drivers/crypto/rockchip/rk3288_crypto_ahash.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Crypto acceleration support for Rockchip RK3288
   4  *
   5  * Copyright (c) 2015, Fuzhou Rockchip Electronics Co., Ltd
   6  *
   7  * Author: Zain Wang <zain.wang@rock-chips.com>
   8  *
   9  * Some ideas are from marvell/cesa.c and s5p-sss.c driver.
  10  */
  11 #include "rk3288_crypto.h"
  12
  13 /*
  14  * IC can not process zero message hash,
  15  * so we put the fixed hash out when met zero message.
  16  */
  17
  18 static int zero_message_process(struct ahash_request *req)
  19 {
  20         struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
  21         int rk_digest_size = crypto_ahash_digestsize(tfm);
  22
  23         switch (rk_digest_size) {
  24         case SHA1_DIGEST_SIZE:
  25                 memcpy(req->result, sha1_zero_message_hash, rk_digest_size);
  26                 break;
  27         case SHA256_DIGEST_SIZE:
  28                 memcpy(req->result, sha256_zero_message_hash, rk_digest_size);
  29                 break;
  30         case MD5_DIGEST_SIZE:
  31                 memcpy(req->result, md5_zero_message_hash, rk_digest_size);
  32                 break;
  33         default:
  34                 return -EINVAL;
  35         }
  36
  37         return 0;
  38 }
  39
  40 static void rk_ahash_crypto_complete(struct crypto_async_request *base, int err)
  41 {
  42         if (base->complete)
  43                 base->complete(base, err);
  44 }
  45
  46 static void rk_ahash_reg_init(struct rk_crypto_info *dev)
  47 {
  48         struct ahash_request *req = ahash_request_cast(dev->async_req);
  49         struct rk_ahash_rctx *rctx = ahash_request_ctx(req);
  50         int reg_status = 0;
  51
  52         reg_status = CRYPTO_READ(dev, RK_CRYPTO_CTRL) |
  53                      RK_CRYPTO_HASH_FLUSH | _SBF(0xffff, 16);
  54         CRYPTO_WRITE(dev, RK_CRYPTO_CTRL, reg_status);
  55
  56         reg_status = CRYPTO_READ(dev, RK_CRYPTO_CTRL);
  57         reg_status &= (~RK_CRYPTO_HASH_FLUSH);
  58         reg_status |= _SBF(0xffff, 16);
  59         CRYPTO_WRITE(dev, RK_CRYPTO_CTRL, reg_status);
  60
  61         memset_io(dev->reg + RK_CRYPTO_HASH_DOUT_0, 0, 32);
  62
  63         CRYPTO_WRITE(dev, RK_CRYPTO_INTENA, RK_CRYPTO_HRDMA_ERR_ENA |
  64                                             RK_CRYPTO_HRDMA_DONE_ENA);
  65
  66         CRYPTO_WRITE(dev, RK_CRYPTO_INTSTS, RK_CRYPTO_HRDMA_ERR_INT |
  67                                             RK_CRYPTO_HRDMA_DONE_INT);
  68
  69         CRYPTO_WRITE(dev, RK_CRYPTO_HASH_CTRL, rctx->mode |
  70                                                RK_CRYPTO_HASH_SWAP_DO);
  71
  72         CRYPTO_WRITE(dev, RK_CRYPTO_CONF, RK_CRYPTO_BYTESWAP_HRFIFO |
  73                                           RK_CRYPTO_BYTESWAP_BRFIFO |
  74                                           RK_CRYPTO_BYTESWAP_BTFIFO);
  75
  76         CRYPTO_WRITE(dev, RK_CRYPTO_HASH_MSG_LEN, dev->total);
  77 }
  78
  79 static int rk_ahash_init(struct ahash_request *req)
  80 {
  81         struct rk_ahash_rctx *rctx = ahash_request_ctx(req);
  82         struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
  83         struct rk_ahash_ctx *ctx = crypto_ahash_ctx(tfm);
  84
  85         ahash_request_set_tfm(&rctx->fallback_req, ctx->fallback_tfm);
  86         rctx->fallback_req.base.flags = req->base.flags &
  87                                         CRYPTO_TFM_REQ_MAY_SLEEP;
  88
  89         return crypto_ahash_init(&rctx->fallback_req);
  90 }
  91
  92 static int rk_ahash_update(struct ahash_request *req)
  93 {
  94         struct rk_ahash_rctx *rctx = ahash_request_ctx(req);
  95         struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
  96         struct rk_ahash_ctx *ctx = crypto_ahash_ctx(tfm);
  97
  98         ahash_request_set_tfm(&rctx->fallback_req, ctx->fallback_tfm);
  99         rctx->fallback_req.base.flags = req->base.flags &
 100                                         CRYPTO_TFM_REQ_MAY_SLEEP;
 101         rctx->fallback_req.nbytes = req->nbytes;
 102         rctx->fallback_req.src = req->src;
 103
 104         return crypto_ahash_update(&rctx->fallback_req);
 105 }
 106
 107 static int rk_ahash_final(struct ahash_request *req)
 108 {
 109         struct rk_ahash_rctx *rctx = ahash_request_ctx(req);
 110         struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
 111         struct rk_ahash_ctx *ctx = crypto_ahash_ctx(tfm);
 112
 113         ahash_request_set_tfm(&rctx->fallback_req, ctx->fallback_tfm);
 114         rctx->fallback_req.base.flags = req->base.flags &
 115                                         CRYPTO_TFM_REQ_MAY_SLEEP;
 116         rctx->fallback_req.result = req->result;
 117
 118         return crypto_ahash_final(&rctx->fallback_req);
 119 }
 120
 121 static int rk_ahash_finup(struct ahash_request *req)
 122 {
 123         struct rk_ahash_rctx *rctx = ahash_request_ctx(req);
 124         struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
 125         struct rk_ahash_ctx *ctx = crypto_ahash_ctx(tfm);
 126
 127         ahash_request_set_tfm(&rctx->fallback_req, ctx->fallback_tfm);
 128         rctx->fallback_req.base.flags = req->base.flags &
 129                                         CRYPTO_TFM_REQ_MAY_SLEEP;
 130
 131         rctx->fallback_req.nbytes = req->nbytes;
 132         rctx->fallback_req.src = req->src;
 133         rctx->fallback_req.result = req->result;
 134
 135         return crypto_ahash_finup(&rctx->fallback_req);
 136 }
 137
 138 static int rk_ahash_import(struct ahash_request *req, const void *in)
 139 {
 140         struct rk_ahash_rctx *rctx = ahash_request_ctx(req);
 141         struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
 142         struct rk_ahash_ctx *ctx = crypto_ahash_ctx(tfm);
 143
 144         ahash_request_set_tfm(&rctx->fallback_req, ctx->fallback_tfm);
 145         rctx->fallback_req.base.flags = req->base.flags &
 146                                         CRYPTO_TFM_REQ_MAY_SLEEP;
 147
 148         return crypto_ahash_import(&rctx->fallback_req, in);
 149 }
 150
 151 static int rk_ahash_export(struct ahash_request *req, void *out)
 152 {
 153         struct rk_ahash_rctx *rctx = ahash_request_ctx(req);
 154         struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
 155         struct rk_ahash_ctx *ctx = crypto_ahash_ctx(tfm);
 156
 157         ahash_request_set_tfm(&rctx->fallback_req, ctx->fallback_tfm);
 158         rctx->fallback_req.base.flags = req->base.flags &
 159                                         CRYPTO_TFM_REQ_MAY_SLEEP;
 160
 161         return crypto_ahash_export(&rctx->fallback_req, out);
 162 }
 163
 164 static int rk_ahash_digest(struct ahash_request *req)
 165 {
 166         struct rk_ahash_ctx *tctx = crypto_tfm_ctx(req->base.tfm);
 167         struct rk_crypto_info *dev = tctx->dev;
 168
 169         if (!req->nbytes)
 170                 return zero_message_process(req);
 171         else
 172                 return dev->enqueue(dev, &req->base);
 173 }
 174
 175 static void crypto_ahash_dma_start(struct rk_crypto_info *dev)
 176 {
 177         CRYPTO_WRITE(dev, RK_CRYPTO_HRDMAS, dev->addr_in);
 178         CRYPTO_WRITE(dev, RK_CRYPTO_HRDMAL, (dev->count + 3) / 4);
 179         CRYPTO_WRITE(dev, RK_CRYPTO_CTRL, RK_CRYPTO_HASH_START |
 180                                           (RK_CRYPTO_HASH_START << 16));
 181 }
 182
 183 static int rk_ahash_set_data_start(struct rk_crypto_info *dev)
 184 {
 185         int err;
 186
 187         err = dev->load_data(dev, dev->sg_src, NULL);
 188         if (!err)
 189                 crypto_ahash_dma_start(dev);
 190         return err;
 191 }
 192
 193 static int rk_ahash_start(struct rk_crypto_info *dev)
 194 {
 195         struct ahash_request *req = ahash_request_cast(dev->async_req);
 196         struct crypto_ahash *tfm;
 197         struct rk_ahash_rctx *rctx;
 198
 199         dev->total = req->nbytes;
 200         dev->left_bytes = req->nbytes;
 201         dev->aligned = 0;
 202         dev->align_size = 4;
 203         dev->sg_dst = NULL;
 204         dev->sg_src = req->src;
 205         dev->first = req->src;
 206         dev->src_nents = sg_nents(req->src);
 207         rctx = ahash_request_ctx(req);
 208         rctx->mode = 0;
 209
 210         tfm = crypto_ahash_reqtfm(req);
 211         switch (crypto_ahash_digestsize(tfm)) {
 212         case SHA1_DIGEST_SIZE:
 213                 rctx->mode = RK_CRYPTO_HASH_SHA1;
 214                 break;
 215         case SHA256_DIGEST_SIZE:
 216                 rctx->mode = RK_CRYPTO_HASH_SHA256;
 217                 break;
 218         case MD5_DIGEST_SIZE:
 219                 rctx->mode = RK_CRYPTO_HASH_MD5;
 220                 break;
 221         default:
 222                 return -EINVAL;
 223         }
 224
 225         rk_ahash_reg_init(dev);
 226         return rk_ahash_set_data_start(dev);
 227 }
 228
 229 static int rk_ahash_crypto_rx(struct rk_crypto_info *dev)
 230 {
 231         int err = 0;
 232         struct ahash_request *req = ahash_request_cast(dev->async_req);
 233         struct crypto_ahash *tfm;
 234
 235         dev->unload_data(dev);
 236         if (dev->left_bytes) {
 237                 if (dev->aligned) {
 238                         if (sg_is_last(dev->sg_src)) {
 239                                 dev_warn(dev->dev, "[%s:%d], Lack of data\n",
 240                                          __func__, __LINE__);
 241                                 err = -ENOMEM;
 242                                 goto out_rx;
 243                         }
 244                         dev->sg_src = sg_next(dev->sg_src);
 245                 }
 246                 err = rk_ahash_set_data_start(dev);
 247         } else {
 248                 /*
 249                  * it will take some time to process date after last dma
 250                  * transmission.
 251                  *
 252                  * waiting time is relative with the last date len,
 253                  * so cannot set a fixed time here.
 254                  * 10us makes system not call here frequently wasting
 255                  * efficiency, and make it response quickly when dma
 256                  * complete.
 257                  */
 258                 while (!CRYPTO_READ(dev, RK_CRYPTO_HASH_STS))
 259                         udelay(10);
 260
 261                 tfm = crypto_ahash_reqtfm(req);
 262                 memcpy_fromio(req->result, dev->reg + RK_CRYPTO_HASH_DOUT_0,
 263                               crypto_ahash_digestsize(tfm));
 264                 dev->complete(dev->async_req, 0);
 265                 tasklet_schedule(&dev->queue_task);
 266         }
 267
 268 out_rx:
 269         return err;
 270 }
 271
 272 static int rk_cra_hash_init(struct crypto_tfm *tfm)
 273 {
 274         struct rk_ahash_ctx *tctx = crypto_tfm_ctx(tfm);
 275         struct rk_crypto_tmp *algt;
 276         struct ahash_alg *alg = __crypto_ahash_alg(tfm->__crt_alg);
 277
 278         const char *alg_name = crypto_tfm_alg_name(tfm);
 279
 280         algt = container_of(alg, struct rk_crypto_tmp, alg.hash);
 281
 282         tctx->dev = algt->dev;
 283         tctx->dev->addr_vir = (void *)__get_free_page(GFP_KERNEL);
 284         if (!tctx->dev->addr_vir) {
 285                 dev_err(tctx->dev->dev, "failed to kmalloc for addr_vir\n");
 286                 return -ENOMEM;
 287         }
 288         tctx->dev->start = rk_ahash_start;
 289         tctx->dev->update = rk_ahash_crypto_rx;
 290         tctx->dev->complete = rk_ahash_crypto_complete;
 291
 292         /* for fallback */
 293         tctx->fallback_tfm = crypto_alloc_ahash(alg_name, 0,
 294                                                CRYPTO_ALG_NEED_FALLBACK);
 295         if (IS_ERR(tctx->fallback_tfm)) {
 296                 dev_err(tctx->dev->dev, "Could not load fallback driver.\n");
 297                 return PTR_ERR(tctx->fallback_tfm);
 298         }
 299         crypto_ahash_set_reqsize(__crypto_ahash_cast(tfm),
 300                                  sizeof(struct rk_ahash_rctx) +
 301                                  crypto_ahash_reqsize(tctx->fallback_tfm));
 302
 303         return tctx->dev->enable_clk(tctx->dev);
 304 }
 305
 306 static void rk_cra_hash_exit(struct crypto_tfm *tfm)
 307 {
 308         struct rk_ahash_ctx *tctx = crypto_tfm_ctx(tfm);
 309
 310         free_page((unsigned long)tctx->dev->addr_vir);
 311         return tctx->dev->disable_clk(tctx->dev);
 312 }
 313
 314 struct rk_crypto_tmp rk_ahash_sha1 = {
 315         .type = ALG_TYPE_HASH,
 316         .alg.hash = {
 317                 .init = rk_ahash_init,
 318                 .update = rk_ahash_update,
 319                 .final = rk_ahash_final,
 320                 .finup = rk_ahash_finup,
 321                 .export = rk_ahash_export,
 322                 .import = rk_ahash_import,
 323                 .digest = rk_ahash_digest,
 324                 .halg = {
 325                          .digestsize = SHA1_DIGEST_SIZE,
 326                          .statesize = sizeof(struct sha1_state),
 327                          .base = {
 328                                   .cra_name = "sha1",
 329                                   .cra_driver_name = "rk-sha1",
 330                                   .cra_priority = 300,
 331                                   .cra_flags = CRYPTO_ALG_ASYNC |
 332                                                CRYPTO_ALG_NEED_FALLBACK,
 333                                   .cra_blocksize = SHA1_BLOCK_SIZE,
 334                                   .cra_ctxsize = sizeof(struct rk_ahash_ctx),
 335                                   .cra_alignmask = 3,
 336                                   .cra_init = rk_cra_hash_init,
 337                                   .cra_exit = rk_cra_hash_exit,
 338                                   .cra_module = THIS_MODULE,
 339                                   }
 340                          }
 341         }
 342 };
 343
 344 struct rk_crypto_tmp rk_ahash_sha256 = {
 345         .type = ALG_TYPE_HASH,
 346         .alg.hash = {
 347                 .init = rk_ahash_init,
 348                 .update = rk_ahash_update,
 349                 .final = rk_ahash_final,
 350                 .finup = rk_ahash_finup,
 351                 .export = rk_ahash_export,
 352                 .import = rk_ahash_import,
 353                 .digest = rk_ahash_digest,
 354                 .halg = {
 355                          .digestsize = SHA256_DIGEST_SIZE,
 356                          .statesize = sizeof(struct sha256_state),
 357                          .base = {
 358                                   .cra_name = "sha256",
 359                                   .cra_driver_name = "rk-sha256",
 360                                   .cra_priority = 300,
 361                                   .cra_flags = CRYPTO_ALG_ASYNC |
 362                                                CRYPTO_ALG_NEED_FALLBACK,
 363                                   .cra_blocksize = SHA256_BLOCK_SIZE,
 364                                   .cra_ctxsize = sizeof(struct rk_ahash_ctx),
 365                                   .cra_alignmask = 3,
 366                                   .cra_init = rk_cra_hash_init,
 367                                   .cra_exit = rk_cra_hash_exit,
 368                                   .cra_module = THIS_MODULE,
 369                                   }
 370                          }
 371         }
 372 };
 373
 374 struct rk_crypto_tmp rk_ahash_md5 = {
 375         .type = ALG_TYPE_HASH,
 376         .alg.hash = {
 377                 .init = rk_ahash_init,
 378                 .update = rk_ahash_update,
 379                 .final = rk_ahash_final,
 380                 .finup = rk_ahash_finup,
 381                 .export = rk_ahash_export,
 382                 .import = rk_ahash_import,
 383                 .digest = rk_ahash_digest,
 384                 .halg = {
 385                          .digestsize = MD5_DIGEST_SIZE,
 386                          .statesize = sizeof(struct md5_state),
 387                          .base = {
 388                                   .cra_name = "md5",
 389                                   .cra_driver_name = "rk-md5",
 390                                   .cra_priority = 300,
 391                                   .cra_flags = CRYPTO_ALG_ASYNC |
 392                                                CRYPTO_ALG_NEED_FALLBACK,
 393                                   .cra_blocksize = SHA1_BLOCK_SIZE,
 394                                   .cra_ctxsize = sizeof(struct rk_ahash_ctx),
 395                                   .cra_alignmask = 3,
 396                                   .cra_init = rk_cra_hash_init,
 397                                   .cra_exit = rk_cra_hash_exit,
 398                                   .cra_module = THIS_MODULE,
 399                                   }
 400                         }
 401         }
 402 };