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gerrit.devboardsforandroid.linaro.org / platform / external / u-boot / c9fc7044882333439ea611ed1f960fb295b12287 / . / drivers / watchdog / ftwdt010_wdt.c
blob: a6b33b17209d0c0c7d20dd653c8a5a5f3c30f426 [file] [log] [blame]
Sergei Antonov6e44bb02023-04-12 14:01:58 +0300[diff] [blame]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 * 22/08/2022 Port to DM
15 */
16
17#include <common.h>
18#include <dm.h>
19#include <wdt.h>
20#include <log.h>
21#include <asm/io.h>
22#include <faraday/ftwdt010_wdt.h>
23
24struct ftwdt010_wdt_priv {
25 struct ftwdt010_wdt __iomem *regs;
26};
27
28/*
29 * Set the watchdog time interval.
30 * Counter is 32 bit.
31 */
32static int ftwdt010_wdt_start(struct udevice *dev, u64 timeout_ms, ulong flags)
33{
34 struct ftwdt010_wdt_priv *priv = dev_get_priv(dev);
35 struct ftwdt010_wdt *wd = priv->regs;
36 unsigned int reg;
37
38 debug("Activating WDT %llu ms\n", timeout_ms);
39
40 /* Check if disabled */
41 if (readl(&wd->wdcr) & ~FTWDT010_WDCR_ENABLE) {
42 printf("sorry, watchdog is disabled\n");
43 return -1;
44 }
45
46 /*
47 * In a 66MHz system,
48 * if you set WDLOAD as 0x03EF1480 (66000000)
49 * the reset timer is 1 second.
50 */
51 reg = FTWDT010_WDLOAD(timeout_ms * FTWDT010_TIMEOUT_FACTOR);
52
53 writel(reg, &wd->wdload);
54
55 return 0;
56}
57
58static int ftwdt010_wdt_reset(struct udevice *dev)
59{
60 struct ftwdt010_wdt_priv *priv = dev_get_priv(dev);
61 struct ftwdt010_wdt *wd = priv->regs;
62
63 /* clear control register */
64 writel(0, &wd->wdcr);
65
66 /* Write Magic number */
67 writel(FTWDT010_WDRESTART_MAGIC, &wd->wdrestart);
68
69 /* Enable WDT */
70 writel((FTWDT010_WDCR_RST | FTWDT010_WDCR_ENABLE), &wd->wdcr);
71
72 return 0;
73}
74
75static int ftwdt010_wdt_stop(struct udevice *dev)
76{
77 struct ftwdt010_wdt_priv *priv = dev_get_priv(dev);
78 struct ftwdt010_wdt *wd = priv->regs;
79
80 debug("Deactivating WDT..\n");
81
82 /*
83 * It was defined with CONFIG_WATCHDOG_NOWAYOUT in Linux
84 *
85 * Shut off the timer.
86 * Lock it in if it's a module and we defined ...NOWAYOUT
87 */
88 writel(0, &wd->wdcr);
89 return 0;
90}
91
92static int ftwdt010_wdt_expire_now(struct udevice *dev, ulong flags)
93{
94 struct ftwdt010_wdt_priv *priv = dev_get_priv(dev);
95 struct ftwdt010_wdt *wd = priv->regs;
96
97 debug("Expiring WDT..\n");
98 writel(FTWDT010_WDLOAD(0), &wd->wdload);
99 return ftwdt010_wdt_reset(dev);
100}
101
102static int ftwdt010_wdt_probe(struct udevice *dev)
103{
104 struct ftwdt010_wdt_priv *priv = dev_get_priv(dev);
105
106 priv->regs = dev_read_addr_ptr(dev);
107 if (!priv->regs)
108 return -EINVAL;
109
110 return 0;
111}
112
113static const struct wdt_ops ftwdt010_wdt_ops = {
114 .start = ftwdt010_wdt_start,
115 .reset = ftwdt010_wdt_reset,
116 .stop = ftwdt010_wdt_stop,
117 .expire_now = ftwdt010_wdt_expire_now,
118};
119
120static const struct udevice_id ftwdt010_wdt_ids[] = {
121 { .compatible = "faraday,ftwdt010" },
122 {}
123};
124
125U_BOOT_DRIVER(ftwdt010_wdt) = {
126 .name = "ftwdt010_wdt",
127 .id = UCLASS_WDT,
128 .of_match = ftwdt010_wdt_ids,
129 .ops = &ftwdt010_wdt_ops,
130 .probe = ftwdt010_wdt_probe,
131 .priv_auto = sizeof(struct ftwdt010_wdt_priv),
132};