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smd.c
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1 /* arch/arm/mach-msm/smd.c
2  *
3  * Copyright (C) 2007 Google, Inc.
4  * Author: Brian Swetland <[email protected]>
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 
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 
108 {
109  return readl(smd_info.state + item * 4);
110 }
111 
112 static int check_for_modem_crash(void)
113 {
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);
412  if (smd_need_int(ch)) {
413  need_int = 1;
414  break;
415  }
416  }
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 
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 
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);
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;
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 
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 
761 {
762  return ch->read_avail(ch);
763 }
764 
766 {
767  return ch->write_avail(ch);
768 }
769 
771 {
772  return -1;
773 }
774 
776 {
777  return -1;
778 }
779 
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 
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 
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 
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 
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 
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 
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) {
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) {
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 */
984 #ifdef CONFIG_ARCH_MSM_SCORPION
986 #endif
987 
988  return 0;
989 }
990 
991 static int __devinit 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  */
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 
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  .owner = THIS_MODULE,
1023  },
1024 };
1025 
1026 static int __init msm_smd_init(void)
1027 {
1028  return platform_driver_register(&msm_smd_driver);
1029 }
1030 
1031 module_init(msm_smd_init);
1032 
1033 MODULE_DESCRIPTION("MSM Shared Memory Core");
1034 MODULE_AUTHOR("Brian Swetland <[email protected]>");
1035 MODULE_LICENSE("GPL");