[linux.git] / drivers / reset / reset-oxnas.c

/*
 * drivers/reset/reset-oxnas.c
 *
 * Copyright (C) 2016 Neil Armstrong <[email protected]>
 * Copyright (C) 2014 Ma Haijun <[email protected]>
 * Copyright (C) 2009 Oxford Semiconductor Ltd
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
#include <linux/err.h>
#include <linux/init.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/reset-controller.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/types.h>
#include <linux/regmap.h>
#include <linux/mfd/syscon.h>

/* Regmap offsets */
#define RST_SET_REGOFFSET	0x34
#define RST_CLR_REGOFFSET	0x38

struct oxnas_reset {
	struct regmap *regmap;
	struct reset_controller_dev rcdev;
};

static int oxnas_reset_reset(struct reset_controller_dev *rcdev,
			      unsigned long id)
{
	struct oxnas_reset *data =
		container_of(rcdev, struct oxnas_reset, rcdev);

	regmap_write(data->regmap, RST_SET_REGOFFSET, BIT(id));
	msleep(50);
	regmap_write(data->regmap, RST_CLR_REGOFFSET, BIT(id));

	return 0;
}

static int oxnas_reset_assert(struct reset_controller_dev *rcdev,
			      unsigned long id)
{
	struct oxnas_reset *data =
		container_of(rcdev, struct oxnas_reset, rcdev);

	regmap_write(data->regmap, RST_SET_REGOFFSET, BIT(id));

	return 0;
}

static int oxnas_reset_deassert(struct reset_controller_dev *rcdev,
				unsigned long id)
{
	struct oxnas_reset *data =
		container_of(rcdev, struct oxnas_reset, rcdev);

	regmap_write(data->regmap, RST_CLR_REGOFFSET, BIT(id));

	return 0;
}

static const struct reset_control_ops oxnas_reset_ops = {
	.reset		= oxnas_reset_reset,
	.assert		= oxnas_reset_assert,
	.deassert	= oxnas_reset_deassert,
};

static const struct of_device_id oxnas_reset_dt_ids[] = {
	 { .compatible = "oxsemi,ox810se-reset", },
	 { .compatible = "oxsemi,ox820-reset", },
	 { /* sentinel */ },
};

static int oxnas_reset_probe(struct platform_device *pdev)
{
	struct oxnas_reset *data;
	struct device *parent;

	parent = pdev->dev.parent;
	if (!parent) {
		dev_err(&pdev->dev, "no parent\n");
		return -ENODEV;
	}

	data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
	if (!data)
		return -ENOMEM;

	data->regmap = syscon_node_to_regmap(parent->of_node);
	if (IS_ERR(data->regmap)) {
		dev_err(&pdev->dev, "failed to get parent regmap\n");
		return PTR_ERR(data->regmap);
	}

	platform_set_drvdata(pdev, data);

	data->rcdev.owner = THIS_MODULE;
	data->rcdev.nr_resets = 32;
	data->rcdev.ops = &oxnas_reset_ops;
	data->rcdev.of_node = pdev->dev.of_node;

	return devm_reset_controller_register(&pdev->dev, &data->rcdev);
}

static struct platform_driver oxnas_reset_driver = {
	.probe	= oxnas_reset_probe,
	.driver = {
		.name		= "oxnas-reset",
		.of_match_table	= oxnas_reset_dt_ids,
	},
};
builtin_platform_driver(oxnas_reset_driver);
Commit	Line	Data
6e667fac NA	1	/*
	2	* drivers/reset/reset-oxnas.c
	3	*
	4	* Copyright (C) 2016 Neil Armstrong <[email protected]>
	5	* Copyright (C) 2014 Ma Haijun <[email protected]>
	6	* Copyright (C) 2009 Oxford Semiconductor Ltd
	7	*
	8	* This program is free software; you can redistribute it and/or modify it
	9	* under the terms and conditions of the GNU General Public License,
	10	* version 2, as published by the Free Software Foundation.
	11	*
	12	* This program is distributed in the hope it will be useful, but WITHOUT
	13	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	14	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
	15	* more details.
	16	*
	17	* You should have received a copy of the GNU General Public License
	18	* along with this program. If not, see <http://www.gnu.org/licenses/>.
	19	*/
	20	#include <linux/err.h>
80b8b1a1	21	#include <linux/init.h>
6e667fac NA	22	#include <linux/of.h>
	23	#include <linux/platform_device.h>
	24	#include <linux/reset-controller.h>
	25	#include <linux/slab.h>
	26	#include <linux/delay.h>
	27	#include <linux/types.h>
	28	#include <linux/regmap.h>
	29	#include <linux/mfd/syscon.h>
	30
	31	/* Regmap offsets */
	32	#define RST_SET_REGOFFSET 0x34
	33	#define RST_CLR_REGOFFSET 0x38
	34
	35	struct oxnas_reset {
	36	struct regmap *regmap;
	37	struct reset_controller_dev rcdev;
	38	};
	39
	40	static int oxnas_reset_reset(struct reset_controller_dev *rcdev,
	41	unsigned long id)
	42	{
	43	struct oxnas_reset *data =
	44	container_of(rcdev, struct oxnas_reset, rcdev);
	45
	46	regmap_write(data->regmap, RST_SET_REGOFFSET, BIT(id));
	47	msleep(50);
	48	regmap_write(data->regmap, RST_CLR_REGOFFSET, BIT(id));
	49
	50	return 0;
	51	}
	52
	53	static int oxnas_reset_assert(struct reset_controller_dev *rcdev,
	54	unsigned long id)
	55	{
	56	struct oxnas_reset *data =
	57	container_of(rcdev, struct oxnas_reset, rcdev);
	58
	59	regmap_write(data->regmap, RST_SET_REGOFFSET, BIT(id));
	60
	61	return 0;
	62	}
	63
	64	static int oxnas_reset_deassert(struct reset_controller_dev *rcdev,
	65	unsigned long id)
	66	{
	67	struct oxnas_reset *data =
	68	container_of(rcdev, struct oxnas_reset, rcdev);
	69
	70	regmap_write(data->regmap, RST_CLR_REGOFFSET, BIT(id));
	71
	72	return 0;
	73	}
	74
	75	static const struct reset_control_ops oxnas_reset_ops = {
	76	.reset = oxnas_reset_reset,
	77	.assert = oxnas_reset_assert,
	78	.deassert = oxnas_reset_deassert,
	79	};
	80
	81	static const struct of_device_id oxnas_reset_dt_ids[] = {
	82	{ .compatible = "oxsemi,ox810se-reset", },
a68262bb	83	{ .compatible = "oxsemi,ox820-reset", },
6e667fac NA	84	{ /* sentinel */ },
6e667fac NA	85	};
6e667fac NA	86
	87	static int oxnas_reset_probe(struct platform_device *pdev)
	88	{
	89	struct oxnas_reset *data;
	90	struct device *parent;
	91
	92	parent = pdev->dev.parent;
	93	if (!parent) {
	94	dev_err(&pdev->dev, "no parent\n");
	95	return -ENODEV;
	96	}
	97
	98	data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
	99	if (!data)
	100	return -ENOMEM;
	101
	102	data->regmap = syscon_node_to_regmap(parent->of_node);
	103	if (IS_ERR(data->regmap)) {
	104	dev_err(&pdev->dev, "failed to get parent regmap\n");
	105	return PTR_ERR(data->regmap);
	106	}
	107
	108	platform_set_drvdata(pdev, data);
	109
	110	data->rcdev.owner = THIS_MODULE;
	111	data->rcdev.nr_resets = 32;
	112	data->rcdev.ops = &oxnas_reset_ops;
	113	data->rcdev.of_node = pdev->dev.of_node;
	114
42fa905b	115	return devm_reset_controller_register(&pdev->dev, &data->rcdev);
6e667fac NA	116	}
	117
	118	static struct platform_driver oxnas_reset_driver = {
	119	.probe = oxnas_reset_probe,
6e667fac NA	120	.driver = {
	121	.name = "oxnas-reset",
	122	.of_match_table = oxnas_reset_dt_ids,
	123	},
	124	};
80b8b1a1	125	builtin_platform_driver(oxnas_reset_driver);