1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 * sun4i-ss.h - hardware cryptographic accelerator for Allwinner A20 SoC
4 *
5 * Copyright (C) 2013-2015 Corentin LABBE <clabbe.montjoie@gmail.com>
6 *
7 * Support AES cipher with 128,192,256 bits keysize.
8 * Support MD5 and SHA1 hash algorithms.
9 * Support DES and 3DES
10 *
11 * You could find the datasheet in Documentation/arch/arm/sunxi.rst
12 */
13
14#include <linux/clk.h>
15#include <linux/crypto.h>
16#include <linux/io.h>
17#include <linux/module.h>
18#include <linux/of.h>
19#include <linux/platform_device.h>
20#include <linux/reset.h>
21#include <crypto/scatterwalk.h>
22#include <linux/scatterlist.h>
23#include <linux/interrupt.h>
24#include <linux/delay.h>
25#include <linux/pm_runtime.h>
26#include <crypto/md5.h>
27#include <crypto/skcipher.h>
28#include <crypto/sha1.h>
29#include <crypto/hash.h>
30#include <crypto/internal/hash.h>
31#include <crypto/internal/skcipher.h>
32#include <crypto/aes.h>
33#include <crypto/internal/des.h>
34#include <crypto/internal/rng.h>
35#include <crypto/rng.h>
36
37#define SS_CTL            0x00
38#define SS_KEY0           0x04
39#define SS_KEY1           0x08
40#define SS_KEY2           0x0C
41#define SS_KEY3           0x10
42#define SS_KEY4           0x14
43#define SS_KEY5           0x18
44#define SS_KEY6           0x1C
45#define SS_KEY7           0x20
46
47#define SS_IV0            0x24
48#define SS_IV1            0x28
49#define SS_IV2            0x2C
50#define SS_IV3            0x30
51
52#define SS_FCSR           0x44
53
54#define SS_MD0            0x4C
55#define SS_MD1            0x50
56#define SS_MD2            0x54
57#define SS_MD3            0x58
58#define SS_MD4            0x5C
59
60#define SS_RXFIFO         0x200
61#define SS_TXFIFO         0x204
62
63/* SS_CTL configuration values */
64
65/* PRNG generator mode - bit 15 */
66#define SS_PRNG_ONESHOT		(0 << 15)
67#define SS_PRNG_CONTINUE	(1 << 15)
68
69/* IV mode for hash */
70#define SS_IV_ARBITRARY		(1 << 14)
71
72/* SS operation mode - bits 12-13 */
73#define SS_ECB			(0 << 12)
74#define SS_CBC			(1 << 12)
75#define SS_CTS			(3 << 12)
76
77/* Counter width for CNT mode - bits 10-11 */
78#define SS_CNT_16BITS		(0 << 10)
79#define SS_CNT_32BITS		(1 << 10)
80#define SS_CNT_64BITS		(2 << 10)
81
82/* Key size for AES - bits 8-9 */
83#define SS_AES_128BITS		(0 << 8)
84#define SS_AES_192BITS		(1 << 8)
85#define SS_AES_256BITS		(2 << 8)
86
87/* Operation direction - bit 7 */
88#define SS_ENCRYPTION		(0 << 7)
89#define SS_DECRYPTION		(1 << 7)
90
91/* SS Method - bits 4-6 */
92#define SS_OP_AES		(0 << 4)
93#define SS_OP_DES		(1 << 4)
94#define SS_OP_3DES		(2 << 4)
95#define SS_OP_SHA1		(3 << 4)
96#define SS_OP_MD5		(4 << 4)
97#define SS_OP_PRNG		(5 << 4)
98
99/* Data end bit - bit 2 */
100#define SS_DATA_END		(1 << 2)
101
102/* PRNG start bit - bit 1 */
103#define SS_PRNG_START		(1 << 1)
104
105/* SS Enable bit - bit 0 */
106#define SS_DISABLED		(0 << 0)
107#define SS_ENABLED		(1 << 0)
108
109/* SS_FCSR configuration values */
110/* RX FIFO status - bit 30 */
111#define SS_RXFIFO_FREE		(1 << 30)
112
113/* RX FIFO empty spaces - bits 24-29 */
114#define SS_RXFIFO_SPACES(val)	(((val) >> 24) & 0x3f)
115
116/* TX FIFO status - bit 22 */
117#define SS_TXFIFO_AVAILABLE	(1 << 22)
118
119/* TX FIFO available spaces - bits 16-21 */
120#define SS_TXFIFO_SPACES(val)	(((val) >> 16) & 0x3f)
121
122#define SS_RX_MAX	32
123#define SS_RX_DEFAULT	SS_RX_MAX
124#define SS_TX_MAX	33
125
126#define SS_RXFIFO_EMP_INT_PENDING	(1 << 10)
127#define SS_TXFIFO_AVA_INT_PENDING	(1 << 8)
128#define SS_RXFIFO_EMP_INT_ENABLE	(1 << 2)
129#define SS_TXFIFO_AVA_INT_ENABLE	(1 << 0)
130
131#define SS_SEED_LEN 192
132#define SS_DATA_LEN 160
133
134/*
135 * struct ss_variant - Describe SS hardware variant
136 * @sha1_in_be:		The SHA1 digest is given by SS in BE, and so need to be inverted.
137 */
138struct ss_variant {
139	bool sha1_in_be;
140};
141
142struct sun4i_ss_ctx {
143	const struct ss_variant *variant;
144	void __iomem *base;
145	int irq;
146	struct clk *busclk;
147	struct clk *ssclk;
148	struct reset_control *reset;
149	struct device *dev;
150	struct resource *res;
151	char buf[4 * SS_RX_MAX];/* buffer for linearize SG src */
152	char bufo[4 * SS_TX_MAX]; /* buffer for linearize SG dst */
153	spinlock_t slock; /* control the use of the device */
154#ifdef CONFIG_CRYPTO_DEV_SUN4I_SS_PRNG
155	u32 seed[SS_SEED_LEN / BITS_PER_LONG];
156#endif
157	struct dentry *dbgfs_dir;
158	struct dentry *dbgfs_stats;
159};
160
161struct sun4i_ss_alg_template {
162	u32 type;
163	u32 mode;
164	union {
165		struct skcipher_alg crypto;
166		struct ahash_alg hash;
167		struct rng_alg rng;
168	} alg;
169	struct sun4i_ss_ctx *ss;
170	unsigned long stat_req;
171	unsigned long stat_fb;
172	unsigned long stat_bytes;
173	unsigned long stat_opti;
174};
175
176struct sun4i_tfm_ctx {
177	u32 key[AES_MAX_KEY_SIZE / 4];/* divided by sizeof(u32) */
178	u32 keylen;
179	u32 keymode;
180	struct sun4i_ss_ctx *ss;
181	struct crypto_skcipher *fallback_tfm;
182};
183
184struct sun4i_cipher_req_ctx {
185	u32 mode;
186	u8 backup_iv[AES_BLOCK_SIZE];
187	struct skcipher_request fallback_req;   // keep at the end
188};
189
190struct sun4i_req_ctx {
191	u32 mode;
192	u64 byte_count; /* number of bytes "uploaded" to the device */
193	u32 hash[5]; /* for storing SS_IVx register */
194	char buf[64];
195	unsigned int len;
196	int flags;
197};
198
199int sun4i_hash_crainit(struct crypto_tfm *tfm);
200void sun4i_hash_craexit(struct crypto_tfm *tfm);
201int sun4i_hash_init(struct ahash_request *areq);
202int sun4i_hash_update(struct ahash_request *areq);
203int sun4i_hash_final(struct ahash_request *areq);
204int sun4i_hash_finup(struct ahash_request *areq);
205int sun4i_hash_digest(struct ahash_request *areq);
206int sun4i_hash_export_md5(struct ahash_request *areq, void *out);
207int sun4i_hash_import_md5(struct ahash_request *areq, const void *in);
208int sun4i_hash_export_sha1(struct ahash_request *areq, void *out);
209int sun4i_hash_import_sha1(struct ahash_request *areq, const void *in);
210
211int sun4i_ss_cbc_aes_encrypt(struct skcipher_request *areq);
212int sun4i_ss_cbc_aes_decrypt(struct skcipher_request *areq);
213int sun4i_ss_ecb_aes_encrypt(struct skcipher_request *areq);
214int sun4i_ss_ecb_aes_decrypt(struct skcipher_request *areq);
215
216int sun4i_ss_cbc_des_encrypt(struct skcipher_request *areq);
217int sun4i_ss_cbc_des_decrypt(struct skcipher_request *areq);
218int sun4i_ss_ecb_des_encrypt(struct skcipher_request *areq);
219int sun4i_ss_ecb_des_decrypt(struct skcipher_request *areq);
220
221int sun4i_ss_cbc_des3_encrypt(struct skcipher_request *areq);
222int sun4i_ss_cbc_des3_decrypt(struct skcipher_request *areq);
223int sun4i_ss_ecb_des3_encrypt(struct skcipher_request *areq);
224int sun4i_ss_ecb_des3_decrypt(struct skcipher_request *areq);
225
226int sun4i_ss_cipher_init(struct crypto_tfm *tfm);
227void sun4i_ss_cipher_exit(struct crypto_tfm *tfm);
228int sun4i_ss_aes_setkey(struct crypto_skcipher *tfm, const u8 *key,
229			unsigned int keylen);
230int sun4i_ss_des_setkey(struct crypto_skcipher *tfm, const u8 *key,
231			unsigned int keylen);
232int sun4i_ss_des3_setkey(struct crypto_skcipher *tfm, const u8 *key,
233			 unsigned int keylen);
234int sun4i_ss_prng_generate(struct crypto_rng *tfm, const u8 *src,
235			   unsigned int slen, u8 *dst, unsigned int dlen);
236int sun4i_ss_prng_seed(struct crypto_rng *tfm, const u8 *seed, unsigned int slen);
237