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powerpc/boot/fdt: Add little-endian support to libfdt wrappers 

For epapr-style boot, we may be little-endian. This change implements
the proper conversion for fdt*_to_cpu and cpu_to_fdt*. We also need the
full cpu_to_* and *_to_cpu macros for this.

Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Jeremy Kerr 2015-02-11 12:55:44 +08:00 committed by Michael Ellerman
parent 1680e4ba3d
commit 6c87b2202f
2 changed files with 16 additions and 6 deletions
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14
arch/powerpc/boot/libfdt_env.h
View File

@ -4,15 +4,17 @@
#include <types.h>
#include <string.h>
#include "of.h"
typedef u32 uint32_t;
typedef u64 uint64_t;
typedef unsigned long uintptr_t;
#define fdt16_to_cpu(x) (x)
#define cpu_to_fdt16(x) (x)
#define fdt32_to_cpu(x) (x)
#define cpu_to_fdt32(x) (x)
#define fdt64_to_cpu(x) (x)
#define cpu_to_fdt64(x) (x)
#define fdt16_to_cpu(x) be16_to_cpu(x)
#define cpu_to_fdt16(x) cpu_to_be16(x)
#define fdt32_to_cpu(x) be32_to_cpu(x)
#define cpu_to_fdt32(x) cpu_to_be32(x)
#define fdt64_to_cpu(x) be64_to_cpu(x)
#define cpu_to_fdt64(x) cpu_to_be64(x)
#endif /* _ARCH_POWERPC_BOOT_LIBFDT_ENV_H */

8
arch/powerpc/boot/of.h
View File

@ -24,11 +24,19 @@ void of_console_init(void);
typedef u32 __be32;
#ifdef __LITTLE_ENDIAN__
#define cpu_to_be16(x) swab16(x)
#define be16_to_cpu(x) swab16(x)
#define cpu_to_be32(x) swab32(x)
#define be32_to_cpu(x) swab32(x)
#define cpu_to_be64(x) swab64(x)
#define be64_to_cpu(x) swab64(x)
#else
#define cpu_to_be16(x) (x)
#define be16_to_cpu(x) (x)
#define cpu_to_be32(x) (x)
#define be32_to_cpu(x) (x)
#define cpu_to_be64(x) (x)
#define be64_to_cpu(x) (x)
#endif
#define PROM_ERROR (-1u)