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authorHeiko Schocher <hs@denx.de>2010-09-17 13:10:30 +0200
committerWolfgang Denk <wd@denx.de>2010-09-19 19:29:51 +0200
commitc3330e9d6a11b6ead4a2346001338ce884b5832b (patch)
treef4fddc3272964e0cc047308533e6c2f642ee5870 /arch/arm/lib
parent880eff5cfb9df6f0855f4e48affd349ca64692e9 (diff)
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ARM (ARM926ejs): add data cache support, tested on magnesium and tx25 board
Enable "cache" command on tx25 and magnesium 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 -------------------------------------------------- magnesium 32,6s 22,5s 30s = x 1,09 tx25 (29MB only) 9,69s 5,05s 8,16s = x 1,19 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 -------------------------------------------------- magnesium 4,25s 2,08s 1,72s = x 2,47 tx25 4,82s 2,04s 1,84s = x 2,62 Portions of this work were supported by funding from the CE Linux Forum. Signed-off-by: Alessandro Rubini <rubini@gnudd.com> Signed-off-by: Heiko Schocher <hs@denx.de> Cc: Alessandro Rubini <rubini@gnudd.com>
Diffstat (limited to 'arch/arm/lib')
-rw-r--r--arch/arm/lib/cache.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/arch/arm/lib/cache.c b/arch/arm/lib/cache.c
index 61ee9d3..b36fd24 100644
--- a/arch/arm/lib/cache.c
+++ b/arch/arm/lib/cache.c
@@ -32,5 +32,11 @@ void flush_cache (unsigned long dummy1, unsigned long dummy2)
arm1136_cache_flush();
#endif
+#ifdef CONFIG_ARM926EJS
+ /* test and clean, page 2-23 of arm926ejs manual */
+ 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
return;
}