ARM: cpu: Add ARMv7 barrier operations support

This enables ARMv7 barrier operations support when
march=armv7-a is enabled.

Using CP15 barriers causes U-Boot bootm command crash when
transferring control to the loaded image on Renesas R8A7794 Cortex A7 CPU.
Using ARMv7 barrier operations instead of the deprecated CP15 barriers
helps to avoid these issues.

Signed-off-by: Valentine Barshak <valentine.barshak+renesas@cogentembedded.com>
Signed-off-by: Vladimir Barinov <vladimir.barinov+renesas@cogentembedded.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Nobuhiro Iwamatsu <nobuhiro.iwamatsu.yj@renesas.com>

arch/arm/cpu/armv7/cache_v7.c

@@ -68,7 +68,7 @@ static void v7_inval_dcache_level_setway(u32 level, u32 num_sets,
 		}
 	}
 	/* DSB to make sure the operation is complete */
-	CP15DSB;
+	DSB;
 }
 
 static void v7_clean_inval_dcache_level_setway(u32 level, u32 num_sets,
@@ -96,7 +96,7 @@ static void v7_clean_inval_dcache_level_setway(u32 level, u32 num_sets,
 		}
 	}
 	/* DSB to make sure the operation is complete */
-	CP15DSB;
+	DSB;
 }
 
 static void v7_maint_dcache_level_setway(u32 level, u32 operation)
@@ -215,7 +215,7 @@ static void v7_dcache_maint_range(u32 start, u32 stop, u32 range_op)
 	}
 
 	/* DSB to make sure the operation is complete */
-	CP15DSB;
+	DSB;
 }
 
 /* Invalidate TLB */
@@ -228,9 +228,9 @@ static void v7_inval_tlb(void)
 	/* Invalidate entire instruction TLB */
 	asm volatile ("mcr p15, 0, %0, c8, c5, 0" : : "r" (0));
 	/* Full system DSB - make sure that the invalidation is complete */
-	CP15DSB;
+	DSB;
 	/* Full system ISB - make sure the instruction stream sees it */
-	CP15ISB;
+	ISB;
 }
 
 void invalidate_dcache_all(void)
@@ -343,10 +343,10 @@ void invalidate_icache_all(void)
 	asm volatile ("mcr p15, 0, %0, c7, c5, 6" : : "r" (0));
 
 	/* Full system DSB - make sure that the invalidation is complete */
-	CP15DSB;
+	DSB;
 
 	/* ISB - make sure the instruction stream sees it */
-	CP15ISB;
+	ISB;
 }
 #else
 void invalidate_icache_all(void)

arch/arm/include/asm/armv7.h

@@ -70,6 +70,16 @@
 #define CP15DSB	asm volatile ("mcr     p15, 0, %0, c7, c10, 4" : : "r" (0))
 #define CP15DMB	asm volatile ("mcr     p15, 0, %0, c7, c10, 5" : : "r" (0))
 
+#ifdef __ARM_ARCH_7A__
+#define ISB	asm volatile ("isb" : : : "memory")
+#define DSB	asm volatile ("dsb" : : : "memory")
+#define DMB	asm volatile ("dmb" : : : "memory")
+#else
+#define ISB	CP15ISB
+#define DSB	CP15DSB
+#define DMB	CP15DMB
+#endif
+
 /*
  * Workaround for ARM errata # 798870
  * Set L2ACTLR[7] to reissue any memory transaction in the L2 that has been