summaryrefslogtreecommitdiffstats
path: root/arch/mips
diff options
context:
space:
mode:
authorRalf Baechle <ralf@linux-mips.org>2012-01-25 15:03:19 +0100
committerRalf Baechle <ralf@linux-mips.org>2012-05-15 17:49:19 +0200
commit7d6168e57610a51404fb30e500345e2d92c20b18 (patch)
treef3848ea8c3b177217f778498500a8abce9299389 /arch/mips
parent0a4c531c2124cbb700484787327c516abbd76e70 (diff)
MIPS: Add helper function to allow platforms to point at a DTB.
Add __dt_setup_arch() that can be called to load a builtin DT. Additionally we add a macro to allow loading a specific symbol from the __dtb_* section. Signed-off-by: John Crispin <blogic@openwrt.org> Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/3715/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch/mips')
-rw-r--r--arch/mips/include/asm/prom.h11
-rw-r--r--arch/mips/kernel/prom.c11
2 files changed, 22 insertions, 0 deletions
diff --git a/arch/mips/include/asm/prom.h b/arch/mips/include/asm/prom.h
index 40ed25952e6..7206d445bab 100644
--- a/arch/mips/include/asm/prom.h
+++ b/arch/mips/include/asm/prom.h
@@ -36,6 +36,17 @@ static inline unsigned long pci_address_to_pio(phys_addr_t address)
}
#define pci_address_to_pio pci_address_to_pio
+struct boot_param_header;
+
+extern void __dt_setup_arch(struct boot_param_header *bph);
+
+#define dt_setup_arch(sym) \
+({ \
+ extern struct boot_param_header __dtb_##sym##_begin; \
+ \
+ __dt_setup_arch(&__dtb_##sym##_begin); \
+})
+
#else /* CONFIG_OF */
static inline void device_tree_init(void) { }
#endif /* CONFIG_OF */
diff --git a/arch/mips/kernel/prom.c b/arch/mips/kernel/prom.c
index 558b5395795..4c788d25953 100644
--- a/arch/mips/kernel/prom.c
+++ b/arch/mips/kernel/prom.c
@@ -95,3 +95,14 @@ void __init device_tree_init(void)
/* free the space reserved for the dt blob */
free_mem_mach(base, size);
}
+
+void __init __dt_setup_arch(struct boot_param_header *bph)
+{
+ if (be32_to_cpu(bph->magic) != OF_DT_HEADER) {
+ pr_err("DTB has bad magic, ignoring builtin OF DTB\n");
+
+ return;
+ }
+
+ initial_boot_params = bph;
+}