drivers/s390/char/con3215.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * 3215 line mode terminal driver.
   4  *
   5  * Copyright IBM Corp. 1999, 2009
   6  * Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>
   7  *
   8  * Updated:
   9  *  Aug-2000: Added tab support
  10  *            Dan Morrison, IBM Corporation <dmorriso@cse.buffalo.edu>
  11  */
  12
  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/panic_notifier.h>
  23 #include <linux/reboot.h>
  24 #include <linux/serial.h> /* ASYNC_* flags */
  25 #include <linux/slab.h>
  26 #include <asm/ccwdev.h>
  27 #include <asm/cio.h>
  28 #include <asm/io.h>
  29 #include <asm/ebcdic.h>
  30 #include <linux/uaccess.h>
  31 #include <asm/delay.h>
  32 #include <asm/cpcmd.h>
  33 #include <asm/setup.h>
  34
  35 #include "ctrlchar.h"
  36
  37 #define NR_3215             1
  38 #define NR_3215_REQ         (4*NR_3215)
  39 #define RAW3215_BUFFER_SIZE 65536     /* output buffer size */
  40 #define RAW3215_INBUF_SIZE  256       /* input buffer size */
  41 #define RAW3215_MIN_SPACE   128       /* minimum free space for wakeup */
  42 #define RAW3215_MIN_WRITE   1024      /* min. length for immediate output */
  43 #define RAW3215_MAX_BYTES   3968      /* max. bytes to write with one ssch */
  44 #define RAW3215_MAX_NEWLINE 50        /* max. lines to write with one ssch */
  45 #define RAW3215_NR_CCWS     3
  46 #define RAW3215_TIMEOUT     HZ/10     /* time for delayed output */
  47
  48 #define RAW3215_FIXED       1         /* 3215 console device is not be freed */
  49 #define RAW3215_WORKING     4         /* set if a request is being worked on */
  50 #define RAW3215_THROTTLED   8         /* set if reading is disabled */
  51 #define RAW3215_STOPPED     16        /* set if writing is disabled */
  52 #define RAW3215_TIMER_RUNS  64        /* set if the output delay timer is on */
  53 #define RAW3215_FLUSHING    128       /* set to flush buffer (no delay) */
  54
  55 #define TAB_STOP_SIZE       8         /* tab stop size */
  56
  57 /*
  58  * Request types for a 3215 device
  59  */
  60 enum raw3215_type {
  61         RAW3215_FREE, RAW3215_READ, RAW3215_WRITE
  62 };
  63
  64 /*
  65  * Request structure for a 3215 device
  66  */
  67 struct raw3215_req {
  68         enum raw3215_type type;       /* type of the request */
  69         int start, len;               /* start index & len in output buffer */
  70         int delayable;                /* indication to wait for more data */
  71         int residual;                 /* residual count for read request */
  72         struct ccw1 ccws[RAW3215_NR_CCWS]; /* space for the channel program */
  73         struct raw3215_info *info;    /* pointer to main structure */
  74         struct raw3215_req *next;     /* pointer to next request */
  75 } __attribute__ ((aligned(8)));
  76
  77 struct raw3215_info {
  78         struct tty_port port;
  79         struct ccw_device *cdev;      /* device for tty driver */
  80         spinlock_t *lock;             /* pointer to irq lock */
  81         int flags;                    /* state flags */
  82         char *buffer;                 /* pointer to output buffer */
  83         char *inbuf;                  /* pointer to input buffer */
  84         int head;                     /* first free byte in output buffer */
  85         int count;                    /* number of bytes in output buffer */
  86         int written;                  /* number of bytes in write requests */
  87         struct raw3215_req *queued_read; /* pointer to queued read requests */
  88         struct raw3215_req *queued_write;/* pointer to queued write requests */
  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 DEFINE_SPINLOCK(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(struct timer_list *t)
 286 {
 287         struct raw3215_info *raw = from_timer(raw, t, timer);
 288         unsigned long flags;
 289
 290         spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
 291         raw->flags &= ~RAW3215_TIMER_RUNS;
 292         raw3215_mk_write_req(raw);
 293         raw3215_start_io(raw);
 294         if ((raw->queued_read || raw->queued_write) &&
 295             !(raw->flags & RAW3215_WORKING) &&
 296             !(raw->flags & RAW3215_TIMER_RUNS)) {
 297                 raw->timer.expires = RAW3215_TIMEOUT + jiffies;
 298                 add_timer(&raw->timer);
 299                 raw->flags |= RAW3215_TIMER_RUNS;
 300         }
 301         spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
 302 }
 303
 304 /*
 305  * Function to conditionally start an IO. A read is started immediately,
 306  * a write is only started immediately if the flush flag is on or the
 307  * amount of data is bigger than RAW3215_MIN_WRITE. If a write is not
 308  * done immediately a timer is started with a delay of RAW3215_TIMEOUT.
 309  */
 310 static inline void raw3215_try_io(struct raw3215_info *raw)
 311 {
 312         if (!tty_port_initialized(&raw->port))
 313                 return;
 314         if (raw->queued_read != NULL)
 315                 raw3215_start_io(raw);
 316         else if (raw->queued_write != NULL) {
 317                 if ((raw->queued_write->delayable == 0) ||
 318                     (raw->flags & RAW3215_FLUSHING)) {
 319                         /* execute write requests bigger than minimum size */
 320                         raw3215_start_io(raw);
 321                 }
 322         }
 323         if ((raw->queued_read || raw->queued_write) &&
 324             !(raw->flags & RAW3215_WORKING) &&
 325             !(raw->flags & RAW3215_TIMER_RUNS)) {
 326                 raw->timer.expires = RAW3215_TIMEOUT + jiffies;
 327                 add_timer(&raw->timer);
 328                 raw->flags |= RAW3215_TIMER_RUNS;
 329         }
 330 }
 331
 332 /*
 333  * Try to start the next IO and wake up processes waiting on the tty.
 334  */
 335 static void raw3215_next_io(struct raw3215_info *raw, struct tty_struct *tty)
 336 {
 337         raw3215_mk_write_req(raw);
 338         raw3215_try_io(raw);
 339         if (tty && RAW3215_BUFFER_SIZE - raw->count >= RAW3215_MIN_SPACE)
 340                 tty_wakeup(tty);
 341 }
 342
 343 /*
 344  * Interrupt routine, called from common io layer
 345  */
 346 static void raw3215_irq(struct ccw_device *cdev, unsigned long intparm,
 347                         struct irb *irb)
 348 {
 349         struct raw3215_info *raw;
 350         struct raw3215_req *req;
 351         struct tty_struct *tty;
 352         int cstat, dstat;
 353         int count;
 354
 355         raw = dev_get_drvdata(&cdev->dev);
 356         req = (struct raw3215_req *) intparm;
 357         tty = tty_port_tty_get(&raw->port);
 358         cstat = irb->scsw.cmd.cstat;
 359         dstat = irb->scsw.cmd.dstat;
 360         if (cstat != 0)
 361                 raw3215_next_io(raw, tty);
 362         if (dstat & 0x01) { /* we got a unit exception */
 363                 dstat &= ~0x01;  /* we can ignore it */
 364         }
 365         switch (dstat) {
 366         case 0x80:
 367                 if (cstat != 0)
 368                         break;
 369                 /* Attention interrupt, someone hit the enter key */
 370                 raw3215_mk_read_req(raw);
 371                 raw3215_next_io(raw, tty);
 372                 break;
 373         case 0x08:
 374         case 0x0C:
 375                 /* Channel end interrupt. */
 376                 if ((raw = req->info) == NULL)
 377                         goto put_tty;        /* That shouldn't happen ... */
 378                 if (req->type == RAW3215_READ) {
 379                         /* store residual count, then wait for device end */
 380                         req->residual = irb->scsw.cmd.count;
 381                 }
 382                 if (dstat == 0x08)
 383                         break;
 384                 fallthrough;
 385         case 0x04:
 386                 /* Device end interrupt. */
 387                 if ((raw = req->info) == NULL)
 388                         goto put_tty;        /* That shouldn't happen ... */
 389                 if (req->type == RAW3215_READ && tty != NULL) {
 390                         unsigned int cchar;
 391
 392                         count = 160 - req->residual;
 393                         EBCASC(raw->inbuf, count);
 394                         cchar = ctrlchar_handle(raw->inbuf, count, tty);
 395                         switch (cchar & CTRLCHAR_MASK) {
 396                         case CTRLCHAR_SYSRQ:
 397                                 break;
 398
 399                         case CTRLCHAR_CTRL:
 400                                 tty_insert_flip_char(&raw->port, cchar,
 401                                                 TTY_NORMAL);
 402                                 tty_flip_buffer_push(&raw->port);
 403                                 break;
 404
 405                         case CTRLCHAR_NONE:
 406                                 if (count < 2 ||
 407                                     (strncmp(raw->inbuf+count-2, "\252n", 2) &&
 408                                      strncmp(raw->inbuf+count-2, "^n", 2)) ) {
 409                                         /* add the auto \n */
 410                                         raw->inbuf[count] = '\n';
 411                                         count++;
 412                                 } else
 413                                         count -= 2;
 414                                 tty_insert_flip_string(&raw->port, raw->inbuf,
 415                                                 count);
 416                                 tty_flip_buffer_push(&raw->port);
 417                                 break;
 418                         }
 419                 } else if (req->type == RAW3215_WRITE) {
 420                         raw->count -= req->len;
 421                         raw->written -= req->len;
 422                 }
 423                 raw->flags &= ~RAW3215_WORKING;
 424                 raw3215_free_req(req);
 425                 /* check for empty wait */
 426                 if (waitqueue_active(&raw->empty_wait) &&
 427                     raw->queued_write == NULL &&
 428                     raw->queued_read == NULL) {
 429                         wake_up_interruptible(&raw->empty_wait);
 430                 }
 431                 raw3215_next_io(raw, tty);
 432                 break;
 433         default:
 434                 /* Strange interrupt, I'll do my best to clean up */
 435                 if (req != NULL && req->type != RAW3215_FREE) {
 436                         if (req->type == RAW3215_WRITE) {
 437                                 raw->count -= req->len;
 438                                 raw->written -= req->len;
 439                         }
 440                         raw->flags &= ~RAW3215_WORKING;
 441                         raw3215_free_req(req);
 442                 }
 443                 raw3215_next_io(raw, tty);
 444         }
 445 put_tty:
 446         tty_kref_put(tty);
 447 }
 448
 449 /*
 450  * Wait until length bytes are available int the output buffer.
 451  * Has to be called with the s390irq lock held. Can be called
 452  * disabled.
 453  */
 454 static void raw3215_make_room(struct raw3215_info *raw, unsigned int length)
 455 {
 456         while (RAW3215_BUFFER_SIZE - raw->count < length) {
 457                 /* there might be a request pending */
 458                 raw->flags |= RAW3215_FLUSHING;
 459                 raw3215_mk_write_req(raw);
 460                 raw3215_try_io(raw);
 461                 raw->flags &= ~RAW3215_FLUSHING;
 462 #ifdef CONFIG_TN3215_CONSOLE
 463                 ccw_device_wait_idle(raw->cdev);
 464 #endif
 465                 /* Enough room freed up ? */
 466                 if (RAW3215_BUFFER_SIZE - raw->count >= length)
 467                         break;
 468                 /* there might be another cpu waiting for the lock */
 469                 spin_unlock(get_ccwdev_lock(raw->cdev));
 470                 udelay(100);
 471                 spin_lock(get_ccwdev_lock(raw->cdev));
 472         }
 473 }
 474
 475 /*
 476  * String write routine for 3215 devices
 477  */
 478 static void raw3215_write(struct raw3215_info *raw, const char *str,
 479                           unsigned int length)
 480 {
 481         unsigned long flags;
 482         int c, count;
 483
 484         while (length > 0) {
 485                 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
 486                 count = (length > RAW3215_BUFFER_SIZE) ?
 487                                              RAW3215_BUFFER_SIZE : length;
 488                 length -= count;
 489
 490                 raw3215_make_room(raw, count);
 491
 492                 /* copy string to output buffer and convert it to EBCDIC */
 493                 while (1) {
 494                         c = min_t(int, count,
 495                                   min(RAW3215_BUFFER_SIZE - raw->count,
 496                                       RAW3215_BUFFER_SIZE - raw->head));
 497                         if (c <= 0)
 498                                 break;
 499                         memcpy(raw->buffer + raw->head, str, c);
 500                         ASCEBC(raw->buffer + raw->head, c);
 501                         raw->head = (raw->head + c) & (RAW3215_BUFFER_SIZE - 1);
 502                         raw->count += c;
 503                         raw->line_pos += c;
 504                         str += c;
 505                         count -= c;
 506                 }
 507                 if (!(raw->flags & RAW3215_WORKING)) {
 508                         raw3215_mk_write_req(raw);
 509                         /* start or queue request */
 510                         raw3215_try_io(raw);
 511                 }
 512                 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
 513         }
 514 }
 515
 516 /*
 517  * Put character routine for 3215 devices
 518  */
 519 static void raw3215_putchar(struct raw3215_info *raw, unsigned char ch)
 520 {
 521         unsigned long flags;
 522         unsigned int length, i;
 523
 524         spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
 525         if (ch == '\t') {
 526                 length = TAB_STOP_SIZE - (raw->line_pos%TAB_STOP_SIZE);
 527                 raw->line_pos += length;
 528                 ch = ' ';
 529         } else if (ch == '\n') {
 530                 length = 1;
 531                 raw->line_pos = 0;
 532         } else {
 533                 length = 1;
 534                 raw->line_pos++;
 535         }
 536         raw3215_make_room(raw, length);
 537
 538         for (i = 0; i < length; i++) {
 539                 raw->buffer[raw->head] = (char) _ascebc[(int) ch];
 540                 raw->head = (raw->head + 1) & (RAW3215_BUFFER_SIZE - 1);
 541                 raw->count++;
 542         }
 543         if (!(raw->flags & RAW3215_WORKING)) {
 544                 raw3215_mk_write_req(raw);
 545                 /* start or queue request */
 546                 raw3215_try_io(raw);
 547         }
 548         spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
 549 }
 550
 551 /*
 552  * Flush routine, it simply sets the flush flag and tries to start
 553  * pending IO.
 554  */
 555 static void raw3215_flush_buffer(struct raw3215_info *raw)
 556 {
 557         unsigned long flags;
 558
 559         spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
 560         if (raw->count > 0) {
 561                 raw->flags |= RAW3215_FLUSHING;
 562                 raw3215_try_io(raw);
 563                 raw->flags &= ~RAW3215_FLUSHING;
 564         }
 565         spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
 566 }
 567
 568 /*
 569  * Fire up a 3215 device.
 570  */
 571 static int raw3215_startup(struct raw3215_info *raw)
 572 {
 573         unsigned long flags;
 574
 575         if (tty_port_initialized(&raw->port))
 576                 return 0;
 577         raw->line_pos = 0;
 578         tty_port_set_initialized(&raw->port, 1);
 579         spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
 580         raw3215_try_io(raw);
 581         spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
 582
 583         return 0;
 584 }
 585
 586 /*
 587  * Shutdown a 3215 device.
 588  */
 589 static void raw3215_shutdown(struct raw3215_info *raw)
 590 {
 591         DECLARE_WAITQUEUE(wait, current);
 592         unsigned long flags;
 593
 594         if (!tty_port_initialized(&raw->port) || (raw->flags & RAW3215_FIXED))
 595                 return;
 596         /* Wait for outstanding requests, then free irq */
 597         spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
 598         if ((raw->flags & RAW3215_WORKING) ||
 599             raw->queued_write != NULL ||
 600             raw->queued_read != NULL) {
 601                 add_wait_queue(&raw->empty_wait, &wait);
 602                 set_current_state(TASK_INTERRUPTIBLE);
 603                 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
 604                 schedule();
 605                 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
 606                 remove_wait_queue(&raw->empty_wait, &wait);
 607                 set_current_state(TASK_RUNNING);
 608                 tty_port_set_initialized(&raw->port, 1);
 609         }
 610         spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
 611 }
 612
 613 static struct raw3215_info *raw3215_alloc_info(void)
 614 {
 615         struct raw3215_info *info;
 616
 617         info = kzalloc(sizeof(struct raw3215_info), GFP_KERNEL | GFP_DMA);
 618         if (!info)
 619                 return NULL;
 620
 621         info->buffer = kzalloc(RAW3215_BUFFER_SIZE, GFP_KERNEL | GFP_DMA);
 622         info->inbuf = kzalloc(RAW3215_INBUF_SIZE, GFP_KERNEL | GFP_DMA);
 623         if (!info->buffer || !info->inbuf) {
 624                 kfree(info->inbuf);
 625                 kfree(info->buffer);
 626                 kfree(info);
 627                 return NULL;
 628         }
 629
 630         timer_setup(&info->timer, raw3215_timeout, 0);
 631         init_waitqueue_head(&info->empty_wait);
 632         tty_port_init(&info->port);
 633
 634         return info;
 635 }
 636
 637 static void raw3215_free_info(struct raw3215_info *raw)
 638 {
 639         kfree(raw->inbuf);
 640         kfree(raw->buffer);
 641         tty_port_destroy(&raw->port);
 642         kfree(raw);
 643 }
 644
 645 static int raw3215_probe (struct ccw_device *cdev)
 646 {
 647         struct raw3215_info *raw;
 648         int line;
 649
 650         /* Console is special. */
 651         if (raw3215[0] && (raw3215[0] == dev_get_drvdata(&cdev->dev)))
 652                 return 0;
 653
 654         raw = raw3215_alloc_info();
 655         if (raw == NULL)
 656                 return -ENOMEM;
 657
 658         raw->cdev = cdev;
 659         dev_set_drvdata(&cdev->dev, raw);
 660         cdev->handler = raw3215_irq;
 661
 662         spin_lock(&raw3215_device_lock);
 663         for (line = 0; line < NR_3215; line++) {
 664                 if (!raw3215[line]) {
 665                         raw3215[line] = raw;
 666                         break;
 667                 }
 668         }
 669         spin_unlock(&raw3215_device_lock);
 670         if (line == NR_3215) {
 671                 raw3215_free_info(raw);
 672                 return -ENODEV;
 673         }
 674
 675         return 0;
 676 }
 677
 678 static void raw3215_remove (struct ccw_device *cdev)
 679 {
 680         struct raw3215_info *raw;
 681         unsigned int line;
 682
 683         ccw_device_set_offline(cdev);
 684         raw = dev_get_drvdata(&cdev->dev);
 685         if (raw) {
 686                 spin_lock(&raw3215_device_lock);
 687                 for (line = 0; line < NR_3215; line++)
 688                         if (raw3215[line] == raw)
 689                                 break;
 690                 raw3215[line] = NULL;
 691                 spin_unlock(&raw3215_device_lock);
 692                 dev_set_drvdata(&cdev->dev, NULL);
 693                 raw3215_free_info(raw);
 694         }
 695 }
 696
 697 static int raw3215_set_online (struct ccw_device *cdev)
 698 {
 699         struct raw3215_info *raw;
 700
 701         raw = dev_get_drvdata(&cdev->dev);
 702         if (!raw)
 703                 return -ENODEV;
 704
 705         return raw3215_startup(raw);
 706 }
 707
 708 static int raw3215_set_offline (struct ccw_device *cdev)
 709 {
 710         struct raw3215_info *raw;
 711
 712         raw = dev_get_drvdata(&cdev->dev);
 713         if (!raw)
 714                 return -ENODEV;
 715
 716         raw3215_shutdown(raw);
 717
 718         return 0;
 719 }
 720
 721 static struct ccw_device_id raw3215_id[] = {
 722         { CCW_DEVICE(0x3215, 0) },
 723         { /* end of list */ },
 724 };
 725
 726 static struct ccw_driver raw3215_ccw_driver = {
 727         .driver = {
 728                 .name   = "3215",
 729                 .owner  = THIS_MODULE,
 730         },
 731         .ids            = raw3215_id,
 732         .probe          = &raw3215_probe,
 733         .remove         = &raw3215_remove,
 734         .set_online     = &raw3215_set_online,
 735         .set_offline    = &raw3215_set_offline,
 736         .int_class      = IRQIO_C15,
 737 };
 738
 739 #ifdef CONFIG_TN3215_CONSOLE
 740 /*
 741  * Write a string to the 3215 console
 742  */
 743 static void con3215_write(struct console *co, const char *str,
 744                           unsigned int count)
 745 {
 746         struct raw3215_info *raw;
 747         int i;
 748
 749         if (count <= 0)
 750                 return;
 751         raw = raw3215[0];       /* console 3215 is the first one */
 752         while (count > 0) {
 753                 for (i = 0; i < count; i++)
 754                         if (str[i] == '\t' || str[i] == '\n')
 755                                 break;
 756                 raw3215_write(raw, str, i);
 757                 count -= i;
 758                 str += i;
 759                 if (count > 0) {
 760                         raw3215_putchar(raw, *str);
 761                         count--;
 762                         str++;
 763                 }
 764         }
 765 }
 766
 767 static struct tty_driver *con3215_device(struct console *c, int *index)
 768 {
 769         *index = c->index;
 770         return tty3215_driver;
 771 }
 772
 773 /*
 774  * panic() calls con3215_flush through a panic_notifier
 775  * before the system enters a disabled, endless loop.
 776  */
 777 static void con3215_flush(void)
 778 {
 779         struct raw3215_info *raw;
 780         unsigned long flags;
 781
 782         raw = raw3215[0];  /* console 3215 is the first one */
 783         spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
 784         raw3215_make_room(raw, RAW3215_BUFFER_SIZE);
 785         spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
 786 }
 787
 788 static int con3215_notify(struct notifier_block *self,
 789                           unsigned long event, void *data)
 790 {
 791         con3215_flush();
 792         return NOTIFY_OK;
 793 }
 794
 795 static struct notifier_block on_panic_nb = {
 796         .notifier_call = con3215_notify,
 797         .priority = 0,
 798 };
 799
 800 static struct notifier_block on_reboot_nb = {
 801         .notifier_call = con3215_notify,
 802         .priority = 0,
 803 };
 804
 805 /*
 806  *  The console structure for the 3215 console
 807  */
 808 static struct console con3215 = {
 809         .name    = "ttyS",
 810         .write   = con3215_write,
 811         .device  = con3215_device,
 812         .flags   = CON_PRINTBUFFER,
 813 };
 814
 815 /*
 816  * 3215 console initialization code called from console_init().
 817  */
 818 static int __init con3215_init(void)
 819 {
 820         struct ccw_device *cdev;
 821         struct raw3215_info *raw;
 822         struct raw3215_req *req;
 823         int i;
 824
 825         /* Check if 3215 is to be the console */
 826         if (!CONSOLE_IS_3215)
 827                 return -ENODEV;
 828
 829         /* Set the console mode for VM */
 830         if (MACHINE_IS_VM) {
 831                 cpcmd("TERM CONMODE 3215", NULL, 0, NULL);
 832                 cpcmd("TERM AUTOCR OFF", NULL, 0, NULL);
 833         }
 834
 835         /* allocate 3215 request structures */
 836         raw3215_freelist = NULL;
 837         for (i = 0; i < NR_3215_REQ; i++) {
 838                 req = kzalloc(sizeof(struct raw3215_req), GFP_KERNEL | GFP_DMA);
 839                 if (!req)
 840                         return -ENOMEM;
 841                 req->next = raw3215_freelist;
 842                 raw3215_freelist = req;
 843         }
 844
 845         cdev = ccw_device_create_console(&raw3215_ccw_driver);
 846         if (IS_ERR(cdev))
 847                 return -ENODEV;
 848
 849         raw3215[0] = raw = raw3215_alloc_info();
 850         raw->cdev = cdev;
 851         dev_set_drvdata(&cdev->dev, raw);
 852         cdev->handler = raw3215_irq;
 853
 854         raw->flags |= RAW3215_FIXED;
 855         if (ccw_device_enable_console(cdev)) {
 856                 ccw_device_destroy_console(cdev);
 857                 raw3215_free_info(raw);
 858                 raw3215[0] = NULL;
 859                 return -ENODEV;
 860         }
 861
 862         /* Request the console irq */
 863         if (raw3215_startup(raw) != 0) {
 864                 raw3215_free_info(raw);
 865                 raw3215[0] = NULL;
 866                 return -ENODEV;
 867         }
 868         atomic_notifier_chain_register(&panic_notifier_list, &on_panic_nb);
 869         register_reboot_notifier(&on_reboot_nb);
 870         register_console(&con3215);
 871         return 0;
 872 }
 873 console_initcall(con3215_init);
 874 #endif
 875
 876 static int tty3215_install(struct tty_driver *driver, struct tty_struct *tty)
 877 {
 878         struct raw3215_info *raw;
 879
 880         raw = raw3215[tty->index];
 881         if (raw == NULL)
 882                 return -ENODEV;
 883
 884         tty->driver_data = raw;
 885
 886         return tty_port_install(&raw->port, driver, tty);
 887 }
 888
 889 /*
 890  * tty3215_open
 891  *
 892  * This routine is called whenever a 3215 tty is opened.
 893  */
 894 static int tty3215_open(struct tty_struct *tty, struct file * filp)
 895 {
 896         struct raw3215_info *raw = tty->driver_data;
 897
 898         tty_port_tty_set(&raw->port, tty);
 899
 900         /*
 901          * Start up 3215 device
 902          */
 903         return raw3215_startup(raw);
 904 }
 905
 906 /*
 907  * tty3215_close()
 908  *
 909  * This routine is called when the 3215 tty is closed. We wait
 910  * for the remaining request to be completed. Then we clean up.
 911  */
 912 static void tty3215_close(struct tty_struct *tty, struct file * filp)
 913 {
 914         struct raw3215_info *raw = tty->driver_data;
 915
 916         if (raw == NULL || tty->count > 1)
 917                 return;
 918         tty->closing = 1;
 919         /* Shutdown the terminal */
 920         raw3215_shutdown(raw);
 921         tty->closing = 0;
 922         tty_port_tty_set(&raw->port, NULL);
 923 }
 924
 925 /*
 926  * Returns the amount of free space in the output buffer.
 927  */
 928 static unsigned int tty3215_write_room(struct tty_struct *tty)
 929 {
 930         struct raw3215_info *raw = tty->driver_data;
 931
 932         /* Subtract TAB_STOP_SIZE to allow for a tab, 8 <<< 64K */
 933         if ((RAW3215_BUFFER_SIZE - raw->count - TAB_STOP_SIZE) >= 0)
 934                 return RAW3215_BUFFER_SIZE - raw->count - TAB_STOP_SIZE;
 935         else
 936                 return 0;
 937 }
 938
 939 /*
 940  * String write routine for 3215 ttys
 941  */
 942 static int tty3215_write(struct tty_struct * tty,
 943                          const unsigned char *buf, int count)
 944 {
 945         struct raw3215_info *raw = tty->driver_data;
 946         int i, written;
 947
 948         written = count;
 949         while (count > 0) {
 950                 for (i = 0; i < count; i++)
 951                         if (buf[i] == '\t' || buf[i] == '\n')
 952                                 break;
 953                 raw3215_write(raw, buf, i);
 954                 count -= i;
 955                 buf += i;
 956                 if (count > 0) {
 957                         raw3215_putchar(raw, *buf);
 958                         count--;
 959                         buf++;
 960                 }
 961         }
 962         return written;
 963 }
 964
 965 /*
 966  * Put character routine for 3215 ttys
 967  */
 968 static int tty3215_put_char(struct tty_struct *tty, unsigned char ch)
 969 {
 970         struct raw3215_info *raw = tty->driver_data;
 971
 972         raw3215_putchar(raw, ch);
 973
 974         return 1;
 975 }
 976
 977 static void tty3215_flush_chars(struct tty_struct *tty)
 978 {
 979 }
 980
 981 /*
 982  * Returns the number of characters in the output buffer
 983  */
 984 static unsigned int tty3215_chars_in_buffer(struct tty_struct *tty)
 985 {
 986         struct raw3215_info *raw = tty->driver_data;
 987
 988         return raw->count;
 989 }
 990
 991 static void tty3215_flush_buffer(struct tty_struct *tty)
 992 {
 993         struct raw3215_info *raw = tty->driver_data;
 994
 995         raw3215_flush_buffer(raw);
 996         tty_wakeup(tty);
 997 }
 998
 999 /*
1000  * Disable reading from a 3215 tty
1001  */
1002 static void tty3215_throttle(struct tty_struct * tty)
1003 {
1004         struct raw3215_info *raw = tty->driver_data;
1005
1006         raw->flags |= RAW3215_THROTTLED;
1007 }
1008
1009 /*
1010  * Enable reading from a 3215 tty
1011  */
1012 static void tty3215_unthrottle(struct tty_struct * tty)
1013 {
1014         struct raw3215_info *raw = tty->driver_data;
1015         unsigned long flags;
1016
1017         if (raw->flags & RAW3215_THROTTLED) {
1018                 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
1019                 raw->flags &= ~RAW3215_THROTTLED;
1020                 raw3215_try_io(raw);
1021                 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
1022         }
1023 }
1024
1025 /*
1026  * Disable writing to a 3215 tty
1027  */
1028 static void tty3215_stop(struct tty_struct *tty)
1029 {
1030         struct raw3215_info *raw = tty->driver_data;
1031
1032         raw->flags |= RAW3215_STOPPED;
1033 }
1034
1035 /*
1036  * Enable writing to a 3215 tty
1037  */
1038 static void tty3215_start(struct tty_struct *tty)
1039 {
1040         struct raw3215_info *raw = tty->driver_data;
1041         unsigned long flags;
1042
1043         if (raw->flags & RAW3215_STOPPED) {
1044                 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
1045                 raw->flags &= ~RAW3215_STOPPED;
1046                 raw3215_try_io(raw);
1047                 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
1048         }
1049 }
1050
1051 static const struct tty_operations tty3215_ops = {
1052         .install = tty3215_install,
1053         .open = tty3215_open,
1054         .close = tty3215_close,
1055         .write = tty3215_write,
1056         .put_char = tty3215_put_char,
1057         .flush_chars = tty3215_flush_chars,
1058         .write_room = tty3215_write_room,
1059         .chars_in_buffer = tty3215_chars_in_buffer,
1060         .flush_buffer = tty3215_flush_buffer,
1061         .throttle = tty3215_throttle,
1062         .unthrottle = tty3215_unthrottle,
1063         .stop = tty3215_stop,
1064         .start = tty3215_start,
1065 };
1066
1067 /*
1068  * 3215 tty registration code called from tty_init().
1069  * Most kernel services (incl. kmalloc) are available at this poimt.
1070  */
1071 static int __init tty3215_init(void)
1072 {
1073         struct tty_driver *driver;
1074         int ret;
1075
1076         if (!CONSOLE_IS_3215)
1077                 return 0;
1078
1079         driver = tty_alloc_driver(NR_3215, TTY_DRIVER_REAL_RAW);
1080         if (IS_ERR(driver))
1081                 return PTR_ERR(driver);
1082
1083         ret = ccw_driver_register(&raw3215_ccw_driver);
1084         if (ret) {
1085                 tty_driver_kref_put(driver);
1086                 return ret;
1087         }
1088         /*
1089          * Initialize the tty_driver structure
1090          * Entries in tty3215_driver that are NOT initialized:
1091          * proc_entry, set_termios, flush_buffer, set_ldisc, write_proc
1092          */
1093
1094         driver->driver_name = "tty3215";
1095         driver->name = "ttyS";
1096         driver->major = TTY_MAJOR;
1097         driver->minor_start = 64;
1098         driver->type = TTY_DRIVER_TYPE_SYSTEM;
1099         driver->subtype = SYSTEM_TYPE_TTY;
1100         driver->init_termios = tty_std_termios;
1101         driver->init_termios.c_iflag = IGNBRK | IGNPAR;
1102         driver->init_termios.c_oflag = ONLCR;
1103         driver->init_termios.c_lflag = ISIG;
1104         tty_set_operations(driver, &tty3215_ops);
1105         ret = tty_register_driver(driver);
1106         if (ret) {
1107                 tty_driver_kref_put(driver);
1108                 return ret;
1109         }
1110         tty3215_driver = driver;
1111         return 0;
1112 }
1113 device_initcall(tty3215_init);