1 /*
2  * Watchdog driver for the FTWDT010 Watch Dog Driver
3  *
4  * (c) Copyright 2004 Faraday Technology Corp. (www.faraday-tech.com)
5  * Based on sa1100_wdt.c by Oleg Drokin <green@crimea.edu>
6  * Based on SoftDog driver by Alan Cox <alan@redhat.com>
7  *
8  * Copyright (C) 2011 Andes Technology Corporation
9  * Macpaul Lin, Andes Technology Corporation <macpaul@andestech.com>
10  *
11  * This program is free software; you can redistribute it and/or modify
12  * it under the terms of the GNU General Public License as published by
13  * the Free Software Foundation; either version 2 of the License, or
14  * (at your option) any later version.
15  *
16  * This program is distributed in the hope that it will be useful,
17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
19  * GNU General Public License for more details.
20  *
21  * You should have received a copy of the GNU General Public License
22  * along with this program; if not, write to the Free Software
23  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
24  *
25  * 27/11/2004 Initial release, Faraday.
26  * 12/01/2011 Port to u-boot, Macpaul Lin.
27  */
28 
29 #include <common.h>
30 #include <watchdog.h>
31 #include <asm/io.h>
32 #include <faraday/ftwdt010_wdt.h>
33 
34 /*
35  * Set the watchdog time interval.
36  * Counter is 32 bit.
37  */
38 int ftwdt010_wdt_settimeout(unsigned int timeout)
39 {
40 	unsigned int reg;
41 
42 	struct ftwdt010_wdt *wd = (struct ftwdt010_wdt *)CONFIG_FTWDT010_BASE;
43 
44 	debug("Activating WDT..\n");
45 
46 	/* Check if disabled */
47 	if (readl(&wd->wdcr) & ~FTWDT010_WDCR_ENABLE) {
48 		printf("sorry, watchdog is disabled\n");
49 		return -1;
50 	}
51 
52 	/*
53 	 * In a 66MHz system,
54 	 * if you set WDLOAD as 0x03EF1480 (66000000)
55 	 * the reset timer is 1 second.
56 	 */
57 	reg = FTWDT010_WDLOAD(timeout * FTWDT010_TIMEOUT_FACTOR);
58 
59 	writel(reg, &wd->wdload);
60 
61 	return 0;
62 }
63 
64 void ftwdt010_wdt_reset(void)
65 {
66 	struct ftwdt010_wdt *wd = (struct ftwdt010_wdt *)CONFIG_FTWDT010_BASE;
67 
68 	/* clear control register */
69 	writel(0, &wd->wdcr);
70 
71 	/* Write Magic number */
72 	writel(FTWDT010_WDRESTART_MAGIC, &wd->wdrestart);
73 
74 	/* Enable WDT */
75 	writel((FTWDT010_WDCR_RST | FTWDT010_WDCR_ENABLE), &wd->wdcr);
76 }
77 
78 void ftwdt010_wdt_disable(void)
79 {
80 	struct ftwdt010_wdt *wd = (struct ftwdt010_wdt *)CONFIG_FTWDT010_BASE;
81 
82 	debug("Deactivating WDT..\n");
83 
84 	/*
85 	 * It was defined with CONFIG_WATCHDOG_NOWAYOUT in Linux
86 	 *
87 	 * Shut off the timer.
88 	 * Lock it in if it's a module and we defined ...NOWAYOUT
89 	 */
90 	writel(0, &wd->wdcr);
91 }
92 
93 #if defined(CONFIG_HW_WATCHDOG)
94 void hw_watchdog_reset(void)
95 {
96 	ftwdt010_wdt_reset();
97 }
98 
99 void hw_watchdog_init(void)
100 {
101 	/* set timer in ms */
102 	ftwdt010_wdt_settimeout(CONFIG_FTWDT010_HW_TIMEOUT * 1000);
103 }
104 #endif
105