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/*
* (C) Copyright 2016 Google, Inc
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <asm/io.h>
#include <asm/arch/wdt.h>
#include <linux/err.h>
void wdt_stop(struct ast_wdt *wdt)
{
clrbits_le32(&wdt->ctrl, WDT_CTRL_EN);
}
void wdt_start(struct ast_wdt *wdt, u32 timeout)
{
writel(timeout, &wdt->counter_reload_val);
writel(WDT_COUNTER_RESTART_VAL, &wdt->counter_restart);
/*
* Setting CLK1MHZ bit is just for compatibility with ast2400 part.
* On ast2500 watchdog timer clock is fixed at 1MHz and the bit is
* read-only
*/
setbits_le32(&wdt->ctrl,
WDT_CTRL_EN | WDT_CTRL_RESET | WDT_CTRL_CLK1MHZ);
}
struct ast_wdt *ast_get_wdt(u8 wdt_number)
{
if (wdt_number > CONFIG_WDT_NUM - 1)
return ERR_PTR(-EINVAL);
return (struct ast_wdt *)(WDT_BASE +
sizeof(struct ast_wdt) * wdt_number);
}
int ast_wdt_reset_masked(struct ast_wdt *wdt, u32 mask)
{
#ifdef CONFIG_ASPEED_AST2500
if (!mask)
return -EINVAL;
writel(mask, &wdt->reset_mask);
clrbits_le32(&wdt->ctrl,
WDT_CTRL_RESET_MASK << WDT_CTRL_RESET_MODE_SHIFT);
wdt_start(wdt, 1);
/* Wait for WDT to reset */
while (readl(&wdt->ctrl) & WDT_CTRL_EN)
;
wdt_stop(wdt);
return 0;
#else
return -EINVAL;
#endif
}
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