                 if (events)
2117                         break;
2118
2119                 cprev = cnow;
2120                 oldsigs = newsigs;
2121         }
2122
2123         remove_wait_queue(&info->event_wait_q, &wait);
2124         set_current_state(TASK_RUNNING);
2125
2126         if (mask & MgslEvent_ExitHuntMode) {
2127                 spin_lock_irqsave(&info->lock,flags);
2128                 if (!waitqueue_active(&info->event_wait_q))
2129                         irq_disable(info, CHA, IRQ_EXITHUNT);
2130                 spin_unlock_irqrestore(&info->lock,flags);
2131         }
2132 exit:
2133         if (rc == 0)
2134                 PUT_USER(rc, events, mask_ptr);
2135         return rc;
2136 }
2137
2138 static int modem_input_wait(MGSLPC_INFO *info,int arg)
2139 {
2140         unsigned long flags;
2141         int rc;
2142         struct mgsl_icount cprev, cnow;
2143         DECLARE_WAITQUEUE(wait, current);
2144
2145         /* save current irq counts */
2146         spin_lock_irqsave(&info->lock,flags);
2147         cprev = info->icount;
2148         add_wait_queue(&info->status_event_wait_q, &wait);
2149         set_current_state(TASK_INTERRUPTIBLE);
2150         spin_unlock_irqrestore(&info->lock,flags);
2151
2152         for(;;) {
2153                 schedule();
2154                 if (signal_pending(current)) {
2155                         rc = -ERESTARTSYS;
2156                         break;
2157                 }
2158
2159                 /* get new irq counts */
2160                 spin_lock_irqsave(&info->lock,flags);
2161                 cnow = info->icount;
2162                 set_current_state(TASK_INTERRUPTIBLE);
2163                 spin_unlock_irqrestore(&info->lock,flags);
2164
2165                 /* if no change, wait aborted for some reason */
2166                 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
2167                     cnow.dcd == cprev.dcd && cnow.cts == cprev.cts) {
2168                         rc = -EIO;
2169                         break;
2170                 }
2171
2172                 /* check for change in caller specified modem input */
2173                 if ((arg & TIOCM_RNG && cnow.rng != cprev.rng) ||
2174                     (arg & TIOCM_DSR && cnow.dsr != cprev.dsr) ||
2175                     (arg & TIOCM_CD  && cnow.dcd != cprev.dcd) ||
2176                     (arg & TIOCM_CTS && cnow.cts != cprev.cts)) {
2177                         rc = 0;
2178                         break;
2179                 }
2180
2181                 cprev = cnow;
2182         }
2183         remove_wait_queue(&info->status_event_wait_q, &wait);
2184         set_current_state(TASK_RUNNING);
2185         return rc;
2186 }
2187
2188 /* return the state of the serial control and status signals
2189  */
2190 static int tiocmget(struct tty_struct *tty, struct file *file)
2191 {
2192         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
2193         unsigned int result;
2194         unsigned long flags;
2195
2196         spin_lock_irqsave(&info->lock,flags);
2197         get_signals(info);
2198         spin_unlock_irqrestore(&info->lock,flags);
2199
2200         result = ((info->serial_signals & SerialSignal_RTS) ? TIOCM_RTS:0) +
2201                 ((info->serial_signals & SerialSignal_DTR) ? TIOCM_DTR:0) +
2202                 ((info->serial_signals & SerialSignal_DCD) ? TIOCM_CAR:0) +
2203                 ((info->serial_signals & SerialSignal_RI)  ? TIOCM_RNG:0) +
2204                 ((info->serial_signals & SerialSignal_DSR) ? TIOCM_DSR:0) +
2205                 ((info->serial_signals & SerialSignal_CTS) ? TIOCM_CTS:0);
2206
2207         if (debug_level >= DEBUG_LEVEL_INFO)
2208                 printk("%s(%d):%s tiocmget() value=%08X\n",
2209                          __FILE__,__LINE__, info->device_name, result );
2210         return result;
2211 }
2212
2213 /* set modem control signals (DTR/RTS)
2214  */
2215 static int tiocmset(struct tty_struct *tty, struct file *file,
2216                     unsigned int set, unsigned int clear)
2217 {
2218         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
2219         unsigned long flags;
2220
2221         if (debug_level >= DEBUG_LEVEL_INFO)
2222                 printk("%s(%d):%s tiocmset(%x,%x)\n",
2223                         __FILE__,__LINE__,info->device_name, set, clear);
2224
2225         if (set & TIOCM_RTS)
2226                 info->serial_signals |= SerialSignal_RTS;
2227         if (set & TIOCM_DTR)
2228                 info->serial_signals |= SerialSignal_DTR;
2229         if (clear & TIOCM_RTS)
2230                 info->serial_signals &= ~SerialSignal_RTS;
2231         if (clear & TIOCM_DTR)
2232                 info->serial_signals &= ~SerialSignal_DTR;
2233
2234         spin_lock_irqsave(&info->lock,flags);
2235         set_signals(info);
2236         spin_unlock_irqrestore(&info->lock,flags);
2237
2238         return 0;
2239 }
2240
2241 /* Set or clear transmit break condition
2242  *
2243  * Arguments:           tty             pointer to tty instance data
2244  *                      break_state     -1=set break condition, 0=clear
2245  */
2246 static void mgslpc_break(struct tty_struct *tty, int break_state)
2247 {
2248         MGSLPC_INFO * info = (MGSLPC_INFO *)tty->driver_data;
2249         unsigned long flags;
2250
2251         if (debug_level >= DEBUG_LEVEL_INFO)
2252                 printk("%s(%d):mgslpc_break(%s,%d)\n",
2253                          __FILE__,__LINE__, info->device_name, break_state);
2254
2255         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_break"))
2256                 return;
2257
2258         spin_lock_irqsave(&info->lock,flags);
2259         if (break_state == -1)
2260                 set_reg_bits(info, CHA+DAFO, BIT6);
2261         else
2262                 clear_reg_bits(info, CHA+DAFO, BIT6);
2263         spin_unlock_irqrestore(&info->lock,flags);
2264 }
2265
2266 /* Service an IOCTL request
2267  *
2268  * Arguments:
2269  *
2270  *      tty     pointer to tty instance data
2271  *      file    pointer to associated file object for device
2272  *      cmd     IOCTL command code
2273  *      arg     command argument/context
2274  *
2275  * Return Value:        0 if success, otherwise error code
2276  */
2277 static int mgslpc_ioctl(struct tty_struct *tty, struct file * file,
2278                         unsigned int cmd, unsigned long arg)
2279 {
2280         MGSLPC_INFO * info = (MGSLPC_INFO *)tty->driver_data;
2281
2282         if (debug_level >= DEBUG_LEVEL_INFO)
2283                 printk("%s(%d):mgslpc_ioctl %s cmd=%08X\n", __FILE__,__LINE__,
2284                         info->device_name, cmd );
2285
2286         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_ioctl"))
2287                 return -ENODEV;
2288
2289         if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
2290             (cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT)) {
2291                 if (tty->flags & (1 << TTY_IO_ERROR))
2292                     return -EIO;
2293         }
2294
2295         return ioctl_common(info, cmd, arg);
2296 }
2297
2298 static int ioctl_common(MGSLPC_INFO *info, unsigned int cmd, unsigned long arg)
2299 {
2300         int error;
2301         struct mgsl_icount cnow;        /* kernel counter temps */
2302         struct serial_icounter_struct __user *p_cuser;  /* user space */
2303         void __user *argp = (void __user *)arg;
2304         unsigned long flags;
2305
2306         switch (cmd) {
2307         case MGSL_IOCGPARAMS:
2308                 return get_params(info, argp);
2309         case MGSL_IOCSPARAMS:
2310                 return set_params(info, argp);
2311         case MGSL_IOCGTXIDLE:
2312                 return get_txidle(info, argp);
2313         case MGSL_IOCSTXIDLE:
2314                 return set_txidle(info, (int)arg);
2315         case MGSL_IOCGIF:
2316                 return get_interface(info, argp);
2317         case MGSL_IOCSIF:
2318                 return set_interface(info,(int)arg);
2319         case MGSL_IOCTXENABLE:
2320                 return set_txenable(info,(int)arg);
2321         case MGSL_IOCRXENABLE:
2322                 return set_rxenable(info,(int)arg);
2323         case MGSL_IOCTXABORT:
2324                 return tx_abort(info);
2325         case MGSL_IOCGSTATS:
2326                 return get_stats(info, argp);
2327         case MGSL_IOCWAITEVENT:
2328                 return wait_events(info, argp);
2329         case TIOCMIWAIT:
2330                 return modem_input_wait(info,(int)arg);
2331         case TIOCGICOUNT:
2332                 spin_lock_irqsave(&info->lock,flags);
2333                 cnow = info->icount;
2334                 spin_unlock_irqrestore(&info->lock,flags);
2335                 p_cuser = argp;
2336                 PUT_USER(error,cnow.cts, &p_cuser->cts);
2337                 if (error) return error;
2338                 PUT_USER(error,cnow.dsr, &p_cuser->dsr);
2339                 if (error) return error;
2340                 PUT_USER(error,cnow.rng, &p_cuser->rng);
2341                 if (error) return error;
2342                 PUT_USER(error,cnow.dcd, &p_cuser->dcd);
2343                 if (error) return error;
2344                 PUT_USER(error,cnow.rx, &p_cuser->rx);
2345                 if (error) return error;
2346                 PUT_USER(error,cnow.tx, &p_cuser->tx);
2347                 if (error) return error;
2348                 PUT_USER(error,cnow.frame, &p_cuser->frame);
2349                 if (error) return error;
2350                 PUT_USER(error,cnow.overrun, &p_cuser->overrun);
2351                 if (error) return error;
2352                 PUT_USER(error,cnow.parity, &p_cuser->parity);
2353                 if (error) return error;
2354                 PUT_USER(error,cnow.brk, &p_cuser->brk);
2355                 if (error) return error;
2356                 PUT_USER(error,cnow.buf_overrun, &p_cuser->buf_overrun);
2357                 if (error) return error;
2358                 return 0;
2359         default:
2360                 return -ENOIOCTLCMD;
2361         }
2362         return 0;
2363 }
2364
2365 /* Set new termios settings
2366  *
2367  * Arguments:
2368  *
2369  *      tty             pointer to tty structure
2370  *      termios         pointer to buffer to hold returned old termios
2371  */
2372 static void mgslpc_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
2373 {
2374         MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
2375         unsigned long flags;
2376
2377         if (debug_level >= DEBUG_LEVEL_INFO)
2378                 printk("%s(%d):mgslpc_set_termios %s\n", __FILE__,__LINE__,
2379                         tty->driver->name );
2380
2381         /* just return if nothing has changed */
2382         if ((tty->termios->c_cflag == old_termios->c_cflag)
2383             && (RELEVANT_IFLAG(tty->termios->c_iflag)
2384                 == RELEVANT_IFLAG(old_termios->c_iflag)))
2385           return;
2386
2387         mgslpc_change_params(info);
2388
2389         /* Handle transition to B0 status */
2390         if (old_termios->c_cflag & CBAUD &&
2391             !(tty->termios->c_cflag & CBAUD)) {
2392                 info->serial_signals &= ~(SerialSignal_RTS + SerialSignal_DTR);
2393                 spin_lock_irqsave(&info->lock,flags);
2394                 set_signals(info);
2395                 spin_unlock_irqrestore(&info->lock,flags);
2396         }
2397
2398         /* Handle transition away from B0 status */
2399         if (!(old_termios->c_cflag & CBAUD) &&
2400             tty->termios->c_cflag & CBAUD) {
2401                 info->serial_signals |= SerialSignal_DTR;
2402                 if (!(tty->termios->c_cflag & CRTSCTS) ||
2403                     !test_bit(TTY_THROTTLED, &tty->flags)) {
2404                         info->serial_signals |= SerialSignal_RTS;
2405                 }
2406                 spin_lock_irqsave(&info->lock,flags);
2407                 set_signals(info);
2408                 spin_unlock_irqrestore(&info->lock,flags);
2409         }
2410
2411         /* Handle turning off CRTSCTS */
2412         if (old_termios->c_cflag & CRTSCTS &&
2413             !(tty->termios->c_cflag & CRTSCTS)) {
2414                 tty->hw_stopped = 0;
2415                 tx_release(tty);
2416         }
2417 }
2418
2419 static void mgslpc_close(struct tty_struct *tty, struct file * filp)
2420 {
2421         MGSLPC_INFO * info = (MGSLPC_INFO *)tty->driver_data;
2422
2423         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_close"))
2424                 return;
2425
2426         if (debug_level >= DEBUG_LEVEL_INFO)
2427                 printk("%s(%d):mgslpc_close(%s) entry, count=%d\n",
2428                          __FILE__,__LINE__, info->device_name, info->count);
2429
2430         if (!info->count)
2431                 return;
2432
2433         if (tty_hung_up_p(filp))
2434                 goto cleanup;
2435
2436         if ((tty->count == 1) && (info->count != 1)) {
2437                 /*
2438                  * tty->count is 1 and the tty structure will be freed.
2439                  * info->count should be one in this case.
2440                  * if it's not, correct it so that the port is shutdown.
2441                  */
2442                 printk("mgslpc_close: bad refcount; tty->count is 1, "
2443                        "info->count is %d\n", info->count);
2444                 info->count = 1;
2445         }
2446
2447         info->count--;
2448
2449         /* if at least one open remaining, leave hardware active */
2450         if (info->count)
2451                 goto cleanup;
2452
2453         info->flags |= ASYNC_CLOSING;
2454
2455         /* set tty->closing to notify line discipline to
2456          * only process XON/XOFF characters. Only the N_TTY
2457          * discipline appears to use this (ppp does not).
2458          */
2459         tty->closing = 1;
2460
2461         /* wait for transmit data to clear all layers */
2462
2463         if (info->closing_wait != ASYNC_CLOSING_WAIT_NONE) {
2464                 if (debug_level >= DEBUG_LEVEL_INFO)
2465                         printk("%s(%d):mgslpc_close(%s) calling tty_wait_until_sent\n",
2466                                  __FILE__,__LINE__, info->device_name );
2467                 tty_wait_until_sent(tty, info->closing_wait);
2468         }
2469
2470         if (info->flags & ASYNC_INITIALIZED)
2471                 mgslpc_wait_until_sent(tty, info->timeout);
2472
2473         if (tty->driver->flush_buffer)
2474                 tty->driver->flush_buffer(tty);
2475
2476         ldisc_flush_buffer(tty);
2477
2478         shutdown(info);
2479
2480         tty->closing = 0;
2481         info->tty = NULL;
2482
2483         if (info->blocked_open) {
2484                 if (info->close_delay) {
2485                         msleep_interruptible(jiffies_to_msecs(info->close_delay));
2486                 }
2487                 wake_up_interruptible(&info->open_wait);
2488         }
2489
2490         info->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING);
2491
2492         wake_up_interruptible(&info->close_wait);
2493
2494 cleanup:
2495         if (debug_level >= DEBUG_LEVEL_INFO)
2496                 printk("%s(%d):mgslpc_close(%s) exit, count=%d\n", __FILE__,__LINE__,
2497                         tty->driver->name, info->count);
2498 }
2499
2500 /* Wait until the transmitter is empty.
2501  */
2502 static void mgslpc_wait_until_sent(struct tty_struct *tty, int timeout)
2503 {
2504         MGSLPC_INFO * info = (MGSLPC_INFO *)tty->driver_data;
2505         unsigned long orig_jiffies, char_time;
2506
2507         if (!info )
2508                 return;
2509
2510         if (debug_level >= DEBUG_LEVEL_INFO)
2511                 printk("%s(%d):mgslpc_wait_until_sent(%s) entry\n",
2512                          __FILE__,__LINE__, info->device_name );
2513
2514         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_wait_until_sent"))
2515                 return;
2516
2517         if (!(info->flags & ASYNC_INITIALIZED))
2518                 goto exit;
2519
2520         orig_jiffies = jiffies;
2521
2522         /* Set check interval to 1/5 of estimated time to
2523          * send a character, and make it at least 1. The check
2524          * interval should also be less than the timeout.
2525          * Note: use tight timings here to satisfy the NIST-PCTS.
2526          */
2527
2528         if ( info->params.data_rate ) {
2529                 char_time = info->timeout/(32 * 5);
2530                 if (!char_time)
2531                         char_time++;
2532         } else
2533                 char_time = 1;
2534
2535         if (timeout)
2536                 char_time = min_t(unsigned long, char_time, timeout);
2537
2538         if (info->params.mode == MGSL_MODE_HDLC) {
2539                 while (info->tx_active) {
2540                         msleep_interruptible(jiffies_to_msecs(char_time));
2541                         if (signal_pending(current))
2542                                 break;
2543                         if (timeout && time_after(jiffies, orig_jiffies + timeout))
2544                                 break;
2545                 }
2546         } else {
2547                 while ((info->tx_count || info->tx_active) &&
2548                         info->tx_enabled) {
2549                         msleep_interruptible(jiffies_to_msecs(char_time));
2550                         if (signal_pending(current))
2551                                 break;
2552                         if (timeout && time_after(jiffies, orig_jiffies + timeout))
2553                                 break;
2554                 }
2555         }
2556
2557 exit:
2558         if (debug_level >= DEBUG_LEVEL_INFO)
2559                 printk("%s(%d):mgslpc_wait_until_sent(%s) exit\n",
2560                          __FILE__,__LINE__, info->device_name );
2561 }
2562
2563 /* Called by tty_hangup() when a hangup is signaled.
2564  * This is the same as closing all open files for the port.
2565  */
2566 static void mgslpc_hangup(struct tty_struct *tty)
2567 {
2568         MGSLPC_INFO * info = (MGSLPC_INFO *)tty->driver_data;
2569
2570         if (debug_level >= DEBUG_LEVEL_INFO)
2571                 printk("%s(%d):mgslpc_hangup(%s)\n",
2572                          __FILE__,__LINE__, info->device_name );
2573
2574         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_hangup"))
2575                 return;
2576
2577         mgslpc_flush_buffer(tty);
2578         shutdown(info);
2579
2580         info->count = 0;
2581         info->flags &= ~ASYNC_NORMAL_ACTIVE;
2582         info->tty = NULL;
2583
2584         wake_up_interruptible(&info->open_wait);
2585 }
2586
2587 /* Block the current process until the specified port
2588  * is ready to be opened.
2589  */
2590 static int block_til_ready(struct tty_struct *tty, struct file *filp,
2591                            MGSLPC_INFO *info)
2592 {
2593         DECLARE_WAITQUEUE(wait, current);
2594         int             retval;
2595         int             do_clocal = 0, extra_count = 0;
2596         unsigned long   flags;
2597
2598         if (debug_level >= DEBUG_LEVEL_INFO)
2599                 printk("%s(%d):block_til_ready on %s\n",
2600                          __FILE__,__LINE__, tty->driver->name );
2601
2602         if (filp->f_flags & O_NONBLOCK || tty->flags & (1 << TTY_IO_ERROR)){
2603                 /* nonblock mode is set or port is not enabled */
2604                 /* just verify that callout device is not active */
2605                 info->flags |= ASYNC_NORMAL_ACTIVE;
2606                 return 0;
2607         }
2608
2609         if (tty->termios->c_cflag & CLOCAL)
2610                 do_clocal = 1;
2611
2612         /* Wait for carrier detect and the line to become
2613          * free (i.e., not in use by the callout).  While we are in
2614          * this loop, info->count is dropped by one, so that
2615          * mgslpc_close() knows when to free things.  We restore it upon
2616          * exit, either normal or abnormal.
2617          */
2618
2619         retval = 0;
2620         add_wait_queue(&info->open_wait, &wait);
2621
2622         if (debug_level >= DEBUG_LEVEL_INFO)
2623                 printk("%s(%d):block_til_ready before block on %s count=%d\n",
2624                          __FILE__,__LINE__, tty->driver->name, info->count );
2625
2626         spin_lock_irqsave(&info->lock, flags);
2627         if (!tty_hung_up_p(filp)) {
2628                 extra_count = 1;
2629                 info->count--;
2630         }
2631         spin_unlock_irqrestore(&info->lock, flags);
2632         info->blocked_open++;
2633
2634         while (1) {
2635                 if ((tty->termios->c_cflag & CBAUD)) {
2636                         spin_lock_irqsave(&info->lock,flags);
2637                         info->serial_signals |= SerialSignal_RTS + SerialSignal_DTR;
2638                         set_signals(info);
2639                         spin_unlock_irqrestore(&info->lock,flags);
2640                 }
2641
2642                 set_current_state(TASK_INTERRUPTIBLE);
2643
2644                 if (tty_hung_up_p(filp) || !(info->flags & ASYNC_INITIALIZED)){
2645                         retval = (info->flags & ASYNC_HUP_NOTIFY) ?
2646                                         -EAGAIN : -ERESTARTSYS;
2647                         break;
2648                 }
2649
2650                 spin_lock_irqsave(&info->lock,flags);
2651                 get_signals(info);
2652                 spin_unlock_irqrestore(&info->lock,flags);
2653
2654                 if (!(info->flags & ASYNC_CLOSING) &&
2655                     (do_clocal || (info->serial_signals & SerialSignal_DCD)) ) {
2656                         break;
2657                 }
2658
2659                 if (signal_pending(current)) {
2660                         retval = -ERESTARTSYS;
2661                         break;
2662                 }
2663
2664                 if (debug_level >= DEBUG_LEVEL_INFO)
2665                         printk("%s(%d):block_til_ready blocking on %s count=%d\n",
2666                                  __FILE__,__LINE__, tty->driver->name, info->count );
2667
2668                 schedule();
2669         }
2670
2671         set_current_state(TASK_RUNNING);
2672         remove_wait_queue(&info->open_wait, &wait);
2673
2674         if (extra_count)
2675                 info->count++;
2676         info->blocked_open--;
2677
2678         if (debug_level >= DEBUG_LEVEL_INFO)
2679                 printk("%s(%d):block_til_ready after blocking on %s count=%d\n",
2680                          __FILE__,__LINE__, tty->driver->name, info->count );
2681
2682         if (!retval)
2683                 info->flags |= ASYNC_NORMAL_ACTIVE;
2684
2685         return retval;
2686 }
2687
2688 static int mgslpc_open(struct tty_struct *tty, struct file * filp)
2689 {
2690         MGSLPC_INFO     *info;
2691         int                     retval, line;
2692         unsigned long flags;
2693
2694         /* verify range of specified line number */
2695         line = tty->index;
2696         if ((line < 0) || (line >= mgslpc_device_count)) {
2697                 printk("%s(%d):mgslpc_open with invalid line #%d.\n",
2698                         __FILE__,__LINE__,line);
2699                 return -ENODEV;
2700         }
2701
2702         /* find the info structure for the specified line */
2703         info = mgslpc_device_list;
2704         while(info && info->line != line)
2705                 info = info->next_device;
2706         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_open"))
2707                 return -ENODEV;
2708
2709         tty->driver_data = info;
2710         info->tty = tty;
2711
2712         if (debug_level >= DEBUG_LEVEL_INFO)
2713                 printk("%s(%d):mgslpc_open(%s), old ref count = %d\n",
2714                          __FILE__,__LINE__,tty->driver->name, info->count);
2715
2716         /* If port is closing, signal caller to try again */
2717         if (tty_hung_up_p(filp) || info->flags & ASYNC_CLOSING){
2718                 if (info->flags & ASYNC_CLOSING)
2719                         interruptible_sleep_on(&info->close_wait);
2720                 retval = ((info->flags & ASYNC_HUP_NOTIFY) ?
2721                         -EAGAIN : -ERESTARTSYS);
2722                 goto cleanup;
2723         }
2724
2725         info->tty->low_latency = (info->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
2726
2727         spin_lock_irqsave(&info->netlock, flags);
2728         if (info->netcount) {
2729                 retval = -EBUSY;
2730                 spin_unlock_irqrestore(&info->netlock, flags);
2731                 goto cleanup;
2732         }
2733         info->count++;
2734         spin_unlock_irqrestore(&info->netlock, flags);
2735
2736         if (info->count == 1) {
2737                 /* 1st open on this device, init hardware */
2738                 retval = startup(info);
2739                 if (retval < 0)
2740                         goto cleanup;
2741         }
2742
2743         retval = block_til_ready(tty, filp, info);
2744         if (retval) {
2745                 if (debug_level >= DEBUG_LEVEL_INFO)
2746                         printk("%s(%d):block_til_ready(%s) returned %d\n",
2747                                  __FILE__,__LINE__, info->device_name, retval);
2748                 goto cleanup;
2749         }
2750
2751         if (debug_level >= DEBUG_LEVEL_INFO)
2752                 printk("%s(%d):mgslpc_open(%s) success\n",
2753                          __FILE__,__LINE__, info->device_name);
2754         retval = 0;
2755
2756 cleanup:
2757         if (retval) {
2758                 if (tty->count == 1)
2759                         info->tty = NULL; /* tty layer will release tty struct */
2760                 if(info->count)
2761                         info->count--;
2762         }
2763
2764         return retval;
2765 }
2766
2767 /*
2768  * /proc fs routines....
2769  */
2770
2771 static inline int line_info(char *buf, MGSLPC_INFO *info)
2772 {
2773         char    stat_buf[30];
2774         int     ret;
2775         unsigned long flags;
2776
2777         ret = sprintf(buf, "%s:io:%04X irq:%d",
2778                       info->device_name, info->io_base, info->irq_level);
2779
2780         /* output current serial signal states */
2781         spin_lock_irqsave(&info->lock,flags);
2782         get_signals(info);
2783         spin_unlock_irqrestore(&info->lock,flags);
2784
2785         stat_buf[0] = 0;
2786         stat_buf[1] = 0;
2787         if (info->serial_signals & SerialSignal_RTS)
2788                 strcat(stat_buf, "|RTS");
2789         if (info->serial_signals & SerialSignal_CTS)
2790                 strcat(stat_buf, "|CTS");
2791         if (info->serial_signals & SerialSignal_DTR)
2792                 strcat(stat_buf, "|DTR");
2793         if (info->serial_signals & SerialSignal_DSR)
2794                 strcat(stat_buf, "|DSR");
2795         if (info->serial_signals & SerialSignal_DCD)
2796                 strcat(stat_buf, "|CD");
2797         if (info->serial_signals & SerialSignal_RI)
2798                 strcat(stat_buf, "|RI");
2799
2800         if (info->params.mode == MGSL_MODE_HDLC) {
2801                 ret += sprintf(buf+ret, " HDLC txok:%d rxok:%d",
2802                               info->icount.txok, info->icount.rxok);
2803                 if (info->icount.txunder)
2804                         ret += sprintf(buf+ret, " txunder:%d", info->icount.txunder);
2805                 if (info->icount.txabort)
2806                         ret += sprintf(buf+ret, " txabort:%d", info->icount.txabort);
2807                 if (info->icount.rxshort)
2808                         ret += sprintf(buf+ret, " rxshort:%d", info->icount.rxshort);
2809                 if (info->icount.rxlong)
2810                         ret += sprintf(buf+ret, " rxlong:%d", info->icount.rxlong);
2811                 if (info->icount.rxover)
2812                         ret += sprintf(buf+ret, " rxover:%d", info->icount.rxover);
2813                 if (info->icount.rxcrc)
2814                         ret += sprintf(buf+ret, " rxcrc:%d", info->icount.rxcrc);
2815         } else {
2816                 ret += sprintf(buf+ret, " ASYNC tx:%d rx:%d",
2817                               info->icount.tx, info->icount.rx);
2818                 if (info->icount.frame)
2819                         ret += sprintf(buf+ret, " fe:%d", info->icount.frame);
2820                 if (info->icount.parity)
2821                         ret += sprintf(buf+ret, " pe:%d", info->icount.parity);
2822                 if (info->icount.brk)
2823                         ret += sprintf(buf+ret, " brk:%d", info->icount.brk);
2824                 if (info->icount.overrun)
2825                         ret += sprintf(buf+ret, " oe:%d", info->icount.overrun);
2826         }
2827
2828         /* Append serial signal status to end */
2829         ret += sprintf(buf+ret, " %s\n", stat_buf+1);
2830
2831         ret += sprintf(buf+ret, "txactive=%d bh_req=%d bh_run=%d pending_bh=%x\n",
2832                        info->tx_active,info->bh_requested,info->bh_running,
2833                        info->pending_bh);
2834
2835         return ret;
2836 }
2837
2838 /* Called to print information about devices
2839  */
2840 static int mgslpc_read_proc(char *page, char **start, off_t off, int count,
2841                  int *eof, void *data)
2842 {
2843         int len = 0, l;
2844         off_t   begin = 0;
2845         MGSLPC_INFO *info;
2846
2847         len += sprintf(page, "synclink driver:%s\n", driver_version);
2848
2849         info = mgslpc_device_list;
2850         while( info ) {
2851                 l = line_info(page + len, info);
2852                 len += l;
2853                 if (len+begin > off+count)
2854                         goto done;
2855                 if (len+begin < off) {
2856                         begin += len;
2857                         len = 0;
2858                 }
2859                 info = info->next_device;
2860         }
2861
2862         *eof = 1;
2863 done:
2864         if (off >= len+begin)
2865                 return 0;
2866         *start = page + (off-begin);
2867         return ((count < begin+len-off) ? count : begin+len-off);
2868 }
2869
2870 static int rx_alloc_buffers(MGSLPC_INFO *info)
2871 {
2872         /* each buffer has header and data */
2873         info->rx_buf_size = sizeof(RXBUF) + info->max_frame_size;
2874
2875         /* calculate total allocation size for 8 buffers */
2876         info->rx_buf_total_size = info->rx_buf_size * 8;
2877
2878         /* limit total allocated memory */
2879         if (info->rx_buf_total_size > 0x10000)
2880                 info->rx_buf_total_size = 0x10000;
2881
2882         /* calculate number of buffers */
2883         info->rx_buf_count = info->rx_buf_total_size / info->rx_buf_size;
2884
2885         info->rx_buf = kmalloc(info->rx_buf_total_size, GFP_KERNEL);
2886         if (info->rx_buf == NULL)
2887                 return -ENOMEM;
2888
2889         rx_reset_buffers(info);
2890         return 0;
2891 }
2892
2893 static void rx_free_buffers(MGSLPC_INFO *info)
2894 {
2895         kfree(info->rx_buf);
2896         info->rx_buf = NULL;
2897 }
2898
2899 static int claim_resources(MGSLPC_INFO *info)
2900 {
2901         if (rx_alloc_buffers(info) < 0 ) {
2902                 printk( "Cant allocate rx buffer %s\n", info->device_name);
2903                 release_resources(info);
2904                 return -ENODEV;
2905         }
2906         return 0;
2907 }
2908
2909 static void release_resources(MGSLPC_INFO *info)
2910 {
2911         if (debug_level >= DEBUG_LEVEL_INFO)
2912                 printk("release_resources(%s)\n", info->device_name);
2913         rx_free_buffers(info);
2914 }
2915
2916 /* Add the specified device instance data structure to the
2917  * global linked list of devices and increment the device count.
2918  *
2919  * Arguments:           info    pointer to device instance data
2920  */
2921 static void mgslpc_add_device(MGSLPC_INFO *info)
2922 {
2923         info->next_device = NULL;
2924         info->line = mgslpc_device_count;
2925         sprintf(info->device_name,"ttySLP%d",info->line);
2926
2927         if (info->line < MAX_DEVICE_COUNT) {
2928                 if (maxframe[info->line])
2929                         info->max_frame_size = maxframe[info->line];
2930                 info->dosyncppp = dosyncppp[info->line];
2931         }
2932
2933         mgslpc_device_count++;
2934
2935         if (!mgslpc_device_list)
2936                 mgslpc_device_list = info;
2937         else {
2938                 MGSLPC_INFO *current_dev = mgslpc_device_list;
2939                 while( current_dev->next_device )
2940                         current_dev = current_dev->next_device;
2941                 current_dev->next_device = info;
2942         }
2943
2944         if (info->max_frame_size < 4096)
2945                 info->max_frame_size = 4096;
2946         else if (info->max_frame_size > 65535)
2947                 info->max_frame_size = 65535;
2948
2949         printk( "SyncLink PC Card %s:IO=%04X IRQ=%d\n",
2950                 info->device_name, info->io_base, info->irq_level);
2951
2952 #if SYNCLINK_GENERIC_HDLC
2953         hdlcdev_init(info);
2954 #endif
2955 }
2956
2957 static void mgslpc_remove_device(MGSLPC_INFO *remove_info)
2958 {
2959         MGSLPC_INFO *info = mgslpc_device_list;
2960         MGSLPC_INFO *last = NULL;
2961
2962         while(info) {
2963                 if (info == remove_info) {
2964                         if (last)
2965                                 last->next_device = info->next_device;
2966                         else
2967                                 mgslpc_device_list = info->next_device;
2968 #if SYNCLINK_GENERIC_HDLC
2969                         hdlcdev_exit(info);
2970 #endif
2971                         release_resources(info);
2972                         kfree(info);
2973                         mgslpc_device_count--;
2974                         return;
2975                 }
2976                 last = info;
2977                 info = info->next_device;
2978         }
2979 }
2980
2981 static struct pcmcia_device_id mgslpc_ids[] = {
2982         PCMCIA_DEVICE_MANF_CARD(0x02c5, 0x0050),
2983         PCMCIA_DEVICE_NULL
2984 };
2985 MODULE_DEVICE_TABLE(pcmcia, mgslpc_ids);
2986
2987 static struct pcmcia_driver mgslpc_driver = {
2988         .owner          = THIS_MODULE,
2989         .drv            = {
2990                 .name   = "synclink_cs",
2991         },
2992         .probe          = mgslpc_probe,
2993         .remove         = mgslpc_detach,
2994         .id_table       = mgslpc_ids,
2995         .suspend        = mgslpc_suspend,
2996         .resume         = mgslpc_resume,
2997 };
2998
2999 static const struct tty_operations mgslpc_ops = {
3000         .open = mgslpc_open,
3001         .close = mgslpc_close,
3002         .write = mgslpc_write,
3003         .put_char = mgslpc_put_char,
3004         .flush_chars = mgslpc_flush_chars,
3005         .write_room = mgslpc_write_room,
3006         .chars_in_buffer = mgslpc_chars_in_buffer,
3007         .flush_buffer = mgslpc_flush_buffer,
3008         .ioctl = mgslpc_ioctl,
3009         .throttle = mgslpc_throttle,
3010         .unthrottle = mgslpc_unthrottle,
3011         .send_xchar = mgslpc_send_xchar,
3012         .break_ctl = mgslpc_break,
3013         .wait_until_sent = mgslpc_wait_until_sent,
3014         .read_proc = mgslpc_read_proc,
3015         .set_termios = mgslpc_set_termios,
3016         .stop = tx_pause,
3017         .start = tx_release,
3018         .hangup = mgslpc_hangup,
3019         .tiocmget = tiocmget,
3020         .tiocmset = tiocmset,
3021 };
3022
3023 static void synclink_cs_cleanup(void)
3024 {
3025         int rc;
3026
3027         printk("Unloading %s: version %s\n", driver_name, driver_version);
3028
3029         while(mgslpc_device_list)
3030                 mgslpc_remove_device(mgslpc_device_list);
3031
3032         if (serial_driver) {
3033                 if ((rc = tty_unregister_driver(serial_driver)))
3034                         printk("%s(%d) failed to unregister tty driver err=%d\n",
3035                                __FILE__,__LINE__,rc);
3036                 put_tty_driver(serial_driver);
3037         }
3038
3039         pcmcia_unregister_driver(&mgslpc_driver);
3040 }
3041
3042 static int __init synclink_cs_init(void)
3043 {
3044     int rc;
3045
3046     if (break_on_load) {
3047             mgslpc_get_text_ptr();
3048             BREAKPOINT();
3049     }
3050
3051     printk("%s %s\n", driver_name, driver_version);
3052
3053     if ((rc = pcmcia_register_driver(&mgslpc_driver)) < 0)
3054             return rc;
3055
3056     serial_driver = alloc_tty_driver(MAX_DEVICE_COUNT);
3057     if (!serial_driver) {
3058             rc = -ENOMEM;
3059             goto error;
3060     }
3061
3062     /* Initialize the tty_driver structure */
3063
3064     serial_driver->owner = THIS_MODULE;
3065     serial_driver->driver_name = "synclink_cs";
3066     serial_driver->name = "ttySLP";
3067     serial_driver->major = ttymajor;
3068     serial_driver->minor_start = 64;
3069     serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
3070     serial_driver->subtype = SERIAL_TYPE_NORMAL;
3071     serial_driver->init_termios = tty_std_termios;
3072     serial_driver->init_termios.c_cflag =
3073             B9600 | CS8 | CREAD | HUPCL | CLOCAL;
3074     serial_driver->flags = TTY_DRIVER_REAL_RAW;
3075     tty_set_operations(serial_driver, &mgslpc_ops);
3076
3077     if ((rc = tty_register_driver(serial_driver)) < 0) {
3078             printk("%s(%d):Couldn't register serial driver\n",
3079                    __FILE__,__LINE__);
3080             put_tty_driver(serial_driver);
3081             serial_driver = NULL;
3082             goto error;
3083     }
3084
3085     printk("%s %s, tty major#%d\n",
3086            driver_name, driver_version,
3087            serial_driver->major);
3088
3089     return 0;
3090
3091 error:
3092     synclink_cs_cleanup();
3093     return rc;
3094 }
3095
3096 static void __exit synclink_cs_exit(void)
3097 {
3098         synclink_cs_cleanup();
3099 }
3100
3101 module_init(synclink_cs_init);
3102 module_exit(synclink_cs_exit);
3103
3104 static void mgslpc_set_rate(MGSLPC_INFO *info, unsigned char channel, unsigned int rate)
3105 {
3106         unsigned int M, N;
3107         unsigned char val;
3108
3109         /* note:standard BRG mode is broken in V3.2 chip
3110          * so enhanced mode is always used
3111          */
3112
3113         if (rate) {
3114                 N = 3686400 / rate;
3115                 if (!N)
3116                         N = 1;
3117                 N >>= 1;
3118                 for (M = 1; N > 64 && M < 16; M++)
3119                         N >>= 1;
3120                 N--;
3121
3122                 /* BGR[5..0] = N
3123                  * BGR[9..6] = M
3124                  * BGR[7..0] contained in BGR register
3125                  * BGR[9..8] contained in CCR2[7..6]
3126                  * divisor = (N+1)*2^M
3127                  *
3128                  * Note: M *must* not be zero (causes asymetric duty cycle)
3129                  */
3130                 write_reg(info, (unsigned char) (channel + BGR),
3131                                   (unsigned char) ((M << 6) + N));
3132                 val = read_reg(info, (unsigned char) (channel + CCR2)) & 0x3f;
3133                 val |= ((M << 4) & 0xc0);
3134                 write_reg(info, (unsigned char) (channel + CCR2), val);
3135         }
3136 }
3137
3138 /* Enabled the AUX clock output at the specified frequency.
3139  */
3140 static void enable_auxclk(MGSLPC_INFO *info)
3141 {
3142         unsigned char val;
3143
3144         /* MODE
3145          *
3146          * 07..06  MDS[1..0] 10 = transparent HDLC mode
3147          * 05      ADM Address Mode, 0 = no addr recognition
3148          * 04      TMD Timer Mode, 0 = external
3149          * 03      RAC Receiver Active, 0 = inactive
3150          * 02      RTS 0=RTS active during xmit, 1=RTS always active
3151          * 01      TRS Timer Resolution, 1=512
3152          * 00      TLP Test Loop, 0 = no loop
3153          *
3154          * 1000 0010
3155          */
3156         val = 0x82;
3157
3158         /* channel B RTS is used to enable AUXCLK driver on SP505 */
3159         if (info->params.mode == MGSL_MODE_HDLC && info->params.clock_speed)
3160                 val |= BIT2;
3161         write_reg(info, CHB + MODE, val);
3162
3163         /* CCR0
3164          *
3165          * 07      PU Power Up, 1=active, 0=power down
3166          * 06      MCE Master Clock Enable, 1=enabled
3167          * 05      Reserved, 0
3168          * 04..02  SC[2..0] Encoding
3169          * 01..00  SM[1..0] Serial Mode, 00=HDLC
3170          *
3171          * 11000000
3172          */
3173         write_reg(info, CHB + CCR0, 0xc0);
3174
3175         /* CCR1
3176          *
3177          * 07      SFLG Shared Flag, 0 = disable shared flags
3178          * 06      GALP Go Active On Loop, 0 = not used
3179          * 05      GLP Go On Loop, 0 = not used
3180          * 04      ODS Output Driver Select, 1=TxD is push-pull output
3181          * 03      ITF Interframe Time Fill, 0=mark, 1=flag
3182          * 02..00  CM[2..0] Clock Mode
3183          *
3184          * 0001 0111
3185          */
3186         write_reg(info, CHB + CCR1, 0x17);
3187
3188         /* CCR2 (Channel B)
3189          *
3190          * 07..06  BGR[9..8] Baud rate bits 9..8
3191          * 05      BDF Baud rate divisor factor, 0=1, 1=BGR value
3192          * 04      SSEL Clock source select, 1=submode b
3193          * 03      TOE 0=TxCLK is input, 1=TxCLK is output
3194          * 02      RWX Read/Write Exchange 0=disabled
3195          * 01      C32, CRC select, 0=CRC-16, 1=CRC-32
3196          * 00      DIV, data inversion 0=disabled, 1=enabled
3197          *
3198          * 0011 1000
3199          */
3200         if (info->params.mode == MGSL_MODE_HDLC && info->params.clock_speed)
3201                 write_reg(info, CHB + CCR2, 0x38);
3202         else
3203                 write_reg(info, CHB + CCR2, 0x30);
3204
3205         /* CCR4
3206          *
3207          * 07      MCK4 Master Clock Divide by 4, 1=enabled
3208          * 06      EBRG Enhanced Baud Rate Generator Mode, 1=enabled
3209          * 05      TST1 Test Pin, 0=normal operation
3210          * 04      ICD Ivert Carrier Detect, 1=enabled (active low)
3211          * 03..02  Reserved, must be 0
3212          * 01..00  RFT[1..0] RxFIFO Threshold 00=32 bytes
3213          *
3214          * 0101 0000
3215          */
3216         write_reg(info, CHB + CCR4, 0x50);
3217
3218         /* if auxclk not enabled, set internal BRG so
3219          * CTS transitions can be detected (requires TxC)
3220          */
3221         if (info->params.mode == MGSL_MODE_HDLC && info->params.clock_speed)
3222                 mgslpc_set_rate(info, CHB, info->params.clock_speed);
3223         else
3224                 mgslpc_set_rate(info, CHB, 921600);
3225 }
3226
3227 static void loopback_enable(MGSLPC_INFO *info)
3228 {
3229         unsigned char val;
3230
3231         /* CCR1:02..00  CM[2..0] Clock Mode = 111 (clock mode 7) */
3232         val = read_reg(info, CHA + CCR1) | (BIT2 + BIT1 + BIT0);
3233         write_reg(info, CHA + CCR1, val);
3234
3235         /* CCR2:04 SSEL Clock source select, 1=submode b */
3236         val = read_reg(info, CHA + CCR2) | (BIT4 + BIT5);
3237         write_reg(info, CHA + CCR2, val);
3238
3239         /* set LinkSpeed if available, otherwise default to 2Mbps */
3240         if (info->params.clock_speed)
3241                 mgslpc_set_rate(info, CHA, info->params.clock_speed);
3242         else
3243                 mgslpc_set_rate(info, CHA, 1843200);
3244
3245         /* MODE:00 TLP Test Loop, 1=loopback enabled */
3246         val = read_reg(info, CHA + MODE) | BIT0;
3247         write_reg(info, CHA + MODE, val);
3248 }
3249
3250 static void hdlc_mode(MGSLPC_INFO *info)
3251 {
3252         unsigned char val;
3253         unsigned char clkmode, clksubmode;
3254
3255         /* disable all interrupts */
3256         irq_disable(info, CHA, 0xffff);
3257         irq_disable(info, CHB, 0xffff);
3258         port_irq_disable(info, 0xff);
3259
3260         /* assume clock mode 0a, rcv=RxC xmt=TxC */
3261         clkmode = clksubmode = 0;
3262         if (info->params.flags & HDLC_FLAG_RXC_DPLL
3263             && info->params.flags & HDLC_FLAG_TXC_DPLL) {
3264                 /* clock mode 7a, rcv = DPLL, xmt = DPLL */
3265                 clkmode = 7;
3266         } else if (info->params.flags & HDLC_FLAG_RXC_BRG
3267                  && info->params.flags & HDLC_FLAG_TXC_BRG) {
3268                 /* clock mode 7b, rcv = BRG, xmt = BRG */
3269                 clkmode = 7;
3270                 clksubmode = 1;
3271         } else if (info->params.flags & HDLC_FLAG_RXC_DPLL) {
3272                 if (info->params.flags & HDLC_FLAG_TXC_BRG) {
3273                         /* clock mode 6b, rcv = DPLL, xmt = BRG/16 */
3274                         clkmode = 6;
3275                         clksubmode = 1;
3276                 } else {
3277                         /* clock mode 6a, rcv = DPLL, xmt = TxC */
3278                         clkmode = 6;
3279                 }
3280         } else if (info->params.flags & HDLC_FLAG_TXC_BRG) {
3281                 /* clock mode 0b, rcv = RxC, xmt = BRG */
3282                 clksubmode = 1;
3283         }
3284
3285         /* MODE
3286          *
3287          * 07..06  MDS[1..0] 10 = transparent HDLC mode
3288          * 05      ADM Address Mode, 0 = no addr recognition
3289          * 04      TMD Timer Mode, 0 = external
3290          * 03      RAC Receiver Active, 0 = inactive
3291          * 02      RTS 0=RTS active during xmit, 1=RTS always active
3292          * 01      TRS Timer Resolution, 1=512
3293          * 00      TLP Test Loop, 0 = no loop
3294          *
3295          * 1000 0010
3296          */
3297         val = 0x82;
3298         if (info->params.loopback)
3299                 val |= BIT0;
3300
3301         /* preserve RTS state */
3302         if (info->serial_signals & SerialSignal_RTS)
3303                 val |= BIT2;
3304         write_reg(info, CHA + MODE, val);
3305
3306         /* CCR0
3307          *
3308          * 07      PU Power Up, 1=active, 0=power down
3309          * 06      MCE Master Clock Enable, 1=enabled
3310          * 05      Reserved, 0
3311          * 04..02  SC[2..0] Encoding
3312          * 01..00  SM[1..0] Serial Mode, 00=HDLC
3313          *
3314          * 11000000
3315          */
3316         val = 0xc0;
3317         switch (info->params.encoding)
3318         {
3319         case HDLC_ENCODING_NRZI:
3320                 val |= BIT3;
3321                 break;
3322         case HDLC_ENCODING_BIPHASE_SPACE:
3323                 val |= BIT4;
3324                 break;          // FM0
3325         case HDLC_ENCODING_BIPHASE_MARK:
3326                 val |= BIT4 + BIT2;
3327                 break;          // FM1
3328         case HDLC_ENCODING_BIPHASE_LEVEL:
3329                 val |= BIT4 + BIT3;
3330                 break;          // Manchester
3331         }
3332         write_reg(info, CHA + CCR0, val);
3333
3334         /* CCR1
3335          *
3336          * 07      SFLG Shared Flag, 0 = disable shared flags
3337          * 06      GALP Go Active On Loop, 0 = not used
3338          * 05      GLP Go On Loop, 0 = not used
3339          * 04      ODS Output Driver Select, 1=TxD is push-pull output
3340          * 03      ITF Interframe Time Fill, 0=mark, 1=flag
3341          * 02..00  CM[2..0] Clock Mode
3342          *
3343          * 0001 0000
3344          */
3345         val = 0x10 + clkmode;
3346         write_reg(info, CHA + CCR1, val);
3347
3348         /* CCR2
3349          *
3350          * 07..06  BGR[9..8] Baud rate bits 9..8
3351          * 05      BDF Baud rate divisor factor, 0=1, 1=BGR value
3352          * 04      SSEL Clock source select, 1=submode b
3353          * 03      TOE 0=TxCLK is input, 0=TxCLK is input
3354          * 02      RWX Read/Write Exchange 0=disabled
3355          * 01      C32, CRC select, 0=CRC-16, 1=CRC-32
3356          * 00      DIV, data inversion 0=disabled, 1=enabled
3357          *
3358          * 0000 0000
3359          */
3360         val = 0x00;
3361         if (clkmode == 2 || clkmode == 3 || clkmode == 6
3362             || clkmode == 7 || (clkmode == 0 && clksubmode == 1))
3363                 val |= BIT5;
3364         if (clksubmode)
3365                 val |= BIT4;
3366         if (info->params.crc_type == HDLC_CRC_32_CCITT)
3367                 val |= BIT1;
3368         if (info->params.encoding == HDLC_ENCODING_NRZB)
3369                 val |= BIT0;
3370         write_reg(info, CHA + CCR2, val);
3371
3372         /* CCR3
3373          *
3374          * 07..06  PRE[1..0] Preamble count 00=1, 01=2, 10=4, 11=8
3375          * 05      EPT Enable preamble transmission, 1=enabled
3376          * 04      RADD Receive address pushed to FIFO, 0=disabled
3377          * 03      CRL CRC Reset Level, 0=FFFF
3378          * 02      RCRC Rx CRC 0=On 1=Off
3379          * 01      TCRC Tx CRC 0=On 1=Off
3380          * 00      PSD DPLL Phase Shift Disable
3381          *
3382          * 0000 0000
3383          */
3384         val = 0x00;
3385         if (info->params.crc_type == HDLC_CRC_NONE)
3386                 val |= BIT2 + BIT1;
3387         if (info->params.preamble != HDLC_PREAMBLE_PATTERN_NONE)
3388                 val |= BIT5;
3389         switch (info->params.preamble_length)
3390         {
3391         case HDLC_PREAMBLE_LENGTH_16BITS:
3392                 val |= BIT6;
3393                 break;
3394         case HDLC_PREAMBLE_LENGTH_32BITS:
3395                 val |= BIT6;
3396                 break;
3397         case HDLC_PREAMBLE_LENGTH_64BITS:
3398                 val |= BIT7 + BIT6;
3399                 break;
3400         }
3401         write_reg(info, CHA + CCR3, val);
3402
3403         /* PRE - Preamble pattern */
3404         val = 0;
3405         switch (info->params.preamble)
3406         {
3407         case HDLC_PREAMBLE_PATTERN_FLAGS: val = 0x7e; break;
3408         case HDLC_PREAMBLE_PATTERN_10:    val = 0xaa; break;
3409         case HDLC_PREAMBLE_PATTERN_01:    val = 0x55; break;
3410         case HDLC_PREAMBLE_PATTERN_ONES:  val = 0xff; break;
3411         }
3412         write_reg(info, CHA + PRE, val);
3413
3414         /* CCR4
3415          *
3416          * 07      MCK4 Master Clock Divide by 4, 1=enabled
3417          * 06      EBRG Enhanced Baud Rate Generator Mode, 1=enabled
3418          * 05      TST1 Test Pin, 0=normal operation
3419          * 04      ICD Ivert Carrier Detect, 1=enabled (active low)
3420          * 03..02  Reserved, must be 0
3421          * 01..00  RFT[1..0] RxFIFO Threshold 00=32 bytes
3422          *
3423          * 0101 0000
3424          */
3425         val = 0x50;
3426         write_reg(info, CHA + CCR4, val);
3427         if (info->params.flags & HDLC_FLAG_RXC_DPLL)
3428                 mgslpc_set_rate(info, CHA, info->params.clock_speed * 16);
3429         else
3430                 mgslpc_set_rate(info, CHA, info->params.clock_speed);
3431
3432         /* RLCR Receive length check register
3433          *
3434          * 7     1=enable receive length check
3435          * 6..0  Max frame length = (RL + 1) * 32
3436          */
3437         write_reg(info, CHA + RLCR, 0);
3438
3439         /* XBCH Transmit Byte Count High
3440          *
3441          * 07      DMA mode, 0 = interrupt driven
3442          * 06      NRM, 0=ABM (ignored)
3443          * 05      CAS Carrier Auto Start
3444          * 04      XC Transmit Continuously (ignored)
3445          * 03..00  XBC[10..8] Transmit byte count bits 10..8
3446          *
3447          * 0000 0000
3448          */
3449         val = 0x00;
3450         if (info->params.flags & HDLC_FLAG_AUTO_DCD)
3451                 val |= BIT5;
3452         write_reg(info, CHA + XBCH, val);
3453         enable_auxclk(info);
3454         if (info->params.loopback || info->testing_irq)
3455                 loopback_enable(info);
3456         if (info->params.flags & HDLC_FLAG_AUTO_CTS)
3457         {
3458                 irq_enable(info, CHB, IRQ_CTS);
3459                 /* PVR[3] 1=AUTO CTS active */
3460                 set_reg_bits(info, CHA + PVR, BIT3);
3461         } else
3462                 clear_reg_bits(info, CHA + PVR, BIT3);
3463
3464         irq_enable(info, CHA,
3465                          IRQ_RXEOM + IRQ_RXFIFO + IRQ_ALLSENT +
3466                          IRQ_UNDERRUN + IRQ_TXFIFO);
3467         issue_command(info, CHA, CMD_TXRESET + CMD_RXRESET);
3468         wait_command_complete(info, CHA);
3469         read_reg16(info, CHA + ISR);    /* clear pending IRQs */
3470
3471         /* Master clock mode enabled above to allow reset commands
3472          * to complete even if no data clocks are present.
3473          *
3474          * Disable master clock mode for normal communications because
3475          * V3.2 of the ESCC2 has a bug that prevents the transmit all sent
3476          * IRQ when in master clock mode.
3477          *
3478          * Leave master clock mode enabled for IRQ test because the
3479          * timer IRQ used by the test can only happen in master clock mode.
3480          */
3481         if (!info->testing_irq)
3482                 clear_reg_bits(info, CHA + CCR0, BIT6);
3483
3484         tx_set_idle(info);
3485
3486         tx_stop(info);
3487         rx_stop(info);
3488 }
3489
3490 static void rx_stop(MGSLPC_INFO *info)
3491 {
3492         if (debug_level >= DEBUG_LEVEL_ISR)
3493                 printk("%s(%d):rx_stop(%s)\n",
3494                          __FILE__,__LINE__, info->device_name );
3495
3496         /* MODE:03 RAC Receiver Active, 0=inactive */
3497         clear_reg_bits(info, CHA + MODE, BIT3);
3498
3499         info->rx_enabled = 0;
3500         info->rx_overflow = 0;
3501 }
3502
3503 static void rx_start(MGSLPC_INFO *info)
3504 {
3505         if (debug_level >= DEBUG_LEVEL_ISR)
3506                 printk("%s(%d):rx_start(%s)\n",
3507                          __FILE__,__LINE__, info->device_name );
3508
3509         rx_reset_buffers(info);
3510         info->rx_enabled = 0;
3511         info->rx_overflow = 0;
3512
3513         /* MODE:03 RAC Receiver Active, 1=active */
3514         set_reg_bits(info, CHA + MODE, BIT3);
3515
3516         info->rx_enabled = 1;
3517 }
3518
3519 static void tx_start(MGSLPC_INFO *info)
3520 {
3521         if (debug_level >= DEBUG_LEVEL_ISR)
3522                 printk("%s(%d):tx_start(%s)\n",
3523                          __FILE__,__LINE__, info->device_name );
3524
3525         if (info->tx_count) {
3526                 /* If auto RTS enabled and RTS is inactive, then assert */
3527                 /* RTS and set a flag indicating that the driver should */
3528                 /* negate RTS when the transmission completes. */
3529                 info->drop_rts_on_tx_done = 0;
3530
3531                 if (info->params.flags & HDLC_FLAG_AUTO_RTS) {
3532                         get_signals(info);
3533                         if (!(info->serial_signals & SerialSignal_RTS)) {
3534                                 info->serial_signals |= SerialSignal_RTS;
3535                                 set_signals(info);
3536                                 info->drop_rts_on_tx_done = 1;
3537                         }
3538                 }
3539
3540                 if (info->params.mode == MGSL_MODE_ASYNC) {
3541                         if (!info->tx_active) {
3542                                 info->tx_active = 1;
3543                                 tx_ready(info);
3544                         }
3545                 } else {
3546                         info->tx_active = 1;
3547                         tx_ready(info);
3548                         mod_timer(&info->tx_timer, jiffies +
3549                                         msecs_to_jiffies(5000));
3550                 }
3551         }
3552
3553         if (!info->tx_enabled)
3554                 info->tx_enabled = 1;
3555 }
3556
3557 static void tx_stop(MGSLPC_INFO *info)
3558 {
3559         if (debug_level >= DEBUG_LEVEL_ISR)
3560                 printk("%s(%d):tx_stop(%s)\n",
3561                          __FILE__,__LINE__, info->device_name );
3562
3563         del_timer(&info->tx_timer);
3564
3565         info->tx_enabled = 0;
3566         info->tx_active  = 0;
3567 }
3568
3569 /* Reset the adapter to a known state and prepare it for further use.
3570  */
3571 static void reset_device(MGSLPC_INFO *info)
3572 {
3573         /* power up both channels (set BIT7) */
3574         write_reg(info, CHA + CCR0, 0x80);
3575         write_reg(info, CHB + CCR0, 0x80);
3576         write_reg(info, CHA + MODE, 0);
3577         write_reg(info, CHB + MODE, 0);
3578
3579         /* disable all interrupts */
3580         irq_disable(info, CHA, 0xffff);
3581         irq_disable(info, CHB, 0xffff);
3582         port_irq_disable(info, 0xff);
3583
3584         /* PCR Port Configuration Register
3585          *
3586          * 07..04  DEC[3..0] Serial I/F select outputs
3587          * 03      output, 1=AUTO CTS control enabled
3588          * 02      RI Ring Indicator input 0=active
3589          * 01      DSR input 0=active
3590          * 00      DTR output 0=active
3591          *
3592          * 0000 0110
3593          */
3594         write_reg(info, PCR, 0x06);
3595
3596         /* PVR Port Value Register
3597          *
3598          * 07..04  DEC[3..0] Serial I/F select (0000=disabled)
3599          * 03      AUTO CTS output 1=enabled
3600          * 02      RI Ring Indicator input
3601          * 01      DSR input
3602          * 00      DTR output (1=inactive)
3603          *
3604          * 0000 0001
3605          */
3606 //      write_reg(info, PVR, PVR_DTR);
3607
3608         /* IPC Interrupt Port Configuration
3609          *
3610          * 07      VIS 1=Masked interrupts visible
3611          * 06..05  Reserved, 0
3612          * 04..03  SLA Slave address, 00 ignored
3613          * 02      CASM Cascading Mode, 1=daisy chain
3614          * 01..00  IC[1..0] Interrupt Config, 01=push-pull output, active low
3615          *
3616          * 0000 0101
3617          */
3618         write_reg(info, IPC, 0x05);
3619 }
3620
3621 static void async_mode(MGSLPC_INFO *info)
3622 {
3623         unsigned char val;
3624
3625         /* disable all interrupts */
3626         irq_disable(info, CHA, 0xffff);
3627         irq_disable(info, CHB, 0xffff);
3628         port_irq_disable(info, 0xff);
3629
3630         /* MODE
3631          *
3632          * 07      Reserved, 0
3633          * 06      FRTS RTS State, 0=active
3634          * 05      FCTS Flow Control on CTS
3635          * 04      FLON Flow Control Enable
3636          * 03      RAC Receiver Active, 0 = inactive
3637          * 02      RTS 0=Auto RTS, 1=manual RTS
3638          * 01      TRS Timer Resolution, 1=512
3639          * 00      TLP Test Loop, 0 = no loop
3640          *
3641          * 0000 0110
3642          */
3643         val = 0x06;
3644         if (info->params.loopback)
3645                 val |= BIT0;
3646
3647         /* preserve RTS state */
3648         if (!(info->serial_signals & SerialSignal_RTS))
3649                 val |= BIT6;
3650         write_reg(info, CHA + MODE, val);
3651
3652         /* CCR0
3653          *
3654          * 07      PU Power Up, 1=active, 0=power down
3655          * 06      MCE Master Clock Enable, 1=enabled
3656          * 05      Reserved, 0
3657          * 04..02  SC[2..0] Encoding, 000=NRZ
3658          * 01..00  SM[1..0] Serial Mode, 11=Async
3659          *
3660          * 1000 0011
3661          */
3662         write_reg(info, CHA + CCR0, 0x83);
3663
3664         /* CCR1
3665          *
3666          * 07..05  Reserved, 0
3667          * 04      ODS Output Driver Select, 1=TxD is push-pull output
3668          * 03      BCR Bit Clock Rate, 1=16x
3669          * 02..00  CM[2..0] Clock Mode, 111=BRG
3670          *
3671          * 0001 1111
3672          */
3673         write_reg(info, CHA + CCR1, 0x1f);
3674
3675         /* CCR2 (channel A)
3676          *
3677          * 07..06  BGR[9..8] Baud rate bits 9..8
3678          * 05      BDF Baud rate divisor factor, 0=1, 1=BGR value
3679          * 04      SSEL Clock source select, 1=submode b
3680          * 03      TOE 0=TxCLK is input, 0=TxCLK is input
3681          * 02      RWX Read/Write Exchange 0=disabled
3682          * 01      Reserved, 0
3683          * 00      DIV, data inversion 0=disabled, 1=enabled
3684          *
3685          * 0001 0000
3686          */
3687         write_reg(info, CHA + CCR2, 0x10);
3688
3689         /* CCR3
3690          *
3691          * 07..01  Reserved, 0
3692          * 00      PSD DPLL Phase Shift Disable
3693          *
3694          * 0000 0000
3695          */
3696         write_reg(info, CHA + CCR3, 0);
3697
3698         /* CCR4
3699          *
3700          * 07      MCK4 Master Clock Divide by 4, 1=enabled
3701          * 06      EBRG Enhanced Baud Rate Generator Mode, 1=enabled
3702          * 05      TST1 Test Pin, 0=normal operation
3703          * 04      ICD Ivert Carrier Detect, 1=enabled (active low)
3704          * 03..00  Reserved, must be 0
3705          *
3706          * 0101 0000
3707          */
3708         write_reg(info, CHA + CCR4, 0x50);
3709         mgslpc_set_rate(info, CHA, info->params.data_rate * 16);
3710
3711         /* DAFO Data Format
3712          *
3713          * 07      Reserved, 0
3714          * 06      XBRK transmit break, 0=normal operation
3715          * 05      Stop bits (0=1, 1=2)
3716          * 04..03  PAR[1..0] Parity (01=odd, 10=even)
3717          * 02      PAREN Parity Enable
3718          * 01..00  CHL[1..0] Character Length (00=8, 01=7)
3719          *
3720          */
3721         val = 0x00;
3722         if (info->params.data_bits != 8)
3723                 val |= BIT0;    /* 7 bits */
3724         if (info->params.stop_bits != 1)
3725                 val |= BIT5;
3726         if (info->params.parity != ASYNC_PARITY_NONE)
3727         {
3728                 val |= BIT2;    /* Parity enable */
3729                 if (info->params.parity == ASYNC_PARITY_ODD)
3730                         val |= BIT3;
3731                 else
3732                         val |= BIT4;
3733         }
3734         write_reg(info, CHA + DAFO, val);
3735
3736         /* RFC Rx FIFO Control
3737          *
3738          * 07      Reserved, 0
3739          * 06      DPS, 1=parity bit not stored in data byte
3740          * 05      DXS, 0=all data stored in FIFO (including XON/XOFF)
3741          * 04      RFDF Rx FIFO Data Format, 1=status byte stored in FIFO
3742          * 03..02  RFTH[1..0], rx threshold, 11=16 status + 16 data byte
3743          * 01      Reserved, 0
3744          * 00      TCDE Terminate Char Detect Enable, 0=disabled
3745          *
3746          * 0101 1100
3747          */
3748         write_reg(info, CHA + RFC, 0x5c);
3749
3750         /* RLCR Receive length check register
3751          *
3752          * Max frame length = (RL + 1) * 32
3753          */
3754         write_reg(info, CHA + RLCR, 0);
3755
3756         /* XBCH Transmit Byte Count High
3757          *
3758          * 07      DMA mode, 0 = interrupt driven
3759          * 06      NRM, 0=ABM (ignored)
3760          * 05      CAS Carrier Auto Start
3761          * 04      XC Transmit Continuously (ignored)
3762          * 03..00  XBC[10..8] Transmit byte count bits 10..8
3763          *
3764          * 0000 0000
3765          */
3766         val = 0x00;
3767         if (info->params.flags & HDLC_FLAG_AUTO_DCD)
3768                 val |= BIT5;
3769         write_reg(info, CHA + XBCH, val);
3770         if (info->params.flags & HDLC_FLAG_AUTO_CTS)
3771                 irq_enable(info, CHA, IRQ_CTS);
3772
3773         /* MODE:03 RAC Receiver Active, 1=active */
3774         set_reg_bits(info, CHA + MODE, BIT3);
3775         enable_auxclk(info);
3776         if (info->params.flags & HDLC_FLAG_AUTO_CTS) {
3777                 irq_enable(info, CHB, IRQ_CTS);
3778                 /* PVR[3] 1=AUTO CTS active */
3779                 set_reg_bits(info, CHA + PVR, BIT3);
3780         } else
3781                 clear_reg_bits(info, CHA + PVR, BIT3);
3782         irq_enable(info, CHA,
3783                           IRQ_RXEOM + IRQ_RXFIFO + IRQ_BREAK_ON + IRQ_RXTIME +
3784                           IRQ_ALLSENT + IRQ_TXFIFO);
3785         issue_command(info, CHA, CMD_TXRESET + CMD_RXRESET);
3786         wait_command_complete(info, CHA);
3787         read_reg16(info, CHA + ISR);    /* clear pending IRQs */
3788 }
3789
3790 /* Set the HDLC idle mode for the transmitter.
3791  */
3792 static void tx_set_idle(MGSLPC_INFO *info)
3793 {
3794         /* Note: ESCC2 only supports flags and one idle modes */
3795         if (info->idle_mode == HDLC_TXIDLE_FLAGS)
3796                 set_reg_bits(info, CHA + CCR1, BIT3);
3797         else
3798                 clear_reg_bits(info, CHA + CCR1, BIT3);
3799 }
3800
3801 /* get state of the V24 status (input) signals.
3802  */
3803 static void get_signals(MGSLPC_INFO *info)
3804 {
3805         unsigned char status = 0;
3806
3807         /* preserve DTR and RTS */
3808         info->serial_signals &= SerialSignal_DTR + SerialSignal_RTS;
3809
3810         if (read_reg(info, CHB + VSTR) & BIT7)
3811                 info->serial_signals |= SerialSignal_DCD;
3812         if (read_reg(info, CHB + STAR) & BIT1)
3813                 info->serial_signals |= SerialSignal_CTS;
3814
3815         status = read_reg(info, CHA + PVR);
3816         if (!(status & PVR_RI))
3817                 info->serial_signals |= SerialSignal_RI;
3818         if (!(status & PVR_DSR))
3819                 info->serial_signals |= SerialSignal_DSR;
3820 }
3821
3822 /* Set the state of DTR and RTS based on contents of
3823  * serial_signals member of device extension.
3824  */
3825 static void set_signals(MGSLPC_INFO *info)
3826 {
3827         unsigned char val;
3828
3829         val = read_reg(info, CHA + MODE);
3830         if (info->params.mode == MGSL_MODE_ASYNC) {
3831                 if (info->serial_signals & SerialSignal_RTS)
3832                         val &= ~BIT6;
3833                 else
3834                         val |= BIT6;
3835         } else {
3836                 if (info->serial_signals & SerialSignal_RTS)
3837                         val |= BIT2;
3838                 else
3839                         val &= ~BIT2;
3840         }
3841         write_reg(info, CHA + MODE, val);
3842
3843         if (info->serial_signals & SerialSignal_DTR)
3844                 clear_reg_bits(info, CHA + PVR, PVR_DTR);
3845         else
3846                 set_reg_bits(info, CHA + PVR, PVR_DTR);
3847 }
3848
3849 static void rx_reset_buffers(MGSLPC_INFO *info)
3850 {
3851         RXBUF *buf;
3852         int i;
3853
3854         info->rx_put = 0;
3855         info->rx_get = 0;
3856         info->rx_frame_count = 0;
3857         for (i=0 ; i < info->rx_buf_count ; i++) {
3858                 buf = (RXBUF*)(info->rx_buf + (i * info->rx_buf_size));
3859                 buf->status = buf->count = 0;
3860         }
3861 }
3862
3863 /* Attempt to return a received HDLC frame
3864  * Only frames received without errors are returned.
3865  *
3866  * Returns 1 if frame returned, otherwise 0
3867  */
3868 static int rx_get_frame(MGSLPC_INFO *info)
3869 {
3870         unsigned short status;
3871         RXBUF *buf;
3872         unsigned int framesize = 0;
3873         unsigned long flags;
3874         struct tty_struct *tty = info->tty;
3875         int return_frame = 0;
3876
3877         if (info->rx_frame_count == 0)
3878                 return 0;
3879
3880         buf = (RXBUF*)(info->rx_buf + (info->rx_get * info->rx_buf_size));
3881
3882         status = buf->status;
3883
3884         /* 07  VFR  1=valid frame
3885          * 06  RDO  1=data overrun
3886          * 05  CRC  1=OK, 0=error
3887          * 04  RAB  1=frame aborted
3888          */
3889         if ((status & 0xf0) != 0xA0) {
3890                 if (!(status & BIT7) || (status & BIT4))
3891                         info->icount.rxabort++;
3892                 else if (status & BIT6)
3893                         info->icount.rxover++;
3894                 else if (!(status & BIT5)) {
3895                         info->icount.rxcrc++;
3896                         if (info->params.crc_type & HDLC_CRC_RETURN_EX)
3897                                 return_frame = 1;
3898                 }
3899                 framesize = 0;
3900 #if SYNCLINK_GENERIC_HDLC
3901                 {
3902                         struct net_device_stats *stats = hdlc_stats(info->netdev);
3903                         stats->rx_errors++;
3904                         stats->rx_frame_errors++;
3905                 }
3906 #endif
3907         } else
3908                 return_frame = 1;
3909
3910         if (return_frame)
3911                 framesize = buf->count;
3912
3913         if (debug_level >= DEBUG_LEVEL_BH)
3914                 printk("%s(%d):rx_get_frame(%s) status=%04X size=%d\n",
3915                         __FILE__,__LINE__,info->device_name,status,framesize);
3916
3917         if (debug_level >= DEBUG_LEVEL_DATA)
3918                 trace_block(info, buf->data, framesize, 0);
3919
3920         if (framesize) {
3921                 if ((info->params.crc_type & HDLC_CRC_RETURN_EX &&
3922                       framesize+1 > info->max_frame_size) ||
3923                     framesize > info->max_frame_size)
3924                         info->icount.rxlong++;
3925                 else {
3926                         if (status & BIT5)
3927                                 info->icount.rxok++;
3928
3929                         if (info->params.crc_type & HDLC_CRC_RETURN_EX) {
3930                                 *(buf->data + framesize) = status & BIT5 ? RX_OK:RX_CRC_ERROR;
3931                                 ++framesize;
3932                         }
3933
3934 #if SYNCLINK_GENERIC_HDLC
3935                         if (info->netcount)
3936                                 hdlcdev_rx(info, buf->data, framesize);
3937                         else
3938 #endif
3939                                 ldisc_receive_buf(tty, buf->data, info->flag_buf, framesize);
3940                 }
3941         }
3942
3943         spin_lock_irqsave(&info->lock,flags);
3944         buf->status = buf->count = 0;
3945         info->rx_frame_count--;
3946         info->rx_get++;
3947         if (info->rx_get >= info->rx_buf_count)
3948                 info->rx_get = 0;
3949         spin_unlock_irqrestore(&info->lock,flags);
3950
3951         return 1;
3952 }
3953
3954 static BOOLEAN register_test(MGSLPC_INFO *info)
3955 {
3956         static unsigned char patterns[] =
3957             { 0x00, 0xff, 0xaa, 0x55, 0x69, 0x96, 0x0f };
3958         static unsigned int count = ARRAY_SIZE(patterns);
3959         unsigned int i;
3960         BOOLEAN rc = TRUE;
3961         unsigned long flags;
3962
3963         spin_lock_irqsave(&info->lock,flags);
3964         reset_device(info);
3965
3966         for (i = 0; i < count; i++) {
3967                 write_reg(info, XAD1, patterns[i]);
3968                 write_reg(info, XAD2, patterns[(i + 1) % count]);
3969                 if ((read_reg(info, XAD1) != patterns[i]) ||
3970                     (read_reg(info, XAD2) != patterns[(i + 1) % count])) {
3971                         rc = FALSE;
3972                         break;
3973                 }
3974         }
3975
3976         spin_unlock_irqrestore(&info->lock,flags);
3977         return rc;
3978 }
3979
3980 static BOOLEAN irq_test(MGSLPC_INFO *info)
3981 {
3982         unsigned long end_time;
3983         unsigned long flags;
3984
3985         spin_lock_irqsave(&info->lock,flags);
3986         reset_device(info);
3987
3988         info->testing_irq = TRUE;
3989         hdlc_mode(info);
3990
3991         info->irq_occurred = FALSE;
3992
3993         /* init hdlc mode */
3994
3995         irq_enable(info, CHA, IRQ_TIMER);
3996         write_reg(info, CHA + TIMR, 0); /* 512 cycles */
3997         issue_command(info, CHA, CMD_START_TIMER);
3998
3999         spin_unlock_irqrestore(&info->lock,flags);
4000
4001         end_time=100;
4002         while(end_time-- && !info->irq_occurred) {
4003                 msleep_interruptible(10);
4004         }
4005
4006         info->testing_irq = FALSE;
4007
4008         spin_lock_irqsave(&info->lock,flags);
4009         reset_device(info);
4010         spin_unlock_irqrestore(&info->lock,flags);
4011
4012         return info->irq_occurred ? TRUE : FALSE;
4013 }
4014
4015 static int adapter_test(MGSLPC_INFO *info)
4016 {
4017         if (!register_test(info)) {
4018                 info->init_error = DiagStatus_AddressFailure;
4019                 printk( "%s(%d):Register test failure for device %s Addr=%04X\n",
4020                         __FILE__,__LINE__,info->device_name, (unsigned short)(info->io_base) );
4021                 return -ENODEV;
4022         }
4023
4024         if (!irq_test(info)) {
4025                 info->init_error = DiagStatus_IrqFailure;
4026                 printk( "%s(%d):Interrupt test failure for device %s IRQ=%d\n",
4027                         __FILE__,__LINE__,info->device_name, (unsigned short)(info->irq_level) );
4028                 return -ENODEV;
4029         }
4030
4031         if (debug_level >= DEBUG_LEVEL_INFO)
4032                 printk("%s(%d):device %s passed diagnostics\n",
4033                         __FILE__,__LINE__,info->device_name);
4034         return 0;
4035 }
4036
4037 static void trace_block(MGSLPC_INFO *info,const char* data, int count, int xmit)
4038 {
4039         int i;
4040         int linecount;
4041         if (xmit)
4042                 printk("%s tx data:\n",info->device_name);
4043         else
4044                 printk("%s rx data:\n",info->device_name);
4045
4046         while(count) {
4047                 if (count > 16)
4048                         linecount = 16;
4049                 else
4050                         linecount = count;
4051
4052                 for(i=0;i<linecount;i++)
4053                         printk("%02X ",(unsigned char)data[i]);
4054                 for(;i<17;i++)
4055                         printk("   ");
4056                 for(i=0;i<linecount;i++) {
4057                         if (data[i]>=040 && data[i]<=0176)
4058                                 printk("%c",data[i]);
4059                         else
4060                                 printk(".");
4061                 }
4062                 printk("\n");
4063
4064                 data  += linecount;
4065                 count -= linecount;
4066         }
4067 }
4068
4069 /* HDLC frame time out
4070  * update stats and do tx completion processing
4071  */
4072 static void tx_timeout(unsigned long context)
4073 {
4074         MGSLPC_INFO *info = (MGSLPC_INFO*)context;
4075         unsigned long flags;
4076
4077         if ( debug_level >= DEBUG_LEVEL_INFO )
4078                 printk( "%s(%d):tx_timeout(%s)\n",
4079                         __FILE__,__LINE__,info->device_name);
4080         if(info->tx_active &&
4081            info->params.mode == MGSL_MODE_HDLC) {
4082                 info->icount.txtimeout++;
4083         }
4084         spin_lock_irqsave(&info->lock,flags);
4085         info->tx_active = 0;
4086         info->tx_count = info->tx_put = info->tx_get = 0;
4087
4088         spin_unlock_irqrestore(&info->lock,flags);
4089
4090 #if SYNCLINK_GENERIC_HDLC
4091         if (info->netcount)
4092                 hdlcdev_tx_done(info);
4093         else
4094 #endif
4095                 bh_transmit(info);
4096 }
4097
4098 #if SYNCLINK_GENERIC_HDLC
4099
4100 /**
4101  * called by generic HDLC layer when protocol selected (PPP, frame relay, etc.)
4102  * set encoding and frame check sequence (FCS) options
4103  *
4104  * dev       pointer to network device structure
4105  * encoding  serial encoding setting
4106  * parity    FCS setting
4107  *
4108  * returns 0 if success, otherwise error code
4109  */
4110 static int hdlcdev_attach(struct net_device *dev, unsigned short encoding,
4111                           unsigned short parity)
4112 {
4113         MGSLPC_INFO *info = dev_to_port(dev);
4114         unsigned char  new_encoding;
4115         unsigned short new_crctype;
4116
4117         /* return error if TTY interface open */
4118         if (info->count)
4119                 return -EBUSY;
4120
4121         switch (encoding)
4122         {
4123         case ENCODING_NRZ:        new_encoding = HDLC_ENCODING_NRZ; break;
4124         case ENCODING_NRZI:       new_encoding = HDLC_ENCODING_NRZI_SPACE; break;
4125         case ENCODING_FM_MARK:    new_encoding = HDLC_ENCODING_BIPHASE_MARK; break;
4126         case ENCODING_FM_SPACE:   new_encoding = HDLC_ENCODING_BIPHASE_SPACE; break;
4127         case ENCODING_MANCHESTER: new_encoding = HDLC_ENCODING_BIPHASE_LEVEL; break;
4128         default: return -EINVAL;
4129         }
4130
4131         switch (parity)
4132         {
4133         case PARITY_NONE:            new_crctype = HDLC_CRC_NONE; break;
4134         case PARITY_CRC16_PR1_CCITT: new_crctype = HDLC_CRC_16_CCITT; break;
4135         case PARITY_CRC32_PR1_CCITT: new_crctype = HDLC_CRC_32_CCITT; break;
4136         default: return -EINVAL;
4137         }
4138
4139         info->params.encoding = new_encoding;
4140         info->params.crc_type = new_crctype;
4141
4142         /* if network interface up, reprogram hardware */
4143         if (info->netcount)
4144                 mgslpc_program_hw(info);
4145
4146         return 0;
4147 }
4148
4149 /**
4150  * called by generic HDLC layer to send frame
4151  *
4152  * skb  socket buffer containing HDLC frame
4153  * dev  pointer to network device structure
4154  *
4155  * returns 0 if success, otherwise error code
4156  */
4157 static int hdlcdev_xmit(struct sk_buff *skb, struct net_device *dev)
4158 {
4159         MGSLPC_INFO *info = dev_to_port(dev);
4160         struct net_device_stats *stats = hdlc_stats(dev);
4161         unsigned long flags;
4162
4163         if (debug_level >= DEBUG_LEVEL_INFO)
4164                 printk(KERN_INFO "%s:hdlc_xmit(%s)\n",__FILE__,dev->name);
4165
4166         /* stop sending until this frame completes */
4167         netif_stop_queue(dev);
4168
4169         /* copy data to device buffers */
4170         skb_copy_from_linear_data(skb, info->tx_buf, skb->len);
4171         info->tx_get = 0;
4172         info->tx_put = info->tx_count = skb->len;
4173
4174         /* update network statistics */
4175         stats->tx_packets++;
4176         stats->tx_bytes += skb->len;
4177
4178         /* done with socket buffer, so free it */
4179         dev_kfree_skb(skb);
4180
4181         /* save start time for transmit timeout detection */
4182         dev->trans_start = jiffies;
4183
4184         /* start hardware transmitter if necessary */
4185         spin_lock_irqsave(&info->lock,flags);
4186         if (!info->tx_active)
4187                 tx_start(info);
4188         spin_unlock_irqrestore(&info->lock,flags);
4189
4190         return 0;
4191 }
4192
4193 /**
4194  * called by network layer when interface enabled
4195  * claim resources and initialize hardware
4196  *
4197  * dev  pointer to network device structure
4198  *
4199  * returns 0 if success, otherwise error code
4200  */
4201 static int hdlcdev_open(struct net_device *dev)
4202 {
4203         MGSLPC_INFO *info = dev_to_port(dev);
4204         int rc;
4205         unsigned long flags;
4206
4207         if (debug_level >= DEBUG_LEVEL_INFO)
4208                 printk("%s:hdlcdev_open(%s)\n",__FILE__,dev->name);
4209
4210         /* generic HDLC layer open processing */
4211         if ((rc = hdlc_open(dev)))
4212                 return rc;
4213
4214         /* arbitrate between network and tty opens */
4215         spin_lock_irqsave(&info->netlock, flags);
4216         if (info->count != 0 || info->netcount != 0) {
4217                 printk(KERN_WARNING "%s: hdlc_open returning busy\n", dev->name);
4218                 spin_unlock_irqrestore(&info->netlock, flags);
4219                 return -EBUSY;
4220         }
4221         info->netcount=1;
4222         spin_unlock_irqrestore(&info->netlock, flags);
4223
4224         /* claim resources and init adapter */
4225         if ((rc = startup(info)) != 0) {
4226                 spin_lock_irqsave(&info->netlock, flags);
4227                 info->netcount=0;
4228                 spin_unlock_irqrestore(&info->netlock, flags);
4229                 return rc;
4230         }
4231
4232         /* assert DTR and RTS, apply hardware settings */
4233         info->serial_signals |= SerialSignal_RTS + SerialSignal_DTR;
4234         mgslpc_program_hw(info);
4235
4236         /* enable network layer transmit */
4237         dev->trans_start = jiffies;
4238         netif_start_queue(dev);
4239
4240         /* inform generic HDLC layer of current DCD status */
4241         spin_lock_irqsave(&info->lock, flags);
4242         get_signals(info);
4243         spin_unlock_irqrestore(&info->lock, flags);
4244         if (info->serial_signals & SerialSignal_DCD)
4245                 netif_carrier_on(dev);
4246         else
4247                 netif_carrier_off(dev);
4248         return 0;
4249 }
4250
4251 /**
4252  * called by network layer when interface is disabled
4253  * shutdown hardware and release resources
4254  *
4255  * dev  pointer to network device structure
4256  *
4257  * returns 0 if success, otherwise error code
4258  */
4259 static int hdlcdev_close(struct net_device *dev)
4260 {
4261         MGSLPC_INFO *info = dev_to_port(dev);
4262         unsigned long flags;
4263
4264         if (debug_level >= DEBUG_LEVEL_INFO)
4265                 printk("%s:hdlcdev_close(%s)\n",__FILE__,dev->name);
4266
4267         netif_stop_queue(dev);
4268
4269         /* shutdown adapter and release resources */
4270         shutdown(info);
4271
4272         hdlc_close(dev);
4273
4274         spin_lock_irqsave(&info->netlock, flags);
4275         info->netcount=0;
4276         spin_unlock_irqrestore(&info->netlock, flags);
4277
4278         return 0;
4279 }
4280
4281 /**
4282  * called by network layer to process IOCTL call to network device
4283  *
4284  * dev  pointer to network device structure
4285  * ifr  pointer to network interface request structure
4286  * cmd  IOCTL command code
4287  *
4288  * returns 0 if success, otherwise error code
4289  */
4290 static int hdlcdev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
4291 {
4292         const size_t size = sizeof(sync_serial_settings);
4293         sync_serial_settings new_line;
4294         sync_serial_settings __user *line = ifr->ifr_settings.ifs_ifsu.sync;
4295         MGSLPC_INFO *info = dev_to_port(dev);
4296         unsigned int flags;
4297
4298         if (debug_level >= DEBUG_LEVEL_INFO)
4299                 printk("%s:hdlcdev_ioctl(%s)\n",__FILE__,dev->name);
4300
4301         /* return error if TTY interface open */
4302         if (info->count)
4303                 return -EBUSY;
4304
4305         if (cmd != SIOCWANDEV)
4306                 return hdlc_ioctl(dev, ifr, cmd);
4307
4308         switch(ifr->ifr_settings.type) {
4309         case IF_GET_IFACE: /* return current sync_serial_settings */
4310
4311                 ifr->ifr_settings.type = IF_IFACE_SYNC_SERIAL;
4312                 if (ifr->ifr_settings.size < size) {
4313                         ifr->ifr_settings.size = size; /* data size wanted */
4314                         return -ENOBUFS;
4315                 }
4316
4317                 flags = info->params.flags & (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
4318                                               HDLC_FLAG_RXC_BRG    | HDLC_FLAG_RXC_TXCPIN |
4319                                               HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
4320                                               HDLC_FLAG_TXC_BRG    | HDLC_FLAG_TXC_RXCPIN);
4321
4322                 switch (flags){
4323                 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN): new_line.clock_type = CLOCK_EXT; break;
4324                 case (HDLC_FLAG_RXC_BRG    | HDLC_FLAG_TXC_BRG):    new_line.clock_type = CLOCK_INT; break;
4325                 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG):    new_line.clock_type = CLOCK_TXINT; break;
4326                 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN): new_line.clock_type = CLOCK_TXFROMRX; break;
4327                 default: new_line.clock_type = CLOCK_DEFAULT;
4328                 }
4329
4330                 new_line.clock_rate = info->params.clock_speed;
4331                 new_line.loopback   = info->params.loopback ? 1:0;
4332
4333                 if (copy_to_user(line, &new_line, size))
4334                         return -EFAULT;
4335                 return 0;
4336
4337         case IF_IFACE_SYNC_SERIAL: /* set sync_serial_settings */
4338
4339                 if(!capable(CAP_NET_ADMIN))
4340                         return -EPERM;
4341                 if (copy_from_user(&new_line, line, size))
4342                         return -EFAULT;
4343
4344                 switch (new_line.clock_type)
4345                 {
4346                 case CLOCK_EXT:      flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN; break;
4347                 case CLOCK_TXFROMRX: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN; break;
4348                 case CLOCK_INT:      flags = HDLC_FLAG_RXC_BRG    | HDLC_FLAG_TXC_BRG;    break;
4349                 case CLOCK_TXINT:    flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG;    break;
4350                 case CLOCK_DEFAULT:  flags = info->params.flags &
4351                                              (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
4352                                               HDLC_FLAG_RXC_BRG    | HDLC_FLAG_RXC_TXCPIN |
4353                                               HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
4354                                               HDLC_FLAG_TXC_BRG    | HDLC_FLAG_TXC_RXCPIN); break;
4355                 default: return -EINVAL;
4356                 }
4357
4358                 if (new_line.loopback != 0 && new_line.loopback != 1)
4359                         return -EINVAL;
4360
4361                 info->params.flags &= ~(HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
4362                                         HDLC_FLAG_RXC_BRG    | HDLC_FLAG_RXC_TXCPIN |
4363                                         HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
4364                                         HDLC_FLAG_TXC_BRG    | HDLC_FLAG_TXC_RXCPIN);
4365                 info->params.flags |= flags;
4366
4367                 info->params.loopback = new_line.loopback;
4368
4369                 if (flags & (HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG))
4370                         info->params.clock_speed = new_line.clock_rate;
4371                 else
4372                         info->params.clock_speed = 0;
4373
4374                 /* if network interface up, reprogram hardware */
4375                 if (info->netcount)
4376                         mgslpc_program_hw(info);
4377                 return 0;
4378
4379         default:
4380                 return hdlc_ioctl(dev, ifr, cmd);
4381         }
4382 }
4383
4384 /**
4385  * called by network layer when transmit timeout is detected
4386  *
4387  * dev  pointer to network device structure
4388  */
4389 static void hdlcdev_tx_timeout(struct net_device *dev)
4390 {
4391         MGSLPC_INFO *info = dev_to_port(dev);
4392         struct net_device_stats *stats = hdlc_stats(dev);
4393         unsigned long flags;
4394
4395         if (debug_level >= DEBUG_LEVEL_INFO)
4396                 printk("hdlcdev_tx_timeout(%s)\n",dev->name);
4397
4398         stats->tx_errors++;
4399         stats->tx_aborted_errors++;
4400
4401         spin_lock_irqsave(&info->lock,flags);
4402         tx_stop(info);
4403         spin_unlock_irqrestore(&info->lock,flags);
4404
4405         netif_wake_queue(dev);
4406 }
4407
4408 /**
4409  * called by device driver when transmit completes
4410  * reenable network layer transmit if stopped
4411  *
4412  * info  pointer to device instance information
4413  */
4414 static void hdlcdev_tx_done(MGSLPC_INFO *info)
4415 {
4416         if (netif_queue_stopped(info->netdev))
4417                 netif_wake_queue(info->netdev);
4418 }
4419
4420 /**
4421  * called by device driver when frame received
4422  * pass frame to network layer
4423  *
4424  * info  pointer to device instance information
4425  * buf   pointer to buffer contianing frame data
4426  * size  count of data bytes in buf
4427  */
4428 static void hdlcdev_rx(MGSLPC_INFO *info, char *buf, int size)
4429 {
4430         struct sk_buff *skb = dev_alloc_skb(size);
4431         struct net_device *dev = info->netdev;
4432         struct net_device_stats *stats = hdlc_stats(dev);
4433
4434         if (debug_level >= DEBUG_LEVEL_INFO)
4435                 printk("hdlcdev_rx(%s)\n",dev->name);
4436
4437         if (skb == NULL) {
4438                 printk(KERN_NOTICE "%s: can't alloc skb, dropping packet\n", dev->name);
4439                 stats->rx_dropped++;
4440                 return;
4441         }
4442
4443         memcpy(skb_put(skb, size),buf,size);
4444
4445         skb->protocol = hdlc_type_trans(skb, info->netdev);
4446
4447         stats->rx_packets++;
4448         stats->rx_bytes += size;
4449
4450         netif_rx(skb);
4451
4452         info->netdev->last_rx = jiffies;
4453 }
4454
4455 /**
4456  * called by device driver when adding device instance
4457  * do generic HDLC initialization
4458  *
4459  * info  pointer to device instance information
4460  *
4461  * returns 0 if success, otherwise error code
4462  */
4463 static int hdlcdev_init(MGSLPC_INFO *info)
4464 {
4465         int rc;
4466         struct net_device *dev;
4467         hdlc_device *hdlc;
4468
4469         /* allocate and initialize network and HDLC layer objects */
4470
4471         if (!(dev = alloc_hdlcdev(info))) {
4472                 printk(KERN_ERR "%s:hdlc device allocation failure\n",__FILE__);
4473                 return -ENOMEM;
4474         }
4475
4476         /* for network layer reporting purposes only */
4477         dev->base_addr = info->io_base;
4478         dev->irq       = info->irq_level;
4479
4480         /* network layer callbacks and settings */
4481         dev->do_ioctl       = hdlcdev_ioctl;
4482         dev->open           = hdlcdev_open;
4483         dev->stop           = hdlcdev_close;
4484         dev->tx_timeout     = hdlcdev_tx_timeout;
4485         dev->watchdog_timeo = 10*HZ;
4486         dev->tx_queue_len   = 50;
4487
4488         /* generic HDLC layer callbacks and settings */
4489         hdlc         = dev_to_hdlc(dev);
4490         hdlc->attach = hdlcdev_attach;
4491         hdlc->xmit   = hdlcdev_xmit;
4492
4493         /* register objects with HDLC layer */
4494         if ((rc = register_hdlc_device(dev))) {
4495                 printk(KERN_WARNING "%s:unable to register hdlc device\n",__FILE__);
4496                 free_netdev(dev);
4497                 return rc;
4498         }
4499
4500         info->netdev = dev;
4501         return 0;
4502 }
4503
4504 /**
4505  * called by device driver when removing device instance
4506  * do generic HDLC cleanup
4507  *
4508  * info  pointer to device instance information
4509  */
4510 static void hdlcdev_exit(MGSLPC_INFO *info)
4511 {
4512         unregister_hdlc_device(info->netdev);
4513         free_netdev(info->netdev);
4514         info->netdev = NULL;
4515 }
4516
4517 #endif /* CONFIG_HDLC */
4518