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40d7f3c8d1
Some watchdog devices, e.g. external gpio-triggered ones, must be reset more often than once per second, which means that the current rate-limiting logic in watchdog_reset() fails to keep the board alive. gpio-wdt.txt in the linux source tree defines a "hw_margin_ms" property used to specifiy the maximum time allowed between resetting the device. Allow any watchdog device to specify such a property, and then use a reset period of one quarter of that. We keep the current default of resetting once every 1000ms. Signed-off-by: Rasmus Villemoes <rasmus.villemoes@prevas.dk> Reviewed-by: Stefan Roese <sr@denx.de>
163 lines
3.4 KiB
C
163 lines
3.4 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright 2017 Google, Inc
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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 <hang.h>
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#include <time.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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#define WATCHDOG_TIMEOUT_SECS (CONFIG_WATCHDOG_TIMEOUT_MSECS / 1000)
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/*
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* Reset every 1000ms, or however often is required as indicated by a
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* hw_margin_ms property.
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*/
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static ulong reset_period = 1000;
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int initr_watchdog(void)
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{
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u32 timeout = WATCHDOG_TIMEOUT_SECS;
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/*
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* Init watchdog: This will call the probe function of the
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* watchdog driver, enabling the use of the device
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*/
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if (uclass_get_device_by_seq(UCLASS_WDT, 0,
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(struct udevice **)&gd->watchdog_dev)) {
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debug("WDT: Not found by seq!\n");
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if (uclass_get_device(UCLASS_WDT, 0,
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(struct udevice **)&gd->watchdog_dev)) {
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printf("WDT: Not found!\n");
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return 0;
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}
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}
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if (CONFIG_IS_ENABLED(OF_CONTROL) && !CONFIG_IS_ENABLED(OF_PLATDATA)) {
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timeout = dev_read_u32_default(gd->watchdog_dev, "timeout-sec",
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WATCHDOG_TIMEOUT_SECS);
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reset_period = dev_read_u32_default(gd->watchdog_dev,
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"hw_margin_ms",
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4 * reset_period) / 4;
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}
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wdt_start(gd->watchdog_dev, timeout * 1000, 0);
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gd->flags |= GD_FLG_WDT_READY;
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printf("WDT: Started with%s servicing (%ds timeout)\n",
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IS_ENABLED(CONFIG_WATCHDOG) ? "" : "out", timeout);
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return 0;
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}
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int wdt_start(struct udevice *dev, u64 timeout_ms, 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_ms, 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 Resetting: %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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#if defined(CONFIG_WATCHDOG)
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/*
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* Called by macro WATCHDOG_RESET. This function be called *very* early,
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* so we need to make sure, that the watchdog driver is ready before using
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* it in this function.
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*/
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void watchdog_reset(void)
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{
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static ulong next_reset;
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ulong now;
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/* Exit if GD is not ready or watchdog is not initialized yet */
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if (!gd || !(gd->flags & GD_FLG_WDT_READY))
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return;
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/* Do not reset the watchdog too often */
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now = get_timer(0);
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if (time_after(now, next_reset)) {
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next_reset = now + reset_period;
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wdt_reset(gd->watchdog_dev);
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}
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}
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#endif
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static int wdt_post_bind(struct udevice *dev)
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{
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#if defined(CONFIG_NEEDS_MANUAL_RELOC)
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struct wdt_ops *ops = (struct wdt_ops *)device_get_ops(dev);
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static int reloc_done;
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if (!reloc_done) {
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if (ops->start)
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ops->start += gd->reloc_off;
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if (ops->stop)
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ops->stop += gd->reloc_off;
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if (ops->reset)
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ops->reset += gd->reloc_off;
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if (ops->expire_now)
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ops->expire_now += gd->reloc_off;
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reloc_done++;
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}
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#endif
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return 0;
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}
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UCLASS_DRIVER(wdt) = {
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.id = UCLASS_WDT,
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.name = "watchdog",
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.flags = DM_UC_FLAG_SEQ_ALIAS,
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.post_bind = wdt_post_bind,
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};
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