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watchdog: Implement generic watchdog_reset() version

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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)
This commit is contained in:
Stefan Roese
2019-04-11 15:58:44 +02:00
parent 5edb9b2d71
commit 06985289d4
14 changed files with 82 additions and 259 deletions
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1
drivers/watchdog/Kconfig
View File

@@ -51,6 +51,7 @@ config ULP_WATCHDOG
config WDT
bool "Enable driver model for watchdog timer drivers"
depends on DM
imply WATCHDOG
help
Enable driver model for watchdog timer. At the moment the API
is very simple and only supports four operations:

26
drivers/watchdog/wdt-uclass.c
View File

@@ -10,6 +10,8 @@
#include <dm/device-internal.h>
#include <dm/lists.h>
DECLARE_GLOBAL_DATA_PTR;
int wdt_start(struct udevice *dev, u64 timeout_ms, ulong flags)
{
const struct wdt_ops *ops = device_get_ops(dev);
@@ -63,6 +65,30 @@ int wdt_expire_now(struct udevice *dev, ulong flags)
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 (now > next_reset) {
next_reset = now + 1000; /* reset every 1000ms */
wdt_reset(gd->watchdog_dev);
}
}
#endif
static int wdt_post_bind(struct udevice *dev)
{
#if defined(CONFIG_NEEDS_MANUAL_RELOC)