drivers/iommu/msm_iommu.c

   1 /* Copyright (c) 2010-2011, Code Aurora Forum. All rights reserved.
   2  *
   3  * This program is free software; you can redistribute it and/or modify
   4  * it under the terms of the GNU General Public License version 2 and
   5  * only version 2 as published by the Free Software Foundation.
   6  *
   7  * This program is distributed in the hope that it will be useful,
   8  * but WITHOUT ANY WARRANTY; without even the implied warranty of
   9  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  10  * GNU General Public License for more details.
  11  *
  12  * You should have received a copy of the GNU General Public License
  13  * along with this program; if not, write to the Free Software
  14  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  15  * 02110-1301, USA.
  16  */
  17
  18 #define pr_fmt(fmt)     KBUILD_MODNAME ": " fmt
  19 #include <linux/kernel.h>
  20 #include <linux/module.h>
  21 #include <linux/platform_device.h>
  22 #include <linux/errno.h>
  23 #include <linux/io.h>
  24 #include <linux/interrupt.h>
  25 #include <linux/list.h>
  26 #include <linux/spinlock.h>
  27 #include <linux/slab.h>
  28 #include <linux/iommu.h>
  29 #include <linux/clk.h>
  30
  31 #include <asm/cacheflush.h>
  32 #include <asm/sizes.h>
  33
  34 #include <mach/iommu_hw-8xxx.h>
  35 #include <mach/iommu.h>
  36
  37 #define MRC(reg, processor, op1, crn, crm, op2)                         \
  38 __asm__ __volatile__ (                                                  \
  39 "   mrc   "   #processor "," #op1 ", %0,"  #crn "," #crm "," #op2 "\n"  \
  40 : "=r" (reg))
  41
  42 #define RCP15_PRRR(reg)         MRC(reg, p15, 0, c10, c2, 0)
  43 #define RCP15_NMRR(reg)         MRC(reg, p15, 0, c10, c2, 1)
  44
  45 /* bitmap of the page sizes currently supported */
  46 #define MSM_IOMMU_PGSIZES       (SZ_4K | SZ_64K | SZ_1M | SZ_16M)
  47
  48 static int msm_iommu_tex_class[4];
  49
  50 DEFINE_SPINLOCK(msm_iommu_lock);
  51
  52 struct msm_priv {
  53         unsigned long *pgtable;
  54         struct list_head list_attached;
  55 };
  56
  57 static int __enable_clocks(struct msm_iommu_drvdata *drvdata)
  58 {
  59         int ret;
  60
  61         ret = clk_enable(drvdata->pclk);
  62         if (ret)
  63                 goto fail;
  64
  65         if (drvdata->clk) {
  66                 ret = clk_enable(drvdata->clk);
  67                 if (ret)
  68                         clk_disable(drvdata->pclk);
  69         }
  70 fail:
  71         return ret;
  72 }
  73
  74 static void __disable_clocks(struct msm_iommu_drvdata *drvdata)
  75 {
  76         if (drvdata->clk)
  77                 clk_disable(drvdata->clk);
  78         clk_disable(drvdata->pclk);
  79 }
  80
  81 static int __flush_iotlb(struct iommu_domain *domain)
  82 {
  83         struct msm_priv *priv = domain->priv;
  84         struct msm_iommu_drvdata *iommu_drvdata;
  85         struct msm_iommu_ctx_drvdata *ctx_drvdata;
  86         int ret = 0;
  87 #ifndef CONFIG_IOMMU_PGTABLES_L2
  88         unsigned long *fl_table = priv->pgtable;
  89         int i;
  90
  91         if (!list_empty(&priv->list_attached)) {
  92                 dmac_flush_range(fl_table, fl_table + SZ_16K);
  93
  94                 for (i = 0; i < NUM_FL_PTE; i++)
  95                         if ((fl_table[i] & 0x03) == FL_TYPE_TABLE) {
  96                                 void *sl_table = __va(fl_table[i] &
  97                                                                 FL_BASE_MASK);
  98                                 dmac_flush_range(sl_table, sl_table + SZ_4K);
  99                         }
 100         }
 101 #endif
 102
 103         list_for_each_entry(ctx_drvdata, &priv->list_attached, attached_elm) {
 104                 if (!ctx_drvdata->pdev || !ctx_drvdata->pdev->dev.parent)
 105                         BUG();
 106
 107                 iommu_drvdata = dev_get_drvdata(ctx_drvdata->pdev->dev.parent);
 108                 BUG_ON(!iommu_drvdata);
 109
 110                 ret = __enable_clocks(iommu_drvdata);
 111                 if (ret)
 112                         goto fail;
 113
 114                 SET_CTX_TLBIALL(iommu_drvdata->base, ctx_drvdata->num, 0);
 115                 __disable_clocks(iommu_drvdata);
 116         }
 117 fail:
 118         return ret;
 119 }
 120
 121 static void __reset_context(void __iomem *base, int ctx)
 122 {
 123         SET_BPRCOSH(base, ctx, 0);
 124         SET_BPRCISH(base, ctx, 0);
 125         SET_BPRCNSH(base, ctx, 0);
 126         SET_BPSHCFG(base, ctx, 0);
 127         SET_BPMTCFG(base, ctx, 0);
 128         SET_ACTLR(base, ctx, 0);
 129         SET_SCTLR(base, ctx, 0);
 130         SET_FSRRESTORE(base, ctx, 0);
 131         SET_TTBR0(base, ctx, 0);
 132         SET_TTBR1(base, ctx, 0);
 133         SET_TTBCR(base, ctx, 0);
 134         SET_BFBCR(base, ctx, 0);
 135         SET_PAR(base, ctx, 0);
 136         SET_FAR(base, ctx, 0);
 137         SET_CTX_TLBIALL(base, ctx, 0);
 138         SET_TLBFLPTER(base, ctx, 0);
 139         SET_TLBSLPTER(base, ctx, 0);
 140         SET_TLBLKCR(base, ctx, 0);
 141         SET_PRRR(base, ctx, 0);
 142         SET_NMRR(base, ctx, 0);
 143 }
 144
 145 static void __program_context(void __iomem *base, int ctx, phys_addr_t pgtable)
 146 {
 147         unsigned int prrr, nmrr;
 148         __reset_context(base, ctx);
 149
 150         /* Set up HTW mode */
 151         /* TLB miss configuration: perform HTW on miss */
 152         SET_TLBMCFG(base, ctx, 0x3);
 153
 154         /* V2P configuration: HTW for access */
 155         SET_V2PCFG(base, ctx, 0x3);
 156
 157         SET_TTBCR(base, ctx, 0);
 158         SET_TTBR0_PA(base, ctx, (pgtable >> 14));
 159
 160         /* Invalidate the TLB for this context */
 161         SET_CTX_TLBIALL(base, ctx, 0);
 162
 163         /* Set interrupt number to "secure" interrupt */
 164         SET_IRPTNDX(base, ctx, 0);
 165
 166         /* Enable context fault interrupt */
 167         SET_CFEIE(base, ctx, 1);
 168
 169         /* Stall access on a context fault and let the handler deal with it */
 170         SET_CFCFG(base, ctx, 1);
 171
 172         /* Redirect all cacheable requests to L2 slave port. */
 173         SET_RCISH(base, ctx, 1);
 174         SET_RCOSH(base, ctx, 1);
 175         SET_RCNSH(base, ctx, 1);
 176
 177         /* Turn on TEX Remap */
 178         SET_TRE(base, ctx, 1);
 179
 180         /* Set TEX remap attributes */
 181         RCP15_PRRR(prrr);
 182         RCP15_NMRR(nmrr);
 183         SET_PRRR(base, ctx, prrr);
 184         SET_NMRR(base, ctx, nmrr);
 185
 186         /* Turn on BFB prefetch */
 187         SET_BFBDFE(base, ctx, 1);
 188
 189 #ifdef CONFIG_IOMMU_PGTABLES_L2
 190         /* Configure page tables as inner-cacheable and shareable to reduce
 191          * the TLB miss penalty.
 192          */
 193         SET_TTBR0_SH(base, ctx, 1);
 194         SET_TTBR1_SH(base, ctx, 1);
 195
 196         SET_TTBR0_NOS(base, ctx, 1);
 197         SET_TTBR1_NOS(base, ctx, 1);
 198
 199         SET_TTBR0_IRGNH(base, ctx, 0); /* WB, WA */
 200         SET_TTBR0_IRGNL(base, ctx, 1);
 201
 202         SET_TTBR1_IRGNH(base, ctx, 0); /* WB, WA */
 203         SET_TTBR1_IRGNL(base, ctx, 1);
 204
 205         SET_TTBR0_ORGN(base, ctx, 1); /* WB, WA */
 206         SET_TTBR1_ORGN(base, ctx, 1); /* WB, WA */
 207 #endif
 208
 209         /* Enable the MMU */
 210         SET_M(base, ctx, 1);
 211 }
 212
 213 static int msm_iommu_domain_init(struct iommu_domain *domain)
 214 {
 215         struct msm_priv *priv = kzalloc(sizeof(*priv), GFP_KERNEL);
 216
 217         if (!priv)
 218                 goto fail_nomem;
 219
 220         INIT_LIST_HEAD(&priv->list_attached);
 221         priv->pgtable = (unsigned long *)__get_free_pages(GFP_KERNEL,
 222                                                           get_order(SZ_16K));
 223
 224         if (!priv->pgtable)
 225                 goto fail_nomem;
 226
 227         memset(priv->pgtable, 0, SZ_16K);
 228         domain->priv = priv;
 229
 230         domain->geometry.aperture_start = 0;
 231         domain->geometry.aperture_end   = (1ULL << 32) - 1;
 232         domain->geometry.force_aperture = true;
 233
 234         return 0;
 235
 236 fail_nomem:
 237         kfree(priv);
 238         return -ENOMEM;
 239 }
 240
 241 static void msm_iommu_domain_destroy(struct iommu_domain *domain)
 242 {
 243         struct msm_priv *priv;
 244         unsigned long flags;
 245         unsigned long *fl_table;
 246         int i;
 247
 248         spin_lock_irqsave(&msm_iommu_lock, flags);
 249         priv = domain->priv;
 250         domain->priv = NULL;
 251
 252         if (priv) {
 253                 fl_table = priv->pgtable;
 254
 255                 for (i = 0; i < NUM_FL_PTE; i++)
 256                         if ((fl_table[i] & 0x03) == FL_TYPE_TABLE)
 257                                 free_page((unsigned long) __va(((fl_table[i]) &
 258                                                                 FL_BASE_MASK)));
 259
 260                 free_pages((unsigned long)priv->pgtable, get_order(SZ_16K));
 261                 priv->pgtable = NULL;
 262         }
 263
 264         kfree(priv);
 265         spin_unlock_irqrestore(&msm_iommu_lock, flags);
 266 }
 267
 268 static int msm_iommu_attach_dev(struct iommu_domain *domain, struct device *dev)
 269 {
 270         struct msm_priv *priv;
 271         struct msm_iommu_ctx_dev *ctx_dev;
 272         struct msm_iommu_drvdata *iommu_drvdata;
 273         struct msm_iommu_ctx_drvdata *ctx_drvdata;
 274         struct msm_iommu_ctx_drvdata *tmp_drvdata;
 275         int ret = 0;
 276         unsigned long flags;
 277
 278         spin_lock_irqsave(&msm_iommu_lock, flags);
 279
 280         priv = domain->priv;
 281
 282         if (!priv || !dev) {
 283                 ret = -EINVAL;
 284                 goto fail;
 285         }
 286
 287         iommu_drvdata = dev_get_drvdata(dev->parent);
 288         ctx_drvdata = dev_get_drvdata(dev);
 289         ctx_dev = dev->platform_data;
 290
 291         if (!iommu_drvdata || !ctx_drvdata || !ctx_dev) {
 292                 ret = -EINVAL;
 293                 goto fail;
 294         }
 295
 296         if (!list_empty(&ctx_drvdata->attached_elm)) {
 297                 ret = -EBUSY;
 298                 goto fail;
 299         }
 300
 301         list_for_each_entry(tmp_drvdata, &priv->list_attached, attached_elm)
 302                 if (tmp_drvdata == ctx_drvdata) {
 303                         ret = -EBUSY;
 304                         goto fail;
 305                 }
 306
 307         ret = __enable_clocks(iommu_drvdata);
 308         if (ret)
 309                 goto fail;
 310
 311         __program_context(iommu_drvdata->base, ctx_dev->num,
 312                           __pa(priv->pgtable));
 313
 314         __disable_clocks(iommu_drvdata);
 315         list_add(&(ctx_drvdata->attached_elm), &priv->list_attached);
 316         ret = __flush_iotlb(domain);
 317
 318 fail:
 319         spin_unlock_irqrestore(&msm_iommu_lock, flags);
 320         return ret;
 321 }
 322
 323 static void msm_iommu_detach_dev(struct iommu_domain *domain,
 324                                  struct device *dev)
 325 {
 326         struct msm_priv *priv;
 327         struct msm_iommu_ctx_dev *ctx_dev;
 328         struct msm_iommu_drvdata *iommu_drvdata;
 329         struct msm_iommu_ctx_drvdata *ctx_drvdata;
 330         unsigned long flags;
 331         int ret;
 332
 333         spin_lock_irqsave(&msm_iommu_lock, flags);
 334         priv = domain->priv;
 335
 336         if (!priv || !dev)
 337                 goto fail;
 338
 339         iommu_drvdata = dev_get_drvdata(dev->parent);
 340         ctx_drvdata = dev_get_drvdata(dev);
 341         ctx_dev = dev->platform_data;
 342
 343         if (!iommu_drvdata || !ctx_drvdata || !ctx_dev)
 344                 goto fail;
 345
 346         ret = __flush_iotlb(domain);
 347         if (ret)
 348                 goto fail;
 349
 350         ret = __enable_clocks(iommu_drvdata);
 351         if (ret)
 352                 goto fail;
 353
 354         __reset_context(iommu_drvdata->base, ctx_dev->num);
 355         __disable_clocks(iommu_drvdata);
 356         list_del_init(&ctx_drvdata->attached_elm);
 357
 358 fail:
 359         spin_unlock_irqrestore(&msm_iommu_lock, flags);
 360 }
 361
 362 static int msm_iommu_map(struct iommu_domain *domain, unsigned long va,
 363                          phys_addr_t pa, size_t len, int prot)
 364 {
 365         struct msm_priv *priv;
 366         unsigned long flags;
 367         unsigned long *fl_table;
 368         unsigned long *fl_pte;
 369         unsigned long fl_offset;
 370         unsigned long *sl_table;
 371         unsigned long *sl_pte;
 372         unsigned long sl_offset;
 373         unsigned int pgprot;
 374         int ret = 0, tex, sh;
 375
 376         spin_lock_irqsave(&msm_iommu_lock, flags);
 377
 378         sh = (prot & MSM_IOMMU_ATTR_SH) ? 1 : 0;
 379         tex = msm_iommu_tex_class[prot & MSM_IOMMU_CP_MASK];
 380
 381         if (tex < 0 || tex > NUM_TEX_CLASS - 1) {
 382                 ret = -EINVAL;
 383                 goto fail;
 384         }
 385
 386         priv = domain->priv;
 387         if (!priv) {
 388                 ret = -EINVAL;
 389                 goto fail;
 390         }
 391
 392         fl_table = priv->pgtable;
 393
 394         if (len != SZ_16M && len != SZ_1M &&
 395             len != SZ_64K && len != SZ_4K) {
 396                 pr_debug("Bad size: %d\n", len);
 397                 ret = -EINVAL;
 398                 goto fail;
 399         }
 400
 401         if (!fl_table) {
 402                 pr_debug("Null page table\n");
 403                 ret = -EINVAL;
 404                 goto fail;
 405         }
 406
 407         if (len == SZ_16M || len == SZ_1M) {
 408                 pgprot = sh ? FL_SHARED : 0;
 409                 pgprot |= tex & 0x01 ? FL_BUFFERABLE : 0;
 410                 pgprot |= tex & 0x02 ? FL_CACHEABLE : 0;
 411                 pgprot |= tex & 0x04 ? FL_TEX0 : 0;
 412         } else  {
 413                 pgprot = sh ? SL_SHARED : 0;
 414                 pgprot |= tex & 0x01 ? SL_BUFFERABLE : 0;
 415                 pgprot |= tex & 0x02 ? SL_CACHEABLE : 0;
 416                 pgprot |= tex & 0x04 ? SL_TEX0 : 0;
 417         }
 418
 419         fl_offset = FL_OFFSET(va);      /* Upper 12 bits */
 420         fl_pte = fl_table + fl_offset;  /* int pointers, 4 bytes */
 421
 422         if (len == SZ_16M) {
 423                 int i = 0;
 424                 for (i = 0; i < 16; i++)
 425                         *(fl_pte+i) = (pa & 0xFF000000) | FL_SUPERSECTION |
 426                                   FL_AP_READ | FL_AP_WRITE | FL_TYPE_SECT |
 427                                   FL_SHARED | FL_NG | pgprot;
 428         }
 429
 430         if (len == SZ_1M)
 431                 *fl_pte = (pa & 0xFFF00000) | FL_AP_READ | FL_AP_WRITE | FL_NG |
 432                                             FL_TYPE_SECT | FL_SHARED | pgprot;
 433
 434         /* Need a 2nd level table */
 435         if ((len == SZ_4K || len == SZ_64K) && (*fl_pte) == 0) {
 436                 unsigned long *sl;
 437                 sl = (unsigned long *) __get_free_pages(GFP_ATOMIC,
 438                                                         get_order(SZ_4K));
 439
 440                 if (!sl) {
 441                         pr_debug("Could not allocate second level table\n");
 442                         ret = -ENOMEM;
 443                         goto fail;
 444                 }
 445
 446                 memset(sl, 0, SZ_4K);
 447                 *fl_pte = ((((int)__pa(sl)) & FL_BASE_MASK) | FL_TYPE_TABLE);
 448         }
 449
 450         sl_table = (unsigned long *) __va(((*fl_pte) & FL_BASE_MASK));
 451         sl_offset = SL_OFFSET(va);
 452         sl_pte = sl_table + sl_offset;
 453
 454
 455         if (len == SZ_4K)
 456                 *sl_pte = (pa & SL_BASE_MASK_SMALL) | SL_AP0 | SL_AP1 | SL_NG |
 457                                           SL_SHARED | SL_TYPE_SMALL | pgprot;
 458
 459         if (len == SZ_64K) {
 460                 int i;
 461
 462                 for (i = 0; i < 16; i++)
 463                         *(sl_pte+i) = (pa & SL_BASE_MASK_LARGE) | SL_AP0 |
 464                             SL_NG | SL_AP1 | SL_SHARED | SL_TYPE_LARGE | pgprot;
 465         }
 466
 467         ret = __flush_iotlb(domain);
 468 fail:
 469         spin_unlock_irqrestore(&msm_iommu_lock, flags);
 470         return ret;
 471 }
 472
 473 static size_t msm_iommu_unmap(struct iommu_domain *domain, unsigned long va,
 474                             size_t len)
 475 {
 476         struct msm_priv *priv;
 477         unsigned long flags;
 478         unsigned long *fl_table;
 479         unsigned long *fl_pte;
 480         unsigned long fl_offset;
 481         unsigned long *sl_table;
 482         unsigned long *sl_pte;
 483         unsigned long sl_offset;
 484         int i, ret = 0;
 485
 486         spin_lock_irqsave(&msm_iommu_lock, flags);
 487
 488         priv = domain->priv;
 489
 490         if (!priv)
 491                 goto fail;
 492
 493         fl_table = priv->pgtable;
 494
 495         if (len != SZ_16M && len != SZ_1M &&
 496             len != SZ_64K && len != SZ_4K) {
 497                 pr_debug("Bad length: %d\n", len);
 498                 goto fail;
 499         }
 500
 501         if (!fl_table) {
 502                 pr_debug("Null page table\n");
 503                 goto fail;
 504         }
 505
 506         fl_offset = FL_OFFSET(va);      /* Upper 12 bits */
 507         fl_pte = fl_table + fl_offset;  /* int pointers, 4 bytes */
 508
 509         if (*fl_pte == 0) {
 510                 pr_debug("First level PTE is 0\n");
 511                 goto fail;
 512         }
 513
 514         /* Unmap supersection */
 515         if (len == SZ_16M)
 516                 for (i = 0; i < 16; i++)
 517                         *(fl_pte+i) = 0;
 518
 519         if (len == SZ_1M)
 520                 *fl_pte = 0;
 521
 522         sl_table = (unsigned long *) __va(((*fl_pte) & FL_BASE_MASK));
 523         sl_offset = SL_OFFSET(va);
 524         sl_pte = sl_table + sl_offset;
 525
 526         if (len == SZ_64K) {
 527                 for (i = 0; i < 16; i++)
 528                         *(sl_pte+i) = 0;
 529         }
 530
 531         if (len == SZ_4K)
 532                 *sl_pte = 0;
 533
 534         if (len == SZ_4K || len == SZ_64K) {
 535                 int used = 0;
 536
 537                 for (i = 0; i < NUM_SL_PTE; i++)
 538                         if (sl_table[i])
 539                                 used = 1;
 540                 if (!used) {
 541                         free_page((unsigned long)sl_table);
 542                         *fl_pte = 0;
 543                 }
 544         }
 545
 546         ret = __flush_iotlb(domain);
 547
 548 fail:
 549         spin_unlock_irqrestore(&msm_iommu_lock, flags);
 550
 551         /* the IOMMU API requires us to return how many bytes were unmapped */
 552         len = ret ? 0 : len;
 553         return len;
 554 }
 555
 556 static phys_addr_t msm_iommu_iova_to_phys(struct iommu_domain *domain,
 557                                           unsigned long va)
 558 {
 559         struct msm_priv *priv;
 560         struct msm_iommu_drvdata *iommu_drvdata;
 561         struct msm_iommu_ctx_drvdata *ctx_drvdata;
 562         unsigned int par;
 563         unsigned long flags;
 564         void __iomem *base;
 565         phys_addr_t ret = 0;
 566         int ctx;
 567
 568         spin_lock_irqsave(&msm_iommu_lock, flags);
 569
 570         priv = domain->priv;
 571         if (list_empty(&priv->list_attached))
 572                 goto fail;
 573
 574         ctx_drvdata = list_entry(priv->list_attached.next,
 575                                  struct msm_iommu_ctx_drvdata, attached_elm);
 576         iommu_drvdata = dev_get_drvdata(ctx_drvdata->pdev->dev.parent);
 577
 578         base = iommu_drvdata->base;
 579         ctx = ctx_drvdata->num;
 580
 581         ret = __enable_clocks(iommu_drvdata);
 582         if (ret)
 583                 goto fail;
 584
 585         /* Invalidate context TLB */
 586         SET_CTX_TLBIALL(base, ctx, 0);
 587         SET_V2PPR(base, ctx, va & V2Pxx_VA);
 588
 589         par = GET_PAR(base, ctx);
 590
 591         /* We are dealing with a supersection */
 592         if (GET_NOFAULT_SS(base, ctx))
 593                 ret = (par & 0xFF000000) | (va & 0x00FFFFFF);
 594         else    /* Upper 20 bits from PAR, lower 12 from VA */
 595                 ret = (par & 0xFFFFF000) | (va & 0x00000FFF);
 596
 597         if (GET_FAULT(base, ctx))
 598                 ret = 0;
 599
 600         __disable_clocks(iommu_drvdata);
 601 fail:
 602         spin_unlock_irqrestore(&msm_iommu_lock, flags);
 603         return ret;
 604 }
 605
 606 static int msm_iommu_domain_has_cap(struct iommu_domain *domain,
 607                                     unsigned long cap)
 608 {
 609         return 0;
 610 }
 611
 612 static void print_ctx_regs(void __iomem *base, int ctx)
 613 {
 614         unsigned int fsr = GET_FSR(base, ctx);
 615         pr_err("FAR    = %08x    PAR    = %08x\n",
 616                GET_FAR(base, ctx), GET_PAR(base, ctx));
 617         pr_err("FSR    = %08x [%s%s%s%s%s%s%s%s%s%s]\n", fsr,
 618                         (fsr & 0x02) ? "TF " : "",
 619                         (fsr & 0x04) ? "AFF " : "",
 620                         (fsr & 0x08) ? "APF " : "",
 621                         (fsr & 0x10) ? "TLBMF " : "",
 622                         (fsr & 0x20) ? "HTWDEEF " : "",
 623                         (fsr & 0x40) ? "HTWSEEF " : "",
 624                         (fsr & 0x80) ? "MHF " : "",
 625                         (fsr & 0x10000) ? "SL " : "",
 626                         (fsr & 0x40000000) ? "SS " : "",
 627                         (fsr & 0x80000000) ? "MULTI " : "");
 628
 629         pr_err("FSYNR0 = %08x    FSYNR1 = %08x\n",
 630                GET_FSYNR0(base, ctx), GET_FSYNR1(base, ctx));
 631         pr_err("TTBR0  = %08x    TTBR1  = %08x\n",
 632                GET_TTBR0(base, ctx), GET_TTBR1(base, ctx));
 633         pr_err("SCTLR  = %08x    ACTLR  = %08x\n",
 634                GET_SCTLR(base, ctx), GET_ACTLR(base, ctx));
 635         pr_err("PRRR   = %08x    NMRR   = %08x\n",
 636                GET_PRRR(base, ctx), GET_NMRR(base, ctx));
 637 }
 638
 639 irqreturn_t msm_iommu_fault_handler(int irq, void *dev_id)
 640 {
 641         struct msm_iommu_drvdata *drvdata = dev_id;
 642         void __iomem *base;
 643         unsigned int fsr;
 644         int i, ret;
 645
 646         spin_lock(&msm_iommu_lock);
 647
 648         if (!drvdata) {
 649                 pr_err("Invalid device ID in context interrupt handler\n");
 650                 goto fail;
 651         }
 652
 653         base = drvdata->base;
 654
 655         pr_err("Unexpected IOMMU page fault!\n");
 656         pr_err("base = %08x\n", (unsigned int) base);
 657
 658         ret = __enable_clocks(drvdata);
 659         if (ret)
 660                 goto fail;
 661
 662         for (i = 0; i < drvdata->ncb; i++) {
 663                 fsr = GET_FSR(base, i);
 664                 if (fsr) {
 665                         pr_err("Fault occurred in context %d.\n", i);
 666                         pr_err("Interesting registers:\n");
 667                         print_ctx_regs(base, i);
 668                         SET_FSR(base, i, 0x4000000F);
 669                 }
 670         }
 671         __disable_clocks(drvdata);
 672 fail:
 673         spin_unlock(&msm_iommu_lock);
 674         return 0;
 675 }
 676
 677 static struct iommu_ops msm_iommu_ops = {
 678         .domain_init = msm_iommu_domain_init,
 679         .domain_destroy = msm_iommu_domain_destroy,
 680         .attach_dev = msm_iommu_attach_dev,
 681         .detach_dev = msm_iommu_detach_dev,
 682         .map = msm_iommu_map,
 683         .unmap = msm_iommu_unmap,
 684         .iova_to_phys = msm_iommu_iova_to_phys,
 685         .domain_has_cap = msm_iommu_domain_has_cap,
 686         .pgsize_bitmap = MSM_IOMMU_PGSIZES,
 687 };
 688
 689 static int __init get_tex_class(int icp, int ocp, int mt, int nos)
 690 {
 691         int i = 0;
 692         unsigned int prrr = 0;
 693         unsigned int nmrr = 0;
 694         int c_icp, c_ocp, c_mt, c_nos;
 695
 696         RCP15_PRRR(prrr);
 697         RCP15_NMRR(nmrr);
 698
 699         for (i = 0; i < NUM_TEX_CLASS; i++) {
 700                 c_nos = PRRR_NOS(prrr, i);
 701                 c_mt = PRRR_MT(prrr, i);
 702                 c_icp = NMRR_ICP(nmrr, i);
 703                 c_ocp = NMRR_OCP(nmrr, i);
 704
 705                 if (icp == c_icp && ocp == c_ocp && c_mt == mt && c_nos == nos)
 706                         return i;
 707         }
 708
 709         return -ENODEV;
 710 }
 711
 712 static void __init setup_iommu_tex_classes(void)
 713 {
 714         msm_iommu_tex_class[MSM_IOMMU_ATTR_NONCACHED] =
 715                         get_tex_class(CP_NONCACHED, CP_NONCACHED, MT_NORMAL, 1);
 716
 717         msm_iommu_tex_class[MSM_IOMMU_ATTR_CACHED_WB_WA] =
 718                         get_tex_class(CP_WB_WA, CP_WB_WA, MT_NORMAL, 1);
 719
 720         msm_iommu_tex_class[MSM_IOMMU_ATTR_CACHED_WB_NWA] =
 721                         get_tex_class(CP_WB_NWA, CP_WB_NWA, MT_NORMAL, 1);
 722
 723         msm_iommu_tex_class[MSM_IOMMU_ATTR_CACHED_WT] =
 724                         get_tex_class(CP_WT, CP_WT, MT_NORMAL, 1);
 725 }
 726
 727 static int __init msm_iommu_init(void)
 728 {
 729         setup_iommu_tex_classes();
 730         bus_set_iommu(&platform_bus_type, &msm_iommu_ops);
 731         return 0;
 732 }
 733
 734 subsys_initcall(msm_iommu_init);
 735
 736 MODULE_LICENSE("GPL v2");
 737 MODULE_AUTHOR("Stepan Moskovchenko <stepanm@codeaurora.org>");