[mirror_ubuntu-jammy-kernel.git] / drivers / remoteproc / st_remoteproc.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * ST's Remote Processor Control Driver
 *
 * Copyright (C) 2015 STMicroelectronics - All Rights Reserved
 *
 * Author: Ludovic Barre <ludovic.barre@st.com>
 */

#include <linux/clk.h>
#include <linux/dma-mapping.h>
#include <linux/err.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/mailbox_client.h>
#include <linux/mfd/syscon.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/of_device.h>
#include <linux/of_reserved_mem.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/remoteproc.h>
#include <linux/reset.h>

#include "remoteproc_internal.h"

#define ST_RPROC_VQ0		0
#define ST_RPROC_VQ1		1
#define ST_RPROC_MAX_VRING	2

#define MBOX_RX			0
#define MBOX_TX			1
#define MBOX_MAX		2

struct st_rproc_config {
	bool			sw_reset;
	bool			pwr_reset;
	unsigned long		bootaddr_mask;
};

struct st_rproc {
	struct st_rproc_config	*config;
	struct reset_control	*sw_reset;
	struct reset_control	*pwr_reset;
	struct clk		*clk;
	u32			clk_rate;
	struct regmap		*boot_base;
	u32			boot_offset;
	struct mbox_chan	*mbox_chan[ST_RPROC_MAX_VRING * MBOX_MAX];
	struct mbox_client mbox_client_vq0;
	struct mbox_client mbox_client_vq1;
};

static void st_rproc_mbox_callback(struct device *dev, u32 msg)
{
	struct rproc *rproc = dev_get_drvdata(dev);

	if (rproc_vq_interrupt(rproc, msg) == IRQ_NONE)
		dev_dbg(dev, "no message was found in vqid %d\n", msg);
}

static
void st_rproc_mbox_callback_vq0(struct mbox_client *mbox_client, void *data)
{
	st_rproc_mbox_callback(mbox_client->dev, 0);
}

static
void st_rproc_mbox_callback_vq1(struct mbox_client *mbox_client, void *data)
{
	st_rproc_mbox_callback(mbox_client->dev, 1);
}

static void st_rproc_kick(struct rproc *rproc, int vqid)
{
	struct st_rproc *ddata = rproc->priv;
	struct device *dev = rproc->dev.parent;
	int ret;

	/* send the index of the triggered virtqueue in the mailbox payload */
	if (WARN_ON(vqid >= ST_RPROC_MAX_VRING))
		return;

	ret = mbox_send_message(ddata->mbox_chan[vqid * MBOX_MAX + MBOX_TX],
				(void *)&vqid);
	if (ret < 0)
		dev_err(dev, "failed to send message via mbox: %d\n", ret);
}

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

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

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

	return 0;
}

static int st_rproc_mem_release(struct rproc *rproc,
				struct rproc_mem_entry *mem)
{
	iounmap(mem->va);

	return 0;
}

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

	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;
		}

		/*  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, rmem->base,
						   st_rproc_mem_alloc,
						   st_rproc_mem_release,
						   it.node->name);
		} else {
			/* Register reserved memory for vdev buffer allocation */
			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 rproc_elf_load_rsc_table(rproc, fw);
}

static int st_rproc_start(struct rproc *rproc)
{
	struct st_rproc *ddata = rproc->priv;
	int err;

	regmap_update_bits(ddata->boot_base, ddata->boot_offset,
			   ddata->config->bootaddr_mask, rproc->bootaddr);

	err = clk_enable(ddata->clk);
	if (err) {
		dev_err(&rproc->dev, "Failed to enable clock\n");
		return err;
	}

	if (ddata->config->sw_reset) {
		err = reset_control_deassert(ddata->sw_reset);
		if (err) {
			dev_err(&rproc->dev, "Failed to deassert S/W Reset\n");
			goto sw_reset_fail;
		}
	}

	if (ddata->config->pwr_reset) {
		err = reset_control_deassert(ddata->pwr_reset);
		if (err) {
			dev_err(&rproc->dev, "Failed to deassert Power Reset\n");
			goto pwr_reset_fail;
		}
	}

	dev_info(&rproc->dev, "Started from 0x%llx\n", rproc->bootaddr);

	return 0;


pwr_reset_fail:
	if (ddata->config->pwr_reset)
		reset_control_assert(ddata->sw_reset);
sw_reset_fail:
	clk_disable(ddata->clk);

	return err;
}

static int st_rproc_stop(struct rproc *rproc)
{
	struct st_rproc *ddata = rproc->priv;
	int sw_err = 0, pwr_err = 0;

	if (ddata->config->sw_reset) {
		sw_err = reset_control_assert(ddata->sw_reset);
		if (sw_err)
			dev_err(&rproc->dev, "Failed to assert S/W Reset\n");
	}

	if (ddata->config->pwr_reset) {
		pwr_err = reset_control_assert(ddata->pwr_reset);
		if (pwr_err)
			dev_err(&rproc->dev, "Failed to assert Power Reset\n");
	}

	clk_disable(ddata->clk);

	return sw_err ?: pwr_err;
}

static const struct rproc_ops st_rproc_ops = {
	.kick			= st_rproc_kick,
	.start			= st_rproc_start,
	.stop			= st_rproc_stop,
	.parse_fw		= st_rproc_parse_fw,
	.load			= rproc_elf_load_segments,
	.find_loaded_rsc_table	= rproc_elf_find_loaded_rsc_table,
	.sanity_check		= rproc_elf_sanity_check,
	.get_boot_addr		= rproc_elf_get_boot_addr,
};

/*
 * Fetch state of the processor: 0 is off, 1 is on.
 */
static int st_rproc_state(struct platform_device *pdev)
{
	struct rproc *rproc = platform_get_drvdata(pdev);
	struct st_rproc *ddata = rproc->priv;
	int reset_sw = 0, reset_pwr = 0;

	if (ddata->config->sw_reset)
		reset_sw = reset_control_status(ddata->sw_reset);

	if (ddata->config->pwr_reset)
		reset_pwr = reset_control_status(ddata->pwr_reset);

	if (reset_sw < 0 || reset_pwr < 0)
		return -EINVAL;

	return !reset_sw && !reset_pwr;
}

static const struct st_rproc_config st40_rproc_cfg = {
	.sw_reset = true,
	.pwr_reset = true,
	.bootaddr_mask = GENMASK(28, 1),
};

static const struct st_rproc_config st231_rproc_cfg = {
	.sw_reset = true,
	.pwr_reset = false,
	.bootaddr_mask = GENMASK(31, 6),
};

static const struct of_device_id st_rproc_match[] = {
	{ .compatible = "st,st40-rproc", .data = &st40_rproc_cfg },
	{ .compatible = "st,st231-rproc", .data = &st231_rproc_cfg },
	{},
};
MODULE_DEVICE_TABLE(of, st_rproc_match);

static int st_rproc_parse_dt(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	struct rproc *rproc = platform_get_drvdata(pdev);
	struct st_rproc *ddata = rproc->priv;
	struct device_node *np = dev->of_node;
	int err;

	if (ddata->config->sw_reset) {
		ddata->sw_reset = devm_reset_control_get_exclusive(dev,
								   "sw_reset");
		if (IS_ERR(ddata->sw_reset)) {
			dev_err(dev, "Failed to get S/W Reset\n");
			return PTR_ERR(ddata->sw_reset);
		}
	}

	if (ddata->config->pwr_reset) {
		ddata->pwr_reset = devm_reset_control_get_exclusive(dev,
								    "pwr_reset");
		if (IS_ERR(ddata->pwr_reset)) {
			dev_err(dev, "Failed to get Power Reset\n");
			return PTR_ERR(ddata->pwr_reset);
		}
	}

	ddata->clk = devm_clk_get(dev, NULL);
	if (IS_ERR(ddata->clk)) {
		dev_err(dev, "Failed to get clock\n");
		return PTR_ERR(ddata->clk);
	}

	err = of_property_read_u32(np, "clock-frequency", &ddata->clk_rate);
	if (err) {
		dev_err(dev, "failed to get clock frequency\n");
		return err;
	}

	ddata->boot_base = syscon_regmap_lookup_by_phandle(np, "st,syscfg");
	if (IS_ERR(ddata->boot_base)) {
		dev_err(dev, "Boot base not found\n");
		return PTR_ERR(ddata->boot_base);
	}

	err = of_property_read_u32_index(np, "st,syscfg", 1,
					 &ddata->boot_offset);
	if (err) {
		dev_err(dev, "Boot offset not found\n");
		return -EINVAL;
	}

	err = clk_prepare(ddata->clk);
	if (err)
		dev_err(dev, "failed to get clock\n");

	return err;
}

static int st_rproc_probe(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	const struct of_device_id *match;
	struct st_rproc *ddata;
	struct device_node *np = dev->of_node;
	struct rproc *rproc;
	struct mbox_chan *chan;
	int enabled;
	int ret, i;

	match = of_match_device(st_rproc_match, dev);
	if (!match || !match->data) {
		dev_err(dev, "No device match found\n");
		return -ENODEV;
	}

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

	rproc->has_iommu = false;
	ddata = rproc->priv;
	ddata->config = (struct st_rproc_config *)match->data;

	platform_set_drvdata(pdev, rproc);

	ret = st_rproc_parse_dt(pdev);
	if (ret)
		goto free_rproc;

	enabled = st_rproc_state(pdev);
	if (enabled < 0) {
		ret = enabled;
		goto free_clk;
	}

	if (enabled) {
		atomic_inc(&rproc->power);
		rproc->state = RPROC_RUNNING;
	} else {
		clk_set_rate(ddata->clk, ddata->clk_rate);
	}

	if (of_get_property(np, "mbox-names", NULL)) {
		ddata->mbox_client_vq0.dev		= dev;
		ddata->mbox_client_vq0.tx_done		= NULL;
		ddata->mbox_client_vq0.tx_block	= false;
		ddata->mbox_client_vq0.knows_txdone	= false;
		ddata->mbox_client_vq0.rx_callback	= st_rproc_mbox_callback_vq0;

		ddata->mbox_client_vq1.dev		= dev;
		ddata->mbox_client_vq1.tx_done		= NULL;
		ddata->mbox_client_vq1.tx_block	= false;
		ddata->mbox_client_vq1.knows_txdone	= false;
		ddata->mbox_client_vq1.rx_callback	= st_rproc_mbox_callback_vq1;

		/*
		 * To control a co-processor without IPC mechanism.
		 * This driver can be used without mbox and rpmsg.
		 */
		chan = mbox_request_channel_byname(&ddata->mbox_client_vq0, "vq0_rx");
		if (IS_ERR(chan)) {
			dev_err(&rproc->dev, "failed to request mbox chan 0\n");
			ret = PTR_ERR(chan);
			goto free_clk;
		}
		ddata->mbox_chan[ST_RPROC_VQ0 * MBOX_MAX + MBOX_RX] = chan;

		chan = mbox_request_channel_byname(&ddata->mbox_client_vq0, "vq0_tx");
		if (IS_ERR(chan)) {
			dev_err(&rproc->dev, "failed to request mbox chan 0\n");
			ret = PTR_ERR(chan);
			goto free_mbox;
		}
		ddata->mbox_chan[ST_RPROC_VQ0 * MBOX_MAX + MBOX_TX] = chan;

		chan = mbox_request_channel_byname(&ddata->mbox_client_vq1, "vq1_rx");
		if (IS_ERR(chan)) {
			dev_err(&rproc->dev, "failed to request mbox chan 1\n");
			ret = PTR_ERR(chan);
			goto free_mbox;
		}
		ddata->mbox_chan[ST_RPROC_VQ1 * MBOX_MAX + MBOX_RX] = chan;

		chan = mbox_request_channel_byname(&ddata->mbox_client_vq1, "vq1_tx");
		if (IS_ERR(chan)) {
			dev_err(&rproc->dev, "failed to request mbox chan 1\n");
			ret = PTR_ERR(chan);
			goto free_mbox;
		}
		ddata->mbox_chan[ST_RPROC_VQ1 * MBOX_MAX + MBOX_TX] = chan;
	}

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

	return 0;

free_mbox:
	for (i = 0; i < ST_RPROC_MAX_VRING * MBOX_MAX; i++)
		mbox_free_channel(ddata->mbox_chan[i]);
free_clk:
	clk_unprepare(ddata->clk);
free_rproc:
	rproc_free(rproc);
	return ret;
}

static int st_rproc_remove(struct platform_device *pdev)
{
	struct rproc *rproc = platform_get_drvdata(pdev);
	struct st_rproc *ddata = rproc->priv;
	int i;

	rproc_del(rproc);

	clk_disable_unprepare(ddata->clk);

	for (i = 0; i < ST_RPROC_MAX_VRING * MBOX_MAX; i++)
		mbox_free_channel(ddata->mbox_chan[i]);

	rproc_free(rproc);

	return 0;
}

static struct platform_driver st_rproc_driver = {
	.probe = st_rproc_probe,
	.remove = st_rproc_remove,
	.driver = {
		.name = "st-rproc",
		.of_match_table = of_match_ptr(st_rproc_match),
	},
};
module_platform_driver(st_rproc_driver);

MODULE_DESCRIPTION("ST Remote Processor Control Driver");
MODULE_AUTHOR("Ludovic Barre <ludovic.barre@st.com>");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
d2912cb1	1	// SPDX-License-Identifier: GPL-2.0-only
63edb031 LJ	2	/*
	3	* ST's Remote Processor Control Driver
	4	*
	5	* Copyright (C) 2015 STMicroelectronics - All Rights Reserved
	6	*
	7	* Author: Ludovic Barre <ludovic.barre@st.com>
63edb031 LJ	8	*/
	9
	10	#include <linux/clk.h>
	11	#include <linux/dma-mapping.h>
	12	#include <linux/err.h>
	13	#include <linux/interrupt.h>
	14	#include <linux/kernel.h>
231c8dfd	15	#include <linux/mailbox_client.h>
63edb031 LJ	16	#include <linux/mfd/syscon.h>
	17	#include <linux/module.h>
	18	#include <linux/of.h>
3df52ed7	19	#include <linux/of_address.h>
63edb031 LJ	20	#include <linux/of_device.h>
	21	#include <linux/of_reserved_mem.h>
	22	#include <linux/platform_device.h>
	23	#include <linux/regmap.h>
	24	#include <linux/remoteproc.h>
	25	#include <linux/reset.h>
	26
231c8dfd LP	27	#include "remoteproc_internal.h"
	28
	29	#define ST_RPROC_VQ0 0
	30	#define ST_RPROC_VQ1 1
	31	#define ST_RPROC_MAX_VRING 2
	32
	33	#define MBOX_RX 0
	34	#define MBOX_TX 1
	35	#define MBOX_MAX 2
	36
63edb031 LJ	37	struct st_rproc_config {
	38	bool sw_reset;
	39	bool pwr_reset;
	40	unsigned long bootaddr_mask;
	41	};
	42
	43	struct st_rproc {
	44	struct st_rproc_config *config;
	45	struct reset_control *sw_reset;
	46	struct reset_control *pwr_reset;
	47	struct clk *clk;
	48	u32 clk_rate;
	49	struct regmap *boot_base;
	50	u32 boot_offset;
231c8dfd LP	51	struct mbox_chan mbox_chan[ST_RPROC_MAX_VRING MBOX_MAX];
	52	struct mbox_client mbox_client_vq0;
	53	struct mbox_client mbox_client_vq1;
63edb031 LJ	54	};
63edb031 LJ	55
231c8dfd LP	56	static void st_rproc_mbox_callback(struct device *dev, u32 msg)
	57	{
	58	struct rproc *rproc = dev_get_drvdata(dev);
	59
	60	if (rproc_vq_interrupt(rproc, msg) == IRQ_NONE)
	61	dev_dbg(dev, "no message was found in vqid %d\n", msg);
	62	}
	63
	64	static
	65	void st_rproc_mbox_callback_vq0(struct mbox_client mbox_client, void data)
	66	{
	67	st_rproc_mbox_callback(mbox_client->dev, 0);
	68	}
	69
	70	static
	71	void st_rproc_mbox_callback_vq1(struct mbox_client mbox_client, void data)
	72	{
	73	st_rproc_mbox_callback(mbox_client->dev, 1);
	74	}
	75
	76	static void st_rproc_kick(struct rproc *rproc, int vqid)
	77	{
	78	struct st_rproc *ddata = rproc->priv;
	79	struct device *dev = rproc->dev.parent;
	80	int ret;
	81
	82	/* send the index of the triggered virtqueue in the mailbox payload */
	83	if (WARN_ON(vqid >= ST_RPROC_MAX_VRING))
	84	return;
	85
	86	ret = mbox_send_message(ddata->mbox_chan[vqid * MBOX_MAX + MBOX_TX],
	87	(void *)&vqid);
	88	if (ret < 0)
	89	dev_err(dev, "failed to send message via mbox: %d\n", ret);
	90	}
	91
3df52ed7 LP	92	static int st_rproc_mem_alloc(struct rproc *rproc,
	93	struct rproc_mem_entry *mem)
	94	{
	95	struct device *dev = rproc->dev.parent;
	96	void *va;
	97
	98	va = ioremap_wc(mem->dma, mem->len);
	99	if (!va) {
	100	dev_err(dev, "Unable to map memory region: %pa+%zx\n",
	101	&mem->dma, mem->len);
	102	return -ENOMEM;
	103	}
	104
	105	/* Update memory entry va */
	106	mem->va = va;
	107
	108	return 0;
	109	}
	110
	111	static int st_rproc_mem_release(struct rproc *rproc,
	112	struct rproc_mem_entry *mem)
	113	{
	114	iounmap(mem->va);
	115
	116	return 0;
	117	}
	118
	119	static int st_rproc_parse_fw(struct rproc rproc, const struct firmware fw)
	120	{
	121	struct device *dev = rproc->dev.parent;
	122	struct device_node *np = dev->of_node;
	123	struct rproc_mem_entry *mem;
	124	struct reserved_mem *rmem;
	125	struct of_phandle_iterator it;
	126	int index = 0;
	127
	128	of_phandle_iterator_init(&it, np, "memory-region", NULL, 0);
	129	while (of_phandle_iterator_next(&it) == 0) {
	130	rmem = of_reserved_mem_lookup(it.node);
	131	if (!rmem) {
	132	dev_err(dev, "unable to acquire memory-region\n");
	133	return -EINVAL;
	134	}
	135
	136	/* No need to map vdev buffer */
	137	if (strcmp(it.node->name, "vdev0buffer")) {
	138	/* Register memory region */
	139	mem = rproc_mem_entry_init(dev, NULL,
	140	(dma_addr_t)rmem->base,
	141	rmem->size, rmem->base,
	142	st_rproc_mem_alloc,
	143	st_rproc_mem_release,
	144	it.node->name);
	145	} else {
	146	/* Register reserved memory for vdev buffer allocation */
	147	mem = rproc_of_resm_mem_entry_init(dev, index,
	148	rmem->size,
	149	rmem->base,
	150	it.node->name);
	151	}
	152
	153	if (!mem)
	154	return -ENOMEM;
	155
156	rproc_add_carveout(rproc, mem);
157	index++;
158	}
159
160	return rproc_elf_load_rsc_table(rproc, fw);
161	}
162
63edb031 LJ	163	static int st_rproc_start(struct rproc *rproc)
	164	{
	165	struct st_rproc *ddata = rproc->priv;
	166	int err;
	167
	168	regmap_update_bits(ddata->boot_base, ddata->boot_offset,
	169	ddata->config->bootaddr_mask, rproc->bootaddr);
	170
	171	err = clk_enable(ddata->clk);
	172	if (err) {
	173	dev_err(&rproc->dev, "Failed to enable clock\n");
	174	return err;
	175	}
	176
	177	if (ddata->config->sw_reset) {
	178	err = reset_control_deassert(ddata->sw_reset);
	179	if (err) {
	180	dev_err(&rproc->dev, "Failed to deassert S/W Reset\n");
	181	goto sw_reset_fail;
	182	}
	183	}
	184
	185	if (ddata->config->pwr_reset) {
	186	err = reset_control_deassert(ddata->pwr_reset);
	187	if (err) {
	188	dev_err(&rproc->dev, "Failed to deassert Power Reset\n");
	189	goto pwr_reset_fail;
	190	}
	191	}
	192
e4ae4b7d	193	dev_info(&rproc->dev, "Started from 0x%llx\n", rproc->bootaddr);
63edb031 LJ	194
	195	return 0;
	196
	197
	198	pwr_reset_fail:
	199	if (ddata->config->pwr_reset)
	200	reset_control_assert(ddata->sw_reset);
	201	sw_reset_fail:
	202	clk_disable(ddata->clk);
	203
	204	return err;
	205	}
	206
	207	static int st_rproc_stop(struct rproc *rproc)
	208	{
	209	struct st_rproc *ddata = rproc->priv;
	210	int sw_err = 0, pwr_err = 0;
	211
	212	if (ddata->config->sw_reset) {
	213	sw_err = reset_control_assert(ddata->sw_reset);
	214	if (sw_err)
	215	dev_err(&rproc->dev, "Failed to assert S/W Reset\n");
	216	}
	217
	218	if (ddata->config->pwr_reset) {
	219	pwr_err = reset_control_assert(ddata->pwr_reset);
	220	if (pwr_err)
	221	dev_err(&rproc->dev, "Failed to assert Power Reset\n");
	222	}
	223
	224	clk_disable(ddata->clk);
	225
	226	return sw_err ?: pwr_err;
	227	}
	228
c008fad2	229	static const struct rproc_ops st_rproc_ops = {
3df52ed7 LP	230	.kick = st_rproc_kick,
	231	.start = st_rproc_start,
	232	.stop = st_rproc_stop,
	233	.parse_fw = st_rproc_parse_fw,
	234	.load = rproc_elf_load_segments,
	235	.find_loaded_rsc_table = rproc_elf_find_loaded_rsc_table,
e29ff72b	236	.sanity_check = rproc_elf_sanity_check,
3df52ed7	237	.get_boot_addr = rproc_elf_get_boot_addr,
63edb031 LJ	238	};
	239
	240	/*
	241	* Fetch state of the processor: 0 is off, 1 is on.
	242	*/
	243	static int st_rproc_state(struct platform_device *pdev)
	244	{
	245	struct rproc *rproc = platform_get_drvdata(pdev);
	246	struct st_rproc *ddata = rproc->priv;
	247	int reset_sw = 0, reset_pwr = 0;
	248
	249	if (ddata->config->sw_reset)
	250	reset_sw = reset_control_status(ddata->sw_reset);
	251
	252	if (ddata->config->pwr_reset)
	253	reset_pwr = reset_control_status(ddata->pwr_reset);
	254
	255	if (reset_sw < 0 \|\| reset_pwr < 0)
	256	return -EINVAL;
	257
	258	return !reset_sw && !reset_pwr;
	259	}
	260
	261	static const struct st_rproc_config st40_rproc_cfg = {
	262	.sw_reset = true,
	263	.pwr_reset = true,
	264	.bootaddr_mask = GENMASK(28, 1),
	265	};
	266
	267	static const struct st_rproc_config st231_rproc_cfg = {
	268	.sw_reset = true,
	269	.pwr_reset = false,
	270	.bootaddr_mask = GENMASK(31, 6),
	271	};
	272
	273	static const struct of_device_id st_rproc_match[] = {
	274	{ .compatible = "st,st40-rproc", .data = &st40_rproc_cfg },
	275	{ .compatible = "st,st231-rproc", .data = &st231_rproc_cfg },
	276	{},
	277	};
	278	MODULE_DEVICE_TABLE(of, st_rproc_match);
	279
	280	static int st_rproc_parse_dt(struct platform_device *pdev)
	281	{
	282	struct device *dev = &pdev->dev;
	283	struct rproc *rproc = platform_get_drvdata(pdev);
	284	struct st_rproc *ddata = rproc->priv;
	285	struct device_node *np = dev->of_node;
	286	int err;
	287
	288	if (ddata->config->sw_reset) {
1e13c7fb PZ	289	ddata->sw_reset = devm_reset_control_get_exclusive(dev,
1e13c7fb PZ	290	"sw_reset");
63edb031 LJ	291	if (IS_ERR(ddata->sw_reset)) {
	292	dev_err(dev, "Failed to get S/W Reset\n");
	293	return PTR_ERR(ddata->sw_reset);
	294	}
	295	}
	296
	297	if (ddata->config->pwr_reset) {
1e13c7fb PZ	298	ddata->pwr_reset = devm_reset_control_get_exclusive(dev,
1e13c7fb PZ	299	"pwr_reset");
63edb031 LJ	300	if (IS_ERR(ddata->pwr_reset)) {
	301	dev_err(dev, "Failed to get Power Reset\n");
	302	return PTR_ERR(ddata->pwr_reset);
	303	}
	304	}
	305
	306	ddata->clk = devm_clk_get(dev, NULL);
	307	if (IS_ERR(ddata->clk)) {
	308	dev_err(dev, "Failed to get clock\n");
	309	return PTR_ERR(ddata->clk);
	310	}
	311
	312	err = of_property_read_u32(np, "clock-frequency", &ddata->clk_rate);
	313	if (err) {
	314	dev_err(dev, "failed to get clock frequency\n");
	315	return err;
	316	}
	317
	318	ddata->boot_base = syscon_regmap_lookup_by_phandle(np, "st,syscfg");
4b28038f	319	if (IS_ERR(ddata->boot_base)) {
63edb031	320	dev_err(dev, "Boot base not found\n");
4b28038f	321	return PTR_ERR(ddata->boot_base);
63edb031 LJ	322	}
	323
	324	err = of_property_read_u32_index(np, "st,syscfg", 1,
	325	&ddata->boot_offset);
	326	if (err) {
	327	dev_err(dev, "Boot offset not found\n");
	328	return -EINVAL;
	329	}
	330
63edb031 LJ	331	err = clk_prepare(ddata->clk);
	332	if (err)
	333	dev_err(dev, "failed to get clock\n");
	334
	335	return err;
	336	}
	337
	338	static int st_rproc_probe(struct platform_device *pdev)
	339	{
	340	struct device *dev = &pdev->dev;
	341	const struct of_device_id *match;
	342	struct st_rproc *ddata;
	343	struct device_node *np = dev->of_node;
	344	struct rproc *rproc;
231c8dfd	345	struct mbox_chan *chan;
63edb031	346	int enabled;
231c8dfd	347	int ret, i;
63edb031 LJ	348
	349	match = of_match_device(st_rproc_match, dev);
	350	if (!match \|\| !match->data) {
	351	dev_err(dev, "No device match found\n");
	352	return -ENODEV;
	353	}
	354
	355	rproc = rproc_alloc(dev, np->name, &st_rproc_ops, NULL, sizeof(*ddata));
	356	if (!rproc)
	357	return -ENOMEM;
	358
	359	rproc->has_iommu = false;
	360	ddata = rproc->priv;
	361	ddata->config = (struct st_rproc_config *)match->data;
	362
	363	platform_set_drvdata(pdev, rproc);
	364
	365	ret = st_rproc_parse_dt(pdev);
	366	if (ret)
	367	goto free_rproc;
	368
	369	enabled = st_rproc_state(pdev);
1d701d3d WY	370	if (enabled < 0) {
1d701d3d WY	371	ret = enabled;
3e49ecf6	372	goto free_clk;
1d701d3d	373	}
63edb031 LJ	374
	375	if (enabled) {
	376	atomic_inc(&rproc->power);
	377	rproc->state = RPROC_RUNNING;
	378	} else {
	379	clk_set_rate(ddata->clk, ddata->clk_rate);
	380	}
	381
231c8dfd LP	382	if (of_get_property(np, "mbox-names", NULL)) {
	383	ddata->mbox_client_vq0.dev = dev;
	384	ddata->mbox_client_vq0.tx_done = NULL;
	385	ddata->mbox_client_vq0.tx_block = false;
	386	ddata->mbox_client_vq0.knows_txdone = false;
	387	ddata->mbox_client_vq0.rx_callback = st_rproc_mbox_callback_vq0;
	388
	389	ddata->mbox_client_vq1.dev = dev;
	390	ddata->mbox_client_vq1.tx_done = NULL;
	391	ddata->mbox_client_vq1.tx_block = false;
	392	ddata->mbox_client_vq1.knows_txdone = false;
	393	ddata->mbox_client_vq1.rx_callback = st_rproc_mbox_callback_vq1;
	394
	395	/*
	396	* To control a co-processor without IPC mechanism.
	397	* This driver can be used without mbox and rpmsg.
	398	*/
	399	chan = mbox_request_channel_byname(&ddata->mbox_client_vq0, "vq0_rx");
	400	if (IS_ERR(chan)) {
	401	dev_err(&rproc->dev, "failed to request mbox chan 0\n");
	402	ret = PTR_ERR(chan);
	403	goto free_clk;
	404	}
	405	ddata->mbox_chan[ST_RPROC_VQ0 * MBOX_MAX + MBOX_RX] = chan;
	406
	407	chan = mbox_request_channel_byname(&ddata->mbox_client_vq0, "vq0_tx");
	408	if (IS_ERR(chan)) {
	409	dev_err(&rproc->dev, "failed to request mbox chan 0\n");
	410	ret = PTR_ERR(chan);
	411	goto free_mbox;
	412	}
	413	ddata->mbox_chan[ST_RPROC_VQ0 * MBOX_MAX + MBOX_TX] = chan;
	414
	415	chan = mbox_request_channel_byname(&ddata->mbox_client_vq1, "vq1_rx");
	416	if (IS_ERR(chan)) {
	417	dev_err(&rproc->dev, "failed to request mbox chan 1\n");
	418	ret = PTR_ERR(chan);
	419	goto free_mbox;
	420	}
	421	ddata->mbox_chan[ST_RPROC_VQ1 * MBOX_MAX + MBOX_RX] = chan;
	422
	423	chan = mbox_request_channel_byname(&ddata->mbox_client_vq1, "vq1_tx");
	424	if (IS_ERR(chan)) {
	425	dev_err(&rproc->dev, "failed to request mbox chan 1\n");
	426	ret = PTR_ERR(chan);
	427	goto free_mbox;
	428	}
	429	ddata->mbox_chan[ST_RPROC_VQ1 * MBOX_MAX + MBOX_TX] = chan;
	430	}
	431
63edb031 LJ	432	ret = rproc_add(rproc);
63edb031 LJ	433	if (ret)
231c8dfd	434	goto free_mbox;
63edb031 LJ	435
	436	return 0;
	437
231c8dfd LP	438	free_mbox:
	439	for (i = 0; i < ST_RPROC_MAX_VRING * MBOX_MAX; i++)
	440	mbox_free_channel(ddata->mbox_chan[i]);
3e49ecf6 LP	441	free_clk:
3e49ecf6 LP	442	clk_unprepare(ddata->clk);
63edb031	443	free_rproc:
433c0e04	444	rproc_free(rproc);
63edb031 LJ	445	return ret;
	446	}
	447
	448	static int st_rproc_remove(struct platform_device *pdev)
	449	{
	450	struct rproc *rproc = platform_get_drvdata(pdev);
	451	struct st_rproc *ddata = rproc->priv;
231c8dfd	452	int i;
63edb031 LJ	453
	454	rproc_del(rproc);
	455
	456	clk_disable_unprepare(ddata->clk);
	457
231c8dfd LP	458	for (i = 0; i < ST_RPROC_MAX_VRING * MBOX_MAX; i++)
	459	mbox_free_channel(ddata->mbox_chan[i]);
	460
433c0e04	461	rproc_free(rproc);
63edb031 LJ	462
	463	return 0;
	464	}
	465
	466	static struct platform_driver st_rproc_driver = {
	467	.probe = st_rproc_probe,
	468	.remove = st_rproc_remove,
	469	.driver = {
	470	.name = "st-rproc",
	471	.of_match_table = of_match_ptr(st_rproc_match),
	472	},
	473	};
	474	module_platform_driver(st_rproc_driver);
	475
	476	MODULE_DESCRIPTION("ST Remote Processor Control Driver");
	477	MODULE_AUTHOR("Ludovic Barre <ludovic.barre@st.com>");
	478	MODULE_LICENSE("GPL v2");