linux-toradex.git/drivers/clocksource/sh_cmt.c, branch v2.6.33.5

clocksource: Fix up a registration/IRQ race in the sh drivers.

2010-03-15T16:06:02+00:00

commit da64c2a8dee66ca03f4f3e15d84be7bedf73db3d upstream.

All of the SH clocksource drivers follow the scheme that the IRQ is setup
prior to registering the clockevent. The interrupt handler in the
clockevent cases looks to the event handler function pointer being filled
in by the registration code, permitting us to get in to situations where
asserted IRQs step in to the handler before registration has had a chance
to complete and hitting a NULL pointer deref.

In practice this is not an issue for most platforms, but some of them
with fairly special loaders (or that are chain-loading from another
kernel) may enter in to this situation. This fixes up the oops reported
by Rafael on hp6xx.

Reported-and-tested-by: Rafael Ignacio Zurita 
Signed-off-by: Paul Mundt 
Signed-off-by: Greg Kroah-Hartman

sh: CMT suspend/resume

2009-08-15T03:58:45+00:00

This patch updates the SuperH CMT driver with suspend and resume
callbacks for the suspend-to-ram case. This patch stops the CMT
channel at suspend time to avoid unwanted wake up events.

Signed-off-by: Magnus Damm 
Signed-off-by: Paul Mundt

sh: turn off irqs when disabling CMT/TMU timers

2009-06-17T06:39:56+00:00

Modify the CMT and TMU drivers to disable interrupts when
disabling the timer. Only using start/stop bits is not
enough.

This fixes a bootup hang on Migo-R when the CMT is replaced
by TMU for clockevents but the CMT keeps on delivering irqs
even though the timer start bit is off.

Signed-off-by: Magnus Damm 
Signed-off-by: Paul Mundt

clocksource: Drop unused irqaction.mask from SH drivers.

2009-06-14T12:18:24+00:00

The irqaction.mask is legacy code that is wholly unused and going away,
so simply drop its use in the SH drivers completely.

Fixes up build failures in -next.

Signed-off-by: Paul Mundt

clocksource: sh_mtu2/cmt_register() should be static.

2009-05-03T09:05:42+00:00

Neither of these need to be exported, so just make them static.

Signed-off-by: Paul Mundt

sh: Consolidate MTU2/CMT/TMU timer platform data.

2009-05-03T08:57:17+00:00

All of the SH timers use a roughly identical structure for platform data,
which presently is broken out for each block. Consolidate all of these
definitions, as there is no reason for them to be broken out in the first
place.

Signed-off-by: Paul Mundt

clocksource: sh_cmt 16-bit fixes

2009-04-30T03:57:30+00:00

This patch contains various fixes for 16-bit cmt hardware.
With this applied periodic clockevents work fine on sh7203.

Signed-off-by: Magnus Damm 
Signed-off-by: Paul Mundt

sh: setup timers in late_time_init()

2009-04-28T09:01:25+00:00

This patch moves the SuperH timer setup code from time_init()
to late_time_init(). Good things about this change:
 - interrupts: they are enabled at late_time_init()
 - mm: regular kmalloc() can be used at late_time_init()

Together with moving to late_time_init() this patch changes
the sh_cmt driver to always allocate with kmalloc(). This
simplifies the code a bit and also fixes section mismatches.

Signed-off-by: Magnus Damm 
Signed-off-by: Paul Mundt

clocksource: improve sh_cmt clocksource overflow handling

2009-04-28T09:01:21+00:00

This patch improves the sh_cmt clocksource handling.

Currently the counter value is ignored in the case of
overflow. With this patch the overflow flag is read
before and after reading the counter, removing any
counter value and overflow flag mismatch issues.

Signed-off-by: Magnus Damm 
Signed-off-by: Paul Mundt

clocksource: sh_cmt clocksource support

2009-04-22T00:31:04+00:00

Add clocksource support to the sh_cmt driver. With this in
place we can do tickless with a single CMT channel.

Signed-off-by: Magnus Damm 
Signed-off-by: Paul Mundt