kernel/sound/hda/hdac_controller.c

   1 /*
   2  * HD-audio controller helpers
   3  */
   4
   5 #include <linux/kernel.h>
   6 #include <linux/delay.h>
   7 #include <linux/export.h>
   8 #include <sound/core.h>
   9 #include <sound/hdaudio.h>
  10 #include <sound/hda_register.h>
  11
  12 /* clear CORB read pointer properly */
  13 static void azx_clear_corbrp(struct hdac_bus *bus)
  14 {
  15         int timeout;
  16
  17         for (timeout = 1000; timeout > 0; timeout--) {
  18                 if (snd_hdac_chip_readw(bus, CORBRP) & AZX_CORBRP_RST)
  19                         break;
  20                 udelay(1);
  21         }
  22         if (timeout <= 0)
  23                 dev_err(bus->dev, "CORB reset timeout#1, CORBRP = %d\n",
  24                         snd_hdac_chip_readw(bus, CORBRP));
  25
  26         snd_hdac_chip_writew(bus, CORBRP, 0);
  27         for (timeout = 1000; timeout > 0; timeout--) {
  28                 if (snd_hdac_chip_readw(bus, CORBRP) == 0)
  29                         break;
  30                 udelay(1);
  31         }
  32         if (timeout <= 0)
  33                 dev_err(bus->dev, "CORB reset timeout#2, CORBRP = %d\n",
  34                         snd_hdac_chip_readw(bus, CORBRP));
  35 }
  36
  37 /**
  38  * snd_hdac_bus_init_cmd_io - set up CORB/RIRB buffers
  39  * @bus: HD-audio core bus
  40  */
  41 void snd_hdac_bus_init_cmd_io(struct hdac_bus *bus)
  42 {
  43         spin_lock_irq(&bus->reg_lock);
  44         /* CORB set up */
  45         bus->corb.addr = bus->rb.addr;
  46         bus->corb.buf = (__le32 *)bus->rb.area;
  47         snd_hdac_chip_writel(bus, CORBLBASE, (u32)bus->corb.addr);
  48         snd_hdac_chip_writel(bus, CORBUBASE, upper_32_bits(bus->corb.addr));
  49
  50         /* set the corb size to 256 entries (ULI requires explicitly) */
  51         snd_hdac_chip_writeb(bus, CORBSIZE, 0x02);
  52         /* set the corb write pointer to 0 */
  53         snd_hdac_chip_writew(bus, CORBWP, 0);
  54
  55         /* reset the corb hw read pointer */
  56         snd_hdac_chip_writew(bus, CORBRP, AZX_CORBRP_RST);
  57         if (!bus->corbrp_self_clear)
  58                 azx_clear_corbrp(bus);
  59
  60         /* enable corb dma */
  61         snd_hdac_chip_writeb(bus, CORBCTL, AZX_CORBCTL_RUN);
  62
  63         /* RIRB set up */
  64         bus->rirb.addr = bus->rb.addr + 2048;
  65         bus->rirb.buf = (__le32 *)(bus->rb.area + 2048);
  66         bus->rirb.wp = bus->rirb.rp = 0;
  67         memset(bus->rirb.cmds, 0, sizeof(bus->rirb.cmds));
  68         snd_hdac_chip_writel(bus, RIRBLBASE, (u32)bus->rirb.addr);
  69         snd_hdac_chip_writel(bus, RIRBUBASE, upper_32_bits(bus->rirb.addr));
  70
  71         /* set the rirb size to 256 entries (ULI requires explicitly) */
  72         snd_hdac_chip_writeb(bus, RIRBSIZE, 0x02);
  73         /* reset the rirb hw write pointer */
  74         snd_hdac_chip_writew(bus, RIRBWP, AZX_RIRBWP_RST);
  75         /* set N=1, get RIRB response interrupt for new entry */
  76         snd_hdac_chip_writew(bus, RINTCNT, 1);
  77         /* enable rirb dma and response irq */
  78         snd_hdac_chip_writeb(bus, RIRBCTL, AZX_RBCTL_DMA_EN | AZX_RBCTL_IRQ_EN);
  79         spin_unlock_irq(&bus->reg_lock);
  80 }
  81 EXPORT_SYMBOL_GPL(snd_hdac_bus_init_cmd_io);
  82
  83 /**
  84  * snd_hdac_bus_stop_cmd_io - clean up CORB/RIRB buffers
  85  * @bus: HD-audio core bus
  86  */
  87 void snd_hdac_bus_stop_cmd_io(struct hdac_bus *bus)
  88 {
  89         spin_lock_irq(&bus->reg_lock);
  90         /* disable ringbuffer DMAs */
  91         snd_hdac_chip_writeb(bus, RIRBCTL, 0);
  92         snd_hdac_chip_writeb(bus, CORBCTL, 0);
  93         /* disable unsolicited responses */
  94         snd_hdac_chip_updatel(bus, GCTL, AZX_GCTL_UNSOL, 0);
  95         spin_unlock_irq(&bus->reg_lock);
  96 }
  97 EXPORT_SYMBOL_GPL(snd_hdac_bus_stop_cmd_io);
  98
  99 static unsigned int azx_command_addr(u32 cmd)
 100 {
 101         unsigned int addr = cmd >> 28;
 102
 103         if (snd_BUG_ON(addr >= HDA_MAX_CODECS))
 104                 addr = 0;
 105         return addr;
 106 }
 107
 108 /**
 109  * snd_hdac_bus_send_cmd - send a command verb via CORB
 110  * @bus: HD-audio core bus
 111  * @val: encoded verb value to send
 112  *
 113  * Returns zero for success or a negative error code.
 114  */
 115 int snd_hdac_bus_send_cmd(struct hdac_bus *bus, unsigned int val)
 116 {
 117         unsigned int addr = azx_command_addr(val);
 118         unsigned int wp, rp;
 119
 120         spin_lock_irq(&bus->reg_lock);
 121
 122         bus->last_cmd[azx_command_addr(val)] = val;
 123
 124         /* add command to corb */
 125         wp = snd_hdac_chip_readw(bus, CORBWP);
 126         if (wp == 0xffff) {
 127                 /* something wrong, controller likely turned to D3 */
 128                 spin_unlock_irq(&bus->reg_lock);
 129                 return -EIO;
 130         }
 131         wp++;
 132         wp %= AZX_MAX_CORB_ENTRIES;
 133
 134         rp = snd_hdac_chip_readw(bus, CORBRP);
 135         if (wp == rp) {
 136                 /* oops, it's full */
 137                 spin_unlock_irq(&bus->reg_lock);
 138                 return -EAGAIN;
 139         }
 140
 141         bus->rirb.cmds[addr]++;
 142         bus->corb.buf[wp] = cpu_to_le32(val);
 143         snd_hdac_chip_writew(bus, CORBWP, wp);
 144
 145         spin_unlock_irq(&bus->reg_lock);
 146
 147         return 0;
 148 }
 149 EXPORT_SYMBOL_GPL(snd_hdac_bus_send_cmd);
 150
 151 #define AZX_RIRB_EX_UNSOL_EV    (1<<4)
 152
 153 /**
 154  * snd_hdac_bus_update_rirb - retrieve RIRB entries
 155  * @bus: HD-audio core bus
 156  *
 157  * Usually called from interrupt handler.
 158  */
 159 void snd_hdac_bus_update_rirb(struct hdac_bus *bus)
 160 {
 161         unsigned int rp, wp;
 162         unsigned int addr;
 163         u32 res, res_ex;
 164
 165         wp = snd_hdac_chip_readw(bus, RIRBWP);
 166         if (wp == 0xffff) {
 167                 /* something wrong, controller likely turned to D3 */
 168                 return;
 169         }
 170
 171         if (wp == bus->rirb.wp)
 172                 return;
 173         bus->rirb.wp = wp;
 174
 175         while (bus->rirb.rp != wp) {
 176                 bus->rirb.rp++;
 177                 bus->rirb.rp %= AZX_MAX_RIRB_ENTRIES;
 178
 179                 rp = bus->rirb.rp << 1; /* an RIRB entry is 8-bytes */
 180                 res_ex = le32_to_cpu(bus->rirb.buf[rp + 1]);
 181                 res = le32_to_cpu(bus->rirb.buf[rp]);
 182                 addr = res_ex & 0xf;
 183                 if (addr >= HDA_MAX_CODECS) {
 184                         dev_err(bus->dev,
 185                                 "spurious response %#x:%#x, rp = %d, wp = %d",
 186                                 res, res_ex, bus->rirb.rp, wp);
 187                         snd_BUG();
 188                 } else if (res_ex & AZX_RIRB_EX_UNSOL_EV)
 189                         snd_hdac_bus_queue_event(bus, res, res_ex);
 190                 else if (bus->rirb.cmds[addr]) {
 191                         bus->rirb.res[addr] = res;
 192                         bus->rirb.cmds[addr]--;
 193                 } else {
 194                         dev_err_ratelimited(bus->dev,
 195                                 "spurious response %#x:%#x, last cmd=%#08x\n",
 196                                 res, res_ex, bus->last_cmd[addr]);
 197                 }
 198         }
 199 }
 200 EXPORT_SYMBOL_GPL(snd_hdac_bus_update_rirb);
 201
 202 /**
 203  * snd_hdac_bus_get_response - receive a response via RIRB
 204  * @bus: HD-audio core bus
 205  * @addr: codec address
 206  * @res: pointer to store the value, NULL when not needed
 207  *
 208  * Returns zero if a value is read, or a negative error code.
 209  */
 210 int snd_hdac_bus_get_response(struct hdac_bus *bus, unsigned int addr,
 211                               unsigned int *res)
 212 {
 213         unsigned long timeout;
 214         unsigned long loopcounter;
 215
 216         timeout = jiffies + msecs_to_jiffies(1000);
 217
 218         for (loopcounter = 0;; loopcounter++) {
 219                 spin_lock_irq(&bus->reg_lock);
 220                 if (!bus->rirb.cmds[addr]) {
 221                         if (res)
 222                                 *res = bus->rirb.res[addr]; /* the last value */
 223                         spin_unlock_irq(&bus->reg_lock);
 224                         return 0;
 225                 }
 226                 spin_unlock_irq(&bus->reg_lock);
 227                 if (time_after(jiffies, timeout))
 228                         break;
 229                 if (loopcounter > 3000)
 230                         msleep(2); /* temporary workaround */
 231                 else {
 232                         udelay(10);
 233                         cond_resched();
 234                 }
 235         }
 236
 237         return -EIO;
 238 }
 239 EXPORT_SYMBOL_GPL(snd_hdac_bus_get_response);
 240
 241 /*
 242  * Lowlevel interface
 243  */
 244
 245 /**
 246  * snd_hdac_bus_enter_link_reset - enter link reset
 247  * @bus: HD-audio core bus
 248  *
 249  * Enter to the link reset state.
 250  */
 251 void snd_hdac_bus_enter_link_reset(struct hdac_bus *bus)
 252 {
 253         unsigned long timeout;
 254
 255         /* reset controller */
 256         snd_hdac_chip_updatel(bus, GCTL, AZX_GCTL_RESET, 0);
 257
 258         timeout = jiffies + msecs_to_jiffies(100);
 259         while ((snd_hdac_chip_readb(bus, GCTL) & AZX_GCTL_RESET) &&
 260                time_before(jiffies, timeout))
 261                 usleep_range(500, 1000);
 262 }
 263 EXPORT_SYMBOL_GPL(snd_hdac_bus_enter_link_reset);
 264
 265 /**
 266  * snd_hdac_bus_exit_link_reset - exit link reset
 267  * @bus: HD-audio core bus
 268  *
 269  * Exit from the link reset state.
 270  */
 271 void snd_hdac_bus_exit_link_reset(struct hdac_bus *bus)
 272 {
 273         unsigned long timeout;
 274
 275         snd_hdac_chip_updateb(bus, GCTL, 0, AZX_GCTL_RESET);
 276
 277         timeout = jiffies + msecs_to_jiffies(100);
 278         while (!snd_hdac_chip_readb(bus, GCTL) && time_before(jiffies, timeout))
 279                 usleep_range(500, 1000);
 280 }
 281 EXPORT_SYMBOL_GPL(snd_hdac_bus_exit_link_reset);
 282
 283 /* reset codec link */
 284 static int azx_reset(struct hdac_bus *bus, bool full_reset)
 285 {
 286         if (!full_reset)
 287                 goto skip_reset;
 288
 289         /* clear STATESTS */
 290         snd_hdac_chip_writew(bus, STATESTS, STATESTS_INT_MASK);
 291
 292         /* reset controller */
 293         snd_hdac_bus_enter_link_reset(bus);
 294
 295         /* delay for >= 100us for codec PLL to settle per spec
 296          * Rev 0.9 section 5.5.1
 297          */
 298         usleep_range(500, 1000);
 299
 300         /* Bring controller out of reset */
 301         snd_hdac_bus_exit_link_reset(bus);
 302
 303         /* Brent Chartrand said to wait >= 540us for codecs to initialize */
 304         usleep_range(1000, 1200);
 305
 306  skip_reset:
 307         /* check to see if controller is ready */
 308         if (!snd_hdac_chip_readb(bus, GCTL)) {
 309                 dev_dbg(bus->dev, "azx_reset: controller not ready!\n");
 310                 return -EBUSY;
 311         }
 312
 313         /* Accept unsolicited responses */
 314         snd_hdac_chip_updatel(bus, GCTL, 0, AZX_GCTL_UNSOL);
 315
 316         /* detect codecs */
 317         if (!bus->codec_mask) {
 318                 bus->codec_mask = snd_hdac_chip_readw(bus, STATESTS);
 319                 dev_dbg(bus->dev, "codec_mask = 0x%lx\n", bus->codec_mask);
 320         }
 321
 322         return 0;
 323 }
 324
 325 /* enable interrupts */
 326 static void azx_int_enable(struct hdac_bus *bus)
 327 {
 328         /* enable controller CIE and GIE */
 329         snd_hdac_chip_updatel(bus, INTCTL, 0, AZX_INT_CTRL_EN | AZX_INT_GLOBAL_EN);
 330 }
 331
 332 /* disable interrupts */
 333 static void azx_int_disable(struct hdac_bus *bus)
 334 {
 335         struct hdac_stream *azx_dev;
 336
 337         /* disable interrupts in stream descriptor */
 338         list_for_each_entry(azx_dev, &bus->stream_list, list)
 339                 snd_hdac_stream_updateb(azx_dev, SD_CTL, SD_INT_MASK, 0);
 340
 341         /* disable SIE for all streams */
 342         snd_hdac_chip_writeb(bus, INTCTL, 0);
 343
 344         /* disable controller CIE and GIE */
 345         snd_hdac_chip_updatel(bus, INTCTL, AZX_INT_CTRL_EN | AZX_INT_GLOBAL_EN, 0);
 346 }
 347
 348 /* clear interrupts */
 349 static void azx_int_clear(struct hdac_bus *bus)
 350 {
 351         struct hdac_stream *azx_dev;
 352
 353         /* clear stream status */
 354         list_for_each_entry(azx_dev, &bus->stream_list, list)
 355                 snd_hdac_stream_writeb(azx_dev, SD_STS, SD_INT_MASK);
 356
 357         /* clear STATESTS */
 358         snd_hdac_chip_writew(bus, STATESTS, STATESTS_INT_MASK);
 359
 360         /* clear rirb status */
 361         snd_hdac_chip_writeb(bus, RIRBSTS, RIRB_INT_MASK);
 362
 363         /* clear int status */
 364         snd_hdac_chip_writel(bus, INTSTS, AZX_INT_CTRL_EN | AZX_INT_ALL_STREAM);
 365 }
 366
 367 /**
 368  * snd_hdac_bus_init_chip - reset and start the controller registers
 369  * @bus: HD-audio core bus
 370  * @full_reset: Do full reset
 371  */
 372 bool snd_hdac_bus_init_chip(struct hdac_bus *bus, bool full_reset)
 373 {
 374         if (bus->chip_init)
 375                 return false;
 376
 377         /* reset controller */
 378         azx_reset(bus, full_reset);
 379
 380         /* initialize interrupts */
 381         azx_int_clear(bus);
 382         azx_int_enable(bus);
 383
 384         /* initialize the codec command I/O */
 385         snd_hdac_bus_init_cmd_io(bus);
 386
 387         /* program the position buffer */
 388         if (bus->use_posbuf && bus->posbuf.addr) {
 389                 snd_hdac_chip_writel(bus, DPLBASE, (u32)bus->posbuf.addr);
 390                 snd_hdac_chip_writel(bus, DPUBASE, upper_32_bits(bus->posbuf.addr));
 391         }
 392
 393         bus->chip_init = true;
 394         return true;
 395 }
 396 EXPORT_SYMBOL_GPL(snd_hdac_bus_init_chip);
 397
 398 /**
 399  * snd_hdac_bus_stop_chip - disable the whole IRQ and I/Os
 400  * @bus: HD-audio core bus
 401  */
 402 void snd_hdac_bus_stop_chip(struct hdac_bus *bus)
 403 {
 404         if (!bus->chip_init)
 405                 return;
 406
 407         /* disable interrupts */
 408         azx_int_disable(bus);
 409         azx_int_clear(bus);
 410
 411         /* disable CORB/RIRB */
 412         snd_hdac_bus_stop_cmd_io(bus);
 413
 414         /* disable position buffer */
 415         if (bus->posbuf.addr) {
 416                 snd_hdac_chip_writel(bus, DPLBASE, 0);
 417                 snd_hdac_chip_writel(bus, DPUBASE, 0);
 418         }
 419
 420         bus->chip_init = false;
 421 }
 422 EXPORT_SYMBOL_GPL(snd_hdac_bus_stop_chip);
 423
 424 /**
 425  * snd_hdac_bus_handle_stream_irq - interrupt handler for streams
 426  * @bus: HD-audio core bus
 427  * @status: INTSTS register value
 428  * @ask: callback to be called for woken streams
 429  */
 430 void snd_hdac_bus_handle_stream_irq(struct hdac_bus *bus, unsigned int status,
 431                                     void (*ack)(struct hdac_bus *,
 432                                                 struct hdac_stream *))
 433 {
 434         struct hdac_stream *azx_dev;
 435         u8 sd_status;
 436
 437         list_for_each_entry(azx_dev, &bus->stream_list, list) {
 438                 if (status & azx_dev->sd_int_sta_mask) {
 439                         sd_status = snd_hdac_stream_readb(azx_dev, SD_STS);
 440                         snd_hdac_stream_writeb(azx_dev, SD_STS, SD_INT_MASK);
 441                         if (!azx_dev->substream || !azx_dev->running ||
 442                             !(sd_status & SD_INT_COMPLETE))
 443                                 continue;
 444                         if (ack)
 445                                 ack(bus, azx_dev);
 446                 }
 447         }
 448 }
 449 EXPORT_SYMBOL_GPL(snd_hdac_bus_handle_stream_irq);
 450
 451 /**
 452  * snd_hdac_bus_alloc_stream_pages - allocate BDL and other buffers
 453  * @bus: HD-audio core bus
 454  *
 455  * Call this after assigning the all streams.
 456  * Returns zero for success, or a negative error code.
 457  */
 458 int snd_hdac_bus_alloc_stream_pages(struct hdac_bus *bus)
 459 {
 460         struct hdac_stream *s;
 461         int num_streams = 0;
 462         int err;
 463
 464         list_for_each_entry(s, &bus->stream_list, list) {
 465                 /* allocate memory for the BDL for each stream */
 466                 err = bus->io_ops->dma_alloc_pages(bus, SNDRV_DMA_TYPE_DEV,
 467                                                    BDL_SIZE, &s->bdl);
 468                 num_streams++;
 469                 if (err < 0)
 470                         return -ENOMEM;
 471         }
 472
 473         if (WARN_ON(!num_streams))
 474                 return -EINVAL;
 475         /* allocate memory for the position buffer */
 476         err = bus->io_ops->dma_alloc_pages(bus, SNDRV_DMA_TYPE_DEV,
 477                                            num_streams * 8, &bus->posbuf);
 478         if (err < 0)
 479                 return -ENOMEM;
 480         list_for_each_entry(s, &bus->stream_list, list)
 481                 s->posbuf = (__le32 *)(bus->posbuf.area + s->index * 8);
 482
 483         /* single page (at least 4096 bytes) must suffice for both ringbuffes */
 484         return bus->io_ops->dma_alloc_pages(bus, SNDRV_DMA_TYPE_DEV,
 485                                             PAGE_SIZE, &bus->rb);
 486 }
 487 EXPORT_SYMBOL_GPL(snd_hdac_bus_alloc_stream_pages);
 488
 489 /**
 490  * snd_hdac_bus_free_stream_pages - release BDL and other buffers
 491  * @bus: HD-audio core bus
 492  */
 493 void snd_hdac_bus_free_stream_pages(struct hdac_bus *bus)
 494 {
 495         struct hdac_stream *s;
 496
 497         list_for_each_entry(s, &bus->stream_list, list) {
 498                 if (s->bdl.area)
 499                         bus->io_ops->dma_free_pages(bus, &s->bdl);
 500         }
 501
 502         if (bus->rb.area)
 503                 bus->io_ops->dma_free_pages(bus, &bus->rb);
 504         if (bus->posbuf.area)
 505                 bus->io_ops->dma_free_pages(bus, &bus->posbuf);
 506 }
 507 EXPORT_SYMBOL_GPL(snd_hdac_bus_free_stream_pages);