/*
|
* 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
|
*
|
* 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);
|
