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 static int sffsdr_hw_params(struct snd_pcm_substream *substream,
  40                             struct snd_pcm_hw_params *params,
  41                             struct snd_soc_dai *dai)
  42 {
  43         struct snd_soc_pcm_runtime *rtd = substream->private_data;
  44         struct snd_soc_dai *cpu_dai = rtd->dai->cpu_dai;
  45         int fs;
  46         int ret = 0;
  47
  48         /* Fsref can be 32000, 44100 or 48000. */
  49         fs = params_rate(params);
  50
  51 #ifndef CONFIG_SFFSDR_FPGA
  52         /* Without the FPGA module, the Fs is fixed at 44100 Hz */
  53         if (fs != 44100) {
  54                 pr_debug("warning: only 44.1 kHz is supported without SFFSDR FPGA module\n");
  55                 return -EINVAL;
  56         }
  57 #endif
  58
  59         /* Set cpu DAI configuration:
  60          * CLKX and CLKR are the inputs for the Sample Rate Generator.
  61          * FSX and FSR are outputs, driven by the sample Rate Generator. */
  62         ret = snd_soc_dai_set_fmt(cpu_dai,
  63                                   SND_SOC_DAIFMT_RIGHT_J |
  64                                   SND_SOC_DAIFMT_CBM_CFS |
  65                                   SND_SOC_DAIFMT_IB_NF);
  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 = &davinci_i2s_dai,
  87         .codec_dai = &pcm3008_dai,
  88         .ops = &sffsdr_ops,
  89 };
  90
  91 /* davinci-sffsdr audio machine driver */
  92 static struct snd_soc_card snd_soc_sffsdr = {
  93         .name = "DaVinci SFFSDR",
  94         .platform = &davinci_soc_platform,
  95         .dai_link = &sffsdr_dai,
  96         .num_links = 1,
  97 };
  98
  99 /* sffsdr audio private data */
 100 static struct pcm3008_setup_data sffsdr_pcm3008_setup = {
 101         .dem0_pin = GPIO(45),
 102         .dem1_pin = GPIO(46),
 103         .pdad_pin = GPIO(47),
 104         .pdda_pin = GPIO(38),
 105 };
 106
 107 /* sffsdr audio subsystem */
 108 static struct snd_soc_device sffsdr_snd_devdata = {
 109         .card = &snd_soc_sffsdr,
 110         .codec_dev = &soc_codec_dev_pcm3008,
 111         .codec_data = &sffsdr_pcm3008_setup,
 112 };
 113
 114 static struct resource sffsdr_snd_resources[] = {
 115         {
 116                 .start = DAVINCI_MCBSP_BASE,
 117                 .end = DAVINCI_MCBSP_BASE + SZ_8K - 1,
 118                 .flags = IORESOURCE_MEM,
 119         },
 120 };
 121
 122 static struct evm_snd_platform_data sffsdr_snd_data = {
 123         .tx_dma_ch      = DAVINCI_DMA_MCBSP_TX,
 124         .rx_dma_ch      = DAVINCI_DMA_MCBSP_RX,
 125 };
 126
 127 static struct platform_device *sffsdr_snd_device;
 128
 129 static int __init sffsdr_init(void)
 130 {
 131         int ret;
 132
 133         if (!machine_is_sffsdr())
 134                 return -EINVAL;
 135
 136         sffsdr_snd_device = platform_device_alloc("soc-audio", 0);
 137         if (!sffsdr_snd_device) {
 138                 printk(KERN_ERR "platform device allocation failed\n");
 139                 return -ENOMEM;
 140         }
 141
 142         platform_set_drvdata(sffsdr_snd_device, &sffsdr_snd_devdata);
 143         sffsdr_snd_devdata.dev = &sffsdr_snd_device->dev;
 144         sffsdr_snd_device->dev.platform_data = &sffsdr_snd_data;
 145
 146         ret = platform_device_add_resources(sffsdr_snd_device,
 147                                             sffsdr_snd_resources,
 148                                             ARRAY_SIZE(sffsdr_snd_resources));
 149         if (ret) {
 150                 printk(KERN_ERR "platform device add ressources failed\n");
 151                 goto error;
 152         }
 153
 154         ret = platform_device_add(sffsdr_snd_device);
 155         if (ret)
 156                 goto error;
 157
 158         return ret;
 159
 160 error:
 161         platform_device_put(sffsdr_snd_device);
 162         return ret;
 163 }
 164
 165 static void __exit sffsdr_exit(void)
 166 {
 167         platform_device_unregister(sffsdr_snd_device);
 168 }
 169
 170 module_init(sffsdr_init);
 171 module_exit(sffsdr_exit);
 172
 173 MODULE_AUTHOR("Hugo Villeneuve");
 174 MODULE_DESCRIPTION("Lyrtech SFFSDR ASoC driver");
 175 MODULE_LICENSE("GPL");