drivers/gpu/host1x/dev.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Tegra host1x driver
   4  *
   5  * Copyright (c) 2010-2013, NVIDIA Corporation.
   6  */
   7
   8 #include <linux/clk.h>
   9 #include <linux/delay.h>
  10 #include <linux/dma-mapping.h>
  11 #include <linux/io.h>
  12 #include <linux/list.h>
  13 #include <linux/module.h>
  14 #include <linux/of_device.h>
  15 #include <linux/of.h>
  16 #include <linux/pm_runtime.h>
  17 #include <linux/slab.h>
  18
  19 #include <soc/tegra/common.h>
  20
  21 #define CREATE_TRACE_POINTS
  22 #include <trace/events/host1x.h>
  23 #undef CREATE_TRACE_POINTS
  24
  25 #if IS_ENABLED(CONFIG_ARM_DMA_USE_IOMMU)
  26 #include <asm/dma-iommu.h>
  27 #endif
  28
  29 #include "bus.h"
  30 #include "channel.h"
  31 #include "context.h"
  32 #include "debug.h"
  33 #include "dev.h"
  34 #include "intr.h"
  35
  36 #include "hw/host1x01.h"
  37 #include "hw/host1x02.h"
  38 #include "hw/host1x04.h"
  39 #include "hw/host1x05.h"
  40 #include "hw/host1x06.h"
  41 #include "hw/host1x07.h"
  42 #include "hw/host1x08.h"
  43
  44 void host1x_common_writel(struct host1x *host1x, u32 v, u32 r)
  45 {
  46         writel(v, host1x->common_regs + r);
  47 }
  48
  49 void host1x_hypervisor_writel(struct host1x *host1x, u32 v, u32 r)
  50 {
  51         writel(v, host1x->hv_regs + r);
  52 }
  53
  54 u32 host1x_hypervisor_readl(struct host1x *host1x, u32 r)
  55 {
  56         return readl(host1x->hv_regs + r);
  57 }
  58
  59 void host1x_sync_writel(struct host1x *host1x, u32 v, u32 r)
  60 {
  61         void __iomem *sync_regs = host1x->regs + host1x->info->sync_offset;
  62
  63         writel(v, sync_regs + r);
  64 }
  65
  66 u32 host1x_sync_readl(struct host1x *host1x, u32 r)
  67 {
  68         void __iomem *sync_regs = host1x->regs + host1x->info->sync_offset;
  69
  70         return readl(sync_regs + r);
  71 }
  72
  73 void host1x_ch_writel(struct host1x_channel *ch, u32 v, u32 r)
  74 {
  75         writel(v, ch->regs + r);
  76 }
  77
  78 u32 host1x_ch_readl(struct host1x_channel *ch, u32 r)
  79 {
  80         return readl(ch->regs + r);
  81 }
  82
  83 static const struct host1x_info host1x01_info = {
  84         .nb_channels = 8,
  85         .nb_pts = 32,
  86         .nb_mlocks = 16,
  87         .nb_bases = 8,
  88         .init = host1x01_init,
  89         .sync_offset = 0x3000,
  90         .dma_mask = DMA_BIT_MASK(32),
  91         .has_wide_gather = false,
  92         .has_hypervisor = false,
  93         .num_sid_entries = 0,
  94         .sid_table = NULL,
  95         .reserve_vblank_syncpts = true,
  96 };
  97
  98 static const struct host1x_info host1x02_info = {
  99         .nb_channels = 9,
 100         .nb_pts = 32,
 101         .nb_mlocks = 16,
 102         .nb_bases = 12,
 103         .init = host1x02_init,
 104         .sync_offset = 0x3000,
 105         .dma_mask = DMA_BIT_MASK(32),
 106         .has_wide_gather = false,
 107         .has_hypervisor = false,
 108         .num_sid_entries = 0,
 109         .sid_table = NULL,
 110         .reserve_vblank_syncpts = true,
 111 };
 112
 113 static const struct host1x_info host1x04_info = {
 114         .nb_channels = 12,
 115         .nb_pts = 192,
 116         .nb_mlocks = 16,
 117         .nb_bases = 64,
 118         .init = host1x04_init,
 119         .sync_offset = 0x2100,
 120         .dma_mask = DMA_BIT_MASK(34),
 121         .has_wide_gather = false,
 122         .has_hypervisor = false,
 123         .num_sid_entries = 0,
 124         .sid_table = NULL,
 125         .reserve_vblank_syncpts = false,
 126 };
 127
 128 static const struct host1x_info host1x05_info = {
 129         .nb_channels = 14,
 130         .nb_pts = 192,
 131         .nb_mlocks = 16,
 132         .nb_bases = 64,
 133         .init = host1x05_init,
 134         .sync_offset = 0x2100,
 135         .dma_mask = DMA_BIT_MASK(34),
 136         .has_wide_gather = false,
 137         .has_hypervisor = false,
 138         .num_sid_entries = 0,
 139         .sid_table = NULL,
 140         .reserve_vblank_syncpts = false,
 141 };
 142
 143 static const struct host1x_sid_entry tegra186_sid_table[] = {
 144         {
 145                 /* VIC */
 146                 .base = 0x1af0,
 147                 .offset = 0x30,
 148                 .limit = 0x34
 149         },
 150         {
 151                 /* NVDEC */
 152                 .base = 0x1b00,
 153                 .offset = 0x30,
 154                 .limit = 0x34
 155         },
 156 };
 157
 158 static const struct host1x_info host1x06_info = {
 159         .nb_channels = 63,
 160         .nb_pts = 576,
 161         .nb_mlocks = 24,
 162         .nb_bases = 16,
 163         .init = host1x06_init,
 164         .sync_offset = 0x0,
 165         .dma_mask = DMA_BIT_MASK(40),
 166         .has_wide_gather = true,
 167         .has_hypervisor = true,
 168         .num_sid_entries = ARRAY_SIZE(tegra186_sid_table),
 169         .sid_table = tegra186_sid_table,
 170         .reserve_vblank_syncpts = false,
 171 };
 172
 173 static const struct host1x_sid_entry tegra194_sid_table[] = {
 174         {
 175                 /* VIC */
 176                 .base = 0x1af0,
 177                 .offset = 0x30,
 178                 .limit = 0x34
 179         },
 180         {
 181                 /* NVDEC */
 182                 .base = 0x1b00,
 183                 .offset = 0x30,
 184                 .limit = 0x34
 185         },
 186         {
 187                 /* NVDEC1 */
 188                 .base = 0x1bc0,
 189                 .offset = 0x30,
 190                 .limit = 0x34
 191         },
 192 };
 193
 194 static const struct host1x_info host1x07_info = {
 195         .nb_channels = 63,
 196         .nb_pts = 704,
 197         .nb_mlocks = 32,
 198         .nb_bases = 0,
 199         .init = host1x07_init,
 200         .sync_offset = 0x0,
 201         .dma_mask = DMA_BIT_MASK(40),
 202         .has_wide_gather = true,
 203         .has_hypervisor = true,
 204         .num_sid_entries = ARRAY_SIZE(tegra194_sid_table),
 205         .sid_table = tegra194_sid_table,
 206         .reserve_vblank_syncpts = false,
 207 };
 208
 209 /*
 210  * Tegra234 has two stream ID protection tables, one for setting stream IDs
 211  * through the channel path via SETSTREAMID, and one for setting them via
 212  * MMIO. We program each engine's data stream ID in the channel path table
 213  * and firmware stream ID in the MMIO path table.
 214  */
 215 static const struct host1x_sid_entry tegra234_sid_table[] = {
 216         {
 217                 /* VIC channel */
 218                 .base = 0x17b8,
 219                 .offset = 0x30,
 220                 .limit = 0x30
 221         },
 222         {
 223                 /* VIC MMIO */
 224                 .base = 0x1688,
 225                 .offset = 0x34,
 226                 .limit = 0x34
 227         },
 228         {
 229                 /* NVDEC channel */
 230                 .base = 0x17c8,
 231                 .offset = 0x30,
 232                 .limit = 0x30,
 233         },
 234         {
 235                 /* NVDEC MMIO */
 236                 .base = 0x1698,
 237                 .offset = 0x34,
 238                 .limit = 0x34,
 239         },
 240 };
 241
 242 static const struct host1x_info host1x08_info = {
 243         .nb_channels = 63,
 244         .nb_pts = 1024,
 245         .nb_mlocks = 24,
 246         .nb_bases = 0,
 247         .init = host1x08_init,
 248         .sync_offset = 0x0,
 249         .dma_mask = DMA_BIT_MASK(40),
 250         .has_wide_gather = true,
 251         .has_hypervisor = true,
 252         .has_common = true,
 253         .num_sid_entries = ARRAY_SIZE(tegra234_sid_table),
 254         .sid_table = tegra234_sid_table,
 255         .streamid_vm_table = { 0x1004, 128 },
 256         .classid_vm_table = { 0x1404, 25 },
 257         .mmio_vm_table = { 0x1504, 25 },
 258         .reserve_vblank_syncpts = false,
 259 };
 260
 261 static const struct of_device_id host1x_of_match[] = {
 262         { .compatible = "nvidia,tegra234-host1x", .data = &host1x08_info, },
 263         { .compatible = "nvidia,tegra194-host1x", .data = &host1x07_info, },
 264         { .compatible = "nvidia,tegra186-host1x", .data = &host1x06_info, },
 265         { .compatible = "nvidia,tegra210-host1x", .data = &host1x05_info, },
 266         { .compatible = "nvidia,tegra124-host1x", .data = &host1x04_info, },
 267         { .compatible = "nvidia,tegra114-host1x", .data = &host1x02_info, },
 268         { .compatible = "nvidia,tegra30-host1x", .data = &host1x01_info, },
 269         { .compatible = "nvidia,tegra20-host1x", .data = &host1x01_info, },
 270         { },
 271 };
 272 MODULE_DEVICE_TABLE(of, host1x_of_match);
 273
 274 static void host1x_setup_virtualization_tables(struct host1x *host)
 275 {
 276         const struct host1x_info *info = host->info;
 277         unsigned int i;
 278
 279         if (!info->has_hypervisor)
 280                 return;
 281
 282         for (i = 0; i < info->num_sid_entries; i++) {
 283                 const struct host1x_sid_entry *entry = &info->sid_table[i];
 284
 285                 host1x_hypervisor_writel(host, entry->offset, entry->base);
 286                 host1x_hypervisor_writel(host, entry->limit, entry->base + 4);
 287         }
 288
 289         for (i = 0; i < info->streamid_vm_table.count; i++) {
 290                 /* Allow access to all stream IDs to all VMs. */
 291                 host1x_hypervisor_writel(host, 0xff, info->streamid_vm_table.base + 4 * i);
 292         }
 293
 294         for (i = 0; i < info->classid_vm_table.count; i++) {
 295                 /* Allow access to all classes to all VMs. */
 296                 host1x_hypervisor_writel(host, 0xff, info->classid_vm_table.base + 4 * i);
 297         }
 298
 299         for (i = 0; i < info->mmio_vm_table.count; i++) {
 300                 /* Use VM1 (that's us) as originator VMID for engine MMIO accesses. */
 301                 host1x_hypervisor_writel(host, 0x1, info->mmio_vm_table.base + 4 * i);
 302         }
 303 }
 304
 305 static bool host1x_wants_iommu(struct host1x *host1x)
 306 {
 307         /* Our IOMMU usage policy doesn't currently play well with GART */
 308         if (of_machine_is_compatible("nvidia,tegra20"))
 309                 return false;
 310
 311         /*
 312          * If we support addressing a maximum of 32 bits of physical memory
 313          * and if the host1x firewall is enabled, there's no need to enable
 314          * IOMMU support. This can happen for example on Tegra20, Tegra30
 315          * and Tegra114.
 316          *
 317          * Tegra124 and later can address up to 34 bits of physical memory and
 318          * many platforms come equipped with more than 2 GiB of system memory,
 319          * which requires crossing the 4 GiB boundary. But there's a catch: on
 320          * SoCs before Tegra186 (i.e. Tegra124 and Tegra210), the host1x can
 321          * only address up to 32 bits of memory in GATHER opcodes, which means
 322          * that command buffers need to either be in the first 2 GiB of system
 323          * memory (which could quickly lead to memory exhaustion), or command
 324          * buffers need to be treated differently from other buffers (which is
 325          * not possible with the current ABI).
 326          *
 327          * A third option is to use the IOMMU in these cases to make sure all
 328          * buffers will be mapped into a 32-bit IOVA space that host1x can
 329          * address. This allows all of the system memory to be used and works
 330          * within the limitations of the host1x on these SoCs.
 331          *
 332          * In summary, default to enable IOMMU on Tegra124 and later. For any
 333          * of the earlier SoCs, only use the IOMMU for additional safety when
 334          * the host1x firewall is disabled.
 335          */
 336         if (host1x->info->dma_mask <= DMA_BIT_MASK(32)) {
 337                 if (IS_ENABLED(CONFIG_TEGRA_HOST1X_FIREWALL))
 338                         return false;
 339         }
 340
 341         return true;
 342 }
 343
 344 static struct iommu_domain *host1x_iommu_attach(struct host1x *host)
 345 {
 346         struct iommu_domain *domain = iommu_get_domain_for_dev(host->dev);
 347         int err;
 348
 349 #if IS_ENABLED(CONFIG_ARM_DMA_USE_IOMMU)
 350         if (host->dev->archdata.mapping) {
 351                 struct dma_iommu_mapping *mapping =
 352                                 to_dma_iommu_mapping(host->dev);
 353                 arm_iommu_detach_device(host->dev);
 354                 arm_iommu_release_mapping(mapping);
 355
 356                 domain = iommu_get_domain_for_dev(host->dev);
 357         }
 358 #endif
 359
 360         /*
 361          * We may not always want to enable IOMMU support (for example if the
 362          * host1x firewall is already enabled and we don't support addressing
 363          * more than 32 bits of physical memory), so check for that first.
 364          *
 365          * Similarly, if host1x is already attached to an IOMMU (via the DMA
 366          * API), don't try to attach again.
 367          */
 368         if (!host1x_wants_iommu(host) || domain)
 369                 return domain;
 370
 371         host->group = iommu_group_get(host->dev);
 372         if (host->group) {
 373                 struct iommu_domain_geometry *geometry;
 374                 dma_addr_t start, end;
 375                 unsigned long order;
 376
 377                 err = iova_cache_get();
 378                 if (err < 0)
 379                         goto put_group;
 380
 381                 host->domain = iommu_domain_alloc(&platform_bus_type);
 382                 if (!host->domain) {
 383                         err = -ENOMEM;
 384                         goto put_cache;
 385                 }
 386
 387                 err = iommu_attach_group(host->domain, host->group);
 388                 if (err) {
 389                         if (err == -ENODEV)
 390                                 err = 0;
 391
 392                         goto free_domain;
 393                 }
 394
 395                 geometry = &host->domain->geometry;
 396                 start = geometry->aperture_start & host->info->dma_mask;
 397                 end = geometry->aperture_end & host->info->dma_mask;
 398
 399                 order = __ffs(host->domain->pgsize_bitmap);
 400                 init_iova_domain(&host->iova, 1UL << order, start >> order);
 401                 host->iova_end = end;
 402
 403                 domain = host->domain;
 404         }
 405
 406         return domain;
 407
 408 free_domain:
 409         iommu_domain_free(host->domain);
 410         host->domain = NULL;
 411 put_cache:
 412         iova_cache_put();
 413 put_group:
 414         iommu_group_put(host->group);
 415         host->group = NULL;
 416
 417         return ERR_PTR(err);
 418 }
 419
 420 static int host1x_iommu_init(struct host1x *host)
 421 {
 422         u64 mask = host->info->dma_mask;
 423         struct iommu_domain *domain;
 424         int err;
 425
 426         domain = host1x_iommu_attach(host);
 427         if (IS_ERR(domain)) {
 428                 err = PTR_ERR(domain);
 429                 dev_err(host->dev, "failed to attach to IOMMU: %d\n", err);
 430                 return err;
 431         }
 432
 433         /*
 434          * If we're not behind an IOMMU make sure we don't get push buffers
 435          * that are allocated outside of the range addressable by the GATHER
 436          * opcode.
 437          *
 438          * Newer generations of Tegra (Tegra186 and later) support a wide
 439          * variant of the GATHER opcode that allows addressing more bits.
 440          */
 441         if (!domain && !host->info->has_wide_gather)
 442                 mask = DMA_BIT_MASK(32);
 443
 444         err = dma_coerce_mask_and_coherent(host->dev, mask);
 445         if (err < 0) {
 446                 dev_err(host->dev, "failed to set DMA mask: %d\n", err);
 447                 return err;
 448         }
 449
 450         return 0;
 451 }
 452
 453 static void host1x_iommu_exit(struct host1x *host)
 454 {
 455         if (host->domain) {
 456                 put_iova_domain(&host->iova);
 457                 iommu_detach_group(host->domain, host->group);
 458
 459                 iommu_domain_free(host->domain);
 460                 host->domain = NULL;
 461
 462                 iova_cache_put();
 463
 464                 iommu_group_put(host->group);
 465                 host->group = NULL;
 466         }
 467 }
 468
 469 static int host1x_get_resets(struct host1x *host)
 470 {
 471         int err;
 472
 473         host->resets[0].id = "mc";
 474         host->resets[1].id = "host1x";
 475         host->nresets = ARRAY_SIZE(host->resets);
 476
 477         err = devm_reset_control_bulk_get_optional_exclusive_released(
 478                                 host->dev, host->nresets, host->resets);
 479         if (err) {
 480                 dev_err(host->dev, "failed to get reset: %d\n", err);
 481                 return err;
 482         }
 483
 484         return 0;
 485 }
 486
 487 static int host1x_probe(struct platform_device *pdev)
 488 {
 489         struct host1x *host;
 490         int err;
 491
 492         host = devm_kzalloc(&pdev->dev, sizeof(*host), GFP_KERNEL);
 493         if (!host)
 494                 return -ENOMEM;
 495
 496         host->info = of_device_get_match_data(&pdev->dev);
 497
 498         if (host->info->has_hypervisor) {
 499                 host->regs = devm_platform_ioremap_resource_byname(pdev, "vm");
 500                 if (IS_ERR(host->regs))
 501                         return PTR_ERR(host->regs);
 502
 503                 host->hv_regs = devm_platform_ioremap_resource_byname(pdev, "hypervisor");
 504                 if (IS_ERR(host->hv_regs))
 505                         return PTR_ERR(host->hv_regs);
 506
 507                 if (host->info->has_common) {
 508                         host->common_regs = devm_platform_ioremap_resource_byname(pdev, "common");
 509                         if (IS_ERR(host->common_regs))
 510                                 return PTR_ERR(host->common_regs);
 511                 }
 512         } else {
 513                 host->regs = devm_platform_ioremap_resource(pdev, 0);
 514                 if (IS_ERR(host->regs))
 515                         return PTR_ERR(host->regs);
 516         }
 517
 518         host->syncpt_irq = platform_get_irq(pdev, 0);
 519         if (host->syncpt_irq < 0)
 520                 return host->syncpt_irq;
 521
 522         mutex_init(&host->devices_lock);
 523         INIT_LIST_HEAD(&host->devices);
 524         INIT_LIST_HEAD(&host->list);
 525         host->dev = &pdev->dev;
 526
 527         /* set common host1x device data */
 528         platform_set_drvdata(pdev, host);
 529
 530         host->dev->dma_parms = &host->dma_parms;
 531         dma_set_max_seg_size(host->dev, UINT_MAX);
 532
 533         if (host->info->init) {
 534                 err = host->info->init(host);
 535                 if (err)
 536                         return err;
 537         }
 538
 539         host->clk = devm_clk_get(&pdev->dev, NULL);
 540         if (IS_ERR(host->clk)) {
 541                 err = PTR_ERR(host->clk);
 542
 543                 if (err != -EPROBE_DEFER)
 544                         dev_err(&pdev->dev, "failed to get clock: %d\n", err);
 545
 546                 return err;
 547         }
 548
 549         err = host1x_get_resets(host);
 550         if (err)
 551                 return err;
 552
 553         host1x_bo_cache_init(&host->cache);
 554
 555         err = host1x_iommu_init(host);
 556         if (err < 0) {
 557                 dev_err(&pdev->dev, "failed to setup IOMMU: %d\n", err);
 558                 goto destroy_cache;
 559         }
 560
 561         err = host1x_channel_list_init(&host->channel_list,
 562                                        host->info->nb_channels);
 563         if (err) {
 564                 dev_err(&pdev->dev, "failed to initialize channel list\n");
 565                 goto iommu_exit;
 566         }
 567
 568         err = host1x_memory_context_list_init(host);
 569         if (err) {
 570                 dev_err(&pdev->dev, "failed to initialize context list\n");
 571                 goto free_channels;
 572         }
 573
 574         err = host1x_syncpt_init(host);
 575         if (err) {
 576                 dev_err(&pdev->dev, "failed to initialize syncpts\n");
 577                 goto free_contexts;
 578         }
 579
 580         err = host1x_intr_init(host);
 581         if (err) {
 582                 dev_err(&pdev->dev, "failed to initialize interrupts\n");
 583                 goto deinit_syncpt;
 584         }
 585
 586         pm_runtime_enable(&pdev->dev);
 587
 588         err = devm_tegra_core_dev_init_opp_table_common(&pdev->dev);
 589         if (err)
 590                 goto pm_disable;
 591
 592         /* the driver's code isn't ready yet for the dynamic RPM */
 593         err = pm_runtime_resume_and_get(&pdev->dev);
 594         if (err)
 595                 goto pm_disable;
 596
 597         host1x_debug_init(host);
 598
 599         err = host1x_register(host);
 600         if (err < 0)
 601                 goto deinit_debugfs;
 602
 603         err = devm_of_platform_populate(&pdev->dev);
 604         if (err < 0)
 605                 goto unregister;
 606
 607         return 0;
 608
 609 unregister:
 610         host1x_unregister(host);
 611 deinit_debugfs:
 612         host1x_debug_deinit(host);
 613
 614         pm_runtime_put_sync_suspend(&pdev->dev);
 615 pm_disable:
 616         pm_runtime_disable(&pdev->dev);
 617
 618         host1x_intr_deinit(host);
 619 deinit_syncpt:
 620         host1x_syncpt_deinit(host);
 621 free_contexts:
 622         host1x_memory_context_list_free(&host->context_list);
 623 free_channels:
 624         host1x_channel_list_free(&host->channel_list);
 625 iommu_exit:
 626         host1x_iommu_exit(host);
 627 destroy_cache:
 628         host1x_bo_cache_destroy(&host->cache);
 629
 630         return err;
 631 }
 632
 633 static int host1x_remove(struct platform_device *pdev)
 634 {
 635         struct host1x *host = platform_get_drvdata(pdev);
 636
 637         host1x_unregister(host);
 638         host1x_debug_deinit(host);
 639
 640         pm_runtime_force_suspend(&pdev->dev);
 641
 642         host1x_intr_deinit(host);
 643         host1x_syncpt_deinit(host);
 644         host1x_memory_context_list_free(&host->context_list);
 645         host1x_channel_list_free(&host->channel_list);
 646         host1x_iommu_exit(host);
 647         host1x_bo_cache_destroy(&host->cache);
 648
 649         return 0;
 650 }
 651
 652 static int __maybe_unused host1x_runtime_suspend(struct device *dev)
 653 {
 654         struct host1x *host = dev_get_drvdata(dev);
 655         int err;
 656
 657         host1x_intr_stop(host);
 658         host1x_syncpt_save(host);
 659
 660         err = reset_control_bulk_assert(host->nresets, host->resets);
 661         if (err) {
 662                 dev_err(dev, "failed to assert reset: %d\n", err);
 663                 goto resume_host1x;
 664         }
 665
 666         usleep_range(1000, 2000);
 667
 668         clk_disable_unprepare(host->clk);
 669         reset_control_bulk_release(host->nresets, host->resets);
 670
 671         return 0;
 672
 673 resume_host1x:
 674         host1x_setup_virtualization_tables(host);
 675         host1x_syncpt_restore(host);
 676         host1x_intr_start(host);
 677
 678         return err;
 679 }
 680
 681 static int __maybe_unused host1x_runtime_resume(struct device *dev)
 682 {
 683         struct host1x *host = dev_get_drvdata(dev);
 684         int err;
 685
 686         err = reset_control_bulk_acquire(host->nresets, host->resets);
 687         if (err) {
 688                 dev_err(dev, "failed to acquire reset: %d\n", err);
 689                 return err;
 690         }
 691
 692         err = clk_prepare_enable(host->clk);
 693         if (err) {
 694                 dev_err(dev, "failed to enable clock: %d\n", err);
 695                 goto release_reset;
 696         }
 697
 698         err = reset_control_bulk_deassert(host->nresets, host->resets);
 699         if (err < 0) {
 700                 dev_err(dev, "failed to deassert reset: %d\n", err);
 701                 goto disable_clk;
 702         }
 703
 704         host1x_setup_virtualization_tables(host);
 705         host1x_syncpt_restore(host);
 706         host1x_intr_start(host);
 707
 708         return 0;
 709
 710 disable_clk:
 711         clk_disable_unprepare(host->clk);
 712 release_reset:
 713         reset_control_bulk_release(host->nresets, host->resets);
 714
 715         return err;
 716 }
 717
 718 static const struct dev_pm_ops host1x_pm_ops = {
 719         SET_RUNTIME_PM_OPS(host1x_runtime_suspend, host1x_runtime_resume,
 720                            NULL)
 721         /* TODO: add system suspend-resume once driver will be ready for that */
 722 };
 723
 724 static struct platform_driver tegra_host1x_driver = {
 725         .driver = {
 726                 .name = "tegra-host1x",
 727                 .of_match_table = host1x_of_match,
 728                 .pm = &host1x_pm_ops,
 729         },
 730         .probe = host1x_probe,
 731         .remove = host1x_remove,
 732 };
 733
 734 static struct platform_driver * const drivers[] = {
 735         &tegra_host1x_driver,
 736         &tegra_mipi_driver,
 737 };
 738
 739 static int __init tegra_host1x_init(void)
 740 {
 741         int err;
 742
 743         err = bus_register(&host1x_bus_type);
 744         if (err < 0)
 745                 return err;
 746
 747         err = platform_register_drivers(drivers, ARRAY_SIZE(drivers));
 748         if (err < 0)
 749                 bus_unregister(&host1x_bus_type);
 750
 751         return err;
 752 }
 753 module_init(tegra_host1x_init);
 754
 755 static void __exit tegra_host1x_exit(void)
 756 {
 757         platform_unregister_drivers(drivers, ARRAY_SIZE(drivers));
 758         bus_unregister(&host1x_bus_type);
 759 }
 760 module_exit(tegra_host1x_exit);
 761
 762 /**
 763  * host1x_get_dma_mask() - query the supported DMA mask for host1x
 764  * @host1x: host1x instance
 765  *
 766  * Note that this returns the supported DMA mask for host1x, which can be
 767  * different from the applicable DMA mask under certain circumstances.
 768  */
 769 u64 host1x_get_dma_mask(struct host1x *host1x)
 770 {
 771         return host1x->info->dma_mask;
 772 }
 773 EXPORT_SYMBOL(host1x_get_dma_mask);
 774
 775 MODULE_AUTHOR("Thierry Reding <[email protected]>");
 776 MODULE_AUTHOR("Terje Bergstrom <[email protected]>");
 777 MODULE_DESCRIPTION("Host1x driver for Tegra products");
 778 MODULE_LICENSE("GPL");