m68knommu: support ColdFire caches that do copyback and write-through

The version 3 and version 4 ColdFire cache controllers support both
write-through and copy-back modes on the data cache. Allow for Kconfig
time configuration of this, and set the cache mode appropriately.

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

1 files changed, 24 insertions, 0 deletions

diff --git a/arch/m68knommu/Kconfig b/arch/m68knommu/Kconfig
index 61c29081b998..89b12237e1ed 100644
--- a/arch/m68knommu/Kconfig
+++ b/arch/m68knommu/Kconfig
@@ -82,6 +82,9 @@ config COLDFIRE_SW_A7
 config HAVE_CACHE_SPLIT
         bool
 
+config HAVE_CACHE_CB
+        bool
+
 source "init/Kconfig"
 
 source "kernel/Kconfig.freezer"
@@ -172,27 +175,32 @@ config M528x
 config M5307
         bool "MCF5307"
         select COLDFIRE_SW_A7
+        select HAVE_CACHE_CB
         help
           Motorola ColdFire 5307 processor support.
 
 config M532x
         bool "MCF532x"
+        select HAVE_CACHE_CB
         help
           Freescale (Motorola) ColdFire 532x processor support.
 
 config M5407
         bool "MCF5407"
         select COLDFIRE_SW_A7
+        select HAVE_CACHE_CB
         help
           Motorola ColdFire 5407 processor support.
 
 config M547x
         bool "MCF547x"
+        select HAVE_CACHE_CB
         help
           Freescale ColdFire 5470/5471/5472/5473/5474/5475 processor support.
 
 config M548x
         bool "MCF548x"
+        select HAVE_CACHE_CB
         help
           Freescale ColdFire 5480/5481/5482/5483/5484/5485 processor support.
 
@@ -279,7 +287,23 @@ config CACHE_BOTH
           Split the ColdFire CPU cache, and use half as an instruction cache
           and half as a data cache.
 endchoice
+endif
+
+if HAVE_CACHE_CB
+choice
+        prompt "Data cache mode"
+        default CACHE_WRITETHRU
 
+config CACHE_WRITETHRU
+        bool "Write-through"
+        help
+          The ColdFire CPU cache is set into Write-through mode.
+
+config CACHE_COPYBACK
+        bool "Copy-back"
+        help
+          The ColdFire CPU cache is set into Copy-back mode.
+endchoice
 endif
 
 comment "Platform"