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
  47 static 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
  80 static struct snd_soc_ops sffsdr_ops = {
  81         .hw_params = sffsdr_hw_params,
  82 };
  83
  84 /* davinci-sffsdr digital audio interface glue - connects codec <--> CPU */
  85 static 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 */
  94 static 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 */
 102 static 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 */
 110 static 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
 116 static 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
 124 static 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
 129 static struct platform_device *sffsdr_snd_device;
 130
 131 static 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
 163 error:
 164         platform_device_put(sffsdr_snd_device);
 165         return ret;
 166 }
 167
 168 static void __exit sffsdr_exit(void)
 169 {
 170         platform_device_unregister(sffsdr_snd_device);
 171 }
 172
 173 module_init(sffsdr_init);
 174 module_exit(sffsdr_exit);
 175
 176 MODULE_AUTHOR("Hugo Villeneuve");
 177 MODULE_DESCRIPTION("Lyrtech SFFSDR ASoC driver");
 178 MODULE_LICENSE("GPL");