[mirror_ubuntu-jammy-kernel.git] / drivers / reset / reset-oxnas.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * drivers/reset/reset-oxnas.c
 *
 * Copyright (C) 2016 Neil Armstrong <narmstrong@baylibre.com>
 * Copyright (C) 2014 Ma Haijun <mahaijuns@gmail.com>
 * Copyright (C) 2009 Oxford Semiconductor Ltd
 */
#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
9952f691	1	// SPDX-License-Identifier: GPL-2.0-only
6e667fac NA	2	/*
	3	* drivers/reset/reset-oxnas.c
	4	*
	5	* Copyright (C) 2016 Neil Armstrong <narmstrong@baylibre.com>
	6	* Copyright (C) 2014 Ma Haijun <mahaijuns@gmail.com>
	7	* Copyright (C) 2009 Oxford Semiconductor Ltd
6e667fac NA	8	*/
6e667fac NA	9	#include <linux/err.h>
80b8b1a1	10	#include <linux/init.h>
6e667fac NA	11	#include <linux/of.h>
	12	#include <linux/platform_device.h>
	13	#include <linux/reset-controller.h>
	14	#include <linux/slab.h>
	15	#include <linux/delay.h>
	16	#include <linux/types.h>
	17	#include <linux/regmap.h>
	18	#include <linux/mfd/syscon.h>
	19
	20	/* Regmap offsets */
	21	#define RST_SET_REGOFFSET 0x34
	22	#define RST_CLR_REGOFFSET 0x38
	23
	24	struct oxnas_reset {
	25	struct regmap *regmap;
	26	struct reset_controller_dev rcdev;
	27	};
	28
	29	static int oxnas_reset_reset(struct reset_controller_dev *rcdev,
	30	unsigned long id)
	31	{
	32	struct oxnas_reset *data =
	33	container_of(rcdev, struct oxnas_reset, rcdev);
	34
	35	regmap_write(data->regmap, RST_SET_REGOFFSET, BIT(id));
	36	msleep(50);
	37	regmap_write(data->regmap, RST_CLR_REGOFFSET, BIT(id));
	38
	39	return 0;
	40	}
	41
	42	static int oxnas_reset_assert(struct reset_controller_dev *rcdev,
	43	unsigned long id)
	44	{
	45	struct oxnas_reset *data =
	46	container_of(rcdev, struct oxnas_reset, rcdev);
	47
	48	regmap_write(data->regmap, RST_SET_REGOFFSET, BIT(id));
	49
	50	return 0;
	51	}
	52
	53	static int oxnas_reset_deassert(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_CLR_REGOFFSET, BIT(id));
	60
	61	return 0;
	62	}
	63
	64	static const struct reset_control_ops oxnas_reset_ops = {
	65	.reset = oxnas_reset_reset,
	66	.assert = oxnas_reset_assert,
	67	.deassert = oxnas_reset_deassert,
	68	};
	69
	70	static const struct of_device_id oxnas_reset_dt_ids[] = {
	71	{ .compatible = "oxsemi,ox810se-reset", },
a68262bb	72	{ .compatible = "oxsemi,ox820-reset", },
6e667fac NA	73	{ /* sentinel */ },
6e667fac NA	74	};
6e667fac NA	75
	76	static int oxnas_reset_probe(struct platform_device *pdev)
	77	{
	78	struct oxnas_reset *data;
	79	struct device *parent;
	80
	81	parent = pdev->dev.parent;
	82	if (!parent) {
	83	dev_err(&pdev->dev, "no parent\n");
	84	return -ENODEV;
	85	}
	86
	87	data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
	88	if (!data)
	89	return -ENOMEM;
	90
	91	data->regmap = syscon_node_to_regmap(parent->of_node);
	92	if (IS_ERR(data->regmap)) {
	93	dev_err(&pdev->dev, "failed to get parent regmap\n");
	94	return PTR_ERR(data->regmap);
	95	}
	96
	97	platform_set_drvdata(pdev, data);
	98
	99	data->rcdev.owner = THIS_MODULE;
	100	data->rcdev.nr_resets = 32;
	101	data->rcdev.ops = &oxnas_reset_ops;
	102	data->rcdev.of_node = pdev->dev.of_node;
	103
42fa905b	104	return devm_reset_controller_register(&pdev->dev, &data->rcdev);
6e667fac NA	105	}
	106
	107	static struct platform_driver oxnas_reset_driver = {
	108	.probe = oxnas_reset_probe,
6e667fac NA	109	.driver = {
	110	.name = "oxnas-reset",
	111	.of_match_table = oxnas_reset_dt_ids,
	112	},
	113	};
80b8b1a1	114	builtin_platform_driver(oxnas_reset_driver);