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114 lines
2.7 KiB
114 lines
2.7 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Oxford Semiconductor Reset Controller driver |
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* |
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* Copyright (C) 2016 Neil Armstrong <[email protected]> |
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* Copyright (C) 2014 Ma Haijun <[email protected]> |
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* Copyright (C) 2009 Oxford Semiconductor Ltd |
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*/ |
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#include <linux/err.h> |
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#include <linux/init.h> |
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#include <linux/of.h> |
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#include <linux/platform_device.h> |
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#include <linux/reset-controller.h> |
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#include <linux/slab.h> |
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#include <linux/delay.h> |
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#include <linux/types.h> |
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#include <linux/regmap.h> |
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#include <linux/mfd/syscon.h> |
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/* Regmap offsets */ |
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#define RST_SET_REGOFFSET 0x34 |
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#define RST_CLR_REGOFFSET 0x38 |
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struct oxnas_reset { |
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struct regmap *regmap; |
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struct reset_controller_dev rcdev; |
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}; |
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static int oxnas_reset_reset(struct reset_controller_dev *rcdev, |
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unsigned long id) |
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{ |
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struct oxnas_reset *data = |
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container_of(rcdev, struct oxnas_reset, rcdev); |
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regmap_write(data->regmap, RST_SET_REGOFFSET, BIT(id)); |
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msleep(50); |
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regmap_write(data->regmap, RST_CLR_REGOFFSET, BIT(id)); |
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return 0; |
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} |
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static int oxnas_reset_assert(struct reset_controller_dev *rcdev, |
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unsigned long id) |
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{ |
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struct oxnas_reset *data = |
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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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} |
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static int oxnas_reset_deassert(struct reset_controller_dev *rcdev, |
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unsigned long id) |
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{ |
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struct oxnas_reset *data = |
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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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} |
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static const struct reset_control_ops oxnas_reset_ops = { |
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.reset = oxnas_reset_reset, |
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.assert = oxnas_reset_assert, |
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.deassert = oxnas_reset_deassert, |
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}; |
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static const struct of_device_id oxnas_reset_dt_ids[] = { |
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{ .compatible = "oxsemi,ox810se-reset", }, |
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{ .compatible = "oxsemi,ox820-reset", }, |
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{ /* sentinel */ }, |
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}; |
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static int oxnas_reset_probe(struct platform_device *pdev) |
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{ |
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struct oxnas_reset *data; |
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struct device *parent; |
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parent = pdev->dev.parent; |
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if (!parent) { |
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dev_err(&pdev->dev, "no parent\n"); |
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return -ENODEV; |
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} |
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data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL); |
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if (!data) |
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return -ENOMEM; |
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data->regmap = syscon_node_to_regmap(parent->of_node); |
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if (IS_ERR(data->regmap)) { |
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dev_err(&pdev->dev, "failed to get parent regmap\n"); |
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return PTR_ERR(data->regmap); |
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} |
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platform_set_drvdata(pdev, data); |
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data->rcdev.owner = THIS_MODULE; |
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data->rcdev.nr_resets = 32; |
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data->rcdev.ops = &oxnas_reset_ops; |
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data->rcdev.of_node = pdev->dev.of_node; |
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return devm_reset_controller_register(&pdev->dev, &data->rcdev); |
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} |
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static struct platform_driver oxnas_reset_driver = { |
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.probe = oxnas_reset_probe, |
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.driver = { |
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.name = "oxnas-reset", |
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.of_match_table = oxnas_reset_dt_ids, |
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}, |
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}; |
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builtin_platform_driver(oxnas_reset_driver);
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