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Commit 7d6168e5 authored by Ralf Baechle's avatar Ralf Baechle
Browse files

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: default avatarJohn Crispin <blogic@openwrt.org>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/3715/


Signed-off-by: default avatarRalf Baechle <ralf@linux-mips.org>
parent 0a4c531c

arch/mips/include/asm/prom.h

+11 −0
Original line number Diff line number Diff line
@@ -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 */

arch/mips/kernel/prom.c

+11 −0
Original line number Diff line number Diff line
@@ -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;

}