108 lines
2.9 KiB
C
108 lines
2.9 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Toshiba Visconti ARM SoC reset controller
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*
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* Copyright (c) 2021 TOSHIBA CORPORATION
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* Copyright (c) 2021 Toshiba Electronic Devices & Storage Corporation
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*
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* Nobuhiro Iwamatsu <nobuhiro1.iwamatsu@toshiba.co.jp>
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*/
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#include <linux/delay.h>
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#include <linux/device.h>
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#include <linux/mfd/syscon.h>
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#include <linux/regmap.h>
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#include <linux/slab.h>
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#include "reset.h"
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static inline struct visconti_reset *to_visconti_reset(struct reset_controller_dev *rcdev)
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{
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return container_of(rcdev, struct visconti_reset, rcdev);
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}
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static int visconti_reset_assert(struct reset_controller_dev *rcdev, unsigned long id)
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{
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struct visconti_reset *reset = to_visconti_reset(rcdev);
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const struct visconti_reset_data *data = &reset->resets[id];
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u32 rst = BIT(data->rs_idx);
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unsigned long flags;
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int ret;
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spin_lock_irqsave(reset->lock, flags);
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ret = regmap_update_bits(reset->regmap, data->rson_offset, rst, rst);
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spin_unlock_irqrestore(reset->lock, flags);
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return ret;
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}
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static int visconti_reset_deassert(struct reset_controller_dev *rcdev, unsigned long id)
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{
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struct visconti_reset *reset = to_visconti_reset(rcdev);
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const struct visconti_reset_data *data = &reset->resets[id];
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u32 rst = BIT(data->rs_idx);
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unsigned long flags;
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int ret;
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spin_lock_irqsave(reset->lock, flags);
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ret = regmap_update_bits(reset->regmap, data->rsoff_offset, rst, rst);
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spin_unlock_irqrestore(reset->lock, flags);
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return ret;
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}
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static int visconti_reset_reset(struct reset_controller_dev *rcdev, unsigned long id)
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{
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visconti_reset_assert(rcdev, id);
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udelay(1);
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visconti_reset_deassert(rcdev, id);
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return 0;
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}
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static int visconti_reset_status(struct reset_controller_dev *rcdev, unsigned long id)
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{
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struct visconti_reset *reset = to_visconti_reset(rcdev);
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const struct visconti_reset_data *data = &reset->resets[id];
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unsigned long flags;
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u32 reg;
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int ret;
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spin_lock_irqsave(reset->lock, flags);
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ret = regmap_read(reset->regmap, data->rson_offset, ®);
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spin_unlock_irqrestore(reset->lock, flags);
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if (ret)
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return ret;
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return !(reg & data->rs_idx);
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}
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const struct reset_control_ops visconti_reset_ops = {
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.assert = visconti_reset_assert,
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.deassert = visconti_reset_deassert,
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.reset = visconti_reset_reset,
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.status = visconti_reset_status,
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};
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int visconti_register_reset_controller(struct device *dev,
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struct regmap *regmap,
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const struct visconti_reset_data *resets,
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unsigned int num_resets,
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const struct reset_control_ops *reset_ops,
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spinlock_t *lock)
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{
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struct visconti_reset *reset;
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reset = devm_kzalloc(dev, sizeof(*reset), GFP_KERNEL);
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if (!reset)
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return -ENOMEM;
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reset->regmap = regmap;
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reset->resets = resets;
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reset->rcdev.ops = reset_ops;
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reset->rcdev.nr_resets = num_resets;
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reset->rcdev.of_node = dev->of_node;
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reset->lock = lock;
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return devm_reset_controller_register(dev, &reset->rcdev);
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}
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