1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Apple DART (Device Address Resolution Table) IOMMU driver 4 * 5 * Copyright (C) 2021 The Asahi Linux Contributors 6 * 7 * Based on arm/arm-smmu/arm-ssmu.c and arm/arm-smmu-v3/arm-smmu-v3.c 8 * Copyright (C) 2013 ARM Limited 9 * Copyright (C) 2015 ARM Limited 10 * and on exynos-iommu.c 11 * Copyright (c) 2011,2016 Samsung Electronics Co., Ltd. 12 */ 13 14 #include <linux/atomic.h> 15 #include <linux/bitfield.h> 16 #include <linux/clk.h> 17 #include <linux/dev_printk.h> 18 #include <linux/dma-mapping.h> 19 #include <linux/err.h> 20 #include <linux/interrupt.h> 21 #include <linux/io-pgtable.h> 22 #include <linux/iommu.h> 23 #include <linux/iopoll.h> 24 #include <linux/module.h> 25 #include <linux/of.h> 26 #include <linux/of_address.h> 27 #include <linux/of_iommu.h> 28 #include <linux/of_platform.h> 29 #include <linux/pci.h> 30 #include <linux/platform_device.h> 31 #include <linux/slab.h> 32 #include <linux/swab.h> 33 #include <linux/types.h> 34 35 #include "dma-iommu.h" 36 37 #define DART_MAX_STREAMS 256 38 #define DART_MAX_TTBR 4 39 #define MAX_DARTS_PER_DEVICE 2 40 41 /* Common registers */ 42 43 #define DART_PARAMS1 0x00 44 #define DART_PARAMS1_PAGE_SHIFT GENMASK(27, 24) 45 46 #define DART_PARAMS2 0x04 47 #define DART_PARAMS2_BYPASS_SUPPORT BIT(0) 48 49 /* T8020/T6000 registers */ 50 51 #define DART_T8020_STREAM_COMMAND 0x20 52 #define DART_T8020_STREAM_COMMAND_BUSY BIT(2) 53 #define DART_T8020_STREAM_COMMAND_INVALIDATE BIT(20) 54 55 #define DART_T8020_STREAM_SELECT 0x34 56 57 #define DART_T8020_ERROR 0x40 58 #define DART_T8020_ERROR_STREAM GENMASK(27, 24) 59 #define DART_T8020_ERROR_CODE GENMASK(11, 0) 60 #define DART_T8020_ERROR_FLAG BIT(31) 61 62 #define DART_T8020_ERROR_READ_FAULT BIT(4) 63 #define DART_T8020_ERROR_WRITE_FAULT BIT(3) 64 #define DART_T8020_ERROR_NO_PTE BIT(2) 65 #define DART_T8020_ERROR_NO_PMD BIT(1) 66 #define DART_T8020_ERROR_NO_TTBR BIT(0) 67 68 #define DART_T8020_CONFIG 0x60 69 #define DART_T8020_CONFIG_LOCK BIT(15) 70 71 #define DART_STREAM_COMMAND_BUSY_TIMEOUT 100 72 73 #define DART_T8020_ERROR_ADDR_HI 0x54 74 #define DART_T8020_ERROR_ADDR_LO 0x50 75 76 #define DART_T8020_STREAMS_ENABLE 0xfc 77 78 #define DART_T8020_TCR 0x100 79 #define DART_T8020_TCR_TRANSLATE_ENABLE BIT(7) 80 #define DART_T8020_TCR_BYPASS_DART BIT(8) 81 #define DART_T8020_TCR_BYPASS_DAPF BIT(12) 82 83 #define DART_T8020_TTBR 0x200 84 #define DART_T8020_TTBR_VALID BIT(31) 85 #define DART_T8020_TTBR_ADDR_FIELD_SHIFT 0 86 #define DART_T8020_TTBR_SHIFT 12 87 88 /* T8110 registers */ 89 90 #define DART_T8110_PARAMS3 0x08 91 #define DART_T8110_PARAMS3_PA_WIDTH GENMASK(29, 24) 92 #define DART_T8110_PARAMS3_VA_WIDTH GENMASK(21, 16) 93 #define DART_T8110_PARAMS3_VER_MAJ GENMASK(15, 8) 94 #define DART_T8110_PARAMS3_VER_MIN GENMASK(7, 0) 95 96 #define DART_T8110_PARAMS4 0x0c 97 #define DART_T8110_PARAMS4_NUM_CLIENTS GENMASK(24, 16) 98 #define DART_T8110_PARAMS4_NUM_SIDS GENMASK(8, 0) 99 100 #define DART_T8110_TLB_CMD 0x80 101 #define DART_T8110_TLB_CMD_BUSY BIT(31) 102 #define DART_T8110_TLB_CMD_OP GENMASK(10, 8) 103 #define DART_T8110_TLB_CMD_OP_FLUSH_ALL 0 104 #define DART_T8110_TLB_CMD_OP_FLUSH_SID 1 105 #define DART_T8110_TLB_CMD_STREAM GENMASK(7, 0) 106 107 #define DART_T8110_ERROR 0x100 108 #define DART_T8110_ERROR_STREAM GENMASK(27, 20) 109 #define DART_T8110_ERROR_CODE GENMASK(14, 0) 110 #define DART_T8110_ERROR_FLAG BIT(31) 111 112 #define DART_T8110_ERROR_MASK 0x104 113 114 #define DART_T8110_ERROR_READ_FAULT BIT(5) 115 #define DART_T8110_ERROR_WRITE_FAULT BIT(4) 116 #define DART_T8110_ERROR_NO_PTE BIT(3) 117 #define DART_T8110_ERROR_NO_PMD BIT(2) 118 #define DART_T8110_ERROR_NO_PGD BIT(1) 119 #define DART_T8110_ERROR_NO_TTBR BIT(0) 120 121 #define DART_T8110_ERROR_ADDR_LO 0x170 122 #define DART_T8110_ERROR_ADDR_HI 0x174 123 124 #define DART_T8110_PROTECT 0x200 125 #define DART_T8110_UNPROTECT 0x204 126 #define DART_T8110_PROTECT_LOCK 0x208 127 #define DART_T8110_PROTECT_TTBR_TCR BIT(0) 128 129 #define DART_T8110_ENABLE_STREAMS 0xc00 130 #define DART_T8110_DISABLE_STREAMS 0xc20 131 132 #define DART_T8110_TCR 0x1000 133 #define DART_T8110_TCR_REMAP GENMASK(11, 8) 134 #define DART_T8110_TCR_REMAP_EN BIT(7) 135 #define DART_T8110_TCR_BYPASS_DAPF BIT(2) 136 #define DART_T8110_TCR_BYPASS_DART BIT(1) 137 #define DART_T8110_TCR_TRANSLATE_ENABLE BIT(0) 138 139 #define DART_T8110_TTBR 0x1400 140 #define DART_T8110_TTBR_VALID BIT(0) 141 #define DART_T8110_TTBR_ADDR_FIELD_SHIFT 2 142 #define DART_T8110_TTBR_SHIFT 14 143 144 #define DART_TCR(dart, sid) ((dart)->hw->tcr + ((sid) << 2)) 145 146 #define DART_TTBR(dart, sid, idx) ((dart)->hw->ttbr + \ 147 (((dart)->hw->ttbr_count * (sid)) << 2) + \ 148 ((idx) << 2)) 149 150 struct apple_dart_stream_map; 151 152 enum dart_type { 153 DART_T8020, 154 DART_T6000, 155 DART_T8110, 156 }; 157 158 struct apple_dart_hw { 159 enum dart_type type; 160 irqreturn_t (*irq_handler)(int irq, void *dev); 161 int (*invalidate_tlb)(struct apple_dart_stream_map *stream_map); 162 163 u32 oas; 164 enum io_pgtable_fmt fmt; 165 166 int max_sid_count; 167 168 u64 lock; 169 u64 lock_bit; 170 171 u64 error; 172 173 u64 enable_streams; 174 175 u64 tcr; 176 u64 tcr_enabled; 177 u64 tcr_disabled; 178 u64 tcr_bypass; 179 180 u64 ttbr; 181 u64 ttbr_valid; 182 u64 ttbr_addr_field_shift; 183 u64 ttbr_shift; 184 int ttbr_count; 185 }; 186 187 /* 188 * Private structure associated with each DART device. 189 * 190 * @dev: device struct 191 * @hw: SoC-specific hardware data 192 * @regs: mapped MMIO region 193 * @irq: interrupt number, can be shared with other DARTs 194 * @clks: clocks associated with this DART 195 * @num_clks: number of @clks 196 * @lock: lock for hardware operations involving this dart 197 * @pgsize: pagesize supported by this DART 198 * @supports_bypass: indicates if this DART supports bypass mode 199 * @force_bypass: force bypass mode due to pagesize mismatch? 200 * @sid2group: maps stream ids to iommu_groups 201 * @iommu: iommu core device 202 */ 203 struct apple_dart { 204 struct device *dev; 205 const struct apple_dart_hw *hw; 206 207 void __iomem *regs; 208 209 int irq; 210 struct clk_bulk_data *clks; 211 int num_clks; 212 213 spinlock_t lock; 214 215 u32 ias; 216 u32 oas; 217 u32 pgsize; 218 u32 num_streams; 219 u32 supports_bypass : 1; 220 u32 force_bypass : 1; 221 222 struct iommu_group *sid2group[DART_MAX_STREAMS]; 223 struct iommu_device iommu; 224 225 u32 save_tcr[DART_MAX_STREAMS]; 226 u32 save_ttbr[DART_MAX_STREAMS][DART_MAX_TTBR]; 227 }; 228 229 /* 230 * Convenience struct to identify streams. 231 * 232 * The normal variant is used inside apple_dart_master_cfg which isn't written 233 * to concurrently. 234 * The atomic variant is used inside apple_dart_domain where we have to guard 235 * against races from potential parallel calls to attach/detach_device. 236 * Note that even inside the atomic variant the apple_dart pointer is not 237 * protected: This pointer is initialized once under the domain init mutex 238 * and never changed again afterwards. Devices with different dart pointers 239 * cannot be attached to the same domain. 240 * 241 * @dart dart pointer 242 * @sid stream id bitmap 243 */ 244 struct apple_dart_stream_map { 245 struct apple_dart *dart; 246 DECLARE_BITMAP(sidmap, DART_MAX_STREAMS); 247 }; 248 struct apple_dart_atomic_stream_map { 249 struct apple_dart *dart; 250 atomic_long_t sidmap[BITS_TO_LONGS(DART_MAX_STREAMS)]; 251 }; 252 253 /* 254 * This structure is attached to each iommu domain handled by a DART. 255 * 256 * @pgtbl_ops: pagetable ops allocated by io-pgtable 257 * @finalized: true if the domain has been completely initialized 258 * @init_lock: protects domain initialization 259 * @stream_maps: streams attached to this domain (valid for DMA/UNMANAGED only) 260 * @domain: core iommu domain pointer 261 */ 262 struct apple_dart_domain { 263 struct io_pgtable_ops *pgtbl_ops; 264 265 bool finalized; 266 struct mutex init_lock; 267 struct apple_dart_atomic_stream_map stream_maps[MAX_DARTS_PER_DEVICE]; 268 269 struct iommu_domain domain; 270 }; 271 272 /* 273 * This structure is attached to devices with dev_iommu_priv_set() on of_xlate 274 * and contains a list of streams bound to this device. 275 * So far the worst case seen is a single device with two streams 276 * from different darts, such that this simple static array is enough. 277 * 278 * @streams: streams for this device 279 */ 280 struct apple_dart_master_cfg { 281 struct apple_dart_stream_map stream_maps[MAX_DARTS_PER_DEVICE]; 282 }; 283 284 /* 285 * Helper macro to iterate over apple_dart_master_cfg.stream_maps and 286 * apple_dart_domain.stream_maps 287 * 288 * @i int used as loop variable 289 * @base pointer to base struct (apple_dart_master_cfg or apple_dart_domain) 290 * @stream pointer to the apple_dart_streams struct for each loop iteration 291 */ 292 #define for_each_stream_map(i, base, stream_map) \ 293 for (i = 0, stream_map = &(base)->stream_maps[0]; \ 294 i < MAX_DARTS_PER_DEVICE && stream_map->dart; \ 295 stream_map = &(base)->stream_maps[++i]) 296 297 static struct platform_driver apple_dart_driver; 298 static const struct iommu_ops apple_dart_iommu_ops; 299 300 static struct apple_dart_domain *to_dart_domain(struct iommu_domain *dom) 301 { 302 return container_of(dom, struct apple_dart_domain, domain); 303 } 304 305 static void 306 apple_dart_hw_enable_translation(struct apple_dart_stream_map *stream_map) 307 { 308 struct apple_dart *dart = stream_map->dart; 309 int sid; 310 311 for_each_set_bit(sid, stream_map->sidmap, dart->num_streams) 312 writel(dart->hw->tcr_enabled, dart->regs + DART_TCR(dart, sid)); 313 } 314 315 static void apple_dart_hw_disable_dma(struct apple_dart_stream_map *stream_map) 316 { 317 struct apple_dart *dart = stream_map->dart; 318 int sid; 319 320 for_each_set_bit(sid, stream_map->sidmap, dart->num_streams) 321 writel(dart->hw->tcr_disabled, dart->regs + DART_TCR(dart, sid)); 322 } 323 324 static void 325 apple_dart_hw_enable_bypass(struct apple_dart_stream_map *stream_map) 326 { 327 struct apple_dart *dart = stream_map->dart; 328 int sid; 329 330 WARN_ON(!stream_map->dart->supports_bypass); 331 for_each_set_bit(sid, stream_map->sidmap, dart->num_streams) 332 writel(dart->hw->tcr_bypass, 333 dart->regs + DART_TCR(dart, sid)); 334 } 335 336 static void apple_dart_hw_set_ttbr(struct apple_dart_stream_map *stream_map, 337 u8 idx, phys_addr_t paddr) 338 { 339 struct apple_dart *dart = stream_map->dart; 340 int sid; 341 342 WARN_ON(paddr & ((1 << dart->hw->ttbr_shift) - 1)); 343 for_each_set_bit(sid, stream_map->sidmap, dart->num_streams) 344 writel(dart->hw->ttbr_valid | 345 (paddr >> dart->hw->ttbr_shift) << dart->hw->ttbr_addr_field_shift, 346 dart->regs + DART_TTBR(dart, sid, idx)); 347 } 348 349 static void apple_dart_hw_clear_ttbr(struct apple_dart_stream_map *stream_map, 350 u8 idx) 351 { 352 struct apple_dart *dart = stream_map->dart; 353 int sid; 354 355 for_each_set_bit(sid, stream_map->sidmap, dart->num_streams) 356 writel(0, dart->regs + DART_TTBR(dart, sid, idx)); 357 } 358 359 static void 360 apple_dart_hw_clear_all_ttbrs(struct apple_dart_stream_map *stream_map) 361 { 362 int i; 363 364 for (i = 0; i < stream_map->dart->hw->ttbr_count; ++i) 365 apple_dart_hw_clear_ttbr(stream_map, i); 366 } 367 368 static int 369 apple_dart_t8020_hw_stream_command(struct apple_dart_stream_map *stream_map, 370 u32 command) 371 { 372 unsigned long flags; 373 int ret; 374 u32 command_reg; 375 376 spin_lock_irqsave(&stream_map->dart->lock, flags); 377 378 writel(stream_map->sidmap[0], stream_map->dart->regs + DART_T8020_STREAM_SELECT); 379 writel(command, stream_map->dart->regs + DART_T8020_STREAM_COMMAND); 380 381 ret = readl_poll_timeout_atomic( 382 stream_map->dart->regs + DART_T8020_STREAM_COMMAND, command_reg, 383 !(command_reg & DART_T8020_STREAM_COMMAND_BUSY), 1, 384 DART_STREAM_COMMAND_BUSY_TIMEOUT); 385 386 spin_unlock_irqrestore(&stream_map->dart->lock, flags); 387 388 if (ret) { 389 dev_err(stream_map->dart->dev, 390 "busy bit did not clear after command %x for streams %lx\n", 391 command, stream_map->sidmap[0]); 392 return ret; 393 } 394 395 return 0; 396 } 397 398 static int 399 apple_dart_t8110_hw_tlb_command(struct apple_dart_stream_map *stream_map, 400 u32 command) 401 { 402 struct apple_dart *dart = stream_map->dart; 403 unsigned long flags; 404 int ret = 0; 405 int sid; 406 407 spin_lock_irqsave(&dart->lock, flags); 408 409 for_each_set_bit(sid, stream_map->sidmap, dart->num_streams) { 410 u32 val = FIELD_PREP(DART_T8110_TLB_CMD_OP, command) | 411 FIELD_PREP(DART_T8110_TLB_CMD_STREAM, sid); 412 writel(val, dart->regs + DART_T8110_TLB_CMD); 413 414 ret = readl_poll_timeout_atomic( 415 dart->regs + DART_T8110_TLB_CMD, val, 416 !(val & DART_T8110_TLB_CMD_BUSY), 1, 417 DART_STREAM_COMMAND_BUSY_TIMEOUT); 418 419 if (ret) 420 break; 421 422 } 423 424 spin_unlock_irqrestore(&dart->lock, flags); 425 426 if (ret) { 427 dev_err(stream_map->dart->dev, 428 "busy bit did not clear after command %x for stream %d\n", 429 command, sid); 430 return ret; 431 } 432 433 return 0; 434 } 435 436 static int 437 apple_dart_t8020_hw_invalidate_tlb(struct apple_dart_stream_map *stream_map) 438 { 439 return apple_dart_t8020_hw_stream_command( 440 stream_map, DART_T8020_STREAM_COMMAND_INVALIDATE); 441 } 442 443 static int 444 apple_dart_t8110_hw_invalidate_tlb(struct apple_dart_stream_map *stream_map) 445 { 446 return apple_dart_t8110_hw_tlb_command( 447 stream_map, DART_T8110_TLB_CMD_OP_FLUSH_SID); 448 } 449 450 static int apple_dart_hw_reset(struct apple_dart *dart) 451 { 452 u32 config; 453 struct apple_dart_stream_map stream_map; 454 int i; 455 456 config = readl(dart->regs + dart->hw->lock); 457 if (config & dart->hw->lock_bit) { 458 dev_err(dart->dev, "DART is locked down until reboot: %08x\n", 459 config); 460 return -EINVAL; 461 } 462 463 stream_map.dart = dart; 464 bitmap_zero(stream_map.sidmap, DART_MAX_STREAMS); 465 bitmap_set(stream_map.sidmap, 0, dart->num_streams); 466 apple_dart_hw_disable_dma(&stream_map); 467 apple_dart_hw_clear_all_ttbrs(&stream_map); 468 469 /* enable all streams globally since TCR is used to control isolation */ 470 for (i = 0; i < BITS_TO_U32(dart->num_streams); i++) 471 writel(U32_MAX, dart->regs + dart->hw->enable_streams + 4 * i); 472 473 /* clear any pending errors before the interrupt is unmasked */ 474 writel(readl(dart->regs + dart->hw->error), dart->regs + dart->hw->error); 475 476 if (dart->hw->type == DART_T8110) 477 writel(0, dart->regs + DART_T8110_ERROR_MASK); 478 479 return dart->hw->invalidate_tlb(&stream_map); 480 } 481 482 static void apple_dart_domain_flush_tlb(struct apple_dart_domain *domain) 483 { 484 int i, j; 485 struct apple_dart_atomic_stream_map *domain_stream_map; 486 struct apple_dart_stream_map stream_map; 487 488 for_each_stream_map(i, domain, domain_stream_map) { 489 stream_map.dart = domain_stream_map->dart; 490 491 for (j = 0; j < BITS_TO_LONGS(stream_map.dart->num_streams); j++) 492 stream_map.sidmap[j] = atomic_long_read(&domain_stream_map->sidmap[j]); 493 494 stream_map.dart->hw->invalidate_tlb(&stream_map); 495 } 496 } 497 498 static void apple_dart_flush_iotlb_all(struct iommu_domain *domain) 499 { 500 apple_dart_domain_flush_tlb(to_dart_domain(domain)); 501 } 502 503 static void apple_dart_iotlb_sync(struct iommu_domain *domain, 504 struct iommu_iotlb_gather *gather) 505 { 506 apple_dart_domain_flush_tlb(to_dart_domain(domain)); 507 } 508 509 static void apple_dart_iotlb_sync_map(struct iommu_domain *domain, 510 unsigned long iova, size_t size) 511 { 512 apple_dart_domain_flush_tlb(to_dart_domain(domain)); 513 } 514 515 static phys_addr_t apple_dart_iova_to_phys(struct iommu_domain *domain, 516 dma_addr_t iova) 517 { 518 struct apple_dart_domain *dart_domain = to_dart_domain(domain); 519 struct io_pgtable_ops *ops = dart_domain->pgtbl_ops; 520 521 if (!ops) 522 return 0; 523 524 return ops->iova_to_phys(ops, iova); 525 } 526 527 static int apple_dart_map_pages(struct iommu_domain *domain, unsigned long iova, 528 phys_addr_t paddr, size_t pgsize, 529 size_t pgcount, int prot, gfp_t gfp, 530 size_t *mapped) 531 { 532 struct apple_dart_domain *dart_domain = to_dart_domain(domain); 533 struct io_pgtable_ops *ops = dart_domain->pgtbl_ops; 534 535 if (!ops) 536 return -ENODEV; 537 538 return ops->map_pages(ops, iova, paddr, pgsize, pgcount, prot, gfp, 539 mapped); 540 } 541 542 static size_t apple_dart_unmap_pages(struct iommu_domain *domain, 543 unsigned long iova, size_t pgsize, 544 size_t pgcount, 545 struct iommu_iotlb_gather *gather) 546 { 547 struct apple_dart_domain *dart_domain = to_dart_domain(domain); 548 struct io_pgtable_ops *ops = dart_domain->pgtbl_ops; 549 550 return ops->unmap_pages(ops, iova, pgsize, pgcount, gather); 551 } 552 553 static void 554 apple_dart_setup_translation(struct apple_dart_domain *domain, 555 struct apple_dart_stream_map *stream_map) 556 { 557 int i; 558 struct io_pgtable_cfg *pgtbl_cfg = 559 &io_pgtable_ops_to_pgtable(domain->pgtbl_ops)->cfg; 560 561 for (i = 0; i < pgtbl_cfg->apple_dart_cfg.n_ttbrs; ++i) 562 apple_dart_hw_set_ttbr(stream_map, i, 563 pgtbl_cfg->apple_dart_cfg.ttbr[i]); 564 for (; i < stream_map->dart->hw->ttbr_count; ++i) 565 apple_dart_hw_clear_ttbr(stream_map, i); 566 567 apple_dart_hw_enable_translation(stream_map); 568 stream_map->dart->hw->invalidate_tlb(stream_map); 569 } 570 571 static int apple_dart_finalize_domain(struct iommu_domain *domain, 572 struct apple_dart_master_cfg *cfg) 573 { 574 struct apple_dart_domain *dart_domain = to_dart_domain(domain); 575 struct apple_dart *dart = cfg->stream_maps[0].dart; 576 struct io_pgtable_cfg pgtbl_cfg; 577 int ret = 0; 578 int i, j; 579 580 mutex_lock(&dart_domain->init_lock); 581 582 if (dart_domain->finalized) 583 goto done; 584 585 for (i = 0; i < MAX_DARTS_PER_DEVICE; ++i) { 586 dart_domain->stream_maps[i].dart = cfg->stream_maps[i].dart; 587 for (j = 0; j < BITS_TO_LONGS(dart->num_streams); j++) 588 atomic_long_set(&dart_domain->stream_maps[i].sidmap[j], 589 cfg->stream_maps[i].sidmap[j]); 590 } 591 592 pgtbl_cfg = (struct io_pgtable_cfg){ 593 .pgsize_bitmap = dart->pgsize, 594 .ias = dart->ias, 595 .oas = dart->oas, 596 .coherent_walk = 1, 597 .iommu_dev = dart->dev, 598 }; 599 600 dart_domain->pgtbl_ops = 601 alloc_io_pgtable_ops(dart->hw->fmt, &pgtbl_cfg, domain); 602 if (!dart_domain->pgtbl_ops) { 603 ret = -ENOMEM; 604 goto done; 605 } 606 607 domain->pgsize_bitmap = pgtbl_cfg.pgsize_bitmap; 608 domain->geometry.aperture_start = 0; 609 domain->geometry.aperture_end = (dma_addr_t)DMA_BIT_MASK(dart->ias); 610 domain->geometry.force_aperture = true; 611 612 dart_domain->finalized = true; 613 614 done: 615 mutex_unlock(&dart_domain->init_lock); 616 return ret; 617 } 618 619 static int 620 apple_dart_mod_streams(struct apple_dart_atomic_stream_map *domain_maps, 621 struct apple_dart_stream_map *master_maps, 622 bool add_streams) 623 { 624 int i, j; 625 626 for (i = 0; i < MAX_DARTS_PER_DEVICE; ++i) { 627 if (domain_maps[i].dart != master_maps[i].dart) 628 return -EINVAL; 629 } 630 631 for (i = 0; i < MAX_DARTS_PER_DEVICE; ++i) { 632 if (!domain_maps[i].dart) 633 break; 634 for (j = 0; j < BITS_TO_LONGS(domain_maps[i].dart->num_streams); j++) { 635 if (add_streams) 636 atomic_long_or(master_maps[i].sidmap[j], 637 &domain_maps[i].sidmap[j]); 638 else 639 atomic_long_and(~master_maps[i].sidmap[j], 640 &domain_maps[i].sidmap[j]); 641 } 642 } 643 644 return 0; 645 } 646 647 static int apple_dart_domain_add_streams(struct apple_dart_domain *domain, 648 struct apple_dart_master_cfg *cfg) 649 { 650 return apple_dart_mod_streams(domain->stream_maps, cfg->stream_maps, 651 true); 652 } 653 654 static int apple_dart_attach_dev(struct iommu_domain *domain, 655 struct device *dev) 656 { 657 int ret, i; 658 struct apple_dart_stream_map *stream_map; 659 struct apple_dart_master_cfg *cfg = dev_iommu_priv_get(dev); 660 struct apple_dart_domain *dart_domain = to_dart_domain(domain); 661 662 if (cfg->stream_maps[0].dart->force_bypass && 663 domain->type != IOMMU_DOMAIN_IDENTITY) 664 return -EINVAL; 665 if (!cfg->stream_maps[0].dart->supports_bypass && 666 domain->type == IOMMU_DOMAIN_IDENTITY) 667 return -EINVAL; 668 669 ret = apple_dart_finalize_domain(domain, cfg); 670 if (ret) 671 return ret; 672 673 switch (domain->type) { 674 case IOMMU_DOMAIN_DMA: 675 case IOMMU_DOMAIN_UNMANAGED: 676 ret = apple_dart_domain_add_streams(dart_domain, cfg); 677 if (ret) 678 return ret; 679 680 for_each_stream_map(i, cfg, stream_map) 681 apple_dart_setup_translation(dart_domain, stream_map); 682 break; 683 case IOMMU_DOMAIN_BLOCKED: 684 for_each_stream_map(i, cfg, stream_map) 685 apple_dart_hw_disable_dma(stream_map); 686 break; 687 case IOMMU_DOMAIN_IDENTITY: 688 for_each_stream_map(i, cfg, stream_map) 689 apple_dart_hw_enable_bypass(stream_map); 690 break; 691 } 692 693 return ret; 694 } 695 696 static struct iommu_device *apple_dart_probe_device(struct device *dev) 697 { 698 struct apple_dart_master_cfg *cfg = dev_iommu_priv_get(dev); 699 struct apple_dart_stream_map *stream_map; 700 int i; 701 702 if (!cfg) 703 return ERR_PTR(-ENODEV); 704 705 for_each_stream_map(i, cfg, stream_map) 706 device_link_add( 707 dev, stream_map->dart->dev, 708 DL_FLAG_PM_RUNTIME | DL_FLAG_AUTOREMOVE_SUPPLIER); 709 710 return &cfg->stream_maps[0].dart->iommu; 711 } 712 713 static void apple_dart_release_device(struct device *dev) 714 { 715 struct apple_dart_master_cfg *cfg = dev_iommu_priv_get(dev); 716 717 dev_iommu_priv_set(dev, NULL); 718 kfree(cfg); 719 } 720 721 static struct iommu_domain *apple_dart_domain_alloc(unsigned int type) 722 { 723 struct apple_dart_domain *dart_domain; 724 725 if (type != IOMMU_DOMAIN_DMA && type != IOMMU_DOMAIN_UNMANAGED && 726 type != IOMMU_DOMAIN_IDENTITY && type != IOMMU_DOMAIN_BLOCKED) 727 return NULL; 728 729 dart_domain = kzalloc(sizeof(*dart_domain), GFP_KERNEL); 730 if (!dart_domain) 731 return NULL; 732 733 mutex_init(&dart_domain->init_lock); 734 735 /* no need to allocate pgtbl_ops or do any other finalization steps */ 736 if (type == IOMMU_DOMAIN_IDENTITY || type == IOMMU_DOMAIN_BLOCKED) 737 dart_domain->finalized = true; 738 739 return &dart_domain->domain; 740 } 741 742 static void apple_dart_domain_free(struct iommu_domain *domain) 743 { 744 struct apple_dart_domain *dart_domain = to_dart_domain(domain); 745 746 if (dart_domain->pgtbl_ops) 747 free_io_pgtable_ops(dart_domain->pgtbl_ops); 748 749 kfree(dart_domain); 750 } 751 752 static int apple_dart_of_xlate(struct device *dev, struct of_phandle_args *args) 753 { 754 struct apple_dart_master_cfg *cfg = dev_iommu_priv_get(dev); 755 struct platform_device *iommu_pdev = of_find_device_by_node(args->np); 756 struct apple_dart *dart = platform_get_drvdata(iommu_pdev); 757 struct apple_dart *cfg_dart; 758 int i, sid; 759 760 if (args->args_count != 1) 761 return -EINVAL; 762 sid = args->args[0]; 763 764 if (!cfg) 765 cfg = kzalloc(sizeof(*cfg), GFP_KERNEL); 766 if (!cfg) 767 return -ENOMEM; 768 dev_iommu_priv_set(dev, cfg); 769 770 cfg_dart = cfg->stream_maps[0].dart; 771 if (cfg_dart) { 772 if (cfg_dart->supports_bypass != dart->supports_bypass) 773 return -EINVAL; 774 if (cfg_dart->force_bypass != dart->force_bypass) 775 return -EINVAL; 776 if (cfg_dart->pgsize != dart->pgsize) 777 return -EINVAL; 778 } 779 780 for (i = 0; i < MAX_DARTS_PER_DEVICE; ++i) { 781 if (cfg->stream_maps[i].dart == dart) { 782 set_bit(sid, cfg->stream_maps[i].sidmap); 783 return 0; 784 } 785 } 786 for (i = 0; i < MAX_DARTS_PER_DEVICE; ++i) { 787 if (!cfg->stream_maps[i].dart) { 788 cfg->stream_maps[i].dart = dart; 789 set_bit(sid, cfg->stream_maps[i].sidmap); 790 return 0; 791 } 792 } 793 794 return -EINVAL; 795 } 796 797 static DEFINE_MUTEX(apple_dart_groups_lock); 798 799 static void apple_dart_release_group(void *iommu_data) 800 { 801 int i, sid; 802 struct apple_dart_stream_map *stream_map; 803 struct apple_dart_master_cfg *group_master_cfg = iommu_data; 804 805 mutex_lock(&apple_dart_groups_lock); 806 807 for_each_stream_map(i, group_master_cfg, stream_map) 808 for_each_set_bit(sid, stream_map->sidmap, stream_map->dart->num_streams) 809 stream_map->dart->sid2group[sid] = NULL; 810 811 kfree(iommu_data); 812 mutex_unlock(&apple_dart_groups_lock); 813 } 814 815 static int apple_dart_merge_master_cfg(struct apple_dart_master_cfg *dst, 816 struct apple_dart_master_cfg *src) 817 { 818 /* 819 * We know that this function is only called for groups returned from 820 * pci_device_group and that all Apple Silicon platforms never spread 821 * PCIe devices from the same bus across multiple DARTs such that we can 822 * just assume that both src and dst only have the same single DART. 823 */ 824 if (src->stream_maps[1].dart) 825 return -EINVAL; 826 if (dst->stream_maps[1].dart) 827 return -EINVAL; 828 if (src->stream_maps[0].dart != dst->stream_maps[0].dart) 829 return -EINVAL; 830 831 bitmap_or(dst->stream_maps[0].sidmap, 832 dst->stream_maps[0].sidmap, 833 src->stream_maps[0].sidmap, 834 dst->stream_maps[0].dart->num_streams); 835 return 0; 836 } 837 838 static struct iommu_group *apple_dart_device_group(struct device *dev) 839 { 840 int i, sid; 841 struct apple_dart_master_cfg *cfg = dev_iommu_priv_get(dev); 842 struct apple_dart_stream_map *stream_map; 843 struct apple_dart_master_cfg *group_master_cfg; 844 struct iommu_group *group = NULL; 845 struct iommu_group *res = ERR_PTR(-EINVAL); 846 847 mutex_lock(&apple_dart_groups_lock); 848 849 for_each_stream_map(i, cfg, stream_map) { 850 for_each_set_bit(sid, stream_map->sidmap, stream_map->dart->num_streams) { 851 struct iommu_group *stream_group = 852 stream_map->dart->sid2group[sid]; 853 854 if (group && group != stream_group) { 855 res = ERR_PTR(-EINVAL); 856 goto out; 857 } 858 859 group = stream_group; 860 } 861 } 862 863 if (group) { 864 res = iommu_group_ref_get(group); 865 goto out; 866 } 867 868 #ifdef CONFIG_PCI 869 if (dev_is_pci(dev)) 870 group = pci_device_group(dev); 871 else 872 #endif 873 group = generic_device_group(dev); 874 875 res = ERR_PTR(-ENOMEM); 876 if (!group) 877 goto out; 878 879 group_master_cfg = iommu_group_get_iommudata(group); 880 if (group_master_cfg) { 881 int ret; 882 883 ret = apple_dart_merge_master_cfg(group_master_cfg, cfg); 884 if (ret) { 885 dev_err(dev, "Failed to merge DART IOMMU grups.\n"); 886 iommu_group_put(group); 887 res = ERR_PTR(ret); 888 goto out; 889 } 890 } else { 891 group_master_cfg = kmemdup(cfg, sizeof(*group_master_cfg), 892 GFP_KERNEL); 893 if (!group_master_cfg) { 894 iommu_group_put(group); 895 goto out; 896 } 897 898 iommu_group_set_iommudata(group, group_master_cfg, 899 apple_dart_release_group); 900 } 901 902 for_each_stream_map(i, cfg, stream_map) 903 for_each_set_bit(sid, stream_map->sidmap, stream_map->dart->num_streams) 904 stream_map->dart->sid2group[sid] = group; 905 906 res = group; 907 908 out: 909 mutex_unlock(&apple_dart_groups_lock); 910 return res; 911 } 912 913 static int apple_dart_def_domain_type(struct device *dev) 914 { 915 struct apple_dart_master_cfg *cfg = dev_iommu_priv_get(dev); 916 917 if (cfg->stream_maps[0].dart->force_bypass) 918 return IOMMU_DOMAIN_IDENTITY; 919 if (!cfg->stream_maps[0].dart->supports_bypass) 920 return IOMMU_DOMAIN_DMA; 921 922 return 0; 923 } 924 925 #ifndef CONFIG_PCIE_APPLE_MSI_DOORBELL_ADDR 926 /* Keep things compiling when CONFIG_PCI_APPLE isn't selected */ 927 #define CONFIG_PCIE_APPLE_MSI_DOORBELL_ADDR 0 928 #endif 929 #define DOORBELL_ADDR (CONFIG_PCIE_APPLE_MSI_DOORBELL_ADDR & PAGE_MASK) 930 931 static void apple_dart_get_resv_regions(struct device *dev, 932 struct list_head *head) 933 { 934 if (IS_ENABLED(CONFIG_PCIE_APPLE) && dev_is_pci(dev)) { 935 struct iommu_resv_region *region; 936 int prot = IOMMU_WRITE | IOMMU_NOEXEC | IOMMU_MMIO; 937 938 region = iommu_alloc_resv_region(DOORBELL_ADDR, 939 PAGE_SIZE, prot, 940 IOMMU_RESV_MSI, GFP_KERNEL); 941 if (!region) 942 return; 943 944 list_add_tail(®ion->list, head); 945 } 946 947 iommu_dma_get_resv_regions(dev, head); 948 } 949 950 static const struct iommu_ops apple_dart_iommu_ops = { 951 .domain_alloc = apple_dart_domain_alloc, 952 .probe_device = apple_dart_probe_device, 953 .release_device = apple_dart_release_device, 954 .device_group = apple_dart_device_group, 955 .of_xlate = apple_dart_of_xlate, 956 .def_domain_type = apple_dart_def_domain_type, 957 .get_resv_regions = apple_dart_get_resv_regions, 958 .pgsize_bitmap = -1UL, /* Restricted during dart probe */ 959 .owner = THIS_MODULE, 960 .default_domain_ops = &(const struct iommu_domain_ops) { 961 .attach_dev = apple_dart_attach_dev, 962 .map_pages = apple_dart_map_pages, 963 .unmap_pages = apple_dart_unmap_pages, 964 .flush_iotlb_all = apple_dart_flush_iotlb_all, 965 .iotlb_sync = apple_dart_iotlb_sync, 966 .iotlb_sync_map = apple_dart_iotlb_sync_map, 967 .iova_to_phys = apple_dart_iova_to_phys, 968 .free = apple_dart_domain_free, 969 } 970 }; 971 972 static irqreturn_t apple_dart_t8020_irq(int irq, void *dev) 973 { 974 struct apple_dart *dart = dev; 975 const char *fault_name = NULL; 976 u32 error = readl(dart->regs + DART_T8020_ERROR); 977 u32 error_code = FIELD_GET(DART_T8020_ERROR_CODE, error); 978 u32 addr_lo = readl(dart->regs + DART_T8020_ERROR_ADDR_LO); 979 u32 addr_hi = readl(dart->regs + DART_T8020_ERROR_ADDR_HI); 980 u64 addr = addr_lo | (((u64)addr_hi) << 32); 981 u8 stream_idx = FIELD_GET(DART_T8020_ERROR_STREAM, error); 982 983 if (!(error & DART_T8020_ERROR_FLAG)) 984 return IRQ_NONE; 985 986 /* there should only be a single bit set but let's use == to be sure */ 987 if (error_code == DART_T8020_ERROR_READ_FAULT) 988 fault_name = "READ FAULT"; 989 else if (error_code == DART_T8020_ERROR_WRITE_FAULT) 990 fault_name = "WRITE FAULT"; 991 else if (error_code == DART_T8020_ERROR_NO_PTE) 992 fault_name = "NO PTE FOR IOVA"; 993 else if (error_code == DART_T8020_ERROR_NO_PMD) 994 fault_name = "NO PMD FOR IOVA"; 995 else if (error_code == DART_T8020_ERROR_NO_TTBR) 996 fault_name = "NO TTBR FOR IOVA"; 997 else 998 fault_name = "unknown"; 999 1000 dev_err_ratelimited( 1001 dart->dev, 1002 "translation fault: status:0x%x stream:%d code:0x%x (%s) at 0x%llx", 1003 error, stream_idx, error_code, fault_name, addr); 1004 1005 writel(error, dart->regs + DART_T8020_ERROR); 1006 return IRQ_HANDLED; 1007 } 1008 1009 static irqreturn_t apple_dart_t8110_irq(int irq, void *dev) 1010 { 1011 struct apple_dart *dart = dev; 1012 const char *fault_name = NULL; 1013 u32 error = readl(dart->regs + DART_T8110_ERROR); 1014 u32 error_code = FIELD_GET(DART_T8110_ERROR_CODE, error); 1015 u32 addr_lo = readl(dart->regs + DART_T8110_ERROR_ADDR_LO); 1016 u32 addr_hi = readl(dart->regs + DART_T8110_ERROR_ADDR_HI); 1017 u64 addr = addr_lo | (((u64)addr_hi) << 32); 1018 u8 stream_idx = FIELD_GET(DART_T8110_ERROR_STREAM, error); 1019 1020 if (!(error & DART_T8110_ERROR_FLAG)) 1021 return IRQ_NONE; 1022 1023 /* there should only be a single bit set but let's use == to be sure */ 1024 if (error_code == DART_T8110_ERROR_READ_FAULT) 1025 fault_name = "READ FAULT"; 1026 else if (error_code == DART_T8110_ERROR_WRITE_FAULT) 1027 fault_name = "WRITE FAULT"; 1028 else if (error_code == DART_T8110_ERROR_NO_PTE) 1029 fault_name = "NO PTE FOR IOVA"; 1030 else if (error_code == DART_T8110_ERROR_NO_PMD) 1031 fault_name = "NO PMD FOR IOVA"; 1032 else if (error_code == DART_T8110_ERROR_NO_PGD) 1033 fault_name = "NO PGD FOR IOVA"; 1034 else if (error_code == DART_T8110_ERROR_NO_TTBR) 1035 fault_name = "NO TTBR FOR IOVA"; 1036 else 1037 fault_name = "unknown"; 1038 1039 dev_err_ratelimited( 1040 dart->dev, 1041 "translation fault: status:0x%x stream:%d code:0x%x (%s) at 0x%llx", 1042 error, stream_idx, error_code, fault_name, addr); 1043 1044 writel(error, dart->regs + DART_T8110_ERROR); 1045 return IRQ_HANDLED; 1046 } 1047 1048 static int apple_dart_probe(struct platform_device *pdev) 1049 { 1050 int ret; 1051 u32 dart_params[4]; 1052 struct resource *res; 1053 struct apple_dart *dart; 1054 struct device *dev = &pdev->dev; 1055 1056 dart = devm_kzalloc(dev, sizeof(*dart), GFP_KERNEL); 1057 if (!dart) 1058 return -ENOMEM; 1059 1060 dart->dev = dev; 1061 dart->hw = of_device_get_match_data(dev); 1062 spin_lock_init(&dart->lock); 1063 1064 dart->regs = devm_platform_get_and_ioremap_resource(pdev, 0, &res); 1065 if (IS_ERR(dart->regs)) 1066 return PTR_ERR(dart->regs); 1067 1068 if (resource_size(res) < 0x4000) { 1069 dev_err(dev, "MMIO region too small (%pr)\n", res); 1070 return -EINVAL; 1071 } 1072 1073 dart->irq = platform_get_irq(pdev, 0); 1074 if (dart->irq < 0) 1075 return -ENODEV; 1076 1077 ret = devm_clk_bulk_get_all(dev, &dart->clks); 1078 if (ret < 0) 1079 return ret; 1080 dart->num_clks = ret; 1081 1082 ret = clk_bulk_prepare_enable(dart->num_clks, dart->clks); 1083 if (ret) 1084 return ret; 1085 1086 dart_params[0] = readl(dart->regs + DART_PARAMS1); 1087 dart_params[1] = readl(dart->regs + DART_PARAMS2); 1088 dart->pgsize = 1 << FIELD_GET(DART_PARAMS1_PAGE_SHIFT, dart_params[0]); 1089 dart->supports_bypass = dart_params[1] & DART_PARAMS2_BYPASS_SUPPORT; 1090 1091 switch (dart->hw->type) { 1092 case DART_T8020: 1093 case DART_T6000: 1094 dart->ias = 32; 1095 dart->oas = dart->hw->oas; 1096 dart->num_streams = dart->hw->max_sid_count; 1097 break; 1098 1099 case DART_T8110: 1100 dart_params[2] = readl(dart->regs + DART_T8110_PARAMS3); 1101 dart_params[3] = readl(dart->regs + DART_T8110_PARAMS4); 1102 dart->ias = FIELD_GET(DART_T8110_PARAMS3_VA_WIDTH, dart_params[2]); 1103 dart->oas = FIELD_GET(DART_T8110_PARAMS3_PA_WIDTH, dart_params[2]); 1104 dart->num_streams = FIELD_GET(DART_T8110_PARAMS4_NUM_SIDS, dart_params[3]); 1105 break; 1106 } 1107 1108 if (dart->num_streams > DART_MAX_STREAMS) { 1109 dev_err(&pdev->dev, "Too many streams (%d > %d)\n", 1110 dart->num_streams, DART_MAX_STREAMS); 1111 ret = -EINVAL; 1112 goto err_clk_disable; 1113 } 1114 1115 dart->force_bypass = dart->pgsize > PAGE_SIZE; 1116 1117 ret = apple_dart_hw_reset(dart); 1118 if (ret) 1119 goto err_clk_disable; 1120 1121 ret = request_irq(dart->irq, dart->hw->irq_handler, IRQF_SHARED, 1122 "apple-dart fault handler", dart); 1123 if (ret) 1124 goto err_clk_disable; 1125 1126 platform_set_drvdata(pdev, dart); 1127 1128 ret = iommu_device_sysfs_add(&dart->iommu, dev, NULL, "apple-dart.%s", 1129 dev_name(&pdev->dev)); 1130 if (ret) 1131 goto err_free_irq; 1132 1133 ret = iommu_device_register(&dart->iommu, &apple_dart_iommu_ops, dev); 1134 if (ret) 1135 goto err_sysfs_remove; 1136 1137 dev_info( 1138 &pdev->dev, 1139 "DART [pagesize %x, %d streams, bypass support: %d, bypass forced: %d] initialized\n", 1140 dart->pgsize, dart->num_streams, dart->supports_bypass, dart->force_bypass); 1141 return 0; 1142 1143 err_sysfs_remove: 1144 iommu_device_sysfs_remove(&dart->iommu); 1145 err_free_irq: 1146 free_irq(dart->irq, dart); 1147 err_clk_disable: 1148 clk_bulk_disable_unprepare(dart->num_clks, dart->clks); 1149 1150 return ret; 1151 } 1152 1153 static void apple_dart_remove(struct platform_device *pdev) 1154 { 1155 struct apple_dart *dart = platform_get_drvdata(pdev); 1156 1157 apple_dart_hw_reset(dart); 1158 free_irq(dart->irq, dart); 1159 1160 iommu_device_unregister(&dart->iommu); 1161 iommu_device_sysfs_remove(&dart->iommu); 1162 1163 clk_bulk_disable_unprepare(dart->num_clks, dart->clks); 1164 } 1165 1166 static const struct apple_dart_hw apple_dart_hw_t8103 = { 1167 .type = DART_T8020, 1168 .irq_handler = apple_dart_t8020_irq, 1169 .invalidate_tlb = apple_dart_t8020_hw_invalidate_tlb, 1170 .oas = 36, 1171 .fmt = APPLE_DART, 1172 .max_sid_count = 16, 1173 1174 .enable_streams = DART_T8020_STREAMS_ENABLE, 1175 .lock = DART_T8020_CONFIG, 1176 .lock_bit = DART_T8020_CONFIG_LOCK, 1177 1178 .error = DART_T8020_ERROR, 1179 1180 .tcr = DART_T8020_TCR, 1181 .tcr_enabled = DART_T8020_TCR_TRANSLATE_ENABLE, 1182 .tcr_disabled = 0, 1183 .tcr_bypass = DART_T8020_TCR_BYPASS_DAPF | DART_T8020_TCR_BYPASS_DART, 1184 1185 .ttbr = DART_T8020_TTBR, 1186 .ttbr_valid = DART_T8020_TTBR_VALID, 1187 .ttbr_addr_field_shift = DART_T8020_TTBR_ADDR_FIELD_SHIFT, 1188 .ttbr_shift = DART_T8020_TTBR_SHIFT, 1189 .ttbr_count = 4, 1190 }; 1191 static const struct apple_dart_hw apple_dart_hw_t6000 = { 1192 .type = DART_T6000, 1193 .irq_handler = apple_dart_t8020_irq, 1194 .invalidate_tlb = apple_dart_t8020_hw_invalidate_tlb, 1195 .oas = 42, 1196 .fmt = APPLE_DART2, 1197 .max_sid_count = 16, 1198 1199 .enable_streams = DART_T8020_STREAMS_ENABLE, 1200 .lock = DART_T8020_CONFIG, 1201 .lock_bit = DART_T8020_CONFIG_LOCK, 1202 1203 .error = DART_T8020_ERROR, 1204 1205 .tcr = DART_T8020_TCR, 1206 .tcr_enabled = DART_T8020_TCR_TRANSLATE_ENABLE, 1207 .tcr_disabled = 0, 1208 .tcr_bypass = DART_T8020_TCR_BYPASS_DAPF | DART_T8020_TCR_BYPASS_DART, 1209 1210 .ttbr = DART_T8020_TTBR, 1211 .ttbr_valid = DART_T8020_TTBR_VALID, 1212 .ttbr_addr_field_shift = DART_T8020_TTBR_ADDR_FIELD_SHIFT, 1213 .ttbr_shift = DART_T8020_TTBR_SHIFT, 1214 .ttbr_count = 4, 1215 }; 1216 1217 static const struct apple_dart_hw apple_dart_hw_t8110 = { 1218 .type = DART_T8110, 1219 .irq_handler = apple_dart_t8110_irq, 1220 .invalidate_tlb = apple_dart_t8110_hw_invalidate_tlb, 1221 .fmt = APPLE_DART2, 1222 .max_sid_count = 256, 1223 1224 .enable_streams = DART_T8110_ENABLE_STREAMS, 1225 .lock = DART_T8110_PROTECT, 1226 .lock_bit = DART_T8110_PROTECT_TTBR_TCR, 1227 1228 .error = DART_T8110_ERROR, 1229 1230 .tcr = DART_T8110_TCR, 1231 .tcr_enabled = DART_T8110_TCR_TRANSLATE_ENABLE, 1232 .tcr_disabled = 0, 1233 .tcr_bypass = DART_T8110_TCR_BYPASS_DAPF | DART_T8110_TCR_BYPASS_DART, 1234 1235 .ttbr = DART_T8110_TTBR, 1236 .ttbr_valid = DART_T8110_TTBR_VALID, 1237 .ttbr_addr_field_shift = DART_T8110_TTBR_ADDR_FIELD_SHIFT, 1238 .ttbr_shift = DART_T8110_TTBR_SHIFT, 1239 .ttbr_count = 1, 1240 }; 1241 1242 static __maybe_unused int apple_dart_suspend(struct device *dev) 1243 { 1244 struct apple_dart *dart = dev_get_drvdata(dev); 1245 unsigned int sid, idx; 1246 1247 for (sid = 0; sid < dart->num_streams; sid++) { 1248 dart->save_tcr[sid] = readl_relaxed(dart->regs + DART_TCR(dart, sid)); 1249 for (idx = 0; idx < dart->hw->ttbr_count; idx++) 1250 dart->save_ttbr[sid][idx] = 1251 readl(dart->regs + DART_TTBR(dart, sid, idx)); 1252 } 1253 1254 return 0; 1255 } 1256 1257 static __maybe_unused int apple_dart_resume(struct device *dev) 1258 { 1259 struct apple_dart *dart = dev_get_drvdata(dev); 1260 unsigned int sid, idx; 1261 int ret; 1262 1263 ret = apple_dart_hw_reset(dart); 1264 if (ret) { 1265 dev_err(dev, "Failed to reset DART on resume\n"); 1266 return ret; 1267 } 1268 1269 for (sid = 0; sid < dart->num_streams; sid++) { 1270 for (idx = 0; idx < dart->hw->ttbr_count; idx++) 1271 writel(dart->save_ttbr[sid][idx], 1272 dart->regs + DART_TTBR(dart, sid, idx)); 1273 writel(dart->save_tcr[sid], dart->regs + DART_TCR(dart, sid)); 1274 } 1275 1276 return 0; 1277 } 1278 1279 DEFINE_SIMPLE_DEV_PM_OPS(apple_dart_pm_ops, apple_dart_suspend, apple_dart_resume); 1280 1281 static const struct of_device_id apple_dart_of_match[] = { 1282 { .compatible = "apple,t8103-dart", .data = &apple_dart_hw_t8103 }, 1283 { .compatible = "apple,t8110-dart", .data = &apple_dart_hw_t8110 }, 1284 { .compatible = "apple,t6000-dart", .data = &apple_dart_hw_t6000 }, 1285 {}, 1286 }; 1287 MODULE_DEVICE_TABLE(of, apple_dart_of_match); 1288 1289 static struct platform_driver apple_dart_driver = { 1290 .driver = { 1291 .name = "apple-dart", 1292 .of_match_table = apple_dart_of_match, 1293 .suppress_bind_attrs = true, 1294 .pm = pm_sleep_ptr(&apple_dart_pm_ops), 1295 }, 1296 .probe = apple_dart_probe, 1297 .remove_new = apple_dart_remove, 1298 }; 1299 1300 module_platform_driver(apple_dart_driver); 1301 1302 MODULE_DESCRIPTION("IOMMU API for Apple's DART"); 1303 MODULE_AUTHOR("Sven Peter <sven@svenpeter.dev>"); 1304 MODULE_LICENSE("GPL v2"); 1305