drivers/memory/tegra/mc.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (C) 2014 NVIDIA CORPORATION.  All rights reserved.
   4  */
   5
   6 #include <linux/clk.h>
   7 #include <linux/delay.h>
   8 #include <linux/interrupt.h>
   9 #include <linux/kernel.h>
  10 #include <linux/module.h>
  11 #include <linux/of.h>
  12 #include <linux/of_device.h>
  13 #include <linux/platform_device.h>
  14 #include <linux/slab.h>
  15 #include <linux/sort.h>
  16
  17 #include <soc/tegra/fuse.h>
  18
  19 #include "mc.h"
  20
  21 #define MC_INTSTATUS 0x000
  22
  23 #define MC_INTMASK 0x004
  24
  25 #define MC_ERR_STATUS 0x08
  26 #define  MC_ERR_STATUS_TYPE_SHIFT 28
  27 #define  MC_ERR_STATUS_TYPE_INVALID_SMMU_PAGE (6 << MC_ERR_STATUS_TYPE_SHIFT)
  28 #define  MC_ERR_STATUS_TYPE_MASK (0x7 << MC_ERR_STATUS_TYPE_SHIFT)
  29 #define  MC_ERR_STATUS_READABLE (1 << 27)
  30 #define  MC_ERR_STATUS_WRITABLE (1 << 26)
  31 #define  MC_ERR_STATUS_NONSECURE (1 << 25)
  32 #define  MC_ERR_STATUS_ADR_HI_SHIFT 20
  33 #define  MC_ERR_STATUS_ADR_HI_MASK 0x3
  34 #define  MC_ERR_STATUS_SECURITY (1 << 17)
  35 #define  MC_ERR_STATUS_RW (1 << 16)
  36
  37 #define MC_ERR_ADR 0x0c
  38
  39 #define MC_GART_ERROR_REQ               0x30
  40 #define MC_DECERR_EMEM_OTHERS_STATUS    0x58
  41 #define MC_SECURITY_VIOLATION_STATUS    0x74
  42
  43 #define MC_EMEM_ARB_CFG 0x90
  44 #define  MC_EMEM_ARB_CFG_CYCLES_PER_UPDATE(x)   (((x) & 0x1ff) << 0)
  45 #define  MC_EMEM_ARB_CFG_CYCLES_PER_UPDATE_MASK 0x1ff
  46 #define MC_EMEM_ARB_MISC0 0xd8
  47
  48 #define MC_EMEM_ADR_CFG 0x54
  49 #define MC_EMEM_ADR_CFG_EMEM_NUMDEV BIT(0)
  50
  51 #define MC_TIMING_CONTROL               0xfc
  52 #define MC_TIMING_UPDATE                BIT(0)
  53
  54 static const struct of_device_id tegra_mc_of_match[] = {
  55 #ifdef CONFIG_ARCH_TEGRA_2x_SOC
  56         { .compatible = "nvidia,tegra20-mc-gart", .data = &tegra20_mc_soc },
  57 #endif
  58 #ifdef CONFIG_ARCH_TEGRA_3x_SOC
  59         { .compatible = "nvidia,tegra30-mc", .data = &tegra30_mc_soc },
  60 #endif
  61 #ifdef CONFIG_ARCH_TEGRA_114_SOC
  62         { .compatible = "nvidia,tegra114-mc", .data = &tegra114_mc_soc },
  63 #endif
  64 #ifdef CONFIG_ARCH_TEGRA_124_SOC
  65         { .compatible = "nvidia,tegra124-mc", .data = &tegra124_mc_soc },
  66 #endif
  67 #ifdef CONFIG_ARCH_TEGRA_132_SOC
  68         { .compatible = "nvidia,tegra132-mc", .data = &tegra132_mc_soc },
  69 #endif
  70 #ifdef CONFIG_ARCH_TEGRA_210_SOC
  71         { .compatible = "nvidia,tegra210-mc", .data = &tegra210_mc_soc },
  72 #endif
  73         { }
  74 };
  75 MODULE_DEVICE_TABLE(of, tegra_mc_of_match);
  76
  77 static int tegra_mc_block_dma_common(struct tegra_mc *mc,
  78                                      const struct tegra_mc_reset *rst)
  79 {
  80         unsigned long flags;
  81         u32 value;
  82
  83         spin_lock_irqsave(&mc->lock, flags);
  84
  85         value = mc_readl(mc, rst->control) | BIT(rst->bit);
  86         mc_writel(mc, value, rst->control);
  87
  88         spin_unlock_irqrestore(&mc->lock, flags);
  89
  90         return 0;
  91 }
  92
  93 static bool tegra_mc_dma_idling_common(struct tegra_mc *mc,
  94                                        const struct tegra_mc_reset *rst)
  95 {
  96         return (mc_readl(mc, rst->status) & BIT(rst->bit)) != 0;
  97 }
  98
  99 static int tegra_mc_unblock_dma_common(struct tegra_mc *mc,
 100                                        const struct tegra_mc_reset *rst)
 101 {
 102         unsigned long flags;
 103         u32 value;
 104
 105         spin_lock_irqsave(&mc->lock, flags);
 106
 107         value = mc_readl(mc, rst->control) & ~BIT(rst->bit);
 108         mc_writel(mc, value, rst->control);
 109
 110         spin_unlock_irqrestore(&mc->lock, flags);
 111
 112         return 0;
 113 }
 114
 115 static int tegra_mc_reset_status_common(struct tegra_mc *mc,
 116                                         const struct tegra_mc_reset *rst)
 117 {
 118         return (mc_readl(mc, rst->control) & BIT(rst->bit)) != 0;
 119 }
 120
 121 const struct tegra_mc_reset_ops tegra_mc_reset_ops_common = {
 122         .block_dma = tegra_mc_block_dma_common,
 123         .dma_idling = tegra_mc_dma_idling_common,
 124         .unblock_dma = tegra_mc_unblock_dma_common,
 125         .reset_status = tegra_mc_reset_status_common,
 126 };
 127
 128 static inline struct tegra_mc *reset_to_mc(struct reset_controller_dev *rcdev)
 129 {
 130         return container_of(rcdev, struct tegra_mc, reset);
 131 }
 132
 133 static const struct tegra_mc_reset *tegra_mc_reset_find(struct tegra_mc *mc,
 134                                                         unsigned long id)
 135 {
 136         unsigned int i;
 137
 138         for (i = 0; i < mc->soc->num_resets; i++)
 139                 if (mc->soc->resets[i].id == id)
 140                         return &mc->soc->resets[i];
 141
 142         return NULL;
 143 }
 144
 145 static int tegra_mc_hotreset_assert(struct reset_controller_dev *rcdev,
 146                                     unsigned long id)
 147 {
 148         struct tegra_mc *mc = reset_to_mc(rcdev);
 149         const struct tegra_mc_reset_ops *rst_ops;
 150         const struct tegra_mc_reset *rst;
 151         int retries = 500;
 152         int err;
 153
 154         rst = tegra_mc_reset_find(mc, id);
 155         if (!rst)
 156                 return -ENODEV;
 157
 158         rst_ops = mc->soc->reset_ops;
 159         if (!rst_ops)
 160                 return -ENODEV;
 161
 162         if (rst_ops->block_dma) {
 163                 /* block clients DMA requests */
 164                 err = rst_ops->block_dma(mc, rst);
 165                 if (err) {
 166                         dev_err(mc->dev, "failed to block %s DMA: %d\n",
 167                                 rst->name, err);
 168                         return err;
 169                 }
 170         }
 171
 172         if (rst_ops->dma_idling) {
 173                 /* wait for completion of the outstanding DMA requests */
 174                 while (!rst_ops->dma_idling(mc, rst)) {
 175                         if (!retries--) {
 176                                 dev_err(mc->dev, "failed to flush %s DMA\n",
 177                                         rst->name);
 178                                 return -EBUSY;
 179                         }
 180
 181                         usleep_range(10, 100);
 182                 }
 183         }
 184
 185         if (rst_ops->hotreset_assert) {
 186                 /* clear clients DMA requests sitting before arbitration */
 187                 err = rst_ops->hotreset_assert(mc, rst);
 188                 if (err) {
 189                         dev_err(mc->dev, "failed to hot reset %s: %d\n",
 190                                 rst->name, err);
 191                         return err;
 192                 }
 193         }
 194
 195         return 0;
 196 }
 197
 198 static int tegra_mc_hotreset_deassert(struct reset_controller_dev *rcdev,
 199                                       unsigned long id)
 200 {
 201         struct tegra_mc *mc = reset_to_mc(rcdev);
 202         const struct tegra_mc_reset_ops *rst_ops;
 203         const struct tegra_mc_reset *rst;
 204         int err;
 205
 206         rst = tegra_mc_reset_find(mc, id);
 207         if (!rst)
 208                 return -ENODEV;
 209
 210         rst_ops = mc->soc->reset_ops;
 211         if (!rst_ops)
 212                 return -ENODEV;
 213
 214         if (rst_ops->hotreset_deassert) {
 215                 /* take out client from hot reset */
 216                 err = rst_ops->hotreset_deassert(mc, rst);
 217                 if (err) {
 218                         dev_err(mc->dev, "failed to deassert hot reset %s: %d\n",
 219                                 rst->name, err);
 220                         return err;
 221                 }
 222         }
 223
 224         if (rst_ops->unblock_dma) {
 225                 /* allow new DMA requests to proceed to arbitration */
 226                 err = rst_ops->unblock_dma(mc, rst);
 227                 if (err) {
 228                         dev_err(mc->dev, "failed to unblock %s DMA : %d\n",
 229                                 rst->name, err);
 230                         return err;
 231                 }
 232         }
 233
 234         return 0;
 235 }
 236
 237 static int tegra_mc_hotreset_status(struct reset_controller_dev *rcdev,
 238                                     unsigned long id)
 239 {
 240         struct tegra_mc *mc = reset_to_mc(rcdev);
 241         const struct tegra_mc_reset_ops *rst_ops;
 242         const struct tegra_mc_reset *rst;
 243
 244         rst = tegra_mc_reset_find(mc, id);
 245         if (!rst)
 246                 return -ENODEV;
 247
 248         rst_ops = mc->soc->reset_ops;
 249         if (!rst_ops)
 250                 return -ENODEV;
 251
 252         return rst_ops->reset_status(mc, rst);
 253 }
 254
 255 static const struct reset_control_ops tegra_mc_reset_ops = {
 256         .assert = tegra_mc_hotreset_assert,
 257         .deassert = tegra_mc_hotreset_deassert,
 258         .status = tegra_mc_hotreset_status,
 259 };
 260
 261 static int tegra_mc_reset_setup(struct tegra_mc *mc)
 262 {
 263         int err;
 264
 265         mc->reset.ops = &tegra_mc_reset_ops;
 266         mc->reset.owner = THIS_MODULE;
 267         mc->reset.of_node = mc->dev->of_node;
 268         mc->reset.of_reset_n_cells = 1;
 269         mc->reset.nr_resets = mc->soc->num_resets;
 270
 271         err = reset_controller_register(&mc->reset);
 272         if (err < 0)
 273                 return err;
 274
 275         return 0;
 276 }
 277
 278 static int tegra_mc_setup_latency_allowance(struct tegra_mc *mc)
 279 {
 280         unsigned long long tick;
 281         unsigned int i;
 282         u32 value;
 283
 284         /* compute the number of MC clock cycles per tick */
 285         tick = (unsigned long long)mc->tick * clk_get_rate(mc->clk);
 286         do_div(tick, NSEC_PER_SEC);
 287
 288         value = mc_readl(mc, MC_EMEM_ARB_CFG);
 289         value &= ~MC_EMEM_ARB_CFG_CYCLES_PER_UPDATE_MASK;
 290         value |= MC_EMEM_ARB_CFG_CYCLES_PER_UPDATE(tick);
 291         mc_writel(mc, value, MC_EMEM_ARB_CFG);
 292
 293         /* write latency allowance defaults */
 294         for (i = 0; i < mc->soc->num_clients; i++) {
 295                 const struct tegra_mc_la *la = &mc->soc->clients[i].la;
 296                 u32 value;
 297
 298                 value = mc_readl(mc, la->reg);
 299                 value &= ~(la->mask << la->shift);
 300                 value |= (la->def & la->mask) << la->shift;
 301                 mc_writel(mc, value, la->reg);
 302         }
 303
 304         /* latch new values */
 305         mc_writel(mc, MC_TIMING_UPDATE, MC_TIMING_CONTROL);
 306
 307         return 0;
 308 }
 309
 310 void tegra_mc_write_emem_configuration(struct tegra_mc *mc, unsigned long rate)
 311 {
 312         unsigned int i;
 313         struct tegra_mc_timing *timing = NULL;
 314
 315         for (i = 0; i < mc->num_timings; i++) {
 316                 if (mc->timings[i].rate == rate) {
 317                         timing = &mc->timings[i];
 318                         break;
 319                 }
 320         }
 321
 322         if (!timing) {
 323                 dev_err(mc->dev, "no memory timing registered for rate %lu\n",
 324                         rate);
 325                 return;
 326         }
 327
 328         for (i = 0; i < mc->soc->num_emem_regs; ++i)
 329                 mc_writel(mc, timing->emem_data[i], mc->soc->emem_regs[i]);
 330 }
 331
 332 unsigned int tegra_mc_get_emem_device_count(struct tegra_mc *mc)
 333 {
 334         u8 dram_count;
 335
 336         dram_count = mc_readl(mc, MC_EMEM_ADR_CFG);
 337         dram_count &= MC_EMEM_ADR_CFG_EMEM_NUMDEV;
 338         dram_count++;
 339
 340         return dram_count;
 341 }
 342
 343 static int load_one_timing(struct tegra_mc *mc,
 344                            struct tegra_mc_timing *timing,
 345                            struct device_node *node)
 346 {
 347         int err;
 348         u32 tmp;
 349
 350         err = of_property_read_u32(node, "clock-frequency", &tmp);
 351         if (err) {
 352                 dev_err(mc->dev,
 353                         "timing %pOFn: failed to read rate\n", node);
 354                 return err;
 355         }
 356
 357         timing->rate = tmp;
 358         timing->emem_data = devm_kcalloc(mc->dev, mc->soc->num_emem_regs,
 359                                          sizeof(u32), GFP_KERNEL);
 360         if (!timing->emem_data)
 361                 return -ENOMEM;
 362
 363         err = of_property_read_u32_array(node, "nvidia,emem-configuration",
 364                                          timing->emem_data,
 365                                          mc->soc->num_emem_regs);
 366         if (err) {
 367                 dev_err(mc->dev,
 368                         "timing %pOFn: failed to read EMEM configuration\n",
 369                         node);
 370                 return err;
 371         }
 372
 373         return 0;
 374 }
 375
 376 static int load_timings(struct tegra_mc *mc, struct device_node *node)
 377 {
 378         struct device_node *child;
 379         struct tegra_mc_timing *timing;
 380         int child_count = of_get_child_count(node);
 381         int i = 0, err;
 382
 383         mc->timings = devm_kcalloc(mc->dev, child_count, sizeof(*timing),
 384                                    GFP_KERNEL);
 385         if (!mc->timings)
 386                 return -ENOMEM;
 387
 388         mc->num_timings = child_count;
 389
 390         for_each_child_of_node(node, child) {
 391                 timing = &mc->timings[i++];
 392
 393                 err = load_one_timing(mc, timing, child);
 394                 if (err) {
 395                         of_node_put(child);
 396                         return err;
 397                 }
 398         }
 399
 400         return 0;
 401 }
 402
 403 static int tegra_mc_setup_timings(struct tegra_mc *mc)
 404 {
 405         struct device_node *node;
 406         u32 ram_code, node_ram_code;
 407         int err;
 408
 409         ram_code = tegra_read_ram_code();
 410
 411         mc->num_timings = 0;
 412
 413         for_each_child_of_node(mc->dev->of_node, node) {
 414                 err = of_property_read_u32(node, "nvidia,ram-code",
 415                                            &node_ram_code);
 416                 if (err || (node_ram_code != ram_code))
 417                         continue;
 418
 419                 err = load_timings(mc, node);
 420                 of_node_put(node);
 421                 if (err)
 422                         return err;
 423                 break;
 424         }
 425
 426         if (mc->num_timings == 0)
 427                 dev_warn(mc->dev,
 428                          "no memory timings for RAM code %u registered\n",
 429                          ram_code);
 430
 431         return 0;
 432 }
 433
 434 static const char *const status_names[32] = {
 435         [ 1] = "External interrupt",
 436         [ 6] = "EMEM address decode error",
 437         [ 7] = "GART page fault",
 438         [ 8] = "Security violation",
 439         [ 9] = "EMEM arbitration error",
 440         [10] = "Page fault",
 441         [11] = "Invalid APB ASID update",
 442         [12] = "VPR violation",
 443         [13] = "Secure carveout violation",
 444         [16] = "MTS carveout violation",
 445 };
 446
 447 static const char *const error_names[8] = {
 448         [2] = "EMEM decode error",
 449         [3] = "TrustZone violation",
 450         [4] = "Carveout violation",
 451         [6] = "SMMU translation error",
 452 };
 453
 454 static irqreturn_t tegra_mc_irq(int irq, void *data)
 455 {
 456         struct tegra_mc *mc = data;
 457         unsigned long status;
 458         unsigned int bit;
 459
 460         /* mask all interrupts to avoid flooding */
 461         status = mc_readl(mc, MC_INTSTATUS) & mc->soc->intmask;
 462         if (!status)
 463                 return IRQ_NONE;
 464
 465         for_each_set_bit(bit, &status, 32) {
 466                 const char *error = status_names[bit] ?: "unknown";
 467                 const char *client = "unknown", *desc;
 468                 const char *direction, *secure;
 469                 phys_addr_t addr = 0;
 470                 unsigned int i;
 471                 char perm[7];
 472                 u8 id, type;
 473                 u32 value;
 474
 475                 value = mc_readl(mc, MC_ERR_STATUS);
 476
 477 #ifdef CONFIG_PHYS_ADDR_T_64BIT
 478                 if (mc->soc->num_address_bits > 32) {
 479                         addr = ((value >> MC_ERR_STATUS_ADR_HI_SHIFT) &
 480                                 MC_ERR_STATUS_ADR_HI_MASK);
 481                         addr <<= 32;
 482                 }
 483 #endif
 484
 485                 if (value & MC_ERR_STATUS_RW)
 486                         direction = "write";
 487                 else
 488                         direction = "read";
 489
 490                 if (value & MC_ERR_STATUS_SECURITY)
 491                         secure = "secure ";
 492                 else
 493                         secure = "";
 494
 495                 id = value & mc->soc->client_id_mask;
 496
 497                 for (i = 0; i < mc->soc->num_clients; i++) {
 498                         if (mc->soc->clients[i].id == id) {
 499                                 client = mc->soc->clients[i].name;
 500                                 break;
 501                         }
 502                 }
 503
 504                 type = (value & MC_ERR_STATUS_TYPE_MASK) >>
 505                        MC_ERR_STATUS_TYPE_SHIFT;
 506                 desc = error_names[type];
 507
 508                 switch (value & MC_ERR_STATUS_TYPE_MASK) {
 509                 case MC_ERR_STATUS_TYPE_INVALID_SMMU_PAGE:
 510                         perm[0] = ' ';
 511                         perm[1] = '[';
 512
 513                         if (value & MC_ERR_STATUS_READABLE)
 514                                 perm[2] = 'R';
 515                         else
 516                                 perm[2] = '-';
 517
 518                         if (value & MC_ERR_STATUS_WRITABLE)
 519                                 perm[3] = 'W';
 520                         else
 521                                 perm[3] = '-';
 522
 523                         if (value & MC_ERR_STATUS_NONSECURE)
 524                                 perm[4] = '-';
 525                         else
 526                                 perm[4] = 'S';
 527
 528                         perm[5] = ']';
 529                         perm[6] = '\0';
 530                         break;
 531
 532                 default:
 533                         perm[0] = '\0';
 534                         break;
 535                 }
 536
 537                 value = mc_readl(mc, MC_ERR_ADR);
 538                 addr |= value;
 539
 540                 dev_err_ratelimited(mc->dev, "%s: %s%s @%pa: %s (%s%s)\n",
 541                                     client, secure, direction, &addr, error,
 542                                     desc, perm);
 543         }
 544
 545         /* clear interrupts */
 546         mc_writel(mc, status, MC_INTSTATUS);
 547
 548         return IRQ_HANDLED;
 549 }
 550
 551 static __maybe_unused irqreturn_t tegra20_mc_irq(int irq, void *data)
 552 {
 553         struct tegra_mc *mc = data;
 554         unsigned long status;
 555         unsigned int bit;
 556
 557         /* mask all interrupts to avoid flooding */
 558         status = mc_readl(mc, MC_INTSTATUS) & mc->soc->intmask;
 559         if (!status)
 560                 return IRQ_NONE;
 561
 562         for_each_set_bit(bit, &status, 32) {
 563                 const char *direction = "read", *secure = "";
 564                 const char *error = status_names[bit];
 565                 const char *client, *desc;
 566                 phys_addr_t addr;
 567                 u32 value, reg;
 568                 u8 id, type;
 569
 570                 switch (BIT(bit)) {
 571                 case MC_INT_DECERR_EMEM:
 572                         reg = MC_DECERR_EMEM_OTHERS_STATUS;
 573                         value = mc_readl(mc, reg);
 574
 575                         id = value & mc->soc->client_id_mask;
 576                         desc = error_names[2];
 577
 578                         if (value & BIT(31))
 579                                 direction = "write";
 580                         break;
 581
 582                 case MC_INT_INVALID_GART_PAGE:
 583                         reg = MC_GART_ERROR_REQ;
 584                         value = mc_readl(mc, reg);
 585
 586                         id = (value >> 1) & mc->soc->client_id_mask;
 587                         desc = error_names[2];
 588
 589                         if (value & BIT(0))
 590                                 direction = "write";
 591                         break;
 592
 593                 case MC_INT_SECURITY_VIOLATION:
 594                         reg = MC_SECURITY_VIOLATION_STATUS;
 595                         value = mc_readl(mc, reg);
 596
 597                         id = value & mc->soc->client_id_mask;
 598                         type = (value & BIT(30)) ? 4 : 3;
 599                         desc = error_names[type];
 600                         secure = "secure ";
 601
 602                         if (value & BIT(31))
 603                                 direction = "write";
 604                         break;
 605
 606                 default:
 607                         continue;
 608                 }
 609
 610                 client = mc->soc->clients[id].name;
 611                 addr = mc_readl(mc, reg + sizeof(u32));
 612
 613                 dev_err_ratelimited(mc->dev, "%s: %s%s @%pa: %s (%s)\n",
 614                                     client, secure, direction, &addr, error,
 615                                     desc);
 616         }
 617
 618         /* clear interrupts */
 619         mc_writel(mc, status, MC_INTSTATUS);
 620
 621         return IRQ_HANDLED;
 622 }
 623
 624 static int tegra_mc_probe(struct platform_device *pdev)
 625 {
 626         struct resource *res;
 627         struct tegra_mc *mc;
 628         void *isr;
 629         int err;
 630
 631         mc = devm_kzalloc(&pdev->dev, sizeof(*mc), GFP_KERNEL);
 632         if (!mc)
 633                 return -ENOMEM;
 634
 635         platform_set_drvdata(pdev, mc);
 636         spin_lock_init(&mc->lock);
 637         mc->soc = of_device_get_match_data(&pdev->dev);
 638         mc->dev = &pdev->dev;
 639
 640         /* length of MC tick in nanoseconds */
 641         mc->tick = 30;
 642
 643         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 644         mc->regs = devm_ioremap_resource(&pdev->dev, res);
 645         if (IS_ERR(mc->regs))
 646                 return PTR_ERR(mc->regs);
 647
 648         mc->clk = devm_clk_get(&pdev->dev, "mc");
 649         if (IS_ERR(mc->clk)) {
 650                 dev_err(&pdev->dev, "failed to get MC clock: %ld\n",
 651                         PTR_ERR(mc->clk));
 652                 return PTR_ERR(mc->clk);
 653         }
 654
 655 #ifdef CONFIG_ARCH_TEGRA_2x_SOC
 656         if (mc->soc == &tegra20_mc_soc) {
 657                 isr = tegra20_mc_irq;
 658         } else
 659 #endif
 660         {
 661                 err = tegra_mc_setup_latency_allowance(mc);
 662                 if (err < 0) {
 663                         dev_err(&pdev->dev,
 664                                 "failed to setup latency allowance: %d\n",
 665                                 err);
 666                         return err;
 667                 }
 668
 669                 isr = tegra_mc_irq;
 670
 671                 err = tegra_mc_setup_timings(mc);
 672                 if (err < 0) {
 673                         dev_err(&pdev->dev, "failed to setup timings: %d\n",
 674                                 err);
 675                         return err;
 676                 }
 677         }
 678
 679         mc->irq = platform_get_irq(pdev, 0);
 680         if (mc->irq < 0) {
 681                 dev_err(&pdev->dev, "interrupt not specified\n");
 682                 return mc->irq;
 683         }
 684
 685         WARN(!mc->soc->client_id_mask, "missing client ID mask for this SoC\n");
 686
 687         mc_writel(mc, mc->soc->intmask, MC_INTMASK);
 688
 689         err = devm_request_irq(&pdev->dev, mc->irq, isr, 0,
 690                                dev_name(&pdev->dev), mc);
 691         if (err < 0) {
 692                 dev_err(&pdev->dev, "failed to request IRQ#%u: %d\n", mc->irq,
 693                         err);
 694                 return err;
 695         }
 696
 697         err = tegra_mc_reset_setup(mc);
 698         if (err < 0)
 699                 dev_err(&pdev->dev, "failed to register reset controller: %d\n",
 700                         err);
 701
 702         if (IS_ENABLED(CONFIG_TEGRA_IOMMU_SMMU) && mc->soc->smmu) {
 703                 mc->smmu = tegra_smmu_probe(&pdev->dev, mc->soc->smmu, mc);
 704                 if (IS_ERR(mc->smmu)) {
 705                         dev_err(&pdev->dev, "failed to probe SMMU: %ld\n",
 706                                 PTR_ERR(mc->smmu));
 707                         mc->smmu = NULL;
 708                 }
 709         }
 710
 711         if (IS_ENABLED(CONFIG_TEGRA_IOMMU_GART) && !mc->soc->smmu) {
 712                 mc->gart = tegra_gart_probe(&pdev->dev, mc);
 713                 if (IS_ERR(mc->gart)) {
 714                         dev_err(&pdev->dev, "failed to probe GART: %ld\n",
 715                                 PTR_ERR(mc->gart));
 716                         mc->gart = NULL;
 717                 }
 718         }
 719
 720         return 0;
 721 }
 722
 723 static int tegra_mc_suspend(struct device *dev)
 724 {
 725         struct tegra_mc *mc = dev_get_drvdata(dev);
 726         int err;
 727
 728         if (IS_ENABLED(CONFIG_TEGRA_IOMMU_GART) && mc->gart) {
 729                 err = tegra_gart_suspend(mc->gart);
 730                 if (err)
 731                         return err;
 732         }
 733
 734         return 0;
 735 }
 736
 737 static int tegra_mc_resume(struct device *dev)
 738 {
 739         struct tegra_mc *mc = dev_get_drvdata(dev);
 740         int err;
 741
 742         if (IS_ENABLED(CONFIG_TEGRA_IOMMU_GART) && mc->gart) {
 743                 err = tegra_gart_resume(mc->gart);
 744                 if (err)
 745                         return err;
 746         }
 747
 748         return 0;
 749 }
 750
 751 static const struct dev_pm_ops tegra_mc_pm_ops = {
 752         .suspend = tegra_mc_suspend,
 753         .resume = tegra_mc_resume,
 754 };
 755
 756 static struct platform_driver tegra_mc_driver = {
 757         .driver = {
 758                 .name = "tegra-mc",
 759                 .of_match_table = tegra_mc_of_match,
 760                 .pm = &tegra_mc_pm_ops,
 761                 .suppress_bind_attrs = true,
 762         },
 763         .prevent_deferred_probe = true,
 764         .probe = tegra_mc_probe,
 765 };
 766
 767 static int tegra_mc_init(void)
 768 {
 769         return platform_driver_register(&tegra_mc_driver);
 770 }
 771 arch_initcall(tegra_mc_init);
 772
 773 MODULE_AUTHOR("Thierry Reding <treding@nvidia.com>");
 774 MODULE_DESCRIPTION("NVIDIA Tegra Memory Controller driver");
 775 MODULE_LICENSE("GPL v2");