Logo Search packages:      
Sourcecode: alsa-driver version File versions

pxa2xx-i2s.c

/*
 * pxa2xx-i2s.c  --  ALSA Soc Audio Layer
 *
 * Copyright 2005 Wolfson Microelectronics PLC.
 * Author: Liam Girdwood
 *         liam.girdwood@wolfsonmicro.com or linux@wolfsonmicro.com
 *
 *  This program is free software; you can redistribute  it and/or modify it
 *  under  the terms of  the GNU General  Public License as published by the
 *  Free Software Foundation;  either version 2 of the  License, or (at your
 *  option) any later version.
 *
 *  Revision history
 *    12th Aug 2005   Initial version.
 */

#include <linux/init.h>
#include <linux/module.h>
#include <linux/device.h>
#include <linux/delay.h>
#include <sound/driver.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/initval.h>
#include <sound/soc.h>

#include <asm/hardware.h>
#include <asm/arch/pxa-regs.h>
#include <asm/arch/audio.h>

#include "pxa2xx-pcm.h"
#include "pxa2xx-i2s.h"

struct pxa_i2s_port {
      u32 sadiv;
      u32 sacr0;
      u32 sacr1;
      u32 saimr;
      int master;
      u32 fmt;
};
static struct pxa_i2s_port pxa_i2s;

static struct pxa2xx_pcm_dma_params pxa2xx_i2s_pcm_stereo_out = {
      .name             = "I2S PCM Stereo out",
      .dev_addr         = __PREG(SADR),
      .drcmr                  = &DRCMRTXSADR,
      .dcmd             = DCMD_INCSRCADDR | DCMD_FLOWTRG |
                          DCMD_BURST32 | DCMD_WIDTH4,
};

static struct pxa2xx_pcm_dma_params pxa2xx_i2s_pcm_stereo_in = {
      .name             = "I2S PCM Stereo in",
      .dev_addr         = __PREG(SADR),
      .drcmr                  = &DRCMRRXSADR,
      .dcmd             = DCMD_INCTRGADDR | DCMD_FLOWSRC |
                          DCMD_BURST32 | DCMD_WIDTH4,
};

static struct pxa2xx_gpio gpio_bus[] = {
      { /* I2S SoC Slave */
            .rx = GPIO29_SDATA_IN_I2S_MD,
            .tx = GPIO30_SDATA_OUT_I2S_MD,
            .clk = GPIO28_BITCLK_IN_I2S_MD,
            .frm = GPIO31_SYNC_I2S_MD,
      },
      { /* I2S SoC Master */
#ifdef CONFIG_PXA27x
            .sys = GPIO113_I2S_SYSCLK_MD,
#else
            .sys = GPIO32_SYSCLK_I2S_MD,
#endif
            .rx = GPIO29_SDATA_IN_I2S_MD,
            .tx = GPIO30_SDATA_OUT_I2S_MD,
            .clk = GPIO28_BITCLK_OUT_I2S_MD,
            .frm = GPIO31_SYNC_I2S_MD,
      },
};

static int pxa2xx_i2s_startup(struct snd_pcm_substream *substream)
{
      struct snd_soc_pcm_runtime *rtd = substream->private_data;
      struct snd_soc_cpu_dai *cpu_dai = rtd->dai->cpu_dai;

      if (!cpu_dai->active) {
            SACR0 |= SACR0_RST;
            SACR0 = 0;
      }

      return 0;
}

/* wait for I2S controller to be ready */
static int pxa_i2s_wait(void)
{
      int i;

      /* flush the Rx FIFO */
      for(i = 0; i < 16; i++)
            SADR;
      return 0;
}

static int pxa2xx_i2s_set_dai_fmt(struct snd_soc_cpu_dai *cpu_dai,
            unsigned int fmt)
{
      /* interface format */
      switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
      case SND_SOC_DAIFMT_I2S:
            pxa_i2s.fmt = 0;
            break;
      case SND_SOC_DAIFMT_LEFT_J:
            pxa_i2s.fmt = SACR1_AMSL;
            break;
      }

      switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
      case SND_SOC_DAIFMT_CBS_CFS:
            pxa_i2s.master = 1;
            break;
      case SND_SOC_DAIFMT_CBM_CFS:
            pxa_i2s.master = 0;
            break;
      default:
            break;
      }
      return 0;
}

static int pxa2xx_i2s_set_dai_sysclk(struct snd_soc_cpu_dai *cpu_dai,
            int clk_id, unsigned int freq, int dir)
{
      if (clk_id != PXA2XX_I2S_SYSCLK)
            return -ENODEV;

      if (pxa_i2s.master && dir == SND_SOC_CLOCK_OUT)
            pxa_gpio_mode(gpio_bus[pxa_i2s.master].sys);

      return 0;
}

static int pxa2xx_i2s_hw_params(struct snd_pcm_substream *substream,
                        struct snd_pcm_hw_params *params)
{
      struct snd_soc_pcm_runtime *rtd = substream->private_data;
      struct snd_soc_cpu_dai *cpu_dai = rtd->dai->cpu_dai;

      pxa_gpio_mode(gpio_bus[pxa_i2s.master].rx);
      pxa_gpio_mode(gpio_bus[pxa_i2s.master].tx);
      pxa_gpio_mode(gpio_bus[pxa_i2s.master].frm);
      pxa_gpio_mode(gpio_bus[pxa_i2s.master].clk);
      pxa_set_cken(CKEN_I2S, 1);
      pxa_i2s_wait();

      if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
            cpu_dai->dma_data = &pxa2xx_i2s_pcm_stereo_out;
      else
            cpu_dai->dma_data = &pxa2xx_i2s_pcm_stereo_in;

      /* is port used by another stream */
      if (!(SACR0 & SACR0_ENB)) {

            SACR0 = 0;
            SACR1 = 0;
            if (pxa_i2s.master)
                  SACR0 |= SACR0_BCKD;

            SACR0 |= SACR0_RFTH(14) | SACR0_TFTH(1);
            SACR1 |= pxa_i2s.fmt;
      }
      if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
            SAIMR |= SAIMR_TFS;
      else
            SAIMR |= SAIMR_RFS;

      switch (params_rate(params)) {
      case 8000:
            SADIV = 0x48;
            break;
      case 11025:
            SADIV = 0x34;
            break;
      case 16000:
            SADIV = 0x24;
            break;
      case 22050:
            SADIV = 0x1a;
            break;
      case 44100:
            SADIV = 0xd;
            break;
      case 48000:
            SADIV = 0xc;
            break;
      case 96000: /* not in manual and possibly slightly inaccurate */
            SADIV = 0x6;
            break;
      }

      return 0;
}

static int pxa2xx_i2s_trigger(struct snd_pcm_substream *substream, int cmd)
{
      int ret = 0;

      switch (cmd) {
      case SNDRV_PCM_TRIGGER_START:
            SACR0 |= SACR0_ENB;
            break;
      case SNDRV_PCM_TRIGGER_RESUME:
      case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
      case SNDRV_PCM_TRIGGER_STOP:
      case SNDRV_PCM_TRIGGER_SUSPEND:
      case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
            break;
      default:
            ret = -EINVAL;
      }

      return ret;
}

static void pxa2xx_i2s_shutdown(struct snd_pcm_substream *substream)
{
      if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
            SACR1 |= SACR1_DRPL;
            SAIMR &= ~SAIMR_TFS;
      } else {
            SACR1 |= SACR1_DREC;
            SAIMR &= ~SAIMR_RFS;
      }

      if (SACR1 & (SACR1_DREC | SACR1_DRPL)) {
            SACR0 &= ~SACR0_ENB;
            pxa_i2s_wait();
            pxa_set_cken(CKEN_I2S, 0);
      }
}

#ifdef CONFIG_PM
static int pxa2xx_i2s_suspend(struct platform_device *dev,
      struct snd_soc_cpu_dai *dai)
{
      if (!dai->active)
            return 0;

      /* store registers */
      pxa_i2s.sacr0 = SACR0;
      pxa_i2s.sacr1 = SACR1;
      pxa_i2s.saimr = SAIMR;
      pxa_i2s.sadiv = SADIV;

      /* deactivate link */
      SACR0 &= ~SACR0_ENB;
      pxa_i2s_wait();
      return 0;
}

static int pxa2xx_i2s_resume(struct platform_device *pdev,
      struct snd_soc_cpu_dai *dai)
{
      if (!dai->active)
            return 0;

      pxa_i2s_wait();

      SACR0 = pxa_i2s.sacr0 &= ~SACR0_ENB;
      SACR1 = pxa_i2s.sacr1;
      SAIMR = pxa_i2s.saimr;
      SADIV = pxa_i2s.sadiv;
      SACR0 |= SACR0_ENB;

      return 0;
}

#else
#define pxa2xx_i2s_suspend    NULL
#define pxa2xx_i2s_resume     NULL
#endif

#define PXA2XX_I2S_RATES (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 |\
            SNDRV_PCM_RATE_16000 | SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_44100 | \
            SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_96000)

struct snd_soc_cpu_dai pxa_i2s_dai = {
      .name = "pxa2xx-i2s",
      .id = 0,
      .type = SND_SOC_DAI_I2S,
      .suspend = pxa2xx_i2s_suspend,
      .resume = pxa2xx_i2s_resume,
      .playback = {
            .channels_min = 2,
            .channels_max = 2,
            .rates = PXA2XX_I2S_RATES,
            .formats = SNDRV_PCM_FMTBIT_S16_LE,},
      .capture = {
            .channels_min = 2,
            .channels_max = 2,
            .rates = PXA2XX_I2S_RATES,
            .formats = SNDRV_PCM_FMTBIT_S16_LE,},
      .ops = {
            .startup = pxa2xx_i2s_startup,
            .shutdown = pxa2xx_i2s_shutdown,
            .trigger = pxa2xx_i2s_trigger,
            .hw_params = pxa2xx_i2s_hw_params,},
      .dai_ops = {
            .set_fmt = pxa2xx_i2s_set_dai_fmt,
            .set_sysclk = pxa2xx_i2s_set_dai_sysclk,
      },
};

EXPORT_SYMBOL_GPL(pxa_i2s_dai);

/* Module information */
MODULE_AUTHOR("Liam Girdwood, liam.girdwood@wolfsonmicro.com, www.wolfsonmicro.com");
MODULE_DESCRIPTION("pxa2xx I2S SoC Interface");
MODULE_LICENSE("GPL");

Generated by  Doxygen 1.6.0   Back to index