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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>
This commit is contained in:
Greg Ungerer 2012-07-10 13:33:24 +10:00
parent b60f187fec
commit f3ff6432dd
2 changed files with 42 additions and 1 deletions
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41
arch/m68k/include/asm/cacheflush_mm.h
View File

@ -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;

2
arch/m68k/mm/memory.c
View File

@ -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;