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7f62fe8a KV |
1 | /* |
2 | * cmt_speech.c - HSI CMT speech driver | |
3 | * | |
4 | * Copyright (C) 2008,2009,2010 Nokia Corporation. All rights reserved. | |
5 | * | |
6 | * Contact: Kai Vehmanen <kai.vehmanen@nokia.com> | |
7 | * Original author: Peter Ujfalusi <peter.ujfalusi@nokia.com> | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or | |
10 | * modify it under the terms of the GNU General Public License | |
11 | * version 2 as published by the Free Software Foundation. | |
12 | * | |
13 | * This program is distributed in the hope that it will be useful, but | |
14 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | * General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU General Public License | |
19 | * along with this program; if not, write to the Free Software | |
20 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA | |
21 | * 02110-1301 USA | |
22 | */ | |
23 | ||
24 | #include <linux/errno.h> | |
25 | #include <linux/module.h> | |
26 | #include <linux/types.h> | |
27 | #include <linux/init.h> | |
28 | #include <linux/device.h> | |
29 | #include <linux/miscdevice.h> | |
30 | #include <linux/mm.h> | |
31 | #include <linux/slab.h> | |
32 | #include <linux/fs.h> | |
33 | #include <linux/poll.h> | |
34 | #include <linux/sched.h> | |
35 | #include <linux/ioctl.h> | |
36 | #include <linux/uaccess.h> | |
37 | #include <linux/pm_qos.h> | |
38 | #include <linux/hsi/hsi.h> | |
39 | #include <linux/hsi/ssi_protocol.h> | |
40 | #include <linux/hsi/cs-protocol.h> | |
41 | ||
42 | #define CS_MMAP_SIZE PAGE_SIZE | |
43 | ||
44 | struct char_queue { | |
45 | struct list_head list; | |
46 | u32 msg; | |
47 | }; | |
48 | ||
49 | struct cs_char { | |
50 | unsigned int opened; | |
51 | struct hsi_client *cl; | |
52 | struct cs_hsi_iface *hi; | |
53 | struct list_head chardev_queue; | |
54 | struct list_head dataind_queue; | |
55 | int dataind_pending; | |
56 | /* mmap things */ | |
57 | unsigned long mmap_base; | |
58 | unsigned long mmap_size; | |
59 | spinlock_t lock; | |
60 | struct fasync_struct *async_queue; | |
61 | wait_queue_head_t wait; | |
62 | /* hsi channel ids */ | |
63 | int channel_id_cmd; | |
64 | int channel_id_data; | |
65 | }; | |
66 | ||
67 | #define SSI_CHANNEL_STATE_READING 1 | |
68 | #define SSI_CHANNEL_STATE_WRITING (1 << 1) | |
69 | #define SSI_CHANNEL_STATE_POLL (1 << 2) | |
70 | #define SSI_CHANNEL_STATE_ERROR (1 << 3) | |
71 | ||
72 | #define TARGET_MASK 0xf000000 | |
73 | #define TARGET_REMOTE (1 << CS_DOMAIN_SHIFT) | |
74 | #define TARGET_LOCAL 0 | |
75 | ||
76 | /* Number of pre-allocated commands buffers */ | |
77 | #define CS_MAX_CMDS 4 | |
78 | ||
79 | /* | |
80 | * During data transfers, transactions must be handled | |
81 | * within 20ms (fixed value in cmtspeech HSI protocol) | |
82 | */ | |
83 | #define CS_QOS_LATENCY_FOR_DATA_USEC 20000 | |
84 | ||
85 | /* Timeout to wait for pending HSI transfers to complete */ | |
86 | #define CS_HSI_TRANSFER_TIMEOUT_MS 500 | |
87 | ||
88 | ||
89 | #define RX_PTR_BOUNDARY_SHIFT 8 | |
90 | #define RX_PTR_MAX_SHIFT (RX_PTR_BOUNDARY_SHIFT + \ | |
91 | CS_MAX_BUFFERS_SHIFT) | |
92 | struct cs_hsi_iface { | |
93 | struct hsi_client *cl; | |
94 | struct hsi_client *master; | |
95 | ||
96 | unsigned int iface_state; | |
97 | unsigned int wakeline_state; | |
98 | unsigned int control_state; | |
99 | unsigned int data_state; | |
100 | ||
101 | /* state exposed to application */ | |
102 | struct cs_mmap_config_block *mmap_cfg; | |
103 | ||
104 | unsigned long mmap_base; | |
105 | unsigned long mmap_size; | |
106 | ||
107 | unsigned int rx_slot; | |
108 | unsigned int tx_slot; | |
109 | ||
110 | /* note: for security reasons, we do not trust the contents of | |
111 | * mmap_cfg, but instead duplicate the variables here */ | |
112 | unsigned int buf_size; | |
113 | unsigned int rx_bufs; | |
114 | unsigned int tx_bufs; | |
115 | unsigned int rx_ptr_boundary; | |
116 | unsigned int rx_offsets[CS_MAX_BUFFERS]; | |
117 | unsigned int tx_offsets[CS_MAX_BUFFERS]; | |
118 | ||
119 | /* size of aligned memory blocks */ | |
120 | unsigned int slot_size; | |
121 | unsigned int flags; | |
122 | ||
123 | struct list_head cmdqueue; | |
124 | ||
125 | struct hsi_msg *data_rx_msg; | |
126 | struct hsi_msg *data_tx_msg; | |
127 | wait_queue_head_t datawait; | |
128 | ||
129 | struct pm_qos_request pm_qos_req; | |
130 | ||
131 | spinlock_t lock; | |
132 | }; | |
133 | ||
134 | static struct cs_char cs_char_data; | |
135 | ||
136 | static void cs_hsi_read_on_control(struct cs_hsi_iface *hi); | |
137 | static void cs_hsi_read_on_data(struct cs_hsi_iface *hi); | |
138 | ||
139 | static inline void rx_ptr_shift_too_big(void) | |
140 | { | |
141 | BUILD_BUG_ON((1LLU << RX_PTR_MAX_SHIFT) > UINT_MAX); | |
142 | } | |
143 | ||
144 | static void cs_notify(u32 message, struct list_head *head) | |
145 | { | |
146 | struct char_queue *entry; | |
147 | ||
148 | spin_lock(&cs_char_data.lock); | |
149 | ||
150 | if (!cs_char_data.opened) { | |
151 | spin_unlock(&cs_char_data.lock); | |
152 | goto out; | |
153 | } | |
154 | ||
155 | entry = kmalloc(sizeof(*entry), GFP_ATOMIC); | |
156 | if (!entry) { | |
157 | dev_err(&cs_char_data.cl->device, | |
158 | "Can't allocate new entry for the queue.\n"); | |
159 | spin_unlock(&cs_char_data.lock); | |
160 | goto out; | |
161 | } | |
162 | ||
163 | entry->msg = message; | |
164 | list_add_tail(&entry->list, head); | |
165 | ||
166 | spin_unlock(&cs_char_data.lock); | |
167 | ||
168 | wake_up_interruptible(&cs_char_data.wait); | |
169 | kill_fasync(&cs_char_data.async_queue, SIGIO, POLL_IN); | |
170 | ||
171 | out: | |
172 | return; | |
173 | } | |
174 | ||
175 | static u32 cs_pop_entry(struct list_head *head) | |
176 | { | |
177 | struct char_queue *entry; | |
178 | u32 data; | |
179 | ||
180 | entry = list_entry(head->next, struct char_queue, list); | |
181 | data = entry->msg; | |
182 | list_del(&entry->list); | |
183 | kfree(entry); | |
184 | ||
185 | return data; | |
186 | } | |
187 | ||
188 | static void cs_notify_control(u32 message) | |
189 | { | |
190 | cs_notify(message, &cs_char_data.chardev_queue); | |
191 | } | |
192 | ||
193 | static void cs_notify_data(u32 message, int maxlength) | |
194 | { | |
195 | cs_notify(message, &cs_char_data.dataind_queue); | |
196 | ||
197 | spin_lock(&cs_char_data.lock); | |
198 | cs_char_data.dataind_pending++; | |
199 | while (cs_char_data.dataind_pending > maxlength && | |
200 | !list_empty(&cs_char_data.dataind_queue)) { | |
201 | dev_dbg(&cs_char_data.cl->device, "data notification " | |
202 | "queue overrun (%u entries)\n", cs_char_data.dataind_pending); | |
203 | ||
204 | cs_pop_entry(&cs_char_data.dataind_queue); | |
205 | cs_char_data.dataind_pending--; | |
206 | } | |
207 | spin_unlock(&cs_char_data.lock); | |
208 | } | |
209 | ||
210 | static inline void cs_set_cmd(struct hsi_msg *msg, u32 cmd) | |
211 | { | |
212 | u32 *data = sg_virt(msg->sgt.sgl); | |
213 | *data = cmd; | |
214 | } | |
215 | ||
216 | static inline u32 cs_get_cmd(struct hsi_msg *msg) | |
217 | { | |
218 | u32 *data = sg_virt(msg->sgt.sgl); | |
219 | return *data; | |
220 | } | |
221 | ||
222 | static void cs_release_cmd(struct hsi_msg *msg) | |
223 | { | |
224 | struct cs_hsi_iface *hi = msg->context; | |
225 | ||
226 | list_add_tail(&msg->link, &hi->cmdqueue); | |
227 | } | |
228 | ||
229 | static void cs_cmd_destructor(struct hsi_msg *msg) | |
230 | { | |
231 | struct cs_hsi_iface *hi = msg->context; | |
232 | ||
233 | spin_lock(&hi->lock); | |
234 | ||
235 | dev_dbg(&cs_char_data.cl->device, "control cmd destructor\n"); | |
236 | ||
237 | if (hi->iface_state != CS_STATE_CLOSED) | |
238 | dev_err(&hi->cl->device, "Cmd flushed while driver active\n"); | |
239 | ||
240 | if (msg->ttype == HSI_MSG_READ) | |
241 | hi->control_state &= | |
242 | ~(SSI_CHANNEL_STATE_POLL | SSI_CHANNEL_STATE_READING); | |
243 | else if (msg->ttype == HSI_MSG_WRITE && | |
244 | hi->control_state & SSI_CHANNEL_STATE_WRITING) | |
245 | hi->control_state &= ~SSI_CHANNEL_STATE_WRITING; | |
246 | ||
247 | cs_release_cmd(msg); | |
248 | ||
249 | spin_unlock(&hi->lock); | |
250 | } | |
251 | ||
252 | static struct hsi_msg *cs_claim_cmd(struct cs_hsi_iface* ssi) | |
253 | { | |
254 | struct hsi_msg *msg; | |
255 | ||
256 | BUG_ON(list_empty(&ssi->cmdqueue)); | |
257 | ||
258 | msg = list_first_entry(&ssi->cmdqueue, struct hsi_msg, link); | |
259 | list_del(&msg->link); | |
260 | msg->destructor = cs_cmd_destructor; | |
261 | ||
262 | return msg; | |
263 | } | |
264 | ||
265 | static void cs_free_cmds(struct cs_hsi_iface *ssi) | |
266 | { | |
267 | struct hsi_msg *msg, *tmp; | |
268 | ||
269 | list_for_each_entry_safe(msg, tmp, &ssi->cmdqueue, link) { | |
270 | list_del(&msg->link); | |
271 | msg->destructor = NULL; | |
272 | kfree(sg_virt(msg->sgt.sgl)); | |
273 | hsi_free_msg(msg); | |
274 | } | |
275 | } | |
276 | ||
277 | static int cs_alloc_cmds(struct cs_hsi_iface *hi) | |
278 | { | |
279 | struct hsi_msg *msg; | |
280 | u32 *buf; | |
281 | unsigned int i; | |
282 | ||
283 | INIT_LIST_HEAD(&hi->cmdqueue); | |
284 | ||
285 | for (i = 0; i < CS_MAX_CMDS; i++) { | |
286 | msg = hsi_alloc_msg(1, GFP_KERNEL); | |
287 | if (!msg) | |
288 | goto out; | |
289 | buf = kmalloc(sizeof(*buf), GFP_KERNEL); | |
290 | if (!buf) { | |
291 | hsi_free_msg(msg); | |
292 | goto out; | |
293 | } | |
294 | sg_init_one(msg->sgt.sgl, buf, sizeof(*buf)); | |
295 | msg->channel = cs_char_data.channel_id_cmd; | |
296 | msg->context = hi; | |
297 | list_add_tail(&msg->link, &hi->cmdqueue); | |
298 | } | |
299 | ||
300 | return 0; | |
301 | ||
302 | out: | |
303 | cs_free_cmds(hi); | |
304 | return -ENOMEM; | |
305 | } | |
306 | ||
307 | static void cs_hsi_data_destructor(struct hsi_msg *msg) | |
308 | { | |
309 | struct cs_hsi_iface *hi = msg->context; | |
310 | const char *dir = (msg->ttype == HSI_MSG_READ) ? "TX" : "RX"; | |
311 | ||
312 | dev_dbg(&cs_char_data.cl->device, "Freeing data %s message\n", dir); | |
313 | ||
314 | spin_lock(&hi->lock); | |
315 | if (hi->iface_state != CS_STATE_CLOSED) | |
316 | dev_err(&cs_char_data.cl->device, | |
317 | "Data %s flush while device active\n", dir); | |
318 | if (msg->ttype == HSI_MSG_READ) | |
319 | hi->data_state &= | |
320 | ~(SSI_CHANNEL_STATE_POLL | SSI_CHANNEL_STATE_READING); | |
321 | else | |
322 | hi->data_state &= ~SSI_CHANNEL_STATE_WRITING; | |
323 | ||
324 | msg->status = HSI_STATUS_COMPLETED; | |
325 | if (unlikely(waitqueue_active(&hi->datawait))) | |
326 | wake_up_interruptible(&hi->datawait); | |
327 | ||
328 | spin_unlock(&hi->lock); | |
329 | } | |
330 | ||
331 | static int cs_hsi_alloc_data(struct cs_hsi_iface *hi) | |
332 | { | |
333 | struct hsi_msg *txmsg, *rxmsg; | |
334 | int res = 0; | |
335 | ||
336 | rxmsg = hsi_alloc_msg(1, GFP_KERNEL); | |
337 | if (!rxmsg) { | |
338 | res = -ENOMEM; | |
339 | goto out1; | |
340 | } | |
341 | rxmsg->channel = cs_char_data.channel_id_data; | |
342 | rxmsg->destructor = cs_hsi_data_destructor; | |
343 | rxmsg->context = hi; | |
344 | ||
345 | txmsg = hsi_alloc_msg(1, GFP_KERNEL); | |
346 | if (!txmsg) { | |
347 | res = -ENOMEM; | |
348 | goto out2; | |
349 | } | |
350 | txmsg->channel = cs_char_data.channel_id_data; | |
351 | txmsg->destructor = cs_hsi_data_destructor; | |
352 | txmsg->context = hi; | |
353 | ||
354 | hi->data_rx_msg = rxmsg; | |
355 | hi->data_tx_msg = txmsg; | |
356 | ||
357 | return 0; | |
358 | ||
359 | out2: | |
360 | hsi_free_msg(rxmsg); | |
361 | out1: | |
362 | return res; | |
363 | } | |
364 | ||
365 | static void cs_hsi_free_data_msg(struct hsi_msg *msg) | |
366 | { | |
367 | WARN_ON(msg->status != HSI_STATUS_COMPLETED && | |
368 | msg->status != HSI_STATUS_ERROR); | |
369 | hsi_free_msg(msg); | |
370 | } | |
371 | ||
372 | static void cs_hsi_free_data(struct cs_hsi_iface *hi) | |
373 | { | |
374 | cs_hsi_free_data_msg(hi->data_rx_msg); | |
375 | cs_hsi_free_data_msg(hi->data_tx_msg); | |
376 | } | |
377 | ||
378 | static inline void __cs_hsi_error_pre(struct cs_hsi_iface *hi, | |
379 | struct hsi_msg *msg, const char *info, | |
380 | unsigned int *state) | |
381 | { | |
382 | spin_lock(&hi->lock); | |
383 | dev_err(&hi->cl->device, "HSI %s error, msg %d, state %u\n", | |
384 | info, msg->status, *state); | |
385 | } | |
386 | ||
387 | static inline void __cs_hsi_error_post(struct cs_hsi_iface *hi) | |
388 | { | |
389 | spin_unlock(&hi->lock); | |
390 | } | |
391 | ||
392 | static inline void __cs_hsi_error_read_bits(unsigned int *state) | |
393 | { | |
394 | *state |= SSI_CHANNEL_STATE_ERROR; | |
395 | *state &= ~(SSI_CHANNEL_STATE_READING | SSI_CHANNEL_STATE_POLL); | |
396 | } | |
397 | ||
398 | static inline void __cs_hsi_error_write_bits(unsigned int *state) | |
399 | { | |
400 | *state |= SSI_CHANNEL_STATE_ERROR; | |
401 | *state &= ~SSI_CHANNEL_STATE_WRITING; | |
402 | } | |
403 | ||
404 | static void cs_hsi_control_read_error(struct cs_hsi_iface *hi, | |
405 | struct hsi_msg *msg) | |
406 | { | |
407 | __cs_hsi_error_pre(hi, msg, "control read", &hi->control_state); | |
408 | cs_release_cmd(msg); | |
409 | __cs_hsi_error_read_bits(&hi->control_state); | |
410 | __cs_hsi_error_post(hi); | |
411 | } | |
412 | ||
413 | static void cs_hsi_control_write_error(struct cs_hsi_iface *hi, | |
414 | struct hsi_msg *msg) | |
415 | { | |
416 | __cs_hsi_error_pre(hi, msg, "control write", &hi->control_state); | |
417 | cs_release_cmd(msg); | |
418 | __cs_hsi_error_write_bits(&hi->control_state); | |
419 | __cs_hsi_error_post(hi); | |
420 | ||
421 | } | |
422 | ||
423 | static void cs_hsi_data_read_error(struct cs_hsi_iface *hi, struct hsi_msg *msg) | |
424 | { | |
425 | __cs_hsi_error_pre(hi, msg, "data read", &hi->data_state); | |
426 | __cs_hsi_error_read_bits(&hi->data_state); | |
427 | __cs_hsi_error_post(hi); | |
428 | } | |
429 | ||
430 | static void cs_hsi_data_write_error(struct cs_hsi_iface *hi, | |
431 | struct hsi_msg *msg) | |
432 | { | |
433 | __cs_hsi_error_pre(hi, msg, "data write", &hi->data_state); | |
434 | __cs_hsi_error_write_bits(&hi->data_state); | |
435 | __cs_hsi_error_post(hi); | |
436 | } | |
437 | ||
438 | static void cs_hsi_read_on_control_complete(struct hsi_msg *msg) | |
439 | { | |
440 | u32 cmd = cs_get_cmd(msg); | |
441 | struct cs_hsi_iface *hi = msg->context; | |
442 | ||
443 | spin_lock(&hi->lock); | |
444 | hi->control_state &= ~SSI_CHANNEL_STATE_READING; | |
445 | if (msg->status == HSI_STATUS_ERROR) { | |
446 | dev_err(&hi->cl->device, "Control RX error detected\n"); | |
447 | cs_hsi_control_read_error(hi, msg); | |
448 | spin_unlock(&hi->lock); | |
449 | goto out; | |
450 | } | |
451 | dev_dbg(&hi->cl->device, "Read on control: %08X\n", cmd); | |
452 | cs_release_cmd(msg); | |
453 | if (hi->flags & CS_FEAT_TSTAMP_RX_CTRL) { | |
5023a5ca SR |
454 | struct timespec tspec; |
455 | struct cs_timestamp *tstamp = | |
7f62fe8a | 456 | &hi->mmap_cfg->tstamp_rx_ctrl; |
5023a5ca SR |
457 | |
458 | ktime_get_ts(&tspec); | |
459 | ||
460 | tstamp->tv_sec = (__u32) tspec.tv_sec; | |
461 | tstamp->tv_nsec = (__u32) tspec.tv_nsec; | |
7f62fe8a KV |
462 | } |
463 | spin_unlock(&hi->lock); | |
464 | ||
465 | cs_notify_control(cmd); | |
466 | ||
467 | out: | |
468 | cs_hsi_read_on_control(hi); | |
469 | } | |
470 | ||
471 | static void cs_hsi_peek_on_control_complete(struct hsi_msg *msg) | |
472 | { | |
473 | struct cs_hsi_iface *hi = msg->context; | |
474 | int ret; | |
475 | ||
476 | if (msg->status == HSI_STATUS_ERROR) { | |
477 | dev_err(&hi->cl->device, "Control peek RX error detected\n"); | |
478 | cs_hsi_control_read_error(hi, msg); | |
479 | return; | |
480 | } | |
481 | ||
482 | WARN_ON(!(hi->control_state & SSI_CHANNEL_STATE_READING)); | |
483 | ||
484 | dev_dbg(&hi->cl->device, "Peek on control complete, reading\n"); | |
485 | msg->sgt.nents = 1; | |
486 | msg->complete = cs_hsi_read_on_control_complete; | |
487 | ret = hsi_async_read(hi->cl, msg); | |
488 | if (ret) | |
489 | cs_hsi_control_read_error(hi, msg); | |
490 | } | |
491 | ||
492 | static void cs_hsi_read_on_control(struct cs_hsi_iface *hi) | |
493 | { | |
494 | struct hsi_msg *msg; | |
495 | int ret; | |
496 | ||
497 | spin_lock(&hi->lock); | |
498 | if (hi->control_state & SSI_CHANNEL_STATE_READING) { | |
499 | dev_err(&hi->cl->device, "Control read already pending (%d)\n", | |
500 | hi->control_state); | |
501 | spin_unlock(&hi->lock); | |
502 | return; | |
503 | } | |
504 | if (hi->control_state & SSI_CHANNEL_STATE_ERROR) { | |
505 | dev_err(&hi->cl->device, "Control read error (%d)\n", | |
506 | hi->control_state); | |
507 | spin_unlock(&hi->lock); | |
508 | return; | |
509 | } | |
510 | hi->control_state |= SSI_CHANNEL_STATE_READING; | |
511 | dev_dbg(&hi->cl->device, "Issuing RX on control\n"); | |
512 | msg = cs_claim_cmd(hi); | |
513 | spin_unlock(&hi->lock); | |
514 | ||
515 | msg->sgt.nents = 0; | |
516 | msg->complete = cs_hsi_peek_on_control_complete; | |
517 | ret = hsi_async_read(hi->cl, msg); | |
518 | if (ret) | |
519 | cs_hsi_control_read_error(hi, msg); | |
520 | } | |
521 | ||
522 | static void cs_hsi_write_on_control_complete(struct hsi_msg *msg) | |
523 | { | |
524 | struct cs_hsi_iface *hi = msg->context; | |
525 | if (msg->status == HSI_STATUS_COMPLETED) { | |
526 | spin_lock(&hi->lock); | |
527 | hi->control_state &= ~SSI_CHANNEL_STATE_WRITING; | |
528 | cs_release_cmd(msg); | |
529 | spin_unlock(&hi->lock); | |
530 | } else if (msg->status == HSI_STATUS_ERROR) { | |
531 | cs_hsi_control_write_error(hi, msg); | |
532 | } else { | |
533 | dev_err(&hi->cl->device, | |
534 | "unexpected status in control write callback %d\n", | |
535 | msg->status); | |
536 | } | |
537 | } | |
538 | ||
539 | static int cs_hsi_write_on_control(struct cs_hsi_iface *hi, u32 message) | |
540 | { | |
541 | struct hsi_msg *msg; | |
542 | int ret; | |
543 | ||
544 | spin_lock(&hi->lock); | |
545 | if (hi->control_state & SSI_CHANNEL_STATE_ERROR) { | |
546 | spin_unlock(&hi->lock); | |
547 | return -EIO; | |
548 | } | |
549 | if (hi->control_state & SSI_CHANNEL_STATE_WRITING) { | |
550 | dev_err(&hi->cl->device, | |
551 | "Write still pending on control channel.\n"); | |
552 | spin_unlock(&hi->lock); | |
553 | return -EBUSY; | |
554 | } | |
555 | hi->control_state |= SSI_CHANNEL_STATE_WRITING; | |
556 | msg = cs_claim_cmd(hi); | |
557 | spin_unlock(&hi->lock); | |
558 | ||
559 | cs_set_cmd(msg, message); | |
560 | msg->sgt.nents = 1; | |
561 | msg->complete = cs_hsi_write_on_control_complete; | |
562 | dev_dbg(&hi->cl->device, | |
563 | "Sending control message %08X\n", message); | |
564 | ret = hsi_async_write(hi->cl, msg); | |
565 | if (ret) { | |
566 | dev_err(&hi->cl->device, | |
567 | "async_write failed with %d\n", ret); | |
568 | cs_hsi_control_write_error(hi, msg); | |
569 | } | |
570 | ||
571 | /* | |
572 | * Make sure control read is always pending when issuing | |
573 | * new control writes. This is needed as the controller | |
574 | * may flush our messages if e.g. the peer device reboots | |
575 | * unexpectedly (and we cannot directly resubmit a new read from | |
576 | * the message destructor; see cs_cmd_destructor()). | |
577 | */ | |
578 | if (!(hi->control_state & SSI_CHANNEL_STATE_READING)) { | |
579 | dev_err(&hi->cl->device, "Restarting control reads\n"); | |
580 | cs_hsi_read_on_control(hi); | |
581 | } | |
582 | ||
583 | return 0; | |
584 | } | |
585 | ||
586 | static void cs_hsi_read_on_data_complete(struct hsi_msg *msg) | |
587 | { | |
588 | struct cs_hsi_iface *hi = msg->context; | |
589 | u32 payload; | |
590 | ||
591 | if (unlikely(msg->status == HSI_STATUS_ERROR)) { | |
592 | cs_hsi_data_read_error(hi, msg); | |
593 | return; | |
594 | } | |
595 | ||
596 | spin_lock(&hi->lock); | |
597 | WARN_ON(!(hi->data_state & SSI_CHANNEL_STATE_READING)); | |
598 | hi->data_state &= ~SSI_CHANNEL_STATE_READING; | |
599 | payload = CS_RX_DATA_RECEIVED; | |
600 | payload |= hi->rx_slot; | |
601 | hi->rx_slot++; | |
602 | hi->rx_slot %= hi->rx_ptr_boundary; | |
603 | /* expose current rx ptr in mmap area */ | |
604 | hi->mmap_cfg->rx_ptr = hi->rx_slot; | |
605 | if (unlikely(waitqueue_active(&hi->datawait))) | |
606 | wake_up_interruptible(&hi->datawait); | |
607 | spin_unlock(&hi->lock); | |
608 | ||
609 | cs_notify_data(payload, hi->rx_bufs); | |
610 | cs_hsi_read_on_data(hi); | |
611 | } | |
612 | ||
613 | static void cs_hsi_peek_on_data_complete(struct hsi_msg *msg) | |
614 | { | |
615 | struct cs_hsi_iface *hi = msg->context; | |
616 | u32 *address; | |
617 | int ret; | |
618 | ||
619 | if (unlikely(msg->status == HSI_STATUS_ERROR)) { | |
620 | cs_hsi_data_read_error(hi, msg); | |
621 | return; | |
622 | } | |
623 | if (unlikely(hi->iface_state != CS_STATE_CONFIGURED)) { | |
624 | dev_err(&hi->cl->device, "Data received in invalid state\n"); | |
625 | cs_hsi_data_read_error(hi, msg); | |
626 | return; | |
627 | } | |
628 | ||
629 | spin_lock(&hi->lock); | |
630 | WARN_ON(!(hi->data_state & SSI_CHANNEL_STATE_POLL)); | |
631 | hi->data_state &= ~SSI_CHANNEL_STATE_POLL; | |
632 | hi->data_state |= SSI_CHANNEL_STATE_READING; | |
633 | spin_unlock(&hi->lock); | |
634 | ||
635 | address = (u32 *)(hi->mmap_base + | |
636 | hi->rx_offsets[hi->rx_slot % hi->rx_bufs]); | |
637 | sg_init_one(msg->sgt.sgl, address, hi->buf_size); | |
638 | msg->sgt.nents = 1; | |
639 | msg->complete = cs_hsi_read_on_data_complete; | |
640 | ret = hsi_async_read(hi->cl, msg); | |
641 | if (ret) | |
642 | cs_hsi_data_read_error(hi, msg); | |
643 | } | |
644 | ||
645 | /* | |
646 | * Read/write transaction is ongoing. Returns false if in | |
647 | * SSI_CHANNEL_STATE_POLL state. | |
648 | */ | |
649 | static inline int cs_state_xfer_active(unsigned int state) | |
650 | { | |
651 | return (state & SSI_CHANNEL_STATE_WRITING) || | |
652 | (state & SSI_CHANNEL_STATE_READING); | |
653 | } | |
654 | ||
655 | /* | |
656 | * No pending read/writes | |
657 | */ | |
658 | static inline int cs_state_idle(unsigned int state) | |
659 | { | |
660 | return !(state & ~SSI_CHANNEL_STATE_ERROR); | |
661 | } | |
662 | ||
663 | static void cs_hsi_read_on_data(struct cs_hsi_iface *hi) | |
664 | { | |
665 | struct hsi_msg *rxmsg; | |
666 | int ret; | |
667 | ||
668 | spin_lock(&hi->lock); | |
669 | if (hi->data_state & | |
670 | (SSI_CHANNEL_STATE_READING | SSI_CHANNEL_STATE_POLL)) { | |
671 | dev_dbg(&hi->cl->device, "Data read already pending (%u)\n", | |
672 | hi->data_state); | |
673 | spin_unlock(&hi->lock); | |
674 | return; | |
675 | } | |
676 | hi->data_state |= SSI_CHANNEL_STATE_POLL; | |
677 | spin_unlock(&hi->lock); | |
678 | ||
679 | rxmsg = hi->data_rx_msg; | |
680 | sg_init_one(rxmsg->sgt.sgl, (void *)hi->mmap_base, 0); | |
681 | rxmsg->sgt.nents = 0; | |
682 | rxmsg->complete = cs_hsi_peek_on_data_complete; | |
683 | ||
684 | ret = hsi_async_read(hi->cl, rxmsg); | |
685 | if (ret) | |
686 | cs_hsi_data_read_error(hi, rxmsg); | |
687 | } | |
688 | ||
689 | static void cs_hsi_write_on_data_complete(struct hsi_msg *msg) | |
690 | { | |
691 | struct cs_hsi_iface *hi = msg->context; | |
692 | ||
693 | if (msg->status == HSI_STATUS_COMPLETED) { | |
694 | spin_lock(&hi->lock); | |
695 | hi->data_state &= ~SSI_CHANNEL_STATE_WRITING; | |
696 | if (unlikely(waitqueue_active(&hi->datawait))) | |
697 | wake_up_interruptible(&hi->datawait); | |
698 | spin_unlock(&hi->lock); | |
699 | } else { | |
700 | cs_hsi_data_write_error(hi, msg); | |
701 | } | |
702 | } | |
703 | ||
704 | static int cs_hsi_write_on_data(struct cs_hsi_iface *hi, unsigned int slot) | |
705 | { | |
706 | u32 *address; | |
707 | struct hsi_msg *txmsg; | |
708 | int ret; | |
709 | ||
710 | spin_lock(&hi->lock); | |
711 | if (hi->iface_state != CS_STATE_CONFIGURED) { | |
712 | dev_err(&hi->cl->device, "Not configured, aborting\n"); | |
713 | ret = -EINVAL; | |
714 | goto error; | |
715 | } | |
716 | if (hi->data_state & SSI_CHANNEL_STATE_ERROR) { | |
717 | dev_err(&hi->cl->device, "HSI error, aborting\n"); | |
718 | ret = -EIO; | |
719 | goto error; | |
720 | } | |
721 | if (hi->data_state & SSI_CHANNEL_STATE_WRITING) { | |
722 | dev_err(&hi->cl->device, "Write pending on data channel.\n"); | |
723 | ret = -EBUSY; | |
724 | goto error; | |
725 | } | |
726 | hi->data_state |= SSI_CHANNEL_STATE_WRITING; | |
727 | spin_unlock(&hi->lock); | |
728 | ||
729 | hi->tx_slot = slot; | |
730 | address = (u32 *)(hi->mmap_base + hi->tx_offsets[hi->tx_slot]); | |
731 | txmsg = hi->data_tx_msg; | |
732 | sg_init_one(txmsg->sgt.sgl, address, hi->buf_size); | |
733 | txmsg->complete = cs_hsi_write_on_data_complete; | |
734 | ret = hsi_async_write(hi->cl, txmsg); | |
735 | if (ret) | |
736 | cs_hsi_data_write_error(hi, txmsg); | |
737 | ||
738 | return ret; | |
739 | ||
740 | error: | |
741 | spin_unlock(&hi->lock); | |
742 | if (ret == -EIO) | |
743 | cs_hsi_data_write_error(hi, hi->data_tx_msg); | |
744 | ||
745 | return ret; | |
746 | } | |
747 | ||
748 | static unsigned int cs_hsi_get_state(struct cs_hsi_iface *hi) | |
749 | { | |
750 | return hi->iface_state; | |
751 | } | |
752 | ||
753 | static int cs_hsi_command(struct cs_hsi_iface *hi, u32 cmd) | |
754 | { | |
755 | int ret = 0; | |
756 | ||
757 | local_bh_disable(); | |
758 | switch (cmd & TARGET_MASK) { | |
759 | case TARGET_REMOTE: | |
760 | ret = cs_hsi_write_on_control(hi, cmd); | |
761 | break; | |
762 | case TARGET_LOCAL: | |
763 | if ((cmd & CS_CMD_MASK) == CS_TX_DATA_READY) | |
764 | ret = cs_hsi_write_on_data(hi, cmd & CS_PARAM_MASK); | |
765 | else | |
766 | ret = -EINVAL; | |
767 | break; | |
768 | default: | |
769 | ret = -EINVAL; | |
770 | break; | |
771 | } | |
772 | local_bh_enable(); | |
773 | ||
774 | return ret; | |
775 | } | |
776 | ||
777 | static void cs_hsi_set_wakeline(struct cs_hsi_iface *hi, bool new_state) | |
778 | { | |
779 | int change = 0; | |
780 | ||
781 | spin_lock_bh(&hi->lock); | |
782 | if (hi->wakeline_state != new_state) { | |
783 | hi->wakeline_state = new_state; | |
784 | change = 1; | |
785 | dev_dbg(&hi->cl->device, "setting wake line to %d (%p)\n", | |
786 | new_state, hi->cl); | |
787 | } | |
788 | spin_unlock_bh(&hi->lock); | |
789 | ||
790 | if (change) { | |
791 | if (new_state) | |
792 | ssip_slave_start_tx(hi->master); | |
793 | else | |
794 | ssip_slave_stop_tx(hi->master); | |
795 | } | |
796 | ||
797 | dev_dbg(&hi->cl->device, "wake line set to %d (%p)\n", | |
798 | new_state, hi->cl); | |
799 | } | |
800 | ||
801 | static void set_buffer_sizes(struct cs_hsi_iface *hi, int rx_bufs, int tx_bufs) | |
802 | { | |
803 | hi->rx_bufs = rx_bufs; | |
804 | hi->tx_bufs = tx_bufs; | |
805 | hi->mmap_cfg->rx_bufs = rx_bufs; | |
806 | hi->mmap_cfg->tx_bufs = tx_bufs; | |
807 | ||
808 | if (hi->flags & CS_FEAT_ROLLING_RX_COUNTER) { | |
809 | /* | |
810 | * For more robust overrun detection, let the rx | |
811 | * pointer run in range 0..'boundary-1'. Boundary | |
812 | * is a multiple of rx_bufs, and limited in max size | |
813 | * by RX_PTR_MAX_SHIFT to allow for fast ptr-diff | |
814 | * calculation. | |
815 | */ | |
816 | hi->rx_ptr_boundary = (rx_bufs << RX_PTR_BOUNDARY_SHIFT); | |
817 | hi->mmap_cfg->rx_ptr_boundary = hi->rx_ptr_boundary; | |
818 | } else { | |
819 | hi->rx_ptr_boundary = hi->rx_bufs; | |
820 | } | |
821 | } | |
822 | ||
823 | static int check_buf_params(struct cs_hsi_iface *hi, | |
824 | const struct cs_buffer_config *buf_cfg) | |
825 | { | |
826 | size_t buf_size_aligned = L1_CACHE_ALIGN(buf_cfg->buf_size) * | |
827 | (buf_cfg->rx_bufs + buf_cfg->tx_bufs); | |
828 | size_t ctrl_size_aligned = L1_CACHE_ALIGN(sizeof(*hi->mmap_cfg)); | |
829 | int r = 0; | |
830 | ||
831 | if (buf_cfg->rx_bufs > CS_MAX_BUFFERS || | |
832 | buf_cfg->tx_bufs > CS_MAX_BUFFERS) { | |
833 | r = -EINVAL; | |
834 | } else if ((buf_size_aligned + ctrl_size_aligned) >= hi->mmap_size) { | |
835 | dev_err(&hi->cl->device, "No space for the requested buffer " | |
836 | "configuration\n"); | |
837 | r = -ENOBUFS; | |
838 | } | |
839 | ||
840 | return r; | |
841 | } | |
842 | ||
843 | /** | |
844 | * Block until pending data transfers have completed. | |
845 | */ | |
846 | static int cs_hsi_data_sync(struct cs_hsi_iface *hi) | |
847 | { | |
848 | int r = 0; | |
849 | ||
850 | spin_lock_bh(&hi->lock); | |
851 | ||
852 | if (!cs_state_xfer_active(hi->data_state)) { | |
853 | dev_dbg(&hi->cl->device, "hsi_data_sync break, idle\n"); | |
854 | goto out; | |
855 | } | |
856 | ||
857 | for (;;) { | |
858 | int s; | |
859 | DEFINE_WAIT(wait); | |
860 | if (!cs_state_xfer_active(hi->data_state)) | |
861 | goto out; | |
862 | if (signal_pending(current)) { | |
863 | r = -ERESTARTSYS; | |
864 | goto out; | |
865 | } | |
866 | /** | |
867 | * prepare_to_wait must be called with hi->lock held | |
868 | * so that callbacks can check for waitqueue_active() | |
869 | */ | |
870 | prepare_to_wait(&hi->datawait, &wait, TASK_INTERRUPTIBLE); | |
871 | spin_unlock_bh(&hi->lock); | |
872 | s = schedule_timeout( | |
873 | msecs_to_jiffies(CS_HSI_TRANSFER_TIMEOUT_MS)); | |
874 | spin_lock_bh(&hi->lock); | |
875 | finish_wait(&hi->datawait, &wait); | |
876 | if (!s) { | |
877 | dev_dbg(&hi->cl->device, | |
878 | "hsi_data_sync timeout after %d ms\n", | |
879 | CS_HSI_TRANSFER_TIMEOUT_MS); | |
880 | r = -EIO; | |
881 | goto out; | |
882 | } | |
883 | } | |
884 | ||
885 | out: | |
886 | spin_unlock_bh(&hi->lock); | |
887 | dev_dbg(&hi->cl->device, "hsi_data_sync done with res %d\n", r); | |
888 | ||
889 | return r; | |
890 | } | |
891 | ||
892 | static void cs_hsi_data_enable(struct cs_hsi_iface *hi, | |
893 | struct cs_buffer_config *buf_cfg) | |
894 | { | |
895 | unsigned int data_start, i; | |
896 | ||
897 | BUG_ON(hi->buf_size == 0); | |
898 | ||
899 | set_buffer_sizes(hi, buf_cfg->rx_bufs, buf_cfg->tx_bufs); | |
900 | ||
901 | hi->slot_size = L1_CACHE_ALIGN(hi->buf_size); | |
902 | dev_dbg(&hi->cl->device, | |
903 | "setting slot size to %u, buf size %u, align %u\n", | |
904 | hi->slot_size, hi->buf_size, L1_CACHE_BYTES); | |
905 | ||
906 | data_start = L1_CACHE_ALIGN(sizeof(*hi->mmap_cfg)); | |
907 | dev_dbg(&hi->cl->device, | |
908 | "setting data start at %u, cfg block %u, align %u\n", | |
909 | data_start, sizeof(*hi->mmap_cfg), L1_CACHE_BYTES); | |
910 | ||
911 | for (i = 0; i < hi->mmap_cfg->rx_bufs; i++) { | |
912 | hi->rx_offsets[i] = data_start + i * hi->slot_size; | |
913 | hi->mmap_cfg->rx_offsets[i] = hi->rx_offsets[i]; | |
914 | dev_dbg(&hi->cl->device, "DL buf #%u at %u\n", | |
915 | i, hi->rx_offsets[i]); | |
916 | } | |
917 | for (i = 0; i < hi->mmap_cfg->tx_bufs; i++) { | |
918 | hi->tx_offsets[i] = data_start + | |
919 | (i + hi->mmap_cfg->rx_bufs) * hi->slot_size; | |
920 | hi->mmap_cfg->tx_offsets[i] = hi->tx_offsets[i]; | |
921 | dev_dbg(&hi->cl->device, "UL buf #%u at %u\n", | |
922 | i, hi->rx_offsets[i]); | |
923 | } | |
924 | ||
925 | hi->iface_state = CS_STATE_CONFIGURED; | |
926 | } | |
927 | ||
928 | static void cs_hsi_data_disable(struct cs_hsi_iface *hi, int old_state) | |
929 | { | |
930 | if (old_state == CS_STATE_CONFIGURED) { | |
931 | dev_dbg(&hi->cl->device, | |
932 | "closing data channel with slot size 0\n"); | |
933 | hi->iface_state = CS_STATE_OPENED; | |
934 | } | |
935 | } | |
936 | ||
937 | static int cs_hsi_buf_config(struct cs_hsi_iface *hi, | |
938 | struct cs_buffer_config *buf_cfg) | |
939 | { | |
940 | int r = 0; | |
941 | unsigned int old_state = hi->iface_state; | |
942 | ||
943 | spin_lock_bh(&hi->lock); | |
944 | /* Prevent new transactions during buffer reconfig */ | |
945 | if (old_state == CS_STATE_CONFIGURED) | |
946 | hi->iface_state = CS_STATE_OPENED; | |
947 | spin_unlock_bh(&hi->lock); | |
948 | ||
949 | /* | |
950 | * make sure that no non-zero data reads are ongoing before | |
951 | * proceeding to change the buffer layout | |
952 | */ | |
953 | r = cs_hsi_data_sync(hi); | |
954 | if (r < 0) | |
955 | return r; | |
956 | ||
957 | WARN_ON(cs_state_xfer_active(hi->data_state)); | |
958 | ||
959 | spin_lock_bh(&hi->lock); | |
960 | r = check_buf_params(hi, buf_cfg); | |
961 | if (r < 0) | |
962 | goto error; | |
963 | ||
964 | hi->buf_size = buf_cfg->buf_size; | |
965 | hi->mmap_cfg->buf_size = hi->buf_size; | |
966 | hi->flags = buf_cfg->flags; | |
967 | ||
968 | hi->rx_slot = 0; | |
969 | hi->tx_slot = 0; | |
970 | hi->slot_size = 0; | |
971 | ||
972 | if (hi->buf_size) | |
973 | cs_hsi_data_enable(hi, buf_cfg); | |
974 | else | |
975 | cs_hsi_data_disable(hi, old_state); | |
976 | ||
977 | spin_unlock_bh(&hi->lock); | |
978 | ||
979 | if (old_state != hi->iface_state) { | |
980 | if (hi->iface_state == CS_STATE_CONFIGURED) { | |
981 | pm_qos_add_request(&hi->pm_qos_req, | |
982 | PM_QOS_CPU_DMA_LATENCY, | |
983 | CS_QOS_LATENCY_FOR_DATA_USEC); | |
984 | local_bh_disable(); | |
985 | cs_hsi_read_on_data(hi); | |
986 | local_bh_enable(); | |
987 | } else if (old_state == CS_STATE_CONFIGURED) { | |
988 | pm_qos_remove_request(&hi->pm_qos_req); | |
989 | } | |
990 | } | |
991 | return r; | |
992 | ||
993 | error: | |
994 | spin_unlock_bh(&hi->lock); | |
995 | return r; | |
996 | } | |
997 | ||
998 | static int cs_hsi_start(struct cs_hsi_iface **hi, struct hsi_client *cl, | |
999 | unsigned long mmap_base, unsigned long mmap_size) | |
1000 | { | |
1001 | int err = 0; | |
1002 | struct cs_hsi_iface *hsi_if = kzalloc(sizeof(*hsi_if), GFP_KERNEL); | |
1003 | ||
1004 | dev_dbg(&cl->device, "cs_hsi_start\n"); | |
1005 | ||
1006 | if (!hsi_if) { | |
1007 | err = -ENOMEM; | |
1008 | goto leave0; | |
1009 | } | |
1010 | spin_lock_init(&hsi_if->lock); | |
1011 | hsi_if->cl = cl; | |
1012 | hsi_if->iface_state = CS_STATE_CLOSED; | |
1013 | hsi_if->mmap_cfg = (struct cs_mmap_config_block *)mmap_base; | |
1014 | hsi_if->mmap_base = mmap_base; | |
1015 | hsi_if->mmap_size = mmap_size; | |
1016 | memset(hsi_if->mmap_cfg, 0, sizeof(*hsi_if->mmap_cfg)); | |
1017 | init_waitqueue_head(&hsi_if->datawait); | |
1018 | err = cs_alloc_cmds(hsi_if); | |
1019 | if (err < 0) { | |
1020 | dev_err(&cl->device, "Unable to alloc HSI messages\n"); | |
1021 | goto leave1; | |
1022 | } | |
1023 | err = cs_hsi_alloc_data(hsi_if); | |
1024 | if (err < 0) { | |
1025 | dev_err(&cl->device, "Unable to alloc HSI messages for data\n"); | |
1026 | goto leave2; | |
1027 | } | |
1028 | err = hsi_claim_port(cl, 1); | |
1029 | if (err < 0) { | |
1030 | dev_err(&cl->device, | |
1031 | "Could not open, HSI port already claimed\n"); | |
1032 | goto leave3; | |
1033 | } | |
1034 | hsi_if->master = ssip_slave_get_master(cl); | |
1035 | if (IS_ERR(hsi_if->master)) { | |
265ef3ee | 1036 | err = PTR_ERR(hsi_if->master); |
7f62fe8a KV |
1037 | dev_err(&cl->device, "Could not get HSI master client\n"); |
1038 | goto leave4; | |
1039 | } | |
1040 | if (!ssip_slave_running(hsi_if->master)) { | |
1041 | err = -ENODEV; | |
1042 | dev_err(&cl->device, | |
1043 | "HSI port not initialized\n"); | |
1044 | goto leave4; | |
1045 | } | |
1046 | ||
1047 | hsi_if->iface_state = CS_STATE_OPENED; | |
1048 | local_bh_disable(); | |
1049 | cs_hsi_read_on_control(hsi_if); | |
1050 | local_bh_enable(); | |
1051 | ||
1052 | dev_dbg(&cl->device, "cs_hsi_start...done\n"); | |
1053 | ||
1054 | BUG_ON(!hi); | |
1055 | *hi = hsi_if; | |
1056 | ||
1057 | return 0; | |
1058 | ||
1059 | leave4: | |
1060 | hsi_release_port(cl); | |
1061 | leave3: | |
1062 | cs_hsi_free_data(hsi_if); | |
1063 | leave2: | |
1064 | cs_free_cmds(hsi_if); | |
1065 | leave1: | |
1066 | kfree(hsi_if); | |
1067 | leave0: | |
1068 | dev_dbg(&cl->device, "cs_hsi_start...done/error\n\n"); | |
1069 | ||
1070 | return err; | |
1071 | } | |
1072 | ||
1073 | static void cs_hsi_stop(struct cs_hsi_iface *hi) | |
1074 | { | |
1075 | dev_dbg(&hi->cl->device, "cs_hsi_stop\n"); | |
1076 | cs_hsi_set_wakeline(hi, 0); | |
1077 | ssip_slave_put_master(hi->master); | |
1078 | ||
1079 | /* hsi_release_port() needs to be called with CS_STATE_CLOSED */ | |
1080 | hi->iface_state = CS_STATE_CLOSED; | |
1081 | hsi_release_port(hi->cl); | |
1082 | ||
1083 | /* | |
1084 | * hsi_release_port() should flush out all the pending | |
1085 | * messages, so cs_state_idle() should be true for both | |
1086 | * control and data channels. | |
1087 | */ | |
1088 | WARN_ON(!cs_state_idle(hi->control_state)); | |
1089 | WARN_ON(!cs_state_idle(hi->data_state)); | |
1090 | ||
1091 | if (pm_qos_request_active(&hi->pm_qos_req)) | |
1092 | pm_qos_remove_request(&hi->pm_qos_req); | |
1093 | ||
1094 | spin_lock_bh(&hi->lock); | |
1095 | cs_hsi_free_data(hi); | |
1096 | cs_free_cmds(hi); | |
1097 | spin_unlock_bh(&hi->lock); | |
1098 | kfree(hi); | |
1099 | } | |
1100 | ||
1101 | static int cs_char_vma_fault(struct vm_area_struct *vma, struct vm_fault *vmf) | |
1102 | { | |
1103 | struct cs_char *csdata = vma->vm_private_data; | |
1104 | struct page *page; | |
1105 | ||
1106 | page = virt_to_page(csdata->mmap_base); | |
1107 | get_page(page); | |
1108 | vmf->page = page; | |
1109 | ||
1110 | return 0; | |
1111 | } | |
1112 | ||
7cbea8dc | 1113 | static const struct vm_operations_struct cs_char_vm_ops = { |
7f62fe8a KV |
1114 | .fault = cs_char_vma_fault, |
1115 | }; | |
1116 | ||
1117 | static int cs_char_fasync(int fd, struct file *file, int on) | |
1118 | { | |
1119 | struct cs_char *csdata = file->private_data; | |
1120 | ||
1121 | if (fasync_helper(fd, file, on, &csdata->async_queue) < 0) | |
1122 | return -EIO; | |
1123 | ||
1124 | return 0; | |
1125 | } | |
1126 | ||
1127 | static unsigned int cs_char_poll(struct file *file, poll_table *wait) | |
1128 | { | |
1129 | struct cs_char *csdata = file->private_data; | |
1130 | unsigned int ret = 0; | |
1131 | ||
1132 | poll_wait(file, &cs_char_data.wait, wait); | |
1133 | spin_lock_bh(&csdata->lock); | |
1134 | if (!list_empty(&csdata->chardev_queue)) | |
1135 | ret = POLLIN | POLLRDNORM; | |
1136 | else if (!list_empty(&csdata->dataind_queue)) | |
1137 | ret = POLLIN | POLLRDNORM; | |
1138 | spin_unlock_bh(&csdata->lock); | |
1139 | ||
1140 | return ret; | |
1141 | } | |
1142 | ||
1143 | static ssize_t cs_char_read(struct file *file, char __user *buf, size_t count, | |
1144 | loff_t *unused) | |
1145 | { | |
1146 | struct cs_char *csdata = file->private_data; | |
1147 | u32 data; | |
1148 | ssize_t retval; | |
1149 | ||
1150 | if (count < sizeof(data)) | |
1151 | return -EINVAL; | |
1152 | ||
1153 | for (;;) { | |
1154 | DEFINE_WAIT(wait); | |
1155 | ||
1156 | spin_lock_bh(&csdata->lock); | |
1157 | if (!list_empty(&csdata->chardev_queue)) { | |
1158 | data = cs_pop_entry(&csdata->chardev_queue); | |
1159 | } else if (!list_empty(&csdata->dataind_queue)) { | |
1160 | data = cs_pop_entry(&csdata->dataind_queue); | |
1161 | csdata->dataind_pending--; | |
1162 | } else { | |
1163 | data = 0; | |
1164 | } | |
1165 | spin_unlock_bh(&csdata->lock); | |
1166 | ||
1167 | if (data) | |
1168 | break; | |
1169 | if (file->f_flags & O_NONBLOCK) { | |
1170 | retval = -EAGAIN; | |
1171 | goto out; | |
1172 | } else if (signal_pending(current)) { | |
1173 | retval = -ERESTARTSYS; | |
1174 | goto out; | |
1175 | } | |
1176 | prepare_to_wait_exclusive(&csdata->wait, &wait, | |
1177 | TASK_INTERRUPTIBLE); | |
1178 | schedule(); | |
1179 | finish_wait(&csdata->wait, &wait); | |
1180 | } | |
1181 | ||
1182 | retval = put_user(data, (u32 __user *)buf); | |
1183 | if (!retval) | |
1184 | retval = sizeof(data); | |
1185 | ||
1186 | out: | |
1187 | return retval; | |
1188 | } | |
1189 | ||
1190 | static ssize_t cs_char_write(struct file *file, const char __user *buf, | |
1191 | size_t count, loff_t *unused) | |
1192 | { | |
1193 | struct cs_char *csdata = file->private_data; | |
1194 | u32 data; | |
1195 | int err; | |
1196 | ssize_t retval; | |
1197 | ||
1198 | if (count < sizeof(data)) | |
1199 | return -EINVAL; | |
1200 | ||
1201 | if (get_user(data, (u32 __user *)buf)) | |
1202 | retval = -EFAULT; | |
1203 | else | |
1204 | retval = count; | |
1205 | ||
1206 | err = cs_hsi_command(csdata->hi, data); | |
1207 | if (err < 0) | |
1208 | retval = err; | |
1209 | ||
1210 | return retval; | |
1211 | } | |
1212 | ||
1213 | static long cs_char_ioctl(struct file *file, unsigned int cmd, | |
1214 | unsigned long arg) | |
1215 | { | |
1216 | struct cs_char *csdata = file->private_data; | |
1217 | int r = 0; | |
1218 | ||
1219 | switch (cmd) { | |
1220 | case CS_GET_STATE: { | |
1221 | unsigned int state; | |
1222 | ||
1223 | state = cs_hsi_get_state(csdata->hi); | |
1224 | if (copy_to_user((void __user *)arg, &state, sizeof(state))) | |
1225 | r = -EFAULT; | |
1226 | ||
1227 | break; | |
1228 | } | |
1229 | case CS_SET_WAKELINE: { | |
1230 | unsigned int state; | |
1231 | ||
1232 | if (copy_from_user(&state, (void __user *)arg, sizeof(state))) { | |
1233 | r = -EFAULT; | |
1234 | break; | |
1235 | } | |
1236 | ||
1237 | if (state > 1) { | |
1238 | r = -EINVAL; | |
1239 | break; | |
1240 | } | |
1241 | ||
1242 | cs_hsi_set_wakeline(csdata->hi, !!state); | |
1243 | ||
1244 | break; | |
1245 | } | |
1246 | case CS_GET_IF_VERSION: { | |
1247 | unsigned int ifver = CS_IF_VERSION; | |
1248 | ||
1249 | if (copy_to_user((void __user *)arg, &ifver, sizeof(ifver))) | |
1250 | r = -EFAULT; | |
1251 | ||
1252 | break; | |
1253 | } | |
1254 | case CS_CONFIG_BUFS: { | |
1255 | struct cs_buffer_config buf_cfg; | |
1256 | ||
1257 | if (copy_from_user(&buf_cfg, (void __user *)arg, | |
1258 | sizeof(buf_cfg))) | |
1259 | r = -EFAULT; | |
1260 | else | |
1261 | r = cs_hsi_buf_config(csdata->hi, &buf_cfg); | |
1262 | ||
1263 | break; | |
1264 | } | |
1265 | default: | |
1266 | r = -ENOTTY; | |
1267 | break; | |
1268 | } | |
1269 | ||
1270 | return r; | |
1271 | } | |
1272 | ||
1273 | static int cs_char_mmap(struct file *file, struct vm_area_struct *vma) | |
1274 | { | |
1275 | if (vma->vm_end < vma->vm_start) | |
1276 | return -EINVAL; | |
1277 | ||
1278 | if (((vma->vm_end - vma->vm_start) >> PAGE_SHIFT) != 1) | |
1279 | return -EINVAL; | |
1280 | ||
1281 | vma->vm_flags |= VM_IO | VM_DONTDUMP | VM_DONTEXPAND; | |
1282 | vma->vm_ops = &cs_char_vm_ops; | |
1283 | vma->vm_private_data = file->private_data; | |
1284 | ||
1285 | return 0; | |
1286 | } | |
1287 | ||
1288 | static int cs_char_open(struct inode *unused, struct file *file) | |
1289 | { | |
1290 | int ret = 0; | |
1291 | unsigned long p; | |
1292 | ||
1293 | spin_lock_bh(&cs_char_data.lock); | |
1294 | if (cs_char_data.opened) { | |
1295 | ret = -EBUSY; | |
1296 | spin_unlock_bh(&cs_char_data.lock); | |
1297 | goto out1; | |
1298 | } | |
1299 | cs_char_data.opened = 1; | |
1300 | cs_char_data.dataind_pending = 0; | |
1301 | spin_unlock_bh(&cs_char_data.lock); | |
1302 | ||
1303 | p = get_zeroed_page(GFP_KERNEL); | |
1304 | if (!p) { | |
1305 | ret = -ENOMEM; | |
1306 | goto out2; | |
1307 | } | |
1308 | ||
1309 | ret = cs_hsi_start(&cs_char_data.hi, cs_char_data.cl, p, CS_MMAP_SIZE); | |
1310 | if (ret) { | |
1311 | dev_err(&cs_char_data.cl->device, "Unable to initialize HSI\n"); | |
1312 | goto out3; | |
1313 | } | |
1314 | ||
1315 | /* these are only used in release so lock not needed */ | |
1316 | cs_char_data.mmap_base = p; | |
1317 | cs_char_data.mmap_size = CS_MMAP_SIZE; | |
1318 | ||
1319 | file->private_data = &cs_char_data; | |
1320 | ||
1321 | return 0; | |
1322 | ||
1323 | out3: | |
1324 | free_page(p); | |
1325 | out2: | |
1326 | spin_lock_bh(&cs_char_data.lock); | |
1327 | cs_char_data.opened = 0; | |
1328 | spin_unlock_bh(&cs_char_data.lock); | |
1329 | out1: | |
1330 | return ret; | |
1331 | } | |
1332 | ||
1333 | static void cs_free_char_queue(struct list_head *head) | |
1334 | { | |
1335 | struct char_queue *entry; | |
1336 | struct list_head *cursor, *next; | |
1337 | ||
1338 | if (!list_empty(head)) { | |
1339 | list_for_each_safe(cursor, next, head) { | |
1340 | entry = list_entry(cursor, struct char_queue, list); | |
1341 | list_del(&entry->list); | |
1342 | kfree(entry); | |
1343 | } | |
1344 | } | |
1345 | ||
1346 | } | |
1347 | ||
1348 | static int cs_char_release(struct inode *unused, struct file *file) | |
1349 | { | |
1350 | struct cs_char *csdata = file->private_data; | |
1351 | ||
1352 | cs_hsi_stop(csdata->hi); | |
1353 | spin_lock_bh(&csdata->lock); | |
1354 | csdata->hi = NULL; | |
1355 | free_page(csdata->mmap_base); | |
1356 | cs_free_char_queue(&csdata->chardev_queue); | |
1357 | cs_free_char_queue(&csdata->dataind_queue); | |
1358 | csdata->opened = 0; | |
1359 | spin_unlock_bh(&csdata->lock); | |
1360 | ||
1361 | return 0; | |
1362 | } | |
1363 | ||
1364 | static const struct file_operations cs_char_fops = { | |
1365 | .owner = THIS_MODULE, | |
1366 | .read = cs_char_read, | |
1367 | .write = cs_char_write, | |
1368 | .poll = cs_char_poll, | |
1369 | .unlocked_ioctl = cs_char_ioctl, | |
1370 | .mmap = cs_char_mmap, | |
1371 | .open = cs_char_open, | |
1372 | .release = cs_char_release, | |
1373 | .fasync = cs_char_fasync, | |
1374 | }; | |
1375 | ||
1376 | static struct miscdevice cs_char_miscdev = { | |
1377 | .minor = MISC_DYNAMIC_MINOR, | |
1378 | .name = "cmt_speech", | |
1379 | .fops = &cs_char_fops | |
1380 | }; | |
1381 | ||
1382 | static int cs_hsi_client_probe(struct device *dev) | |
1383 | { | |
1384 | int err = 0; | |
1385 | struct hsi_client *cl = to_hsi_client(dev); | |
1386 | ||
1387 | dev_dbg(dev, "hsi_client_probe\n"); | |
1388 | init_waitqueue_head(&cs_char_data.wait); | |
1389 | spin_lock_init(&cs_char_data.lock); | |
1390 | cs_char_data.opened = 0; | |
1391 | cs_char_data.cl = cl; | |
1392 | cs_char_data.hi = NULL; | |
1393 | INIT_LIST_HEAD(&cs_char_data.chardev_queue); | |
1394 | INIT_LIST_HEAD(&cs_char_data.dataind_queue); | |
1395 | ||
1396 | cs_char_data.channel_id_cmd = hsi_get_channel_id_by_name(cl, | |
1397 | "speech-control"); | |
1398 | if (cs_char_data.channel_id_cmd < 0) { | |
1399 | err = cs_char_data.channel_id_cmd; | |
1400 | dev_err(dev, "Could not get cmd channel (%d)\n", err); | |
1401 | return err; | |
1402 | } | |
1403 | ||
1404 | cs_char_data.channel_id_data = hsi_get_channel_id_by_name(cl, | |
1405 | "speech-data"); | |
1406 | if (cs_char_data.channel_id_data < 0) { | |
1407 | err = cs_char_data.channel_id_data; | |
1408 | dev_err(dev, "Could not get data channel (%d)\n", err); | |
1409 | return err; | |
1410 | } | |
1411 | ||
1412 | err = misc_register(&cs_char_miscdev); | |
1413 | if (err) | |
1414 | dev_err(dev, "Failed to register: %d\n", err); | |
1415 | ||
1416 | return err; | |
1417 | } | |
1418 | ||
1419 | static int cs_hsi_client_remove(struct device *dev) | |
1420 | { | |
1421 | struct cs_hsi_iface *hi; | |
1422 | ||
1423 | dev_dbg(dev, "hsi_client_remove\n"); | |
1424 | misc_deregister(&cs_char_miscdev); | |
1425 | spin_lock_bh(&cs_char_data.lock); | |
1426 | hi = cs_char_data.hi; | |
1427 | cs_char_data.hi = NULL; | |
1428 | spin_unlock_bh(&cs_char_data.lock); | |
1429 | if (hi) | |
1430 | cs_hsi_stop(hi); | |
1431 | ||
1432 | return 0; | |
1433 | } | |
1434 | ||
1435 | static struct hsi_client_driver cs_hsi_driver = { | |
1436 | .driver = { | |
1437 | .name = "cmt-speech", | |
1438 | .owner = THIS_MODULE, | |
1439 | .probe = cs_hsi_client_probe, | |
1440 | .remove = cs_hsi_client_remove, | |
1441 | }, | |
1442 | }; | |
1443 | ||
1444 | static int __init cs_char_init(void) | |
1445 | { | |
1446 | pr_info("CMT speech driver added\n"); | |
1447 | return hsi_register_client_driver(&cs_hsi_driver); | |
1448 | } | |
1449 | module_init(cs_char_init); | |
1450 | ||
1451 | static void __exit cs_char_exit(void) | |
1452 | { | |
1453 | hsi_unregister_client_driver(&cs_hsi_driver); | |
1454 | pr_info("CMT speech driver removed\n"); | |
1455 | } | |
1456 | module_exit(cs_char_exit); | |
1457 | ||
1458 | MODULE_ALIAS("hsi:cmt-speech"); | |
1459 | MODULE_AUTHOR("Kai Vehmanen <kai.vehmanen@nokia.com>"); | |
1460 | MODULE_AUTHOR("Peter Ujfalusi <peter.ujfalusi@nokia.com>"); | |
1461 | MODULE_DESCRIPTION("CMT speech driver"); | |
1462 | MODULE_LICENSE("GPL v2"); |