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107 lines
2.9 KiB
107 lines
2.9 KiB
// 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 <[email protected]> |
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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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