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 <watchdog.h>
18 #include <asm/io.h>
19 #include <faraday/ftwdt010_wdt.h>
20
21 /*
22 * Set the watchdog time interval.
23 * Counter is 32 bit.
24 */
ftwdt010_wdt_settimeout(unsigned int timeout)25 int ftwdt010_wdt_settimeout(unsigned int timeout)
26 {
27 unsigned int reg;
28
29 struct ftwdt010_wdt *wd = (struct ftwdt010_wdt *)CONFIG_FTWDT010_BASE;
30
31 debug("Activating WDT..\n");
32
33 /* Check if disabled */
34 if (readl(&wd->wdcr) & ~FTWDT010_WDCR_ENABLE) {
35 printf("sorry, watchdog is disabled\n");
36 return -1;
37 }
38
39 /*
40 * In a 66MHz system,
41 * if you set WDLOAD as 0x03EF1480 (66000000)
42 * the reset timer is 1 second.
43 */
44 reg = FTWDT010_WDLOAD(timeout * FTWDT010_TIMEOUT_FACTOR);
45
46 writel(reg, &wd->wdload);
47
48 return 0;
49 }
50
ftwdt010_wdt_reset(void)51 void ftwdt010_wdt_reset(void)
52 {
53 struct ftwdt010_wdt *wd = (struct ftwdt010_wdt *)CONFIG_FTWDT010_BASE;
54
55 /* clear control register */
56 writel(0, &wd->wdcr);
57
58 /* Write Magic number */
59 writel(FTWDT010_WDRESTART_MAGIC, &wd->wdrestart);
60
61 /* Enable WDT */
62 writel((FTWDT010_WDCR_RST | FTWDT010_WDCR_ENABLE), &wd->wdcr);
63 }
64
ftwdt010_wdt_disable(void)65 void ftwdt010_wdt_disable(void)
66 {
67 struct ftwdt010_wdt *wd = (struct ftwdt010_wdt *)CONFIG_FTWDT010_BASE;
68
69 debug("Deactivating WDT..\n");
70
71 /*
72 * It was defined with CONFIG_WATCHDOG_NOWAYOUT in Linux
73 *
74 * Shut off the timer.
75 * Lock it in if it's a module and we defined ...NOWAYOUT
76 */
77 writel(0, &wd->wdcr);
78 }
79
80 #if defined(CONFIG_HW_WATCHDOG)
hw_watchdog_reset(void)81 void hw_watchdog_reset(void)
82 {
83 ftwdt010_wdt_reset();
84 }
85
hw_watchdog_init(void)86 void hw_watchdog_init(void)
87 {
88 /* set timer in ms */
89 ftwdt010_wdt_settimeout(CONFIG_FTWDT010_HW_TIMEOUT * 1000);
90 }
91 #endif
92