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 #include <linux/err.h>
  31 #include <linux/of_iommu.h>
  32
  33 #include <asm/cacheflush.h>
  34 #include <asm/sizes.h>
  35
  36 #include "msm_iommu_hw-8xxx.h"
  37 #include "msm_iommu.h"
  38 #include "io-pgtable.h"
  39
  40 #define MRC(reg, processor, op1, crn, crm, op2)                         \
  41 __asm__ __volatile__ (                                                  \
  42 "   mrc   "   #processor "," #op1 ", %0,"  #crn "," #crm "," #op2 "\n"  \
  43 : "=r" (reg))
  44
  45 /* bitmap of the page sizes currently supported */
  46 #define MSM_IOMMU_PGSIZES       (SZ_4K | SZ_64K | SZ_1M | SZ_16M)
  47
  48 DEFINE_SPINLOCK(msm_iommu_lock);
  49 static LIST_HEAD(qcom_iommu_devices);
  50 static struct iommu_ops msm_iommu_ops;
  51
  52 struct msm_priv {
  53         struct list_head list_attached;
  54         struct iommu_domain domain;
  55         struct io_pgtable_cfg   cfg;
  56         struct io_pgtable_ops   *iop;
  57         struct device           *dev;
  58         spinlock_t              pgtlock; /* pagetable lock */
  59 };
  60
  61 static struct msm_priv *to_msm_priv(struct iommu_domain *dom)
  62 {
  63         return container_of(dom, struct msm_priv, domain);
  64 }
  65
  66 static int __enable_clocks(struct msm_iommu_dev *iommu)
  67 {
  68         int ret;
  69
  70         ret = clk_enable(iommu->pclk);
  71         if (ret)
  72                 goto fail;
  73
  74         if (iommu->clk) {
  75                 ret = clk_enable(iommu->clk);
  76                 if (ret)
  77                         clk_disable(iommu->pclk);
  78         }
  79 fail:
  80         return ret;
  81 }
  82
  83 static void __disable_clocks(struct msm_iommu_dev *iommu)
  84 {
  85         if (iommu->clk)
  86                 clk_disable(iommu->clk);
  87         clk_disable(iommu->pclk);
  88 }
  89
  90 static void msm_iommu_reset(void __iomem *base, int ncb)
  91 {
  92         int ctx;
  93
  94         SET_RPUE(base, 0);
  95         SET_RPUEIE(base, 0);
  96         SET_ESRRESTORE(base, 0);
  97         SET_TBE(base, 0);
  98         SET_CR(base, 0);
  99         SET_SPDMBE(base, 0);
 100         SET_TESTBUSCR(base, 0);
 101         SET_TLBRSW(base, 0);
 102         SET_GLOBAL_TLBIALL(base, 0);
 103         SET_RPU_ACR(base, 0);
 104         SET_TLBLKCRWE(base, 1);
 105
 106         for (ctx = 0; ctx < ncb; ctx++) {
 107                 SET_BPRCOSH(base, ctx, 0);
 108                 SET_BPRCISH(base, ctx, 0);
 109                 SET_BPRCNSH(base, ctx, 0);
 110                 SET_BPSHCFG(base, ctx, 0);
 111                 SET_BPMTCFG(base, ctx, 0);
 112                 SET_ACTLR(base, ctx, 0);
 113                 SET_SCTLR(base, ctx, 0);
 114                 SET_FSRRESTORE(base, ctx, 0);
 115                 SET_TTBR0(base, ctx, 0);
 116                 SET_TTBR1(base, ctx, 0);
 117                 SET_TTBCR(base, ctx, 0);
 118                 SET_BFBCR(base, ctx, 0);
 119                 SET_PAR(base, ctx, 0);
 120                 SET_FAR(base, ctx, 0);
 121                 SET_CTX_TLBIALL(base, ctx, 0);
 122                 SET_TLBFLPTER(base, ctx, 0);
 123                 SET_TLBSLPTER(base, ctx, 0);
 124                 SET_TLBLKCR(base, ctx, 0);
 125                 SET_CONTEXTIDR(base, ctx, 0);
 126         }
 127 }
 128
 129 static void __flush_iotlb(void *cookie)
 130 {
 131         struct msm_priv *priv = cookie;
 132         struct msm_iommu_dev *iommu = NULL;
 133         struct msm_iommu_ctx_dev *master;
 134         int ret = 0;
 135
 136         list_for_each_entry(iommu, &priv->list_attached, dom_node) {
 137                 ret = __enable_clocks(iommu);
 138                 if (ret)
 139                         goto fail;
 140
 141                 list_for_each_entry(master, &iommu->ctx_list, list)
 142                         SET_CTX_TLBIALL(iommu->base, master->num, 0);
 143
 144                 __disable_clocks(iommu);
 145         }
 146 fail:
 147         return;
 148 }
 149
 150 static void __flush_iotlb_range(unsigned long iova, size_t size,
 151                                 size_t granule, bool leaf, void *cookie)
 152 {
 153         struct msm_priv *priv = cookie;
 154         struct msm_iommu_dev *iommu = NULL;
 155         struct msm_iommu_ctx_dev *master;
 156         int ret = 0;
 157         int temp_size;
 158
 159         list_for_each_entry(iommu, &priv->list_attached, dom_node) {
 160                 ret = __enable_clocks(iommu);
 161                 if (ret)
 162                         goto fail;
 163
 164                 list_for_each_entry(master, &iommu->ctx_list, list) {
 165                         temp_size = size;
 166                         do {
 167                                 iova &= TLBIVA_VA;
 168                                 iova |= GET_CONTEXTIDR_ASID(iommu->base,
 169                                                             master->num);
 170                                 SET_TLBIVA(iommu->base, master->num, iova);
 171                                 iova += granule;
 172                         } while (temp_size -= granule);
 173                 }
 174
 175                 __disable_clocks(iommu);
 176         }
 177
 178 fail:
 179         return;
 180 }
 181
 182 static void __flush_iotlb_sync(void *cookie)
 183 {
 184         /*
 185          * Nothing is needed here, the barrier to guarantee
 186          * completion of the tlb sync operation is implicitly
 187          * taken care when the iommu client does a writel before
 188          * kick starting the other master.
 189          */
 190 }
 191
 192 static const struct iommu_gather_ops msm_iommu_gather_ops = {
 193         .tlb_flush_all = __flush_iotlb,
 194         .tlb_add_flush = __flush_iotlb_range,
 195         .tlb_sync = __flush_iotlb_sync,
 196 };
 197
 198 static int msm_iommu_alloc_ctx(unsigned long *map, int start, int end)
 199 {
 200         int idx;
 201
 202         do {
 203                 idx = find_next_zero_bit(map, end, start);
 204                 if (idx == end)
 205                         return -ENOSPC;
 206         } while (test_and_set_bit(idx, map));
 207
 208         return idx;
 209 }
 210
 211 static void msm_iommu_free_ctx(unsigned long *map, int idx)
 212 {
 213         clear_bit(idx, map);
 214 }
 215
 216 static void config_mids(struct msm_iommu_dev *iommu,
 217                         struct msm_iommu_ctx_dev *master)
 218 {
 219         int mid, ctx, i;
 220
 221         for (i = 0; i < master->num_mids; i++) {
 222                 mid = master->mids[i];
 223                 ctx = master->num;
 224
 225                 SET_M2VCBR_N(iommu->base, mid, 0);
 226                 SET_CBACR_N(iommu->base, ctx, 0);
 227
 228                 /* Set VMID = 0 */
 229                 SET_VMID(iommu->base, mid, 0);
 230
 231                 /* Set the context number for that MID to this context */
 232                 SET_CBNDX(iommu->base, mid, ctx);
 233
 234                 /* Set MID associated with this context bank to 0*/
 235                 SET_CBVMID(iommu->base, ctx, 0);
 236
 237                 /* Set the ASID for TLB tagging for this context */
 238                 SET_CONTEXTIDR_ASID(iommu->base, ctx, ctx);
 239
 240                 /* Set security bit override to be Non-secure */
 241                 SET_NSCFG(iommu->base, mid, 3);
 242         }
 243 }
 244
 245 static void __reset_context(void __iomem *base, int ctx)
 246 {
 247         SET_BPRCOSH(base, ctx, 0);
 248         SET_BPRCISH(base, ctx, 0);
 249         SET_BPRCNSH(base, ctx, 0);
 250         SET_BPSHCFG(base, ctx, 0);
 251         SET_BPMTCFG(base, ctx, 0);
 252         SET_ACTLR(base, ctx, 0);
 253         SET_SCTLR(base, ctx, 0);
 254         SET_FSRRESTORE(base, ctx, 0);
 255         SET_TTBR0(base, ctx, 0);
 256         SET_TTBR1(base, ctx, 0);
 257         SET_TTBCR(base, ctx, 0);
 258         SET_BFBCR(base, ctx, 0);
 259         SET_PAR(base, ctx, 0);
 260         SET_FAR(base, ctx, 0);
 261         SET_CTX_TLBIALL(base, ctx, 0);
 262         SET_TLBFLPTER(base, ctx, 0);
 263         SET_TLBSLPTER(base, ctx, 0);
 264         SET_TLBLKCR(base, ctx, 0);
 265 }
 266
 267 static void __program_context(void __iomem *base, int ctx,
 268                               struct msm_priv *priv)
 269 {
 270         __reset_context(base, ctx);
 271
 272         /* Turn on TEX Remap */
 273         SET_TRE(base, ctx, 1);
 274         SET_AFE(base, ctx, 1);
 275
 276         /* Set up HTW mode */
 277         /* TLB miss configuration: perform HTW on miss */
 278         SET_TLBMCFG(base, ctx, 0x3);
 279
 280         /* V2P configuration: HTW for access */
 281         SET_V2PCFG(base, ctx, 0x3);
 282
 283         SET_TTBCR(base, ctx, priv->cfg.arm_v7s_cfg.tcr);
 284         SET_TTBR0(base, ctx, priv->cfg.arm_v7s_cfg.ttbr[0]);
 285         SET_TTBR1(base, ctx, priv->cfg.arm_v7s_cfg.ttbr[1]);
 286
 287         /* Set prrr and nmrr */
 288         SET_PRRR(base, ctx, priv->cfg.arm_v7s_cfg.prrr);
 289         SET_NMRR(base, ctx, priv->cfg.arm_v7s_cfg.nmrr);
 290
 291         /* Invalidate the TLB for this context */
 292         SET_CTX_TLBIALL(base, ctx, 0);
 293
 294         /* Set interrupt number to "secure" interrupt */
 295         SET_IRPTNDX(base, ctx, 0);
 296
 297         /* Enable context fault interrupt */
 298         SET_CFEIE(base, ctx, 1);
 299
 300         /* Stall access on a context fault and let the handler deal with it */
 301         SET_CFCFG(base, ctx, 1);
 302
 303         /* Redirect all cacheable requests to L2 slave port. */
 304         SET_RCISH(base, ctx, 1);
 305         SET_RCOSH(base, ctx, 1);
 306         SET_RCNSH(base, ctx, 1);
 307
 308         /* Turn on BFB prefetch */
 309         SET_BFBDFE(base, ctx, 1);
 310
 311         /* Enable the MMU */
 312         SET_M(base, ctx, 1);
 313 }
 314
 315 static struct iommu_domain *msm_iommu_domain_alloc(unsigned type)
 316 {
 317         struct msm_priv *priv;
 318
 319         if (type != IOMMU_DOMAIN_UNMANAGED)
 320                 return NULL;
 321
 322         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
 323         if (!priv)
 324                 goto fail_nomem;
 325
 326         INIT_LIST_HEAD(&priv->list_attached);
 327
 328         priv->domain.geometry.aperture_start = 0;
 329         priv->domain.geometry.aperture_end   = (1ULL << 32) - 1;
 330         priv->domain.geometry.force_aperture = true;
 331
 332         return &priv->domain;
 333
 334 fail_nomem:
 335         kfree(priv);
 336         return NULL;
 337 }
 338
 339 static void msm_iommu_domain_free(struct iommu_domain *domain)
 340 {
 341         struct msm_priv *priv;
 342         unsigned long flags;
 343
 344         spin_lock_irqsave(&msm_iommu_lock, flags);
 345         priv = to_msm_priv(domain);
 346         kfree(priv);
 347         spin_unlock_irqrestore(&msm_iommu_lock, flags);
 348 }
 349
 350 static int msm_iommu_domain_config(struct msm_priv *priv)
 351 {
 352         spin_lock_init(&priv->pgtlock);
 353
 354         priv->cfg = (struct io_pgtable_cfg) {
 355                 .quirks = IO_PGTABLE_QUIRK_TLBI_ON_MAP,
 356                 .pgsize_bitmap = msm_iommu_ops.pgsize_bitmap,
 357                 .ias = 32,
 358                 .oas = 32,
 359                 .tlb = &msm_iommu_gather_ops,
 360                 .iommu_dev = priv->dev,
 361         };
 362
 363         priv->iop = alloc_io_pgtable_ops(ARM_V7S, &priv->cfg, priv);
 364         if (!priv->iop) {
 365                 dev_err(priv->dev, "Failed to allocate pgtable\n");
 366                 return -EINVAL;
 367         }
 368
 369         msm_iommu_ops.pgsize_bitmap = priv->cfg.pgsize_bitmap;
 370
 371         return 0;
 372 }
 373
 374 /* Must be called under msm_iommu_lock */
 375 static struct msm_iommu_dev *find_iommu_for_dev(struct device *dev)
 376 {
 377         struct msm_iommu_dev *iommu, *ret = NULL;
 378         struct msm_iommu_ctx_dev *master;
 379
 380         list_for_each_entry(iommu, &qcom_iommu_devices, dev_node) {
 381                 master = list_first_entry(&iommu->ctx_list,
 382                                           struct msm_iommu_ctx_dev,
 383                                           list);
 384                 if (master->of_node == dev->of_node) {
 385                         ret = iommu;
 386                         break;
 387                 }
 388         }
 389
 390         return ret;
 391 }
 392
 393 static int msm_iommu_add_device(struct device *dev)
 394 {
 395         struct msm_iommu_dev *iommu;
 396         struct iommu_group *group;
 397         unsigned long flags;
 398
 399         spin_lock_irqsave(&msm_iommu_lock, flags);
 400         iommu = find_iommu_for_dev(dev);
 401         spin_unlock_irqrestore(&msm_iommu_lock, flags);
 402
 403         if (iommu)
 404                 iommu_device_link(&iommu->iommu, dev);
 405         else
 406                 return -ENODEV;
 407
 408         group = iommu_group_get_for_dev(dev);
 409         if (IS_ERR(group))
 410                 return PTR_ERR(group);
 411
 412         iommu_group_put(group);
 413
 414         return 0;
 415 }
 416
 417 static void msm_iommu_remove_device(struct device *dev)
 418 {
 419         struct msm_iommu_dev *iommu;
 420         unsigned long flags;
 421
 422         spin_lock_irqsave(&msm_iommu_lock, flags);
 423         iommu = find_iommu_for_dev(dev);
 424         spin_unlock_irqrestore(&msm_iommu_lock, flags);
 425
 426         if (iommu)
 427                 iommu_device_unlink(&iommu->iommu, dev);
 428
 429         iommu_group_remove_device(dev);
 430 }
 431
 432 static int msm_iommu_attach_dev(struct iommu_domain *domain, struct device *dev)
 433 {
 434         int ret = 0;
 435         unsigned long flags;
 436         struct msm_iommu_dev *iommu;
 437         struct msm_priv *priv = to_msm_priv(domain);
 438         struct msm_iommu_ctx_dev *master;
 439
 440         priv->dev = dev;
 441         msm_iommu_domain_config(priv);
 442
 443         spin_lock_irqsave(&msm_iommu_lock, flags);
 444         list_for_each_entry(iommu, &qcom_iommu_devices, dev_node) {
 445                 master = list_first_entry(&iommu->ctx_list,
 446                                           struct msm_iommu_ctx_dev,
 447                                           list);
 448                 if (master->of_node == dev->of_node) {
 449                         ret = __enable_clocks(iommu);
 450                         if (ret)
 451                                 goto fail;
 452
 453                         list_for_each_entry(master, &iommu->ctx_list, list) {
 454                                 if (master->num) {
 455                                         dev_err(dev, "domain already attached");
 456                                         ret = -EEXIST;
 457                                         goto fail;
 458                                 }
 459                                 master->num =
 460                                         msm_iommu_alloc_ctx(iommu->context_map,
 461                                                             0, iommu->ncb);
 462                                         if (IS_ERR_VALUE(master->num)) {
 463                                                 ret = -ENODEV;
 464                                                 goto fail;
 465                                         }
 466                                 config_mids(iommu, master);
 467                                 __program_context(iommu->base, master->num,
 468                                                   priv);
 469                         }
 470                         __disable_clocks(iommu);
 471                         list_add(&iommu->dom_node, &priv->list_attached);
 472                 }
 473         }
 474
 475 fail:
 476         spin_unlock_irqrestore(&msm_iommu_lock, flags);
 477
 478         return ret;
 479 }
 480
 481 static void msm_iommu_detach_dev(struct iommu_domain *domain,
 482                                  struct device *dev)
 483 {
 484         struct msm_priv *priv = to_msm_priv(domain);
 485         unsigned long flags;
 486         struct msm_iommu_dev *iommu;
 487         struct msm_iommu_ctx_dev *master;
 488         int ret;
 489
 490         free_io_pgtable_ops(priv->iop);
 491
 492         spin_lock_irqsave(&msm_iommu_lock, flags);
 493         list_for_each_entry(iommu, &priv->list_attached, dom_node) {
 494                 ret = __enable_clocks(iommu);
 495                 if (ret)
 496                         goto fail;
 497
 498                 list_for_each_entry(master, &iommu->ctx_list, list) {
 499                         msm_iommu_free_ctx(iommu->context_map, master->num);
 500                         __reset_context(iommu->base, master->num);
 501                 }
 502                 __disable_clocks(iommu);
 503         }
 504 fail:
 505         spin_unlock_irqrestore(&msm_iommu_lock, flags);
 506 }
 507
 508 static int msm_iommu_map(struct iommu_domain *domain, unsigned long iova,
 509                          phys_addr_t pa, size_t len, int prot)
 510 {
 511         struct msm_priv *priv = to_msm_priv(domain);
 512         unsigned long flags;
 513         int ret;
 514
 515         spin_lock_irqsave(&priv->pgtlock, flags);
 516         ret = priv->iop->map(priv->iop, iova, pa, len, prot);
 517         spin_unlock_irqrestore(&priv->pgtlock, flags);
 518
 519         return ret;
 520 }
 521
 522 static size_t msm_iommu_unmap(struct iommu_domain *domain, unsigned long iova,
 523                               size_t len)
 524 {
 525         struct msm_priv *priv = to_msm_priv(domain);
 526         unsigned long flags;
 527
 528         spin_lock_irqsave(&priv->pgtlock, flags);
 529         len = priv->iop->unmap(priv->iop, iova, len);
 530         spin_unlock_irqrestore(&priv->pgtlock, flags);
 531
 532         return len;
 533 }
 534
 535 static phys_addr_t msm_iommu_iova_to_phys(struct iommu_domain *domain,
 536                                           dma_addr_t va)
 537 {
 538         struct msm_priv *priv;
 539         struct msm_iommu_dev *iommu;
 540         struct msm_iommu_ctx_dev *master;
 541         unsigned int par;
 542         unsigned long flags;
 543         phys_addr_t ret = 0;
 544
 545         spin_lock_irqsave(&msm_iommu_lock, flags);
 546
 547         priv = to_msm_priv(domain);
 548         iommu = list_first_entry(&priv->list_attached,
 549                                  struct msm_iommu_dev, dom_node);
 550
 551         if (list_empty(&iommu->ctx_list))
 552                 goto fail;
 553
 554         master = list_first_entry(&iommu->ctx_list,
 555                                   struct msm_iommu_ctx_dev, list);
 556         if (!master)
 557                 goto fail;
 558
 559         ret = __enable_clocks(iommu);
 560         if (ret)
 561                 goto fail;
 562
 563         /* Invalidate context TLB */
 564         SET_CTX_TLBIALL(iommu->base, master->num, 0);
 565         SET_V2PPR(iommu->base, master->num, va & V2Pxx_VA);
 566
 567         par = GET_PAR(iommu->base, master->num);
 568
 569         /* We are dealing with a supersection */
 570         if (GET_NOFAULT_SS(iommu->base, master->num))
 571                 ret = (par & 0xFF000000) | (va & 0x00FFFFFF);
 572         else    /* Upper 20 bits from PAR, lower 12 from VA */
 573                 ret = (par & 0xFFFFF000) | (va & 0x00000FFF);
 574
 575         if (GET_FAULT(iommu->base, master->num))
 576                 ret = 0;
 577
 578         __disable_clocks(iommu);
 579 fail:
 580         spin_unlock_irqrestore(&msm_iommu_lock, flags);
 581         return ret;
 582 }
 583
 584 static bool msm_iommu_capable(enum iommu_cap cap)
 585 {
 586         return false;
 587 }
 588
 589 static void print_ctx_regs(void __iomem *base, int ctx)
 590 {
 591         unsigned int fsr = GET_FSR(base, ctx);
 592         pr_err("FAR    = %08x    PAR    = %08x\n",
 593                GET_FAR(base, ctx), GET_PAR(base, ctx));
 594         pr_err("FSR    = %08x [%s%s%s%s%s%s%s%s%s%s]\n", fsr,
 595                         (fsr & 0x02) ? "TF " : "",
 596                         (fsr & 0x04) ? "AFF " : "",
 597                         (fsr & 0x08) ? "APF " : "",
 598                         (fsr & 0x10) ? "TLBMF " : "",
 599                         (fsr & 0x20) ? "HTWDEEF " : "",
 600                         (fsr & 0x40) ? "HTWSEEF " : "",
 601                         (fsr & 0x80) ? "MHF " : "",
 602                         (fsr & 0x10000) ? "SL " : "",
 603                         (fsr & 0x40000000) ? "SS " : "",
 604                         (fsr & 0x80000000) ? "MULTI " : "");
 605
 606         pr_err("FSYNR0 = %08x    FSYNR1 = %08x\n",
 607                GET_FSYNR0(base, ctx), GET_FSYNR1(base, ctx));
 608         pr_err("TTBR0  = %08x    TTBR1  = %08x\n",
 609                GET_TTBR0(base, ctx), GET_TTBR1(base, ctx));
 610         pr_err("SCTLR  = %08x    ACTLR  = %08x\n",
 611                GET_SCTLR(base, ctx), GET_ACTLR(base, ctx));
 612 }
 613
 614 static void insert_iommu_master(struct device *dev,
 615                                 struct msm_iommu_dev **iommu,
 616                                 struct of_phandle_args *spec)
 617 {
 618         struct msm_iommu_ctx_dev *master = dev->archdata.iommu;
 619         int sid;
 620
 621         if (list_empty(&(*iommu)->ctx_list)) {
 622                 master = kzalloc(sizeof(*master), GFP_ATOMIC);
 623                 master->of_node = dev->of_node;
 624                 list_add(&master->list, &(*iommu)->ctx_list);
 625                 dev->archdata.iommu = master;
 626         }
 627
 628         for (sid = 0; sid < master->num_mids; sid++)
 629                 if (master->mids[sid] == spec->args[0]) {
 630                         dev_warn(dev, "Stream ID 0x%hx repeated; ignoring\n",
 631                                  sid);
 632                         return;
 633                 }
 634
 635         master->mids[master->num_mids++] = spec->args[0];
 636 }
 637
 638 static int qcom_iommu_of_xlate(struct device *dev,
 639                                struct of_phandle_args *spec)
 640 {
 641         struct msm_iommu_dev *iommu;
 642         unsigned long flags;
 643         int ret = 0;
 644
 645         spin_lock_irqsave(&msm_iommu_lock, flags);
 646         list_for_each_entry(iommu, &qcom_iommu_devices, dev_node)
 647                 if (iommu->dev->of_node == spec->np)
 648                         break;
 649
 650         if (!iommu || iommu->dev->of_node != spec->np) {
 651                 ret = -ENODEV;
 652                 goto fail;
 653         }
 654
 655         insert_iommu_master(dev, &iommu, spec);
 656 fail:
 657         spin_unlock_irqrestore(&msm_iommu_lock, flags);
 658
 659         return ret;
 660 }
 661
 662 irqreturn_t msm_iommu_fault_handler(int irq, void *dev_id)
 663 {
 664         struct msm_iommu_dev *iommu = dev_id;
 665         unsigned int fsr;
 666         int i, ret;
 667
 668         spin_lock(&msm_iommu_lock);
 669
 670         if (!iommu) {
 671                 pr_err("Invalid device ID in context interrupt handler\n");
 672                 goto fail;
 673         }
 674
 675         pr_err("Unexpected IOMMU page fault!\n");
 676         pr_err("base = %08x\n", (unsigned int)iommu->base);
 677
 678         ret = __enable_clocks(iommu);
 679         if (ret)
 680                 goto fail;
 681
 682         for (i = 0; i < iommu->ncb; i++) {
 683                 fsr = GET_FSR(iommu->base, i);
 684                 if (fsr) {
 685                         pr_err("Fault occurred in context %d.\n", i);
 686                         pr_err("Interesting registers:\n");
 687                         print_ctx_regs(iommu->base, i);
 688                         SET_FSR(iommu->base, i, 0x4000000F);
 689                 }
 690         }
 691         __disable_clocks(iommu);
 692 fail:
 693         spin_unlock(&msm_iommu_lock);
 694         return 0;
 695 }
 696
 697 static struct iommu_ops msm_iommu_ops = {
 698         .capable = msm_iommu_capable,
 699         .domain_alloc = msm_iommu_domain_alloc,
 700         .domain_free = msm_iommu_domain_free,
 701         .attach_dev = msm_iommu_attach_dev,
 702         .detach_dev = msm_iommu_detach_dev,
 703         .map = msm_iommu_map,
 704         .unmap = msm_iommu_unmap,
 705         .iova_to_phys = msm_iommu_iova_to_phys,
 706         .add_device = msm_iommu_add_device,
 707         .remove_device = msm_iommu_remove_device,
 708         .device_group = generic_device_group,
 709         .pgsize_bitmap = MSM_IOMMU_PGSIZES,
 710         .of_xlate = qcom_iommu_of_xlate,
 711 };
 712
 713 static int msm_iommu_probe(struct platform_device *pdev)
 714 {
 715         struct resource *r;
 716         resource_size_t ioaddr;
 717         struct msm_iommu_dev *iommu;
 718         int ret, par, val;
 719
 720         iommu = devm_kzalloc(&pdev->dev, sizeof(*iommu), GFP_KERNEL);
 721         if (!iommu)
 722                 return -ENODEV;
 723
 724         iommu->dev = &pdev->dev;
 725         INIT_LIST_HEAD(&iommu->ctx_list);
 726
 727         iommu->pclk = devm_clk_get(iommu->dev, "smmu_pclk");
 728         if (IS_ERR(iommu->pclk)) {
 729                 dev_err(iommu->dev, "could not get smmu_pclk\n");
 730                 return PTR_ERR(iommu->pclk);
 731         }
 732
 733         ret = clk_prepare(iommu->pclk);
 734         if (ret) {
 735                 dev_err(iommu->dev, "could not prepare smmu_pclk\n");
 736                 return ret;
 737         }
 738
 739         iommu->clk = devm_clk_get(iommu->dev, "iommu_clk");
 740         if (IS_ERR(iommu->clk)) {
 741                 dev_err(iommu->dev, "could not get iommu_clk\n");
 742                 clk_unprepare(iommu->pclk);
 743                 return PTR_ERR(iommu->clk);
 744         }
 745
 746         ret = clk_prepare(iommu->clk);
 747         if (ret) {
 748                 dev_err(iommu->dev, "could not prepare iommu_clk\n");
 749                 clk_unprepare(iommu->pclk);
 750                 return ret;
 751         }
 752
 753         r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 754         iommu->base = devm_ioremap_resource(iommu->dev, r);
 755         if (IS_ERR(iommu->base)) {
 756                 dev_err(iommu->dev, "could not get iommu base\n");
 757                 ret = PTR_ERR(iommu->base);
 758                 goto fail;
 759         }
 760         ioaddr = r->start;
 761
 762         iommu->irq = platform_get_irq(pdev, 0);
 763         if (iommu->irq < 0) {
 764                 dev_err(iommu->dev, "could not get iommu irq\n");
 765                 ret = -ENODEV;
 766                 goto fail;
 767         }
 768
 769         ret = of_property_read_u32(iommu->dev->of_node, "qcom,ncb", &val);
 770         if (ret) {
 771                 dev_err(iommu->dev, "could not get ncb\n");
 772                 goto fail;
 773         }
 774         iommu->ncb = val;
 775
 776         msm_iommu_reset(iommu->base, iommu->ncb);
 777         SET_M(iommu->base, 0, 1);
 778         SET_PAR(iommu->base, 0, 0);
 779         SET_V2PCFG(iommu->base, 0, 1);
 780         SET_V2PPR(iommu->base, 0, 0);
 781         par = GET_PAR(iommu->base, 0);
 782         SET_V2PCFG(iommu->base, 0, 0);
 783         SET_M(iommu->base, 0, 0);
 784
 785         if (!par) {
 786                 pr_err("Invalid PAR value detected\n");
 787                 ret = -ENODEV;
 788                 goto fail;
 789         }
 790
 791         ret = devm_request_threaded_irq(iommu->dev, iommu->irq, NULL,
 792                                         msm_iommu_fault_handler,
 793                                         IRQF_ONESHOT | IRQF_SHARED,
 794                                         "msm_iommu_secure_irpt_handler",
 795                                         iommu);
 796         if (ret) {
 797                 pr_err("Request IRQ %d failed with ret=%d\n", iommu->irq, ret);
 798                 goto fail;
 799         }
 800
 801         list_add(&iommu->dev_node, &qcom_iommu_devices);
 802
 803         ret = iommu_device_sysfs_add(&iommu->iommu, iommu->dev, NULL,
 804                                      "msm-smmu.%pa", &ioaddr);
 805         if (ret) {
 806                 pr_err("Could not add msm-smmu at %pa to sysfs\n", &ioaddr);
 807                 goto fail;
 808         }
 809
 810         iommu_device_set_ops(&iommu->iommu, &msm_iommu_ops);
 811         iommu_device_set_fwnode(&iommu->iommu, &pdev->dev.of_node->fwnode);
 812
 813         ret = iommu_device_register(&iommu->iommu);
 814         if (ret) {
 815                 pr_err("Could not register msm-smmu at %pa\n", &ioaddr);
 816                 goto fail;
 817         }
 818
 819         bus_set_iommu(&platform_bus_type, &msm_iommu_ops);
 820
 821         pr_info("device mapped at %p, irq %d with %d ctx banks\n",
 822                 iommu->base, iommu->irq, iommu->ncb);
 823
 824         return ret;
 825 fail:
 826         clk_unprepare(iommu->clk);
 827         clk_unprepare(iommu->pclk);
 828         return ret;
 829 }
 830
 831 static const struct of_device_id msm_iommu_dt_match[] = {
 832         { .compatible = "qcom,apq8064-iommu" },
 833         {}
 834 };
 835
 836 static int msm_iommu_remove(struct platform_device *pdev)
 837 {
 838         struct msm_iommu_dev *iommu = platform_get_drvdata(pdev);
 839
 840         clk_unprepare(iommu->clk);
 841         clk_unprepare(iommu->pclk);
 842         return 0;
 843 }
 844
 845 static struct platform_driver msm_iommu_driver = {
 846         .driver = {
 847                 .name   = "msm_iommu",
 848                 .of_match_table = msm_iommu_dt_match,
 849         },
 850         .probe          = msm_iommu_probe,
 851         .remove         = msm_iommu_remove,
 852 };
 853
 854 static int __init msm_iommu_driver_init(void)
 855 {
 856         int ret;
 857
 858         ret = platform_driver_register(&msm_iommu_driver);
 859         if (ret != 0)
 860                 pr_err("Failed to register IOMMU driver\n");
 861
 862         return ret;
 863 }
 864
 865 static void __exit msm_iommu_driver_exit(void)
 866 {
 867         platform_driver_unregister(&msm_iommu_driver);
 868 }
 869
 870 subsys_initcall(msm_iommu_driver_init);
 871 module_exit(msm_iommu_driver_exit);
 872
 873 MODULE_LICENSE("GPL v2");
 874 MODULE_AUTHOR("Stepan Moskovchenko <stepanm@codeaurora.org>");