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/plat-sffsdr/sffsdr-fpga.h>
  28
  29 #include <mach/mcbsp.h>
  30 #include <mach/edma.h>
  31
  32 #include "../codecs/pcm3008.h"
  33 #include "davinci-pcm.h"
  34 #include "davinci-i2s.h"
  35
  36 static int sffsdr_hw_params(struct snd_pcm_substream *substream,
  37                             struct snd_pcm_hw_params *params,
  38                             struct snd_soc_dai *dai)
  39 {
  40         struct snd_soc_pcm_runtime *rtd = substream->private_data;
  41         struct snd_soc_dai *cpu_dai = rtd->dai->cpu_dai;
  42         int fs;
  43         int ret = 0;
  44
  45         /* Set cpu DAI configuration:
  46          * CLKX and CLKR are the inputs for the Sample Rate Generator.
  47          * FSX and FSR are outputs, driven by the sample Rate Generator. */
  48         ret = snd_soc_dai_set_fmt(cpu_dai,
  49                                   SND_SOC_DAIFMT_RIGHT_J |
  50                                   SND_SOC_DAIFMT_CBM_CFS |
  51                                   SND_SOC_DAIFMT_IB_NF);
  52         if (ret < 0)
  53                 return ret;
  54
  55         /* Fsref can be 32000, 44100 or 48000. */
  56         fs = params_rate(params);
  57
  58         pr_debug("sffsdr_hw_params: rate = %d Hz\n", fs);
  59
  60         return sffsdr_fpga_set_codec_fs(fs);
  61 }
  62
  63 static struct snd_soc_ops sffsdr_ops = {
  64         .hw_params = sffsdr_hw_params,
  65 };
  66
  67 /* davinci-sffsdr digital audio interface glue - connects codec <--> CPU */
  68 static struct snd_soc_dai_link sffsdr_dai = {
  69         .name = "PCM3008", /* Codec name */
  70         .stream_name = "PCM3008 HiFi",
  71         .cpu_dai = &davinci_i2s_dai,
  72         .codec_dai = &pcm3008_dai,
  73         .ops = &sffsdr_ops,
  74 };
  75
  76 /* davinci-sffsdr audio machine driver */
  77 static struct snd_soc_card snd_soc_sffsdr = {
  78         .name = "DaVinci SFFSDR",
  79         .dai_link = &sffsdr_dai,
  80         .num_links = 1,
  81 };
  82
  83 /* sffsdr audio private data */
  84 static struct pcm3008_setup_data sffsdr_pcm3008_setup = {
  85         .dem0_pin = GPIO(45),
  86         .dem1_pin = GPIO(46),
  87         .pdad_pin = GPIO(47),
  88         .pdda_pin = GPIO(38),
  89 };
  90
  91 /* sffsdr audio subsystem */
  92 static struct snd_soc_device sffsdr_snd_devdata = {
  93         .card = &snd_soc_sffsdr,
  94         .platform = &davinci_soc_platform,
  95         .codec_dev = &soc_codec_dev_pcm3008,
  96         .codec_data = &sffsdr_pcm3008_setup,
  97 };
  98
  99 static struct resource sffsdr_snd_resources[] = {
 100         {
 101                 .start = DAVINCI_MCBSP_BASE,
 102                 .end = DAVINCI_MCBSP_BASE + SZ_8K - 1,
 103                 .flags = IORESOURCE_MEM,
 104         },
 105 };
 106
 107 static struct evm_snd_platform_data sffsdr_snd_data = {
 108         .tx_dma_ch      = DAVINCI_DMA_MCBSP_TX,
 109         .rx_dma_ch      = DAVINCI_DMA_MCBSP_RX,
 110 };
 111
 112 static struct platform_device *sffsdr_snd_device;
 113
 114 static int __init sffsdr_init(void)
 115 {
 116         int ret;
 117
 118         sffsdr_snd_device = platform_device_alloc("soc-audio", 0);
 119         if (!sffsdr_snd_device) {
 120                 printk(KERN_ERR "platform device allocation failed\n");
 121                 return -ENOMEM;
 122         }
 123
 124         platform_set_drvdata(sffsdr_snd_device, &sffsdr_snd_devdata);
 125         sffsdr_snd_devdata.dev = &sffsdr_snd_device->dev;
 126         sffsdr_snd_device->dev.platform_data = &sffsdr_snd_data;
 127
 128         ret = platform_device_add_resources(sffsdr_snd_device,
 129                                             sffsdr_snd_resources,
 130                                             ARRAY_SIZE(sffsdr_snd_resources));
 131         if (ret) {
 132                 printk(KERN_ERR "platform device add ressources failed\n");
 133                 goto error;
 134         }
 135
 136         ret = platform_device_add(sffsdr_snd_device);
 137         if (ret)
 138                 goto error;
 139
 140         return ret;
 141
 142 error:
 143         platform_device_put(sffsdr_snd_device);
 144         return ret;
 145 }
 146
 147 static void __exit sffsdr_exit(void)
 148 {
 149         platform_device_unregister(sffsdr_snd_device);
 150 }
 151
 152 module_init(sffsdr_init);
 153 module_exit(sffsdr_exit);
 154
 155 MODULE_AUTHOR("Hugo Villeneuve");
 156 MODULE_DESCRIPTION("Lyrtech SFFSDR ASoC driver");
 157 MODULE_LICENSE("GPL");