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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * Copyright (c) 2013, The Linux Foundation. All rights reserved.4 */5 6#include <linux/bitops.h>7#include <linux/export.h>8#include <linux/regmap.h>9#include <linux/reset-controller.h>10#include <linux/delay.h>11 12#include "reset.h"13 14static int qcom_reset(struct reset_controller_dev *rcdev, unsigned long id)15{16 struct qcom_reset_controller *rst = to_qcom_reset_controller(rcdev);17 18 rcdev->ops->assert(rcdev, id);19 fsleep(rst->reset_map[id].udelay ?: 1); /* use 1 us as default */20 21 rcdev->ops->deassert(rcdev, id);22 return 0;23}24 25static int qcom_reset_set_assert(struct reset_controller_dev *rcdev,26 unsigned long id, bool assert)27{28 struct qcom_reset_controller *rst;29 const struct qcom_reset_map *map;30 u32 mask;31 32 rst = to_qcom_reset_controller(rcdev);33 map = &rst->reset_map[id];34 mask = map->bitmask ? map->bitmask : BIT(map->bit);35 36 regmap_update_bits(rst->regmap, map->reg, mask, assert ? mask : 0);37 38 /* Read back the register to ensure write completion, ignore the value */39 regmap_read(rst->regmap, map->reg, &mask);40 41 return 0;42}43 44static int qcom_reset_assert(struct reset_controller_dev *rcdev, unsigned long id)45{46 return qcom_reset_set_assert(rcdev, id, true);47}48 49static int qcom_reset_deassert(struct reset_controller_dev *rcdev, unsigned long id)50{51 return qcom_reset_set_assert(rcdev, id, false);52}53 54const struct reset_control_ops qcom_reset_ops = {55 .reset = qcom_reset,56 .assert = qcom_reset_assert,57 .deassert = qcom_reset_deassert,58};59EXPORT_SYMBOL_GPL(qcom_reset_ops);60