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ARM: 8015/1: Add cpu_is_pj4 to distinguish PJ4 because it has some differences with V7

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The patch add cpu_is_pj4 at arch/arm/include/asm/cputype.h
PJ4 has some differences with V7, for example the coprocessor.
To disinguish this kind of situation. cpu_is_pj4 is needed.

Signed-off-by: Chao Xie <chao.xie@marvell.com>
Reviewed-by: Kevin Hilman <khilman@linaro.org>
Tested-by: Kevin Hilman <khilman@linaro.org>
Tested-by: Stephen Warren <swarren@nvidia.com>
Reviewed-by: Stephen Warren <swarren@nvidia.com>
Tested-by: Matt Porter <mporter@linaro.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Chao Xie Linux 2014-04-02 02:47:09 +01:00 committed by Russell King
parent 779dd9590b
commit fdb487f5c9
1 changed files with 19 additions and 0 deletions
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19
arch/arm/include/asm/cputype.h
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@ -221,4 +221,23 @@ static inline int cpu_is_xsc3(void)
#define cpu_is_xscale() 1
#endif
/*
* Marvell's PJ4 core is based on V7 version. It has some modification
* for coprocessor setting. For this reason, we need a way to distinguish
* it.
*/
#ifndef CONFIG_CPU_PJ4
#define cpu_is_pj4() 0
#else
static inline int cpu_is_pj4(void)
{
unsigned int id;
id = read_cpuid_id();
if ((id & 0xfffffff0) == 0x562f5840)
return 1;
return 0;
}
#endif
#endif