blob: 7566be8906889036aab0056d777d789b46029a19 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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
Linus Torvalds1da177e2005-04-16 15:20:36 -070011#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>
Peter Oberparleiter600b5d12006-02-01 03:06:35 -080017#include <linux/err.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070018
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
30static struct raw3270_fn con3270_fn;
31
32/*
33 * Main 3270 console view data structure.
34 */
35struct 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
59static 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
67static void con3270_update(struct con3270 *);
68
69/*
70 * Setup timeout for a device. On timeout trigger an update.
71 */
72void
73con3270_set_timer(struct con3270 *cp, int expires)
74{
75 if (expires == 0) {
76 if (timer_pending(&cp->timer))
77 del_timer(&cp->timer);
78 return;
79 }
80 if (timer_pending(&cp->timer) &&
81 mod_timer(&cp->timer, jiffies + expires))
82 return;
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);
87}
88
89/*
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.
93 */
94static void
95con3270_update_status(struct con3270 *cp)
96{
97 char *str;
98
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;
103}
104
105static void
106con3270_create_status(struct con3270 *cp)
107{
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 };
112
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);
124}
125
126/*
127 * Set output offsets to 3270 datastream fragment of a console string.
128 */
129static void
130con3270_update_string(struct con3270 *cp, struct string *s, int nr)
131{
132 if (s->len >= cp->view.cols - 5)
133 return;
134 raw3270_buffer_address(cp->view.dev, s->string + s->len - 3,
135 cp->view.cols * (nr + 1));
136}
137
138/*
139 * Rebuild update list to print all lines.
140 */
141static void
142con3270_rebuild_update(struct con3270 *cp)
143{
144 struct string *s, *n;
145 int nr;
146
147 /*
148 * Throw away update list and create a new one,
149 * containing all lines that will fit on the screen.
150 */
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);
157 if (--nr < 0)
158 break;
159 }
160 cp->line_nr = 0;
161 cp->update_flags |= CON_UPDATE_LIST;
162}
163
164/*
165 * Alloc string for size bytes. Free strings from history if necessary.
166 */
167static struct string *
168con3270_alloc_string(struct con3270 *cp, size_t size)
169{
170 struct string *s, *n;
171
172 s = alloc_string(&cp->freemem, size);
173 if (s)
174 return s;
175 list_for_each_entry_safe(s, n, &cp->lines, list) {
176 list_del(&s->list);
177 if (!list_empty(&s->update))
178 list_del(&s->update);
179 cp->nr_lines--;
180 if (free_string(&cp->freemem, s) >= size)
181 break;
182 }
183 s = alloc_string(&cp->freemem, size);
184 BUG_ON(!s);
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);
189 }
190 return s;
191}
192
193/*
194 * Write completion callback.
195 */
196static void
197con3270_write_callback(struct raw3270_request *rq, void *data)
198{
199 raw3270_request_reset(rq);
200 xchg(&((struct con3270 *) rq->view)->write, rq);
201}
202
203/*
204 * Update console display.
205 */
206static void
207con3270_update(struct con3270 *cp)
208{
209 struct raw3270_request *wrq;
210 char wcc, prolog[6];
211 unsigned long flags;
212 unsigned long updated;
213 struct string *s, *n;
214 int rc;
215
Richard Hitted3cb6f2005-10-30 15:00:10 -0800216 if (cp->view.dev)
217 raw3270_activate_view(&cp->view);
218
Linus Torvalds1da177e2005-04-16 15:20:36 -0700219 wrq = xchg(&cp->write, 0);
220 if (!wrq) {
221 con3270_set_timer(cp, 1);
222 return;
223 }
224
225 spin_lock_irqsave(&cp->view.lock, flags);
226 updated = 0;
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;
231 } else
232 raw3270_request_set_cmd(wrq, TC_WRITE);
233
234 wcc = TW_NONE;
235 raw3270_request_add_data(wrq, &wcc, 1);
236
237 /*
238 * Update status line.
239 */
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;
244
245 if (cp->update_flags & CON_UPDATE_LIST) {
246 prolog[0] = TO_SBA;
247 prolog[3] = TO_SA;
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) {
255 if (s != cp->cline)
256 con3270_update_string(cp, s, cp->line_nr);
257 if (raw3270_request_add_data(wrq, s->string,
258 s->len) != 0)
259 break;
260 list_del_init(&s->update);
261 if (s != cp->cline)
262 cp->line_nr++;
263 }
264 if (list_empty(&cp->update))
265 updated |= CON_UPDATE_LIST;
266 }
267 wrq->callback = con3270_write_callback;
268 rc = raw3270_start(&cp->view, wrq);
269 if (rc == 0) {
270 cp->update_flags &= ~updated;
271 if (cp->update_flags)
272 con3270_set_timer(cp, 1);
273 } else {
274 raw3270_request_reset(wrq);
275 xchg(&cp->write, wrq);
276 }
277 spin_unlock_irqrestore(&cp->view.lock, flags);
278}
279
280/*
281 * Read tasklet.
282 */
283static void
284con3270_read_tasklet(struct raw3270_request *rrq)
285{
286 static char kreset_data = TW_KR;
287 struct con3270 *cp;
288 unsigned long flags;
289 int nr_up, deactivate;
290
291 cp = (struct con3270 *) rrq->view;
292 spin_lock_irqsave(&cp->view.lock, flags);
293 nr_up = cp->nr_up;
294 deactivate = 0;
295 /* Check aid byte. */
296 switch (cp->input->string[0]) {
297 case 0x7d: /* enter: jump to bottom. */
298 nr_up = 0;
299 break;
300 case 0xf3: /* PF3: deactivate the console view. */
301 deactivate = 1;
302 break;
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);
307 break;
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;
312 if (nr_up < 0)
313 nr_up = 0;
314 }
315 break;
316 case 0xf8: /* PF8: do a page down in the console log. */
317 nr_up -= cp->view.rows - 2;
318 if (nr_up < 0)
319 nr_up = 0;
320 break;
321 }
322 if (nr_up != cp->nr_up) {
323 cp->nr_up = nr_up;
324 con3270_rebuild_update(cp);
325 con3270_update_status(cp);
326 con3270_set_timer(cp, 1);
327 }
328 spin_unlock_irqrestore(&cp->view.lock, flags);
329
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);
335
336 if (deactivate)
337 raw3270_deactivate_view(&cp->view);
338
339 raw3270_request_reset(rrq);
340 xchg(&cp->read, rrq);
341 raw3270_put_view(&cp->view);
342}
343
344/*
345 * Read request completion callback.
346 */
347static void
348con3270_read_callback(struct raw3270_request *rq, void *data)
349{
350 raw3270_get_view(rq->view);
351 /* Schedule tasklet to pass input to tty. */
352 tasklet_schedule(&((struct con3270 *) rq->view)->readlet);
353}
354
355/*
356 * Issue a read request. Called only from interrupt function.
357 */
358static void
359con3270_issue_read(struct con3270 *cp)
360{
361 struct raw3270_request *rrq;
362 int rc;
363
364 rrq = xchg(&cp->read, 0);
365 if (!rrq)
366 /* Read already scheduled. */
367 return;
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);
374 if (rc)
375 raw3270_request_reset(rrq);
376}
377
378/*
379 * Switch to the console view.
380 */
381static int
382con3270_activate(struct raw3270_view *view)
383{
384 unsigned long flags;
385 struct con3270 *cp;
386
387 cp = (struct con3270 *) view;
388 spin_lock_irqsave(&cp->view.lock, flags);
389 cp->nr_up = 0;
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);
395 return 0;
396}
397
398static void
399con3270_deactivate(struct raw3270_view *view)
400{
401 unsigned long flags;
402 struct con3270 *cp;
403
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);
408}
409
410static int
411con3270_irq(struct con3270 *cp, struct raw3270_request *rq, struct irb *irb)
412{
413 /* Handle ATTN. Schedule tasklet to read aid. */
414 if (irb->scsw.dstat & DEV_STAT_ATTENTION)
415 con3270_issue_read(cp);
416
417 if (rq) {
418 if (irb->scsw.dstat & DEV_STAT_UNIT_CHECK)
419 rq->rc = -EIO;
420 else
421 /* Normal end. Copy residual count. */
422 rq->rescnt = irb->scsw.count;
423 }
424 return RAW3270_IO_DONE;
425}
426
427/* Console view to a 3270 device. */
428static struct raw3270_fn con3270_fn = {
429 .activate = con3270_activate,
430 .deactivate = con3270_deactivate,
431 .intv = (void *) con3270_irq
432};
433
434static inline void
435con3270_cline_add(struct con3270 *cp)
436{
437 if (!list_empty(&cp->cline->list))
438 /* Already added. */
439 return;
440 list_add_tail(&cp->cline->list, &cp->lines);
441 cp->nr_lines++;
442 con3270_rebuild_update(cp);
443}
444
445static inline void
446con3270_cline_insert(struct con3270 *cp, unsigned char c)
447{
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;
453 }
454}
455
456static inline void
457con3270_cline_end(struct con3270 *cp)
458{
459 struct string *s;
460 unsigned int size;
461
462 /* Copy cline. */
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;
470 } else {
471 while (--size > cp->cline->len)
472 s->string[size] = cp->view.ascebc[' '];
473 }
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);
480 }
481 cp->cline->len = 0;
482}
483
484/*
485 * Write a string to the 3270 console
486 */
487static void
488con3270_write(struct console *co, const char *str, unsigned int count)
489{
490 struct con3270 *cp;
491 unsigned long flags;
492 unsigned char c;
493
494 cp = condev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700495 spin_lock_irqsave(&cp->view.lock, flags);
496 while (count-- > 0) {
497 c = *str++;
498 if (cp->cline->len == 0)
499 con3270_cline_add(cp);
500 if (c != '\n')
501 con3270_cline_insert(cp, c);
502 if (c == '\n' || cp->cline->len >= cp->view.cols)
503 con3270_cline_end(cp);
504 }
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);
509}
510
511extern struct tty_driver *tty3270_driver;
512
513static struct tty_driver *
514con3270_device(struct console *c, int *index)
515{
516 *index = c->index;
517 return tty3270_driver;
518}
519
520/*
521 * Wait for end of write request.
522 */
523static void
524con3270_wait_write(struct con3270 *cp)
525{
526 while (!cp->write) {
527 raw3270_wait_cons_dev(cp->view.dev);
528 barrier();
529 }
530}
531
532/*
533 * panic() calls console_unblank before the system enters a
534 * disabled, endless loop.
535 */
536static void
537con3270_unblank(void)
538{
539 struct con3270 *cp;
540 unsigned long flags;
541
542 cp = condev;
543 if (!cp->view.dev)
544 return;
545 spin_lock_irqsave(&cp->view.lock, flags);
546 con3270_wait_write(cp);
547 cp->nr_up = 0;
548 con3270_rebuild_update(cp);
549 con3270_update_status(cp);
550 while (cp->update_flags != 0) {
551 spin_unlock_irqrestore(&cp->view.lock, flags);
552 con3270_update(cp);
553 spin_lock_irqsave(&cp->view.lock, flags);
554 con3270_wait_write(cp);
555 }
556 spin_unlock_irqrestore(&cp->view.lock, flags);
557}
558
559static int __init
560con3270_consetup(struct console *co, char *options)
561{
562 return 0;
563}
564
565/*
566 * The console structure for the 3270 console
567 */
568static struct console con3270 = {
569 .name = "tty3270",
570 .write = con3270_write,
571 .device = con3270_device,
572 .unblank = con3270_unblank,
573 .setup = con3270_consetup,
574 .flags = CON_PRINTBUFFER,
575};
576
577/*
578 * 3270 console initialization code called from console_init().
579 * NOTE: This is called before kmalloc is available.
580 */
581static int __init
582con3270_init(void)
583{
584 struct ccw_device *cdev;
585 struct raw3270 *rp;
586 void *cbuf;
587 int i;
588
589 /* Check if 3270 is to be the console */
590 if (!CONSOLE_IS_3270)
591 return -ENODEV;
592
593 /* Set the console mode for VM */
594 if (MACHINE_IS_VM) {
Christian Borntraeger6b979de2005-06-25 14:55:32 -0700595 cpcmd("TERM CONMODE 3270", NULL, 0, NULL);
596 cpcmd("TERM AUTOCR OFF", NULL, 0, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700597 }
598
599 cdev = ccw_device_probe_console();
Peter Oberparleiter600b5d12006-02-01 03:06:35 -0800600 if (IS_ERR(cdev))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700601 return -ENODEV;
602 rp = raw3270_setup_console(cdev);
603 if (IS_ERR(rp))
604 return PTR_ERR(rp);
605
606 condev = (struct con3270 *) alloc_bootmem_low(sizeof(struct con3270));
607 memset(condev, 0, sizeof(struct con3270));
608 condev->view.dev = rp;
609
610 condev->read = raw3270_request_alloc_bootmem(0);
611 condev->read->callback = con3270_read_callback;
612 condev->read->callback_data = condev;
613 condev->write =
614 raw3270_request_alloc_bootmem(CON3270_OUTPUT_BUFFER_SIZE);
615 condev->kreset = raw3270_request_alloc_bootmem(1);
616
617 INIT_LIST_HEAD(&condev->lines);
618 INIT_LIST_HEAD(&condev->update);
619 init_timer(&condev->timer);
620 tasklet_init(&condev->readlet,
621 (void (*)(unsigned long)) con3270_read_tasklet,
622 (unsigned long) condev->read);
623
Richard Hitted3cb6f2005-10-30 15:00:10 -0800624 raw3270_add_view(&condev->view, &con3270_fn, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700625
626 INIT_LIST_HEAD(&condev->freemem);
627 for (i = 0; i < CON3270_STRING_PAGES; i++) {
628 cbuf = (void *) alloc_bootmem_low_pages(PAGE_SIZE);
629 add_string_memory(&condev->freemem, cbuf, PAGE_SIZE);
630 }
631 condev->cline = alloc_string(&condev->freemem, condev->view.cols);
632 condev->cline->len = 0;
633 con3270_create_status(condev);
634 condev->input = alloc_string(&condev->freemem, 80);
635 register_console(&con3270);
636 return 0;
637}
638
639console_initcall(con3270_init);