sh: Support explicit L1 cache disabling.
This reworks the cache mode configuration in Kconfig, and allows for
explicit selection of write-back/write-through/off configurations.
All of the cache flushing routines are optimized away for the off
case.
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
diff --git a/arch/sh/mm/Kconfig b/arch/sh/mm/Kconfig
index 093d491..c277755 100644
--- a/arch/sh/mm/Kconfig
+++ b/arch/sh/mm/Kconfig
@@ -2,7 +2,6 @@
# Processor families
#
config CPU_SH2
- select SH_WRITETHROUGH if !CPU_SH2A
bool
config CPU_SH2A
@@ -414,8 +413,17 @@
Turn this option off for platforms that do not have a direct-mapped
cache, and you have no need to run the caches in such a configuration.
-config SH_WRITETHROUGH
- bool "Use write-through caching"
+choice
+ prompt "Cache mode"
+ default CACHE_WRITEBACK if CPU_SH2A || CPU_SH3 || CPU_SH4
+ default CACHE_WRITETHROUGH if (CPU_SH2 && !CPU_SH2A)
+
+config CACHE_WRITEBACK
+ bool "Write-back"
+ depends on CPU_SH2A || CPU_SH3 || CPU_SH4
+
+config CACHE_WRITETHROUGH
+ bool "Write-through"
help
Selecting this option will configure the caches in write-through
mode, as opposed to the default write-back configuration.
@@ -426,4 +434,9 @@
If unsure, say N.
+config CACHE_OFF
+ bool "Off"
+
+endchoice
+
endmenu