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(&raw->port, cchar,
 415                                                 TTY_NORMAL);
 416                                 tty_flip_buffer_push(&raw->port);
 417                                 break;
 418
 419                         case CTRLCHAR_NONE:
 420                                 if (count < 2 ||
 421                                     (strncmp(raw->inbuf+count-2, "\252n", 2) &&
 422                                      strncmp(raw->inbuf+count-2, "^n", 2)) ) {
 423                                         /* add the auto \n */
 424                                         raw->inbuf[count] = '\n';
 425                                         count++;
 426                                 } else
 427                                         count -= 2;
 428                                 tty_insert_flip_string(&raw->port, raw->inbuf,
 429                                                 count);
 430                                 tty_flip_buffer_push(&raw->port);
 431                                 break;
 432                         }
 433                 } else if (req->type == RAW3215_WRITE) {
 434                         raw->count -= req->len;
 435                         raw->written -= req->len;
 436                 }
 437                 raw->flags &= ~RAW3215_WORKING;
 438                 raw3215_free_req(req);
 439                 /* check for empty wait */
 440                 if (waitqueue_active(&raw->empty_wait) &&
 441                     raw->queued_write == NULL &&
 442                     raw->queued_read == NULL) {
 443                         wake_up_interruptible(&raw->empty_wait);
 444                 }
 445                 raw3215_next_io(raw, tty);
 446                 break;
 447         default:
 448                 /* Strange interrupt, I'll do my best to clean up */
 449                 if (req != NULL && req->type != RAW3215_FREE) {
 450                         if (req->type == RAW3215_WRITE) {
 451                                 raw->count -= req->len;
 452                                 raw->written -= req->len;
 453                         }
 454                         raw->flags &= ~RAW3215_WORKING;
 455                         raw3215_free_req(req);
 456                 }
 457                 raw3215_next_io(raw, tty);
 458         }
 459 put_tty:
 460         tty_kref_put(tty);
 461 }
 462
 463 /*
 464  * Drop the oldest line from the output buffer.
 465  */
 466 static void raw3215_drop_line(struct raw3215_info *raw)
 467 {
 468         int ix;
 469         char ch;
 470
 471         BUG_ON(raw->written != 0);
 472         ix = (raw->head - raw->count) & (RAW3215_BUFFER_SIZE - 1);
 473         while (raw->count > 0) {
 474                 ch = raw->buffer[ix];
 475                 ix = (ix + 1) & (RAW3215_BUFFER_SIZE - 1);
 476                 raw->count--;
 477                 if (ch == 0x15)
 478                         break;
 479         }
 480         raw->head = ix;
 481 }
 482
 483 /*
 484  * Wait until length bytes are available int the output buffer.
 485  * Has to be called with the s390irq lock held. Can be called
 486  * disabled.
 487  */
 488 static void raw3215_make_room(struct raw3215_info *raw, unsigned int length)
 489 {
 490         while (RAW3215_BUFFER_SIZE - raw->count < length) {
 491                 /* While console is frozen for suspend we have no other
 492                  * choice but to drop message from the buffer to make
 493                  * room for even more messages. */
 494                 if (raw->port.flags & ASYNC_SUSPENDED) {
 495                         raw3215_drop_line(raw);
 496                         continue;
 497                 }
 498                 /* there might be a request pending */
 499                 raw->flags |= RAW3215_FLUSHING;
 500                 raw3215_mk_write_req(raw);
 501                 raw3215_try_io(raw);
 502                 raw->flags &= ~RAW3215_FLUSHING;
 503 #ifdef CONFIG_TN3215_CONSOLE
 504                 wait_cons_dev();
 505 #endif
 506                 /* Enough room freed up ? */
 507                 if (RAW3215_BUFFER_SIZE - raw->count >= length)
 508                         break;
 509                 /* there might be another cpu waiting for the lock */
 510                 spin_unlock(get_ccwdev_lock(raw->cdev));
 511                 udelay(100);
 512                 spin_lock(get_ccwdev_lock(raw->cdev));
 513         }
 514 }
 515
 516 /*
 517  * String write routine for 3215 devices
 518  */
 519 static void raw3215_write(struct raw3215_info *raw, const char *str,
 520                           unsigned int length)
 521 {
 522         unsigned long flags;
 523         int c, count;
 524
 525         while (length > 0) {
 526                 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
 527                 count = (length > RAW3215_BUFFER_SIZE) ?
 528                                              RAW3215_BUFFER_SIZE : length;
 529                 length -= count;
 530
 531                 raw3215_make_room(raw, count);
 532
 533                 /* copy string to output buffer and convert it to EBCDIC */
 534                 while (1) {
 535                         c = min_t(int, count,
 536                                   min(RAW3215_BUFFER_SIZE - raw->count,
 537                                       RAW3215_BUFFER_SIZE - raw->head));
 538                         if (c <= 0)
 539                                 break;
 540                         memcpy(raw->buffer + raw->head, str, c);
 541                         ASCEBC(raw->buffer + raw->head, c);
 542                         raw->head = (raw->head + c) & (RAW3215_BUFFER_SIZE - 1);
 543                         raw->count += c;
 544                         raw->line_pos += c;
 545                         str += c;
 546                         count -= c;
 547                 }
 548                 if (!(raw->flags & RAW3215_WORKING)) {
 549                         raw3215_mk_write_req(raw);
 550                         /* start or queue request */
 551                         raw3215_try_io(raw);
 552                 }
 553                 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
 554         }
 555 }
 556
 557 /*
 558  * Put character routine for 3215 devices
 559  */
 560 static void raw3215_putchar(struct raw3215_info *raw, unsigned char ch)
 561 {
 562         unsigned long flags;
 563         unsigned int length, i;
 564
 565         spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
 566         if (ch == '\t') {
 567                 length = TAB_STOP_SIZE - (raw->line_pos%TAB_STOP_SIZE);
 568                 raw->line_pos += length;
 569                 ch = ' ';
 570         } else if (ch == '\n') {
 571                 length = 1;
 572                 raw->line_pos = 0;
 573         } else {
 574                 length = 1;
 575                 raw->line_pos++;
 576         }
 577         raw3215_make_room(raw, length);
 578
 579         for (i = 0; i < length; i++) {
 580                 raw->buffer[raw->head] = (char) _ascebc[(int) ch];
 581                 raw->head = (raw->head + 1) & (RAW3215_BUFFER_SIZE - 1);
 582                 raw->count++;
 583         }
 584         if (!(raw->flags & RAW3215_WORKING)) {
 585                 raw3215_mk_write_req(raw);
 586                 /* start or queue request */
 587                 raw3215_try_io(raw);
 588         }
 589         spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
 590 }
 591
 592 /*
 593  * Flush routine, it simply sets the flush flag and tries to start
 594  * pending IO.
 595  */
 596 static void raw3215_flush_buffer(struct raw3215_info *raw)
 597 {
 598         unsigned long flags;
 599
 600         spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
 601         if (raw->count > 0) {
 602                 raw->flags |= RAW3215_FLUSHING;
 603                 raw3215_try_io(raw);
 604                 raw->flags &= ~RAW3215_FLUSHING;
 605         }
 606         spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
 607 }
 608
 609 /*
 610  * Fire up a 3215 device.
 611  */
 612 static int raw3215_startup(struct raw3215_info *raw)
 613 {
 614         unsigned long flags;
 615
 616         if (raw->port.flags & ASYNC_INITIALIZED)
 617                 return 0;
 618         raw->line_pos = 0;
 619         raw->port.flags |= ASYNC_INITIALIZED;
 620         spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
 621         raw3215_try_io(raw);
 622         spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
 623
 624         return 0;
 625 }
 626
 627 /*
 628  * Shutdown a 3215 device.
 629  */
 630 static void raw3215_shutdown(struct raw3215_info *raw)
 631 {
 632         DECLARE_WAITQUEUE(wait, current);
 633         unsigned long flags;
 634
 635         if (!(raw->port.flags & ASYNC_INITIALIZED))
 636                 return;
 637         /* Wait for outstanding requests, then free irq */
 638         spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
 639         if ((raw->flags & RAW3215_WORKING) ||
 640             raw->queued_write != NULL ||
 641             raw->queued_read != NULL) {
 642                 raw->port.flags |= ASYNC_CLOSING;
 643                 add_wait_queue(&raw->empty_wait, &wait);
 644                 set_current_state(TASK_INTERRUPTIBLE);
 645                 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
 646                 schedule();
 647                 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
 648                 remove_wait_queue(&raw->empty_wait, &wait);
 649                 set_current_state(TASK_RUNNING);
 650                 raw->port.flags &= ~(ASYNC_INITIALIZED | ASYNC_CLOSING);
 651         }
 652         spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
 653 }
 654
 655 static struct raw3215_info *raw3215_alloc_info(void)
 656 {
 657         struct raw3215_info *info;
 658
 659         info = kzalloc(sizeof(struct raw3215_info), GFP_KERNEL | GFP_DMA);
 660         if (!info)
 661                 return NULL;
 662
 663         info->buffer = kzalloc(RAW3215_BUFFER_SIZE, GFP_KERNEL | GFP_DMA);
 664         info->inbuf = kzalloc(RAW3215_INBUF_SIZE, GFP_KERNEL | GFP_DMA);
 665         if (!info->buffer || !info->inbuf) {
 666                 kfree(info);
 667                 return NULL;
 668         }
 669
 670         setup_timer(&info->timer, raw3215_timeout, (unsigned long)info);
 671         init_waitqueue_head(&info->empty_wait);
 672         tasklet_init(&info->tlet, raw3215_wakeup, (unsigned long)info);
 673         tty_port_init(&info->port);
 674
 675         return info;
 676 }
 677
 678 static void raw3215_free_info(struct raw3215_info *raw)
 679 {
 680         kfree(raw->inbuf);
 681         kfree(raw->buffer);
 682         tty_port_destroy(&raw->port);
 683         kfree(raw);
 684 }
 685
 686 static int raw3215_probe (struct ccw_device *cdev)
 687 {
 688         struct raw3215_info *raw;
 689         int line;
 690
 691         /* Console is special. */
 692         if (raw3215[0] && (raw3215[0] == dev_get_drvdata(&cdev->dev)))
 693                 return 0;
 694
 695         raw = raw3215_alloc_info();
 696         if (raw == NULL)
 697                 return -ENOMEM;
 698
 699         raw->cdev = cdev;
 700         dev_set_drvdata(&cdev->dev, raw);
 701         cdev->handler = raw3215_irq;
 702
 703         spin_lock(&raw3215_device_lock);
 704         for (line = 0; line < NR_3215; line++) {
 705                 if (!raw3215[line]) {
 706                         raw3215[line] = raw;
 707                         break;
 708                 }
 709         }
 710         spin_unlock(&raw3215_device_lock);
 711         if (line == NR_3215) {
 712                 raw3215_free_info(raw);
 713                 return -ENODEV;
 714         }
 715
 716         return 0;
 717 }
 718
 719 static void raw3215_remove (struct ccw_device *cdev)
 720 {
 721         struct raw3215_info *raw;
 722         unsigned int line;
 723
 724         ccw_device_set_offline(cdev);
 725         raw = dev_get_drvdata(&cdev->dev);
 726         if (raw) {
 727                 spin_lock(&raw3215_device_lock);
 728                 for (line = 0; line < NR_3215; line++)
 729                         if (raw3215[line] == raw)
 730                                 break;
 731                 raw3215[line] = NULL;
 732                 spin_unlock(&raw3215_device_lock);
 733                 dev_set_drvdata(&cdev->dev, NULL);
 734                 raw3215_free_info(raw);
 735         }
 736 }
 737
 738 static int raw3215_set_online (struct ccw_device *cdev)
 739 {
 740         struct raw3215_info *raw;
 741
 742         raw = dev_get_drvdata(&cdev->dev);
 743         if (!raw)
 744                 return -ENODEV;
 745
 746         return raw3215_startup(raw);
 747 }
 748
 749 static int raw3215_set_offline (struct ccw_device *cdev)
 750 {
 751         struct raw3215_info *raw;
 752
 753         raw = dev_get_drvdata(&cdev->dev);
 754         if (!raw)
 755                 return -ENODEV;
 756
 757         raw3215_shutdown(raw);
 758
 759         return 0;
 760 }
 761
 762 static int raw3215_pm_stop(struct ccw_device *cdev)
 763 {
 764         struct raw3215_info *raw;
 765         unsigned long flags;
 766
 767         /* Empty the output buffer, then prevent new I/O. */
 768         raw = dev_get_drvdata(&cdev->dev);
 769         spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
 770         raw3215_make_room(raw, RAW3215_BUFFER_SIZE);
 771         raw->port.flags |= ASYNC_SUSPENDED;
 772         spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
 773         return 0;
 774 }
 775
 776 static int raw3215_pm_start(struct ccw_device *cdev)
 777 {
 778         struct raw3215_info *raw;
 779         unsigned long flags;
 780
 781         /* Allow I/O again and flush output buffer. */
 782         raw = dev_get_drvdata(&cdev->dev);
 783         spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
 784         raw->port.flags &= ~ASYNC_SUSPENDED;
 785         raw->flags |= RAW3215_FLUSHING;
 786         raw3215_try_io(raw);
 787         raw->flags &= ~RAW3215_FLUSHING;
 788         spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
 789         return 0;
 790 }
 791
 792 static struct ccw_device_id raw3215_id[] = {
 793         { CCW_DEVICE(0x3215, 0) },
 794         { /* end of list */ },
 795 };
 796
 797 static struct ccw_driver raw3215_ccw_driver = {
 798         .driver = {
 799                 .name   = "3215",
 800                 .owner  = THIS_MODULE,
 801         },
 802         .ids            = raw3215_id,
 803         .probe          = &raw3215_probe,
 804         .remove         = &raw3215_remove,
 805         .set_online     = &raw3215_set_online,
 806         .set_offline    = &raw3215_set_offline,
 807         .freeze         = &raw3215_pm_stop,
 808         .thaw           = &raw3215_pm_start,
 809         .restore        = &raw3215_pm_start,
 810         .int_class      = IOINT_C15,
 811 };
 812
 813 #ifdef CONFIG_TN3215_CONSOLE
 814 /*
 815  * Write a string to the 3215 console
 816  */
 817 static void con3215_write(struct console *co, const char *str,
 818                           unsigned int count)
 819 {
 820         struct raw3215_info *raw;
 821         int i;
 822
 823         if (count <= 0)
 824                 return;
 825         raw = raw3215[0];       /* console 3215 is the first one */
 826         while (count > 0) {
 827                 for (i = 0; i < count; i++)
 828                         if (str[i] == '\t' || str[i] == '\n')
 829                                 break;
 830                 raw3215_write(raw, str, i);
 831                 count -= i;
 832                 str += i;
 833                 if (count > 0) {
 834                         raw3215_putchar(raw, *str);
 835                         count--;
 836                         str++;
 837                 }
 838         }
 839 }
 840
 841 static struct tty_driver *con3215_device(struct console *c, int *index)
 842 {
 843         *index = c->index;
 844         return tty3215_driver;
 845 }
 846
 847 /*
 848  * panic() calls con3215_flush through a panic_notifier
 849  * before the system enters a disabled, endless loop.
 850  */
 851 static void con3215_flush(void)
 852 {
 853         struct raw3215_info *raw;
 854         unsigned long flags;
 855
 856         raw = raw3215[0];  /* console 3215 is the first one */
 857         if (raw->port.flags & ASYNC_SUSPENDED)
 858                 /* The console is still frozen for suspend. */
 859                 if (ccw_device_force_console())
 860                         /* Forcing didn't work, no panic message .. */
 861                         return;
 862         spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
 863         raw3215_make_room(raw, RAW3215_BUFFER_SIZE);
 864         spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
 865 }
 866
 867 static int con3215_notify(struct notifier_block *self,
 868                           unsigned long event, void *data)
 869 {
 870         con3215_flush();
 871         return NOTIFY_OK;
 872 }
 873
 874 static struct notifier_block on_panic_nb = {
 875         .notifier_call = con3215_notify,
 876         .priority = 0,
 877 };
 878
 879 static struct notifier_block on_reboot_nb = {
 880         .notifier_call = con3215_notify,
 881         .priority = 0,
 882 };
 883
 884 /*
 885  *  The console structure for the 3215 console
 886  */
 887 static struct console con3215 = {
 888         .name    = "ttyS",
 889         .write   = con3215_write,
 890         .device  = con3215_device,
 891         .flags   = CON_PRINTBUFFER,
 892 };
 893
 894 /*
 895  * 3215 console initialization code called from console_init().
 896  */
 897 static int __init con3215_init(void)
 898 {
 899         struct ccw_device *cdev;
 900         struct raw3215_info *raw;
 901         struct raw3215_req *req;
 902         int i;
 903
 904         /* Check if 3215 is to be the console */
 905         if (!CONSOLE_IS_3215)
 906                 return -ENODEV;
 907
 908         /* Set the console mode for VM */
 909         if (MACHINE_IS_VM) {
 910                 cpcmd("TERM CONMODE 3215", NULL, 0, NULL);
 911                 cpcmd("TERM AUTOCR OFF", NULL, 0, NULL);
 912         }
 913
 914         /* allocate 3215 request structures */
 915         raw3215_freelist = NULL;
 916         spin_lock_init(&raw3215_freelist_lock);
 917         for (i = 0; i < NR_3215_REQ; i++) {
 918                 req = kzalloc(sizeof(struct raw3215_req), GFP_KERNEL | GFP_DMA);
 919                 req->next = raw3215_freelist;
 920                 raw3215_freelist = req;
 921         }
 922
 923         cdev = ccw_device_probe_console();
 924         if (IS_ERR(cdev))
 925                 return -ENODEV;
 926
 927         raw3215[0] = raw = raw3215_alloc_info();
 928         raw->cdev = cdev;
 929         dev_set_drvdata(&cdev->dev, raw);
 930         cdev->handler = raw3215_irq;
 931
 932         /* Request the console irq */
 933         if (raw3215_startup(raw) != 0) {
 934                 raw3215_free_info(raw);
 935                 raw3215[0] = NULL;
 936                 return -ENODEV;
 937         }
 938         atomic_notifier_chain_register(&panic_notifier_list, &on_panic_nb);
 939         register_reboot_notifier(&on_reboot_nb);
 940         register_console(&con3215);
 941         return 0;
 942 }
 943 console_initcall(con3215_init);
 944 #endif
 945
 946 static int tty3215_install(struct tty_driver *driver, struct tty_struct *tty)
 947 {
 948         struct raw3215_info *raw;
 949
 950         raw = raw3215[tty->index];
 951         if (raw == NULL)
 952                 return -ENODEV;
 953
 954         tty->driver_data = raw;
 955
 956         return tty_port_install(&raw->port, driver, tty);
 957 }
 958
 959 /*
 960  * tty3215_open
 961  *
 962  * This routine is called whenever a 3215 tty is opened.
 963  */
 964 static int tty3215_open(struct tty_struct *tty, struct file * filp)
 965 {
 966         struct raw3215_info *raw = tty->driver_data;
 967         int retval;
 968
 969         tty_port_tty_set(&raw->port, tty);
 970
 971         raw->port.low_latency = 0; /* don't use bottom half for pushing chars */
 972         /*
 973          * Start up 3215 device
 974          */
 975         retval = raw3215_startup(raw);
 976         if (retval)
 977                 return retval;
 978
 979         return 0;
 980 }
 981
 982 /*
 983  * tty3215_close()
 984  *
 985  * This routine is called when the 3215 tty is closed. We wait
 986  * for the remaining request to be completed. Then we clean up.
 987  */
 988 static void tty3215_close(struct tty_struct *tty, struct file * filp)
 989 {
 990         struct raw3215_info *raw;
 991
 992         raw = (struct raw3215_info *) tty->driver_data;
 993         if (raw == NULL || tty->count > 1)
 994                 return;
 995         tty->closing = 1;
 996         /* Shutdown the terminal */
 997         raw3215_shutdown(raw);
 998         tasklet_kill(&raw->tlet);
 999         tty->closing = 0;
1000         tty_port_tty_set(&raw->port, NULL);
1001 }
1002
1003 /*
1004  * Returns the amount of free space in the output buffer.
1005  */
1006 static int tty3215_write_room(struct tty_struct *tty)
1007 {
1008         struct raw3215_info *raw;
1009
1010         raw = (struct raw3215_info *) tty->driver_data;
1011
1012         /* Subtract TAB_STOP_SIZE to allow for a tab, 8 <<< 64K */
1013         if ((RAW3215_BUFFER_SIZE - raw->count - TAB_STOP_SIZE) >= 0)
1014                 return RAW3215_BUFFER_SIZE - raw->count - TAB_STOP_SIZE;
1015         else
1016                 return 0;
1017 }
1018
1019 /*
1020  * String write routine for 3215 ttys
1021  */
1022 static int tty3215_write(struct tty_struct * tty,
1023                          const unsigned char *buf, int count)
1024 {
1025         struct raw3215_info *raw;
1026
1027         if (!tty)
1028                 return 0;
1029         raw = (struct raw3215_info *) tty->driver_data;
1030         raw3215_write(raw, buf, count);
1031         return count;
1032 }
1033
1034 /*
1035  * Put character routine for 3215 ttys
1036  */
1037 static int tty3215_put_char(struct tty_struct *tty, unsigned char ch)
1038 {
1039         struct raw3215_info *raw;
1040
1041         if (!tty)
1042                 return 0;
1043         raw = (struct raw3215_info *) tty->driver_data;
1044         raw3215_putchar(raw, ch);
1045         return 1;
1046 }
1047
1048 static void tty3215_flush_chars(struct tty_struct *tty)
1049 {
1050 }
1051
1052 /*
1053  * Returns the number of characters in the output buffer
1054  */
1055 static int tty3215_chars_in_buffer(struct tty_struct *tty)
1056 {
1057         struct raw3215_info *raw;
1058
1059         raw = (struct raw3215_info *) tty->driver_data;
1060         return raw->count;
1061 }
1062
1063 static void tty3215_flush_buffer(struct tty_struct *tty)
1064 {
1065         struct raw3215_info *raw;
1066
1067         raw = (struct raw3215_info *) tty->driver_data;
1068         raw3215_flush_buffer(raw);
1069         tty_wakeup(tty);
1070 }
1071
1072 /*
1073  * Disable reading from a 3215 tty
1074  */
1075 static void tty3215_throttle(struct tty_struct * tty)
1076 {
1077         struct raw3215_info *raw;
1078
1079         raw = (struct raw3215_info *) tty->driver_data;
1080         raw->flags |= RAW3215_THROTTLED;
1081 }
1082
1083 /*
1084  * Enable reading from a 3215 tty
1085  */
1086 static void tty3215_unthrottle(struct tty_struct * tty)
1087 {
1088         struct raw3215_info *raw;
1089         unsigned long flags;
1090
1091         raw = (struct raw3215_info *) tty->driver_data;
1092         if (raw->flags & RAW3215_THROTTLED) {
1093                 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
1094                 raw->flags &= ~RAW3215_THROTTLED;
1095                 raw3215_try_io(raw);
1096                 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
1097         }
1098 }
1099
1100 /*
1101  * Disable writing to a 3215 tty
1102  */
1103 static void tty3215_stop(struct tty_struct *tty)
1104 {
1105         struct raw3215_info *raw;
1106
1107         raw = (struct raw3215_info *) tty->driver_data;
1108         raw->flags |= RAW3215_STOPPED;
1109 }
1110
1111 /*
1112  * Enable writing to a 3215 tty
1113  */
1114 static void tty3215_start(struct tty_struct *tty)
1115 {
1116         struct raw3215_info *raw;
1117         unsigned long flags;
1118
1119         raw = (struct raw3215_info *) tty->driver_data;
1120         if (raw->flags & RAW3215_STOPPED) {
1121                 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
1122                 raw->flags &= ~RAW3215_STOPPED;
1123                 raw3215_try_io(raw);
1124                 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
1125         }
1126 }
1127
1128 static const struct tty_operations tty3215_ops = {
1129         .install = tty3215_install,
1130         .open = tty3215_open,
1131         .close = tty3215_close,
1132         .write = tty3215_write,
1133         .put_char = tty3215_put_char,
1134         .flush_chars = tty3215_flush_chars,
1135         .write_room = tty3215_write_room,
1136         .chars_in_buffer = tty3215_chars_in_buffer,
1137         .flush_buffer = tty3215_flush_buffer,
1138         .throttle = tty3215_throttle,
1139         .unthrottle = tty3215_unthrottle,
1140         .stop = tty3215_stop,
1141         .start = tty3215_start,
1142 };
1143
1144 /*
1145  * 3215 tty registration code called from tty_init().
1146  * Most kernel services (incl. kmalloc) are available at this poimt.
1147  */
1148 static int __init tty3215_init(void)
1149 {
1150         struct tty_driver *driver;
1151         int ret;
1152
1153         if (!CONSOLE_IS_3215)
1154                 return 0;
1155
1156         driver = alloc_tty_driver(NR_3215);
1157         if (!driver)
1158                 return -ENOMEM;
1159
1160         ret = ccw_driver_register(&raw3215_ccw_driver);
1161         if (ret) {
1162                 put_tty_driver(driver);
1163                 return ret;
1164         }
1165         /*
1166          * Initialize the tty_driver structure
1167          * Entries in tty3215_driver that are NOT initialized:
1168          * proc_entry, set_termios, flush_buffer, set_ldisc, write_proc
1169          */
1170
1171         driver->driver_name = "tty3215";
1172         driver->name = "ttyS";
1173         driver->major = TTY_MAJOR;
1174         driver->minor_start = 64;
1175         driver->type = TTY_DRIVER_TYPE_SYSTEM;
1176         driver->subtype = SYSTEM_TYPE_TTY;
1177         driver->init_termios = tty_std_termios;
1178         driver->init_termios.c_iflag = IGNBRK | IGNPAR;
1179         driver->init_termios.c_oflag = ONLCR | XTABS;
1180         driver->init_termios.c_lflag = ISIG;
1181         driver->flags = TTY_DRIVER_REAL_RAW;
1182         tty_set_operations(driver, &tty3215_ops);
1183         ret = tty_register_driver(driver);
1184         if (ret) {
1185                 put_tty_driver(driver);
1186                 return ret;
1187         }
1188         tty3215_driver = driver;
1189         return 0;
1190 }
1191
1192 static void __exit tty3215_exit(void)
1193 {
1194         tty_unregister_driver(tty3215_driver);
1195         put_tty_driver(tty3215_driver);
1196         ccw_driver_unregister(&raw3215_ccw_driver);
1197 }
1198
1199 module_init(tty3215_init);
1200 module_exit(tty3215_exit);