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/types.h>
  16 #include <linux/kdev_t.h>
  17 #include <linux/tty.h>
  18 #include <linux/vt_kern.h>
  19 #include <linux/init.h>
  20 #include <linux/console.h>
  21 #include <linux/interrupt.h>
  22
  23 #include <linux/slab.h>
  24 #include <linux/bootmem.h>
  25 #include <linux/devfs_fs_kernel.h>
  26
  27 #include <asm/io.h>
  28 #include <asm/ebcdic.h>
  29 #include <asm/uaccess.h>
  30 #include <asm/delay.h>
  31 #include <asm/cpcmd.h>
  32 #include <asm/irq.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_ACTIVE      2         /* set if the device is in use */
  50 #define RAW3215_WORKING     4         /* set if a request is being worked on */
  51 #define RAW3215_THROTTLED   8         /* set if reading is disabled */
  52 #define RAW3215_STOPPED     16        /* set if writing is disabled */
  53 #define RAW3215_CLOSING     32        /* set while in close process */
  54 #define RAW3215_TIMER_RUNS  64        /* set if the output delay timer is on */
  55 #define RAW3215_FLUSHING    128       /* set to flush buffer (no delay) */
  56 #define RAW3215_BH_PENDING  256       /* indication for bh scheduling */
  57
  58 #define TAB_STOP_SIZE       8         /* tab stop size */
  59
  60 struct _raw3215_info;                 /* forward declaration ... */
  61
  62 int raw3215_condevice = -1;           /* preset console device */
  63
  64 /*
  65  * Request types for a 3215 device
  66  */
  67 typedef enum {
  68         RAW3215_FREE, RAW3215_READ, RAW3215_WRITE
  69 } raw3215_type;
  70
  71 /*
  72  * Request structure for a 3215 device
  73  */
  74 typedef struct _raw3215_req {
  75         raw3215_type type;            /* type of the request */
  76         int start, len;               /* start index & len in output buffer */
  77         int delayable;                /* indication to wait for more data */
  78         int residual;                 /* residual count for read request */
  79         ccw1_t ccws[RAW3215_NR_CCWS]; /* space for the channel program */
  80         struct _raw3215_info *info;   /* pointer to main structure */
  81         struct _raw3215_req *next;    /* pointer to next request */
  82 } raw3215_req  __attribute__ ((aligned(8)));
  83
  84 typedef struct _raw3215_info {
  85         int flags;                    /* state flags */
  86         int irq;                      /* interrupt number to do_IO */
  87         char *buffer;                 /* pointer to output buffer */
  88         char *inbuf;                  /* pointer to input buffer */
  89         int head;                     /* first free byte in output buffer */
  90         int count;                    /* number of bytes in output buffer */
  91         int written;                  /* number of bytes in write requests */
  92         devstat_t devstat;            /* device status structure for do_IO */
  93         struct tty_struct *tty;       /* pointer to tty structure if present */
  94         struct tq_struct tqueue;      /* task queue to bottom half */
  95         raw3215_req *queued_read;     /* pointer to queued read requests */
  96         raw3215_req *queued_write;    /* pointer to queued write requests */
  97         wait_queue_head_t empty_wait; /* wait queue for flushing */
  98         struct timer_list timer;      /* timer for delayed output */
  99         char *message;                /* pending message from raw3215_irq */
 100         int msg_dstat;                /* dstat for pending message */
 101         int msg_cstat;                /* cstat for pending message */
 102         int line_pos;                 /* position on the line (for tabs) */
 103 } raw3215_info;
 104
 105 static raw3215_info *raw3215[NR_3215];  /* array of 3215 devices structures */
 106 static raw3215_req *raw3215_freelist;   /* list of free request structures */
 107 static spinlock_t raw3215_freelist_lock;/* spinlock to protect free list */
 108
 109 static struct tty_driver tty3215_driver;
 110 static struct tty_struct *tty3215_table[NR_3215];
 111 static struct termios *tty3215_termios[NR_3215];
 112 static struct termios *tty3215_termios_locked[NR_3215];
 113 static int tty3215_refcount;
 114
 115 #ifndef MIN
 116 #define MIN(a,b)        ((a) < (b) ? (a) : (b))
 117 #endif
 118
 119 /*
 120  * Get a request structure from the free list
 121  */
 122 static inline raw3215_req *raw3215_alloc_req(void) {
 123         raw3215_req *req;
 124         unsigned long flags;
 125
 126         spin_lock_irqsave(&raw3215_freelist_lock, flags);
 127         req = raw3215_freelist;
 128         raw3215_freelist = req->next;
 129         spin_unlock_irqrestore(&raw3215_freelist_lock, flags);
 130         return req;
 131 }
 132
 133 /*
 134  * Put a request structure back to the free list
 135  */
 136 static inline void raw3215_free_req(raw3215_req *req) {
 137         unsigned long flags;
 138
 139         if (req->type == RAW3215_FREE)
 140                 return;         /* don't free a free request */
 141         req->type = RAW3215_FREE;
 142         spin_lock_irqsave(&raw3215_freelist_lock, flags);
 143         req->next = raw3215_freelist;
 144         raw3215_freelist = req;
 145         spin_unlock_irqrestore(&raw3215_freelist_lock, flags);
 146 }
 147
 148 /*
 149  * Set up a read request that reads up to 160 byte from the 3215 device.
 150  * If there is a queued read request it is used, but that shouldn't happen
 151  * because a 3215 terminal won't accept a new read before the old one is
 152  * completed.
 153  */
 154 static void raw3215_mk_read_req(raw3215_info *raw)
 155 {
 156         raw3215_req *req;
 157         ccw1_t *ccw;
 158
 159         /* there can only be ONE read request at a time */
 160         req = raw->queued_read;
 161         if (req == NULL) {
 162                 /* no queued read request, use new req structure */
 163                 req = raw3215_alloc_req();
 164                 req->type = RAW3215_READ;
 165                 req->info = raw;
 166                 raw->queued_read = req;
 167         }
 168
 169         ccw = req->ccws;
 170         ccw->cmd_code = 0x0A; /* read inquiry */
 171         ccw->flags = 0x20;    /* ignore incorrect length */
 172         ccw->count = 160;
 173         ccw->cda = (__u32) __pa(raw->inbuf);
 174 }
 175
 176 /*
 177  * Set up a write request with the information from the main structure.
 178  * A ccw chain is created that writes as much as possible from the output
 179  * buffer to the 3215 device. If a queued write exists it is replaced by
 180  * the new, probably lengthened request.
 181  */
 182 static void raw3215_mk_write_req(raw3215_info *raw)
 183 {
 184         raw3215_req *req;
 185         ccw1_t *ccw;
 186         int len, count, ix, lines;
 187
 188         if (raw->count <= raw->written)
 189                 return;
 190         /* check if there is a queued write request */
 191         req = raw->queued_write;
 192         if (req == NULL) {
 193                 /* no queued write request, use new req structure */
 194                 req = raw3215_alloc_req();
 195                 req->type = RAW3215_WRITE;
 196                 req->info = raw;
 197                 raw->queued_write = req;
 198         } else {
 199                 raw->written -= req->len;
 200         }
 201
 202         ccw = req->ccws;
 203         req->start = (raw->head - raw->count + raw->written) &
 204                      (RAW3215_BUFFER_SIZE - 1);
 205         /*
 206          * now we have to count newlines. We can at max accept
 207          * RAW3215_MAX_NEWLINE newlines in a single ssch due to
 208          * a restriction in VM
 209          */
 210         lines = 0;
 211         ix = req->start;
 212         while (lines < RAW3215_MAX_NEWLINE && ix != raw->head) {
 213                 if (raw->buffer[ix] == 0x15)
 214                         lines++;
 215                 ix = (ix + 1) & (RAW3215_BUFFER_SIZE - 1);
 216         }
 217         len = ((ix - 1 - req->start) & (RAW3215_BUFFER_SIZE - 1)) + 1;
 218         if (len > RAW3215_MAX_BYTES)
 219                 len = RAW3215_MAX_BYTES;
 220         req->len = len;
 221         raw->written += len;
 222
 223         /* set the indication if we should try to enlarge this request */
 224         req->delayable = (ix == raw->head) && (len < RAW3215_MIN_WRITE);
 225
 226         ix = req->start;
 227         while (len > 0) {
 228                 if (ccw > req->ccws)
 229                         ccw[-1].flags |= 0x40; /* use command chaining */
 230                 ccw->cmd_code = 0x01; /* write, auto carrier return */
 231                 ccw->flags = 0x20;    /* ignore incorrect length ind.  */
 232                 ccw->cda =
 233                         (__u32) __pa(raw->buffer + ix);
 234                 count = len;
 235                 if (ix + count > RAW3215_BUFFER_SIZE)
 236                         count = RAW3215_BUFFER_SIZE - ix;
 237                 ccw->count = count;
 238                 len -= count;
 239                 ix = (ix + count) & (RAW3215_BUFFER_SIZE - 1);
 240                 ccw++;
 241         }
 242         /*
 243          * Add a NOP to the channel program. 3215 devices are purely
 244          * emulated and its much better to avoid the channel end
 245          * interrupt in this case.
 246          */
 247         if (ccw > req->ccws)
 248                 ccw[-1].flags |= 0x40; /* use command chaining */
 249         ccw->cmd_code = 0x03; /* NOP */
 250         ccw->flags = 0;
 251         ccw->cda = 0;
 252         ccw->count = 1;
 253 }
 254
 255 /*
 256  * Start a read or a write request
 257  */
 258 static void raw3215_start_io(raw3215_info *raw)
 259 {
 260         raw3215_req *req;
 261         int res;
 262
 263         req = raw->queued_read;
 264         if (req != NULL &&
 265             !(raw->flags & (RAW3215_WORKING | RAW3215_THROTTLED))) {
 266                 /* dequeue request */
 267                 raw->queued_read = NULL;
 268                 res = do_IO(raw->irq, req->ccws, (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 = do_IO(raw->irq, req->ccws, (unsigned long) req, 0, 0);
 282                 if (res != 0) {
 283                         /* do_IO failed, put request back to queue */
 284                         raw->queued_write = req;
 285                 } else {
 286                         raw->flags |= RAW3215_WORKING;
 287                 }
 288         }
 289 }
 290
 291 /*
 292  * Function to start a delayed output after RAW3215_TIMEOUT seconds
 293  */
 294 static void raw3215_timeout(unsigned long __data)
 295 {
 296         raw3215_info *raw = (raw3215_info *) __data;
 297         unsigned long flags;
 298
 299         s390irq_spin_lock_irqsave(raw->irq, flags);
 300         if (raw->flags & RAW3215_TIMER_RUNS) {
 301                 del_timer(&raw->timer);
 302                 raw->flags &= ~RAW3215_TIMER_RUNS;
 303                 raw3215_mk_write_req(raw);
 304                 raw3215_start_io(raw);
 305         }
 306         s390irq_spin_unlock_irqrestore(raw->irq, flags);
 307 }
 308
 309 /*
 310  * Function to conditionally start an IO. A read is started immediatly,
 311  * a write is only started immediatly if the flush flag is on or the
 312  * amount of data is bigger than RAW3215_MIN_WRITE. If a write is not
 313  * done immediatly a timer is started with a delay of RAW3215_TIMEOUT.
 314  */
 315 static inline void raw3215_try_io(raw3215_info *raw)
 316 {
 317         if (!(raw->flags & RAW3215_ACTIVE))
 318                 return;
 319         if (raw->queued_read != NULL)
 320                 raw3215_start_io(raw);
 321         else if (raw->queued_write != NULL) {
 322                 if ((raw->queued_write->delayable == 0) ||
 323                     (raw->flags & RAW3215_FLUSHING)) {
 324                         /* execute write requests bigger than minimum size */
 325                         raw3215_start_io(raw);
 326                         if (raw->flags & RAW3215_TIMER_RUNS) {
 327                                 del_timer(&raw->timer);
 328                                 raw->flags &= ~RAW3215_TIMER_RUNS;
 329                         }
 330                 } else if (!(raw->flags & RAW3215_TIMER_RUNS)) {
 331                         /* delay small writes */
 332                         init_timer(&raw->timer);
 333                         raw->timer.expires = RAW3215_TIMEOUT + jiffies;
 334                         raw->timer.data = (unsigned long) raw;
 335                         raw->timer.function = raw3215_timeout;
 336                         add_timer(&raw->timer);
 337                         raw->flags |= RAW3215_TIMER_RUNS;
 338                 }
 339         }
 340 }
 341
 342 /*
 343  * The bottom half handler routine for 3215 devices. It tries to start
 344  * the next IO and wakes up processes waiting on the tty.
 345  */
 346 static void raw3215_softint(void *data)
 347 {
 348         raw3215_info *raw;
 349         struct tty_struct *tty;
 350         unsigned long flags;
 351
 352         raw = (raw3215_info *) data;
 353         s390irq_spin_lock_irqsave(raw->irq, flags);
 354         raw3215_mk_write_req(raw);
 355         raw3215_try_io(raw);
 356         raw->flags &= ~RAW3215_BH_PENDING;
 357         s390irq_spin_unlock_irqrestore(raw->irq, flags);
 358         /* Check for pending message from raw3215_irq */
 359         if (raw->message != NULL) {
 360                 printk(raw->message, raw->irq, raw->msg_dstat, raw->msg_cstat);
 361                 raw->message = NULL;
 362         }
 363         tty = raw->tty;
 364         if (tty != NULL &&
 365             RAW3215_BUFFER_SIZE - raw->count >= RAW3215_MIN_SPACE) {
 366                 tty_wakeup(tty);
 367         }
 368 }
 369
 370 /*
 371  * Function to safely add raw3215_softint to tq_immediate.
 372  * The s390irq spinlock must be held.
 373  */
 374 static inline void raw3215_sched_bh(raw3215_info *raw)
 375 {
 376         if (raw->flags & RAW3215_BH_PENDING)
 377                 return;       /* already pending */
 378         raw->flags |= RAW3215_BH_PENDING;
 379         INIT_LIST_HEAD(&raw->tqueue.list);
 380         raw->tqueue.sync = 0;
 381         raw->tqueue.routine = raw3215_softint;
 382         raw->tqueue.data = raw;
 383         queue_task(&raw->tqueue, &tq_immediate);
 384         mark_bh(IMMEDIATE_BH);
 385 }
 386
 387 /*
 388  * Find the raw3215_info structure associated with irq
 389  */
 390 static inline raw3215_info *raw3215_find_info(int irq) {
 391         raw3215_info *raw;
 392         int i;
 393
 394         for (i = 0; i < NR_3215; i++) {
 395                 raw = raw3215[i];
 396                 if (raw != NULL && raw->irq == irq &&
 397                     (raw->flags & RAW3215_ACTIVE))
 398                         break;
 399         }
 400         return (i >= NR_3215) ? NULL : raw;
 401 }
 402
 403 /*
 404  * Interrupt routine, called from Ingo's I/O layer
 405  */
 406 static void raw3215_irq(int irq, void *int_parm, struct pt_regs *regs)
 407 {
 408         raw3215_info *raw;
 409         raw3215_req *req;
 410         struct tty_struct *tty;
 411         devstat_t *stat;
 412         int cstat, dstat;
 413         int count, slen;
 414
 415         stat = (devstat_t *) int_parm;
 416         req = (raw3215_req *) stat->intparm;
 417         cstat = stat->cstat;
 418         dstat = stat->dstat;
 419         if (cstat != 0) {
 420                 raw = raw3215_find_info(irq);
 421                 if (raw != NULL) {
 422                         raw->message = KERN_WARNING
 423                                 "Got nonzero channel status in raw3215_irq "
 424                                 "(dev %i, dev sts 0x%2x, sch sts 0x%2x)";
 425                         raw->msg_dstat = dstat;
 426                         raw->msg_cstat = cstat;
 427                         raw3215_sched_bh(raw);
 428                 }
 429         }
 430         if (dstat & 0x01) { /* we got a unit exception */
 431                 dstat &= ~0x01;  /* we can ignore it */
 432         }
 433         switch (dstat) {
 434         case 0x80:
 435                 if (cstat != 0)
 436                         break;
 437                 /* Attention interrupt, someone hit the enter key */
 438                 if ((raw = raw3215_find_info(irq)) == NULL)
 439                         return;              /* That shouldn't happen ... */
 440                 /* Setup a read request */
 441                 raw3215_mk_read_req(raw);
 442                 if (MACHINE_IS_P390)
 443                         memset(raw->inbuf, 0, RAW3215_INBUF_SIZE);
 444                 raw3215_sched_bh(raw);
 445                 break;
 446         case 0x08:
 447         case 0x0C:
 448                 /* Channel end interrupt. */
 449                 if ((raw = req->info) == NULL)
 450                         return;              /* That shouldn't happen ... */
 451                 if (req->type == RAW3215_READ) {
 452                         /* store residual count, then wait for device end */
 453                         req->residual = stat->rescnt;
 454                 }
 455                 if (dstat == 0x08)
 456                         break;
 457         case 0x04:
 458                 /* Device end interrupt. */
 459                 if ((raw = req->info) == NULL)
 460                         return;              /* That shouldn't happen ... */
 461                 if (req->type == RAW3215_READ && raw->tty != NULL) {
 462                         unsigned int cchar;
 463
 464                         tty = raw->tty;
 465                         count = 160 - req->residual;
 466                         if (MACHINE_IS_P390) {
 467                                 slen = strnlen(raw->inbuf, RAW3215_INBUF_SIZE);
 468                                 if (count > slen)
 469                                         count = slen;
 470                         } else
 471                         if (count >= TTY_FLIPBUF_SIZE - tty->flip.count)
 472                                 count = TTY_FLIPBUF_SIZE - tty->flip.count - 1;
 473                         EBCASC(raw->inbuf, count);
 474                         cchar = ctrlchar_handle(raw->inbuf, count, tty);
 475                         switch (cchar & CTRLCHAR_MASK) {
 476                         case CTRLCHAR_SYSRQ:
 477                                 break;
 478
 479                         case CTRLCHAR_CTRL:
 480                                 tty->flip.count++;
 481                                 *tty->flip.flag_buf_ptr++ = TTY_NORMAL;
 482                                 *tty->flip.char_buf_ptr++ = cchar;
 483                                 tty_flip_buffer_push(raw->tty);
 484                                 break;
 485
 486                         case CTRLCHAR_NONE:
 487                                 memcpy(tty->flip.char_buf_ptr,
 488                                        raw->inbuf, count);
 489                                 if (count < 2 ||
 490                                     (strncmp(raw->inbuf+count-2, "^n", 2) &&
 491                                     strncmp(raw->inbuf+count-2, "\252n", 2)) ) {
 492                                         /* don't add the auto \n */
 493                                         tty->flip.char_buf_ptr[count] = '\n';
 494                                         memset(tty->flip.flag_buf_ptr,
 495                                                TTY_NORMAL, count + 1);
 496                                         count++;
 497                                 } else
 498                                         count-=2;
 499                                 tty->flip.char_buf_ptr += count;
 500                                 tty->flip.flag_buf_ptr += count;
 501                                 tty->flip.count += count;
 502                                 tty_flip_buffer_push(raw->tty);
 503                                 break;
 504                         }
 505                 } else if (req->type == RAW3215_WRITE) {
 506                         raw->count -= req->len;
 507                         raw->written -= req->len;
 508                 }
 509                 raw->flags &= ~RAW3215_WORKING;
 510                 raw3215_free_req(req);
 511                 /* check for empty wait */
 512                 if (waitqueue_active(&raw->empty_wait) &&
 513                     raw->queued_write == NULL &&
 514                     raw->queued_read == NULL) {
 515                         wake_up_interruptible(&raw->empty_wait);
 516                 }
 517                 raw3215_sched_bh(raw);
 518                 break;
 519         default:
 520                 /* Strange interrupt, I'll do my best to clean up */
 521                 if ((raw = raw3215_find_info(irq)) == NULL)
 522                         return;              /* That shouldn't happen ... */
 523                 if (raw == NULL) break;
 524                 if (req != NULL && req->type != RAW3215_FREE) {
 525                         if (req->type == RAW3215_WRITE) {
 526                                 raw->count -= req->len;
 527                                 raw->written -= req->len;
 528                         }
 529                         raw->flags &= ~RAW3215_WORKING;
 530                         raw3215_free_req(req);
 531                 }
 532                 raw->message = KERN_WARNING
 533                         "Spurious interrupt in in raw3215_irq "
 534                         "(dev %i, dev sts 0x%2x, sch sts 0x%2x)";
 535                 raw->msg_dstat = dstat;
 536                 raw->msg_cstat = cstat;
 537                 raw3215_sched_bh(raw);
 538         }
 539         return;
 540 }
 541
 542 /*
 543  * Wait until length bytes are available int the output buffer.
 544  * Has to be called with the s390irq lock held. Can be called
 545  * disabled.
 546  */
 547 void raw3215_make_room(raw3215_info *raw, unsigned int length)
 548 {
 549         while (RAW3215_BUFFER_SIZE - raw->count < length) {
 550                 /* there might be a request pending */
 551                 raw->flags |= RAW3215_FLUSHING;
 552                 raw3215_mk_write_req(raw);
 553                 raw3215_try_io(raw);
 554                 raw->flags &= ~RAW3215_FLUSHING;
 555                 if (wait_cons_dev(raw->irq) != 0) {
 556                         /* that shouldn't happen */
 557                         raw->count = 0;
 558                         raw->written = 0;
 559                 }
 560                 /* Enough room freed up ? */
 561                 if (RAW3215_BUFFER_SIZE - raw->count >= length)
 562                         break;
 563                 /* there might be another cpu waiting for the lock */
 564                 s390irq_spin_unlock(raw->irq);
 565                 udelay(100);
 566                 s390irq_spin_lock(raw->irq);
 567         }
 568 }
 569
 570 /*
 571  * String write routine for 3215 devices
 572  */
 573 static int
 574 raw3215_write(raw3215_info *raw, const char *str,
 575               int from_user, unsigned int length)
 576 {
 577         unsigned long flags;
 578         int ret, c;
 579         int count;
 580
 581         ret = 0;
 582         while (length > 0) {
 583                 s390irq_spin_lock_irqsave(raw->irq, flags);
 584                 count = (length > RAW3215_BUFFER_SIZE) ?
 585                                              RAW3215_BUFFER_SIZE : length;
 586                 length -= count;
 587
 588                 raw3215_make_room(raw, count);
 589
 590                 /* copy string to output buffer and convert it to EBCDIC */
 591                 if (from_user) {
 592                         while (1) {
 593                                 c = MIN(count,
 594                                         MIN(RAW3215_BUFFER_SIZE - raw->count,
 595                                             RAW3215_BUFFER_SIZE - raw->head));
 596                                 if (c <= 0)
 597                                         break;
 598                                 c -= copy_from_user(raw->buffer + raw->head,
 599                                                     str, c);
 600                                 if (c == 0) {
 601                                         if (!ret)
 602                                                 ret = -EFAULT;
 603                                         break;
 604                                 }
 605                                 ASCEBC(raw->buffer + raw->head, c);
 606                                 raw->head = (raw->head + c) &
 607                                             (RAW3215_BUFFER_SIZE - 1);
 608                                 raw->count += c;
 609                                 raw->line_pos += c;
 610                                 str += c;
 611                                 count -= c;
 612                                 ret += c;
 613                         }
 614                 } else {
 615                         while (1) {
 616                                 c = MIN(count,
 617                                         MIN(RAW3215_BUFFER_SIZE - raw->count,
 618                                             RAW3215_BUFFER_SIZE - raw->head));
 619                                 if (c <= 0)
 620                                         break;
 621                                 memcpy(raw->buffer + raw->head, str, c);
 622                                 ASCEBC(raw->buffer + raw->head, c);
 623                                 raw->head = (raw->head + c) &
 624                                             (RAW3215_BUFFER_SIZE - 1);
 625                                 raw->count += c;
 626                                 raw->line_pos += c;
 627                                 str += c;
 628                                 count -= c;
 629                                 ret += c;
 630                         }
 631                 }
 632                 if (!(raw->flags & RAW3215_WORKING)) {
 633                         raw3215_mk_write_req(raw);
 634                         /* start or queue request */
 635                         raw3215_try_io(raw);
 636                 }
 637                 s390irq_spin_unlock_irqrestore(raw->irq, flags);
 638         }
 639
 640         return ret;
 641 }
 642
 643 /*
 644  * Put character routine for 3215 devices
 645  */
 646
 647 static void raw3215_putchar(raw3215_info *raw, unsigned char ch)
 648 {
 649         unsigned long flags;
 650         unsigned int length, i;
 651
 652         s390irq_spin_lock_irqsave(raw->irq, flags);
 653         if (ch == '\t') {
 654                 length = TAB_STOP_SIZE - (raw->line_pos%TAB_STOP_SIZE);
 655                 raw->line_pos += length;
 656                 ch = ' ';
 657         } else if (ch == '\n') {
 658                 length = 1;
 659                 raw->line_pos = 0;
 660         } else {
 661                 length = 1;
 662                 raw->line_pos++;
 663         }
 664         raw3215_make_room(raw, length);
 665
 666         for (i = 0; i < length; i++) {
 667                 raw->buffer[raw->head] = (char) _ascebc[(int) ch];
 668                 raw->head = (raw->head + 1) & (RAW3215_BUFFER_SIZE - 1);
 669                 raw->count++;
 670         }
 671         if (!(raw->flags & RAW3215_WORKING)) {
 672                 raw3215_mk_write_req(raw);
 673                 /* start or queue request */
 674                 raw3215_try_io(raw);
 675         }
 676         s390irq_spin_unlock_irqrestore(raw->irq, flags);
 677 }
 678
 679 /*
 680  * Flush routine, it simply sets the flush flag and tries to start
 681  * pending IO.
 682  */
 683 static void raw3215_flush_buffer(raw3215_info *raw)
 684 {
 685         unsigned long flags;
 686
 687         s390irq_spin_lock_irqsave(raw->irq, flags);
 688         if (raw->count > 0) {
 689                 raw->flags |= RAW3215_FLUSHING;
 690                 raw3215_try_io(raw);
 691                 raw->flags &= ~RAW3215_FLUSHING;
 692         }
 693         s390irq_spin_unlock_irqrestore(raw->irq, flags);
 694 }
 695
 696 /*
 697  * Fire up a 3215 device.
 698  */
 699 static int raw3215_startup(raw3215_info *raw)
 700 {
 701         unsigned long flags;
 702
 703         if (raw->flags & RAW3215_ACTIVE)
 704                 return 0;
 705         if (request_irq(raw->irq, raw3215_irq, SA_INTERRUPT,
 706                         "3215 terminal driver", &raw->devstat) != 0)
 707                 return -1;
 708         raw->line_pos = 0;
 709         raw->flags |= RAW3215_ACTIVE;
 710         s390irq_spin_lock_irqsave(raw->irq, flags);
 711         set_cons_dev(raw->irq);
 712         raw3215_try_io(raw);
 713         s390irq_spin_unlock_irqrestore(raw->irq, flags);
 714
 715         return 0;
 716 }
 717
 718 /*
 719  * Shutdown a 3215 device.
 720  */
 721 static void raw3215_shutdown(raw3215_info *raw)
 722 {
 723         DECLARE_WAITQUEUE(wait, current);
 724         unsigned long flags;
 725
 726         if (!(raw->flags & RAW3215_ACTIVE) || (raw->flags & RAW3215_FIXED))
 727                 return;
 728         /* Wait for outstanding requests, then free irq */
 729         s390irq_spin_lock_irqsave(raw->irq, flags);
 730         if ((raw->flags & RAW3215_WORKING) ||
 731             raw->queued_write != NULL ||
 732             raw->queued_read != NULL) {
 733                 raw->flags |= RAW3215_CLOSING;
 734                 add_wait_queue(&raw->empty_wait, &wait);
 735                 current->state = TASK_INTERRUPTIBLE;
 736                 s390irq_spin_unlock_irqrestore(raw->irq, flags);
 737                 schedule();
 738                 s390irq_spin_lock_irqsave(raw->irq, flags);
 739                 remove_wait_queue(&raw->empty_wait, &wait);
 740                 current->state = TASK_RUNNING;
 741                 raw->flags &= ~(RAW3215_ACTIVE | RAW3215_CLOSING);
 742         }
 743         free_irq(raw->irq, NULL);
 744         s390irq_spin_unlock_irqrestore(raw->irq, flags);
 745 }
 746
 747 static int
 748 raw3215_find_dev(int number)
 749 {
 750         s390_dev_info_t dinfo;
 751         int irq;
 752         int count;
 753
 754         irq = get_irq_first();
 755         count = 0;
 756         while (count <= number && irq != -ENODEV) {
 757                 if (get_dev_info(irq, &dinfo) == -ENODEV)
 758                         break;
 759                 if (dinfo.devno == console_device ||
 760                     dinfo.sid_data.cu_type == 0x3215) {
 761                         count++;
 762                     if (count > number)
 763                         return irq;
 764                 }
 765                 irq = get_irq_next(irq);
 766         }
 767         return -1;            /* console not found */
 768 }
 769
 770 #ifdef CONFIG_TN3215_CONSOLE
 771
 772 /*
 773  * Write a string to the 3215 console
 774  */
 775 static void
 776 con3215_write(struct console *co, const char *str, unsigned int count)
 777 {
 778         raw3215_info *raw;
 779         int i;
 780
 781         if (count <= 0)
 782                 return;
 783         raw = raw3215[0];       /* console 3215 is the first one */
 784         while (count > 0) {
 785                 for (i = 0; i < count; i++)
 786                         if (str[i] == '\t' || str[i] == '\n')
 787                                 break;
 788                 raw3215_write(raw, str, 0, i);
 789                 count -= i;
 790                 str += i;
 791                 if (count > 0) {
 792                         raw3215_putchar(raw, *str);
 793                         count--;
 794                         str++;
 795                 }
 796         }
 797 }
 798
 799 kdev_t con3215_device(struct console *c)
 800 {
 801         return MKDEV(TTY_MAJOR, c->index + 64 );
 802 }
 803
 804 /*
 805  * panic() calls console_unblank before the system enters a
 806  * disabled, endless loop.
 807  */
 808 void con3215_unblank(void)
 809 {
 810         raw3215_info *raw;
 811         unsigned long flags;
 812
 813         raw = raw3215[0];  /* console 3215 is the first one */
 814         s390irq_spin_lock_irqsave(raw->irq, flags);
 815         raw3215_make_room(raw, RAW3215_BUFFER_SIZE);
 816         s390irq_spin_unlock_irqrestore(raw->irq, flags);
 817 }
 818
 819 static int __init con3215_consetup(struct console *co, char *options)
 820 {
 821         return 0;
 822 }
 823
 824 /*
 825  *  The console structure for the 3215 console
 826  */
 827 static struct console con3215 = {
 828         name:           "ttyS",
 829         index:          0,
 830         write:          con3215_write,
 831         device:         con3215_device,
 832         unblank:        con3215_unblank,
 833         setup:          con3215_consetup,
 834         flags:          CON_PRINTBUFFER,
 835 };
 836
 837 #endif
 838
 839 /*
 840  * tty3215_open
 841  *
 842  * This routine is called whenever a 3215 tty is opened.
 843  */
 844 static int tty3215_open(struct tty_struct *tty, struct file * filp)
 845 {
 846         raw3215_info *raw;
 847         int retval, line;
 848
 849         line = MINOR(tty->device) - tty->driver.minor_start;
 850         if ((line < 0) || (line >= NR_3215))
 851                 return -ENODEV;
 852
 853         raw = raw3215[line];
 854         if (raw == NULL) {
 855                 raw = kmalloc(sizeof(raw3215_info) +
 856                               RAW3215_INBUF_SIZE, GFP_KERNEL|GFP_DMA);
 857                 if (raw == NULL)
 858                         return -ENOMEM;
 859                 raw->irq = raw3215_find_dev(line);
 860                 if (raw->irq == -1) {
 861                         kfree(raw);
 862                         return -ENODEV;
 863                 }
 864                 raw->inbuf = (char *) raw + sizeof(raw3215_info);
 865                 memset(raw, 0, sizeof(raw3215_info));
 866                 raw->buffer = (char *) kmalloc(RAW3215_BUFFER_SIZE,
 867                                                GFP_KERNEL|GFP_DMA);
 868                 if (raw->buffer == NULL) {
 869                         kfree(raw);
 870                         return -ENOMEM;
 871                 }
 872                 raw->tqueue.routine = raw3215_softint;
 873                 raw->tqueue.data = raw;
 874                 init_waitqueue_head(&raw->empty_wait);
 875                 raw3215[line] = raw;
 876         }
 877
 878         tty->driver_data = raw;
 879         raw->tty = tty;
 880
 881         tty->low_latency = 0;  /* don't use bottom half for pushing chars */
 882         /*
 883          * Start up 3215 device
 884          */
 885         retval = raw3215_startup(raw);
 886         if (retval)
 887                 return retval;
 888
 889         return 0;
 890 }
 891
 892 /*
 893  * tty3215_close()
 894  *
 895  * This routine is called when the 3215 tty is closed. We wait
 896  * for the remaining request to be completed. Then we clean up.
 897  */
 898 static void tty3215_close(struct tty_struct *tty, struct file * filp)
 899 {
 900         raw3215_info *raw;
 901
 902         raw = (raw3215_info *) tty->driver_data;
 903         if (raw == NULL || tty->count > 1)
 904                 return;
 905         tty->closing = 1;
 906         /* Shutdown the terminal */
 907         raw3215_shutdown(raw);
 908         tty->closing = 0;
 909         raw->tty = NULL;
 910 }
 911
 912 /*
 913  * Returns the amount of free space in the output buffer.
 914  */
 915 static int tty3215_write_room(struct tty_struct *tty)
 916 {
 917         raw3215_info *raw;
 918
 919         raw = (raw3215_info *) tty->driver_data;
 920
 921         /* Subtract TAB_STOP_SIZE to allow for a tab, 8 <<< 64K */
 922         if ((RAW3215_BUFFER_SIZE - raw->count - TAB_STOP_SIZE) >= 0)
 923                 return RAW3215_BUFFER_SIZE - raw->count - TAB_STOP_SIZE;
 924         else
 925                 return 0;
 926 }
 927
 928 /*
 929  * String write routine for 3215 ttys
 930  */
 931 static int tty3215_write(struct tty_struct * tty, int from_user,
 932                     const unsigned char *buf, int count)
 933 {
 934         raw3215_info *raw;
 935         int ret = 0;
 936
 937         if (!tty)
 938                 return 0;
 939         raw = (raw3215_info *) tty->driver_data;
 940         ret = raw3215_write(raw, buf, from_user, count);
 941         return ret;
 942 }
 943
 944 /*
 945  * Put character routine for 3215 ttys
 946  */
 947 static void tty3215_put_char(struct tty_struct *tty, unsigned char ch)
 948 {
 949         raw3215_info *raw;
 950
 951         if (!tty)
 952                 return;
 953         raw = (raw3215_info *) tty->driver_data;
 954         raw3215_putchar(raw, ch);
 955 }
 956
 957 static void tty3215_flush_chars(struct tty_struct *tty)
 958 {
 959 }
 960
 961 /*
 962  * Returns the number of characters in the output buffer
 963  */
 964 static int tty3215_chars_in_buffer(struct tty_struct *tty)
 965 {
 966         raw3215_info *raw;
 967
 968         raw = (raw3215_info *) tty->driver_data;
 969         return raw->count;
 970 }
 971
 972 static void tty3215_flush_buffer(struct tty_struct *tty)
 973 {
 974         raw3215_info *raw;
 975
 976         raw = (raw3215_info *) tty->driver_data;
 977         raw3215_flush_buffer(raw);
 978         tty_wakeup(tty);
 979 }
 980
 981 /*
 982  * Currently we don't have any io controls for 3215 ttys
 983  */
 984 static int tty3215_ioctl(struct tty_struct *tty, struct file * file,
 985                     unsigned int cmd, unsigned long arg)
 986 {
 987         if (tty->flags & (1 << TTY_IO_ERROR))
 988                 return -EIO;
 989
 990         switch (cmd) {
 991         default:
 992                 return -ENOIOCTLCMD;
 993         }
 994         return 0;
 995 }
 996
 997 /*
 998  * Disable reading from a 3215 tty
 999  */
1000 static void tty3215_throttle(struct tty_struct * tty)
1001 {
1002         raw3215_info *raw;
1003
1004         raw = (raw3215_info *) tty->driver_data;
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         raw3215_info *raw;
1014         unsigned long flags;
1015
1016         raw = (raw3215_info *) tty->driver_data;
1017         if (raw->flags & RAW3215_THROTTLED) {
1018                 s390irq_spin_lock_irqsave(raw->irq, flags);
1019                 raw->flags &= ~RAW3215_THROTTLED;
1020                 raw3215_try_io(raw);
1021                 s390irq_spin_unlock_irqrestore(raw->irq, flags);
1022         }
1023 }
1024
1025 /*
1026  * Disable writing to a 3215 tty
1027  */
1028 static void tty3215_stop(struct tty_struct *tty)
1029 {
1030         raw3215_info *raw;
1031
1032         raw = (raw3215_info *) tty->driver_data;
1033         raw->flags |= RAW3215_STOPPED;
1034 }
1035
1036 /*
1037  * Enable writing to a 3215 tty
1038  */
1039 static void tty3215_start(struct tty_struct *tty)
1040 {
1041         raw3215_info *raw;
1042         unsigned long flags;
1043
1044         raw = (raw3215_info *) tty->driver_data;
1045         if (raw->flags & RAW3215_STOPPED) {
1046                 s390irq_spin_lock_irqsave(raw->irq, flags);
1047                 raw->flags &= ~RAW3215_STOPPED;
1048                 raw3215_try_io(raw);
1049                 s390irq_spin_unlock_irqrestore(raw->irq, flags);
1050         }
1051 }
1052
1053
1054 /*
1055  * 3215 console initialization code called from console_init().
1056  * NOTE: This is called before kmalloc is available.
1057  */
1058 void __init con3215_init(void)
1059 {
1060         raw3215_info *raw;
1061         raw3215_req *req;
1062         int irq;
1063         int i;
1064
1065         /* Check if 3215 is to be the console */
1066         if (!CONSOLE_IS_3215)
1067                 return;
1068         irq = raw3215_find_dev(0);
1069
1070         /* Set the console mode for VM */
1071         if (MACHINE_IS_VM) {
1072                 cpcmd("TERM CONMODE 3215", NULL, 0);
1073                 cpcmd("TERM AUTOCR OFF", NULL, 0);
1074         }
1075
1076         /* allocate 3215 request structures */
1077         raw3215_freelist = NULL;
1078         spin_lock_init(&raw3215_freelist_lock);
1079         for (i = 0; i < NR_3215_REQ; i++) {
1080                 req = (raw3215_req *) alloc_bootmem_low(sizeof(raw3215_req));
1081                 req->next = raw3215_freelist;
1082                 raw3215_freelist = req;
1083         }
1084
1085         ctrlchar_init();
1086
1087 #ifdef CONFIG_TN3215_CONSOLE
1088         raw3215[0] = raw = (raw3215_info *)
1089                 alloc_bootmem_low(sizeof(raw3215_info));
1090         memset(raw, 0, sizeof(raw3215_info));
1091         raw->buffer = (char *) alloc_bootmem_low(RAW3215_BUFFER_SIZE);
1092         raw->inbuf = (char *) alloc_bootmem_low(RAW3215_INBUF_SIZE);
1093
1094         /* Find the first console */
1095         raw->irq = raw3215_find_dev(0);
1096         raw->flags |= RAW3215_FIXED;
1097         raw->tqueue.routine = raw3215_softint;
1098         raw->tqueue.data = raw;
1099         init_waitqueue_head(&raw->empty_wait);
1100
1101         /* Request the console irq */
1102         if ( raw3215_startup(raw) != 0 )
1103                 raw->irq = -1;
1104
1105         if (raw->irq != -1) {
1106                 register_console(&con3215);
1107         } else {
1108                 free_bootmem((unsigned long) raw->inbuf, RAW3215_INBUF_SIZE);
1109                 free_bootmem((unsigned long) raw->buffer, RAW3215_BUFFER_SIZE);
1110                 free_bootmem((unsigned long) raw, sizeof(raw3215_info));
1111                 raw3215[0] = NULL;
1112                 printk("Couldn't find a 3215 console device\n");
1113         }
1114 #endif
1115 }
1116
1117 /*
1118  * 3215 tty registration code called from tty_init().
1119  * Most kernel services (incl. kmalloc) are available at this poimt.
1120  */
1121 void __init tty3215_init(void)
1122 {
1123         /* Don't bother registering the tty if we already skipped the console */
1124         if (!CONSOLE_IS_3215)
1125                 return;
1126         /*
1127          * Initialize the tty_driver structure
1128          * Entries in tty3215_driver that are NOT initialized:
1129          * proc_entry, set_termios, flush_buffer, set_ldisc, write_proc
1130          */
1131
1132         memset(&tty3215_driver, 0, sizeof(struct tty_driver));
1133         tty3215_driver.magic = TTY_DRIVER_MAGIC;
1134         tty3215_driver.driver_name = "tty3215";
1135         tty3215_driver.name = "ttyS";
1136         tty3215_driver.name_base = 0;
1137         tty3215_driver.major = TTY_MAJOR;
1138         tty3215_driver.minor_start = 64;
1139         tty3215_driver.num = NR_3215;
1140         tty3215_driver.type = TTY_DRIVER_TYPE_SYSTEM;
1141         tty3215_driver.subtype = SYSTEM_TYPE_TTY;
1142         tty3215_driver.init_termios = tty_std_termios;
1143         tty3215_driver.init_termios.c_iflag = IGNBRK | IGNPAR;
1144         tty3215_driver.init_termios.c_oflag = ONLCR | XTABS;
1145         tty3215_driver.init_termios.c_lflag = ISIG;
1146         tty3215_driver.flags = TTY_DRIVER_REAL_RAW;
1147         tty3215_driver.refcount = &tty3215_refcount;
1148         tty3215_driver.table = tty3215_table;
1149         tty3215_driver.termios = tty3215_termios;
1150         tty3215_driver.termios_locked = tty3215_termios_locked;
1151
1152         tty3215_driver.open = tty3215_open;
1153         tty3215_driver.close = tty3215_close;
1154         tty3215_driver.write = tty3215_write;
1155         tty3215_driver.put_char = tty3215_put_char;
1156         tty3215_driver.flush_chars = tty3215_flush_chars;
1157         tty3215_driver.write_room = tty3215_write_room;
1158         tty3215_driver.chars_in_buffer = tty3215_chars_in_buffer;
1159         tty3215_driver.flush_buffer = tty3215_flush_buffer;
1160         tty3215_driver.ioctl = tty3215_ioctl;
1161         tty3215_driver.throttle = tty3215_throttle;
1162         tty3215_driver.unthrottle = tty3215_unthrottle;
1163         tty3215_driver.send_xchar = NULL;
1164         tty3215_driver.set_termios = NULL;
1165         tty3215_driver.stop = tty3215_stop;
1166         tty3215_driver.start = tty3215_start;
1167         tty3215_driver.hangup = NULL;
1168         tty3215_driver.break_ctl = NULL;
1169         tty3215_driver.wait_until_sent = NULL;
1170         tty3215_driver.read_proc = NULL;
1171
1172         if (tty_register_driver(&tty3215_driver))
1173                 panic("Couldn't register tty3215 driver\n");
1174 }