sound/soc/ux500/ux500_pcm.c

   1 /*
   2  * Copyright (C) ST-Ericsson SA 2012
   3  *
   4  * Author: Ola Lilja <ola.o.lilja@stericsson.com>,
   5  *         Roger Nilsson <roger.xr.nilsson@stericsson.com>
   6  *         for ST-Ericsson.
   7  *
   8  * License terms:
   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 published
  12  * by the Free Software Foundation.
  13  */
  14
  15 #include <asm/page.h>
  16
  17 #include <linux/module.h>
  18 #include <linux/dma-mapping.h>
  19 #include <linux/dmaengine.h>
  20 #include <linux/slab.h>
  21 #include <linux/platform_data/dma-ste-dma40.h>
  22
  23 #include <sound/pcm.h>
  24 #include <sound/pcm_params.h>
  25 #include <sound/soc.h>
  26 #include <sound/dmaengine_pcm.h>
  27
  28 #include "ux500_msp_i2s.h"
  29 #include "ux500_pcm.h"
  30
  31 #define UX500_PLATFORM_PERIODS_BYTES_MIN        128
  32 #define UX500_PLATFORM_PERIODS_BYTES_MAX        (64 * PAGE_SIZE)
  33 #define UX500_PLATFORM_PERIODS_MIN              2
  34 #define UX500_PLATFORM_PERIODS_MAX              48
  35 #define UX500_PLATFORM_BUFFER_BYTES_MAX         (2048 * PAGE_SIZE)
  36
  37 static const struct snd_pcm_hardware ux500_pcm_hw = {
  38         .info = SNDRV_PCM_INFO_INTERLEAVED |
  39                 SNDRV_PCM_INFO_MMAP |
  40                 SNDRV_PCM_INFO_RESUME |
  41                 SNDRV_PCM_INFO_PAUSE,
  42         .buffer_bytes_max = UX500_PLATFORM_BUFFER_BYTES_MAX,
  43         .period_bytes_min = UX500_PLATFORM_PERIODS_BYTES_MIN,
  44         .period_bytes_max = UX500_PLATFORM_PERIODS_BYTES_MAX,
  45         .periods_min = UX500_PLATFORM_PERIODS_MIN,
  46         .periods_max = UX500_PLATFORM_PERIODS_MAX,
  47 };
  48
  49 static struct dma_chan *ux500_pcm_request_chan(struct snd_soc_pcm_runtime *rtd,
  50         struct snd_pcm_substream *substream)
  51 {
  52         struct snd_soc_dai *dai = rtd->cpu_dai;
  53         u16 per_data_width, mem_data_width;
  54         struct stedma40_chan_cfg *dma_cfg;
  55         struct ux500_msp_dma_params *dma_params;
  56
  57         dma_params = snd_soc_dai_get_dma_data(dai, substream);
  58         dma_cfg = dma_params->dma_cfg;
  59
  60         mem_data_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
  61
  62         switch (dma_params->data_size) {
  63         case 32:
  64                 per_data_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
  65                 break;
  66         case 16:
  67                 per_data_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
  68                 break;
  69         case 8:
  70                 per_data_width = DMA_SLAVE_BUSWIDTH_1_BYTE;
  71                 break;
  72         default:
  73                 per_data_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
  74         }
  75
  76         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
  77                 dma_cfg->src_info.data_width = mem_data_width;
  78                 dma_cfg->dst_info.data_width = per_data_width;
  79         } else {
  80                 dma_cfg->src_info.data_width = per_data_width;
  81                 dma_cfg->dst_info.data_width = mem_data_width;
  82         }
  83
  84         return snd_dmaengine_pcm_request_channel(stedma40_filter, dma_cfg);
  85 }
  86
  87 static int ux500_pcm_prepare_slave_config(struct snd_pcm_substream *substream,
  88                 struct snd_pcm_hw_params *params,
  89                 struct dma_slave_config *slave_config)
  90 {
  91         struct snd_soc_pcm_runtime *rtd = substream->private_data;
  92         struct msp_i2s_platform_data *pdata = rtd->cpu_dai->dev->platform_data;
  93         struct snd_dmaengine_dai_dma_data *snd_dma_params;
  94         struct ux500_msp_dma_params *ste_dma_params;
  95         dma_addr_t dma_addr;
  96         int ret;
  97
  98         if (pdata) {
  99                 ste_dma_params =
 100                         snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
 101                 dma_addr = ste_dma_params->tx_rx_addr;
 102         } else {
 103                 snd_dma_params =
 104                         snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
 105                 dma_addr = snd_dma_params->addr;
 106         }
 107
 108         ret = snd_hwparams_to_dma_slave_config(substream, params, slave_config);
 109         if (ret)
 110                 return ret;
 111
 112         slave_config->dst_maxburst = 4;
 113         slave_config->src_maxburst = 4;
 114
 115         slave_config->src_addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
 116         slave_config->dst_addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
 117
 118         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 119                 slave_config->dst_addr = dma_addr;
 120         else
 121                 slave_config->src_addr = dma_addr;
 122
 123         return 0;
 124 }
 125
 126 static const struct snd_dmaengine_pcm_config ux500_dmaengine_pcm_config = {
 127         .pcm_hardware = &ux500_pcm_hw,
 128         .compat_request_channel = ux500_pcm_request_chan,
 129         .prealloc_buffer_size = 128 * 1024,
 130         .prepare_slave_config = ux500_pcm_prepare_slave_config,
 131 };
 132
 133 static const struct snd_dmaengine_pcm_config ux500_dmaengine_of_pcm_config = {
 134         .compat_request_channel = ux500_pcm_request_chan,
 135         .prepare_slave_config = ux500_pcm_prepare_slave_config,
 136 };
 137
 138 int ux500_pcm_register_platform(struct platform_device *pdev)
 139 {
 140         const struct snd_dmaengine_pcm_config *pcm_config;
 141         struct device_node *np = pdev->dev.of_node;
 142         int ret;
 143
 144         if (np)
 145                 pcm_config = &ux500_dmaengine_of_pcm_config;
 146         else
 147                 pcm_config = &ux500_dmaengine_pcm_config;
 148
 149         ret = snd_dmaengine_pcm_register(&pdev->dev, pcm_config,
 150                                          SND_DMAENGINE_PCM_FLAG_COMPAT);
 151         if (ret < 0) {
 152                 dev_err(&pdev->dev,
 153                         "%s: ERROR: Failed to register platform '%s' (%d)!\n",
 154                         __func__, pdev->name, ret);
 155                 return ret;
 156         }
 157
 158         return 0;
 159 }
 160 EXPORT_SYMBOL_GPL(ux500_pcm_register_platform);
 161
 162 int ux500_pcm_unregister_platform(struct platform_device *pdev)
 163 {
 164         snd_dmaengine_pcm_unregister(&pdev->dev);
 165         return 0;
 166 }
 167 EXPORT_SYMBOL_GPL(ux500_pcm_unregister_platform);