[ARM] 3377/2: add support for intel xsc3 core

Patch from Lennert Buytenhek

This patch adds support for the new XScale v3 core.  This is an
ARMv5 ISA core with the following additions:

- L2 cache
- I/O coherency support (on select chipsets)
- Low-Locality Reference cache attributes (replaces mini-cache)
- Supersections (v6 compatible)
- 36-bit addressing (v6 compatible)
- Single instruction cache line clean/invalidate
- LRU cache replacement (vs round-robin)

I attempted to merge the XSC3 support into proc-xscale.S, but XSC3
cores have separate errata and have to handle things like L2, so it
is simpler to keep it separate.

L2 cache support is currently a build option because the L2 enable
bit must be set before we enable the MMU and there is no easy way to
capture command line parameters at this point.

There are still optimizations that can be done such as using LLR for
copypage (in theory using the exisiting mini-cache code) but those
can be addressed down the road.

Signed-off-by: Deepak Saxena <dsaxena@plexity.net>
Signed-off-by: Lennert Buytenhek <buytenh@wantstofly.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 9 insertions, 0 deletions

diff --git a/include/asm-arm/page.h b/include/asm-arm/page.h
index 416320d95419..a404d2bf0c68 100644
--- a/include/asm-arm/page.h
+++ b/include/asm-arm/page.h
@@ -40,6 +40,7 @@
  *	  v4wb		- ARMv4 with writeback cache, without minicache
  *	  v4_mc		- ARMv4 with minicache
  *	  xscale	- Xscale
+ *	  xsc3		- XScalev3
  */
 #undef _USER
 #undef MULTI_USER
@@ -84,6 +85,14 @@
 # endif
 #endif
 
+#ifdef CONFIG_CPU_XSC3
+# ifdef _USER
+#  define MULTI_USER 1
+# else
+#  define _USER xsc3_mc
+# endif
+#endif
+
 #ifdef CONFIG_CPU_COPY_V6
 # define MULTI_USER 1
 #endif