[POWERPC] ps3: add lpar addressing

Adds some needed bits for a config option PS3_USE_LPAR_ADDR that disables
the PS3 lpar address translation mechanism.  This is a currently needed
workaround for limitations in the design of the generic cell spu support.

Signed-off-by: Geoff Levand <geoffrey.levand@am.sony.com>
Signed-off-by: Arnd Bergmann <arnd.bergmann@de.ibm.com>

2 files changed, 17 insertions, 0 deletions

diff --git a/arch/powerpc/platforms/ps3/Kconfig b/arch/powerpc/platforms/ps3/Kconfig
index f023719f6459..451bfcd5502e 100644
--- a/arch/powerpc/platforms/ps3/Kconfig
+++ b/arch/powerpc/platforms/ps3/Kconfig
@@ -29,4 +29,15 @@ config PS3_DYNAMIC_DMA
           This support is mainly for Linux kernel development.  If unsure,
           say N.
 
+config PS3_USE_LPAR_ADDR
+        depends on PPC_PS3 && EXPERIMENTAL
+        bool "PS3 use lpar address space"
+        default y
+        help
+          This option is solely for experimentation by experts.  Disables
+          translation of lpar addresses.  SPE support currently won't work
+          without this set to y.
+
+          If you have any doubt, choose the default y.
+
 endmenu
diff --git a/include/asm-powerpc/sparsemem.h b/include/asm-powerpc/sparsemem.h
index 38b1ea3b58fd..48ad807a0b8a 100644
--- a/include/asm-powerpc/sparsemem.h
+++ b/include/asm-powerpc/sparsemem.h
@@ -9,8 +9,14 @@
  * MAX_PHYSMEM_BITS             2^N: how much memory we can have in that space
  */
 #define SECTION_SIZE_BITS       24
+
+#if defined(CONFIG_PS3_USE_LPAR_ADDR)
+#define MAX_PHYSADDR_BITS       47
+#define MAX_PHYSMEM_BITS        47
+#else
 #define MAX_PHYSADDR_BITS       44
 #define MAX_PHYSMEM_BITS        44
+#endif
 
 #ifdef CONFIG_MEMORY_HOTPLUG
 extern void create_section_mapping(unsigned long start, unsigned long end);