sound/soc/intel/skylake/skl.c

   1 /*
   2  *  skl.c - Implementation of ASoC Intel SKL HD Audio driver
   3  *
   4  *  Copyright (C) 2014-2015 Intel Corp
   5  *  Author: Jeeja KP <jeeja.kp@intel.com>
   6  *
   7  *  Derived mostly from Intel HDA driver with following copyrights:
   8  *  Copyright (c) 2004 Takashi Iwai <tiwai@suse.de>
   9  *                     PeiSen Hou <pshou@realtek.com.tw>
  10  *  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  11  *
  12  *  This program is free software; you can redistribute it and/or modify
  13  *  it under the terms of the GNU General Public License as published by
  14  *  the Free Software Foundation; version 2 of the License.
  15  *
  16  *  This program is distributed in the hope that it will be useful, but
  17  *  WITHOUT ANY WARRANTY; without even the implied warranty of
  18  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  19  *  General Public License for more details.
  20  *
  21  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  22  */
  23
  24 #include <linux/module.h>
  25 #include <linux/pci.h>
  26 #include <linux/pm_runtime.h>
  27 #include <linux/platform_device.h>
  28 #include <sound/pcm.h>
  29 #include "skl.h"
  30
  31 /*
  32  * initialize the PCI registers
  33  */
  34 static void skl_update_pci_byte(struct pci_dev *pci, unsigned int reg,
  35                             unsigned char mask, unsigned char val)
  36 {
  37         unsigned char data;
  38
  39         pci_read_config_byte(pci, reg, &data);
  40         data &= ~mask;
  41         data |= (val & mask);
  42         pci_write_config_byte(pci, reg, data);
  43 }
  44
  45 static void skl_init_pci(struct skl *skl)
  46 {
  47         struct hdac_ext_bus *ebus = &skl->ebus;
  48
  49         /*
  50          * Clear bits 0-2 of PCI register TCSEL (at offset 0x44)
  51          * TCSEL == Traffic Class Select Register, which sets PCI express QOS
  52          * Ensuring these bits are 0 clears playback static on some HD Audio
  53          * codecs.
  54          * The PCI register TCSEL is defined in the Intel manuals.
  55          */
  56         dev_dbg(ebus_to_hbus(ebus)->dev, "Clearing TCSEL\n");
  57         skl_update_pci_byte(skl->pci, AZX_PCIREG_TCSEL, 0x07, 0);
  58 }
  59
  60 /* called from IRQ */
  61 static void skl_stream_update(struct hdac_bus *bus, struct hdac_stream *hstr)
  62 {
  63         snd_pcm_period_elapsed(hstr->substream);
  64 }
  65
  66 static irqreturn_t skl_interrupt(int irq, void *dev_id)
  67 {
  68         struct hdac_ext_bus *ebus = dev_id;
  69         struct hdac_bus *bus = ebus_to_hbus(ebus);
  70         u32 status;
  71
  72         if (!pm_runtime_active(bus->dev))
  73                 return IRQ_NONE;
  74
  75         spin_lock(&bus->reg_lock);
  76
  77         status = snd_hdac_chip_readl(bus, INTSTS);
  78         if (status == 0 || status == 0xffffffff) {
  79                 spin_unlock(&bus->reg_lock);
  80                 return IRQ_NONE;
  81         }
  82
  83         /* clear rirb int */
  84         status = snd_hdac_chip_readb(bus, RIRBSTS);
  85         if (status & RIRB_INT_MASK) {
  86                 if (status & RIRB_INT_RESPONSE)
  87                         snd_hdac_bus_update_rirb(bus);
  88                 snd_hdac_chip_writeb(bus, RIRBSTS, RIRB_INT_MASK);
  89         }
  90
  91         spin_unlock(&bus->reg_lock);
  92
  93         return snd_hdac_chip_readl(bus, INTSTS) ? IRQ_WAKE_THREAD : IRQ_HANDLED;
  94 }
  95
  96 static irqreturn_t skl_threaded_handler(int irq, void *dev_id)
  97 {
  98         struct hdac_ext_bus *ebus = dev_id;
  99         struct hdac_bus *bus = ebus_to_hbus(ebus);
 100         u32 status;
 101
 102         status = snd_hdac_chip_readl(bus, INTSTS);
 103
 104         snd_hdac_bus_handle_stream_irq(bus, status, skl_stream_update);
 105
 106         return IRQ_HANDLED;
 107 }
 108
 109 static int skl_acquire_irq(struct hdac_ext_bus *ebus, int do_disconnect)
 110 {
 111         struct skl *skl = ebus_to_skl(ebus);
 112         struct hdac_bus *bus = ebus_to_hbus(ebus);
 113         int ret;
 114
 115         ret = request_threaded_irq(skl->pci->irq, skl_interrupt,
 116                         skl_threaded_handler,
 117                         IRQF_SHARED,
 118                         KBUILD_MODNAME, ebus);
 119         if (ret) {
 120                 dev_err(bus->dev,
 121                         "unable to grab IRQ %d, disabling device\n",
 122                         skl->pci->irq);
 123                 return ret;
 124         }
 125
 126         bus->irq = skl->pci->irq;
 127         pci_intx(skl->pci, 1);
 128
 129         return 0;
 130 }
 131
 132 #ifdef CONFIG_PM_SLEEP
 133 /*
 134  * power management
 135  */
 136 static int skl_suspend(struct device *dev)
 137 {
 138         struct pci_dev *pci = to_pci_dev(dev);
 139         struct hdac_ext_bus *ebus = pci_get_drvdata(pci);
 140         struct hdac_bus *bus = ebus_to_hbus(ebus);
 141
 142         snd_hdac_bus_stop_chip(bus);
 143         snd_hdac_bus_enter_link_reset(bus);
 144
 145         return 0;
 146 }
 147
 148 static int skl_resume(struct device *dev)
 149 {
 150         struct pci_dev *pci = to_pci_dev(dev);
 151         struct hdac_ext_bus *ebus = pci_get_drvdata(pci);
 152         struct hdac_bus *bus = ebus_to_hbus(ebus);
 153         struct skl *hda = ebus_to_skl(ebus);
 154
 155         skl_init_pci(hda);
 156
 157         snd_hdac_bus_init_chip(bus, 1);
 158
 159         return 0;
 160 }
 161 #endif /* CONFIG_PM_SLEEP */
 162
 163 #ifdef CONFIG_PM
 164 static int skl_runtime_suspend(struct device *dev)
 165 {
 166         struct pci_dev *pci = to_pci_dev(dev);
 167         struct hdac_ext_bus *ebus = pci_get_drvdata(pci);
 168         struct hdac_bus *bus = ebus_to_hbus(ebus);
 169         struct skl *skl = ebus_to_skl(ebus);
 170         int ret;
 171
 172         dev_dbg(bus->dev, "in %s\n", __func__);
 173
 174         /* enable controller wake up event */
 175         snd_hdac_chip_updatew(bus, WAKEEN, 0, STATESTS_INT_MASK);
 176
 177         snd_hdac_ext_bus_link_power_down_all(ebus);
 178
 179         ret = skl_suspend_dsp(skl);
 180         if (ret < 0)
 181                 return ret;
 182
 183         snd_hdac_bus_stop_chip(bus);
 184         snd_hdac_bus_enter_link_reset(bus);
 185
 186         return 0;
 187 }
 188
 189 static int skl_runtime_resume(struct device *dev)
 190 {
 191         struct pci_dev *pci = to_pci_dev(dev);
 192         struct hdac_ext_bus *ebus = pci_get_drvdata(pci);
 193         struct hdac_bus *bus = ebus_to_hbus(ebus);
 194         struct skl *skl = ebus_to_skl(ebus);
 195         int status;
 196
 197         dev_dbg(bus->dev, "in %s\n", __func__);
 198
 199         /* Read STATESTS before controller reset */
 200         status = snd_hdac_chip_readw(bus, STATESTS);
 201
 202         skl_init_pci(skl);
 203         snd_hdac_bus_init_chip(bus, true);
 204         /* disable controller Wake Up event */
 205         snd_hdac_chip_updatew(bus, WAKEEN, STATESTS_INT_MASK, 0);
 206
 207         return skl_resume_dsp(skl);
 208 }
 209 #endif /* CONFIG_PM */
 210
 211 static const struct dev_pm_ops skl_pm = {
 212         SET_SYSTEM_SLEEP_PM_OPS(skl_suspend, skl_resume)
 213         SET_RUNTIME_PM_OPS(skl_runtime_suspend, skl_runtime_resume, NULL)
 214 };
 215
 216 /*
 217  * destructor
 218  */
 219 static int skl_free(struct hdac_ext_bus *ebus)
 220 {
 221         struct skl *skl  = ebus_to_skl(ebus);
 222         struct hdac_bus *bus = ebus_to_hbus(ebus);
 223
 224         skl->init_failed = 1; /* to be sure */
 225
 226         snd_hdac_ext_stop_streams(ebus);
 227
 228         if (bus->irq >= 0)
 229                 free_irq(bus->irq, (void *)bus);
 230         if (bus->remap_addr)
 231                 iounmap(bus->remap_addr);
 232
 233         snd_hdac_bus_free_stream_pages(bus);
 234         snd_hdac_stream_free_all(ebus);
 235         snd_hdac_link_free_all(ebus);
 236         pci_release_regions(skl->pci);
 237         pci_disable_device(skl->pci);
 238
 239         snd_hdac_ext_bus_exit(ebus);
 240
 241         return 0;
 242 }
 243
 244 static int skl_dmic_device_register(struct skl *skl)
 245 {
 246         struct hdac_bus *bus = ebus_to_hbus(&skl->ebus);
 247         struct platform_device *pdev;
 248         int ret;
 249
 250         /* SKL has one dmic port, so allocate dmic device for this */
 251         pdev = platform_device_alloc("dmic-codec", -1);
 252         if (!pdev) {
 253                 dev_err(bus->dev, "failed to allocate dmic device\n");
 254                 return -ENOMEM;
 255         }
 256
 257         ret = platform_device_add(pdev);
 258         if (ret) {
 259                 dev_err(bus->dev, "failed to add dmic device: %d\n", ret);
 260                 platform_device_put(pdev);
 261                 return ret;
 262         }
 263         skl->dmic_dev = pdev;
 264
 265         return 0;
 266 }
 267
 268 static void skl_dmic_device_unregister(struct skl *skl)
 269 {
 270         if (skl->dmic_dev)
 271                 platform_device_unregister(skl->dmic_dev);
 272 }
 273
 274 /*
 275  * Probe the given codec address
 276  */
 277 static int probe_codec(struct hdac_ext_bus *ebus, int addr)
 278 {
 279         struct hdac_bus *bus = ebus_to_hbus(ebus);
 280         unsigned int cmd = (addr << 28) | (AC_NODE_ROOT << 20) |
 281                 (AC_VERB_PARAMETERS << 8) | AC_PAR_VENDOR_ID;
 282         unsigned int res;
 283
 284         mutex_lock(&bus->cmd_mutex);
 285         snd_hdac_bus_send_cmd(bus, cmd);
 286         snd_hdac_bus_get_response(bus, addr, &res);
 287         mutex_unlock(&bus->cmd_mutex);
 288         if (res == -1)
 289                 return -EIO;
 290         dev_dbg(bus->dev, "codec #%d probed OK\n", addr);
 291
 292         return snd_hdac_ext_bus_device_init(ebus, addr);
 293 }
 294
 295 /* Codec initialization */
 296 static int skl_codec_create(struct hdac_ext_bus *ebus)
 297 {
 298         struct hdac_bus *bus = ebus_to_hbus(ebus);
 299         int c, max_slots;
 300
 301         max_slots = HDA_MAX_CODECS;
 302
 303         /* First try to probe all given codec slots */
 304         for (c = 0; c < max_slots; c++) {
 305                 if ((bus->codec_mask & (1 << c))) {
 306                         if (probe_codec(ebus, c) < 0) {
 307                                 /*
 308                                  * Some BIOSen give you wrong codec addresses
 309                                  * that don't exist
 310                                  */
 311                                 dev_warn(bus->dev,
 312                                          "Codec #%d probe error; disabling it...\n", c);
 313                                 bus->codec_mask &= ~(1 << c);
 314                                 /*
 315                                  * More badly, accessing to a non-existing
 316                                  * codec often screws up the controller bus,
 317                                  * and disturbs the further communications.
 318                                  * Thus if an error occurs during probing,
 319                                  * better to reset the controller bus to get
 320                                  * back to the sanity state.
 321                                  */
 322                                 snd_hdac_bus_stop_chip(bus);
 323                                 snd_hdac_bus_init_chip(bus, true);
 324                         }
 325                 }
 326         }
 327
 328         return 0;
 329 }
 330
 331 static const struct hdac_bus_ops bus_core_ops = {
 332         .command = snd_hdac_bus_send_cmd,
 333         .get_response = snd_hdac_bus_get_response,
 334 };
 335
 336 /*
 337  * constructor
 338  */
 339 static int skl_create(struct pci_dev *pci,
 340                       const struct hdac_io_ops *io_ops,
 341                       struct skl **rskl)
 342 {
 343         struct skl *skl;
 344         struct hdac_ext_bus *ebus;
 345
 346         int err;
 347
 348         *rskl = NULL;
 349
 350         err = pci_enable_device(pci);
 351         if (err < 0)
 352                 return err;
 353
 354         skl = devm_kzalloc(&pci->dev, sizeof(*skl), GFP_KERNEL);
 355         if (!skl) {
 356                 pci_disable_device(pci);
 357                 return -ENOMEM;
 358         }
 359         ebus = &skl->ebus;
 360         snd_hdac_ext_bus_init(ebus, &pci->dev, &bus_core_ops, io_ops);
 361         ebus->bus.use_posbuf = 1;
 362         skl->pci = pci;
 363
 364         ebus->bus.bdl_pos_adj = 0;
 365
 366         *rskl = skl;
 367
 368         return 0;
 369 }
 370
 371 static int skl_first_init(struct hdac_ext_bus *ebus)
 372 {
 373         struct skl *skl = ebus_to_skl(ebus);
 374         struct hdac_bus *bus = ebus_to_hbus(ebus);
 375         struct pci_dev *pci = skl->pci;
 376         int err;
 377         unsigned short gcap;
 378         int cp_streams, pb_streams, start_idx;
 379
 380         err = pci_request_regions(pci, "Skylake HD audio");
 381         if (err < 0)
 382                 return err;
 383
 384         bus->addr = pci_resource_start(pci, 0);
 385         bus->remap_addr = pci_ioremap_bar(pci, 0);
 386         if (bus->remap_addr == NULL) {
 387                 dev_err(bus->dev, "ioremap error\n");
 388                 return -ENXIO;
 389         }
 390
 391         snd_hdac_ext_bus_parse_capabilities(ebus);
 392
 393         if (skl_acquire_irq(ebus, 0) < 0)
 394                 return -EBUSY;
 395
 396         pci_set_master(pci);
 397         synchronize_irq(bus->irq);
 398
 399         gcap = snd_hdac_chip_readw(bus, GCAP);
 400         dev_dbg(bus->dev, "chipset global capabilities = 0x%x\n", gcap);
 401
 402         /* allow 64bit DMA address if supported by H/W */
 403         if (!dma_set_mask(bus->dev, DMA_BIT_MASK(64))) {
 404                 dma_set_coherent_mask(bus->dev, DMA_BIT_MASK(64));
 405         } else {
 406                 dma_set_mask(bus->dev, DMA_BIT_MASK(32));
 407                 dma_set_coherent_mask(bus->dev, DMA_BIT_MASK(32));
 408         }
 409
 410         /* read number of streams from GCAP register */
 411         cp_streams = (gcap >> 8) & 0x0f;
 412         pb_streams = (gcap >> 12) & 0x0f;
 413
 414         if (!pb_streams && !cp_streams)
 415                 return -EIO;
 416
 417         ebus->num_streams = cp_streams + pb_streams;
 418
 419         /* initialize streams */
 420         snd_hdac_ext_stream_init_all
 421                 (ebus, 0, cp_streams, SNDRV_PCM_STREAM_CAPTURE);
 422         start_idx = cp_streams;
 423         snd_hdac_ext_stream_init_all
 424                 (ebus, start_idx, pb_streams, SNDRV_PCM_STREAM_PLAYBACK);
 425
 426         err = snd_hdac_bus_alloc_stream_pages(bus);
 427         if (err < 0)
 428                 return err;
 429
 430         /* initialize chip */
 431         skl_init_pci(skl);
 432
 433         snd_hdac_bus_init_chip(bus, true);
 434
 435         /* codec detection */
 436         if (!bus->codec_mask) {
 437                 dev_err(bus->dev, "no codecs found!\n");
 438                 return -ENODEV;
 439         }
 440
 441         return 0;
 442 }
 443
 444 static int skl_probe(struct pci_dev *pci,
 445                      const struct pci_device_id *pci_id)
 446 {
 447         struct skl *skl;
 448         struct hdac_ext_bus *ebus = NULL;
 449         struct hdac_bus *bus = NULL;
 450         int err;
 451
 452         /* we use ext core ops, so provide NULL for ops here */
 453         err = skl_create(pci, NULL, &skl);
 454         if (err < 0)
 455                 return err;
 456
 457         ebus = &skl->ebus;
 458         bus = ebus_to_hbus(ebus);
 459
 460         err = skl_first_init(ebus);
 461         if (err < 0)
 462                 goto out_free;
 463
 464         skl->nhlt = skl_nhlt_init(bus->dev);
 465
 466         if (skl->nhlt == NULL)
 467                 goto out_free;
 468
 469         pci_set_drvdata(skl->pci, ebus);
 470
 471         /* check if dsp is there */
 472         if (ebus->ppcap) {
 473                 err = skl_init_dsp(skl);
 474                 if (err < 0) {
 475                         dev_dbg(bus->dev, "error failed to register dsp\n");
 476                         goto out_free;
 477                 }
 478         }
 479         if (ebus->mlcap)
 480                 snd_hdac_ext_bus_get_ml_capabilities(ebus);
 481
 482         /* create device for soc dmic */
 483         err = skl_dmic_device_register(skl);
 484         if (err < 0)
 485                 goto out_dsp_free;
 486
 487         /* register platform dai and controls */
 488         err = skl_platform_register(bus->dev);
 489         if (err < 0)
 490                 goto out_dmic_free;
 491
 492         /* create codec instances */
 493         err = skl_codec_create(ebus);
 494         if (err < 0)
 495                 goto out_unregister;
 496
 497         /*configure PM */
 498         pm_runtime_set_autosuspend_delay(bus->dev, SKL_SUSPEND_DELAY);
 499         pm_runtime_use_autosuspend(bus->dev);
 500         pm_runtime_put_noidle(bus->dev);
 501         pm_runtime_allow(bus->dev);
 502
 503         return 0;
 504
 505 out_unregister:
 506         skl_platform_unregister(bus->dev);
 507 out_dmic_free:
 508         skl_dmic_device_unregister(skl);
 509 out_dsp_free:
 510         skl_free_dsp(skl);
 511 out_free:
 512         skl->init_failed = 1;
 513         skl_free(ebus);
 514
 515         return err;
 516 }
 517
 518 static void skl_remove(struct pci_dev *pci)
 519 {
 520         struct hdac_ext_bus *ebus = pci_get_drvdata(pci);
 521         struct skl *skl = ebus_to_skl(ebus);
 522
 523         if (pci_dev_run_wake(pci))
 524                 pm_runtime_get_noresume(&pci->dev);
 525         pci_dev_put(pci);
 526         skl_platform_unregister(&pci->dev);
 527         skl_free_dsp(skl);
 528         skl_dmic_device_unregister(skl);
 529         skl_free(ebus);
 530         dev_set_drvdata(&pci->dev, NULL);
 531 }
 532
 533 /* PCI IDs */
 534 static const struct pci_device_id skl_ids[] = {
 535         /* Sunrise Point-LP */
 536         { PCI_DEVICE(0x8086, 0x9d70), 0},
 537         { 0, }
 538 };
 539 MODULE_DEVICE_TABLE(pci, skl_ids);
 540
 541 /* pci_driver definition */
 542 static struct pci_driver skl_driver = {
 543         .name = KBUILD_MODNAME,
 544         .id_table = skl_ids,
 545         .probe = skl_probe,
 546         .remove = skl_remove,
 547         .driver = {
 548                 .pm = &skl_pm,
 549         },
 550 };
 551 module_pci_driver(skl_driver);
 552
 553 MODULE_LICENSE("GPL v2");
 554 MODULE_DESCRIPTION("Intel Skylake ASoC HDA driver");