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/*
* SPDX-License-Identifier: BSD-2-Clause
*
* Copyright (c) 2021 Samuel Holland <samuel@sholland.org>
*/
#include <libfdt.h>
#include <sbi/riscv_io.h>
#include <sbi/sbi_bitops.h>
#include <sbi/sbi_error.h>
#include <sbi/sbi_system.h>
#include <sbi_utils/fdt/fdt_helper.h>
#include <sbi_utils/reset/fdt_reset.h>
#define WDT_KEY_VAL 0x16aa0000
#define WDT_SOFT_RST_REG 0x08
#define WDT_SOFT_RST_EN BIT(0)
#define WDT_MODE_REG 0x18
static volatile void *sunxi_wdt_base;
static int sunxi_wdt_system_reset_check(u32 type, u32 reason)
{
switch (type) {
case SBI_SRST_RESET_TYPE_COLD_REBOOT:
case SBI_SRST_RESET_TYPE_WARM_REBOOT:
return 1;
}
return 0;
}
static void sunxi_wdt_system_reset(u32 type, u32 reason)
{
/* Disable the watchdog. */
writel_relaxed(WDT_KEY_VAL,
sunxi_wdt_base + WDT_MODE_REG);
/* Trigger soft reset. */
writel_relaxed(WDT_KEY_VAL | WDT_SOFT_RST_EN,
sunxi_wdt_base + WDT_SOFT_RST_REG);
}
static struct sbi_system_reset_device sunxi_wdt_reset = {
.name = "sunxi-wdt-reset",
.system_reset_check = sunxi_wdt_system_reset_check,
.system_reset = sunxi_wdt_system_reset,
};
static int sunxi_wdt_reset_init(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;
sunxi_wdt_base = (volatile void *)(unsigned long)reg_addr;
sbi_system_reset_add_device(&sunxi_wdt_reset);
return 0;
}
static const struct fdt_match sunxi_wdt_reset_match[] = {
{ .compatible = "allwinner,sun20i-d1-wdt-reset" },
{ },
};
struct fdt_reset fdt_reset_sunxi_wdt = {
.match_table = sunxi_wdt_reset_match,
.init = sunxi_wdt_reset_init,
};
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