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1 | /* |
2 | * Copyright (c) 2015, Sony Mobile Communications AB. | |
3 | * Copyright (c) 2012-2013, The Linux Foundation. All rights reserved. | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License version 2 and | |
7 | * only version 2 as published by the Free Software Foundation. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, | |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
13 | */ | |
14 | ||
15 | #include <linux/interrupt.h> | |
16 | #include <linux/io.h> | |
17 | #include <linux/mfd/syscon.h> | |
18 | #include <linux/module.h> | |
19 | #include <linux/of_irq.h> | |
20 | #include <linux/of_platform.h> | |
21 | #include <linux/platform_device.h> | |
22 | #include <linux/regmap.h> | |
23 | #include <linux/sched.h> | |
24 | #include <linux/slab.h> | |
25 | #include <linux/soc/qcom/smd.h> | |
26 | #include <linux/soc/qcom/smem.h> | |
27 | #include <linux/wait.h> | |
28 | ||
29 | /* | |
30 | * The Qualcomm Shared Memory communication solution provides point-to-point | |
31 | * channels for clients to send and receive streaming or packet based data. | |
32 | * | |
33 | * Each channel consists of a control item (channel info) and a ring buffer | |
34 | * pair. The channel info carry information related to channel state, flow | |
35 | * control and the offsets within the ring buffer. | |
36 | * | |
37 | * All allocated channels are listed in an allocation table, identifying the | |
38 | * pair of items by name, type and remote processor. | |
39 | * | |
40 | * Upon creating a new channel the remote processor allocates channel info and | |
41 | * ring buffer items from the smem heap and populate the allocation table. An | |
42 | * interrupt is sent to the other end of the channel and a scan for new | |
43 | * channels should be done. A channel never goes away, it will only change | |
44 | * state. | |
45 | * | |
46 | * The remote processor signals it intent for bring up the communication | |
47 | * channel by setting the state of its end of the channel to "opening" and | |
48 | * sends out an interrupt. We detect this change and register a smd device to | |
49 | * consume the channel. Upon finding a consumer we finish the handshake and the | |
50 | * channel is up. | |
51 | * | |
52 | * Upon closing a channel, the remote processor will update the state of its | |
53 | * end of the channel and signal us, we will then unregister any attached | |
54 | * device and close our end of the channel. | |
55 | * | |
56 | * Devices attached to a channel can use the qcom_smd_send function to push | |
57 | * data to the channel, this is done by copying the data into the tx ring | |
58 | * buffer, updating the pointers in the channel info and signaling the remote | |
59 | * processor. | |
60 | * | |
61 | * The remote processor does the equivalent when it transfer data and upon | |
62 | * receiving the interrupt we check the channel info for new data and delivers | |
63 | * this to the attached device. If the device is not ready to receive the data | |
64 | * we leave it in the ring buffer for now. | |
65 | */ | |
66 | ||
67 | struct smd_channel_info; | |
68 | struct smd_channel_info_word; | |
69 | ||
70 | #define SMD_ALLOC_TBL_COUNT 2 | |
71 | #define SMD_ALLOC_TBL_SIZE 64 | |
72 | ||
73 | /* | |
74 | * This lists the various smem heap items relevant for the allocation table and | |
75 | * smd channel entries. | |
76 | */ | |
77 | static const struct { | |
78 | unsigned alloc_tbl_id; | |
79 | unsigned info_base_id; | |
80 | unsigned fifo_base_id; | |
81 | } smem_items[SMD_ALLOC_TBL_COUNT] = { | |
82 | { | |
83 | .alloc_tbl_id = 13, | |
84 | .info_base_id = 14, | |
85 | .fifo_base_id = 338 | |
86 | }, | |
87 | { | |
88 | .alloc_tbl_id = 14, | |
89 | .info_base_id = 266, | |
90 | .fifo_base_id = 202, | |
91 | }, | |
92 | }; | |
93 | ||
94 | /** | |
95 | * struct qcom_smd_edge - representing a remote processor | |
96 | * @smd: handle to qcom_smd | |
97 | * @of_node: of_node handle for information related to this edge | |
98 | * @edge_id: identifier of this edge | |
93dbed91 | 99 | * @remote_pid: identifier of remote processor |
f2ab3298 BA |
100 | * @irq: interrupt for signals on this edge |
101 | * @ipc_regmap: regmap handle holding the outgoing ipc register | |
102 | * @ipc_offset: offset within @ipc_regmap of the register for ipc | |
103 | * @ipc_bit: bit in the register at @ipc_offset of @ipc_regmap | |
104 | * @channels: list of all channels detected on this edge | |
105 | * @channels_lock: guard for modifications of @channels | |
106 | * @allocated: array of bitmaps representing already allocated channels | |
107 | * @need_rescan: flag that the @work needs to scan smem for new channels | |
108 | * @smem_available: last available amount of smem triggering a channel scan | |
109 | * @work: work item for edge house keeping | |
110 | */ | |
111 | struct qcom_smd_edge { | |
112 | struct qcom_smd *smd; | |
113 | struct device_node *of_node; | |
114 | unsigned edge_id; | |
93dbed91 | 115 | unsigned remote_pid; |
f2ab3298 BA |
116 | |
117 | int irq; | |
118 | ||
119 | struct regmap *ipc_regmap; | |
120 | int ipc_offset; | |
121 | int ipc_bit; | |
122 | ||
123 | struct list_head channels; | |
124 | spinlock_t channels_lock; | |
125 | ||
126 | DECLARE_BITMAP(allocated[SMD_ALLOC_TBL_COUNT], SMD_ALLOC_TBL_SIZE); | |
127 | ||
128 | bool need_rescan; | |
129 | unsigned smem_available; | |
130 | ||
131 | struct work_struct work; | |
132 | }; | |
133 | ||
134 | /* | |
135 | * SMD channel states. | |
136 | */ | |
137 | enum smd_channel_state { | |
138 | SMD_CHANNEL_CLOSED, | |
139 | SMD_CHANNEL_OPENING, | |
140 | SMD_CHANNEL_OPENED, | |
141 | SMD_CHANNEL_FLUSHING, | |
142 | SMD_CHANNEL_CLOSING, | |
143 | SMD_CHANNEL_RESET, | |
144 | SMD_CHANNEL_RESET_OPENING | |
145 | }; | |
146 | ||
147 | /** | |
148 | * struct qcom_smd_channel - smd channel struct | |
149 | * @edge: qcom_smd_edge this channel is living on | |
150 | * @qsdev: reference to a associated smd client device | |
151 | * @name: name of the channel | |
152 | * @state: local state of the channel | |
153 | * @remote_state: remote state of the channel | |
154 | * @tx_info: byte aligned outgoing channel info | |
155 | * @rx_info: byte aligned incoming channel info | |
156 | * @tx_info_word: word aligned outgoing channel info | |
157 | * @rx_info_word: word aligned incoming channel info | |
158 | * @tx_lock: lock to make writes to the channel mutually exclusive | |
159 | * @fblockread_event: wakeup event tied to tx fBLOCKREADINTR | |
160 | * @tx_fifo: pointer to the outgoing ring buffer | |
161 | * @rx_fifo: pointer to the incoming ring buffer | |
162 | * @fifo_size: size of each ring buffer | |
163 | * @bounce_buffer: bounce buffer for reading wrapped packets | |
164 | * @cb: callback function registered for this channel | |
165 | * @recv_lock: guard for rx info modifications and cb pointer | |
166 | * @pkt_size: size of the currently handled packet | |
167 | * @list: lite entry for @channels in qcom_smd_edge | |
168 | */ | |
169 | struct qcom_smd_channel { | |
170 | struct qcom_smd_edge *edge; | |
171 | ||
172 | struct qcom_smd_device *qsdev; | |
173 | ||
174 | char *name; | |
175 | enum smd_channel_state state; | |
176 | enum smd_channel_state remote_state; | |
177 | ||
178 | struct smd_channel_info *tx_info; | |
179 | struct smd_channel_info *rx_info; | |
180 | ||
181 | struct smd_channel_info_word *tx_info_word; | |
182 | struct smd_channel_info_word *rx_info_word; | |
183 | ||
184 | struct mutex tx_lock; | |
185 | wait_queue_head_t fblockread_event; | |
186 | ||
187 | void *tx_fifo; | |
188 | void *rx_fifo; | |
189 | int fifo_size; | |
190 | ||
191 | void *bounce_buffer; | |
192 | int (*cb)(struct qcom_smd_device *, const void *, size_t); | |
193 | ||
194 | spinlock_t recv_lock; | |
195 | ||
196 | int pkt_size; | |
197 | ||
198 | struct list_head list; | |
199 | }; | |
200 | ||
201 | /** | |
202 | * struct qcom_smd - smd struct | |
203 | * @dev: device struct | |
204 | * @num_edges: number of entries in @edges | |
205 | * @edges: array of edges to be handled | |
206 | */ | |
207 | struct qcom_smd { | |
208 | struct device *dev; | |
209 | ||
210 | unsigned num_edges; | |
211 | struct qcom_smd_edge edges[0]; | |
212 | }; | |
213 | ||
214 | /* | |
215 | * Format of the smd_info smem items, for byte aligned channels. | |
216 | */ | |
217 | struct smd_channel_info { | |
218 | u32 state; | |
219 | u8 fDSR; | |
220 | u8 fCTS; | |
221 | u8 fCD; | |
222 | u8 fRI; | |
223 | u8 fHEAD; | |
224 | u8 fTAIL; | |
225 | u8 fSTATE; | |
226 | u8 fBLOCKREADINTR; | |
227 | u32 tail; | |
228 | u32 head; | |
229 | }; | |
230 | ||
231 | /* | |
232 | * Format of the smd_info smem items, for word aligned channels. | |
233 | */ | |
234 | struct smd_channel_info_word { | |
235 | u32 state; | |
236 | u32 fDSR; | |
237 | u32 fCTS; | |
238 | u32 fCD; | |
239 | u32 fRI; | |
240 | u32 fHEAD; | |
241 | u32 fTAIL; | |
242 | u32 fSTATE; | |
243 | u32 fBLOCKREADINTR; | |
244 | u32 tail; | |
245 | u32 head; | |
246 | }; | |
247 | ||
248 | #define GET_RX_CHANNEL_INFO(channel, param) \ | |
249 | (channel->rx_info_word ? \ | |
250 | channel->rx_info_word->param : \ | |
251 | channel->rx_info->param) | |
252 | ||
253 | #define SET_RX_CHANNEL_INFO(channel, param, value) \ | |
254 | (channel->rx_info_word ? \ | |
255 | (channel->rx_info_word->param = value) : \ | |
256 | (channel->rx_info->param = value)) | |
257 | ||
258 | #define GET_TX_CHANNEL_INFO(channel, param) \ | |
259 | (channel->tx_info_word ? \ | |
260 | channel->tx_info_word->param : \ | |
261 | channel->tx_info->param) | |
262 | ||
263 | #define SET_TX_CHANNEL_INFO(channel, param, value) \ | |
264 | (channel->tx_info_word ? \ | |
265 | (channel->tx_info_word->param = value) : \ | |
266 | (channel->tx_info->param = value)) | |
267 | ||
268 | /** | |
269 | * struct qcom_smd_alloc_entry - channel allocation entry | |
270 | * @name: channel name | |
271 | * @cid: channel index | |
272 | * @flags: channel flags and edge id | |
273 | * @ref_count: reference count of the channel | |
274 | */ | |
275 | struct qcom_smd_alloc_entry { | |
276 | u8 name[20]; | |
277 | u32 cid; | |
278 | u32 flags; | |
279 | u32 ref_count; | |
280 | } __packed; | |
281 | ||
282 | #define SMD_CHANNEL_FLAGS_EDGE_MASK 0xff | |
283 | #define SMD_CHANNEL_FLAGS_STREAM BIT(8) | |
284 | #define SMD_CHANNEL_FLAGS_PACKET BIT(9) | |
285 | ||
286 | /* | |
287 | * Each smd packet contains a 20 byte header, with the first 4 being the length | |
288 | * of the packet. | |
289 | */ | |
290 | #define SMD_PACKET_HEADER_LEN 20 | |
291 | ||
292 | /* | |
293 | * Signal the remote processor associated with 'channel'. | |
294 | */ | |
295 | static void qcom_smd_signal_channel(struct qcom_smd_channel *channel) | |
296 | { | |
297 | struct qcom_smd_edge *edge = channel->edge; | |
298 | ||
299 | regmap_write(edge->ipc_regmap, edge->ipc_offset, BIT(edge->ipc_bit)); | |
300 | } | |
301 | ||
302 | /* | |
303 | * Initialize the tx channel info | |
304 | */ | |
305 | static void qcom_smd_channel_reset(struct qcom_smd_channel *channel) | |
306 | { | |
307 | SET_TX_CHANNEL_INFO(channel, state, SMD_CHANNEL_CLOSED); | |
308 | SET_TX_CHANNEL_INFO(channel, fDSR, 0); | |
309 | SET_TX_CHANNEL_INFO(channel, fCTS, 0); | |
310 | SET_TX_CHANNEL_INFO(channel, fCD, 0); | |
311 | SET_TX_CHANNEL_INFO(channel, fRI, 0); | |
312 | SET_TX_CHANNEL_INFO(channel, fHEAD, 0); | |
313 | SET_TX_CHANNEL_INFO(channel, fTAIL, 0); | |
314 | SET_TX_CHANNEL_INFO(channel, fSTATE, 1); | |
208487a8 | 315 | SET_TX_CHANNEL_INFO(channel, fBLOCKREADINTR, 1); |
f2ab3298 BA |
316 | SET_TX_CHANNEL_INFO(channel, head, 0); |
317 | SET_TX_CHANNEL_INFO(channel, tail, 0); | |
318 | ||
319 | qcom_smd_signal_channel(channel); | |
320 | ||
321 | channel->state = SMD_CHANNEL_CLOSED; | |
322 | channel->pkt_size = 0; | |
323 | } | |
324 | ||
325 | /* | |
326 | * Calculate the amount of data available in the rx fifo | |
327 | */ | |
328 | static size_t qcom_smd_channel_get_rx_avail(struct qcom_smd_channel *channel) | |
329 | { | |
330 | unsigned head; | |
331 | unsigned tail; | |
332 | ||
333 | head = GET_RX_CHANNEL_INFO(channel, head); | |
334 | tail = GET_RX_CHANNEL_INFO(channel, tail); | |
335 | ||
336 | return (head - tail) & (channel->fifo_size - 1); | |
337 | } | |
338 | ||
339 | /* | |
340 | * Set tx channel state and inform the remote processor | |
341 | */ | |
342 | static void qcom_smd_channel_set_state(struct qcom_smd_channel *channel, | |
343 | int state) | |
344 | { | |
345 | struct qcom_smd_edge *edge = channel->edge; | |
346 | bool is_open = state == SMD_CHANNEL_OPENED; | |
347 | ||
348 | if (channel->state == state) | |
349 | return; | |
350 | ||
351 | dev_dbg(edge->smd->dev, "set_state(%s, %d)\n", channel->name, state); | |
352 | ||
353 | SET_TX_CHANNEL_INFO(channel, fDSR, is_open); | |
354 | SET_TX_CHANNEL_INFO(channel, fCTS, is_open); | |
355 | SET_TX_CHANNEL_INFO(channel, fCD, is_open); | |
356 | ||
357 | SET_TX_CHANNEL_INFO(channel, state, state); | |
358 | SET_TX_CHANNEL_INFO(channel, fSTATE, 1); | |
359 | ||
360 | channel->state = state; | |
361 | qcom_smd_signal_channel(channel); | |
362 | } | |
363 | ||
364 | /* | |
365 | * Copy count bytes of data using 32bit accesses, if that's required. | |
366 | */ | |
367 | static void smd_copy_to_fifo(void __iomem *_dst, | |
368 | const void *_src, | |
369 | size_t count, | |
370 | bool word_aligned) | |
371 | { | |
372 | u32 *dst = (u32 *)_dst; | |
373 | u32 *src = (u32 *)_src; | |
374 | ||
375 | if (word_aligned) { | |
376 | count /= sizeof(u32); | |
377 | while (count--) | |
378 | writel_relaxed(*src++, dst++); | |
379 | } else { | |
380 | memcpy_toio(_dst, _src, count); | |
381 | } | |
382 | } | |
383 | ||
384 | /* | |
385 | * Copy count bytes of data using 32bit accesses, if that is required. | |
386 | */ | |
387 | static void smd_copy_from_fifo(void *_dst, | |
388 | const void __iomem *_src, | |
389 | size_t count, | |
390 | bool word_aligned) | |
391 | { | |
392 | u32 *dst = (u32 *)_dst; | |
393 | u32 *src = (u32 *)_src; | |
394 | ||
395 | if (word_aligned) { | |
396 | count /= sizeof(u32); | |
397 | while (count--) | |
398 | *dst++ = readl_relaxed(src++); | |
399 | } else { | |
400 | memcpy_fromio(_dst, _src, count); | |
401 | } | |
402 | } | |
403 | ||
404 | /* | |
405 | * Read count bytes of data from the rx fifo into buf, but don't advance the | |
406 | * tail. | |
407 | */ | |
408 | static size_t qcom_smd_channel_peek(struct qcom_smd_channel *channel, | |
409 | void *buf, size_t count) | |
410 | { | |
411 | bool word_aligned; | |
412 | unsigned tail; | |
413 | size_t len; | |
414 | ||
415 | word_aligned = channel->rx_info_word != NULL; | |
416 | tail = GET_RX_CHANNEL_INFO(channel, tail); | |
417 | ||
418 | len = min_t(size_t, count, channel->fifo_size - tail); | |
419 | if (len) { | |
420 | smd_copy_from_fifo(buf, | |
421 | channel->rx_fifo + tail, | |
422 | len, | |
423 | word_aligned); | |
424 | } | |
425 | ||
426 | if (len != count) { | |
427 | smd_copy_from_fifo(buf + len, | |
428 | channel->rx_fifo, | |
429 | count - len, | |
430 | word_aligned); | |
431 | } | |
432 | ||
433 | return count; | |
434 | } | |
435 | ||
436 | /* | |
437 | * Advance the rx tail by count bytes. | |
438 | */ | |
439 | static void qcom_smd_channel_advance(struct qcom_smd_channel *channel, | |
440 | size_t count) | |
441 | { | |
442 | unsigned tail; | |
443 | ||
444 | tail = GET_RX_CHANNEL_INFO(channel, tail); | |
445 | tail += count; | |
446 | tail &= (channel->fifo_size - 1); | |
447 | SET_RX_CHANNEL_INFO(channel, tail, tail); | |
448 | } | |
449 | ||
450 | /* | |
451 | * Read out a single packet from the rx fifo and deliver it to the device | |
452 | */ | |
453 | static int qcom_smd_channel_recv_single(struct qcom_smd_channel *channel) | |
454 | { | |
455 | struct qcom_smd_device *qsdev = channel->qsdev; | |
456 | unsigned tail; | |
457 | size_t len; | |
458 | void *ptr; | |
459 | int ret; | |
460 | ||
461 | if (!channel->cb) | |
462 | return 0; | |
463 | ||
464 | tail = GET_RX_CHANNEL_INFO(channel, tail); | |
465 | ||
466 | /* Use bounce buffer if the data wraps */ | |
467 | if (tail + channel->pkt_size >= channel->fifo_size) { | |
468 | ptr = channel->bounce_buffer; | |
469 | len = qcom_smd_channel_peek(channel, ptr, channel->pkt_size); | |
470 | } else { | |
471 | ptr = channel->rx_fifo + tail; | |
472 | len = channel->pkt_size; | |
473 | } | |
474 | ||
475 | ret = channel->cb(qsdev, ptr, len); | |
476 | if (ret < 0) | |
477 | return ret; | |
478 | ||
479 | /* Only forward the tail if the client consumed the data */ | |
480 | qcom_smd_channel_advance(channel, len); | |
481 | ||
482 | channel->pkt_size = 0; | |
483 | ||
484 | return 0; | |
485 | } | |
486 | ||
487 | /* | |
488 | * Per channel interrupt handling | |
489 | */ | |
490 | static bool qcom_smd_channel_intr(struct qcom_smd_channel *channel) | |
491 | { | |
492 | bool need_state_scan = false; | |
493 | int remote_state; | |
494 | u32 pktlen; | |
495 | int avail; | |
496 | int ret; | |
497 | ||
498 | /* Handle state changes */ | |
499 | remote_state = GET_RX_CHANNEL_INFO(channel, state); | |
500 | if (remote_state != channel->remote_state) { | |
501 | channel->remote_state = remote_state; | |
502 | need_state_scan = true; | |
503 | } | |
504 | /* Indicate that we have seen any state change */ | |
505 | SET_RX_CHANNEL_INFO(channel, fSTATE, 0); | |
506 | ||
507 | /* Signal waiting qcom_smd_send() about the interrupt */ | |
508 | if (!GET_TX_CHANNEL_INFO(channel, fBLOCKREADINTR)) | |
509 | wake_up_interruptible(&channel->fblockread_event); | |
510 | ||
511 | /* Don't consume any data until we've opened the channel */ | |
512 | if (channel->state != SMD_CHANNEL_OPENED) | |
513 | goto out; | |
514 | ||
515 | /* Indicate that we've seen the new data */ | |
516 | SET_RX_CHANNEL_INFO(channel, fHEAD, 0); | |
517 | ||
518 | /* Consume data */ | |
519 | for (;;) { | |
520 | avail = qcom_smd_channel_get_rx_avail(channel); | |
521 | ||
522 | if (!channel->pkt_size && avail >= SMD_PACKET_HEADER_LEN) { | |
523 | qcom_smd_channel_peek(channel, &pktlen, sizeof(pktlen)); | |
524 | qcom_smd_channel_advance(channel, SMD_PACKET_HEADER_LEN); | |
525 | channel->pkt_size = pktlen; | |
526 | } else if (channel->pkt_size && avail >= channel->pkt_size) { | |
527 | ret = qcom_smd_channel_recv_single(channel); | |
528 | if (ret) | |
529 | break; | |
530 | } else { | |
531 | break; | |
532 | } | |
533 | } | |
534 | ||
535 | /* Indicate that we have seen and updated tail */ | |
536 | SET_RX_CHANNEL_INFO(channel, fTAIL, 1); | |
537 | ||
538 | /* Signal the remote that we've consumed the data (if requested) */ | |
539 | if (!GET_RX_CHANNEL_INFO(channel, fBLOCKREADINTR)) { | |
540 | /* Ensure ordering of channel info updates */ | |
541 | wmb(); | |
542 | ||
543 | qcom_smd_signal_channel(channel); | |
544 | } | |
545 | ||
546 | out: | |
547 | return need_state_scan; | |
548 | } | |
549 | ||
550 | /* | |
551 | * The edge interrupts are triggered by the remote processor on state changes, | |
552 | * channel info updates or when new channels are created. | |
553 | */ | |
554 | static irqreturn_t qcom_smd_edge_intr(int irq, void *data) | |
555 | { | |
556 | struct qcom_smd_edge *edge = data; | |
557 | struct qcom_smd_channel *channel; | |
558 | unsigned available; | |
559 | bool kick_worker = false; | |
560 | ||
561 | /* | |
562 | * Handle state changes or data on each of the channels on this edge | |
563 | */ | |
564 | spin_lock(&edge->channels_lock); | |
565 | list_for_each_entry(channel, &edge->channels, list) { | |
566 | spin_lock(&channel->recv_lock); | |
567 | kick_worker |= qcom_smd_channel_intr(channel); | |
568 | spin_unlock(&channel->recv_lock); | |
569 | } | |
570 | spin_unlock(&edge->channels_lock); | |
571 | ||
572 | /* | |
573 | * Creating a new channel requires allocating an smem entry, so we only | |
574 | * have to scan if the amount of available space in smem have changed | |
575 | * since last scan. | |
576 | */ | |
93dbed91 | 577 | available = qcom_smem_get_free_space(edge->remote_pid); |
f2ab3298 BA |
578 | if (available != edge->smem_available) { |
579 | edge->smem_available = available; | |
580 | edge->need_rescan = true; | |
581 | kick_worker = true; | |
582 | } | |
583 | ||
584 | if (kick_worker) | |
585 | schedule_work(&edge->work); | |
586 | ||
587 | return IRQ_HANDLED; | |
588 | } | |
589 | ||
590 | /* | |
591 | * Delivers any outstanding packets in the rx fifo, can be used after probe of | |
592 | * the clients to deliver any packets that wasn't delivered before the client | |
593 | * was setup. | |
594 | */ | |
595 | static void qcom_smd_channel_resume(struct qcom_smd_channel *channel) | |
596 | { | |
597 | unsigned long flags; | |
598 | ||
599 | spin_lock_irqsave(&channel->recv_lock, flags); | |
600 | qcom_smd_channel_intr(channel); | |
601 | spin_unlock_irqrestore(&channel->recv_lock, flags); | |
602 | } | |
603 | ||
604 | /* | |
605 | * Calculate how much space is available in the tx fifo. | |
606 | */ | |
607 | static size_t qcom_smd_get_tx_avail(struct qcom_smd_channel *channel) | |
608 | { | |
609 | unsigned head; | |
610 | unsigned tail; | |
611 | unsigned mask = channel->fifo_size - 1; | |
612 | ||
613 | head = GET_TX_CHANNEL_INFO(channel, head); | |
614 | tail = GET_TX_CHANNEL_INFO(channel, tail); | |
615 | ||
616 | return mask - ((head - tail) & mask); | |
617 | } | |
618 | ||
619 | /* | |
620 | * Write count bytes of data into channel, possibly wrapping in the ring buffer | |
621 | */ | |
622 | static int qcom_smd_write_fifo(struct qcom_smd_channel *channel, | |
623 | const void *data, | |
624 | size_t count) | |
625 | { | |
626 | bool word_aligned; | |
627 | unsigned head; | |
628 | size_t len; | |
629 | ||
630 | word_aligned = channel->tx_info_word != NULL; | |
631 | head = GET_TX_CHANNEL_INFO(channel, head); | |
632 | ||
633 | len = min_t(size_t, count, channel->fifo_size - head); | |
634 | if (len) { | |
635 | smd_copy_to_fifo(channel->tx_fifo + head, | |
636 | data, | |
637 | len, | |
638 | word_aligned); | |
639 | } | |
640 | ||
641 | if (len != count) { | |
642 | smd_copy_to_fifo(channel->tx_fifo, | |
643 | data + len, | |
644 | count - len, | |
645 | word_aligned); | |
646 | } | |
647 | ||
648 | head += count; | |
649 | head &= (channel->fifo_size - 1); | |
650 | SET_TX_CHANNEL_INFO(channel, head, head); | |
651 | ||
652 | return count; | |
653 | } | |
654 | ||
655 | /** | |
656 | * qcom_smd_send - write data to smd channel | |
657 | * @channel: channel handle | |
658 | * @data: buffer of data to write | |
659 | * @len: number of bytes to write | |
660 | * | |
661 | * This is a blocking write of len bytes into the channel's tx ring buffer and | |
662 | * signal the remote end. It will sleep until there is enough space available | |
663 | * in the tx buffer, utilizing the fBLOCKREADINTR signaling mechanism to avoid | |
664 | * polling. | |
665 | */ | |
666 | int qcom_smd_send(struct qcom_smd_channel *channel, const void *data, int len) | |
667 | { | |
668 | u32 hdr[5] = {len,}; | |
669 | int tlen = sizeof(hdr) + len; | |
670 | int ret; | |
671 | ||
672 | /* Word aligned channels only accept word size aligned data */ | |
673 | if (channel->rx_info_word != NULL && len % 4) | |
674 | return -EINVAL; | |
675 | ||
676 | ret = mutex_lock_interruptible(&channel->tx_lock); | |
677 | if (ret) | |
678 | return ret; | |
679 | ||
680 | while (qcom_smd_get_tx_avail(channel) < tlen) { | |
681 | if (channel->state != SMD_CHANNEL_OPENED) { | |
682 | ret = -EPIPE; | |
683 | goto out; | |
684 | } | |
685 | ||
208487a8 | 686 | SET_TX_CHANNEL_INFO(channel, fBLOCKREADINTR, 0); |
f2ab3298 BA |
687 | |
688 | ret = wait_event_interruptible(channel->fblockread_event, | |
689 | qcom_smd_get_tx_avail(channel) >= tlen || | |
690 | channel->state != SMD_CHANNEL_OPENED); | |
691 | if (ret) | |
692 | goto out; | |
693 | ||
208487a8 | 694 | SET_TX_CHANNEL_INFO(channel, fBLOCKREADINTR, 1); |
f2ab3298 BA |
695 | } |
696 | ||
697 | SET_TX_CHANNEL_INFO(channel, fTAIL, 0); | |
698 | ||
699 | qcom_smd_write_fifo(channel, hdr, sizeof(hdr)); | |
700 | qcom_smd_write_fifo(channel, data, len); | |
701 | ||
702 | SET_TX_CHANNEL_INFO(channel, fHEAD, 1); | |
703 | ||
704 | /* Ensure ordering of channel info updates */ | |
705 | wmb(); | |
706 | ||
707 | qcom_smd_signal_channel(channel); | |
708 | ||
709 | out: | |
710 | mutex_unlock(&channel->tx_lock); | |
711 | ||
712 | return ret; | |
713 | } | |
714 | EXPORT_SYMBOL(qcom_smd_send); | |
715 | ||
716 | static struct qcom_smd_device *to_smd_device(struct device *dev) | |
717 | { | |
718 | return container_of(dev, struct qcom_smd_device, dev); | |
719 | } | |
720 | ||
721 | static struct qcom_smd_driver *to_smd_driver(struct device *dev) | |
722 | { | |
723 | struct qcom_smd_device *qsdev = to_smd_device(dev); | |
724 | ||
725 | return container_of(qsdev->dev.driver, struct qcom_smd_driver, driver); | |
726 | } | |
727 | ||
728 | static int qcom_smd_dev_match(struct device *dev, struct device_driver *drv) | |
729 | { | |
730 | return of_driver_match_device(dev, drv); | |
731 | } | |
732 | ||
733 | /* | |
734 | * Probe the smd client. | |
735 | * | |
736 | * The remote side have indicated that it want the channel to be opened, so | |
737 | * complete the state handshake and probe our client driver. | |
738 | */ | |
739 | static int qcom_smd_dev_probe(struct device *dev) | |
740 | { | |
741 | struct qcom_smd_device *qsdev = to_smd_device(dev); | |
742 | struct qcom_smd_driver *qsdrv = to_smd_driver(dev); | |
743 | struct qcom_smd_channel *channel = qsdev->channel; | |
744 | size_t bb_size; | |
745 | int ret; | |
746 | ||
747 | /* | |
748 | * Packets are maximum 4k, but reduce if the fifo is smaller | |
749 | */ | |
750 | bb_size = min(channel->fifo_size, SZ_4K); | |
751 | channel->bounce_buffer = kmalloc(bb_size, GFP_KERNEL); | |
752 | if (!channel->bounce_buffer) | |
753 | return -ENOMEM; | |
754 | ||
755 | channel->cb = qsdrv->callback; | |
756 | ||
757 | qcom_smd_channel_set_state(channel, SMD_CHANNEL_OPENING); | |
758 | ||
759 | qcom_smd_channel_set_state(channel, SMD_CHANNEL_OPENED); | |
760 | ||
761 | ret = qsdrv->probe(qsdev); | |
762 | if (ret) | |
763 | goto err; | |
764 | ||
765 | qcom_smd_channel_resume(channel); | |
766 | ||
767 | return 0; | |
768 | ||
769 | err: | |
770 | dev_err(&qsdev->dev, "probe failed\n"); | |
771 | ||
772 | channel->cb = NULL; | |
773 | kfree(channel->bounce_buffer); | |
774 | channel->bounce_buffer = NULL; | |
775 | ||
776 | qcom_smd_channel_set_state(channel, SMD_CHANNEL_CLOSED); | |
777 | return ret; | |
778 | } | |
779 | ||
780 | /* | |
781 | * Remove the smd client. | |
782 | * | |
783 | * The channel is going away, for some reason, so remove the smd client and | |
784 | * reset the channel state. | |
785 | */ | |
786 | static int qcom_smd_dev_remove(struct device *dev) | |
787 | { | |
788 | struct qcom_smd_device *qsdev = to_smd_device(dev); | |
789 | struct qcom_smd_driver *qsdrv = to_smd_driver(dev); | |
790 | struct qcom_smd_channel *channel = qsdev->channel; | |
791 | unsigned long flags; | |
792 | ||
793 | qcom_smd_channel_set_state(channel, SMD_CHANNEL_CLOSING); | |
794 | ||
795 | /* | |
796 | * Make sure we don't race with the code receiving data. | |
797 | */ | |
798 | spin_lock_irqsave(&channel->recv_lock, flags); | |
799 | channel->cb = NULL; | |
800 | spin_unlock_irqrestore(&channel->recv_lock, flags); | |
801 | ||
802 | /* Wake up any sleepers in qcom_smd_send() */ | |
803 | wake_up_interruptible(&channel->fblockread_event); | |
804 | ||
805 | /* | |
806 | * We expect that the client might block in remove() waiting for any | |
807 | * outstanding calls to qcom_smd_send() to wake up and finish. | |
808 | */ | |
809 | if (qsdrv->remove) | |
810 | qsdrv->remove(qsdev); | |
811 | ||
812 | /* | |
813 | * The client is now gone, cleanup and reset the channel state. | |
814 | */ | |
815 | channel->qsdev = NULL; | |
816 | kfree(channel->bounce_buffer); | |
817 | channel->bounce_buffer = NULL; | |
818 | ||
819 | qcom_smd_channel_set_state(channel, SMD_CHANNEL_CLOSED); | |
820 | ||
821 | qcom_smd_channel_reset(channel); | |
822 | ||
823 | return 0; | |
824 | } | |
825 | ||
826 | static struct bus_type qcom_smd_bus = { | |
827 | .name = "qcom_smd", | |
828 | .match = qcom_smd_dev_match, | |
829 | .probe = qcom_smd_dev_probe, | |
830 | .remove = qcom_smd_dev_remove, | |
831 | }; | |
832 | ||
833 | /* | |
834 | * Release function for the qcom_smd_device object. | |
835 | */ | |
836 | static void qcom_smd_release_device(struct device *dev) | |
837 | { | |
838 | struct qcom_smd_device *qsdev = to_smd_device(dev); | |
839 | ||
840 | kfree(qsdev); | |
841 | } | |
842 | ||
843 | /* | |
844 | * Finds the device_node for the smd child interested in this channel. | |
845 | */ | |
846 | static struct device_node *qcom_smd_match_channel(struct device_node *edge_node, | |
847 | const char *channel) | |
848 | { | |
849 | struct device_node *child; | |
850 | const char *name; | |
851 | const char *key; | |
852 | int ret; | |
853 | ||
854 | for_each_available_child_of_node(edge_node, child) { | |
855 | key = "qcom,smd-channels"; | |
856 | ret = of_property_read_string(child, key, &name); | |
857 | if (ret) { | |
858 | of_node_put(child); | |
859 | continue; | |
860 | } | |
861 | ||
862 | if (strcmp(name, channel) == 0) | |
863 | return child; | |
864 | } | |
865 | ||
866 | return NULL; | |
867 | } | |
868 | ||
869 | /* | |
870 | * Create a smd client device for channel that is being opened. | |
871 | */ | |
872 | static int qcom_smd_create_device(struct qcom_smd_channel *channel) | |
873 | { | |
874 | struct qcom_smd_device *qsdev; | |
875 | struct qcom_smd_edge *edge = channel->edge; | |
876 | struct device_node *node; | |
877 | struct qcom_smd *smd = edge->smd; | |
878 | int ret; | |
879 | ||
880 | if (channel->qsdev) | |
881 | return -EEXIST; | |
882 | ||
883 | node = qcom_smd_match_channel(edge->of_node, channel->name); | |
884 | if (!node) { | |
885 | dev_dbg(smd->dev, "no match for '%s'\n", channel->name); | |
886 | return -ENXIO; | |
887 | } | |
888 | ||
889 | dev_dbg(smd->dev, "registering '%s'\n", channel->name); | |
890 | ||
891 | qsdev = kzalloc(sizeof(*qsdev), GFP_KERNEL); | |
892 | if (!qsdev) | |
893 | return -ENOMEM; | |
894 | ||
895 | dev_set_name(&qsdev->dev, "%s.%s", edge->of_node->name, node->name); | |
896 | qsdev->dev.parent = smd->dev; | |
897 | qsdev->dev.bus = &qcom_smd_bus; | |
898 | qsdev->dev.release = qcom_smd_release_device; | |
899 | qsdev->dev.of_node = node; | |
900 | ||
901 | qsdev->channel = channel; | |
902 | ||
903 | channel->qsdev = qsdev; | |
904 | ||
905 | ret = device_register(&qsdev->dev); | |
906 | if (ret) { | |
907 | dev_err(smd->dev, "device_register failed: %d\n", ret); | |
908 | put_device(&qsdev->dev); | |
909 | } | |
910 | ||
911 | return ret; | |
912 | } | |
913 | ||
914 | /* | |
915 | * Destroy a smd client device for a channel that's going away. | |
916 | */ | |
917 | static void qcom_smd_destroy_device(struct qcom_smd_channel *channel) | |
918 | { | |
919 | struct device *dev; | |
920 | ||
921 | BUG_ON(!channel->qsdev); | |
922 | ||
923 | dev = &channel->qsdev->dev; | |
924 | ||
925 | device_unregister(dev); | |
926 | of_node_put(dev->of_node); | |
927 | put_device(dev); | |
928 | } | |
929 | ||
930 | /** | |
931 | * qcom_smd_driver_register - register a smd driver | |
932 | * @qsdrv: qcom_smd_driver struct | |
933 | */ | |
934 | int qcom_smd_driver_register(struct qcom_smd_driver *qsdrv) | |
935 | { | |
936 | qsdrv->driver.bus = &qcom_smd_bus; | |
937 | return driver_register(&qsdrv->driver); | |
938 | } | |
939 | EXPORT_SYMBOL(qcom_smd_driver_register); | |
940 | ||
941 | /** | |
942 | * qcom_smd_driver_unregister - unregister a smd driver | |
943 | * @qsdrv: qcom_smd_driver struct | |
944 | */ | |
945 | void qcom_smd_driver_unregister(struct qcom_smd_driver *qsdrv) | |
946 | { | |
947 | driver_unregister(&qsdrv->driver); | |
948 | } | |
949 | EXPORT_SYMBOL(qcom_smd_driver_unregister); | |
950 | ||
951 | /* | |
952 | * Allocate the qcom_smd_channel object for a newly found smd channel, | |
953 | * retrieving and validating the smem items involved. | |
954 | */ | |
955 | static struct qcom_smd_channel *qcom_smd_create_channel(struct qcom_smd_edge *edge, | |
956 | unsigned smem_info_item, | |
957 | unsigned smem_fifo_item, | |
958 | char *name) | |
959 | { | |
960 | struct qcom_smd_channel *channel; | |
961 | struct qcom_smd *smd = edge->smd; | |
962 | size_t fifo_size; | |
963 | size_t info_size; | |
964 | void *fifo_base; | |
965 | void *info; | |
966 | int ret; | |
967 | ||
968 | channel = devm_kzalloc(smd->dev, sizeof(*channel), GFP_KERNEL); | |
969 | if (!channel) | |
970 | return ERR_PTR(-ENOMEM); | |
971 | ||
972 | channel->edge = edge; | |
973 | channel->name = devm_kstrdup(smd->dev, name, GFP_KERNEL); | |
974 | if (!channel->name) | |
975 | return ERR_PTR(-ENOMEM); | |
976 | ||
977 | mutex_init(&channel->tx_lock); | |
978 | spin_lock_init(&channel->recv_lock); | |
979 | init_waitqueue_head(&channel->fblockread_event); | |
980 | ||
93dbed91 AG |
981 | ret = qcom_smem_get(edge->remote_pid, smem_info_item, (void **)&info, |
982 | &info_size); | |
f2ab3298 BA |
983 | if (ret) |
984 | goto free_name_and_channel; | |
985 | ||
986 | /* | |
987 | * Use the size of the item to figure out which channel info struct to | |
988 | * use. | |
989 | */ | |
990 | if (info_size == 2 * sizeof(struct smd_channel_info_word)) { | |
991 | channel->tx_info_word = info; | |
992 | channel->rx_info_word = info + sizeof(struct smd_channel_info_word); | |
993 | } else if (info_size == 2 * sizeof(struct smd_channel_info)) { | |
994 | channel->tx_info = info; | |
995 | channel->rx_info = info + sizeof(struct smd_channel_info); | |
996 | } else { | |
997 | dev_err(smd->dev, | |
998 | "channel info of size %zu not supported\n", info_size); | |
999 | ret = -EINVAL; | |
1000 | goto free_name_and_channel; | |
1001 | } | |
1002 | ||
93dbed91 AG |
1003 | ret = qcom_smem_get(edge->remote_pid, smem_fifo_item, &fifo_base, |
1004 | &fifo_size); | |
f2ab3298 BA |
1005 | if (ret) |
1006 | goto free_name_and_channel; | |
1007 | ||
1008 | /* The channel consist of a rx and tx fifo of equal size */ | |
1009 | fifo_size /= 2; | |
1010 | ||
1011 | dev_dbg(smd->dev, "new channel '%s' info-size: %zu fifo-size: %zu\n", | |
1012 | name, info_size, fifo_size); | |
1013 | ||
1014 | channel->tx_fifo = fifo_base; | |
1015 | channel->rx_fifo = fifo_base + fifo_size; | |
1016 | channel->fifo_size = fifo_size; | |
1017 | ||
1018 | qcom_smd_channel_reset(channel); | |
1019 | ||
1020 | return channel; | |
1021 | ||
1022 | free_name_and_channel: | |
1023 | devm_kfree(smd->dev, channel->name); | |
1024 | devm_kfree(smd->dev, channel); | |
1025 | ||
1026 | return ERR_PTR(ret); | |
1027 | } | |
1028 | ||
1029 | /* | |
1030 | * Scans the allocation table for any newly allocated channels, calls | |
1031 | * qcom_smd_create_channel() to create representations of these and add | |
1032 | * them to the edge's list of channels. | |
1033 | */ | |
1034 | static void qcom_discover_channels(struct qcom_smd_edge *edge) | |
1035 | { | |
1036 | struct qcom_smd_alloc_entry *alloc_tbl; | |
1037 | struct qcom_smd_alloc_entry *entry; | |
1038 | struct qcom_smd_channel *channel; | |
1039 | struct qcom_smd *smd = edge->smd; | |
1040 | unsigned long flags; | |
1041 | unsigned fifo_id; | |
1042 | unsigned info_id; | |
1043 | int ret; | |
1044 | int tbl; | |
1045 | int i; | |
1046 | ||
1047 | for (tbl = 0; tbl < SMD_ALLOC_TBL_COUNT; tbl++) { | |
93dbed91 | 1048 | ret = qcom_smem_get(edge->remote_pid, |
f2ab3298 BA |
1049 | smem_items[tbl].alloc_tbl_id, |
1050 | (void **)&alloc_tbl, | |
1051 | NULL); | |
1052 | if (ret < 0) | |
1053 | continue; | |
1054 | ||
1055 | for (i = 0; i < SMD_ALLOC_TBL_SIZE; i++) { | |
1056 | entry = &alloc_tbl[i]; | |
1057 | if (test_bit(i, edge->allocated[tbl])) | |
1058 | continue; | |
1059 | ||
1060 | if (entry->ref_count == 0) | |
1061 | continue; | |
1062 | ||
1063 | if (!entry->name[0]) | |
1064 | continue; | |
1065 | ||
1066 | if (!(entry->flags & SMD_CHANNEL_FLAGS_PACKET)) | |
1067 | continue; | |
1068 | ||
1069 | if ((entry->flags & SMD_CHANNEL_FLAGS_EDGE_MASK) != edge->edge_id) | |
1070 | continue; | |
1071 | ||
1072 | info_id = smem_items[tbl].info_base_id + entry->cid; | |
1073 | fifo_id = smem_items[tbl].fifo_base_id + entry->cid; | |
1074 | ||
1075 | channel = qcom_smd_create_channel(edge, info_id, fifo_id, entry->name); | |
1076 | if (IS_ERR(channel)) | |
1077 | continue; | |
1078 | ||
1079 | spin_lock_irqsave(&edge->channels_lock, flags); | |
1080 | list_add(&channel->list, &edge->channels); | |
1081 | spin_unlock_irqrestore(&edge->channels_lock, flags); | |
1082 | ||
1083 | dev_dbg(smd->dev, "new channel found: '%s'\n", channel->name); | |
1084 | set_bit(i, edge->allocated[tbl]); | |
1085 | } | |
1086 | } | |
1087 | ||
1088 | schedule_work(&edge->work); | |
1089 | } | |
1090 | ||
1091 | /* | |
1092 | * This per edge worker scans smem for any new channels and register these. It | |
1093 | * then scans all registered channels for state changes that should be handled | |
1094 | * by creating or destroying smd client devices for the registered channels. | |
1095 | * | |
1096 | * LOCKING: edge->channels_lock is not needed to be held during the traversal | |
1097 | * of the channels list as it's done synchronously with the only writer. | |
1098 | */ | |
1099 | static void qcom_channel_state_worker(struct work_struct *work) | |
1100 | { | |
1101 | struct qcom_smd_channel *channel; | |
1102 | struct qcom_smd_edge *edge = container_of(work, | |
1103 | struct qcom_smd_edge, | |
1104 | work); | |
1105 | unsigned remote_state; | |
1106 | ||
1107 | /* | |
1108 | * Rescan smem if we have reason to belive that there are new channels. | |
1109 | */ | |
1110 | if (edge->need_rescan) { | |
1111 | edge->need_rescan = false; | |
1112 | qcom_discover_channels(edge); | |
1113 | } | |
1114 | ||
1115 | /* | |
1116 | * Register a device for any closed channel where the remote processor | |
1117 | * is showing interest in opening the channel. | |
1118 | */ | |
1119 | list_for_each_entry(channel, &edge->channels, list) { | |
1120 | if (channel->state != SMD_CHANNEL_CLOSED) | |
1121 | continue; | |
1122 | ||
1123 | remote_state = GET_RX_CHANNEL_INFO(channel, state); | |
1124 | if (remote_state != SMD_CHANNEL_OPENING && | |
1125 | remote_state != SMD_CHANNEL_OPENED) | |
1126 | continue; | |
1127 | ||
1128 | qcom_smd_create_device(channel); | |
1129 | } | |
1130 | ||
1131 | /* | |
1132 | * Unregister the device for any channel that is opened where the | |
1133 | * remote processor is closing the channel. | |
1134 | */ | |
1135 | list_for_each_entry(channel, &edge->channels, list) { | |
1136 | if (channel->state != SMD_CHANNEL_OPENING && | |
1137 | channel->state != SMD_CHANNEL_OPENED) | |
1138 | continue; | |
1139 | ||
1140 | remote_state = GET_RX_CHANNEL_INFO(channel, state); | |
1141 | if (remote_state == SMD_CHANNEL_OPENING || | |
1142 | remote_state == SMD_CHANNEL_OPENED) | |
1143 | continue; | |
1144 | ||
1145 | qcom_smd_destroy_device(channel); | |
1146 | } | |
1147 | } | |
1148 | ||
1149 | /* | |
1150 | * Parses an of_node describing an edge. | |
1151 | */ | |
1152 | static int qcom_smd_parse_edge(struct device *dev, | |
1153 | struct device_node *node, | |
1154 | struct qcom_smd_edge *edge) | |
1155 | { | |
1156 | struct device_node *syscon_np; | |
1157 | const char *key; | |
1158 | int irq; | |
1159 | int ret; | |
1160 | ||
1161 | INIT_LIST_HEAD(&edge->channels); | |
1162 | spin_lock_init(&edge->channels_lock); | |
1163 | ||
1164 | INIT_WORK(&edge->work, qcom_channel_state_worker); | |
1165 | ||
1166 | edge->of_node = of_node_get(node); | |
1167 | ||
1168 | irq = irq_of_parse_and_map(node, 0); | |
1169 | if (irq < 0) { | |
1170 | dev_err(dev, "required smd interrupt missing\n"); | |
1171 | return -EINVAL; | |
1172 | } | |
1173 | ||
1174 | ret = devm_request_irq(dev, irq, | |
1175 | qcom_smd_edge_intr, IRQF_TRIGGER_RISING, | |
1176 | node->name, edge); | |
1177 | if (ret) { | |
1178 | dev_err(dev, "failed to request smd irq\n"); | |
1179 | return ret; | |
1180 | } | |
1181 | ||
1182 | edge->irq = irq; | |
1183 | ||
1184 | key = "qcom,smd-edge"; | |
1185 | ret = of_property_read_u32(node, key, &edge->edge_id); | |
1186 | if (ret) { | |
1187 | dev_err(dev, "edge missing %s property\n", key); | |
1188 | return -EINVAL; | |
1189 | } | |
1190 | ||
93dbed91 AG |
1191 | edge->remote_pid = QCOM_SMEM_HOST_ANY; |
1192 | key = "qcom,remote-pid"; | |
1193 | of_property_read_u32(node, key, &edge->remote_pid); | |
1194 | ||
f2ab3298 BA |
1195 | syscon_np = of_parse_phandle(node, "qcom,ipc", 0); |
1196 | if (!syscon_np) { | |
1197 | dev_err(dev, "no qcom,ipc node\n"); | |
1198 | return -ENODEV; | |
1199 | } | |
1200 | ||
1201 | edge->ipc_regmap = syscon_node_to_regmap(syscon_np); | |
1202 | if (IS_ERR(edge->ipc_regmap)) | |
1203 | return PTR_ERR(edge->ipc_regmap); | |
1204 | ||
1205 | key = "qcom,ipc"; | |
1206 | ret = of_property_read_u32_index(node, key, 1, &edge->ipc_offset); | |
1207 | if (ret < 0) { | |
1208 | dev_err(dev, "no offset in %s\n", key); | |
1209 | return -EINVAL; | |
1210 | } | |
1211 | ||
1212 | ret = of_property_read_u32_index(node, key, 2, &edge->ipc_bit); | |
1213 | if (ret < 0) { | |
1214 | dev_err(dev, "no bit in %s\n", key); | |
1215 | return -EINVAL; | |
1216 | } | |
1217 | ||
1218 | return 0; | |
1219 | } | |
1220 | ||
1221 | static int qcom_smd_probe(struct platform_device *pdev) | |
1222 | { | |
1223 | struct qcom_smd_edge *edge; | |
1224 | struct device_node *node; | |
1225 | struct qcom_smd *smd; | |
1226 | size_t array_size; | |
1227 | int num_edges; | |
1228 | int ret; | |
1229 | int i = 0; | |
1230 | ||
1231 | /* Wait for smem */ | |
1232 | ret = qcom_smem_get(QCOM_SMEM_HOST_ANY, smem_items[0].alloc_tbl_id, NULL, NULL); | |
1233 | if (ret == -EPROBE_DEFER) | |
1234 | return ret; | |
1235 | ||
1236 | num_edges = of_get_available_child_count(pdev->dev.of_node); | |
1237 | array_size = sizeof(*smd) + num_edges * sizeof(struct qcom_smd_edge); | |
1238 | smd = devm_kzalloc(&pdev->dev, array_size, GFP_KERNEL); | |
1239 | if (!smd) | |
1240 | return -ENOMEM; | |
1241 | smd->dev = &pdev->dev; | |
1242 | ||
1243 | smd->num_edges = num_edges; | |
1244 | for_each_available_child_of_node(pdev->dev.of_node, node) { | |
1245 | edge = &smd->edges[i++]; | |
1246 | edge->smd = smd; | |
1247 | ||
1248 | ret = qcom_smd_parse_edge(&pdev->dev, node, edge); | |
1249 | if (ret) | |
1250 | continue; | |
1251 | ||
1252 | edge->need_rescan = true; | |
1253 | schedule_work(&edge->work); | |
1254 | } | |
1255 | ||
1256 | platform_set_drvdata(pdev, smd); | |
1257 | ||
1258 | return 0; | |
1259 | } | |
1260 | ||
1261 | /* | |
1262 | * Shut down all smd clients by making sure that each edge stops processing | |
1263 | * events and scanning for new channels, then call destroy on the devices. | |
1264 | */ | |
1265 | static int qcom_smd_remove(struct platform_device *pdev) | |
1266 | { | |
1267 | struct qcom_smd_channel *channel; | |
1268 | struct qcom_smd_edge *edge; | |
1269 | struct qcom_smd *smd = platform_get_drvdata(pdev); | |
1270 | int i; | |
1271 | ||
1272 | for (i = 0; i < smd->num_edges; i++) { | |
1273 | edge = &smd->edges[i]; | |
1274 | ||
1275 | disable_irq(edge->irq); | |
1276 | cancel_work_sync(&edge->work); | |
1277 | ||
1278 | list_for_each_entry(channel, &edge->channels, list) { | |
1279 | if (!channel->qsdev) | |
1280 | continue; | |
1281 | ||
1282 | qcom_smd_destroy_device(channel); | |
1283 | } | |
1284 | } | |
1285 | ||
1286 | return 0; | |
1287 | } | |
1288 | ||
1289 | static const struct of_device_id qcom_smd_of_match[] = { | |
1290 | { .compatible = "qcom,smd" }, | |
1291 | {} | |
1292 | }; | |
1293 | MODULE_DEVICE_TABLE(of, qcom_smd_of_match); | |
1294 | ||
1295 | static struct platform_driver qcom_smd_driver = { | |
1296 | .probe = qcom_smd_probe, | |
1297 | .remove = qcom_smd_remove, | |
1298 | .driver = { | |
1299 | .name = "qcom-smd", | |
1300 | .of_match_table = qcom_smd_of_match, | |
1301 | }, | |
1302 | }; | |
1303 | ||
1304 | static int __init qcom_smd_init(void) | |
1305 | { | |
1306 | int ret; | |
1307 | ||
1308 | ret = bus_register(&qcom_smd_bus); | |
1309 | if (ret) { | |
1310 | pr_err("failed to register smd bus: %d\n", ret); | |
1311 | return ret; | |
1312 | } | |
1313 | ||
1314 | return platform_driver_register(&qcom_smd_driver); | |
1315 | } | |
1316 | postcore_initcall(qcom_smd_init); | |
1317 | ||
1318 | static void __exit qcom_smd_exit(void) | |
1319 | { | |
1320 | platform_driver_unregister(&qcom_smd_driver); | |
1321 | bus_unregister(&qcom_smd_bus); | |
1322 | } | |
1323 | module_exit(qcom_smd_exit); | |
1324 | ||
1325 | MODULE_AUTHOR("Bjorn Andersson <bjorn.andersson@sonymobile.com>"); | |
1326 | MODULE_DESCRIPTION("Qualcomm Shared Memory Driver"); | |
1327 | MODULE_LICENSE("GPL v2"); |