linux/mtd/cfi_endian.h

0001 /* SPDX-License-Identifier: GPL-2.0-or-later */
0002 /*
0003  * Copyright © 2001-2010 David Woodhouse <dwmw2@infradead.org>
0004  */
0005
0006 #include <asm/byteorder.h>
0007
0008 #define CFI_HOST_ENDIAN 1
0009 #define CFI_LITTLE_ENDIAN 2
0010 #define CFI_BIG_ENDIAN 3
0011
0012 #if !defined(CONFIG_MTD_CFI_ADV_OPTIONS) || defined(CONFIG_MTD_CFI_NOSWAP)
0013 #define CFI_DEFAULT_ENDIAN CFI_HOST_ENDIAN
0014 #elif defined(CONFIG_MTD_CFI_LE_BYTE_SWAP)
0015 #define CFI_DEFAULT_ENDIAN CFI_LITTLE_ENDIAN
0016 #elif defined(CONFIG_MTD_CFI_BE_BYTE_SWAP)
0017 #define CFI_DEFAULT_ENDIAN CFI_BIG_ENDIAN
0018 #else
0019 #error No CFI endianness defined
0020 #endif
0021
0022 #define cfi_default(s) ((s)?:CFI_DEFAULT_ENDIAN)
0023 #define cfi_be(s) (cfi_default(s) == CFI_BIG_ENDIAN)
0024 #define cfi_le(s) (cfi_default(s) == CFI_LITTLE_ENDIAN)
0025 #define cfi_host(s) (cfi_default(s) == CFI_HOST_ENDIAN)
0026
0027 #define cpu_to_cfi8(map, x) (x)
0028 #define cfi8_to_cpu(map, x) (x)
0029 #define cpu_to_cfi16(map, x) _cpu_to_cfi(16, (map)->swap, (x))
0030 #define cpu_to_cfi32(map, x) _cpu_to_cfi(32, (map)->swap, (x))
0031 #define cpu_to_cfi64(map, x) _cpu_to_cfi(64, (map)->swap, (x))
0032 #define cfi16_to_cpu(map, x) _cfi_to_cpu(16, (map)->swap, (x))
0033 #define cfi32_to_cpu(map, x) _cfi_to_cpu(32, (map)->swap, (x))
0034 #define cfi64_to_cpu(map, x) _cfi_to_cpu(64, (map)->swap, (x))
0035
0036 #define _cpu_to_cfi(w, s, x) (cfi_host(s)?(x):_swap_to_cfi(w, s, x))
0037 #define _cfi_to_cpu(w, s, x) (cfi_host(s)?(x):_swap_to_cpu(w, s, x))
0038 #define _swap_to_cfi(w, s, x) (cfi_be(s)?cpu_to_be##w(x):cpu_to_le##w(x))
0039 #define _swap_to_cpu(w, s, x) (cfi_be(s)?be##w##_to_cpu(x):le##w##_to_cpu(x))