From c3330e9d6a11b6ead4a2346001338ce884b5832b Mon Sep 17 00:00:00 2001 From: Heiko Schocher Date: Fri, 17 Sep 2010 13:10:30 +0200 Subject: 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 Signed-off-by: Heiko Schocher Cc: Alessandro Rubini --- arch/arm/lib/cache.c | 6 ++++++ 1 file changed, 6 insertions(+) (limited to 'arch/arm/lib/cache.c') diff --git a/arch/arm/lib/cache.c b/arch/arm/lib/cache.c index 61ee9d3b13..b36fd24407 100644 --- a/arch/arm/lib/cache.c +++ b/arch/arm/lib/cache.c @@ -31,6 +31,12 @@ void flush_cache (unsigned long dummy1, unsigned long dummy2) void arm1136_cache_flush(void); 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; } -- cgit v1.2.1