1 // SPDX-License-Identifier: GPL-2.0+
3 * Copyright 2017 Google, Inc
12 #include <dm/device-internal.h>
15 DECLARE_GLOBAL_DATA_PTR;
17 #define WATCHDOG_TIMEOUT_SECS (CONFIG_WATCHDOG_TIMEOUT_MSECS / 1000)
20 * Reset every 1000ms, or however often is required as indicated by a
21 * hw_margin_ms property.
23 static ulong reset_period = 1000;
25 int initr_watchdog(void)
27 u32 timeout = WATCHDOG_TIMEOUT_SECS;
30 * Init watchdog: This will call the probe function of the
31 * watchdog driver, enabling the use of the device
33 if (uclass_get_device_by_seq(UCLASS_WDT, 0,
34 (struct udevice **)&gd->watchdog_dev)) {
35 debug("WDT: Not found by seq!\n");
36 if (uclass_get_device(UCLASS_WDT, 0,
37 (struct udevice **)&gd->watchdog_dev)) {
38 printf("WDT: Not found!\n");
43 if (CONFIG_IS_ENABLED(OF_CONTROL) && !CONFIG_IS_ENABLED(OF_PLATDATA)) {
44 timeout = dev_read_u32_default(gd->watchdog_dev, "timeout-sec",
45 WATCHDOG_TIMEOUT_SECS);
46 reset_period = dev_read_u32_default(gd->watchdog_dev,
48 4 * reset_period) / 4;
51 wdt_start(gd->watchdog_dev, timeout * 1000, 0);
52 gd->flags |= GD_FLG_WDT_READY;
53 printf("WDT: Started with%s servicing (%ds timeout)\n",
54 IS_ENABLED(CONFIG_WATCHDOG) ? "" : "out", timeout);
59 int wdt_start(struct udevice *dev, u64 timeout_ms, ulong flags)
61 const struct wdt_ops *ops = device_get_ops(dev);
66 return ops->start(dev, timeout_ms, flags);
69 int wdt_stop(struct udevice *dev)
71 const struct wdt_ops *ops = device_get_ops(dev);
76 return ops->stop(dev);
79 int wdt_reset(struct udevice *dev)
81 const struct wdt_ops *ops = device_get_ops(dev);
86 return ops->reset(dev);
89 int wdt_expire_now(struct udevice *dev, ulong flags)
92 const struct wdt_ops *ops;
94 debug("WDT Resetting: %lu\n", flags);
95 ops = device_get_ops(dev);
96 if (ops->expire_now) {
97 return ops->expire_now(dev, flags);
102 ret = ops->start(dev, 1, flags);
112 #if defined(CONFIG_WATCHDOG)
114 * Called by macro WATCHDOG_RESET. This function be called *very* early,
115 * so we need to make sure, that the watchdog driver is ready before using
116 * it in this function.
118 void watchdog_reset(void)
120 static ulong next_reset;
123 /* Exit if GD is not ready or watchdog is not initialized yet */
124 if (!gd || !(gd->flags & GD_FLG_WDT_READY))
127 /* Do not reset the watchdog too often */
129 if (time_after(now, next_reset)) {
130 next_reset = now + reset_period;
131 wdt_reset(gd->watchdog_dev);
136 static int wdt_post_bind(struct udevice *dev)
138 #if defined(CONFIG_NEEDS_MANUAL_RELOC)
139 struct wdt_ops *ops = (struct wdt_ops *)device_get_ops(dev);
140 static int reloc_done;
144 ops->start += gd->reloc_off;
146 ops->stop += gd->reloc_off;
148 ops->reset += gd->reloc_off;
150 ops->expire_now += gd->reloc_off;
158 UCLASS_DRIVER(wdt) = {
161 .flags = DM_UC_FLAG_SEQ_ALIAS,
162 .post_bind = wdt_post_bind,