MIPS: asm: spram: Add new symbol for MIPS scratch pad storage

MIPS R6, just like MIPS R2, have scratch pad storage, so add a new
symbol which is selected by MIPS R2 and R6.

Link: http://www.linux-mips.org/archives/linux-mips/2015-01/msg00389.html
Cc: Maciej W. Rozycki <macro@linux-mips.org>
Signed-off-by: NMarkos Chandras <markos.chandras@imgtec.com>

arch/mips/Kconfig

@@ -1150,6 +1150,9 @@ config SOC_PNX8335
 	bool
 	select SOC_PNX833X
 
+config MIPS_SPRAM
+	bool
+
 config SWAP_IO_SPACE
 	bool
 
@@ -1821,10 +1824,12 @@ config CPU_MIPSR1
 config CPU_MIPSR2
 	bool
 	default y if CPU_MIPS32_R2 || CPU_MIPS64_R2 || CPU_CAVIUM_OCTEON
+	select MIPS_SPRAM
 
 config CPU_MIPSR6
 	bool
 	default y if CPU_MIPS32_R6 || CPU_MIPS64_R6
+	select MIPS_SPRAM
 
 config EVA
 	bool

arch/mips/include/asm/spram.h

 #ifndef _MIPS_SPRAM_H
 #define _MIPS_SPRAM_H
 
-#ifdef CONFIG_CPU_MIPSR2
+#if defined(CONFIG_MIPS_SPRAM)
 extern __init void spram_config(void);
 #else
 static inline void spram_config(void) { };
-#endif /* CONFIG_CPU_MIPSR2 */
+#endif /* CONFIG_MIPS_SPRAM */
 
 #endif /* _MIPS_SPRAM_H */

arch/mips/kernel/Makefile

@@ -52,7 +52,7 @@ obj-$(CONFIG_MIPS_MT_SMP)	+= smp-mt.o
 obj-$(CONFIG_MIPS_CMP)		+= smp-cmp.o
 obj-$(CONFIG_MIPS_CPS)		+= smp-cps.o cps-vec.o
 obj-$(CONFIG_MIPS_GIC_IPI)	+= smp-gic.o
-obj-$(CONFIG_CPU_MIPSR2)	+= spram.o
+obj-$(CONFIG_MIPS_SPRAM)	+= spram.o
 
 obj-$(CONFIG_MIPS_VPE_LOADER)	+= vpe.o
 obj-$(CONFIG_MIPS_VPE_LOADER_CMP) += vpe-cmp.o