sparc64: Add CRC32C driver making use of the new crc32c opcode.
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/arch/sparc/crypto/crc32c_glue.c b/arch/sparc/crypto/crc32c_glue.c
new file mode 100644
index 0000000..ec31cdb
--- /dev/null
+++ b/arch/sparc/crypto/crc32c_glue.c
@@ -0,0 +1,177 @@
+/* Glue code for CRC32C optimized for sparc64 crypto opcodes.
+ *
+ * This is based largely upon arch/x86/crypto/crc32c-intel.c
+ *
+ * Copyright (C) 2008 Intel Corporation
+ * Authors: Austin Zhang <austin_zhang@linux.intel.com>
+ * Kent Liu <kent.liu@intel.com>
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/string.h>
+#include <linux/kernel.h>
+#include <linux/crc32.h>
+
+#include <crypto/internal/hash.h>
+
+#include <asm/pstate.h>
+#include <asm/elf.h>
+
+/*
+ * 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 crc32c_sparc64_setkey(struct crypto_shash *hash, const u8 *key,
+ unsigned int keylen)
+{
+ u32 *mctx = crypto_shash_ctx(hash);
+
+ if (keylen != sizeof(u32)) {
+ crypto_shash_set_flags(hash, CRYPTO_TFM_RES_BAD_KEY_LEN);
+ return -EINVAL;
+ }
+ *(__le32 *)mctx = le32_to_cpup((__le32 *)key);
+ return 0;
+}
+
+static int crc32c_sparc64_init(struct shash_desc *desc)
+{
+ u32 *mctx = crypto_shash_ctx(desc->tfm);
+ u32 *crcp = shash_desc_ctx(desc);
+
+ *crcp = *mctx;
+
+ return 0;
+}
+
+extern void crc32c_sparc64(u32 *crcp, const u64 *data, unsigned int len);
+
+static void crc32c_compute(u32 *crcp, const u64 *data, unsigned int len)
+{
+ unsigned int asm_len;
+
+ asm_len = len & ~7U;
+ if (asm_len) {
+ crc32c_sparc64(crcp, data, asm_len);
+ data += asm_len / 8;
+ len -= asm_len;
+ }
+ if (len)
+ *crcp = __crc32c_le(*crcp, (const unsigned char *) data, len);
+}
+
+static int crc32c_sparc64_update(struct shash_desc *desc, const u8 *data,
+ unsigned int len)
+{
+ u32 *crcp = shash_desc_ctx(desc);
+
+ crc32c_compute(crcp, (const u64 *) data, len);
+
+ return 0;
+}
+
+static int __crc32c_sparc64_finup(u32 *crcp, const u8 *data, unsigned int len,
+ u8 *out)
+{
+ u32 tmp = *crcp;
+
+ crc32c_compute(&tmp, (const u64 *) data, len);
+
+ *(__le32 *) out = ~cpu_to_le32(tmp);
+ return 0;
+}
+
+static int crc32c_sparc64_finup(struct shash_desc *desc, const u8 *data,
+ unsigned int len, u8 *out)
+{
+ return __crc32c_sparc64_finup(shash_desc_ctx(desc), data, len, out);
+}
+
+static int crc32c_sparc64_final(struct shash_desc *desc, u8 *out)
+{
+ u32 *crcp = shash_desc_ctx(desc);
+
+ *(__le32 *) out = ~cpu_to_le32p(crcp);
+ return 0;
+}
+
+static int crc32c_sparc64_digest(struct shash_desc *desc, const u8 *data,
+ unsigned int len, u8 *out)
+{
+ return __crc32c_sparc64_finup(crypto_shash_ctx(desc->tfm), data, len,
+ out);
+}
+
+static int crc32c_sparc64_cra_init(struct crypto_tfm *tfm)
+{
+ u32 *key = crypto_tfm_ctx(tfm);
+
+ *key = ~0;
+
+ return 0;
+}
+
+#define CHKSUM_BLOCK_SIZE 1
+#define CHKSUM_DIGEST_SIZE 4
+
+static struct shash_alg alg = {
+ .setkey = crc32c_sparc64_setkey,
+ .init = crc32c_sparc64_init,
+ .update = crc32c_sparc64_update,
+ .final = crc32c_sparc64_final,
+ .finup = crc32c_sparc64_finup,
+ .digest = crc32c_sparc64_digest,
+ .descsize = sizeof(u32),
+ .digestsize = CHKSUM_DIGEST_SIZE,
+ .base = {
+ .cra_name = "crc32c",
+ .cra_driver_name = "crc32c-sparc64",
+ .cra_priority = 150,
+ .cra_blocksize = CHKSUM_BLOCK_SIZE,
+ .cra_ctxsize = sizeof(u32),
+ .cra_alignmask = 7,
+ .cra_module = THIS_MODULE,
+ .cra_init = crc32c_sparc64_cra_init,
+ }
+};
+
+static bool __init sparc64_has_crc32c_opcode(void)
+{
+ unsigned long cfr;
+
+ if (!(sparc64_elf_hwcap & HWCAP_SPARC_CRYPTO))
+ return false;
+
+ __asm__ __volatile__("rd %%asr26, %0" : "=r" (cfr));
+ if (!(cfr & CFR_CRC32C))
+ return false;
+
+ return true;
+}
+
+static int __init crc32c_sparc64_mod_init(void)
+{
+ if (sparc64_has_crc32c_opcode()) {
+ pr_info("Using sparc64 crc32c opcode optimized CRC32C implementation\n");
+ return crypto_register_shash(&alg);
+ }
+ pr_info("sparc64 crc32c opcode not available.\n");
+ return -ENODEV;
+}
+
+static void __exit crc32c_sparc64_mod_fini(void)
+{
+ crypto_unregister_shash(&alg);
+}
+
+module_init(crc32c_sparc64_mod_init);
+module_exit(crc32c_sparc64_mod_fini);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("CRC32c (Castagnoli), sparc64 crc32c opcode accelerated");
+
+MODULE_ALIAS("crc32c");