60 lines
1.5 KiB
C
60 lines
1.5 KiB
C
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// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (c) 2013, The Linux Foundation. All rights reserved.
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*/
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#include <linux/bitops.h>
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#include <linux/export.h>
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#include <linux/regmap.h>
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#include <linux/reset-controller.h>
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#include <linux/delay.h>
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#include "reset.h"
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static int qcom_reset(struct reset_controller_dev *rcdev, unsigned long id)
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{
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struct qcom_reset_controller *rst = to_qcom_reset_controller(rcdev);
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rcdev->ops->assert(rcdev, id);
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fsleep(rst->reset_map[id].udelay ?: 1); /* use 1 us as default */
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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 qcom_reset_set_assert(struct reset_controller_dev *rcdev,
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unsigned long id, bool assert)
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{
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struct qcom_reset_controller *rst;
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const struct qcom_reset_map *map;
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u32 mask;
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rst = to_qcom_reset_controller(rcdev);
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map = &rst->reset_map[id];
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mask = map->bitmask ? map->bitmask : BIT(map->bit);
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regmap_update_bits(rst->regmap, map->reg, mask, assert ? mask : 0);
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/* Read back the register to ensure write completion, ignore the value */
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regmap_read(rst->regmap, map->reg, &mask);
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return 0;
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}
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static int qcom_reset_assert(struct reset_controller_dev *rcdev, unsigned long id)
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{
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return qcom_reset_set_assert(rcdev, id, true);
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}
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static int qcom_reset_deassert(struct reset_controller_dev *rcdev, unsigned long id)
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{
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return qcom_reset_set_assert(rcdev, id, false);
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}
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const struct reset_control_ops qcom_reset_ops = {
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.reset = qcom_reset,
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.assert = qcom_reset_assert,
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.deassert = qcom_reset_deassert,
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};
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EXPORT_SYMBOL_GPL(qcom_reset_ops);
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