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66 lines
1.6 KiB
66 lines
1.6 KiB
// 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 <[email protected]> |
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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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