Pileus Git - ~andy/linux/blob - drivers/crypto/caam/jr.c

   1 /*
   2  * CAAM/SEC 4.x transport/backend driver
   3  * JobR backend functionality
   4  *
   5  * Copyright 2008-2012 Freescale Semiconductor, Inc.
   6  */
   7
   8 #include "compat.h"
   9 #include "regs.h"
  10 #include "jr.h"
  11 #include "desc.h"
  12 #include "intern.h"
  13
  14 struct jr_driver_data {
  15         /* List of Physical JobR's with the Driver */
  16         struct list_head        jr_list;
  17         spinlock_t              jr_alloc_lock;  /* jr_list lock */
  18 } ____cacheline_aligned;
  19
  20 static struct jr_driver_data driver_data;
  21
  22 static int caam_reset_hw_jr(struct device *dev)
  23 {
  24         struct caam_drv_private_jr *jrp = dev_get_drvdata(dev);
  25         unsigned int timeout = 100000;
  26
  27         /*
  28          * mask interrupts since we are going to poll
  29          * for reset completion status
  30          */
  31         setbits32(&jrp->rregs->rconfig_lo, JRCFG_IMSK);
  32
  33         /* initiate flush (required prior to reset) */
  34         wr_reg32(&jrp->rregs->jrcommand, JRCR_RESET);
  35         while (((rd_reg32(&jrp->rregs->jrintstatus) & JRINT_ERR_HALT_MASK) ==
  36                 JRINT_ERR_HALT_INPROGRESS) && --timeout)
  37                 cpu_relax();
  38
  39         if ((rd_reg32(&jrp->rregs->jrintstatus) & JRINT_ERR_HALT_MASK) !=
  40             JRINT_ERR_HALT_COMPLETE || timeout == 0) {
  41                 dev_err(dev, "failed to flush job ring %d\n", jrp->ridx);
  42                 return -EIO;
  43         }
  44
  45         /* initiate reset */
  46         timeout = 100000;
  47         wr_reg32(&jrp->rregs->jrcommand, JRCR_RESET);
  48         while ((rd_reg32(&jrp->rregs->jrcommand) & JRCR_RESET) && --timeout)
  49                 cpu_relax();
  50
  51         if (timeout == 0) {
  52                 dev_err(dev, "failed to reset job ring %d\n", jrp->ridx);
  53                 return -EIO;
  54         }
  55
  56         /* unmask interrupts */
  57         clrbits32(&jrp->rregs->rconfig_lo, JRCFG_IMSK);
  58
  59         return 0;
  60 }
  61
  62 /*
  63  * Shutdown JobR independent of platform property code
  64  */
  65 int caam_jr_shutdown(struct device *dev)
  66 {
  67         struct caam_drv_private_jr *jrp = dev_get_drvdata(dev);
  68         dma_addr_t inpbusaddr, outbusaddr;
  69         int ret;
  70
  71         ret = caam_reset_hw_jr(dev);
  72
  73         tasklet_kill(&jrp->irqtask);
  74
  75         /* Release interrupt */
  76         free_irq(jrp->irq, dev);
  77
  78         /* Free rings */
  79         inpbusaddr = rd_reg64(&jrp->rregs->inpring_base);
  80         outbusaddr = rd_reg64(&jrp->rregs->outring_base);
  81         dma_free_coherent(dev, sizeof(dma_addr_t) * JOBR_DEPTH,
  82                           jrp->inpring, inpbusaddr);
  83         dma_free_coherent(dev, sizeof(struct jr_outentry) * JOBR_DEPTH,
  84                           jrp->outring, outbusaddr);
  85         kfree(jrp->entinfo);
  86
  87         return ret;
  88 }
  89
  90 static int caam_jr_remove(struct platform_device *pdev)
  91 {
  92         int ret;
  93         struct device *jrdev;
  94         struct caam_drv_private_jr *jrpriv;
  95
  96         jrdev = &pdev->dev;
  97         jrpriv = dev_get_drvdata(jrdev);
  98
  99         /*
 100          * Return EBUSY if job ring already allocated.
 101          */
 102         if (atomic_read(&jrpriv->tfm_count)) {
 103                 dev_err(jrdev, "Device is busy\n");
 104                 return -EBUSY;
 105         }
 106
 107         /* Remove the node from Physical JobR list maintained by driver */
 108         spin_lock(&driver_data.jr_alloc_lock);
 109         list_del(&jrpriv->list_node);
 110         spin_unlock(&driver_data.jr_alloc_lock);
 111
 112         /* Release ring */
 113         ret = caam_jr_shutdown(jrdev);
 114         if (ret)
 115                 dev_err(jrdev, "Failed to shut down job ring\n");
 116         irq_dispose_mapping(jrpriv->irq);
 117
 118         return ret;
 119 }
 120
 121 /* Main per-ring interrupt handler */
 122 static irqreturn_t caam_jr_interrupt(int irq, void *st_dev)
 123 {
 124         struct device *dev = st_dev;
 125         struct caam_drv_private_jr *jrp = dev_get_drvdata(dev);
 126         u32 irqstate;
 127
 128         /*
 129          * Check the output ring for ready responses, kick
 130          * tasklet if jobs done.
 131          */
 132         irqstate = rd_reg32(&jrp->rregs->jrintstatus);
 133         if (!irqstate)
 134                 return IRQ_NONE;
 135
 136         /*
 137          * If JobR error, we got more development work to do
 138          * Flag a bug now, but we really need to shut down and
 139          * restart the queue (and fix code).
 140          */
 141         if (irqstate & JRINT_JR_ERROR) {
 142                 dev_err(dev, "job ring error: irqstate: %08x\n", irqstate);
 143                 BUG();
 144         }
 145
 146         /* mask valid interrupts */
 147         setbits32(&jrp->rregs->rconfig_lo, JRCFG_IMSK);
 148
 149         /* Have valid interrupt at this point, just ACK and trigger */
 150         wr_reg32(&jrp->rregs->jrintstatus, irqstate);
 151
 152         preempt_disable();
 153         tasklet_schedule(&jrp->irqtask);
 154         preempt_enable();
 155
 156         return IRQ_HANDLED;
 157 }
 158
 159 /* Deferred service handler, run as interrupt-fired tasklet */
 160 static void caam_jr_dequeue(unsigned long devarg)
 161 {
 162         int hw_idx, sw_idx, i, head, tail;
 163         struct device *dev = (struct device *)devarg;
 164         struct caam_drv_private_jr *jrp = dev_get_drvdata(dev);
 165         void (*usercall)(struct device *dev, u32 *desc, u32 status, void *arg);
 166         u32 *userdesc, userstatus;
 167         void *userarg;
 168
 169         while (rd_reg32(&jrp->rregs->outring_used)) {
 170
 171                 head = ACCESS_ONCE(jrp->head);
 172
 173                 spin_lock(&jrp->outlock);
 174
 175                 sw_idx = tail = jrp->tail;
 176                 hw_idx = jrp->out_ring_read_index;
 177
 178                 for (i = 0; CIRC_CNT(head, tail + i, JOBR_DEPTH) >= 1; i++) {
 179                         sw_idx = (tail + i) & (JOBR_DEPTH - 1);
 180
 181                         smp_read_barrier_depends();
 182
 183                         if (jrp->outring[hw_idx].desc ==
 184                             jrp->entinfo[sw_idx].desc_addr_dma)
 185                                 break; /* found */
 186                 }
 187                 /* we should never fail to find a matching descriptor */
 188                 BUG_ON(CIRC_CNT(head, tail + i, JOBR_DEPTH) <= 0);
 189
 190                 /* Unmap just-run descriptor so we can post-process */
 191                 dma_unmap_single(dev, jrp->outring[hw_idx].desc,
 192                                  jrp->entinfo[sw_idx].desc_size,
 193                                  DMA_TO_DEVICE);
 194
 195                 /* mark completed, avoid matching on a recycled desc addr */
 196                 jrp->entinfo[sw_idx].desc_addr_dma = 0;
 197
 198                 /* Stash callback params for use outside of lock */
 199                 usercall = jrp->entinfo[sw_idx].callbk;
 200                 userarg = jrp->entinfo[sw_idx].cbkarg;
 201                 userdesc = jrp->entinfo[sw_idx].desc_addr_virt;
 202                 userstatus = jrp->outring[hw_idx].jrstatus;
 203
 204                 /* set done */
 205                 wr_reg32(&jrp->rregs->outring_rmvd, 1);
 206
 207                 jrp->out_ring_read_index = (jrp->out_ring_read_index + 1) &
 208                                            (JOBR_DEPTH - 1);
 209
 210                 /*
 211                  * if this job completed out-of-order, do not increment
 212                  * the tail.  Otherwise, increment tail by 1 plus the
 213                  * number of subsequent jobs already completed out-of-order
 214                  */
 215                 if (sw_idx == tail) {
 216                         do {
 217                                 tail = (tail + 1) & (JOBR_DEPTH - 1);
 218                                 smp_read_barrier_depends();
 219                         } while (CIRC_CNT(head, tail, JOBR_DEPTH) >= 1 &&
 220                                  jrp->entinfo[tail].desc_addr_dma == 0);
 221
 222                         jrp->tail = tail;
 223                 }
 224
 225                 spin_unlock(&jrp->outlock);
 226
 227                 /* Finally, execute user's callback */
 228                 usercall(dev, userdesc, userstatus, userarg);
 229         }
 230
 231         /* reenable / unmask IRQs */
 232         clrbits32(&jrp->rregs->rconfig_lo, JRCFG_IMSK);
 233 }
 234
 235 /**
 236  * caam_jr_alloc() - Alloc a job ring for someone to use as needed.
 237  *
 238  * returns :  pointer to the newly allocated physical
 239  *            JobR dev can be written to if successful.
 240  **/
 241 struct device *caam_jr_alloc(void)
 242 {
 243         struct caam_drv_private_jr *jrpriv, *min_jrpriv = NULL;
 244         struct device *dev = NULL;
 245         int min_tfm_cnt = INT_MAX;
 246         int tfm_cnt;
 247
 248         spin_lock(&driver_data.jr_alloc_lock);
 249
 250         if (list_empty(&driver_data.jr_list)) {
 251                 spin_unlock(&driver_data.jr_alloc_lock);
 252                 return ERR_PTR(-ENODEV);
 253         }
 254
 255         list_for_each_entry(jrpriv, &driver_data.jr_list, list_node) {
 256                 tfm_cnt = atomic_read(&jrpriv->tfm_count);
 257                 if (tfm_cnt < min_tfm_cnt) {
 258                         min_tfm_cnt = tfm_cnt;
 259                         min_jrpriv = jrpriv;
 260                 }
 261                 if (!min_tfm_cnt)
 262                         break;
 263         }
 264
 265         if (min_jrpriv) {
 266                 atomic_inc(&min_jrpriv->tfm_count);
 267                 dev = min_jrpriv->dev;
 268         }
 269         spin_unlock(&driver_data.jr_alloc_lock);
 270
 271         return dev;
 272 }
 273 EXPORT_SYMBOL(caam_jr_alloc);
 274
 275 /**
 276  * caam_jr_free() - Free the Job Ring
 277  * @rdev     - points to the dev that identifies the Job ring to
 278  *             be released.
 279  **/
 280 void caam_jr_free(struct device *rdev)
 281 {
 282         struct caam_drv_private_jr *jrpriv = dev_get_drvdata(rdev);
 283
 284         atomic_dec(&jrpriv->tfm_count);
 285 }
 286 EXPORT_SYMBOL(caam_jr_free);
 287
 288 /**
 289  * caam_jr_enqueue() - Enqueue a job descriptor head. Returns 0 if OK,
 290  * -EBUSY if the queue is full, -EIO if it cannot map the caller's
 291  * descriptor.
 292  * @dev:  device of the job ring to be used. This device should have
 293  *        been assigned prior by caam_jr_register().
 294  * @desc: points to a job descriptor that execute our request. All
 295  *        descriptors (and all referenced data) must be in a DMAable
 296  *        region, and all data references must be physical addresses
 297  *        accessible to CAAM (i.e. within a PAMU window granted
 298  *        to it).
 299  * @cbk:  pointer to a callback function to be invoked upon completion
 300  *        of this request. This has the form:
 301  *        callback(struct device *dev, u32 *desc, u32 stat, void *arg)
 302  *        where:
 303  *        @dev:    contains the job ring device that processed this
 304  *                 response.
 305  *        @desc:   descriptor that initiated the request, same as
 306  *                 "desc" being argued to caam_jr_enqueue().
 307  *        @status: untranslated status received from CAAM. See the
 308  *                 reference manual for a detailed description of
 309  *                 error meaning, or see the JRSTA definitions in the
 310  *                 register header file
 311  *        @areq:   optional pointer to an argument passed with the
 312  *                 original request
 313  * @areq: optional pointer to a user argument for use at callback
 314  *        time.
 315  **/
 316 int caam_jr_enqueue(struct device *dev, u32 *desc,
 317                     void (*cbk)(struct device *dev, u32 *desc,
 318                                 u32 status, void *areq),
 319                     void *areq)
 320 {
 321         struct caam_drv_private_jr *jrp = dev_get_drvdata(dev);
 322         struct caam_jrentry_info *head_entry;
 323         int head, tail, desc_size;
 324         dma_addr_t desc_dma;
 325
 326         desc_size = (*desc & HDR_JD_LENGTH_MASK) * sizeof(u32);
 327         desc_dma = dma_map_single(dev, desc, desc_size, DMA_TO_DEVICE);
 328         if (dma_mapping_error(dev, desc_dma)) {
 329                 dev_err(dev, "caam_jr_enqueue(): can't map jobdesc\n");
 330                 return -EIO;
 331         }
 332
 333         spin_lock_bh(&jrp->inplock);
 334
 335         head = jrp->head;
 336         tail = ACCESS_ONCE(jrp->tail);
 337
 338         if (!rd_reg32(&jrp->rregs->inpring_avail) ||
 339             CIRC_SPACE(head, tail, JOBR_DEPTH) <= 0) {
 340                 spin_unlock_bh(&jrp->inplock);
 341                 dma_unmap_single(dev, desc_dma, desc_size, DMA_TO_DEVICE);
 342                 return -EBUSY;
 343         }
 344
 345         head_entry = &jrp->entinfo[head];
 346         head_entry->desc_addr_virt = desc;
 347         head_entry->desc_size = desc_size;
 348         head_entry->callbk = (void *)cbk;
 349         head_entry->cbkarg = areq;
 350         head_entry->desc_addr_dma = desc_dma;
 351
 352         jrp->inpring[jrp->inp_ring_write_index] = desc_dma;
 353
 354         smp_wmb();
 355
 356         jrp->inp_ring_write_index = (jrp->inp_ring_write_index + 1) &
 357                                     (JOBR_DEPTH - 1);
 358         jrp->head = (head + 1) & (JOBR_DEPTH - 1);
 359
 360         wr_reg32(&jrp->rregs->inpring_jobadd, 1);
 361
 362         spin_unlock_bh(&jrp->inplock);
 363
 364         return 0;
 365 }
 366 EXPORT_SYMBOL(caam_jr_enqueue);
 367
 368 /*
 369  * Init JobR independent of platform property detection
 370  */
 371 static int caam_jr_init(struct device *dev)
 372 {
 373         struct caam_drv_private_jr *jrp;
 374         dma_addr_t inpbusaddr, outbusaddr;
 375         int i, error;
 376
 377         jrp = dev_get_drvdata(dev);
 378
 379         tasklet_init(&jrp->irqtask, caam_jr_dequeue, (unsigned long)dev);
 380
 381         /* Connect job ring interrupt handler. */
 382         error = request_irq(jrp->irq, caam_jr_interrupt, IRQF_SHARED,
 383                             dev_name(dev), dev);
 384         if (error) {
 385                 dev_err(dev, "can't connect JobR %d interrupt (%d)\n",
 386                         jrp->ridx, jrp->irq);
 387                 irq_dispose_mapping(jrp->irq);
 388                 jrp->irq = 0;
 389                 return -EINVAL;
 390         }
 391
 392         error = caam_reset_hw_jr(dev);
 393         if (error)
 394                 return error;
 395
 396         jrp->inpring = dma_alloc_coherent(dev, sizeof(dma_addr_t) * JOBR_DEPTH,
 397                                           &inpbusaddr, GFP_KERNEL);
 398
 399         jrp->outring = dma_alloc_coherent(dev, sizeof(struct jr_outentry) *
 400                                           JOBR_DEPTH, &outbusaddr, GFP_KERNEL);
 401
 402         jrp->entinfo = kzalloc(sizeof(struct caam_jrentry_info) * JOBR_DEPTH,
 403                                GFP_KERNEL);
 404
 405         if ((jrp->inpring == NULL) || (jrp->outring == NULL) ||
 406             (jrp->entinfo == NULL)) {
 407                 dev_err(dev, "can't allocate job rings for %d\n",
 408                         jrp->ridx);
 409                 return -ENOMEM;
 410         }
 411
 412         for (i = 0; i < JOBR_DEPTH; i++)
 413                 jrp->entinfo[i].desc_addr_dma = !0;
 414
 415         /* Setup rings */
 416         jrp->inp_ring_write_index = 0;
 417         jrp->out_ring_read_index = 0;
 418         jrp->head = 0;
 419         jrp->tail = 0;
 420
 421         wr_reg64(&jrp->rregs->inpring_base, inpbusaddr);
 422         wr_reg64(&jrp->rregs->outring_base, outbusaddr);
 423         wr_reg32(&jrp->rregs->inpring_size, JOBR_DEPTH);
 424         wr_reg32(&jrp->rregs->outring_size, JOBR_DEPTH);
 425
 426         jrp->ringsize = JOBR_DEPTH;
 427
 428         spin_lock_init(&jrp->inplock);
 429         spin_lock_init(&jrp->outlock);
 430
 431         /* Select interrupt coalescing parameters */
 432         setbits32(&jrp->rregs->rconfig_lo, JOBR_INTC |
 433                   (JOBR_INTC_COUNT_THLD << JRCFG_ICDCT_SHIFT) |
 434                   (JOBR_INTC_TIME_THLD << JRCFG_ICTT_SHIFT));
 435
 436         return 0;
 437 }
 438
 439
 440 /*
 441  * Probe routine for each detected JobR subsystem.
 442  */
 443 static int caam_jr_probe(struct platform_device *pdev)
 444 {
 445         struct device *jrdev;
 446         struct device_node *nprop;
 447         struct caam_job_ring __iomem *ctrl;
 448         struct caam_drv_private_jr *jrpriv;
 449         static int total_jobrs;
 450         int error;
 451
 452         jrdev = &pdev->dev;
 453         jrpriv = kmalloc(sizeof(struct caam_drv_private_jr),
 454                          GFP_KERNEL);
 455         if (!jrpriv)
 456                 return -ENOMEM;
 457
 458         dev_set_drvdata(jrdev, jrpriv);
 459
 460         /* save ring identity relative to detection */
 461         jrpriv->ridx = total_jobrs++;
 462
 463         nprop = pdev->dev.of_node;
 464         /* Get configuration properties from device tree */
 465         /* First, get register page */
 466         ctrl = of_iomap(nprop, 0);
 467         if (!ctrl) {
 468                 dev_err(jrdev, "of_iomap() failed\n");
 469                 return -ENOMEM;
 470         }
 471
 472         jrpriv->rregs = (struct caam_job_ring __force *)ctrl;
 473
 474         if (sizeof(dma_addr_t) == sizeof(u64))
 475                 if (of_device_is_compatible(nprop, "fsl,sec-v5.0-job-ring"))
 476                         dma_set_mask(jrdev, DMA_BIT_MASK(40));
 477                 else
 478                         dma_set_mask(jrdev, DMA_BIT_MASK(36));
 479         else
 480                 dma_set_mask(jrdev, DMA_BIT_MASK(32));
 481
 482         /* Identify the interrupt */
 483         jrpriv->irq = of_irq_to_resource(nprop, 0, NULL);
 484
 485         /* Now do the platform independent part */
 486         error = caam_jr_init(jrdev); /* now turn on hardware */
 487         if (error) {
 488                 kfree(jrpriv);
 489                 return error;
 490         }
 491
 492         jrpriv->dev = jrdev;
 493         spin_lock(&driver_data.jr_alloc_lock);
 494         list_add_tail(&jrpriv->list_node, &driver_data.jr_list);
 495         spin_unlock(&driver_data.jr_alloc_lock);
 496
 497         atomic_set(&jrpriv->tfm_count, 0);
 498
 499         return 0;
 500 }
 501
 502 static struct of_device_id caam_jr_match[] = {
 503         {
 504                 .compatible = "fsl,sec-v4.0-job-ring",
 505         },
 506         {
 507                 .compatible = "fsl,sec4.0-job-ring",
 508         },
 509         {},
 510 };
 511 MODULE_DEVICE_TABLE(of, caam_jr_match);
 512
 513 static struct platform_driver caam_jr_driver = {
 514         .driver = {
 515                 .name = "caam_jr",
 516                 .owner = THIS_MODULE,
 517                 .of_match_table = caam_jr_match,
 518         },
 519         .probe       = caam_jr_probe,
 520         .remove      = caam_jr_remove,
 521 };
 522
 523 static int __init jr_driver_init(void)
 524 {
 525         spin_lock_init(&driver_data.jr_alloc_lock);
 526         INIT_LIST_HEAD(&driver_data.jr_list);
 527         return platform_driver_register(&caam_jr_driver);
 528 }
 529
 530 static void __exit jr_driver_exit(void)
 531 {
 532         platform_driver_unregister(&caam_jr_driver);
 533 }
 534
 535 module_init(jr_driver_init);
 536 module_exit(jr_driver_exit);
 537
 538 MODULE_LICENSE("GPL");
 539 MODULE_DESCRIPTION("FSL CAAM JR request backend");
 540 MODULE_AUTHOR("Freescale Semiconductor - NMG/STC");