98 lines
2.3 KiB
C
98 lines
2.3 KiB
C
/*
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* Copyright (c) 2014 MediaTek Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/mfd/syscon.h>
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#include <linux/module.h>
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#include <linux/of.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 <linux/slab.h>
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#include "clk-mtk.h"
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struct mtk_reset {
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struct regmap *regmap;
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int regofs;
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struct reset_controller_dev rcdev;
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};
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static int mtk_reset_assert(struct reset_controller_dev *rcdev,
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unsigned long id)
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{
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struct mtk_reset *data = container_of(rcdev, struct mtk_reset, rcdev);
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return regmap_update_bits(data->regmap, data->regofs + ((id / 32) << 2),
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BIT(id % 32), ~0);
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}
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static int mtk_reset_deassert(struct reset_controller_dev *rcdev,
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unsigned long id)
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{
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struct mtk_reset *data = container_of(rcdev, struct mtk_reset, rcdev);
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return regmap_update_bits(data->regmap, data->regofs + ((id / 32) << 2),
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BIT(id % 32), 0);
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}
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static int mtk_reset(struct reset_controller_dev *rcdev,
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unsigned long id)
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{
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int ret;
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ret = mtk_reset_assert(rcdev, id);
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if (ret)
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return ret;
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return mtk_reset_deassert(rcdev, id);
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}
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static const struct reset_control_ops mtk_reset_ops = {
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.assert = mtk_reset_assert,
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.deassert = mtk_reset_deassert,
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.reset = mtk_reset,
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};
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void mtk_register_reset_controller(struct device_node *np,
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unsigned int num_regs, int regofs)
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{
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struct mtk_reset *data;
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int ret;
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struct regmap *regmap;
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regmap = syscon_node_to_regmap(np);
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if (IS_ERR(regmap)) {
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pr_err("Cannot find regmap for %pOF: %ld\n", np,
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PTR_ERR(regmap));
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return;
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}
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data = kzalloc(sizeof(*data), GFP_KERNEL);
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if (!data)
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return;
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data->regmap = regmap;
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data->regofs = regofs;
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data->rcdev.owner = THIS_MODULE;
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data->rcdev.nr_resets = num_regs * 32;
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data->rcdev.ops = &mtk_reset_ops;
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data->rcdev.of_node = np;
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ret = reset_controller_register(&data->rcdev);
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if (ret) {
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pr_err("could not register reset controller: %d\n", ret);
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kfree(data);
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return;
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}
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}
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