sound/soc/fsl/imx-pcm-dma.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 #include <linux/types.h>
  25
  26 #include <sound/core.h>
  27 #include <sound/initval.h>
  28 #include <sound/pcm.h>
  29 #include <sound/pcm_params.h>
  30 #include <sound/soc.h>
  31 #include <sound/dmaengine_pcm.h>
  32
  33 #include <linux/platform_data/dma-imx.h>
  34
  35 #include "imx-pcm.h"
  36
  37 static bool filter(struct dma_chan *chan, void *param)
  38 {
  39         if (!imx_dma_is_general_purpose(chan))
  40                 return false;
  41
  42         chan->private = param;
  43
  44         return true;
  45 }
  46
  47 static int snd_imx_pcm_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 dma_chan *chan = snd_dmaengine_pcm_get_chan(substream);
  52         struct imx_pcm_dma_params *dma_params;
  53         struct dma_slave_config slave_config;
  54         int ret;
  55
  56         dma_params = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
  57
  58         ret = snd_hwparams_to_dma_slave_config(substream, params, &slave_config);
  59         if (ret)
  60                 return ret;
  61
  62         slave_config.device_fc = false;
  63
  64         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
  65                 slave_config.dst_addr = dma_params->dma_addr;
  66                 slave_config.dst_maxburst = dma_params->burstsize;
  67         } else {
  68                 slave_config.src_addr = dma_params->dma_addr;
  69                 slave_config.src_maxburst = dma_params->burstsize;
  70         }
  71
  72         ret = dmaengine_slave_config(chan, &slave_config);
  73         if (ret)
  74                 return ret;
  75
  76         snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
  77
  78         return 0;
  79 }
  80
  81 static struct snd_pcm_hardware snd_imx_hardware = {
  82         .info = SNDRV_PCM_INFO_INTERLEAVED |
  83                 SNDRV_PCM_INFO_BLOCK_TRANSFER |
  84                 SNDRV_PCM_INFO_MMAP |
  85                 SNDRV_PCM_INFO_MMAP_VALID |
  86                 SNDRV_PCM_INFO_PAUSE |
  87                 SNDRV_PCM_INFO_RESUME,
  88         .formats = SNDRV_PCM_FMTBIT_S16_LE,
  89         .rate_min = 8000,
  90         .channels_min = 2,
  91         .channels_max = 2,
  92         .buffer_bytes_max = IMX_SSI_DMABUF_SIZE,
  93         .period_bytes_min = 128,
  94         .period_bytes_max = 65535, /* Limited by SDMA engine */
  95         .periods_min = 2,
  96         .periods_max = 255,
  97         .fifo_size = 0,
  98 };
  99
 100 static int snd_imx_open(struct snd_pcm_substream *substream)
 101 {
 102         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 103         struct imx_pcm_dma_params *dma_params;
 104         struct imx_dma_data *dma_data;
 105         int ret;
 106
 107         snd_soc_set_runtime_hwparams(substream, &snd_imx_hardware);
 108
 109         dma_params = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
 110
 111         dma_data = kzalloc(sizeof(*dma_data), GFP_KERNEL);
 112         if (!dma_data)
 113                 return -ENOMEM;
 114
 115         dma_data->peripheral_type = dma_params->shared_peripheral ?
 116                                         IMX_DMATYPE_SSI_SP : IMX_DMATYPE_SSI;
 117         dma_data->priority = DMA_PRIO_HIGH;
 118         dma_data->dma_request = dma_params->dma;
 119
 120         ret = snd_dmaengine_pcm_open(substream, filter, dma_data);
 121         if (ret) {
 122                 kfree(dma_data);
 123                 return ret;
 124         }
 125
 126         snd_dmaengine_pcm_set_data(substream, dma_data);
 127
 128         return 0;
 129 }
 130
 131 static int snd_imx_close(struct snd_pcm_substream *substream)
 132 {
 133         struct imx_dma_data *dma_data = snd_dmaengine_pcm_get_data(substream);
 134
 135         snd_dmaengine_pcm_close(substream);
 136         kfree(dma_data);
 137
 138         return 0;
 139 }
 140
 141 static struct snd_pcm_ops imx_pcm_ops = {
 142         .open           = snd_imx_open,
 143         .close          = snd_imx_close,
 144         .ioctl          = snd_pcm_lib_ioctl,
 145         .hw_params      = snd_imx_pcm_hw_params,
 146         .trigger        = snd_dmaengine_pcm_trigger,
 147         .pointer        = snd_dmaengine_pcm_pointer_no_residue,
 148         .mmap           = snd_imx_pcm_mmap,
 149 };
 150
 151 static struct snd_soc_platform_driver imx_soc_platform_mx2 = {
 152         .ops            = &imx_pcm_ops,
 153         .pcm_new        = imx_pcm_new,
 154         .pcm_free       = imx_pcm_free,
 155 };
 156
 157 int imx_pcm_dma_init(struct platform_device *pdev)
 158 {
 159         return snd_soc_register_platform(&pdev->dev, &imx_soc_platform_mx2);
 160 }