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         tty_wakeup(tty);
 343         tty_kref_put(tty);
 344 }
 345
 346 /*
 347  * Try to start the next IO and wake up processes waiting on the tty.
 348  */
 349 static void raw3215_next_io(struct raw3215_info *raw, struct tty_struct *tty)
 350 {
 351         raw3215_mk_write_req(raw);
 352         raw3215_try_io(raw);
 353         if (tty && RAW3215_BUFFER_SIZE - raw->count >= RAW3215_MIN_SPACE)
 354                 tasklet_schedule(&raw->tlet);
 355 }
 356
 357 /*
 358  * Interrupt routine, called from common io layer
 359  */
 360 static void raw3215_irq(struct ccw_device *cdev, unsigned long intparm,
 361                         struct irb *irb)
 362 {
 363         struct raw3215_info *raw;
 364         struct raw3215_req *req;
 365         struct tty_struct *tty;
 366         int cstat, dstat;
 367         int count;
 368
 369         raw = dev_get_drvdata(&cdev->dev);
 370         req = (struct raw3215_req *) intparm;
 371         tty = tty_port_tty_get(&raw->port);
 372         cstat = irb->scsw.cmd.cstat;
 373         dstat = irb->scsw.cmd.dstat;
 374         if (cstat != 0)
 375                 raw3215_next_io(raw, tty);
 376         if (dstat & 0x01) { /* we got a unit exception */
 377                 dstat &= ~0x01;  /* we can ignore it */
 378         }
 379         switch (dstat) {
 380         case 0x80:
 381                 if (cstat != 0)
 382                         break;
 383                 /* Attention interrupt, someone hit the enter key */
 384                 raw3215_mk_read_req(raw);
 385                 raw3215_next_io(raw, tty);
 386                 break;
 387         case 0x08:
 388         case 0x0C:
 389                 /* Channel end interrupt. */
 390                 if ((raw = req->info) == NULL)
 391                         goto put_tty;        /* That shouldn't happen ... */
 392                 if (req->type == RAW3215_READ) {
 393                         /* store residual count, then wait for device end */
 394                         req->residual = irb->scsw.cmd.count;
 395                 }
 396                 if (dstat == 0x08)
 397                         break;
 398         case 0x04:
 399                 /* Device end interrupt. */
 400                 if ((raw = req->info) == NULL)
 401                         goto put_tty;        /* That shouldn't happen ... */
 402                 if (req->type == RAW3215_READ && tty != NULL) {
 403                         unsigned int cchar;
 404
 405                         count = 160 - req->residual;
 406                         EBCASC(raw->inbuf, count);
 407                         cchar = ctrlchar_handle(raw->inbuf, count, tty);
 408                         switch (cchar & CTRLCHAR_MASK) {
 409                         case CTRLCHAR_SYSRQ:
 410                                 break;
 411
 412                         case CTRLCHAR_CTRL:
 413                                 tty_insert_flip_char(tty, cchar, TTY_NORMAL);
 414                                 tty_flip_buffer_push(tty);
 415                                 break;
 416
 417                         case CTRLCHAR_NONE:
 418                                 if (count < 2 ||
 419                                     (strncmp(raw->inbuf+count-2, "\252n", 2) &&
 420                                      strncmp(raw->inbuf+count-2, "^n", 2)) ) {
 421                                         /* add the auto \n */
 422                                         raw->inbuf[count] = '\n';
 423                                         count++;
 424                                 } else
 425                                         count -= 2;
 426                                 tty_insert_flip_string(tty, raw->inbuf, count);
 427                                 tty_flip_buffer_push(tty);
 428                                 break;
 429                         }
 430                 } else if (req->type == RAW3215_WRITE) {
 431                         raw->count -= req->len;
 432                         raw->written -= req->len;
 433                 }
 434                 raw->flags &= ~RAW3215_WORKING;
 435                 raw3215_free_req(req);
 436                 /* check for empty wait */
 437                 if (waitqueue_active(&raw->empty_wait) &&
 438                     raw->queued_write == NULL &&
 439                     raw->queued_read == NULL) {
 440                         wake_up_interruptible(&raw->empty_wait);
 441                 }
 442                 raw3215_next_io(raw, tty);
 443                 break;
 444         default:
 445                 /* Strange interrupt, I'll do my best to clean up */
 446                 if (req != NULL && req->type != RAW3215_FREE) {
 447                         if (req->type == RAW3215_WRITE) {
 448                                 raw->count -= req->len;
 449                                 raw->written -= req->len;
 450                         }
 451                         raw->flags &= ~RAW3215_WORKING;
 452                         raw3215_free_req(req);
 453                 }
 454                 raw3215_next_io(raw, tty);
 455         }
 456 put_tty:
 457         tty_kref_put(tty);
 458 }
 459
 460 /*
 461  * Drop the oldest line from the output buffer.
 462  */
 463 static void raw3215_drop_line(struct raw3215_info *raw)
 464 {
 465         int ix;
 466         char ch;
 467
 468         BUG_ON(raw->written != 0);
 469         ix = (raw->head - raw->count) & (RAW3215_BUFFER_SIZE - 1);
 470         while (raw->count > 0) {
 471                 ch = raw->buffer[ix];
 472                 ix = (ix + 1) & (RAW3215_BUFFER_SIZE - 1);
 473                 raw->count--;
 474                 if (ch == 0x15)
 475                         break;
 476         }
 477         raw->head = ix;
 478 }
 479
 480 /*
 481  * Wait until length bytes are available int the output buffer.
 482  * Has to be called with the s390irq lock held. Can be called
 483  * disabled.
 484  */
 485 static void raw3215_make_room(struct raw3215_info *raw, unsigned int length)
 486 {
 487         while (RAW3215_BUFFER_SIZE - raw->count < length) {
 488                 /* While console is frozen for suspend we have no other
 489                  * choice but to drop message from the buffer to make
 490                  * room for even more messages. */
 491                 if (raw->port.flags & ASYNC_SUSPENDED) {
 492                         raw3215_drop_line(raw);
 493                         continue;
 494                 }
 495                 /* there might be a request pending */
 496                 raw->flags |= RAW3215_FLUSHING;
 497                 raw3215_mk_write_req(raw);
 498                 raw3215_try_io(raw);
 499                 raw->flags &= ~RAW3215_FLUSHING;
 500 #ifdef CONFIG_TN3215_CONSOLE
 501                 wait_cons_dev();
 502 #endif
 503                 /* Enough room freed up ? */
 504                 if (RAW3215_BUFFER_SIZE - raw->count >= length)
 505                         break;
 506                 /* there might be another cpu waiting for the lock */
 507                 spin_unlock(get_ccwdev_lock(raw->cdev));
 508                 udelay(100);
 509                 spin_lock(get_ccwdev_lock(raw->cdev));
 510         }
 511 }
 512
 513 /*
 514  * String write routine for 3215 devices
 515  */
 516 static void raw3215_write(struct raw3215_info *raw, const char *str,
 517                           unsigned int length)
 518 {
 519         unsigned long flags;
 520         int c, count;
 521
 522         while (length > 0) {
 523                 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
 524                 count = (length > RAW3215_BUFFER_SIZE) ?
 525                                              RAW3215_BUFFER_SIZE : length;
 526                 length -= count;
 527
 528                 raw3215_make_room(raw, count);
 529
 530                 /* copy string to output buffer and convert it to EBCDIC */
 531                 while (1) {
 532                         c = min_t(int, count,
 533                                   min(RAW3215_BUFFER_SIZE - raw->count,
 534                                       RAW3215_BUFFER_SIZE - raw->head));
 535                         if (c <= 0)
 536                                 break;
 537                         memcpy(raw->buffer + raw->head, str, c);
 538                         ASCEBC(raw->buffer + raw->head, c);
 539                         raw->head = (raw->head + c) & (RAW3215_BUFFER_SIZE - 1);
 540                         raw->count += c;
 541                         raw->line_pos += c;
 542                         str += c;
 543                         count -= c;
 544                 }
 545                 if (!(raw->flags & RAW3215_WORKING)) {
 546                         raw3215_mk_write_req(raw);
 547                         /* start or queue request */
 548                         raw3215_try_io(raw);
 549                 }
 550                 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
 551         }
 552 }
 553
 554 /*
 555  * Put character routine for 3215 devices
 556  */
 557 static void raw3215_putchar(struct raw3215_info *raw, unsigned char ch)
 558 {
 559         unsigned long flags;
 560         unsigned int length, i;
 561
 562         spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
 563         if (ch == '\t') {
 564                 length = TAB_STOP_SIZE - (raw->line_pos%TAB_STOP_SIZE);
 565                 raw->line_pos += length;
 566                 ch = ' ';
 567         } else if (ch == '\n') {
 568                 length = 1;
 569                 raw->line_pos = 0;
 570         } else {
 571                 length = 1;
 572                 raw->line_pos++;
 573         }
 574         raw3215_make_room(raw, length);
 575
 576         for (i = 0; i < length; i++) {
 577                 raw->buffer[raw->head] = (char) _ascebc[(int) ch];
 578                 raw->head = (raw->head + 1) & (RAW3215_BUFFER_SIZE - 1);
 579                 raw->count++;
 580         }
 581         if (!(raw->flags & RAW3215_WORKING)) {
 582                 raw3215_mk_write_req(raw);
 583                 /* start or queue request */
 584                 raw3215_try_io(raw);
 585         }
 586         spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
 587 }
 588
 589 /*
 590  * Flush routine, it simply sets the flush flag and tries to start
 591  * pending IO.
 592  */
 593 static void raw3215_flush_buffer(struct raw3215_info *raw)
 594 {
 595         unsigned long flags;
 596
 597         spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
 598         if (raw->count > 0) {
 599                 raw->flags |= RAW3215_FLUSHING;
 600                 raw3215_try_io(raw);
 601                 raw->flags &= ~RAW3215_FLUSHING;
 602         }
 603         spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
 604 }
 605
 606 /*
 607  * Fire up a 3215 device.
 608  */
 609 static int raw3215_startup(struct raw3215_info *raw)
 610 {
 611         unsigned long flags;
 612
 613         if (raw->port.flags & ASYNC_INITIALIZED)
 614                 return 0;
 615         raw->line_pos = 0;
 616         raw->port.flags |= ASYNC_INITIALIZED;
 617         spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
 618         raw3215_try_io(raw);
 619         spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
 620
 621         return 0;
 622 }
 623
 624 /*
 625  * Shutdown a 3215 device.
 626  */
 627 static void raw3215_shutdown(struct raw3215_info *raw)
 628 {
 629         DECLARE_WAITQUEUE(wait, current);
 630         unsigned long flags;
 631
 632         if (!(raw->port.flags & ASYNC_INITIALIZED) ||
 633                         (raw->flags & RAW3215_FIXED))
 634                 return;
 635         /* Wait for outstanding requests, then free irq */
 636         spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
 637         if ((raw->flags & RAW3215_WORKING) ||
 638             raw->queued_write != NULL ||
 639             raw->queued_read != NULL) {
 640                 raw->port.flags |= ASYNC_CLOSING;
 641                 add_wait_queue(&raw->empty_wait, &wait);
 642                 set_current_state(TASK_INTERRUPTIBLE);
 643                 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
 644                 schedule();
 645                 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
 646                 remove_wait_queue(&raw->empty_wait, &wait);
 647                 set_current_state(TASK_RUNNING);
 648                 raw->port.flags &= ~(ASYNC_INITIALIZED | ASYNC_CLOSING);
 649         }
 650         spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
 651 }
 652
 653 static struct raw3215_info *raw3215_alloc_info(void)
 654 {
 655         struct raw3215_info *info;
 656
 657         info = kzalloc(sizeof(struct raw3215_info), GFP_KERNEL | GFP_DMA);
 658         if (!info)
 659                 return NULL;
 660
 661         info->buffer = kzalloc(RAW3215_BUFFER_SIZE, GFP_KERNEL | GFP_DMA);
 662         info->inbuf = kzalloc(RAW3215_INBUF_SIZE, GFP_KERNEL | GFP_DMA);
 663         if (!info->buffer || !info->inbuf) {
 664                 kfree(info);
 665                 return NULL;
 666         }
 667
 668         setup_timer(&info->timer, raw3215_timeout, (unsigned long)info);
 669         init_waitqueue_head(&info->empty_wait);
 670         tasklet_init(&info->tlet, raw3215_wakeup, (unsigned long)info);
 671         tty_port_init(&info->port);
 672
 673         return info;
 674 }
 675
 676 static void raw3215_free_info(struct raw3215_info *raw)
 677 {
 678         kfree(raw->inbuf);
 679         kfree(raw->buffer);
 680         kfree(raw);
 681 }
 682
 683 static int raw3215_probe (struct ccw_device *cdev)
 684 {
 685         struct raw3215_info *raw;
 686         int line;
 687
 688         /* Console is special. */
 689         if (raw3215[0] && (raw3215[0] == dev_get_drvdata(&cdev->dev)))
 690                 return 0;
 691
 692         raw = raw3215_alloc_info();
 693         if (raw == NULL)
 694                 return -ENOMEM;
 695
 696         raw->cdev = cdev;
 697         dev_set_drvdata(&cdev->dev, raw);
 698         cdev->handler = raw3215_irq;
 699
 700         spin_lock(&raw3215_device_lock);
 701         for (line = 0; line < NR_3215; line++) {
 702                 if (!raw3215[line]) {
 703                         raw3215[line] = raw;
 704                         break;
 705                 }
 706         }
 707         spin_unlock(&raw3215_device_lock);
 708         if (line == NR_3215) {
 709                 raw3215_free_info(raw);
 710                 return -ENODEV;
 711         }
 712
 713         return 0;
 714 }
 715
 716 static void raw3215_remove (struct ccw_device *cdev)
 717 {
 718         struct raw3215_info *raw;
 719         unsigned int line;
 720
 721         ccw_device_set_offline(cdev);
 722         raw = dev_get_drvdata(&cdev->dev);
 723         if (raw) {
 724                 spin_lock(&raw3215_device_lock);
 725                 for (line = 0; line < NR_3215; line++)
 726                         if (raw3215[line] == raw)
 727                                 break;
 728                 raw3215[line] = NULL;
 729                 spin_unlock(&raw3215_device_lock);
 730                 dev_set_drvdata(&cdev->dev, NULL);
 731                 raw3215_free_info(raw);
 732         }
 733 }
 734
 735 static int raw3215_set_online (struct ccw_device *cdev)
 736 {
 737         struct raw3215_info *raw;
 738
 739         raw = dev_get_drvdata(&cdev->dev);
 740         if (!raw)
 741                 return -ENODEV;
 742
 743         return raw3215_startup(raw);
 744 }
 745
 746 static int raw3215_set_offline (struct ccw_device *cdev)
 747 {
 748         struct raw3215_info *raw;
 749
 750         raw = dev_get_drvdata(&cdev->dev);
 751         if (!raw)
 752                 return -ENODEV;
 753
 754         raw3215_shutdown(raw);
 755
 756         return 0;
 757 }
 758
 759 static int raw3215_pm_stop(struct ccw_device *cdev)
 760 {
 761         struct raw3215_info *raw;
 762         unsigned long flags;
 763
 764         /* Empty the output buffer, then prevent new I/O. */
 765         raw = dev_get_drvdata(&cdev->dev);
 766         spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
 767         raw3215_make_room(raw, RAW3215_BUFFER_SIZE);
 768         raw->port.flags |= ASYNC_SUSPENDED;
 769         spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
 770         return 0;
 771 }
 772
 773 static int raw3215_pm_start(struct ccw_device *cdev)
 774 {
 775         struct raw3215_info *raw;
 776         unsigned long flags;
 777
 778         /* Allow I/O again and flush output buffer. */
 779         raw = dev_get_drvdata(&cdev->dev);
 780         spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
 781         raw->port.flags &= ~ASYNC_SUSPENDED;
 782         raw->flags |= RAW3215_FLUSHING;
 783         raw3215_try_io(raw);
 784         raw->flags &= ~RAW3215_FLUSHING;
 785         spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
 786         return 0;
 787 }
 788
 789 static struct ccw_device_id raw3215_id[] = {
 790         { CCW_DEVICE(0x3215, 0) },
 791         { /* end of list */ },
 792 };
 793
 794 static struct ccw_driver raw3215_ccw_driver = {
 795         .driver = {
 796                 .name   = "3215",
 797                 .owner  = THIS_MODULE,
 798         },
 799         .ids            = raw3215_id,
 800         .probe          = &raw3215_probe,
 801         .remove         = &raw3215_remove,
 802         .set_online     = &raw3215_set_online,
 803         .set_offline    = &raw3215_set_offline,
 804         .freeze         = &raw3215_pm_stop,
 805         .thaw           = &raw3215_pm_start,
 806         .restore        = &raw3215_pm_start,
 807         .int_class      = IOINT_C15,
 808 };
 809
 810 #ifdef CONFIG_TN3215_CONSOLE
 811 /*
 812  * Write a string to the 3215 console
 813  */
 814 static void con3215_write(struct console *co, const char *str,
 815                           unsigned int count)
 816 {
 817         struct raw3215_info *raw;
 818         int i;
 819
 820         if (count <= 0)
 821                 return;
 822         raw = raw3215[0];       /* console 3215 is the first one */
 823         while (count > 0) {
 824                 for (i = 0; i < count; i++)
 825                         if (str[i] == '\t' || str[i] == '\n')
 826                                 break;
 827                 raw3215_write(raw, str, i);
 828                 count -= i;
 829                 str += i;
 830                 if (count > 0) {
 831                         raw3215_putchar(raw, *str);
 832                         count--;
 833                         str++;
 834                 }
 835         }
 836 }
 837
 838 static struct tty_driver *con3215_device(struct console *c, int *index)
 839 {
 840         *index = c->index;
 841         return tty3215_driver;
 842 }
 843
 844 /*
 845  * panic() calls con3215_flush through a panic_notifier
 846  * before the system enters a disabled, endless loop.
 847  */
 848 static void con3215_flush(void)
 849 {
 850         struct raw3215_info *raw;
 851         unsigned long flags;
 852
 853         raw = raw3215[0];  /* console 3215 is the first one */
 854         if (raw->port.flags & ASYNC_SUSPENDED)
 855                 /* The console is still frozen for suspend. */
 856                 if (ccw_device_force_console())
 857                         /* Forcing didn't work, no panic message .. */
 858                         return;
 859         spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
 860         raw3215_make_room(raw, RAW3215_BUFFER_SIZE);
 861         spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
 862 }
 863
 864 static int con3215_notify(struct notifier_block *self,
 865                           unsigned long event, void *data)
 866 {
 867         con3215_flush();
 868         return NOTIFY_OK;
 869 }
 870
 871 static struct notifier_block on_panic_nb = {
 872         .notifier_call = con3215_notify,
 873         .priority = 0,
 874 };
 875
 876 static struct notifier_block on_reboot_nb = {
 877         .notifier_call = con3215_notify,
 878         .priority = 0,
 879 };
 880
 881 /*
 882  *  The console structure for the 3215 console
 883  */
 884 static struct console con3215 = {
 885         .name    = "ttyS",
 886         .write   = con3215_write,
 887         .device  = con3215_device,
 888         .flags   = CON_PRINTBUFFER,
 889 };
 890
 891 /*
 892  * 3215 console initialization code called from console_init().
 893  */
 894 static int __init con3215_init(void)
 895 {
 896         struct ccw_device *cdev;
 897         struct raw3215_info *raw;
 898         struct raw3215_req *req;
 899         int i;
 900
 901         /* Check if 3215 is to be the console */
 902         if (!CONSOLE_IS_3215)
 903                 return -ENODEV;
 904
 905         /* Set the console mode for VM */
 906         if (MACHINE_IS_VM) {
 907                 cpcmd("TERM CONMODE 3215", NULL, 0, NULL);
 908                 cpcmd("TERM AUTOCR OFF", NULL, 0, NULL);
 909         }
 910
 911         /* allocate 3215 request structures */
 912         raw3215_freelist = NULL;
 913         spin_lock_init(&raw3215_freelist_lock);
 914         for (i = 0; i < NR_3215_REQ; i++) {
 915                 req = kzalloc(sizeof(struct raw3215_req), GFP_KERNEL | GFP_DMA);
 916                 req->next = raw3215_freelist;
 917                 raw3215_freelist = req;
 918         }
 919
 920         cdev = ccw_device_probe_console();
 921         if (IS_ERR(cdev))
 922                 return -ENODEV;
 923
 924         raw3215[0] = raw = raw3215_alloc_info();
 925         raw->cdev = cdev;
 926         dev_set_drvdata(&cdev->dev, raw);
 927         cdev->handler = raw3215_irq;
 928
 929         raw->flags |= RAW3215_FIXED;
 930
 931         /* Request the console irq */
 932         if (raw3215_startup(raw) != 0) {
 933                 raw3215_free_info(raw);
 934                 raw3215[0] = NULL;
 935                 return -ENODEV;
 936         }
 937         atomic_notifier_chain_register(&panic_notifier_list, &on_panic_nb);
 938         register_reboot_notifier(&on_reboot_nb);
 939         register_console(&con3215);
 940         return 0;
 941 }
 942 console_initcall(con3215_init);
 943 #endif
 944
 945 static int tty3215_install(struct tty_driver *driver, struct tty_struct *tty)
 946 {
 947         struct raw3215_info *raw;
 948
 949         raw = raw3215[tty->index];
 950         if (raw == NULL)
 951                 return -ENODEV;
 952
 953         tty->driver_data = raw;
 954
 955         return tty_port_install(&raw->port, driver, tty);
 956 }
 957
 958 /*
 959  * tty3215_open
 960  *
 961  * This routine is called whenever a 3215 tty is opened.
 962  */
 963 static int tty3215_open(struct tty_struct *tty, struct file * filp)
 964 {
 965         struct raw3215_info *raw = tty->driver_data;
 966         int retval;
 967
 968         tty_port_tty_set(&raw->port, tty);
 969
 970         tty->low_latency = 0;  /* don't use bottom half for pushing chars */
 971         /*
 972          * Start up 3215 device
 973          */
 974         retval = raw3215_startup(raw);
 975         if (retval)
 976                 return retval;
 977
 978         return 0;
 979 }
 980
 981 /*
 982  * tty3215_close()
 983  *
 984  * This routine is called when the 3215 tty is closed. We wait
 985  * for the remaining request to be completed. Then we clean up.
 986  */
 987 static void tty3215_close(struct tty_struct *tty, struct file * filp)
 988 {
 989         struct raw3215_info *raw;
 990
 991         raw = (struct raw3215_info *) tty->driver_data;
 992         if (raw == NULL || tty->count > 1)
 993                 return;
 994         tty->closing = 1;
 995         /* Shutdown the terminal */
 996         raw3215_shutdown(raw);
 997         tasklet_kill(&raw->tlet);
 998         tty->closing = 0;
 999         tty_port_tty_set(&raw->port, NULL);
1000 }
1001
1002 /*
1003  * Returns the amount of free space in the output buffer.
1004  */
1005 static int tty3215_write_room(struct tty_struct *tty)
1006 {
1007         struct raw3215_info *raw;
1008
1009         raw = (struct raw3215_info *) tty->driver_data;
1010
1011         /* Subtract TAB_STOP_SIZE to allow for a tab, 8 <<< 64K */
1012         if ((RAW3215_BUFFER_SIZE - raw->count - TAB_STOP_SIZE) >= 0)
1013                 return RAW3215_BUFFER_SIZE - raw->count - TAB_STOP_SIZE;
1014         else
1015                 return 0;
1016 }
1017
1018 /*
1019  * String write routine for 3215 ttys
1020  */
1021 static int tty3215_write(struct tty_struct * tty,
1022                          const unsigned char *buf, int count)
1023 {
1024         struct raw3215_info *raw;
1025
1026         if (!tty)
1027                 return 0;
1028         raw = (struct raw3215_info *) tty->driver_data;
1029         raw3215_write(raw, buf, count);
1030         return count;
1031 }
1032
1033 /*
1034  * Put character routine for 3215 ttys
1035  */
1036 static int tty3215_put_char(struct tty_struct *tty, unsigned char ch)
1037 {
1038         struct raw3215_info *raw;
1039
1040         if (!tty)
1041                 return 0;
1042         raw = (struct raw3215_info *) tty->driver_data;
1043         raw3215_putchar(raw, ch);
1044         return 1;
1045 }
1046
1047 static void tty3215_flush_chars(struct tty_struct *tty)
1048 {
1049 }
1050
1051 /*
1052  * Returns the number of characters in the output buffer
1053  */
1054 static int tty3215_chars_in_buffer(struct tty_struct *tty)
1055 {
1056         struct raw3215_info *raw;
1057
1058         raw = (struct raw3215_info *) tty->driver_data;
1059         return raw->count;
1060 }
1061
1062 static void tty3215_flush_buffer(struct tty_struct *tty)
1063 {
1064         struct raw3215_info *raw;
1065
1066         raw = (struct raw3215_info *) tty->driver_data;
1067         raw3215_flush_buffer(raw);
1068         tty_wakeup(tty);
1069 }
1070
1071 /*
1072  * Disable reading from a 3215 tty
1073  */
1074 static void tty3215_throttle(struct tty_struct * tty)
1075 {
1076         struct raw3215_info *raw;
1077
1078         raw = (struct raw3215_info *) tty->driver_data;
1079         raw->flags |= RAW3215_THROTTLED;
1080 }
1081
1082 /*
1083  * Enable reading from a 3215 tty
1084  */
1085 static void tty3215_unthrottle(struct tty_struct * tty)
1086 {
1087         struct raw3215_info *raw;
1088         unsigned long flags;
1089
1090         raw = (struct raw3215_info *) tty->driver_data;
1091         if (raw->flags & RAW3215_THROTTLED) {
1092                 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
1093                 raw->flags &= ~RAW3215_THROTTLED;
1094                 raw3215_try_io(raw);
1095                 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
1096         }
1097 }
1098
1099 /*
1100  * Disable writing to a 3215 tty
1101  */
1102 static void tty3215_stop(struct tty_struct *tty)
1103 {
1104         struct raw3215_info *raw;
1105
1106         raw = (struct raw3215_info *) tty->driver_data;
1107         raw->flags |= RAW3215_STOPPED;
1108 }
1109
1110 /*
1111  * Enable writing to a 3215 tty
1112  */
1113 static void tty3215_start(struct tty_struct *tty)
1114 {
1115         struct raw3215_info *raw;
1116         unsigned long flags;
1117
1118         raw = (struct raw3215_info *) tty->driver_data;
1119         if (raw->flags & RAW3215_STOPPED) {
1120                 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
1121                 raw->flags &= ~RAW3215_STOPPED;
1122                 raw3215_try_io(raw);
1123                 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
1124         }
1125 }
1126
1127 static const struct tty_operations tty3215_ops = {
1128         .install = tty3215_install,
1129         .open = tty3215_open,
1130         .close = tty3215_close,
1131         .write = tty3215_write,
1132         .put_char = tty3215_put_char,
1133         .flush_chars = tty3215_flush_chars,
1134         .write_room = tty3215_write_room,
1135         .chars_in_buffer = tty3215_chars_in_buffer,
1136         .flush_buffer = tty3215_flush_buffer,
1137         .throttle = tty3215_throttle,
1138         .unthrottle = tty3215_unthrottle,
1139         .stop = tty3215_stop,
1140         .start = tty3215_start,
1141 };
1142
1143 /*
1144  * 3215 tty registration code called from tty_init().
1145  * Most kernel services (incl. kmalloc) are available at this poimt.
1146  */
1147 static int __init tty3215_init(void)
1148 {
1149         struct tty_driver *driver;
1150         int ret;
1151
1152         if (!CONSOLE_IS_3215)
1153                 return 0;
1154
1155         driver = alloc_tty_driver(NR_3215);
1156         if (!driver)
1157                 return -ENOMEM;
1158
1159         ret = ccw_driver_register(&raw3215_ccw_driver);
1160         if (ret) {
1161                 put_tty_driver(driver);
1162                 return ret;
1163         }
1164         /*
1165          * Initialize the tty_driver structure
1166          * Entries in tty3215_driver that are NOT initialized:
1167          * proc_entry, set_termios, flush_buffer, set_ldisc, write_proc
1168          */
1169
1170         driver->driver_name = "tty3215";
1171         driver->name = "ttyS";
1172         driver->major = TTY_MAJOR;
1173         driver->minor_start = 64;
1174         driver->type = TTY_DRIVER_TYPE_SYSTEM;
1175         driver->subtype = SYSTEM_TYPE_TTY;
1176         driver->init_termios = tty_std_termios;
1177         driver->init_termios.c_iflag = IGNBRK | IGNPAR;
1178         driver->init_termios.c_oflag = ONLCR | XTABS;
1179         driver->init_termios.c_lflag = ISIG;
1180         driver->flags = TTY_DRIVER_REAL_RAW;
1181         tty_set_operations(driver, &tty3215_ops);
1182         ret = tty_register_driver(driver);
1183         if (ret) {
1184                 put_tty_driver(driver);
1185                 return ret;
1186         }
1187         tty3215_driver = driver;
1188         return 0;
1189 }
1190
1191 static void __exit tty3215_exit(void)
1192 {
1193         tty_unregister_driver(tty3215_driver);
1194         put_tty_driver(tty3215_driver);
1195         ccw_driver_unregister(&raw3215_ccw_driver);
1196 }
1197
1198 module_init(tty3215_init);
1199 module_exit(tty3215_exit);