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reset: Add Oxford Semiconductor Reset Controller driver
Add System reset controller driver for Oxford Semiconductor OXNAS SoC Family. CC: Ma Haijun <[email protected]> Signed-off-by: Neil Armstrong <[email protected]> Signed-off-by: Philipp Zabel <[email protected]>
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/* | ||
* 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/module.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> | ||
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/* Regmap offsets */ | ||
#define RST_SET_REGOFFSET 0x34 | ||
#define RST_CLR_REGOFFSET 0x38 | ||
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struct oxnas_reset { | ||
struct regmap *regmap; | ||
struct reset_controller_dev rcdev; | ||
}; | ||
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static int oxnas_reset_reset(struct reset_controller_dev *rcdev, | ||
unsigned long id) | ||
{ | ||
struct oxnas_reset *data = | ||
container_of(rcdev, struct oxnas_reset, rcdev); | ||
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regmap_write(data->regmap, RST_SET_REGOFFSET, BIT(id)); | ||
msleep(50); | ||
regmap_write(data->regmap, RST_CLR_REGOFFSET, BIT(id)); | ||
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return 0; | ||
} | ||
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static int oxnas_reset_assert(struct reset_controller_dev *rcdev, | ||
unsigned long id) | ||
{ | ||
struct oxnas_reset *data = | ||
container_of(rcdev, struct oxnas_reset, rcdev); | ||
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regmap_write(data->regmap, RST_SET_REGOFFSET, BIT(id)); | ||
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return 0; | ||
} | ||
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static int oxnas_reset_deassert(struct reset_controller_dev *rcdev, | ||
unsigned long id) | ||
{ | ||
struct oxnas_reset *data = | ||
container_of(rcdev, struct oxnas_reset, rcdev); | ||
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regmap_write(data->regmap, RST_CLR_REGOFFSET, BIT(id)); | ||
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return 0; | ||
} | ||
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static const struct reset_control_ops oxnas_reset_ops = { | ||
.reset = oxnas_reset_reset, | ||
.assert = oxnas_reset_assert, | ||
.deassert = oxnas_reset_deassert, | ||
}; | ||
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static const struct of_device_id oxnas_reset_dt_ids[] = { | ||
{ .compatible = "oxsemi,ox810se-reset", }, | ||
{ /* sentinel */ }, | ||
}; | ||
MODULE_DEVICE_TABLE(of, oxnas_reset_dt_ids); | ||
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static int oxnas_reset_probe(struct platform_device *pdev) | ||
{ | ||
struct oxnas_reset *data; | ||
struct device *parent; | ||
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parent = pdev->dev.parent; | ||
if (!parent) { | ||
dev_err(&pdev->dev, "no parent\n"); | ||
return -ENODEV; | ||
} | ||
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data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL); | ||
if (!data) | ||
return -ENOMEM; | ||
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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); | ||
} | ||
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platform_set_drvdata(pdev, data); | ||
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data->rcdev.owner = THIS_MODULE; | ||
data->rcdev.nr_resets = 32; | ||
data->rcdev.ops = &oxnas_reset_ops; | ||
data->rcdev.of_node = pdev->dev.of_node; | ||
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return reset_controller_register(&data->rcdev); | ||
} | ||
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static int oxnas_reset_remove(struct platform_device *pdev) | ||
{ | ||
struct oxnas_reset *data = platform_get_drvdata(pdev); | ||
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reset_controller_unregister(&data->rcdev); | ||
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return 0; | ||
} | ||
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static struct platform_driver oxnas_reset_driver = { | ||
.probe = oxnas_reset_probe, | ||
.remove = oxnas_reset_remove, | ||
.driver = { | ||
.name = "oxnas-reset", | ||
.of_match_table = oxnas_reset_dt_ids, | ||
}, | ||
}; | ||
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module_platform_driver(oxnas_reset_driver); |