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_USB4_TTBR  0x400
  85 #define DART_T8020_TTBR_VALID BIT(31)
  86 #define DART_T8020_TTBR_ADDR_FIELD_SHIFT 0
  87 #define DART_T8020_TTBR_SHIFT 12
  88
  89 /* T8110 registers */
  90
  91 #define DART_T8110_PARAMS3 0x08
  92 #define DART_T8110_PARAMS3_PA_WIDTH GENMASK(29, 24)
  93 #define DART_T8110_PARAMS3_VA_WIDTH GENMASK(21, 16)
  94 #define DART_T8110_PARAMS3_VER_MAJ GENMASK(15, 8)
  95 #define DART_T8110_PARAMS3_VER_MIN GENMASK(7, 0)
  96
  97 #define DART_T8110_PARAMS4 0x0c
  98 #define DART_T8110_PARAMS4_NUM_CLIENTS GENMASK(24, 16)
  99 #define DART_T8110_PARAMS4_NUM_SIDS GENMASK(8, 0)
 100
 101 #define DART_T8110_TLB_CMD              0x80
 102 #define DART_T8110_TLB_CMD_BUSY         BIT(31)
 103 #define DART_T8110_TLB_CMD_OP           GENMASK(10, 8)
 104 #define DART_T8110_TLB_CMD_OP_FLUSH_ALL 0
 105 #define DART_T8110_TLB_CMD_OP_FLUSH_SID 1
 106 #define DART_T8110_TLB_CMD_STREAM       GENMASK(7, 0)
 107
 108 #define DART_T8110_ERROR 0x100
 109 #define DART_T8110_ERROR_STREAM GENMASK(27, 20)
 110 #define DART_T8110_ERROR_CODE GENMASK(14, 0)
 111 #define DART_T8110_ERROR_FLAG BIT(31)
 112
 113 #define DART_T8110_ERROR_MASK 0x104
 114
 115 #define DART_T8110_ERROR_READ_FAULT BIT(5)
 116 #define DART_T8110_ERROR_WRITE_FAULT BIT(4)
 117 #define DART_T8110_ERROR_NO_PTE BIT(3)
 118 #define DART_T8110_ERROR_NO_PMD BIT(2)
 119 #define DART_T8110_ERROR_NO_PGD BIT(1)
 120 #define DART_T8110_ERROR_NO_TTBR BIT(0)
 121
 122 #define DART_T8110_ERROR_ADDR_LO 0x170
 123 #define DART_T8110_ERROR_ADDR_HI 0x174
 124
 125 #define DART_T8110_PROTECT 0x200
 126 #define DART_T8110_UNPROTECT 0x204
 127 #define DART_T8110_PROTECT_LOCK 0x208
 128 #define DART_T8110_PROTECT_TTBR_TCR BIT(0)
 129
 130 #define DART_T8110_ENABLE_STREAMS  0xc00
 131 #define DART_T8110_DISABLE_STREAMS 0xc20
 132
 133 #define DART_T8110_TCR                  0x1000
 134 #define DART_T8110_TCR_REMAP            GENMASK(11, 8)
 135 #define DART_T8110_TCR_REMAP_EN         BIT(7)
 136 #define DART_T8110_TCR_BYPASS_DAPF      BIT(2)
 137 #define DART_T8110_TCR_BYPASS_DART      BIT(1)
 138 #define DART_T8110_TCR_TRANSLATE_ENABLE BIT(0)
 139
 140 #define DART_T8110_TTBR       0x1400
 141 #define DART_T8110_TTBR_VALID BIT(0)
 142 #define DART_T8110_TTBR_ADDR_FIELD_SHIFT 2
 143 #define DART_T8110_TTBR_SHIFT 14
 144
 145 #define DART_TCR(dart, sid) ((dart)->hw->tcr + ((sid) << 2))
 146
 147 #define DART_TTBR(dart, sid, idx) ((dart)->hw->ttbr + \
 148                                    (((dart)->hw->ttbr_count * (sid)) << 2) + \
 149                                    ((idx) << 2))
 150
 151 struct apple_dart_stream_map;
 152
 153 enum dart_type {
 154         DART_T8020,
 155         DART_T6000,
 156         DART_T8110,
 157 };
 158
 159 struct apple_dart_hw {
 160         enum dart_type type;
 161         irqreturn_t (*irq_handler)(int irq, void *dev);
 162         int (*invalidate_tlb)(struct apple_dart_stream_map *stream_map);
 163
 164         u32 oas;
 165         enum io_pgtable_fmt fmt;
 166
 167         int max_sid_count;
 168
 169         u64 lock;
 170         u64 lock_bit;
 171
 172         u64 error;
 173
 174         u64 enable_streams;
 175
 176         u64 tcr;
 177         u64 tcr_enabled;
 178         u64 tcr_disabled;
 179         u64 tcr_bypass;
 180
 181         u64 ttbr;
 182         u64 ttbr_valid;
 183         u64 ttbr_addr_field_shift;
 184         u64 ttbr_shift;
 185         int ttbr_count;
 186 };
 187
 188 /*
 189  * Private structure associated with each DART device.
 190  *
 191  * @dev: device struct
 192  * @hw: SoC-specific hardware data
 193  * @regs: mapped MMIO region
 194  * @irq: interrupt number, can be shared with other DARTs
 195  * @clks: clocks associated with this DART
 196  * @num_clks: number of @clks
 197  * @lock: lock for hardware operations involving this dart
 198  * @pgsize: pagesize supported by this DART
 199  * @supports_bypass: indicates if this DART supports bypass mode
 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
 221         struct iommu_group *sid2group[DART_MAX_STREAMS];
 222         struct iommu_device iommu;
 223
 224         u32 save_tcr[DART_MAX_STREAMS];
 225         u32 save_ttbr[DART_MAX_STREAMS][DART_MAX_TTBR];
 226 };
 227
 228 /*
 229  * Convenience struct to identify streams.
 230  *
 231  * The normal variant is used inside apple_dart_master_cfg which isn't written
 232  * to concurrently.
 233  * The atomic variant is used inside apple_dart_domain where we have to guard
 234  * against races from potential parallel calls to attach/detach_device.
 235  * Note that even inside the atomic variant the apple_dart pointer is not
 236  * protected: This pointer is initialized once under the domain init mutex
 237  * and never changed again afterwards. Devices with different dart pointers
 238  * cannot be attached to the same domain.
 239  *
 240  * @dart dart pointer
 241  * @sid stream id bitmap
 242  */
 243 struct apple_dart_stream_map {
 244         struct apple_dart *dart;
 245         DECLARE_BITMAP(sidmap, DART_MAX_STREAMS);
 246 };
 247 struct apple_dart_atomic_stream_map {
 248         struct apple_dart *dart;
 249         atomic_long_t sidmap[BITS_TO_LONGS(DART_MAX_STREAMS)];
 250 };
 251
 252 /*
 253  * This structure is attached to each iommu domain handled by a DART.
 254  *
 255  * @pgtbl_ops: pagetable ops allocated by io-pgtable
 256  * @finalized: true if the domain has been completely initialized
 257  * @init_lock: protects domain initialization
 258  * @stream_maps: streams attached to this domain (valid for DMA/UNMANAGED only)
 259  * @domain: core iommu domain pointer
 260  */
 261 struct apple_dart_domain {
 262         struct io_pgtable_ops *pgtbl_ops;
 263
 264         bool finalized;
 265         struct mutex init_lock;
 266         struct apple_dart_atomic_stream_map stream_maps[MAX_DARTS_PER_DEVICE];
 267
 268         struct iommu_domain domain;
 269 };
 270
 271 /*
 272  * This structure is attached to devices with dev_iommu_priv_set() on of_xlate
 273  * and contains a list of streams bound to this device.
 274  * So far the worst case seen is a single device with two streams
 275  * from different darts, such that this simple static array is enough.
 276  *
 277  * @streams: streams for this device
 278  */
 279 struct apple_dart_master_cfg {
 280         struct apple_dart_stream_map stream_maps[MAX_DARTS_PER_DEVICE];
 281 };
 282
 283 /*
 284  * Helper macro to iterate over apple_dart_master_cfg.stream_maps and
 285  * apple_dart_domain.stream_maps
 286  *
 287  * @i int used as loop variable
 288  * @base pointer to base struct (apple_dart_master_cfg or apple_dart_domain)
 289  * @stream pointer to the apple_dart_streams struct for each loop iteration
 290  */
 291 #define for_each_stream_map(i, base, stream_map)                               \
 292         for (i = 0, stream_map = &(base)->stream_maps[0];                      \
 293              i < MAX_DARTS_PER_DEVICE && stream_map->dart;                     \
 294              stream_map = &(base)->stream_maps[++i])
 295
 296 static struct platform_driver apple_dart_driver;
 297 static const struct iommu_ops apple_dart_iommu_ops;
 298
 299 static struct apple_dart_domain *to_dart_domain(struct iommu_domain *dom)
 300 {
 301         return container_of(dom, struct apple_dart_domain, domain);
 302 }
 303
 304 static void
 305 apple_dart_hw_enable_translation(struct apple_dart_stream_map *stream_map)
 306 {
 307         struct apple_dart *dart = stream_map->dart;
 308         int sid;
 309
 310         for_each_set_bit(sid, stream_map->sidmap, dart->num_streams)
 311                 writel(dart->hw->tcr_enabled, dart->regs + DART_TCR(dart, sid));
 312 }
 313
 314 static void apple_dart_hw_disable_dma(struct apple_dart_stream_map *stream_map)
 315 {
 316         struct apple_dart *dart = stream_map->dart;
 317         int sid;
 318
 319         for_each_set_bit(sid, stream_map->sidmap, dart->num_streams)
 320                 writel(dart->hw->tcr_disabled, dart->regs + DART_TCR(dart, sid));
 321 }
 322
 323 static void
 324 apple_dart_hw_enable_bypass(struct apple_dart_stream_map *stream_map)
 325 {
 326         struct apple_dart *dart = stream_map->dart;
 327         int sid;
 328
 329         WARN_ON(!stream_map->dart->supports_bypass);
 330         for_each_set_bit(sid, stream_map->sidmap, dart->num_streams)
 331                 writel(dart->hw->tcr_bypass,
 332                        dart->regs + DART_TCR(dart, sid));
 333 }
 334
 335 static void apple_dart_hw_set_ttbr(struct apple_dart_stream_map *stream_map,
 336                                    u8 idx, phys_addr_t paddr)
 337 {
 338         struct apple_dart *dart = stream_map->dart;
 339         int sid;
 340
 341         WARN_ON(paddr & ((1 << dart->hw->ttbr_shift) - 1));
 342         for_each_set_bit(sid, stream_map->sidmap, dart->num_streams)
 343                 writel(dart->hw->ttbr_valid |
 344                        (paddr >> dart->hw->ttbr_shift) << dart->hw->ttbr_addr_field_shift,
 345                        dart->regs + DART_TTBR(dart, sid, idx));
 346 }
 347
 348 static void apple_dart_hw_clear_ttbr(struct apple_dart_stream_map *stream_map,
 349                                      u8 idx)
 350 {
 351         struct apple_dart *dart = stream_map->dart;
 352         int sid;
 353
 354         for_each_set_bit(sid, stream_map->sidmap, dart->num_streams)
 355                 writel(0, dart->regs + DART_TTBR(dart, sid, idx));
 356 }
 357
 358 static void
 359 apple_dart_hw_clear_all_ttbrs(struct apple_dart_stream_map *stream_map)
 360 {
 361         int i;
 362
 363         for (i = 0; i < stream_map->dart->hw->ttbr_count; ++i)
 364                 apple_dart_hw_clear_ttbr(stream_map, i);
 365 }
 366
 367 static int
 368 apple_dart_t8020_hw_stream_command(struct apple_dart_stream_map *stream_map,
 369                              u32 command)
 370 {
 371         unsigned long flags;
 372         int ret, i;
 373         u32 command_reg;
 374
 375         spin_lock_irqsave(&stream_map->dart->lock, flags);
 376
 377         for (i = 0; i < BITS_TO_U32(stream_map->dart->num_streams); i++)
 378                 writel(stream_map->sidmap[i],
 379                        stream_map->dart->regs + DART_T8020_STREAM_SELECT + 4 * i);
 380         writel(command, stream_map->dart->regs + DART_T8020_STREAM_COMMAND);
 381
 382         ret = readl_poll_timeout_atomic(
 383                 stream_map->dart->regs + DART_T8020_STREAM_COMMAND, command_reg,
 384                 !(command_reg & DART_T8020_STREAM_COMMAND_BUSY), 1,
 385                 DART_STREAM_COMMAND_BUSY_TIMEOUT);
 386
 387         spin_unlock_irqrestore(&stream_map->dart->lock, flags);
 388
 389         if (ret) {
 390                 dev_err(stream_map->dart->dev,
 391                         "busy bit did not clear after command %x for streams %lx\n",
 392                         command, stream_map->sidmap[0]);
 393                 return ret;
 394         }
 395
 396         return 0;
 397 }
 398
 399 static int
 400 apple_dart_t8110_hw_tlb_command(struct apple_dart_stream_map *stream_map,
 401                                 u32 command)
 402 {
 403         struct apple_dart *dart = stream_map->dart;
 404         unsigned long flags;
 405         int ret = 0;
 406         int sid;
 407
 408         spin_lock_irqsave(&dart->lock, flags);
 409
 410         for_each_set_bit(sid, stream_map->sidmap, dart->num_streams) {
 411                 u32 val = FIELD_PREP(DART_T8110_TLB_CMD_OP, command) |
 412                         FIELD_PREP(DART_T8110_TLB_CMD_STREAM, sid);
 413                 writel(val, dart->regs + DART_T8110_TLB_CMD);
 414
 415                 ret = readl_poll_timeout_atomic(
 416                         dart->regs + DART_T8110_TLB_CMD, val,
 417                         !(val & DART_T8110_TLB_CMD_BUSY), 1,
 418                         DART_STREAM_COMMAND_BUSY_TIMEOUT);
 419
 420                 if (ret)
 421                         break;
 422
 423         }
 424
 425         spin_unlock_irqrestore(&dart->lock, flags);
 426
 427         if (ret) {
 428                 dev_err(stream_map->dart->dev,
 429                         "busy bit did not clear after command %x for stream %d\n",
 430                         command, sid);
 431                 return ret;
 432         }
 433
 434         return 0;
 435 }
 436
 437 static int
 438 apple_dart_t8020_hw_invalidate_tlb(struct apple_dart_stream_map *stream_map)
 439 {
 440         return apple_dart_t8020_hw_stream_command(
 441                 stream_map, DART_T8020_STREAM_COMMAND_INVALIDATE);
 442 }
 443
 444 static int
 445 apple_dart_t8110_hw_invalidate_tlb(struct apple_dart_stream_map *stream_map)
 446 {
 447         return apple_dart_t8110_hw_tlb_command(
 448                 stream_map, DART_T8110_TLB_CMD_OP_FLUSH_SID);
 449 }
 450
 451 static int apple_dart_hw_reset(struct apple_dart *dart)
 452 {
 453         u32 config;
 454         struct apple_dart_stream_map stream_map;
 455         int i;
 456
 457         config = readl(dart->regs + dart->hw->lock);
 458         if (config & dart->hw->lock_bit) {
 459                 dev_err(dart->dev, "DART is locked down until reboot: %08x\n",
 460                         config);
 461                 return -EINVAL;
 462         }
 463
 464         stream_map.dart = dart;
 465         bitmap_zero(stream_map.sidmap, DART_MAX_STREAMS);
 466         bitmap_set(stream_map.sidmap, 0, dart->num_streams);
 467         apple_dart_hw_disable_dma(&stream_map);
 468         apple_dart_hw_clear_all_ttbrs(&stream_map);
 469
 470         /* enable all streams globally since TCR is used to control isolation */
 471         for (i = 0; i < BITS_TO_U32(dart->num_streams); i++)
 472                 writel(U32_MAX, dart->regs + dart->hw->enable_streams + 4 * i);
 473
 474         /* clear any pending errors before the interrupt is unmasked */
 475         writel(readl(dart->regs + dart->hw->error), dart->regs + dart->hw->error);
 476
 477         if (dart->hw->type == DART_T8110)
 478                 writel(0,  dart->regs + DART_T8110_ERROR_MASK);
 479
 480         return dart->hw->invalidate_tlb(&stream_map);
 481 }
 482
 483 static void apple_dart_domain_flush_tlb(struct apple_dart_domain *domain)
 484 {
 485         int i, j;
 486         struct apple_dart_atomic_stream_map *domain_stream_map;
 487         struct apple_dart_stream_map stream_map;
 488
 489         for_each_stream_map(i, domain, domain_stream_map) {
 490                 stream_map.dart = domain_stream_map->dart;
 491
 492                 for (j = 0; j < BITS_TO_LONGS(stream_map.dart->num_streams); j++)
 493                         stream_map.sidmap[j] = atomic_long_read(&domain_stream_map->sidmap[j]);
 494
 495                 stream_map.dart->hw->invalidate_tlb(&stream_map);
 496         }
 497 }
 498
 499 static void apple_dart_flush_iotlb_all(struct iommu_domain *domain)
 500 {
 501         apple_dart_domain_flush_tlb(to_dart_domain(domain));
 502 }
 503
 504 static void apple_dart_iotlb_sync(struct iommu_domain *domain,
 505                                   struct iommu_iotlb_gather *gather)
 506 {
 507         apple_dart_domain_flush_tlb(to_dart_domain(domain));
 508 }
 509
 510 static int apple_dart_iotlb_sync_map(struct iommu_domain *domain,
 511                                      unsigned long iova, size_t size)
 512 {
 513         apple_dart_domain_flush_tlb(to_dart_domain(domain));
 514         return 0;
 515 }
 516
 517 static phys_addr_t apple_dart_iova_to_phys(struct iommu_domain *domain,
 518                                            dma_addr_t iova)
 519 {
 520         struct apple_dart_domain *dart_domain = to_dart_domain(domain);
 521         struct io_pgtable_ops *ops = dart_domain->pgtbl_ops;
 522
 523         if (!ops)
 524                 return 0;
 525
 526         return ops->iova_to_phys(ops, iova);
 527 }
 528
 529 static int apple_dart_map_pages(struct iommu_domain *domain, unsigned long iova,
 530                                 phys_addr_t paddr, size_t pgsize,
 531                                 size_t pgcount, int prot, gfp_t gfp,
 532                                 size_t *mapped)
 533 {
 534         struct apple_dart_domain *dart_domain = to_dart_domain(domain);
 535         struct io_pgtable_ops *ops = dart_domain->pgtbl_ops;
 536
 537         if (!ops)
 538                 return -ENODEV;
 539
 540         return ops->map_pages(ops, iova, paddr, pgsize, pgcount, prot, gfp,
 541                               mapped);
 542 }
 543
 544 static size_t apple_dart_unmap_pages(struct iommu_domain *domain,
 545                                      unsigned long iova, size_t pgsize,
 546                                      size_t pgcount,
 547                                      struct iommu_iotlb_gather *gather)
 548 {
 549         struct apple_dart_domain *dart_domain = to_dart_domain(domain);
 550         struct io_pgtable_ops *ops = dart_domain->pgtbl_ops;
 551
 552         return ops->unmap_pages(ops, iova, pgsize, pgcount, gather);
 553 }
 554
 555 static void
 556 apple_dart_setup_translation(struct apple_dart_domain *domain,
 557                              struct apple_dart_stream_map *stream_map)
 558 {
 559         int i;
 560         struct io_pgtable_cfg *pgtbl_cfg =
 561                 &io_pgtable_ops_to_pgtable(domain->pgtbl_ops)->cfg;
 562
 563         for (i = 0; i < pgtbl_cfg->apple_dart_cfg.n_ttbrs; ++i)
 564                 apple_dart_hw_set_ttbr(stream_map, i,
 565                                        pgtbl_cfg->apple_dart_cfg.ttbr[i]);
 566         for (; i < stream_map->dart->hw->ttbr_count; ++i)
 567                 apple_dart_hw_clear_ttbr(stream_map, i);
 568
 569         apple_dart_hw_enable_translation(stream_map);
 570         stream_map->dart->hw->invalidate_tlb(stream_map);
 571 }
 572
 573 static int apple_dart_finalize_domain(struct apple_dart_domain *dart_domain,
 574                                       struct apple_dart_master_cfg *cfg)
 575 {
 576         struct apple_dart *dart = cfg->stream_maps[0].dart;
 577         struct io_pgtable_cfg pgtbl_cfg;
 578         int ret = 0;
 579         int i, j;
 580
 581         if (dart->pgsize > PAGE_SIZE)
 582                 return -EINVAL;
 583
 584         mutex_lock(&dart_domain->init_lock);
 585
 586         if (dart_domain->finalized)
 587                 goto done;
 588
 589         for (i = 0; i < MAX_DARTS_PER_DEVICE; ++i) {
 590                 dart_domain->stream_maps[i].dart = cfg->stream_maps[i].dart;
 591                 for (j = 0; j < BITS_TO_LONGS(dart->num_streams); j++)
 592                         atomic_long_set(&dart_domain->stream_maps[i].sidmap[j],
 593                                         cfg->stream_maps[i].sidmap[j]);
 594         }
 595
 596         pgtbl_cfg = (struct io_pgtable_cfg){
 597                 .pgsize_bitmap = dart->pgsize,
 598                 .ias = dart->ias,
 599                 .oas = dart->oas,
 600                 .coherent_walk = 1,
 601                 .iommu_dev = dart->dev,
 602         };
 603
 604         dart_domain->pgtbl_ops = alloc_io_pgtable_ops(dart->hw->fmt, &pgtbl_cfg,
 605                                                       &dart_domain->domain);
 606         if (!dart_domain->pgtbl_ops) {
 607                 ret = -ENOMEM;
 608                 goto done;
 609         }
 610
 611         dart_domain->domain.pgsize_bitmap = pgtbl_cfg.pgsize_bitmap;
 612         dart_domain->domain.geometry.aperture_start = 0;
 613         dart_domain->domain.geometry.aperture_end =
 614                 (dma_addr_t)DMA_BIT_MASK(dart->ias);
 615         dart_domain->domain.geometry.force_aperture = true;
 616
 617         dart_domain->finalized = true;
 618
 619 done:
 620         mutex_unlock(&dart_domain->init_lock);
 621         return ret;
 622 }
 623
 624 static int
 625 apple_dart_mod_streams(struct apple_dart_atomic_stream_map *domain_maps,
 626                        struct apple_dart_stream_map *master_maps,
 627                        bool add_streams)
 628 {
 629         int i, j;
 630
 631         for (i = 0; i < MAX_DARTS_PER_DEVICE; ++i) {
 632                 if (domain_maps[i].dart != master_maps[i].dart)
 633                         return -EINVAL;
 634         }
 635
 636         for (i = 0; i < MAX_DARTS_PER_DEVICE; ++i) {
 637                 if (!domain_maps[i].dart)
 638                         break;
 639                 for (j = 0; j < BITS_TO_LONGS(domain_maps[i].dart->num_streams); j++) {
 640                         if (add_streams)
 641                                 atomic_long_or(master_maps[i].sidmap[j],
 642                                                &domain_maps[i].sidmap[j]);
 643                         else
 644                                 atomic_long_and(~master_maps[i].sidmap[j],
 645                                                 &domain_maps[i].sidmap[j]);
 646                 }
 647         }
 648
 649         return 0;
 650 }
 651
 652 static int apple_dart_domain_add_streams(struct apple_dart_domain *domain,
 653                                          struct apple_dart_master_cfg *cfg)
 654 {
 655         return apple_dart_mod_streams(domain->stream_maps, cfg->stream_maps,
 656                                       true);
 657 }
 658
 659 static int apple_dart_attach_dev_paging(struct iommu_domain *domain,
 660                                         struct device *dev)
 661 {
 662         int ret, i;
 663         struct apple_dart_stream_map *stream_map;
 664         struct apple_dart_master_cfg *cfg = dev_iommu_priv_get(dev);
 665         struct apple_dart_domain *dart_domain = to_dart_domain(domain);
 666
 667         ret = apple_dart_finalize_domain(dart_domain, cfg);
 668         if (ret)
 669                 return ret;
 670
 671         ret = apple_dart_domain_add_streams(dart_domain, cfg);
 672         if (ret)
 673                 return ret;
 674
 675         for_each_stream_map(i, cfg, stream_map)
 676                 apple_dart_setup_translation(dart_domain, stream_map);
 677         return 0;
 678 }
 679
 680 static int apple_dart_attach_dev_identity(struct iommu_domain *domain,
 681                                           struct device *dev)
 682 {
 683         struct apple_dart_master_cfg *cfg = dev_iommu_priv_get(dev);
 684         struct apple_dart_stream_map *stream_map;
 685         int i;
 686
 687         if (!cfg->stream_maps[0].dart->supports_bypass)
 688                 return -EINVAL;
 689
 690         for_each_stream_map(i, cfg, stream_map)
 691                 apple_dart_hw_enable_bypass(stream_map);
 692         return 0;
 693 }
 694
 695 static const struct iommu_domain_ops apple_dart_identity_ops = {
 696         .attach_dev = apple_dart_attach_dev_identity,
 697 };
 698
 699 static struct iommu_domain apple_dart_identity_domain = {
 700         .type = IOMMU_DOMAIN_IDENTITY,
 701         .ops = &apple_dart_identity_ops,
 702 };
 703
 704 static int apple_dart_attach_dev_blocked(struct iommu_domain *domain,
 705                                          struct device *dev)
 706 {
 707         struct apple_dart_master_cfg *cfg = dev_iommu_priv_get(dev);
 708         struct apple_dart_stream_map *stream_map;
 709         int i;
 710
 711         for_each_stream_map(i, cfg, stream_map)
 712                 apple_dart_hw_disable_dma(stream_map);
 713         return 0;
 714 }
 715
 716 static const struct iommu_domain_ops apple_dart_blocked_ops = {
 717         .attach_dev = apple_dart_attach_dev_blocked,
 718 };
 719
 720 static struct iommu_domain apple_dart_blocked_domain = {
 721         .type = IOMMU_DOMAIN_BLOCKED,
 722         .ops = &apple_dart_blocked_ops,
 723 };
 724
 725 static struct iommu_device *apple_dart_probe_device(struct device *dev)
 726 {
 727         struct apple_dart_master_cfg *cfg = dev_iommu_priv_get(dev);
 728         struct apple_dart_stream_map *stream_map;
 729         int i;
 730
 731         if (!cfg)
 732                 return ERR_PTR(-ENODEV);
 733
 734         for_each_stream_map(i, cfg, stream_map)
 735                 device_link_add(
 736                         dev, stream_map->dart->dev,
 737                         DL_FLAG_PM_RUNTIME | DL_FLAG_AUTOREMOVE_SUPPLIER);
 738
 739         return &cfg->stream_maps[0].dart->iommu;
 740 }
 741
 742 static void apple_dart_release_device(struct device *dev)
 743 {
 744         struct apple_dart_master_cfg *cfg = dev_iommu_priv_get(dev);
 745
 746         kfree(cfg);
 747 }
 748
 749 static struct iommu_domain *apple_dart_domain_alloc_paging(struct device *dev)
 750 {
 751         struct apple_dart_domain *dart_domain;
 752
 753         dart_domain = kzalloc(sizeof(*dart_domain), GFP_KERNEL);
 754         if (!dart_domain)
 755                 return NULL;
 756
 757         mutex_init(&dart_domain->init_lock);
 758
 759         if (dev) {
 760                 struct apple_dart_master_cfg *cfg = dev_iommu_priv_get(dev);
 761                 int ret;
 762
 763                 ret = apple_dart_finalize_domain(dart_domain, cfg);
 764                 if (ret) {
 765                         kfree(dart_domain);
 766                         return ERR_PTR(ret);
 767                 }
 768         }
 769         return &dart_domain->domain;
 770 }
 771
 772 static void apple_dart_domain_free(struct iommu_domain *domain)
 773 {
 774         struct apple_dart_domain *dart_domain = to_dart_domain(domain);
 775
 776         if (dart_domain->pgtbl_ops)
 777                 free_io_pgtable_ops(dart_domain->pgtbl_ops);
 778
 779         kfree(dart_domain);
 780 }
 781
 782 static int apple_dart_of_xlate(struct device *dev,
 783                                const struct of_phandle_args *args)
 784 {
 785         struct apple_dart_master_cfg *cfg = dev_iommu_priv_get(dev);
 786         struct platform_device *iommu_pdev = of_find_device_by_node(args->np);
 787         struct apple_dart *dart = platform_get_drvdata(iommu_pdev);
 788         struct apple_dart *cfg_dart;
 789         int i, sid;
 790
 791         if (args->args_count != 1)
 792                 return -EINVAL;
 793         sid = args->args[0];
 794
 795         if (!cfg)
 796                 cfg = kzalloc(sizeof(*cfg), GFP_KERNEL);
 797         if (!cfg)
 798                 return -ENOMEM;
 799         dev_iommu_priv_set(dev, cfg);
 800
 801         cfg_dart = cfg->stream_maps[0].dart;
 802         if (cfg_dart) {
 803                 if (cfg_dart->supports_bypass != dart->supports_bypass)
 804                         return -EINVAL;
 805                 if (cfg_dart->pgsize != dart->pgsize)
 806                         return -EINVAL;
 807         }
 808
 809         for (i = 0; i < MAX_DARTS_PER_DEVICE; ++i) {
 810                 if (cfg->stream_maps[i].dart == dart) {
 811                         set_bit(sid, cfg->stream_maps[i].sidmap);
 812                         return 0;
 813                 }
 814         }
 815         for (i = 0; i < MAX_DARTS_PER_DEVICE; ++i) {
 816                 if (!cfg->stream_maps[i].dart) {
 817                         cfg->stream_maps[i].dart = dart;
 818                         set_bit(sid, cfg->stream_maps[i].sidmap);
 819                         return 0;
 820                 }
 821         }
 822
 823         return -EINVAL;
 824 }
 825
 826 static DEFINE_MUTEX(apple_dart_groups_lock);
 827
 828 static void apple_dart_release_group(void *iommu_data)
 829 {
 830         int i, sid;
 831         struct apple_dart_stream_map *stream_map;
 832         struct apple_dart_master_cfg *group_master_cfg = iommu_data;
 833
 834         mutex_lock(&apple_dart_groups_lock);
 835
 836         for_each_stream_map(i, group_master_cfg, stream_map)
 837                 for_each_set_bit(sid, stream_map->sidmap, stream_map->dart->num_streams)
 838                         stream_map->dart->sid2group[sid] = NULL;
 839
 840         kfree(iommu_data);
 841         mutex_unlock(&apple_dart_groups_lock);
 842 }
 843
 844 static int apple_dart_merge_master_cfg(struct apple_dart_master_cfg *dst,
 845                                        struct apple_dart_master_cfg *src)
 846 {
 847         /*
 848          * We know that this function is only called for groups returned from
 849          * pci_device_group and that all Apple Silicon platforms never spread
 850          * PCIe devices from the same bus across multiple DARTs such that we can
 851          * just assume that both src and dst only have the same single DART.
 852          */
 853         if (src->stream_maps[1].dart)
 854                 return -EINVAL;
 855         if (dst->stream_maps[1].dart)
 856                 return -EINVAL;
 857         if (src->stream_maps[0].dart != dst->stream_maps[0].dart)
 858                 return -EINVAL;
 859
 860         bitmap_or(dst->stream_maps[0].sidmap,
 861                   dst->stream_maps[0].sidmap,
 862                   src->stream_maps[0].sidmap,
 863                   dst->stream_maps[0].dart->num_streams);
 864         return 0;
 865 }
 866
 867 static struct iommu_group *apple_dart_device_group(struct device *dev)
 868 {
 869         int i, sid;
 870         struct apple_dart_master_cfg *cfg = dev_iommu_priv_get(dev);
 871         struct apple_dart_stream_map *stream_map;
 872         struct apple_dart_master_cfg *group_master_cfg;
 873         struct iommu_group *group = NULL;
 874         struct iommu_group *res = ERR_PTR(-EINVAL);
 875
 876         mutex_lock(&apple_dart_groups_lock);
 877
 878         for_each_stream_map(i, cfg, stream_map) {
 879                 for_each_set_bit(sid, stream_map->sidmap, stream_map->dart->num_streams) {
 880                         struct iommu_group *stream_group =
 881                                 stream_map->dart->sid2group[sid];
 882
 883                         if (group && group != stream_group) {
 884                                 res = ERR_PTR(-EINVAL);
 885                                 goto out;
 886                         }
 887
 888                         group = stream_group;
 889                 }
 890         }
 891
 892         if (group) {
 893                 res = iommu_group_ref_get(group);
 894                 goto out;
 895         }
 896
 897 #ifdef CONFIG_PCI
 898         if (dev_is_pci(dev))
 899                 group = pci_device_group(dev);
 900         else
 901 #endif
 902                 group = generic_device_group(dev);
 903
 904         res = ERR_PTR(-ENOMEM);
 905         if (!group)
 906                 goto out;
 907
 908         group_master_cfg = iommu_group_get_iommudata(group);
 909         if (group_master_cfg) {
 910                 int ret;
 911
 912                 ret = apple_dart_merge_master_cfg(group_master_cfg, cfg);
 913                 if (ret) {
 914                         dev_err(dev, "Failed to merge DART IOMMU groups.\n");
 915                         iommu_group_put(group);
 916                         res = ERR_PTR(ret);
 917                         goto out;
 918                 }
 919         } else {
 920                 group_master_cfg = kmemdup(cfg, sizeof(*group_master_cfg),
 921                                            GFP_KERNEL);
 922                 if (!group_master_cfg) {
 923                         iommu_group_put(group);
 924                         goto out;
 925                 }
 926
 927                 iommu_group_set_iommudata(group, group_master_cfg,
 928                         apple_dart_release_group);
 929         }
 930
 931         for_each_stream_map(i, cfg, stream_map)
 932                 for_each_set_bit(sid, stream_map->sidmap, stream_map->dart->num_streams)
 933                         stream_map->dart->sid2group[sid] = group;
 934
 935         res = group;
 936
 937 out:
 938         mutex_unlock(&apple_dart_groups_lock);
 939         return res;
 940 }
 941
 942 static int apple_dart_def_domain_type(struct device *dev)
 943 {
 944         struct apple_dart_master_cfg *cfg = dev_iommu_priv_get(dev);
 945
 946         if (cfg->stream_maps[0].dart->pgsize > PAGE_SIZE)
 947                 return IOMMU_DOMAIN_IDENTITY;
 948         if (!cfg->stream_maps[0].dart->supports_bypass)
 949                 return IOMMU_DOMAIN_DMA;
 950
 951         return 0;
 952 }
 953
 954 #ifndef CONFIG_PCIE_APPLE_MSI_DOORBELL_ADDR
 955 /* Keep things compiling when CONFIG_PCI_APPLE isn't selected */
 956 #define CONFIG_PCIE_APPLE_MSI_DOORBELL_ADDR     0
 957 #endif
 958 #define DOORBELL_ADDR   (CONFIG_PCIE_APPLE_MSI_DOORBELL_ADDR & PAGE_MASK)
 959
 960 static void apple_dart_get_resv_regions(struct device *dev,
 961                                         struct list_head *head)
 962 {
 963         if (IS_ENABLED(CONFIG_PCIE_APPLE) && dev_is_pci(dev)) {
 964                 struct iommu_resv_region *region;
 965                 int prot = IOMMU_WRITE | IOMMU_NOEXEC | IOMMU_MMIO;
 966
 967                 region = iommu_alloc_resv_region(DOORBELL_ADDR,
 968                                                  PAGE_SIZE, prot,
 969                                                  IOMMU_RESV_MSI, GFP_KERNEL);
 970                 if (!region)
 971                         return;
 972
 973                 list_add_tail(&region->list, head);
 974         }
 975
 976         iommu_dma_get_resv_regions(dev, head);
 977 }
 978
 979 static const struct iommu_ops apple_dart_iommu_ops = {
 980         .identity_domain = &apple_dart_identity_domain,
 981         .blocked_domain = &apple_dart_blocked_domain,
 982         .domain_alloc_paging = apple_dart_domain_alloc_paging,
 983         .probe_device = apple_dart_probe_device,
 984         .release_device = apple_dart_release_device,
 985         .device_group = apple_dart_device_group,
 986         .of_xlate = apple_dart_of_xlate,
 987         .def_domain_type = apple_dart_def_domain_type,
 988         .get_resv_regions = apple_dart_get_resv_regions,
 989         .pgsize_bitmap = -1UL, /* Restricted during dart probe */
 990         .owner = THIS_MODULE,
 991         .default_domain_ops = &(const struct iommu_domain_ops) {
 992                 .attach_dev     = apple_dart_attach_dev_paging,
 993                 .map_pages      = apple_dart_map_pages,
 994                 .unmap_pages    = apple_dart_unmap_pages,
 995                 .flush_iotlb_all = apple_dart_flush_iotlb_all,
 996                 .iotlb_sync     = apple_dart_iotlb_sync,
 997                 .iotlb_sync_map = apple_dart_iotlb_sync_map,
 998                 .iova_to_phys   = apple_dart_iova_to_phys,
 999                 .free           = apple_dart_domain_free,
1000         }
1001 };
1002
1003 static irqreturn_t apple_dart_t8020_irq(int irq, void *dev)
1004 {
1005         struct apple_dart *dart = dev;
1006         const char *fault_name = NULL;
1007         u32 error = readl(dart->regs + DART_T8020_ERROR);
1008         u32 error_code = FIELD_GET(DART_T8020_ERROR_CODE, error);
1009         u32 addr_lo = readl(dart->regs + DART_T8020_ERROR_ADDR_LO);
1010         u32 addr_hi = readl(dart->regs + DART_T8020_ERROR_ADDR_HI);
1011         u64 addr = addr_lo | (((u64)addr_hi) << 32);
1012         u8 stream_idx = FIELD_GET(DART_T8020_ERROR_STREAM, error);
1013
1014         if (!(error & DART_T8020_ERROR_FLAG))
1015                 return IRQ_NONE;
1016
1017         /* there should only be a single bit set but let's use == to be sure */
1018         if (error_code == DART_T8020_ERROR_READ_FAULT)
1019                 fault_name = "READ FAULT";
1020         else if (error_code == DART_T8020_ERROR_WRITE_FAULT)
1021                 fault_name = "WRITE FAULT";
1022         else if (error_code == DART_T8020_ERROR_NO_PTE)
1023                 fault_name = "NO PTE FOR IOVA";
1024         else if (error_code == DART_T8020_ERROR_NO_PMD)
1025                 fault_name = "NO PMD FOR IOVA";
1026         else if (error_code == DART_T8020_ERROR_NO_TTBR)
1027                 fault_name = "NO TTBR FOR IOVA";
1028         else
1029                 fault_name = "unknown";
1030
1031         dev_err_ratelimited(
1032                 dart->dev,
1033                 "translation fault: status:0x%x stream:%d code:0x%x (%s) at 0x%llx",
1034                 error, stream_idx, error_code, fault_name, addr);
1035
1036         writel(error, dart->regs + DART_T8020_ERROR);
1037         return IRQ_HANDLED;
1038 }
1039
1040 static irqreturn_t apple_dart_t8110_irq(int irq, void *dev)
1041 {
1042         struct apple_dart *dart = dev;
1043         const char *fault_name = NULL;
1044         u32 error = readl(dart->regs + DART_T8110_ERROR);
1045         u32 error_code = FIELD_GET(DART_T8110_ERROR_CODE, error);
1046         u32 addr_lo = readl(dart->regs + DART_T8110_ERROR_ADDR_LO);
1047         u32 addr_hi = readl(dart->regs + DART_T8110_ERROR_ADDR_HI);
1048         u64 addr = addr_lo | (((u64)addr_hi) << 32);
1049         u8 stream_idx = FIELD_GET(DART_T8110_ERROR_STREAM, error);
1050
1051         if (!(error & DART_T8110_ERROR_FLAG))
1052                 return IRQ_NONE;
1053
1054         /* there should only be a single bit set but let's use == to be sure */
1055         if (error_code == DART_T8110_ERROR_READ_FAULT)
1056                 fault_name = "READ FAULT";
1057         else if (error_code == DART_T8110_ERROR_WRITE_FAULT)
1058                 fault_name = "WRITE FAULT";
1059         else if (error_code == DART_T8110_ERROR_NO_PTE)
1060                 fault_name = "NO PTE FOR IOVA";
1061         else if (error_code == DART_T8110_ERROR_NO_PMD)
1062                 fault_name = "NO PMD FOR IOVA";
1063         else if (error_code == DART_T8110_ERROR_NO_PGD)
1064                 fault_name = "NO PGD FOR IOVA";
1065         else if (error_code == DART_T8110_ERROR_NO_TTBR)
1066                 fault_name = "NO TTBR FOR IOVA";
1067         else
1068                 fault_name = "unknown";
1069
1070         dev_err_ratelimited(
1071                 dart->dev,
1072                 "translation fault: status:0x%x stream:%d code:0x%x (%s) at 0x%llx",
1073                 error, stream_idx, error_code, fault_name, addr);
1074
1075         writel(error, dart->regs + DART_T8110_ERROR);
1076         return IRQ_HANDLED;
1077 }
1078
1079 static int apple_dart_probe(struct platform_device *pdev)
1080 {
1081         int ret;
1082         u32 dart_params[4];
1083         struct resource *res;
1084         struct apple_dart *dart;
1085         struct device *dev = &pdev->dev;
1086
1087         dart = devm_kzalloc(dev, sizeof(*dart), GFP_KERNEL);
1088         if (!dart)
1089                 return -ENOMEM;
1090
1091         dart->dev = dev;
1092         dart->hw = of_device_get_match_data(dev);
1093         spin_lock_init(&dart->lock);
1094
1095         dart->regs = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
1096         if (IS_ERR(dart->regs))
1097                 return PTR_ERR(dart->regs);
1098
1099         if (resource_size(res) < 0x4000) {
1100                 dev_err(dev, "MMIO region too small (%pr)\n", res);
1101                 return -EINVAL;
1102         }
1103
1104         dart->irq = platform_get_irq(pdev, 0);
1105         if (dart->irq < 0)
1106                 return -ENODEV;
1107
1108         ret = devm_clk_bulk_get_all(dev, &dart->clks);
1109         if (ret < 0)
1110                 return ret;
1111         dart->num_clks = ret;
1112
1113         ret = clk_bulk_prepare_enable(dart->num_clks, dart->clks);
1114         if (ret)
1115                 return ret;
1116
1117         dart_params[0] = readl(dart->regs + DART_PARAMS1);
1118         dart_params[1] = readl(dart->regs + DART_PARAMS2);
1119         dart->pgsize = 1 << FIELD_GET(DART_PARAMS1_PAGE_SHIFT, dart_params[0]);
1120         dart->supports_bypass = dart_params[1] & DART_PARAMS2_BYPASS_SUPPORT;
1121
1122         switch (dart->hw->type) {
1123         case DART_T8020:
1124         case DART_T6000:
1125                 dart->ias = 32;
1126                 dart->oas = dart->hw->oas;
1127                 dart->num_streams = dart->hw->max_sid_count;
1128                 break;
1129
1130         case DART_T8110:
1131                 dart_params[2] = readl(dart->regs + DART_T8110_PARAMS3);
1132                 dart_params[3] = readl(dart->regs + DART_T8110_PARAMS4);
1133                 dart->ias = FIELD_GET(DART_T8110_PARAMS3_VA_WIDTH, dart_params[2]);
1134                 dart->oas = FIELD_GET(DART_T8110_PARAMS3_PA_WIDTH, dart_params[2]);
1135                 dart->num_streams = FIELD_GET(DART_T8110_PARAMS4_NUM_SIDS, dart_params[3]);
1136                 break;
1137         }
1138
1139         if (dart->num_streams > DART_MAX_STREAMS) {
1140                 dev_err(&pdev->dev, "Too many streams (%d > %d)\n",
1141                         dart->num_streams, DART_MAX_STREAMS);
1142                 ret = -EINVAL;
1143                 goto err_clk_disable;
1144         }
1145
1146         ret = apple_dart_hw_reset(dart);
1147         if (ret)
1148                 goto err_clk_disable;
1149
1150         ret = request_irq(dart->irq, dart->hw->irq_handler, IRQF_SHARED,
1151                           "apple-dart fault handler", dart);
1152         if (ret)
1153                 goto err_clk_disable;
1154
1155         platform_set_drvdata(pdev, dart);
1156
1157         ret = iommu_device_sysfs_add(&dart->iommu, dev, NULL, "apple-dart.%s",
1158                                      dev_name(&pdev->dev));
1159         if (ret)
1160                 goto err_free_irq;
1161
1162         ret = iommu_device_register(&dart->iommu, &apple_dart_iommu_ops, dev);
1163         if (ret)
1164                 goto err_sysfs_remove;
1165
1166         dev_info(
1167                 &pdev->dev,
1168                 "DART [pagesize %x, %d streams, bypass support: %d, bypass forced: %d] initialized\n",
1169                 dart->pgsize, dart->num_streams, dart->supports_bypass,
1170                 dart->pgsize > PAGE_SIZE);
1171         return 0;
1172
1173 err_sysfs_remove:
1174         iommu_device_sysfs_remove(&dart->iommu);
1175 err_free_irq:
1176         free_irq(dart->irq, dart);
1177 err_clk_disable:
1178         clk_bulk_disable_unprepare(dart->num_clks, dart->clks);
1179
1180         return ret;
1181 }
1182
1183 static void apple_dart_remove(struct platform_device *pdev)
1184 {
1185         struct apple_dart *dart = platform_get_drvdata(pdev);
1186
1187         apple_dart_hw_reset(dart);
1188         free_irq(dart->irq, dart);
1189
1190         iommu_device_unregister(&dart->iommu);
1191         iommu_device_sysfs_remove(&dart->iommu);
1192
1193         clk_bulk_disable_unprepare(dart->num_clks, dart->clks);
1194 }
1195
1196 static const struct apple_dart_hw apple_dart_hw_t8103 = {
1197         .type = DART_T8020,
1198         .irq_handler = apple_dart_t8020_irq,
1199         .invalidate_tlb = apple_dart_t8020_hw_invalidate_tlb,
1200         .oas = 36,
1201         .fmt = APPLE_DART,
1202         .max_sid_count = 16,
1203
1204         .enable_streams = DART_T8020_STREAMS_ENABLE,
1205         .lock = DART_T8020_CONFIG,
1206         .lock_bit = DART_T8020_CONFIG_LOCK,
1207
1208         .error = DART_T8020_ERROR,
1209
1210         .tcr = DART_T8020_TCR,
1211         .tcr_enabled = DART_T8020_TCR_TRANSLATE_ENABLE,
1212         .tcr_disabled = 0,
1213         .tcr_bypass = DART_T8020_TCR_BYPASS_DAPF | DART_T8020_TCR_BYPASS_DART,
1214
1215         .ttbr = DART_T8020_TTBR,
1216         .ttbr_valid = DART_T8020_TTBR_VALID,
1217         .ttbr_addr_field_shift = DART_T8020_TTBR_ADDR_FIELD_SHIFT,
1218         .ttbr_shift = DART_T8020_TTBR_SHIFT,
1219         .ttbr_count = 4,
1220 };
1221
1222 static const struct apple_dart_hw apple_dart_hw_t8103_usb4 = {
1223         .type = DART_T8020,
1224         .irq_handler = apple_dart_t8020_irq,
1225         .invalidate_tlb = apple_dart_t8020_hw_invalidate_tlb,
1226         .oas = 36,
1227         .fmt = APPLE_DART,
1228         .max_sid_count = 64,
1229
1230         .enable_streams = DART_T8020_STREAMS_ENABLE,
1231         .lock = DART_T8020_CONFIG,
1232         .lock_bit = DART_T8020_CONFIG_LOCK,
1233
1234         .error = DART_T8020_ERROR,
1235
1236         .tcr = DART_T8020_TCR,
1237         .tcr_enabled = DART_T8020_TCR_TRANSLATE_ENABLE,
1238         .tcr_disabled = 0,
1239         .tcr_bypass = 0,
1240
1241         .ttbr = DART_T8020_USB4_TTBR,
1242         .ttbr_valid = DART_T8020_TTBR_VALID,
1243         .ttbr_addr_field_shift = DART_T8020_TTBR_ADDR_FIELD_SHIFT,
1244         .ttbr_shift = DART_T8020_TTBR_SHIFT,
1245         .ttbr_count = 4,
1246 };
1247
1248 static const struct apple_dart_hw apple_dart_hw_t6000 = {
1249         .type = DART_T6000,
1250         .irq_handler = apple_dart_t8020_irq,
1251         .invalidate_tlb = apple_dart_t8020_hw_invalidate_tlb,
1252         .oas = 42,
1253         .fmt = APPLE_DART2,
1254         .max_sid_count = 16,
1255
1256         .enable_streams = DART_T8020_STREAMS_ENABLE,
1257         .lock = DART_T8020_CONFIG,
1258         .lock_bit = DART_T8020_CONFIG_LOCK,
1259
1260         .error = DART_T8020_ERROR,
1261
1262         .tcr = DART_T8020_TCR,
1263         .tcr_enabled = DART_T8020_TCR_TRANSLATE_ENABLE,
1264         .tcr_disabled = 0,
1265         .tcr_bypass = DART_T8020_TCR_BYPASS_DAPF | DART_T8020_TCR_BYPASS_DART,
1266
1267         .ttbr = DART_T8020_TTBR,
1268         .ttbr_valid = DART_T8020_TTBR_VALID,
1269         .ttbr_addr_field_shift = DART_T8020_TTBR_ADDR_FIELD_SHIFT,
1270         .ttbr_shift = DART_T8020_TTBR_SHIFT,
1271         .ttbr_count = 4,
1272 };
1273
1274 static const struct apple_dart_hw apple_dart_hw_t8110 = {
1275         .type = DART_T8110,
1276         .irq_handler = apple_dart_t8110_irq,
1277         .invalidate_tlb = apple_dart_t8110_hw_invalidate_tlb,
1278         .fmt = APPLE_DART2,
1279         .max_sid_count = 256,
1280
1281         .enable_streams = DART_T8110_ENABLE_STREAMS,
1282         .lock = DART_T8110_PROTECT,
1283         .lock_bit = DART_T8110_PROTECT_TTBR_TCR,
1284
1285         .error = DART_T8110_ERROR,
1286
1287         .tcr = DART_T8110_TCR,
1288         .tcr_enabled = DART_T8110_TCR_TRANSLATE_ENABLE,
1289         .tcr_disabled = 0,
1290         .tcr_bypass = DART_T8110_TCR_BYPASS_DAPF | DART_T8110_TCR_BYPASS_DART,
1291
1292         .ttbr = DART_T8110_TTBR,
1293         .ttbr_valid = DART_T8110_TTBR_VALID,
1294         .ttbr_addr_field_shift = DART_T8110_TTBR_ADDR_FIELD_SHIFT,
1295         .ttbr_shift = DART_T8110_TTBR_SHIFT,
1296         .ttbr_count = 1,
1297 };
1298
1299 static __maybe_unused int apple_dart_suspend(struct device *dev)
1300 {
1301         struct apple_dart *dart = dev_get_drvdata(dev);
1302         unsigned int sid, idx;
1303
1304         for (sid = 0; sid < dart->num_streams; sid++) {
1305                 dart->save_tcr[sid] = readl(dart->regs + DART_TCR(dart, sid));
1306                 for (idx = 0; idx < dart->hw->ttbr_count; idx++)
1307                         dart->save_ttbr[sid][idx] =
1308                                 readl(dart->regs + DART_TTBR(dart, sid, idx));
1309         }
1310
1311         return 0;
1312 }
1313
1314 static __maybe_unused int apple_dart_resume(struct device *dev)
1315 {
1316         struct apple_dart *dart = dev_get_drvdata(dev);
1317         unsigned int sid, idx;
1318         int ret;
1319
1320         ret = apple_dart_hw_reset(dart);
1321         if (ret) {
1322                 dev_err(dev, "Failed to reset DART on resume\n");
1323                 return ret;
1324         }
1325
1326         for (sid = 0; sid < dart->num_streams; sid++) {
1327                 for (idx = 0; idx < dart->hw->ttbr_count; idx++)
1328                         writel(dart->save_ttbr[sid][idx],
1329                                dart->regs + DART_TTBR(dart, sid, idx));
1330                 writel(dart->save_tcr[sid], dart->regs + DART_TCR(dart, sid));
1331         }
1332
1333         return 0;
1334 }
1335
1336 static DEFINE_SIMPLE_DEV_PM_OPS(apple_dart_pm_ops, apple_dart_suspend, apple_dart_resume);
1337
1338 static const struct of_device_id apple_dart_of_match[] = {
1339         { .compatible = "apple,t8103-dart", .data = &apple_dart_hw_t8103 },
1340         { .compatible = "apple,t8103-usb4-dart", .data = &apple_dart_hw_t8103_usb4 },
1341         { .compatible = "apple,t8110-dart", .data = &apple_dart_hw_t8110 },
1342         { .compatible = "apple,t6000-dart", .data = &apple_dart_hw_t6000 },
1343         {},
1344 };
1345 MODULE_DEVICE_TABLE(of, apple_dart_of_match);
1346
1347 static struct platform_driver apple_dart_driver = {
1348         .driver = {
1349                 .name                   = "apple-dart",
1350                 .of_match_table         = apple_dart_of_match,
1351                 .suppress_bind_attrs    = true,
1352                 .pm                     = pm_sleep_ptr(&apple_dart_pm_ops),
1353         },
1354         .probe  = apple_dart_probe,
1355         .remove_new = apple_dart_remove,
1356 };
1357
1358 module_platform_driver(apple_dart_driver);
1359
1360 MODULE_DESCRIPTION("IOMMU API for Apple's DART");
1361 MODULE_AUTHOR("Sven Peter <sven@svenpeter.dev>");
1362 MODULE_LICENSE("GPL v2");