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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /drivers/s390/char/con3270.c
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'drivers/s390/char/con3270.c')
-rw-r--r--drivers/s390/char/con3270.c638
1 files changed, 638 insertions, 0 deletions
diff --git a/drivers/s390/char/con3270.c b/drivers/s390/char/con3270.c
new file mode 100644
index 000000000000..d52fb57a6b19
--- /dev/null
+++ b/drivers/s390/char/con3270.c
@@ -0,0 +1,638 @@
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/config.h>
12#include <linux/bootmem.h>
13#include <linux/console.h>
14#include <linux/init.h>
15#include <linux/interrupt.h>
16#include <linux/list.h>
17#include <linux/types.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
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
216 wrq = xchg(&cp->write, 0);
217 if (!wrq) {
218 con3270_set_timer(cp, 1);
219 return;
220 }
221
222 spin_lock_irqsave(&cp->view.lock, flags);
223 updated = 0;
224 if (cp->update_flags & CON_UPDATE_ERASE) {
225 /* Use erase write alternate to initialize display. */
226 raw3270_request_set_cmd(wrq, TC_EWRITEA);
227 updated |= CON_UPDATE_ERASE;
228 } else
229 raw3270_request_set_cmd(wrq, TC_WRITE);
230
231 wcc = TW_NONE;
232 raw3270_request_add_data(wrq, &wcc, 1);
233
234 /*
235 * Update status line.
236 */
237 if (cp->update_flags & CON_UPDATE_STATUS)
238 if (raw3270_request_add_data(wrq, cp->status->string,
239 cp->status->len) == 0)
240 updated |= CON_UPDATE_STATUS;
241
242 if (cp->update_flags & CON_UPDATE_LIST) {
243 prolog[0] = TO_SBA;
244 prolog[3] = TO_SA;
245 prolog[4] = TAT_COLOR;
246 prolog[5] = TAC_TURQ;
247 raw3270_buffer_address(cp->view.dev, prolog + 1,
248 cp->view.cols * cp->line_nr);
249 raw3270_request_add_data(wrq, prolog, 6);
250 /* Write strings in the update list to the screen. */
251 list_for_each_entry_safe(s, n, &cp->update, update) {
252 if (s != cp->cline)
253 con3270_update_string(cp, s, cp->line_nr);
254 if (raw3270_request_add_data(wrq, s->string,
255 s->len) != 0)
256 break;
257 list_del_init(&s->update);
258 if (s != cp->cline)
259 cp->line_nr++;
260 }
261 if (list_empty(&cp->update))
262 updated |= CON_UPDATE_LIST;
263 }
264 wrq->callback = con3270_write_callback;
265 rc = raw3270_start(&cp->view, wrq);
266 if (rc == 0) {
267 cp->update_flags &= ~updated;
268 if (cp->update_flags)
269 con3270_set_timer(cp, 1);
270 } else {
271 raw3270_request_reset(wrq);
272 xchg(&cp->write, wrq);
273 }
274 spin_unlock_irqrestore(&cp->view.lock, flags);
275}
276
277/*
278 * Read tasklet.
279 */
280static void
281con3270_read_tasklet(struct raw3270_request *rrq)
282{
283 static char kreset_data = TW_KR;
284 struct con3270 *cp;
285 unsigned long flags;
286 int nr_up, deactivate;
287
288 cp = (struct con3270 *) rrq->view;
289 spin_lock_irqsave(&cp->view.lock, flags);
290 nr_up = cp->nr_up;
291 deactivate = 0;
292 /* Check aid byte. */
293 switch (cp->input->string[0]) {
294 case 0x7d: /* enter: jump to bottom. */
295 nr_up = 0;
296 break;
297 case 0xf3: /* PF3: deactivate the console view. */
298 deactivate = 1;
299 break;
300 case 0x6d: /* clear: start from scratch. */
301 con3270_rebuild_update(cp);
302 cp->update_flags = CON_UPDATE_ALL;
303 con3270_set_timer(cp, 1);
304 break;
305 case 0xf7: /* PF7: do a page up in the console log. */
306 nr_up += cp->view.rows - 2;
307 if (nr_up + cp->view.rows - 1 > cp->nr_lines) {
308 nr_up = cp->nr_lines - cp->view.rows + 1;
309 if (nr_up < 0)
310 nr_up = 0;
311 }
312 break;
313 case 0xf8: /* PF8: do a page down in the console log. */
314 nr_up -= cp->view.rows - 2;
315 if (nr_up < 0)
316 nr_up = 0;
317 break;
318 }
319 if (nr_up != cp->nr_up) {
320 cp->nr_up = nr_up;
321 con3270_rebuild_update(cp);
322 con3270_update_status(cp);
323 con3270_set_timer(cp, 1);
324 }
325 spin_unlock_irqrestore(&cp->view.lock, flags);
326
327 /* Start keyboard reset command. */
328 raw3270_request_reset(cp->kreset);
329 raw3270_request_set_cmd(cp->kreset, TC_WRITE);
330 raw3270_request_add_data(cp->kreset, &kreset_data, 1);
331 raw3270_start(&cp->view, cp->kreset);
332
333 if (deactivate)
334 raw3270_deactivate_view(&cp->view);
335
336 raw3270_request_reset(rrq);
337 xchg(&cp->read, rrq);
338 raw3270_put_view(&cp->view);
339}
340
341/*
342 * Read request completion callback.
343 */
344static void
345con3270_read_callback(struct raw3270_request *rq, void *data)
346{
347 raw3270_get_view(rq->view);
348 /* Schedule tasklet to pass input to tty. */
349 tasklet_schedule(&((struct con3270 *) rq->view)->readlet);
350}
351
352/*
353 * Issue a read request. Called only from interrupt function.
354 */
355static void
356con3270_issue_read(struct con3270 *cp)
357{
358 struct raw3270_request *rrq;
359 int rc;
360
361 rrq = xchg(&cp->read, 0);
362 if (!rrq)
363 /* Read already scheduled. */
364 return;
365 rrq->callback = con3270_read_callback;
366 rrq->callback_data = cp;
367 raw3270_request_set_cmd(rrq, TC_READMOD);
368 raw3270_request_set_data(rrq, cp->input->string, cp->input->len);
369 /* Issue the read modified request. */
370 rc = raw3270_start_irq(&cp->view, rrq);
371 if (rc)
372 raw3270_request_reset(rrq);
373}
374
375/*
376 * Switch to the console view.
377 */
378static int
379con3270_activate(struct raw3270_view *view)
380{
381 unsigned long flags;
382 struct con3270 *cp;
383
384 cp = (struct con3270 *) view;
385 spin_lock_irqsave(&cp->view.lock, flags);
386 cp->nr_up = 0;
387 con3270_rebuild_update(cp);
388 con3270_update_status(cp);
389 cp->update_flags = CON_UPDATE_ALL;
390 con3270_set_timer(cp, 1);
391 spin_unlock_irqrestore(&cp->view.lock, flags);
392 return 0;
393}
394
395static void
396con3270_deactivate(struct raw3270_view *view)
397{
398 unsigned long flags;
399 struct con3270 *cp;
400
401 cp = (struct con3270 *) view;
402 spin_lock_irqsave(&cp->view.lock, flags);
403 del_timer(&cp->timer);
404 spin_unlock_irqrestore(&cp->view.lock, flags);
405}
406
407static int
408con3270_irq(struct con3270 *cp, struct raw3270_request *rq, struct irb *irb)
409{
410 /* Handle ATTN. Schedule tasklet to read aid. */
411 if (irb->scsw.dstat & DEV_STAT_ATTENTION)
412 con3270_issue_read(cp);
413
414 if (rq) {
415 if (irb->scsw.dstat & DEV_STAT_UNIT_CHECK)
416 rq->rc = -EIO;
417 else
418 /* Normal end. Copy residual count. */
419 rq->rescnt = irb->scsw.count;
420 }
421 return RAW3270_IO_DONE;
422}
423
424/* Console view to a 3270 device. */
425static struct raw3270_fn con3270_fn = {
426 .activate = con3270_activate,
427 .deactivate = con3270_deactivate,
428 .intv = (void *) con3270_irq
429};
430
431static inline void
432con3270_cline_add(struct con3270 *cp)
433{
434 if (!list_empty(&cp->cline->list))
435 /* Already added. */
436 return;
437 list_add_tail(&cp->cline->list, &cp->lines);
438 cp->nr_lines++;
439 con3270_rebuild_update(cp);
440}
441
442static inline void
443con3270_cline_insert(struct con3270 *cp, unsigned char c)
444{
445 cp->cline->string[cp->cline->len++] =
446 cp->view.ascebc[(c < ' ') ? ' ' : c];
447 if (list_empty(&cp->cline->update)) {
448 list_add_tail(&cp->cline->update, &cp->update);
449 cp->update_flags |= CON_UPDATE_LIST;
450 }
451}
452
453static inline void
454con3270_cline_end(struct con3270 *cp)
455{
456 struct string *s;
457 unsigned int size;
458
459 /* Copy cline. */
460 size = (cp->cline->len < cp->view.cols - 5) ?
461 cp->cline->len + 4 : cp->view.cols;
462 s = con3270_alloc_string(cp, size);
463 memcpy(s->string, cp->cline->string, cp->cline->len);
464 if (s->len < cp->view.cols - 5) {
465 s->string[s->len - 4] = TO_RA;
466 s->string[s->len - 1] = 0;
467 } else {
468 while (--size > cp->cline->len)
469 s->string[size] = cp->view.ascebc[' '];
470 }
471 /* Replace cline with allocated line s and reset cline. */
472 list_add(&s->list, &cp->cline->list);
473 list_del_init(&cp->cline->list);
474 if (!list_empty(&cp->cline->update)) {
475 list_add(&s->update, &cp->cline->update);
476 list_del_init(&cp->cline->update);
477 }
478 cp->cline->len = 0;
479}
480
481/*
482 * Write a string to the 3270 console
483 */
484static void
485con3270_write(struct console *co, const char *str, unsigned int count)
486{
487 struct con3270 *cp;
488 unsigned long flags;
489 unsigned char c;
490
491 cp = condev;
492 if (cp->view.dev)
493 raw3270_activate_view(&cp->view);
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
510extern struct tty_driver *tty3270_driver;
511
512static struct tty_driver *
513con3270_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 */
522static void
523con3270_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 */
535static void
536con3270_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
558static int __init
559con3270_consetup(struct console *co, char *options)
560{
561 return 0;
562}
563
564/*
565 * The console structure for the 3270 console
566 */
567static struct console con3270 = {
568 .name = "tty3270",
569 .write = con3270_write,
570 .device = con3270_device,
571 .unblank = con3270_unblank,
572 .setup = con3270_consetup,
573 .flags = CON_PRINTBUFFER,
574};
575
576/*
577 * 3270 console initialization code called from console_init().
578 * NOTE: This is called before kmalloc is available.
579 */
580static int __init
581con3270_init(void)
582{
583 struct ccw_device *cdev;
584 struct raw3270 *rp;
585 void *cbuf;
586 int i;
587
588 /* Check if 3270 is to be the console */
589 if (!CONSOLE_IS_3270)
590 return -ENODEV;
591
592 /* Set the console mode for VM */
593 if (MACHINE_IS_VM) {
594 cpcmd("TERM CONMODE 3270", 0, 0);
595 cpcmd("TERM AUTOCR OFF", 0, 0);
596 }
597
598 cdev = ccw_device_probe_console();
599 if (!cdev)
600 return -ENODEV;
601 rp = raw3270_setup_console(cdev);
602 if (IS_ERR(rp))
603 return PTR_ERR(rp);
604
605 condev = (struct con3270 *) alloc_bootmem_low(sizeof(struct con3270));
606 memset(condev, 0, sizeof(struct con3270));
607 condev->view.dev = rp;
608
609 condev->read = raw3270_request_alloc_bootmem(0);
610 condev->read->callback = con3270_read_callback;
611 condev->read->callback_data = condev;
612 condev->write =
613 raw3270_request_alloc_bootmem(CON3270_OUTPUT_BUFFER_SIZE);
614 condev->kreset = raw3270_request_alloc_bootmem(1);
615
616 INIT_LIST_HEAD(&condev->lines);
617 INIT_LIST_HEAD(&condev->update);
618 init_timer(&condev->timer);
619 tasklet_init(&condev->readlet,
620 (void (*)(unsigned long)) con3270_read_tasklet,
621 (unsigned long) condev->read);
622
623 raw3270_add_view(&condev->view, &con3270_fn, 0);
624
625 INIT_LIST_HEAD(&condev->freemem);
626 for (i = 0; i < CON3270_STRING_PAGES; i++) {
627 cbuf = (void *) alloc_bootmem_low_pages(PAGE_SIZE);
628 add_string_memory(&condev->freemem, cbuf, PAGE_SIZE);
629 }
630 condev->cline = alloc_string(&condev->freemem, condev->view.cols);
631 condev->cline->len = 0;
632 con3270_create_status(condev);
633 condev->input = alloc_string(&condev->freemem, 80);
634 register_console(&con3270);
635 return 0;
636}
637
638console_initcall(con3270_init);