Hi,
2015-03-21 0:16 GMT+09:00 Vladimir Barinov vladimir.barinov@cogentembedded.com:
From: Valentine Barshak valentine.barshak@cogentembedded.com
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
Best regards, Nobuhiro
arch/arm/cpu/armv7/cache_v7.c | 14 +++++++------- arch/arm/include/asm/armv7.h | 10 ++++++++++ 2 files changed, 17 insertions(+), 7 deletions(-)
diff --git a/arch/arm/cpu/armv7/cache_v7.c b/arch/arm/cpu/armv7/cache_v7.c index 0f9d837..e8ee875 100644 --- a/arch/arm/cpu/armv7/cache_v7.c +++ b/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) diff --git a/arch/arm/include/asm/armv7.h b/arch/arm/include/asm/armv7.h index a13da23..189f3f0 100644 --- a/arch/arm/include/asm/armv7.h +++ b/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
-- 1.9.3
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