1// SPDX-License-Identifier: GPL-2.0-only 2/* 3 * omap iommu: tlb and pagetable primitives 4 * 5 * Copyright (C) 2008-2010 Nokia Corporation 6 * Copyright (C) 2013-2017 Texas Instruments Incorporated - https://www.ti.com/ 7 * 8 * Written by Hiroshi DOYU <Hiroshi.DOYU@nokia.com>, 9 * Paul Mundt and Toshihiro Kobayashi 10 */ 11 12#include <linux/dma-mapping.h> 13#include <linux/err.h> 14#include <linux/slab.h> 15#include <linux/interrupt.h> 16#include <linux/ioport.h> 17#include <linux/platform_device.h> 18#include <linux/iommu.h> 19#include <linux/omap-iommu.h> 20#include <linux/mutex.h> 21#include <linux/spinlock.h> 22#include <linux/io.h> 23#include <linux/pm_runtime.h> 24#include <linux/of.h> 25#include <linux/of_irq.h> 26#include <linux/of_platform.h> 27#include <linux/regmap.h> 28#include <linux/mfd/syscon.h> 29 30#include <linux/platform_data/iommu-omap.h> 31 32#include "omap-iopgtable.h" 33#include "omap-iommu.h" 34 35static const struct iommu_ops omap_iommu_ops; 36 37#define to_iommu(dev) ((struct omap_iommu *)dev_get_drvdata(dev)) 38 39/* bitmap of the page sizes currently supported */ 40#define OMAP_IOMMU_PGSIZES (SZ_4K | SZ_64K | SZ_1M | SZ_16M) 41 42#define MMU_LOCK_BASE_SHIFT 10 43#define MMU_LOCK_BASE_MASK (0x1f << MMU_LOCK_BASE_SHIFT) 44#define MMU_LOCK_BASE(x) \ 45 ((x & MMU_LOCK_BASE_MASK) >> MMU_LOCK_BASE_SHIFT) 46 47#define MMU_LOCK_VICT_SHIFT 4 48#define MMU_LOCK_VICT_MASK (0x1f << MMU_LOCK_VICT_SHIFT) 49#define MMU_LOCK_VICT(x) \ 50 ((x & MMU_LOCK_VICT_MASK) >> MMU_LOCK_VICT_SHIFT) 51 52static struct platform_driver omap_iommu_driver; 53static struct kmem_cache *iopte_cachep; 54 55/** 56 * to_omap_domain - Get struct omap_iommu_domain from generic iommu_domain 57 * @dom: generic iommu domain handle 58 **/ 59static struct omap_iommu_domain *to_omap_domain(struct iommu_domain *dom) 60{ 61 return container_of(dom, struct omap_iommu_domain, domain); 62} 63 64/** 65 * omap_iommu_save_ctx - Save registers for pm off-mode support 66 * @dev: client device 67 * 68 * This should be treated as an deprecated API. It is preserved only 69 * to maintain existing functionality for OMAP3 ISP driver. 70 **/ 71void omap_iommu_save_ctx(struct device *dev) 72{ 73 struct omap_iommu_arch_data *arch_data = dev_iommu_priv_get(dev); 74 struct omap_iommu *obj; 75 u32 *p; 76 int i; 77 78 if (!arch_data) 79 return; 80 81 while (arch_data->iommu_dev) { 82 obj = arch_data->iommu_dev; 83 p = obj->ctx; 84 for (i = 0; i < (MMU_REG_SIZE / sizeof(u32)); i++) { 85 p[i] = iommu_read_reg(obj, i * sizeof(u32)); 86 dev_dbg(obj->dev, "%s\t[%02d] %08x\n", __func__, i, 87 p[i]); 88 } 89 arch_data++; 90 } 91} 92EXPORT_SYMBOL_GPL(omap_iommu_save_ctx); 93 94/** 95 * omap_iommu_restore_ctx - Restore registers for pm off-mode support 96 * @dev: client device 97 * 98 * This should be treated as an deprecated API. It is preserved only 99 * to maintain existing functionality for OMAP3 ISP driver. 100 **/ 101void omap_iommu_restore_ctx(struct device *dev) 102{ 103 struct omap_iommu_arch_data *arch_data = dev_iommu_priv_get(dev); 104 struct omap_iommu *obj; 105 u32 *p; 106 int i; 107 108 if (!arch_data) 109 return; 110 111 while (arch_data->iommu_dev) { 112 obj = arch_data->iommu_dev; 113 p = obj->ctx; 114 for (i = 0; i < (MMU_REG_SIZE / sizeof(u32)); i++) { 115 iommu_write_reg(obj, p[i], i * sizeof(u32)); 116 dev_dbg(obj->dev, "%s\t[%02d] %08x\n", __func__, i, 117 p[i]); 118 } 119 arch_data++; 120 } 121} 122EXPORT_SYMBOL_GPL(omap_iommu_restore_ctx); 123 124static void dra7_cfg_dspsys_mmu(struct omap_iommu *obj, bool enable) 125{ 126 u32 val, mask; 127 128 if (!obj->syscfg) 129 return; 130 131 mask = (1 << (obj->id * DSP_SYS_MMU_CONFIG_EN_SHIFT)); 132 val = enable ? mask : 0; 133 regmap_update_bits(obj->syscfg, DSP_SYS_MMU_CONFIG, mask, val); 134} 135 136static void __iommu_set_twl(struct omap_iommu *obj, bool on) 137{ 138 u32 l = iommu_read_reg(obj, MMU_CNTL); 139 140 if (on) 141 iommu_write_reg(obj, MMU_IRQ_TWL_MASK, MMU_IRQENABLE); 142 else 143 iommu_write_reg(obj, MMU_IRQ_TLB_MISS_MASK, MMU_IRQENABLE); 144 145 l &= ~MMU_CNTL_MASK; 146 if (on) 147 l |= (MMU_CNTL_MMU_EN | MMU_CNTL_TWL_EN); 148 else 149 l |= (MMU_CNTL_MMU_EN); 150 151 iommu_write_reg(obj, l, MMU_CNTL); 152} 153 154static int omap2_iommu_enable(struct omap_iommu *obj) 155{ 156 u32 l, pa; 157 158 if (!obj->iopgd || !IS_ALIGNED((unsigned long)obj->iopgd, SZ_16K)) 159 return -EINVAL; 160 161 pa = virt_to_phys(obj->iopgd); 162 if (!IS_ALIGNED(pa, SZ_16K)) 163 return -EINVAL; 164 165 l = iommu_read_reg(obj, MMU_REVISION); 166 dev_info(obj->dev, "%s: version %d.%d\n", obj->name, 167 (l >> 4) & 0xf, l & 0xf); 168 169 iommu_write_reg(obj, pa, MMU_TTB); 170 171 dra7_cfg_dspsys_mmu(obj, true); 172 173 if (obj->has_bus_err_back) 174 iommu_write_reg(obj, MMU_GP_REG_BUS_ERR_BACK_EN, MMU_GP_REG); 175 176 __iommu_set_twl(obj, true); 177 178 return 0; 179} 180 181static void omap2_iommu_disable(struct omap_iommu *obj) 182{ 183 u32 l = iommu_read_reg(obj, MMU_CNTL); 184 185 l &= ~MMU_CNTL_MASK; 186 iommu_write_reg(obj, l, MMU_CNTL); 187 dra7_cfg_dspsys_mmu(obj, false); 188 189 dev_dbg(obj->dev, "%s is shutting down\n", obj->name); 190} 191 192static int iommu_enable(struct omap_iommu *obj) 193{ 194 int ret; 195 196 ret = pm_runtime_get_sync(obj->dev); 197 if (ret < 0) 198 pm_runtime_put_noidle(obj->dev); 199 200 return ret < 0 ? ret : 0; 201} 202 203static void iommu_disable(struct omap_iommu *obj) 204{ 205 pm_runtime_put_sync(obj->dev); 206} 207 208/* 209 * TLB operations 210 */ 211static u32 iotlb_cr_to_virt(struct cr_regs *cr) 212{ 213 u32 page_size = cr->cam & MMU_CAM_PGSZ_MASK; 214 u32 mask = get_cam_va_mask(cr->cam & page_size); 215 216 return cr->cam & mask; 217} 218 219static u32 get_iopte_attr(struct iotlb_entry *e) 220{ 221 u32 attr; 222 223 attr = e->mixed << 5; 224 attr |= e->endian; 225 attr |= e->elsz >> 3; 226 attr <<= (((e->pgsz == MMU_CAM_PGSZ_4K) || 227 (e->pgsz == MMU_CAM_PGSZ_64K)) ? 0 : 6); 228 return attr; 229} 230 231static u32 iommu_report_fault(struct omap_iommu *obj, u32 *da) 232{ 233 u32 status, fault_addr; 234 235 status = iommu_read_reg(obj, MMU_IRQSTATUS); 236 status &= MMU_IRQ_MASK; 237 if (!status) { 238 *da = 0; 239 return 0; 240 } 241 242 fault_addr = iommu_read_reg(obj, MMU_FAULT_AD); 243 *da = fault_addr; 244 245 iommu_write_reg(obj, status, MMU_IRQSTATUS); 246 247 return status; 248} 249 250void iotlb_lock_get(struct omap_iommu *obj, struct iotlb_lock *l) 251{ 252 u32 val; 253 254 val = iommu_read_reg(obj, MMU_LOCK); 255 256 l->base = MMU_LOCK_BASE(val); 257 l->vict = MMU_LOCK_VICT(val); 258} 259 260void iotlb_lock_set(struct omap_iommu *obj, struct iotlb_lock *l) 261{ 262 u32 val; 263 264 val = (l->base << MMU_LOCK_BASE_SHIFT); 265 val |= (l->vict << MMU_LOCK_VICT_SHIFT); 266 267 iommu_write_reg(obj, val, MMU_LOCK); 268} 269 270static void iotlb_read_cr(struct omap_iommu *obj, struct cr_regs *cr) 271{ 272 cr->cam = iommu_read_reg(obj, MMU_READ_CAM); 273 cr->ram = iommu_read_reg(obj, MMU_READ_RAM); 274} 275 276static void iotlb_load_cr(struct omap_iommu *obj, struct cr_regs *cr) 277{ 278 iommu_write_reg(obj, cr->cam | MMU_CAM_V, MMU_CAM); 279 iommu_write_reg(obj, cr->ram, MMU_RAM); 280 281 iommu_write_reg(obj, 1, MMU_FLUSH_ENTRY); 282 iommu_write_reg(obj, 1, MMU_LD_TLB); 283} 284 285/* only used in iotlb iteration for-loop */ 286struct cr_regs __iotlb_read_cr(struct omap_iommu *obj, int n) 287{ 288 struct cr_regs cr; 289 struct iotlb_lock l; 290 291 iotlb_lock_get(obj, &l); 292 l.vict = n; 293 iotlb_lock_set(obj, &l); 294 iotlb_read_cr(obj, &cr); 295 296 return cr; 297} 298 299#ifdef PREFETCH_IOTLB 300static struct cr_regs *iotlb_alloc_cr(struct omap_iommu *obj, 301 struct iotlb_entry *e) 302{ 303 struct cr_regs *cr; 304 305 if (!e) 306 return NULL; 307 308 if (e->da & ~(get_cam_va_mask(e->pgsz))) { 309 dev_err(obj->dev, "%s:\twrong alignment: %08x\n", __func__, 310 e->da); 311 return ERR_PTR(-EINVAL); 312 } 313 314 cr = kmalloc(sizeof(*cr), GFP_KERNEL); 315 if (!cr) 316 return ERR_PTR(-ENOMEM); 317 318 cr->cam = (e->da & MMU_CAM_VATAG_MASK) | e->prsvd | e->pgsz | e->valid; 319 cr->ram = e->pa | e->endian | e->elsz | e->mixed; 320 321 return cr; 322} 323 324/** 325 * load_iotlb_entry - Set an iommu tlb entry 326 * @obj: target iommu 327 * @e: an iommu tlb entry info 328 **/ 329static int load_iotlb_entry(struct omap_iommu *obj, struct iotlb_entry *e) 330{ 331 int err = 0; 332 struct iotlb_lock l; 333 struct cr_regs *cr; 334 335 if (!obj || !obj->nr_tlb_entries || !e) 336 return -EINVAL; 337 338 pm_runtime_get_sync(obj->dev); 339 340 iotlb_lock_get(obj, &l); 341 if (l.base == obj->nr_tlb_entries) { 342 dev_warn(obj->dev, "%s: preserve entries full\n", __func__); 343 err = -EBUSY; 344 goto out; 345 } 346 if (!e->prsvd) { 347 int i; 348 struct cr_regs tmp; 349 350 for_each_iotlb_cr(obj, obj->nr_tlb_entries, i, tmp) 351 if (!iotlb_cr_valid(&tmp)) 352 break; 353 354 if (i == obj->nr_tlb_entries) { 355 dev_dbg(obj->dev, "%s: full: no entry\n", __func__); 356 err = -EBUSY; 357 goto out; 358 } 359 360 iotlb_lock_get(obj, &l); 361 } else { 362 l.vict = l.base; 363 iotlb_lock_set(obj, &l); 364 } 365 366 cr = iotlb_alloc_cr(obj, e); 367 if (IS_ERR(cr)) { 368 pm_runtime_put_sync(obj->dev); 369 return PTR_ERR(cr); 370 } 371 372 iotlb_load_cr(obj, cr); 373 kfree(cr); 374 375 if (e->prsvd) 376 l.base++; 377 /* increment victim for next tlb load */ 378 if (++l.vict == obj->nr_tlb_entries) 379 l.vict = l.base; 380 iotlb_lock_set(obj, &l); 381out: 382 pm_runtime_put_sync(obj->dev); 383 return err; 384} 385 386#else /* !PREFETCH_IOTLB */ 387 388static int load_iotlb_entry(struct omap_iommu *obj, struct iotlb_entry *e) 389{ 390 return 0; 391} 392 393#endif /* !PREFETCH_IOTLB */ 394 395static int prefetch_iotlb_entry(struct omap_iommu *obj, struct iotlb_entry *e) 396{ 397 return load_iotlb_entry(obj, e); 398} 399 400/** 401 * flush_iotlb_page - Clear an iommu tlb entry 402 * @obj: target iommu 403 * @da: iommu device virtual address 404 * 405 * Clear an iommu tlb entry which includes 'da' address. 406 **/ 407static void flush_iotlb_page(struct omap_iommu *obj, u32 da) 408{ 409 int i; 410 struct cr_regs cr; 411 412 pm_runtime_get_sync(obj->dev); 413 414 for_each_iotlb_cr(obj, obj->nr_tlb_entries, i, cr) { 415 u32 start; 416 size_t bytes; 417 418 if (!iotlb_cr_valid(&cr)) 419 continue; 420 421 start = iotlb_cr_to_virt(&cr); 422 bytes = iopgsz_to_bytes(cr.cam & 3); 423 424 if ((start <= da) && (da < start + bytes)) { 425 dev_dbg(obj->dev, "%s: %08x<=%08x(%zx)\n", 426 __func__, start, da, bytes); 427 iotlb_load_cr(obj, &cr); 428 iommu_write_reg(obj, 1, MMU_FLUSH_ENTRY); 429 break; 430 } 431 } 432 pm_runtime_put_sync(obj->dev); 433 434 if (i == obj->nr_tlb_entries) 435 dev_dbg(obj->dev, "%s: no page for %08x\n", __func__, da); 436} 437 438/** 439 * flush_iotlb_all - Clear all iommu tlb entries 440 * @obj: target iommu 441 **/ 442static void flush_iotlb_all(struct omap_iommu *obj) 443{ 444 struct iotlb_lock l; 445 446 pm_runtime_get_sync(obj->dev); 447 448 l.base = 0; 449 l.vict = 0; 450 iotlb_lock_set(obj, &l); 451 452 iommu_write_reg(obj, 1, MMU_GFLUSH); 453 454 pm_runtime_put_sync(obj->dev); 455} 456 457/* 458 * H/W pagetable operations 459 */ 460static void flush_iopte_range(struct device *dev, dma_addr_t dma, 461 unsigned long offset, int num_entries) 462{ 463 size_t size = num_entries * sizeof(u32); 464 465 dma_sync_single_range_for_device(dev, dma, offset, size, DMA_TO_DEVICE); 466} 467 468static void iopte_free(struct omap_iommu *obj, u32 *iopte, bool dma_valid) 469{ 470 dma_addr_t pt_dma; 471 472 /* Note: freed iopte's must be clean ready for re-use */ 473 if (iopte) { 474 if (dma_valid) { 475 pt_dma = virt_to_phys(iopte); 476 dma_unmap_single(obj->dev, pt_dma, IOPTE_TABLE_SIZE, 477 DMA_TO_DEVICE); 478 } 479 480 kmem_cache_free(iopte_cachep, iopte); 481 } 482} 483 484static u32 *iopte_alloc(struct omap_iommu *obj, u32 *iopgd, 485 dma_addr_t *pt_dma, u32 da) 486{ 487 u32 *iopte; 488 unsigned long offset = iopgd_index(da) * sizeof(da); 489 490 /* a table has already existed */ 491 if (*iopgd) 492 goto pte_ready; 493 494 /* 495 * do the allocation outside the page table lock 496 */ 497 spin_unlock(&obj->page_table_lock); 498 iopte = kmem_cache_zalloc(iopte_cachep, GFP_KERNEL); 499 spin_lock(&obj->page_table_lock); 500 501 if (!*iopgd) { 502 if (!iopte) 503 return ERR_PTR(-ENOMEM); 504 505 *pt_dma = dma_map_single(obj->dev, iopte, IOPTE_TABLE_SIZE, 506 DMA_TO_DEVICE); 507 if (dma_mapping_error(obj->dev, *pt_dma)) { 508 dev_err(obj->dev, "DMA map error for L2 table\n"); 509 iopte_free(obj, iopte, false); 510 return ERR_PTR(-ENOMEM); 511 } 512 513 /* 514 * we rely on dma address and the physical address to be 515 * the same for mapping the L2 table 516 */ 517 if (WARN_ON(*pt_dma != virt_to_phys(iopte))) { 518 dev_err(obj->dev, "DMA translation error for L2 table\n"); 519 dma_unmap_single(obj->dev, *pt_dma, IOPTE_TABLE_SIZE, 520 DMA_TO_DEVICE); 521 iopte_free(obj, iopte, false); 522 return ERR_PTR(-ENOMEM); 523 } 524 525 *iopgd = virt_to_phys(iopte) | IOPGD_TABLE; 526 527 flush_iopte_range(obj->dev, obj->pd_dma, offset, 1); 528 dev_vdbg(obj->dev, "%s: a new pte:%p\n", __func__, iopte); 529 } else { 530 /* We raced, free the reduniovant table */ 531 iopte_free(obj, iopte, false); 532 } 533 534pte_ready: 535 iopte = iopte_offset(iopgd, da); 536 *pt_dma = iopgd_page_paddr(iopgd); 537 dev_vdbg(obj->dev, 538 "%s: da:%08x pgd:%p *pgd:%08x pte:%p *pte:%08x\n", 539 __func__, da, iopgd, *iopgd, iopte, *iopte); 540 541 return iopte; 542} 543 544static int iopgd_alloc_section(struct omap_iommu *obj, u32 da, u32 pa, u32 prot) 545{ 546 u32 *iopgd = iopgd_offset(obj, da); 547 unsigned long offset = iopgd_index(da) * sizeof(da); 548 549 if ((da | pa) & ~IOSECTION_MASK) { 550 dev_err(obj->dev, "%s: %08x:%08x should aligned on %08lx\n", 551 __func__, da, pa, IOSECTION_SIZE); 552 return -EINVAL; 553 } 554 555 *iopgd = (pa & IOSECTION_MASK) | prot | IOPGD_SECTION; 556 flush_iopte_range(obj->dev, obj->pd_dma, offset, 1); 557 return 0; 558} 559 560static int iopgd_alloc_super(struct omap_iommu *obj, u32 da, u32 pa, u32 prot) 561{ 562 u32 *iopgd = iopgd_offset(obj, da); 563 unsigned long offset = iopgd_index(da) * sizeof(da); 564 int i; 565 566 if ((da | pa) & ~IOSUPER_MASK) { 567 dev_err(obj->dev, "%s: %08x:%08x should aligned on %08lx\n", 568 __func__, da, pa, IOSUPER_SIZE); 569 return -EINVAL; 570 } 571 572 for (i = 0; i < 16; i++) 573 *(iopgd + i) = (pa & IOSUPER_MASK) | prot | IOPGD_SUPER; 574 flush_iopte_range(obj->dev, obj->pd_dma, offset, 16); 575 return 0; 576} 577 578static int iopte_alloc_page(struct omap_iommu *obj, u32 da, u32 pa, u32 prot) 579{ 580 u32 *iopgd = iopgd_offset(obj, da); 581 dma_addr_t pt_dma; 582 u32 *iopte = iopte_alloc(obj, iopgd, &pt_dma, da); 583 unsigned long offset = iopte_index(da) * sizeof(da); 584 585 if (IS_ERR(iopte)) 586 return PTR_ERR(iopte); 587 588 *iopte = (pa & IOPAGE_MASK) | prot | IOPTE_SMALL; 589 flush_iopte_range(obj->dev, pt_dma, offset, 1); 590 591 dev_vdbg(obj->dev, "%s: da:%08x pa:%08x pte:%p *pte:%08x\n", 592 __func__, da, pa, iopte, *iopte); 593 594 return 0; 595} 596 597static int iopte_alloc_large(struct omap_iommu *obj, u32 da, u32 pa, u32 prot) 598{ 599 u32 *iopgd = iopgd_offset(obj, da); 600 dma_addr_t pt_dma; 601 u32 *iopte = iopte_alloc(obj, iopgd, &pt_dma, da); 602 unsigned long offset = iopte_index(da) * sizeof(da); 603 int i; 604 605 if ((da | pa) & ~IOLARGE_MASK) { 606 dev_err(obj->dev, "%s: %08x:%08x should aligned on %08lx\n", 607 __func__, da, pa, IOLARGE_SIZE); 608 return -EINVAL; 609 } 610 611 if (IS_ERR(iopte)) 612 return PTR_ERR(iopte); 613 614 for (i = 0; i < 16; i++) 615 *(iopte + i) = (pa & IOLARGE_MASK) | prot | IOPTE_LARGE; 616 flush_iopte_range(obj->dev, pt_dma, offset, 16); 617 return 0; 618} 619 620static int 621iopgtable_store_entry_core(struct omap_iommu *obj, struct iotlb_entry *e) 622{ 623 int (*fn)(struct omap_iommu *, u32, u32, u32); 624 u32 prot; 625 int err; 626 627 if (!obj || !e) 628 return -EINVAL; 629 630 switch (e->pgsz) { 631 case MMU_CAM_PGSZ_16M: 632 fn = iopgd_alloc_super; 633 break; 634 case MMU_CAM_PGSZ_1M: 635 fn = iopgd_alloc_section; 636 break; 637 case MMU_CAM_PGSZ_64K: 638 fn = iopte_alloc_large; 639 break; 640 case MMU_CAM_PGSZ_4K: 641 fn = iopte_alloc_page; 642 break; 643 default: 644 fn = NULL; 645 break; 646 } 647 648 if (WARN_ON(!fn)) 649 return -EINVAL; 650 651 prot = get_iopte_attr(e); 652 653 spin_lock(&obj->page_table_lock); 654 err = fn(obj, e->da, e->pa, prot); 655 spin_unlock(&obj->page_table_lock); 656 657 return err; 658} 659 660/** 661 * omap_iopgtable_store_entry - Make an iommu pte entry 662 * @obj: target iommu 663 * @e: an iommu tlb entry info 664 **/ 665static int 666omap_iopgtable_store_entry(struct omap_iommu *obj, struct iotlb_entry *e) 667{ 668 int err; 669 670 flush_iotlb_page(obj, e->da); 671 err = iopgtable_store_entry_core(obj, e); 672 if (!err) 673 prefetch_iotlb_entry(obj, e); 674 return err; 675} 676 677/** 678 * iopgtable_lookup_entry - Lookup an iommu pte entry 679 * @obj: target iommu 680 * @da: iommu device virtual address 681 * @ppgd: iommu pgd entry pointer to be returned 682 * @ppte: iommu pte entry pointer to be returned 683 **/ 684static void 685iopgtable_lookup_entry(struct omap_iommu *obj, u32 da, u32 **ppgd, u32 **ppte) 686{ 687 u32 *iopgd, *iopte = NULL; 688 689 iopgd = iopgd_offset(obj, da); 690 if (!*iopgd) 691 goto out; 692 693 if (iopgd_is_table(*iopgd)) 694 iopte = iopte_offset(iopgd, da); 695out: 696 *ppgd = iopgd; 697 *ppte = iopte; 698} 699 700static size_t iopgtable_clear_entry_core(struct omap_iommu *obj, u32 da) 701{ 702 size_t bytes; 703 u32 *iopgd = iopgd_offset(obj, da); 704 int nent = 1; 705 dma_addr_t pt_dma; 706 unsigned long pd_offset = iopgd_index(da) * sizeof(da); 707 unsigned long pt_offset = iopte_index(da) * sizeof(da); 708 709 if (!*iopgd) 710 return 0; 711 712 if (iopgd_is_table(*iopgd)) { 713 int i; 714 u32 *iopte = iopte_offset(iopgd, da); 715 716 bytes = IOPTE_SIZE; 717 if (*iopte & IOPTE_LARGE) { 718 nent *= 16; 719 /* rewind to the 1st entry */ 720 iopte = iopte_offset(iopgd, (da & IOLARGE_MASK)); 721 } 722 bytes *= nent; 723 memset(iopte, 0, nent * sizeof(*iopte)); 724 pt_dma = iopgd_page_paddr(iopgd); 725 flush_iopte_range(obj->dev, pt_dma, pt_offset, nent); 726 727 /* 728 * do table walk to check if this table is necessary or not 729 */ 730 iopte = iopte_offset(iopgd, 0); 731 for (i = 0; i < PTRS_PER_IOPTE; i++) 732 if (iopte[i]) 733 goto out; 734 735 iopte_free(obj, iopte, true); 736 nent = 1; /* for the next L1 entry */ 737 } else { 738 bytes = IOPGD_SIZE; 739 if ((*iopgd & IOPGD_SUPER) == IOPGD_SUPER) { 740 nent *= 16; 741 /* rewind to the 1st entry */ 742 iopgd = iopgd_offset(obj, (da & IOSUPER_MASK)); 743 } 744 bytes *= nent; 745 } 746 memset(iopgd, 0, nent * sizeof(*iopgd)); 747 flush_iopte_range(obj->dev, obj->pd_dma, pd_offset, nent); 748out: 749 return bytes; 750} 751 752/** 753 * iopgtable_clear_entry - Remove an iommu pte entry 754 * @obj: target iommu 755 * @da: iommu device virtual address 756 **/ 757static size_t iopgtable_clear_entry(struct omap_iommu *obj, u32 da) 758{ 759 size_t bytes; 760 761 spin_lock(&obj->page_table_lock); 762 763 bytes = iopgtable_clear_entry_core(obj, da); 764 flush_iotlb_page(obj, da); 765 766 spin_unlock(&obj->page_table_lock); 767 768 return bytes; 769} 770 771static void iopgtable_clear_entry_all(struct omap_iommu *obj) 772{ 773 unsigned long offset; 774 int i; 775 776 spin_lock(&obj->page_table_lock); 777 778 for (i = 0; i < PTRS_PER_IOPGD; i++) { 779 u32 da; 780 u32 *iopgd; 781 782 da = i << IOPGD_SHIFT; 783 iopgd = iopgd_offset(obj, da); 784 offset = iopgd_index(da) * sizeof(da); 785 786 if (!*iopgd) 787 continue; 788 789 if (iopgd_is_table(*iopgd)) 790 iopte_free(obj, iopte_offset(iopgd, 0), true); 791 792 *iopgd = 0; 793 flush_iopte_range(obj->dev, obj->pd_dma, offset, 1); 794 } 795 796 flush_iotlb_all(obj); 797 798 spin_unlock(&obj->page_table_lock); 799} 800 801/* 802 * Device IOMMU generic operations 803 */ 804static irqreturn_t iommu_fault_handler(int irq, void *data) 805{ 806 u32 da, errs; 807 u32 *iopgd, *iopte; 808 struct omap_iommu *obj = data; 809 struct iommu_domain *domain = obj->domain; 810 struct omap_iommu_domain *omap_domain = to_omap_domain(domain); 811 812 if (!omap_domain->dev) 813 return IRQ_NONE; 814 815 errs = iommu_report_fault(obj, &da); 816 if (errs == 0) 817 return IRQ_HANDLED; 818 819 /* Fault callback or TLB/PTE Dynamic loading */ 820 if (!report_iommu_fault(domain, obj->dev, da, 0)) 821 return IRQ_HANDLED; 822 823 iommu_write_reg(obj, 0, MMU_IRQENABLE); 824 825 iopgd = iopgd_offset(obj, da); 826 827 if (!iopgd_is_table(*iopgd)) { 828 dev_err(obj->dev, "%s: errs:0x%08x da:0x%08x pgd:0x%p *pgd:px%08x\n", 829 obj->name, errs, da, iopgd, *iopgd); 830 return IRQ_NONE; 831 } 832 833 iopte = iopte_offset(iopgd, da); 834 835 dev_err(obj->dev, "%s: errs:0x%08x da:0x%08x pgd:0x%p *pgd:0x%08x pte:0x%p *pte:0x%08x\n", 836 obj->name, errs, da, iopgd, *iopgd, iopte, *iopte); 837 838 return IRQ_NONE; 839} 840 841/** 842 * omap_iommu_attach() - attach iommu device to an iommu domain 843 * @obj: target omap iommu device 844 * @iopgd: page table 845 **/ 846static int omap_iommu_attach(struct omap_iommu *obj, u32 *iopgd) 847{ 848 int err; 849 850 spin_lock(&obj->iommu_lock); 851 852 obj->pd_dma = dma_map_single(obj->dev, iopgd, IOPGD_TABLE_SIZE, 853 DMA_TO_DEVICE); 854 if (dma_mapping_error(obj->dev, obj->pd_dma)) { 855 dev_err(obj->dev, "DMA map error for L1 table\n"); 856 err = -ENOMEM; 857 goto out_err; 858 } 859 860 obj->iopgd = iopgd; 861 err = iommu_enable(obj); 862 if (err) 863 goto out_err; 864 flush_iotlb_all(obj); 865 866 spin_unlock(&obj->iommu_lock); 867 868 dev_dbg(obj->dev, "%s: %s\n", __func__, obj->name); 869 870 return 0; 871 872out_err: 873 spin_unlock(&obj->iommu_lock); 874 875 return err; 876} 877 878/** 879 * omap_iommu_detach - release iommu device 880 * @obj: target iommu 881 **/ 882static void omap_iommu_detach(struct omap_iommu *obj) 883{ 884 if (!obj || IS_ERR(obj)) 885 return; 886 887 spin_lock(&obj->iommu_lock); 888 889 dma_unmap_single(obj->dev, obj->pd_dma, IOPGD_TABLE_SIZE, 890 DMA_TO_DEVICE); 891 obj->pd_dma = 0; 892 obj->iopgd = NULL; 893 iommu_disable(obj); 894 895 spin_unlock(&obj->iommu_lock); 896 897 dev_dbg(obj->dev, "%s: %s\n", __func__, obj->name); 898} 899 900static void omap_iommu_save_tlb_entries(struct omap_iommu *obj) 901{ 902 struct iotlb_lock lock; 903 struct cr_regs cr; 904 struct cr_regs *tmp; 905 int i; 906 907 /* check if there are any locked tlbs to save */ 908 iotlb_lock_get(obj, &lock); 909 obj->num_cr_ctx = lock.base; 910 if (!obj->num_cr_ctx) 911 return; 912 913 tmp = obj->cr_ctx; 914 for_each_iotlb_cr(obj, obj->num_cr_ctx, i, cr) 915 * tmp++ = cr; 916} 917 918static void omap_iommu_restore_tlb_entries(struct omap_iommu *obj) 919{ 920 struct iotlb_lock l; 921 struct cr_regs *tmp; 922 int i; 923 924 /* no locked tlbs to restore */ 925 if (!obj->num_cr_ctx) 926 return; 927 928 l.base = 0; 929 tmp = obj->cr_ctx; 930 for (i = 0; i < obj->num_cr_ctx; i++, tmp++) { 931 l.vict = i; 932 iotlb_lock_set(obj, &l); 933 iotlb_load_cr(obj, tmp); 934 } 935 l.base = obj->num_cr_ctx; 936 l.vict = i; 937 iotlb_lock_set(obj, &l); 938} 939 940/** 941 * omap_iommu_domain_deactivate - deactivate attached iommu devices 942 * @domain: iommu domain attached to the target iommu device 943 * 944 * This API allows the client devices of IOMMU devices to suspend 945 * the IOMMUs they control at runtime, after they are idled and 946 * suspended all activity. System Suspend will leverage the PM 947 * driver late callbacks. 948 **/ 949int omap_iommu_domain_deactivate(struct iommu_domain *domain) 950{ 951 struct omap_iommu_domain *omap_domain = to_omap_domain(domain); 952 struct omap_iommu_device *iommu; 953 struct omap_iommu *oiommu; 954 int i; 955 956 if (!omap_domain->dev) 957 return 0; 958 959 iommu = omap_domain->iommus; 960 iommu += (omap_domain->num_iommus - 1); 961 for (i = 0; i < omap_domain->num_iommus; i++, iommu--) { 962 oiommu = iommu->iommu_dev; 963 pm_runtime_put_sync(oiommu->dev); 964 } 965 966 return 0; 967} 968EXPORT_SYMBOL_GPL(omap_iommu_domain_deactivate); 969 970/** 971 * omap_iommu_domain_activate - activate attached iommu devices 972 * @domain: iommu domain attached to the target iommu device 973 * 974 * This API allows the client devices of IOMMU devices to resume the 975 * IOMMUs they control at runtime, before they can resume operations. 976 * System Resume will leverage the PM driver late callbacks. 977 **/ 978int omap_iommu_domain_activate(struct iommu_domain *domain) 979{ 980 struct omap_iommu_domain *omap_domain = to_omap_domain(domain); 981 struct omap_iommu_device *iommu; 982 struct omap_iommu *oiommu; 983 int i; 984 985 if (!omap_domain->dev) 986 return 0; 987 988 iommu = omap_domain->iommus; 989 for (i = 0; i < omap_domain->num_iommus; i++, iommu++) { 990 oiommu = iommu->iommu_dev; 991 pm_runtime_get_sync(oiommu->dev); 992 } 993 994 return 0; 995} 996EXPORT_SYMBOL_GPL(omap_iommu_domain_activate); 997 998/** 999 * omap_iommu_runtime_suspend - disable an iommu device 1000 * @dev: iommu device 1001 * 1002 * This function performs all that is necessary to disable an 1003 * IOMMU device, either during final detachment from a client 1004 * device, or during system/runtime suspend of the device. This 1005 * includes programming all the appropriate IOMMU registers, and 1006 * managing the associated omap_hwmod's state and the device's 1007 * reset line. This function also saves the context of any 1008 * locked TLBs if suspending. 1009 **/ 1010static __maybe_unused int omap_iommu_runtime_suspend(struct device *dev) 1011{ 1012 struct platform_device *pdev = to_platform_device(dev); 1013 struct iommu_platform_data *pdata = dev_get_platdata(dev); 1014 struct omap_iommu *obj = to_iommu(dev); 1015 int ret; 1016 1017 /* save the TLBs only during suspend, and not for power down */ 1018 if (obj->domain && obj->iopgd) 1019 omap_iommu_save_tlb_entries(obj); 1020 1021 omap2_iommu_disable(obj); 1022 1023 if (pdata && pdata->device_idle) 1024 pdata->device_idle(pdev); 1025 1026 if (pdata && pdata->assert_reset) 1027 pdata->assert_reset(pdev, pdata->reset_name); 1028 1029 if (pdata && pdata->set_pwrdm_constraint) { 1030 ret = pdata->set_pwrdm_constraint(pdev, false, &obj->pwrst); 1031 if (ret) { 1032 dev_warn(obj->dev, "pwrdm_constraint failed to be reset, status = %d\n", 1033 ret); 1034 } 1035 } 1036 1037 return 0; 1038} 1039 1040/** 1041 * omap_iommu_runtime_resume - enable an iommu device 1042 * @dev: iommu device 1043 * 1044 * This function performs all that is necessary to enable an 1045 * IOMMU device, either during initial attachment to a client 1046 * device, or during system/runtime resume of the device. This 1047 * includes programming all the appropriate IOMMU registers, and 1048 * managing the associated omap_hwmod's state and the device's 1049 * reset line. The function also restores any locked TLBs if 1050 * resuming after a suspend. 1051 **/ 1052static __maybe_unused int omap_iommu_runtime_resume(struct device *dev) 1053{ 1054 struct platform_device *pdev = to_platform_device(dev); 1055 struct iommu_platform_data *pdata = dev_get_platdata(dev); 1056 struct omap_iommu *obj = to_iommu(dev); 1057 int ret = 0; 1058 1059 if (pdata && pdata->set_pwrdm_constraint) { 1060 ret = pdata->set_pwrdm_constraint(pdev, true, &obj->pwrst); 1061 if (ret) { 1062 dev_warn(obj->dev, "pwrdm_constraint failed to be set, status = %d\n", 1063 ret); 1064 } 1065 } 1066 1067 if (pdata && pdata->deassert_reset) { 1068 ret = pdata->deassert_reset(pdev, pdata->reset_name); 1069 if (ret) { 1070 dev_err(dev, "deassert_reset failed: %d\n", ret); 1071 return ret; 1072 } 1073 } 1074 1075 if (pdata && pdata->device_enable) 1076 pdata->device_enable(pdev); 1077 1078 /* restore the TLBs only during resume, and not for power up */ 1079 if (obj->domain) 1080 omap_iommu_restore_tlb_entries(obj); 1081 1082 ret = omap2_iommu_enable(obj); 1083 1084 return ret; 1085} 1086 1087/** 1088 * omap_iommu_prepare - prepare() dev_pm_ops implementation 1089 * @dev: iommu device 1090 * 1091 * This function performs the necessary checks to determine if the IOMMU 1092 * device needs suspending or not. The function checks if the runtime_pm 1093 * status of the device is suspended, and returns 1 in that case. This 1094 * results in the PM core to skip invoking any of the Sleep PM callbacks 1095 * (suspend, suspend_late, resume, resume_early etc). 1096 */ 1097static int omap_iommu_prepare(struct device *dev) 1098{ 1099 if (pm_runtime_status_suspended(dev)) 1100 return 1; 1101 return 0; 1102} 1103 1104static bool omap_iommu_can_register(struct platform_device *pdev) 1105{ 1106 struct device_node *np = pdev->dev.of_node; 1107 1108 if (!of_device_is_compatible(np, "ti,dra7-dsp-iommu")) 1109 return true; 1110 1111 /* 1112 * restrict IOMMU core registration only for processor-port MDMA MMUs 1113 * on DRA7 DSPs 1114 */ 1115 if ((!strcmp(dev_name(&pdev->dev), "40d01000.mmu")) || 1116 (!strcmp(dev_name(&pdev->dev), "41501000.mmu"))) 1117 return true; 1118 1119 return false; 1120} 1121 1122static int omap_iommu_dra7_get_dsp_system_cfg(struct platform_device *pdev, 1123 struct omap_iommu *obj) 1124{ 1125 struct device_node *np = pdev->dev.of_node; 1126 int ret; 1127 1128 if (!of_device_is_compatible(np, "ti,dra7-dsp-iommu")) 1129 return 0; 1130 1131 if (!of_property_read_bool(np, "ti,syscon-mmuconfig")) { 1132 dev_err(&pdev->dev, "ti,syscon-mmuconfig property is missing\n"); 1133 return -EINVAL; 1134 } 1135 1136 obj->syscfg = 1137 syscon_regmap_lookup_by_phandle(np, "ti,syscon-mmuconfig"); 1138 if (IS_ERR(obj->syscfg)) { 1139 /* can fail with -EPROBE_DEFER */ 1140 ret = PTR_ERR(obj->syscfg); 1141 return ret; 1142 } 1143 1144 if (of_property_read_u32_index(np, "ti,syscon-mmuconfig", 1, 1145 &obj->id)) { 1146 dev_err(&pdev->dev, "couldn't get the IOMMU instance id within subsystem\n"); 1147 return -EINVAL; 1148 } 1149 1150 if (obj->id != 0 && obj->id != 1) { 1151 dev_err(&pdev->dev, "invalid IOMMU instance id\n"); 1152 return -EINVAL; 1153 } 1154 1155 return 0; 1156} 1157 1158/* 1159 * OMAP Device MMU(IOMMU) detection 1160 */ 1161static int omap_iommu_probe(struct platform_device *pdev) 1162{ 1163 int err = -ENODEV; 1164 int irq; 1165 struct omap_iommu *obj; 1166 struct resource *res; 1167 struct device_node *of = pdev->dev.of_node; 1168 1169 if (!of) { 1170 pr_err("%s: only DT-based devices are supported\n", __func__); 1171 return -ENODEV; 1172 } 1173 1174 obj = devm_kzalloc(&pdev->dev, sizeof(*obj) + MMU_REG_SIZE, GFP_KERNEL); 1175 if (!obj) 1176 return -ENOMEM; 1177 1178 /* 1179 * self-manage the ordering dependencies between omap_device_enable/idle 1180 * and omap_device_assert/deassert_hardreset API 1181 */ 1182 if (pdev->dev.pm_domain) { 1183 dev_dbg(&pdev->dev, "device pm_domain is being reset\n"); 1184 pdev->dev.pm_domain = NULL; 1185 } 1186 1187 obj->name = dev_name(&pdev->dev); 1188 obj->nr_tlb_entries = 32; 1189 err = of_property_read_u32(of, "ti,#tlb-entries", &obj->nr_tlb_entries); 1190 if (err && err != -EINVAL) 1191 return err; 1192 if (obj->nr_tlb_entries != 32 && obj->nr_tlb_entries != 8) 1193 return -EINVAL; 1194 if (of_property_read_bool(of, "ti,iommu-bus-err-back")) 1195 obj->has_bus_err_back = MMU_GP_REG_BUS_ERR_BACK_EN; 1196 1197 obj->dev = &pdev->dev; 1198 obj->ctx = (void *)obj + sizeof(*obj); 1199 obj->cr_ctx = devm_kzalloc(&pdev->dev, 1200 sizeof(*obj->cr_ctx) * obj->nr_tlb_entries, 1201 GFP_KERNEL); 1202 if (!obj->cr_ctx) 1203 return -ENOMEM; 1204 1205 spin_lock_init(&obj->iommu_lock); 1206 spin_lock_init(&obj->page_table_lock); 1207 1208 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 1209 obj->regbase = devm_ioremap_resource(obj->dev, res); 1210 if (IS_ERR(obj->regbase)) 1211 return PTR_ERR(obj->regbase); 1212 1213 err = omap_iommu_dra7_get_dsp_system_cfg(pdev, obj); 1214 if (err) 1215 return err; 1216 1217 irq = platform_get_irq(pdev, 0); 1218 if (irq < 0) 1219 return -ENODEV; 1220 1221 err = devm_request_irq(obj->dev, irq, iommu_fault_handler, IRQF_SHARED, 1222 dev_name(obj->dev), obj); 1223 if (err < 0) 1224 return err; 1225 platform_set_drvdata(pdev, obj); 1226 1227 if (omap_iommu_can_register(pdev)) { 1228 obj->group = iommu_group_alloc(); 1229 if (IS_ERR(obj->group)) 1230 return PTR_ERR(obj->group); 1231 1232 err = iommu_device_sysfs_add(&obj->iommu, obj->dev, NULL, 1233 obj->name); 1234 if (err) 1235 goto out_group; 1236 1237 err = iommu_device_register(&obj->iommu, &omap_iommu_ops, &pdev->dev); 1238 if (err) 1239 goto out_sysfs; 1240 } 1241 1242 pm_runtime_enable(obj->dev); 1243 1244 omap_iommu_debugfs_add(obj); 1245 1246 dev_info(&pdev->dev, "%s registered\n", obj->name); 1247 1248 /* Re-probe bus to probe device attached to this IOMMU */ 1249 bus_iommu_probe(&platform_bus_type); 1250 1251 return 0; 1252 1253out_sysfs: 1254 iommu_device_sysfs_remove(&obj->iommu); 1255out_group: 1256 iommu_group_put(obj->group); 1257 return err; 1258} 1259 1260static void omap_iommu_remove(struct platform_device *pdev) 1261{ 1262 struct omap_iommu *obj = platform_get_drvdata(pdev); 1263 1264 if (obj->group) { 1265 iommu_group_put(obj->group); 1266 obj->group = NULL; 1267 1268 iommu_device_sysfs_remove(&obj->iommu); 1269 iommu_device_unregister(&obj->iommu); 1270 } 1271 1272 omap_iommu_debugfs_remove(obj); 1273 1274 pm_runtime_disable(obj->dev); 1275 1276 dev_info(&pdev->dev, "%s removed\n", obj->name); 1277} 1278 1279static const struct dev_pm_ops omap_iommu_pm_ops = { 1280 .prepare = omap_iommu_prepare, 1281 SET_LATE_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend, 1282 pm_runtime_force_resume) 1283 SET_RUNTIME_PM_OPS(omap_iommu_runtime_suspend, 1284 omap_iommu_runtime_resume, NULL) 1285}; 1286 1287static const struct of_device_id omap_iommu_of_match[] = { 1288 { .compatible = "ti,omap2-iommu" }, 1289 { .compatible = "ti,omap4-iommu" }, 1290 { .compatible = "ti,dra7-iommu" }, 1291 { .compatible = "ti,dra7-dsp-iommu" }, 1292 {}, 1293}; 1294 1295static struct platform_driver omap_iommu_driver = { 1296 .probe = omap_iommu_probe, 1297 .remove_new = omap_iommu_remove, 1298 .driver = { 1299 .name = "omap-iommu", 1300 .pm = &omap_iommu_pm_ops, 1301 .of_match_table = of_match_ptr(omap_iommu_of_match), 1302 }, 1303}; 1304 1305static u32 iotlb_init_entry(struct iotlb_entry *e, u32 da, u32 pa, int pgsz) 1306{ 1307 memset(e, 0, sizeof(*e)); 1308 1309 e->da = da; 1310 e->pa = pa; 1311 e->valid = MMU_CAM_V; 1312 e->pgsz = pgsz; 1313 e->endian = MMU_RAM_ENDIAN_LITTLE; 1314 e->elsz = MMU_RAM_ELSZ_8; 1315 e->mixed = 0; 1316 1317 return iopgsz_to_bytes(e->pgsz); 1318} 1319 1320static int omap_iommu_map(struct iommu_domain *domain, unsigned long da, 1321 phys_addr_t pa, size_t bytes, int prot, gfp_t gfp) 1322{ 1323 struct omap_iommu_domain *omap_domain = to_omap_domain(domain); 1324 struct device *dev = omap_domain->dev; 1325 struct omap_iommu_device *iommu; 1326 struct omap_iommu *oiommu; 1327 struct iotlb_entry e; 1328 int omap_pgsz; 1329 u32 ret = -EINVAL; 1330 int i; 1331 1332 omap_pgsz = bytes_to_iopgsz(bytes); 1333 if (omap_pgsz < 0) { 1334 dev_err(dev, "invalid size to map: %zu\n", bytes); 1335 return -EINVAL; 1336 } 1337 1338 dev_dbg(dev, "mapping da 0x%lx to pa %pa size 0x%zx\n", da, &pa, bytes); 1339 1340 iotlb_init_entry(&e, da, pa, omap_pgsz); 1341 1342 iommu = omap_domain->iommus; 1343 for (i = 0; i < omap_domain->num_iommus; i++, iommu++) { 1344 oiommu = iommu->iommu_dev; 1345 ret = omap_iopgtable_store_entry(oiommu, &e); 1346 if (ret) { 1347 dev_err(dev, "omap_iopgtable_store_entry failed: %d\n", 1348 ret); 1349 break; 1350 } 1351 } 1352 1353 if (ret) { 1354 while (i--) { 1355 iommu--; 1356 oiommu = iommu->iommu_dev; 1357 iopgtable_clear_entry(oiommu, da); 1358 } 1359 } 1360 1361 return ret; 1362} 1363 1364static size_t omap_iommu_unmap(struct iommu_domain *domain, unsigned long da, 1365 size_t size, struct iommu_iotlb_gather *gather) 1366{ 1367 struct omap_iommu_domain *omap_domain = to_omap_domain(domain); 1368 struct device *dev = omap_domain->dev; 1369 struct omap_iommu_device *iommu; 1370 struct omap_iommu *oiommu; 1371 bool error = false; 1372 size_t bytes = 0; 1373 int i; 1374 1375 dev_dbg(dev, "unmapping da 0x%lx size %zu\n", da, size); 1376 1377 iommu = omap_domain->iommus; 1378 for (i = 0; i < omap_domain->num_iommus; i++, iommu++) { 1379 oiommu = iommu->iommu_dev; 1380 bytes = iopgtable_clear_entry(oiommu, da); 1381 if (!bytes) 1382 error = true; 1383 } 1384 1385 /* 1386 * simplify return - we are only checking if any of the iommus 1387 * reported an error, but not if all of them are unmapping the 1388 * same number of entries. This should not occur due to the 1389 * mirror programming. 1390 */ 1391 return error ? 0 : bytes; 1392} 1393 1394static int omap_iommu_count(struct device *dev) 1395{ 1396 struct omap_iommu_arch_data *arch_data = dev_iommu_priv_get(dev); 1397 int count = 0; 1398 1399 while (arch_data->iommu_dev) { 1400 count++; 1401 arch_data++; 1402 } 1403 1404 return count; 1405} 1406 1407/* caller should call cleanup if this function fails */ 1408static int omap_iommu_attach_init(struct device *dev, 1409 struct omap_iommu_domain *odomain) 1410{ 1411 struct omap_iommu_device *iommu; 1412 int i; 1413 1414 odomain->num_iommus = omap_iommu_count(dev); 1415 if (!odomain->num_iommus) 1416 return -ENODEV; 1417 1418 odomain->iommus = kcalloc(odomain->num_iommus, sizeof(*iommu), 1419 GFP_ATOMIC); 1420 if (!odomain->iommus) 1421 return -ENOMEM; 1422 1423 iommu = odomain->iommus; 1424 for (i = 0; i < odomain->num_iommus; i++, iommu++) { 1425 iommu->pgtable = kzalloc(IOPGD_TABLE_SIZE, GFP_ATOMIC); 1426 if (!iommu->pgtable) 1427 return -ENOMEM; 1428 1429 /* 1430 * should never fail, but please keep this around to ensure 1431 * we keep the hardware happy 1432 */ 1433 if (WARN_ON(!IS_ALIGNED((long)iommu->pgtable, 1434 IOPGD_TABLE_SIZE))) 1435 return -EINVAL; 1436 } 1437 1438 return 0; 1439} 1440 1441static void omap_iommu_detach_fini(struct omap_iommu_domain *odomain) 1442{ 1443 int i; 1444 struct omap_iommu_device *iommu = odomain->iommus; 1445 1446 for (i = 0; iommu && i < odomain->num_iommus; i++, iommu++) 1447 kfree(iommu->pgtable); 1448 1449 kfree(odomain->iommus); 1450 odomain->num_iommus = 0; 1451 odomain->iommus = NULL; 1452} 1453 1454static int 1455omap_iommu_attach_dev(struct iommu_domain *domain, struct device *dev) 1456{ 1457 struct omap_iommu_arch_data *arch_data = dev_iommu_priv_get(dev); 1458 struct omap_iommu_domain *omap_domain = to_omap_domain(domain); 1459 struct omap_iommu_device *iommu; 1460 struct omap_iommu *oiommu; 1461 int ret = 0; 1462 int i; 1463 1464 if (!arch_data || !arch_data->iommu_dev) { 1465 dev_err(dev, "device doesn't have an associated iommu\n"); 1466 return -ENODEV; 1467 } 1468 1469 spin_lock(&omap_domain->lock); 1470 1471 /* only a single client device can be attached to a domain */ 1472 if (omap_domain->dev) { 1473 dev_err(dev, "iommu domain is already attached\n"); 1474 ret = -EINVAL; 1475 goto out; 1476 } 1477 1478 ret = omap_iommu_attach_init(dev, omap_domain); 1479 if (ret) { 1480 dev_err(dev, "failed to allocate required iommu data %d\n", 1481 ret); 1482 goto init_fail; 1483 } 1484 1485 iommu = omap_domain->iommus; 1486 for (i = 0; i < omap_domain->num_iommus; i++, iommu++, arch_data++) { 1487 /* configure and enable the omap iommu */ 1488 oiommu = arch_data->iommu_dev; 1489 ret = omap_iommu_attach(oiommu, iommu->pgtable); 1490 if (ret) { 1491 dev_err(dev, "can't get omap iommu: %d\n", ret); 1492 goto attach_fail; 1493 } 1494 1495 oiommu->domain = domain; 1496 iommu->iommu_dev = oiommu; 1497 } 1498 1499 omap_domain->dev = dev; 1500 1501 goto out; 1502 1503attach_fail: 1504 while (i--) { 1505 iommu--; 1506 arch_data--; 1507 oiommu = iommu->iommu_dev; 1508 omap_iommu_detach(oiommu); 1509 iommu->iommu_dev = NULL; 1510 oiommu->domain = NULL; 1511 } 1512init_fail: 1513 omap_iommu_detach_fini(omap_domain); 1514out: 1515 spin_unlock(&omap_domain->lock); 1516 return ret; 1517} 1518 1519static void _omap_iommu_detach_dev(struct omap_iommu_domain *omap_domain, 1520 struct device *dev) 1521{ 1522 struct omap_iommu_arch_data *arch_data = dev_iommu_priv_get(dev); 1523 struct omap_iommu_device *iommu = omap_domain->iommus; 1524 struct omap_iommu *oiommu; 1525 int i; 1526 1527 if (!omap_domain->dev) { 1528 dev_err(dev, "domain has no attached device\n"); 1529 return; 1530 } 1531 1532 /* only a single device is supported per domain for now */ 1533 if (omap_domain->dev != dev) { 1534 dev_err(dev, "invalid attached device\n"); 1535 return; 1536 } 1537 1538 /* 1539 * cleanup in the reverse order of attachment - this addresses 1540 * any h/w dependencies between multiple instances, if any 1541 */ 1542 iommu += (omap_domain->num_iommus - 1); 1543 arch_data += (omap_domain->num_iommus - 1); 1544 for (i = 0; i < omap_domain->num_iommus; i++, iommu--, arch_data--) { 1545 oiommu = iommu->iommu_dev; 1546 iopgtable_clear_entry_all(oiommu); 1547 1548 omap_iommu_detach(oiommu); 1549 iommu->iommu_dev = NULL; 1550 oiommu->domain = NULL; 1551 } 1552 1553 omap_iommu_detach_fini(omap_domain); 1554 1555 omap_domain->dev = NULL; 1556} 1557 1558static void omap_iommu_set_platform_dma(struct device *dev) 1559{ 1560 struct iommu_domain *domain = iommu_get_domain_for_dev(dev); 1561 struct omap_iommu_domain *omap_domain = to_omap_domain(domain); 1562 1563 spin_lock(&omap_domain->lock); 1564 _omap_iommu_detach_dev(omap_domain, dev); 1565 spin_unlock(&omap_domain->lock); 1566} 1567 1568static struct iommu_domain *omap_iommu_domain_alloc(unsigned type) 1569{ 1570 struct omap_iommu_domain *omap_domain; 1571 1572 if (type != IOMMU_DOMAIN_UNMANAGED) 1573 return NULL; 1574 1575 omap_domain = kzalloc(sizeof(*omap_domain), GFP_KERNEL); 1576 if (!omap_domain) 1577 return NULL; 1578 1579 spin_lock_init(&omap_domain->lock); 1580 1581 omap_domain->domain.geometry.aperture_start = 0; 1582 omap_domain->domain.geometry.aperture_end = (1ULL << 32) - 1; 1583 omap_domain->domain.geometry.force_aperture = true; 1584 1585 return &omap_domain->domain; 1586} 1587 1588static void omap_iommu_domain_free(struct iommu_domain *domain) 1589{ 1590 struct omap_iommu_domain *omap_domain = to_omap_domain(domain); 1591 1592 /* 1593 * An iommu device is still attached 1594 * (currently, only one device can be attached) ? 1595 */ 1596 if (omap_domain->dev) 1597 _omap_iommu_detach_dev(omap_domain, omap_domain->dev); 1598 1599 kfree(omap_domain); 1600} 1601 1602static phys_addr_t omap_iommu_iova_to_phys(struct iommu_domain *domain, 1603 dma_addr_t da) 1604{ 1605 struct omap_iommu_domain *omap_domain = to_omap_domain(domain); 1606 struct omap_iommu_device *iommu = omap_domain->iommus; 1607 struct omap_iommu *oiommu = iommu->iommu_dev; 1608 struct device *dev = oiommu->dev; 1609 u32 *pgd, *pte; 1610 phys_addr_t ret = 0; 1611 1612 /* 1613 * all the iommus within the domain will have identical programming, 1614 * so perform the lookup using just the first iommu 1615 */ 1616 iopgtable_lookup_entry(oiommu, da, &pgd, &pte); 1617 1618 if (pte) { 1619 if (iopte_is_small(*pte)) 1620 ret = omap_iommu_translate(*pte, da, IOPTE_MASK); 1621 else if (iopte_is_large(*pte)) 1622 ret = omap_iommu_translate(*pte, da, IOLARGE_MASK); 1623 else 1624 dev_err(dev, "bogus pte 0x%x, da 0x%llx", *pte, 1625 (unsigned long long)da); 1626 } else { 1627 if (iopgd_is_section(*pgd)) 1628 ret = omap_iommu_translate(*pgd, da, IOSECTION_MASK); 1629 else if (iopgd_is_super(*pgd)) 1630 ret = omap_iommu_translate(*pgd, da, IOSUPER_MASK); 1631 else 1632 dev_err(dev, "bogus pgd 0x%x, da 0x%llx", *pgd, 1633 (unsigned long long)da); 1634 } 1635 1636 return ret; 1637} 1638 1639static struct iommu_device *omap_iommu_probe_device(struct device *dev) 1640{ 1641 struct omap_iommu_arch_data *arch_data, *tmp; 1642 struct platform_device *pdev; 1643 struct omap_iommu *oiommu; 1644 struct device_node *np; 1645 int num_iommus, i; 1646 1647 /* 1648 * Allocate the per-device iommu structure for DT-based devices. 1649 * 1650 * TODO: Simplify this when removing non-DT support completely from the 1651 * IOMMU users. 1652 */ 1653 if (!dev->of_node) 1654 return ERR_PTR(-ENODEV); 1655 1656 /* 1657 * retrieve the count of IOMMU nodes using phandle size as element size 1658 * since #iommu-cells = 0 for OMAP 1659 */ 1660 num_iommus = of_property_count_elems_of_size(dev->of_node, "iommus", 1661 sizeof(phandle)); 1662 if (num_iommus < 0) 1663 return ERR_PTR(-ENODEV); 1664 1665 arch_data = kcalloc(num_iommus + 1, sizeof(*arch_data), GFP_KERNEL); 1666 if (!arch_data) 1667 return ERR_PTR(-ENOMEM); 1668 1669 for (i = 0, tmp = arch_data; i < num_iommus; i++, tmp++) { 1670 np = of_parse_phandle(dev->of_node, "iommus", i); 1671 if (!np) { 1672 kfree(arch_data); 1673 return ERR_PTR(-EINVAL); 1674 } 1675 1676 pdev = of_find_device_by_node(np); 1677 if (!pdev) { 1678 of_node_put(np); 1679 kfree(arch_data); 1680 return ERR_PTR(-ENODEV); 1681 } 1682 1683 oiommu = platform_get_drvdata(pdev); 1684 if (!oiommu) { 1685 of_node_put(np); 1686 kfree(arch_data); 1687 return ERR_PTR(-EINVAL); 1688 } 1689 1690 tmp->iommu_dev = oiommu; 1691 tmp->dev = &pdev->dev; 1692 1693 of_node_put(np); 1694 } 1695 1696 dev_iommu_priv_set(dev, arch_data); 1697 1698 /* 1699 * use the first IOMMU alone for the sysfs device linking. 1700 * TODO: Evaluate if a single iommu_group needs to be 1701 * maintained for both IOMMUs 1702 */ 1703 oiommu = arch_data->iommu_dev; 1704 1705 return &oiommu->iommu; 1706} 1707 1708static void omap_iommu_release_device(struct device *dev) 1709{ 1710 struct omap_iommu_arch_data *arch_data = dev_iommu_priv_get(dev); 1711 1712 if (!dev->of_node || !arch_data) 1713 return; 1714 1715 dev_iommu_priv_set(dev, NULL); 1716 kfree(arch_data); 1717 1718} 1719 1720static struct iommu_group *omap_iommu_device_group(struct device *dev) 1721{ 1722 struct omap_iommu_arch_data *arch_data = dev_iommu_priv_get(dev); 1723 struct iommu_group *group = ERR_PTR(-EINVAL); 1724 1725 if (!arch_data) 1726 return ERR_PTR(-ENODEV); 1727 1728 if (arch_data->iommu_dev) 1729 group = iommu_group_ref_get(arch_data->iommu_dev->group); 1730 1731 return group; 1732} 1733 1734static const struct iommu_ops omap_iommu_ops = { 1735 .domain_alloc = omap_iommu_domain_alloc, 1736 .probe_device = omap_iommu_probe_device, 1737 .release_device = omap_iommu_release_device, 1738 .device_group = omap_iommu_device_group, 1739 .set_platform_dma_ops = omap_iommu_set_platform_dma, 1740 .pgsize_bitmap = OMAP_IOMMU_PGSIZES, 1741 .default_domain_ops = &(const struct iommu_domain_ops) { 1742 .attach_dev = omap_iommu_attach_dev, 1743 .map = omap_iommu_map, 1744 .unmap = omap_iommu_unmap, 1745 .iova_to_phys = omap_iommu_iova_to_phys, 1746 .free = omap_iommu_domain_free, 1747 } 1748}; 1749 1750static int __init omap_iommu_init(void) 1751{ 1752 struct kmem_cache *p; 1753 const slab_flags_t flags = SLAB_HWCACHE_ALIGN; 1754 size_t align = 1 << 10; /* L2 pagetable alignement */ 1755 struct device_node *np; 1756 int ret; 1757 1758 np = of_find_matching_node(NULL, omap_iommu_of_match); 1759 if (!np) 1760 return 0; 1761 1762 of_node_put(np); 1763 1764 p = kmem_cache_create("iopte_cache", IOPTE_TABLE_SIZE, align, flags, 1765 NULL); 1766 if (!p) 1767 return -ENOMEM; 1768 iopte_cachep = p; 1769 1770 omap_iommu_debugfs_init(); 1771 1772 ret = platform_driver_register(&omap_iommu_driver); 1773 if (ret) { 1774 pr_err("%s: failed to register driver\n", __func__); 1775 goto fail_driver; 1776 } 1777 1778 return 0; 1779 1780fail_driver: 1781 kmem_cache_destroy(iopte_cachep); 1782 return ret; 1783} 1784subsys_initcall(omap_iommu_init); 1785/* must be ready before omap3isp is probed */ 1786