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Staging: HTC Dream: add smd code
[linux-2.6/btrfs-unstable.git] / drivers / staging / dream / smd / smd.c
blob8f35be7193fb471c32c68546cdc983125bfb44df
1 /* arch/arm/mach-msm/smd.c
2 *
3 * Copyright (C) 2007 Google, Inc.
4 * Author: Brian Swetland <swetland@google.com>
5 *
6 * This software is licensed under the terms of the GNU General Public
7 * License version 2, as published by the Free Software Foundation, and
8 * may be copied, distributed, and modified under those terms.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 */
16
17 #include <linux/platform_device.h>
18 #include <linux/module.h>
19 #include <linux/fs.h>
20 #include <linux/cdev.h>
21 #include <linux/device.h>
22 #include <linux/wait.h>
23 #include <linux/interrupt.h>
24 #include <linux/irq.h>
25 #include <linux/list.h>
26 #include <linux/slab.h>
27 #include <linux/debugfs.h>
28 #include <linux/delay.h>
29 #include <linux/io.h>
30
31 #include <mach/msm_smd.h>
32 #include <mach/msm_iomap.h>
33 #include <mach/system.h>
34
35 #include "smd_private.h"
36 #include "../../../../arch/arm/mach-msm/proc_comm.h"
37
38 void (*msm_hw_reset_hook)(void);
39
40 #define MODULE_NAME "msm_smd"
41
42 enum {
43 MSM_SMD_DEBUG = 1U << 0,
44 MSM_SMSM_DEBUG = 1U << 0,
45 };
46
47 static int msm_smd_debug_mask;
48
49 module_param_named(debug_mask, msm_smd_debug_mask,
50 int, S_IRUGO | S_IWUSR | S_IWGRP);
51
52 void *smem_find(unsigned id, unsigned size);
53 static void smd_diag(void);
54
55 static unsigned last_heap_free = 0xffffffff;
56
57 #define MSM_A2M_INT(n) (MSM_CSR_BASE + 0x400 + (n) * 4)
58
59 static inline void notify_other_smsm(void)
60 {
61 writel(1, MSM_A2M_INT(5));
62 }
63
64 static inline void notify_other_smd(void)
65 {
66 writel(1, MSM_A2M_INT(0));
67 }
68
69 static void smd_diag(void)
70 {
71 char *x;
72
73 x = smem_find(ID_DIAG_ERR_MSG, SZ_DIAG_ERR_MSG);
74 if (x != 0) {
75 x[SZ_DIAG_ERR_MSG - 1] = 0;
76 pr_info("smem: DIAG '%s'\n", x);
77 }
78 }
79
80 /* call when SMSM_RESET flag is set in the A9's smsm_state */
81 static void handle_modem_crash(void)
82 {
83 pr_err("ARM9 has CRASHED\n");
84 smd_diag();
85
86 /* hard reboot if possible */
87 if (msm_hw_reset_hook)
88 msm_hw_reset_hook();
89
90 /* in this case the modem or watchdog should reboot us */
91 for (;;)
92 ;
93 }
94
95 extern int (*msm_check_for_modem_crash)(void);
96
97 static int check_for_modem_crash(void)
98 {
99 struct smsm_shared *smsm;
100
101 smsm = smem_find(ID_SHARED_STATE, 2 * sizeof(struct smsm_shared));
102
103 /* if the modem's not ready yet, we have to hope for the best */
104 if (!smsm)
105 return 0;
106
107 if (smsm[1].state & SMSM_RESET) {
108 handle_modem_crash();
109 return -1;
110 } else {
111 return 0;
112 }
113 }
114
115 #define SMD_SS_CLOSED 0x00000000
116 #define SMD_SS_OPENING 0x00000001
117 #define SMD_SS_OPENED 0x00000002
118 #define SMD_SS_FLUSHING 0x00000003
119 #define SMD_SS_CLOSING 0x00000004
120 #define SMD_SS_RESET 0x00000005
121 #define SMD_SS_RESET_OPENING 0x00000006
122
123 #define SMD_BUF_SIZE 8192
124 #define SMD_CHANNELS 64
125
126 #define SMD_HEADER_SIZE 20
127
128
129 /* the spinlock is used to synchronize between the
130 ** irq handler and code that mutates the channel
131 ** list or fiddles with channel state
132 */
133 static DEFINE_SPINLOCK(smd_lock);
134 static DEFINE_SPINLOCK(smem_lock);
135
136 /* the mutex is used during open() and close()
137 ** operations to avoid races while creating or
138 ** destroying smd_channel structures
139 */
140 static DEFINE_MUTEX(smd_creation_mutex);
141
142 static int smd_initialized;
143
144 struct smd_alloc_elm {
145 char name[20];
146 uint32_t cid;
147 uint32_t ctype;
148 uint32_t ref_count;
149 };
150
151 struct smd_half_channel {
152 unsigned state;
153 unsigned char fDSR;
154 unsigned char fCTS;
155 unsigned char fCD;
156 unsigned char fRI;
157 unsigned char fHEAD;
158 unsigned char fTAIL;
159 unsigned char fSTATE;
160 unsigned char fUNUSED;
161 unsigned tail;
162 unsigned head;
163 unsigned char data[SMD_BUF_SIZE];
164 };
165
166 struct smd_shared {
167 struct smd_half_channel ch0;
168 struct smd_half_channel ch1;
169 };
170
171 struct smd_channel {
172 volatile struct smd_half_channel *send;
173 volatile struct smd_half_channel *recv;
174 struct list_head ch_list;
175
176 unsigned current_packet;
177 unsigned n;
178 void *priv;
179 void (*notify)(void *priv, unsigned flags);
180
181 int (*read)(smd_channel_t *ch, void *data, int len);
182 int (*write)(smd_channel_t *ch, const void *data, int len);
183 int (*read_avail)(smd_channel_t *ch);
184 int (*write_avail)(smd_channel_t *ch);
185
186 void (*update_state)(smd_channel_t *ch);
187 unsigned last_state;
188
189 char name[32];
190 struct platform_device pdev;
191 };
192
193 static LIST_HEAD(smd_ch_closed_list);
194 static LIST_HEAD(smd_ch_list);
195
196 static unsigned char smd_ch_allocated[64];
197 static struct work_struct probe_work;
198
199 static void smd_alloc_channel(const char *name, uint32_t cid, uint32_t type);
200
201 static void smd_channel_probe_worker(struct work_struct *work)
202 {
203 struct smd_alloc_elm *shared;
204 unsigned n;
205
206 shared = smem_find(ID_CH_ALLOC_TBL, sizeof(*shared) * 64);
207
208 for (n = 0; n < 64; n++) {
209 if (smd_ch_allocated[n])
210 continue;
211 if (!shared[n].ref_count)
212 continue;
213 if (!shared[n].name[0])
214 continue;
215 smd_alloc_channel(shared[n].name,
216 shared[n].cid,
217 shared[n].ctype);
218 smd_ch_allocated[n] = 1;
219 }
220 }
221
222 static char *chstate(unsigned n)
223 {
224 switch (n) {
225 case SMD_SS_CLOSED:
226 return "CLOSED";
227 case SMD_SS_OPENING:
228 return "OPENING";
229 case SMD_SS_OPENED:
230 return "OPENED";
231 case SMD_SS_FLUSHING:
232 return "FLUSHING";
233 case SMD_SS_CLOSING:
234 return "CLOSING";
235 case SMD_SS_RESET:
236 return "RESET";
237 case SMD_SS_RESET_OPENING:
238 return "ROPENING";
239 default:
240 return "UNKNOWN";
241 }
242 }
243
244 /* how many bytes are available for reading */
245 static int smd_stream_read_avail(struct smd_channel *ch)
246 {
247 return (ch->recv->head - ch->recv->tail) & (SMD_BUF_SIZE - 1);
248 }
249
250 /* how many bytes we are free to write */
251 static int smd_stream_write_avail(struct smd_channel *ch)
252 {
253 return (SMD_BUF_SIZE - 1) -
254 ((ch->send->head - ch->send->tail) & (SMD_BUF_SIZE - 1));
255 }
256
257 static int smd_packet_read_avail(struct smd_channel *ch)
258 {
259 if (ch->current_packet) {
260 int n = smd_stream_read_avail(ch);
261 if (n > ch->current_packet)
262 n = ch->current_packet;
263 return n;
264 } else {
265 return 0;
266 }
267 }
268
269 static int smd_packet_write_avail(struct smd_channel *ch)
270 {
271 int n = smd_stream_write_avail(ch);
272 return n > SMD_HEADER_SIZE ? n - SMD_HEADER_SIZE : 0;
273 }
274
275 static int ch_is_open(struct smd_channel *ch)
276 {
277 return (ch->recv->state == SMD_SS_OPENED) &&
278 (ch->send->state == SMD_SS_OPENED);
279 }
280
281 /* provide a pointer and length to readable data in the fifo */
282 static unsigned ch_read_buffer(struct smd_channel *ch, void **ptr)
283 {
284 unsigned head = ch->recv->head;
285 unsigned tail = ch->recv->tail;
286 *ptr = (void *) (ch->recv->data + tail);
287
288 if (tail <= head)
289 return head - tail;
290 else
291 return SMD_BUF_SIZE - tail;
292 }
293
294 /* advance the fifo read pointer after data from ch_read_buffer is consumed */
295 static void ch_read_done(struct smd_channel *ch, unsigned count)
296 {
297 BUG_ON(count > smd_stream_read_avail(ch));
298 ch->recv->tail = (ch->recv->tail + count) & (SMD_BUF_SIZE - 1);
299 ch->recv->fTAIL = 1;
300 }
301
302 /* basic read interface to ch_read_{buffer,done} used
303 ** by smd_*_read() and update_packet_state()
304 ** will read-and-discard if the _data pointer is null
305 */
306 static int ch_read(struct smd_channel *ch, void *_data, int len)
307 {
308 void *ptr;
309 unsigned n;
310 unsigned char *data = _data;
311 int orig_len = len;
312
313 while (len > 0) {
314 n = ch_read_buffer(ch, &ptr);
315 if (n == 0)
316 break;
317
318 if (n > len)
319 n = len;
320 if (_data)
321 memcpy(data, ptr, n);
322
323 data += n;
324 len -= n;
325 ch_read_done(ch, n);
326 }
327
328 return orig_len - len;
329 }
330
331 static void update_stream_state(struct smd_channel *ch)
332 {
333 /* streams have no special state requiring updating */
334 }
335
336 static void update_packet_state(struct smd_channel *ch)
337 {
338 unsigned hdr[5];
339 int r;
340
341 /* can't do anything if we're in the middle of a packet */
342 if (ch->current_packet != 0)
343 return;
344
345 /* don't bother unless we can get the full header */
346 if (smd_stream_read_avail(ch) < SMD_HEADER_SIZE)
347 return;
348
349 r = ch_read(ch, hdr, SMD_HEADER_SIZE);
350 BUG_ON(r != SMD_HEADER_SIZE);
351
352 ch->current_packet = hdr[0];
353 }
354
355 /* provide a pointer and length to next free space in the fifo */
356 static unsigned ch_write_buffer(struct smd_channel *ch, void **ptr)
357 {
358 unsigned head = ch->send->head;
359 unsigned tail = ch->send->tail;
360 *ptr = (void *) (ch->send->data + head);
361
362 if (head < tail) {
363 return tail - head - 1;
364 } else {
365 if (tail == 0)
366 return SMD_BUF_SIZE - head - 1;
367 else
368 return SMD_BUF_SIZE - head;
369 }
370 }
371
372 /* advace the fifo write pointer after freespace
373 * from ch_write_buffer is filled
374 */
375 static void ch_write_done(struct smd_channel *ch, unsigned count)
376 {
377 BUG_ON(count > smd_stream_write_avail(ch));
378 ch->send->head = (ch->send->head + count) & (SMD_BUF_SIZE - 1);
379 ch->send->fHEAD = 1;
380 }
381
382 static void hc_set_state(volatile struct smd_half_channel *hc, unsigned n)
383 {
384 if (n == SMD_SS_OPENED) {
385 hc->fDSR = 1;
386 hc->fCTS = 1;
387 hc->fCD = 1;
388 } else {
389 hc->fDSR = 0;
390 hc->fCTS = 0;
391 hc->fCD = 0;
392 }
393 hc->state = n;
394 hc->fSTATE = 1;
395 notify_other_smd();
396 }
397
398 static void do_smd_probe(void)
399 {
400 struct smem_shared *shared = (void *) MSM_SHARED_RAM_BASE;
401 if (shared->heap_info.free_offset != last_heap_free) {
402 last_heap_free = shared->heap_info.free_offset;
403 schedule_work(&probe_work);
404 }
405 }
406
407 static void smd_state_change(struct smd_channel *ch,
408 unsigned last, unsigned next)
409 {
410 ch->last_state = next;
411
412 pr_info("SMD: ch %d %s -> %s\n", ch->n,
413 chstate(last), chstate(next));
414
415 switch (next) {
416 case SMD_SS_OPENING:
417 ch->recv->tail = 0;
418 case SMD_SS_OPENED:
419 if (ch->send->state != SMD_SS_OPENED)
420 hc_set_state(ch->send, SMD_SS_OPENED);
421 ch->notify(ch->priv, SMD_EVENT_OPEN);
422 break;
423 case SMD_SS_FLUSHING:
424 case SMD_SS_RESET:
425 /* we should force them to close? */
426 default:
427 ch->notify(ch->priv, SMD_EVENT_CLOSE);
428 }
429 }
430
431 static irqreturn_t smd_irq_handler(int irq, void *data)
432 {
433 unsigned long flags;
434 struct smd_channel *ch;
435 int do_notify = 0;
436 unsigned ch_flags;
437 unsigned tmp;
438
439 spin_lock_irqsave(&smd_lock, flags);
440 list_for_each_entry(ch, &smd_ch_list, ch_list) {
441 ch_flags = 0;
442 if (ch_is_open(ch)) {
443 if (ch->recv->fHEAD) {
444 ch->recv->fHEAD = 0;
445 ch_flags |= 1;
446 do_notify |= 1;
447 }
448 if (ch->recv->fTAIL) {
449 ch->recv->fTAIL = 0;
450 ch_flags |= 2;
451 do_notify |= 1;
452 }
453 if (ch->recv->fSTATE) {
454 ch->recv->fSTATE = 0;
455 ch_flags |= 4;
456 do_notify |= 1;
457 }
458 }
459 tmp = ch->recv->state;
460 if (tmp != ch->last_state)
461 smd_state_change(ch, ch->last_state, tmp);
462 if (ch_flags) {
463 ch->update_state(ch);
464 ch->notify(ch->priv, SMD_EVENT_DATA);
465 }
466 }
467 if (do_notify)
468 notify_other_smd();
469 spin_unlock_irqrestore(&smd_lock, flags);
470 do_smd_probe();
471 return IRQ_HANDLED;
472 }
473
474 static void smd_fake_irq_handler(unsigned long arg)
475 {
476 smd_irq_handler(0, NULL);
477 }
478
479 static DECLARE_TASKLET(smd_fake_irq_tasklet, smd_fake_irq_handler, 0);
480
481 void smd_sleep_exit(void)
482 {
483 unsigned long flags;
484 struct smd_channel *ch;
485 unsigned tmp;
486 int need_int = 0;
487
488 spin_lock_irqsave(&smd_lock, flags);
489 list_for_each_entry(ch, &smd_ch_list, ch_list) {
490 if (ch_is_open(ch)) {
491 if (ch->recv->fHEAD) {
492 if (msm_smd_debug_mask & MSM_SMD_DEBUG)
493 pr_info("smd_sleep_exit ch %d fHEAD "
494 "%x %x %x\n",
495 ch->n, ch->recv->fHEAD,
496 ch->recv->head, ch->recv->tail);
497 need_int = 1;
498 break;
499 }
500 if (ch->recv->fTAIL) {
501 if (msm_smd_debug_mask & MSM_SMD_DEBUG)
502 pr_info("smd_sleep_exit ch %d fTAIL "
503 "%x %x %x\n",
504 ch->n, ch->recv->fTAIL,
505 ch->send->head, ch->send->tail);
506 need_int = 1;
507 break;
508 }
509 if (ch->recv->fSTATE) {
510 if (msm_smd_debug_mask & MSM_SMD_DEBUG)
511 pr_info("smd_sleep_exit ch %d fSTATE %x"
512 "\n", ch->n, ch->recv->fSTATE);
513 need_int = 1;
514 break;
515 }
516 tmp = ch->recv->state;
517 if (tmp != ch->last_state) {
518 if (msm_smd_debug_mask & MSM_SMD_DEBUG)
519 pr_info("smd_sleep_exit ch %d "
520 "state %x != %x\n",
521 ch->n, tmp, ch->last_state);
522 need_int = 1;
523 break;
524 }
525 }
526 }
527 spin_unlock_irqrestore(&smd_lock, flags);
528 do_smd_probe();
529 if (need_int) {
530 if (msm_smd_debug_mask & MSM_SMD_DEBUG)
531 pr_info("smd_sleep_exit need interrupt\n");
532 tasklet_schedule(&smd_fake_irq_tasklet);
533 }
534 }
535
536
537 void smd_kick(smd_channel_t *ch)
538 {
539 unsigned long flags;
540 unsigned tmp;
541
542 spin_lock_irqsave(&smd_lock, flags);
543 ch->update_state(ch);
544 tmp = ch->recv->state;
545 if (tmp != ch->last_state) {
546 ch->last_state = tmp;
547 if (tmp == SMD_SS_OPENED)
548 ch->notify(ch->priv, SMD_EVENT_OPEN);
549 else
550 ch->notify(ch->priv, SMD_EVENT_CLOSE);
551 }
552 ch->notify(ch->priv, SMD_EVENT_DATA);
553 notify_other_smd();
554 spin_unlock_irqrestore(&smd_lock, flags);
555 }
556
557 static int smd_is_packet(int chn)
558 {
559 if ((chn > 4) || (chn == 1))
560 return 1;
561 else
562 return 0;
563 }
564
565 static int smd_stream_write(smd_channel_t *ch, const void *_data, int len)
566 {
567 void *ptr;
568 const unsigned char *buf = _data;
569 unsigned xfer;
570 int orig_len = len;
571
572 if (len < 0)
573 return -EINVAL;
574
575 while ((xfer = ch_write_buffer(ch, &ptr)) != 0) {
576 if (!ch_is_open(ch))
577 break;
578 if (xfer > len)
579 xfer = len;
580 memcpy(ptr, buf, xfer);
581 ch_write_done(ch, xfer);
582 len -= xfer;
583 buf += xfer;
584 if (len == 0)
585 break;
586 }
587
588 notify_other_smd();
589
590 return orig_len - len;
591 }
592
593 static int smd_packet_write(smd_channel_t *ch, const void *_data, int len)
594 {
595 unsigned hdr[5];
596
597 if (len < 0)
598 return -EINVAL;
599
600 if (smd_stream_write_avail(ch) < (len + SMD_HEADER_SIZE))
601 return -ENOMEM;
602
603 hdr[0] = len;
604 hdr[1] = hdr[2] = hdr[3] = hdr[4] = 0;
605
606 smd_stream_write(ch, hdr, sizeof(hdr));
607 smd_stream_write(ch, _data, len);
608
609 return len;
610 }
611
612 static int smd_stream_read(smd_channel_t *ch, void *data, int len)
613 {
614 int r;
615
616 if (len < 0)
617 return -EINVAL;
618
619 r = ch_read(ch, data, len);
620 if (r > 0)
621 notify_other_smd();
622
623 return r;
624 }
625
626 static int smd_packet_read(smd_channel_t *ch, void *data, int len)
627 {
628 unsigned long flags;
629 int r;
630
631 if (len < 0)
632 return -EINVAL;
633
634 if (len > ch->current_packet)
635 len = ch->current_packet;
636
637 r = ch_read(ch, data, len);
638 if (r > 0)
639 notify_other_smd();
640
641 spin_lock_irqsave(&smd_lock, flags);
642 ch->current_packet -= r;
643 update_packet_state(ch);
644 spin_unlock_irqrestore(&smd_lock, flags);
645
646 return r;
647 }
648
649 static void smd_alloc_channel(const char *name, uint32_t cid, uint32_t type)
650 {
651 struct smd_channel *ch;
652 struct smd_shared *shared;
653
654 shared = smem_alloc(ID_SMD_CHANNELS + cid, sizeof(*shared));
655 if (!shared) {
656 pr_err("smd_alloc_channel() cid %d does not exist\n", cid);
657 return;
658 }
659
660 ch = kzalloc(sizeof(struct smd_channel), GFP_KERNEL);
661 if (ch == 0) {
662 pr_err("smd_alloc_channel() out of memory\n");
663 return;
664 }
665
666 ch->send = &shared->ch0;
667 ch->recv = &shared->ch1;
668 ch->n = cid;
669
670 if (smd_is_packet(cid)) {
671 ch->read = smd_packet_read;
672 ch->write = smd_packet_write;
673 ch->read_avail = smd_packet_read_avail;
674 ch->write_avail = smd_packet_write_avail;
675 ch->update_state = update_packet_state;
676 } else {
677 ch->read = smd_stream_read;
678 ch->write = smd_stream_write;
679 ch->read_avail = smd_stream_read_avail;
680 ch->write_avail = smd_stream_write_avail;
681 ch->update_state = update_stream_state;
682 }
683
684 memcpy(ch->name, "SMD_", 4);
685 memcpy(ch->name + 4, name, 20);
686 ch->name[23] = 0;
687 ch->pdev.name = ch->name;
688 ch->pdev.id = -1;
689
690 pr_info("smd_alloc_channel() '%s' cid=%d, shared=%p\n",
691 ch->name, ch->n, shared);
692
693 mutex_lock(&smd_creation_mutex);
694 list_add(&ch->ch_list, &smd_ch_closed_list);
695 mutex_unlock(&smd_creation_mutex);
696
697 platform_device_register(&ch->pdev);
698 }
699
700 static void do_nothing_notify(void *priv, unsigned flags)
701 {
702 }
703
704 struct smd_channel *smd_get_channel(const char *name)
705 {
706 struct smd_channel *ch;
707
708 mutex_lock(&smd_creation_mutex);
709 list_for_each_entry(ch, &smd_ch_closed_list, ch_list) {
710 if (!strcmp(name, ch->name)) {
711 list_del(&ch->ch_list);
712 mutex_unlock(&smd_creation_mutex);
713 return ch;
714 }
715 }
716 mutex_unlock(&smd_creation_mutex);
717
718 return NULL;
719 }
720
721 int smd_open(const char *name, smd_channel_t **_ch,
722 void *priv, void (*notify)(void *, unsigned))
723 {
724 struct smd_channel *ch;
725 unsigned long flags;
726
727 if (smd_initialized == 0) {
728 pr_info("smd_open() before smd_init()\n");
729 return -ENODEV;
730 }
731
732 ch = smd_get_channel(name);
733 if (!ch)
734 return -ENODEV;
735
736 if (notify == 0)
737 notify = do_nothing_notify;
738
739 ch->notify = notify;
740 ch->current_packet = 0;
741 ch->last_state = SMD_SS_CLOSED;
742 ch->priv = priv;
743
744 *_ch = ch;
745
746 spin_lock_irqsave(&smd_lock, flags);
747 list_add(&ch->ch_list, &smd_ch_list);
748
749 /* If the remote side is CLOSING, we need to get it to
750 * move to OPENING (which we'll do by moving from CLOSED to
751 * OPENING) and then get it to move from OPENING to
752 * OPENED (by doing the same state change ourselves).
753 *
754 * Otherwise, it should be OPENING and we can move directly
755 * to OPENED so that it will follow.
756 */
757 if (ch->recv->state == SMD_SS_CLOSING) {
758 ch->send->head = 0;
759 hc_set_state(ch->send, SMD_SS_OPENING);
760 } else {
761 hc_set_state(ch->send, SMD_SS_OPENED);
762 }
763 spin_unlock_irqrestore(&smd_lock, flags);
764 smd_kick(ch);
765
766 return 0;
767 }
768
769 int smd_close(smd_channel_t *ch)
770 {
771 unsigned long flags;
772
773 pr_info("smd_close(%p)\n", ch);
774
775 if (ch == 0)
776 return -1;
777
778 spin_lock_irqsave(&smd_lock, flags);
779 ch->notify = do_nothing_notify;
780 list_del(&ch->ch_list);
781 hc_set_state(ch->send, SMD_SS_CLOSED);
782 spin_unlock_irqrestore(&smd_lock, flags);
783
784 mutex_lock(&smd_creation_mutex);
785 list_add(&ch->ch_list, &smd_ch_closed_list);
786 mutex_unlock(&smd_creation_mutex);
787
788 return 0;
789 }
790
791 int smd_read(smd_channel_t *ch, void *data, int len)
792 {
793 return ch->read(ch, data, len);
794 }
795
796 int smd_write(smd_channel_t *ch, const void *data, int len)
797 {
798 return ch->write(ch, data, len);
799 }
800
801 int smd_read_avail(smd_channel_t *ch)
802 {
803 return ch->read_avail(ch);
804 }
805
806 int smd_write_avail(smd_channel_t *ch)
807 {
808 return ch->write_avail(ch);
809 }
810
811 int smd_wait_until_readable(smd_channel_t *ch, int bytes)
812 {
813 return -1;
814 }
815
816 int smd_wait_until_writable(smd_channel_t *ch, int bytes)
817 {
818 return -1;
819 }
820
821 int smd_cur_packet_size(smd_channel_t *ch)
822 {
823 return ch->current_packet;
824 }
825
826
827 /* ------------------------------------------------------------------------- */
828
829 void *smem_alloc(unsigned id, unsigned size)
830 {
831 return smem_find(id, size);
832 }
833
834 static void *_smem_find(unsigned id, unsigned *size)
835 {
836 struct smem_shared *shared = (void *) MSM_SHARED_RAM_BASE;
837 struct smem_heap_entry *toc = shared->heap_toc;
838
839 if (id >= SMEM_NUM_ITEMS)
840 return 0;
841
842 if (toc[id].allocated) {
843 *size = toc[id].size;
844 return (void *) (MSM_SHARED_RAM_BASE + toc[id].offset);
845 }
846
847 return 0;
848 }
849
850 void *smem_find(unsigned id, unsigned size_in)
851 {
852 unsigned size;
853 void *ptr;
854
855 ptr = _smem_find(id, &size);
856 if (!ptr)
857 return 0;
858
859 size_in = ALIGN(size_in, 8);
860 if (size_in != size) {
861 pr_err("smem_find(%d, %d): wrong size %d\n",
862 id, size_in, size);
863 return 0;
864 }
865
866 return ptr;
867 }
868
869 static irqreturn_t smsm_irq_handler(int irq, void *data)
870 {
871 unsigned long flags;
872 struct smsm_shared *smsm;
873
874 spin_lock_irqsave(&smem_lock, flags);
875 smsm = smem_alloc(ID_SHARED_STATE,
876 2 * sizeof(struct smsm_shared));
877
878 if (smsm == 0) {
879 pr_info("<SM NO STATE>\n");
880 } else {
881 unsigned apps = smsm[0].state;
882 unsigned modm = smsm[1].state;
883
884 if (msm_smd_debug_mask & MSM_SMSM_DEBUG)
885 pr_info("<SM %08x %08x>\n", apps, modm);
886 if (modm & SMSM_RESET) {
887 handle_modem_crash();
888 } else {
889 apps |= SMSM_INIT;
890 if (modm & SMSM_SMDINIT)
891 apps |= SMSM_SMDINIT;
892 if (modm & SMSM_RPCINIT)
893 apps |= SMSM_RPCINIT;
894 }
895
896 if (smsm[0].state != apps) {
897 if (msm_smd_debug_mask & MSM_SMSM_DEBUG)
898 pr_info("<SM %08x NOTIFY>\n", apps);
899 smsm[0].state = apps;
900 do_smd_probe();
901 notify_other_smsm();
902 }
903 }
904 spin_unlock_irqrestore(&smem_lock, flags);
905 return IRQ_HANDLED;
906 }
907
908 int smsm_change_state(uint32_t clear_mask, uint32_t set_mask)
909 {
910 unsigned long flags;
911 struct smsm_shared *smsm;
912
913 spin_lock_irqsave(&smem_lock, flags);
914
915 smsm = smem_alloc(ID_SHARED_STATE,
916 2 * sizeof(struct smsm_shared));
917
918 if (smsm) {
919 if (smsm[1].state & SMSM_RESET)
920 handle_modem_crash();
921 smsm[0].state = (smsm[0].state & ~clear_mask) | set_mask;
922 if (msm_smd_debug_mask & MSM_SMSM_DEBUG)
923 pr_info("smsm_change_state %x\n",
924 smsm[0].state);
925 notify_other_smsm();
926 }
927
928 spin_unlock_irqrestore(&smem_lock, flags);
929
930 if (smsm == NULL) {
931 pr_err("smsm_change_state <SM NO STATE>\n");
932 return -EIO;
933 }
934 return 0;
935 }
936
937 uint32_t smsm_get_state(void)
938 {
939 unsigned long flags;
940 struct smsm_shared *smsm;
941 uint32_t rv;
942
943 spin_lock_irqsave(&smem_lock, flags);
944
945 smsm = smem_alloc(ID_SHARED_STATE,
946 2 * sizeof(struct smsm_shared));
947
948 if (smsm)
949 rv = smsm[1].state;
950 else
951 rv = 0;
952
953 if (rv & SMSM_RESET)
954 handle_modem_crash();
955
956 spin_unlock_irqrestore(&smem_lock, flags);
957
958 if (smsm == NULL)
959 pr_err("smsm_get_state <SM NO STATE>\n");
960 return rv;
961 }
962
963 int smsm_set_sleep_duration(uint32_t delay)
964 {
965 uint32_t *ptr;
966
967 ptr = smem_alloc(SMEM_SMSM_SLEEP_DELAY, sizeof(*ptr));
968 if (ptr == NULL) {
969 pr_err("smsm_set_sleep_duration <SM NO SLEEP_DELAY>\n");
970 return -EIO;
971 }
972 if (msm_smd_debug_mask & MSM_SMSM_DEBUG)
973 pr_info("smsm_set_sleep_duration %d -> %d\n",
974 *ptr, delay);
975 *ptr = delay;
976 return 0;
977 }
978
979 int smsm_set_interrupt_info(struct smsm_interrupt_info *info)
980 {
981 struct smsm_interrupt_info *ptr;
982
983 ptr = smem_alloc(SMEM_SMSM_INT_INFO, sizeof(*ptr));
984 if (ptr == NULL) {
985 pr_err("smsm_set_sleep_duration <SM NO INT_INFO>\n");
986 return -EIO;
987 }
988 if (msm_smd_debug_mask & MSM_SMSM_DEBUG)
989 pr_info("smsm_set_interrupt_info %x %x -> %x %x\n",
990 ptr->aArm_en_mask, ptr->aArm_interrupts_pending,
991 info->aArm_en_mask, info->aArm_interrupts_pending);
992 *ptr = *info;
993 return 0;
994 }
995
996 #define MAX_NUM_SLEEP_CLIENTS 64
997 #define MAX_SLEEP_NAME_LEN 8
998
999 #define NUM_GPIO_INT_REGISTERS 6
1000 #define GPIO_SMEM_NUM_GROUPS 2
1001 #define GPIO_SMEM_MAX_PC_INTERRUPTS 8
1002
1003 struct tramp_gpio_save {
1004 unsigned int enable;
1005 unsigned int detect;
1006 unsigned int polarity;
1007 };
1008
1009 struct tramp_gpio_smem {
1010 uint16_t num_fired[GPIO_SMEM_NUM_GROUPS];
1011 uint16_t fired[GPIO_SMEM_NUM_GROUPS][GPIO_SMEM_MAX_PC_INTERRUPTS];
1012 uint32_t enabled[NUM_GPIO_INT_REGISTERS];
1013 uint32_t detection[NUM_GPIO_INT_REGISTERS];
1014 uint32_t polarity[NUM_GPIO_INT_REGISTERS];
1015 };
1016
1017
1018 void smsm_print_sleep_info(void)
1019 {
1020 unsigned long flags;
1021 uint32_t *ptr;
1022 struct tramp_gpio_smem *gpio;
1023 struct smsm_interrupt_info *int_info;
1024
1025
1026 spin_lock_irqsave(&smem_lock, flags);
1027
1028 ptr = smem_alloc(SMEM_SMSM_SLEEP_DELAY, sizeof(*ptr));
1029 if (ptr)
1030 pr_info("SMEM_SMSM_SLEEP_DELAY: %x\n", *ptr);
1031
1032 ptr = smem_alloc(SMEM_SMSM_LIMIT_SLEEP, sizeof(*ptr));
1033 if (ptr)
1034 pr_info("SMEM_SMSM_LIMIT_SLEEP: %x\n", *ptr);
1035
1036 ptr = smem_alloc(SMEM_SLEEP_POWER_COLLAPSE_DISABLED, sizeof(*ptr));
1037 if (ptr)
1038 pr_info("SMEM_SLEEP_POWER_COLLAPSE_DISABLED: %x\n", *ptr);
1039
1040 int_info = smem_alloc(SMEM_SMSM_INT_INFO, sizeof(*int_info));
1041 if (int_info)
1042 pr_info("SMEM_SMSM_INT_INFO %x %x %x\n",
1043 int_info->aArm_en_mask,
1044 int_info->aArm_interrupts_pending,
1045 int_info->aArm_wakeup_reason);
1046
1047 gpio = smem_alloc(SMEM_GPIO_INT, sizeof(*gpio));
1048 if (gpio) {
1049 int i;
1050 for (i = 0; i < NUM_GPIO_INT_REGISTERS; i++)
1051 pr_info("SMEM_GPIO_INT: %d: e %x d %x p %x\n",
1052 i, gpio->enabled[i], gpio->detection[i],
1053 gpio->polarity[i]);
1054
1055 for (i = 0; i < GPIO_SMEM_NUM_GROUPS; i++)
1056 pr_info("SMEM_GPIO_INT: %d: f %d: %d %d...\n",
1057 i, gpio->num_fired[i], gpio->fired[i][0],
1058 gpio->fired[i][1]);
1059 }
1060
1061 spin_unlock_irqrestore(&smem_lock, flags);
1062 }
1063
1064 int smd_core_init(void)
1065 {
1066 int r;
1067 pr_info("smd_core_init()\n");
1068
1069 r = request_irq(INT_A9_M2A_0, smd_irq_handler,
1070 IRQF_TRIGGER_RISING, "smd_dev", 0);
1071 if (r < 0)
1072 return r;
1073 r = enable_irq_wake(INT_A9_M2A_0);
1074 if (r < 0)
1075 pr_err("smd_core_init: enable_irq_wake failed for A9_M2A_0\n");
1076
1077 r = request_irq(INT_A9_M2A_5, smsm_irq_handler,
1078 IRQF_TRIGGER_RISING, "smsm_dev", 0);
1079 if (r < 0) {
1080 free_irq(INT_A9_M2A_0, 0);
1081 return r;
1082 }
1083 r = enable_irq_wake(INT_A9_M2A_5);
1084 if (r < 0)
1085 pr_err("smd_core_init: enable_irq_wake failed for A9_M2A_5\n");
1086
1087 /* we may have missed a signal while booting -- fake
1088 * an interrupt to make sure we process any existing
1089 * state
1090 */
1091 smsm_irq_handler(0, 0);
1092
1093 pr_info("smd_core_init() done\n");
1094
1095 return 0;
1096 }
1097
1098 #if defined(CONFIG_DEBUG_FS)
1099
1100 static int dump_ch(char *buf, int max, int n,
1101 struct smd_half_channel *s,
1102 struct smd_half_channel *r)
1103 {
1104 return scnprintf(
1105 buf, max,
1106 "ch%02d:"
1107 " %8s(%04d/%04d) %c%c%c%c%c%c%c <->"
1108 " %8s(%04d/%04d) %c%c%c%c%c%c%c\n", n,
1109 chstate(s->state), s->tail, s->head,
1110 s->fDSR ? 'D' : 'd',
1111 s->fCTS ? 'C' : 'c',
1112 s->fCD ? 'C' : 'c',
1113 s->fRI ? 'I' : 'i',
1114 s->fHEAD ? 'W' : 'w',
1115 s->fTAIL ? 'R' : 'r',
1116 s->fSTATE ? 'S' : 's',
1117 chstate(r->state), r->tail, r->head,
1118 r->fDSR ? 'D' : 'd',
1119 r->fCTS ? 'R' : 'r',
1120 r->fCD ? 'C' : 'c',
1121 r->fRI ? 'I' : 'i',
1122 r->fHEAD ? 'W' : 'w',
1123 r->fTAIL ? 'R' : 'r',
1124 r->fSTATE ? 'S' : 's'
1125 );
1126 }
1127
1128 static int debug_read_stat(char *buf, int max)
1129 {
1130 struct smsm_shared *smsm;
1131 char *msg;
1132 int i = 0;
1133
1134 smsm = smem_find(ID_SHARED_STATE,
1135 2 * sizeof(struct smsm_shared));
1136
1137 msg = smem_find(ID_DIAG_ERR_MSG, SZ_DIAG_ERR_MSG);
1138
1139 if (smsm) {
1140 if (smsm[1].state & SMSM_RESET)
1141 i += scnprintf(buf + i, max - i,
1142 "smsm: ARM9 HAS CRASHED\n");
1143 i += scnprintf(buf + i, max - i, "smsm: a9: %08x a11: %08x\n",
1144 smsm[0].state, smsm[1].state);
1145 } else {
1146 i += scnprintf(buf + i, max - i, "smsm: cannot find\n");
1147 }
1148 if (msg) {
1149 msg[SZ_DIAG_ERR_MSG - 1] = 0;
1150 i += scnprintf(buf + i, max - i, "diag: '%s'\n", msg);
1151 }
1152 return i;
1153 }
1154
1155 static int debug_read_mem(char *buf, int max)
1156 {
1157 unsigned n;
1158 struct smem_shared *shared = (void *) MSM_SHARED_RAM_BASE;
1159 struct smem_heap_entry *toc = shared->heap_toc;
1160 int i = 0;
1161
1162 i += scnprintf(buf + i, max - i,
1163 "heap: init=%d free=%d remain=%d\n",
1164 shared->heap_info.initialized,
1165 shared->heap_info.free_offset,
1166 shared->heap_info.heap_remaining);
1167
1168 for (n = 0; n < SMEM_NUM_ITEMS; n++) {
1169 if (toc[n].allocated == 0)
1170 continue;
1171 i += scnprintf(buf + i, max - i,
1172 "%04d: offsed %08x size %08x\n",
1173 n, toc[n].offset, toc[n].size);
1174 }
1175 return i;
1176 }
1177
1178 static int debug_read_ch(char *buf, int max)
1179 {
1180 struct smd_shared *shared;
1181 int n, i = 0;
1182
1183 for (n = 0; n < SMD_CHANNELS; n++) {
1184 shared = smem_find(ID_SMD_CHANNELS + n,
1185 sizeof(struct smd_shared));
1186 if (shared == 0)
1187 continue;
1188 i += dump_ch(buf + i, max - i, n, &shared->ch0, &shared->ch1);
1189 }
1190
1191 return i;
1192 }
1193
1194 static int debug_read_version(char *buf, int max)
1195 {
1196 struct smem_shared *shared = (void *) MSM_SHARED_RAM_BASE;
1197 unsigned version = shared->version[VERSION_MODEM];
1198 return sprintf(buf, "%d.%d\n", version >> 16, version & 0xffff);
1199 }
1200
1201 static int debug_read_build_id(char *buf, int max)
1202 {
1203 unsigned size;
1204 void *data;
1205
1206 data = _smem_find(SMEM_HW_SW_BUILD_ID, &size);
1207 if (!data)
1208 return 0;
1209
1210 if (size >= max)
1211 size = max;
1212 memcpy(buf, data, size);
1213
1214 return size;
1215 }
1216
1217 static int debug_read_alloc_tbl(char *buf, int max)
1218 {
1219 struct smd_alloc_elm *shared;
1220 int n, i = 0;
1221
1222 shared = smem_find(ID_CH_ALLOC_TBL, sizeof(*shared) * 64);
1223
1224 for (n = 0; n < 64; n++) {
1225 if (shared[n].ref_count == 0)
1226 continue;
1227 i += scnprintf(buf + i, max - i,
1228 "%03d: %20s cid=%02d ctype=%d ref_count=%d\n",
1229 n, shared[n].name, shared[n].cid,
1230 shared[n].ctype, shared[n].ref_count);
1231 }
1232
1233 return i;
1234 }
1235
1236 static int debug_boom(char *buf, int max)
1237 {
1238 unsigned ms = 5000;
1239 msm_proc_comm(PCOM_RESET_MODEM, &ms, 0);
1240 return 0;
1241 }
1242
1243 #define DEBUG_BUFMAX 4096
1244 static char debug_buffer[DEBUG_BUFMAX];
1245
1246 static ssize_t debug_read(struct file *file, char __user *buf,
1247 size_t count, loff_t *ppos)
1248 {
1249 int (*fill)(char *buf, int max) = file->private_data;
1250 int bsize = fill(debug_buffer, DEBUG_BUFMAX);
1251 return simple_read_from_buffer(buf, count, ppos, debug_buffer, bsize);
1252 }
1253
1254 static int debug_open(struct inode *inode, struct file *file)
1255 {
1256 file->private_data = inode->i_private;
1257 return 0;
1258 }
1259
1260 static const struct file_operations debug_ops = {
1261 .read = debug_read,
1262 .open = debug_open,
1263 };
1264
1265 static void debug_create(const char *name, mode_t mode,
1266 struct dentry *dent,
1267 int (*fill)(char *buf, int max))
1268 {
1269 debugfs_create_file(name, mode, dent, fill, &debug_ops);
1270 }
1271
1272 static void smd_debugfs_init(void)
1273 {
1274 struct dentry *dent;
1275
1276 dent = debugfs_create_dir("smd", 0);
1277 if (IS_ERR(dent))
1278 return;
1279
1280 debug_create("ch", 0444, dent, debug_read_ch);
1281 debug_create("stat", 0444, dent, debug_read_stat);
1282 debug_create("mem", 0444, dent, debug_read_mem);
1283 debug_create("version", 0444, dent, debug_read_version);
1284 debug_create("tbl", 0444, dent, debug_read_alloc_tbl);
1285 debug_create("build", 0444, dent, debug_read_build_id);
1286 debug_create("boom", 0444, dent, debug_boom);
1287 }
1288 #else
1289 static void smd_debugfs_init(void) {}
1290 #endif
1291
1292 static int __init msm_smd_probe(struct platform_device *pdev)
1293 {
1294 pr_info("smd_init()\n");
1295
1296 INIT_WORK(&probe_work, smd_channel_probe_worker);
1297
1298 if (smd_core_init()) {
1299 pr_err("smd_core_init() failed\n");
1300 return -1;
1301 }
1302
1303 do_smd_probe();
1304
1305 msm_check_for_modem_crash = check_for_modem_crash;
1306
1307 smd_debugfs_init();
1308 smd_initialized = 1;
1309
1310 return 0;
1311 }
1312
1313 static struct platform_driver msm_smd_driver = {
1314 .probe = msm_smd_probe,
1315 .driver = {
1316 .name = MODULE_NAME,
1317 .owner = THIS_MODULE,
1318 },
1319 };
1320
1321 static int __init msm_smd_init(void)
1322 {
1323 return platform_driver_register(&msm_smd_driver);
1324 }
1325
1326 module_init(msm_smd_init);
1327
1328 MODULE_DESCRIPTION("MSM Shared Memory Core");
1329 MODULE_AUTHOR("Brian Swetland <swetland@google.com>");
1330 MODULE_LICENSE("GPL");
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