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)
csr_read(void)30 static unsigned char csr_read(void)
31 {
32 return inb(WDT_BASE + 0x04);
33 }
34
cnt_write(unsigned char value)35 static void cnt_write(unsigned char value)
36 {
37 outl((unsigned short)value | 0x5A00, WDT_BASE + 0x00);
38 }
39
csr_write(unsigned char value)40 static void csr_write(unsigned char value)
41 {
42 outl((unsigned short)value | 0xA500, WDT_BASE + 0x04);
43 }
44
watchdog_reset(void)45 void watchdog_reset(void)
46 {
47 outl(0x55000000, WDT_BASE + 0x08);
48 }
49
watchdog_init(void)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
watchdog_disable(void)60 int watchdog_disable(void)
61 {
62 csr_write(csr_read() & ~WDT_ENABLE);
63 return 0;
64 }
65 #endif
66
reset_cpu(unsigned long ignored)67 void reset_cpu(unsigned long ignored)
68 {
69 while (1)
70 ;
71 }
72