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1 | /* |
2 | * Copyright (c) 2016-2017, Linaro Ltd | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License version 2 and | |
6 | * only version 2 as published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, | |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
11 | * GNU General Public License for more details. | |
12 | */ | |
13 | ||
14 | #include <linux/idr.h> | |
15 | #include <linux/interrupt.h> | |
16 | #include <linux/io.h> | |
17 | #include <linux/list.h> | |
18 | #include <linux/mfd/syscon.h> | |
19 | #include <linux/module.h> | |
20 | #include <linux/of.h> | |
21 | #include <linux/of_address.h> | |
22 | #include <linux/platform_device.h> | |
23 | #include <linux/regmap.h> | |
24 | #include <linux/rpmsg.h> | |
25 | #include <linux/slab.h> | |
26 | #include <linux/workqueue.h> | |
27 | #include <linux/mailbox_client.h> | |
28 | ||
29 | #include "rpmsg_internal.h" | |
30 | ||
31 | #define RPM_TOC_SIZE 256 | |
32 | #define RPM_TOC_MAGIC 0x67727430 /* grt0 */ | |
33 | #define RPM_TOC_MAX_ENTRIES ((RPM_TOC_SIZE - sizeof(struct rpm_toc)) / \ | |
34 | sizeof(struct rpm_toc_entry)) | |
35 | ||
36 | #define RPM_TX_FIFO_ID 0x61703272 /* ap2r */ | |
37 | #define RPM_RX_FIFO_ID 0x72326170 /* r2ap */ | |
38 | ||
39 | #define GLINK_NAME_SIZE 32 | |
40 | ||
41 | #define RPM_GLINK_CID_MIN 1 | |
42 | #define RPM_GLINK_CID_MAX 65536 | |
43 | ||
44 | struct rpm_toc_entry { | |
45 | __le32 id; | |
46 | __le32 offset; | |
47 | __le32 size; | |
48 | } __packed; | |
49 | ||
50 | struct rpm_toc { | |
51 | __le32 magic; | |
52 | __le32 count; | |
53 | ||
54 | struct rpm_toc_entry entries[]; | |
55 | } __packed; | |
56 | ||
57 | struct glink_msg { | |
58 | __le16 cmd; | |
59 | __le16 param1; | |
60 | __le32 param2; | |
61 | u8 data[]; | |
62 | } __packed; | |
63 | ||
64 | struct glink_rpm_pipe { | |
65 | void __iomem *tail; | |
66 | void __iomem *head; | |
67 | ||
68 | void __iomem *fifo; | |
69 | ||
70 | size_t length; | |
71 | }; | |
72 | ||
73 | /** | |
74 | * struct glink_defer_cmd - deferred incoming control message | |
75 | * @node: list node | |
76 | * @msg: message header | |
77 | * data: payload of the message | |
78 | * | |
79 | * Copy of a received control message, to be added to @rx_queue and processed | |
80 | * by @rx_work of @glink_rpm. | |
81 | */ | |
82 | struct glink_defer_cmd { | |
83 | struct list_head node; | |
84 | ||
85 | struct glink_msg msg; | |
86 | u8 data[]; | |
87 | }; | |
88 | ||
89 | /** | |
90 | * struct glink_rpm - driver context, relates to one remote subsystem | |
91 | * @dev: reference to the associated struct device | |
92 | * @doorbell: "rpm_hlos" ipc doorbell | |
93 | * @rx_pipe: pipe object for receive FIFO | |
94 | * @tx_pipe: pipe object for transmit FIFO | |
95 | * @irq: IRQ for signaling incoming events | |
96 | * @rx_work: worker for handling received control messages | |
97 | * @rx_lock: protects the @rx_queue | |
98 | * @rx_queue: queue of received control messages to be processed in @rx_work | |
99 | * @tx_lock: synchronizes operations on the tx fifo | |
100 | * @idr_lock: synchronizes @lcids and @rcids modifications | |
101 | * @lcids: idr of all channels with a known local channel id | |
102 | * @rcids: idr of all channels with a known remote channel id | |
103 | */ | |
104 | struct glink_rpm { | |
105 | struct device *dev; | |
106 | ||
107 | struct mbox_client mbox_client; | |
108 | struct mbox_chan *mbox_chan; | |
109 | ||
110 | struct glink_rpm_pipe rx_pipe; | |
111 | struct glink_rpm_pipe tx_pipe; | |
112 | ||
113 | int irq; | |
114 | ||
115 | struct work_struct rx_work; | |
116 | spinlock_t rx_lock; | |
117 | struct list_head rx_queue; | |
118 | ||
119 | struct mutex tx_lock; | |
120 | ||
121 | struct mutex idr_lock; | |
122 | struct idr lcids; | |
123 | struct idr rcids; | |
124 | }; | |
125 | ||
126 | enum { | |
127 | GLINK_STATE_CLOSED, | |
128 | GLINK_STATE_OPENING, | |
129 | GLINK_STATE_OPEN, | |
130 | GLINK_STATE_CLOSING, | |
131 | }; | |
132 | ||
133 | /** | |
134 | * struct glink_channel - internal representation of a channel | |
135 | * @rpdev: rpdev reference, only used for primary endpoints | |
136 | * @ept: rpmsg endpoint this channel is associated with | |
137 | * @glink: glink_rpm context handle | |
138 | * @refcount: refcount for the channel object | |
139 | * @recv_lock: guard for @ept.cb | |
140 | * @name: unique channel name/identifier | |
141 | * @lcid: channel id, in local space | |
142 | * @rcid: channel id, in remote space | |
143 | * @buf: receive buffer, for gathering fragments | |
144 | * @buf_offset: write offset in @buf | |
145 | * @buf_size: size of current @buf | |
146 | * @open_ack: completed once remote has acked the open-request | |
147 | * @open_req: completed once open-request has been received | |
148 | */ | |
149 | struct glink_channel { | |
150 | struct rpmsg_endpoint ept; | |
151 | ||
152 | struct rpmsg_device *rpdev; | |
153 | struct glink_rpm *glink; | |
154 | ||
155 | struct kref refcount; | |
156 | ||
157 | spinlock_t recv_lock; | |
158 | ||
159 | char *name; | |
160 | unsigned int lcid; | |
161 | unsigned int rcid; | |
162 | ||
163 | void *buf; | |
164 | int buf_offset; | |
165 | int buf_size; | |
166 | ||
167 | struct completion open_ack; | |
168 | struct completion open_req; | |
169 | }; | |
170 | ||
171 | #define to_glink_channel(_ept) container_of(_ept, struct glink_channel, ept) | |
172 | ||
173 | static const struct rpmsg_endpoint_ops glink_endpoint_ops; | |
174 | ||
175 | #define RPM_CMD_VERSION 0 | |
176 | #define RPM_CMD_VERSION_ACK 1 | |
177 | #define RPM_CMD_OPEN 2 | |
178 | #define RPM_CMD_CLOSE 3 | |
179 | #define RPM_CMD_OPEN_ACK 4 | |
180 | #define RPM_CMD_TX_DATA 9 | |
181 | #define RPM_CMD_CLOSE_ACK 11 | |
182 | #define RPM_CMD_TX_DATA_CONT 12 | |
183 | #define RPM_CMD_READ_NOTIF 13 | |
184 | ||
185 | #define GLINK_FEATURE_INTENTLESS BIT(1) | |
186 | ||
187 | static struct glink_channel *glink_rpm_alloc_channel(struct glink_rpm *glink, | |
188 | const char *name) | |
189 | { | |
190 | struct glink_channel *channel; | |
191 | ||
192 | channel = kzalloc(sizeof(*channel), GFP_KERNEL); | |
193 | if (!channel) | |
194 | return ERR_PTR(-ENOMEM); | |
195 | ||
196 | /* Setup glink internal glink_channel data */ | |
197 | spin_lock_init(&channel->recv_lock); | |
198 | channel->glink = glink; | |
199 | channel->name = kstrdup(name, GFP_KERNEL); | |
200 | ||
201 | init_completion(&channel->open_req); | |
202 | init_completion(&channel->open_ack); | |
203 | ||
204 | kref_init(&channel->refcount); | |
205 | ||
206 | return channel; | |
207 | } | |
208 | ||
209 | static void glink_rpm_channel_release(struct kref *ref) | |
210 | { | |
211 | struct glink_channel *channel = container_of(ref, struct glink_channel, | |
212 | refcount); | |
213 | ||
214 | kfree(channel->name); | |
215 | kfree(channel); | |
216 | } | |
217 | ||
218 | static size_t glink_rpm_rx_avail(struct glink_rpm *glink) | |
219 | { | |
220 | struct glink_rpm_pipe *pipe = &glink->rx_pipe; | |
221 | unsigned int head; | |
222 | unsigned int tail; | |
223 | ||
224 | head = readl(pipe->head); | |
225 | tail = readl(pipe->tail); | |
226 | ||
227 | if (head < tail) | |
228 | return pipe->length - tail + head; | |
229 | else | |
230 | return head - tail; | |
231 | } | |
232 | ||
233 | static void glink_rpm_rx_peak(struct glink_rpm *glink, | |
234 | void *data, size_t count) | |
235 | { | |
236 | struct glink_rpm_pipe *pipe = &glink->rx_pipe; | |
237 | unsigned int tail; | |
238 | size_t len; | |
239 | ||
240 | tail = readl(pipe->tail); | |
241 | ||
242 | len = min_t(size_t, count, pipe->length - tail); | |
243 | if (len) { | |
244 | __ioread32_copy(data, pipe->fifo + tail, | |
245 | len / sizeof(u32)); | |
246 | } | |
247 | ||
248 | if (len != count) { | |
249 | __ioread32_copy(data + len, pipe->fifo, | |
250 | (count - len) / sizeof(u32)); | |
251 | } | |
252 | } | |
253 | ||
254 | static void glink_rpm_rx_advance(struct glink_rpm *glink, | |
255 | size_t count) | |
256 | { | |
257 | struct glink_rpm_pipe *pipe = &glink->rx_pipe; | |
258 | unsigned int tail; | |
259 | ||
260 | tail = readl(pipe->tail); | |
261 | ||
262 | tail += count; | |
263 | if (tail >= pipe->length) | |
264 | tail -= pipe->length; | |
265 | ||
266 | writel(tail, pipe->tail); | |
267 | } | |
268 | ||
269 | static size_t glink_rpm_tx_avail(struct glink_rpm *glink) | |
270 | { | |
271 | struct glink_rpm_pipe *pipe = &glink->tx_pipe; | |
272 | unsigned int head; | |
273 | unsigned int tail; | |
274 | ||
275 | head = readl(pipe->head); | |
276 | tail = readl(pipe->tail); | |
277 | ||
278 | if (tail <= head) | |
279 | return pipe->length - head + tail; | |
280 | else | |
281 | return tail - head; | |
282 | } | |
283 | ||
284 | static unsigned int glink_rpm_tx_write(struct glink_rpm *glink, | |
285 | unsigned int head, | |
286 | const void *data, size_t count) | |
287 | { | |
288 | struct glink_rpm_pipe *pipe = &glink->tx_pipe; | |
289 | size_t len; | |
290 | ||
291 | len = min_t(size_t, count, pipe->length - head); | |
292 | if (len) { | |
293 | __iowrite32_copy(pipe->fifo + head, data, | |
294 | len / sizeof(u32)); | |
295 | } | |
296 | ||
297 | if (len != count) { | |
298 | __iowrite32_copy(pipe->fifo, data + len, | |
299 | (count - len) / sizeof(u32)); | |
300 | } | |
301 | ||
302 | head += count; | |
303 | if (head >= pipe->length) | |
304 | head -= pipe->length; | |
305 | ||
306 | return head; | |
307 | } | |
308 | ||
309 | static int glink_rpm_tx(struct glink_rpm *glink, | |
310 | const void *hdr, size_t hlen, | |
311 | const void *data, size_t dlen, bool wait) | |
312 | { | |
313 | struct glink_rpm_pipe *pipe = &glink->tx_pipe; | |
314 | unsigned int head; | |
315 | unsigned int tlen = hlen + dlen; | |
316 | int ret; | |
317 | ||
318 | /* Reject packets that are too big */ | |
319 | if (tlen >= glink->tx_pipe.length) | |
320 | return -EINVAL; | |
321 | ||
322 | if (WARN(tlen % 8, "Unaligned TX request")) | |
323 | return -EINVAL; | |
324 | ||
325 | ret = mutex_lock_interruptible(&glink->tx_lock); | |
326 | if (ret) | |
327 | return ret; | |
328 | ||
329 | while (glink_rpm_tx_avail(glink) < tlen) { | |
330 | if (!wait) { | |
331 | ret = -ENOMEM; | |
332 | goto out; | |
333 | } | |
334 | ||
335 | msleep(10); | |
336 | } | |
337 | ||
338 | head = readl(pipe->head); | |
339 | head = glink_rpm_tx_write(glink, head, hdr, hlen); | |
340 | head = glink_rpm_tx_write(glink, head, data, dlen); | |
341 | writel(head, pipe->head); | |
342 | ||
343 | mbox_send_message(glink->mbox_chan, NULL); | |
344 | mbox_client_txdone(glink->mbox_chan, 0); | |
345 | ||
346 | out: | |
347 | mutex_unlock(&glink->tx_lock); | |
348 | ||
349 | return ret; | |
350 | } | |
351 | ||
352 | static int glink_rpm_send_version(struct glink_rpm *glink) | |
353 | { | |
354 | struct glink_msg msg; | |
355 | ||
356 | msg.cmd = cpu_to_le16(RPM_CMD_VERSION); | |
357 | msg.param1 = cpu_to_le16(1); | |
358 | msg.param2 = cpu_to_le32(GLINK_FEATURE_INTENTLESS); | |
359 | ||
360 | return glink_rpm_tx(glink, &msg, sizeof(msg), NULL, 0, true); | |
361 | } | |
362 | ||
363 | static void glink_rpm_send_version_ack(struct glink_rpm *glink) | |
364 | { | |
365 | struct glink_msg msg; | |
366 | ||
367 | msg.cmd = cpu_to_le16(RPM_CMD_VERSION_ACK); | |
368 | msg.param1 = cpu_to_le16(1); | |
369 | msg.param2 = cpu_to_le32(0); | |
370 | ||
371 | glink_rpm_tx(glink, &msg, sizeof(msg), NULL, 0, true); | |
372 | } | |
373 | ||
374 | static void glink_rpm_send_open_ack(struct glink_rpm *glink, | |
375 | struct glink_channel *channel) | |
376 | { | |
377 | struct glink_msg msg; | |
378 | ||
379 | msg.cmd = cpu_to_le16(RPM_CMD_OPEN_ACK); | |
380 | msg.param1 = cpu_to_le16(channel->rcid); | |
381 | msg.param2 = cpu_to_le32(0); | |
382 | ||
383 | glink_rpm_tx(glink, &msg, sizeof(msg), NULL, 0, true); | |
384 | } | |
385 | ||
386 | /** | |
387 | * glink_rpm_send_open_req() - send a RPM_CMD_OPEN request to the remote | |
388 | * @glink: | |
389 | * @channel: | |
390 | * | |
391 | * Allocates a local channel id and sends a RPM_CMD_OPEN message to the remote. | |
392 | * Will return with refcount held, regardless of outcome. | |
393 | * | |
394 | * Returns 0 on success, negative errno otherwise. | |
395 | */ | |
396 | static int glink_rpm_send_open_req(struct glink_rpm *glink, | |
397 | struct glink_channel *channel) | |
398 | { | |
399 | struct { | |
400 | struct glink_msg msg; | |
401 | u8 name[GLINK_NAME_SIZE]; | |
402 | } __packed req; | |
403 | int name_len = strlen(channel->name) + 1; | |
404 | int req_len = ALIGN(sizeof(req.msg) + name_len, 8); | |
405 | int ret; | |
406 | ||
407 | kref_get(&channel->refcount); | |
408 | ||
409 | mutex_lock(&glink->idr_lock); | |
410 | ret = idr_alloc_cyclic(&glink->lcids, channel, | |
411 | RPM_GLINK_CID_MIN, RPM_GLINK_CID_MAX, GFP_KERNEL); | |
412 | mutex_unlock(&glink->idr_lock); | |
413 | if (ret < 0) | |
414 | return ret; | |
415 | ||
416 | channel->lcid = ret; | |
417 | ||
418 | req.msg.cmd = cpu_to_le16(RPM_CMD_OPEN); | |
419 | req.msg.param1 = cpu_to_le16(channel->lcid); | |
420 | req.msg.param2 = cpu_to_le32(name_len); | |
421 | strcpy(req.name, channel->name); | |
422 | ||
423 | ret = glink_rpm_tx(glink, &req, req_len, NULL, 0, true); | |
424 | if (ret) | |
425 | goto remove_idr; | |
426 | ||
427 | return 0; | |
428 | ||
429 | remove_idr: | |
430 | mutex_lock(&glink->idr_lock); | |
431 | idr_remove(&glink->lcids, channel->lcid); | |
432 | channel->lcid = 0; | |
433 | mutex_unlock(&glink->idr_lock); | |
434 | ||
435 | return ret; | |
436 | } | |
437 | ||
438 | static void glink_rpm_send_close_req(struct glink_rpm *glink, | |
439 | struct glink_channel *channel) | |
440 | { | |
441 | struct glink_msg req; | |
442 | ||
443 | req.cmd = cpu_to_le16(RPM_CMD_CLOSE); | |
444 | req.param1 = cpu_to_le16(channel->lcid); | |
445 | req.param2 = 0; | |
446 | ||
447 | glink_rpm_tx(glink, &req, sizeof(req), NULL, 0, true); | |
448 | } | |
449 | ||
450 | static void glink_rpm_send_close_ack(struct glink_rpm *glink, unsigned int rcid) | |
451 | { | |
452 | struct glink_msg req; | |
453 | ||
454 | req.cmd = cpu_to_le16(RPM_CMD_CLOSE_ACK); | |
455 | req.param1 = cpu_to_le16(rcid); | |
456 | req.param2 = 0; | |
457 | ||
458 | glink_rpm_tx(glink, &req, sizeof(req), NULL, 0, true); | |
459 | } | |
460 | ||
461 | static int glink_rpm_rx_defer(struct glink_rpm *glink, size_t extra) | |
462 | { | |
463 | struct glink_defer_cmd *dcmd; | |
464 | ||
465 | extra = ALIGN(extra, 8); | |
466 | ||
467 | if (glink_rpm_rx_avail(glink) < sizeof(struct glink_msg) + extra) { | |
468 | dev_dbg(glink->dev, "Insufficient data in rx fifo"); | |
469 | return -ENXIO; | |
470 | } | |
471 | ||
472 | dcmd = kzalloc(sizeof(*dcmd) + extra, GFP_ATOMIC); | |
473 | if (!dcmd) | |
474 | return -ENOMEM; | |
475 | ||
476 | INIT_LIST_HEAD(&dcmd->node); | |
477 | ||
478 | glink_rpm_rx_peak(glink, &dcmd->msg, sizeof(dcmd->msg) + extra); | |
479 | ||
480 | spin_lock(&glink->rx_lock); | |
481 | list_add_tail(&dcmd->node, &glink->rx_queue); | |
482 | spin_unlock(&glink->rx_lock); | |
483 | ||
484 | schedule_work(&glink->rx_work); | |
485 | glink_rpm_rx_advance(glink, sizeof(dcmd->msg) + extra); | |
486 | ||
487 | return 0; | |
488 | } | |
489 | ||
490 | static int glink_rpm_rx_data(struct glink_rpm *glink, size_t avail) | |
491 | { | |
492 | struct glink_channel *channel; | |
493 | struct { | |
494 | struct glink_msg msg; | |
495 | __le32 chunk_size; | |
496 | __le32 left_size; | |
497 | } __packed hdr; | |
498 | unsigned int chunk_size; | |
499 | unsigned int left_size; | |
500 | unsigned int rcid; | |
501 | ||
502 | if (avail < sizeof(hdr)) { | |
503 | dev_dbg(glink->dev, "Not enough data in fifo\n"); | |
504 | return -EAGAIN; | |
505 | } | |
506 | ||
507 | glink_rpm_rx_peak(glink, &hdr, sizeof(hdr)); | |
508 | chunk_size = le32_to_cpu(hdr.chunk_size); | |
509 | left_size = le32_to_cpu(hdr.left_size); | |
510 | ||
511 | if (avail < sizeof(hdr) + chunk_size) { | |
512 | dev_dbg(glink->dev, "Payload not yet in fifo\n"); | |
513 | return -EAGAIN; | |
514 | } | |
515 | ||
516 | if (WARN(chunk_size % 4, "Incoming data must be word aligned\n")) | |
517 | return -EINVAL; | |
518 | ||
519 | rcid = le16_to_cpu(hdr.msg.param1); | |
520 | channel = idr_find(&glink->rcids, rcid); | |
521 | if (!channel) { | |
522 | dev_dbg(glink->dev, "Data on non-existing channel\n"); | |
523 | ||
524 | /* Drop the message */ | |
525 | glink_rpm_rx_advance(glink, ALIGN(sizeof(hdr) + chunk_size, 8)); | |
526 | return 0; | |
527 | } | |
528 | ||
529 | /* Might have an ongoing, fragmented, message to append */ | |
530 | if (!channel->buf) { | |
531 | channel->buf = kmalloc(chunk_size + left_size, GFP_ATOMIC); | |
532 | if (!channel->buf) | |
533 | return -ENOMEM; | |
534 | ||
535 | channel->buf_size = chunk_size + left_size; | |
536 | channel->buf_offset = 0; | |
537 | } | |
538 | ||
539 | glink_rpm_rx_advance(glink, sizeof(hdr)); | |
540 | ||
541 | if (channel->buf_size - channel->buf_offset < chunk_size) { | |
542 | dev_err(glink->dev, "Insufficient space in input buffer\n"); | |
543 | ||
544 | /* The packet header lied, drop payload */ | |
545 | glink_rpm_rx_advance(glink, chunk_size); | |
546 | return -ENOMEM; | |
547 | } | |
548 | ||
549 | glink_rpm_rx_peak(glink, channel->buf + channel->buf_offset, chunk_size); | |
550 | channel->buf_offset += chunk_size; | |
551 | ||
552 | /* Handle message when no fragments remain to be received */ | |
553 | if (!left_size) { | |
554 | spin_lock(&channel->recv_lock); | |
555 | if (channel->ept.cb) { | |
556 | channel->ept.cb(channel->ept.rpdev, | |
557 | channel->buf, | |
558 | channel->buf_offset, | |
559 | channel->ept.priv, | |
560 | RPMSG_ADDR_ANY); | |
561 | } | |
562 | spin_unlock(&channel->recv_lock); | |
563 | ||
564 | kfree(channel->buf); | |
565 | channel->buf = NULL; | |
566 | channel->buf_size = 0; | |
567 | } | |
568 | ||
569 | /* Each message starts at 8 byte aligned address */ | |
570 | glink_rpm_rx_advance(glink, ALIGN(chunk_size, 8)); | |
571 | ||
572 | return 0; | |
573 | } | |
574 | ||
575 | static int glink_rpm_rx_open_ack(struct glink_rpm *glink, unsigned int lcid) | |
576 | { | |
577 | struct glink_channel *channel; | |
578 | ||
579 | channel = idr_find(&glink->lcids, lcid); | |
580 | if (!channel) { | |
581 | dev_err(glink->dev, "Invalid open ack packet\n"); | |
582 | return -EINVAL; | |
583 | } | |
584 | ||
585 | complete(&channel->open_ack); | |
586 | ||
587 | return 0; | |
588 | } | |
589 | ||
590 | static irqreturn_t glink_rpm_intr(int irq, void *data) | |
591 | { | |
592 | struct glink_rpm *glink = data; | |
593 | struct glink_msg msg; | |
594 | unsigned int param1; | |
595 | unsigned int param2; | |
596 | unsigned int avail; | |
597 | unsigned int cmd; | |
598 | int ret; | |
599 | ||
600 | for (;;) { | |
601 | avail = glink_rpm_rx_avail(glink); | |
602 | if (avail < sizeof(msg)) | |
603 | break; | |
604 | ||
605 | glink_rpm_rx_peak(glink, &msg, sizeof(msg)); | |
606 | ||
607 | cmd = le16_to_cpu(msg.cmd); | |
608 | param1 = le16_to_cpu(msg.param1); | |
609 | param2 = le32_to_cpu(msg.param2); | |
610 | ||
611 | switch (cmd) { | |
612 | case RPM_CMD_VERSION: | |
613 | case RPM_CMD_VERSION_ACK: | |
614 | case RPM_CMD_CLOSE: | |
615 | case RPM_CMD_CLOSE_ACK: | |
616 | ret = glink_rpm_rx_defer(glink, 0); | |
617 | break; | |
618 | case RPM_CMD_OPEN_ACK: | |
619 | ret = glink_rpm_rx_open_ack(glink, param1); | |
620 | glink_rpm_rx_advance(glink, ALIGN(sizeof(msg), 8)); | |
621 | break; | |
622 | case RPM_CMD_OPEN: | |
623 | ret = glink_rpm_rx_defer(glink, param2); | |
624 | break; | |
625 | case RPM_CMD_TX_DATA: | |
626 | case RPM_CMD_TX_DATA_CONT: | |
627 | ret = glink_rpm_rx_data(glink, avail); | |
628 | break; | |
629 | case RPM_CMD_READ_NOTIF: | |
630 | glink_rpm_rx_advance(glink, ALIGN(sizeof(msg), 8)); | |
631 | ||
632 | mbox_send_message(glink->mbox_chan, NULL); | |
633 | mbox_client_txdone(glink->mbox_chan, 0); | |
634 | ||
635 | ret = 0; | |
636 | break; | |
637 | default: | |
638 | dev_err(glink->dev, "unhandled rx cmd: %d\n", cmd); | |
639 | ret = -EINVAL; | |
640 | break; | |
641 | } | |
642 | ||
643 | if (ret) | |
644 | break; | |
645 | } | |
646 | ||
647 | return IRQ_HANDLED; | |
648 | } | |
649 | ||
650 | /* Locally initiated rpmsg_create_ept */ | |
651 | static struct glink_channel *glink_rpm_create_local(struct glink_rpm *glink, | |
652 | const char *name) | |
653 | { | |
654 | struct glink_channel *channel; | |
655 | int ret; | |
656 | ||
657 | channel = glink_rpm_alloc_channel(glink, name); | |
658 | if (IS_ERR(channel)) | |
659 | return ERR_CAST(channel); | |
660 | ||
661 | ret = glink_rpm_send_open_req(glink, channel); | |
662 | if (ret) | |
663 | goto release_channel; | |
664 | ||
665 | ret = wait_for_completion_timeout(&channel->open_ack, 5 * HZ); | |
666 | if (!ret) | |
667 | goto err_timeout; | |
668 | ||
669 | ret = wait_for_completion_timeout(&channel->open_req, 5 * HZ); | |
670 | if (!ret) | |
671 | goto err_timeout; | |
672 | ||
673 | glink_rpm_send_open_ack(glink, channel); | |
674 | ||
675 | return channel; | |
676 | ||
677 | err_timeout: | |
678 | /* glink_rpm_send_open_req() did register the channel in lcids*/ | |
679 | mutex_lock(&glink->idr_lock); | |
680 | idr_remove(&glink->lcids, channel->lcid); | |
681 | mutex_unlock(&glink->idr_lock); | |
682 | ||
683 | release_channel: | |
684 | /* Release glink_rpm_send_open_req() reference */ | |
685 | kref_put(&channel->refcount, glink_rpm_channel_release); | |
686 | /* Release glink_rpm_alloc_channel() reference */ | |
687 | kref_put(&channel->refcount, glink_rpm_channel_release); | |
688 | ||
689 | return ERR_PTR(-ETIMEDOUT); | |
690 | } | |
691 | ||
692 | /* Remote initiated rpmsg_create_ept */ | |
693 | static int glink_rpm_create_remote(struct glink_rpm *glink, | |
694 | struct glink_channel *channel) | |
695 | { | |
696 | int ret; | |
697 | ||
698 | glink_rpm_send_open_ack(glink, channel); | |
699 | ||
700 | ret = glink_rpm_send_open_req(glink, channel); | |
701 | if (ret) | |
702 | goto close_link; | |
703 | ||
704 | ret = wait_for_completion_timeout(&channel->open_ack, 5 * HZ); | |
705 | if (!ret) { | |
706 | ret = -ETIMEDOUT; | |
707 | goto close_link; | |
708 | } | |
709 | ||
710 | return 0; | |
711 | ||
712 | close_link: | |
713 | /* | |
714 | * Send a close request to "undo" our open-ack. The close-ack will | |
715 | * release the last reference. | |
716 | */ | |
717 | glink_rpm_send_close_req(glink, channel); | |
718 | ||
719 | /* Release glink_rpm_send_open_req() reference */ | |
720 | kref_put(&channel->refcount, glink_rpm_channel_release); | |
721 | ||
722 | return ret; | |
723 | } | |
724 | ||
725 | static struct rpmsg_endpoint *glink_rpm_create_ept(struct rpmsg_device *rpdev, | |
726 | rpmsg_rx_cb_t cb, void *priv, | |
727 | struct rpmsg_channel_info chinfo) | |
728 | { | |
729 | struct glink_channel *parent = to_glink_channel(rpdev->ept); | |
730 | struct glink_channel *channel; | |
731 | struct glink_rpm *glink = parent->glink; | |
732 | struct rpmsg_endpoint *ept; | |
733 | const char *name = chinfo.name; | |
734 | int cid; | |
735 | int ret; | |
736 | ||
737 | idr_for_each_entry(&glink->rcids, channel, cid) { | |
738 | if (!strcmp(channel->name, name)) | |
739 | break; | |
740 | } | |
741 | ||
742 | if (!channel) { | |
743 | channel = glink_rpm_create_local(glink, name); | |
744 | if (IS_ERR(channel)) | |
745 | return NULL; | |
746 | } else { | |
747 | ret = glink_rpm_create_remote(glink, channel); | |
748 | if (ret) | |
749 | return NULL; | |
750 | } | |
751 | ||
752 | ept = &channel->ept; | |
753 | ept->rpdev = rpdev; | |
754 | ept->cb = cb; | |
755 | ept->priv = priv; | |
756 | ept->ops = &glink_endpoint_ops; | |
757 | ||
758 | return ept; | |
759 | } | |
760 | ||
761 | static void glink_rpm_destroy_ept(struct rpmsg_endpoint *ept) | |
762 | { | |
763 | struct glink_channel *channel = to_glink_channel(ept); | |
764 | struct glink_rpm *glink = channel->glink; | |
765 | unsigned long flags; | |
766 | ||
767 | spin_lock_irqsave(&channel->recv_lock, flags); | |
768 | channel->ept.cb = NULL; | |
769 | spin_unlock_irqrestore(&channel->recv_lock, flags); | |
770 | ||
771 | /* Decouple the potential rpdev from the channel */ | |
772 | channel->rpdev = NULL; | |
773 | ||
774 | glink_rpm_send_close_req(glink, channel); | |
775 | } | |
776 | ||
777 | static int __glink_rpm_send(struct glink_channel *channel, | |
778 | void *data, int len, bool wait) | |
779 | { | |
780 | struct glink_rpm *glink = channel->glink; | |
781 | struct { | |
782 | struct glink_msg msg; | |
783 | __le32 chunk_size; | |
784 | __le32 left_size; | |
785 | } __packed req; | |
786 | ||
787 | if (WARN(len % 8, "RPM GLINK expects 8 byte aligned messages\n")) | |
788 | return -EINVAL; | |
789 | ||
790 | req.msg.cmd = cpu_to_le16(RPM_CMD_TX_DATA); | |
791 | req.msg.param1 = cpu_to_le16(channel->lcid); | |
792 | req.msg.param2 = cpu_to_le32(channel->rcid); | |
793 | req.chunk_size = cpu_to_le32(len); | |
794 | req.left_size = cpu_to_le32(0); | |
795 | ||
796 | return glink_rpm_tx(glink, &req, sizeof(req), data, len, wait); | |
797 | } | |
798 | ||
799 | static int glink_rpm_send(struct rpmsg_endpoint *ept, void *data, int len) | |
800 | { | |
801 | struct glink_channel *channel = to_glink_channel(ept); | |
802 | ||
803 | return __glink_rpm_send(channel, data, len, true); | |
804 | } | |
805 | ||
806 | static int glink_rpm_trysend(struct rpmsg_endpoint *ept, void *data, int len) | |
807 | { | |
808 | struct glink_channel *channel = to_glink_channel(ept); | |
809 | ||
810 | return __glink_rpm_send(channel, data, len, false); | |
811 | } | |
812 | ||
813 | /* | |
814 | * Finds the device_node for the glink child interested in this channel. | |
815 | */ | |
816 | static struct device_node *glink_rpm_match_channel(struct device_node *node, | |
817 | const char *channel) | |
818 | { | |
819 | struct device_node *child; | |
820 | const char *name; | |
821 | const char *key; | |
822 | int ret; | |
823 | ||
824 | for_each_available_child_of_node(node, child) { | |
825 | key = "qcom,glink-channels"; | |
826 | ret = of_property_read_string(child, key, &name); | |
827 | if (ret) | |
828 | continue; | |
829 | ||
830 | if (strcmp(name, channel) == 0) | |
831 | return child; | |
832 | } | |
833 | ||
834 | return NULL; | |
835 | } | |
836 | ||
837 | static const struct rpmsg_device_ops glink_device_ops = { | |
838 | .create_ept = glink_rpm_create_ept, | |
839 | }; | |
840 | ||
841 | static const struct rpmsg_endpoint_ops glink_endpoint_ops = { | |
842 | .destroy_ept = glink_rpm_destroy_ept, | |
843 | .send = glink_rpm_send, | |
844 | .trysend = glink_rpm_trysend, | |
845 | }; | |
846 | ||
847 | static void glink_rpm_rpdev_release(struct device *dev) | |
848 | { | |
849 | struct rpmsg_device *rpdev = to_rpmsg_device(dev); | |
850 | struct glink_channel *channel = to_glink_channel(rpdev->ept); | |
851 | ||
852 | channel->rpdev = NULL; | |
853 | kfree(rpdev); | |
854 | } | |
855 | ||
856 | static int glink_rpm_rx_open(struct glink_rpm *glink, unsigned int rcid, | |
857 | char *name) | |
858 | { | |
859 | struct glink_channel *channel; | |
860 | struct rpmsg_device *rpdev; | |
861 | bool create_device = false; | |
862 | int lcid; | |
863 | int ret; | |
864 | ||
865 | idr_for_each_entry(&glink->lcids, channel, lcid) { | |
866 | if (!strcmp(channel->name, name)) | |
867 | break; | |
868 | } | |
869 | ||
870 | if (!channel) { | |
871 | channel = glink_rpm_alloc_channel(glink, name); | |
872 | if (IS_ERR(channel)) | |
873 | return PTR_ERR(channel); | |
874 | ||
875 | /* The opening dance was initiated by the remote */ | |
876 | create_device = true; | |
877 | } | |
878 | ||
879 | mutex_lock(&glink->idr_lock); | |
880 | ret = idr_alloc(&glink->rcids, channel, rcid, rcid + 1, GFP_KERNEL); | |
881 | if (ret < 0) { | |
882 | dev_err(glink->dev, "Unable to insert channel into rcid list\n"); | |
883 | mutex_unlock(&glink->idr_lock); | |
884 | goto free_channel; | |
885 | } | |
886 | channel->rcid = ret; | |
887 | mutex_unlock(&glink->idr_lock); | |
888 | ||
889 | complete(&channel->open_req); | |
890 | ||
891 | if (create_device) { | |
892 | rpdev = kzalloc(sizeof(*rpdev), GFP_KERNEL); | |
893 | if (!rpdev) { | |
894 | ret = -ENOMEM; | |
895 | goto rcid_remove; | |
896 | } | |
897 | ||
898 | rpdev->ept = &channel->ept; | |
899 | strncpy(rpdev->id.name, name, RPMSG_NAME_SIZE); | |
900 | rpdev->src = RPMSG_ADDR_ANY; | |
901 | rpdev->dst = RPMSG_ADDR_ANY; | |
902 | rpdev->ops = &glink_device_ops; | |
903 | ||
904 | rpdev->dev.of_node = glink_rpm_match_channel(glink->dev->of_node, name); | |
905 | rpdev->dev.parent = glink->dev; | |
906 | rpdev->dev.release = glink_rpm_rpdev_release; | |
907 | ||
908 | ret = rpmsg_register_device(rpdev); | |
909 | if (ret) | |
910 | goto free_rpdev; | |
911 | ||
912 | channel->rpdev = rpdev; | |
913 | } | |
914 | ||
915 | return 0; | |
916 | ||
917 | free_rpdev: | |
918 | kfree(rpdev); | |
919 | rcid_remove: | |
920 | mutex_lock(&glink->idr_lock); | |
921 | idr_remove(&glink->rcids, channel->rcid); | |
922 | channel->rcid = 0; | |
923 | mutex_unlock(&glink->idr_lock); | |
924 | free_channel: | |
925 | /* Release the reference, iff we took it */ | |
926 | if (create_device) | |
927 | kref_put(&channel->refcount, glink_rpm_channel_release); | |
928 | ||
929 | return ret; | |
930 | } | |
931 | ||
932 | static void glink_rpm_rx_close(struct glink_rpm *glink, unsigned int rcid) | |
933 | { | |
934 | struct rpmsg_channel_info chinfo; | |
935 | struct glink_channel *channel; | |
936 | ||
937 | channel = idr_find(&glink->rcids, rcid); | |
938 | if (WARN(!channel, "close request on unknown channel\n")) | |
939 | return; | |
940 | ||
941 | if (channel->rpdev) { | |
942 | strncpy(chinfo.name, channel->name, sizeof(chinfo.name)); | |
943 | chinfo.src = RPMSG_ADDR_ANY; | |
944 | chinfo.dst = RPMSG_ADDR_ANY; | |
945 | ||
946 | rpmsg_unregister_device(glink->dev, &chinfo); | |
947 | } | |
948 | ||
949 | glink_rpm_send_close_ack(glink, channel->rcid); | |
950 | ||
951 | mutex_lock(&glink->idr_lock); | |
952 | idr_remove(&glink->rcids, channel->rcid); | |
953 | channel->rcid = 0; | |
954 | mutex_unlock(&glink->idr_lock); | |
955 | ||
956 | kref_put(&channel->refcount, glink_rpm_channel_release); | |
957 | } | |
958 | ||
959 | static void glink_rpm_rx_close_ack(struct glink_rpm *glink, unsigned int lcid) | |
960 | { | |
961 | struct glink_channel *channel; | |
962 | ||
963 | channel = idr_find(&glink->lcids, lcid); | |
964 | if (WARN(!channel, "close ack on unknown channel\n")) | |
965 | return; | |
966 | ||
967 | mutex_lock(&glink->idr_lock); | |
968 | idr_remove(&glink->lcids, channel->lcid); | |
969 | channel->lcid = 0; | |
970 | mutex_unlock(&glink->idr_lock); | |
971 | ||
972 | kref_put(&channel->refcount, glink_rpm_channel_release); | |
973 | } | |
974 | ||
975 | static void glink_rpm_work(struct work_struct *work) | |
976 | { | |
977 | struct glink_rpm *glink = container_of(work, struct glink_rpm, rx_work); | |
978 | struct glink_defer_cmd *dcmd; | |
979 | struct glink_msg *msg; | |
980 | unsigned long flags; | |
981 | unsigned int param1; | |
982 | unsigned int param2; | |
983 | unsigned int cmd; | |
984 | ||
985 | for (;;) { | |
986 | spin_lock_irqsave(&glink->rx_lock, flags); | |
987 | if (list_empty(&glink->rx_queue)) { | |
988 | spin_unlock_irqrestore(&glink->rx_lock, flags); | |
989 | break; | |
990 | } | |
991 | dcmd = list_first_entry(&glink->rx_queue, struct glink_defer_cmd, node); | |
992 | list_del(&dcmd->node); | |
993 | spin_unlock_irqrestore(&glink->rx_lock, flags); | |
994 | ||
995 | msg = &dcmd->msg; | |
996 | cmd = le16_to_cpu(msg->cmd); | |
997 | param1 = le16_to_cpu(msg->param1); | |
998 | param2 = le32_to_cpu(msg->param2); | |
999 | ||
1000 | switch (cmd) { | |
1001 | case RPM_CMD_VERSION: | |
1002 | glink_rpm_send_version_ack(glink); | |
1003 | break; | |
1004 | case RPM_CMD_VERSION_ACK: | |
1005 | break; | |
1006 | case RPM_CMD_OPEN: | |
1007 | glink_rpm_rx_open(glink, param1, msg->data); | |
1008 | break; | |
1009 | case RPM_CMD_CLOSE: | |
1010 | glink_rpm_rx_close(glink, param1); | |
1011 | break; | |
1012 | case RPM_CMD_CLOSE_ACK: | |
1013 | glink_rpm_rx_close_ack(glink, param1); | |
1014 | break; | |
1015 | default: | |
1016 | WARN(1, "Unknown defer object %d\n", cmd); | |
1017 | break; | |
1018 | } | |
1019 | ||
1020 | kfree(dcmd); | |
1021 | } | |
1022 | } | |
1023 | ||
1024 | static int glink_rpm_parse_toc(struct device *dev, | |
1025 | void __iomem *msg_ram, | |
1026 | size_t msg_ram_size, | |
1027 | struct glink_rpm_pipe *rx, | |
1028 | struct glink_rpm_pipe *tx) | |
1029 | { | |
1030 | struct rpm_toc *toc; | |
1031 | int num_entries; | |
1032 | unsigned int id; | |
1033 | size_t offset; | |
1034 | size_t size; | |
1035 | void *buf; | |
1036 | int i; | |
1037 | ||
1038 | buf = kzalloc(RPM_TOC_SIZE, GFP_KERNEL); | |
1039 | if (!buf) | |
1040 | return -ENOMEM; | |
1041 | ||
1042 | __ioread32_copy(buf, msg_ram + msg_ram_size - RPM_TOC_SIZE, | |
1043 | RPM_TOC_SIZE / sizeof(u32)); | |
1044 | ||
1045 | toc = buf; | |
1046 | ||
1047 | if (le32_to_cpu(toc->magic) != RPM_TOC_MAGIC) { | |
1048 | dev_err(dev, "RPM TOC has invalid magic\n"); | |
1049 | goto err_inval; | |
1050 | } | |
1051 | ||
1052 | num_entries = le32_to_cpu(toc->count); | |
1053 | if (num_entries > RPM_TOC_MAX_ENTRIES) { | |
1054 | dev_err(dev, "Invalid number of toc entries\n"); | |
1055 | goto err_inval; | |
1056 | } | |
1057 | ||
1058 | for (i = 0; i < num_entries; i++) { | |
1059 | id = le32_to_cpu(toc->entries[i].id); | |
1060 | offset = le32_to_cpu(toc->entries[i].offset); | |
1061 | size = le32_to_cpu(toc->entries[i].size); | |
1062 | ||
1063 | if (offset > msg_ram_size || offset + size > msg_ram_size) { | |
1064 | dev_err(dev, "TOC entry with invalid size\n"); | |
1065 | continue; | |
1066 | } | |
1067 | ||
1068 | switch (id) { | |
1069 | case RPM_RX_FIFO_ID: | |
1070 | rx->length = size; | |
1071 | ||
1072 | rx->tail = msg_ram + offset; | |
1073 | rx->head = msg_ram + offset + sizeof(u32); | |
1074 | rx->fifo = msg_ram + offset + 2 * sizeof(u32); | |
1075 | break; | |
1076 | case RPM_TX_FIFO_ID: | |
1077 | tx->length = size; | |
1078 | ||
1079 | tx->tail = msg_ram + offset; | |
1080 | tx->head = msg_ram + offset + sizeof(u32); | |
1081 | tx->fifo = msg_ram + offset + 2 * sizeof(u32); | |
1082 | break; | |
1083 | } | |
1084 | } | |
1085 | ||
1086 | if (!rx->fifo || !tx->fifo) { | |
1087 | dev_err(dev, "Unable to find rx and tx descriptors\n"); | |
1088 | goto err_inval; | |
1089 | } | |
1090 | ||
1091 | kfree(buf); | |
1092 | return 0; | |
1093 | ||
1094 | err_inval: | |
1095 | kfree(buf); | |
1096 | return -EINVAL; | |
1097 | } | |
1098 | ||
1099 | static int glink_rpm_probe(struct platform_device *pdev) | |
1100 | { | |
1101 | struct glink_rpm *glink; | |
1102 | struct device_node *np; | |
1103 | void __iomem *msg_ram; | |
1104 | size_t msg_ram_size; | |
1105 | struct device *dev = &pdev->dev; | |
1106 | struct resource r; | |
1107 | int irq; | |
1108 | int ret; | |
1109 | ||
1110 | glink = devm_kzalloc(dev, sizeof(*glink), GFP_KERNEL); | |
1111 | if (!glink) | |
1112 | return -ENOMEM; | |
1113 | ||
1114 | glink->dev = dev; | |
1115 | ||
1116 | mutex_init(&glink->tx_lock); | |
1117 | spin_lock_init(&glink->rx_lock); | |
1118 | INIT_LIST_HEAD(&glink->rx_queue); | |
1119 | INIT_WORK(&glink->rx_work, glink_rpm_work); | |
1120 | ||
1121 | mutex_init(&glink->idr_lock); | |
1122 | idr_init(&glink->lcids); | |
1123 | idr_init(&glink->rcids); | |
1124 | ||
1125 | glink->mbox_client.dev = &pdev->dev; | |
1126 | glink->mbox_chan = mbox_request_channel(&glink->mbox_client, 0); | |
1127 | if (IS_ERR(glink->mbox_chan)) { | |
1128 | if (PTR_ERR(glink->mbox_chan) != -EPROBE_DEFER) | |
1129 | dev_err(&pdev->dev, "failed to acquire IPC channel\n"); | |
1130 | return PTR_ERR(glink->mbox_chan); | |
1131 | } | |
1132 | ||
1133 | np = of_parse_phandle(dev->of_node, "qcom,rpm-msg-ram", 0); | |
1134 | ret = of_address_to_resource(np, 0, &r); | |
1135 | of_node_put(np); | |
1136 | if (ret) | |
1137 | return ret; | |
1138 | ||
1139 | msg_ram = devm_ioremap(dev, r.start, resource_size(&r)); | |
1140 | msg_ram_size = resource_size(&r); | |
1141 | if (!msg_ram) | |
1142 | return -ENOMEM; | |
1143 | ||
1144 | ret = glink_rpm_parse_toc(dev, msg_ram, msg_ram_size, | |
1145 | &glink->rx_pipe, &glink->tx_pipe); | |
1146 | if (ret) | |
1147 | return ret; | |
1148 | ||
1149 | writel(0, glink->tx_pipe.head); | |
1150 | writel(0, glink->rx_pipe.tail); | |
1151 | ||
1152 | irq = platform_get_irq(pdev, 0); | |
1153 | ret = devm_request_irq(dev, irq, | |
1154 | glink_rpm_intr, | |
1155 | IRQF_NO_SUSPEND | IRQF_SHARED, | |
1156 | "glink-rpm", glink); | |
1157 | if (ret) { | |
1158 | dev_err(dev, "Failed to request IRQ\n"); | |
1159 | return ret; | |
1160 | } | |
1161 | ||
1162 | glink->irq = irq; | |
1163 | ||
1164 | ret = glink_rpm_send_version(glink); | |
1165 | if (ret) | |
1166 | return ret; | |
1167 | ||
1168 | platform_set_drvdata(pdev, glink); | |
1169 | ||
1170 | return 0; | |
1171 | } | |
1172 | ||
1173 | static int glink_rpm_remove_device(struct device *dev, void *data) | |
1174 | { | |
1175 | device_unregister(dev); | |
1176 | ||
1177 | return 0; | |
1178 | } | |
1179 | ||
1180 | static int glink_rpm_remove(struct platform_device *pdev) | |
1181 | { | |
1182 | struct glink_rpm *glink = platform_get_drvdata(pdev); | |
1183 | struct glink_channel *channel; | |
1184 | int cid; | |
1185 | int ret; | |
1186 | ||
1187 | disable_irq(glink->irq); | |
1188 | cancel_work_sync(&glink->rx_work); | |
1189 | ||
1190 | ret = device_for_each_child(glink->dev, NULL, glink_rpm_remove_device); | |
1191 | if (ret) | |
1192 | dev_warn(glink->dev, "Can't remove GLINK devices: %d\n", ret); | |
1193 | ||
1194 | /* Release any defunct local channels, waiting for close-ack */ | |
1195 | idr_for_each_entry(&glink->lcids, channel, cid) | |
1196 | kref_put(&channel->refcount, glink_rpm_channel_release); | |
1197 | ||
1198 | idr_destroy(&glink->lcids); | |
1199 | idr_destroy(&glink->rcids); | |
1200 | ||
1201 | return 0; | |
1202 | } | |
1203 | ||
1204 | static const struct of_device_id glink_rpm_of_match[] = { | |
1205 | { .compatible = "qcom,glink-rpm" }, | |
1206 | {} | |
1207 | }; | |
1208 | MODULE_DEVICE_TABLE(of, glink_rpm_of_match); | |
1209 | ||
1210 | static struct platform_driver glink_rpm_driver = { | |
1211 | .probe = glink_rpm_probe, | |
1212 | .remove = glink_rpm_remove, | |
1213 | .driver = { | |
1214 | .name = "qcom_glink_rpm", | |
1215 | .of_match_table = glink_rpm_of_match, | |
1216 | }, | |
1217 | }; | |
1218 | ||
1219 | static int __init glink_rpm_init(void) | |
1220 | { | |
1221 | return platform_driver_register(&glink_rpm_driver); | |
1222 | } | |
1223 | subsys_initcall(glink_rpm_init); | |
1224 | ||
1225 | static void __exit glink_rpm_exit(void) | |
1226 | { | |
1227 | platform_driver_unregister(&glink_rpm_driver); | |
1228 | } | |
1229 | module_exit(glink_rpm_exit); | |
1230 | ||
1231 | MODULE_AUTHOR("Bjorn Andersson <bjorn.andersson@linaro.org>"); | |
1232 | MODULE_DESCRIPTION("Qualcomm GLINK RPM driver"); | |
1233 | MODULE_LICENSE("GPL v2"); |