tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * Cryptographic API.
3 *
4 * Support for OMAP AES HW ACCELERATOR defines
5 *
6 * Copyright (c) 2015 Texas Instruments Incorporated
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as published
10 * by the Free Software Foundation.
11 *
12 */
13#ifndef __OMAP_AES_H__
14#define __OMAP_AES_H__
15
16#define DST_MAXBURST 4
17#define DMA_MIN (DST_MAXBURST * sizeof(u32))
18
19#define _calc_walked(inout) (dd->inout##_walk.offset - dd->inout##_sg->offset)
20
21/*
22 * OMAP TRM gives bitfields as start:end, where start is the higher bit
23 * number. For example 7:0
24 */
25#define FLD_MASK(start, end) (((1 << ((start) - (end) + 1)) - 1) << (end))
26#define FLD_VAL(val, start, end) (((val) << (end)) & FLD_MASK(start, end))
27
28#define AES_REG_KEY(dd, x) ((dd)->pdata->key_ofs - \
29 (((x) ^ 0x01) * 0x04))
30#define AES_REG_IV(dd, x) ((dd)->pdata->iv_ofs + ((x) * 0x04))
31
32#define AES_REG_CTRL(dd) ((dd)->pdata->ctrl_ofs)
33#define AES_REG_CTRL_CONTEXT_READY BIT(31)
34#define AES_REG_CTRL_CTR_WIDTH_MASK GENMASK(8, 7)
35#define AES_REG_CTRL_CTR_WIDTH_32 0
36#define AES_REG_CTRL_CTR_WIDTH_64 BIT(7)
37#define AES_REG_CTRL_CTR_WIDTH_96 BIT(8)
38#define AES_REG_CTRL_CTR_WIDTH_128 GENMASK(8, 7)
39#define AES_REG_CTRL_GCM GENMASK(17, 16)
40#define AES_REG_CTRL_CTR BIT(6)
41#define AES_REG_CTRL_CBC BIT(5)
42#define AES_REG_CTRL_KEY_SIZE GENMASK(4, 3)
43#define AES_REG_CTRL_DIRECTION BIT(2)
44#define AES_REG_CTRL_INPUT_READY BIT(1)
45#define AES_REG_CTRL_OUTPUT_READY BIT(0)
46#define AES_REG_CTRL_MASK GENMASK(24, 2)
47
48#define AES_REG_C_LEN_0 0x54
49#define AES_REG_C_LEN_1 0x58
50#define AES_REG_A_LEN 0x5C
51
52#define AES_REG_DATA_N(dd, x) ((dd)->pdata->data_ofs + ((x) * 0x04))
53#define AES_REG_TAG_N(dd, x) (0x70 + ((x) * 0x04))
54
55#define AES_REG_REV(dd) ((dd)->pdata->rev_ofs)
56
57#define AES_REG_MASK(dd) ((dd)->pdata->mask_ofs)
58#define AES_REG_MASK_SIDLE BIT(6)
59#define AES_REG_MASK_START BIT(5)
60#define AES_REG_MASK_DMA_OUT_EN BIT(3)
61#define AES_REG_MASK_DMA_IN_EN BIT(2)
62#define AES_REG_MASK_SOFTRESET BIT(1)
63#define AES_REG_AUTOIDLE BIT(0)
64
65#define AES_REG_LENGTH_N(x) (0x54 + ((x) * 0x04))
66
67#define AES_REG_IRQ_STATUS(dd) ((dd)->pdata->irq_status_ofs)
68#define AES_REG_IRQ_ENABLE(dd) ((dd)->pdata->irq_enable_ofs)
69#define AES_REG_IRQ_DATA_IN BIT(1)
70#define AES_REG_IRQ_DATA_OUT BIT(2)
71#define DEFAULT_TIMEOUT (5 * HZ)
72
73#define DEFAULT_AUTOSUSPEND_DELAY 1000
74
75#define FLAGS_MODE_MASK 0x001f
76#define FLAGS_ENCRYPT BIT(0)
77#define FLAGS_CBC BIT(1)
78#define FLAGS_CTR BIT(2)
79#define FLAGS_GCM BIT(3)
80#define FLAGS_RFC4106_GCM BIT(4)
81
82#define FLAGS_INIT BIT(5)
83#define FLAGS_FAST BIT(6)
84#define FLAGS_BUSY BIT(7)
85
86#define FLAGS_IN_DATA_ST_SHIFT 8
87#define FLAGS_OUT_DATA_ST_SHIFT 10
88#define FLAGS_ASSOC_DATA_ST_SHIFT 12
89
90#define AES_BLOCK_WORDS (AES_BLOCK_SIZE >> 2)
91
92struct omap_aes_gcm_result {
93 struct completion completion;
94 int err;
95};
96
97struct omap_aes_ctx {
98 int keylen;
99 u32 key[AES_KEYSIZE_256 / sizeof(u32)];
100 u8 nonce[4];
101 struct crypto_skcipher *fallback;
102 struct crypto_skcipher *ctr;
103};
104
105struct omap_aes_reqctx {
106 struct omap_aes_dev *dd;
107 unsigned long mode;
108 u8 iv[AES_BLOCK_SIZE];
109 u32 auth_tag[AES_BLOCK_SIZE / sizeof(u32)];
110};
111
112#define OMAP_AES_QUEUE_LENGTH 1
113#define OMAP_AES_CACHE_SIZE 0
114
115struct omap_aes_algs_info {
116 struct crypto_alg *algs_list;
117 unsigned int size;
118 unsigned int registered;
119};
120
121struct omap_aes_aead_algs {
122 struct aead_alg *algs_list;
123 unsigned int size;
124 unsigned int registered;
125};
126
127struct omap_aes_pdata {
128 struct omap_aes_algs_info *algs_info;
129 unsigned int algs_info_size;
130 struct omap_aes_aead_algs *aead_algs_info;
131
132 void (*trigger)(struct omap_aes_dev *dd, int length);
133
134 u32 key_ofs;
135 u32 iv_ofs;
136 u32 ctrl_ofs;
137 u32 data_ofs;
138 u32 rev_ofs;
139 u32 mask_ofs;
140 u32 irq_enable_ofs;
141 u32 irq_status_ofs;
142
143 u32 dma_enable_in;
144 u32 dma_enable_out;
145 u32 dma_start;
146
147 u32 major_mask;
148 u32 major_shift;
149 u32 minor_mask;
150 u32 minor_shift;
151};
152
153struct omap_aes_dev {
154 struct list_head list;
155 unsigned long phys_base;
156 void __iomem *io_base;
157 struct omap_aes_ctx *ctx;
158 struct device *dev;
159 unsigned long flags;
160 int err;
161
162 struct tasklet_struct done_task;
163 struct aead_queue aead_queue;
164 spinlock_t lock;
165
166 struct ablkcipher_request *req;
167 struct aead_request *aead_req;
168 struct crypto_engine *engine;
169
170 /*
171 * total is used by PIO mode for book keeping so introduce
172 * variable total_save as need it to calc page_order
173 */
174 size_t total;
175 size_t total_save;
176 size_t assoc_len;
177 size_t authsize;
178
179 struct scatterlist *in_sg;
180 struct scatterlist *out_sg;
181
182 /* Buffers for copying for unaligned cases */
183 struct scatterlist in_sgl[2];
184 struct scatterlist out_sgl;
185 struct scatterlist *orig_out;
186
187 struct scatter_walk in_walk;
188 struct scatter_walk out_walk;
189 struct dma_chan *dma_lch_in;
190 struct dma_chan *dma_lch_out;
191 int in_sg_len;
192 int out_sg_len;
193 int pio_only;
194 const struct omap_aes_pdata *pdata;
195};
196
197u32 omap_aes_read(struct omap_aes_dev *dd, u32 offset);
198void omap_aes_write(struct omap_aes_dev *dd, u32 offset, u32 value);
199struct omap_aes_dev *omap_aes_find_dev(struct omap_aes_reqctx *rctx);
200int omap_aes_gcm_setkey(struct crypto_aead *tfm, const u8 *key,
201 unsigned int keylen);
202int omap_aes_4106gcm_setkey(struct crypto_aead *tfm, const u8 *key,
203 unsigned int keylen);
204int omap_aes_gcm_encrypt(struct aead_request *req);
205int omap_aes_gcm_decrypt(struct aead_request *req);
206int omap_aes_4106gcm_encrypt(struct aead_request *req);
207int omap_aes_4106gcm_decrypt(struct aead_request *req);
208int omap_aes_write_ctrl(struct omap_aes_dev *dd);
209int omap_aes_crypt_dma_start(struct omap_aes_dev *dd);
210int omap_aes_crypt_dma_stop(struct omap_aes_dev *dd);
211void omap_aes_gcm_dma_out_callback(void *data);
212void omap_aes_clear_copy_flags(struct omap_aes_dev *dd);
213
214#endif