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[linux/fpc-iii.git] / drivers / rpmsg / qcom_glink_native.c
blobf46c787733e8ac6ac63cf5eca85a40cad0665272
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Copyright (c) 2016-2017, Linaro Ltd
4 */
5
6 #include <linux/idr.h>
7 #include <linux/interrupt.h>
8 #include <linux/io.h>
9 #include <linux/list.h>
10 #include <linux/mfd/syscon.h>
11 #include <linux/module.h>
12 #include <linux/of.h>
13 #include <linux/of_address.h>
14 #include <linux/of_irq.h>
15 #include <linux/platform_device.h>
16 #include <linux/regmap.h>
17 #include <linux/rpmsg.h>
18 #include <linux/sizes.h>
19 #include <linux/slab.h>
20 #include <linux/workqueue.h>
21 #include <linux/mailbox_client.h>
22
23 #include "rpmsg_internal.h"
24 #include "qcom_glink_native.h"
25
26 #define GLINK_NAME_SIZE 32
27 #define GLINK_VERSION_1 1
28
29 #define RPM_GLINK_CID_MIN 1
30 #define RPM_GLINK_CID_MAX 65536
31
32 struct glink_msg {
33 __le16 cmd;
34 __le16 param1;
35 __le32 param2;
36 u8 data[];
37 } __packed;
38
39 /**
40 * struct glink_defer_cmd - deferred incoming control message
41 * @node: list node
42 * @msg: message header
43 * @data: payload of the message
44 *
45 * Copy of a received control message, to be added to @rx_queue and processed
46 * by @rx_work of @qcom_glink.
47 */
48 struct glink_defer_cmd {
49 struct list_head node;
50
51 struct glink_msg msg;
52 u8 data[];
53 };
54
55 /**
56 * struct glink_core_rx_intent - RX intent
57 * RX intent
58 *
59 * @data: pointer to the data (may be NULL for zero-copy)
60 * @id: remote or local intent ID
61 * @size: size of the original intent (do not modify)
62 * @reuse: To mark if the intent can be reused after first use
63 * @in_use: To mark if intent is already in use for the channel
64 * @offset: next write offset (initially 0)
65 * @node: list node
66 */
67 struct glink_core_rx_intent {
68 void *data;
69 u32 id;
70 size_t size;
71 bool reuse;
72 bool in_use;
73 u32 offset;
74
75 struct list_head node;
76 };
77
78 /**
79 * struct qcom_glink - driver context, relates to one remote subsystem
80 * @dev: reference to the associated struct device
81 * @mbox_client: mailbox client
82 * @mbox_chan: mailbox channel
83 * @rx_pipe: pipe object for receive FIFO
84 * @tx_pipe: pipe object for transmit FIFO
85 * @irq: IRQ for signaling incoming events
86 * @rx_work: worker for handling received control messages
87 * @rx_lock: protects the @rx_queue
88 * @rx_queue: queue of received control messages to be processed in @rx_work
89 * @tx_lock: synchronizes operations on the tx fifo
90 * @idr_lock: synchronizes @lcids and @rcids modifications
91 * @lcids: idr of all channels with a known local channel id
92 * @rcids: idr of all channels with a known remote channel id
93 * @features: remote features
94 * @intentless: flag to indicate that there is no intent
95 */
96 struct qcom_glink {
97 struct device *dev;
98
99 const char *name;
100
101 struct mbox_client mbox_client;
102 struct mbox_chan *mbox_chan;
103
104 struct qcom_glink_pipe *rx_pipe;
105 struct qcom_glink_pipe *tx_pipe;
106
107 int irq;
108
109 struct work_struct rx_work;
110 spinlock_t rx_lock;
111 struct list_head rx_queue;
112
113 spinlock_t tx_lock;
114
115 spinlock_t idr_lock;
116 struct idr lcids;
117 struct idr rcids;
118 unsigned long features;
119
120 bool intentless;
121 };
122
123 enum {
124 GLINK_STATE_CLOSED,
125 GLINK_STATE_OPENING,
126 GLINK_STATE_OPEN,
127 GLINK_STATE_CLOSING,
128 };
129
130 /**
131 * struct glink_channel - internal representation of a channel
132 * @rpdev: rpdev reference, only used for primary endpoints
133 * @ept: rpmsg endpoint this channel is associated with
134 * @glink: qcom_glink context handle
135 * @refcount: refcount for the channel object
136 * @recv_lock: guard for @ept.cb
137 * @name: unique channel name/identifier
138 * @lcid: channel id, in local space
139 * @rcid: channel id, in remote space
140 * @intent_lock: lock for protection of @liids, @riids
141 * @liids: idr of all local intents
142 * @riids: idr of all remote intents
143 * @intent_work: worker responsible for transmitting rx_done packets
144 * @done_intents: list of intents that needs to be announced rx_done
145 * @buf: receive buffer, for gathering fragments
146 * @buf_offset: write offset in @buf
147 * @buf_size: size of current @buf
148 * @open_ack: completed once remote has acked the open-request
149 * @open_req: completed once open-request has been received
150 * @intent_req_lock: Synchronises multiple intent requests
151 * @intent_req_result: Result of intent request
152 * @intent_req_comp: Completion for intent_req signalling
153 */
154 struct glink_channel {
155 struct rpmsg_endpoint ept;
156
157 struct rpmsg_device *rpdev;
158 struct qcom_glink *glink;
159
160 struct kref refcount;
161
162 spinlock_t recv_lock;
163
164 char *name;
165 unsigned int lcid;
166 unsigned int rcid;
167
168 spinlock_t intent_lock;
169 struct idr liids;
170 struct idr riids;
171 struct work_struct intent_work;
172 struct list_head done_intents;
173
174 struct glink_core_rx_intent *buf;
175 int buf_offset;
176 int buf_size;
177
178 struct completion open_ack;
179 struct completion open_req;
180
181 struct mutex intent_req_lock;
182 bool intent_req_result;
183 struct completion intent_req_comp;
184 };
185
186 #define to_glink_channel(_ept) container_of(_ept, struct glink_channel, ept)
187
188 static const struct rpmsg_endpoint_ops glink_endpoint_ops;
189
190 #define RPM_CMD_VERSION 0
191 #define RPM_CMD_VERSION_ACK 1
192 #define RPM_CMD_OPEN 2
193 #define RPM_CMD_CLOSE 3
194 #define RPM_CMD_OPEN_ACK 4
195 #define RPM_CMD_INTENT 5
196 #define RPM_CMD_RX_DONE 6
197 #define RPM_CMD_RX_INTENT_REQ 7
198 #define RPM_CMD_RX_INTENT_REQ_ACK 8
199 #define RPM_CMD_TX_DATA 9
200 #define RPM_CMD_CLOSE_ACK 11
201 #define RPM_CMD_TX_DATA_CONT 12
202 #define RPM_CMD_READ_NOTIF 13
203 #define RPM_CMD_RX_DONE_W_REUSE 14
204
205 #define GLINK_FEATURE_INTENTLESS BIT(1)
206
207 static void qcom_glink_rx_done_work(struct work_struct *work);
208
209 static struct glink_channel *qcom_glink_alloc_channel(struct qcom_glink *glink,
210 const char *name)
211 {
212 struct glink_channel *channel;
213
214 channel = kzalloc(sizeof(*channel), GFP_KERNEL);
215 if (!channel)
216 return ERR_PTR(-ENOMEM);
217
218 /* Setup glink internal glink_channel data */
219 spin_lock_init(&channel->recv_lock);
220 spin_lock_init(&channel->intent_lock);
221 mutex_init(&channel->intent_req_lock);
222
223 channel->glink = glink;
224 channel->name = kstrdup(name, GFP_KERNEL);
225
226 init_completion(&channel->open_req);
227 init_completion(&channel->open_ack);
228 init_completion(&channel->intent_req_comp);
229
230 INIT_LIST_HEAD(&channel->done_intents);
231 INIT_WORK(&channel->intent_work, qcom_glink_rx_done_work);
232
233 idr_init(&channel->liids);
234 idr_init(&channel->riids);
235 kref_init(&channel->refcount);
236
237 return channel;
238 }
239
240 static void qcom_glink_channel_release(struct kref *ref)
241 {
242 struct glink_channel *channel = container_of(ref, struct glink_channel,
243 refcount);
244 unsigned long flags;
245
246 spin_lock_irqsave(&channel->intent_lock, flags);
247 idr_destroy(&channel->liids);
248 idr_destroy(&channel->riids);
249 spin_unlock_irqrestore(&channel->intent_lock, flags);
250
251 kfree(channel->name);
252 kfree(channel);
253 }
254
255 static size_t qcom_glink_rx_avail(struct qcom_glink *glink)
256 {
257 return glink->rx_pipe->avail(glink->rx_pipe);
258 }
259
260 static void qcom_glink_rx_peak(struct qcom_glink *glink,
261 void *data, unsigned int offset, size_t count)
262 {
263 glink->rx_pipe->peak(glink->rx_pipe, data, offset, count);
264 }
265
266 static void qcom_glink_rx_advance(struct qcom_glink *glink, size_t count)
267 {
268 glink->rx_pipe->advance(glink->rx_pipe, count);
269 }
270
271 static size_t qcom_glink_tx_avail(struct qcom_glink *glink)
272 {
273 return glink->tx_pipe->avail(glink->tx_pipe);
274 }
275
276 static void qcom_glink_tx_write(struct qcom_glink *glink,
277 const void *hdr, size_t hlen,
278 const void *data, size_t dlen)
279 {
280 glink->tx_pipe->write(glink->tx_pipe, hdr, hlen, data, dlen);
281 }
282
283 static int qcom_glink_tx(struct qcom_glink *glink,
284 const void *hdr, size_t hlen,
285 const void *data, size_t dlen, bool wait)
286 {
287 unsigned int tlen = hlen + dlen;
288 unsigned long flags;
289 int ret = 0;
290
291 /* Reject packets that are too big */
292 if (tlen >= glink->tx_pipe->length)
293 return -EINVAL;
294
295 spin_lock_irqsave(&glink->tx_lock, flags);
296
297 while (qcom_glink_tx_avail(glink) < tlen) {
298 if (!wait) {
299 ret = -EAGAIN;
300 goto out;
301 }
302
303 /* Wait without holding the tx_lock */
304 spin_unlock_irqrestore(&glink->tx_lock, flags);
305
306 usleep_range(10000, 15000);
307
308 spin_lock_irqsave(&glink->tx_lock, flags);
309 }
310
311 qcom_glink_tx_write(glink, hdr, hlen, data, dlen);
312
313 mbox_send_message(glink->mbox_chan, NULL);
314 mbox_client_txdone(glink->mbox_chan, 0);
315
316 out:
317 spin_unlock_irqrestore(&glink->tx_lock, flags);
318
319 return ret;
320 }
321
322 static int qcom_glink_send_version(struct qcom_glink *glink)
323 {
324 struct glink_msg msg;
325
326 msg.cmd = cpu_to_le16(RPM_CMD_VERSION);
327 msg.param1 = cpu_to_le16(GLINK_VERSION_1);
328 msg.param2 = cpu_to_le32(glink->features);
329
330 return qcom_glink_tx(glink, &msg, sizeof(msg), NULL, 0, true);
331 }
332
333 static void qcom_glink_send_version_ack(struct qcom_glink *glink)
334 {
335 struct glink_msg msg;
336
337 msg.cmd = cpu_to_le16(RPM_CMD_VERSION_ACK);
338 msg.param1 = cpu_to_le16(GLINK_VERSION_1);
339 msg.param2 = cpu_to_le32(glink->features);
340
341 qcom_glink_tx(glink, &msg, sizeof(msg), NULL, 0, true);
342 }
343
344 static void qcom_glink_send_open_ack(struct qcom_glink *glink,
345 struct glink_channel *channel)
346 {
347 struct glink_msg msg;
348
349 msg.cmd = cpu_to_le16(RPM_CMD_OPEN_ACK);
350 msg.param1 = cpu_to_le16(channel->rcid);
351 msg.param2 = cpu_to_le32(0);
352
353 qcom_glink_tx(glink, &msg, sizeof(msg), NULL, 0, true);
354 }
355
356 static void qcom_glink_handle_intent_req_ack(struct qcom_glink *glink,
357 unsigned int cid, bool granted)
358 {
359 struct glink_channel *channel;
360 unsigned long flags;
361
362 spin_lock_irqsave(&glink->idr_lock, flags);
363 channel = idr_find(&glink->rcids, cid);
364 spin_unlock_irqrestore(&glink->idr_lock, flags);
365 if (!channel) {
366 dev_err(glink->dev, "unable to find channel\n");
367 return;
368 }
369
370 channel->intent_req_result = granted;
371 complete(&channel->intent_req_comp);
372 }
373
374 /**
375 * qcom_glink_send_open_req() - send a RPM_CMD_OPEN request to the remote
376 * @glink: Ptr to the glink edge
377 * @channel: Ptr to the channel that the open req is sent
378 *
379 * Allocates a local channel id and sends a RPM_CMD_OPEN message to the remote.
380 * Will return with refcount held, regardless of outcome.
381 *
382 * Returns 0 on success, negative errno otherwise.
383 */
384 static int qcom_glink_send_open_req(struct qcom_glink *glink,
385 struct glink_channel *channel)
386 {
387 struct {
388 struct glink_msg msg;
389 u8 name[GLINK_NAME_SIZE];
390 } __packed req;
391 int name_len = strlen(channel->name) + 1;
392 int req_len = ALIGN(sizeof(req.msg) + name_len, 8);
393 int ret;
394 unsigned long flags;
395
396 kref_get(&channel->refcount);
397
398 spin_lock_irqsave(&glink->idr_lock, flags);
399 ret = idr_alloc_cyclic(&glink->lcids, channel,
400 RPM_GLINK_CID_MIN, RPM_GLINK_CID_MAX,
401 GFP_ATOMIC);
402 spin_unlock_irqrestore(&glink->idr_lock, flags);
403 if (ret < 0)
404 return ret;
405
406 channel->lcid = ret;
407
408 req.msg.cmd = cpu_to_le16(RPM_CMD_OPEN);
409 req.msg.param1 = cpu_to_le16(channel->lcid);
410 req.msg.param2 = cpu_to_le32(name_len);
411 strcpy(req.name, channel->name);
412
413 ret = qcom_glink_tx(glink, &req, req_len, NULL, 0, true);
414 if (ret)
415 goto remove_idr;
416
417 return 0;
418
419 remove_idr:
420 spin_lock_irqsave(&glink->idr_lock, flags);
421 idr_remove(&glink->lcids, channel->lcid);
422 channel->lcid = 0;
423 spin_unlock_irqrestore(&glink->idr_lock, flags);
424
425 return ret;
426 }
427
428 static void qcom_glink_send_close_req(struct qcom_glink *glink,
429 struct glink_channel *channel)
430 {
431 struct glink_msg req;
432
433 req.cmd = cpu_to_le16(RPM_CMD_CLOSE);
434 req.param1 = cpu_to_le16(channel->lcid);
435 req.param2 = 0;
436
437 qcom_glink_tx(glink, &req, sizeof(req), NULL, 0, true);
438 }
439
440 static void qcom_glink_send_close_ack(struct qcom_glink *glink,
441 unsigned int rcid)
442 {
443 struct glink_msg req;
444
445 req.cmd = cpu_to_le16(RPM_CMD_CLOSE_ACK);
446 req.param1 = cpu_to_le16(rcid);
447 req.param2 = 0;
448
449 qcom_glink_tx(glink, &req, sizeof(req), NULL, 0, true);
450 }
451
452 static void qcom_glink_rx_done_work(struct work_struct *work)
453 {
454 struct glink_channel *channel = container_of(work, struct glink_channel,
455 intent_work);
456 struct qcom_glink *glink = channel->glink;
457 struct glink_core_rx_intent *intent, *tmp;
458 struct {
459 u16 id;
460 u16 lcid;
461 u32 liid;
462 } __packed cmd;
463
464 unsigned int cid = channel->lcid;
465 unsigned int iid;
466 bool reuse;
467 unsigned long flags;
468
469 spin_lock_irqsave(&channel->intent_lock, flags);
470 list_for_each_entry_safe(intent, tmp, &channel->done_intents, node) {
471 list_del(&intent->node);
472 spin_unlock_irqrestore(&channel->intent_lock, flags);
473 iid = intent->id;
474 reuse = intent->reuse;
475
476 cmd.id = reuse ? RPM_CMD_RX_DONE_W_REUSE : RPM_CMD_RX_DONE;
477 cmd.lcid = cid;
478 cmd.liid = iid;
479
480 qcom_glink_tx(glink, &cmd, sizeof(cmd), NULL, 0, true);
481 if (!reuse) {
482 kfree(intent->data);
483 kfree(intent);
484 }
485 spin_lock_irqsave(&channel->intent_lock, flags);
486 }
487 spin_unlock_irqrestore(&channel->intent_lock, flags);
488 }
489
490 static void qcom_glink_rx_done(struct qcom_glink *glink,
491 struct glink_channel *channel,
492 struct glink_core_rx_intent *intent)
493 {
494 /* We don't send RX_DONE to intentless systems */
495 if (glink->intentless) {
496 kfree(intent->data);
497 kfree(intent);
498 return;
499 }
500
501 /* Take it off the tree of receive intents */
502 if (!intent->reuse) {
503 spin_lock(&channel->intent_lock);
504 idr_remove(&channel->liids, intent->id);
505 spin_unlock(&channel->intent_lock);
506 }
507
508 /* Schedule the sending of a rx_done indication */
509 spin_lock(&channel->intent_lock);
510 list_add_tail(&intent->node, &channel->done_intents);
511 spin_unlock(&channel->intent_lock);
512
513 schedule_work(&channel->intent_work);
514 }
515
516 /**
517 * qcom_glink_receive_version() - receive version/features from remote system
518 *
519 * @glink: pointer to transport interface
520 * @version: remote version
521 * @features: remote features
522 *
523 * This function is called in response to a remote-initiated version/feature
524 * negotiation sequence.
525 */
526 static void qcom_glink_receive_version(struct qcom_glink *glink,
527 u32 version,
528 u32 features)
529 {
530 switch (version) {
531 case 0:
532 break;
533 case GLINK_VERSION_1:
534 glink->features &= features;
535 /* FALLTHROUGH */
536 default:
537 qcom_glink_send_version_ack(glink);
538 break;
539 }
540 }
541
542 /**
543 * qcom_glink_receive_version_ack() - receive negotiation ack from remote system
544 *
545 * @glink: pointer to transport interface
546 * @version: remote version response
547 * @features: remote features response
548 *
549 * This function is called in response to a local-initiated version/feature
550 * negotiation sequence and is the counter-offer from the remote side based
551 * upon the initial version and feature set requested.
552 */
553 static void qcom_glink_receive_version_ack(struct qcom_glink *glink,
554 u32 version,
555 u32 features)
556 {
557 switch (version) {
558 case 0:
559 /* Version negotiation failed */
560 break;
561 case GLINK_VERSION_1:
562 if (features == glink->features)
563 break;
564
565 glink->features &= features;
566 /* FALLTHROUGH */
567 default:
568 qcom_glink_send_version(glink);
569 break;
570 }
571 }
572
573 /**
574 * qcom_glink_send_intent_req_ack() - convert an rx intent request ack cmd to
575 * wire format and transmit
576 * @glink: The transport to transmit on.
577 * @channel: The glink channel
578 * @granted: The request response to encode.
579 *
580 * Return: 0 on success or standard Linux error code.
581 */
582 static int qcom_glink_send_intent_req_ack(struct qcom_glink *glink,
583 struct glink_channel *channel,
584 bool granted)
585 {
586 struct glink_msg msg;
587
588 msg.cmd = cpu_to_le16(RPM_CMD_RX_INTENT_REQ_ACK);
589 msg.param1 = cpu_to_le16(channel->lcid);
590 msg.param2 = cpu_to_le32(granted);
591
592 qcom_glink_tx(glink, &msg, sizeof(msg), NULL, 0, true);
593
594 return 0;
595 }
596
597 /**
598 * qcom_glink_advertise_intent - convert an rx intent cmd to wire format and
599 * transmit
600 * @glink: The transport to transmit on.
601 * @channel: The local channel
602 * @intent: The intent to pass on to remote.
603 *
604 * Return: 0 on success or standard Linux error code.
605 */
606 static int qcom_glink_advertise_intent(struct qcom_glink *glink,
607 struct glink_channel *channel,
608 struct glink_core_rx_intent *intent)
609 {
610 struct command {
611 __le16 id;
612 __le16 lcid;
613 __le32 count;
614 __le32 size;
615 __le32 liid;
616 } __packed;
617 struct command cmd;
618
619 cmd.id = cpu_to_le16(RPM_CMD_INTENT);
620 cmd.lcid = cpu_to_le16(channel->lcid);
621 cmd.count = cpu_to_le32(1);
622 cmd.size = cpu_to_le32(intent->size);
623 cmd.liid = cpu_to_le32(intent->id);
624
625 qcom_glink_tx(glink, &cmd, sizeof(cmd), NULL, 0, true);
626
627 return 0;
628 }
629
630 static struct glink_core_rx_intent *
631 qcom_glink_alloc_intent(struct qcom_glink *glink,
632 struct glink_channel *channel,
633 size_t size,
634 bool reuseable)
635 {
636 struct glink_core_rx_intent *intent;
637 int ret;
638 unsigned long flags;
639
640 intent = kzalloc(sizeof(*intent), GFP_KERNEL);
641 if (!intent)
642 return NULL;
643
644 intent->data = kzalloc(size, GFP_KERNEL);
645 if (!intent->data)
646 goto free_intent;
647
648 spin_lock_irqsave(&channel->intent_lock, flags);
649 ret = idr_alloc_cyclic(&channel->liids, intent, 1, -1, GFP_ATOMIC);
650 if (ret < 0) {
651 spin_unlock_irqrestore(&channel->intent_lock, flags);
652 goto free_data;
653 }
654 spin_unlock_irqrestore(&channel->intent_lock, flags);
655
656 intent->id = ret;
657 intent->size = size;
658 intent->reuse = reuseable;
659
660 return intent;
661
662 free_data:
663 kfree(intent->data);
664 free_intent:
665 kfree(intent);
666 return NULL;
667 }
668
669 static void qcom_glink_handle_rx_done(struct qcom_glink *glink,
670 u32 cid, uint32_t iid,
671 bool reuse)
672 {
673 struct glink_core_rx_intent *intent;
674 struct glink_channel *channel;
675 unsigned long flags;
676
677 spin_lock_irqsave(&glink->idr_lock, flags);
678 channel = idr_find(&glink->rcids, cid);
679 spin_unlock_irqrestore(&glink->idr_lock, flags);
680 if (!channel) {
681 dev_err(glink->dev, "invalid channel id received\n");
682 return;
683 }
684
685 spin_lock_irqsave(&channel->intent_lock, flags);
686 intent = idr_find(&channel->riids, iid);
687
688 if (!intent) {
689 spin_unlock_irqrestore(&channel->intent_lock, flags);
690 dev_err(glink->dev, "invalid intent id received\n");
691 return;
692 }
693
694 intent->in_use = false;
695
696 if (!reuse) {
697 idr_remove(&channel->riids, intent->id);
698 kfree(intent);
699 }
700 spin_unlock_irqrestore(&channel->intent_lock, flags);
701 }
702
703 /**
704 * qcom_glink_handle_intent_req() - Receive a request for rx_intent
705 * from remote side
706 * @glink: Pointer to the transport interface
707 * @cid: Remote channel ID
708 * @size: size of the intent
709 *
710 * The function searches for the local channel to which the request for
711 * rx_intent has arrived and allocates and notifies the remote back
712 */
713 static void qcom_glink_handle_intent_req(struct qcom_glink *glink,
714 u32 cid, size_t size)
715 {
716 struct glink_core_rx_intent *intent;
717 struct glink_channel *channel;
718 unsigned long flags;
719
720 spin_lock_irqsave(&glink->idr_lock, flags);
721 channel = idr_find(&glink->rcids, cid);
722 spin_unlock_irqrestore(&glink->idr_lock, flags);
723
724 if (!channel) {
725 pr_err("%s channel not found for cid %d\n", __func__, cid);
726 return;
727 }
728
729 intent = qcom_glink_alloc_intent(glink, channel, size, false);
730 if (intent)
731 qcom_glink_advertise_intent(glink, channel, intent);
732
733 qcom_glink_send_intent_req_ack(glink, channel, !!intent);
734 }
735
736 static int qcom_glink_rx_defer(struct qcom_glink *glink, size_t extra)
737 {
738 struct glink_defer_cmd *dcmd;
739
740 extra = ALIGN(extra, 8);
741
742 if (qcom_glink_rx_avail(glink) < sizeof(struct glink_msg) + extra) {
743 dev_dbg(glink->dev, "Insufficient data in rx fifo");
744 return -ENXIO;
745 }
746
747 dcmd = kzalloc(sizeof(*dcmd) + extra, GFP_ATOMIC);
748 if (!dcmd)
749 return -ENOMEM;
750
751 INIT_LIST_HEAD(&dcmd->node);
752
753 qcom_glink_rx_peak(glink, &dcmd->msg, 0, sizeof(dcmd->msg) + extra);
754
755 spin_lock(&glink->rx_lock);
756 list_add_tail(&dcmd->node, &glink->rx_queue);
757 spin_unlock(&glink->rx_lock);
758
759 schedule_work(&glink->rx_work);
760 qcom_glink_rx_advance(glink, sizeof(dcmd->msg) + extra);
761
762 return 0;
763 }
764
765 static int qcom_glink_rx_data(struct qcom_glink *glink, size_t avail)
766 {
767 struct glink_core_rx_intent *intent;
768 struct glink_channel *channel;
769 struct {
770 struct glink_msg msg;
771 __le32 chunk_size;
772 __le32 left_size;
773 } __packed hdr;
774 unsigned int chunk_size;
775 unsigned int left_size;
776 unsigned int rcid;
777 unsigned int liid;
778 int ret = 0;
779 unsigned long flags;
780
781 if (avail < sizeof(hdr)) {
782 dev_dbg(glink->dev, "Not enough data in fifo\n");
783 return -EAGAIN;
784 }
785
786 qcom_glink_rx_peak(glink, &hdr, 0, sizeof(hdr));
787 chunk_size = le32_to_cpu(hdr.chunk_size);
788 left_size = le32_to_cpu(hdr.left_size);
789
790 if (avail < sizeof(hdr) + chunk_size) {
791 dev_dbg(glink->dev, "Payload not yet in fifo\n");
792 return -EAGAIN;
793 }
794
795 rcid = le16_to_cpu(hdr.msg.param1);
796 spin_lock_irqsave(&glink->idr_lock, flags);
797 channel = idr_find(&glink->rcids, rcid);
798 spin_unlock_irqrestore(&glink->idr_lock, flags);
799 if (!channel) {
800 dev_dbg(glink->dev, "Data on non-existing channel\n");
801
802 /* Drop the message */
803 goto advance_rx;
804 }
805
806 if (glink->intentless) {
807 /* Might have an ongoing, fragmented, message to append */
808 if (!channel->buf) {
809 intent = kzalloc(sizeof(*intent), GFP_ATOMIC);
810 if (!intent)
811 return -ENOMEM;
812
813 intent->data = kmalloc(chunk_size + left_size,
814 GFP_ATOMIC);
815 if (!intent->data) {
816 kfree(intent);
817 return -ENOMEM;
818 }
819
820 intent->id = 0xbabababa;
821 intent->size = chunk_size + left_size;
822 intent->offset = 0;
823
824 channel->buf = intent;
825 } else {
826 intent = channel->buf;
827 }
828 } else {
829 liid = le32_to_cpu(hdr.msg.param2);
830
831 spin_lock_irqsave(&channel->intent_lock, flags);
832 intent = idr_find(&channel->liids, liid);
833 spin_unlock_irqrestore(&channel->intent_lock, flags);
834
835 if (!intent) {
836 dev_err(glink->dev,
837 "no intent found for channel %s intent %d",
838 channel->name, liid);
839 goto advance_rx;
840 }
841 }
842
843 if (intent->size - intent->offset < chunk_size) {
844 dev_err(glink->dev, "Insufficient space in intent\n");
845
846 /* The packet header lied, drop payload */
847 goto advance_rx;
848 }
849
850 qcom_glink_rx_peak(glink, intent->data + intent->offset,
851 sizeof(hdr), chunk_size);
852 intent->offset += chunk_size;
853
854 /* Handle message when no fragments remain to be received */
855 if (!left_size) {
856 spin_lock(&channel->recv_lock);
857 if (channel->ept.cb) {
858 channel->ept.cb(channel->ept.rpdev,
859 intent->data,
860 intent->offset,
861 channel->ept.priv,
862 RPMSG_ADDR_ANY);
863 }
864 spin_unlock(&channel->recv_lock);
865
866 intent->offset = 0;
867 channel->buf = NULL;
868
869 qcom_glink_rx_done(glink, channel, intent);
870 }
871
872 advance_rx:
873 qcom_glink_rx_advance(glink, ALIGN(sizeof(hdr) + chunk_size, 8));
874
875 return ret;
876 }
877
878 static void qcom_glink_handle_intent(struct qcom_glink *glink,
879 unsigned int cid,
880 unsigned int count,
881 size_t avail)
882 {
883 struct glink_core_rx_intent *intent;
884 struct glink_channel *channel;
885 struct intent_pair {
886 __le32 size;
887 __le32 iid;
888 };
889
890 struct {
891 struct glink_msg msg;
892 struct intent_pair intents[];
893 } __packed * msg;
894
895 const size_t msglen = sizeof(*msg) + sizeof(struct intent_pair) * count;
896 int ret;
897 int i;
898 unsigned long flags;
899
900 if (avail < msglen) {
901 dev_dbg(glink->dev, "Not enough data in fifo\n");
902 return;
903 }
904
905 spin_lock_irqsave(&glink->idr_lock, flags);
906 channel = idr_find(&glink->rcids, cid);
907 spin_unlock_irqrestore(&glink->idr_lock, flags);
908 if (!channel) {
909 dev_err(glink->dev, "intents for non-existing channel\n");
910 return;
911 }
912
913 msg = kmalloc(msglen, GFP_ATOMIC);
914 if (!msg)
915 return;
916
917 qcom_glink_rx_peak(glink, msg, 0, msglen);
918
919 for (i = 0; i < count; ++i) {
920 intent = kzalloc(sizeof(*intent), GFP_ATOMIC);
921 if (!intent)
922 break;
923
924 intent->id = le32_to_cpu(msg->intents[i].iid);
925 intent->size = le32_to_cpu(msg->intents[i].size);
926
927 spin_lock_irqsave(&channel->intent_lock, flags);
928 ret = idr_alloc(&channel->riids, intent,
929 intent->id, intent->id + 1, GFP_ATOMIC);
930 spin_unlock_irqrestore(&channel->intent_lock, flags);
931
932 if (ret < 0)
933 dev_err(glink->dev, "failed to store remote intent\n");
934 }
935
936 kfree(msg);
937 qcom_glink_rx_advance(glink, ALIGN(msglen, 8));
938 }
939
940 static int qcom_glink_rx_open_ack(struct qcom_glink *glink, unsigned int lcid)
941 {
942 struct glink_channel *channel;
943
944 spin_lock(&glink->idr_lock);
945 channel = idr_find(&glink->lcids, lcid);
946 spin_unlock(&glink->idr_lock);
947 if (!channel) {
948 dev_err(glink->dev, "Invalid open ack packet\n");
949 return -EINVAL;
950 }
951
952 complete(&channel->open_ack);
953
954 return 0;
955 }
956
957 static irqreturn_t qcom_glink_native_intr(int irq, void *data)
958 {
959 struct qcom_glink *glink = data;
960 struct glink_msg msg;
961 unsigned int param1;
962 unsigned int param2;
963 unsigned int avail;
964 unsigned int cmd;
965 int ret = 0;
966
967 for (;;) {
968 avail = qcom_glink_rx_avail(glink);
969 if (avail < sizeof(msg))
970 break;
971
972 qcom_glink_rx_peak(glink, &msg, 0, sizeof(msg));
973
974 cmd = le16_to_cpu(msg.cmd);
975 param1 = le16_to_cpu(msg.param1);
976 param2 = le32_to_cpu(msg.param2);
977
978 switch (cmd) {
979 case RPM_CMD_VERSION:
980 case RPM_CMD_VERSION_ACK:
981 case RPM_CMD_CLOSE:
982 case RPM_CMD_CLOSE_ACK:
983 case RPM_CMD_RX_INTENT_REQ:
984 ret = qcom_glink_rx_defer(glink, 0);
985 break;
986 case RPM_CMD_OPEN_ACK:
987 ret = qcom_glink_rx_open_ack(glink, param1);
988 qcom_glink_rx_advance(glink, ALIGN(sizeof(msg), 8));
989 break;
990 case RPM_CMD_OPEN:
991 ret = qcom_glink_rx_defer(glink, param2);
992 break;
993 case RPM_CMD_TX_DATA:
994 case RPM_CMD_TX_DATA_CONT:
995 ret = qcom_glink_rx_data(glink, avail);
996 break;
997 case RPM_CMD_READ_NOTIF:
998 qcom_glink_rx_advance(glink, ALIGN(sizeof(msg), 8));
999
1000 mbox_send_message(glink->mbox_chan, NULL);
1001 mbox_client_txdone(glink->mbox_chan, 0);
1002 break;
1003 case RPM_CMD_INTENT:
1004 qcom_glink_handle_intent(glink, param1, param2, avail);
1005 break;
1006 case RPM_CMD_RX_DONE:
1007 qcom_glink_handle_rx_done(glink, param1, param2, false);
1008 qcom_glink_rx_advance(glink, ALIGN(sizeof(msg), 8));
1009 break;
1010 case RPM_CMD_RX_DONE_W_REUSE:
1011 qcom_glink_handle_rx_done(glink, param1, param2, true);
1012 qcom_glink_rx_advance(glink, ALIGN(sizeof(msg), 8));
1013 break;
1014 case RPM_CMD_RX_INTENT_REQ_ACK:
1015 qcom_glink_handle_intent_req_ack(glink, param1, param2);
1016 qcom_glink_rx_advance(glink, ALIGN(sizeof(msg), 8));
1017 break;
1018 default:
1019 dev_err(glink->dev, "unhandled rx cmd: %d\n", cmd);
1020 ret = -EINVAL;
1021 break;
1022 }
1023
1024 if (ret)
1025 break;
1026 }
1027
1028 return IRQ_HANDLED;
1029 }
1030
1031 /* Locally initiated rpmsg_create_ept */
1032 static struct glink_channel *qcom_glink_create_local(struct qcom_glink *glink,
1033 const char *name)
1034 {
1035 struct glink_channel *channel;
1036 int ret;
1037 unsigned long flags;
1038
1039 channel = qcom_glink_alloc_channel(glink, name);
1040 if (IS_ERR(channel))
1041 return ERR_CAST(channel);
1042
1043 ret = qcom_glink_send_open_req(glink, channel);
1044 if (ret)
1045 goto release_channel;
1046
1047 ret = wait_for_completion_timeout(&channel->open_ack, 5 * HZ);
1048 if (!ret)
1049 goto err_timeout;
1050
1051 ret = wait_for_completion_timeout(&channel->open_req, 5 * HZ);
1052 if (!ret)
1053 goto err_timeout;
1054
1055 qcom_glink_send_open_ack(glink, channel);
1056
1057 return channel;
1058
1059 err_timeout:
1060 /* qcom_glink_send_open_req() did register the channel in lcids*/
1061 spin_lock_irqsave(&glink->idr_lock, flags);
1062 idr_remove(&glink->lcids, channel->lcid);
1063 spin_unlock_irqrestore(&glink->idr_lock, flags);
1064
1065 release_channel:
1066 /* Release qcom_glink_send_open_req() reference */
1067 kref_put(&channel->refcount, qcom_glink_channel_release);
1068 /* Release qcom_glink_alloc_channel() reference */
1069 kref_put(&channel->refcount, qcom_glink_channel_release);
1070
1071 return ERR_PTR(-ETIMEDOUT);
1072 }
1073
1074 /* Remote initiated rpmsg_create_ept */
1075 static int qcom_glink_create_remote(struct qcom_glink *glink,
1076 struct glink_channel *channel)
1077 {
1078 int ret;
1079
1080 qcom_glink_send_open_ack(glink, channel);
1081
1082 ret = qcom_glink_send_open_req(glink, channel);
1083 if (ret)
1084 goto close_link;
1085
1086 ret = wait_for_completion_timeout(&channel->open_ack, 5 * HZ);
1087 if (!ret) {
1088 ret = -ETIMEDOUT;
1089 goto close_link;
1090 }
1091
1092 return 0;
1093
1094 close_link:
1095 /*
1096 * Send a close request to "undo" our open-ack. The close-ack will
1097 * release the last reference.
1098 */
1099 qcom_glink_send_close_req(glink, channel);
1100
1101 /* Release qcom_glink_send_open_req() reference */
1102 kref_put(&channel->refcount, qcom_glink_channel_release);
1103
1104 return ret;
1105 }
1106
1107 static struct rpmsg_endpoint *qcom_glink_create_ept(struct rpmsg_device *rpdev,
1108 rpmsg_rx_cb_t cb,
1109 void *priv,
1110 struct rpmsg_channel_info
1111 chinfo)
1112 {
1113 struct glink_channel *parent = to_glink_channel(rpdev->ept);
1114 struct glink_channel *channel;
1115 struct qcom_glink *glink = parent->glink;
1116 struct rpmsg_endpoint *ept;
1117 const char *name = chinfo.name;
1118 int cid;
1119 int ret;
1120 unsigned long flags;
1121
1122 spin_lock_irqsave(&glink->idr_lock, flags);
1123 idr_for_each_entry(&glink->rcids, channel, cid) {
1124 if (!strcmp(channel->name, name))
1125 break;
1126 }
1127 spin_unlock_irqrestore(&glink->idr_lock, flags);
1128
1129 if (!channel) {
1130 channel = qcom_glink_create_local(glink, name);
1131 if (IS_ERR(channel))
1132 return NULL;
1133 } else {
1134 ret = qcom_glink_create_remote(glink, channel);
1135 if (ret)
1136 return NULL;
1137 }
1138
1139 ept = &channel->ept;
1140 ept->rpdev = rpdev;
1141 ept->cb = cb;
1142 ept->priv = priv;
1143 ept->ops = &glink_endpoint_ops;
1144
1145 return ept;
1146 }
1147
1148 static int qcom_glink_announce_create(struct rpmsg_device *rpdev)
1149 {
1150 struct glink_channel *channel = to_glink_channel(rpdev->ept);
1151 struct device_node *np = rpdev->dev.of_node;
1152 struct qcom_glink *glink = channel->glink;
1153 struct glink_core_rx_intent *intent;
1154 const struct property *prop = NULL;
1155 __be32 defaults[] = { cpu_to_be32(SZ_1K), cpu_to_be32(5) };
1156 int num_intents;
1157 int num_groups = 1;
1158 __be32 *val = defaults;
1159 int size;
1160
1161 if (glink->intentless)
1162 return 0;
1163
1164 prop = of_find_property(np, "qcom,intents", NULL);
1165 if (prop) {
1166 val = prop->value;
1167 num_groups = prop->length / sizeof(u32) / 2;
1168 }
1169
1170 /* Channel is now open, advertise base set of intents */
1171 while (num_groups--) {
1172 size = be32_to_cpup(val++);
1173 num_intents = be32_to_cpup(val++);
1174 while (num_intents--) {
1175 intent = qcom_glink_alloc_intent(glink, channel, size,
1176 true);
1177 if (!intent)
1178 break;
1179
1180 qcom_glink_advertise_intent(glink, channel, intent);
1181 }
1182 }
1183 return 0;
1184 }
1185
1186 static void qcom_glink_destroy_ept(struct rpmsg_endpoint *ept)
1187 {
1188 struct glink_channel *channel = to_glink_channel(ept);
1189 struct qcom_glink *glink = channel->glink;
1190 unsigned long flags;
1191
1192 spin_lock_irqsave(&channel->recv_lock, flags);
1193 channel->ept.cb = NULL;
1194 spin_unlock_irqrestore(&channel->recv_lock, flags);
1195
1196 /* Decouple the potential rpdev from the channel */
1197 channel->rpdev = NULL;
1198
1199 qcom_glink_send_close_req(glink, channel);
1200 }
1201
1202 static int qcom_glink_request_intent(struct qcom_glink *glink,
1203 struct glink_channel *channel,
1204 size_t size)
1205 {
1206 struct {
1207 u16 id;
1208 u16 cid;
1209 u32 size;
1210 } __packed cmd;
1211
1212 int ret;
1213
1214 mutex_lock(&channel->intent_req_lock);
1215
1216 reinit_completion(&channel->intent_req_comp);
1217
1218 cmd.id = RPM_CMD_RX_INTENT_REQ;
1219 cmd.cid = channel->lcid;
1220 cmd.size = size;
1221
1222 ret = qcom_glink_tx(glink, &cmd, sizeof(cmd), NULL, 0, true);
1223 if (ret)
1224 goto unlock;
1225
1226 ret = wait_for_completion_timeout(&channel->intent_req_comp, 10 * HZ);
1227 if (!ret) {
1228 dev_err(glink->dev, "intent request timed out\n");
1229 ret = -ETIMEDOUT;
1230 } else {
1231 ret = channel->intent_req_result ? 0 : -ECANCELED;
1232 }
1233
1234 unlock:
1235 mutex_unlock(&channel->intent_req_lock);
1236 return ret;
1237 }
1238
1239 static int __qcom_glink_send(struct glink_channel *channel,
1240 void *data, int len, bool wait)
1241 {
1242 struct qcom_glink *glink = channel->glink;
1243 struct glink_core_rx_intent *intent = NULL;
1244 struct glink_core_rx_intent *tmp;
1245 int iid = 0;
1246 struct {
1247 struct glink_msg msg;
1248 __le32 chunk_size;
1249 __le32 left_size;
1250 } __packed req;
1251 int ret;
1252 unsigned long flags;
1253
1254 if (!glink->intentless) {
1255 while (!intent) {
1256 spin_lock_irqsave(&channel->intent_lock, flags);
1257 idr_for_each_entry(&channel->riids, tmp, iid) {
1258 if (tmp->size >= len && !tmp->in_use) {
1259 if (!intent)
1260 intent = tmp;
1261 else if (intent->size > tmp->size)
1262 intent = tmp;
1263 if (intent->size == len)
1264 break;
1265 }
1266 }
1267 if (intent)
1268 intent->in_use = true;
1269 spin_unlock_irqrestore(&channel->intent_lock, flags);
1270
1271 /* We found an available intent */
1272 if (intent)
1273 break;
1274
1275 if (!wait)
1276 return -EBUSY;
1277
1278 ret = qcom_glink_request_intent(glink, channel, len);
1279 if (ret < 0)
1280 return ret;
1281 }
1282
1283 iid = intent->id;
1284 }
1285
1286 req.msg.cmd = cpu_to_le16(RPM_CMD_TX_DATA);
1287 req.msg.param1 = cpu_to_le16(channel->lcid);
1288 req.msg.param2 = cpu_to_le32(iid);
1289 req.chunk_size = cpu_to_le32(len);
1290 req.left_size = cpu_to_le32(0);
1291
1292 ret = qcom_glink_tx(glink, &req, sizeof(req), data, len, wait);
1293
1294 /* Mark intent available if we failed */
1295 if (ret && intent)
1296 intent->in_use = false;
1297
1298 return ret;
1299 }
1300
1301 static int qcom_glink_send(struct rpmsg_endpoint *ept, void *data, int len)
1302 {
1303 struct glink_channel *channel = to_glink_channel(ept);
1304
1305 return __qcom_glink_send(channel, data, len, true);
1306 }
1307
1308 static int qcom_glink_trysend(struct rpmsg_endpoint *ept, void *data, int len)
1309 {
1310 struct glink_channel *channel = to_glink_channel(ept);
1311
1312 return __qcom_glink_send(channel, data, len, false);
1313 }
1314
1315 /*
1316 * Finds the device_node for the glink child interested in this channel.
1317 */
1318 static struct device_node *qcom_glink_match_channel(struct device_node *node,
1319 const char *channel)
1320 {
1321 struct device_node *child;
1322 const char *name;
1323 const char *key;
1324 int ret;
1325
1326 for_each_available_child_of_node(node, child) {
1327 key = "qcom,glink-channels";
1328 ret = of_property_read_string(child, key, &name);
1329 if (ret)
1330 continue;
1331
1332 if (strcmp(name, channel) == 0)
1333 return child;
1334 }
1335
1336 return NULL;
1337 }
1338
1339 static const struct rpmsg_device_ops glink_device_ops = {
1340 .create_ept = qcom_glink_create_ept,
1341 .announce_create = qcom_glink_announce_create,
1342 };
1343
1344 static const struct rpmsg_endpoint_ops glink_endpoint_ops = {
1345 .destroy_ept = qcom_glink_destroy_ept,
1346 .send = qcom_glink_send,
1347 .trysend = qcom_glink_trysend,
1348 };
1349
1350 static void qcom_glink_rpdev_release(struct device *dev)
1351 {
1352 struct rpmsg_device *rpdev = to_rpmsg_device(dev);
1353 struct glink_channel *channel = to_glink_channel(rpdev->ept);
1354
1355 channel->rpdev = NULL;
1356 kfree(rpdev);
1357 }
1358
1359 static int qcom_glink_rx_open(struct qcom_glink *glink, unsigned int rcid,
1360 char *name)
1361 {
1362 struct glink_channel *channel;
1363 struct rpmsg_device *rpdev;
1364 bool create_device = false;
1365 struct device_node *node;
1366 int lcid;
1367 int ret;
1368 unsigned long flags;
1369
1370 spin_lock_irqsave(&glink->idr_lock, flags);
1371 idr_for_each_entry(&glink->lcids, channel, lcid) {
1372 if (!strcmp(channel->name, name))
1373 break;
1374 }
1375 spin_unlock_irqrestore(&glink->idr_lock, flags);
1376
1377 if (!channel) {
1378 channel = qcom_glink_alloc_channel(glink, name);
1379 if (IS_ERR(channel))
1380 return PTR_ERR(channel);
1381
1382 /* The opening dance was initiated by the remote */
1383 create_device = true;
1384 }
1385
1386 spin_lock_irqsave(&glink->idr_lock, flags);
1387 ret = idr_alloc(&glink->rcids, channel, rcid, rcid + 1, GFP_ATOMIC);
1388 if (ret < 0) {
1389 dev_err(glink->dev, "Unable to insert channel into rcid list\n");
1390 spin_unlock_irqrestore(&glink->idr_lock, flags);
1391 goto free_channel;
1392 }
1393 channel->rcid = ret;
1394 spin_unlock_irqrestore(&glink->idr_lock, flags);
1395
1396 complete(&channel->open_req);
1397
1398 if (create_device) {
1399 rpdev = kzalloc(sizeof(*rpdev), GFP_KERNEL);
1400 if (!rpdev) {
1401 ret = -ENOMEM;
1402 goto rcid_remove;
1403 }
1404
1405 rpdev->ept = &channel->ept;
1406 strncpy(rpdev->id.name, name, RPMSG_NAME_SIZE);
1407 rpdev->src = RPMSG_ADDR_ANY;
1408 rpdev->dst = RPMSG_ADDR_ANY;
1409 rpdev->ops = &glink_device_ops;
1410
1411 node = qcom_glink_match_channel(glink->dev->of_node, name);
1412 rpdev->dev.of_node = node;
1413 rpdev->dev.parent = glink->dev;
1414 rpdev->dev.release = qcom_glink_rpdev_release;
1415
1416 ret = rpmsg_register_device(rpdev);
1417 if (ret)
1418 goto free_rpdev;
1419
1420 channel->rpdev = rpdev;
1421 }
1422
1423 return 0;
1424
1425 free_rpdev:
1426 kfree(rpdev);
1427 rcid_remove:
1428 spin_lock_irqsave(&glink->idr_lock, flags);
1429 idr_remove(&glink->rcids, channel->rcid);
1430 channel->rcid = 0;
1431 spin_unlock_irqrestore(&glink->idr_lock, flags);
1432 free_channel:
1433 /* Release the reference, iff we took it */
1434 if (create_device)
1435 kref_put(&channel->refcount, qcom_glink_channel_release);
1436
1437 return ret;
1438 }
1439
1440 static void qcom_glink_rx_close(struct qcom_glink *glink, unsigned int rcid)
1441 {
1442 struct rpmsg_channel_info chinfo;
1443 struct glink_channel *channel;
1444 unsigned long flags;
1445
1446 spin_lock_irqsave(&glink->idr_lock, flags);
1447 channel = idr_find(&glink->rcids, rcid);
1448 spin_unlock_irqrestore(&glink->idr_lock, flags);
1449 if (WARN(!channel, "close request on unknown channel\n"))
1450 return;
1451
1452 /* cancel pending rx_done work */
1453 cancel_work_sync(&channel->intent_work);
1454
1455 if (channel->rpdev) {
1456 strncpy(chinfo.name, channel->name, sizeof(chinfo.name));
1457 chinfo.src = RPMSG_ADDR_ANY;
1458 chinfo.dst = RPMSG_ADDR_ANY;
1459
1460 rpmsg_unregister_device(glink->dev, &chinfo);
1461 }
1462
1463 qcom_glink_send_close_ack(glink, channel->rcid);
1464
1465 spin_lock_irqsave(&glink->idr_lock, flags);
1466 idr_remove(&glink->rcids, channel->rcid);
1467 channel->rcid = 0;
1468 spin_unlock_irqrestore(&glink->idr_lock, flags);
1469
1470 kref_put(&channel->refcount, qcom_glink_channel_release);
1471 }
1472
1473 static void qcom_glink_rx_close_ack(struct qcom_glink *glink, unsigned int lcid)
1474 {
1475 struct glink_channel *channel;
1476 unsigned long flags;
1477
1478 spin_lock_irqsave(&glink->idr_lock, flags);
1479 channel = idr_find(&glink->lcids, lcid);
1480 if (WARN(!channel, "close ack on unknown channel\n")) {
1481 spin_unlock_irqrestore(&glink->idr_lock, flags);
1482 return;
1483 }
1484
1485 idr_remove(&glink->lcids, channel->lcid);
1486 channel->lcid = 0;
1487 spin_unlock_irqrestore(&glink->idr_lock, flags);
1488
1489 kref_put(&channel->refcount, qcom_glink_channel_release);
1490 }
1491
1492 static void qcom_glink_work(struct work_struct *work)
1493 {
1494 struct qcom_glink *glink = container_of(work, struct qcom_glink,
1495 rx_work);
1496 struct glink_defer_cmd *dcmd;
1497 struct glink_msg *msg;
1498 unsigned long flags;
1499 unsigned int param1;
1500 unsigned int param2;
1501 unsigned int cmd;
1502
1503 for (;;) {
1504 spin_lock_irqsave(&glink->rx_lock, flags);
1505 if (list_empty(&glink->rx_queue)) {
1506 spin_unlock_irqrestore(&glink->rx_lock, flags);
1507 break;
1508 }
1509 dcmd = list_first_entry(&glink->rx_queue,
1510 struct glink_defer_cmd, node);
1511 list_del(&dcmd->node);
1512 spin_unlock_irqrestore(&glink->rx_lock, flags);
1513
1514 msg = &dcmd->msg;
1515 cmd = le16_to_cpu(msg->cmd);
1516 param1 = le16_to_cpu(msg->param1);
1517 param2 = le32_to_cpu(msg->param2);
1518
1519 switch (cmd) {
1520 case RPM_CMD_VERSION:
1521 qcom_glink_receive_version(glink, param1, param2);
1522 break;
1523 case RPM_CMD_VERSION_ACK:
1524 qcom_glink_receive_version_ack(glink, param1, param2);
1525 break;
1526 case RPM_CMD_OPEN:
1527 qcom_glink_rx_open(glink, param1, msg->data);
1528 break;
1529 case RPM_CMD_CLOSE:
1530 qcom_glink_rx_close(glink, param1);
1531 break;
1532 case RPM_CMD_CLOSE_ACK:
1533 qcom_glink_rx_close_ack(glink, param1);
1534 break;
1535 case RPM_CMD_RX_INTENT_REQ:
1536 qcom_glink_handle_intent_req(glink, param1, param2);
1537 break;
1538 default:
1539 WARN(1, "Unknown defer object %d\n", cmd);
1540 break;
1541 }
1542
1543 kfree(dcmd);
1544 }
1545 }
1546
1547 struct qcom_glink *qcom_glink_native_probe(struct device *dev,
1548 unsigned long features,
1549 struct qcom_glink_pipe *rx,
1550 struct qcom_glink_pipe *tx,
1551 bool intentless)
1552 {
1553 int irq;
1554 int ret;
1555 struct qcom_glink *glink;
1556
1557 glink = devm_kzalloc(dev, sizeof(*glink), GFP_KERNEL);
1558 if (!glink)
1559 return ERR_PTR(-ENOMEM);
1560
1561 glink->dev = dev;
1562 glink->tx_pipe = tx;
1563 glink->rx_pipe = rx;
1564
1565 glink->features = features;
1566 glink->intentless = intentless;
1567
1568 spin_lock_init(&glink->tx_lock);
1569 spin_lock_init(&glink->rx_lock);
1570 INIT_LIST_HEAD(&glink->rx_queue);
1571 INIT_WORK(&glink->rx_work, qcom_glink_work);
1572
1573 spin_lock_init(&glink->idr_lock);
1574 idr_init(&glink->lcids);
1575 idr_init(&glink->rcids);
1576
1577 ret = of_property_read_string(dev->of_node, "label", &glink->name);
1578 if (ret < 0)
1579 glink->name = dev->of_node->name;
1580
1581 glink->mbox_client.dev = dev;
1582 glink->mbox_client.knows_txdone = true;
1583 glink->mbox_chan = mbox_request_channel(&glink->mbox_client, 0);
1584 if (IS_ERR(glink->mbox_chan)) {
1585 if (PTR_ERR(glink->mbox_chan) != -EPROBE_DEFER)
1586 dev_err(dev, "failed to acquire IPC channel\n");
1587 return ERR_CAST(glink->mbox_chan);
1588 }
1589
1590 irq = of_irq_get(dev->of_node, 0);
1591 ret = devm_request_irq(dev, irq,
1592 qcom_glink_native_intr,
1593 IRQF_NO_SUSPEND | IRQF_SHARED,
1594 "glink-native", glink);
1595 if (ret) {
1596 dev_err(dev, "failed to request IRQ\n");
1597 return ERR_PTR(ret);
1598 }
1599
1600 glink->irq = irq;
1601
1602 ret = qcom_glink_send_version(glink);
1603 if (ret)
1604 return ERR_PTR(ret);
1605
1606 return glink;
1607 }
1608 EXPORT_SYMBOL_GPL(qcom_glink_native_probe);
1609
1610 static int qcom_glink_remove_device(struct device *dev, void *data)
1611 {
1612 device_unregister(dev);
1613
1614 return 0;
1615 }
1616
1617 void qcom_glink_native_remove(struct qcom_glink *glink)
1618 {
1619 struct glink_channel *channel;
1620 int cid;
1621 int ret;
1622 unsigned long flags;
1623
1624 disable_irq(glink->irq);
1625 cancel_work_sync(&glink->rx_work);
1626
1627 ret = device_for_each_child(glink->dev, NULL, qcom_glink_remove_device);
1628 if (ret)
1629 dev_warn(glink->dev, "Can't remove GLINK devices: %d\n", ret);
1630
1631 spin_lock_irqsave(&glink->idr_lock, flags);
1632 /* Release any defunct local channels, waiting for close-ack */
1633 idr_for_each_entry(&glink->lcids, channel, cid)
1634 kref_put(&channel->refcount, qcom_glink_channel_release);
1635
1636 idr_destroy(&glink->lcids);
1637 idr_destroy(&glink->rcids);
1638 spin_unlock_irqrestore(&glink->idr_lock, flags);
1639 mbox_free_channel(glink->mbox_chan);
1640 }
1641 EXPORT_SYMBOL_GPL(qcom_glink_native_remove);
1642
1643 void qcom_glink_native_unregister(struct qcom_glink *glink)
1644 {
1645 device_unregister(glink->dev);
1646 }
1647 EXPORT_SYMBOL_GPL(qcom_glink_native_unregister);
1648
1649 MODULE_DESCRIPTION("Qualcomm GLINK driver");
1650 MODULE_LICENSE("GPL v2");
Linux with added FPC-III support