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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright 2017 Google, Inc
*/
#include <common.h>
#include <dm.h>
#include <errno.h>
#include <hang.h>
#include <log.h>
#include <time.h>
#include <wdt.h>
#include <asm/global_data.h>
#include <dm/device-internal.h>
#include <dm/lists.h>
DECLARE_GLOBAL_DATA_PTR;
#define WATCHDOG_TIMEOUT_SECS (CONFIG_WATCHDOG_TIMEOUT_MSECS / 1000)
/*
* Reset every 1000ms, or however often is required as indicated by a
* hw_margin_ms property.
*/
static ulong reset_period = 1000;
int initr_watchdog(void)
{
u32 timeout = WATCHDOG_TIMEOUT_SECS;
int ret;
/*
* Init watchdog: This will call the probe function of the
* watchdog driver, enabling the use of the device
*/
if (uclass_get_device_by_seq(UCLASS_WDT, 0,
(struct udevice **)&gd->watchdog_dev)) {
debug("WDT: Not found by seq!\n");
if (uclass_get_device(UCLASS_WDT, 0,
(struct udevice **)&gd->watchdog_dev)) {
printf("WDT: Not found!\n");
return 0;
}
}
if (CONFIG_IS_ENABLED(OF_CONTROL) && !CONFIG_IS_ENABLED(OF_PLATDATA)) {
timeout = dev_read_u32_default(gd->watchdog_dev, "timeout-sec",
WATCHDOG_TIMEOUT_SECS);
reset_period = dev_read_u32_default(gd->watchdog_dev,
"hw_margin_ms",
4 * reset_period) / 4;
}
if (!CONFIG_IS_ENABLED(WATCHDOG_AUTOSTART)) {
printf("WDT: Not starting\n");
return 0;
}
ret = wdt_start(gd->watchdog_dev, timeout * 1000, 0);
if (ret != 0) {
printf("WDT: Failed to start\n");
return 0;
}
printf("WDT: Started with%s servicing (%ds timeout)\n",
IS_ENABLED(CONFIG_WATCHDOG) ? "" : "out", timeout);
return 0;
}
int wdt_start(struct udevice *dev, u64 timeout_ms, ulong flags)
{
const struct wdt_ops *ops = device_get_ops(dev);
int ret;
if (!ops->start)
return -ENOSYS;
ret = ops->start(dev, timeout_ms, flags);
if (ret == 0)
gd->flags |= GD_FLG_WDT_READY;
return ret;
}
int wdt_stop(struct udevice *dev)
{
const struct wdt_ops *ops = device_get_ops(dev);
int ret;
if (!ops->stop)
return -ENOSYS;
ret = ops->stop(dev);
if (ret == 0)
gd->flags &= ~GD_FLG_WDT_READY;
return ret;
}
int wdt_reset(struct udevice *dev)
{
const struct wdt_ops *ops = device_get_ops(dev);
if (!ops->reset)
return -ENOSYS;
return ops->reset(dev);
}
int wdt_expire_now(struct udevice *dev, ulong flags)
{
int ret = 0;
const struct wdt_ops *ops;
debug("WDT Resetting: %lu\n", flags);
ops = device_get_ops(dev);
if (ops->expire_now) {
return ops->expire_now(dev, flags);
} else {
if (!ops->start)
return -ENOSYS;
ret = ops->start(dev, 1, flags);
if (ret < 0)
return ret;
hang();
}
return ret;
}
#if defined(CONFIG_WATCHDOG)
/*
* Called by macro WATCHDOG_RESET. This function be called *very* early,
* so we need to make sure, that the watchdog driver is ready before using
* it in this function.
*/
void watchdog_reset(void)
{
static ulong next_reset;
ulong now;
/* Exit if GD is not ready or watchdog is not initialized yet */
if (!gd || !(gd->flags & GD_FLG_WDT_READY))
return;
/* Do not reset the watchdog too often */
now = get_timer(0);
if (time_after_eq(now, next_reset)) {
next_reset = now + reset_period;
wdt_reset(gd->watchdog_dev);
}
}
#endif
static int wdt_post_bind(struct udevice *dev)
{
#if defined(CONFIG_NEEDS_MANUAL_RELOC)
struct wdt_ops *ops = (struct wdt_ops *)device_get_ops(dev);
static int reloc_done;
if (!reloc_done) {
if (ops->start)
ops->start += gd->reloc_off;
if (ops->stop)
ops->stop += gd->reloc_off;
if (ops->reset)
ops->reset += gd->reloc_off;
if (ops->expire_now)
ops->expire_now += gd->reloc_off;
reloc_done++;
}
#endif
return 0;
}
UCLASS_DRIVER(wdt) = {
.id = UCLASS_WDT,
.name = "watchdog",
.flags = DM_UC_FLAG_SEQ_ALIAS,
.post_bind = wdt_post_bind,
};
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