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TOMOYO Linux Cross Reference
Linux/include/linux/mtd/cfi_endian.h

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  1 /*
  2  * Copyright © 2001-2010 David Woodhouse <dwmw2@infradead.org>
  3  *
  4  * This program is free software; you can redistribute it and/or modify
  5  * it under the terms of the GNU General Public License as published by
  6  * the Free Software Foundation; either version 2 of the License, or
  7  * (at your option) any later version.
  8  *
  9  * This program is distributed in the hope that it will be useful,
 10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 12  * GNU General Public License for more details.
 13  *
 14  * You should have received a copy of the GNU General Public License
 15  * along with this program; if not, write to the Free Software
 16  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 17  *
 18  */
 19 
 20 #include <asm/byteorder.h>
 21 
 22 #define CFI_HOST_ENDIAN 1
 23 #define CFI_LITTLE_ENDIAN 2
 24 #define CFI_BIG_ENDIAN 3
 25 
 26 #if !defined(CONFIG_MTD_CFI_ADV_OPTIONS) || defined(CONFIG_MTD_CFI_NOSWAP)
 27 #define CFI_DEFAULT_ENDIAN CFI_HOST_ENDIAN
 28 #elif defined(CONFIG_MTD_CFI_LE_BYTE_SWAP)
 29 #define CFI_DEFAULT_ENDIAN CFI_LITTLE_ENDIAN
 30 #elif defined(CONFIG_MTD_CFI_BE_BYTE_SWAP)
 31 #define CFI_DEFAULT_ENDIAN CFI_BIG_ENDIAN
 32 #else
 33 #error No CFI endianness defined
 34 #endif
 35 
 36 #define cfi_default(s) ((s)?:CFI_DEFAULT_ENDIAN)
 37 #define cfi_be(s) (cfi_default(s) == CFI_BIG_ENDIAN)
 38 #define cfi_le(s) (cfi_default(s) == CFI_LITTLE_ENDIAN)
 39 #define cfi_host(s) (cfi_default(s) == CFI_HOST_ENDIAN)
 40 
 41 #define cpu_to_cfi8(map, x) (x)
 42 #define cfi8_to_cpu(map, x) (x)
 43 #define cpu_to_cfi16(map, x) _cpu_to_cfi(16, (map)->swap, (x))
 44 #define cpu_to_cfi32(map, x) _cpu_to_cfi(32, (map)->swap, (x))
 45 #define cpu_to_cfi64(map, x) _cpu_to_cfi(64, (map)->swap, (x))
 46 #define cfi16_to_cpu(map, x) _cfi_to_cpu(16, (map)->swap, (x))
 47 #define cfi32_to_cpu(map, x) _cfi_to_cpu(32, (map)->swap, (x))
 48 #define cfi64_to_cpu(map, x) _cfi_to_cpu(64, (map)->swap, (x))
 49 
 50 #define _cpu_to_cfi(w, s, x) (cfi_host(s)?(x):_swap_to_cfi(w, s, x))
 51 #define _cfi_to_cpu(w, s, x) (cfi_host(s)?(x):_swap_to_cpu(w, s, x))
 52 #define _swap_to_cfi(w, s, x) (cfi_be(s)?cpu_to_be##w(x):cpu_to_le##w(x))
 53 #define _swap_to_cpu(w, s, x) (cfi_be(s)?be##w##_to_cpu(x):le##w##_to_cpu(x))
 54 

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