drivers/char/pcmcia/synclink_cs.c

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