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/system.h> 21 #include <asm/io.h> 22 23 #define WDT_BASE WTCNT 24 25 #define WDT_WD (1 << 6) 26 #define WDT_RST_P (0) 27 #define WDT_RST_M (1 << 5) 28 #define WDT_ENABLE (1 << 7) 29 30 #if defined(CONFIG_WATCHDOG) 31 static unsigned char csr_read(void) 32 { 33 return inb(WDT_BASE + 0x04); 34 } 35 36 static void cnt_write(unsigned char value) 37 { 38 outl((unsigned short)value | 0x5A00, WDT_BASE + 0x00); 39 } 40 41 static void csr_write(unsigned char value) 42 { 43 outl((unsigned short)value | 0xA500, WDT_BASE + 0x04); 44 } 45 46 void watchdog_reset(void) 47 { 48 outl(0x55000000, WDT_BASE + 0x08); 49 } 50 51 int watchdog_init(void) 52 { 53 /* Set overflow time*/ 54 cnt_write(0); 55 /* Power on reset */ 56 csr_write(WDT_WD|WDT_RST_P|WDT_ENABLE); 57 58 return 0; 59 } 60 61 int watchdog_disable(void) 62 { 63 csr_write(csr_read() & ~WDT_ENABLE); 64 return 0; 65 } 66 #endif 67 68 void reset_cpu(unsigned long ignored) 69 { 70 /* Address error with SR.BL=1 first. */ 71 trigger_address_error(); 72 73 while (1) 74 ; 75 } 76