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 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
18
19 #include <linux/platform_device.h>
20 #include <linux/module.h>
21 #include <linux/fs.h>
22 #include <linux/cdev.h>
23 #include <linux/device.h>
24 #include <linux/wait.h>
25 #include <linux/interrupt.h>
26 #include <linux/irq.h>
27 #include <linux/list.h>
28 #include <linux/slab.h>
29 #include <linux/debugfs.h>
30 #include <linux/delay.h>
31
32 #include <mach/msm_smd.h>
33
34 #include "smd_private.h"
35 #include "proc_comm.h"
36
37 #if defined(CONFIG_ARCH_QSD8X50)
38 #define CONFIG_QDSP6 1
39 #endif
40
41 #define MODULE_NAME "msm_smd"
42
43 enum {
44 MSM_SMD_DEBUG = 1U << 0,
45 MSM_SMSM_DEBUG = 1U << 0,
46 };
47
48 static int msm_smd_debug_mask;
49
50 struct shared_info {
51 int ready;
52 void __iomem *state;
53 };
54
55 static unsigned dummy_state[SMSM_STATE_COUNT];
56
57 static struct shared_info smd_info = {
58 /* FIXME: not a real __iomem pointer */
59 .state = &dummy_state,
60 };
61
62 module_param_named(debug_mask, msm_smd_debug_mask,
63 int, S_IRUGO | S_IWUSR | S_IWGRP);
64
65 static unsigned last_heap_free = 0xffffffff;
66
67 static 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
75 static inline void notify_modem_smd(void)
76 {
77 msm_a2m_int(0);
78 }
79
80 static inline void notify_dsp_smd(void)
81 {
82 msm_a2m_int(8);
83 }
84
85 static 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_debug("DIAG '%s'\n", x);
93 }
94 }
95
96 /* call when SMSM_RESET flag is set in the A9's smsm_state */
97 static void handle_modem_crash(void)
98 {
99 pr_err("ARM9 has CRASHED\n");
100 smd_diag();
101
102 /* in this case the modem or watchdog should reboot us */
103 for (;;)
104 ;
105 }
106
107 uint32_t raw_smsm_get_state(enum smsm_state_item item)
108 {
109 return readl(smd_info.state + item * 4);
110 }
111
112 static int check_for_modem_crash(void)
113 {
114 if (raw_smsm_get_state(SMSM_STATE_MODEM) & SMSM_RESET) {
115 handle_modem_crash();
116 return -1;
117 }
118 return 0;
119 }
120
121 /* the spinlock is used to synchronize between the
122 * irq handler and code that mutates the channel
123 * list or fiddles with channel state
124 */
125 DEFINE_SPINLOCK(smd_lock);
126 DEFINE_SPINLOCK(smem_lock);
127
128 /* the mutex is used during open() and close()
129 * operations to avoid races while creating or
130 * destroying smd_channel structures
131 */
132 static DEFINE_MUTEX(smd_creation_mutex);
133
134 static int smd_initialized;
135
136 LIST_HEAD(smd_ch_closed_list);
137 LIST_HEAD(smd_ch_list_modem);
138 LIST_HEAD(smd_ch_list_dsp);
139
140 static unsigned char smd_ch_allocated[64];
141 static struct work_struct probe_work;
142
143 /* how many bytes are available for reading */
144 static int smd_stream_read_avail(struct smd_channel *ch)
145 {
146 return (ch->recv->head - ch->recv->tail) & ch->fifo_mask;
147 }
148
149 /* how many bytes we are free to write */
150 static int smd_stream_write_avail(struct smd_channel *ch)
151 {
152 return ch->fifo_mask -
153 ((ch->send->head - ch->send->tail) & ch->fifo_mask);
154 }
155
156 static int smd_packet_read_avail(struct smd_channel *ch)
157 {
158 if (ch->current_packet) {
159 int n = smd_stream_read_avail(ch);
160 if (n > ch->current_packet)
161 n = ch->current_packet;
162 return n;
163 } else {
164 return 0;
165 }
166 }
167
168 static int smd_packet_write_avail(struct smd_channel *ch)
169 {
170 int n = smd_stream_write_avail(ch);
171 return n > SMD_HEADER_SIZE ? n - SMD_HEADER_SIZE : 0;
172 }
173
174 static int ch_is_open(struct smd_channel *ch)
175 {
176 return (ch->recv->state == SMD_SS_OPENED) &&
177 (ch->send->state == SMD_SS_OPENED);
178 }
179
180 /* provide a pointer and length to readable data in the fifo */
181 static unsigned ch_read_buffer(struct smd_channel *ch, void **ptr)
182 {
183 unsigned head = ch->recv->head;
184 unsigned tail = ch->recv->tail;
185 *ptr = (void *) (ch->recv_data + tail);
186
187 if (tail <= head)
188 return head - tail;
189 else
190 return ch->fifo_size - tail;
191 }
192
193 /* advance the fifo read pointer after data from ch_read_buffer is consumed */
194 static void ch_read_done(struct smd_channel *ch, unsigned count)
195 {
196 BUG_ON(count > smd_stream_read_avail(ch));
197 ch->recv->tail = (ch->recv->tail + count) & ch->fifo_mask;
198 ch->send->fTAIL = 1;
199 }
200
201 /* basic read interface to ch_read_{buffer,done} used
202 * by smd_*_read() and update_packet_state()
203 * will read-and-discard if the _data pointer is null
204 */
205 static int ch_read(struct smd_channel *ch, void *_data, int len)
206 {
207 void *ptr;
208 unsigned n;
209 unsigned char *data = _data;
210 int orig_len = len;
211
212 while (len > 0) {
213 n = ch_read_buffer(ch, &ptr);
214 if (n == 0)
215 break;
216
217 if (n > len)
218 n = len;
219 if (_data)
220 memcpy(data, ptr, n);
221
222 data += n;
223 len -= n;
224 ch_read_done(ch, n);
225 }
226
227 return orig_len - len;
228 }
229
230 static void update_stream_state(struct smd_channel *ch)
231 {
232 /* streams have no special state requiring updating */
233 }
234
235 static void update_packet_state(struct smd_channel *ch)
236 {
237 unsigned hdr[5];
238 int r;
239
240 /* can't do anything if we're in the middle of a packet */
241 if (ch->current_packet != 0)
242 return;
243
244 /* don't bother unless we can get the full header */
245 if (smd_stream_read_avail(ch) < SMD_HEADER_SIZE)
246 return;
247
248 r = ch_read(ch, hdr, SMD_HEADER_SIZE);
249 BUG_ON(r != SMD_HEADER_SIZE);
250
251 ch->current_packet = hdr[0];
252 }
253
254 /* provide a pointer and length to next free space in the fifo */
255 static unsigned ch_write_buffer(struct smd_channel *ch, void **ptr)
256 {
257 unsigned head = ch->send->head;
258 unsigned tail = ch->send->tail;
259 *ptr = (void *) (ch->send_data + head);
260
261 if (head < tail) {
262 return tail - head - 1;
263 } else {
264 if (tail == 0)
265 return ch->fifo_size - head - 1;
266 else
267 return ch->fifo_size - head;
268 }
269 }
270
271 /* advace the fifo write pointer after freespace
272 * from ch_write_buffer is filled
273 */
274 static void ch_write_done(struct smd_channel *ch, unsigned count)
275 {
276 BUG_ON(count > smd_stream_write_avail(ch));
277 ch->send->head = (ch->send->head + count) & ch->fifo_mask;
278 ch->send->fHEAD = 1;
279 }
280
281 static void ch_set_state(struct smd_channel *ch, unsigned n)
282 {
283 if (n == SMD_SS_OPENED) {
284 ch->send->fDSR = 1;
285 ch->send->fCTS = 1;
286 ch->send->fCD = 1;
287 } else {
288 ch->send->fDSR = 0;
289 ch->send->fCTS = 0;
290 ch->send->fCD = 0;
291 }
292 ch->send->state = n;
293 ch->send->fSTATE = 1;
294 ch->notify_other_cpu();
295 }
296
297 static void do_smd_probe(void)
298 {
299 struct smem_shared *shared = (void *) MSM_SHARED_RAM_BASE;
300 if (shared->heap_info.free_offset != last_heap_free) {
301 last_heap_free = shared->heap_info.free_offset;
302 schedule_work(&probe_work);
303 }
304 }
305
306 static void smd_state_change(struct smd_channel *ch,
307 unsigned last, unsigned next)
308 {
309 ch->last_state = next;
310
311 pr_debug("ch %d %d -> %d\n", ch->n, last, next);
312
313 switch (next) {
314 case SMD_SS_OPENING:
315 ch->recv->tail = 0;
316 case SMD_SS_OPENED:
317 if (ch->send->state != SMD_SS_OPENED)
318 ch_set_state(ch, SMD_SS_OPENED);
319 ch->notify(ch->priv, SMD_EVENT_OPEN);
320 break;
321 case SMD_SS_FLUSHING:
322 case SMD_SS_RESET:
323 /* we should force them to close? */
324 default:
325 ch->notify(ch->priv, SMD_EVENT_CLOSE);
326 }
327 }
328
329 static void handle_smd_irq(struct list_head *list, void (*notify)(void))
330 {
331 unsigned long flags;
332 struct smd_channel *ch;
333 int do_notify = 0;
334 unsigned ch_flags;
335 unsigned tmp;
336
337 spin_lock_irqsave(&smd_lock, flags);
338 list_for_each_entry(ch, list, ch_list) {
339 ch_flags = 0;
340 if (ch_is_open(ch)) {
341 if (ch->recv->fHEAD) {
342 ch->recv->fHEAD = 0;
343 ch_flags |= 1;
344 do_notify |= 1;
345 }
346 if (ch->recv->fTAIL) {
347 ch->recv->fTAIL = 0;
348 ch_flags |= 2;
349 do_notify |= 1;
350 }
351 if (ch->recv->fSTATE) {
352 ch->recv->fSTATE = 0;
353 ch_flags |= 4;
354 do_notify |= 1;
355 }
356 }
357 tmp = ch->recv->state;
358 if (tmp != ch->last_state)
359 smd_state_change(ch, ch->last_state, tmp);
360 if (ch_flags) {
361 ch->update_state(ch);
362 ch->notify(ch->priv, SMD_EVENT_DATA);
363 }
364 }
365 if (do_notify)
366 notify();
367 spin_unlock_irqrestore(&smd_lock, flags);
368 do_smd_probe();
369 }
370
371 static irqreturn_t smd_modem_irq_handler(int irq, void *data)
372 {
373 handle_smd_irq(&smd_ch_list_modem, notify_modem_smd);
374 return IRQ_HANDLED;
375 }
376
377 #if defined(CONFIG_QDSP6)
378 static irqreturn_t smd_dsp_irq_handler(int irq, void *data)
379 {
380 handle_smd_irq(&smd_ch_list_dsp, notify_dsp_smd);
381 return IRQ_HANDLED;
382 }
383 #endif
384
385 static void smd_fake_irq_handler(unsigned long arg)
386 {
387 handle_smd_irq(&smd_ch_list_modem, notify_modem_smd);
388 handle_smd_irq(&smd_ch_list_dsp, notify_dsp_smd);
389 }
390
391 static DECLARE_TASKLET(smd_fake_irq_tasklet, smd_fake_irq_handler, 0);
392
393 static inline int smd_need_int(struct smd_channel *ch)
394 {
395 if (ch_is_open(ch)) {
396 if (ch->recv->fHEAD || ch->recv->fTAIL || ch->recv->fSTATE)
397 return 1;
398 if (ch->recv->state != ch->last_state)
399 return 1;
400 }
401 return 0;
402 }
403
404 void smd_sleep_exit(void)
405 {
406 unsigned long flags;
407 struct smd_channel *ch;
408 int need_int = 0;
409
410 spin_lock_irqsave(&smd_lock, flags);
411 list_for_each_entry(ch, &smd_ch_list_modem, ch_list) {
412 if (smd_need_int(ch)) {
413 need_int = 1;
414 break;
415 }
416 }
417 list_for_each_entry(ch, &smd_ch_list_dsp, ch_list) {
418 if (smd_need_int(ch)) {
419 need_int = 1;
420 break;
421 }
422 }
423 spin_unlock_irqrestore(&smd_lock, flags);
424 do_smd_probe();
425
426 if (need_int) {
427 if (msm_smd_debug_mask & MSM_SMD_DEBUG)
428 pr_info("smd_sleep_exit need interrupt\n");
429 tasklet_schedule(&smd_fake_irq_tasklet);
430 }
431 }
432
433
434 void smd_kick(smd_channel_t *ch)
435 {
436 unsigned long flags;
437 unsigned tmp;
438
439 spin_lock_irqsave(&smd_lock, flags);
440 ch->update_state(ch);
441 tmp = ch->recv->state;
442 if (tmp != ch->last_state) {
443 ch->last_state = tmp;
444 if (tmp == SMD_SS_OPENED)
445 ch->notify(ch->priv, SMD_EVENT_OPEN);
446 else
447 ch->notify(ch->priv, SMD_EVENT_CLOSE);
448 }
449 ch->notify(ch->priv, SMD_EVENT_DATA);
450 ch->notify_other_cpu();
451 spin_unlock_irqrestore(&smd_lock, flags);
452 }
453
454 static int smd_is_packet(int chn, unsigned type)
455 {
456 type &= SMD_KIND_MASK;
457 if (type == SMD_KIND_PACKET)
458 return 1;
459 if (type == SMD_KIND_STREAM)
460 return 0;
461
462 /* older AMSS reports SMD_KIND_UNKNOWN always */
463 if ((chn > 4) || (chn == 1))
464 return 1;
465 else
466 return 0;
467 }
468
469 static int smd_stream_write(smd_channel_t *ch, const void *_data, int len)
470 {
471 void *ptr;
472 const unsigned char *buf = _data;
473 unsigned xfer;
474 int orig_len = len;
475
476 if (len < 0)
477 return -EINVAL;
478
479 while ((xfer = ch_write_buffer(ch, &ptr)) != 0) {
480 if (!ch_is_open(ch))
481 break;
482 if (xfer > len)
483 xfer = len;
484 memcpy(ptr, buf, xfer);
485 ch_write_done(ch, xfer);
486 len -= xfer;
487 buf += xfer;
488 if (len == 0)
489 break;
490 }
491
492 ch->notify_other_cpu();
493
494 return orig_len - len;
495 }
496
497 static int smd_packet_write(smd_channel_t *ch, const void *_data, int len)
498 {
499 unsigned hdr[5];
500
501 if (len < 0)
502 return -EINVAL;
503
504 if (smd_stream_write_avail(ch) < (len + SMD_HEADER_SIZE))
505 return -ENOMEM;
506
507 hdr[0] = len;
508 hdr[1] = hdr[2] = hdr[3] = hdr[4] = 0;
509
510 smd_stream_write(ch, hdr, sizeof(hdr));
511 smd_stream_write(ch, _data, len);
512
513 return len;
514 }
515
516 static int smd_stream_read(smd_channel_t *ch, void *data, int len)
517 {
518 int r;
519
520 if (len < 0)
521 return -EINVAL;
522
523 r = ch_read(ch, data, len);
524 if (r > 0)
525 ch->notify_other_cpu();
526
527 return r;
528 }
529
530 static int smd_packet_read(smd_channel_t *ch, void *data, int len)
531 {
532 unsigned long flags;
533 int r;
534
535 if (len < 0)
536 return -EINVAL;
537
538 if (len > ch->current_packet)
539 len = ch->current_packet;
540
541 r = ch_read(ch, data, len);
542 if (r > 0)
543 ch->notify_other_cpu();
544
545 spin_lock_irqsave(&smd_lock, flags);
546 ch->current_packet -= r;
547 update_packet_state(ch);
548 spin_unlock_irqrestore(&smd_lock, flags);
549
550 return r;
551 }
552
553 static int smd_alloc_channel(const char *name, uint32_t cid, uint32_t type)
554 {
555 struct smd_channel *ch;
556
557 ch = kzalloc(sizeof(struct smd_channel), GFP_KERNEL);
558 if (ch == 0) {
559 pr_err("smd_alloc_channel() out of memory\n");
560 return -1;
561 }
562 ch->n = cid;
563
564 if (_smd_alloc_channel(ch)) {
565 kfree(ch);
566 return -1;
567 }
568
569 ch->fifo_mask = ch->fifo_size - 1;
570 ch->type = type;
571
572 if ((type & SMD_TYPE_MASK) == SMD_TYPE_APPS_MODEM)
573 ch->notify_other_cpu = notify_modem_smd;
574 else
575 ch->notify_other_cpu = notify_dsp_smd;
576
577 if (smd_is_packet(cid, type)) {
578 ch->read = smd_packet_read;
579 ch->write = smd_packet_write;
580 ch->read_avail = smd_packet_read_avail;
581 ch->write_avail = smd_packet_write_avail;
582 ch->update_state = update_packet_state;
583 } else {
584 ch->read = smd_stream_read;
585 ch->write = smd_stream_write;
586 ch->read_avail = smd_stream_read_avail;
587 ch->write_avail = smd_stream_write_avail;
588 ch->update_state = update_stream_state;
589 }
590
591 if ((type & 0xff) == 0)
592 memcpy(ch->name, "SMD_", 4);
593 else
594 memcpy(ch->name, "DSP_", 4);
595 memcpy(ch->name + 4, name, 20);
596 ch->name[23] = 0;
597 ch->pdev.name = ch->name;
598 ch->pdev.id = -1;
599
600 pr_debug("smd_alloc_channel() cid=%02d size=%05d '%s'\n",
601 ch->n, ch->fifo_size, ch->name);
602
603 mutex_lock(&smd_creation_mutex);
604 list_add(&ch->ch_list, &smd_ch_closed_list);
605 mutex_unlock(&smd_creation_mutex);
606
607 platform_device_register(&ch->pdev);
608 return 0;
609 }
610
611 static void smd_channel_probe_worker(struct work_struct *work)
612 {
613 struct smd_alloc_elm *shared;
614 unsigned ctype;
615 unsigned type;
616 unsigned n;
617
618 shared = smem_find(ID_CH_ALLOC_TBL, sizeof(*shared) * 64);
619 if (!shared) {
620 pr_err("cannot find allocation table\n");
621 return;
622 }
623 for (n = 0; n < 64; n++) {
624 if (smd_ch_allocated[n])
625 continue;
626 if (!shared[n].ref_count)
627 continue;
628 if (!shared[n].name[0])
629 continue;
630 ctype = shared[n].ctype;
631 type = ctype & SMD_TYPE_MASK;
632
633 /* DAL channels are stream but neither the modem,
634 * nor the DSP correctly indicate this. Fixup manually.
635 */
636 if (!memcmp(shared[n].name, "DAL", 3))
637 ctype = (ctype & (~SMD_KIND_MASK)) | SMD_KIND_STREAM;
638
639 type = shared[n].ctype & SMD_TYPE_MASK;
640 if ((type == SMD_TYPE_APPS_MODEM) ||
641 (type == SMD_TYPE_APPS_DSP))
642 if (!smd_alloc_channel(shared[n].name, shared[n].cid, ctype))
643 smd_ch_allocated[n] = 1;
644 }
645 }
646
647 static void do_nothing_notify(void *priv, unsigned flags)
648 {
649 }
650
651 struct smd_channel *smd_get_channel(const char *name)
652 {
653 struct smd_channel *ch;
654
655 mutex_lock(&smd_creation_mutex);
656 list_for_each_entry(ch, &smd_ch_closed_list, ch_list) {
657 if (!strcmp(name, ch->name)) {
658 list_del(&ch->ch_list);
659 mutex_unlock(&smd_creation_mutex);
660 return ch;
661 }
662 }
663 mutex_unlock(&smd_creation_mutex);
664
665 return NULL;
666 }
667
668 int smd_open(const char *name, smd_channel_t **_ch,
669 void *priv, void (*notify)(void *, unsigned))
670 {
671 struct smd_channel *ch;
672 unsigned long flags;
673
674 if (smd_initialized == 0) {
675 pr_info("smd_open() before smd_init()\n");
676 return -ENODEV;
677 }
678
679 ch = smd_get_channel(name);
680 if (!ch)
681 return -ENODEV;
682
683 if (notify == 0)
684 notify = do_nothing_notify;
685
686 ch->notify = notify;
687 ch->current_packet = 0;
688 ch->last_state = SMD_SS_CLOSED;
689 ch->priv = priv;
690
691 *_ch = ch;
692
693 spin_lock_irqsave(&smd_lock, flags);
694
695 if ((ch->type & SMD_TYPE_MASK) == SMD_TYPE_APPS_MODEM)
696 list_add(&ch->ch_list, &smd_ch_list_modem);
697 else
698 list_add(&ch->ch_list, &smd_ch_list_dsp);
699
700 /* If the remote side is CLOSING, we need to get it to
701 * move to OPENING (which we'll do by moving from CLOSED to
702 * OPENING) and then get it to move from OPENING to
703 * OPENED (by doing the same state change ourselves).
704 *
705 * Otherwise, it should be OPENING and we can move directly
706 * to OPENED so that it will follow.
707 */
708 if (ch->recv->state == SMD_SS_CLOSING) {
709 ch->send->head = 0;
710 ch_set_state(ch, SMD_SS_OPENING);
711 } else {
712 ch_set_state(ch, SMD_SS_OPENED);
713 }
714 spin_unlock_irqrestore(&smd_lock, flags);
715 smd_kick(ch);
716
717 return 0;
718 }
719
720 int smd_close(smd_channel_t *ch)
721 {
722 unsigned long flags;
723
724 if (ch == 0)
725 return -1;
726
727 spin_lock_irqsave(&smd_lock, flags);
728 ch->notify = do_nothing_notify;
729 list_del(&ch->ch_list);
730 ch_set_state(ch, SMD_SS_CLOSED);
731 spin_unlock_irqrestore(&smd_lock, flags);
732
733 mutex_lock(&smd_creation_mutex);
734 list_add(&ch->ch_list, &smd_ch_closed_list);
735 mutex_unlock(&smd_creation_mutex);
736
737 return 0;
738 }
739
740 int smd_read(smd_channel_t *ch, void *data, int len)
741 {
742 return ch->read(ch, data, len);
743 }
744
745 int smd_write(smd_channel_t *ch, const void *data, int len)
746 {
747 return ch->write(ch, data, len);
748 }
749
750 int smd_write_atomic(smd_channel_t *ch, const void *data, int len)
751 {
752 unsigned long flags;
753 int res;
754 spin_lock_irqsave(&smd_lock, flags);
755 res = ch->write(ch, data, len);
756 spin_unlock_irqrestore(&smd_lock, flags);
757 return res;
758 }
759
760 int smd_read_avail(smd_channel_t *ch)
761 {
762 return ch->read_avail(ch);
763 }
764
765 int smd_write_avail(smd_channel_t *ch)
766 {
767 return ch->write_avail(ch);
768 }
769
770 int smd_wait_until_readable(smd_channel_t *ch, int bytes)
771 {
772 return -1;
773 }
774
775 int smd_wait_until_writable(smd_channel_t *ch, int bytes)
776 {
777 return -1;
778 }
779
780 int smd_cur_packet_size(smd_channel_t *ch)
781 {
782 return ch->current_packet;
783 }
784
785
786 /* ------------------------------------------------------------------------- */
787
788 void *smem_alloc(unsigned id, unsigned size)
789 {
790 return smem_find(id, size);
791 }
792
793 void __iomem *smem_item(unsigned id, unsigned *size)
794 {
795 struct smem_shared *shared = (void *) MSM_SHARED_RAM_BASE;
796 struct smem_heap_entry *toc = shared->heap_toc;
797
798 if (id >= SMEM_NUM_ITEMS)
799 return NULL;
800
801 if (toc[id].allocated) {
802 *size = toc[id].size;
803 return (MSM_SHARED_RAM_BASE + toc[id].offset);
804 } else {
805 *size = 0;
806 }
807
808 return NULL;
809 }
810
811 void *smem_find(unsigned id, unsigned size_in)
812 {
813 unsigned size;
814 void *ptr;
815
816 ptr = smem_item(id, &size);
817 if (!ptr)
818 return 0;
819
820 size_in = ALIGN(size_in, 8);
821 if (size_in != size) {
822 pr_err("smem_find(%d, %d): wrong size %d\n",
823 id, size_in, size);
824 return 0;
825 }
826
827 return ptr;
828 }
829
830 static irqreturn_t smsm_irq_handler(int irq, void *data)
831 {
832 unsigned long flags;
833 unsigned apps, modm;
834
835 spin_lock_irqsave(&smem_lock, flags);
836
837 apps = raw_smsm_get_state(SMSM_STATE_APPS);
838 modm = raw_smsm_get_state(SMSM_STATE_MODEM);
839
840 if (msm_smd_debug_mask & MSM_SMSM_DEBUG)
841 pr_info("<SM %08x %08x>\n", apps, modm);
842 if (modm & SMSM_RESET)
843 handle_modem_crash();
844
845 do_smd_probe();
846
847 spin_unlock_irqrestore(&smem_lock, flags);
848 return IRQ_HANDLED;
849 }
850
851 int smsm_change_state(enum smsm_state_item item,
852 uint32_t clear_mask, uint32_t set_mask)
853 {
854 void __iomem *addr = smd_info.state + item * 4;
855 unsigned long flags;
856 unsigned state;
857
858 if (!smd_info.ready)
859 return -EIO;
860
861 spin_lock_irqsave(&smem_lock, flags);
862
863 if (raw_smsm_get_state(SMSM_STATE_MODEM) & SMSM_RESET)
864 handle_modem_crash();
865
866 state = (readl(addr) & ~clear_mask) | set_mask;
867 writel(state, addr);
868
869 if (msm_smd_debug_mask & MSM_SMSM_DEBUG)
870 pr_info("smsm_change_state %d %x\n", item, state);
871 notify_other_smsm();
872
873 spin_unlock_irqrestore(&smem_lock, flags);
874
875 return 0;
876 }
877
878 uint32_t smsm_get_state(enum smsm_state_item item)
879 {
880 unsigned long flags;
881 uint32_t rv;
882
883 spin_lock_irqsave(&smem_lock, flags);
884
885 rv = readl(smd_info.state + item * 4);
886
887 if (item == SMSM_STATE_MODEM && (rv & SMSM_RESET))
888 handle_modem_crash();
889
890 spin_unlock_irqrestore(&smem_lock, flags);
891
892 return rv;
893 }
894
895 #ifdef CONFIG_ARCH_MSM_SCORPION
896
897 int smsm_set_sleep_duration(uint32_t delay)
898 {
899 struct msm_dem_slave_data *ptr;
900
901 ptr = smem_find(SMEM_APPS_DEM_SLAVE_DATA, sizeof(*ptr));
902 if (ptr == NULL) {
903 pr_err("smsm_set_sleep_duration <SM NO APPS_DEM_SLAVE_DATA>\n");
904 return -EIO;
905 }
906 if (msm_smd_debug_mask & MSM_SMSM_DEBUG)
907 pr_info("smsm_set_sleep_duration %d -> %d\n",
908 ptr->sleep_time, delay);
909 ptr->sleep_time = delay;
910 return 0;
911 }
912
913 #else
914
915 int smsm_set_sleep_duration(uint32_t delay)
916 {
917 uint32_t *ptr;
918
919 ptr = smem_find(SMEM_SMSM_SLEEP_DELAY, sizeof(*ptr));
920 if (ptr == NULL) {
921 pr_err("smsm_set_sleep_duration <SM NO SLEEP_DELAY>\n");
922 return -EIO;
923 }
924 if (msm_smd_debug_mask & MSM_SMSM_DEBUG)
925 pr_info("smsm_set_sleep_duration %d -> %d\n",
926 *ptr, delay);
927 *ptr = delay;
928 return 0;
929 }
930
931 #endif
932
933 int smd_core_init(void)
934 {
935 int r;
936
937 /* wait for essential items to be initialized */
938 for (;;) {
939 unsigned size;
940 void __iomem *state;
941 state = smem_item(SMEM_SMSM_SHARED_STATE, &size);
942 if (size == SMSM_V1_SIZE || size == SMSM_V2_SIZE) {
943 smd_info.state = state;
944 break;
945 }
946 }
947
948 smd_info.ready = 1;
949
950 r = request_irq(INT_A9_M2A_0, smd_modem_irq_handler,
951 IRQF_TRIGGER_RISING, "smd_dev", 0);
952 if (r < 0)
953 return r;
954 r = enable_irq_wake(INT_A9_M2A_0);
955 if (r < 0)
956 pr_err("smd_core_init: enable_irq_wake failed for A9_M2A_0\n");
957
958 r = request_irq(INT_A9_M2A_5, smsm_irq_handler,
959 IRQF_TRIGGER_RISING, "smsm_dev", 0);
960 if (r < 0) {
961 free_irq(INT_A9_M2A_0, 0);
962 return r;
963 }
964 r = enable_irq_wake(INT_A9_M2A_5);
965 if (r < 0)
966 pr_err("smd_core_init: enable_irq_wake failed for A9_M2A_5\n");
967
968 #if defined(CONFIG_QDSP6)
969 r = request_irq(INT_ADSP_A11, smd_dsp_irq_handler,
970 IRQF_TRIGGER_RISING, "smd_dsp", 0);
971 if (r < 0) {
972 free_irq(INT_A9_M2A_0, 0);
973 free_irq(INT_A9_M2A_5, 0);
974 return r;
975 }
976 #endif
977
978 /* check for any SMD channels that may already exist */
979 do_smd_probe();
980
981 /* indicate that we're up and running */
982 smsm_change_state(SMSM_STATE_APPS,
983 ~0, SMSM_INIT | SMSM_SMDINIT | SMSM_RPCINIT | SMSM_RUN);
984 #ifdef CONFIG_ARCH_MSM_SCORPION
985 smsm_change_state(SMSM_STATE_APPS_DEM, ~0, 0);
986 #endif
987
988 return 0;
989 }
990
991 static int msm_smd_probe(struct platform_device *pdev)
992 {
993 /*
994 * If we haven't waited for the ARM9 to boot up till now,
995 * then we need to wait here. Otherwise this should just
996 * return immediately.
997 */
998 proc_comm_boot_wait();
999
1000 INIT_WORK(&probe_work, smd_channel_probe_worker);
1001
1002 if (smd_core_init()) {
1003 pr_err("smd_core_init() failed\n");
1004 return -1;
1005 }
1006
1007 do_smd_probe();
1008
1009 msm_check_for_modem_crash = check_for_modem_crash;
1010
1011 msm_init_last_radio_log(THIS_MODULE);
1012
1013 smd_initialized = 1;
1014
1015 return 0;
1016 }
1017
1018 static struct platform_driver msm_smd_driver = {
1019 .probe = msm_smd_probe,
1020 .driver = {
1021 .name = MODULE_NAME,
1022 },
1023 };
1024
1025 static int __init msm_smd_init(void)
1026 {
1027 return platform_driver_register(&msm_smd_driver);
1028 }
1029
1030 module_init(msm_smd_init);
1031
1032 MODULE_DESCRIPTION("MSM Shared Memory Core");
1033 MODULE_AUTHOR("Brian Swetland <swetland@google.com>");
1034 MODULE_LICENSE("GPL");
1035
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