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wdt_qmsi: Implement suspend and resume functions

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In order to restore watchdog context after entering
SYS_PM_DEEP_SLEEP, suspend and resume functions
are called.

The following parameters are restored:
 - All registers for the WDT device.
 - Watchdog interrupt mask.

The suspend/resume functionality is implemented in
the QMSI shim layer as a fast and temporary solution,
it will be removed and migrated to QMSI later.

Change-Id: I6e4e30a797b0ca38ce727d50fa51d1b2f8330405
Signed-off-by: Julien Delayen <julien.delayen@intel.com>
This commit is contained in:
Julien Delayen 2016-08-09 09:02:59 +01:00 committed by Anas Nashif
parent fa175975e9
commit 0392d79845
1 changed files with 42 additions and 2 deletions
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44
drivers/watchdog/wdt_qmsi.c
View file

@ -18,6 +18,7 @@
#include <device.h>
#include <watchdog.h>
#include <ioapic.h>
#include <power.h>
#include "clk.h"
#include "qm_interrupt.h"
@ -149,6 +150,45 @@ static int init(struct device *dev)
return 0;
}
DEVICE_AND_API_INIT(wdt, CONFIG_WDT_0_NAME, init, WDT_CONTEXT, 0,
PRIMARY, CONFIG_KERNEL_INIT_PRIORITY_DEVICE,
#ifdef CONFIG_DEVICE_POWER_MANAGEMENT
struct wdt_ctx {
uint32_t wdt_cr;
uint32_t wdt_torr;
uint32_t int_watchdog_mask;
};
static struct wdt_ctx wdt_ctx_save;
static int wdt_suspend_device(struct device *dev, int pm_policy)
{
if (pm_policy == SYS_PM_DEEP_SLEEP) {
wdt_ctx_save.wdt_torr = QM_WDT[QM_WDT_0].wdt_torr;
wdt_ctx_save.wdt_cr = QM_WDT[QM_WDT_0].wdt_cr;
wdt_ctx_save.int_watchdog_mask =
QM_SCSS_INT->int_watchdog_mask;
}
return 0;
}
static int wdt_resume_device(struct device *dev, int pm_policy)
{
if (pm_policy == SYS_PM_DEEP_SLEEP) {
/* TOP_INIT field has to be written before
* the Watchdog Timer is enabled.
*/
QM_WDT[QM_WDT_0].wdt_torr = wdt_ctx_save.wdt_torr;
QM_WDT[QM_WDT_0].wdt_cr = wdt_ctx_save.wdt_cr;
QM_SCSS_INT->int_watchdog_mask =
wdt_ctx_save.int_watchdog_mask;
}
return 0;
}
#endif
DEFINE_DEVICE_PM_OPS(wdt, wdt_suspend_device, wdt_resume_device);
DEVICE_AND_API_INIT_PM(wdt, CONFIG_WDT_0_NAME, init, DEVICE_PM_OPS_GET(wdt),
WDT_CONTEXT, 0, PRIMARY, CONFIG_KERNEL_INIT_PRIORITY_DEVICE,
(void *)&api);