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 <linux/device.h>
  12 #include "rk3288_crypto.h"
  13
  14 /*
  15  * IC can not process zero message hash,
  16  * so we put the fixed hash out when met zero message.
  17  */
  18
  19 static int zero_message_process(struct ahash_request *req)
  20 {
  21         struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
  22         int rk_digest_size = crypto_ahash_digestsize(tfm);
  23
  24         switch (rk_digest_size) {
  25         case SHA1_DIGEST_SIZE:
  26                 memcpy(req->result, sha1_zero_message_hash, rk_digest_size);
  27                 break;
  28         case SHA256_DIGEST_SIZE:
  29                 memcpy(req->result, sha256_zero_message_hash, rk_digest_size);
  30                 break;
  31         case MD5_DIGEST_SIZE:
  32                 memcpy(req->result, md5_zero_message_hash, rk_digest_size);
  33                 break;
  34         default:
  35                 return -EINVAL;
  36         }
  37
  38         return 0;
  39 }
  40
  41 static void rk_ahash_crypto_complete(struct crypto_async_request *base, int err)
  42 {
  43         if (base->complete)
  44                 base->complete(base, err);
  45 }
  46
  47 static void rk_ahash_reg_init(struct rk_crypto_info *dev)
  48 {
  49         struct ahash_request *req = ahash_request_cast(dev->async_req);
  50         struct rk_ahash_rctx *rctx = ahash_request_ctx(req);
  51         int reg_status;
  52
  53         reg_status = CRYPTO_READ(dev, RK_CRYPTO_CTRL) |
  54                      RK_CRYPTO_HASH_FLUSH | _SBF(0xffff, 16);
  55         CRYPTO_WRITE(dev, RK_CRYPTO_CTRL, reg_status);
  56
  57         reg_status = CRYPTO_READ(dev, RK_CRYPTO_CTRL);
  58         reg_status &= (~RK_CRYPTO_HASH_FLUSH);
  59         reg_status |= _SBF(0xffff, 16);
  60         CRYPTO_WRITE(dev, RK_CRYPTO_CTRL, reg_status);
  61
  62         memset_io(dev->reg + RK_CRYPTO_HASH_DOUT_0, 0, 32);
  63
  64         CRYPTO_WRITE(dev, RK_CRYPTO_INTENA, RK_CRYPTO_HRDMA_ERR_ENA |
  65                                             RK_CRYPTO_HRDMA_DONE_ENA);
  66
  67         CRYPTO_WRITE(dev, RK_CRYPTO_INTSTS, RK_CRYPTO_HRDMA_ERR_INT |
  68                                             RK_CRYPTO_HRDMA_DONE_INT);
  69
  70         CRYPTO_WRITE(dev, RK_CRYPTO_HASH_CTRL, rctx->mode |
  71                                                RK_CRYPTO_HASH_SWAP_DO);
  72
  73         CRYPTO_WRITE(dev, RK_CRYPTO_CONF, RK_CRYPTO_BYTESWAP_HRFIFO |
  74                                           RK_CRYPTO_BYTESWAP_BRFIFO |
  75                                           RK_CRYPTO_BYTESWAP_BTFIFO);
  76
  77         CRYPTO_WRITE(dev, RK_CRYPTO_HASH_MSG_LEN, dev->total);
  78 }
  79
  80 static int rk_ahash_init(struct ahash_request *req)
  81 {
  82         struct rk_ahash_rctx *rctx = ahash_request_ctx(req);
  83         struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
  84         struct rk_ahash_ctx *ctx = crypto_ahash_ctx(tfm);
  85
  86         ahash_request_set_tfm(&rctx->fallback_req, ctx->fallback_tfm);
  87         rctx->fallback_req.base.flags = req->base.flags &
  88                                         CRYPTO_TFM_REQ_MAY_SLEEP;
  89
  90         return crypto_ahash_init(&rctx->fallback_req);
  91 }
  92
  93 static int rk_ahash_update(struct ahash_request *req)
  94 {
  95         struct rk_ahash_rctx *rctx = ahash_request_ctx(req);
  96         struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
  97         struct rk_ahash_ctx *ctx = crypto_ahash_ctx(tfm);
  98
  99         ahash_request_set_tfm(&rctx->fallback_req, ctx->fallback_tfm);
 100         rctx->fallback_req.base.flags = req->base.flags &
 101                                         CRYPTO_TFM_REQ_MAY_SLEEP;
 102         rctx->fallback_req.nbytes = req->nbytes;
 103         rctx->fallback_req.src = req->src;
 104
 105         return crypto_ahash_update(&rctx->fallback_req);
 106 }
 107
 108 static int rk_ahash_final(struct ahash_request *req)
 109 {
 110         struct rk_ahash_rctx *rctx = ahash_request_ctx(req);
 111         struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
 112         struct rk_ahash_ctx *ctx = crypto_ahash_ctx(tfm);
 113
 114         ahash_request_set_tfm(&rctx->fallback_req, ctx->fallback_tfm);
 115         rctx->fallback_req.base.flags = req->base.flags &
 116                                         CRYPTO_TFM_REQ_MAY_SLEEP;
 117         rctx->fallback_req.result = req->result;
 118
 119         return crypto_ahash_final(&rctx->fallback_req);
 120 }
 121
 122 static int rk_ahash_finup(struct ahash_request *req)
 123 {
 124         struct rk_ahash_rctx *rctx = ahash_request_ctx(req);
 125         struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
 126         struct rk_ahash_ctx *ctx = crypto_ahash_ctx(tfm);
 127
 128         ahash_request_set_tfm(&rctx->fallback_req, ctx->fallback_tfm);
 129         rctx->fallback_req.base.flags = req->base.flags &
 130                                         CRYPTO_TFM_REQ_MAY_SLEEP;
 131
 132         rctx->fallback_req.nbytes = req->nbytes;
 133         rctx->fallback_req.src = req->src;
 134         rctx->fallback_req.result = req->result;
 135
 136         return crypto_ahash_finup(&rctx->fallback_req);
 137 }
 138
 139 static int rk_ahash_import(struct ahash_request *req, const void *in)
 140 {
 141         struct rk_ahash_rctx *rctx = ahash_request_ctx(req);
 142         struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
 143         struct rk_ahash_ctx *ctx = crypto_ahash_ctx(tfm);
 144
 145         ahash_request_set_tfm(&rctx->fallback_req, ctx->fallback_tfm);
 146         rctx->fallback_req.base.flags = req->base.flags &
 147                                         CRYPTO_TFM_REQ_MAY_SLEEP;
 148
 149         return crypto_ahash_import(&rctx->fallback_req, in);
 150 }
 151
 152 static int rk_ahash_export(struct ahash_request *req, void *out)
 153 {
 154         struct rk_ahash_rctx *rctx = ahash_request_ctx(req);
 155         struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
 156         struct rk_ahash_ctx *ctx = crypto_ahash_ctx(tfm);
 157
 158         ahash_request_set_tfm(&rctx->fallback_req, ctx->fallback_tfm);
 159         rctx->fallback_req.base.flags = req->base.flags &
 160                                         CRYPTO_TFM_REQ_MAY_SLEEP;
 161
 162         return crypto_ahash_export(&rctx->fallback_req, out);
 163 }
 164
 165 static int rk_ahash_digest(struct ahash_request *req)
 166 {
 167         struct rk_ahash_ctx *tctx = crypto_tfm_ctx(req->base.tfm);
 168         struct rk_crypto_info *dev = tctx->dev;
 169
 170         if (!req->nbytes)
 171                 return zero_message_process(req);
 172         else
 173                 return dev->enqueue(dev, &req->base);
 174 }
 175
 176 static void crypto_ahash_dma_start(struct rk_crypto_info *dev)
 177 {
 178         CRYPTO_WRITE(dev, RK_CRYPTO_HRDMAS, dev->addr_in);
 179         CRYPTO_WRITE(dev, RK_CRYPTO_HRDMAL, (dev->count + 3) / 4);
 180         CRYPTO_WRITE(dev, RK_CRYPTO_CTRL, RK_CRYPTO_HASH_START |
 181                                           (RK_CRYPTO_HASH_START << 16));
 182 }
 183
 184 static int rk_ahash_set_data_start(struct rk_crypto_info *dev)
 185 {
 186         int err;
 187
 188         err = dev->load_data(dev, dev->sg_src, NULL);
 189         if (!err)
 190                 crypto_ahash_dma_start(dev);
 191         return err;
 192 }
 193
 194 static int rk_ahash_start(struct rk_crypto_info *dev)
 195 {
 196         struct ahash_request *req = ahash_request_cast(dev->async_req);
 197         struct crypto_ahash *tfm;
 198         struct rk_ahash_rctx *rctx;
 199
 200         dev->total = req->nbytes;
 201         dev->left_bytes = req->nbytes;
 202         dev->aligned = 0;
 203         dev->align_size = 4;
 204         dev->sg_dst = NULL;
 205         dev->sg_src = req->src;
 206         dev->first = req->src;
 207         dev->src_nents = sg_nents(req->src);
 208         rctx = ahash_request_ctx(req);
 209         rctx->mode = 0;
 210
 211         tfm = crypto_ahash_reqtfm(req);
 212         switch (crypto_ahash_digestsize(tfm)) {
 213         case SHA1_DIGEST_SIZE:
 214                 rctx->mode = RK_CRYPTO_HASH_SHA1;
 215                 break;
 216         case SHA256_DIGEST_SIZE:
 217                 rctx->mode = RK_CRYPTO_HASH_SHA256;
 218                 break;
 219         case MD5_DIGEST_SIZE:
 220                 rctx->mode = RK_CRYPTO_HASH_MD5;
 221                 break;
 222         default:
 223                 return -EINVAL;
 224         }
 225
 226         rk_ahash_reg_init(dev);
 227         return rk_ahash_set_data_start(dev);
 228 }
 229
 230 static int rk_ahash_crypto_rx(struct rk_crypto_info *dev)
 231 {
 232         int err = 0;
 233         struct ahash_request *req = ahash_request_cast(dev->async_req);
 234         struct crypto_ahash *tfm;
 235
 236         dev->unload_data(dev);
 237         if (dev->left_bytes) {
 238                 if (dev->aligned) {
 239                         if (sg_is_last(dev->sg_src)) {
 240                                 dev_warn(dev->dev, "[%s:%d], Lack of data\n",
 241                                          __func__, __LINE__);
 242                                 err = -ENOMEM;
 243                                 goto out_rx;
 244                         }
 245                         dev->sg_src = sg_next(dev->sg_src);
 246                 }
 247                 err = rk_ahash_set_data_start(dev);
 248         } else {
 249                 /*
 250                  * it will take some time to process date after last dma
 251                  * transmission.
 252                  *
 253                  * waiting time is relative with the last date len,
 254                  * so cannot set a fixed time here.
 255                  * 10us makes system not call here frequently wasting
 256                  * efficiency, and make it response quickly when dma
 257                  * complete.
 258                  */
 259                 while (!CRYPTO_READ(dev, RK_CRYPTO_HASH_STS))
 260                         udelay(10);
 261
 262                 tfm = crypto_ahash_reqtfm(req);
 263                 memcpy_fromio(req->result, dev->reg + RK_CRYPTO_HASH_DOUT_0,
 264                               crypto_ahash_digestsize(tfm));
 265                 dev->complete(dev->async_req, 0);
 266                 tasklet_schedule(&dev->queue_task);
 267         }
 268
 269 out_rx:
 270         return err;
 271 }
 272
 273 static int rk_cra_hash_init(struct crypto_tfm *tfm)
 274 {
 275         struct rk_ahash_ctx *tctx = crypto_tfm_ctx(tfm);
 276         struct rk_crypto_tmp *algt;
 277         struct ahash_alg *alg = __crypto_ahash_alg(tfm->__crt_alg);
 278
 279         const char *alg_name = crypto_tfm_alg_name(tfm);
 280
 281         algt = container_of(alg, struct rk_crypto_tmp, alg.hash);
 282
 283         tctx->dev = algt->dev;
 284         tctx->dev->addr_vir = (void *)__get_free_page(GFP_KERNEL);
 285         if (!tctx->dev->addr_vir) {
 286                 dev_err(tctx->dev->dev, "failed to kmalloc for addr_vir\n");
 287                 return -ENOMEM;
 288         }
 289         tctx->dev->start = rk_ahash_start;
 290         tctx->dev->update = rk_ahash_crypto_rx;
 291         tctx->dev->complete = rk_ahash_crypto_complete;
 292
 293         /* for fallback */
 294         tctx->fallback_tfm = crypto_alloc_ahash(alg_name, 0,
 295                                                CRYPTO_ALG_NEED_FALLBACK);
 296         if (IS_ERR(tctx->fallback_tfm)) {
 297                 dev_err(tctx->dev->dev, "Could not load fallback driver.\n");
 298                 return PTR_ERR(tctx->fallback_tfm);
 299         }
 300         crypto_ahash_set_reqsize(__crypto_ahash_cast(tfm),
 301                                  sizeof(struct rk_ahash_rctx) +
 302                                  crypto_ahash_reqsize(tctx->fallback_tfm));
 303
 304         return tctx->dev->enable_clk(tctx->dev);
 305 }
 306
 307 static void rk_cra_hash_exit(struct crypto_tfm *tfm)
 308 {
 309         struct rk_ahash_ctx *tctx = crypto_tfm_ctx(tfm);
 310
 311         free_page((unsigned long)tctx->dev->addr_vir);
 312         return tctx->dev->disable_clk(tctx->dev);
 313 }
 314
 315 struct rk_crypto_tmp rk_ahash_sha1 = {
 316         .type = ALG_TYPE_HASH,
 317         .alg.hash = {
 318                 .init = rk_ahash_init,
 319                 .update = rk_ahash_update,
 320                 .final = rk_ahash_final,
 321                 .finup = rk_ahash_finup,
 322                 .export = rk_ahash_export,
 323                 .import = rk_ahash_import,
 324                 .digest = rk_ahash_digest,
 325                 .halg = {
 326                          .digestsize = SHA1_DIGEST_SIZE,
 327                          .statesize = sizeof(struct sha1_state),
 328                          .base = {
 329                                   .cra_name = "sha1",
 330                                   .cra_driver_name = "rk-sha1",
 331                                   .cra_priority = 300,
 332                                   .cra_flags = CRYPTO_ALG_ASYNC |
 333                                                CRYPTO_ALG_NEED_FALLBACK,
 334                                   .cra_blocksize = SHA1_BLOCK_SIZE,
 335                                   .cra_ctxsize = sizeof(struct rk_ahash_ctx),
 336                                   .cra_alignmask = 3,
 337                                   .cra_init = rk_cra_hash_init,
 338                                   .cra_exit = rk_cra_hash_exit,
 339                                   .cra_module = THIS_MODULE,
 340                                   }
 341                          }
 342         }
 343 };
 344
 345 struct rk_crypto_tmp rk_ahash_sha256 = {
 346         .type = ALG_TYPE_HASH,
 347         .alg.hash = {
 348                 .init = rk_ahash_init,
 349                 .update = rk_ahash_update,
 350                 .final = rk_ahash_final,
 351                 .finup = rk_ahash_finup,
 352                 .export = rk_ahash_export,
 353                 .import = rk_ahash_import,
 354                 .digest = rk_ahash_digest,
 355                 .halg = {
 356                          .digestsize = SHA256_DIGEST_SIZE,
 357                          .statesize = sizeof(struct sha256_state),
 358                          .base = {
 359                                   .cra_name = "sha256",
 360                                   .cra_driver_name = "rk-sha256",
 361                                   .cra_priority = 300,
 362                                   .cra_flags = CRYPTO_ALG_ASYNC |
 363                                                CRYPTO_ALG_NEED_FALLBACK,
 364                                   .cra_blocksize = SHA256_BLOCK_SIZE,
 365                                   .cra_ctxsize = sizeof(struct rk_ahash_ctx),
 366                                   .cra_alignmask = 3,
 367                                   .cra_init = rk_cra_hash_init,
 368                                   .cra_exit = rk_cra_hash_exit,
 369                                   .cra_module = THIS_MODULE,
 370                                   }
 371                          }
 372         }
 373 };
 374
 375 struct rk_crypto_tmp rk_ahash_md5 = {
 376         .type = ALG_TYPE_HASH,
 377         .alg.hash = {
 378                 .init = rk_ahash_init,
 379                 .update = rk_ahash_update,
 380                 .final = rk_ahash_final,
 381                 .finup = rk_ahash_finup,
 382                 .export = rk_ahash_export,
 383                 .import = rk_ahash_import,
 384                 .digest = rk_ahash_digest,
 385                 .halg = {
 386                          .digestsize = MD5_DIGEST_SIZE,
 387                          .statesize = sizeof(struct md5_state),
 388                          .base = {
 389                                   .cra_name = "md5",
 390                                   .cra_driver_name = "rk-md5",
 391                                   .cra_priority = 300,
 392                                   .cra_flags = CRYPTO_ALG_ASYNC |
 393                                                CRYPTO_ALG_NEED_FALLBACK,
 394                                   .cra_blocksize = SHA1_BLOCK_SIZE,
 395                                   .cra_ctxsize = sizeof(struct rk_ahash_ctx),
 396                                   .cra_alignmask = 3,
 397                                   .cra_init = rk_cra_hash_init,
 398                                   .cra_exit = rk_cra_hash_exit,
 399                                   .cra_module = THIS_MODULE,
 400                                   }
 401                         }
 402         }
 403 };