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// SPDX-License-Identifier: GPL-2.0-only
/*
* Oxford Semiconductor Reset Controller driver
*
* 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);
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