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77 lines
1.8 KiB
77 lines
1.8 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* Copyright (C) 2016 Maxime Ripard |
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* Maxime Ripard <[email protected]> |
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*/ |
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#include <linux/delay.h> |
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#include <linux/io.h> |
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#include <linux/reset-controller.h> |
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#include "ccu_reset.h" |
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static int ccu_reset_assert(struct reset_controller_dev *rcdev, |
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unsigned long id) |
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{ |
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struct ccu_reset *ccu = rcdev_to_ccu_reset(rcdev); |
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const struct ccu_reset_map *map = &ccu->reset_map[id]; |
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unsigned long flags; |
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u32 reg; |
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spin_lock_irqsave(ccu->lock, flags); |
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reg = readl(ccu->base + map->reg); |
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writel(reg & ~map->bit, ccu->base + map->reg); |
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spin_unlock_irqrestore(ccu->lock, flags); |
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return 0; |
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} |
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static int ccu_reset_deassert(struct reset_controller_dev *rcdev, |
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unsigned long id) |
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{ |
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struct ccu_reset *ccu = rcdev_to_ccu_reset(rcdev); |
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const struct ccu_reset_map *map = &ccu->reset_map[id]; |
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unsigned long flags; |
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u32 reg; |
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spin_lock_irqsave(ccu->lock, flags); |
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reg = readl(ccu->base + map->reg); |
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writel(reg | map->bit, ccu->base + map->reg); |
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spin_unlock_irqrestore(ccu->lock, flags); |
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return 0; |
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} |
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static int ccu_reset_reset(struct reset_controller_dev *rcdev, |
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unsigned long id) |
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{ |
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ccu_reset_assert(rcdev, id); |
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udelay(10); |
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ccu_reset_deassert(rcdev, id); |
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return 0; |
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} |
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static int ccu_reset_status(struct reset_controller_dev *rcdev, |
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unsigned long id) |
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{ |
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struct ccu_reset *ccu = rcdev_to_ccu_reset(rcdev); |
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const struct ccu_reset_map *map = &ccu->reset_map[id]; |
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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 & readl(ccu->base + map->reg)); |
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} |
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const struct reset_control_ops ccu_reset_ops = { |
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.assert = ccu_reset_assert, |
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.deassert = ccu_reset_deassert, |
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.reset = ccu_reset_reset, |
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.status = ccu_reset_status, |
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};
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