1 // SPDX-License-Identifier: GPL-2.0+
3 * Watchdog driver for the FTWDT010 Watch Dog Driver
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>
9 * Copyright (C) 2011 Andes Technology Corporation
10 * Macpaul Lin, Andes Technology Corporation <macpaul@andestech.com>
12 * 27/11/2004 Initial release, Faraday.
13 * 12/01/2011 Port to u-boot, Macpaul Lin.
14 * 22/08/2022 Port to DM
22 #include <faraday/ftwdt010_wdt.h>
24 struct ftwdt010_wdt_priv {
25 struct ftwdt010_wdt __iomem *regs;
28 static int ftwdt010_wdt_reset(struct udevice *dev)
30 struct ftwdt010_wdt_priv *priv = dev_get_priv(dev);
31 struct ftwdt010_wdt *wd = priv->regs;
33 debug("Reset WDT..\n");
35 /* clear control register */
38 /* Write Magic number */
39 writel(FTWDT010_WDRESTART_MAGIC, &wd->wdrestart);
42 writel(FTWDT010_WDCR_RST | FTWDT010_WDCR_ENABLE, &wd->wdcr);
48 * Set the watchdog time interval and start the timer.
51 static int ftwdt010_wdt_start(struct udevice *dev, u64 timeout_ms, ulong flags)
53 struct ftwdt010_wdt_priv *priv = dev_get_priv(dev);
54 struct ftwdt010_wdt *wd = priv->regs;
57 debug("Activating WDT %llu ms\n", timeout_ms);
59 /* Check if disabled */
60 if (readl(&wd->wdcr) & ~FTWDT010_WDCR_ENABLE) {
61 printf("sorry, watchdog is disabled\n");
67 * if you set WDLOAD as 0x03EF1480 (66000000)
68 * the reset timer is 1 second.
70 reg = FTWDT010_WDLOAD(timeout_ms * FTWDT010_TIMEOUT_FACTOR);
72 writel(reg, &wd->wdload);
74 return ftwdt010_wdt_reset(dev);
77 static int ftwdt010_wdt_stop(struct udevice *dev)
79 struct ftwdt010_wdt_priv *priv = dev_get_priv(dev);
80 struct ftwdt010_wdt *wd = priv->regs;
82 debug("Deactivating WDT..\n");
85 * It was defined with CONFIG_WATCHDOG_NOWAYOUT in Linux
88 * Lock it in if it's a module and we defined ...NOWAYOUT
94 static int ftwdt010_wdt_expire_now(struct udevice *dev, ulong flags)
96 struct ftwdt010_wdt_priv *priv = dev_get_priv(dev);
97 struct ftwdt010_wdt *wd = priv->regs;
99 debug("Expiring WDT..\n");
100 writel(FTWDT010_WDLOAD(0), &wd->wdload);
101 return ftwdt010_wdt_reset(dev);
104 static int ftwdt010_wdt_probe(struct udevice *dev)
106 struct ftwdt010_wdt_priv *priv = dev_get_priv(dev);
108 priv->regs = dev_read_addr_ptr(dev);
115 static const struct wdt_ops ftwdt010_wdt_ops = {
116 .start = ftwdt010_wdt_start,
117 .reset = ftwdt010_wdt_reset,
118 .stop = ftwdt010_wdt_stop,
119 .expire_now = ftwdt010_wdt_expire_now,
122 static const struct udevice_id ftwdt010_wdt_ids[] = {
123 { .compatible = "faraday,ftwdt010" },
127 U_BOOT_DRIVER(ftwdt010_wdt) = {
128 .name = "ftwdt010_wdt",
130 .of_match = ftwdt010_wdt_ids,
131 .ops = &ftwdt010_wdt_ops,
132 .probe = ftwdt010_wdt_probe,
133 .priv_auto = sizeof(struct ftwdt010_wdt_priv),