162306a36Sopenharmony_ci/* SPDX-License-Identifier: GPL-2.0 */ 262306a36Sopenharmony_ci 362306a36Sopenharmony_ci/* Try to choose an implementation variant via Kconfig */ 462306a36Sopenharmony_ci#ifdef CONFIG_CRC32_SLICEBY8 562306a36Sopenharmony_ci# define CRC_LE_BITS 64 662306a36Sopenharmony_ci# define CRC_BE_BITS 64 762306a36Sopenharmony_ci#endif 862306a36Sopenharmony_ci#ifdef CONFIG_CRC32_SLICEBY4 962306a36Sopenharmony_ci# define CRC_LE_BITS 32 1062306a36Sopenharmony_ci# define CRC_BE_BITS 32 1162306a36Sopenharmony_ci#endif 1262306a36Sopenharmony_ci#ifdef CONFIG_CRC32_SARWATE 1362306a36Sopenharmony_ci# define CRC_LE_BITS 8 1462306a36Sopenharmony_ci# define CRC_BE_BITS 8 1562306a36Sopenharmony_ci#endif 1662306a36Sopenharmony_ci#ifdef CONFIG_CRC32_BIT 1762306a36Sopenharmony_ci# define CRC_LE_BITS 1 1862306a36Sopenharmony_ci# define CRC_BE_BITS 1 1962306a36Sopenharmony_ci#endif 2062306a36Sopenharmony_ci 2162306a36Sopenharmony_ci/* 2262306a36Sopenharmony_ci * How many bits at a time to use. Valid values are 1, 2, 4, 8, 32 and 64. 2362306a36Sopenharmony_ci * For less performance-sensitive, use 4 or 8 to save table size. 2462306a36Sopenharmony_ci * For larger systems choose same as CPU architecture as default. 2562306a36Sopenharmony_ci * This works well on X86_64, SPARC64 systems. This may require some 2662306a36Sopenharmony_ci * elaboration after experiments with other architectures. 2762306a36Sopenharmony_ci */ 2862306a36Sopenharmony_ci#ifndef CRC_LE_BITS 2962306a36Sopenharmony_ci# ifdef CONFIG_64BIT 3062306a36Sopenharmony_ci# define CRC_LE_BITS 64 3162306a36Sopenharmony_ci# else 3262306a36Sopenharmony_ci# define CRC_LE_BITS 32 3362306a36Sopenharmony_ci# endif 3462306a36Sopenharmony_ci#endif 3562306a36Sopenharmony_ci#ifndef CRC_BE_BITS 3662306a36Sopenharmony_ci# ifdef CONFIG_64BIT 3762306a36Sopenharmony_ci# define CRC_BE_BITS 64 3862306a36Sopenharmony_ci# else 3962306a36Sopenharmony_ci# define CRC_BE_BITS 32 4062306a36Sopenharmony_ci# endif 4162306a36Sopenharmony_ci#endif 4262306a36Sopenharmony_ci 4362306a36Sopenharmony_ci/* 4462306a36Sopenharmony_ci * Little-endian CRC computation. Used with serial bit streams sent 4562306a36Sopenharmony_ci * lsbit-first. Be sure to use cpu_to_le32() to append the computed CRC. 4662306a36Sopenharmony_ci */ 4762306a36Sopenharmony_ci#if CRC_LE_BITS > 64 || CRC_LE_BITS < 1 || CRC_LE_BITS == 16 || \ 4862306a36Sopenharmony_ci CRC_LE_BITS & CRC_LE_BITS-1 4962306a36Sopenharmony_ci# error "CRC_LE_BITS must be one of {1, 2, 4, 8, 32, 64}" 5062306a36Sopenharmony_ci#endif 5162306a36Sopenharmony_ci 5262306a36Sopenharmony_ci/* 5362306a36Sopenharmony_ci * Big-endian CRC computation. Used with serial bit streams sent 5462306a36Sopenharmony_ci * msbit-first. Be sure to use cpu_to_be32() to append the computed CRC. 5562306a36Sopenharmony_ci */ 5662306a36Sopenharmony_ci#if CRC_BE_BITS > 64 || CRC_BE_BITS < 1 || CRC_BE_BITS == 16 || \ 5762306a36Sopenharmony_ci CRC_BE_BITS & CRC_BE_BITS-1 5862306a36Sopenharmony_ci# error "CRC_BE_BITS must be one of {1, 2, 4, 8, 32, 64}" 5962306a36Sopenharmony_ci#endif 60