drivers/iommu/apple-dart.c

   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(&region->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 int 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         return 0;
1166 }
1167
1168 static const struct apple_dart_hw apple_dart_hw_t8103 = {
1169         .type = DART_T8020,
1170         .irq_handler = apple_dart_t8020_irq,
1171         .invalidate_tlb = apple_dart_t8020_hw_invalidate_tlb,
1172         .oas = 36,
1173         .fmt = APPLE_DART,
1174         .max_sid_count = 16,
1175
1176         .enable_streams = DART_T8020_STREAMS_ENABLE,
1177         .lock = DART_T8020_CONFIG,
1178         .lock_bit = DART_T8020_CONFIG_LOCK,
1179
1180         .error = DART_T8020_ERROR,
1181
1182         .tcr = DART_T8020_TCR,
1183         .tcr_enabled = DART_T8020_TCR_TRANSLATE_ENABLE,
1184         .tcr_disabled = 0,
1185         .tcr_bypass = DART_T8020_TCR_BYPASS_DAPF | DART_T8020_TCR_BYPASS_DART,
1186
1187         .ttbr = DART_T8020_TTBR,
1188         .ttbr_valid = DART_T8020_TTBR_VALID,
1189         .ttbr_addr_field_shift = DART_T8020_TTBR_ADDR_FIELD_SHIFT,
1190         .ttbr_shift = DART_T8020_TTBR_SHIFT,
1191         .ttbr_count = 4,
1192 };
1193 static const struct apple_dart_hw apple_dart_hw_t6000 = {
1194         .type = DART_T6000,
1195         .irq_handler = apple_dart_t8020_irq,
1196         .invalidate_tlb = apple_dart_t8020_hw_invalidate_tlb,
1197         .oas = 42,
1198         .fmt = APPLE_DART2,
1199         .max_sid_count = 16,
1200
1201         .enable_streams = DART_T8020_STREAMS_ENABLE,
1202         .lock = DART_T8020_CONFIG,
1203         .lock_bit = DART_T8020_CONFIG_LOCK,
1204
1205         .error = DART_T8020_ERROR,
1206
1207         .tcr = DART_T8020_TCR,
1208         .tcr_enabled = DART_T8020_TCR_TRANSLATE_ENABLE,
1209         .tcr_disabled = 0,
1210         .tcr_bypass = DART_T8020_TCR_BYPASS_DAPF | DART_T8020_TCR_BYPASS_DART,
1211
1212         .ttbr = DART_T8020_TTBR,
1213         .ttbr_valid = DART_T8020_TTBR_VALID,
1214         .ttbr_addr_field_shift = DART_T8020_TTBR_ADDR_FIELD_SHIFT,
1215         .ttbr_shift = DART_T8020_TTBR_SHIFT,
1216         .ttbr_count = 4,
1217 };
1218
1219 static const struct apple_dart_hw apple_dart_hw_t8110 = {
1220         .type = DART_T8110,
1221         .irq_handler = apple_dart_t8110_irq,
1222         .invalidate_tlb = apple_dart_t8110_hw_invalidate_tlb,
1223         .fmt = APPLE_DART2,
1224         .max_sid_count = 256,
1225
1226         .enable_streams = DART_T8110_ENABLE_STREAMS,
1227         .lock = DART_T8110_PROTECT,
1228         .lock_bit = DART_T8110_PROTECT_TTBR_TCR,
1229
1230         .error = DART_T8110_ERROR,
1231
1232         .tcr = DART_T8110_TCR,
1233         .tcr_enabled = DART_T8110_TCR_TRANSLATE_ENABLE,
1234         .tcr_disabled = 0,
1235         .tcr_bypass = DART_T8110_TCR_BYPASS_DAPF | DART_T8110_TCR_BYPASS_DART,
1236
1237         .ttbr = DART_T8110_TTBR,
1238         .ttbr_valid = DART_T8110_TTBR_VALID,
1239         .ttbr_addr_field_shift = DART_T8110_TTBR_ADDR_FIELD_SHIFT,
1240         .ttbr_shift = DART_T8110_TTBR_SHIFT,
1241         .ttbr_count = 1,
1242 };
1243
1244 static __maybe_unused int apple_dart_suspend(struct device *dev)
1245 {
1246         struct apple_dart *dart = dev_get_drvdata(dev);
1247         unsigned int sid, idx;
1248
1249         for (sid = 0; sid < dart->num_streams; sid++) {
1250                 dart->save_tcr[sid] = readl_relaxed(dart->regs + DART_TCR(dart, sid));
1251                 for (idx = 0; idx < dart->hw->ttbr_count; idx++)
1252                         dart->save_ttbr[sid][idx] =
1253                                 readl(dart->regs + DART_TTBR(dart, sid, idx));
1254         }
1255
1256         return 0;
1257 }
1258
1259 static __maybe_unused int apple_dart_resume(struct device *dev)
1260 {
1261         struct apple_dart *dart = dev_get_drvdata(dev);
1262         unsigned int sid, idx;
1263         int ret;
1264
1265         ret = apple_dart_hw_reset(dart);
1266         if (ret) {
1267                 dev_err(dev, "Failed to reset DART on resume\n");
1268                 return ret;
1269         }
1270
1271         for (sid = 0; sid < dart->num_streams; sid++) {
1272                 for (idx = 0; idx < dart->hw->ttbr_count; idx++)
1273                         writel(dart->save_ttbr[sid][idx],
1274                                dart->regs + DART_TTBR(dart, sid, idx));
1275                 writel(dart->save_tcr[sid], dart->regs + DART_TCR(dart, sid));
1276         }
1277
1278         return 0;
1279 }
1280
1281 DEFINE_SIMPLE_DEV_PM_OPS(apple_dart_pm_ops, apple_dart_suspend, apple_dart_resume);
1282
1283 static const struct of_device_id apple_dart_of_match[] = {
1284         { .compatible = "apple,t8103-dart", .data = &apple_dart_hw_t8103 },
1285         { .compatible = "apple,t8110-dart", .data = &apple_dart_hw_t8110 },
1286         { .compatible = "apple,t6000-dart", .data = &apple_dart_hw_t6000 },
1287         {},
1288 };
1289 MODULE_DEVICE_TABLE(of, apple_dart_of_match);
1290
1291 static struct platform_driver apple_dart_driver = {
1292         .driver = {
1293                 .name                   = "apple-dart",
1294                 .of_match_table         = apple_dart_of_match,
1295                 .suppress_bind_attrs    = true,
1296                 .pm                     = pm_sleep_ptr(&apple_dart_pm_ops),
1297         },
1298         .probe  = apple_dart_probe,
1299         .remove = apple_dart_remove,
1300 };
1301
1302 module_platform_driver(apple_dart_driver);
1303
1304 MODULE_DESCRIPTION("IOMMU API for Apple's DART");
1305 MODULE_AUTHOR("Sven Peter <sven@svenpeter.dev>");
1306 MODULE_LICENSE("GPL v2");