1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * Watchdog driver for the FTWDT010 Watch Dog Driver
4 *
5 * (c) Copyright 2004 Faraday Technology Corp. (www.faraday-tech.com)
6 * Based on sa1100_wdt.c by Oleg Drokin <green@crimea.edu>
7 * Based on SoftDog driver by Alan Cox <alan@redhat.com>
8 *
9 * Copyright (C) 2011 Andes Technology Corporation
10 * Macpaul Lin, Andes Technology Corporation <macpaul@andestech.com>
11 *
12 * 27/11/2004 Initial release, Faraday.
13 * 12/01/2011 Port to u-boot, Macpaul Lin.
14 */
15
16 #include <common.h>
17 #include <log.h>
18 #include <watchdog.h>
19 #include <asm/io.h>
20 #include <faraday/ftwdt010_wdt.h>
21
22 /*
23 * Set the watchdog time interval.
24 * Counter is 32 bit.
25 */
ftwdt010_wdt_settimeout(unsigned int timeout)26 int ftwdt010_wdt_settimeout(unsigned int timeout)
27 {
28 unsigned int reg;
29
30 struct ftwdt010_wdt *wd = (struct ftwdt010_wdt *)CONFIG_FTWDT010_BASE;
31
32 debug("Activating WDT..\n");
33
34 /* Check if disabled */
35 if (readl(&wd->wdcr) & ~FTWDT010_WDCR_ENABLE) {
36 printf("sorry, watchdog is disabled\n");
37 return -1;
38 }
39
40 /*
41 * In a 66MHz system,
42 * if you set WDLOAD as 0x03EF1480 (66000000)
43 * the reset timer is 1 second.
44 */
45 reg = FTWDT010_WDLOAD(timeout * FTWDT010_TIMEOUT_FACTOR);
46
47 writel(reg, &wd->wdload);
48
49 return 0;
50 }
51
ftwdt010_wdt_reset(void)52 void ftwdt010_wdt_reset(void)
53 {
54 struct ftwdt010_wdt *wd = (struct ftwdt010_wdt *)CONFIG_FTWDT010_BASE;
55
56 /* clear control register */
57 writel(0, &wd->wdcr);
58
59 /* Write Magic number */
60 writel(FTWDT010_WDRESTART_MAGIC, &wd->wdrestart);
61
62 /* Enable WDT */
63 writel((FTWDT010_WDCR_RST | FTWDT010_WDCR_ENABLE), &wd->wdcr);
64 }
65
ftwdt010_wdt_disable(void)66 void ftwdt010_wdt_disable(void)
67 {
68 struct ftwdt010_wdt *wd = (struct ftwdt010_wdt *)CONFIG_FTWDT010_BASE;
69
70 debug("Deactivating WDT..\n");
71
72 /*
73 * It was defined with CONFIG_WATCHDOG_NOWAYOUT in Linux
74 *
75 * Shut off the timer.
76 * Lock it in if it's a module and we defined ...NOWAYOUT
77 */
78 writel(0, &wd->wdcr);
79 }
80
81 #if defined(CONFIG_HW_WATCHDOG)
hw_watchdog_reset(void)82 void hw_watchdog_reset(void)
83 {
84 ftwdt010_wdt_reset();
85 }
86
hw_watchdog_init(void)87 void hw_watchdog_init(void)
88 {
89 /* set timer in ms */
90 ftwdt010_wdt_settimeout(CONFIG_FTWDT010_HW_TIMEOUT * 1000);
91 }
92 #endif
93