LXR linux/sound/soc/davinci/davinci-sffsdr.c

   1/*
   2 * ASoC driver for Lyrtech SFFSDR board.
   3 *
   4 * Author:      Hugo Villeneuve
   5 * Copyright (C) 2008 Lyrtech inc
   6 *
   7 * Based on ASoC driver for TI DAVINCI EVM platform, original copyright follow:
   8 * Copyright:   (C) 2007 MontaVista Software, Inc., <source@mvista.com>
   9 *
  10 * This program is free software; you can redistribute it and/or modify
  11 * it under the terms of the GNU General Public License version 2 as
  12 * published by the Free Software Foundation.
  13 */
  14
  15#include <linux/module.h>
  16#include <linux/moduleparam.h>
  17#include <linux/timer.h>
  18#include <linux/interrupt.h>
  19#include <linux/platform_device.h>
  20#include <linux/gpio.h>
  21#include <sound/core.h>
  22#include <sound/pcm.h>
  23#include <sound/soc.h>
  24#include <sound/soc-dapm.h>
  25
  26#include <asm/dma.h>
  27#include <asm/mach-types.h>
  28#ifdef CONFIG_SFFSDR_FPGA
  29#include <asm/plat-sffsdr/sffsdr-fpga.h>
  30#endif
  31
  32#include <mach/mcbsp.h>
  33#include <mach/edma.h>
  34
  35#include "../codecs/pcm3008.h"
  36#include "davinci-pcm.h"
  37#include "davinci-i2s.h"
  38
  39/*
  40 * CLKX and CLKR are the inputs for the Sample Rate Generator.
  41 * FSX and FSR are outputs, driven by the sample Rate Generator.
  42 */
  43#define AUDIO_FORMAT (SND_SOC_DAIFMT_DSP_B |    \
  44                      SND_SOC_DAIFMT_CBM_CFS |  \
  45                      SND_SOC_DAIFMT_IB_NF)
  46
  47static int sffsdr_hw_params(struct snd_pcm_substream *substream,
  48                            struct snd_pcm_hw_params *params)
  49{
  50        struct snd_soc_pcm_runtime *rtd = substream->private_data;
  51        struct snd_soc_dai *cpu_dai = rtd->dai->cpu_dai;
  52        int fs;
  53        int ret = 0;
  54
  55        /* Fsref can be 32000, 44100 or 48000. */
  56        fs = params_rate(params);
  57
  58#ifndef CONFIG_SFFSDR_FPGA
  59        /* Without the FPGA module, the Fs is fixed at 44100 Hz */
  60        if (fs != 44100) {
  61                pr_debug("warning: only 44.1 kHz is supported without SFFSDR FPGA module\n");
  62                return -EINVAL;
  63        }
  64#endif
  65
  66        /* set cpu DAI configuration */
  67        ret = snd_soc_dai_set_fmt(cpu_dai, AUDIO_FORMAT);
  68        if (ret < 0)
  69                return ret;
  70
  71        pr_debug("sffsdr_hw_params: rate = %d Hz\n", fs);
  72
  73#ifndef CONFIG_SFFSDR_FPGA
  74        return 0;
  75#else
  76        return sffsdr_fpga_set_codec_fs(fs);
  77#endif
  78}
  79
  80static struct snd_soc_ops sffsdr_ops = {
  81        .hw_params = sffsdr_hw_params,
  82};
  83
  84/* davinci-sffsdr digital audio interface glue - connects codec <--> CPU */
  85static struct snd_soc_dai_link sffsdr_dai = {
  86        .name = "PCM3008", /* Codec name */
  87        .stream_name = "PCM3008 HiFi",
  88        .cpu_dai = &davinci_i2s_dai,
  89        .codec_dai = &pcm3008_dai,
  90        .ops = &sffsdr_ops,
  91};
  92
  93/* davinci-sffsdr audio machine driver */
  94static struct snd_soc_card snd_soc_sffsdr = {
  95        .name = "DaVinci SFFSDR",
  96        .platform = &davinci_soc_platform,
  97        .dai_link = &sffsdr_dai,
  98        .num_links = 1,
  99};
 100
 101/* sffsdr audio private data */
 102static struct pcm3008_setup_data sffsdr_pcm3008_setup = {
 103        .dem0_pin = GPIO(45),
 104        .dem1_pin = GPIO(46),
 105        .pdad_pin = GPIO(47),
 106        .pdda_pin = GPIO(38),
 107};
 108
 109/* sffsdr audio subsystem */
 110static struct snd_soc_device sffsdr_snd_devdata = {
 111        .card = &snd_soc_sffsdr,
 112        .codec_dev = &soc_codec_dev_pcm3008,
 113        .codec_data = &sffsdr_pcm3008_setup,
 114};
 115
 116static struct resource sffsdr_snd_resources[] = {
 117        {
 118                .start = DAVINCI_MCBSP_BASE,
 119                .end = DAVINCI_MCBSP_BASE + SZ_8K - 1,
 120                .flags = IORESOURCE_MEM,
 121        },
 122};
 123
 124static struct evm_snd_platform_data sffsdr_snd_data = {
 125        .tx_dma_ch      = DAVINCI_DMA_MCBSP_TX,
 126        .rx_dma_ch      = DAVINCI_DMA_MCBSP_RX,
 127};
 128
 129static struct platform_device *sffsdr_snd_device;
 130
 131static int __init sffsdr_init(void)
 132{
 133        int ret;
 134
 135        if (!machine_is_sffsdr())
 136                return -EINVAL;
 137
 138        sffsdr_snd_device = platform_device_alloc("soc-audio", 0);
 139        if (!sffsdr_snd_device) {
 140                printk(KERN_ERR "platform device allocation failed\n");
 141                return -ENOMEM;
 142        }
 143
 144        platform_set_drvdata(sffsdr_snd_device, &sffsdr_snd_devdata);
 145        sffsdr_snd_devdata.dev = &sffsdr_snd_device->dev;
 146        platform_device_add_data(sffsdr_snd_device, &sffsdr_snd_data,
 147                                 sizeof(sffsdr_snd_data));
 148
 149        ret = platform_device_add_resources(sffsdr_snd_device,
 150                                            sffsdr_snd_resources,
 151                                            ARRAY_SIZE(sffsdr_snd_resources));
 152        if (ret) {
 153                printk(KERN_ERR "platform device add ressources failed\n");
 154                goto error;
 155        }
 156
 157        ret = platform_device_add(sffsdr_snd_device);
 158        if (ret)
 159                goto error;
 160
 161        return ret;
 162
 163error:
 164        platform_device_put(sffsdr_snd_device);
 165        return ret;
 166}
 167
 168static void __exit sffsdr_exit(void)
 169{
 170        platform_device_unregister(sffsdr_snd_device);
 171}
 172
 173module_init(sffsdr_init);
 174module_exit(sffsdr_exit);
 175
 176MODULE_AUTHOR("Hugo Villeneuve");
 177MODULE_DESCRIPTION("Lyrtech SFFSDR ASoC driver");
 178MODULE_LICENSE("GPL");
 179