mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-07-07 11:46:17 +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>
77 lines
1.4 KiB
C
77 lines
1.4 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 <asm/state.h>
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#include <wdt.h>
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DECLARE_GLOBAL_DATA_PTR;
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static int sandbox_wdt_start(struct udevice *dev, u64 timeout, ulong flags)
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{
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struct sandbox_state *state = state_get_current();
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state->wdt.counter = timeout;
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state->wdt.running = true;
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return 0;
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}
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static int sandbox_wdt_stop(struct udevice *dev)
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{
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struct sandbox_state *state = state_get_current();
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state->wdt.running = false;
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return 0;
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}
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static int sandbox_wdt_reset(struct udevice *dev)
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{
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struct sandbox_state *state = state_get_current();
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state->wdt.reset_count++;
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return 0;
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}
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static int sandbox_wdt_expire_now(struct udevice *dev, ulong flags)
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{
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sandbox_wdt_start(dev, 1, flags);
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return 0;
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}
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static int sandbox_wdt_probe(struct udevice *dev)
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{
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struct sandbox_state *state = state_get_current();
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memset(&state->wdt, 0, sizeof(state->wdt));
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return 0;
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}
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static const struct wdt_ops sandbox_wdt_ops = {
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.start = sandbox_wdt_start,
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.reset = sandbox_wdt_reset,
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.stop = sandbox_wdt_stop,
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.expire_now = sandbox_wdt_expire_now,
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};
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static const struct udevice_id sandbox_wdt_ids[] = {
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{ .compatible = "sandbox,wdt" },
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{}
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};
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U_BOOT_DRIVER(wdt_sandbox) = {
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.name = "wdt_sandbox",
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.id = UCLASS_WDT,
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.of_match = sandbox_wdt_ids,
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.ops = &sandbox_wdt_ops,
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.probe = sandbox_wdt_probe,
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};
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