drivers/crypto/rockchip/rk3288_crypto.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
  12 #include "rk3288_crypto.h"
  13 #include <linux/dma-mapping.h>
  14 #include <linux/module.h>
  15 #include <linux/platform_device.h>
  16 #include <linux/of.h>
  17 #include <linux/clk.h>
  18 #include <linux/crypto.h>
  19 #include <linux/reset.h>
  20
  21 static int rk_crypto_enable_clk(struct rk_crypto_info *dev)
  22 {
  23         int err;
  24
  25         err = clk_prepare_enable(dev->sclk);
  26         if (err) {
  27                 dev_err(dev->dev, "[%s:%d], Couldn't enable clock sclk\n",
  28                         __func__, __LINE__);
  29                 goto err_return;
  30         }
  31         err = clk_prepare_enable(dev->aclk);
  32         if (err) {
  33                 dev_err(dev->dev, "[%s:%d], Couldn't enable clock aclk\n",
  34                         __func__, __LINE__);
  35                 goto err_aclk;
  36         }
  37         err = clk_prepare_enable(dev->hclk);
  38         if (err) {
  39                 dev_err(dev->dev, "[%s:%d], Couldn't enable clock hclk\n",
  40                         __func__, __LINE__);
  41                 goto err_hclk;
  42         }
  43         err = clk_prepare_enable(dev->dmaclk);
  44         if (err) {
  45                 dev_err(dev->dev, "[%s:%d], Couldn't enable clock dmaclk\n",
  46                         __func__, __LINE__);
  47                 goto err_dmaclk;
  48         }
  49         return err;
  50 err_dmaclk:
  51         clk_disable_unprepare(dev->hclk);
  52 err_hclk:
  53         clk_disable_unprepare(dev->aclk);
  54 err_aclk:
  55         clk_disable_unprepare(dev->sclk);
  56 err_return:
  57         return err;
  58 }
  59
  60 static void rk_crypto_disable_clk(struct rk_crypto_info *dev)
  61 {
  62         clk_disable_unprepare(dev->dmaclk);
  63         clk_disable_unprepare(dev->hclk);
  64         clk_disable_unprepare(dev->aclk);
  65         clk_disable_unprepare(dev->sclk);
  66 }
  67
  68 static int check_alignment(struct scatterlist *sg_src,
  69                            struct scatterlist *sg_dst,
  70                            int align_mask)
  71 {
  72         int in, out, align;
  73
  74         in = IS_ALIGNED((uint32_t)sg_src->offset, 4) &&
  75              IS_ALIGNED((uint32_t)sg_src->length, align_mask);
  76         if (!sg_dst)
  77                 return in;
  78         out = IS_ALIGNED((uint32_t)sg_dst->offset, 4) &&
  79               IS_ALIGNED((uint32_t)sg_dst->length, align_mask);
  80         align = in && out;
  81
  82         return (align && (sg_src->length == sg_dst->length));
  83 }
  84
  85 static int rk_load_data(struct rk_crypto_info *dev,
  86                         struct scatterlist *sg_src,
  87                         struct scatterlist *sg_dst)
  88 {
  89         unsigned int count;
  90
  91         dev->aligned = dev->aligned ?
  92                 check_alignment(sg_src, sg_dst, dev->align_size) :
  93                 dev->aligned;
  94         if (dev->aligned) {
  95                 count = min(dev->left_bytes, sg_src->length);
  96                 dev->left_bytes -= count;
  97
  98                 if (!dma_map_sg(dev->dev, sg_src, 1, DMA_TO_DEVICE)) {
  99                         dev_err(dev->dev, "[%s:%d] dma_map_sg(src)  error\n",
 100                                 __func__, __LINE__);
 101                         return -EINVAL;
 102                 }
 103                 dev->addr_in = sg_dma_address(sg_src);
 104
 105                 if (sg_dst) {
 106                         if (!dma_map_sg(dev->dev, sg_dst, 1, DMA_FROM_DEVICE)) {
 107                                 dev_err(dev->dev,
 108                                         "[%s:%d] dma_map_sg(dst)  error\n",
 109                                         __func__, __LINE__);
 110                                 dma_unmap_sg(dev->dev, sg_src, 1,
 111                                              DMA_TO_DEVICE);
 112                                 return -EINVAL;
 113                         }
 114                         dev->addr_out = sg_dma_address(sg_dst);
 115                 }
 116         } else {
 117                 count = (dev->left_bytes > PAGE_SIZE) ?
 118                         PAGE_SIZE : dev->left_bytes;
 119
 120                 if (!sg_pcopy_to_buffer(dev->first, dev->src_nents,
 121                                         dev->addr_vir, count,
 122                                         dev->total - dev->left_bytes)) {
 123                         dev_err(dev->dev, "[%s:%d] pcopy err\n",
 124                                 __func__, __LINE__);
 125                         return -EINVAL;
 126                 }
 127                 dev->left_bytes -= count;
 128                 sg_init_one(&dev->sg_tmp, dev->addr_vir, count);
 129                 if (!dma_map_sg(dev->dev, &dev->sg_tmp, 1, DMA_TO_DEVICE)) {
 130                         dev_err(dev->dev, "[%s:%d] dma_map_sg(sg_tmp)  error\n",
 131                                 __func__, __LINE__);
 132                         return -ENOMEM;
 133                 }
 134                 dev->addr_in = sg_dma_address(&dev->sg_tmp);
 135
 136                 if (sg_dst) {
 137                         if (!dma_map_sg(dev->dev, &dev->sg_tmp, 1,
 138                                         DMA_FROM_DEVICE)) {
 139                                 dev_err(dev->dev,
 140                                         "[%s:%d] dma_map_sg(sg_tmp)  error\n",
 141                                         __func__, __LINE__);
 142                                 dma_unmap_sg(dev->dev, &dev->sg_tmp, 1,
 143                                              DMA_TO_DEVICE);
 144                                 return -ENOMEM;
 145                         }
 146                         dev->addr_out = sg_dma_address(&dev->sg_tmp);
 147                 }
 148         }
 149         dev->count = count;
 150         return 0;
 151 }
 152
 153 static void rk_unload_data(struct rk_crypto_info *dev)
 154 {
 155         struct scatterlist *sg_in, *sg_out;
 156
 157         sg_in = dev->aligned ? dev->sg_src : &dev->sg_tmp;
 158         dma_unmap_sg(dev->dev, sg_in, 1, DMA_TO_DEVICE);
 159
 160         if (dev->sg_dst) {
 161                 sg_out = dev->aligned ? dev->sg_dst : &dev->sg_tmp;
 162                 dma_unmap_sg(dev->dev, sg_out, 1, DMA_FROM_DEVICE);
 163         }
 164 }
 165
 166 static irqreturn_t rk_crypto_irq_handle(int irq, void *dev_id)
 167 {
 168         struct rk_crypto_info *dev  = platform_get_drvdata(dev_id);
 169         u32 interrupt_status;
 170
 171         spin_lock(&dev->lock);
 172         interrupt_status = CRYPTO_READ(dev, RK_CRYPTO_INTSTS);
 173         CRYPTO_WRITE(dev, RK_CRYPTO_INTSTS, interrupt_status);
 174
 175         if (interrupt_status & 0x0a) {
 176                 dev_warn(dev->dev, "DMA Error\n");
 177                 dev->err = -EFAULT;
 178         }
 179         tasklet_schedule(&dev->done_task);
 180
 181         spin_unlock(&dev->lock);
 182         return IRQ_HANDLED;
 183 }
 184
 185 static int rk_crypto_enqueue(struct rk_crypto_info *dev,
 186                               struct crypto_async_request *async_req)
 187 {
 188         unsigned long flags;
 189         int ret;
 190
 191         spin_lock_irqsave(&dev->lock, flags);
 192         ret = crypto_enqueue_request(&dev->queue, async_req);
 193         if (dev->busy) {
 194                 spin_unlock_irqrestore(&dev->lock, flags);
 195                 return ret;
 196         }
 197         dev->busy = true;
 198         spin_unlock_irqrestore(&dev->lock, flags);
 199         tasklet_schedule(&dev->queue_task);
 200
 201         return ret;
 202 }
 203
 204 static void rk_crypto_queue_task_cb(unsigned long data)
 205 {
 206         struct rk_crypto_info *dev = (struct rk_crypto_info *)data;
 207         struct crypto_async_request *async_req, *backlog;
 208         unsigned long flags;
 209         int err = 0;
 210
 211         dev->err = 0;
 212         spin_lock_irqsave(&dev->lock, flags);
 213         backlog   = crypto_get_backlog(&dev->queue);
 214         async_req = crypto_dequeue_request(&dev->queue);
 215
 216         if (!async_req) {
 217                 dev->busy = false;
 218                 spin_unlock_irqrestore(&dev->lock, flags);
 219                 return;
 220         }
 221         spin_unlock_irqrestore(&dev->lock, flags);
 222
 223         if (backlog) {
 224                 backlog->complete(backlog, -EINPROGRESS);
 225                 backlog = NULL;
 226         }
 227
 228         dev->async_req = async_req;
 229         err = dev->start(dev);
 230         if (err)
 231                 dev->complete(dev->async_req, err);
 232 }
 233
 234 static void rk_crypto_done_task_cb(unsigned long data)
 235 {
 236         struct rk_crypto_info *dev = (struct rk_crypto_info *)data;
 237
 238         if (dev->err) {
 239                 dev->complete(dev->async_req, dev->err);
 240                 return;
 241         }
 242
 243         dev->err = dev->update(dev);
 244         if (dev->err)
 245                 dev->complete(dev->async_req, dev->err);
 246 }
 247
 248 static struct rk_crypto_tmp *rk_cipher_algs[] = {
 249         &rk_ecb_aes_alg,
 250         &rk_cbc_aes_alg,
 251         &rk_ecb_des_alg,
 252         &rk_cbc_des_alg,
 253         &rk_ecb_des3_ede_alg,
 254         &rk_cbc_des3_ede_alg,
 255         &rk_ahash_sha1,
 256         &rk_ahash_sha256,
 257         &rk_ahash_md5,
 258 };
 259
 260 static int rk_crypto_register(struct rk_crypto_info *crypto_info)
 261 {
 262         unsigned int i, k;
 263         int err = 0;
 264
 265         for (i = 0; i < ARRAY_SIZE(rk_cipher_algs); i++) {
 266                 rk_cipher_algs[i]->dev = crypto_info;
 267                 if (rk_cipher_algs[i]->type == ALG_TYPE_CIPHER)
 268                         err = crypto_register_skcipher(
 269                                         &rk_cipher_algs[i]->alg.skcipher);
 270                 else
 271                         err = crypto_register_ahash(
 272                                         &rk_cipher_algs[i]->alg.hash);
 273                 if (err)
 274                         goto err_cipher_algs;
 275         }
 276         return 0;
 277
 278 err_cipher_algs:
 279         for (k = 0; k < i; k++) {
 280                 if (rk_cipher_algs[i]->type == ALG_TYPE_CIPHER)
 281                         crypto_unregister_skcipher(&rk_cipher_algs[k]->alg.skcipher);
 282                 else
 283                         crypto_unregister_ahash(&rk_cipher_algs[i]->alg.hash);
 284         }
 285         return err;
 286 }
 287
 288 static void rk_crypto_unregister(void)
 289 {
 290         unsigned int i;
 291
 292         for (i = 0; i < ARRAY_SIZE(rk_cipher_algs); i++) {
 293                 if (rk_cipher_algs[i]->type == ALG_TYPE_CIPHER)
 294                         crypto_unregister_skcipher(&rk_cipher_algs[i]->alg.skcipher);
 295                 else
 296                         crypto_unregister_ahash(&rk_cipher_algs[i]->alg.hash);
 297         }
 298 }
 299
 300 static void rk_crypto_action(void *data)
 301 {
 302         struct rk_crypto_info *crypto_info = data;
 303
 304         reset_control_assert(crypto_info->rst);
 305 }
 306
 307 static const struct of_device_id crypto_of_id_table[] = {
 308         { .compatible = "rockchip,rk3288-crypto" },
 309         {}
 310 };
 311 MODULE_DEVICE_TABLE(of, crypto_of_id_table);
 312
 313 static int rk_crypto_probe(struct platform_device *pdev)
 314 {
 315         struct device *dev = &pdev->dev;
 316         struct rk_crypto_info *crypto_info;
 317         int err = 0;
 318
 319         crypto_info = devm_kzalloc(&pdev->dev,
 320                                    sizeof(*crypto_info), GFP_KERNEL);
 321         if (!crypto_info) {
 322                 err = -ENOMEM;
 323                 goto err_crypto;
 324         }
 325
 326         crypto_info->rst = devm_reset_control_get(dev, "crypto-rst");
 327         if (IS_ERR(crypto_info->rst)) {
 328                 err = PTR_ERR(crypto_info->rst);
 329                 goto err_crypto;
 330         }
 331
 332         reset_control_assert(crypto_info->rst);
 333         usleep_range(10, 20);
 334         reset_control_deassert(crypto_info->rst);
 335
 336         err = devm_add_action_or_reset(dev, rk_crypto_action, crypto_info);
 337         if (err)
 338                 goto err_crypto;
 339
 340         spin_lock_init(&crypto_info->lock);
 341
 342         crypto_info->reg = devm_platform_ioremap_resource(pdev, 0);
 343         if (IS_ERR(crypto_info->reg)) {
 344                 err = PTR_ERR(crypto_info->reg);
 345                 goto err_crypto;
 346         }
 347
 348         crypto_info->aclk = devm_clk_get(&pdev->dev, "aclk");
 349         if (IS_ERR(crypto_info->aclk)) {
 350                 err = PTR_ERR(crypto_info->aclk);
 351                 goto err_crypto;
 352         }
 353
 354         crypto_info->hclk = devm_clk_get(&pdev->dev, "hclk");
 355         if (IS_ERR(crypto_info->hclk)) {
 356                 err = PTR_ERR(crypto_info->hclk);
 357                 goto err_crypto;
 358         }
 359
 360         crypto_info->sclk = devm_clk_get(&pdev->dev, "sclk");
 361         if (IS_ERR(crypto_info->sclk)) {
 362                 err = PTR_ERR(crypto_info->sclk);
 363                 goto err_crypto;
 364         }
 365
 366         crypto_info->dmaclk = devm_clk_get(&pdev->dev, "apb_pclk");
 367         if (IS_ERR(crypto_info->dmaclk)) {
 368                 err = PTR_ERR(crypto_info->dmaclk);
 369                 goto err_crypto;
 370         }
 371
 372         crypto_info->irq = platform_get_irq(pdev, 0);
 373         if (crypto_info->irq < 0) {
 374                 dev_warn(crypto_info->dev,
 375                          "control Interrupt is not available.\n");
 376                 err = crypto_info->irq;
 377                 goto err_crypto;
 378         }
 379
 380         err = devm_request_irq(&pdev->dev, crypto_info->irq,
 381                                rk_crypto_irq_handle, IRQF_SHARED,
 382                                "rk-crypto", pdev);
 383
 384         if (err) {
 385                 dev_err(crypto_info->dev, "irq request failed.\n");
 386                 goto err_crypto;
 387         }
 388
 389         crypto_info->dev = &pdev->dev;
 390         platform_set_drvdata(pdev, crypto_info);
 391
 392         tasklet_init(&crypto_info->queue_task,
 393                      rk_crypto_queue_task_cb, (unsigned long)crypto_info);
 394         tasklet_init(&crypto_info->done_task,
 395                      rk_crypto_done_task_cb, (unsigned long)crypto_info);
 396         crypto_init_queue(&crypto_info->queue, 50);
 397
 398         crypto_info->enable_clk = rk_crypto_enable_clk;
 399         crypto_info->disable_clk = rk_crypto_disable_clk;
 400         crypto_info->load_data = rk_load_data;
 401         crypto_info->unload_data = rk_unload_data;
 402         crypto_info->enqueue = rk_crypto_enqueue;
 403         crypto_info->busy = false;
 404
 405         err = rk_crypto_register(crypto_info);
 406         if (err) {
 407                 dev_err(dev, "err in register alg");
 408                 goto err_register_alg;
 409         }
 410
 411         dev_info(dev, "Crypto Accelerator successfully registered\n");
 412         return 0;
 413
 414 err_register_alg:
 415         tasklet_kill(&crypto_info->queue_task);
 416         tasklet_kill(&crypto_info->done_task);
 417 err_crypto:
 418         return err;
 419 }
 420
 421 static int rk_crypto_remove(struct platform_device *pdev)
 422 {
 423         struct rk_crypto_info *crypto_tmp = platform_get_drvdata(pdev);
 424
 425         rk_crypto_unregister();
 426         tasklet_kill(&crypto_tmp->done_task);
 427         tasklet_kill(&crypto_tmp->queue_task);
 428         return 0;
 429 }
 430
 431 static struct platform_driver crypto_driver = {
 432         .probe          = rk_crypto_probe,
 433         .remove         = rk_crypto_remove,
 434         .driver         = {
 435                 .name   = "rk3288-crypto",
 436                 .of_match_table = crypto_of_id_table,
 437         },
 438 };
 439
 440 module_platform_driver(crypto_driver);
 441
 442 MODULE_AUTHOR("Zain Wang <zain.wang@rock-chips.com>");
 443 MODULE_DESCRIPTION("Support for Rockchip's cryptographic engine");
 444 MODULE_LICENSE("GPL");