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