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Merge tag 'pci-v3.15-changes' of git://git.kernel.org/pub/scm/linux/kernel/git/helgaa...
[deliverable/linux.git] / drivers / s390 / char / raw3270.c
1 /*
2 * IBM/3270 Driver - core functions.
3 *
4 * Author(s):
5 * Original 3270 Code for 2.4 written by Richard Hitt (UTS Global)
6 * Rewritten for 2.5 by Martin Schwidefsky <schwidefsky@de.ibm.com>
7 * Copyright IBM Corp. 2003, 2009
8 */
9
10 #include <linux/module.h>
11 #include <linux/err.h>
12 #include <linux/init.h>
13 #include <linux/interrupt.h>
14 #include <linux/list.h>
15 #include <linux/slab.h>
16 #include <linux/types.h>
17 #include <linux/wait.h>
18
19 #include <asm/ccwdev.h>
20 #include <asm/cio.h>
21 #include <asm/ebcdic.h>
22 #include <asm/diag.h>
23
24 #include "raw3270.h"
25
26 #include <linux/major.h>
27 #include <linux/kdev_t.h>
28 #include <linux/device.h>
29 #include <linux/mutex.h>
30
31 struct class *class3270;
32
33 /* The main 3270 data structure. */
34 struct raw3270 {
35 struct list_head list;
36 struct ccw_device *cdev;
37 int minor;
38
39 short model, rows, cols;
40 unsigned int state;
41 unsigned long flags;
42
43 struct list_head req_queue; /* Request queue. */
44 struct list_head view_list; /* List of available views. */
45 struct raw3270_view *view; /* Active view. */
46
47 struct timer_list timer; /* Device timer. */
48
49 unsigned char *ascebc; /* ascii -> ebcdic table */
50
51 struct raw3270_view init_view;
52 struct raw3270_request init_reset;
53 struct raw3270_request init_readpart;
54 struct raw3270_request init_readmod;
55 unsigned char init_data[256];
56 };
57
58 /* raw3270->state */
59 #define RAW3270_STATE_INIT 0 /* Initial state */
60 #define RAW3270_STATE_RESET 1 /* Reset command is pending */
61 #define RAW3270_STATE_W4ATTN 2 /* Wait for attention interrupt */
62 #define RAW3270_STATE_READMOD 3 /* Read partition is pending */
63 #define RAW3270_STATE_READY 4 /* Device is usable by views */
64
65 /* raw3270->flags */
66 #define RAW3270_FLAGS_14BITADDR 0 /* 14-bit buffer addresses */
67 #define RAW3270_FLAGS_BUSY 1 /* Device busy, leave it alone */
68 #define RAW3270_FLAGS_CONSOLE 2 /* Device is the console. */
69 #define RAW3270_FLAGS_FROZEN 3 /* set if 3270 is frozen for suspend */
70
71 /* Semaphore to protect global data of raw3270 (devices, views, etc). */
72 static DEFINE_MUTEX(raw3270_mutex);
73
74 /* List of 3270 devices. */
75 static LIST_HEAD(raw3270_devices);
76
77 /*
78 * Flag to indicate if the driver has been registered. Some operations
79 * like waiting for the end of i/o need to be done differently as long
80 * as the kernel is still starting up (console support).
81 */
82 static int raw3270_registered;
83
84 /* Module parameters */
85 static bool tubxcorrect = 0;
86 module_param(tubxcorrect, bool, 0);
87
88 /*
89 * Wait queue for device init/delete, view delete.
90 */
91 DECLARE_WAIT_QUEUE_HEAD(raw3270_wait_queue);
92
93 /*
94 * Encode array for 12 bit 3270 addresses.
95 */
96 static unsigned char raw3270_ebcgraf[64] = {
97 0x40, 0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7,
98 0xc8, 0xc9, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f,
99 0x50, 0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7,
100 0xd8, 0xd9, 0x5a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f,
101 0x60, 0x61, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7,
102 0xe8, 0xe9, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f,
103 0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7,
104 0xf8, 0xf9, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f
105 };
106
107 static inline int raw3270_state_ready(struct raw3270 *rp)
108 {
109 return rp->state == RAW3270_STATE_READY;
110 }
111
112 static inline int raw3270_state_final(struct raw3270 *rp)
113 {
114 return rp->state == RAW3270_STATE_INIT ||
115 rp->state == RAW3270_STATE_READY;
116 }
117
118 void
119 raw3270_buffer_address(struct raw3270 *rp, char *cp, unsigned short addr)
120 {
121 if (test_bit(RAW3270_FLAGS_14BITADDR, &rp->flags)) {
122 cp[0] = (addr >> 8) & 0x3f;
123 cp[1] = addr & 0xff;
124 } else {
125 cp[0] = raw3270_ebcgraf[(addr >> 6) & 0x3f];
126 cp[1] = raw3270_ebcgraf[addr & 0x3f];
127 }
128 }
129
130 /*
131 * Allocate a new 3270 ccw request
132 */
133 struct raw3270_request *
134 raw3270_request_alloc(size_t size)
135 {
136 struct raw3270_request *rq;
137
138 /* Allocate request structure */
139 rq = kzalloc(sizeof(struct raw3270_request), GFP_KERNEL | GFP_DMA);
140 if (!rq)
141 return ERR_PTR(-ENOMEM);
142
143 /* alloc output buffer. */
144 if (size > 0) {
145 rq->buffer = kmalloc(size, GFP_KERNEL | GFP_DMA);
146 if (!rq->buffer) {
147 kfree(rq);
148 return ERR_PTR(-ENOMEM);
149 }
150 }
151 rq->size = size;
152 INIT_LIST_HEAD(&rq->list);
153
154 /*
155 * Setup ccw.
156 */
157 rq->ccw.cda = __pa(rq->buffer);
158 rq->ccw.flags = CCW_FLAG_SLI;
159
160 return rq;
161 }
162
163 /*
164 * Free 3270 ccw request
165 */
166 void
167 raw3270_request_free (struct raw3270_request *rq)
168 {
169 kfree(rq->buffer);
170 kfree(rq);
171 }
172
173 /*
174 * Reset request to initial state.
175 */
176 void
177 raw3270_request_reset(struct raw3270_request *rq)
178 {
179 BUG_ON(!list_empty(&rq->list));
180 rq->ccw.cmd_code = 0;
181 rq->ccw.count = 0;
182 rq->ccw.cda = __pa(rq->buffer);
183 rq->ccw.flags = CCW_FLAG_SLI;
184 rq->rescnt = 0;
185 rq->rc = 0;
186 }
187
188 /*
189 * Set command code to ccw of a request.
190 */
191 void
192 raw3270_request_set_cmd(struct raw3270_request *rq, u8 cmd)
193 {
194 rq->ccw.cmd_code = cmd;
195 }
196
197 /*
198 * Add data fragment to output buffer.
199 */
200 int
201 raw3270_request_add_data(struct raw3270_request *rq, void *data, size_t size)
202 {
203 if (size + rq->ccw.count > rq->size)
204 return -E2BIG;
205 memcpy(rq->buffer + rq->ccw.count, data, size);
206 rq->ccw.count += size;
207 return 0;
208 }
209
210 /*
211 * Set address/length pair to ccw of a request.
212 */
213 void
214 raw3270_request_set_data(struct raw3270_request *rq, void *data, size_t size)
215 {
216 rq->ccw.cda = __pa(data);
217 rq->ccw.count = size;
218 }
219
220 /*
221 * Set idal buffer to ccw of a request.
222 */
223 void
224 raw3270_request_set_idal(struct raw3270_request *rq, struct idal_buffer *ib)
225 {
226 rq->ccw.cda = __pa(ib->data);
227 rq->ccw.count = ib->size;
228 rq->ccw.flags |= CCW_FLAG_IDA;
229 }
230
231 /*
232 * Stop running ccw.
233 */
234 static int
235 __raw3270_halt_io(struct raw3270 *rp, struct raw3270_request *rq)
236 {
237 int retries;
238 int rc;
239
240 if (raw3270_request_final(rq))
241 return 0;
242 /* Check if interrupt has already been processed */
243 for (retries = 0; retries < 5; retries++) {
244 if (retries < 2)
245 rc = ccw_device_halt(rp->cdev, (long) rq);
246 else
247 rc = ccw_device_clear(rp->cdev, (long) rq);
248 if (rc == 0)
249 break; /* termination successful */
250 }
251 return rc;
252 }
253
254 /*
255 * Add the request to the request queue, try to start it if the
256 * 3270 device is idle. Return without waiting for end of i/o.
257 */
258 static int
259 __raw3270_start(struct raw3270 *rp, struct raw3270_view *view,
260 struct raw3270_request *rq)
261 {
262 rq->view = view;
263 raw3270_get_view(view);
264 if (list_empty(&rp->req_queue) &&
265 !test_bit(RAW3270_FLAGS_BUSY, &rp->flags)) {
266 /* No other requests are on the queue. Start this one. */
267 rq->rc = ccw_device_start(rp->cdev, &rq->ccw,
268 (unsigned long) rq, 0, 0);
269 if (rq->rc) {
270 raw3270_put_view(view);
271 return rq->rc;
272 }
273 }
274 list_add_tail(&rq->list, &rp->req_queue);
275 return 0;
276 }
277
278 int
279 raw3270_view_active(struct raw3270_view *view)
280 {
281 struct raw3270 *rp = view->dev;
282
283 return rp && rp->view == view &&
284 !test_bit(RAW3270_FLAGS_FROZEN, &rp->flags);
285 }
286
287 int
288 raw3270_start(struct raw3270_view *view, struct raw3270_request *rq)
289 {
290 unsigned long flags;
291 struct raw3270 *rp;
292 int rc;
293
294 spin_lock_irqsave(get_ccwdev_lock(view->dev->cdev), flags);
295 rp = view->dev;
296 if (!rp || rp->view != view ||
297 test_bit(RAW3270_FLAGS_FROZEN, &rp->flags))
298 rc = -EACCES;
299 else if (!raw3270_state_ready(rp))
300 rc = -EBUSY;
301 else
302 rc = __raw3270_start(rp, view, rq);
303 spin_unlock_irqrestore(get_ccwdev_lock(view->dev->cdev), flags);
304 return rc;
305 }
306
307 int
308 raw3270_start_locked(struct raw3270_view *view, struct raw3270_request *rq)
309 {
310 struct raw3270 *rp;
311 int rc;
312
313 rp = view->dev;
314 if (!rp || rp->view != view ||
315 test_bit(RAW3270_FLAGS_FROZEN, &rp->flags))
316 rc = -EACCES;
317 else if (!raw3270_state_ready(rp))
318 rc = -EBUSY;
319 else
320 rc = __raw3270_start(rp, view, rq);
321 return rc;
322 }
323
324 int
325 raw3270_start_irq(struct raw3270_view *view, struct raw3270_request *rq)
326 {
327 struct raw3270 *rp;
328
329 rp = view->dev;
330 rq->view = view;
331 raw3270_get_view(view);
332 list_add_tail(&rq->list, &rp->req_queue);
333 return 0;
334 }
335
336 /*
337 * 3270 interrupt routine, called from the ccw_device layer
338 */
339 static void
340 raw3270_irq (struct ccw_device *cdev, unsigned long intparm, struct irb *irb)
341 {
342 struct raw3270 *rp;
343 struct raw3270_view *view;
344 struct raw3270_request *rq;
345 int rc;
346
347 rp = dev_get_drvdata(&cdev->dev);
348 if (!rp)
349 return;
350 rq = (struct raw3270_request *) intparm;
351 view = rq ? rq->view : rp->view;
352
353 if (IS_ERR(irb))
354 rc = RAW3270_IO_RETRY;
355 else if (irb->scsw.cmd.fctl & SCSW_FCTL_HALT_FUNC) {
356 rq->rc = -EIO;
357 rc = RAW3270_IO_DONE;
358 } else if (irb->scsw.cmd.dstat == (DEV_STAT_CHN_END | DEV_STAT_DEV_END |
359 DEV_STAT_UNIT_EXCEP)) {
360 /* Handle CE-DE-UE and subsequent UDE */
361 set_bit(RAW3270_FLAGS_BUSY, &rp->flags);
362 rc = RAW3270_IO_BUSY;
363 } else if (test_bit(RAW3270_FLAGS_BUSY, &rp->flags)) {
364 /* Wait for UDE if busy flag is set. */
365 if (irb->scsw.cmd.dstat & DEV_STAT_DEV_END) {
366 clear_bit(RAW3270_FLAGS_BUSY, &rp->flags);
367 /* Got it, now retry. */
368 rc = RAW3270_IO_RETRY;
369 } else
370 rc = RAW3270_IO_BUSY;
371 } else if (view)
372 rc = view->fn->intv(view, rq, irb);
373 else
374 rc = RAW3270_IO_DONE;
375
376 switch (rc) {
377 case RAW3270_IO_DONE:
378 break;
379 case RAW3270_IO_BUSY:
380 /*
381 * Intervention required by the operator. We have to wait
382 * for unsolicited device end.
383 */
384 return;
385 case RAW3270_IO_RETRY:
386 if (!rq)
387 break;
388 rq->rc = ccw_device_start(rp->cdev, &rq->ccw,
389 (unsigned long) rq, 0, 0);
390 if (rq->rc == 0)
391 return; /* Successfully restarted. */
392 break;
393 case RAW3270_IO_STOP:
394 if (!rq)
395 break;
396 __raw3270_halt_io(rp, rq);
397 rq->rc = -EIO;
398 break;
399 default:
400 BUG();
401 }
402 if (rq) {
403 BUG_ON(list_empty(&rq->list));
404 /* The request completed, remove from queue and do callback. */
405 list_del_init(&rq->list);
406 if (rq->callback)
407 rq->callback(rq, rq->callback_data);
408 /* Do put_device for get_device in raw3270_start. */
409 raw3270_put_view(view);
410 }
411 /*
412 * Try to start each request on request queue until one is
413 * started successful.
414 */
415 while (!list_empty(&rp->req_queue)) {
416 rq = list_entry(rp->req_queue.next,struct raw3270_request,list);
417 rq->rc = ccw_device_start(rp->cdev, &rq->ccw,
418 (unsigned long) rq, 0, 0);
419 if (rq->rc == 0)
420 break;
421 /* Start failed. Remove request and do callback. */
422 list_del_init(&rq->list);
423 if (rq->callback)
424 rq->callback(rq, rq->callback_data);
425 /* Do put_device for get_device in raw3270_start. */
426 raw3270_put_view(view);
427 }
428 }
429
430 /*
431 * To determine the size of the 3270 device we need to do:
432 * 1) send a 'read partition' data stream to the device
433 * 2) wait for the attn interrupt that precedes the query reply
434 * 3) do a read modified to get the query reply
435 * To make things worse we have to cope with intervention
436 * required (3270 device switched to 'stand-by') and command
437 * rejects (old devices that can't do 'read partition').
438 */
439 struct raw3270_ua { /* Query Reply structure for Usable Area */
440 struct { /* Usable Area Query Reply Base */
441 short l; /* Length of this structured field */
442 char sfid; /* 0x81 if Query Reply */
443 char qcode; /* 0x81 if Usable Area */
444 char flags0;
445 char flags1;
446 short w; /* Width of usable area */
447 short h; /* Heigth of usavle area */
448 char units; /* 0x00:in; 0x01:mm */
449 int xr;
450 int yr;
451 char aw;
452 char ah;
453 short buffsz; /* Character buffer size, bytes */
454 char xmin;
455 char ymin;
456 char xmax;
457 char ymax;
458 } __attribute__ ((packed)) uab;
459 struct { /* Alternate Usable Area Self-Defining Parameter */
460 char l; /* Length of this Self-Defining Parm */
461 char sdpid; /* 0x02 if Alternate Usable Area */
462 char res;
463 char auaid; /* 0x01 is Id for the A U A */
464 short wauai; /* Width of AUAi */
465 short hauai; /* Height of AUAi */
466 char auaunits; /* 0x00:in, 0x01:mm */
467 int auaxr;
468 int auayr;
469 char awauai;
470 char ahauai;
471 } __attribute__ ((packed)) aua;
472 } __attribute__ ((packed));
473
474 static void
475 raw3270_size_device_vm(struct raw3270 *rp)
476 {
477 int rc, model;
478 struct ccw_dev_id dev_id;
479 struct diag210 diag_data;
480
481 ccw_device_get_id(rp->cdev, &dev_id);
482 diag_data.vrdcdvno = dev_id.devno;
483 diag_data.vrdclen = sizeof(struct diag210);
484 rc = diag210(&diag_data);
485 model = diag_data.vrdccrmd;
486 /* Use default model 2 if the size could not be detected */
487 if (rc || model < 2 || model > 5)
488 model = 2;
489 switch (model) {
490 case 2:
491 rp->model = model;
492 rp->rows = 24;
493 rp->cols = 80;
494 break;
495 case 3:
496 rp->model = model;
497 rp->rows = 32;
498 rp->cols = 80;
499 break;
500 case 4:
501 rp->model = model;
502 rp->rows = 43;
503 rp->cols = 80;
504 break;
505 case 5:
506 rp->model = model;
507 rp->rows = 27;
508 rp->cols = 132;
509 break;
510 }
511 }
512
513 static void
514 raw3270_size_device(struct raw3270 *rp)
515 {
516 struct raw3270_ua *uap;
517
518 /* Got a Query Reply */
519 uap = (struct raw3270_ua *) (rp->init_data + 1);
520 /* Paranoia check. */
521 if (rp->init_readmod.rc || rp->init_data[0] != 0x88 ||
522 uap->uab.qcode != 0x81) {
523 /* Couldn't detect size. Use default model 2. */
524 rp->model = 2;
525 rp->rows = 24;
526 rp->cols = 80;
527 return;
528 }
529 /* Copy rows/columns of default Usable Area */
530 rp->rows = uap->uab.h;
531 rp->cols = uap->uab.w;
532 /* Check for 14 bit addressing */
533 if ((uap->uab.flags0 & 0x0d) == 0x01)
534 set_bit(RAW3270_FLAGS_14BITADDR, &rp->flags);
535 /* Check for Alternate Usable Area */
536 if (uap->uab.l == sizeof(struct raw3270_ua) &&
537 uap->aua.sdpid == 0x02) {
538 rp->rows = uap->aua.hauai;
539 rp->cols = uap->aua.wauai;
540 }
541 /* Try to find a model. */
542 rp->model = 0;
543 if (rp->rows == 24 && rp->cols == 80)
544 rp->model = 2;
545 if (rp->rows == 32 && rp->cols == 80)
546 rp->model = 3;
547 if (rp->rows == 43 && rp->cols == 80)
548 rp->model = 4;
549 if (rp->rows == 27 && rp->cols == 132)
550 rp->model = 5;
551 }
552
553 static void
554 raw3270_size_device_done(struct raw3270 *rp)
555 {
556 struct raw3270_view *view;
557
558 rp->view = NULL;
559 rp->state = RAW3270_STATE_READY;
560 /* Notify views about new size */
561 list_for_each_entry(view, &rp->view_list, list)
562 if (view->fn->resize)
563 view->fn->resize(view, rp->model, rp->rows, rp->cols);
564 /* Setup processing done, now activate a view */
565 list_for_each_entry(view, &rp->view_list, list) {
566 rp->view = view;
567 if (view->fn->activate(view) == 0)
568 break;
569 rp->view = NULL;
570 }
571 }
572
573 static void
574 raw3270_read_modified_cb(struct raw3270_request *rq, void *data)
575 {
576 struct raw3270 *rp = rq->view->dev;
577
578 raw3270_size_device(rp);
579 raw3270_size_device_done(rp);
580 }
581
582 static void
583 raw3270_read_modified(struct raw3270 *rp)
584 {
585 if (rp->state != RAW3270_STATE_W4ATTN)
586 return;
587 /* Use 'read modified' to get the result of a read partition. */
588 memset(&rp->init_readmod, 0, sizeof(rp->init_readmod));
589 memset(&rp->init_data, 0, sizeof(rp->init_data));
590 rp->init_readmod.ccw.cmd_code = TC_READMOD;
591 rp->init_readmod.ccw.flags = CCW_FLAG_SLI;
592 rp->init_readmod.ccw.count = sizeof(rp->init_data);
593 rp->init_readmod.ccw.cda = (__u32) __pa(rp->init_data);
594 rp->init_readmod.callback = raw3270_read_modified_cb;
595 rp->state = RAW3270_STATE_READMOD;
596 raw3270_start_irq(&rp->init_view, &rp->init_readmod);
597 }
598
599 static void
600 raw3270_writesf_readpart(struct raw3270 *rp)
601 {
602 static const unsigned char wbuf[] =
603 { 0x00, 0x07, 0x01, 0xff, 0x03, 0x00, 0x81 };
604
605 /* Store 'read partition' data stream to init_data */
606 memset(&rp->init_readpart, 0, sizeof(rp->init_readpart));
607 memset(&rp->init_data, 0, sizeof(rp->init_data));
608 memcpy(&rp->init_data, wbuf, sizeof(wbuf));
609 rp->init_readpart.ccw.cmd_code = TC_WRITESF;
610 rp->init_readpart.ccw.flags = CCW_FLAG_SLI;
611 rp->init_readpart.ccw.count = sizeof(wbuf);
612 rp->init_readpart.ccw.cda = (__u32) __pa(&rp->init_data);
613 rp->state = RAW3270_STATE_W4ATTN;
614 raw3270_start_irq(&rp->init_view, &rp->init_readpart);
615 }
616
617 /*
618 * Device reset
619 */
620 static void
621 raw3270_reset_device_cb(struct raw3270_request *rq, void *data)
622 {
623 struct raw3270 *rp = rq->view->dev;
624
625 if (rp->state != RAW3270_STATE_RESET)
626 return;
627 if (rq->rc) {
628 /* Reset command failed. */
629 rp->state = RAW3270_STATE_INIT;
630 } else if (MACHINE_IS_VM) {
631 raw3270_size_device_vm(rp);
632 raw3270_size_device_done(rp);
633 } else
634 raw3270_writesf_readpart(rp);
635 }
636
637 static int
638 __raw3270_reset_device(struct raw3270 *rp)
639 {
640 int rc;
641
642 /* Store reset data stream to init_data/init_reset */
643 memset(&rp->init_reset, 0, sizeof(rp->init_reset));
644 memset(&rp->init_data, 0, sizeof(rp->init_data));
645 rp->init_data[0] = TW_KR;
646 rp->init_reset.ccw.cmd_code = TC_EWRITEA;
647 rp->init_reset.ccw.flags = CCW_FLAG_SLI;
648 rp->init_reset.ccw.count = 1;
649 rp->init_reset.ccw.cda = (__u32) __pa(rp->init_data);
650 rp->init_reset.callback = raw3270_reset_device_cb;
651 rc = __raw3270_start(rp, &rp->init_view, &rp->init_reset);
652 if (rc == 0 && rp->state == RAW3270_STATE_INIT)
653 rp->state = RAW3270_STATE_RESET;
654 return rc;
655 }
656
657 static int
658 raw3270_reset_device(struct raw3270 *rp)
659 {
660 unsigned long flags;
661 int rc;
662
663 spin_lock_irqsave(get_ccwdev_lock(rp->cdev), flags);
664 rc = __raw3270_reset_device(rp);
665 spin_unlock_irqrestore(get_ccwdev_lock(rp->cdev), flags);
666 return rc;
667 }
668
669 int
670 raw3270_reset(struct raw3270_view *view)
671 {
672 struct raw3270 *rp;
673 int rc;
674
675 rp = view->dev;
676 if (!rp || rp->view != view ||
677 test_bit(RAW3270_FLAGS_FROZEN, &rp->flags))
678 rc = -EACCES;
679 else if (!raw3270_state_ready(rp))
680 rc = -EBUSY;
681 else
682 rc = raw3270_reset_device(view->dev);
683 return rc;
684 }
685
686 static int
687 raw3270_init_irq(struct raw3270_view *view, struct raw3270_request *rq,
688 struct irb *irb)
689 {
690 struct raw3270 *rp;
691
692 /*
693 * Unit-Check Processing:
694 * Expect Command Reject or Intervention Required.
695 */
696 if (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK) {
697 /* Request finished abnormally. */
698 if (irb->ecw[0] & SNS0_INTERVENTION_REQ) {
699 set_bit(RAW3270_FLAGS_BUSY, &view->dev->flags);
700 return RAW3270_IO_BUSY;
701 }
702 }
703 if (rq) {
704 if (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK) {
705 if (irb->ecw[0] & SNS0_CMD_REJECT)
706 rq->rc = -EOPNOTSUPP;
707 else
708 rq->rc = -EIO;
709 }
710 }
711 if (irb->scsw.cmd.dstat & DEV_STAT_ATTENTION) {
712 /* Queue read modified after attention interrupt */
713 rp = view->dev;
714 raw3270_read_modified(rp);
715 }
716 return RAW3270_IO_DONE;
717 }
718
719 static struct raw3270_fn raw3270_init_fn = {
720 .intv = raw3270_init_irq
721 };
722
723 /*
724 * Setup new 3270 device.
725 */
726 static int
727 raw3270_setup_device(struct ccw_device *cdev, struct raw3270 *rp, char *ascebc)
728 {
729 struct list_head *l;
730 struct raw3270 *tmp;
731 int minor;
732
733 memset(rp, 0, sizeof(struct raw3270));
734 /* Copy ebcdic -> ascii translation table. */
735 memcpy(ascebc, _ascebc, 256);
736 if (tubxcorrect) {
737 /* correct brackets and circumflex */
738 ascebc['['] = 0xad;
739 ascebc[']'] = 0xbd;
740 ascebc['^'] = 0xb0;
741 }
742 rp->ascebc = ascebc;
743
744 /* Set defaults. */
745 rp->rows = 24;
746 rp->cols = 80;
747
748 INIT_LIST_HEAD(&rp->req_queue);
749 INIT_LIST_HEAD(&rp->view_list);
750
751 rp->init_view.dev = rp;
752 rp->init_view.fn = &raw3270_init_fn;
753 rp->view = &rp->init_view;
754
755 /*
756 * Add device to list and find the smallest unused minor
757 * number for it. Note: there is no device with minor 0,
758 * see special case for fs3270.c:fs3270_open().
759 */
760 mutex_lock(&raw3270_mutex);
761 /* Keep the list sorted. */
762 minor = RAW3270_FIRSTMINOR;
763 rp->minor = -1;
764 list_for_each(l, &raw3270_devices) {
765 tmp = list_entry(l, struct raw3270, list);
766 if (tmp->minor > minor) {
767 rp->minor = minor;
768 __list_add(&rp->list, l->prev, l);
769 break;
770 }
771 minor++;
772 }
773 if (rp->minor == -1 && minor < RAW3270_MAXDEVS + RAW3270_FIRSTMINOR) {
774 rp->minor = minor;
775 list_add_tail(&rp->list, &raw3270_devices);
776 }
777 mutex_unlock(&raw3270_mutex);
778 /* No free minor number? Then give up. */
779 if (rp->minor == -1)
780 return -EUSERS;
781 rp->cdev = cdev;
782 dev_set_drvdata(&cdev->dev, rp);
783 cdev->handler = raw3270_irq;
784 return 0;
785 }
786
787 #ifdef CONFIG_TN3270_CONSOLE
788 /* Tentative definition - see below for actual definition. */
789 static struct ccw_driver raw3270_ccw_driver;
790
791 /*
792 * Setup 3270 device configured as console.
793 */
794 struct raw3270 __init *raw3270_setup_console(void)
795 {
796 struct ccw_device *cdev;
797 unsigned long flags;
798 struct raw3270 *rp;
799 char *ascebc;
800 int rc;
801
802 cdev = ccw_device_create_console(&raw3270_ccw_driver);
803 if (IS_ERR(cdev))
804 return ERR_CAST(cdev);
805
806 rp = kzalloc(sizeof(struct raw3270), GFP_KERNEL | GFP_DMA);
807 ascebc = kzalloc(256, GFP_KERNEL);
808 rc = raw3270_setup_device(cdev, rp, ascebc);
809 if (rc)
810 return ERR_PTR(rc);
811 set_bit(RAW3270_FLAGS_CONSOLE, &rp->flags);
812
813 rc = ccw_device_enable_console(cdev);
814 if (rc) {
815 ccw_device_destroy_console(cdev);
816 return ERR_PTR(rc);
817 }
818
819 spin_lock_irqsave(get_ccwdev_lock(rp->cdev), flags);
820 do {
821 __raw3270_reset_device(rp);
822 while (!raw3270_state_final(rp)) {
823 ccw_device_wait_idle(rp->cdev);
824 barrier();
825 }
826 } while (rp->state != RAW3270_STATE_READY);
827 spin_unlock_irqrestore(get_ccwdev_lock(rp->cdev), flags);
828 return rp;
829 }
830
831 void
832 raw3270_wait_cons_dev(struct raw3270 *rp)
833 {
834 unsigned long flags;
835
836 spin_lock_irqsave(get_ccwdev_lock(rp->cdev), flags);
837 ccw_device_wait_idle(rp->cdev);
838 spin_unlock_irqrestore(get_ccwdev_lock(rp->cdev), flags);
839 }
840
841 #endif
842
843 /*
844 * Create a 3270 device structure.
845 */
846 static struct raw3270 *
847 raw3270_create_device(struct ccw_device *cdev)
848 {
849 struct raw3270 *rp;
850 char *ascebc;
851 int rc;
852
853 rp = kmalloc(sizeof(struct raw3270), GFP_KERNEL | GFP_DMA);
854 if (!rp)
855 return ERR_PTR(-ENOMEM);
856 ascebc = kmalloc(256, GFP_KERNEL);
857 if (!ascebc) {
858 kfree(rp);
859 return ERR_PTR(-ENOMEM);
860 }
861 rc = raw3270_setup_device(cdev, rp, ascebc);
862 if (rc) {
863 kfree(rp->ascebc);
864 kfree(rp);
865 rp = ERR_PTR(rc);
866 }
867 /* Get reference to ccw_device structure. */
868 get_device(&cdev->dev);
869 return rp;
870 }
871
872 /*
873 * Activate a view.
874 */
875 int
876 raw3270_activate_view(struct raw3270_view *view)
877 {
878 struct raw3270 *rp;
879 struct raw3270_view *oldview, *nv;
880 unsigned long flags;
881 int rc;
882
883 rp = view->dev;
884 if (!rp)
885 return -ENODEV;
886 spin_lock_irqsave(get_ccwdev_lock(rp->cdev), flags);
887 if (rp->view == view)
888 rc = 0;
889 else if (!raw3270_state_ready(rp))
890 rc = -EBUSY;
891 else if (test_bit(RAW3270_FLAGS_FROZEN, &rp->flags))
892 rc = -EACCES;
893 else {
894 oldview = NULL;
895 if (rp->view && rp->view->fn->deactivate) {
896 oldview = rp->view;
897 oldview->fn->deactivate(oldview);
898 }
899 rp->view = view;
900 rc = view->fn->activate(view);
901 if (rc) {
902 /* Didn't work. Try to reactivate the old view. */
903 rp->view = oldview;
904 if (!oldview || oldview->fn->activate(oldview) != 0) {
905 /* Didn't work as well. Try any other view. */
906 list_for_each_entry(nv, &rp->view_list, list)
907 if (nv != view && nv != oldview) {
908 rp->view = nv;
909 if (nv->fn->activate(nv) == 0)
910 break;
911 rp->view = NULL;
912 }
913 }
914 }
915 }
916 spin_unlock_irqrestore(get_ccwdev_lock(rp->cdev), flags);
917 return rc;
918 }
919
920 /*
921 * Deactivate current view.
922 */
923 void
924 raw3270_deactivate_view(struct raw3270_view *view)
925 {
926 unsigned long flags;
927 struct raw3270 *rp;
928
929 rp = view->dev;
930 if (!rp)
931 return;
932 spin_lock_irqsave(get_ccwdev_lock(rp->cdev), flags);
933 if (rp->view == view) {
934 view->fn->deactivate(view);
935 rp->view = NULL;
936 /* Move deactivated view to end of list. */
937 list_del_init(&view->list);
938 list_add_tail(&view->list, &rp->view_list);
939 /* Try to activate another view. */
940 if (raw3270_state_ready(rp) &&
941 !test_bit(RAW3270_FLAGS_FROZEN, &rp->flags)) {
942 list_for_each_entry(view, &rp->view_list, list) {
943 rp->view = view;
944 if (view->fn->activate(view) == 0)
945 break;
946 rp->view = NULL;
947 }
948 }
949 }
950 spin_unlock_irqrestore(get_ccwdev_lock(rp->cdev), flags);
951 }
952
953 /*
954 * Add view to device with minor "minor".
955 */
956 int
957 raw3270_add_view(struct raw3270_view *view, struct raw3270_fn *fn, int minor)
958 {
959 unsigned long flags;
960 struct raw3270 *rp;
961 int rc;
962
963 if (minor <= 0)
964 return -ENODEV;
965 mutex_lock(&raw3270_mutex);
966 rc = -ENODEV;
967 list_for_each_entry(rp, &raw3270_devices, list) {
968 if (rp->minor != minor)
969 continue;
970 spin_lock_irqsave(get_ccwdev_lock(rp->cdev), flags);
971 atomic_set(&view->ref_count, 2);
972 view->dev = rp;
973 view->fn = fn;
974 view->model = rp->model;
975 view->rows = rp->rows;
976 view->cols = rp->cols;
977 view->ascebc = rp->ascebc;
978 spin_lock_init(&view->lock);
979 list_add(&view->list, &rp->view_list);
980 rc = 0;
981 spin_unlock_irqrestore(get_ccwdev_lock(rp->cdev), flags);
982 break;
983 }
984 mutex_unlock(&raw3270_mutex);
985 return rc;
986 }
987
988 /*
989 * Find specific view of device with minor "minor".
990 */
991 struct raw3270_view *
992 raw3270_find_view(struct raw3270_fn *fn, int minor)
993 {
994 struct raw3270 *rp;
995 struct raw3270_view *view, *tmp;
996 unsigned long flags;
997
998 mutex_lock(&raw3270_mutex);
999 view = ERR_PTR(-ENODEV);
1000 list_for_each_entry(rp, &raw3270_devices, list) {
1001 if (rp->minor != minor)
1002 continue;
1003 spin_lock_irqsave(get_ccwdev_lock(rp->cdev), flags);
1004 list_for_each_entry(tmp, &rp->view_list, list) {
1005 if (tmp->fn == fn) {
1006 raw3270_get_view(tmp);
1007 view = tmp;
1008 break;
1009 }
1010 }
1011 spin_unlock_irqrestore(get_ccwdev_lock(rp->cdev), flags);
1012 break;
1013 }
1014 mutex_unlock(&raw3270_mutex);
1015 return view;
1016 }
1017
1018 /*
1019 * Remove view from device and free view structure via call to view->fn->free.
1020 */
1021 void
1022 raw3270_del_view(struct raw3270_view *view)
1023 {
1024 unsigned long flags;
1025 struct raw3270 *rp;
1026 struct raw3270_view *nv;
1027
1028 rp = view->dev;
1029 spin_lock_irqsave(get_ccwdev_lock(rp->cdev), flags);
1030 if (rp->view == view) {
1031 view->fn->deactivate(view);
1032 rp->view = NULL;
1033 }
1034 list_del_init(&view->list);
1035 if (!rp->view && raw3270_state_ready(rp) &&
1036 !test_bit(RAW3270_FLAGS_FROZEN, &rp->flags)) {
1037 /* Try to activate another view. */
1038 list_for_each_entry(nv, &rp->view_list, list) {
1039 if (nv->fn->activate(nv) == 0) {
1040 rp->view = nv;
1041 break;
1042 }
1043 }
1044 }
1045 spin_unlock_irqrestore(get_ccwdev_lock(rp->cdev), flags);
1046 /* Wait for reference counter to drop to zero. */
1047 atomic_dec(&view->ref_count);
1048 wait_event(raw3270_wait_queue, atomic_read(&view->ref_count) == 0);
1049 if (view->fn->free)
1050 view->fn->free(view);
1051 }
1052
1053 /*
1054 * Remove a 3270 device structure.
1055 */
1056 static void
1057 raw3270_delete_device(struct raw3270 *rp)
1058 {
1059 struct ccw_device *cdev;
1060
1061 /* Remove from device chain. */
1062 mutex_lock(&raw3270_mutex);
1063 list_del_init(&rp->list);
1064 mutex_unlock(&raw3270_mutex);
1065
1066 /* Disconnect from ccw_device. */
1067 cdev = rp->cdev;
1068 rp->cdev = NULL;
1069 dev_set_drvdata(&cdev->dev, NULL);
1070 cdev->handler = NULL;
1071
1072 /* Put ccw_device structure. */
1073 put_device(&cdev->dev);
1074
1075 /* Now free raw3270 structure. */
1076 kfree(rp->ascebc);
1077 kfree(rp);
1078 }
1079
1080 static int
1081 raw3270_probe (struct ccw_device *cdev)
1082 {
1083 return 0;
1084 }
1085
1086 /*
1087 * Additional attributes for a 3270 device
1088 */
1089 static ssize_t
1090 raw3270_model_show(struct device *dev, struct device_attribute *attr, char *buf)
1091 {
1092 return snprintf(buf, PAGE_SIZE, "%i\n",
1093 ((struct raw3270 *) dev_get_drvdata(dev))->model);
1094 }
1095 static DEVICE_ATTR(model, 0444, raw3270_model_show, NULL);
1096
1097 static ssize_t
1098 raw3270_rows_show(struct device *dev, struct device_attribute *attr, char *buf)
1099 {
1100 return snprintf(buf, PAGE_SIZE, "%i\n",
1101 ((struct raw3270 *) dev_get_drvdata(dev))->rows);
1102 }
1103 static DEVICE_ATTR(rows, 0444, raw3270_rows_show, NULL);
1104
1105 static ssize_t
1106 raw3270_columns_show(struct device *dev, struct device_attribute *attr, char *buf)
1107 {
1108 return snprintf(buf, PAGE_SIZE, "%i\n",
1109 ((struct raw3270 *) dev_get_drvdata(dev))->cols);
1110 }
1111 static DEVICE_ATTR(columns, 0444, raw3270_columns_show, NULL);
1112
1113 static struct attribute * raw3270_attrs[] = {
1114 &dev_attr_model.attr,
1115 &dev_attr_rows.attr,
1116 &dev_attr_columns.attr,
1117 NULL,
1118 };
1119
1120 static struct attribute_group raw3270_attr_group = {
1121 .attrs = raw3270_attrs,
1122 };
1123
1124 static int raw3270_create_attributes(struct raw3270 *rp)
1125 {
1126 return sysfs_create_group(&rp->cdev->dev.kobj, &raw3270_attr_group);
1127 }
1128
1129 /*
1130 * Notifier for device addition/removal
1131 */
1132 static LIST_HEAD(raw3270_notifier);
1133
1134 int raw3270_register_notifier(struct raw3270_notifier *notifier)
1135 {
1136 struct raw3270 *rp;
1137
1138 mutex_lock(&raw3270_mutex);
1139 list_add_tail(&notifier->list, &raw3270_notifier);
1140 list_for_each_entry(rp, &raw3270_devices, list)
1141 notifier->create(rp->minor);
1142 mutex_unlock(&raw3270_mutex);
1143 return 0;
1144 }
1145
1146 void raw3270_unregister_notifier(struct raw3270_notifier *notifier)
1147 {
1148 struct raw3270 *rp;
1149
1150 mutex_lock(&raw3270_mutex);
1151 list_for_each_entry(rp, &raw3270_devices, list)
1152 notifier->destroy(rp->minor);
1153 list_del(&notifier->list);
1154 mutex_unlock(&raw3270_mutex);
1155 }
1156
1157 /*
1158 * Set 3270 device online.
1159 */
1160 static int
1161 raw3270_set_online (struct ccw_device *cdev)
1162 {
1163 struct raw3270_notifier *np;
1164 struct raw3270 *rp;
1165 int rc;
1166
1167 rp = raw3270_create_device(cdev);
1168 if (IS_ERR(rp))
1169 return PTR_ERR(rp);
1170 rc = raw3270_create_attributes(rp);
1171 if (rc)
1172 goto failure;
1173 raw3270_reset_device(rp);
1174 mutex_lock(&raw3270_mutex);
1175 list_for_each_entry(np, &raw3270_notifier, list)
1176 np->create(rp->minor);
1177 mutex_unlock(&raw3270_mutex);
1178 return 0;
1179
1180 failure:
1181 raw3270_delete_device(rp);
1182 return rc;
1183 }
1184
1185 /*
1186 * Remove 3270 device structure.
1187 */
1188 static void
1189 raw3270_remove (struct ccw_device *cdev)
1190 {
1191 unsigned long flags;
1192 struct raw3270 *rp;
1193 struct raw3270_view *v;
1194 struct raw3270_notifier *np;
1195
1196 rp = dev_get_drvdata(&cdev->dev);
1197 /*
1198 * _remove is the opposite of _probe; it's probe that
1199 * should set up rp. raw3270_remove gets entered for
1200 * devices even if they haven't been varied online.
1201 * Thus, rp may validly be NULL here.
1202 */
1203 if (rp == NULL)
1204 return;
1205
1206 sysfs_remove_group(&cdev->dev.kobj, &raw3270_attr_group);
1207
1208 /* Deactivate current view and remove all views. */
1209 spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
1210 if (rp->view) {
1211 if (rp->view->fn->deactivate)
1212 rp->view->fn->deactivate(rp->view);
1213 rp->view = NULL;
1214 }
1215 while (!list_empty(&rp->view_list)) {
1216 v = list_entry(rp->view_list.next, struct raw3270_view, list);
1217 if (v->fn->release)
1218 v->fn->release(v);
1219 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
1220 raw3270_del_view(v);
1221 spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
1222 }
1223 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
1224
1225 mutex_lock(&raw3270_mutex);
1226 list_for_each_entry(np, &raw3270_notifier, list)
1227 np->destroy(rp->minor);
1228 mutex_unlock(&raw3270_mutex);
1229
1230 /* Reset 3270 device. */
1231 raw3270_reset_device(rp);
1232 /* And finally remove it. */
1233 raw3270_delete_device(rp);
1234 }
1235
1236 /*
1237 * Set 3270 device offline.
1238 */
1239 static int
1240 raw3270_set_offline (struct ccw_device *cdev)
1241 {
1242 struct raw3270 *rp;
1243
1244 rp = dev_get_drvdata(&cdev->dev);
1245 if (test_bit(RAW3270_FLAGS_CONSOLE, &rp->flags))
1246 return -EBUSY;
1247 raw3270_remove(cdev);
1248 return 0;
1249 }
1250
1251 static int raw3270_pm_stop(struct ccw_device *cdev)
1252 {
1253 struct raw3270 *rp;
1254 struct raw3270_view *view;
1255 unsigned long flags;
1256
1257 rp = dev_get_drvdata(&cdev->dev);
1258 if (!rp)
1259 return 0;
1260 spin_lock_irqsave(get_ccwdev_lock(rp->cdev), flags);
1261 if (rp->view && rp->view->fn->deactivate)
1262 rp->view->fn->deactivate(rp->view);
1263 if (!test_bit(RAW3270_FLAGS_CONSOLE, &rp->flags)) {
1264 /*
1265 * Release tty and fullscreen for all non-console
1266 * devices.
1267 */
1268 list_for_each_entry(view, &rp->view_list, list) {
1269 if (view->fn->release)
1270 view->fn->release(view);
1271 }
1272 }
1273 set_bit(RAW3270_FLAGS_FROZEN, &rp->flags);
1274 spin_unlock_irqrestore(get_ccwdev_lock(rp->cdev), flags);
1275 return 0;
1276 }
1277
1278 static int raw3270_pm_start(struct ccw_device *cdev)
1279 {
1280 struct raw3270 *rp;
1281 unsigned long flags;
1282
1283 rp = dev_get_drvdata(&cdev->dev);
1284 if (!rp)
1285 return 0;
1286 spin_lock_irqsave(get_ccwdev_lock(rp->cdev), flags);
1287 clear_bit(RAW3270_FLAGS_FROZEN, &rp->flags);
1288 if (rp->view && rp->view->fn->activate)
1289 rp->view->fn->activate(rp->view);
1290 spin_unlock_irqrestore(get_ccwdev_lock(rp->cdev), flags);
1291 return 0;
1292 }
1293
1294 void raw3270_pm_unfreeze(struct raw3270_view *view)
1295 {
1296 #ifdef CONFIG_TN3270_CONSOLE
1297 struct raw3270 *rp;
1298
1299 rp = view->dev;
1300 if (rp && test_bit(RAW3270_FLAGS_FROZEN, &rp->flags))
1301 ccw_device_force_console(rp->cdev);
1302 #endif
1303 }
1304
1305 static struct ccw_device_id raw3270_id[] = {
1306 { CCW_DEVICE(0x3270, 0) },
1307 { CCW_DEVICE(0x3271, 0) },
1308 { CCW_DEVICE(0x3272, 0) },
1309 { CCW_DEVICE(0x3273, 0) },
1310 { CCW_DEVICE(0x3274, 0) },
1311 { CCW_DEVICE(0x3275, 0) },
1312 { CCW_DEVICE(0x3276, 0) },
1313 { CCW_DEVICE(0x3277, 0) },
1314 { CCW_DEVICE(0x3278, 0) },
1315 { CCW_DEVICE(0x3279, 0) },
1316 { CCW_DEVICE(0x3174, 0) },
1317 { /* end of list */ },
1318 };
1319
1320 static struct ccw_driver raw3270_ccw_driver = {
1321 .driver = {
1322 .name = "3270",
1323 .owner = THIS_MODULE,
1324 },
1325 .ids = raw3270_id,
1326 .probe = &raw3270_probe,
1327 .remove = &raw3270_remove,
1328 .set_online = &raw3270_set_online,
1329 .set_offline = &raw3270_set_offline,
1330 .freeze = &raw3270_pm_stop,
1331 .thaw = &raw3270_pm_start,
1332 .restore = &raw3270_pm_start,
1333 .int_class = IRQIO_C70,
1334 };
1335
1336 static int
1337 raw3270_init(void)
1338 {
1339 struct raw3270 *rp;
1340 int rc;
1341
1342 if (raw3270_registered)
1343 return 0;
1344 raw3270_registered = 1;
1345 rc = ccw_driver_register(&raw3270_ccw_driver);
1346 if (rc == 0) {
1347 /* Create attributes for early (= console) device. */
1348 mutex_lock(&raw3270_mutex);
1349 class3270 = class_create(THIS_MODULE, "3270");
1350 list_for_each_entry(rp, &raw3270_devices, list) {
1351 get_device(&rp->cdev->dev);
1352 raw3270_create_attributes(rp);
1353 }
1354 mutex_unlock(&raw3270_mutex);
1355 }
1356 return rc;
1357 }
1358
1359 static void
1360 raw3270_exit(void)
1361 {
1362 ccw_driver_unregister(&raw3270_ccw_driver);
1363 class_destroy(class3270);
1364 }
1365
1366 MODULE_LICENSE("GPL");
1367
1368 module_init(raw3270_init);
1369 module_exit(raw3270_exit);
1370
1371 EXPORT_SYMBOL(class3270);
1372 EXPORT_SYMBOL(raw3270_request_alloc);
1373 EXPORT_SYMBOL(raw3270_request_free);
1374 EXPORT_SYMBOL(raw3270_request_reset);
1375 EXPORT_SYMBOL(raw3270_request_set_cmd);
1376 EXPORT_SYMBOL(raw3270_request_add_data);
1377 EXPORT_SYMBOL(raw3270_request_set_data);
1378 EXPORT_SYMBOL(raw3270_request_set_idal);
1379 EXPORT_SYMBOL(raw3270_buffer_address);
1380 EXPORT_SYMBOL(raw3270_add_view);
1381 EXPORT_SYMBOL(raw3270_del_view);
1382 EXPORT_SYMBOL(raw3270_find_view);
1383 EXPORT_SYMBOL(raw3270_activate_view);
1384 EXPORT_SYMBOL(raw3270_deactivate_view);
1385 EXPORT_SYMBOL(raw3270_start);
1386 EXPORT_SYMBOL(raw3270_start_locked);
1387 EXPORT_SYMBOL(raw3270_start_irq);
1388 EXPORT_SYMBOL(raw3270_reset);
1389 EXPORT_SYMBOL(raw3270_register_notifier);
1390 EXPORT_SYMBOL(raw3270_unregister_notifier);
1391 EXPORT_SYMBOL(raw3270_wait_queue);
Linux kernel - Deliverables
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