drivers/s390/char/con3215.c

   1 /*
   2  *  drivers/s390/char/con3215.c
   3  *    3215 line mode terminal driver.
   4  *
   5  *  S390 version
   6  *    Copyright (C) 1999,2000 IBM Deutschland Entwicklung GmbH, IBM Corporation
   7  *    Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com),
   8  *
   9  *  Updated:
  10  *   Aug-2000: Added tab support
  11  *             Dan Morrison, IBM Corporation (dmorriso@cse.buffalo.edu)
  12  */
  13
  14 #include <linux/config.h>
  15 #include <linux/module.h>
  16 #include <linux/types.h>
  17 #include <linux/kdev_t.h>
  18 #include <linux/tty.h>
  19 #include <linux/vt_kern.h>
  20 #include <linux/init.h>
  21 #include <linux/console.h>
  22 #include <linux/interrupt.h>
  23
  24 #include <linux/slab.h>
  25 #include <linux/bootmem.h>
  26
  27 #include <asm/ccwdev.h>
  28 #include <asm/cio.h>
  29 #include <asm/io.h>
  30 #include <asm/ebcdic.h>
  31 #include <asm/uaccess.h>
  32 #include <asm/delay.h>
  33 #include <asm/cpcmd.h>
  34 #include <asm/setup.h>
  35
  36 #include "ctrlchar.h"
  37
  38 #define NR_3215             1
  39 #define NR_3215_REQ         (4*NR_3215)
  40 #define RAW3215_BUFFER_SIZE 65536     /* output buffer size */
  41 #define RAW3215_INBUF_SIZE  256       /* input buffer size */
  42 #define RAW3215_MIN_SPACE   128       /* minimum free space for wakeup */
  43 #define RAW3215_MIN_WRITE   1024      /* min. length for immediate output */
  44 #define RAW3215_MAX_BYTES   3968      /* max. bytes to write with one ssch */
  45 #define RAW3215_MAX_NEWLINE 50        /* max. lines to write with one ssch */
  46 #define RAW3215_NR_CCWS     3
  47 #define RAW3215_TIMEOUT     HZ/10     /* time for delayed output */
  48
  49 #define RAW3215_FIXED       1         /* 3215 console device is not be freed */
  50 #define RAW3215_ACTIVE      2         /* set if the device is in use */
  51 #define RAW3215_WORKING     4         /* set if a request is being worked on */
  52 #define RAW3215_THROTTLED   8         /* set if reading is disabled */
  53 #define RAW3215_STOPPED     16        /* set if writing is disabled */
  54 #define RAW3215_CLOSING     32        /* set while in close process */
  55 #define RAW3215_TIMER_RUNS  64        /* set if the output delay timer is on */
  56 #define RAW3215_FLUSHING    128       /* set to flush buffer (no delay) */
  57
  58 #define TAB_STOP_SIZE       8         /* tab stop size */
  59
  60 /*
  61  * Request types for a 3215 device
  62  */
  63 enum raw3215_type {
  64         RAW3215_FREE, RAW3215_READ, RAW3215_WRITE
  65 };
  66
  67 /*
  68  * Request structure for a 3215 device
  69  */
  70 struct raw3215_req {
  71         enum raw3215_type type;       /* type of the request */
  72         int start, len;               /* start index & len in output buffer */
  73         int delayable;                /* indication to wait for more data */
  74         int residual;                 /* residual count for read request */
  75         struct ccw1 ccws[RAW3215_NR_CCWS]; /* space for the channel program */
  76         struct raw3215_info *info;    /* pointer to main structure */
  77         struct raw3215_req *next;     /* pointer to next request */
  78 } __attribute__ ((aligned(8)));
  79
  80 struct raw3215_info {
  81         struct ccw_device *cdev;      /* device for tty driver */
  82         spinlock_t *lock;             /* pointer to irq lock */
  83         int flags;                    /* state flags */
  84         char *buffer;                 /* pointer to output buffer */
  85         char *inbuf;                  /* pointer to input buffer */
  86         int head;                     /* first free byte in output buffer */
  87         int count;                    /* number of bytes in output buffer */
  88         int written;                  /* number of bytes in write requests */
  89         struct tty_struct *tty;       /* pointer to tty structure if present */
  90         struct tasklet_struct tasklet;
  91         struct raw3215_req *queued_read; /* pointer to queued read requests */
  92         struct raw3215_req *queued_write;/* pointer to queued write requests */
  93         wait_queue_head_t empty_wait; /* wait queue for flushing */
  94         struct timer_list timer;      /* timer for delayed output */
  95         char *message;                /* pending message from raw3215_irq */
  96         int msg_dstat;                /* dstat for pending message */
  97         int msg_cstat;                /* cstat for pending message */
  98         int line_pos;                 /* position on the line (for tabs) */
  99         char ubuffer[80];             /* copy_from_user buffer */
 100 };
 101
 102 /* array of 3215 devices structures */
 103 static struct raw3215_info *raw3215[NR_3215];
 104 /* spinlock to protect the raw3215 array */
 105 static spinlock_t raw3215_device_lock = SPIN_LOCK_UNLOCKED;
 106 /* list of free request structures */
 107 static struct raw3215_req *raw3215_freelist;
 108 /* spinlock to protect free list */
 109 static spinlock_t raw3215_freelist_lock;
 110
 111 static struct tty_driver *tty3215_driver;
 112
 113 /*
 114  * Get a request structure from the free list
 115  */
 116 static inline struct raw3215_req *
 117 raw3215_alloc_req(void) {
 118         struct raw3215_req *req;
 119         unsigned long flags;
 120
 121         spin_lock_irqsave(&raw3215_freelist_lock, flags);
 122         req = raw3215_freelist;
 123         raw3215_freelist = req->next;
 124         spin_unlock_irqrestore(&raw3215_freelist_lock, flags);
 125         return req;
 126 }
 127
 128 /*
 129  * Put a request structure back to the free list
 130  */
 131 static inline void
 132 raw3215_free_req(struct raw3215_req *req) {
 133         unsigned long flags;
 134
 135         if (req->type == RAW3215_FREE)
 136                 return;         /* don't free a free request */
 137         req->type = RAW3215_FREE;
 138         spin_lock_irqsave(&raw3215_freelist_lock, flags);
 139         req->next = raw3215_freelist;
 140         raw3215_freelist = req;
 141         spin_unlock_irqrestore(&raw3215_freelist_lock, flags);
 142 }
 143
 144 /*
 145  * Set up a read request that reads up to 160 byte from the 3215 device.
 146  * If there is a queued read request it is used, but that shouldn't happen
 147  * because a 3215 terminal won't accept a new read before the old one is
 148  * completed.
 149  */
 150 static void
 151 raw3215_mk_read_req(struct raw3215_info *raw)
 152 {
 153         struct raw3215_req *req;
 154         struct ccw1 *ccw;
 155
 156         /* there can only be ONE read request at a time */
 157         req = raw->queued_read;
 158         if (req == NULL) {
 159                 /* no queued read request, use new req structure */
 160                 req = raw3215_alloc_req();
 161                 req->type = RAW3215_READ;
 162                 req->info = raw;
 163                 raw->queued_read = req;
 164         }
 165
 166         ccw = req->ccws;
 167         ccw->cmd_code = 0x0A; /* read inquiry */
 168         ccw->flags = 0x20;    /* ignore incorrect length */
 169         ccw->count = 160;
 170         ccw->cda = (__u32) __pa(raw->inbuf);
 171 }
 172
 173 /*
 174  * Set up a write request with the information from the main structure.
 175  * A ccw chain is created that writes as much as possible from the output
 176  * buffer to the 3215 device. If a queued write exists it is replaced by
 177  * the new, probably lengthened request.
 178  */
 179 static void
 180 raw3215_mk_write_req(struct raw3215_info *raw)
 181 {
 182         struct raw3215_req *req;
 183         struct ccw1 *ccw;
 184         int len, count, ix, lines;
 185
 186         if (raw->count <= raw->written)
 187                 return;
 188         /* check if there is a queued write request */
 189         req = raw->queued_write;
 190         if (req == NULL) {
 191                 /* no queued write request, use new req structure */
 192                 req = raw3215_alloc_req();
 193                 req->type = RAW3215_WRITE;
 194                 req->info = raw;
 195                 raw->queued_write = req;
 196         } else {
 197                 raw->written -= req->len;
 198         }
 199
 200         ccw = req->ccws;
 201         req->start = (raw->head - raw->count + raw->written) &
 202                      (RAW3215_BUFFER_SIZE - 1);
 203         /*
 204          * now we have to count newlines. We can at max accept
 205          * RAW3215_MAX_NEWLINE newlines in a single ssch due to
 206          * a restriction in VM
 207          */
 208         lines = 0;
 209         ix = req->start;
 210         while (lines < RAW3215_MAX_NEWLINE && ix != raw->head) {
 211                 if (raw->buffer[ix] == 0x15)
 212                         lines++;
 213                 ix = (ix + 1) & (RAW3215_BUFFER_SIZE - 1);
 214         }
 215         len = ((ix - 1 - req->start) & (RAW3215_BUFFER_SIZE - 1)) + 1;
 216         if (len > RAW3215_MAX_BYTES)
 217                 len = RAW3215_MAX_BYTES;
 218         req->len = len;
 219         raw->written += len;
 220
 221         /* set the indication if we should try to enlarge this request */
 222         req->delayable = (ix == raw->head) && (len < RAW3215_MIN_WRITE);
 223
 224         ix = req->start;
 225         while (len > 0) {
 226                 if (ccw > req->ccws)
 227                         ccw[-1].flags |= 0x40; /* use command chaining */
 228                 ccw->cmd_code = 0x01; /* write, auto carrier return */
 229                 ccw->flags = 0x20;    /* ignore incorrect length ind.  */
 230                 ccw->cda =
 231                         (__u32) __pa(raw->buffer + ix);
 232                 count = len;
 233                 if (ix + count > RAW3215_BUFFER_SIZE)
 234                         count = RAW3215_BUFFER_SIZE - ix;
 235                 ccw->count = count;
 236                 len -= count;
 237                 ix = (ix + count) & (RAW3215_BUFFER_SIZE - 1);
 238                 ccw++;
 239         }
 240         /*
 241          * Add a NOP to the channel program. 3215 devices are purely
 242          * emulated and its much better to avoid the channel end
 243          * interrupt in this case.
 244          */
 245         if (ccw > req->ccws)
 246                 ccw[-1].flags |= 0x40; /* use command chaining */
 247         ccw->cmd_code = 0x03; /* NOP */
 248         ccw->flags = 0;
 249         ccw->cda = 0;
 250         ccw->count = 1;
 251 }
 252
 253 /*
 254  * Start a read or a write request
 255  */
 256 static void
 257 raw3215_start_io(struct raw3215_info *raw)
 258 {
 259         struct raw3215_req *req;
 260         int res;
 261
 262         req = raw->queued_read;
 263         if (req != NULL &&
 264             !(raw->flags & (RAW3215_WORKING | RAW3215_THROTTLED))) {
 265                 /* dequeue request */
 266                 raw->queued_read = NULL;
 267                 res = ccw_device_start(raw->cdev, req->ccws,
 268                                        (unsigned long) req, 0, 0);
 269                 if (res != 0) {
 270                         /* do_IO failed, put request back to queue */
 271                         raw->queued_read = req;
 272                 } else {
 273                         raw->flags |= RAW3215_WORKING;
 274                 }
 275         }
 276         req = raw->queued_write;
 277         if (req != NULL &&
 278             !(raw->flags & (RAW3215_WORKING | RAW3215_STOPPED))) {
 279                 /* dequeue request */
 280                 raw->queued_write = NULL;
 281                 res = ccw_device_start(raw->cdev, req->ccws,
 282                                        (unsigned long) req, 0, 0);
 283                 if (res != 0) {
 284                         /* do_IO failed, put request back to queue */
 285                         raw->queued_write = req;
 286                 } else {
 287                         raw->flags |= RAW3215_WORKING;
 288                 }
 289         }
 290 }
 291
 292 /*
 293  * Function to start a delayed output after RAW3215_TIMEOUT seconds
 294  */
 295 static void
 296 raw3215_timeout(unsigned long __data)
 297 {
 298         struct raw3215_info *raw = (struct raw3215_info *) __data;
 299         unsigned long flags;
 300
 301         spin_lock_irqsave(raw->lock, flags);
 302         if (raw->flags & RAW3215_TIMER_RUNS) {
 303                 del_timer(&raw->timer);
 304                 raw->flags &= ~RAW3215_TIMER_RUNS;
 305                 raw3215_mk_write_req(raw);
 306                 raw3215_start_io(raw);
 307         }
 308         spin_unlock_irqrestore(raw->lock, flags);
 309 }
 310
 311 /*
 312  * Function to conditionally start an IO. A read is started immediately,
 313  * a write is only started immediately if the flush flag is on or the
 314  * amount of data is bigger than RAW3215_MIN_WRITE. If a write is not
 315  * done immediately a timer is started with a delay of RAW3215_TIMEOUT.
 316  */
 317 static inline void
 318 raw3215_try_io(struct raw3215_info *raw)
 319 {
 320         if (!(raw->flags & RAW3215_ACTIVE))
 321                 return;
 322         if (raw->queued_read != NULL)
 323                 raw3215_start_io(raw);
 324         else if (raw->queued_write != NULL) {
 325                 if ((raw->queued_write->delayable == 0) ||
 326                     (raw->flags & RAW3215_FLUSHING)) {
 327                         /* execute write requests bigger than minimum size */
 328                         raw3215_start_io(raw);
 329                         if (raw->flags & RAW3215_TIMER_RUNS) {
 330                                 del_timer(&raw->timer);
 331                                 raw->flags &= ~RAW3215_TIMER_RUNS;
 332                         }
 333                 } else if (!(raw->flags & RAW3215_TIMER_RUNS)) {
 334                         /* delay small writes */
 335                         init_timer(&raw->timer);
 336                         raw->timer.expires = RAW3215_TIMEOUT + jiffies;
 337                         raw->timer.data = (unsigned long) raw;
 338                         raw->timer.function = raw3215_timeout;
 339                         add_timer(&raw->timer);
 340                         raw->flags |= RAW3215_TIMER_RUNS;
 341                 }
 342         }
 343 }
 344
 345 /*
 346  * The bottom half handler routine for 3215 devices. It tries to start
 347  * the next IO and wakes up processes waiting on the tty.
 348  */
 349 static void
 350 raw3215_tasklet(void *data)
 351 {
 352         struct raw3215_info *raw;
 353         struct tty_struct *tty;
 354         unsigned long flags;
 355
 356         raw = (struct raw3215_info *) data;
 357         spin_lock_irqsave(raw->lock, flags);
 358         raw3215_mk_write_req(raw);
 359         raw3215_try_io(raw);
 360         spin_unlock_irqrestore(raw->lock, flags);
 361         /* Check for pending message from raw3215_irq */
 362         if (raw->message != NULL) {
 363                 printk(raw->message, raw->msg_dstat, raw->msg_cstat);
 364                 raw->message = NULL;
 365         }
 366         tty = raw->tty;
 367         if (tty != NULL &&
 368             RAW3215_BUFFER_SIZE - raw->count >= RAW3215_MIN_SPACE) {
 369                 if ((tty->flags & (1 << TTY_DO_WRITE_WAKEUP)) &&
 370                     tty->ldisc.write_wakeup)
 371                         (tty->ldisc.write_wakeup)(tty);
 372                 wake_up_interruptible(&tty->write_wait);
 373         }
 374 }
 375
 376 /*
 377  * Interrupt routine, called from common io layer
 378  */
 379 static void
 380 raw3215_irq(struct ccw_device *cdev, unsigned long intparm, struct irb *irb)
 381 {
 382         struct raw3215_info *raw;
 383         struct raw3215_req *req;
 384         struct tty_struct *tty;
 385         int cstat, dstat;
 386         int count, slen;
 387
 388         raw = cdev->dev.driver_data;
 389         req = (struct raw3215_req *) intparm;
 390         cstat = irb->scsw.cstat;
 391         dstat = irb->scsw.dstat;
 392         if (cstat != 0) {
 393                 raw->message = KERN_WARNING
 394                         "Got nonzero channel status in raw3215_irq "
 395                         "(dev sts 0x%2x, sch sts 0x%2x)";
 396                 raw->msg_dstat = dstat;
 397                 raw->msg_cstat = cstat;
 398                 tasklet_schedule(&raw->tasklet);
 399         }
 400         if (dstat & 0x01) { /* we got a unit exception */
 401                 dstat &= ~0x01;  /* we can ignore it */
 402         }
 403         switch (dstat) {
 404         case 0x80:
 405                 if (cstat != 0)
 406                         break;
 407                 /* Attention interrupt, someone hit the enter key */
 408                 raw3215_mk_read_req(raw);
 409                 if (MACHINE_IS_P390)
 410                         memset(raw->inbuf, 0, RAW3215_INBUF_SIZE);
 411                 tasklet_schedule(&raw->tasklet);
 412                 break;
 413         case 0x08:
 414         case 0x0C:
 415                 /* Channel end interrupt. */
 416                 if ((raw = req->info) == NULL)
 417                         return;              /* That shouldn't happen ... */
 418                 if (req->type == RAW3215_READ) {
 419                         /* store residual count, then wait for device end */
 420                         req->residual = irb->scsw.count;
 421                 }
 422                 if (dstat == 0x08)
 423                         break;
 424         case 0x04:
 425                 /* Device end interrupt. */
 426                 if ((raw = req->info) == NULL)
 427                         return;              /* That shouldn't happen ... */
 428                 if (req->type == RAW3215_READ && raw->tty != NULL) {
 429                         unsigned int cchar;
 430
 431                         tty = raw->tty;
 432                         count = 160 - req->residual;
 433                         if (MACHINE_IS_P390) {
 434                                 slen = strnlen(raw->inbuf, RAW3215_INBUF_SIZE);
 435                                 if (count > slen)
 436                                         count = slen;
 437                         } else
 438                         if (count >= TTY_FLIPBUF_SIZE - tty->flip.count)
 439                                 count = TTY_FLIPBUF_SIZE - tty->flip.count - 1;
 440                         EBCASC(raw->inbuf, count);
 441                         cchar = ctrlchar_handle(raw->inbuf, count, tty);
 442                         switch (cchar & CTRLCHAR_MASK) {
 443                         case CTRLCHAR_SYSRQ:
 444                                 break;
 445
 446                         case CTRLCHAR_CTRL:
 447                                 tty->flip.count++;
 448                                 *tty->flip.flag_buf_ptr++ = TTY_NORMAL;
 449                                 *tty->flip.char_buf_ptr++ = cchar;
 450                                 tty_flip_buffer_push(raw->tty);
 451                                 break;
 452
 453                         case CTRLCHAR_NONE:
 454                                 memcpy(tty->flip.char_buf_ptr,
 455                                        raw->inbuf, count);
 456                                 if (count < 2 ||
 457                                     (strncmp(raw->inbuf+count-2, "^n", 2) &&
 458                                     strncmp(raw->inbuf+count-2, "\252n", 2)) ) {
 459                                         /* don't add the auto \n */
 460                                         tty->flip.char_buf_ptr[count] = '\n';
 461                                         memset(tty->flip.flag_buf_ptr,
 462                                                TTY_NORMAL, count + 1);
 463                                         count++;
 464                                 } else
 465                                         count-=2;
 466                                 tty->flip.char_buf_ptr += count;
 467                                 tty->flip.flag_buf_ptr += count;
 468                                 tty->flip.count += count;
 469                                 tty_flip_buffer_push(raw->tty);
 470                                 break;
 471                         }
 472                 } else if (req->type == RAW3215_WRITE) {
 473                         raw->count -= req->len;
 474                         raw->written -= req->len;
 475                 }
 476                 raw->flags &= ~RAW3215_WORKING;
 477                 raw3215_free_req(req);
 478                 /* check for empty wait */
 479                 if (waitqueue_active(&raw->empty_wait) &&
 480                     raw->queued_write == NULL &&
 481                     raw->queued_read == NULL) {
 482                         wake_up_interruptible(&raw->empty_wait);
 483                 }
 484                 tasklet_schedule(&raw->tasklet);
 485                 break;
 486         default:
 487                 /* Strange interrupt, I'll do my best to clean up */
 488                 if (req != NULL && req->type != RAW3215_FREE) {
 489                         if (req->type == RAW3215_WRITE) {
 490                                 raw->count -= req->len;
 491                                 raw->written -= req->len;
 492                         }
 493                         raw->flags &= ~RAW3215_WORKING;
 494                         raw3215_free_req(req);
 495                 }
 496                 raw->message = KERN_WARNING
 497                         "Spurious interrupt in in raw3215_irq "
 498                         "(dev sts 0x%2x, sch sts 0x%2x)";
 499                 raw->msg_dstat = dstat;
 500                 raw->msg_cstat = cstat;
 501                 tasklet_schedule(&raw->tasklet);
 502         }
 503         return;
 504 }
 505
 506 /*
 507  * Wait until length bytes are available int the output buffer.
 508  * Has to be called with the s390irq lock held. Can be called
 509  * disabled.
 510  */
 511 static void
 512 raw3215_make_room(struct raw3215_info *raw, unsigned int length)
 513 {
 514         while (RAW3215_BUFFER_SIZE - raw->count < length) {
 515                 /* there might be a request pending */
 516                 raw->flags |= RAW3215_FLUSHING;
 517                 raw3215_mk_write_req(raw);
 518                 raw3215_try_io(raw);
 519                 raw->flags &= ~RAW3215_FLUSHING;
 520 #ifdef CONFIG_TN3215_CONSOLE
 521                 wait_cons_dev();
 522 #endif
 523                 /* Enough room freed up ? */
 524                 if (RAW3215_BUFFER_SIZE - raw->count >= length)
 525                         break;
 526                 /* there might be another cpu waiting for the lock */
 527                 spin_unlock(raw->lock);
 528                 udelay(100);
 529                 spin_lock(raw->lock);
 530         }
 531 }
 532
 533 /*
 534  * String write routine for 3215 devices
 535  */
 536 static void
 537 raw3215_write(struct raw3215_info *raw, const char *str, unsigned int length)
 538 {
 539         unsigned long flags;
 540         int c, count;
 541
 542         while (length > 0) {
 543                 spin_lock_irqsave(raw->lock, flags);
 544                 count = (length > RAW3215_BUFFER_SIZE) ?
 545                                              RAW3215_BUFFER_SIZE : length;
 546                 length -= count;
 547
 548                 raw3215_make_room(raw, count);
 549
 550                 /* copy string to output buffer and convert it to EBCDIC */
 551                 while (1) {
 552                         c = min_t(int, count,
 553                                   min(RAW3215_BUFFER_SIZE - raw->count,
 554                                       RAW3215_BUFFER_SIZE - raw->head));
 555                         if (c <= 0)
 556                                 break;
 557                         memcpy(raw->buffer + raw->head, str, c);
 558                         ASCEBC(raw->buffer + raw->head, c);
 559                         raw->head = (raw->head + c) & (RAW3215_BUFFER_SIZE - 1);
 560                         raw->count += c;
 561                         raw->line_pos += c;
 562                         str += c;
 563                         count -= c;
 564                 }
 565                 if (!(raw->flags & RAW3215_WORKING)) {
 566                         raw3215_mk_write_req(raw);
 567                         /* start or queue request */
 568                         raw3215_try_io(raw);
 569                 }
 570                 spin_unlock_irqrestore(raw->lock, flags);
 571         }
 572 }
 573
 574 /*
 575  * Put character routine for 3215 devices
 576  */
 577 static void
 578 raw3215_putchar(struct raw3215_info *raw, unsigned char ch)
 579 {
 580         unsigned long flags;
 581         unsigned int length, i;
 582
 583         spin_lock_irqsave(raw->lock, flags);
 584         if (ch == '\t') {
 585                 length = TAB_STOP_SIZE - (raw->line_pos%TAB_STOP_SIZE);
 586                 raw->line_pos += length;
 587                 ch = ' ';
 588         } else if (ch == '\n') {
 589                 length = 1;
 590                 raw->line_pos = 0;
 591         } else {
 592                 length = 1;
 593                 raw->line_pos++;
 594         }
 595         raw3215_make_room(raw, length);
 596
 597         for (i = 0; i < length; i++) {
 598                 raw->buffer[raw->head] = (char) _ascebc[(int) ch];
 599                 raw->head = (raw->head + 1) & (RAW3215_BUFFER_SIZE - 1);
 600                 raw->count++;
 601         }
 602         if (!(raw->flags & RAW3215_WORKING)) {
 603                 raw3215_mk_write_req(raw);
 604                 /* start or queue request */
 605                 raw3215_try_io(raw);
 606         }
 607         spin_unlock_irqrestore(raw->lock, flags);
 608 }
 609
 610 /*
 611  * Flush routine, it simply sets the flush flag and tries to start
 612  * pending IO.
 613  */
 614 static void
 615 raw3215_flush_buffer(struct raw3215_info *raw)
 616 {
 617         unsigned long flags;
 618
 619         spin_lock_irqsave(raw->lock, flags);
 620         if (raw->count > 0) {
 621                 raw->flags |= RAW3215_FLUSHING;
 622                 raw3215_try_io(raw);
 623                 raw->flags &= ~RAW3215_FLUSHING;
 624         }
 625         spin_unlock_irqrestore(raw->lock, flags);
 626 }
 627
 628 /*
 629  * Fire up a 3215 device.
 630  */
 631 static int
 632 raw3215_startup(struct raw3215_info *raw)
 633 {
 634         unsigned long flags;
 635
 636         if (raw->flags & RAW3215_ACTIVE)
 637                 return 0;
 638         raw->line_pos = 0;
 639         raw->flags |= RAW3215_ACTIVE;
 640         spin_lock_irqsave(raw->lock, flags);
 641         raw3215_try_io(raw);
 642         spin_unlock_irqrestore(raw->lock, flags);
 643
 644         return 0;
 645 }
 646
 647 /*
 648  * Shutdown a 3215 device.
 649  */
 650 static void
 651 raw3215_shutdown(struct raw3215_info *raw)
 652 {
 653         DECLARE_WAITQUEUE(wait, current);
 654         unsigned long flags;
 655
 656         if (!(raw->flags & RAW3215_ACTIVE) || (raw->flags & RAW3215_FIXED))
 657                 return;
 658         /* Wait for outstanding requests, then free irq */
 659         spin_lock_irqsave(raw->lock, flags);
 660         if ((raw->flags & RAW3215_WORKING) ||
 661             raw->queued_write != NULL ||
 662             raw->queued_read != NULL) {
 663                 raw->flags |= RAW3215_CLOSING;
 664                 add_wait_queue(&raw->empty_wait, &wait);
 665                 set_current_state(TASK_INTERRUPTIBLE);
 666                 spin_unlock_irqrestore(raw->lock, flags);
 667                 schedule();
 668                 spin_lock_irqsave(raw->lock, flags);
 669                 remove_wait_queue(&raw->empty_wait, &wait);
 670                 set_current_state(TASK_RUNNING);
 671                 raw->flags &= ~(RAW3215_ACTIVE | RAW3215_CLOSING);
 672         }
 673         spin_unlock_irqrestore(raw->lock, flags);
 674 }
 675
 676 static int
 677 raw3215_probe (struct ccw_device *cdev)
 678 {
 679         struct raw3215_info *raw;
 680         int line;
 681
 682         raw = kmalloc(sizeof(struct raw3215_info) +
 683                       RAW3215_INBUF_SIZE, GFP_KERNEL|GFP_DMA);
 684         if (raw == NULL)
 685                 return -ENOMEM;
 686
 687         spin_lock(&raw3215_device_lock);
 688         for (line = 0; line < NR_3215; line++) {
 689                 if (!raw3215[line]) {
 690                         raw3215[line] = raw;
 691                         break;
 692                 }
 693         }
 694         spin_unlock(&raw3215_device_lock);
 695         if (line == NR_3215) {
 696                 kfree(raw);
 697                 return -ENODEV;
 698         }
 699
 700         raw->cdev = cdev;
 701         raw->lock = get_ccwdev_lock(cdev);
 702         raw->inbuf = (char *) raw + sizeof(struct raw3215_info);
 703         memset(raw, 0, sizeof(struct raw3215_info));
 704         raw->buffer = (char *) kmalloc(RAW3215_BUFFER_SIZE,
 705                                        GFP_KERNEL|GFP_DMA);
 706         if (raw->buffer == NULL) {
 707                 spin_lock(&raw3215_device_lock);
 708                 raw3215[line] = 0;
 709                 spin_unlock(&raw3215_device_lock);
 710                 kfree(raw);
 711                 return -ENOMEM;
 712         }
 713         tasklet_init(&raw->tasklet,
 714                      (void (*)(unsigned long)) raw3215_tasklet,
 715                      (unsigned long) raw);
 716         init_waitqueue_head(&raw->empty_wait);
 717
 718         cdev->dev.driver_data = raw;
 719         cdev->handler = raw3215_irq;
 720
 721         return 0;
 722 }
 723
 724 static void
 725 raw3215_remove (struct ccw_device *cdev)
 726 {
 727         struct raw3215_info *raw;
 728
 729         ccw_device_set_offline(cdev);
 730         raw = cdev->dev.driver_data;
 731         if (raw) {
 732                 cdev->dev.driver_data = NULL;
 733                 if (raw->buffer)
 734                         kfree(raw->buffer);
 735                 kfree(raw);
 736         }
 737 }
 738
 739 static int
 740 raw3215_set_online (struct ccw_device *cdev)
 741 {
 742         struct raw3215_info *raw;
 743
 744         raw = cdev->dev.driver_data;
 745         if (!raw)
 746                 return -ENODEV;
 747
 748         return raw3215_startup(raw);
 749 }
 750
 751 static int
 752 raw3215_set_offline (struct ccw_device *cdev)
 753 {
 754         struct raw3215_info *raw;
 755
 756         raw = cdev->dev.driver_data;
 757         if (!raw)
 758                 return -ENODEV;
 759
 760         raw3215_shutdown(raw);
 761
 762         return 0;
 763 }
 764
 765 static struct ccw_device_id raw3215_id[] = {
 766         { CCW_DEVICE(0x3215, 0) },
 767         { /* end of list */ },
 768 };
 769
 770 static struct ccw_driver raw3215_ccw_driver = {
 771         .name           = "3215",
 772         .owner          = THIS_MODULE,
 773         .ids            = raw3215_id,
 774         .probe          = &raw3215_probe,
 775         .remove         = &raw3215_remove,
 776         .set_online     = &raw3215_set_online,
 777         .set_offline    = &raw3215_set_offline,
 778 };
 779
 780 #ifdef CONFIG_TN3215_CONSOLE
 781 /*
 782  * Write a string to the 3215 console
 783  */
 784 static void
 785 con3215_write(struct console *co, const char *str, unsigned int count)
 786 {
 787         struct raw3215_info *raw;
 788         int i;
 789
 790         if (count <= 0)
 791                 return;
 792         raw = raw3215[0];       /* console 3215 is the first one */
 793         while (count > 0) {
 794                 for (i = 0; i < count; i++)
 795                         if (str[i] == '\t' || str[i] == '\n')
 796                                 break;
 797                 raw3215_write(raw, str, i);
 798                 count -= i;
 799                 str += i;
 800                 if (count > 0) {
 801                         raw3215_putchar(raw, *str);
 802                         count--;
 803                         str++;
 804                 }
 805         }
 806 }
 807
 808 static struct tty_driver *con3215_device(struct console *c, int *index)
 809 {
 810         *index = c->index;
 811         return tty3215_driver;
 812 }
 813
 814 /*
 815  * panic() calls console_unblank before the system enters a
 816  * disabled, endless loop.
 817  */
 818 static void
 819 con3215_unblank(void)
 820 {
 821         struct raw3215_info *raw;
 822         unsigned long flags;
 823
 824         raw = raw3215[0];  /* console 3215 is the first one */
 825         spin_lock_irqsave(raw->lock, flags);
 826         raw3215_make_room(raw, RAW3215_BUFFER_SIZE);
 827         spin_unlock_irqrestore(raw->lock, flags);
 828 }
 829
 830 static int __init
 831 con3215_consetup(struct console *co, char *options)
 832 {
 833         return 0;
 834 }
 835
 836 /*
 837  *  The console structure for the 3215 console
 838  */
 839 static struct console con3215 = {
 840         .name    = "ttyS",
 841         .write   = con3215_write,
 842         .device  = con3215_device,
 843         .unblank = con3215_unblank,
 844         .setup   = con3215_consetup,
 845         .flags   = CON_PRINTBUFFER,
 846 };
 847
 848 /*
 849  * 3215 console initialization code called from console_init().
 850  * NOTE: This is called before kmalloc is available.
 851  */
 852 static int __init
 853 con3215_init(void)
 854 {
 855         struct ccw_device *cdev;
 856         struct raw3215_info *raw;
 857         struct raw3215_req *req;
 858         int i;
 859
 860         /* Check if 3215 is to be the console */
 861         if (!CONSOLE_IS_3215)
 862                 return -ENODEV;
 863
 864         /* Set the console mode for VM */
 865         if (MACHINE_IS_VM) {
 866                 cpcmd("TERM CONMODE 3215", NULL, 0);
 867                 cpcmd("TERM AUTOCR OFF", NULL, 0);
 868         }
 869
 870         /* allocate 3215 request structures */
 871         raw3215_freelist = NULL;
 872         spin_lock_init(&raw3215_freelist_lock);
 873         for (i = 0; i < NR_3215_REQ; i++) {
 874                 req = (struct raw3215_req *) alloc_bootmem_low(sizeof(struct raw3215_req));
 875                 req->next = raw3215_freelist;
 876                 raw3215_freelist = req;
 877         }
 878
 879         cdev = ccw_device_probe_console();
 880         if (!cdev)
 881                 return -ENODEV;
 882
 883         raw3215[0] = raw = (struct raw3215_info *)
 884                 alloc_bootmem_low(sizeof(struct raw3215_info));
 885         memset(raw, 0, sizeof(struct raw3215_info));
 886         raw->buffer = (char *) alloc_bootmem_low(RAW3215_BUFFER_SIZE);
 887         raw->inbuf = (char *) alloc_bootmem_low(RAW3215_INBUF_SIZE);
 888         raw->cdev = cdev;
 889         raw->lock = get_ccwdev_lock(cdev);
 890         cdev->dev.driver_data = raw;
 891         cdev->handler = raw3215_irq;
 892
 893         raw->flags |= RAW3215_FIXED;
 894         tasklet_init(&raw->tasklet,
 895                      (void (*)(unsigned long)) raw3215_tasklet,
 896                      (unsigned long) raw);
 897         init_waitqueue_head(&raw->empty_wait);
 898
 899         /* Request the console irq */
 900         if (raw3215_startup(raw) != 0) {
 901                 free_bootmem((unsigned long) raw->inbuf, RAW3215_INBUF_SIZE);
 902                 free_bootmem((unsigned long) raw->buffer, RAW3215_BUFFER_SIZE);
 903                 free_bootmem((unsigned long) raw, sizeof(struct raw3215_info));
 904                 raw3215[0] = NULL;
 905                 printk("Couldn't find a 3215 console device\n");
 906                 return -ENODEV;
 907         }
 908         register_console(&con3215);
 909         return 0;
 910 }
 911 console_initcall(con3215_init);
 912 #endif
 913
 914 /*
 915  * tty3215_open
 916  *
 917  * This routine is called whenever a 3215 tty is opened.
 918  */
 919 static int
 920 tty3215_open(struct tty_struct *tty, struct file * filp)
 921 {
 922         struct raw3215_info *raw;
 923         int retval, line;
 924
 925         line = tty->index;
 926         if ((line < 0) || (line >= NR_3215))
 927                 return -ENODEV;
 928
 929         raw = raw3215[line];
 930         if (raw == NULL)
 931                 return -ENODEV;
 932
 933         tty->driver_data = raw;
 934         raw->tty = tty;
 935
 936         tty->low_latency = 0;  /* don't use bottom half for pushing chars */
 937         /*
 938          * Start up 3215 device
 939          */
 940         retval = raw3215_startup(raw);
 941         if (retval)
 942                 return retval;
 943
 944         return 0;
 945 }
 946
 947 /*
 948  * tty3215_close()
 949  *
 950  * This routine is called when the 3215 tty is closed. We wait
 951  * for the remaining request to be completed. Then we clean up.
 952  */
 953 static void
 954 tty3215_close(struct tty_struct *tty, struct file * filp)
 955 {
 956         struct raw3215_info *raw;
 957
 958         raw = (struct raw3215_info *) tty->driver_data;
 959         if (raw == NULL || tty->count > 1)
 960                 return;
 961         tty->closing = 1;
 962         /* Shutdown the terminal */
 963         raw3215_shutdown(raw);
 964         tty->closing = 0;
 965         raw->tty = NULL;
 966 }
 967
 968 /*
 969  * Returns the amount of free space in the output buffer.
 970  */
 971 static int
 972 tty3215_write_room(struct tty_struct *tty)
 973 {
 974         struct raw3215_info *raw;
 975
 976         raw = (struct raw3215_info *) tty->driver_data;
 977
 978         /* Subtract TAB_STOP_SIZE to allow for a tab, 8 <<< 64K */
 979         if ((RAW3215_BUFFER_SIZE - raw->count - TAB_STOP_SIZE) >= 0)
 980                 return RAW3215_BUFFER_SIZE - raw->count - TAB_STOP_SIZE;
 981         else
 982                 return 0;
 983 }
 984
 985 /*
 986  * String write routine for 3215 ttys
 987  */
 988 static int
 989 tty3215_write(struct tty_struct * tty, int from_user,
 990               const unsigned char *buf, int count)
 991 {
 992         struct raw3215_info *raw;
 993         int length, ret;
 994
 995         if (!tty)
 996                 return 0;
 997         raw = (struct raw3215_info *) tty->driver_data;
 998         if (!from_user) {
 999                 raw3215_write(raw, buf, count);
1000                 return count;
1001         }
1002         ret = 0;
1003         while (count > 0) {
1004                 length = count < 80 ? count : 80;
1005                 length -= copy_from_user(raw->ubuffer,
1006                                 (const unsigned char __user *)buf, length);
1007                 if (length == 0) {
1008                         if (!ret)
1009                                 ret = -EFAULT;
1010                         break;
1011                 }
1012                 raw3215_write(raw, raw->ubuffer, count);
1013                 buf += length;
1014                 count -= length;
1015                 ret += length;
1016         }
1017         return ret;
1018 }
1019
1020 /*
1021  * Put character routine for 3215 ttys
1022  */
1023 static void
1024 tty3215_put_char(struct tty_struct *tty, unsigned char ch)
1025 {
1026         struct raw3215_info *raw;
1027
1028         if (!tty)
1029                 return;
1030         raw = (struct raw3215_info *) tty->driver_data;
1031         raw3215_putchar(raw, ch);
1032 }
1033
1034 static void
1035 tty3215_flush_chars(struct tty_struct *tty)
1036 {
1037 }
1038
1039 /*
1040  * Returns the number of characters in the output buffer
1041  */
1042 static int
1043 tty3215_chars_in_buffer(struct tty_struct *tty)
1044 {
1045         struct raw3215_info *raw;
1046
1047         raw = (struct raw3215_info *) tty->driver_data;
1048         return raw->count;
1049 }
1050
1051 static void
1052 tty3215_flush_buffer(struct tty_struct *tty)
1053 {
1054         struct raw3215_info *raw;
1055
1056         raw = (struct raw3215_info *) tty->driver_data;
1057         raw3215_flush_buffer(raw);
1058         wake_up_interruptible(&tty->write_wait);
1059         if ((tty->flags & (1 << TTY_DO_WRITE_WAKEUP)) &&
1060             tty->ldisc.write_wakeup)
1061                 (tty->ldisc.write_wakeup)(tty);
1062 }
1063
1064 /*
1065  * Currently we don't have any io controls for 3215 ttys
1066  */
1067 static int
1068 tty3215_ioctl(struct tty_struct *tty, struct file * file,
1069               unsigned int cmd, unsigned long arg)
1070 {
1071         if (tty->flags & (1 << TTY_IO_ERROR))
1072                 return -EIO;
1073
1074         switch (cmd) {
1075         default:
1076                 return -ENOIOCTLCMD;
1077         }
1078         return 0;
1079 }
1080
1081 /*
1082  * Disable reading from a 3215 tty
1083  */
1084 static void
1085 tty3215_throttle(struct tty_struct * tty)
1086 {
1087         struct raw3215_info *raw;
1088
1089         raw = (struct raw3215_info *) tty->driver_data;
1090         raw->flags |= RAW3215_THROTTLED;
1091 }
1092
1093 /*
1094  * Enable reading from a 3215 tty
1095  */
1096 static void
1097 tty3215_unthrottle(struct tty_struct * tty)
1098 {
1099         struct raw3215_info *raw;
1100         unsigned long flags;
1101
1102         raw = (struct raw3215_info *) tty->driver_data;
1103         if (raw->flags & RAW3215_THROTTLED) {
1104                 spin_lock_irqsave(raw->lock, flags);
1105                 raw->flags &= ~RAW3215_THROTTLED;
1106                 raw3215_try_io(raw);
1107                 spin_unlock_irqrestore(raw->lock, flags);
1108         }
1109 }
1110
1111 /*
1112  * Disable writing to a 3215 tty
1113  */
1114 static void
1115 tty3215_stop(struct tty_struct *tty)
1116 {
1117         struct raw3215_info *raw;
1118
1119         raw = (struct raw3215_info *) tty->driver_data;
1120         raw->flags |= RAW3215_STOPPED;
1121 }
1122
1123 /*
1124  * Enable writing to a 3215 tty
1125  */
1126 static void
1127 tty3215_start(struct tty_struct *tty)
1128 {
1129         struct raw3215_info *raw;
1130         unsigned long flags;
1131
1132         raw = (struct raw3215_info *) tty->driver_data;
1133         if (raw->flags & RAW3215_STOPPED) {
1134                 spin_lock_irqsave(raw->lock, flags);
1135                 raw->flags &= ~RAW3215_STOPPED;
1136                 raw3215_try_io(raw);
1137                 spin_unlock_irqrestore(raw->lock, flags);
1138         }
1139 }
1140
1141 static struct tty_operations tty3215_ops = {
1142         .open = tty3215_open,
1143         .close = tty3215_close,
1144         .write = tty3215_write,
1145         .put_char = tty3215_put_char,
1146         .flush_chars = tty3215_flush_chars,
1147         .write_room = tty3215_write_room,
1148         .chars_in_buffer = tty3215_chars_in_buffer,
1149         .flush_buffer = tty3215_flush_buffer,
1150         .ioctl = tty3215_ioctl,
1151         .throttle = tty3215_throttle,
1152         .unthrottle = tty3215_unthrottle,
1153         .stop = tty3215_stop,
1154         .start = tty3215_start,
1155 };
1156
1157 /*
1158  * 3215 tty registration code called from tty_init().
1159  * Most kernel services (incl. kmalloc) are available at this poimt.
1160  */
1161 int __init
1162 tty3215_init(void)
1163 {
1164         struct tty_driver *driver;
1165         int ret;
1166
1167         if (!CONSOLE_IS_3215)
1168                 return 0;
1169
1170         driver = alloc_tty_driver(NR_3215);
1171         if (!driver)
1172                 return -ENOMEM;
1173
1174         ret = ccw_driver_register(&raw3215_ccw_driver);
1175         if (ret) {
1176                 put_tty_driver(driver);
1177                 return ret;
1178         }
1179         /*
1180          * Initialize the tty_driver structure
1181          * Entries in tty3215_driver that are NOT initialized:
1182          * proc_entry, set_termios, flush_buffer, set_ldisc, write_proc
1183          */
1184
1185         driver->owner = THIS_MODULE;
1186         driver->driver_name = "tty3215";
1187         driver->name = "ttyS";
1188         driver->major = TTY_MAJOR;
1189         driver->minor_start = 64;
1190         driver->type = TTY_DRIVER_TYPE_SYSTEM;
1191         driver->subtype = SYSTEM_TYPE_TTY;
1192         driver->init_termios = tty_std_termios;
1193         driver->init_termios.c_iflag = IGNBRK | IGNPAR;
1194         driver->init_termios.c_oflag = ONLCR | XTABS;
1195         driver->init_termios.c_lflag = ISIG;
1196         driver->flags = TTY_DRIVER_REAL_RAW;
1197         tty_set_operations(driver, &tty3215_ops);
1198         ret = tty_register_driver(driver);
1199         if (ret) {
1200                 printk("Couldn't register tty3215 driver\n");
1201                 put_tty_driver(driver);
1202                 return ret;
1203         }
1204         tty3215_driver = driver;
1205         return 0;
1206 }
1207
1208 static void __exit
1209 tty3215_exit(void)
1210 {
1211         tty_unregister_driver(tty3215_driver);
1212         put_tty_driver(tty3215_driver);
1213         ccw_driver_unregister(&raw3215_ccw_driver);
1214 }
1215
1216 module_init(tty3215_init);
1217 module_exit(tty3215_exit);