linux-kernel - Re: [PATCH v2 30/31] arm64: Build infrastructure

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Message-ID: <20120817094602.GC24389@arm.com>
Date:	Fri, 17 Aug 2012 10:46:02 +0100
From:	Catalin Marinas <catalin.marinas@....com>
To:	Tony Lindgren <tony@...mide.com>
Cc:	"linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Arnd Bergmann <arnd@...db.de>,
	Will Deacon <Will.Deacon@....com>
Subject: Re: [PATCH v2 30/31] arm64: Build infrastructure

On Fri, Aug 17, 2012 at 10:32:13AM +0100, Tony Lindgren wrote:
> * Catalin Marinas <catalin.marinas@....com> [120814 11:00]:
> > --- /dev/null
> > +++ b/arch/arm64/Kconfig
> > @@ -0,0 +1,261 @@
> > +config ARM64
> > +	def_bool y
> > +	select OF
> > +	select OF_EARLY_FLATTREE
> > +	select IRQ_DOMAIN
> > +	select HAVE_AOUT
> > +	select HAVE_DMA_ATTRS
> > +	select HAVE_DMA_API_DEBUG
> > +	select HAVE_IDE
> > +	select HAVE_MEMBLOCK
> > +	select RTC_LIB
> > +	select SYS_SUPPORTS_APM_EMULATION
> > +	select HAVE_GENERIC_DMA_COHERENT
> > +	select GENERIC_IOMAP
> > +	select HAVE_IRQ_WORK
> > +	select HAVE_PERF_EVENTS
> > +	select HAVE_ARCH_TRACEHOOK
> > +	select PERF_USE_VMALLOC
> > +	select HAVE_HW_BREAKPOINT if PERF_EVENTS
> > +	select HAVE_GENERIC_HARDIRQS
> > +	select GENERIC_HARDIRQS_NO_DEPRECATED
> > +	select HAVE_SPARSE_IRQ
> > +	select SPARSE_IRQ
> > +	select GENERIC_IRQ_SHOW
> > +	select GENERIC_SMP_IDLE_THREAD
> > +	select NO_BOOTMEM
> > +	help
> > +	  ARM 64-bit (AArch64) Linux support.
> 
> Anything we should select here for ARM generic timers and
> interrupts assuming we can always expect to boot using those?

There is an entry in drivers/clocksource/Kconfig:

config CLKSRC_ARM_GENERIC
	def_bool y if ARM64

I will have something similar for the GIC but the model does not
currently support GICv3 to be able to test. I'll publish a branch with
example SoC code (for the model) and that adds GIC support into
drivers/irqchip/ with the address information from FDT. The per-CPU GIC
initialisation is done via a CPU notifier to decouple this from the SoC
code (I think even on 32-bit ARM it could be done in the same way,
gic_secondary_init() always takes 0 as argument.

-- 
Catalin
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