// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (c) 2013, The Linux Foundation. All rights reserved.
 */

#include <linux/bitops.h>
#include <linux/export.h>
#include <linux/regmap.h>
#include <linux/reset-controller.h>
#include <linux/delay.h>

#include "reset.h"

static int qcom_reset(struct reset_controller_dev *rcdev, unsigned long id)
{
        struct qcom_reset_controller *rst = to_qcom_reset_controller(rcdev);

        rcdev->ops->assert(rcdev, id);
        fsleep(rst->reset_map[id].udelay ?: 1); /* use 1 us as default */

        rcdev->ops->deassert(rcdev, id);
        return 0;
}

static int qcom_reset_set_assert(struct reset_controller_dev *rcdev,
                                 unsigned long id, bool assert)
{
        struct qcom_reset_controller *rst;
        const struct qcom_reset_map *map;
        u32 mask;

        rst = to_qcom_reset_controller(rcdev);
        map = &rst->reset_map[id];
        mask = map->bitmask ? map->bitmask : BIT(map->bit);

        regmap_update_bits(rst->regmap, map->reg, mask, assert ? mask : 0);

        /* Read back the register to ensure write completion, ignore the value */
        regmap_read(rst->regmap, map->reg, &mask);

        return 0;
}

static int qcom_reset_assert(struct reset_controller_dev *rcdev, unsigned long id)
{
        return qcom_reset_set_assert(rcdev, id, true);
}

static int qcom_reset_deassert(struct reset_controller_dev *rcdev, unsigned long id)
{
        return qcom_reset_set_assert(rcdev, id, false);
}

const struct reset_control_ops qcom_reset_ops = {
        .reset = qcom_reset,
        .assert = qcom_reset_assert,
        .deassert = qcom_reset_deassert,
};
EXPORT_SYMBOL_GPL(qcom_reset_ops);