Add header definitions for new Realtek crypto device.
Signed-off-by: Markus Stockhausen <markus.stockhausen@xxxxxx>
---
drivers/crypto/realtek/realtek_crypto.h | 325 ++++++++++++++++++++++++
1 file changed, 325 insertions(+)
create mode 100644 drivers/crypto/realtek/realtek_crypto.h
diff --git a/drivers/crypto/realtek/realtek_crypto.h b/drivers/crypto/realtek/realtek_crypto.h
new file mode 100644
index 000000000000..35d9de5eca7a
--- /dev/null
+++ b/drivers/crypto/realtek/realtek_crypto.h
@@ -0,0 +1,325 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Crypto acceleration support for Realtek crypto engine. Based on ideas from
+ * Rockchip & SafeXcel driver plus Realtek OpenWrt RTK.
+ *
+ * Copyright (c) 2022, Markus Stockhausen <markus.stockhausen@xxxxxx>
+ */
+
+#ifndef __REALTEK_CRYPTO_H__
+#define __REALTEK_CRYPTO_H__
+
+#include <linux/interrupt.h>
+#include <crypto/aes.h>
+#include <crypto/md5.h>
+#include <crypto/hash.h>
+#include <crypto/sha1.h>
+#include <crypto/skcipher.h>
+
+/*
+ * The four engine registers for instrumentation of the hardware.
+ */
+#define RTCR_REG_SRC 0x0 /* Source descriptor starting address */
+#define RTCR_REG_DST 0x4 /* Destination Descriptor starting address */
+#define RTCR_REG_CMD 0x8 /* Command/Status Register */
+#define RTCR_REG_CTR 0xC /* Control Register */
+/*
+ * Engine Command/Status Register.
+ */
+#define RTCR_CMD_SDUEIP BIT(15) /* Src desc unavail error interrupt pending */
+#define RTCR_CMD_SDLEIP BIT(14) /* Src desc length error interrupt pending */
+#define RTCR_CMD_DDUEIP BIT(13) /* Dst desc unavail error interrupt pending */
+#define RTCR_CMD_DDOKIP BIT(12) /* Dst dsec ok interrupt pending */
+#define RTCR_CMD_DABFIP BIT(11) /* Data address buffer interrupt pending */
+#define RTCR_CMD_POLL BIT(1) /* Descriptor polling. Set to kick engine */
+#define RTCR_CMD_SRST BIT(0) /* Software reset, write 1 to reset */
+/*
+ * Engine Control Register
+ */
+#define RTCR_CTR_SDUEIE BIT(15) /* Src desc unavail error interrupt enable */
+#define RTCR_CTR_SDLEIE BIT(14) /* Src desc length error interrupt enable */
+#define RTCR_CTR_DDUEIE BIT(13) /* Dst desc unavail error interrupt enable */
+#define RTCR_CTR_DDOKIE BIT(12) /* Dst desc ok interrupt enable */
+#define RTCR_CTR_DABFIE BIT(11) /* Data address buffer interrupt enable */
+#define RTCR_CTR_LBKM BIT(8) /* Loopback mode enable */
+#define RTCR_CTR_SAWB BIT(7) /* Source address write back = work inplace */
+#define RTCR_CTR_CKE BIT(6) /* Clock enable */
+#define RTCR_CTR_DDMMSK 0x38 /* Destination DMA max burst size mask */
+#define RTCR_CTR_DDM16 0x00 /* Destination DMA max burst size 16 bytes */
+#define RTCR_CTR_DDM32 0x08 /* Destination DMA max burst size 32 bytes */
+#define RTCR_CTR_DDM64 0x10 /* Destination DMA max burst size 64 bytes */
+#define RTCR_CTR_DDM128 0x18 /* Destination DMA max burst size 128 bytes */
+#define RTCR_CTR_SDMMSK 0x07 /* Source DMA max burst size mask */
+#define RTCR_CTR_SDM16 0x00 /* Source DMA max burst size 16 bytes */
+#define RTCR_CTR_SDM32 0x01 /* Source DMA max burst size 32 bytes */
+#define RTCR_CTR_SDM64 0x02 /* Source DMA max burst size 64 bytes */
+#define RTCR_CTR_SDM128 0x03 /* Source DMA max burst size 128 bytes */
+
+/*
+ * Module settings and constants. Some of the limiter values have been chosen
+ * based on testing (e.g. ring sizes). Others are based on real hardware
+ * limits (e.g. scatter, request size, hash size).
+ */
+#define RTCR_SRC_RING_SIZE 64
+#define RTCR_DST_RING_SIZE 16
+#define RTCR_BUF_RING_SIZE 32768
+#define RTCR_MAX_REQ_SIZE 8192
+#define RTCR_MAX_SG 8
+#define RTCR_MAX_SG_AHASH (RTCR_MAX_SG - 1)
+#define RTCR_MAX_SG_SKCIPHER (RTCR_MAX_SG - 3)
+#define RTCR_HASH_VECTOR_SIZE SHA1_DIGEST_SIZE
+
+#define RTCR_ALG_AHASH 0
+#define RTCR_ALG_SKCIPHER 1
+
+#define RTCR_HASH_UPDATE BIT(0)
+#define RTCR_HASH_FINAL BIT(1)
+#define RTCR_HASH_BUF_SIZE SHA1_BLOCK_SIZE
+#define RTCR_HASH_PAD_SIZE ((SHA1_BLOCK_SIZE + 8) / sizeof(u64))
+
+#define RTCR_REQ_SG_MASK 0xff
+#define RTCR_REQ_MD5 BIT(8)
+#define RTCR_REQ_SHA1 BIT(9)
+#define RTCR_REQ_FB_ACT BIT(10)
+#define RTCR_REQ_FB_RDY BIT(11)
+
+/*
+ * Crypto ring source data descripter. This data is fed into the engine. It
+ * takes all information about the input data and the type of cypher/hash
+ * algorithm that we want to apply. Each request consists of several source
+ * descriptors.
+ */
+struct rtcr_src_desc {
+ u32 opmode;
+ u32 len;
+ u32 dummy;
+ phys_addr_t paddr;
+};
+
+#define RTCR_SRC_DESC_SIZE (sizeof(struct rtcr_src_desc))
+/*
+ * Owner: This flag identifies the owner of the block. When we send the
+ * descripter to the ring set this flag to 1. Once the crypto engine has
+ * finished processing this will be reset to 0.
+ */
+#define RTCR_SRC_OP_OWN_ASIC BIT(31)
+#define RTCR_SRC_OP_OWN_CPU 0
+/*
+ * End of ring: Setting this flag to 1 tells the crypto engine that this is
+ * the last descriptor of the whole ring (not the request). If set the engine
+ * will not increase the processing pointer afterwards but will jump back to
+ * the first descriptor address it was initialized with.
+ */
+#define RTCR_SRC_OP_EOR BIT(30)
+#define RTCR_SRC_OP_CALC_EOR(idx) ((idx == RTCR_SRC_RING_SIZE - 1) ? \
+ RTCR_SRC_OP_EOR : 0)
+/*
+ * First segment: If set to 1 this is the first descriptor of a request. All
+ * descriptors that follow will have this flag set to 0 belong to the same
+ * request.
+ */
+#define RTCR_SRC_OP_FS BIT(29)
+/*
+ * Mode select: Set to 00b for crypto only, set to 01b for hash only, 10b for
+ * hash then crypto or 11b for crypto then hash.
+ */
+#define RTCR_SRC_OP_MS_CRYPTO 0
+#define RTCR_SRC_OP_MS_HASH BIT(26)
+#define RTCR_SRC_OP_MS_HASH_CRYPTO BIT(27)
+#define RTCR_SRC_OP_MS_CRYPTO_HASH GENMASK(27, 26)
+/*
+ * Key application management: Only relevant for cipher (AES/3DES/DES) mode. If
+ * using AES or DES it has to be set to 0 (000b) for decryption and 7 (111b) for
+ * encryption. For 3DES it has to be set to 2 (010b = decrypt, encrypt, decrypt)
+ * for decryption and 5 (101b = encrypt, decrypt, encrypt) for encryption.
+ */
+#define RTCR_SRC_OP_KAM_DEC 0
+#define RTCR_SRC_OP_KAM_ENC GENMASK(25, 23)
+#define RTCR_SRC_OP_KAM_3DES_DEC BIT(24)
+#define RTCR_SRC_OP_KAM_3DES_ENC (BIT(23) | BIT(25))
+/*
+ * AES/3DES/DES mode & key length: Upper two bits for AES mode. If set to values
+ * other than 0 we want to encrypt/decrypt with AES. The values are 01b for 128
+ * bit key length, 10b for 192 bit key length and 11b for 256 bit key length.
+ * If AES is disabled (upper two bits 00b) then the lowest bit determines if we
+ * want to use 3DES (1) or DES (0).
+ */
+#define RTCR_SRC_OP_CIPHER_FROM_KEY(k) ((k - 8) << 18)
+#define RTCR_SRC_OP_CIPHER_AES_128 BIT(21)
+#define RTCR_SRC_OP_CIPHER_AES_192 BIT(22)
+#define RTCR_SRC_OP_CIPHER_AES_256 GENMASK(22, 21)
+#define RTCR_SRC_OP_CIPHER_3DES BIT(20)
+#define RTCR_SRC_OP_CIPHER_DES 0
+#define RTCR_SRC_OP_CIPHER_MASK GENMASK(22, 20)
+/*
+ * Cipher block mode: Determines the block mode of a cipher request. Set to 00b
+ * for ECB, 01b for CTR and 10b for CTR.
+ */
+#define RTCR_SRC_OP_CRYPT_ECB 0
+#define RTCR_SRC_OP_CRYPT_CTR BIT(18)
+#define RTCR_SRC_OP_CRYPT_CBC BIT(19)
+/*
+ * Hash mode: Set to 1 for MD5 or 0 for SHA1 calculation.
+ */
+#define RTCR_SRC_OP_HASH_MD5 BIT(16)
+#define RTCR_SRC_OP_HASH_SHA1 0
+
+#define RTCR_SRC_OP_DUMMY_LEN 128
+
+/*
+ * Crypto ring destination data descriptor. Data inside will be fed to the
+ * engine and if we process a hash request we get the resulting hash from here.
+ * Each request consists of exactly one destination descriptor.
+ */
+struct rtcr_dst_desc {
+ u32 opmode;
+ phys_addr_t paddr;
+ u32 dummy;
+ u32 vector[RTCR_HASH_VECTOR_SIZE / sizeof(u32)];
+};
+
+#define RTCR_DST_DESC_SIZE (sizeof(struct rtcr_dst_desc))
+/*
+ * Owner: This flag identifies the owner of the block. When we send the
+ * descripter to the ring set this flag to 1. Once the crypto engine has
+ * finished processing this will be reset to 0.
+ */
+#define RTCR_DST_OP_OWN_ASIC BIT(31)
+#define RTCR_DST_OP_OWN_CPU 0
+/*
+ * End of ring: Setting this flag to 1 tells the crypto engine that this is
+ * the last descriptor of the whole ring (not the request). If set the engine
+ * will not increase the processing pointer afterwards but will jump back to
+ * the first descriptor address it was initialized with.
+ */
+#define RTCR_DST_OP_EOR BIT(30)
+#define RTCR_DST_OP_CALC_EOR(idx) ((idx == RTCR_DST_RING_SIZE - 1) ? \
+ RTCR_DST_OP_EOR : 0)
+
+/*
+ * Writeback descriptor. This descriptor maintains additional data per request
+ * about writebac. E.g. the hash result or a cipher that was written to the
+ * internal buffer only. Remember the post processing information here.
+ */
+struct rtcr_wbk_desc {
+ void *dst;
+ void *src;
+ int off;
+ int len;
+};
+/*
+ * To keep the size of the descriptor a power of 2 (cache line aligned) the
+ * length field can denote special writeback requests that need another type of
+ * postprocessing.
+ */
+#define RTCR_WB_LEN_DONE (0)
+#define RTCR_WB_LEN_HASH (-1)
+#define RTCR_WB_LEN_SG_DIRECT (-2)
+
+struct rtcr_crypto_dev {
+ char buf_ring[RTCR_BUF_RING_SIZE];
+ struct rtcr_src_desc src_ring[RTCR_SRC_RING_SIZE];
+ struct rtcr_dst_desc dst_ring[RTCR_DST_RING_SIZE];
+ struct rtcr_wbk_desc wbk_ring[RTCR_DST_RING_SIZE];
+
+ /* modified under ring lock */
+ int cpu_src_idx;
+ int cpu_dst_idx;
+ int cpu_buf_idx;
+
+ /* modified in (serialized) tasklet */
+ int pp_src_idx;
+ int pp_dst_idx;
+ int pp_buf_idx;
+
+ /* modified under asic lock */
+ int asic_dst_idx;
+ int asic_src_idx;
+ bool busy;
+
+ int irq;
+ spinlock_t asiclock;
+ spinlock_t ringlock;
+ struct tasklet_struct done_task;
+ wait_queue_head_t done_queue;
+
+ void __iomem *base;
+
+ struct platform_device *pdev;
+ struct device *dev;
+};
+
+struct rtcr_alg_template {
+ struct rtcr_crypto_dev *cdev;
+ int type;
+ int opmode;
+ union {
+ struct skcipher_alg skcipher;
+ struct ahash_alg ahash;
+ } alg;
+};
+
+struct rtcr_ahash_ctx {
+ struct rtcr_crypto_dev *cdev;
+ struct crypto_ahash *fback;
+ int opmode;
+};
+
+struct rtcr_ahash_req {
+ int state;
+ /* Data from here is lost if fallback switch happens */
+ u32 vector[RTCR_HASH_VECTOR_SIZE];
+ u64 totallen;
+ char buf[RTCR_HASH_BUF_SIZE];
+ int buflen;
+};
+
+union rtcr_fallback_state {
+ struct md5_state md5;
+ struct sha1_state sha1;
+};
+
+struct rtcr_skcipher_ctx {
+ struct rtcr_crypto_dev *cdev;
+ int opmode;
+ int keylen;
+ u32 key_enc[AES_KEYSIZE_256 / sizeof(u32)];
+ u32 key_dec[AES_KEYSIZE_256 / sizeof(u32)];
+};
+
+extern struct rtcr_alg_template rtcr_ahash_md5;
+extern struct rtcr_alg_template rtcr_ahash_sha1;
+extern struct rtcr_alg_template rtcr_skcipher_ecb_aes;
+extern struct rtcr_alg_template rtcr_skcipher_cbc_aes;
+extern struct rtcr_alg_template rtcr_skcipher_ctr_aes;
+
+extern void rtcr_lock_ring(struct rtcr_crypto_dev *cdev);
+extern void rtcr_unlock_ring(struct rtcr_crypto_dev *cdev);
+
+extern int rtcr_alloc_ring(struct rtcr_crypto_dev *cdev, int srclen,
+ int *srcidx, int *dstidx, int buflen, char **buf);
+extern void rtcr_add_src_ahash_to_ring(struct rtcr_crypto_dev *cdev, int idx,
+ int opmode, int totallen);
+extern void rtcr_add_src_pad_to_ring(struct rtcr_crypto_dev *cdev,
+ int idx, int len);
+extern void rtcr_add_src_skcipher_to_ring(struct rtcr_crypto_dev *cdev, int idx,
+ int opmode, int totallen,
+ struct rtcr_skcipher_ctx *sctx);
+extern void rtcr_add_src_to_ring(struct rtcr_crypto_dev *cdev, int idx,
+ void *vaddr, int blocklen, int totallen);
+extern void rtcr_add_wbk_to_ring(struct rtcr_crypto_dev *cdev, int idx,
+ void *dst, int off);
+extern void rtcr_add_dst_to_ring(struct rtcr_crypto_dev *cdev, int idx,
+ void *reqdst, int reqlen, void *wbkdst,
+ int wbkoff);
+
+extern void rtcr_kick_engine(struct rtcr_crypto_dev *cdev);
+
+extern void rtcr_prepare_request(struct rtcr_crypto_dev *cdev);
+extern void rtcr_finish_request(struct rtcr_crypto_dev *cdev, int opmode,
+ int totallen);
+extern int rtcr_wait_for_request(struct rtcr_crypto_dev *cdev, int idx);
+
+extern inline int rtcr_inc_src_idx(int idx, int cnt);
+extern inline int rtcr_inc_dst_idx(int idx, int cnt);
+#endif
--
2.38.1
