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// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
/*
* Amlogic Meson Reset Controller driver
*
* Copyright (c) 2016-2024 BayLibre, SAS.
* Authors: Neil Armstrong <narmstrong@baylibre.com>
* Jerome Brunet <jbrunet@baylibre.com>
*/
#include <linux/err.h>
#include <linux/io.h>
#include <linux/of.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/reset-controller.h>
#include "reset-meson.h"
static const struct meson_reset_param meson8b_param = {
.reset_ops = &meson_reset_ops,
.reset_num = 256,
.reset_offset = 0x0,
.level_offset = 0x7c,
.level_low_reset = true,
};
static const struct meson_reset_param meson_a1_param = {
.reset_ops = &meson_reset_ops,
.reset_num = 96,
.reset_offset = 0x0,
.level_offset = 0x40,
.level_low_reset = true,
};
static const struct meson_reset_param meson_s4_param = {
.reset_ops = &meson_reset_ops,
.reset_num = 192,
.reset_offset = 0x0,
.level_offset = 0x40,
.level_low_reset = true,
};
static const struct meson_reset_param t7_param = {
.reset_num = 224,
.reset_offset = 0x0,
.level_offset = 0x40,
.level_low_reset = true,
};
static const struct of_device_id meson_reset_dt_ids[] = {
{ .compatible = "amlogic,meson8b-reset", .data = &meson8b_param},
{ .compatible = "amlogic,meson-gxbb-reset", .data = &meson8b_param},
{ .compatible = "amlogic,meson-axg-reset", .data = &meson8b_param},
{ .compatible = "amlogic,meson-a1-reset", .data = &meson_a1_param},
{ .compatible = "amlogic,meson-s4-reset", .data = &meson_s4_param},
{ .compatible = "amlogic,c3-reset", .data = &meson_s4_param},
{ .compatible = "amlogic,t7-reset", .data = &t7_param},
{ /* sentinel */ },
};
MODULE_DEVICE_TABLE(of, meson_reset_dt_ids);
static const struct regmap_config regmap_config = {
.reg_bits = 32,
.val_bits = 32,
.reg_stride = 4,
};
static int meson_reset_probe(struct platform_device *pdev)
{
const struct meson_reset_param *param;
struct device *dev = &pdev->dev;
struct regmap *map;
void __iomem *base;
base = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(base))
return PTR_ERR(base);
param = device_get_match_data(dev);
if (!param)
return -ENODEV;
map = devm_regmap_init_mmio(dev, base, ®map_config);
if (IS_ERR(map))
return dev_err_probe(dev, PTR_ERR(map),
"can't init regmap mmio region\n");
return meson_reset_controller_register(dev, map, param);
}
static struct platform_driver meson_reset_driver = {
.probe = meson_reset_probe,
.driver = {
.name = "meson_reset",
.of_match_table = meson_reset_dt_ids,
},
};
module_platform_driver(meson_reset_driver);
MODULE_DESCRIPTION("Amlogic Meson Reset Controller driver");
MODULE_AUTHOR("Neil Armstrong <narmstrong@baylibre.com>");
MODULE_AUTHOR("Jerome Brunet <jbrunet@baylibre.com>");
MODULE_LICENSE("Dual BSD/GPL");
MODULE_IMPORT_NS("MESON_RESET");
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