x86, olpc: Add OLPC device-tree support
Make use of PROC_DEVICETREE to export the tree, and sparc's PROMTREE code to
call into OLPC's Open Firmware to build the tree.
v5: fix buglet with root node check (introduced in v4)
v4: address some minor style issues pointed out by Grant, and explicitly cast
negative phandle checks to s32.
v3: rename olpc_prom to olpc_dt
- rework Kconfig entries
- drop devtree build hook from proc, instead adding a call to x86's
paging_init (similarly to how sparc64 does it)
- switch allocation from using slab to alloc_bootmem. this allows
the DT to be built earlier during boot (during setup_arch); the
downside is that there are some 1200 bootmem reservations that are
done during boot. Not ideal..
- add a helper olpc_ofw_is_installed function to test for the
existence and successful detection of OLPC's OFW.
Signed-off-by: Andres Salomon <dilinger@queued.net>
LKML-Reference: <20101116220952.26526a80@queued.net>
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index e330da2..ef34031 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -2049,11 +2049,17 @@
bool "Support for OLPC's Open Firmware"
depends on !X86_64 && !X86_PAE
default n
+ select OF
help
This option adds support for the implementation of Open Firmware
that is used on the OLPC XO-1 Children's Machine.
If unsure, say N here.
+config OLPC_OPENFIRMWARE_DT
+ bool
+ default y if OLPC_OPENFIRMWARE && PROC_DEVICETREE
+ select OF_PROMTREE
+
endif # X86_32
config AMD_NB