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davinci-sffsdr.c

/*
 * ASoC driver for Lyrtech SFFSDR board.
 *
 * Author:  Hugo Villeneuve
 * Copyright (C) 2008 Lyrtech inc
 *
 * Based on ASoC driver for TI DAVINCI EVM platform, original copyright follow:
 * Copyright:   (C) 2007 MontaVista Software, Inc., <source@mvista.com>
 *
 * 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.
 */

#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/timer.h>
#include <linux/interrupt.h>
#include <linux/platform_device.h>
#include <linux/gpio.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/soc.h>

#include <asm/dma.h>
#include <asm/mach-types.h>
#ifdef CONFIG_SFFSDR_FPGA
#include <asm/plat-sffsdr/sffsdr-fpga.h>
#endif

#include <mach/edma.h>

#include "../codecs/pcm3008.h"
#include "davinci-pcm.h"
#include "davinci-i2s.h"

/*
 * CLKX and CLKR are the inputs for the Sample Rate Generator.
 * FSX and FSR are outputs, driven by the sample Rate Generator.
 */
#define AUDIO_FORMAT (SND_SOC_DAIFMT_DSP_B |    \
                  SND_SOC_DAIFMT_CBM_CFS |      \
                  SND_SOC_DAIFMT_IB_NF)

static int sffsdr_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_dai *cpu_dai = rtd->cpu_dai;
      int fs;
      int ret = 0;

      /* Fsref can be 32000, 44100 or 48000. */
      fs = params_rate(params);

#ifndef CONFIG_SFFSDR_FPGA
      /* Without the FPGA module, the Fs is fixed at 44100 Hz */
      if (fs != 44100) {
            pr_debug("warning: only 44.1 kHz is supported without SFFSDR FPGA module\n");
            return -EINVAL;
      }
#endif

      /* set cpu DAI configuration */
      ret = snd_soc_dai_set_fmt(cpu_dai, AUDIO_FORMAT);
      if (ret < 0)
            return ret;

      pr_debug("sffsdr_hw_params: rate = %d Hz\n", fs);

#ifndef CONFIG_SFFSDR_FPGA
      return 0;
#else
      return sffsdr_fpga_set_codec_fs(fs);
#endif
}

static struct snd_soc_ops sffsdr_ops = {
      .hw_params = sffsdr_hw_params,
};

/* davinci-sffsdr digital audio interface glue - connects codec <--> CPU */
static struct snd_soc_dai_link sffsdr_dai = {
      .name = "PCM3008", /* Codec name */
      .stream_name = "PCM3008 HiFi",
      .cpu_dai_name = "davinci-mcbsp",
      .codec_dai_name = "pcm3008-hifi",
      .codec_name = "pcm3008-codec",
      .platform_name = "davinci-pcm-audio",
      .ops = &sffsdr_ops,
};

/* davinci-sffsdr audio machine driver */
static struct snd_soc_card snd_soc_sffsdr = {
      .name = "DaVinci SFFSDR",
      .dai_link = &sffsdr_dai,
      .num_links = 1,
};

/* sffsdr audio private data */
static struct pcm3008_setup_data sffsdr_pcm3008_setup = {
      .dem0_pin = GPIO(45),
      .dem1_pin = GPIO(46),
      .pdad_pin = GPIO(47),
      .pdda_pin = GPIO(38),
};

struct platform_device pcm3008_codec = {
            .name = "pcm3008-codec",
            .id = 0,
            .dev = {
                        .platform_data = &sffsdr_pcm3008_setup,
            },
};

static struct resource sffsdr_snd_resources[] = {
      {
            .start = DAVINCI_MCBSP_BASE,
            .end = DAVINCI_MCBSP_BASE + SZ_8K - 1,
            .flags = IORESOURCE_MEM,
      },
};

static struct evm_snd_platform_data sffsdr_snd_data = {
      .tx_dma_ch  = DAVINCI_DMA_MCBSP_TX,
      .rx_dma_ch  = DAVINCI_DMA_MCBSP_RX,
};

static struct platform_device *sffsdr_snd_device;

static int __init sffsdr_init(void)
{
      int ret;

      if (!machine_is_sffsdr())
            return -EINVAL;

      platform_device_register(&pcm3008_codec);

      sffsdr_snd_device = platform_device_alloc("soc-audio", 0);
      if (!sffsdr_snd_device) {
            printk(KERN_ERR "platform device allocation failed\n");
            return -ENOMEM;
      }

      platform_set_drvdata(sffsdr_snd_device, &snd_soc_sffsdr);
      platform_device_add_data(sffsdr_snd_device, &sffsdr_snd_data,
                         sizeof(sffsdr_snd_data));

      ret = platform_device_add_resources(sffsdr_snd_device,
                                  sffsdr_snd_resources,
                                  ARRAY_SIZE(sffsdr_snd_resources));
      if (ret) {
            printk(KERN_ERR "platform device add resources failed\n");
            goto error;
      }

      ret = platform_device_add(sffsdr_snd_device);
      if (ret)
            goto error;

      return ret;

error:
      platform_device_put(sffsdr_snd_device);
      return ret;
}

static void __exit sffsdr_exit(void)
{
      platform_device_unregister(sffsdr_snd_device);
      platform_device_unregister(&pcm3008_codec);
}

module_init(sffsdr_init);
module_exit(sffsdr_exit);

MODULE_AUTHOR("Hugo Villeneuve");
MODULE_DESCRIPTION("Lyrtech SFFSDR ASoC driver");
MODULE_LICENSE("GPL");

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