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 <crypto/engine.h>
  14 #include <crypto/internal/hash.h>
  15 #include <crypto/internal/skcipher.h>
  16 #include <linux/clk.h>
  17 #include <linux/dma-mapping.h>
  18 #include <linux/debugfs.h>
  19 #include <linux/delay.h>
  20 #include <linux/err.h>
  21 #include <linux/kernel.h>
  22 #include <linux/io.h>
  23 #include <linux/module.h>
  24 #include <linux/platform_device.h>
  25 #include <linux/of.h>
  26 #include <linux/reset.h>
  27 #include <linux/spinlock.h>
  28
  29 static struct rockchip_ip rocklist = {
  30         .dev_list = LIST_HEAD_INIT(rocklist.dev_list),
  31         .lock = __SPIN_LOCK_UNLOCKED(rocklist.lock),
  32 };
  33
  34 struct rk_crypto_info *get_rk_crypto(void)
  35 {
  36         struct rk_crypto_info *first;
  37
  38         spin_lock(&rocklist.lock);
  39         first = list_first_entry_or_null(&rocklist.dev_list,
  40                                          struct rk_crypto_info, list);
  41         list_rotate_left(&rocklist.dev_list);
  42         spin_unlock(&rocklist.lock);
  43         return first;
  44 }
  45
  46 static const struct rk_variant rk3288_variant = {
  47         .num_clks = 4,
  48         .rkclks = {
  49                 { "sclk", 150000000},
  50         }
  51 };
  52
  53 static const struct rk_variant rk3328_variant = {
  54         .num_clks = 3,
  55 };
  56
  57 static const struct rk_variant rk3399_variant = {
  58         .num_clks = 3,
  59 };
  60
  61 static int rk_crypto_get_clks(struct rk_crypto_info *dev)
  62 {
  63         int i, j, err;
  64         unsigned long cr;
  65
  66         dev->num_clks = devm_clk_bulk_get_all(dev->dev, &dev->clks);
  67         if (dev->num_clks < dev->variant->num_clks) {
  68                 dev_err(dev->dev, "Missing clocks, got %d instead of %d\n",
  69                         dev->num_clks, dev->variant->num_clks);
  70                 return -EINVAL;
  71         }
  72
  73         for (i = 0; i < dev->num_clks; i++) {
  74                 cr = clk_get_rate(dev->clks[i].clk);
  75                 for (j = 0; j < ARRAY_SIZE(dev->variant->rkclks); j++) {
  76                         if (dev->variant->rkclks[j].max == 0)
  77                                 continue;
  78                         if (strcmp(dev->variant->rkclks[j].name, dev->clks[i].id))
  79                                 continue;
  80                         if (cr > dev->variant->rkclks[j].max) {
  81                                 err = clk_set_rate(dev->clks[i].clk,
  82                                                    dev->variant->rkclks[j].max);
  83                                 if (err)
  84                                         dev_err(dev->dev, "Fail downclocking %s from %lu to %lu\n",
  85                                                 dev->variant->rkclks[j].name, cr,
  86                                                 dev->variant->rkclks[j].max);
  87                                 else
  88                                         dev_info(dev->dev, "Downclocking %s from %lu to %lu\n",
  89                                                  dev->variant->rkclks[j].name, cr,
  90                                                  dev->variant->rkclks[j].max);
  91                         }
  92                 }
  93         }
  94         return 0;
  95 }
  96
  97 static int rk_crypto_enable_clk(struct rk_crypto_info *dev)
  98 {
  99         int err;
 100
 101         err = clk_bulk_prepare_enable(dev->num_clks, dev->clks);
 102         if (err)
 103                 dev_err(dev->dev, "Could not enable clock clks\n");
 104
 105         return err;
 106 }
 107
 108 static void rk_crypto_disable_clk(struct rk_crypto_info *dev)
 109 {
 110         clk_bulk_disable_unprepare(dev->num_clks, dev->clks);
 111 }
 112
 113 /*
 114  * Power management strategy: The device is suspended until a request
 115  * is handled. For avoiding suspend/resume yoyo, the autosuspend is set to 2s.
 116  */
 117 static int rk_crypto_pm_suspend(struct device *dev)
 118 {
 119         struct rk_crypto_info *rkdev = dev_get_drvdata(dev);
 120
 121         rk_crypto_disable_clk(rkdev);
 122         reset_control_assert(rkdev->rst);
 123
 124         return 0;
 125 }
 126
 127 static int rk_crypto_pm_resume(struct device *dev)
 128 {
 129         struct rk_crypto_info *rkdev = dev_get_drvdata(dev);
 130         int ret;
 131
 132         ret = rk_crypto_enable_clk(rkdev);
 133         if (ret)
 134                 return ret;
 135
 136         reset_control_deassert(rkdev->rst);
 137         return 0;
 138
 139 }
 140
 141 static const struct dev_pm_ops rk_crypto_pm_ops = {
 142         SET_RUNTIME_PM_OPS(rk_crypto_pm_suspend, rk_crypto_pm_resume, NULL)
 143 };
 144
 145 static int rk_crypto_pm_init(struct rk_crypto_info *rkdev)
 146 {
 147         int err;
 148
 149         pm_runtime_use_autosuspend(rkdev->dev);
 150         pm_runtime_set_autosuspend_delay(rkdev->dev, 2000);
 151
 152         err = pm_runtime_set_suspended(rkdev->dev);
 153         if (err)
 154                 return err;
 155         pm_runtime_enable(rkdev->dev);
 156         return err;
 157 }
 158
 159 static void rk_crypto_pm_exit(struct rk_crypto_info *rkdev)
 160 {
 161         pm_runtime_disable(rkdev->dev);
 162 }
 163
 164 static irqreturn_t rk_crypto_irq_handle(int irq, void *dev_id)
 165 {
 166         struct rk_crypto_info *dev  = platform_get_drvdata(dev_id);
 167         u32 interrupt_status;
 168
 169         interrupt_status = CRYPTO_READ(dev, RK_CRYPTO_INTSTS);
 170         CRYPTO_WRITE(dev, RK_CRYPTO_INTSTS, interrupt_status);
 171
 172         dev->status = 1;
 173         if (interrupt_status & 0x0a) {
 174                 dev_warn(dev->dev, "DMA Error\n");
 175                 dev->status = 0;
 176         }
 177         complete(&dev->complete);
 178
 179         return IRQ_HANDLED;
 180 }
 181
 182 static struct rk_crypto_tmp *rk_cipher_algs[] = {
 183         &rk_ecb_aes_alg,
 184         &rk_cbc_aes_alg,
 185         &rk_ecb_des_alg,
 186         &rk_cbc_des_alg,
 187         &rk_ecb_des3_ede_alg,
 188         &rk_cbc_des3_ede_alg,
 189         &rk_ahash_sha1,
 190         &rk_ahash_sha256,
 191         &rk_ahash_md5,
 192 };
 193
 194 static int rk_crypto_debugfs_show(struct seq_file *seq, void *v)
 195 {
 196         struct rk_crypto_info *dd;
 197         unsigned int i;
 198
 199         spin_lock(&rocklist.lock);
 200         list_for_each_entry(dd, &rocklist.dev_list, list) {
 201                 seq_printf(seq, "%s %s requests: %lu\n",
 202                            dev_driver_string(dd->dev), dev_name(dd->dev),
 203                            dd->nreq);
 204         }
 205         spin_unlock(&rocklist.lock);
 206
 207         for (i = 0; i < ARRAY_SIZE(rk_cipher_algs); i++) {
 208                 if (!rk_cipher_algs[i]->dev)
 209                         continue;
 210                 switch (rk_cipher_algs[i]->type) {
 211                 case CRYPTO_ALG_TYPE_SKCIPHER:
 212                         seq_printf(seq, "%s %s reqs=%lu fallback=%lu\n",
 213                                    rk_cipher_algs[i]->alg.skcipher.base.base.cra_driver_name,
 214                                    rk_cipher_algs[i]->alg.skcipher.base.base.cra_name,
 215                                    rk_cipher_algs[i]->stat_req, rk_cipher_algs[i]->stat_fb);
 216                         seq_printf(seq, "\tfallback due to length: %lu\n",
 217                                    rk_cipher_algs[i]->stat_fb_len);
 218                         seq_printf(seq, "\tfallback due to alignment: %lu\n",
 219                                    rk_cipher_algs[i]->stat_fb_align);
 220                         seq_printf(seq, "\tfallback due to SGs: %lu\n",
 221                                    rk_cipher_algs[i]->stat_fb_sgdiff);
 222                         break;
 223                 case CRYPTO_ALG_TYPE_AHASH:
 224                         seq_printf(seq, "%s %s reqs=%lu fallback=%lu\n",
 225                                    rk_cipher_algs[i]->alg.hash.base.halg.base.cra_driver_name,
 226                                    rk_cipher_algs[i]->alg.hash.base.halg.base.cra_name,
 227                                    rk_cipher_algs[i]->stat_req, rk_cipher_algs[i]->stat_fb);
 228                         break;
 229                 }
 230         }
 231         return 0;
 232 }
 233
 234 DEFINE_SHOW_ATTRIBUTE(rk_crypto_debugfs);
 235
 236 static void register_debugfs(struct rk_crypto_info *crypto_info)
 237 {
 238         struct dentry *dbgfs_dir __maybe_unused;
 239         struct dentry *dbgfs_stats __maybe_unused;
 240
 241         /* Ignore error of debugfs */
 242         dbgfs_dir = debugfs_create_dir("rk3288_crypto", NULL);
 243         dbgfs_stats = debugfs_create_file("stats", 0444, dbgfs_dir, &rocklist,
 244                                           &rk_crypto_debugfs_fops);
 245
 246 #ifdef CONFIG_CRYPTO_DEV_ROCKCHIP_DEBUG
 247         rocklist.dbgfs_dir = dbgfs_dir;
 248         rocklist.dbgfs_stats = dbgfs_stats;
 249 #endif
 250 }
 251
 252 static int rk_crypto_register(struct rk_crypto_info *crypto_info)
 253 {
 254         unsigned int i, k;
 255         int err = 0;
 256
 257         for (i = 0; i < ARRAY_SIZE(rk_cipher_algs); i++) {
 258                 rk_cipher_algs[i]->dev = crypto_info;
 259                 switch (rk_cipher_algs[i]->type) {
 260                 case CRYPTO_ALG_TYPE_SKCIPHER:
 261                         dev_info(crypto_info->dev, "Register %s as %s\n",
 262                                  rk_cipher_algs[i]->alg.skcipher.base.base.cra_name,
 263                                  rk_cipher_algs[i]->alg.skcipher.base.base.cra_driver_name);
 264                         err = crypto_engine_register_skcipher(&rk_cipher_algs[i]->alg.skcipher);
 265                         break;
 266                 case CRYPTO_ALG_TYPE_AHASH:
 267                         dev_info(crypto_info->dev, "Register %s as %s\n",
 268                                  rk_cipher_algs[i]->alg.hash.base.halg.base.cra_name,
 269                                  rk_cipher_algs[i]->alg.hash.base.halg.base.cra_driver_name);
 270                         err = crypto_engine_register_ahash(&rk_cipher_algs[i]->alg.hash);
 271                         break;
 272                 default:
 273                         dev_err(crypto_info->dev, "unknown algorithm\n");
 274                 }
 275                 if (err)
 276                         goto err_cipher_algs;
 277         }
 278         return 0;
 279
 280 err_cipher_algs:
 281         for (k = 0; k < i; k++) {
 282                 if (rk_cipher_algs[i]->type == CRYPTO_ALG_TYPE_SKCIPHER)
 283                         crypto_engine_unregister_skcipher(&rk_cipher_algs[k]->alg.skcipher);
 284                 else
 285                         crypto_engine_unregister_ahash(&rk_cipher_algs[i]->alg.hash);
 286         }
 287         return err;
 288 }
 289
 290 static void rk_crypto_unregister(void)
 291 {
 292         unsigned int i;
 293
 294         for (i = 0; i < ARRAY_SIZE(rk_cipher_algs); i++) {
 295                 if (rk_cipher_algs[i]->type == CRYPTO_ALG_TYPE_SKCIPHER)
 296                         crypto_engine_unregister_skcipher(&rk_cipher_algs[i]->alg.skcipher);
 297                 else
 298                         crypto_engine_unregister_ahash(&rk_cipher_algs[i]->alg.hash);
 299         }
 300 }
 301
 302 static const struct of_device_id crypto_of_id_table[] = {
 303         { .compatible = "rockchip,rk3288-crypto",
 304           .data = &rk3288_variant,
 305         },
 306         { .compatible = "rockchip,rk3328-crypto",
 307           .data = &rk3328_variant,
 308         },
 309         { .compatible = "rockchip,rk3399-crypto",
 310           .data = &rk3399_variant,
 311         },
 312         {}
 313 };
 314 MODULE_DEVICE_TABLE(of, crypto_of_id_table);
 315
 316 static int rk_crypto_probe(struct platform_device *pdev)
 317 {
 318         struct device *dev = &pdev->dev;
 319         struct rk_crypto_info *crypto_info, *first;
 320         int err = 0;
 321
 322         crypto_info = devm_kzalloc(&pdev->dev,
 323                                    sizeof(*crypto_info), GFP_KERNEL);
 324         if (!crypto_info) {
 325                 err = -ENOMEM;
 326                 goto err_crypto;
 327         }
 328
 329         crypto_info->dev = &pdev->dev;
 330         platform_set_drvdata(pdev, crypto_info);
 331
 332         crypto_info->variant = of_device_get_match_data(&pdev->dev);
 333         if (!crypto_info->variant) {
 334                 dev_err(&pdev->dev, "Missing variant\n");
 335                 return -EINVAL;
 336         }
 337
 338         crypto_info->rst = devm_reset_control_array_get_exclusive(dev);
 339         if (IS_ERR(crypto_info->rst)) {
 340                 err = PTR_ERR(crypto_info->rst);
 341                 goto err_crypto;
 342         }
 343
 344         reset_control_assert(crypto_info->rst);
 345         usleep_range(10, 20);
 346         reset_control_deassert(crypto_info->rst);
 347
 348         crypto_info->reg = devm_platform_ioremap_resource(pdev, 0);
 349         if (IS_ERR(crypto_info->reg)) {
 350                 err = PTR_ERR(crypto_info->reg);
 351                 goto err_crypto;
 352         }
 353
 354         err = rk_crypto_get_clks(crypto_info);
 355         if (err)
 356                 goto err_crypto;
 357
 358         crypto_info->irq = platform_get_irq(pdev, 0);
 359         if (crypto_info->irq < 0) {
 360                 err = crypto_info->irq;
 361                 goto err_crypto;
 362         }
 363
 364         err = devm_request_irq(&pdev->dev, crypto_info->irq,
 365                                rk_crypto_irq_handle, IRQF_SHARED,
 366                                "rk-crypto", pdev);
 367
 368         if (err) {
 369                 dev_err(&pdev->dev, "irq request failed.\n");
 370                 goto err_crypto;
 371         }
 372
 373         crypto_info->engine = crypto_engine_alloc_init(&pdev->dev, true);
 374         crypto_engine_start(crypto_info->engine);
 375         init_completion(&crypto_info->complete);
 376
 377         err = rk_crypto_pm_init(crypto_info);
 378         if (err)
 379                 goto err_pm;
 380
 381         spin_lock(&rocklist.lock);
 382         first = list_first_entry_or_null(&rocklist.dev_list,
 383                                          struct rk_crypto_info, list);
 384         list_add_tail(&crypto_info->list, &rocklist.dev_list);
 385         spin_unlock(&rocklist.lock);
 386
 387         if (!first) {
 388                 err = rk_crypto_register(crypto_info);
 389                 if (err) {
 390                         dev_err(dev, "Fail to register crypto algorithms");
 391                         goto err_register_alg;
 392                 }
 393
 394                 register_debugfs(crypto_info);
 395         }
 396
 397         return 0;
 398
 399 err_register_alg:
 400         rk_crypto_pm_exit(crypto_info);
 401 err_pm:
 402         crypto_engine_exit(crypto_info->engine);
 403 err_crypto:
 404         dev_err(dev, "Crypto Accelerator not successfully registered\n");
 405         return err;
 406 }
 407
 408 static void rk_crypto_remove(struct platform_device *pdev)
 409 {
 410         struct rk_crypto_info *crypto_tmp = platform_get_drvdata(pdev);
 411         struct rk_crypto_info *first;
 412
 413         spin_lock_bh(&rocklist.lock);
 414         list_del(&crypto_tmp->list);
 415         first = list_first_entry_or_null(&rocklist.dev_list,
 416                                          struct rk_crypto_info, list);
 417         spin_unlock_bh(&rocklist.lock);
 418
 419         if (!first) {
 420 #ifdef CONFIG_CRYPTO_DEV_ROCKCHIP_DEBUG
 421                 debugfs_remove_recursive(rocklist.dbgfs_dir);
 422 #endif
 423                 rk_crypto_unregister();
 424         }
 425         rk_crypto_pm_exit(crypto_tmp);
 426         crypto_engine_exit(crypto_tmp->engine);
 427 }
 428
 429 static struct platform_driver crypto_driver = {
 430         .probe          = rk_crypto_probe,
 431         .remove_new     = rk_crypto_remove,
 432         .driver         = {
 433                 .name   = "rk3288-crypto",
 434                 .pm             = &rk_crypto_pm_ops,
 435                 .of_match_table = crypto_of_id_table,
 436         },
 437 };
 438
 439 module_platform_driver(crypto_driver);
 440
 441 MODULE_AUTHOR("Zain Wang <zain.wang@rock-chips.com>");
 442 MODULE_DESCRIPTION("Support for Rockchip's cryptographic engine");
 443 MODULE_LICENSE("GPL");