linux-imx

/* SPDX-License-Identifier: GPL-2.0 */

​

/* Try to choose an implementation variant via Kconfig */

#ifdef CONFIG_CRC32_SLICEBY8

# define CRC_LE_BITS 64

# define CRC_BE_BITS 64

#endif

#ifdef CONFIG_CRC32_SLICEBY4

# define CRC_LE_BITS 32

# define CRC_BE_BITS 32

#endif

#ifdef CONFIG_CRC32_SARWATE

# define CRC_LE_BITS 8

# define CRC_BE_BITS 8

#endif

#ifdef CONFIG_CRC32_BIT

# define CRC_LE_BITS 1

# define CRC_BE_BITS 1

#endif

​

/*

 * How many bits at a time to use.  Valid values are 1, 2, 4, 8, 32 and 64.

 * For less performance-sensitive, use 4 or 8 to save table size.

 * For larger systems choose same as CPU architecture as default.

 * This works well on X86_64, SPARC64 systems. This may require some

 * elaboration after experiments with other architectures.

 */

#ifndef CRC_LE_BITS

#  ifdef CONFIG_64BIT

#  define CRC_LE_BITS 64

#  else

#  define CRC_LE_BITS 32

#  endif

#endif

#ifndef CRC_BE_BITS

#  ifdef CONFIG_64BIT

#  define CRC_BE_BITS 64

#  else

#  define CRC_BE_BITS 32

#  endif

#endif

​

/*

 * Little-endian CRC computation.  Used with serial bit streams sent

 * lsbit-first.  Be sure to use cpu_to_le32() to append the computed CRC.

 */

#if CRC_LE_BITS > 64 || CRC_LE_BITS < 1 || CRC_LE_BITS == 16 || \

    CRC_LE_BITS & CRC_LE_BITS-1

# error "CRC_LE_BITS must be one of {1, 2, 4, 8, 32, 64}"

#endif

​

/*

 * Big-endian CRC computation.  Used with serial bit streams sent

 * msbit-first.  Be sure to use cpu_to_be32() to append the computed CRC.

 */

#if CRC_BE_BITS > 64 || CRC_BE_BITS < 1 || CRC_BE_BITS == 16 || \

    CRC_BE_BITS & CRC_BE_BITS-1

# error "CRC_BE_BITS must be one of {1, 2, 4, 8, 32, 64}"

#endif