[v2 3/9] ARM: tegra: # of CPU cores detection w/ & w/o HAVE_ARM_SCU

[Joseph Lo]

On Wed, 2013-01-09 at 13:46 +0800, Hiroshi Doyu wrote:
> Russell King - ARM Linux <linux at arm.linux.org.uk> wrote @ Tue, 8 Jan 2013 15:26:51 +0100:
> 
> > On Tue, Jan 08, 2013 at 02:47:37PM +0200, Hiroshi Doyu wrote:
> > > The method to detect the number of CPU cores on Cortex-A9 MPCore and
> > > Cortex-A15 MPCore is different. On Cortex-A9 MPCore we can get this
> > > information from the Snoop Control Unit(SCU). On Cortex-A15 MPCore we
> > > have to read it from the system coprocessor(CP15), because the SCU on
> > > Cortex-A15 MPCore does not have software readable registers. This
> > > patch selects the correct method at runtime based on the CPU ID.
> > > 
> > > Signed-off-by: Hiroshi Doyu <hdoyu at nvidia.com>
> > > ---
> > >  arch/arm/mach-tegra/platsmp.c |   31 ++++++++++++++++++++++++++++---
> > >  1 file changed, 28 insertions(+), 3 deletions(-)
> > > 
> > > diff --git a/arch/arm/mach-tegra/platsmp.c b/arch/arm/mach-tegra/platsmp.c
> > > index 1b926df..68e76ef 100644
> > > --- a/arch/arm/mach-tegra/platsmp.c
> > > +++ b/arch/arm/mach-tegra/platsmp.c
> > > @@ -23,6 +23,7 @@
> > >  #include <asm/hardware/gic.h>
> > >  #include <asm/mach-types.h>
> > >  #include <asm/smp_scu.h>
> > > +#include <asm/cputype.h>
> > >  
> > >  #include <mach/powergate.h>
> > >  
> > > @@ -34,9 +35,13 @@
> > >  #include "common.h"
> > >  #include "iomap.h"
> > >  
> > > +#define CPU_MASK		0xff0ffff0
> > > +#define CPU_CORTEX_A9		0x410fc090
> > > +#define CPU_CORTEX_A15		0x410fc0f0
> > 
> > NAK. There's some patches around to make this stuff generic, we don't
> > need more ifdefs springing up.  We need to get those generic patches
> > in.
> 
> Does anyone give some pointers to the above patches?

Hi Hiroshi,

Please check "arch/arm/include/asm/cputype.h" in next-20130109. It just
be merged.