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
  25 #include <asm/dma.h>
  26 #include <asm/mach-types.h>
  27 #ifdef CONFIG_SFFSDR_FPGA
  28 #include <asm/plat-sffsdr/sffsdr-fpga.h>
  29 #endif
  30
  31 #include <mach/edma.h>
  32
  33 #include "../codecs/pcm3008.h"
  34 #include "davinci-pcm.h"
  35 #include "davinci-i2s.h"
  36
  37 /*
  38  * CLKX and CLKR are the inputs for the Sample Rate Generator.
  39  * FSX and FSR are outputs, driven by the sample Rate Generator.
  40  */
  41 #define AUDIO_FORMAT (SND_SOC_DAIFMT_DSP_B |    \
  42                       SND_SOC_DAIFMT_CBM_CFS |  \
  43                       SND_SOC_DAIFMT_IB_NF)
  44
  45 static int sffsdr_hw_params(struct snd_pcm_substream *substream,
  46                             struct snd_pcm_hw_params *params)
  47 {
  48         struct snd_soc_pcm_runtime *rtd = substream->private_data;
  49         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
  50         int fs;
  51         int ret = 0;
  52
  53         /* Fsref can be 32000, 44100 or 48000. */
  54         fs = params_rate(params);
  55
  56 #ifndef CONFIG_SFFSDR_FPGA
  57         /* Without the FPGA module, the Fs is fixed at 44100 Hz */
  58         if (fs != 44100) {
  59                 pr_debug("warning: only 44.1 kHz is supported without SFFSDR FPGA module\n");
  60                 return -EINVAL;
  61         }
  62 #endif
  63
  64         /* set cpu DAI configuration */
  65         ret = snd_soc_dai_set_fmt(cpu_dai, AUDIO_FORMAT);
  66         if (ret < 0)
  67                 return ret;
  68
  69         pr_debug("sffsdr_hw_params: rate = %d Hz\n", fs);
  70
  71 #ifndef CONFIG_SFFSDR_FPGA
  72         return 0;
  73 #else
  74         return sffsdr_fpga_set_codec_fs(fs);
  75 #endif
  76 }
  77
  78 static struct snd_soc_ops sffsdr_ops = {
  79         .hw_params = sffsdr_hw_params,
  80 };
  81
  82 /* davinci-sffsdr digital audio interface glue - connects codec <--> CPU */
  83 static struct snd_soc_dai_link sffsdr_dai = {
  84         .name = "PCM3008", /* Codec name */
  85         .stream_name = "PCM3008 HiFi",
  86         .cpu_dai_name = "davinci-mcbsp",
  87         .codec_dai_name = "pcm3008-hifi",
  88         .codec_name = "pcm3008-codec",
  89         .platform_name = "davinci-pcm-audio",
  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         .dai_link = &sffsdr_dai,
  97         .num_links = 1,
  98 };
  99
 100 /* sffsdr audio private data */
 101 static struct pcm3008_setup_data sffsdr_pcm3008_setup = {
 102         .dem0_pin = GPIO(45),
 103         .dem1_pin = GPIO(46),
 104         .pdad_pin = GPIO(47),
 105         .pdda_pin = GPIO(38),
 106 };
 107
 108 struct platform_device pcm3008_codec = {
 109                 .name = "pcm3008-codec",
 110                 .id = 0,
 111                 .dev = {
 112                                 .platform_data = &sffsdr_pcm3008_setup,
 113                 },
 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         platform_device_register(&pcm3008_codec);
 139
 140         sffsdr_snd_device = platform_device_alloc("soc-audio", 0);
 141         if (!sffsdr_snd_device) {
 142                 printk(KERN_ERR "platform device allocation failed\n");
 143                 return -ENOMEM;
 144         }
 145
 146         platform_set_drvdata(sffsdr_snd_device, &snd_soc_sffsdr);
 147         platform_device_add_data(sffsdr_snd_device, &sffsdr_snd_data,
 148                                  sizeof(sffsdr_snd_data));
 149
 150         ret = platform_device_add_resources(sffsdr_snd_device,
 151                                             sffsdr_snd_resources,
 152                                             ARRAY_SIZE(sffsdr_snd_resources));
 153         if (ret) {
 154                 printk(KERN_ERR "platform device add resources failed\n");
 155                 goto error;
 156         }
 157
 158         ret = platform_device_add(sffsdr_snd_device);
 159         if (ret)
 160                 goto error;
 161
 162         return ret;
 163
 164 error:
 165         platform_device_put(sffsdr_snd_device);
 166         return ret;
 167 }
 168
 169 static void __exit sffsdr_exit(void)
 170 {
 171         platform_device_unregister(sffsdr_snd_device);
 172         platform_device_unregister(&pcm3008_codec);
 173 }
 174
 175 module_init(sffsdr_init);
 176 module_exit(sffsdr_exit);
 177
 178 MODULE_AUTHOR("Hugo Villeneuve");
 179 MODULE_DESCRIPTION("Lyrtech SFFSDR ASoC driver");
 180 MODULE_LICENSE("GPL");