119 lines
3.1 KiB
C
119 lines
3.1 KiB
C
/*
|
|
* Copyright (c) 2014 MundoReader S.L.
|
|
* Author: Heiko Stuebner <heiko@sntech.de>
|
|
*
|
|
* 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.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*/
|
|
|
|
#include <linux/slab.h>
|
|
#include <linux/io.h>
|
|
#include <linux/reset-controller.h>
|
|
#include <linux/spinlock.h>
|
|
#include "clk.h"
|
|
|
|
struct rockchip_softrst {
|
|
struct reset_controller_dev rcdev;
|
|
void __iomem *reg_base;
|
|
int num_regs;
|
|
int num_per_reg;
|
|
u8 flags;
|
|
spinlock_t lock;
|
|
};
|
|
|
|
static int rockchip_softrst_assert(struct reset_controller_dev *rcdev,
|
|
unsigned long id)
|
|
{
|
|
struct rockchip_softrst *softrst = container_of(rcdev,
|
|
struct rockchip_softrst,
|
|
rcdev);
|
|
int bank = id / softrst->num_per_reg;
|
|
int offset = id % softrst->num_per_reg;
|
|
|
|
if (softrst->flags & ROCKCHIP_SOFTRST_HIWORD_MASK) {
|
|
writel(BIT(offset) | (BIT(offset) << 16),
|
|
softrst->reg_base + (bank * 4));
|
|
} else {
|
|
unsigned long flags;
|
|
u32 reg;
|
|
|
|
spin_lock_irqsave(&softrst->lock, flags);
|
|
|
|
reg = readl(softrst->reg_base + (bank * 4));
|
|
writel(reg | BIT(offset), softrst->reg_base + (bank * 4));
|
|
|
|
spin_unlock_irqrestore(&softrst->lock, flags);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int rockchip_softrst_deassert(struct reset_controller_dev *rcdev,
|
|
unsigned long id)
|
|
{
|
|
struct rockchip_softrst *softrst = container_of(rcdev,
|
|
struct rockchip_softrst,
|
|
rcdev);
|
|
int bank = id / softrst->num_per_reg;
|
|
int offset = id % softrst->num_per_reg;
|
|
|
|
if (softrst->flags & ROCKCHIP_SOFTRST_HIWORD_MASK) {
|
|
writel((BIT(offset) << 16), softrst->reg_base + (bank * 4));
|
|
} else {
|
|
unsigned long flags;
|
|
u32 reg;
|
|
|
|
spin_lock_irqsave(&softrst->lock, flags);
|
|
|
|
reg = readl(softrst->reg_base + (bank * 4));
|
|
writel(reg & ~BIT(offset), softrst->reg_base + (bank * 4));
|
|
|
|
spin_unlock_irqrestore(&softrst->lock, flags);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct reset_control_ops rockchip_softrst_ops = {
|
|
.assert = rockchip_softrst_assert,
|
|
.deassert = rockchip_softrst_deassert,
|
|
};
|
|
|
|
void __init rockchip_register_softrst(struct device_node *np,
|
|
unsigned int num_regs,
|
|
void __iomem *base, u8 flags)
|
|
{
|
|
struct rockchip_softrst *softrst;
|
|
int ret;
|
|
|
|
softrst = kzalloc(sizeof(*softrst), GFP_KERNEL);
|
|
if (!softrst)
|
|
return;
|
|
|
|
spin_lock_init(&softrst->lock);
|
|
|
|
softrst->reg_base = base;
|
|
softrst->flags = flags;
|
|
softrst->num_regs = num_regs;
|
|
softrst->num_per_reg = (flags & ROCKCHIP_SOFTRST_HIWORD_MASK) ? 16
|
|
: 32;
|
|
|
|
softrst->rcdev.owner = THIS_MODULE;
|
|
softrst->rcdev.nr_resets = num_regs * softrst->num_per_reg;
|
|
softrst->rcdev.ops = &rockchip_softrst_ops;
|
|
softrst->rcdev.of_node = np;
|
|
ret = reset_controller_register(&softrst->rcdev);
|
|
if (ret) {
|
|
pr_err("%s: could not register reset controller, %d\n",
|
|
__func__, ret);
|
|
kfree(softrst);
|
|
}
|
|
};
|