100 lines
2.5 KiB
C
100 lines
2.5 KiB
C
/* Copyright (c) 2016-2017, The Linux Foundation. All rights reserved.
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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 and
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* only version 2 as 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/device.h>
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#include <linux/delay.h>
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#include <linux/io.h>
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#include <linux/reset-controller.h>
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#include "reset.h"
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static int msm_reset(struct reset_controller_dev *rcdev, unsigned long id)
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{
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rcdev->ops->assert(rcdev, id);
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udelay(1);
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rcdev->ops->deassert(rcdev, id);
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return 0;
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}
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static int
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msm_reset_assert(struct reset_controller_dev *rcdev, unsigned long id)
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{
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struct msm_reset_controller *rst;
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const struct msm_reset_map *map;
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u32 regval;
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rst = to_msm_reset_controller(rcdev);
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map = &rst->reset_map[id];
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regval = readl_relaxed(rst->base + map->reg);
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regval |= BIT(map->bit);
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writel_relaxed(regval, rst->base + map->reg);
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/* Make sure the reset is asserted */
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mb();
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return 0;
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}
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static int
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msm_reset_deassert(struct reset_controller_dev *rcdev, unsigned long id)
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{
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struct msm_reset_controller *rst;
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const struct msm_reset_map *map;
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u32 regval;
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rst = to_msm_reset_controller(rcdev);
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map = &rst->reset_map[id];
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regval = readl_relaxed(rst->base + map->reg);
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regval &= ~BIT(map->bit);
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writel_relaxed(regval, rst->base + map->reg);
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/* Make sure the reset is de-asserted */
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mb();
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return 0;
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}
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struct reset_control_ops msm_reset_ops = {
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.reset = msm_reset,
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.assert = msm_reset_assert,
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.deassert = msm_reset_deassert,
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};
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EXPORT_SYMBOL(msm_reset_ops);
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int msm_reset_controller_register(struct platform_device *pdev,
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const struct msm_reset_map *map, unsigned int num_resets,
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void __iomem *virt_base)
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{
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struct msm_reset_controller *reset;
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int ret = 0;
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reset = devm_kzalloc(&pdev->dev, sizeof(*reset), GFP_KERNEL);
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if (!reset)
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return -ENOMEM;
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reset->rcdev.of_node = pdev->dev.of_node;
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reset->rcdev.ops = &msm_reset_ops;
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reset->rcdev.owner = pdev->dev.driver->owner;
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reset->rcdev.nr_resets = num_resets;
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reset->reset_map = map;
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reset->base = virt_base;
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ret = reset_controller_register(&reset->rcdev);
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if (ret)
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dev_err(&pdev->dev, "Failed to register with reset controller\n");
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return ret;
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}
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EXPORT_SYMBOL(msm_reset_controller_register);
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