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/seq_file.h>
20#include <linux/soc/qcom/smem.h>
21#include <linux/soc/qcom/smem_state.h>
22#include <linux/spinlock.h>
23
24/*
25 * The Shared Memory Point to Point (SMP2P) protocol facilitates communication
26 * of a single 32-bit value between two processors. Each value has a single
27 * writer (the local side) and a single reader (the remote side). Values are
28 * uniquely identified in the system by the directed edge (local processor ID
29 * to remote processor ID) and a string identifier.
30 *
31 * Each processor is responsible for creating the outgoing SMEM items and each
32 * item is writable by the local processor and readable by the remote
33 * processor. By using two separate SMEM items that are single-reader and
34 * single-writer, SMP2P does not require any remote locking mechanisms.
35 *
36 * The driver uses the Linux GPIO and interrupt framework to expose a virtual
37 * GPIO for each outbound entry and a virtual interrupt controller for each
38 * inbound entry.
39 */
40
41#define SMP2P_MAX_ENTRY 16
42#define SMP2P_MAX_ENTRY_NAME 16
43
44#define SMP2P_FEATURE_SSR_ACK 0x1
45#define SMP2P_FLAGS_RESTART_DONE_BIT 0
46#define SMP2P_FLAGS_RESTART_ACK_BIT 1
47
48#define SMP2P_MAGIC 0x504d5324
49#define SMP2P_ALL_FEATURES SMP2P_FEATURE_SSR_ACK
50
51/**
52 * struct smp2p_smem_item - in memory communication structure
53 * @magic: magic number
54 * @version: version - must be 1
55 * @features: features flag - currently unused
56 * @local_pid: processor id of sending end
57 * @remote_pid: processor id of receiving end
58 * @total_entries: number of entries - always SMP2P_MAX_ENTRY
59 * @valid_entries: number of allocated entries
60 * @flags:
61 * @entries: individual communication entries
62 * @entries.name: name of the entry
63 * @entries.value: content of the entry
64 */
65struct smp2p_smem_item {
66 u32 magic;
67 u8 version;
68 unsigned features:24;
69 u16 local_pid;
70 u16 remote_pid;
71 u16 total_entries;
72 u16 valid_entries;
73 u32 flags;
74
75 struct {
76 u8 name[SMP2P_MAX_ENTRY_NAME];
77 u32 value;
78 } entries[SMP2P_MAX_ENTRY];
79} __packed;
80
81/**
82 * struct smp2p_entry - driver context matching one entry
83 * @node: list entry to keep track of allocated entries
84 * @smp2p: reference to the device driver context
85 * @name: name of the entry, to match against smp2p_smem_item
86 * @value: pointer to smp2p_smem_item entry value
87 * @last_value: last handled value
88 * @domain: irq_domain for inbound entries
89 * @irq_enabled:bitmap to track enabled irq bits
90 * @irq_rising: bitmap to mark irq bits for rising detection
91 * @irq_falling:bitmap to mark irq bits for falling detection
92 * @state: smem state handle
93 * @lock: spinlock to protect read-modify-write of the value
94 */
95struct smp2p_entry {
96 struct list_head node;
97 struct qcom_smp2p *smp2p;
98
99 const char *name;
100 u32 *value;
101 u32 last_value;
102
103 struct irq_domain *domain;
104 DECLARE_BITMAP(irq_enabled, 32);
105 DECLARE_BITMAP(irq_rising, 32);
106 DECLARE_BITMAP(irq_falling, 32);
107
108 struct qcom_smem_state *state;
109
110 spinlock_t lock;
111};
112
113#define SMP2P_INBOUND 0
114#define SMP2P_OUTBOUND 1
115
116/**
117 * struct qcom_smp2p - device driver context
118 * @dev: device driver handle
119 * @in: pointer to the inbound smem item
120 * @out: pointer to the outbound smem item
121 * @smem_items: ids of the two smem items
122 * @valid_entries: already scanned inbound entries
123 * @ssr_ack_enabled: SMP2P_FEATURE_SSR_ACK feature is supported and was enabled
124 * @ssr_ack: current cached state of the local ack bit
125 * @negotiation_done: whether negotiating finished
126 * @local_pid: processor id of the inbound edge
127 * @remote_pid: processor id of the outbound edge
128 * @ipc_regmap: regmap for the outbound ipc
129 * @ipc_offset: offset within the regmap
130 * @ipc_bit: bit in regmap@offset to kick to signal remote processor
131 * @mbox_client: mailbox client handle
132 * @mbox_chan: apcs ipc mailbox channel handle
133 * @inbound: list of inbound entries
134 * @outbound: list of outbound entries
135 */
136struct qcom_smp2p {
137 struct device *dev;
138
139 struct smp2p_smem_item *in;
140 struct smp2p_smem_item *out;
141
142 unsigned smem_items[SMP2P_OUTBOUND + 1];
143
144 unsigned valid_entries;
145
146 bool ssr_ack_enabled;
147 bool ssr_ack;
148 bool negotiation_done;
149
150 unsigned local_pid;
151 unsigned remote_pid;
152
153 struct regmap *ipc_regmap;
154 int ipc_offset;
155 int ipc_bit;
156
157 struct mbox_client mbox_client;
158 struct mbox_chan *mbox_chan;
159
160 struct list_head inbound;
161 struct list_head outbound;
162};
163
164#define CREATE_TRACE_POINTS
165#include "trace-smp2p.h"
166
167static void qcom_smp2p_kick(struct qcom_smp2p *smp2p)
168{
169 /* Make sure any updated data is written before the kick */
170 wmb();
171
172 if (smp2p->mbox_chan) {
173 mbox_send_message(chan: smp2p->mbox_chan, NULL);
174 mbox_client_txdone(chan: smp2p->mbox_chan, r: 0);
175 } else {
176 regmap_write(map: smp2p->ipc_regmap, reg: smp2p->ipc_offset, BIT(smp2p->ipc_bit));
177 }
178}
179
180static bool qcom_smp2p_check_ssr(struct qcom_smp2p *smp2p)
181{
182 struct smp2p_smem_item *in = smp2p->in;
183 bool restart;
184
185 if (!smp2p->ssr_ack_enabled)
186 return false;
187
188 restart = in->flags & BIT(SMP2P_FLAGS_RESTART_DONE_BIT);
189
190 return restart != smp2p->ssr_ack;
191}
192
193static void qcom_smp2p_do_ssr_ack(struct qcom_smp2p *smp2p)
194{
195 struct smp2p_smem_item *out = smp2p->out;
196 u32 val;
197
198 trace_smp2p_ssr_ack(dev: smp2p->dev);
199 smp2p->ssr_ack = !smp2p->ssr_ack;
200
201 val = out->flags & ~BIT(SMP2P_FLAGS_RESTART_ACK_BIT);
202 if (smp2p->ssr_ack)
203 val |= BIT(SMP2P_FLAGS_RESTART_ACK_BIT);
204 out->flags = val;
205
206 qcom_smp2p_kick(smp2p);
207}
208
209static void qcom_smp2p_negotiate(struct qcom_smp2p *smp2p)
210{
211 struct smp2p_smem_item *out = smp2p->out;
212 struct smp2p_smem_item *in = smp2p->in;
213
214 if (in->version == out->version) {
215 out->features &= in->features;
216
217 if (out->features & SMP2P_FEATURE_SSR_ACK)
218 smp2p->ssr_ack_enabled = true;
219
220 smp2p->negotiation_done = true;
221 trace_smp2p_negotiate(dev: smp2p->dev, features: out->features);
222 }
223}
224
225static void qcom_smp2p_notify_in(struct qcom_smp2p *smp2p)
226{
227 struct smp2p_smem_item *in;
228 struct smp2p_entry *entry;
229 int irq_pin;
230 u32 status;
231 char buf[SMP2P_MAX_ENTRY_NAME];
232 u32 val;
233 int i;
234
235 in = smp2p->in;
236
237 /* Match newly created entries */
238 for (i = smp2p->valid_entries; i < in->valid_entries; i++) {
239 list_for_each_entry(entry, &smp2p->inbound, node) {
240 memcpy(buf, in->entries[i].name, sizeof(buf));
241 if (!strcmp(buf, entry->name)) {
242 entry->value = &in->entries[i].value;
243 break;
244 }
245 }
246 }
247 smp2p->valid_entries = i;
248
249 /* Fire interrupts based on any value changes */
250 list_for_each_entry(entry, &smp2p->inbound, node) {
251 /* Ignore entries not yet allocated by the remote side */
252 if (!entry->value)
253 continue;
254
255 val = readl(addr: entry->value);
256
257 status = val ^ entry->last_value;
258 entry->last_value = val;
259
260 trace_smp2p_notify_in(smp2p_entry: entry, status, val);
261
262 /* No changes of this entry? */
263 if (!status)
264 continue;
265
266 for_each_set_bit(i, entry->irq_enabled, 32) {
267 if (!(status & BIT(i)))
268 continue;
269
270 if ((val & BIT(i) && test_bit(i, entry->irq_rising)) ||
271 (!(val & BIT(i)) && test_bit(i, entry->irq_falling))) {
272 irq_pin = irq_find_mapping(domain: entry->domain, hwirq: i);
273 handle_nested_irq(irq: irq_pin);
274 }
275 }
276 }
277}
278
279/**
280 * qcom_smp2p_intr() - interrupt handler for incoming notifications
281 * @irq: unused
282 * @data: smp2p driver context
283 *
284 * Handle notifications from the remote side to handle newly allocated entries
285 * or any changes to the state bits of existing entries.
286 *
287 * Return: %IRQ_HANDLED
288 */
289static irqreturn_t qcom_smp2p_intr(int irq, void *data)
290{
291 struct smp2p_smem_item *in;
292 struct qcom_smp2p *smp2p = data;
293 unsigned int smem_id = smp2p->smem_items[SMP2P_INBOUND];
294 unsigned int pid = smp2p->remote_pid;
295 bool ack_restart;
296 size_t size;
297
298 in = smp2p->in;
299
300 /* Acquire smem item, if not already found */
301 if (!in) {
302 in = qcom_smem_get(host: pid, item: smem_id, size: &size);
303 if (IS_ERR(ptr: in)) {
304 dev_err(smp2p->dev,
305 "Unable to acquire remote smp2p item\n");
306 goto out;
307 }
308
309 smp2p->in = in;
310 }
311
312 if (!smp2p->negotiation_done)
313 qcom_smp2p_negotiate(smp2p);
314
315 if (smp2p->negotiation_done) {
316 ack_restart = qcom_smp2p_check_ssr(smp2p);
317 qcom_smp2p_notify_in(smp2p);
318
319 if (ack_restart)
320 qcom_smp2p_do_ssr_ack(smp2p);
321 }
322
323out:
324 return IRQ_HANDLED;
325}
326
327static void smp2p_mask_irq(struct irq_data *irqd)
328{
329 struct smp2p_entry *entry = irq_data_get_irq_chip_data(d: irqd);
330 irq_hw_number_t irq = irqd_to_hwirq(d: irqd);
331
332 clear_bit(nr: irq, addr: entry->irq_enabled);
333}
334
335static void smp2p_unmask_irq(struct irq_data *irqd)
336{
337 struct smp2p_entry *entry = irq_data_get_irq_chip_data(d: irqd);
338 irq_hw_number_t irq = irqd_to_hwirq(d: irqd);
339
340 set_bit(nr: irq, addr: entry->irq_enabled);
341}
342
343static int smp2p_set_irq_type(struct irq_data *irqd, unsigned int type)
344{
345 struct smp2p_entry *entry = irq_data_get_irq_chip_data(d: irqd);
346 irq_hw_number_t irq = irqd_to_hwirq(d: irqd);
347
348 if (!(type & IRQ_TYPE_EDGE_BOTH))
349 return -EINVAL;
350
351 if (type & IRQ_TYPE_EDGE_RISING)
352 set_bit(nr: irq, addr: entry->irq_rising);
353 else
354 clear_bit(nr: irq, addr: entry->irq_rising);
355
356 if (type & IRQ_TYPE_EDGE_FALLING)
357 set_bit(nr: irq, addr: entry->irq_falling);
358 else
359 clear_bit(nr: irq, addr: entry->irq_falling);
360
361 return 0;
362}
363
364static void smp2p_irq_print_chip(struct irq_data *irqd, struct seq_file *p)
365{
366 struct smp2p_entry *entry = irq_data_get_irq_chip_data(d: irqd);
367
368 seq_printf(m: p, fmt: "%8s", dev_name(dev: entry->smp2p->dev));
369}
370
371static struct irq_chip smp2p_irq_chip = {
372 .name = "smp2p",
373 .irq_mask = smp2p_mask_irq,
374 .irq_unmask = smp2p_unmask_irq,
375 .irq_set_type = smp2p_set_irq_type,
376 .irq_print_chip = smp2p_irq_print_chip,
377};
378
379static int smp2p_irq_map(struct irq_domain *d,
380 unsigned int irq,
381 irq_hw_number_t hw)
382{
383 struct smp2p_entry *entry = d->host_data;
384
385 irq_set_chip_and_handler(irq, chip: &smp2p_irq_chip, handle: handle_level_irq);
386 irq_set_chip_data(irq, data: entry);
387 irq_set_nested_thread(irq, nest: 1);
388 irq_set_noprobe(irq);
389
390 return 0;
391}
392
393static const struct irq_domain_ops smp2p_irq_ops = {
394 .map = smp2p_irq_map,
395 .xlate = irq_domain_xlate_twocell,
396};
397
398static int qcom_smp2p_inbound_entry(struct qcom_smp2p *smp2p,
399 struct smp2p_entry *entry,
400 struct device_node *node)
401{
402 entry->domain = irq_domain_create_linear(of_fwnode_handle(node), size: 32, ops: &smp2p_irq_ops, host_data: entry);
403 if (!entry->domain) {
404 dev_err(smp2p->dev, "failed to add irq_domain\n");
405 return -ENOMEM;
406 }
407
408 return 0;
409}
410
411static int smp2p_update_bits(void *data, u32 mask, u32 value)
412{
413 struct smp2p_entry *entry = data;
414 unsigned long flags;
415 u32 orig;
416 u32 val;
417
418 spin_lock_irqsave(&entry->lock, flags);
419 val = orig = readl(addr: entry->value);
420 val &= ~mask;
421 val |= value;
422 writel(val, addr: entry->value);
423 spin_unlock_irqrestore(lock: &entry->lock, flags);
424
425 trace_smp2p_update_bits(smp2p_entry: entry, orig, val);
426
427 if (val != orig)
428 qcom_smp2p_kick(smp2p: entry->smp2p);
429
430 return 0;
431}
432
433static const struct qcom_smem_state_ops smp2p_state_ops = {
434 .update_bits = smp2p_update_bits,
435};
436
437static int qcom_smp2p_outbound_entry(struct qcom_smp2p *smp2p,
438 struct smp2p_entry *entry,
439 struct device_node *node)
440{
441 struct smp2p_smem_item *out = smp2p->out;
442 char buf[SMP2P_MAX_ENTRY_NAME] = {};
443
444 /* Allocate an entry from the smem item */
445 strscpy(buf, entry->name, SMP2P_MAX_ENTRY_NAME);
446 memcpy(out->entries[out->valid_entries].name, buf, SMP2P_MAX_ENTRY_NAME);
447
448 /* Make the logical entry reference the physical value */
449 entry->value = &out->entries[out->valid_entries].value;
450
451 out->valid_entries++;
452
453 entry->state = qcom_smem_state_register(of_node: node, ops: &smp2p_state_ops, data: entry);
454 if (IS_ERR(ptr: entry->state)) {
455 dev_err(smp2p->dev, "failed to register qcom_smem_state\n");
456 return PTR_ERR(ptr: entry->state);
457 }
458
459 return 0;
460}
461
462static int qcom_smp2p_alloc_outbound_item(struct qcom_smp2p *smp2p)
463{
464 struct smp2p_smem_item *out;
465 unsigned smem_id = smp2p->smem_items[SMP2P_OUTBOUND];
466 unsigned pid = smp2p->remote_pid;
467 int ret;
468
469 ret = qcom_smem_alloc(host: pid, item: smem_id, size: sizeof(*out));
470 if (ret < 0 && ret != -EEXIST)
471 return dev_err_probe(dev: smp2p->dev, err: ret,
472 fmt: "unable to allocate local smp2p item\n");
473
474 out = qcom_smem_get(host: pid, item: smem_id, NULL);
475 if (IS_ERR(ptr: out)) {
476 dev_err(smp2p->dev, "Unable to acquire local smp2p item\n");
477 return PTR_ERR(ptr: out);
478 }
479
480 memset(out, 0, sizeof(*out));
481 out->magic = SMP2P_MAGIC;
482 out->local_pid = smp2p->local_pid;
483 out->remote_pid = smp2p->remote_pid;
484 out->total_entries = SMP2P_MAX_ENTRY;
485 out->valid_entries = 0;
486 out->features = SMP2P_ALL_FEATURES;
487
488 /*
489 * Make sure the rest of the header is written before we validate the
490 * item by writing a valid version number.
491 */
492 wmb();
493 out->version = 1;
494
495 qcom_smp2p_kick(smp2p);
496
497 smp2p->out = out;
498
499 return 0;
500}
501
502static int smp2p_parse_ipc(struct qcom_smp2p *smp2p)
503{
504 struct device_node *syscon;
505 struct device *dev = smp2p->dev;
506 const char *key;
507 int ret;
508
509 syscon = of_parse_phandle(np: dev->of_node, phandle_name: "qcom,ipc", index: 0);
510 if (!syscon) {
511 dev_err(dev, "no qcom,ipc node\n");
512 return -ENODEV;
513 }
514
515 smp2p->ipc_regmap = syscon_node_to_regmap(np: syscon);
516 of_node_put(node: syscon);
517 if (IS_ERR(ptr: smp2p->ipc_regmap))
518 return PTR_ERR(ptr: smp2p->ipc_regmap);
519
520 key = "qcom,ipc";
521 ret = of_property_read_u32_index(np: dev->of_node, propname: key, index: 1, out_value: &smp2p->ipc_offset);
522 if (ret < 0) {
523 dev_err(dev, "no offset in %s\n", key);
524 return -EINVAL;
525 }
526
527 ret = of_property_read_u32_index(np: dev->of_node, propname: key, index: 2, out_value: &smp2p->ipc_bit);
528 if (ret < 0) {
529 dev_err(dev, "no bit in %s\n", key);
530 return -EINVAL;
531 }
532
533 return 0;
534}
535
536static int qcom_smp2p_probe(struct platform_device *pdev)
537{
538 struct smp2p_entry *entry;
539 struct qcom_smp2p *smp2p;
540 const char *key;
541 int irq;
542 int ret;
543
544 smp2p = devm_kzalloc(dev: &pdev->dev, size: sizeof(*smp2p), GFP_KERNEL);
545 if (!smp2p)
546 return -ENOMEM;
547
548 smp2p->dev = &pdev->dev;
549 INIT_LIST_HEAD(list: &smp2p->inbound);
550 INIT_LIST_HEAD(list: &smp2p->outbound);
551
552 platform_set_drvdata(pdev, data: smp2p);
553
554 key = "qcom,smem";
555 ret = of_property_read_u32_array(np: pdev->dev.of_node, propname: key,
556 out_values: smp2p->smem_items, sz: 2);
557 if (ret)
558 return ret;
559
560 key = "qcom,local-pid";
561 ret = of_property_read_u32(np: pdev->dev.of_node, propname: key, out_value: &smp2p->local_pid);
562 if (ret)
563 goto report_read_failure;
564
565 key = "qcom,remote-pid";
566 ret = of_property_read_u32(np: pdev->dev.of_node, propname: key, out_value: &smp2p->remote_pid);
567 if (ret)
568 goto report_read_failure;
569
570 irq = platform_get_irq(pdev, 0);
571 if (irq < 0)
572 return irq;
573
574 smp2p->mbox_client.dev = &pdev->dev;
575 smp2p->mbox_client.knows_txdone = true;
576 smp2p->mbox_chan = mbox_request_channel(cl: &smp2p->mbox_client, index: 0);
577 if (IS_ERR(ptr: smp2p->mbox_chan)) {
578 if (PTR_ERR(ptr: smp2p->mbox_chan) != -ENOENT)
579 return PTR_ERR(ptr: smp2p->mbox_chan);
580
581 smp2p->mbox_chan = NULL;
582
583 ret = smp2p_parse_ipc(smp2p);
584 if (ret)
585 return ret;
586 }
587
588 ret = qcom_smp2p_alloc_outbound_item(smp2p);
589 if (ret < 0)
590 goto release_mbox;
591
592 for_each_available_child_of_node_scoped(pdev->dev.of_node, node) {
593 entry = devm_kzalloc(dev: &pdev->dev, size: sizeof(*entry), GFP_KERNEL);
594 if (!entry) {
595 ret = -ENOMEM;
596 goto unwind_interfaces;
597 }
598
599 entry->smp2p = smp2p;
600 spin_lock_init(&entry->lock);
601
602 ret = of_property_read_string(np: node, propname: "qcom,entry-name", out_string: &entry->name);
603 if (ret < 0)
604 goto unwind_interfaces;
605
606 if (of_property_read_bool(np: node, propname: "interrupt-controller")) {
607 ret = qcom_smp2p_inbound_entry(smp2p, entry, node);
608 if (ret < 0)
609 goto unwind_interfaces;
610
611 list_add(new: &entry->node, head: &smp2p->inbound);
612 } else {
613 ret = qcom_smp2p_outbound_entry(smp2p, entry, node);
614 if (ret < 0)
615 goto unwind_interfaces;
616
617 list_add(new: &entry->node, head: &smp2p->outbound);
618 }
619 }
620
621 /* Kick the outgoing edge after allocating entries */
622 qcom_smp2p_kick(smp2p);
623
624 ret = devm_request_threaded_irq(dev: &pdev->dev, irq,
625 NULL, thread_fn: qcom_smp2p_intr,
626 IRQF_ONESHOT,
627 NULL, dev_id: (void *)smp2p);
628 if (ret) {
629 dev_err(&pdev->dev, "failed to request interrupt\n");
630 goto unwind_interfaces;
631 }
632
633 /*
634 * Treat smp2p interrupt as wakeup source, but keep it disabled
635 * by default. User space can decide enabling it depending on its
636 * use cases. For example if remoteproc crashes and device wants
637 * to handle it immediatedly (e.g. to not miss phone calls) it can
638 * enable wakeup source from user space, while other devices which
639 * do not have proper autosleep feature may want to handle it with
640 * other wakeup events (e.g. Power button) instead waking up immediately.
641 */
642 device_set_wakeup_capable(dev: &pdev->dev, capable: true);
643
644 ret = dev_pm_set_wake_irq(dev: &pdev->dev, irq);
645 if (ret)
646 goto set_wake_irq_fail;
647
648 return 0;
649
650set_wake_irq_fail:
651 dev_pm_clear_wake_irq(dev: &pdev->dev);
652
653unwind_interfaces:
654 list_for_each_entry(entry, &smp2p->inbound, node)
655 irq_domain_remove(domain: entry->domain);
656
657 list_for_each_entry(entry, &smp2p->outbound, node)
658 qcom_smem_state_unregister(state: entry->state);
659
660 smp2p->out->valid_entries = 0;
661
662release_mbox:
663 mbox_free_channel(chan: smp2p->mbox_chan);
664
665 return ret;
666
667report_read_failure:
668 dev_err(&pdev->dev, "failed to read %s\n", key);
669 return -EINVAL;
670}
671
672static void qcom_smp2p_remove(struct platform_device *pdev)
673{
674 struct qcom_smp2p *smp2p = platform_get_drvdata(pdev);
675 struct smp2p_entry *entry;
676
677 dev_pm_clear_wake_irq(dev: &pdev->dev);
678
679 list_for_each_entry(entry, &smp2p->inbound, node)
680 irq_domain_remove(domain: entry->domain);
681
682 list_for_each_entry(entry, &smp2p->outbound, node)
683 qcom_smem_state_unregister(state: entry->state);
684
685 mbox_free_channel(chan: smp2p->mbox_chan);
686
687 smp2p->out->valid_entries = 0;
688}
689
690static const struct of_device_id qcom_smp2p_of_match[] = {
691 { .compatible = "qcom,smp2p" },
692 {}
693};
694MODULE_DEVICE_TABLE(of, qcom_smp2p_of_match);
695
696static struct platform_driver qcom_smp2p_driver = {
697 .probe = qcom_smp2p_probe,
698 .remove = qcom_smp2p_remove,
699 .driver = {
700 .name = "qcom_smp2p",
701 .of_match_table = qcom_smp2p_of_match,
702 },
703};
704module_platform_driver(qcom_smp2p_driver);
705
706MODULE_DESCRIPTION("Qualcomm Shared Memory Point to Point driver");
707MODULE_LICENSE("GPL v2");
708

source code of linux/drivers/soc/qcom/smp2p.c