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         raw->flags &= ~RAW3215_TIMER_RUNS;
 292         if (!(raw->port.flags & ASYNC_SUSPENDED)) {
 293                 raw3215_mk_write_req(raw);
 294                 raw3215_start_io(raw);
 295                 if ((raw->queued_read || raw->queued_write) &&
 296                     !(raw->flags & RAW3215_WORKING) &&
 297                     !(raw->flags & RAW3215_TIMER_RUNS)) {
 298                         raw->timer.expires = RAW3215_TIMEOUT + jiffies;
 299                         add_timer(&raw->timer);
 300                         raw->flags |= RAW3215_TIMER_RUNS;
 301                 }
 302         }
 303         spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
 304 }
 305
 306 /*
 307  * Function to conditionally start an IO. A read is started immediately,
 308  * a write is only started immediately if the flush flag is on or the
 309  * amount of data is bigger than RAW3215_MIN_WRITE. If a write is not
 310  * done immediately a timer is started with a delay of RAW3215_TIMEOUT.
 311  */
 312 static inline void raw3215_try_io(struct raw3215_info *raw)
 313 {
 314         if (!(raw->port.flags & ASYNC_INITIALIZED) ||
 315                         (raw->port.flags & ASYNC_SUSPENDED))
 316                 return;
 317         if (raw->queued_read != NULL)
 318                 raw3215_start_io(raw);
 319         else if (raw->queued_write != NULL) {
 320                 if ((raw->queued_write->delayable == 0) ||
 321                     (raw->flags & RAW3215_FLUSHING)) {
 322                         /* execute write requests bigger than minimum size */
 323                         raw3215_start_io(raw);
 324                 }
 325         }
 326         if ((raw->queued_read || raw->queued_write) &&
 327             !(raw->flags & RAW3215_WORKING) &&
 328             !(raw->flags & RAW3215_TIMER_RUNS)) {
 329                 raw->timer.expires = RAW3215_TIMEOUT + jiffies;
 330                 add_timer(&raw->timer);
 331                 raw->flags |= RAW3215_TIMER_RUNS;
 332         }
 333 }
 334
 335 /*
 336  * Call tty_wakeup from tasklet context
 337  */
 338 static void raw3215_wakeup(unsigned long data)
 339 {
 340         struct raw3215_info *raw = (struct raw3215_info *) data;
 341         struct tty_struct *tty;
 342
 343         tty = tty_port_tty_get(&raw->port);
 344         if (tty) {
 345                 tty_wakeup(tty);
 346                 tty_kref_put(tty);
 347         }
 348 }
 349
 350 /*
 351  * Try to start the next IO and wake up processes waiting on the tty.
 352  */
 353 static void raw3215_next_io(struct raw3215_info *raw, struct tty_struct *tty)
 354 {
 355         raw3215_mk_write_req(raw);
 356         raw3215_try_io(raw);
 357         if (tty && RAW3215_BUFFER_SIZE - raw->count >= RAW3215_MIN_SPACE)
 358                 tasklet_schedule(&raw->tlet);
 359 }
 360
 361 /*
 362  * Interrupt routine, called from common io layer
 363  */
 364 static void raw3215_irq(struct ccw_device *cdev, unsigned long intparm,
 365                         struct irb *irb)
 366 {
 367         struct raw3215_info *raw;
 368         struct raw3215_req *req;
 369         struct tty_struct *tty;
 370         int cstat, dstat;
 371         int count;
 372
 373         raw = dev_get_drvdata(&cdev->dev);
 374         req = (struct raw3215_req *) intparm;
 375         tty = tty_port_tty_get(&raw->port);
 376         cstat = irb->scsw.cmd.cstat;
 377         dstat = irb->scsw.cmd.dstat;
 378         if (cstat != 0)
 379                 raw3215_next_io(raw, tty);
 380         if (dstat & 0x01) { /* we got a unit exception */
 381                 dstat &= ~0x01;  /* we can ignore it */
 382         }
 383         switch (dstat) {
 384         case 0x80:
 385                 if (cstat != 0)
 386                         break;
 387                 /* Attention interrupt, someone hit the enter key */
 388                 raw3215_mk_read_req(raw);
 389                 raw3215_next_io(raw, tty);
 390                 break;
 391         case 0x08:
 392         case 0x0C:
 393                 /* Channel end interrupt. */
 394                 if ((raw = req->info) == NULL)
 395                         goto put_tty;        /* That shouldn't happen ... */
 396                 if (req->type == RAW3215_READ) {
 397                         /* store residual count, then wait for device end */
 398                         req->residual = irb->scsw.cmd.count;
 399                 }
 400                 if (dstat == 0x08)
 401                         break;
 402         case 0x04:
 403                 /* Device end interrupt. */
 404                 if ((raw = req->info) == NULL)
 405                         goto put_tty;        /* That shouldn't happen ... */
 406                 if (req->type == RAW3215_READ && tty != NULL) {
 407                         unsigned int cchar;
 408
 409                         count = 160 - req->residual;
 410                         EBCASC(raw->inbuf, count);
 411                         cchar = ctrlchar_handle(raw->inbuf, count, tty);
 412                         switch (cchar & CTRLCHAR_MASK) {
 413                         case CTRLCHAR_SYSRQ:
 414                                 break;
 415
 416                         case CTRLCHAR_CTRL:
 417                                 tty_insert_flip_char(&raw->port, cchar,
 418                                                 TTY_NORMAL);
 419                                 tty_flip_buffer_push(&raw->port);
 420                                 break;
 421
 422                         case CTRLCHAR_NONE:
 423                                 if (count < 2 ||
 424                                     (strncmp(raw->inbuf+count-2, "\252n", 2) &&
 425                                      strncmp(raw->inbuf+count-2, "^n", 2)) ) {
 426                                         /* add the auto \n */
 427                                         raw->inbuf[count] = '\n';
 428                                         count++;
 429                                 } else
 430                                         count -= 2;
 431                                 tty_insert_flip_string(&raw->port, raw->inbuf,
 432                                                 count);
 433                                 tty_flip_buffer_push(&raw->port);
 434                                 break;
 435                         }
 436                 } else if (req->type == RAW3215_WRITE) {
 437                         raw->count -= req->len;
 438                         raw->written -= req->len;
 439                 }
 440                 raw->flags &= ~RAW3215_WORKING;
 441                 raw3215_free_req(req);
 442                 /* check for empty wait */
 443                 if (waitqueue_active(&raw->empty_wait) &&
 444                     raw->queued_write == NULL &&
 445                     raw->queued_read == NULL) {
 446                         wake_up_interruptible(&raw->empty_wait);
 447                 }
 448                 raw3215_next_io(raw, tty);
 449                 break;
 450         default:
 451                 /* Strange interrupt, I'll do my best to clean up */
 452                 if (req != NULL && req->type != RAW3215_FREE) {
 453                         if (req->type == RAW3215_WRITE) {
 454                                 raw->count -= req->len;
 455                                 raw->written -= req->len;
 456                         }
 457                         raw->flags &= ~RAW3215_WORKING;
 458                         raw3215_free_req(req);
 459                 }
 460                 raw3215_next_io(raw, tty);
 461         }
 462 put_tty:
 463         tty_kref_put(tty);
 464 }
 465
 466 /*
 467  * Drop the oldest line from the output buffer.
 468  */
 469 static void raw3215_drop_line(struct raw3215_info *raw)
 470 {
 471         int ix;
 472         char ch;
 473
 474         BUG_ON(raw->written != 0);
 475         ix = (raw->head - raw->count) & (RAW3215_BUFFER_SIZE - 1);
 476         while (raw->count > 0) {
 477                 ch = raw->buffer[ix];
 478                 ix = (ix + 1) & (RAW3215_BUFFER_SIZE - 1);
 479                 raw->count--;
 480                 if (ch == 0x15)
 481                         break;
 482         }
 483         raw->head = ix;
 484 }
 485
 486 /*
 487  * Wait until length bytes are available int the output buffer.
 488  * Has to be called with the s390irq lock held. Can be called
 489  * disabled.
 490  */
 491 static void raw3215_make_room(struct raw3215_info *raw, unsigned int length)
 492 {
 493         while (RAW3215_BUFFER_SIZE - raw->count < length) {
 494                 /* While console is frozen for suspend we have no other
 495                  * choice but to drop message from the buffer to make
 496                  * room for even more messages. */
 497                 if (raw->port.flags & ASYNC_SUSPENDED) {
 498                         raw3215_drop_line(raw);
 499                         continue;
 500                 }
 501                 /* there might be a request pending */
 502                 raw->flags |= RAW3215_FLUSHING;
 503                 raw3215_mk_write_req(raw);
 504                 raw3215_try_io(raw);
 505                 raw->flags &= ~RAW3215_FLUSHING;
 506 #ifdef CONFIG_TN3215_CONSOLE
 507                 ccw_device_wait_idle(raw->cdev);
 508 #endif
 509                 /* Enough room freed up ? */
 510                 if (RAW3215_BUFFER_SIZE - raw->count >= length)
 511                         break;
 512                 /* there might be another cpu waiting for the lock */
 513                 spin_unlock(get_ccwdev_lock(raw->cdev));
 514                 udelay(100);
 515                 spin_lock(get_ccwdev_lock(raw->cdev));
 516         }
 517 }
 518
 519 /*
 520  * String write routine for 3215 devices
 521  */
 522 static void raw3215_write(struct raw3215_info *raw, const char *str,
 523                           unsigned int length)
 524 {
 525         unsigned long flags;
 526         int c, count;
 527
 528         while (length > 0) {
 529                 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
 530                 count = (length > RAW3215_BUFFER_SIZE) ?
 531                                              RAW3215_BUFFER_SIZE : length;
 532                 length -= count;
 533
 534                 raw3215_make_room(raw, count);
 535
 536                 /* copy string to output buffer and convert it to EBCDIC */
 537                 while (1) {
 538                         c = min_t(int, count,
 539                                   min(RAW3215_BUFFER_SIZE - raw->count,
 540                                       RAW3215_BUFFER_SIZE - raw->head));
 541                         if (c <= 0)
 542                                 break;
 543                         memcpy(raw->buffer + raw->head, str, c);
 544                         ASCEBC(raw->buffer + raw->head, c);
 545                         raw->head = (raw->head + c) & (RAW3215_BUFFER_SIZE - 1);
 546                         raw->count += c;
 547                         raw->line_pos += c;
 548                         str += c;
 549                         count -= c;
 550                 }
 551                 if (!(raw->flags & RAW3215_WORKING)) {
 552                         raw3215_mk_write_req(raw);
 553                         /* start or queue request */
 554                         raw3215_try_io(raw);
 555                 }
 556                 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
 557         }
 558 }
 559
 560 /*
 561  * Put character routine for 3215 devices
 562  */
 563 static void raw3215_putchar(struct raw3215_info *raw, unsigned char ch)
 564 {
 565         unsigned long flags;
 566         unsigned int length, i;
 567
 568         spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
 569         if (ch == '\t') {
 570                 length = TAB_STOP_SIZE - (raw->line_pos%TAB_STOP_SIZE);
 571                 raw->line_pos += length;
 572                 ch = ' ';
 573         } else if (ch == '\n') {
 574                 length = 1;
 575                 raw->line_pos = 0;
 576         } else {
 577                 length = 1;
 578                 raw->line_pos++;
 579         }
 580         raw3215_make_room(raw, length);
 581
 582         for (i = 0; i < length; i++) {
 583                 raw->buffer[raw->head] = (char) _ascebc[(int) ch];
 584                 raw->head = (raw->head + 1) & (RAW3215_BUFFER_SIZE - 1);
 585                 raw->count++;
 586         }
 587         if (!(raw->flags & RAW3215_WORKING)) {
 588                 raw3215_mk_write_req(raw);
 589                 /* start or queue request */
 590                 raw3215_try_io(raw);
 591         }
 592         spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
 593 }
 594
 595 /*
 596  * Flush routine, it simply sets the flush flag and tries to start
 597  * pending IO.
 598  */
 599 static void raw3215_flush_buffer(struct raw3215_info *raw)
 600 {
 601         unsigned long flags;
 602
 603         spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
 604         if (raw->count > 0) {
 605                 raw->flags |= RAW3215_FLUSHING;
 606                 raw3215_try_io(raw);
 607                 raw->flags &= ~RAW3215_FLUSHING;
 608         }
 609         spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
 610 }
 611
 612 /*
 613  * Fire up a 3215 device.
 614  */
 615 static int raw3215_startup(struct raw3215_info *raw)
 616 {
 617         unsigned long flags;
 618
 619         if (raw->port.flags & ASYNC_INITIALIZED)
 620                 return 0;
 621         raw->line_pos = 0;
 622         raw->port.flags |= ASYNC_INITIALIZED;
 623         spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
 624         raw3215_try_io(raw);
 625         spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
 626
 627         return 0;
 628 }
 629
 630 /*
 631  * Shutdown a 3215 device.
 632  */
 633 static void raw3215_shutdown(struct raw3215_info *raw)
 634 {
 635         DECLARE_WAITQUEUE(wait, current);
 636         unsigned long flags;
 637
 638         if (!(raw->port.flags & ASYNC_INITIALIZED) ||
 639             (raw->flags & RAW3215_FIXED))
 640                 return;
 641         /* Wait for outstanding requests, then free irq */
 642         spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
 643         if ((raw->flags & RAW3215_WORKING) ||
 644             raw->queued_write != NULL ||
 645             raw->queued_read != NULL) {
 646                 add_wait_queue(&raw->empty_wait, &wait);
 647                 set_current_state(TASK_INTERRUPTIBLE);
 648                 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
 649                 schedule();
 650                 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
 651                 remove_wait_queue(&raw->empty_wait, &wait);
 652                 set_current_state(TASK_RUNNING);
 653                 raw->port.flags &= ~ASYNC_INITIALIZED;
 654         }
 655         spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
 656 }
 657
 658 static struct raw3215_info *raw3215_alloc_info(void)
 659 {
 660         struct raw3215_info *info;
 661
 662         info = kzalloc(sizeof(struct raw3215_info), GFP_KERNEL | GFP_DMA);
 663         if (!info)
 664                 return NULL;
 665
 666         info->buffer = kzalloc(RAW3215_BUFFER_SIZE, GFP_KERNEL | GFP_DMA);
 667         info->inbuf = kzalloc(RAW3215_INBUF_SIZE, GFP_KERNEL | GFP_DMA);
 668         if (!info->buffer || !info->inbuf) {
 669                 kfree(info->inbuf);
 670                 kfree(info->buffer);
 671                 kfree(info);
 672                 return NULL;
 673         }
 674
 675         setup_timer(&info->timer, raw3215_timeout, (unsigned long)info);
 676         init_waitqueue_head(&info->empty_wait);
 677         tasklet_init(&info->tlet, raw3215_wakeup, (unsigned long)info);
 678         tty_port_init(&info->port);
 679
 680         return info;
 681 }
 682
 683 static void raw3215_free_info(struct raw3215_info *raw)
 684 {
 685         kfree(raw->inbuf);
 686         kfree(raw->buffer);
 687         tty_port_destroy(&raw->port);
 688         kfree(raw);
 689 }
 690
 691 static int raw3215_probe (struct ccw_device *cdev)
 692 {
 693         struct raw3215_info *raw;
 694         int line;
 695
 696         /* Console is special. */
 697         if (raw3215[0] && (raw3215[0] == dev_get_drvdata(&cdev->dev)))
 698                 return 0;
 699
 700         raw = raw3215_alloc_info();
 701         if (raw == NULL)
 702                 return -ENOMEM;
 703
 704         raw->cdev = cdev;
 705         dev_set_drvdata(&cdev->dev, raw);
 706         cdev->handler = raw3215_irq;
 707
 708         spin_lock(&raw3215_device_lock);
 709         for (line = 0; line < NR_3215; line++) {
 710                 if (!raw3215[line]) {
 711                         raw3215[line] = raw;
 712                         break;
 713                 }
 714         }
 715         spin_unlock(&raw3215_device_lock);
 716         if (line == NR_3215) {
 717                 raw3215_free_info(raw);
 718                 return -ENODEV;
 719         }
 720
 721         return 0;
 722 }
 723
 724 static void raw3215_remove (struct ccw_device *cdev)
 725 {
 726         struct raw3215_info *raw;
 727         unsigned int line;
 728
 729         ccw_device_set_offline(cdev);
 730         raw = dev_get_drvdata(&cdev->dev);
 731         if (raw) {
 732                 spin_lock(&raw3215_device_lock);
 733                 for (line = 0; line < NR_3215; line++)
 734                         if (raw3215[line] == raw)
 735                                 break;
 736                 raw3215[line] = NULL;
 737                 spin_unlock(&raw3215_device_lock);
 738                 dev_set_drvdata(&cdev->dev, NULL);
 739                 raw3215_free_info(raw);
 740         }
 741 }
 742
 743 static int raw3215_set_online (struct ccw_device *cdev)
 744 {
 745         struct raw3215_info *raw;
 746
 747         raw = dev_get_drvdata(&cdev->dev);
 748         if (!raw)
 749                 return -ENODEV;
 750
 751         return raw3215_startup(raw);
 752 }
 753
 754 static int raw3215_set_offline (struct ccw_device *cdev)
 755 {
 756         struct raw3215_info *raw;
 757
 758         raw = dev_get_drvdata(&cdev->dev);
 759         if (!raw)
 760                 return -ENODEV;
 761
 762         raw3215_shutdown(raw);
 763
 764         return 0;
 765 }
 766
 767 static int raw3215_pm_stop(struct ccw_device *cdev)
 768 {
 769         struct raw3215_info *raw;
 770         unsigned long flags;
 771
 772         /* Empty the output buffer, then prevent new I/O. */
 773         raw = dev_get_drvdata(&cdev->dev);
 774         spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
 775         raw3215_make_room(raw, RAW3215_BUFFER_SIZE);
 776         raw->port.flags |= ASYNC_SUSPENDED;
 777         spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
 778         return 0;
 779 }
 780
 781 static int raw3215_pm_start(struct ccw_device *cdev)
 782 {
 783         struct raw3215_info *raw;
 784         unsigned long flags;
 785
 786         /* Allow I/O again and flush output buffer. */
 787         raw = dev_get_drvdata(&cdev->dev);
 788         spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
 789         raw->port.flags &= ~ASYNC_SUSPENDED;
 790         raw->flags |= RAW3215_FLUSHING;
 791         raw3215_try_io(raw);
 792         raw->flags &= ~RAW3215_FLUSHING;
 793         spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
 794         return 0;
 795 }
 796
 797 static struct ccw_device_id raw3215_id[] = {
 798         { CCW_DEVICE(0x3215, 0) },
 799         { /* end of list */ },
 800 };
 801
 802 static struct ccw_driver raw3215_ccw_driver = {
 803         .driver = {
 804                 .name   = "3215",
 805                 .owner  = THIS_MODULE,
 806         },
 807         .ids            = raw3215_id,
 808         .probe          = &raw3215_probe,
 809         .remove         = &raw3215_remove,
 810         .set_online     = &raw3215_set_online,
 811         .set_offline    = &raw3215_set_offline,
 812         .freeze         = &raw3215_pm_stop,
 813         .thaw           = &raw3215_pm_start,
 814         .restore        = &raw3215_pm_start,
 815         .int_class      = IRQIO_C15,
 816 };
 817
 818 #ifdef CONFIG_TN3215_CONSOLE
 819 /*
 820  * Write a string to the 3215 console
 821  */
 822 static void con3215_write(struct console *co, const char *str,
 823                           unsigned int count)
 824 {
 825         struct raw3215_info *raw;
 826         int i;
 827
 828         if (count <= 0)
 829                 return;
 830         raw = raw3215[0];       /* console 3215 is the first one */
 831         while (count > 0) {
 832                 for (i = 0; i < count; i++)
 833                         if (str[i] == '\t' || str[i] == '\n')
 834                                 break;
 835                 raw3215_write(raw, str, i);
 836                 count -= i;
 837                 str += i;
 838                 if (count > 0) {
 839                         raw3215_putchar(raw, *str);
 840                         count--;
 841                         str++;
 842                 }
 843         }
 844 }
 845
 846 static struct tty_driver *con3215_device(struct console *c, int *index)
 847 {
 848         *index = c->index;
 849         return tty3215_driver;
 850 }
 851
 852 /*
 853  * panic() calls con3215_flush through a panic_notifier
 854  * before the system enters a disabled, endless loop.
 855  */
 856 static void con3215_flush(void)
 857 {
 858         struct raw3215_info *raw;
 859         unsigned long flags;
 860
 861         raw = raw3215[0];  /* console 3215 is the first one */
 862         if (raw->port.flags & ASYNC_SUSPENDED)
 863                 /* The console is still frozen for suspend. */
 864                 if (ccw_device_force_console(raw->cdev))
 865                         /* Forcing didn't work, no panic message .. */
 866                         return;
 867         spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
 868         raw3215_make_room(raw, RAW3215_BUFFER_SIZE);
 869         spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
 870 }
 871
 872 static int con3215_notify(struct notifier_block *self,
 873                           unsigned long event, void *data)
 874 {
 875         con3215_flush();
 876         return NOTIFY_OK;
 877 }
 878
 879 static struct notifier_block on_panic_nb = {
 880         .notifier_call = con3215_notify,
 881         .priority = 0,
 882 };
 883
 884 static struct notifier_block on_reboot_nb = {
 885         .notifier_call = con3215_notify,
 886         .priority = 0,
 887 };
 888
 889 /*
 890  *  The console structure for the 3215 console
 891  */
 892 static struct console con3215 = {
 893         .name    = "ttyS",
 894         .write   = con3215_write,
 895         .device  = con3215_device,
 896         .flags   = CON_PRINTBUFFER,
 897 };
 898
 899 /*
 900  * 3215 console initialization code called from console_init().
 901  */
 902 static int __init con3215_init(void)
 903 {
 904         struct ccw_device *cdev;
 905         struct raw3215_info *raw;
 906         struct raw3215_req *req;
 907         int i;
 908
 909         /* Check if 3215 is to be the console */
 910         if (!CONSOLE_IS_3215)
 911                 return -ENODEV;
 912
 913         /* Set the console mode for VM */
 914         if (MACHINE_IS_VM) {
 915                 cpcmd("TERM CONMODE 3215", NULL, 0, NULL);
 916                 cpcmd("TERM AUTOCR OFF", NULL, 0, NULL);
 917         }
 918
 919         /* allocate 3215 request structures */
 920         raw3215_freelist = NULL;
 921         spin_lock_init(&raw3215_freelist_lock);
 922         for (i = 0; i < NR_3215_REQ; i++) {
 923                 req = kzalloc(sizeof(struct raw3215_req), GFP_KERNEL | GFP_DMA);
 924                 if (!req)
 925                         return -ENOMEM;
 926                 req->next = raw3215_freelist;
 927                 raw3215_freelist = req;
 928         }
 929
 930         cdev = ccw_device_create_console(&raw3215_ccw_driver);
 931         if (IS_ERR(cdev))
 932                 return -ENODEV;
 933
 934         raw3215[0] = raw = raw3215_alloc_info();
 935         raw->cdev = cdev;
 936         dev_set_drvdata(&cdev->dev, raw);
 937         cdev->handler = raw3215_irq;
 938
 939         raw->flags |= RAW3215_FIXED;
 940         if (ccw_device_enable_console(cdev)) {
 941                 ccw_device_destroy_console(cdev);
 942                 raw3215_free_info(raw);
 943                 raw3215[0] = NULL;
 944                 return -ENODEV;
 945         }
 946
 947         /* Request the console irq */
 948         if (raw3215_startup(raw) != 0) {
 949                 raw3215_free_info(raw);
 950                 raw3215[0] = NULL;
 951                 return -ENODEV;
 952         }
 953         atomic_notifier_chain_register(&panic_notifier_list, &on_panic_nb);
 954         register_reboot_notifier(&on_reboot_nb);
 955         register_console(&con3215);
 956         return 0;
 957 }
 958 console_initcall(con3215_init);
 959 #endif
 960
 961 static int tty3215_install(struct tty_driver *driver, struct tty_struct *tty)
 962 {
 963         struct raw3215_info *raw;
 964
 965         raw = raw3215[tty->index];
 966         if (raw == NULL)
 967                 return -ENODEV;
 968
 969         tty->driver_data = raw;
 970
 971         return tty_port_install(&raw->port, driver, tty);
 972 }
 973
 974 /*
 975  * tty3215_open
 976  *
 977  * This routine is called whenever a 3215 tty is opened.
 978  */
 979 static int tty3215_open(struct tty_struct *tty, struct file * filp)
 980 {
 981         struct raw3215_info *raw = tty->driver_data;
 982         int retval;
 983
 984         tty_port_tty_set(&raw->port, tty);
 985
 986         raw->port.low_latency = 0; /* don't use bottom half for pushing chars */
 987         /*
 988          * Start up 3215 device
 989          */
 990         retval = raw3215_startup(raw);
 991         if (retval)
 992                 return retval;
 993
 994         return 0;
 995 }
 996
 997 /*
 998  * tty3215_close()
 999  *
1000  * This routine is called when the 3215 tty is closed. We wait
1001  * for the remaining request to be completed. Then we clean up.
1002  */
1003 static void tty3215_close(struct tty_struct *tty, struct file * filp)
1004 {
1005         struct raw3215_info *raw;
1006
1007         raw = (struct raw3215_info *) tty->driver_data;
1008         if (raw == NULL || tty->count > 1)
1009                 return;
1010         tty->closing = 1;
1011         /* Shutdown the terminal */
1012         raw3215_shutdown(raw);
1013         tasklet_kill(&raw->tlet);
1014         tty->closing = 0;
1015         tty_port_tty_set(&raw->port, NULL);
1016 }
1017
1018 /*
1019  * Returns the amount of free space in the output buffer.
1020  */
1021 static int tty3215_write_room(struct tty_struct *tty)
1022 {
1023         struct raw3215_info *raw;
1024
1025         raw = (struct raw3215_info *) tty->driver_data;
1026
1027         /* Subtract TAB_STOP_SIZE to allow for a tab, 8 <<< 64K */
1028         if ((RAW3215_BUFFER_SIZE - raw->count - TAB_STOP_SIZE) >= 0)
1029                 return RAW3215_BUFFER_SIZE - raw->count - TAB_STOP_SIZE;
1030         else
1031                 return 0;
1032 }
1033
1034 /*
1035  * String write routine for 3215 ttys
1036  */
1037 static int tty3215_write(struct tty_struct * tty,
1038                          const unsigned char *buf, int count)
1039 {
1040         struct raw3215_info *raw;
1041         int i, written;
1042
1043         if (!tty)
1044                 return 0;
1045         raw = (struct raw3215_info *) tty->driver_data;
1046         written = count;
1047         while (count > 0) {
1048                 for (i = 0; i < count; i++)
1049                         if (buf[i] == '\t' || buf[i] == '\n')
1050                                 break;
1051                 raw3215_write(raw, buf, i);
1052                 count -= i;
1053                 buf += i;
1054                 if (count > 0) {
1055                         raw3215_putchar(raw, *buf);
1056                         count--;
1057                         buf++;
1058                 }
1059         }
1060         return written;
1061 }
1062
1063 /*
1064  * Put character routine for 3215 ttys
1065  */
1066 static int tty3215_put_char(struct tty_struct *tty, unsigned char ch)
1067 {
1068         struct raw3215_info *raw;
1069
1070         if (!tty)
1071                 return 0;
1072         raw = (struct raw3215_info *) tty->driver_data;
1073         raw3215_putchar(raw, ch);
1074         return 1;
1075 }
1076
1077 static void tty3215_flush_chars(struct tty_struct *tty)
1078 {
1079 }
1080
1081 /*
1082  * Returns the number of characters in the output buffer
1083  */
1084 static int tty3215_chars_in_buffer(struct tty_struct *tty)
1085 {
1086         struct raw3215_info *raw;
1087
1088         raw = (struct raw3215_info *) tty->driver_data;
1089         return raw->count;
1090 }
1091
1092 static void tty3215_flush_buffer(struct tty_struct *tty)
1093 {
1094         struct raw3215_info *raw;
1095
1096         raw = (struct raw3215_info *) tty->driver_data;
1097         raw3215_flush_buffer(raw);
1098         tty_wakeup(tty);
1099 }
1100
1101 /*
1102  * Disable reading from a 3215 tty
1103  */
1104 static void tty3215_throttle(struct tty_struct * tty)
1105 {
1106         struct raw3215_info *raw;
1107
1108         raw = (struct raw3215_info *) tty->driver_data;
1109         raw->flags |= RAW3215_THROTTLED;
1110 }
1111
1112 /*
1113  * Enable reading from a 3215 tty
1114  */
1115 static void tty3215_unthrottle(struct tty_struct * tty)
1116 {
1117         struct raw3215_info *raw;
1118         unsigned long flags;
1119
1120         raw = (struct raw3215_info *) tty->driver_data;
1121         if (raw->flags & RAW3215_THROTTLED) {
1122                 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
1123                 raw->flags &= ~RAW3215_THROTTLED;
1124                 raw3215_try_io(raw);
1125                 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
1126         }
1127 }
1128
1129 /*
1130  * Disable writing to a 3215 tty
1131  */
1132 static void tty3215_stop(struct tty_struct *tty)
1133 {
1134         struct raw3215_info *raw;
1135
1136         raw = (struct raw3215_info *) tty->driver_data;
1137         raw->flags |= RAW3215_STOPPED;
1138 }
1139
1140 /*
1141  * Enable writing to a 3215 tty
1142  */
1143 static void tty3215_start(struct tty_struct *tty)
1144 {
1145         struct raw3215_info *raw;
1146         unsigned long flags;
1147
1148         raw = (struct raw3215_info *) tty->driver_data;
1149         if (raw->flags & RAW3215_STOPPED) {
1150                 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
1151                 raw->flags &= ~RAW3215_STOPPED;
1152                 raw3215_try_io(raw);
1153                 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
1154         }
1155 }
1156
1157 static const struct tty_operations tty3215_ops = {
1158         .install = tty3215_install,
1159         .open = tty3215_open,
1160         .close = tty3215_close,
1161         .write = tty3215_write,
1162         .put_char = tty3215_put_char,
1163         .flush_chars = tty3215_flush_chars,
1164         .write_room = tty3215_write_room,
1165         .chars_in_buffer = tty3215_chars_in_buffer,
1166         .flush_buffer = tty3215_flush_buffer,
1167         .throttle = tty3215_throttle,
1168         .unthrottle = tty3215_unthrottle,
1169         .stop = tty3215_stop,
1170         .start = tty3215_start,
1171 };
1172
1173 /*
1174  * 3215 tty registration code called from tty_init().
1175  * Most kernel services (incl. kmalloc) are available at this poimt.
1176  */
1177 static int __init tty3215_init(void)
1178 {
1179         struct tty_driver *driver;
1180         int ret;
1181
1182         if (!CONSOLE_IS_3215)
1183                 return 0;
1184
1185         driver = alloc_tty_driver(NR_3215);
1186         if (!driver)
1187                 return -ENOMEM;
1188
1189         ret = ccw_driver_register(&raw3215_ccw_driver);
1190         if (ret) {
1191                 put_tty_driver(driver);
1192                 return ret;
1193         }
1194         /*
1195          * Initialize the tty_driver structure
1196          * Entries in tty3215_driver that are NOT initialized:
1197          * proc_entry, set_termios, flush_buffer, set_ldisc, write_proc
1198          */
1199
1200         driver->driver_name = "tty3215";
1201         driver->name = "ttyS";
1202         driver->major = TTY_MAJOR;
1203         driver->minor_start = 64;
1204         driver->type = TTY_DRIVER_TYPE_SYSTEM;
1205         driver->subtype = SYSTEM_TYPE_TTY;
1206         driver->init_termios = tty_std_termios;
1207         driver->init_termios.c_iflag = IGNBRK | IGNPAR;
1208         driver->init_termios.c_oflag = ONLCR;
1209         driver->init_termios.c_lflag = ISIG;
1210         driver->flags = TTY_DRIVER_REAL_RAW;
1211         tty_set_operations(driver, &tty3215_ops);
1212         ret = tty_register_driver(driver);
1213         if (ret) {
1214                 put_tty_driver(driver);
1215                 return ret;
1216         }
1217         tty3215_driver = driver;
1218         return 0;
1219 }
1220
1221 static void __exit tty3215_exit(void)
1222 {
1223         tty_unregister_driver(tty3215_driver);
1224         put_tty_driver(tty3215_driver);
1225         ccw_driver_unregister(&raw3215_ccw_driver);
1226 }
1227
1228 module_init(tty3215_init);
1229 module_exit(tty3215_exit);