1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * Copyright (C) STMicroelectronics 2018 - All Rights Reserved
4  * Authors: Ludovic Barre <ludovic.barre@st.com> for STMicroelectronics.
5  *          Fabien Dessenne <fabien.dessenne@st.com> for STMicroelectronics.
6  */
7 
8 #include <linux/arm-smccc.h>
9 #include <linux/dma-mapping.h>
10 #include <linux/interrupt.h>
11 #include <linux/io.h>
12 #include <linux/mailbox_client.h>
13 #include <linux/mfd/syscon.h>
14 #include <linux/module.h>
15 #include <linux/of_address.h>
16 #include <linux/of_device.h>
17 #include <linux/of_reserved_mem.h>
18 #include <linux/pm_wakeirq.h>
19 #include <linux/regmap.h>
20 #include <linux/remoteproc.h>
21 #include <linux/reset.h>
22 #include <linux/workqueue.h>
23 
24 #include "remoteproc_internal.h"
25 
26 #define HOLD_BOOT		0
27 #define RELEASE_BOOT		1
28 
29 #define MBOX_NB_VQ		2
30 #define MBOX_NB_MBX		3
31 
32 #define STM32_SMC_RCC		0x82001000
33 #define STM32_SMC_REG_WRITE	0x1
34 
35 #define STM32_MBX_VQ0		"vq0"
36 #define STM32_MBX_VQ0_ID	0
37 #define STM32_MBX_VQ1		"vq1"
38 #define STM32_MBX_VQ1_ID	1
39 #define STM32_MBX_SHUTDOWN	"shutdown"
40 
41 struct stm32_syscon {
42 	struct regmap *map;
43 	u32 reg;
44 	u32 mask;
45 };
46 
47 struct stm32_rproc_mem {
48 	char name[20];
49 	void __iomem *cpu_addr;
50 	phys_addr_t bus_addr;
51 	u32 dev_addr;
52 	size_t size;
53 };
54 
55 struct stm32_rproc_mem_ranges {
56 	u32 dev_addr;
57 	u32 bus_addr;
58 	u32 size;
59 };
60 
61 struct stm32_mbox {
62 	const unsigned char name[10];
63 	struct mbox_chan *chan;
64 	struct mbox_client client;
65 	struct work_struct vq_work;
66 	int vq_id;
67 };
68 
69 struct stm32_rproc {
70 	struct reset_control *rst;
71 	struct stm32_syscon hold_boot;
72 	struct stm32_syscon pdds;
73 	int wdg_irq;
74 	u32 nb_rmems;
75 	struct stm32_rproc_mem *rmems;
76 	struct stm32_mbox mb[MBOX_NB_MBX];
77 	struct workqueue_struct *workqueue;
78 	bool secured_soc;
79 };
80 
81 static int stm32_rproc_pa_to_da(struct rproc *rproc, phys_addr_t pa, u64 *da)
82 {
83 	unsigned int i;
84 	struct stm32_rproc *ddata = rproc->priv;
85 	struct stm32_rproc_mem *p_mem;
86 
87 	for (i = 0; i < ddata->nb_rmems; i++) {
88 		p_mem = &ddata->rmems[i];
89 
90 		if (pa < p_mem->bus_addr ||
91 		    pa >= p_mem->bus_addr + p_mem->size)
92 			continue;
93 		*da = pa - p_mem->bus_addr + p_mem->dev_addr;
94 		dev_dbg(rproc->dev.parent, "pa %pa to da %llx\n", &pa, *da);
95 		return 0;
96 	}
97 
98 	return -EINVAL;
99 }
100 
101 static int stm32_rproc_mem_alloc(struct rproc *rproc,
102 				 struct rproc_mem_entry *mem)
103 {
104 	struct device *dev = rproc->dev.parent;
105 	void *va;
106 
107 	dev_dbg(dev, "map memory: %pa+%x\n", &mem->dma, mem->len);
108 	va = ioremap_wc(mem->dma, mem->len);
109 	if (IS_ERR_OR_NULL(va)) {
110 		dev_err(dev, "Unable to map memory region: %pa+%x\n",
111 			&mem->dma, mem->len);
112 		return -ENOMEM;
113 	}
114 
115 	/* Update memory entry va */
116 	mem->va = va;
117 
118 	return 0;
119 }
120 
121 static int stm32_rproc_mem_release(struct rproc *rproc,
122 				   struct rproc_mem_entry *mem)
123 {
124 	dev_dbg(rproc->dev.parent, "unmap memory: %pa\n", &mem->dma);
125 	iounmap(mem->va);
126 
127 	return 0;
128 }
129 
130 static int stm32_rproc_of_memory_translations(struct rproc *rproc)
131 {
132 	struct device *parent, *dev = rproc->dev.parent;
133 	struct stm32_rproc *ddata = rproc->priv;
134 	struct device_node *np;
135 	struct stm32_rproc_mem *p_mems;
136 	struct stm32_rproc_mem_ranges *mem_range;
137 	int cnt, array_size, i, ret = 0;
138 
139 	parent = dev->parent;
140 	np = parent->of_node;
141 
142 	cnt = of_property_count_elems_of_size(np, "dma-ranges",
143 					      sizeof(*mem_range));
144 	if (cnt <= 0) {
145 		dev_err(dev, "%s: dma-ranges property not defined\n", __func__);
146 		return -EINVAL;
147 	}
148 
149 	p_mems = devm_kcalloc(dev, cnt, sizeof(*p_mems), GFP_KERNEL);
150 	if (!p_mems)
151 		return -ENOMEM;
152 	mem_range = kcalloc(cnt, sizeof(*mem_range), GFP_KERNEL);
153 	if (!mem_range)
154 		return -ENOMEM;
155 
156 	array_size = cnt * sizeof(struct stm32_rproc_mem_ranges) / sizeof(u32);
157 
158 	ret = of_property_read_u32_array(np, "dma-ranges",
159 					 (u32 *)mem_range, array_size);
160 	if (ret) {
161 		dev_err(dev, "error while get dma-ranges property: %x\n", ret);
162 		goto free_mem;
163 	}
164 
165 	for (i = 0; i < cnt; i++) {
166 		p_mems[i].bus_addr = mem_range[i].bus_addr;
167 		p_mems[i].dev_addr = mem_range[i].dev_addr;
168 		p_mems[i].size     = mem_range[i].size;
169 
170 		dev_dbg(dev, "memory range[%i]: da %#x, pa %pa, size %#zx:\n",
171 			i, p_mems[i].dev_addr, &p_mems[i].bus_addr,
172 			p_mems[i].size);
173 	}
174 
175 	ddata->rmems = p_mems;
176 	ddata->nb_rmems = cnt;
177 
178 free_mem:
179 	kfree(mem_range);
180 	return ret;
181 }
182 
183 static int stm32_rproc_mbox_idx(struct rproc *rproc, const unsigned char *name)
184 {
185 	struct stm32_rproc *ddata = rproc->priv;
186 	int i;
187 
188 	for (i = 0; i < ARRAY_SIZE(ddata->mb); i++) {
189 		if (!strncmp(ddata->mb[i].name, name, strlen(name)))
190 			return i;
191 	}
192 	dev_err(&rproc->dev, "mailbox %s not found\n", name);
193 
194 	return -EINVAL;
195 }
196 
197 static int stm32_rproc_elf_load_rsc_table(struct rproc *rproc,
198 					  const struct firmware *fw)
199 {
200 	if (rproc_elf_load_rsc_table(rproc, fw))
201 		dev_warn(&rproc->dev, "no resource table found for this firmware\n");
202 
203 	return 0;
204 }
205 
206 static int stm32_rproc_parse_fw(struct rproc *rproc, const struct firmware *fw)
207 {
208 	struct device *dev = rproc->dev.parent;
209 	struct device_node *np = dev->of_node;
210 	struct of_phandle_iterator it;
211 	struct rproc_mem_entry *mem;
212 	struct reserved_mem *rmem;
213 	u64 da;
214 	int index = 0;
215 
216 	/* Register associated reserved memory regions */
217 	of_phandle_iterator_init(&it, np, "memory-region", NULL, 0);
218 	while (of_phandle_iterator_next(&it) == 0) {
219 		rmem = of_reserved_mem_lookup(it.node);
220 		if (!rmem) {
221 			dev_err(dev, "unable to acquire memory-region\n");
222 			return -EINVAL;
223 		}
224 
225 		if (stm32_rproc_pa_to_da(rproc, rmem->base, &da) < 0) {
226 			dev_err(dev, "memory region not valid %pa\n",
227 				&rmem->base);
228 			return -EINVAL;
229 		}
230 
231 		/*  No need to map vdev buffer */
232 		if (strcmp(it.node->name, "vdev0buffer")) {
233 			/* Register memory region */
234 			mem = rproc_mem_entry_init(dev, NULL,
235 						   (dma_addr_t)rmem->base,
236 						   rmem->size, da,
237 						   stm32_rproc_mem_alloc,
238 						   stm32_rproc_mem_release,
239 						   it.node->name);
240 
241 			if (mem)
242 				rproc_coredump_add_segment(rproc, da,
243 							   rmem->size);
244 		} else {
245 			/* Register reserved memory for vdev buffer alloc */
246 			mem = rproc_of_resm_mem_entry_init(dev, index,
247 							   rmem->size,
248 							   rmem->base,
249 							   it.node->name);
250 		}
251 
252 		if (!mem)
253 			return -ENOMEM;
254 
255 		rproc_add_carveout(rproc, mem);
256 		index++;
257 	}
258 
259 	return stm32_rproc_elf_load_rsc_table(rproc, fw);
260 }
261 
262 static irqreturn_t stm32_rproc_wdg(int irq, void *data)
263 {
264 	struct rproc *rproc = data;
265 
266 	rproc_report_crash(rproc, RPROC_WATCHDOG);
267 
268 	return IRQ_HANDLED;
269 }
270 
271 static void stm32_rproc_mb_vq_work(struct work_struct *work)
272 {
273 	struct stm32_mbox *mb = container_of(work, struct stm32_mbox, vq_work);
274 	struct rproc *rproc = dev_get_drvdata(mb->client.dev);
275 
276 	if (rproc_vq_interrupt(rproc, mb->vq_id) == IRQ_NONE)
277 		dev_dbg(&rproc->dev, "no message found in vq%d\n", mb->vq_id);
278 }
279 
280 static void stm32_rproc_mb_callback(struct mbox_client *cl, void *data)
281 {
282 	struct rproc *rproc = dev_get_drvdata(cl->dev);
283 	struct stm32_mbox *mb = container_of(cl, struct stm32_mbox, client);
284 	struct stm32_rproc *ddata = rproc->priv;
285 
286 	queue_work(ddata->workqueue, &mb->vq_work);
287 }
288 
289 static void stm32_rproc_free_mbox(struct rproc *rproc)
290 {
291 	struct stm32_rproc *ddata = rproc->priv;
292 	unsigned int i;
293 
294 	for (i = 0; i < ARRAY_SIZE(ddata->mb); i++) {
295 		if (ddata->mb[i].chan)
296 			mbox_free_channel(ddata->mb[i].chan);
297 		ddata->mb[i].chan = NULL;
298 	}
299 }
300 
301 static const struct stm32_mbox stm32_rproc_mbox[MBOX_NB_MBX] = {
302 	{
303 		.name = STM32_MBX_VQ0,
304 		.vq_id = STM32_MBX_VQ0_ID,
305 		.client = {
306 			.rx_callback = stm32_rproc_mb_callback,
307 			.tx_block = false,
308 		},
309 	},
310 	{
311 		.name = STM32_MBX_VQ1,
312 		.vq_id = STM32_MBX_VQ1_ID,
313 		.client = {
314 			.rx_callback = stm32_rproc_mb_callback,
315 			.tx_block = false,
316 		},
317 	},
318 	{
319 		.name = STM32_MBX_SHUTDOWN,
320 		.vq_id = -1,
321 		.client = {
322 			.tx_block = true,
323 			.tx_done = NULL,
324 			.tx_tout = 500, /* 500 ms time out */
325 		},
326 	}
327 };
328 
329 static int stm32_rproc_request_mbox(struct rproc *rproc)
330 {
331 	struct stm32_rproc *ddata = rproc->priv;
332 	struct device *dev = &rproc->dev;
333 	unsigned int i;
334 	int j;
335 	const unsigned char *name;
336 	struct mbox_client *cl;
337 
338 	/* Initialise mailbox structure table */
339 	memcpy(ddata->mb, stm32_rproc_mbox, sizeof(stm32_rproc_mbox));
340 
341 	for (i = 0; i < MBOX_NB_MBX; i++) {
342 		name = ddata->mb[i].name;
343 
344 		cl = &ddata->mb[i].client;
345 		cl->dev = dev->parent;
346 
347 		ddata->mb[i].chan = mbox_request_channel_byname(cl, name);
348 		if (IS_ERR(ddata->mb[i].chan)) {
349 			if (PTR_ERR(ddata->mb[i].chan) == -EPROBE_DEFER)
350 				goto err_probe;
351 			dev_warn(dev, "cannot get %s mbox\n", name);
352 			ddata->mb[i].chan = NULL;
353 		}
354 		if (ddata->mb[i].vq_id >= 0) {
355 			INIT_WORK(&ddata->mb[i].vq_work,
356 				  stm32_rproc_mb_vq_work);
357 		}
358 	}
359 
360 	return 0;
361 
362 err_probe:
363 	for (j = i - 1; j >= 0; j--)
364 		if (ddata->mb[j].chan)
365 			mbox_free_channel(ddata->mb[j].chan);
366 	return -EPROBE_DEFER;
367 }
368 
369 static int stm32_rproc_set_hold_boot(struct rproc *rproc, bool hold)
370 {
371 	struct stm32_rproc *ddata = rproc->priv;
372 	struct stm32_syscon hold_boot = ddata->hold_boot;
373 	struct arm_smccc_res smc_res;
374 	int val, err;
375 
376 	val = hold ? HOLD_BOOT : RELEASE_BOOT;
377 
378 	if (IS_ENABLED(CONFIG_HAVE_ARM_SMCCC) && ddata->secured_soc) {
379 		arm_smccc_smc(STM32_SMC_RCC, STM32_SMC_REG_WRITE,
380 			      hold_boot.reg, val, 0, 0, 0, 0, &smc_res);
381 		err = smc_res.a0;
382 	} else {
383 		err = regmap_update_bits(hold_boot.map, hold_boot.reg,
384 					 hold_boot.mask, val);
385 	}
386 
387 	if (err)
388 		dev_err(&rproc->dev, "failed to set hold boot\n");
389 
390 	return err;
391 }
392 
393 static void stm32_rproc_add_coredump_trace(struct rproc *rproc)
394 {
395 	struct rproc_debug_trace *trace;
396 	struct rproc_dump_segment *segment;
397 	bool already_added;
398 
399 	list_for_each_entry(trace, &rproc->traces, node) {
400 		already_added = false;
401 
402 		list_for_each_entry(segment, &rproc->dump_segments, node) {
403 			if (segment->da == trace->trace_mem.da) {
404 				already_added = true;
405 				break;
406 			}
407 		}
408 
409 		if (!already_added)
410 			rproc_coredump_add_segment(rproc, trace->trace_mem.da,
411 						   trace->trace_mem.len);
412 	}
413 }
414 
415 static int stm32_rproc_start(struct rproc *rproc)
416 {
417 	struct stm32_rproc *ddata = rproc->priv;
418 	int err;
419 
420 	stm32_rproc_add_coredump_trace(rproc);
421 
422 	/* clear remote proc Deep Sleep */
423 	if (ddata->pdds.map) {
424 		err = regmap_update_bits(ddata->pdds.map, ddata->pdds.reg,
425 					 ddata->pdds.mask, 0);
426 		if (err) {
427 			dev_err(&rproc->dev, "failed to clear pdds\n");
428 			return err;
429 		}
430 	}
431 
432 	err = stm32_rproc_set_hold_boot(rproc, false);
433 	if (err)
434 		return err;
435 
436 	return stm32_rproc_set_hold_boot(rproc, true);
437 }
438 
439 static int stm32_rproc_stop(struct rproc *rproc)
440 {
441 	struct stm32_rproc *ddata = rproc->priv;
442 	int err, dummy_data, idx;
443 
444 	/* request shutdown of the remote processor */
445 	if (rproc->state != RPROC_OFFLINE) {
446 		idx = stm32_rproc_mbox_idx(rproc, STM32_MBX_SHUTDOWN);
447 		if (idx >= 0 && ddata->mb[idx].chan) {
448 			/* a dummy data is sent to allow to block on transmit */
449 			err = mbox_send_message(ddata->mb[idx].chan,
450 						&dummy_data);
451 			if (err < 0)
452 				dev_warn(&rproc->dev, "warning: remote FW shutdown without ack\n");
453 		}
454 	}
455 
456 	err = stm32_rproc_set_hold_boot(rproc, true);
457 	if (err)
458 		return err;
459 
460 	err = reset_control_assert(ddata->rst);
461 	if (err) {
462 		dev_err(&rproc->dev, "failed to assert the reset\n");
463 		return err;
464 	}
465 
466 	/* to allow platform Standby power mode, set remote proc Deep Sleep */
467 	if (ddata->pdds.map) {
468 		err = regmap_update_bits(ddata->pdds.map, ddata->pdds.reg,
469 					 ddata->pdds.mask, 1);
470 		if (err) {
471 			dev_err(&rproc->dev, "failed to set pdds\n");
472 			return err;
473 		}
474 	}
475 
476 	return 0;
477 }
478 
479 static void stm32_rproc_kick(struct rproc *rproc, int vqid)
480 {
481 	struct stm32_rproc *ddata = rproc->priv;
482 	unsigned int i;
483 	int err;
484 
485 	if (WARN_ON(vqid >= MBOX_NB_VQ))
486 		return;
487 
488 	for (i = 0; i < MBOX_NB_MBX; i++) {
489 		if (vqid != ddata->mb[i].vq_id)
490 			continue;
491 		if (!ddata->mb[i].chan)
492 			return;
493 		err = mbox_send_message(ddata->mb[i].chan, (void *)(long)vqid);
494 		if (err < 0)
495 			dev_err(&rproc->dev, "%s: failed (%s, err:%d)\n",
496 				__func__, ddata->mb[i].name, err);
497 		return;
498 	}
499 }
500 
501 static struct rproc_ops st_rproc_ops = {
502 	.start		= stm32_rproc_start,
503 	.stop		= stm32_rproc_stop,
504 	.kick		= stm32_rproc_kick,
505 	.load		= rproc_elf_load_segments,
506 	.parse_fw	= stm32_rproc_parse_fw,
507 	.find_loaded_rsc_table = rproc_elf_find_loaded_rsc_table,
508 	.sanity_check	= rproc_elf_sanity_check,
509 	.get_boot_addr	= rproc_elf_get_boot_addr,
510 };
511 
512 static const struct of_device_id stm32_rproc_match[] = {
513 	{ .compatible = "st,stm32mp1-m4" },
514 	{},
515 };
516 MODULE_DEVICE_TABLE(of, stm32_rproc_match);
517 
518 static int stm32_rproc_get_syscon(struct device_node *np, const char *prop,
519 				  struct stm32_syscon *syscon)
520 {
521 	int err = 0;
522 
523 	syscon->map = syscon_regmap_lookup_by_phandle(np, prop);
524 	if (IS_ERR(syscon->map)) {
525 		err = PTR_ERR(syscon->map);
526 		syscon->map = NULL;
527 		goto out;
528 	}
529 
530 	err = of_property_read_u32_index(np, prop, 1, &syscon->reg);
531 	if (err)
532 		goto out;
533 
534 	err = of_property_read_u32_index(np, prop, 2, &syscon->mask);
535 
536 out:
537 	return err;
538 }
539 
540 static int stm32_rproc_parse_dt(struct platform_device *pdev)
541 {
542 	struct device *dev = &pdev->dev;
543 	struct device_node *np = dev->of_node;
544 	struct rproc *rproc = platform_get_drvdata(pdev);
545 	struct stm32_rproc *ddata = rproc->priv;
546 	struct stm32_syscon tz;
547 	unsigned int tzen;
548 	int err, irq;
549 
550 	irq = platform_get_irq(pdev, 0);
551 	if (irq == -EPROBE_DEFER)
552 		return -EPROBE_DEFER;
553 
554 	if (irq > 0) {
555 		err = devm_request_irq(dev, irq, stm32_rproc_wdg, 0,
556 				       dev_name(dev), rproc);
557 		if (err) {
558 			dev_err(dev, "failed to request wdg irq\n");
559 			return err;
560 		}
561 
562 		ddata->wdg_irq = irq;
563 
564 		if (of_property_read_bool(np, "wakeup-source")) {
565 			device_init_wakeup(dev, true);
566 			dev_pm_set_wake_irq(dev, irq);
567 		}
568 
569 		dev_info(dev, "wdg irq registered\n");
570 	}
571 
572 	ddata->rst = devm_reset_control_get_by_index(dev, 0);
573 	if (IS_ERR(ddata->rst)) {
574 		dev_err(dev, "failed to get mcu reset\n");
575 		return PTR_ERR(ddata->rst);
576 	}
577 
578 	/*
579 	 * if platform is secured the hold boot bit must be written by
580 	 * smc call and read normally.
581 	 * if not secure the hold boot bit could be read/write normally
582 	 */
583 	err = stm32_rproc_get_syscon(np, "st,syscfg-tz", &tz);
584 	if (err) {
585 		dev_err(dev, "failed to get tz syscfg\n");
586 		return err;
587 	}
588 
589 	err = regmap_read(tz.map, tz.reg, &tzen);
590 	if (err) {
591 		dev_err(&rproc->dev, "failed to read tzen\n");
592 		return err;
593 	}
594 	ddata->secured_soc = tzen & tz.mask;
595 
596 	err = stm32_rproc_get_syscon(np, "st,syscfg-holdboot",
597 				     &ddata->hold_boot);
598 	if (err) {
599 		dev_err(dev, "failed to get hold boot\n");
600 		return err;
601 	}
602 
603 	err = stm32_rproc_get_syscon(np, "st,syscfg-pdds", &ddata->pdds);
604 	if (err)
605 		dev_warn(dev, "failed to get pdds\n");
606 
607 	rproc->auto_boot = of_property_read_bool(np, "st,auto-boot");
608 
609 	return stm32_rproc_of_memory_translations(rproc);
610 }
611 
612 static int stm32_rproc_probe(struct platform_device *pdev)
613 {
614 	struct device *dev = &pdev->dev;
615 	struct stm32_rproc *ddata;
616 	struct device_node *np = dev->of_node;
617 	struct rproc *rproc;
618 	int ret;
619 
620 	ret = dma_coerce_mask_and_coherent(dev, DMA_BIT_MASK(32));
621 	if (ret)
622 		return ret;
623 
624 	rproc = rproc_alloc(dev, np->name, &st_rproc_ops, NULL, sizeof(*ddata));
625 	if (!rproc)
626 		return -ENOMEM;
627 
628 	rproc->has_iommu = false;
629 	ddata = rproc->priv;
630 	ddata->workqueue = create_workqueue(dev_name(dev));
631 	if (!ddata->workqueue) {
632 		dev_err(dev, "cannot create workqueue\n");
633 		ret = -ENOMEM;
634 		goto free_rproc;
635 	}
636 
637 	platform_set_drvdata(pdev, rproc);
638 
639 	ret = stm32_rproc_parse_dt(pdev);
640 	if (ret)
641 		goto free_wkq;
642 
643 	ret = stm32_rproc_request_mbox(rproc);
644 	if (ret)
645 		goto free_rproc;
646 
647 	ret = rproc_add(rproc);
648 	if (ret)
649 		goto free_mb;
650 
651 	return 0;
652 
653 free_mb:
654 	stm32_rproc_free_mbox(rproc);
655 free_wkq:
656 	destroy_workqueue(ddata->workqueue);
657 free_rproc:
658 	if (device_may_wakeup(dev)) {
659 		dev_pm_clear_wake_irq(dev);
660 		device_init_wakeup(dev, false);
661 	}
662 	rproc_free(rproc);
663 	return ret;
664 }
665 
666 static int stm32_rproc_remove(struct platform_device *pdev)
667 {
668 	struct rproc *rproc = platform_get_drvdata(pdev);
669 	struct stm32_rproc *ddata = rproc->priv;
670 	struct device *dev = &pdev->dev;
671 
672 	if (atomic_read(&rproc->power) > 0)
673 		rproc_shutdown(rproc);
674 
675 	rproc_del(rproc);
676 	stm32_rproc_free_mbox(rproc);
677 	destroy_workqueue(ddata->workqueue);
678 
679 	if (device_may_wakeup(dev)) {
680 		dev_pm_clear_wake_irq(dev);
681 		device_init_wakeup(dev, false);
682 	}
683 	rproc_free(rproc);
684 
685 	return 0;
686 }
687 
688 static int __maybe_unused stm32_rproc_suspend(struct device *dev)
689 {
690 	struct rproc *rproc = dev_get_drvdata(dev);
691 	struct stm32_rproc *ddata = rproc->priv;
692 
693 	if (device_may_wakeup(dev))
694 		return enable_irq_wake(ddata->wdg_irq);
695 
696 	return 0;
697 }
698 
699 static int __maybe_unused stm32_rproc_resume(struct device *dev)
700 {
701 	struct rproc *rproc = dev_get_drvdata(dev);
702 	struct stm32_rproc *ddata = rproc->priv;
703 
704 	if (device_may_wakeup(dev))
705 		return disable_irq_wake(ddata->wdg_irq);
706 
707 	return 0;
708 }
709 
710 static SIMPLE_DEV_PM_OPS(stm32_rproc_pm_ops,
711 			 stm32_rproc_suspend, stm32_rproc_resume);
712 
713 static struct platform_driver stm32_rproc_driver = {
714 	.probe = stm32_rproc_probe,
715 	.remove = stm32_rproc_remove,
716 	.driver = {
717 		.name = "stm32-rproc",
718 		.pm = &stm32_rproc_pm_ops,
719 		.of_match_table = of_match_ptr(stm32_rproc_match),
720 	},
721 };
722 module_platform_driver(stm32_rproc_driver);
723 
724 MODULE_DESCRIPTION("STM32 Remote Processor Control Driver");
725 MODULE_AUTHOR("Ludovic Barre <ludovic.barre@st.com>");
726 MODULE_AUTHOR("Fabien Dessenne <fabien.dessenne@st.com>");
727 MODULE_LICENSE("GPL v2");
728 
729