From 20072fd0c93349e19527dd2fa9588b4335960e62 Mon Sep 17 00:00:00 2001 From: Eric Miao Date: Fri, 6 Jun 2008 16:34:03 +0800 Subject: [PATCH] [ARM] pxa: add support for L2 outer cache on XScale3 MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit The initial patch from Lothar, and Lennert make it into a cleaner one, modified and tested on PXA320 by Eric Miao. This patch moves the L2 cache operations out of proc-xsc3.S into dedicated outer cache support code. CACHE_XSC3L2 can be deselected so no L2 cache specific code will be linked in, and that L2 enable bit will not be set, this applies to the following cases: a. _only_ PXA300/PXA310 support included and no L2 cache wanted b. PXA320 support included, but want L2 be disabled So the enabling of L2 depends on two things: - CACHE_XSC3L2 is selected - and L2 cache is present Where the latter is only a safeguard (previous testing shows it works OK even when this bit is turned on). IXP series of processors with XScale3 cannot disable L2 cache for the moment since they depend on the L2 cache for its coherent memory, so IXP may always select CACHE_XSC3L2. Other L2 relevant bits are always turned on (i.e. the original code enclosed by #if L2_CACHE_ENABLED .. #endif), as they showed no side effects. Specifically, these bits are: - OC bits in TTBASE register (table walk outer cache attributes) - LLR Outer Cache Attributes (OC) in Auxiliary Control Register Signed-off-by: Lothar WaÃ<9f>mann Signed-off-by: Lennert Buytenhek Signed-off-by: Eric Miao Signed-off-by: Russell King --- arch/arm/mm/Makefile | 2 ++ 1 file changed, 2 insertions(+) diff --git a/arch/arm/mm/Makefile b/arch/arm/mm/Makefile index 32b2d2d213a6..e7c14e399389 100644 --- a/arch/arm/mm/Makefile +++ b/arch/arm/mm/Makefile @@ -74,3 +74,5 @@ obj-$(CONFIG_CPU_V6) += proc-v6.o obj-$(CONFIG_CPU_V7) += proc-v7.o obj-$(CONFIG_CACHE_L2X0) += cache-l2x0.o +obj-$(CONFIG_CACHE_XSC3L2) += cache-xsc3l2.o + -- 2.20.1