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[ARM] 4585/1: Correctly identify the CPU architecture version 

The cpu_architecture() function in arch/arm/kernel/setup.c only works
with cores produced by ARM Ltd. The more generic approach is to read
the ID_MMFR0 register and check for the VMSA or PMSA version
supported. With this patch, the ARM11MPCore would be reported as ARMv7
since its MMU is compatible with ARMv7.

Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Catalin Marinas 2007-09-25 16:49:45 +01:00 committed by Russell King
parent c1f438f5ee
commit 180005c4ef
1 changed files with 17 additions and 4 deletions
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21
arch/arm/kernel/setup.c
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@ -304,10 +304,23 @@ int cpu_architecture(void)
cpu_arch = (processor_id >> 16) & 7;
if (cpu_arch)
cpu_arch += CPU_ARCH_ARMv3;
} else {
/* the revised CPUID */
cpu_arch = ((processor_id >> 12) & 0xf) - 0xb + CPU_ARCH_ARMv6;
}
} else if ((processor_id & 0x000f0000) == 0x000f0000) {
unsigned int mmfr0;
/* Revised CPUID format. Read the Memory Model Feature
* Register 0 and check for VMSAv7 or PMSAv7 */
asm("mrc p15, 0, %0, c0, c1, 4"
: "=r" (mmfr0));
if ((mmfr0 & 0x0000000f) == 0x00000003 ||
(mmfr0 & 0x000000f0) == 0x00000030)
cpu_arch = CPU_ARCH_ARMv7;
else if ((mmfr0 & 0x0000000f) == 0x00000002 ||
(mmfr0 & 0x000000f0) == 0x00000020)
cpu_arch = CPU_ARCH_ARMv6;
else
cpu_arch = CPU_ARCH_UNKNOWN;
} else
cpu_arch = CPU_ARCH_UNKNOWN;
return cpu_arch;
}