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1 | /* arch/arm/mach-msm/smd.c |
2 | * | |
3 | * Copyright (C) 2007 Google, Inc. | |
4 | * Author: Brian Swetland <swetland@google.com> | |
5 | * | |
6 | * This software is licensed under the terms of the GNU General Public | |
7 | * License version 2, as published by the Free Software Foundation, and | |
8 | * may be copied, distributed, and modified under those terms. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | * GNU General Public License for more details. | |
14 | * | |
15 | */ | |
16 | ||
17 | #include <linux/platform_device.h> | |
18 | #include <linux/module.h> | |
19 | #include <linux/fs.h> | |
20 | #include <linux/cdev.h> | |
21 | #include <linux/device.h> | |
22 | #include <linux/wait.h> | |
23 | #include <linux/interrupt.h> | |
24 | #include <linux/irq.h> | |
25 | #include <linux/list.h> | |
26 | #include <linux/slab.h> | |
27 | #include <linux/debugfs.h> | |
28 | #include <linux/delay.h> | |
2eb44eb9 BS |
29 | |
30 | #include <mach/msm_smd.h> | |
2eb44eb9 BS |
31 | #include <mach/system.h> |
32 | ||
33 | #include "smd_private.h" | |
34 | #include "proc_comm.h" | |
35 | ||
37521a31 BS |
36 | #if defined(CONFIG_ARCH_QSD8X50) |
37 | #define CONFIG_QDSP6 1 | |
38 | #endif | |
39 | ||
2eb44eb9 BS |
40 | void (*msm_hw_reset_hook)(void); |
41 | ||
42 | #define MODULE_NAME "msm_smd" | |
43 | ||
44 | enum { | |
45 | MSM_SMD_DEBUG = 1U << 0, | |
46 | MSM_SMSM_DEBUG = 1U << 0, | |
47 | }; | |
48 | ||
49 | static int msm_smd_debug_mask; | |
50 | ||
03e00cd3 | 51 | struct shared_info { |
5b0f5a3f | 52 | int ready; |
28379410 | 53 | unsigned state; |
5b0f5a3f BS |
54 | }; |
55 | ||
28379410 | 56 | static unsigned dummy_state[SMSM_STATE_COUNT]; |
5b0f5a3f BS |
57 | |
58 | static struct shared_info smd_info = { | |
28379410 | 59 | .state = (unsigned) &dummy_state, |
5b0f5a3f BS |
60 | }; |
61 | ||
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62 | module_param_named(debug_mask, msm_smd_debug_mask, |
63 | int, S_IRUGO | S_IWUSR | S_IWGRP); | |
64 | ||
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65 | static unsigned last_heap_free = 0xffffffff; |
66 | ||
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67 | static inline void notify_other_smsm(void) |
68 | { | |
b42dc44a | 69 | msm_a2m_int(5); |
37521a31 | 70 | #ifdef CONFIG_QDSP6 |
b42dc44a | 71 | msm_a2m_int(8); |
37521a31 | 72 | #endif |
2eb44eb9 BS |
73 | } |
74 | ||
5b0f5a3f | 75 | static inline void notify_modem_smd(void) |
2eb44eb9 | 76 | { |
b42dc44a | 77 | msm_a2m_int(0); |
2eb44eb9 BS |
78 | } |
79 | ||
5b0f5a3f BS |
80 | static inline void notify_dsp_smd(void) |
81 | { | |
b42dc44a | 82 | msm_a2m_int(8); |
5b0f5a3f BS |
83 | } |
84 | ||
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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 | ||
28379410 AH |
111 | uint32_t raw_smsm_get_state(enum smsm_state_item item) |
112 | { | |
113 | return readl(smd_info.state + item * 4); | |
114 | } | |
115 | ||
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116 | static int check_for_modem_crash(void) |
117 | { | |
28379410 | 118 | if (raw_smsm_get_state(SMSM_STATE_MODEM) & SMSM_RESET) { |
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119 | handle_modem_crash(); |
120 | return -1; | |
2eb44eb9 | 121 | } |
5b0f5a3f | 122 | return 0; |
2eb44eb9 BS |
123 | } |
124 | ||
2eb44eb9 | 125 | /* the spinlock is used to synchronize between the |
03e00cd3 BS |
126 | * irq handler and code that mutates the channel |
127 | * list or fiddles with channel state | |
128 | */ | |
129 | DEFINE_SPINLOCK(smd_lock); | |
130 | DEFINE_SPINLOCK(smem_lock); | |
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131 | |
132 | /* the mutex is used during open() and close() | |
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133 | * operations to avoid races while creating or |
134 | * destroying smd_channel structures | |
135 | */ | |
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136 | static DEFINE_MUTEX(smd_creation_mutex); |
137 | ||
138 | static int smd_initialized; | |
139 | ||
03e00cd3 | 140 | LIST_HEAD(smd_ch_closed_list); |
37521a31 BS |
141 | LIST_HEAD(smd_ch_list_modem); |
142 | LIST_HEAD(smd_ch_list_dsp); | |
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143 | |
144 | static unsigned char smd_ch_allocated[64]; | |
145 | static struct work_struct probe_work; | |
146 | ||
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147 | /* how many bytes are available for reading */ |
148 | static int smd_stream_read_avail(struct smd_channel *ch) | |
149 | { | |
5b0f5a3f | 150 | return (ch->recv->head - ch->recv->tail) & ch->fifo_mask; |
2eb44eb9 BS |
151 | } |
152 | ||
153 | /* how many bytes we are free to write */ | |
154 | static int smd_stream_write_avail(struct smd_channel *ch) | |
155 | { | |
5b0f5a3f BS |
156 | return ch->fifo_mask - |
157 | ((ch->send->head - ch->send->tail) & ch->fifo_mask); | |
2eb44eb9 BS |
158 | } |
159 | ||
160 | static int smd_packet_read_avail(struct smd_channel *ch) | |
161 | { | |
162 | if (ch->current_packet) { | |
163 | int n = smd_stream_read_avail(ch); | |
164 | if (n > ch->current_packet) | |
165 | n = ch->current_packet; | |
166 | return n; | |
167 | } else { | |
168 | return 0; | |
169 | } | |
170 | } | |
171 | ||
172 | static int smd_packet_write_avail(struct smd_channel *ch) | |
173 | { | |
174 | int n = smd_stream_write_avail(ch); | |
175 | return n > SMD_HEADER_SIZE ? n - SMD_HEADER_SIZE : 0; | |
176 | } | |
177 | ||
178 | static int ch_is_open(struct smd_channel *ch) | |
179 | { | |
180 | return (ch->recv->state == SMD_SS_OPENED) && | |
181 | (ch->send->state == SMD_SS_OPENED); | |
182 | } | |
183 | ||
184 | /* provide a pointer and length to readable data in the fifo */ | |
185 | static unsigned ch_read_buffer(struct smd_channel *ch, void **ptr) | |
186 | { | |
187 | unsigned head = ch->recv->head; | |
188 | unsigned tail = ch->recv->tail; | |
5b0f5a3f | 189 | *ptr = (void *) (ch->recv_data + tail); |
2eb44eb9 BS |
190 | |
191 | if (tail <= head) | |
192 | return head - tail; | |
193 | else | |
5b0f5a3f | 194 | return ch->fifo_size - tail; |
2eb44eb9 BS |
195 | } |
196 | ||
197 | /* advance the fifo read pointer after data from ch_read_buffer is consumed */ | |
198 | static void ch_read_done(struct smd_channel *ch, unsigned count) | |
199 | { | |
200 | BUG_ON(count > smd_stream_read_avail(ch)); | |
5b0f5a3f | 201 | ch->recv->tail = (ch->recv->tail + count) & ch->fifo_mask; |
7632fba0 | 202 | ch->send->fTAIL = 1; |
2eb44eb9 BS |
203 | } |
204 | ||
205 | /* basic read interface to ch_read_{buffer,done} used | |
03e00cd3 BS |
206 | * by smd_*_read() and update_packet_state() |
207 | * will read-and-discard if the _data pointer is null | |
208 | */ | |
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209 | static int ch_read(struct smd_channel *ch, void *_data, int len) |
210 | { | |
211 | void *ptr; | |
212 | unsigned n; | |
213 | unsigned char *data = _data; | |
214 | int orig_len = len; | |
215 | ||
216 | while (len > 0) { | |
217 | n = ch_read_buffer(ch, &ptr); | |
218 | if (n == 0) | |
219 | break; | |
220 | ||
221 | if (n > len) | |
222 | n = len; | |
223 | if (_data) | |
224 | memcpy(data, ptr, n); | |
225 | ||
226 | data += n; | |
227 | len -= n; | |
228 | ch_read_done(ch, n); | |
229 | } | |
230 | ||
231 | return orig_len - len; | |
232 | } | |
233 | ||
234 | static void update_stream_state(struct smd_channel *ch) | |
235 | { | |
236 | /* streams have no special state requiring updating */ | |
237 | } | |
238 | ||
239 | static void update_packet_state(struct smd_channel *ch) | |
240 | { | |
241 | unsigned hdr[5]; | |
242 | int r; | |
243 | ||
244 | /* can't do anything if we're in the middle of a packet */ | |
245 | if (ch->current_packet != 0) | |
246 | return; | |
247 | ||
248 | /* don't bother unless we can get the full header */ | |
249 | if (smd_stream_read_avail(ch) < SMD_HEADER_SIZE) | |
250 | return; | |
251 | ||
252 | r = ch_read(ch, hdr, SMD_HEADER_SIZE); | |
253 | BUG_ON(r != SMD_HEADER_SIZE); | |
254 | ||
255 | ch->current_packet = hdr[0]; | |
256 | } | |
257 | ||
258 | /* provide a pointer and length to next free space in the fifo */ | |
259 | static unsigned ch_write_buffer(struct smd_channel *ch, void **ptr) | |
260 | { | |
261 | unsigned head = ch->send->head; | |
262 | unsigned tail = ch->send->tail; | |
5b0f5a3f | 263 | *ptr = (void *) (ch->send_data + head); |
2eb44eb9 BS |
264 | |
265 | if (head < tail) { | |
266 | return tail - head - 1; | |
267 | } else { | |
268 | if (tail == 0) | |
5b0f5a3f | 269 | return ch->fifo_size - head - 1; |
2eb44eb9 | 270 | else |
5b0f5a3f | 271 | return ch->fifo_size - head; |
2eb44eb9 BS |
272 | } |
273 | } | |
274 | ||
275 | /* advace the fifo write pointer after freespace | |
276 | * from ch_write_buffer is filled | |
277 | */ | |
278 | static void ch_write_done(struct smd_channel *ch, unsigned count) | |
279 | { | |
280 | BUG_ON(count > smd_stream_write_avail(ch)); | |
5b0f5a3f | 281 | ch->send->head = (ch->send->head + count) & ch->fifo_mask; |
2eb44eb9 BS |
282 | ch->send->fHEAD = 1; |
283 | } | |
284 | ||
5b0f5a3f | 285 | static void ch_set_state(struct smd_channel *ch, unsigned n) |
2eb44eb9 BS |
286 | { |
287 | if (n == SMD_SS_OPENED) { | |
5b0f5a3f BS |
288 | ch->send->fDSR = 1; |
289 | ch->send->fCTS = 1; | |
290 | ch->send->fCD = 1; | |
2eb44eb9 | 291 | } else { |
5b0f5a3f BS |
292 | ch->send->fDSR = 0; |
293 | ch->send->fCTS = 0; | |
294 | ch->send->fCD = 0; | |
2eb44eb9 | 295 | } |
5b0f5a3f BS |
296 | ch->send->state = n; |
297 | ch->send->fSTATE = 1; | |
298 | ch->notify_other_cpu(); | |
2eb44eb9 BS |
299 | } |
300 | ||
301 | static void do_smd_probe(void) | |
302 | { | |
303 | struct smem_shared *shared = (void *) MSM_SHARED_RAM_BASE; | |
304 | if (shared->heap_info.free_offset != last_heap_free) { | |
305 | last_heap_free = shared->heap_info.free_offset; | |
306 | schedule_work(&probe_work); | |
307 | } | |
308 | } | |
309 | ||
310 | static void smd_state_change(struct smd_channel *ch, | |
311 | unsigned last, unsigned next) | |
312 | { | |
313 | ch->last_state = next; | |
314 | ||
03e00cd3 | 315 | pr_info("SMD: ch %d %d -> %d\n", ch->n, last, next); |
2eb44eb9 BS |
316 | |
317 | switch (next) { | |
318 | case SMD_SS_OPENING: | |
319 | ch->recv->tail = 0; | |
320 | case SMD_SS_OPENED: | |
321 | if (ch->send->state != SMD_SS_OPENED) | |
5b0f5a3f | 322 | ch_set_state(ch, SMD_SS_OPENED); |
2eb44eb9 BS |
323 | ch->notify(ch->priv, SMD_EVENT_OPEN); |
324 | break; | |
325 | case SMD_SS_FLUSHING: | |
326 | case SMD_SS_RESET: | |
327 | /* we should force them to close? */ | |
328 | default: | |
329 | ch->notify(ch->priv, SMD_EVENT_CLOSE); | |
330 | } | |
331 | } | |
332 | ||
5b0f5a3f | 333 | static void handle_smd_irq(struct list_head *list, void (*notify)(void)) |
2eb44eb9 BS |
334 | { |
335 | unsigned long flags; | |
336 | struct smd_channel *ch; | |
337 | int do_notify = 0; | |
338 | unsigned ch_flags; | |
339 | unsigned tmp; | |
340 | ||
341 | spin_lock_irqsave(&smd_lock, flags); | |
5b0f5a3f | 342 | list_for_each_entry(ch, list, ch_list) { |
2eb44eb9 BS |
343 | ch_flags = 0; |
344 | if (ch_is_open(ch)) { | |
345 | if (ch->recv->fHEAD) { | |
346 | ch->recv->fHEAD = 0; | |
347 | ch_flags |= 1; | |
348 | do_notify |= 1; | |
349 | } | |
350 | if (ch->recv->fTAIL) { | |
351 | ch->recv->fTAIL = 0; | |
352 | ch_flags |= 2; | |
353 | do_notify |= 1; | |
354 | } | |
355 | if (ch->recv->fSTATE) { | |
356 | ch->recv->fSTATE = 0; | |
357 | ch_flags |= 4; | |
358 | do_notify |= 1; | |
359 | } | |
360 | } | |
361 | tmp = ch->recv->state; | |
362 | if (tmp != ch->last_state) | |
363 | smd_state_change(ch, ch->last_state, tmp); | |
364 | if (ch_flags) { | |
365 | ch->update_state(ch); | |
366 | ch->notify(ch->priv, SMD_EVENT_DATA); | |
367 | } | |
368 | } | |
369 | if (do_notify) | |
5b0f5a3f | 370 | notify(); |
2eb44eb9 BS |
371 | spin_unlock_irqrestore(&smd_lock, flags); |
372 | do_smd_probe(); | |
5b0f5a3f BS |
373 | } |
374 | ||
37521a31 BS |
375 | static irqreturn_t smd_modem_irq_handler(int irq, void *data) |
376 | { | |
377 | handle_smd_irq(&smd_ch_list_modem, notify_modem_smd); | |
378 | return IRQ_HANDLED; | |
379 | } | |
380 | ||
b13525c2 | 381 | #if defined(CONFIG_QDSP6) |
37521a31 | 382 | static irqreturn_t smd_dsp_irq_handler(int irq, void *data) |
5b0f5a3f | 383 | { |
37521a31 | 384 | handle_smd_irq(&smd_ch_list_dsp, notify_dsp_smd); |
2eb44eb9 BS |
385 | return IRQ_HANDLED; |
386 | } | |
b13525c2 | 387 | #endif |
2eb44eb9 BS |
388 | |
389 | static void smd_fake_irq_handler(unsigned long arg) | |
390 | { | |
37521a31 BS |
391 | handle_smd_irq(&smd_ch_list_modem, notify_modem_smd); |
392 | handle_smd_irq(&smd_ch_list_dsp, notify_dsp_smd); | |
2eb44eb9 BS |
393 | } |
394 | ||
395 | static DECLARE_TASKLET(smd_fake_irq_tasklet, smd_fake_irq_handler, 0); | |
396 | ||
37521a31 BS |
397 | static inline int smd_need_int(struct smd_channel *ch) |
398 | { | |
399 | if (ch_is_open(ch)) { | |
400 | if (ch->recv->fHEAD || ch->recv->fTAIL || ch->recv->fSTATE) | |
401 | return 1; | |
402 | if (ch->recv->state != ch->last_state) | |
403 | return 1; | |
404 | } | |
405 | return 0; | |
406 | } | |
407 | ||
2eb44eb9 BS |
408 | void smd_sleep_exit(void) |
409 | { | |
410 | unsigned long flags; | |
411 | struct smd_channel *ch; | |
2eb44eb9 BS |
412 | int need_int = 0; |
413 | ||
414 | spin_lock_irqsave(&smd_lock, flags); | |
37521a31 BS |
415 | list_for_each_entry(ch, &smd_ch_list_modem, ch_list) { |
416 | if (smd_need_int(ch)) { | |
417 | need_int = 1; | |
418 | break; | |
419 | } | |
420 | } | |
421 | list_for_each_entry(ch, &smd_ch_list_dsp, ch_list) { | |
422 | if (smd_need_int(ch)) { | |
423 | need_int = 1; | |
424 | break; | |
2eb44eb9 BS |
425 | } |
426 | } | |
427 | spin_unlock_irqrestore(&smd_lock, flags); | |
428 | do_smd_probe(); | |
37521a31 | 429 | |
2eb44eb9 BS |
430 | if (need_int) { |
431 | if (msm_smd_debug_mask & MSM_SMD_DEBUG) | |
432 | pr_info("smd_sleep_exit need interrupt\n"); | |
433 | tasklet_schedule(&smd_fake_irq_tasklet); | |
434 | } | |
435 | } | |
436 | ||
437 | ||
438 | void smd_kick(smd_channel_t *ch) | |
439 | { | |
440 | unsigned long flags; | |
441 | unsigned tmp; | |
442 | ||
443 | spin_lock_irqsave(&smd_lock, flags); | |
444 | ch->update_state(ch); | |
445 | tmp = ch->recv->state; | |
446 | if (tmp != ch->last_state) { | |
447 | ch->last_state = tmp; | |
448 | if (tmp == SMD_SS_OPENED) | |
449 | ch->notify(ch->priv, SMD_EVENT_OPEN); | |
450 | else | |
451 | ch->notify(ch->priv, SMD_EVENT_CLOSE); | |
452 | } | |
453 | ch->notify(ch->priv, SMD_EVENT_DATA); | |
5b0f5a3f | 454 | ch->notify_other_cpu(); |
2eb44eb9 BS |
455 | spin_unlock_irqrestore(&smd_lock, flags); |
456 | } | |
457 | ||
5b0f5a3f | 458 | static int smd_is_packet(int chn, unsigned type) |
2eb44eb9 | 459 | { |
5b0f5a3f BS |
460 | type &= SMD_KIND_MASK; |
461 | if (type == SMD_KIND_PACKET) | |
462 | return 1; | |
463 | if (type == SMD_KIND_STREAM) | |
464 | return 0; | |
465 | ||
466 | /* older AMSS reports SMD_KIND_UNKNOWN always */ | |
2eb44eb9 BS |
467 | if ((chn > 4) || (chn == 1)) |
468 | return 1; | |
469 | else | |
470 | return 0; | |
471 | } | |
472 | ||
473 | static int smd_stream_write(smd_channel_t *ch, const void *_data, int len) | |
474 | { | |
475 | void *ptr; | |
476 | const unsigned char *buf = _data; | |
477 | unsigned xfer; | |
478 | int orig_len = len; | |
479 | ||
480 | if (len < 0) | |
481 | return -EINVAL; | |
482 | ||
483 | while ((xfer = ch_write_buffer(ch, &ptr)) != 0) { | |
484 | if (!ch_is_open(ch)) | |
485 | break; | |
486 | if (xfer > len) | |
487 | xfer = len; | |
488 | memcpy(ptr, buf, xfer); | |
489 | ch_write_done(ch, xfer); | |
490 | len -= xfer; | |
491 | buf += xfer; | |
492 | if (len == 0) | |
493 | break; | |
494 | } | |
495 | ||
5b0f5a3f | 496 | ch->notify_other_cpu(); |
2eb44eb9 BS |
497 | |
498 | return orig_len - len; | |
499 | } | |
500 | ||
501 | static int smd_packet_write(smd_channel_t *ch, const void *_data, int len) | |
502 | { | |
503 | unsigned hdr[5]; | |
504 | ||
505 | if (len < 0) | |
506 | return -EINVAL; | |
507 | ||
508 | if (smd_stream_write_avail(ch) < (len + SMD_HEADER_SIZE)) | |
509 | return -ENOMEM; | |
510 | ||
511 | hdr[0] = len; | |
512 | hdr[1] = hdr[2] = hdr[3] = hdr[4] = 0; | |
513 | ||
514 | smd_stream_write(ch, hdr, sizeof(hdr)); | |
515 | smd_stream_write(ch, _data, len); | |
516 | ||
517 | return len; | |
518 | } | |
519 | ||
520 | static int smd_stream_read(smd_channel_t *ch, void *data, int len) | |
521 | { | |
522 | int r; | |
523 | ||
524 | if (len < 0) | |
525 | return -EINVAL; | |
526 | ||
527 | r = ch_read(ch, data, len); | |
528 | if (r > 0) | |
5b0f5a3f | 529 | ch->notify_other_cpu(); |
2eb44eb9 BS |
530 | |
531 | return r; | |
532 | } | |
533 | ||
534 | static int smd_packet_read(smd_channel_t *ch, void *data, int len) | |
535 | { | |
536 | unsigned long flags; | |
537 | int r; | |
538 | ||
539 | if (len < 0) | |
540 | return -EINVAL; | |
541 | ||
542 | if (len > ch->current_packet) | |
543 | len = ch->current_packet; | |
544 | ||
545 | r = ch_read(ch, data, len); | |
546 | if (r > 0) | |
5b0f5a3f | 547 | ch->notify_other_cpu(); |
2eb44eb9 BS |
548 | |
549 | spin_lock_irqsave(&smd_lock, flags); | |
550 | ch->current_packet -= r; | |
551 | update_packet_state(ch); | |
552 | spin_unlock_irqrestore(&smd_lock, flags); | |
553 | ||
554 | return r; | |
555 | } | |
556 | ||
34f719b0 | 557 | static int smd_alloc_channel(const char *name, uint32_t cid, uint32_t type) |
5b0f5a3f BS |
558 | { |
559 | struct smd_channel *ch; | |
2eb44eb9 BS |
560 | |
561 | ch = kzalloc(sizeof(struct smd_channel), GFP_KERNEL); | |
562 | if (ch == 0) { | |
563 | pr_err("smd_alloc_channel() out of memory\n"); | |
34f719b0 | 564 | return -1; |
2eb44eb9 | 565 | } |
2eb44eb9 BS |
566 | ch->n = cid; |
567 | ||
bf83de40 | 568 | if (_smd_alloc_channel(ch)) { |
5b0f5a3f | 569 | kfree(ch); |
34f719b0 | 570 | return -1; |
5b0f5a3f BS |
571 | } |
572 | ||
573 | ch->fifo_mask = ch->fifo_size - 1; | |
574 | ch->type = type; | |
575 | ||
576 | if ((type & SMD_TYPE_MASK) == SMD_TYPE_APPS_MODEM) | |
577 | ch->notify_other_cpu = notify_modem_smd; | |
578 | else | |
579 | ch->notify_other_cpu = notify_dsp_smd; | |
580 | ||
581 | if (smd_is_packet(cid, type)) { | |
2eb44eb9 BS |
582 | ch->read = smd_packet_read; |
583 | ch->write = smd_packet_write; | |
584 | ch->read_avail = smd_packet_read_avail; | |
585 | ch->write_avail = smd_packet_write_avail; | |
586 | ch->update_state = update_packet_state; | |
587 | } else { | |
588 | ch->read = smd_stream_read; | |
589 | ch->write = smd_stream_write; | |
590 | ch->read_avail = smd_stream_read_avail; | |
591 | ch->write_avail = smd_stream_write_avail; | |
592 | ch->update_state = update_stream_state; | |
593 | } | |
594 | ||
5b0f5a3f BS |
595 | if ((type & 0xff) == 0) |
596 | memcpy(ch->name, "SMD_", 4); | |
597 | else | |
598 | memcpy(ch->name, "DSP_", 4); | |
2eb44eb9 BS |
599 | memcpy(ch->name + 4, name, 20); |
600 | ch->name[23] = 0; | |
601 | ch->pdev.name = ch->name; | |
602 | ch->pdev.id = -1; | |
603 | ||
5b0f5a3f BS |
604 | pr_info("smd_alloc_channel() cid=%02d size=%05d '%s'\n", |
605 | ch->n, ch->fifo_size, ch->name); | |
2eb44eb9 BS |
606 | |
607 | mutex_lock(&smd_creation_mutex); | |
608 | list_add(&ch->ch_list, &smd_ch_closed_list); | |
609 | mutex_unlock(&smd_creation_mutex); | |
610 | ||
611 | platform_device_register(&ch->pdev); | |
34f719b0 | 612 | return 0; |
2eb44eb9 BS |
613 | } |
614 | ||
3843ac3a DW |
615 | static void smd_channel_probe_worker(struct work_struct *work) |
616 | { | |
617 | struct smd_alloc_elm *shared; | |
618 | unsigned ctype; | |
619 | unsigned type; | |
620 | unsigned n; | |
621 | ||
622 | shared = smem_find(ID_CH_ALLOC_TBL, sizeof(*shared) * 64); | |
623 | if (!shared) { | |
624 | pr_err("smd: cannot find allocation table\n"); | |
625 | return; | |
626 | } | |
627 | for (n = 0; n < 64; n++) { | |
628 | if (smd_ch_allocated[n]) | |
629 | continue; | |
630 | if (!shared[n].ref_count) | |
631 | continue; | |
632 | if (!shared[n].name[0]) | |
633 | continue; | |
634 | ctype = shared[n].ctype; | |
635 | type = ctype & SMD_TYPE_MASK; | |
636 | ||
637 | /* DAL channels are stream but neither the modem, | |
638 | * nor the DSP correctly indicate this. Fixup manually. | |
639 | */ | |
640 | if (!memcmp(shared[n].name, "DAL", 3)) | |
641 | ctype = (ctype & (~SMD_KIND_MASK)) | SMD_KIND_STREAM; | |
642 | ||
643 | type = shared[n].ctype & SMD_TYPE_MASK; | |
644 | if ((type == SMD_TYPE_APPS_MODEM) || | |
645 | (type == SMD_TYPE_APPS_DSP)) | |
646 | if (!smd_alloc_channel(shared[n].name, shared[n].cid, ctype)) | |
647 | smd_ch_allocated[n] = 1; | |
648 | } | |
649 | } | |
650 | ||
2eb44eb9 BS |
651 | static void do_nothing_notify(void *priv, unsigned flags) |
652 | { | |
653 | } | |
654 | ||
655 | struct smd_channel *smd_get_channel(const char *name) | |
656 | { | |
657 | struct smd_channel *ch; | |
658 | ||
659 | mutex_lock(&smd_creation_mutex); | |
660 | list_for_each_entry(ch, &smd_ch_closed_list, ch_list) { | |
661 | if (!strcmp(name, ch->name)) { | |
662 | list_del(&ch->ch_list); | |
663 | mutex_unlock(&smd_creation_mutex); | |
664 | return ch; | |
665 | } | |
666 | } | |
667 | mutex_unlock(&smd_creation_mutex); | |
668 | ||
669 | return NULL; | |
670 | } | |
671 | ||
672 | int smd_open(const char *name, smd_channel_t **_ch, | |
673 | void *priv, void (*notify)(void *, unsigned)) | |
674 | { | |
675 | struct smd_channel *ch; | |
676 | unsigned long flags; | |
677 | ||
678 | if (smd_initialized == 0) { | |
679 | pr_info("smd_open() before smd_init()\n"); | |
680 | return -ENODEV; | |
681 | } | |
682 | ||
683 | ch = smd_get_channel(name); | |
684 | if (!ch) | |
685 | return -ENODEV; | |
686 | ||
687 | if (notify == 0) | |
688 | notify = do_nothing_notify; | |
689 | ||
690 | ch->notify = notify; | |
691 | ch->current_packet = 0; | |
692 | ch->last_state = SMD_SS_CLOSED; | |
693 | ch->priv = priv; | |
694 | ||
695 | *_ch = ch; | |
696 | ||
697 | spin_lock_irqsave(&smd_lock, flags); | |
37521a31 BS |
698 | |
699 | if ((ch->type & SMD_TYPE_MASK) == SMD_TYPE_APPS_MODEM) | |
700 | list_add(&ch->ch_list, &smd_ch_list_modem); | |
701 | else | |
702 | list_add(&ch->ch_list, &smd_ch_list_dsp); | |
2eb44eb9 BS |
703 | |
704 | /* If the remote side is CLOSING, we need to get it to | |
705 | * move to OPENING (which we'll do by moving from CLOSED to | |
706 | * OPENING) and then get it to move from OPENING to | |
707 | * OPENED (by doing the same state change ourselves). | |
708 | * | |
709 | * Otherwise, it should be OPENING and we can move directly | |
710 | * to OPENED so that it will follow. | |
711 | */ | |
712 | if (ch->recv->state == SMD_SS_CLOSING) { | |
713 | ch->send->head = 0; | |
5b0f5a3f | 714 | ch_set_state(ch, SMD_SS_OPENING); |
2eb44eb9 | 715 | } else { |
5b0f5a3f | 716 | ch_set_state(ch, SMD_SS_OPENED); |
2eb44eb9 BS |
717 | } |
718 | spin_unlock_irqrestore(&smd_lock, flags); | |
719 | smd_kick(ch); | |
720 | ||
721 | return 0; | |
722 | } | |
723 | ||
724 | int smd_close(smd_channel_t *ch) | |
725 | { | |
726 | unsigned long flags; | |
727 | ||
728 | pr_info("smd_close(%p)\n", ch); | |
729 | ||
730 | if (ch == 0) | |
731 | return -1; | |
732 | ||
733 | spin_lock_irqsave(&smd_lock, flags); | |
734 | ch->notify = do_nothing_notify; | |
735 | list_del(&ch->ch_list); | |
5b0f5a3f | 736 | ch_set_state(ch, SMD_SS_CLOSED); |
2eb44eb9 BS |
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 | ||
636eb9cb BS |
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 | ||
2eb44eb9 BS |
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 | ||
03e00cd3 | 799 | void *smem_item(unsigned id, unsigned *size) |
2eb44eb9 BS |
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); | |
5b0f5a3f BS |
810 | } else { |
811 | *size = 0; | |
2eb44eb9 BS |
812 | } |
813 | ||
814 | return 0; | |
815 | } | |
816 | ||
817 | void *smem_find(unsigned id, unsigned size_in) | |
818 | { | |
819 | unsigned size; | |
820 | void *ptr; | |
821 | ||
5b0f5a3f | 822 | ptr = smem_item(id, &size); |
2eb44eb9 BS |
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; | |
5b0f5a3f | 839 | unsigned apps, modm; |
2eb44eb9 BS |
840 | |
841 | spin_lock_irqsave(&smem_lock, flags); | |
2eb44eb9 | 842 | |
28379410 AH |
843 | apps = raw_smsm_get_state(SMSM_STATE_APPS); |
844 | modm = raw_smsm_get_state(SMSM_STATE_MODEM); | |
2eb44eb9 | 845 | |
5b0f5a3f BS |
846 | if (msm_smd_debug_mask & MSM_SMSM_DEBUG) |
847 | pr_info("<SM %08x %08x>\n", apps, modm); | |
79848a2a | 848 | if (modm & SMSM_RESET) |
5b0f5a3f | 849 | handle_modem_crash(); |
79848a2a | 850 | |
5b0f5a3f BS |
851 | do_smd_probe(); |
852 | ||
2eb44eb9 BS |
853 | spin_unlock_irqrestore(&smem_lock, flags); |
854 | return IRQ_HANDLED; | |
855 | } | |
856 | ||
28379410 AH |
857 | int smsm_change_state(enum smsm_state_item item, |
858 | uint32_t clear_mask, uint32_t set_mask) | |
2eb44eb9 | 859 | { |
1a86fbc1 | 860 | unsigned long addr = smd_info.state + item * 4; |
2eb44eb9 | 861 | unsigned long flags; |
5b0f5a3f BS |
862 | unsigned state; |
863 | ||
864 | if (!smd_info.ready) | |
865 | return -EIO; | |
2eb44eb9 BS |
866 | |
867 | spin_lock_irqsave(&smem_lock, flags); | |
868 | ||
28379410 | 869 | if (raw_smsm_get_state(SMSM_STATE_MODEM) & SMSM_RESET) |
5b0f5a3f BS |
870 | handle_modem_crash(); |
871 | ||
28379410 AH |
872 | state = (readl(addr) & ~clear_mask) | set_mask; |
873 | writel(state, addr); | |
5b0f5a3f BS |
874 | |
875 | if (msm_smd_debug_mask & MSM_SMSM_DEBUG) | |
28379410 | 876 | pr_info("smsm_change_state %d %x\n", item, state); |
5b0f5a3f | 877 | notify_other_smsm(); |
2eb44eb9 BS |
878 | |
879 | spin_unlock_irqrestore(&smem_lock, flags); | |
880 | ||
2eb44eb9 BS |
881 | return 0; |
882 | } | |
883 | ||
28379410 | 884 | uint32_t smsm_get_state(enum smsm_state_item item) |
2eb44eb9 BS |
885 | { |
886 | unsigned long flags; | |
2eb44eb9 BS |
887 | uint32_t rv; |
888 | ||
889 | spin_lock_irqsave(&smem_lock, flags); | |
890 | ||
28379410 | 891 | rv = readl(smd_info.state + item * 4); |
2eb44eb9 | 892 | |
28379410 | 893 | if (item == SMSM_STATE_MODEM && (rv & SMSM_RESET)) |
2eb44eb9 BS |
894 | handle_modem_crash(); |
895 | ||
896 | spin_unlock_irqrestore(&smem_lock, flags); | |
897 | ||
2eb44eb9 BS |
898 | return rv; |
899 | } | |
900 | ||
ec9d3d14 AH |
901 | #ifdef CONFIG_ARCH_MSM_SCORPION |
902 | ||
2eb44eb9 BS |
903 | int smsm_set_sleep_duration(uint32_t delay) |
904 | { | |
03e00cd3 BS |
905 | struct msm_dem_slave_data *ptr; |
906 | ||
907 | ptr = smem_find(SMEM_APPS_DEM_SLAVE_DATA, sizeof(*ptr)); | |
2eb44eb9 | 908 | if (ptr == NULL) { |
ec9d3d14 | 909 | pr_err("smsm_set_sleep_duration <SM NO APPS_DEM_SLAVE_DATA>\n"); |
2eb44eb9 BS |
910 | return -EIO; |
911 | } | |
912 | if (msm_smd_debug_mask & MSM_SMSM_DEBUG) | |
913 | pr_info("smsm_set_sleep_duration %d -> %d\n", | |
ec9d3d14 AH |
914 | ptr->sleep_time, delay); |
915 | ptr->sleep_time = delay; | |
2eb44eb9 BS |
916 | return 0; |
917 | } | |
918 | ||
ec9d3d14 AH |
919 | #else |
920 | ||
921 | int smsm_set_sleep_duration(uint32_t delay) | |
2eb44eb9 | 922 | { |
ec9d3d14 | 923 | uint32_t *ptr; |
2eb44eb9 | 924 | |
03e00cd3 | 925 | ptr = smem_find(SMEM_SMSM_SLEEP_DELAY, sizeof(*ptr)); |
2eb44eb9 | 926 | if (ptr == NULL) { |
ec9d3d14 | 927 | pr_err("smsm_set_sleep_duration <SM NO SLEEP_DELAY>\n"); |
2eb44eb9 BS |
928 | return -EIO; |
929 | } | |
930 | if (msm_smd_debug_mask & MSM_SMSM_DEBUG) | |
ec9d3d14 AH |
931 | pr_info("smsm_set_sleep_duration %d -> %d\n", |
932 | *ptr, delay); | |
933 | *ptr = delay; | |
2eb44eb9 BS |
934 | return 0; |
935 | } | |
936 | ||
ec9d3d14 AH |
937 | #endif |
938 | ||
2eb44eb9 BS |
939 | int smd_core_init(void) |
940 | { | |
941 | int r; | |
942 | pr_info("smd_core_init()\n"); | |
943 | ||
5b0f5a3f BS |
944 | /* wait for essential items to be initialized */ |
945 | for (;;) { | |
946 | unsigned size; | |
947 | void *state; | |
948 | state = smem_item(SMEM_SMSM_SHARED_STATE, &size); | |
28379410 AH |
949 | if (size == SMSM_V1_SIZE || size == SMSM_V2_SIZE) { |
950 | smd_info.state = (unsigned)state; | |
5b0f5a3f BS |
951 | break; |
952 | } | |
953 | } | |
954 | ||
955 | smd_info.ready = 1; | |
956 | ||
37521a31 | 957 | r = request_irq(INT_A9_M2A_0, smd_modem_irq_handler, |
2eb44eb9 BS |
958 | IRQF_TRIGGER_RISING, "smd_dev", 0); |
959 | if (r < 0) | |
960 | return r; | |
961 | r = enable_irq_wake(INT_A9_M2A_0); | |
962 | if (r < 0) | |
963 | pr_err("smd_core_init: enable_irq_wake failed for A9_M2A_0\n"); | |
964 | ||
965 | r = request_irq(INT_A9_M2A_5, smsm_irq_handler, | |
966 | IRQF_TRIGGER_RISING, "smsm_dev", 0); | |
967 | if (r < 0) { | |
968 | free_irq(INT_A9_M2A_0, 0); | |
969 | return r; | |
970 | } | |
971 | r = enable_irq_wake(INT_A9_M2A_5); | |
972 | if (r < 0) | |
973 | pr_err("smd_core_init: enable_irq_wake failed for A9_M2A_5\n"); | |
974 | ||
37521a31 BS |
975 | #if defined(CONFIG_QDSP6) |
976 | r = request_irq(INT_ADSP_A11, smd_dsp_irq_handler, | |
977 | IRQF_TRIGGER_RISING, "smd_dsp", 0); | |
978 | if (r < 0) { | |
979 | free_irq(INT_A9_M2A_0, 0); | |
980 | free_irq(INT_A9_M2A_5, 0); | |
981 | return r; | |
982 | } | |
983 | #endif | |
984 | ||
5b0f5a3f BS |
985 | /* check for any SMD channels that may already exist */ |
986 | do_smd_probe(); | |
987 | ||
988 | /* indicate that we're up and running */ | |
28379410 | 989 | smsm_change_state(SMSM_STATE_APPS, |
ec9d3d14 AH |
990 | ~0, SMSM_INIT | SMSM_SMDINIT | SMSM_RPCINIT | SMSM_RUN); |
991 | #ifdef CONFIG_ARCH_MSM_SCORPION | |
992 | smsm_change_state(SMSM_STATE_APPS_DEM, ~0, 0); | |
993 | #endif | |
2eb44eb9 BS |
994 | |
995 | pr_info("smd_core_init() done\n"); | |
996 | ||
997 | return 0; | |
998 | } | |
999 | ||
2eb44eb9 BS |
1000 | static int __init msm_smd_probe(struct platform_device *pdev) |
1001 | { | |
1002 | pr_info("smd_init()\n"); | |
1003 | ||
1004 | INIT_WORK(&probe_work, smd_channel_probe_worker); | |
1005 | ||
1006 | if (smd_core_init()) { | |
1007 | pr_err("smd_core_init() failed\n"); | |
1008 | return -1; | |
1009 | } | |
1010 | ||
1011 | do_smd_probe(); | |
1012 | ||
1013 | msm_check_for_modem_crash = check_for_modem_crash; | |
1014 | ||
1207babd IM |
1015 | msm_init_last_radio_log(THIS_MODULE); |
1016 | ||
2eb44eb9 BS |
1017 | smd_initialized = 1; |
1018 | ||
1019 | return 0; | |
1020 | } | |
1021 | ||
1022 | static struct platform_driver msm_smd_driver = { | |
1023 | .probe = msm_smd_probe, | |
1024 | .driver = { | |
1025 | .name = MODULE_NAME, | |
1026 | .owner = THIS_MODULE, | |
1027 | }, | |
1028 | }; | |
1029 | ||
1030 | static int __init msm_smd_init(void) | |
1031 | { | |
1032 | return platform_driver_register(&msm_smd_driver); | |
1033 | } | |
1034 | ||
1035 | module_init(msm_smd_init); | |
1036 | ||
1037 | MODULE_DESCRIPTION("MSM Shared Memory Core"); | |
1038 | MODULE_AUTHOR("Brian Swetland <swetland@google.com>"); | |
1039 | MODULE_LICENSE("GPL"); |