drivers/crypto/omap-aes.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  * Cryptographic API.
   4  *
   5  * Support for OMAP AES HW ACCELERATOR defines
   6  *
   7  * Copyright (c) 2015 Texas Instruments Incorporated
   8  */
   9 #ifndef __OMAP_AES_H__
  10 #define __OMAP_AES_H__
  11
  12 #include <crypto/engine.h>
  13
  14 #define DST_MAXBURST                    4
  15 #define DMA_MIN                         (DST_MAXBURST * sizeof(u32))
  16
  17 #define _calc_walked(inout) (dd->inout##_walk.offset - dd->inout##_sg->offset)
  18
  19 /*
  20  * OMAP TRM gives bitfields as start:end, where start is the higher bit
  21  * number. For example 7:0
  22  */
  23 #define FLD_MASK(start, end)    (((1 << ((start) - (end) + 1)) - 1) << (end))
  24 #define FLD_VAL(val, start, end) (((val) << (end)) & FLD_MASK(start, end))
  25
  26 #define AES_REG_KEY(dd, x)              ((dd)->pdata->key_ofs - \
  27                                                 (((x) ^ 0x01) * 0x04))
  28 #define AES_REG_IV(dd, x)               ((dd)->pdata->iv_ofs + ((x) * 0x04))
  29
  30 #define AES_REG_CTRL(dd)                ((dd)->pdata->ctrl_ofs)
  31 #define AES_REG_CTRL_CONTEXT_READY      BIT(31)
  32 #define AES_REG_CTRL_CTR_WIDTH_MASK     GENMASK(8, 7)
  33 #define AES_REG_CTRL_CTR_WIDTH_32       0
  34 #define AES_REG_CTRL_CTR_WIDTH_64       BIT(7)
  35 #define AES_REG_CTRL_CTR_WIDTH_96       BIT(8)
  36 #define AES_REG_CTRL_CTR_WIDTH_128      GENMASK(8, 7)
  37 #define AES_REG_CTRL_GCM                GENMASK(17, 16)
  38 #define AES_REG_CTRL_CTR                BIT(6)
  39 #define AES_REG_CTRL_CBC                BIT(5)
  40 #define AES_REG_CTRL_KEY_SIZE           GENMASK(4, 3)
  41 #define AES_REG_CTRL_DIRECTION          BIT(2)
  42 #define AES_REG_CTRL_INPUT_READY        BIT(1)
  43 #define AES_REG_CTRL_OUTPUT_READY       BIT(0)
  44 #define AES_REG_CTRL_MASK               GENMASK(24, 2)
  45
  46 #define AES_REG_C_LEN_0                 0x54
  47 #define AES_REG_C_LEN_1                 0x58
  48 #define AES_REG_A_LEN                   0x5C
  49
  50 #define AES_REG_DATA_N(dd, x)           ((dd)->pdata->data_ofs + ((x) * 0x04))
  51 #define AES_REG_TAG_N(dd, x)            (0x70 + ((x) * 0x04))
  52
  53 #define AES_REG_REV(dd)                 ((dd)->pdata->rev_ofs)
  54
  55 #define AES_REG_MASK(dd)                ((dd)->pdata->mask_ofs)
  56 #define AES_REG_MASK_SIDLE              BIT(6)
  57 #define AES_REG_MASK_START              BIT(5)
  58 #define AES_REG_MASK_DMA_OUT_EN         BIT(3)
  59 #define AES_REG_MASK_DMA_IN_EN          BIT(2)
  60 #define AES_REG_MASK_SOFTRESET          BIT(1)
  61 #define AES_REG_AUTOIDLE                BIT(0)
  62
  63 #define AES_REG_LENGTH_N(x)             (0x54 + ((x) * 0x04))
  64
  65 #define AES_REG_IRQ_STATUS(dd)         ((dd)->pdata->irq_status_ofs)
  66 #define AES_REG_IRQ_ENABLE(dd)         ((dd)->pdata->irq_enable_ofs)
  67 #define AES_REG_IRQ_DATA_IN            BIT(1)
  68 #define AES_REG_IRQ_DATA_OUT           BIT(2)
  69 #define DEFAULT_TIMEOUT         (5 * HZ)
  70
  71 #define DEFAULT_AUTOSUSPEND_DELAY       1000
  72
  73 #define FLAGS_MODE_MASK         0x001f
  74 #define FLAGS_ENCRYPT           BIT(0)
  75 #define FLAGS_CBC               BIT(1)
  76 #define FLAGS_CTR               BIT(2)
  77 #define FLAGS_GCM               BIT(3)
  78 #define FLAGS_RFC4106_GCM       BIT(4)
  79
  80 #define FLAGS_INIT              BIT(5)
  81 #define FLAGS_FAST              BIT(6)
  82 #define FLAGS_BUSY              BIT(7)
  83
  84 #define FLAGS_IN_DATA_ST_SHIFT  8
  85 #define FLAGS_OUT_DATA_ST_SHIFT 10
  86 #define FLAGS_ASSOC_DATA_ST_SHIFT       12
  87
  88 #define AES_BLOCK_WORDS         (AES_BLOCK_SIZE >> 2)
  89
  90 struct omap_aes_gcm_result {
  91         struct completion completion;
  92         int err;
  93 };
  94
  95 struct omap_aes_ctx {
  96         struct crypto_engine_ctx enginectx;
  97         int             keylen;
  98         u32             key[AES_KEYSIZE_256 / sizeof(u32)];
  99         u8              nonce[4];
 100         struct crypto_sync_skcipher     *fallback;
 101         struct crypto_skcipher  *ctr;
 102 };
 103
 104 struct omap_aes_reqctx {
 105         struct omap_aes_dev *dd;
 106         unsigned long mode;
 107         u8 iv[AES_BLOCK_SIZE];
 108         u32 auth_tag[AES_BLOCK_SIZE / sizeof(u32)];
 109 };
 110
 111 #define OMAP_AES_QUEUE_LENGTH   1
 112 #define OMAP_AES_CACHE_SIZE     0
 113
 114 struct omap_aes_algs_info {
 115         struct crypto_alg       *algs_list;
 116         unsigned int            size;
 117         unsigned int            registered;
 118 };
 119
 120 struct omap_aes_aead_algs {
 121         struct aead_alg *algs_list;
 122         unsigned int    size;
 123         unsigned int    registered;
 124 };
 125
 126 struct omap_aes_pdata {
 127         struct omap_aes_algs_info       *algs_info;
 128         unsigned int    algs_info_size;
 129         struct omap_aes_aead_algs       *aead_algs_info;
 130
 131         void            (*trigger)(struct omap_aes_dev *dd, int length);
 132
 133         u32             key_ofs;
 134         u32             iv_ofs;
 135         u32             ctrl_ofs;
 136         u32             data_ofs;
 137         u32             rev_ofs;
 138         u32             mask_ofs;
 139         u32             irq_enable_ofs;
 140         u32             irq_status_ofs;
 141
 142         u32             dma_enable_in;
 143         u32             dma_enable_out;
 144         u32             dma_start;
 145
 146         u32             major_mask;
 147         u32             major_shift;
 148         u32             minor_mask;
 149         u32             minor_shift;
 150 };
 151
 152 struct omap_aes_dev {
 153         struct list_head        list;
 154         unsigned long           phys_base;
 155         void __iomem            *io_base;
 156         struct omap_aes_ctx     *ctx;
 157         struct device           *dev;
 158         unsigned long           flags;
 159         int                     err;
 160
 161         struct tasklet_struct   done_task;
 162         struct aead_queue       aead_queue;
 163         spinlock_t              lock;
 164
 165         struct ablkcipher_request       *req;
 166         struct aead_request             *aead_req;
 167         struct crypto_engine            *engine;
 168
 169         /*
 170          * total is used by PIO mode for book keeping so introduce
 171          * variable total_save as need it to calc page_order
 172          */
 173         size_t                          total;
 174         size_t                          total_save;
 175         size_t                          assoc_len;
 176         size_t                          authsize;
 177
 178         struct scatterlist              *in_sg;
 179         struct scatterlist              *out_sg;
 180
 181         /* Buffers for copying for unaligned cases */
 182         struct scatterlist              in_sgl[2];
 183         struct scatterlist              out_sgl;
 184         struct scatterlist              *orig_out;
 185
 186         struct scatter_walk             in_walk;
 187         struct scatter_walk             out_walk;
 188         struct dma_chan         *dma_lch_in;
 189         struct dma_chan         *dma_lch_out;
 190         int                     in_sg_len;
 191         int                     out_sg_len;
 192         int                     pio_only;
 193         const struct omap_aes_pdata     *pdata;
 194 };
 195
 196 u32 omap_aes_read(struct omap_aes_dev *dd, u32 offset);
 197 void omap_aes_write(struct omap_aes_dev *dd, u32 offset, u32 value);
 198 struct omap_aes_dev *omap_aes_find_dev(struct omap_aes_reqctx *rctx);
 199 int omap_aes_gcm_setkey(struct crypto_aead *tfm, const u8 *key,
 200                         unsigned int keylen);
 201 int omap_aes_4106gcm_setkey(struct crypto_aead *tfm, const u8 *key,
 202                             unsigned int keylen);
 203 int omap_aes_gcm_encrypt(struct aead_request *req);
 204 int omap_aes_gcm_decrypt(struct aead_request *req);
 205 int omap_aes_4106gcm_encrypt(struct aead_request *req);
 206 int omap_aes_4106gcm_decrypt(struct aead_request *req);
 207 int omap_aes_write_ctrl(struct omap_aes_dev *dd);
 208 int omap_aes_crypt_dma_start(struct omap_aes_dev *dd);
 209 int omap_aes_crypt_dma_stop(struct omap_aes_dev *dd);
 210 void omap_aes_gcm_dma_out_callback(void *data);
 211 void omap_aes_clear_copy_flags(struct omap_aes_dev *dd);
 212
 213 #endif