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ArmPlatformPkg/SP805WatchdogDxe: switch to interrupt mode

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The SP805 watchdog driver doesn't implement the PI watchdog protocol
fully, but always simply resets the system if the watchdog time runs
out.

However, the hardware does support the intended usage model, as long
as the SP805 is wired up correctly. So let's implement interrupt based
mode involving a handler that is registered by the DXE core and invoked
when the watchdog runs out. In the interrupt handler, we invoke the
notify function if one was registered, before calling the ResetSystem()
runtime service (as per the UEFI spec)

Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Reviewed-by: Leif Lindholm <leif.lindholm@linaro.org>
This commit is contained in:
Ard Biesheuvel
2018-12-18 14:10:12 +01:00
parent e3fa3d83e7
commit 5afabd5ec3
3 changed files with 80 additions and 27 deletions
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ArmPlatformPkg/ArmPlatformPkg.dec
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@@ -70,6 +70,7 @@
## SP805 Watchdog
gArmPlatformTokenSpaceGuid.PcdSP805WatchdogBase|0x0|UINT32|0x00000023
gArmPlatformTokenSpaceGuid.PcdSP805WatchdogClockFrequencyInHz|32000|UINT32|0x00000021
gArmPlatformTokenSpaceGuid.PcdSP805WatchdogInterrupt|0|UINT32|0x0000002E
## PL011 UART
gArmPlatformTokenSpaceGuid.PL011UartClkInHz|24000000|UINT32|0x0000001F