MN10300: AM34: Add cacheflushing by using the AM34 purge registers

The AM34 CPU core provides an automated way of purging the cache rather than
manually iterating over all the tags in the cache.  Make it possible to use
these.

Signed-off-by: Akira Takeuchi <takeuchi.akr@jp.panasonic.com>
Signed-off-by: Kiyoshi Owada <owada.kiyoshi@jp.panasonic.com>
Signed-off-by: David Howells <dhowells@redhat.com>

1 files changed, 12 insertions, 1 deletions

diff --git a/arch/mn10300/mm/Kconfig.cache b/arch/mn10300/mm/Kconfig.cache
index aa6ff0791138..97adc06e7128 100644
--- a/arch/mn10300/mm/Kconfig.cache
+++ b/arch/mn10300/mm/Kconfig.cache
@@ -37,7 +37,8 @@ config MN10300_CACHE_ENABLED
 
 choice
         prompt "CPU cache flush/invalidate method"
-        default MN10300_CACHE_MANAGE_BY_TAG
+        default MN10300_CACHE_MANAGE_BY_TAG if !AM34_2
+        default MN10300_CACHE_MANAGE_BY_REG if AM34_2
         depends on MN10300_CACHE_ENABLED
         help
           This determines the method by which CPU cache flushing and
@@ -46,10 +47,20 @@ choice
 config MN10300_CACHE_MANAGE_BY_TAG
         bool "Use the cache tag registers directly"
 
+config MN10300_CACHE_MANAGE_BY_REG
+        bool "Flush areas by way of automatic purge registers (AM34 only)"
+        depends on AM34_2
+
 endchoice
 
 config MN10300_CACHE_INV_BY_TAG
         def_bool y if MN10300_CACHE_MANAGE_BY_TAG && MN10300_CACHE_ENABLED
 
+config MN10300_CACHE_INV_BY_REG
+        def_bool y if MN10300_CACHE_MANAGE_BY_REG && MN10300_CACHE_ENABLED
+
 config MN10300_CACHE_FLUSH_BY_TAG
         def_bool y if MN10300_CACHE_MANAGE_BY_TAG && MN10300_CACHE_WBACK
+
+config MN10300_CACHE_FLUSH_BY_REG
+        def_bool y if MN10300_CACHE_MANAGE_BY_REG && MN10300_CACHE_WBACK