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// 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,
};
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