9952f6918d
Based on 1 normalized pattern(s): 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 extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 228 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Steve Winslow <swinslow@gmail.com> Reviewed-by: Richard Fontana <rfontana@redhat.com> Reviewed-by: Alexios Zavras <alexios.zavras@intel.com> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190528171438.107155473@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
115 lines
2.7 KiB
C
115 lines
2.7 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* drivers/reset/reset-oxnas.c
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*
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* Copyright (C) 2016 Neil Armstrong <narmstrong@baylibre.com>
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* Copyright (C) 2014 Ma Haijun <mahaijuns@gmail.com>
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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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