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ARM V7 (OMAP): add data cache support, test on Beagle board

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Add data cache support for ARM V7 systems. Used cache flush
functions from linux:arch/arm/mm/cache-v7.S developed from
Catalin Marinas.

Enable "cache" command on Beagle board and test performance.

    Test 1: Loading 127 MB of data from NAND flash into RAM:

    Instr. Cache	off	on	on
      Data Cache	off	off	on
    --------------------------------------------------
    Beagle (Cortex A8)	116s	106s	30.3s	= x 3.8

    Test 2: uncompressing a gzipped image from RAM to RAM
            (size compressed: 6.5 MiB, uncompressed: 35 MiB):

    Instr. Cache	off	on	on
      Data Cache	off	off	on
    --------------------------------------------------
    Beagle (Cortex A8)	1.84s	1.64s	0.12s	= x 15.3

Portions of this work were supported by funding from
the CE Linux Forum.

Signed-off-by: Heiko Schocher <hs@denx.de>
Reviewed-by: Ben Gardiner<bengardiner@nanometrics.ca>
This commit is contained in:
Heiko Schocher
2010-09-17 13:10:31 +02:00
committed by Wolfgang Denk
parent c3330e9d6a
commit 95c6f6d34d
3 changed files with 86 additions and 0 deletions
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5
arch/arm/lib/cache.c
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@@ -37,6 +37,11 @@ void flush_cache (unsigned long dummy1, unsigned long dummy2)
asm("0: mrc p15, 0, r15, c7, c10, 3\n\t" "bne 0b\n" : : : "memory");
/* disable write buffer as well (page 2-22) */
asm("mcr p15, 0, %0, c7, c10, 4" : : "r" (0));
#endif
#ifdef CONFIG_ARMCORTEXA8
void v7_flush_cache_all(void);
v7_flush_cache_all();
#endif
return;
}