[POWERPC] Generic DCR infrastructure

This patch adds new dcr_map/dcr_read/dcr_write accessors for DCRs that
can be used by drivers to transparently address either native DCRs or
memory mapped DCRs. The implementation for memory mapped DCRs is done
after the binding being currently worked on for SLOF and the Axon
chipset. This patch enables it for the cell native platform

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>

1 files changed, 16 insertions, 0 deletions

diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index 96316c866107..0e564d30fc46 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -160,9 +160,11 @@ config PPC_86xx
 
 config 40x
         bool "AMCC 40x"
+        select PPC_DCR_NATIVE
 
 config 44x
         bool "AMCC 44x"
+        select PPC_DCR_NATIVE
 
 config 8xx
         bool "Freescale 8xx"
@@ -208,6 +210,19 @@ config PPC_FPU
         bool
         default y if PPC64
 
+config PPC_DCR_NATIVE
+        bool
+        default n
+
+config PPC_DCR_MMIO
+        bool
+        default n
+
+config PPC_DCR
+        bool
+        depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
+        default y
+
 config BOOKE
         bool
         depends on E200 || E500
@@ -453,6 +468,7 @@ config PPC_CELL
 config PPC_CELL_NATIVE
         bool
         select PPC_CELL
+        select PPC_DCR_MMIO
         default n
 
 config PPC_IBM_CELL_BLADE