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cfi_endian.h
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1 /*
2  * Copyright © 2001-2010 David Woodhouse <[email protected]>
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))