1 /* Copyright (c) 2010-2011, Code Aurora Forum. All rights reserved. 2 * 3 * Author: Stepan Moskovchenko <stepanm@codeaurora.org> 4 * 5 * This program is free software; you can redistribute it and/or modify 6 * it under the terms of the GNU General Public License version 2 and 7 * only version 2 as published by the Free Software Foundation. 8 * 9 * This program is distributed in the hope that it will be useful, 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 12 * GNU General Public License for more details. 13 * 14 * You should have received a copy of the GNU General Public License 15 * along with this program; if not, write to the Free Software 16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 17 * 02110-1301, USA. 18 */ 19 20 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 21 #include <linux/kernel.h> 22 #include <linux/init.h> 23 #include <linux/platform_device.h> 24 #include <linux/errno.h> 25 #include <linux/io.h> 26 #include <linux/io-pgtable.h> 27 #include <linux/interrupt.h> 28 #include <linux/list.h> 29 #include <linux/spinlock.h> 30 #include <linux/slab.h> 31 #include <linux/iommu.h> 32 #include <linux/clk.h> 33 #include <linux/err.h> 34 #include <linux/of_iommu.h> 35 36 #include <asm/cacheflush.h> 37 #include <asm/sizes.h> 38 39 #include "msm_iommu_hw-8xxx.h" 40 #include "msm_iommu.h" 41 42 #define MRC(reg, processor, op1, crn, crm, op2) \ 43 __asm__ __volatile__ ( \ 44 " mrc " #processor "," #op1 ", %0," #crn "," #crm "," #op2 "\n" \ 45 : "=r" (reg)) 46 47 /* bitmap of the page sizes currently supported */ 48 #define MSM_IOMMU_PGSIZES (SZ_4K | SZ_64K | SZ_1M | SZ_16M) 49 50 DEFINE_SPINLOCK(msm_iommu_lock); 51 static LIST_HEAD(qcom_iommu_devices); 52 static struct iommu_ops msm_iommu_ops; 53 54 struct msm_priv { 55 struct list_head list_attached; 56 struct iommu_domain domain; 57 struct io_pgtable_cfg cfg; 58 struct io_pgtable_ops *iop; 59 struct device *dev; 60 spinlock_t pgtlock; /* pagetable lock */ 61 }; 62 63 static struct msm_priv *to_msm_priv(struct iommu_domain *dom) 64 { 65 return container_of(dom, struct msm_priv, domain); 66 } 67 68 static int __enable_clocks(struct msm_iommu_dev *iommu) 69 { 70 int ret; 71 72 ret = clk_enable(iommu->pclk); 73 if (ret) 74 goto fail; 75 76 if (iommu->clk) { 77 ret = clk_enable(iommu->clk); 78 if (ret) 79 clk_disable(iommu->pclk); 80 } 81 fail: 82 return ret; 83 } 84 85 static void __disable_clocks(struct msm_iommu_dev *iommu) 86 { 87 if (iommu->clk) 88 clk_disable(iommu->clk); 89 clk_disable(iommu->pclk); 90 } 91 92 static void msm_iommu_reset(void __iomem *base, int ncb) 93 { 94 int ctx; 95 96 SET_RPUE(base, 0); 97 SET_RPUEIE(base, 0); 98 SET_ESRRESTORE(base, 0); 99 SET_TBE(base, 0); 100 SET_CR(base, 0); 101 SET_SPDMBE(base, 0); 102 SET_TESTBUSCR(base, 0); 103 SET_TLBRSW(base, 0); 104 SET_GLOBAL_TLBIALL(base, 0); 105 SET_RPU_ACR(base, 0); 106 SET_TLBLKCRWE(base, 1); 107 108 for (ctx = 0; ctx < ncb; ctx++) { 109 SET_BPRCOSH(base, ctx, 0); 110 SET_BPRCISH(base, ctx, 0); 111 SET_BPRCNSH(base, ctx, 0); 112 SET_BPSHCFG(base, ctx, 0); 113 SET_BPMTCFG(base, ctx, 0); 114 SET_ACTLR(base, ctx, 0); 115 SET_SCTLR(base, ctx, 0); 116 SET_FSRRESTORE(base, ctx, 0); 117 SET_TTBR0(base, ctx, 0); 118 SET_TTBR1(base, ctx, 0); 119 SET_TTBCR(base, ctx, 0); 120 SET_BFBCR(base, ctx, 0); 121 SET_PAR(base, ctx, 0); 122 SET_FAR(base, ctx, 0); 123 SET_CTX_TLBIALL(base, ctx, 0); 124 SET_TLBFLPTER(base, ctx, 0); 125 SET_TLBSLPTER(base, ctx, 0); 126 SET_TLBLKCR(base, ctx, 0); 127 SET_CONTEXTIDR(base, ctx, 0); 128 } 129 } 130 131 static void __flush_iotlb(void *cookie) 132 { 133 struct msm_priv *priv = cookie; 134 struct msm_iommu_dev *iommu = NULL; 135 struct msm_iommu_ctx_dev *master; 136 int ret = 0; 137 138 list_for_each_entry(iommu, &priv->list_attached, dom_node) { 139 ret = __enable_clocks(iommu); 140 if (ret) 141 goto fail; 142 143 list_for_each_entry(master, &iommu->ctx_list, list) 144 SET_CTX_TLBIALL(iommu->base, master->num, 0); 145 146 __disable_clocks(iommu); 147 } 148 fail: 149 return; 150 } 151 152 static void __flush_iotlb_range(unsigned long iova, size_t size, 153 size_t granule, bool leaf, void *cookie) 154 { 155 struct msm_priv *priv = cookie; 156 struct msm_iommu_dev *iommu = NULL; 157 struct msm_iommu_ctx_dev *master; 158 int ret = 0; 159 int temp_size; 160 161 list_for_each_entry(iommu, &priv->list_attached, dom_node) { 162 ret = __enable_clocks(iommu); 163 if (ret) 164 goto fail; 165 166 list_for_each_entry(master, &iommu->ctx_list, list) { 167 temp_size = size; 168 do { 169 iova &= TLBIVA_VA; 170 iova |= GET_CONTEXTIDR_ASID(iommu->base, 171 master->num); 172 SET_TLBIVA(iommu->base, master->num, iova); 173 iova += granule; 174 } while (temp_size -= granule); 175 } 176 177 __disable_clocks(iommu); 178 } 179 180 fail: 181 return; 182 } 183 184 static void __flush_iotlb_sync(void *cookie) 185 { 186 /* 187 * Nothing is needed here, the barrier to guarantee 188 * completion of the tlb sync operation is implicitly 189 * taken care when the iommu client does a writel before 190 * kick starting the other master. 191 */ 192 } 193 194 static const struct iommu_gather_ops msm_iommu_gather_ops = { 195 .tlb_flush_all = __flush_iotlb, 196 .tlb_add_flush = __flush_iotlb_range, 197 .tlb_sync = __flush_iotlb_sync, 198 }; 199 200 static int msm_iommu_alloc_ctx(unsigned long *map, int start, int end) 201 { 202 int idx; 203 204 do { 205 idx = find_next_zero_bit(map, end, start); 206 if (idx == end) 207 return -ENOSPC; 208 } while (test_and_set_bit(idx, map)); 209 210 return idx; 211 } 212 213 static void msm_iommu_free_ctx(unsigned long *map, int idx) 214 { 215 clear_bit(idx, map); 216 } 217 218 static void config_mids(struct msm_iommu_dev *iommu, 219 struct msm_iommu_ctx_dev *master) 220 { 221 int mid, ctx, i; 222 223 for (i = 0; i < master->num_mids; i++) { 224 mid = master->mids[i]; 225 ctx = master->num; 226 227 SET_M2VCBR_N(iommu->base, mid, 0); 228 SET_CBACR_N(iommu->base, ctx, 0); 229 230 /* Set VMID = 0 */ 231 SET_VMID(iommu->base, mid, 0); 232 233 /* Set the context number for that MID to this context */ 234 SET_CBNDX(iommu->base, mid, ctx); 235 236 /* Set MID associated with this context bank to 0*/ 237 SET_CBVMID(iommu->base, ctx, 0); 238 239 /* Set the ASID for TLB tagging for this context */ 240 SET_CONTEXTIDR_ASID(iommu->base, ctx, ctx); 241 242 /* Set security bit override to be Non-secure */ 243 SET_NSCFG(iommu->base, mid, 3); 244 } 245 } 246 247 static void __reset_context(void __iomem *base, int ctx) 248 { 249 SET_BPRCOSH(base, ctx, 0); 250 SET_BPRCISH(base, ctx, 0); 251 SET_BPRCNSH(base, ctx, 0); 252 SET_BPSHCFG(base, ctx, 0); 253 SET_BPMTCFG(base, ctx, 0); 254 SET_ACTLR(base, ctx, 0); 255 SET_SCTLR(base, ctx, 0); 256 SET_FSRRESTORE(base, ctx, 0); 257 SET_TTBR0(base, ctx, 0); 258 SET_TTBR1(base, ctx, 0); 259 SET_TTBCR(base, ctx, 0); 260 SET_BFBCR(base, ctx, 0); 261 SET_PAR(base, ctx, 0); 262 SET_FAR(base, ctx, 0); 263 SET_CTX_TLBIALL(base, ctx, 0); 264 SET_TLBFLPTER(base, ctx, 0); 265 SET_TLBSLPTER(base, ctx, 0); 266 SET_TLBLKCR(base, ctx, 0); 267 } 268 269 static void __program_context(void __iomem *base, int ctx, 270 struct msm_priv *priv) 271 { 272 __reset_context(base, ctx); 273 274 /* Turn on TEX Remap */ 275 SET_TRE(base, ctx, 1); 276 SET_AFE(base, ctx, 1); 277 278 /* Set up HTW mode */ 279 /* TLB miss configuration: perform HTW on miss */ 280 SET_TLBMCFG(base, ctx, 0x3); 281 282 /* V2P configuration: HTW for access */ 283 SET_V2PCFG(base, ctx, 0x3); 284 285 SET_TTBCR(base, ctx, priv->cfg.arm_v7s_cfg.tcr); 286 SET_TTBR0(base, ctx, priv->cfg.arm_v7s_cfg.ttbr[0]); 287 SET_TTBR1(base, ctx, priv->cfg.arm_v7s_cfg.ttbr[1]); 288 289 /* Set prrr and nmrr */ 290 SET_PRRR(base, ctx, priv->cfg.arm_v7s_cfg.prrr); 291 SET_NMRR(base, ctx, priv->cfg.arm_v7s_cfg.nmrr); 292 293 /* Invalidate the TLB for this context */ 294 SET_CTX_TLBIALL(base, ctx, 0); 295 296 /* Set interrupt number to "secure" interrupt */ 297 SET_IRPTNDX(base, ctx, 0); 298 299 /* Enable context fault interrupt */ 300 SET_CFEIE(base, ctx, 1); 301 302 /* Stall access on a context fault and let the handler deal with it */ 303 SET_CFCFG(base, ctx, 1); 304 305 /* Redirect all cacheable requests to L2 slave port. */ 306 SET_RCISH(base, ctx, 1); 307 SET_RCOSH(base, ctx, 1); 308 SET_RCNSH(base, ctx, 1); 309 310 /* Turn on BFB prefetch */ 311 SET_BFBDFE(base, ctx, 1); 312 313 /* Enable the MMU */ 314 SET_M(base, ctx, 1); 315 } 316 317 static struct iommu_domain *msm_iommu_domain_alloc(unsigned type) 318 { 319 struct msm_priv *priv; 320 321 if (type != IOMMU_DOMAIN_UNMANAGED) 322 return NULL; 323 324 priv = kzalloc(sizeof(*priv), GFP_KERNEL); 325 if (!priv) 326 goto fail_nomem; 327 328 INIT_LIST_HEAD(&priv->list_attached); 329 330 priv->domain.geometry.aperture_start = 0; 331 priv->domain.geometry.aperture_end = (1ULL << 32) - 1; 332 priv->domain.geometry.force_aperture = true; 333 334 return &priv->domain; 335 336 fail_nomem: 337 kfree(priv); 338 return NULL; 339 } 340 341 static void msm_iommu_domain_free(struct iommu_domain *domain) 342 { 343 struct msm_priv *priv; 344 unsigned long flags; 345 346 spin_lock_irqsave(&msm_iommu_lock, flags); 347 priv = to_msm_priv(domain); 348 kfree(priv); 349 spin_unlock_irqrestore(&msm_iommu_lock, flags); 350 } 351 352 static int msm_iommu_domain_config(struct msm_priv *priv) 353 { 354 spin_lock_init(&priv->pgtlock); 355 356 priv->cfg = (struct io_pgtable_cfg) { 357 .quirks = IO_PGTABLE_QUIRK_TLBI_ON_MAP, 358 .pgsize_bitmap = msm_iommu_ops.pgsize_bitmap, 359 .ias = 32, 360 .oas = 32, 361 .tlb = &msm_iommu_gather_ops, 362 .iommu_dev = priv->dev, 363 }; 364 365 priv->iop = alloc_io_pgtable_ops(ARM_V7S, &priv->cfg, priv); 366 if (!priv->iop) { 367 dev_err(priv->dev, "Failed to allocate pgtable\n"); 368 return -EINVAL; 369 } 370 371 msm_iommu_ops.pgsize_bitmap = priv->cfg.pgsize_bitmap; 372 373 return 0; 374 } 375 376 /* Must be called under msm_iommu_lock */ 377 static struct msm_iommu_dev *find_iommu_for_dev(struct device *dev) 378 { 379 struct msm_iommu_dev *iommu, *ret = NULL; 380 struct msm_iommu_ctx_dev *master; 381 382 list_for_each_entry(iommu, &qcom_iommu_devices, dev_node) { 383 master = list_first_entry(&iommu->ctx_list, 384 struct msm_iommu_ctx_dev, 385 list); 386 if (master->of_node == dev->of_node) { 387 ret = iommu; 388 break; 389 } 390 } 391 392 return ret; 393 } 394 395 static int msm_iommu_add_device(struct device *dev) 396 { 397 struct msm_iommu_dev *iommu; 398 struct iommu_group *group; 399 unsigned long flags; 400 401 spin_lock_irqsave(&msm_iommu_lock, flags); 402 iommu = find_iommu_for_dev(dev); 403 spin_unlock_irqrestore(&msm_iommu_lock, flags); 404 405 if (iommu) 406 iommu_device_link(&iommu->iommu, dev); 407 else 408 return -ENODEV; 409 410 group = iommu_group_get_for_dev(dev); 411 if (IS_ERR(group)) 412 return PTR_ERR(group); 413 414 iommu_group_put(group); 415 416 return 0; 417 } 418 419 static void msm_iommu_remove_device(struct device *dev) 420 { 421 struct msm_iommu_dev *iommu; 422 unsigned long flags; 423 424 spin_lock_irqsave(&msm_iommu_lock, flags); 425 iommu = find_iommu_for_dev(dev); 426 spin_unlock_irqrestore(&msm_iommu_lock, flags); 427 428 if (iommu) 429 iommu_device_unlink(&iommu->iommu, dev); 430 431 iommu_group_remove_device(dev); 432 } 433 434 static int msm_iommu_attach_dev(struct iommu_domain *domain, struct device *dev) 435 { 436 int ret = 0; 437 unsigned long flags; 438 struct msm_iommu_dev *iommu; 439 struct msm_priv *priv = to_msm_priv(domain); 440 struct msm_iommu_ctx_dev *master; 441 442 priv->dev = dev; 443 msm_iommu_domain_config(priv); 444 445 spin_lock_irqsave(&msm_iommu_lock, flags); 446 list_for_each_entry(iommu, &qcom_iommu_devices, dev_node) { 447 master = list_first_entry(&iommu->ctx_list, 448 struct msm_iommu_ctx_dev, 449 list); 450 if (master->of_node == dev->of_node) { 451 ret = __enable_clocks(iommu); 452 if (ret) 453 goto fail; 454 455 list_for_each_entry(master, &iommu->ctx_list, list) { 456 if (master->num) { 457 dev_err(dev, "domain already attached"); 458 ret = -EEXIST; 459 goto fail; 460 } 461 master->num = 462 msm_iommu_alloc_ctx(iommu->context_map, 463 0, iommu->ncb); 464 if (IS_ERR_VALUE(master->num)) { 465 ret = -ENODEV; 466 goto fail; 467 } 468 config_mids(iommu, master); 469 __program_context(iommu->base, master->num, 470 priv); 471 } 472 __disable_clocks(iommu); 473 list_add(&iommu->dom_node, &priv->list_attached); 474 } 475 } 476 477 fail: 478 spin_unlock_irqrestore(&msm_iommu_lock, flags); 479 480 return ret; 481 } 482 483 static void msm_iommu_detach_dev(struct iommu_domain *domain, 484 struct device *dev) 485 { 486 struct msm_priv *priv = to_msm_priv(domain); 487 unsigned long flags; 488 struct msm_iommu_dev *iommu; 489 struct msm_iommu_ctx_dev *master; 490 int ret; 491 492 free_io_pgtable_ops(priv->iop); 493 494 spin_lock_irqsave(&msm_iommu_lock, flags); 495 list_for_each_entry(iommu, &priv->list_attached, dom_node) { 496 ret = __enable_clocks(iommu); 497 if (ret) 498 goto fail; 499 500 list_for_each_entry(master, &iommu->ctx_list, list) { 501 msm_iommu_free_ctx(iommu->context_map, master->num); 502 __reset_context(iommu->base, master->num); 503 } 504 __disable_clocks(iommu); 505 } 506 fail: 507 spin_unlock_irqrestore(&msm_iommu_lock, flags); 508 } 509 510 static int msm_iommu_map(struct iommu_domain *domain, unsigned long iova, 511 phys_addr_t pa, size_t len, int prot) 512 { 513 struct msm_priv *priv = to_msm_priv(domain); 514 unsigned long flags; 515 int ret; 516 517 spin_lock_irqsave(&priv->pgtlock, flags); 518 ret = priv->iop->map(priv->iop, iova, pa, len, prot); 519 spin_unlock_irqrestore(&priv->pgtlock, flags); 520 521 return ret; 522 } 523 524 static size_t msm_iommu_unmap(struct iommu_domain *domain, unsigned long iova, 525 size_t len) 526 { 527 struct msm_priv *priv = to_msm_priv(domain); 528 unsigned long flags; 529 530 spin_lock_irqsave(&priv->pgtlock, flags); 531 len = priv->iop->unmap(priv->iop, iova, len); 532 spin_unlock_irqrestore(&priv->pgtlock, flags); 533 534 return len; 535 } 536 537 static phys_addr_t msm_iommu_iova_to_phys(struct iommu_domain *domain, 538 dma_addr_t va) 539 { 540 struct msm_priv *priv; 541 struct msm_iommu_dev *iommu; 542 struct msm_iommu_ctx_dev *master; 543 unsigned int par; 544 unsigned long flags; 545 phys_addr_t ret = 0; 546 547 spin_lock_irqsave(&msm_iommu_lock, flags); 548 549 priv = to_msm_priv(domain); 550 iommu = list_first_entry(&priv->list_attached, 551 struct msm_iommu_dev, dom_node); 552 553 if (list_empty(&iommu->ctx_list)) 554 goto fail; 555 556 master = list_first_entry(&iommu->ctx_list, 557 struct msm_iommu_ctx_dev, list); 558 if (!master) 559 goto fail; 560 561 ret = __enable_clocks(iommu); 562 if (ret) 563 goto fail; 564 565 /* Invalidate context TLB */ 566 SET_CTX_TLBIALL(iommu->base, master->num, 0); 567 SET_V2PPR(iommu->base, master->num, va & V2Pxx_VA); 568 569 par = GET_PAR(iommu->base, master->num); 570 571 /* We are dealing with a supersection */ 572 if (GET_NOFAULT_SS(iommu->base, master->num)) 573 ret = (par & 0xFF000000) | (va & 0x00FFFFFF); 574 else /* Upper 20 bits from PAR, lower 12 from VA */ 575 ret = (par & 0xFFFFF000) | (va & 0x00000FFF); 576 577 if (GET_FAULT(iommu->base, master->num)) 578 ret = 0; 579 580 __disable_clocks(iommu); 581 fail: 582 spin_unlock_irqrestore(&msm_iommu_lock, flags); 583 return ret; 584 } 585 586 static bool msm_iommu_capable(enum iommu_cap cap) 587 { 588 return false; 589 } 590 591 static void print_ctx_regs(void __iomem *base, int ctx) 592 { 593 unsigned int fsr = GET_FSR(base, ctx); 594 pr_err("FAR = %08x PAR = %08x\n", 595 GET_FAR(base, ctx), GET_PAR(base, ctx)); 596 pr_err("FSR = %08x [%s%s%s%s%s%s%s%s%s%s]\n", fsr, 597 (fsr & 0x02) ? "TF " : "", 598 (fsr & 0x04) ? "AFF " : "", 599 (fsr & 0x08) ? "APF " : "", 600 (fsr & 0x10) ? "TLBMF " : "", 601 (fsr & 0x20) ? "HTWDEEF " : "", 602 (fsr & 0x40) ? "HTWSEEF " : "", 603 (fsr & 0x80) ? "MHF " : "", 604 (fsr & 0x10000) ? "SL " : "", 605 (fsr & 0x40000000) ? "SS " : "", 606 (fsr & 0x80000000) ? "MULTI " : ""); 607 608 pr_err("FSYNR0 = %08x FSYNR1 = %08x\n", 609 GET_FSYNR0(base, ctx), GET_FSYNR1(base, ctx)); 610 pr_err("TTBR0 = %08x TTBR1 = %08x\n", 611 GET_TTBR0(base, ctx), GET_TTBR1(base, ctx)); 612 pr_err("SCTLR = %08x ACTLR = %08x\n", 613 GET_SCTLR(base, ctx), GET_ACTLR(base, ctx)); 614 } 615 616 static void insert_iommu_master(struct device *dev, 617 struct msm_iommu_dev **iommu, 618 struct of_phandle_args *spec) 619 { 620 struct msm_iommu_ctx_dev *master = dev->archdata.iommu; 621 int sid; 622 623 if (list_empty(&(*iommu)->ctx_list)) { 624 master = kzalloc(sizeof(*master), GFP_ATOMIC); 625 master->of_node = dev->of_node; 626 list_add(&master->list, &(*iommu)->ctx_list); 627 dev->archdata.iommu = master; 628 } 629 630 for (sid = 0; sid < master->num_mids; sid++) 631 if (master->mids[sid] == spec->args[0]) { 632 dev_warn(dev, "Stream ID 0x%hx repeated; ignoring\n", 633 sid); 634 return; 635 } 636 637 master->mids[master->num_mids++] = spec->args[0]; 638 } 639 640 static int qcom_iommu_of_xlate(struct device *dev, 641 struct of_phandle_args *spec) 642 { 643 struct msm_iommu_dev *iommu; 644 unsigned long flags; 645 int ret = 0; 646 647 spin_lock_irqsave(&msm_iommu_lock, flags); 648 list_for_each_entry(iommu, &qcom_iommu_devices, dev_node) 649 if (iommu->dev->of_node == spec->np) 650 break; 651 652 if (!iommu || iommu->dev->of_node != spec->np) { 653 ret = -ENODEV; 654 goto fail; 655 } 656 657 insert_iommu_master(dev, &iommu, spec); 658 fail: 659 spin_unlock_irqrestore(&msm_iommu_lock, flags); 660 661 return ret; 662 } 663 664 irqreturn_t msm_iommu_fault_handler(int irq, void *dev_id) 665 { 666 struct msm_iommu_dev *iommu = dev_id; 667 unsigned int fsr; 668 int i, ret; 669 670 spin_lock(&msm_iommu_lock); 671 672 if (!iommu) { 673 pr_err("Invalid device ID in context interrupt handler\n"); 674 goto fail; 675 } 676 677 pr_err("Unexpected IOMMU page fault!\n"); 678 pr_err("base = %08x\n", (unsigned int)iommu->base); 679 680 ret = __enable_clocks(iommu); 681 if (ret) 682 goto fail; 683 684 for (i = 0; i < iommu->ncb; i++) { 685 fsr = GET_FSR(iommu->base, i); 686 if (fsr) { 687 pr_err("Fault occurred in context %d.\n", i); 688 pr_err("Interesting registers:\n"); 689 print_ctx_regs(iommu->base, i); 690 SET_FSR(iommu->base, i, 0x4000000F); 691 } 692 } 693 __disable_clocks(iommu); 694 fail: 695 spin_unlock(&msm_iommu_lock); 696 return 0; 697 } 698 699 static struct iommu_ops msm_iommu_ops = { 700 .capable = msm_iommu_capable, 701 .domain_alloc = msm_iommu_domain_alloc, 702 .domain_free = msm_iommu_domain_free, 703 .attach_dev = msm_iommu_attach_dev, 704 .detach_dev = msm_iommu_detach_dev, 705 .map = msm_iommu_map, 706 .unmap = msm_iommu_unmap, 707 .iova_to_phys = msm_iommu_iova_to_phys, 708 .add_device = msm_iommu_add_device, 709 .remove_device = msm_iommu_remove_device, 710 .device_group = generic_device_group, 711 .pgsize_bitmap = MSM_IOMMU_PGSIZES, 712 .of_xlate = qcom_iommu_of_xlate, 713 }; 714 715 static int msm_iommu_probe(struct platform_device *pdev) 716 { 717 struct resource *r; 718 resource_size_t ioaddr; 719 struct msm_iommu_dev *iommu; 720 int ret, par, val; 721 722 iommu = devm_kzalloc(&pdev->dev, sizeof(*iommu), GFP_KERNEL); 723 if (!iommu) 724 return -ENODEV; 725 726 iommu->dev = &pdev->dev; 727 INIT_LIST_HEAD(&iommu->ctx_list); 728 729 iommu->pclk = devm_clk_get(iommu->dev, "smmu_pclk"); 730 if (IS_ERR(iommu->pclk)) { 731 dev_err(iommu->dev, "could not get smmu_pclk\n"); 732 return PTR_ERR(iommu->pclk); 733 } 734 735 ret = clk_prepare(iommu->pclk); 736 if (ret) { 737 dev_err(iommu->dev, "could not prepare smmu_pclk\n"); 738 return ret; 739 } 740 741 iommu->clk = devm_clk_get(iommu->dev, "iommu_clk"); 742 if (IS_ERR(iommu->clk)) { 743 dev_err(iommu->dev, "could not get iommu_clk\n"); 744 clk_unprepare(iommu->pclk); 745 return PTR_ERR(iommu->clk); 746 } 747 748 ret = clk_prepare(iommu->clk); 749 if (ret) { 750 dev_err(iommu->dev, "could not prepare iommu_clk\n"); 751 clk_unprepare(iommu->pclk); 752 return ret; 753 } 754 755 r = platform_get_resource(pdev, IORESOURCE_MEM, 0); 756 iommu->base = devm_ioremap_resource(iommu->dev, r); 757 if (IS_ERR(iommu->base)) { 758 dev_err(iommu->dev, "could not get iommu base\n"); 759 ret = PTR_ERR(iommu->base); 760 goto fail; 761 } 762 ioaddr = r->start; 763 764 iommu->irq = platform_get_irq(pdev, 0); 765 if (iommu->irq < 0) { 766 dev_err(iommu->dev, "could not get iommu irq\n"); 767 ret = -ENODEV; 768 goto fail; 769 } 770 771 ret = of_property_read_u32(iommu->dev->of_node, "qcom,ncb", &val); 772 if (ret) { 773 dev_err(iommu->dev, "could not get ncb\n"); 774 goto fail; 775 } 776 iommu->ncb = val; 777 778 msm_iommu_reset(iommu->base, iommu->ncb); 779 SET_M(iommu->base, 0, 1); 780 SET_PAR(iommu->base, 0, 0); 781 SET_V2PCFG(iommu->base, 0, 1); 782 SET_V2PPR(iommu->base, 0, 0); 783 par = GET_PAR(iommu->base, 0); 784 SET_V2PCFG(iommu->base, 0, 0); 785 SET_M(iommu->base, 0, 0); 786 787 if (!par) { 788 pr_err("Invalid PAR value detected\n"); 789 ret = -ENODEV; 790 goto fail; 791 } 792 793 ret = devm_request_threaded_irq(iommu->dev, iommu->irq, NULL, 794 msm_iommu_fault_handler, 795 IRQF_ONESHOT | IRQF_SHARED, 796 "msm_iommu_secure_irpt_handler", 797 iommu); 798 if (ret) { 799 pr_err("Request IRQ %d failed with ret=%d\n", iommu->irq, ret); 800 goto fail; 801 } 802 803 list_add(&iommu->dev_node, &qcom_iommu_devices); 804 805 ret = iommu_device_sysfs_add(&iommu->iommu, iommu->dev, NULL, 806 "msm-smmu.%pa", &ioaddr); 807 if (ret) { 808 pr_err("Could not add msm-smmu at %pa to sysfs\n", &ioaddr); 809 goto fail; 810 } 811 812 iommu_device_set_ops(&iommu->iommu, &msm_iommu_ops); 813 iommu_device_set_fwnode(&iommu->iommu, &pdev->dev.of_node->fwnode); 814 815 ret = iommu_device_register(&iommu->iommu); 816 if (ret) { 817 pr_err("Could not register msm-smmu at %pa\n", &ioaddr); 818 goto fail; 819 } 820 821 bus_set_iommu(&platform_bus_type, &msm_iommu_ops); 822 823 pr_info("device mapped at %p, irq %d with %d ctx banks\n", 824 iommu->base, iommu->irq, iommu->ncb); 825 826 return ret; 827 fail: 828 clk_unprepare(iommu->clk); 829 clk_unprepare(iommu->pclk); 830 return ret; 831 } 832 833 static const struct of_device_id msm_iommu_dt_match[] = { 834 { .compatible = "qcom,apq8064-iommu" }, 835 {} 836 }; 837 838 static int msm_iommu_remove(struct platform_device *pdev) 839 { 840 struct msm_iommu_dev *iommu = platform_get_drvdata(pdev); 841 842 clk_unprepare(iommu->clk); 843 clk_unprepare(iommu->pclk); 844 return 0; 845 } 846 847 static struct platform_driver msm_iommu_driver = { 848 .driver = { 849 .name = "msm_iommu", 850 .of_match_table = msm_iommu_dt_match, 851 }, 852 .probe = msm_iommu_probe, 853 .remove = msm_iommu_remove, 854 }; 855 856 static int __init msm_iommu_driver_init(void) 857 { 858 int ret; 859 860 ret = platform_driver_register(&msm_iommu_driver); 861 if (ret != 0) 862 pr_err("Failed to register IOMMU driver\n"); 863 864 return ret; 865 } 866 subsys_initcall(msm_iommu_driver_init); 867 868