1 /* 2 * omap iommu: tlb and pagetable primitives 3 * 4 * Copyright (C) 2008-2010 Nokia Corporation 5 * Copyright (C) 2013-2017 Texas Instruments Incorporated - http://www.ti.com/ 6 * 7 * Written by Hiroshi DOYU <Hiroshi.DOYU@nokia.com>, 8 * Paul Mundt and Toshihiro Kobayashi 9 * 10 * This program is free software; you can redistribute it and/or modify 11 * it under the terms of the GNU General Public License version 2 as 12 * published by the Free Software Foundation. 13 */ 14 15 #include <linux/dma-mapping.h> 16 #include <linux/err.h> 17 #include <linux/slab.h> 18 #include <linux/interrupt.h> 19 #include <linux/ioport.h> 20 #include <linux/platform_device.h> 21 #include <linux/iommu.h> 22 #include <linux/omap-iommu.h> 23 #include <linux/mutex.h> 24 #include <linux/spinlock.h> 25 #include <linux/io.h> 26 #include <linux/pm_runtime.h> 27 #include <linux/of.h> 28 #include <linux/of_iommu.h> 29 #include <linux/of_irq.h> 30 #include <linux/of_platform.h> 31 #include <linux/regmap.h> 32 #include <linux/mfd/syscon.h> 33 34 #include <linux/platform_data/iommu-omap.h> 35 36 #include "omap-iopgtable.h" 37 #include "omap-iommu.h" 38 39 static const struct iommu_ops omap_iommu_ops; 40 41 #define to_iommu(dev) \ 42 ((struct omap_iommu *)platform_get_drvdata(to_platform_device(dev))) 43 44 /* bitmap of the page sizes currently supported */ 45 #define OMAP_IOMMU_PGSIZES (SZ_4K | SZ_64K | SZ_1M | SZ_16M) 46 47 #define MMU_LOCK_BASE_SHIFT 10 48 #define MMU_LOCK_BASE_MASK (0x1f << MMU_LOCK_BASE_SHIFT) 49 #define MMU_LOCK_BASE(x) \ 50 ((x & MMU_LOCK_BASE_MASK) >> MMU_LOCK_BASE_SHIFT) 51 52 #define MMU_LOCK_VICT_SHIFT 4 53 #define MMU_LOCK_VICT_MASK (0x1f << MMU_LOCK_VICT_SHIFT) 54 #define MMU_LOCK_VICT(x) \ 55 ((x & MMU_LOCK_VICT_MASK) >> MMU_LOCK_VICT_SHIFT) 56 57 static struct platform_driver omap_iommu_driver; 58 static struct kmem_cache *iopte_cachep; 59 60 /** 61 * to_omap_domain - Get struct omap_iommu_domain from generic iommu_domain 62 * @dom: generic iommu domain handle 63 **/ 64 static struct omap_iommu_domain *to_omap_domain(struct iommu_domain *dom) 65 { 66 return container_of(dom, struct omap_iommu_domain, domain); 67 } 68 69 /** 70 * omap_iommu_save_ctx - Save registers for pm off-mode support 71 * @dev: client device 72 **/ 73 void omap_iommu_save_ctx(struct device *dev) 74 { 75 struct omap_iommu_arch_data *arch_data = dev->archdata.iommu; 76 struct omap_iommu *obj; 77 u32 *p; 78 int i; 79 80 if (!arch_data) 81 return; 82 83 while (arch_data->iommu_dev) { 84 obj = arch_data->iommu_dev; 85 p = obj->ctx; 86 for (i = 0; i < (MMU_REG_SIZE / sizeof(u32)); i++) { 87 p[i] = iommu_read_reg(obj, i * sizeof(u32)); 88 dev_dbg(obj->dev, "%s\t[%02d] %08x\n", __func__, i, 89 p[i]); 90 } 91 arch_data++; 92 } 93 } 94 EXPORT_SYMBOL_GPL(omap_iommu_save_ctx); 95 96 /** 97 * omap_iommu_restore_ctx - Restore registers for pm off-mode support 98 * @dev: client device 99 **/ 100 void omap_iommu_restore_ctx(struct device *dev) 101 { 102 struct omap_iommu_arch_data *arch_data = dev->archdata.iommu; 103 struct omap_iommu *obj; 104 u32 *p; 105 int i; 106 107 if (!arch_data) 108 return; 109 110 while (arch_data->iommu_dev) { 111 obj = arch_data->iommu_dev; 112 p = obj->ctx; 113 for (i = 0; i < (MMU_REG_SIZE / sizeof(u32)); i++) { 114 iommu_write_reg(obj, p[i], i * sizeof(u32)); 115 dev_dbg(obj->dev, "%s\t[%02d] %08x\n", __func__, i, 116 p[i]); 117 } 118 arch_data++; 119 } 120 } 121 EXPORT_SYMBOL_GPL(omap_iommu_restore_ctx); 122 123 static void dra7_cfg_dspsys_mmu(struct omap_iommu *obj, bool enable) 124 { 125 u32 val, mask; 126 127 if (!obj->syscfg) 128 return; 129 130 mask = (1 << (obj->id * DSP_SYS_MMU_CONFIG_EN_SHIFT)); 131 val = enable ? mask : 0; 132 regmap_update_bits(obj->syscfg, DSP_SYS_MMU_CONFIG, mask, val); 133 } 134 135 static void __iommu_set_twl(struct omap_iommu *obj, bool on) 136 { 137 u32 l = iommu_read_reg(obj, MMU_CNTL); 138 139 if (on) 140 iommu_write_reg(obj, MMU_IRQ_TWL_MASK, MMU_IRQENABLE); 141 else 142 iommu_write_reg(obj, MMU_IRQ_TLB_MISS_MASK, MMU_IRQENABLE); 143 144 l &= ~MMU_CNTL_MASK; 145 if (on) 146 l |= (MMU_CNTL_MMU_EN | MMU_CNTL_TWL_EN); 147 else 148 l |= (MMU_CNTL_MMU_EN); 149 150 iommu_write_reg(obj, l, MMU_CNTL); 151 } 152 153 static int omap2_iommu_enable(struct omap_iommu *obj) 154 { 155 u32 l, pa; 156 157 if (!obj->iopgd || !IS_ALIGNED((u32)obj->iopgd, SZ_16K)) 158 return -EINVAL; 159 160 pa = virt_to_phys(obj->iopgd); 161 if (!IS_ALIGNED(pa, SZ_16K)) 162 return -EINVAL; 163 164 l = iommu_read_reg(obj, MMU_REVISION); 165 dev_info(obj->dev, "%s: version %d.%d\n", obj->name, 166 (l >> 4) & 0xf, l & 0xf); 167 168 iommu_write_reg(obj, pa, MMU_TTB); 169 170 dra7_cfg_dspsys_mmu(obj, true); 171 172 if (obj->has_bus_err_back) 173 iommu_write_reg(obj, MMU_GP_REG_BUS_ERR_BACK_EN, MMU_GP_REG); 174 175 __iommu_set_twl(obj, true); 176 177 return 0; 178 } 179 180 static void omap2_iommu_disable(struct omap_iommu *obj) 181 { 182 u32 l = iommu_read_reg(obj, MMU_CNTL); 183 184 l &= ~MMU_CNTL_MASK; 185 iommu_write_reg(obj, l, MMU_CNTL); 186 dra7_cfg_dspsys_mmu(obj, false); 187 188 dev_dbg(obj->dev, "%s is shutting down\n", obj->name); 189 } 190 191 static int iommu_enable(struct omap_iommu *obj) 192 { 193 int err; 194 struct platform_device *pdev = to_platform_device(obj->dev); 195 struct iommu_platform_data *pdata = dev_get_platdata(&pdev->dev); 196 197 if (pdata && pdata->deassert_reset) { 198 err = pdata->deassert_reset(pdev, pdata->reset_name); 199 if (err) { 200 dev_err(obj->dev, "deassert_reset failed: %d\n", err); 201 return err; 202 } 203 } 204 205 pm_runtime_get_sync(obj->dev); 206 207 err = omap2_iommu_enable(obj); 208 209 return err; 210 } 211 212 static void iommu_disable(struct omap_iommu *obj) 213 { 214 struct platform_device *pdev = to_platform_device(obj->dev); 215 struct iommu_platform_data *pdata = dev_get_platdata(&pdev->dev); 216 217 omap2_iommu_disable(obj); 218 219 pm_runtime_put_sync(obj->dev); 220 221 if (pdata && pdata->assert_reset) 222 pdata->assert_reset(pdev, pdata->reset_name); 223 } 224 225 /* 226 * TLB operations 227 */ 228 static u32 iotlb_cr_to_virt(struct cr_regs *cr) 229 { 230 u32 page_size = cr->cam & MMU_CAM_PGSZ_MASK; 231 u32 mask = get_cam_va_mask(cr->cam & page_size); 232 233 return cr->cam & mask; 234 } 235 236 static u32 get_iopte_attr(struct iotlb_entry *e) 237 { 238 u32 attr; 239 240 attr = e->mixed << 5; 241 attr |= e->endian; 242 attr |= e->elsz >> 3; 243 attr <<= (((e->pgsz == MMU_CAM_PGSZ_4K) || 244 (e->pgsz == MMU_CAM_PGSZ_64K)) ? 0 : 6); 245 return attr; 246 } 247 248 static u32 iommu_report_fault(struct omap_iommu *obj, u32 *da) 249 { 250 u32 status, fault_addr; 251 252 status = iommu_read_reg(obj, MMU_IRQSTATUS); 253 status &= MMU_IRQ_MASK; 254 if (!status) { 255 *da = 0; 256 return 0; 257 } 258 259 fault_addr = iommu_read_reg(obj, MMU_FAULT_AD); 260 *da = fault_addr; 261 262 iommu_write_reg(obj, status, MMU_IRQSTATUS); 263 264 return status; 265 } 266 267 void iotlb_lock_get(struct omap_iommu *obj, struct iotlb_lock *l) 268 { 269 u32 val; 270 271 val = iommu_read_reg(obj, MMU_LOCK); 272 273 l->base = MMU_LOCK_BASE(val); 274 l->vict = MMU_LOCK_VICT(val); 275 } 276 277 void iotlb_lock_set(struct omap_iommu *obj, struct iotlb_lock *l) 278 { 279 u32 val; 280 281 val = (l->base << MMU_LOCK_BASE_SHIFT); 282 val |= (l->vict << MMU_LOCK_VICT_SHIFT); 283 284 iommu_write_reg(obj, val, MMU_LOCK); 285 } 286 287 static void iotlb_read_cr(struct omap_iommu *obj, struct cr_regs *cr) 288 { 289 cr->cam = iommu_read_reg(obj, MMU_READ_CAM); 290 cr->ram = iommu_read_reg(obj, MMU_READ_RAM); 291 } 292 293 static void iotlb_load_cr(struct omap_iommu *obj, struct cr_regs *cr) 294 { 295 iommu_write_reg(obj, cr->cam | MMU_CAM_V, MMU_CAM); 296 iommu_write_reg(obj, cr->ram, MMU_RAM); 297 298 iommu_write_reg(obj, 1, MMU_FLUSH_ENTRY); 299 iommu_write_reg(obj, 1, MMU_LD_TLB); 300 } 301 302 /* only used in iotlb iteration for-loop */ 303 struct cr_regs __iotlb_read_cr(struct omap_iommu *obj, int n) 304 { 305 struct cr_regs cr; 306 struct iotlb_lock l; 307 308 iotlb_lock_get(obj, &l); 309 l.vict = n; 310 iotlb_lock_set(obj, &l); 311 iotlb_read_cr(obj, &cr); 312 313 return cr; 314 } 315 316 #ifdef PREFETCH_IOTLB 317 static struct cr_regs *iotlb_alloc_cr(struct omap_iommu *obj, 318 struct iotlb_entry *e) 319 { 320 struct cr_regs *cr; 321 322 if (!e) 323 return NULL; 324 325 if (e->da & ~(get_cam_va_mask(e->pgsz))) { 326 dev_err(obj->dev, "%s:\twrong alignment: %08x\n", __func__, 327 e->da); 328 return ERR_PTR(-EINVAL); 329 } 330 331 cr = kmalloc(sizeof(*cr), GFP_KERNEL); 332 if (!cr) 333 return ERR_PTR(-ENOMEM); 334 335 cr->cam = (e->da & MMU_CAM_VATAG_MASK) | e->prsvd | e->pgsz | e->valid; 336 cr->ram = e->pa | e->endian | e->elsz | e->mixed; 337 338 return cr; 339 } 340 341 /** 342 * load_iotlb_entry - Set an iommu tlb entry 343 * @obj: target iommu 344 * @e: an iommu tlb entry info 345 **/ 346 static int load_iotlb_entry(struct omap_iommu *obj, struct iotlb_entry *e) 347 { 348 int err = 0; 349 struct iotlb_lock l; 350 struct cr_regs *cr; 351 352 if (!obj || !obj->nr_tlb_entries || !e) 353 return -EINVAL; 354 355 pm_runtime_get_sync(obj->dev); 356 357 iotlb_lock_get(obj, &l); 358 if (l.base == obj->nr_tlb_entries) { 359 dev_warn(obj->dev, "%s: preserve entries full\n", __func__); 360 err = -EBUSY; 361 goto out; 362 } 363 if (!e->prsvd) { 364 int i; 365 struct cr_regs tmp; 366 367 for_each_iotlb_cr(obj, obj->nr_tlb_entries, i, tmp) 368 if (!iotlb_cr_valid(&tmp)) 369 break; 370 371 if (i == obj->nr_tlb_entries) { 372 dev_dbg(obj->dev, "%s: full: no entry\n", __func__); 373 err = -EBUSY; 374 goto out; 375 } 376 377 iotlb_lock_get(obj, &l); 378 } else { 379 l.vict = l.base; 380 iotlb_lock_set(obj, &l); 381 } 382 383 cr = iotlb_alloc_cr(obj, e); 384 if (IS_ERR(cr)) { 385 pm_runtime_put_sync(obj->dev); 386 return PTR_ERR(cr); 387 } 388 389 iotlb_load_cr(obj, cr); 390 kfree(cr); 391 392 if (e->prsvd) 393 l.base++; 394 /* increment victim for next tlb load */ 395 if (++l.vict == obj->nr_tlb_entries) 396 l.vict = l.base; 397 iotlb_lock_set(obj, &l); 398 out: 399 pm_runtime_put_sync(obj->dev); 400 return err; 401 } 402 403 #else /* !PREFETCH_IOTLB */ 404 405 static int load_iotlb_entry(struct omap_iommu *obj, struct iotlb_entry *e) 406 { 407 return 0; 408 } 409 410 #endif /* !PREFETCH_IOTLB */ 411 412 static int prefetch_iotlb_entry(struct omap_iommu *obj, struct iotlb_entry *e) 413 { 414 return load_iotlb_entry(obj, e); 415 } 416 417 /** 418 * flush_iotlb_page - Clear an iommu tlb entry 419 * @obj: target iommu 420 * @da: iommu device virtual address 421 * 422 * Clear an iommu tlb entry which includes 'da' address. 423 **/ 424 static void flush_iotlb_page(struct omap_iommu *obj, u32 da) 425 { 426 int i; 427 struct cr_regs cr; 428 429 pm_runtime_get_sync(obj->dev); 430 431 for_each_iotlb_cr(obj, obj->nr_tlb_entries, i, cr) { 432 u32 start; 433 size_t bytes; 434 435 if (!iotlb_cr_valid(&cr)) 436 continue; 437 438 start = iotlb_cr_to_virt(&cr); 439 bytes = iopgsz_to_bytes(cr.cam & 3); 440 441 if ((start <= da) && (da < start + bytes)) { 442 dev_dbg(obj->dev, "%s: %08x<=%08x(%x)\n", 443 __func__, start, da, bytes); 444 iotlb_load_cr(obj, &cr); 445 iommu_write_reg(obj, 1, MMU_FLUSH_ENTRY); 446 break; 447 } 448 } 449 pm_runtime_put_sync(obj->dev); 450 451 if (i == obj->nr_tlb_entries) 452 dev_dbg(obj->dev, "%s: no page for %08x\n", __func__, da); 453 } 454 455 /** 456 * flush_iotlb_all - Clear all iommu tlb entries 457 * @obj: target iommu 458 **/ 459 static void flush_iotlb_all(struct omap_iommu *obj) 460 { 461 struct iotlb_lock l; 462 463 pm_runtime_get_sync(obj->dev); 464 465 l.base = 0; 466 l.vict = 0; 467 iotlb_lock_set(obj, &l); 468 469 iommu_write_reg(obj, 1, MMU_GFLUSH); 470 471 pm_runtime_put_sync(obj->dev); 472 } 473 474 /* 475 * H/W pagetable operations 476 */ 477 static void flush_iopte_range(struct device *dev, dma_addr_t dma, 478 unsigned long offset, int num_entries) 479 { 480 size_t size = num_entries * sizeof(u32); 481 482 dma_sync_single_range_for_device(dev, dma, offset, size, DMA_TO_DEVICE); 483 } 484 485 static void iopte_free(struct omap_iommu *obj, u32 *iopte, bool dma_valid) 486 { 487 dma_addr_t pt_dma; 488 489 /* Note: freed iopte's must be clean ready for re-use */ 490 if (iopte) { 491 if (dma_valid) { 492 pt_dma = virt_to_phys(iopte); 493 dma_unmap_single(obj->dev, pt_dma, IOPTE_TABLE_SIZE, 494 DMA_TO_DEVICE); 495 } 496 497 kmem_cache_free(iopte_cachep, iopte); 498 } 499 } 500 501 static u32 *iopte_alloc(struct omap_iommu *obj, u32 *iopgd, 502 dma_addr_t *pt_dma, u32 da) 503 { 504 u32 *iopte; 505 unsigned long offset = iopgd_index(da) * sizeof(da); 506 507 /* a table has already existed */ 508 if (*iopgd) 509 goto pte_ready; 510 511 /* 512 * do the allocation outside the page table lock 513 */ 514 spin_unlock(&obj->page_table_lock); 515 iopte = kmem_cache_zalloc(iopte_cachep, GFP_KERNEL); 516 spin_lock(&obj->page_table_lock); 517 518 if (!*iopgd) { 519 if (!iopte) 520 return ERR_PTR(-ENOMEM); 521 522 *pt_dma = dma_map_single(obj->dev, iopte, IOPTE_TABLE_SIZE, 523 DMA_TO_DEVICE); 524 if (dma_mapping_error(obj->dev, *pt_dma)) { 525 dev_err(obj->dev, "DMA map error for L2 table\n"); 526 iopte_free(obj, iopte, false); 527 return ERR_PTR(-ENOMEM); 528 } 529 530 /* 531 * we rely on dma address and the physical address to be 532 * the same for mapping the L2 table 533 */ 534 if (WARN_ON(*pt_dma != virt_to_phys(iopte))) { 535 dev_err(obj->dev, "DMA translation error for L2 table\n"); 536 dma_unmap_single(obj->dev, *pt_dma, IOPTE_TABLE_SIZE, 537 DMA_TO_DEVICE); 538 iopte_free(obj, iopte, false); 539 return ERR_PTR(-ENOMEM); 540 } 541 542 *iopgd = virt_to_phys(iopte) | IOPGD_TABLE; 543 544 flush_iopte_range(obj->dev, obj->pd_dma, offset, 1); 545 dev_vdbg(obj->dev, "%s: a new pte:%p\n", __func__, iopte); 546 } else { 547 /* We raced, free the reduniovant table */ 548 iopte_free(obj, iopte, false); 549 } 550 551 pte_ready: 552 iopte = iopte_offset(iopgd, da); 553 *pt_dma = virt_to_phys(iopte); 554 dev_vdbg(obj->dev, 555 "%s: da:%08x pgd:%p *pgd:%08x pte:%p *pte:%08x\n", 556 __func__, da, iopgd, *iopgd, iopte, *iopte); 557 558 return iopte; 559 } 560 561 static int iopgd_alloc_section(struct omap_iommu *obj, u32 da, u32 pa, u32 prot) 562 { 563 u32 *iopgd = iopgd_offset(obj, da); 564 unsigned long offset = iopgd_index(da) * sizeof(da); 565 566 if ((da | pa) & ~IOSECTION_MASK) { 567 dev_err(obj->dev, "%s: %08x:%08x should aligned on %08lx\n", 568 __func__, da, pa, IOSECTION_SIZE); 569 return -EINVAL; 570 } 571 572 *iopgd = (pa & IOSECTION_MASK) | prot | IOPGD_SECTION; 573 flush_iopte_range(obj->dev, obj->pd_dma, offset, 1); 574 return 0; 575 } 576 577 static int iopgd_alloc_super(struct omap_iommu *obj, u32 da, u32 pa, u32 prot) 578 { 579 u32 *iopgd = iopgd_offset(obj, da); 580 unsigned long offset = iopgd_index(da) * sizeof(da); 581 int i; 582 583 if ((da | pa) & ~IOSUPER_MASK) { 584 dev_err(obj->dev, "%s: %08x:%08x should aligned on %08lx\n", 585 __func__, da, pa, IOSUPER_SIZE); 586 return -EINVAL; 587 } 588 589 for (i = 0; i < 16; i++) 590 *(iopgd + i) = (pa & IOSUPER_MASK) | prot | IOPGD_SUPER; 591 flush_iopte_range(obj->dev, obj->pd_dma, offset, 16); 592 return 0; 593 } 594 595 static int iopte_alloc_page(struct omap_iommu *obj, u32 da, u32 pa, u32 prot) 596 { 597 u32 *iopgd = iopgd_offset(obj, da); 598 dma_addr_t pt_dma; 599 u32 *iopte = iopte_alloc(obj, iopgd, &pt_dma, da); 600 unsigned long offset = iopte_index(da) * sizeof(da); 601 602 if (IS_ERR(iopte)) 603 return PTR_ERR(iopte); 604 605 *iopte = (pa & IOPAGE_MASK) | prot | IOPTE_SMALL; 606 flush_iopte_range(obj->dev, pt_dma, offset, 1); 607 608 dev_vdbg(obj->dev, "%s: da:%08x pa:%08x pte:%p *pte:%08x\n", 609 __func__, da, pa, iopte, *iopte); 610 611 return 0; 612 } 613 614 static int iopte_alloc_large(struct omap_iommu *obj, u32 da, u32 pa, u32 prot) 615 { 616 u32 *iopgd = iopgd_offset(obj, da); 617 dma_addr_t pt_dma; 618 u32 *iopte = iopte_alloc(obj, iopgd, &pt_dma, da); 619 unsigned long offset = iopte_index(da) * sizeof(da); 620 int i; 621 622 if ((da | pa) & ~IOLARGE_MASK) { 623 dev_err(obj->dev, "%s: %08x:%08x should aligned on %08lx\n", 624 __func__, da, pa, IOLARGE_SIZE); 625 return -EINVAL; 626 } 627 628 if (IS_ERR(iopte)) 629 return PTR_ERR(iopte); 630 631 for (i = 0; i < 16; i++) 632 *(iopte + i) = (pa & IOLARGE_MASK) | prot | IOPTE_LARGE; 633 flush_iopte_range(obj->dev, pt_dma, offset, 16); 634 return 0; 635 } 636 637 static int 638 iopgtable_store_entry_core(struct omap_iommu *obj, struct iotlb_entry *e) 639 { 640 int (*fn)(struct omap_iommu *, u32, u32, u32); 641 u32 prot; 642 int err; 643 644 if (!obj || !e) 645 return -EINVAL; 646 647 switch (e->pgsz) { 648 case MMU_CAM_PGSZ_16M: 649 fn = iopgd_alloc_super; 650 break; 651 case MMU_CAM_PGSZ_1M: 652 fn = iopgd_alloc_section; 653 break; 654 case MMU_CAM_PGSZ_64K: 655 fn = iopte_alloc_large; 656 break; 657 case MMU_CAM_PGSZ_4K: 658 fn = iopte_alloc_page; 659 break; 660 default: 661 fn = NULL; 662 break; 663 } 664 665 if (WARN_ON(!fn)) 666 return -EINVAL; 667 668 prot = get_iopte_attr(e); 669 670 spin_lock(&obj->page_table_lock); 671 err = fn(obj, e->da, e->pa, prot); 672 spin_unlock(&obj->page_table_lock); 673 674 return err; 675 } 676 677 /** 678 * omap_iopgtable_store_entry - Make an iommu pte entry 679 * @obj: target iommu 680 * @e: an iommu tlb entry info 681 **/ 682 static int 683 omap_iopgtable_store_entry(struct omap_iommu *obj, struct iotlb_entry *e) 684 { 685 int err; 686 687 flush_iotlb_page(obj, e->da); 688 err = iopgtable_store_entry_core(obj, e); 689 if (!err) 690 prefetch_iotlb_entry(obj, e); 691 return err; 692 } 693 694 /** 695 * iopgtable_lookup_entry - Lookup an iommu pte entry 696 * @obj: target iommu 697 * @da: iommu device virtual address 698 * @ppgd: iommu pgd entry pointer to be returned 699 * @ppte: iommu pte entry pointer to be returned 700 **/ 701 static void 702 iopgtable_lookup_entry(struct omap_iommu *obj, u32 da, u32 **ppgd, u32 **ppte) 703 { 704 u32 *iopgd, *iopte = NULL; 705 706 iopgd = iopgd_offset(obj, da); 707 if (!*iopgd) 708 goto out; 709 710 if (iopgd_is_table(*iopgd)) 711 iopte = iopte_offset(iopgd, da); 712 out: 713 *ppgd = iopgd; 714 *ppte = iopte; 715 } 716 717 static size_t iopgtable_clear_entry_core(struct omap_iommu *obj, u32 da) 718 { 719 size_t bytes; 720 u32 *iopgd = iopgd_offset(obj, da); 721 int nent = 1; 722 dma_addr_t pt_dma; 723 unsigned long pd_offset = iopgd_index(da) * sizeof(da); 724 unsigned long pt_offset = iopte_index(da) * sizeof(da); 725 726 if (!*iopgd) 727 return 0; 728 729 if (iopgd_is_table(*iopgd)) { 730 int i; 731 u32 *iopte = iopte_offset(iopgd, da); 732 733 bytes = IOPTE_SIZE; 734 if (*iopte & IOPTE_LARGE) { 735 nent *= 16; 736 /* rewind to the 1st entry */ 737 iopte = iopte_offset(iopgd, (da & IOLARGE_MASK)); 738 } 739 bytes *= nent; 740 memset(iopte, 0, nent * sizeof(*iopte)); 741 pt_dma = virt_to_phys(iopte); 742 flush_iopte_range(obj->dev, pt_dma, pt_offset, nent); 743 744 /* 745 * do table walk to check if this table is necessary or not 746 */ 747 iopte = iopte_offset(iopgd, 0); 748 for (i = 0; i < PTRS_PER_IOPTE; i++) 749 if (iopte[i]) 750 goto out; 751 752 iopte_free(obj, iopte, true); 753 nent = 1; /* for the next L1 entry */ 754 } else { 755 bytes = IOPGD_SIZE; 756 if ((*iopgd & IOPGD_SUPER) == IOPGD_SUPER) { 757 nent *= 16; 758 /* rewind to the 1st entry */ 759 iopgd = iopgd_offset(obj, (da & IOSUPER_MASK)); 760 } 761 bytes *= nent; 762 } 763 memset(iopgd, 0, nent * sizeof(*iopgd)); 764 flush_iopte_range(obj->dev, obj->pd_dma, pd_offset, nent); 765 out: 766 return bytes; 767 } 768 769 /** 770 * iopgtable_clear_entry - Remove an iommu pte entry 771 * @obj: target iommu 772 * @da: iommu device virtual address 773 **/ 774 static size_t iopgtable_clear_entry(struct omap_iommu *obj, u32 da) 775 { 776 size_t bytes; 777 778 spin_lock(&obj->page_table_lock); 779 780 bytes = iopgtable_clear_entry_core(obj, da); 781 flush_iotlb_page(obj, da); 782 783 spin_unlock(&obj->page_table_lock); 784 785 return bytes; 786 } 787 788 static void iopgtable_clear_entry_all(struct omap_iommu *obj) 789 { 790 unsigned long offset; 791 int i; 792 793 spin_lock(&obj->page_table_lock); 794 795 for (i = 0; i < PTRS_PER_IOPGD; i++) { 796 u32 da; 797 u32 *iopgd; 798 799 da = i << IOPGD_SHIFT; 800 iopgd = iopgd_offset(obj, da); 801 offset = iopgd_index(da) * sizeof(da); 802 803 if (!*iopgd) 804 continue; 805 806 if (iopgd_is_table(*iopgd)) 807 iopte_free(obj, iopte_offset(iopgd, 0), true); 808 809 *iopgd = 0; 810 flush_iopte_range(obj->dev, obj->pd_dma, offset, 1); 811 } 812 813 flush_iotlb_all(obj); 814 815 spin_unlock(&obj->page_table_lock); 816 } 817 818 /* 819 * Device IOMMU generic operations 820 */ 821 static irqreturn_t iommu_fault_handler(int irq, void *data) 822 { 823 u32 da, errs; 824 u32 *iopgd, *iopte; 825 struct omap_iommu *obj = data; 826 struct iommu_domain *domain = obj->domain; 827 struct omap_iommu_domain *omap_domain = to_omap_domain(domain); 828 829 if (!omap_domain->dev) 830 return IRQ_NONE; 831 832 errs = iommu_report_fault(obj, &da); 833 if (errs == 0) 834 return IRQ_HANDLED; 835 836 /* Fault callback or TLB/PTE Dynamic loading */ 837 if (!report_iommu_fault(domain, obj->dev, da, 0)) 838 return IRQ_HANDLED; 839 840 iommu_write_reg(obj, 0, MMU_IRQENABLE); 841 842 iopgd = iopgd_offset(obj, da); 843 844 if (!iopgd_is_table(*iopgd)) { 845 dev_err(obj->dev, "%s: errs:0x%08x da:0x%08x pgd:0x%p *pgd:px%08x\n", 846 obj->name, errs, da, iopgd, *iopgd); 847 return IRQ_NONE; 848 } 849 850 iopte = iopte_offset(iopgd, da); 851 852 dev_err(obj->dev, "%s: errs:0x%08x da:0x%08x pgd:0x%p *pgd:0x%08x pte:0x%p *pte:0x%08x\n", 853 obj->name, errs, da, iopgd, *iopgd, iopte, *iopte); 854 855 return IRQ_NONE; 856 } 857 858 /** 859 * omap_iommu_attach() - attach iommu device to an iommu domain 860 * @obj: target omap iommu device 861 * @iopgd: page table 862 **/ 863 static int omap_iommu_attach(struct omap_iommu *obj, u32 *iopgd) 864 { 865 int err; 866 867 spin_lock(&obj->iommu_lock); 868 869 obj->pd_dma = dma_map_single(obj->dev, iopgd, IOPGD_TABLE_SIZE, 870 DMA_TO_DEVICE); 871 if (dma_mapping_error(obj->dev, obj->pd_dma)) { 872 dev_err(obj->dev, "DMA map error for L1 table\n"); 873 err = -ENOMEM; 874 goto out_err; 875 } 876 877 obj->iopgd = iopgd; 878 err = iommu_enable(obj); 879 if (err) 880 goto out_err; 881 flush_iotlb_all(obj); 882 883 spin_unlock(&obj->iommu_lock); 884 885 dev_dbg(obj->dev, "%s: %s\n", __func__, obj->name); 886 887 return 0; 888 889 out_err: 890 spin_unlock(&obj->iommu_lock); 891 892 return err; 893 } 894 895 /** 896 * omap_iommu_detach - release iommu device 897 * @obj: target iommu 898 **/ 899 static void omap_iommu_detach(struct omap_iommu *obj) 900 { 901 if (!obj || IS_ERR(obj)) 902 return; 903 904 spin_lock(&obj->iommu_lock); 905 906 dma_unmap_single(obj->dev, obj->pd_dma, IOPGD_TABLE_SIZE, 907 DMA_TO_DEVICE); 908 iommu_disable(obj); 909 obj->pd_dma = 0; 910 obj->iopgd = NULL; 911 912 spin_unlock(&obj->iommu_lock); 913 914 dev_dbg(obj->dev, "%s: %s\n", __func__, obj->name); 915 } 916 917 static bool omap_iommu_can_register(struct platform_device *pdev) 918 { 919 struct device_node *np = pdev->dev.of_node; 920 921 if (!of_device_is_compatible(np, "ti,dra7-dsp-iommu")) 922 return true; 923 924 /* 925 * restrict IOMMU core registration only for processor-port MDMA MMUs 926 * on DRA7 DSPs 927 */ 928 if ((!strcmp(dev_name(&pdev->dev), "40d01000.mmu")) || 929 (!strcmp(dev_name(&pdev->dev), "41501000.mmu"))) 930 return true; 931 932 return false; 933 } 934 935 static int omap_iommu_dra7_get_dsp_system_cfg(struct platform_device *pdev, 936 struct omap_iommu *obj) 937 { 938 struct device_node *np = pdev->dev.of_node; 939 int ret; 940 941 if (!of_device_is_compatible(np, "ti,dra7-dsp-iommu")) 942 return 0; 943 944 if (!of_property_read_bool(np, "ti,syscon-mmuconfig")) { 945 dev_err(&pdev->dev, "ti,syscon-mmuconfig property is missing\n"); 946 return -EINVAL; 947 } 948 949 obj->syscfg = 950 syscon_regmap_lookup_by_phandle(np, "ti,syscon-mmuconfig"); 951 if (IS_ERR(obj->syscfg)) { 952 /* can fail with -EPROBE_DEFER */ 953 ret = PTR_ERR(obj->syscfg); 954 return ret; 955 } 956 957 if (of_property_read_u32_index(np, "ti,syscon-mmuconfig", 1, 958 &obj->id)) { 959 dev_err(&pdev->dev, "couldn't get the IOMMU instance id within subsystem\n"); 960 return -EINVAL; 961 } 962 963 if (obj->id != 0 && obj->id != 1) { 964 dev_err(&pdev->dev, "invalid IOMMU instance id\n"); 965 return -EINVAL; 966 } 967 968 return 0; 969 } 970 971 /* 972 * OMAP Device MMU(IOMMU) detection 973 */ 974 static int omap_iommu_probe(struct platform_device *pdev) 975 { 976 int err = -ENODEV; 977 int irq; 978 struct omap_iommu *obj; 979 struct resource *res; 980 struct device_node *of = pdev->dev.of_node; 981 982 if (!of) { 983 pr_err("%s: only DT-based devices are supported\n", __func__); 984 return -ENODEV; 985 } 986 987 obj = devm_kzalloc(&pdev->dev, sizeof(*obj) + MMU_REG_SIZE, GFP_KERNEL); 988 if (!obj) 989 return -ENOMEM; 990 991 obj->name = dev_name(&pdev->dev); 992 obj->nr_tlb_entries = 32; 993 err = of_property_read_u32(of, "ti,#tlb-entries", &obj->nr_tlb_entries); 994 if (err && err != -EINVAL) 995 return err; 996 if (obj->nr_tlb_entries != 32 && obj->nr_tlb_entries != 8) 997 return -EINVAL; 998 if (of_find_property(of, "ti,iommu-bus-err-back", NULL)) 999 obj->has_bus_err_back = MMU_GP_REG_BUS_ERR_BACK_EN; 1000 1001 obj->dev = &pdev->dev; 1002 obj->ctx = (void *)obj + sizeof(*obj); 1003 1004 spin_lock_init(&obj->iommu_lock); 1005 spin_lock_init(&obj->page_table_lock); 1006 1007 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 1008 obj->regbase = devm_ioremap_resource(obj->dev, res); 1009 if (IS_ERR(obj->regbase)) 1010 return PTR_ERR(obj->regbase); 1011 1012 err = omap_iommu_dra7_get_dsp_system_cfg(pdev, obj); 1013 if (err) 1014 return err; 1015 1016 irq = platform_get_irq(pdev, 0); 1017 if (irq < 0) 1018 return -ENODEV; 1019 1020 err = devm_request_irq(obj->dev, irq, iommu_fault_handler, IRQF_SHARED, 1021 dev_name(obj->dev), obj); 1022 if (err < 0) 1023 return err; 1024 platform_set_drvdata(pdev, obj); 1025 1026 if (omap_iommu_can_register(pdev)) { 1027 obj->group = iommu_group_alloc(); 1028 if (IS_ERR(obj->group)) 1029 return PTR_ERR(obj->group); 1030 1031 err = iommu_device_sysfs_add(&obj->iommu, obj->dev, NULL, 1032 obj->name); 1033 if (err) 1034 goto out_group; 1035 1036 iommu_device_set_ops(&obj->iommu, &omap_iommu_ops); 1037 1038 err = iommu_device_register(&obj->iommu); 1039 if (err) 1040 goto out_sysfs; 1041 } 1042 1043 pm_runtime_irq_safe(obj->dev); 1044 pm_runtime_enable(obj->dev); 1045 1046 omap_iommu_debugfs_add(obj); 1047 1048 dev_info(&pdev->dev, "%s registered\n", obj->name); 1049 1050 return 0; 1051 1052 out_sysfs: 1053 iommu_device_sysfs_remove(&obj->iommu); 1054 out_group: 1055 iommu_group_put(obj->group); 1056 return err; 1057 } 1058 1059 static int omap_iommu_remove(struct platform_device *pdev) 1060 { 1061 struct omap_iommu *obj = platform_get_drvdata(pdev); 1062 1063 if (obj->group) { 1064 iommu_group_put(obj->group); 1065 obj->group = NULL; 1066 1067 iommu_device_sysfs_remove(&obj->iommu); 1068 iommu_device_unregister(&obj->iommu); 1069 } 1070 1071 omap_iommu_debugfs_remove(obj); 1072 1073 pm_runtime_disable(obj->dev); 1074 1075 dev_info(&pdev->dev, "%s removed\n", obj->name); 1076 return 0; 1077 } 1078 1079 static const struct of_device_id omap_iommu_of_match[] = { 1080 { .compatible = "ti,omap2-iommu" }, 1081 { .compatible = "ti,omap4-iommu" }, 1082 { .compatible = "ti,dra7-iommu" }, 1083 { .compatible = "ti,dra7-dsp-iommu" }, 1084 {}, 1085 }; 1086 1087 static struct platform_driver omap_iommu_driver = { 1088 .probe = omap_iommu_probe, 1089 .remove = omap_iommu_remove, 1090 .driver = { 1091 .name = "omap-iommu", 1092 .of_match_table = of_match_ptr(omap_iommu_of_match), 1093 }, 1094 }; 1095 1096 static u32 iotlb_init_entry(struct iotlb_entry *e, u32 da, u32 pa, int pgsz) 1097 { 1098 memset(e, 0, sizeof(*e)); 1099 1100 e->da = da; 1101 e->pa = pa; 1102 e->valid = MMU_CAM_V; 1103 e->pgsz = pgsz; 1104 e->endian = MMU_RAM_ENDIAN_LITTLE; 1105 e->elsz = MMU_RAM_ELSZ_8; 1106 e->mixed = 0; 1107 1108 return iopgsz_to_bytes(e->pgsz); 1109 } 1110 1111 static int omap_iommu_map(struct iommu_domain *domain, unsigned long da, 1112 phys_addr_t pa, size_t bytes, int prot) 1113 { 1114 struct omap_iommu_domain *omap_domain = to_omap_domain(domain); 1115 struct device *dev = omap_domain->dev; 1116 struct omap_iommu_device *iommu; 1117 struct omap_iommu *oiommu; 1118 struct iotlb_entry e; 1119 int omap_pgsz; 1120 u32 ret = -EINVAL; 1121 int i; 1122 1123 omap_pgsz = bytes_to_iopgsz(bytes); 1124 if (omap_pgsz < 0) { 1125 dev_err(dev, "invalid size to map: %d\n", bytes); 1126 return -EINVAL; 1127 } 1128 1129 dev_dbg(dev, "mapping da 0x%lx to pa %pa size 0x%x\n", da, &pa, bytes); 1130 1131 iotlb_init_entry(&e, da, pa, omap_pgsz); 1132 1133 iommu = omap_domain->iommus; 1134 for (i = 0; i < omap_domain->num_iommus; i++, iommu++) { 1135 oiommu = iommu->iommu_dev; 1136 ret = omap_iopgtable_store_entry(oiommu, &e); 1137 if (ret) { 1138 dev_err(dev, "omap_iopgtable_store_entry failed: %d\n", 1139 ret); 1140 break; 1141 } 1142 } 1143 1144 if (ret) { 1145 while (i--) { 1146 iommu--; 1147 oiommu = iommu->iommu_dev; 1148 iopgtable_clear_entry(oiommu, da); 1149 } 1150 } 1151 1152 return ret; 1153 } 1154 1155 static size_t omap_iommu_unmap(struct iommu_domain *domain, unsigned long da, 1156 size_t size) 1157 { 1158 struct omap_iommu_domain *omap_domain = to_omap_domain(domain); 1159 struct device *dev = omap_domain->dev; 1160 struct omap_iommu_device *iommu; 1161 struct omap_iommu *oiommu; 1162 bool error = false; 1163 size_t bytes = 0; 1164 int i; 1165 1166 dev_dbg(dev, "unmapping da 0x%lx size %u\n", da, size); 1167 1168 iommu = omap_domain->iommus; 1169 for (i = 0; i < omap_domain->num_iommus; i++, iommu++) { 1170 oiommu = iommu->iommu_dev; 1171 bytes = iopgtable_clear_entry(oiommu, da); 1172 if (!bytes) 1173 error = true; 1174 } 1175 1176 /* 1177 * simplify return - we are only checking if any of the iommus 1178 * reported an error, but not if all of them are unmapping the 1179 * same number of entries. This should not occur due to the 1180 * mirror programming. 1181 */ 1182 return error ? 0 : bytes; 1183 } 1184 1185 static int omap_iommu_count(struct device *dev) 1186 { 1187 struct omap_iommu_arch_data *arch_data = dev->archdata.iommu; 1188 int count = 0; 1189 1190 while (arch_data->iommu_dev) { 1191 count++; 1192 arch_data++; 1193 } 1194 1195 return count; 1196 } 1197 1198 /* caller should call cleanup if this function fails */ 1199 static int omap_iommu_attach_init(struct device *dev, 1200 struct omap_iommu_domain *odomain) 1201 { 1202 struct omap_iommu_device *iommu; 1203 int i; 1204 1205 odomain->num_iommus = omap_iommu_count(dev); 1206 if (!odomain->num_iommus) 1207 return -EINVAL; 1208 1209 odomain->iommus = kcalloc(odomain->num_iommus, sizeof(*iommu), 1210 GFP_ATOMIC); 1211 if (!odomain->iommus) 1212 return -ENOMEM; 1213 1214 iommu = odomain->iommus; 1215 for (i = 0; i < odomain->num_iommus; i++, iommu++) { 1216 iommu->pgtable = kzalloc(IOPGD_TABLE_SIZE, GFP_ATOMIC); 1217 if (!iommu->pgtable) 1218 return -ENOMEM; 1219 1220 /* 1221 * should never fail, but please keep this around to ensure 1222 * we keep the hardware happy 1223 */ 1224 if (WARN_ON(!IS_ALIGNED((long)iommu->pgtable, 1225 IOPGD_TABLE_SIZE))) 1226 return -EINVAL; 1227 } 1228 1229 return 0; 1230 } 1231 1232 static void omap_iommu_detach_fini(struct omap_iommu_domain *odomain) 1233 { 1234 int i; 1235 struct omap_iommu_device *iommu = odomain->iommus; 1236 1237 for (i = 0; iommu && i < odomain->num_iommus; i++, iommu++) 1238 kfree(iommu->pgtable); 1239 1240 kfree(odomain->iommus); 1241 odomain->num_iommus = 0; 1242 odomain->iommus = NULL; 1243 } 1244 1245 static int 1246 omap_iommu_attach_dev(struct iommu_domain *domain, struct device *dev) 1247 { 1248 struct omap_iommu_domain *omap_domain = to_omap_domain(domain); 1249 struct omap_iommu_arch_data *arch_data = dev->archdata.iommu; 1250 struct omap_iommu_device *iommu; 1251 struct omap_iommu *oiommu; 1252 int ret = 0; 1253 int i; 1254 1255 if (!arch_data || !arch_data->iommu_dev) { 1256 dev_err(dev, "device doesn't have an associated iommu\n"); 1257 return -EINVAL; 1258 } 1259 1260 spin_lock(&omap_domain->lock); 1261 1262 /* only a single client device can be attached to a domain */ 1263 if (omap_domain->dev) { 1264 dev_err(dev, "iommu domain is already attached\n"); 1265 ret = -EBUSY; 1266 goto out; 1267 } 1268 1269 ret = omap_iommu_attach_init(dev, omap_domain); 1270 if (ret) { 1271 dev_err(dev, "failed to allocate required iommu data %d\n", 1272 ret); 1273 goto init_fail; 1274 } 1275 1276 iommu = omap_domain->iommus; 1277 for (i = 0; i < omap_domain->num_iommus; i++, iommu++, arch_data++) { 1278 /* configure and enable the omap iommu */ 1279 oiommu = arch_data->iommu_dev; 1280 ret = omap_iommu_attach(oiommu, iommu->pgtable); 1281 if (ret) { 1282 dev_err(dev, "can't get omap iommu: %d\n", ret); 1283 goto attach_fail; 1284 } 1285 1286 oiommu->domain = domain; 1287 iommu->iommu_dev = oiommu; 1288 } 1289 1290 omap_domain->dev = dev; 1291 1292 goto out; 1293 1294 attach_fail: 1295 while (i--) { 1296 iommu--; 1297 arch_data--; 1298 oiommu = iommu->iommu_dev; 1299 omap_iommu_detach(oiommu); 1300 iommu->iommu_dev = NULL; 1301 oiommu->domain = NULL; 1302 } 1303 init_fail: 1304 omap_iommu_detach_fini(omap_domain); 1305 out: 1306 spin_unlock(&omap_domain->lock); 1307 return ret; 1308 } 1309 1310 static void _omap_iommu_detach_dev(struct omap_iommu_domain *omap_domain, 1311 struct device *dev) 1312 { 1313 struct omap_iommu_arch_data *arch_data = dev->archdata.iommu; 1314 struct omap_iommu_device *iommu = omap_domain->iommus; 1315 struct omap_iommu *oiommu; 1316 int i; 1317 1318 if (!omap_domain->dev) { 1319 dev_err(dev, "domain has no attached device\n"); 1320 return; 1321 } 1322 1323 /* only a single device is supported per domain for now */ 1324 if (omap_domain->dev != dev) { 1325 dev_err(dev, "invalid attached device\n"); 1326 return; 1327 } 1328 1329 /* 1330 * cleanup in the reverse order of attachment - this addresses 1331 * any h/w dependencies between multiple instances, if any 1332 */ 1333 iommu += (omap_domain->num_iommus - 1); 1334 arch_data += (omap_domain->num_iommus - 1); 1335 for (i = 0; i < omap_domain->num_iommus; i++, iommu--, arch_data--) { 1336 oiommu = iommu->iommu_dev; 1337 iopgtable_clear_entry_all(oiommu); 1338 1339 omap_iommu_detach(oiommu); 1340 iommu->iommu_dev = NULL; 1341 oiommu->domain = NULL; 1342 } 1343 1344 omap_iommu_detach_fini(omap_domain); 1345 1346 omap_domain->dev = NULL; 1347 } 1348 1349 static void omap_iommu_detach_dev(struct iommu_domain *domain, 1350 struct device *dev) 1351 { 1352 struct omap_iommu_domain *omap_domain = to_omap_domain(domain); 1353 1354 spin_lock(&omap_domain->lock); 1355 _omap_iommu_detach_dev(omap_domain, dev); 1356 spin_unlock(&omap_domain->lock); 1357 } 1358 1359 static struct iommu_domain *omap_iommu_domain_alloc(unsigned type) 1360 { 1361 struct omap_iommu_domain *omap_domain; 1362 1363 if (type != IOMMU_DOMAIN_UNMANAGED) 1364 return NULL; 1365 1366 omap_domain = kzalloc(sizeof(*omap_domain), GFP_KERNEL); 1367 if (!omap_domain) 1368 return NULL; 1369 1370 spin_lock_init(&omap_domain->lock); 1371 1372 omap_domain->domain.geometry.aperture_start = 0; 1373 omap_domain->domain.geometry.aperture_end = (1ULL << 32) - 1; 1374 omap_domain->domain.geometry.force_aperture = true; 1375 1376 return &omap_domain->domain; 1377 } 1378 1379 static void omap_iommu_domain_free(struct iommu_domain *domain) 1380 { 1381 struct omap_iommu_domain *omap_domain = to_omap_domain(domain); 1382 1383 /* 1384 * An iommu device is still attached 1385 * (currently, only one device can be attached) ? 1386 */ 1387 if (omap_domain->dev) 1388 _omap_iommu_detach_dev(omap_domain, omap_domain->dev); 1389 1390 kfree(omap_domain); 1391 } 1392 1393 static phys_addr_t omap_iommu_iova_to_phys(struct iommu_domain *domain, 1394 dma_addr_t da) 1395 { 1396 struct omap_iommu_domain *omap_domain = to_omap_domain(domain); 1397 struct omap_iommu_device *iommu = omap_domain->iommus; 1398 struct omap_iommu *oiommu = iommu->iommu_dev; 1399 struct device *dev = oiommu->dev; 1400 u32 *pgd, *pte; 1401 phys_addr_t ret = 0; 1402 1403 /* 1404 * all the iommus within the domain will have identical programming, 1405 * so perform the lookup using just the first iommu 1406 */ 1407 iopgtable_lookup_entry(oiommu, da, &pgd, &pte); 1408 1409 if (pte) { 1410 if (iopte_is_small(*pte)) 1411 ret = omap_iommu_translate(*pte, da, IOPTE_MASK); 1412 else if (iopte_is_large(*pte)) 1413 ret = omap_iommu_translate(*pte, da, IOLARGE_MASK); 1414 else 1415 dev_err(dev, "bogus pte 0x%x, da 0x%llx", *pte, 1416 (unsigned long long)da); 1417 } else { 1418 if (iopgd_is_section(*pgd)) 1419 ret = omap_iommu_translate(*pgd, da, IOSECTION_MASK); 1420 else if (iopgd_is_super(*pgd)) 1421 ret = omap_iommu_translate(*pgd, da, IOSUPER_MASK); 1422 else 1423 dev_err(dev, "bogus pgd 0x%x, da 0x%llx", *pgd, 1424 (unsigned long long)da); 1425 } 1426 1427 return ret; 1428 } 1429 1430 static int omap_iommu_add_device(struct device *dev) 1431 { 1432 struct omap_iommu_arch_data *arch_data, *tmp; 1433 struct omap_iommu *oiommu; 1434 struct iommu_group *group; 1435 struct device_node *np; 1436 struct platform_device *pdev; 1437 int num_iommus, i; 1438 int ret; 1439 1440 /* 1441 * Allocate the archdata iommu structure for DT-based devices. 1442 * 1443 * TODO: Simplify this when removing non-DT support completely from the 1444 * IOMMU users. 1445 */ 1446 if (!dev->of_node) 1447 return 0; 1448 1449 /* 1450 * retrieve the count of IOMMU nodes using phandle size as element size 1451 * since #iommu-cells = 0 for OMAP 1452 */ 1453 num_iommus = of_property_count_elems_of_size(dev->of_node, "iommus", 1454 sizeof(phandle)); 1455 if (num_iommus < 0) 1456 return 0; 1457 1458 arch_data = kcalloc(num_iommus + 1, sizeof(*arch_data), GFP_KERNEL); 1459 if (!arch_data) 1460 return -ENOMEM; 1461 1462 for (i = 0, tmp = arch_data; i < num_iommus; i++, tmp++) { 1463 np = of_parse_phandle(dev->of_node, "iommus", i); 1464 if (!np) { 1465 kfree(arch_data); 1466 return -EINVAL; 1467 } 1468 1469 pdev = of_find_device_by_node(np); 1470 if (WARN_ON(!pdev)) { 1471 of_node_put(np); 1472 kfree(arch_data); 1473 return -EINVAL; 1474 } 1475 1476 oiommu = platform_get_drvdata(pdev); 1477 if (!oiommu) { 1478 of_node_put(np); 1479 kfree(arch_data); 1480 return -EINVAL; 1481 } 1482 1483 tmp->iommu_dev = oiommu; 1484 1485 of_node_put(np); 1486 } 1487 1488 /* 1489 * use the first IOMMU alone for the sysfs device linking. 1490 * TODO: Evaluate if a single iommu_group needs to be 1491 * maintained for both IOMMUs 1492 */ 1493 oiommu = arch_data->iommu_dev; 1494 ret = iommu_device_link(&oiommu->iommu, dev); 1495 if (ret) { 1496 kfree(arch_data); 1497 return ret; 1498 } 1499 1500 dev->archdata.iommu = arch_data; 1501 1502 /* 1503 * IOMMU group initialization calls into omap_iommu_device_group, which 1504 * needs a valid dev->archdata.iommu pointer 1505 */ 1506 group = iommu_group_get_for_dev(dev); 1507 if (IS_ERR(group)) { 1508 iommu_device_unlink(&oiommu->iommu, dev); 1509 dev->archdata.iommu = NULL; 1510 kfree(arch_data); 1511 return PTR_ERR(group); 1512 } 1513 iommu_group_put(group); 1514 1515 return 0; 1516 } 1517 1518 static void omap_iommu_remove_device(struct device *dev) 1519 { 1520 struct omap_iommu_arch_data *arch_data = dev->archdata.iommu; 1521 1522 if (!dev->of_node || !arch_data) 1523 return; 1524 1525 iommu_device_unlink(&arch_data->iommu_dev->iommu, dev); 1526 iommu_group_remove_device(dev); 1527 1528 dev->archdata.iommu = NULL; 1529 kfree(arch_data); 1530 1531 } 1532 1533 static struct iommu_group *omap_iommu_device_group(struct device *dev) 1534 { 1535 struct omap_iommu_arch_data *arch_data = dev->archdata.iommu; 1536 struct iommu_group *group = ERR_PTR(-EINVAL); 1537 1538 if (arch_data->iommu_dev) 1539 group = iommu_group_ref_get(arch_data->iommu_dev->group); 1540 1541 return group; 1542 } 1543 1544 static const struct iommu_ops omap_iommu_ops = { 1545 .domain_alloc = omap_iommu_domain_alloc, 1546 .domain_free = omap_iommu_domain_free, 1547 .attach_dev = omap_iommu_attach_dev, 1548 .detach_dev = omap_iommu_detach_dev, 1549 .map = omap_iommu_map, 1550 .unmap = omap_iommu_unmap, 1551 .map_sg = default_iommu_map_sg, 1552 .iova_to_phys = omap_iommu_iova_to_phys, 1553 .add_device = omap_iommu_add_device, 1554 .remove_device = omap_iommu_remove_device, 1555 .device_group = omap_iommu_device_group, 1556 .pgsize_bitmap = OMAP_IOMMU_PGSIZES, 1557 }; 1558 1559 static int __init omap_iommu_init(void) 1560 { 1561 struct kmem_cache *p; 1562 const unsigned long flags = SLAB_HWCACHE_ALIGN; 1563 size_t align = 1 << 10; /* L2 pagetable alignement */ 1564 struct device_node *np; 1565 int ret; 1566 1567 np = of_find_matching_node(NULL, omap_iommu_of_match); 1568 if (!np) 1569 return 0; 1570 1571 of_node_put(np); 1572 1573 p = kmem_cache_create("iopte_cache", IOPTE_TABLE_SIZE, align, flags, 1574 NULL); 1575 if (!p) 1576 return -ENOMEM; 1577 iopte_cachep = p; 1578 1579 omap_iommu_debugfs_init(); 1580 1581 ret = platform_driver_register(&omap_iommu_driver); 1582 if (ret) { 1583 pr_err("%s: failed to register driver\n", __func__); 1584 goto fail_driver; 1585 } 1586 1587 ret = bus_set_iommu(&platform_bus_type, &omap_iommu_ops); 1588 if (ret) 1589 goto fail_bus; 1590 1591 return 0; 1592 1593 fail_bus: 1594 platform_driver_unregister(&omap_iommu_driver); 1595 fail_driver: 1596 kmem_cache_destroy(iopte_cachep); 1597 return ret; 1598 } 1599 subsys_initcall(omap_iommu_init); 1600 /* must be ready before omap3isp is probed */ 1601