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libpayload: expose dcache_line_bytes() in ARM cache API

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This exposes the function that obtains cache line size so that it can
be used by drivers in DMA-related functions.

BUG=none
BRANCH=none
TEST=built and booted on nyan, nothing obvious broke
Signed-off-by: David Hendricks <dhendrix@chromium.org>

Change-Id: I9b0ddc36aa39084f0d621af064487d1b2ef3d023
Reviewed-on: https://chromium-review.googlesource.com/174099
Reviewed-by: Gabe Black <gabeblack@chromium.org>
Commit-Queue: David Hendricks <dhendrix@chromium.org>
Tested-by: David Hendricks <dhendrix@chromium.org>
This commit is contained in:
David Hendricks 2013-10-22 17:09:01 -07:00 • committed by chrome-internal-fetch
commit 9387b02dff
2 changed files with 12 additions and 6 deletions
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15
payloads/libpayload/arch/arm/cache.c
View file

@ -194,17 +194,20 @@ void dcache_invalidate_all(void)
dcache_foreach(OP_DCISW);
}
static unsigned int line_bytes(void)
unsigned int dcache_line_bytes(void)
{
uint32_t ccsidr;
unsigned int size;
static unsigned int line_bytes = 0;
if (line_bytes)
return line_bytes;
ccsidr = read_ccsidr();
/* [2:0] - Indicates (Log2(number of words in cache line)) - 2 */
size = 1 << ((ccsidr & 0x7) + 2); /* words per line */
size *= sizeof(unsigned int); /* bytes per line */
line_bytes = 1 << ((ccsidr & 0x7) + 2); /* words per line */
line_bytes *= sizeof(unsigned int); /* bytes per line */
return size;
return line_bytes;
}
/*
@ -217,7 +220,7 @@ static void dcache_op_mva(void const *addr, size_t len, enum dcache_op op)
{
unsigned long line, linesize;
linesize = line_bytes();
linesize = dcache_line_bytes();
line = (uint32_t)addr & ~(linesize - 1);
dsb();

3
payloads/libpayload/include/arm/arch/cache.h
View file

@ -304,6 +304,9 @@ void dcache_clean_all(void);
/* dcache invalidate all (on current level given by CCSELR) */
void dcache_invalidate_all(void);
/* returns number of bytes per cache line */
unsigned int dcache_line_bytes(void);
/* dcache and MMU disable */
void dcache_mmu_disable(void);