1 // SPDX-License-Identifier: GPL-2.0
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.
8 #include <linux/arm-smccc.h>
9 #include <linux/dma-mapping.h>
10 #include <linux/interrupt.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/slab.h>
23 #include <linux/workqueue.h>
25 #include "remoteproc_internal.h"
28 #define RELEASE_BOOT 1
33 #define STM32_SMC_RCC 0x82001000
34 #define STM32_SMC_REG_WRITE 0x1
36 #define STM32_MBX_VQ0 "vq0"
37 #define STM32_MBX_VQ0_ID 0
38 #define STM32_MBX_VQ1 "vq1"
39 #define STM32_MBX_VQ1_ID 1
40 #define STM32_MBX_SHUTDOWN "shutdown"
41 #define STM32_MBX_DETACH "detach"
43 #define RSC_TBL_SIZE 1024
45 #define M4_STATE_OFF 0
46 #define M4_STATE_INI 1
47 #define M4_STATE_CRUN 2
48 #define M4_STATE_CSTOP 3
49 #define M4_STATE_STANDBY 4
50 #define M4_STATE_CRASH 5
58 struct stm32_rproc_mem {
60 void __iomem *cpu_addr;
66 struct stm32_rproc_mem_ranges {
73 const unsigned char name[10];
74 struct mbox_chan *chan;
75 struct mbox_client client;
76 struct work_struct vq_work;
81 struct reset_control *rst;
82 struct stm32_syscon hold_boot;
83 struct stm32_syscon pdds;
84 struct stm32_syscon m4_state;
85 struct stm32_syscon rsctbl;
88 struct stm32_rproc_mem *rmems;
89 struct stm32_mbox mb[MBOX_NB_MBX];
90 struct workqueue_struct *workqueue;
95 static int stm32_rproc_pa_to_da(struct rproc *rproc, phys_addr_t pa, u64 *da)
98 struct stm32_rproc *ddata = rproc->priv;
99 struct stm32_rproc_mem *p_mem;
101 for (i = 0; i < ddata->nb_rmems; i++) {
102 p_mem = &ddata->rmems[i];
104 if (pa < p_mem->bus_addr ||
105 pa >= p_mem->bus_addr + p_mem->size)
107 *da = pa - p_mem->bus_addr + p_mem->dev_addr;
108 dev_dbg(rproc->dev.parent, "pa %pa to da %llx\n", &pa, *da);
115 static int stm32_rproc_mem_alloc(struct rproc *rproc,
116 struct rproc_mem_entry *mem)
118 struct device *dev = rproc->dev.parent;
121 dev_dbg(dev, "map memory: %pa+%x\n", &mem->dma, mem->len);
122 va = ioremap_wc(mem->dma, mem->len);
123 if (IS_ERR_OR_NULL(va)) {
124 dev_err(dev, "Unable to map memory region: %pa+%x\n",
125 &mem->dma, mem->len);
129 /* Update memory entry va */
135 static int stm32_rproc_mem_release(struct rproc *rproc,
136 struct rproc_mem_entry *mem)
138 dev_dbg(rproc->dev.parent, "unmap memory: %pa\n", &mem->dma);
144 static int stm32_rproc_of_memory_translations(struct platform_device *pdev,
145 struct stm32_rproc *ddata)
147 struct device *parent, *dev = &pdev->dev;
148 struct device_node *np;
149 struct stm32_rproc_mem *p_mems;
150 struct stm32_rproc_mem_ranges *mem_range;
151 int cnt, array_size, i, ret = 0;
153 parent = dev->parent;
154 np = parent->of_node;
156 cnt = of_property_count_elems_of_size(np, "dma-ranges",
159 dev_err(dev, "%s: dma-ranges property not defined\n", __func__);
163 p_mems = devm_kcalloc(dev, cnt, sizeof(*p_mems), GFP_KERNEL);
166 mem_range = kcalloc(cnt, sizeof(*mem_range), GFP_KERNEL);
170 array_size = cnt * sizeof(struct stm32_rproc_mem_ranges) / sizeof(u32);
172 ret = of_property_read_u32_array(np, "dma-ranges",
173 (u32 *)mem_range, array_size);
175 dev_err(dev, "error while get dma-ranges property: %x\n", ret);
179 for (i = 0; i < cnt; i++) {
180 p_mems[i].bus_addr = mem_range[i].bus_addr;
181 p_mems[i].dev_addr = mem_range[i].dev_addr;
182 p_mems[i].size = mem_range[i].size;
184 dev_dbg(dev, "memory range[%i]: da %#x, pa %pa, size %#zx:\n",
185 i, p_mems[i].dev_addr, &p_mems[i].bus_addr,
189 ddata->rmems = p_mems;
190 ddata->nb_rmems = cnt;
197 static int stm32_rproc_mbox_idx(struct rproc *rproc, const unsigned char *name)
199 struct stm32_rproc *ddata = rproc->priv;
202 for (i = 0; i < ARRAY_SIZE(ddata->mb); i++) {
203 if (!strncmp(ddata->mb[i].name, name, strlen(name)))
206 dev_err(&rproc->dev, "mailbox %s not found\n", name);
211 static int stm32_rproc_prepare(struct rproc *rproc)
213 struct device *dev = rproc->dev.parent;
214 struct device_node *np = dev->of_node;
215 struct of_phandle_iterator it;
216 struct rproc_mem_entry *mem;
217 struct reserved_mem *rmem;
221 /* Register associated reserved memory regions */
222 of_phandle_iterator_init(&it, np, "memory-region", NULL, 0);
223 while (of_phandle_iterator_next(&it) == 0) {
224 rmem = of_reserved_mem_lookup(it.node);
226 dev_err(dev, "unable to acquire memory-region\n");
230 if (stm32_rproc_pa_to_da(rproc, rmem->base, &da) < 0) {
231 dev_err(dev, "memory region not valid %pa\n",
236 /* No need to map vdev buffer */
237 if (strcmp(it.node->name, "vdev0buffer")) {
238 /* Register memory region */
239 mem = rproc_mem_entry_init(dev, NULL,
240 (dma_addr_t)rmem->base,
242 stm32_rproc_mem_alloc,
243 stm32_rproc_mem_release,
247 rproc_coredump_add_segment(rproc, da,
250 /* Register reserved memory for vdev buffer alloc */
251 mem = rproc_of_resm_mem_entry_init(dev, index,
260 rproc_add_carveout(rproc, mem);
267 static int stm32_rproc_parse_fw(struct rproc *rproc, const struct firmware *fw)
269 if (rproc_elf_load_rsc_table(rproc, fw))
270 dev_warn(&rproc->dev, "no resource table found for this firmware\n");
275 static irqreturn_t stm32_rproc_wdg(int irq, void *data)
277 struct platform_device *pdev = data;
278 struct rproc *rproc = platform_get_drvdata(pdev);
280 rproc_report_crash(rproc, RPROC_WATCHDOG);
285 static void stm32_rproc_mb_vq_work(struct work_struct *work)
287 struct stm32_mbox *mb = container_of(work, struct stm32_mbox, vq_work);
288 struct rproc *rproc = dev_get_drvdata(mb->client.dev);
290 if (rproc_vq_interrupt(rproc, mb->vq_id) == IRQ_NONE)
291 dev_dbg(&rproc->dev, "no message found in vq%d\n", mb->vq_id);
294 static void stm32_rproc_mb_callback(struct mbox_client *cl, void *data)
296 struct rproc *rproc = dev_get_drvdata(cl->dev);
297 struct stm32_mbox *mb = container_of(cl, struct stm32_mbox, client);
298 struct stm32_rproc *ddata = rproc->priv;
300 queue_work(ddata->workqueue, &mb->vq_work);
303 static void stm32_rproc_free_mbox(struct rproc *rproc)
305 struct stm32_rproc *ddata = rproc->priv;
308 for (i = 0; i < ARRAY_SIZE(ddata->mb); i++) {
309 if (ddata->mb[i].chan)
310 mbox_free_channel(ddata->mb[i].chan);
311 ddata->mb[i].chan = NULL;
315 static const struct stm32_mbox stm32_rproc_mbox[MBOX_NB_MBX] = {
317 .name = STM32_MBX_VQ0,
318 .vq_id = STM32_MBX_VQ0_ID,
320 .rx_callback = stm32_rproc_mb_callback,
325 .name = STM32_MBX_VQ1,
326 .vq_id = STM32_MBX_VQ1_ID,
328 .rx_callback = stm32_rproc_mb_callback,
333 .name = STM32_MBX_SHUTDOWN,
338 .tx_tout = 500, /* 500 ms time out */
342 .name = STM32_MBX_DETACH,
347 .tx_tout = 200, /* 200 ms time out to detach should be fair enough */
352 static int stm32_rproc_request_mbox(struct rproc *rproc)
354 struct stm32_rproc *ddata = rproc->priv;
355 struct device *dev = &rproc->dev;
358 const unsigned char *name;
359 struct mbox_client *cl;
361 /* Initialise mailbox structure table */
362 memcpy(ddata->mb, stm32_rproc_mbox, sizeof(stm32_rproc_mbox));
364 for (i = 0; i < MBOX_NB_MBX; i++) {
365 name = ddata->mb[i].name;
367 cl = &ddata->mb[i].client;
368 cl->dev = dev->parent;
370 ddata->mb[i].chan = mbox_request_channel_byname(cl, name);
371 if (IS_ERR(ddata->mb[i].chan)) {
372 if (PTR_ERR(ddata->mb[i].chan) == -EPROBE_DEFER) {
373 dev_err_probe(dev->parent,
374 PTR_ERR(ddata->mb[i].chan),
375 "failed to request mailbox %s\n",
379 dev_warn(dev, "cannot get %s mbox\n", name);
380 ddata->mb[i].chan = NULL;
382 if (ddata->mb[i].vq_id >= 0) {
383 INIT_WORK(&ddata->mb[i].vq_work,
384 stm32_rproc_mb_vq_work);
391 for (j = i - 1; j >= 0; j--)
392 if (ddata->mb[j].chan)
393 mbox_free_channel(ddata->mb[j].chan);
394 return -EPROBE_DEFER;
397 static int stm32_rproc_set_hold_boot(struct rproc *rproc, bool hold)
399 struct stm32_rproc *ddata = rproc->priv;
400 struct stm32_syscon hold_boot = ddata->hold_boot;
401 struct arm_smccc_res smc_res;
404 val = hold ? HOLD_BOOT : RELEASE_BOOT;
406 if (IS_ENABLED(CONFIG_HAVE_ARM_SMCCC) && ddata->secured_soc) {
407 arm_smccc_smc(STM32_SMC_RCC, STM32_SMC_REG_WRITE,
408 hold_boot.reg, val, 0, 0, 0, 0, &smc_res);
411 err = regmap_update_bits(hold_boot.map, hold_boot.reg,
412 hold_boot.mask, val);
416 dev_err(&rproc->dev, "failed to set hold boot\n");
421 static void stm32_rproc_add_coredump_trace(struct rproc *rproc)
423 struct rproc_debug_trace *trace;
424 struct rproc_dump_segment *segment;
427 list_for_each_entry(trace, &rproc->traces, node) {
428 already_added = false;
430 list_for_each_entry(segment, &rproc->dump_segments, node) {
431 if (segment->da == trace->trace_mem.da) {
432 already_added = true;
438 rproc_coredump_add_segment(rproc, trace->trace_mem.da,
439 trace->trace_mem.len);
443 static int stm32_rproc_start(struct rproc *rproc)
445 struct stm32_rproc *ddata = rproc->priv;
448 stm32_rproc_add_coredump_trace(rproc);
450 /* clear remote proc Deep Sleep */
451 if (ddata->pdds.map) {
452 err = regmap_update_bits(ddata->pdds.map, ddata->pdds.reg,
453 ddata->pdds.mask, 0);
455 dev_err(&rproc->dev, "failed to clear pdds\n");
460 err = stm32_rproc_set_hold_boot(rproc, false);
464 return stm32_rproc_set_hold_boot(rproc, true);
467 static int stm32_rproc_attach(struct rproc *rproc)
469 stm32_rproc_add_coredump_trace(rproc);
471 return stm32_rproc_set_hold_boot(rproc, true);
474 static int stm32_rproc_detach(struct rproc *rproc)
476 struct stm32_rproc *ddata = rproc->priv;
477 int err, dummy_data, idx;
479 /* Inform the remote processor of the detach */
480 idx = stm32_rproc_mbox_idx(rproc, STM32_MBX_DETACH);
481 if (idx >= 0 && ddata->mb[idx].chan) {
482 /* A dummy data is sent to allow to block on transmit */
483 err = mbox_send_message(ddata->mb[idx].chan,
486 dev_warn(&rproc->dev, "warning: remote FW detach without ack\n");
489 /* Allow remote processor to auto-reboot */
490 return stm32_rproc_set_hold_boot(rproc, false);
493 static int stm32_rproc_stop(struct rproc *rproc)
495 struct stm32_rproc *ddata = rproc->priv;
496 int err, dummy_data, idx;
498 /* request shutdown of the remote processor */
499 if (rproc->state != RPROC_OFFLINE) {
500 idx = stm32_rproc_mbox_idx(rproc, STM32_MBX_SHUTDOWN);
501 if (idx >= 0 && ddata->mb[idx].chan) {
502 /* a dummy data is sent to allow to block on transmit */
503 err = mbox_send_message(ddata->mb[idx].chan,
506 dev_warn(&rproc->dev, "warning: remote FW shutdown without ack\n");
510 err = stm32_rproc_set_hold_boot(rproc, true);
514 err = reset_control_assert(ddata->rst);
516 dev_err(&rproc->dev, "failed to assert the reset\n");
520 /* to allow platform Standby power mode, set remote proc Deep Sleep */
521 if (ddata->pdds.map) {
522 err = regmap_update_bits(ddata->pdds.map, ddata->pdds.reg,
523 ddata->pdds.mask, 1);
525 dev_err(&rproc->dev, "failed to set pdds\n");
530 /* update coprocessor state to OFF if available */
531 if (ddata->m4_state.map) {
532 err = regmap_update_bits(ddata->m4_state.map,
534 ddata->m4_state.mask,
537 dev_err(&rproc->dev, "failed to set copro state\n");
545 static void stm32_rproc_kick(struct rproc *rproc, int vqid)
547 struct stm32_rproc *ddata = rproc->priv;
551 if (WARN_ON(vqid >= MBOX_NB_VQ))
554 for (i = 0; i < MBOX_NB_MBX; i++) {
555 if (vqid != ddata->mb[i].vq_id)
557 if (!ddata->mb[i].chan)
559 err = mbox_send_message(ddata->mb[i].chan, (void *)(long)vqid);
561 dev_err(&rproc->dev, "%s: failed (%s, err:%d)\n",
562 __func__, ddata->mb[i].name, err);
567 static int stm32_rproc_da_to_pa(struct rproc *rproc,
568 u64 da, phys_addr_t *pa)
570 struct stm32_rproc *ddata = rproc->priv;
571 struct device *dev = rproc->dev.parent;
572 struct stm32_rproc_mem *p_mem;
575 for (i = 0; i < ddata->nb_rmems; i++) {
576 p_mem = &ddata->rmems[i];
578 if (da < p_mem->dev_addr ||
579 da >= p_mem->dev_addr + p_mem->size)
582 *pa = da - p_mem->dev_addr + p_mem->bus_addr;
583 dev_dbg(dev, "da %llx to pa %#x\n", da, *pa);
588 dev_err(dev, "can't translate da %llx\n", da);
593 static struct resource_table *
594 stm32_rproc_get_loaded_rsc_table(struct rproc *rproc, size_t *table_sz)
596 struct stm32_rproc *ddata = rproc->priv;
597 struct device *dev = rproc->dev.parent;
602 /* The resource table has already been mapped, nothing to do */
606 err = regmap_read(ddata->rsctbl.map, ddata->rsctbl.reg, &rsc_da);
608 dev_err(dev, "failed to read rsc tbl addr\n");
609 return ERR_PTR(-EINVAL);
614 return ERR_PTR(-ENOENT);
616 err = stm32_rproc_da_to_pa(rproc, rsc_da, &rsc_pa);
620 ddata->rsc_va = devm_ioremap_wc(dev, rsc_pa, RSC_TBL_SIZE);
621 if (IS_ERR_OR_NULL(ddata->rsc_va)) {
622 dev_err(dev, "Unable to map memory region: %pa+%zx\n",
623 &rsc_pa, RSC_TBL_SIZE);
624 ddata->rsc_va = NULL;
625 return ERR_PTR(-ENOMEM);
630 * Assuming the resource table fits in 1kB is fair.
631 * Notice for the detach, that this 1 kB memory area has to be reserved in the coprocessor
632 * firmware for the resource table. On detach, the remoteproc core re-initializes this
633 * entire area by overwriting it with the initial values stored in rproc->clean_table.
635 *table_sz = RSC_TBL_SIZE;
636 return (struct resource_table *)ddata->rsc_va;
639 static const struct rproc_ops st_rproc_ops = {
640 .prepare = stm32_rproc_prepare,
641 .start = stm32_rproc_start,
642 .stop = stm32_rproc_stop,
643 .attach = stm32_rproc_attach,
644 .detach = stm32_rproc_detach,
645 .kick = stm32_rproc_kick,
646 .load = rproc_elf_load_segments,
647 .parse_fw = stm32_rproc_parse_fw,
648 .find_loaded_rsc_table = rproc_elf_find_loaded_rsc_table,
649 .get_loaded_rsc_table = stm32_rproc_get_loaded_rsc_table,
650 .sanity_check = rproc_elf_sanity_check,
651 .get_boot_addr = rproc_elf_get_boot_addr,
654 static const struct of_device_id stm32_rproc_match[] = {
655 { .compatible = "st,stm32mp1-m4" },
658 MODULE_DEVICE_TABLE(of, stm32_rproc_match);
660 static int stm32_rproc_get_syscon(struct device_node *np, const char *prop,
661 struct stm32_syscon *syscon)
665 syscon->map = syscon_regmap_lookup_by_phandle(np, prop);
666 if (IS_ERR(syscon->map)) {
667 err = PTR_ERR(syscon->map);
672 err = of_property_read_u32_index(np, prop, 1, &syscon->reg);
676 err = of_property_read_u32_index(np, prop, 2, &syscon->mask);
682 static int stm32_rproc_parse_dt(struct platform_device *pdev,
683 struct stm32_rproc *ddata, bool *auto_boot)
685 struct device *dev = &pdev->dev;
686 struct device_node *np = dev->of_node;
687 struct stm32_syscon tz;
691 irq = platform_get_irq(pdev, 0);
692 if (irq == -EPROBE_DEFER)
693 return dev_err_probe(dev, irq, "failed to get interrupt\n");
696 err = devm_request_irq(dev, irq, stm32_rproc_wdg, 0,
697 dev_name(dev), pdev);
699 return dev_err_probe(dev, err,
700 "failed to request wdg irq\n");
702 ddata->wdg_irq = irq;
704 if (of_property_read_bool(np, "wakeup-source")) {
705 device_init_wakeup(dev, true);
706 dev_pm_set_wake_irq(dev, irq);
709 dev_info(dev, "wdg irq registered\n");
712 ddata->rst = devm_reset_control_get_by_index(dev, 0);
713 if (IS_ERR(ddata->rst))
714 return dev_err_probe(dev, PTR_ERR(ddata->rst),
715 "failed to get mcu_reset\n");
718 * if platform is secured the hold boot bit must be written by
719 * smc call and read normally.
720 * if not secure the hold boot bit could be read/write normally
722 err = stm32_rproc_get_syscon(np, "st,syscfg-tz", &tz);
724 dev_err(dev, "failed to get tz syscfg\n");
728 err = regmap_read(tz.map, tz.reg, &tzen);
730 dev_err(dev, "failed to read tzen\n");
733 ddata->secured_soc = tzen & tz.mask;
735 err = stm32_rproc_get_syscon(np, "st,syscfg-holdboot",
738 dev_err(dev, "failed to get hold boot\n");
742 err = stm32_rproc_get_syscon(np, "st,syscfg-pdds", &ddata->pdds);
744 dev_info(dev, "failed to get pdds\n");
746 *auto_boot = of_property_read_bool(np, "st,auto-boot");
749 * See if we can check the M4 status, i.e if it was started
750 * from the boot loader or not.
752 err = stm32_rproc_get_syscon(np, "st,syscfg-m4-state",
756 ddata->m4_state.map = NULL;
757 /* no coprocessor state syscon (optional) */
758 dev_warn(dev, "m4 state not supported\n");
760 /* no need to go further */
764 /* See if we can get the resource table */
765 err = stm32_rproc_get_syscon(np, "st,syscfg-rsc-tbl",
768 /* no rsc table syscon (optional) */
769 dev_warn(dev, "rsc tbl syscon not supported\n");
775 static int stm32_rproc_get_m4_status(struct stm32_rproc *ddata,
778 /* See stm32_rproc_parse_dt() */
779 if (!ddata->m4_state.map) {
781 * We couldn't get the coprocessor's state, assume
784 *state = M4_STATE_OFF;
788 return regmap_read(ddata->m4_state.map, ddata->m4_state.reg, state);
791 static int stm32_rproc_probe(struct platform_device *pdev)
793 struct device *dev = &pdev->dev;
794 struct stm32_rproc *ddata;
795 struct device_node *np = dev->of_node;
800 ret = dma_coerce_mask_and_coherent(dev, DMA_BIT_MASK(32));
804 rproc = rproc_alloc(dev, np->name, &st_rproc_ops, NULL, sizeof(*ddata));
810 rproc_coredump_set_elf_info(rproc, ELFCLASS32, EM_NONE);
812 ret = stm32_rproc_parse_dt(pdev, ddata, &rproc->auto_boot);
816 ret = stm32_rproc_of_memory_translations(pdev, ddata);
820 ret = stm32_rproc_get_m4_status(ddata, &state);
824 if (state == M4_STATE_CRUN)
825 rproc->state = RPROC_DETACHED;
827 rproc->has_iommu = false;
828 ddata->workqueue = create_workqueue(dev_name(dev));
829 if (!ddata->workqueue) {
830 dev_err(dev, "cannot create workqueue\n");
835 platform_set_drvdata(pdev, rproc);
837 ret = stm32_rproc_request_mbox(rproc);
841 ret = rproc_add(rproc);
848 stm32_rproc_free_mbox(rproc);
850 destroy_workqueue(ddata->workqueue);
852 rproc_resource_cleanup(rproc);
854 if (device_may_wakeup(dev)) {
855 dev_pm_clear_wake_irq(dev);
856 device_init_wakeup(dev, false);
862 static int stm32_rproc_remove(struct platform_device *pdev)
864 struct rproc *rproc = platform_get_drvdata(pdev);
865 struct stm32_rproc *ddata = rproc->priv;
866 struct device *dev = &pdev->dev;
868 if (atomic_read(&rproc->power) > 0)
869 rproc_shutdown(rproc);
872 stm32_rproc_free_mbox(rproc);
873 destroy_workqueue(ddata->workqueue);
875 if (device_may_wakeup(dev)) {
876 dev_pm_clear_wake_irq(dev);
877 device_init_wakeup(dev, false);
884 static int __maybe_unused stm32_rproc_suspend(struct device *dev)
886 struct rproc *rproc = dev_get_drvdata(dev);
887 struct stm32_rproc *ddata = rproc->priv;
889 if (device_may_wakeup(dev))
890 return enable_irq_wake(ddata->wdg_irq);
895 static int __maybe_unused stm32_rproc_resume(struct device *dev)
897 struct rproc *rproc = dev_get_drvdata(dev);
898 struct stm32_rproc *ddata = rproc->priv;
900 if (device_may_wakeup(dev))
901 return disable_irq_wake(ddata->wdg_irq);
906 static SIMPLE_DEV_PM_OPS(stm32_rproc_pm_ops,
907 stm32_rproc_suspend, stm32_rproc_resume);
909 static struct platform_driver stm32_rproc_driver = {
910 .probe = stm32_rproc_probe,
911 .remove = stm32_rproc_remove,
913 .name = "stm32-rproc",
914 .pm = &stm32_rproc_pm_ops,
915 .of_match_table = of_match_ptr(stm32_rproc_match),
918 module_platform_driver(stm32_rproc_driver);
920 MODULE_DESCRIPTION("STM32 Remote Processor Control Driver");
921 MODULE_AUTHOR("Ludovic Barre <ludovic.barre@st.com>");
922 MODULE_AUTHOR("Fabien Dessenne <fabien.dessenne@st.com>");
923 MODULE_LICENSE("GPL v2");