drivers/crypto/caam/jr.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * CAAM/SEC 4.x transport/backend driver
   4  * JobR backend functionality
   5  *
   6  * Copyright 2008-2012 Freescale Semiconductor, Inc.
   7  * Copyright 2019 NXP
   8  */
   9
  10 #include <linux/of_irq.h>
  11 #include <linux/of_address.h>
  12
  13 #include "compat.h"
  14 #include "ctrl.h"
  15 #include "regs.h"
  16 #include "jr.h"
  17 #include "desc.h"
  18 #include "intern.h"
  19
  20 struct jr_driver_data {
  21         /* List of Physical JobR's with the Driver */
  22         struct list_head        jr_list;
  23         spinlock_t              jr_alloc_lock;  /* jr_list lock */
  24 } ____cacheline_aligned;
  25
  26 static struct jr_driver_data driver_data;
  27 static DEFINE_MUTEX(algs_lock);
  28 static unsigned int active_devs;
  29
  30 static void register_algs(struct caam_drv_private_jr *jrpriv,
  31                           struct device *dev)
  32 {
  33         mutex_lock(&algs_lock);
  34
  35         if (++active_devs != 1)
  36                 goto algs_unlock;
  37
  38         caam_algapi_init(dev);
  39         caam_algapi_hash_init(dev);
  40         caam_pkc_init(dev);
  41         jrpriv->hwrng = !caam_rng_init(dev);
  42         caam_prng_register(dev);
  43         caam_qi_algapi_init(dev);
  44
  45 algs_unlock:
  46         mutex_unlock(&algs_lock);
  47 }
  48
  49 static void unregister_algs(void)
  50 {
  51         mutex_lock(&algs_lock);
  52
  53         if (--active_devs != 0)
  54                 goto algs_unlock;
  55
  56         caam_qi_algapi_exit();
  57         caam_prng_unregister(NULL);
  58         caam_pkc_exit();
  59         caam_algapi_hash_exit();
  60         caam_algapi_exit();
  61
  62 algs_unlock:
  63         mutex_unlock(&algs_lock);
  64 }
  65
  66 static void caam_jr_crypto_engine_exit(void *data)
  67 {
  68         struct device *jrdev = data;
  69         struct caam_drv_private_jr *jrpriv = dev_get_drvdata(jrdev);
  70
  71         /* Free the resources of crypto-engine */
  72         crypto_engine_exit(jrpriv->engine);
  73 }
  74
  75 static int caam_reset_hw_jr(struct device *dev)
  76 {
  77         struct caam_drv_private_jr *jrp = dev_get_drvdata(dev);
  78         unsigned int timeout = 100000;
  79
  80         /*
  81          * mask interrupts since we are going to poll
  82          * for reset completion status
  83          */
  84         clrsetbits_32(&jrp->rregs->rconfig_lo, 0, JRCFG_IMSK);
  85
  86         /* initiate flush (required prior to reset) */
  87         wr_reg32(&jrp->rregs->jrcommand, JRCR_RESET);
  88         while (((rd_reg32(&jrp->rregs->jrintstatus) & JRINT_ERR_HALT_MASK) ==
  89                 JRINT_ERR_HALT_INPROGRESS) && --timeout)
  90                 cpu_relax();
  91
  92         if ((rd_reg32(&jrp->rregs->jrintstatus) & JRINT_ERR_HALT_MASK) !=
  93             JRINT_ERR_HALT_COMPLETE || timeout == 0) {
  94                 dev_err(dev, "failed to flush job ring %d\n", jrp->ridx);
  95                 return -EIO;
  96         }
  97
  98         /* initiate reset */
  99         timeout = 100000;
 100         wr_reg32(&jrp->rregs->jrcommand, JRCR_RESET);
 101         while ((rd_reg32(&jrp->rregs->jrcommand) & JRCR_RESET) && --timeout)
 102                 cpu_relax();
 103
 104         if (timeout == 0) {
 105                 dev_err(dev, "failed to reset job ring %d\n", jrp->ridx);
 106                 return -EIO;
 107         }
 108
 109         /* unmask interrupts */
 110         clrsetbits_32(&jrp->rregs->rconfig_lo, JRCFG_IMSK, 0);
 111
 112         return 0;
 113 }
 114
 115 /*
 116  * Shutdown JobR independent of platform property code
 117  */
 118 static int caam_jr_shutdown(struct device *dev)
 119 {
 120         struct caam_drv_private_jr *jrp = dev_get_drvdata(dev);
 121         int ret;
 122
 123         ret = caam_reset_hw_jr(dev);
 124
 125         tasklet_kill(&jrp->irqtask);
 126
 127         return ret;
 128 }
 129
 130 static int caam_jr_remove(struct platform_device *pdev)
 131 {
 132         int ret;
 133         struct device *jrdev;
 134         struct caam_drv_private_jr *jrpriv;
 135
 136         jrdev = &pdev->dev;
 137         jrpriv = dev_get_drvdata(jrdev);
 138
 139         if (jrpriv->hwrng)
 140                 caam_rng_exit(jrdev->parent);
 141
 142         /*
 143          * Return EBUSY if job ring already allocated.
 144          */
 145         if (atomic_read(&jrpriv->tfm_count)) {
 146                 dev_err(jrdev, "Device is busy\n");
 147                 return -EBUSY;
 148         }
 149
 150         /* Unregister JR-based RNG & crypto algorithms */
 151         unregister_algs();
 152
 153         /* Remove the node from Physical JobR list maintained by driver */
 154         spin_lock(&driver_data.jr_alloc_lock);
 155         list_del(&jrpriv->list_node);
 156         spin_unlock(&driver_data.jr_alloc_lock);
 157
 158         /* Release ring */
 159         ret = caam_jr_shutdown(jrdev);
 160         if (ret)
 161                 dev_err(jrdev, "Failed to shut down job ring\n");
 162
 163         return ret;
 164 }
 165
 166 /* Main per-ring interrupt handler */
 167 static irqreturn_t caam_jr_interrupt(int irq, void *st_dev)
 168 {
 169         struct device *dev = st_dev;
 170         struct caam_drv_private_jr *jrp = dev_get_drvdata(dev);
 171         u32 irqstate;
 172
 173         /*
 174          * Check the output ring for ready responses, kick
 175          * tasklet if jobs done.
 176          */
 177         irqstate = rd_reg32(&jrp->rregs->jrintstatus);
 178         if (!irqstate)
 179                 return IRQ_NONE;
 180
 181         /*
 182          * If JobR error, we got more development work to do
 183          * Flag a bug now, but we really need to shut down and
 184          * restart the queue (and fix code).
 185          */
 186         if (irqstate & JRINT_JR_ERROR) {
 187                 dev_err(dev, "job ring error: irqstate: %08x\n", irqstate);
 188                 BUG();
 189         }
 190
 191         /* mask valid interrupts */
 192         clrsetbits_32(&jrp->rregs->rconfig_lo, 0, JRCFG_IMSK);
 193
 194         /* Have valid interrupt at this point, just ACK and trigger */
 195         wr_reg32(&jrp->rregs->jrintstatus, irqstate);
 196
 197         preempt_disable();
 198         tasklet_schedule(&jrp->irqtask);
 199         preempt_enable();
 200
 201         return IRQ_HANDLED;
 202 }
 203
 204 /* Deferred service handler, run as interrupt-fired tasklet */
 205 static void caam_jr_dequeue(unsigned long devarg)
 206 {
 207         int hw_idx, sw_idx, i, head, tail;
 208         struct device *dev = (struct device *)devarg;
 209         struct caam_drv_private_jr *jrp = dev_get_drvdata(dev);
 210         void (*usercall)(struct device *dev, u32 *desc, u32 status, void *arg);
 211         u32 *userdesc, userstatus;
 212         void *userarg;
 213         u32 outring_used = 0;
 214
 215         while (outring_used ||
 216                (outring_used = rd_reg32(&jrp->rregs->outring_used))) {
 217
 218                 head = READ_ONCE(jrp->head);
 219
 220                 sw_idx = tail = jrp->tail;
 221                 hw_idx = jrp->out_ring_read_index;
 222
 223                 for (i = 0; CIRC_CNT(head, tail + i, JOBR_DEPTH) >= 1; i++) {
 224                         sw_idx = (tail + i) & (JOBR_DEPTH - 1);
 225
 226                         if (jr_outentry_desc(jrp->outring, hw_idx) ==
 227                             caam_dma_to_cpu(jrp->entinfo[sw_idx].desc_addr_dma))
 228                                 break; /* found */
 229                 }
 230                 /* we should never fail to find a matching descriptor */
 231                 BUG_ON(CIRC_CNT(head, tail + i, JOBR_DEPTH) <= 0);
 232
 233                 /* Unmap just-run descriptor so we can post-process */
 234                 dma_unmap_single(dev,
 235                                  caam_dma_to_cpu(jr_outentry_desc(jrp->outring,
 236                                                                   hw_idx)),
 237                                  jrp->entinfo[sw_idx].desc_size,
 238                                  DMA_TO_DEVICE);
 239
 240                 /* mark completed, avoid matching on a recycled desc addr */
 241                 jrp->entinfo[sw_idx].desc_addr_dma = 0;
 242
 243                 /* Stash callback params */
 244                 usercall = jrp->entinfo[sw_idx].callbk;
 245                 userarg = jrp->entinfo[sw_idx].cbkarg;
 246                 userdesc = jrp->entinfo[sw_idx].desc_addr_virt;
 247                 userstatus = caam32_to_cpu(jr_outentry_jrstatus(jrp->outring,
 248                                                                 hw_idx));
 249
 250                 /*
 251                  * Make sure all information from the job has been obtained
 252                  * before telling CAAM that the job has been removed from the
 253                  * output ring.
 254                  */
 255                 mb();
 256
 257                 /* set done */
 258                 wr_reg32(&jrp->rregs->outring_rmvd, 1);
 259
 260                 jrp->out_ring_read_index = (jrp->out_ring_read_index + 1) &
 261                                            (JOBR_DEPTH - 1);
 262
 263                 /*
 264                  * if this job completed out-of-order, do not increment
 265                  * the tail.  Otherwise, increment tail by 1 plus the
 266                  * number of subsequent jobs already completed out-of-order
 267                  */
 268                 if (sw_idx == tail) {
 269                         do {
 270                                 tail = (tail + 1) & (JOBR_DEPTH - 1);
 271                         } while (CIRC_CNT(head, tail, JOBR_DEPTH) >= 1 &&
 272                                  jrp->entinfo[tail].desc_addr_dma == 0);
 273
 274                         jrp->tail = tail;
 275                 }
 276
 277                 /* Finally, execute user's callback */
 278                 usercall(dev, userdesc, userstatus, userarg);
 279                 outring_used--;
 280         }
 281
 282         /* reenable / unmask IRQs */
 283         clrsetbits_32(&jrp->rregs->rconfig_lo, JRCFG_IMSK, 0);
 284 }
 285
 286 /**
 287  * caam_jr_alloc() - Alloc a job ring for someone to use as needed.
 288  *
 289  * returns :  pointer to the newly allocated physical
 290  *            JobR dev can be written to if successful.
 291  **/
 292 struct device *caam_jr_alloc(void)
 293 {
 294         struct caam_drv_private_jr *jrpriv, *min_jrpriv = NULL;
 295         struct device *dev = ERR_PTR(-ENODEV);
 296         int min_tfm_cnt = INT_MAX;
 297         int tfm_cnt;
 298
 299         spin_lock(&driver_data.jr_alloc_lock);
 300
 301         if (list_empty(&driver_data.jr_list)) {
 302                 spin_unlock(&driver_data.jr_alloc_lock);
 303                 return ERR_PTR(-ENODEV);
 304         }
 305
 306         list_for_each_entry(jrpriv, &driver_data.jr_list, list_node) {
 307                 tfm_cnt = atomic_read(&jrpriv->tfm_count);
 308                 if (tfm_cnt < min_tfm_cnt) {
 309                         min_tfm_cnt = tfm_cnt;
 310                         min_jrpriv = jrpriv;
 311                 }
 312                 if (!min_tfm_cnt)
 313                         break;
 314         }
 315
 316         if (min_jrpriv) {
 317                 atomic_inc(&min_jrpriv->tfm_count);
 318                 dev = min_jrpriv->dev;
 319         }
 320         spin_unlock(&driver_data.jr_alloc_lock);
 321
 322         return dev;
 323 }
 324 EXPORT_SYMBOL(caam_jr_alloc);
 325
 326 /**
 327  * caam_jr_free() - Free the Job Ring
 328  * @rdev:      points to the dev that identifies the Job ring to
 329  *             be released.
 330  **/
 331 void caam_jr_free(struct device *rdev)
 332 {
 333         struct caam_drv_private_jr *jrpriv = dev_get_drvdata(rdev);
 334
 335         atomic_dec(&jrpriv->tfm_count);
 336 }
 337 EXPORT_SYMBOL(caam_jr_free);
 338
 339 /**
 340  * caam_jr_enqueue() - Enqueue a job descriptor head. Returns -EINPROGRESS
 341  * if OK, -ENOSPC if the queue is full, -EIO if it cannot map the caller's
 342  * descriptor.
 343  * @dev:  struct device of the job ring to be used
 344  * @desc: points to a job descriptor that execute our request. All
 345  *        descriptors (and all referenced data) must be in a DMAable
 346  *        region, and all data references must be physical addresses
 347  *        accessible to CAAM (i.e. within a PAMU window granted
 348  *        to it).
 349  * @cbk:  pointer to a callback function to be invoked upon completion
 350  *        of this request. This has the form:
 351  *        callback(struct device *dev, u32 *desc, u32 stat, void *arg)
 352  *        where:
 353  *        dev:     contains the job ring device that processed this
 354  *                 response.
 355  *        desc:    descriptor that initiated the request, same as
 356  *                 "desc" being argued to caam_jr_enqueue().
 357  *        status:  untranslated status received from CAAM. See the
 358  *                 reference manual for a detailed description of
 359  *                 error meaning, or see the JRSTA definitions in the
 360  *                 register header file
 361  *        areq:    optional pointer to an argument passed with the
 362  *                 original request
 363  * @areq: optional pointer to a user argument for use at callback
 364  *        time.
 365  **/
 366 int caam_jr_enqueue(struct device *dev, u32 *desc,
 367                     void (*cbk)(struct device *dev, u32 *desc,
 368                                 u32 status, void *areq),
 369                     void *areq)
 370 {
 371         struct caam_drv_private_jr *jrp = dev_get_drvdata(dev);
 372         struct caam_jrentry_info *head_entry;
 373         int head, tail, desc_size;
 374         dma_addr_t desc_dma;
 375
 376         desc_size = (caam32_to_cpu(*desc) & HDR_JD_LENGTH_MASK) * sizeof(u32);
 377         desc_dma = dma_map_single(dev, desc, desc_size, DMA_TO_DEVICE);
 378         if (dma_mapping_error(dev, desc_dma)) {
 379                 dev_err(dev, "caam_jr_enqueue(): can't map jobdesc\n");
 380                 return -EIO;
 381         }
 382
 383         spin_lock_bh(&jrp->inplock);
 384
 385         head = jrp->head;
 386         tail = READ_ONCE(jrp->tail);
 387
 388         if (!jrp->inpring_avail ||
 389             CIRC_SPACE(head, tail, JOBR_DEPTH) <= 0) {
 390                 spin_unlock_bh(&jrp->inplock);
 391                 dma_unmap_single(dev, desc_dma, desc_size, DMA_TO_DEVICE);
 392                 return -ENOSPC;
 393         }
 394
 395         head_entry = &jrp->entinfo[head];
 396         head_entry->desc_addr_virt = desc;
 397         head_entry->desc_size = desc_size;
 398         head_entry->callbk = (void *)cbk;
 399         head_entry->cbkarg = areq;
 400         head_entry->desc_addr_dma = desc_dma;
 401
 402         jr_inpentry_set(jrp->inpring, head, cpu_to_caam_dma(desc_dma));
 403
 404         /*
 405          * Guarantee that the descriptor's DMA address has been written to
 406          * the next slot in the ring before the write index is updated, since
 407          * other cores may update this index independently.
 408          */
 409         smp_wmb();
 410
 411         jrp->head = (head + 1) & (JOBR_DEPTH - 1);
 412
 413         /*
 414          * Ensure that all job information has been written before
 415          * notifying CAAM that a new job was added to the input ring
 416          * using a memory barrier. The wr_reg32() uses api iowrite32()
 417          * to do the register write. iowrite32() issues a memory barrier
 418          * before the write operation.
 419          */
 420
 421         wr_reg32(&jrp->rregs->inpring_jobadd, 1);
 422
 423         jrp->inpring_avail--;
 424         if (!jrp->inpring_avail)
 425                 jrp->inpring_avail = rd_reg32(&jrp->rregs->inpring_avail);
 426
 427         spin_unlock_bh(&jrp->inplock);
 428
 429         return -EINPROGRESS;
 430 }
 431 EXPORT_SYMBOL(caam_jr_enqueue);
 432
 433 /*
 434  * Init JobR independent of platform property detection
 435  */
 436 static int caam_jr_init(struct device *dev)
 437 {
 438         struct caam_drv_private_jr *jrp;
 439         dma_addr_t inpbusaddr, outbusaddr;
 440         int i, error;
 441
 442         jrp = dev_get_drvdata(dev);
 443
 444         error = caam_reset_hw_jr(dev);
 445         if (error)
 446                 return error;
 447
 448         jrp->inpring = dmam_alloc_coherent(dev, SIZEOF_JR_INPENTRY *
 449                                            JOBR_DEPTH, &inpbusaddr,
 450                                            GFP_KERNEL);
 451         if (!jrp->inpring)
 452                 return -ENOMEM;
 453
 454         jrp->outring = dmam_alloc_coherent(dev, SIZEOF_JR_OUTENTRY *
 455                                            JOBR_DEPTH, &outbusaddr,
 456                                            GFP_KERNEL);
 457         if (!jrp->outring)
 458                 return -ENOMEM;
 459
 460         jrp->entinfo = devm_kcalloc(dev, JOBR_DEPTH, sizeof(*jrp->entinfo),
 461                                     GFP_KERNEL);
 462         if (!jrp->entinfo)
 463                 return -ENOMEM;
 464
 465         for (i = 0; i < JOBR_DEPTH; i++)
 466                 jrp->entinfo[i].desc_addr_dma = !0;
 467
 468         /* Setup rings */
 469         jrp->out_ring_read_index = 0;
 470         jrp->head = 0;
 471         jrp->tail = 0;
 472
 473         wr_reg64(&jrp->rregs->inpring_base, inpbusaddr);
 474         wr_reg64(&jrp->rregs->outring_base, outbusaddr);
 475         wr_reg32(&jrp->rregs->inpring_size, JOBR_DEPTH);
 476         wr_reg32(&jrp->rregs->outring_size, JOBR_DEPTH);
 477
 478         jrp->inpring_avail = JOBR_DEPTH;
 479
 480         spin_lock_init(&jrp->inplock);
 481
 482         /* Select interrupt coalescing parameters */
 483         clrsetbits_32(&jrp->rregs->rconfig_lo, 0, JOBR_INTC |
 484                       (JOBR_INTC_COUNT_THLD << JRCFG_ICDCT_SHIFT) |
 485                       (JOBR_INTC_TIME_THLD << JRCFG_ICTT_SHIFT));
 486
 487         tasklet_init(&jrp->irqtask, caam_jr_dequeue, (unsigned long)dev);
 488
 489         /* Connect job ring interrupt handler. */
 490         error = devm_request_irq(dev, jrp->irq, caam_jr_interrupt, IRQF_SHARED,
 491                                  dev_name(dev), dev);
 492         if (error) {
 493                 dev_err(dev, "can't connect JobR %d interrupt (%d)\n",
 494                         jrp->ridx, jrp->irq);
 495                 tasklet_kill(&jrp->irqtask);
 496         }
 497
 498         return error;
 499 }
 500
 501 static void caam_jr_irq_dispose_mapping(void *data)
 502 {
 503         irq_dispose_mapping((unsigned long)data);
 504 }
 505
 506 /*
 507  * Probe routine for each detected JobR subsystem.
 508  */
 509 static int caam_jr_probe(struct platform_device *pdev)
 510 {
 511         struct device *jrdev;
 512         struct device_node *nprop;
 513         struct caam_job_ring __iomem *ctrl;
 514         struct caam_drv_private_jr *jrpriv;
 515         static int total_jobrs;
 516         struct resource *r;
 517         int error;
 518
 519         jrdev = &pdev->dev;
 520         jrpriv = devm_kzalloc(jrdev, sizeof(*jrpriv), GFP_KERNEL);
 521         if (!jrpriv)
 522                 return -ENOMEM;
 523
 524         dev_set_drvdata(jrdev, jrpriv);
 525
 526         /* save ring identity relative to detection */
 527         jrpriv->ridx = total_jobrs++;
 528
 529         nprop = pdev->dev.of_node;
 530         /* Get configuration properties from device tree */
 531         /* First, get register page */
 532         r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 533         if (!r) {
 534                 dev_err(jrdev, "platform_get_resource() failed\n");
 535                 return -ENOMEM;
 536         }
 537
 538         ctrl = devm_ioremap(jrdev, r->start, resource_size(r));
 539         if (!ctrl) {
 540                 dev_err(jrdev, "devm_ioremap() failed\n");
 541                 return -ENOMEM;
 542         }
 543
 544         jrpriv->rregs = (struct caam_job_ring __iomem __force *)ctrl;
 545
 546         error = dma_set_mask_and_coherent(jrdev, caam_get_dma_mask(jrdev));
 547         if (error) {
 548                 dev_err(jrdev, "dma_set_mask_and_coherent failed (%d)\n",
 549                         error);
 550                 return error;
 551         }
 552
 553         /* Initialize crypto engine */
 554         jrpriv->engine = crypto_engine_alloc_init_and_set(jrdev, true, NULL,
 555                                                           false,
 556                                                           CRYPTO_ENGINE_MAX_QLEN);
 557         if (!jrpriv->engine) {
 558                 dev_err(jrdev, "Could not init crypto-engine\n");
 559                 return -ENOMEM;
 560         }
 561
 562         error = devm_add_action_or_reset(jrdev, caam_jr_crypto_engine_exit,
 563                                          jrdev);
 564         if (error)
 565                 return error;
 566
 567         /* Start crypto engine */
 568         error = crypto_engine_start(jrpriv->engine);
 569         if (error) {
 570                 dev_err(jrdev, "Could not start crypto-engine\n");
 571                 return error;
 572         }
 573
 574         /* Identify the interrupt */
 575         jrpriv->irq = irq_of_parse_and_map(nprop, 0);
 576         if (!jrpriv->irq) {
 577                 dev_err(jrdev, "irq_of_parse_and_map failed\n");
 578                 return -EINVAL;
 579         }
 580
 581         error = devm_add_action_or_reset(jrdev, caam_jr_irq_dispose_mapping,
 582                                          (void *)(unsigned long)jrpriv->irq);
 583         if (error)
 584                 return error;
 585
 586         /* Now do the platform independent part */
 587         error = caam_jr_init(jrdev); /* now turn on hardware */
 588         if (error)
 589                 return error;
 590
 591         jrpriv->dev = jrdev;
 592         spin_lock(&driver_data.jr_alloc_lock);
 593         list_add_tail(&jrpriv->list_node, &driver_data.jr_list);
 594         spin_unlock(&driver_data.jr_alloc_lock);
 595
 596         atomic_set(&jrpriv->tfm_count, 0);
 597
 598         register_algs(jrpriv, jrdev->parent);
 599
 600         return 0;
 601 }
 602
 603 static const struct of_device_id caam_jr_match[] = {
 604         {
 605                 .compatible = "fsl,sec-v4.0-job-ring",
 606         },
 607         {
 608                 .compatible = "fsl,sec4.0-job-ring",
 609         },
 610         {},
 611 };
 612 MODULE_DEVICE_TABLE(of, caam_jr_match);
 613
 614 static struct platform_driver caam_jr_driver = {
 615         .driver = {
 616                 .name = "caam_jr",
 617                 .of_match_table = caam_jr_match,
 618         },
 619         .probe       = caam_jr_probe,
 620         .remove      = caam_jr_remove,
 621 };
 622
 623 static int __init jr_driver_init(void)
 624 {
 625         spin_lock_init(&driver_data.jr_alloc_lock);
 626         INIT_LIST_HEAD(&driver_data.jr_list);
 627         return platform_driver_register(&caam_jr_driver);
 628 }
 629
 630 static void __exit jr_driver_exit(void)
 631 {
 632         platform_driver_unregister(&caam_jr_driver);
 633 }
 634
 635 module_init(jr_driver_init);
 636 module_exit(jr_driver_exit);
 637
 638 MODULE_LICENSE("GPL");
 639 MODULE_DESCRIPTION("FSL CAAM JR request backend");
 640 MODULE_AUTHOR("Freescale Semiconductor - NMG/STC");