diff options
| author | Greg Ungerer <gerg@uclinux.org> | 2012-07-10 05:33:24 +0200 |
|---|---|---|
| committer | Greg Ungerer <gerg@uclinux.org> | 2012-07-17 07:49:34 +0200 |
| commit | f3ff6432dde9c0800754f1f144f6e864ac228214 (patch) | |
| tree | 16739657a2a113ceda333e428b393caf0e6774f1 | |
| parent | m68k: use simpler dma_alloc_coherent() for ColdFire CPUs (diff) | |
| download | linux-f3ff6432dde9c0800754f1f144f6e864ac228214.tar.xz linux-f3ff6432dde9c0800754f1f144f6e864ac228214.zip | |
m68k: fix ColdFire clear cache operation
The code for clearing (invalidating) the ColdFire cache is actually performing
a push operation. Add functions to clear the cache, and fix cache_clear() to
call the appropriate clear cache function.
Signed-off-by: Greg Ungerer <gerg@uclinux.org>
| -rw-r--r-- | arch/m68k/include/asm/cacheflush_mm.h | 41 | ||||
| -rw-r--r-- | arch/m68k/mm/memory.c | 2 |
2 files changed, 42 insertions, 1 deletions
diff --git a/arch/m68k/include/asm/cacheflush_mm.h b/arch/m68k/include/asm/cacheflush_mm.h index 8104bd874649..fa2c3d681d84 100644 --- a/arch/m68k/include/asm/cacheflush_mm.h +++ b/arch/m68k/include/asm/cacheflush_mm.h @@ -16,7 +16,48 @@ #define DCACHE_MAX_ADDR 0 #define DCACHE_SETMASK 0 #endif +#ifndef CACHE_MODE +#define CACHE_MODE 0 +#define CACR_ICINVA 0 +#define CACR_DCINVA 0 +#define CACR_BCINVA 0 +#endif + +/* + * ColdFire architecture has no way to clear individual cache lines, so we + * are stuck invalidating all the cache entries when we want a clear operation. + */ +static inline void clear_cf_icache(unsigned long start, unsigned long end) +{ + __asm__ __volatile__ ( + "movec %0,%%cacr\n\t" + "nop" + : + : "r" (CACHE_MODE | CACR_ICINVA | CACR_BCINVA)); +} + +static inline void clear_cf_dcache(unsigned long start, unsigned long end) +{ + __asm__ __volatile__ ( + "movec %0,%%cacr\n\t" + "nop" + : + : "r" (CACHE_MODE | CACR_DCINVA)); +} +static inline void clear_cf_bcache(unsigned long start, unsigned long end) +{ + __asm__ __volatile__ ( + "movec %0,%%cacr\n\t" + "nop" + : + : "r" (CACHE_MODE | CACR_ICINVA | CACR_BCINVA | CACR_DCINVA)); +} + +/* + * Use the ColdFire cpushl instruction to push (and invalidate) cache lines. + * The start and end addresses are cache line numbers not memory addresses. + */ static inline void flush_cf_icache(unsigned long start, unsigned long end) { unsigned long set; diff --git a/arch/m68k/mm/memory.c b/arch/m68k/mm/memory.c index 250b8b786f4f..51bc9d258ede 100644 --- a/arch/m68k/mm/memory.c +++ b/arch/m68k/mm/memory.c @@ -203,7 +203,7 @@ static inline void pushcl040(unsigned long paddr) void cache_clear (unsigned long paddr, int len) { if (CPU_IS_COLDFIRE) { - flush_cf_bcache(0, DCACHE_MAX_ADDR); + clear_cf_bcache(0, DCACHE_MAX_ADDR); } else if (CPU_IS_040_OR_060) { int tmp; |