[linux-block.git] / drivers / remoteproc / stm32_rproc.c

// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (C) STMicroelectronics 2018 - All Rights Reserved
 * Authors: Ludovic Barre <ludovic.barre@st.com> for STMicroelectronics.
 *          Fabien Dessenne <fabien.dessenne@st.com> for STMicroelectronics.
 */

#include <linux/arm-smccc.h>
#include <linux/dma-mapping.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/mailbox_client.h>
#include <linux/mfd/syscon.h>
#include <linux/module.h>
#include <linux/of_address.h>
#include <linux/of_device.h>
#include <linux/of_reserved_mem.h>
#include <linux/pm_wakeirq.h>
#include <linux/regmap.h>
#include <linux/remoteproc.h>
#include <linux/reset.h>
#include <linux/workqueue.h>

#include "remoteproc_internal.h"

#define HOLD_BOOT		0
#define RELEASE_BOOT		1

#define MBOX_NB_VQ		2
#define MBOX_NB_MBX		3

#define STM32_SMC_RCC		0x82001000
#define STM32_SMC_REG_WRITE	0x1

#define STM32_MBX_VQ0		"vq0"
#define STM32_MBX_VQ0_ID	0
#define STM32_MBX_VQ1		"vq1"
#define STM32_MBX_VQ1_ID	1
#define STM32_MBX_SHUTDOWN	"shutdown"

struct stm32_syscon {
	struct regmap *map;
	u32 reg;
	u32 mask;
};

struct stm32_rproc_mem {
	char name[20];
	void __iomem *cpu_addr;
	phys_addr_t bus_addr;
	u32 dev_addr;
	size_t size;
};

struct stm32_rproc_mem_ranges {
	u32 dev_addr;
	u32 bus_addr;
	u32 size;
};

struct stm32_mbox {
	const unsigned char name[10];
	struct mbox_chan *chan;
	struct mbox_client client;
	struct work_struct vq_work;
	int vq_id;
};

struct stm32_rproc {
	struct reset_control *rst;
	struct stm32_syscon hold_boot;
	struct stm32_syscon pdds;
	int wdg_irq;
	u32 nb_rmems;
	struct stm32_rproc_mem *rmems;
	struct stm32_mbox mb[MBOX_NB_MBX];
	struct workqueue_struct *workqueue;
	bool secured_soc;
};

static int stm32_rproc_pa_to_da(struct rproc *rproc, phys_addr_t pa, u64 *da)
{
	unsigned int i;
	struct stm32_rproc *ddata = rproc->priv;
	struct stm32_rproc_mem *p_mem;

	for (i = 0; i < ddata->nb_rmems; i++) {
		p_mem = &ddata->rmems[i];

		if (pa < p_mem->bus_addr ||
		    pa >= p_mem->bus_addr + p_mem->size)
			continue;
		*da = pa - p_mem->bus_addr + p_mem->dev_addr;
		dev_dbg(rproc->dev.parent, "pa %pa to da %llx\n", &pa, *da);
		return 0;
	}

	return -EINVAL;
}

static int stm32_rproc_mem_alloc(struct rproc *rproc,
				 struct rproc_mem_entry *mem)
{
	struct device *dev = rproc->dev.parent;
	void *va;

	dev_dbg(dev, "map memory: %pa+%x\n", &mem->dma, mem->len);
	va = ioremap_wc(mem->dma, mem->len);
	if (IS_ERR_OR_NULL(va)) {
		dev_err(dev, "Unable to map memory region: %pa+%x\n",
			&mem->dma, mem->len);
		return -ENOMEM;
	}

	/* Update memory entry va */
	mem->va = va;

	return 0;
}

static int stm32_rproc_mem_release(struct rproc *rproc,
				   struct rproc_mem_entry *mem)
{
	dev_dbg(rproc->dev.parent, "unmap memory: %pa\n", &mem->dma);
	iounmap(mem->va);

	return 0;
}

static int stm32_rproc_of_memory_translations(struct rproc *rproc)
{
	struct device *parent, *dev = rproc->dev.parent;
	struct stm32_rproc *ddata = rproc->priv;
	struct device_node *np;
	struct stm32_rproc_mem *p_mems;
	struct stm32_rproc_mem_ranges *mem_range;
	int cnt, array_size, i, ret = 0;

	parent = dev->parent;
	np = parent->of_node;

	cnt = of_property_count_elems_of_size(np, "dma-ranges",
					      sizeof(*mem_range));
	if (cnt <= 0) {
		dev_err(dev, "%s: dma-ranges property not defined\n", __func__);
		return -EINVAL;
	}

	p_mems = devm_kcalloc(dev, cnt, sizeof(*p_mems), GFP_KERNEL);
	if (!p_mems)
		return -ENOMEM;
	mem_range = kcalloc(cnt, sizeof(*mem_range), GFP_KERNEL);
	if (!mem_range)
		return -ENOMEM;

	array_size = cnt * sizeof(struct stm32_rproc_mem_ranges) / sizeof(u32);

	ret = of_property_read_u32_array(np, "dma-ranges",
					 (u32 *)mem_range, array_size);
	if (ret) {
		dev_err(dev, "error while get dma-ranges property: %x\n", ret);
		goto free_mem;
	}

	for (i = 0; i < cnt; i++) {
		p_mems[i].bus_addr = mem_range[i].bus_addr;
		p_mems[i].dev_addr = mem_range[i].dev_addr;
		p_mems[i].size     = mem_range[i].size;

		dev_dbg(dev, "memory range[%i]: da %#x, pa %pa, size %#zx:\n",
			i, p_mems[i].dev_addr, &p_mems[i].bus_addr,
			p_mems[i].size);
	}

	ddata->rmems = p_mems;
	ddata->nb_rmems = cnt;

free_mem:
	kfree(mem_range);
	return ret;
}

static int stm32_rproc_mbox_idx(struct rproc *rproc, const unsigned char *name)
{
	struct stm32_rproc *ddata = rproc->priv;
	int i;

	for (i = 0; i < ARRAY_SIZE(ddata->mb); i++) {
		if (!strncmp(ddata->mb[i].name, name, strlen(name)))
			return i;
	}
	dev_err(&rproc->dev, "mailbox %s not found\n", name);

	return -EINVAL;
}

static int stm32_rproc_elf_load_rsc_table(struct rproc *rproc,
					  const struct firmware *fw)
{
	if (rproc_elf_load_rsc_table(rproc, fw))
		dev_warn(&rproc->dev, "no resource table found for this firmware\n");

	return 0;
}

static int stm32_rproc_parse_fw(struct rproc *rproc, const struct firmware *fw)
{
	struct device *dev = rproc->dev.parent;
	struct device_node *np = dev->of_node;
	struct of_phandle_iterator it;
	struct rproc_mem_entry *mem;
	struct reserved_mem *rmem;
	u64 da;
	int index = 0;

	/* Register associated reserved memory regions */
	of_phandle_iterator_init(&it, np, "memory-region", NULL, 0);
	while (of_phandle_iterator_next(&it) == 0) {
		rmem = of_reserved_mem_lookup(it.node);
		if (!rmem) {
			dev_err(dev, "unable to acquire memory-region\n");
			return -EINVAL;
		}

		if (stm32_rproc_pa_to_da(rproc, rmem->base, &da) < 0) {
			dev_err(dev, "memory region not valid %pa\n",
				&rmem->base);
			return -EINVAL;
		}

		/*  No need to map vdev buffer */
		if (strcmp(it.node->name, "vdev0buffer")) {
			/* Register memory region */
			mem = rproc_mem_entry_init(dev, NULL,
						   (dma_addr_t)rmem->base,
						   rmem->size, da,
						   stm32_rproc_mem_alloc,
						   stm32_rproc_mem_release,
						   it.node->name);

			if (mem)
				rproc_coredump_add_segment(rproc, da,
							   rmem->size);
		} else {
			/* Register reserved memory for vdev buffer alloc */
			mem = rproc_of_resm_mem_entry_init(dev, index,
							   rmem->size,
							   rmem->base,
							   it.node->name);
		}

		if (!mem)
			return -ENOMEM;

		rproc_add_carveout(rproc, mem);
		index++;
	}

	return stm32_rproc_elf_load_rsc_table(rproc, fw);
}

static irqreturn_t stm32_rproc_wdg(int irq, void *data)
{
	struct rproc *rproc = data;

	rproc_report_crash(rproc, RPROC_WATCHDOG);

	return IRQ_HANDLED;
}

static void stm32_rproc_mb_vq_work(struct work_struct *work)
{
	struct stm32_mbox *mb = container_of(work, struct stm32_mbox, vq_work);
	struct rproc *rproc = dev_get_drvdata(mb->client.dev);

	if (rproc_vq_interrupt(rproc, mb->vq_id) == IRQ_NONE)
		dev_dbg(&rproc->dev, "no message found in vq%d\n", mb->vq_id);
}

static void stm32_rproc_mb_callback(struct mbox_client *cl, void *data)
{
	struct rproc *rproc = dev_get_drvdata(cl->dev);
	struct stm32_mbox *mb = container_of(cl, struct stm32_mbox, client);
	struct stm32_rproc *ddata = rproc->priv;

	queue_work(ddata->workqueue, &mb->vq_work);
}

static void stm32_rproc_free_mbox(struct rproc *rproc)
{
	struct stm32_rproc *ddata = rproc->priv;
	unsigned int i;

	for (i = 0; i < ARRAY_SIZE(ddata->mb); i++) {
		if (ddata->mb[i].chan)
			mbox_free_channel(ddata->mb[i].chan);
		ddata->mb[i].chan = NULL;
	}
}

static const struct stm32_mbox stm32_rproc_mbox[MBOX_NB_MBX] = {
	{
		.name = STM32_MBX_VQ0,
		.vq_id = STM32_MBX_VQ0_ID,
		.client = {
			.rx_callback = stm32_rproc_mb_callback,
			.tx_block = false,
		},
	},
	{
		.name = STM32_MBX_VQ1,
		.vq_id = STM32_MBX_VQ1_ID,
		.client = {
			.rx_callback = stm32_rproc_mb_callback,
			.tx_block = false,
		},
	},
	{
		.name = STM32_MBX_SHUTDOWN,
		.vq_id = -1,
		.client = {
			.tx_block = true,
			.tx_done = NULL,
			.tx_tout = 500, /* 500 ms time out */
		},
	}
};

static int stm32_rproc_request_mbox(struct rproc *rproc)
{
	struct stm32_rproc *ddata = rproc->priv;
	struct device *dev = &rproc->dev;
	unsigned int i;
	int j;
	const unsigned char *name;
	struct mbox_client *cl;

	/* Initialise mailbox structure table */
	memcpy(ddata->mb, stm32_rproc_mbox, sizeof(stm32_rproc_mbox));

	for (i = 0; i < MBOX_NB_MBX; i++) {
		name = ddata->mb[i].name;

		cl = &ddata->mb[i].client;
		cl->dev = dev->parent;

		ddata->mb[i].chan = mbox_request_channel_byname(cl, name);
		if (IS_ERR(ddata->mb[i].chan)) {
			if (PTR_ERR(ddata->mb[i].chan) == -EPROBE_DEFER)
				goto err_probe;
			dev_warn(dev, "cannot get %s mbox\n", name);
			ddata->mb[i].chan = NULL;
		}
		if (ddata->mb[i].vq_id >= 0) {
			INIT_WORK(&ddata->mb[i].vq_work,
				  stm32_rproc_mb_vq_work);
		}
	}

	return 0;

err_probe:
	for (j = i - 1; j >= 0; j--)
		if (ddata->mb[j].chan)
			mbox_free_channel(ddata->mb[j].chan);
	return -EPROBE_DEFER;
}

static int stm32_rproc_set_hold_boot(struct rproc *rproc, bool hold)
{
	struct stm32_rproc *ddata = rproc->priv;
	struct stm32_syscon hold_boot = ddata->hold_boot;
	struct arm_smccc_res smc_res;
	int val, err;

	val = hold ? HOLD_BOOT : RELEASE_BOOT;

	if (IS_ENABLED(CONFIG_HAVE_ARM_SMCCC) && ddata->secured_soc) {
		arm_smccc_smc(STM32_SMC_RCC, STM32_SMC_REG_WRITE,
			      hold_boot.reg, val, 0, 0, 0, 0, &smc_res);
		err = smc_res.a0;
	} else {
		err = regmap_update_bits(hold_boot.map, hold_boot.reg,
					 hold_boot.mask, val);
	}

	if (err)
		dev_err(&rproc->dev, "failed to set hold boot\n");

	return err;
}

static void stm32_rproc_add_coredump_trace(struct rproc *rproc)
{
	struct rproc_debug_trace *trace;
	struct rproc_dump_segment *segment;
	bool already_added;

	list_for_each_entry(trace, &rproc->traces, node) {
		already_added = false;

		list_for_each_entry(segment, &rproc->dump_segments, node) {
			if (segment->da == trace->trace_mem.da) {
				already_added = true;
				break;
			}
		}

		if (!already_added)
			rproc_coredump_add_segment(rproc, trace->trace_mem.da,
						   trace->trace_mem.len);
	}
}

static int stm32_rproc_start(struct rproc *rproc)
{
	struct stm32_rproc *ddata = rproc->priv;
	int err;

	stm32_rproc_add_coredump_trace(rproc);

	/* clear remote proc Deep Sleep */
	if (ddata->pdds.map) {
		err = regmap_update_bits(ddata->pdds.map, ddata->pdds.reg,
					 ddata->pdds.mask, 0);
		if (err) {
			dev_err(&rproc->dev, "failed to clear pdds\n");
			return err;
		}
	}

	err = stm32_rproc_set_hold_boot(rproc, false);
	if (err)
		return err;

	return stm32_rproc_set_hold_boot(rproc, true);
}

static int stm32_rproc_stop(struct rproc *rproc)
{
	struct stm32_rproc *ddata = rproc->priv;
	int err, dummy_data, idx;

	/* request shutdown of the remote processor */
	if (rproc->state != RPROC_OFFLINE) {
		idx = stm32_rproc_mbox_idx(rproc, STM32_MBX_SHUTDOWN);
		if (idx >= 0 && ddata->mb[idx].chan) {
			/* a dummy data is sent to allow to block on transmit */
			err = mbox_send_message(ddata->mb[idx].chan,
						&dummy_data);
			if (err < 0)
				dev_warn(&rproc->dev, "warning: remote FW shutdown without ack\n");
		}
	}

	err = stm32_rproc_set_hold_boot(rproc, true);
	if (err)
		return err;

	err = reset_control_assert(ddata->rst);
	if (err) {
		dev_err(&rproc->dev, "failed to assert the reset\n");
		return err;
	}

	/* to allow platform Standby power mode, set remote proc Deep Sleep */
	if (ddata->pdds.map) {
		err = regmap_update_bits(ddata->pdds.map, ddata->pdds.reg,
					 ddata->pdds.mask, 1);
		if (err) {
			dev_err(&rproc->dev, "failed to set pdds\n");
			return err;
		}
	}

	return 0;
}

static void stm32_rproc_kick(struct rproc *rproc, int vqid)
{
	struct stm32_rproc *ddata = rproc->priv;
	unsigned int i;
	int err;

	if (WARN_ON(vqid >= MBOX_NB_VQ))
		return;

	for (i = 0; i < MBOX_NB_MBX; i++) {
		if (vqid != ddata->mb[i].vq_id)
			continue;
		if (!ddata->mb[i].chan)
			return;
		err = mbox_send_message(ddata->mb[i].chan, (void *)(long)vqid);
		if (err < 0)
			dev_err(&rproc->dev, "%s: failed (%s, err:%d)\n",
				__func__, ddata->mb[i].name, err);
		return;
	}
}

static struct rproc_ops st_rproc_ops = {
	.start		= stm32_rproc_start,
	.stop		= stm32_rproc_stop,
	.kick		= stm32_rproc_kick,
	.load		= rproc_elf_load_segments,
	.parse_fw	= stm32_rproc_parse_fw,
	.find_loaded_rsc_table = rproc_elf_find_loaded_rsc_table,
	.sanity_check	= rproc_elf32_sanity_check,
	.get_boot_addr	= rproc_elf_get_boot_addr,
};

static const struct of_device_id stm32_rproc_match[] = {
	{ .compatible = "st,stm32mp1-m4" },
	{},
};
MODULE_DEVICE_TABLE(of, stm32_rproc_match);

static int stm32_rproc_get_syscon(struct device_node *np, const char *prop,
				  struct stm32_syscon *syscon)
{
	int err = 0;

	syscon->map = syscon_regmap_lookup_by_phandle(np, prop);
	if (IS_ERR(syscon->map)) {
		err = PTR_ERR(syscon->map);
		syscon->map = NULL;
		goto out;
	}

	err = of_property_read_u32_index(np, prop, 1, &syscon->reg);
	if (err)
		goto out;

	err = of_property_read_u32_index(np, prop, 2, &syscon->mask);

out:
	return err;
}

static int stm32_rproc_parse_dt(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	struct device_node *np = dev->of_node;
	struct rproc *rproc = platform_get_drvdata(pdev);
	struct stm32_rproc *ddata = rproc->priv;
	struct stm32_syscon tz;
	unsigned int tzen;
	int err, irq;

	irq = platform_get_irq(pdev, 0);
	if (irq == -EPROBE_DEFER)
		return -EPROBE_DEFER;

	if (irq > 0) {
		err = devm_request_irq(dev, irq, stm32_rproc_wdg, 0,
				       dev_name(dev), rproc);
		if (err) {
			dev_err(dev, "failed to request wdg irq\n");
			return err;
		}

		ddata->wdg_irq = irq;

		if (of_property_read_bool(np, "wakeup-source")) {
			device_init_wakeup(dev, true);
			dev_pm_set_wake_irq(dev, irq);
		}

		dev_info(dev, "wdg irq registered\n");
	}

	ddata->rst = devm_reset_control_get_by_index(dev, 0);
	if (IS_ERR(ddata->rst)) {
		dev_err(dev, "failed to get mcu reset\n");
		return PTR_ERR(ddata->rst);
	}

	/*
	 * if platform is secured the hold boot bit must be written by
	 * smc call and read normally.
	 * if not secure the hold boot bit could be read/write normally
	 */
	err = stm32_rproc_get_syscon(np, "st,syscfg-tz", &tz);
	if (err) {
		dev_err(dev, "failed to get tz syscfg\n");
		return err;
	}

	err = regmap_read(tz.map, tz.reg, &tzen);
	if (err) {
		dev_err(&rproc->dev, "failed to read tzen\n");
		return err;
	}
	ddata->secured_soc = tzen & tz.mask;

	err = stm32_rproc_get_syscon(np, "st,syscfg-holdboot",
				     &ddata->hold_boot);
	if (err) {
		dev_err(dev, "failed to get hold boot\n");
		return err;
	}

	err = stm32_rproc_get_syscon(np, "st,syscfg-pdds", &ddata->pdds);
	if (err)
		dev_info(dev, "failed to get pdds\n");

	rproc->auto_boot = of_property_read_bool(np, "st,auto-boot");

	return stm32_rproc_of_memory_translations(rproc);
}

static int stm32_rproc_probe(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	struct stm32_rproc *ddata;
	struct device_node *np = dev->of_node;
	struct rproc *rproc;
	int ret;

	ret = dma_coerce_mask_and_coherent(dev, DMA_BIT_MASK(32));
	if (ret)
		return ret;

	rproc = rproc_alloc(dev, np->name, &st_rproc_ops, NULL, sizeof(*ddata));
	if (!rproc)
		return -ENOMEM;

	rproc->has_iommu = false;
	ddata = rproc->priv;
	ddata->workqueue = create_workqueue(dev_name(dev));
	if (!ddata->workqueue) {
		dev_err(dev, "cannot create workqueue\n");
		ret = -ENOMEM;
		goto free_rproc;
	}

	platform_set_drvdata(pdev, rproc);

	ret = stm32_rproc_parse_dt(pdev);
	if (ret)
		goto free_wkq;

	ret = stm32_rproc_request_mbox(rproc);
	if (ret)
		goto free_rproc;

	ret = rproc_add(rproc);
	if (ret)
		goto free_mb;

	return 0;

free_mb:
	stm32_rproc_free_mbox(rproc);
free_wkq:
	destroy_workqueue(ddata->workqueue);
free_rproc:
	if (device_may_wakeup(dev)) {
		dev_pm_clear_wake_irq(dev);
		device_init_wakeup(dev, false);
	}
	rproc_free(rproc);
	return ret;
}

static int stm32_rproc_remove(struct platform_device *pdev)
{
	struct rproc *rproc = platform_get_drvdata(pdev);
	struct stm32_rproc *ddata = rproc->priv;
	struct device *dev = &pdev->dev;

	if (atomic_read(&rproc->power) > 0)
		rproc_shutdown(rproc);

	rproc_del(rproc);
	stm32_rproc_free_mbox(rproc);
	destroy_workqueue(ddata->workqueue);

	if (device_may_wakeup(dev)) {
		dev_pm_clear_wake_irq(dev);
		device_init_wakeup(dev, false);
	}
	rproc_free(rproc);

	return 0;
}

static int __maybe_unused stm32_rproc_suspend(struct device *dev)
{
	struct rproc *rproc = dev_get_drvdata(dev);
	struct stm32_rproc *ddata = rproc->priv;

	if (device_may_wakeup(dev))
		return enable_irq_wake(ddata->wdg_irq);

	return 0;
}

static int __maybe_unused stm32_rproc_resume(struct device *dev)
{
	struct rproc *rproc = dev_get_drvdata(dev);
	struct stm32_rproc *ddata = rproc->priv;

	if (device_may_wakeup(dev))
		return disable_irq_wake(ddata->wdg_irq);

	return 0;
}

static SIMPLE_DEV_PM_OPS(stm32_rproc_pm_ops,
			 stm32_rproc_suspend, stm32_rproc_resume);

static struct platform_driver stm32_rproc_driver = {
	.probe = stm32_rproc_probe,
	.remove = stm32_rproc_remove,
	.driver = {
		.name = "stm32-rproc",
		.pm = &stm32_rproc_pm_ops,
		.of_match_table = of_match_ptr(stm32_rproc_match),
	},
};
module_platform_driver(stm32_rproc_driver);

MODULE_DESCRIPTION("STM32 Remote Processor Control Driver");
MODULE_AUTHOR("Ludovic Barre <ludovic.barre@st.com>");
MODULE_AUTHOR("Fabien Dessenne <fabien.dessenne@st.com>");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
13140de0 FD	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>
410119ee	18	#include <linux/pm_wakeirq.h>
13140de0 FD	19	#include <linux/regmap.h>
	20	#include <linux/remoteproc.h>
	21	#include <linux/reset.h>
714cf5e3	22	#include <linux/workqueue.h>
13140de0 FD	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"
714cf5e3	36	#define STM32_MBX_VQ0_ID 0
13140de0	37	#define STM32_MBX_VQ1 "vq1"
714cf5e3	38	#define STM32_MBX_VQ1_ID 1
13140de0 FD	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;
714cf5e3	65	struct work_struct vq_work;
13140de0 FD	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;
410119ee	73	int wdg_irq;
13140de0 FD	74	u32 nb_rmems;
	75	struct stm32_rproc_mem *rmems;
	76	struct stm32_mbox mb[MBOX_NB_MBX];
714cf5e3	77	struct workqueue_struct *workqueue;
13140de0 FD	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
714cf5e3 AP	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
13140de0 FD	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);
714cf5e3	284	struct stm32_rproc *ddata = rproc->priv;
13140de0	285
714cf5e3	286	queue_work(ddata->workqueue, &mb->vq_work);
13140de0 FD	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,
714cf5e3	304	.vq_id = STM32_MBX_VQ0_ID,
13140de0 FD	305	.client = {
	306	.rx_callback = stm32_rproc_mb_callback,
	307	.tx_block = false,
	308	},
	309	},
	310	{
	311	.name = STM32_MBX_VQ1,
714cf5e3	312	.vq_id = STM32_MBX_VQ1_ID,
13140de0 FD	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
4a56e423	329	static int stm32_rproc_request_mbox(struct rproc *rproc)
13140de0 FD	330	{
	331	struct stm32_rproc *ddata = rproc->priv;
	332	struct device *dev = &rproc->dev;
	333	unsigned int i;
4a56e423	334	int j;
13140de0 FD	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)) {
4a56e423 FD	349	if (PTR_ERR(ddata->mb[i].chan) == -EPROBE_DEFER)
4a56e423 FD	350	goto err_probe;
13140de0 FD	351	dev_warn(dev, "cannot get %s mbox\n", name);
	352	ddata->mb[i].chan = NULL;
	353	}
714cf5e3 AP	354	if (ddata->mb[i].vq_id >= 0) {
	355	INIT_WORK(&ddata->mb[i].vq_work,
	356	stm32_rproc_mb_vq_work);
	357	}
13140de0	358	}
4a56e423 FD	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;
13140de0 FD	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
93f1d3e4	378	if (IS_ENABLED(CONFIG_HAVE_ARM_SMCCC) && ddata->secured_soc) {
13140de0 FD	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	{
abbe429d	417	struct stm32_rproc *ddata = rproc->priv;
13140de0 FD	418	int err;
	419
	420	stm32_rproc_add_coredump_trace(rproc);
	421
abbe429d FD	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
13140de0 FD	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,
826c3390	508	.sanity_check = rproc_elf32_sanity_check,
13140de0 FD	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);
d333de37 FD	551	if (irq == -EPROBE_DEFER)
	552	return -EPROBE_DEFER;
	553
13140de0 FD	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
410119ee FD	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
13140de0 FD	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)
b1f0fa86	605	dev_info(dev, "failed to get pdds\n");
13140de0 FD	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;
714cf5e3 AP	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	}
13140de0 FD	636
	637	platform_set_drvdata(pdev, rproc);
	638
	639	ret = stm32_rproc_parse_dt(pdev);
	640	if (ret)
714cf5e3	641	goto free_wkq;
13140de0	642
4a56e423 FD	643	ret = stm32_rproc_request_mbox(rproc);
	644	if (ret)
	645	goto free_rproc;
13140de0 FD	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);
714cf5e3 AP	655	free_wkq:
714cf5e3 AP	656	destroy_workqueue(ddata->workqueue);
13140de0	657	free_rproc:
410119ee FD	658	if (device_may_wakeup(dev)) {
	659	dev_pm_clear_wake_irq(dev);
	660	device_init_wakeup(dev, false);
	661	}
13140de0 FD	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);
714cf5e3	669	struct stm32_rproc *ddata = rproc->priv;
410119ee	670	struct device *dev = &pdev->dev;
13140de0 FD	671
	672	if (atomic_read(&rproc->power) > 0)
	673	rproc_shutdown(rproc);
	674
	675	rproc_del(rproc);
	676	stm32_rproc_free_mbox(rproc);
714cf5e3	677	destroy_workqueue(ddata->workqueue);
410119ee FD	678
	679	if (device_may_wakeup(dev)) {
	680	dev_pm_clear_wake_irq(dev);
	681	device_init_wakeup(dev, false);
	682	}
13140de0 FD	683	rproc_free(rproc);
	684
	685	return 0;
	686	}
	687
410119ee FD	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
13140de0 FD	713	static struct platform_driver stm32_rproc_driver = {
	714	.probe = stm32_rproc_probe,
	715	.remove = stm32_rproc_remove,
	716	.driver = {
	717	.name = "stm32-rproc",
410119ee	718	.pm = &stm32_rproc_pm_ops,
13140de0 FD	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