1 // SPDX-License-Identifier: GPL-2.0
3 * Copyright (c) 2016-2017, Linaro Ltd
7 #include <linux/interrupt.h>
9 #include <linux/list.h>
10 #include <linux/mfd/syscon.h>
11 #include <linux/module.h>
13 #include <linux/of_address.h>
14 #include <linux/platform_device.h>
15 #include <linux/regmap.h>
16 #include <linux/rpmsg.h>
17 #include <linux/sizes.h>
18 #include <linux/slab.h>
19 #include <linux/wait.h>
20 #include <linux/workqueue.h>
21 #include <linux/mailbox_client.h>
23 #include "rpmsg_internal.h"
24 #include "qcom_glink_native.h"
26 #define GLINK_NAME_SIZE 32
27 #define GLINK_VERSION_1 1
29 #define RPM_GLINK_CID_MIN 1
30 #define RPM_GLINK_CID_MAX 65536
40 * struct glink_defer_cmd - deferred incoming control message
42 * @msg: message header
43 * @data: payload of the message
45 * Copy of a received control message, to be added to @rx_queue and processed
46 * by @rx_work of @qcom_glink.
48 struct glink_defer_cmd
{
49 struct list_head node
;
56 * struct glink_core_rx_intent - RX intent
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)
67 struct glink_core_rx_intent
{
75 struct list_head node
;
79 * struct qcom_glink - driver context, relates to one remote subsystem
80 * @dev: reference to the associated struct device
81 * @rx_pipe: pipe object for receive FIFO
82 * @tx_pipe: pipe object for transmit FIFO
83 * @rx_work: worker for handling received control messages
84 * @rx_lock: protects the @rx_queue
85 * @rx_queue: queue of received control messages to be processed in @rx_work
86 * @tx_lock: synchronizes operations on the tx fifo
87 * @idr_lock: synchronizes @lcids and @rcids modifications
88 * @lcids: idr of all channels with a known local channel id
89 * @rcids: idr of all channels with a known remote channel id
90 * @features: remote features
91 * @intentless: flag to indicate that there is no intent
92 * @tx_avail_notify: Waitqueue for pending tx tasks
93 * @sent_read_notify: flag to check cmd sent or not
94 * @abort_tx: flag indicating that all tx attempts should fail
99 struct qcom_glink_pipe
*rx_pipe
;
100 struct qcom_glink_pipe
*tx_pipe
;
102 struct work_struct rx_work
;
104 struct list_head rx_queue
;
111 unsigned long features
;
114 wait_queue_head_t tx_avail_notify
;
115 bool sent_read_notify
;
128 * struct glink_channel - internal representation of a channel
129 * @rpdev: rpdev reference, only used for primary endpoints
130 * @ept: rpmsg endpoint this channel is associated with
131 * @glink: qcom_glink context handle
132 * @refcount: refcount for the channel object
133 * @recv_lock: guard for @ept.cb
134 * @name: unique channel name/identifier
135 * @lcid: channel id, in local space
136 * @rcid: channel id, in remote space
137 * @intent_lock: lock for protection of @liids, @riids
138 * @liids: idr of all local intents
139 * @riids: idr of all remote intents
140 * @intent_work: worker responsible for transmitting rx_done packets
141 * @done_intents: list of intents that needs to be announced rx_done
142 * @buf: receive buffer, for gathering fragments
143 * @buf_offset: write offset in @buf
144 * @buf_size: size of current @buf
145 * @open_ack: completed once remote has acked the open-request
146 * @open_req: completed once open-request has been received
147 * @intent_req_lock: Synchronises multiple intent requests
148 * @intent_req_result: Result of intent request
149 * @intent_received: flag indicating that an intent has been received
150 * @intent_req_wq: wait queue for intent_req signalling
152 struct glink_channel
{
153 struct rpmsg_endpoint ept
;
155 struct rpmsg_device
*rpdev
;
156 struct qcom_glink
*glink
;
158 struct kref refcount
;
160 spinlock_t recv_lock
;
166 spinlock_t intent_lock
;
169 struct work_struct intent_work
;
170 struct list_head done_intents
;
172 struct glink_core_rx_intent
*buf
;
176 struct completion open_ack
;
177 struct completion open_req
;
179 struct mutex intent_req_lock
;
180 int intent_req_result
;
181 bool intent_received
;
182 wait_queue_head_t intent_req_wq
;
185 #define to_glink_channel(_ept) container_of(_ept, struct glink_channel, ept)
187 static const struct rpmsg_endpoint_ops glink_endpoint_ops
;
189 #define GLINK_CMD_VERSION 0
190 #define GLINK_CMD_VERSION_ACK 1
191 #define GLINK_CMD_OPEN 2
192 #define GLINK_CMD_CLOSE 3
193 #define GLINK_CMD_OPEN_ACK 4
194 #define GLINK_CMD_INTENT 5
195 #define GLINK_CMD_RX_DONE 6
196 #define GLINK_CMD_RX_INTENT_REQ 7
197 #define GLINK_CMD_RX_INTENT_REQ_ACK 8
198 #define GLINK_CMD_TX_DATA 9
199 #define GLINK_CMD_CLOSE_ACK 11
200 #define GLINK_CMD_TX_DATA_CONT 12
201 #define GLINK_CMD_READ_NOTIF 13
202 #define GLINK_CMD_RX_DONE_W_REUSE 14
203 #define GLINK_CMD_SIGNALS 15
205 #define GLINK_FEATURE_INTENTLESS BIT(1)
207 #define NATIVE_DTR_SIG NATIVE_DSR_SIG
208 #define NATIVE_DSR_SIG BIT(31)
209 #define NATIVE_RTS_SIG NATIVE_CTS_SIG
210 #define NATIVE_CTS_SIG BIT(30)
212 static void qcom_glink_rx_done_work(struct work_struct
*work
);
214 static struct glink_channel
*qcom_glink_alloc_channel(struct qcom_glink
*glink
,
217 struct glink_channel
*channel
;
219 channel
= kzalloc(sizeof(*channel
), GFP_KERNEL
);
221 return ERR_PTR(-ENOMEM
);
223 /* Setup glink internal glink_channel data */
224 spin_lock_init(&channel
->recv_lock
);
225 spin_lock_init(&channel
->intent_lock
);
226 mutex_init(&channel
->intent_req_lock
);
228 channel
->glink
= glink
;
229 channel
->name
= kstrdup(name
, GFP_KERNEL
);
230 if (!channel
->name
) {
232 return ERR_PTR(-ENOMEM
);
235 init_completion(&channel
->open_req
);
236 init_completion(&channel
->open_ack
);
237 init_waitqueue_head(&channel
->intent_req_wq
);
239 INIT_LIST_HEAD(&channel
->done_intents
);
240 INIT_WORK(&channel
->intent_work
, qcom_glink_rx_done_work
);
242 idr_init(&channel
->liids
);
243 idr_init(&channel
->riids
);
244 kref_init(&channel
->refcount
);
249 static void qcom_glink_channel_release(struct kref
*ref
)
251 struct glink_channel
*channel
= container_of(ref
, struct glink_channel
,
253 struct glink_core_rx_intent
*intent
;
254 struct glink_core_rx_intent
*tmp
;
258 /* cancel pending rx_done work */
259 cancel_work_sync(&channel
->intent_work
);
261 spin_lock_irqsave(&channel
->intent_lock
, flags
);
262 /* Free all non-reuse intents pending rx_done work */
263 list_for_each_entry_safe(intent
, tmp
, &channel
->done_intents
, node
) {
264 if (!intent
->reuse
) {
270 idr_for_each_entry(&channel
->liids
, tmp
, iid
) {
274 idr_destroy(&channel
->liids
);
276 idr_for_each_entry(&channel
->riids
, tmp
, iid
)
278 idr_destroy(&channel
->riids
);
279 spin_unlock_irqrestore(&channel
->intent_lock
, flags
);
281 kfree(channel
->name
);
285 static size_t qcom_glink_rx_avail(struct qcom_glink
*glink
)
287 return glink
->rx_pipe
->avail(glink
->rx_pipe
);
290 static void qcom_glink_rx_peek(struct qcom_glink
*glink
,
291 void *data
, unsigned int offset
, size_t count
)
293 glink
->rx_pipe
->peek(glink
->rx_pipe
, data
, offset
, count
);
296 static void qcom_glink_rx_advance(struct qcom_glink
*glink
, size_t count
)
298 glink
->rx_pipe
->advance(glink
->rx_pipe
, count
);
301 static size_t qcom_glink_tx_avail(struct qcom_glink
*glink
)
303 return glink
->tx_pipe
->avail(glink
->tx_pipe
);
306 static void qcom_glink_tx_write(struct qcom_glink
*glink
,
307 const void *hdr
, size_t hlen
,
308 const void *data
, size_t dlen
)
310 glink
->tx_pipe
->write(glink
->tx_pipe
, hdr
, hlen
, data
, dlen
);
313 static void qcom_glink_tx_kick(struct qcom_glink
*glink
)
315 glink
->tx_pipe
->kick(glink
->tx_pipe
);
318 static void qcom_glink_send_read_notify(struct qcom_glink
*glink
)
320 struct glink_msg msg
;
322 msg
.cmd
= cpu_to_le16(GLINK_CMD_READ_NOTIF
);
326 qcom_glink_tx_write(glink
, &msg
, sizeof(msg
), NULL
, 0);
328 qcom_glink_tx_kick(glink
);
331 static int qcom_glink_tx(struct qcom_glink
*glink
,
332 const void *hdr
, size_t hlen
,
333 const void *data
, size_t dlen
, bool wait
)
335 unsigned int tlen
= hlen
+ dlen
;
339 /* Reject packets that are too big */
340 if (tlen
>= glink
->tx_pipe
->length
)
343 spin_lock_irqsave(&glink
->tx_lock
, flags
);
345 if (glink
->abort_tx
) {
350 while (qcom_glink_tx_avail(glink
) < tlen
) {
356 if (glink
->abort_tx
) {
361 if (!glink
->sent_read_notify
) {
362 glink
->sent_read_notify
= true;
363 qcom_glink_send_read_notify(glink
);
366 /* Wait without holding the tx_lock */
367 spin_unlock_irqrestore(&glink
->tx_lock
, flags
);
369 wait_event_timeout(glink
->tx_avail_notify
,
370 qcom_glink_tx_avail(glink
) >= tlen
, 10 * HZ
);
372 spin_lock_irqsave(&glink
->tx_lock
, flags
);
374 if (qcom_glink_tx_avail(glink
) >= tlen
)
375 glink
->sent_read_notify
= false;
378 qcom_glink_tx_write(glink
, hdr
, hlen
, data
, dlen
);
379 qcom_glink_tx_kick(glink
);
382 spin_unlock_irqrestore(&glink
->tx_lock
, flags
);
387 static int qcom_glink_send_version(struct qcom_glink
*glink
)
389 struct glink_msg msg
;
391 msg
.cmd
= cpu_to_le16(GLINK_CMD_VERSION
);
392 msg
.param1
= cpu_to_le16(GLINK_VERSION_1
);
393 msg
.param2
= cpu_to_le32(glink
->features
);
395 return qcom_glink_tx(glink
, &msg
, sizeof(msg
), NULL
, 0, true);
398 static void qcom_glink_send_version_ack(struct qcom_glink
*glink
)
400 struct glink_msg msg
;
402 msg
.cmd
= cpu_to_le16(GLINK_CMD_VERSION_ACK
);
403 msg
.param1
= cpu_to_le16(GLINK_VERSION_1
);
404 msg
.param2
= cpu_to_le32(glink
->features
);
406 qcom_glink_tx(glink
, &msg
, sizeof(msg
), NULL
, 0, true);
409 static void qcom_glink_send_open_ack(struct qcom_glink
*glink
,
410 struct glink_channel
*channel
)
412 struct glink_msg msg
;
414 msg
.cmd
= cpu_to_le16(GLINK_CMD_OPEN_ACK
);
415 msg
.param1
= cpu_to_le16(channel
->rcid
);
416 msg
.param2
= cpu_to_le32(0);
418 qcom_glink_tx(glink
, &msg
, sizeof(msg
), NULL
, 0, true);
421 static void qcom_glink_handle_intent_req_ack(struct qcom_glink
*glink
,
422 unsigned int cid
, bool granted
)
424 struct glink_channel
*channel
;
427 spin_lock_irqsave(&glink
->idr_lock
, flags
);
428 channel
= idr_find(&glink
->rcids
, cid
);
429 spin_unlock_irqrestore(&glink
->idr_lock
, flags
);
431 dev_err(glink
->dev
, "unable to find channel\n");
435 WRITE_ONCE(channel
->intent_req_result
, granted
);
436 wake_up_all(&channel
->intent_req_wq
);
439 static void qcom_glink_intent_req_abort(struct glink_channel
*channel
)
441 WRITE_ONCE(channel
->intent_req_result
, 0);
442 wake_up_all(&channel
->intent_req_wq
);
446 * qcom_glink_send_open_req() - send a GLINK_CMD_OPEN request to the remote
447 * @glink: Ptr to the glink edge
448 * @channel: Ptr to the channel that the open req is sent
450 * Allocates a local channel id and sends a GLINK_CMD_OPEN message to the remote.
451 * Will return with refcount held, regardless of outcome.
453 * Return: 0 on success, negative errno otherwise.
455 static int qcom_glink_send_open_req(struct qcom_glink
*glink
,
456 struct glink_channel
*channel
)
459 struct glink_msg msg
;
460 u8 name
[GLINK_NAME_SIZE
];
462 int name_len
= strlen(channel
->name
) + 1;
463 int req_len
= ALIGN(sizeof(req
.msg
) + name_len
, 8);
467 kref_get(&channel
->refcount
);
469 spin_lock_irqsave(&glink
->idr_lock
, flags
);
470 ret
= idr_alloc_cyclic(&glink
->lcids
, channel
,
471 RPM_GLINK_CID_MIN
, RPM_GLINK_CID_MAX
,
473 spin_unlock_irqrestore(&glink
->idr_lock
, flags
);
479 req
.msg
.cmd
= cpu_to_le16(GLINK_CMD_OPEN
);
480 req
.msg
.param1
= cpu_to_le16(channel
->lcid
);
481 req
.msg
.param2
= cpu_to_le32(name_len
);
482 strcpy(req
.name
, channel
->name
);
484 ret
= qcom_glink_tx(glink
, &req
, req_len
, NULL
, 0, true);
491 spin_lock_irqsave(&glink
->idr_lock
, flags
);
492 idr_remove(&glink
->lcids
, channel
->lcid
);
494 spin_unlock_irqrestore(&glink
->idr_lock
, flags
);
499 static void qcom_glink_send_close_req(struct qcom_glink
*glink
,
500 struct glink_channel
*channel
)
502 struct glink_msg req
;
504 req
.cmd
= cpu_to_le16(GLINK_CMD_CLOSE
);
505 req
.param1
= cpu_to_le16(channel
->lcid
);
508 qcom_glink_tx(glink
, &req
, sizeof(req
), NULL
, 0, true);
511 static void qcom_glink_send_close_ack(struct qcom_glink
*glink
,
514 struct glink_msg req
;
516 req
.cmd
= cpu_to_le16(GLINK_CMD_CLOSE_ACK
);
517 req
.param1
= cpu_to_le16(rcid
);
520 qcom_glink_tx(glink
, &req
, sizeof(req
), NULL
, 0, true);
523 static void qcom_glink_rx_done_work(struct work_struct
*work
)
525 struct glink_channel
*channel
= container_of(work
, struct glink_channel
,
527 struct qcom_glink
*glink
= channel
->glink
;
528 struct glink_core_rx_intent
*intent
, *tmp
;
535 unsigned int cid
= channel
->lcid
;
540 spin_lock_irqsave(&channel
->intent_lock
, flags
);
541 list_for_each_entry_safe(intent
, tmp
, &channel
->done_intents
, node
) {
542 list_del(&intent
->node
);
543 spin_unlock_irqrestore(&channel
->intent_lock
, flags
);
545 reuse
= intent
->reuse
;
547 cmd
.id
= reuse
? GLINK_CMD_RX_DONE_W_REUSE
: GLINK_CMD_RX_DONE
;
551 qcom_glink_tx(glink
, &cmd
, sizeof(cmd
), NULL
, 0, true);
556 spin_lock_irqsave(&channel
->intent_lock
, flags
);
558 spin_unlock_irqrestore(&channel
->intent_lock
, flags
);
561 static void qcom_glink_rx_done(struct qcom_glink
*glink
,
562 struct glink_channel
*channel
,
563 struct glink_core_rx_intent
*intent
)
565 /* We don't send RX_DONE to intentless systems */
566 if (glink
->intentless
) {
572 /* Take it off the tree of receive intents */
573 if (!intent
->reuse
) {
574 spin_lock(&channel
->intent_lock
);
575 idr_remove(&channel
->liids
, intent
->id
);
576 spin_unlock(&channel
->intent_lock
);
579 /* Schedule the sending of a rx_done indication */
580 spin_lock(&channel
->intent_lock
);
581 list_add_tail(&intent
->node
, &channel
->done_intents
);
582 spin_unlock(&channel
->intent_lock
);
584 schedule_work(&channel
->intent_work
);
588 * qcom_glink_receive_version() - receive version/features from remote system
590 * @glink: pointer to transport interface
591 * @version: remote version
592 * @features: remote features
594 * This function is called in response to a remote-initiated version/feature
595 * negotiation sequence.
597 static void qcom_glink_receive_version(struct qcom_glink
*glink
,
604 case GLINK_VERSION_1
:
605 glink
->features
&= features
;
608 qcom_glink_send_version_ack(glink
);
614 * qcom_glink_receive_version_ack() - receive negotiation ack from remote system
616 * @glink: pointer to transport interface
617 * @version: remote version response
618 * @features: remote features response
620 * This function is called in response to a local-initiated version/feature
621 * negotiation sequence and is the counter-offer from the remote side based
622 * upon the initial version and feature set requested.
624 static void qcom_glink_receive_version_ack(struct qcom_glink
*glink
,
630 /* Version negotiation failed */
632 case GLINK_VERSION_1
:
633 if (features
== glink
->features
)
636 glink
->features
&= features
;
639 qcom_glink_send_version(glink
);
645 * qcom_glink_send_intent_req_ack() - convert an rx intent request ack cmd to
646 * wire format and transmit
647 * @glink: The transport to transmit on.
648 * @channel: The glink channel
649 * @granted: The request response to encode.
651 * Return: 0 on success or standard Linux error code.
653 static int qcom_glink_send_intent_req_ack(struct qcom_glink
*glink
,
654 struct glink_channel
*channel
,
657 struct glink_msg msg
;
659 msg
.cmd
= cpu_to_le16(GLINK_CMD_RX_INTENT_REQ_ACK
);
660 msg
.param1
= cpu_to_le16(channel
->lcid
);
661 msg
.param2
= cpu_to_le32(granted
);
663 qcom_glink_tx(glink
, &msg
, sizeof(msg
), NULL
, 0, true);
669 * qcom_glink_advertise_intent - convert an rx intent cmd to wire format and
671 * @glink: The transport to transmit on.
672 * @channel: The local channel
673 * @intent: The intent to pass on to remote.
675 * Return: 0 on success or standard Linux error code.
677 static int qcom_glink_advertise_intent(struct qcom_glink
*glink
,
678 struct glink_channel
*channel
,
679 struct glink_core_rx_intent
*intent
)
690 cmd
.id
= cpu_to_le16(GLINK_CMD_INTENT
);
691 cmd
.lcid
= cpu_to_le16(channel
->lcid
);
692 cmd
.count
= cpu_to_le32(1);
693 cmd
.size
= cpu_to_le32(intent
->size
);
694 cmd
.liid
= cpu_to_le32(intent
->id
);
696 qcom_glink_tx(glink
, &cmd
, sizeof(cmd
), NULL
, 0, true);
701 static struct glink_core_rx_intent
*
702 qcom_glink_alloc_intent(struct qcom_glink
*glink
,
703 struct glink_channel
*channel
,
707 struct glink_core_rx_intent
*intent
;
711 intent
= kzalloc(sizeof(*intent
), GFP_KERNEL
);
715 intent
->data
= kzalloc(size
, GFP_KERNEL
);
719 spin_lock_irqsave(&channel
->intent_lock
, flags
);
720 ret
= idr_alloc_cyclic(&channel
->liids
, intent
, 1, -1, GFP_ATOMIC
);
722 spin_unlock_irqrestore(&channel
->intent_lock
, flags
);
725 spin_unlock_irqrestore(&channel
->intent_lock
, flags
);
729 intent
->reuse
= reuseable
;
740 static void qcom_glink_handle_rx_done(struct qcom_glink
*glink
,
741 u32 cid
, uint32_t iid
,
744 struct glink_core_rx_intent
*intent
;
745 struct glink_channel
*channel
;
748 spin_lock_irqsave(&glink
->idr_lock
, flags
);
749 channel
= idr_find(&glink
->rcids
, cid
);
750 spin_unlock_irqrestore(&glink
->idr_lock
, flags
);
752 dev_err(glink
->dev
, "invalid channel id received\n");
756 spin_lock_irqsave(&channel
->intent_lock
, flags
);
757 intent
= idr_find(&channel
->riids
, iid
);
760 spin_unlock_irqrestore(&channel
->intent_lock
, flags
);
761 dev_err(glink
->dev
, "invalid intent id received\n");
765 intent
->in_use
= false;
768 idr_remove(&channel
->riids
, intent
->id
);
771 spin_unlock_irqrestore(&channel
->intent_lock
, flags
);
774 WRITE_ONCE(channel
->intent_received
, true);
775 wake_up_all(&channel
->intent_req_wq
);
780 * qcom_glink_handle_intent_req() - Receive a request for rx_intent
782 * @glink: Pointer to the transport interface
783 * @cid: Remote channel ID
784 * @size: size of the intent
786 * The function searches for the local channel to which the request for
787 * rx_intent has arrived and allocates and notifies the remote back
789 static void qcom_glink_handle_intent_req(struct qcom_glink
*glink
,
790 u32 cid
, size_t size
)
792 struct glink_core_rx_intent
*intent
;
793 struct glink_channel
*channel
;
796 spin_lock_irqsave(&glink
->idr_lock
, flags
);
797 channel
= idr_find(&glink
->rcids
, cid
);
798 spin_unlock_irqrestore(&glink
->idr_lock
, flags
);
801 pr_err("%s channel not found for cid %d\n", __func__
, cid
);
805 intent
= qcom_glink_alloc_intent(glink
, channel
, size
, false);
807 qcom_glink_advertise_intent(glink
, channel
, intent
);
809 qcom_glink_send_intent_req_ack(glink
, channel
, !!intent
);
812 static int qcom_glink_rx_defer(struct qcom_glink
*glink
, size_t extra
)
814 struct glink_defer_cmd
*dcmd
;
816 extra
= ALIGN(extra
, 8);
818 if (qcom_glink_rx_avail(glink
) < sizeof(struct glink_msg
) + extra
) {
819 dev_dbg(glink
->dev
, "Insufficient data in rx fifo");
823 dcmd
= kzalloc(struct_size(dcmd
, data
, extra
), GFP_ATOMIC
);
827 INIT_LIST_HEAD(&dcmd
->node
);
829 qcom_glink_rx_peek(glink
, &dcmd
->msg
, 0, sizeof(dcmd
->msg
) + extra
);
831 spin_lock(&glink
->rx_lock
);
832 list_add_tail(&dcmd
->node
, &glink
->rx_queue
);
833 spin_unlock(&glink
->rx_lock
);
835 schedule_work(&glink
->rx_work
);
836 qcom_glink_rx_advance(glink
, sizeof(dcmd
->msg
) + extra
);
841 static int qcom_glink_rx_data(struct qcom_glink
*glink
, size_t avail
)
843 struct glink_core_rx_intent
*intent
;
844 struct glink_channel
*channel
;
846 struct glink_msg msg
;
850 unsigned int chunk_size
;
851 unsigned int left_size
;
857 if (avail
< sizeof(hdr
)) {
858 dev_dbg(glink
->dev
, "Not enough data in fifo\n");
862 qcom_glink_rx_peek(glink
, &hdr
, 0, sizeof(hdr
));
863 chunk_size
= le32_to_cpu(hdr
.chunk_size
);
864 left_size
= le32_to_cpu(hdr
.left_size
);
866 if (avail
< sizeof(hdr
) + chunk_size
) {
867 dev_dbg(glink
->dev
, "Payload not yet in fifo\n");
871 rcid
= le16_to_cpu(hdr
.msg
.param1
);
872 spin_lock_irqsave(&glink
->idr_lock
, flags
);
873 channel
= idr_find(&glink
->rcids
, rcid
);
874 spin_unlock_irqrestore(&glink
->idr_lock
, flags
);
876 dev_dbg(glink
->dev
, "Data on non-existing channel\n");
878 /* Drop the message */
882 if (glink
->intentless
) {
883 /* Might have an ongoing, fragmented, message to append */
885 intent
= kzalloc(sizeof(*intent
), GFP_ATOMIC
);
889 intent
->data
= kmalloc(chunk_size
+ left_size
,
896 intent
->id
= 0xbabababa;
897 intent
->size
= chunk_size
+ left_size
;
900 channel
->buf
= intent
;
902 intent
= channel
->buf
;
905 liid
= le32_to_cpu(hdr
.msg
.param2
);
907 spin_lock_irqsave(&channel
->intent_lock
, flags
);
908 intent
= idr_find(&channel
->liids
, liid
);
909 spin_unlock_irqrestore(&channel
->intent_lock
, flags
);
913 "no intent found for channel %s intent %d",
914 channel
->name
, liid
);
920 if (intent
->size
- intent
->offset
< chunk_size
) {
921 dev_err(glink
->dev
, "Insufficient space in intent\n");
923 /* The packet header lied, drop payload */
927 qcom_glink_rx_peek(glink
, intent
->data
+ intent
->offset
,
928 sizeof(hdr
), chunk_size
);
929 intent
->offset
+= chunk_size
;
931 /* Handle message when no fragments remain to be received */
933 spin_lock(&channel
->recv_lock
);
934 if (channel
->ept
.cb
) {
935 channel
->ept
.cb(channel
->ept
.rpdev
,
941 spin_unlock(&channel
->recv_lock
);
946 qcom_glink_rx_done(glink
, channel
, intent
);
950 qcom_glink_rx_advance(glink
, ALIGN(sizeof(hdr
) + chunk_size
, 8));
955 static void qcom_glink_handle_intent(struct qcom_glink
*glink
,
960 struct glink_core_rx_intent
*intent
;
961 struct glink_channel
*channel
;
968 struct glink_msg msg
;
969 struct intent_pair intents
[];
972 const size_t msglen
= struct_size(msg
, intents
, count
);
977 if (avail
< msglen
) {
978 dev_dbg(glink
->dev
, "Not enough data in fifo\n");
982 spin_lock_irqsave(&glink
->idr_lock
, flags
);
983 channel
= idr_find(&glink
->rcids
, cid
);
984 spin_unlock_irqrestore(&glink
->idr_lock
, flags
);
986 dev_err(glink
->dev
, "intents for non-existing channel\n");
987 qcom_glink_rx_advance(glink
, ALIGN(msglen
, 8));
991 msg
= kmalloc(msglen
, GFP_ATOMIC
);
995 qcom_glink_rx_peek(glink
, msg
, 0, msglen
);
997 for (i
= 0; i
< count
; ++i
) {
998 intent
= kzalloc(sizeof(*intent
), GFP_ATOMIC
);
1002 intent
->id
= le32_to_cpu(msg
->intents
[i
].iid
);
1003 intent
->size
= le32_to_cpu(msg
->intents
[i
].size
);
1005 spin_lock_irqsave(&channel
->intent_lock
, flags
);
1006 ret
= idr_alloc(&channel
->riids
, intent
,
1007 intent
->id
, intent
->id
+ 1, GFP_ATOMIC
);
1008 spin_unlock_irqrestore(&channel
->intent_lock
, flags
);
1011 dev_err(glink
->dev
, "failed to store remote intent\n");
1014 WRITE_ONCE(channel
->intent_received
, true);
1015 wake_up_all(&channel
->intent_req_wq
);
1018 qcom_glink_rx_advance(glink
, ALIGN(msglen
, 8));
1021 static int qcom_glink_rx_open_ack(struct qcom_glink
*glink
, unsigned int lcid
)
1023 struct glink_channel
*channel
;
1025 spin_lock(&glink
->idr_lock
);
1026 channel
= idr_find(&glink
->lcids
, lcid
);
1027 spin_unlock(&glink
->idr_lock
);
1029 dev_err(glink
->dev
, "Invalid open ack packet\n");
1033 complete_all(&channel
->open_ack
);
1039 * qcom_glink_set_flow_control() - convert a signal cmd to wire format and transmit
1040 * @ept: Rpmsg endpoint for channel.
1041 * @pause: Pause transmission
1042 * @dst: destination address of the endpoint
1044 * Return: 0 on success or standard Linux error code.
1046 static int qcom_glink_set_flow_control(struct rpmsg_endpoint
*ept
, bool pause
, u32 dst
)
1048 struct glink_channel
*channel
= to_glink_channel(ept
);
1049 struct qcom_glink
*glink
= channel
->glink
;
1050 struct glink_msg msg
;
1054 sigs
|= NATIVE_DTR_SIG
| NATIVE_RTS_SIG
;
1056 msg
.cmd
= cpu_to_le16(GLINK_CMD_SIGNALS
);
1057 msg
.param1
= cpu_to_le16(channel
->lcid
);
1058 msg
.param2
= cpu_to_le32(sigs
);
1060 return qcom_glink_tx(glink
, &msg
, sizeof(msg
), NULL
, 0, true);
1063 static void qcom_glink_handle_signals(struct qcom_glink
*glink
,
1064 unsigned int rcid
, unsigned int sigs
)
1066 struct glink_channel
*channel
;
1067 unsigned long flags
;
1070 spin_lock_irqsave(&glink
->idr_lock
, flags
);
1071 channel
= idr_find(&glink
->rcids
, rcid
);
1072 spin_unlock_irqrestore(&glink
->idr_lock
, flags
);
1074 dev_err(glink
->dev
, "signal for non-existing channel\n");
1078 enable
= sigs
& NATIVE_DSR_SIG
|| sigs
& NATIVE_CTS_SIG
;
1080 if (channel
->ept
.flow_cb
)
1081 channel
->ept
.flow_cb(channel
->ept
.rpdev
, channel
->ept
.priv
, enable
);
1084 void qcom_glink_native_rx(struct qcom_glink
*glink
)
1086 struct glink_msg msg
;
1087 unsigned int param1
;
1088 unsigned int param2
;
1093 /* To wakeup any blocking writers */
1094 wake_up_all(&glink
->tx_avail_notify
);
1097 avail
= qcom_glink_rx_avail(glink
);
1098 if (avail
< sizeof(msg
))
1101 qcom_glink_rx_peek(glink
, &msg
, 0, sizeof(msg
));
1103 cmd
= le16_to_cpu(msg
.cmd
);
1104 param1
= le16_to_cpu(msg
.param1
);
1105 param2
= le32_to_cpu(msg
.param2
);
1108 case GLINK_CMD_VERSION
:
1109 case GLINK_CMD_VERSION_ACK
:
1110 case GLINK_CMD_CLOSE
:
1111 case GLINK_CMD_CLOSE_ACK
:
1112 case GLINK_CMD_RX_INTENT_REQ
:
1113 ret
= qcom_glink_rx_defer(glink
, 0);
1115 case GLINK_CMD_OPEN_ACK
:
1116 ret
= qcom_glink_rx_open_ack(glink
, param1
);
1117 qcom_glink_rx_advance(glink
, ALIGN(sizeof(msg
), 8));
1119 case GLINK_CMD_OPEN
:
1120 ret
= qcom_glink_rx_defer(glink
, param2
);
1122 case GLINK_CMD_TX_DATA
:
1123 case GLINK_CMD_TX_DATA_CONT
:
1124 ret
= qcom_glink_rx_data(glink
, avail
);
1126 case GLINK_CMD_READ_NOTIF
:
1127 qcom_glink_rx_advance(glink
, ALIGN(sizeof(msg
), 8));
1128 qcom_glink_tx_kick(glink
);
1130 case GLINK_CMD_INTENT
:
1131 qcom_glink_handle_intent(glink
, param1
, param2
, avail
);
1133 case GLINK_CMD_RX_DONE
:
1134 qcom_glink_handle_rx_done(glink
, param1
, param2
, false);
1135 qcom_glink_rx_advance(glink
, ALIGN(sizeof(msg
), 8));
1137 case GLINK_CMD_RX_DONE_W_REUSE
:
1138 qcom_glink_handle_rx_done(glink
, param1
, param2
, true);
1139 qcom_glink_rx_advance(glink
, ALIGN(sizeof(msg
), 8));
1141 case GLINK_CMD_RX_INTENT_REQ_ACK
:
1142 qcom_glink_handle_intent_req_ack(glink
, param1
, param2
);
1143 qcom_glink_rx_advance(glink
, ALIGN(sizeof(msg
), 8));
1145 case GLINK_CMD_SIGNALS
:
1146 qcom_glink_handle_signals(glink
, param1
, param2
);
1147 qcom_glink_rx_advance(glink
, ALIGN(sizeof(msg
), 8));
1150 dev_err(glink
->dev
, "unhandled rx cmd: %d\n", cmd
);
1159 EXPORT_SYMBOL(qcom_glink_native_rx
);
1161 /* Locally initiated rpmsg_create_ept */
1162 static struct glink_channel
*qcom_glink_create_local(struct qcom_glink
*glink
,
1165 struct glink_channel
*channel
;
1167 unsigned long flags
;
1169 channel
= qcom_glink_alloc_channel(glink
, name
);
1170 if (IS_ERR(channel
))
1171 return ERR_CAST(channel
);
1173 ret
= qcom_glink_send_open_req(glink
, channel
);
1175 goto release_channel
;
1177 ret
= wait_for_completion_timeout(&channel
->open_ack
, 5 * HZ
);
1181 ret
= wait_for_completion_timeout(&channel
->open_req
, 5 * HZ
);
1185 qcom_glink_send_open_ack(glink
, channel
);
1190 /* qcom_glink_send_open_req() did register the channel in lcids*/
1191 spin_lock_irqsave(&glink
->idr_lock
, flags
);
1192 idr_remove(&glink
->lcids
, channel
->lcid
);
1193 spin_unlock_irqrestore(&glink
->idr_lock
, flags
);
1196 /* Release qcom_glink_send_open_req() reference */
1197 kref_put(&channel
->refcount
, qcom_glink_channel_release
);
1198 /* Release qcom_glink_alloc_channel() reference */
1199 kref_put(&channel
->refcount
, qcom_glink_channel_release
);
1201 return ERR_PTR(-ETIMEDOUT
);
1204 /* Remote initiated rpmsg_create_ept */
1205 static int qcom_glink_create_remote(struct qcom_glink
*glink
,
1206 struct glink_channel
*channel
)
1210 qcom_glink_send_open_ack(glink
, channel
);
1212 ret
= qcom_glink_send_open_req(glink
, channel
);
1216 ret
= wait_for_completion_timeout(&channel
->open_ack
, 5 * HZ
);
1226 * Send a close request to "undo" our open-ack. The close-ack will
1227 * release qcom_glink_send_open_req() reference and the last reference
1228 * will be relesed after receiving remote_close or transport unregister
1229 * by calling qcom_glink_native_remove().
1231 qcom_glink_send_close_req(glink
, channel
);
1236 static struct rpmsg_endpoint
*qcom_glink_create_ept(struct rpmsg_device
*rpdev
,
1239 struct rpmsg_channel_info
1242 struct glink_channel
*parent
= to_glink_channel(rpdev
->ept
);
1243 struct glink_channel
*channel
;
1244 struct qcom_glink
*glink
= parent
->glink
;
1245 struct rpmsg_endpoint
*ept
;
1246 const char *name
= chinfo
.name
;
1249 unsigned long flags
;
1251 spin_lock_irqsave(&glink
->idr_lock
, flags
);
1252 idr_for_each_entry(&glink
->rcids
, channel
, cid
) {
1253 if (!strcmp(channel
->name
, name
))
1256 spin_unlock_irqrestore(&glink
->idr_lock
, flags
);
1259 channel
= qcom_glink_create_local(glink
, name
);
1260 if (IS_ERR(channel
))
1263 ret
= qcom_glink_create_remote(glink
, channel
);
1268 ept
= &channel
->ept
;
1272 ept
->ops
= &glink_endpoint_ops
;
1277 static int qcom_glink_announce_create(struct rpmsg_device
*rpdev
)
1279 struct glink_channel
*channel
= to_glink_channel(rpdev
->ept
);
1280 struct device_node
*np
= rpdev
->dev
.of_node
;
1281 struct qcom_glink
*glink
= channel
->glink
;
1282 struct glink_core_rx_intent
*intent
;
1283 const struct property
*prop
= NULL
;
1284 __be32 defaults
[] = { cpu_to_be32(SZ_1K
), cpu_to_be32(5) };
1287 __be32
*val
= defaults
;
1290 if (glink
->intentless
|| !completion_done(&channel
->open_ack
))
1293 prop
= of_find_property(np
, "qcom,intents", NULL
);
1296 num_groups
= prop
->length
/ sizeof(u32
) / 2;
1299 /* Channel is now open, advertise base set of intents */
1300 while (num_groups
--) {
1301 size
= be32_to_cpup(val
++);
1302 num_intents
= be32_to_cpup(val
++);
1303 while (num_intents
--) {
1304 intent
= qcom_glink_alloc_intent(glink
, channel
, size
,
1309 qcom_glink_advertise_intent(glink
, channel
, intent
);
1315 static void qcom_glink_destroy_ept(struct rpmsg_endpoint
*ept
)
1317 struct glink_channel
*channel
= to_glink_channel(ept
);
1318 struct qcom_glink
*glink
= channel
->glink
;
1319 unsigned long flags
;
1321 spin_lock_irqsave(&channel
->recv_lock
, flags
);
1322 channel
->ept
.cb
= NULL
;
1323 spin_unlock_irqrestore(&channel
->recv_lock
, flags
);
1325 /* Decouple the potential rpdev from the channel */
1326 channel
->rpdev
= NULL
;
1328 qcom_glink_send_close_req(glink
, channel
);
1331 static int qcom_glink_request_intent(struct qcom_glink
*glink
,
1332 struct glink_channel
*channel
,
1343 mutex_lock(&channel
->intent_req_lock
);
1345 WRITE_ONCE(channel
->intent_req_result
, -1);
1346 WRITE_ONCE(channel
->intent_received
, false);
1348 cmd
.id
= GLINK_CMD_RX_INTENT_REQ
;
1349 cmd
.cid
= channel
->lcid
;
1352 ret
= qcom_glink_tx(glink
, &cmd
, sizeof(cmd
), NULL
, 0, true);
1356 ret
= wait_event_timeout(channel
->intent_req_wq
,
1357 READ_ONCE(channel
->intent_req_result
) >= 0 &&
1358 READ_ONCE(channel
->intent_received
),
1361 dev_err(glink
->dev
, "intent request timed out\n");
1364 ret
= READ_ONCE(channel
->intent_req_result
) ? 0 : -ECANCELED
;
1368 mutex_unlock(&channel
->intent_req_lock
);
1372 static int __qcom_glink_send(struct glink_channel
*channel
,
1373 void *data
, int len
, bool wait
)
1375 struct qcom_glink
*glink
= channel
->glink
;
1376 struct glink_core_rx_intent
*intent
= NULL
;
1377 struct glink_core_rx_intent
*tmp
;
1380 struct glink_msg msg
;
1385 unsigned long flags
;
1386 int chunk_size
= len
;
1389 if (!glink
->intentless
) {
1391 spin_lock_irqsave(&channel
->intent_lock
, flags
);
1392 idr_for_each_entry(&channel
->riids
, tmp
, iid
) {
1393 if (tmp
->size
>= len
&& !tmp
->in_use
) {
1396 else if (intent
->size
> tmp
->size
)
1398 if (intent
->size
== len
)
1403 intent
->in_use
= true;
1404 spin_unlock_irqrestore(&channel
->intent_lock
, flags
);
1406 /* We found an available intent */
1413 ret
= qcom_glink_request_intent(glink
, channel
, len
);
1421 while (offset
< len
) {
1422 chunk_size
= len
- offset
;
1423 if (chunk_size
> SZ_8K
&& wait
)
1426 req
.msg
.cmd
= cpu_to_le16(offset
== 0 ? GLINK_CMD_TX_DATA
: GLINK_CMD_TX_DATA_CONT
);
1427 req
.msg
.param1
= cpu_to_le16(channel
->lcid
);
1428 req
.msg
.param2
= cpu_to_le32(iid
);
1429 req
.chunk_size
= cpu_to_le32(chunk_size
);
1430 req
.left_size
= cpu_to_le32(len
- offset
- chunk_size
);
1432 ret
= qcom_glink_tx(glink
, &req
, sizeof(req
), data
+ offset
, chunk_size
, wait
);
1434 /* Mark intent available if we failed */
1436 intent
->in_use
= false;
1440 offset
+= chunk_size
;
1446 static int qcom_glink_send(struct rpmsg_endpoint
*ept
, void *data
, int len
)
1448 struct glink_channel
*channel
= to_glink_channel(ept
);
1450 return __qcom_glink_send(channel
, data
, len
, true);
1453 static int qcom_glink_trysend(struct rpmsg_endpoint
*ept
, void *data
, int len
)
1455 struct glink_channel
*channel
= to_glink_channel(ept
);
1457 return __qcom_glink_send(channel
, data
, len
, false);
1460 static int qcom_glink_sendto(struct rpmsg_endpoint
*ept
, void *data
, int len
, u32 dst
)
1462 struct glink_channel
*channel
= to_glink_channel(ept
);
1464 return __qcom_glink_send(channel
, data
, len
, true);
1467 static int qcom_glink_trysendto(struct rpmsg_endpoint
*ept
, void *data
, int len
, u32 dst
)
1469 struct glink_channel
*channel
= to_glink_channel(ept
);
1471 return __qcom_glink_send(channel
, data
, len
, false);
1475 * Finds the device_node for the glink child interested in this channel.
1477 static struct device_node
*qcom_glink_match_channel(struct device_node
*node
,
1478 const char *channel
)
1480 struct device_node
*child
;
1485 for_each_available_child_of_node(node
, child
) {
1486 key
= "qcom,glink-channels";
1487 ret
= of_property_read_string(child
, key
, &name
);
1491 if (strcmp(name
, channel
) == 0)
1498 static const struct rpmsg_device_ops glink_device_ops
= {
1499 .create_ept
= qcom_glink_create_ept
,
1500 .announce_create
= qcom_glink_announce_create
,
1503 static const struct rpmsg_endpoint_ops glink_endpoint_ops
= {
1504 .destroy_ept
= qcom_glink_destroy_ept
,
1505 .send
= qcom_glink_send
,
1506 .sendto
= qcom_glink_sendto
,
1507 .trysend
= qcom_glink_trysend
,
1508 .trysendto
= qcom_glink_trysendto
,
1509 .set_flow_control
= qcom_glink_set_flow_control
,
1512 static void qcom_glink_rpdev_release(struct device
*dev
)
1514 struct rpmsg_device
*rpdev
= to_rpmsg_device(dev
);
1516 kfree(rpdev
->driver_override
);
1520 static int qcom_glink_rx_open(struct qcom_glink
*glink
, unsigned int rcid
,
1523 struct glink_channel
*channel
;
1524 struct rpmsg_device
*rpdev
;
1525 bool create_device
= false;
1526 struct device_node
*node
;
1529 unsigned long flags
;
1531 spin_lock_irqsave(&glink
->idr_lock
, flags
);
1532 idr_for_each_entry(&glink
->lcids
, channel
, lcid
) {
1533 if (!strcmp(channel
->name
, name
))
1536 spin_unlock_irqrestore(&glink
->idr_lock
, flags
);
1539 channel
= qcom_glink_alloc_channel(glink
, name
);
1540 if (IS_ERR(channel
))
1541 return PTR_ERR(channel
);
1543 /* The opening dance was initiated by the remote */
1544 create_device
= true;
1547 spin_lock_irqsave(&glink
->idr_lock
, flags
);
1548 ret
= idr_alloc(&glink
->rcids
, channel
, rcid
, rcid
+ 1, GFP_ATOMIC
);
1550 dev_err(glink
->dev
, "Unable to insert channel into rcid list\n");
1551 spin_unlock_irqrestore(&glink
->idr_lock
, flags
);
1554 channel
->rcid
= ret
;
1555 spin_unlock_irqrestore(&glink
->idr_lock
, flags
);
1557 complete_all(&channel
->open_req
);
1559 if (create_device
) {
1560 rpdev
= kzalloc(sizeof(*rpdev
), GFP_KERNEL
);
1566 rpdev
->ept
= &channel
->ept
;
1567 strscpy_pad(rpdev
->id
.name
, name
, RPMSG_NAME_SIZE
);
1568 rpdev
->src
= RPMSG_ADDR_ANY
;
1569 rpdev
->dst
= RPMSG_ADDR_ANY
;
1570 rpdev
->ops
= &glink_device_ops
;
1572 node
= qcom_glink_match_channel(glink
->dev
->of_node
, name
);
1573 rpdev
->dev
.of_node
= node
;
1574 rpdev
->dev
.parent
= glink
->dev
;
1575 rpdev
->dev
.release
= qcom_glink_rpdev_release
;
1577 ret
= rpmsg_register_device(rpdev
);
1581 channel
->rpdev
= rpdev
;
1587 spin_lock_irqsave(&glink
->idr_lock
, flags
);
1588 idr_remove(&glink
->rcids
, channel
->rcid
);
1590 spin_unlock_irqrestore(&glink
->idr_lock
, flags
);
1592 /* Release the reference, iff we took it */
1594 kref_put(&channel
->refcount
, qcom_glink_channel_release
);
1599 static void qcom_glink_rx_close(struct qcom_glink
*glink
, unsigned int rcid
)
1601 struct rpmsg_channel_info chinfo
;
1602 struct glink_channel
*channel
;
1603 unsigned long flags
;
1605 spin_lock_irqsave(&glink
->idr_lock
, flags
);
1606 channel
= idr_find(&glink
->rcids
, rcid
);
1607 spin_unlock_irqrestore(&glink
->idr_lock
, flags
);
1608 if (WARN(!channel
, "close request on unknown channel\n"))
1611 /* cancel pending rx_done work */
1612 cancel_work_sync(&channel
->intent_work
);
1614 if (channel
->rpdev
) {
1615 strscpy_pad(chinfo
.name
, channel
->name
, sizeof(chinfo
.name
));
1616 chinfo
.src
= RPMSG_ADDR_ANY
;
1617 chinfo
.dst
= RPMSG_ADDR_ANY
;
1619 rpmsg_unregister_device(glink
->dev
, &chinfo
);
1621 channel
->rpdev
= NULL
;
1623 qcom_glink_send_close_ack(glink
, channel
->rcid
);
1625 spin_lock_irqsave(&glink
->idr_lock
, flags
);
1626 idr_remove(&glink
->rcids
, channel
->rcid
);
1628 spin_unlock_irqrestore(&glink
->idr_lock
, flags
);
1630 kref_put(&channel
->refcount
, qcom_glink_channel_release
);
1633 static void qcom_glink_rx_close_ack(struct qcom_glink
*glink
, unsigned int lcid
)
1635 struct rpmsg_channel_info chinfo
;
1636 struct glink_channel
*channel
;
1637 unsigned long flags
;
1639 /* To wakeup any blocking writers */
1640 wake_up_all(&glink
->tx_avail_notify
);
1642 spin_lock_irqsave(&glink
->idr_lock
, flags
);
1643 channel
= idr_find(&glink
->lcids
, lcid
);
1644 if (WARN(!channel
, "close ack on unknown channel\n")) {
1645 spin_unlock_irqrestore(&glink
->idr_lock
, flags
);
1649 idr_remove(&glink
->lcids
, channel
->lcid
);
1651 spin_unlock_irqrestore(&glink
->idr_lock
, flags
);
1653 /* Decouple the potential rpdev from the channel */
1654 if (channel
->rpdev
) {
1655 strscpy(chinfo
.name
, channel
->name
, sizeof(chinfo
.name
));
1656 chinfo
.src
= RPMSG_ADDR_ANY
;
1657 chinfo
.dst
= RPMSG_ADDR_ANY
;
1659 rpmsg_unregister_device(glink
->dev
, &chinfo
);
1661 channel
->rpdev
= NULL
;
1663 kref_put(&channel
->refcount
, qcom_glink_channel_release
);
1666 static void qcom_glink_work(struct work_struct
*work
)
1668 struct qcom_glink
*glink
= container_of(work
, struct qcom_glink
,
1670 struct glink_defer_cmd
*dcmd
;
1671 struct glink_msg
*msg
;
1672 unsigned long flags
;
1673 unsigned int param1
;
1674 unsigned int param2
;
1678 spin_lock_irqsave(&glink
->rx_lock
, flags
);
1679 if (list_empty(&glink
->rx_queue
)) {
1680 spin_unlock_irqrestore(&glink
->rx_lock
, flags
);
1683 dcmd
= list_first_entry(&glink
->rx_queue
,
1684 struct glink_defer_cmd
, node
);
1685 list_del(&dcmd
->node
);
1686 spin_unlock_irqrestore(&glink
->rx_lock
, flags
);
1689 cmd
= le16_to_cpu(msg
->cmd
);
1690 param1
= le16_to_cpu(msg
->param1
);
1691 param2
= le32_to_cpu(msg
->param2
);
1694 case GLINK_CMD_VERSION
:
1695 qcom_glink_receive_version(glink
, param1
, param2
);
1697 case GLINK_CMD_VERSION_ACK
:
1698 qcom_glink_receive_version_ack(glink
, param1
, param2
);
1700 case GLINK_CMD_OPEN
:
1701 qcom_glink_rx_open(glink
, param1
, msg
->data
);
1703 case GLINK_CMD_CLOSE
:
1704 qcom_glink_rx_close(glink
, param1
);
1706 case GLINK_CMD_CLOSE_ACK
:
1707 qcom_glink_rx_close_ack(glink
, param1
);
1709 case GLINK_CMD_RX_INTENT_REQ
:
1710 qcom_glink_handle_intent_req(glink
, param1
, param2
);
1713 WARN(1, "Unknown defer object %d\n", cmd
);
1721 static void qcom_glink_cancel_rx_work(struct qcom_glink
*glink
)
1723 struct glink_defer_cmd
*dcmd
;
1724 struct glink_defer_cmd
*tmp
;
1726 /* cancel any pending deferred rx_work */
1727 cancel_work_sync(&glink
->rx_work
);
1729 list_for_each_entry_safe(dcmd
, tmp
, &glink
->rx_queue
, node
)
1733 static ssize_t
rpmsg_name_show(struct device
*dev
,
1734 struct device_attribute
*attr
, char *buf
)
1739 ret
= of_property_read_string(dev
->of_node
, "label", &name
);
1741 name
= dev
->of_node
->name
;
1743 return sysfs_emit(buf
, "%s\n", name
);
1745 static DEVICE_ATTR_RO(rpmsg_name
);
1747 static struct attribute
*qcom_glink_attrs
[] = {
1748 &dev_attr_rpmsg_name
.attr
,
1751 ATTRIBUTE_GROUPS(qcom_glink
);
1753 static void qcom_glink_device_release(struct device
*dev
)
1755 struct rpmsg_device
*rpdev
= to_rpmsg_device(dev
);
1756 struct glink_channel
*channel
= to_glink_channel(rpdev
->ept
);
1758 /* Release qcom_glink_alloc_channel() reference */
1759 kref_put(&channel
->refcount
, qcom_glink_channel_release
);
1760 kfree(rpdev
->driver_override
);
1764 static int qcom_glink_create_chrdev(struct qcom_glink
*glink
)
1766 struct rpmsg_device
*rpdev
;
1767 struct glink_channel
*channel
;
1769 rpdev
= kzalloc(sizeof(*rpdev
), GFP_KERNEL
);
1773 channel
= qcom_glink_alloc_channel(glink
, "rpmsg_chrdev");
1774 if (IS_ERR(channel
)) {
1776 return PTR_ERR(channel
);
1778 channel
->rpdev
= rpdev
;
1780 rpdev
->ept
= &channel
->ept
;
1781 rpdev
->ops
= &glink_device_ops
;
1782 rpdev
->dev
.parent
= glink
->dev
;
1783 rpdev
->dev
.release
= qcom_glink_device_release
;
1785 return rpmsg_ctrldev_register_device(rpdev
);
1788 struct qcom_glink
*qcom_glink_native_probe(struct device
*dev
,
1789 unsigned long features
,
1790 struct qcom_glink_pipe
*rx
,
1791 struct qcom_glink_pipe
*tx
,
1795 struct qcom_glink
*glink
;
1797 glink
= devm_kzalloc(dev
, sizeof(*glink
), GFP_KERNEL
);
1799 return ERR_PTR(-ENOMEM
);
1802 glink
->tx_pipe
= tx
;
1803 glink
->rx_pipe
= rx
;
1805 glink
->features
= features
;
1806 glink
->intentless
= intentless
;
1808 spin_lock_init(&glink
->tx_lock
);
1809 spin_lock_init(&glink
->rx_lock
);
1810 INIT_LIST_HEAD(&glink
->rx_queue
);
1811 INIT_WORK(&glink
->rx_work
, qcom_glink_work
);
1812 init_waitqueue_head(&glink
->tx_avail_notify
);
1814 spin_lock_init(&glink
->idr_lock
);
1815 idr_init(&glink
->lcids
);
1816 idr_init(&glink
->rcids
);
1818 glink
->dev
->groups
= qcom_glink_groups
;
1820 ret
= device_add_groups(dev
, qcom_glink_groups
);
1822 dev_err(dev
, "failed to add groups\n");
1824 ret
= qcom_glink_send_version(glink
);
1826 return ERR_PTR(ret
);
1828 ret
= qcom_glink_create_chrdev(glink
);
1830 dev_err(glink
->dev
, "failed to register chrdev\n");
1834 EXPORT_SYMBOL_GPL(qcom_glink_native_probe
);
1836 static int qcom_glink_remove_device(struct device
*dev
, void *data
)
1838 device_unregister(dev
);
1843 void qcom_glink_native_remove(struct qcom_glink
*glink
)
1845 struct glink_channel
*channel
;
1846 unsigned long flags
;
1850 qcom_glink_cancel_rx_work(glink
);
1852 /* Fail all attempts at sending messages */
1853 spin_lock_irqsave(&glink
->tx_lock
, flags
);
1854 glink
->abort_tx
= true;
1855 wake_up_all(&glink
->tx_avail_notify
);
1856 spin_unlock_irqrestore(&glink
->tx_lock
, flags
);
1858 /* Abort any senders waiting for intent requests */
1859 spin_lock_irqsave(&glink
->idr_lock
, flags
);
1860 idr_for_each_entry(&glink
->lcids
, channel
, cid
)
1861 qcom_glink_intent_req_abort(channel
);
1862 spin_unlock_irqrestore(&glink
->idr_lock
, flags
);
1864 ret
= device_for_each_child(glink
->dev
, NULL
, qcom_glink_remove_device
);
1866 dev_warn(glink
->dev
, "Can't remove GLINK devices: %d\n", ret
);
1868 /* Release any defunct local channels, waiting for close-ack */
1869 idr_for_each_entry(&glink
->lcids
, channel
, cid
)
1870 kref_put(&channel
->refcount
, qcom_glink_channel_release
);
1872 /* Release any defunct local channels, waiting for close-req */
1873 idr_for_each_entry(&glink
->rcids
, channel
, cid
)
1874 kref_put(&channel
->refcount
, qcom_glink_channel_release
);
1876 idr_destroy(&glink
->lcids
);
1877 idr_destroy(&glink
->rcids
);
1879 EXPORT_SYMBOL_GPL(qcom_glink_native_remove
);
1881 MODULE_DESCRIPTION("Qualcomm GLINK driver");
1882 MODULE_LICENSE("GPL v2");