67 lines
1.6 KiB
C
67 lines
1.6 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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//
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// Actions Semi Owl SoCs Reset Management Unit driver
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//
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// Copyright (c) 2018 Linaro Ltd.
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// Author: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
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#include <linux/delay.h>
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#include <linux/regmap.h>
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#include <linux/reset-controller.h>
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#include "owl-reset.h"
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static int owl_reset_assert(struct reset_controller_dev *rcdev,
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unsigned long id)
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{
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struct owl_reset *reset = to_owl_reset(rcdev);
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const struct owl_reset_map *map = &reset->reset_map[id];
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return regmap_update_bits(reset->regmap, map->reg, map->bit, 0);
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}
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static int owl_reset_deassert(struct reset_controller_dev *rcdev,
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unsigned long id)
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{
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struct owl_reset *reset = to_owl_reset(rcdev);
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const struct owl_reset_map *map = &reset->reset_map[id];
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return regmap_update_bits(reset->regmap, map->reg, map->bit, map->bit);
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}
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static int owl_reset_reset(struct reset_controller_dev *rcdev,
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unsigned long id)
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{
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owl_reset_assert(rcdev, id);
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udelay(1);
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owl_reset_deassert(rcdev, id);
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return 0;
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}
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static int owl_reset_status(struct reset_controller_dev *rcdev,
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unsigned long id)
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{
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struct owl_reset *reset = to_owl_reset(rcdev);
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const struct owl_reset_map *map = &reset->reset_map[id];
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u32 reg;
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int ret;
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ret = regmap_read(reset->regmap, map->reg, ®);
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if (ret)
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return ret;
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/*
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* The reset control API expects 0 if reset is not asserted,
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* which is the opposite of what our hardware uses.
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*/
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return !(map->bit & reg);
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}
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const struct reset_control_ops owl_reset_ops = {
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.assert = owl_reset_assert,
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.deassert = owl_reset_deassert,
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.reset = owl_reset_reset,
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.status = owl_reset_status,
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};
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