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

/*
 * ST's Remote Processor Control Driver
 *
 * Copyright (C) 2015 STMicroelectronics - All Rights Reserved
 *
 * Author: Ludovic Barre <ludovic.barre@st.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#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_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_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%x\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,
};

/*
 * 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(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(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 = of_reserved_mem_device_init(dev);
	if (err) {
		dev_err(dev, "Failed to obtain shared memory\n");
		return err;
	}

	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);

	of_reserved_mem_device_release(&pdev->dev);

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