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2eb44eb9 BS |
1 | /* arch/arm/mach-msm/smd.c |
2 | * | |
3 | * Copyright (C) 2007 Google, Inc. | |
4 | * Author: Brian Swetland <swetland@google.com> | |
5 | * | |
6 | * This software is licensed under the terms of the GNU General Public | |
7 | * License version 2, as published by the Free Software Foundation, and | |
8 | * may be copied, distributed, and modified under those terms. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | * GNU General Public License for more details. | |
14 | * | |
15 | */ | |
16 | ||
17 | #include <linux/platform_device.h> | |
18 | #include <linux/module.h> | |
19 | #include <linux/fs.h> | |
20 | #include <linux/cdev.h> | |
21 | #include <linux/device.h> | |
22 | #include <linux/wait.h> | |
23 | #include <linux/interrupt.h> | |
24 | #include <linux/irq.h> | |
25 | #include <linux/list.h> | |
26 | #include <linux/slab.h> | |
27 | #include <linux/debugfs.h> | |
28 | #include <linux/delay.h> | |
29 | #include <linux/io.h> | |
30 | ||
31 | #include <mach/msm_smd.h> | |
32 | #include <mach/msm_iomap.h> | |
33 | #include <mach/system.h> | |
34 | ||
35 | #include "smd_private.h" | |
36 | #include "proc_comm.h" | |
37 | ||
38 | void (*msm_hw_reset_hook)(void); | |
39 | ||
40 | #define MODULE_NAME "msm_smd" | |
41 | ||
42 | enum { | |
43 | MSM_SMD_DEBUG = 1U << 0, | |
44 | MSM_SMSM_DEBUG = 1U << 0, | |
45 | }; | |
46 | ||
47 | static int msm_smd_debug_mask; | |
48 | ||
03e00cd3 | 49 | struct shared_info { |
5b0f5a3f | 50 | int ready; |
28379410 | 51 | unsigned state; |
5b0f5a3f BS |
52 | }; |
53 | ||
28379410 | 54 | static unsigned dummy_state[SMSM_STATE_COUNT]; |
5b0f5a3f BS |
55 | |
56 | static struct shared_info smd_info = { | |
28379410 | 57 | .state = (unsigned) &dummy_state, |
5b0f5a3f BS |
58 | }; |
59 | ||
2eb44eb9 BS |
60 | module_param_named(debug_mask, msm_smd_debug_mask, |
61 | int, S_IRUGO | S_IWUSR | S_IWGRP); | |
62 | ||
03e00cd3 | 63 | void *smem_item(unsigned id, unsigned *size); |
2eb44eb9 BS |
64 | static void smd_diag(void); |
65 | ||
66 | static unsigned last_heap_free = 0xffffffff; | |
67 | ||
68 | #define MSM_A2M_INT(n) (MSM_CSR_BASE + 0x400 + (n) * 4) | |
69 | ||
70 | static inline void notify_other_smsm(void) | |
71 | { | |
72 | writel(1, MSM_A2M_INT(5)); | |
73 | } | |
74 | ||
5b0f5a3f | 75 | static inline void notify_modem_smd(void) |
2eb44eb9 BS |
76 | { |
77 | writel(1, MSM_A2M_INT(0)); | |
78 | } | |
79 | ||
5b0f5a3f BS |
80 | static inline void notify_dsp_smd(void) |
81 | { | |
82 | writel(1, MSM_A2M_INT(8)); | |
83 | } | |
84 | ||
2eb44eb9 BS |
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_info("smem: 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 | /* 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 | ||
111 | extern int (*msm_check_for_modem_crash)(void); | |
112 | ||
28379410 AH |
113 | uint32_t raw_smsm_get_state(enum smsm_state_item item) |
114 | { | |
115 | return readl(smd_info.state + item * 4); | |
116 | } | |
117 | ||
2eb44eb9 BS |
118 | static int check_for_modem_crash(void) |
119 | { | |
28379410 | 120 | if (raw_smsm_get_state(SMSM_STATE_MODEM) & SMSM_RESET) { |
2eb44eb9 BS |
121 | handle_modem_crash(); |
122 | return -1; | |
2eb44eb9 | 123 | } |
5b0f5a3f | 124 | return 0; |
2eb44eb9 BS |
125 | } |
126 | ||
2eb44eb9 | 127 | /* the spinlock is used to synchronize between the |
03e00cd3 BS |
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); | |
2eb44eb9 BS |
133 | |
134 | /* the mutex is used during open() and close() | |
03e00cd3 BS |
135 | * operations to avoid races while creating or |
136 | * destroying smd_channel structures | |
137 | */ | |
2eb44eb9 BS |
138 | static DEFINE_MUTEX(smd_creation_mutex); |
139 | ||
140 | static int smd_initialized; | |
141 | ||
03e00cd3 BS |
142 | LIST_HEAD(smd_ch_closed_list); |
143 | LIST_HEAD(smd_ch_list); /* todo: per-target lists */ | |
2eb44eb9 BS |
144 | |
145 | static unsigned char smd_ch_allocated[64]; | |
146 | static struct work_struct probe_work; | |
147 | ||
148 | static void smd_alloc_channel(const char *name, uint32_t cid, uint32_t type); | |
149 | ||
150 | static void smd_channel_probe_worker(struct work_struct *work) | |
151 | { | |
152 | struct smd_alloc_elm *shared; | |
5b0f5a3f | 153 | unsigned type; |
2eb44eb9 BS |
154 | unsigned n; |
155 | ||
156 | shared = smem_find(ID_CH_ALLOC_TBL, sizeof(*shared) * 64); | |
4d4fb266 BS |
157 | if (!shared) { |
158 | pr_err("smd: cannot find allocation table\n"); | |
159 | return; | |
160 | } | |
2eb44eb9 BS |
161 | for (n = 0; n < 64; n++) { |
162 | if (smd_ch_allocated[n]) | |
163 | continue; | |
164 | if (!shared[n].ref_count) | |
165 | continue; | |
166 | if (!shared[n].name[0]) | |
167 | continue; | |
5b0f5a3f BS |
168 | type = shared[n].ctype & SMD_TYPE_MASK; |
169 | if ((type == SMD_TYPE_APPS_MODEM) || | |
170 | (type == SMD_TYPE_APPS_DSP)) | |
171 | smd_alloc_channel(shared[n].name, | |
172 | shared[n].cid, | |
173 | shared[n].ctype); | |
2eb44eb9 BS |
174 | smd_ch_allocated[n] = 1; |
175 | } | |
176 | } | |
177 | ||
2eb44eb9 BS |
178 | /* how many bytes are available for reading */ |
179 | static int smd_stream_read_avail(struct smd_channel *ch) | |
180 | { | |
5b0f5a3f | 181 | return (ch->recv->head - ch->recv->tail) & ch->fifo_mask; |
2eb44eb9 BS |
182 | } |
183 | ||
184 | /* how many bytes we are free to write */ | |
185 | static int smd_stream_write_avail(struct smd_channel *ch) | |
186 | { | |
5b0f5a3f BS |
187 | return ch->fifo_mask - |
188 | ((ch->send->head - ch->send->tail) & ch->fifo_mask); | |
2eb44eb9 BS |
189 | } |
190 | ||
191 | static int smd_packet_read_avail(struct smd_channel *ch) | |
192 | { | |
193 | if (ch->current_packet) { | |
194 | int n = smd_stream_read_avail(ch); | |
195 | if (n > ch->current_packet) | |
196 | n = ch->current_packet; | |
197 | return n; | |
198 | } else { | |
199 | return 0; | |
200 | } | |
201 | } | |
202 | ||
203 | static int smd_packet_write_avail(struct smd_channel *ch) | |
204 | { | |
205 | int n = smd_stream_write_avail(ch); | |
206 | return n > SMD_HEADER_SIZE ? n - SMD_HEADER_SIZE : 0; | |
207 | } | |
208 | ||
209 | static int ch_is_open(struct smd_channel *ch) | |
210 | { | |
211 | return (ch->recv->state == SMD_SS_OPENED) && | |
212 | (ch->send->state == SMD_SS_OPENED); | |
213 | } | |
214 | ||
215 | /* provide a pointer and length to readable data in the fifo */ | |
216 | static unsigned ch_read_buffer(struct smd_channel *ch, void **ptr) | |
217 | { | |
218 | unsigned head = ch->recv->head; | |
219 | unsigned tail = ch->recv->tail; | |
5b0f5a3f | 220 | *ptr = (void *) (ch->recv_data + tail); |
2eb44eb9 BS |
221 | |
222 | if (tail <= head) | |
223 | return head - tail; | |
224 | else | |
5b0f5a3f | 225 | return ch->fifo_size - tail; |
2eb44eb9 BS |
226 | } |
227 | ||
228 | /* advance the fifo read pointer after data from ch_read_buffer is consumed */ | |
229 | static void ch_read_done(struct smd_channel *ch, unsigned count) | |
230 | { | |
231 | BUG_ON(count > smd_stream_read_avail(ch)); | |
5b0f5a3f | 232 | ch->recv->tail = (ch->recv->tail + count) & ch->fifo_mask; |
2eb44eb9 BS |
233 | ch->recv->fTAIL = 1; |
234 | } | |
235 | ||
236 | /* basic read interface to ch_read_{buffer,done} used | |
03e00cd3 BS |
237 | * by smd_*_read() and update_packet_state() |
238 | * will read-and-discard if the _data pointer is null | |
239 | */ | |
2eb44eb9 BS |
240 | static int ch_read(struct smd_channel *ch, void *_data, int len) |
241 | { | |
242 | void *ptr; | |
243 | unsigned n; | |
244 | unsigned char *data = _data; | |
245 | int orig_len = len; | |
246 | ||
247 | while (len > 0) { | |
248 | n = ch_read_buffer(ch, &ptr); | |
249 | if (n == 0) | |
250 | break; | |
251 | ||
252 | if (n > len) | |
253 | n = len; | |
254 | if (_data) | |
255 | memcpy(data, ptr, n); | |
256 | ||
257 | data += n; | |
258 | len -= n; | |
259 | ch_read_done(ch, n); | |
260 | } | |
261 | ||
262 | return orig_len - len; | |
263 | } | |
264 | ||
265 | static void update_stream_state(struct smd_channel *ch) | |
266 | { | |
267 | /* streams have no special state requiring updating */ | |
268 | } | |
269 | ||
270 | static void update_packet_state(struct smd_channel *ch) | |
271 | { | |
272 | unsigned hdr[5]; | |
273 | int r; | |
274 | ||
275 | /* can't do anything if we're in the middle of a packet */ | |
276 | if (ch->current_packet != 0) | |
277 | return; | |
278 | ||
279 | /* don't bother unless we can get the full header */ | |
280 | if (smd_stream_read_avail(ch) < SMD_HEADER_SIZE) | |
281 | return; | |
282 | ||
283 | r = ch_read(ch, hdr, SMD_HEADER_SIZE); | |
284 | BUG_ON(r != SMD_HEADER_SIZE); | |
285 | ||
286 | ch->current_packet = hdr[0]; | |
287 | } | |
288 | ||
289 | /* provide a pointer and length to next free space in the fifo */ | |
290 | static unsigned ch_write_buffer(struct smd_channel *ch, void **ptr) | |
291 | { | |
292 | unsigned head = ch->send->head; | |
293 | unsigned tail = ch->send->tail; | |
5b0f5a3f | 294 | *ptr = (void *) (ch->send_data + head); |
2eb44eb9 BS |
295 | |
296 | if (head < tail) { | |
297 | return tail - head - 1; | |
298 | } else { | |
299 | if (tail == 0) | |
5b0f5a3f | 300 | return ch->fifo_size - head - 1; |
2eb44eb9 | 301 | else |
5b0f5a3f | 302 | return ch->fifo_size - head; |
2eb44eb9 BS |
303 | } |
304 | } | |
305 | ||
306 | /* advace the fifo write pointer after freespace | |
307 | * from ch_write_buffer is filled | |
308 | */ | |
309 | static void ch_write_done(struct smd_channel *ch, unsigned count) | |
310 | { | |
311 | BUG_ON(count > smd_stream_write_avail(ch)); | |
5b0f5a3f | 312 | ch->send->head = (ch->send->head + count) & ch->fifo_mask; |
2eb44eb9 BS |
313 | ch->send->fHEAD = 1; |
314 | } | |
315 | ||
5b0f5a3f | 316 | static void ch_set_state(struct smd_channel *ch, unsigned n) |
2eb44eb9 BS |
317 | { |
318 | if (n == SMD_SS_OPENED) { | |
5b0f5a3f BS |
319 | ch->send->fDSR = 1; |
320 | ch->send->fCTS = 1; | |
321 | ch->send->fCD = 1; | |
2eb44eb9 | 322 | } else { |
5b0f5a3f BS |
323 | ch->send->fDSR = 0; |
324 | ch->send->fCTS = 0; | |
325 | ch->send->fCD = 0; | |
2eb44eb9 | 326 | } |
5b0f5a3f BS |
327 | ch->send->state = n; |
328 | ch->send->fSTATE = 1; | |
329 | ch->notify_other_cpu(); | |
2eb44eb9 BS |
330 | } |
331 | ||
332 | static void do_smd_probe(void) | |
333 | { | |
334 | struct smem_shared *shared = (void *) MSM_SHARED_RAM_BASE; | |
335 | if (shared->heap_info.free_offset != last_heap_free) { | |
336 | last_heap_free = shared->heap_info.free_offset; | |
337 | schedule_work(&probe_work); | |
338 | } | |
339 | } | |
340 | ||
341 | static void smd_state_change(struct smd_channel *ch, | |
342 | unsigned last, unsigned next) | |
343 | { | |
344 | ch->last_state = next; | |
345 | ||
03e00cd3 | 346 | pr_info("SMD: ch %d %d -> %d\n", ch->n, last, next); |
2eb44eb9 BS |
347 | |
348 | switch (next) { | |
349 | case SMD_SS_OPENING: | |
350 | ch->recv->tail = 0; | |
351 | case SMD_SS_OPENED: | |
352 | if (ch->send->state != SMD_SS_OPENED) | |
5b0f5a3f | 353 | ch_set_state(ch, SMD_SS_OPENED); |
2eb44eb9 BS |
354 | ch->notify(ch->priv, SMD_EVENT_OPEN); |
355 | break; | |
356 | case SMD_SS_FLUSHING: | |
357 | case SMD_SS_RESET: | |
358 | /* we should force them to close? */ | |
359 | default: | |
360 | ch->notify(ch->priv, SMD_EVENT_CLOSE); | |
361 | } | |
362 | } | |
363 | ||
5b0f5a3f | 364 | static void handle_smd_irq(struct list_head *list, void (*notify)(void)) |
2eb44eb9 BS |
365 | { |
366 | unsigned long flags; | |
367 | struct smd_channel *ch; | |
368 | int do_notify = 0; | |
369 | unsigned ch_flags; | |
370 | unsigned tmp; | |
371 | ||
372 | spin_lock_irqsave(&smd_lock, flags); | |
5b0f5a3f | 373 | list_for_each_entry(ch, list, ch_list) { |
2eb44eb9 BS |
374 | ch_flags = 0; |
375 | if (ch_is_open(ch)) { | |
376 | if (ch->recv->fHEAD) { | |
377 | ch->recv->fHEAD = 0; | |
378 | ch_flags |= 1; | |
379 | do_notify |= 1; | |
380 | } | |
381 | if (ch->recv->fTAIL) { | |
382 | ch->recv->fTAIL = 0; | |
383 | ch_flags |= 2; | |
384 | do_notify |= 1; | |
385 | } | |
386 | if (ch->recv->fSTATE) { | |
387 | ch->recv->fSTATE = 0; | |
388 | ch_flags |= 4; | |
389 | do_notify |= 1; | |
390 | } | |
391 | } | |
392 | tmp = ch->recv->state; | |
393 | if (tmp != ch->last_state) | |
394 | smd_state_change(ch, ch->last_state, tmp); | |
395 | if (ch_flags) { | |
396 | ch->update_state(ch); | |
397 | ch->notify(ch->priv, SMD_EVENT_DATA); | |
398 | } | |
399 | } | |
400 | if (do_notify) | |
5b0f5a3f | 401 | notify(); |
2eb44eb9 BS |
402 | spin_unlock_irqrestore(&smd_lock, flags); |
403 | do_smd_probe(); | |
5b0f5a3f BS |
404 | } |
405 | ||
406 | static irqreturn_t smd_irq_handler(int irq, void *data) | |
407 | { | |
408 | handle_smd_irq(&smd_ch_list, notify_modem_smd); | |
2eb44eb9 BS |
409 | return IRQ_HANDLED; |
410 | } | |
411 | ||
412 | static void smd_fake_irq_handler(unsigned long arg) | |
413 | { | |
414 | smd_irq_handler(0, NULL); | |
415 | } | |
416 | ||
417 | static DECLARE_TASKLET(smd_fake_irq_tasklet, smd_fake_irq_handler, 0); | |
418 | ||
419 | void smd_sleep_exit(void) | |
420 | { | |
421 | unsigned long flags; | |
422 | struct smd_channel *ch; | |
423 | unsigned tmp; | |
424 | int need_int = 0; | |
425 | ||
426 | spin_lock_irqsave(&smd_lock, flags); | |
427 | list_for_each_entry(ch, &smd_ch_list, ch_list) { | |
428 | if (ch_is_open(ch)) { | |
429 | if (ch->recv->fHEAD) { | |
430 | if (msm_smd_debug_mask & MSM_SMD_DEBUG) | |
431 | pr_info("smd_sleep_exit ch %d fHEAD " | |
432 | "%x %x %x\n", | |
433 | ch->n, ch->recv->fHEAD, | |
434 | ch->recv->head, ch->recv->tail); | |
435 | need_int = 1; | |
436 | break; | |
437 | } | |
438 | if (ch->recv->fTAIL) { | |
439 | if (msm_smd_debug_mask & MSM_SMD_DEBUG) | |
440 | pr_info("smd_sleep_exit ch %d fTAIL " | |
441 | "%x %x %x\n", | |
442 | ch->n, ch->recv->fTAIL, | |
443 | ch->send->head, ch->send->tail); | |
444 | need_int = 1; | |
445 | break; | |
446 | } | |
447 | if (ch->recv->fSTATE) { | |
448 | if (msm_smd_debug_mask & MSM_SMD_DEBUG) | |
449 | pr_info("smd_sleep_exit ch %d fSTATE %x" | |
450 | "\n", ch->n, ch->recv->fSTATE); | |
451 | need_int = 1; | |
452 | break; | |
453 | } | |
454 | tmp = ch->recv->state; | |
455 | if (tmp != ch->last_state) { | |
456 | if (msm_smd_debug_mask & MSM_SMD_DEBUG) | |
457 | pr_info("smd_sleep_exit ch %d " | |
458 | "state %x != %x\n", | |
459 | ch->n, tmp, ch->last_state); | |
460 | need_int = 1; | |
461 | break; | |
462 | } | |
463 | } | |
464 | } | |
465 | spin_unlock_irqrestore(&smd_lock, flags); | |
466 | do_smd_probe(); | |
467 | if (need_int) { | |
468 | if (msm_smd_debug_mask & MSM_SMD_DEBUG) | |
469 | pr_info("smd_sleep_exit need interrupt\n"); | |
470 | tasklet_schedule(&smd_fake_irq_tasklet); | |
471 | } | |
472 | } | |
473 | ||
474 | ||
475 | void smd_kick(smd_channel_t *ch) | |
476 | { | |
477 | unsigned long flags; | |
478 | unsigned tmp; | |
479 | ||
480 | spin_lock_irqsave(&smd_lock, flags); | |
481 | ch->update_state(ch); | |
482 | tmp = ch->recv->state; | |
483 | if (tmp != ch->last_state) { | |
484 | ch->last_state = tmp; | |
485 | if (tmp == SMD_SS_OPENED) | |
486 | ch->notify(ch->priv, SMD_EVENT_OPEN); | |
487 | else | |
488 | ch->notify(ch->priv, SMD_EVENT_CLOSE); | |
489 | } | |
490 | ch->notify(ch->priv, SMD_EVENT_DATA); | |
5b0f5a3f | 491 | ch->notify_other_cpu(); |
2eb44eb9 BS |
492 | spin_unlock_irqrestore(&smd_lock, flags); |
493 | } | |
494 | ||
5b0f5a3f | 495 | static int smd_is_packet(int chn, unsigned type) |
2eb44eb9 | 496 | { |
5b0f5a3f BS |
497 | type &= SMD_KIND_MASK; |
498 | if (type == SMD_KIND_PACKET) | |
499 | return 1; | |
500 | if (type == SMD_KIND_STREAM) | |
501 | return 0; | |
502 | ||
503 | /* older AMSS reports SMD_KIND_UNKNOWN always */ | |
2eb44eb9 BS |
504 | if ((chn > 4) || (chn == 1)) |
505 | return 1; | |
506 | else | |
507 | return 0; | |
508 | } | |
509 | ||
510 | static int smd_stream_write(smd_channel_t *ch, const void *_data, int len) | |
511 | { | |
512 | void *ptr; | |
513 | const unsigned char *buf = _data; | |
514 | unsigned xfer; | |
515 | int orig_len = len; | |
516 | ||
517 | if (len < 0) | |
518 | return -EINVAL; | |
519 | ||
520 | while ((xfer = ch_write_buffer(ch, &ptr)) != 0) { | |
521 | if (!ch_is_open(ch)) | |
522 | break; | |
523 | if (xfer > len) | |
524 | xfer = len; | |
525 | memcpy(ptr, buf, xfer); | |
526 | ch_write_done(ch, xfer); | |
527 | len -= xfer; | |
528 | buf += xfer; | |
529 | if (len == 0) | |
530 | break; | |
531 | } | |
532 | ||
5b0f5a3f | 533 | ch->notify_other_cpu(); |
2eb44eb9 BS |
534 | |
535 | return orig_len - len; | |
536 | } | |
537 | ||
538 | static int smd_packet_write(smd_channel_t *ch, const void *_data, int len) | |
539 | { | |
540 | unsigned hdr[5]; | |
541 | ||
542 | if (len < 0) | |
543 | return -EINVAL; | |
544 | ||
545 | if (smd_stream_write_avail(ch) < (len + SMD_HEADER_SIZE)) | |
546 | return -ENOMEM; | |
547 | ||
548 | hdr[0] = len; | |
549 | hdr[1] = hdr[2] = hdr[3] = hdr[4] = 0; | |
550 | ||
551 | smd_stream_write(ch, hdr, sizeof(hdr)); | |
552 | smd_stream_write(ch, _data, len); | |
553 | ||
554 | return len; | |
555 | } | |
556 | ||
557 | static int smd_stream_read(smd_channel_t *ch, void *data, int len) | |
558 | { | |
559 | int r; | |
560 | ||
561 | if (len < 0) | |
562 | return -EINVAL; | |
563 | ||
564 | r = ch_read(ch, data, len); | |
565 | if (r > 0) | |
5b0f5a3f | 566 | ch->notify_other_cpu(); |
2eb44eb9 BS |
567 | |
568 | return r; | |
569 | } | |
570 | ||
571 | static int smd_packet_read(smd_channel_t *ch, void *data, int len) | |
572 | { | |
573 | unsigned long flags; | |
574 | int r; | |
575 | ||
576 | if (len < 0) | |
577 | return -EINVAL; | |
578 | ||
579 | if (len > ch->current_packet) | |
580 | len = ch->current_packet; | |
581 | ||
582 | r = ch_read(ch, data, len); | |
583 | if (r > 0) | |
5b0f5a3f | 584 | ch->notify_other_cpu(); |
2eb44eb9 BS |
585 | |
586 | spin_lock_irqsave(&smd_lock, flags); | |
587 | ch->current_packet -= r; | |
588 | update_packet_state(ch); | |
589 | spin_unlock_irqrestore(&smd_lock, flags); | |
590 | ||
591 | return r; | |
592 | } | |
593 | ||
5b0f5a3f | 594 | static int smd_alloc_v2(struct smd_channel *ch) |
2eb44eb9 | 595 | { |
5b0f5a3f BS |
596 | struct smd_shared_v2 *shared2; |
597 | void *buffer; | |
598 | unsigned buffer_sz; | |
2eb44eb9 | 599 | |
5b0f5a3f BS |
600 | shared2 = smem_alloc(SMEM_SMD_BASE_ID + ch->n, sizeof(*shared2)); |
601 | buffer = smem_item(SMEM_SMD_FIFO_BASE_ID + ch->n, &buffer_sz); | |
602 | ||
603 | if (!buffer) | |
604 | return -1; | |
605 | ||
606 | /* buffer must be a power-of-two size */ | |
607 | if (buffer_sz & (buffer_sz - 1)) | |
608 | return -1; | |
609 | ||
610 | buffer_sz /= 2; | |
611 | ch->send = &shared2->ch0; | |
612 | ch->recv = &shared2->ch1; | |
613 | ch->send_data = buffer; | |
614 | ch->recv_data = buffer + buffer_sz; | |
615 | ch->fifo_size = buffer_sz; | |
616 | return 0; | |
617 | } | |
618 | ||
619 | static int smd_alloc_v1(struct smd_channel *ch) | |
620 | { | |
621 | struct smd_shared_v1 *shared1; | |
622 | shared1 = smem_alloc(ID_SMD_CHANNELS + ch->n, sizeof(*shared1)); | |
623 | if (!shared1) { | |
624 | pr_err("smd_alloc_channel() cid %d does not exist\n", ch->n); | |
625 | return -1; | |
2eb44eb9 | 626 | } |
5b0f5a3f BS |
627 | ch->send = &shared1->ch0; |
628 | ch->recv = &shared1->ch1; | |
629 | ch->send_data = shared1->data0; | |
630 | ch->recv_data = shared1->data1; | |
631 | ch->fifo_size = SMD_BUF_SIZE; | |
632 | return 0; | |
633 | } | |
634 | ||
635 | ||
636 | static void smd_alloc_channel(const char *name, uint32_t cid, uint32_t type) | |
637 | { | |
638 | struct smd_channel *ch; | |
2eb44eb9 BS |
639 | |
640 | ch = kzalloc(sizeof(struct smd_channel), GFP_KERNEL); | |
641 | if (ch == 0) { | |
642 | pr_err("smd_alloc_channel() out of memory\n"); | |
643 | return; | |
644 | } | |
2eb44eb9 BS |
645 | ch->n = cid; |
646 | ||
5b0f5a3f BS |
647 | if (smd_alloc_v2(ch) && smd_alloc_v1(ch)) { |
648 | kfree(ch); | |
649 | return; | |
650 | } | |
651 | ||
652 | ch->fifo_mask = ch->fifo_size - 1; | |
653 | ch->type = type; | |
654 | ||
655 | if ((type & SMD_TYPE_MASK) == SMD_TYPE_APPS_MODEM) | |
656 | ch->notify_other_cpu = notify_modem_smd; | |
657 | else | |
658 | ch->notify_other_cpu = notify_dsp_smd; | |
659 | ||
660 | if (smd_is_packet(cid, type)) { | |
2eb44eb9 BS |
661 | ch->read = smd_packet_read; |
662 | ch->write = smd_packet_write; | |
663 | ch->read_avail = smd_packet_read_avail; | |
664 | ch->write_avail = smd_packet_write_avail; | |
665 | ch->update_state = update_packet_state; | |
666 | } else { | |
667 | ch->read = smd_stream_read; | |
668 | ch->write = smd_stream_write; | |
669 | ch->read_avail = smd_stream_read_avail; | |
670 | ch->write_avail = smd_stream_write_avail; | |
671 | ch->update_state = update_stream_state; | |
672 | } | |
673 | ||
5b0f5a3f BS |
674 | if ((type & 0xff) == 0) |
675 | memcpy(ch->name, "SMD_", 4); | |
676 | else | |
677 | memcpy(ch->name, "DSP_", 4); | |
2eb44eb9 BS |
678 | memcpy(ch->name + 4, name, 20); |
679 | ch->name[23] = 0; | |
680 | ch->pdev.name = ch->name; | |
681 | ch->pdev.id = -1; | |
682 | ||
5b0f5a3f BS |
683 | pr_info("smd_alloc_channel() cid=%02d size=%05d '%s'\n", |
684 | ch->n, ch->fifo_size, ch->name); | |
2eb44eb9 BS |
685 | |
686 | mutex_lock(&smd_creation_mutex); | |
687 | list_add(&ch->ch_list, &smd_ch_closed_list); | |
688 | mutex_unlock(&smd_creation_mutex); | |
689 | ||
690 | platform_device_register(&ch->pdev); | |
691 | } | |
692 | ||
693 | static void do_nothing_notify(void *priv, unsigned flags) | |
694 | { | |
695 | } | |
696 | ||
697 | struct smd_channel *smd_get_channel(const char *name) | |
698 | { | |
699 | struct smd_channel *ch; | |
700 | ||
701 | mutex_lock(&smd_creation_mutex); | |
702 | list_for_each_entry(ch, &smd_ch_closed_list, ch_list) { | |
703 | if (!strcmp(name, ch->name)) { | |
704 | list_del(&ch->ch_list); | |
705 | mutex_unlock(&smd_creation_mutex); | |
706 | return ch; | |
707 | } | |
708 | } | |
709 | mutex_unlock(&smd_creation_mutex); | |
710 | ||
711 | return NULL; | |
712 | } | |
713 | ||
714 | int smd_open(const char *name, smd_channel_t **_ch, | |
715 | void *priv, void (*notify)(void *, unsigned)) | |
716 | { | |
717 | struct smd_channel *ch; | |
718 | unsigned long flags; | |
719 | ||
720 | if (smd_initialized == 0) { | |
721 | pr_info("smd_open() before smd_init()\n"); | |
722 | return -ENODEV; | |
723 | } | |
724 | ||
725 | ch = smd_get_channel(name); | |
726 | if (!ch) | |
727 | return -ENODEV; | |
728 | ||
729 | if (notify == 0) | |
730 | notify = do_nothing_notify; | |
731 | ||
732 | ch->notify = notify; | |
733 | ch->current_packet = 0; | |
734 | ch->last_state = SMD_SS_CLOSED; | |
735 | ch->priv = priv; | |
736 | ||
737 | *_ch = ch; | |
738 | ||
739 | spin_lock_irqsave(&smd_lock, flags); | |
740 | list_add(&ch->ch_list, &smd_ch_list); | |
741 | ||
742 | /* If the remote side is CLOSING, we need to get it to | |
743 | * move to OPENING (which we'll do by moving from CLOSED to | |
744 | * OPENING) and then get it to move from OPENING to | |
745 | * OPENED (by doing the same state change ourselves). | |
746 | * | |
747 | * Otherwise, it should be OPENING and we can move directly | |
748 | * to OPENED so that it will follow. | |
749 | */ | |
750 | if (ch->recv->state == SMD_SS_CLOSING) { | |
751 | ch->send->head = 0; | |
5b0f5a3f | 752 | ch_set_state(ch, SMD_SS_OPENING); |
2eb44eb9 | 753 | } else { |
5b0f5a3f | 754 | ch_set_state(ch, SMD_SS_OPENED); |
2eb44eb9 BS |
755 | } |
756 | spin_unlock_irqrestore(&smd_lock, flags); | |
757 | smd_kick(ch); | |
758 | ||
759 | return 0; | |
760 | } | |
761 | ||
762 | int smd_close(smd_channel_t *ch) | |
763 | { | |
764 | unsigned long flags; | |
765 | ||
766 | pr_info("smd_close(%p)\n", ch); | |
767 | ||
768 | if (ch == 0) | |
769 | return -1; | |
770 | ||
771 | spin_lock_irqsave(&smd_lock, flags); | |
772 | ch->notify = do_nothing_notify; | |
773 | list_del(&ch->ch_list); | |
5b0f5a3f | 774 | ch_set_state(ch, SMD_SS_CLOSED); |
2eb44eb9 BS |
775 | spin_unlock_irqrestore(&smd_lock, flags); |
776 | ||
777 | mutex_lock(&smd_creation_mutex); | |
778 | list_add(&ch->ch_list, &smd_ch_closed_list); | |
779 | mutex_unlock(&smd_creation_mutex); | |
780 | ||
781 | return 0; | |
782 | } | |
783 | ||
784 | int smd_read(smd_channel_t *ch, void *data, int len) | |
785 | { | |
786 | return ch->read(ch, data, len); | |
787 | } | |
788 | ||
789 | int smd_write(smd_channel_t *ch, const void *data, int len) | |
790 | { | |
791 | return ch->write(ch, data, len); | |
792 | } | |
793 | ||
794 | int smd_read_avail(smd_channel_t *ch) | |
795 | { | |
796 | return ch->read_avail(ch); | |
797 | } | |
798 | ||
799 | int smd_write_avail(smd_channel_t *ch) | |
800 | { | |
801 | return ch->write_avail(ch); | |
802 | } | |
803 | ||
804 | int smd_wait_until_readable(smd_channel_t *ch, int bytes) | |
805 | { | |
806 | return -1; | |
807 | } | |
808 | ||
809 | int smd_wait_until_writable(smd_channel_t *ch, int bytes) | |
810 | { | |
811 | return -1; | |
812 | } | |
813 | ||
814 | int smd_cur_packet_size(smd_channel_t *ch) | |
815 | { | |
816 | return ch->current_packet; | |
817 | } | |
818 | ||
819 | ||
820 | /* ------------------------------------------------------------------------- */ | |
821 | ||
822 | void *smem_alloc(unsigned id, unsigned size) | |
823 | { | |
824 | return smem_find(id, size); | |
825 | } | |
826 | ||
03e00cd3 | 827 | void *smem_item(unsigned id, unsigned *size) |
2eb44eb9 BS |
828 | { |
829 | struct smem_shared *shared = (void *) MSM_SHARED_RAM_BASE; | |
830 | struct smem_heap_entry *toc = shared->heap_toc; | |
831 | ||
832 | if (id >= SMEM_NUM_ITEMS) | |
833 | return 0; | |
834 | ||
835 | if (toc[id].allocated) { | |
836 | *size = toc[id].size; | |
837 | return (void *) (MSM_SHARED_RAM_BASE + toc[id].offset); | |
5b0f5a3f BS |
838 | } else { |
839 | *size = 0; | |
2eb44eb9 BS |
840 | } |
841 | ||
842 | return 0; | |
843 | } | |
844 | ||
845 | void *smem_find(unsigned id, unsigned size_in) | |
846 | { | |
847 | unsigned size; | |
848 | void *ptr; | |
849 | ||
5b0f5a3f | 850 | ptr = smem_item(id, &size); |
2eb44eb9 BS |
851 | if (!ptr) |
852 | return 0; | |
853 | ||
854 | size_in = ALIGN(size_in, 8); | |
855 | if (size_in != size) { | |
856 | pr_err("smem_find(%d, %d): wrong size %d\n", | |
857 | id, size_in, size); | |
858 | return 0; | |
859 | } | |
860 | ||
861 | return ptr; | |
862 | } | |
863 | ||
864 | static irqreturn_t smsm_irq_handler(int irq, void *data) | |
865 | { | |
866 | unsigned long flags; | |
5b0f5a3f | 867 | unsigned apps, modm; |
2eb44eb9 BS |
868 | |
869 | spin_lock_irqsave(&smem_lock, flags); | |
2eb44eb9 | 870 | |
28379410 AH |
871 | apps = raw_smsm_get_state(SMSM_STATE_APPS); |
872 | modm = raw_smsm_get_state(SMSM_STATE_MODEM); | |
2eb44eb9 | 873 | |
5b0f5a3f BS |
874 | if (msm_smd_debug_mask & MSM_SMSM_DEBUG) |
875 | pr_info("<SM %08x %08x>\n", apps, modm); | |
876 | if (modm & SMSM_RESET) { | |
877 | handle_modem_crash(); | |
2eb44eb9 | 878 | } |
5b0f5a3f BS |
879 | do_smd_probe(); |
880 | ||
2eb44eb9 BS |
881 | spin_unlock_irqrestore(&smem_lock, flags); |
882 | return IRQ_HANDLED; | |
883 | } | |
884 | ||
28379410 AH |
885 | int smsm_change_state(enum smsm_state_item item, |
886 | uint32_t clear_mask, uint32_t set_mask) | |
2eb44eb9 BS |
887 | { |
888 | unsigned long flags; | |
5b0f5a3f | 889 | unsigned state; |
28379410 | 890 | unsigned addr = smd_info.state + item * 4; |
5b0f5a3f BS |
891 | |
892 | if (!smd_info.ready) | |
893 | return -EIO; | |
2eb44eb9 BS |
894 | |
895 | spin_lock_irqsave(&smem_lock, flags); | |
896 | ||
28379410 | 897 | if (raw_smsm_get_state(SMSM_STATE_MODEM) & SMSM_RESET) |
5b0f5a3f BS |
898 | handle_modem_crash(); |
899 | ||
28379410 AH |
900 | state = (readl(addr) & ~clear_mask) | set_mask; |
901 | writel(state, addr); | |
5b0f5a3f BS |
902 | |
903 | if (msm_smd_debug_mask & MSM_SMSM_DEBUG) | |
28379410 | 904 | pr_info("smsm_change_state %d %x\n", item, state); |
5b0f5a3f | 905 | notify_other_smsm(); |
2eb44eb9 BS |
906 | |
907 | spin_unlock_irqrestore(&smem_lock, flags); | |
908 | ||
2eb44eb9 BS |
909 | return 0; |
910 | } | |
911 | ||
28379410 | 912 | uint32_t smsm_get_state(enum smsm_state_item item) |
2eb44eb9 BS |
913 | { |
914 | unsigned long flags; | |
2eb44eb9 BS |
915 | uint32_t rv; |
916 | ||
917 | spin_lock_irqsave(&smem_lock, flags); | |
918 | ||
28379410 | 919 | rv = readl(smd_info.state + item * 4); |
2eb44eb9 | 920 | |
28379410 | 921 | if (item == SMSM_STATE_MODEM && (rv & SMSM_RESET)) |
2eb44eb9 BS |
922 | handle_modem_crash(); |
923 | ||
924 | spin_unlock_irqrestore(&smem_lock, flags); | |
925 | ||
2eb44eb9 BS |
926 | return rv; |
927 | } | |
928 | ||
ec9d3d14 AH |
929 | #ifdef CONFIG_ARCH_MSM_SCORPION |
930 | ||
2eb44eb9 BS |
931 | int smsm_set_sleep_duration(uint32_t delay) |
932 | { | |
03e00cd3 BS |
933 | struct msm_dem_slave_data *ptr; |
934 | ||
935 | ptr = smem_find(SMEM_APPS_DEM_SLAVE_DATA, sizeof(*ptr)); | |
2eb44eb9 | 936 | if (ptr == NULL) { |
ec9d3d14 | 937 | pr_err("smsm_set_sleep_duration <SM NO APPS_DEM_SLAVE_DATA>\n"); |
2eb44eb9 BS |
938 | return -EIO; |
939 | } | |
940 | if (msm_smd_debug_mask & MSM_SMSM_DEBUG) | |
941 | pr_info("smsm_set_sleep_duration %d -> %d\n", | |
ec9d3d14 AH |
942 | ptr->sleep_time, delay); |
943 | ptr->sleep_time = delay; | |
2eb44eb9 BS |
944 | return 0; |
945 | } | |
946 | ||
ec9d3d14 AH |
947 | #else |
948 | ||
949 | int smsm_set_sleep_duration(uint32_t delay) | |
2eb44eb9 | 950 | { |
ec9d3d14 | 951 | uint32_t *ptr; |
2eb44eb9 | 952 | |
03e00cd3 | 953 | ptr = smem_find(SMEM_SMSM_SLEEP_DELAY, sizeof(*ptr)); |
2eb44eb9 | 954 | if (ptr == NULL) { |
ec9d3d14 | 955 | pr_err("smsm_set_sleep_duration <SM NO SLEEP_DELAY>\n"); |
2eb44eb9 BS |
956 | return -EIO; |
957 | } | |
958 | if (msm_smd_debug_mask & MSM_SMSM_DEBUG) | |
ec9d3d14 AH |
959 | pr_info("smsm_set_sleep_duration %d -> %d\n", |
960 | *ptr, delay); | |
961 | *ptr = delay; | |
2eb44eb9 BS |
962 | return 0; |
963 | } | |
964 | ||
ec9d3d14 AH |
965 | #endif |
966 | ||
2eb44eb9 BS |
967 | int smd_core_init(void) |
968 | { | |
969 | int r; | |
970 | pr_info("smd_core_init()\n"); | |
971 | ||
5b0f5a3f BS |
972 | /* wait for essential items to be initialized */ |
973 | for (;;) { | |
974 | unsigned size; | |
975 | void *state; | |
976 | state = smem_item(SMEM_SMSM_SHARED_STATE, &size); | |
28379410 AH |
977 | if (size == SMSM_V1_SIZE || size == SMSM_V2_SIZE) { |
978 | smd_info.state = (unsigned)state; | |
5b0f5a3f BS |
979 | break; |
980 | } | |
981 | } | |
982 | ||
983 | smd_info.ready = 1; | |
984 | ||
2eb44eb9 BS |
985 | r = request_irq(INT_A9_M2A_0, smd_irq_handler, |
986 | IRQF_TRIGGER_RISING, "smd_dev", 0); | |
987 | if (r < 0) | |
988 | return r; | |
989 | r = enable_irq_wake(INT_A9_M2A_0); | |
990 | if (r < 0) | |
991 | pr_err("smd_core_init: enable_irq_wake failed for A9_M2A_0\n"); | |
992 | ||
993 | r = request_irq(INT_A9_M2A_5, smsm_irq_handler, | |
994 | IRQF_TRIGGER_RISING, "smsm_dev", 0); | |
995 | if (r < 0) { | |
996 | free_irq(INT_A9_M2A_0, 0); | |
997 | return r; | |
998 | } | |
999 | r = enable_irq_wake(INT_A9_M2A_5); | |
1000 | if (r < 0) | |
1001 | pr_err("smd_core_init: enable_irq_wake failed for A9_M2A_5\n"); | |
1002 | ||
5b0f5a3f BS |
1003 | /* check for any SMD channels that may already exist */ |
1004 | do_smd_probe(); | |
1005 | ||
1006 | /* indicate that we're up and running */ | |
28379410 | 1007 | smsm_change_state(SMSM_STATE_APPS, |
ec9d3d14 AH |
1008 | ~0, SMSM_INIT | SMSM_SMDINIT | SMSM_RPCINIT | SMSM_RUN); |
1009 | #ifdef CONFIG_ARCH_MSM_SCORPION | |
1010 | smsm_change_state(SMSM_STATE_APPS_DEM, ~0, 0); | |
1011 | #endif | |
2eb44eb9 BS |
1012 | |
1013 | pr_info("smd_core_init() done\n"); | |
1014 | ||
1015 | return 0; | |
1016 | } | |
1017 | ||
2eb44eb9 BS |
1018 | static int __init msm_smd_probe(struct platform_device *pdev) |
1019 | { | |
1020 | pr_info("smd_init()\n"); | |
1021 | ||
1022 | INIT_WORK(&probe_work, smd_channel_probe_worker); | |
1023 | ||
1024 | if (smd_core_init()) { | |
1025 | pr_err("smd_core_init() failed\n"); | |
1026 | return -1; | |
1027 | } | |
1028 | ||
1029 | do_smd_probe(); | |
1030 | ||
1031 | msm_check_for_modem_crash = check_for_modem_crash; | |
1032 | ||
2eb44eb9 BS |
1033 | smd_initialized = 1; |
1034 | ||
1035 | return 0; | |
1036 | } | |
1037 | ||
1038 | static struct platform_driver msm_smd_driver = { | |
1039 | .probe = msm_smd_probe, | |
1040 | .driver = { | |
1041 | .name = MODULE_NAME, | |
1042 | .owner = THIS_MODULE, | |
1043 | }, | |
1044 | }; | |
1045 | ||
1046 | static int __init msm_smd_init(void) | |
1047 | { | |
1048 | return platform_driver_register(&msm_smd_driver); | |
1049 | } | |
1050 | ||
1051 | module_init(msm_smd_init); | |
1052 | ||
1053 | MODULE_DESCRIPTION("MSM Shared Memory Core"); | |
1054 | MODULE_AUTHOR("Brian Swetland <swetland@google.com>"); | |
1055 | MODULE_LICENSE("GPL"); |