On Wednesday 08 May 2013, Srinivas KANDAGATLA wrote: > From: Stuart Menefy <stuart.menefy@xxxxxx> > > This is a simple driver for the global timer module found in the Cortex > A9-MP cores from revision r1p0 onwards. This should be able to perform > the functions of the system timer and the local timer in an SMP system. > > The global timer has the following features: > The global timer is a 64-bit incrementing counter with an > auto-incrementing feature. It continues incrementing after sending > interrupts. The global timer is memory mapped in the private memory > region. > The global timer is accessible to all Cortex-A9 processors in the > cluster. Each Cortex-A9 processor has a private 64-bit comparator that > is used to assert a private interrupt when the global timer has reached > the comparator value. All the Cortex-A9 processors in a design use the > banked ID, ID27, for this interrupt. ID27 is sent to the Interrupt > Controller as a Private Peripheral Interrupt. The global timer is > clocked by PERIPHCLK. > > Signed-off-by: Stuart Menefy <stuart.menefy@xxxxxx> > Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@xxxxxx> > Are you sure we don't already have a driver for this? It sounds unlikely that you are the first one to do this when the hardware is so common. > Documentation/devicetree/bindings/arm/gt.txt | 21 ++ > arch/arm/Kconfig | 6 + > arch/arm/include/asm/global_timer.h | 12 + > arch/arm/kernel/Makefile | 1 + > arch/arm/kernel/global_timer.c | 325 ++++++++++++++++++++++++++ > 5 files changed, 365 insertions(+), 0 deletions(-) > create mode 100644 Documentation/devicetree/bindings/arm/gt.txt > create mode 100644 arch/arm/include/asm/global_timer.h > create mode 100644 arch/arm/kernel/global_timer.c Move it into drivers/clocksource? > diff --git a/arch/arm/include/asm/global_timer.h b/arch/arm/include/asm/global_timer.h > new file mode 100644 > index 0000000..46f9188 > --- /dev/null > +++ b/arch/arm/include/asm/global_timer.h > @@ -0,0 +1,12 @@ > +int __init global_timer_init(void __iomem *base, unsigned int timer_irq); I don't see a need to call this from platform code for non-DT platforms, it can easily be used with CLOCKSOURCE_OF_DECLARE() all the time I think. Arnd -- To unsubscribe from this list: send the line "unsubscribe linux-doc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
