mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-08-20 00:48:52 +09:00
![Marek Vasut](/assets/img/avatar_default.png)
Use CONFIG_IS_ENABLED(WDT) to permit use of WDT in SPL without DM, while the full U-Boot can use rich DM/DT WDT driver. Signed-off-by: Marek Vasut <marex@denx.de> Cc: Peng Fan <Peng.Fan@freescale.com> Cc: Stefano Babic <sbabic@denx.de> Tested-by: Heiko Schocher <hs@denx.de> Tested-by: Suniel Mahesh <sunil.m@techveda.org>
148 lines
4.0 KiB
C
148 lines
4.0 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ */
|
|
/*
|
|
* Copyright 2017 Google, Inc
|
|
*/
|
|
|
|
#ifndef _WDT_H_
|
|
#define _WDT_H_
|
|
|
|
#include <dm.h>
|
|
#include <dm/read.h>
|
|
|
|
/*
|
|
* Implement a simple watchdog uclass. Watchdog is basically a timer that
|
|
* is used to detect or recover from malfunction. During normal operation
|
|
* the watchdog would be regularly reset to prevent it from timing out.
|
|
* If, due to a hardware fault or program error, the computer fails to reset
|
|
* the watchdog, the timer will elapse and generate a timeout signal.
|
|
* The timeout signal is used to initiate corrective action or actions,
|
|
* which typically include placing the system in a safe, known state.
|
|
*/
|
|
|
|
/*
|
|
* Start the timer
|
|
*
|
|
* @dev: WDT Device
|
|
* @timeout_ms: Number of ticks (milliseconds) before timer expires
|
|
* @flags: Driver specific flags. This might be used to specify
|
|
* which action needs to be executed when the timer expires
|
|
* @return: 0 if OK, -ve on error
|
|
*/
|
|
int wdt_start(struct udevice *dev, u64 timeout_ms, ulong flags);
|
|
|
|
/*
|
|
* Stop the timer, thus disabling the Watchdog. Use wdt_start to start it again.
|
|
*
|
|
* @dev: WDT Device
|
|
* @return: 0 if OK, -ve on error
|
|
*/
|
|
int wdt_stop(struct udevice *dev);
|
|
|
|
/*
|
|
* Reset the timer, typically restoring the counter to
|
|
* the value configured by start()
|
|
*
|
|
* @dev: WDT Device
|
|
* @return: 0 if OK, -ve on error
|
|
*/
|
|
int wdt_reset(struct udevice *dev);
|
|
|
|
/*
|
|
* Expire the timer, thus executing its action immediately.
|
|
* This is typically used to reset the board or peripherals.
|
|
*
|
|
* @dev: WDT Device
|
|
* @flags: Driver specific flags
|
|
* @return 0 if OK -ve on error. If wdt action is system reset,
|
|
* this function may never return.
|
|
*/
|
|
int wdt_expire_now(struct udevice *dev, ulong flags);
|
|
|
|
/*
|
|
* struct wdt_ops - Driver model wdt operations
|
|
*
|
|
* The uclass interface is implemented by all wdt devices which use
|
|
* driver model.
|
|
*/
|
|
struct wdt_ops {
|
|
/*
|
|
* Start the timer
|
|
*
|
|
* @dev: WDT Device
|
|
* @timeout_ms: Number of ticks (milliseconds) before the timer expires
|
|
* @flags: Driver specific flags. This might be used to specify
|
|
* which action needs to be executed when the timer expires
|
|
* @return: 0 if OK, -ve on error
|
|
*/
|
|
int (*start)(struct udevice *dev, u64 timeout_ms, ulong flags);
|
|
/*
|
|
* Stop the timer
|
|
*
|
|
* @dev: WDT Device
|
|
* @return: 0 if OK, -ve on error
|
|
*/
|
|
int (*stop)(struct udevice *dev);
|
|
/*
|
|
* Reset the timer, typically restoring the counter to
|
|
* the value configured by start()
|
|
*
|
|
* @dev: WDT Device
|
|
* @return: 0 if OK, -ve on error
|
|
*/
|
|
int (*reset)(struct udevice *dev);
|
|
/*
|
|
* Expire the timer, thus executing the action immediately (optional)
|
|
*
|
|
* If this function is not provided, a default implementation
|
|
* will be used, which sets the counter to 1
|
|
* and waits forever. This is good enough for system level
|
|
* reset, where the function is not expected to return, but might not be
|
|
* good enough for other use cases.
|
|
*
|
|
* @dev: WDT Device
|
|
* @flags: Driver specific flags
|
|
* @return 0 if OK -ve on error. May not return.
|
|
*/
|
|
int (*expire_now)(struct udevice *dev, ulong flags);
|
|
};
|
|
|
|
#if CONFIG_IS_ENABLED(WDT)
|
|
#ifndef CONFIG_WATCHDOG_TIMEOUT_MSECS
|
|
#define CONFIG_WATCHDOG_TIMEOUT_MSECS (60 * 1000)
|
|
#endif
|
|
#define WATCHDOG_TIMEOUT_SECS (CONFIG_WATCHDOG_TIMEOUT_MSECS / 1000)
|
|
|
|
static inline int initr_watchdog(void)
|
|
{
|
|
u32 timeout = WATCHDOG_TIMEOUT_SECS;
|
|
|
|
/*
|
|
* 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)) {
|
|
timeout = dev_read_u32_default(gd->watchdog_dev, "timeout-sec",
|
|
WATCHDOG_TIMEOUT_SECS);
|
|
}
|
|
|
|
wdt_start(gd->watchdog_dev, timeout * 1000, 0);
|
|
gd->flags |= GD_FLG_WDT_READY;
|
|
printf("WDT: Started with%s servicing (%ds timeout)\n",
|
|
IS_ENABLED(CONFIG_WATCHDOG) ? "" : "out", timeout);
|
|
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
#endif /* _WDT_H_ */
|