drivers/crypto/caam/ctrl.c

   1 /* * CAAM control-plane driver backend
   2  * Controller-level driver, kernel property detection, initialization
   3  *
   4  * Copyright 2008-2012 Freescale Semiconductor, Inc.
   5  */
   6
   7 #include <linux/device.h>
   8 #include <linux/of_address.h>
   9 #include <linux/of_irq.h>
  10
  11 #include "compat.h"
  12 #include "regs.h"
  13 #include "intern.h"
  14 #include "jr.h"
  15 #include "desc_constr.h"
  16 #include "error.h"
  17
  18 /*
  19  * i.MX targets tend to have clock control subsystems that can
  20  * enable/disable clocking to our device.
  21  */
  22 #ifdef CONFIG_CRYPTO_DEV_FSL_CAAM_IMX
  23 static inline struct clk *caam_drv_identify_clk(struct device *dev,
  24                                                 char *clk_name)
  25 {
  26         return devm_clk_get(dev, clk_name);
  27 }
  28 #else
  29 static inline struct clk *caam_drv_identify_clk(struct device *dev,
  30                                                 char *clk_name)
  31 {
  32         return NULL;
  33 }
  34 #endif
  35
  36 /*
  37  * Descriptor to instantiate RNG State Handle 0 in normal mode and
  38  * load the JDKEK, TDKEK and TDSK registers
  39  */
  40 static void build_instantiation_desc(u32 *desc, int handle, int do_sk)
  41 {
  42         u32 *jump_cmd, op_flags;
  43
  44         init_job_desc(desc, 0);
  45
  46         op_flags = OP_TYPE_CLASS1_ALG | OP_ALG_ALGSEL_RNG |
  47                         (handle << OP_ALG_AAI_SHIFT) | OP_ALG_AS_INIT;
  48
  49         /* INIT RNG in non-test mode */
  50         append_operation(desc, op_flags);
  51
  52         if (!handle && do_sk) {
  53                 /*
  54                  * For SH0, Secure Keys must be generated as well
  55                  */
  56
  57                 /* wait for done */
  58                 jump_cmd = append_jump(desc, JUMP_CLASS_CLASS1);
  59                 set_jump_tgt_here(desc, jump_cmd);
  60
  61                 /*
  62                  * load 1 to clear written reg:
  63                  * resets the done interrrupt and returns the RNG to idle.
  64                  */
  65                 append_load_imm_u32(desc, 1, LDST_SRCDST_WORD_CLRW);
  66
  67                 /* Initialize State Handle  */
  68                 append_operation(desc, OP_TYPE_CLASS1_ALG | OP_ALG_ALGSEL_RNG |
  69                                  OP_ALG_AAI_RNG4_SK);
  70         }
  71
  72         append_jump(desc, JUMP_CLASS_CLASS1 | JUMP_TYPE_HALT);
  73 }
  74
  75 /* Descriptor for deinstantiation of State Handle 0 of the RNG block. */
  76 static void build_deinstantiation_desc(u32 *desc, int handle)
  77 {
  78         init_job_desc(desc, 0);
  79
  80         /* Uninstantiate State Handle 0 */
  81         append_operation(desc, OP_TYPE_CLASS1_ALG | OP_ALG_ALGSEL_RNG |
  82                          (handle << OP_ALG_AAI_SHIFT) | OP_ALG_AS_INITFINAL);
  83
  84         append_jump(desc, JUMP_CLASS_CLASS1 | JUMP_TYPE_HALT);
  85 }
  86
  87 /*
  88  * run_descriptor_deco0 - runs a descriptor on DECO0, under direct control of
  89  *                        the software (no JR/QI used).
  90  * @ctrldev - pointer to device
  91  * @status - descriptor status, after being run
  92  *
  93  * Return: - 0 if no error occurred
  94  *         - -ENODEV if the DECO couldn't be acquired
  95  *         - -EAGAIN if an error occurred while executing the descriptor
  96  */
  97 static inline int run_descriptor_deco0(struct device *ctrldev, u32 *desc,
  98                                         u32 *status)
  99 {
 100         struct caam_drv_private *ctrlpriv = dev_get_drvdata(ctrldev);
 101         struct caam_ctrl __iomem *ctrl = ctrlpriv->ctrl;
 102         struct caam_deco __iomem *deco = ctrlpriv->deco;
 103         unsigned int timeout = 100000;
 104         u32 deco_dbg_reg, flags;
 105         int i;
 106
 107
 108         if (ctrlpriv->virt_en == 1) {
 109                 setbits32(&ctrl->deco_rsr, DECORSR_JR0);
 110
 111                 while (!(rd_reg32(&ctrl->deco_rsr) & DECORSR_VALID) &&
 112                        --timeout)
 113                         cpu_relax();
 114
 115                 timeout = 100000;
 116         }
 117
 118         setbits32(&ctrl->deco_rq, DECORR_RQD0ENABLE);
 119
 120         while (!(rd_reg32(&ctrl->deco_rq) & DECORR_DEN0) &&
 121                                                                  --timeout)
 122                 cpu_relax();
 123
 124         if (!timeout) {
 125                 dev_err(ctrldev, "failed to acquire DECO 0\n");
 126                 clrbits32(&ctrl->deco_rq, DECORR_RQD0ENABLE);
 127                 return -ENODEV;
 128         }
 129
 130         for (i = 0; i < desc_len(desc); i++)
 131                 wr_reg32(&deco->descbuf[i], *(desc + i));
 132
 133         flags = DECO_JQCR_WHL;
 134         /*
 135          * If the descriptor length is longer than 4 words, then the
 136          * FOUR bit in JRCTRL register must be set.
 137          */
 138         if (desc_len(desc) >= 4)
 139                 flags |= DECO_JQCR_FOUR;
 140
 141         /* Instruct the DECO to execute it */
 142         setbits32(&deco->jr_ctl_hi, flags);
 143
 144         timeout = 10000000;
 145         do {
 146                 deco_dbg_reg = rd_reg32(&deco->desc_dbg);
 147                 /*
 148                  * If an error occured in the descriptor, then
 149                  * the DECO status field will be set to 0x0D
 150                  */
 151                 if ((deco_dbg_reg & DESC_DBG_DECO_STAT_MASK) ==
 152                     DESC_DBG_DECO_STAT_HOST_ERR)
 153                         break;
 154                 cpu_relax();
 155         } while ((deco_dbg_reg & DESC_DBG_DECO_STAT_VALID) && --timeout);
 156
 157         *status = rd_reg32(&deco->op_status_hi) &
 158                   DECO_OP_STATUS_HI_ERR_MASK;
 159
 160         if (ctrlpriv->virt_en == 1)
 161                 clrbits32(&ctrl->deco_rsr, DECORSR_JR0);
 162
 163         /* Mark the DECO as free */
 164         clrbits32(&ctrl->deco_rq, DECORR_RQD0ENABLE);
 165
 166         if (!timeout)
 167                 return -EAGAIN;
 168
 169         return 0;
 170 }
 171
 172 /*
 173  * instantiate_rng - builds and executes a descriptor on DECO0,
 174  *                   which initializes the RNG block.
 175  * @ctrldev - pointer to device
 176  * @state_handle_mask - bitmask containing the instantiation status
 177  *                      for the RNG4 state handles which exist in
 178  *                      the RNG4 block: 1 if it's been instantiated
 179  *                      by an external entry, 0 otherwise.
 180  * @gen_sk  - generate data to be loaded into the JDKEK, TDKEK and TDSK;
 181  *            Caution: this can be done only once; if the keys need to be
 182  *            regenerated, a POR is required
 183  *
 184  * Return: - 0 if no error occurred
 185  *         - -ENOMEM if there isn't enough memory to allocate the descriptor
 186  *         - -ENODEV if DECO0 couldn't be acquired
 187  *         - -EAGAIN if an error occurred when executing the descriptor
 188  *            f.i. there was a RNG hardware error due to not "good enough"
 189  *            entropy being aquired.
 190  */
 191 static int instantiate_rng(struct device *ctrldev, int state_handle_mask,
 192                            int gen_sk)
 193 {
 194         struct caam_drv_private *ctrlpriv = dev_get_drvdata(ctrldev);
 195         struct caam_ctrl __iomem *ctrl;
 196         u32 *desc, status = 0, rdsta_val;
 197         int ret = 0, sh_idx;
 198
 199         ctrl = (struct caam_ctrl __iomem *)ctrlpriv->ctrl;
 200         desc = kmalloc(CAAM_CMD_SZ * 7, GFP_KERNEL);
 201         if (!desc)
 202                 return -ENOMEM;
 203
 204         for (sh_idx = 0; sh_idx < RNG4_MAX_HANDLES; sh_idx++) {
 205                 /*
 206                  * If the corresponding bit is set, this state handle
 207                  * was initialized by somebody else, so it's left alone.
 208                  */
 209                 if ((1 << sh_idx) & state_handle_mask)
 210                         continue;
 211
 212                 /* Create the descriptor for instantiating RNG State Handle */
 213                 build_instantiation_desc(desc, sh_idx, gen_sk);
 214
 215                 /* Try to run it through DECO0 */
 216                 ret = run_descriptor_deco0(ctrldev, desc, &status);
 217
 218                 /*
 219                  * If ret is not 0, or descriptor status is not 0, then
 220                  * something went wrong. No need to try the next state
 221                  * handle (if available), bail out here.
 222                  * Also, if for some reason, the State Handle didn't get
 223                  * instantiated although the descriptor has finished
 224                  * without any error (HW optimizations for later
 225                  * CAAM eras), then try again.
 226                  */
 227                 rdsta_val = rd_reg32(&ctrl->r4tst[0].rdsta) & RDSTA_IFMASK;
 228                 if ((status && status != JRSTA_SSRC_JUMP_HALT_CC) ||
 229                     !(rdsta_val & (1 << sh_idx)))
 230                         ret = -EAGAIN;
 231                 if (ret)
 232                         break;
 233                 dev_info(ctrldev, "Instantiated RNG4 SH%d\n", sh_idx);
 234                 /* Clear the contents before recreating the descriptor */
 235                 memset(desc, 0x00, CAAM_CMD_SZ * 7);
 236         }
 237
 238         kfree(desc);
 239
 240         return ret;
 241 }
 242
 243 /*
 244  * deinstantiate_rng - builds and executes a descriptor on DECO0,
 245  *                     which deinitializes the RNG block.
 246  * @ctrldev - pointer to device
 247  * @state_handle_mask - bitmask containing the instantiation status
 248  *                      for the RNG4 state handles which exist in
 249  *                      the RNG4 block: 1 if it's been instantiated
 250  *
 251  * Return: - 0 if no error occurred
 252  *         - -ENOMEM if there isn't enough memory to allocate the descriptor
 253  *         - -ENODEV if DECO0 couldn't be acquired
 254  *         - -EAGAIN if an error occurred when executing the descriptor
 255  */
 256 static int deinstantiate_rng(struct device *ctrldev, int state_handle_mask)
 257 {
 258         u32 *desc, status;
 259         int sh_idx, ret = 0;
 260
 261         desc = kmalloc(CAAM_CMD_SZ * 3, GFP_KERNEL);
 262         if (!desc)
 263                 return -ENOMEM;
 264
 265         for (sh_idx = 0; sh_idx < RNG4_MAX_HANDLES; sh_idx++) {
 266                 /*
 267                  * If the corresponding bit is set, then it means the state
 268                  * handle was initialized by us, and thus it needs to be
 269                  * deintialized as well
 270                  */
 271                 if ((1 << sh_idx) & state_handle_mask) {
 272                         /*
 273                          * Create the descriptor for deinstantating this state
 274                          * handle
 275                          */
 276                         build_deinstantiation_desc(desc, sh_idx);
 277
 278                         /* Try to run it through DECO0 */
 279                         ret = run_descriptor_deco0(ctrldev, desc, &status);
 280
 281                         if (ret || status) {
 282                                 dev_err(ctrldev,
 283                                         "Failed to deinstantiate RNG4 SH%d\n",
 284                                         sh_idx);
 285                                 break;
 286                         }
 287                         dev_info(ctrldev, "Deinstantiated RNG4 SH%d\n", sh_idx);
 288                 }
 289         }
 290
 291         kfree(desc);
 292
 293         return ret;
 294 }
 295
 296 static int caam_remove(struct platform_device *pdev)
 297 {
 298         struct device *ctrldev;
 299         struct caam_drv_private *ctrlpriv;
 300         struct caam_ctrl __iomem *ctrl;
 301         int ring;
 302
 303         ctrldev = &pdev->dev;
 304         ctrlpriv = dev_get_drvdata(ctrldev);
 305         ctrl = (struct caam_ctrl __iomem *)ctrlpriv->ctrl;
 306
 307         /* Remove platform devices for JobRs */
 308         for (ring = 0; ring < ctrlpriv->total_jobrs; ring++) {
 309                 if (ctrlpriv->jrpdev[ring])
 310                         of_device_unregister(ctrlpriv->jrpdev[ring]);
 311         }
 312
 313         /* De-initialize RNG state handles initialized by this driver. */
 314         if (ctrlpriv->rng4_sh_init)
 315                 deinstantiate_rng(ctrldev, ctrlpriv->rng4_sh_init);
 316
 317         /* Shut down debug views */
 318 #ifdef CONFIG_DEBUG_FS
 319         debugfs_remove_recursive(ctrlpriv->dfs_root);
 320 #endif
 321
 322         /* Unmap controller region */
 323         iounmap(ctrl);
 324
 325         /* shut clocks off before finalizing shutdown */
 326         clk_disable_unprepare(ctrlpriv->caam_ipg);
 327         clk_disable_unprepare(ctrlpriv->caam_mem);
 328         clk_disable_unprepare(ctrlpriv->caam_aclk);
 329         clk_disable_unprepare(ctrlpriv->caam_emi_slow);
 330
 331         return 0;
 332 }
 333
 334 /*
 335  * kick_trng - sets the various parameters for enabling the initialization
 336  *             of the RNG4 block in CAAM
 337  * @pdev - pointer to the platform device
 338  * @ent_delay - Defines the length (in system clocks) of each entropy sample.
 339  */
 340 static void kick_trng(struct platform_device *pdev, int ent_delay)
 341 {
 342         struct device *ctrldev = &pdev->dev;
 343         struct caam_drv_private *ctrlpriv = dev_get_drvdata(ctrldev);
 344         struct caam_ctrl __iomem *ctrl;
 345         struct rng4tst __iomem *r4tst;
 346         u32 val;
 347
 348         ctrl = (struct caam_ctrl __iomem *)ctrlpriv->ctrl;
 349         r4tst = &ctrl->r4tst[0];
 350
 351         /* put RNG4 into program mode */
 352         setbits32(&r4tst->rtmctl, RTMCTL_PRGM);
 353
 354         /*
 355          * Performance-wise, it does not make sense to
 356          * set the delay to a value that is lower
 357          * than the last one that worked (i.e. the state handles
 358          * were instantiated properly. Thus, instead of wasting
 359          * time trying to set the values controlling the sample
 360          * frequency, the function simply returns.
 361          */
 362         val = (rd_reg32(&r4tst->rtsdctl) & RTSDCTL_ENT_DLY_MASK)
 363               >> RTSDCTL_ENT_DLY_SHIFT;
 364         if (ent_delay <= val) {
 365                 /* put RNG4 into run mode */
 366                 clrbits32(&r4tst->rtmctl, RTMCTL_PRGM);
 367                 return;
 368         }
 369
 370         val = rd_reg32(&r4tst->rtsdctl);
 371         val = (val & ~RTSDCTL_ENT_DLY_MASK) |
 372               (ent_delay << RTSDCTL_ENT_DLY_SHIFT);
 373         wr_reg32(&r4tst->rtsdctl, val);
 374         /* min. freq. count, equal to 1/4 of the entropy sample length */
 375         wr_reg32(&r4tst->rtfrqmin, ent_delay >> 2);
 376         /* disable maximum frequency count */
 377         wr_reg32(&r4tst->rtfrqmax, RTFRQMAX_DISABLE);
 378         /* read the control register */
 379         val = rd_reg32(&r4tst->rtmctl);
 380         /*
 381          * select raw sampling in both entropy shifter
 382          * and statistical checker
 383          */
 384         setbits32(&val, RTMCTL_SAMP_MODE_RAW_ES_SC);
 385         /* put RNG4 into run mode */
 386         clrbits32(&val, RTMCTL_PRGM);
 387         /* write back the control register */
 388         wr_reg32(&r4tst->rtmctl, val);
 389 }
 390
 391 /**
 392  * caam_get_era() - Return the ERA of the SEC on SoC, based
 393  * on "sec-era" propery in the DTS. This property is updated by u-boot.
 394  **/
 395 int caam_get_era(void)
 396 {
 397         struct device_node *caam_node;
 398         int ret;
 399         u32 prop;
 400
 401         caam_node = of_find_compatible_node(NULL, NULL, "fsl,sec-v4.0");
 402         ret = of_property_read_u32(caam_node, "fsl,sec-era", &prop);
 403         of_node_put(caam_node);
 404
 405         return IS_ERR_VALUE(ret) ? -ENOTSUPP : prop;
 406 }
 407 EXPORT_SYMBOL(caam_get_era);
 408
 409 /* Probe routine for CAAM top (controller) level */
 410 static int caam_probe(struct platform_device *pdev)
 411 {
 412         int ret, ring, rspec, gen_sk, ent_delay = RTSDCTL_ENT_DLY_MIN;
 413         u64 caam_id;
 414         struct device *dev;
 415         struct device_node *nprop, *np;
 416         struct caam_ctrl __iomem *ctrl;
 417         struct caam_drv_private *ctrlpriv;
 418         struct clk *clk;
 419 #ifdef CONFIG_DEBUG_FS
 420         struct caam_perfmon *perfmon;
 421 #endif
 422         u32 scfgr, comp_params;
 423         u32 cha_vid_ls;
 424         int pg_size;
 425         int BLOCK_OFFSET = 0;
 426
 427         ctrlpriv = devm_kzalloc(&pdev->dev, sizeof(*ctrlpriv), GFP_KERNEL);
 428         if (!ctrlpriv)
 429                 return -ENOMEM;
 430
 431         dev = &pdev->dev;
 432         dev_set_drvdata(dev, ctrlpriv);
 433         ctrlpriv->pdev = pdev;
 434         nprop = pdev->dev.of_node;
 435
 436         /* Enable clocking */
 437         clk = caam_drv_identify_clk(&pdev->dev, "ipg");
 438         if (IS_ERR(clk)) {
 439                 ret = PTR_ERR(clk);
 440                 dev_err(&pdev->dev,
 441                         "can't identify CAAM ipg clk: %d\n", ret);
 442                 return ret;
 443         }
 444         ctrlpriv->caam_ipg = clk;
 445
 446         clk = caam_drv_identify_clk(&pdev->dev, "mem");
 447         if (IS_ERR(clk)) {
 448                 ret = PTR_ERR(clk);
 449                 dev_err(&pdev->dev,
 450                         "can't identify CAAM mem clk: %d\n", ret);
 451                 return ret;
 452         }
 453         ctrlpriv->caam_mem = clk;
 454
 455         clk = caam_drv_identify_clk(&pdev->dev, "aclk");
 456         if (IS_ERR(clk)) {
 457                 ret = PTR_ERR(clk);
 458                 dev_err(&pdev->dev,
 459                         "can't identify CAAM aclk clk: %d\n", ret);
 460                 return ret;
 461         }
 462         ctrlpriv->caam_aclk = clk;
 463
 464         clk = caam_drv_identify_clk(&pdev->dev, "emi_slow");
 465         if (IS_ERR(clk)) {
 466                 ret = PTR_ERR(clk);
 467                 dev_err(&pdev->dev,
 468                         "can't identify CAAM emi_slow clk: %d\n", ret);
 469                 return ret;
 470         }
 471         ctrlpriv->caam_emi_slow = clk;
 472
 473         ret = clk_prepare_enable(ctrlpriv->caam_ipg);
 474         if (ret < 0) {
 475                 dev_err(&pdev->dev, "can't enable CAAM ipg clock: %d\n", ret);
 476                 return ret;
 477         }
 478
 479         ret = clk_prepare_enable(ctrlpriv->caam_mem);
 480         if (ret < 0) {
 481                 dev_err(&pdev->dev, "can't enable CAAM secure mem clock: %d\n",
 482                         ret);
 483                 goto disable_caam_ipg;
 484         }
 485
 486         ret = clk_prepare_enable(ctrlpriv->caam_aclk);
 487         if (ret < 0) {
 488                 dev_err(&pdev->dev, "can't enable CAAM aclk clock: %d\n", ret);
 489                 goto disable_caam_mem;
 490         }
 491
 492         ret = clk_prepare_enable(ctrlpriv->caam_emi_slow);
 493         if (ret < 0) {
 494                 dev_err(&pdev->dev, "can't enable CAAM emi slow clock: %d\n",
 495                         ret);
 496                 goto disable_caam_aclk;
 497         }
 498
 499         /* Get configuration properties from device tree */
 500         /* First, get register page */
 501         ctrl = of_iomap(nprop, 0);
 502         if (ctrl == NULL) {
 503                 dev_err(dev, "caam: of_iomap() failed\n");
 504                 ret = -ENOMEM;
 505                 goto disable_caam_emi_slow;
 506         }
 507         /* Finding the page size for using the CTPR_MS register */
 508         comp_params = rd_reg32(&ctrl->perfmon.comp_parms_ms);
 509         pg_size = (comp_params & CTPR_MS_PG_SZ_MASK) >> CTPR_MS_PG_SZ_SHIFT;
 510
 511         /* Allocating the BLOCK_OFFSET based on the supported page size on
 512          * the platform
 513          */
 514         if (pg_size == 0)
 515                 BLOCK_OFFSET = PG_SIZE_4K;
 516         else
 517                 BLOCK_OFFSET = PG_SIZE_64K;
 518
 519         ctrlpriv->ctrl = (struct caam_ctrl __force *)ctrl;
 520         ctrlpriv->assure = (struct caam_assurance __force *)
 521                            ((uint8_t *)ctrl +
 522                             BLOCK_OFFSET * ASSURE_BLOCK_NUMBER
 523                            );
 524         ctrlpriv->deco = (struct caam_deco __force *)
 525                          ((uint8_t *)ctrl +
 526                          BLOCK_OFFSET * DECO_BLOCK_NUMBER
 527                          );
 528
 529         /* Get the IRQ of the controller (for security violations only) */
 530         ctrlpriv->secvio_irq = irq_of_parse_and_map(nprop, 0);
 531
 532         /*
 533          * Enable DECO watchdogs and, if this is a PHYS_ADDR_T_64BIT kernel,
 534          * long pointers in master configuration register
 535          */
 536         clrsetbits_32(&ctrl->mcr, MCFGR_AWCACHE_MASK, MCFGR_AWCACHE_CACH |
 537                       MCFGR_WDENABLE | (sizeof(dma_addr_t) == sizeof(u64) ?
 538                                         MCFGR_LONG_PTR : 0));
 539
 540         /*
 541          *  Read the Compile Time paramters and SCFGR to determine
 542          * if Virtualization is enabled for this platform
 543          */
 544         scfgr = rd_reg32(&ctrl->scfgr);
 545
 546         ctrlpriv->virt_en = 0;
 547         if (comp_params & CTPR_MS_VIRT_EN_INCL) {
 548                 /* VIRT_EN_INCL = 1 & VIRT_EN_POR = 1 or
 549                  * VIRT_EN_INCL = 1 & VIRT_EN_POR = 0 & SCFGR_VIRT_EN = 1
 550                  */
 551                 if ((comp_params & CTPR_MS_VIRT_EN_POR) ||
 552                     (!(comp_params & CTPR_MS_VIRT_EN_POR) &&
 553                        (scfgr & SCFGR_VIRT_EN)))
 554                                 ctrlpriv->virt_en = 1;
 555         } else {
 556                 /* VIRT_EN_INCL = 0 && VIRT_EN_POR_VALUE = 1 */
 557                 if (comp_params & CTPR_MS_VIRT_EN_POR)
 558                                 ctrlpriv->virt_en = 1;
 559         }
 560
 561         if (ctrlpriv->virt_en == 1)
 562                 setbits32(&ctrl->jrstart, JRSTART_JR0_START |
 563                           JRSTART_JR1_START | JRSTART_JR2_START |
 564                           JRSTART_JR3_START);
 565
 566         if (sizeof(dma_addr_t) == sizeof(u64))
 567                 if (of_device_is_compatible(nprop, "fsl,sec-v5.0"))
 568                         dma_set_mask_and_coherent(dev, DMA_BIT_MASK(40));
 569                 else
 570                         dma_set_mask_and_coherent(dev, DMA_BIT_MASK(36));
 571         else
 572                 dma_set_mask_and_coherent(dev, DMA_BIT_MASK(32));
 573
 574         /*
 575          * Detect and enable JobRs
 576          * First, find out how many ring spec'ed, allocate references
 577          * for all, then go probe each one.
 578          */
 579         rspec = 0;
 580         for_each_available_child_of_node(nprop, np)
 581                 if (of_device_is_compatible(np, "fsl,sec-v4.0-job-ring") ||
 582                     of_device_is_compatible(np, "fsl,sec4.0-job-ring"))
 583                         rspec++;
 584
 585         ctrlpriv->jrpdev = devm_kcalloc(&pdev->dev, rspec,
 586                                         sizeof(*ctrlpriv->jrpdev), GFP_KERNEL);
 587         if (ctrlpriv->jrpdev == NULL) {
 588                 ret = -ENOMEM;
 589                 goto iounmap_ctrl;
 590         }
 591
 592         ring = 0;
 593         ctrlpriv->total_jobrs = 0;
 594         for_each_available_child_of_node(nprop, np)
 595                 if (of_device_is_compatible(np, "fsl,sec-v4.0-job-ring") ||
 596                     of_device_is_compatible(np, "fsl,sec4.0-job-ring")) {
 597                         ctrlpriv->jrpdev[ring] =
 598                                 of_platform_device_create(np, NULL, dev);
 599                         if (!ctrlpriv->jrpdev[ring]) {
 600                                 pr_warn("JR%d Platform device creation error\n",
 601                                         ring);
 602                                 continue;
 603                         }
 604                         ctrlpriv->jr[ring] = (struct caam_job_ring __force *)
 605                                              ((uint8_t *)ctrl +
 606                                              (ring + JR_BLOCK_NUMBER) *
 607                                               BLOCK_OFFSET
 608                                              );
 609                         ctrlpriv->total_jobrs++;
 610                         ring++;
 611         }
 612
 613         /* Check to see if QI present. If so, enable */
 614         ctrlpriv->qi_present =
 615                         !!(rd_reg32(&ctrl->perfmon.comp_parms_ms) &
 616                            CTPR_MS_QI_MASK);
 617         if (ctrlpriv->qi_present) {
 618                 ctrlpriv->qi = (struct caam_queue_if __force *)
 619                                ((uint8_t *)ctrl +
 620                                  BLOCK_OFFSET * QI_BLOCK_NUMBER
 621                                );
 622                 /* This is all that's required to physically enable QI */
 623                 wr_reg32(&ctrlpriv->qi->qi_control_lo, QICTL_DQEN);
 624         }
 625
 626         /* If no QI and no rings specified, quit and go home */
 627         if ((!ctrlpriv->qi_present) && (!ctrlpriv->total_jobrs)) {
 628                 dev_err(dev, "no queues configured, terminating\n");
 629                 ret = -ENOMEM;
 630                 goto caam_remove;
 631         }
 632
 633         cha_vid_ls = rd_reg32(&ctrl->perfmon.cha_id_ls);
 634
 635         /*
 636          * If SEC has RNG version >= 4 and RNG state handle has not been
 637          * already instantiated, do RNG instantiation
 638          */
 639         if ((cha_vid_ls & CHA_ID_LS_RNG_MASK) >> CHA_ID_LS_RNG_SHIFT >= 4) {
 640                 ctrlpriv->rng4_sh_init =
 641                         rd_reg32(&ctrl->r4tst[0].rdsta);
 642                 /*
 643                  * If the secure keys (TDKEK, JDKEK, TDSK), were already
 644                  * generated, signal this to the function that is instantiating
 645                  * the state handles. An error would occur if RNG4 attempts
 646                  * to regenerate these keys before the next POR.
 647                  */
 648                 gen_sk = ctrlpriv->rng4_sh_init & RDSTA_SKVN ? 0 : 1;
 649                 ctrlpriv->rng4_sh_init &= RDSTA_IFMASK;
 650                 do {
 651                         int inst_handles =
 652                                 rd_reg32(&ctrl->r4tst[0].rdsta) &
 653                                                                 RDSTA_IFMASK;
 654                         /*
 655                          * If either SH were instantiated by somebody else
 656                          * (e.g. u-boot) then it is assumed that the entropy
 657                          * parameters are properly set and thus the function
 658                          * setting these (kick_trng(...)) is skipped.
 659                          * Also, if a handle was instantiated, do not change
 660                          * the TRNG parameters.
 661                          */
 662                         if (!(ctrlpriv->rng4_sh_init || inst_handles)) {
 663                                 dev_info(dev,
 664                                          "Entropy delay = %u\n",
 665                                          ent_delay);
 666                                 kick_trng(pdev, ent_delay);
 667                                 ent_delay += 400;
 668                         }
 669                         /*
 670                          * if instantiate_rng(...) fails, the loop will rerun
 671                          * and the kick_trng(...) function will modfiy the
 672                          * upper and lower limits of the entropy sampling
 673                          * interval, leading to a sucessful initialization of
 674                          * the RNG.
 675                          */
 676                         ret = instantiate_rng(dev, inst_handles,
 677                                               gen_sk);
 678                         if (ret == -EAGAIN)
 679                                 /*
 680                                  * if here, the loop will rerun,
 681                                  * so don't hog the CPU
 682                                  */
 683                                 cpu_relax();
 684                 } while ((ret == -EAGAIN) && (ent_delay < RTSDCTL_ENT_DLY_MAX));
 685                 if (ret) {
 686                         dev_err(dev, "failed to instantiate RNG");
 687                         goto caam_remove;
 688                 }
 689                 /*
 690                  * Set handles init'ed by this module as the complement of the
 691                  * already initialized ones
 692                  */
 693                 ctrlpriv->rng4_sh_init = ~ctrlpriv->rng4_sh_init & RDSTA_IFMASK;
 694
 695                 /* Enable RDB bit so that RNG works faster */
 696                 setbits32(&ctrl->scfgr, SCFGR_RDBENABLE);
 697         }
 698
 699         /* NOTE: RTIC detection ought to go here, around Si time */
 700
 701         caam_id = (u64)rd_reg32(&ctrl->perfmon.caam_id_ms) << 32 |
 702                   (u64)rd_reg32(&ctrl->perfmon.caam_id_ls);
 703
 704         /* Report "alive" for developer to see */
 705         dev_info(dev, "device ID = 0x%016llx (Era %d)\n", caam_id,
 706                  caam_get_era());
 707         dev_info(dev, "job rings = %d, qi = %d\n",
 708                  ctrlpriv->total_jobrs, ctrlpriv->qi_present);
 709
 710 #ifdef CONFIG_DEBUG_FS
 711         /*
 712          * FIXME: needs better naming distinction, as some amalgamation of
 713          * "caam" and nprop->full_name. The OF name isn't distinctive,
 714          * but does separate instances
 715          */
 716         perfmon = (struct caam_perfmon __force *)&ctrl->perfmon;
 717
 718         ctrlpriv->dfs_root = debugfs_create_dir(dev_name(dev), NULL);
 719         ctrlpriv->ctl = debugfs_create_dir("ctl", ctrlpriv->dfs_root);
 720
 721         /* Controller-level - performance monitor counters */
 722         ctrlpriv->ctl_rq_dequeued =
 723                 debugfs_create_u64("rq_dequeued",
 724                                    S_IRUSR | S_IRGRP | S_IROTH,
 725                                    ctrlpriv->ctl, &perfmon->req_dequeued);
 726         ctrlpriv->ctl_ob_enc_req =
 727                 debugfs_create_u64("ob_rq_encrypted",
 728                                    S_IRUSR | S_IRGRP | S_IROTH,
 729                                    ctrlpriv->ctl, &perfmon->ob_enc_req);
 730         ctrlpriv->ctl_ib_dec_req =
 731                 debugfs_create_u64("ib_rq_decrypted",
 732                                    S_IRUSR | S_IRGRP | S_IROTH,
 733                                    ctrlpriv->ctl, &perfmon->ib_dec_req);
 734         ctrlpriv->ctl_ob_enc_bytes =
 735                 debugfs_create_u64("ob_bytes_encrypted",
 736                                    S_IRUSR | S_IRGRP | S_IROTH,
 737                                    ctrlpriv->ctl, &perfmon->ob_enc_bytes);
 738         ctrlpriv->ctl_ob_prot_bytes =
 739                 debugfs_create_u64("ob_bytes_protected",
 740                                    S_IRUSR | S_IRGRP | S_IROTH,
 741                                    ctrlpriv->ctl, &perfmon->ob_prot_bytes);
 742         ctrlpriv->ctl_ib_dec_bytes =
 743                 debugfs_create_u64("ib_bytes_decrypted",
 744                                    S_IRUSR | S_IRGRP | S_IROTH,
 745                                    ctrlpriv->ctl, &perfmon->ib_dec_bytes);
 746         ctrlpriv->ctl_ib_valid_bytes =
 747                 debugfs_create_u64("ib_bytes_validated",
 748                                    S_IRUSR | S_IRGRP | S_IROTH,
 749                                    ctrlpriv->ctl, &perfmon->ib_valid_bytes);
 750
 751         /* Controller level - global status values */
 752         ctrlpriv->ctl_faultaddr =
 753                 debugfs_create_u64("fault_addr",
 754                                    S_IRUSR | S_IRGRP | S_IROTH,
 755                                    ctrlpriv->ctl, &perfmon->faultaddr);
 756         ctrlpriv->ctl_faultdetail =
 757                 debugfs_create_u32("fault_detail",
 758                                    S_IRUSR | S_IRGRP | S_IROTH,
 759                                    ctrlpriv->ctl, &perfmon->faultdetail);
 760         ctrlpriv->ctl_faultstatus =
 761                 debugfs_create_u32("fault_status",
 762                                    S_IRUSR | S_IRGRP | S_IROTH,
 763                                    ctrlpriv->ctl, &perfmon->status);
 764
 765         /* Internal covering keys (useful in non-secure mode only) */
 766         ctrlpriv->ctl_kek_wrap.data = &ctrlpriv->ctrl->kek[0];
 767         ctrlpriv->ctl_kek_wrap.size = KEK_KEY_SIZE * sizeof(u32);
 768         ctrlpriv->ctl_kek = debugfs_create_blob("kek",
 769                                                 S_IRUSR |
 770                                                 S_IRGRP | S_IROTH,
 771                                                 ctrlpriv->ctl,
 772                                                 &ctrlpriv->ctl_kek_wrap);
 773
 774         ctrlpriv->ctl_tkek_wrap.data = &ctrlpriv->ctrl->tkek[0];
 775         ctrlpriv->ctl_tkek_wrap.size = KEK_KEY_SIZE * sizeof(u32);
 776         ctrlpriv->ctl_tkek = debugfs_create_blob("tkek",
 777                                                  S_IRUSR |
 778                                                  S_IRGRP | S_IROTH,
 779                                                  ctrlpriv->ctl,
 780                                                  &ctrlpriv->ctl_tkek_wrap);
 781
 782         ctrlpriv->ctl_tdsk_wrap.data = &ctrlpriv->ctrl->tdsk[0];
 783         ctrlpriv->ctl_tdsk_wrap.size = KEK_KEY_SIZE * sizeof(u32);
 784         ctrlpriv->ctl_tdsk = debugfs_create_blob("tdsk",
 785                                                  S_IRUSR |
 786                                                  S_IRGRP | S_IROTH,
 787                                                  ctrlpriv->ctl,
 788                                                  &ctrlpriv->ctl_tdsk_wrap);
 789 #endif
 790         return 0;
 791
 792 caam_remove:
 793         caam_remove(pdev);
 794 iounmap_ctrl:
 795         iounmap(ctrl);
 796 disable_caam_emi_slow:
 797         clk_disable_unprepare(ctrlpriv->caam_emi_slow);
 798 disable_caam_aclk:
 799         clk_disable_unprepare(ctrlpriv->caam_aclk);
 800 disable_caam_mem:
 801         clk_disable_unprepare(ctrlpriv->caam_mem);
 802 disable_caam_ipg:
 803         clk_disable_unprepare(ctrlpriv->caam_ipg);
 804         return ret;
 805 }
 806
 807 static struct of_device_id caam_match[] = {
 808         {
 809                 .compatible = "fsl,sec-v4.0",
 810         },
 811         {
 812                 .compatible = "fsl,sec4.0",
 813         },
 814         {},
 815 };
 816 MODULE_DEVICE_TABLE(of, caam_match);
 817
 818 static struct platform_driver caam_driver = {
 819         .driver = {
 820                 .name = "caam",
 821                 .of_match_table = caam_match,
 822         },
 823         .probe       = caam_probe,
 824         .remove      = caam_remove,
 825 };
 826
 827 module_platform_driver(caam_driver);
 828
 829 MODULE_LICENSE("GPL");
 830 MODULE_DESCRIPTION("FSL CAAM request backend");
 831 MODULE_AUTHOR("Freescale Semiconductor - NMG/STC");