mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-12-11 13:56:30 +00:00
105 lines
2.4 KiB
C
105 lines
2.4 KiB
C
// SPDX-License-Identifier: GPL-2.0+
|
|
// (C) 2021 Pali Rohár <pali@kernel.org>
|
|
|
|
#include <common.h>
|
|
#include <dm.h>
|
|
#include <reset-uclass.h>
|
|
#include <asm/io.h>
|
|
|
|
#define MVEBU_SOC_CONTROL_1_REG 0x4
|
|
|
|
#define MVEBU_PCIE_ID 0
|
|
|
|
struct mvebu_reset_data {
|
|
void *base;
|
|
};
|
|
|
|
static int mvebu_reset_of_xlate(struct reset_ctl *rst,
|
|
struct ofnode_phandle_args *args)
|
|
{
|
|
if (args->args_count < 2)
|
|
return -EINVAL;
|
|
|
|
rst->id = args->args[0];
|
|
rst->data = args->args[1];
|
|
|
|
/* Currently only PCIe is implemented */
|
|
if (rst->id != MVEBU_PCIE_ID)
|
|
return -EINVAL;
|
|
|
|
/* Four PCIe enable bits are shared across more PCIe links */
|
|
if (!(rst->data >= 0 && rst->data <= 3))
|
|
return -EINVAL;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int mvebu_reset_request(struct reset_ctl *rst)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static int mvebu_reset_free(struct reset_ctl *rst)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static int mvebu_reset_assert(struct reset_ctl *rst)
|
|
{
|
|
struct mvebu_reset_data *data = dev_get_priv(rst->dev);
|
|
|
|
clrbits_32(data->base + MVEBU_SOC_CONTROL_1_REG, BIT(rst->data));
|
|
return 0;
|
|
}
|
|
|
|
static int mvebu_reset_deassert(struct reset_ctl *rst)
|
|
{
|
|
struct mvebu_reset_data *data = dev_get_priv(rst->dev);
|
|
|
|
setbits_32(data->base + MVEBU_SOC_CONTROL_1_REG, BIT(rst->data));
|
|
return 0;
|
|
}
|
|
|
|
static int mvebu_reset_status(struct reset_ctl *rst)
|
|
{
|
|
struct mvebu_reset_data *data = dev_get_priv(rst->dev);
|
|
|
|
return !(readl(data->base + MVEBU_SOC_CONTROL_1_REG) & BIT(rst->data));
|
|
}
|
|
|
|
static int mvebu_reset_of_to_plat(struct udevice *dev)
|
|
{
|
|
struct mvebu_reset_data *data = dev_get_priv(dev);
|
|
|
|
data->base = (void *)dev_read_addr(dev);
|
|
if ((fdt_addr_t)data->base == FDT_ADDR_T_NONE)
|
|
return -EINVAL;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct udevice_id mvebu_reset_of_match[] = {
|
|
{ .compatible = "marvell,armada-370-xp-system-controller" },
|
|
{ .compatible = "marvell,armada-375-system-controller" },
|
|
{ .compatible = "marvell,armada-380-system-controller" },
|
|
{ .compatible = "marvell,armada-390-system-controller" },
|
|
{ },
|
|
};
|
|
|
|
static const struct reset_ops mvebu_reset_ops = {
|
|
.of_xlate = mvebu_reset_of_xlate,
|
|
.request = mvebu_reset_request,
|
|
.rfree = mvebu_reset_free,
|
|
.rst_assert = mvebu_reset_assert,
|
|
.rst_deassert = mvebu_reset_deassert,
|
|
.rst_status = mvebu_reset_status,
|
|
};
|
|
|
|
U_BOOT_DRIVER(mvebu_reset) = {
|
|
.name = "mvebu-reset",
|
|
.id = UCLASS_RESET,
|
|
.of_match = mvebu_reset_of_match,
|
|
.of_to_plat = mvebu_reset_of_to_plat,
|
|
.priv_auto = sizeof(struct mvebu_reset_data),
|
|
.ops = &mvebu_reset_ops,
|
|
};
|