1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (c) 2015, Sony Mobile Communications AB.
4 * Copyright (c) 2012-2013, The Linux Foundation. All rights reserved.
5 */
6
7 #include <linux/interrupt.h>
8 #include <linux/list.h>
9 #include <linux/io.h>
10 #include <linux/of.h>
11 #include <linux/irq.h>
12 #include <linux/irqdomain.h>
13 #include <linux/mailbox_client.h>
14 #include <linux/mfd/syscon.h>
15 #include <linux/module.h>
16 #include <linux/platform_device.h>
17 #include <linux/pm_wakeirq.h>
18 #include <linux/regmap.h>
19 #include <linux/soc/qcom/smem.h>
20 #include <linux/soc/qcom/smem_state.h>
21 #include <linux/spinlock.h>
22
23 /*
24 * The Shared Memory Point to Point (SMP2P) protocol facilitates communication
25 * of a single 32-bit value between two processors. Each value has a single
26 * writer (the local side) and a single reader (the remote side). Values are
27 * uniquely identified in the system by the directed edge (local processor ID
28 * to remote processor ID) and a string identifier.
29 *
30 * Each processor is responsible for creating the outgoing SMEM items and each
31 * item is writable by the local processor and readable by the remote
32 * processor. By using two separate SMEM items that are single-reader and
33 * single-writer, SMP2P does not require any remote locking mechanisms.
34 *
35 * The driver uses the Linux GPIO and interrupt framework to expose a virtual
36 * GPIO for each outbound entry and a virtual interrupt controller for each
37 * inbound entry.
38 */
39
40 #define SMP2P_MAX_ENTRY 16
41 #define SMP2P_MAX_ENTRY_NAME 16
42
43 #define SMP2P_FEATURE_SSR_ACK 0x1
44 #define SMP2P_FLAGS_RESTART_DONE_BIT 0
45 #define SMP2P_FLAGS_RESTART_ACK_BIT 1
46
47 #define SMP2P_MAGIC 0x504d5324
48 #define SMP2P_ALL_FEATURES SMP2P_FEATURE_SSR_ACK
49
50 /**
51 * struct smp2p_smem_item - in memory communication structure
52 * @magic: magic number
53 * @version: version - must be 1
54 * @features: features flag - currently unused
55 * @local_pid: processor id of sending end
56 * @remote_pid: processor id of receiving end
57 * @total_entries: number of entries - always SMP2P_MAX_ENTRY
58 * @valid_entries: number of allocated entries
59 * @flags:
60 * @entries: individual communication entries
61 * @name: name of the entry
62 * @value: content of the entry
63 */
64 struct smp2p_smem_item {
65 u32 magic;
66 u8 version;
67 unsigned features:24;
68 u16 local_pid;
69 u16 remote_pid;
70 u16 total_entries;
71 u16 valid_entries;
72 u32 flags;
73
74 struct {
75 u8 name[SMP2P_MAX_ENTRY_NAME];
76 u32 value;
77 } entries[SMP2P_MAX_ENTRY];
78 } __packed;
79
80 /**
81 * struct smp2p_entry - driver context matching one entry
82 * @node: list entry to keep track of allocated entries
83 * @smp2p: reference to the device driver context
84 * @name: name of the entry, to match against smp2p_smem_item
85 * @value: pointer to smp2p_smem_item entry value
86 * @last_value: last handled value
87 * @domain: irq_domain for inbound entries
88 * @irq_enabled:bitmap to track enabled irq bits
89 * @irq_rising: bitmap to mark irq bits for rising detection
90 * @irq_falling:bitmap to mark irq bits for falling detection
91 * @state: smem state handle
92 * @lock: spinlock to protect read-modify-write of the value
93 */
94 struct smp2p_entry {
95 struct list_head node;
96 struct qcom_smp2p *smp2p;
97
98 const char *name;
99 u32 *value;
100 u32 last_value;
101
102 struct irq_domain *domain;
103 DECLARE_BITMAP(irq_enabled, 32);
104 DECLARE_BITMAP(irq_rising, 32);
105 DECLARE_BITMAP(irq_falling, 32);
106
107 struct qcom_smem_state *state;
108
109 spinlock_t lock;
110 };
111
112 #define SMP2P_INBOUND 0
113 #define SMP2P_OUTBOUND 1
114
115 /**
116 * struct qcom_smp2p - device driver context
117 * @dev: device driver handle
118 * @in: pointer to the inbound smem item
119 * @out: pointer to the outbound smem item
120 * @smem_items: ids of the two smem items
121 * @valid_entries: already scanned inbound entries
122 * @ssr_ack_enabled: SMP2P_FEATURE_SSR_ACK feature is supported and was enabled
123 * @ssr_ack: current cached state of the local ack bit
124 * @negotiation_done: whether negotiating finished
125 * @local_pid: processor id of the inbound edge
126 * @remote_pid: processor id of the outbound edge
127 * @ipc_regmap: regmap for the outbound ipc
128 * @ipc_offset: offset within the regmap
129 * @ipc_bit: bit in regmap@offset to kick to signal remote processor
130 * @mbox_client: mailbox client handle
131 * @mbox_chan: apcs ipc mailbox channel handle
132 * @inbound: list of inbound entries
133 * @outbound: list of outbound entries
134 */
135 struct qcom_smp2p {
136 struct device *dev;
137
138 struct smp2p_smem_item *in;
139 struct smp2p_smem_item *out;
140
141 unsigned smem_items[SMP2P_OUTBOUND + 1];
142
143 unsigned valid_entries;
144
145 bool ssr_ack_enabled;
146 bool ssr_ack;
147 bool negotiation_done;
148
149 unsigned local_pid;
150 unsigned remote_pid;
151
152 struct regmap *ipc_regmap;
153 int ipc_offset;
154 int ipc_bit;
155
156 struct mbox_client mbox_client;
157 struct mbox_chan *mbox_chan;
158
159 struct list_head inbound;
160 struct list_head outbound;
161 };
162
qcom_smp2p_kick(struct qcom_smp2p * smp2p)163 static void qcom_smp2p_kick(struct qcom_smp2p *smp2p)
164 {
165 /* Make sure any updated data is written before the kick */
166 wmb();
167
168 if (smp2p->mbox_chan) {
169 mbox_send_message(smp2p->mbox_chan, NULL);
170 mbox_client_txdone(smp2p->mbox_chan, 0);
171 } else {
172 regmap_write(smp2p->ipc_regmap, smp2p->ipc_offset, BIT(smp2p->ipc_bit));
173 }
174 }
175
qcom_smp2p_check_ssr(struct qcom_smp2p * smp2p)176 static bool qcom_smp2p_check_ssr(struct qcom_smp2p *smp2p)
177 {
178 struct smp2p_smem_item *in = smp2p->in;
179 bool restart;
180
181 if (!smp2p->ssr_ack_enabled)
182 return false;
183
184 restart = in->flags & BIT(SMP2P_FLAGS_RESTART_DONE_BIT);
185
186 return restart != smp2p->ssr_ack;
187 }
188
qcom_smp2p_do_ssr_ack(struct qcom_smp2p * smp2p)189 static void qcom_smp2p_do_ssr_ack(struct qcom_smp2p *smp2p)
190 {
191 struct smp2p_smem_item *out = smp2p->out;
192 u32 val;
193
194 smp2p->ssr_ack = !smp2p->ssr_ack;
195
196 val = out->flags & ~BIT(SMP2P_FLAGS_RESTART_ACK_BIT);
197 if (smp2p->ssr_ack)
198 val |= BIT(SMP2P_FLAGS_RESTART_ACK_BIT);
199 out->flags = val;
200
201 qcom_smp2p_kick(smp2p);
202 }
203
qcom_smp2p_negotiate(struct qcom_smp2p * smp2p)204 static void qcom_smp2p_negotiate(struct qcom_smp2p *smp2p)
205 {
206 struct smp2p_smem_item *out = smp2p->out;
207 struct smp2p_smem_item *in = smp2p->in;
208
209 if (in->version == out->version) {
210 out->features &= in->features;
211
212 if (out->features & SMP2P_FEATURE_SSR_ACK)
213 smp2p->ssr_ack_enabled = true;
214
215 smp2p->negotiation_done = true;
216 }
217 }
218
qcom_smp2p_notify_in(struct qcom_smp2p * smp2p)219 static void qcom_smp2p_notify_in(struct qcom_smp2p *smp2p)
220 {
221 struct smp2p_smem_item *in;
222 struct smp2p_entry *entry;
223 int irq_pin;
224 u32 status;
225 char buf[SMP2P_MAX_ENTRY_NAME];
226 u32 val;
227 int i;
228
229 in = smp2p->in;
230
231 /* Match newly created entries */
232 for (i = smp2p->valid_entries; i < in->valid_entries; i++) {
233 list_for_each_entry(entry, &smp2p->inbound, node) {
234 memcpy(buf, in->entries[i].name, sizeof(buf));
235 if (!strcmp(buf, entry->name)) {
236 entry->value = &in->entries[i].value;
237 break;
238 }
239 }
240 }
241 smp2p->valid_entries = i;
242
243 /* Fire interrupts based on any value changes */
244 list_for_each_entry(entry, &smp2p->inbound, node) {
245 /* Ignore entries not yet allocated by the remote side */
246 if (!entry->value)
247 continue;
248
249 val = readl(entry->value);
250
251 status = val ^ entry->last_value;
252 entry->last_value = val;
253
254 /* No changes of this entry? */
255 if (!status)
256 continue;
257
258 for_each_set_bit(i, entry->irq_enabled, 32) {
259 if (!(status & BIT(i)))
260 continue;
261
262 if ((val & BIT(i) && test_bit(i, entry->irq_rising)) ||
263 (!(val & BIT(i)) && test_bit(i, entry->irq_falling))) {
264 irq_pin = irq_find_mapping(entry->domain, i);
265 handle_nested_irq(irq_pin);
266 }
267 }
268 }
269 }
270
271 /**
272 * qcom_smp2p_intr() - interrupt handler for incoming notifications
273 * @irq: unused
274 * @data: smp2p driver context
275 *
276 * Handle notifications from the remote side to handle newly allocated entries
277 * or any changes to the state bits of existing entries.
278 */
qcom_smp2p_intr(int irq,void * data)279 static irqreturn_t qcom_smp2p_intr(int irq, void *data)
280 {
281 struct smp2p_smem_item *in;
282 struct qcom_smp2p *smp2p = data;
283 unsigned int smem_id = smp2p->smem_items[SMP2P_INBOUND];
284 unsigned int pid = smp2p->remote_pid;
285 bool ack_restart;
286 size_t size;
287
288 in = smp2p->in;
289
290 /* Acquire smem item, if not already found */
291 if (!in) {
292 in = qcom_smem_get(pid, smem_id, &size);
293 if (IS_ERR(in)) {
294 dev_err(smp2p->dev,
295 "Unable to acquire remote smp2p item\n");
296 goto out;
297 }
298
299 smp2p->in = in;
300 }
301
302 if (!smp2p->negotiation_done)
303 qcom_smp2p_negotiate(smp2p);
304
305 if (smp2p->negotiation_done) {
306 ack_restart = qcom_smp2p_check_ssr(smp2p);
307 qcom_smp2p_notify_in(smp2p);
308
309 if (ack_restart)
310 qcom_smp2p_do_ssr_ack(smp2p);
311 }
312
313 out:
314 return IRQ_HANDLED;
315 }
316
smp2p_mask_irq(struct irq_data * irqd)317 static void smp2p_mask_irq(struct irq_data *irqd)
318 {
319 struct smp2p_entry *entry = irq_data_get_irq_chip_data(irqd);
320 irq_hw_number_t irq = irqd_to_hwirq(irqd);
321
322 clear_bit(irq, entry->irq_enabled);
323 }
324
smp2p_unmask_irq(struct irq_data * irqd)325 static void smp2p_unmask_irq(struct irq_data *irqd)
326 {
327 struct smp2p_entry *entry = irq_data_get_irq_chip_data(irqd);
328 irq_hw_number_t irq = irqd_to_hwirq(irqd);
329
330 set_bit(irq, entry->irq_enabled);
331 }
332
smp2p_set_irq_type(struct irq_data * irqd,unsigned int type)333 static int smp2p_set_irq_type(struct irq_data *irqd, unsigned int type)
334 {
335 struct smp2p_entry *entry = irq_data_get_irq_chip_data(irqd);
336 irq_hw_number_t irq = irqd_to_hwirq(irqd);
337
338 if (!(type & IRQ_TYPE_EDGE_BOTH))
339 return -EINVAL;
340
341 if (type & IRQ_TYPE_EDGE_RISING)
342 set_bit(irq, entry->irq_rising);
343 else
344 clear_bit(irq, entry->irq_rising);
345
346 if (type & IRQ_TYPE_EDGE_FALLING)
347 set_bit(irq, entry->irq_falling);
348 else
349 clear_bit(irq, entry->irq_falling);
350
351 return 0;
352 }
353
354 static struct irq_chip smp2p_irq_chip = {
355 .name = "smp2p",
356 .irq_mask = smp2p_mask_irq,
357 .irq_unmask = smp2p_unmask_irq,
358 .irq_set_type = smp2p_set_irq_type,
359 };
360
smp2p_irq_map(struct irq_domain * d,unsigned int irq,irq_hw_number_t hw)361 static int smp2p_irq_map(struct irq_domain *d,
362 unsigned int irq,
363 irq_hw_number_t hw)
364 {
365 struct smp2p_entry *entry = d->host_data;
366
367 irq_set_chip_and_handler(irq, &smp2p_irq_chip, handle_level_irq);
368 irq_set_chip_data(irq, entry);
369 irq_set_nested_thread(irq, 1);
370 irq_set_noprobe(irq);
371
372 return 0;
373 }
374
375 static const struct irq_domain_ops smp2p_irq_ops = {
376 .map = smp2p_irq_map,
377 .xlate = irq_domain_xlate_twocell,
378 };
379
qcom_smp2p_inbound_entry(struct qcom_smp2p * smp2p,struct smp2p_entry * entry,struct device_node * node)380 static int qcom_smp2p_inbound_entry(struct qcom_smp2p *smp2p,
381 struct smp2p_entry *entry,
382 struct device_node *node)
383 {
384 entry->domain = irq_domain_add_linear(node, 32, &smp2p_irq_ops, entry);
385 if (!entry->domain) {
386 dev_err(smp2p->dev, "failed to add irq_domain\n");
387 return -ENOMEM;
388 }
389
390 return 0;
391 }
392
smp2p_update_bits(void * data,u32 mask,u32 value)393 static int smp2p_update_bits(void *data, u32 mask, u32 value)
394 {
395 struct smp2p_entry *entry = data;
396 unsigned long flags;
397 u32 orig;
398 u32 val;
399
400 spin_lock_irqsave(&entry->lock, flags);
401 val = orig = readl(entry->value);
402 val &= ~mask;
403 val |= value;
404 writel(val, entry->value);
405 spin_unlock_irqrestore(&entry->lock, flags);
406
407 if (val != orig)
408 qcom_smp2p_kick(entry->smp2p);
409
410 return 0;
411 }
412
413 static const struct qcom_smem_state_ops smp2p_state_ops = {
414 .update_bits = smp2p_update_bits,
415 };
416
qcom_smp2p_outbound_entry(struct qcom_smp2p * smp2p,struct smp2p_entry * entry,struct device_node * node)417 static int qcom_smp2p_outbound_entry(struct qcom_smp2p *smp2p,
418 struct smp2p_entry *entry,
419 struct device_node *node)
420 {
421 struct smp2p_smem_item *out = smp2p->out;
422 char buf[SMP2P_MAX_ENTRY_NAME] = {};
423
424 /* Allocate an entry from the smem item */
425 strlcpy(buf, entry->name, SMP2P_MAX_ENTRY_NAME);
426 memcpy(out->entries[out->valid_entries].name, buf, SMP2P_MAX_ENTRY_NAME);
427
428 /* Make the logical entry reference the physical value */
429 entry->value = &out->entries[out->valid_entries].value;
430
431 out->valid_entries++;
432
433 entry->state = qcom_smem_state_register(node, &smp2p_state_ops, entry);
434 if (IS_ERR(entry->state)) {
435 dev_err(smp2p->dev, "failed to register qcom_smem_state\n");
436 return PTR_ERR(entry->state);
437 }
438
439 return 0;
440 }
441
qcom_smp2p_alloc_outbound_item(struct qcom_smp2p * smp2p)442 static int qcom_smp2p_alloc_outbound_item(struct qcom_smp2p *smp2p)
443 {
444 struct smp2p_smem_item *out;
445 unsigned smem_id = smp2p->smem_items[SMP2P_OUTBOUND];
446 unsigned pid = smp2p->remote_pid;
447 int ret;
448
449 ret = qcom_smem_alloc(pid, smem_id, sizeof(*out));
450 if (ret < 0 && ret != -EEXIST) {
451 if (ret != -EPROBE_DEFER)
452 dev_err(smp2p->dev,
453 "unable to allocate local smp2p item\n");
454 return ret;
455 }
456
457 out = qcom_smem_get(pid, smem_id, NULL);
458 if (IS_ERR(out)) {
459 dev_err(smp2p->dev, "Unable to acquire local smp2p item\n");
460 return PTR_ERR(out);
461 }
462
463 memset(out, 0, sizeof(*out));
464 out->magic = SMP2P_MAGIC;
465 out->local_pid = smp2p->local_pid;
466 out->remote_pid = smp2p->remote_pid;
467 out->total_entries = SMP2P_MAX_ENTRY;
468 out->valid_entries = 0;
469 out->features = SMP2P_ALL_FEATURES;
470
471 /*
472 * Make sure the rest of the header is written before we validate the
473 * item by writing a valid version number.
474 */
475 wmb();
476 out->version = 1;
477
478 qcom_smp2p_kick(smp2p);
479
480 smp2p->out = out;
481
482 return 0;
483 }
484
smp2p_parse_ipc(struct qcom_smp2p * smp2p)485 static int smp2p_parse_ipc(struct qcom_smp2p *smp2p)
486 {
487 struct device_node *syscon;
488 struct device *dev = smp2p->dev;
489 const char *key;
490 int ret;
491
492 syscon = of_parse_phandle(dev->of_node, "qcom,ipc", 0);
493 if (!syscon) {
494 dev_err(dev, "no qcom,ipc node\n");
495 return -ENODEV;
496 }
497
498 smp2p->ipc_regmap = syscon_node_to_regmap(syscon);
499 of_node_put(syscon);
500 if (IS_ERR(smp2p->ipc_regmap))
501 return PTR_ERR(smp2p->ipc_regmap);
502
503 key = "qcom,ipc";
504 ret = of_property_read_u32_index(dev->of_node, key, 1, &smp2p->ipc_offset);
505 if (ret < 0) {
506 dev_err(dev, "no offset in %s\n", key);
507 return -EINVAL;
508 }
509
510 ret = of_property_read_u32_index(dev->of_node, key, 2, &smp2p->ipc_bit);
511 if (ret < 0) {
512 dev_err(dev, "no bit in %s\n", key);
513 return -EINVAL;
514 }
515
516 return 0;
517 }
518
qcom_smp2p_probe(struct platform_device * pdev)519 static int qcom_smp2p_probe(struct platform_device *pdev)
520 {
521 struct smp2p_entry *entry;
522 struct device_node *node;
523 struct qcom_smp2p *smp2p;
524 const char *key;
525 int irq;
526 int ret;
527
528 smp2p = devm_kzalloc(&pdev->dev, sizeof(*smp2p), GFP_KERNEL);
529 if (!smp2p)
530 return -ENOMEM;
531
532 smp2p->dev = &pdev->dev;
533 INIT_LIST_HEAD(&smp2p->inbound);
534 INIT_LIST_HEAD(&smp2p->outbound);
535
536 platform_set_drvdata(pdev, smp2p);
537
538 key = "qcom,smem";
539 ret = of_property_read_u32_array(pdev->dev.of_node, key,
540 smp2p->smem_items, 2);
541 if (ret)
542 return ret;
543
544 key = "qcom,local-pid";
545 ret = of_property_read_u32(pdev->dev.of_node, key, &smp2p->local_pid);
546 if (ret)
547 goto report_read_failure;
548
549 key = "qcom,remote-pid";
550 ret = of_property_read_u32(pdev->dev.of_node, key, &smp2p->remote_pid);
551 if (ret)
552 goto report_read_failure;
553
554 irq = platform_get_irq(pdev, 0);
555 if (irq < 0)
556 return irq;
557
558 smp2p->mbox_client.dev = &pdev->dev;
559 smp2p->mbox_client.knows_txdone = true;
560 smp2p->mbox_chan = mbox_request_channel(&smp2p->mbox_client, 0);
561 if (IS_ERR(smp2p->mbox_chan)) {
562 if (PTR_ERR(smp2p->mbox_chan) != -ENODEV)
563 return PTR_ERR(smp2p->mbox_chan);
564
565 smp2p->mbox_chan = NULL;
566
567 ret = smp2p_parse_ipc(smp2p);
568 if (ret)
569 return ret;
570 }
571
572 ret = qcom_smp2p_alloc_outbound_item(smp2p);
573 if (ret < 0)
574 goto release_mbox;
575
576 for_each_available_child_of_node(pdev->dev.of_node, node) {
577 entry = devm_kzalloc(&pdev->dev, sizeof(*entry), GFP_KERNEL);
578 if (!entry) {
579 ret = -ENOMEM;
580 of_node_put(node);
581 goto unwind_interfaces;
582 }
583
584 entry->smp2p = smp2p;
585 spin_lock_init(&entry->lock);
586
587 ret = of_property_read_string(node, "qcom,entry-name", &entry->name);
588 if (ret < 0) {
589 of_node_put(node);
590 goto unwind_interfaces;
591 }
592
593 if (of_property_read_bool(node, "interrupt-controller")) {
594 ret = qcom_smp2p_inbound_entry(smp2p, entry, node);
595 if (ret < 0) {
596 of_node_put(node);
597 goto unwind_interfaces;
598 }
599
600 list_add(&entry->node, &smp2p->inbound);
601 } else {
602 ret = qcom_smp2p_outbound_entry(smp2p, entry, node);
603 if (ret < 0) {
604 of_node_put(node);
605 goto unwind_interfaces;
606 }
607
608 list_add(&entry->node, &smp2p->outbound);
609 }
610 }
611
612 /* Kick the outgoing edge after allocating entries */
613 qcom_smp2p_kick(smp2p);
614
615 ret = devm_request_threaded_irq(&pdev->dev, irq,
616 NULL, qcom_smp2p_intr,
617 IRQF_ONESHOT,
618 "smp2p", (void *)smp2p);
619 if (ret) {
620 dev_err(&pdev->dev, "failed to request interrupt\n");
621 goto unwind_interfaces;
622 }
623
624 /*
625 * Treat smp2p interrupt as wakeup source, but keep it disabled
626 * by default. User space can decide enabling it depending on its
627 * use cases. For example if remoteproc crashes and device wants
628 * to handle it immediatedly (e.g. to not miss phone calls) it can
629 * enable wakeup source from user space, while other devices which
630 * do not have proper autosleep feature may want to handle it with
631 * other wakeup events (e.g. Power button) instead waking up immediately.
632 */
633 device_set_wakeup_capable(&pdev->dev, true);
634
635 ret = dev_pm_set_wake_irq(&pdev->dev, irq);
636 if (ret)
637 goto set_wake_irq_fail;
638
639 return 0;
640
641 set_wake_irq_fail:
642 dev_pm_clear_wake_irq(&pdev->dev);
643
644 unwind_interfaces:
645 list_for_each_entry(entry, &smp2p->inbound, node)
646 irq_domain_remove(entry->domain);
647
648 list_for_each_entry(entry, &smp2p->outbound, node)
649 qcom_smem_state_unregister(entry->state);
650
651 smp2p->out->valid_entries = 0;
652
653 release_mbox:
654 mbox_free_channel(smp2p->mbox_chan);
655
656 return ret;
657
658 report_read_failure:
659 dev_err(&pdev->dev, "failed to read %s\n", key);
660 return -EINVAL;
661 }
662
qcom_smp2p_remove(struct platform_device * pdev)663 static int qcom_smp2p_remove(struct platform_device *pdev)
664 {
665 struct qcom_smp2p *smp2p = platform_get_drvdata(pdev);
666 struct smp2p_entry *entry;
667
668 dev_pm_clear_wake_irq(&pdev->dev);
669
670 list_for_each_entry(entry, &smp2p->inbound, node)
671 irq_domain_remove(entry->domain);
672
673 list_for_each_entry(entry, &smp2p->outbound, node)
674 qcom_smem_state_unregister(entry->state);
675
676 mbox_free_channel(smp2p->mbox_chan);
677
678 smp2p->out->valid_entries = 0;
679
680 return 0;
681 }
682
683 static const struct of_device_id qcom_smp2p_of_match[] = {
684 { .compatible = "qcom,smp2p" },
685 {}
686 };
687 MODULE_DEVICE_TABLE(of, qcom_smp2p_of_match);
688
689 static struct platform_driver qcom_smp2p_driver = {
690 .probe = qcom_smp2p_probe,
691 .remove = qcom_smp2p_remove,
692 .driver = {
693 .name = "qcom_smp2p",
694 .of_match_table = qcom_smp2p_of_match,
695 },
696 };
697 module_platform_driver(qcom_smp2p_driver);
698
699 MODULE_DESCRIPTION("Qualcomm Shared Memory Point to Point driver");
700 MODULE_LICENSE("GPL v2");
701
