sound/arm/aaci.c

   1 /*
   2  *  linux/sound/arm/aaci.c - ARM PrimeCell AACI PL041 driver
   3  *
   4  *  Copyright (C) 2003 Deep Blue Solutions Ltd, All Rights Reserved.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  *
  10  *  Documentation: ARM DDI 0173B
  11  */
  12 #include <linux/module.h>
  13 #include <linux/delay.h>
  14 #include <linux/init.h>
  15 #include <linux/ioport.h>
  16 #include <linux/device.h>
  17 #include <linux/spinlock.h>
  18 #include <linux/interrupt.h>
  19 #include <linux/err.h>
  20
  21 #include <asm/io.h>
  22 #include <asm/irq.h>
  23 #include <asm/hardware/amba.h>
  24
  25 #include <sound/driver.h>
  26 #include <sound/core.h>
  27 #include <sound/initval.h>
  28 #include <sound/ac97_codec.h>
  29 #include <sound/pcm.h>
  30 #include <sound/pcm_params.h>
  31
  32 #include "aaci.h"
  33 #include "devdma.h"
  34
  35 #define DRIVER_NAME     "aaci-pl041"
  36
  37 /*
  38  * PM support is not complete.  Turn it off.
  39  */
  40 #undef CONFIG_PM
  41
  42 static void aaci_ac97_select_codec(struct aaci *aaci, ac97_t *ac97)
  43 {
  44         u32 v, maincr = aaci->maincr | MAINCR_SCRA(ac97->num);
  45
  46         /*
  47          * Ensure that the slot 1/2 RX registers are empty.
  48          */
  49         v = readl(aaci->base + AACI_SLFR);
  50         if (v & SLFR_2RXV)
  51                 readl(aaci->base + AACI_SL2RX);
  52         if (v & SLFR_1RXV)
  53                 readl(aaci->base + AACI_SL1RX);
  54
  55         writel(maincr, aaci->base + AACI_MAINCR);
  56 }
  57
  58 /*
  59  * P29:
  60  *  The recommended use of programming the external codec through slot 1
  61  *  and slot 2 data is to use the channels during setup routines and the
  62  *  slot register at any other time.  The data written into slot 1, slot 2
  63  *  and slot 12 registers is transmitted only when their corresponding
  64  *  SI1TxEn, SI2TxEn and SI12TxEn bits are set in the AACI_MAINCR
  65  *  register.
  66  */
  67 static void aaci_ac97_write(ac97_t *ac97, unsigned short reg, unsigned short val)
  68 {
  69         struct aaci *aaci = ac97->private_data;
  70         u32 v;
  71
  72         if (ac97->num >= 4)
  73                 return;
  74
  75         down(&aaci->ac97_sem);
  76
  77         aaci_ac97_select_codec(aaci, ac97);
  78
  79         /*
  80          * P54: You must ensure that AACI_SL2TX is always written
  81          * to, if required, before data is written to AACI_SL1TX.
  82          */
  83         writel(val << 4, aaci->base + AACI_SL2TX);
  84         writel(reg << 12, aaci->base + AACI_SL1TX);
  85
  86         /*
  87          * Wait for the transmission of both slots to complete.
  88          */
  89         do {
  90                 v = readl(aaci->base + AACI_SLFR);
  91         } while (v & (SLFR_1TXB|SLFR_2TXB));
  92
  93         up(&aaci->ac97_sem);
  94 }
  95
  96 /*
  97  * Read an AC'97 register.
  98  */
  99 static unsigned short aaci_ac97_read(ac97_t *ac97, unsigned short reg)
 100 {
 101         struct aaci *aaci = ac97->private_data;
 102         u32 v;
 103
 104         if (ac97->num >= 4)
 105                 return ~0;
 106
 107         down(&aaci->ac97_sem);
 108
 109         aaci_ac97_select_codec(aaci, ac97);
 110
 111         /*
 112          * Write the register address to slot 1.
 113          */
 114         writel((reg << 12) | (1 << 19), aaci->base + AACI_SL1TX);
 115
 116         /*
 117          * Wait for the transmission to complete.
 118          */
 119         do {
 120                 v = readl(aaci->base + AACI_SLFR);
 121         } while (v & SLFR_1TXB);
 122
 123         /*
 124          * Give the AC'97 codec more than enough time
 125          * to respond. (42us = ~2 frames at 48kHz.)
 126          */
 127         udelay(42);
 128
 129         /*
 130          * Wait for slot 2 to indicate data.
 131          */
 132         do {
 133                 cond_resched();
 134                 v = readl(aaci->base + AACI_SLFR) & (SLFR_1RXV|SLFR_2RXV);
 135         } while (v != (SLFR_1RXV|SLFR_2RXV));
 136
 137         v = readl(aaci->base + AACI_SL1RX) >> 12;
 138         if (v == reg) {
 139                 v = readl(aaci->base + AACI_SL2RX) >> 4;
 140         } else {
 141                 dev_err(&aaci->dev->dev,
 142                         "wrong ac97 register read back (%x != %x)\n",
 143                         v, reg);
 144                 v = ~0;
 145         }
 146
 147         up(&aaci->ac97_sem);
 148         return v;
 149 }
 150
 151 static inline void aaci_chan_wait_ready(struct aaci_runtime *aacirun)
 152 {
 153         u32 val;
 154         int timeout = 5000;
 155
 156         do {
 157                 val = readl(aacirun->base + AACI_SR);
 158         } while (val & (SR_TXB|SR_RXB) && timeout--);
 159 }
 160
 161
 162
 163 /*
 164  * Interrupt support.
 165  */
 166 static void aaci_fifo_irq(struct aaci *aaci, u32 mask)
 167 {
 168         if (mask & ISR_URINTR) {
 169                 writel(ICLR_TXUEC1, aaci->base + AACI_INTCLR);
 170         }
 171
 172         if (mask & ISR_TXINTR) {
 173                 struct aaci_runtime *aacirun = &aaci->playback;
 174                 void *ptr;
 175
 176                 if (!aacirun->substream || !aacirun->start) {
 177                         dev_warn(&aaci->dev->dev, "TX interrupt???");
 178                         writel(0, aacirun->base + AACI_IE);
 179                         return;
 180                 }
 181
 182                 ptr = aacirun->ptr;
 183                 do {
 184                         unsigned int len = aacirun->fifosz;
 185                         u32 val;
 186
 187                         if (aacirun->bytes <= 0) {
 188                                 aacirun->bytes += aacirun->period;
 189                                 aacirun->ptr = ptr;
 190                                 spin_unlock(&aaci->lock);
 191                                 snd_pcm_period_elapsed(aacirun->substream);
 192                                 spin_lock(&aaci->lock);
 193                         }
 194                         if (!(aacirun->cr & TXCR_TXEN))
 195                                 break;
 196
 197                         val = readl(aacirun->base + AACI_SR);
 198                         if (!(val & SR_TXHE))
 199                                 break;
 200                         if (!(val & SR_TXFE))
 201                                 len >>= 1;
 202
 203                         aacirun->bytes -= len;
 204
 205                         /* writing 16 bytes at a time */
 206                         for ( ; len > 0; len -= 16) {
 207                                 asm(
 208                                         "ldmia  %0!, {r0, r1, r2, r3}\n\t"
 209                                         "stmia  %1, {r0, r1, r2, r3}"
 210                                         : "+r" (ptr)
 211                                         : "r" (aacirun->fifo)
 212                                         : "r0", "r1", "r2", "r3", "cc");
 213
 214                                 if (ptr >= aacirun->end)
 215                                         ptr = aacirun->start;
 216                         }
 217                 } while (1);
 218
 219                 aacirun->ptr = ptr;
 220         }
 221 }
 222
 223 static irqreturn_t aaci_irq(int irq, void *devid, struct pt_regs *regs)
 224 {
 225         struct aaci *aaci = devid;
 226         u32 mask;
 227         int i;
 228
 229         spin_lock(&aaci->lock);
 230         mask = readl(aaci->base + AACI_ALLINTS);
 231         if (mask) {
 232                 u32 m = mask;
 233                 for (i = 0; i < 4; i++, m >>= 7) {
 234                         if (m & 0x7f) {
 235                                 aaci_fifo_irq(aaci, m);
 236                         }
 237                 }
 238         }
 239         spin_unlock(&aaci->lock);
 240
 241         return mask ? IRQ_HANDLED : IRQ_NONE;
 242 }
 243
 244
 245
 246 /*
 247  * ALSA support.
 248  */
 249
 250 struct aaci_stream {
 251         unsigned char codec_idx;
 252         unsigned char rate_idx;
 253 };
 254
 255 static struct aaci_stream aaci_streams[] = {
 256         [ACSTREAM_FRONT] = {
 257                 .codec_idx      = 0,
 258                 .rate_idx       = AC97_RATES_FRONT_DAC,
 259         },
 260         [ACSTREAM_SURROUND] = {
 261                 .codec_idx      = 0,
 262                 .rate_idx       = AC97_RATES_SURR_DAC,
 263         },
 264         [ACSTREAM_LFE] = {
 265                 .codec_idx      = 0,
 266                 .rate_idx       = AC97_RATES_LFE_DAC,
 267         },
 268 };
 269
 270 static inline unsigned int aaci_rate_mask(struct aaci *aaci, int streamid)
 271 {
 272         struct aaci_stream *s = aaci_streams + streamid;
 273         return aaci->ac97_bus->codec[s->codec_idx]->rates[s->rate_idx];
 274 }
 275
 276 static unsigned int rate_list[] = {
 277         5512, 8000, 11025, 16000, 22050, 32000, 44100,
 278         48000, 64000, 88200, 96000, 176400, 192000
 279 };
 280
 281 /*
 282  * Double-rate rule: we can support double rate iff channels == 2
 283  *  (unimplemented)
 284  */
 285 static int
 286 aaci_rule_rate_by_channels(snd_pcm_hw_params_t *p, snd_pcm_hw_rule_t *rule)
 287 {
 288         struct aaci *aaci = rule->private;
 289         unsigned int rate_mask = SNDRV_PCM_RATE_8000_48000|SNDRV_PCM_RATE_5512;
 290         snd_interval_t *c = hw_param_interval(p, SNDRV_PCM_HW_PARAM_CHANNELS);
 291
 292         switch (c->max) {
 293         case 6:
 294                 rate_mask &= aaci_rate_mask(aaci, ACSTREAM_LFE);
 295         case 4:
 296                 rate_mask &= aaci_rate_mask(aaci, ACSTREAM_SURROUND);
 297         case 2:
 298                 rate_mask &= aaci_rate_mask(aaci, ACSTREAM_FRONT);
 299         }
 300
 301         return snd_interval_list(hw_param_interval(p, rule->var),
 302                                  ARRAY_SIZE(rate_list), rate_list,
 303                                  rate_mask);
 304 }
 305
 306 static snd_pcm_hardware_t aaci_hw_info = {
 307         .info                   = SNDRV_PCM_INFO_MMAP |
 308                                   SNDRV_PCM_INFO_MMAP_VALID |
 309                                   SNDRV_PCM_INFO_INTERLEAVED |
 310                                   SNDRV_PCM_INFO_BLOCK_TRANSFER |
 311                                   SNDRV_PCM_INFO_RESUME,
 312
 313         /*
 314          * ALSA doesn't support 18-bit or 20-bit packed into 32-bit
 315          * words.  It also doesn't support 12-bit at all.
 316          */
 317         .formats                = SNDRV_PCM_FMTBIT_S16_LE,
 318
 319         /* should this be continuous or knot? */
 320         .rates                  = SNDRV_PCM_RATE_CONTINUOUS,
 321         .rate_max               = 48000,
 322         .rate_min               = 4000,
 323         .channels_min           = 2,
 324         .channels_max           = 6,
 325         .buffer_bytes_max       = 64 * 1024,
 326         .period_bytes_min       = 256,
 327         .period_bytes_max       = PAGE_SIZE,
 328         .periods_min            = 4,
 329         .periods_max            = PAGE_SIZE / 16,
 330 };
 331
 332 static int aaci_pcm_open(struct aaci *aaci, snd_pcm_substream_t *substream,
 333                          struct aaci_runtime *aacirun)
 334 {
 335         snd_pcm_runtime_t *runtime = substream->runtime;
 336         int ret;
 337
 338         aacirun->substream = substream;
 339         runtime->private_data = aacirun;
 340         runtime->hw = aaci_hw_info;
 341
 342         /*
 343          * FIXME: ALSA specifies fifo_size in bytes.  If we're in normal
 344          * mode, each 32-bit word contains one sample.  If we're in
 345          * compact mode, each 32-bit word contains two samples, effectively
 346          * halving the FIFO size.  However, we don't know for sure which
 347          * we'll be using at this point.  We set this to the lower limit.
 348          */
 349         runtime->hw.fifo_size = aaci->fifosize * 2;
 350
 351         /*
 352          * Add rule describing hardware rate dependency
 353          * on the number of channels.
 354          */
 355         ret = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
 356                                   aaci_rule_rate_by_channels, aaci,
 357                                   SNDRV_PCM_HW_PARAM_CHANNELS,
 358                                   SNDRV_PCM_HW_PARAM_RATE, -1);
 359         if (ret)
 360                 goto out;
 361
 362         ret = request_irq(aaci->dev->irq[0], aaci_irq, SA_SHIRQ|SA_INTERRUPT,
 363                           DRIVER_NAME, aaci);
 364         if (ret)
 365                 goto out;
 366
 367         return 0;
 368
 369  out:
 370         return ret;
 371 }
 372
 373
 374 /*
 375  * Common ALSA stuff
 376  */
 377 static int aaci_pcm_close(snd_pcm_substream_t *substream)
 378 {
 379         struct aaci *aaci = substream->private_data;
 380         struct aaci_runtime *aacirun = substream->runtime->private_data;
 381
 382         WARN_ON(aacirun->cr & TXCR_TXEN);
 383
 384         aacirun->substream = NULL;
 385         free_irq(aaci->dev->irq[0], aaci);
 386
 387         return 0;
 388 }
 389
 390 static int aaci_pcm_hw_free(snd_pcm_substream_t *substream)
 391 {
 392         struct aaci_runtime *aacirun = substream->runtime->private_data;
 393
 394         /*
 395          * This must not be called with the device enabled.
 396          */
 397         WARN_ON(aacirun->cr & TXCR_TXEN);
 398
 399         if (aacirun->pcm_open)
 400                 snd_ac97_pcm_close(aacirun->pcm);
 401         aacirun->pcm_open = 0;
 402
 403         /*
 404          * Clear out the DMA and any allocated buffers.
 405          */
 406         devdma_hw_free(NULL, substream);
 407
 408         return 0;
 409 }
 410
 411 static int aaci_pcm_hw_params(snd_pcm_substream_t *substream,
 412                               struct aaci_runtime *aacirun,
 413                               snd_pcm_hw_params_t *params)
 414 {
 415         int err;
 416
 417         aaci_pcm_hw_free(substream);
 418
 419         err = devdma_hw_alloc(NULL, substream,
 420                               params_buffer_bytes(params));
 421         if (err < 0)
 422                 goto out;
 423
 424         err = snd_ac97_pcm_open(aacirun->pcm, params_rate(params),
 425                                 params_channels(params),
 426                                 aacirun->pcm->r[0].slots);
 427         if (err)
 428                 goto out;
 429
 430         aacirun->pcm_open = 1;
 431
 432  out:
 433         return err;
 434 }
 435
 436 static int aaci_pcm_prepare(snd_pcm_substream_t *substream)
 437 {
 438         snd_pcm_runtime_t *runtime = substream->runtime;
 439         struct aaci_runtime *aacirun = runtime->private_data;
 440
 441         aacirun->start  = (void *)runtime->dma_area;
 442         aacirun->end    = aacirun->start + runtime->dma_bytes;
 443         aacirun->ptr    = aacirun->start;
 444         aacirun->period =
 445         aacirun->bytes  = frames_to_bytes(runtime, runtime->period_size);
 446
 447         return 0;
 448 }
 449
 450 static snd_pcm_uframes_t aaci_pcm_pointer(snd_pcm_substream_t *substream)
 451 {
 452         snd_pcm_runtime_t *runtime = substream->runtime;
 453         struct aaci_runtime *aacirun = runtime->private_data;
 454         ssize_t bytes = aacirun->ptr - aacirun->start;
 455
 456         return bytes_to_frames(runtime, bytes);
 457 }
 458
 459 static int aaci_pcm_mmap(snd_pcm_substream_t *substream, struct vm_area_struct *vma)
 460 {
 461         return devdma_mmap(NULL, substream, vma);
 462 }
 463
 464
 465 /*
 466  * Playback specific ALSA stuff
 467  */
 468 static const u32 channels_to_txmask[] = {
 469         [2] = TXCR_TX3 | TXCR_TX4,
 470         [4] = TXCR_TX3 | TXCR_TX4 | TXCR_TX7 | TXCR_TX8,
 471         [6] = TXCR_TX3 | TXCR_TX4 | TXCR_TX7 | TXCR_TX8 | TXCR_TX6 | TXCR_TX9,
 472 };
 473
 474 /*
 475  * We can support two and four channel audio.  Unfortunately
 476  * six channel audio requires a non-standard channel ordering:
 477  *   2 -> FL(3), FR(4)
 478  *   4 -> FL(3), FR(4), SL(7), SR(8)
 479  *   6 -> FL(3), FR(4), SL(7), SR(8), C(6), LFE(9) (required)
 480  *        FL(3), FR(4), C(6), SL(7), SR(8), LFE(9) (actual)
 481  * This requires an ALSA configuration file to correct.
 482  */
 483 static unsigned int channel_list[] = { 2, 4, 6 };
 484
 485 static int
 486 aaci_rule_channels(snd_pcm_hw_params_t *p, snd_pcm_hw_rule_t *rule)
 487 {
 488         struct aaci *aaci = rule->private;
 489         unsigned int chan_mask = 1 << 0, slots;
 490
 491         /*
 492          * pcms[0] is the our 5.1 PCM instance.
 493          */
 494         slots = aaci->ac97_bus->pcms[0].r[0].slots;
 495         if (slots & (1 << AC97_SLOT_PCM_SLEFT)) {
 496                 chan_mask |= 1 << 1;
 497                 if (slots & (1 << AC97_SLOT_LFE))
 498                         chan_mask |= 1 << 2;
 499         }
 500
 501         return snd_interval_list(hw_param_interval(p, rule->var),
 502                                  ARRAY_SIZE(channel_list), channel_list,
 503                                  chan_mask);
 504 }
 505
 506 static int aaci_pcm_playback_open(snd_pcm_substream_t *substream)
 507 {
 508         struct aaci *aaci = substream->private_data;
 509         int ret;
 510
 511         /*
 512          * Add rule describing channel dependency.
 513          */
 514         ret = snd_pcm_hw_rule_add(substream->runtime, 0,
 515                                   SNDRV_PCM_HW_PARAM_CHANNELS,
 516                                   aaci_rule_channels, aaci,
 517                                   SNDRV_PCM_HW_PARAM_CHANNELS, -1);
 518         if (ret)
 519                 return ret;
 520
 521         return aaci_pcm_open(aaci, substream, &aaci->playback);
 522 }
 523
 524 static int aaci_pcm_playback_hw_params(snd_pcm_substream_t *substream,
 525                                        snd_pcm_hw_params_t *params)
 526 {
 527         struct aaci *aaci = substream->private_data;
 528         struct aaci_runtime *aacirun = substream->runtime->private_data;
 529         unsigned int channels = params_channels(params);
 530         int ret;
 531
 532         WARN_ON(channels >= ARRAY_SIZE(channels_to_txmask) ||
 533                 !channels_to_txmask[channels]);
 534
 535         ret = aaci_pcm_hw_params(substream, aacirun, params);
 536
 537         /*
 538          * Enable FIFO, compact mode, 16 bits per sample.
 539          * FIXME: double rate slots?
 540          */
 541         if (ret >= 0) {
 542                 aacirun->cr = TXCR_FEN | TXCR_COMPACT | TXCR_TSZ16;
 543                 aacirun->cr |= channels_to_txmask[channels];
 544
 545                 aacirun->fifosz = aaci->fifosize * 4;
 546                 if (aacirun->cr & TXCR_COMPACT)
 547                         aacirun->fifosz >>= 1;
 548         }
 549         return ret;
 550 }
 551
 552 static void aaci_pcm_playback_stop(struct aaci_runtime *aacirun)
 553 {
 554         u32 ie;
 555
 556         ie = readl(aacirun->base + AACI_IE);
 557         ie &= ~(IE_URIE|IE_TXIE);
 558         writel(ie, aacirun->base + AACI_IE);
 559         aacirun->cr &= ~TXCR_TXEN;
 560         aaci_chan_wait_ready(aacirun);
 561         writel(aacirun->cr, aacirun->base + AACI_TXCR);
 562 }
 563
 564 static void aaci_pcm_playback_start(struct aaci_runtime *aacirun)
 565 {
 566         u32 ie;
 567
 568         aaci_chan_wait_ready(aacirun);
 569         aacirun->cr |= TXCR_TXEN;
 570
 571         ie = readl(aacirun->base + AACI_IE);
 572         ie |= IE_URIE | IE_TXIE;
 573         writel(ie, aacirun->base + AACI_IE);
 574         writel(aacirun->cr, aacirun->base + AACI_TXCR);
 575 }
 576
 577 static int aaci_pcm_playback_trigger(snd_pcm_substream_t *substream, int cmd)
 578 {
 579         struct aaci *aaci = substream->private_data;
 580         struct aaci_runtime *aacirun = substream->runtime->private_data;
 581         unsigned long flags;
 582         int ret = 0;
 583
 584         spin_lock_irqsave(&aaci->lock, flags);
 585         switch (cmd) {
 586         case SNDRV_PCM_TRIGGER_START:
 587                 aaci_pcm_playback_start(aacirun);
 588                 break;
 589
 590         case SNDRV_PCM_TRIGGER_RESUME:
 591                 aaci_pcm_playback_start(aacirun);
 592                 break;
 593
 594         case SNDRV_PCM_TRIGGER_STOP:
 595                 aaci_pcm_playback_stop(aacirun);
 596                 break;
 597
 598         case SNDRV_PCM_TRIGGER_SUSPEND:
 599                 aaci_pcm_playback_stop(aacirun);
 600                 break;
 601
 602         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 603                 break;
 604
 605         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 606                 break;
 607
 608         default:
 609                 ret = -EINVAL;
 610         }
 611         spin_unlock_irqrestore(&aaci->lock, flags);
 612
 613         return ret;
 614 }
 615
 616 static snd_pcm_ops_t aaci_playback_ops = {
 617         .open           = aaci_pcm_playback_open,
 618         .close          = aaci_pcm_close,
 619         .ioctl          = snd_pcm_lib_ioctl,
 620         .hw_params      = aaci_pcm_playback_hw_params,
 621         .hw_free        = aaci_pcm_hw_free,
 622         .prepare        = aaci_pcm_prepare,
 623         .trigger        = aaci_pcm_playback_trigger,
 624         .pointer        = aaci_pcm_pointer,
 625         .mmap           = aaci_pcm_mmap,
 626 };
 627
 628
 629
 630 /*
 631  * Power Management.
 632  */
 633 #ifdef CONFIG_PM
 634 static int aaci_do_suspend(snd_card_t *card, unsigned int state)
 635 {
 636         struct aaci *aaci = card->private_data;
 637         if (aaci->card->power_state != SNDRV_CTL_POWER_D3cold) {
 638                 snd_pcm_suspend_all(aaci->pcm);
 639                 snd_power_change_state(aaci->card, SNDRV_CTL_POWER_D3cold);
 640         }
 641         return 0;
 642 }
 643
 644 static int aaci_do_resume(snd_card_t *card, unsigned int state)
 645 {
 646         struct aaci *aaci = card->private_data;
 647         if (aaci->card->power_state != SNDRV_CTL_POWER_D0) {
 648                 snd_power_change_state(aaci->card, SNDRV_CTL_POWER_D0);
 649         }
 650         return 0;
 651 }
 652
 653 static int aaci_suspend(struct amba_device *dev, u32 state)
 654 {
 655         snd_card_t *card = amba_get_drvdata(dev);
 656         return card ? aaci_do_suspend(card) : 0;
 657 }
 658
 659 static int aaci_resume(struct amba_device *dev)
 660 {
 661         snd_card_t *card = amba_get_drvdata(dev);
 662         return card ? aaci_do_resume(card) : 0;
 663 }
 664 #else
 665 #define aaci_do_suspend         NULL
 666 #define aaci_do_resume          NULL
 667 #define aaci_suspend            NULL
 668 #define aaci_resume             NULL
 669 #endif
 670
 671
 672 static struct ac97_pcm ac97_defs[] __devinitdata = {
 673         [0] = {         /* Front PCM */
 674                 .exclusive = 1,
 675                 .r = {
 676                         [0] = {
 677                                 .slots  = (1 << AC97_SLOT_PCM_LEFT) |
 678                                           (1 << AC97_SLOT_PCM_RIGHT) |
 679                                           (1 << AC97_SLOT_PCM_CENTER) |
 680                                           (1 << AC97_SLOT_PCM_SLEFT) |
 681                                           (1 << AC97_SLOT_PCM_SRIGHT) |
 682                                           (1 << AC97_SLOT_LFE),
 683                         },
 684                 },
 685         },
 686         [1] = { /* PCM in */
 687                 .stream = 1,
 688                 .exclusive = 1,
 689                 .r = {
 690                         [0] = {
 691                                 .slots  = (1 << AC97_SLOT_PCM_LEFT) |
 692                                           (1 << AC97_SLOT_PCM_RIGHT),
 693                         },
 694                 },
 695         },
 696         [2] = { /* Mic in */
 697                 .stream = 1,
 698                 .exclusive = 1,
 699                 .r = {
 700                         [0] = {
 701                                 .slots  = (1 << AC97_SLOT_MIC),
 702                         },
 703                 },
 704         }
 705 };
 706
 707 static ac97_bus_ops_t aaci_bus_ops = {
 708         .write  = aaci_ac97_write,
 709         .read   = aaci_ac97_read,
 710 };
 711
 712 static int __devinit aaci_probe_ac97(struct aaci *aaci)
 713 {
 714         ac97_template_t ac97_template;
 715         ac97_bus_t *ac97_bus;
 716         ac97_t *ac97;
 717         int ret;
 718
 719         /*
 720          * Assert AACIRESET for 2us
 721          */
 722         writel(0, aaci->base + AACI_RESET);
 723         udelay(2);
 724         writel(RESET_NRST, aaci->base + AACI_RESET);
 725
 726         /*
 727          * Give the AC'97 codec more than enough time
 728          * to wake up. (42us = ~2 frames at 48kHz.)
 729          */
 730         udelay(42);
 731
 732         ret = snd_ac97_bus(aaci->card, 0, &aaci_bus_ops, aaci, &ac97_bus);
 733         if (ret)
 734                 goto out;
 735
 736         ac97_bus->clock = 48000;
 737         aaci->ac97_bus = ac97_bus;
 738
 739         memset(&ac97_template, 0, sizeof(ac97_template_t));
 740         ac97_template.private_data = aaci;
 741         ac97_template.num = 0;
 742         ac97_template.scaps = AC97_SCAP_SKIP_MODEM;
 743
 744         ret = snd_ac97_mixer(ac97_bus, &ac97_template, &ac97);
 745         if (ret)
 746                 goto out;
 747
 748         /*
 749          * Disable AC97 PC Beep input on audio codecs.
 750          */
 751         if (ac97_is_audio(ac97))
 752                 snd_ac97_write_cache(ac97, AC97_PC_BEEP, 0x801e);
 753
 754         ret = snd_ac97_pcm_assign(ac97_bus, ARRAY_SIZE(ac97_defs), ac97_defs);
 755         if (ret)
 756                 goto out;
 757
 758         aaci->playback.pcm = &ac97_bus->pcms[0];
 759
 760  out:
 761         return ret;
 762 }
 763
 764 static void aaci_free_card(snd_card_t *card)
 765 {
 766         struct aaci *aaci = card->private_data;
 767         if (aaci->base)
 768                 iounmap(aaci->base);
 769 }
 770
 771 static struct aaci * __devinit aaci_init_card(struct amba_device *dev)
 772 {
 773         struct aaci *aaci;
 774         snd_card_t *card;
 775
 776         card = snd_card_new(SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1,
 777                             THIS_MODULE, sizeof(struct aaci));
 778         if (card == NULL)
 779                 return ERR_PTR(-ENOMEM);
 780
 781         card->private_free = aaci_free_card;
 782         snd_card_set_pm_callback(card, aaci_do_suspend, aaci_do_resume, NULL);
 783
 784         strlcpy(card->driver, DRIVER_NAME, sizeof(card->driver));
 785         strlcpy(card->shortname, "ARM AC'97 Interface", sizeof(card->shortname));
 786         snprintf(card->longname, sizeof(card->longname),
 787                  "%s at 0x%08lx, irq %d",
 788                  card->shortname, dev->res.start, dev->irq[0]);
 789
 790         aaci = card->private_data;
 791         init_MUTEX(&aaci->ac97_sem);
 792         spin_lock_init(&aaci->lock);
 793         aaci->card = card;
 794         aaci->dev = dev;
 795
 796         /* Set MAINCR to allow slot 1 and 2 data IO */
 797         aaci->maincr = MAINCR_IE | MAINCR_SL1RXEN | MAINCR_SL1TXEN |
 798                        MAINCR_SL2RXEN | MAINCR_SL2TXEN;
 799
 800         return aaci;
 801 }
 802
 803 static int __devinit aaci_init_pcm(struct aaci *aaci)
 804 {
 805         snd_pcm_t *pcm;
 806         int ret;
 807
 808         ret = snd_pcm_new(aaci->card, "AACI AC'97", 0, 1, 0, &pcm);
 809         if (ret == 0) {
 810                 aaci->pcm = pcm;
 811                 pcm->private_data = aaci;
 812                 pcm->info_flags = 0;
 813
 814                 strlcpy(pcm->name, DRIVER_NAME, sizeof(pcm->name));
 815
 816                 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &aaci_playback_ops);
 817         }
 818
 819         return ret;
 820 }
 821
 822 static unsigned int __devinit aaci_size_fifo(struct aaci *aaci)
 823 {
 824         void *base = aaci->base + AACI_CSCH1;
 825         int i;
 826
 827         writel(TXCR_FEN | TXCR_TSZ16 | TXCR_TXEN, base + AACI_TXCR);
 828
 829         for (i = 0; !(readl(base + AACI_SR) & SR_TXFF) && i < 4096; i++)
 830                 writel(0, aaci->base + AACI_DR1);
 831
 832         writel(0, base + AACI_TXCR);
 833
 834         /*
 835          * Re-initialise the AACI after the FIFO depth test, to
 836          * ensure that the FIFOs are empty.  Unfortunately, merely
 837          * disabling the channel doesn't clear the FIFO.
 838          */
 839         writel(aaci->maincr & ~MAINCR_IE, aaci->base + AACI_MAINCR);
 840         writel(aaci->maincr, aaci->base + AACI_MAINCR);
 841
 842         /*
 843          * If we hit 4096, we failed.  Go back to the specified
 844          * fifo depth.
 845          */
 846         if (i == 4096)
 847                 i = 8;
 848
 849         return i;
 850 }
 851
 852 static int __devinit aaci_probe(struct amba_device *dev, void *id)
 853 {
 854         struct aaci *aaci;
 855         int ret, i;
 856
 857         ret = amba_request_regions(dev, NULL);
 858         if (ret)
 859                 return ret;
 860
 861         aaci = aaci_init_card(dev);
 862         if (IS_ERR(aaci)) {
 863                 ret = PTR_ERR(aaci);
 864                 goto out;
 865         }
 866
 867         aaci->base = ioremap(dev->res.start, SZ_4K);
 868         if (!aaci->base) {
 869                 ret = -ENOMEM;
 870                 goto out;
 871         }
 872
 873         /*
 874          * Playback uses AACI channel 0
 875          */
 876         aaci->playback.base = aaci->base + AACI_CSCH1;
 877         aaci->playback.fifo = aaci->base + AACI_DR1;
 878
 879         for (i = 0; i < 4; i++) {
 880                 void *base = aaci->base + i * 0x14;
 881
 882                 writel(0, base + AACI_IE);
 883                 writel(0, base + AACI_TXCR);
 884                 writel(0, base + AACI_RXCR);
 885         }
 886
 887         writel(0x1fff, aaci->base + AACI_INTCLR);
 888         writel(aaci->maincr, aaci->base + AACI_MAINCR);
 889
 890         /*
 891          * Size the FIFOs.
 892          */
 893         aaci->fifosize = aaci_size_fifo(aaci);
 894
 895         ret = aaci_probe_ac97(aaci);
 896         if (ret)
 897                 goto out;
 898
 899         ret = aaci_init_pcm(aaci);
 900         if (ret)
 901                 goto out;
 902
 903         ret = snd_card_register(aaci->card);
 904         if (ret == 0) {
 905                 dev_info(&dev->dev, "%s, fifo %d\n", aaci->card->longname,
 906                         aaci->fifosize);
 907                 amba_set_drvdata(dev, aaci->card);
 908                 return ret;
 909         }
 910
 911  out:
 912         if (aaci)
 913                 snd_card_free(aaci->card);
 914         amba_release_regions(dev);
 915         return ret;
 916 }
 917
 918 static int __devexit aaci_remove(struct amba_device *dev)
 919 {
 920         snd_card_t *card = amba_get_drvdata(dev);
 921
 922         amba_set_drvdata(dev, NULL);
 923
 924         if (card) {
 925                 struct aaci *aaci = card->private_data;
 926                 writel(0, aaci->base + AACI_MAINCR);
 927
 928                 snd_card_free(card);
 929                 amba_release_regions(dev);
 930         }
 931
 932         return 0;
 933 }
 934
 935 static struct amba_id aaci_ids[] = {
 936         {
 937                 .id     = 0x00041041,
 938                 .mask   = 0x000fffff,
 939         },
 940         { 0, 0 },
 941 };
 942
 943 static struct amba_driver aaci_driver = {
 944         .drv            = {
 945                 .name   = DRIVER_NAME,
 946         },
 947         .probe          = aaci_probe,
 948         .remove         = __devexit_p(aaci_remove),
 949         .suspend        = aaci_suspend,
 950         .resume         = aaci_resume,
 951         .id_table       = aaci_ids,
 952 };
 953
 954 static int __init aaci_init(void)
 955 {
 956         return amba_driver_register(&aaci_driver);
 957 }
 958
 959 static void __exit aaci_exit(void)
 960 {
 961         amba_driver_unregister(&aaci_driver);
 962 }
 963
 964 module_init(aaci_init);
 965 module_exit(aaci_exit);
 966
 967 MODULE_LICENSE("GPL");
 968 MODULE_DESCRIPTION("ARM PrimeCell PL041 Advanced Audio CODEC Interface driver");