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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 | { | |
ea4683e0 BA |
90 | .alloc_tbl_id = 266, |
91 | .info_base_id = 138, | |
f2ab3298 BA |
92 | .fifo_base_id = 202, |
93 | }, | |
94 | }; | |
95 | ||
96 | /** | |
97 | * struct qcom_smd_edge - representing a remote processor | |
da057302 | 98 | * @dev: device for this edge |
f2ab3298 BA |
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 | |
f2ab3298 | 109 | * @smem_available: last available amount of smem triggering a channel scan |
995b170a BA |
110 | * @scan_work: work item for discovering new channels |
111 | * @state_work: work item for edge state changes | |
f2ab3298 BA |
112 | */ |
113 | struct qcom_smd_edge { | |
da057302 BA |
114 | struct device dev; |
115 | ||
f2ab3298 BA |
116 | struct device_node *of_node; |
117 | unsigned edge_id; | |
93dbed91 | 118 | unsigned remote_pid; |
f2ab3298 BA |
119 | |
120 | int irq; | |
121 | ||
122 | struct regmap *ipc_regmap; | |
123 | int ipc_offset; | |
124 | int ipc_bit; | |
125 | ||
126 | struct list_head channels; | |
127 | spinlock_t channels_lock; | |
128 | ||
129 | DECLARE_BITMAP(allocated[SMD_ALLOC_TBL_COUNT], SMD_ALLOC_TBL_SIZE); | |
130 | ||
f2ab3298 BA |
131 | unsigned smem_available; |
132 | ||
028021d2 BA |
133 | wait_queue_head_t new_channel_event; |
134 | ||
995b170a BA |
135 | struct work_struct scan_work; |
136 | struct work_struct state_work; | |
f2ab3298 BA |
137 | }; |
138 | ||
da057302 BA |
139 | #define to_smd_edge(d) container_of(d, struct qcom_smd_edge, dev) |
140 | ||
f2ab3298 BA |
141 | /* |
142 | * SMD channel states. | |
143 | */ | |
144 | enum smd_channel_state { | |
145 | SMD_CHANNEL_CLOSED, | |
146 | SMD_CHANNEL_OPENING, | |
147 | SMD_CHANNEL_OPENED, | |
148 | SMD_CHANNEL_FLUSHING, | |
149 | SMD_CHANNEL_CLOSING, | |
150 | SMD_CHANNEL_RESET, | |
151 | SMD_CHANNEL_RESET_OPENING | |
152 | }; | |
153 | ||
154 | /** | |
155 | * struct qcom_smd_channel - smd channel struct | |
156 | * @edge: qcom_smd_edge this channel is living on | |
157 | * @qsdev: reference to a associated smd client device | |
158 | * @name: name of the channel | |
159 | * @state: local state of the channel | |
160 | * @remote_state: remote state of the channel | |
f02dc825 SB |
161 | * @info: byte aligned outgoing/incoming channel info |
162 | * @info_word: word aligned outgoing/incoming channel info | |
f2ab3298 BA |
163 | * @tx_lock: lock to make writes to the channel mutually exclusive |
164 | * @fblockread_event: wakeup event tied to tx fBLOCKREADINTR | |
165 | * @tx_fifo: pointer to the outgoing ring buffer | |
166 | * @rx_fifo: pointer to the incoming ring buffer | |
167 | * @fifo_size: size of each ring buffer | |
168 | * @bounce_buffer: bounce buffer for reading wrapped packets | |
169 | * @cb: callback function registered for this channel | |
170 | * @recv_lock: guard for rx info modifications and cb pointer | |
171 | * @pkt_size: size of the currently handled packet | |
172 | * @list: lite entry for @channels in qcom_smd_edge | |
173 | */ | |
174 | struct qcom_smd_channel { | |
175 | struct qcom_smd_edge *edge; | |
176 | ||
177 | struct qcom_smd_device *qsdev; | |
178 | ||
179 | char *name; | |
180 | enum smd_channel_state state; | |
181 | enum smd_channel_state remote_state; | |
182 | ||
f02dc825 SB |
183 | struct smd_channel_info_pair *info; |
184 | struct smd_channel_info_word_pair *info_word; | |
f2ab3298 BA |
185 | |
186 | struct mutex tx_lock; | |
187 | wait_queue_head_t fblockread_event; | |
188 | ||
189 | void *tx_fifo; | |
190 | void *rx_fifo; | |
191 | int fifo_size; | |
192 | ||
193 | void *bounce_buffer; | |
39f0db29 | 194 | qcom_smd_cb_t cb; |
f2ab3298 BA |
195 | |
196 | spinlock_t recv_lock; | |
197 | ||
198 | int pkt_size; | |
199 | ||
b853cb96 BA |
200 | void *drvdata; |
201 | ||
f2ab3298 BA |
202 | struct list_head list; |
203 | }; | |
204 | ||
f2ab3298 BA |
205 | /* |
206 | * Format of the smd_info smem items, for byte aligned channels. | |
207 | */ | |
208 | struct smd_channel_info { | |
24f60e37 | 209 | __le32 state; |
f2ab3298 BA |
210 | u8 fDSR; |
211 | u8 fCTS; | |
212 | u8 fCD; | |
213 | u8 fRI; | |
214 | u8 fHEAD; | |
215 | u8 fTAIL; | |
216 | u8 fSTATE; | |
217 | u8 fBLOCKREADINTR; | |
24f60e37 SB |
218 | __le32 tail; |
219 | __le32 head; | |
f2ab3298 BA |
220 | }; |
221 | ||
f02dc825 SB |
222 | struct smd_channel_info_pair { |
223 | struct smd_channel_info tx; | |
224 | struct smd_channel_info rx; | |
225 | }; | |
226 | ||
f2ab3298 BA |
227 | /* |
228 | * Format of the smd_info smem items, for word aligned channels. | |
229 | */ | |
230 | struct smd_channel_info_word { | |
24f60e37 SB |
231 | __le32 state; |
232 | __le32 fDSR; | |
233 | __le32 fCTS; | |
234 | __le32 fCD; | |
235 | __le32 fRI; | |
236 | __le32 fHEAD; | |
237 | __le32 fTAIL; | |
238 | __le32 fSTATE; | |
239 | __le32 fBLOCKREADINTR; | |
240 | __le32 tail; | |
241 | __le32 head; | |
f2ab3298 BA |
242 | }; |
243 | ||
f02dc825 SB |
244 | struct smd_channel_info_word_pair { |
245 | struct smd_channel_info_word tx; | |
246 | struct smd_channel_info_word rx; | |
247 | }; | |
248 | ||
24f60e37 SB |
249 | #define GET_RX_CHANNEL_FLAG(channel, param) \ |
250 | ({ \ | |
251 | BUILD_BUG_ON(sizeof(channel->info->rx.param) != sizeof(u8)); \ | |
252 | channel->info_word ? \ | |
253 | le32_to_cpu(channel->info_word->rx.param) : \ | |
254 | channel->info->rx.param; \ | |
255 | }) | |
256 | ||
257 | #define GET_RX_CHANNEL_INFO(channel, param) \ | |
258 | ({ \ | |
259 | BUILD_BUG_ON(sizeof(channel->info->rx.param) != sizeof(u32)); \ | |
260 | le32_to_cpu(channel->info_word ? \ | |
261 | channel->info_word->rx.param : \ | |
262 | channel->info->rx.param); \ | |
263 | }) | |
264 | ||
265 | #define SET_RX_CHANNEL_FLAG(channel, param, value) \ | |
266 | ({ \ | |
267 | BUILD_BUG_ON(sizeof(channel->info->rx.param) != sizeof(u8)); \ | |
268 | if (channel->info_word) \ | |
269 | channel->info_word->rx.param = cpu_to_le32(value); \ | |
270 | else \ | |
271 | channel->info->rx.param = value; \ | |
272 | }) | |
273 | ||
274 | #define SET_RX_CHANNEL_INFO(channel, param, value) \ | |
275 | ({ \ | |
276 | BUILD_BUG_ON(sizeof(channel->info->rx.param) != sizeof(u32)); \ | |
277 | if (channel->info_word) \ | |
278 | channel->info_word->rx.param = cpu_to_le32(value); \ | |
279 | else \ | |
280 | channel->info->rx.param = cpu_to_le32(value); \ | |
281 | }) | |
282 | ||
283 | #define GET_TX_CHANNEL_FLAG(channel, param) \ | |
284 | ({ \ | |
285 | BUILD_BUG_ON(sizeof(channel->info->tx.param) != sizeof(u8)); \ | |
286 | channel->info_word ? \ | |
287 | le32_to_cpu(channel->info_word->tx.param) : \ | |
288 | channel->info->tx.param; \ | |
289 | }) | |
290 | ||
291 | #define GET_TX_CHANNEL_INFO(channel, param) \ | |
292 | ({ \ | |
293 | BUILD_BUG_ON(sizeof(channel->info->tx.param) != sizeof(u32)); \ | |
294 | le32_to_cpu(channel->info_word ? \ | |
295 | channel->info_word->tx.param : \ | |
296 | channel->info->tx.param); \ | |
297 | }) | |
298 | ||
299 | #define SET_TX_CHANNEL_FLAG(channel, param, value) \ | |
300 | ({ \ | |
301 | BUILD_BUG_ON(sizeof(channel->info->tx.param) != sizeof(u8)); \ | |
302 | if (channel->info_word) \ | |
303 | channel->info_word->tx.param = cpu_to_le32(value); \ | |
304 | else \ | |
305 | channel->info->tx.param = value; \ | |
306 | }) | |
307 | ||
308 | #define SET_TX_CHANNEL_INFO(channel, param, value) \ | |
309 | ({ \ | |
310 | BUILD_BUG_ON(sizeof(channel->info->tx.param) != sizeof(u32)); \ | |
311 | if (channel->info_word) \ | |
312 | channel->info_word->tx.param = cpu_to_le32(value); \ | |
313 | else \ | |
314 | channel->info->tx.param = cpu_to_le32(value); \ | |
315 | }) | |
f2ab3298 BA |
316 | |
317 | /** | |
318 | * struct qcom_smd_alloc_entry - channel allocation entry | |
319 | * @name: channel name | |
320 | * @cid: channel index | |
321 | * @flags: channel flags and edge id | |
322 | * @ref_count: reference count of the channel | |
323 | */ | |
324 | struct qcom_smd_alloc_entry { | |
325 | u8 name[20]; | |
24f60e37 SB |
326 | __le32 cid; |
327 | __le32 flags; | |
328 | __le32 ref_count; | |
f2ab3298 BA |
329 | } __packed; |
330 | ||
331 | #define SMD_CHANNEL_FLAGS_EDGE_MASK 0xff | |
332 | #define SMD_CHANNEL_FLAGS_STREAM BIT(8) | |
333 | #define SMD_CHANNEL_FLAGS_PACKET BIT(9) | |
334 | ||
335 | /* | |
336 | * Each smd packet contains a 20 byte header, with the first 4 being the length | |
337 | * of the packet. | |
338 | */ | |
339 | #define SMD_PACKET_HEADER_LEN 20 | |
340 | ||
341 | /* | |
342 | * Signal the remote processor associated with 'channel'. | |
343 | */ | |
344 | static void qcom_smd_signal_channel(struct qcom_smd_channel *channel) | |
345 | { | |
346 | struct qcom_smd_edge *edge = channel->edge; | |
347 | ||
348 | regmap_write(edge->ipc_regmap, edge->ipc_offset, BIT(edge->ipc_bit)); | |
349 | } | |
350 | ||
351 | /* | |
352 | * Initialize the tx channel info | |
353 | */ | |
354 | static void qcom_smd_channel_reset(struct qcom_smd_channel *channel) | |
355 | { | |
356 | SET_TX_CHANNEL_INFO(channel, state, SMD_CHANNEL_CLOSED); | |
24f60e37 SB |
357 | SET_TX_CHANNEL_FLAG(channel, fDSR, 0); |
358 | SET_TX_CHANNEL_FLAG(channel, fCTS, 0); | |
359 | SET_TX_CHANNEL_FLAG(channel, fCD, 0); | |
360 | SET_TX_CHANNEL_FLAG(channel, fRI, 0); | |
361 | SET_TX_CHANNEL_FLAG(channel, fHEAD, 0); | |
362 | SET_TX_CHANNEL_FLAG(channel, fTAIL, 0); | |
363 | SET_TX_CHANNEL_FLAG(channel, fSTATE, 1); | |
364 | SET_TX_CHANNEL_FLAG(channel, fBLOCKREADINTR, 1); | |
f2ab3298 | 365 | SET_TX_CHANNEL_INFO(channel, head, 0); |
4e21a95d | 366 | SET_RX_CHANNEL_INFO(channel, tail, 0); |
f2ab3298 BA |
367 | |
368 | qcom_smd_signal_channel(channel); | |
369 | ||
370 | channel->state = SMD_CHANNEL_CLOSED; | |
371 | channel->pkt_size = 0; | |
372 | } | |
373 | ||
39f0db29 BA |
374 | /* |
375 | * Set the callback for a channel, with appropriate locking | |
376 | */ | |
377 | static void qcom_smd_channel_set_callback(struct qcom_smd_channel *channel, | |
378 | qcom_smd_cb_t cb) | |
379 | { | |
380 | unsigned long flags; | |
381 | ||
382 | spin_lock_irqsave(&channel->recv_lock, flags); | |
383 | channel->cb = cb; | |
384 | spin_unlock_irqrestore(&channel->recv_lock, flags); | |
385 | }; | |
386 | ||
f2ab3298 BA |
387 | /* |
388 | * Calculate the amount of data available in the rx fifo | |
389 | */ | |
390 | static size_t qcom_smd_channel_get_rx_avail(struct qcom_smd_channel *channel) | |
391 | { | |
392 | unsigned head; | |
393 | unsigned tail; | |
394 | ||
395 | head = GET_RX_CHANNEL_INFO(channel, head); | |
396 | tail = GET_RX_CHANNEL_INFO(channel, tail); | |
397 | ||
398 | return (head - tail) & (channel->fifo_size - 1); | |
399 | } | |
400 | ||
401 | /* | |
402 | * Set tx channel state and inform the remote processor | |
403 | */ | |
404 | static void qcom_smd_channel_set_state(struct qcom_smd_channel *channel, | |
405 | int state) | |
406 | { | |
407 | struct qcom_smd_edge *edge = channel->edge; | |
408 | bool is_open = state == SMD_CHANNEL_OPENED; | |
409 | ||
410 | if (channel->state == state) | |
411 | return; | |
412 | ||
da057302 | 413 | dev_dbg(&edge->dev, "set_state(%s, %d)\n", channel->name, state); |
f2ab3298 | 414 | |
24f60e37 SB |
415 | SET_TX_CHANNEL_FLAG(channel, fDSR, is_open); |
416 | SET_TX_CHANNEL_FLAG(channel, fCTS, is_open); | |
417 | SET_TX_CHANNEL_FLAG(channel, fCD, is_open); | |
f2ab3298 BA |
418 | |
419 | SET_TX_CHANNEL_INFO(channel, state, state); | |
24f60e37 | 420 | SET_TX_CHANNEL_FLAG(channel, fSTATE, 1); |
f2ab3298 BA |
421 | |
422 | channel->state = state; | |
423 | qcom_smd_signal_channel(channel); | |
424 | } | |
425 | ||
426 | /* | |
427 | * Copy count bytes of data using 32bit accesses, if that's required. | |
428 | */ | |
3b781e55 SB |
429 | static void smd_copy_to_fifo(void __iomem *dst, |
430 | const void *src, | |
f2ab3298 BA |
431 | size_t count, |
432 | bool word_aligned) | |
433 | { | |
f2ab3298 | 434 | if (word_aligned) { |
3b781e55 | 435 | __iowrite32_copy(dst, src, count / sizeof(u32)); |
f2ab3298 | 436 | } else { |
3b781e55 | 437 | memcpy_toio(dst, src, count); |
f2ab3298 BA |
438 | } |
439 | } | |
440 | ||
441 | /* | |
442 | * Copy count bytes of data using 32bit accesses, if that is required. | |
443 | */ | |
c431e678 SB |
444 | static void smd_copy_from_fifo(void *dst, |
445 | const void __iomem *src, | |
f2ab3298 BA |
446 | size_t count, |
447 | bool word_aligned) | |
448 | { | |
f2ab3298 | 449 | if (word_aligned) { |
c431e678 | 450 | __ioread32_copy(dst, src, count / sizeof(u32)); |
f2ab3298 | 451 | } else { |
c431e678 | 452 | memcpy_fromio(dst, src, count); |
f2ab3298 BA |
453 | } |
454 | } | |
455 | ||
456 | /* | |
457 | * Read count bytes of data from the rx fifo into buf, but don't advance the | |
458 | * tail. | |
459 | */ | |
460 | static size_t qcom_smd_channel_peek(struct qcom_smd_channel *channel, | |
461 | void *buf, size_t count) | |
462 | { | |
463 | bool word_aligned; | |
464 | unsigned tail; | |
465 | size_t len; | |
466 | ||
f02dc825 | 467 | word_aligned = channel->info_word; |
f2ab3298 BA |
468 | tail = GET_RX_CHANNEL_INFO(channel, tail); |
469 | ||
470 | len = min_t(size_t, count, channel->fifo_size - tail); | |
471 | if (len) { | |
472 | smd_copy_from_fifo(buf, | |
473 | channel->rx_fifo + tail, | |
474 | len, | |
475 | word_aligned); | |
476 | } | |
477 | ||
478 | if (len != count) { | |
479 | smd_copy_from_fifo(buf + len, | |
480 | channel->rx_fifo, | |
481 | count - len, | |
482 | word_aligned); | |
483 | } | |
484 | ||
485 | return count; | |
486 | } | |
487 | ||
488 | /* | |
489 | * Advance the rx tail by count bytes. | |
490 | */ | |
491 | static void qcom_smd_channel_advance(struct qcom_smd_channel *channel, | |
492 | size_t count) | |
493 | { | |
494 | unsigned tail; | |
495 | ||
496 | tail = GET_RX_CHANNEL_INFO(channel, tail); | |
497 | tail += count; | |
498 | tail &= (channel->fifo_size - 1); | |
499 | SET_RX_CHANNEL_INFO(channel, tail, tail); | |
500 | } | |
501 | ||
502 | /* | |
503 | * Read out a single packet from the rx fifo and deliver it to the device | |
504 | */ | |
505 | static int qcom_smd_channel_recv_single(struct qcom_smd_channel *channel) | |
506 | { | |
f2ab3298 BA |
507 | unsigned tail; |
508 | size_t len; | |
509 | void *ptr; | |
510 | int ret; | |
511 | ||
512 | if (!channel->cb) | |
513 | return 0; | |
514 | ||
515 | tail = GET_RX_CHANNEL_INFO(channel, tail); | |
516 | ||
517 | /* Use bounce buffer if the data wraps */ | |
518 | if (tail + channel->pkt_size >= channel->fifo_size) { | |
519 | ptr = channel->bounce_buffer; | |
520 | len = qcom_smd_channel_peek(channel, ptr, channel->pkt_size); | |
521 | } else { | |
522 | ptr = channel->rx_fifo + tail; | |
523 | len = channel->pkt_size; | |
524 | } | |
525 | ||
b853cb96 | 526 | ret = channel->cb(channel, ptr, len); |
f2ab3298 BA |
527 | if (ret < 0) |
528 | return ret; | |
529 | ||
530 | /* Only forward the tail if the client consumed the data */ | |
531 | qcom_smd_channel_advance(channel, len); | |
532 | ||
533 | channel->pkt_size = 0; | |
534 | ||
535 | return 0; | |
536 | } | |
537 | ||
538 | /* | |
539 | * Per channel interrupt handling | |
540 | */ | |
541 | static bool qcom_smd_channel_intr(struct qcom_smd_channel *channel) | |
542 | { | |
543 | bool need_state_scan = false; | |
544 | int remote_state; | |
24f60e37 | 545 | __le32 pktlen; |
f2ab3298 BA |
546 | int avail; |
547 | int ret; | |
548 | ||
549 | /* Handle state changes */ | |
550 | remote_state = GET_RX_CHANNEL_INFO(channel, state); | |
551 | if (remote_state != channel->remote_state) { | |
552 | channel->remote_state = remote_state; | |
553 | need_state_scan = true; | |
554 | } | |
555 | /* Indicate that we have seen any state change */ | |
24f60e37 | 556 | SET_RX_CHANNEL_FLAG(channel, fSTATE, 0); |
f2ab3298 BA |
557 | |
558 | /* Signal waiting qcom_smd_send() about the interrupt */ | |
24f60e37 | 559 | if (!GET_TX_CHANNEL_FLAG(channel, fBLOCKREADINTR)) |
f2ab3298 BA |
560 | wake_up_interruptible(&channel->fblockread_event); |
561 | ||
562 | /* Don't consume any data until we've opened the channel */ | |
563 | if (channel->state != SMD_CHANNEL_OPENED) | |
564 | goto out; | |
565 | ||
566 | /* Indicate that we've seen the new data */ | |
24f60e37 | 567 | SET_RX_CHANNEL_FLAG(channel, fHEAD, 0); |
f2ab3298 BA |
568 | |
569 | /* Consume data */ | |
570 | for (;;) { | |
571 | avail = qcom_smd_channel_get_rx_avail(channel); | |
572 | ||
573 | if (!channel->pkt_size && avail >= SMD_PACKET_HEADER_LEN) { | |
574 | qcom_smd_channel_peek(channel, &pktlen, sizeof(pktlen)); | |
575 | qcom_smd_channel_advance(channel, SMD_PACKET_HEADER_LEN); | |
24f60e37 | 576 | channel->pkt_size = le32_to_cpu(pktlen); |
f2ab3298 BA |
577 | } else if (channel->pkt_size && avail >= channel->pkt_size) { |
578 | ret = qcom_smd_channel_recv_single(channel); | |
579 | if (ret) | |
580 | break; | |
581 | } else { | |
582 | break; | |
583 | } | |
584 | } | |
585 | ||
586 | /* Indicate that we have seen and updated tail */ | |
24f60e37 | 587 | SET_RX_CHANNEL_FLAG(channel, fTAIL, 1); |
f2ab3298 BA |
588 | |
589 | /* Signal the remote that we've consumed the data (if requested) */ | |
24f60e37 | 590 | if (!GET_RX_CHANNEL_FLAG(channel, fBLOCKREADINTR)) { |
f2ab3298 BA |
591 | /* Ensure ordering of channel info updates */ |
592 | wmb(); | |
593 | ||
594 | qcom_smd_signal_channel(channel); | |
595 | } | |
596 | ||
597 | out: | |
598 | return need_state_scan; | |
599 | } | |
600 | ||
601 | /* | |
602 | * The edge interrupts are triggered by the remote processor on state changes, | |
603 | * channel info updates or when new channels are created. | |
604 | */ | |
605 | static irqreturn_t qcom_smd_edge_intr(int irq, void *data) | |
606 | { | |
607 | struct qcom_smd_edge *edge = data; | |
608 | struct qcom_smd_channel *channel; | |
609 | unsigned available; | |
995b170a BA |
610 | bool kick_scanner = false; |
611 | bool kick_state = false; | |
f2ab3298 BA |
612 | |
613 | /* | |
614 | * Handle state changes or data on each of the channels on this edge | |
615 | */ | |
616 | spin_lock(&edge->channels_lock); | |
617 | list_for_each_entry(channel, &edge->channels, list) { | |
618 | spin_lock(&channel->recv_lock); | |
995b170a | 619 | kick_state |= qcom_smd_channel_intr(channel); |
f2ab3298 BA |
620 | spin_unlock(&channel->recv_lock); |
621 | } | |
622 | spin_unlock(&edge->channels_lock); | |
623 | ||
624 | /* | |
625 | * Creating a new channel requires allocating an smem entry, so we only | |
626 | * have to scan if the amount of available space in smem have changed | |
627 | * since last scan. | |
628 | */ | |
93dbed91 | 629 | available = qcom_smem_get_free_space(edge->remote_pid); |
f2ab3298 BA |
630 | if (available != edge->smem_available) { |
631 | edge->smem_available = available; | |
995b170a | 632 | kick_scanner = true; |
f2ab3298 BA |
633 | } |
634 | ||
995b170a BA |
635 | if (kick_scanner) |
636 | schedule_work(&edge->scan_work); | |
637 | if (kick_state) | |
638 | schedule_work(&edge->state_work); | |
f2ab3298 BA |
639 | |
640 | return IRQ_HANDLED; | |
641 | } | |
642 | ||
643 | /* | |
644 | * Delivers any outstanding packets in the rx fifo, can be used after probe of | |
645 | * the clients to deliver any packets that wasn't delivered before the client | |
646 | * was setup. | |
647 | */ | |
648 | static void qcom_smd_channel_resume(struct qcom_smd_channel *channel) | |
649 | { | |
650 | unsigned long flags; | |
651 | ||
652 | spin_lock_irqsave(&channel->recv_lock, flags); | |
653 | qcom_smd_channel_intr(channel); | |
654 | spin_unlock_irqrestore(&channel->recv_lock, flags); | |
655 | } | |
656 | ||
657 | /* | |
658 | * Calculate how much space is available in the tx fifo. | |
659 | */ | |
660 | static size_t qcom_smd_get_tx_avail(struct qcom_smd_channel *channel) | |
661 | { | |
662 | unsigned head; | |
663 | unsigned tail; | |
664 | unsigned mask = channel->fifo_size - 1; | |
665 | ||
666 | head = GET_TX_CHANNEL_INFO(channel, head); | |
667 | tail = GET_TX_CHANNEL_INFO(channel, tail); | |
668 | ||
669 | return mask - ((head - tail) & mask); | |
670 | } | |
671 | ||
672 | /* | |
673 | * Write count bytes of data into channel, possibly wrapping in the ring buffer | |
674 | */ | |
675 | static int qcom_smd_write_fifo(struct qcom_smd_channel *channel, | |
676 | const void *data, | |
677 | size_t count) | |
678 | { | |
679 | bool word_aligned; | |
680 | unsigned head; | |
681 | size_t len; | |
682 | ||
f02dc825 | 683 | word_aligned = channel->info_word; |
f2ab3298 BA |
684 | head = GET_TX_CHANNEL_INFO(channel, head); |
685 | ||
686 | len = min_t(size_t, count, channel->fifo_size - head); | |
687 | if (len) { | |
688 | smd_copy_to_fifo(channel->tx_fifo + head, | |
689 | data, | |
690 | len, | |
691 | word_aligned); | |
692 | } | |
693 | ||
694 | if (len != count) { | |
695 | smd_copy_to_fifo(channel->tx_fifo, | |
696 | data + len, | |
697 | count - len, | |
698 | word_aligned); | |
699 | } | |
700 | ||
701 | head += count; | |
702 | head &= (channel->fifo_size - 1); | |
703 | SET_TX_CHANNEL_INFO(channel, head, head); | |
704 | ||
705 | return count; | |
706 | } | |
707 | ||
708 | /** | |
709 | * qcom_smd_send - write data to smd channel | |
710 | * @channel: channel handle | |
711 | * @data: buffer of data to write | |
712 | * @len: number of bytes to write | |
713 | * | |
714 | * This is a blocking write of len bytes into the channel's tx ring buffer and | |
715 | * signal the remote end. It will sleep until there is enough space available | |
716 | * in the tx buffer, utilizing the fBLOCKREADINTR signaling mechanism to avoid | |
717 | * polling. | |
718 | */ | |
719 | int qcom_smd_send(struct qcom_smd_channel *channel, const void *data, int len) | |
720 | { | |
24f60e37 | 721 | __le32 hdr[5] = { cpu_to_le32(len), }; |
f2ab3298 BA |
722 | int tlen = sizeof(hdr) + len; |
723 | int ret; | |
724 | ||
725 | /* Word aligned channels only accept word size aligned data */ | |
f02dc825 | 726 | if (channel->info_word && len % 4) |
f2ab3298 BA |
727 | return -EINVAL; |
728 | ||
a208ca98 BA |
729 | /* Reject packets that are too big */ |
730 | if (tlen >= channel->fifo_size) | |
731 | return -EINVAL; | |
732 | ||
f2ab3298 BA |
733 | ret = mutex_lock_interruptible(&channel->tx_lock); |
734 | if (ret) | |
735 | return ret; | |
736 | ||
737 | while (qcom_smd_get_tx_avail(channel) < tlen) { | |
738 | if (channel->state != SMD_CHANNEL_OPENED) { | |
739 | ret = -EPIPE; | |
740 | goto out; | |
741 | } | |
742 | ||
24f60e37 | 743 | SET_TX_CHANNEL_FLAG(channel, fBLOCKREADINTR, 0); |
f2ab3298 BA |
744 | |
745 | ret = wait_event_interruptible(channel->fblockread_event, | |
746 | qcom_smd_get_tx_avail(channel) >= tlen || | |
747 | channel->state != SMD_CHANNEL_OPENED); | |
748 | if (ret) | |
749 | goto out; | |
750 | ||
24f60e37 | 751 | SET_TX_CHANNEL_FLAG(channel, fBLOCKREADINTR, 1); |
f2ab3298 BA |
752 | } |
753 | ||
24f60e37 | 754 | SET_TX_CHANNEL_FLAG(channel, fTAIL, 0); |
f2ab3298 BA |
755 | |
756 | qcom_smd_write_fifo(channel, hdr, sizeof(hdr)); | |
757 | qcom_smd_write_fifo(channel, data, len); | |
758 | ||
24f60e37 | 759 | SET_TX_CHANNEL_FLAG(channel, fHEAD, 1); |
f2ab3298 BA |
760 | |
761 | /* Ensure ordering of channel info updates */ | |
762 | wmb(); | |
763 | ||
764 | qcom_smd_signal_channel(channel); | |
765 | ||
766 | out: | |
767 | mutex_unlock(&channel->tx_lock); | |
768 | ||
769 | return ret; | |
770 | } | |
771 | EXPORT_SYMBOL(qcom_smd_send); | |
772 | ||
773 | static struct qcom_smd_device *to_smd_device(struct device *dev) | |
774 | { | |
775 | return container_of(dev, struct qcom_smd_device, dev); | |
776 | } | |
777 | ||
778 | static struct qcom_smd_driver *to_smd_driver(struct device *dev) | |
779 | { | |
780 | struct qcom_smd_device *qsdev = to_smd_device(dev); | |
781 | ||
782 | return container_of(qsdev->dev.driver, struct qcom_smd_driver, driver); | |
783 | } | |
784 | ||
785 | static int qcom_smd_dev_match(struct device *dev, struct device_driver *drv) | |
786 | { | |
1a7caca2 BA |
787 | struct qcom_smd_device *qsdev = to_smd_device(dev); |
788 | struct qcom_smd_driver *qsdrv = container_of(drv, struct qcom_smd_driver, driver); | |
789 | const struct qcom_smd_id *match = qsdrv->smd_match_table; | |
790 | const char *name = qsdev->channel->name; | |
791 | ||
792 | if (match) { | |
793 | while (match->name[0]) { | |
794 | if (!strcmp(match->name, name)) | |
795 | return 1; | |
796 | match++; | |
797 | } | |
798 | } | |
799 | ||
f2ab3298 BA |
800 | return of_driver_match_device(dev, drv); |
801 | } | |
802 | ||
803 | /* | |
3fd3f2fd | 804 | * Helper for opening a channel |
f2ab3298 | 805 | */ |
3fd3f2fd BA |
806 | static int qcom_smd_channel_open(struct qcom_smd_channel *channel, |
807 | qcom_smd_cb_t cb) | |
f2ab3298 | 808 | { |
f2ab3298 | 809 | size_t bb_size; |
f2ab3298 BA |
810 | |
811 | /* | |
812 | * Packets are maximum 4k, but reduce if the fifo is smaller | |
813 | */ | |
814 | bb_size = min(channel->fifo_size, SZ_4K); | |
815 | channel->bounce_buffer = kmalloc(bb_size, GFP_KERNEL); | |
816 | if (!channel->bounce_buffer) | |
817 | return -ENOMEM; | |
818 | ||
3fd3f2fd | 819 | qcom_smd_channel_set_callback(channel, cb); |
f2ab3298 | 820 | qcom_smd_channel_set_state(channel, SMD_CHANNEL_OPENING); |
f2ab3298 BA |
821 | qcom_smd_channel_set_state(channel, SMD_CHANNEL_OPENED); |
822 | ||
3fd3f2fd BA |
823 | return 0; |
824 | } | |
825 | ||
826 | /* | |
827 | * Helper for closing and resetting a channel | |
828 | */ | |
829 | static void qcom_smd_channel_close(struct qcom_smd_channel *channel) | |
830 | { | |
831 | qcom_smd_channel_set_callback(channel, NULL); | |
832 | ||
833 | kfree(channel->bounce_buffer); | |
834 | channel->bounce_buffer = NULL; | |
835 | ||
836 | qcom_smd_channel_set_state(channel, SMD_CHANNEL_CLOSED); | |
837 | qcom_smd_channel_reset(channel); | |
838 | } | |
839 | ||
840 | /* | |
841 | * Probe the smd client. | |
842 | * | |
843 | * The remote side have indicated that it want the channel to be opened, so | |
844 | * complete the state handshake and probe our client driver. | |
845 | */ | |
846 | static int qcom_smd_dev_probe(struct device *dev) | |
847 | { | |
848 | struct qcom_smd_device *qsdev = to_smd_device(dev); | |
849 | struct qcom_smd_driver *qsdrv = to_smd_driver(dev); | |
850 | struct qcom_smd_channel *channel = qsdev->channel; | |
851 | int ret; | |
852 | ||
853 | ret = qcom_smd_channel_open(channel, qsdrv->callback); | |
854 | if (ret) | |
855 | return ret; | |
856 | ||
f2ab3298 BA |
857 | ret = qsdrv->probe(qsdev); |
858 | if (ret) | |
859 | goto err; | |
860 | ||
861 | qcom_smd_channel_resume(channel); | |
862 | ||
863 | return 0; | |
864 | ||
865 | err: | |
866 | dev_err(&qsdev->dev, "probe failed\n"); | |
867 | ||
3fd3f2fd | 868 | qcom_smd_channel_close(channel); |
f2ab3298 BA |
869 | return ret; |
870 | } | |
871 | ||
872 | /* | |
873 | * Remove the smd client. | |
874 | * | |
875 | * The channel is going away, for some reason, so remove the smd client and | |
876 | * reset the channel state. | |
877 | */ | |
878 | static int qcom_smd_dev_remove(struct device *dev) | |
879 | { | |
880 | struct qcom_smd_device *qsdev = to_smd_device(dev); | |
881 | struct qcom_smd_driver *qsdrv = to_smd_driver(dev); | |
882 | struct qcom_smd_channel *channel = qsdev->channel; | |
f2ab3298 BA |
883 | |
884 | qcom_smd_channel_set_state(channel, SMD_CHANNEL_CLOSING); | |
885 | ||
886 | /* | |
887 | * Make sure we don't race with the code receiving data. | |
888 | */ | |
39f0db29 | 889 | qcom_smd_channel_set_callback(channel, NULL); |
f2ab3298 BA |
890 | |
891 | /* Wake up any sleepers in qcom_smd_send() */ | |
892 | wake_up_interruptible(&channel->fblockread_event); | |
893 | ||
894 | /* | |
895 | * We expect that the client might block in remove() waiting for any | |
896 | * outstanding calls to qcom_smd_send() to wake up and finish. | |
897 | */ | |
898 | if (qsdrv->remove) | |
899 | qsdrv->remove(qsdev); | |
900 | ||
0a0c08ca BA |
901 | /* The client is now gone, close the primary channel */ |
902 | qcom_smd_channel_close(channel); | |
903 | channel->qsdev = NULL; | |
f2ab3298 BA |
904 | |
905 | return 0; | |
906 | } | |
907 | ||
908 | static struct bus_type qcom_smd_bus = { | |
909 | .name = "qcom_smd", | |
910 | .match = qcom_smd_dev_match, | |
911 | .probe = qcom_smd_dev_probe, | |
912 | .remove = qcom_smd_dev_remove, | |
913 | }; | |
914 | ||
915 | /* | |
916 | * Release function for the qcom_smd_device object. | |
917 | */ | |
918 | static void qcom_smd_release_device(struct device *dev) | |
919 | { | |
920 | struct qcom_smd_device *qsdev = to_smd_device(dev); | |
921 | ||
922 | kfree(qsdev); | |
923 | } | |
924 | ||
925 | /* | |
926 | * Finds the device_node for the smd child interested in this channel. | |
927 | */ | |
928 | static struct device_node *qcom_smd_match_channel(struct device_node *edge_node, | |
929 | const char *channel) | |
930 | { | |
931 | struct device_node *child; | |
932 | const char *name; | |
933 | const char *key; | |
934 | int ret; | |
935 | ||
936 | for_each_available_child_of_node(edge_node, child) { | |
937 | key = "qcom,smd-channels"; | |
938 | ret = of_property_read_string(child, key, &name); | |
6083096d | 939 | if (ret) |
f2ab3298 | 940 | continue; |
f2ab3298 BA |
941 | |
942 | if (strcmp(name, channel) == 0) | |
943 | return child; | |
944 | } | |
945 | ||
946 | return NULL; | |
947 | } | |
948 | ||
949 | /* | |
950 | * Create a smd client device for channel that is being opened. | |
951 | */ | |
952 | static int qcom_smd_create_device(struct qcom_smd_channel *channel) | |
953 | { | |
954 | struct qcom_smd_device *qsdev; | |
955 | struct qcom_smd_edge *edge = channel->edge; | |
956 | struct device_node *node; | |
f2ab3298 BA |
957 | int ret; |
958 | ||
959 | if (channel->qsdev) | |
960 | return -EEXIST; | |
961 | ||
da057302 | 962 | dev_dbg(&edge->dev, "registering '%s'\n", channel->name); |
f2ab3298 BA |
963 | |
964 | qsdev = kzalloc(sizeof(*qsdev), GFP_KERNEL); | |
965 | if (!qsdev) | |
966 | return -ENOMEM; | |
967 | ||
1a7caca2 BA |
968 | node = qcom_smd_match_channel(edge->of_node, channel->name); |
969 | dev_set_name(&qsdev->dev, "%s.%s", | |
970 | edge->of_node->name, | |
971 | node ? node->name : channel->name); | |
972 | ||
da057302 | 973 | qsdev->dev.parent = &edge->dev; |
f2ab3298 BA |
974 | qsdev->dev.bus = &qcom_smd_bus; |
975 | qsdev->dev.release = qcom_smd_release_device; | |
976 | qsdev->dev.of_node = node; | |
977 | ||
978 | qsdev->channel = channel; | |
979 | ||
980 | channel->qsdev = qsdev; | |
981 | ||
982 | ret = device_register(&qsdev->dev); | |
983 | if (ret) { | |
da057302 | 984 | dev_err(&edge->dev, "device_register failed: %d\n", ret); |
f2ab3298 BA |
985 | put_device(&qsdev->dev); |
986 | } | |
987 | ||
988 | return ret; | |
989 | } | |
990 | ||
991 | /* | |
992 | * Destroy a smd client device for a channel that's going away. | |
993 | */ | |
994 | static void qcom_smd_destroy_device(struct qcom_smd_channel *channel) | |
995 | { | |
996 | struct device *dev; | |
997 | ||
998 | BUG_ON(!channel->qsdev); | |
999 | ||
1000 | dev = &channel->qsdev->dev; | |
1001 | ||
1002 | device_unregister(dev); | |
1003 | of_node_put(dev->of_node); | |
1004 | put_device(dev); | |
1005 | } | |
1006 | ||
1007 | /** | |
1008 | * qcom_smd_driver_register - register a smd driver | |
1009 | * @qsdrv: qcom_smd_driver struct | |
1010 | */ | |
1011 | int qcom_smd_driver_register(struct qcom_smd_driver *qsdrv) | |
1012 | { | |
1013 | qsdrv->driver.bus = &qcom_smd_bus; | |
1014 | return driver_register(&qsdrv->driver); | |
1015 | } | |
1016 | EXPORT_SYMBOL(qcom_smd_driver_register); | |
1017 | ||
b853cb96 BA |
1018 | void *qcom_smd_get_drvdata(struct qcom_smd_channel *channel) |
1019 | { | |
1020 | return channel->drvdata; | |
1021 | } | |
1022 | EXPORT_SYMBOL(qcom_smd_get_drvdata); | |
1023 | ||
1024 | void qcom_smd_set_drvdata(struct qcom_smd_channel *channel, void *data) | |
1025 | { | |
1026 | channel->drvdata = data; | |
1027 | } | |
1028 | EXPORT_SYMBOL(qcom_smd_set_drvdata); | |
1029 | ||
f2ab3298 BA |
1030 | /** |
1031 | * qcom_smd_driver_unregister - unregister a smd driver | |
1032 | * @qsdrv: qcom_smd_driver struct | |
1033 | */ | |
1034 | void qcom_smd_driver_unregister(struct qcom_smd_driver *qsdrv) | |
1035 | { | |
1036 | driver_unregister(&qsdrv->driver); | |
1037 | } | |
1038 | EXPORT_SYMBOL(qcom_smd_driver_unregister); | |
1039 | ||
028021d2 BA |
1040 | static struct qcom_smd_channel * |
1041 | qcom_smd_find_channel(struct qcom_smd_edge *edge, const char *name) | |
1042 | { | |
1043 | struct qcom_smd_channel *channel; | |
1044 | struct qcom_smd_channel *ret = NULL; | |
1045 | unsigned long flags; | |
1046 | unsigned state; | |
1047 | ||
1048 | spin_lock_irqsave(&edge->channels_lock, flags); | |
1049 | list_for_each_entry(channel, &edge->channels, list) { | |
1050 | if (strcmp(channel->name, name)) | |
1051 | continue; | |
1052 | ||
1053 | state = GET_RX_CHANNEL_INFO(channel, state); | |
1054 | if (state != SMD_CHANNEL_OPENING && | |
1055 | state != SMD_CHANNEL_OPENED) | |
1056 | continue; | |
1057 | ||
1058 | ret = channel; | |
1059 | break; | |
1060 | } | |
1061 | spin_unlock_irqrestore(&edge->channels_lock, flags); | |
1062 | ||
1063 | return ret; | |
1064 | } | |
1065 | ||
1066 | /** | |
1067 | * qcom_smd_open_channel() - claim additional channels on the same edge | |
1068 | * @sdev: smd_device handle | |
1069 | * @name: channel name | |
1070 | * @cb: callback method to use for incoming data | |
1071 | * | |
1072 | * Returns a channel handle on success, or -EPROBE_DEFER if the channel isn't | |
1073 | * ready. | |
0a0c08ca BA |
1074 | * |
1075 | * Any channels returned must be closed with a call to qcom_smd_close_channel() | |
028021d2 | 1076 | */ |
b853cb96 | 1077 | struct qcom_smd_channel *qcom_smd_open_channel(struct qcom_smd_channel *parent, |
028021d2 BA |
1078 | const char *name, |
1079 | qcom_smd_cb_t cb) | |
1080 | { | |
1081 | struct qcom_smd_channel *channel; | |
b853cb96 BA |
1082 | struct qcom_smd_device *sdev = parent->qsdev; |
1083 | struct qcom_smd_edge *edge = parent->edge; | |
028021d2 BA |
1084 | int ret; |
1085 | ||
1086 | /* Wait up to HZ for the channel to appear */ | |
1087 | ret = wait_event_interruptible_timeout(edge->new_channel_event, | |
1088 | (channel = qcom_smd_find_channel(edge, name)) != NULL, | |
1089 | HZ); | |
1090 | if (!ret) | |
1091 | return ERR_PTR(-ETIMEDOUT); | |
1092 | ||
1093 | if (channel->state != SMD_CHANNEL_CLOSED) { | |
1094 | dev_err(&sdev->dev, "channel %s is busy\n", channel->name); | |
1095 | return ERR_PTR(-EBUSY); | |
1096 | } | |
1097 | ||
1098 | channel->qsdev = sdev; | |
1099 | ret = qcom_smd_channel_open(channel, cb); | |
1100 | if (ret) { | |
1101 | channel->qsdev = NULL; | |
1102 | return ERR_PTR(ret); | |
1103 | } | |
1104 | ||
028021d2 BA |
1105 | return channel; |
1106 | } | |
1107 | EXPORT_SYMBOL(qcom_smd_open_channel); | |
1108 | ||
0a0c08ca BA |
1109 | /** |
1110 | * qcom_smd_close_channel() - close an additionally opened channel | |
1111 | * @channel: channel handle, returned by qcom_smd_open_channel() | |
1112 | */ | |
1113 | void qcom_smd_close_channel(struct qcom_smd_channel *channel) | |
1114 | { | |
1115 | qcom_smd_channel_close(channel); | |
1116 | channel->qsdev = NULL; | |
1117 | } | |
1118 | EXPORT_SYMBOL(qcom_smd_close_channel); | |
1119 | ||
f2ab3298 BA |
1120 | /* |
1121 | * Allocate the qcom_smd_channel object for a newly found smd channel, | |
1122 | * retrieving and validating the smem items involved. | |
1123 | */ | |
1124 | static struct qcom_smd_channel *qcom_smd_create_channel(struct qcom_smd_edge *edge, | |
1125 | unsigned smem_info_item, | |
1126 | unsigned smem_fifo_item, | |
1127 | char *name) | |
1128 | { | |
1129 | struct qcom_smd_channel *channel; | |
f2ab3298 BA |
1130 | size_t fifo_size; |
1131 | size_t info_size; | |
1132 | void *fifo_base; | |
1133 | void *info; | |
1134 | int ret; | |
1135 | ||
da057302 | 1136 | channel = devm_kzalloc(&edge->dev, sizeof(*channel), GFP_KERNEL); |
f2ab3298 BA |
1137 | if (!channel) |
1138 | return ERR_PTR(-ENOMEM); | |
1139 | ||
1140 | channel->edge = edge; | |
da057302 | 1141 | channel->name = devm_kstrdup(&edge->dev, name, GFP_KERNEL); |
f2ab3298 BA |
1142 | if (!channel->name) |
1143 | return ERR_PTR(-ENOMEM); | |
1144 | ||
1145 | mutex_init(&channel->tx_lock); | |
1146 | spin_lock_init(&channel->recv_lock); | |
1147 | init_waitqueue_head(&channel->fblockread_event); | |
1148 | ||
1a03964d SB |
1149 | info = qcom_smem_get(edge->remote_pid, smem_info_item, &info_size); |
1150 | if (IS_ERR(info)) { | |
1151 | ret = PTR_ERR(info); | |
f2ab3298 | 1152 | goto free_name_and_channel; |
1a03964d | 1153 | } |
f2ab3298 BA |
1154 | |
1155 | /* | |
1156 | * Use the size of the item to figure out which channel info struct to | |
1157 | * use. | |
1158 | */ | |
1159 | if (info_size == 2 * sizeof(struct smd_channel_info_word)) { | |
f02dc825 | 1160 | channel->info_word = info; |
f2ab3298 | 1161 | } else if (info_size == 2 * sizeof(struct smd_channel_info)) { |
f02dc825 | 1162 | channel->info = info; |
f2ab3298 | 1163 | } else { |
da057302 | 1164 | dev_err(&edge->dev, |
f2ab3298 BA |
1165 | "channel info of size %zu not supported\n", info_size); |
1166 | ret = -EINVAL; | |
1167 | goto free_name_and_channel; | |
1168 | } | |
1169 | ||
1a03964d SB |
1170 | fifo_base = qcom_smem_get(edge->remote_pid, smem_fifo_item, &fifo_size); |
1171 | if (IS_ERR(fifo_base)) { | |
1172 | ret = PTR_ERR(fifo_base); | |
f2ab3298 | 1173 | goto free_name_and_channel; |
1a03964d | 1174 | } |
f2ab3298 BA |
1175 | |
1176 | /* The channel consist of a rx and tx fifo of equal size */ | |
1177 | fifo_size /= 2; | |
1178 | ||
da057302 | 1179 | dev_dbg(&edge->dev, "new channel '%s' info-size: %zu fifo-size: %zu\n", |
f2ab3298 BA |
1180 | name, info_size, fifo_size); |
1181 | ||
1182 | channel->tx_fifo = fifo_base; | |
1183 | channel->rx_fifo = fifo_base + fifo_size; | |
1184 | channel->fifo_size = fifo_size; | |
1185 | ||
1186 | qcom_smd_channel_reset(channel); | |
1187 | ||
1188 | return channel; | |
1189 | ||
1190 | free_name_and_channel: | |
da057302 BA |
1191 | devm_kfree(&edge->dev, channel->name); |
1192 | devm_kfree(&edge->dev, channel); | |
f2ab3298 BA |
1193 | |
1194 | return ERR_PTR(ret); | |
1195 | } | |
1196 | ||
1197 | /* | |
1198 | * Scans the allocation table for any newly allocated channels, calls | |
1199 | * qcom_smd_create_channel() to create representations of these and add | |
1200 | * them to the edge's list of channels. | |
1201 | */ | |
995b170a | 1202 | static void qcom_channel_scan_worker(struct work_struct *work) |
f2ab3298 | 1203 | { |
995b170a | 1204 | struct qcom_smd_edge *edge = container_of(work, struct qcom_smd_edge, scan_work); |
f2ab3298 BA |
1205 | struct qcom_smd_alloc_entry *alloc_tbl; |
1206 | struct qcom_smd_alloc_entry *entry; | |
1207 | struct qcom_smd_channel *channel; | |
f2ab3298 BA |
1208 | unsigned long flags; |
1209 | unsigned fifo_id; | |
1210 | unsigned info_id; | |
f2ab3298 BA |
1211 | int tbl; |
1212 | int i; | |
24f60e37 | 1213 | u32 eflags, cid; |
f2ab3298 BA |
1214 | |
1215 | for (tbl = 0; tbl < SMD_ALLOC_TBL_COUNT; tbl++) { | |
1a03964d SB |
1216 | alloc_tbl = qcom_smem_get(edge->remote_pid, |
1217 | smem_items[tbl].alloc_tbl_id, NULL); | |
1218 | if (IS_ERR(alloc_tbl)) | |
f2ab3298 BA |
1219 | continue; |
1220 | ||
1221 | for (i = 0; i < SMD_ALLOC_TBL_SIZE; i++) { | |
1222 | entry = &alloc_tbl[i]; | |
24f60e37 | 1223 | eflags = le32_to_cpu(entry->flags); |
f2ab3298 BA |
1224 | if (test_bit(i, edge->allocated[tbl])) |
1225 | continue; | |
1226 | ||
1227 | if (entry->ref_count == 0) | |
1228 | continue; | |
1229 | ||
1230 | if (!entry->name[0]) | |
1231 | continue; | |
1232 | ||
24f60e37 | 1233 | if (!(eflags & SMD_CHANNEL_FLAGS_PACKET)) |
f2ab3298 BA |
1234 | continue; |
1235 | ||
24f60e37 | 1236 | if ((eflags & SMD_CHANNEL_FLAGS_EDGE_MASK) != edge->edge_id) |
f2ab3298 BA |
1237 | continue; |
1238 | ||
24f60e37 SB |
1239 | cid = le32_to_cpu(entry->cid); |
1240 | info_id = smem_items[tbl].info_base_id + cid; | |
1241 | fifo_id = smem_items[tbl].fifo_base_id + cid; | |
f2ab3298 BA |
1242 | |
1243 | channel = qcom_smd_create_channel(edge, info_id, fifo_id, entry->name); | |
1244 | if (IS_ERR(channel)) | |
1245 | continue; | |
1246 | ||
1247 | spin_lock_irqsave(&edge->channels_lock, flags); | |
1248 | list_add(&channel->list, &edge->channels); | |
1249 | spin_unlock_irqrestore(&edge->channels_lock, flags); | |
1250 | ||
da057302 | 1251 | dev_dbg(&edge->dev, "new channel found: '%s'\n", channel->name); |
f2ab3298 | 1252 | set_bit(i, edge->allocated[tbl]); |
028021d2 BA |
1253 | |
1254 | wake_up_interruptible(&edge->new_channel_event); | |
f2ab3298 BA |
1255 | } |
1256 | } | |
1257 | ||
995b170a | 1258 | schedule_work(&edge->state_work); |
f2ab3298 BA |
1259 | } |
1260 | ||
1261 | /* | |
1262 | * This per edge worker scans smem for any new channels and register these. It | |
1263 | * then scans all registered channels for state changes that should be handled | |
1264 | * by creating or destroying smd client devices for the registered channels. | |
1265 | * | |
995b170a BA |
1266 | * LOCKING: edge->channels_lock only needs to cover the list operations, as the |
1267 | * worker is killed before any channels are deallocated | |
f2ab3298 BA |
1268 | */ |
1269 | static void qcom_channel_state_worker(struct work_struct *work) | |
1270 | { | |
1271 | struct qcom_smd_channel *channel; | |
1272 | struct qcom_smd_edge *edge = container_of(work, | |
1273 | struct qcom_smd_edge, | |
995b170a | 1274 | state_work); |
f2ab3298 | 1275 | unsigned remote_state; |
995b170a | 1276 | unsigned long flags; |
f2ab3298 BA |
1277 | |
1278 | /* | |
1279 | * Register a device for any closed channel where the remote processor | |
1280 | * is showing interest in opening the channel. | |
1281 | */ | |
995b170a | 1282 | spin_lock_irqsave(&edge->channels_lock, flags); |
f2ab3298 BA |
1283 | list_for_each_entry(channel, &edge->channels, list) { |
1284 | if (channel->state != SMD_CHANNEL_CLOSED) | |
1285 | continue; | |
1286 | ||
1287 | remote_state = GET_RX_CHANNEL_INFO(channel, state); | |
1288 | if (remote_state != SMD_CHANNEL_OPENING && | |
1289 | remote_state != SMD_CHANNEL_OPENED) | |
1290 | continue; | |
1291 | ||
995b170a | 1292 | spin_unlock_irqrestore(&edge->channels_lock, flags); |
f2ab3298 | 1293 | qcom_smd_create_device(channel); |
995b170a | 1294 | spin_lock_irqsave(&edge->channels_lock, flags); |
f2ab3298 BA |
1295 | } |
1296 | ||
1297 | /* | |
1298 | * Unregister the device for any channel that is opened where the | |
1299 | * remote processor is closing the channel. | |
1300 | */ | |
1301 | list_for_each_entry(channel, &edge->channels, list) { | |
1302 | if (channel->state != SMD_CHANNEL_OPENING && | |
1303 | channel->state != SMD_CHANNEL_OPENED) | |
1304 | continue; | |
1305 | ||
1306 | remote_state = GET_RX_CHANNEL_INFO(channel, state); | |
1307 | if (remote_state == SMD_CHANNEL_OPENING || | |
1308 | remote_state == SMD_CHANNEL_OPENED) | |
1309 | continue; | |
1310 | ||
995b170a | 1311 | spin_unlock_irqrestore(&edge->channels_lock, flags); |
f2ab3298 | 1312 | qcom_smd_destroy_device(channel); |
995b170a | 1313 | spin_lock_irqsave(&edge->channels_lock, flags); |
f2ab3298 | 1314 | } |
995b170a | 1315 | spin_unlock_irqrestore(&edge->channels_lock, flags); |
f2ab3298 BA |
1316 | } |
1317 | ||
1318 | /* | |
1319 | * Parses an of_node describing an edge. | |
1320 | */ | |
1321 | static int qcom_smd_parse_edge(struct device *dev, | |
1322 | struct device_node *node, | |
1323 | struct qcom_smd_edge *edge) | |
1324 | { | |
1325 | struct device_node *syscon_np; | |
1326 | const char *key; | |
1327 | int irq; | |
1328 | int ret; | |
1329 | ||
1330 | INIT_LIST_HEAD(&edge->channels); | |
1331 | spin_lock_init(&edge->channels_lock); | |
1332 | ||
995b170a BA |
1333 | INIT_WORK(&edge->scan_work, qcom_channel_scan_worker); |
1334 | INIT_WORK(&edge->state_work, qcom_channel_state_worker); | |
f2ab3298 BA |
1335 | |
1336 | edge->of_node = of_node_get(node); | |
1337 | ||
f2ab3298 BA |
1338 | key = "qcom,smd-edge"; |
1339 | ret = of_property_read_u32(node, key, &edge->edge_id); | |
1340 | if (ret) { | |
1341 | dev_err(dev, "edge missing %s property\n", key); | |
1342 | return -EINVAL; | |
1343 | } | |
1344 | ||
93dbed91 AG |
1345 | edge->remote_pid = QCOM_SMEM_HOST_ANY; |
1346 | key = "qcom,remote-pid"; | |
1347 | of_property_read_u32(node, key, &edge->remote_pid); | |
1348 | ||
f2ab3298 BA |
1349 | syscon_np = of_parse_phandle(node, "qcom,ipc", 0); |
1350 | if (!syscon_np) { | |
1351 | dev_err(dev, "no qcom,ipc node\n"); | |
1352 | return -ENODEV; | |
1353 | } | |
1354 | ||
1355 | edge->ipc_regmap = syscon_node_to_regmap(syscon_np); | |
1356 | if (IS_ERR(edge->ipc_regmap)) | |
1357 | return PTR_ERR(edge->ipc_regmap); | |
1358 | ||
1359 | key = "qcom,ipc"; | |
1360 | ret = of_property_read_u32_index(node, key, 1, &edge->ipc_offset); | |
1361 | if (ret < 0) { | |
1362 | dev_err(dev, "no offset in %s\n", key); | |
1363 | return -EINVAL; | |
1364 | } | |
1365 | ||
1366 | ret = of_property_read_u32_index(node, key, 2, &edge->ipc_bit); | |
1367 | if (ret < 0) { | |
1368 | dev_err(dev, "no bit in %s\n", key); | |
1369 | return -EINVAL; | |
1370 | } | |
1371 | ||
381a0b4c BA |
1372 | irq = irq_of_parse_and_map(node, 0); |
1373 | if (irq < 0) { | |
1374 | dev_err(dev, "required smd interrupt missing\n"); | |
1375 | return -EINVAL; | |
1376 | } | |
1377 | ||
1378 | ret = devm_request_irq(dev, irq, | |
1379 | qcom_smd_edge_intr, IRQF_TRIGGER_RISING, | |
1380 | node->name, edge); | |
1381 | if (ret) { | |
1382 | dev_err(dev, "failed to request smd irq\n"); | |
1383 | return ret; | |
1384 | } | |
1385 | ||
1386 | edge->irq = irq; | |
1387 | ||
f2ab3298 BA |
1388 | return 0; |
1389 | } | |
1390 | ||
da057302 BA |
1391 | /* |
1392 | * Release function for an edge. | |
1393 | * Reset the state of each associated channel and free the edge context. | |
1394 | */ | |
1395 | static void qcom_smd_edge_release(struct device *dev) | |
1396 | { | |
1397 | struct qcom_smd_channel *channel; | |
1398 | struct qcom_smd_edge *edge = to_smd_edge(dev); | |
1399 | ||
1400 | list_for_each_entry(channel, &edge->channels, list) { | |
1401 | SET_RX_CHANNEL_INFO(channel, state, SMD_CHANNEL_CLOSED); | |
1402 | SET_RX_CHANNEL_INFO(channel, head, 0); | |
1403 | SET_RX_CHANNEL_INFO(channel, tail, 0); | |
1404 | } | |
1405 | ||
1406 | kfree(edge); | |
1407 | } | |
1408 | ||
1409 | /** | |
1410 | * qcom_smd_register_edge() - register an edge based on an device_node | |
1411 | * @parent: parent device for the edge | |
1412 | * @node: device_node describing the edge | |
1413 | * | |
1414 | * Returns an edge reference, or negative ERR_PTR() on failure. | |
1415 | */ | |
1416 | struct qcom_smd_edge *qcom_smd_register_edge(struct device *parent, | |
1417 | struct device_node *node) | |
f2ab3298 BA |
1418 | { |
1419 | struct qcom_smd_edge *edge; | |
f2ab3298 | 1420 | int ret; |
da057302 BA |
1421 | |
1422 | edge = kzalloc(sizeof(*edge), GFP_KERNEL); | |
1423 | if (!edge) | |
1424 | return ERR_PTR(-ENOMEM); | |
1425 | ||
1426 | init_waitqueue_head(&edge->new_channel_event); | |
1427 | ||
1428 | edge->dev.parent = parent; | |
1429 | edge->dev.release = qcom_smd_edge_release; | |
1430 | dev_set_name(&edge->dev, "%s:%s", dev_name(parent), node->name); | |
1431 | ret = device_register(&edge->dev); | |
1432 | if (ret) { | |
1433 | pr_err("failed to register smd edge\n"); | |
1434 | return ERR_PTR(ret); | |
1435 | } | |
1436 | ||
1437 | ret = qcom_smd_parse_edge(&edge->dev, node, edge); | |
1438 | if (ret) { | |
1439 | dev_err(&edge->dev, "failed to parse smd edge\n"); | |
1440 | goto unregister_dev; | |
1441 | } | |
1442 | ||
1443 | schedule_work(&edge->scan_work); | |
1444 | ||
1445 | return edge; | |
1446 | ||
1447 | unregister_dev: | |
1448 | put_device(&edge->dev); | |
1449 | return ERR_PTR(ret); | |
1450 | } | |
1451 | EXPORT_SYMBOL(qcom_smd_register_edge); | |
1452 | ||
1453 | static int qcom_smd_remove_device(struct device *dev, void *data) | |
1454 | { | |
1455 | device_unregister(dev); | |
1456 | of_node_put(dev->of_node); | |
1457 | put_device(dev); | |
1458 | ||
1459 | return 0; | |
1460 | } | |
1461 | ||
1462 | /** | |
1463 | * qcom_smd_unregister_edge() - release an edge and its children | |
1464 | * @edge: edge reference acquired from qcom_smd_register_edge | |
1465 | */ | |
1466 | int qcom_smd_unregister_edge(struct qcom_smd_edge *edge) | |
1467 | { | |
1468 | int ret; | |
1469 | ||
1470 | disable_irq(edge->irq); | |
1471 | cancel_work_sync(&edge->scan_work); | |
1472 | cancel_work_sync(&edge->state_work); | |
1473 | ||
1474 | ret = device_for_each_child(&edge->dev, NULL, qcom_smd_remove_device); | |
1475 | if (ret) | |
1476 | dev_warn(&edge->dev, "can't remove smd device: %d\n", ret); | |
1477 | ||
1478 | device_unregister(&edge->dev); | |
1479 | ||
1480 | return 0; | |
1481 | } | |
1482 | EXPORT_SYMBOL(qcom_smd_unregister_edge); | |
1483 | ||
1484 | static int qcom_smd_probe(struct platform_device *pdev) | |
1485 | { | |
1486 | struct device_node *node; | |
1a03964d | 1487 | void *p; |
f2ab3298 BA |
1488 | |
1489 | /* Wait for smem */ | |
1a03964d SB |
1490 | p = qcom_smem_get(QCOM_SMEM_HOST_ANY, smem_items[0].alloc_tbl_id, NULL); |
1491 | if (PTR_ERR(p) == -EPROBE_DEFER) | |
1492 | return PTR_ERR(p); | |
f2ab3298 | 1493 | |
da057302 BA |
1494 | for_each_available_child_of_node(pdev->dev.of_node, node) |
1495 | qcom_smd_register_edge(&pdev->dev, node); | |
f2ab3298 | 1496 | |
da057302 BA |
1497 | return 0; |
1498 | } | |
f2ab3298 | 1499 | |
da057302 BA |
1500 | static int qcom_smd_remove_edge(struct device *dev, void *data) |
1501 | { | |
1502 | struct qcom_smd_edge *edge = to_smd_edge(dev); | |
f2ab3298 | 1503 | |
da057302 | 1504 | return qcom_smd_unregister_edge(edge); |
f2ab3298 BA |
1505 | } |
1506 | ||
1507 | /* | |
1508 | * Shut down all smd clients by making sure that each edge stops processing | |
1509 | * events and scanning for new channels, then call destroy on the devices. | |
1510 | */ | |
1511 | static int qcom_smd_remove(struct platform_device *pdev) | |
1512 | { | |
da057302 | 1513 | int ret; |
f2ab3298 | 1514 | |
da057302 BA |
1515 | ret = device_for_each_child(&pdev->dev, NULL, qcom_smd_remove_edge); |
1516 | if (ret) | |
1517 | dev_warn(&pdev->dev, "can't remove smd device: %d\n", ret); | |
f2ab3298 | 1518 | |
da057302 | 1519 | return ret; |
f2ab3298 BA |
1520 | } |
1521 | ||
1522 | static const struct of_device_id qcom_smd_of_match[] = { | |
1523 | { .compatible = "qcom,smd" }, | |
1524 | {} | |
1525 | }; | |
1526 | MODULE_DEVICE_TABLE(of, qcom_smd_of_match); | |
1527 | ||
1528 | static struct platform_driver qcom_smd_driver = { | |
1529 | .probe = qcom_smd_probe, | |
1530 | .remove = qcom_smd_remove, | |
1531 | .driver = { | |
1532 | .name = "qcom-smd", | |
1533 | .of_match_table = qcom_smd_of_match, | |
1534 | }, | |
1535 | }; | |
1536 | ||
1537 | static int __init qcom_smd_init(void) | |
1538 | { | |
1539 | int ret; | |
1540 | ||
1541 | ret = bus_register(&qcom_smd_bus); | |
1542 | if (ret) { | |
1543 | pr_err("failed to register smd bus: %d\n", ret); | |
1544 | return ret; | |
1545 | } | |
1546 | ||
1547 | return platform_driver_register(&qcom_smd_driver); | |
1548 | } | |
1549 | postcore_initcall(qcom_smd_init); | |
1550 | ||
1551 | static void __exit qcom_smd_exit(void) | |
1552 | { | |
1553 | platform_driver_unregister(&qcom_smd_driver); | |
1554 | bus_unregister(&qcom_smd_bus); | |
1555 | } | |
1556 | module_exit(qcom_smd_exit); | |
1557 | ||
1558 | MODULE_AUTHOR("Bjorn Andersson <bjorn.andersson@sonymobile.com>"); | |
1559 | MODULE_DESCRIPTION("Qualcomm Shared Memory Driver"); | |
1560 | MODULE_LICENSE("GPL v2"); |