reset-rockchip.c
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/*
* (C) Copyright 2017 Rockchip Electronics Co., Ltd
*
* SPDX-License-Identifier: GPL-2.0
*/
#include <common.h>
#include <dm.h>
#include <reset-uclass.h>
#include <linux/io.h>
#include <asm/arch/hardware.h>
#include <dm/lists.h>
/*
* Each reg has 16 bits reset signal for devices
* Note: Not including rk2818 and older SoCs
*/
#define ROCKCHIP_RESET_NUM_IN_REG 16
struct rockchip_reset_priv {
void __iomem *base;
/* Rockchip reset reg locate at cru controller */
u32 reset_reg_offset;
/* Rockchip reset reg number */
u32 reset_reg_num;
};
static int rockchip_reset_request(struct reset_ctl *reset_ctl)
{
struct rockchip_reset_priv *priv = dev_get_priv(reset_ctl->dev);
debug("%s(reset_ctl=%p) (dev=%p, id=%lu) (reg_num=%d)\n", __func__,
reset_ctl, reset_ctl->dev, reset_ctl->id, priv->reset_reg_num);
if (reset_ctl->id / ROCKCHIP_RESET_NUM_IN_REG >= priv->reset_reg_num)
return -EINVAL;
return 0;
}
static int rockchip_reset_free(struct reset_ctl *reset_ctl)
{
debug("%s(reset_ctl=%p) (dev=%p, id=%lu)\n", __func__, reset_ctl,
reset_ctl->dev, reset_ctl->id);
return 0;
}
static int rockchip_reset_assert(struct reset_ctl *reset_ctl)
{
struct rockchip_reset_priv *priv = dev_get_priv(reset_ctl->dev);
int bank = reset_ctl->id / ROCKCHIP_RESET_NUM_IN_REG;
int offset = reset_ctl->id % ROCKCHIP_RESET_NUM_IN_REG;
debug("%s(reset_ctl=%p) (dev=%p, id=%lu) (reg_addr=%p)\n", __func__,
reset_ctl, reset_ctl->dev, reset_ctl->id,
priv->base + (bank * 4));
rk_setreg(priv->base + (bank * 4), BIT(offset));
return 0;
}
static int rockchip_reset_deassert(struct reset_ctl *reset_ctl)
{
struct rockchip_reset_priv *priv = dev_get_priv(reset_ctl->dev);
int bank = reset_ctl->id / ROCKCHIP_RESET_NUM_IN_REG;
int offset = reset_ctl->id % ROCKCHIP_RESET_NUM_IN_REG;
debug("%s(reset_ctl=%p) (dev=%p, id=%lu) (reg_addr=%p)\n", __func__,
reset_ctl, reset_ctl->dev, reset_ctl->id,
priv->base + (bank * 4));
rk_clrreg(priv->base + (bank * 4), BIT(offset));
return 0;
}
struct reset_ops rockchip_reset_ops = {
.request = rockchip_reset_request,
.free = rockchip_reset_free,
.rst_assert = rockchip_reset_assert,
.rst_deassert = rockchip_reset_deassert,
};
static int rockchip_reset_probe(struct udevice *dev)
{
struct rockchip_reset_priv *priv = dev_get_priv(dev);
fdt_addr_t addr;
fdt_size_t size;
addr = dev_read_addr_size(dev, "reg", &size);
if (addr == FDT_ADDR_T_NONE)
return -EINVAL;
if ((priv->reset_reg_offset == 0) && (priv->reset_reg_num == 0))
return -EINVAL;
addr += priv->reset_reg_offset;
priv->base = ioremap(addr, size);
debug("%s(base=%p) (reg_offset=%x, reg_num=%d)\n", __func__,
priv->base, priv->reset_reg_offset, priv->reset_reg_num);
return 0;
}
int rockchip_reset_bind(struct udevice *pdev, u32 reg_offset, u32 reg_number)
{
struct udevice *rst_dev;
struct rockchip_reset_priv *priv;
int ret;
ret = device_bind_driver_to_node(pdev, "rockchip_reset", "reset",
dev_ofnode(pdev), &rst_dev);
if (ret) {
debug("Warning: No rockchip reset driver: ret=%d\n", ret);
return ret;
}
priv = malloc(sizeof(struct rockchip_reset_priv));
priv->reset_reg_offset = reg_offset;
priv->reset_reg_num = reg_number;
rst_dev->priv = priv;
return 0;
}
U_BOOT_DRIVER(rockchip_reset) = {
.name = "rockchip_reset",
.id = UCLASS_RESET,
.probe = rockchip_reset_probe,
.ops = &rockchip_reset_ops,
.priv_auto_alloc_size = sizeof(struct rockchip_reset_priv),
};