[linux.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 <[email protected]>
 */

#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_reserved_mem.h>
#include <linux/platform_device.h>
#include <linux/property.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) {
			of_node_put(it.node);
			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) {
			of_node_put(it.node);
			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;
	struct st_rproc *ddata;
	struct device_node *np = dev->of_node;
	struct rproc *rproc;
	struct mbox_chan *chan;
	int enabled;
	int ret, i;

	rproc = devm_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 *)device_get_match_data(dev);
	if (!ddata->config)
		return -ENODEV;

	platform_set_drvdata(pdev, rproc);

	ret = st_rproc_parse_dt(pdev);
	if (ret)
		return ret;

	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_property_present(np, "mbox-names")) {
		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);

	return ret;
}

static void 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]);
}

static struct platform_driver st_rproc_driver = {
	.probe = st_rproc_probe,
	.remove_new = 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 <[email protected]>");
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 <[email protected]>
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>
63edb031 LJ	19	#include <linux/of_reserved_mem.h>
63edb031 LJ	20	#include <linux/platform_device.h>
5c77ebcd	21	#include <linux/property.h>
63edb031 LJ	22	#include <linux/regmap.h>
	23	#include <linux/remoteproc.h>
	24	#include <linux/reset.h>
	25
231c8dfd LP	26	#include "remoteproc_internal.h"
	27
	28	#define ST_RPROC_VQ0 0
	29	#define ST_RPROC_VQ1 1
	30	#define ST_RPROC_MAX_VRING 2
	31
	32	#define MBOX_RX 0
	33	#define MBOX_TX 1
	34	#define MBOX_MAX 2
	35
63edb031 LJ	36	struct st_rproc_config {
	37	bool sw_reset;
	38	bool pwr_reset;
	39	unsigned long bootaddr_mask;
	40	};
	41
	42	struct st_rproc {
	43	struct st_rproc_config *config;
	44	struct reset_control *sw_reset;
	45	struct reset_control *pwr_reset;
	46	struct clk *clk;
	47	u32 clk_rate;
	48	struct regmap *boot_base;
	49	u32 boot_offset;
231c8dfd LP	50	struct mbox_chan mbox_chan[ST_RPROC_MAX_VRING MBOX_MAX];
	51	struct mbox_client mbox_client_vq0;
	52	struct mbox_client mbox_client_vq1;
63edb031 LJ	53	};
63edb031 LJ	54
231c8dfd LP	55	static void st_rproc_mbox_callback(struct device *dev, u32 msg)
	56	{
	57	struct rproc *rproc = dev_get_drvdata(dev);
	58
	59	if (rproc_vq_interrupt(rproc, msg) == IRQ_NONE)
	60	dev_dbg(dev, "no message was found in vqid %d\n", msg);
	61	}
	62
	63	static
	64	void st_rproc_mbox_callback_vq0(struct mbox_client mbox_client, void data)
	65	{
	66	st_rproc_mbox_callback(mbox_client->dev, 0);
	67	}
	68
	69	static
	70	void st_rproc_mbox_callback_vq1(struct mbox_client mbox_client, void data)
	71	{
	72	st_rproc_mbox_callback(mbox_client->dev, 1);
	73	}
	74
	75	static void st_rproc_kick(struct rproc *rproc, int vqid)
	76	{
	77	struct st_rproc *ddata = rproc->priv;
	78	struct device *dev = rproc->dev.parent;
	79	int ret;
	80
	81	/* send the index of the triggered virtqueue in the mailbox payload */
	82	if (WARN_ON(vqid >= ST_RPROC_MAX_VRING))
	83	return;
	84
	85	ret = mbox_send_message(ddata->mbox_chan[vqid * MBOX_MAX + MBOX_TX],
	86	(void *)&vqid);
	87	if (ret < 0)
	88	dev_err(dev, "failed to send message via mbox: %d\n", ret);
	89	}
	90
3df52ed7 LP	91	static int st_rproc_mem_alloc(struct rproc *rproc,
	92	struct rproc_mem_entry *mem)
	93	{
	94	struct device *dev = rproc->dev.parent;
	95	void *va;
	96
	97	va = ioremap_wc(mem->dma, mem->len);
	98	if (!va) {
	99	dev_err(dev, "Unable to map memory region: %pa+%zx\n",
	100	&mem->dma, mem->len);
	101	return -ENOMEM;
	102	}
	103
	104	/* Update memory entry va */
	105	mem->va = va;
	106
	107	return 0;
	108	}
	109
	110	static int st_rproc_mem_release(struct rproc *rproc,
	111	struct rproc_mem_entry *mem)
	112	{
	113	iounmap(mem->va);
	114
	115	return 0;
	116	}
	117
	118	static int st_rproc_parse_fw(struct rproc rproc, const struct firmware fw)
	119	{
	120	struct device *dev = rproc->dev.parent;
	121	struct device_node *np = dev->of_node;
	122	struct rproc_mem_entry *mem;
	123	struct reserved_mem *rmem;
	124	struct of_phandle_iterator it;
	125	int index = 0;
	126
	127	of_phandle_iterator_init(&it, np, "memory-region", NULL, 0);
	128	while (of_phandle_iterator_next(&it) == 0) {
	129	rmem = of_reserved_mem_lookup(it.node);
	130	if (!rmem) {
8a749189	131	of_node_put(it.node);
3df52ed7 LP	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
8a749189 MP	153	if (!mem) {
8a749189 MP	154	of_node_put(it.node);
3df52ed7	155	return -ENOMEM;
8a749189	156	}
3df52ed7 LP	157
	158	rproc_add_carveout(rproc, mem);
	159	index++;
	160	}
	161
	162	return rproc_elf_load_rsc_table(rproc, fw);
	163	}
	164
63edb031 LJ	165	static int st_rproc_start(struct rproc *rproc)
	166	{
	167	struct st_rproc *ddata = rproc->priv;
	168	int err;
	169
	170	regmap_update_bits(ddata->boot_base, ddata->boot_offset,
	171	ddata->config->bootaddr_mask, rproc->bootaddr);
	172
	173	err = clk_enable(ddata->clk);
	174	if (err) {
	175	dev_err(&rproc->dev, "Failed to enable clock\n");
	176	return err;
	177	}
	178
	179	if (ddata->config->sw_reset) {
	180	err = reset_control_deassert(ddata->sw_reset);
	181	if (err) {
	182	dev_err(&rproc->dev, "Failed to deassert S/W Reset\n");
	183	goto sw_reset_fail;
	184	}
	185	}
	186
	187	if (ddata->config->pwr_reset) {
	188	err = reset_control_deassert(ddata->pwr_reset);
	189	if (err) {
	190	dev_err(&rproc->dev, "Failed to deassert Power Reset\n");
	191	goto pwr_reset_fail;
	192	}
	193	}
	194
e4ae4b7d	195	dev_info(&rproc->dev, "Started from 0x%llx\n", rproc->bootaddr);
63edb031 LJ	196
	197	return 0;
	198
	199
	200	pwr_reset_fail:
	201	if (ddata->config->pwr_reset)
	202	reset_control_assert(ddata->sw_reset);
	203	sw_reset_fail:
	204	clk_disable(ddata->clk);
	205
	206	return err;
	207	}
	208
	209	static int st_rproc_stop(struct rproc *rproc)
	210	{
	211	struct st_rproc *ddata = rproc->priv;
	212	int sw_err = 0, pwr_err = 0;
	213
	214	if (ddata->config->sw_reset) {
	215	sw_err = reset_control_assert(ddata->sw_reset);
	216	if (sw_err)
	217	dev_err(&rproc->dev, "Failed to assert S/W Reset\n");
	218	}
	219
	220	if (ddata->config->pwr_reset) {
	221	pwr_err = reset_control_assert(ddata->pwr_reset);
	222	if (pwr_err)
	223	dev_err(&rproc->dev, "Failed to assert Power Reset\n");
	224	}
	225
	226	clk_disable(ddata->clk);
	227
	228	return sw_err ?: pwr_err;
	229	}
	230
c008fad2	231	static const struct rproc_ops st_rproc_ops = {
3df52ed7 LP	232	.kick = st_rproc_kick,
	233	.start = st_rproc_start,
	234	.stop = st_rproc_stop,
	235	.parse_fw = st_rproc_parse_fw,
	236	.load = rproc_elf_load_segments,
	237	.find_loaded_rsc_table = rproc_elf_find_loaded_rsc_table,
e29ff72b	238	.sanity_check = rproc_elf_sanity_check,
3df52ed7	239	.get_boot_addr = rproc_elf_get_boot_addr,
63edb031 LJ	240	};
	241
	242	/*
	243	* Fetch state of the processor: 0 is off, 1 is on.
	244	*/
	245	static int st_rproc_state(struct platform_device *pdev)
	246	{
	247	struct rproc *rproc = platform_get_drvdata(pdev);
	248	struct st_rproc *ddata = rproc->priv;
	249	int reset_sw = 0, reset_pwr = 0;
	250
	251	if (ddata->config->sw_reset)
	252	reset_sw = reset_control_status(ddata->sw_reset);
	253
	254	if (ddata->config->pwr_reset)
	255	reset_pwr = reset_control_status(ddata->pwr_reset);
	256
	257	if (reset_sw < 0 \|\| reset_pwr < 0)
	258	return -EINVAL;
	259
	260	return !reset_sw && !reset_pwr;
	261	}
	262
	263	static const struct st_rproc_config st40_rproc_cfg = {
	264	.sw_reset = true,
	265	.pwr_reset = true,
	266	.bootaddr_mask = GENMASK(28, 1),
	267	};
	268
	269	static const struct st_rproc_config st231_rproc_cfg = {
	270	.sw_reset = true,
	271	.pwr_reset = false,
	272	.bootaddr_mask = GENMASK(31, 6),
	273	};
	274
	275	static const struct of_device_id st_rproc_match[] = {
	276	{ .compatible = "st,st40-rproc", .data = &st40_rproc_cfg },
	277	{ .compatible = "st,st231-rproc", .data = &st231_rproc_cfg },
	278	{},
	279	};
	280	MODULE_DEVICE_TABLE(of, st_rproc_match);
	281
	282	static int st_rproc_parse_dt(struct platform_device *pdev)
	283	{
	284	struct device *dev = &pdev->dev;
	285	struct rproc *rproc = platform_get_drvdata(pdev);
	286	struct st_rproc *ddata = rproc->priv;
	287	struct device_node *np = dev->of_node;
	288	int err;
	289
	290	if (ddata->config->sw_reset) {
1e13c7fb PZ	291	ddata->sw_reset = devm_reset_control_get_exclusive(dev,
1e13c7fb PZ	292	"sw_reset");
63edb031 LJ	293	if (IS_ERR(ddata->sw_reset)) {
	294	dev_err(dev, "Failed to get S/W Reset\n");
	295	return PTR_ERR(ddata->sw_reset);
	296	}
	297	}
	298
	299	if (ddata->config->pwr_reset) {
1e13c7fb PZ	300	ddata->pwr_reset = devm_reset_control_get_exclusive(dev,
1e13c7fb PZ	301	"pwr_reset");
63edb031 LJ	302	if (IS_ERR(ddata->pwr_reset)) {
	303	dev_err(dev, "Failed to get Power Reset\n");
	304	return PTR_ERR(ddata->pwr_reset);
	305	}
	306	}
	307
	308	ddata->clk = devm_clk_get(dev, NULL);
	309	if (IS_ERR(ddata->clk)) {
	310	dev_err(dev, "Failed to get clock\n");
	311	return PTR_ERR(ddata->clk);
	312	}
	313
	314	err = of_property_read_u32(np, "clock-frequency", &ddata->clk_rate);
	315	if (err) {
	316	dev_err(dev, "failed to get clock frequency\n");
	317	return err;
	318	}
	319
	320	ddata->boot_base = syscon_regmap_lookup_by_phandle(np, "st,syscfg");
4b28038f	321	if (IS_ERR(ddata->boot_base)) {
63edb031	322	dev_err(dev, "Boot base not found\n");
4b28038f	323	return PTR_ERR(ddata->boot_base);
63edb031 LJ	324	}
	325
	326	err = of_property_read_u32_index(np, "st,syscfg", 1,
	327	&ddata->boot_offset);
	328	if (err) {
	329	dev_err(dev, "Boot offset not found\n");
	330	return -EINVAL;
	331	}
	332
63edb031 LJ	333	err = clk_prepare(ddata->clk);
	334	if (err)
	335	dev_err(dev, "failed to get clock\n");
	336
	337	return err;
	338	}
	339
	340	static int st_rproc_probe(struct platform_device *pdev)
	341	{
	342	struct device *dev = &pdev->dev;
63edb031 LJ	343	struct st_rproc *ddata;
	344	struct device_node *np = dev->of_node;
	345	struct rproc *rproc;
231c8dfd	346	struct mbox_chan *chan;
63edb031	347	int enabled;
231c8dfd	348	int ret, i;
63edb031	349
173d2c63	350	rproc = devm_rproc_alloc(dev, np->name, &st_rproc_ops, NULL, sizeof(*ddata));
63edb031 LJ	351	if (!rproc)
	352	return -ENOMEM;
	353
	354	rproc->has_iommu = false;
	355	ddata = rproc->priv;
5c77ebcd	356	ddata->config = (struct st_rproc_config *)device_get_match_data(dev);
173d2c63 AD	357	if (!ddata->config)
173d2c63 AD	358	return -ENODEV;
63edb031 LJ	359
	360	platform_set_drvdata(pdev, rproc);
	361
	362	ret = st_rproc_parse_dt(pdev);
	363	if (ret)
173d2c63	364	return ret;
63edb031 LJ	365
63edb031 LJ	366	enabled = st_rproc_state(pdev);
1d701d3d WY	367	if (enabled < 0) {
1d701d3d WY	368	ret = enabled;
3e49ecf6	369	goto free_clk;
1d701d3d	370	}
63edb031 LJ	371
	372	if (enabled) {
	373	atomic_inc(&rproc->power);
	374	rproc->state = RPROC_RUNNING;
	375	} else {
	376	clk_set_rate(ddata->clk, ddata->clk_rate);
	377	}
	378
1f6fa392	379	if (of_property_present(np, "mbox-names")) {
231c8dfd LP	380	ddata->mbox_client_vq0.dev = dev;
	381	ddata->mbox_client_vq0.tx_done = NULL;
	382	ddata->mbox_client_vq0.tx_block = false;
	383	ddata->mbox_client_vq0.knows_txdone = false;
	384	ddata->mbox_client_vq0.rx_callback = st_rproc_mbox_callback_vq0;
	385
	386	ddata->mbox_client_vq1.dev = dev;
	387	ddata->mbox_client_vq1.tx_done = NULL;
	388	ddata->mbox_client_vq1.tx_block = false;
	389	ddata->mbox_client_vq1.knows_txdone = false;
	390	ddata->mbox_client_vq1.rx_callback = st_rproc_mbox_callback_vq1;
	391
	392	/*
	393	* To control a co-processor without IPC mechanism.
	394	* This driver can be used without mbox and rpmsg.
	395	*/
	396	chan = mbox_request_channel_byname(&ddata->mbox_client_vq0, "vq0_rx");
	397	if (IS_ERR(chan)) {
	398	dev_err(&rproc->dev, "failed to request mbox chan 0\n");
	399	ret = PTR_ERR(chan);
	400	goto free_clk;
	401	}
	402	ddata->mbox_chan[ST_RPROC_VQ0 * MBOX_MAX + MBOX_RX] = chan;
	403
	404	chan = mbox_request_channel_byname(&ddata->mbox_client_vq0, "vq0_tx");
	405	if (IS_ERR(chan)) {
	406	dev_err(&rproc->dev, "failed to request mbox chan 0\n");
	407	ret = PTR_ERR(chan);
	408	goto free_mbox;
	409	}
	410	ddata->mbox_chan[ST_RPROC_VQ0 * MBOX_MAX + MBOX_TX] = chan;
	411
	412	chan = mbox_request_channel_byname(&ddata->mbox_client_vq1, "vq1_rx");
	413	if (IS_ERR(chan)) {
	414	dev_err(&rproc->dev, "failed to request mbox chan 1\n");
	415	ret = PTR_ERR(chan);
	416	goto free_mbox;
	417	}
	418	ddata->mbox_chan[ST_RPROC_VQ1 * MBOX_MAX + MBOX_RX] = chan;
	419
	420	chan = mbox_request_channel_byname(&ddata->mbox_client_vq1, "vq1_tx");
	421	if (IS_ERR(chan)) {
	422	dev_err(&rproc->dev, "failed to request mbox chan 1\n");
	423	ret = PTR_ERR(chan);
	424	goto free_mbox;
	425	}
	426	ddata->mbox_chan[ST_RPROC_VQ1 * MBOX_MAX + MBOX_TX] = chan;
	427	}
	428
63edb031 LJ	429	ret = rproc_add(rproc);
63edb031 LJ	430	if (ret)
231c8dfd	431	goto free_mbox;
63edb031 LJ	432
	433	return 0;
	434
231c8dfd LP	435	free_mbox:
	436	for (i = 0; i < ST_RPROC_MAX_VRING * MBOX_MAX; i++)
	437	mbox_free_channel(ddata->mbox_chan[i]);
3e49ecf6 LP	438	free_clk:
3e49ecf6 LP	439	clk_unprepare(ddata->clk);
173d2c63	440
63edb031 LJ	441	return ret;
	442	}
	443
b8b87e88	444	static void st_rproc_remove(struct platform_device *pdev)
63edb031 LJ	445	{
	446	struct rproc *rproc = platform_get_drvdata(pdev);
	447	struct st_rproc *ddata = rproc->priv;
231c8dfd	448	int i;
63edb031 LJ	449
	450	rproc_del(rproc);
	451
	452	clk_disable_unprepare(ddata->clk);
	453
231c8dfd LP	454	for (i = 0; i < ST_RPROC_MAX_VRING * MBOX_MAX; i++)
231c8dfd LP	455	mbox_free_channel(ddata->mbox_chan[i]);
63edb031 LJ	456	}
	457
	458	static struct platform_driver st_rproc_driver = {
	459	.probe = st_rproc_probe,
b8b87e88	460	.remove_new = st_rproc_remove,
63edb031 LJ	461	.driver = {
	462	.name = "st-rproc",
	463	.of_match_table = of_match_ptr(st_rproc_match),
	464	},
	465	};
	466	module_platform_driver(st_rproc_driver);
	467
	468	MODULE_DESCRIPTION("ST Remote Processor Control Driver");
	469	MODULE_AUTHOR("Ludovic Barre <[email protected]>");
	470	MODULE_LICENSE("GPL v2");