diff options
Diffstat (limited to 'arch/arc/cpu')
| -rw-r--r-- | arch/arc/cpu/arc700/cache.c | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/arch/arc/cpu/arc700/cache.c b/arch/arc/cpu/arc700/cache.c index 39d522d..fa19a13 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); |