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