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lib: utils/reset: Add a sunxi watchdog reset driver

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One of the watchdogs in the D1 SoC provides a "soft reset" function,
which allows software to immediately reset the entire SoC. Add a driver
so it can implement the SBI system reset function.

Signed-off-by: Samuel Holland <samuel@sholland.org>
Reviewed-by: Anup Patel <anup.patel@wdc.com>
This commit is contained in:
Samuel Holland
2021-09-08 21:10:09 -05:00
committed by Anup Patel
parent 0274a96004
commit 395ff7eede
3 changed files with 80 additions and 0 deletions
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2
lib/utils/reset/fdt_reset.c
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@@ -16,6 +16,7 @@ extern struct fdt_reset fdt_poweroff_gpio;
extern struct fdt_reset fdt_reset_gpio;
extern struct fdt_reset fdt_reset_htif;
extern struct fdt_reset fdt_reset_sifive_test;
extern struct fdt_reset fdt_reset_sunxi_wdt;
extern struct fdt_reset fdt_reset_thead;
static struct fdt_reset *reset_drivers[] = {
@@ -23,6 +24,7 @@ static struct fdt_reset *reset_drivers[] = {
&fdt_reset_gpio,
&fdt_reset_htif,
&fdt_reset_sifive_test,
&fdt_reset_sunxi_wdt,
&fdt_reset_thead,
};

77
lib/utils/reset/fdt_reset_sunxi_wdt.c Normal file
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@@ -0,0 +1,77 @@
/*
* 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, &reg_addr, NULL);
if (rc < 0 || !reg_addr)
return SBI_ENODEV;
sunxi_wdt_base = (volatile void *)(unsigned long)reg_addr;
sbi_system_reset_set_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,
};

1
lib/utils/reset/objects.mk
View File

@@ -11,5 +11,6 @@ libsbiutils-objs-y += reset/fdt_reset.o
libsbiutils-objs-y += reset/fdt_reset_gpio.o
libsbiutils-objs-y += reset/fdt_reset_htif.o
libsbiutils-objs-y += reset/fdt_reset_sifive_test.o
libsbiutils-objs-y += reset/fdt_reset_sunxi_wdt.o
libsbiutils-objs-y += reset/fdt_reset_thead.o
libsbiutils-objs-y += reset/fdt_reset_thead_asm.o