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/dma-mapping.h>
  10 #include <linux/io.h>
  11 #include <linux/list.h>
  12 #include <linux/module.h>
  13 #include <linux/of_device.h>
  14 #include <linux/of.h>
  15 #include <linux/slab.h>
  16
  17 #define CREATE_TRACE_POINTS
  18 #include <trace/events/host1x.h>
  19 #undef CREATE_TRACE_POINTS
  20
  21 #include "bus.h"
  22 #include "channel.h"
  23 #include "debug.h"
  24 #include "dev.h"
  25 #include "intr.h"
  26
  27 #include "hw/host1x01.h"
  28 #include "hw/host1x02.h"
  29 #include "hw/host1x04.h"
  30 #include "hw/host1x05.h"
  31 #include "hw/host1x06.h"
  32 #include "hw/host1x07.h"
  33
  34 void host1x_hypervisor_writel(struct host1x *host1x, u32 v, u32 r)
  35 {
  36         writel(v, host1x->hv_regs + r);
  37 }
  38
  39 u32 host1x_hypervisor_readl(struct host1x *host1x, u32 r)
  40 {
  41         return readl(host1x->hv_regs + r);
  42 }
  43
  44 void host1x_sync_writel(struct host1x *host1x, u32 v, u32 r)
  45 {
  46         void __iomem *sync_regs = host1x->regs + host1x->info->sync_offset;
  47
  48         writel(v, sync_regs + r);
  49 }
  50
  51 u32 host1x_sync_readl(struct host1x *host1x, u32 r)
  52 {
  53         void __iomem *sync_regs = host1x->regs + host1x->info->sync_offset;
  54
  55         return readl(sync_regs + r);
  56 }
  57
  58 void host1x_ch_writel(struct host1x_channel *ch, u32 v, u32 r)
  59 {
  60         writel(v, ch->regs + r);
  61 }
  62
  63 u32 host1x_ch_readl(struct host1x_channel *ch, u32 r)
  64 {
  65         return readl(ch->regs + r);
  66 }
  67
  68 static const struct host1x_info host1x01_info = {
  69         .nb_channels = 8,
  70         .nb_pts = 32,
  71         .nb_mlocks = 16,
  72         .nb_bases = 8,
  73         .init = host1x01_init,
  74         .sync_offset = 0x3000,
  75         .dma_mask = DMA_BIT_MASK(32),
  76         .has_wide_gather = false,
  77         .has_hypervisor = false,
  78         .num_sid_entries = 0,
  79         .sid_table = NULL,
  80         .reserve_vblank_syncpts = true,
  81 };
  82
  83 static const struct host1x_info host1x02_info = {
  84         .nb_channels = 9,
  85         .nb_pts = 32,
  86         .nb_mlocks = 16,
  87         .nb_bases = 12,
  88         .init = host1x02_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 host1x04_info = {
  99         .nb_channels = 12,
 100         .nb_pts = 192,
 101         .nb_mlocks = 16,
 102         .nb_bases = 64,
 103         .init = host1x04_init,
 104         .sync_offset = 0x2100,
 105         .dma_mask = DMA_BIT_MASK(34),
 106         .has_wide_gather = false,
 107         .has_hypervisor = false,
 108         .num_sid_entries = 0,
 109         .sid_table = NULL,
 110         .reserve_vblank_syncpts = false,
 111 };
 112
 113 static const struct host1x_info host1x05_info = {
 114         .nb_channels = 14,
 115         .nb_pts = 192,
 116         .nb_mlocks = 16,
 117         .nb_bases = 64,
 118         .init = host1x05_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_sid_entry tegra186_sid_table[] = {
 129         {
 130                 /* VIC */
 131                 .base = 0x1af0,
 132                 .offset = 0x30,
 133                 .limit = 0x34
 134         },
 135 };
 136
 137 static const struct host1x_info host1x06_info = {
 138         .nb_channels = 63,
 139         .nb_pts = 576,
 140         .nb_mlocks = 24,
 141         .nb_bases = 16,
 142         .init = host1x06_init,
 143         .sync_offset = 0x0,
 144         .dma_mask = DMA_BIT_MASK(40),
 145         .has_wide_gather = true,
 146         .has_hypervisor = true,
 147         .num_sid_entries = ARRAY_SIZE(tegra186_sid_table),
 148         .sid_table = tegra186_sid_table,
 149         .reserve_vblank_syncpts = false,
 150 };
 151
 152 static const struct host1x_sid_entry tegra194_sid_table[] = {
 153         {
 154                 /* VIC */
 155                 .base = 0x1af0,
 156                 .offset = 0x30,
 157                 .limit = 0x34
 158         },
 159 };
 160
 161 static const struct host1x_info host1x07_info = {
 162         .nb_channels = 63,
 163         .nb_pts = 704,
 164         .nb_mlocks = 32,
 165         .nb_bases = 0,
 166         .init = host1x07_init,
 167         .sync_offset = 0x0,
 168         .dma_mask = DMA_BIT_MASK(40),
 169         .has_wide_gather = true,
 170         .has_hypervisor = true,
 171         .num_sid_entries = ARRAY_SIZE(tegra194_sid_table),
 172         .sid_table = tegra194_sid_table,
 173         .reserve_vblank_syncpts = false,
 174 };
 175
 176 static const struct of_device_id host1x_of_match[] = {
 177         { .compatible = "nvidia,tegra194-host1x", .data = &host1x07_info, },
 178         { .compatible = "nvidia,tegra186-host1x", .data = &host1x06_info, },
 179         { .compatible = "nvidia,tegra210-host1x", .data = &host1x05_info, },
 180         { .compatible = "nvidia,tegra124-host1x", .data = &host1x04_info, },
 181         { .compatible = "nvidia,tegra114-host1x", .data = &host1x02_info, },
 182         { .compatible = "nvidia,tegra30-host1x", .data = &host1x01_info, },
 183         { .compatible = "nvidia,tegra20-host1x", .data = &host1x01_info, },
 184         { },
 185 };
 186 MODULE_DEVICE_TABLE(of, host1x_of_match);
 187
 188 static void host1x_setup_sid_table(struct host1x *host)
 189 {
 190         const struct host1x_info *info = host->info;
 191         unsigned int i;
 192
 193         for (i = 0; i < info->num_sid_entries; i++) {
 194                 const struct host1x_sid_entry *entry = &info->sid_table[i];
 195
 196                 host1x_hypervisor_writel(host, entry->offset, entry->base);
 197                 host1x_hypervisor_writel(host, entry->limit, entry->base + 4);
 198         }
 199 }
 200
 201 static bool host1x_wants_iommu(struct host1x *host1x)
 202 {
 203         /*
 204          * If we support addressing a maximum of 32 bits of physical memory
 205          * and if the host1x firewall is enabled, there's no need to enable
 206          * IOMMU support. This can happen for example on Tegra20, Tegra30
 207          * and Tegra114.
 208          *
 209          * Tegra124 and later can address up to 34 bits of physical memory and
 210          * many platforms come equipped with more than 2 GiB of system memory,
 211          * which requires crossing the 4 GiB boundary. But there's a catch: on
 212          * SoCs before Tegra186 (i.e. Tegra124 and Tegra210), the host1x can
 213          * only address up to 32 bits of memory in GATHER opcodes, which means
 214          * that command buffers need to either be in the first 2 GiB of system
 215          * memory (which could quickly lead to memory exhaustion), or command
 216          * buffers need to be treated differently from other buffers (which is
 217          * not possible with the current ABI).
 218          *
 219          * A third option is to use the IOMMU in these cases to make sure all
 220          * buffers will be mapped into a 32-bit IOVA space that host1x can
 221          * address. This allows all of the system memory to be used and works
 222          * within the limitations of the host1x on these SoCs.
 223          *
 224          * In summary, default to enable IOMMU on Tegra124 and later. For any
 225          * of the earlier SoCs, only use the IOMMU for additional safety when
 226          * the host1x firewall is disabled.
 227          */
 228         if (host1x->info->dma_mask <= DMA_BIT_MASK(32)) {
 229                 if (IS_ENABLED(CONFIG_TEGRA_HOST1X_FIREWALL))
 230                         return false;
 231         }
 232
 233         return true;
 234 }
 235
 236 static struct iommu_domain *host1x_iommu_attach(struct host1x *host)
 237 {
 238         struct iommu_domain *domain = iommu_get_domain_for_dev(host->dev);
 239         int err;
 240
 241         /*
 242          * We may not always want to enable IOMMU support (for example if the
 243          * host1x firewall is already enabled and we don't support addressing
 244          * more than 32 bits of physical memory), so check for that first.
 245          *
 246          * Similarly, if host1x is already attached to an IOMMU (via the DMA
 247          * API), don't try to attach again.
 248          */
 249         if (!host1x_wants_iommu(host) || domain)
 250                 return domain;
 251
 252         host->group = iommu_group_get(host->dev);
 253         if (host->group) {
 254                 struct iommu_domain_geometry *geometry;
 255                 dma_addr_t start, end;
 256                 unsigned long order;
 257
 258                 err = iova_cache_get();
 259                 if (err < 0)
 260                         goto put_group;
 261
 262                 host->domain = iommu_domain_alloc(&platform_bus_type);
 263                 if (!host->domain) {
 264                         err = -ENOMEM;
 265                         goto put_cache;
 266                 }
 267
 268                 err = iommu_attach_group(host->domain, host->group);
 269                 if (err) {
 270                         if (err == -ENODEV)
 271                                 err = 0;
 272
 273                         goto free_domain;
 274                 }
 275
 276                 geometry = &host->domain->geometry;
 277                 start = geometry->aperture_start & host->info->dma_mask;
 278                 end = geometry->aperture_end & host->info->dma_mask;
 279
 280                 order = __ffs(host->domain->pgsize_bitmap);
 281                 init_iova_domain(&host->iova, 1UL << order, start >> order);
 282                 host->iova_end = end;
 283
 284                 domain = host->domain;
 285         }
 286
 287         return domain;
 288
 289 free_domain:
 290         iommu_domain_free(host->domain);
 291         host->domain = NULL;
 292 put_cache:
 293         iova_cache_put();
 294 put_group:
 295         iommu_group_put(host->group);
 296         host->group = NULL;
 297
 298         return ERR_PTR(err);
 299 }
 300
 301 static int host1x_iommu_init(struct host1x *host)
 302 {
 303         u64 mask = host->info->dma_mask;
 304         struct iommu_domain *domain;
 305         int err;
 306
 307         domain = host1x_iommu_attach(host);
 308         if (IS_ERR(domain)) {
 309                 err = PTR_ERR(domain);
 310                 dev_err(host->dev, "failed to attach to IOMMU: %d\n", err);
 311                 return err;
 312         }
 313
 314         /*
 315          * If we're not behind an IOMMU make sure we don't get push buffers
 316          * that are allocated outside of the range addressable by the GATHER
 317          * opcode.
 318          *
 319          * Newer generations of Tegra (Tegra186 and later) support a wide
 320          * variant of the GATHER opcode that allows addressing more bits.
 321          */
 322         if (!domain && !host->info->has_wide_gather)
 323                 mask = DMA_BIT_MASK(32);
 324
 325         err = dma_coerce_mask_and_coherent(host->dev, mask);
 326         if (err < 0) {
 327                 dev_err(host->dev, "failed to set DMA mask: %d\n", err);
 328                 return err;
 329         }
 330
 331         return 0;
 332 }
 333
 334 static void host1x_iommu_exit(struct host1x *host)
 335 {
 336         if (host->domain) {
 337                 put_iova_domain(&host->iova);
 338                 iommu_detach_group(host->domain, host->group);
 339
 340                 iommu_domain_free(host->domain);
 341                 host->domain = NULL;
 342
 343                 iova_cache_put();
 344
 345                 iommu_group_put(host->group);
 346                 host->group = NULL;
 347         }
 348 }
 349
 350 static int host1x_probe(struct platform_device *pdev)
 351 {
 352         struct host1x *host;
 353         struct resource *regs, *hv_regs = NULL;
 354         int syncpt_irq;
 355         int err;
 356
 357         host = devm_kzalloc(&pdev->dev, sizeof(*host), GFP_KERNEL);
 358         if (!host)
 359                 return -ENOMEM;
 360
 361         host->info = of_device_get_match_data(&pdev->dev);
 362
 363         if (host->info->has_hypervisor) {
 364                 regs = platform_get_resource_byname(pdev, IORESOURCE_MEM, "vm");
 365                 if (!regs) {
 366                         dev_err(&pdev->dev, "failed to get vm registers\n");
 367                         return -ENXIO;
 368                 }
 369
 370                 hv_regs = platform_get_resource_byname(pdev, IORESOURCE_MEM,
 371                                                        "hypervisor");
 372                 if (!hv_regs) {
 373                         dev_err(&pdev->dev,
 374                                 "failed to get hypervisor registers\n");
 375                         return -ENXIO;
 376                 }
 377         } else {
 378                 regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 379                 if (!regs) {
 380                         dev_err(&pdev->dev, "failed to get registers\n");
 381                         return -ENXIO;
 382                 }
 383         }
 384
 385         syncpt_irq = platform_get_irq(pdev, 0);
 386         if (syncpt_irq < 0)
 387                 return syncpt_irq;
 388
 389         mutex_init(&host->devices_lock);
 390         INIT_LIST_HEAD(&host->devices);
 391         INIT_LIST_HEAD(&host->list);
 392         host->dev = &pdev->dev;
 393
 394         /* set common host1x device data */
 395         platform_set_drvdata(pdev, host);
 396
 397         host->regs = devm_ioremap_resource(&pdev->dev, regs);
 398         if (IS_ERR(host->regs))
 399                 return PTR_ERR(host->regs);
 400
 401         if (host->info->has_hypervisor) {
 402                 host->hv_regs = devm_ioremap_resource(&pdev->dev, hv_regs);
 403                 if (IS_ERR(host->hv_regs))
 404                         return PTR_ERR(host->hv_regs);
 405         }
 406
 407         host->dev->dma_parms = &host->dma_parms;
 408         dma_set_max_seg_size(host->dev, UINT_MAX);
 409
 410         if (host->info->init) {
 411                 err = host->info->init(host);
 412                 if (err)
 413                         return err;
 414         }
 415
 416         host->clk = devm_clk_get(&pdev->dev, NULL);
 417         if (IS_ERR(host->clk)) {
 418                 err = PTR_ERR(host->clk);
 419
 420                 if (err != -EPROBE_DEFER)
 421                         dev_err(&pdev->dev, "failed to get clock: %d\n", err);
 422
 423                 return err;
 424         }
 425
 426         host->rst = devm_reset_control_get(&pdev->dev, "host1x");
 427         if (IS_ERR(host->rst)) {
 428                 err = PTR_ERR(host->rst);
 429                 dev_err(&pdev->dev, "failed to get reset: %d\n", err);
 430                 return err;
 431         }
 432
 433         err = host1x_iommu_init(host);
 434         if (err < 0) {
 435                 dev_err(&pdev->dev, "failed to setup IOMMU: %d\n", err);
 436                 return err;
 437         }
 438
 439         err = host1x_channel_list_init(&host->channel_list,
 440                                        host->info->nb_channels);
 441         if (err) {
 442                 dev_err(&pdev->dev, "failed to initialize channel list\n");
 443                 goto iommu_exit;
 444         }
 445
 446         err = clk_prepare_enable(host->clk);
 447         if (err < 0) {
 448                 dev_err(&pdev->dev, "failed to enable clock\n");
 449                 goto free_channels;
 450         }
 451
 452         err = reset_control_deassert(host->rst);
 453         if (err < 0) {
 454                 dev_err(&pdev->dev, "failed to deassert reset: %d\n", err);
 455                 goto unprepare_disable;
 456         }
 457
 458         err = host1x_syncpt_init(host);
 459         if (err) {
 460                 dev_err(&pdev->dev, "failed to initialize syncpts\n");
 461                 goto reset_assert;
 462         }
 463
 464         err = host1x_intr_init(host, syncpt_irq);
 465         if (err) {
 466                 dev_err(&pdev->dev, "failed to initialize interrupts\n");
 467                 goto deinit_syncpt;
 468         }
 469
 470         host1x_debug_init(host);
 471
 472         if (host->info->has_hypervisor)
 473                 host1x_setup_sid_table(host);
 474
 475         err = host1x_register(host);
 476         if (err < 0)
 477                 goto deinit_debugfs;
 478
 479         err = devm_of_platform_populate(&pdev->dev);
 480         if (err < 0)
 481                 goto unregister;
 482
 483         return 0;
 484
 485 unregister:
 486         host1x_unregister(host);
 487 deinit_debugfs:
 488         host1x_debug_deinit(host);
 489         host1x_intr_deinit(host);
 490 deinit_syncpt:
 491         host1x_syncpt_deinit(host);
 492 reset_assert:
 493         reset_control_assert(host->rst);
 494 unprepare_disable:
 495         clk_disable_unprepare(host->clk);
 496 free_channels:
 497         host1x_channel_list_free(&host->channel_list);
 498 iommu_exit:
 499         host1x_iommu_exit(host);
 500
 501         return err;
 502 }
 503
 504 static int host1x_remove(struct platform_device *pdev)
 505 {
 506         struct host1x *host = platform_get_drvdata(pdev);
 507
 508         host1x_unregister(host);
 509         host1x_debug_deinit(host);
 510         host1x_intr_deinit(host);
 511         host1x_syncpt_deinit(host);
 512         reset_control_assert(host->rst);
 513         clk_disable_unprepare(host->clk);
 514         host1x_iommu_exit(host);
 515
 516         return 0;
 517 }
 518
 519 static struct platform_driver tegra_host1x_driver = {
 520         .driver = {
 521                 .name = "tegra-host1x",
 522                 .of_match_table = host1x_of_match,
 523         },
 524         .probe = host1x_probe,
 525         .remove = host1x_remove,
 526 };
 527
 528 static struct platform_driver * const drivers[] = {
 529         &tegra_host1x_driver,
 530         &tegra_mipi_driver,
 531 };
 532
 533 static int __init tegra_host1x_init(void)
 534 {
 535         int err;
 536
 537         err = bus_register(&host1x_bus_type);
 538         if (err < 0)
 539                 return err;
 540
 541         err = platform_register_drivers(drivers, ARRAY_SIZE(drivers));
 542         if (err < 0)
 543                 bus_unregister(&host1x_bus_type);
 544
 545         return err;
 546 }
 547 module_init(tegra_host1x_init);
 548
 549 static void __exit tegra_host1x_exit(void)
 550 {
 551         platform_unregister_drivers(drivers, ARRAY_SIZE(drivers));
 552         bus_unregister(&host1x_bus_type);
 553 }
 554 module_exit(tegra_host1x_exit);
 555
 556 /**
 557  * host1x_get_dma_mask() - query the supported DMA mask for host1x
 558  * @host1x: host1x instance
 559  *
 560  * Note that this returns the supported DMA mask for host1x, which can be
 561  * different from the applicable DMA mask under certain circumstances.
 562  */
 563 u64 host1x_get_dma_mask(struct host1x *host1x)
 564 {
 565         return host1x->info->dma_mask;
 566 }
 567 EXPORT_SYMBOL(host1x_get_dma_mask);
 568
 569 MODULE_AUTHOR("Thierry Reding <[email protected]>");
 570 MODULE_AUTHOR("Terje Bergstrom <[email protected]>");
 571 MODULE_DESCRIPTION("Host1x driver for Tegra products");
 572 MODULE_LICENSE("GPL");