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/*
* (C) Copyright 2016 Google, Inc
*
* SPDX-License-Identifier: GPL-2.0
*/
#include <common.h>
#include <dm.h>
#include <errno.h>
#include <sysreset.h>
#include <asm/io.h>
#include <asm/arch/wdt.h>
#include <linux/err.h>
/* Number of Watchdog Timer ticks before reset */
#define AST_WDT_RESET_TIMEOUT 10
#define AST_WDT_FOR_RESET 0
static int ast_sysreset_request(struct udevice *dev, enum sysreset_t type)
{
struct ast_wdt *wdt = ast_get_wdt(AST_WDT_FOR_RESET);
u32 reset_mode = 0;
if (IS_ERR(wdt))
return PTR_ERR(wdt);
switch (type) {
case SYSRESET_WARM:
reset_mode = WDT_CTRL_RESET_CPU;
break;
case SYSRESET_COLD:
reset_mode = WDT_CTRL_RESET_CHIP;
break;
default:
return -EPROTONOSUPPORT;
}
/* Clear reset mode bits */
clrsetbits_le32(&wdt->ctrl,
(WDT_CTRL_RESET_MODE_MASK << WDT_CTRL_RESET_MODE_SHIFT),
(reset_mode << WDT_CTRL_RESET_MODE_SHIFT));
wdt_start(wdt, AST_WDT_RESET_TIMEOUT);
return -EINPROGRESS;
}
static struct sysreset_ops ast_sysreset = {
.request = ast_sysreset_request,
};
U_BOOT_DRIVER(sysreset_ast) = {
.name = "ast_sysreset",
.id = UCLASS_SYSRESET,
.ops = &ast_sysreset,
};