From f3ff6432dde9c0800754f1f144f6e864ac228214 Mon Sep 17 00:00:00 2001 From: Greg Ungerer Date: Tue, 10 Jul 2012 13:33:24 +1000 Subject: 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 --- arch/m68k/include/asm/cacheflush_mm.h | 41 +++++++++++++++++++++++++++++++++++ 1 file changed, 41 insertions(+) (limited to 'arch/m68k/include/asm/cacheflush_mm.h') 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; -- cgit