u-boot/drivers/watchdog/s5p_wdt.c
Wolfgang Denk 1a4596601f Add GPL-2.0+ SPDX-License-Identifier to source files
Signed-off-by: Wolfgang Denk <wd@denx.de>
[trini: Fixup common/cmd_io.c]
Signed-off-by: Tom Rini <trini@ti.com>
2013-07-24 09:44:38 -04:00

43 lines
881 B
C

/*
* Copyright (C) 2012 Samsung Electronics
* Minkyu Kang <mk7.kang@samsung.com>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <asm/io.h>
#include <asm/arch/watchdog.h>
#define PRESCALER_VAL 255
void wdt_stop(void)
{
struct s5p_watchdog *wdt =
(struct s5p_watchdog *)samsung_get_base_watchdog();
unsigned int wtcon;
wtcon = readl(&wdt->wtcon);
wtcon &= ~(WTCON_EN | WTCON_INT | WTCON_RESET);
writel(wtcon, &wdt->wtcon);
}
void wdt_start(unsigned int timeout)
{
struct s5p_watchdog *wdt =
(struct s5p_watchdog *)samsung_get_base_watchdog();
unsigned int wtcon;
wdt_stop();
wtcon = readl(&wdt->wtcon);
wtcon |= (WTCON_EN | WTCON_CLK(WTCON_CLK_128));
wtcon &= ~WTCON_INT;
wtcon |= WTCON_RESET;
wtcon |= WTCON_PRESCALER(PRESCALER_VAL);
writel(timeout, &wdt->wtdat);
writel(timeout, &wdt->wtcnt);
writel(wtcon, &wdt->wtcon);
}