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x86/speculation/mds: Fix documentation typo
[linux/fpc-iii.git] / drivers / rpmsg / qcom_glink_native.c
blobe8e12c2b1d0e0c01d7fc16972bd19f731b15263b
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/of_irq.h>
23 #include <linux/platform_device.h>
24 #include <linux/regmap.h>
25 #include <linux/rpmsg.h>
26 #include <linux/sizes.h>
27 #include <linux/slab.h>
28 #include <linux/workqueue.h>
29 #include <linux/mailbox_client.h>
30
31 #include "rpmsg_internal.h"
32 #include "qcom_glink_native.h"
33
34 #define GLINK_NAME_SIZE 32
35 #define GLINK_VERSION_1 1
36
37 #define RPM_GLINK_CID_MIN 1
38 #define RPM_GLINK_CID_MAX 65536
39
40 struct glink_msg {
41 __le16 cmd;
42 __le16 param1;
43 __le32 param2;
44 u8 data[];
45 } __packed;
46
47 /**
48 * struct glink_defer_cmd - deferred incoming control message
49 * @node: list node
50 * @msg: message header
51 * data: payload of the message
52 *
53 * Copy of a received control message, to be added to @rx_queue and processed
54 * by @rx_work of @qcom_glink.
55 */
56 struct glink_defer_cmd {
57 struct list_head node;
58
59 struct glink_msg msg;
60 u8 data[];
61 };
62
63 /**
64 * struct glink_core_rx_intent - RX intent
65 * RX intent
66 *
67 * data: pointer to the data (may be NULL for zero-copy)
68 * id: remote or local intent ID
69 * size: size of the original intent (do not modify)
70 * reuse: To mark if the intent can be reused after first use
71 * in_use: To mark if intent is already in use for the channel
72 * offset: next write offset (initially 0)
73 */
74 struct glink_core_rx_intent {
75 void *data;
76 u32 id;
77 size_t size;
78 bool reuse;
79 bool in_use;
80 u32 offset;
81
82 struct list_head node;
83 };
84
85 /**
86 * struct qcom_glink - driver context, relates to one remote subsystem
87 * @dev: reference to the associated struct device
88 * @mbox_client: mailbox client
89 * @mbox_chan: mailbox channel
90 * @rx_pipe: pipe object for receive FIFO
91 * @tx_pipe: pipe object for transmit FIFO
92 * @irq: IRQ for signaling incoming events
93 * @rx_work: worker for handling received control messages
94 * @rx_lock: protects the @rx_queue
95 * @rx_queue: queue of received control messages to be processed in @rx_work
96 * @tx_lock: synchronizes operations on the tx fifo
97 * @idr_lock: synchronizes @lcids and @rcids modifications
98 * @lcids: idr of all channels with a known local channel id
99 * @rcids: idr of all channels with a known remote channel id
100 */
101 struct qcom_glink {
102 struct device *dev;
103
104 struct mbox_client mbox_client;
105 struct mbox_chan *mbox_chan;
106
107 struct qcom_glink_pipe *rx_pipe;
108 struct qcom_glink_pipe *tx_pipe;
109
110 int irq;
111
112 struct work_struct rx_work;
113 spinlock_t rx_lock;
114 struct list_head rx_queue;
115
116 struct mutex tx_lock;
117
118 spinlock_t idr_lock;
119 struct idr lcids;
120 struct idr rcids;
121 unsigned long features;
122
123 bool intentless;
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: qcom_glink 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 * @intent_lock: lock for protection of @liids, @riids
144 * @liids: idr of all local intents
145 * @riids: idr of all remote intents
146 * @intent_work: worker responsible for transmitting rx_done packets
147 * @done_intents: list of intents that needs to be announced rx_done
148 * @buf: receive buffer, for gathering fragments
149 * @buf_offset: write offset in @buf
150 * @buf_size: size of current @buf
151 * @open_ack: completed once remote has acked the open-request
152 * @open_req: completed once open-request has been received
153 * @intent_req_lock: Synchronises multiple intent requests
154 * @intent_req_result: Result of intent request
155 * @intent_req_comp: Completion for intent_req signalling
156 */
157 struct glink_channel {
158 struct rpmsg_endpoint ept;
159
160 struct rpmsg_device *rpdev;
161 struct qcom_glink *glink;
162
163 struct kref refcount;
164
165 spinlock_t recv_lock;
166
167 char *name;
168 unsigned int lcid;
169 unsigned int rcid;
170
171 spinlock_t intent_lock;
172 struct idr liids;
173 struct idr riids;
174 struct work_struct intent_work;
175 struct list_head done_intents;
176
177 struct glink_core_rx_intent *buf;
178 int buf_offset;
179 int buf_size;
180
181 struct completion open_ack;
182 struct completion open_req;
183
184 struct mutex intent_req_lock;
185 bool intent_req_result;
186 struct completion intent_req_comp;
187 };
188
189 #define to_glink_channel(_ept) container_of(_ept, struct glink_channel, ept)
190
191 static const struct rpmsg_endpoint_ops glink_endpoint_ops;
192
193 #define RPM_CMD_VERSION 0
194 #define RPM_CMD_VERSION_ACK 1
195 #define RPM_CMD_OPEN 2
196 #define RPM_CMD_CLOSE 3
197 #define RPM_CMD_OPEN_ACK 4
198 #define RPM_CMD_INTENT 5
199 #define RPM_CMD_RX_DONE 6
200 #define RPM_CMD_RX_INTENT_REQ 7
201 #define RPM_CMD_RX_INTENT_REQ_ACK 8
202 #define RPM_CMD_TX_DATA 9
203 #define RPM_CMD_CLOSE_ACK 11
204 #define RPM_CMD_TX_DATA_CONT 12
205 #define RPM_CMD_READ_NOTIF 13
206 #define RPM_CMD_RX_DONE_W_REUSE 14
207
208 #define GLINK_FEATURE_INTENTLESS BIT(1)
209
210 static void qcom_glink_rx_done_work(struct work_struct *work);
211
212 static struct glink_channel *qcom_glink_alloc_channel(struct qcom_glink *glink,
213 const char *name)
214 {
215 struct glink_channel *channel;
216
217 channel = kzalloc(sizeof(*channel), GFP_KERNEL);
218 if (!channel)
219 return ERR_PTR(-ENOMEM);
220
221 /* Setup glink internal glink_channel data */
222 spin_lock_init(&channel->recv_lock);
223 spin_lock_init(&channel->intent_lock);
224
225 channel->glink = glink;
226 channel->name = kstrdup(name, GFP_KERNEL);
227
228 init_completion(&channel->open_req);
229 init_completion(&channel->open_ack);
230 init_completion(&channel->intent_req_comp);
231
232 INIT_LIST_HEAD(&channel->done_intents);
233 INIT_WORK(&channel->intent_work, qcom_glink_rx_done_work);
234
235 idr_init(&channel->liids);
236 idr_init(&channel->riids);
237 kref_init(&channel->refcount);
238
239 return channel;
240 }
241
242 static void qcom_glink_channel_release(struct kref *ref)
243 {
244 struct glink_channel *channel = container_of(ref, struct glink_channel,
245 refcount);
246 unsigned long flags;
247
248 spin_lock_irqsave(&channel->intent_lock, flags);
249 idr_destroy(&channel->liids);
250 idr_destroy(&channel->riids);
251 spin_unlock_irqrestore(&channel->intent_lock, flags);
252
253 kfree(channel->name);
254 kfree(channel);
255 }
256
257 static size_t qcom_glink_rx_avail(struct qcom_glink *glink)
258 {
259 return glink->rx_pipe->avail(glink->rx_pipe);
260 }
261
262 static void qcom_glink_rx_peak(struct qcom_glink *glink,
263 void *data, unsigned int offset, size_t count)
264 {
265 glink->rx_pipe->peak(glink->rx_pipe, data, offset, count);
266 }
267
268 static void qcom_glink_rx_advance(struct qcom_glink *glink, size_t count)
269 {
270 glink->rx_pipe->advance(glink->rx_pipe, count);
271 }
272
273 static size_t qcom_glink_tx_avail(struct qcom_glink *glink)
274 {
275 return glink->tx_pipe->avail(glink->tx_pipe);
276 }
277
278 static void qcom_glink_tx_write(struct qcom_glink *glink,
279 const void *hdr, size_t hlen,
280 const void *data, size_t dlen)
281 {
282 glink->tx_pipe->write(glink->tx_pipe, hdr, hlen, data, dlen);
283 }
284
285 static int qcom_glink_tx(struct qcom_glink *glink,
286 const void *hdr, size_t hlen,
287 const void *data, size_t dlen, bool wait)
288 {
289 unsigned int tlen = hlen + dlen;
290 int ret;
291
292 /* Reject packets that are too big */
293 if (tlen >= glink->tx_pipe->length)
294 return -EINVAL;
295
296 ret = mutex_lock_interruptible(&glink->tx_lock);
297 if (ret)
298 return ret;
299
300 while (qcom_glink_tx_avail(glink) < tlen) {
301 if (!wait) {
302 ret = -EAGAIN;
303 goto out;
304 }
305
306 usleep_range(10000, 15000);
307 }
308
309 qcom_glink_tx_write(glink, hdr, hlen, data, dlen);
310
311 mbox_send_message(glink->mbox_chan, NULL);
312 mbox_client_txdone(glink->mbox_chan, 0);
313
314 out:
315 mutex_unlock(&glink->tx_lock);
316
317 return ret;
318 }
319
320 static int qcom_glink_send_version(struct qcom_glink *glink)
321 {
322 struct glink_msg msg;
323
324 msg.cmd = cpu_to_le16(RPM_CMD_VERSION);
325 msg.param1 = cpu_to_le16(GLINK_VERSION_1);
326 msg.param2 = cpu_to_le32(glink->features);
327
328 return qcom_glink_tx(glink, &msg, sizeof(msg), NULL, 0, true);
329 }
330
331 static void qcom_glink_send_version_ack(struct qcom_glink *glink)
332 {
333 struct glink_msg msg;
334
335 msg.cmd = cpu_to_le16(RPM_CMD_VERSION_ACK);
336 msg.param1 = cpu_to_le16(GLINK_VERSION_1);
337 msg.param2 = cpu_to_le32(glink->features);
338
339 qcom_glink_tx(glink, &msg, sizeof(msg), NULL, 0, true);
340 }
341
342 static void qcom_glink_send_open_ack(struct qcom_glink *glink,
343 struct glink_channel *channel)
344 {
345 struct glink_msg msg;
346
347 msg.cmd = cpu_to_le16(RPM_CMD_OPEN_ACK);
348 msg.param1 = cpu_to_le16(channel->rcid);
349 msg.param2 = cpu_to_le32(0);
350
351 qcom_glink_tx(glink, &msg, sizeof(msg), NULL, 0, true);
352 }
353
354 static void qcom_glink_handle_intent_req_ack(struct qcom_glink *glink,
355 unsigned int cid, bool granted)
356 {
357 struct glink_channel *channel;
358 unsigned long flags;
359
360 spin_lock_irqsave(&glink->idr_lock, flags);
361 channel = idr_find(&glink->rcids, cid);
362 spin_unlock_irqrestore(&glink->idr_lock, flags);
363 if (!channel) {
364 dev_err(glink->dev, "unable to find channel\n");
365 return;
366 }
367
368 channel->intent_req_result = granted;
369 complete(&channel->intent_req_comp);
370 }
371
372 /**
373 * qcom_glink_send_open_req() - send a RPM_CMD_OPEN request to the remote
374 * @glink: Ptr to the glink edge
375 * @channel: Ptr to the channel that the open req is sent
376 *
377 * Allocates a local channel id and sends a RPM_CMD_OPEN message to the remote.
378 * Will return with refcount held, regardless of outcome.
379 *
380 * Returns 0 on success, negative errno otherwise.
381 */
382 static int qcom_glink_send_open_req(struct qcom_glink *glink,
383 struct glink_channel *channel)
384 {
385 struct {
386 struct glink_msg msg;
387 u8 name[GLINK_NAME_SIZE];
388 } __packed req;
389 int name_len = strlen(channel->name) + 1;
390 int req_len = ALIGN(sizeof(req.msg) + name_len, 8);
391 int ret;
392 unsigned long flags;
393
394 kref_get(&channel->refcount);
395
396 spin_lock_irqsave(&glink->idr_lock, flags);
397 ret = idr_alloc_cyclic(&glink->lcids, channel,
398 RPM_GLINK_CID_MIN, RPM_GLINK_CID_MAX,
399 GFP_ATOMIC);
400 spin_unlock_irqrestore(&glink->idr_lock, flags);
401 if (ret < 0)
402 return ret;
403
404 channel->lcid = ret;
405
406 req.msg.cmd = cpu_to_le16(RPM_CMD_OPEN);
407 req.msg.param1 = cpu_to_le16(channel->lcid);
408 req.msg.param2 = cpu_to_le32(name_len);
409 strcpy(req.name, channel->name);
410
411 ret = qcom_glink_tx(glink, &req, req_len, NULL, 0, true);
412 if (ret)
413 goto remove_idr;
414
415 return 0;
416
417 remove_idr:
418 spin_lock_irqsave(&glink->idr_lock, flags);
419 idr_remove(&glink->lcids, channel->lcid);
420 channel->lcid = 0;
421 spin_unlock_irqrestore(&glink->idr_lock, flags);
422
423 return ret;
424 }
425
426 static void qcom_glink_send_close_req(struct qcom_glink *glink,
427 struct glink_channel *channel)
428 {
429 struct glink_msg req;
430
431 req.cmd = cpu_to_le16(RPM_CMD_CLOSE);
432 req.param1 = cpu_to_le16(channel->lcid);
433 req.param2 = 0;
434
435 qcom_glink_tx(glink, &req, sizeof(req), NULL, 0, true);
436 }
437
438 static void qcom_glink_send_close_ack(struct qcom_glink *glink,
439 unsigned int rcid)
440 {
441 struct glink_msg req;
442
443 req.cmd = cpu_to_le16(RPM_CMD_CLOSE_ACK);
444 req.param1 = cpu_to_le16(rcid);
445 req.param2 = 0;
446
447 qcom_glink_tx(glink, &req, sizeof(req), NULL, 0, true);
448 }
449
450 static void qcom_glink_rx_done_work(struct work_struct *work)
451 {
452 struct glink_channel *channel = container_of(work, struct glink_channel,
453 intent_work);
454 struct qcom_glink *glink = channel->glink;
455 struct glink_core_rx_intent *intent, *tmp;
456 struct {
457 u16 id;
458 u16 lcid;
459 u32 liid;
460 } __packed cmd;
461
462 unsigned int cid = channel->lcid;
463 unsigned int iid;
464 bool reuse;
465 unsigned long flags;
466
467 spin_lock_irqsave(&channel->intent_lock, flags);
468 list_for_each_entry_safe(intent, tmp, &channel->done_intents, node) {
469 list_del(&intent->node);
470 spin_unlock_irqrestore(&channel->intent_lock, flags);
471 iid = intent->id;
472 reuse = intent->reuse;
473
474 cmd.id = reuse ? RPM_CMD_RX_DONE_W_REUSE : RPM_CMD_RX_DONE;
475 cmd.lcid = cid;
476 cmd.liid = iid;
477
478 qcom_glink_tx(glink, &cmd, sizeof(cmd), NULL, 0, true);
479 if (!reuse) {
480 kfree(intent->data);
481 kfree(intent);
482 }
483 spin_lock_irqsave(&channel->intent_lock, flags);
484 }
485 spin_unlock_irqrestore(&channel->intent_lock, flags);
486 }
487
488 static void qcom_glink_rx_done(struct qcom_glink *glink,
489 struct glink_channel *channel,
490 struct glink_core_rx_intent *intent)
491 {
492 /* We don't send RX_DONE to intentless systems */
493 if (glink->intentless) {
494 kfree(intent->data);
495 kfree(intent);
496 return;
497 }
498
499 /* Take it off the tree of receive intents */
500 if (!intent->reuse) {
501 spin_lock(&channel->intent_lock);
502 idr_remove(&channel->liids, intent->id);
503 spin_unlock(&channel->intent_lock);
504 }
505
506 /* Schedule the sending of a rx_done indication */
507 spin_lock(&channel->intent_lock);
508 list_add_tail(&intent->node, &channel->done_intents);
509 spin_unlock(&channel->intent_lock);
510
511 schedule_work(&channel->intent_work);
512 }
513
514 /**
515 * qcom_glink_receive_version() - receive version/features from remote system
516 *
517 * @glink: pointer to transport interface
518 * @r_version: remote version
519 * @r_features: remote features
520 *
521 * This function is called in response to a remote-initiated version/feature
522 * negotiation sequence.
523 */
524 static void qcom_glink_receive_version(struct qcom_glink *glink,
525 u32 version,
526 u32 features)
527 {
528 switch (version) {
529 case 0:
530 break;
531 case GLINK_VERSION_1:
532 glink->features &= features;
533 /* FALLTHROUGH */
534 default:
535 qcom_glink_send_version_ack(glink);
536 break;
537 }
538 }
539
540 /**
541 * qcom_glink_receive_version_ack() - receive negotiation ack from remote system
542 *
543 * @glink: pointer to transport interface
544 * @r_version: remote version response
545 * @r_features: remote features response
546 *
547 * This function is called in response to a local-initiated version/feature
548 * negotiation sequence and is the counter-offer from the remote side based
549 * upon the initial version and feature set requested.
550 */
551 static void qcom_glink_receive_version_ack(struct qcom_glink *glink,
552 u32 version,
553 u32 features)
554 {
555 switch (version) {
556 case 0:
557 /* Version negotiation failed */
558 break;
559 case GLINK_VERSION_1:
560 if (features == glink->features)
561 break;
562
563 glink->features &= features;
564 /* FALLTHROUGH */
565 default:
566 qcom_glink_send_version(glink);
567 break;
568 }
569 }
570
571 /**
572 * qcom_glink_send_intent_req_ack() - convert an rx intent request ack cmd to
573 wire format and transmit
574 * @glink: The transport to transmit on.
575 * @channel: The glink channel
576 * @granted: The request response to encode.
577 *
578 * Return: 0 on success or standard Linux error code.
579 */
580 static int qcom_glink_send_intent_req_ack(struct qcom_glink *glink,
581 struct glink_channel *channel,
582 bool granted)
583 {
584 struct glink_msg msg;
585
586 msg.cmd = cpu_to_le16(RPM_CMD_RX_INTENT_REQ_ACK);
587 msg.param1 = cpu_to_le16(channel->lcid);
588 msg.param2 = cpu_to_le32(granted);
589
590 qcom_glink_tx(glink, &msg, sizeof(msg), NULL, 0, true);
591
592 return 0;
593 }
594
595 /**
596 * qcom_glink_advertise_intent - convert an rx intent cmd to wire format and
597 * transmit
598 * @glink: The transport to transmit on.
599 * @channel: The local channel
600 * @size: The intent to pass on to remote.
601 *
602 * Return: 0 on success or standard Linux error code.
603 */
604 static int qcom_glink_advertise_intent(struct qcom_glink *glink,
605 struct glink_channel *channel,
606 struct glink_core_rx_intent *intent)
607 {
608 struct command {
609 u16 id;
610 u16 lcid;
611 u32 count;
612 u32 size;
613 u32 liid;
614 } __packed;
615 struct command cmd;
616
617 cmd.id = cpu_to_le16(RPM_CMD_INTENT);
618 cmd.lcid = cpu_to_le16(channel->lcid);
619 cmd.count = cpu_to_le32(1);
620 cmd.size = cpu_to_le32(intent->size);
621 cmd.liid = cpu_to_le32(intent->id);
622
623 qcom_glink_tx(glink, &cmd, sizeof(cmd), NULL, 0, true);
624
625 return 0;
626 }
627
628 static struct glink_core_rx_intent *
629 qcom_glink_alloc_intent(struct qcom_glink *glink,
630 struct glink_channel *channel,
631 size_t size,
632 bool reuseable)
633 {
634 struct glink_core_rx_intent *intent;
635 int ret;
636 unsigned long flags;
637
638 intent = kzalloc(sizeof(*intent), GFP_KERNEL);
639 if (!intent)
640 return NULL;
641
642 intent->data = kzalloc(size, GFP_KERNEL);
643 if (!intent->data)
644 goto free_intent;
645
646 spin_lock_irqsave(&channel->intent_lock, flags);
647 ret = idr_alloc_cyclic(&channel->liids, intent, 1, -1, GFP_ATOMIC);
648 if (ret < 0) {
649 spin_unlock_irqrestore(&channel->intent_lock, flags);
650 goto free_data;
651 }
652 spin_unlock_irqrestore(&channel->intent_lock, flags);
653
654 intent->id = ret;
655 intent->size = size;
656 intent->reuse = reuseable;
657
658 return intent;
659
660 free_data:
661 kfree(intent->data);
662 free_intent:
663 kfree(intent);
664 return NULL;
665 }
666
667 static void qcom_glink_handle_rx_done(struct qcom_glink *glink,
668 u32 cid, uint32_t iid,
669 bool reuse)
670 {
671 struct glink_core_rx_intent *intent;
672 struct glink_channel *channel;
673 unsigned long flags;
674
675 spin_lock_irqsave(&glink->idr_lock, flags);
676 channel = idr_find(&glink->rcids, cid);
677 spin_unlock_irqrestore(&glink->idr_lock, flags);
678 if (!channel) {
679 dev_err(glink->dev, "invalid channel id received\n");
680 return;
681 }
682
683 spin_lock_irqsave(&channel->intent_lock, flags);
684 intent = idr_find(&channel->riids, iid);
685
686 if (!intent) {
687 spin_unlock_irqrestore(&channel->intent_lock, flags);
688 dev_err(glink->dev, "invalid intent id received\n");
689 return;
690 }
691
692 intent->in_use = false;
693
694 if (!reuse) {
695 idr_remove(&channel->riids, intent->id);
696 kfree(intent);
697 }
698 spin_unlock_irqrestore(&channel->intent_lock, flags);
699 }
700
701 /**
702 * qcom_glink_handle_intent_req() - Receive a request for rx_intent
703 * from remote side
704 * if_ptr: Pointer to the transport interface
705 * rcid: Remote channel ID
706 * size: size of the intent
707 *
708 * The function searches for the local channel to which the request for
709 * rx_intent has arrived and allocates and notifies the remote back
710 */
711 static void qcom_glink_handle_intent_req(struct qcom_glink *glink,
712 u32 cid, size_t size)
713 {
714 struct glink_core_rx_intent *intent;
715 struct glink_channel *channel;
716 unsigned long flags;
717
718 spin_lock_irqsave(&glink->idr_lock, flags);
719 channel = idr_find(&glink->rcids, cid);
720 spin_unlock_irqrestore(&glink->idr_lock, flags);
721
722 if (!channel) {
723 pr_err("%s channel not found for cid %d\n", __func__, cid);
724 return;
725 }
726
727 intent = qcom_glink_alloc_intent(glink, channel, size, false);
728 if (intent)
729 qcom_glink_advertise_intent(glink, channel, intent);
730
731 qcom_glink_send_intent_req_ack(glink, channel, !!intent);
732 }
733
734 static int qcom_glink_rx_defer(struct qcom_glink *glink, size_t extra)
735 {
736 struct glink_defer_cmd *dcmd;
737
738 extra = ALIGN(extra, 8);
739
740 if (qcom_glink_rx_avail(glink) < sizeof(struct glink_msg) + extra) {
741 dev_dbg(glink->dev, "Insufficient data in rx fifo");
742 return -ENXIO;
743 }
744
745 dcmd = kzalloc(sizeof(*dcmd) + extra, GFP_ATOMIC);
746 if (!dcmd)
747 return -ENOMEM;
748
749 INIT_LIST_HEAD(&dcmd->node);
750
751 qcom_glink_rx_peak(glink, &dcmd->msg, 0, sizeof(dcmd->msg) + extra);
752
753 spin_lock(&glink->rx_lock);
754 list_add_tail(&dcmd->node, &glink->rx_queue);
755 spin_unlock(&glink->rx_lock);
756
757 schedule_work(&glink->rx_work);
758 qcom_glink_rx_advance(glink, sizeof(dcmd->msg) + extra);
759
760 return 0;
761 }
762
763 static int qcom_glink_rx_data(struct qcom_glink *glink, size_t avail)
764 {
765 struct glink_core_rx_intent *intent;
766 struct glink_channel *channel;
767 struct {
768 struct glink_msg msg;
769 __le32 chunk_size;
770 __le32 left_size;
771 } __packed hdr;
772 unsigned int chunk_size;
773 unsigned int left_size;
774 unsigned int rcid;
775 unsigned int liid;
776 int ret = 0;
777 unsigned long flags;
778
779 if (avail < sizeof(hdr)) {
780 dev_dbg(glink->dev, "Not enough data in fifo\n");
781 return -EAGAIN;
782 }
783
784 qcom_glink_rx_peak(glink, &hdr, 0, sizeof(hdr));
785 chunk_size = le32_to_cpu(hdr.chunk_size);
786 left_size = le32_to_cpu(hdr.left_size);
787
788 if (avail < sizeof(hdr) + chunk_size) {
789 dev_dbg(glink->dev, "Payload not yet in fifo\n");
790 return -EAGAIN;
791 }
792
793 if (WARN(chunk_size % 4, "Incoming data must be word aligned\n"))
794 return -EINVAL;
795
796 rcid = le16_to_cpu(hdr.msg.param1);
797 spin_lock_irqsave(&glink->idr_lock, flags);
798 channel = idr_find(&glink->rcids, rcid);
799 spin_unlock_irqrestore(&glink->idr_lock, flags);
800 if (!channel) {
801 dev_dbg(glink->dev, "Data on non-existing channel\n");
802
803 /* Drop the message */
804 goto advance_rx;
805 }
806
807 if (glink->intentless) {
808 /* Might have an ongoing, fragmented, message to append */
809 if (!channel->buf) {
810 intent = kzalloc(sizeof(*intent), GFP_ATOMIC);
811 if (!intent)
812 return -ENOMEM;
813
814 intent->data = kmalloc(chunk_size + left_size,
815 GFP_ATOMIC);
816 if (!intent->data) {
817 kfree(intent);
818 return -ENOMEM;
819 }
820
821 intent->id = 0xbabababa;
822 intent->size = chunk_size + left_size;
823 intent->offset = 0;
824
825 channel->buf = intent;
826 } else {
827 intent = channel->buf;
828 }
829 } else {
830 liid = le32_to_cpu(hdr.msg.param2);
831
832 spin_lock_irqsave(&channel->intent_lock, flags);
833 intent = idr_find(&channel->liids, liid);
834 spin_unlock_irqrestore(&channel->intent_lock, flags);
835
836 if (!intent) {
837 dev_err(glink->dev,
838 "no intent found for channel %s intent %d",
839 channel->name, liid);
840 goto advance_rx;
841 }
842 }
843
844 if (intent->size - intent->offset < chunk_size) {
845 dev_err(glink->dev, "Insufficient space in intent\n");
846
847 /* The packet header lied, drop payload */
848 goto advance_rx;
849 }
850
851 qcom_glink_rx_peak(glink, intent->data + intent->offset,
852 sizeof(hdr), chunk_size);
853 intent->offset += chunk_size;
854
855 /* Handle message when no fragments remain to be received */
856 if (!left_size) {
857 spin_lock(&channel->recv_lock);
858 if (channel->ept.cb) {
859 channel->ept.cb(channel->ept.rpdev,
860 intent->data,
861 intent->offset,
862 channel->ept.priv,
863 RPMSG_ADDR_ANY);
864 }
865 spin_unlock(&channel->recv_lock);
866
867 intent->offset = 0;
868 channel->buf = NULL;
869
870 qcom_glink_rx_done(glink, channel, intent);
871 }
872
873 advance_rx:
874 qcom_glink_rx_advance(glink, ALIGN(sizeof(hdr) + chunk_size, 8));
875
876 return ret;
877 }
878
879 static void qcom_glink_handle_intent(struct qcom_glink *glink,
880 unsigned int cid,
881 unsigned int count,
882 size_t avail)
883 {
884 struct glink_core_rx_intent *intent;
885 struct glink_channel *channel;
886 struct intent_pair {
887 __le32 size;
888 __le32 iid;
889 };
890
891 struct {
892 struct glink_msg msg;
893 struct intent_pair intents[];
894 } __packed * msg;
895
896 const size_t msglen = sizeof(*msg) + sizeof(struct intent_pair) * count;
897 int ret;
898 int i;
899 unsigned long flags;
900
901 if (avail < msglen) {
902 dev_dbg(glink->dev, "Not enough data in fifo\n");
903 return;
904 }
905
906 spin_lock_irqsave(&glink->idr_lock, flags);
907 channel = idr_find(&glink->rcids, cid);
908 spin_unlock_irqrestore(&glink->idr_lock, flags);
909 if (!channel) {
910 dev_err(glink->dev, "intents for non-existing channel\n");
911 return;
912 }
913
914 msg = kmalloc(msglen, GFP_ATOMIC);
915 if (!msg)
916 return;
917
918 qcom_glink_rx_peak(glink, msg, 0, msglen);
919
920 for (i = 0; i < count; ++i) {
921 intent = kzalloc(sizeof(*intent), GFP_ATOMIC);
922 if (!intent)
923 break;
924
925 intent->id = le32_to_cpu(msg->intents[i].iid);
926 intent->size = le32_to_cpu(msg->intents[i].size);
927
928 spin_lock_irqsave(&channel->intent_lock, flags);
929 ret = idr_alloc(&channel->riids, intent,
930 intent->id, intent->id + 1, GFP_ATOMIC);
931 spin_unlock_irqrestore(&channel->intent_lock, flags);
932
933 if (ret < 0)
934 dev_err(glink->dev, "failed to store remote intent\n");
935 }
936
937 kfree(msg);
938 qcom_glink_rx_advance(glink, ALIGN(msglen, 8));
939 }
940
941 static int qcom_glink_rx_open_ack(struct qcom_glink *glink, unsigned int lcid)
942 {
943 struct glink_channel *channel;
944
945 spin_lock(&glink->idr_lock);
946 channel = idr_find(&glink->lcids, lcid);
947 spin_unlock(&glink->idr_lock);
948 if (!channel) {
949 dev_err(glink->dev, "Invalid open ack packet\n");
950 return -EINVAL;
951 }
952
953 complete(&channel->open_ack);
954
955 return 0;
956 }
957
958 static irqreturn_t qcom_glink_native_intr(int irq, void *data)
959 {
960 struct qcom_glink *glink = data;
961 struct glink_msg msg;
962 unsigned int param1;
963 unsigned int param2;
964 unsigned int avail;
965 unsigned int cmd;
966 int ret = 0;
967
968 for (;;) {
969 avail = qcom_glink_rx_avail(glink);
970 if (avail < sizeof(msg))
971 break;
972
973 qcom_glink_rx_peak(glink, &msg, 0, sizeof(msg));
974
975 cmd = le16_to_cpu(msg.cmd);
976 param1 = le16_to_cpu(msg.param1);
977 param2 = le32_to_cpu(msg.param2);
978
979 switch (cmd) {
980 case RPM_CMD_VERSION:
981 case RPM_CMD_VERSION_ACK:
982 case RPM_CMD_CLOSE:
983 case RPM_CMD_CLOSE_ACK:
984 case RPM_CMD_RX_INTENT_REQ:
985 ret = qcom_glink_rx_defer(glink, 0);
986 break;
987 case RPM_CMD_OPEN_ACK:
988 ret = qcom_glink_rx_open_ack(glink, param1);
989 qcom_glink_rx_advance(glink, ALIGN(sizeof(msg), 8));
990 break;
991 case RPM_CMD_OPEN:
992 ret = qcom_glink_rx_defer(glink, param2);
993 break;
994 case RPM_CMD_TX_DATA:
995 case RPM_CMD_TX_DATA_CONT:
996 ret = qcom_glink_rx_data(glink, avail);
997 break;
998 case RPM_CMD_READ_NOTIF:
999 qcom_glink_rx_advance(glink, ALIGN(sizeof(msg), 8));
1000
1001 mbox_send_message(glink->mbox_chan, NULL);
1002 mbox_client_txdone(glink->mbox_chan, 0);
1003 break;
1004 case RPM_CMD_INTENT:
1005 qcom_glink_handle_intent(glink, param1, param2, avail);
1006 break;
1007 case RPM_CMD_RX_DONE:
1008 qcom_glink_handle_rx_done(glink, param1, param2, false);
1009 qcom_glink_rx_advance(glink, ALIGN(sizeof(msg), 8));
1010 break;
1011 case RPM_CMD_RX_DONE_W_REUSE:
1012 qcom_glink_handle_rx_done(glink, param1, param2, true);
1013 qcom_glink_rx_advance(glink, ALIGN(sizeof(msg), 8));
1014 break;
1015 case RPM_CMD_RX_INTENT_REQ_ACK:
1016 qcom_glink_handle_intent_req_ack(glink, param1, param2);
1017 qcom_glink_rx_advance(glink, ALIGN(sizeof(msg), 8));
1018 break;
1019 default:
1020 dev_err(glink->dev, "unhandled rx cmd: %d\n", cmd);
1021 ret = -EINVAL;
1022 break;
1023 }
1024
1025 if (ret)
1026 break;
1027 }
1028
1029 return IRQ_HANDLED;
1030 }
1031
1032 /* Locally initiated rpmsg_create_ept */
1033 static struct glink_channel *qcom_glink_create_local(struct qcom_glink *glink,
1034 const char *name)
1035 {
1036 struct glink_channel *channel;
1037 int ret;
1038 unsigned long flags;
1039
1040 channel = qcom_glink_alloc_channel(glink, name);
1041 if (IS_ERR(channel))
1042 return ERR_CAST(channel);
1043
1044 ret = qcom_glink_send_open_req(glink, channel);
1045 if (ret)
1046 goto release_channel;
1047
1048 ret = wait_for_completion_timeout(&channel->open_ack, 5 * HZ);
1049 if (!ret)
1050 goto err_timeout;
1051
1052 ret = wait_for_completion_timeout(&channel->open_req, 5 * HZ);
1053 if (!ret)
1054 goto err_timeout;
1055
1056 qcom_glink_send_open_ack(glink, channel);
1057
1058 return channel;
1059
1060 err_timeout:
1061 /* qcom_glink_send_open_req() did register the channel in lcids*/
1062 spin_lock_irqsave(&glink->idr_lock, flags);
1063 idr_remove(&glink->lcids, channel->lcid);
1064 spin_unlock_irqrestore(&glink->idr_lock, flags);
1065
1066 release_channel:
1067 /* Release qcom_glink_send_open_req() reference */
1068 kref_put(&channel->refcount, qcom_glink_channel_release);
1069 /* Release qcom_glink_alloc_channel() reference */
1070 kref_put(&channel->refcount, qcom_glink_channel_release);
1071
1072 return ERR_PTR(-ETIMEDOUT);
1073 }
1074
1075 /* Remote initiated rpmsg_create_ept */
1076 static int qcom_glink_create_remote(struct qcom_glink *glink,
1077 struct glink_channel *channel)
1078 {
1079 int ret;
1080
1081 qcom_glink_send_open_ack(glink, channel);
1082
1083 ret = qcom_glink_send_open_req(glink, channel);
1084 if (ret)
1085 goto close_link;
1086
1087 ret = wait_for_completion_timeout(&channel->open_ack, 5 * HZ);
1088 if (!ret) {
1089 ret = -ETIMEDOUT;
1090 goto close_link;
1091 }
1092
1093 return 0;
1094
1095 close_link:
1096 /*
1097 * Send a close request to "undo" our open-ack. The close-ack will
1098 * release the last reference.
1099 */
1100 qcom_glink_send_close_req(glink, channel);
1101
1102 /* Release qcom_glink_send_open_req() reference */
1103 kref_put(&channel->refcount, qcom_glink_channel_release);
1104
1105 return ret;
1106 }
1107
1108 static struct rpmsg_endpoint *qcom_glink_create_ept(struct rpmsg_device *rpdev,
1109 rpmsg_rx_cb_t cb,
1110 void *priv,
1111 struct rpmsg_channel_info
1112 chinfo)
1113 {
1114 struct glink_channel *parent = to_glink_channel(rpdev->ept);
1115 struct glink_channel *channel;
1116 struct qcom_glink *glink = parent->glink;
1117 struct rpmsg_endpoint *ept;
1118 const char *name = chinfo.name;
1119 int cid;
1120 int ret;
1121 unsigned long flags;
1122
1123 spin_lock_irqsave(&glink->idr_lock, flags);
1124 idr_for_each_entry(&glink->rcids, channel, cid) {
1125 if (!strcmp(channel->name, name))
1126 break;
1127 }
1128 spin_unlock_irqrestore(&glink->idr_lock, flags);
1129
1130 if (!channel) {
1131 channel = qcom_glink_create_local(glink, name);
1132 if (IS_ERR(channel))
1133 return NULL;
1134 } else {
1135 ret = qcom_glink_create_remote(glink, channel);
1136 if (ret)
1137 return NULL;
1138 }
1139
1140 ept = &channel->ept;
1141 ept->rpdev = rpdev;
1142 ept->cb = cb;
1143 ept->priv = priv;
1144 ept->ops = &glink_endpoint_ops;
1145
1146 return ept;
1147 }
1148
1149 static int qcom_glink_announce_create(struct rpmsg_device *rpdev)
1150 {
1151 struct glink_channel *channel = to_glink_channel(rpdev->ept);
1152 struct glink_core_rx_intent *intent;
1153 struct qcom_glink *glink = channel->glink;
1154 int num_intents = glink->intentless ? 0 : 5;
1155
1156 /* Channel is now open, advertise base set of intents */
1157 while (num_intents--) {
1158 intent = qcom_glink_alloc_intent(glink, channel, SZ_1K, true);
1159 if (!intent)
1160 break;
1161
1162 qcom_glink_advertise_intent(glink, channel, intent);
1163 }
1164
1165 return 0;
1166 }
1167
1168 static void qcom_glink_destroy_ept(struct rpmsg_endpoint *ept)
1169 {
1170 struct glink_channel *channel = to_glink_channel(ept);
1171 struct qcom_glink *glink = channel->glink;
1172 unsigned long flags;
1173
1174 spin_lock_irqsave(&channel->recv_lock, flags);
1175 channel->ept.cb = NULL;
1176 spin_unlock_irqrestore(&channel->recv_lock, flags);
1177
1178 /* Decouple the potential rpdev from the channel */
1179 channel->rpdev = NULL;
1180
1181 qcom_glink_send_close_req(glink, channel);
1182 }
1183
1184 static int qcom_glink_request_intent(struct qcom_glink *glink,
1185 struct glink_channel *channel,
1186 size_t size)
1187 {
1188 struct {
1189 u16 id;
1190 u16 cid;
1191 u32 size;
1192 } __packed cmd;
1193
1194 int ret;
1195
1196 mutex_lock(&channel->intent_req_lock);
1197
1198 reinit_completion(&channel->intent_req_comp);
1199
1200 cmd.id = RPM_CMD_RX_INTENT_REQ;
1201 cmd.cid = channel->lcid;
1202 cmd.size = size;
1203
1204 ret = qcom_glink_tx(glink, &cmd, sizeof(cmd), NULL, 0, true);
1205 if (ret)
1206 goto unlock;
1207
1208 ret = wait_for_completion_timeout(&channel->intent_req_comp, 10 * HZ);
1209 if (!ret) {
1210 dev_err(glink->dev, "intent request timed out\n");
1211 ret = -ETIMEDOUT;
1212 } else {
1213 ret = channel->intent_req_result ? 0 : -ECANCELED;
1214 }
1215
1216 unlock:
1217 mutex_unlock(&channel->intent_req_lock);
1218 return ret;
1219 }
1220
1221 static int __qcom_glink_send(struct glink_channel *channel,
1222 void *data, int len, bool wait)
1223 {
1224 struct qcom_glink *glink = channel->glink;
1225 struct glink_core_rx_intent *intent = NULL;
1226 struct glink_core_rx_intent *tmp;
1227 int iid = 0;
1228 struct {
1229 struct glink_msg msg;
1230 __le32 chunk_size;
1231 __le32 left_size;
1232 } __packed req;
1233 int ret;
1234 unsigned long flags;
1235
1236 if (!glink->intentless) {
1237 while (!intent) {
1238 spin_lock_irqsave(&channel->intent_lock, flags);
1239 idr_for_each_entry(&channel->riids, tmp, iid) {
1240 if (tmp->size >= len && !tmp->in_use) {
1241 tmp->in_use = true;
1242 intent = tmp;
1243 break;
1244 }
1245 }
1246 spin_unlock_irqrestore(&channel->intent_lock, flags);
1247
1248 /* We found an available intent */
1249 if (intent)
1250 break;
1251
1252 if (!wait)
1253 return -EBUSY;
1254
1255 ret = qcom_glink_request_intent(glink, channel, len);
1256 if (ret < 0)
1257 return ret;
1258 }
1259
1260 iid = intent->id;
1261 }
1262
1263 req.msg.cmd = cpu_to_le16(RPM_CMD_TX_DATA);
1264 req.msg.param1 = cpu_to_le16(channel->lcid);
1265 req.msg.param2 = cpu_to_le32(iid);
1266 req.chunk_size = cpu_to_le32(len);
1267 req.left_size = cpu_to_le32(0);
1268
1269 ret = qcom_glink_tx(glink, &req, sizeof(req), data, len, wait);
1270
1271 /* Mark intent available if we failed */
1272 if (ret && intent)
1273 intent->in_use = false;
1274
1275 return ret;
1276 }
1277
1278 static int qcom_glink_send(struct rpmsg_endpoint *ept, void *data, int len)
1279 {
1280 struct glink_channel *channel = to_glink_channel(ept);
1281
1282 return __qcom_glink_send(channel, data, len, true);
1283 }
1284
1285 static int qcom_glink_trysend(struct rpmsg_endpoint *ept, void *data, int len)
1286 {
1287 struct glink_channel *channel = to_glink_channel(ept);
1288
1289 return __qcom_glink_send(channel, data, len, false);
1290 }
1291
1292 /*
1293 * Finds the device_node for the glink child interested in this channel.
1294 */
1295 static struct device_node *qcom_glink_match_channel(struct device_node *node,
1296 const char *channel)
1297 {
1298 struct device_node *child;
1299 const char *name;
1300 const char *key;
1301 int ret;
1302
1303 for_each_available_child_of_node(node, child) {
1304 key = "qcom,glink-channels";
1305 ret = of_property_read_string(child, key, &name);
1306 if (ret)
1307 continue;
1308
1309 if (strcmp(name, channel) == 0)
1310 return child;
1311 }
1312
1313 return NULL;
1314 }
1315
1316 static const struct rpmsg_device_ops glink_device_ops = {
1317 .create_ept = qcom_glink_create_ept,
1318 .announce_create = qcom_glink_announce_create,
1319 };
1320
1321 static const struct rpmsg_endpoint_ops glink_endpoint_ops = {
1322 .destroy_ept = qcom_glink_destroy_ept,
1323 .send = qcom_glink_send,
1324 .trysend = qcom_glink_trysend,
1325 };
1326
1327 static void qcom_glink_rpdev_release(struct device *dev)
1328 {
1329 struct rpmsg_device *rpdev = to_rpmsg_device(dev);
1330 struct glink_channel *channel = to_glink_channel(rpdev->ept);
1331
1332 channel->rpdev = NULL;
1333 kfree(rpdev);
1334 }
1335
1336 static int qcom_glink_rx_open(struct qcom_glink *glink, unsigned int rcid,
1337 char *name)
1338 {
1339 struct glink_channel *channel;
1340 struct rpmsg_device *rpdev;
1341 bool create_device = false;
1342 struct device_node *node;
1343 int lcid;
1344 int ret;
1345 unsigned long flags;
1346
1347 spin_lock_irqsave(&glink->idr_lock, flags);
1348 idr_for_each_entry(&glink->lcids, channel, lcid) {
1349 if (!strcmp(channel->name, name))
1350 break;
1351 }
1352 spin_unlock_irqrestore(&glink->idr_lock, flags);
1353
1354 if (!channel) {
1355 channel = qcom_glink_alloc_channel(glink, name);
1356 if (IS_ERR(channel))
1357 return PTR_ERR(channel);
1358
1359 /* The opening dance was initiated by the remote */
1360 create_device = true;
1361 }
1362
1363 spin_lock_irqsave(&glink->idr_lock, flags);
1364 ret = idr_alloc(&glink->rcids, channel, rcid, rcid + 1, GFP_ATOMIC);
1365 if (ret < 0) {
1366 dev_err(glink->dev, "Unable to insert channel into rcid list\n");
1367 spin_unlock_irqrestore(&glink->idr_lock, flags);
1368 goto free_channel;
1369 }
1370 channel->rcid = ret;
1371 spin_unlock_irqrestore(&glink->idr_lock, flags);
1372
1373 complete(&channel->open_req);
1374
1375 if (create_device) {
1376 rpdev = kzalloc(sizeof(*rpdev), GFP_KERNEL);
1377 if (!rpdev) {
1378 ret = -ENOMEM;
1379 goto rcid_remove;
1380 }
1381
1382 rpdev->ept = &channel->ept;
1383 strncpy(rpdev->id.name, name, RPMSG_NAME_SIZE);
1384 rpdev->src = RPMSG_ADDR_ANY;
1385 rpdev->dst = RPMSG_ADDR_ANY;
1386 rpdev->ops = &glink_device_ops;
1387
1388 node = qcom_glink_match_channel(glink->dev->of_node, name);
1389 rpdev->dev.of_node = node;
1390 rpdev->dev.parent = glink->dev;
1391 rpdev->dev.release = qcom_glink_rpdev_release;
1392
1393 ret = rpmsg_register_device(rpdev);
1394 if (ret)
1395 goto free_rpdev;
1396
1397 channel->rpdev = rpdev;
1398 }
1399
1400 return 0;
1401
1402 free_rpdev:
1403 kfree(rpdev);
1404 rcid_remove:
1405 spin_lock_irqsave(&glink->idr_lock, flags);
1406 idr_remove(&glink->rcids, channel->rcid);
1407 channel->rcid = 0;
1408 spin_unlock_irqrestore(&glink->idr_lock, flags);
1409 free_channel:
1410 /* Release the reference, iff we took it */
1411 if (create_device)
1412 kref_put(&channel->refcount, qcom_glink_channel_release);
1413
1414 return ret;
1415 }
1416
1417 static void qcom_glink_rx_close(struct qcom_glink *glink, unsigned int rcid)
1418 {
1419 struct rpmsg_channel_info chinfo;
1420 struct glink_channel *channel;
1421 unsigned long flags;
1422
1423 spin_lock_irqsave(&glink->idr_lock, flags);
1424 channel = idr_find(&glink->rcids, rcid);
1425 spin_unlock_irqrestore(&glink->idr_lock, flags);
1426 if (WARN(!channel, "close request on unknown channel\n"))
1427 return;
1428
1429 /* cancel pending rx_done work */
1430 cancel_work_sync(&channel->intent_work);
1431
1432 if (channel->rpdev) {
1433 strncpy(chinfo.name, channel->name, sizeof(chinfo.name));
1434 chinfo.src = RPMSG_ADDR_ANY;
1435 chinfo.dst = RPMSG_ADDR_ANY;
1436
1437 rpmsg_unregister_device(glink->dev, &chinfo);
1438 }
1439
1440 qcom_glink_send_close_ack(glink, channel->rcid);
1441
1442 spin_lock_irqsave(&glink->idr_lock, flags);
1443 idr_remove(&glink->rcids, channel->rcid);
1444 channel->rcid = 0;
1445 spin_unlock_irqrestore(&glink->idr_lock, flags);
1446
1447 kref_put(&channel->refcount, qcom_glink_channel_release);
1448 }
1449
1450 static void qcom_glink_rx_close_ack(struct qcom_glink *glink, unsigned int lcid)
1451 {
1452 struct glink_channel *channel;
1453 unsigned long flags;
1454
1455 spin_lock_irqsave(&glink->idr_lock, flags);
1456 channel = idr_find(&glink->lcids, lcid);
1457 if (WARN(!channel, "close ack on unknown channel\n")) {
1458 spin_unlock_irqrestore(&glink->idr_lock, flags);
1459 return;
1460 }
1461
1462 idr_remove(&glink->lcids, channel->lcid);
1463 channel->lcid = 0;
1464 spin_unlock_irqrestore(&glink->idr_lock, flags);
1465
1466 kref_put(&channel->refcount, qcom_glink_channel_release);
1467 }
1468
1469 static void qcom_glink_work(struct work_struct *work)
1470 {
1471 struct qcom_glink *glink = container_of(work, struct qcom_glink,
1472 rx_work);
1473 struct glink_defer_cmd *dcmd;
1474 struct glink_msg *msg;
1475 unsigned long flags;
1476 unsigned int param1;
1477 unsigned int param2;
1478 unsigned int cmd;
1479
1480 for (;;) {
1481 spin_lock_irqsave(&glink->rx_lock, flags);
1482 if (list_empty(&glink->rx_queue)) {
1483 spin_unlock_irqrestore(&glink->rx_lock, flags);
1484 break;
1485 }
1486 dcmd = list_first_entry(&glink->rx_queue,
1487 struct glink_defer_cmd, node);
1488 list_del(&dcmd->node);
1489 spin_unlock_irqrestore(&glink->rx_lock, flags);
1490
1491 msg = &dcmd->msg;
1492 cmd = le16_to_cpu(msg->cmd);
1493 param1 = le16_to_cpu(msg->param1);
1494 param2 = le32_to_cpu(msg->param2);
1495
1496 switch (cmd) {
1497 case RPM_CMD_VERSION:
1498 qcom_glink_receive_version(glink, param1, param2);
1499 break;
1500 case RPM_CMD_VERSION_ACK:
1501 qcom_glink_receive_version_ack(glink, param1, param2);
1502 break;
1503 case RPM_CMD_OPEN:
1504 qcom_glink_rx_open(glink, param1, msg->data);
1505 break;
1506 case RPM_CMD_CLOSE:
1507 qcom_glink_rx_close(glink, param1);
1508 break;
1509 case RPM_CMD_CLOSE_ACK:
1510 qcom_glink_rx_close_ack(glink, param1);
1511 break;
1512 case RPM_CMD_RX_INTENT_REQ:
1513 qcom_glink_handle_intent_req(glink, param1, param2);
1514 break;
1515 default:
1516 WARN(1, "Unknown defer object %d\n", cmd);
1517 break;
1518 }
1519
1520 kfree(dcmd);
1521 }
1522 }
1523
1524 struct qcom_glink *qcom_glink_native_probe(struct device *dev,
1525 unsigned long features,
1526 struct qcom_glink_pipe *rx,
1527 struct qcom_glink_pipe *tx,
1528 bool intentless)
1529 {
1530 int irq;
1531 int ret;
1532 struct qcom_glink *glink;
1533
1534 glink = devm_kzalloc(dev, sizeof(*glink), GFP_KERNEL);
1535 if (!glink)
1536 return ERR_PTR(-ENOMEM);
1537
1538 glink->dev = dev;
1539 glink->tx_pipe = tx;
1540 glink->rx_pipe = rx;
1541
1542 glink->features = features;
1543 glink->intentless = intentless;
1544
1545 mutex_init(&glink->tx_lock);
1546 spin_lock_init(&glink->rx_lock);
1547 INIT_LIST_HEAD(&glink->rx_queue);
1548 INIT_WORK(&glink->rx_work, qcom_glink_work);
1549
1550 spin_lock_init(&glink->idr_lock);
1551 idr_init(&glink->lcids);
1552 idr_init(&glink->rcids);
1553
1554 glink->mbox_client.dev = dev;
1555 glink->mbox_chan = mbox_request_channel(&glink->mbox_client, 0);
1556 if (IS_ERR(glink->mbox_chan)) {
1557 if (PTR_ERR(glink->mbox_chan) != -EPROBE_DEFER)
1558 dev_err(dev, "failed to acquire IPC channel\n");
1559 return ERR_CAST(glink->mbox_chan);
1560 }
1561
1562 irq = of_irq_get(dev->of_node, 0);
1563 ret = devm_request_irq(dev, irq,
1564 qcom_glink_native_intr,
1565 IRQF_NO_SUSPEND | IRQF_SHARED,
1566 "glink-native", glink);
1567 if (ret) {
1568 dev_err(dev, "failed to request IRQ\n");
1569 return ERR_PTR(ret);
1570 }
1571
1572 glink->irq = irq;
1573
1574 ret = qcom_glink_send_version(glink);
1575 if (ret)
1576 return ERR_PTR(ret);
1577
1578 return glink;
1579 }
1580 EXPORT_SYMBOL_GPL(qcom_glink_native_probe);
1581
1582 static int qcom_glink_remove_device(struct device *dev, void *data)
1583 {
1584 device_unregister(dev);
1585
1586 return 0;
1587 }
1588
1589 void qcom_glink_native_remove(struct qcom_glink *glink)
1590 {
1591 struct glink_channel *channel;
1592 int cid;
1593 int ret;
1594 unsigned long flags;
1595
1596 disable_irq(glink->irq);
1597 cancel_work_sync(&glink->rx_work);
1598
1599 ret = device_for_each_child(glink->dev, NULL, qcom_glink_remove_device);
1600 if (ret)
1601 dev_warn(glink->dev, "Can't remove GLINK devices: %d\n", ret);
1602
1603 spin_lock_irqsave(&glink->idr_lock, flags);
1604 /* Release any defunct local channels, waiting for close-ack */
1605 idr_for_each_entry(&glink->lcids, channel, cid)
1606 kref_put(&channel->refcount, qcom_glink_channel_release);
1607
1608 idr_destroy(&glink->lcids);
1609 idr_destroy(&glink->rcids);
1610 spin_unlock_irqrestore(&glink->idr_lock, flags);
1611 mbox_free_channel(glink->mbox_chan);
1612 }
1613 EXPORT_SYMBOL_GPL(qcom_glink_native_remove);
1614
1615 void qcom_glink_native_unregister(struct qcom_glink *glink)
1616 {
1617 device_unregister(glink->dev);
1618 }
1619 EXPORT_SYMBOL_GPL(qcom_glink_native_unregister);
1620
1621 MODULE_DESCRIPTION("Qualcomm GLINK driver");
1622 MODULE_LICENSE("GPL v2");
Linux with added FPC-III support