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 };
  81
  82 static const struct host1x_info host1x02_info = {
  83         .nb_channels = 9,
  84         .nb_pts = 32,
  85         .nb_mlocks = 16,
  86         .nb_bases = 12,
  87         .init = host1x02_init,
  88         .sync_offset = 0x3000,
  89         .dma_mask = DMA_BIT_MASK(32),
  90         .has_wide_gather = false,
  91         .has_hypervisor = false,
  92         .num_sid_entries = 0,
  93         .sid_table = NULL,
  94 };
  95
  96 static const struct host1x_info host1x04_info = {
  97         .nb_channels = 12,
  98         .nb_pts = 192,
  99         .nb_mlocks = 16,
 100         .nb_bases = 64,
 101         .init = host1x04_init,
 102         .sync_offset = 0x2100,
 103         .dma_mask = DMA_BIT_MASK(34),
 104         .has_wide_gather = false,
 105         .has_hypervisor = false,
 106         .num_sid_entries = 0,
 107         .sid_table = NULL,
 108 };
 109
 110 static const struct host1x_info host1x05_info = {
 111         .nb_channels = 14,
 112         .nb_pts = 192,
 113         .nb_mlocks = 16,
 114         .nb_bases = 64,
 115         .init = host1x05_init,
 116         .sync_offset = 0x2100,
 117         .dma_mask = DMA_BIT_MASK(34),
 118         .has_wide_gather = false,
 119         .has_hypervisor = false,
 120         .num_sid_entries = 0,
 121         .sid_table = NULL,
 122 };
 123
 124 static const struct host1x_sid_entry tegra186_sid_table[] = {
 125         {
 126                 /* VIC */
 127                 .base = 0x1af0,
 128                 .offset = 0x30,
 129                 .limit = 0x34
 130         },
 131 };
 132
 133 static const struct host1x_info host1x06_info = {
 134         .nb_channels = 63,
 135         .nb_pts = 576,
 136         .nb_mlocks = 24,
 137         .nb_bases = 16,
 138         .init = host1x06_init,
 139         .sync_offset = 0x0,
 140         .dma_mask = DMA_BIT_MASK(40),
 141         .has_wide_gather = true,
 142         .has_hypervisor = true,
 143         .num_sid_entries = ARRAY_SIZE(tegra186_sid_table),
 144         .sid_table = tegra186_sid_table,
 145 };
 146
 147 static const struct host1x_sid_entry tegra194_sid_table[] = {
 148         {
 149                 /* VIC */
 150                 .base = 0x1af0,
 151                 .offset = 0x30,
 152                 .limit = 0x34
 153         },
 154 };
 155
 156 static const struct host1x_info host1x07_info = {
 157         .nb_channels = 63,
 158         .nb_pts = 704,
 159         .nb_mlocks = 32,
 160         .nb_bases = 0,
 161         .init = host1x07_init,
 162         .sync_offset = 0x0,
 163         .dma_mask = DMA_BIT_MASK(40),
 164         .has_wide_gather = true,
 165         .has_hypervisor = true,
 166         .num_sid_entries = ARRAY_SIZE(tegra194_sid_table),
 167         .sid_table = tegra194_sid_table,
 168 };
 169
 170 static const struct of_device_id host1x_of_match[] = {
 171         { .compatible = "nvidia,tegra194-host1x", .data = &host1x07_info, },
 172         { .compatible = "nvidia,tegra186-host1x", .data = &host1x06_info, },
 173         { .compatible = "nvidia,tegra210-host1x", .data = &host1x05_info, },
 174         { .compatible = "nvidia,tegra124-host1x", .data = &host1x04_info, },
 175         { .compatible = "nvidia,tegra114-host1x", .data = &host1x02_info, },
 176         { .compatible = "nvidia,tegra30-host1x", .data = &host1x01_info, },
 177         { .compatible = "nvidia,tegra20-host1x", .data = &host1x01_info, },
 178         { },
 179 };
 180 MODULE_DEVICE_TABLE(of, host1x_of_match);
 181
 182 static void host1x_setup_sid_table(struct host1x *host)
 183 {
 184         const struct host1x_info *info = host->info;
 185         unsigned int i;
 186
 187         for (i = 0; i < info->num_sid_entries; i++) {
 188                 const struct host1x_sid_entry *entry = &info->sid_table[i];
 189
 190                 host1x_hypervisor_writel(host, entry->offset, entry->base);
 191                 host1x_hypervisor_writel(host, entry->limit, entry->base + 4);
 192         }
 193 }
 194
 195 static bool host1x_wants_iommu(struct host1x *host1x)
 196 {
 197         /*
 198          * If we support addressing a maximum of 32 bits of physical memory
 199          * and if the host1x firewall is enabled, there's no need to enable
 200          * IOMMU support. This can happen for example on Tegra20, Tegra30
 201          * and Tegra114.
 202          *
 203          * Tegra124 and later can address up to 34 bits of physical memory and
 204          * many platforms come equipped with more than 2 GiB of system memory,
 205          * which requires crossing the 4 GiB boundary. But there's a catch: on
 206          * SoCs before Tegra186 (i.e. Tegra124 and Tegra210), the host1x can
 207          * only address up to 32 bits of memory in GATHER opcodes, which means
 208          * that command buffers need to either be in the first 2 GiB of system
 209          * memory (which could quickly lead to memory exhaustion), or command
 210          * buffers need to be treated differently from other buffers (which is
 211          * not possible with the current ABI).
 212          *
 213          * A third option is to use the IOMMU in these cases to make sure all
 214          * buffers will be mapped into a 32-bit IOVA space that host1x can
 215          * address. This allows all of the system memory to be used and works
 216          * within the limitations of the host1x on these SoCs.
 217          *
 218          * In summary, default to enable IOMMU on Tegra124 and later. For any
 219          * of the earlier SoCs, only use the IOMMU for additional safety when
 220          * the host1x firewall is disabled.
 221          */
 222         if (host1x->info->dma_mask <= DMA_BIT_MASK(32)) {
 223                 if (IS_ENABLED(CONFIG_TEGRA_HOST1X_FIREWALL))
 224                         return false;
 225         }
 226
 227         return true;
 228 }
 229
 230 static struct iommu_domain *host1x_iommu_attach(struct host1x *host)
 231 {
 232         struct iommu_domain *domain = iommu_get_domain_for_dev(host->dev);
 233         int err;
 234
 235         /*
 236          * We may not always want to enable IOMMU support (for example if the
 237          * host1x firewall is already enabled and we don't support addressing
 238          * more than 32 bits of physical memory), so check for that first.
 239          *
 240          * Similarly, if host1x is already attached to an IOMMU (via the DMA
 241          * API), don't try to attach again.
 242          */
 243         if (!host1x_wants_iommu(host) || domain)
 244                 return domain;
 245
 246         host->group = iommu_group_get(host->dev);
 247         if (host->group) {
 248                 struct iommu_domain_geometry *geometry;
 249                 dma_addr_t start, end;
 250                 unsigned long order;
 251
 252                 err = iova_cache_get();
 253                 if (err < 0)
 254                         goto put_group;
 255
 256                 host->domain = iommu_domain_alloc(&platform_bus_type);
 257                 if (!host->domain) {
 258                         err = -ENOMEM;
 259                         goto put_cache;
 260                 }
 261
 262                 err = iommu_attach_group(host->domain, host->group);
 263                 if (err) {
 264                         if (err == -ENODEV)
 265                                 err = 0;
 266
 267                         goto free_domain;
 268                 }
 269
 270                 geometry = &host->domain->geometry;
 271                 start = geometry->aperture_start & host->info->dma_mask;
 272                 end = geometry->aperture_end & host->info->dma_mask;
 273
 274                 order = __ffs(host->domain->pgsize_bitmap);
 275                 init_iova_domain(&host->iova, 1UL << order, start >> order);
 276                 host->iova_end = end;
 277
 278                 domain = host->domain;
 279         }
 280
 281         return domain;
 282
 283 free_domain:
 284         iommu_domain_free(host->domain);
 285         host->domain = NULL;
 286 put_cache:
 287         iova_cache_put();
 288 put_group:
 289         iommu_group_put(host->group);
 290         host->group = NULL;
 291
 292         return ERR_PTR(err);
 293 }
 294
 295 static int host1x_iommu_init(struct host1x *host)
 296 {
 297         u64 mask = host->info->dma_mask;
 298         struct iommu_domain *domain;
 299         int err;
 300
 301         domain = host1x_iommu_attach(host);
 302         if (IS_ERR(domain)) {
 303                 err = PTR_ERR(domain);
 304                 dev_err(host->dev, "failed to attach to IOMMU: %d\n", err);
 305                 return err;
 306         }
 307
 308         /*
 309          * If we're not behind an IOMMU make sure we don't get push buffers
 310          * that are allocated outside of the range addressable by the GATHER
 311          * opcode.
 312          *
 313          * Newer generations of Tegra (Tegra186 and later) support a wide
 314          * variant of the GATHER opcode that allows addressing more bits.
 315          */
 316         if (!domain && !host->info->has_wide_gather)
 317                 mask = DMA_BIT_MASK(32);
 318
 319         err = dma_coerce_mask_and_coherent(host->dev, mask);
 320         if (err < 0) {
 321                 dev_err(host->dev, "failed to set DMA mask: %d\n", err);
 322                 return err;
 323         }
 324
 325         return 0;
 326 }
 327
 328 static void host1x_iommu_exit(struct host1x *host)
 329 {
 330         if (host->domain) {
 331                 put_iova_domain(&host->iova);
 332                 iommu_detach_group(host->domain, host->group);
 333
 334                 iommu_domain_free(host->domain);
 335                 host->domain = NULL;
 336
 337                 iova_cache_put();
 338
 339                 iommu_group_put(host->group);
 340                 host->group = NULL;
 341         }
 342 }
 343
 344 static int host1x_probe(struct platform_device *pdev)
 345 {
 346         struct host1x *host;
 347         struct resource *regs, *hv_regs = NULL;
 348         int syncpt_irq;
 349         int err;
 350
 351         host = devm_kzalloc(&pdev->dev, sizeof(*host), GFP_KERNEL);
 352         if (!host)
 353                 return -ENOMEM;
 354
 355         host->info = of_device_get_match_data(&pdev->dev);
 356
 357         if (host->info->has_hypervisor) {
 358                 regs = platform_get_resource_byname(pdev, IORESOURCE_MEM, "vm");
 359                 if (!regs) {
 360                         dev_err(&pdev->dev, "failed to get vm registers\n");
 361                         return -ENXIO;
 362                 }
 363
 364                 hv_regs = platform_get_resource_byname(pdev, IORESOURCE_MEM,
 365                                                        "hypervisor");
 366                 if (!hv_regs) {
 367                         dev_err(&pdev->dev,
 368                                 "failed to get hypervisor registers\n");
 369                         return -ENXIO;
 370                 }
 371         } else {
 372                 regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 373                 if (!regs) {
 374                         dev_err(&pdev->dev, "failed to get registers\n");
 375                         return -ENXIO;
 376                 }
 377         }
 378
 379         syncpt_irq = platform_get_irq(pdev, 0);
 380         if (syncpt_irq < 0)
 381                 return syncpt_irq;
 382
 383         mutex_init(&host->devices_lock);
 384         INIT_LIST_HEAD(&host->devices);
 385         INIT_LIST_HEAD(&host->list);
 386         host->dev = &pdev->dev;
 387
 388         /* set common host1x device data */
 389         platform_set_drvdata(pdev, host);
 390
 391         host->regs = devm_ioremap_resource(&pdev->dev, regs);
 392         if (IS_ERR(host->regs))
 393                 return PTR_ERR(host->regs);
 394
 395         if (host->info->has_hypervisor) {
 396                 host->hv_regs = devm_ioremap_resource(&pdev->dev, hv_regs);
 397                 if (IS_ERR(host->hv_regs))
 398                         return PTR_ERR(host->hv_regs);
 399         }
 400
 401         host->dev->dma_parms = &host->dma_parms;
 402         dma_set_max_seg_size(host->dev, UINT_MAX);
 403
 404         if (host->info->init) {
 405                 err = host->info->init(host);
 406                 if (err)
 407                         return err;
 408         }
 409
 410         host->clk = devm_clk_get(&pdev->dev, NULL);
 411         if (IS_ERR(host->clk)) {
 412                 err = PTR_ERR(host->clk);
 413
 414                 if (err != -EPROBE_DEFER)
 415                         dev_err(&pdev->dev, "failed to get clock: %d\n", err);
 416
 417                 return err;
 418         }
 419
 420         host->rst = devm_reset_control_get(&pdev->dev, "host1x");
 421         if (IS_ERR(host->rst)) {
 422                 err = PTR_ERR(host->rst);
 423                 dev_err(&pdev->dev, "failed to get reset: %d\n", err);
 424                 return err;
 425         }
 426
 427         err = host1x_iommu_init(host);
 428         if (err < 0) {
 429                 dev_err(&pdev->dev, "failed to setup IOMMU: %d\n", err);
 430                 return err;
 431         }
 432
 433         err = host1x_channel_list_init(&host->channel_list,
 434                                        host->info->nb_channels);
 435         if (err) {
 436                 dev_err(&pdev->dev, "failed to initialize channel list\n");
 437                 goto iommu_exit;
 438         }
 439
 440         err = clk_prepare_enable(host->clk);
 441         if (err < 0) {
 442                 dev_err(&pdev->dev, "failed to enable clock\n");
 443                 goto free_channels;
 444         }
 445
 446         err = reset_control_deassert(host->rst);
 447         if (err < 0) {
 448                 dev_err(&pdev->dev, "failed to deassert reset: %d\n", err);
 449                 goto unprepare_disable;
 450         }
 451
 452         err = host1x_syncpt_init(host);
 453         if (err) {
 454                 dev_err(&pdev->dev, "failed to initialize syncpts\n");
 455                 goto reset_assert;
 456         }
 457
 458         err = host1x_intr_init(host, syncpt_irq);
 459         if (err) {
 460                 dev_err(&pdev->dev, "failed to initialize interrupts\n");
 461                 goto deinit_syncpt;
 462         }
 463
 464         host1x_debug_init(host);
 465
 466         if (host->info->has_hypervisor)
 467                 host1x_setup_sid_table(host);
 468
 469         err = host1x_register(host);
 470         if (err < 0)
 471                 goto deinit_debugfs;
 472
 473         err = devm_of_platform_populate(&pdev->dev);
 474         if (err < 0)
 475                 goto unregister;
 476
 477         return 0;
 478
 479 unregister:
 480         host1x_unregister(host);
 481 deinit_debugfs:
 482         host1x_debug_deinit(host);
 483         host1x_intr_deinit(host);
 484 deinit_syncpt:
 485         host1x_syncpt_deinit(host);
 486 reset_assert:
 487         reset_control_assert(host->rst);
 488 unprepare_disable:
 489         clk_disable_unprepare(host->clk);
 490 free_channels:
 491         host1x_channel_list_free(&host->channel_list);
 492 iommu_exit:
 493         host1x_iommu_exit(host);
 494
 495         return err;
 496 }
 497
 498 static int host1x_remove(struct platform_device *pdev)
 499 {
 500         struct host1x *host = platform_get_drvdata(pdev);
 501
 502         host1x_unregister(host);
 503         host1x_debug_deinit(host);
 504         host1x_intr_deinit(host);
 505         host1x_syncpt_deinit(host);
 506         reset_control_assert(host->rst);
 507         clk_disable_unprepare(host->clk);
 508         host1x_iommu_exit(host);
 509
 510         return 0;
 511 }
 512
 513 static struct platform_driver tegra_host1x_driver = {
 514         .driver = {
 515                 .name = "tegra-host1x",
 516                 .of_match_table = host1x_of_match,
 517         },
 518         .probe = host1x_probe,
 519         .remove = host1x_remove,
 520 };
 521
 522 static struct platform_driver * const drivers[] = {
 523         &tegra_host1x_driver,
 524         &tegra_mipi_driver,
 525 };
 526
 527 static int __init tegra_host1x_init(void)
 528 {
 529         int err;
 530
 531         err = bus_register(&host1x_bus_type);
 532         if (err < 0)
 533                 return err;
 534
 535         err = platform_register_drivers(drivers, ARRAY_SIZE(drivers));
 536         if (err < 0)
 537                 bus_unregister(&host1x_bus_type);
 538
 539         return err;
 540 }
 541 module_init(tegra_host1x_init);
 542
 543 static void __exit tegra_host1x_exit(void)
 544 {
 545         platform_unregister_drivers(drivers, ARRAY_SIZE(drivers));
 546         bus_unregister(&host1x_bus_type);
 547 }
 548 module_exit(tegra_host1x_exit);
 549
 550 /**
 551  * host1x_get_dma_mask() - query the supported DMA mask for host1x
 552  * @host1x: host1x instance
 553  *
 554  * Note that this returns the supported DMA mask for host1x, which can be
 555  * different from the applicable DMA mask under certain circumstances.
 556  */
 557 u64 host1x_get_dma_mask(struct host1x *host1x)
 558 {
 559         return host1x->info->dma_mask;
 560 }
 561 EXPORT_SYMBOL(host1x_get_dma_mask);
 562
 563 MODULE_AUTHOR("Thierry Reding <[email protected]>");
 564 MODULE_AUTHOR("Terje Bergstrom <[email protected]>");
 565 MODULE_DESCRIPTION("Host1x driver for Tegra products");
 566 MODULE_LICENSE("GPL");