commit 0ef6c9b8f7bf62ea05be5b26ee14b18a116b0c2a
author Greg Ungerer <gerg@uclinux.org> Tue Nov 09 15:31:08 2010 +1000
committer Greg Ungerer <gerg@uclinux.org> Wed Jan 05 15:19:20 2011 +1000
tree 01ffb12226fef2f4de5f3408e21fe64e19b5a522
parent d475e3e4739ce465df740b51decbbea3b1b51823

m68knommu: support version 2 ColdFire split cache

The newer version 2 ColdFire CPU cores support a configurable cache
arrangement. The cache memory can be used as all instruction cache, all
data cache, or split in half for both instruction and data caching.
Support this setup via a Kconfig time menu that allows a kernel builder
to choose the arrangement they want to use.

Signed-off-by: Greg Ungerer <gerg@uclinux.org>

arch/m68k/include/asm/m52xxacr.h

diff --git a/arch/m68k/include/asm/m52xxacr.h b/arch/m68k/include/asm/m52xxacr.h
index 52230b5..701f680 100644
--- a/arch/m68k/include/asm/m52xxacr.h
+++ b/arch/m68k/include/asm/m52xxacr.h
@@ -53,23 +53,25 @@
 #define ACR_WPROTECT	0x00000004	/* Write protect region */
 
 /*
- * Set the cache controller settings we will use. This code is set to
- * only use the instruction cache, even on the controllers that support
- * split cache. (This setup is trying to preserve the existing behavior
- * for now, in the furture I hope to actually use the split cache mode).
+ * Set the cache controller settings we will use. On the cores that support
+ * a split cache configuration we allow all the combinations at Kconfig
+ * time. For those cores that only have an instruction cache we just set
+ * that as on.
  */
-#if defined(CONFIG_M5206) || defined(CONFIG_M5206e) || \
-    defined(CONFIG_M5249) || defined(CONFIG_M5272)
+#if defined(CONFIG_CACHE_I)
+#define CACHE_TYPE	CACR_DISD
+#elif defined(CONFIG_CACHE_D)
+#define CACHE_TYPE	CACR_DISI
+#else
+#define CACHE_TYPE
+#endif
+
+#if defined(CONFIG_HAVE_CACHE_SPLIT)
+#define CACHE_INIT	(CACR_CINV + CACHE_TYPE + CACR_EUSP)
+#define CACHE_MODE	(CACR_CENB + CACHE_TYPE + CACR_DCM + CACR_EUSP)
+#else
 #define CACHE_INIT	(CACR_CINV)
 #define CACHE_MODE	(CACR_CENB + CACR_DCM)
-#else
-#ifdef CONFIG_COLDFIRE_SW_A7
-#define CACHE_INIT	(CACR_CINV + CACR_DISD)
-#define CACHE_MODE	(CACR_CENB + CACR_DISD + CACR_DCM)
-#else
-#define CACHE_INIT	(CACR_CINV + CACR_DISD + CACR_EUSP)
-#define CACHE_MODE	(CACR_CENB + CACR_DISD + CACR_DCM + CACR_EUSP)
-#endif
 #endif
 
 #define CACHE_INVALIDATE (CACHE_MODE + CACR_CINV)