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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
32struct glink_msg {
33 __le16 cmd;
34 __le16 param1;
35 __le32 param2;
36 u8 data[];
37} __packed;
38
39
40
41
42
43
44
45
46
47
48struct glink_defer_cmd {
49 struct list_head node;
50
51 struct glink_msg msg;
52 u8 data[];
53};
54
55
56
57
58
59
60
61
62
63
64
65
66
67struct 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
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94
95
96struct 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
123enum {
124 GLINK_STATE_CLOSED,
125 GLINK_STATE_OPENING,
126 GLINK_STATE_OPEN,
127 GLINK_STATE_CLOSING,
128};
129
130
131
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152
153
154struct 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
188static 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
207static void qcom_glink_rx_done_work(struct work_struct *work);
208
209static 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
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
240static void qcom_glink_channel_release(struct kref *ref)
241{
242 struct glink_channel *channel = container_of(ref, struct glink_channel,
243 refcount);
244 struct glink_core_rx_intent *intent;
245 struct glink_core_rx_intent *tmp;
246 unsigned long flags;
247 int iid;
248
249
250 cancel_work_sync(&channel->intent_work);
251
252 spin_lock_irqsave(&channel->intent_lock, flags);
253
254 list_for_each_entry_safe(intent, tmp, &channel->done_intents, node) {
255 if (!intent->reuse) {
256 kfree(intent->data);
257 kfree(intent);
258 }
259 }
260
261 idr_for_each_entry(&channel->liids, tmp, iid) {
262 kfree(tmp->data);
263 kfree(tmp);
264 }
265 idr_destroy(&channel->liids);
266
267 idr_for_each_entry(&channel->riids, tmp, iid)
268 kfree(tmp);
269 idr_destroy(&channel->riids);
270 spin_unlock_irqrestore(&channel->intent_lock, flags);
271
272 kfree(channel->name);
273 kfree(channel);
274}
275
276static size_t qcom_glink_rx_avail(struct qcom_glink *glink)
277{
278 return glink->rx_pipe->avail(glink->rx_pipe);
279}
280
281static void qcom_glink_rx_peak(struct qcom_glink *glink,
282 void *data, unsigned int offset, size_t count)
283{
284 glink->rx_pipe->peak(glink->rx_pipe, data, offset, count);
285}
286
287static void qcom_glink_rx_advance(struct qcom_glink *glink, size_t count)
288{
289 glink->rx_pipe->advance(glink->rx_pipe, count);
290}
291
292static size_t qcom_glink_tx_avail(struct qcom_glink *glink)
293{
294 return glink->tx_pipe->avail(glink->tx_pipe);
295}
296
297static void qcom_glink_tx_write(struct qcom_glink *glink,
298 const void *hdr, size_t hlen,
299 const void *data, size_t dlen)
300{
301 glink->tx_pipe->write(glink->tx_pipe, hdr, hlen, data, dlen);
302}
303
304static int qcom_glink_tx(struct qcom_glink *glink,
305 const void *hdr, size_t hlen,
306 const void *data, size_t dlen, bool wait)
307{
308 unsigned int tlen = hlen + dlen;
309 unsigned long flags;
310 int ret = 0;
311
312
313 if (tlen >= glink->tx_pipe->length)
314 return -EINVAL;
315
316 spin_lock_irqsave(&glink->tx_lock, flags);
317
318 while (qcom_glink_tx_avail(glink) < tlen) {
319 if (!wait) {
320 ret = -EAGAIN;
321 goto out;
322 }
323
324
325 spin_unlock_irqrestore(&glink->tx_lock, flags);
326
327 usleep_range(10000, 15000);
328
329 spin_lock_irqsave(&glink->tx_lock, flags);
330 }
331
332 qcom_glink_tx_write(glink, hdr, hlen, data, dlen);
333
334 mbox_send_message(glink->mbox_chan, NULL);
335 mbox_client_txdone(glink->mbox_chan, 0);
336
337out:
338 spin_unlock_irqrestore(&glink->tx_lock, flags);
339
340 return ret;
341}
342
343static int qcom_glink_send_version(struct qcom_glink *glink)
344{
345 struct glink_msg msg;
346
347 msg.cmd = cpu_to_le16(RPM_CMD_VERSION);
348 msg.param1 = cpu_to_le16(GLINK_VERSION_1);
349 msg.param2 = cpu_to_le32(glink->features);
350
351 return qcom_glink_tx(glink, &msg, sizeof(msg), NULL, 0, true);
352}
353
354static void qcom_glink_send_version_ack(struct qcom_glink *glink)
355{
356 struct glink_msg msg;
357
358 msg.cmd = cpu_to_le16(RPM_CMD_VERSION_ACK);
359 msg.param1 = cpu_to_le16(GLINK_VERSION_1);
360 msg.param2 = cpu_to_le32(glink->features);
361
362 qcom_glink_tx(glink, &msg, sizeof(msg), NULL, 0, true);
363}
364
365static void qcom_glink_send_open_ack(struct qcom_glink *glink,
366 struct glink_channel *channel)
367{
368 struct glink_msg msg;
369
370 msg.cmd = cpu_to_le16(RPM_CMD_OPEN_ACK);
371 msg.param1 = cpu_to_le16(channel->rcid);
372 msg.param2 = cpu_to_le32(0);
373
374 qcom_glink_tx(glink, &msg, sizeof(msg), NULL, 0, true);
375}
376
377static void qcom_glink_handle_intent_req_ack(struct qcom_glink *glink,
378 unsigned int cid, bool granted)
379{
380 struct glink_channel *channel;
381 unsigned long flags;
382
383 spin_lock_irqsave(&glink->idr_lock, flags);
384 channel = idr_find(&glink->rcids, cid);
385 spin_unlock_irqrestore(&glink->idr_lock, flags);
386 if (!channel) {
387 dev_err(glink->dev, "unable to find channel\n");
388 return;
389 }
390
391 channel->intent_req_result = granted;
392 complete(&channel->intent_req_comp);
393}
394
395
396
397
398
399
400
401
402
403
404
405static int qcom_glink_send_open_req(struct qcom_glink *glink,
406 struct glink_channel *channel)
407{
408 struct {
409 struct glink_msg msg;
410 u8 name[GLINK_NAME_SIZE];
411 } __packed req;
412 int name_len = strlen(channel->name) + 1;
413 int req_len = ALIGN(sizeof(req.msg) + name_len, 8);
414 int ret;
415 unsigned long flags;
416
417 kref_get(&channel->refcount);
418
419 spin_lock_irqsave(&glink->idr_lock, flags);
420 ret = idr_alloc_cyclic(&glink->lcids, channel,
421 RPM_GLINK_CID_MIN, RPM_GLINK_CID_MAX,
422 GFP_ATOMIC);
423 spin_unlock_irqrestore(&glink->idr_lock, flags);
424 if (ret < 0)
425 return ret;
426
427 channel->lcid = ret;
428
429 req.msg.cmd = cpu_to_le16(RPM_CMD_OPEN);
430 req.msg.param1 = cpu_to_le16(channel->lcid);
431 req.msg.param2 = cpu_to_le32(name_len);
432 strcpy(req.name, channel->name);
433
434 ret = qcom_glink_tx(glink, &req, req_len, NULL, 0, true);
435 if (ret)
436 goto remove_idr;
437
438 return 0;
439
440remove_idr:
441 spin_lock_irqsave(&glink->idr_lock, flags);
442 idr_remove(&glink->lcids, channel->lcid);
443 channel->lcid = 0;
444 spin_unlock_irqrestore(&glink->idr_lock, flags);
445
446 return ret;
447}
448
449static void qcom_glink_send_close_req(struct qcom_glink *glink,
450 struct glink_channel *channel)
451{
452 struct glink_msg req;
453
454 req.cmd = cpu_to_le16(RPM_CMD_CLOSE);
455 req.param1 = cpu_to_le16(channel->lcid);
456 req.param2 = 0;
457
458 qcom_glink_tx(glink, &req, sizeof(req), NULL, 0, true);
459}
460
461static void qcom_glink_send_close_ack(struct qcom_glink *glink,
462 unsigned int rcid)
463{
464 struct glink_msg req;
465
466 req.cmd = cpu_to_le16(RPM_CMD_CLOSE_ACK);
467 req.param1 = cpu_to_le16(rcid);
468 req.param2 = 0;
469
470 qcom_glink_tx(glink, &req, sizeof(req), NULL, 0, true);
471}
472
473static void qcom_glink_rx_done_work(struct work_struct *work)
474{
475 struct glink_channel *channel = container_of(work, struct glink_channel,
476 intent_work);
477 struct qcom_glink *glink = channel->glink;
478 struct glink_core_rx_intent *intent, *tmp;
479 struct {
480 u16 id;
481 u16 lcid;
482 u32 liid;
483 } __packed cmd;
484
485 unsigned int cid = channel->lcid;
486 unsigned int iid;
487 bool reuse;
488 unsigned long flags;
489
490 spin_lock_irqsave(&channel->intent_lock, flags);
491 list_for_each_entry_safe(intent, tmp, &channel->done_intents, node) {
492 list_del(&intent->node);
493 spin_unlock_irqrestore(&channel->intent_lock, flags);
494 iid = intent->id;
495 reuse = intent->reuse;
496
497 cmd.id = reuse ? RPM_CMD_RX_DONE_W_REUSE : RPM_CMD_RX_DONE;
498 cmd.lcid = cid;
499 cmd.liid = iid;
500
501 qcom_glink_tx(glink, &cmd, sizeof(cmd), NULL, 0, true);
502 if (!reuse) {
503 kfree(intent->data);
504 kfree(intent);
505 }
506 spin_lock_irqsave(&channel->intent_lock, flags);
507 }
508 spin_unlock_irqrestore(&channel->intent_lock, flags);
509}
510
511static void qcom_glink_rx_done(struct qcom_glink *glink,
512 struct glink_channel *channel,
513 struct glink_core_rx_intent *intent)
514{
515
516 if (glink->intentless) {
517 kfree(intent->data);
518 kfree(intent);
519 return;
520 }
521
522
523 if (!intent->reuse) {
524 spin_lock(&channel->intent_lock);
525 idr_remove(&channel->liids, intent->id);
526 spin_unlock(&channel->intent_lock);
527 }
528
529
530 spin_lock(&channel->intent_lock);
531 list_add_tail(&intent->node, &channel->done_intents);
532 spin_unlock(&channel->intent_lock);
533
534 schedule_work(&channel->intent_work);
535}
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545
546
547static void qcom_glink_receive_version(struct qcom_glink *glink,
548 u32 version,
549 u32 features)
550{
551 switch (version) {
552 case 0:
553 break;
554 case GLINK_VERSION_1:
555 glink->features &= features;
556 fallthrough;
557 default:
558 qcom_glink_send_version_ack(glink);
559 break;
560 }
561}
562
563
564
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566
567
568
569
570
571
572
573
574static void qcom_glink_receive_version_ack(struct qcom_glink *glink,
575 u32 version,
576 u32 features)
577{
578 switch (version) {
579 case 0:
580
581 break;
582 case GLINK_VERSION_1:
583 if (features == glink->features)
584 break;
585
586 glink->features &= features;
587 fallthrough;
588 default:
589 qcom_glink_send_version(glink);
590 break;
591 }
592}
593
594
595
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597
598
599
600
601
602
603static int qcom_glink_send_intent_req_ack(struct qcom_glink *glink,
604 struct glink_channel *channel,
605 bool granted)
606{
607 struct glink_msg msg;
608
609 msg.cmd = cpu_to_le16(RPM_CMD_RX_INTENT_REQ_ACK);
610 msg.param1 = cpu_to_le16(channel->lcid);
611 msg.param2 = cpu_to_le32(granted);
612
613 qcom_glink_tx(glink, &msg, sizeof(msg), NULL, 0, true);
614
615 return 0;
616}
617
618
619
620
621
622
623
624
625
626
627static int qcom_glink_advertise_intent(struct qcom_glink *glink,
628 struct glink_channel *channel,
629 struct glink_core_rx_intent *intent)
630{
631 struct command {
632 __le16 id;
633 __le16 lcid;
634 __le32 count;
635 __le32 size;
636 __le32 liid;
637 } __packed;
638 struct command cmd;
639
640 cmd.id = cpu_to_le16(RPM_CMD_INTENT);
641 cmd.lcid = cpu_to_le16(channel->lcid);
642 cmd.count = cpu_to_le32(1);
643 cmd.size = cpu_to_le32(intent->size);
644 cmd.liid = cpu_to_le32(intent->id);
645
646 qcom_glink_tx(glink, &cmd, sizeof(cmd), NULL, 0, true);
647
648 return 0;
649}
650
651static struct glink_core_rx_intent *
652qcom_glink_alloc_intent(struct qcom_glink *glink,
653 struct glink_channel *channel,
654 size_t size,
655 bool reuseable)
656{
657 struct glink_core_rx_intent *intent;
658 int ret;
659 unsigned long flags;
660
661 intent = kzalloc(sizeof(*intent), GFP_KERNEL);
662 if (!intent)
663 return NULL;
664
665 intent->data = kzalloc(size, GFP_KERNEL);
666 if (!intent->data)
667 goto free_intent;
668
669 spin_lock_irqsave(&channel->intent_lock, flags);
670 ret = idr_alloc_cyclic(&channel->liids, intent, 1, -1, GFP_ATOMIC);
671 if (ret < 0) {
672 spin_unlock_irqrestore(&channel->intent_lock, flags);
673 goto free_data;
674 }
675 spin_unlock_irqrestore(&channel->intent_lock, flags);
676
677 intent->id = ret;
678 intent->size = size;
679 intent->reuse = reuseable;
680
681 return intent;
682
683free_data:
684 kfree(intent->data);
685free_intent:
686 kfree(intent);
687 return NULL;
688}
689
690static void qcom_glink_handle_rx_done(struct qcom_glink *glink,
691 u32 cid, uint32_t iid,
692 bool reuse)
693{
694 struct glink_core_rx_intent *intent;
695 struct glink_channel *channel;
696 unsigned long flags;
697
698 spin_lock_irqsave(&glink->idr_lock, flags);
699 channel = idr_find(&glink->rcids, cid);
700 spin_unlock_irqrestore(&glink->idr_lock, flags);
701 if (!channel) {
702 dev_err(glink->dev, "invalid channel id received\n");
703 return;
704 }
705
706 spin_lock_irqsave(&channel->intent_lock, flags);
707 intent = idr_find(&channel->riids, iid);
708
709 if (!intent) {
710 spin_unlock_irqrestore(&channel->intent_lock, flags);
711 dev_err(glink->dev, "invalid intent id received\n");
712 return;
713 }
714
715 intent->in_use = false;
716
717 if (!reuse) {
718 idr_remove(&channel->riids, intent->id);
719 kfree(intent);
720 }
721 spin_unlock_irqrestore(&channel->intent_lock, flags);
722}
723
724
725
726
727
728
729
730
731
732
733
734static void qcom_glink_handle_intent_req(struct qcom_glink *glink,
735 u32 cid, size_t size)
736{
737 struct glink_core_rx_intent *intent;
738 struct glink_channel *channel;
739 unsigned long flags;
740
741 spin_lock_irqsave(&glink->idr_lock, flags);
742 channel = idr_find(&glink->rcids, cid);
743 spin_unlock_irqrestore(&glink->idr_lock, flags);
744
745 if (!channel) {
746 pr_err("%s channel not found for cid %d\n", __func__, cid);
747 return;
748 }
749
750 intent = qcom_glink_alloc_intent(glink, channel, size, false);
751 if (intent)
752 qcom_glink_advertise_intent(glink, channel, intent);
753
754 qcom_glink_send_intent_req_ack(glink, channel, !!intent);
755}
756
757static int qcom_glink_rx_defer(struct qcom_glink *glink, size_t extra)
758{
759 struct glink_defer_cmd *dcmd;
760
761 extra = ALIGN(extra, 8);
762
763 if (qcom_glink_rx_avail(glink) < sizeof(struct glink_msg) + extra) {
764 dev_dbg(glink->dev, "Insufficient data in rx fifo");
765 return -ENXIO;
766 }
767
768 dcmd = kzalloc(sizeof(*dcmd) + extra, GFP_ATOMIC);
769 if (!dcmd)
770 return -ENOMEM;
771
772 INIT_LIST_HEAD(&dcmd->node);
773
774 qcom_glink_rx_peak(glink, &dcmd->msg, 0, sizeof(dcmd->msg) + extra);
775
776 spin_lock(&glink->rx_lock);
777 list_add_tail(&dcmd->node, &glink->rx_queue);
778 spin_unlock(&glink->rx_lock);
779
780 schedule_work(&glink->rx_work);
781 qcom_glink_rx_advance(glink, sizeof(dcmd->msg) + extra);
782
783 return 0;
784}
785
786static int qcom_glink_rx_data(struct qcom_glink *glink, size_t avail)
787{
788 struct glink_core_rx_intent *intent;
789 struct glink_channel *channel;
790 struct {
791 struct glink_msg msg;
792 __le32 chunk_size;
793 __le32 left_size;
794 } __packed hdr;
795 unsigned int chunk_size;
796 unsigned int left_size;
797 unsigned int rcid;
798 unsigned int liid;
799 int ret = 0;
800 unsigned long flags;
801
802 if (avail < sizeof(hdr)) {
803 dev_dbg(glink->dev, "Not enough data in fifo\n");
804 return -EAGAIN;
805 }
806
807 qcom_glink_rx_peak(glink, &hdr, 0, sizeof(hdr));
808 chunk_size = le32_to_cpu(hdr.chunk_size);
809 left_size = le32_to_cpu(hdr.left_size);
810
811 if (avail < sizeof(hdr) + chunk_size) {
812 dev_dbg(glink->dev, "Payload not yet in fifo\n");
813 return -EAGAIN;
814 }
815
816 rcid = le16_to_cpu(hdr.msg.param1);
817 spin_lock_irqsave(&glink->idr_lock, flags);
818 channel = idr_find(&glink->rcids, rcid);
819 spin_unlock_irqrestore(&glink->idr_lock, flags);
820 if (!channel) {
821 dev_dbg(glink->dev, "Data on non-existing channel\n");
822
823
824 goto advance_rx;
825 }
826
827 if (glink->intentless) {
828
829 if (!channel->buf) {
830 intent = kzalloc(sizeof(*intent), GFP_ATOMIC);
831 if (!intent)
832 return -ENOMEM;
833
834 intent->data = kmalloc(chunk_size + left_size,
835 GFP_ATOMIC);
836 if (!intent->data) {
837 kfree(intent);
838 return -ENOMEM;
839 }
840
841 intent->id = 0xbabababa;
842 intent->size = chunk_size + left_size;
843 intent->offset = 0;
844
845 channel->buf = intent;
846 } else {
847 intent = channel->buf;
848 }
849 } else {
850 liid = le32_to_cpu(hdr.msg.param2);
851
852 spin_lock_irqsave(&channel->intent_lock, flags);
853 intent = idr_find(&channel->liids, liid);
854 spin_unlock_irqrestore(&channel->intent_lock, flags);
855
856 if (!intent) {
857 dev_err(glink->dev,
858 "no intent found for channel %s intent %d",
859 channel->name, liid);
860 ret = -ENOENT;
861 goto advance_rx;
862 }
863 }
864
865 if (intent->size - intent->offset < chunk_size) {
866 dev_err(glink->dev, "Insufficient space in intent\n");
867
868
869 goto advance_rx;
870 }
871
872 qcom_glink_rx_peak(glink, intent->data + intent->offset,
873 sizeof(hdr), chunk_size);
874 intent->offset += chunk_size;
875
876
877 if (!left_size) {
878 spin_lock(&channel->recv_lock);
879 if (channel->ept.cb) {
880 channel->ept.cb(channel->ept.rpdev,
881 intent->data,
882 intent->offset,
883 channel->ept.priv,
884 RPMSG_ADDR_ANY);
885 }
886 spin_unlock(&channel->recv_lock);
887
888 intent->offset = 0;
889 channel->buf = NULL;
890
891 qcom_glink_rx_done(glink, channel, intent);
892 }
893
894advance_rx:
895 qcom_glink_rx_advance(glink, ALIGN(sizeof(hdr) + chunk_size, 8));
896
897 return ret;
898}
899
900static void qcom_glink_handle_intent(struct qcom_glink *glink,
901 unsigned int cid,
902 unsigned int count,
903 size_t avail)
904{
905 struct glink_core_rx_intent *intent;
906 struct glink_channel *channel;
907 struct intent_pair {
908 __le32 size;
909 __le32 iid;
910 };
911
912 struct {
913 struct glink_msg msg;
914 struct intent_pair intents[];
915 } __packed * msg;
916
917 const size_t msglen = struct_size(msg, intents, count);
918 int ret;
919 int i;
920 unsigned long flags;
921
922 if (avail < msglen) {
923 dev_dbg(glink->dev, "Not enough data in fifo\n");
924 return;
925 }
926
927 spin_lock_irqsave(&glink->idr_lock, flags);
928 channel = idr_find(&glink->rcids, cid);
929 spin_unlock_irqrestore(&glink->idr_lock, flags);
930 if (!channel) {
931 dev_err(glink->dev, "intents for non-existing channel\n");
932 return;
933 }
934
935 msg = kmalloc(msglen, GFP_ATOMIC);
936 if (!msg)
937 return;
938
939 qcom_glink_rx_peak(glink, msg, 0, msglen);
940
941 for (i = 0; i < count; ++i) {
942 intent = kzalloc(sizeof(*intent), GFP_ATOMIC);
943 if (!intent)
944 break;
945
946 intent->id = le32_to_cpu(msg->intents[i].iid);
947 intent->size = le32_to_cpu(msg->intents[i].size);
948
949 spin_lock_irqsave(&channel->intent_lock, flags);
950 ret = idr_alloc(&channel->riids, intent,
951 intent->id, intent->id + 1, GFP_ATOMIC);
952 spin_unlock_irqrestore(&channel->intent_lock, flags);
953
954 if (ret < 0)
955 dev_err(glink->dev, "failed to store remote intent\n");
956 }
957
958 kfree(msg);
959 qcom_glink_rx_advance(glink, ALIGN(msglen, 8));
960}
961
962static int qcom_glink_rx_open_ack(struct qcom_glink *glink, unsigned int lcid)
963{
964 struct glink_channel *channel;
965
966 spin_lock(&glink->idr_lock);
967 channel = idr_find(&glink->lcids, lcid);
968 spin_unlock(&glink->idr_lock);
969 if (!channel) {
970 dev_err(glink->dev, "Invalid open ack packet\n");
971 return -EINVAL;
972 }
973
974 complete_all(&channel->open_ack);
975
976 return 0;
977}
978
979static irqreturn_t qcom_glink_native_intr(int irq, void *data)
980{
981 struct qcom_glink *glink = data;
982 struct glink_msg msg;
983 unsigned int param1;
984 unsigned int param2;
985 unsigned int avail;
986 unsigned int cmd;
987 int ret = 0;
988
989 for (;;) {
990 avail = qcom_glink_rx_avail(glink);
991 if (avail < sizeof(msg))
992 break;
993
994 qcom_glink_rx_peak(glink, &msg, 0, sizeof(msg));
995
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 case RPM_CMD_VERSION_ACK:
1003 case RPM_CMD_CLOSE:
1004 case RPM_CMD_CLOSE_ACK:
1005 case RPM_CMD_RX_INTENT_REQ:
1006 ret = qcom_glink_rx_defer(glink, 0);
1007 break;
1008 case RPM_CMD_OPEN_ACK:
1009 ret = qcom_glink_rx_open_ack(glink, param1);
1010 qcom_glink_rx_advance(glink, ALIGN(sizeof(msg), 8));
1011 break;
1012 case RPM_CMD_OPEN:
1013 ret = qcom_glink_rx_defer(glink, param2);
1014 break;
1015 case RPM_CMD_TX_DATA:
1016 case RPM_CMD_TX_DATA_CONT:
1017 ret = qcom_glink_rx_data(glink, avail);
1018 break;
1019 case RPM_CMD_READ_NOTIF:
1020 qcom_glink_rx_advance(glink, ALIGN(sizeof(msg), 8));
1021
1022 mbox_send_message(glink->mbox_chan, NULL);
1023 mbox_client_txdone(glink->mbox_chan, 0);
1024 break;
1025 case RPM_CMD_INTENT:
1026 qcom_glink_handle_intent(glink, param1, param2, avail);
1027 break;
1028 case RPM_CMD_RX_DONE:
1029 qcom_glink_handle_rx_done(glink, param1, param2, false);
1030 qcom_glink_rx_advance(glink, ALIGN(sizeof(msg), 8));
1031 break;
1032 case RPM_CMD_RX_DONE_W_REUSE:
1033 qcom_glink_handle_rx_done(glink, param1, param2, true);
1034 qcom_glink_rx_advance(glink, ALIGN(sizeof(msg), 8));
1035 break;
1036 case RPM_CMD_RX_INTENT_REQ_ACK:
1037 qcom_glink_handle_intent_req_ack(glink, param1, param2);
1038 qcom_glink_rx_advance(glink, ALIGN(sizeof(msg), 8));
1039 break;
1040 default:
1041 dev_err(glink->dev, "unhandled rx cmd: %d\n", cmd);
1042 ret = -EINVAL;
1043 break;
1044 }
1045
1046 if (ret)
1047 break;
1048 }
1049
1050 return IRQ_HANDLED;
1051}
1052
1053
1054static struct glink_channel *qcom_glink_create_local(struct qcom_glink *glink,
1055 const char *name)
1056{
1057 struct glink_channel *channel;
1058 int ret;
1059 unsigned long flags;
1060
1061 channel = qcom_glink_alloc_channel(glink, name);
1062 if (IS_ERR(channel))
1063 return ERR_CAST(channel);
1064
1065 ret = qcom_glink_send_open_req(glink, channel);
1066 if (ret)
1067 goto release_channel;
1068
1069 ret = wait_for_completion_timeout(&channel->open_ack, 5 * HZ);
1070 if (!ret)
1071 goto err_timeout;
1072
1073 ret = wait_for_completion_timeout(&channel->open_req, 5 * HZ);
1074 if (!ret)
1075 goto err_timeout;
1076
1077 qcom_glink_send_open_ack(glink, channel);
1078
1079 return channel;
1080
1081err_timeout:
1082
1083 spin_lock_irqsave(&glink->idr_lock, flags);
1084 idr_remove(&glink->lcids, channel->lcid);
1085 spin_unlock_irqrestore(&glink->idr_lock, flags);
1086
1087release_channel:
1088
1089 kref_put(&channel->refcount, qcom_glink_channel_release);
1090
1091 kref_put(&channel->refcount, qcom_glink_channel_release);
1092
1093 return ERR_PTR(-ETIMEDOUT);
1094}
1095
1096
1097static int qcom_glink_create_remote(struct qcom_glink *glink,
1098 struct glink_channel *channel)
1099{
1100 int ret;
1101
1102 qcom_glink_send_open_ack(glink, channel);
1103
1104 ret = qcom_glink_send_open_req(glink, channel);
1105 if (ret)
1106 goto close_link;
1107
1108 ret = wait_for_completion_timeout(&channel->open_ack, 5 * HZ);
1109 if (!ret) {
1110 ret = -ETIMEDOUT;
1111 goto close_link;
1112 }
1113
1114 return 0;
1115
1116close_link:
1117
1118
1119
1120
1121
1122
1123 qcom_glink_send_close_req(glink, channel);
1124
1125 return ret;
1126}
1127
1128static struct rpmsg_endpoint *qcom_glink_create_ept(struct rpmsg_device *rpdev,
1129 rpmsg_rx_cb_t cb,
1130 void *priv,
1131 struct rpmsg_channel_info
1132 chinfo)
1133{
1134 struct glink_channel *parent = to_glink_channel(rpdev->ept);
1135 struct glink_channel *channel;
1136 struct qcom_glink *glink = parent->glink;
1137 struct rpmsg_endpoint *ept;
1138 const char *name = chinfo.name;
1139 int cid;
1140 int ret;
1141 unsigned long flags;
1142
1143 spin_lock_irqsave(&glink->idr_lock, flags);
1144 idr_for_each_entry(&glink->rcids, channel, cid) {
1145 if (!strcmp(channel->name, name))
1146 break;
1147 }
1148 spin_unlock_irqrestore(&glink->idr_lock, flags);
1149
1150 if (!channel) {
1151 channel = qcom_glink_create_local(glink, name);
1152 if (IS_ERR(channel))
1153 return NULL;
1154 } else {
1155 ret = qcom_glink_create_remote(glink, channel);
1156 if (ret)
1157 return NULL;
1158 }
1159
1160 ept = &channel->ept;
1161 ept->rpdev = rpdev;
1162 ept->cb = cb;
1163 ept->priv = priv;
1164 ept->ops = &glink_endpoint_ops;
1165
1166 return ept;
1167}
1168
1169static int qcom_glink_announce_create(struct rpmsg_device *rpdev)
1170{
1171 struct glink_channel *channel = to_glink_channel(rpdev->ept);
1172 struct device_node *np = rpdev->dev.of_node;
1173 struct qcom_glink *glink = channel->glink;
1174 struct glink_core_rx_intent *intent;
1175 const struct property *prop = NULL;
1176 __be32 defaults[] = { cpu_to_be32(SZ_1K), cpu_to_be32(5) };
1177 int num_intents;
1178 int num_groups = 1;
1179 __be32 *val = defaults;
1180 int size;
1181
1182 if (glink->intentless || !completion_done(&channel->open_ack))
1183 return 0;
1184
1185 prop = of_find_property(np, "qcom,intents", NULL);
1186 if (prop) {
1187 val = prop->value;
1188 num_groups = prop->length / sizeof(u32) / 2;
1189 }
1190
1191
1192 while (num_groups--) {
1193 size = be32_to_cpup(val++);
1194 num_intents = be32_to_cpup(val++);
1195 while (num_intents--) {
1196 intent = qcom_glink_alloc_intent(glink, channel, size,
1197 true);
1198 if (!intent)
1199 break;
1200
1201 qcom_glink_advertise_intent(glink, channel, intent);
1202 }
1203 }
1204 return 0;
1205}
1206
1207static void qcom_glink_destroy_ept(struct rpmsg_endpoint *ept)
1208{
1209 struct glink_channel *channel = to_glink_channel(ept);
1210 struct qcom_glink *glink = channel->glink;
1211 unsigned long flags;
1212
1213 spin_lock_irqsave(&channel->recv_lock, flags);
1214 channel->ept.cb = NULL;
1215 spin_unlock_irqrestore(&channel->recv_lock, flags);
1216
1217
1218 channel->rpdev = NULL;
1219
1220 qcom_glink_send_close_req(glink, channel);
1221}
1222
1223static int qcom_glink_request_intent(struct qcom_glink *glink,
1224 struct glink_channel *channel,
1225 size_t size)
1226{
1227 struct {
1228 u16 id;
1229 u16 cid;
1230 u32 size;
1231 } __packed cmd;
1232
1233 int ret;
1234
1235 mutex_lock(&channel->intent_req_lock);
1236
1237 reinit_completion(&channel->intent_req_comp);
1238
1239 cmd.id = RPM_CMD_RX_INTENT_REQ;
1240 cmd.cid = channel->lcid;
1241 cmd.size = size;
1242
1243 ret = qcom_glink_tx(glink, &cmd, sizeof(cmd), NULL, 0, true);
1244 if (ret)
1245 goto unlock;
1246
1247 ret = wait_for_completion_timeout(&channel->intent_req_comp, 10 * HZ);
1248 if (!ret) {
1249 dev_err(glink->dev, "intent request timed out\n");
1250 ret = -ETIMEDOUT;
1251 } else {
1252 ret = channel->intent_req_result ? 0 : -ECANCELED;
1253 }
1254
1255unlock:
1256 mutex_unlock(&channel->intent_req_lock);
1257 return ret;
1258}
1259
1260static int __qcom_glink_send(struct glink_channel *channel,
1261 void *data, int len, bool wait)
1262{
1263 struct qcom_glink *glink = channel->glink;
1264 struct glink_core_rx_intent *intent = NULL;
1265 struct glink_core_rx_intent *tmp;
1266 int iid = 0;
1267 struct {
1268 struct glink_msg msg;
1269 __le32 chunk_size;
1270 __le32 left_size;
1271 } __packed req;
1272 int ret;
1273 unsigned long flags;
1274
1275 if (!glink->intentless) {
1276 while (!intent) {
1277 spin_lock_irqsave(&channel->intent_lock, flags);
1278 idr_for_each_entry(&channel->riids, tmp, iid) {
1279 if (tmp->size >= len && !tmp->in_use) {
1280 if (!intent)
1281 intent = tmp;
1282 else if (intent->size > tmp->size)
1283 intent = tmp;
1284 if (intent->size == len)
1285 break;
1286 }
1287 }
1288 if (intent)
1289 intent->in_use = true;
1290 spin_unlock_irqrestore(&channel->intent_lock, flags);
1291
1292
1293 if (intent)
1294 break;
1295
1296 if (!wait)
1297 return -EBUSY;
1298
1299 ret = qcom_glink_request_intent(glink, channel, len);
1300 if (ret < 0)
1301 return ret;
1302 }
1303
1304 iid = intent->id;
1305 }
1306
1307 req.msg.cmd = cpu_to_le16(RPM_CMD_TX_DATA);
1308 req.msg.param1 = cpu_to_le16(channel->lcid);
1309 req.msg.param2 = cpu_to_le32(iid);
1310 req.chunk_size = cpu_to_le32(len);
1311 req.left_size = cpu_to_le32(0);
1312
1313 ret = qcom_glink_tx(glink, &req, sizeof(req), data, len, wait);
1314
1315
1316 if (ret && intent)
1317 intent->in_use = false;
1318
1319 return ret;
1320}
1321
1322static int qcom_glink_send(struct rpmsg_endpoint *ept, void *data, int len)
1323{
1324 struct glink_channel *channel = to_glink_channel(ept);
1325
1326 return __qcom_glink_send(channel, data, len, true);
1327}
1328
1329static int qcom_glink_trysend(struct rpmsg_endpoint *ept, void *data, int len)
1330{
1331 struct glink_channel *channel = to_glink_channel(ept);
1332
1333 return __qcom_glink_send(channel, data, len, false);
1334}
1335
1336static int qcom_glink_sendto(struct rpmsg_endpoint *ept, void *data, int len, u32 dst)
1337{
1338 struct glink_channel *channel = to_glink_channel(ept);
1339
1340 return __qcom_glink_send(channel, data, len, true);
1341}
1342
1343static int qcom_glink_trysendto(struct rpmsg_endpoint *ept, void *data, int len, u32 dst)
1344{
1345 struct glink_channel *channel = to_glink_channel(ept);
1346
1347 return __qcom_glink_send(channel, data, len, false);
1348}
1349
1350
1351
1352
1353static struct device_node *qcom_glink_match_channel(struct device_node *node,
1354 const char *channel)
1355{
1356 struct device_node *child;
1357 const char *name;
1358 const char *key;
1359 int ret;
1360
1361 for_each_available_child_of_node(node, child) {
1362 key = "qcom,glink-channels";
1363 ret = of_property_read_string(child, key, &name);
1364 if (ret)
1365 continue;
1366
1367 if (strcmp(name, channel) == 0)
1368 return child;
1369 }
1370
1371 return NULL;
1372}
1373
1374static const struct rpmsg_device_ops glink_device_ops = {
1375 .create_ept = qcom_glink_create_ept,
1376 .announce_create = qcom_glink_announce_create,
1377};
1378
1379static const struct rpmsg_endpoint_ops glink_endpoint_ops = {
1380 .destroy_ept = qcom_glink_destroy_ept,
1381 .send = qcom_glink_send,
1382 .sendto = qcom_glink_sendto,
1383 .trysend = qcom_glink_trysend,
1384 .trysendto = qcom_glink_trysendto,
1385};
1386
1387static void qcom_glink_rpdev_release(struct device *dev)
1388{
1389 struct rpmsg_device *rpdev = to_rpmsg_device(dev);
1390 struct glink_channel *channel = to_glink_channel(rpdev->ept);
1391
1392 channel->rpdev = NULL;
1393 kfree(rpdev);
1394}
1395
1396static int qcom_glink_rx_open(struct qcom_glink *glink, unsigned int rcid,
1397 char *name)
1398{
1399 struct glink_channel *channel;
1400 struct rpmsg_device *rpdev;
1401 bool create_device = false;
1402 struct device_node *node;
1403 int lcid;
1404 int ret;
1405 unsigned long flags;
1406
1407 spin_lock_irqsave(&glink->idr_lock, flags);
1408 idr_for_each_entry(&glink->lcids, channel, lcid) {
1409 if (!strcmp(channel->name, name))
1410 break;
1411 }
1412 spin_unlock_irqrestore(&glink->idr_lock, flags);
1413
1414 if (!channel) {
1415 channel = qcom_glink_alloc_channel(glink, name);
1416 if (IS_ERR(channel))
1417 return PTR_ERR(channel);
1418
1419
1420 create_device = true;
1421 }
1422
1423 spin_lock_irqsave(&glink->idr_lock, flags);
1424 ret = idr_alloc(&glink->rcids, channel, rcid, rcid + 1, GFP_ATOMIC);
1425 if (ret < 0) {
1426 dev_err(glink->dev, "Unable to insert channel into rcid list\n");
1427 spin_unlock_irqrestore(&glink->idr_lock, flags);
1428 goto free_channel;
1429 }
1430 channel->rcid = ret;
1431 spin_unlock_irqrestore(&glink->idr_lock, flags);
1432
1433 complete_all(&channel->open_req);
1434
1435 if (create_device) {
1436 rpdev = kzalloc(sizeof(*rpdev), GFP_KERNEL);
1437 if (!rpdev) {
1438 ret = -ENOMEM;
1439 goto rcid_remove;
1440 }
1441
1442 rpdev->ept = &channel->ept;
1443 strncpy(rpdev->id.name, name, RPMSG_NAME_SIZE);
1444 rpdev->src = RPMSG_ADDR_ANY;
1445 rpdev->dst = RPMSG_ADDR_ANY;
1446 rpdev->ops = &glink_device_ops;
1447
1448 node = qcom_glink_match_channel(glink->dev->of_node, name);
1449 rpdev->dev.of_node = node;
1450 rpdev->dev.parent = glink->dev;
1451 rpdev->dev.release = qcom_glink_rpdev_release;
1452
1453 ret = rpmsg_register_device(rpdev);
1454 if (ret)
1455 goto rcid_remove;
1456
1457 channel->rpdev = rpdev;
1458 }
1459
1460 return 0;
1461
1462rcid_remove:
1463 spin_lock_irqsave(&glink->idr_lock, flags);
1464 idr_remove(&glink->rcids, channel->rcid);
1465 channel->rcid = 0;
1466 spin_unlock_irqrestore(&glink->idr_lock, flags);
1467free_channel:
1468
1469 if (create_device)
1470 kref_put(&channel->refcount, qcom_glink_channel_release);
1471
1472 return ret;
1473}
1474
1475static void qcom_glink_rx_close(struct qcom_glink *glink, unsigned int rcid)
1476{
1477 struct rpmsg_channel_info chinfo;
1478 struct glink_channel *channel;
1479 unsigned long flags;
1480
1481 spin_lock_irqsave(&glink->idr_lock, flags);
1482 channel = idr_find(&glink->rcids, rcid);
1483 spin_unlock_irqrestore(&glink->idr_lock, flags);
1484 if (WARN(!channel, "close request on unknown channel\n"))
1485 return;
1486
1487
1488 cancel_work_sync(&channel->intent_work);
1489
1490 if (channel->rpdev) {
1491 strncpy(chinfo.name, channel->name, sizeof(chinfo.name));
1492 chinfo.src = RPMSG_ADDR_ANY;
1493 chinfo.dst = RPMSG_ADDR_ANY;
1494
1495 rpmsg_unregister_device(glink->dev, &chinfo);
1496 }
1497
1498 qcom_glink_send_close_ack(glink, channel->rcid);
1499
1500 spin_lock_irqsave(&glink->idr_lock, flags);
1501 idr_remove(&glink->rcids, channel->rcid);
1502 channel->rcid = 0;
1503 spin_unlock_irqrestore(&glink->idr_lock, flags);
1504
1505 kref_put(&channel->refcount, qcom_glink_channel_release);
1506}
1507
1508static void qcom_glink_rx_close_ack(struct qcom_glink *glink, unsigned int lcid)
1509{
1510 struct glink_channel *channel;
1511 unsigned long flags;
1512
1513 spin_lock_irqsave(&glink->idr_lock, flags);
1514 channel = idr_find(&glink->lcids, lcid);
1515 if (WARN(!channel, "close ack on unknown channel\n")) {
1516 spin_unlock_irqrestore(&glink->idr_lock, flags);
1517 return;
1518 }
1519
1520 idr_remove(&glink->lcids, channel->lcid);
1521 channel->lcid = 0;
1522 spin_unlock_irqrestore(&glink->idr_lock, flags);
1523
1524 kref_put(&channel->refcount, qcom_glink_channel_release);
1525}
1526
1527static void qcom_glink_work(struct work_struct *work)
1528{
1529 struct qcom_glink *glink = container_of(work, struct qcom_glink,
1530 rx_work);
1531 struct glink_defer_cmd *dcmd;
1532 struct glink_msg *msg;
1533 unsigned long flags;
1534 unsigned int param1;
1535 unsigned int param2;
1536 unsigned int cmd;
1537
1538 for (;;) {
1539 spin_lock_irqsave(&glink->rx_lock, flags);
1540 if (list_empty(&glink->rx_queue)) {
1541 spin_unlock_irqrestore(&glink->rx_lock, flags);
1542 break;
1543 }
1544 dcmd = list_first_entry(&glink->rx_queue,
1545 struct glink_defer_cmd, node);
1546 list_del(&dcmd->node);
1547 spin_unlock_irqrestore(&glink->rx_lock, flags);
1548
1549 msg = &dcmd->msg;
1550 cmd = le16_to_cpu(msg->cmd);
1551 param1 = le16_to_cpu(msg->param1);
1552 param2 = le32_to_cpu(msg->param2);
1553
1554 switch (cmd) {
1555 case RPM_CMD_VERSION:
1556 qcom_glink_receive_version(glink, param1, param2);
1557 break;
1558 case RPM_CMD_VERSION_ACK:
1559 qcom_glink_receive_version_ack(glink, param1, param2);
1560 break;
1561 case RPM_CMD_OPEN:
1562 qcom_glink_rx_open(glink, param1, msg->data);
1563 break;
1564 case RPM_CMD_CLOSE:
1565 qcom_glink_rx_close(glink, param1);
1566 break;
1567 case RPM_CMD_CLOSE_ACK:
1568 qcom_glink_rx_close_ack(glink, param1);
1569 break;
1570 case RPM_CMD_RX_INTENT_REQ:
1571 qcom_glink_handle_intent_req(glink, param1, param2);
1572 break;
1573 default:
1574 WARN(1, "Unknown defer object %d\n", cmd);
1575 break;
1576 }
1577
1578 kfree(dcmd);
1579 }
1580}
1581
1582static void qcom_glink_cancel_rx_work(struct qcom_glink *glink)
1583{
1584 struct glink_defer_cmd *dcmd;
1585 struct glink_defer_cmd *tmp;
1586
1587
1588 cancel_work_sync(&glink->rx_work);
1589
1590 list_for_each_entry_safe(dcmd, tmp, &glink->rx_queue, node)
1591 kfree(dcmd);
1592}
1593
1594static ssize_t rpmsg_name_show(struct device *dev,
1595 struct device_attribute *attr, char *buf)
1596{
1597 int ret = 0;
1598 const char *name;
1599
1600 ret = of_property_read_string(dev->of_node, "label", &name);
1601 if (ret < 0)
1602 name = dev->of_node->name;
1603
1604 return snprintf(buf, RPMSG_NAME_SIZE, "%s\n", name);
1605}
1606static DEVICE_ATTR_RO(rpmsg_name);
1607
1608static struct attribute *qcom_glink_attrs[] = {
1609 &dev_attr_rpmsg_name.attr,
1610 NULL
1611};
1612ATTRIBUTE_GROUPS(qcom_glink);
1613
1614static void qcom_glink_device_release(struct device *dev)
1615{
1616 struct rpmsg_device *rpdev = to_rpmsg_device(dev);
1617 struct glink_channel *channel = to_glink_channel(rpdev->ept);
1618
1619
1620 kref_put(&channel->refcount, qcom_glink_channel_release);
1621 kfree(rpdev);
1622}
1623
1624static int qcom_glink_create_chrdev(struct qcom_glink *glink)
1625{
1626 struct rpmsg_device *rpdev;
1627 struct glink_channel *channel;
1628
1629 rpdev = kzalloc(sizeof(*rpdev), GFP_KERNEL);
1630 if (!rpdev)
1631 return -ENOMEM;
1632
1633 channel = qcom_glink_alloc_channel(glink, "rpmsg_chrdev");
1634 if (IS_ERR(channel)) {
1635 kfree(rpdev);
1636 return PTR_ERR(channel);
1637 }
1638 channel->rpdev = rpdev;
1639
1640 rpdev->ept = &channel->ept;
1641 rpdev->ops = &glink_device_ops;
1642 rpdev->dev.parent = glink->dev;
1643 rpdev->dev.release = qcom_glink_device_release;
1644
1645 return rpmsg_chrdev_register_device(rpdev);
1646}
1647
1648struct qcom_glink *qcom_glink_native_probe(struct device *dev,
1649 unsigned long features,
1650 struct qcom_glink_pipe *rx,
1651 struct qcom_glink_pipe *tx,
1652 bool intentless)
1653{
1654 int irq;
1655 int ret;
1656 struct qcom_glink *glink;
1657
1658 glink = devm_kzalloc(dev, sizeof(*glink), GFP_KERNEL);
1659 if (!glink)
1660 return ERR_PTR(-ENOMEM);
1661
1662 glink->dev = dev;
1663 glink->tx_pipe = tx;
1664 glink->rx_pipe = rx;
1665
1666 glink->features = features;
1667 glink->intentless = intentless;
1668
1669 spin_lock_init(&glink->tx_lock);
1670 spin_lock_init(&glink->rx_lock);
1671 INIT_LIST_HEAD(&glink->rx_queue);
1672 INIT_WORK(&glink->rx_work, qcom_glink_work);
1673
1674 spin_lock_init(&glink->idr_lock);
1675 idr_init(&glink->lcids);
1676 idr_init(&glink->rcids);
1677
1678 glink->dev->groups = qcom_glink_groups;
1679
1680 ret = device_add_groups(dev, qcom_glink_groups);
1681 if (ret)
1682 dev_err(dev, "failed to add groups\n");
1683
1684 ret = of_property_read_string(dev->of_node, "label", &glink->name);
1685 if (ret < 0)
1686 glink->name = dev->of_node->name;
1687
1688 glink->mbox_client.dev = dev;
1689 glink->mbox_client.knows_txdone = true;
1690 glink->mbox_chan = mbox_request_channel(&glink->mbox_client, 0);
1691 if (IS_ERR(glink->mbox_chan)) {
1692 if (PTR_ERR(glink->mbox_chan) != -EPROBE_DEFER)
1693 dev_err(dev, "failed to acquire IPC channel\n");
1694 return ERR_CAST(glink->mbox_chan);
1695 }
1696
1697 irq = of_irq_get(dev->of_node, 0);
1698 ret = devm_request_irq(dev, irq,
1699 qcom_glink_native_intr,
1700 IRQF_NO_SUSPEND | IRQF_SHARED,
1701 "glink-native", glink);
1702 if (ret) {
1703 dev_err(dev, "failed to request IRQ\n");
1704 return ERR_PTR(ret);
1705 }
1706
1707 glink->irq = irq;
1708
1709 ret = qcom_glink_send_version(glink);
1710 if (ret)
1711 return ERR_PTR(ret);
1712
1713 ret = qcom_glink_create_chrdev(glink);
1714 if (ret)
1715 dev_err(glink->dev, "failed to register chrdev\n");
1716
1717 return glink;
1718}
1719EXPORT_SYMBOL_GPL(qcom_glink_native_probe);
1720
1721static int qcom_glink_remove_device(struct device *dev, void *data)
1722{
1723 device_unregister(dev);
1724
1725 return 0;
1726}
1727
1728void qcom_glink_native_remove(struct qcom_glink *glink)
1729{
1730 struct glink_channel *channel;
1731 int cid;
1732 int ret;
1733
1734 disable_irq(glink->irq);
1735 qcom_glink_cancel_rx_work(glink);
1736
1737 ret = device_for_each_child(glink->dev, NULL, qcom_glink_remove_device);
1738 if (ret)
1739 dev_warn(glink->dev, "Can't remove GLINK devices: %d\n", ret);
1740
1741
1742 idr_for_each_entry(&glink->lcids, channel, cid)
1743 kref_put(&channel->refcount, qcom_glink_channel_release);
1744
1745
1746 idr_for_each_entry(&glink->rcids, channel, cid)
1747 kref_put(&channel->refcount, qcom_glink_channel_release);
1748
1749 idr_destroy(&glink->lcids);
1750 idr_destroy(&glink->rcids);
1751 mbox_free_channel(glink->mbox_chan);
1752}
1753EXPORT_SYMBOL_GPL(qcom_glink_native_remove);
1754
1755void qcom_glink_native_unregister(struct qcom_glink *glink)
1756{
1757 device_unregister(glink->dev);
1758}
1759EXPORT_SYMBOL_GPL(qcom_glink_native_unregister);
1760
1761MODULE_DESCRIPTION("Qualcomm GLINK driver");
1762MODULE_LICENSE("GPL v2");
1763