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powerpc: add ps3 platform lpar addressing

PATCH In review Geoff Levand 1 participant 1 message Nov 22, 2006

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PowerPC PS3 platform support
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Geoff Levand

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PATCH 10/14 powerpc: add ps3 platform lpar addressing

From: Geoff Levand <[email protected]>

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 Arnd Bergmann <[email protected]>
Signed-off-by Geoff Levand <[email protected]>
---
 arch/powerpc/platforms/ps3/Kconfig |   11 +++++++++++
 include/asm-powerpc/sparsemem.h    |    6 ++++++
 2 files changed, 17 insertions(+)
arch/powerpc/platforms/ps3/Kconfig +11 -0
Index: cell--common--6/arch/powerpc/platforms/ps3/Kconfig
===================================================================
@@ -29,4 +29,15 @@
 	  This support is mainly for Linux kernel development.  If unsure,
 	  say N.
 
+config PS3_USE_LPAR_ADDR
+	depends on 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
include/asm-powerpc/sparsemem.h +6 -0
Index: cell--common--6/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);