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 | * @entries.name: name of the entry |
62 | * @entries.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 | |
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(chan: smp2p->mbox_chan, NULL); |
170 | mbox_client_txdone(chan: smp2p->mbox_chan, r: 0); |
171 | } else { |
172 | regmap_write(map: smp2p->ipc_regmap, reg: smp2p->ipc_offset, BIT(smp2p->ipc_bit)); |
173 | } |
174 | } |
175 | |
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 | |
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 | |
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 | |
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(addr: 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(domain: entry->domain, hwirq: i); |
265 | handle_nested_irq(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 | * |
279 | * Return: %IRQ_HANDLED |
280 | */ |
281 | static irqreturn_t qcom_smp2p_intr(int irq, void *data) |
282 | { |
283 | struct smp2p_smem_item *in; |
284 | struct qcom_smp2p *smp2p = data; |
285 | unsigned int smem_id = smp2p->smem_items[SMP2P_INBOUND]; |
286 | unsigned int pid = smp2p->remote_pid; |
287 | bool ack_restart; |
288 | size_t size; |
289 | |
290 | in = smp2p->in; |
291 | |
292 | /* Acquire smem item, if not already found */ |
293 | if (!in) { |
294 | in = qcom_smem_get(host: pid, item: smem_id, size: &size); |
295 | if (IS_ERR(ptr: in)) { |
296 | dev_err(smp2p->dev, |
297 | "Unable to acquire remote smp2p item\n" ); |
298 | goto out; |
299 | } |
300 | |
301 | smp2p->in = in; |
302 | } |
303 | |
304 | if (!smp2p->negotiation_done) |
305 | qcom_smp2p_negotiate(smp2p); |
306 | |
307 | if (smp2p->negotiation_done) { |
308 | ack_restart = qcom_smp2p_check_ssr(smp2p); |
309 | qcom_smp2p_notify_in(smp2p); |
310 | |
311 | if (ack_restart) |
312 | qcom_smp2p_do_ssr_ack(smp2p); |
313 | } |
314 | |
315 | out: |
316 | return IRQ_HANDLED; |
317 | } |
318 | |
319 | static void smp2p_mask_irq(struct irq_data *irqd) |
320 | { |
321 | struct smp2p_entry *entry = irq_data_get_irq_chip_data(d: irqd); |
322 | irq_hw_number_t irq = irqd_to_hwirq(d: irqd); |
323 | |
324 | clear_bit(nr: irq, addr: entry->irq_enabled); |
325 | } |
326 | |
327 | static void smp2p_unmask_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 | set_bit(nr: irq, addr: entry->irq_enabled); |
333 | } |
334 | |
335 | static int smp2p_set_irq_type(struct irq_data *irqd, unsigned int type) |
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 | if (!(type & IRQ_TYPE_EDGE_BOTH)) |
341 | return -EINVAL; |
342 | |
343 | if (type & IRQ_TYPE_EDGE_RISING) |
344 | set_bit(nr: irq, addr: entry->irq_rising); |
345 | else |
346 | clear_bit(nr: irq, addr: entry->irq_rising); |
347 | |
348 | if (type & IRQ_TYPE_EDGE_FALLING) |
349 | set_bit(nr: irq, addr: entry->irq_falling); |
350 | else |
351 | clear_bit(nr: irq, addr: entry->irq_falling); |
352 | |
353 | return 0; |
354 | } |
355 | |
356 | static struct irq_chip smp2p_irq_chip = { |
357 | .name = "smp2p" , |
358 | .irq_mask = smp2p_mask_irq, |
359 | .irq_unmask = smp2p_unmask_irq, |
360 | .irq_set_type = smp2p_set_irq_type, |
361 | }; |
362 | |
363 | static int smp2p_irq_map(struct irq_domain *d, |
364 | unsigned int irq, |
365 | irq_hw_number_t hw) |
366 | { |
367 | struct smp2p_entry *entry = d->host_data; |
368 | |
369 | irq_set_chip_and_handler(irq, chip: &smp2p_irq_chip, handle: handle_level_irq); |
370 | irq_set_chip_data(irq, data: entry); |
371 | irq_set_nested_thread(irq, nest: 1); |
372 | irq_set_noprobe(irq); |
373 | |
374 | return 0; |
375 | } |
376 | |
377 | static const struct irq_domain_ops smp2p_irq_ops = { |
378 | .map = smp2p_irq_map, |
379 | .xlate = irq_domain_xlate_twocell, |
380 | }; |
381 | |
382 | static int qcom_smp2p_inbound_entry(struct qcom_smp2p *smp2p, |
383 | struct smp2p_entry *entry, |
384 | struct device_node *node) |
385 | { |
386 | entry->domain = irq_domain_add_linear(of_node: node, size: 32, ops: &smp2p_irq_ops, host_data: entry); |
387 | if (!entry->domain) { |
388 | dev_err(smp2p->dev, "failed to add irq_domain\n" ); |
389 | return -ENOMEM; |
390 | } |
391 | |
392 | return 0; |
393 | } |
394 | |
395 | static int smp2p_update_bits(void *data, u32 mask, u32 value) |
396 | { |
397 | struct smp2p_entry *entry = data; |
398 | unsigned long flags; |
399 | u32 orig; |
400 | u32 val; |
401 | |
402 | spin_lock_irqsave(&entry->lock, flags); |
403 | val = orig = readl(addr: entry->value); |
404 | val &= ~mask; |
405 | val |= value; |
406 | writel(val, addr: entry->value); |
407 | spin_unlock_irqrestore(lock: &entry->lock, flags); |
408 | |
409 | if (val != orig) |
410 | qcom_smp2p_kick(smp2p: entry->smp2p); |
411 | |
412 | return 0; |
413 | } |
414 | |
415 | static const struct qcom_smem_state_ops smp2p_state_ops = { |
416 | .update_bits = smp2p_update_bits, |
417 | }; |
418 | |
419 | static int qcom_smp2p_outbound_entry(struct qcom_smp2p *smp2p, |
420 | struct smp2p_entry *entry, |
421 | struct device_node *node) |
422 | { |
423 | struct smp2p_smem_item *out = smp2p->out; |
424 | char buf[SMP2P_MAX_ENTRY_NAME] = {}; |
425 | |
426 | /* Allocate an entry from the smem item */ |
427 | strscpy(buf, entry->name, SMP2P_MAX_ENTRY_NAME); |
428 | memcpy(out->entries[out->valid_entries].name, buf, SMP2P_MAX_ENTRY_NAME); |
429 | |
430 | /* Make the logical entry reference the physical value */ |
431 | entry->value = &out->entries[out->valid_entries].value; |
432 | |
433 | out->valid_entries++; |
434 | |
435 | entry->state = qcom_smem_state_register(of_node: node, ops: &smp2p_state_ops, data: entry); |
436 | if (IS_ERR(ptr: entry->state)) { |
437 | dev_err(smp2p->dev, "failed to register qcom_smem_state\n" ); |
438 | return PTR_ERR(ptr: entry->state); |
439 | } |
440 | |
441 | return 0; |
442 | } |
443 | |
444 | static int qcom_smp2p_alloc_outbound_item(struct qcom_smp2p *smp2p) |
445 | { |
446 | struct smp2p_smem_item *out; |
447 | unsigned smem_id = smp2p->smem_items[SMP2P_OUTBOUND]; |
448 | unsigned pid = smp2p->remote_pid; |
449 | int ret; |
450 | |
451 | ret = qcom_smem_alloc(host: pid, item: smem_id, size: sizeof(*out)); |
452 | if (ret < 0 && ret != -EEXIST) { |
453 | if (ret != -EPROBE_DEFER) |
454 | dev_err(smp2p->dev, |
455 | "unable to allocate local smp2p item\n" ); |
456 | return ret; |
457 | } |
458 | |
459 | out = qcom_smem_get(host: pid, item: smem_id, NULL); |
460 | if (IS_ERR(ptr: out)) { |
461 | dev_err(smp2p->dev, "Unable to acquire local smp2p item\n" ); |
462 | return PTR_ERR(ptr: out); |
463 | } |
464 | |
465 | memset(out, 0, sizeof(*out)); |
466 | out->magic = SMP2P_MAGIC; |
467 | out->local_pid = smp2p->local_pid; |
468 | out->remote_pid = smp2p->remote_pid; |
469 | out->total_entries = SMP2P_MAX_ENTRY; |
470 | out->valid_entries = 0; |
471 | out->features = SMP2P_ALL_FEATURES; |
472 | |
473 | /* |
474 | * Make sure the rest of the header is written before we validate the |
475 | * item by writing a valid version number. |
476 | */ |
477 | wmb(); |
478 | out->version = 1; |
479 | |
480 | qcom_smp2p_kick(smp2p); |
481 | |
482 | smp2p->out = out; |
483 | |
484 | return 0; |
485 | } |
486 | |
487 | static int smp2p_parse_ipc(struct qcom_smp2p *smp2p) |
488 | { |
489 | struct device_node *syscon; |
490 | struct device *dev = smp2p->dev; |
491 | const char *key; |
492 | int ret; |
493 | |
494 | syscon = of_parse_phandle(np: dev->of_node, phandle_name: "qcom,ipc" , index: 0); |
495 | if (!syscon) { |
496 | dev_err(dev, "no qcom,ipc node\n" ); |
497 | return -ENODEV; |
498 | } |
499 | |
500 | smp2p->ipc_regmap = syscon_node_to_regmap(np: syscon); |
501 | of_node_put(node: syscon); |
502 | if (IS_ERR(ptr: smp2p->ipc_regmap)) |
503 | return PTR_ERR(ptr: smp2p->ipc_regmap); |
504 | |
505 | key = "qcom,ipc" ; |
506 | ret = of_property_read_u32_index(np: dev->of_node, propname: key, index: 1, out_value: &smp2p->ipc_offset); |
507 | if (ret < 0) { |
508 | dev_err(dev, "no offset in %s\n" , key); |
509 | return -EINVAL; |
510 | } |
511 | |
512 | ret = of_property_read_u32_index(np: dev->of_node, propname: key, index: 2, out_value: &smp2p->ipc_bit); |
513 | if (ret < 0) { |
514 | dev_err(dev, "no bit in %s\n" , key); |
515 | return -EINVAL; |
516 | } |
517 | |
518 | return 0; |
519 | } |
520 | |
521 | static int qcom_smp2p_probe(struct platform_device *pdev) |
522 | { |
523 | struct smp2p_entry *entry; |
524 | struct device_node *node; |
525 | struct qcom_smp2p *smp2p; |
526 | const char *key; |
527 | int irq; |
528 | int ret; |
529 | |
530 | smp2p = devm_kzalloc(dev: &pdev->dev, size: sizeof(*smp2p), GFP_KERNEL); |
531 | if (!smp2p) |
532 | return -ENOMEM; |
533 | |
534 | smp2p->dev = &pdev->dev; |
535 | INIT_LIST_HEAD(list: &smp2p->inbound); |
536 | INIT_LIST_HEAD(list: &smp2p->outbound); |
537 | |
538 | platform_set_drvdata(pdev, data: smp2p); |
539 | |
540 | key = "qcom,smem" ; |
541 | ret = of_property_read_u32_array(np: pdev->dev.of_node, propname: key, |
542 | out_values: smp2p->smem_items, sz: 2); |
543 | if (ret) |
544 | return ret; |
545 | |
546 | key = "qcom,local-pid" ; |
547 | ret = of_property_read_u32(np: pdev->dev.of_node, propname: key, out_value: &smp2p->local_pid); |
548 | if (ret) |
549 | goto report_read_failure; |
550 | |
551 | key = "qcom,remote-pid" ; |
552 | ret = of_property_read_u32(np: pdev->dev.of_node, propname: key, out_value: &smp2p->remote_pid); |
553 | if (ret) |
554 | goto report_read_failure; |
555 | |
556 | irq = platform_get_irq(pdev, 0); |
557 | if (irq < 0) |
558 | return irq; |
559 | |
560 | smp2p->mbox_client.dev = &pdev->dev; |
561 | smp2p->mbox_client.knows_txdone = true; |
562 | smp2p->mbox_chan = mbox_request_channel(cl: &smp2p->mbox_client, index: 0); |
563 | if (IS_ERR(ptr: smp2p->mbox_chan)) { |
564 | if (PTR_ERR(ptr: smp2p->mbox_chan) != -ENODEV) |
565 | return PTR_ERR(ptr: smp2p->mbox_chan); |
566 | |
567 | smp2p->mbox_chan = NULL; |
568 | |
569 | ret = smp2p_parse_ipc(smp2p); |
570 | if (ret) |
571 | return ret; |
572 | } |
573 | |
574 | ret = qcom_smp2p_alloc_outbound_item(smp2p); |
575 | if (ret < 0) |
576 | goto release_mbox; |
577 | |
578 | for_each_available_child_of_node(pdev->dev.of_node, node) { |
579 | entry = devm_kzalloc(dev: &pdev->dev, size: sizeof(*entry), GFP_KERNEL); |
580 | if (!entry) { |
581 | ret = -ENOMEM; |
582 | of_node_put(node); |
583 | goto unwind_interfaces; |
584 | } |
585 | |
586 | entry->smp2p = smp2p; |
587 | spin_lock_init(&entry->lock); |
588 | |
589 | ret = of_property_read_string(np: node, propname: "qcom,entry-name" , out_string: &entry->name); |
590 | if (ret < 0) { |
591 | of_node_put(node); |
592 | goto unwind_interfaces; |
593 | } |
594 | |
595 | if (of_property_read_bool(np: node, propname: "interrupt-controller" )) { |
596 | ret = qcom_smp2p_inbound_entry(smp2p, entry, node); |
597 | if (ret < 0) { |
598 | of_node_put(node); |
599 | goto unwind_interfaces; |
600 | } |
601 | |
602 | list_add(new: &entry->node, head: &smp2p->inbound); |
603 | } else { |
604 | ret = qcom_smp2p_outbound_entry(smp2p, entry, node); |
605 | if (ret < 0) { |
606 | of_node_put(node); |
607 | goto unwind_interfaces; |
608 | } |
609 | |
610 | list_add(new: &entry->node, head: &smp2p->outbound); |
611 | } |
612 | } |
613 | |
614 | /* Kick the outgoing edge after allocating entries */ |
615 | qcom_smp2p_kick(smp2p); |
616 | |
617 | ret = devm_request_threaded_irq(dev: &pdev->dev, irq, |
618 | NULL, thread_fn: qcom_smp2p_intr, |
619 | IRQF_ONESHOT, |
620 | devname: "smp2p" , dev_id: (void *)smp2p); |
621 | if (ret) { |
622 | dev_err(&pdev->dev, "failed to request interrupt\n" ); |
623 | goto unwind_interfaces; |
624 | } |
625 | |
626 | /* |
627 | * Treat smp2p interrupt as wakeup source, but keep it disabled |
628 | * by default. User space can decide enabling it depending on its |
629 | * use cases. For example if remoteproc crashes and device wants |
630 | * to handle it immediatedly (e.g. to not miss phone calls) it can |
631 | * enable wakeup source from user space, while other devices which |
632 | * do not have proper autosleep feature may want to handle it with |
633 | * other wakeup events (e.g. Power button) instead waking up immediately. |
634 | */ |
635 | device_set_wakeup_capable(dev: &pdev->dev, capable: true); |
636 | |
637 | ret = dev_pm_set_wake_irq(dev: &pdev->dev, irq); |
638 | if (ret) |
639 | goto set_wake_irq_fail; |
640 | |
641 | return 0; |
642 | |
643 | set_wake_irq_fail: |
644 | dev_pm_clear_wake_irq(dev: &pdev->dev); |
645 | |
646 | unwind_interfaces: |
647 | list_for_each_entry(entry, &smp2p->inbound, node) |
648 | irq_domain_remove(host: entry->domain); |
649 | |
650 | list_for_each_entry(entry, &smp2p->outbound, node) |
651 | qcom_smem_state_unregister(state: entry->state); |
652 | |
653 | smp2p->out->valid_entries = 0; |
654 | |
655 | release_mbox: |
656 | mbox_free_channel(chan: smp2p->mbox_chan); |
657 | |
658 | return ret; |
659 | |
660 | report_read_failure: |
661 | dev_err(&pdev->dev, "failed to read %s\n" , key); |
662 | return -EINVAL; |
663 | } |
664 | |
665 | static void qcom_smp2p_remove(struct platform_device *pdev) |
666 | { |
667 | struct qcom_smp2p *smp2p = platform_get_drvdata(pdev); |
668 | struct smp2p_entry *entry; |
669 | |
670 | dev_pm_clear_wake_irq(dev: &pdev->dev); |
671 | |
672 | list_for_each_entry(entry, &smp2p->inbound, node) |
673 | irq_domain_remove(host: entry->domain); |
674 | |
675 | list_for_each_entry(entry, &smp2p->outbound, node) |
676 | qcom_smem_state_unregister(state: entry->state); |
677 | |
678 | mbox_free_channel(chan: smp2p->mbox_chan); |
679 | |
680 | smp2p->out->valid_entries = 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_new = 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 | |