sound/soc/imx/imx-pcm-dma-mx2.c

   1 /*
   2  * imx-pcm-dma-mx2.c  --  ALSA Soc Audio Layer
   3  *
   4  * Copyright 2009 Sascha Hauer <s.hauer@pengutronix.de>
   5  *
   6  * This code is based on code copyrighted by Freescale,
   7  * Liam Girdwood, Javier Martin and probably others.
   8  *
   9  *  This program is free software; you can redistribute  it and/or modify it
  10  *  under  the terms of  the GNU General  Public License as published by the
  11  *  Free Software Foundation;  either version 2 of the  License, or (at your
  12  *  option) any later version.
  13  */
  14 #include <linux/clk.h>
  15 #include <linux/delay.h>
  16 #include <linux/device.h>
  17 #include <linux/dma-mapping.h>
  18 #include <linux/init.h>
  19 #include <linux/interrupt.h>
  20 #include <linux/module.h>
  21 #include <linux/platform_device.h>
  22 #include <linux/slab.h>
  23 #include <linux/dmaengine.h>
  24
  25 #include <sound/core.h>
  26 #include <sound/initval.h>
  27 #include <sound/pcm.h>
  28 #include <sound/pcm_params.h>
  29 #include <sound/soc.h>
  30 #include <sound/dmaengine_pcm.h>
  31
  32 #include <mach/dma.h>
  33
  34 #include "imx-pcm.h"
  35
  36 static bool filter(struct dma_chan *chan, void *param)
  37 {
  38         if (!imx_dma_is_general_purpose(chan))
  39                 return false;
  40
  41         chan->private = param;
  42
  43         return true;
  44 }
  45
  46 static int snd_imx_pcm_hw_params(struct snd_pcm_substream *substream,
  47                                 struct snd_pcm_hw_params *params)
  48 {
  49         struct snd_soc_pcm_runtime *rtd = substream->private_data;
  50         struct dma_chan *chan = snd_dmaengine_pcm_get_chan(substream);
  51         struct imx_pcm_dma_params *dma_params;
  52         struct dma_slave_config slave_config;
  53         int ret;
  54
  55         dma_params = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
  56
  57         ret = snd_hwparams_to_dma_slave_config(substream, params, &slave_config);
  58         if (ret)
  59                 return ret;
  60
  61         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
  62                 slave_config.dst_addr = dma_params->dma_addr;
  63                 slave_config.dst_maxburst = dma_params->burstsize;
  64         } else {
  65                 slave_config.src_addr = dma_params->dma_addr;
  66                 slave_config.src_maxburst = dma_params->burstsize;
  67         }
  68
  69         ret = dmaengine_slave_config(chan, &slave_config);
  70         if (ret)
  71                 return ret;
  72
  73         snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
  74
  75         return 0;
  76 }
  77
  78 static struct snd_pcm_hardware snd_imx_hardware = {
  79         .info = SNDRV_PCM_INFO_INTERLEAVED |
  80                 SNDRV_PCM_INFO_BLOCK_TRANSFER |
  81                 SNDRV_PCM_INFO_MMAP |
  82                 SNDRV_PCM_INFO_MMAP_VALID |
  83                 SNDRV_PCM_INFO_PAUSE |
  84                 SNDRV_PCM_INFO_RESUME,
  85         .formats = SNDRV_PCM_FMTBIT_S16_LE,
  86         .rate_min = 8000,
  87         .channels_min = 2,
  88         .channels_max = 2,
  89         .buffer_bytes_max = IMX_SSI_DMABUF_SIZE,
  90         .period_bytes_min = 128,
  91         .period_bytes_max = 65535, /* Limited by SDMA engine */
  92         .periods_min = 2,
  93         .periods_max = 255,
  94         .fifo_size = 0,
  95 };
  96
  97 static int snd_imx_open(struct snd_pcm_substream *substream)
  98 {
  99         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 100         struct imx_pcm_dma_params *dma_params;
 101         struct imx_dma_data *dma_data;
 102         int ret;
 103
 104         snd_soc_set_runtime_hwparams(substream, &snd_imx_hardware);
 105
 106         dma_params = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
 107
 108         dma_data = kzalloc(sizeof(*dma_data), GFP_KERNEL);
 109         dma_data->peripheral_type = IMX_DMATYPE_SSI;
 110         dma_data->priority = DMA_PRIO_HIGH;
 111         dma_data->dma_request = dma_params->dma;
 112
 113         ret = snd_dmaengine_pcm_open(substream, filter, dma_data);
 114         if (ret) {
 115                 kfree(dma_data);
 116                 return 0;
 117         }
 118
 119         snd_dmaengine_pcm_set_data(substream, dma_data);
 120
 121         return 0;
 122 }
 123
 124 static int snd_imx_close(struct snd_pcm_substream *substream)
 125 {
 126         struct imx_dma_data *dma_data = snd_dmaengine_pcm_get_data(substream);
 127
 128         snd_dmaengine_pcm_close(substream);
 129         kfree(dma_data);
 130
 131         return 0;
 132 }
 133
 134 static struct snd_pcm_ops imx_pcm_ops = {
 135         .open           = snd_imx_open,
 136         .close          = snd_imx_close,
 137         .ioctl          = snd_pcm_lib_ioctl,
 138         .hw_params      = snd_imx_pcm_hw_params,
 139         .trigger        = snd_dmaengine_pcm_trigger,
 140         .pointer        = snd_dmaengine_pcm_pointer,
 141         .mmap           = snd_imx_pcm_mmap,
 142 };
 143
 144 static struct snd_soc_platform_driver imx_soc_platform_mx2 = {
 145         .ops            = &imx_pcm_ops,
 146         .pcm_new        = imx_pcm_new,
 147         .pcm_free       = imx_pcm_free,
 148 };
 149
 150 static int __devinit imx_soc_platform_probe(struct platform_device *pdev)
 151 {
 152         return snd_soc_register_platform(&pdev->dev, &imx_soc_platform_mx2);
 153 }
 154
 155 static int __devexit imx_soc_platform_remove(struct platform_device *pdev)
 156 {
 157         snd_soc_unregister_platform(&pdev->dev);
 158         return 0;
 159 }
 160
 161 static struct platform_driver imx_pcm_driver = {
 162         .driver = {
 163                         .name = "imx-pcm-audio",
 164                         .owner = THIS_MODULE,
 165         },
 166         .probe = imx_soc_platform_probe,
 167         .remove = __devexit_p(imx_soc_platform_remove),
 168 };
 169
 170 module_platform_driver(imx_pcm_driver);
 171 MODULE_LICENSE("GPL");
 172 MODULE_ALIAS("platform:imx-pcm-audio");