mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-18 02:38:56 +00:00
760188c1aa
Create driver to support the soft reset (i.e. peripheral)
of all Rockchip SoCs.
Example of usage:
i2c driver:
ret = reset_get_by_name(dev, "i2c", &reset_ctl);
if (ret) {
error("reset_get_by_name() failed: %d\n", ret);
}
reset_assert(&reset_ctl);
udelay(50);
reset_deassert(&reset_ctl);
i2c dts node:
resets = <&cru SRST_P_I2C1>, <&cru SRST_I2C1>;
reset-names = "p_i2c", "i2c";
Signed-off-by: Elaine Zhang <zhangqing@rock-chips.com>
Signed-off-by: Kever Yang <kever.yang@rock-chips.com>
Acked-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
Reviewed-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
[Fixed commit tag:]
Signed-off-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
133 lines
3.4 KiB
C
133 lines
3.4 KiB
C
/*
|
|
* (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),
|
|
};
|