1 | /* SPDX-License-Identifier: GPL-2.0 */ |
2 | /* |
3 | * amlogic.h - hardware cryptographic offloader for Amlogic SoC |
4 | * |
5 | * Copyright (C) 2018-2019 Corentin LABBE <clabbe@baylibre.com> |
6 | */ |
7 | #include <crypto/aes.h> |
8 | #include <crypto/engine.h> |
9 | #include <crypto/skcipher.h> |
10 | #include <linux/debugfs.h> |
11 | #include <linux/crypto.h> |
12 | #include <linux/scatterlist.h> |
13 | |
14 | #define MODE_KEY 1 |
15 | #define MODE_AES_128 0x8 |
16 | #define MODE_AES_192 0x9 |
17 | #define MODE_AES_256 0xa |
18 | |
19 | #define MESON_DECRYPT 0 |
20 | #define MESON_ENCRYPT 1 |
21 | |
22 | #define MESON_OPMODE_ECB 0 |
23 | #define MESON_OPMODE_CBC 1 |
24 | |
25 | #define MAXFLOW 2 |
26 | |
27 | #define MAXDESC 64 |
28 | |
29 | #define DESC_LAST BIT(18) |
30 | #define DESC_ENCRYPTION BIT(28) |
31 | #define DESC_OWN BIT(31) |
32 | |
33 | /* |
34 | * struct meson_desc - Descriptor for DMA operations |
35 | * Note that without datasheet, some are unknown |
36 | * @t_status: Descriptor of the cipher operation (see description below) |
37 | * @t_src: Physical address of data to read |
38 | * @t_dst: Physical address of data to write |
39 | * t_status is segmented like this: |
40 | * @len: 0-16 length of data to operate |
41 | * @irq: 17 Ignored by hardware |
42 | * @eoc: 18 End means the descriptor is the last |
43 | * @loop: 19 Unknown |
44 | * @mode: 20-23 Type of algorithm (AES, SHA) |
45 | * @begin: 24 Unknown |
46 | * @end: 25 Unknown |
47 | * @op_mode: 26-27 Blockmode (CBC, ECB) |
48 | * @enc: 28 0 means decryption, 1 is for encryption |
49 | * @block: 29 Unknown |
50 | * @error: 30 Unknown |
51 | * @owner: 31 owner of the descriptor, 1 own by HW |
52 | */ |
53 | struct meson_desc { |
54 | __le32 t_status; |
55 | __le32 t_src; |
56 | __le32 t_dst; |
57 | }; |
58 | |
59 | /* |
60 | * struct meson_flow - Information used by each flow |
61 | * @engine: ptr to the crypto_engine for this flow |
62 | * @keylen: keylen for this flow operation |
63 | * @complete: completion for the current task on this flow |
64 | * @status: set to 1 by interrupt if task is done |
65 | * @t_phy: Physical address of task |
66 | * @tl: pointer to the current ce_task for this flow |
67 | * @stat_req: number of request done by this flow |
68 | */ |
69 | struct meson_flow { |
70 | struct crypto_engine *engine; |
71 | struct completion complete; |
72 | int status; |
73 | unsigned int keylen; |
74 | dma_addr_t t_phy; |
75 | struct meson_desc *tl; |
76 | #ifdef CONFIG_CRYPTO_DEV_AMLOGIC_GXL_DEBUG |
77 | unsigned long stat_req; |
78 | #endif |
79 | }; |
80 | |
81 | /* |
82 | * struct meson_dev - main container for all this driver information |
83 | * @base: base address of amlogic-crypto |
84 | * @busclk: bus clock for amlogic-crypto |
85 | * @dev: the platform device |
86 | * @chanlist: array of all flow |
87 | * @flow: flow to use in next request |
88 | * @irqs: IRQ numbers for amlogic-crypto |
89 | * @dbgfs_dir: Debugfs dentry for statistic directory |
90 | * @dbgfs_stats: Debugfs dentry for statistic counters |
91 | */ |
92 | struct meson_dev { |
93 | void __iomem *base; |
94 | struct clk *busclk; |
95 | struct device *dev; |
96 | struct meson_flow *chanlist; |
97 | atomic_t flow; |
98 | int irqs[MAXFLOW]; |
99 | #ifdef CONFIG_CRYPTO_DEV_AMLOGIC_GXL_DEBUG |
100 | struct dentry *dbgfs_dir; |
101 | #endif |
102 | }; |
103 | |
104 | /* |
105 | * struct meson_cipher_req_ctx - context for a skcipher request |
106 | * @op_dir: direction (encrypt vs decrypt) for this request |
107 | * @flow: the flow to use for this request |
108 | */ |
109 | struct meson_cipher_req_ctx { |
110 | u32 op_dir; |
111 | int flow; |
112 | struct skcipher_request fallback_req; // keep at the end |
113 | }; |
114 | |
115 | /* |
116 | * struct meson_cipher_tfm_ctx - context for a skcipher TFM |
117 | * @key: pointer to key data |
118 | * @keylen: len of the key |
119 | * @keymode: The keymode(type and size of key) associated with this TFM |
120 | * @mc: pointer to the private data of driver handling this TFM |
121 | * @fallback_tfm: pointer to the fallback TFM |
122 | */ |
123 | struct meson_cipher_tfm_ctx { |
124 | u32 *key; |
125 | u32 keylen; |
126 | u32 keymode; |
127 | struct meson_dev *mc; |
128 | struct crypto_skcipher *fallback_tfm; |
129 | }; |
130 | |
131 | /* |
132 | * struct meson_alg_template - crypto_alg template |
133 | * @type: the CRYPTO_ALG_TYPE for this template |
134 | * @blockmode: the type of block operation |
135 | * @mc: pointer to the meson_dev structure associated with this template |
136 | * @alg: one of sub struct must be used |
137 | * @stat_req: number of request done on this template |
138 | * @stat_fb: total of all data len done on this template |
139 | */ |
140 | struct meson_alg_template { |
141 | u32 type; |
142 | u32 blockmode; |
143 | union { |
144 | struct skcipher_engine_alg skcipher; |
145 | } alg; |
146 | struct meson_dev *mc; |
147 | #ifdef CONFIG_CRYPTO_DEV_AMLOGIC_GXL_DEBUG |
148 | unsigned long stat_req; |
149 | unsigned long stat_fb; |
150 | #endif |
151 | }; |
152 | |
153 | int meson_enqueue(struct crypto_async_request *areq, u32 type); |
154 | |
155 | int meson_aes_setkey(struct crypto_skcipher *tfm, const u8 *key, |
156 | unsigned int keylen); |
157 | int meson_cipher_init(struct crypto_tfm *tfm); |
158 | void meson_cipher_exit(struct crypto_tfm *tfm); |
159 | int meson_skdecrypt(struct skcipher_request *areq); |
160 | int meson_skencrypt(struct skcipher_request *areq); |
161 | int meson_handle_cipher_request(struct crypto_engine *engine, void *areq); |
162 | |