diff options
Diffstat (limited to 'arch/arc')
| -rw-r--r-- | arch/arc/cpu/arc700/cache.c | 29 | ||||
| -rw-r--r-- | arch/arc/include/asm/arcregs.h | 2 |
2 files changed, 31 insertions, 0 deletions
diff --git a/arch/arc/cpu/arc700/cache.c b/arch/arc/cpu/arc700/cache.c index 39d522d22f..fa19a13b7e 100644 --- a/arch/arc/cpu/arc700/cache.c +++ b/arch/arc/cpu/arc700/cache.c @@ -14,21 +14,34 @@ #define DC_CTRL_CACHE_DISABLE (1 << 0) #define DC_CTRL_INV_MODE_FLUSH (1 << 6) #define DC_CTRL_FLUSH_STATUS (1 << 8) +#define CACHE_VER_NUM_MASK 0xF int icache_status(void) { + /* If no cache in CPU exit immediately */ + if (!(read_aux_reg(ARC_BCR_IC_BUILD) & CACHE_VER_NUM_MASK)) + return 0; + return (read_aux_reg(ARC_AUX_IC_CTRL) & IC_CTRL_CACHE_DISABLE) != IC_CTRL_CACHE_DISABLE; } void icache_enable(void) { + /* If no cache in CPU exit immediately */ + if (!(read_aux_reg(ARC_BCR_IC_BUILD) & CACHE_VER_NUM_MASK)) + return; + write_aux_reg(ARC_AUX_IC_CTRL, read_aux_reg(ARC_AUX_IC_CTRL) & ~IC_CTRL_CACHE_DISABLE); } void icache_disable(void) { + /* If no cache in CPU exit immediately */ + if (!(read_aux_reg(ARC_BCR_IC_BUILD) & CACHE_VER_NUM_MASK)) + return; + write_aux_reg(ARC_AUX_IC_CTRL, read_aux_reg(ARC_AUX_IC_CTRL) | IC_CTRL_CACHE_DISABLE); } @@ -43,24 +56,40 @@ void invalidate_icache_all(void) int dcache_status(void) { + /* If no cache in CPU exit immediately */ + if (!(read_aux_reg(ARC_BCR_DC_BUILD) & CACHE_VER_NUM_MASK)) + return 0; + return (read_aux_reg(ARC_AUX_DC_CTRL) & DC_CTRL_CACHE_DISABLE) != DC_CTRL_CACHE_DISABLE; } void dcache_enable(void) { + /* If no cache in CPU exit immediately */ + if (!(read_aux_reg(ARC_BCR_DC_BUILD) & CACHE_VER_NUM_MASK)) + return; + write_aux_reg(ARC_AUX_DC_CTRL, read_aux_reg(ARC_AUX_DC_CTRL) & ~(DC_CTRL_INV_MODE_FLUSH | DC_CTRL_CACHE_DISABLE)); } void dcache_disable(void) { + /* If no cache in CPU exit immediately */ + if (!(read_aux_reg(ARC_BCR_DC_BUILD) & CACHE_VER_NUM_MASK)) + return; + write_aux_reg(ARC_AUX_DC_CTRL, read_aux_reg(ARC_AUX_DC_CTRL) | DC_CTRL_CACHE_DISABLE); } void flush_dcache_all(void) { + /* If no cache in CPU exit immediately */ + if (!(read_aux_reg(ARC_BCR_DC_BUILD) & CACHE_VER_NUM_MASK)) + return; + /* Do flush of entire cache */ write_aux_reg(ARC_AUX_DC_FLSH, 1); diff --git a/arch/arc/include/asm/arcregs.h b/arch/arc/include/asm/arcregs.h index 5d48d11bab..8ace87fa0f 100644 --- a/arch/arc/include/asm/arcregs.h +++ b/arch/arc/include/asm/arcregs.h @@ -24,6 +24,7 @@ #if (CONFIG_ARC_MMU_VER > 2) #define ARC_AUX_IC_PTAG 0x1E #endif +#define ARC_BCR_IC_BUILD 0x77 /* Timer related auxiliary registers */ #define ARC_AUX_TIMER0_CNT 0x21 /* Timer 0 count */ @@ -42,6 +43,7 @@ #if (CONFIG_ARC_MMU_VER > 2) #define ARC_AUX_DC_PTAG 0x5C #endif +#define ARC_BCR_DC_BUILD 0x72 #ifndef __ASSEMBLY__ /* Accessors for auxiliary registers */ |
