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53e2822e 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> | |
ab460a2e | 17 | #include <linux/mailbox_client.h> |
53e2822e BA |
18 | #include <linux/mfd/syscon.h> |
19 | #include <linux/module.h> | |
20 | #include <linux/of_irq.h> | |
21 | #include <linux/of_platform.h> | |
22 | #include <linux/platform_device.h> | |
23 | #include <linux/regmap.h> | |
24 | #include <linux/sched.h> | |
25 | #include <linux/slab.h> | |
26 | #include <linux/soc/qcom/smem.h> | |
27 | #include <linux/wait.h> | |
28 | #include <linux/rpmsg.h> | |
8fc94723 | 29 | #include <linux/rpmsg/qcom_smd.h> |
53e2822e BA |
30 | |
31 | #include "rpmsg_internal.h" | |
32 | ||
33 | /* | |
34 | * The Qualcomm Shared Memory communication solution provides point-to-point | |
35 | * channels for clients to send and receive streaming or packet based data. | |
36 | * | |
37 | * Each channel consists of a control item (channel info) and a ring buffer | |
38 | * pair. The channel info carry information related to channel state, flow | |
39 | * control and the offsets within the ring buffer. | |
40 | * | |
41 | * All allocated channels are listed in an allocation table, identifying the | |
42 | * pair of items by name, type and remote processor. | |
43 | * | |
44 | * Upon creating a new channel the remote processor allocates channel info and | |
45 | * ring buffer items from the smem heap and populate the allocation table. An | |
46 | * interrupt is sent to the other end of the channel and a scan for new | |
47 | * channels should be done. A channel never goes away, it will only change | |
48 | * state. | |
49 | * | |
50 | * The remote processor signals it intent for bring up the communication | |
51 | * channel by setting the state of its end of the channel to "opening" and | |
52 | * sends out an interrupt. We detect this change and register a smd device to | |
53 | * consume the channel. Upon finding a consumer we finish the handshake and the | |
54 | * channel is up. | |
55 | * | |
56 | * Upon closing a channel, the remote processor will update the state of its | |
57 | * end of the channel and signal us, we will then unregister any attached | |
58 | * device and close our end of the channel. | |
59 | * | |
60 | * Devices attached to a channel can use the qcom_smd_send function to push | |
61 | * data to the channel, this is done by copying the data into the tx ring | |
62 | * buffer, updating the pointers in the channel info and signaling the remote | |
63 | * processor. | |
64 | * | |
65 | * The remote processor does the equivalent when it transfer data and upon | |
66 | * receiving the interrupt we check the channel info for new data and delivers | |
67 | * this to the attached device. If the device is not ready to receive the data | |
68 | * we leave it in the ring buffer for now. | |
69 | */ | |
70 | ||
71 | struct smd_channel_info; | |
72 | struct smd_channel_info_pair; | |
73 | struct smd_channel_info_word; | |
74 | struct smd_channel_info_word_pair; | |
75 | ||
76 | static const struct rpmsg_endpoint_ops qcom_smd_endpoint_ops; | |
77 | ||
78 | #define SMD_ALLOC_TBL_COUNT 2 | |
79 | #define SMD_ALLOC_TBL_SIZE 64 | |
80 | ||
81 | /* | |
82 | * This lists the various smem heap items relevant for the allocation table and | |
83 | * smd channel entries. | |
84 | */ | |
85 | static const struct { | |
86 | unsigned alloc_tbl_id; | |
87 | unsigned info_base_id; | |
88 | unsigned fifo_base_id; | |
89 | } smem_items[SMD_ALLOC_TBL_COUNT] = { | |
90 | { | |
91 | .alloc_tbl_id = 13, | |
92 | .info_base_id = 14, | |
93 | .fifo_base_id = 338 | |
94 | }, | |
95 | { | |
96 | .alloc_tbl_id = 266, | |
97 | .info_base_id = 138, | |
98 | .fifo_base_id = 202, | |
99 | }, | |
100 | }; | |
101 | ||
102 | /** | |
103 | * struct qcom_smd_edge - representing a remote processor | |
104 | * @of_node: of_node handle for information related to this edge | |
105 | * @edge_id: identifier of this edge | |
106 | * @remote_pid: identifier of remote processor | |
107 | * @irq: interrupt for signals on this edge | |
108 | * @ipc_regmap: regmap handle holding the outgoing ipc register | |
109 | * @ipc_offset: offset within @ipc_regmap of the register for ipc | |
110 | * @ipc_bit: bit in the register at @ipc_offset of @ipc_regmap | |
ab460a2e BA |
111 | * @mbox_client: mailbox client handle |
112 | * @mbox_chan: apcs ipc mailbox channel handle | |
53e2822e BA |
113 | * @channels: list of all channels detected on this edge |
114 | * @channels_lock: guard for modifications of @channels | |
115 | * @allocated: array of bitmaps representing already allocated channels | |
116 | * @smem_available: last available amount of smem triggering a channel scan | |
117 | * @scan_work: work item for discovering new channels | |
118 | * @state_work: work item for edge state changes | |
119 | */ | |
120 | struct qcom_smd_edge { | |
121 | struct device dev; | |
122 | ||
5e53c42c BA |
123 | const char *name; |
124 | ||
53e2822e BA |
125 | struct device_node *of_node; |
126 | unsigned edge_id; | |
127 | unsigned remote_pid; | |
128 | ||
129 | int irq; | |
130 | ||
131 | struct regmap *ipc_regmap; | |
132 | int ipc_offset; | |
133 | int ipc_bit; | |
134 | ||
ab460a2e BA |
135 | struct mbox_client mbox_client; |
136 | struct mbox_chan *mbox_chan; | |
137 | ||
53e2822e BA |
138 | struct list_head channels; |
139 | spinlock_t channels_lock; | |
140 | ||
141 | DECLARE_BITMAP(allocated[SMD_ALLOC_TBL_COUNT], SMD_ALLOC_TBL_SIZE); | |
142 | ||
143 | unsigned smem_available; | |
144 | ||
145 | wait_queue_head_t new_channel_event; | |
146 | ||
147 | struct work_struct scan_work; | |
148 | struct work_struct state_work; | |
149 | }; | |
150 | ||
151 | /* | |
152 | * SMD channel states. | |
153 | */ | |
154 | enum smd_channel_state { | |
155 | SMD_CHANNEL_CLOSED, | |
156 | SMD_CHANNEL_OPENING, | |
157 | SMD_CHANNEL_OPENED, | |
158 | SMD_CHANNEL_FLUSHING, | |
159 | SMD_CHANNEL_CLOSING, | |
160 | SMD_CHANNEL_RESET, | |
161 | SMD_CHANNEL_RESET_OPENING | |
162 | }; | |
163 | ||
164 | struct qcom_smd_device { | |
165 | struct rpmsg_device rpdev; | |
166 | ||
167 | struct qcom_smd_edge *edge; | |
168 | }; | |
169 | ||
170 | struct qcom_smd_endpoint { | |
171 | struct rpmsg_endpoint ept; | |
172 | ||
173 | struct qcom_smd_channel *qsch; | |
174 | }; | |
175 | ||
6ddf12d3 | 176 | #define to_smd_device(r) container_of(r, struct qcom_smd_device, rpdev) |
53e2822e | 177 | #define to_smd_edge(d) container_of(d, struct qcom_smd_edge, dev) |
6ddf12d3 | 178 | #define to_smd_endpoint(e) container_of(e, struct qcom_smd_endpoint, ept) |
53e2822e BA |
179 | |
180 | /** | |
181 | * struct qcom_smd_channel - smd channel struct | |
182 | * @edge: qcom_smd_edge this channel is living on | |
183 | * @qsdev: reference to a associated smd client device | |
184 | * @name: name of the channel | |
185 | * @state: local state of the channel | |
186 | * @remote_state: remote state of the channel | |
187 | * @info: byte aligned outgoing/incoming channel info | |
188 | * @info_word: word aligned outgoing/incoming channel info | |
189 | * @tx_lock: lock to make writes to the channel mutually exclusive | |
190 | * @fblockread_event: wakeup event tied to tx fBLOCKREADINTR | |
191 | * @tx_fifo: pointer to the outgoing ring buffer | |
192 | * @rx_fifo: pointer to the incoming ring buffer | |
193 | * @fifo_size: size of each ring buffer | |
194 | * @bounce_buffer: bounce buffer for reading wrapped packets | |
195 | * @cb: callback function registered for this channel | |
196 | * @recv_lock: guard for rx info modifications and cb pointer | |
197 | * @pkt_size: size of the currently handled packet | |
198 | * @list: lite entry for @channels in qcom_smd_edge | |
199 | */ | |
200 | struct qcom_smd_channel { | |
201 | struct qcom_smd_edge *edge; | |
202 | ||
203 | struct qcom_smd_endpoint *qsept; | |
204 | bool registered; | |
205 | ||
206 | char *name; | |
207 | enum smd_channel_state state; | |
208 | enum smd_channel_state remote_state; | |
268105fb | 209 | wait_queue_head_t state_change_event; |
53e2822e BA |
210 | |
211 | struct smd_channel_info_pair *info; | |
212 | struct smd_channel_info_word_pair *info_word; | |
213 | ||
33e3820d | 214 | spinlock_t tx_lock; |
53e2822e BA |
215 | wait_queue_head_t fblockread_event; |
216 | ||
217 | void *tx_fifo; | |
218 | void *rx_fifo; | |
219 | int fifo_size; | |
220 | ||
221 | void *bounce_buffer; | |
222 | ||
223 | spinlock_t recv_lock; | |
224 | ||
225 | int pkt_size; | |
226 | ||
227 | void *drvdata; | |
228 | ||
229 | struct list_head list; | |
230 | }; | |
231 | ||
232 | /* | |
233 | * Format of the smd_info smem items, for byte aligned channels. | |
234 | */ | |
235 | struct smd_channel_info { | |
236 | __le32 state; | |
237 | u8 fDSR; | |
238 | u8 fCTS; | |
239 | u8 fCD; | |
240 | u8 fRI; | |
241 | u8 fHEAD; | |
242 | u8 fTAIL; | |
243 | u8 fSTATE; | |
244 | u8 fBLOCKREADINTR; | |
245 | __le32 tail; | |
246 | __le32 head; | |
247 | }; | |
248 | ||
249 | struct smd_channel_info_pair { | |
250 | struct smd_channel_info tx; | |
251 | struct smd_channel_info rx; | |
252 | }; | |
253 | ||
254 | /* | |
255 | * Format of the smd_info smem items, for word aligned channels. | |
256 | */ | |
257 | struct smd_channel_info_word { | |
258 | __le32 state; | |
259 | __le32 fDSR; | |
260 | __le32 fCTS; | |
261 | __le32 fCD; | |
262 | __le32 fRI; | |
263 | __le32 fHEAD; | |
264 | __le32 fTAIL; | |
265 | __le32 fSTATE; | |
266 | __le32 fBLOCKREADINTR; | |
267 | __le32 tail; | |
268 | __le32 head; | |
269 | }; | |
270 | ||
271 | struct smd_channel_info_word_pair { | |
272 | struct smd_channel_info_word tx; | |
273 | struct smd_channel_info_word rx; | |
274 | }; | |
275 | ||
276 | #define GET_RX_CHANNEL_FLAG(channel, param) \ | |
277 | ({ \ | |
278 | BUILD_BUG_ON(sizeof(channel->info->rx.param) != sizeof(u8)); \ | |
279 | channel->info_word ? \ | |
280 | le32_to_cpu(channel->info_word->rx.param) : \ | |
281 | channel->info->rx.param; \ | |
282 | }) | |
283 | ||
284 | #define GET_RX_CHANNEL_INFO(channel, param) \ | |
285 | ({ \ | |
286 | BUILD_BUG_ON(sizeof(channel->info->rx.param) != sizeof(u32)); \ | |
287 | le32_to_cpu(channel->info_word ? \ | |
288 | channel->info_word->rx.param : \ | |
289 | channel->info->rx.param); \ | |
290 | }) | |
291 | ||
292 | #define SET_RX_CHANNEL_FLAG(channel, param, value) \ | |
293 | ({ \ | |
294 | BUILD_BUG_ON(sizeof(channel->info->rx.param) != sizeof(u8)); \ | |
295 | if (channel->info_word) \ | |
296 | channel->info_word->rx.param = cpu_to_le32(value); \ | |
297 | else \ | |
298 | channel->info->rx.param = value; \ | |
299 | }) | |
300 | ||
301 | #define SET_RX_CHANNEL_INFO(channel, param, value) \ | |
302 | ({ \ | |
303 | BUILD_BUG_ON(sizeof(channel->info->rx.param) != sizeof(u32)); \ | |
304 | if (channel->info_word) \ | |
305 | channel->info_word->rx.param = cpu_to_le32(value); \ | |
306 | else \ | |
307 | channel->info->rx.param = cpu_to_le32(value); \ | |
308 | }) | |
309 | ||
310 | #define GET_TX_CHANNEL_FLAG(channel, param) \ | |
311 | ({ \ | |
312 | BUILD_BUG_ON(sizeof(channel->info->tx.param) != sizeof(u8)); \ | |
313 | channel->info_word ? \ | |
314 | le32_to_cpu(channel->info_word->tx.param) : \ | |
315 | channel->info->tx.param; \ | |
316 | }) | |
317 | ||
318 | #define GET_TX_CHANNEL_INFO(channel, param) \ | |
319 | ({ \ | |
320 | BUILD_BUG_ON(sizeof(channel->info->tx.param) != sizeof(u32)); \ | |
321 | le32_to_cpu(channel->info_word ? \ | |
322 | channel->info_word->tx.param : \ | |
323 | channel->info->tx.param); \ | |
324 | }) | |
325 | ||
326 | #define SET_TX_CHANNEL_FLAG(channel, param, value) \ | |
327 | ({ \ | |
328 | BUILD_BUG_ON(sizeof(channel->info->tx.param) != sizeof(u8)); \ | |
329 | if (channel->info_word) \ | |
330 | channel->info_word->tx.param = cpu_to_le32(value); \ | |
331 | else \ | |
332 | channel->info->tx.param = value; \ | |
333 | }) | |
334 | ||
335 | #define SET_TX_CHANNEL_INFO(channel, param, value) \ | |
336 | ({ \ | |
337 | BUILD_BUG_ON(sizeof(channel->info->tx.param) != sizeof(u32)); \ | |
338 | if (channel->info_word) \ | |
339 | channel->info_word->tx.param = cpu_to_le32(value); \ | |
340 | else \ | |
341 | channel->info->tx.param = cpu_to_le32(value); \ | |
342 | }) | |
343 | ||
344 | /** | |
345 | * struct qcom_smd_alloc_entry - channel allocation entry | |
346 | * @name: channel name | |
347 | * @cid: channel index | |
348 | * @flags: channel flags and edge id | |
349 | * @ref_count: reference count of the channel | |
350 | */ | |
351 | struct qcom_smd_alloc_entry { | |
352 | u8 name[20]; | |
353 | __le32 cid; | |
354 | __le32 flags; | |
355 | __le32 ref_count; | |
356 | } __packed; | |
357 | ||
358 | #define SMD_CHANNEL_FLAGS_EDGE_MASK 0xff | |
359 | #define SMD_CHANNEL_FLAGS_STREAM BIT(8) | |
360 | #define SMD_CHANNEL_FLAGS_PACKET BIT(9) | |
361 | ||
362 | /* | |
363 | * Each smd packet contains a 20 byte header, with the first 4 being the length | |
364 | * of the packet. | |
365 | */ | |
366 | #define SMD_PACKET_HEADER_LEN 20 | |
367 | ||
368 | /* | |
369 | * Signal the remote processor associated with 'channel'. | |
370 | */ | |
371 | static void qcom_smd_signal_channel(struct qcom_smd_channel *channel) | |
372 | { | |
373 | struct qcom_smd_edge *edge = channel->edge; | |
374 | ||
ab460a2e BA |
375 | if (edge->mbox_chan) { |
376 | /* | |
377 | * We can ignore a failing mbox_send_message() as the only | |
378 | * possible cause is that the FIFO in the framework is full of | |
379 | * other writes to the same bit. | |
380 | */ | |
381 | mbox_send_message(edge->mbox_chan, NULL); | |
382 | mbox_client_txdone(edge->mbox_chan, 0); | |
383 | } else { | |
384 | regmap_write(edge->ipc_regmap, edge->ipc_offset, BIT(edge->ipc_bit)); | |
385 | } | |
53e2822e BA |
386 | } |
387 | ||
388 | /* | |
389 | * Initialize the tx channel info | |
390 | */ | |
391 | static void qcom_smd_channel_reset(struct qcom_smd_channel *channel) | |
392 | { | |
393 | SET_TX_CHANNEL_INFO(channel, state, SMD_CHANNEL_CLOSED); | |
394 | SET_TX_CHANNEL_FLAG(channel, fDSR, 0); | |
395 | SET_TX_CHANNEL_FLAG(channel, fCTS, 0); | |
396 | SET_TX_CHANNEL_FLAG(channel, fCD, 0); | |
397 | SET_TX_CHANNEL_FLAG(channel, fRI, 0); | |
398 | SET_TX_CHANNEL_FLAG(channel, fHEAD, 0); | |
399 | SET_TX_CHANNEL_FLAG(channel, fTAIL, 0); | |
400 | SET_TX_CHANNEL_FLAG(channel, fSTATE, 1); | |
401 | SET_TX_CHANNEL_FLAG(channel, fBLOCKREADINTR, 1); | |
402 | SET_TX_CHANNEL_INFO(channel, head, 0); | |
403 | SET_RX_CHANNEL_INFO(channel, tail, 0); | |
404 | ||
405 | qcom_smd_signal_channel(channel); | |
406 | ||
407 | channel->state = SMD_CHANNEL_CLOSED; | |
408 | channel->pkt_size = 0; | |
409 | } | |
410 | ||
411 | /* | |
412 | * Set the callback for a channel, with appropriate locking | |
413 | */ | |
414 | static void qcom_smd_channel_set_callback(struct qcom_smd_channel *channel, | |
415 | rpmsg_rx_cb_t cb) | |
416 | { | |
417 | struct rpmsg_endpoint *ept = &channel->qsept->ept; | |
418 | unsigned long flags; | |
419 | ||
420 | spin_lock_irqsave(&channel->recv_lock, flags); | |
421 | ept->cb = cb; | |
422 | spin_unlock_irqrestore(&channel->recv_lock, flags); | |
423 | }; | |
424 | ||
425 | /* | |
426 | * Calculate the amount of data available in the rx fifo | |
427 | */ | |
428 | static size_t qcom_smd_channel_get_rx_avail(struct qcom_smd_channel *channel) | |
429 | { | |
430 | unsigned head; | |
431 | unsigned tail; | |
432 | ||
433 | head = GET_RX_CHANNEL_INFO(channel, head); | |
434 | tail = GET_RX_CHANNEL_INFO(channel, tail); | |
435 | ||
436 | return (head - tail) & (channel->fifo_size - 1); | |
437 | } | |
438 | ||
439 | /* | |
440 | * Set tx channel state and inform the remote processor | |
441 | */ | |
442 | static void qcom_smd_channel_set_state(struct qcom_smd_channel *channel, | |
443 | int state) | |
444 | { | |
445 | struct qcom_smd_edge *edge = channel->edge; | |
446 | bool is_open = state == SMD_CHANNEL_OPENED; | |
447 | ||
448 | if (channel->state == state) | |
449 | return; | |
450 | ||
451 | dev_dbg(&edge->dev, "set_state(%s, %d)\n", channel->name, state); | |
452 | ||
453 | SET_TX_CHANNEL_FLAG(channel, fDSR, is_open); | |
454 | SET_TX_CHANNEL_FLAG(channel, fCTS, is_open); | |
455 | SET_TX_CHANNEL_FLAG(channel, fCD, is_open); | |
456 | ||
457 | SET_TX_CHANNEL_INFO(channel, state, state); | |
458 | SET_TX_CHANNEL_FLAG(channel, fSTATE, 1); | |
459 | ||
460 | channel->state = state; | |
461 | qcom_smd_signal_channel(channel); | |
462 | } | |
463 | ||
464 | /* | |
465 | * Copy count bytes of data using 32bit accesses, if that's required. | |
466 | */ | |
467 | static void smd_copy_to_fifo(void __iomem *dst, | |
468 | const void *src, | |
469 | size_t count, | |
470 | bool word_aligned) | |
471 | { | |
472 | if (word_aligned) { | |
473 | __iowrite32_copy(dst, src, count / sizeof(u32)); | |
474 | } else { | |
475 | memcpy_toio(dst, src, count); | |
476 | } | |
477 | } | |
478 | ||
479 | /* | |
480 | * Copy count bytes of data using 32bit accesses, if that is required. | |
481 | */ | |
482 | static void smd_copy_from_fifo(void *dst, | |
483 | const void __iomem *src, | |
484 | size_t count, | |
485 | bool word_aligned) | |
486 | { | |
487 | if (word_aligned) { | |
488 | __ioread32_copy(dst, src, count / sizeof(u32)); | |
489 | } else { | |
490 | memcpy_fromio(dst, src, count); | |
491 | } | |
492 | } | |
493 | ||
494 | /* | |
495 | * Read count bytes of data from the rx fifo into buf, but don't advance the | |
496 | * tail. | |
497 | */ | |
498 | static size_t qcom_smd_channel_peek(struct qcom_smd_channel *channel, | |
499 | void *buf, size_t count) | |
500 | { | |
501 | bool word_aligned; | |
502 | unsigned tail; | |
503 | size_t len; | |
504 | ||
505 | word_aligned = channel->info_word; | |
506 | tail = GET_RX_CHANNEL_INFO(channel, tail); | |
507 | ||
508 | len = min_t(size_t, count, channel->fifo_size - tail); | |
509 | if (len) { | |
510 | smd_copy_from_fifo(buf, | |
511 | channel->rx_fifo + tail, | |
512 | len, | |
513 | word_aligned); | |
514 | } | |
515 | ||
516 | if (len != count) { | |
517 | smd_copy_from_fifo(buf + len, | |
518 | channel->rx_fifo, | |
519 | count - len, | |
520 | word_aligned); | |
521 | } | |
522 | ||
523 | return count; | |
524 | } | |
525 | ||
526 | /* | |
527 | * Advance the rx tail by count bytes. | |
528 | */ | |
529 | static void qcom_smd_channel_advance(struct qcom_smd_channel *channel, | |
530 | size_t count) | |
531 | { | |
532 | unsigned tail; | |
533 | ||
534 | tail = GET_RX_CHANNEL_INFO(channel, tail); | |
535 | tail += count; | |
536 | tail &= (channel->fifo_size - 1); | |
537 | SET_RX_CHANNEL_INFO(channel, tail, tail); | |
538 | } | |
539 | ||
540 | /* | |
541 | * Read out a single packet from the rx fifo and deliver it to the device | |
542 | */ | |
543 | static int qcom_smd_channel_recv_single(struct qcom_smd_channel *channel) | |
544 | { | |
545 | struct rpmsg_endpoint *ept = &channel->qsept->ept; | |
546 | unsigned tail; | |
547 | size_t len; | |
548 | void *ptr; | |
549 | int ret; | |
550 | ||
551 | tail = GET_RX_CHANNEL_INFO(channel, tail); | |
552 | ||
553 | /* Use bounce buffer if the data wraps */ | |
554 | if (tail + channel->pkt_size >= channel->fifo_size) { | |
555 | ptr = channel->bounce_buffer; | |
556 | len = qcom_smd_channel_peek(channel, ptr, channel->pkt_size); | |
557 | } else { | |
558 | ptr = channel->rx_fifo + tail; | |
559 | len = channel->pkt_size; | |
560 | } | |
561 | ||
562 | ret = ept->cb(ept->rpdev, ptr, len, ept->priv, RPMSG_ADDR_ANY); | |
563 | if (ret < 0) | |
564 | return ret; | |
565 | ||
566 | /* Only forward the tail if the client consumed the data */ | |
567 | qcom_smd_channel_advance(channel, len); | |
568 | ||
569 | channel->pkt_size = 0; | |
570 | ||
571 | return 0; | |
572 | } | |
573 | ||
574 | /* | |
575 | * Per channel interrupt handling | |
576 | */ | |
577 | static bool qcom_smd_channel_intr(struct qcom_smd_channel *channel) | |
578 | { | |
579 | bool need_state_scan = false; | |
580 | int remote_state; | |
581 | __le32 pktlen; | |
582 | int avail; | |
583 | int ret; | |
584 | ||
585 | /* Handle state changes */ | |
586 | remote_state = GET_RX_CHANNEL_INFO(channel, state); | |
587 | if (remote_state != channel->remote_state) { | |
588 | channel->remote_state = remote_state; | |
589 | need_state_scan = true; | |
268105fb BA |
590 | |
591 | wake_up_interruptible_all(&channel->state_change_event); | |
53e2822e BA |
592 | } |
593 | /* Indicate that we have seen any state change */ | |
594 | SET_RX_CHANNEL_FLAG(channel, fSTATE, 0); | |
595 | ||
596 | /* Signal waiting qcom_smd_send() about the interrupt */ | |
597 | if (!GET_TX_CHANNEL_FLAG(channel, fBLOCKREADINTR)) | |
eb114f27 | 598 | wake_up_interruptible_all(&channel->fblockread_event); |
53e2822e BA |
599 | |
600 | /* Don't consume any data until we've opened the channel */ | |
601 | if (channel->state != SMD_CHANNEL_OPENED) | |
602 | goto out; | |
603 | ||
604 | /* Indicate that we've seen the new data */ | |
605 | SET_RX_CHANNEL_FLAG(channel, fHEAD, 0); | |
606 | ||
607 | /* Consume data */ | |
608 | for (;;) { | |
609 | avail = qcom_smd_channel_get_rx_avail(channel); | |
610 | ||
611 | if (!channel->pkt_size && avail >= SMD_PACKET_HEADER_LEN) { | |
612 | qcom_smd_channel_peek(channel, &pktlen, sizeof(pktlen)); | |
613 | qcom_smd_channel_advance(channel, SMD_PACKET_HEADER_LEN); | |
614 | channel->pkt_size = le32_to_cpu(pktlen); | |
615 | } else if (channel->pkt_size && avail >= channel->pkt_size) { | |
616 | ret = qcom_smd_channel_recv_single(channel); | |
617 | if (ret) | |
618 | break; | |
619 | } else { | |
620 | break; | |
621 | } | |
622 | } | |
623 | ||
624 | /* Indicate that we have seen and updated tail */ | |
625 | SET_RX_CHANNEL_FLAG(channel, fTAIL, 1); | |
626 | ||
627 | /* Signal the remote that we've consumed the data (if requested) */ | |
628 | if (!GET_RX_CHANNEL_FLAG(channel, fBLOCKREADINTR)) { | |
629 | /* Ensure ordering of channel info updates */ | |
630 | wmb(); | |
631 | ||
632 | qcom_smd_signal_channel(channel); | |
633 | } | |
634 | ||
635 | out: | |
636 | return need_state_scan; | |
637 | } | |
638 | ||
639 | /* | |
640 | * The edge interrupts are triggered by the remote processor on state changes, | |
641 | * channel info updates or when new channels are created. | |
642 | */ | |
643 | static irqreturn_t qcom_smd_edge_intr(int irq, void *data) | |
644 | { | |
645 | struct qcom_smd_edge *edge = data; | |
646 | struct qcom_smd_channel *channel; | |
647 | unsigned available; | |
648 | bool kick_scanner = false; | |
649 | bool kick_state = false; | |
650 | ||
651 | /* | |
652 | * Handle state changes or data on each of the channels on this edge | |
653 | */ | |
654 | spin_lock(&edge->channels_lock); | |
655 | list_for_each_entry(channel, &edge->channels, list) { | |
656 | spin_lock(&channel->recv_lock); | |
657 | kick_state |= qcom_smd_channel_intr(channel); | |
658 | spin_unlock(&channel->recv_lock); | |
659 | } | |
660 | spin_unlock(&edge->channels_lock); | |
661 | ||
662 | /* | |
663 | * Creating a new channel requires allocating an smem entry, so we only | |
664 | * have to scan if the amount of available space in smem have changed | |
665 | * since last scan. | |
666 | */ | |
667 | available = qcom_smem_get_free_space(edge->remote_pid); | |
668 | if (available != edge->smem_available) { | |
669 | edge->smem_available = available; | |
670 | kick_scanner = true; | |
671 | } | |
672 | ||
673 | if (kick_scanner) | |
674 | schedule_work(&edge->scan_work); | |
675 | if (kick_state) | |
676 | schedule_work(&edge->state_work); | |
677 | ||
678 | return IRQ_HANDLED; | |
679 | } | |
680 | ||
681 | /* | |
682 | * Calculate how much space is available in the tx fifo. | |
683 | */ | |
684 | static size_t qcom_smd_get_tx_avail(struct qcom_smd_channel *channel) | |
685 | { | |
686 | unsigned head; | |
687 | unsigned tail; | |
688 | unsigned mask = channel->fifo_size - 1; | |
689 | ||
690 | head = GET_TX_CHANNEL_INFO(channel, head); | |
691 | tail = GET_TX_CHANNEL_INFO(channel, tail); | |
692 | ||
693 | return mask - ((head - tail) & mask); | |
694 | } | |
695 | ||
696 | /* | |
697 | * Write count bytes of data into channel, possibly wrapping in the ring buffer | |
698 | */ | |
699 | static int qcom_smd_write_fifo(struct qcom_smd_channel *channel, | |
700 | const void *data, | |
701 | size_t count) | |
702 | { | |
703 | bool word_aligned; | |
704 | unsigned head; | |
705 | size_t len; | |
706 | ||
707 | word_aligned = channel->info_word; | |
708 | head = GET_TX_CHANNEL_INFO(channel, head); | |
709 | ||
710 | len = min_t(size_t, count, channel->fifo_size - head); | |
711 | if (len) { | |
712 | smd_copy_to_fifo(channel->tx_fifo + head, | |
713 | data, | |
714 | len, | |
715 | word_aligned); | |
716 | } | |
717 | ||
718 | if (len != count) { | |
719 | smd_copy_to_fifo(channel->tx_fifo, | |
720 | data + len, | |
721 | count - len, | |
722 | word_aligned); | |
723 | } | |
724 | ||
725 | head += count; | |
726 | head &= (channel->fifo_size - 1); | |
727 | SET_TX_CHANNEL_INFO(channel, head, head); | |
728 | ||
729 | return count; | |
730 | } | |
731 | ||
732 | /** | |
733 | * qcom_smd_send - write data to smd channel | |
734 | * @channel: channel handle | |
735 | * @data: buffer of data to write | |
736 | * @len: number of bytes to write | |
737 | * | |
738 | * This is a blocking write of len bytes into the channel's tx ring buffer and | |
739 | * signal the remote end. It will sleep until there is enough space available | |
740 | * in the tx buffer, utilizing the fBLOCKREADINTR signaling mechanism to avoid | |
741 | * polling. | |
742 | */ | |
743 | static int __qcom_smd_send(struct qcom_smd_channel *channel, const void *data, | |
744 | int len, bool wait) | |
745 | { | |
746 | __le32 hdr[5] = { cpu_to_le32(len), }; | |
747 | int tlen = sizeof(hdr) + len; | |
33e3820d | 748 | unsigned long flags; |
53e2822e BA |
749 | int ret; |
750 | ||
751 | /* Word aligned channels only accept word size aligned data */ | |
752 | if (channel->info_word && len % 4) | |
753 | return -EINVAL; | |
754 | ||
755 | /* Reject packets that are too big */ | |
756 | if (tlen >= channel->fifo_size) | |
757 | return -EINVAL; | |
758 | ||
33e3820d BA |
759 | /* Highlight the fact that if we enter the loop below we might sleep */ |
760 | if (wait) | |
761 | might_sleep(); | |
762 | ||
763 | spin_lock_irqsave(&channel->tx_lock, flags); | |
53e2822e | 764 | |
b2c932e7 BA |
765 | while (qcom_smd_get_tx_avail(channel) < tlen && |
766 | channel->state == SMD_CHANNEL_OPENED) { | |
53e2822e | 767 | if (!wait) { |
1d74e7ed | 768 | ret = -EAGAIN; |
c3388a07 | 769 | goto out_unlock; |
53e2822e BA |
770 | } |
771 | ||
772 | SET_TX_CHANNEL_FLAG(channel, fBLOCKREADINTR, 0); | |
773 | ||
178f3f75 | 774 | /* Wait without holding the tx_lock */ |
33e3820d | 775 | spin_unlock_irqrestore(&channel->tx_lock, flags); |
178f3f75 | 776 | |
53e2822e BA |
777 | ret = wait_event_interruptible(channel->fblockread_event, |
778 | qcom_smd_get_tx_avail(channel) >= tlen || | |
779 | channel->state != SMD_CHANNEL_OPENED); | |
780 | if (ret) | |
c3388a07 | 781 | return ret; |
53e2822e | 782 | |
33e3820d | 783 | spin_lock_irqsave(&channel->tx_lock, flags); |
53e2822e BA |
784 | |
785 | SET_TX_CHANNEL_FLAG(channel, fBLOCKREADINTR, 1); | |
786 | } | |
787 | ||
b2c932e7 BA |
788 | /* Fail if the channel was closed */ |
789 | if (channel->state != SMD_CHANNEL_OPENED) { | |
790 | ret = -EPIPE; | |
c3388a07 | 791 | goto out_unlock; |
b2c932e7 BA |
792 | } |
793 | ||
53e2822e BA |
794 | SET_TX_CHANNEL_FLAG(channel, fTAIL, 0); |
795 | ||
796 | qcom_smd_write_fifo(channel, hdr, sizeof(hdr)); | |
797 | qcom_smd_write_fifo(channel, data, len); | |
798 | ||
799 | SET_TX_CHANNEL_FLAG(channel, fHEAD, 1); | |
800 | ||
801 | /* Ensure ordering of channel info updates */ | |
802 | wmb(); | |
803 | ||
804 | qcom_smd_signal_channel(channel); | |
805 | ||
c3388a07 | 806 | out_unlock: |
33e3820d | 807 | spin_unlock_irqrestore(&channel->tx_lock, flags); |
53e2822e BA |
808 | |
809 | return ret; | |
810 | } | |
811 | ||
812 | /* | |
813 | * Helper for opening a channel | |
814 | */ | |
815 | static int qcom_smd_channel_open(struct qcom_smd_channel *channel, | |
816 | rpmsg_rx_cb_t cb) | |
817 | { | |
268105fb | 818 | struct qcom_smd_edge *edge = channel->edge; |
53e2822e | 819 | size_t bb_size; |
268105fb | 820 | int ret; |
53e2822e BA |
821 | |
822 | /* | |
823 | * Packets are maximum 4k, but reduce if the fifo is smaller | |
824 | */ | |
825 | bb_size = min(channel->fifo_size, SZ_4K); | |
826 | channel->bounce_buffer = kmalloc(bb_size, GFP_KERNEL); | |
827 | if (!channel->bounce_buffer) | |
828 | return -ENOMEM; | |
829 | ||
830 | qcom_smd_channel_set_callback(channel, cb); | |
831 | qcom_smd_channel_set_state(channel, SMD_CHANNEL_OPENING); | |
268105fb BA |
832 | |
833 | /* Wait for remote to enter opening or opened */ | |
834 | ret = wait_event_interruptible_timeout(channel->state_change_event, | |
835 | channel->remote_state == SMD_CHANNEL_OPENING || | |
836 | channel->remote_state == SMD_CHANNEL_OPENED, | |
837 | HZ); | |
838 | if (!ret) { | |
839 | dev_err(&edge->dev, "remote side did not enter opening state\n"); | |
840 | goto out_close_timeout; | |
841 | } | |
842 | ||
53e2822e BA |
843 | qcom_smd_channel_set_state(channel, SMD_CHANNEL_OPENED); |
844 | ||
268105fb BA |
845 | /* Wait for remote to enter opened */ |
846 | ret = wait_event_interruptible_timeout(channel->state_change_event, | |
847 | channel->remote_state == SMD_CHANNEL_OPENED, | |
848 | HZ); | |
849 | if (!ret) { | |
850 | dev_err(&edge->dev, "remote side did not enter open state\n"); | |
851 | goto out_close_timeout; | |
852 | } | |
853 | ||
53e2822e | 854 | return 0; |
268105fb BA |
855 | |
856 | out_close_timeout: | |
857 | qcom_smd_channel_set_state(channel, SMD_CHANNEL_CLOSED); | |
858 | return -ETIMEDOUT; | |
53e2822e BA |
859 | } |
860 | ||
861 | /* | |
862 | * Helper for closing and resetting a channel | |
863 | */ | |
864 | static void qcom_smd_channel_close(struct qcom_smd_channel *channel) | |
865 | { | |
866 | qcom_smd_channel_set_callback(channel, NULL); | |
867 | ||
868 | kfree(channel->bounce_buffer); | |
869 | channel->bounce_buffer = NULL; | |
870 | ||
871 | qcom_smd_channel_set_state(channel, SMD_CHANNEL_CLOSED); | |
872 | qcom_smd_channel_reset(channel); | |
873 | } | |
874 | ||
875 | static struct qcom_smd_channel * | |
876 | qcom_smd_find_channel(struct qcom_smd_edge *edge, const char *name) | |
877 | { | |
878 | struct qcom_smd_channel *channel; | |
879 | struct qcom_smd_channel *ret = NULL; | |
880 | unsigned long flags; | |
53e2822e BA |
881 | |
882 | spin_lock_irqsave(&edge->channels_lock, flags); | |
883 | list_for_each_entry(channel, &edge->channels, list) { | |
66dca399 BA |
884 | if (!strcmp(channel->name, name)) { |
885 | ret = channel; | |
886 | break; | |
887 | } | |
53e2822e BA |
888 | } |
889 | spin_unlock_irqrestore(&edge->channels_lock, flags); | |
890 | ||
891 | return ret; | |
892 | } | |
893 | ||
894 | static void __ept_release(struct kref *kref) | |
895 | { | |
896 | struct rpmsg_endpoint *ept = container_of(kref, struct rpmsg_endpoint, | |
897 | refcount); | |
898 | kfree(to_smd_endpoint(ept)); | |
899 | } | |
900 | ||
901 | static struct rpmsg_endpoint *qcom_smd_create_ept(struct rpmsg_device *rpdev, | |
902 | rpmsg_rx_cb_t cb, void *priv, | |
903 | struct rpmsg_channel_info chinfo) | |
904 | { | |
905 | struct qcom_smd_endpoint *qsept; | |
906 | struct qcom_smd_channel *channel; | |
907 | struct qcom_smd_device *qsdev = to_smd_device(rpdev); | |
908 | struct qcom_smd_edge *edge = qsdev->edge; | |
909 | struct rpmsg_endpoint *ept; | |
910 | const char *name = chinfo.name; | |
911 | int ret; | |
912 | ||
913 | /* Wait up to HZ for the channel to appear */ | |
914 | ret = wait_event_interruptible_timeout(edge->new_channel_event, | |
915 | (channel = qcom_smd_find_channel(edge, name)) != NULL, | |
916 | HZ); | |
917 | if (!ret) | |
918 | return NULL; | |
919 | ||
920 | if (channel->state != SMD_CHANNEL_CLOSED) { | |
921 | dev_err(&rpdev->dev, "channel %s is busy\n", channel->name); | |
922 | return NULL; | |
923 | } | |
924 | ||
925 | qsept = kzalloc(sizeof(*qsept), GFP_KERNEL); | |
926 | if (!qsept) | |
927 | return NULL; | |
928 | ||
929 | ept = &qsept->ept; | |
930 | ||
931 | kref_init(&ept->refcount); | |
932 | ||
933 | ept->rpdev = rpdev; | |
934 | ept->cb = cb; | |
935 | ept->priv = priv; | |
936 | ept->ops = &qcom_smd_endpoint_ops; | |
937 | ||
938 | channel->qsept = qsept; | |
939 | qsept->qsch = channel; | |
940 | ||
941 | ret = qcom_smd_channel_open(channel, cb); | |
942 | if (ret) | |
943 | goto free_ept; | |
944 | ||
945 | return ept; | |
946 | ||
947 | free_ept: | |
948 | channel->qsept = NULL; | |
949 | kref_put(&ept->refcount, __ept_release); | |
950 | return NULL; | |
951 | } | |
952 | ||
953 | static void qcom_smd_destroy_ept(struct rpmsg_endpoint *ept) | |
954 | { | |
955 | struct qcom_smd_endpoint *qsept = to_smd_endpoint(ept); | |
956 | struct qcom_smd_channel *ch = qsept->qsch; | |
957 | ||
958 | qcom_smd_channel_close(ch); | |
959 | ch->qsept = NULL; | |
960 | kref_put(&ept->refcount, __ept_release); | |
961 | } | |
962 | ||
963 | static int qcom_smd_send(struct rpmsg_endpoint *ept, void *data, int len) | |
964 | { | |
965 | struct qcom_smd_endpoint *qsept = to_smd_endpoint(ept); | |
966 | ||
967 | return __qcom_smd_send(qsept->qsch, data, len, true); | |
968 | } | |
969 | ||
970 | static int qcom_smd_trysend(struct rpmsg_endpoint *ept, void *data, int len) | |
971 | { | |
972 | struct qcom_smd_endpoint *qsept = to_smd_endpoint(ept); | |
973 | ||
974 | return __qcom_smd_send(qsept->qsch, data, len, false); | |
975 | } | |
976 | ||
afc9a42b | 977 | static __poll_t qcom_smd_poll(struct rpmsg_endpoint *ept, |
adaa11b0 BA |
978 | struct file *filp, poll_table *wait) |
979 | { | |
980 | struct qcom_smd_endpoint *qsept = to_smd_endpoint(ept); | |
981 | struct qcom_smd_channel *channel = qsept->qsch; | |
afc9a42b | 982 | __poll_t mask = 0; |
adaa11b0 BA |
983 | |
984 | poll_wait(filp, &channel->fblockread_event, wait); | |
985 | ||
986 | if (qcom_smd_get_tx_avail(channel) > 20) | |
a9a08845 | 987 | mask |= EPOLLOUT | EPOLLWRNORM; |
adaa11b0 BA |
988 | |
989 | return mask; | |
990 | } | |
991 | ||
53e2822e BA |
992 | /* |
993 | * Finds the device_node for the smd child interested in this channel. | |
994 | */ | |
995 | static struct device_node *qcom_smd_match_channel(struct device_node *edge_node, | |
996 | const char *channel) | |
997 | { | |
998 | struct device_node *child; | |
999 | const char *name; | |
1000 | const char *key; | |
1001 | int ret; | |
1002 | ||
1003 | for_each_available_child_of_node(edge_node, child) { | |
1004 | key = "qcom,smd-channels"; | |
1005 | ret = of_property_read_string(child, key, &name); | |
1006 | if (ret) | |
1007 | continue; | |
1008 | ||
1009 | if (strcmp(name, channel) == 0) | |
1010 | return child; | |
1011 | } | |
1012 | ||
1013 | return NULL; | |
1014 | } | |
1015 | ||
0d72038c BA |
1016 | static int qcom_smd_announce_create(struct rpmsg_device *rpdev) |
1017 | { | |
1018 | struct qcom_smd_endpoint *qept = to_smd_endpoint(rpdev->ept); | |
1019 | struct qcom_smd_channel *channel = qept->qsch; | |
1020 | unsigned long flags; | |
1021 | bool kick_state; | |
1022 | ||
1023 | spin_lock_irqsave(&channel->recv_lock, flags); | |
1024 | kick_state = qcom_smd_channel_intr(channel); | |
1025 | spin_unlock_irqrestore(&channel->recv_lock, flags); | |
1026 | ||
1027 | if (kick_state) | |
1028 | schedule_work(&channel->edge->state_work); | |
1029 | ||
1030 | return 0; | |
1031 | } | |
1032 | ||
53e2822e BA |
1033 | static const struct rpmsg_device_ops qcom_smd_device_ops = { |
1034 | .create_ept = qcom_smd_create_ept, | |
0d72038c | 1035 | .announce_create = qcom_smd_announce_create, |
53e2822e BA |
1036 | }; |
1037 | ||
1038 | static const struct rpmsg_endpoint_ops qcom_smd_endpoint_ops = { | |
1039 | .destroy_ept = qcom_smd_destroy_ept, | |
1040 | .send = qcom_smd_send, | |
1041 | .trysend = qcom_smd_trysend, | |
adaa11b0 | 1042 | .poll = qcom_smd_poll, |
53e2822e BA |
1043 | }; |
1044 | ||
b0b03b81 BA |
1045 | static void qcom_smd_release_device(struct device *dev) |
1046 | { | |
1047 | struct rpmsg_device *rpdev = to_rpmsg_device(dev); | |
1048 | struct qcom_smd_device *qsdev = to_smd_device(rpdev); | |
1049 | ||
1050 | kfree(qsdev); | |
1051 | } | |
1052 | ||
53e2822e BA |
1053 | /* |
1054 | * Create a smd client device for channel that is being opened. | |
1055 | */ | |
1056 | static int qcom_smd_create_device(struct qcom_smd_channel *channel) | |
1057 | { | |
1058 | struct qcom_smd_device *qsdev; | |
1059 | struct rpmsg_device *rpdev; | |
1060 | struct qcom_smd_edge *edge = channel->edge; | |
1061 | ||
1062 | dev_dbg(&edge->dev, "registering '%s'\n", channel->name); | |
1063 | ||
1064 | qsdev = kzalloc(sizeof(*qsdev), GFP_KERNEL); | |
1065 | if (!qsdev) | |
1066 | return -ENOMEM; | |
1067 | ||
1068 | /* Link qsdev to our SMD edge */ | |
1069 | qsdev->edge = edge; | |
1070 | ||
1071 | /* Assign callbacks for rpmsg_device */ | |
1072 | qsdev->rpdev.ops = &qcom_smd_device_ops; | |
1073 | ||
1074 | /* Assign public information to the rpmsg_device */ | |
1075 | rpdev = &qsdev->rpdev; | |
1076 | strncpy(rpdev->id.name, channel->name, RPMSG_NAME_SIZE); | |
1077 | rpdev->src = RPMSG_ADDR_ANY; | |
1078 | rpdev->dst = RPMSG_ADDR_ANY; | |
1079 | ||
1080 | rpdev->dev.of_node = qcom_smd_match_channel(edge->of_node, channel->name); | |
1081 | rpdev->dev.parent = &edge->dev; | |
b0b03b81 | 1082 | rpdev->dev.release = qcom_smd_release_device; |
53e2822e BA |
1083 | |
1084 | return rpmsg_register_device(rpdev); | |
1085 | } | |
1086 | ||
0be363bf BA |
1087 | static int qcom_smd_create_chrdev(struct qcom_smd_edge *edge) |
1088 | { | |
1089 | struct qcom_smd_device *qsdev; | |
1090 | ||
1091 | qsdev = kzalloc(sizeof(*qsdev), GFP_KERNEL); | |
1092 | if (!qsdev) | |
1093 | return -ENOMEM; | |
1094 | ||
1095 | qsdev->edge = edge; | |
1096 | qsdev->rpdev.ops = &qcom_smd_device_ops; | |
1097 | qsdev->rpdev.dev.parent = &edge->dev; | |
b0b03b81 BA |
1098 | qsdev->rpdev.dev.release = qcom_smd_release_device; |
1099 | ||
0be363bf BA |
1100 | return rpmsg_chrdev_register_device(&qsdev->rpdev); |
1101 | } | |
1102 | ||
53e2822e BA |
1103 | /* |
1104 | * Allocate the qcom_smd_channel object for a newly found smd channel, | |
1105 | * retrieving and validating the smem items involved. | |
1106 | */ | |
1107 | static struct qcom_smd_channel *qcom_smd_create_channel(struct qcom_smd_edge *edge, | |
1108 | unsigned smem_info_item, | |
1109 | unsigned smem_fifo_item, | |
1110 | char *name) | |
1111 | { | |
1112 | struct qcom_smd_channel *channel; | |
1113 | size_t fifo_size; | |
1114 | size_t info_size; | |
1115 | void *fifo_base; | |
1116 | void *info; | |
1117 | int ret; | |
1118 | ||
1119 | channel = devm_kzalloc(&edge->dev, sizeof(*channel), GFP_KERNEL); | |
1120 | if (!channel) | |
1121 | return ERR_PTR(-ENOMEM); | |
1122 | ||
1123 | channel->edge = edge; | |
1124 | channel->name = devm_kstrdup(&edge->dev, name, GFP_KERNEL); | |
1125 | if (!channel->name) | |
1126 | return ERR_PTR(-ENOMEM); | |
1127 | ||
33e3820d | 1128 | spin_lock_init(&channel->tx_lock); |
53e2822e BA |
1129 | spin_lock_init(&channel->recv_lock); |
1130 | init_waitqueue_head(&channel->fblockread_event); | |
268105fb | 1131 | init_waitqueue_head(&channel->state_change_event); |
53e2822e BA |
1132 | |
1133 | info = qcom_smem_get(edge->remote_pid, smem_info_item, &info_size); | |
1134 | if (IS_ERR(info)) { | |
1135 | ret = PTR_ERR(info); | |
1136 | goto free_name_and_channel; | |
1137 | } | |
1138 | ||
1139 | /* | |
1140 | * Use the size of the item to figure out which channel info struct to | |
1141 | * use. | |
1142 | */ | |
1143 | if (info_size == 2 * sizeof(struct smd_channel_info_word)) { | |
1144 | channel->info_word = info; | |
1145 | } else if (info_size == 2 * sizeof(struct smd_channel_info)) { | |
1146 | channel->info = info; | |
1147 | } else { | |
1148 | dev_err(&edge->dev, | |
1149 | "channel info of size %zu not supported\n", info_size); | |
1150 | ret = -EINVAL; | |
1151 | goto free_name_and_channel; | |
1152 | } | |
1153 | ||
1154 | fifo_base = qcom_smem_get(edge->remote_pid, smem_fifo_item, &fifo_size); | |
1155 | if (IS_ERR(fifo_base)) { | |
1156 | ret = PTR_ERR(fifo_base); | |
1157 | goto free_name_and_channel; | |
1158 | } | |
1159 | ||
1160 | /* The channel consist of a rx and tx fifo of equal size */ | |
1161 | fifo_size /= 2; | |
1162 | ||
1163 | dev_dbg(&edge->dev, "new channel '%s' info-size: %zu fifo-size: %zu\n", | |
1164 | name, info_size, fifo_size); | |
1165 | ||
1166 | channel->tx_fifo = fifo_base; | |
1167 | channel->rx_fifo = fifo_base + fifo_size; | |
1168 | channel->fifo_size = fifo_size; | |
1169 | ||
1170 | qcom_smd_channel_reset(channel); | |
1171 | ||
1172 | return channel; | |
1173 | ||
1174 | free_name_and_channel: | |
1175 | devm_kfree(&edge->dev, channel->name); | |
1176 | devm_kfree(&edge->dev, channel); | |
1177 | ||
1178 | return ERR_PTR(ret); | |
1179 | } | |
1180 | ||
1181 | /* | |
1182 | * Scans the allocation table for any newly allocated channels, calls | |
1183 | * qcom_smd_create_channel() to create representations of these and add | |
1184 | * them to the edge's list of channels. | |
1185 | */ | |
1186 | static void qcom_channel_scan_worker(struct work_struct *work) | |
1187 | { | |
1188 | struct qcom_smd_edge *edge = container_of(work, struct qcom_smd_edge, scan_work); | |
1189 | struct qcom_smd_alloc_entry *alloc_tbl; | |
1190 | struct qcom_smd_alloc_entry *entry; | |
1191 | struct qcom_smd_channel *channel; | |
1192 | unsigned long flags; | |
1193 | unsigned fifo_id; | |
1194 | unsigned info_id; | |
1195 | int tbl; | |
1196 | int i; | |
1197 | u32 eflags, cid; | |
1198 | ||
1199 | for (tbl = 0; tbl < SMD_ALLOC_TBL_COUNT; tbl++) { | |
1200 | alloc_tbl = qcom_smem_get(edge->remote_pid, | |
1201 | smem_items[tbl].alloc_tbl_id, NULL); | |
1202 | if (IS_ERR(alloc_tbl)) | |
1203 | continue; | |
1204 | ||
1205 | for (i = 0; i < SMD_ALLOC_TBL_SIZE; i++) { | |
1206 | entry = &alloc_tbl[i]; | |
1207 | eflags = le32_to_cpu(entry->flags); | |
1208 | if (test_bit(i, edge->allocated[tbl])) | |
1209 | continue; | |
1210 | ||
1211 | if (entry->ref_count == 0) | |
1212 | continue; | |
1213 | ||
1214 | if (!entry->name[0]) | |
1215 | continue; | |
1216 | ||
1217 | if (!(eflags & SMD_CHANNEL_FLAGS_PACKET)) | |
1218 | continue; | |
1219 | ||
1220 | if ((eflags & SMD_CHANNEL_FLAGS_EDGE_MASK) != edge->edge_id) | |
1221 | continue; | |
1222 | ||
1223 | cid = le32_to_cpu(entry->cid); | |
1224 | info_id = smem_items[tbl].info_base_id + cid; | |
1225 | fifo_id = smem_items[tbl].fifo_base_id + cid; | |
1226 | ||
1227 | channel = qcom_smd_create_channel(edge, info_id, fifo_id, entry->name); | |
1228 | if (IS_ERR(channel)) | |
1229 | continue; | |
1230 | ||
1231 | spin_lock_irqsave(&edge->channels_lock, flags); | |
1232 | list_add(&channel->list, &edge->channels); | |
1233 | spin_unlock_irqrestore(&edge->channels_lock, flags); | |
1234 | ||
1235 | dev_dbg(&edge->dev, "new channel found: '%s'\n", channel->name); | |
1236 | set_bit(i, edge->allocated[tbl]); | |
1237 | ||
eb114f27 | 1238 | wake_up_interruptible_all(&edge->new_channel_event); |
53e2822e BA |
1239 | } |
1240 | } | |
1241 | ||
1242 | schedule_work(&edge->state_work); | |
1243 | } | |
1244 | ||
1245 | /* | |
1246 | * This per edge worker scans smem for any new channels and register these. It | |
1247 | * then scans all registered channels for state changes that should be handled | |
1248 | * by creating or destroying smd client devices for the registered channels. | |
1249 | * | |
1250 | * LOCKING: edge->channels_lock only needs to cover the list operations, as the | |
1251 | * worker is killed before any channels are deallocated | |
1252 | */ | |
1253 | static void qcom_channel_state_worker(struct work_struct *work) | |
1254 | { | |
1255 | struct qcom_smd_channel *channel; | |
1256 | struct qcom_smd_edge *edge = container_of(work, | |
1257 | struct qcom_smd_edge, | |
1258 | state_work); | |
1259 | struct rpmsg_channel_info chinfo; | |
1260 | unsigned remote_state; | |
1261 | unsigned long flags; | |
1262 | ||
1263 | /* | |
1264 | * Register a device for any closed channel where the remote processor | |
1265 | * is showing interest in opening the channel. | |
1266 | */ | |
1267 | spin_lock_irqsave(&edge->channels_lock, flags); | |
1268 | list_for_each_entry(channel, &edge->channels, list) { | |
1269 | if (channel->state != SMD_CHANNEL_CLOSED) | |
1270 | continue; | |
1271 | ||
2bd9b438 BA |
1272 | remote_state = GET_RX_CHANNEL_INFO(channel, state); |
1273 | if (remote_state != SMD_CHANNEL_OPENING && | |
1274 | remote_state != SMD_CHANNEL_OPENED) | |
1275 | continue; | |
1276 | ||
53e2822e BA |
1277 | if (channel->registered) |
1278 | continue; | |
1279 | ||
1280 | spin_unlock_irqrestore(&edge->channels_lock, flags); | |
1281 | qcom_smd_create_device(channel); | |
1282 | channel->registered = true; | |
1283 | spin_lock_irqsave(&edge->channels_lock, flags); | |
1284 | ||
1285 | channel->registered = true; | |
1286 | } | |
1287 | ||
1288 | /* | |
1289 | * Unregister the device for any channel that is opened where the | |
1290 | * remote processor is closing the channel. | |
1291 | */ | |
1292 | list_for_each_entry(channel, &edge->channels, list) { | |
1293 | if (channel->state != SMD_CHANNEL_OPENING && | |
1294 | channel->state != SMD_CHANNEL_OPENED) | |
1295 | continue; | |
1296 | ||
1297 | remote_state = GET_RX_CHANNEL_INFO(channel, state); | |
1298 | if (remote_state == SMD_CHANNEL_OPENING || | |
1299 | remote_state == SMD_CHANNEL_OPENED) | |
1300 | continue; | |
1301 | ||
1302 | spin_unlock_irqrestore(&edge->channels_lock, flags); | |
1303 | ||
1304 | strncpy(chinfo.name, channel->name, sizeof(chinfo.name)); | |
1305 | chinfo.src = RPMSG_ADDR_ANY; | |
1306 | chinfo.dst = RPMSG_ADDR_ANY; | |
1307 | rpmsg_unregister_device(&edge->dev, &chinfo); | |
1308 | channel->registered = false; | |
1309 | spin_lock_irqsave(&edge->channels_lock, flags); | |
1310 | } | |
1311 | spin_unlock_irqrestore(&edge->channels_lock, flags); | |
1312 | } | |
1313 | ||
1314 | /* | |
1315 | * Parses an of_node describing an edge. | |
1316 | */ | |
1317 | static int qcom_smd_parse_edge(struct device *dev, | |
1318 | struct device_node *node, | |
1319 | struct qcom_smd_edge *edge) | |
1320 | { | |
1321 | struct device_node *syscon_np; | |
1322 | const char *key; | |
1323 | int irq; | |
1324 | int ret; | |
1325 | ||
1326 | INIT_LIST_HEAD(&edge->channels); | |
1327 | spin_lock_init(&edge->channels_lock); | |
1328 | ||
1329 | INIT_WORK(&edge->scan_work, qcom_channel_scan_worker); | |
1330 | INIT_WORK(&edge->state_work, qcom_channel_state_worker); | |
1331 | ||
1332 | edge->of_node = of_node_get(node); | |
1333 | ||
1334 | key = "qcom,smd-edge"; | |
1335 | ret = of_property_read_u32(node, key, &edge->edge_id); | |
1336 | if (ret) { | |
1337 | dev_err(dev, "edge missing %s property\n", key); | |
1338 | return -EINVAL; | |
1339 | } | |
1340 | ||
1341 | edge->remote_pid = QCOM_SMEM_HOST_ANY; | |
1342 | key = "qcom,remote-pid"; | |
1343 | of_property_read_u32(node, key, &edge->remote_pid); | |
1344 | ||
ab460a2e BA |
1345 | edge->mbox_client.dev = dev; |
1346 | edge->mbox_client.knows_txdone = true; | |
1347 | edge->mbox_chan = mbox_request_channel(&edge->mbox_client, 0); | |
1348 | if (IS_ERR(edge->mbox_chan)) { | |
1349 | if (PTR_ERR(edge->mbox_chan) != -ENODEV) | |
1350 | return PTR_ERR(edge->mbox_chan); | |
53e2822e | 1351 | |
ab460a2e | 1352 | edge->mbox_chan = NULL; |
53e2822e | 1353 | |
ab460a2e BA |
1354 | syscon_np = of_parse_phandle(node, "qcom,ipc", 0); |
1355 | if (!syscon_np) { | |
1356 | dev_err(dev, "no qcom,ipc node\n"); | |
1357 | return -ENODEV; | |
1358 | } | |
53e2822e | 1359 | |
ab460a2e BA |
1360 | edge->ipc_regmap = syscon_node_to_regmap(syscon_np); |
1361 | if (IS_ERR(edge->ipc_regmap)) | |
1362 | return PTR_ERR(edge->ipc_regmap); | |
1363 | ||
1364 | key = "qcom,ipc"; | |
1365 | ret = of_property_read_u32_index(node, key, 1, &edge->ipc_offset); | |
1366 | if (ret < 0) { | |
1367 | dev_err(dev, "no offset in %s\n", key); | |
1368 | return -EINVAL; | |
1369 | } | |
1370 | ||
1371 | ret = of_property_read_u32_index(node, key, 2, &edge->ipc_bit); | |
1372 | if (ret < 0) { | |
1373 | dev_err(dev, "no bit in %s\n", key); | |
1374 | return -EINVAL; | |
1375 | } | |
53e2822e BA |
1376 | } |
1377 | ||
5e53c42c BA |
1378 | ret = of_property_read_string(node, "label", &edge->name); |
1379 | if (ret < 0) | |
1380 | edge->name = node->name; | |
1381 | ||
53e2822e BA |
1382 | irq = irq_of_parse_and_map(node, 0); |
1383 | if (irq < 0) { | |
1384 | dev_err(dev, "required smd interrupt missing\n"); | |
1385 | return -EINVAL; | |
1386 | } | |
1387 | ||
1388 | ret = devm_request_irq(dev, irq, | |
1389 | qcom_smd_edge_intr, IRQF_TRIGGER_RISING, | |
1390 | node->name, edge); | |
1391 | if (ret) { | |
1392 | dev_err(dev, "failed to request smd irq\n"); | |
1393 | return ret; | |
1394 | } | |
1395 | ||
1396 | edge->irq = irq; | |
1397 | ||
1398 | return 0; | |
1399 | } | |
1400 | ||
1401 | /* | |
1402 | * Release function for an edge. | |
1403 | * Reset the state of each associated channel and free the edge context. | |
1404 | */ | |
1405 | static void qcom_smd_edge_release(struct device *dev) | |
1406 | { | |
1407 | struct qcom_smd_channel *channel; | |
1408 | struct qcom_smd_edge *edge = to_smd_edge(dev); | |
1409 | ||
1410 | list_for_each_entry(channel, &edge->channels, list) { | |
1411 | SET_RX_CHANNEL_INFO(channel, state, SMD_CHANNEL_CLOSED); | |
1412 | SET_RX_CHANNEL_INFO(channel, head, 0); | |
1413 | SET_RX_CHANNEL_INFO(channel, tail, 0); | |
1414 | } | |
1415 | ||
1416 | kfree(edge); | |
1417 | } | |
1418 | ||
5e53c42c BA |
1419 | static ssize_t rpmsg_name_show(struct device *dev, |
1420 | struct device_attribute *attr, char *buf) | |
1421 | { | |
1422 | struct qcom_smd_edge *edge = to_smd_edge(dev); | |
1423 | ||
1424 | return sprintf(buf, "%s\n", edge->name); | |
1425 | } | |
1426 | static DEVICE_ATTR_RO(rpmsg_name); | |
1427 | ||
1428 | static struct attribute *qcom_smd_edge_attrs[] = { | |
1429 | &dev_attr_rpmsg_name.attr, | |
1430 | NULL | |
1431 | }; | |
1432 | ATTRIBUTE_GROUPS(qcom_smd_edge); | |
1433 | ||
53e2822e BA |
1434 | /** |
1435 | * qcom_smd_register_edge() - register an edge based on an device_node | |
1436 | * @parent: parent device for the edge | |
1437 | * @node: device_node describing the edge | |
1438 | * | |
1439 | * Returns an edge reference, or negative ERR_PTR() on failure. | |
1440 | */ | |
1441 | struct qcom_smd_edge *qcom_smd_register_edge(struct device *parent, | |
1442 | struct device_node *node) | |
1443 | { | |
1444 | struct qcom_smd_edge *edge; | |
1445 | int ret; | |
1446 | ||
1447 | edge = kzalloc(sizeof(*edge), GFP_KERNEL); | |
1448 | if (!edge) | |
1449 | return ERR_PTR(-ENOMEM); | |
1450 | ||
1451 | init_waitqueue_head(&edge->new_channel_event); | |
1452 | ||
1453 | edge->dev.parent = parent; | |
1454 | edge->dev.release = qcom_smd_edge_release; | |
aaafb24e | 1455 | edge->dev.of_node = node; |
5e53c42c | 1456 | edge->dev.groups = qcom_smd_edge_groups; |
53e2822e BA |
1457 | dev_set_name(&edge->dev, "%s:%s", dev_name(parent), node->name); |
1458 | ret = device_register(&edge->dev); | |
1459 | if (ret) { | |
1460 | pr_err("failed to register smd edge\n"); | |
be5acd24 | 1461 | put_device(&edge->dev); |
53e2822e BA |
1462 | return ERR_PTR(ret); |
1463 | } | |
1464 | ||
1465 | ret = qcom_smd_parse_edge(&edge->dev, node, edge); | |
1466 | if (ret) { | |
1467 | dev_err(&edge->dev, "failed to parse smd edge\n"); | |
1468 | goto unregister_dev; | |
1469 | } | |
1470 | ||
0be363bf BA |
1471 | ret = qcom_smd_create_chrdev(edge); |
1472 | if (ret) { | |
1473 | dev_err(&edge->dev, "failed to register chrdev for edge\n"); | |
1474 | goto unregister_dev; | |
1475 | } | |
1476 | ||
53e2822e BA |
1477 | schedule_work(&edge->scan_work); |
1478 | ||
1479 | return edge; | |
1480 | ||
1481 | unregister_dev: | |
ab460a2e BA |
1482 | if (!IS_ERR_OR_NULL(edge->mbox_chan)) |
1483 | mbox_free_channel(edge->mbox_chan); | |
1484 | ||
be5acd24 | 1485 | device_unregister(&edge->dev); |
53e2822e BA |
1486 | return ERR_PTR(ret); |
1487 | } | |
1488 | EXPORT_SYMBOL(qcom_smd_register_edge); | |
1489 | ||
1490 | static int qcom_smd_remove_device(struct device *dev, void *data) | |
1491 | { | |
1492 | device_unregister(dev); | |
1493 | ||
1494 | return 0; | |
1495 | } | |
1496 | ||
1497 | /** | |
1498 | * qcom_smd_unregister_edge() - release an edge and its children | |
1499 | * @edge: edge reference acquired from qcom_smd_register_edge | |
1500 | */ | |
1501 | int qcom_smd_unregister_edge(struct qcom_smd_edge *edge) | |
1502 | { | |
1503 | int ret; | |
1504 | ||
1505 | disable_irq(edge->irq); | |
1506 | cancel_work_sync(&edge->scan_work); | |
1507 | cancel_work_sync(&edge->state_work); | |
1508 | ||
1509 | ret = device_for_each_child(&edge->dev, NULL, qcom_smd_remove_device); | |
1510 | if (ret) | |
1511 | dev_warn(&edge->dev, "can't remove smd device: %d\n", ret); | |
1512 | ||
ab460a2e | 1513 | mbox_free_channel(edge->mbox_chan); |
53e2822e BA |
1514 | device_unregister(&edge->dev); |
1515 | ||
1516 | return 0; | |
1517 | } | |
1518 | EXPORT_SYMBOL(qcom_smd_unregister_edge); | |
1519 | ||
1520 | static int qcom_smd_probe(struct platform_device *pdev) | |
1521 | { | |
1522 | struct device_node *node; | |
1523 | void *p; | |
1524 | ||
1525 | /* Wait for smem */ | |
1526 | p = qcom_smem_get(QCOM_SMEM_HOST_ANY, smem_items[0].alloc_tbl_id, NULL); | |
1527 | if (PTR_ERR(p) == -EPROBE_DEFER) | |
1528 | return PTR_ERR(p); | |
1529 | ||
1530 | for_each_available_child_of_node(pdev->dev.of_node, node) | |
1531 | qcom_smd_register_edge(&pdev->dev, node); | |
1532 | ||
1533 | return 0; | |
1534 | } | |
1535 | ||
1536 | static int qcom_smd_remove_edge(struct device *dev, void *data) | |
1537 | { | |
1538 | struct qcom_smd_edge *edge = to_smd_edge(dev); | |
1539 | ||
1540 | return qcom_smd_unregister_edge(edge); | |
1541 | } | |
1542 | ||
1543 | /* | |
1544 | * Shut down all smd clients by making sure that each edge stops processing | |
1545 | * events and scanning for new channels, then call destroy on the devices. | |
1546 | */ | |
1547 | static int qcom_smd_remove(struct platform_device *pdev) | |
1548 | { | |
1549 | int ret; | |
1550 | ||
1551 | ret = device_for_each_child(&pdev->dev, NULL, qcom_smd_remove_edge); | |
1552 | if (ret) | |
1553 | dev_warn(&pdev->dev, "can't remove smd device: %d\n", ret); | |
1554 | ||
1555 | return ret; | |
1556 | } | |
1557 | ||
1558 | static const struct of_device_id qcom_smd_of_match[] = { | |
1559 | { .compatible = "qcom,smd" }, | |
1560 | {} | |
1561 | }; | |
1562 | MODULE_DEVICE_TABLE(of, qcom_smd_of_match); | |
1563 | ||
1564 | static struct platform_driver qcom_smd_driver = { | |
1565 | .probe = qcom_smd_probe, | |
1566 | .remove = qcom_smd_remove, | |
1567 | .driver = { | |
1568 | .name = "qcom-smd", | |
1569 | .of_match_table = qcom_smd_of_match, | |
1570 | }, | |
1571 | }; | |
1572 | ||
1573 | static int __init qcom_smd_init(void) | |
1574 | { | |
1575 | return platform_driver_register(&qcom_smd_driver); | |
1576 | } | |
1577 | subsys_initcall(qcom_smd_init); | |
1578 | ||
1579 | static void __exit qcom_smd_exit(void) | |
1580 | { | |
1581 | platform_driver_unregister(&qcom_smd_driver); | |
1582 | } | |
1583 | module_exit(qcom_smd_exit); | |
1584 | ||
1585 | MODULE_AUTHOR("Bjorn Andersson <bjorn.andersson@sonymobile.com>"); | |
1586 | MODULE_DESCRIPTION("Qualcomm Shared Memory Driver"); | |
1587 | MODULE_LICENSE("GPL v2"); |