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MIPS: Add helper function to allow platforms to point at a DTB.

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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>
This commit is contained in:
Ralf Baechle 2012-01-25 15:03:19 +01:00
parent 0a4c531c21
commit 7d6168e576
2 changed files with 22 additions and 0 deletions
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11
arch/mips/include/asm/prom.h
View file

@ -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 */

11
arch/mips/kernel/prom.c
View file

@ -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;
}