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/include/asm/olpc_ofw.h b/arch/x86/include/asm/olpc_ofw.h
index 2a84781..641988e 100644
--- a/arch/x86/include/asm/olpc_ofw.h
+++ b/arch/x86/include/asm/olpc_ofw.h
@@ -8,6 +8,8 @@
#ifdef CONFIG_OLPC_OPENFIRMWARE
+extern bool olpc_ofw_is_installed(void);
+
/* run an OFW command by calling into the firmware */
#define olpc_ofw(name, args, res) \
__olpc_ofw((name), ARRAY_SIZE(args), args, ARRAY_SIZE(res), res)
@@ -26,10 +28,17 @@
#else /* !CONFIG_OLPC_OPENFIRMWARE */
+static inline bool olpc_ofw_is_installed(void) { return false; }
static inline void olpc_ofw_detect(void) { }
static inline void setup_olpc_ofw_pgd(void) { }
static inline bool olpc_ofw_present(void) { return false; }
#endif /* !CONFIG_OLPC_OPENFIRMWARE */
+#ifdef CONFIG_OLPC_OPENFIRMWARE_DT
+extern void olpc_dt_build_devicetree(void);
+#else
+static inline void olpc_dt_build_devicetree(void) { }
+#endif /* CONFIG_OLPC_OPENFIRMWARE_DT */
+
#endif /* _ASM_X86_OLPC_OFW_H */
