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/*
* SPDX-License-Identifier: BSD-2-Clause
*
* Copyright (c) 2026 Inochi Amaoto <[email protected]>
*/
#include <libfdt.h>
#include <sbi/riscv_io.h>
#include <sbi/sbi_error.h>
#include <sbi/sbi_system.h>
#include <sbi_utils/fdt/fdt_driver.h>
#include <sbi_utils/fdt/fdt_helper.h>
#define RESET_CTRL 0x0
static volatile u32 *litex_soc_base;
static int litex_reset_check(u32 type, u32 reason)
{
switch (type) {
case SBI_SRST_RESET_TYPE_COLD_REBOOT:
case SBI_SRST_RESET_TYPE_WARM_REBOOT:
return 255;
}
return 0;
}
static void litex_do_reset(u32 type, u32 reason)
{
writel_relaxed(0x1, litex_soc_base + RESET_CTRL);
}
static struct sbi_system_reset_device litex_reset = {
.name = "litex-reset",
.system_reset_check = litex_reset_check,
.system_reset = litex_do_reset
};
static int litex_reset_init(const void *fdt, int nodeoff,
const struct fdt_match *match)
{
uint64_t reg_addr;
int rc;
rc = fdt_get_node_addr_size(fdt, nodeoff, 0, ®_addr, NULL);
if (rc < 0 || !reg_addr)
return SBI_ENODEV;
litex_soc_base = (volatile u32 *)(unsigned long)reg_addr;
sbi_system_reset_add_device(&litex_reset);
return 0;
}
static const struct fdt_match litex_reset_match[] = {
{ .compatible = "litex,soc-controller" },
{ },
};
const struct fdt_driver fdt_reset_litex = {
.match_table = litex_reset_match,
.init = litex_reset_init,
};
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