1*4882a593Smuzhiyun /*
2*4882a593Smuzhiyun * Watchdog driver for the FTWDT010 Watch Dog Driver
3*4882a593Smuzhiyun *
4*4882a593Smuzhiyun * (c) Copyright 2004 Faraday Technology Corp. (www.faraday-tech.com)
5*4882a593Smuzhiyun * Based on sa1100_wdt.c by Oleg Drokin <green@crimea.edu>
6*4882a593Smuzhiyun * Based on SoftDog driver by Alan Cox <alan@redhat.com>
7*4882a593Smuzhiyun *
8*4882a593Smuzhiyun * Copyright (C) 2011 Andes Technology Corporation
9*4882a593Smuzhiyun * Macpaul Lin, Andes Technology Corporation <macpaul@andestech.com>
10*4882a593Smuzhiyun *
11*4882a593Smuzhiyun * SPDX-License-Identifier: GPL-2.0+
12*4882a593Smuzhiyun *
13*4882a593Smuzhiyun * 27/11/2004 Initial release, Faraday.
14*4882a593Smuzhiyun * 12/01/2011 Port to u-boot, Macpaul Lin.
15*4882a593Smuzhiyun */
16*4882a593Smuzhiyun
17*4882a593Smuzhiyun #include <common.h>
18*4882a593Smuzhiyun #include <watchdog.h>
19*4882a593Smuzhiyun #include <asm/io.h>
20*4882a593Smuzhiyun #include <faraday/ftwdt010_wdt.h>
21*4882a593Smuzhiyun
22*4882a593Smuzhiyun /*
23*4882a593Smuzhiyun * Set the watchdog time interval.
24*4882a593Smuzhiyun * Counter is 32 bit.
25*4882a593Smuzhiyun */
ftwdt010_wdt_settimeout(unsigned int timeout)26*4882a593Smuzhiyun int ftwdt010_wdt_settimeout(unsigned int timeout)
27*4882a593Smuzhiyun {
28*4882a593Smuzhiyun unsigned int reg;
29*4882a593Smuzhiyun
30*4882a593Smuzhiyun struct ftwdt010_wdt *wd = (struct ftwdt010_wdt *)CONFIG_FTWDT010_BASE;
31*4882a593Smuzhiyun
32*4882a593Smuzhiyun debug("Activating WDT..\n");
33*4882a593Smuzhiyun
34*4882a593Smuzhiyun /* Check if disabled */
35*4882a593Smuzhiyun if (readl(&wd->wdcr) & ~FTWDT010_WDCR_ENABLE) {
36*4882a593Smuzhiyun printf("sorry, watchdog is disabled\n");
37*4882a593Smuzhiyun return -1;
38*4882a593Smuzhiyun }
39*4882a593Smuzhiyun
40*4882a593Smuzhiyun /*
41*4882a593Smuzhiyun * In a 66MHz system,
42*4882a593Smuzhiyun * if you set WDLOAD as 0x03EF1480 (66000000)
43*4882a593Smuzhiyun * the reset timer is 1 second.
44*4882a593Smuzhiyun */
45*4882a593Smuzhiyun reg = FTWDT010_WDLOAD(timeout * FTWDT010_TIMEOUT_FACTOR);
46*4882a593Smuzhiyun
47*4882a593Smuzhiyun writel(reg, &wd->wdload);
48*4882a593Smuzhiyun
49*4882a593Smuzhiyun return 0;
50*4882a593Smuzhiyun }
51*4882a593Smuzhiyun
ftwdt010_wdt_reset(void)52*4882a593Smuzhiyun void ftwdt010_wdt_reset(void)
53*4882a593Smuzhiyun {
54*4882a593Smuzhiyun struct ftwdt010_wdt *wd = (struct ftwdt010_wdt *)CONFIG_FTWDT010_BASE;
55*4882a593Smuzhiyun
56*4882a593Smuzhiyun /* clear control register */
57*4882a593Smuzhiyun writel(0, &wd->wdcr);
58*4882a593Smuzhiyun
59*4882a593Smuzhiyun /* Write Magic number */
60*4882a593Smuzhiyun writel(FTWDT010_WDRESTART_MAGIC, &wd->wdrestart);
61*4882a593Smuzhiyun
62*4882a593Smuzhiyun /* Enable WDT */
63*4882a593Smuzhiyun writel((FTWDT010_WDCR_RST | FTWDT010_WDCR_ENABLE), &wd->wdcr);
64*4882a593Smuzhiyun }
65*4882a593Smuzhiyun
ftwdt010_wdt_disable(void)66*4882a593Smuzhiyun void ftwdt010_wdt_disable(void)
67*4882a593Smuzhiyun {
68*4882a593Smuzhiyun struct ftwdt010_wdt *wd = (struct ftwdt010_wdt *)CONFIG_FTWDT010_BASE;
69*4882a593Smuzhiyun
70*4882a593Smuzhiyun debug("Deactivating WDT..\n");
71*4882a593Smuzhiyun
72*4882a593Smuzhiyun /*
73*4882a593Smuzhiyun * It was defined with CONFIG_WATCHDOG_NOWAYOUT in Linux
74*4882a593Smuzhiyun *
75*4882a593Smuzhiyun * Shut off the timer.
76*4882a593Smuzhiyun * Lock it in if it's a module and we defined ...NOWAYOUT
77*4882a593Smuzhiyun */
78*4882a593Smuzhiyun writel(0, &wd->wdcr);
79*4882a593Smuzhiyun }
80*4882a593Smuzhiyun
81*4882a593Smuzhiyun #if defined(CONFIG_HW_WATCHDOG)
hw_watchdog_reset(void)82*4882a593Smuzhiyun void hw_watchdog_reset(void)
83*4882a593Smuzhiyun {
84*4882a593Smuzhiyun ftwdt010_wdt_reset();
85*4882a593Smuzhiyun }
86*4882a593Smuzhiyun
hw_watchdog_init(void)87*4882a593Smuzhiyun void hw_watchdog_init(void)
88*4882a593Smuzhiyun {
89*4882a593Smuzhiyun /* set timer in ms */
90*4882a593Smuzhiyun ftwdt010_wdt_settimeout(CONFIG_FTWDT010_HW_TIMEOUT * 1000);
91*4882a593Smuzhiyun }
92*4882a593Smuzhiyun #endif
93