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/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 <linux/uaccess.h>
  30 #include <asm/delay.h>
  31 #include <asm/cpcmd.h>
  32 #include <asm/setup.h>
  33
  34 #include "ctrlchar.h"
  35
  36 #define NR_3215             1
  37 #define NR_3215_REQ         (4*NR_3215)
  38 #define RAW3215_BUFFER_SIZE 65536     /* output buffer size */
  39 #define RAW3215_INBUF_SIZE  256       /* input buffer size */
  40 #define RAW3215_MIN_SPACE   128       /* minimum free space for wakeup */
  41 #define RAW3215_MIN_WRITE   1024      /* min. length for immediate output */
  42 #define RAW3215_MAX_BYTES   3968      /* max. bytes to write with one ssch */
  43 #define RAW3215_MAX_NEWLINE 50        /* max. lines to write with one ssch */
  44 #define RAW3215_NR_CCWS     3
  45 #define RAW3215_TIMEOUT     HZ/10     /* time for delayed output */
  46
  47 #define RAW3215_FIXED       1         /* 3215 console device is not be freed */
  48 #define RAW3215_WORKING     4         /* set if a request is being worked on */
  49 #define RAW3215_THROTTLED   8         /* set if reading is disabled */
  50 #define RAW3215_STOPPED     16        /* set if writing is disabled */
  51 #define RAW3215_TIMER_RUNS  64        /* set if the output delay timer is on */
  52 #define RAW3215_FLUSHING    128       /* set to flush buffer (no delay) */
  53
  54 #define TAB_STOP_SIZE       8         /* tab stop size */
  55
  56 /*
  57  * Request types for a 3215 device
  58  */
  59 enum raw3215_type {
  60         RAW3215_FREE, RAW3215_READ, RAW3215_WRITE
  61 };
  62
  63 /*
  64  * Request structure for a 3215 device
  65  */
  66 struct raw3215_req {
  67         enum raw3215_type type;       /* type of the request */
  68         int start, len;               /* start index & len in output buffer */
  69         int delayable;                /* indication to wait for more data */
  70         int residual;                 /* residual count for read request */
  71         struct ccw1 ccws[RAW3215_NR_CCWS]; /* space for the channel program */
  72         struct raw3215_info *info;    /* pointer to main structure */
  73         struct raw3215_req *next;     /* pointer to next request */
  74 } __attribute__ ((aligned(8)));
  75
  76 struct raw3215_info {
  77         struct tty_port port;
  78         struct ccw_device *cdev;      /* device for tty driver */
  79         spinlock_t *lock;             /* pointer to irq lock */
  80         int flags;                    /* state flags */
  81         char *buffer;                 /* pointer to output buffer */
  82         char *inbuf;                  /* pointer to input buffer */
  83         int head;                     /* first free byte in output buffer */
  84         int count;                    /* number of bytes in output buffer */
  85         int written;                  /* number of bytes in write requests */
  86         struct raw3215_req *queued_read; /* pointer to queued read requests */
  87         struct raw3215_req *queued_write;/* pointer to queued write requests */
  88         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 DEFINE_SPINLOCK(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(struct timer_list *t)
 285 {
 286         struct raw3215_info *raw = from_timer(raw, t, timer);
 287         unsigned long flags;
 288
 289         spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
 290         raw->flags &= ~RAW3215_TIMER_RUNS;
 291         raw3215_mk_write_req(raw);
 292         raw3215_start_io(raw);
 293         if ((raw->queued_read || raw->queued_write) &&
 294             !(raw->flags & RAW3215_WORKING) &&
 295             !(raw->flags & RAW3215_TIMER_RUNS)) {
 296                 raw->timer.expires = RAW3215_TIMEOUT + jiffies;
 297                 add_timer(&raw->timer);
 298                 raw->flags |= RAW3215_TIMER_RUNS;
 299         }
 300         spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
 301 }
 302
 303 /*
 304  * Function to conditionally start an IO. A read is started immediately,
 305  * a write is only started immediately if the flush flag is on or the
 306  * amount of data is bigger than RAW3215_MIN_WRITE. If a write is not
 307  * done immediately a timer is started with a delay of RAW3215_TIMEOUT.
 308  */
 309 static inline void raw3215_try_io(struct raw3215_info *raw)
 310 {
 311         if (!tty_port_initialized(&raw->port))
 312                 return;
 313         if (raw->queued_read != NULL)
 314                 raw3215_start_io(raw);
 315         else if (raw->queued_write != NULL) {
 316                 if ((raw->queued_write->delayable == 0) ||
 317                     (raw->flags & RAW3215_FLUSHING)) {
 318                         /* execute write requests bigger than minimum size */
 319                         raw3215_start_io(raw);
 320                 }
 321         }
 322         if ((raw->queued_read || raw->queued_write) &&
 323             !(raw->flags & RAW3215_WORKING) &&
 324             !(raw->flags & RAW3215_TIMER_RUNS)) {
 325                 raw->timer.expires = RAW3215_TIMEOUT + jiffies;
 326                 add_timer(&raw->timer);
 327                 raw->flags |= RAW3215_TIMER_RUNS;
 328         }
 329 }
 330
 331 /*
 332  * Try to start the next IO and wake up processes waiting on the tty.
 333  */
 334 static void raw3215_next_io(struct raw3215_info *raw, struct tty_struct *tty)
 335 {
 336         raw3215_mk_write_req(raw);
 337         raw3215_try_io(raw);
 338         if (tty && RAW3215_BUFFER_SIZE - raw->count >= RAW3215_MIN_SPACE)
 339                 tty_wakeup(tty);
 340 }
 341
 342 /*
 343  * Interrupt routine, called from common io layer
 344  */
 345 static void raw3215_irq(struct ccw_device *cdev, unsigned long intparm,
 346                         struct irb *irb)
 347 {
 348         struct raw3215_info *raw;
 349         struct raw3215_req *req;
 350         struct tty_struct *tty;
 351         int cstat, dstat;
 352         int count;
 353
 354         raw = dev_get_drvdata(&cdev->dev);
 355         req = (struct raw3215_req *) intparm;
 356         tty = tty_port_tty_get(&raw->port);
 357         cstat = irb->scsw.cmd.cstat;
 358         dstat = irb->scsw.cmd.dstat;
 359         if (cstat != 0)
 360                 raw3215_next_io(raw, tty);
 361         if (dstat & 0x01) { /* we got a unit exception */
 362                 dstat &= ~0x01;  /* we can ignore it */
 363         }
 364         switch (dstat) {
 365         case 0x80:
 366                 if (cstat != 0)
 367                         break;
 368                 /* Attention interrupt, someone hit the enter key */
 369                 raw3215_mk_read_req(raw);
 370                 raw3215_next_io(raw, tty);
 371                 break;
 372         case 0x08:
 373         case 0x0C:
 374                 /* Channel end interrupt. */
 375                 if ((raw = req->info) == NULL)
 376                         goto put_tty;        /* That shouldn't happen ... */
 377                 if (req->type == RAW3215_READ) {
 378                         /* store residual count, then wait for device end */
 379                         req->residual = irb->scsw.cmd.count;
 380                 }
 381                 if (dstat == 0x08)
 382                         break;
 383                 fallthrough;
 384         case 0x04:
 385                 /* Device end interrupt. */
 386                 if ((raw = req->info) == NULL)
 387                         goto put_tty;        /* That shouldn't happen ... */
 388                 if (req->type == RAW3215_READ && tty != NULL) {
 389                         unsigned int cchar;
 390
 391                         count = 160 - req->residual;
 392                         EBCASC(raw->inbuf, count);
 393                         cchar = ctrlchar_handle(raw->inbuf, count, tty);
 394                         switch (cchar & CTRLCHAR_MASK) {
 395                         case CTRLCHAR_SYSRQ:
 396                                 break;
 397
 398                         case CTRLCHAR_CTRL:
 399                                 tty_insert_flip_char(&raw->port, cchar,
 400                                                 TTY_NORMAL);
 401                                 tty_flip_buffer_push(&raw->port);
 402                                 break;
 403
 404                         case CTRLCHAR_NONE:
 405                                 if (count < 2 ||
 406                                     (strncmp(raw->inbuf+count-2, "\252n", 2) &&
 407                                      strncmp(raw->inbuf+count-2, "^n", 2)) ) {
 408                                         /* add the auto \n */
 409                                         raw->inbuf[count] = '\n';
 410                                         count++;
 411                                 } else
 412                                         count -= 2;
 413                                 tty_insert_flip_string(&raw->port, raw->inbuf,
 414                                                 count);
 415                                 tty_flip_buffer_push(&raw->port);
 416                                 break;
 417                         }
 418                 } else if (req->type == RAW3215_WRITE) {
 419                         raw->count -= req->len;
 420                         raw->written -= req->len;
 421                 }
 422                 raw->flags &= ~RAW3215_WORKING;
 423                 raw3215_free_req(req);
 424                 /* check for empty wait */
 425                 if (waitqueue_active(&raw->empty_wait) &&
 426                     raw->queued_write == NULL &&
 427                     raw->queued_read == NULL) {
 428                         wake_up_interruptible(&raw->empty_wait);
 429                 }
 430                 raw3215_next_io(raw, tty);
 431                 break;
 432         default:
 433                 /* Strange interrupt, I'll do my best to clean up */
 434                 if (req != NULL && req->type != RAW3215_FREE) {
 435                         if (req->type == RAW3215_WRITE) {
 436                                 raw->count -= req->len;
 437                                 raw->written -= req->len;
 438                         }
 439                         raw->flags &= ~RAW3215_WORKING;
 440                         raw3215_free_req(req);
 441                 }
 442                 raw3215_next_io(raw, tty);
 443         }
 444 put_tty:
 445         tty_kref_put(tty);
 446 }
 447
 448 /*
 449  * Wait until length bytes are available int the output buffer.
 450  * Has to be called with the s390irq lock held. Can be called
 451  * disabled.
 452  */
 453 static void raw3215_make_room(struct raw3215_info *raw, unsigned int length)
 454 {
 455         while (RAW3215_BUFFER_SIZE - raw->count < length) {
 456                 /* there might be a request pending */
 457                 raw->flags |= RAW3215_FLUSHING;
 458                 raw3215_mk_write_req(raw);
 459                 raw3215_try_io(raw);
 460                 raw->flags &= ~RAW3215_FLUSHING;
 461 #ifdef CONFIG_TN3215_CONSOLE
 462                 ccw_device_wait_idle(raw->cdev);
 463 #endif
 464                 /* Enough room freed up ? */
 465                 if (RAW3215_BUFFER_SIZE - raw->count >= length)
 466                         break;
 467                 /* there might be another cpu waiting for the lock */
 468                 spin_unlock(get_ccwdev_lock(raw->cdev));
 469                 udelay(100);
 470                 spin_lock(get_ccwdev_lock(raw->cdev));
 471         }
 472 }
 473
 474 /*
 475  * String write routine for 3215 devices
 476  */
 477 static void raw3215_write(struct raw3215_info *raw, const char *str,
 478                           unsigned int length)
 479 {
 480         unsigned long flags;
 481         int c, count;
 482
 483         while (length > 0) {
 484                 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
 485                 count = (length > RAW3215_BUFFER_SIZE) ?
 486                                              RAW3215_BUFFER_SIZE : length;
 487                 length -= count;
 488
 489                 raw3215_make_room(raw, count);
 490
 491                 /* copy string to output buffer and convert it to EBCDIC */
 492                 while (1) {
 493                         c = min_t(int, count,
 494                                   min(RAW3215_BUFFER_SIZE - raw->count,
 495                                       RAW3215_BUFFER_SIZE - raw->head));
 496                         if (c <= 0)
 497                                 break;
 498                         memcpy(raw->buffer + raw->head, str, c);
 499                         ASCEBC(raw->buffer + raw->head, c);
 500                         raw->head = (raw->head + c) & (RAW3215_BUFFER_SIZE - 1);
 501                         raw->count += c;
 502                         raw->line_pos += c;
 503                         str += c;
 504                         count -= c;
 505                 }
 506                 if (!(raw->flags & RAW3215_WORKING)) {
 507                         raw3215_mk_write_req(raw);
 508                         /* start or queue request */
 509                         raw3215_try_io(raw);
 510                 }
 511                 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
 512         }
 513 }
 514
 515 /*
 516  * Put character routine for 3215 devices
 517  */
 518 static void raw3215_putchar(struct raw3215_info *raw, unsigned char ch)
 519 {
 520         unsigned long flags;
 521         unsigned int length, i;
 522
 523         spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
 524         if (ch == '\t') {
 525                 length = TAB_STOP_SIZE - (raw->line_pos%TAB_STOP_SIZE);
 526                 raw->line_pos += length;
 527                 ch = ' ';
 528         } else if (ch == '\n') {
 529                 length = 1;
 530                 raw->line_pos = 0;
 531         } else {
 532                 length = 1;
 533                 raw->line_pos++;
 534         }
 535         raw3215_make_room(raw, length);
 536
 537         for (i = 0; i < length; i++) {
 538                 raw->buffer[raw->head] = (char) _ascebc[(int) ch];
 539                 raw->head = (raw->head + 1) & (RAW3215_BUFFER_SIZE - 1);
 540                 raw->count++;
 541         }
 542         if (!(raw->flags & RAW3215_WORKING)) {
 543                 raw3215_mk_write_req(raw);
 544                 /* start or queue request */
 545                 raw3215_try_io(raw);
 546         }
 547         spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
 548 }
 549
 550 /*
 551  * Flush routine, it simply sets the flush flag and tries to start
 552  * pending IO.
 553  */
 554 static void raw3215_flush_buffer(struct raw3215_info *raw)
 555 {
 556         unsigned long flags;
 557
 558         spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
 559         if (raw->count > 0) {
 560                 raw->flags |= RAW3215_FLUSHING;
 561                 raw3215_try_io(raw);
 562                 raw->flags &= ~RAW3215_FLUSHING;
 563         }
 564         spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
 565 }
 566
 567 /*
 568  * Fire up a 3215 device.
 569  */
 570 static int raw3215_startup(struct raw3215_info *raw)
 571 {
 572         unsigned long flags;
 573
 574         if (tty_port_initialized(&raw->port))
 575                 return 0;
 576         raw->line_pos = 0;
 577         tty_port_set_initialized(&raw->port, 1);
 578         spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
 579         raw3215_try_io(raw);
 580         spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
 581
 582         return 0;
 583 }
 584
 585 /*
 586  * Shutdown a 3215 device.
 587  */
 588 static void raw3215_shutdown(struct raw3215_info *raw)
 589 {
 590         DECLARE_WAITQUEUE(wait, current);
 591         unsigned long flags;
 592
 593         if (!tty_port_initialized(&raw->port) || (raw->flags & RAW3215_FIXED))
 594                 return;
 595         /* Wait for outstanding requests, then free irq */
 596         spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
 597         if ((raw->flags & RAW3215_WORKING) ||
 598             raw->queued_write != NULL ||
 599             raw->queued_read != NULL) {
 600                 add_wait_queue(&raw->empty_wait, &wait);
 601                 set_current_state(TASK_INTERRUPTIBLE);
 602                 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
 603                 schedule();
 604                 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
 605                 remove_wait_queue(&raw->empty_wait, &wait);
 606                 set_current_state(TASK_RUNNING);
 607                 tty_port_set_initialized(&raw->port, 1);
 608         }
 609         spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
 610 }
 611
 612 static struct raw3215_info *raw3215_alloc_info(void)
 613 {
 614         struct raw3215_info *info;
 615
 616         info = kzalloc(sizeof(struct raw3215_info), GFP_KERNEL | GFP_DMA);
 617         if (!info)
 618                 return NULL;
 619
 620         info->buffer = kzalloc(RAW3215_BUFFER_SIZE, GFP_KERNEL | GFP_DMA);
 621         info->inbuf = kzalloc(RAW3215_INBUF_SIZE, GFP_KERNEL | GFP_DMA);
 622         if (!info->buffer || !info->inbuf) {
 623                 kfree(info->inbuf);
 624                 kfree(info->buffer);
 625                 kfree(info);
 626                 return NULL;
 627         }
 628
 629         timer_setup(&info->timer, raw3215_timeout, 0);
 630         init_waitqueue_head(&info->empty_wait);
 631         tty_port_init(&info->port);
 632
 633         return info;
 634 }
 635
 636 static void raw3215_free_info(struct raw3215_info *raw)
 637 {
 638         kfree(raw->inbuf);
 639         kfree(raw->buffer);
 640         tty_port_destroy(&raw->port);
 641         kfree(raw);
 642 }
 643
 644 static int raw3215_probe (struct ccw_device *cdev)
 645 {
 646         struct raw3215_info *raw;
 647         int line;
 648
 649         /* Console is special. */
 650         if (raw3215[0] && (raw3215[0] == dev_get_drvdata(&cdev->dev)))
 651                 return 0;
 652
 653         raw = raw3215_alloc_info();
 654         if (raw == NULL)
 655                 return -ENOMEM;
 656
 657         raw->cdev = cdev;
 658         dev_set_drvdata(&cdev->dev, raw);
 659         cdev->handler = raw3215_irq;
 660
 661         spin_lock(&raw3215_device_lock);
 662         for (line = 0; line < NR_3215; line++) {
 663                 if (!raw3215[line]) {
 664                         raw3215[line] = raw;
 665                         break;
 666                 }
 667         }
 668         spin_unlock(&raw3215_device_lock);
 669         if (line == NR_3215) {
 670                 raw3215_free_info(raw);
 671                 return -ENODEV;
 672         }
 673
 674         return 0;
 675 }
 676
 677 static void raw3215_remove (struct ccw_device *cdev)
 678 {
 679         struct raw3215_info *raw;
 680         unsigned int line;
 681
 682         ccw_device_set_offline(cdev);
 683         raw = dev_get_drvdata(&cdev->dev);
 684         if (raw) {
 685                 spin_lock(&raw3215_device_lock);
 686                 for (line = 0; line < NR_3215; line++)
 687                         if (raw3215[line] == raw)
 688                                 break;
 689                 raw3215[line] = NULL;
 690                 spin_unlock(&raw3215_device_lock);
 691                 dev_set_drvdata(&cdev->dev, NULL);
 692                 raw3215_free_info(raw);
 693         }
 694 }
 695
 696 static int raw3215_set_online (struct ccw_device *cdev)
 697 {
 698         struct raw3215_info *raw;
 699
 700         raw = dev_get_drvdata(&cdev->dev);
 701         if (!raw)
 702                 return -ENODEV;
 703
 704         return raw3215_startup(raw);
 705 }
 706
 707 static int raw3215_set_offline (struct ccw_device *cdev)
 708 {
 709         struct raw3215_info *raw;
 710
 711         raw = dev_get_drvdata(&cdev->dev);
 712         if (!raw)
 713                 return -ENODEV;
 714
 715         raw3215_shutdown(raw);
 716
 717         return 0;
 718 }
 719
 720 static struct ccw_device_id raw3215_id[] = {
 721         { CCW_DEVICE(0x3215, 0) },
 722         { /* end of list */ },
 723 };
 724
 725 static struct ccw_driver raw3215_ccw_driver = {
 726         .driver = {
 727                 .name   = "3215",
 728                 .owner  = THIS_MODULE,
 729         },
 730         .ids            = raw3215_id,
 731         .probe          = &raw3215_probe,
 732         .remove         = &raw3215_remove,
 733         .set_online     = &raw3215_set_online,
 734         .set_offline    = &raw3215_set_offline,
 735         .int_class      = IRQIO_C15,
 736 };
 737
 738 #ifdef CONFIG_TN3215_CONSOLE
 739 /*
 740  * Write a string to the 3215 console
 741  */
 742 static void con3215_write(struct console *co, const char *str,
 743                           unsigned int count)
 744 {
 745         struct raw3215_info *raw;
 746         int i;
 747
 748         if (count <= 0)
 749                 return;
 750         raw = raw3215[0];       /* console 3215 is the first one */
 751         while (count > 0) {
 752                 for (i = 0; i < count; i++)
 753                         if (str[i] == '\t' || str[i] == '\n')
 754                                 break;
 755                 raw3215_write(raw, str, i);
 756                 count -= i;
 757                 str += i;
 758                 if (count > 0) {
 759                         raw3215_putchar(raw, *str);
 760                         count--;
 761                         str++;
 762                 }
 763         }
 764 }
 765
 766 static struct tty_driver *con3215_device(struct console *c, int *index)
 767 {
 768         *index = c->index;
 769         return tty3215_driver;
 770 }
 771
 772 /*
 773  * panic() calls con3215_flush through a panic_notifier
 774  * before the system enters a disabled, endless loop.
 775  */
 776 static void con3215_flush(void)
 777 {
 778         struct raw3215_info *raw;
 779         unsigned long flags;
 780
 781         raw = raw3215[0];  /* console 3215 is the first one */
 782         spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
 783         raw3215_make_room(raw, RAW3215_BUFFER_SIZE);
 784         spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
 785 }
 786
 787 static int con3215_notify(struct notifier_block *self,
 788                           unsigned long event, void *data)
 789 {
 790         con3215_flush();
 791         return NOTIFY_OK;
 792 }
 793
 794 static struct notifier_block on_panic_nb = {
 795         .notifier_call = con3215_notify,
 796         .priority = 0,
 797 };
 798
 799 static struct notifier_block on_reboot_nb = {
 800         .notifier_call = con3215_notify,
 801         .priority = 0,
 802 };
 803
 804 /*
 805  *  The console structure for the 3215 console
 806  */
 807 static struct console con3215 = {
 808         .name    = "ttyS",
 809         .write   = con3215_write,
 810         .device  = con3215_device,
 811         .flags   = CON_PRINTBUFFER,
 812 };
 813
 814 /*
 815  * 3215 console initialization code called from console_init().
 816  */
 817 static int __init con3215_init(void)
 818 {
 819         struct ccw_device *cdev;
 820         struct raw3215_info *raw;
 821         struct raw3215_req *req;
 822         int i;
 823
 824         /* Check if 3215 is to be the console */
 825         if (!CONSOLE_IS_3215)
 826                 return -ENODEV;
 827
 828         /* Set the console mode for VM */
 829         if (MACHINE_IS_VM) {
 830                 cpcmd("TERM CONMODE 3215", NULL, 0, NULL);
 831                 cpcmd("TERM AUTOCR OFF", NULL, 0, NULL);
 832         }
 833
 834         /* allocate 3215 request structures */
 835         raw3215_freelist = NULL;
 836         for (i = 0; i < NR_3215_REQ; i++) {
 837                 req = kzalloc(sizeof(struct raw3215_req), GFP_KERNEL | GFP_DMA);
 838                 if (!req)
 839                         return -ENOMEM;
 840                 req->next = raw3215_freelist;
 841                 raw3215_freelist = req;
 842         }
 843
 844         cdev = ccw_device_create_console(&raw3215_ccw_driver);
 845         if (IS_ERR(cdev))
 846                 return -ENODEV;
 847
 848         raw3215[0] = raw = raw3215_alloc_info();
 849         raw->cdev = cdev;
 850         dev_set_drvdata(&cdev->dev, raw);
 851         cdev->handler = raw3215_irq;
 852
 853         raw->flags |= RAW3215_FIXED;
 854         if (ccw_device_enable_console(cdev)) {
 855                 ccw_device_destroy_console(cdev);
 856                 raw3215_free_info(raw);
 857                 raw3215[0] = NULL;
 858                 return -ENODEV;
 859         }
 860
 861         /* Request the console irq */
 862         if (raw3215_startup(raw) != 0) {
 863                 raw3215_free_info(raw);
 864                 raw3215[0] = NULL;
 865                 return -ENODEV;
 866         }
 867         atomic_notifier_chain_register(&panic_notifier_list, &on_panic_nb);
 868         register_reboot_notifier(&on_reboot_nb);
 869         register_console(&con3215);
 870         return 0;
 871 }
 872 console_initcall(con3215_init);
 873 #endif
 874
 875 static int tty3215_install(struct tty_driver *driver, struct tty_struct *tty)
 876 {
 877         struct raw3215_info *raw;
 878
 879         raw = raw3215[tty->index];
 880         if (raw == NULL)
 881                 return -ENODEV;
 882
 883         tty->driver_data = raw;
 884
 885         return tty_port_install(&raw->port, driver, tty);
 886 }
 887
 888 /*
 889  * tty3215_open
 890  *
 891  * This routine is called whenever a 3215 tty is opened.
 892  */
 893 static int tty3215_open(struct tty_struct *tty, struct file * filp)
 894 {
 895         struct raw3215_info *raw = tty->driver_data;
 896
 897         tty_port_tty_set(&raw->port, tty);
 898
 899         /*
 900          * Start up 3215 device
 901          */
 902         return raw3215_startup(raw);
 903 }
 904
 905 /*
 906  * tty3215_close()
 907  *
 908  * This routine is called when the 3215 tty is closed. We wait
 909  * for the remaining request to be completed. Then we clean up.
 910  */
 911 static void tty3215_close(struct tty_struct *tty, struct file * filp)
 912 {
 913         struct raw3215_info *raw = tty->driver_data;
 914
 915         if (raw == NULL || tty->count > 1)
 916                 return;
 917         tty->closing = 1;
 918         /* Shutdown the terminal */
 919         raw3215_shutdown(raw);
 920         tty->closing = 0;
 921         tty_port_tty_set(&raw->port, NULL);
 922 }
 923
 924 /*
 925  * Returns the amount of free space in the output buffer.
 926  */
 927 static int tty3215_write_room(struct tty_struct *tty)
 928 {
 929         struct raw3215_info *raw = tty->driver_data;
 930
 931         /* Subtract TAB_STOP_SIZE to allow for a tab, 8 <<< 64K */
 932         if ((RAW3215_BUFFER_SIZE - raw->count - TAB_STOP_SIZE) >= 0)
 933                 return RAW3215_BUFFER_SIZE - raw->count - TAB_STOP_SIZE;
 934         else
 935                 return 0;
 936 }
 937
 938 /*
 939  * String write routine for 3215 ttys
 940  */
 941 static int tty3215_write(struct tty_struct * tty,
 942                          const unsigned char *buf, int count)
 943 {
 944         struct raw3215_info *raw = tty->driver_data;
 945         int i, written;
 946
 947         written = count;
 948         while (count > 0) {
 949                 for (i = 0; i < count; i++)
 950                         if (buf[i] == '\t' || buf[i] == '\n')
 951                                 break;
 952                 raw3215_write(raw, buf, i);
 953                 count -= i;
 954                 buf += i;
 955                 if (count > 0) {
 956                         raw3215_putchar(raw, *buf);
 957                         count--;
 958                         buf++;
 959                 }
 960         }
 961         return written;
 962 }
 963
 964 /*
 965  * Put character routine for 3215 ttys
 966  */
 967 static int tty3215_put_char(struct tty_struct *tty, unsigned char ch)
 968 {
 969         struct raw3215_info *raw = tty->driver_data;
 970
 971         raw3215_putchar(raw, ch);
 972
 973         return 1;
 974 }
 975
 976 static void tty3215_flush_chars(struct tty_struct *tty)
 977 {
 978 }
 979
 980 /*
 981  * Returns the number of characters in the output buffer
 982  */
 983 static int tty3215_chars_in_buffer(struct tty_struct *tty)
 984 {
 985         struct raw3215_info *raw = tty->driver_data;
 986
 987         return raw->count;
 988 }
 989
 990 static void tty3215_flush_buffer(struct tty_struct *tty)
 991 {
 992         struct raw3215_info *raw = tty->driver_data;
 993
 994         raw3215_flush_buffer(raw);
 995         tty_wakeup(tty);
 996 }
 997
 998 /*
 999  * Disable reading from a 3215 tty
1000  */
1001 static void tty3215_throttle(struct tty_struct * tty)
1002 {
1003         struct raw3215_info *raw = tty->driver_data;
1004
1005         raw->flags |= RAW3215_THROTTLED;
1006 }
1007
1008 /*
1009  * Enable reading from a 3215 tty
1010  */
1011 static void tty3215_unthrottle(struct tty_struct * tty)
1012 {
1013         struct raw3215_info *raw = tty->driver_data;
1014         unsigned long flags;
1015
1016         if (raw->flags & RAW3215_THROTTLED) {
1017                 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
1018                 raw->flags &= ~RAW3215_THROTTLED;
1019                 raw3215_try_io(raw);
1020                 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
1021         }
1022 }
1023
1024 /*
1025  * Disable writing to a 3215 tty
1026  */
1027 static void tty3215_stop(struct tty_struct *tty)
1028 {
1029         struct raw3215_info *raw = tty->driver_data;
1030
1031         raw->flags |= RAW3215_STOPPED;
1032 }
1033
1034 /*
1035  * Enable writing to a 3215 tty
1036  */
1037 static void tty3215_start(struct tty_struct *tty)
1038 {
1039         struct raw3215_info *raw = tty->driver_data;
1040         unsigned long flags;
1041
1042         if (raw->flags & RAW3215_STOPPED) {
1043                 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
1044                 raw->flags &= ~RAW3215_STOPPED;
1045                 raw3215_try_io(raw);
1046                 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
1047         }
1048 }
1049
1050 static const struct tty_operations tty3215_ops = {
1051         .install = tty3215_install,
1052         .open = tty3215_open,
1053         .close = tty3215_close,
1054         .write = tty3215_write,
1055         .put_char = tty3215_put_char,
1056         .flush_chars = tty3215_flush_chars,
1057         .write_room = tty3215_write_room,
1058         .chars_in_buffer = tty3215_chars_in_buffer,
1059         .flush_buffer = tty3215_flush_buffer,
1060         .throttle = tty3215_throttle,
1061         .unthrottle = tty3215_unthrottle,
1062         .stop = tty3215_stop,
1063         .start = tty3215_start,
1064 };
1065
1066 /*
1067  * 3215 tty registration code called from tty_init().
1068  * Most kernel services (incl. kmalloc) are available at this poimt.
1069  */
1070 static int __init tty3215_init(void)
1071 {
1072         struct tty_driver *driver;
1073         int ret;
1074
1075         if (!CONSOLE_IS_3215)
1076                 return 0;
1077
1078         driver = alloc_tty_driver(NR_3215);
1079         if (!driver)
1080                 return -ENOMEM;
1081
1082         ret = ccw_driver_register(&raw3215_ccw_driver);
1083         if (ret) {
1084                 put_tty_driver(driver);
1085                 return ret;
1086         }
1087         /*
1088          * Initialize the tty_driver structure
1089          * Entries in tty3215_driver that are NOT initialized:
1090          * proc_entry, set_termios, flush_buffer, set_ldisc, write_proc
1091          */
1092
1093         driver->driver_name = "tty3215";
1094         driver->name = "ttyS";
1095         driver->major = TTY_MAJOR;
1096         driver->minor_start = 64;
1097         driver->type = TTY_DRIVER_TYPE_SYSTEM;
1098         driver->subtype = SYSTEM_TYPE_TTY;
1099         driver->init_termios = tty_std_termios;
1100         driver->init_termios.c_iflag = IGNBRK | IGNPAR;
1101         driver->init_termios.c_oflag = ONLCR;
1102         driver->init_termios.c_lflag = ISIG;
1103         driver->flags = TTY_DRIVER_REAL_RAW;
1104         tty_set_operations(driver, &tty3215_ops);
1105         ret = tty_register_driver(driver);
1106         if (ret) {
1107                 put_tty_driver(driver);
1108                 return ret;
1109         }
1110         tty3215_driver = driver;
1111         return 0;
1112 }
1113 device_initcall(tty3215_init);