drivers/crypto/marvell/cesa.c

   1 /*
   2  * Support for Marvell's Cryptographic Engine and Security Accelerator (CESA)
   3  * that can be found on the following platform: Orion, Kirkwood, Armada. This
   4  * driver supports the TDMA engine on platforms on which it is available.
   5  *
   6  * Author: Boris Brezillon <boris.brezillon@free-electrons.com>
   7  * Author: Arnaud Ebalard <arno@natisbad.org>
   8  *
   9  * This work is based on an initial version written by
  10  * Sebastian Andrzej Siewior < sebastian at breakpoint dot cc >
  11  *
  12  * This program is free software; you can redistribute it and/or modify it
  13  * under the terms of the GNU General Public License version 2 as published
  14  * by the Free Software Foundation.
  15  */
  16
  17 #include <linux/delay.h>
  18 #include <linux/genalloc.h>
  19 #include <linux/interrupt.h>
  20 #include <linux/io.h>
  21 #include <linux/kthread.h>
  22 #include <linux/mbus.h>
  23 #include <linux/platform_device.h>
  24 #include <linux/scatterlist.h>
  25 #include <linux/slab.h>
  26 #include <linux/module.h>
  27 #include <linux/clk.h>
  28 #include <linux/of.h>
  29 #include <linux/of_platform.h>
  30 #include <linux/of_irq.h>
  31
  32 #include "cesa.h"
  33
  34 static int allhwsupport = !IS_ENABLED(CONFIG_CRYPTO_DEV_MV_CESA);
  35 module_param_named(allhwsupport, allhwsupport, int, 0444);
  36 MODULE_PARM_DESC(allhwsupport, "Enable support for all hardware (even it if overlaps with the mv_cesa driver)");
  37
  38 struct mv_cesa_dev *cesa_dev;
  39
  40 static void mv_cesa_dequeue_req_unlocked(struct mv_cesa_engine *engine)
  41 {
  42         struct crypto_async_request *req, *backlog;
  43         struct mv_cesa_ctx *ctx;
  44
  45         spin_lock_bh(&cesa_dev->lock);
  46         backlog = crypto_get_backlog(&cesa_dev->queue);
  47         req = crypto_dequeue_request(&cesa_dev->queue);
  48         engine->req = req;
  49         spin_unlock_bh(&cesa_dev->lock);
  50
  51         if (!req)
  52                 return;
  53
  54         if (backlog)
  55                 backlog->complete(backlog, -EINPROGRESS);
  56
  57         ctx = crypto_tfm_ctx(req->tfm);
  58         ctx->ops->prepare(req, engine);
  59         ctx->ops->step(req);
  60 }
  61
  62 static irqreturn_t mv_cesa_int(int irq, void *priv)
  63 {
  64         struct mv_cesa_engine *engine = priv;
  65         struct crypto_async_request *req;
  66         struct mv_cesa_ctx *ctx;
  67         u32 status, mask;
  68         irqreturn_t ret = IRQ_NONE;
  69
  70         while (true) {
  71                 int res;
  72
  73                 mask = mv_cesa_get_int_mask(engine);
  74                 status = readl(engine->regs + CESA_SA_INT_STATUS);
  75
  76                 if (!(status & mask))
  77                         break;
  78
  79                 /*
  80                  * TODO: avoid clearing the FPGA_INT_STATUS if this not
  81                  * relevant on some platforms.
  82                  */
  83                 writel(~status, engine->regs + CESA_SA_FPGA_INT_STATUS);
  84                 writel(~status, engine->regs + CESA_SA_INT_STATUS);
  85
  86                 ret = IRQ_HANDLED;
  87                 spin_lock_bh(&engine->lock);
  88                 req = engine->req;
  89                 spin_unlock_bh(&engine->lock);
  90                 if (req) {
  91                         ctx = crypto_tfm_ctx(req->tfm);
  92                         res = ctx->ops->process(req, status & mask);
  93                         if (res != -EINPROGRESS) {
  94                                 spin_lock_bh(&engine->lock);
  95                                 engine->req = NULL;
  96                                 mv_cesa_dequeue_req_unlocked(engine);
  97                                 spin_unlock_bh(&engine->lock);
  98                                 ctx->ops->cleanup(req);
  99                                 local_bh_disable();
 100                                 req->complete(req, res);
 101                                 local_bh_enable();
 102                         } else {
 103                                 ctx->ops->step(req);
 104                         }
 105                 }
 106         }
 107
 108         return ret;
 109 }
 110
 111 int mv_cesa_queue_req(struct crypto_async_request *req)
 112 {
 113         int ret;
 114         int i;
 115
 116         spin_lock_bh(&cesa_dev->lock);
 117         ret = crypto_enqueue_request(&cesa_dev->queue, req);
 118         spin_unlock_bh(&cesa_dev->lock);
 119
 120         if (ret != -EINPROGRESS)
 121                 return ret;
 122
 123         for (i = 0; i < cesa_dev->caps->nengines; i++) {
 124                 spin_lock_bh(&cesa_dev->engines[i].lock);
 125                 if (!cesa_dev->engines[i].req)
 126                         mv_cesa_dequeue_req_unlocked(&cesa_dev->engines[i]);
 127                 spin_unlock_bh(&cesa_dev->engines[i].lock);
 128         }
 129
 130         return -EINPROGRESS;
 131 }
 132
 133 static int mv_cesa_add_algs(struct mv_cesa_dev *cesa)
 134 {
 135         int ret;
 136         int i, j;
 137
 138         for (i = 0; i < cesa->caps->ncipher_algs; i++) {
 139                 ret = crypto_register_alg(cesa->caps->cipher_algs[i]);
 140                 if (ret)
 141                         goto err_unregister_crypto;
 142         }
 143
 144         for (i = 0; i < cesa->caps->nahash_algs; i++) {
 145                 ret = crypto_register_ahash(cesa->caps->ahash_algs[i]);
 146                 if (ret)
 147                         goto err_unregister_ahash;
 148         }
 149
 150         return 0;
 151
 152 err_unregister_ahash:
 153         for (j = 0; j < i; j++)
 154                 crypto_unregister_ahash(cesa->caps->ahash_algs[j]);
 155         i = cesa->caps->ncipher_algs;
 156
 157 err_unregister_crypto:
 158         for (j = 0; j < i; j++)
 159                 crypto_unregister_alg(cesa->caps->cipher_algs[j]);
 160
 161         return ret;
 162 }
 163
 164 static void mv_cesa_remove_algs(struct mv_cesa_dev *cesa)
 165 {
 166         int i;
 167
 168         for (i = 0; i < cesa->caps->nahash_algs; i++)
 169                 crypto_unregister_ahash(cesa->caps->ahash_algs[i]);
 170
 171         for (i = 0; i < cesa->caps->ncipher_algs; i++)
 172                 crypto_unregister_alg(cesa->caps->cipher_algs[i]);
 173 }
 174
 175 static struct crypto_alg *orion_cipher_algs[] = {
 176         &mv_cesa_ecb_des_alg,
 177         &mv_cesa_cbc_des_alg,
 178         &mv_cesa_ecb_des3_ede_alg,
 179         &mv_cesa_cbc_des3_ede_alg,
 180         &mv_cesa_ecb_aes_alg,
 181         &mv_cesa_cbc_aes_alg,
 182 };
 183
 184 static struct ahash_alg *orion_ahash_algs[] = {
 185         &mv_md5_alg,
 186         &mv_sha1_alg,
 187         &mv_ahmac_md5_alg,
 188         &mv_ahmac_sha1_alg,
 189 };
 190
 191 static struct crypto_alg *armada_370_cipher_algs[] = {
 192         &mv_cesa_ecb_des_alg,
 193         &mv_cesa_cbc_des_alg,
 194         &mv_cesa_ecb_des3_ede_alg,
 195         &mv_cesa_cbc_des3_ede_alg,
 196         &mv_cesa_ecb_aes_alg,
 197         &mv_cesa_cbc_aes_alg,
 198 };
 199
 200 static struct ahash_alg *armada_370_ahash_algs[] = {
 201         &mv_md5_alg,
 202         &mv_sha1_alg,
 203         &mv_sha256_alg,
 204         &mv_ahmac_md5_alg,
 205         &mv_ahmac_sha1_alg,
 206         &mv_ahmac_sha256_alg,
 207 };
 208
 209 static const struct mv_cesa_caps orion_caps = {
 210         .nengines = 1,
 211         .cipher_algs = orion_cipher_algs,
 212         .ncipher_algs = ARRAY_SIZE(orion_cipher_algs),
 213         .ahash_algs = orion_ahash_algs,
 214         .nahash_algs = ARRAY_SIZE(orion_ahash_algs),
 215         .has_tdma = false,
 216 };
 217
 218 static const struct mv_cesa_caps kirkwood_caps = {
 219         .nengines = 1,
 220         .cipher_algs = orion_cipher_algs,
 221         .ncipher_algs = ARRAY_SIZE(orion_cipher_algs),
 222         .ahash_algs = orion_ahash_algs,
 223         .nahash_algs = ARRAY_SIZE(orion_ahash_algs),
 224         .has_tdma = true,
 225 };
 226
 227 static const struct mv_cesa_caps armada_370_caps = {
 228         .nengines = 1,
 229         .cipher_algs = armada_370_cipher_algs,
 230         .ncipher_algs = ARRAY_SIZE(armada_370_cipher_algs),
 231         .ahash_algs = armada_370_ahash_algs,
 232         .nahash_algs = ARRAY_SIZE(armada_370_ahash_algs),
 233         .has_tdma = true,
 234 };
 235
 236 static const struct mv_cesa_caps armada_xp_caps = {
 237         .nengines = 2,
 238         .cipher_algs = armada_370_cipher_algs,
 239         .ncipher_algs = ARRAY_SIZE(armada_370_cipher_algs),
 240         .ahash_algs = armada_370_ahash_algs,
 241         .nahash_algs = ARRAY_SIZE(armada_370_ahash_algs),
 242         .has_tdma = true,
 243 };
 244
 245 static const struct of_device_id mv_cesa_of_match_table[] = {
 246         { .compatible = "marvell,orion-crypto", .data = &orion_caps },
 247         { .compatible = "marvell,kirkwood-crypto", .data = &kirkwood_caps },
 248         { .compatible = "marvell,dove-crypto", .data = &kirkwood_caps },
 249         { .compatible = "marvell,armada-370-crypto", .data = &armada_370_caps },
 250         { .compatible = "marvell,armada-xp-crypto", .data = &armada_xp_caps },
 251         { .compatible = "marvell,armada-375-crypto", .data = &armada_xp_caps },
 252         { .compatible = "marvell,armada-38x-crypto", .data = &armada_xp_caps },
 253         {}
 254 };
 255 MODULE_DEVICE_TABLE(of, mv_cesa_of_match_table);
 256
 257 static void
 258 mv_cesa_conf_mbus_windows(struct mv_cesa_engine *engine,
 259                           const struct mbus_dram_target_info *dram)
 260 {
 261         void __iomem *iobase = engine->regs;
 262         int i;
 263
 264         for (i = 0; i < 4; i++) {
 265                 writel(0, iobase + CESA_TDMA_WINDOW_CTRL(i));
 266                 writel(0, iobase + CESA_TDMA_WINDOW_BASE(i));
 267         }
 268
 269         for (i = 0; i < dram->num_cs; i++) {
 270                 const struct mbus_dram_window *cs = dram->cs + i;
 271
 272                 writel(((cs->size - 1) & 0xffff0000) |
 273                        (cs->mbus_attr << 8) |
 274                        (dram->mbus_dram_target_id << 4) | 1,
 275                        iobase + CESA_TDMA_WINDOW_CTRL(i));
 276                 writel(cs->base, iobase + CESA_TDMA_WINDOW_BASE(i));
 277         }
 278 }
 279
 280 static int mv_cesa_dev_dma_init(struct mv_cesa_dev *cesa)
 281 {
 282         struct device *dev = cesa->dev;
 283         struct mv_cesa_dev_dma *dma;
 284
 285         if (!cesa->caps->has_tdma)
 286                 return 0;
 287
 288         dma = devm_kzalloc(dev, sizeof(*dma), GFP_KERNEL);
 289         if (!dma)
 290                 return -ENOMEM;
 291
 292         dma->tdma_desc_pool = dmam_pool_create("tdma_desc", dev,
 293                                         sizeof(struct mv_cesa_tdma_desc),
 294                                         16, 0);
 295         if (!dma->tdma_desc_pool)
 296                 return -ENOMEM;
 297
 298         dma->op_pool = dmam_pool_create("cesa_op", dev,
 299                                         sizeof(struct mv_cesa_op_ctx), 16, 0);
 300         if (!dma->op_pool)
 301                 return -ENOMEM;
 302
 303         dma->cache_pool = dmam_pool_create("cesa_cache", dev,
 304                                            CESA_MAX_HASH_BLOCK_SIZE, 1, 0);
 305         if (!dma->cache_pool)
 306                 return -ENOMEM;
 307
 308         dma->padding_pool = dmam_pool_create("cesa_padding", dev, 72, 1, 0);
 309         if (!dma->padding_pool)
 310                 return -ENOMEM;
 311
 312         cesa->dma = dma;
 313
 314         return 0;
 315 }
 316
 317 static int mv_cesa_get_sram(struct platform_device *pdev, int idx)
 318 {
 319         struct mv_cesa_dev *cesa = platform_get_drvdata(pdev);
 320         struct mv_cesa_engine *engine = &cesa->engines[idx];
 321         const char *res_name = "sram";
 322         struct resource *res;
 323
 324         engine->pool = of_gen_pool_get(cesa->dev->of_node,
 325                                        "marvell,crypto-srams", idx);
 326         if (engine->pool) {
 327                 engine->sram = gen_pool_dma_alloc(engine->pool,
 328                                                   cesa->sram_size,
 329                                                   &engine->sram_dma);
 330                 if (engine->sram)
 331                         return 0;
 332
 333                 engine->pool = NULL;
 334                 return -ENOMEM;
 335         }
 336
 337         if (cesa->caps->nengines > 1) {
 338                 if (!idx)
 339                         res_name = "sram0";
 340                 else
 341                         res_name = "sram1";
 342         }
 343
 344         res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
 345                                            res_name);
 346         if (!res || resource_size(res) < cesa->sram_size)
 347                 return -EINVAL;
 348
 349         engine->sram = devm_ioremap_resource(cesa->dev, res);
 350         if (IS_ERR(engine->sram))
 351                 return PTR_ERR(engine->sram);
 352
 353         engine->sram_dma = phys_to_dma(cesa->dev,
 354                                        (phys_addr_t)res->start);
 355
 356         return 0;
 357 }
 358
 359 static void mv_cesa_put_sram(struct platform_device *pdev, int idx)
 360 {
 361         struct mv_cesa_dev *cesa = platform_get_drvdata(pdev);
 362         struct mv_cesa_engine *engine = &cesa->engines[idx];
 363
 364         if (!engine->pool)
 365                 return;
 366
 367         gen_pool_free(engine->pool, (unsigned long)engine->sram,
 368                       cesa->sram_size);
 369 }
 370
 371 static int mv_cesa_probe(struct platform_device *pdev)
 372 {
 373         const struct mv_cesa_caps *caps = &orion_caps;
 374         const struct mbus_dram_target_info *dram;
 375         const struct of_device_id *match;
 376         struct device *dev = &pdev->dev;
 377         struct mv_cesa_dev *cesa;
 378         struct mv_cesa_engine *engines;
 379         struct resource *res;
 380         int irq, ret, i;
 381         u32 sram_size;
 382
 383         if (cesa_dev) {
 384                 dev_err(&pdev->dev, "Only one CESA device authorized\n");
 385                 return -EEXIST;
 386         }
 387
 388         if (dev->of_node) {
 389                 match = of_match_node(mv_cesa_of_match_table, dev->of_node);
 390                 if (!match || !match->data)
 391                         return -ENOTSUPP;
 392
 393                 caps = match->data;
 394         }
 395
 396         if ((caps == &orion_caps || caps == &kirkwood_caps) && !allhwsupport)
 397                 return -ENOTSUPP;
 398
 399         cesa = devm_kzalloc(dev, sizeof(*cesa), GFP_KERNEL);
 400         if (!cesa)
 401                 return -ENOMEM;
 402
 403         cesa->caps = caps;
 404         cesa->dev = dev;
 405
 406         sram_size = CESA_SA_DEFAULT_SRAM_SIZE;
 407         of_property_read_u32(cesa->dev->of_node, "marvell,crypto-sram-size",
 408                              &sram_size);
 409         if (sram_size < CESA_SA_MIN_SRAM_SIZE)
 410                 sram_size = CESA_SA_MIN_SRAM_SIZE;
 411
 412         cesa->sram_size = sram_size;
 413         cesa->engines = devm_kzalloc(dev, caps->nengines * sizeof(*engines),
 414                                      GFP_KERNEL);
 415         if (!cesa->engines)
 416                 return -ENOMEM;
 417
 418         spin_lock_init(&cesa->lock);
 419         crypto_init_queue(&cesa->queue, 50);
 420         res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "regs");
 421         cesa->regs = devm_ioremap_resource(dev, res);
 422         if (IS_ERR(cesa->regs))
 423                 return PTR_ERR(cesa->regs);
 424
 425         ret = mv_cesa_dev_dma_init(cesa);
 426         if (ret)
 427                 return ret;
 428
 429         dram = mv_mbus_dram_info_nooverlap();
 430
 431         platform_set_drvdata(pdev, cesa);
 432
 433         for (i = 0; i < caps->nengines; i++) {
 434                 struct mv_cesa_engine *engine = &cesa->engines[i];
 435                 char res_name[7];
 436
 437                 engine->id = i;
 438                 spin_lock_init(&engine->lock);
 439
 440                 ret = mv_cesa_get_sram(pdev, i);
 441                 if (ret)
 442                         goto err_cleanup;
 443
 444                 irq = platform_get_irq(pdev, i);
 445                 if (irq < 0) {
 446                         ret = irq;
 447                         goto err_cleanup;
 448                 }
 449
 450                 /*
 451                  * Not all platforms can gate the CESA clocks: do not complain
 452                  * if the clock does not exist.
 453                  */
 454                 snprintf(res_name, sizeof(res_name), "cesa%d", i);
 455                 engine->clk = devm_clk_get(dev, res_name);
 456                 if (IS_ERR(engine->clk)) {
 457                         engine->clk = devm_clk_get(dev, NULL);
 458                         if (IS_ERR(engine->clk))
 459                                 engine->clk = NULL;
 460                 }
 461
 462                 snprintf(res_name, sizeof(res_name), "cesaz%d", i);
 463                 engine->zclk = devm_clk_get(dev, res_name);
 464                 if (IS_ERR(engine->zclk))
 465                         engine->zclk = NULL;
 466
 467                 ret = clk_prepare_enable(engine->clk);
 468                 if (ret)
 469                         goto err_cleanup;
 470
 471                 ret = clk_prepare_enable(engine->zclk);
 472                 if (ret)
 473                         goto err_cleanup;
 474
 475                 engine->regs = cesa->regs + CESA_ENGINE_OFF(i);
 476
 477                 if (dram && cesa->caps->has_tdma)
 478                         mv_cesa_conf_mbus_windows(&cesa->engines[i], dram);
 479
 480                 writel(0, cesa->engines[i].regs + CESA_SA_INT_STATUS);
 481                 writel(CESA_SA_CFG_STOP_DIG_ERR,
 482                        cesa->engines[i].regs + CESA_SA_CFG);
 483                 writel(engine->sram_dma & CESA_SA_SRAM_MSK,
 484                        cesa->engines[i].regs + CESA_SA_DESC_P0);
 485
 486                 ret = devm_request_threaded_irq(dev, irq, NULL, mv_cesa_int,
 487                                                 IRQF_ONESHOT,
 488                                                 dev_name(&pdev->dev),
 489                                                 &cesa->engines[i]);
 490                 if (ret)
 491                         goto err_cleanup;
 492         }
 493
 494         cesa_dev = cesa;
 495
 496         ret = mv_cesa_add_algs(cesa);
 497         if (ret) {
 498                 cesa_dev = NULL;
 499                 goto err_cleanup;
 500         }
 501
 502         dev_info(dev, "CESA device successfully registered\n");
 503
 504         return 0;
 505
 506 err_cleanup:
 507         for (i = 0; i < caps->nengines; i++) {
 508                 clk_disable_unprepare(cesa->engines[i].zclk);
 509                 clk_disable_unprepare(cesa->engines[i].clk);
 510                 mv_cesa_put_sram(pdev, i);
 511         }
 512
 513         return ret;
 514 }
 515
 516 static int mv_cesa_remove(struct platform_device *pdev)
 517 {
 518         struct mv_cesa_dev *cesa = platform_get_drvdata(pdev);
 519         int i;
 520
 521         mv_cesa_remove_algs(cesa);
 522
 523         for (i = 0; i < cesa->caps->nengines; i++) {
 524                 clk_disable_unprepare(cesa->engines[i].zclk);
 525                 clk_disable_unprepare(cesa->engines[i].clk);
 526                 mv_cesa_put_sram(pdev, i);
 527         }
 528
 529         return 0;
 530 }
 531
 532 static struct platform_driver marvell_cesa = {
 533         .probe          = mv_cesa_probe,
 534         .remove         = mv_cesa_remove,
 535         .driver         = {
 536                 .name   = "marvell-cesa",
 537                 .of_match_table = mv_cesa_of_match_table,
 538         },
 539 };
 540 module_platform_driver(marvell_cesa);
 541
 542 MODULE_ALIAS("platform:mv_crypto");
 543 MODULE_AUTHOR("Boris Brezillon <boris.brezillon@free-electrons.com>");
 544 MODULE_AUTHOR("Arnaud Ebalard <arno@natisbad.org>");
 545 MODULE_DESCRIPTION("Support for Marvell's cryptographic engine");
 546 MODULE_LICENSE("GPL v2");