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>
18 #include <linux/reboot.h>
20 #include <asm/ccwdev.h>
22 #include <asm/cpcmd.h>
23 #include <asm/ebcdic.h>
29 #define CON3270_OUTPUT_BUFFER_SIZE 1024
30 #define CON3270_STRING_PAGES 4
32 static struct raw3270_fn con3270_fn;
35 * Main 3270 console view data structure.
38 struct raw3270_view view;
40 struct list_head freemem; /* list of free memory for strings. */
43 struct list_head lines; /* list of lines. */
44 struct list_head update; /* list of lines to update. */
45 int line_nr; /* line number for next update. */
46 int nr_lines; /* # lines in list. */
47 int nr_up; /* # lines up in history. */
48 unsigned long update_flags; /* Update indication bits. */
49 struct string *cline; /* current output line. */
50 struct string *status; /* last line of display. */
51 struct raw3270_request *write; /* single write request. */
52 struct timer_list timer;
55 struct string *input; /* input string for read request. */
56 struct raw3270_request *read; /* single read request. */
57 struct raw3270_request *kreset; /* single keyboard reset request. */
58 struct tasklet_struct readlet; /* tasklet to issue read request. */
61 static struct con3270 *condev;
63 /* con3270->update_flags. See con3270_update for details. */
64 #define CON_UPDATE_ERASE 1 /* Use EWRITEA instead of WRITE. */
65 #define CON_UPDATE_LIST 2 /* Update lines in tty3270->update. */
66 #define CON_UPDATE_STATUS 4 /* Update status line. */
67 #define CON_UPDATE_ALL 7
69 static void con3270_update(struct con3270 *);
72 * Setup timeout for a device. On timeout trigger an update.
74 static void con3270_set_timer(struct con3270 *cp, int expires)
77 if (timer_pending(&cp->timer))
78 del_timer(&cp->timer);
81 if (timer_pending(&cp->timer) &&
82 mod_timer(&cp->timer, jiffies + expires))
84 cp->timer.function = (void (*)(unsigned long)) con3270_update;
85 cp->timer.data = (unsigned long) cp;
86 cp->timer.expires = jiffies + expires;
87 add_timer(&cp->timer);
91 * The status line is the last line of the screen. It shows the string
92 * "console view" in the lower left corner and "Running"/"More..."/"Holding"
93 * in the lower right corner of the screen.
96 con3270_update_status(struct con3270 *cp)
100 str = (cp->nr_up != 0) ? "History" : "Running";
101 memcpy(cp->status->string + 24, str, 7);
102 codepage_convert(cp->view.ascebc, cp->status->string + 24, 7);
103 cp->update_flags |= CON_UPDATE_STATUS;
107 con3270_create_status(struct con3270 *cp)
109 static const unsigned char blueprint[] =
110 { TO_SBA, 0, 0, TO_SF,TF_LOG,TO_SA,TAT_COLOR, TAC_GREEN,
111 'c','o','n','s','o','l','e',' ','v','i','e','w',
112 TO_RA,0,0,0,'R','u','n','n','i','n','g',TO_SF,TF_LOG };
114 cp->status = alloc_string(&cp->freemem, sizeof(blueprint));
115 /* Copy blueprint to status line */
116 memcpy(cp->status->string, blueprint, sizeof(blueprint));
117 /* Set TO_RA addresses. */
118 raw3270_buffer_address(cp->view.dev, cp->status->string + 1,
119 cp->view.cols * (cp->view.rows - 1));
120 raw3270_buffer_address(cp->view.dev, cp->status->string + 21,
121 cp->view.cols * cp->view.rows - 8);
122 /* Convert strings to ebcdic. */
123 codepage_convert(cp->view.ascebc, cp->status->string + 8, 12);
124 codepage_convert(cp->view.ascebc, cp->status->string + 24, 7);
128 * Set output offsets to 3270 datastream fragment of a console string.
131 con3270_update_string(struct con3270 *cp, struct string *s, int nr)
133 if (s->len >= cp->view.cols - 5)
135 raw3270_buffer_address(cp->view.dev, s->string + s->len - 3,
136 cp->view.cols * (nr + 1));
140 * Rebuild update list to print all lines.
143 con3270_rebuild_update(struct con3270 *cp)
145 struct string *s, *n;
149 * Throw away update list and create a new one,
150 * containing all lines that will fit on the screen.
152 list_for_each_entry_safe(s, n, &cp->update, update)
153 list_del_init(&s->update);
154 nr = cp->view.rows - 2 + cp->nr_up;
155 list_for_each_entry_reverse(s, &cp->lines, list) {
156 if (nr < cp->view.rows - 1)
157 list_add(&s->update, &cp->update);
162 cp->update_flags |= CON_UPDATE_LIST;
166 * Alloc string for size bytes. Free strings from history if necessary.
168 static struct string *
169 con3270_alloc_string(struct con3270 *cp, size_t size)
171 struct string *s, *n;
173 s = alloc_string(&cp->freemem, size);
176 list_for_each_entry_safe(s, n, &cp->lines, list) {
178 if (!list_empty(&s->update))
179 list_del(&s->update);
181 if (free_string(&cp->freemem, s) >= size)
184 s = alloc_string(&cp->freemem, size);
186 if (cp->nr_up != 0 && cp->nr_up + cp->view.rows > cp->nr_lines) {
187 cp->nr_up = cp->nr_lines - cp->view.rows + 1;
188 con3270_rebuild_update(cp);
189 con3270_update_status(cp);
195 * Write completion callback.
198 con3270_write_callback(struct raw3270_request *rq, void *data)
200 raw3270_request_reset(rq);
201 xchg(&((struct con3270 *) rq->view)->write, rq);
205 * Update console display.
208 con3270_update(struct con3270 *cp)
210 struct raw3270_request *wrq;
213 unsigned long updated;
214 struct string *s, *n;
218 raw3270_activate_view(&cp->view);
220 wrq = xchg(&cp->write, 0);
222 con3270_set_timer(cp, 1);
226 spin_lock_irqsave(&cp->view.lock, flags);
228 if (cp->update_flags & CON_UPDATE_ERASE) {
229 /* Use erase write alternate to initialize display. */
230 raw3270_request_set_cmd(wrq, TC_EWRITEA);
231 updated |= CON_UPDATE_ERASE;
233 raw3270_request_set_cmd(wrq, TC_WRITE);
236 raw3270_request_add_data(wrq, &wcc, 1);
239 * Update status line.
241 if (cp->update_flags & CON_UPDATE_STATUS)
242 if (raw3270_request_add_data(wrq, cp->status->string,
243 cp->status->len) == 0)
244 updated |= CON_UPDATE_STATUS;
246 if (cp->update_flags & CON_UPDATE_LIST) {
249 prolog[4] = TAT_COLOR;
250 prolog[5] = TAC_TURQ;
251 raw3270_buffer_address(cp->view.dev, prolog + 1,
252 cp->view.cols * cp->line_nr);
253 raw3270_request_add_data(wrq, prolog, 6);
254 /* Write strings in the update list to the screen. */
255 list_for_each_entry_safe(s, n, &cp->update, update) {
257 con3270_update_string(cp, s, cp->line_nr);
258 if (raw3270_request_add_data(wrq, s->string,
261 list_del_init(&s->update);
265 if (list_empty(&cp->update))
266 updated |= CON_UPDATE_LIST;
268 wrq->callback = con3270_write_callback;
269 rc = raw3270_start(&cp->view, wrq);
271 cp->update_flags &= ~updated;
272 if (cp->update_flags)
273 con3270_set_timer(cp, 1);
275 raw3270_request_reset(wrq);
276 xchg(&cp->write, wrq);
278 spin_unlock_irqrestore(&cp->view.lock, flags);
285 con3270_read_tasklet(struct raw3270_request *rrq)
287 static char kreset_data = TW_KR;
290 int nr_up, deactivate;
292 cp = (struct con3270 *) rrq->view;
293 spin_lock_irqsave(&cp->view.lock, flags);
296 /* Check aid byte. */
297 switch (cp->input->string[0]) {
298 case 0x7d: /* enter: jump to bottom. */
301 case 0xf3: /* PF3: deactivate the console view. */
304 case 0x6d: /* clear: start from scratch. */
305 con3270_rebuild_update(cp);
306 cp->update_flags = CON_UPDATE_ALL;
307 con3270_set_timer(cp, 1);
309 case 0xf7: /* PF7: do a page up in the console log. */
310 nr_up += cp->view.rows - 2;
311 if (nr_up + cp->view.rows - 1 > cp->nr_lines) {
312 nr_up = cp->nr_lines - cp->view.rows + 1;
317 case 0xf8: /* PF8: do a page down in the console log. */
318 nr_up -= cp->view.rows - 2;
323 if (nr_up != cp->nr_up) {
325 con3270_rebuild_update(cp);
326 con3270_update_status(cp);
327 con3270_set_timer(cp, 1);
329 spin_unlock_irqrestore(&cp->view.lock, flags);
331 /* Start keyboard reset command. */
332 raw3270_request_reset(cp->kreset);
333 raw3270_request_set_cmd(cp->kreset, TC_WRITE);
334 raw3270_request_add_data(cp->kreset, &kreset_data, 1);
335 raw3270_start(&cp->view, cp->kreset);
338 raw3270_deactivate_view(&cp->view);
340 raw3270_request_reset(rrq);
341 xchg(&cp->read, rrq);
342 raw3270_put_view(&cp->view);
346 * Read request completion callback.
349 con3270_read_callback(struct raw3270_request *rq, void *data)
351 raw3270_get_view(rq->view);
352 /* Schedule tasklet to pass input to tty. */
353 tasklet_schedule(&((struct con3270 *) rq->view)->readlet);
357 * Issue a read request. Called only from interrupt function.
360 con3270_issue_read(struct con3270 *cp)
362 struct raw3270_request *rrq;
365 rrq = xchg(&cp->read, 0);
367 /* Read already scheduled. */
369 rrq->callback = con3270_read_callback;
370 rrq->callback_data = cp;
371 raw3270_request_set_cmd(rrq, TC_READMOD);
372 raw3270_request_set_data(rrq, cp->input->string, cp->input->len);
373 /* Issue the read modified request. */
374 rc = raw3270_start_irq(&cp->view, rrq);
376 raw3270_request_reset(rrq);
380 * Switch to the console view.
383 con3270_activate(struct raw3270_view *view)
388 cp = (struct con3270 *) view;
389 spin_lock_irqsave(&cp->view.lock, flags);
391 con3270_rebuild_update(cp);
392 con3270_update_status(cp);
393 cp->update_flags = CON_UPDATE_ALL;
394 con3270_set_timer(cp, 1);
395 spin_unlock_irqrestore(&cp->view.lock, flags);
400 con3270_deactivate(struct raw3270_view *view)
405 cp = (struct con3270 *) view;
406 spin_lock_irqsave(&cp->view.lock, flags);
407 del_timer(&cp->timer);
408 spin_unlock_irqrestore(&cp->view.lock, flags);
412 con3270_irq(struct con3270 *cp, struct raw3270_request *rq, struct irb *irb)
414 /* Handle ATTN. Schedule tasklet to read aid. */
415 if (irb->scsw.cmd.dstat & DEV_STAT_ATTENTION)
416 con3270_issue_read(cp);
419 if (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK)
422 /* Normal end. Copy residual count. */
423 rq->rescnt = irb->scsw.cmd.count;
425 return RAW3270_IO_DONE;
428 /* Console view to a 3270 device. */
429 static struct raw3270_fn con3270_fn = {
430 .activate = con3270_activate,
431 .deactivate = con3270_deactivate,
432 .intv = (void *) con3270_irq
436 con3270_cline_add(struct con3270 *cp)
438 if (!list_empty(&cp->cline->list))
441 list_add_tail(&cp->cline->list, &cp->lines);
443 con3270_rebuild_update(cp);
447 con3270_cline_insert(struct con3270 *cp, unsigned char c)
449 cp->cline->string[cp->cline->len++] =
450 cp->view.ascebc[(c < ' ') ? ' ' : c];
451 if (list_empty(&cp->cline->update)) {
452 list_add_tail(&cp->cline->update, &cp->update);
453 cp->update_flags |= CON_UPDATE_LIST;
458 con3270_cline_end(struct con3270 *cp)
464 size = (cp->cline->len < cp->view.cols - 5) ?
465 cp->cline->len + 4 : cp->view.cols;
466 s = con3270_alloc_string(cp, size);
467 memcpy(s->string, cp->cline->string, cp->cline->len);
468 if (s->len < cp->view.cols - 5) {
469 s->string[s->len - 4] = TO_RA;
470 s->string[s->len - 1] = 0;
472 while (--size > cp->cline->len)
473 s->string[size] = cp->view.ascebc[' '];
475 /* Replace cline with allocated line s and reset cline. */
476 list_add(&s->list, &cp->cline->list);
477 list_del_init(&cp->cline->list);
478 if (!list_empty(&cp->cline->update)) {
479 list_add(&s->update, &cp->cline->update);
480 list_del_init(&cp->cline->update);
486 * Write a string to the 3270 console
489 con3270_write(struct console *co, const char *str, unsigned int count)
496 spin_lock_irqsave(&cp->view.lock, flags);
497 while (count-- > 0) {
499 if (cp->cline->len == 0)
500 con3270_cline_add(cp);
502 con3270_cline_insert(cp, c);
503 if (c == '\n' || cp->cline->len >= cp->view.cols)
504 con3270_cline_end(cp);
506 /* Setup timer to output current console buffer after 1/10 second */
507 if (cp->view.dev && !timer_pending(&cp->timer))
508 con3270_set_timer(cp, HZ/10);
509 spin_unlock_irqrestore(&cp->view.lock,flags);
512 static struct tty_driver *
513 con3270_device(struct console *c, int *index)
516 return tty3270_driver;
520 * Wait for end of write request.
523 con3270_wait_write(struct con3270 *cp)
526 raw3270_wait_cons_dev(cp->view.dev);
532 * panic() calls con3270_flush through a panic_notifier
533 * before the system enters a disabled, endless loop.
544 spin_lock_irqsave(&cp->view.lock, flags);
545 con3270_wait_write(cp);
547 con3270_rebuild_update(cp);
548 con3270_update_status(cp);
549 while (cp->update_flags != 0) {
550 spin_unlock_irqrestore(&cp->view.lock, flags);
552 spin_lock_irqsave(&cp->view.lock, flags);
553 con3270_wait_write(cp);
555 spin_unlock_irqrestore(&cp->view.lock, flags);
558 static int con3270_notify(struct notifier_block *self,
559 unsigned long event, void *data)
565 static struct notifier_block on_panic_nb = {
566 .notifier_call = con3270_notify,
570 static struct notifier_block on_reboot_nb = {
571 .notifier_call = con3270_notify,
576 * The console structure for the 3270 console
578 static struct console con3270 = {
580 .write = con3270_write,
581 .device = con3270_device,
582 .flags = CON_PRINTBUFFER,
586 * 3270 console initialization code called from console_init().
587 * NOTE: This is called before kmalloc is available.
592 struct ccw_device *cdev;
597 /* Check if 3270 is to be the console */
598 if (!CONSOLE_IS_3270)
601 /* Set the console mode for VM */
603 cpcmd("TERM CONMODE 3270", NULL, 0, NULL);
604 cpcmd("TERM AUTOCR OFF", NULL, 0, NULL);
607 cdev = ccw_device_probe_console();
610 rp = raw3270_setup_console(cdev);
614 condev = (struct con3270 *) alloc_bootmem_low(sizeof(struct con3270));
615 memset(condev, 0, sizeof(struct con3270));
616 condev->view.dev = rp;
618 condev->read = raw3270_request_alloc_bootmem(0);
619 condev->read->callback = con3270_read_callback;
620 condev->read->callback_data = condev;
622 raw3270_request_alloc_bootmem(CON3270_OUTPUT_BUFFER_SIZE);
623 condev->kreset = raw3270_request_alloc_bootmem(1);
625 INIT_LIST_HEAD(&condev->lines);
626 INIT_LIST_HEAD(&condev->update);
627 init_timer(&condev->timer);
628 tasklet_init(&condev->readlet,
629 (void (*)(unsigned long)) con3270_read_tasklet,
630 (unsigned long) condev->read);
632 raw3270_add_view(&condev->view, &con3270_fn, 1);
634 INIT_LIST_HEAD(&condev->freemem);
635 for (i = 0; i < CON3270_STRING_PAGES; i++) {
636 cbuf = (void *) alloc_bootmem_low_pages(PAGE_SIZE);
637 add_string_memory(&condev->freemem, cbuf, PAGE_SIZE);
639 condev->cline = alloc_string(&condev->freemem, condev->view.cols);
640 condev->cline->len = 0;
641 con3270_create_status(condev);
642 condev->input = alloc_string(&condev->freemem, 80);
643 atomic_notifier_chain_register(&panic_notifier_list, &on_panic_nb);
644 register_reboot_notifier(&on_reboot_nb);
645 register_console(&con3270);
649 console_initcall(con3270_init);