--- /dev/null
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * crc32-mips.c - CRC32 and CRC32C using optional MIPSr6 instructions
+ *
+ * Module based on arm64/crypto/crc32-arm.c
+ *
+ * Copyright (C) 2014 Linaro Ltd <yazen.ghannam@linaro.org>
+ * Copyright (C) 2018 MIPS Tech, LLC
+ */
+
+#include <linux/unaligned/access_ok.h>
+#include <linux/cpufeature.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/string.h>
+#include <asm/mipsregs.h>
+
+#include <crypto/internal/hash.h>
+
+enum crc_op_size {
+ b, h, w, d,
+};
+
+enum crc_type {
+ crc32,
+ crc32c,
+};
+
+#ifndef TOOLCHAIN_SUPPORTS_CRC
+#define _ASM_MACRO_CRC32(OP, SZ, TYPE) \
+_ASM_MACRO_3R(OP, rt, rs, rt2, \
+ ".ifnc \\rt, \\rt2\n\t" \
+ ".error \"invalid operands \\\"" #OP " \\rt,\\rs,\\rt2\\\"\"\n\t" \
+ ".endif\n\t" \
+ _ASM_INSN_IF_MIPS(0x7c00000f | (__rt << 16) | (__rs << 21) | \
+ ((SZ) << 6) | ((TYPE) << 8)) \
+ _ASM_INSN32_IF_MM(0x00000030 | (__rs << 16) | (__rt << 21) | \
+ ((SZ) << 14) | ((TYPE) << 3)))
+_ASM_MACRO_CRC32(crc32b, 0, 0);
+_ASM_MACRO_CRC32(crc32h, 1, 0);
+_ASM_MACRO_CRC32(crc32w, 2, 0);
+_ASM_MACRO_CRC32(crc32d, 3, 0);
+_ASM_MACRO_CRC32(crc32cb, 0, 1);
+_ASM_MACRO_CRC32(crc32ch, 1, 1);
+_ASM_MACRO_CRC32(crc32cw, 2, 1);
+_ASM_MACRO_CRC32(crc32cd, 3, 1);
+#define _ASM_SET_CRC ""
+#else /* !TOOLCHAIN_SUPPORTS_CRC */
+#define _ASM_SET_CRC ".set\tcrc\n\t"
+#endif
+
+#define _CRC32(crc, value, size, type) \
+do { \
+ __asm__ __volatile__( \
+ ".set push\n\t" \
+ _ASM_SET_CRC \
+ #type #size " %0, %1, %0\n\t" \
+ ".set pop" \
+ : "+r" (crc) \
+ : "r" (value)); \
+} while (0)
+
+#define CRC32(crc, value, size) \
+ _CRC32(crc, value, size, crc32)
+
+#define CRC32C(crc, value, size) \
+ _CRC32(crc, value, size, crc32c)
+
+static u32 crc32_mips_le_hw(u32 crc_, const u8 *p, unsigned int len)
+{
+ u32 crc = crc_;
+
+#ifdef CONFIG_64BIT
+ while (len >= sizeof(u64)) {
+ u64 value = get_unaligned_le64(p);
+
+ CRC32(crc, value, d);
+ p += sizeof(u64);
+ len -= sizeof(u64);
+ }
+
+ if (len & sizeof(u32)) {
+#else /* !CONFIG_64BIT */
+ while (len >= sizeof(u32)) {
+#endif
+ u32 value = get_unaligned_le32(p);
+
+ CRC32(crc, value, w);
+ p += sizeof(u32);
+ len -= sizeof(u32);
+ }
+
+ if (len & sizeof(u16)) {
+ u16 value = get_unaligned_le16(p);
+
+ CRC32(crc, value, h);
+ p += sizeof(u16);
+ }
+
+ if (len & sizeof(u8)) {
+ u8 value = *p++;
+
+ CRC32(crc, value, b);
+ }
+
+ return crc;
+}
+
+static u32 crc32c_mips_le_hw(u32 crc_, const u8 *p, unsigned int len)
+{
+ u32 crc = crc_;
+
+#ifdef CONFIG_64BIT
+ while (len >= sizeof(u64)) {
+ u64 value = get_unaligned_le64(p);
+
+ CRC32C(crc, value, d);
+ p += sizeof(u64);
+ len -= sizeof(u64);
+ }
+
+ if (len & sizeof(u32)) {
+#else /* !CONFIG_64BIT */
+ while (len >= sizeof(u32)) {
+#endif
+ u32 value = get_unaligned_le32(p);
+
+ CRC32C(crc, value, w);
+ p += sizeof(u32);
+ len -= sizeof(u32);
+ }
+
+ if (len & sizeof(u16)) {
+ u16 value = get_unaligned_le16(p);
+
+ CRC32C(crc, value, h);
+ p += sizeof(u16);
+ }
+
+ if (len & sizeof(u8)) {
+ u8 value = *p++;
+
+ CRC32C(crc, value, b);
+ }
+ return crc;
+}
+
+#define CHKSUM_BLOCK_SIZE 1
+#define CHKSUM_DIGEST_SIZE 4
+
+struct chksum_ctx {
+ u32 key;
+};
+
+struct chksum_desc_ctx {
+ u32 crc;
+};
+
+static int chksum_init(struct shash_desc *desc)
+{
+ struct chksum_ctx *mctx = crypto_shash_ctx(desc->tfm);
+ struct chksum_desc_ctx *ctx = shash_desc_ctx(desc);
+
+ ctx->crc = mctx->key;
+
+ return 0;
+}
+
+/*
+ * Setting the seed allows arbitrary accumulators and flexible XOR policy
+ * If your algorithm starts with ~0, then XOR with ~0 before you set
+ * the seed.
+ */
+static int chksum_setkey(struct crypto_shash *tfm, const u8 *key,
+ unsigned int keylen)
+{
+ struct chksum_ctx *mctx = crypto_shash_ctx(tfm);
+
+ if (keylen != sizeof(mctx->key)) {
+ crypto_shash_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
+ return -EINVAL;
+ }
+ mctx->key = get_unaligned_le32(key);
+ return 0;
+}
+
+static int chksum_update(struct shash_desc *desc, const u8 *data,
+ unsigned int length)
+{
+ struct chksum_desc_ctx *ctx = shash_desc_ctx(desc);
+
+ ctx->crc = crc32_mips_le_hw(ctx->crc, data, length);
+ return 0;
+}
+
+static int chksumc_update(struct shash_desc *desc, const u8 *data,
+ unsigned int length)
+{
+ struct chksum_desc_ctx *ctx = shash_desc_ctx(desc);
+
+ ctx->crc = crc32c_mips_le_hw(ctx->crc, data, length);
+ return 0;
+}
+
+static int chksum_final(struct shash_desc *desc, u8 *out)
+{
+ struct chksum_desc_ctx *ctx = shash_desc_ctx(desc);
+
+ put_unaligned_le32(ctx->crc, out);
+ return 0;
+}
+
+static int chksumc_final(struct shash_desc *desc, u8 *out)
+{
+ struct chksum_desc_ctx *ctx = shash_desc_ctx(desc);
+
+ put_unaligned_le32(~ctx->crc, out);
+ return 0;
+}
+
+static int __chksum_finup(u32 crc, const u8 *data, unsigned int len, u8 *out)
+{
+ put_unaligned_le32(crc32_mips_le_hw(crc, data, len), out);
+ return 0;
+}
+
+static int __chksumc_finup(u32 crc, const u8 *data, unsigned int len, u8 *out)
+{
+ put_unaligned_le32(~crc32c_mips_le_hw(crc, data, len), out);
+ return 0;
+}
+
+static int chksum_finup(struct shash_desc *desc, const u8 *data,
+ unsigned int len, u8 *out)
+{
+ struct chksum_desc_ctx *ctx = shash_desc_ctx(desc);
+
+ return __chksum_finup(ctx->crc, data, len, out);
+}
+
+static int chksumc_finup(struct shash_desc *desc, const u8 *data,
+ unsigned int len, u8 *out)
+{
+ struct chksum_desc_ctx *ctx = shash_desc_ctx(desc);
+
+ return __chksumc_finup(ctx->crc, data, len, out);
+}
+
+static int chksum_digest(struct shash_desc *desc, const u8 *data,
+ unsigned int length, u8 *out)
+{
+ struct chksum_ctx *mctx = crypto_shash_ctx(desc->tfm);
+
+ return __chksum_finup(mctx->key, data, length, out);
+}
+
+static int chksumc_digest(struct shash_desc *desc, const u8 *data,
+ unsigned int length, u8 *out)
+{
+ struct chksum_ctx *mctx = crypto_shash_ctx(desc->tfm);
+
+ return __chksumc_finup(mctx->key, data, length, out);
+}
+
+static int chksum_cra_init(struct crypto_tfm *tfm)
+{
+ struct chksum_ctx *mctx = crypto_tfm_ctx(tfm);
+
+ mctx->key = ~0;
+ return 0;
+}
+
+static struct shash_alg crc32_alg = {
+ .digestsize = CHKSUM_DIGEST_SIZE,
+ .setkey = chksum_setkey,
+ .init = chksum_init,
+ .update = chksum_update,
+ .final = chksum_final,
+ .finup = chksum_finup,
+ .digest = chksum_digest,
+ .descsize = sizeof(struct chksum_desc_ctx),
+ .base = {
+ .cra_name = "crc32",
+ .cra_driver_name = "crc32-mips-hw",
+ .cra_priority = 300,
+ .cra_flags = CRYPTO_ALG_OPTIONAL_KEY,
+ .cra_blocksize = CHKSUM_BLOCK_SIZE,
+ .cra_alignmask = 0,
+ .cra_ctxsize = sizeof(struct chksum_ctx),
+ .cra_module = THIS_MODULE,
+ .cra_init = chksum_cra_init,
+ }
+};
+
+static struct shash_alg crc32c_alg = {
+ .digestsize = CHKSUM_DIGEST_SIZE,
+ .setkey = chksum_setkey,
+ .init = chksum_init,
+ .update = chksumc_update,
+ .final = chksumc_final,
+ .finup = chksumc_finup,
+ .digest = chksumc_digest,
+ .descsize = sizeof(struct chksum_desc_ctx),
+ .base = {
+ .cra_name = "crc32c",
+ .cra_driver_name = "crc32c-mips-hw",
+ .cra_priority = 300,
+ .cra_flags = CRYPTO_ALG_OPTIONAL_KEY,
+ .cra_blocksize = CHKSUM_BLOCK_SIZE,
+ .cra_alignmask = 0,
+ .cra_ctxsize = sizeof(struct chksum_ctx),
+ .cra_module = THIS_MODULE,
+ .cra_init = chksum_cra_init,
+ }
+};
+
+static int __init crc32_mod_init(void)
+{
+ int err;
+
+ err = crypto_register_shash(&crc32_alg);
+
+ if (err)
+ return err;
+
+ err = crypto_register_shash(&crc32c_alg);
+
+ if (err) {
+ crypto_unregister_shash(&crc32_alg);
+ return err;
+ }
+
+ return 0;
+}
+
+static void __exit crc32_mod_exit(void)
+{
+ crypto_unregister_shash(&crc32_alg);
+ crypto_unregister_shash(&crc32c_alg);
+}
+
+MODULE_AUTHOR("Marcin Nowakowski <marcin.nowakowski@mips.com");
+MODULE_DESCRIPTION("CRC32 and CRC32C using optional MIPS instructions");
+MODULE_LICENSE("GPL v2");
+
+module_cpu_feature_match(MIPS_CRC32, crc32_mod_init);
+module_exit(crc32_mod_exit);
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