From: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
To: Sascha Hauer <s.hauer@pengutronix.de>
Cc: barebox@lists.infradead.org
Subject: Re: [PATCH 1/1] arm: add generic smp twd timer
Date: Thu, 4 Oct 2012 11:54:15 +0200 [thread overview]
Message-ID: <20121004095415.GI26553@game.jcrosoft.org> (raw)
In-Reply-To: <20121004072432.GG1322@pengutronix.de>
On 09:24 Thu 04 Oct , Sascha Hauer wrote:
> On Thu, Oct 04, 2012 at 09:01:33AM +0200, Jean-Christophe PLAGNIOL-VILLARD wrote:
> > on Cortex A9 and Cortex A5 we have a generic timer which we can use as
> > clocksource
> >
> > Limit the timer frequency to < 25Mhz
> >
> > Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
> > ---
> > arch/arm/cpu/Kconfig | 3 ++
> > arch/arm/cpu/Makefile | 1 +
> > arch/arm/cpu/smp_twd.c | 93 ++++++++++++++++++++++++++++++++++++++++
> > arch/arm/include/asm/smp_twd.h | 23 ++++++++++
> > 4 files changed, 120 insertions(+)
> > create mode 100644 arch/arm/cpu/smp_twd.c
> > create mode 100644 arch/arm/include/asm/smp_twd.h
> >
> > diff --git a/arch/arm/cpu/Kconfig b/arch/arm/cpu/Kconfig
> > index f55e862..a7a1cdb 100644
> > --- a/arch/arm/cpu/Kconfig
> > +++ b/arch/arm/cpu/Kconfig
> > @@ -94,3 +94,6 @@ config CACHE_L2X0
> > bool "Enable L2x0 PrimeCell"
> > depends on MMU && ARCH_HAS_L2X0
> >
> > +config ARM_SMP_TWD
> > + bool
> > + depends on CPU_V7
> > diff --git a/arch/arm/cpu/Makefile b/arch/arm/cpu/Makefile
> > index f7ab276..c5cbdfb 100644
> > --- a/arch/arm/cpu/Makefile
> > +++ b/arch/arm/cpu/Makefile
> > @@ -18,5 +18,6 @@ pbl-$(CONFIG_CPU_32v6) += cache-armv6.o
> > obj-$(CONFIG_CPU_32v7) += cache-armv7.o
> > pbl-$(CONFIG_CPU_32v7) += cache-armv7.o
> > obj-$(CONFIG_CACHE_L2X0) += cache-l2x0.o
> > +obj-$(CONFIG_ARM_SMP_TWD) += smp_twd.o
> >
> > pbl-y += start-pbl.o
> > diff --git a/arch/arm/cpu/smp_twd.c b/arch/arm/cpu/smp_twd.c
>
> I was thinking about a drivers/clocksource directory. Maybe this would
> be a good opportunity to start it?
I was thining about it too as I've the same timer on SH and ARM and nomadik
and ux5x0
Best Regards,
J.
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prev parent reply other threads:[~2012-10-04 9:56 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-10-04 7:01 Jean-Christophe PLAGNIOL-VILLARD
2012-10-04 7:24 ` Sascha Hauer
2012-10-04 9:54 ` Jean-Christophe PLAGNIOL-VILLARD [this message]
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