1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * 4 * Implementation of primary ALSA driver code base for NVIDIA Tegra HDA. 5 */ 6 7 #include <linux/clk.h> 8 #include <linux/clocksource.h> 9 #include <linux/completion.h> 10 #include <linux/delay.h> 11 #include <linux/dma-mapping.h> 12 #include <linux/init.h> 13 #include <linux/interrupt.h> 14 #include <linux/io.h> 15 #include <linux/kernel.h> 16 #include <linux/module.h> 17 #include <linux/moduleparam.h> 18 #include <linux/mutex.h> 19 #include <linux/of_device.h> 20 #include <linux/reset.h> 21 #include <linux/slab.h> 22 #include <linux/time.h> 23 #include <linux/string.h> 24 #include <linux/pm_runtime.h> 25 26 #include <sound/core.h> 27 #include <sound/initval.h> 28 29 #include <sound/hda_codec.h> 30 #include "hda_controller.h" 31 32 /* Defines for Nvidia Tegra HDA support */ 33 #define HDA_BAR0 0x8000 34 35 #define HDA_CFG_CMD 0x1004 36 #define HDA_CFG_BAR0 0x1010 37 38 #define HDA_ENABLE_IO_SPACE (1 << 0) 39 #define HDA_ENABLE_MEM_SPACE (1 << 1) 40 #define HDA_ENABLE_BUS_MASTER (1 << 2) 41 #define HDA_ENABLE_SERR (1 << 8) 42 #define HDA_DISABLE_INTR (1 << 10) 43 #define HDA_BAR0_INIT_PROGRAM 0xFFFFFFFF 44 #define HDA_BAR0_FINAL_PROGRAM (1 << 14) 45 46 /* IPFS */ 47 #define HDA_IPFS_CONFIG 0x180 48 #define HDA_IPFS_EN_FPCI 0x1 49 50 #define HDA_IPFS_FPCI_BAR0 0x80 51 #define HDA_FPCI_BAR0_START 0x40 52 53 #define HDA_IPFS_INTR_MASK 0x188 54 #define HDA_IPFS_EN_INTR (1 << 16) 55 56 /* FPCI */ 57 #define FPCI_DBG_CFG_2 0x10F4 58 #define FPCI_GCAP_NSDO_SHIFT 18 59 #define FPCI_GCAP_NSDO_MASK (0x3 << FPCI_GCAP_NSDO_SHIFT) 60 61 /* max number of SDs */ 62 #define NUM_CAPTURE_SD 1 63 #define NUM_PLAYBACK_SD 1 64 65 /* 66 * Tegra194 does not reflect correct number of SDO lines. Below macro 67 * is used to update the GCAP register to workaround the issue. 68 */ 69 #define TEGRA194_NUM_SDO_LINES 4 70 71 struct hda_tegra_soc { 72 bool has_hda2codec_2x_reset; 73 bool has_hda2hdmi; 74 }; 75 76 struct hda_tegra { 77 struct azx chip; 78 struct device *dev; 79 struct reset_control_bulk_data resets[3]; 80 struct clk_bulk_data clocks[3]; 81 unsigned int nresets; 82 unsigned int nclocks; 83 void __iomem *regs; 84 struct work_struct probe_work; 85 const struct hda_tegra_soc *soc; 86 }; 87 88 #ifdef CONFIG_PM 89 static int power_save = CONFIG_SND_HDA_POWER_SAVE_DEFAULT; 90 module_param(power_save, bint, 0644); 91 MODULE_PARM_DESC(power_save, 92 "Automatic power-saving timeout (in seconds, 0 = disable)."); 93 #else 94 #define power_save 0 95 #endif 96 97 static const struct hda_controller_ops hda_tegra_ops; /* nothing special */ 98 99 static void hda_tegra_init(struct hda_tegra *hda) 100 { 101 u32 v; 102 103 /* Enable PCI access */ 104 v = readl(hda->regs + HDA_IPFS_CONFIG); 105 v |= HDA_IPFS_EN_FPCI; 106 writel(v, hda->regs + HDA_IPFS_CONFIG); 107 108 /* Enable MEM/IO space and bus master */ 109 v = readl(hda->regs + HDA_CFG_CMD); 110 v &= ~HDA_DISABLE_INTR; 111 v |= HDA_ENABLE_MEM_SPACE | HDA_ENABLE_IO_SPACE | 112 HDA_ENABLE_BUS_MASTER | HDA_ENABLE_SERR; 113 writel(v, hda->regs + HDA_CFG_CMD); 114 115 writel(HDA_BAR0_INIT_PROGRAM, hda->regs + HDA_CFG_BAR0); 116 writel(HDA_BAR0_FINAL_PROGRAM, hda->regs + HDA_CFG_BAR0); 117 writel(HDA_FPCI_BAR0_START, hda->regs + HDA_IPFS_FPCI_BAR0); 118 119 v = readl(hda->regs + HDA_IPFS_INTR_MASK); 120 v |= HDA_IPFS_EN_INTR; 121 writel(v, hda->regs + HDA_IPFS_INTR_MASK); 122 } 123 124 /* 125 * power management 126 */ 127 static int __maybe_unused hda_tegra_suspend(struct device *dev) 128 { 129 struct snd_card *card = dev_get_drvdata(dev); 130 int rc; 131 132 rc = pm_runtime_force_suspend(dev); 133 if (rc < 0) 134 return rc; 135 snd_power_change_state(card, SNDRV_CTL_POWER_D3hot); 136 137 return 0; 138 } 139 140 static int __maybe_unused hda_tegra_resume(struct device *dev) 141 { 142 struct snd_card *card = dev_get_drvdata(dev); 143 int rc; 144 145 rc = pm_runtime_force_resume(dev); 146 if (rc < 0) 147 return rc; 148 snd_power_change_state(card, SNDRV_CTL_POWER_D0); 149 150 return 0; 151 } 152 153 static int __maybe_unused hda_tegra_runtime_suspend(struct device *dev) 154 { 155 struct snd_card *card = dev_get_drvdata(dev); 156 struct azx *chip = card->private_data; 157 struct hda_tegra *hda = container_of(chip, struct hda_tegra, chip); 158 159 if (chip && chip->running) { 160 /* enable controller wake up event */ 161 azx_writew(chip, WAKEEN, azx_readw(chip, WAKEEN) | 162 STATESTS_INT_MASK); 163 164 azx_stop_chip(chip); 165 azx_enter_link_reset(chip); 166 } 167 clk_bulk_disable_unprepare(hda->nclocks, hda->clocks); 168 169 return 0; 170 } 171 172 static int __maybe_unused hda_tegra_runtime_resume(struct device *dev) 173 { 174 struct snd_card *card = dev_get_drvdata(dev); 175 struct azx *chip = card->private_data; 176 struct hda_tegra *hda = container_of(chip, struct hda_tegra, chip); 177 int rc; 178 179 if (!chip->running) { 180 rc = reset_control_bulk_assert(hda->nresets, hda->resets); 181 if (rc) 182 return rc; 183 } 184 185 rc = clk_bulk_prepare_enable(hda->nclocks, hda->clocks); 186 if (rc != 0) 187 return rc; 188 if (chip->running) { 189 hda_tegra_init(hda); 190 azx_init_chip(chip, 1); 191 /* disable controller wake up event*/ 192 azx_writew(chip, WAKEEN, azx_readw(chip, WAKEEN) & 193 ~STATESTS_INT_MASK); 194 } else { 195 usleep_range(10, 100); 196 197 rc = reset_control_bulk_deassert(hda->nresets, hda->resets); 198 if (rc) 199 return rc; 200 } 201 202 return 0; 203 } 204 205 static const struct dev_pm_ops hda_tegra_pm = { 206 SET_SYSTEM_SLEEP_PM_OPS(hda_tegra_suspend, hda_tegra_resume) 207 SET_RUNTIME_PM_OPS(hda_tegra_runtime_suspend, 208 hda_tegra_runtime_resume, 209 NULL) 210 }; 211 212 static int hda_tegra_dev_disconnect(struct snd_device *device) 213 { 214 struct azx *chip = device->device_data; 215 216 chip->bus.shutdown = 1; 217 return 0; 218 } 219 220 /* 221 * destructor 222 */ 223 static int hda_tegra_dev_free(struct snd_device *device) 224 { 225 struct azx *chip = device->device_data; 226 struct hda_tegra *hda = container_of(chip, struct hda_tegra, chip); 227 228 cancel_work_sync(&hda->probe_work); 229 if (azx_bus(chip)->chip_init) { 230 azx_stop_all_streams(chip); 231 azx_stop_chip(chip); 232 } 233 234 azx_free_stream_pages(chip); 235 azx_free_streams(chip); 236 snd_hdac_bus_exit(azx_bus(chip)); 237 238 return 0; 239 } 240 241 static int hda_tegra_init_chip(struct azx *chip, struct platform_device *pdev) 242 { 243 struct hda_tegra *hda = container_of(chip, struct hda_tegra, chip); 244 struct hdac_bus *bus = azx_bus(chip); 245 struct resource *res; 246 247 hda->regs = devm_platform_get_and_ioremap_resource(pdev, 0, &res); 248 if (IS_ERR(hda->regs)) 249 return PTR_ERR(hda->regs); 250 251 bus->remap_addr = hda->regs + HDA_BAR0; 252 bus->addr = res->start + HDA_BAR0; 253 254 hda_tegra_init(hda); 255 256 return 0; 257 } 258 259 static int hda_tegra_first_init(struct azx *chip, struct platform_device *pdev) 260 { 261 struct hda_tegra *hda = container_of(chip, struct hda_tegra, chip); 262 struct hdac_bus *bus = azx_bus(chip); 263 struct snd_card *card = chip->card; 264 int err; 265 unsigned short gcap; 266 int irq_id = platform_get_irq(pdev, 0); 267 const char *sname, *drv_name = "tegra-hda"; 268 struct device_node *np = pdev->dev.of_node; 269 270 if (irq_id < 0) 271 return irq_id; 272 273 err = hda_tegra_init_chip(chip, pdev); 274 if (err) 275 return err; 276 277 err = devm_request_irq(chip->card->dev, irq_id, azx_interrupt, 278 IRQF_SHARED, KBUILD_MODNAME, chip); 279 if (err) { 280 dev_err(chip->card->dev, 281 "unable to request IRQ %d, disabling device\n", 282 irq_id); 283 return err; 284 } 285 bus->irq = irq_id; 286 bus->dma_stop_delay = 100; 287 card->sync_irq = bus->irq; 288 289 /* 290 * Tegra194 has 4 SDO lines and the STRIPE can be used to 291 * indicate how many of the SDO lines the stream should be 292 * striped. But GCAP register does not reflect the true 293 * capability of HW. Below workaround helps to fix this. 294 * 295 * GCAP_NSDO is bits 19:18 in T_AZA_DBG_CFG_2, 296 * 0 for 1 SDO, 1 for 2 SDO, 2 for 4 SDO lines. 297 */ 298 if (of_device_is_compatible(np, "nvidia,tegra194-hda")) { 299 u32 val; 300 301 dev_info(card->dev, "Override SDO lines to %u\n", 302 TEGRA194_NUM_SDO_LINES); 303 304 val = readl(hda->regs + FPCI_DBG_CFG_2) & ~FPCI_GCAP_NSDO_MASK; 305 val |= (TEGRA194_NUM_SDO_LINES >> 1) << FPCI_GCAP_NSDO_SHIFT; 306 writel(val, hda->regs + FPCI_DBG_CFG_2); 307 } 308 309 gcap = azx_readw(chip, GCAP); 310 dev_dbg(card->dev, "chipset global capabilities = 0x%x\n", gcap); 311 312 chip->align_buffer_size = 1; 313 314 /* read number of streams from GCAP register instead of using 315 * hardcoded value 316 */ 317 chip->capture_streams = (gcap >> 8) & 0x0f; 318 319 /* The GCAP register on Tegra234 implies no Input Streams(ISS) support, 320 * but the HW output stream descriptor programming should start with 321 * offset 0x20*4 from base stream descriptor address. This will be a 322 * problem while calculating the offset for output stream descriptor 323 * which will be considering input stream also. So here output stream 324 * starts with offset 0 which is wrong as HW register for output stream 325 * offset starts with 4. 326 */ 327 if (of_device_is_compatible(np, "nvidia,tegra234-hda")) 328 chip->capture_streams = 4; 329 330 chip->playback_streams = (gcap >> 12) & 0x0f; 331 if (!chip->playback_streams && !chip->capture_streams) { 332 /* gcap didn't give any info, switching to old method */ 333 chip->playback_streams = NUM_PLAYBACK_SD; 334 chip->capture_streams = NUM_CAPTURE_SD; 335 } 336 chip->capture_index_offset = 0; 337 chip->playback_index_offset = chip->capture_streams; 338 chip->num_streams = chip->playback_streams + chip->capture_streams; 339 340 /* initialize streams */ 341 err = azx_init_streams(chip); 342 if (err < 0) { 343 dev_err(card->dev, "failed to initialize streams: %d\n", err); 344 return err; 345 } 346 347 err = azx_alloc_stream_pages(chip); 348 if (err < 0) { 349 dev_err(card->dev, "failed to allocate stream pages: %d\n", 350 err); 351 return err; 352 } 353 354 /* initialize chip */ 355 azx_init_chip(chip, 1); 356 357 /* 358 * Playback (for 44.1K/48K, 2-channel, 16-bps) fails with 359 * 4 SDO lines due to legacy design limitation. Following 360 * is, from HD Audio Specification (Revision 1.0a), used to 361 * control striping of the stream across multiple SDO lines 362 * for sample rates <= 48K. 363 * 364 * { ((num_channels * bits_per_sample) / number of SDOs) >= 8 } 365 * 366 * Due to legacy design issue it is recommended that above 367 * ratio must be greater than 8. Since number of SDO lines is 368 * in powers of 2, next available ratio is 16 which can be 369 * used as a limiting factor here. 370 */ 371 if (of_device_is_compatible(np, "nvidia,tegra30-hda")) 372 chip->bus.core.sdo_limit = 16; 373 374 /* codec detection */ 375 if (!bus->codec_mask) { 376 dev_err(card->dev, "no codecs found!\n"); 377 return -ENODEV; 378 } 379 380 /* driver name */ 381 strncpy(card->driver, drv_name, sizeof(card->driver)); 382 /* shortname for card */ 383 sname = of_get_property(np, "nvidia,model", NULL); 384 if (!sname) 385 sname = drv_name; 386 if (strlen(sname) > sizeof(card->shortname)) 387 dev_info(card->dev, "truncating shortname for card\n"); 388 strncpy(card->shortname, sname, sizeof(card->shortname)); 389 390 /* longname for card */ 391 snprintf(card->longname, sizeof(card->longname), 392 "%s at 0x%lx irq %i", 393 card->shortname, bus->addr, bus->irq); 394 395 return 0; 396 } 397 398 /* 399 * constructor 400 */ 401 402 static void hda_tegra_probe_work(struct work_struct *work); 403 404 static int hda_tegra_create(struct snd_card *card, 405 unsigned int driver_caps, 406 struct hda_tegra *hda) 407 { 408 static const struct snd_device_ops ops = { 409 .dev_disconnect = hda_tegra_dev_disconnect, 410 .dev_free = hda_tegra_dev_free, 411 }; 412 struct azx *chip; 413 int err; 414 415 chip = &hda->chip; 416 417 mutex_init(&chip->open_mutex); 418 chip->card = card; 419 chip->ops = &hda_tegra_ops; 420 chip->driver_caps = driver_caps; 421 chip->driver_type = driver_caps & 0xff; 422 chip->dev_index = 0; 423 INIT_LIST_HEAD(&chip->pcm_list); 424 425 chip->codec_probe_mask = -1; 426 427 chip->single_cmd = false; 428 chip->snoop = true; 429 430 INIT_WORK(&hda->probe_work, hda_tegra_probe_work); 431 432 err = azx_bus_init(chip, NULL); 433 if (err < 0) 434 return err; 435 436 chip->bus.core.sync_write = 0; 437 chip->bus.core.needs_damn_long_delay = 1; 438 chip->bus.core.aligned_mmio = 1; 439 440 err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops); 441 if (err < 0) { 442 dev_err(card->dev, "Error creating device\n"); 443 return err; 444 } 445 446 return 0; 447 } 448 449 static const struct hda_tegra_soc tegra30_data = { 450 .has_hda2codec_2x_reset = true, 451 .has_hda2hdmi = true, 452 }; 453 454 static const struct hda_tegra_soc tegra194_data = { 455 .has_hda2codec_2x_reset = false, 456 .has_hda2hdmi = true, 457 }; 458 459 static const struct hda_tegra_soc tegra234_data = { 460 .has_hda2codec_2x_reset = true, 461 .has_hda2hdmi = false, 462 }; 463 464 static const struct of_device_id hda_tegra_match[] = { 465 { .compatible = "nvidia,tegra30-hda", .data = &tegra30_data }, 466 { .compatible = "nvidia,tegra194-hda", .data = &tegra194_data }, 467 { .compatible = "nvidia,tegra234-hda", .data = &tegra234_data }, 468 {}, 469 }; 470 MODULE_DEVICE_TABLE(of, hda_tegra_match); 471 472 static int hda_tegra_probe(struct platform_device *pdev) 473 { 474 const unsigned int driver_flags = AZX_DCAPS_CORBRP_SELF_CLEAR | 475 AZX_DCAPS_PM_RUNTIME; 476 struct snd_card *card; 477 struct azx *chip; 478 struct hda_tegra *hda; 479 int err; 480 481 hda = devm_kzalloc(&pdev->dev, sizeof(*hda), GFP_KERNEL); 482 if (!hda) 483 return -ENOMEM; 484 hda->dev = &pdev->dev; 485 chip = &hda->chip; 486 487 hda->soc = of_device_get_match_data(&pdev->dev); 488 489 err = snd_card_new(&pdev->dev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1, 490 THIS_MODULE, 0, &card); 491 if (err < 0) { 492 dev_err(&pdev->dev, "Error creating card!\n"); 493 return err; 494 } 495 496 hda->resets[hda->nresets++].id = "hda"; 497 498 /* 499 * "hda2hdmi" is not applicable for Tegra234. This is because the 500 * codec is separate IP and not under display SOR partition now. 501 */ 502 if (hda->soc->has_hda2hdmi) 503 hda->resets[hda->nresets++].id = "hda2hdmi"; 504 505 /* 506 * "hda2codec_2x" reset is not present on Tegra194. Though DT would 507 * be updated to reflect this, but to have backward compatibility 508 * below is necessary. 509 */ 510 if (hda->soc->has_hda2codec_2x_reset) 511 hda->resets[hda->nresets++].id = "hda2codec_2x"; 512 513 err = devm_reset_control_bulk_get_exclusive(&pdev->dev, hda->nresets, 514 hda->resets); 515 if (err) 516 goto out_free; 517 518 hda->clocks[hda->nclocks++].id = "hda"; 519 if (hda->soc->has_hda2hdmi) 520 hda->clocks[hda->nclocks++].id = "hda2hdmi"; 521 hda->clocks[hda->nclocks++].id = "hda2codec_2x"; 522 523 err = devm_clk_bulk_get(&pdev->dev, hda->nclocks, hda->clocks); 524 if (err < 0) 525 goto out_free; 526 527 err = hda_tegra_create(card, driver_flags, hda); 528 if (err < 0) 529 goto out_free; 530 card->private_data = chip; 531 532 dev_set_drvdata(&pdev->dev, card); 533 534 pm_runtime_enable(hda->dev); 535 if (!azx_has_pm_runtime(chip)) 536 pm_runtime_forbid(hda->dev); 537 538 schedule_work(&hda->probe_work); 539 540 return 0; 541 542 out_free: 543 snd_card_free(card); 544 return err; 545 } 546 547 static void hda_tegra_probe_work(struct work_struct *work) 548 { 549 struct hda_tegra *hda = container_of(work, struct hda_tegra, probe_work); 550 struct azx *chip = &hda->chip; 551 struct platform_device *pdev = to_platform_device(hda->dev); 552 int err; 553 554 pm_runtime_get_sync(hda->dev); 555 err = hda_tegra_first_init(chip, pdev); 556 if (err < 0) 557 goto out_free; 558 559 /* create codec instances */ 560 err = azx_probe_codecs(chip, 8); 561 if (err < 0) 562 goto out_free; 563 564 err = azx_codec_configure(chip); 565 if (err < 0) 566 goto out_free; 567 568 err = snd_card_register(chip->card); 569 if (err < 0) 570 goto out_free; 571 572 chip->running = 1; 573 snd_hda_set_power_save(&chip->bus, power_save * 1000); 574 575 out_free: 576 pm_runtime_put(hda->dev); 577 return; /* no error return from async probe */ 578 } 579 580 static int hda_tegra_remove(struct platform_device *pdev) 581 { 582 int ret; 583 584 ret = snd_card_free(dev_get_drvdata(&pdev->dev)); 585 pm_runtime_disable(&pdev->dev); 586 587 return ret; 588 } 589 590 static void hda_tegra_shutdown(struct platform_device *pdev) 591 { 592 struct snd_card *card = dev_get_drvdata(&pdev->dev); 593 struct azx *chip; 594 595 if (!card) 596 return; 597 chip = card->private_data; 598 if (chip && chip->running) 599 azx_stop_chip(chip); 600 } 601 602 static struct platform_driver tegra_platform_hda = { 603 .driver = { 604 .name = "tegra-hda", 605 .pm = &hda_tegra_pm, 606 .of_match_table = hda_tegra_match, 607 }, 608 .probe = hda_tegra_probe, 609 .remove = hda_tegra_remove, 610 .shutdown = hda_tegra_shutdown, 611 }; 612 module_platform_driver(tegra_platform_hda); 613 614 MODULE_DESCRIPTION("Tegra HDA bus driver"); 615 MODULE_LICENSE("GPL v2"); 616