include/linux/mtd/cfi_endian.h

   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))