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TOMOYO Linux Cross Reference
Linux/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 #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 #include <mach/system.h>
 34 
 35 #include "smd_private.h"
 36 #include "proc_comm.h"
 37 
 38 #if defined(CONFIG_ARCH_QSD8X50)
 39 #define CONFIG_QDSP6 1
 40 #endif
 41 
 42 void (*msm_hw_reset_hook)(void);
 43 
 44 #define MODULE_NAME "msm_smd"
 45 
 46 enum {
 47         MSM_SMD_DEBUG = 1U << 0,
 48         MSM_SMSM_DEBUG = 1U << 0,
 49 };
 50 
 51 static int msm_smd_debug_mask;
 52 
 53 struct shared_info {
 54         int ready;
 55         unsigned state;
 56 };
 57 
 58 static unsigned dummy_state[SMSM_STATE_COUNT];
 59 
 60 static struct shared_info smd_info = {
 61         .state = (unsigned) &dummy_state,
 62 };
 63 
 64 module_param_named(debug_mask, msm_smd_debug_mask,
 65                    int, S_IRUGO | S_IWUSR | S_IWGRP);
 66 
 67 static unsigned last_heap_free = 0xffffffff;
 68 
 69 static inline void notify_other_smsm(void)
 70 {
 71         msm_a2m_int(5);
 72 #ifdef CONFIG_QDSP6
 73         msm_a2m_int(8);
 74 #endif
 75 }
 76 
 77 static inline void notify_modem_smd(void)
 78 {
 79         msm_a2m_int(0);
 80 }
 81 
 82 static inline void notify_dsp_smd(void)
 83 {
 84         msm_a2m_int(8);
 85 }
 86 
 87 static void smd_diag(void)
 88 {
 89         char *x;
 90 
 91         x = smem_find(ID_DIAG_ERR_MSG, SZ_DIAG_ERR_MSG);
 92         if (x != 0) {
 93                 x[SZ_DIAG_ERR_MSG - 1] = 0;
 94                 pr_debug("DIAG '%s'\n", x);
 95         }
 96 }
 97 
 98 /* call when SMSM_RESET flag is set in the A9's smsm_state */
 99 static void handle_modem_crash(void)
100 {
101         pr_err("ARM9 has CRASHED\n");
102         smd_diag();
103 
104         /* hard reboot if possible */
105         if (msm_hw_reset_hook)
106                 msm_hw_reset_hook();
107 
108         /* in this case the modem or watchdog should reboot us */
109         for (;;)
110                 ;
111 }
112 
113 uint32_t raw_smsm_get_state(enum smsm_state_item item)
114 {
115         return readl(smd_info.state + item * 4);
116 }
117 
118 static int check_for_modem_crash(void)
119 {
120         if (raw_smsm_get_state(SMSM_STATE_MODEM) & SMSM_RESET) {
121                 handle_modem_crash();
122                 return -1;
123         }
124         return 0;
125 }
126 
127 /* the spinlock is used to synchronize between the
128  * irq handler and code that mutates the channel
129  * list or fiddles with channel state
130  */
131 DEFINE_SPINLOCK(smd_lock);
132 DEFINE_SPINLOCK(smem_lock);
133 
134 /* the mutex is used during open() and close()
135  * operations to avoid races while creating or
136  * destroying smd_channel structures
137  */
138 static DEFINE_MUTEX(smd_creation_mutex);
139 
140 static int smd_initialized;
141 
142 LIST_HEAD(smd_ch_closed_list);
143 LIST_HEAD(smd_ch_list_modem);
144 LIST_HEAD(smd_ch_list_dsp);
145 
146 static unsigned char smd_ch_allocated[64];
147 static struct work_struct probe_work;
148 
149 /* how many bytes are available for reading */
150 static int smd_stream_read_avail(struct smd_channel *ch)
151 {
152         return (ch->recv->head - ch->recv->tail) & ch->fifo_mask;
153 }
154 
155 /* how many bytes we are free to write */
156 static int smd_stream_write_avail(struct smd_channel *ch)
157 {
158         return ch->fifo_mask -
159                 ((ch->send->head - ch->send->tail) & ch->fifo_mask);
160 }
161 
162 static int smd_packet_read_avail(struct smd_channel *ch)
163 {
164         if (ch->current_packet) {
165                 int n = smd_stream_read_avail(ch);
166                 if (n > ch->current_packet)
167                         n = ch->current_packet;
168                 return n;
169         } else {
170                 return 0;
171         }
172 }
173 
174 static int smd_packet_write_avail(struct smd_channel *ch)
175 {
176         int n = smd_stream_write_avail(ch);
177         return n > SMD_HEADER_SIZE ? n - SMD_HEADER_SIZE : 0;
178 }
179 
180 static int ch_is_open(struct smd_channel *ch)
181 {
182         return (ch->recv->state == SMD_SS_OPENED) &&
183                 (ch->send->state == SMD_SS_OPENED);
184 }
185 
186 /* provide a pointer and length to readable data in the fifo */
187 static unsigned ch_read_buffer(struct smd_channel *ch, void **ptr)
188 {
189         unsigned head = ch->recv->head;
190         unsigned tail = ch->recv->tail;
191         *ptr = (void *) (ch->recv_data + tail);
192 
193         if (tail <= head)
194                 return head - tail;
195         else
196                 return ch->fifo_size - tail;
197 }
198 
199 /* advance the fifo read pointer after data from ch_read_buffer is consumed */
200 static void ch_read_done(struct smd_channel *ch, unsigned count)
201 {
202         BUG_ON(count > smd_stream_read_avail(ch));
203         ch->recv->tail = (ch->recv->tail + count) & ch->fifo_mask;
204         ch->send->fTAIL = 1;
205 }
206 
207 /* basic read interface to ch_read_{buffer,done} used
208  * by smd_*_read() and update_packet_state()
209  * will read-and-discard if the _data pointer is null
210  */
211 static int ch_read(struct smd_channel *ch, void *_data, int len)
212 {
213         void *ptr;
214         unsigned n;
215         unsigned char *data = _data;
216         int orig_len = len;
217 
218         while (len > 0) {
219                 n = ch_read_buffer(ch, &ptr);
220                 if (n == 0)
221                         break;
222 
223                 if (n > len)
224                         n = len;
225                 if (_data)
226                         memcpy(data, ptr, n);
227 
228                 data += n;
229                 len -= n;
230                 ch_read_done(ch, n);
231         }
232 
233         return orig_len - len;
234 }
235 
236 static void update_stream_state(struct smd_channel *ch)
237 {
238         /* streams have no special state requiring updating */
239 }
240 
241 static void update_packet_state(struct smd_channel *ch)
242 {
243         unsigned hdr[5];
244         int r;
245 
246         /* can't do anything if we're in the middle of a packet */
247         if (ch->current_packet != 0)
248                 return;
249 
250         /* don't bother unless we can get the full header */
251         if (smd_stream_read_avail(ch) < SMD_HEADER_SIZE)
252                 return;
253 
254         r = ch_read(ch, hdr, SMD_HEADER_SIZE);
255         BUG_ON(r != SMD_HEADER_SIZE);
256 
257         ch->current_packet = hdr[0];
258 }
259 
260 /* provide a pointer and length to next free space in the fifo */
261 static unsigned ch_write_buffer(struct smd_channel *ch, void **ptr)
262 {
263         unsigned head = ch->send->head;
264         unsigned tail = ch->send->tail;
265         *ptr = (void *) (ch->send_data + head);
266 
267         if (head < tail) {
268                 return tail - head - 1;
269         } else {
270                 if (tail == 0)
271                         return ch->fifo_size - head - 1;
272                 else
273                         return ch->fifo_size - head;
274         }
275 }
276 
277 /* advace the fifo write pointer after freespace
278  * from ch_write_buffer is filled
279  */
280 static void ch_write_done(struct smd_channel *ch, unsigned count)
281 {
282         BUG_ON(count > smd_stream_write_avail(ch));
283         ch->send->head = (ch->send->head + count) & ch->fifo_mask;
284         ch->send->fHEAD = 1;
285 }
286 
287 static void ch_set_state(struct smd_channel *ch, unsigned n)
288 {
289         if (n == SMD_SS_OPENED) {
290                 ch->send->fDSR = 1;
291                 ch->send->fCTS = 1;
292                 ch->send->fCD = 1;
293         } else {
294                 ch->send->fDSR = 0;
295                 ch->send->fCTS = 0;
296                 ch->send->fCD = 0;
297         }
298         ch->send->state = n;
299         ch->send->fSTATE = 1;
300         ch->notify_other_cpu();
301 }
302 
303 static void do_smd_probe(void)
304 {
305         struct smem_shared *shared = (void *) MSM_SHARED_RAM_BASE;
306         if (shared->heap_info.free_offset != last_heap_free) {
307                 last_heap_free = shared->heap_info.free_offset;
308                 schedule_work(&probe_work);
309         }
310 }
311 
312 static void smd_state_change(struct smd_channel *ch,
313                              unsigned last, unsigned next)
314 {
315         ch->last_state = next;
316 
317         pr_debug("ch %d %d -> %d\n", ch->n, last, next);
318 
319         switch (next) {
320         case SMD_SS_OPENING:
321                 ch->recv->tail = 0;
322         case SMD_SS_OPENED:
323                 if (ch->send->state != SMD_SS_OPENED)
324                         ch_set_state(ch, SMD_SS_OPENED);
325                 ch->notify(ch->priv, SMD_EVENT_OPEN);
326                 break;
327         case SMD_SS_FLUSHING:
328         case SMD_SS_RESET:
329                 /* we should force them to close? */
330         default:
331                 ch->notify(ch->priv, SMD_EVENT_CLOSE);
332         }
333 }
334 
335 static void handle_smd_irq(struct list_head *list, void (*notify)(void))
336 {
337         unsigned long flags;
338         struct smd_channel *ch;
339         int do_notify = 0;
340         unsigned ch_flags;
341         unsigned tmp;
342 
343         spin_lock_irqsave(&smd_lock, flags);
344         list_for_each_entry(ch, list, ch_list) {
345                 ch_flags = 0;
346                 if (ch_is_open(ch)) {
347                         if (ch->recv->fHEAD) {
348                                 ch->recv->fHEAD = 0;
349                                 ch_flags |= 1;
350                                 do_notify |= 1;
351                         }
352                         if (ch->recv->fTAIL) {
353                                 ch->recv->fTAIL = 0;
354                                 ch_flags |= 2;
355                                 do_notify |= 1;
356                         }
357                         if (ch->recv->fSTATE) {
358                                 ch->recv->fSTATE = 0;
359                                 ch_flags |= 4;
360                                 do_notify |= 1;
361                         }
362                 }
363                 tmp = ch->recv->state;
364                 if (tmp != ch->last_state)
365                         smd_state_change(ch, ch->last_state, tmp);
366                 if (ch_flags) {
367                         ch->update_state(ch);
368                         ch->notify(ch->priv, SMD_EVENT_DATA);
369                 }
370         }
371         if (do_notify)
372                 notify();
373         spin_unlock_irqrestore(&smd_lock, flags);
374         do_smd_probe();
375 }
376 
377 static irqreturn_t smd_modem_irq_handler(int irq, void *data)
378 {
379         handle_smd_irq(&smd_ch_list_modem, notify_modem_smd);
380         return IRQ_HANDLED;
381 }
382 
383 #if defined(CONFIG_QDSP6)
384 static irqreturn_t smd_dsp_irq_handler(int irq, void *data)
385 {
386         handle_smd_irq(&smd_ch_list_dsp, notify_dsp_smd);
387         return IRQ_HANDLED;
388 }
389 #endif
390 
391 static void smd_fake_irq_handler(unsigned long arg)
392 {
393         handle_smd_irq(&smd_ch_list_modem, notify_modem_smd);
394         handle_smd_irq(&smd_ch_list_dsp, notify_dsp_smd);
395 }
396 
397 static DECLARE_TASKLET(smd_fake_irq_tasklet, smd_fake_irq_handler, 0);
398 
399 static inline int smd_need_int(struct smd_channel *ch)
400 {
401         if (ch_is_open(ch)) {
402                 if (ch->recv->fHEAD || ch->recv->fTAIL || ch->recv->fSTATE)
403                         return 1;
404                 if (ch->recv->state != ch->last_state)
405                         return 1;
406         }
407         return 0;
408 }
409 
410 void smd_sleep_exit(void)
411 {
412         unsigned long flags;
413         struct smd_channel *ch;
414         int need_int = 0;
415 
416         spin_lock_irqsave(&smd_lock, flags);
417         list_for_each_entry(ch, &smd_ch_list_modem, ch_list) {
418                 if (smd_need_int(ch)) {
419                         need_int = 1;
420                         break;
421                 }
422         }
423         list_for_each_entry(ch, &smd_ch_list_dsp, ch_list) {
424                 if (smd_need_int(ch)) {
425                         need_int = 1;
426                         break;
427                 }
428         }
429         spin_unlock_irqrestore(&smd_lock, flags);
430         do_smd_probe();
431 
432         if (need_int) {
433                 if (msm_smd_debug_mask & MSM_SMD_DEBUG)
434                         pr_info("smd_sleep_exit need interrupt\n");
435                 tasklet_schedule(&smd_fake_irq_tasklet);
436         }
437 }
438 
439 
440 void smd_kick(smd_channel_t *ch)
441 {
442         unsigned long flags;
443         unsigned tmp;
444 
445         spin_lock_irqsave(&smd_lock, flags);
446         ch->update_state(ch);
447         tmp = ch->recv->state;
448         if (tmp != ch->last_state) {
449                 ch->last_state = tmp;
450                 if (tmp == SMD_SS_OPENED)
451                         ch->notify(ch->priv, SMD_EVENT_OPEN);
452                 else
453                         ch->notify(ch->priv, SMD_EVENT_CLOSE);
454         }
455         ch->notify(ch->priv, SMD_EVENT_DATA);
456         ch->notify_other_cpu();
457         spin_unlock_irqrestore(&smd_lock, flags);
458 }
459 
460 static int smd_is_packet(int chn, unsigned type)
461 {
462         type &= SMD_KIND_MASK;
463         if (type == SMD_KIND_PACKET)
464                 return 1;
465         if (type == SMD_KIND_STREAM)
466                 return 0;
467 
468         /* older AMSS reports SMD_KIND_UNKNOWN always */
469         if ((chn > 4) || (chn == 1))
470                 return 1;
471         else
472                 return 0;
473 }
474 
475 static int smd_stream_write(smd_channel_t *ch, const void *_data, int len)
476 {
477         void *ptr;
478         const unsigned char *buf = _data;
479         unsigned xfer;
480         int orig_len = len;
481 
482         if (len < 0)
483                 return -EINVAL;
484 
485         while ((xfer = ch_write_buffer(ch, &ptr)) != 0) {
486                 if (!ch_is_open(ch))
487                         break;
488                 if (xfer > len)
489                         xfer = len;
490                 memcpy(ptr, buf, xfer);
491                 ch_write_done(ch, xfer);
492                 len -= xfer;
493                 buf += xfer;
494                 if (len == 0)
495                         break;
496         }
497 
498         ch->notify_other_cpu();
499 
500         return orig_len - len;
501 }
502 
503 static int smd_packet_write(smd_channel_t *ch, const void *_data, int len)
504 {
505         unsigned hdr[5];
506 
507         if (len < 0)
508                 return -EINVAL;
509 
510         if (smd_stream_write_avail(ch) < (len + SMD_HEADER_SIZE))
511                 return -ENOMEM;
512 
513         hdr[0] = len;
514         hdr[1] = hdr[2] = hdr[3] = hdr[4] = 0;
515 
516         smd_stream_write(ch, hdr, sizeof(hdr));
517         smd_stream_write(ch, _data, len);
518 
519         return len;
520 }
521 
522 static int smd_stream_read(smd_channel_t *ch, void *data, int len)
523 {
524         int r;
525 
526         if (len < 0)
527                 return -EINVAL;
528 
529         r = ch_read(ch, data, len);
530         if (r > 0)
531                 ch->notify_other_cpu();
532 
533         return r;
534 }
535 
536 static int smd_packet_read(smd_channel_t *ch, void *data, int len)
537 {
538         unsigned long flags;
539         int r;
540 
541         if (len < 0)
542                 return -EINVAL;
543 
544         if (len > ch->current_packet)
545                 len = ch->current_packet;
546 
547         r = ch_read(ch, data, len);
548         if (r > 0)
549                 ch->notify_other_cpu();
550 
551         spin_lock_irqsave(&smd_lock, flags);
552         ch->current_packet -= r;
553         update_packet_state(ch);
554         spin_unlock_irqrestore(&smd_lock, flags);
555 
556         return r;
557 }
558 
559 static int smd_alloc_channel(const char *name, uint32_t cid, uint32_t type)
560 {
561         struct smd_channel *ch;
562 
563         ch = kzalloc(sizeof(struct smd_channel), GFP_KERNEL);
564         if (ch == 0) {
565                 pr_err("smd_alloc_channel() out of memory\n");
566                 return -1;
567         }
568         ch->n = cid;
569 
570         if (_smd_alloc_channel(ch)) {
571                 kfree(ch);
572                 return -1;
573         }
574 
575         ch->fifo_mask = ch->fifo_size - 1;
576         ch->type = type;
577 
578         if ((type & SMD_TYPE_MASK) == SMD_TYPE_APPS_MODEM)
579                 ch->notify_other_cpu = notify_modem_smd;
580         else
581                 ch->notify_other_cpu = notify_dsp_smd;
582 
583         if (smd_is_packet(cid, type)) {
584                 ch->read = smd_packet_read;
585                 ch->write = smd_packet_write;
586                 ch->read_avail = smd_packet_read_avail;
587                 ch->write_avail = smd_packet_write_avail;
588                 ch->update_state = update_packet_state;
589         } else {
590                 ch->read = smd_stream_read;
591                 ch->write = smd_stream_write;
592                 ch->read_avail = smd_stream_read_avail;
593                 ch->write_avail = smd_stream_write_avail;
594                 ch->update_state = update_stream_state;
595         }
596 
597         if ((type & 0xff) == 0)
598                 memcpy(ch->name, "SMD_", 4);
599         else
600                 memcpy(ch->name, "DSP_", 4);
601         memcpy(ch->name + 4, name, 20);
602         ch->name[23] = 0;
603         ch->pdev.name = ch->name;
604         ch->pdev.id = -1;
605 
606         pr_debug("smd_alloc_channel() cid=%02d size=%05d '%s'\n",
607                 ch->n, ch->fifo_size, ch->name);
608 
609         mutex_lock(&smd_creation_mutex);
610         list_add(&ch->ch_list, &smd_ch_closed_list);
611         mutex_unlock(&smd_creation_mutex);
612 
613         platform_device_register(&ch->pdev);
614         return 0;
615 }
616 
617 static void smd_channel_probe_worker(struct work_struct *work)
618 {
619         struct smd_alloc_elm *shared;
620         unsigned ctype;
621         unsigned type;
622         unsigned n;
623 
624         shared = smem_find(ID_CH_ALLOC_TBL, sizeof(*shared) * 64);
625         if (!shared) {
626                 pr_err("cannot find allocation table\n");
627                 return;
628         }
629         for (n = 0; n < 64; n++) {
630                 if (smd_ch_allocated[n])
631                         continue;
632                 if (!shared[n].ref_count)
633                         continue;
634                 if (!shared[n].name[0])
635                         continue;
636                 ctype = shared[n].ctype;
637                 type = ctype & SMD_TYPE_MASK;
638 
639                 /* DAL channels are stream but neither the modem,
640                  * nor the DSP correctly indicate this.  Fixup manually.
641                  */
642                 if (!memcmp(shared[n].name, "DAL", 3))
643                         ctype = (ctype & (~SMD_KIND_MASK)) | SMD_KIND_STREAM;
644 
645                 type = shared[n].ctype & SMD_TYPE_MASK;
646                 if ((type == SMD_TYPE_APPS_MODEM) ||
647                     (type == SMD_TYPE_APPS_DSP))
648                         if (!smd_alloc_channel(shared[n].name, shared[n].cid, ctype))
649                                 smd_ch_allocated[n] = 1;
650         }
651 }
652 
653 static void do_nothing_notify(void *priv, unsigned flags)
654 {
655 }
656 
657 struct smd_channel *smd_get_channel(const char *name)
658 {
659         struct smd_channel *ch;
660 
661         mutex_lock(&smd_creation_mutex);
662         list_for_each_entry(ch, &smd_ch_closed_list, ch_list) {
663                 if (!strcmp(name, ch->name)) {
664                         list_del(&ch->ch_list);
665                         mutex_unlock(&smd_creation_mutex);
666                         return ch;
667                 }
668         }
669         mutex_unlock(&smd_creation_mutex);
670 
671         return NULL;
672 }
673 
674 int smd_open(const char *name, smd_channel_t **_ch,
675              void *priv, void (*notify)(void *, unsigned))
676 {
677         struct smd_channel *ch;
678         unsigned long flags;
679 
680         if (smd_initialized == 0) {
681                 pr_info("smd_open() before smd_init()\n");
682                 return -ENODEV;
683         }
684 
685         ch = smd_get_channel(name);
686         if (!ch)
687                 return -ENODEV;
688 
689         if (notify == 0)
690                 notify = do_nothing_notify;
691 
692         ch->notify = notify;
693         ch->current_packet = 0;
694         ch->last_state = SMD_SS_CLOSED;
695         ch->priv = priv;
696 
697         *_ch = ch;
698 
699         spin_lock_irqsave(&smd_lock, flags);
700 
701         if ((ch->type & SMD_TYPE_MASK) == SMD_TYPE_APPS_MODEM)
702                 list_add(&ch->ch_list, &smd_ch_list_modem);
703         else
704                 list_add(&ch->ch_list, &smd_ch_list_dsp);
705 
706         /* If the remote side is CLOSING, we need to get it to
707          * move to OPENING (which we'll do by moving from CLOSED to
708          * OPENING) and then get it to move from OPENING to
709          * OPENED (by doing the same state change ourselves).
710          *
711          * Otherwise, it should be OPENING and we can move directly
712          * to OPENED so that it will follow.
713          */
714         if (ch->recv->state == SMD_SS_CLOSING) {
715                 ch->send->head = 0;
716                 ch_set_state(ch, SMD_SS_OPENING);
717         } else {
718                 ch_set_state(ch, SMD_SS_OPENED);
719         }
720         spin_unlock_irqrestore(&smd_lock, flags);
721         smd_kick(ch);
722 
723         return 0;
724 }
725 
726 int smd_close(smd_channel_t *ch)
727 {
728         unsigned long flags;
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 
746 int smd_read(smd_channel_t *ch, void *data, int len)
747 {
748         return ch->read(ch, data, len);
749 }
750 
751 int smd_write(smd_channel_t *ch, const void *data, int len)
752 {
753         return ch->write(ch, data, len);
754 }
755 
756 int 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 
766 int smd_read_avail(smd_channel_t *ch)
767 {
768         return ch->read_avail(ch);
769 }
770 
771 int smd_write_avail(smd_channel_t *ch)
772 {
773         return ch->write_avail(ch);
774 }
775 
776 int smd_wait_until_readable(smd_channel_t *ch, int bytes)
777 {
778         return -1;
779 }
780 
781 int smd_wait_until_writable(smd_channel_t *ch, int bytes)
782 {
783         return -1;
784 }
785 
786 int smd_cur_packet_size(smd_channel_t *ch)
787 {
788         return ch->current_packet;
789 }
790 
791 
792 /* ------------------------------------------------------------------------- */
793 
794 void *smem_alloc(unsigned id, unsigned size)
795 {
796         return smem_find(id, size);
797 }
798 
799 void *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 
817 void *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 
836 static 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 
857 int 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 
884 uint32_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 
903 int 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 
921 int 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 
939 int smd_core_init(void)
940 {
941         int r;
942 
943         /* wait for essential items to be initialized */
944         for (;;) {
945                 unsigned size;
946                 void *state;
947                 state = smem_item(SMEM_SMSM_SHARED_STATE, &size);
948                 if (size == SMSM_V1_SIZE || size == SMSM_V2_SIZE) {
949                         smd_info.state = (unsigned)state;
950                         break;
951                 }
952         }
953 
954         smd_info.ready = 1;
955 
956         r = request_irq(INT_A9_M2A_0, smd_modem_irq_handler,
957                         IRQF_TRIGGER_RISING, "smd_dev", 0);
958         if (r < 0)
959                 return r;
960         r = enable_irq_wake(INT_A9_M2A_0);
961         if (r < 0)
962                 pr_err("smd_core_init: enable_irq_wake failed for A9_M2A_0\n");
963 
964         r = request_irq(INT_A9_M2A_5, smsm_irq_handler,
965                         IRQF_TRIGGER_RISING, "smsm_dev", 0);
966         if (r < 0) {
967                 free_irq(INT_A9_M2A_0, 0);
968                 return r;
969         }
970         r = enable_irq_wake(INT_A9_M2A_5);
971         if (r < 0)
972                 pr_err("smd_core_init: enable_irq_wake failed for A9_M2A_5\n");
973 
974 #if defined(CONFIG_QDSP6)
975         r = request_irq(INT_ADSP_A11, smd_dsp_irq_handler,
976                         IRQF_TRIGGER_RISING, "smd_dsp", 0);
977         if (r < 0) {
978                 free_irq(INT_A9_M2A_0, 0);
979                 free_irq(INT_A9_M2A_5, 0);
980                 return r;
981         }
982 #endif
983 
984         /* check for any SMD channels that may already exist */
985         do_smd_probe();
986 
987         /* indicate that we're up and running */
988         smsm_change_state(SMSM_STATE_APPS,
989                           ~0, SMSM_INIT | SMSM_SMDINIT | SMSM_RPCINIT | SMSM_RUN);
990 #ifdef CONFIG_ARCH_MSM_SCORPION
991         smsm_change_state(SMSM_STATE_APPS_DEM, ~0, 0);
992 #endif
993 
994         return 0;
995 }
996 
997 static int __devinit msm_smd_probe(struct platform_device *pdev)
998 {
999         /*
1000          * If we haven't waited for the ARM9 to boot up till now,
1001          * then we need to wait here. Otherwise this should just
1002          * return immediately.
1003          */
1004         proc_comm_boot_wait();
1005 
1006         INIT_WORK(&probe_work, smd_channel_probe_worker);
1007 
1008         if (smd_core_init()) {
1009                 pr_err("smd_core_init() failed\n");
1010                 return -1;
1011         }
1012 
1013         do_smd_probe();
1014 
1015         msm_check_for_modem_crash = check_for_modem_crash;
1016 
1017         msm_init_last_radio_log(THIS_MODULE);
1018 
1019         smd_initialized = 1;
1020 
1021         return 0;
1022 }
1023 
1024 static struct platform_driver msm_smd_driver = {
1025         .probe = msm_smd_probe,
1026         .driver = {
1027                 .name = MODULE_NAME,
1028                 .owner = THIS_MODULE,
1029         },
1030 };
1031 
1032 static int __init msm_smd_init(void)
1033 {
1034         return platform_driver_register(&msm_smd_driver);
1035 }
1036 
1037 module_init(msm_smd_init);
1038 
1039 MODULE_DESCRIPTION("MSM Shared Memory Core");
1040 MODULE_AUTHOR("Brian Swetland <swetland@google.com>");
1041 MODULE_LICENSE("GPL");
1042 

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