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mtd: cfi: Allow per-mapping CFI device endianness

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This patch allows each CFI device map to use its own endianness. The
globally defined CFI endianness (CONFIG_MTD_CFI_NOSWAP,
CONFIG_MTD_CFI_BE_BYTE_SWAP or CONFIG_MTD_CFI_LE_BYTE_SWAP) becomes the
default value which can be overridden by a driver for a particular device.

Signed-off-by: Aaron Sierra <asierra@xes-inc.com>
Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@linux.intel.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
This commit is contained in:
Aaron Sierra
2011-11-14 18:44:34 -06:00
committed by David Woodhouse
parent 342ff28f5a
commit 8e987465a1
4 changed files with 40 additions and 56 deletions
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74
include/linux/mtd/cfi_endian.h
View File

@ -19,53 +19,35 @@
#include <asm/byteorder.h>
#ifndef CONFIG_MTD_CFI_ADV_OPTIONS
#define CFI_HOST_ENDIAN 1
#define CFI_LITTLE_ENDIAN 2
#define CFI_BIG_ENDIAN 3
#define CFI_HOST_ENDIAN
#else
#ifdef CONFIG_MTD_CFI_NOSWAP
#define CFI_HOST_ENDIAN
#endif
#ifdef CONFIG_MTD_CFI_LE_BYTE_SWAP
#define CFI_LITTLE_ENDIAN
#endif
#ifdef CONFIG_MTD_CFI_BE_BYTE_SWAP
#define CFI_BIG_ENDIAN
#endif
#endif
#if defined(CFI_LITTLE_ENDIAN)
#define cpu_to_cfi8(x) (x)
#define cfi8_to_cpu(x) (x)
#define cpu_to_cfi16(x) cpu_to_le16(x)
#define cpu_to_cfi32(x) cpu_to_le32(x)
#define cpu_to_cfi64(x) cpu_to_le64(x)
#define cfi16_to_cpu(x) le16_to_cpu(x)
#define cfi32_to_cpu(x) le32_to_cpu(x)
#define cfi64_to_cpu(x) le64_to_cpu(x)
#elif defined (CFI_BIG_ENDIAN)
#define cpu_to_cfi8(x) (x)
#define cfi8_to_cpu(x) (x)
#define cpu_to_cfi16(x) cpu_to_be16(x)
#define cpu_to_cfi32(x) cpu_to_be32(x)
#define cpu_to_cfi64(x) cpu_to_be64(x)
#define cfi16_to_cpu(x) be16_to_cpu(x)
#define cfi32_to_cpu(x) be32_to_cpu(x)
#define cfi64_to_cpu(x) be64_to_cpu(x)
#elif defined (CFI_HOST_ENDIAN)
#define cpu_to_cfi8(x) (x)
#define cfi8_to_cpu(x) (x)
#define cpu_to_cfi16(x) (x)
#define cpu_to_cfi32(x) (x)
#define cpu_to_cfi64(x) (x)
#define cfi16_to_cpu(x) (x)
#define cfi32_to_cpu(x) (x)
#define cfi64_to_cpu(x) (x)
#if !defined(CONFIG_MTD_CFI_ADV_OPTIONS) || defined(CONFIG_MTD_CFI_NOSWAP)
#define CFI_DEFAULT_ENDIAN CFI_HOST_ENDIAN
#elif defined(CONFIG_MTD_CFI_LE_BYTE_SWAP)
#define CFI_DEFAULT_ENDIAN CFI_LITTLE_ENDIAN
#elif defined(CONFIG_MTD_CFI_BE_BYTE_SWAP)
#define CFI_DEFAULT_ENDIAN CFI_BIG_ENDIAN
#else
#error No CFI endianness defined
#endif
#define cfi_default(s) ((s)?:CFI_DEFAULT_ENDIAN)
#define cfi_be(s) (cfi_default(s) == CFI_BIG_ENDIAN)
#define cfi_le(s) (cfi_default(s) == CFI_LITTLE_ENDIAN)
#define cfi_host(s) (cfi_default(s) == CFI_HOST_ENDIAN)
#define cpu_to_cfi8(map, x) (x)
#define cfi8_to_cpu(map, x) (x)
#define cpu_to_cfi16(map, x) _cpu_to_cfi(16, (map)->swap, (x))
#define cpu_to_cfi32(map, x) _cpu_to_cfi(32, (map)->swap, (x))
#define cpu_to_cfi64(map, x) _cpu_to_cfi(64, (map)->swap, (x))
#define cfi16_to_cpu(map, x) _cfi_to_cpu(16, (map)->swap, (x))
#define cfi32_to_cpu(map, x) _cfi_to_cpu(32, (map)->swap, (x))
#define cfi64_to_cpu(map, x) _cfi_to_cpu(64, (map)->swap, (x))
#define _cpu_to_cfi(w, s, x) (cfi_host(s)?(x):_swap_to_cfi(w, s, x))
#define _cfi_to_cpu(w, s, x) (cfi_host(s)?(x):_swap_to_cpu(w, s, x))
#define _swap_to_cfi(w, s, x) (cfi_be(s)?cpu_to_be##w(x):cpu_to_le##w(x))
#define _swap_to_cpu(w, s, x) (cfi_be(s)?be##w##_to_cpu(x):le##w##_to_cpu(x))