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diff --git a/arch/arm/mach-msm/smd.c b/arch/arm/mach-msm/smd.c
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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
30#include <mach/msm_smd.h>
31#include <mach/system.h>
32
33#include "smd_private.h"
34#include "proc_comm.h"
35
36#if defined(CONFIG_ARCH_QSD8X50)
37#define CONFIG_QDSP6 1
38#endif
39
40void (*msm_hw_reset_hook)(void);
41
42#define MODULE_NAME "msm_smd"
43
44enum {
45 MSM_SMD_DEBUG = 1U << 0,
46 MSM_SMSM_DEBUG = 1U << 0,
47};
48
49static int msm_smd_debug_mask;
50
51struct shared_info {
52 int ready;
53 unsigned state;
54};
55
56static unsigned dummy_state[SMSM_STATE_COUNT];
57
58static struct shared_info smd_info = {
59 .state = (unsigned) &dummy_state,
60};
61
62module_param_named(debug_mask, msm_smd_debug_mask,
63 int, S_IRUGO | S_IWUSR | S_IWGRP);
64
65static unsigned last_heap_free = 0xffffffff;
66
67static inline void notify_other_smsm(void)
68{
69 msm_a2m_int(5);
70#ifdef CONFIG_QDSP6
71 msm_a2m_int(8);
72#endif
73}
74
75static inline void notify_modem_smd(void)
76{
77 msm_a2m_int(0);
78}
79
80static inline void notify_dsp_smd(void)
81{
82 msm_a2m_int(8);
83}
84
85static void smd_diag(void)
86{
87 char *x;
88
89 x = smem_find(ID_DIAG_ERR_MSG, SZ_DIAG_ERR_MSG);
90 if (x != 0) {
91 x[SZ_DIAG_ERR_MSG - 1] = 0;
92 pr_info("smem: DIAG '%s'\n", x);
93 }
94}
95
96/* call when SMSM_RESET flag is set in the A9's smsm_state */
97static void handle_modem_crash(void)
98{
99 pr_err("ARM9 has CRASHED\n");
100 smd_diag();
101
102 /* hard reboot if possible */
103 if (msm_hw_reset_hook)
104 msm_hw_reset_hook();
105
106 /* in this case the modem or watchdog should reboot us */
107 for (;;)
108 ;
109}
110
111uint32_t raw_smsm_get_state(enum smsm_state_item item)
112{
113 return readl(smd_info.state + item * 4);
114}
115
116static int check_for_modem_crash(void)
117{
118 if (raw_smsm_get_state(SMSM_STATE_MODEM) & SMSM_RESET) {
119 handle_modem_crash();
120 return -1;
121 }
122 return 0;
123}
124
125/* the spinlock is used to synchronize between the
126 * irq handler and code that mutates the channel
127 * list or fiddles with channel state
128 */
129DEFINE_SPINLOCK(smd_lock);
130DEFINE_SPINLOCK(smem_lock);
131
132/* the mutex is used during open() and close()
133 * operations to avoid races while creating or
134 * destroying smd_channel structures
135 */
136static DEFINE_MUTEX(smd_creation_mutex);
137
138static int smd_initialized;
139
140LIST_HEAD(smd_ch_closed_list);
141LIST_HEAD(smd_ch_list_modem);
142LIST_HEAD(smd_ch_list_dsp);
143
144static unsigned char smd_ch_allocated[64];
145static struct work_struct probe_work;
146
147/* how many bytes are available for reading */
148static int smd_stream_read_avail(struct smd_channel *ch)
149{
150 return (ch->recv->head - ch->recv->tail) & ch->fifo_mask;
151}
152
153/* how many bytes we are free to write */
154static int smd_stream_write_avail(struct smd_channel *ch)
155{
156 return ch->fifo_mask -
157 ((ch->send->head - ch->send->tail) & ch->fifo_mask);
158}
159
160static int smd_packet_read_avail(struct smd_channel *ch)
161{
162 if (ch->current_packet) {
163 int n = smd_stream_read_avail(ch);
164 if (n > ch->current_packet)
165 n = ch->current_packet;
166 return n;
167 } else {
168 return 0;
169 }
170}
171
172static int smd_packet_write_avail(struct smd_channel *ch)
173{
174 int n = smd_stream_write_avail(ch);
175 return n > SMD_HEADER_SIZE ? n - SMD_HEADER_SIZE : 0;
176}
177
178static int ch_is_open(struct smd_channel *ch)
179{
180 return (ch->recv->state == SMD_SS_OPENED) &&
181 (ch->send->state == SMD_SS_OPENED);
182}
183
184/* provide a pointer and length to readable data in the fifo */
185static unsigned ch_read_buffer(struct smd_channel *ch, void **ptr)
186{
187 unsigned head = ch->recv->head;
188 unsigned tail = ch->recv->tail;
189 *ptr = (void *) (ch->recv_data + tail);
190
191 if (tail <= head)
192 return head - tail;
193 else
194 return ch->fifo_size - tail;
195}
196
197/* advance the fifo read pointer after data from ch_read_buffer is consumed */
198static void ch_read_done(struct smd_channel *ch, unsigned count)
199{
200 BUG_ON(count > smd_stream_read_avail(ch));
201 ch->recv->tail = (ch->recv->tail + count) & ch->fifo_mask;
202 ch->send->fTAIL = 1;
203}
204
205/* basic read interface to ch_read_{buffer,done} used
206 * by smd_*_read() and update_packet_state()
207 * will read-and-discard if the _data pointer is null
208 */
209static int ch_read(struct smd_channel *ch, void *_data, int len)
210{
211 void *ptr;
212 unsigned n;
213 unsigned char *data = _data;
214 int orig_len = len;
215
216 while (len > 0) {
217 n = ch_read_buffer(ch, &ptr);
218 if (n == 0)
219 break;
220
221 if (n > len)
222 n = len;
223 if (_data)
224 memcpy(data, ptr, n);
225
226 data += n;
227 len -= n;
228 ch_read_done(ch, n);
229 }
230
231 return orig_len - len;
232}
233
234static void update_stream_state(struct smd_channel *ch)
235{
236 /* streams have no special state requiring updating */
237}
238
239static void update_packet_state(struct smd_channel *ch)
240{
241 unsigned hdr[5];
242 int r;
243
244 /* can't do anything if we're in the middle of a packet */
245 if (ch->current_packet != 0)
246 return;
247
248 /* don't bother unless we can get the full header */
249 if (smd_stream_read_avail(ch) < SMD_HEADER_SIZE)
250 return;
251
252 r = ch_read(ch, hdr, SMD_HEADER_SIZE);
253 BUG_ON(r != SMD_HEADER_SIZE);
254
255 ch->current_packet = hdr[0];
256}
257
258/* provide a pointer and length to next free space in the fifo */
259static unsigned ch_write_buffer(struct smd_channel *ch, void **ptr)
260{
261 unsigned head = ch->send->head;
262 unsigned tail = ch->send->tail;
263 *ptr = (void *) (ch->send_data + head);
264
265 if (head < tail) {
266 return tail - head - 1;
267 } else {
268 if (tail == 0)
269 return ch->fifo_size - head - 1;
270 else
271 return ch->fifo_size - head;
272 }
273}
274
275/* advace the fifo write pointer after freespace
276 * from ch_write_buffer is filled
277 */
278static void ch_write_done(struct smd_channel *ch, unsigned count)
279{
280 BUG_ON(count > smd_stream_write_avail(ch));
281 ch->send->head = (ch->send->head + count) & ch->fifo_mask;
282 ch->send->fHEAD = 1;
283}
284
285static void ch_set_state(struct smd_channel *ch, unsigned n)
286{
287 if (n == SMD_SS_OPENED) {
288 ch->send->fDSR = 1;
289 ch->send->fCTS = 1;
290 ch->send->fCD = 1;
291 } else {
292 ch->send->fDSR = 0;
293 ch->send->fCTS = 0;
294 ch->send->fCD = 0;
295 }
296 ch->send->state = n;
297 ch->send->fSTATE = 1;
298 ch->notify_other_cpu();
299}
300
301static void do_smd_probe(void)
302{
303 struct smem_shared *shared = (void *) MSM_SHARED_RAM_BASE;
304 if (shared->heap_info.free_offset != last_heap_free) {
305 last_heap_free = shared->heap_info.free_offset;
306 schedule_work(&probe_work);
307 }
308}
309
310static void smd_state_change(struct smd_channel *ch,
311 unsigned last, unsigned next)
312{
313 ch->last_state = next;
314
315 pr_info("SMD: ch %d %d -> %d\n", ch->n, last, next);
316
317 switch (next) {
318 case SMD_SS_OPENING:
319 ch->recv->tail = 0;
320 case SMD_SS_OPENED:
321 if (ch->send->state != SMD_SS_OPENED)
322 ch_set_state(ch, SMD_SS_OPENED);
323 ch->notify(ch->priv, SMD_EVENT_OPEN);
324 break;
325 case SMD_SS_FLUSHING:
326 case SMD_SS_RESET:
327 /* we should force them to close? */
328 default:
329 ch->notify(ch->priv, SMD_EVENT_CLOSE);
330 }
331}
332
333static void handle_smd_irq(struct list_head *list, void (*notify)(void))
334{
335 unsigned long flags;
336 struct smd_channel *ch;
337 int do_notify = 0;
338 unsigned ch_flags;
339 unsigned tmp;
340
341 spin_lock_irqsave(&smd_lock, flags);
342 list_for_each_entry(ch, list, ch_list) {
343 ch_flags = 0;
344 if (ch_is_open(ch)) {
345 if (ch->recv->fHEAD) {
346 ch->recv->fHEAD = 0;
347 ch_flags |= 1;
348 do_notify |= 1;
349 }
350 if (ch->recv->fTAIL) {
351 ch->recv->fTAIL = 0;
352 ch_flags |= 2;
353 do_notify |= 1;
354 }
355 if (ch->recv->fSTATE) {
356 ch->recv->fSTATE = 0;
357 ch_flags |= 4;
358 do_notify |= 1;
359 }
360 }
361 tmp = ch->recv->state;
362 if (tmp != ch->last_state)
363 smd_state_change(ch, ch->last_state, tmp);
364 if (ch_flags) {
365 ch->update_state(ch);
366 ch->notify(ch->priv, SMD_EVENT_DATA);
367 }
368 }
369 if (do_notify)
370 notify();
371 spin_unlock_irqrestore(&smd_lock, flags);
372 do_smd_probe();
373}
374
375static irqreturn_t smd_modem_irq_handler(int irq, void *data)
376{
377 handle_smd_irq(&smd_ch_list_modem, notify_modem_smd);
378 return IRQ_HANDLED;
379}
380
381#if defined(CONFIG_QDSP6)
382static irqreturn_t smd_dsp_irq_handler(int irq, void *data)
383{
384 handle_smd_irq(&smd_ch_list_dsp, notify_dsp_smd);
385 return IRQ_HANDLED;
386}
387#endif
388
389static void smd_fake_irq_handler(unsigned long arg)
390{
391 handle_smd_irq(&smd_ch_list_modem, notify_modem_smd);
392 handle_smd_irq(&smd_ch_list_dsp, notify_dsp_smd);
393}
394
395static DECLARE_TASKLET(smd_fake_irq_tasklet, smd_fake_irq_handler, 0);
396
397static inline int smd_need_int(struct smd_channel *ch)
398{
399 if (ch_is_open(ch)) {
400 if (ch->recv->fHEAD || ch->recv->fTAIL || ch->recv->fSTATE)
401 return 1;
402 if (ch->recv->state != ch->last_state)
403 return 1;
404 }
405 return 0;
406}
407
408void smd_sleep_exit(void)
409{
410 unsigned long flags;
411 struct smd_channel *ch;
412 int need_int = 0;
413
414 spin_lock_irqsave(&smd_lock, flags);
415 list_for_each_entry(ch, &smd_ch_list_modem, ch_list) {
416 if (smd_need_int(ch)) {
417 need_int = 1;
418 break;
419 }
420 }
421 list_for_each_entry(ch, &smd_ch_list_dsp, ch_list) {
422 if (smd_need_int(ch)) {
423 need_int = 1;
424 break;
425 }
426 }
427 spin_unlock_irqrestore(&smd_lock, flags);
428 do_smd_probe();
429
430 if (need_int) {
431 if (msm_smd_debug_mask & MSM_SMD_DEBUG)
432 pr_info("smd_sleep_exit need interrupt\n");
433 tasklet_schedule(&smd_fake_irq_tasklet);
434 }
435}
436
437
438void smd_kick(smd_channel_t *ch)
439{
440 unsigned long flags;
441 unsigned tmp;
442
443 spin_lock_irqsave(&smd_lock, flags);
444 ch->update_state(ch);
445 tmp = ch->recv->state;
446 if (tmp != ch->last_state) {
447 ch->last_state = tmp;
448 if (tmp == SMD_SS_OPENED)
449 ch->notify(ch->priv, SMD_EVENT_OPEN);
450 else
451 ch->notify(ch->priv, SMD_EVENT_CLOSE);
452 }
453 ch->notify(ch->priv, SMD_EVENT_DATA);
454 ch->notify_other_cpu();
455 spin_unlock_irqrestore(&smd_lock, flags);
456}
457
458static int smd_is_packet(int chn, unsigned type)
459{
460 type &= SMD_KIND_MASK;
461 if (type == SMD_KIND_PACKET)
462 return 1;
463 if (type == SMD_KIND_STREAM)
464 return 0;
465
466 /* older AMSS reports SMD_KIND_UNKNOWN always */
467 if ((chn > 4) || (chn == 1))
468 return 1;
469 else
470 return 0;
471}
472
473static int smd_stream_write(smd_channel_t *ch, const void *_data, int len)
474{
475 void *ptr;
476 const unsigned char *buf = _data;
477 unsigned xfer;
478 int orig_len = len;
479
480 if (len < 0)
481 return -EINVAL;
482
483 while ((xfer = ch_write_buffer(ch, &ptr)) != 0) {
484 if (!ch_is_open(ch))
485 break;
486 if (xfer > len)
487 xfer = len;
488 memcpy(ptr, buf, xfer);
489 ch_write_done(ch, xfer);
490 len -= xfer;
491 buf += xfer;
492 if (len == 0)
493 break;
494 }
495
496 ch->notify_other_cpu();
497
498 return orig_len - len;
499}
500
501static int smd_packet_write(smd_channel_t *ch, const void *_data, int len)
502{
503 unsigned hdr[5];
504
505 if (len < 0)
506 return -EINVAL;
507
508 if (smd_stream_write_avail(ch) < (len + SMD_HEADER_SIZE))
509 return -ENOMEM;
510
511 hdr[0] = len;
512 hdr[1] = hdr[2] = hdr[3] = hdr[4] = 0;
513
514 smd_stream_write(ch, hdr, sizeof(hdr));
515 smd_stream_write(ch, _data, len);
516
517 return len;
518}
519
520static int smd_stream_read(smd_channel_t *ch, void *data, int len)
521{
522 int r;
523
524 if (len < 0)
525 return -EINVAL;
526
527 r = ch_read(ch, data, len);
528 if (r > 0)
529 ch->notify_other_cpu();
530
531 return r;
532}
533
534static int smd_packet_read(smd_channel_t *ch, void *data, int len)
535{
536 unsigned long flags;
537 int r;
538
539 if (len < 0)
540 return -EINVAL;
541
542 if (len > ch->current_packet)
543 len = ch->current_packet;
544
545 r = ch_read(ch, data, len);
546 if (r > 0)
547 ch->notify_other_cpu();
548
549 spin_lock_irqsave(&smd_lock, flags);
550 ch->current_packet -= r;
551 update_packet_state(ch);
552 spin_unlock_irqrestore(&smd_lock, flags);
553
554 return r;
555}
556
557static int smd_alloc_channel(const char *name, uint32_t cid, uint32_t type)
558{
559 struct smd_channel *ch;
560
561 ch = kzalloc(sizeof(struct smd_channel), GFP_KERNEL);
562 if (ch == 0) {
563 pr_err("smd_alloc_channel() out of memory\n");
564 return -1;
565 }
566 ch->n = cid;
567
568 if (_smd_alloc_channel(ch)) {
569 kfree(ch);
570 return -1;
571 }
572
573 ch->fifo_mask = ch->fifo_size - 1;
574 ch->type = type;
575
576 if ((type & SMD_TYPE_MASK) == SMD_TYPE_APPS_MODEM)
577 ch->notify_other_cpu = notify_modem_smd;
578 else
579 ch->notify_other_cpu = notify_dsp_smd;
580
581 if (smd_is_packet(cid, type)) {
582 ch->read = smd_packet_read;
583 ch->write = smd_packet_write;
584 ch->read_avail = smd_packet_read_avail;
585 ch->write_avail = smd_packet_write_avail;
586 ch->update_state = update_packet_state;
587 } else {
588 ch->read = smd_stream_read;
589 ch->write = smd_stream_write;
590 ch->read_avail = smd_stream_read_avail;
591 ch->write_avail = smd_stream_write_avail;
592 ch->update_state = update_stream_state;
593 }
594
595 if ((type & 0xff) == 0)
596 memcpy(ch->name, "SMD_", 4);
597 else
598 memcpy(ch->name, "DSP_", 4);
599 memcpy(ch->name + 4, name, 20);
600 ch->name[23] = 0;
601 ch->pdev.name = ch->name;
602 ch->pdev.id = -1;
603
604 pr_info("smd_alloc_channel() cid=%02d size=%05d '%s'\n",
605 ch->n, ch->fifo_size, ch->name);
606
607 mutex_lock(&smd_creation_mutex);
608 list_add(&ch->ch_list, &smd_ch_closed_list);
609 mutex_unlock(&smd_creation_mutex);
610
611 platform_device_register(&ch->pdev);
612 return 0;
613}
614
615static void smd_channel_probe_worker(struct work_struct *work)
616{
617 struct smd_alloc_elm *shared;
618 unsigned ctype;
619 unsigned type;
620 unsigned n;
621
622 shared = smem_find(ID_CH_ALLOC_TBL, sizeof(*shared) * 64);
623 if (!shared) {
624 pr_err("smd: cannot find allocation table\n");
625 return;
626 }
627 for (n = 0; n < 64; n++) {
628 if (smd_ch_allocated[n])
629 continue;
630 if (!shared[n].ref_count)
631 continue;
632 if (!shared[n].name[0])
633 continue;
634 ctype = shared[n].ctype;
635 type = ctype & SMD_TYPE_MASK;
636
637 /* DAL channels are stream but neither the modem,
638 * nor the DSP correctly indicate this. Fixup manually.
639 */
640 if (!memcmp(shared[n].name, "DAL", 3))
641 ctype = (ctype & (~SMD_KIND_MASK)) | SMD_KIND_STREAM;
642
643 type = shared[n].ctype & SMD_TYPE_MASK;
644 if ((type == SMD_TYPE_APPS_MODEM) ||
645 (type == SMD_TYPE_APPS_DSP))
646 if (!smd_alloc_channel(shared[n].name, shared[n].cid, ctype))
647 smd_ch_allocated[n] = 1;
648 }
649}
650
651static void do_nothing_notify(void *priv, unsigned flags)
652{
653}
654
655struct smd_channel *smd_get_channel(const char *name)
656{
657 struct smd_channel *ch;
658
659 mutex_lock(&smd_creation_mutex);
660 list_for_each_entry(ch, &smd_ch_closed_list, ch_list) {
661 if (!strcmp(name, ch->name)) {
662 list_del(&ch->ch_list);
663 mutex_unlock(&smd_creation_mutex);
664 return ch;
665 }
666 }
667 mutex_unlock(&smd_creation_mutex);
668
669 return NULL;
670}
671
672int smd_open(const char *name, smd_channel_t **_ch,
673 void *priv, void (*notify)(void *, unsigned))
674{
675 struct smd_channel *ch;
676 unsigned long flags;
677
678 if (smd_initialized == 0) {
679 pr_info("smd_open() before smd_init()\n");
680 return -ENODEV;
681 }
682
683 ch = smd_get_channel(name);
684 if (!ch)
685 return -ENODEV;
686
687 if (notify == 0)
688 notify = do_nothing_notify;
689
690 ch->notify = notify;
691 ch->current_packet = 0;
692 ch->last_state = SMD_SS_CLOSED;
693 ch->priv = priv;
694
695 *_ch = ch;
696
697 spin_lock_irqsave(&smd_lock, flags);
698
699 if ((ch->type & SMD_TYPE_MASK) == SMD_TYPE_APPS_MODEM)
700 list_add(&ch->ch_list, &smd_ch_list_modem);
701 else
702 list_add(&ch->ch_list, &smd_ch_list_dsp);
703
704 /* If the remote side is CLOSING, we need to get it to
705 * move to OPENING (which we'll do by moving from CLOSED to
706 * OPENING) and then get it to move from OPENING to
707 * OPENED (by doing the same state change ourselves).
708 *
709 * Otherwise, it should be OPENING and we can move directly
710 * to OPENED so that it will follow.
711 */
712 if (ch->recv->state == SMD_SS_CLOSING) {
713 ch->send->head = 0;
714 ch_set_state(ch, SMD_SS_OPENING);
715 } else {
716 ch_set_state(ch, SMD_SS_OPENED);
717 }
718 spin_unlock_irqrestore(&smd_lock, flags);
719 smd_kick(ch);
720
721 return 0;
722}
723
724int smd_close(smd_channel_t *ch)
725{
726 unsigned long flags;
727
728 pr_info("smd_close(%p)\n", ch);
729
730 if (ch == 0)
731 return -1;
732
733 spin_lock_irqsave(&smd_lock, flags);
734 ch->notify = do_nothing_notify;
735 list_del(&ch->ch_list);
736 ch_set_state(ch, SMD_SS_CLOSED);
737 spin_unlock_irqrestore(&smd_lock, flags);
738
739 mutex_lock(&smd_creation_mutex);
740 list_add(&ch->ch_list, &smd_ch_closed_list);
741 mutex_unlock(&smd_creation_mutex);
742
743 return 0;
744}
745
746int smd_read(smd_channel_t *ch, void *data, int len)
747{
748 return ch->read(ch, data, len);
749}
750
751int smd_write(smd_channel_t *ch, const void *data, int len)
752{
753 return ch->write(ch, data, len);
754}
755
756int smd_write_atomic(smd_channel_t *ch, const void *data, int len)
757{
758 unsigned long flags;
759 int res;
760 spin_lock_irqsave(&smd_lock, flags);
761 res = ch->write(ch, data, len);
762 spin_unlock_irqrestore(&smd_lock, flags);
763 return res;
764}
765
766int smd_read_avail(smd_channel_t *ch)
767{
768 return ch->read_avail(ch);
769}
770
771int smd_write_avail(smd_channel_t *ch)
772{
773 return ch->write_avail(ch);
774}
775
776int smd_wait_until_readable(smd_channel_t *ch, int bytes)
777{
778 return -1;
779}
780
781int smd_wait_until_writable(smd_channel_t *ch, int bytes)
782{
783 return -1;
784}
785
786int smd_cur_packet_size(smd_channel_t *ch)
787{
788 return ch->current_packet;
789}
790
791
792/* ------------------------------------------------------------------------- */
793
794void *smem_alloc(unsigned id, unsigned size)
795{
796 return smem_find(id, size);
797}
798
799void *smem_item(unsigned id, unsigned *size)
800{
801 struct smem_shared *shared = (void *) MSM_SHARED_RAM_BASE;
802 struct smem_heap_entry *toc = shared->heap_toc;
803
804 if (id >= SMEM_NUM_ITEMS)
805 return 0;
806
807 if (toc[id].allocated) {
808 *size = toc[id].size;
809 return (void *) (MSM_SHARED_RAM_BASE + toc[id].offset);
810 } else {
811 *size = 0;
812 }
813
814 return 0;
815}
816
817void *smem_find(unsigned id, unsigned size_in)
818{
819 unsigned size;
820 void *ptr;
821
822 ptr = smem_item(id, &size);
823 if (!ptr)
824 return 0;
825
826 size_in = ALIGN(size_in, 8);
827 if (size_in != size) {
828 pr_err("smem_find(%d, %d): wrong size %d\n",
829 id, size_in, size);
830 return 0;
831 }
832
833 return ptr;
834}
835
836static irqreturn_t smsm_irq_handler(int irq, void *data)
837{
838 unsigned long flags;
839 unsigned apps, modm;
840
841 spin_lock_irqsave(&smem_lock, flags);
842
843 apps = raw_smsm_get_state(SMSM_STATE_APPS);
844 modm = raw_smsm_get_state(SMSM_STATE_MODEM);
845
846 if (msm_smd_debug_mask & MSM_SMSM_DEBUG)
847 pr_info("<SM %08x %08x>\n", apps, modm);
848 if (modm & SMSM_RESET)
849 handle_modem_crash();
850
851 do_smd_probe();
852
853 spin_unlock_irqrestore(&smem_lock, flags);
854 return IRQ_HANDLED;
855}
856
857int smsm_change_state(enum smsm_state_item item,
858 uint32_t clear_mask, uint32_t set_mask)
859{
860 unsigned long addr = smd_info.state + item * 4;
861 unsigned long flags;
862 unsigned state;
863
864 if (!smd_info.ready)
865 return -EIO;
866
867 spin_lock_irqsave(&smem_lock, flags);
868
869 if (raw_smsm_get_state(SMSM_STATE_MODEM) & SMSM_RESET)
870 handle_modem_crash();
871
872 state = (readl(addr) & ~clear_mask) | set_mask;
873 writel(state, addr);
874
875 if (msm_smd_debug_mask & MSM_SMSM_DEBUG)
876 pr_info("smsm_change_state %d %x\n", item, state);
877 notify_other_smsm();
878
879 spin_unlock_irqrestore(&smem_lock, flags);
880
881 return 0;
882}
883
884uint32_t smsm_get_state(enum smsm_state_item item)
885{
886 unsigned long flags;
887 uint32_t rv;
888
889 spin_lock_irqsave(&smem_lock, flags);
890
891 rv = readl(smd_info.state + item * 4);
892
893 if (item == SMSM_STATE_MODEM && (rv & SMSM_RESET))
894 handle_modem_crash();
895
896 spin_unlock_irqrestore(&smem_lock, flags);
897
898 return rv;
899}
900
901#ifdef CONFIG_ARCH_MSM_SCORPION
902
903int smsm_set_sleep_duration(uint32_t delay)
904{
905 struct msm_dem_slave_data *ptr;
906
907 ptr = smem_find(SMEM_APPS_DEM_SLAVE_DATA, sizeof(*ptr));
908 if (ptr == NULL) {
909 pr_err("smsm_set_sleep_duration <SM NO APPS_DEM_SLAVE_DATA>\n");
910 return -EIO;
911 }
912 if (msm_smd_debug_mask & MSM_SMSM_DEBUG)
913 pr_info("smsm_set_sleep_duration %d -> %d\n",
914 ptr->sleep_time, delay);
915 ptr->sleep_time = delay;
916 return 0;
917}
918
919#else
920
921int smsm_set_sleep_duration(uint32_t delay)
922{
923 uint32_t *ptr;
924
925 ptr = smem_find(SMEM_SMSM_SLEEP_DELAY, sizeof(*ptr));
926 if (ptr == NULL) {
927 pr_err("smsm_set_sleep_duration <SM NO SLEEP_DELAY>\n");
928 return -EIO;
929 }
930 if (msm_smd_debug_mask & MSM_SMSM_DEBUG)
931 pr_info("smsm_set_sleep_duration %d -> %d\n",
932 *ptr, delay);
933 *ptr = delay;
934 return 0;
935}
936
937#endif
938
939int smd_core_init(void)
940{
941 int r;
942 pr_info("smd_core_init()\n");
943
944 /* wait for essential items to be initialized */
945 for (;;) {
946 unsigned size;
947 void *state;
948 state = smem_item(SMEM_SMSM_SHARED_STATE, &size);
949 if (size == SMSM_V1_SIZE || size == SMSM_V2_SIZE) {
950 smd_info.state = (unsigned)state;
951 break;
952 }
953 }
954
955 smd_info.ready = 1;
956
957 r = request_irq(INT_A9_M2A_0, smd_modem_irq_handler,
958 IRQF_TRIGGER_RISING, "smd_dev", 0);
959 if (r < 0)
960 return r;
961 r = enable_irq_wake(INT_A9_M2A_0);
962 if (r < 0)
963 pr_err("smd_core_init: enable_irq_wake failed for A9_M2A_0\n");
964
965 r = request_irq(INT_A9_M2A_5, smsm_irq_handler,
966 IRQF_TRIGGER_RISING, "smsm_dev", 0);
967 if (r < 0) {
968 free_irq(INT_A9_M2A_0, 0);
969 return r;
970 }
971 r = enable_irq_wake(INT_A9_M2A_5);
972 if (r < 0)
973 pr_err("smd_core_init: enable_irq_wake failed for A9_M2A_5\n");
974
975#if defined(CONFIG_QDSP6)
976 r = request_irq(INT_ADSP_A11, smd_dsp_irq_handler,
977 IRQF_TRIGGER_RISING, "smd_dsp", 0);
978 if (r < 0) {
979 free_irq(INT_A9_M2A_0, 0);
980 free_irq(INT_A9_M2A_5, 0);
981 return r;
982 }
983#endif
984
985 /* check for any SMD channels that may already exist */
986 do_smd_probe();
987
988 /* indicate that we're up and running */
989 smsm_change_state(SMSM_STATE_APPS,
990 ~0, SMSM_INIT | SMSM_SMDINIT | SMSM_RPCINIT | SMSM_RUN);
991#ifdef CONFIG_ARCH_MSM_SCORPION
992 smsm_change_state(SMSM_STATE_APPS_DEM, ~0, 0);
993#endif
994
995 pr_info("smd_core_init() done\n");
996
997 return 0;
998}
999
1000static int __init msm_smd_probe(struct platform_device *pdev)
1001{
1002 pr_info("smd_init()\n");
1003
1004 /*
1005 * If we haven't waited for the ARM9 to boot up till now,
1006 * then we need to wait here. Otherwise this should just
1007 * return immediately.
1008 */
1009 proc_comm_boot_wait();
1010
1011 INIT_WORK(&probe_work, smd_channel_probe_worker);
1012
1013 if (smd_core_init()) {
1014 pr_err("smd_core_init() failed\n");
1015 return -1;
1016 }
1017
1018 do_smd_probe();
1019
1020 msm_check_for_modem_crash = check_for_modem_crash;
1021
1022 msm_init_last_radio_log(THIS_MODULE);
1023
1024 smd_initialized = 1;
1025
1026 return 0;
1027}
1028
1029static struct platform_driver msm_smd_driver = {
1030 .probe = msm_smd_probe,
1031 .driver = {
1032 .name = MODULE_NAME,
1033 .owner = THIS_MODULE,
1034 },
1035};
1036
1037static int __init msm_smd_init(void)
1038{
1039 return platform_driver_register(&msm_smd_driver);
1040}
1041
1042module_init(msm_smd_init);
1043
1044MODULE_DESCRIPTION("MSM Shared Memory Core");
1045MODULE_AUTHOR("Brian Swetland <swetland@google.com>");
1046MODULE_LICENSE("GPL");
generated by cgit v1.2.2 (git 2.25.0) at 2025-02-25 00:05:56 -0500