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  * SPDX-License-Identifier:	GPL-2.0+
12  *
13  * 27/11/2004 Initial release, Faraday.
14  * 12/01/2011 Port to u-boot, Macpaul Lin.
15  */
16 
17 #include <common.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  */
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 
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 
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)
82 void hw_watchdog_reset(void)
83 {
84 	ftwdt010_wdt_reset();
85 }
86 
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