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aaci.c

/*
 *  linux/sound/arm/aaci.c - ARM PrimeCell AACI PL041 driver
 *
 *  Copyright (C) 2003 Deep Blue Solutions Ltd, All Rights Reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 *  Documentation: ARM DDI 0173B
 */
#include <linux/module.h>
#include <linux/delay.h>
#include <linux/init.h>
#include <linux/ioport.h>
#include <linux/device.h>
#include <linux/spinlock.h>
#include <linux/interrupt.h>
#include <linux/err.h>

#include <asm/io.h>
#include <asm/irq.h>
#include <asm/sizes.h>
#include <asm/hardware/amba.h>

#include <sound/driver.h>
#include <sound/core.h>
#include <sound/initval.h>
#include <sound/ac97_codec.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>

#include "aaci.h"
#include "devdma.h"

#define DRIVER_NAME     "aaci-pl041"

/*
 * PM support is not complete.  Turn it off.
 */
#undef CONFIG_PM

static void aaci_ac97_select_codec(struct aaci *aaci, ac97_t *ac97)
{
      u32 v, maincr = aaci->maincr | MAINCR_SCRA(ac97->num);

      /*
       * Ensure that the slot 1/2 RX registers are empty.
       */
      v = readl(aaci->base + AACI_SLFR);
      if (v & SLFR_2RXV)
            readl(aaci->base + AACI_SL2RX);
      if (v & SLFR_1RXV)
            readl(aaci->base + AACI_SL1RX);

      writel(maincr, aaci->base + AACI_MAINCR);
}

/*
 * P29:
 *  The recommended use of programming the external codec through slot 1
 *  and slot 2 data is to use the channels during setup routines and the
 *  slot register at any other time.  The data written into slot 1, slot 2
 *  and slot 12 registers is transmitted only when their corresponding
 *  SI1TxEn, SI2TxEn and SI12TxEn bits are set in the AACI_MAINCR
 *  register.
 */
static void aaci_ac97_write(ac97_t *ac97, unsigned short reg, unsigned short val)
{
      struct aaci *aaci = ac97->private_data;
      u32 v;

      if (ac97->num >= 4)
            return;

      down(&aaci->ac97_sem);

      aaci_ac97_select_codec(aaci, ac97);

      /*
       * P54: You must ensure that AACI_SL2TX is always written
       * to, if required, before data is written to AACI_SL1TX.
       */
      writel(val << 4, aaci->base + AACI_SL2TX);
      writel(reg << 12, aaci->base + AACI_SL1TX);

      /*
       * Wait for the transmission of both slots to complete.
       */
      do {
            v = readl(aaci->base + AACI_SLFR);
      } while (v & (SLFR_1TXB|SLFR_2TXB));

      up(&aaci->ac97_sem);
}

/*
 * Read an AC'97 register.
 */
static unsigned short aaci_ac97_read(ac97_t *ac97, unsigned short reg)
{
      struct aaci *aaci = ac97->private_data;
      u32 v;

      if (ac97->num >= 4)
            return ~0;

      down(&aaci->ac97_sem);

      aaci_ac97_select_codec(aaci, ac97);

      /*
       * Write the register address to slot 1.
       */
      writel((reg << 12) | (1 << 19), aaci->base + AACI_SL1TX);

      /*
       * Wait for the transmission to complete.
       */
      do {
            v = readl(aaci->base + AACI_SLFR);
      } while (v & SLFR_1TXB);

      /*
       * Give the AC'97 codec more than enough time
       * to respond. (42us = ~2 frames at 48kHz.)
       */
      udelay(42);

      /*
       * Wait for slot 2 to indicate data.
       */
      do {
            cond_resched();
            v = readl(aaci->base + AACI_SLFR) & (SLFR_1RXV|SLFR_2RXV);
      } while (v != (SLFR_1RXV|SLFR_2RXV));

      v = readl(aaci->base + AACI_SL1RX) >> 12;
      if (v == reg) {
            v = readl(aaci->base + AACI_SL2RX) >> 4;
      } else {
            dev_err(&aaci->dev->dev,
                  "wrong ac97 register read back (%x != %x)\n",
                  v, reg);
            v = ~0;
      }

      up(&aaci->ac97_sem);
      return v;
}

static inline void aaci_chan_wait_ready(struct aaci_runtime *aacirun)
{
      u32 val;
      int timeout = 5000;

      do {
            val = readl(aacirun->base + AACI_SR);
      } while (val & (SR_TXB|SR_RXB) && timeout--);
}



/*
 * Interrupt support.
 */
static void aaci_fifo_irq(struct aaci *aaci, u32 mask)
{
      if (mask & ISR_URINTR) {
            writel(ICLR_TXUEC1, aaci->base + AACI_INTCLR);
      }

      if (mask & ISR_TXINTR) {
            struct aaci_runtime *aacirun = &aaci->playback;
            void *ptr;

            if (!aacirun->substream || !aacirun->start) {
                  dev_warn(&aaci->dev->dev, "TX interrupt???");
                  writel(0, aacirun->base + AACI_IE);
                  return;
            }

            ptr = aacirun->ptr;
            do {
                  unsigned int len = aacirun->fifosz;
                  u32 val;

                  if (aacirun->bytes <= 0) {
                        aacirun->bytes += aacirun->period;
                        aacirun->ptr = ptr;
                        spin_unlock(&aaci->lock);
                        snd_pcm_period_elapsed(aacirun->substream);
                        spin_lock(&aaci->lock);
                  }
                  if (!(aacirun->cr & TXCR_TXEN))
                        break;

                  val = readl(aacirun->base + AACI_SR);
                  if (!(val & SR_TXHE))
                        break;
                  if (!(val & SR_TXFE))
                        len >>= 1;

                  aacirun->bytes -= len;

                  /* writing 16 bytes at a time */
                  for ( ; len > 0; len -= 16) {
                        asm(
                              "ldmia      %0!, {r0, r1, r2, r3}\n\t"
                              "stmia      %1, {r0, r1, r2, r3}"
                              : "+r" (ptr)
                              : "r" (aacirun->fifo)
                              : "r0", "r1", "r2", "r3", "cc");

                        if (ptr >= aacirun->end)
                              ptr = aacirun->start;
                  }
            } while (1);

            aacirun->ptr = ptr;
      }
}

static irqreturn_t aaci_irq(int irq, void *devid, struct pt_regs *regs)
{
      struct aaci *aaci = devid;
      u32 mask;
      int i;

      spin_lock(&aaci->lock);
      mask = readl(aaci->base + AACI_ALLINTS);
      if (mask) {
            u32 m = mask;
            for (i = 0; i < 4; i++, m >>= 7) {
                  if (m & 0x7f) {
                        aaci_fifo_irq(aaci, m);
                  }
            }
      }
      spin_unlock(&aaci->lock);

      return mask ? IRQ_HANDLED : IRQ_NONE;
}



/*
 * ALSA support.
 */

struct aaci_stream {
      unsigned char codec_idx;
      unsigned char rate_idx;
};

static struct aaci_stream aaci_streams[] = {
      [ACSTREAM_FRONT] = {
            .codec_idx  = 0,
            .rate_idx   = AC97_RATES_FRONT_DAC,
      },
      [ACSTREAM_SURROUND] = {
            .codec_idx  = 0,
            .rate_idx   = AC97_RATES_SURR_DAC,
      },
      [ACSTREAM_LFE] = {
            .codec_idx  = 0,
            .rate_idx   = AC97_RATES_LFE_DAC,
      },
};

static inline unsigned int aaci_rate_mask(struct aaci *aaci, int streamid)
{
      struct aaci_stream *s = aaci_streams + streamid;
      return aaci->ac97_bus->codec[s->codec_idx]->rates[s->rate_idx];
}

static unsigned int rate_list[] = {
      5512, 8000, 11025, 16000, 22050, 32000, 44100,
      48000, 64000, 88200, 96000, 176400, 192000
};

/*
 * Double-rate rule: we can support double rate iff channels == 2
 *  (unimplemented)
 */
static int
aaci_rule_rate_by_channels(snd_pcm_hw_params_t *p, snd_pcm_hw_rule_t *rule)
{
      struct aaci *aaci = rule->private;
      unsigned int rate_mask = SNDRV_PCM_RATE_8000_48000|SNDRV_PCM_RATE_5512;
      snd_interval_t *c = hw_param_interval(p, SNDRV_PCM_HW_PARAM_CHANNELS);

      switch (c->max) {
      case 6:
            rate_mask &= aaci_rate_mask(aaci, ACSTREAM_LFE);
      case 4:
            rate_mask &= aaci_rate_mask(aaci, ACSTREAM_SURROUND);
      case 2:
            rate_mask &= aaci_rate_mask(aaci, ACSTREAM_FRONT);
      }

      return snd_interval_list(hw_param_interval(p, rule->var),
                         ARRAY_SIZE(rate_list), rate_list,
                         rate_mask);
}

static snd_pcm_hardware_t aaci_hw_info = {
      .info             = SNDRV_PCM_INFO_MMAP |
                          SNDRV_PCM_INFO_MMAP_VALID |
                          SNDRV_PCM_INFO_INTERLEAVED |
                          SNDRV_PCM_INFO_BLOCK_TRANSFER |
                          SNDRV_PCM_INFO_RESUME,

      /*
       * ALSA doesn't support 18-bit or 20-bit packed into 32-bit
       * words.  It also doesn't support 12-bit at all.
       */
      .formats          = SNDRV_PCM_FMTBIT_S16_LE,

      /* should this be continuous or knot? */
      .rates                  = SNDRV_PCM_RATE_CONTINUOUS,
      .rate_max         = 48000,
      .rate_min         = 4000,
      .channels_min           = 2,
      .channels_max           = 6,
      .buffer_bytes_max = 64 * 1024,
      .period_bytes_min = 256,
      .period_bytes_max = PAGE_SIZE,
      .periods_min            = 4,
      .periods_max            = PAGE_SIZE / 16,
};

static int aaci_pcm_open(struct aaci *aaci, snd_pcm_substream_t *substream,
                   struct aaci_runtime *aacirun)
{
      snd_pcm_runtime_t *runtime = substream->runtime;
      int ret;

      aacirun->substream = substream;
      runtime->private_data = aacirun;
      runtime->hw = aaci_hw_info;

      /*
       * FIXME: ALSA specifies fifo_size in bytes.  If we're in normal
       * mode, each 32-bit word contains one sample.  If we're in
       * compact mode, each 32-bit word contains two samples, effectively
       * halving the FIFO size.  However, we don't know for sure which
       * we'll be using at this point.  We set this to the lower limit.
       */
      runtime->hw.fifo_size = aaci->fifosize * 2;

      /*
       * Add rule describing hardware rate dependency
       * on the number of channels.
       */
      ret = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
                          aaci_rule_rate_by_channels, aaci,
                          SNDRV_PCM_HW_PARAM_CHANNELS,
                          SNDRV_PCM_HW_PARAM_RATE, -1);
      if (ret)
            goto out;

      ret = request_irq(aaci->dev->irq[0], aaci_irq, SA_SHIRQ|SA_INTERRUPT,
                    DRIVER_NAME, aaci);
      if (ret)
            goto out;

      return 0;

 out:
      return ret;
}


/*
 * Common ALSA stuff
 */
static int aaci_pcm_close(snd_pcm_substream_t *substream)
{
      struct aaci *aaci = substream->private_data;
      struct aaci_runtime *aacirun = substream->runtime->private_data;

      WARN_ON(aacirun->cr & TXCR_TXEN);

      aacirun->substream = NULL;
      free_irq(aaci->dev->irq[0], aaci);

      return 0;
}

static int aaci_pcm_hw_free(snd_pcm_substream_t *substream)
{
      struct aaci_runtime *aacirun = substream->runtime->private_data;

      /*
       * This must not be called with the device enabled.
       */
      WARN_ON(aacirun->cr & TXCR_TXEN);

      if (aacirun->pcm_open)
            snd_ac97_pcm_close(aacirun->pcm);
      aacirun->pcm_open = 0;

      /*
       * Clear out the DMA and any allocated buffers.
       */
      devdma_hw_free(NULL, substream);

      return 0;
}

static int aaci_pcm_hw_params(snd_pcm_substream_t *substream,
                        struct aaci_runtime *aacirun,
                        snd_pcm_hw_params_t *params)
{
      int err;

      aaci_pcm_hw_free(substream);

      err = devdma_hw_alloc(NULL, substream,
                        params_buffer_bytes(params));
      if (err < 0)
            goto out;

      err = snd_ac97_pcm_open(aacirun->pcm, params_rate(params),
                        params_channels(params),
                        aacirun->pcm->r[0].slots);
      if (err)
            goto out;

      aacirun->pcm_open = 1;

 out:
      return err;
}

static int aaci_pcm_prepare(snd_pcm_substream_t *substream)
{
      snd_pcm_runtime_t *runtime = substream->runtime;
      struct aaci_runtime *aacirun = runtime->private_data;

      aacirun->start    = (void *)runtime->dma_area;
      aacirun->end      = aacirun->start + runtime->dma_bytes;
      aacirun->ptr      = aacirun->start;
      aacirun->period   =
      aacirun->bytes    = frames_to_bytes(runtime, runtime->period_size);

      return 0;
}

static snd_pcm_uframes_t aaci_pcm_pointer(snd_pcm_substream_t *substream)
{
      snd_pcm_runtime_t *runtime = substream->runtime;
      struct aaci_runtime *aacirun = runtime->private_data;
      ssize_t bytes = aacirun->ptr - aacirun->start;

      return bytes_to_frames(runtime, bytes);
}

static int aaci_pcm_mmap(snd_pcm_substream_t *substream, struct vm_area_struct *vma)
{
      return devdma_mmap(NULL, substream, vma);
}


/*
 * Playback specific ALSA stuff
 */
static const u32 channels_to_txmask[] = {
      [2] = TXCR_TX3 | TXCR_TX4,
      [4] = TXCR_TX3 | TXCR_TX4 | TXCR_TX7 | TXCR_TX8,
      [6] = TXCR_TX3 | TXCR_TX4 | TXCR_TX7 | TXCR_TX8 | TXCR_TX6 | TXCR_TX9,
};

/*
 * We can support two and four channel audio.  Unfortunately
 * six channel audio requires a non-standard channel ordering:
 *   2 -> FL(3), FR(4)
 *   4 -> FL(3), FR(4), SL(7), SR(8)
 *   6 -> FL(3), FR(4), SL(7), SR(8), C(6), LFE(9) (required)
 *        FL(3), FR(4), C(6), SL(7), SR(8), LFE(9) (actual)
 * This requires an ALSA configuration file to correct.
 */
static unsigned int channel_list[] = { 2, 4, 6 };

static int
aaci_rule_channels(snd_pcm_hw_params_t *p, snd_pcm_hw_rule_t *rule)
{
      struct aaci *aaci = rule->private;
      unsigned int chan_mask = 1 << 0, slots;

      /*
       * pcms[0] is the our 5.1 PCM instance.
       */
      slots = aaci->ac97_bus->pcms[0].r[0].slots;
      if (slots & (1 << AC97_SLOT_PCM_SLEFT)) {
            chan_mask |= 1 << 1;
            if (slots & (1 << AC97_SLOT_LFE))
                  chan_mask |= 1 << 2;
      }

      return snd_interval_list(hw_param_interval(p, rule->var),
                         ARRAY_SIZE(channel_list), channel_list,
                         chan_mask);
}

static int aaci_pcm_playback_open(snd_pcm_substream_t *substream)
{
      struct aaci *aaci = substream->private_data;
      int ret;

      /*
       * Add rule describing channel dependency.
       */
      ret = snd_pcm_hw_rule_add(substream->runtime, 0,
                          SNDRV_PCM_HW_PARAM_CHANNELS,
                          aaci_rule_channels, aaci,
                          SNDRV_PCM_HW_PARAM_CHANNELS, -1);
      if (ret)
            return ret;

      return aaci_pcm_open(aaci, substream, &aaci->playback);
}

static int aaci_pcm_playback_hw_params(snd_pcm_substream_t *substream,
                               snd_pcm_hw_params_t *params)
{
      struct aaci *aaci = substream->private_data;
      struct aaci_runtime *aacirun = substream->runtime->private_data;
      unsigned int channels = params_channels(params);
      int ret;

      WARN_ON(channels >= ARRAY_SIZE(channels_to_txmask) ||
            !channels_to_txmask[channels]);

      ret = aaci_pcm_hw_params(substream, aacirun, params);

      /*
       * Enable FIFO, compact mode, 16 bits per sample.
       * FIXME: double rate slots?
       */
      if (ret >= 0) {
            aacirun->cr = TXCR_FEN | TXCR_COMPACT | TXCR_TSZ16;
            aacirun->cr |= channels_to_txmask[channels];

            aacirun->fifosz   = aaci->fifosize * 4;
            if (aacirun->cr & TXCR_COMPACT)
                  aacirun->fifosz >>= 1;
      }
      return ret;
}

static void aaci_pcm_playback_stop(struct aaci_runtime *aacirun)
{
      u32 ie;

      ie = readl(aacirun->base + AACI_IE);
      ie &= ~(IE_URIE|IE_TXIE);
      writel(ie, aacirun->base + AACI_IE);
      aacirun->cr &= ~TXCR_TXEN;
      aaci_chan_wait_ready(aacirun);
      writel(aacirun->cr, aacirun->base + AACI_TXCR);
}

static void aaci_pcm_playback_start(struct aaci_runtime *aacirun)
{
      u32 ie;

      aaci_chan_wait_ready(aacirun);
      aacirun->cr |= TXCR_TXEN;

      ie = readl(aacirun->base + AACI_IE);
      ie |= IE_URIE | IE_TXIE;
      writel(ie, aacirun->base + AACI_IE);
      writel(aacirun->cr, aacirun->base + AACI_TXCR);
}

static int aaci_pcm_playback_trigger(snd_pcm_substream_t *substream, int cmd)
{
      struct aaci *aaci = substream->private_data;
      struct aaci_runtime *aacirun = substream->runtime->private_data;
      unsigned long flags;
      int ret = 0;

      spin_lock_irqsave(&aaci->lock, flags);
      switch (cmd) {
      case SNDRV_PCM_TRIGGER_START:
            aaci_pcm_playback_start(aacirun);
            break;

      case SNDRV_PCM_TRIGGER_RESUME:
            aaci_pcm_playback_start(aacirun);
            break;

      case SNDRV_PCM_TRIGGER_STOP:
            aaci_pcm_playback_stop(aacirun);
            break;

      case SNDRV_PCM_TRIGGER_SUSPEND:
            aaci_pcm_playback_stop(aacirun);
            break;

      case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
            break;

      case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
            break;

      default:
            ret = -EINVAL;
      }
      spin_unlock_irqrestore(&aaci->lock, flags);

      return ret;
}

static snd_pcm_ops_t aaci_playback_ops = {
      .open       = aaci_pcm_playback_open,
      .close            = aaci_pcm_close,
      .ioctl            = snd_pcm_lib_ioctl,
      .hw_params  = aaci_pcm_playback_hw_params,
      .hw_free    = aaci_pcm_hw_free,
      .prepare    = aaci_pcm_prepare,
      .trigger    = aaci_pcm_playback_trigger,
      .pointer    = aaci_pcm_pointer,
      .mmap       = aaci_pcm_mmap,
};



/*
 * Power Management.
 */
#ifdef CONFIG_PM
static int aaci_do_suspend(snd_card_t *card, unsigned int state)
{
      struct aaci *aaci = card->private_data;
      if (aaci->card->power_state != SNDRV_CTL_POWER_D3cold) {
            snd_pcm_suspend_all(aaci->pcm);
            snd_power_change_state(aaci->card, SNDRV_CTL_POWER_D3cold);
      }
      return 0;
}

static int aaci_do_resume(snd_card_t *card, unsigned int state)
{
      struct aaci *aaci = card->private_data;
      if (aaci->card->power_state != SNDRV_CTL_POWER_D0) {
            snd_power_change_state(aaci->card, SNDRV_CTL_POWER_D0);
      }
      return 0;
}

static int aaci_suspend(struct amba_device *dev, pm_message_t state)
{
      snd_card_t *card = amba_get_drvdata(dev);
      return card ? aaci_do_suspend(card) : 0;
}

static int aaci_resume(struct amba_device *dev)
{
      snd_card_t *card = amba_get_drvdata(dev);
      return card ? aaci_do_resume(card) : 0;
}
#else
#define aaci_do_suspend       NULL
#define aaci_do_resume        NULL
#define aaci_suspend          NULL
#define aaci_resume           NULL
#endif


static struct ac97_pcm ac97_defs[] __devinitdata = {
      [0] = {           /* Front PCM */
            .exclusive = 1,
            .r = {
                  [0] = {
                        .slots      = (1 << AC97_SLOT_PCM_LEFT) |
                                (1 << AC97_SLOT_PCM_RIGHT) |
                                (1 << AC97_SLOT_PCM_CENTER) |
                                (1 << AC97_SLOT_PCM_SLEFT) |
                                (1 << AC97_SLOT_PCM_SRIGHT) |
                                (1 << AC97_SLOT_LFE),
                  },
            },
      },
      [1] = {     /* PCM in */
            .stream = 1,
            .exclusive = 1,
            .r = {
                  [0] = {
                        .slots      = (1 << AC97_SLOT_PCM_LEFT) |
                                (1 << AC97_SLOT_PCM_RIGHT),
                  },
            },
      },
      [2] = {     /* Mic in */
            .stream = 1,
            .exclusive = 1,
            .r = {
                  [0] = {
                        .slots      = (1 << AC97_SLOT_MIC),
                  },
            },
      }
};

static ac97_bus_ops_t aaci_bus_ops = {
      .write      = aaci_ac97_write,
      .read = aaci_ac97_read,
};

static int __devinit aaci_probe_ac97(struct aaci *aaci)
{
      ac97_template_t ac97_template;
      ac97_bus_t *ac97_bus;
      ac97_t *ac97;
      int ret;

      /*
       * Assert AACIRESET for 2us
       */
      writel(0, aaci->base + AACI_RESET);
      udelay(2);
      writel(RESET_NRST, aaci->base + AACI_RESET);

      /*
       * Give the AC'97 codec more than enough time
       * to wake up. (42us = ~2 frames at 48kHz.)
       */
      udelay(42);

      ret = snd_ac97_bus(aaci->card, 0, &aaci_bus_ops, aaci, &ac97_bus);
      if (ret)
            goto out;

      ac97_bus->clock = 48000;
      aaci->ac97_bus = ac97_bus;

      memset(&ac97_template, 0, sizeof(ac97_template_t));
      ac97_template.private_data = aaci;
      ac97_template.num = 0;
      ac97_template.scaps = AC97_SCAP_SKIP_MODEM;

      ret = snd_ac97_mixer(ac97_bus, &ac97_template, &ac97);
      if (ret)
            goto out;

      /*
       * Disable AC97 PC Beep input on audio codecs.
       */
      if (ac97_is_audio(ac97))
            snd_ac97_write_cache(ac97, AC97_PC_BEEP, 0x801e);

      ret = snd_ac97_pcm_assign(ac97_bus, ARRAY_SIZE(ac97_defs), ac97_defs);
      if (ret)
            goto out;

      aaci->playback.pcm = &ac97_bus->pcms[0];

 out:
      return ret;
}

static void aaci_free_card(snd_card_t *card)
{
      struct aaci *aaci = card->private_data;
      if (aaci->base)
            iounmap(aaci->base);
}

static struct aaci * __devinit aaci_init_card(struct amba_device *dev)
{
      struct aaci *aaci;
      snd_card_t *card;

      card = snd_card_new(SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1,
                      THIS_MODULE, sizeof(struct aaci));
      if (card == NULL)
            return ERR_PTR(-ENOMEM);

      card->private_free = aaci_free_card;
      snd_card_set_pm_callback(card, aaci_do_suspend, aaci_do_resume, NULL);

      strlcpy(card->driver, DRIVER_NAME, sizeof(card->driver));
      strlcpy(card->shortname, "ARM AC'97 Interface", sizeof(card->shortname));
      snprintf(card->longname, sizeof(card->longname),
             "%s at 0x%08lx, irq %d",
             card->shortname, dev->res.start, dev->irq[0]);

      aaci = card->private_data;
      init_MUTEX(&aaci->ac97_sem);
      spin_lock_init(&aaci->lock);
      aaci->card = card;
      aaci->dev = dev;

      /* Set MAINCR to allow slot 1 and 2 data IO */
      aaci->maincr = MAINCR_IE | MAINCR_SL1RXEN | MAINCR_SL1TXEN |
                   MAINCR_SL2RXEN | MAINCR_SL2TXEN;

      return aaci;
}

static int __devinit aaci_init_pcm(struct aaci *aaci)
{
      snd_pcm_t *pcm;
      int ret;

      ret = snd_pcm_new(aaci->card, "AACI AC'97", 0, 1, 0, &pcm);
      if (ret == 0) {
            aaci->pcm = pcm;
            pcm->private_data = aaci;
            pcm->info_flags = 0;

            strlcpy(pcm->name, DRIVER_NAME, sizeof(pcm->name));

            snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &aaci_playback_ops);
      }

      return ret;
}

static unsigned int __devinit aaci_size_fifo(struct aaci *aaci)
{
      void __iomem *base = aaci->base + AACI_CSCH1;
      int i;

      writel(TXCR_FEN | TXCR_TSZ16 | TXCR_TXEN, base + AACI_TXCR);

      for (i = 0; !(readl(base + AACI_SR) & SR_TXFF) && i < 4096; i++)
            writel(0, aaci->base + AACI_DR1);

      writel(0, base + AACI_TXCR);

      /*
       * Re-initialise the AACI after the FIFO depth test, to
       * ensure that the FIFOs are empty.  Unfortunately, merely
       * disabling the channel doesn't clear the FIFO.
       */
      writel(aaci->maincr & ~MAINCR_IE, aaci->base + AACI_MAINCR);
      writel(aaci->maincr, aaci->base + AACI_MAINCR);

      /*
       * If we hit 4096, we failed.  Go back to the specified
       * fifo depth.
       */
      if (i == 4096)
            i = 8;

      return i;
}

static int __devinit aaci_probe(struct amba_device *dev, void *id)
{
      struct aaci *aaci;
      int ret, i;

      ret = amba_request_regions(dev, NULL);
      if (ret)
            return ret;

      aaci = aaci_init_card(dev);
      if (IS_ERR(aaci)) {
            ret = PTR_ERR(aaci);
            goto out;
      }

      aaci->base = ioremap(dev->res.start, SZ_4K);
      if (!aaci->base) {
            ret = -ENOMEM;
            goto out;
      }

      /*
       * Playback uses AACI channel 0
       */
      aaci->playback.base = aaci->base + AACI_CSCH1;
      aaci->playback.fifo = aaci->base + AACI_DR1;

      for (i = 0; i < 4; i++) {
            void __iomem *base = aaci->base + i * 0x14;

            writel(0, base + AACI_IE);
            writel(0, base + AACI_TXCR);
            writel(0, base + AACI_RXCR);
      }

      writel(0x1fff, aaci->base + AACI_INTCLR);
      writel(aaci->maincr, aaci->base + AACI_MAINCR);

      /*
       * Size the FIFOs.
       */
      aaci->fifosize = aaci_size_fifo(aaci);

      ret = aaci_probe_ac97(aaci);
      if (ret)
            goto out;

      ret = aaci_init_pcm(aaci);
      if (ret)
            goto out;

      snd_card_set_dev(aaci->card, &dev->dev);

      ret = snd_card_register(aaci->card);
      if (ret == 0) {
            dev_info(&dev->dev, "%s, fifo %d\n", aaci->card->longname,
                  aaci->fifosize);
            amba_set_drvdata(dev, aaci->card);
            return ret;
      }

 out:
      if (aaci)
            snd_card_free(aaci->card);
      amba_release_regions(dev);
      return ret;
}

static int __devexit aaci_remove(struct amba_device *dev)
{
      snd_card_t *card = amba_get_drvdata(dev);

      amba_set_drvdata(dev, NULL);

      if (card) {
            struct aaci *aaci = card->private_data;
            writel(0, aaci->base + AACI_MAINCR);

            snd_card_free(card);
            amba_release_regions(dev);
      }

      return 0;
}

static struct amba_id aaci_ids[] = {
      {
            .id   = 0x00041041,
            .mask = 0x000fffff,
      },
      { 0, 0 },
};

static struct amba_driver aaci_driver = {
      .drv        = {
            .name = DRIVER_NAME,
      },
      .probe            = aaci_probe,
      .remove           = __devexit_p(aaci_remove),
      .suspend    = aaci_suspend,
      .resume           = aaci_resume,
      .id_table   = aaci_ids,
};

static int __init aaci_init(void)
{
      return amba_driver_register(&aaci_driver);
}

static void __exit aaci_exit(void)
{
      amba_driver_unregister(&aaci_driver);
}

module_init(aaci_init);
module_exit(aaci_exit);

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("ARM PrimeCell PL041 Advanced Audio CODEC Interface driver");

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