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imx233: add hardware and software watchdog

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The hardware watchdog automatically shutdown the device after 10s of
inactivity, being defined as 10s without the tick IRQ fired (aka braindead
device).
The software IRQ mechanism is more interesting: it uses a very high priority
timer setup as one-shot to trigger after 5s of inactivity (but IRQ still
enabled). When detected, it patches the running code to insert a SWI
instruction so that on interrupt return it will trigger a SWI and produce
a meaningfull backtrace to debug the deadlock. This should allow to debug
freezes in IRQ context.

Change-Id: Ic55dad01201676bfb6dd79e78e535c6707cb88e6
This commit is contained in:
Amaury Pouly 2014-02-02 04:31:54 +01:00
parent 1a06292e41
commit 6d64111b3c
4 changed files with 58 additions and 1 deletions
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1
firmware/target/arm/imx233/timrot-imx233.h
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@ -32,6 +32,7 @@ enum
{
TIMER_TICK, /* for tick task */
TIMER_USER, /* for user timer */
TIMER_WATCHDOG, /* for watchdog */
};
struct imx233_timrot_info_t