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
 170         dev_dbg(bus->dev, "in %s\n", __func__);
 171
 172         /* enable controller wake up event */
 173         snd_hdac_chip_updatew(bus, WAKEEN, 0, STATESTS_INT_MASK);
 174
 175         snd_hdac_bus_stop_chip(bus);
 176         snd_hdac_bus_enter_link_reset(bus);
 177
 178         return 0;
 179 }
 180
 181 static int skl_runtime_resume(struct device *dev)
 182 {
 183         struct pci_dev *pci = to_pci_dev(dev);
 184         struct hdac_ext_bus *ebus = pci_get_drvdata(pci);
 185         struct hdac_bus *bus = ebus_to_hbus(ebus);
 186         struct skl *hda = ebus_to_skl(ebus);
 187         int status;
 188
 189         dev_dbg(bus->dev, "in %s\n", __func__);
 190
 191         /* Read STATESTS before controller reset */
 192         status = snd_hdac_chip_readw(bus, STATESTS);
 193
 194         skl_init_pci(hda);
 195         snd_hdac_bus_init_chip(bus, true);
 196         /* disable controller Wake Up event */
 197         snd_hdac_chip_updatew(bus, WAKEEN, STATESTS_INT_MASK, 0);
 198
 199         return 0;
 200 }
 201 #endif /* CONFIG_PM */
 202
 203 static const struct dev_pm_ops skl_pm = {
 204         SET_SYSTEM_SLEEP_PM_OPS(skl_suspend, skl_resume)
 205         SET_RUNTIME_PM_OPS(skl_runtime_suspend, skl_runtime_resume, NULL)
 206 };
 207
 208 /*
 209  * destructor
 210  */
 211 static int skl_free(struct hdac_ext_bus *ebus)
 212 {
 213         struct skl *skl  = ebus_to_skl(ebus);
 214         struct hdac_bus *bus = ebus_to_hbus(ebus);
 215
 216         skl->init_failed = 1; /* to be sure */
 217
 218         snd_hdac_ext_stop_streams(ebus);
 219
 220         if (bus->irq >= 0)
 221                 free_irq(bus->irq, (void *)bus);
 222         if (bus->remap_addr)
 223                 iounmap(bus->remap_addr);
 224
 225         snd_hdac_bus_free_stream_pages(bus);
 226         snd_hdac_stream_free_all(ebus);
 227         snd_hdac_link_free_all(ebus);
 228         pci_release_regions(skl->pci);
 229         pci_disable_device(skl->pci);
 230
 231         snd_hdac_ext_bus_exit(ebus);
 232
 233         return 0;
 234 }
 235
 236 static int skl_dmic_device_register(struct skl *skl)
 237 {
 238         struct hdac_bus *bus = ebus_to_hbus(&skl->ebus);
 239         struct platform_device *pdev;
 240         int ret;
 241
 242         /* SKL has one dmic port, so allocate dmic device for this */
 243         pdev = platform_device_alloc("dmic-codec", -1);
 244         if (!pdev) {
 245                 dev_err(bus->dev, "failed to allocate dmic device\n");
 246                 return -ENOMEM;
 247         }
 248
 249         ret = platform_device_add(pdev);
 250         if (ret) {
 251                 dev_err(bus->dev, "failed to add dmic device: %d\n", ret);
 252                 platform_device_put(pdev);
 253                 return ret;
 254         }
 255         skl->dmic_dev = pdev;
 256
 257         return 0;
 258 }
 259
 260 static void skl_dmic_device_unregister(struct skl *skl)
 261 {
 262         if (skl->dmic_dev)
 263                 platform_device_unregister(skl->dmic_dev);
 264 }
 265
 266 /*
 267  * Probe the given codec address
 268  */
 269 static int probe_codec(struct hdac_ext_bus *ebus, int addr)
 270 {
 271         struct hdac_bus *bus = ebus_to_hbus(ebus);
 272         unsigned int cmd = (addr << 28) | (AC_NODE_ROOT << 20) |
 273                 (AC_VERB_PARAMETERS << 8) | AC_PAR_VENDOR_ID;
 274         unsigned int res;
 275
 276         mutex_lock(&bus->cmd_mutex);
 277         snd_hdac_bus_send_cmd(bus, cmd);
 278         snd_hdac_bus_get_response(bus, addr, &res);
 279         mutex_unlock(&bus->cmd_mutex);
 280         if (res == -1)
 281                 return -EIO;
 282         dev_dbg(bus->dev, "codec #%d probed OK\n", addr);
 283
 284         return snd_hdac_ext_bus_device_init(ebus, addr);
 285 }
 286
 287 /* Codec initialization */
 288 static int skl_codec_create(struct hdac_ext_bus *ebus)
 289 {
 290         struct hdac_bus *bus = ebus_to_hbus(ebus);
 291         int c, max_slots;
 292
 293         max_slots = HDA_MAX_CODECS;
 294
 295         /* First try to probe all given codec slots */
 296         for (c = 0; c < max_slots; c++) {
 297                 if ((bus->codec_mask & (1 << c))) {
 298                         if (probe_codec(ebus, c) < 0) {
 299                                 /*
 300                                  * Some BIOSen give you wrong codec addresses
 301                                  * that don't exist
 302                                  */
 303                                 dev_warn(bus->dev,
 304                                          "Codec #%d probe error; disabling it...\n", c);
 305                                 bus->codec_mask &= ~(1 << c);
 306                                 /*
 307                                  * More badly, accessing to a non-existing
 308                                  * codec often screws up the controller bus,
 309                                  * and disturbs the further communications.
 310                                  * Thus if an error occurs during probing,
 311                                  * better to reset the controller bus to get
 312                                  * back to the sanity state.
 313                                  */
 314                                 snd_hdac_bus_stop_chip(bus);
 315                                 snd_hdac_bus_init_chip(bus, true);
 316                         }
 317                 }
 318         }
 319
 320         return 0;
 321 }
 322
 323 static const struct hdac_bus_ops bus_core_ops = {
 324         .command = snd_hdac_bus_send_cmd,
 325         .get_response = snd_hdac_bus_get_response,
 326 };
 327
 328 /*
 329  * constructor
 330  */
 331 static int skl_create(struct pci_dev *pci,
 332                       const struct hdac_io_ops *io_ops,
 333                       struct skl **rskl)
 334 {
 335         struct skl *skl;
 336         struct hdac_ext_bus *ebus;
 337
 338         int err;
 339
 340         *rskl = NULL;
 341
 342         err = pci_enable_device(pci);
 343         if (err < 0)
 344                 return err;
 345
 346         skl = devm_kzalloc(&pci->dev, sizeof(*skl), GFP_KERNEL);
 347         if (!skl) {
 348                 pci_disable_device(pci);
 349                 return -ENOMEM;
 350         }
 351         ebus = &skl->ebus;
 352         snd_hdac_ext_bus_init(ebus, &pci->dev, &bus_core_ops, io_ops);
 353         ebus->bus.use_posbuf = 1;
 354         skl->pci = pci;
 355
 356         ebus->bus.bdl_pos_adj = 0;
 357
 358         *rskl = skl;
 359
 360         return 0;
 361 }
 362
 363 static int skl_first_init(struct hdac_ext_bus *ebus)
 364 {
 365         struct skl *skl = ebus_to_skl(ebus);
 366         struct hdac_bus *bus = ebus_to_hbus(ebus);
 367         struct pci_dev *pci = skl->pci;
 368         int err;
 369         unsigned short gcap;
 370         int cp_streams, pb_streams, start_idx;
 371
 372         err = pci_request_regions(pci, "Skylake HD audio");
 373         if (err < 0)
 374                 return err;
 375
 376         bus->addr = pci_resource_start(pci, 0);
 377         bus->remap_addr = pci_ioremap_bar(pci, 0);
 378         if (bus->remap_addr == NULL) {
 379                 dev_err(bus->dev, "ioremap error\n");
 380                 return -ENXIO;
 381         }
 382
 383         snd_hdac_ext_bus_parse_capabilities(ebus);
 384
 385         if (skl_acquire_irq(ebus, 0) < 0)
 386                 return -EBUSY;
 387
 388         pci_set_master(pci);
 389         synchronize_irq(bus->irq);
 390
 391         gcap = snd_hdac_chip_readw(bus, GCAP);
 392         dev_dbg(bus->dev, "chipset global capabilities = 0x%x\n", gcap);
 393
 394         /* allow 64bit DMA address if supported by H/W */
 395         if (!dma_set_mask(bus->dev, DMA_BIT_MASK(64))) {
 396                 dma_set_coherent_mask(bus->dev, DMA_BIT_MASK(64));
 397         } else {
 398                 dma_set_mask(bus->dev, DMA_BIT_MASK(32));
 399                 dma_set_coherent_mask(bus->dev, DMA_BIT_MASK(32));
 400         }
 401
 402         /* read number of streams from GCAP register */
 403         cp_streams = (gcap >> 8) & 0x0f;
 404         pb_streams = (gcap >> 12) & 0x0f;
 405
 406         if (!pb_streams && !cp_streams)
 407                 return -EIO;
 408
 409         ebus->num_streams = cp_streams + pb_streams;
 410
 411         /* initialize streams */
 412         snd_hdac_ext_stream_init_all
 413                 (ebus, 0, cp_streams, SNDRV_PCM_STREAM_CAPTURE);
 414         start_idx = cp_streams;
 415         snd_hdac_ext_stream_init_all
 416                 (ebus, start_idx, pb_streams, SNDRV_PCM_STREAM_PLAYBACK);
 417
 418         err = snd_hdac_bus_alloc_stream_pages(bus);
 419         if (err < 0)
 420                 return err;
 421
 422         /* initialize chip */
 423         skl_init_pci(skl);
 424
 425         snd_hdac_bus_init_chip(bus, true);
 426
 427         /* codec detection */
 428         if (!bus->codec_mask) {
 429                 dev_err(bus->dev, "no codecs found!\n");
 430                 return -ENODEV;
 431         }
 432
 433         return 0;
 434 }
 435
 436 static int skl_probe(struct pci_dev *pci,
 437                      const struct pci_device_id *pci_id)
 438 {
 439         struct skl *skl;
 440         struct hdac_ext_bus *ebus = NULL;
 441         struct hdac_bus *bus = NULL;
 442         int err;
 443
 444         /* we use ext core ops, so provide NULL for ops here */
 445         err = skl_create(pci, NULL, &skl);
 446         if (err < 0)
 447                 return err;
 448
 449         ebus = &skl->ebus;
 450         bus = ebus_to_hbus(ebus);
 451
 452         err = skl_first_init(ebus);
 453         if (err < 0)
 454                 goto out_free;
 455
 456         pci_set_drvdata(skl->pci, ebus);
 457
 458         /* check if dsp is there */
 459         if (ebus->ppcap) {
 460                 /* TODO register with dsp IPC */
 461                 dev_dbg(bus->dev, "Register dsp\n");
 462         }
 463
 464         if (ebus->mlcap)
 465                 snd_hdac_ext_bus_get_ml_capabilities(ebus);
 466
 467         /* create device for soc dmic */
 468         err = skl_dmic_device_register(skl);
 469         if (err < 0)
 470                 goto out_free;
 471
 472         /* register platform dai and controls */
 473         err = skl_platform_register(bus->dev);
 474         if (err < 0)
 475                 goto out_dmic_free;
 476
 477         /* create codec instances */
 478         err = skl_codec_create(ebus);
 479         if (err < 0)
 480                 goto out_unregister;
 481
 482         /*configure PM */
 483         pm_runtime_set_autosuspend_delay(bus->dev, SKL_SUSPEND_DELAY);
 484         pm_runtime_use_autosuspend(bus->dev);
 485         pm_runtime_put_noidle(bus->dev);
 486         pm_runtime_allow(bus->dev);
 487
 488         return 0;
 489
 490 out_unregister:
 491         skl_platform_unregister(bus->dev);
 492 out_dmic_free:
 493         skl_dmic_device_unregister(skl);
 494 out_free:
 495         skl->init_failed = 1;
 496         skl_free(ebus);
 497
 498         return err;
 499 }
 500
 501 static void skl_remove(struct pci_dev *pci)
 502 {
 503         struct hdac_ext_bus *ebus = pci_get_drvdata(pci);
 504         struct skl *skl = ebus_to_skl(ebus);
 505
 506         if (pci_dev_run_wake(pci))
 507                 pm_runtime_get_noresume(&pci->dev);
 508         pci_dev_put(pci);
 509         skl_platform_unregister(&pci->dev);
 510         skl_dmic_device_unregister(skl);
 511         skl_free(ebus);
 512         dev_set_drvdata(&pci->dev, NULL);
 513 }
 514
 515 /* PCI IDs */
 516 static const struct pci_device_id skl_ids[] = {
 517         /* Sunrise Point-LP */
 518         { PCI_DEVICE(0x8086, 0x9d70), 0},
 519         { 0, }
 520 };
 521 MODULE_DEVICE_TABLE(pci, skl_ids);
 522
 523 /* pci_driver definition */
 524 static struct pci_driver skl_driver = {
 525         .name = KBUILD_MODNAME,
 526         .id_table = skl_ids,
 527         .probe = skl_probe,
 528         .remove = skl_remove,
 529         .driver = {
 530                 .pm = &skl_pm,
 531         },
 532 };
 533 module_pci_driver(skl_driver);
 534
 535 MODULE_LICENSE("GPL v2");
 536 MODULE_DESCRIPTION("Intel Skylake ASoC HDA driver");