1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (c) 2013-2023, NVIDIA CORPORATION. All rights reserved. 4 */ 5 6 #include <linux/acpi.h> 7 #include <linux/clk.h> 8 #include <linux/device.h> 9 #include <linux/kobject.h> 10 #include <linux/init.h> 11 #include <linux/io.h> 12 #include <linux/mod_devicetable.h> 13 #include <linux/nvmem-consumer.h> 14 #include <linux/nvmem-provider.h> 15 #include <linux/of.h> 16 #include <linux/of_address.h> 17 #include <linux/platform_device.h> 18 #include <linux/pm_runtime.h> 19 #include <linux/reset.h> 20 #include <linux/slab.h> 21 #include <linux/sys_soc.h> 22 23 #include <soc/tegra/common.h> 24 #include <soc/tegra/fuse.h> 25 26 #include "fuse.h" 27 28 struct tegra_sku_info tegra_sku_info; 29 EXPORT_SYMBOL(tegra_sku_info); 30 31 static const char *tegra_revision_name[TEGRA_REVISION_MAX] = { 32 [TEGRA_REVISION_UNKNOWN] = "unknown", 33 [TEGRA_REVISION_A01] = "A01", 34 [TEGRA_REVISION_A02] = "A02", 35 [TEGRA_REVISION_A03] = "A03", 36 [TEGRA_REVISION_A03p] = "A03 prime", 37 [TEGRA_REVISION_A04] = "A04", 38 }; 39 40 static const char *tegra_platform_name[TEGRA_PLATFORM_MAX] = { 41 [TEGRA_PLATFORM_SILICON] = "Silicon", 42 [TEGRA_PLATFORM_QT] = "QT", 43 [TEGRA_PLATFORM_SYSTEM_FPGA] = "System FPGA", 44 [TEGRA_PLATFORM_UNIT_FPGA] = "Unit FPGA", 45 [TEGRA_PLATFORM_ASIM_QT] = "Asim QT", 46 [TEGRA_PLATFORM_ASIM_LINSIM] = "Asim Linsim", 47 [TEGRA_PLATFORM_DSIM_ASIM_LINSIM] = "Dsim Asim Linsim", 48 [TEGRA_PLATFORM_VERIFICATION_SIMULATION] = "Verification Simulation", 49 [TEGRA_PLATFORM_VDK] = "VDK", 50 [TEGRA_PLATFORM_VSP] = "VSP", 51 }; 52 53 static const struct of_device_id car_match[] __initconst = { 54 { .compatible = "nvidia,tegra20-car", }, 55 { .compatible = "nvidia,tegra30-car", }, 56 { .compatible = "nvidia,tegra114-car", }, 57 { .compatible = "nvidia,tegra124-car", }, 58 { .compatible = "nvidia,tegra132-car", }, 59 { .compatible = "nvidia,tegra210-car", }, 60 {}, 61 }; 62 63 static struct tegra_fuse *fuse = &(struct tegra_fuse) { 64 .base = NULL, 65 .soc = NULL, 66 }; 67 68 static const struct of_device_id tegra_fuse_match[] = { 69 #ifdef CONFIG_ARCH_TEGRA_234_SOC 70 { .compatible = "nvidia,tegra234-efuse", .data = &tegra234_fuse_soc }, 71 #endif 72 #ifdef CONFIG_ARCH_TEGRA_194_SOC 73 { .compatible = "nvidia,tegra194-efuse", .data = &tegra194_fuse_soc }, 74 #endif 75 #ifdef CONFIG_ARCH_TEGRA_186_SOC 76 { .compatible = "nvidia,tegra186-efuse", .data = &tegra186_fuse_soc }, 77 #endif 78 #ifdef CONFIG_ARCH_TEGRA_210_SOC 79 { .compatible = "nvidia,tegra210-efuse", .data = &tegra210_fuse_soc }, 80 #endif 81 #ifdef CONFIG_ARCH_TEGRA_132_SOC 82 { .compatible = "nvidia,tegra132-efuse", .data = &tegra124_fuse_soc }, 83 #endif 84 #ifdef CONFIG_ARCH_TEGRA_124_SOC 85 { .compatible = "nvidia,tegra124-efuse", .data = &tegra124_fuse_soc }, 86 #endif 87 #ifdef CONFIG_ARCH_TEGRA_114_SOC 88 { .compatible = "nvidia,tegra114-efuse", .data = &tegra114_fuse_soc }, 89 #endif 90 #ifdef CONFIG_ARCH_TEGRA_3x_SOC 91 { .compatible = "nvidia,tegra30-efuse", .data = &tegra30_fuse_soc }, 92 #endif 93 #ifdef CONFIG_ARCH_TEGRA_2x_SOC 94 { .compatible = "nvidia,tegra20-efuse", .data = &tegra20_fuse_soc }, 95 #endif 96 { /* sentinel */ } 97 }; 98 99 static int tegra_fuse_read(void *priv, unsigned int offset, void *value, 100 size_t bytes) 101 { 102 unsigned int count = bytes / 4, i; 103 struct tegra_fuse *fuse = priv; 104 u32 *buffer = value; 105 106 for (i = 0; i < count; i++) 107 buffer[i] = fuse->read(fuse, offset + i * 4); 108 109 return 0; 110 } 111 112 static void tegra_fuse_restore(void *base) 113 { 114 fuse->base = (void __iomem *)base; 115 fuse->clk = NULL; 116 } 117 118 static void tegra_fuse_print_sku_info(struct tegra_sku_info *tegra_sku_info) 119 { 120 pr_info("Tegra Revision: %s SKU: %d CPU Process: %d SoC Process: %d\n", 121 tegra_revision_name[tegra_sku_info->revision], 122 tegra_sku_info->sku_id, tegra_sku_info->cpu_process_id, 123 tegra_sku_info->soc_process_id); 124 pr_debug("Tegra CPU Speedo ID %d, SoC Speedo ID %d\n", 125 tegra_sku_info->cpu_speedo_id, tegra_sku_info->soc_speedo_id); 126 } 127 128 static int tegra_fuse_add_lookups(struct tegra_fuse *fuse) 129 { 130 fuse->lookups = kmemdup_array(fuse->soc->lookups, fuse->soc->num_lookups, 131 sizeof(*fuse->lookups), GFP_KERNEL); 132 if (!fuse->lookups) 133 return -ENOMEM; 134 135 nvmem_add_cell_lookups(fuse->lookups, fuse->soc->num_lookups); 136 137 return 0; 138 } 139 140 static int tegra_fuse_probe(struct platform_device *pdev) 141 { 142 void __iomem *base = fuse->base; 143 struct nvmem_config nvmem; 144 struct resource *res; 145 int err; 146 147 err = devm_add_action(&pdev->dev, tegra_fuse_restore, (void __force *)base); 148 if (err) 149 return err; 150 151 /* take over the memory region from the early initialization */ 152 fuse->base = devm_platform_get_and_ioremap_resource(pdev, 0, &res); 153 if (IS_ERR(fuse->base)) 154 return PTR_ERR(fuse->base); 155 fuse->phys = res->start; 156 157 /* Initialize the soc data and lookups if using ACPI boot. */ 158 if (is_acpi_node(dev_fwnode(&pdev->dev)) && !fuse->soc) { 159 u8 chip; 160 161 tegra_acpi_init_apbmisc(); 162 163 chip = tegra_get_chip_id(); 164 switch (chip) { 165 #if defined(CONFIG_ARCH_TEGRA_194_SOC) 166 case TEGRA194: 167 fuse->soc = &tegra194_fuse_soc; 168 break; 169 #endif 170 #if defined(CONFIG_ARCH_TEGRA_234_SOC) 171 case TEGRA234: 172 fuse->soc = &tegra234_fuse_soc; 173 break; 174 #endif 175 #if defined(CONFIG_ARCH_TEGRA_241_SOC) 176 case TEGRA241: 177 fuse->soc = &tegra241_fuse_soc; 178 break; 179 #endif 180 default: 181 return dev_err_probe(&pdev->dev, -EINVAL, "Unsupported SoC: %02x\n", chip); 182 } 183 184 fuse->soc->init(fuse); 185 tegra_fuse_print_sku_info(&tegra_sku_info); 186 tegra_soc_device_register(); 187 188 err = tegra_fuse_add_lookups(fuse); 189 if (err) 190 return dev_err_probe(&pdev->dev, err, "failed to add FUSE lookups\n"); 191 } 192 193 fuse->clk = devm_clk_get_optional(&pdev->dev, "fuse"); 194 if (IS_ERR(fuse->clk)) 195 return dev_err_probe(&pdev->dev, PTR_ERR(fuse->clk), "failed to get FUSE clock\n"); 196 197 platform_set_drvdata(pdev, fuse); 198 fuse->dev = &pdev->dev; 199 200 err = devm_pm_runtime_enable(&pdev->dev); 201 if (err) 202 return err; 203 204 if (fuse->soc->probe) { 205 err = fuse->soc->probe(fuse); 206 if (err < 0) 207 return err; 208 } 209 210 memset(&nvmem, 0, sizeof(nvmem)); 211 nvmem.dev = &pdev->dev; 212 nvmem.name = "fuse"; 213 nvmem.id = -1; 214 nvmem.owner = THIS_MODULE; 215 nvmem.cells = fuse->soc->cells; 216 nvmem.ncells = fuse->soc->num_cells; 217 nvmem.keepout = fuse->soc->keepouts; 218 nvmem.nkeepout = fuse->soc->num_keepouts; 219 nvmem.type = NVMEM_TYPE_OTP; 220 nvmem.read_only = true; 221 nvmem.root_only = false; 222 nvmem.reg_read = tegra_fuse_read; 223 nvmem.size = fuse->soc->info->size; 224 nvmem.word_size = 4; 225 nvmem.stride = 4; 226 nvmem.priv = fuse; 227 228 fuse->nvmem = devm_nvmem_register(&pdev->dev, &nvmem); 229 if (IS_ERR(fuse->nvmem)) { 230 err = PTR_ERR(fuse->nvmem); 231 dev_err(&pdev->dev, "failed to register NVMEM device: %d\n", 232 err); 233 return err; 234 } 235 236 fuse->rst = devm_reset_control_get_optional(&pdev->dev, "fuse"); 237 if (IS_ERR(fuse->rst)) 238 return dev_err_probe(&pdev->dev, PTR_ERR(fuse->rst), "failed to get FUSE reset\n"); 239 240 /* 241 * FUSE clock is enabled at a boot time, hence this resume/suspend 242 * disables the clock besides the h/w resetting. 243 */ 244 err = pm_runtime_resume_and_get(&pdev->dev); 245 if (err) 246 return err; 247 248 err = reset_control_reset(fuse->rst); 249 pm_runtime_put(&pdev->dev); 250 251 if (err < 0) { 252 dev_err(&pdev->dev, "failed to reset FUSE: %d\n", err); 253 return err; 254 } 255 256 /* release the early I/O memory mapping */ 257 iounmap(base); 258 259 return 0; 260 } 261 262 static int __maybe_unused tegra_fuse_runtime_resume(struct device *dev) 263 { 264 int err; 265 266 err = clk_prepare_enable(fuse->clk); 267 if (err < 0) { 268 dev_err(dev, "failed to enable FUSE clock: %d\n", err); 269 return err; 270 } 271 272 return 0; 273 } 274 275 static int __maybe_unused tegra_fuse_runtime_suspend(struct device *dev) 276 { 277 clk_disable_unprepare(fuse->clk); 278 279 return 0; 280 } 281 282 static int __maybe_unused tegra_fuse_suspend(struct device *dev) 283 { 284 int ret; 285 286 /* 287 * Critical for RAM re-repair operation, which must occur on resume 288 * from LP1 system suspend and as part of CCPLEX cluster switching. 289 */ 290 if (fuse->soc->clk_suspend_on) 291 ret = pm_runtime_resume_and_get(dev); 292 else 293 ret = pm_runtime_force_suspend(dev); 294 295 return ret; 296 } 297 298 static int __maybe_unused tegra_fuse_resume(struct device *dev) 299 { 300 int ret = 0; 301 302 if (fuse->soc->clk_suspend_on) 303 pm_runtime_put(dev); 304 else 305 ret = pm_runtime_force_resume(dev); 306 307 return ret; 308 } 309 310 static const struct dev_pm_ops tegra_fuse_pm = { 311 SET_RUNTIME_PM_OPS(tegra_fuse_runtime_suspend, tegra_fuse_runtime_resume, 312 NULL) 313 SET_SYSTEM_SLEEP_PM_OPS(tegra_fuse_suspend, tegra_fuse_resume) 314 }; 315 316 static const struct acpi_device_id tegra_fuse_acpi_match[] = { 317 { "NVDA200F" }, 318 { /* sentinel */ } 319 }; 320 MODULE_DEVICE_TABLE(acpi, tegra_fuse_acpi_match); 321 322 static struct platform_driver tegra_fuse_driver = { 323 .driver = { 324 .name = "tegra-fuse", 325 .of_match_table = tegra_fuse_match, 326 .acpi_match_table = tegra_fuse_acpi_match, 327 .pm = &tegra_fuse_pm, 328 .suppress_bind_attrs = true, 329 }, 330 .probe = tegra_fuse_probe, 331 }; 332 builtin_platform_driver(tegra_fuse_driver); 333 334 u32 __init tegra_fuse_read_spare(unsigned int spare) 335 { 336 unsigned int offset = fuse->soc->info->spare + spare * 4; 337 338 return fuse->read_early(fuse, offset) & 1; 339 } 340 341 u32 __init tegra_fuse_read_early(unsigned int offset) 342 { 343 return fuse->read_early(fuse, offset); 344 } 345 346 int tegra_fuse_readl(unsigned long offset, u32 *value) 347 { 348 if (!fuse->dev) 349 return -EPROBE_DEFER; 350 351 /* 352 * Wait for fuse->clk to be initialized if device-tree boot is used. 353 */ 354 if (is_of_node(dev_fwnode(fuse->dev)) && !fuse->clk) 355 return -EPROBE_DEFER; 356 357 if (!fuse->read) 358 return -EPROBE_DEFER; 359 360 if (IS_ERR(fuse->clk)) 361 return PTR_ERR(fuse->clk); 362 363 *value = fuse->read(fuse, offset); 364 365 return 0; 366 } 367 EXPORT_SYMBOL(tegra_fuse_readl); 368 369 static void tegra_enable_fuse_clk(void __iomem *base) 370 { 371 u32 reg; 372 373 reg = readl_relaxed(base + 0x48); 374 reg |= 1 << 28; 375 writel(reg, base + 0x48); 376 377 /* 378 * Enable FUSE clock. This needs to be hardcoded because the clock 379 * subsystem is not active during early boot. 380 */ 381 reg = readl(base + 0x14); 382 reg |= 1 << 7; 383 writel(reg, base + 0x14); 384 } 385 386 static ssize_t major_show(struct device *dev, struct device_attribute *attr, 387 char *buf) 388 { 389 return sprintf(buf, "%d\n", tegra_get_major_rev()); 390 } 391 392 static DEVICE_ATTR_RO(major); 393 394 static ssize_t minor_show(struct device *dev, struct device_attribute *attr, 395 char *buf) 396 { 397 return sprintf(buf, "%d\n", tegra_get_minor_rev()); 398 } 399 400 static DEVICE_ATTR_RO(minor); 401 402 static struct attribute *tegra_soc_attr[] = { 403 &dev_attr_major.attr, 404 &dev_attr_minor.attr, 405 NULL, 406 }; 407 408 const struct attribute_group tegra_soc_attr_group = { 409 .attrs = tegra_soc_attr, 410 }; 411 412 #if IS_ENABLED(CONFIG_ARCH_TEGRA_194_SOC) || \ 413 IS_ENABLED(CONFIG_ARCH_TEGRA_234_SOC) || \ 414 IS_ENABLED(CONFIG_ARCH_TEGRA_241_SOC) 415 static ssize_t platform_show(struct device *dev, struct device_attribute *attr, 416 char *buf) 417 { 418 /* 419 * Displays the value in the 'pre_si_platform' field of the HIDREV 420 * register for Tegra194 devices. A value of 0 indicates that the 421 * platform type is silicon and all other non-zero values indicate 422 * the type of simulation platform is being used. 423 */ 424 return sprintf(buf, "%d\n", tegra_get_platform()); 425 } 426 427 static DEVICE_ATTR_RO(platform); 428 429 static struct attribute *tegra194_soc_attr[] = { 430 &dev_attr_major.attr, 431 &dev_attr_minor.attr, 432 &dev_attr_platform.attr, 433 NULL, 434 }; 435 436 const struct attribute_group tegra194_soc_attr_group = { 437 .attrs = tegra194_soc_attr, 438 }; 439 #endif 440 441 struct device *tegra_soc_device_register(void) 442 { 443 struct soc_device_attribute *attr; 444 struct soc_device *dev; 445 446 attr = kzalloc(sizeof(*attr), GFP_KERNEL); 447 if (!attr) 448 return NULL; 449 450 attr->family = kasprintf(GFP_KERNEL, "Tegra"); 451 if (tegra_is_silicon()) 452 attr->revision = kasprintf(GFP_KERNEL, "%s %s", 453 tegra_platform_name[tegra_sku_info.platform], 454 tegra_revision_name[tegra_sku_info.revision]); 455 else 456 attr->revision = kasprintf(GFP_KERNEL, "%s", 457 tegra_platform_name[tegra_sku_info.platform]); 458 attr->soc_id = kasprintf(GFP_KERNEL, "%u", tegra_get_chip_id()); 459 attr->custom_attr_group = fuse->soc->soc_attr_group; 460 461 dev = soc_device_register(attr); 462 if (IS_ERR(dev)) { 463 kfree(attr->soc_id); 464 kfree(attr->revision); 465 kfree(attr->family); 466 kfree(attr); 467 return ERR_CAST(dev); 468 } 469 470 return soc_device_to_device(dev); 471 } 472 473 static int __init tegra_init_fuse(void) 474 { 475 const struct of_device_id *match; 476 struct device_node *np; 477 struct resource regs; 478 int err; 479 480 tegra_init_apbmisc(); 481 482 np = of_find_matching_node_and_match(NULL, tegra_fuse_match, &match); 483 if (!np) { 484 /* 485 * Fall back to legacy initialization for 32-bit ARM only. All 486 * 64-bit ARM device tree files for Tegra are required to have 487 * a FUSE node. 488 * 489 * This is for backwards-compatibility with old device trees 490 * that didn't contain a FUSE node. 491 */ 492 if (IS_ENABLED(CONFIG_ARM) && soc_is_tegra()) { 493 u8 chip = tegra_get_chip_id(); 494 495 regs.start = 0x7000f800; 496 regs.end = 0x7000fbff; 497 regs.flags = IORESOURCE_MEM; 498 499 switch (chip) { 500 #ifdef CONFIG_ARCH_TEGRA_2x_SOC 501 case TEGRA20: 502 fuse->soc = &tegra20_fuse_soc; 503 break; 504 #endif 505 506 #ifdef CONFIG_ARCH_TEGRA_3x_SOC 507 case TEGRA30: 508 fuse->soc = &tegra30_fuse_soc; 509 break; 510 #endif 511 512 #ifdef CONFIG_ARCH_TEGRA_114_SOC 513 case TEGRA114: 514 fuse->soc = &tegra114_fuse_soc; 515 break; 516 #endif 517 518 #ifdef CONFIG_ARCH_TEGRA_124_SOC 519 case TEGRA124: 520 fuse->soc = &tegra124_fuse_soc; 521 break; 522 #endif 523 524 default: 525 pr_warn("Unsupported SoC: %02x\n", chip); 526 break; 527 } 528 } else { 529 /* 530 * At this point we're not running on Tegra, so play 531 * nice with multi-platform kernels. 532 */ 533 return 0; 534 } 535 } else { 536 /* 537 * Extract information from the device tree if we've found a 538 * matching node. 539 */ 540 if (of_address_to_resource(np, 0, ®s) < 0) { 541 pr_err("failed to get FUSE register\n"); 542 return -ENXIO; 543 } 544 545 fuse->soc = match->data; 546 } 547 548 np = of_find_matching_node(NULL, car_match); 549 if (np) { 550 void __iomem *base = of_iomap(np, 0); 551 of_node_put(np); 552 if (base) { 553 tegra_enable_fuse_clk(base); 554 iounmap(base); 555 } else { 556 pr_err("failed to map clock registers\n"); 557 return -ENXIO; 558 } 559 } 560 561 fuse->base = ioremap(regs.start, resource_size(®s)); 562 if (!fuse->base) { 563 pr_err("failed to map FUSE registers\n"); 564 return -ENXIO; 565 } 566 567 fuse->soc->init(fuse); 568 569 tegra_fuse_print_sku_info(&tegra_sku_info); 570 571 err = tegra_fuse_add_lookups(fuse); 572 if (err) 573 pr_err("failed to add FUSE lookups\n"); 574 575 return err; 576 } 577 early_initcall(tegra_init_fuse); 578 579 #ifdef CONFIG_ARM64 580 static int __init tegra_init_soc(void) 581 { 582 struct device_node *np; 583 struct device *soc; 584 585 /* make sure we're running on Tegra */ 586 np = of_find_matching_node(NULL, tegra_fuse_match); 587 if (!np) 588 return 0; 589 590 of_node_put(np); 591 592 soc = tegra_soc_device_register(); 593 if (IS_ERR(soc)) { 594 pr_err("failed to register SoC device: %ld\n", PTR_ERR(soc)); 595 return PTR_ERR(soc); 596 } 597 598 return 0; 599 } 600 device_initcall(tegra_init_soc); 601 #endif 602