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f2ab3298 BA |
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; | |
f02dc825 | 68 | struct smd_channel_info_pair; |
f2ab3298 | 69 | struct smd_channel_info_word; |
f02dc825 | 70 | struct smd_channel_info_word_pair; |
f2ab3298 BA |
71 | |
72 | #define SMD_ALLOC_TBL_COUNT 2 | |
73 | #define SMD_ALLOC_TBL_SIZE 64 | |
74 | ||
75 | /* | |
76 | * This lists the various smem heap items relevant for the allocation table and | |
77 | * smd channel entries. | |
78 | */ | |
79 | static const struct { | |
80 | unsigned alloc_tbl_id; | |
81 | unsigned info_base_id; | |
82 | unsigned fifo_base_id; | |
83 | } smem_items[SMD_ALLOC_TBL_COUNT] = { | |
84 | { | |
85 | .alloc_tbl_id = 13, | |
86 | .info_base_id = 14, | |
87 | .fifo_base_id = 338 | |
88 | }, | |
89 | { | |
90 | .alloc_tbl_id = 14, | |
91 | .info_base_id = 266, | |
92 | .fifo_base_id = 202, | |
93 | }, | |
94 | }; | |
95 | ||
96 | /** | |
97 | * struct qcom_smd_edge - representing a remote processor | |
98 | * @smd: handle to qcom_smd | |
99 | * @of_node: of_node handle for information related to this edge | |
100 | * @edge_id: identifier of this edge | |
93dbed91 | 101 | * @remote_pid: identifier of remote processor |
f2ab3298 BA |
102 | * @irq: interrupt for signals on this edge |
103 | * @ipc_regmap: regmap handle holding the outgoing ipc register | |
104 | * @ipc_offset: offset within @ipc_regmap of the register for ipc | |
105 | * @ipc_bit: bit in the register at @ipc_offset of @ipc_regmap | |
106 | * @channels: list of all channels detected on this edge | |
107 | * @channels_lock: guard for modifications of @channels | |
108 | * @allocated: array of bitmaps representing already allocated channels | |
109 | * @need_rescan: flag that the @work needs to scan smem for new channels | |
110 | * @smem_available: last available amount of smem triggering a channel scan | |
111 | * @work: work item for edge house keeping | |
112 | */ | |
113 | struct qcom_smd_edge { | |
114 | struct qcom_smd *smd; | |
115 | struct device_node *of_node; | |
116 | unsigned edge_id; | |
93dbed91 | 117 | unsigned remote_pid; |
f2ab3298 BA |
118 | |
119 | int irq; | |
120 | ||
121 | struct regmap *ipc_regmap; | |
122 | int ipc_offset; | |
123 | int ipc_bit; | |
124 | ||
125 | struct list_head channels; | |
126 | spinlock_t channels_lock; | |
127 | ||
128 | DECLARE_BITMAP(allocated[SMD_ALLOC_TBL_COUNT], SMD_ALLOC_TBL_SIZE); | |
129 | ||
130 | bool need_rescan; | |
131 | unsigned smem_available; | |
132 | ||
133 | struct work_struct work; | |
134 | }; | |
135 | ||
136 | /* | |
137 | * SMD channel states. | |
138 | */ | |
139 | enum smd_channel_state { | |
140 | SMD_CHANNEL_CLOSED, | |
141 | SMD_CHANNEL_OPENING, | |
142 | SMD_CHANNEL_OPENED, | |
143 | SMD_CHANNEL_FLUSHING, | |
144 | SMD_CHANNEL_CLOSING, | |
145 | SMD_CHANNEL_RESET, | |
146 | SMD_CHANNEL_RESET_OPENING | |
147 | }; | |
148 | ||
149 | /** | |
150 | * struct qcom_smd_channel - smd channel struct | |
151 | * @edge: qcom_smd_edge this channel is living on | |
152 | * @qsdev: reference to a associated smd client device | |
153 | * @name: name of the channel | |
154 | * @state: local state of the channel | |
155 | * @remote_state: remote state of the channel | |
f02dc825 SB |
156 | * @info: byte aligned outgoing/incoming channel info |
157 | * @info_word: word aligned outgoing/incoming channel info | |
f2ab3298 BA |
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 | ||
f02dc825 SB |
178 | struct smd_channel_info_pair *info; |
179 | struct smd_channel_info_word_pair *info_word; | |
f2ab3298 BA |
180 | |
181 | struct mutex tx_lock; | |
182 | wait_queue_head_t fblockread_event; | |
183 | ||
184 | void *tx_fifo; | |
185 | void *rx_fifo; | |
186 | int fifo_size; | |
187 | ||
188 | void *bounce_buffer; | |
189 | int (*cb)(struct qcom_smd_device *, const void *, size_t); | |
190 | ||
191 | spinlock_t recv_lock; | |
192 | ||
193 | int pkt_size; | |
194 | ||
195 | struct list_head list; | |
196 | }; | |
197 | ||
198 | /** | |
199 | * struct qcom_smd - smd struct | |
200 | * @dev: device struct | |
201 | * @num_edges: number of entries in @edges | |
202 | * @edges: array of edges to be handled | |
203 | */ | |
204 | struct qcom_smd { | |
205 | struct device *dev; | |
206 | ||
207 | unsigned num_edges; | |
208 | struct qcom_smd_edge edges[0]; | |
209 | }; | |
210 | ||
211 | /* | |
212 | * Format of the smd_info smem items, for byte aligned channels. | |
213 | */ | |
214 | struct smd_channel_info { | |
215 | u32 state; | |
216 | u8 fDSR; | |
217 | u8 fCTS; | |
218 | u8 fCD; | |
219 | u8 fRI; | |
220 | u8 fHEAD; | |
221 | u8 fTAIL; | |
222 | u8 fSTATE; | |
223 | u8 fBLOCKREADINTR; | |
224 | u32 tail; | |
225 | u32 head; | |
226 | }; | |
227 | ||
f02dc825 SB |
228 | struct smd_channel_info_pair { |
229 | struct smd_channel_info tx; | |
230 | struct smd_channel_info rx; | |
231 | }; | |
232 | ||
f2ab3298 BA |
233 | /* |
234 | * Format of the smd_info smem items, for word aligned channels. | |
235 | */ | |
236 | struct smd_channel_info_word { | |
237 | u32 state; | |
238 | u32 fDSR; | |
239 | u32 fCTS; | |
240 | u32 fCD; | |
241 | u32 fRI; | |
242 | u32 fHEAD; | |
243 | u32 fTAIL; | |
244 | u32 fSTATE; | |
245 | u32 fBLOCKREADINTR; | |
246 | u32 tail; | |
247 | u32 head; | |
248 | }; | |
249 | ||
f02dc825 SB |
250 | struct smd_channel_info_word_pair { |
251 | struct smd_channel_info_word tx; | |
252 | struct smd_channel_info_word rx; | |
253 | }; | |
254 | ||
f2ab3298 | 255 | #define GET_RX_CHANNEL_INFO(channel, param) \ |
f02dc825 SB |
256 | (channel->info_word ? \ |
257 | channel->info_word->rx.param : \ | |
258 | channel->info->rx.param) | |
f2ab3298 BA |
259 | |
260 | #define SET_RX_CHANNEL_INFO(channel, param, value) \ | |
f02dc825 SB |
261 | (channel->info_word ? \ |
262 | (channel->info_word->rx.param = value) : \ | |
263 | (channel->info->rx.param = value)) | |
f2ab3298 BA |
264 | |
265 | #define GET_TX_CHANNEL_INFO(channel, param) \ | |
f02dc825 SB |
266 | (channel->info_word ? \ |
267 | channel->info_word->tx.param : \ | |
268 | channel->info->tx.param) | |
f2ab3298 BA |
269 | |
270 | #define SET_TX_CHANNEL_INFO(channel, param, value) \ | |
f02dc825 SB |
271 | (channel->info_word ? \ |
272 | (channel->info_word->tx.param = value) : \ | |
273 | (channel->info->tx.param = value)) | |
f2ab3298 BA |
274 | |
275 | /** | |
276 | * struct qcom_smd_alloc_entry - channel allocation entry | |
277 | * @name: channel name | |
278 | * @cid: channel index | |
279 | * @flags: channel flags and edge id | |
280 | * @ref_count: reference count of the channel | |
281 | */ | |
282 | struct qcom_smd_alloc_entry { | |
283 | u8 name[20]; | |
284 | u32 cid; | |
285 | u32 flags; | |
286 | u32 ref_count; | |
287 | } __packed; | |
288 | ||
289 | #define SMD_CHANNEL_FLAGS_EDGE_MASK 0xff | |
290 | #define SMD_CHANNEL_FLAGS_STREAM BIT(8) | |
291 | #define SMD_CHANNEL_FLAGS_PACKET BIT(9) | |
292 | ||
293 | /* | |
294 | * Each smd packet contains a 20 byte header, with the first 4 being the length | |
295 | * of the packet. | |
296 | */ | |
297 | #define SMD_PACKET_HEADER_LEN 20 | |
298 | ||
299 | /* | |
300 | * Signal the remote processor associated with 'channel'. | |
301 | */ | |
302 | static void qcom_smd_signal_channel(struct qcom_smd_channel *channel) | |
303 | { | |
304 | struct qcom_smd_edge *edge = channel->edge; | |
305 | ||
306 | regmap_write(edge->ipc_regmap, edge->ipc_offset, BIT(edge->ipc_bit)); | |
307 | } | |
308 | ||
309 | /* | |
310 | * Initialize the tx channel info | |
311 | */ | |
312 | static void qcom_smd_channel_reset(struct qcom_smd_channel *channel) | |
313 | { | |
314 | SET_TX_CHANNEL_INFO(channel, state, SMD_CHANNEL_CLOSED); | |
315 | SET_TX_CHANNEL_INFO(channel, fDSR, 0); | |
316 | SET_TX_CHANNEL_INFO(channel, fCTS, 0); | |
317 | SET_TX_CHANNEL_INFO(channel, fCD, 0); | |
318 | SET_TX_CHANNEL_INFO(channel, fRI, 0); | |
319 | SET_TX_CHANNEL_INFO(channel, fHEAD, 0); | |
320 | SET_TX_CHANNEL_INFO(channel, fTAIL, 0); | |
321 | SET_TX_CHANNEL_INFO(channel, fSTATE, 1); | |
208487a8 | 322 | SET_TX_CHANNEL_INFO(channel, fBLOCKREADINTR, 1); |
f2ab3298 BA |
323 | SET_TX_CHANNEL_INFO(channel, head, 0); |
324 | SET_TX_CHANNEL_INFO(channel, tail, 0); | |
325 | ||
326 | qcom_smd_signal_channel(channel); | |
327 | ||
328 | channel->state = SMD_CHANNEL_CLOSED; | |
329 | channel->pkt_size = 0; | |
330 | } | |
331 | ||
332 | /* | |
333 | * Calculate the amount of data available in the rx fifo | |
334 | */ | |
335 | static size_t qcom_smd_channel_get_rx_avail(struct qcom_smd_channel *channel) | |
336 | { | |
337 | unsigned head; | |
338 | unsigned tail; | |
339 | ||
340 | head = GET_RX_CHANNEL_INFO(channel, head); | |
341 | tail = GET_RX_CHANNEL_INFO(channel, tail); | |
342 | ||
343 | return (head - tail) & (channel->fifo_size - 1); | |
344 | } | |
345 | ||
346 | /* | |
347 | * Set tx channel state and inform the remote processor | |
348 | */ | |
349 | static void qcom_smd_channel_set_state(struct qcom_smd_channel *channel, | |
350 | int state) | |
351 | { | |
352 | struct qcom_smd_edge *edge = channel->edge; | |
353 | bool is_open = state == SMD_CHANNEL_OPENED; | |
354 | ||
355 | if (channel->state == state) | |
356 | return; | |
357 | ||
358 | dev_dbg(edge->smd->dev, "set_state(%s, %d)\n", channel->name, state); | |
359 | ||
360 | SET_TX_CHANNEL_INFO(channel, fDSR, is_open); | |
361 | SET_TX_CHANNEL_INFO(channel, fCTS, is_open); | |
362 | SET_TX_CHANNEL_INFO(channel, fCD, is_open); | |
363 | ||
364 | SET_TX_CHANNEL_INFO(channel, state, state); | |
365 | SET_TX_CHANNEL_INFO(channel, fSTATE, 1); | |
366 | ||
367 | channel->state = state; | |
368 | qcom_smd_signal_channel(channel); | |
369 | } | |
370 | ||
371 | /* | |
372 | * Copy count bytes of data using 32bit accesses, if that's required. | |
373 | */ | |
3b781e55 SB |
374 | static void smd_copy_to_fifo(void __iomem *dst, |
375 | const void *src, | |
f2ab3298 BA |
376 | size_t count, |
377 | bool word_aligned) | |
378 | { | |
f2ab3298 | 379 | if (word_aligned) { |
3b781e55 | 380 | __iowrite32_copy(dst, src, count / sizeof(u32)); |
f2ab3298 | 381 | } else { |
3b781e55 | 382 | memcpy_toio(dst, src, count); |
f2ab3298 BA |
383 | } |
384 | } | |
385 | ||
386 | /* | |
387 | * Copy count bytes of data using 32bit accesses, if that is required. | |
388 | */ | |
389 | static void smd_copy_from_fifo(void *_dst, | |
390 | const void __iomem *_src, | |
391 | size_t count, | |
392 | bool word_aligned) | |
393 | { | |
394 | u32 *dst = (u32 *)_dst; | |
395 | u32 *src = (u32 *)_src; | |
396 | ||
397 | if (word_aligned) { | |
398 | count /= sizeof(u32); | |
399 | while (count--) | |
400 | *dst++ = readl_relaxed(src++); | |
401 | } else { | |
402 | memcpy_fromio(_dst, _src, count); | |
403 | } | |
404 | } | |
405 | ||
406 | /* | |
407 | * Read count bytes of data from the rx fifo into buf, but don't advance the | |
408 | * tail. | |
409 | */ | |
410 | static size_t qcom_smd_channel_peek(struct qcom_smd_channel *channel, | |
411 | void *buf, size_t count) | |
412 | { | |
413 | bool word_aligned; | |
414 | unsigned tail; | |
415 | size_t len; | |
416 | ||
f02dc825 | 417 | word_aligned = channel->info_word; |
f2ab3298 BA |
418 | tail = GET_RX_CHANNEL_INFO(channel, tail); |
419 | ||
420 | len = min_t(size_t, count, channel->fifo_size - tail); | |
421 | if (len) { | |
422 | smd_copy_from_fifo(buf, | |
423 | channel->rx_fifo + tail, | |
424 | len, | |
425 | word_aligned); | |
426 | } | |
427 | ||
428 | if (len != count) { | |
429 | smd_copy_from_fifo(buf + len, | |
430 | channel->rx_fifo, | |
431 | count - len, | |
432 | word_aligned); | |
433 | } | |
434 | ||
435 | return count; | |
436 | } | |
437 | ||
438 | /* | |
439 | * Advance the rx tail by count bytes. | |
440 | */ | |
441 | static void qcom_smd_channel_advance(struct qcom_smd_channel *channel, | |
442 | size_t count) | |
443 | { | |
444 | unsigned tail; | |
445 | ||
446 | tail = GET_RX_CHANNEL_INFO(channel, tail); | |
447 | tail += count; | |
448 | tail &= (channel->fifo_size - 1); | |
449 | SET_RX_CHANNEL_INFO(channel, tail, tail); | |
450 | } | |
451 | ||
452 | /* | |
453 | * Read out a single packet from the rx fifo and deliver it to the device | |
454 | */ | |
455 | static int qcom_smd_channel_recv_single(struct qcom_smd_channel *channel) | |
456 | { | |
457 | struct qcom_smd_device *qsdev = channel->qsdev; | |
458 | unsigned tail; | |
459 | size_t len; | |
460 | void *ptr; | |
461 | int ret; | |
462 | ||
463 | if (!channel->cb) | |
464 | return 0; | |
465 | ||
466 | tail = GET_RX_CHANNEL_INFO(channel, tail); | |
467 | ||
468 | /* Use bounce buffer if the data wraps */ | |
469 | if (tail + channel->pkt_size >= channel->fifo_size) { | |
470 | ptr = channel->bounce_buffer; | |
471 | len = qcom_smd_channel_peek(channel, ptr, channel->pkt_size); | |
472 | } else { | |
473 | ptr = channel->rx_fifo + tail; | |
474 | len = channel->pkt_size; | |
475 | } | |
476 | ||
477 | ret = channel->cb(qsdev, ptr, len); | |
478 | if (ret < 0) | |
479 | return ret; | |
480 | ||
481 | /* Only forward the tail if the client consumed the data */ | |
482 | qcom_smd_channel_advance(channel, len); | |
483 | ||
484 | channel->pkt_size = 0; | |
485 | ||
486 | return 0; | |
487 | } | |
488 | ||
489 | /* | |
490 | * Per channel interrupt handling | |
491 | */ | |
492 | static bool qcom_smd_channel_intr(struct qcom_smd_channel *channel) | |
493 | { | |
494 | bool need_state_scan = false; | |
495 | int remote_state; | |
496 | u32 pktlen; | |
497 | int avail; | |
498 | int ret; | |
499 | ||
500 | /* Handle state changes */ | |
501 | remote_state = GET_RX_CHANNEL_INFO(channel, state); | |
502 | if (remote_state != channel->remote_state) { | |
503 | channel->remote_state = remote_state; | |
504 | need_state_scan = true; | |
505 | } | |
506 | /* Indicate that we have seen any state change */ | |
507 | SET_RX_CHANNEL_INFO(channel, fSTATE, 0); | |
508 | ||
509 | /* Signal waiting qcom_smd_send() about the interrupt */ | |
510 | if (!GET_TX_CHANNEL_INFO(channel, fBLOCKREADINTR)) | |
511 | wake_up_interruptible(&channel->fblockread_event); | |
512 | ||
513 | /* Don't consume any data until we've opened the channel */ | |
514 | if (channel->state != SMD_CHANNEL_OPENED) | |
515 | goto out; | |
516 | ||
517 | /* Indicate that we've seen the new data */ | |
518 | SET_RX_CHANNEL_INFO(channel, fHEAD, 0); | |
519 | ||
520 | /* Consume data */ | |
521 | for (;;) { | |
522 | avail = qcom_smd_channel_get_rx_avail(channel); | |
523 | ||
524 | if (!channel->pkt_size && avail >= SMD_PACKET_HEADER_LEN) { | |
525 | qcom_smd_channel_peek(channel, &pktlen, sizeof(pktlen)); | |
526 | qcom_smd_channel_advance(channel, SMD_PACKET_HEADER_LEN); | |
527 | channel->pkt_size = pktlen; | |
528 | } else if (channel->pkt_size && avail >= channel->pkt_size) { | |
529 | ret = qcom_smd_channel_recv_single(channel); | |
530 | if (ret) | |
531 | break; | |
532 | } else { | |
533 | break; | |
534 | } | |
535 | } | |
536 | ||
537 | /* Indicate that we have seen and updated tail */ | |
538 | SET_RX_CHANNEL_INFO(channel, fTAIL, 1); | |
539 | ||
540 | /* Signal the remote that we've consumed the data (if requested) */ | |
541 | if (!GET_RX_CHANNEL_INFO(channel, fBLOCKREADINTR)) { | |
542 | /* Ensure ordering of channel info updates */ | |
543 | wmb(); | |
544 | ||
545 | qcom_smd_signal_channel(channel); | |
546 | } | |
547 | ||
548 | out: | |
549 | return need_state_scan; | |
550 | } | |
551 | ||
552 | /* | |
553 | * The edge interrupts are triggered by the remote processor on state changes, | |
554 | * channel info updates or when new channels are created. | |
555 | */ | |
556 | static irqreturn_t qcom_smd_edge_intr(int irq, void *data) | |
557 | { | |
558 | struct qcom_smd_edge *edge = data; | |
559 | struct qcom_smd_channel *channel; | |
560 | unsigned available; | |
561 | bool kick_worker = false; | |
562 | ||
563 | /* | |
564 | * Handle state changes or data on each of the channels on this edge | |
565 | */ | |
566 | spin_lock(&edge->channels_lock); | |
567 | list_for_each_entry(channel, &edge->channels, list) { | |
568 | spin_lock(&channel->recv_lock); | |
569 | kick_worker |= qcom_smd_channel_intr(channel); | |
570 | spin_unlock(&channel->recv_lock); | |
571 | } | |
572 | spin_unlock(&edge->channels_lock); | |
573 | ||
574 | /* | |
575 | * Creating a new channel requires allocating an smem entry, so we only | |
576 | * have to scan if the amount of available space in smem have changed | |
577 | * since last scan. | |
578 | */ | |
93dbed91 | 579 | available = qcom_smem_get_free_space(edge->remote_pid); |
f2ab3298 BA |
580 | if (available != edge->smem_available) { |
581 | edge->smem_available = available; | |
582 | edge->need_rescan = true; | |
583 | kick_worker = true; | |
584 | } | |
585 | ||
586 | if (kick_worker) | |
587 | schedule_work(&edge->work); | |
588 | ||
589 | return IRQ_HANDLED; | |
590 | } | |
591 | ||
592 | /* | |
593 | * Delivers any outstanding packets in the rx fifo, can be used after probe of | |
594 | * the clients to deliver any packets that wasn't delivered before the client | |
595 | * was setup. | |
596 | */ | |
597 | static void qcom_smd_channel_resume(struct qcom_smd_channel *channel) | |
598 | { | |
599 | unsigned long flags; | |
600 | ||
601 | spin_lock_irqsave(&channel->recv_lock, flags); | |
602 | qcom_smd_channel_intr(channel); | |
603 | spin_unlock_irqrestore(&channel->recv_lock, flags); | |
604 | } | |
605 | ||
606 | /* | |
607 | * Calculate how much space is available in the tx fifo. | |
608 | */ | |
609 | static size_t qcom_smd_get_tx_avail(struct qcom_smd_channel *channel) | |
610 | { | |
611 | unsigned head; | |
612 | unsigned tail; | |
613 | unsigned mask = channel->fifo_size - 1; | |
614 | ||
615 | head = GET_TX_CHANNEL_INFO(channel, head); | |
616 | tail = GET_TX_CHANNEL_INFO(channel, tail); | |
617 | ||
618 | return mask - ((head - tail) & mask); | |
619 | } | |
620 | ||
621 | /* | |
622 | * Write count bytes of data into channel, possibly wrapping in the ring buffer | |
623 | */ | |
624 | static int qcom_smd_write_fifo(struct qcom_smd_channel *channel, | |
625 | const void *data, | |
626 | size_t count) | |
627 | { | |
628 | bool word_aligned; | |
629 | unsigned head; | |
630 | size_t len; | |
631 | ||
f02dc825 | 632 | word_aligned = channel->info_word; |
f2ab3298 BA |
633 | head = GET_TX_CHANNEL_INFO(channel, head); |
634 | ||
635 | len = min_t(size_t, count, channel->fifo_size - head); | |
636 | if (len) { | |
637 | smd_copy_to_fifo(channel->tx_fifo + head, | |
638 | data, | |
639 | len, | |
640 | word_aligned); | |
641 | } | |
642 | ||
643 | if (len != count) { | |
644 | smd_copy_to_fifo(channel->tx_fifo, | |
645 | data + len, | |
646 | count - len, | |
647 | word_aligned); | |
648 | } | |
649 | ||
650 | head += count; | |
651 | head &= (channel->fifo_size - 1); | |
652 | SET_TX_CHANNEL_INFO(channel, head, head); | |
653 | ||
654 | return count; | |
655 | } | |
656 | ||
657 | /** | |
658 | * qcom_smd_send - write data to smd channel | |
659 | * @channel: channel handle | |
660 | * @data: buffer of data to write | |
661 | * @len: number of bytes to write | |
662 | * | |
663 | * This is a blocking write of len bytes into the channel's tx ring buffer and | |
664 | * signal the remote end. It will sleep until there is enough space available | |
665 | * in the tx buffer, utilizing the fBLOCKREADINTR signaling mechanism to avoid | |
666 | * polling. | |
667 | */ | |
668 | int qcom_smd_send(struct qcom_smd_channel *channel, const void *data, int len) | |
669 | { | |
670 | u32 hdr[5] = {len,}; | |
671 | int tlen = sizeof(hdr) + len; | |
672 | int ret; | |
673 | ||
674 | /* Word aligned channels only accept word size aligned data */ | |
f02dc825 | 675 | if (channel->info_word && len % 4) |
f2ab3298 BA |
676 | return -EINVAL; |
677 | ||
678 | ret = mutex_lock_interruptible(&channel->tx_lock); | |
679 | if (ret) | |
680 | return ret; | |
681 | ||
682 | while (qcom_smd_get_tx_avail(channel) < tlen) { | |
683 | if (channel->state != SMD_CHANNEL_OPENED) { | |
684 | ret = -EPIPE; | |
685 | goto out; | |
686 | } | |
687 | ||
208487a8 | 688 | SET_TX_CHANNEL_INFO(channel, fBLOCKREADINTR, 0); |
f2ab3298 BA |
689 | |
690 | ret = wait_event_interruptible(channel->fblockread_event, | |
691 | qcom_smd_get_tx_avail(channel) >= tlen || | |
692 | channel->state != SMD_CHANNEL_OPENED); | |
693 | if (ret) | |
694 | goto out; | |
695 | ||
208487a8 | 696 | SET_TX_CHANNEL_INFO(channel, fBLOCKREADINTR, 1); |
f2ab3298 BA |
697 | } |
698 | ||
699 | SET_TX_CHANNEL_INFO(channel, fTAIL, 0); | |
700 | ||
701 | qcom_smd_write_fifo(channel, hdr, sizeof(hdr)); | |
702 | qcom_smd_write_fifo(channel, data, len); | |
703 | ||
704 | SET_TX_CHANNEL_INFO(channel, fHEAD, 1); | |
705 | ||
706 | /* Ensure ordering of channel info updates */ | |
707 | wmb(); | |
708 | ||
709 | qcom_smd_signal_channel(channel); | |
710 | ||
711 | out: | |
712 | mutex_unlock(&channel->tx_lock); | |
713 | ||
714 | return ret; | |
715 | } | |
716 | EXPORT_SYMBOL(qcom_smd_send); | |
717 | ||
718 | static struct qcom_smd_device *to_smd_device(struct device *dev) | |
719 | { | |
720 | return container_of(dev, struct qcom_smd_device, dev); | |
721 | } | |
722 | ||
723 | static struct qcom_smd_driver *to_smd_driver(struct device *dev) | |
724 | { | |
725 | struct qcom_smd_device *qsdev = to_smd_device(dev); | |
726 | ||
727 | return container_of(qsdev->dev.driver, struct qcom_smd_driver, driver); | |
728 | } | |
729 | ||
730 | static int qcom_smd_dev_match(struct device *dev, struct device_driver *drv) | |
731 | { | |
1a7caca2 BA |
732 | struct qcom_smd_device *qsdev = to_smd_device(dev); |
733 | struct qcom_smd_driver *qsdrv = container_of(drv, struct qcom_smd_driver, driver); | |
734 | const struct qcom_smd_id *match = qsdrv->smd_match_table; | |
735 | const char *name = qsdev->channel->name; | |
736 | ||
737 | if (match) { | |
738 | while (match->name[0]) { | |
739 | if (!strcmp(match->name, name)) | |
740 | return 1; | |
741 | match++; | |
742 | } | |
743 | } | |
744 | ||
f2ab3298 BA |
745 | return of_driver_match_device(dev, drv); |
746 | } | |
747 | ||
748 | /* | |
749 | * Probe the smd client. | |
750 | * | |
751 | * The remote side have indicated that it want the channel to be opened, so | |
752 | * complete the state handshake and probe our client driver. | |
753 | */ | |
754 | static int qcom_smd_dev_probe(struct device *dev) | |
755 | { | |
756 | struct qcom_smd_device *qsdev = to_smd_device(dev); | |
757 | struct qcom_smd_driver *qsdrv = to_smd_driver(dev); | |
758 | struct qcom_smd_channel *channel = qsdev->channel; | |
759 | size_t bb_size; | |
760 | int ret; | |
761 | ||
762 | /* | |
763 | * Packets are maximum 4k, but reduce if the fifo is smaller | |
764 | */ | |
765 | bb_size = min(channel->fifo_size, SZ_4K); | |
766 | channel->bounce_buffer = kmalloc(bb_size, GFP_KERNEL); | |
767 | if (!channel->bounce_buffer) | |
768 | return -ENOMEM; | |
769 | ||
770 | channel->cb = qsdrv->callback; | |
771 | ||
772 | qcom_smd_channel_set_state(channel, SMD_CHANNEL_OPENING); | |
773 | ||
774 | qcom_smd_channel_set_state(channel, SMD_CHANNEL_OPENED); | |
775 | ||
776 | ret = qsdrv->probe(qsdev); | |
777 | if (ret) | |
778 | goto err; | |
779 | ||
780 | qcom_smd_channel_resume(channel); | |
781 | ||
782 | return 0; | |
783 | ||
784 | err: | |
785 | dev_err(&qsdev->dev, "probe failed\n"); | |
786 | ||
787 | channel->cb = NULL; | |
788 | kfree(channel->bounce_buffer); | |
789 | channel->bounce_buffer = NULL; | |
790 | ||
791 | qcom_smd_channel_set_state(channel, SMD_CHANNEL_CLOSED); | |
792 | return ret; | |
793 | } | |
794 | ||
795 | /* | |
796 | * Remove the smd client. | |
797 | * | |
798 | * The channel is going away, for some reason, so remove the smd client and | |
799 | * reset the channel state. | |
800 | */ | |
801 | static int qcom_smd_dev_remove(struct device *dev) | |
802 | { | |
803 | struct qcom_smd_device *qsdev = to_smd_device(dev); | |
804 | struct qcom_smd_driver *qsdrv = to_smd_driver(dev); | |
805 | struct qcom_smd_channel *channel = qsdev->channel; | |
806 | unsigned long flags; | |
807 | ||
808 | qcom_smd_channel_set_state(channel, SMD_CHANNEL_CLOSING); | |
809 | ||
810 | /* | |
811 | * Make sure we don't race with the code receiving data. | |
812 | */ | |
813 | spin_lock_irqsave(&channel->recv_lock, flags); | |
814 | channel->cb = NULL; | |
815 | spin_unlock_irqrestore(&channel->recv_lock, flags); | |
816 | ||
817 | /* Wake up any sleepers in qcom_smd_send() */ | |
818 | wake_up_interruptible(&channel->fblockread_event); | |
819 | ||
820 | /* | |
821 | * We expect that the client might block in remove() waiting for any | |
822 | * outstanding calls to qcom_smd_send() to wake up and finish. | |
823 | */ | |
824 | if (qsdrv->remove) | |
825 | qsdrv->remove(qsdev); | |
826 | ||
827 | /* | |
828 | * The client is now gone, cleanup and reset the channel state. | |
829 | */ | |
830 | channel->qsdev = NULL; | |
831 | kfree(channel->bounce_buffer); | |
832 | channel->bounce_buffer = NULL; | |
833 | ||
834 | qcom_smd_channel_set_state(channel, SMD_CHANNEL_CLOSED); | |
835 | ||
836 | qcom_smd_channel_reset(channel); | |
837 | ||
838 | return 0; | |
839 | } | |
840 | ||
841 | static struct bus_type qcom_smd_bus = { | |
842 | .name = "qcom_smd", | |
843 | .match = qcom_smd_dev_match, | |
844 | .probe = qcom_smd_dev_probe, | |
845 | .remove = qcom_smd_dev_remove, | |
846 | }; | |
847 | ||
848 | /* | |
849 | * Release function for the qcom_smd_device object. | |
850 | */ | |
851 | static void qcom_smd_release_device(struct device *dev) | |
852 | { | |
853 | struct qcom_smd_device *qsdev = to_smd_device(dev); | |
854 | ||
855 | kfree(qsdev); | |
856 | } | |
857 | ||
858 | /* | |
859 | * Finds the device_node for the smd child interested in this channel. | |
860 | */ | |
861 | static struct device_node *qcom_smd_match_channel(struct device_node *edge_node, | |
862 | const char *channel) | |
863 | { | |
864 | struct device_node *child; | |
865 | const char *name; | |
866 | const char *key; | |
867 | int ret; | |
868 | ||
869 | for_each_available_child_of_node(edge_node, child) { | |
870 | key = "qcom,smd-channels"; | |
871 | ret = of_property_read_string(child, key, &name); | |
872 | if (ret) { | |
873 | of_node_put(child); | |
874 | continue; | |
875 | } | |
876 | ||
877 | if (strcmp(name, channel) == 0) | |
878 | return child; | |
879 | } | |
880 | ||
881 | return NULL; | |
882 | } | |
883 | ||
884 | /* | |
885 | * Create a smd client device for channel that is being opened. | |
886 | */ | |
887 | static int qcom_smd_create_device(struct qcom_smd_channel *channel) | |
888 | { | |
889 | struct qcom_smd_device *qsdev; | |
890 | struct qcom_smd_edge *edge = channel->edge; | |
891 | struct device_node *node; | |
892 | struct qcom_smd *smd = edge->smd; | |
893 | int ret; | |
894 | ||
895 | if (channel->qsdev) | |
896 | return -EEXIST; | |
897 | ||
f2ab3298 BA |
898 | dev_dbg(smd->dev, "registering '%s'\n", channel->name); |
899 | ||
900 | qsdev = kzalloc(sizeof(*qsdev), GFP_KERNEL); | |
901 | if (!qsdev) | |
902 | return -ENOMEM; | |
903 | ||
1a7caca2 BA |
904 | node = qcom_smd_match_channel(edge->of_node, channel->name); |
905 | dev_set_name(&qsdev->dev, "%s.%s", | |
906 | edge->of_node->name, | |
907 | node ? node->name : channel->name); | |
908 | ||
f2ab3298 BA |
909 | qsdev->dev.parent = smd->dev; |
910 | qsdev->dev.bus = &qcom_smd_bus; | |
911 | qsdev->dev.release = qcom_smd_release_device; | |
912 | qsdev->dev.of_node = node; | |
913 | ||
914 | qsdev->channel = channel; | |
915 | ||
916 | channel->qsdev = qsdev; | |
917 | ||
918 | ret = device_register(&qsdev->dev); | |
919 | if (ret) { | |
920 | dev_err(smd->dev, "device_register failed: %d\n", ret); | |
921 | put_device(&qsdev->dev); | |
922 | } | |
923 | ||
924 | return ret; | |
925 | } | |
926 | ||
927 | /* | |
928 | * Destroy a smd client device for a channel that's going away. | |
929 | */ | |
930 | static void qcom_smd_destroy_device(struct qcom_smd_channel *channel) | |
931 | { | |
932 | struct device *dev; | |
933 | ||
934 | BUG_ON(!channel->qsdev); | |
935 | ||
936 | dev = &channel->qsdev->dev; | |
937 | ||
938 | device_unregister(dev); | |
939 | of_node_put(dev->of_node); | |
940 | put_device(dev); | |
941 | } | |
942 | ||
943 | /** | |
944 | * qcom_smd_driver_register - register a smd driver | |
945 | * @qsdrv: qcom_smd_driver struct | |
946 | */ | |
947 | int qcom_smd_driver_register(struct qcom_smd_driver *qsdrv) | |
948 | { | |
949 | qsdrv->driver.bus = &qcom_smd_bus; | |
950 | return driver_register(&qsdrv->driver); | |
951 | } | |
952 | EXPORT_SYMBOL(qcom_smd_driver_register); | |
953 | ||
954 | /** | |
955 | * qcom_smd_driver_unregister - unregister a smd driver | |
956 | * @qsdrv: qcom_smd_driver struct | |
957 | */ | |
958 | void qcom_smd_driver_unregister(struct qcom_smd_driver *qsdrv) | |
959 | { | |
960 | driver_unregister(&qsdrv->driver); | |
961 | } | |
962 | EXPORT_SYMBOL(qcom_smd_driver_unregister); | |
963 | ||
964 | /* | |
965 | * Allocate the qcom_smd_channel object for a newly found smd channel, | |
966 | * retrieving and validating the smem items involved. | |
967 | */ | |
968 | static struct qcom_smd_channel *qcom_smd_create_channel(struct qcom_smd_edge *edge, | |
969 | unsigned smem_info_item, | |
970 | unsigned smem_fifo_item, | |
971 | char *name) | |
972 | { | |
973 | struct qcom_smd_channel *channel; | |
974 | struct qcom_smd *smd = edge->smd; | |
975 | size_t fifo_size; | |
976 | size_t info_size; | |
977 | void *fifo_base; | |
978 | void *info; | |
979 | int ret; | |
980 | ||
981 | channel = devm_kzalloc(smd->dev, sizeof(*channel), GFP_KERNEL); | |
982 | if (!channel) | |
983 | return ERR_PTR(-ENOMEM); | |
984 | ||
985 | channel->edge = edge; | |
986 | channel->name = devm_kstrdup(smd->dev, name, GFP_KERNEL); | |
987 | if (!channel->name) | |
988 | return ERR_PTR(-ENOMEM); | |
989 | ||
990 | mutex_init(&channel->tx_lock); | |
991 | spin_lock_init(&channel->recv_lock); | |
992 | init_waitqueue_head(&channel->fblockread_event); | |
993 | ||
1a03964d SB |
994 | info = qcom_smem_get(edge->remote_pid, smem_info_item, &info_size); |
995 | if (IS_ERR(info)) { | |
996 | ret = PTR_ERR(info); | |
f2ab3298 | 997 | goto free_name_and_channel; |
1a03964d | 998 | } |
f2ab3298 BA |
999 | |
1000 | /* | |
1001 | * Use the size of the item to figure out which channel info struct to | |
1002 | * use. | |
1003 | */ | |
1004 | if (info_size == 2 * sizeof(struct smd_channel_info_word)) { | |
f02dc825 | 1005 | channel->info_word = info; |
f2ab3298 | 1006 | } else if (info_size == 2 * sizeof(struct smd_channel_info)) { |
f02dc825 | 1007 | channel->info = info; |
f2ab3298 BA |
1008 | } else { |
1009 | dev_err(smd->dev, | |
1010 | "channel info of size %zu not supported\n", info_size); | |
1011 | ret = -EINVAL; | |
1012 | goto free_name_and_channel; | |
1013 | } | |
1014 | ||
1a03964d SB |
1015 | fifo_base = qcom_smem_get(edge->remote_pid, smem_fifo_item, &fifo_size); |
1016 | if (IS_ERR(fifo_base)) { | |
1017 | ret = PTR_ERR(fifo_base); | |
f2ab3298 | 1018 | goto free_name_and_channel; |
1a03964d | 1019 | } |
f2ab3298 BA |
1020 | |
1021 | /* The channel consist of a rx and tx fifo of equal size */ | |
1022 | fifo_size /= 2; | |
1023 | ||
1024 | dev_dbg(smd->dev, "new channel '%s' info-size: %zu fifo-size: %zu\n", | |
1025 | name, info_size, fifo_size); | |
1026 | ||
1027 | channel->tx_fifo = fifo_base; | |
1028 | channel->rx_fifo = fifo_base + fifo_size; | |
1029 | channel->fifo_size = fifo_size; | |
1030 | ||
1031 | qcom_smd_channel_reset(channel); | |
1032 | ||
1033 | return channel; | |
1034 | ||
1035 | free_name_and_channel: | |
1036 | devm_kfree(smd->dev, channel->name); | |
1037 | devm_kfree(smd->dev, channel); | |
1038 | ||
1039 | return ERR_PTR(ret); | |
1040 | } | |
1041 | ||
1042 | /* | |
1043 | * Scans the allocation table for any newly allocated channels, calls | |
1044 | * qcom_smd_create_channel() to create representations of these and add | |
1045 | * them to the edge's list of channels. | |
1046 | */ | |
1047 | static void qcom_discover_channels(struct qcom_smd_edge *edge) | |
1048 | { | |
1049 | struct qcom_smd_alloc_entry *alloc_tbl; | |
1050 | struct qcom_smd_alloc_entry *entry; | |
1051 | struct qcom_smd_channel *channel; | |
1052 | struct qcom_smd *smd = edge->smd; | |
1053 | unsigned long flags; | |
1054 | unsigned fifo_id; | |
1055 | unsigned info_id; | |
f2ab3298 BA |
1056 | int tbl; |
1057 | int i; | |
1058 | ||
1059 | for (tbl = 0; tbl < SMD_ALLOC_TBL_COUNT; tbl++) { | |
1a03964d SB |
1060 | alloc_tbl = qcom_smem_get(edge->remote_pid, |
1061 | smem_items[tbl].alloc_tbl_id, NULL); | |
1062 | if (IS_ERR(alloc_tbl)) | |
f2ab3298 BA |
1063 | continue; |
1064 | ||
1065 | for (i = 0; i < SMD_ALLOC_TBL_SIZE; i++) { | |
1066 | entry = &alloc_tbl[i]; | |
1067 | if (test_bit(i, edge->allocated[tbl])) | |
1068 | continue; | |
1069 | ||
1070 | if (entry->ref_count == 0) | |
1071 | continue; | |
1072 | ||
1073 | if (!entry->name[0]) | |
1074 | continue; | |
1075 | ||
1076 | if (!(entry->flags & SMD_CHANNEL_FLAGS_PACKET)) | |
1077 | continue; | |
1078 | ||
1079 | if ((entry->flags & SMD_CHANNEL_FLAGS_EDGE_MASK) != edge->edge_id) | |
1080 | continue; | |
1081 | ||
1082 | info_id = smem_items[tbl].info_base_id + entry->cid; | |
1083 | fifo_id = smem_items[tbl].fifo_base_id + entry->cid; | |
1084 | ||
1085 | channel = qcom_smd_create_channel(edge, info_id, fifo_id, entry->name); | |
1086 | if (IS_ERR(channel)) | |
1087 | continue; | |
1088 | ||
1089 | spin_lock_irqsave(&edge->channels_lock, flags); | |
1090 | list_add(&channel->list, &edge->channels); | |
1091 | spin_unlock_irqrestore(&edge->channels_lock, flags); | |
1092 | ||
1093 | dev_dbg(smd->dev, "new channel found: '%s'\n", channel->name); | |
1094 | set_bit(i, edge->allocated[tbl]); | |
1095 | } | |
1096 | } | |
1097 | ||
1098 | schedule_work(&edge->work); | |
1099 | } | |
1100 | ||
1101 | /* | |
1102 | * This per edge worker scans smem for any new channels and register these. It | |
1103 | * then scans all registered channels for state changes that should be handled | |
1104 | * by creating or destroying smd client devices for the registered channels. | |
1105 | * | |
1106 | * LOCKING: edge->channels_lock is not needed to be held during the traversal | |
1107 | * of the channels list as it's done synchronously with the only writer. | |
1108 | */ | |
1109 | static void qcom_channel_state_worker(struct work_struct *work) | |
1110 | { | |
1111 | struct qcom_smd_channel *channel; | |
1112 | struct qcom_smd_edge *edge = container_of(work, | |
1113 | struct qcom_smd_edge, | |
1114 | work); | |
1115 | unsigned remote_state; | |
1116 | ||
1117 | /* | |
1118 | * Rescan smem if we have reason to belive that there are new channels. | |
1119 | */ | |
1120 | if (edge->need_rescan) { | |
1121 | edge->need_rescan = false; | |
1122 | qcom_discover_channels(edge); | |
1123 | } | |
1124 | ||
1125 | /* | |
1126 | * Register a device for any closed channel where the remote processor | |
1127 | * is showing interest in opening the channel. | |
1128 | */ | |
1129 | list_for_each_entry(channel, &edge->channels, list) { | |
1130 | if (channel->state != SMD_CHANNEL_CLOSED) | |
1131 | continue; | |
1132 | ||
1133 | remote_state = GET_RX_CHANNEL_INFO(channel, state); | |
1134 | if (remote_state != SMD_CHANNEL_OPENING && | |
1135 | remote_state != SMD_CHANNEL_OPENED) | |
1136 | continue; | |
1137 | ||
1138 | qcom_smd_create_device(channel); | |
1139 | } | |
1140 | ||
1141 | /* | |
1142 | * Unregister the device for any channel that is opened where the | |
1143 | * remote processor is closing the channel. | |
1144 | */ | |
1145 | list_for_each_entry(channel, &edge->channels, list) { | |
1146 | if (channel->state != SMD_CHANNEL_OPENING && | |
1147 | channel->state != SMD_CHANNEL_OPENED) | |
1148 | continue; | |
1149 | ||
1150 | remote_state = GET_RX_CHANNEL_INFO(channel, state); | |
1151 | if (remote_state == SMD_CHANNEL_OPENING || | |
1152 | remote_state == SMD_CHANNEL_OPENED) | |
1153 | continue; | |
1154 | ||
1155 | qcom_smd_destroy_device(channel); | |
1156 | } | |
1157 | } | |
1158 | ||
1159 | /* | |
1160 | * Parses an of_node describing an edge. | |
1161 | */ | |
1162 | static int qcom_smd_parse_edge(struct device *dev, | |
1163 | struct device_node *node, | |
1164 | struct qcom_smd_edge *edge) | |
1165 | { | |
1166 | struct device_node *syscon_np; | |
1167 | const char *key; | |
1168 | int irq; | |
1169 | int ret; | |
1170 | ||
1171 | INIT_LIST_HEAD(&edge->channels); | |
1172 | spin_lock_init(&edge->channels_lock); | |
1173 | ||
1174 | INIT_WORK(&edge->work, qcom_channel_state_worker); | |
1175 | ||
1176 | edge->of_node = of_node_get(node); | |
1177 | ||
1178 | irq = irq_of_parse_and_map(node, 0); | |
1179 | if (irq < 0) { | |
1180 | dev_err(dev, "required smd interrupt missing\n"); | |
1181 | return -EINVAL; | |
1182 | } | |
1183 | ||
1184 | ret = devm_request_irq(dev, irq, | |
1185 | qcom_smd_edge_intr, IRQF_TRIGGER_RISING, | |
1186 | node->name, edge); | |
1187 | if (ret) { | |
1188 | dev_err(dev, "failed to request smd irq\n"); | |
1189 | return ret; | |
1190 | } | |
1191 | ||
1192 | edge->irq = irq; | |
1193 | ||
1194 | key = "qcom,smd-edge"; | |
1195 | ret = of_property_read_u32(node, key, &edge->edge_id); | |
1196 | if (ret) { | |
1197 | dev_err(dev, "edge missing %s property\n", key); | |
1198 | return -EINVAL; | |
1199 | } | |
1200 | ||
93dbed91 AG |
1201 | edge->remote_pid = QCOM_SMEM_HOST_ANY; |
1202 | key = "qcom,remote-pid"; | |
1203 | of_property_read_u32(node, key, &edge->remote_pid); | |
1204 | ||
f2ab3298 BA |
1205 | syscon_np = of_parse_phandle(node, "qcom,ipc", 0); |
1206 | if (!syscon_np) { | |
1207 | dev_err(dev, "no qcom,ipc node\n"); | |
1208 | return -ENODEV; | |
1209 | } | |
1210 | ||
1211 | edge->ipc_regmap = syscon_node_to_regmap(syscon_np); | |
1212 | if (IS_ERR(edge->ipc_regmap)) | |
1213 | return PTR_ERR(edge->ipc_regmap); | |
1214 | ||
1215 | key = "qcom,ipc"; | |
1216 | ret = of_property_read_u32_index(node, key, 1, &edge->ipc_offset); | |
1217 | if (ret < 0) { | |
1218 | dev_err(dev, "no offset in %s\n", key); | |
1219 | return -EINVAL; | |
1220 | } | |
1221 | ||
1222 | ret = of_property_read_u32_index(node, key, 2, &edge->ipc_bit); | |
1223 | if (ret < 0) { | |
1224 | dev_err(dev, "no bit in %s\n", key); | |
1225 | return -EINVAL; | |
1226 | } | |
1227 | ||
1228 | return 0; | |
1229 | } | |
1230 | ||
1231 | static int qcom_smd_probe(struct platform_device *pdev) | |
1232 | { | |
1233 | struct qcom_smd_edge *edge; | |
1234 | struct device_node *node; | |
1235 | struct qcom_smd *smd; | |
1236 | size_t array_size; | |
1237 | int num_edges; | |
1238 | int ret; | |
1239 | int i = 0; | |
1a03964d | 1240 | void *p; |
f2ab3298 BA |
1241 | |
1242 | /* Wait for smem */ | |
1a03964d SB |
1243 | p = qcom_smem_get(QCOM_SMEM_HOST_ANY, smem_items[0].alloc_tbl_id, NULL); |
1244 | if (PTR_ERR(p) == -EPROBE_DEFER) | |
1245 | return PTR_ERR(p); | |
f2ab3298 BA |
1246 | |
1247 | num_edges = of_get_available_child_count(pdev->dev.of_node); | |
1248 | array_size = sizeof(*smd) + num_edges * sizeof(struct qcom_smd_edge); | |
1249 | smd = devm_kzalloc(&pdev->dev, array_size, GFP_KERNEL); | |
1250 | if (!smd) | |
1251 | return -ENOMEM; | |
1252 | smd->dev = &pdev->dev; | |
1253 | ||
1254 | smd->num_edges = num_edges; | |
1255 | for_each_available_child_of_node(pdev->dev.of_node, node) { | |
1256 | edge = &smd->edges[i++]; | |
1257 | edge->smd = smd; | |
1258 | ||
1259 | ret = qcom_smd_parse_edge(&pdev->dev, node, edge); | |
1260 | if (ret) | |
1261 | continue; | |
1262 | ||
1263 | edge->need_rescan = true; | |
1264 | schedule_work(&edge->work); | |
1265 | } | |
1266 | ||
1267 | platform_set_drvdata(pdev, smd); | |
1268 | ||
1269 | return 0; | |
1270 | } | |
1271 | ||
1272 | /* | |
1273 | * Shut down all smd clients by making sure that each edge stops processing | |
1274 | * events and scanning for new channels, then call destroy on the devices. | |
1275 | */ | |
1276 | static int qcom_smd_remove(struct platform_device *pdev) | |
1277 | { | |
1278 | struct qcom_smd_channel *channel; | |
1279 | struct qcom_smd_edge *edge; | |
1280 | struct qcom_smd *smd = platform_get_drvdata(pdev); | |
1281 | int i; | |
1282 | ||
1283 | for (i = 0; i < smd->num_edges; i++) { | |
1284 | edge = &smd->edges[i]; | |
1285 | ||
1286 | disable_irq(edge->irq); | |
1287 | cancel_work_sync(&edge->work); | |
1288 | ||
1289 | list_for_each_entry(channel, &edge->channels, list) { | |
1290 | if (!channel->qsdev) | |
1291 | continue; | |
1292 | ||
1293 | qcom_smd_destroy_device(channel); | |
1294 | } | |
1295 | } | |
1296 | ||
1297 | return 0; | |
1298 | } | |
1299 | ||
1300 | static const struct of_device_id qcom_smd_of_match[] = { | |
1301 | { .compatible = "qcom,smd" }, | |
1302 | {} | |
1303 | }; | |
1304 | MODULE_DEVICE_TABLE(of, qcom_smd_of_match); | |
1305 | ||
1306 | static struct platform_driver qcom_smd_driver = { | |
1307 | .probe = qcom_smd_probe, | |
1308 | .remove = qcom_smd_remove, | |
1309 | .driver = { | |
1310 | .name = "qcom-smd", | |
1311 | .of_match_table = qcom_smd_of_match, | |
1312 | }, | |
1313 | }; | |
1314 | ||
1315 | static int __init qcom_smd_init(void) | |
1316 | { | |
1317 | int ret; | |
1318 | ||
1319 | ret = bus_register(&qcom_smd_bus); | |
1320 | if (ret) { | |
1321 | pr_err("failed to register smd bus: %d\n", ret); | |
1322 | return ret; | |
1323 | } | |
1324 | ||
1325 | return platform_driver_register(&qcom_smd_driver); | |
1326 | } | |
1327 | postcore_initcall(qcom_smd_init); | |
1328 | ||
1329 | static void __exit qcom_smd_exit(void) | |
1330 | { | |
1331 | platform_driver_unregister(&qcom_smd_driver); | |
1332 | bus_unregister(&qcom_smd_bus); | |
1333 | } | |
1334 | module_exit(qcom_smd_exit); | |
1335 | ||
1336 | MODULE_AUTHOR("Bjorn Andersson <bjorn.andersson@sonymobile.com>"); | |
1337 | MODULE_DESCRIPTION("Qualcomm Shared Memory Driver"); | |
1338 | MODULE_LICENSE("GPL v2"); |