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ARM926EJS: Implement cache operations 

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Stefano Babic <sbabic@denx.de>
Acked-by: Stefano Babic <sbabic@denx.de>
This commit is contained in:
Marek Vasut 2012-03-15 18:33:17 +00:00 committed by Albert ARIBAUD
parent 4af7692026
commit a4aaad7048
1 changed files with 55 additions and 13 deletions
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68
arch/arm/cpu/arm926ejs/cache.c
View File

@ -23,29 +23,71 @@
#include <common.h>
#ifndef CONFIG_SYS_DCACHE_OFF
static inline void dcache_noop(void)
{
if (dcache_status()) {
puts("WARNING: cache operations are not implemented!\n"
"WARNING: disabling D-Cache now, you can re-enable it"
"later with 'dcache on' command\n");
dcache_disable();
}
}
#ifndef CONFIG_SYS_CACHELINE_SIZE
#define CONFIG_SYS_CACHELINE_SIZE 32
#endif
void invalidate_dcache_all(void)
{
dcache_noop();
asm volatile("mcr p15, 0, %0, c7, c6, 0\n"::"r"(0));
}
void flush_dcache_all(void)
{
asm volatile(
"0:"
"mrc p15, 0, r15, c7, c14, 3\n"
"bne 0b\n"
"mcr p15, 0, %0, c7, c10, 4\n"
::"r"(0):"memory"
);
}
static int check_cache_range(unsigned long start, unsigned long stop)
{
int ok = 1;
if (start & (CONFIG_SYS_CACHELINE_SIZE - 1))
ok = 0;
if (stop & (CONFIG_SYS_CACHELINE_SIZE - 1))
ok = 0;
if (!ok)
printf("CACHE: Misaligned operation at range [%08lx, %08lx]\n",
start, stop);
return ok;
}
void invalidate_dcache_range(unsigned long start, unsigned long stop)
{
dcache_noop();
if (!check_cache_range(start, stop))
return;
while (start < stop) {
asm volatile("mcr p15, 0, %0, c7, c6, 1\n"::"r"(start));
start += CONFIG_SYS_CACHELINE_SIZE;
}
}
void flush_dcache_range(unsigned long start, unsigned long stop)
{
dcache_noop();
if (!check_cache_range(start, stop))
return;
while (start < stop) {
asm volatile("mcr p15, 0, %0, c7, c14, 1\n"::"r"(start));
start += CONFIG_SYS_CACHELINE_SIZE;
}
asm("mcr p15, 0, %0, c7, c10, 4\n"::"r"(0));
}
void flush_cache(unsigned long start, unsigned long size)
{
flush_dcache_range(start, start + size);
}
#else /* #ifndef CONFIG_SYS_DCACHE_OFF */
void invalidate_dcache_all(void)
@ -64,7 +106,7 @@ void flush_dcache_range(unsigned long start, unsigned long stop)
{
}
void flush_cache(unsigned long start, unsigned long size)
void flush_cache(unsigned long start, unsigned long size)
{
}
#endif /* #ifndef CONFIG_SYS_DCACHE_OFF */