drivers/s390/char/con3215.c

   1 /*
   2  * 3215 line mode terminal driver.
   3  *
   4  * Copyright IBM Corp. 1999, 2009
   5  * Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>
   6  *
   7  * Updated:
   8  *  Aug-2000: Added tab support
   9  *            Dan Morrison, IBM Corporation <dmorriso@cse.buffalo.edu>
  10  */
  11
  12 #include <linux/module.h>
  13 #include <linux/types.h>
  14 #include <linux/kdev_t.h>
  15 #include <linux/tty.h>
  16 #include <linux/tty_flip.h>
  17 #include <linux/vt_kern.h>
  18 #include <linux/init.h>
  19 #include <linux/console.h>
  20 #include <linux/interrupt.h>
  21 #include <linux/err.h>
  22 #include <linux/reboot.h>
  23 #include <linux/serial.h> /* ASYNC_* flags */
  24 #include <linux/slab.h>
  25 #include <asm/ccwdev.h>
  26 #include <asm/cio.h>
  27 #include <asm/io.h>
  28 #include <asm/ebcdic.h>
  29 #include <asm/uaccess.h>
  30 #include <asm/delay.h>
  31 #include <asm/cpcmd.h>
  32 #include <asm/setup.h>
  33
  34 #include "ctrlchar.h"
  35
  36 #define NR_3215             1
  37 #define NR_3215_REQ         (4*NR_3215)
  38 #define RAW3215_BUFFER_SIZE 65536     /* output buffer size */
  39 #define RAW3215_INBUF_SIZE  256       /* input buffer size */
  40 #define RAW3215_MIN_SPACE   128       /* minimum free space for wakeup */
  41 #define RAW3215_MIN_WRITE   1024      /* min. length for immediate output */
  42 #define RAW3215_MAX_BYTES   3968      /* max. bytes to write with one ssch */
  43 #define RAW3215_MAX_NEWLINE 50        /* max. lines to write with one ssch */
  44 #define RAW3215_NR_CCWS     3
  45 #define RAW3215_TIMEOUT     HZ/10     /* time for delayed output */
  46
  47 #define RAW3215_FIXED       1         /* 3215 console device is not be freed */
  48 #define RAW3215_WORKING     4         /* set if a request is being worked on */
  49 #define RAW3215_THROTTLED   8         /* set if reading is disabled */
  50 #define RAW3215_STOPPED     16        /* set if writing is disabled */
  51 #define RAW3215_TIMER_RUNS  64        /* set if the output delay timer is on */
  52 #define RAW3215_FLUSHING    128       /* set to flush buffer (no delay) */
  53
  54 #define TAB_STOP_SIZE       8         /* tab stop size */
  55
  56 /*
  57  * Request types for a 3215 device
  58  */
  59 enum raw3215_type {
  60         RAW3215_FREE, RAW3215_READ, RAW3215_WRITE
  61 };
  62
  63 /*
  64  * Request structure for a 3215 device
  65  */
  66 struct raw3215_req {
  67         enum raw3215_type type;       /* type of the request */
  68         int start, len;               /* start index & len in output buffer */
  69         int delayable;                /* indication to wait for more data */
  70         int residual;                 /* residual count for read request */
  71         struct ccw1 ccws[RAW3215_NR_CCWS]; /* space for the channel program */
  72         struct raw3215_info *info;    /* pointer to main structure */
  73         struct raw3215_req *next;     /* pointer to next request */
  74 } __attribute__ ((aligned(8)));
  75
  76 struct raw3215_info {
  77         struct tty_port port;
  78         struct ccw_device *cdev;      /* device for tty driver */
  79         spinlock_t *lock;             /* pointer to irq lock */
  80         int flags;                    /* state flags */
  81         char *buffer;                 /* pointer to output buffer */
  82         char *inbuf;                  /* pointer to input buffer */
  83         int head;                     /* first free byte in output buffer */
  84         int count;                    /* number of bytes in output buffer */
  85         int written;                  /* number of bytes in write requests */
  86         struct raw3215_req *queued_read; /* pointer to queued read requests */
  87         struct raw3215_req *queued_write;/* pointer to queued write requests */
  88         struct tasklet_struct tlet;   /* tasklet to invoke tty_wakeup */
  89         wait_queue_head_t empty_wait; /* wait queue for flushing */
  90         struct timer_list timer;      /* timer for delayed output */
  91         int line_pos;                 /* position on the line (for tabs) */
  92         char ubuffer[80];             /* copy_from_user buffer */
  93 };
  94
  95 /* array of 3215 devices structures */
  96 static struct raw3215_info *raw3215[NR_3215];
  97 /* spinlock to protect the raw3215 array */
  98 static DEFINE_SPINLOCK(raw3215_device_lock);
  99 /* list of free request structures */
 100 static struct raw3215_req *raw3215_freelist;
 101 /* spinlock to protect free list */
 102 static spinlock_t raw3215_freelist_lock;
 103
 104 static struct tty_driver *tty3215_driver;
 105
 106 /*
 107  * Get a request structure from the free list
 108  */
 109 static inline struct raw3215_req *raw3215_alloc_req(void)
 110 {
 111         struct raw3215_req *req;
 112         unsigned long flags;
 113
 114         spin_lock_irqsave(&raw3215_freelist_lock, flags);
 115         req = raw3215_freelist;
 116         raw3215_freelist = req->next;
 117         spin_unlock_irqrestore(&raw3215_freelist_lock, flags);
 118         return req;
 119 }
 120
 121 /*
 122  * Put a request structure back to the free list
 123  */
 124 static inline void raw3215_free_req(struct raw3215_req *req)
 125 {
 126         unsigned long flags;
 127
 128         if (req->type == RAW3215_FREE)
 129                 return;         /* don't free a free request */
 130         req->type = RAW3215_FREE;
 131         spin_lock_irqsave(&raw3215_freelist_lock, flags);
 132         req->next = raw3215_freelist;
 133         raw3215_freelist = req;
 134         spin_unlock_irqrestore(&raw3215_freelist_lock, flags);
 135 }
 136
 137 /*
 138  * Set up a read request that reads up to 160 byte from the 3215 device.
 139  * If there is a queued read request it is used, but that shouldn't happen
 140  * because a 3215 terminal won't accept a new read before the old one is
 141  * completed.
 142  */
 143 static void raw3215_mk_read_req(struct raw3215_info *raw)
 144 {
 145         struct raw3215_req *req;
 146         struct ccw1 *ccw;
 147
 148         /* there can only be ONE read request at a time */
 149         req = raw->queued_read;
 150         if (req == NULL) {
 151                 /* no queued read request, use new req structure */
 152                 req = raw3215_alloc_req();
 153                 req->type = RAW3215_READ;
 154                 req->info = raw;
 155                 raw->queued_read = req;
 156         }
 157
 158         ccw = req->ccws;
 159         ccw->cmd_code = 0x0A; /* read inquiry */
 160         ccw->flags = 0x20;    /* ignore incorrect length */
 161         ccw->count = 160;
 162         ccw->cda = (__u32) __pa(raw->inbuf);
 163 }
 164
 165 /*
 166  * Set up a write request with the information from the main structure.
 167  * A ccw chain is created that writes as much as possible from the output
 168  * buffer to the 3215 device. If a queued write exists it is replaced by
 169  * the new, probably lengthened request.
 170  */
 171 static void raw3215_mk_write_req(struct raw3215_info *raw)
 172 {
 173         struct raw3215_req *req;
 174         struct ccw1 *ccw;
 175         int len, count, ix, lines;
 176
 177         if (raw->count <= raw->written)
 178                 return;
 179         /* check if there is a queued write request */
 180         req = raw->queued_write;
 181         if (req == NULL) {
 182                 /* no queued write request, use new req structure */
 183                 req = raw3215_alloc_req();
 184                 req->type = RAW3215_WRITE;
 185                 req->info = raw;
 186                 raw->queued_write = req;
 187         } else {
 188                 raw->written -= req->len;
 189         }
 190
 191         ccw = req->ccws;
 192         req->start = (raw->head - raw->count + raw->written) &
 193                      (RAW3215_BUFFER_SIZE - 1);
 194         /*
 195          * now we have to count newlines. We can at max accept
 196          * RAW3215_MAX_NEWLINE newlines in a single ssch due to
 197          * a restriction in VM
 198          */
 199         lines = 0;
 200         ix = req->start;
 201         while (lines < RAW3215_MAX_NEWLINE && ix != raw->head) {
 202                 if (raw->buffer[ix] == 0x15)
 203                         lines++;
 204                 ix = (ix + 1) & (RAW3215_BUFFER_SIZE - 1);
 205         }
 206         len = ((ix - 1 - req->start) & (RAW3215_BUFFER_SIZE - 1)) + 1;
 207         if (len > RAW3215_MAX_BYTES)
 208                 len = RAW3215_MAX_BYTES;
 209         req->len = len;
 210         raw->written += len;
 211
 212         /* set the indication if we should try to enlarge this request */
 213         req->delayable = (ix == raw->head) && (len < RAW3215_MIN_WRITE);
 214
 215         ix = req->start;
 216         while (len > 0) {
 217                 if (ccw > req->ccws)
 218                         ccw[-1].flags |= 0x40; /* use command chaining */
 219                 ccw->cmd_code = 0x01; /* write, auto carrier return */
 220                 ccw->flags = 0x20;    /* ignore incorrect length ind.  */
 221                 ccw->cda =
 222                         (__u32) __pa(raw->buffer + ix);
 223                 count = len;
 224                 if (ix + count > RAW3215_BUFFER_SIZE)
 225                         count = RAW3215_BUFFER_SIZE - ix;
 226                 ccw->count = count;
 227                 len -= count;
 228                 ix = (ix + count) & (RAW3215_BUFFER_SIZE - 1);
 229                 ccw++;
 230         }
 231         /*
 232          * Add a NOP to the channel program. 3215 devices are purely
 233          * emulated and its much better to avoid the channel end
 234          * interrupt in this case.
 235          */
 236         if (ccw > req->ccws)
 237                 ccw[-1].flags |= 0x40; /* use command chaining */
 238         ccw->cmd_code = 0x03; /* NOP */
 239         ccw->flags = 0;
 240         ccw->cda = 0;
 241         ccw->count = 1;
 242 }
 243
 244 /*
 245  * Start a read or a write request
 246  */
 247 static void raw3215_start_io(struct raw3215_info *raw)
 248 {
 249         struct raw3215_req *req;
 250         int res;
 251
 252         req = raw->queued_read;
 253         if (req != NULL &&
 254             !(raw->flags & (RAW3215_WORKING | RAW3215_THROTTLED))) {
 255                 /* dequeue request */
 256                 raw->queued_read = NULL;
 257                 res = ccw_device_start(raw->cdev, req->ccws,
 258                                        (unsigned long) req, 0, 0);
 259                 if (res != 0) {
 260                         /* do_IO failed, put request back to queue */
 261                         raw->queued_read = req;
 262                 } else {
 263                         raw->flags |= RAW3215_WORKING;
 264                 }
 265         }
 266         req = raw->queued_write;
 267         if (req != NULL &&
 268             !(raw->flags & (RAW3215_WORKING | RAW3215_STOPPED))) {
 269                 /* dequeue request */
 270                 raw->queued_write = NULL;
 271                 res = ccw_device_start(raw->cdev, req->ccws,
 272                                        (unsigned long) req, 0, 0);
 273                 if (res != 0) {
 274                         /* do_IO failed, put request back to queue */
 275                         raw->queued_write = req;
 276                 } else {
 277                         raw->flags |= RAW3215_WORKING;
 278                 }
 279         }
 280 }
 281
 282 /*
 283  * Function to start a delayed output after RAW3215_TIMEOUT seconds
 284  */
 285 static void raw3215_timeout(unsigned long __data)
 286 {
 287         struct raw3215_info *raw = (struct raw3215_info *) __data;
 288         unsigned long flags;
 289
 290         spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
 291         if (raw->flags & RAW3215_TIMER_RUNS) {
 292                 del_timer(&raw->timer);
 293                 raw->flags &= ~RAW3215_TIMER_RUNS;
 294                 if (!(raw->port.flags & ASYNC_SUSPENDED)) {
 295                         raw3215_mk_write_req(raw);
 296                         raw3215_start_io(raw);
 297                 }
 298         }
 299         spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
 300 }
 301
 302 /*
 303  * Function to conditionally start an IO. A read is started immediately,
 304  * a write is only started immediately if the flush flag is on or the
 305  * amount of data is bigger than RAW3215_MIN_WRITE. If a write is not
 306  * done immediately a timer is started with a delay of RAW3215_TIMEOUT.
 307  */
 308 static inline void raw3215_try_io(struct raw3215_info *raw)
 309 {
 310         if (!(raw->port.flags & ASYNC_INITIALIZED) ||
 311                         (raw->port.flags & ASYNC_SUSPENDED))
 312                 return;
 313         if (raw->queued_read != NULL)
 314                 raw3215_start_io(raw);
 315         else if (raw->queued_write != NULL) {
 316                 if ((raw->queued_write->delayable == 0) ||
 317                     (raw->flags & RAW3215_FLUSHING)) {
 318                         /* execute write requests bigger than minimum size */
 319                         raw3215_start_io(raw);
 320                         if (raw->flags & RAW3215_TIMER_RUNS) {
 321                                 del_timer(&raw->timer);
 322                                 raw->flags &= ~RAW3215_TIMER_RUNS;
 323                         }
 324                 } else if (!(raw->flags & RAW3215_TIMER_RUNS)) {
 325                         /* delay small writes */
 326                         raw->timer.expires = RAW3215_TIMEOUT + jiffies;
 327                         add_timer(&raw->timer);
 328                         raw->flags |= RAW3215_TIMER_RUNS;
 329                 }
 330         }
 331 }
 332
 333 /*
 334  * Call tty_wakeup from tasklet context
 335  */
 336 static void raw3215_wakeup(unsigned long data)
 337 {
 338         struct raw3215_info *raw = (struct raw3215_info *) data;
 339         struct tty_struct *tty;
 340
 341         tty = tty_port_tty_get(&raw->port);
 342         if (tty) {
 343                 tty_wakeup(tty);
 344                 tty_kref_put(tty);
 345         }
 346 }
 347
 348 /*
 349  * Try to start the next IO and wake up processes waiting on the tty.
 350  */
 351 static void raw3215_next_io(struct raw3215_info *raw, struct tty_struct *tty)
 352 {
 353         raw3215_mk_write_req(raw);
 354         raw3215_try_io(raw);
 355         if (tty && RAW3215_BUFFER_SIZE - raw->count >= RAW3215_MIN_SPACE)
 356                 tasklet_schedule(&raw->tlet);
 357 }
 358
 359 /*
 360  * Interrupt routine, called from common io layer
 361  */
 362 static void raw3215_irq(struct ccw_device *cdev, unsigned long intparm,
 363                         struct irb *irb)
 364 {
 365         struct raw3215_info *raw;
 366         struct raw3215_req *req;
 367         struct tty_struct *tty;
 368         int cstat, dstat;
 369         int count;
 370
 371         raw = dev_get_drvdata(&cdev->dev);
 372         req = (struct raw3215_req *) intparm;
 373         tty = tty_port_tty_get(&raw->port);
 374         cstat = irb->scsw.cmd.cstat;
 375         dstat = irb->scsw.cmd.dstat;
 376         if (cstat != 0)
 377                 raw3215_next_io(raw, tty);
 378         if (dstat & 0x01) { /* we got a unit exception */
 379                 dstat &= ~0x01;  /* we can ignore it */
 380         }
 381         switch (dstat) {
 382         case 0x80:
 383                 if (cstat != 0)
 384                         break;
 385                 /* Attention interrupt, someone hit the enter key */
 386                 raw3215_mk_read_req(raw);
 387                 raw3215_next_io(raw, tty);
 388                 break;
 389         case 0x08:
 390         case 0x0C:
 391                 /* Channel end interrupt. */
 392                 if ((raw = req->info) == NULL)
 393                         goto put_tty;        /* That shouldn't happen ... */
 394                 if (req->type == RAW3215_READ) {
 395                         /* store residual count, then wait for device end */
 396                         req->residual = irb->scsw.cmd.count;
 397                 }
 398                 if (dstat == 0x08)
 399                         break;
 400         case 0x04:
 401                 /* Device end interrupt. */
 402                 if ((raw = req->info) == NULL)
 403                         goto put_tty;        /* That shouldn't happen ... */
 404                 if (req->type == RAW3215_READ && tty != NULL) {
 405                         unsigned int cchar;
 406
 407                         count = 160 - req->residual;
 408                         EBCASC(raw->inbuf, count);
 409                         cchar = ctrlchar_handle(raw->inbuf, count, tty);
 410                         switch (cchar & CTRLCHAR_MASK) {
 411                         case CTRLCHAR_SYSRQ:
 412                                 break;
 413
 414                         case CTRLCHAR_CTRL:
 415                                 tty_insert_flip_char(&raw->port, cchar,
 416                                                 TTY_NORMAL);
 417                                 tty_flip_buffer_push(&raw->port);
 418                                 break;
 419
 420                         case CTRLCHAR_NONE:
 421                                 if (count < 2 ||
 422                                     (strncmp(raw->inbuf+count-2, "\252n", 2) &&
 423                                      strncmp(raw->inbuf+count-2, "^n", 2)) ) {
 424                                         /* add the auto \n */
 425                                         raw->inbuf[count] = '\n';
 426                                         count++;
 427                                 } else
 428                                         count -= 2;
 429                                 tty_insert_flip_string(&raw->port, raw->inbuf,
 430                                                 count);
 431                                 tty_flip_buffer_push(&raw->port);
 432                                 break;
 433                         }
 434                 } else if (req->type == RAW3215_WRITE) {
 435                         raw->count -= req->len;
 436                         raw->written -= req->len;
 437                 }
 438                 raw->flags &= ~RAW3215_WORKING;
 439                 raw3215_free_req(req);
 440                 /* check for empty wait */
 441                 if (waitqueue_active(&raw->empty_wait) &&
 442                     raw->queued_write == NULL &&
 443                     raw->queued_read == NULL) {
 444                         wake_up_interruptible(&raw->empty_wait);
 445                 }
 446                 raw3215_next_io(raw, tty);
 447                 break;
 448         default:
 449                 /* Strange interrupt, I'll do my best to clean up */
 450                 if (req != NULL && req->type != RAW3215_FREE) {
 451                         if (req->type == RAW3215_WRITE) {
 452                                 raw->count -= req->len;
 453                                 raw->written -= req->len;
 454                         }
 455                         raw->flags &= ~RAW3215_WORKING;
 456                         raw3215_free_req(req);
 457                 }
 458                 raw3215_next_io(raw, tty);
 459         }
 460 put_tty:
 461         tty_kref_put(tty);
 462 }
 463
 464 /*
 465  * Drop the oldest line from the output buffer.
 466  */
 467 static void raw3215_drop_line(struct raw3215_info *raw)
 468 {
 469         int ix;
 470         char ch;
 471
 472         BUG_ON(raw->written != 0);
 473         ix = (raw->head - raw->count) & (RAW3215_BUFFER_SIZE - 1);
 474         while (raw->count > 0) {
 475                 ch = raw->buffer[ix];
 476                 ix = (ix + 1) & (RAW3215_BUFFER_SIZE - 1);
 477                 raw->count--;
 478                 if (ch == 0x15)
 479                         break;
 480         }
 481         raw->head = ix;
 482 }
 483
 484 /*
 485  * Wait until length bytes are available int the output buffer.
 486  * Has to be called with the s390irq lock held. Can be called
 487  * disabled.
 488  */
 489 static void raw3215_make_room(struct raw3215_info *raw, unsigned int length)
 490 {
 491         while (RAW3215_BUFFER_SIZE - raw->count < length) {
 492                 /* While console is frozen for suspend we have no other
 493                  * choice but to drop message from the buffer to make
 494                  * room for even more messages. */
 495                 if (raw->port.flags & ASYNC_SUSPENDED) {
 496                         raw3215_drop_line(raw);
 497                         continue;
 498                 }
 499                 /* there might be a request pending */
 500                 raw->flags |= RAW3215_FLUSHING;
 501                 raw3215_mk_write_req(raw);
 502                 raw3215_try_io(raw);
 503                 raw->flags &= ~RAW3215_FLUSHING;
 504 #ifdef CONFIG_TN3215_CONSOLE
 505                 ccw_device_wait_idle(raw->cdev);
 506 #endif
 507                 /* Enough room freed up ? */
 508                 if (RAW3215_BUFFER_SIZE - raw->count >= length)
 509                         break;
 510                 /* there might be another cpu waiting for the lock */
 511                 spin_unlock(get_ccwdev_lock(raw->cdev));
 512                 udelay(100);
 513                 spin_lock(get_ccwdev_lock(raw->cdev));
 514         }
 515 }
 516
 517 /*
 518  * String write routine for 3215 devices
 519  */
 520 static void raw3215_write(struct raw3215_info *raw, const char *str,
 521                           unsigned int length)
 522 {
 523         unsigned long flags;
 524         int c, count;
 525
 526         while (length > 0) {
 527                 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
 528                 count = (length > RAW3215_BUFFER_SIZE) ?
 529                                              RAW3215_BUFFER_SIZE : length;
 530                 length -= count;
 531
 532                 raw3215_make_room(raw, count);
 533
 534                 /* copy string to output buffer and convert it to EBCDIC */
 535                 while (1) {
 536                         c = min_t(int, count,
 537                                   min(RAW3215_BUFFER_SIZE - raw->count,
 538                                       RAW3215_BUFFER_SIZE - raw->head));
 539                         if (c <= 0)
 540                                 break;
 541                         memcpy(raw->buffer + raw->head, str, c);
 542                         ASCEBC(raw->buffer + raw->head, c);
 543                         raw->head = (raw->head + c) & (RAW3215_BUFFER_SIZE - 1);
 544                         raw->count += c;
 545                         raw->line_pos += c;
 546                         str += c;
 547                         count -= c;
 548                 }
 549                 if (!(raw->flags & RAW3215_WORKING)) {
 550                         raw3215_mk_write_req(raw);
 551                         /* start or queue request */
 552                         raw3215_try_io(raw);
 553                 }
 554                 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
 555         }
 556 }
 557
 558 /*
 559  * Put character routine for 3215 devices
 560  */
 561 static void raw3215_putchar(struct raw3215_info *raw, unsigned char ch)
 562 {
 563         unsigned long flags;
 564         unsigned int length, i;
 565
 566         spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
 567         if (ch == '\t') {
 568                 length = TAB_STOP_SIZE - (raw->line_pos%TAB_STOP_SIZE);
 569                 raw->line_pos += length;
 570                 ch = ' ';
 571         } else if (ch == '\n') {
 572                 length = 1;
 573                 raw->line_pos = 0;
 574         } else {
 575                 length = 1;
 576                 raw->line_pos++;
 577         }
 578         raw3215_make_room(raw, length);
 579
 580         for (i = 0; i < length; i++) {
 581                 raw->buffer[raw->head] = (char) _ascebc[(int) ch];
 582                 raw->head = (raw->head + 1) & (RAW3215_BUFFER_SIZE - 1);
 583                 raw->count++;
 584         }
 585         if (!(raw->flags & RAW3215_WORKING)) {
 586                 raw3215_mk_write_req(raw);
 587                 /* start or queue request */
 588                 raw3215_try_io(raw);
 589         }
 590         spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
 591 }
 592
 593 /*
 594  * Flush routine, it simply sets the flush flag and tries to start
 595  * pending IO.
 596  */
 597 static void raw3215_flush_buffer(struct raw3215_info *raw)
 598 {
 599         unsigned long flags;
 600
 601         spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
 602         if (raw->count > 0) {
 603                 raw->flags |= RAW3215_FLUSHING;
 604                 raw3215_try_io(raw);
 605                 raw->flags &= ~RAW3215_FLUSHING;
 606         }
 607         spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
 608 }
 609
 610 /*
 611  * Fire up a 3215 device.
 612  */
 613 static int raw3215_startup(struct raw3215_info *raw)
 614 {
 615         unsigned long flags;
 616
 617         if (raw->port.flags & ASYNC_INITIALIZED)
 618                 return 0;
 619         raw->line_pos = 0;
 620         raw->port.flags |= ASYNC_INITIALIZED;
 621         spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
 622         raw3215_try_io(raw);
 623         spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
 624
 625         return 0;
 626 }
 627
 628 /*
 629  * Shutdown a 3215 device.
 630  */
 631 static void raw3215_shutdown(struct raw3215_info *raw)
 632 {
 633         DECLARE_WAITQUEUE(wait, current);
 634         unsigned long flags;
 635
 636         if (!(raw->port.flags & ASYNC_INITIALIZED) ||
 637             (raw->flags & RAW3215_FIXED))
 638                 return;
 639         /* Wait for outstanding requests, then free irq */
 640         spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
 641         if ((raw->flags & RAW3215_WORKING) ||
 642             raw->queued_write != NULL ||
 643             raw->queued_read != NULL) {
 644                 raw->port.flags |= ASYNC_CLOSING;
 645                 add_wait_queue(&raw->empty_wait, &wait);
 646                 set_current_state(TASK_INTERRUPTIBLE);
 647                 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
 648                 schedule();
 649                 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
 650                 remove_wait_queue(&raw->empty_wait, &wait);
 651                 set_current_state(TASK_RUNNING);
 652                 raw->port.flags &= ~(ASYNC_INITIALIZED | ASYNC_CLOSING);
 653         }
 654         spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
 655 }
 656
 657 static struct raw3215_info *raw3215_alloc_info(void)
 658 {
 659         struct raw3215_info *info;
 660
 661         info = kzalloc(sizeof(struct raw3215_info), GFP_KERNEL | GFP_DMA);
 662         if (!info)
 663                 return NULL;
 664
 665         info->buffer = kzalloc(RAW3215_BUFFER_SIZE, GFP_KERNEL | GFP_DMA);
 666         info->inbuf = kzalloc(RAW3215_INBUF_SIZE, GFP_KERNEL | GFP_DMA);
 667         if (!info->buffer || !info->inbuf) {
 668                 kfree(info);
 669                 return NULL;
 670         }
 671
 672         setup_timer(&info->timer, raw3215_timeout, (unsigned long)info);
 673         init_waitqueue_head(&info->empty_wait);
 674         tasklet_init(&info->tlet, raw3215_wakeup, (unsigned long)info);
 675         tty_port_init(&info->port);
 676
 677         return info;
 678 }
 679
 680 static void raw3215_free_info(struct raw3215_info *raw)
 681 {
 682         kfree(raw->inbuf);
 683         kfree(raw->buffer);
 684         tty_port_destroy(&raw->port);
 685         kfree(raw);
 686 }
 687
 688 static int raw3215_probe (struct ccw_device *cdev)
 689 {
 690         struct raw3215_info *raw;
 691         int line;
 692
 693         /* Console is special. */
 694         if (raw3215[0] && (raw3215[0] == dev_get_drvdata(&cdev->dev)))
 695                 return 0;
 696
 697         raw = raw3215_alloc_info();
 698         if (raw == NULL)
 699                 return -ENOMEM;
 700
 701         raw->cdev = cdev;
 702         dev_set_drvdata(&cdev->dev, raw);
 703         cdev->handler = raw3215_irq;
 704
 705         spin_lock(&raw3215_device_lock);
 706         for (line = 0; line < NR_3215; line++) {
 707                 if (!raw3215[line]) {
 708                         raw3215[line] = raw;
 709                         break;
 710                 }
 711         }
 712         spin_unlock(&raw3215_device_lock);
 713         if (line == NR_3215) {
 714                 raw3215_free_info(raw);
 715                 return -ENODEV;
 716         }
 717
 718         return 0;
 719 }
 720
 721 static void raw3215_remove (struct ccw_device *cdev)
 722 {
 723         struct raw3215_info *raw;
 724         unsigned int line;
 725
 726         ccw_device_set_offline(cdev);
 727         raw = dev_get_drvdata(&cdev->dev);
 728         if (raw) {
 729                 spin_lock(&raw3215_device_lock);
 730                 for (line = 0; line < NR_3215; line++)
 731                         if (raw3215[line] == raw)
 732                                 break;
 733                 raw3215[line] = NULL;
 734                 spin_unlock(&raw3215_device_lock);
 735                 dev_set_drvdata(&cdev->dev, NULL);
 736                 raw3215_free_info(raw);
 737         }
 738 }
 739
 740 static int raw3215_set_online (struct ccw_device *cdev)
 741 {
 742         struct raw3215_info *raw;
 743
 744         raw = dev_get_drvdata(&cdev->dev);
 745         if (!raw)
 746                 return -ENODEV;
 747
 748         return raw3215_startup(raw);
 749 }
 750
 751 static int raw3215_set_offline (struct ccw_device *cdev)
 752 {
 753         struct raw3215_info *raw;
 754
 755         raw = dev_get_drvdata(&cdev->dev);
 756         if (!raw)
 757                 return -ENODEV;
 758
 759         raw3215_shutdown(raw);
 760
 761         return 0;
 762 }
 763
 764 static int raw3215_pm_stop(struct ccw_device *cdev)
 765 {
 766         struct raw3215_info *raw;
 767         unsigned long flags;
 768
 769         /* Empty the output buffer, then prevent new I/O. */
 770         raw = dev_get_drvdata(&cdev->dev);
 771         spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
 772         raw3215_make_room(raw, RAW3215_BUFFER_SIZE);
 773         raw->port.flags |= ASYNC_SUSPENDED;
 774         spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
 775         return 0;
 776 }
 777
 778 static int raw3215_pm_start(struct ccw_device *cdev)
 779 {
 780         struct raw3215_info *raw;
 781         unsigned long flags;
 782
 783         /* Allow I/O again and flush output buffer. */
 784         raw = dev_get_drvdata(&cdev->dev);
 785         spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
 786         raw->port.flags &= ~ASYNC_SUSPENDED;
 787         raw->flags |= RAW3215_FLUSHING;
 788         raw3215_try_io(raw);
 789         raw->flags &= ~RAW3215_FLUSHING;
 790         spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
 791         return 0;
 792 }
 793
 794 static struct ccw_device_id raw3215_id[] = {
 795         { CCW_DEVICE(0x3215, 0) },
 796         { /* end of list */ },
 797 };
 798
 799 static struct ccw_driver raw3215_ccw_driver = {
 800         .driver = {
 801                 .name   = "3215",
 802                 .owner  = THIS_MODULE,
 803         },
 804         .ids            = raw3215_id,
 805         .probe          = &raw3215_probe,
 806         .remove         = &raw3215_remove,
 807         .set_online     = &raw3215_set_online,
 808         .set_offline    = &raw3215_set_offline,
 809         .freeze         = &raw3215_pm_stop,
 810         .thaw           = &raw3215_pm_start,
 811         .restore        = &raw3215_pm_start,
 812         .int_class      = IRQIO_C15,
 813 };
 814
 815 #ifdef CONFIG_TN3215_CONSOLE
 816 /*
 817  * Write a string to the 3215 console
 818  */
 819 static void con3215_write(struct console *co, const char *str,
 820                           unsigned int count)
 821 {
 822         struct raw3215_info *raw;
 823         int i;
 824
 825         if (count <= 0)
 826                 return;
 827         raw = raw3215[0];       /* console 3215 is the first one */
 828         while (count > 0) {
 829                 for (i = 0; i < count; i++)
 830                         if (str[i] == '\t' || str[i] == '\n')
 831                                 break;
 832                 raw3215_write(raw, str, i);
 833                 count -= i;
 834                 str += i;
 835                 if (count > 0) {
 836                         raw3215_putchar(raw, *str);
 837                         count--;
 838                         str++;
 839                 }
 840         }
 841 }
 842
 843 static struct tty_driver *con3215_device(struct console *c, int *index)
 844 {
 845         *index = c->index;
 846         return tty3215_driver;
 847 }
 848
 849 /*
 850  * panic() calls con3215_flush through a panic_notifier
 851  * before the system enters a disabled, endless loop.
 852  */
 853 static void con3215_flush(void)
 854 {
 855         struct raw3215_info *raw;
 856         unsigned long flags;
 857
 858         raw = raw3215[0];  /* console 3215 is the first one */
 859         if (raw->port.flags & ASYNC_SUSPENDED)
 860                 /* The console is still frozen for suspend. */
 861                 if (ccw_device_force_console(raw->cdev))
 862                         /* Forcing didn't work, no panic message .. */
 863                         return;
 864         spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
 865         raw3215_make_room(raw, RAW3215_BUFFER_SIZE);
 866         spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
 867 }
 868
 869 static int con3215_notify(struct notifier_block *self,
 870                           unsigned long event, void *data)
 871 {
 872         con3215_flush();
 873         return NOTIFY_OK;
 874 }
 875
 876 static struct notifier_block on_panic_nb = {
 877         .notifier_call = con3215_notify,
 878         .priority = 0,
 879 };
 880
 881 static struct notifier_block on_reboot_nb = {
 882         .notifier_call = con3215_notify,
 883         .priority = 0,
 884 };
 885
 886 /*
 887  *  The console structure for the 3215 console
 888  */
 889 static struct console con3215 = {
 890         .name    = "ttyS",
 891         .write   = con3215_write,
 892         .device  = con3215_device,
 893         .flags   = CON_PRINTBUFFER,
 894 };
 895
 896 /*
 897  * 3215 console initialization code called from console_init().
 898  */
 899 static int __init con3215_init(void)
 900 {
 901         struct ccw_device *cdev;
 902         struct raw3215_info *raw;
 903         struct raw3215_req *req;
 904         int i;
 905
 906         /* Check if 3215 is to be the console */
 907         if (!CONSOLE_IS_3215)
 908                 return -ENODEV;
 909
 910         /* Set the console mode for VM */
 911         if (MACHINE_IS_VM) {
 912                 cpcmd("TERM CONMODE 3215", NULL, 0, NULL);
 913                 cpcmd("TERM AUTOCR OFF", NULL, 0, NULL);
 914         }
 915
 916         /* allocate 3215 request structures */
 917         raw3215_freelist = NULL;
 918         spin_lock_init(&raw3215_freelist_lock);
 919         for (i = 0; i < NR_3215_REQ; i++) {
 920                 req = kzalloc(sizeof(struct raw3215_req), GFP_KERNEL | GFP_DMA);
 921                 req->next = raw3215_freelist;
 922                 raw3215_freelist = req;
 923         }
 924
 925         cdev = ccw_device_create_console(&raw3215_ccw_driver);
 926         if (IS_ERR(cdev))
 927                 return -ENODEV;
 928
 929         raw3215[0] = raw = raw3215_alloc_info();
 930         raw->cdev = cdev;
 931         dev_set_drvdata(&cdev->dev, raw);
 932         cdev->handler = raw3215_irq;
 933
 934         raw->flags |= RAW3215_FIXED;
 935         if (ccw_device_enable_console(cdev)) {
 936                 ccw_device_destroy_console(cdev);
 937                 raw3215_free_info(raw);
 938                 raw3215[0] = NULL;
 939                 return -ENODEV;
 940         }
 941
 942         /* Request the console irq */
 943         if (raw3215_startup(raw) != 0) {
 944                 raw3215_free_info(raw);
 945                 raw3215[0] = NULL;
 946                 return -ENODEV;
 947         }
 948         atomic_notifier_chain_register(&panic_notifier_list, &on_panic_nb);
 949         register_reboot_notifier(&on_reboot_nb);
 950         register_console(&con3215);
 951         return 0;
 952 }
 953 console_initcall(con3215_init);
 954 #endif
 955
 956 static int tty3215_install(struct tty_driver *driver, struct tty_struct *tty)
 957 {
 958         struct raw3215_info *raw;
 959
 960         raw = raw3215[tty->index];
 961         if (raw == NULL)
 962                 return -ENODEV;
 963
 964         tty->driver_data = raw;
 965
 966         return tty_port_install(&raw->port, driver, tty);
 967 }
 968
 969 /*
 970  * tty3215_open
 971  *
 972  * This routine is called whenever a 3215 tty is opened.
 973  */
 974 static int tty3215_open(struct tty_struct *tty, struct file * filp)
 975 {
 976         struct raw3215_info *raw = tty->driver_data;
 977         int retval;
 978
 979         tty_port_tty_set(&raw->port, tty);
 980
 981         raw->port.low_latency = 0; /* don't use bottom half for pushing chars */
 982         /*
 983          * Start up 3215 device
 984          */
 985         retval = raw3215_startup(raw);
 986         if (retval)
 987                 return retval;
 988
 989         return 0;
 990 }
 991
 992 /*
 993  * tty3215_close()
 994  *
 995  * This routine is called when the 3215 tty is closed. We wait
 996  * for the remaining request to be completed. Then we clean up.
 997  */
 998 static void tty3215_close(struct tty_struct *tty, struct file * filp)
 999 {
1000         struct raw3215_info *raw;
1001
1002         raw = (struct raw3215_info *) tty->driver_data;
1003         if (raw == NULL || tty->count > 1)
1004                 return;
1005         tty->closing = 1;
1006         /* Shutdown the terminal */
1007         raw3215_shutdown(raw);
1008         tasklet_kill(&raw->tlet);
1009         tty->closing = 0;
1010         tty_port_tty_set(&raw->port, NULL);
1011 }
1012
1013 /*
1014  * Returns the amount of free space in the output buffer.
1015  */
1016 static int tty3215_write_room(struct tty_struct *tty)
1017 {
1018         struct raw3215_info *raw;
1019
1020         raw = (struct raw3215_info *) tty->driver_data;
1021
1022         /* Subtract TAB_STOP_SIZE to allow for a tab, 8 <<< 64K */
1023         if ((RAW3215_BUFFER_SIZE - raw->count - TAB_STOP_SIZE) >= 0)
1024                 return RAW3215_BUFFER_SIZE - raw->count - TAB_STOP_SIZE;
1025         else
1026                 return 0;
1027 }
1028
1029 /*
1030  * String write routine for 3215 ttys
1031  */
1032 static int tty3215_write(struct tty_struct * tty,
1033                          const unsigned char *buf, int count)
1034 {
1035         struct raw3215_info *raw;
1036
1037         if (!tty)
1038                 return 0;
1039         raw = (struct raw3215_info *) tty->driver_data;
1040         raw3215_write(raw, buf, count);
1041         return count;
1042 }
1043
1044 /*
1045  * Put character routine for 3215 ttys
1046  */
1047 static int tty3215_put_char(struct tty_struct *tty, unsigned char ch)
1048 {
1049         struct raw3215_info *raw;
1050
1051         if (!tty)
1052                 return 0;
1053         raw = (struct raw3215_info *) tty->driver_data;
1054         raw3215_putchar(raw, ch);
1055         return 1;
1056 }
1057
1058 static void tty3215_flush_chars(struct tty_struct *tty)
1059 {
1060 }
1061
1062 /*
1063  * Returns the number of characters in the output buffer
1064  */
1065 static int tty3215_chars_in_buffer(struct tty_struct *tty)
1066 {
1067         struct raw3215_info *raw;
1068
1069         raw = (struct raw3215_info *) tty->driver_data;
1070         return raw->count;
1071 }
1072
1073 static void tty3215_flush_buffer(struct tty_struct *tty)
1074 {
1075         struct raw3215_info *raw;
1076
1077         raw = (struct raw3215_info *) tty->driver_data;
1078         raw3215_flush_buffer(raw);
1079         tty_wakeup(tty);
1080 }
1081
1082 /*
1083  * Disable reading from a 3215 tty
1084  */
1085 static void tty3215_throttle(struct tty_struct * tty)
1086 {
1087         struct raw3215_info *raw;
1088
1089         raw = (struct raw3215_info *) tty->driver_data;
1090         raw->flags |= RAW3215_THROTTLED;
1091 }
1092
1093 /*
1094  * Enable reading from a 3215 tty
1095  */
1096 static void tty3215_unthrottle(struct tty_struct * tty)
1097 {
1098         struct raw3215_info *raw;
1099         unsigned long flags;
1100
1101         raw = (struct raw3215_info *) tty->driver_data;
1102         if (raw->flags & RAW3215_THROTTLED) {
1103                 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
1104                 raw->flags &= ~RAW3215_THROTTLED;
1105                 raw3215_try_io(raw);
1106                 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
1107         }
1108 }
1109
1110 /*
1111  * Disable writing to a 3215 tty
1112  */
1113 static void tty3215_stop(struct tty_struct *tty)
1114 {
1115         struct raw3215_info *raw;
1116
1117         raw = (struct raw3215_info *) tty->driver_data;
1118         raw->flags |= RAW3215_STOPPED;
1119 }
1120
1121 /*
1122  * Enable writing to a 3215 tty
1123  */
1124 static void tty3215_start(struct tty_struct *tty)
1125 {
1126         struct raw3215_info *raw;
1127         unsigned long flags;
1128
1129         raw = (struct raw3215_info *) tty->driver_data;
1130         if (raw->flags & RAW3215_STOPPED) {
1131                 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
1132                 raw->flags &= ~RAW3215_STOPPED;
1133                 raw3215_try_io(raw);
1134                 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
1135         }
1136 }
1137
1138 static const struct tty_operations tty3215_ops = {
1139         .install = tty3215_install,
1140         .open = tty3215_open,
1141         .close = tty3215_close,
1142         .write = tty3215_write,
1143         .put_char = tty3215_put_char,
1144         .flush_chars = tty3215_flush_chars,
1145         .write_room = tty3215_write_room,
1146         .chars_in_buffer = tty3215_chars_in_buffer,
1147         .flush_buffer = tty3215_flush_buffer,
1148         .throttle = tty3215_throttle,
1149         .unthrottle = tty3215_unthrottle,
1150         .stop = tty3215_stop,
1151         .start = tty3215_start,
1152 };
1153
1154 /*
1155  * 3215 tty registration code called from tty_init().
1156  * Most kernel services (incl. kmalloc) are available at this poimt.
1157  */
1158 static int __init tty3215_init(void)
1159 {
1160         struct tty_driver *driver;
1161         int ret;
1162
1163         if (!CONSOLE_IS_3215)
1164                 return 0;
1165
1166         driver = alloc_tty_driver(NR_3215);
1167         if (!driver)
1168                 return -ENOMEM;
1169
1170         ret = ccw_driver_register(&raw3215_ccw_driver);
1171         if (ret) {
1172                 put_tty_driver(driver);
1173                 return ret;
1174         }
1175         /*
1176          * Initialize the tty_driver structure
1177          * Entries in tty3215_driver that are NOT initialized:
1178          * proc_entry, set_termios, flush_buffer, set_ldisc, write_proc
1179          */
1180
1181         driver->driver_name = "tty3215";
1182         driver->name = "ttyS";
1183         driver->major = TTY_MAJOR;
1184         driver->minor_start = 64;
1185         driver->type = TTY_DRIVER_TYPE_SYSTEM;
1186         driver->subtype = SYSTEM_TYPE_TTY;
1187         driver->init_termios = tty_std_termios;
1188         driver->init_termios.c_iflag = IGNBRK | IGNPAR;
1189         driver->init_termios.c_oflag = ONLCR | XTABS;
1190         driver->init_termios.c_lflag = ISIG;
1191         driver->flags = TTY_DRIVER_REAL_RAW;
1192         tty_set_operations(driver, &tty3215_ops);
1193         ret = tty_register_driver(driver);
1194         if (ret) {
1195                 put_tty_driver(driver);
1196                 return ret;
1197         }
1198         tty3215_driver = driver;
1199         return 0;
1200 }
1201
1202 static void __exit tty3215_exit(void)
1203 {
1204         tty_unregister_driver(tty3215_driver);
1205         put_tty_driver(tty3215_driver);
1206         ccw_driver_unregister(&raw3215_ccw_driver);
1207 }
1208
1209 module_init(tty3215_init);
1210 module_exit(tty3215_exit);