2 * drivers/s390/char/con3270.c
3 * IBM/3270 Driver - console view.
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
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>
19 #include <asm/ccwdev.h>
21 #include <asm/cpcmd.h>
22 #include <asm/ebcdic.h>
28 #define CON3270_OUTPUT_BUFFER_SIZE 1024
29 #define CON3270_STRING_PAGES 4
31 static struct raw3270_fn con3270_fn;
34 * Main 3270 console view data structure.
37 struct raw3270_view view;
39 struct list_head freemem; /* list of free memory for strings. */
42 struct list_head lines; /* list of lines. */
43 struct list_head update; /* list of lines to update. */
44 int line_nr; /* line number for next update. */
45 int nr_lines; /* # lines in list. */
46 int nr_up; /* # lines up in history. */
47 unsigned long update_flags; /* Update indication bits. */
48 struct string *cline; /* current output line. */
49 struct string *status; /* last line of display. */
50 struct raw3270_request *write; /* single write request. */
51 struct timer_list timer;
54 struct string *input; /* input string for read request. */
55 struct raw3270_request *read; /* single read request. */
56 struct raw3270_request *kreset; /* single keyboard reset request. */
57 struct tasklet_struct readlet; /* tasklet to issue read request. */
60 static struct con3270 *condev;
62 /* con3270->update_flags. See con3270_update for details. */
63 #define CON_UPDATE_ERASE 1 /* Use EWRITEA instead of WRITE. */
64 #define CON_UPDATE_LIST 2 /* Update lines in tty3270->update. */
65 #define CON_UPDATE_STATUS 4 /* Update status line. */
66 #define CON_UPDATE_ALL 7
68 static void con3270_update(struct con3270 *);
71 * Setup timeout for a device. On timeout trigger an update.
73 static void con3270_set_timer(struct con3270 *cp, int expires)
76 if (timer_pending(&cp->timer))
77 del_timer(&cp->timer);
80 if (timer_pending(&cp->timer) &&
81 mod_timer(&cp->timer, jiffies + expires))
83 cp->timer.function = (void (*)(unsigned long)) con3270_update;
84 cp->timer.data = (unsigned long) cp;
85 cp->timer.expires = jiffies + expires;
86 add_timer(&cp->timer);
90 * The status line is the last line of the screen. It shows the string
91 * "console view" in the lower left corner and "Running"/"More..."/"Holding"
92 * in the lower right corner of the screen.
95 con3270_update_status(struct con3270 *cp)
99 str = (cp->nr_up != 0) ? "History" : "Running";
100 memcpy(cp->status->string + 24, str, 7);
101 codepage_convert(cp->view.ascebc, cp->status->string + 24, 7);
102 cp->update_flags |= CON_UPDATE_STATUS;
106 con3270_create_status(struct con3270 *cp)
108 static const unsigned char blueprint[] =
109 { TO_SBA, 0, 0, TO_SF,TF_LOG,TO_SA,TAT_COLOR, TAC_GREEN,
110 'c','o','n','s','o','l','e',' ','v','i','e','w',
111 TO_RA,0,0,0,'R','u','n','n','i','n','g',TO_SF,TF_LOG };
113 cp->status = alloc_string(&cp->freemem, sizeof(blueprint));
114 /* Copy blueprint to status line */
115 memcpy(cp->status->string, blueprint, sizeof(blueprint));
116 /* Set TO_RA addresses. */
117 raw3270_buffer_address(cp->view.dev, cp->status->string + 1,
118 cp->view.cols * (cp->view.rows - 1));
119 raw3270_buffer_address(cp->view.dev, cp->status->string + 21,
120 cp->view.cols * cp->view.rows - 8);
121 /* Convert strings to ebcdic. */
122 codepage_convert(cp->view.ascebc, cp->status->string + 8, 12);
123 codepage_convert(cp->view.ascebc, cp->status->string + 24, 7);
127 * Set output offsets to 3270 datastream fragment of a console string.
130 con3270_update_string(struct con3270 *cp, struct string *s, int nr)
132 if (s->len >= cp->view.cols - 5)
134 raw3270_buffer_address(cp->view.dev, s->string + s->len - 3,
135 cp->view.cols * (nr + 1));
139 * Rebuild update list to print all lines.
142 con3270_rebuild_update(struct con3270 *cp)
144 struct string *s, *n;
148 * Throw away update list and create a new one,
149 * containing all lines that will fit on the screen.
151 list_for_each_entry_safe(s, n, &cp->update, update)
152 list_del_init(&s->update);
153 nr = cp->view.rows - 2 + cp->nr_up;
154 list_for_each_entry_reverse(s, &cp->lines, list) {
155 if (nr < cp->view.rows - 1)
156 list_add(&s->update, &cp->update);
161 cp->update_flags |= CON_UPDATE_LIST;
165 * Alloc string for size bytes. Free strings from history if necessary.
167 static struct string *
168 con3270_alloc_string(struct con3270 *cp, size_t size)
170 struct string *s, *n;
172 s = alloc_string(&cp->freemem, size);
175 list_for_each_entry_safe(s, n, &cp->lines, list) {
177 if (!list_empty(&s->update))
178 list_del(&s->update);
180 if (free_string(&cp->freemem, s) >= size)
183 s = alloc_string(&cp->freemem, size);
185 if (cp->nr_up != 0 && cp->nr_up + cp->view.rows > cp->nr_lines) {
186 cp->nr_up = cp->nr_lines - cp->view.rows + 1;
187 con3270_rebuild_update(cp);
188 con3270_update_status(cp);
194 * Write completion callback.
197 con3270_write_callback(struct raw3270_request *rq, void *data)
199 raw3270_request_reset(rq);
200 xchg(&((struct con3270 *) rq->view)->write, rq);
204 * Update console display.
207 con3270_update(struct con3270 *cp)
209 struct raw3270_request *wrq;
212 unsigned long updated;
213 struct string *s, *n;
217 raw3270_activate_view(&cp->view);
219 wrq = xchg(&cp->write, 0);
221 con3270_set_timer(cp, 1);
225 spin_lock_irqsave(&cp->view.lock, flags);
227 if (cp->update_flags & CON_UPDATE_ERASE) {
228 /* Use erase write alternate to initialize display. */
229 raw3270_request_set_cmd(wrq, TC_EWRITEA);
230 updated |= CON_UPDATE_ERASE;
232 raw3270_request_set_cmd(wrq, TC_WRITE);
235 raw3270_request_add_data(wrq, &wcc, 1);
238 * Update status line.
240 if (cp->update_flags & CON_UPDATE_STATUS)
241 if (raw3270_request_add_data(wrq, cp->status->string,
242 cp->status->len) == 0)
243 updated |= CON_UPDATE_STATUS;
245 if (cp->update_flags & CON_UPDATE_LIST) {
248 prolog[4] = TAT_COLOR;
249 prolog[5] = TAC_TURQ;
250 raw3270_buffer_address(cp->view.dev, prolog + 1,
251 cp->view.cols * cp->line_nr);
252 raw3270_request_add_data(wrq, prolog, 6);
253 /* Write strings in the update list to the screen. */
254 list_for_each_entry_safe(s, n, &cp->update, update) {
256 con3270_update_string(cp, s, cp->line_nr);
257 if (raw3270_request_add_data(wrq, s->string,
260 list_del_init(&s->update);
264 if (list_empty(&cp->update))
265 updated |= CON_UPDATE_LIST;
267 wrq->callback = con3270_write_callback;
268 rc = raw3270_start(&cp->view, wrq);
270 cp->update_flags &= ~updated;
271 if (cp->update_flags)
272 con3270_set_timer(cp, 1);
274 raw3270_request_reset(wrq);
275 xchg(&cp->write, wrq);
277 spin_unlock_irqrestore(&cp->view.lock, flags);
284 con3270_read_tasklet(struct raw3270_request *rrq)
286 static char kreset_data = TW_KR;
289 int nr_up, deactivate;
291 cp = (struct con3270 *) rrq->view;
292 spin_lock_irqsave(&cp->view.lock, flags);
295 /* Check aid byte. */
296 switch (cp->input->string[0]) {
297 case 0x7d: /* enter: jump to bottom. */
300 case 0xf3: /* PF3: deactivate the console view. */
303 case 0x6d: /* clear: start from scratch. */
304 con3270_rebuild_update(cp);
305 cp->update_flags = CON_UPDATE_ALL;
306 con3270_set_timer(cp, 1);
308 case 0xf7: /* PF7: do a page up in the console log. */
309 nr_up += cp->view.rows - 2;
310 if (nr_up + cp->view.rows - 1 > cp->nr_lines) {
311 nr_up = cp->nr_lines - cp->view.rows + 1;
316 case 0xf8: /* PF8: do a page down in the console log. */
317 nr_up -= cp->view.rows - 2;
322 if (nr_up != cp->nr_up) {
324 con3270_rebuild_update(cp);
325 con3270_update_status(cp);
326 con3270_set_timer(cp, 1);
328 spin_unlock_irqrestore(&cp->view.lock, flags);
330 /* Start keyboard reset command. */
331 raw3270_request_reset(cp->kreset);
332 raw3270_request_set_cmd(cp->kreset, TC_WRITE);
333 raw3270_request_add_data(cp->kreset, &kreset_data, 1);
334 raw3270_start(&cp->view, cp->kreset);
337 raw3270_deactivate_view(&cp->view);
339 raw3270_request_reset(rrq);
340 xchg(&cp->read, rrq);
341 raw3270_put_view(&cp->view);
345 * Read request completion callback.
348 con3270_read_callback(struct raw3270_request *rq, void *data)
350 raw3270_get_view(rq->view);
351 /* Schedule tasklet to pass input to tty. */
352 tasklet_schedule(&((struct con3270 *) rq->view)->readlet);
356 * Issue a read request. Called only from interrupt function.
359 con3270_issue_read(struct con3270 *cp)
361 struct raw3270_request *rrq;
364 rrq = xchg(&cp->read, 0);
366 /* Read already scheduled. */
368 rrq->callback = con3270_read_callback;
369 rrq->callback_data = cp;
370 raw3270_request_set_cmd(rrq, TC_READMOD);
371 raw3270_request_set_data(rrq, cp->input->string, cp->input->len);
372 /* Issue the read modified request. */
373 rc = raw3270_start_irq(&cp->view, rrq);
375 raw3270_request_reset(rrq);
379 * Switch to the console view.
382 con3270_activate(struct raw3270_view *view)
387 cp = (struct con3270 *) view;
388 spin_lock_irqsave(&cp->view.lock, flags);
390 con3270_rebuild_update(cp);
391 con3270_update_status(cp);
392 cp->update_flags = CON_UPDATE_ALL;
393 con3270_set_timer(cp, 1);
394 spin_unlock_irqrestore(&cp->view.lock, flags);
399 con3270_deactivate(struct raw3270_view *view)
404 cp = (struct con3270 *) view;
405 spin_lock_irqsave(&cp->view.lock, flags);
406 del_timer(&cp->timer);
407 spin_unlock_irqrestore(&cp->view.lock, flags);
411 con3270_irq(struct con3270 *cp, struct raw3270_request *rq, struct irb *irb)
413 /* Handle ATTN. Schedule tasklet to read aid. */
414 if (irb->scsw.dstat & DEV_STAT_ATTENTION)
415 con3270_issue_read(cp);
418 if (irb->scsw.dstat & DEV_STAT_UNIT_CHECK)
421 /* Normal end. Copy residual count. */
422 rq->rescnt = irb->scsw.count;
424 return RAW3270_IO_DONE;
427 /* Console view to a 3270 device. */
428 static struct raw3270_fn con3270_fn = {
429 .activate = con3270_activate,
430 .deactivate = con3270_deactivate,
431 .intv = (void *) con3270_irq
435 con3270_cline_add(struct con3270 *cp)
437 if (!list_empty(&cp->cline->list))
440 list_add_tail(&cp->cline->list, &cp->lines);
442 con3270_rebuild_update(cp);
446 con3270_cline_insert(struct con3270 *cp, unsigned char c)
448 cp->cline->string[cp->cline->len++] =
449 cp->view.ascebc[(c < ' ') ? ' ' : c];
450 if (list_empty(&cp->cline->update)) {
451 list_add_tail(&cp->cline->update, &cp->update);
452 cp->update_flags |= CON_UPDATE_LIST;
457 con3270_cline_end(struct con3270 *cp)
463 size = (cp->cline->len < cp->view.cols - 5) ?
464 cp->cline->len + 4 : cp->view.cols;
465 s = con3270_alloc_string(cp, size);
466 memcpy(s->string, cp->cline->string, cp->cline->len);
467 if (s->len < cp->view.cols - 5) {
468 s->string[s->len - 4] = TO_RA;
469 s->string[s->len - 1] = 0;
471 while (--size > cp->cline->len)
472 s->string[size] = cp->view.ascebc[' '];
474 /* Replace cline with allocated line s and reset cline. */
475 list_add(&s->list, &cp->cline->list);
476 list_del_init(&cp->cline->list);
477 if (!list_empty(&cp->cline->update)) {
478 list_add(&s->update, &cp->cline->update);
479 list_del_init(&cp->cline->update);
485 * Write a string to the 3270 console
488 con3270_write(struct console *co, const char *str, unsigned int count)
495 spin_lock_irqsave(&cp->view.lock, flags);
496 while (count-- > 0) {
498 if (cp->cline->len == 0)
499 con3270_cline_add(cp);
501 con3270_cline_insert(cp, c);
502 if (c == '\n' || cp->cline->len >= cp->view.cols)
503 con3270_cline_end(cp);
505 /* Setup timer to output current console buffer after 1/10 second */
506 if (cp->view.dev && !timer_pending(&cp->timer))
507 con3270_set_timer(cp, HZ/10);
508 spin_unlock_irqrestore(&cp->view.lock,flags);
511 static struct tty_driver *
512 con3270_device(struct console *c, int *index)
515 return tty3270_driver;
519 * Wait for end of write request.
522 con3270_wait_write(struct con3270 *cp)
525 raw3270_wait_cons_dev(cp->view.dev);
531 * panic() calls console_unblank before the system enters a
532 * disabled, endless loop.
535 con3270_unblank(void)
543 spin_lock_irqsave(&cp->view.lock, flags);
544 con3270_wait_write(cp);
546 con3270_rebuild_update(cp);
547 con3270_update_status(cp);
548 while (cp->update_flags != 0) {
549 spin_unlock_irqrestore(&cp->view.lock, flags);
551 spin_lock_irqsave(&cp->view.lock, flags);
552 con3270_wait_write(cp);
554 spin_unlock_irqrestore(&cp->view.lock, flags);
558 * The console structure for the 3270 console
560 static struct console con3270 = {
562 .write = con3270_write,
563 .device = con3270_device,
564 .unblank = con3270_unblank,
565 .flags = CON_PRINTBUFFER,
569 * 3270 console initialization code called from console_init().
570 * NOTE: This is called before kmalloc is available.
575 struct ccw_device *cdev;
580 /* Check if 3270 is to be the console */
581 if (!CONSOLE_IS_3270)
584 /* Set the console mode for VM */
586 cpcmd("TERM CONMODE 3270", NULL, 0, NULL);
587 cpcmd("TERM AUTOCR OFF", NULL, 0, NULL);
590 cdev = ccw_device_probe_console();
593 rp = raw3270_setup_console(cdev);
597 condev = (struct con3270 *) alloc_bootmem_low(sizeof(struct con3270));
598 memset(condev, 0, sizeof(struct con3270));
599 condev->view.dev = rp;
601 condev->read = raw3270_request_alloc_bootmem(0);
602 condev->read->callback = con3270_read_callback;
603 condev->read->callback_data = condev;
605 raw3270_request_alloc_bootmem(CON3270_OUTPUT_BUFFER_SIZE);
606 condev->kreset = raw3270_request_alloc_bootmem(1);
608 INIT_LIST_HEAD(&condev->lines);
609 INIT_LIST_HEAD(&condev->update);
610 init_timer(&condev->timer);
611 tasklet_init(&condev->readlet,
612 (void (*)(unsigned long)) con3270_read_tasklet,
613 (unsigned long) condev->read);
615 raw3270_add_view(&condev->view, &con3270_fn, 1);
617 INIT_LIST_HEAD(&condev->freemem);
618 for (i = 0; i < CON3270_STRING_PAGES; i++) {
619 cbuf = (void *) alloc_bootmem_low_pages(PAGE_SIZE);
620 add_string_memory(&condev->freemem, cbuf, PAGE_SIZE);
622 condev->cline = alloc_string(&condev->freemem, condev->view.cols);
623 condev->cline->len = 0;
624 con3270_create_status(condev);
625 condev->input = alloc_string(&condev->freemem, 80);
626 register_console(&con3270);
630 console_initcall(con3270_init);