mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-07-06 11:16:15 +09:00
0753bc2d30
This is a simple uclass for Watchdog Timers. It has four operations: start, restart, reset, stop. Drivers must implement start, restart and stop operations, while implementing reset is optional: It's default implementation expires watchdog timer in one clock tick. Signed-off-by: Maxim Sloyko <maxims@google.com> Reviewed-by: Simon Glass <sjg@chromium.org>
73 lines
1.1 KiB
C
73 lines
1.1 KiB
C
/*
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* Copyright 2017 Google, Inc
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <common.h>
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#include <dm.h>
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#include <errno.h>
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#include <wdt.h>
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#include <dm/device-internal.h>
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#include <dm/lists.h>
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DECLARE_GLOBAL_DATA_PTR;
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int wdt_start(struct udevice *dev, u64 timeout, ulong flags)
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{
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const struct wdt_ops *ops = device_get_ops(dev);
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if (!ops->start)
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return -ENOSYS;
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return ops->start(dev, timeout, flags);
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}
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int wdt_stop(struct udevice *dev)
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{
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const struct wdt_ops *ops = device_get_ops(dev);
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if (!ops->stop)
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return -ENOSYS;
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return ops->stop(dev);
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}
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int wdt_reset(struct udevice *dev)
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{
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const struct wdt_ops *ops = device_get_ops(dev);
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if (!ops->reset)
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return -ENOSYS;
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return ops->reset(dev);
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}
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int wdt_expire_now(struct udevice *dev, ulong flags)
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{
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int ret = 0;
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const struct wdt_ops *ops;
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debug("WDT Resettting: %lu\n", flags);
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ops = device_get_ops(dev);
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if (ops->expire_now) {
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return ops->expire_now(dev, flags);
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} else {
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if (!ops->start)
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return -ENOSYS;
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ret = ops->start(dev, 1, flags);
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if (ret < 0)
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return ret;
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hang();
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}
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return ret;
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}
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UCLASS_DRIVER(wdt) = {
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.id = UCLASS_WDT,
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.name = "wdt",
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};
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