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/*
* Copyright (C) 2016 Maxime Ripard
* Maxime Ripard <maxime.ripard@free-electrons.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*/
#include <linux/delay.h>
#include <linux/io.h>
#include <linux/reset-controller.h>
#include "ccu_reset.h"
static int ccu_reset_assert(struct reset_controller_dev *rcdev,
unsigned long id)
{
struct ccu_reset *ccu = rcdev_to_ccu_reset(rcdev);
const struct ccu_reset_map *map = &ccu->reset_map[id];
unsigned long flags;
u32 reg;
spin_lock_irqsave(ccu->lock, flags);
reg = readl(ccu->base + map->reg);
writel(reg & ~map->bit, ccu->base + map->reg);
spin_unlock_irqrestore(ccu->lock, flags);
return 0;
}
static int ccu_reset_deassert(struct reset_controller_dev *rcdev,
unsigned long id)
{
struct ccu_reset *ccu = rcdev_to_ccu_reset(rcdev);
const struct ccu_reset_map *map = &ccu->reset_map[id];
unsigned long flags;
u32 reg;
spin_lock_irqsave(ccu->lock, flags);
reg = readl(ccu->base + map->reg);
writel(reg | map->bit, ccu->base + map->reg);
spin_unlock_irqrestore(ccu->lock, flags);
return 0;
}
static int ccu_reset_reset(struct reset_controller_dev *rcdev,
unsigned long id)
{
ccu_reset_assert(rcdev, id);
udelay(10);
ccu_reset_deassert(rcdev, id);
return 0;
}
static int ccu_reset_status(struct reset_controller_dev *rcdev,
unsigned long id)
{
struct ccu_reset *ccu = rcdev_to_ccu_reset(rcdev);
const struct ccu_reset_map *map = &ccu->reset_map[id];
/*
* The reset control API expects 0 if reset is not asserted,
* which is the opposite of what our hardware uses.
*/
return !(map->bit & readl(ccu->base + map->reg));
}
const struct reset_control_ops ccu_reset_ops = {
.assert = ccu_reset_assert,
.deassert = ccu_reset_deassert,
.reset = ccu_reset_reset,
.status = ccu_reset_status,
};
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