drivers/s390/char/con3270.c

   1 /*
   2  *  drivers/s390/char/con3270.c
   3  *    IBM/3270 Driver - console view.
   4  *
   5  *  Author(s):
   6  *    Original 3270 Code for 2.4 written by Richard Hitt (UTS Global)
   7  *    Rewritten for 2.5 by Martin Schwidefsky <schwidefsky@de.ibm.com>
   8  *      -- Copyright (C) 2003 IBM Deutschland Entwicklung GmbH, IBM Corporation
   9  */
  10
  11 #include <linux/bootmem.h>
  12 #include <linux/console.h>
  13 #include <linux/init.h>
  14 #include <linux/interrupt.h>
  15 #include <linux/list.h>
  16 #include <linux/types.h>
  17 #include <linux/err.h>
  18
  19 #include <asm/ccwdev.h>
  20 #include <asm/cio.h>
  21 #include <asm/cpcmd.h>
  22 #include <asm/ebcdic.h>
  23
  24 #include "raw3270.h"
  25 #include "ctrlchar.h"
  26
  27 #define CON3270_OUTPUT_BUFFER_SIZE 1024
  28 #define CON3270_STRING_PAGES 4
  29
  30 static struct raw3270_fn con3270_fn;
  31
  32 /*
  33  * Main 3270 console view data structure.
  34  */
  35 struct con3270 {
  36         struct raw3270_view view;
  37         spinlock_t lock;
  38         struct list_head freemem;       /* list of free memory for strings. */
  39
  40         /* Output stuff. */
  41         struct list_head lines;         /* list of lines. */
  42         struct list_head update;        /* list of lines to update. */
  43         int line_nr;                    /* line number for next update. */
  44         int nr_lines;                   /* # lines in list. */
  45         int nr_up;                      /* # lines up in history. */
  46         unsigned long update_flags;     /* Update indication bits. */
  47         struct string *cline;           /* current output line. */
  48         struct string *status;          /* last line of display. */
  49         struct raw3270_request *write;  /* single write request. */
  50         struct timer_list timer;
  51
  52         /* Input stuff. */
  53         struct string *input;           /* input string for read request. */
  54         struct raw3270_request *read;   /* single read request. */
  55         struct raw3270_request *kreset; /* single keyboard reset request. */
  56         struct tasklet_struct readlet;  /* tasklet to issue read request. */
  57 };
  58
  59 static struct con3270 *condev;
  60
  61 /* con3270->update_flags. See con3270_update for details. */
  62 #define CON_UPDATE_ERASE        1       /* Use EWRITEA instead of WRITE. */
  63 #define CON_UPDATE_LIST         2       /* Update lines in tty3270->update. */
  64 #define CON_UPDATE_STATUS       4       /* Update status line. */
  65 #define CON_UPDATE_ALL          7
  66
  67 static void con3270_update(struct con3270 *);
  68
  69 /*
  70  * Setup timeout for a device. On timeout trigger an update.
  71  */
  72 static void con3270_set_timer(struct con3270 *cp, int expires)
  73 {
  74         if (expires == 0) {
  75                 if (timer_pending(&cp->timer))
  76                         del_timer(&cp->timer);
  77                 return;
  78         }
  79         if (timer_pending(&cp->timer) &&
  80             mod_timer(&cp->timer, jiffies + expires))
  81                 return;
  82         cp->timer.function = (void (*)(unsigned long)) con3270_update;
  83         cp->timer.data = (unsigned long) cp;
  84         cp->timer.expires = jiffies + expires;
  85         add_timer(&cp->timer);
  86 }
  87
  88 /*
  89  * The status line is the last line of the screen. It shows the string
  90  * "console view" in the lower left corner and "Running"/"More..."/"Holding"
  91  * in the lower right corner of the screen.
  92  */
  93 static void
  94 con3270_update_status(struct con3270 *cp)
  95 {
  96         char *str;
  97
  98         str = (cp->nr_up != 0) ? "History" : "Running";
  99         memcpy(cp->status->string + 24, str, 7);
 100         codepage_convert(cp->view.ascebc, cp->status->string + 24, 7);
 101         cp->update_flags |= CON_UPDATE_STATUS;
 102 }
 103
 104 static void
 105 con3270_create_status(struct con3270 *cp)
 106 {
 107         static const unsigned char blueprint[] =
 108                 { TO_SBA, 0, 0, TO_SF,TF_LOG,TO_SA,TAT_COLOR, TAC_GREEN,
 109                   'c','o','n','s','o','l','e',' ','v','i','e','w',
 110                   TO_RA,0,0,0,'R','u','n','n','i','n','g',TO_SF,TF_LOG };
 111
 112         cp->status = alloc_string(&cp->freemem, sizeof(blueprint));
 113         /* Copy blueprint to status line */
 114         memcpy(cp->status->string, blueprint, sizeof(blueprint));
 115         /* Set TO_RA addresses. */
 116         raw3270_buffer_address(cp->view.dev, cp->status->string + 1,
 117                                cp->view.cols * (cp->view.rows - 1));
 118         raw3270_buffer_address(cp->view.dev, cp->status->string + 21,
 119                                cp->view.cols * cp->view.rows - 8);
 120         /* Convert strings to ebcdic. */
 121         codepage_convert(cp->view.ascebc, cp->status->string + 8, 12);
 122         codepage_convert(cp->view.ascebc, cp->status->string + 24, 7);
 123 }
 124
 125 /*
 126  * Set output offsets to 3270 datastream fragment of a console string.
 127  */
 128 static void
 129 con3270_update_string(struct con3270 *cp, struct string *s, int nr)
 130 {
 131         if (s->len >= cp->view.cols - 5)
 132                 return;
 133         raw3270_buffer_address(cp->view.dev, s->string + s->len - 3,
 134                                cp->view.cols * (nr + 1));
 135 }
 136
 137 /*
 138  * Rebuild update list to print all lines.
 139  */
 140 static void
 141 con3270_rebuild_update(struct con3270 *cp)
 142 {
 143         struct string *s, *n;
 144         int nr;
 145
 146         /*
 147          * Throw away update list and create a new one,
 148          * containing all lines that will fit on the screen.
 149          */
 150         list_for_each_entry_safe(s, n, &cp->update, update)
 151                 list_del_init(&s->update);
 152         nr = cp->view.rows - 2 + cp->nr_up;
 153         list_for_each_entry_reverse(s, &cp->lines, list) {
 154                 if (nr < cp->view.rows - 1)
 155                         list_add(&s->update, &cp->update);
 156                 if (--nr < 0)
 157                         break;
 158         }
 159         cp->line_nr = 0;
 160         cp->update_flags |= CON_UPDATE_LIST;
 161 }
 162
 163 /*
 164  * Alloc string for size bytes. Free strings from history if necessary.
 165  */
 166 static struct string *
 167 con3270_alloc_string(struct con3270 *cp, size_t size)
 168 {
 169         struct string *s, *n;
 170
 171         s = alloc_string(&cp->freemem, size);
 172         if (s)
 173                 return s;
 174         list_for_each_entry_safe(s, n, &cp->lines, list) {
 175                 list_del(&s->list);
 176                 if (!list_empty(&s->update))
 177                         list_del(&s->update);
 178                 cp->nr_lines--;
 179                 if (free_string(&cp->freemem, s) >= size)
 180                         break;
 181         }
 182         s = alloc_string(&cp->freemem, size);
 183         BUG_ON(!s);
 184         if (cp->nr_up != 0 && cp->nr_up + cp->view.rows > cp->nr_lines) {
 185                 cp->nr_up = cp->nr_lines - cp->view.rows + 1;
 186                 con3270_rebuild_update(cp);
 187                 con3270_update_status(cp);
 188         }
 189         return s;
 190 }
 191
 192 /*
 193  * Write completion callback.
 194  */
 195 static void
 196 con3270_write_callback(struct raw3270_request *rq, void *data)
 197 {
 198         raw3270_request_reset(rq);
 199         xchg(&((struct con3270 *) rq->view)->write, rq);
 200 }
 201
 202 /*
 203  * Update console display.
 204  */
 205 static void
 206 con3270_update(struct con3270 *cp)
 207 {
 208         struct raw3270_request *wrq;
 209         char wcc, prolog[6];
 210         unsigned long flags;
 211         unsigned long updated;
 212         struct string *s, *n;
 213         int rc;
 214
 215         if (cp->view.dev)
 216                 raw3270_activate_view(&cp->view);
 217
 218         wrq = xchg(&cp->write, 0);
 219         if (!wrq) {
 220                 con3270_set_timer(cp, 1);
 221                 return;
 222         }
 223
 224         spin_lock_irqsave(&cp->view.lock, flags);
 225         updated = 0;
 226         if (cp->update_flags & CON_UPDATE_ERASE) {
 227                 /* Use erase write alternate to initialize display. */
 228                 raw3270_request_set_cmd(wrq, TC_EWRITEA);
 229                 updated |= CON_UPDATE_ERASE;
 230         } else
 231                 raw3270_request_set_cmd(wrq, TC_WRITE);
 232
 233         wcc = TW_NONE;
 234         raw3270_request_add_data(wrq, &wcc, 1);
 235
 236         /*
 237          * Update status line.
 238          */
 239         if (cp->update_flags & CON_UPDATE_STATUS)
 240                 if (raw3270_request_add_data(wrq, cp->status->string,
 241                                              cp->status->len) == 0)
 242                         updated |= CON_UPDATE_STATUS;
 243
 244         if (cp->update_flags & CON_UPDATE_LIST) {
 245                 prolog[0] = TO_SBA;
 246                 prolog[3] = TO_SA;
 247                 prolog[4] = TAT_COLOR;
 248                 prolog[5] = TAC_TURQ;
 249                 raw3270_buffer_address(cp->view.dev, prolog + 1,
 250                                        cp->view.cols * cp->line_nr);
 251                 raw3270_request_add_data(wrq, prolog, 6);
 252                 /* Write strings in the update list to the screen. */
 253                 list_for_each_entry_safe(s, n, &cp->update, update) {
 254                         if (s != cp->cline)
 255                                 con3270_update_string(cp, s, cp->line_nr);
 256                         if (raw3270_request_add_data(wrq, s->string,
 257                                                      s->len) != 0)
 258                                 break;
 259                         list_del_init(&s->update);
 260                         if (s != cp->cline)
 261                                 cp->line_nr++;
 262                 }
 263                 if (list_empty(&cp->update))
 264                         updated |= CON_UPDATE_LIST;
 265         }
 266         wrq->callback = con3270_write_callback;
 267         rc = raw3270_start(&cp->view, wrq);
 268         if (rc == 0) {
 269                 cp->update_flags &= ~updated;
 270                 if (cp->update_flags)
 271                         con3270_set_timer(cp, 1);
 272         } else {
 273                 raw3270_request_reset(wrq);
 274                 xchg(&cp->write, wrq);
 275         }
 276         spin_unlock_irqrestore(&cp->view.lock, flags);
 277 }
 278
 279 /*
 280  * Read tasklet.
 281  */
 282 static void
 283 con3270_read_tasklet(struct raw3270_request *rrq)
 284 {
 285         static char kreset_data = TW_KR;
 286         struct con3270 *cp;
 287         unsigned long flags;
 288         int nr_up, deactivate;
 289
 290         cp = (struct con3270 *) rrq->view;
 291         spin_lock_irqsave(&cp->view.lock, flags);
 292         nr_up = cp->nr_up;
 293         deactivate = 0;
 294         /* Check aid byte. */
 295         switch (cp->input->string[0]) {
 296         case 0x7d:      /* enter: jump to bottom. */
 297                 nr_up = 0;
 298                 break;
 299         case 0xf3:      /* PF3: deactivate the console view. */
 300                 deactivate = 1;
 301                 break;
 302         case 0x6d:      /* clear: start from scratch. */
 303                 con3270_rebuild_update(cp);
 304                 cp->update_flags = CON_UPDATE_ALL;
 305                 con3270_set_timer(cp, 1);
 306                 break;
 307         case 0xf7:      /* PF7: do a page up in the console log. */
 308                 nr_up += cp->view.rows - 2;
 309                 if (nr_up + cp->view.rows - 1 > cp->nr_lines) {
 310                         nr_up = cp->nr_lines - cp->view.rows + 1;
 311                         if (nr_up < 0)
 312                                 nr_up = 0;
 313                 }
 314                 break;
 315         case 0xf8:      /* PF8: do a page down in the console log. */
 316                 nr_up -= cp->view.rows - 2;
 317                 if (nr_up < 0)
 318                         nr_up = 0;
 319                 break;
 320         }
 321         if (nr_up != cp->nr_up) {
 322                 cp->nr_up = nr_up;
 323                 con3270_rebuild_update(cp);
 324                 con3270_update_status(cp);
 325                 con3270_set_timer(cp, 1);
 326         }
 327         spin_unlock_irqrestore(&cp->view.lock, flags);
 328
 329         /* Start keyboard reset command. */
 330         raw3270_request_reset(cp->kreset);
 331         raw3270_request_set_cmd(cp->kreset, TC_WRITE);
 332         raw3270_request_add_data(cp->kreset, &kreset_data, 1);
 333         raw3270_start(&cp->view, cp->kreset);
 334
 335         if (deactivate)
 336                 raw3270_deactivate_view(&cp->view);
 337
 338         raw3270_request_reset(rrq);
 339         xchg(&cp->read, rrq);
 340         raw3270_put_view(&cp->view);
 341 }
 342
 343 /*
 344  * Read request completion callback.
 345  */
 346 static void
 347 con3270_read_callback(struct raw3270_request *rq, void *data)
 348 {
 349         raw3270_get_view(rq->view);
 350         /* Schedule tasklet to pass input to tty. */
 351         tasklet_schedule(&((struct con3270 *) rq->view)->readlet);
 352 }
 353
 354 /*
 355  * Issue a read request. Called only from interrupt function.
 356  */
 357 static void
 358 con3270_issue_read(struct con3270 *cp)
 359 {
 360         struct raw3270_request *rrq;
 361         int rc;
 362
 363         rrq = xchg(&cp->read, 0);
 364         if (!rrq)
 365                 /* Read already scheduled. */
 366                 return;
 367         rrq->callback = con3270_read_callback;
 368         rrq->callback_data = cp;
 369         raw3270_request_set_cmd(rrq, TC_READMOD);
 370         raw3270_request_set_data(rrq, cp->input->string, cp->input->len);
 371         /* Issue the read modified request. */
 372         rc = raw3270_start_irq(&cp->view, rrq);
 373         if (rc)
 374                 raw3270_request_reset(rrq);
 375 }
 376
 377 /*
 378  * Switch to the console view.
 379  */
 380 static int
 381 con3270_activate(struct raw3270_view *view)
 382 {
 383         unsigned long flags;
 384         struct con3270 *cp;
 385
 386         cp = (struct con3270 *) view;
 387         spin_lock_irqsave(&cp->view.lock, flags);
 388         cp->nr_up = 0;
 389         con3270_rebuild_update(cp);
 390         con3270_update_status(cp);
 391         cp->update_flags = CON_UPDATE_ALL;
 392         con3270_set_timer(cp, 1);
 393         spin_unlock_irqrestore(&cp->view.lock, flags);
 394         return 0;
 395 }
 396
 397 static void
 398 con3270_deactivate(struct raw3270_view *view)
 399 {
 400         unsigned long flags;
 401         struct con3270 *cp;
 402
 403         cp = (struct con3270 *) view;
 404         spin_lock_irqsave(&cp->view.lock, flags);
 405         del_timer(&cp->timer);
 406         spin_unlock_irqrestore(&cp->view.lock, flags);
 407 }
 408
 409 static int
 410 con3270_irq(struct con3270 *cp, struct raw3270_request *rq, struct irb *irb)
 411 {
 412         /* Handle ATTN. Schedule tasklet to read aid. */
 413         if (irb->scsw.dstat & DEV_STAT_ATTENTION)
 414                 con3270_issue_read(cp);
 415
 416         if (rq) {
 417                 if (irb->scsw.dstat & DEV_STAT_UNIT_CHECK)
 418                         rq->rc = -EIO;
 419                 else
 420                         /* Normal end. Copy residual count. */
 421                         rq->rescnt = irb->scsw.count;
 422         }
 423         return RAW3270_IO_DONE;
 424 }
 425
 426 /* Console view to a 3270 device. */
 427 static struct raw3270_fn con3270_fn = {
 428         .activate = con3270_activate,
 429         .deactivate = con3270_deactivate,
 430         .intv = (void *) con3270_irq
 431 };
 432
 433 static inline void
 434 con3270_cline_add(struct con3270 *cp)
 435 {
 436         if (!list_empty(&cp->cline->list))
 437                 /* Already added. */
 438                 return;
 439         list_add_tail(&cp->cline->list, &cp->lines);
 440         cp->nr_lines++;
 441         con3270_rebuild_update(cp);
 442 }
 443
 444 static inline void
 445 con3270_cline_insert(struct con3270 *cp, unsigned char c)
 446 {
 447         cp->cline->string[cp->cline->len++] =
 448                 cp->view.ascebc[(c < ' ') ? ' ' : c];
 449         if (list_empty(&cp->cline->update)) {
 450                 list_add_tail(&cp->cline->update, &cp->update);
 451                 cp->update_flags |= CON_UPDATE_LIST;
 452         }
 453 }
 454
 455 static inline void
 456 con3270_cline_end(struct con3270 *cp)
 457 {
 458         struct string *s;
 459         unsigned int size;
 460
 461         /* Copy cline. */
 462         size = (cp->cline->len < cp->view.cols - 5) ?
 463                 cp->cline->len + 4 : cp->view.cols;
 464         s = con3270_alloc_string(cp, size);
 465         memcpy(s->string, cp->cline->string, cp->cline->len);
 466         if (s->len < cp->view.cols - 5) {
 467                 s->string[s->len - 4] = TO_RA;
 468                 s->string[s->len - 1] = 0;
 469         } else {
 470                 while (--size > cp->cline->len)
 471                         s->string[size] = cp->view.ascebc[' '];
 472         }
 473         /* Replace cline with allocated line s and reset cline. */
 474         list_add(&s->list, &cp->cline->list);
 475         list_del_init(&cp->cline->list);
 476         if (!list_empty(&cp->cline->update)) {
 477                 list_add(&s->update, &cp->cline->update);
 478                 list_del_init(&cp->cline->update);
 479         }
 480         cp->cline->len = 0;
 481 }
 482
 483 /*
 484  * Write a string to the 3270 console
 485  */
 486 static void
 487 con3270_write(struct console *co, const char *str, unsigned int count)
 488 {
 489         struct con3270 *cp;
 490         unsigned long flags;
 491         unsigned char c;
 492
 493         cp = condev;
 494         spin_lock_irqsave(&cp->view.lock, flags);
 495         while (count-- > 0) {
 496                 c = *str++;
 497                 if (cp->cline->len == 0)
 498                         con3270_cline_add(cp);
 499                 if (c != '\n')
 500                         con3270_cline_insert(cp, c);
 501                 if (c == '\n' || cp->cline->len >= cp->view.cols)
 502                         con3270_cline_end(cp);
 503         }
 504         /* Setup timer to output current console buffer after 1/10 second */
 505         if (cp->view.dev && !timer_pending(&cp->timer))
 506                 con3270_set_timer(cp, HZ/10);
 507         spin_unlock_irqrestore(&cp->view.lock,flags);
 508 }
 509
 510 extern struct tty_driver *tty3270_driver;
 511
 512 static struct tty_driver *
 513 con3270_device(struct console *c, int *index)
 514 {
 515         *index = c->index;
 516         return tty3270_driver;
 517 }
 518
 519 /*
 520  * Wait for end of write request.
 521  */
 522 static void
 523 con3270_wait_write(struct con3270 *cp)
 524 {
 525         while (!cp->write) {
 526                 raw3270_wait_cons_dev(cp->view.dev);
 527                 barrier();
 528         }
 529 }
 530
 531 /*
 532  * panic() calls console_unblank before the system enters a
 533  * disabled, endless loop.
 534  */
 535 static void
 536 con3270_unblank(void)
 537 {
 538         struct con3270 *cp;
 539         unsigned long flags;
 540
 541         cp = condev;
 542         if (!cp->view.dev)
 543                 return;
 544         spin_lock_irqsave(&cp->view.lock, flags);
 545         con3270_wait_write(cp);
 546         cp->nr_up = 0;
 547         con3270_rebuild_update(cp);
 548         con3270_update_status(cp);
 549         while (cp->update_flags != 0) {
 550                 spin_unlock_irqrestore(&cp->view.lock, flags);
 551                 con3270_update(cp);
 552                 spin_lock_irqsave(&cp->view.lock, flags);
 553                 con3270_wait_write(cp);
 554         }
 555         spin_unlock_irqrestore(&cp->view.lock, flags);
 556 }
 557
 558 /*
 559  *  The console structure for the 3270 console
 560  */
 561 static struct console con3270 = {
 562         .name    = "tty3270",
 563         .write   = con3270_write,
 564         .device  = con3270_device,
 565         .unblank = con3270_unblank,
 566         .flags   = CON_PRINTBUFFER,
 567 };
 568
 569 /*
 570  * 3270 console initialization code called from console_init().
 571  * NOTE: This is called before kmalloc is available.
 572  */
 573 static int __init
 574 con3270_init(void)
 575 {
 576         struct ccw_device *cdev;
 577         struct raw3270 *rp;
 578         void *cbuf;
 579         int i;
 580
 581         /* Check if 3270 is to be the console */
 582         if (!CONSOLE_IS_3270)
 583                 return -ENODEV;
 584
 585         /* Set the console mode for VM */
 586         if (MACHINE_IS_VM) {
 587                 cpcmd("TERM CONMODE 3270", NULL, 0, NULL);
 588                 cpcmd("TERM AUTOCR OFF", NULL, 0, NULL);
 589         }
 590
 591         cdev = ccw_device_probe_console();
 592         if (IS_ERR(cdev))
 593                 return -ENODEV;
 594         rp = raw3270_setup_console(cdev);
 595         if (IS_ERR(rp))
 596                 return PTR_ERR(rp);
 597
 598         condev = (struct con3270 *) alloc_bootmem_low(sizeof(struct con3270));
 599         memset(condev, 0, sizeof(struct con3270));
 600         condev->view.dev = rp;
 601
 602         condev->read = raw3270_request_alloc_bootmem(0);
 603         condev->read->callback = con3270_read_callback;
 604         condev->read->callback_data = condev;
 605         condev->write =
 606                 raw3270_request_alloc_bootmem(CON3270_OUTPUT_BUFFER_SIZE);
 607         condev->kreset = raw3270_request_alloc_bootmem(1);
 608
 609         INIT_LIST_HEAD(&condev->lines);
 610         INIT_LIST_HEAD(&condev->update);
 611         init_timer(&condev->timer);
 612         tasklet_init(&condev->readlet,
 613                      (void (*)(unsigned long)) con3270_read_tasklet,
 614                      (unsigned long) condev->read);
 615
 616         raw3270_add_view(&condev->view, &con3270_fn, 1);
 617
 618         INIT_LIST_HEAD(&condev->freemem);
 619         for (i = 0; i < CON3270_STRING_PAGES; i++) {
 620                 cbuf = (void *) alloc_bootmem_low_pages(PAGE_SIZE);
 621                 add_string_memory(&condev->freemem, cbuf, PAGE_SIZE);
 622         }
 623         condev->cline = alloc_string(&condev->freemem, condev->view.cols);
 624         condev->cline->len = 0;
 625         con3270_create_status(condev);
 626         condev->input = alloc_string(&condev->freemem, 80);
 627         register_console(&con3270);
 628         return 0;
 629 }
 630
 631 console_initcall(con3270_init);