kernel/sound/pci/hda/hda_tegra.c

   1 /*
   2  *
   3  * Implementation of primary ALSA driver code base for NVIDIA Tegra HDA.
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms and conditions of the GNU General Public License,
   7  * version 2, as published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  12  * more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  16  *
  17  */
  18
  19 #include <linux/clk.h>
  20 #include <linux/clocksource.h>
  21 #include <linux/completion.h>
  22 #include <linux/delay.h>
  23 #include <linux/dma-mapping.h>
  24 #include <linux/init.h>
  25 #include <linux/interrupt.h>
  26 #include <linux/io.h>
  27 #include <linux/kernel.h>
  28 #include <linux/module.h>
  29 #include <linux/moduleparam.h>
  30 #include <linux/mutex.h>
  31 #include <linux/of_device.h>
  32 #include <linux/slab.h>
  33 #include <linux/time.h>
  34
  35 #include <sound/core.h>
  36 #include <sound/initval.h>
  37
  38 #include "hda_codec.h"
  39 #include "hda_controller.h"
  40
  41 /* Defines for Nvidia Tegra HDA support */
  42 #define HDA_BAR0           0x8000
  43
  44 #define HDA_CFG_CMD        0x1004
  45 #define HDA_CFG_BAR0       0x1010
  46
  47 #define HDA_ENABLE_IO_SPACE       (1 << 0)
  48 #define HDA_ENABLE_MEM_SPACE      (1 << 1)
  49 #define HDA_ENABLE_BUS_MASTER     (1 << 2)
  50 #define HDA_ENABLE_SERR           (1 << 8)
  51 #define HDA_DISABLE_INTR          (1 << 10)
  52 #define HDA_BAR0_INIT_PROGRAM     0xFFFFFFFF
  53 #define HDA_BAR0_FINAL_PROGRAM    (1 << 14)
  54
  55 /* IPFS */
  56 #define HDA_IPFS_CONFIG           0x180
  57 #define HDA_IPFS_EN_FPCI          0x1
  58
  59 #define HDA_IPFS_FPCI_BAR0        0x80
  60 #define HDA_FPCI_BAR0_START       0x40
  61
  62 #define HDA_IPFS_INTR_MASK        0x188
  63 #define HDA_IPFS_EN_INTR          (1 << 16)
  64
  65 /* max number of SDs */
  66 #define NUM_CAPTURE_SD 1
  67 #define NUM_PLAYBACK_SD 1
  68
  69 struct hda_tegra {
  70         struct azx chip;
  71         struct device *dev;
  72         struct clk *hda_clk;
  73         struct clk *hda2codec_2x_clk;
  74         struct clk *hda2hdmi_clk;
  75         void __iomem *regs;
  76 };
  77
  78 #ifdef CONFIG_PM
  79 static int power_save = CONFIG_SND_HDA_POWER_SAVE_DEFAULT;
  80 module_param(power_save, bint, 0644);
  81 MODULE_PARM_DESC(power_save,
  82                  "Automatic power-saving timeout (in seconds, 0 = disable).");
  83 #else
  84 #define power_save      0
  85 #endif
  86
  87 /*
  88  * DMA page allocation ops.
  89  */
  90 static int dma_alloc_pages(struct azx *chip, int type, size_t size,
  91                            struct snd_dma_buffer *buf)
  92 {
  93         return snd_dma_alloc_pages(type, chip->card->dev, size, buf);
  94 }
  95
  96 static void dma_free_pages(struct azx *chip, struct snd_dma_buffer *buf)
  97 {
  98         snd_dma_free_pages(buf);
  99 }
 100
 101 static int substream_alloc_pages(struct azx *chip,
 102                                  struct snd_pcm_substream *substream,
 103                                  size_t size)
 104 {
 105         struct azx_dev *azx_dev = get_azx_dev(substream);
 106
 107         azx_dev->bufsize = 0;
 108         azx_dev->period_bytes = 0;
 109         azx_dev->format_val = 0;
 110         return snd_pcm_lib_malloc_pages(substream, size);
 111 }
 112
 113 static int substream_free_pages(struct azx *chip,
 114                                 struct snd_pcm_substream *substream)
 115 {
 116         return snd_pcm_lib_free_pages(substream);
 117 }
 118
 119 /*
 120  * Register access ops. Tegra HDA register access is DWORD only.
 121  */
 122 static void hda_tegra_writel(u32 value, u32 *addr)
 123 {
 124         writel(value, addr);
 125 }
 126
 127 static u32 hda_tegra_readl(u32 *addr)
 128 {
 129         return readl(addr);
 130 }
 131
 132 static void hda_tegra_writew(u16 value, u16 *addr)
 133 {
 134         unsigned int shift = ((unsigned long)(addr) & 0x3) << 3;
 135         void *dword_addr = (void *)((unsigned long)(addr) & ~0x3);
 136         u32 v;
 137
 138         v = readl(dword_addr);
 139         v &= ~(0xffff << shift);
 140         v |= value << shift;
 141         writel(v, dword_addr);
 142 }
 143
 144 static u16 hda_tegra_readw(u16 *addr)
 145 {
 146         unsigned int shift = ((unsigned long)(addr) & 0x3) << 3;
 147         void *dword_addr = (void *)((unsigned long)(addr) & ~0x3);
 148         u32 v;
 149
 150         v = readl(dword_addr);
 151         return (v >> shift) & 0xffff;
 152 }
 153
 154 static void hda_tegra_writeb(u8 value, u8 *addr)
 155 {
 156         unsigned int shift = ((unsigned long)(addr) & 0x3) << 3;
 157         void *dword_addr = (void *)((unsigned long)(addr) & ~0x3);
 158         u32 v;
 159
 160         v = readl(dword_addr);
 161         v &= ~(0xff << shift);
 162         v |= value << shift;
 163         writel(v, dword_addr);
 164 }
 165
 166 static u8 hda_tegra_readb(u8 *addr)
 167 {
 168         unsigned int shift = ((unsigned long)(addr) & 0x3) << 3;
 169         void *dword_addr = (void *)((unsigned long)(addr) & ~0x3);
 170         u32 v;
 171
 172         v = readl(dword_addr);
 173         return (v >> shift) & 0xff;
 174 }
 175
 176 static const struct hda_controller_ops hda_tegra_ops = {
 177         .reg_writel = hda_tegra_writel,
 178         .reg_readl = hda_tegra_readl,
 179         .reg_writew = hda_tegra_writew,
 180         .reg_readw = hda_tegra_readw,
 181         .reg_writeb = hda_tegra_writeb,
 182         .reg_readb = hda_tegra_readb,
 183         .dma_alloc_pages = dma_alloc_pages,
 184         .dma_free_pages = dma_free_pages,
 185         .substream_alloc_pages = substream_alloc_pages,
 186         .substream_free_pages = substream_free_pages,
 187 };
 188
 189 static void hda_tegra_init(struct hda_tegra *hda)
 190 {
 191         u32 v;
 192
 193         /* Enable PCI access */
 194         v = readl(hda->regs + HDA_IPFS_CONFIG);
 195         v |= HDA_IPFS_EN_FPCI;
 196         writel(v, hda->regs + HDA_IPFS_CONFIG);
 197
 198         /* Enable MEM/IO space and bus master */
 199         v = readl(hda->regs + HDA_CFG_CMD);
 200         v &= ~HDA_DISABLE_INTR;
 201         v |= HDA_ENABLE_MEM_SPACE | HDA_ENABLE_IO_SPACE |
 202                 HDA_ENABLE_BUS_MASTER | HDA_ENABLE_SERR;
 203         writel(v, hda->regs + HDA_CFG_CMD);
 204
 205         writel(HDA_BAR0_INIT_PROGRAM, hda->regs + HDA_CFG_BAR0);
 206         writel(HDA_BAR0_FINAL_PROGRAM, hda->regs + HDA_CFG_BAR0);
 207         writel(HDA_FPCI_BAR0_START, hda->regs + HDA_IPFS_FPCI_BAR0);
 208
 209         v = readl(hda->regs + HDA_IPFS_INTR_MASK);
 210         v |= HDA_IPFS_EN_INTR;
 211         writel(v, hda->regs + HDA_IPFS_INTR_MASK);
 212 }
 213
 214 static int hda_tegra_enable_clocks(struct hda_tegra *data)
 215 {
 216         int rc;
 217
 218         rc = clk_prepare_enable(data->hda_clk);
 219         if (rc)
 220                 return rc;
 221         rc = clk_prepare_enable(data->hda2codec_2x_clk);
 222         if (rc)
 223                 goto disable_hda;
 224         rc = clk_prepare_enable(data->hda2hdmi_clk);
 225         if (rc)
 226                 goto disable_codec_2x;
 227
 228         return 0;
 229
 230 disable_codec_2x:
 231         clk_disable_unprepare(data->hda2codec_2x_clk);
 232 disable_hda:
 233         clk_disable_unprepare(data->hda_clk);
 234         return rc;
 235 }
 236
 237 #ifdef CONFIG_PM_SLEEP
 238 static void hda_tegra_disable_clocks(struct hda_tegra *data)
 239 {
 240         clk_disable_unprepare(data->hda2hdmi_clk);
 241         clk_disable_unprepare(data->hda2codec_2x_clk);
 242         clk_disable_unprepare(data->hda_clk);
 243 }
 244
 245 /*
 246  * power management
 247  */
 248 static int hda_tegra_suspend(struct device *dev)
 249 {
 250         struct snd_card *card = dev_get_drvdata(dev);
 251         struct azx *chip = card->private_data;
 252         struct hda_tegra *hda = container_of(chip, struct hda_tegra, chip);
 253
 254         snd_power_change_state(card, SNDRV_CTL_POWER_D3hot);
 255
 256         azx_stop_chip(chip);
 257         azx_enter_link_reset(chip);
 258         hda_tegra_disable_clocks(hda);
 259
 260         return 0;
 261 }
 262
 263 static int hda_tegra_resume(struct device *dev)
 264 {
 265         struct snd_card *card = dev_get_drvdata(dev);
 266         struct azx *chip = card->private_data;
 267         struct hda_tegra *hda = container_of(chip, struct hda_tegra, chip);
 268
 269         hda_tegra_enable_clocks(hda);
 270
 271         hda_tegra_init(hda);
 272
 273         azx_init_chip(chip, 1);
 274
 275         snd_power_change_state(card, SNDRV_CTL_POWER_D0);
 276
 277         return 0;
 278 }
 279 #endif /* CONFIG_PM_SLEEP */
 280
 281 static const struct dev_pm_ops hda_tegra_pm = {
 282         SET_SYSTEM_SLEEP_PM_OPS(hda_tegra_suspend, hda_tegra_resume)
 283 };
 284
 285 /*
 286  * destructor
 287  */
 288 static int hda_tegra_dev_free(struct snd_device *device)
 289 {
 290         int i;
 291         struct azx *chip = device->device_data;
 292
 293         if (chip->initialized) {
 294                 for (i = 0; i < chip->num_streams; i++)
 295                         azx_stream_stop(chip, &chip->azx_dev[i]);
 296                 azx_stop_chip(chip);
 297         }
 298
 299         azx_free_stream_pages(chip);
 300
 301         return 0;
 302 }
 303
 304 static int hda_tegra_init_chip(struct azx *chip, struct platform_device *pdev)
 305 {
 306         struct hda_tegra *hda = container_of(chip, struct hda_tegra, chip);
 307         struct device *dev = hda->dev;
 308         struct resource *res;
 309         int err;
 310
 311         hda->hda_clk = devm_clk_get(dev, "hda");
 312         if (IS_ERR(hda->hda_clk))
 313                 return PTR_ERR(hda->hda_clk);
 314         hda->hda2codec_2x_clk = devm_clk_get(dev, "hda2codec_2x");
 315         if (IS_ERR(hda->hda2codec_2x_clk))
 316                 return PTR_ERR(hda->hda2codec_2x_clk);
 317         hda->hda2hdmi_clk = devm_clk_get(dev, "hda2hdmi");
 318         if (IS_ERR(hda->hda2hdmi_clk))
 319                 return PTR_ERR(hda->hda2hdmi_clk);
 320
 321         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 322         hda->regs = devm_ioremap_resource(dev, res);
 323         if (IS_ERR(hda->regs))
 324                 return PTR_ERR(hda->regs);
 325
 326         chip->remap_addr = hda->regs + HDA_BAR0;
 327         chip->addr = res->start + HDA_BAR0;
 328
 329         err = hda_tegra_enable_clocks(hda);
 330         if (err)
 331                 return err;
 332
 333         hda_tegra_init(hda);
 334
 335         return 0;
 336 }
 337
 338 static int hda_tegra_first_init(struct azx *chip, struct platform_device *pdev)
 339 {
 340         struct snd_card *card = chip->card;
 341         int err;
 342         unsigned short gcap;
 343         int irq_id = platform_get_irq(pdev, 0);
 344
 345         err = hda_tegra_init_chip(chip, pdev);
 346         if (err)
 347                 return err;
 348
 349         err = devm_request_irq(chip->card->dev, irq_id, azx_interrupt,
 350                              IRQF_SHARED, KBUILD_MODNAME, chip);
 351         if (err) {
 352                 dev_err(chip->card->dev,
 353                         "unable to request IRQ %d, disabling device\n",
 354                         irq_id);
 355                 return err;
 356         }
 357         chip->irq = irq_id;
 358
 359         synchronize_irq(chip->irq);
 360
 361         gcap = azx_readw(chip, GCAP);
 362         dev_dbg(card->dev, "chipset global capabilities = 0x%x\n", gcap);
 363
 364         /* read number of streams from GCAP register instead of using
 365          * hardcoded value
 366          */
 367         chip->capture_streams = (gcap >> 8) & 0x0f;
 368         chip->playback_streams = (gcap >> 12) & 0x0f;
 369         if (!chip->playback_streams && !chip->capture_streams) {
 370                 /* gcap didn't give any info, switching to old method */
 371                 chip->playback_streams = NUM_PLAYBACK_SD;
 372                 chip->capture_streams = NUM_CAPTURE_SD;
 373         }
 374         chip->capture_index_offset = 0;
 375         chip->playback_index_offset = chip->capture_streams;
 376         chip->num_streams = chip->playback_streams + chip->capture_streams;
 377         chip->azx_dev = devm_kcalloc(card->dev, chip->num_streams,
 378                                      sizeof(*chip->azx_dev), GFP_KERNEL);
 379         if (!chip->azx_dev)
 380                 return -ENOMEM;
 381
 382         err = azx_alloc_stream_pages(chip);
 383         if (err < 0)
 384                 return err;
 385
 386         /* initialize streams */
 387         azx_init_stream(chip);
 388
 389         /* initialize chip */
 390         azx_init_chip(chip, 1);
 391
 392         /* codec detection */
 393         if (!chip->codec_mask) {
 394                 dev_err(card->dev, "no codecs found!\n");
 395                 return -ENODEV;
 396         }
 397
 398         strcpy(card->driver, "tegra-hda");
 399         strcpy(card->shortname, "tegra-hda");
 400         snprintf(card->longname, sizeof(card->longname),
 401                  "%s at 0x%lx irq %i",
 402                  card->shortname, chip->addr, chip->irq);
 403
 404         return 0;
 405 }
 406
 407 /*
 408  * constructor
 409  */
 410 static int hda_tegra_create(struct snd_card *card,
 411                             unsigned int driver_caps,
 412                             const struct hda_controller_ops *hda_ops,
 413                             struct hda_tegra *hda)
 414 {
 415         static struct snd_device_ops ops = {
 416                 .dev_free = hda_tegra_dev_free,
 417         };
 418         struct azx *chip;
 419         int err;
 420
 421         chip = &hda->chip;
 422
 423         spin_lock_init(&chip->reg_lock);
 424         mutex_init(&chip->open_mutex);
 425         chip->card = card;
 426         chip->ops = hda_ops;
 427         chip->irq = -1;
 428         chip->driver_caps = driver_caps;
 429         chip->driver_type = driver_caps & 0xff;
 430         chip->dev_index = 0;
 431         INIT_LIST_HEAD(&chip->pcm_list);
 432
 433         chip->codec_probe_mask = -1;
 434
 435         chip->single_cmd = false;
 436         chip->snoop = true;
 437
 438         err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops);
 439         if (err < 0) {
 440                 dev_err(card->dev, "Error creating device\n");
 441                 return err;
 442         }
 443
 444         return 0;
 445 }
 446
 447 static const struct of_device_id hda_tegra_match[] = {
 448         { .compatible = "nvidia,tegra30-hda" },
 449         {},
 450 };
 451 MODULE_DEVICE_TABLE(of, hda_tegra_match);
 452
 453 static int hda_tegra_probe(struct platform_device *pdev)
 454 {
 455         struct snd_card *card;
 456         struct azx *chip;
 457         struct hda_tegra *hda;
 458         int err;
 459         const unsigned int driver_flags = AZX_DCAPS_RIRB_DELAY;
 460
 461         hda = devm_kzalloc(&pdev->dev, sizeof(*hda), GFP_KERNEL);
 462         if (!hda)
 463                 return -ENOMEM;
 464         hda->dev = &pdev->dev;
 465         chip = &hda->chip;
 466
 467         err = snd_card_new(&pdev->dev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1,
 468                            THIS_MODULE, 0, &card);
 469         if (err < 0) {
 470                 dev_err(&pdev->dev, "Error creating card!\n");
 471                 return err;
 472         }
 473
 474         err = hda_tegra_create(card, driver_flags, &hda_tegra_ops, hda);
 475         if (err < 0)
 476                 goto out_free;
 477         card->private_data = chip;
 478
 479         dev_set_drvdata(&pdev->dev, card);
 480
 481         err = hda_tegra_first_init(chip, pdev);
 482         if (err < 0)
 483                 goto out_free;
 484
 485         /* create codec instances */
 486         err = azx_bus_create(chip, NULL);
 487         if (err < 0)
 488                 goto out_free;
 489
 490         err = azx_probe_codecs(chip, 0);
 491         if (err < 0)
 492                 goto out_free;
 493
 494         err = azx_codec_configure(chip);
 495         if (err < 0)
 496                 goto out_free;
 497
 498         err = snd_card_register(chip->card);
 499         if (err < 0)
 500                 goto out_free;
 501
 502         chip->running = 1;
 503         snd_hda_set_power_save(chip->bus, power_save * 1000);
 504
 505         return 0;
 506
 507 out_free:
 508         snd_card_free(card);
 509         return err;
 510 }
 511
 512 static int hda_tegra_remove(struct platform_device *pdev)
 513 {
 514         return snd_card_free(dev_get_drvdata(&pdev->dev));
 515 }
 516
 517 static void hda_tegra_shutdown(struct platform_device *pdev)
 518 {
 519         struct snd_card *card = dev_get_drvdata(&pdev->dev);
 520         struct azx *chip;
 521
 522         if (!card)
 523                 return;
 524         chip = card->private_data;
 525         if (chip && chip->running)
 526                 azx_stop_chip(chip);
 527 }
 528
 529 static struct platform_driver tegra_platform_hda = {
 530         .driver = {
 531                 .name = "tegra-hda",
 532                 .pm = &hda_tegra_pm,
 533                 .of_match_table = hda_tegra_match,
 534         },
 535         .probe = hda_tegra_probe,
 536         .remove = hda_tegra_remove,
 537         .shutdown = hda_tegra_shutdown,
 538 };
 539 module_platform_driver(tegra_platform_hda);
 540
 541 MODULE_DESCRIPTION("Tegra HDA bus driver");
 542 MODULE_LICENSE("GPL v2");