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https://github.com/AsahiLinux/u-boot
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06985289d4
This patch tries to implement a generic watchdog_reset() function that can be used by all boards that want to service the watchdog device in U-Boot. This watchdog servicing is enabled via CONFIG_WATCHDOG. Without this approach, new boards or platforms needed to implement a board specific version of this functionality, mostly copy'ing the same code over and over again into their board or platforms code base. With this new generic function, the scattered other functions are now removed to be replaced by the generic one. The new version also enables the configuration of the watchdog timeout via the DT "timeout-sec" property (if enabled via CONFIG_OF_CONTROL). This patch also adds a new flag to the GD flags, to flag that the watchdog is ready to use and adds the pointer to the watchdog device to the GD. This enables us to remove the global "watchdog_dev" variable, which was prone to cause problems because of its potentially very early use in watchdog_reset(), even before the BSS is cleared. Signed-off-by: Stefan Roese <sr@denx.de> Cc: Heiko Schocher <hs@denx.de> Cc: Tom Rini <trini@konsulko.com> Cc: Michal Simek <michal.simek@xilinx.com> Cc: "Marek Behún" <marek.behun@nic.cz> Cc: Daniel Schwierzeck <daniel.schwierzeck@gmail.com> Cc: Maxim Sloyko <maxims@google.com> Cc: Erik van Luijk <evanluijk@interact.nl> Cc: Ryder Lee <ryder.lee@mediatek.com> Cc: Weijie Gao <weijie.gao@mediatek.com> Cc: Simon Glass <sjg@chromium.org> Cc: "Álvaro Fernández Rojas" <noltari@gmail.com> Cc: Philippe Reynes <philippe.reynes@softathome.com> Cc: Christophe Leroy <christophe.leroy@c-s.fr> Reviewed-by: Michal Simek <michal.simek@xilinx.com> Tested-by: Michal Simek <michal.simek@xilinx.com> (on zcu100)
119 lines
2.2 KiB
C
119 lines
2.2 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 <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_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 (now > next_reset) {
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next_reset = now + 1000; /* reset every 1000ms */
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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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