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_WORKING     4         /* set if a request is being worked on */
  48 #define RAW3215_THROTTLED   8         /* set if reading is disabled */
  49 #define RAW3215_STOPPED     16        /* set if writing is disabled */
  50 #define RAW3215_TIMER_RUNS  64        /* set if the output delay timer is on */
  51 #define RAW3215_FLUSHING    128       /* set to flush buffer (no delay) */
  52
  53 #define TAB_STOP_SIZE       8         /* tab stop size */
  54
  55 /*
  56  * Request types for a 3215 device
  57  */
  58 enum raw3215_type {
  59         RAW3215_FREE, RAW3215_READ, RAW3215_WRITE
  60 };
  61
  62 /*
  63  * Request structure for a 3215 device
  64  */
  65 struct raw3215_req {
  66         enum raw3215_type type;       /* type of the request */
  67         int start, len;               /* start index & len in output buffer */
  68         int delayable;                /* indication to wait for more data */
  69         int residual;                 /* residual count for read request */
  70         struct ccw1 ccws[RAW3215_NR_CCWS]; /* space for the channel program */
  71         struct raw3215_info *info;    /* pointer to main structure */
  72         struct raw3215_req *next;     /* pointer to next request */
  73 } __attribute__ ((aligned(8)));
  74
  75 struct raw3215_info {
  76         struct tty_port port;
  77         struct ccw_device *cdev;      /* device for tty driver */
  78         spinlock_t *lock;             /* pointer to irq lock */
  79         int flags;                    /* state flags */
  80         char *buffer;                 /* pointer to output buffer */
  81         char *inbuf;                  /* pointer to input buffer */
  82         int head;                     /* first free byte in output buffer */
  83         int count;                    /* number of bytes in output buffer */
  84         int written;                  /* number of bytes in write requests */
  85         struct raw3215_req *queued_read; /* pointer to queued read requests */
  86         struct raw3215_req *queued_write;/* pointer to queued write requests */
  87         struct tasklet_struct tlet;   /* tasklet to invoke tty_wakeup */
  88         wait_queue_head_t empty_wait; /* wait queue for flushing */
  89         struct timer_list timer;      /* timer for delayed output */
  90         int line_pos;                 /* position on the line (for tabs) */
  91         char ubuffer[80];             /* copy_from_user buffer */
  92 };
  93
  94 /* array of 3215 devices structures */
  95 static struct raw3215_info *raw3215[NR_3215];
  96 /* spinlock to protect the raw3215 array */
  97 static DEFINE_SPINLOCK(raw3215_device_lock);
  98 /* list of free request structures */
  99 static struct raw3215_req *raw3215_freelist;
 100 /* spinlock to protect free list */
 101 static spinlock_t raw3215_freelist_lock;
 102
 103 static struct tty_driver *tty3215_driver;
 104
 105 /*
 106  * Get a request structure from the free list
 107  */
 108 static inline struct raw3215_req *raw3215_alloc_req(void)
 109 {
 110         struct raw3215_req *req;
 111         unsigned long flags;
 112
 113         spin_lock_irqsave(&raw3215_freelist_lock, flags);
 114         req = raw3215_freelist;
 115         raw3215_freelist = req->next;
 116         spin_unlock_irqrestore(&raw3215_freelist_lock, flags);
 117         return req;
 118 }
 119
 120 /*
 121  * Put a request structure back to the free list
 122  */
 123 static inline void raw3215_free_req(struct raw3215_req *req)
 124 {
 125         unsigned long flags;
 126
 127         if (req->type == RAW3215_FREE)
 128                 return;         /* don't free a free request */
 129         req->type = RAW3215_FREE;
 130         spin_lock_irqsave(&raw3215_freelist_lock, flags);
 131         req->next = raw3215_freelist;
 132         raw3215_freelist = req;
 133         spin_unlock_irqrestore(&raw3215_freelist_lock, flags);
 134 }
 135
 136 /*
 137  * Set up a read request that reads up to 160 byte from the 3215 device.
 138  * If there is a queued read request it is used, but that shouldn't happen
 139  * because a 3215 terminal won't accept a new read before the old one is
 140  * completed.
 141  */
 142 static void raw3215_mk_read_req(struct raw3215_info *raw)
 143 {
 144         struct raw3215_req *req;
 145         struct ccw1 *ccw;
 146
 147         /* there can only be ONE read request at a time */
 148         req = raw->queued_read;
 149         if (req == NULL) {
 150                 /* no queued read request, use new req structure */
 151                 req = raw3215_alloc_req();
 152                 req->type = RAW3215_READ;
 153                 req->info = raw;
 154                 raw->queued_read = req;
 155         }
 156
 157         ccw = req->ccws;
 158         ccw->cmd_code = 0x0A; /* read inquiry */
 159         ccw->flags = 0x20;    /* ignore incorrect length */
 160         ccw->count = 160;
 161         ccw->cda = (__u32) __pa(raw->inbuf);
 162 }
 163
 164 /*
 165  * Set up a write request with the information from the main structure.
 166  * A ccw chain is created that writes as much as possible from the output
 167  * buffer to the 3215 device. If a queued write exists it is replaced by
 168  * the new, probably lengthened request.
 169  */
 170 static void raw3215_mk_write_req(struct raw3215_info *raw)
 171 {
 172         struct raw3215_req *req;
 173         struct ccw1 *ccw;
 174         int len, count, ix, lines;
 175
 176         if (raw->count <= raw->written)
 177                 return;
 178         /* check if there is a queued write request */
 179         req = raw->queued_write;
 180         if (req == NULL) {
 181                 /* no queued write request, use new req structure */
 182                 req = raw3215_alloc_req();
 183                 req->type = RAW3215_WRITE;
 184                 req->info = raw;
 185                 raw->queued_write = req;
 186         } else {
 187                 raw->written -= req->len;
 188         }
 189
 190         ccw = req->ccws;
 191         req->start = (raw->head - raw->count + raw->written) &
 192                      (RAW3215_BUFFER_SIZE - 1);
 193         /*
 194          * now we have to count newlines. We can at max accept
 195          * RAW3215_MAX_NEWLINE newlines in a single ssch due to
 196          * a restriction in VM
 197          */
 198         lines = 0;
 199         ix = req->start;
 200         while (lines < RAW3215_MAX_NEWLINE && ix != raw->head) {
 201                 if (raw->buffer[ix] == 0x15)
 202                         lines++;
 203                 ix = (ix + 1) & (RAW3215_BUFFER_SIZE - 1);
 204         }
 205         len = ((ix - 1 - req->start) & (RAW3215_BUFFER_SIZE - 1)) + 1;
 206         if (len > RAW3215_MAX_BYTES)
 207                 len = RAW3215_MAX_BYTES;
 208         req->len = len;
 209         raw->written += len;
 210
 211         /* set the indication if we should try to enlarge this request */
 212         req->delayable = (ix == raw->head) && (len < RAW3215_MIN_WRITE);
 213
 214         ix = req->start;
 215         while (len > 0) {
 216                 if (ccw > req->ccws)
 217                         ccw[-1].flags |= 0x40; /* use command chaining */
 218                 ccw->cmd_code = 0x01; /* write, auto carrier return */
 219                 ccw->flags = 0x20;    /* ignore incorrect length ind.  */
 220                 ccw->cda =
 221                         (__u32) __pa(raw->buffer + ix);
 222                 count = len;
 223                 if (ix + count > RAW3215_BUFFER_SIZE)
 224                         count = RAW3215_BUFFER_SIZE - ix;
 225                 ccw->count = count;
 226                 len -= count;
 227                 ix = (ix + count) & (RAW3215_BUFFER_SIZE - 1);
 228                 ccw++;
 229         }
 230         /*
 231          * Add a NOP to the channel program. 3215 devices are purely
 232          * emulated and its much better to avoid the channel end
 233          * interrupt in this case.
 234          */
 235         if (ccw > req->ccws)
 236                 ccw[-1].flags |= 0x40; /* use command chaining */
 237         ccw->cmd_code = 0x03; /* NOP */
 238         ccw->flags = 0;
 239         ccw->cda = 0;
 240         ccw->count = 1;
 241 }
 242
 243 /*
 244  * Start a read or a write request
 245  */
 246 static void raw3215_start_io(struct raw3215_info *raw)
 247 {
 248         struct raw3215_req *req;
 249         int res;
 250
 251         req = raw->queued_read;
 252         if (req != NULL &&
 253             !(raw->flags & (RAW3215_WORKING | RAW3215_THROTTLED))) {
 254                 /* dequeue request */
 255                 raw->queued_read = NULL;
 256                 res = ccw_device_start(raw->cdev, req->ccws,
 257                                        (unsigned long) req, 0, 0);
 258                 if (res != 0) {
 259                         /* do_IO failed, put request back to queue */
 260                         raw->queued_read = req;
 261                 } else {
 262                         raw->flags |= RAW3215_WORKING;
 263                 }
 264         }
 265         req = raw->queued_write;
 266         if (req != NULL &&
 267             !(raw->flags & (RAW3215_WORKING | RAW3215_STOPPED))) {
 268                 /* dequeue request */
 269                 raw->queued_write = NULL;
 270                 res = ccw_device_start(raw->cdev, req->ccws,
 271                                        (unsigned long) req, 0, 0);
 272                 if (res != 0) {
 273                         /* do_IO failed, put request back to queue */
 274                         raw->queued_write = req;
 275                 } else {
 276                         raw->flags |= RAW3215_WORKING;
 277                 }
 278         }
 279 }
 280
 281 /*
 282  * Function to start a delayed output after RAW3215_TIMEOUT seconds
 283  */
 284 static void raw3215_timeout(unsigned long __data)
 285 {
 286         struct raw3215_info *raw = (struct raw3215_info *) __data;
 287         unsigned long flags;
 288
 289         spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
 290         if (raw->flags & RAW3215_TIMER_RUNS) {
 291                 del_timer(&raw->timer);
 292                 raw->flags &= ~RAW3215_TIMER_RUNS;
 293                 if (!(raw->port.flags & ASYNC_SUSPENDED)) {
 294                         raw3215_mk_write_req(raw);
 295                         raw3215_start_io(raw);
 296                 }
 297         }
 298         spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
 299 }
 300
 301 /*
 302  * Function to conditionally start an IO. A read is started immediately,
 303  * a write is only started immediately if the flush flag is on or the
 304  * amount of data is bigger than RAW3215_MIN_WRITE. If a write is not
 305  * done immediately a timer is started with a delay of RAW3215_TIMEOUT.
 306  */
 307 static inline void raw3215_try_io(struct raw3215_info *raw)
 308 {
 309         if (!(raw->port.flags & ASYNC_INITIALIZED) ||
 310                         (raw->port.flags & ASYNC_SUSPENDED))
 311                 return;
 312         if (raw->queued_read != NULL)
 313                 raw3215_start_io(raw);
 314         else if (raw->queued_write != NULL) {
 315                 if ((raw->queued_write->delayable == 0) ||
 316                     (raw->flags & RAW3215_FLUSHING)) {
 317                         /* execute write requests bigger than minimum size */
 318                         raw3215_start_io(raw);
 319                         if (raw->flags & RAW3215_TIMER_RUNS) {
 320                                 del_timer(&raw->timer);
 321                                 raw->flags &= ~RAW3215_TIMER_RUNS;
 322                         }
 323                 } else if (!(raw->flags & RAW3215_TIMER_RUNS)) {
 324                         /* delay small writes */
 325                         raw->timer.expires = RAW3215_TIMEOUT + jiffies;
 326                         add_timer(&raw->timer);
 327                         raw->flags |= RAW3215_TIMER_RUNS;
 328                 }
 329         }
 330 }
 331
 332 /*
 333  * Call tty_wakeup from tasklet context
 334  */
 335 static void raw3215_wakeup(unsigned long data)
 336 {
 337         struct raw3215_info *raw = (struct raw3215_info *) data;
 338         struct tty_struct *tty;
 339
 340         tty = tty_port_tty_get(&raw->port);
 341         if (tty) {
 342                 tty_wakeup(tty);
 343                 tty_kref_put(tty);
 344         }
 345 }
 346
 347 /*
 348  * Try to start the next IO and wake up processes waiting on the tty.
 349  */
 350 static void raw3215_next_io(struct raw3215_info *raw, struct tty_struct *tty)
 351 {
 352         raw3215_mk_write_req(raw);
 353         raw3215_try_io(raw);
 354         if (tty && RAW3215_BUFFER_SIZE - raw->count >= RAW3215_MIN_SPACE)
 355                 tasklet_schedule(&raw->tlet);
 356 }
 357
 358 /*
 359  * Interrupt routine, called from common io layer
 360  */
 361 static void raw3215_irq(struct ccw_device *cdev, unsigned long intparm,
 362                         struct irb *irb)
 363 {
 364         struct raw3215_info *raw;
 365         struct raw3215_req *req;
 366         struct tty_struct *tty;
 367         int cstat, dstat;
 368         int count;
 369
 370         raw = dev_get_drvdata(&cdev->dev);
 371         req = (struct raw3215_req *) intparm;
 372         tty = tty_port_tty_get(&raw->port);
 373         cstat = irb->scsw.cmd.cstat;
 374         dstat = irb->scsw.cmd.dstat;
 375         if (cstat != 0)
 376                 raw3215_next_io(raw, tty);
 377         if (dstat & 0x01) { /* we got a unit exception */
 378                 dstat &= ~0x01;  /* we can ignore it */
 379         }
 380         switch (dstat) {
 381         case 0x80:
 382                 if (cstat != 0)
 383                         break;
 384                 /* Attention interrupt, someone hit the enter key */
 385                 raw3215_mk_read_req(raw);
 386                 raw3215_next_io(raw, tty);
 387                 break;
 388         case 0x08:
 389         case 0x0C:
 390                 /* Channel end interrupt. */
 391                 if ((raw = req->info) == NULL)
 392                         goto put_tty;        /* That shouldn't happen ... */
 393                 if (req->type == RAW3215_READ) {
 394                         /* store residual count, then wait for device end */
 395                         req->residual = irb->scsw.cmd.count;
 396                 }
 397                 if (dstat == 0x08)
 398                         break;
 399         case 0x04:
 400                 /* Device end interrupt. */
 401                 if ((raw = req->info) == NULL)
 402                         goto put_tty;        /* That shouldn't happen ... */
 403                 if (req->type == RAW3215_READ && tty != NULL) {
 404                         unsigned int cchar;
 405
 406                         count = 160 - req->residual;
 407                         EBCASC(raw->inbuf, count);
 408                         cchar = ctrlchar_handle(raw->inbuf, count, tty);
 409                         switch (cchar & CTRLCHAR_MASK) {
 410                         case CTRLCHAR_SYSRQ:
 411                                 break;
 412
 413                         case CTRLCHAR_CTRL:
 414                                 tty_insert_flip_char(tty, cchar, TTY_NORMAL);
 415                                 tty_flip_buffer_push(tty);
 416                                 break;
 417
 418                         case CTRLCHAR_NONE:
 419                                 if (count < 2 ||
 420                                     (strncmp(raw->inbuf+count-2, "\252n", 2) &&
 421                                      strncmp(raw->inbuf+count-2, "^n", 2)) ) {
 422                                         /* add the auto \n */
 423                                         raw->inbuf[count] = '\n';
 424                                         count++;
 425                                 } else
 426                                         count -= 2;
 427                                 tty_insert_flip_string(tty, raw->inbuf, count);
 428                                 tty_flip_buffer_push(tty);
 429                                 break;
 430                         }
 431                 } else if (req->type == RAW3215_WRITE) {
 432                         raw->count -= req->len;
 433                         raw->written -= req->len;
 434                 }
 435                 raw->flags &= ~RAW3215_WORKING;
 436                 raw3215_free_req(req);
 437                 /* check for empty wait */
 438                 if (waitqueue_active(&raw->empty_wait) &&
 439                     raw->queued_write == NULL &&
 440                     raw->queued_read == NULL) {
 441                         wake_up_interruptible(&raw->empty_wait);
 442                 }
 443                 raw3215_next_io(raw, tty);
 444                 break;
 445         default:
 446                 /* Strange interrupt, I'll do my best to clean up */
 447                 if (req != NULL && req->type != RAW3215_FREE) {
 448                         if (req->type == RAW3215_WRITE) {
 449                                 raw->count -= req->len;
 450                                 raw->written -= req->len;
 451                         }
 452                         raw->flags &= ~RAW3215_WORKING;
 453                         raw3215_free_req(req);
 454                 }
 455                 raw3215_next_io(raw, tty);
 456         }
 457 put_tty:
 458         tty_kref_put(tty);
 459 }
 460
 461 /*
 462  * Drop the oldest line from the output buffer.
 463  */
 464 static void raw3215_drop_line(struct raw3215_info *raw)
 465 {
 466         int ix;
 467         char ch;
 468
 469         BUG_ON(raw->written != 0);
 470         ix = (raw->head - raw->count) & (RAW3215_BUFFER_SIZE - 1);
 471         while (raw->count > 0) {
 472                 ch = raw->buffer[ix];
 473                 ix = (ix + 1) & (RAW3215_BUFFER_SIZE - 1);
 474                 raw->count--;
 475                 if (ch == 0x15)
 476                         break;
 477         }
 478         raw->head = ix;
 479 }
 480
 481 /*
 482  * Wait until length bytes are available int the output buffer.
 483  * Has to be called with the s390irq lock held. Can be called
 484  * disabled.
 485  */
 486 static void raw3215_make_room(struct raw3215_info *raw, unsigned int length)
 487 {
 488         while (RAW3215_BUFFER_SIZE - raw->count < length) {
 489                 /* While console is frozen for suspend we have no other
 490                  * choice but to drop message from the buffer to make
 491                  * room for even more messages. */
 492                 if (raw->port.flags & ASYNC_SUSPENDED) {
 493                         raw3215_drop_line(raw);
 494                         continue;
 495                 }
 496                 /* there might be a request pending */
 497                 raw->flags |= RAW3215_FLUSHING;
 498                 raw3215_mk_write_req(raw);
 499                 raw3215_try_io(raw);
 500                 raw->flags &= ~RAW3215_FLUSHING;
 501 #ifdef CONFIG_TN3215_CONSOLE
 502                 wait_cons_dev();
 503 #endif
 504                 /* Enough room freed up ? */
 505                 if (RAW3215_BUFFER_SIZE - raw->count >= length)
 506                         break;
 507                 /* there might be another cpu waiting for the lock */
 508                 spin_unlock(get_ccwdev_lock(raw->cdev));
 509                 udelay(100);
 510                 spin_lock(get_ccwdev_lock(raw->cdev));
 511         }
 512 }
 513
 514 /*
 515  * String write routine for 3215 devices
 516  */
 517 static void raw3215_write(struct raw3215_info *raw, const char *str,
 518                           unsigned int length)
 519 {
 520         unsigned long flags;
 521         int c, count;
 522
 523         while (length > 0) {
 524                 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
 525                 count = (length > RAW3215_BUFFER_SIZE) ?
 526                                              RAW3215_BUFFER_SIZE : length;
 527                 length -= count;
 528
 529                 raw3215_make_room(raw, count);
 530
 531                 /* copy string to output buffer and convert it to EBCDIC */
 532                 while (1) {
 533                         c = min_t(int, count,
 534                                   min(RAW3215_BUFFER_SIZE - raw->count,
 535                                       RAW3215_BUFFER_SIZE - raw->head));
 536                         if (c <= 0)
 537                                 break;
 538                         memcpy(raw->buffer + raw->head, str, c);
 539                         ASCEBC(raw->buffer + raw->head, c);
 540                         raw->head = (raw->head + c) & (RAW3215_BUFFER_SIZE - 1);
 541                         raw->count += c;
 542                         raw->line_pos += c;
 543                         str += c;
 544                         count -= c;
 545                 }
 546                 if (!(raw->flags & RAW3215_WORKING)) {
 547                         raw3215_mk_write_req(raw);
 548                         /* start or queue request */
 549                         raw3215_try_io(raw);
 550                 }
 551                 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
 552         }
 553 }
 554
 555 /*
 556  * Put character routine for 3215 devices
 557  */
 558 static void raw3215_putchar(struct raw3215_info *raw, unsigned char ch)
 559 {
 560         unsigned long flags;
 561         unsigned int length, i;
 562
 563         spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
 564         if (ch == '\t') {
 565                 length = TAB_STOP_SIZE - (raw->line_pos%TAB_STOP_SIZE);
 566                 raw->line_pos += length;
 567                 ch = ' ';
 568         } else if (ch == '\n') {
 569                 length = 1;
 570                 raw->line_pos = 0;
 571         } else {
 572                 length = 1;
 573                 raw->line_pos++;
 574         }
 575         raw3215_make_room(raw, length);
 576
 577         for (i = 0; i < length; i++) {
 578                 raw->buffer[raw->head] = (char) _ascebc[(int) ch];
 579                 raw->head = (raw->head + 1) & (RAW3215_BUFFER_SIZE - 1);
 580                 raw->count++;
 581         }
 582         if (!(raw->flags & RAW3215_WORKING)) {
 583                 raw3215_mk_write_req(raw);
 584                 /* start or queue request */
 585                 raw3215_try_io(raw);
 586         }
 587         spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
 588 }
 589
 590 /*
 591  * Flush routine, it simply sets the flush flag and tries to start
 592  * pending IO.
 593  */
 594 static void raw3215_flush_buffer(struct raw3215_info *raw)
 595 {
 596         unsigned long flags;
 597
 598         spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
 599         if (raw->count > 0) {
 600                 raw->flags |= RAW3215_FLUSHING;
 601                 raw3215_try_io(raw);
 602                 raw->flags &= ~RAW3215_FLUSHING;
 603         }
 604         spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
 605 }
 606
 607 /*
 608  * Fire up a 3215 device.
 609  */
 610 static int raw3215_startup(struct raw3215_info *raw)
 611 {
 612         unsigned long flags;
 613
 614         if (raw->port.flags & ASYNC_INITIALIZED)
 615                 return 0;
 616         raw->line_pos = 0;
 617         raw->port.flags |= ASYNC_INITIALIZED;
 618         spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
 619         raw3215_try_io(raw);
 620         spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
 621
 622         return 0;
 623 }
 624
 625 /*
 626  * Shutdown a 3215 device.
 627  */
 628 static void raw3215_shutdown(struct raw3215_info *raw)
 629 {
 630         DECLARE_WAITQUEUE(wait, current);
 631         unsigned long flags;
 632
 633         if (!(raw->port.flags & ASYNC_INITIALIZED))
 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         tty_port_destroy(&raw->port);
 681         kfree(raw);
 682 }
 683
 684 static int raw3215_probe (struct ccw_device *cdev)
 685 {
 686         struct raw3215_info *raw;
 687         int line;
 688
 689         /* Console is special. */
 690         if (raw3215[0] && (raw3215[0] == dev_get_drvdata(&cdev->dev)))
 691                 return 0;
 692
 693         raw = raw3215_alloc_info();
 694         if (raw == NULL)
 695                 return -ENOMEM;
 696
 697         raw->cdev = cdev;
 698         dev_set_drvdata(&cdev->dev, raw);
 699         cdev->handler = raw3215_irq;
 700
 701         spin_lock(&raw3215_device_lock);
 702         for (line = 0; line < NR_3215; line++) {
 703                 if (!raw3215[line]) {
 704                         raw3215[line] = raw;
 705                         break;
 706                 }
 707         }
 708         spin_unlock(&raw3215_device_lock);
 709         if (line == NR_3215) {
 710                 raw3215_free_info(raw);
 711                 return -ENODEV;
 712         }
 713
 714         return 0;
 715 }
 716
 717 static void raw3215_remove (struct ccw_device *cdev)
 718 {
 719         struct raw3215_info *raw;
 720         unsigned int line;
 721
 722         ccw_device_set_offline(cdev);
 723         raw = dev_get_drvdata(&cdev->dev);
 724         if (raw) {
 725                 spin_lock(&raw3215_device_lock);
 726                 for (line = 0; line < NR_3215; line++)
 727                         if (raw3215[line] == raw)
 728                                 break;
 729                 raw3215[line] = NULL;
 730                 spin_unlock(&raw3215_device_lock);
 731                 dev_set_drvdata(&cdev->dev, NULL);
 732                 raw3215_free_info(raw);
 733         }
 734 }
 735
 736 static int raw3215_set_online (struct ccw_device *cdev)
 737 {
 738         struct raw3215_info *raw;
 739
 740         raw = dev_get_drvdata(&cdev->dev);
 741         if (!raw)
 742                 return -ENODEV;
 743
 744         return raw3215_startup(raw);
 745 }
 746
 747 static int raw3215_set_offline (struct ccw_device *cdev)
 748 {
 749         struct raw3215_info *raw;
 750
 751         raw = dev_get_drvdata(&cdev->dev);
 752         if (!raw)
 753                 return -ENODEV;
 754
 755         raw3215_shutdown(raw);
 756
 757         return 0;
 758 }
 759
 760 static int raw3215_pm_stop(struct ccw_device *cdev)
 761 {
 762         struct raw3215_info *raw;
 763         unsigned long flags;
 764
 765         /* Empty the output buffer, then prevent new I/O. */
 766         raw = dev_get_drvdata(&cdev->dev);
 767         spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
 768         raw3215_make_room(raw, RAW3215_BUFFER_SIZE);
 769         raw->port.flags |= ASYNC_SUSPENDED;
 770         spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
 771         return 0;
 772 }
 773
 774 static int raw3215_pm_start(struct ccw_device *cdev)
 775 {
 776         struct raw3215_info *raw;
 777         unsigned long flags;
 778
 779         /* Allow I/O again and flush output buffer. */
 780         raw = dev_get_drvdata(&cdev->dev);
 781         spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
 782         raw->port.flags &= ~ASYNC_SUSPENDED;
 783         raw->flags |= RAW3215_FLUSHING;
 784         raw3215_try_io(raw);
 785         raw->flags &= ~RAW3215_FLUSHING;
 786         spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
 787         return 0;
 788 }
 789
 790 static struct ccw_device_id raw3215_id[] = {
 791         { CCW_DEVICE(0x3215, 0) },
 792         { /* end of list */ },
 793 };
 794
 795 static struct ccw_driver raw3215_ccw_driver = {
 796         .driver = {
 797                 .name   = "3215",
 798                 .owner  = THIS_MODULE,
 799         },
 800         .ids            = raw3215_id,
 801         .probe          = &raw3215_probe,
 802         .remove         = &raw3215_remove,
 803         .set_online     = &raw3215_set_online,
 804         .set_offline    = &raw3215_set_offline,
 805         .freeze         = &raw3215_pm_stop,
 806         .thaw           = &raw3215_pm_start,
 807         .restore        = &raw3215_pm_start,
 808         .int_class      = IOINT_C15,
 809 };
 810
 811 #ifdef CONFIG_TN3215_CONSOLE
 812 /*
 813  * Write a string to the 3215 console
 814  */
 815 static void con3215_write(struct console *co, const char *str,
 816                           unsigned int count)
 817 {
 818         struct raw3215_info *raw;
 819         int i;
 820
 821         if (count <= 0)
 822                 return;
 823         raw = raw3215[0];       /* console 3215 is the first one */
 824         while (count > 0) {
 825                 for (i = 0; i < count; i++)
 826                         if (str[i] == '\t' || str[i] == '\n')
 827                                 break;
 828                 raw3215_write(raw, str, i);
 829                 count -= i;
 830                 str += i;
 831                 if (count > 0) {
 832                         raw3215_putchar(raw, *str);
 833                         count--;
 834                         str++;
 835                 }
 836         }
 837 }
 838
 839 static struct tty_driver *con3215_device(struct console *c, int *index)
 840 {
 841         *index = c->index;
 842         return tty3215_driver;
 843 }
 844
 845 /*
 846  * panic() calls con3215_flush through a panic_notifier
 847  * before the system enters a disabled, endless loop.
 848  */
 849 static void con3215_flush(void)
 850 {
 851         struct raw3215_info *raw;
 852         unsigned long flags;
 853
 854         raw = raw3215[0];  /* console 3215 is the first one */
 855         if (raw->port.flags & ASYNC_SUSPENDED)
 856                 /* The console is still frozen for suspend. */
 857                 if (ccw_device_force_console())
 858                         /* Forcing didn't work, no panic message .. */
 859                         return;
 860         spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
 861         raw3215_make_room(raw, RAW3215_BUFFER_SIZE);
 862         spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
 863 }
 864
 865 static int con3215_notify(struct notifier_block *self,
 866                           unsigned long event, void *data)
 867 {
 868         con3215_flush();
 869         return NOTIFY_OK;
 870 }
 871
 872 static struct notifier_block on_panic_nb = {
 873         .notifier_call = con3215_notify,
 874         .priority = 0,
 875 };
 876
 877 static struct notifier_block on_reboot_nb = {
 878         .notifier_call = con3215_notify,
 879         .priority = 0,
 880 };
 881
 882 /*
 883  *  The console structure for the 3215 console
 884  */
 885 static struct console con3215 = {
 886         .name    = "ttyS",
 887         .write   = con3215_write,
 888         .device  = con3215_device,
 889         .flags   = CON_PRINTBUFFER,
 890 };
 891
 892 /*
 893  * 3215 console initialization code called from console_init().
 894  */
 895 static int __init con3215_init(void)
 896 {
 897         struct ccw_device *cdev;
 898         struct raw3215_info *raw;
 899         struct raw3215_req *req;
 900         int i;
 901
 902         /* Check if 3215 is to be the console */
 903         if (!CONSOLE_IS_3215)
 904                 return -ENODEV;
 905
 906         /* Set the console mode for VM */
 907         if (MACHINE_IS_VM) {
 908                 cpcmd("TERM CONMODE 3215", NULL, 0, NULL);
 909                 cpcmd("TERM AUTOCR OFF", NULL, 0, NULL);
 910         }
 911
 912         /* allocate 3215 request structures */
 913         raw3215_freelist = NULL;
 914         spin_lock_init(&raw3215_freelist_lock);
 915         for (i = 0; i < NR_3215_REQ; i++) {
 916                 req = kzalloc(sizeof(struct raw3215_req), GFP_KERNEL | GFP_DMA);
 917                 req->next = raw3215_freelist;
 918                 raw3215_freelist = req;
 919         }
 920
 921         cdev = ccw_device_probe_console();
 922         if (IS_ERR(cdev))
 923                 return -ENODEV;
 924
 925         raw3215[0] = raw = raw3215_alloc_info();
 926         raw->cdev = cdev;
 927         dev_set_drvdata(&cdev->dev, raw);
 928         cdev->handler = raw3215_irq;
 929
 930         /* Request the console irq */
 931         if (raw3215_startup(raw) != 0) {
 932                 raw3215_free_info(raw);
 933                 raw3215[0] = NULL;
 934                 return -ENODEV;
 935         }
 936         atomic_notifier_chain_register(&panic_notifier_list, &on_panic_nb);
 937         register_reboot_notifier(&on_reboot_nb);
 938         register_console(&con3215);
 939         return 0;
 940 }
 941 console_initcall(con3215_init);
 942 #endif
 943
 944 static int tty3215_install(struct tty_driver *driver, struct tty_struct *tty)
 945 {
 946         struct raw3215_info *raw;
 947
 948         raw = raw3215[tty->index];
 949         if (raw == NULL)
 950                 return -ENODEV;
 951
 952         tty->driver_data = raw;
 953
 954         return tty_port_install(&raw->port, driver, tty);
 955 }
 956
 957 /*
 958  * tty3215_open
 959  *
 960  * This routine is called whenever a 3215 tty is opened.
 961  */
 962 static int tty3215_open(struct tty_struct *tty, struct file * filp)
 963 {
 964         struct raw3215_info *raw = tty->driver_data;
 965         int retval;
 966
 967         tty_port_tty_set(&raw->port, tty);
 968
 969         tty->low_latency = 0;  /* don't use bottom half for pushing chars */
 970         /*
 971          * Start up 3215 device
 972          */
 973         retval = raw3215_startup(raw);
 974         if (retval)
 975                 return retval;
 976
 977         return 0;
 978 }
 979
 980 /*
 981  * tty3215_close()
 982  *
 983  * This routine is called when the 3215 tty is closed. We wait
 984  * for the remaining request to be completed. Then we clean up.
 985  */
 986 static void tty3215_close(struct tty_struct *tty, struct file * filp)
 987 {
 988         struct raw3215_info *raw;
 989
 990         raw = (struct raw3215_info *) tty->driver_data;
 991         if (raw == NULL || tty->count > 1)
 992                 return;
 993         tty->closing = 1;
 994         /* Shutdown the terminal */
 995         raw3215_shutdown(raw);
 996         tasklet_kill(&raw->tlet);
 997         tty->closing = 0;
 998         tty_port_tty_set(&raw->port, NULL);
 999 }
1000
1001 /*
1002  * Returns the amount of free space in the output buffer.
1003  */
1004 static int tty3215_write_room(struct tty_struct *tty)
1005 {
1006         struct raw3215_info *raw;
1007
1008         raw = (struct raw3215_info *) tty->driver_data;
1009
1010         /* Subtract TAB_STOP_SIZE to allow for a tab, 8 <<< 64K */
1011         if ((RAW3215_BUFFER_SIZE - raw->count - TAB_STOP_SIZE) >= 0)
1012                 return RAW3215_BUFFER_SIZE - raw->count - TAB_STOP_SIZE;
1013         else
1014                 return 0;
1015 }
1016
1017 /*
1018  * String write routine for 3215 ttys
1019  */
1020 static int tty3215_write(struct tty_struct * tty,
1021                          const unsigned char *buf, int count)
1022 {
1023         struct raw3215_info *raw;
1024
1025         if (!tty)
1026                 return 0;
1027         raw = (struct raw3215_info *) tty->driver_data;
1028         raw3215_write(raw, buf, count);
1029         return count;
1030 }
1031
1032 /*
1033  * Put character routine for 3215 ttys
1034  */
1035 static int tty3215_put_char(struct tty_struct *tty, unsigned char ch)
1036 {
1037         struct raw3215_info *raw;
1038
1039         if (!tty)
1040                 return 0;
1041         raw = (struct raw3215_info *) tty->driver_data;
1042         raw3215_putchar(raw, ch);
1043         return 1;
1044 }
1045
1046 static void tty3215_flush_chars(struct tty_struct *tty)
1047 {
1048 }
1049
1050 /*
1051  * Returns the number of characters in the output buffer
1052  */
1053 static int tty3215_chars_in_buffer(struct tty_struct *tty)
1054 {
1055         struct raw3215_info *raw;
1056
1057         raw = (struct raw3215_info *) tty->driver_data;
1058         return raw->count;
1059 }
1060
1061 static void tty3215_flush_buffer(struct tty_struct *tty)
1062 {
1063         struct raw3215_info *raw;
1064
1065         raw = (struct raw3215_info *) tty->driver_data;
1066         raw3215_flush_buffer(raw);
1067         tty_wakeup(tty);
1068 }
1069
1070 /*
1071  * Disable reading from a 3215 tty
1072  */
1073 static void tty3215_throttle(struct tty_struct * tty)
1074 {
1075         struct raw3215_info *raw;
1076
1077         raw = (struct raw3215_info *) tty->driver_data;
1078         raw->flags |= RAW3215_THROTTLED;
1079 }
1080
1081 /*
1082  * Enable reading from a 3215 tty
1083  */
1084 static void tty3215_unthrottle(struct tty_struct * tty)
1085 {
1086         struct raw3215_info *raw;
1087         unsigned long flags;
1088
1089         raw = (struct raw3215_info *) tty->driver_data;
1090         if (raw->flags & RAW3215_THROTTLED) {
1091                 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
1092                 raw->flags &= ~RAW3215_THROTTLED;
1093                 raw3215_try_io(raw);
1094                 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
1095         }
1096 }
1097
1098 /*
1099  * Disable writing to a 3215 tty
1100  */
1101 static void tty3215_stop(struct tty_struct *tty)
1102 {
1103         struct raw3215_info *raw;
1104
1105         raw = (struct raw3215_info *) tty->driver_data;
1106         raw->flags |= RAW3215_STOPPED;
1107 }
1108
1109 /*
1110  * Enable writing to a 3215 tty
1111  */
1112 static void tty3215_start(struct tty_struct *tty)
1113 {
1114         struct raw3215_info *raw;
1115         unsigned long flags;
1116
1117         raw = (struct raw3215_info *) tty->driver_data;
1118         if (raw->flags & RAW3215_STOPPED) {
1119                 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
1120                 raw->flags &= ~RAW3215_STOPPED;
1121                 raw3215_try_io(raw);
1122                 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
1123         }
1124 }
1125
1126 static const struct tty_operations tty3215_ops = {
1127         .install = tty3215_install,
1128         .open = tty3215_open,
1129         .close = tty3215_close,
1130         .write = tty3215_write,
1131         .put_char = tty3215_put_char,
1132         .flush_chars = tty3215_flush_chars,
1133         .write_room = tty3215_write_room,
1134         .chars_in_buffer = tty3215_chars_in_buffer,
1135         .flush_buffer = tty3215_flush_buffer,
1136         .throttle = tty3215_throttle,
1137         .unthrottle = tty3215_unthrottle,
1138         .stop = tty3215_stop,
1139         .start = tty3215_start,
1140 };
1141
1142 /*
1143  * 3215 tty registration code called from tty_init().
1144  * Most kernel services (incl. kmalloc) are available at this poimt.
1145  */
1146 static int __init tty3215_init(void)
1147 {
1148         struct tty_driver *driver;
1149         int ret;
1150
1151         if (!CONSOLE_IS_3215)
1152                 return 0;
1153
1154         driver = alloc_tty_driver(NR_3215);
1155         if (!driver)
1156                 return -ENOMEM;
1157
1158         ret = ccw_driver_register(&raw3215_ccw_driver);
1159         if (ret) {
1160                 put_tty_driver(driver);
1161                 return ret;
1162         }
1163         /*
1164          * Initialize the tty_driver structure
1165          * Entries in tty3215_driver that are NOT initialized:
1166          * proc_entry, set_termios, flush_buffer, set_ldisc, write_proc
1167          */
1168
1169         driver->driver_name = "tty3215";
1170         driver->name = "ttyS";
1171         driver->major = TTY_MAJOR;
1172         driver->minor_start = 64;
1173         driver->type = TTY_DRIVER_TYPE_SYSTEM;
1174         driver->subtype = SYSTEM_TYPE_TTY;
1175         driver->init_termios = tty_std_termios;
1176         driver->init_termios.c_iflag = IGNBRK | IGNPAR;
1177         driver->init_termios.c_oflag = ONLCR | XTABS;
1178         driver->init_termios.c_lflag = ISIG;
1179         driver->flags = TTY_DRIVER_REAL_RAW;
1180         tty_set_operations(driver, &tty3215_ops);
1181         ret = tty_register_driver(driver);
1182         if (ret) {
1183                 put_tty_driver(driver);
1184                 return ret;
1185         }
1186         tty3215_driver = driver;
1187         return 0;
1188 }
1189
1190 static void __exit tty3215_exit(void)
1191 {
1192         tty_unregister_driver(tty3215_driver);
1193         put_tty_driver(tty3215_driver);
1194         ccw_driver_unregister(&raw3215_ccw_driver);
1195 }
1196
1197 module_init(tty3215_init);
1198 module_exit(tty3215_exit);