1 /* 2 * This program is free software; you can redistribute it and/or 3 * modify it under the terms of the GNU General Public License as 4 * published by the Free Software Foundation; either version 2 of 5 * the License, or (at your option) any later version. 6 * 7 * This program is distributed in the hope that it will be useful, 8 * but WITHOUT ANY WARRANTY; without even the implied warranty of 9 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 10 * GNU General Public License for more details. 11 * 12 * You should have received a copy of the GNU General Public License 13 * along with this program; if not, write to the Free Software 14 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, 15 * MA 02111-1307 USA 16 */ 17 18 #include <common.h> 19 #include <asm/processor.h> 20 #include <asm/io.h> 21 22 #define WDT_BASE WTCNT 23 24 #define WDT_WD (1 << 6) 25 #define WDT_RST_P (0) 26 #define WDT_RST_M (1 << 5) 27 #define WDT_ENABLE (1 << 7) 28 29 #if defined(CONFIG_WATCHDOG) 30 static unsigned char csr_read(void) 31 { 32 return inb(WDT_BASE + 0x04); 33 } 34 35 static void cnt_write(unsigned char value) 36 { 37 outl((unsigned short)value | 0x5A00, WDT_BASE + 0x00); 38 } 39 40 static void csr_write(unsigned char value) 41 { 42 outl((unsigned short)value | 0xA500, WDT_BASE + 0x04); 43 } 44 45 void watchdog_reset(void) 46 { 47 outl(0x55000000, WDT_BASE + 0x08); 48 } 49 50 int watchdog_init(void) 51 { 52 /* Set overflow time*/ 53 cnt_write(0); 54 /* Power on reset */ 55 csr_write(WDT_WD|WDT_RST_P|WDT_ENABLE); 56 57 return 0; 58 } 59 60 int watchdog_disable(void) 61 { 62 csr_write(csr_read() & ~WDT_ENABLE); 63 return 0; 64 } 65 #endif 66 67 void reset_cpu(unsigned long ignored) 68 { 69 while (1) 70 ; 71 } 72