1 /* 2 * drivers/soc/tegra/pmc.c 3 * 4 * Copyright (c) 2010 Google, Inc 5 * 6 * Author: 7 * Colin Cross <ccross@google.com> 8 * 9 * This software is licensed under the terms of the GNU General Public 10 * License version 2, as published by the Free Software Foundation, and 11 * may be copied, distributed, and modified under those terms. 12 * 13 * This program is distributed in the hope that it will be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 * GNU General Public License for more details. 17 * 18 */ 19 20 #define pr_fmt(fmt) "tegra-pmc: " fmt 21 22 #include <linux/kernel.h> 23 #include <linux/clk.h> 24 #include <linux/clk/tegra.h> 25 #include <linux/debugfs.h> 26 #include <linux/delay.h> 27 #include <linux/err.h> 28 #include <linux/export.h> 29 #include <linux/init.h> 30 #include <linux/io.h> 31 #include <linux/iopoll.h> 32 #include <linux/of.h> 33 #include <linux/of_address.h> 34 #include <linux/of_platform.h> 35 #include <linux/platform_device.h> 36 #include <linux/pm_domain.h> 37 #include <linux/reboot.h> 38 #include <linux/reset.h> 39 #include <linux/seq_file.h> 40 #include <linux/slab.h> 41 #include <linux/spinlock.h> 42 43 #include <soc/tegra/common.h> 44 #include <soc/tegra/fuse.h> 45 #include <soc/tegra/pmc.h> 46 47 #define PMC_CNTRL 0x0 48 #define PMC_CNTRL_INTR_POLARITY BIT(17) /* inverts INTR polarity */ 49 #define PMC_CNTRL_CPU_PWRREQ_OE BIT(16) /* CPU pwr req enable */ 50 #define PMC_CNTRL_CPU_PWRREQ_POLARITY BIT(15) /* CPU pwr req polarity */ 51 #define PMC_CNTRL_SIDE_EFFECT_LP0 BIT(14) /* LP0 when CPU pwr gated */ 52 #define PMC_CNTRL_SYSCLK_OE BIT(11) /* system clock enable */ 53 #define PMC_CNTRL_SYSCLK_POLARITY BIT(10) /* sys clk polarity */ 54 #define PMC_CNTRL_MAIN_RST BIT(4) 55 56 #define DPD_SAMPLE 0x020 57 #define DPD_SAMPLE_ENABLE BIT(0) 58 #define DPD_SAMPLE_DISABLE (0 << 0) 59 60 #define PWRGATE_TOGGLE 0x30 61 #define PWRGATE_TOGGLE_START BIT(8) 62 63 #define REMOVE_CLAMPING 0x34 64 65 #define PWRGATE_STATUS 0x38 66 67 #define PMC_PWR_DET 0x48 68 69 #define PMC_SCRATCH0 0x50 70 #define PMC_SCRATCH0_MODE_RECOVERY BIT(31) 71 #define PMC_SCRATCH0_MODE_BOOTLOADER BIT(30) 72 #define PMC_SCRATCH0_MODE_RCM BIT(1) 73 #define PMC_SCRATCH0_MODE_MASK (PMC_SCRATCH0_MODE_RECOVERY | \ 74 PMC_SCRATCH0_MODE_BOOTLOADER | \ 75 PMC_SCRATCH0_MODE_RCM) 76 77 #define PMC_CPUPWRGOOD_TIMER 0xc8 78 #define PMC_CPUPWROFF_TIMER 0xcc 79 80 #define PMC_PWR_DET_VALUE 0xe4 81 82 #define PMC_SCRATCH41 0x140 83 84 #define PMC_SENSOR_CTRL 0x1b0 85 #define PMC_SENSOR_CTRL_SCRATCH_WRITE BIT(2) 86 #define PMC_SENSOR_CTRL_ENABLE_RST BIT(1) 87 88 #define PMC_RST_STATUS 0x1b4 89 #define PMC_RST_STATUS_POR 0 90 #define PMC_RST_STATUS_WATCHDOG 1 91 #define PMC_RST_STATUS_SENSOR 2 92 #define PMC_RST_STATUS_SW_MAIN 3 93 #define PMC_RST_STATUS_LP0 4 94 #define PMC_RST_STATUS_AOTAG 5 95 96 #define IO_DPD_REQ 0x1b8 97 #define IO_DPD_REQ_CODE_IDLE (0U << 30) 98 #define IO_DPD_REQ_CODE_OFF (1U << 30) 99 #define IO_DPD_REQ_CODE_ON (2U << 30) 100 #define IO_DPD_REQ_CODE_MASK (3U << 30) 101 102 #define IO_DPD_STATUS 0x1bc 103 #define IO_DPD2_REQ 0x1c0 104 #define IO_DPD2_STATUS 0x1c4 105 #define SEL_DPD_TIM 0x1c8 106 107 #define PMC_SCRATCH54 0x258 108 #define PMC_SCRATCH54_DATA_SHIFT 8 109 #define PMC_SCRATCH54_ADDR_SHIFT 0 110 111 #define PMC_SCRATCH55 0x25c 112 #define PMC_SCRATCH55_RESET_TEGRA BIT(31) 113 #define PMC_SCRATCH55_CNTRL_ID_SHIFT 27 114 #define PMC_SCRATCH55_PINMUX_SHIFT 24 115 #define PMC_SCRATCH55_16BITOP BIT(15) 116 #define PMC_SCRATCH55_CHECKSUM_SHIFT 16 117 #define PMC_SCRATCH55_I2CSLV1_SHIFT 0 118 119 #define GPU_RG_CNTRL 0x2d4 120 121 struct tegra_powergate { 122 struct generic_pm_domain genpd; 123 struct tegra_pmc *pmc; 124 unsigned int id; 125 struct clk **clks; 126 unsigned int num_clks; 127 struct reset_control **resets; 128 unsigned int num_resets; 129 }; 130 131 struct tegra_io_pad_soc { 132 enum tegra_io_pad id; 133 unsigned int dpd; 134 unsigned int voltage; 135 }; 136 137 struct tegra_pmc_soc { 138 unsigned int num_powergates; 139 const char *const *powergates; 140 unsigned int num_cpu_powergates; 141 const u8 *cpu_powergates; 142 143 bool has_tsense_reset; 144 bool has_gpu_clamps; 145 146 const struct tegra_io_pad_soc *io_pads; 147 unsigned int num_io_pads; 148 }; 149 150 /** 151 * struct tegra_pmc - NVIDIA Tegra PMC 152 * @dev: pointer to PMC device structure 153 * @base: pointer to I/O remapped register region 154 * @clk: pointer to pclk clock 155 * @soc: pointer to SoC data structure 156 * @debugfs: pointer to debugfs entry 157 * @rate: currently configured rate of pclk 158 * @suspend_mode: lowest suspend mode available 159 * @cpu_good_time: CPU power good time (in microseconds) 160 * @cpu_off_time: CPU power off time (in microsecends) 161 * @core_osc_time: core power good OSC time (in microseconds) 162 * @core_pmu_time: core power good PMU time (in microseconds) 163 * @core_off_time: core power off time (in microseconds) 164 * @corereq_high: core power request is active-high 165 * @sysclkreq_high: system clock request is active-high 166 * @combined_req: combined power request for CPU & core 167 * @cpu_pwr_good_en: CPU power good signal is enabled 168 * @lp0_vec_phys: physical base address of the LP0 warm boot code 169 * @lp0_vec_size: size of the LP0 warm boot code 170 * @powergates_available: Bitmap of available power gates 171 * @powergates_lock: mutex for power gate register access 172 */ 173 struct tegra_pmc { 174 struct device *dev; 175 void __iomem *base; 176 struct clk *clk; 177 struct dentry *debugfs; 178 179 const struct tegra_pmc_soc *soc; 180 181 unsigned long rate; 182 183 enum tegra_suspend_mode suspend_mode; 184 u32 cpu_good_time; 185 u32 cpu_off_time; 186 u32 core_osc_time; 187 u32 core_pmu_time; 188 u32 core_off_time; 189 bool corereq_high; 190 bool sysclkreq_high; 191 bool combined_req; 192 bool cpu_pwr_good_en; 193 u32 lp0_vec_phys; 194 u32 lp0_vec_size; 195 DECLARE_BITMAP(powergates_available, TEGRA_POWERGATE_MAX); 196 197 struct mutex powergates_lock; 198 }; 199 200 static struct tegra_pmc *pmc = &(struct tegra_pmc) { 201 .base = NULL, 202 .suspend_mode = TEGRA_SUSPEND_NONE, 203 }; 204 205 static inline struct tegra_powergate * 206 to_powergate(struct generic_pm_domain *domain) 207 { 208 return container_of(domain, struct tegra_powergate, genpd); 209 } 210 211 static u32 tegra_pmc_readl(unsigned long offset) 212 { 213 return readl(pmc->base + offset); 214 } 215 216 static void tegra_pmc_writel(u32 value, unsigned long offset) 217 { 218 writel(value, pmc->base + offset); 219 } 220 221 static inline bool tegra_powergate_state(int id) 222 { 223 if (id == TEGRA_POWERGATE_3D && pmc->soc->has_gpu_clamps) 224 return (tegra_pmc_readl(GPU_RG_CNTRL) & 0x1) == 0; 225 else 226 return (tegra_pmc_readl(PWRGATE_STATUS) & BIT(id)) != 0; 227 } 228 229 static inline bool tegra_powergate_is_valid(int id) 230 { 231 return (pmc->soc && pmc->soc->powergates[id]); 232 } 233 234 static inline bool tegra_powergate_is_available(int id) 235 { 236 return test_bit(id, pmc->powergates_available); 237 } 238 239 static int tegra_powergate_lookup(struct tegra_pmc *pmc, const char *name) 240 { 241 unsigned int i; 242 243 if (!pmc || !pmc->soc || !name) 244 return -EINVAL; 245 246 for (i = 0; i < pmc->soc->num_powergates; i++) { 247 if (!tegra_powergate_is_valid(i)) 248 continue; 249 250 if (!strcmp(name, pmc->soc->powergates[i])) 251 return i; 252 } 253 254 return -ENODEV; 255 } 256 257 /** 258 * tegra_powergate_set() - set the state of a partition 259 * @id: partition ID 260 * @new_state: new state of the partition 261 */ 262 static int tegra_powergate_set(unsigned int id, bool new_state) 263 { 264 bool status; 265 int err; 266 267 if (id == TEGRA_POWERGATE_3D && pmc->soc->has_gpu_clamps) 268 return -EINVAL; 269 270 mutex_lock(&pmc->powergates_lock); 271 272 if (tegra_powergate_state(id) == new_state) { 273 mutex_unlock(&pmc->powergates_lock); 274 return 0; 275 } 276 277 tegra_pmc_writel(PWRGATE_TOGGLE_START | id, PWRGATE_TOGGLE); 278 279 err = readx_poll_timeout(tegra_powergate_state, id, status, 280 status == new_state, 10, 100000); 281 282 mutex_unlock(&pmc->powergates_lock); 283 284 return err; 285 } 286 287 static int __tegra_powergate_remove_clamping(unsigned int id) 288 { 289 u32 mask; 290 291 mutex_lock(&pmc->powergates_lock); 292 293 /* 294 * On Tegra124 and later, the clamps for the GPU are controlled by a 295 * separate register (with different semantics). 296 */ 297 if (id == TEGRA_POWERGATE_3D) { 298 if (pmc->soc->has_gpu_clamps) { 299 tegra_pmc_writel(0, GPU_RG_CNTRL); 300 goto out; 301 } 302 } 303 304 /* 305 * Tegra 2 has a bug where PCIE and VDE clamping masks are 306 * swapped relatively to the partition ids 307 */ 308 if (id == TEGRA_POWERGATE_VDEC) 309 mask = (1 << TEGRA_POWERGATE_PCIE); 310 else if (id == TEGRA_POWERGATE_PCIE) 311 mask = (1 << TEGRA_POWERGATE_VDEC); 312 else 313 mask = (1 << id); 314 315 tegra_pmc_writel(mask, REMOVE_CLAMPING); 316 317 out: 318 mutex_unlock(&pmc->powergates_lock); 319 320 return 0; 321 } 322 323 static void tegra_powergate_disable_clocks(struct tegra_powergate *pg) 324 { 325 unsigned int i; 326 327 for (i = 0; i < pg->num_clks; i++) 328 clk_disable_unprepare(pg->clks[i]); 329 } 330 331 static int tegra_powergate_enable_clocks(struct tegra_powergate *pg) 332 { 333 unsigned int i; 334 int err; 335 336 for (i = 0; i < pg->num_clks; i++) { 337 err = clk_prepare_enable(pg->clks[i]); 338 if (err) 339 goto out; 340 } 341 342 return 0; 343 344 out: 345 while (i--) 346 clk_disable_unprepare(pg->clks[i]); 347 348 return err; 349 } 350 351 static int tegra_powergate_reset_assert(struct tegra_powergate *pg) 352 { 353 unsigned int i; 354 int err; 355 356 for (i = 0; i < pg->num_resets; i++) { 357 err = reset_control_assert(pg->resets[i]); 358 if (err) 359 return err; 360 } 361 362 return 0; 363 } 364 365 static int tegra_powergate_reset_deassert(struct tegra_powergate *pg) 366 { 367 unsigned int i; 368 int err; 369 370 for (i = 0; i < pg->num_resets; i++) { 371 err = reset_control_deassert(pg->resets[i]); 372 if (err) 373 return err; 374 } 375 376 return 0; 377 } 378 379 static int tegra_powergate_power_up(struct tegra_powergate *pg, 380 bool disable_clocks) 381 { 382 int err; 383 384 err = tegra_powergate_reset_assert(pg); 385 if (err) 386 return err; 387 388 usleep_range(10, 20); 389 390 err = tegra_powergate_set(pg->id, true); 391 if (err < 0) 392 return err; 393 394 usleep_range(10, 20); 395 396 err = tegra_powergate_enable_clocks(pg); 397 if (err) 398 goto disable_clks; 399 400 usleep_range(10, 20); 401 402 err = __tegra_powergate_remove_clamping(pg->id); 403 if (err) 404 goto disable_clks; 405 406 usleep_range(10, 20); 407 408 err = tegra_powergate_reset_deassert(pg); 409 if (err) 410 goto powergate_off; 411 412 usleep_range(10, 20); 413 414 if (disable_clocks) 415 tegra_powergate_disable_clocks(pg); 416 417 return 0; 418 419 disable_clks: 420 tegra_powergate_disable_clocks(pg); 421 usleep_range(10, 20); 422 423 powergate_off: 424 tegra_powergate_set(pg->id, false); 425 426 return err; 427 } 428 429 static int tegra_powergate_power_down(struct tegra_powergate *pg) 430 { 431 int err; 432 433 err = tegra_powergate_enable_clocks(pg); 434 if (err) 435 return err; 436 437 usleep_range(10, 20); 438 439 err = tegra_powergate_reset_assert(pg); 440 if (err) 441 goto disable_clks; 442 443 usleep_range(10, 20); 444 445 tegra_powergate_disable_clocks(pg); 446 447 usleep_range(10, 20); 448 449 err = tegra_powergate_set(pg->id, false); 450 if (err) 451 goto assert_resets; 452 453 return 0; 454 455 assert_resets: 456 tegra_powergate_enable_clocks(pg); 457 usleep_range(10, 20); 458 tegra_powergate_reset_deassert(pg); 459 usleep_range(10, 20); 460 461 disable_clks: 462 tegra_powergate_disable_clocks(pg); 463 464 return err; 465 } 466 467 static int tegra_genpd_power_on(struct generic_pm_domain *domain) 468 { 469 struct tegra_powergate *pg = to_powergate(domain); 470 int err; 471 472 err = tegra_powergate_power_up(pg, true); 473 if (err) 474 pr_err("failed to turn on PM domain %s: %d\n", pg->genpd.name, 475 err); 476 477 return err; 478 } 479 480 static int tegra_genpd_power_off(struct generic_pm_domain *domain) 481 { 482 struct tegra_powergate *pg = to_powergate(domain); 483 int err; 484 485 err = tegra_powergate_power_down(pg); 486 if (err) 487 pr_err("failed to turn off PM domain %s: %d\n", 488 pg->genpd.name, err); 489 490 return err; 491 } 492 493 /** 494 * tegra_powergate_power_on() - power on partition 495 * @id: partition ID 496 */ 497 int tegra_powergate_power_on(unsigned int id) 498 { 499 if (!tegra_powergate_is_available(id)) 500 return -EINVAL; 501 502 return tegra_powergate_set(id, true); 503 } 504 505 /** 506 * tegra_powergate_power_off() - power off partition 507 * @id: partition ID 508 */ 509 int tegra_powergate_power_off(unsigned int id) 510 { 511 if (!tegra_powergate_is_available(id)) 512 return -EINVAL; 513 514 return tegra_powergate_set(id, false); 515 } 516 EXPORT_SYMBOL(tegra_powergate_power_off); 517 518 /** 519 * tegra_powergate_is_powered() - check if partition is powered 520 * @id: partition ID 521 */ 522 int tegra_powergate_is_powered(unsigned int id) 523 { 524 int status; 525 526 if (!tegra_powergate_is_valid(id)) 527 return -EINVAL; 528 529 mutex_lock(&pmc->powergates_lock); 530 status = tegra_powergate_state(id); 531 mutex_unlock(&pmc->powergates_lock); 532 533 return status; 534 } 535 536 /** 537 * tegra_powergate_remove_clamping() - remove power clamps for partition 538 * @id: partition ID 539 */ 540 int tegra_powergate_remove_clamping(unsigned int id) 541 { 542 if (!tegra_powergate_is_available(id)) 543 return -EINVAL; 544 545 return __tegra_powergate_remove_clamping(id); 546 } 547 EXPORT_SYMBOL(tegra_powergate_remove_clamping); 548 549 /** 550 * tegra_powergate_sequence_power_up() - power up partition 551 * @id: partition ID 552 * @clk: clock for partition 553 * @rst: reset for partition 554 * 555 * Must be called with clk disabled, and returns with clk enabled. 556 */ 557 int tegra_powergate_sequence_power_up(unsigned int id, struct clk *clk, 558 struct reset_control *rst) 559 { 560 struct tegra_powergate pg; 561 int err; 562 563 if (!tegra_powergate_is_available(id)) 564 return -EINVAL; 565 566 pg.id = id; 567 pg.clks = &clk; 568 pg.num_clks = 1; 569 pg.resets = &rst; 570 pg.num_resets = 1; 571 572 err = tegra_powergate_power_up(&pg, false); 573 if (err) 574 pr_err("failed to turn on partition %d: %d\n", id, err); 575 576 return err; 577 } 578 EXPORT_SYMBOL(tegra_powergate_sequence_power_up); 579 580 #ifdef CONFIG_SMP 581 /** 582 * tegra_get_cpu_powergate_id() - convert from CPU ID to partition ID 583 * @cpuid: CPU partition ID 584 * 585 * Returns the partition ID corresponding to the CPU partition ID or a 586 * negative error code on failure. 587 */ 588 static int tegra_get_cpu_powergate_id(unsigned int cpuid) 589 { 590 if (pmc->soc && cpuid < pmc->soc->num_cpu_powergates) 591 return pmc->soc->cpu_powergates[cpuid]; 592 593 return -EINVAL; 594 } 595 596 /** 597 * tegra_pmc_cpu_is_powered() - check if CPU partition is powered 598 * @cpuid: CPU partition ID 599 */ 600 bool tegra_pmc_cpu_is_powered(unsigned int cpuid) 601 { 602 int id; 603 604 id = tegra_get_cpu_powergate_id(cpuid); 605 if (id < 0) 606 return false; 607 608 return tegra_powergate_is_powered(id); 609 } 610 611 /** 612 * tegra_pmc_cpu_power_on() - power on CPU partition 613 * @cpuid: CPU partition ID 614 */ 615 int tegra_pmc_cpu_power_on(unsigned int cpuid) 616 { 617 int id; 618 619 id = tegra_get_cpu_powergate_id(cpuid); 620 if (id < 0) 621 return id; 622 623 return tegra_powergate_set(id, true); 624 } 625 626 /** 627 * tegra_pmc_cpu_remove_clamping() - remove power clamps for CPU partition 628 * @cpuid: CPU partition ID 629 */ 630 int tegra_pmc_cpu_remove_clamping(unsigned int cpuid) 631 { 632 int id; 633 634 id = tegra_get_cpu_powergate_id(cpuid); 635 if (id < 0) 636 return id; 637 638 return tegra_powergate_remove_clamping(id); 639 } 640 #endif /* CONFIG_SMP */ 641 642 static int tegra_pmc_restart_notify(struct notifier_block *this, 643 unsigned long action, void *data) 644 { 645 const char *cmd = data; 646 u32 value; 647 648 value = tegra_pmc_readl(PMC_SCRATCH0); 649 value &= ~PMC_SCRATCH0_MODE_MASK; 650 651 if (cmd) { 652 if (strcmp(cmd, "recovery") == 0) 653 value |= PMC_SCRATCH0_MODE_RECOVERY; 654 655 if (strcmp(cmd, "bootloader") == 0) 656 value |= PMC_SCRATCH0_MODE_BOOTLOADER; 657 658 if (strcmp(cmd, "forced-recovery") == 0) 659 value |= PMC_SCRATCH0_MODE_RCM; 660 } 661 662 tegra_pmc_writel(value, PMC_SCRATCH0); 663 664 /* reset everything but PMC_SCRATCH0 and PMC_RST_STATUS */ 665 value = tegra_pmc_readl(PMC_CNTRL); 666 value |= PMC_CNTRL_MAIN_RST; 667 tegra_pmc_writel(value, PMC_CNTRL); 668 669 return NOTIFY_DONE; 670 } 671 672 static struct notifier_block tegra_pmc_restart_handler = { 673 .notifier_call = tegra_pmc_restart_notify, 674 .priority = 128, 675 }; 676 677 static int powergate_show(struct seq_file *s, void *data) 678 { 679 unsigned int i; 680 int status; 681 682 seq_printf(s, " powergate powered\n"); 683 seq_printf(s, "------------------\n"); 684 685 for (i = 0; i < pmc->soc->num_powergates; i++) { 686 status = tegra_powergate_is_powered(i); 687 if (status < 0) 688 continue; 689 690 seq_printf(s, " %9s %7s\n", pmc->soc->powergates[i], 691 status ? "yes" : "no"); 692 } 693 694 return 0; 695 } 696 697 static int powergate_open(struct inode *inode, struct file *file) 698 { 699 return single_open(file, powergate_show, inode->i_private); 700 } 701 702 static const struct file_operations powergate_fops = { 703 .open = powergate_open, 704 .read = seq_read, 705 .llseek = seq_lseek, 706 .release = single_release, 707 }; 708 709 static int tegra_powergate_debugfs_init(void) 710 { 711 pmc->debugfs = debugfs_create_file("powergate", S_IRUGO, NULL, NULL, 712 &powergate_fops); 713 if (!pmc->debugfs) 714 return -ENOMEM; 715 716 return 0; 717 } 718 719 static int tegra_powergate_of_get_clks(struct tegra_powergate *pg, 720 struct device_node *np) 721 { 722 struct clk *clk; 723 unsigned int i, count; 724 int err; 725 726 count = of_count_phandle_with_args(np, "clocks", "#clock-cells"); 727 if (count == 0) 728 return -ENODEV; 729 730 pg->clks = kcalloc(count, sizeof(clk), GFP_KERNEL); 731 if (!pg->clks) 732 return -ENOMEM; 733 734 for (i = 0; i < count; i++) { 735 pg->clks[i] = of_clk_get(np, i); 736 if (IS_ERR(pg->clks[i])) { 737 err = PTR_ERR(pg->clks[i]); 738 goto err; 739 } 740 } 741 742 pg->num_clks = count; 743 744 return 0; 745 746 err: 747 while (i--) 748 clk_put(pg->clks[i]); 749 750 kfree(pg->clks); 751 752 return err; 753 } 754 755 static int tegra_powergate_of_get_resets(struct tegra_powergate *pg, 756 struct device_node *np, bool off) 757 { 758 struct reset_control *rst; 759 unsigned int i, count; 760 int err; 761 762 count = of_count_phandle_with_args(np, "resets", "#reset-cells"); 763 if (count == 0) 764 return -ENODEV; 765 766 pg->resets = kcalloc(count, sizeof(rst), GFP_KERNEL); 767 if (!pg->resets) 768 return -ENOMEM; 769 770 for (i = 0; i < count; i++) { 771 pg->resets[i] = of_reset_control_get_by_index(np, i); 772 if (IS_ERR(pg->resets[i])) { 773 err = PTR_ERR(pg->resets[i]); 774 goto error; 775 } 776 777 if (off) 778 err = reset_control_assert(pg->resets[i]); 779 else 780 err = reset_control_deassert(pg->resets[i]); 781 782 if (err) { 783 reset_control_put(pg->resets[i]); 784 goto error; 785 } 786 } 787 788 pg->num_resets = count; 789 790 return 0; 791 792 error: 793 while (i--) 794 reset_control_put(pg->resets[i]); 795 796 kfree(pg->resets); 797 798 return err; 799 } 800 801 static void tegra_powergate_add(struct tegra_pmc *pmc, struct device_node *np) 802 { 803 struct tegra_powergate *pg; 804 int id, err; 805 bool off; 806 807 pg = kzalloc(sizeof(*pg), GFP_KERNEL); 808 if (!pg) 809 return; 810 811 id = tegra_powergate_lookup(pmc, np->name); 812 if (id < 0) { 813 pr_err("powergate lookup failed for %s: %d\n", np->name, id); 814 goto free_mem; 815 } 816 817 /* 818 * Clear the bit for this powergate so it cannot be managed 819 * directly via the legacy APIs for controlling powergates. 820 */ 821 clear_bit(id, pmc->powergates_available); 822 823 pg->id = id; 824 pg->genpd.name = np->name; 825 pg->genpd.power_off = tegra_genpd_power_off; 826 pg->genpd.power_on = tegra_genpd_power_on; 827 pg->pmc = pmc; 828 829 off = !tegra_powergate_is_powered(pg->id); 830 831 err = tegra_powergate_of_get_clks(pg, np); 832 if (err < 0) { 833 pr_err("failed to get clocks for %s: %d\n", np->name, err); 834 goto set_available; 835 } 836 837 err = tegra_powergate_of_get_resets(pg, np, off); 838 if (err < 0) { 839 pr_err("failed to get resets for %s: %d\n", np->name, err); 840 goto remove_clks; 841 } 842 843 if (!IS_ENABLED(CONFIG_PM_GENERIC_DOMAINS)) { 844 if (off) 845 WARN_ON(tegra_powergate_power_up(pg, true)); 846 847 goto remove_resets; 848 } 849 850 /* 851 * FIXME: If XHCI is enabled for Tegra, then power-up the XUSB 852 * host and super-speed partitions. Once the XHCI driver 853 * manages the partitions itself this code can be removed. Note 854 * that we don't register these partitions with the genpd core 855 * to avoid it from powering down the partitions as they appear 856 * to be unused. 857 */ 858 if (IS_ENABLED(CONFIG_USB_XHCI_TEGRA) && 859 (id == TEGRA_POWERGATE_XUSBA || id == TEGRA_POWERGATE_XUSBC)) { 860 if (off) 861 WARN_ON(tegra_powergate_power_up(pg, true)); 862 863 goto remove_resets; 864 } 865 866 err = pm_genpd_init(&pg->genpd, NULL, off); 867 if (err < 0) { 868 pr_err("failed to initialise PM domain %s: %d\n", np->name, 869 err); 870 goto remove_resets; 871 } 872 873 err = of_genpd_add_provider_simple(np, &pg->genpd); 874 if (err < 0) { 875 pr_err("failed to add PM domain provider for %s: %d\n", 876 np->name, err); 877 goto remove_genpd; 878 } 879 880 pr_debug("added PM domain %s\n", pg->genpd.name); 881 882 return; 883 884 remove_genpd: 885 pm_genpd_remove(&pg->genpd); 886 887 remove_resets: 888 while (pg->num_resets--) 889 reset_control_put(pg->resets[pg->num_resets]); 890 891 kfree(pg->resets); 892 893 remove_clks: 894 while (pg->num_clks--) 895 clk_put(pg->clks[pg->num_clks]); 896 897 kfree(pg->clks); 898 899 set_available: 900 set_bit(id, pmc->powergates_available); 901 902 free_mem: 903 kfree(pg); 904 } 905 906 static void tegra_powergate_init(struct tegra_pmc *pmc, 907 struct device_node *parent) 908 { 909 struct device_node *np, *child; 910 unsigned int i; 911 912 /* Create a bitmap of the available and valid partitions */ 913 for (i = 0; i < pmc->soc->num_powergates; i++) 914 if (pmc->soc->powergates[i]) 915 set_bit(i, pmc->powergates_available); 916 917 np = of_get_child_by_name(parent, "powergates"); 918 if (!np) 919 return; 920 921 for_each_child_of_node(np, child) 922 tegra_powergate_add(pmc, child); 923 924 of_node_put(np); 925 } 926 927 static const struct tegra_io_pad_soc * 928 tegra_io_pad_find(struct tegra_pmc *pmc, enum tegra_io_pad id) 929 { 930 unsigned int i; 931 932 for (i = 0; i < pmc->soc->num_io_pads; i++) 933 if (pmc->soc->io_pads[i].id == id) 934 return &pmc->soc->io_pads[i]; 935 936 return NULL; 937 } 938 939 static int tegra_io_pad_prepare(enum tegra_io_pad id, unsigned long *request, 940 unsigned long *status, u32 *mask) 941 { 942 const struct tegra_io_pad_soc *pad; 943 unsigned long rate, value; 944 945 pad = tegra_io_pad_find(pmc, id); 946 if (!pad) { 947 pr_err("invalid I/O pad ID %u\n", id); 948 return -ENOENT; 949 } 950 951 if (pad->dpd == UINT_MAX) 952 return -ENOTSUPP; 953 954 *mask = BIT(pad->dpd % 32); 955 956 if (pad->dpd < 32) { 957 *status = IO_DPD_STATUS; 958 *request = IO_DPD_REQ; 959 } else { 960 *status = IO_DPD2_STATUS; 961 *request = IO_DPD2_REQ; 962 } 963 964 rate = clk_get_rate(pmc->clk); 965 if (!rate) { 966 pr_err("failed to get clock rate\n"); 967 return -ENODEV; 968 } 969 970 tegra_pmc_writel(DPD_SAMPLE_ENABLE, DPD_SAMPLE); 971 972 /* must be at least 200 ns, in APB (PCLK) clock cycles */ 973 value = DIV_ROUND_UP(1000000000, rate); 974 value = DIV_ROUND_UP(200, value); 975 tegra_pmc_writel(value, SEL_DPD_TIM); 976 977 return 0; 978 } 979 980 static int tegra_io_pad_poll(unsigned long offset, u32 mask, 981 u32 val, unsigned long timeout) 982 { 983 u32 value; 984 985 timeout = jiffies + msecs_to_jiffies(timeout); 986 987 while (time_after(timeout, jiffies)) { 988 value = tegra_pmc_readl(offset); 989 if ((value & mask) == val) 990 return 0; 991 992 usleep_range(250, 1000); 993 } 994 995 return -ETIMEDOUT; 996 } 997 998 static void tegra_io_pad_unprepare(void) 999 { 1000 tegra_pmc_writel(DPD_SAMPLE_DISABLE, DPD_SAMPLE); 1001 } 1002 1003 /** 1004 * tegra_io_pad_power_enable() - enable power to I/O pad 1005 * @id: Tegra I/O pad ID for which to enable power 1006 * 1007 * Returns: 0 on success or a negative error code on failure. 1008 */ 1009 int tegra_io_pad_power_enable(enum tegra_io_pad id) 1010 { 1011 unsigned long request, status; 1012 u32 mask; 1013 int err; 1014 1015 mutex_lock(&pmc->powergates_lock); 1016 1017 err = tegra_io_pad_prepare(id, &request, &status, &mask); 1018 if (err < 0) { 1019 pr_err("failed to prepare I/O pad: %d\n", err); 1020 goto unlock; 1021 } 1022 1023 tegra_pmc_writel(IO_DPD_REQ_CODE_OFF | mask, request); 1024 1025 err = tegra_io_pad_poll(status, mask, 0, 250); 1026 if (err < 0) { 1027 pr_err("failed to enable I/O pad: %d\n", err); 1028 goto unlock; 1029 } 1030 1031 tegra_io_pad_unprepare(); 1032 1033 unlock: 1034 mutex_unlock(&pmc->powergates_lock); 1035 return err; 1036 } 1037 EXPORT_SYMBOL(tegra_io_pad_power_enable); 1038 1039 /** 1040 * tegra_io_pad_power_disable() - disable power to I/O pad 1041 * @id: Tegra I/O pad ID for which to disable power 1042 * 1043 * Returns: 0 on success or a negative error code on failure. 1044 */ 1045 int tegra_io_pad_power_disable(enum tegra_io_pad id) 1046 { 1047 unsigned long request, status; 1048 u32 mask; 1049 int err; 1050 1051 mutex_lock(&pmc->powergates_lock); 1052 1053 err = tegra_io_pad_prepare(id, &request, &status, &mask); 1054 if (err < 0) { 1055 pr_err("failed to prepare I/O pad: %d\n", err); 1056 goto unlock; 1057 } 1058 1059 tegra_pmc_writel(IO_DPD_REQ_CODE_ON | mask, request); 1060 1061 err = tegra_io_pad_poll(status, mask, mask, 250); 1062 if (err < 0) { 1063 pr_err("failed to disable I/O pad: %d\n", err); 1064 goto unlock; 1065 } 1066 1067 tegra_io_pad_unprepare(); 1068 1069 unlock: 1070 mutex_unlock(&pmc->powergates_lock); 1071 return err; 1072 } 1073 EXPORT_SYMBOL(tegra_io_pad_power_disable); 1074 1075 int tegra_io_pad_set_voltage(enum tegra_io_pad id, 1076 enum tegra_io_pad_voltage voltage) 1077 { 1078 const struct tegra_io_pad_soc *pad; 1079 u32 value; 1080 1081 pad = tegra_io_pad_find(pmc, id); 1082 if (!pad) 1083 return -ENOENT; 1084 1085 if (pad->voltage == UINT_MAX) 1086 return -ENOTSUPP; 1087 1088 mutex_lock(&pmc->powergates_lock); 1089 1090 /* write-enable PMC_PWR_DET_VALUE[pad->voltage] */ 1091 value = tegra_pmc_readl(PMC_PWR_DET); 1092 value |= BIT(pad->voltage); 1093 tegra_pmc_writel(value, PMC_PWR_DET); 1094 1095 /* update I/O voltage */ 1096 value = tegra_pmc_readl(PMC_PWR_DET_VALUE); 1097 1098 if (voltage == TEGRA_IO_PAD_1800000UV) 1099 value &= ~BIT(pad->voltage); 1100 else 1101 value |= BIT(pad->voltage); 1102 1103 tegra_pmc_writel(value, PMC_PWR_DET_VALUE); 1104 1105 mutex_unlock(&pmc->powergates_lock); 1106 1107 usleep_range(100, 250); 1108 1109 return 0; 1110 } 1111 EXPORT_SYMBOL(tegra_io_pad_set_voltage); 1112 1113 int tegra_io_pad_get_voltage(enum tegra_io_pad id) 1114 { 1115 const struct tegra_io_pad_soc *pad; 1116 u32 value; 1117 1118 pad = tegra_io_pad_find(pmc, id); 1119 if (!pad) 1120 return -ENOENT; 1121 1122 if (pad->voltage == UINT_MAX) 1123 return -ENOTSUPP; 1124 1125 value = tegra_pmc_readl(PMC_PWR_DET_VALUE); 1126 1127 if ((value & BIT(pad->voltage)) == 0) 1128 return TEGRA_IO_PAD_1800000UV; 1129 1130 return TEGRA_IO_PAD_3300000UV; 1131 } 1132 EXPORT_SYMBOL(tegra_io_pad_get_voltage); 1133 1134 /** 1135 * tegra_io_rail_power_on() - enable power to I/O rail 1136 * @id: Tegra I/O pad ID for which to enable power 1137 * 1138 * See also: tegra_io_pad_power_enable() 1139 */ 1140 int tegra_io_rail_power_on(unsigned int id) 1141 { 1142 return tegra_io_pad_power_enable(id); 1143 } 1144 EXPORT_SYMBOL(tegra_io_rail_power_on); 1145 1146 /** 1147 * tegra_io_rail_power_off() - disable power to I/O rail 1148 * @id: Tegra I/O pad ID for which to disable power 1149 * 1150 * See also: tegra_io_pad_power_disable() 1151 */ 1152 int tegra_io_rail_power_off(unsigned int id) 1153 { 1154 return tegra_io_pad_power_disable(id); 1155 } 1156 EXPORT_SYMBOL(tegra_io_rail_power_off); 1157 1158 #ifdef CONFIG_PM_SLEEP 1159 enum tegra_suspend_mode tegra_pmc_get_suspend_mode(void) 1160 { 1161 return pmc->suspend_mode; 1162 } 1163 1164 void tegra_pmc_set_suspend_mode(enum tegra_suspend_mode mode) 1165 { 1166 if (mode < TEGRA_SUSPEND_NONE || mode >= TEGRA_MAX_SUSPEND_MODE) 1167 return; 1168 1169 pmc->suspend_mode = mode; 1170 } 1171 1172 void tegra_pmc_enter_suspend_mode(enum tegra_suspend_mode mode) 1173 { 1174 unsigned long long rate = 0; 1175 u32 value; 1176 1177 switch (mode) { 1178 case TEGRA_SUSPEND_LP1: 1179 rate = 32768; 1180 break; 1181 1182 case TEGRA_SUSPEND_LP2: 1183 rate = clk_get_rate(pmc->clk); 1184 break; 1185 1186 default: 1187 break; 1188 } 1189 1190 if (WARN_ON_ONCE(rate == 0)) 1191 rate = 100000000; 1192 1193 if (rate != pmc->rate) { 1194 u64 ticks; 1195 1196 ticks = pmc->cpu_good_time * rate + USEC_PER_SEC - 1; 1197 do_div(ticks, USEC_PER_SEC); 1198 tegra_pmc_writel(ticks, PMC_CPUPWRGOOD_TIMER); 1199 1200 ticks = pmc->cpu_off_time * rate + USEC_PER_SEC - 1; 1201 do_div(ticks, USEC_PER_SEC); 1202 tegra_pmc_writel(ticks, PMC_CPUPWROFF_TIMER); 1203 1204 wmb(); 1205 1206 pmc->rate = rate; 1207 } 1208 1209 value = tegra_pmc_readl(PMC_CNTRL); 1210 value &= ~PMC_CNTRL_SIDE_EFFECT_LP0; 1211 value |= PMC_CNTRL_CPU_PWRREQ_OE; 1212 tegra_pmc_writel(value, PMC_CNTRL); 1213 } 1214 #endif 1215 1216 static int tegra_pmc_parse_dt(struct tegra_pmc *pmc, struct device_node *np) 1217 { 1218 u32 value, values[2]; 1219 1220 if (of_property_read_u32(np, "nvidia,suspend-mode", &value)) { 1221 } else { 1222 switch (value) { 1223 case 0: 1224 pmc->suspend_mode = TEGRA_SUSPEND_LP0; 1225 break; 1226 1227 case 1: 1228 pmc->suspend_mode = TEGRA_SUSPEND_LP1; 1229 break; 1230 1231 case 2: 1232 pmc->suspend_mode = TEGRA_SUSPEND_LP2; 1233 break; 1234 1235 default: 1236 pmc->suspend_mode = TEGRA_SUSPEND_NONE; 1237 break; 1238 } 1239 } 1240 1241 pmc->suspend_mode = tegra_pm_validate_suspend_mode(pmc->suspend_mode); 1242 1243 if (of_property_read_u32(np, "nvidia,cpu-pwr-good-time", &value)) 1244 pmc->suspend_mode = TEGRA_SUSPEND_NONE; 1245 1246 pmc->cpu_good_time = value; 1247 1248 if (of_property_read_u32(np, "nvidia,cpu-pwr-off-time", &value)) 1249 pmc->suspend_mode = TEGRA_SUSPEND_NONE; 1250 1251 pmc->cpu_off_time = value; 1252 1253 if (of_property_read_u32_array(np, "nvidia,core-pwr-good-time", 1254 values, ARRAY_SIZE(values))) 1255 pmc->suspend_mode = TEGRA_SUSPEND_NONE; 1256 1257 pmc->core_osc_time = values[0]; 1258 pmc->core_pmu_time = values[1]; 1259 1260 if (of_property_read_u32(np, "nvidia,core-pwr-off-time", &value)) 1261 pmc->suspend_mode = TEGRA_SUSPEND_NONE; 1262 1263 pmc->core_off_time = value; 1264 1265 pmc->corereq_high = of_property_read_bool(np, 1266 "nvidia,core-power-req-active-high"); 1267 1268 pmc->sysclkreq_high = of_property_read_bool(np, 1269 "nvidia,sys-clock-req-active-high"); 1270 1271 pmc->combined_req = of_property_read_bool(np, 1272 "nvidia,combined-power-req"); 1273 1274 pmc->cpu_pwr_good_en = of_property_read_bool(np, 1275 "nvidia,cpu-pwr-good-en"); 1276 1277 if (of_property_read_u32_array(np, "nvidia,lp0-vec", values, 1278 ARRAY_SIZE(values))) 1279 if (pmc->suspend_mode == TEGRA_SUSPEND_LP0) 1280 pmc->suspend_mode = TEGRA_SUSPEND_LP1; 1281 1282 pmc->lp0_vec_phys = values[0]; 1283 pmc->lp0_vec_size = values[1]; 1284 1285 return 0; 1286 } 1287 1288 static void tegra_pmc_init(struct tegra_pmc *pmc) 1289 { 1290 u32 value; 1291 1292 /* Always enable CPU power request */ 1293 value = tegra_pmc_readl(PMC_CNTRL); 1294 value |= PMC_CNTRL_CPU_PWRREQ_OE; 1295 tegra_pmc_writel(value, PMC_CNTRL); 1296 1297 value = tegra_pmc_readl(PMC_CNTRL); 1298 1299 if (pmc->sysclkreq_high) 1300 value &= ~PMC_CNTRL_SYSCLK_POLARITY; 1301 else 1302 value |= PMC_CNTRL_SYSCLK_POLARITY; 1303 1304 /* configure the output polarity while the request is tristated */ 1305 tegra_pmc_writel(value, PMC_CNTRL); 1306 1307 /* now enable the request */ 1308 value = tegra_pmc_readl(PMC_CNTRL); 1309 value |= PMC_CNTRL_SYSCLK_OE; 1310 tegra_pmc_writel(value, PMC_CNTRL); 1311 } 1312 1313 static void tegra_pmc_init_tsense_reset(struct tegra_pmc *pmc) 1314 { 1315 static const char disabled[] = "emergency thermal reset disabled"; 1316 u32 pmu_addr, ctrl_id, reg_addr, reg_data, pinmux; 1317 struct device *dev = pmc->dev; 1318 struct device_node *np; 1319 u32 value, checksum; 1320 1321 if (!pmc->soc->has_tsense_reset) 1322 return; 1323 1324 np = of_find_node_by_name(pmc->dev->of_node, "i2c-thermtrip"); 1325 if (!np) { 1326 dev_warn(dev, "i2c-thermtrip node not found, %s.\n", disabled); 1327 return; 1328 } 1329 1330 if (of_property_read_u32(np, "nvidia,i2c-controller-id", &ctrl_id)) { 1331 dev_err(dev, "I2C controller ID missing, %s.\n", disabled); 1332 goto out; 1333 } 1334 1335 if (of_property_read_u32(np, "nvidia,bus-addr", &pmu_addr)) { 1336 dev_err(dev, "nvidia,bus-addr missing, %s.\n", disabled); 1337 goto out; 1338 } 1339 1340 if (of_property_read_u32(np, "nvidia,reg-addr", ®_addr)) { 1341 dev_err(dev, "nvidia,reg-addr missing, %s.\n", disabled); 1342 goto out; 1343 } 1344 1345 if (of_property_read_u32(np, "nvidia,reg-data", ®_data)) { 1346 dev_err(dev, "nvidia,reg-data missing, %s.\n", disabled); 1347 goto out; 1348 } 1349 1350 if (of_property_read_u32(np, "nvidia,pinmux-id", &pinmux)) 1351 pinmux = 0; 1352 1353 value = tegra_pmc_readl(PMC_SENSOR_CTRL); 1354 value |= PMC_SENSOR_CTRL_SCRATCH_WRITE; 1355 tegra_pmc_writel(value, PMC_SENSOR_CTRL); 1356 1357 value = (reg_data << PMC_SCRATCH54_DATA_SHIFT) | 1358 (reg_addr << PMC_SCRATCH54_ADDR_SHIFT); 1359 tegra_pmc_writel(value, PMC_SCRATCH54); 1360 1361 value = PMC_SCRATCH55_RESET_TEGRA; 1362 value |= ctrl_id << PMC_SCRATCH55_CNTRL_ID_SHIFT; 1363 value |= pinmux << PMC_SCRATCH55_PINMUX_SHIFT; 1364 value |= pmu_addr << PMC_SCRATCH55_I2CSLV1_SHIFT; 1365 1366 /* 1367 * Calculate checksum of SCRATCH54, SCRATCH55 fields. Bits 23:16 will 1368 * contain the checksum and are currently zero, so they are not added. 1369 */ 1370 checksum = reg_addr + reg_data + (value & 0xff) + ((value >> 8) & 0xff) 1371 + ((value >> 24) & 0xff); 1372 checksum &= 0xff; 1373 checksum = 0x100 - checksum; 1374 1375 value |= checksum << PMC_SCRATCH55_CHECKSUM_SHIFT; 1376 1377 tegra_pmc_writel(value, PMC_SCRATCH55); 1378 1379 value = tegra_pmc_readl(PMC_SENSOR_CTRL); 1380 value |= PMC_SENSOR_CTRL_ENABLE_RST; 1381 tegra_pmc_writel(value, PMC_SENSOR_CTRL); 1382 1383 dev_info(pmc->dev, "emergency thermal reset enabled\n"); 1384 1385 out: 1386 of_node_put(np); 1387 } 1388 1389 static int tegra_pmc_probe(struct platform_device *pdev) 1390 { 1391 void __iomem *base; 1392 struct resource *res; 1393 int err; 1394 1395 /* 1396 * Early initialisation should have configured an initial 1397 * register mapping and setup the soc data pointer. If these 1398 * are not valid then something went badly wrong! 1399 */ 1400 if (WARN_ON(!pmc->base || !pmc->soc)) 1401 return -ENODEV; 1402 1403 err = tegra_pmc_parse_dt(pmc, pdev->dev.of_node); 1404 if (err < 0) 1405 return err; 1406 1407 /* take over the memory region from the early initialization */ 1408 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 1409 base = devm_ioremap_resource(&pdev->dev, res); 1410 if (IS_ERR(base)) 1411 return PTR_ERR(base); 1412 1413 pmc->clk = devm_clk_get(&pdev->dev, "pclk"); 1414 if (IS_ERR(pmc->clk)) { 1415 err = PTR_ERR(pmc->clk); 1416 dev_err(&pdev->dev, "failed to get pclk: %d\n", err); 1417 return err; 1418 } 1419 1420 pmc->dev = &pdev->dev; 1421 1422 tegra_pmc_init(pmc); 1423 1424 tegra_pmc_init_tsense_reset(pmc); 1425 1426 if (IS_ENABLED(CONFIG_DEBUG_FS)) { 1427 err = tegra_powergate_debugfs_init(); 1428 if (err < 0) 1429 return err; 1430 } 1431 1432 err = register_restart_handler(&tegra_pmc_restart_handler); 1433 if (err) { 1434 debugfs_remove(pmc->debugfs); 1435 dev_err(&pdev->dev, "unable to register restart handler, %d\n", 1436 err); 1437 return err; 1438 } 1439 1440 mutex_lock(&pmc->powergates_lock); 1441 iounmap(pmc->base); 1442 pmc->base = base; 1443 mutex_unlock(&pmc->powergates_lock); 1444 1445 return 0; 1446 } 1447 1448 #if defined(CONFIG_PM_SLEEP) && defined(CONFIG_ARM) 1449 static int tegra_pmc_suspend(struct device *dev) 1450 { 1451 tegra_pmc_writel(virt_to_phys(tegra_resume), PMC_SCRATCH41); 1452 1453 return 0; 1454 } 1455 1456 static int tegra_pmc_resume(struct device *dev) 1457 { 1458 tegra_pmc_writel(0x0, PMC_SCRATCH41); 1459 1460 return 0; 1461 } 1462 1463 static SIMPLE_DEV_PM_OPS(tegra_pmc_pm_ops, tegra_pmc_suspend, tegra_pmc_resume); 1464 1465 #endif 1466 1467 static const char * const tegra20_powergates[] = { 1468 [TEGRA_POWERGATE_CPU] = "cpu", 1469 [TEGRA_POWERGATE_3D] = "3d", 1470 [TEGRA_POWERGATE_VENC] = "venc", 1471 [TEGRA_POWERGATE_VDEC] = "vdec", 1472 [TEGRA_POWERGATE_PCIE] = "pcie", 1473 [TEGRA_POWERGATE_L2] = "l2", 1474 [TEGRA_POWERGATE_MPE] = "mpe", 1475 }; 1476 1477 static const struct tegra_pmc_soc tegra20_pmc_soc = { 1478 .num_powergates = ARRAY_SIZE(tegra20_powergates), 1479 .powergates = tegra20_powergates, 1480 .num_cpu_powergates = 0, 1481 .cpu_powergates = NULL, 1482 .has_tsense_reset = false, 1483 .has_gpu_clamps = false, 1484 }; 1485 1486 static const char * const tegra30_powergates[] = { 1487 [TEGRA_POWERGATE_CPU] = "cpu0", 1488 [TEGRA_POWERGATE_3D] = "3d0", 1489 [TEGRA_POWERGATE_VENC] = "venc", 1490 [TEGRA_POWERGATE_VDEC] = "vdec", 1491 [TEGRA_POWERGATE_PCIE] = "pcie", 1492 [TEGRA_POWERGATE_L2] = "l2", 1493 [TEGRA_POWERGATE_MPE] = "mpe", 1494 [TEGRA_POWERGATE_HEG] = "heg", 1495 [TEGRA_POWERGATE_SATA] = "sata", 1496 [TEGRA_POWERGATE_CPU1] = "cpu1", 1497 [TEGRA_POWERGATE_CPU2] = "cpu2", 1498 [TEGRA_POWERGATE_CPU3] = "cpu3", 1499 [TEGRA_POWERGATE_CELP] = "celp", 1500 [TEGRA_POWERGATE_3D1] = "3d1", 1501 }; 1502 1503 static const u8 tegra30_cpu_powergates[] = { 1504 TEGRA_POWERGATE_CPU, 1505 TEGRA_POWERGATE_CPU1, 1506 TEGRA_POWERGATE_CPU2, 1507 TEGRA_POWERGATE_CPU3, 1508 }; 1509 1510 static const struct tegra_pmc_soc tegra30_pmc_soc = { 1511 .num_powergates = ARRAY_SIZE(tegra30_powergates), 1512 .powergates = tegra30_powergates, 1513 .num_cpu_powergates = ARRAY_SIZE(tegra30_cpu_powergates), 1514 .cpu_powergates = tegra30_cpu_powergates, 1515 .has_tsense_reset = true, 1516 .has_gpu_clamps = false, 1517 }; 1518 1519 static const char * const tegra114_powergates[] = { 1520 [TEGRA_POWERGATE_CPU] = "crail", 1521 [TEGRA_POWERGATE_3D] = "3d", 1522 [TEGRA_POWERGATE_VENC] = "venc", 1523 [TEGRA_POWERGATE_VDEC] = "vdec", 1524 [TEGRA_POWERGATE_MPE] = "mpe", 1525 [TEGRA_POWERGATE_HEG] = "heg", 1526 [TEGRA_POWERGATE_CPU1] = "cpu1", 1527 [TEGRA_POWERGATE_CPU2] = "cpu2", 1528 [TEGRA_POWERGATE_CPU3] = "cpu3", 1529 [TEGRA_POWERGATE_CELP] = "celp", 1530 [TEGRA_POWERGATE_CPU0] = "cpu0", 1531 [TEGRA_POWERGATE_C0NC] = "c0nc", 1532 [TEGRA_POWERGATE_C1NC] = "c1nc", 1533 [TEGRA_POWERGATE_DIS] = "dis", 1534 [TEGRA_POWERGATE_DISB] = "disb", 1535 [TEGRA_POWERGATE_XUSBA] = "xusba", 1536 [TEGRA_POWERGATE_XUSBB] = "xusbb", 1537 [TEGRA_POWERGATE_XUSBC] = "xusbc", 1538 }; 1539 1540 static const u8 tegra114_cpu_powergates[] = { 1541 TEGRA_POWERGATE_CPU0, 1542 TEGRA_POWERGATE_CPU1, 1543 TEGRA_POWERGATE_CPU2, 1544 TEGRA_POWERGATE_CPU3, 1545 }; 1546 1547 static const struct tegra_pmc_soc tegra114_pmc_soc = { 1548 .num_powergates = ARRAY_SIZE(tegra114_powergates), 1549 .powergates = tegra114_powergates, 1550 .num_cpu_powergates = ARRAY_SIZE(tegra114_cpu_powergates), 1551 .cpu_powergates = tegra114_cpu_powergates, 1552 .has_tsense_reset = true, 1553 .has_gpu_clamps = false, 1554 }; 1555 1556 static const char * const tegra124_powergates[] = { 1557 [TEGRA_POWERGATE_CPU] = "crail", 1558 [TEGRA_POWERGATE_3D] = "3d", 1559 [TEGRA_POWERGATE_VENC] = "venc", 1560 [TEGRA_POWERGATE_PCIE] = "pcie", 1561 [TEGRA_POWERGATE_VDEC] = "vdec", 1562 [TEGRA_POWERGATE_MPE] = "mpe", 1563 [TEGRA_POWERGATE_HEG] = "heg", 1564 [TEGRA_POWERGATE_SATA] = "sata", 1565 [TEGRA_POWERGATE_CPU1] = "cpu1", 1566 [TEGRA_POWERGATE_CPU2] = "cpu2", 1567 [TEGRA_POWERGATE_CPU3] = "cpu3", 1568 [TEGRA_POWERGATE_CELP] = "celp", 1569 [TEGRA_POWERGATE_CPU0] = "cpu0", 1570 [TEGRA_POWERGATE_C0NC] = "c0nc", 1571 [TEGRA_POWERGATE_C1NC] = "c1nc", 1572 [TEGRA_POWERGATE_SOR] = "sor", 1573 [TEGRA_POWERGATE_DIS] = "dis", 1574 [TEGRA_POWERGATE_DISB] = "disb", 1575 [TEGRA_POWERGATE_XUSBA] = "xusba", 1576 [TEGRA_POWERGATE_XUSBB] = "xusbb", 1577 [TEGRA_POWERGATE_XUSBC] = "xusbc", 1578 [TEGRA_POWERGATE_VIC] = "vic", 1579 [TEGRA_POWERGATE_IRAM] = "iram", 1580 }; 1581 1582 static const u8 tegra124_cpu_powergates[] = { 1583 TEGRA_POWERGATE_CPU0, 1584 TEGRA_POWERGATE_CPU1, 1585 TEGRA_POWERGATE_CPU2, 1586 TEGRA_POWERGATE_CPU3, 1587 }; 1588 1589 static const struct tegra_io_pad_soc tegra124_io_pads[] = { 1590 { .id = TEGRA_IO_PAD_AUDIO, .dpd = 17, .voltage = UINT_MAX }, 1591 { .id = TEGRA_IO_PAD_BB, .dpd = 15, .voltage = UINT_MAX }, 1592 { .id = TEGRA_IO_PAD_CAM, .dpd = 36, .voltage = UINT_MAX }, 1593 { .id = TEGRA_IO_PAD_COMP, .dpd = 22, .voltage = UINT_MAX }, 1594 { .id = TEGRA_IO_PAD_CSIA, .dpd = 0, .voltage = UINT_MAX }, 1595 { .id = TEGRA_IO_PAD_CSIB, .dpd = 1, .voltage = UINT_MAX }, 1596 { .id = TEGRA_IO_PAD_CSIE, .dpd = 44, .voltage = UINT_MAX }, 1597 { .id = TEGRA_IO_PAD_DSI, .dpd = 2, .voltage = UINT_MAX }, 1598 { .id = TEGRA_IO_PAD_DSIB, .dpd = 39, .voltage = UINT_MAX }, 1599 { .id = TEGRA_IO_PAD_DSIC, .dpd = 40, .voltage = UINT_MAX }, 1600 { .id = TEGRA_IO_PAD_DSID, .dpd = 41, .voltage = UINT_MAX }, 1601 { .id = TEGRA_IO_PAD_HDMI, .dpd = 28, .voltage = UINT_MAX }, 1602 { .id = TEGRA_IO_PAD_HSIC, .dpd = 19, .voltage = UINT_MAX }, 1603 { .id = TEGRA_IO_PAD_HV, .dpd = 38, .voltage = UINT_MAX }, 1604 { .id = TEGRA_IO_PAD_LVDS, .dpd = 57, .voltage = UINT_MAX }, 1605 { .id = TEGRA_IO_PAD_MIPI_BIAS, .dpd = 3, .voltage = UINT_MAX }, 1606 { .id = TEGRA_IO_PAD_NAND, .dpd = 13, .voltage = UINT_MAX }, 1607 { .id = TEGRA_IO_PAD_PEX_BIAS, .dpd = 4, .voltage = UINT_MAX }, 1608 { .id = TEGRA_IO_PAD_PEX_CLK1, .dpd = 5, .voltage = UINT_MAX }, 1609 { .id = TEGRA_IO_PAD_PEX_CLK2, .dpd = 6, .voltage = UINT_MAX }, 1610 { .id = TEGRA_IO_PAD_PEX_CNTRL, .dpd = 32, .voltage = UINT_MAX }, 1611 { .id = TEGRA_IO_PAD_SDMMC1, .dpd = 33, .voltage = UINT_MAX }, 1612 { .id = TEGRA_IO_PAD_SDMMC3, .dpd = 34, .voltage = UINT_MAX }, 1613 { .id = TEGRA_IO_PAD_SDMMC4, .dpd = 35, .voltage = UINT_MAX }, 1614 { .id = TEGRA_IO_PAD_SYS_DDC, .dpd = 58, .voltage = UINT_MAX }, 1615 { .id = TEGRA_IO_PAD_UART, .dpd = 14, .voltage = UINT_MAX }, 1616 { .id = TEGRA_IO_PAD_USB0, .dpd = 9, .voltage = UINT_MAX }, 1617 { .id = TEGRA_IO_PAD_USB1, .dpd = 10, .voltage = UINT_MAX }, 1618 { .id = TEGRA_IO_PAD_USB2, .dpd = 11, .voltage = UINT_MAX }, 1619 { .id = TEGRA_IO_PAD_USB_BIAS, .dpd = 12, .voltage = UINT_MAX }, 1620 }; 1621 1622 static const struct tegra_pmc_soc tegra124_pmc_soc = { 1623 .num_powergates = ARRAY_SIZE(tegra124_powergates), 1624 .powergates = tegra124_powergates, 1625 .num_cpu_powergates = ARRAY_SIZE(tegra124_cpu_powergates), 1626 .cpu_powergates = tegra124_cpu_powergates, 1627 .has_tsense_reset = true, 1628 .has_gpu_clamps = true, 1629 .num_io_pads = ARRAY_SIZE(tegra124_io_pads), 1630 .io_pads = tegra124_io_pads, 1631 }; 1632 1633 static const char * const tegra210_powergates[] = { 1634 [TEGRA_POWERGATE_CPU] = "crail", 1635 [TEGRA_POWERGATE_3D] = "3d", 1636 [TEGRA_POWERGATE_VENC] = "venc", 1637 [TEGRA_POWERGATE_PCIE] = "pcie", 1638 [TEGRA_POWERGATE_MPE] = "mpe", 1639 [TEGRA_POWERGATE_SATA] = "sata", 1640 [TEGRA_POWERGATE_CPU1] = "cpu1", 1641 [TEGRA_POWERGATE_CPU2] = "cpu2", 1642 [TEGRA_POWERGATE_CPU3] = "cpu3", 1643 [TEGRA_POWERGATE_CPU0] = "cpu0", 1644 [TEGRA_POWERGATE_C0NC] = "c0nc", 1645 [TEGRA_POWERGATE_SOR] = "sor", 1646 [TEGRA_POWERGATE_DIS] = "dis", 1647 [TEGRA_POWERGATE_DISB] = "disb", 1648 [TEGRA_POWERGATE_XUSBA] = "xusba", 1649 [TEGRA_POWERGATE_XUSBB] = "xusbb", 1650 [TEGRA_POWERGATE_XUSBC] = "xusbc", 1651 [TEGRA_POWERGATE_VIC] = "vic", 1652 [TEGRA_POWERGATE_IRAM] = "iram", 1653 [TEGRA_POWERGATE_NVDEC] = "nvdec", 1654 [TEGRA_POWERGATE_NVJPG] = "nvjpg", 1655 [TEGRA_POWERGATE_AUD] = "aud", 1656 [TEGRA_POWERGATE_DFD] = "dfd", 1657 [TEGRA_POWERGATE_VE2] = "ve2", 1658 }; 1659 1660 static const u8 tegra210_cpu_powergates[] = { 1661 TEGRA_POWERGATE_CPU0, 1662 TEGRA_POWERGATE_CPU1, 1663 TEGRA_POWERGATE_CPU2, 1664 TEGRA_POWERGATE_CPU3, 1665 }; 1666 1667 static const struct tegra_io_pad_soc tegra210_io_pads[] = { 1668 { .id = TEGRA_IO_PAD_AUDIO, .dpd = 17, .voltage = 5 }, 1669 { .id = TEGRA_IO_PAD_AUDIO_HV, .dpd = 61, .voltage = 18 }, 1670 { .id = TEGRA_IO_PAD_CAM, .dpd = 36, .voltage = 10 }, 1671 { .id = TEGRA_IO_PAD_CSIA, .dpd = 0, .voltage = UINT_MAX }, 1672 { .id = TEGRA_IO_PAD_CSIB, .dpd = 1, .voltage = UINT_MAX }, 1673 { .id = TEGRA_IO_PAD_CSIC, .dpd = 42, .voltage = UINT_MAX }, 1674 { .id = TEGRA_IO_PAD_CSID, .dpd = 43, .voltage = UINT_MAX }, 1675 { .id = TEGRA_IO_PAD_CSIE, .dpd = 44, .voltage = UINT_MAX }, 1676 { .id = TEGRA_IO_PAD_CSIF, .dpd = 45, .voltage = UINT_MAX }, 1677 { .id = TEGRA_IO_PAD_DBG, .dpd = 25, .voltage = 19 }, 1678 { .id = TEGRA_IO_PAD_DEBUG_NONAO, .dpd = 26, .voltage = UINT_MAX }, 1679 { .id = TEGRA_IO_PAD_DMIC, .dpd = 50, .voltage = 20 }, 1680 { .id = TEGRA_IO_PAD_DP, .dpd = 51, .voltage = UINT_MAX }, 1681 { .id = TEGRA_IO_PAD_DSI, .dpd = 2, .voltage = UINT_MAX }, 1682 { .id = TEGRA_IO_PAD_DSIB, .dpd = 39, .voltage = UINT_MAX }, 1683 { .id = TEGRA_IO_PAD_DSIC, .dpd = 40, .voltage = UINT_MAX }, 1684 { .id = TEGRA_IO_PAD_DSID, .dpd = 41, .voltage = UINT_MAX }, 1685 { .id = TEGRA_IO_PAD_EMMC, .dpd = 35, .voltage = UINT_MAX }, 1686 { .id = TEGRA_IO_PAD_EMMC2, .dpd = 37, .voltage = UINT_MAX }, 1687 { .id = TEGRA_IO_PAD_GPIO, .dpd = 27, .voltage = 21 }, 1688 { .id = TEGRA_IO_PAD_HDMI, .dpd = 28, .voltage = UINT_MAX }, 1689 { .id = TEGRA_IO_PAD_HSIC, .dpd = 19, .voltage = UINT_MAX }, 1690 { .id = TEGRA_IO_PAD_LVDS, .dpd = 57, .voltage = UINT_MAX }, 1691 { .id = TEGRA_IO_PAD_MIPI_BIAS, .dpd = 3, .voltage = UINT_MAX }, 1692 { .id = TEGRA_IO_PAD_PEX_BIAS, .dpd = 4, .voltage = UINT_MAX }, 1693 { .id = TEGRA_IO_PAD_PEX_CLK1, .dpd = 5, .voltage = UINT_MAX }, 1694 { .id = TEGRA_IO_PAD_PEX_CLK2, .dpd = 6, .voltage = UINT_MAX }, 1695 { .id = TEGRA_IO_PAD_PEX_CNTRL, .dpd = UINT_MAX, .voltage = 11 }, 1696 { .id = TEGRA_IO_PAD_SDMMC1, .dpd = 33, .voltage = 12 }, 1697 { .id = TEGRA_IO_PAD_SDMMC3, .dpd = 34, .voltage = 13 }, 1698 { .id = TEGRA_IO_PAD_SPI, .dpd = 46, .voltage = 22 }, 1699 { .id = TEGRA_IO_PAD_SPI_HV, .dpd = 47, .voltage = 23 }, 1700 { .id = TEGRA_IO_PAD_UART, .dpd = 14, .voltage = 2 }, 1701 { .id = TEGRA_IO_PAD_USB0, .dpd = 9, .voltage = UINT_MAX }, 1702 { .id = TEGRA_IO_PAD_USB1, .dpd = 10, .voltage = UINT_MAX }, 1703 { .id = TEGRA_IO_PAD_USB2, .dpd = 11, .voltage = UINT_MAX }, 1704 { .id = TEGRA_IO_PAD_USB3, .dpd = 18, .voltage = UINT_MAX }, 1705 { .id = TEGRA_IO_PAD_USB_BIAS, .dpd = 12, .voltage = UINT_MAX }, 1706 }; 1707 1708 static const struct tegra_pmc_soc tegra210_pmc_soc = { 1709 .num_powergates = ARRAY_SIZE(tegra210_powergates), 1710 .powergates = tegra210_powergates, 1711 .num_cpu_powergates = ARRAY_SIZE(tegra210_cpu_powergates), 1712 .cpu_powergates = tegra210_cpu_powergates, 1713 .has_tsense_reset = true, 1714 .has_gpu_clamps = true, 1715 .num_io_pads = ARRAY_SIZE(tegra210_io_pads), 1716 .io_pads = tegra210_io_pads, 1717 }; 1718 1719 static const struct of_device_id tegra_pmc_match[] = { 1720 { .compatible = "nvidia,tegra210-pmc", .data = &tegra210_pmc_soc }, 1721 { .compatible = "nvidia,tegra132-pmc", .data = &tegra124_pmc_soc }, 1722 { .compatible = "nvidia,tegra124-pmc", .data = &tegra124_pmc_soc }, 1723 { .compatible = "nvidia,tegra114-pmc", .data = &tegra114_pmc_soc }, 1724 { .compatible = "nvidia,tegra30-pmc", .data = &tegra30_pmc_soc }, 1725 { .compatible = "nvidia,tegra20-pmc", .data = &tegra20_pmc_soc }, 1726 { } 1727 }; 1728 1729 static struct platform_driver tegra_pmc_driver = { 1730 .driver = { 1731 .name = "tegra-pmc", 1732 .suppress_bind_attrs = true, 1733 .of_match_table = tegra_pmc_match, 1734 #if defined(CONFIG_PM_SLEEP) && defined(CONFIG_ARM) 1735 .pm = &tegra_pmc_pm_ops, 1736 #endif 1737 }, 1738 .probe = tegra_pmc_probe, 1739 }; 1740 builtin_platform_driver(tegra_pmc_driver); 1741 1742 /* 1743 * Early initialization to allow access to registers in the very early boot 1744 * process. 1745 */ 1746 static int __init tegra_pmc_early_init(void) 1747 { 1748 const struct of_device_id *match; 1749 struct device_node *np; 1750 struct resource regs; 1751 bool invert; 1752 u32 value; 1753 1754 mutex_init(&pmc->powergates_lock); 1755 1756 np = of_find_matching_node_and_match(NULL, tegra_pmc_match, &match); 1757 if (!np) { 1758 /* 1759 * Fall back to legacy initialization for 32-bit ARM only. All 1760 * 64-bit ARM device tree files for Tegra are required to have 1761 * a PMC node. 1762 * 1763 * This is for backwards-compatibility with old device trees 1764 * that didn't contain a PMC node. Note that in this case the 1765 * SoC data can't be matched and therefore powergating is 1766 * disabled. 1767 */ 1768 if (IS_ENABLED(CONFIG_ARM) && soc_is_tegra()) { 1769 pr_warn("DT node not found, powergating disabled\n"); 1770 1771 regs.start = 0x7000e400; 1772 regs.end = 0x7000e7ff; 1773 regs.flags = IORESOURCE_MEM; 1774 1775 pr_warn("Using memory region %pR\n", ®s); 1776 } else { 1777 /* 1778 * At this point we're not running on Tegra, so play 1779 * nice with multi-platform kernels. 1780 */ 1781 return 0; 1782 } 1783 } else { 1784 /* 1785 * Extract information from the device tree if we've found a 1786 * matching node. 1787 */ 1788 if (of_address_to_resource(np, 0, ®s) < 0) { 1789 pr_err("failed to get PMC registers\n"); 1790 of_node_put(np); 1791 return -ENXIO; 1792 } 1793 } 1794 1795 pmc->base = ioremap_nocache(regs.start, resource_size(®s)); 1796 if (!pmc->base) { 1797 pr_err("failed to map PMC registers\n"); 1798 of_node_put(np); 1799 return -ENXIO; 1800 } 1801 1802 if (np) { 1803 pmc->soc = match->data; 1804 1805 tegra_powergate_init(pmc, np); 1806 1807 /* 1808 * Invert the interrupt polarity if a PMC device tree node 1809 * exists and contains the nvidia,invert-interrupt property. 1810 */ 1811 invert = of_property_read_bool(np, "nvidia,invert-interrupt"); 1812 1813 value = tegra_pmc_readl(PMC_CNTRL); 1814 1815 if (invert) 1816 value |= PMC_CNTRL_INTR_POLARITY; 1817 else 1818 value &= ~PMC_CNTRL_INTR_POLARITY; 1819 1820 tegra_pmc_writel(value, PMC_CNTRL); 1821 1822 of_node_put(np); 1823 } 1824 1825 return 0; 1826 } 1827 early_initcall(tegra_pmc_early_init); 1828