[v2,1/6] crypto/realtek: header definitions

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@gmx.de>
+ */
+
+#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