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 <asm/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(unsigned long context);
 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         setup_timer(&info->tx_timer, tx_timeout, (unsigned long)info);
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 mgslpc_proc_open(struct inode *inode, struct file *file)
2620 {
2621         return single_open(file, mgslpc_proc_show, NULL);
2622 }
2623
2624 static const struct file_operations mgslpc_proc_fops = {
2625         .owner          = THIS_MODULE,
2626         .open           = mgslpc_proc_open,
2627         .read           = seq_read,
2628         .llseek         = seq_lseek,
2629         .release        = single_release,
2630 };
2631
2632 static int rx_alloc_buffers(MGSLPC_INFO *info)
2633 {
2634         /* each buffer has header and data */
2635         info->rx_buf_size = sizeof(RXBUF) + info->max_frame_size;
2636
2637         /* calculate total allocation size for 8 buffers */
2638         info->rx_buf_total_size = info->rx_buf_size * 8;
2639
2640         /* limit total allocated memory */
2641         if (info->rx_buf_total_size > 0x10000)
2642                 info->rx_buf_total_size = 0x10000;
2643
2644         /* calculate number of buffers */
2645         info->rx_buf_count = info->rx_buf_total_size / info->rx_buf_size;
2646
2647         info->rx_buf = kmalloc(info->rx_buf_total_size, GFP_KERNEL);
2648         if (info->rx_buf == NULL)
2649                 return -ENOMEM;
2650
2651         /* unused flag buffer to satisfy receive_buf calling interface */
2652         info->flag_buf = kzalloc(info->max_frame_size, GFP_KERNEL);
2653         if (!info->flag_buf) {
2654                 kfree(info->rx_buf);
2655                 info->rx_buf = NULL;
2656                 return -ENOMEM;
2657         }
2658
2659         rx_reset_buffers(info);
2660         return 0;
2661 }
2662
2663 static void rx_free_buffers(MGSLPC_INFO *info)
2664 {
2665         kfree(info->rx_buf);
2666         info->rx_buf = NULL;
2667         kfree(info->flag_buf);
2668         info->flag_buf = NULL;
2669 }
2670
2671 static int claim_resources(MGSLPC_INFO *info)
2672 {
2673         if (rx_alloc_buffers(info) < 0) {
2674                 printk("Can't allocate rx buffer %s\n", info->device_name);
2675                 release_resources(info);
2676                 return -ENODEV;
2677         }
2678         return 0;
2679 }
2680
2681 static void release_resources(MGSLPC_INFO *info)
2682 {
2683         if (debug_level >= DEBUG_LEVEL_INFO)
2684                 printk("release_resources(%s)\n", info->device_name);
2685         rx_free_buffers(info);
2686 }
2687
2688 /* Add the specified device instance data structure to the
2689  * global linked list of devices and increment the device count.
2690  *
2691  * Arguments:           info    pointer to device instance data
2692  */
2693 static int mgslpc_add_device(MGSLPC_INFO *info)
2694 {
2695         MGSLPC_INFO *current_dev = NULL;
2696         struct device *tty_dev;
2697         int ret;
2698
2699         info->next_device = NULL;
2700         info->line = mgslpc_device_count;
2701         sprintf(info->device_name,"ttySLP%d",info->line);
2702
2703         if (info->line < MAX_DEVICE_COUNT) {
2704                 if (maxframe[info->line])
2705                         info->max_frame_size = maxframe[info->line];
2706         }
2707
2708         mgslpc_device_count++;
2709
2710         if (!mgslpc_device_list)
2711                 mgslpc_device_list = info;
2712         else {
2713                 current_dev = mgslpc_device_list;
2714                 while (current_dev->next_device)
2715                         current_dev = current_dev->next_device;
2716                 current_dev->next_device = info;
2717         }
2718
2719         if (info->max_frame_size < 4096)
2720                 info->max_frame_size = 4096;
2721         else if (info->max_frame_size > 65535)
2722                 info->max_frame_size = 65535;
2723
2724         printk("SyncLink PC Card %s:IO=%04X IRQ=%d\n",
2725                 info->device_name, info->io_base, info->irq_level);
2726
2727 #if SYNCLINK_GENERIC_HDLC
2728         ret = hdlcdev_init(info);
2729         if (ret != 0)
2730                 goto failed;
2731 #endif
2732
2733         tty_dev = tty_port_register_device(&info->port, serial_driver, info->line,
2734                         &info->p_dev->dev);
2735         if (IS_ERR(tty_dev)) {
2736                 ret = PTR_ERR(tty_dev);
2737 #if SYNCLINK_GENERIC_HDLC
2738                 hdlcdev_exit(info);
2739 #endif
2740                 goto failed;
2741         }
2742
2743         return 0;
2744
2745 failed:
2746         if (current_dev)
2747                 current_dev->next_device = NULL;
2748         else
2749                 mgslpc_device_list = NULL;
2750         mgslpc_device_count--;
2751         return ret;
2752 }
2753
2754 static void mgslpc_remove_device(MGSLPC_INFO *remove_info)
2755 {
2756         MGSLPC_INFO *info = mgslpc_device_list;
2757         MGSLPC_INFO *last = NULL;
2758
2759         while(info) {
2760                 if (info == remove_info) {
2761                         if (last)
2762                                 last->next_device = info->next_device;
2763                         else
2764                                 mgslpc_device_list = info->next_device;
2765                         tty_unregister_device(serial_driver, info->line);
2766 #if SYNCLINK_GENERIC_HDLC
2767                         hdlcdev_exit(info);
2768 #endif
2769                         release_resources(info);
2770                         tty_port_destroy(&info->port);
2771                         kfree(info);
2772                         mgslpc_device_count--;
2773                         return;
2774                 }
2775                 last = info;
2776                 info = info->next_device;
2777         }
2778 }
2779
2780 static const struct pcmcia_device_id mgslpc_ids[] = {
2781         PCMCIA_DEVICE_MANF_CARD(0x02c5, 0x0050),
2782         PCMCIA_DEVICE_NULL
2783 };
2784 MODULE_DEVICE_TABLE(pcmcia, mgslpc_ids);
2785
2786 static struct pcmcia_driver mgslpc_driver = {
2787         .owner          = THIS_MODULE,
2788         .name           = "synclink_cs",
2789         .probe          = mgslpc_probe,
2790         .remove         = mgslpc_detach,
2791         .id_table       = mgslpc_ids,
2792         .suspend        = mgslpc_suspend,
2793         .resume         = mgslpc_resume,
2794 };
2795
2796 static const struct tty_operations mgslpc_ops = {
2797         .open = mgslpc_open,
2798         .close = mgslpc_close,
2799         .write = mgslpc_write,
2800         .put_char = mgslpc_put_char,
2801         .flush_chars = mgslpc_flush_chars,
2802         .write_room = mgslpc_write_room,
2803         .chars_in_buffer = mgslpc_chars_in_buffer,
2804         .flush_buffer = mgslpc_flush_buffer,
2805         .ioctl = mgslpc_ioctl,
2806         .throttle = mgslpc_throttle,
2807         .unthrottle = mgslpc_unthrottle,
2808         .send_xchar = mgslpc_send_xchar,
2809         .break_ctl = mgslpc_break,
2810         .wait_until_sent = mgslpc_wait_until_sent,
2811         .set_termios = mgslpc_set_termios,
2812         .stop = tx_pause,
2813         .start = tx_release,
2814         .hangup = mgslpc_hangup,
2815         .tiocmget = tiocmget,
2816         .tiocmset = tiocmset,
2817         .get_icount = mgslpc_get_icount,
2818         .proc_fops = &mgslpc_proc_fops,
2819 };
2820
2821 static int __init synclink_cs_init(void)
2822 {
2823         int rc;
2824
2825         if (break_on_load) {
2826                 mgslpc_get_text_ptr();
2827                 BREAKPOINT();
2828         }
2829
2830         serial_driver = tty_alloc_driver(MAX_DEVICE_COUNT,
2831                         TTY_DRIVER_REAL_RAW |
2832                         TTY_DRIVER_DYNAMIC_DEV);
2833         if (IS_ERR(serial_driver)) {
2834                 rc = PTR_ERR(serial_driver);
2835                 goto err;
2836         }
2837
2838         /* Initialize the tty_driver structure */
2839         serial_driver->driver_name = "synclink_cs";
2840         serial_driver->name = "ttySLP";
2841         serial_driver->major = ttymajor;
2842         serial_driver->minor_start = 64;
2843         serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
2844         serial_driver->subtype = SERIAL_TYPE_NORMAL;
2845         serial_driver->init_termios = tty_std_termios;
2846         serial_driver->init_termios.c_cflag =
2847         B9600 | CS8 | CREAD | HUPCL | CLOCAL;
2848         tty_set_operations(serial_driver, &mgslpc_ops);
2849
2850         rc = tty_register_driver(serial_driver);
2851         if (rc < 0) {
2852                 printk(KERN_ERR "%s(%d):Couldn't register serial driver\n",
2853                                 __FILE__, __LINE__);
2854                 goto err_put_tty;
2855         }
2856
2857         rc = pcmcia_register_driver(&mgslpc_driver);
2858         if (rc < 0)
2859                 goto err_unreg_tty;
2860
2861         printk(KERN_INFO "%s %s, tty major#%d\n", driver_name, driver_version,
2862                         serial_driver->major);
2863
2864         return 0;
2865 err_unreg_tty:
2866         tty_unregister_driver(serial_driver);
2867 err_put_tty:
2868         put_tty_driver(serial_driver);
2869 err:
2870         return rc;
2871 }
2872
2873 static void __exit synclink_cs_exit(void)
2874 {
2875         pcmcia_unregister_driver(&mgslpc_driver);
2876         tty_unregister_driver(serial_driver);
2877         put_tty_driver(serial_driver);
2878 }
2879
2880 module_init(synclink_cs_init);
2881 module_exit(synclink_cs_exit);
2882
2883 static void mgslpc_set_rate(MGSLPC_INFO *info, unsigned char channel, unsigned int rate)
2884 {
2885         unsigned int M, N;
2886         unsigned char val;
2887
2888         /* note:standard BRG mode is broken in V3.2 chip
2889          * so enhanced mode is always used
2890          */
2891
2892         if (rate) {
2893                 N = 3686400 / rate;
2894                 if (!N)
2895                         N = 1;
2896                 N >>= 1;
2897                 for (M = 1; N > 64 && M < 16; M++)
2898                         N >>= 1;
2899                 N--;
2900
2901                 /* BGR[5..0] = N
2902                  * BGR[9..6] = M
2903                  * BGR[7..0] contained in BGR register
2904                  * BGR[9..8] contained in CCR2[7..6]
2905                  * divisor = (N+1)*2^M
2906                  *
2907                  * Note: M *must* not be zero (causes asymetric duty cycle)
2908                  */
2909                 write_reg(info, (unsigned char) (channel + BGR),
2910                                   (unsigned char) ((M << 6) + N));
2911                 val = read_reg(info, (unsigned char) (channel + CCR2)) & 0x3f;
2912                 val |= ((M << 4) & 0xc0);
2913                 write_reg(info, (unsigned char) (channel + CCR2), val);
2914         }
2915 }
2916
2917 /* Enabled the AUX clock output at the specified frequency.
2918  */
2919 static void enable_auxclk(MGSLPC_INFO *info)
2920 {
2921         unsigned char val;
2922
2923         /* MODE
2924          *
2925          * 07..06  MDS[1..0] 10 = transparent HDLC mode
2926          * 05      ADM Address Mode, 0 = no addr recognition
2927          * 04      TMD Timer Mode, 0 = external
2928          * 03      RAC Receiver Active, 0 = inactive
2929          * 02      RTS 0=RTS active during xmit, 1=RTS always active
2930          * 01      TRS Timer Resolution, 1=512
2931          * 00      TLP Test Loop, 0 = no loop
2932          *
2933          * 1000 0010
2934          */
2935         val = 0x82;
2936
2937         /* channel B RTS is used to enable AUXCLK driver on SP505 */
2938         if (info->params.mode == MGSL_MODE_HDLC && info->params.clock_speed)
2939                 val |= BIT2;
2940         write_reg(info, CHB + MODE, val);
2941
2942         /* CCR0
2943          *
2944          * 07      PU Power Up, 1=active, 0=power down
2945          * 06      MCE Master Clock Enable, 1=enabled
2946          * 05      Reserved, 0
2947          * 04..02  SC[2..0] Encoding
2948          * 01..00  SM[1..0] Serial Mode, 00=HDLC
2949          *
2950          * 11000000
2951          */
2952         write_reg(info, CHB + CCR0, 0xc0);
2953
2954         /* CCR1
2955          *
2956          * 07      SFLG Shared Flag, 0 = disable shared flags
2957          * 06      GALP Go Active On Loop, 0 = not used
2958          * 05      GLP Go On Loop, 0 = not used
2959          * 04      ODS Output Driver Select, 1=TxD is push-pull output
2960          * 03      ITF Interframe Time Fill, 0=mark, 1=flag
2961          * 02..00  CM[2..0] Clock Mode
2962          *
2963          * 0001 0111
2964          */
2965         write_reg(info, CHB + CCR1, 0x17);
2966
2967         /* CCR2 (Channel B)
2968          *
2969          * 07..06  BGR[9..8] Baud rate bits 9..8
2970          * 05      BDF Baud rate divisor factor, 0=1, 1=BGR value
2971          * 04      SSEL Clock source select, 1=submode b
2972          * 03      TOE 0=TxCLK is input, 1=TxCLK is output
2973          * 02      RWX Read/Write Exchange 0=disabled
2974          * 01      C32, CRC select, 0=CRC-16, 1=CRC-32
2975          * 00      DIV, data inversion 0=disabled, 1=enabled
2976          *
2977          * 0011 1000
2978          */
2979         if (info->params.mode == MGSL_MODE_HDLC && info->params.clock_speed)
2980                 write_reg(info, CHB + CCR2, 0x38);
2981         else
2982                 write_reg(info, CHB + CCR2, 0x30);
2983
2984         /* CCR4
2985          *
2986          * 07      MCK4 Master Clock Divide by 4, 1=enabled
2987          * 06      EBRG Enhanced Baud Rate Generator Mode, 1=enabled
2988          * 05      TST1 Test Pin, 0=normal operation
2989          * 04      ICD Ivert Carrier Detect, 1=enabled (active low)
2990          * 03..02  Reserved, must be 0
2991          * 01..00  RFT[1..0] RxFIFO Threshold 00=32 bytes
2992          *
2993          * 0101 0000
2994          */
2995         write_reg(info, CHB + CCR4, 0x50);
2996
2997         /* if auxclk not enabled, set internal BRG so
2998          * CTS transitions can be detected (requires TxC)
2999          */
3000         if (info->params.mode == MGSL_MODE_HDLC && info->params.clock_speed)
3001                 mgslpc_set_rate(info, CHB, info->params.clock_speed);
3002         else
3003                 mgslpc_set_rate(info, CHB, 921600);
3004 }
3005
3006 static void loopback_enable(MGSLPC_INFO *info)
3007 {
3008         unsigned char val;
3009
3010         /* CCR1:02..00  CM[2..0] Clock Mode = 111 (clock mode 7) */
3011         val = read_reg(info, CHA + CCR1) | (BIT2 | BIT1 | BIT0);
3012         write_reg(info, CHA + CCR1, val);
3013
3014         /* CCR2:04 SSEL Clock source select, 1=submode b */
3015         val = read_reg(info, CHA + CCR2) | (BIT4 | BIT5);
3016         write_reg(info, CHA + CCR2, val);
3017
3018         /* set LinkSpeed if available, otherwise default to 2Mbps */
3019         if (info->params.clock_speed)
3020                 mgslpc_set_rate(info, CHA, info->params.clock_speed);
3021         else
3022                 mgslpc_set_rate(info, CHA, 1843200);
3023
3024         /* MODE:00 TLP Test Loop, 1=loopback enabled */
3025         val = read_reg(info, CHA + MODE) | BIT0;
3026         write_reg(info, CHA + MODE, val);
3027 }
3028
3029 static void hdlc_mode(MGSLPC_INFO *info)
3030 {
3031         unsigned char val;
3032         unsigned char clkmode, clksubmode;
3033
3034         /* disable all interrupts */
3035         irq_disable(info, CHA, 0xffff);
3036         irq_disable(info, CHB, 0xffff);
3037         port_irq_disable(info, 0xff);
3038
3039         /* assume clock mode 0a, rcv=RxC xmt=TxC */
3040         clkmode = clksubmode = 0;
3041         if (info->params.flags & HDLC_FLAG_RXC_DPLL
3042             && info->params.flags & HDLC_FLAG_TXC_DPLL) {
3043                 /* clock mode 7a, rcv = DPLL, xmt = DPLL */
3044                 clkmode = 7;
3045         } else if (info->params.flags & HDLC_FLAG_RXC_BRG
3046                  && info->params.flags & HDLC_FLAG_TXC_BRG) {
3047                 /* clock mode 7b, rcv = BRG, xmt = BRG */
3048                 clkmode = 7;
3049                 clksubmode = 1;
3050         } else if (info->params.flags & HDLC_FLAG_RXC_DPLL) {
3051                 if (info->params.flags & HDLC_FLAG_TXC_BRG) {
3052                         /* clock mode 6b, rcv = DPLL, xmt = BRG/16 */
3053                         clkmode = 6;
3054                         clksubmode = 1;
3055                 } else {
3056                         /* clock mode 6a, rcv = DPLL, xmt = TxC */
3057                         clkmode = 6;
3058                 }
3059         } else if (info->params.flags & HDLC_FLAG_TXC_BRG) {
3060                 /* clock mode 0b, rcv = RxC, xmt = BRG */
3061                 clksubmode = 1;
3062         }
3063
3064         /* MODE
3065          *
3066          * 07..06  MDS[1..0] 10 = transparent HDLC mode
3067          * 05      ADM Address Mode, 0 = no addr recognition
3068          * 04      TMD Timer Mode, 0 = external
3069          * 03      RAC Receiver Active, 0 = inactive
3070          * 02      RTS 0=RTS active during xmit, 1=RTS always active
3071          * 01      TRS Timer Resolution, 1=512
3072          * 00      TLP Test Loop, 0 = no loop
3073          *
3074          * 1000 0010
3075          */
3076         val = 0x82;
3077         if (info->params.loopback)
3078                 val |= BIT0;
3079
3080         /* preserve RTS state */
3081         if (info->serial_signals & SerialSignal_RTS)
3082                 val |= BIT2;
3083         write_reg(info, CHA + MODE, val);
3084
3085         /* CCR0
3086          *
3087          * 07      PU Power Up, 1=active, 0=power down
3088          * 06      MCE Master Clock Enable, 1=enabled
3089          * 05      Reserved, 0
3090          * 04..02  SC[2..0] Encoding
3091          * 01..00  SM[1..0] Serial Mode, 00=HDLC
3092          *
3093          * 11000000
3094          */
3095         val = 0xc0;
3096         switch (info->params.encoding)
3097         {
3098         case HDLC_ENCODING_NRZI:
3099                 val |= BIT3;
3100                 break;
3101         case HDLC_ENCODING_BIPHASE_SPACE:
3102                 val |= BIT4;
3103                 break;          // FM0
3104         case HDLC_ENCODING_BIPHASE_MARK:
3105                 val |= BIT4 | BIT2;
3106                 break;          // FM1
3107         case HDLC_ENCODING_BIPHASE_LEVEL:
3108                 val |= BIT4 | BIT3;
3109                 break;          // Manchester
3110         }
3111         write_reg(info, CHA + CCR0, val);
3112
3113         /* CCR1
3114          *
3115          * 07      SFLG Shared Flag, 0 = disable shared flags
3116          * 06      GALP Go Active On Loop, 0 = not used
3117          * 05      GLP Go On Loop, 0 = not used
3118          * 04      ODS Output Driver Select, 1=TxD is push-pull output
3119          * 03      ITF Interframe Time Fill, 0=mark, 1=flag
3120          * 02..00  CM[2..0] Clock Mode
3121          *
3122          * 0001 0000
3123          */
3124         val = 0x10 + clkmode;
3125         write_reg(info, CHA + CCR1, val);
3126
3127         /* CCR2
3128          *
3129          * 07..06  BGR[9..8] Baud rate bits 9..8
3130          * 05      BDF Baud rate divisor factor, 0=1, 1=BGR value
3131          * 04      SSEL Clock source select, 1=submode b
3132          * 03      TOE 0=TxCLK is input, 0=TxCLK is input
3133          * 02      RWX Read/Write Exchange 0=disabled
3134          * 01      C32, CRC select, 0=CRC-16, 1=CRC-32
3135          * 00      DIV, data inversion 0=disabled, 1=enabled
3136          *
3137          * 0000 0000
3138          */
3139         val = 0x00;
3140         if (clkmode == 2 || clkmode == 3 || clkmode == 6
3141             || clkmode == 7 || (clkmode == 0 && clksubmode == 1))
3142                 val |= BIT5;
3143         if (clksubmode)
3144                 val |= BIT4;
3145         if (info->params.crc_type == HDLC_CRC_32_CCITT)
3146                 val |= BIT1;
3147         if (info->params.encoding == HDLC_ENCODING_NRZB)
3148                 val |= BIT0;
3149         write_reg(info, CHA + CCR2, val);
3150
3151         /* CCR3
3152          *
3153          * 07..06  PRE[1..0] Preamble count 00=1, 01=2, 10=4, 11=8
3154          * 05      EPT Enable preamble transmission, 1=enabled
3155          * 04      RADD Receive address pushed to FIFO, 0=disabled
3156          * 03      CRL CRC Reset Level, 0=FFFF
3157          * 02      RCRC Rx CRC 0=On 1=Off
3158          * 01      TCRC Tx CRC 0=On 1=Off
3159          * 00      PSD DPLL Phase Shift Disable
3160          *
3161          * 0000 0000
3162          */
3163         val = 0x00;
3164         if (info->params.crc_type == HDLC_CRC_NONE)
3165                 val |= BIT2 | BIT1;
3166         if (info->params.preamble != HDLC_PREAMBLE_PATTERN_NONE)
3167                 val |= BIT5;
3168         switch (info->params.preamble_length)
3169         {
3170         case HDLC_PREAMBLE_LENGTH_16BITS:
3171                 val |= BIT6;
3172                 break;
3173         case HDLC_PREAMBLE_LENGTH_32BITS:
3174                 val |= BIT6;
3175                 break;
3176         case HDLC_PREAMBLE_LENGTH_64BITS:
3177                 val |= BIT7 | BIT6;
3178                 break;
3179         }
3180         write_reg(info, CHA + CCR3, val);
3181
3182         /* PRE - Preamble pattern */
3183         val = 0;
3184         switch (info->params.preamble)
3185         {
3186         case HDLC_PREAMBLE_PATTERN_FLAGS: val = 0x7e; break;
3187         case HDLC_PREAMBLE_PATTERN_10:    val = 0xaa; break;
3188         case HDLC_PREAMBLE_PATTERN_01:    val = 0x55; break;
3189         case HDLC_PREAMBLE_PATTERN_ONES:  val = 0xff; break;
3190         }
3191         write_reg(info, CHA + PRE, val);
3192
3193         /* CCR4
3194          *
3195          * 07      MCK4 Master Clock Divide by 4, 1=enabled
3196          * 06      EBRG Enhanced Baud Rate Generator Mode, 1=enabled
3197          * 05      TST1 Test Pin, 0=normal operation
3198          * 04      ICD Ivert Carrier Detect, 1=enabled (active low)
3199          * 03..02  Reserved, must be 0
3200          * 01..00  RFT[1..0] RxFIFO Threshold 00=32 bytes
3201          *
3202          * 0101 0000
3203          */
3204         val = 0x50;
3205         write_reg(info, CHA + CCR4, val);
3206         if (info->params.flags & HDLC_FLAG_RXC_DPLL)
3207                 mgslpc_set_rate(info, CHA, info->params.clock_speed * 16);
3208         else
3209                 mgslpc_set_rate(info, CHA, info->params.clock_speed);
3210
3211         /* RLCR Receive length check register
3212          *
3213          * 7     1=enable receive length check
3214          * 6..0  Max frame length = (RL + 1) * 32
3215          */
3216         write_reg(info, CHA + RLCR, 0);
3217
3218         /* XBCH Transmit Byte Count High
3219          *
3220          * 07      DMA mode, 0 = interrupt driven
3221          * 06      NRM, 0=ABM (ignored)
3222          * 05      CAS Carrier Auto Start
3223          * 04      XC Transmit Continuously (ignored)
3224          * 03..00  XBC[10..8] Transmit byte count bits 10..8
3225          *
3226          * 0000 0000
3227          */
3228         val = 0x00;
3229         if (info->params.flags & HDLC_FLAG_AUTO_DCD)
3230                 val |= BIT5;
3231         write_reg(info, CHA + XBCH, val);
3232         enable_auxclk(info);
3233         if (info->params.loopback || info->testing_irq)
3234                 loopback_enable(info);
3235         if (info->params.flags & HDLC_FLAG_AUTO_CTS)
3236         {
3237                 irq_enable(info, CHB, IRQ_CTS);
3238                 /* PVR[3] 1=AUTO CTS active */
3239                 set_reg_bits(info, CHA + PVR, BIT3);
3240         } else
3241                 clear_reg_bits(info, CHA + PVR, BIT3);
3242
3243         irq_enable(info, CHA,
3244                          IRQ_RXEOM | IRQ_RXFIFO | IRQ_ALLSENT |
3245                          IRQ_UNDERRUN | IRQ_TXFIFO);
3246         issue_command(info, CHA, CMD_TXRESET + CMD_RXRESET);
3247         wait_command_complete(info, CHA);
3248         read_reg16(info, CHA + ISR);    /* clear pending IRQs */
3249
3250         /* Master clock mode enabled above to allow reset commands
3251          * to complete even if no data clocks are present.
3252          *
3253          * Disable master clock mode for normal communications because
3254          * V3.2 of the ESCC2 has a bug that prevents the transmit all sent
3255          * IRQ when in master clock mode.
3256          *
3257          * Leave master clock mode enabled for IRQ test because the
3258          * timer IRQ used by the test can only happen in master clock mode.
3259          */
3260         if (!info->testing_irq)
3261                 clear_reg_bits(info, CHA + CCR0, BIT6);
3262
3263         tx_set_idle(info);
3264
3265         tx_stop(info);
3266         rx_stop(info);
3267 }
3268
3269 static void rx_stop(MGSLPC_INFO *info)
3270 {
3271         if (debug_level >= DEBUG_LEVEL_ISR)
3272                 printk("%s(%d):rx_stop(%s)\n",
3273                          __FILE__, __LINE__, info->device_name);
3274
3275         /* MODE:03 RAC Receiver Active, 0=inactive */
3276         clear_reg_bits(info, CHA + MODE, BIT3);
3277
3278         info->rx_enabled = false;
3279         info->rx_overflow = false;
3280 }
3281
3282 static void rx_start(MGSLPC_INFO *info)
3283 {
3284         if (debug_level >= DEBUG_LEVEL_ISR)
3285                 printk("%s(%d):rx_start(%s)\n",
3286                          __FILE__, __LINE__, info->device_name);
3287
3288         rx_reset_buffers(info);
3289         info->rx_enabled = false;
3290         info->rx_overflow = false;
3291
3292         /* MODE:03 RAC Receiver Active, 1=active */
3293         set_reg_bits(info, CHA + MODE, BIT3);
3294
3295         info->rx_enabled = true;
3296 }
3297
3298 static void tx_start(MGSLPC_INFO *info, struct tty_struct *tty)
3299 {
3300         if (debug_level >= DEBUG_LEVEL_ISR)
3301                 printk("%s(%d):tx_start(%s)\n",
3302                          __FILE__, __LINE__, info->device_name);
3303
3304         if (info->tx_count) {
3305                 /* If auto RTS enabled and RTS is inactive, then assert */
3306                 /* RTS and set a flag indicating that the driver should */
3307                 /* negate RTS when the transmission completes. */
3308                 info->drop_rts_on_tx_done = false;
3309
3310                 if (info->params.flags & HDLC_FLAG_AUTO_RTS) {
3311                         get_signals(info);
3312                         if (!(info->serial_signals & SerialSignal_RTS)) {
3313                                 info->serial_signals |= SerialSignal_RTS;
3314                                 set_signals(info);
3315                                 info->drop_rts_on_tx_done = true;
3316                         }
3317                 }
3318
3319                 if (info->params.mode == MGSL_MODE_ASYNC) {
3320                         if (!info->tx_active) {
3321                                 info->tx_active = true;
3322                                 tx_ready(info, tty);
3323                         }
3324                 } else {
3325                         info->tx_active = true;
3326                         tx_ready(info, tty);
3327                         mod_timer(&info->tx_timer, jiffies +
3328                                         msecs_to_jiffies(5000));
3329                 }
3330         }
3331
3332         if (!info->tx_enabled)
3333                 info->tx_enabled = true;
3334 }
3335
3336 static void tx_stop(MGSLPC_INFO *info)
3337 {
3338         if (debug_level >= DEBUG_LEVEL_ISR)
3339                 printk("%s(%d):tx_stop(%s)\n",
3340                          __FILE__, __LINE__, info->device_name);
3341
3342         del_timer(&info->tx_timer);
3343
3344         info->tx_enabled = false;
3345         info->tx_active = false;
3346 }
3347
3348 /* Reset the adapter to a known state and prepare it for further use.
3349  */
3350 static void reset_device(MGSLPC_INFO *info)
3351 {
3352         /* power up both channels (set BIT7) */
3353         write_reg(info, CHA + CCR0, 0x80);
3354         write_reg(info, CHB + CCR0, 0x80);
3355         write_reg(info, CHA + MODE, 0);
3356         write_reg(info, CHB + MODE, 0);
3357
3358         /* disable all interrupts */
3359         irq_disable(info, CHA, 0xffff);
3360         irq_disable(info, CHB, 0xffff);
3361         port_irq_disable(info, 0xff);
3362
3363         /* PCR Port Configuration Register
3364          *
3365          * 07..04  DEC[3..0] Serial I/F select outputs
3366          * 03      output, 1=AUTO CTS control enabled
3367          * 02      RI Ring Indicator input 0=active
3368          * 01      DSR input 0=active
3369          * 00      DTR output 0=active
3370          *
3371          * 0000 0110
3372          */
3373         write_reg(info, PCR, 0x06);
3374
3375         /* PVR Port Value Register
3376          *
3377          * 07..04  DEC[3..0] Serial I/F select (0000=disabled)
3378          * 03      AUTO CTS output 1=enabled
3379          * 02      RI Ring Indicator input
3380          * 01      DSR input
3381          * 00      DTR output (1=inactive)
3382          *
3383          * 0000 0001
3384          */
3385 //      write_reg(info, PVR, PVR_DTR);
3386
3387         /* IPC Interrupt Port Configuration
3388          *
3389          * 07      VIS 1=Masked interrupts visible
3390          * 06..05  Reserved, 0
3391          * 04..03  SLA Slave address, 00 ignored
3392          * 02      CASM Cascading Mode, 1=daisy chain
3393          * 01..00  IC[1..0] Interrupt Config, 01=push-pull output, active low
3394          *
3395          * 0000 0101
3396          */
3397         write_reg(info, IPC, 0x05);
3398 }
3399
3400 static void async_mode(MGSLPC_INFO *info)
3401 {
3402         unsigned char val;
3403
3404         /* disable all interrupts */
3405         irq_disable(info, CHA, 0xffff);
3406         irq_disable(info, CHB, 0xffff);
3407         port_irq_disable(info, 0xff);
3408
3409         /* MODE
3410          *
3411          * 07      Reserved, 0
3412          * 06      FRTS RTS State, 0=active
3413          * 05      FCTS Flow Control on CTS
3414          * 04      FLON Flow Control Enable
3415          * 03      RAC Receiver Active, 0 = inactive
3416          * 02      RTS 0=Auto RTS, 1=manual RTS
3417          * 01      TRS Timer Resolution, 1=512
3418          * 00      TLP Test Loop, 0 = no loop
3419          *
3420          * 0000 0110
3421          */
3422         val = 0x06;
3423         if (info->params.loopback)
3424                 val |= BIT0;
3425
3426         /* preserve RTS state */
3427         if (!(info->serial_signals & SerialSignal_RTS))
3428                 val |= BIT6;
3429         write_reg(info, CHA + MODE, val);
3430
3431         /* CCR0
3432          *
3433          * 07      PU Power Up, 1=active, 0=power down
3434          * 06      MCE Master Clock Enable, 1=enabled
3435          * 05      Reserved, 0
3436          * 04..02  SC[2..0] Encoding, 000=NRZ
3437          * 01..00  SM[1..0] Serial Mode, 11=Async
3438          *
3439          * 1000 0011
3440          */
3441         write_reg(info, CHA + CCR0, 0x83);
3442
3443         /* CCR1
3444          *
3445          * 07..05  Reserved, 0
3446          * 04      ODS Output Driver Select, 1=TxD is push-pull output
3447          * 03      BCR Bit Clock Rate, 1=16x
3448          * 02..00  CM[2..0] Clock Mode, 111=BRG
3449          *
3450          * 0001 1111
3451          */
3452         write_reg(info, CHA + CCR1, 0x1f);
3453
3454         /* CCR2 (channel A)
3455          *
3456          * 07..06  BGR[9..8] Baud rate bits 9..8
3457          * 05      BDF Baud rate divisor factor, 0=1, 1=BGR value
3458          * 04      SSEL Clock source select, 1=submode b
3459          * 03      TOE 0=TxCLK is input, 0=TxCLK is input
3460          * 02      RWX Read/Write Exchange 0=disabled
3461          * 01      Reserved, 0
3462          * 00      DIV, data inversion 0=disabled, 1=enabled
3463          *
3464          * 0001 0000
3465          */
3466         write_reg(info, CHA + CCR2, 0x10);
3467
3468         /* CCR3
3469          *
3470          * 07..01  Reserved, 0
3471          * 00      PSD DPLL Phase Shift Disable
3472          *
3473          * 0000 0000
3474          */
3475         write_reg(info, CHA + CCR3, 0);
3476
3477         /* CCR4
3478          *
3479          * 07      MCK4 Master Clock Divide by 4, 1=enabled
3480          * 06      EBRG Enhanced Baud Rate Generator Mode, 1=enabled
3481          * 05      TST1 Test Pin, 0=normal operation
3482          * 04      ICD Ivert Carrier Detect, 1=enabled (active low)
3483          * 03..00  Reserved, must be 0
3484          *
3485          * 0101 0000
3486          */
3487         write_reg(info, CHA + CCR4, 0x50);
3488         mgslpc_set_rate(info, CHA, info->params.data_rate * 16);
3489
3490         /* DAFO Data Format
3491          *
3492          * 07      Reserved, 0
3493          * 06      XBRK transmit break, 0=normal operation
3494          * 05      Stop bits (0=1, 1=2)
3495          * 04..03  PAR[1..0] Parity (01=odd, 10=even)
3496          * 02      PAREN Parity Enable
3497          * 01..00  CHL[1..0] Character Length (00=8, 01=7)
3498          *
3499          */
3500         val = 0x00;
3501         if (info->params.data_bits != 8)
3502                 val |= BIT0;    /* 7 bits */
3503         if (info->params.stop_bits != 1)
3504                 val |= BIT5;
3505         if (info->params.parity != ASYNC_PARITY_NONE)
3506         {
3507                 val |= BIT2;    /* Parity enable */
3508                 if (info->params.parity == ASYNC_PARITY_ODD)
3509                         val |= BIT3;
3510                 else
3511                         val |= BIT4;
3512         }
3513         write_reg(info, CHA + DAFO, val);
3514
3515         /* RFC Rx FIFO Control
3516          *
3517          * 07      Reserved, 0
3518          * 06      DPS, 1=parity bit not stored in data byte
3519          * 05      DXS, 0=all data stored in FIFO (including XON/XOFF)
3520          * 04      RFDF Rx FIFO Data Format, 1=status byte stored in FIFO
3521          * 03..02  RFTH[1..0], rx threshold, 11=16 status + 16 data byte
3522          * 01      Reserved, 0
3523          * 00      TCDE Terminate Char Detect Enable, 0=disabled
3524          *
3525          * 0101 1100
3526          */
3527         write_reg(info, CHA + RFC, 0x5c);
3528
3529         /* RLCR Receive length check register
3530          *
3531          * Max frame length = (RL + 1) * 32
3532          */
3533         write_reg(info, CHA + RLCR, 0);
3534
3535         /* XBCH Transmit Byte Count High
3536          *
3537          * 07      DMA mode, 0 = interrupt driven
3538          * 06      NRM, 0=ABM (ignored)
3539          * 05      CAS Carrier Auto Start
3540          * 04      XC Transmit Continuously (ignored)
3541          * 03..00  XBC[10..8] Transmit byte count bits 10..8
3542          *
3543          * 0000 0000
3544          */
3545         val = 0x00;
3546         if (info->params.flags & HDLC_FLAG_AUTO_DCD)
3547                 val |= BIT5;
3548         write_reg(info, CHA + XBCH, val);
3549         if (info->params.flags & HDLC_FLAG_AUTO_CTS)
3550                 irq_enable(info, CHA, IRQ_CTS);
3551
3552         /* MODE:03 RAC Receiver Active, 1=active */
3553         set_reg_bits(info, CHA + MODE, BIT3);
3554         enable_auxclk(info);
3555         if (info->params.flags & HDLC_FLAG_AUTO_CTS) {
3556                 irq_enable(info, CHB, IRQ_CTS);
3557                 /* PVR[3] 1=AUTO CTS active */
3558                 set_reg_bits(info, CHA + PVR, BIT3);
3559         } else
3560                 clear_reg_bits(info, CHA + PVR, BIT3);
3561         irq_enable(info, CHA,
3562                           IRQ_RXEOM | IRQ_RXFIFO | IRQ_BREAK_ON | IRQ_RXTIME |
3563                           IRQ_ALLSENT | IRQ_TXFIFO);
3564         issue_command(info, CHA, CMD_TXRESET + CMD_RXRESET);
3565         wait_command_complete(info, CHA);
3566         read_reg16(info, CHA + ISR);    /* clear pending IRQs */
3567 }
3568
3569 /* Set the HDLC idle mode for the transmitter.
3570  */
3571 static void tx_set_idle(MGSLPC_INFO *info)
3572 {
3573         /* Note: ESCC2 only supports flags and one idle modes */
3574         if (info->idle_mode == HDLC_TXIDLE_FLAGS)
3575                 set_reg_bits(info, CHA + CCR1, BIT3);
3576         else
3577                 clear_reg_bits(info, CHA + CCR1, BIT3);
3578 }
3579
3580 /* get state of the V24 status (input) signals.
3581  */
3582 static void get_signals(MGSLPC_INFO *info)
3583 {
3584         unsigned char status = 0;
3585
3586         /* preserve RTS and DTR */
3587         info->serial_signals &= SerialSignal_RTS | SerialSignal_DTR;
3588
3589         if (read_reg(info, CHB + VSTR) & BIT7)
3590                 info->serial_signals |= SerialSignal_DCD;
3591         if (read_reg(info, CHB + STAR) & BIT1)
3592                 info->serial_signals |= SerialSignal_CTS;
3593
3594         status = read_reg(info, CHA + PVR);
3595         if (!(status & PVR_RI))
3596                 info->serial_signals |= SerialSignal_RI;
3597         if (!(status & PVR_DSR))
3598                 info->serial_signals |= SerialSignal_DSR;
3599 }
3600
3601 /* Set the state of RTS and DTR based on contents of
3602  * serial_signals member of device extension.
3603  */
3604 static void set_signals(MGSLPC_INFO *info)
3605 {
3606         unsigned char val;
3607
3608         val = read_reg(info, CHA + MODE);
3609         if (info->params.mode == MGSL_MODE_ASYNC) {
3610                 if (info->serial_signals & SerialSignal_RTS)
3611                         val &= ~BIT6;
3612                 else
3613                         val |= BIT6;
3614         } else {
3615                 if (info->serial_signals & SerialSignal_RTS)
3616                         val |= BIT2;
3617                 else
3618                         val &= ~BIT2;
3619         }
3620         write_reg(info, CHA + MODE, val);
3621
3622         if (info->serial_signals & SerialSignal_DTR)
3623                 clear_reg_bits(info, CHA + PVR, PVR_DTR);
3624         else
3625                 set_reg_bits(info, CHA + PVR, PVR_DTR);
3626 }
3627
3628 static void rx_reset_buffers(MGSLPC_INFO *info)
3629 {
3630         RXBUF *buf;
3631         int i;
3632
3633         info->rx_put = 0;
3634         info->rx_get = 0;
3635         info->rx_frame_count = 0;
3636         for (i=0 ; i < info->rx_buf_count ; i++) {
3637                 buf = (RXBUF*)(info->rx_buf + (i * info->rx_buf_size));
3638                 buf->status = buf->count = 0;
3639         }
3640 }
3641
3642 /* Attempt to return a received HDLC frame
3643  * Only frames received without errors are returned.
3644  *
3645  * Returns true if frame returned, otherwise false
3646  */
3647 static bool rx_get_frame(MGSLPC_INFO *info, struct tty_struct *tty)
3648 {
3649         unsigned short status;
3650         RXBUF *buf;
3651         unsigned int framesize = 0;
3652         unsigned long flags;
3653         bool return_frame = false;
3654
3655         if (info->rx_frame_count == 0)
3656                 return false;
3657
3658         buf = (RXBUF*)(info->rx_buf + (info->rx_get * info->rx_buf_size));
3659
3660         status = buf->status;
3661
3662         /* 07  VFR  1=valid frame
3663          * 06  RDO  1=data overrun
3664          * 05  CRC  1=OK, 0=error
3665          * 04  RAB  1=frame aborted
3666          */
3667         if ((status & 0xf0) != 0xA0) {
3668                 if (!(status & BIT7) || (status & BIT4))
3669                         info->icount.rxabort++;
3670                 else if (status & BIT6)
3671                         info->icount.rxover++;
3672                 else if (!(status & BIT5)) {
3673                         info->icount.rxcrc++;
3674                         if (info->params.crc_type & HDLC_CRC_RETURN_EX)
3675                                 return_frame = true;
3676                 }
3677                 framesize = 0;
3678 #if SYNCLINK_GENERIC_HDLC
3679                 {
3680                         info->netdev->stats.rx_errors++;
3681                         info->netdev->stats.rx_frame_errors++;
3682                 }
3683 #endif
3684         } else
3685                 return_frame = true;
3686
3687         if (return_frame)
3688                 framesize = buf->count;
3689
3690         if (debug_level >= DEBUG_LEVEL_BH)
3691                 printk("%s(%d):rx_get_frame(%s) status=%04X size=%d\n",
3692                         __FILE__, __LINE__, info->device_name, status, framesize);
3693
3694         if (debug_level >= DEBUG_LEVEL_DATA)
3695                 trace_block(info, buf->data, framesize, 0);
3696
3697         if (framesize) {
3698                 if ((info->params.crc_type & HDLC_CRC_RETURN_EX &&
3699                       framesize+1 > info->max_frame_size) ||
3700                     framesize > info->max_frame_size)
3701                         info->icount.rxlong++;
3702                 else {
3703                         if (status & BIT5)
3704                                 info->icount.rxok++;
3705
3706                         if (info->params.crc_type & HDLC_CRC_RETURN_EX) {
3707                                 *(buf->data + framesize) = status & BIT5 ? RX_OK:RX_CRC_ERROR;
3708                                 ++framesize;
3709                         }
3710
3711 #if SYNCLINK_GENERIC_HDLC
3712                         if (info->netcount)
3713                                 hdlcdev_rx(info, buf->data, framesize);
3714                         else
3715 #endif
3716                                 ldisc_receive_buf(tty, buf->data, info->flag_buf, framesize);
3717                 }
3718         }
3719
3720         spin_lock_irqsave(&info->lock, flags);
3721         buf->status = buf->count = 0;
3722         info->rx_frame_count--;
3723         info->rx_get++;
3724         if (info->rx_get >= info->rx_buf_count)
3725                 info->rx_get = 0;
3726         spin_unlock_irqrestore(&info->lock, flags);
3727
3728         return true;
3729 }
3730
3731 static bool register_test(MGSLPC_INFO *info)
3732 {
3733         static unsigned char patterns[] =
3734             { 0x00, 0xff, 0xaa, 0x55, 0x69, 0x96, 0x0f };
3735         static unsigned int count = ARRAY_SIZE(patterns);
3736         unsigned int i;
3737         bool rc = true;
3738         unsigned long flags;
3739
3740         spin_lock_irqsave(&info->lock, flags);
3741         reset_device(info);
3742
3743         for (i = 0; i < count; i++) {
3744                 write_reg(info, XAD1, patterns[i]);
3745                 write_reg(info, XAD2, patterns[(i + 1) % count]);
3746                 if ((read_reg(info, XAD1) != patterns[i]) ||
3747                     (read_reg(info, XAD2) != patterns[(i + 1) % count])) {
3748                         rc = false;
3749                         break;
3750                 }
3751         }
3752
3753         spin_unlock_irqrestore(&info->lock, flags);
3754         return rc;
3755 }
3756
3757 static bool irq_test(MGSLPC_INFO *info)
3758 {
3759         unsigned long end_time;
3760         unsigned long flags;
3761
3762         spin_lock_irqsave(&info->lock, flags);
3763         reset_device(info);
3764
3765         info->testing_irq = true;
3766         hdlc_mode(info);
3767
3768         info->irq_occurred = false;
3769
3770         /* init hdlc mode */
3771
3772         irq_enable(info, CHA, IRQ_TIMER);
3773         write_reg(info, CHA + TIMR, 0); /* 512 cycles */
3774         issue_command(info, CHA, CMD_START_TIMER);
3775
3776         spin_unlock_irqrestore(&info->lock, flags);
3777
3778         end_time=100;
3779         while(end_time-- && !info->irq_occurred) {
3780                 msleep_interruptible(10);
3781         }
3782
3783         info->testing_irq = false;
3784
3785         spin_lock_irqsave(&info->lock, flags);
3786         reset_device(info);
3787         spin_unlock_irqrestore(&info->lock, flags);
3788
3789         return info->irq_occurred;
3790 }
3791
3792 static int adapter_test(MGSLPC_INFO *info)
3793 {
3794         if (!register_test(info)) {
3795                 info->init_error = DiagStatus_AddressFailure;
3796                 printk("%s(%d):Register test failure for device %s Addr=%04X\n",
3797                         __FILE__, __LINE__, info->device_name, (unsigned short)(info->io_base));
3798                 return -ENODEV;
3799         }
3800
3801         if (!irq_test(info)) {
3802                 info->init_error = DiagStatus_IrqFailure;
3803                 printk("%s(%d):Interrupt test failure for device %s IRQ=%d\n",
3804                         __FILE__, __LINE__, info->device_name, (unsigned short)(info->irq_level));
3805                 return -ENODEV;
3806         }
3807
3808         if (debug_level >= DEBUG_LEVEL_INFO)
3809                 printk("%s(%d):device %s passed diagnostics\n",
3810                         __FILE__, __LINE__, info->device_name);
3811         return 0;
3812 }
3813
3814 static void trace_block(MGSLPC_INFO *info,const char* data, int count, int xmit)
3815 {
3816         int i;
3817         int linecount;
3818         if (xmit)
3819                 printk("%s tx data:\n", info->device_name);
3820         else
3821                 printk("%s rx data:\n", info->device_name);
3822
3823         while(count) {
3824                 if (count > 16)
3825                         linecount = 16;
3826                 else
3827                         linecount = count;
3828
3829                 for(i=0;i<linecount;i++)
3830                         printk("%02X ", (unsigned char)data[i]);
3831                 for(;i<17;i++)
3832                         printk("   ");
3833                 for(i=0;i<linecount;i++) {
3834                         if (data[i]>=040 && data[i]<=0176)
3835                                 printk("%c", data[i]);
3836                         else
3837                                 printk(".");
3838                 }
3839                 printk("\n");
3840
3841                 data  += linecount;
3842                 count -= linecount;
3843         }
3844 }
3845
3846 /* HDLC frame time out
3847  * update stats and do tx completion processing
3848  */
3849 static void tx_timeout(unsigned long context)
3850 {
3851         MGSLPC_INFO *info = (MGSLPC_INFO*)context;
3852         unsigned long flags;
3853
3854         if (debug_level >= DEBUG_LEVEL_INFO)
3855                 printk("%s(%d):tx_timeout(%s)\n",
3856                         __FILE__, __LINE__, info->device_name);
3857         if (info->tx_active &&
3858             info->params.mode == MGSL_MODE_HDLC) {
3859                 info->icount.txtimeout++;
3860         }
3861         spin_lock_irqsave(&info->lock, flags);
3862         info->tx_active = false;
3863         info->tx_count = info->tx_put = info->tx_get = 0;
3864
3865         spin_unlock_irqrestore(&info->lock, flags);
3866
3867 #if SYNCLINK_GENERIC_HDLC
3868         if (info->netcount)
3869                 hdlcdev_tx_done(info);
3870         else
3871 #endif
3872         {
3873                 struct tty_struct *tty = tty_port_tty_get(&info->port);
3874                 bh_transmit(info, tty);
3875                 tty_kref_put(tty);
3876         }
3877 }
3878
3879 #if SYNCLINK_GENERIC_HDLC
3880
3881 /**
3882  * called by generic HDLC layer when protocol selected (PPP, frame relay, etc.)
3883  * set encoding and frame check sequence (FCS) options
3884  *
3885  * dev       pointer to network device structure
3886  * encoding  serial encoding setting
3887  * parity    FCS setting
3888  *
3889  * returns 0 if success, otherwise error code
3890  */
3891 static int hdlcdev_attach(struct net_device *dev, unsigned short encoding,
3892                           unsigned short parity)
3893 {
3894         MGSLPC_INFO *info = dev_to_port(dev);
3895         struct tty_struct *tty;
3896         unsigned char  new_encoding;
3897         unsigned short new_crctype;
3898
3899         /* return error if TTY interface open */
3900         if (info->port.count)
3901                 return -EBUSY;
3902
3903         switch (encoding)
3904         {
3905         case ENCODING_NRZ:        new_encoding = HDLC_ENCODING_NRZ; break;
3906         case ENCODING_NRZI:       new_encoding = HDLC_ENCODING_NRZI_SPACE; break;
3907         case ENCODING_FM_MARK:    new_encoding = HDLC_ENCODING_BIPHASE_MARK; break;
3908         case ENCODING_FM_SPACE:   new_encoding = HDLC_ENCODING_BIPHASE_SPACE; break;
3909         case ENCODING_MANCHESTER: new_encoding = HDLC_ENCODING_BIPHASE_LEVEL; break;
3910         default: return -EINVAL;
3911         }
3912
3913         switch (parity)
3914         {
3915         case PARITY_NONE:            new_crctype = HDLC_CRC_NONE; break;
3916         case PARITY_CRC16_PR1_CCITT: new_crctype = HDLC_CRC_16_CCITT; break;
3917         case PARITY_CRC32_PR1_CCITT: new_crctype = HDLC_CRC_32_CCITT; break;
3918         default: return -EINVAL;
3919         }
3920
3921         info->params.encoding = new_encoding;
3922         info->params.crc_type = new_crctype;
3923
3924         /* if network interface up, reprogram hardware */
3925         if (info->netcount) {
3926                 tty = tty_port_tty_get(&info->port);
3927                 mgslpc_program_hw(info, tty);
3928                 tty_kref_put(tty);
3929         }
3930
3931         return 0;
3932 }
3933
3934 /**
3935  * called by generic HDLC layer to send frame
3936  *
3937  * skb  socket buffer containing HDLC frame
3938  * dev  pointer to network device structure
3939  */
3940 static netdev_tx_t hdlcdev_xmit(struct sk_buff *skb,
3941                                       struct net_device *dev)
3942 {
3943         MGSLPC_INFO *info = dev_to_port(dev);
3944         unsigned long flags;
3945
3946         if (debug_level >= DEBUG_LEVEL_INFO)
3947                 printk(KERN_INFO "%s:hdlc_xmit(%s)\n", __FILE__, dev->name);
3948
3949         /* stop sending until this frame completes */
3950         netif_stop_queue(dev);
3951
3952         /* copy data to device buffers */
3953         skb_copy_from_linear_data(skb, info->tx_buf, skb->len);
3954         info->tx_get = 0;
3955         info->tx_put = info->tx_count = skb->len;
3956
3957         /* update network statistics */
3958         dev->stats.tx_packets++;
3959         dev->stats.tx_bytes += skb->len;
3960
3961         /* done with socket buffer, so free it */
3962         dev_kfree_skb(skb);
3963
3964         /* save start time for transmit timeout detection */
3965         netif_trans_update(dev);
3966
3967         /* start hardware transmitter if necessary */
3968         spin_lock_irqsave(&info->lock, flags);
3969         if (!info->tx_active) {
3970                 struct tty_struct *tty = tty_port_tty_get(&info->port);
3971                 tx_start(info, tty);
3972                 tty_kref_put(tty);
3973         }
3974         spin_unlock_irqrestore(&info->lock, flags);
3975
3976         return NETDEV_TX_OK;
3977 }
3978
3979 /**
3980  * called by network layer when interface enabled
3981  * claim resources and initialize hardware
3982  *
3983  * dev  pointer to network device structure
3984  *
3985  * returns 0 if success, otherwise error code
3986  */
3987 static int hdlcdev_open(struct net_device *dev)
3988 {
3989         MGSLPC_INFO *info = dev_to_port(dev);
3990         struct tty_struct *tty;
3991         int rc;
3992         unsigned long flags;
3993
3994         if (debug_level >= DEBUG_LEVEL_INFO)
3995                 printk("%s:hdlcdev_open(%s)\n", __FILE__, dev->name);
3996
3997         /* generic HDLC layer open processing */
3998         rc = hdlc_open(dev);
3999         if (rc != 0)
4000                 return rc;
4001
4002         /* arbitrate between network and tty opens */
4003         spin_lock_irqsave(&info->netlock, flags);
4004         if (info->port.count != 0 || info->netcount != 0) {
4005                 printk(KERN_WARNING "%s: hdlc_open returning busy\n", dev->name);
4006                 spin_unlock_irqrestore(&info->netlock, flags);
4007                 return -EBUSY;
4008         }
4009         info->netcount=1;
4010         spin_unlock_irqrestore(&info->netlock, flags);
4011
4012         tty = tty_port_tty_get(&info->port);
4013         /* claim resources and init adapter */
4014         rc = startup(info, tty);
4015         if (rc != 0) {
4016                 tty_kref_put(tty);
4017                 spin_lock_irqsave(&info->netlock, flags);
4018                 info->netcount=0;
4019                 spin_unlock_irqrestore(&info->netlock, flags);
4020                 return rc;
4021         }
4022         /* assert RTS and DTR, apply hardware settings */
4023         info->serial_signals |= SerialSignal_RTS | SerialSignal_DTR;
4024         mgslpc_program_hw(info, tty);
4025         tty_kref_put(tty);
4026
4027         /* enable network layer transmit */
4028         netif_trans_update(dev);
4029         netif_start_queue(dev);
4030
4031         /* inform generic HDLC layer of current DCD status */
4032         spin_lock_irqsave(&info->lock, flags);
4033         get_signals(info);
4034         spin_unlock_irqrestore(&info->lock, flags);
4035         if (info->serial_signals & SerialSignal_DCD)
4036                 netif_carrier_on(dev);
4037         else
4038                 netif_carrier_off(dev);
4039         return 0;
4040 }
4041
4042 /**
4043  * called by network layer when interface is disabled
4044  * shutdown hardware and release resources
4045  *
4046  * dev  pointer to network device structure
4047  *
4048  * returns 0 if success, otherwise error code
4049  */
4050 static int hdlcdev_close(struct net_device *dev)
4051 {
4052         MGSLPC_INFO *info = dev_to_port(dev);
4053         struct tty_struct *tty = tty_port_tty_get(&info->port);
4054         unsigned long flags;
4055
4056         if (debug_level >= DEBUG_LEVEL_INFO)
4057                 printk("%s:hdlcdev_close(%s)\n", __FILE__, dev->name);
4058
4059         netif_stop_queue(dev);
4060
4061         /* shutdown adapter and release resources */
4062         shutdown(info, tty);
4063         tty_kref_put(tty);
4064         hdlc_close(dev);
4065
4066         spin_lock_irqsave(&info->netlock, flags);
4067         info->netcount=0;
4068         spin_unlock_irqrestore(&info->netlock, flags);
4069
4070         return 0;
4071 }
4072
4073 /**
4074  * called by network layer to process IOCTL call to network device
4075  *
4076  * dev  pointer to network device structure
4077  * ifr  pointer to network interface request structure
4078  * cmd  IOCTL command code
4079  *
4080  * returns 0 if success, otherwise error code
4081  */
4082 static int hdlcdev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
4083 {
4084         const size_t size = sizeof(sync_serial_settings);
4085         sync_serial_settings new_line;
4086         sync_serial_settings __user *line = ifr->ifr_settings.ifs_ifsu.sync;
4087         MGSLPC_INFO *info = dev_to_port(dev);
4088         unsigned int flags;
4089
4090         if (debug_level >= DEBUG_LEVEL_INFO)
4091                 printk("%s:hdlcdev_ioctl(%s)\n", __FILE__, dev->name);
4092
4093         /* return error if TTY interface open */
4094         if (info->port.count)
4095                 return -EBUSY;
4096
4097         if (cmd != SIOCWANDEV)
4098                 return hdlc_ioctl(dev, ifr, cmd);
4099
4100         memset(&new_line, 0, size);
4101
4102         switch(ifr->ifr_settings.type) {
4103         case IF_GET_IFACE: /* return current sync_serial_settings */
4104
4105                 ifr->ifr_settings.type = IF_IFACE_SYNC_SERIAL;
4106                 if (ifr->ifr_settings.size < size) {
4107                         ifr->ifr_settings.size = size; /* data size wanted */
4108                         return -ENOBUFS;
4109                 }
4110
4111                 flags = info->params.flags & (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
4112                                               HDLC_FLAG_RXC_BRG    | HDLC_FLAG_RXC_TXCPIN |
4113                                               HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
4114                                               HDLC_FLAG_TXC_BRG    | HDLC_FLAG_TXC_RXCPIN);
4115
4116                 switch (flags){
4117                 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN): new_line.clock_type = CLOCK_EXT; break;
4118                 case (HDLC_FLAG_RXC_BRG    | HDLC_FLAG_TXC_BRG):    new_line.clock_type = CLOCK_INT; break;
4119                 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG):    new_line.clock_type = CLOCK_TXINT; break;
4120                 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN): new_line.clock_type = CLOCK_TXFROMRX; break;
4121                 default: new_line.clock_type = CLOCK_DEFAULT;
4122                 }
4123
4124                 new_line.clock_rate = info->params.clock_speed;
4125                 new_line.loopback   = info->params.loopback ? 1:0;
4126
4127                 if (copy_to_user(line, &new_line, size))
4128                         return -EFAULT;
4129                 return 0;
4130
4131         case IF_IFACE_SYNC_SERIAL: /* set sync_serial_settings */
4132
4133                 if(!capable(CAP_NET_ADMIN))
4134                         return -EPERM;
4135                 if (copy_from_user(&new_line, line, size))
4136                         return -EFAULT;
4137
4138                 switch (new_line.clock_type)
4139                 {
4140                 case CLOCK_EXT:      flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN; break;
4141                 case CLOCK_TXFROMRX: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN; break;
4142                 case CLOCK_INT:      flags = HDLC_FLAG_RXC_BRG    | HDLC_FLAG_TXC_BRG;    break;
4143                 case CLOCK_TXINT:    flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG;    break;
4144                 case CLOCK_DEFAULT:  flags = info->params.flags &
4145                                              (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
4146                                               HDLC_FLAG_RXC_BRG    | HDLC_FLAG_RXC_TXCPIN |
4147                                               HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
4148                                               HDLC_FLAG_TXC_BRG    | HDLC_FLAG_TXC_RXCPIN); break;
4149                 default: return -EINVAL;
4150                 }
4151
4152                 if (new_line.loopback != 0 && new_line.loopback != 1)
4153                         return -EINVAL;
4154
4155                 info->params.flags &= ~(HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
4156                                         HDLC_FLAG_RXC_BRG    | HDLC_FLAG_RXC_TXCPIN |
4157                                         HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
4158                                         HDLC_FLAG_TXC_BRG    | HDLC_FLAG_TXC_RXCPIN);
4159                 info->params.flags |= flags;
4160
4161                 info->params.loopback = new_line.loopback;
4162
4163                 if (flags & (HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG))
4164                         info->params.clock_speed = new_line.clock_rate;
4165                 else
4166                         info->params.clock_speed = 0;
4167
4168                 /* if network interface up, reprogram hardware */
4169                 if (info->netcount) {
4170                         struct tty_struct *tty = tty_port_tty_get(&info->port);
4171                         mgslpc_program_hw(info, tty);
4172                         tty_kref_put(tty);
4173                 }
4174                 return 0;
4175
4176         default:
4177                 return hdlc_ioctl(dev, ifr, cmd);
4178         }
4179 }
4180
4181 /**
4182  * called by network layer when transmit timeout is detected
4183  *
4184  * dev  pointer to network device structure
4185  */
4186 static void hdlcdev_tx_timeout(struct net_device *dev)
4187 {
4188         MGSLPC_INFO *info = dev_to_port(dev);
4189         unsigned long flags;
4190
4191         if (debug_level >= DEBUG_LEVEL_INFO)
4192                 printk("hdlcdev_tx_timeout(%s)\n", dev->name);
4193
4194         dev->stats.tx_errors++;
4195         dev->stats.tx_aborted_errors++;
4196
4197         spin_lock_irqsave(&info->lock, flags);
4198         tx_stop(info);
4199         spin_unlock_irqrestore(&info->lock, flags);
4200
4201         netif_wake_queue(dev);
4202 }
4203
4204 /**
4205  * called by device driver when transmit completes
4206  * reenable network layer transmit if stopped
4207  *
4208  * info  pointer to device instance information
4209  */
4210 static void hdlcdev_tx_done(MGSLPC_INFO *info)
4211 {
4212         if (netif_queue_stopped(info->netdev))
4213                 netif_wake_queue(info->netdev);
4214 }
4215
4216 /**
4217  * called by device driver when frame received
4218  * pass frame to network layer
4219  *
4220  * info  pointer to device instance information
4221  * buf   pointer to buffer contianing frame data
4222  * size  count of data bytes in buf
4223  */
4224 static void hdlcdev_rx(MGSLPC_INFO *info, char *buf, int size)
4225 {
4226         struct sk_buff *skb = dev_alloc_skb(size);
4227         struct net_device *dev = info->netdev;
4228
4229         if (debug_level >= DEBUG_LEVEL_INFO)
4230                 printk("hdlcdev_rx(%s)\n", dev->name);
4231
4232         if (skb == NULL) {
4233                 printk(KERN_NOTICE "%s: can't alloc skb, dropping packet\n", dev->name);
4234                 dev->stats.rx_dropped++;
4235                 return;
4236         }
4237
4238         memcpy(skb_put(skb, size), buf, size);
4239
4240         skb->protocol = hdlc_type_trans(skb, dev);
4241
4242         dev->stats.rx_packets++;
4243         dev->stats.rx_bytes += size;
4244
4245         netif_rx(skb);
4246 }
4247
4248 static const struct net_device_ops hdlcdev_ops = {
4249         .ndo_open       = hdlcdev_open,
4250         .ndo_stop       = hdlcdev_close,
4251         .ndo_start_xmit = hdlc_start_xmit,
4252         .ndo_do_ioctl   = hdlcdev_ioctl,
4253         .ndo_tx_timeout = hdlcdev_tx_timeout,
4254 };
4255
4256 /**
4257  * called by device driver when adding device instance
4258  * do generic HDLC initialization
4259  *
4260  * info  pointer to device instance information
4261  *
4262  * returns 0 if success, otherwise error code
4263  */
4264 static int hdlcdev_init(MGSLPC_INFO *info)
4265 {
4266         int rc;
4267         struct net_device *dev;
4268         hdlc_device *hdlc;
4269
4270         /* allocate and initialize network and HDLC layer objects */
4271
4272         dev = alloc_hdlcdev(info);
4273         if (dev == NULL) {
4274                 printk(KERN_ERR "%s:hdlc device allocation failure\n", __FILE__);
4275                 return -ENOMEM;
4276         }
4277
4278         /* for network layer reporting purposes only */
4279         dev->base_addr = info->io_base;
4280         dev->irq       = info->irq_level;
4281
4282         /* network layer callbacks and settings */
4283         dev->netdev_ops     = &hdlcdev_ops;
4284         dev->watchdog_timeo = 10 * HZ;
4285         dev->tx_queue_len   = 50;
4286
4287         /* generic HDLC layer callbacks and settings */
4288         hdlc         = dev_to_hdlc(dev);
4289         hdlc->attach = hdlcdev_attach;
4290         hdlc->xmit   = hdlcdev_xmit;
4291
4292         /* register objects with HDLC layer */
4293         rc = register_hdlc_device(dev);
4294         if (rc) {
4295                 printk(KERN_WARNING "%s:unable to register hdlc device\n", __FILE__);
4296                 free_netdev(dev);
4297                 return rc;
4298         }
4299
4300         info->netdev = dev;
4301         return 0;
4302 }
4303
4304 /**
4305  * called by device driver when removing device instance
4306  * do generic HDLC cleanup
4307  *
4308  * info  pointer to device instance information
4309  */
4310 static void hdlcdev_exit(MGSLPC_INFO *info)
4311 {
4312         unregister_hdlc_device(info->netdev);
4313         free_netdev(info->netdev);
4314         info->netdev = NULL;
4315 }
4316
4317 #endif /* CONFIG_HDLC */
4318