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49b05978 | 1 | // SPDX-License-Identifier: GPL-2.0 |
53e2822e BA |
2 | /* |
3 | * Copyright (c) 2015, Sony Mobile Communications AB. | |
4 | * Copyright (c) 2012-2013, The Linux Foundation. All rights reserved. | |
53e2822e BA |
5 | */ |
6 | ||
7 | #include <linux/interrupt.h> | |
8 | #include <linux/io.h> | |
ab460a2e | 9 | #include <linux/mailbox_client.h> |
53e2822e BA |
10 | #include <linux/mfd/syscon.h> |
11 | #include <linux/module.h> | |
12 | #include <linux/of_irq.h> | |
13 | #include <linux/of_platform.h> | |
14 | #include <linux/platform_device.h> | |
15 | #include <linux/regmap.h> | |
16 | #include <linux/sched.h> | |
67cd0eec | 17 | #include <linux/sizes.h> |
53e2822e BA |
18 | #include <linux/slab.h> |
19 | #include <linux/soc/qcom/smem.h> | |
20 | #include <linux/wait.h> | |
21 | #include <linux/rpmsg.h> | |
8fc94723 | 22 | #include <linux/rpmsg/qcom_smd.h> |
53e2822e BA |
23 | |
24 | #include "rpmsg_internal.h" | |
25 | ||
26 | /* | |
27 | * The Qualcomm Shared Memory communication solution provides point-to-point | |
28 | * channels for clients to send and receive streaming or packet based data. | |
29 | * | |
30 | * Each channel consists of a control item (channel info) and a ring buffer | |
31 | * pair. The channel info carry information related to channel state, flow | |
32 | * control and the offsets within the ring buffer. | |
33 | * | |
34 | * All allocated channels are listed in an allocation table, identifying the | |
35 | * pair of items by name, type and remote processor. | |
36 | * | |
37 | * Upon creating a new channel the remote processor allocates channel info and | |
38 | * ring buffer items from the smem heap and populate the allocation table. An | |
39 | * interrupt is sent to the other end of the channel and a scan for new | |
40 | * channels should be done. A channel never goes away, it will only change | |
41 | * state. | |
42 | * | |
43 | * The remote processor signals it intent for bring up the communication | |
44 | * channel by setting the state of its end of the channel to "opening" and | |
45 | * sends out an interrupt. We detect this change and register a smd device to | |
46 | * consume the channel. Upon finding a consumer we finish the handshake and the | |
47 | * channel is up. | |
48 | * | |
49 | * Upon closing a channel, the remote processor will update the state of its | |
50 | * end of the channel and signal us, we will then unregister any attached | |
51 | * device and close our end of the channel. | |
52 | * | |
53 | * Devices attached to a channel can use the qcom_smd_send function to push | |
54 | * data to the channel, this is done by copying the data into the tx ring | |
55 | * buffer, updating the pointers in the channel info and signaling the remote | |
56 | * processor. | |
57 | * | |
58 | * The remote processor does the equivalent when it transfer data and upon | |
59 | * receiving the interrupt we check the channel info for new data and delivers | |
60 | * this to the attached device. If the device is not ready to receive the data | |
61 | * we leave it in the ring buffer for now. | |
62 | */ | |
63 | ||
64 | struct smd_channel_info; | |
65 | struct smd_channel_info_pair; | |
66 | struct smd_channel_info_word; | |
67 | struct smd_channel_info_word_pair; | |
68 | ||
69 | static const struct rpmsg_endpoint_ops qcom_smd_endpoint_ops; | |
70 | ||
71 | #define SMD_ALLOC_TBL_COUNT 2 | |
72 | #define SMD_ALLOC_TBL_SIZE 64 | |
73 | ||
74 | /* | |
75 | * This lists the various smem heap items relevant for the allocation table and | |
76 | * smd channel entries. | |
77 | */ | |
78 | static const struct { | |
79 | unsigned alloc_tbl_id; | |
80 | unsigned info_base_id; | |
81 | unsigned fifo_base_id; | |
82 | } smem_items[SMD_ALLOC_TBL_COUNT] = { | |
83 | { | |
84 | .alloc_tbl_id = 13, | |
85 | .info_base_id = 14, | |
86 | .fifo_base_id = 338 | |
87 | }, | |
88 | { | |
89 | .alloc_tbl_id = 266, | |
90 | .info_base_id = 138, | |
91 | .fifo_base_id = 202, | |
92 | }, | |
93 | }; | |
94 | ||
95 | /** | |
96 | * struct qcom_smd_edge - representing a remote processor | |
82eca590 SK |
97 | * @dev: device associated with this edge |
98 | * @name: name of this edge | |
53e2822e BA |
99 | * @of_node: of_node handle for information related to this edge |
100 | * @edge_id: identifier of this edge | |
101 | * @remote_pid: identifier of remote processor | |
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 | |
ab460a2e BA |
106 | * @mbox_client: mailbox client handle |
107 | * @mbox_chan: apcs ipc mailbox channel handle | |
53e2822e BA |
108 | * @channels: list of all channels detected on this edge |
109 | * @channels_lock: guard for modifications of @channels | |
110 | * @allocated: array of bitmaps representing already allocated channels | |
111 | * @smem_available: last available amount of smem triggering a channel scan | |
82eca590 | 112 | * @new_channel_event: wait queue for new channel events |
53e2822e BA |
113 | * @scan_work: work item for discovering new channels |
114 | * @state_work: work item for edge state changes | |
115 | */ | |
116 | struct qcom_smd_edge { | |
117 | struct device dev; | |
118 | ||
5e53c42c BA |
119 | const char *name; |
120 | ||
53e2822e BA |
121 | struct device_node *of_node; |
122 | unsigned edge_id; | |
123 | unsigned remote_pid; | |
124 | ||
125 | int irq; | |
126 | ||
127 | struct regmap *ipc_regmap; | |
128 | int ipc_offset; | |
129 | int ipc_bit; | |
130 | ||
ab460a2e BA |
131 | struct mbox_client mbox_client; |
132 | struct mbox_chan *mbox_chan; | |
133 | ||
53e2822e BA |
134 | struct list_head channels; |
135 | spinlock_t channels_lock; | |
136 | ||
137 | DECLARE_BITMAP(allocated[SMD_ALLOC_TBL_COUNT], SMD_ALLOC_TBL_SIZE); | |
138 | ||
139 | unsigned smem_available; | |
140 | ||
141 | wait_queue_head_t new_channel_event; | |
142 | ||
143 | struct work_struct scan_work; | |
144 | struct work_struct state_work; | |
145 | }; | |
146 | ||
147 | /* | |
148 | * SMD channel states. | |
149 | */ | |
150 | enum smd_channel_state { | |
151 | SMD_CHANNEL_CLOSED, | |
152 | SMD_CHANNEL_OPENING, | |
153 | SMD_CHANNEL_OPENED, | |
154 | SMD_CHANNEL_FLUSHING, | |
155 | SMD_CHANNEL_CLOSING, | |
156 | SMD_CHANNEL_RESET, | |
157 | SMD_CHANNEL_RESET_OPENING | |
158 | }; | |
159 | ||
160 | struct qcom_smd_device { | |
161 | struct rpmsg_device rpdev; | |
162 | ||
163 | struct qcom_smd_edge *edge; | |
164 | }; | |
165 | ||
166 | struct qcom_smd_endpoint { | |
167 | struct rpmsg_endpoint ept; | |
168 | ||
169 | struct qcom_smd_channel *qsch; | |
170 | }; | |
171 | ||
6ddf12d3 | 172 | #define to_smd_device(r) container_of(r, struct qcom_smd_device, rpdev) |
53e2822e | 173 | #define to_smd_edge(d) container_of(d, struct qcom_smd_edge, dev) |
6ddf12d3 | 174 | #define to_smd_endpoint(e) container_of(e, struct qcom_smd_endpoint, ept) |
53e2822e BA |
175 | |
176 | /** | |
177 | * struct qcom_smd_channel - smd channel struct | |
178 | * @edge: qcom_smd_edge this channel is living on | |
82eca590 SK |
179 | * @qsept: reference to a associated smd endpoint |
180 | * @registered: flag to indicate if the channel is registered | |
53e2822e BA |
181 | * @name: name of the channel |
182 | * @state: local state of the channel | |
183 | * @remote_state: remote state of the channel | |
82eca590 | 184 | * @state_change_event: state change event |
53e2822e BA |
185 | * @info: byte aligned outgoing/incoming channel info |
186 | * @info_word: word aligned outgoing/incoming channel info | |
187 | * @tx_lock: lock to make writes to the channel mutually exclusive | |
188 | * @fblockread_event: wakeup event tied to tx fBLOCKREADINTR | |
189 | * @tx_fifo: pointer to the outgoing ring buffer | |
190 | * @rx_fifo: pointer to the incoming ring buffer | |
191 | * @fifo_size: size of each ring buffer | |
192 | * @bounce_buffer: bounce buffer for reading wrapped packets | |
193 | * @cb: callback function registered for this channel | |
194 | * @recv_lock: guard for rx info modifications and cb pointer | |
195 | * @pkt_size: size of the currently handled packet | |
82eca590 | 196 | * @drvdata: driver private data |
53e2822e BA |
197 | * @list: lite entry for @channels in qcom_smd_edge |
198 | */ | |
199 | struct qcom_smd_channel { | |
200 | struct qcom_smd_edge *edge; | |
201 | ||
202 | struct qcom_smd_endpoint *qsept; | |
203 | bool registered; | |
204 | ||
205 | char *name; | |
206 | enum smd_channel_state state; | |
207 | enum smd_channel_state remote_state; | |
268105fb | 208 | wait_queue_head_t state_change_event; |
53e2822e BA |
209 | |
210 | struct smd_channel_info_pair *info; | |
211 | struct smd_channel_info_word_pair *info_word; | |
212 | ||
33e3820d | 213 | spinlock_t tx_lock; |
53e2822e BA |
214 | wait_queue_head_t fblockread_event; |
215 | ||
216 | void *tx_fifo; | |
217 | void *rx_fifo; | |
218 | int fifo_size; | |
219 | ||
220 | void *bounce_buffer; | |
221 | ||
222 | spinlock_t recv_lock; | |
223 | ||
224 | int pkt_size; | |
225 | ||
226 | void *drvdata; | |
227 | ||
228 | struct list_head list; | |
229 | }; | |
230 | ||
231 | /* | |
232 | * Format of the smd_info smem items, for byte aligned channels. | |
233 | */ | |
234 | struct smd_channel_info { | |
235 | __le32 state; | |
236 | u8 fDSR; | |
237 | u8 fCTS; | |
238 | u8 fCD; | |
239 | u8 fRI; | |
240 | u8 fHEAD; | |
241 | u8 fTAIL; | |
242 | u8 fSTATE; | |
243 | u8 fBLOCKREADINTR; | |
244 | __le32 tail; | |
245 | __le32 head; | |
246 | }; | |
247 | ||
248 | struct smd_channel_info_pair { | |
249 | struct smd_channel_info tx; | |
250 | struct smd_channel_info rx; | |
251 | }; | |
252 | ||
253 | /* | |
254 | * Format of the smd_info smem items, for word aligned channels. | |
255 | */ | |
256 | struct smd_channel_info_word { | |
257 | __le32 state; | |
258 | __le32 fDSR; | |
259 | __le32 fCTS; | |
260 | __le32 fCD; | |
261 | __le32 fRI; | |
262 | __le32 fHEAD; | |
263 | __le32 fTAIL; | |
264 | __le32 fSTATE; | |
265 | __le32 fBLOCKREADINTR; | |
266 | __le32 tail; | |
267 | __le32 head; | |
268 | }; | |
269 | ||
270 | struct smd_channel_info_word_pair { | |
271 | struct smd_channel_info_word tx; | |
272 | struct smd_channel_info_word rx; | |
273 | }; | |
274 | ||
275 | #define GET_RX_CHANNEL_FLAG(channel, param) \ | |
276 | ({ \ | |
277 | BUILD_BUG_ON(sizeof(channel->info->rx.param) != sizeof(u8)); \ | |
278 | channel->info_word ? \ | |
279 | le32_to_cpu(channel->info_word->rx.param) : \ | |
280 | channel->info->rx.param; \ | |
281 | }) | |
282 | ||
283 | #define GET_RX_CHANNEL_INFO(channel, param) \ | |
284 | ({ \ | |
285 | BUILD_BUG_ON(sizeof(channel->info->rx.param) != sizeof(u32)); \ | |
286 | le32_to_cpu(channel->info_word ? \ | |
287 | channel->info_word->rx.param : \ | |
288 | channel->info->rx.param); \ | |
289 | }) | |
290 | ||
291 | #define SET_RX_CHANNEL_FLAG(channel, param, value) \ | |
292 | ({ \ | |
293 | BUILD_BUG_ON(sizeof(channel->info->rx.param) != sizeof(u8)); \ | |
294 | if (channel->info_word) \ | |
295 | channel->info_word->rx.param = cpu_to_le32(value); \ | |
296 | else \ | |
297 | channel->info->rx.param = value; \ | |
298 | }) | |
299 | ||
300 | #define SET_RX_CHANNEL_INFO(channel, param, value) \ | |
301 | ({ \ | |
302 | BUILD_BUG_ON(sizeof(channel->info->rx.param) != sizeof(u32)); \ | |
303 | if (channel->info_word) \ | |
304 | channel->info_word->rx.param = cpu_to_le32(value); \ | |
305 | else \ | |
306 | channel->info->rx.param = cpu_to_le32(value); \ | |
307 | }) | |
308 | ||
309 | #define GET_TX_CHANNEL_FLAG(channel, param) \ | |
310 | ({ \ | |
311 | BUILD_BUG_ON(sizeof(channel->info->tx.param) != sizeof(u8)); \ | |
312 | channel->info_word ? \ | |
313 | le32_to_cpu(channel->info_word->tx.param) : \ | |
314 | channel->info->tx.param; \ | |
315 | }) | |
316 | ||
317 | #define GET_TX_CHANNEL_INFO(channel, param) \ | |
318 | ({ \ | |
319 | BUILD_BUG_ON(sizeof(channel->info->tx.param) != sizeof(u32)); \ | |
320 | le32_to_cpu(channel->info_word ? \ | |
321 | channel->info_word->tx.param : \ | |
322 | channel->info->tx.param); \ | |
323 | }) | |
324 | ||
325 | #define SET_TX_CHANNEL_FLAG(channel, param, value) \ | |
326 | ({ \ | |
327 | BUILD_BUG_ON(sizeof(channel->info->tx.param) != sizeof(u8)); \ | |
328 | if (channel->info_word) \ | |
329 | channel->info_word->tx.param = cpu_to_le32(value); \ | |
330 | else \ | |
331 | channel->info->tx.param = value; \ | |
332 | }) | |
333 | ||
334 | #define SET_TX_CHANNEL_INFO(channel, param, value) \ | |
335 | ({ \ | |
336 | BUILD_BUG_ON(sizeof(channel->info->tx.param) != sizeof(u32)); \ | |
337 | if (channel->info_word) \ | |
338 | channel->info_word->tx.param = cpu_to_le32(value); \ | |
339 | else \ | |
340 | channel->info->tx.param = cpu_to_le32(value); \ | |
341 | }) | |
342 | ||
343 | /** | |
344 | * struct qcom_smd_alloc_entry - channel allocation entry | |
345 | * @name: channel name | |
346 | * @cid: channel index | |
347 | * @flags: channel flags and edge id | |
348 | * @ref_count: reference count of the channel | |
349 | */ | |
350 | struct qcom_smd_alloc_entry { | |
351 | u8 name[20]; | |
352 | __le32 cid; | |
353 | __le32 flags; | |
354 | __le32 ref_count; | |
355 | } __packed; | |
356 | ||
357 | #define SMD_CHANNEL_FLAGS_EDGE_MASK 0xff | |
358 | #define SMD_CHANNEL_FLAGS_STREAM BIT(8) | |
359 | #define SMD_CHANNEL_FLAGS_PACKET BIT(9) | |
360 | ||
361 | /* | |
362 | * Each smd packet contains a 20 byte header, with the first 4 being the length | |
363 | * of the packet. | |
364 | */ | |
365 | #define SMD_PACKET_HEADER_LEN 20 | |
366 | ||
367 | /* | |
368 | * Signal the remote processor associated with 'channel'. | |
369 | */ | |
370 | static void qcom_smd_signal_channel(struct qcom_smd_channel *channel) | |
371 | { | |
372 | struct qcom_smd_edge *edge = channel->edge; | |
373 | ||
ab460a2e BA |
374 | if (edge->mbox_chan) { |
375 | /* | |
376 | * We can ignore a failing mbox_send_message() as the only | |
377 | * possible cause is that the FIFO in the framework is full of | |
378 | * other writes to the same bit. | |
379 | */ | |
380 | mbox_send_message(edge->mbox_chan, NULL); | |
381 | mbox_client_txdone(edge->mbox_chan, 0); | |
382 | } else { | |
383 | regmap_write(edge->ipc_regmap, edge->ipc_offset, BIT(edge->ipc_bit)); | |
384 | } | |
53e2822e BA |
385 | } |
386 | ||
387 | /* | |
388 | * Initialize the tx channel info | |
389 | */ | |
390 | static void qcom_smd_channel_reset(struct qcom_smd_channel *channel) | |
391 | { | |
392 | SET_TX_CHANNEL_INFO(channel, state, SMD_CHANNEL_CLOSED); | |
393 | SET_TX_CHANNEL_FLAG(channel, fDSR, 0); | |
394 | SET_TX_CHANNEL_FLAG(channel, fCTS, 0); | |
395 | SET_TX_CHANNEL_FLAG(channel, fCD, 0); | |
396 | SET_TX_CHANNEL_FLAG(channel, fRI, 0); | |
397 | SET_TX_CHANNEL_FLAG(channel, fHEAD, 0); | |
398 | SET_TX_CHANNEL_FLAG(channel, fTAIL, 0); | |
399 | SET_TX_CHANNEL_FLAG(channel, fSTATE, 1); | |
400 | SET_TX_CHANNEL_FLAG(channel, fBLOCKREADINTR, 1); | |
401 | SET_TX_CHANNEL_INFO(channel, head, 0); | |
402 | SET_RX_CHANNEL_INFO(channel, tail, 0); | |
403 | ||
404 | qcom_smd_signal_channel(channel); | |
405 | ||
406 | channel->state = SMD_CHANNEL_CLOSED; | |
407 | channel->pkt_size = 0; | |
408 | } | |
409 | ||
410 | /* | |
411 | * Set the callback for a channel, with appropriate locking | |
412 | */ | |
413 | static void qcom_smd_channel_set_callback(struct qcom_smd_channel *channel, | |
414 | rpmsg_rx_cb_t cb) | |
415 | { | |
416 | struct rpmsg_endpoint *ept = &channel->qsept->ept; | |
417 | unsigned long flags; | |
418 | ||
419 | spin_lock_irqsave(&channel->recv_lock, flags); | |
420 | ept->cb = cb; | |
421 | spin_unlock_irqrestore(&channel->recv_lock, flags); | |
422 | }; | |
423 | ||
424 | /* | |
425 | * Calculate the amount of data available in the rx fifo | |
426 | */ | |
427 | static size_t qcom_smd_channel_get_rx_avail(struct qcom_smd_channel *channel) | |
428 | { | |
429 | unsigned head; | |
430 | unsigned tail; | |
431 | ||
432 | head = GET_RX_CHANNEL_INFO(channel, head); | |
433 | tail = GET_RX_CHANNEL_INFO(channel, tail); | |
434 | ||
435 | return (head - tail) & (channel->fifo_size - 1); | |
436 | } | |
437 | ||
438 | /* | |
439 | * Set tx channel state and inform the remote processor | |
440 | */ | |
441 | static void qcom_smd_channel_set_state(struct qcom_smd_channel *channel, | |
442 | int state) | |
443 | { | |
444 | struct qcom_smd_edge *edge = channel->edge; | |
445 | bool is_open = state == SMD_CHANNEL_OPENED; | |
446 | ||
447 | if (channel->state == state) | |
448 | return; | |
449 | ||
450 | dev_dbg(&edge->dev, "set_state(%s, %d)\n", channel->name, state); | |
451 | ||
452 | SET_TX_CHANNEL_FLAG(channel, fDSR, is_open); | |
453 | SET_TX_CHANNEL_FLAG(channel, fCTS, is_open); | |
454 | SET_TX_CHANNEL_FLAG(channel, fCD, is_open); | |
455 | ||
456 | SET_TX_CHANNEL_INFO(channel, state, state); | |
457 | SET_TX_CHANNEL_FLAG(channel, fSTATE, 1); | |
458 | ||
459 | channel->state = state; | |
460 | qcom_smd_signal_channel(channel); | |
461 | } | |
462 | ||
463 | /* | |
464 | * Copy count bytes of data using 32bit accesses, if that's required. | |
465 | */ | |
466 | static void smd_copy_to_fifo(void __iomem *dst, | |
467 | const void *src, | |
468 | size_t count, | |
469 | bool word_aligned) | |
470 | { | |
471 | if (word_aligned) { | |
472 | __iowrite32_copy(dst, src, count / sizeof(u32)); | |
473 | } else { | |
474 | memcpy_toio(dst, src, count); | |
475 | } | |
476 | } | |
477 | ||
478 | /* | |
479 | * Copy count bytes of data using 32bit accesses, if that is required. | |
480 | */ | |
481 | static void smd_copy_from_fifo(void *dst, | |
482 | const void __iomem *src, | |
483 | size_t count, | |
484 | bool word_aligned) | |
485 | { | |
486 | if (word_aligned) { | |
487 | __ioread32_copy(dst, src, count / sizeof(u32)); | |
488 | } else { | |
489 | memcpy_fromio(dst, src, count); | |
490 | } | |
491 | } | |
492 | ||
493 | /* | |
494 | * Read count bytes of data from the rx fifo into buf, but don't advance the | |
495 | * tail. | |
496 | */ | |
497 | static size_t qcom_smd_channel_peek(struct qcom_smd_channel *channel, | |
498 | void *buf, size_t count) | |
499 | { | |
500 | bool word_aligned; | |
501 | unsigned tail; | |
502 | size_t len; | |
503 | ||
504 | word_aligned = channel->info_word; | |
505 | tail = GET_RX_CHANNEL_INFO(channel, tail); | |
506 | ||
507 | len = min_t(size_t, count, channel->fifo_size - tail); | |
508 | if (len) { | |
509 | smd_copy_from_fifo(buf, | |
510 | channel->rx_fifo + tail, | |
511 | len, | |
512 | word_aligned); | |
513 | } | |
514 | ||
515 | if (len != count) { | |
516 | smd_copy_from_fifo(buf + len, | |
517 | channel->rx_fifo, | |
518 | count - len, | |
519 | word_aligned); | |
520 | } | |
521 | ||
522 | return count; | |
523 | } | |
524 | ||
525 | /* | |
526 | * Advance the rx tail by count bytes. | |
527 | */ | |
528 | static void qcom_smd_channel_advance(struct qcom_smd_channel *channel, | |
529 | size_t count) | |
530 | { | |
531 | unsigned tail; | |
532 | ||
533 | tail = GET_RX_CHANNEL_INFO(channel, tail); | |
534 | tail += count; | |
535 | tail &= (channel->fifo_size - 1); | |
536 | SET_RX_CHANNEL_INFO(channel, tail, tail); | |
537 | } | |
538 | ||
539 | /* | |
540 | * Read out a single packet from the rx fifo and deliver it to the device | |
541 | */ | |
542 | static int qcom_smd_channel_recv_single(struct qcom_smd_channel *channel) | |
543 | { | |
544 | struct rpmsg_endpoint *ept = &channel->qsept->ept; | |
545 | unsigned tail; | |
546 | size_t len; | |
547 | void *ptr; | |
548 | int ret; | |
549 | ||
550 | tail = GET_RX_CHANNEL_INFO(channel, tail); | |
551 | ||
552 | /* Use bounce buffer if the data wraps */ | |
553 | if (tail + channel->pkt_size >= channel->fifo_size) { | |
554 | ptr = channel->bounce_buffer; | |
555 | len = qcom_smd_channel_peek(channel, ptr, channel->pkt_size); | |
556 | } else { | |
557 | ptr = channel->rx_fifo + tail; | |
558 | len = channel->pkt_size; | |
559 | } | |
560 | ||
561 | ret = ept->cb(ept->rpdev, ptr, len, ept->priv, RPMSG_ADDR_ANY); | |
562 | if (ret < 0) | |
563 | return ret; | |
564 | ||
565 | /* Only forward the tail if the client consumed the data */ | |
566 | qcom_smd_channel_advance(channel, len); | |
567 | ||
568 | channel->pkt_size = 0; | |
569 | ||
570 | return 0; | |
571 | } | |
572 | ||
573 | /* | |
574 | * Per channel interrupt handling | |
575 | */ | |
576 | static bool qcom_smd_channel_intr(struct qcom_smd_channel *channel) | |
577 | { | |
578 | bool need_state_scan = false; | |
579 | int remote_state; | |
580 | __le32 pktlen; | |
581 | int avail; | |
582 | int ret; | |
583 | ||
584 | /* Handle state changes */ | |
585 | remote_state = GET_RX_CHANNEL_INFO(channel, state); | |
586 | if (remote_state != channel->remote_state) { | |
587 | channel->remote_state = remote_state; | |
588 | need_state_scan = true; | |
268105fb BA |
589 | |
590 | wake_up_interruptible_all(&channel->state_change_event); | |
53e2822e BA |
591 | } |
592 | /* Indicate that we have seen any state change */ | |
593 | SET_RX_CHANNEL_FLAG(channel, fSTATE, 0); | |
594 | ||
595 | /* Signal waiting qcom_smd_send() about the interrupt */ | |
596 | if (!GET_TX_CHANNEL_FLAG(channel, fBLOCKREADINTR)) | |
eb114f27 | 597 | wake_up_interruptible_all(&channel->fblockread_event); |
53e2822e BA |
598 | |
599 | /* Don't consume any data until we've opened the channel */ | |
600 | if (channel->state != SMD_CHANNEL_OPENED) | |
601 | goto out; | |
602 | ||
603 | /* Indicate that we've seen the new data */ | |
604 | SET_RX_CHANNEL_FLAG(channel, fHEAD, 0); | |
605 | ||
606 | /* Consume data */ | |
607 | for (;;) { | |
608 | avail = qcom_smd_channel_get_rx_avail(channel); | |
609 | ||
610 | if (!channel->pkt_size && avail >= SMD_PACKET_HEADER_LEN) { | |
611 | qcom_smd_channel_peek(channel, &pktlen, sizeof(pktlen)); | |
612 | qcom_smd_channel_advance(channel, SMD_PACKET_HEADER_LEN); | |
613 | channel->pkt_size = le32_to_cpu(pktlen); | |
614 | } else if (channel->pkt_size && avail >= channel->pkt_size) { | |
615 | ret = qcom_smd_channel_recv_single(channel); | |
616 | if (ret) | |
617 | break; | |
618 | } else { | |
619 | break; | |
620 | } | |
621 | } | |
622 | ||
623 | /* Indicate that we have seen and updated tail */ | |
624 | SET_RX_CHANNEL_FLAG(channel, fTAIL, 1); | |
625 | ||
626 | /* Signal the remote that we've consumed the data (if requested) */ | |
627 | if (!GET_RX_CHANNEL_FLAG(channel, fBLOCKREADINTR)) { | |
628 | /* Ensure ordering of channel info updates */ | |
629 | wmb(); | |
630 | ||
631 | qcom_smd_signal_channel(channel); | |
632 | } | |
633 | ||
634 | out: | |
635 | return need_state_scan; | |
636 | } | |
637 | ||
638 | /* | |
639 | * The edge interrupts are triggered by the remote processor on state changes, | |
640 | * channel info updates or when new channels are created. | |
641 | */ | |
642 | static irqreturn_t qcom_smd_edge_intr(int irq, void *data) | |
643 | { | |
644 | struct qcom_smd_edge *edge = data; | |
645 | struct qcom_smd_channel *channel; | |
646 | unsigned available; | |
647 | bool kick_scanner = false; | |
648 | bool kick_state = false; | |
649 | ||
650 | /* | |
651 | * Handle state changes or data on each of the channels on this edge | |
652 | */ | |
653 | spin_lock(&edge->channels_lock); | |
654 | list_for_each_entry(channel, &edge->channels, list) { | |
655 | spin_lock(&channel->recv_lock); | |
656 | kick_state |= qcom_smd_channel_intr(channel); | |
657 | spin_unlock(&channel->recv_lock); | |
658 | } | |
659 | spin_unlock(&edge->channels_lock); | |
660 | ||
661 | /* | |
662 | * Creating a new channel requires allocating an smem entry, so we only | |
663 | * have to scan if the amount of available space in smem have changed | |
664 | * since last scan. | |
665 | */ | |
666 | available = qcom_smem_get_free_space(edge->remote_pid); | |
667 | if (available != edge->smem_available) { | |
668 | edge->smem_available = available; | |
669 | kick_scanner = true; | |
670 | } | |
671 | ||
672 | if (kick_scanner) | |
673 | schedule_work(&edge->scan_work); | |
674 | if (kick_state) | |
675 | schedule_work(&edge->state_work); | |
676 | ||
677 | return IRQ_HANDLED; | |
678 | } | |
679 | ||
680 | /* | |
681 | * Calculate how much space is available in the tx fifo. | |
682 | */ | |
683 | static size_t qcom_smd_get_tx_avail(struct qcom_smd_channel *channel) | |
684 | { | |
685 | unsigned head; | |
686 | unsigned tail; | |
687 | unsigned mask = channel->fifo_size - 1; | |
688 | ||
689 | head = GET_TX_CHANNEL_INFO(channel, head); | |
690 | tail = GET_TX_CHANNEL_INFO(channel, tail); | |
691 | ||
692 | return mask - ((head - tail) & mask); | |
693 | } | |
694 | ||
695 | /* | |
696 | * Write count bytes of data into channel, possibly wrapping in the ring buffer | |
697 | */ | |
698 | static int qcom_smd_write_fifo(struct qcom_smd_channel *channel, | |
699 | const void *data, | |
700 | size_t count) | |
701 | { | |
702 | bool word_aligned; | |
703 | unsigned head; | |
704 | size_t len; | |
705 | ||
706 | word_aligned = channel->info_word; | |
707 | head = GET_TX_CHANNEL_INFO(channel, head); | |
708 | ||
709 | len = min_t(size_t, count, channel->fifo_size - head); | |
710 | if (len) { | |
711 | smd_copy_to_fifo(channel->tx_fifo + head, | |
712 | data, | |
713 | len, | |
714 | word_aligned); | |
715 | } | |
716 | ||
717 | if (len != count) { | |
718 | smd_copy_to_fifo(channel->tx_fifo, | |
719 | data + len, | |
720 | count - len, | |
721 | word_aligned); | |
722 | } | |
723 | ||
724 | head += count; | |
725 | head &= (channel->fifo_size - 1); | |
726 | SET_TX_CHANNEL_INFO(channel, head, head); | |
727 | ||
728 | return count; | |
729 | } | |
730 | ||
731 | /** | |
732 | * qcom_smd_send - write data to smd channel | |
733 | * @channel: channel handle | |
734 | * @data: buffer of data to write | |
735 | * @len: number of bytes to write | |
82eca590 | 736 | * @wait: flag to indicate if write has ca wait |
53e2822e BA |
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 | ||
4a2e84c6 | 1119 | channel = kzalloc(sizeof(*channel), GFP_KERNEL); |
53e2822e BA |
1120 | if (!channel) |
1121 | return ERR_PTR(-ENOMEM); | |
1122 | ||
1123 | channel->edge = edge; | |
4a2e84c6 | 1124 | channel->name = kstrdup(name, GFP_KERNEL); |
940c620d CIK |
1125 | if (!channel->name) { |
1126 | ret = -ENOMEM; | |
1127 | goto free_channel; | |
1128 | } | |
53e2822e | 1129 | |
33e3820d | 1130 | spin_lock_init(&channel->tx_lock); |
53e2822e BA |
1131 | spin_lock_init(&channel->recv_lock); |
1132 | init_waitqueue_head(&channel->fblockread_event); | |
268105fb | 1133 | init_waitqueue_head(&channel->state_change_event); |
53e2822e BA |
1134 | |
1135 | info = qcom_smem_get(edge->remote_pid, smem_info_item, &info_size); | |
1136 | if (IS_ERR(info)) { | |
1137 | ret = PTR_ERR(info); | |
1138 | goto free_name_and_channel; | |
1139 | } | |
1140 | ||
1141 | /* | |
1142 | * Use the size of the item to figure out which channel info struct to | |
1143 | * use. | |
1144 | */ | |
1145 | if (info_size == 2 * sizeof(struct smd_channel_info_word)) { | |
1146 | channel->info_word = info; | |
1147 | } else if (info_size == 2 * sizeof(struct smd_channel_info)) { | |
1148 | channel->info = info; | |
1149 | } else { | |
1150 | dev_err(&edge->dev, | |
1151 | "channel info of size %zu not supported\n", info_size); | |
1152 | ret = -EINVAL; | |
1153 | goto free_name_and_channel; | |
1154 | } | |
1155 | ||
1156 | fifo_base = qcom_smem_get(edge->remote_pid, smem_fifo_item, &fifo_size); | |
1157 | if (IS_ERR(fifo_base)) { | |
1158 | ret = PTR_ERR(fifo_base); | |
1159 | goto free_name_and_channel; | |
1160 | } | |
1161 | ||
1162 | /* The channel consist of a rx and tx fifo of equal size */ | |
1163 | fifo_size /= 2; | |
1164 | ||
1165 | dev_dbg(&edge->dev, "new channel '%s' info-size: %zu fifo-size: %zu\n", | |
1166 | name, info_size, fifo_size); | |
1167 | ||
1168 | channel->tx_fifo = fifo_base; | |
1169 | channel->rx_fifo = fifo_base + fifo_size; | |
1170 | channel->fifo_size = fifo_size; | |
1171 | ||
1172 | qcom_smd_channel_reset(channel); | |
1173 | ||
1174 | return channel; | |
1175 | ||
1176 | free_name_and_channel: | |
4a2e84c6 | 1177 | kfree(channel->name); |
940c620d | 1178 | free_channel: |
4a2e84c6 | 1179 | kfree(channel); |
53e2822e BA |
1180 | |
1181 | return ERR_PTR(ret); | |
1182 | } | |
1183 | ||
1184 | /* | |
1185 | * Scans the allocation table for any newly allocated channels, calls | |
1186 | * qcom_smd_create_channel() to create representations of these and add | |
1187 | * them to the edge's list of channels. | |
1188 | */ | |
1189 | static void qcom_channel_scan_worker(struct work_struct *work) | |
1190 | { | |
1191 | struct qcom_smd_edge *edge = container_of(work, struct qcom_smd_edge, scan_work); | |
1192 | struct qcom_smd_alloc_entry *alloc_tbl; | |
1193 | struct qcom_smd_alloc_entry *entry; | |
1194 | struct qcom_smd_channel *channel; | |
1195 | unsigned long flags; | |
1196 | unsigned fifo_id; | |
1197 | unsigned info_id; | |
1198 | int tbl; | |
1199 | int i; | |
1200 | u32 eflags, cid; | |
1201 | ||
1202 | for (tbl = 0; tbl < SMD_ALLOC_TBL_COUNT; tbl++) { | |
1203 | alloc_tbl = qcom_smem_get(edge->remote_pid, | |
1204 | smem_items[tbl].alloc_tbl_id, NULL); | |
1205 | if (IS_ERR(alloc_tbl)) | |
1206 | continue; | |
1207 | ||
1208 | for (i = 0; i < SMD_ALLOC_TBL_SIZE; i++) { | |
1209 | entry = &alloc_tbl[i]; | |
1210 | eflags = le32_to_cpu(entry->flags); | |
1211 | if (test_bit(i, edge->allocated[tbl])) | |
1212 | continue; | |
1213 | ||
1214 | if (entry->ref_count == 0) | |
1215 | continue; | |
1216 | ||
1217 | if (!entry->name[0]) | |
1218 | continue; | |
1219 | ||
1220 | if (!(eflags & SMD_CHANNEL_FLAGS_PACKET)) | |
1221 | continue; | |
1222 | ||
1223 | if ((eflags & SMD_CHANNEL_FLAGS_EDGE_MASK) != edge->edge_id) | |
1224 | continue; | |
1225 | ||
1226 | cid = le32_to_cpu(entry->cid); | |
1227 | info_id = smem_items[tbl].info_base_id + cid; | |
1228 | fifo_id = smem_items[tbl].fifo_base_id + cid; | |
1229 | ||
1230 | channel = qcom_smd_create_channel(edge, info_id, fifo_id, entry->name); | |
1231 | if (IS_ERR(channel)) | |
1232 | continue; | |
1233 | ||
1234 | spin_lock_irqsave(&edge->channels_lock, flags); | |
1235 | list_add(&channel->list, &edge->channels); | |
1236 | spin_unlock_irqrestore(&edge->channels_lock, flags); | |
1237 | ||
1238 | dev_dbg(&edge->dev, "new channel found: '%s'\n", channel->name); | |
1239 | set_bit(i, edge->allocated[tbl]); | |
1240 | ||
eb114f27 | 1241 | wake_up_interruptible_all(&edge->new_channel_event); |
53e2822e BA |
1242 | } |
1243 | } | |
1244 | ||
1245 | schedule_work(&edge->state_work); | |
1246 | } | |
1247 | ||
1248 | /* | |
1249 | * This per edge worker scans smem for any new channels and register these. It | |
1250 | * then scans all registered channels for state changes that should be handled | |
1251 | * by creating or destroying smd client devices for the registered channels. | |
1252 | * | |
1253 | * LOCKING: edge->channels_lock only needs to cover the list operations, as the | |
1254 | * worker is killed before any channels are deallocated | |
1255 | */ | |
1256 | static void qcom_channel_state_worker(struct work_struct *work) | |
1257 | { | |
1258 | struct qcom_smd_channel *channel; | |
1259 | struct qcom_smd_edge *edge = container_of(work, | |
1260 | struct qcom_smd_edge, | |
1261 | state_work); | |
1262 | struct rpmsg_channel_info chinfo; | |
1263 | unsigned remote_state; | |
1264 | unsigned long flags; | |
1265 | ||
1266 | /* | |
1267 | * Register a device for any closed channel where the remote processor | |
1268 | * is showing interest in opening the channel. | |
1269 | */ | |
1270 | spin_lock_irqsave(&edge->channels_lock, flags); | |
1271 | list_for_each_entry(channel, &edge->channels, list) { | |
1272 | if (channel->state != SMD_CHANNEL_CLOSED) | |
1273 | continue; | |
1274 | ||
2bd9b438 BA |
1275 | remote_state = GET_RX_CHANNEL_INFO(channel, state); |
1276 | if (remote_state != SMD_CHANNEL_OPENING && | |
1277 | remote_state != SMD_CHANNEL_OPENED) | |
1278 | continue; | |
1279 | ||
53e2822e BA |
1280 | if (channel->registered) |
1281 | continue; | |
1282 | ||
1283 | spin_unlock_irqrestore(&edge->channels_lock, flags); | |
1284 | qcom_smd_create_device(channel); | |
1285 | channel->registered = true; | |
1286 | spin_lock_irqsave(&edge->channels_lock, flags); | |
1287 | ||
1288 | channel->registered = true; | |
1289 | } | |
1290 | ||
1291 | /* | |
1292 | * Unregister the device for any channel that is opened where the | |
1293 | * remote processor is closing the channel. | |
1294 | */ | |
1295 | list_for_each_entry(channel, &edge->channels, list) { | |
1296 | if (channel->state != SMD_CHANNEL_OPENING && | |
1297 | channel->state != SMD_CHANNEL_OPENED) | |
1298 | continue; | |
1299 | ||
1300 | remote_state = GET_RX_CHANNEL_INFO(channel, state); | |
1301 | if (remote_state == SMD_CHANNEL_OPENING || | |
1302 | remote_state == SMD_CHANNEL_OPENED) | |
1303 | continue; | |
1304 | ||
1305 | spin_unlock_irqrestore(&edge->channels_lock, flags); | |
1306 | ||
1307 | strncpy(chinfo.name, channel->name, sizeof(chinfo.name)); | |
1308 | chinfo.src = RPMSG_ADDR_ANY; | |
1309 | chinfo.dst = RPMSG_ADDR_ANY; | |
1310 | rpmsg_unregister_device(&edge->dev, &chinfo); | |
1311 | channel->registered = false; | |
1312 | spin_lock_irqsave(&edge->channels_lock, flags); | |
1313 | } | |
1314 | spin_unlock_irqrestore(&edge->channels_lock, flags); | |
1315 | } | |
1316 | ||
1317 | /* | |
1318 | * Parses an of_node describing an edge. | |
1319 | */ | |
1320 | static int qcom_smd_parse_edge(struct device *dev, | |
1321 | struct device_node *node, | |
1322 | struct qcom_smd_edge *edge) | |
1323 | { | |
1324 | struct device_node *syscon_np; | |
1325 | const char *key; | |
1326 | int irq; | |
1327 | int ret; | |
1328 | ||
1329 | INIT_LIST_HEAD(&edge->channels); | |
1330 | spin_lock_init(&edge->channels_lock); | |
1331 | ||
1332 | INIT_WORK(&edge->scan_work, qcom_channel_scan_worker); | |
1333 | INIT_WORK(&edge->state_work, qcom_channel_state_worker); | |
1334 | ||
1335 | edge->of_node = of_node_get(node); | |
1336 | ||
1337 | key = "qcom,smd-edge"; | |
1338 | ret = of_property_read_u32(node, key, &edge->edge_id); | |
1339 | if (ret) { | |
1340 | dev_err(dev, "edge missing %s property\n", key); | |
e69ee0cf | 1341 | goto put_node; |
53e2822e BA |
1342 | } |
1343 | ||
1344 | edge->remote_pid = QCOM_SMEM_HOST_ANY; | |
1345 | key = "qcom,remote-pid"; | |
1346 | of_property_read_u32(node, key, &edge->remote_pid); | |
1347 | ||
ab460a2e BA |
1348 | edge->mbox_client.dev = dev; |
1349 | edge->mbox_client.knows_txdone = true; | |
1350 | edge->mbox_chan = mbox_request_channel(&edge->mbox_client, 0); | |
1351 | if (IS_ERR(edge->mbox_chan)) { | |
e69ee0cf DC |
1352 | if (PTR_ERR(edge->mbox_chan) != -ENODEV) { |
1353 | ret = PTR_ERR(edge->mbox_chan); | |
1354 | goto put_node; | |
1355 | } | |
53e2822e | 1356 | |
ab460a2e | 1357 | edge->mbox_chan = NULL; |
53e2822e | 1358 | |
ab460a2e BA |
1359 | syscon_np = of_parse_phandle(node, "qcom,ipc", 0); |
1360 | if (!syscon_np) { | |
1361 | dev_err(dev, "no qcom,ipc node\n"); | |
e69ee0cf DC |
1362 | ret = -ENODEV; |
1363 | goto put_node; | |
ab460a2e | 1364 | } |
53e2822e | 1365 | |
ab460a2e | 1366 | edge->ipc_regmap = syscon_node_to_regmap(syscon_np); |
e69ee0cf DC |
1367 | if (IS_ERR(edge->ipc_regmap)) { |
1368 | ret = PTR_ERR(edge->ipc_regmap); | |
1369 | goto put_node; | |
1370 | } | |
ab460a2e BA |
1371 | |
1372 | key = "qcom,ipc"; | |
1373 | ret = of_property_read_u32_index(node, key, 1, &edge->ipc_offset); | |
1374 | if (ret < 0) { | |
1375 | dev_err(dev, "no offset in %s\n", key); | |
e69ee0cf | 1376 | goto put_node; |
ab460a2e BA |
1377 | } |
1378 | ||
1379 | ret = of_property_read_u32_index(node, key, 2, &edge->ipc_bit); | |
1380 | if (ret < 0) { | |
1381 | dev_err(dev, "no bit in %s\n", key); | |
e69ee0cf | 1382 | goto put_node; |
ab460a2e | 1383 | } |
53e2822e BA |
1384 | } |
1385 | ||
5e53c42c BA |
1386 | ret = of_property_read_string(node, "label", &edge->name); |
1387 | if (ret < 0) | |
1388 | edge->name = node->name; | |
1389 | ||
53e2822e BA |
1390 | irq = irq_of_parse_and_map(node, 0); |
1391 | if (irq < 0) { | |
1392 | dev_err(dev, "required smd interrupt missing\n"); | |
e69ee0cf DC |
1393 | ret = irq; |
1394 | goto put_node; | |
53e2822e BA |
1395 | } |
1396 | ||
1397 | ret = devm_request_irq(dev, irq, | |
1398 | qcom_smd_edge_intr, IRQF_TRIGGER_RISING, | |
1399 | node->name, edge); | |
1400 | if (ret) { | |
1401 | dev_err(dev, "failed to request smd irq\n"); | |
e69ee0cf | 1402 | goto put_node; |
53e2822e BA |
1403 | } |
1404 | ||
1405 | edge->irq = irq; | |
1406 | ||
1407 | return 0; | |
e69ee0cf DC |
1408 | |
1409 | put_node: | |
1410 | of_node_put(node); | |
1411 | edge->of_node = NULL; | |
1412 | ||
1413 | return ret; | |
53e2822e BA |
1414 | } |
1415 | ||
1416 | /* | |
1417 | * Release function for an edge. | |
1418 | * Reset the state of each associated channel and free the edge context. | |
1419 | */ | |
1420 | static void qcom_smd_edge_release(struct device *dev) | |
1421 | { | |
4a2e84c6 | 1422 | struct qcom_smd_channel *channel, *tmp; |
53e2822e BA |
1423 | struct qcom_smd_edge *edge = to_smd_edge(dev); |
1424 | ||
4a2e84c6 SK |
1425 | list_for_each_entry_safe(channel, tmp, &edge->channels, list) { |
1426 | list_del(&channel->list); | |
1427 | kfree(channel->name); | |
1428 | kfree(channel); | |
53e2822e BA |
1429 | } |
1430 | ||
1431 | kfree(edge); | |
1432 | } | |
1433 | ||
5e53c42c BA |
1434 | static ssize_t rpmsg_name_show(struct device *dev, |
1435 | struct device_attribute *attr, char *buf) | |
1436 | { | |
1437 | struct qcom_smd_edge *edge = to_smd_edge(dev); | |
1438 | ||
1439 | return sprintf(buf, "%s\n", edge->name); | |
1440 | } | |
1441 | static DEVICE_ATTR_RO(rpmsg_name); | |
1442 | ||
1443 | static struct attribute *qcom_smd_edge_attrs[] = { | |
1444 | &dev_attr_rpmsg_name.attr, | |
1445 | NULL | |
1446 | }; | |
1447 | ATTRIBUTE_GROUPS(qcom_smd_edge); | |
1448 | ||
53e2822e BA |
1449 | /** |
1450 | * qcom_smd_register_edge() - register an edge based on an device_node | |
1451 | * @parent: parent device for the edge | |
1452 | * @node: device_node describing the edge | |
1453 | * | |
1454 | * Returns an edge reference, or negative ERR_PTR() on failure. | |
1455 | */ | |
1456 | struct qcom_smd_edge *qcom_smd_register_edge(struct device *parent, | |
1457 | struct device_node *node) | |
1458 | { | |
1459 | struct qcom_smd_edge *edge; | |
1460 | int ret; | |
1461 | ||
1462 | edge = kzalloc(sizeof(*edge), GFP_KERNEL); | |
1463 | if (!edge) | |
1464 | return ERR_PTR(-ENOMEM); | |
1465 | ||
1466 | init_waitqueue_head(&edge->new_channel_event); | |
1467 | ||
1468 | edge->dev.parent = parent; | |
1469 | edge->dev.release = qcom_smd_edge_release; | |
aaafb24e | 1470 | edge->dev.of_node = node; |
5e53c42c | 1471 | edge->dev.groups = qcom_smd_edge_groups; |
c8a54c0c | 1472 | dev_set_name(&edge->dev, "%s:%pOFn", dev_name(parent), node); |
53e2822e BA |
1473 | ret = device_register(&edge->dev); |
1474 | if (ret) { | |
1475 | pr_err("failed to register smd edge\n"); | |
be5acd24 | 1476 | put_device(&edge->dev); |
53e2822e BA |
1477 | return ERR_PTR(ret); |
1478 | } | |
1479 | ||
1480 | ret = qcom_smd_parse_edge(&edge->dev, node, edge); | |
1481 | if (ret) { | |
1482 | dev_err(&edge->dev, "failed to parse smd edge\n"); | |
1483 | goto unregister_dev; | |
1484 | } | |
1485 | ||
0be363bf BA |
1486 | ret = qcom_smd_create_chrdev(edge); |
1487 | if (ret) { | |
1488 | dev_err(&edge->dev, "failed to register chrdev for edge\n"); | |
1489 | goto unregister_dev; | |
1490 | } | |
1491 | ||
53e2822e BA |
1492 | schedule_work(&edge->scan_work); |
1493 | ||
1494 | return edge; | |
1495 | ||
1496 | unregister_dev: | |
ab460a2e BA |
1497 | if (!IS_ERR_OR_NULL(edge->mbox_chan)) |
1498 | mbox_free_channel(edge->mbox_chan); | |
1499 | ||
be5acd24 | 1500 | device_unregister(&edge->dev); |
53e2822e BA |
1501 | return ERR_PTR(ret); |
1502 | } | |
1503 | EXPORT_SYMBOL(qcom_smd_register_edge); | |
1504 | ||
1505 | static int qcom_smd_remove_device(struct device *dev, void *data) | |
1506 | { | |
1507 | device_unregister(dev); | |
1508 | ||
1509 | return 0; | |
1510 | } | |
1511 | ||
1512 | /** | |
1513 | * qcom_smd_unregister_edge() - release an edge and its children | |
1514 | * @edge: edge reference acquired from qcom_smd_register_edge | |
1515 | */ | |
1516 | int qcom_smd_unregister_edge(struct qcom_smd_edge *edge) | |
1517 | { | |
1518 | int ret; | |
1519 | ||
1520 | disable_irq(edge->irq); | |
1521 | cancel_work_sync(&edge->scan_work); | |
1522 | cancel_work_sync(&edge->state_work); | |
1523 | ||
1524 | ret = device_for_each_child(&edge->dev, NULL, qcom_smd_remove_device); | |
1525 | if (ret) | |
1526 | dev_warn(&edge->dev, "can't remove smd device: %d\n", ret); | |
1527 | ||
ab460a2e | 1528 | mbox_free_channel(edge->mbox_chan); |
53e2822e BA |
1529 | device_unregister(&edge->dev); |
1530 | ||
1531 | return 0; | |
1532 | } | |
1533 | EXPORT_SYMBOL(qcom_smd_unregister_edge); | |
1534 | ||
1535 | static int qcom_smd_probe(struct platform_device *pdev) | |
1536 | { | |
1537 | struct device_node *node; | |
1538 | void *p; | |
1539 | ||
1540 | /* Wait for smem */ | |
1541 | p = qcom_smem_get(QCOM_SMEM_HOST_ANY, smem_items[0].alloc_tbl_id, NULL); | |
1542 | if (PTR_ERR(p) == -EPROBE_DEFER) | |
1543 | return PTR_ERR(p); | |
1544 | ||
1545 | for_each_available_child_of_node(pdev->dev.of_node, node) | |
1546 | qcom_smd_register_edge(&pdev->dev, node); | |
1547 | ||
1548 | return 0; | |
1549 | } | |
1550 | ||
1551 | static int qcom_smd_remove_edge(struct device *dev, void *data) | |
1552 | { | |
1553 | struct qcom_smd_edge *edge = to_smd_edge(dev); | |
1554 | ||
1555 | return qcom_smd_unregister_edge(edge); | |
1556 | } | |
1557 | ||
1558 | /* | |
1559 | * Shut down all smd clients by making sure that each edge stops processing | |
1560 | * events and scanning for new channels, then call destroy on the devices. | |
1561 | */ | |
1562 | static int qcom_smd_remove(struct platform_device *pdev) | |
1563 | { | |
1564 | int ret; | |
1565 | ||
1566 | ret = device_for_each_child(&pdev->dev, NULL, qcom_smd_remove_edge); | |
1567 | if (ret) | |
1568 | dev_warn(&pdev->dev, "can't remove smd device: %d\n", ret); | |
1569 | ||
1570 | return ret; | |
1571 | } | |
1572 | ||
1573 | static const struct of_device_id qcom_smd_of_match[] = { | |
1574 | { .compatible = "qcom,smd" }, | |
1575 | {} | |
1576 | }; | |
1577 | MODULE_DEVICE_TABLE(of, qcom_smd_of_match); | |
1578 | ||
1579 | static struct platform_driver qcom_smd_driver = { | |
1580 | .probe = qcom_smd_probe, | |
1581 | .remove = qcom_smd_remove, | |
1582 | .driver = { | |
1583 | .name = "qcom-smd", | |
1584 | .of_match_table = qcom_smd_of_match, | |
1585 | }, | |
1586 | }; | |
1587 | ||
1588 | static int __init qcom_smd_init(void) | |
1589 | { | |
1590 | return platform_driver_register(&qcom_smd_driver); | |
1591 | } | |
1592 | subsys_initcall(qcom_smd_init); | |
1593 | ||
1594 | static void __exit qcom_smd_exit(void) | |
1595 | { | |
1596 | platform_driver_unregister(&qcom_smd_driver); | |
1597 | } | |
1598 | module_exit(qcom_smd_exit); | |
1599 | ||
1600 | MODULE_AUTHOR("Bjorn Andersson <bjorn.andersson@sonymobile.com>"); | |
1601 | MODULE_DESCRIPTION("Qualcomm Shared Memory Driver"); | |
1602 | MODULE_LICENSE("GPL v2"); |