From mboxrd@z Thu Jan 1 00:00:00 1970 From: hdoyu@nvidia.com (Hiroshi Doyu) Date: Wed, 9 Jan 2013 06:46:51 +0100 Subject: [v2 3/9] ARM: tegra: # of CPU cores detection w/ & w/o HAVE_ARM_SCU In-Reply-To: <20130108142651.GB3931@n2100.arm.linux.org.uk> References: <1357649263-1098-1-git-send-email-hdoyu@nvidia.com><1357649263-1098-4-git-send-email-hdoyu@nvidia.com><20130108142651.GB3931@n2100.arm.linux.org.uk> Message-ID: <20130109.074651.1513003283585604525.hdoyu@nvidia.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org Russell King - ARM Linux 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 > > --- > > 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 > > #include > > #include > > +#include > > > > #include > > > > @@ -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?