[PATCH] powerpc: Add OF address parsing code (#2)

Parsing addresses extracted from Open Firmware isn't a simple matter. We
have various bits of code that try to do it in various place, including
some heuristics in prom.c that pre-parse addresses at boot and fill
device-nodes "addrs", but those are dodgy at best and I want to
deprecate them. So this patch introduces a new set of routines that
should be capable of parsing most types of addresses and translating
them into CPU physical addresses. It currently works for things on PCI
busses and ISA busses and should work on "standard" busses like the root
bus or the MacIO bus that don't put funky flags in addresses. If you
have other bus types that do use funky flags, you'll have to add new bus
type translators, which is fairly easy.

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

1 files changed, 10 insertions, 0 deletions

diff --git a/include/asm-ppc/prom.h b/include/asm-ppc/prom.h
index 3e39827ed566..a10a2d64b300 100644
--- a/include/asm-ppc/prom.h
+++ b/include/asm-ppc/prom.h
@@ -136,5 +136,15 @@ extern unsigned long sub_reloc_offset(unsigned long);
 #define PTRRELOC(x)     ((typeof(x))add_reloc_offset((unsigned long)(x)))
 #define PTRUNRELOC(x)   ((typeof(x))sub_reloc_offset((unsigned long)(x)))
 
+
+/*
+ * Address translation function(s)
+ */
+#define OF_BAD_ADDR     ((u64)-1)
+extern u64 of_translate_address(struct device_node *np, u32 *addr);
+extern u32 *of_get_address(struct device_node *dev, int index, u64 *size);
+extern u32 *of_get_pci_address(struct device_node *dev, int bar_no, u64 *size);
+
+
 #endif /* _PPC_PROM_H */
 #endif /* __KERNEL__ */