1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * Copyright (C) 2012 Samsung Electronics 4 * Minkyu Kang <mk7.kang@samsung.com> 5 */ 6 7 #include <common.h> 8 #include <asm/io.h> 9 #include <asm/arch/watchdog.h> 10 11 #define PRESCALER_VAL 255 12 13 void wdt_stop(void) 14 { 15 struct s5p_watchdog *wdt = 16 (struct s5p_watchdog *)samsung_get_base_watchdog(); 17 unsigned int wtcon; 18 19 wtcon = readl(&wdt->wtcon); 20 wtcon &= ~(WTCON_EN | WTCON_INT | WTCON_RESET); 21 22 writel(wtcon, &wdt->wtcon); 23 } 24 25 void wdt_start(unsigned int timeout) 26 { 27 struct s5p_watchdog *wdt = 28 (struct s5p_watchdog *)samsung_get_base_watchdog(); 29 unsigned int wtcon; 30 31 wdt_stop(); 32 33 wtcon = readl(&wdt->wtcon); 34 wtcon |= (WTCON_EN | WTCON_CLK(WTCON_CLK_128)); 35 wtcon &= ~WTCON_INT; 36 wtcon |= WTCON_RESET; 37 wtcon |= WTCON_PRESCALER(PRESCALER_VAL); 38 39 writel(timeout, &wdt->wtdat); 40 writel(timeout, &wdt->wtcnt); 41 writel(wtcon, &wdt->wtcon); 42 } 43