1 /* 2 * Copyright (C) 2012 Samsung Electronics 3 * Minkyu Kang <mk7.kang@samsung.com> 4 * 5 * See file CREDITS for list of people who contributed to this 6 * project. 7 * 8 * This program is free software; you can redistribute it and/or 9 * modify it under the terms of the GNU General Public License as 10 * published by the Free Software Foundation; either version 2 of 11 * the License, or (at your option) any later version. 12 * 13 * This program is distributed in the hope that it will be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 * GNU General Public License for more details. 17 * 18 * You should have received a copy of the GNU General Public License 19 * along with this program; if not, write to the Free Software 20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, 21 * MA 02111-1307 USA 22 */ 23 24 #include <common.h> 25 #include <asm/io.h> 26 #include <asm/arch/watchdog.h> 27 28 #define PRESCALER_VAL 255 29 30 void wdt_stop(void) 31 { 32 struct s5p_watchdog *wdt = 33 (struct s5p_watchdog *)samsung_get_base_watchdog(); 34 unsigned int wtcon; 35 36 wtcon = readl(&wdt->wtcon); 37 wtcon &= ~(WTCON_EN | WTCON_INT | WTCON_RESET); 38 39 writel(wtcon, &wdt->wtcon); 40 } 41 42 void wdt_start(unsigned int timeout) 43 { 44 struct s5p_watchdog *wdt = 45 (struct s5p_watchdog *)samsung_get_base_watchdog(); 46 unsigned int wtcon; 47 48 wdt_stop(); 49 50 wtcon = readl(&wdt->wtcon); 51 wtcon |= (WTCON_EN | WTCON_CLK(WTCON_CLK_128)); 52 wtcon &= ~WTCON_INT; 53 wtcon |= WTCON_RESET; 54 wtcon |= WTCON_PRESCALER(PRESCALER_VAL); 55 56 writel(timeout, &wdt->wtdat); 57 writel(timeout, &wdt->wtcnt); 58 writel(wtcon, &wdt->wtcon); 59 } 60