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_MIN_RATE 8000
  32 #define UX500_PLATFORM_MAX_RATE 48000
  33
  34 #define UX500_PLATFORM_MIN_CHANNELS 1
  35 #define UX500_PLATFORM_MAX_CHANNELS 8
  36
  37 #define UX500_PLATFORM_PERIODS_BYTES_MIN        128
  38 #define UX500_PLATFORM_PERIODS_BYTES_MAX        (64 * PAGE_SIZE)
  39 #define UX500_PLATFORM_PERIODS_MIN              2
  40 #define UX500_PLATFORM_PERIODS_MAX              48
  41 #define UX500_PLATFORM_BUFFER_BYTES_MAX         (2048 * PAGE_SIZE)
  42
  43 static const struct snd_pcm_hardware ux500_pcm_hw = {
  44         .info = SNDRV_PCM_INFO_INTERLEAVED |
  45                 SNDRV_PCM_INFO_MMAP |
  46                 SNDRV_PCM_INFO_RESUME |
  47                 SNDRV_PCM_INFO_PAUSE,
  48         .formats = SNDRV_PCM_FMTBIT_S16_LE |
  49                 SNDRV_PCM_FMTBIT_U16_LE |
  50                 SNDRV_PCM_FMTBIT_S16_BE |
  51                 SNDRV_PCM_FMTBIT_U16_BE,
  52         .rates = SNDRV_PCM_RATE_KNOT,
  53         .rate_min = UX500_PLATFORM_MIN_RATE,
  54         .rate_max = UX500_PLATFORM_MAX_RATE,
  55         .channels_min = UX500_PLATFORM_MIN_CHANNELS,
  56         .channels_max = UX500_PLATFORM_MAX_CHANNELS,
  57         .buffer_bytes_max = UX500_PLATFORM_BUFFER_BYTES_MAX,
  58         .period_bytes_min = UX500_PLATFORM_PERIODS_BYTES_MIN,
  59         .period_bytes_max = UX500_PLATFORM_PERIODS_BYTES_MAX,
  60         .periods_min = UX500_PLATFORM_PERIODS_MIN,
  61         .periods_max = UX500_PLATFORM_PERIODS_MAX,
  62 };
  63
  64 static struct dma_chan *ux500_pcm_request_chan(struct snd_soc_pcm_runtime *rtd,
  65         struct snd_pcm_substream *substream)
  66 {
  67         struct snd_soc_dai *dai = rtd->cpu_dai;
  68         u16 per_data_width, mem_data_width;
  69         struct stedma40_chan_cfg *dma_cfg;
  70         struct ux500_msp_dma_params *dma_params;
  71
  72         dma_params = snd_soc_dai_get_dma_data(dai, substream);
  73         dma_cfg = dma_params->dma_cfg;
  74
  75         mem_data_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
  76
  77         switch (dma_params->data_size) {
  78         case 32:
  79                 per_data_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
  80                 break;
  81         case 16:
  82                 per_data_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
  83                 break;
  84         case 8:
  85                 per_data_width = DMA_SLAVE_BUSWIDTH_1_BYTE;
  86                 break;
  87         default:
  88                 per_data_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
  89         }
  90
  91         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
  92                 dma_cfg->src_info.data_width = mem_data_width;
  93                 dma_cfg->dst_info.data_width = per_data_width;
  94         } else {
  95                 dma_cfg->src_info.data_width = per_data_width;
  96                 dma_cfg->dst_info.data_width = mem_data_width;
  97         }
  98
  99         return snd_dmaengine_pcm_request_channel(stedma40_filter, dma_cfg);
 100 }
 101
 102 static int ux500_pcm_prepare_slave_config(struct snd_pcm_substream *substream,
 103                 struct snd_pcm_hw_params *params,
 104                 struct dma_slave_config *slave_config)
 105 {
 106         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 107         struct msp_i2s_platform_data *pdata = rtd->cpu_dai->dev->platform_data;
 108         struct snd_dmaengine_dai_dma_data *snd_dma_params;
 109         struct ux500_msp_dma_params *ste_dma_params;
 110         dma_addr_t dma_addr;
 111         int ret;
 112
 113         if (pdata) {
 114                 ste_dma_params =
 115                         snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
 116                 dma_addr = ste_dma_params->tx_rx_addr;
 117         } else {
 118                 snd_dma_params =
 119                         snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
 120                 dma_addr = snd_dma_params->addr;
 121         }
 122
 123         ret = snd_hwparams_to_dma_slave_config(substream, params, slave_config);
 124         if (ret)
 125                 return ret;
 126
 127         slave_config->dst_maxburst = 4;
 128         slave_config->src_maxburst = 4;
 129
 130         slave_config->src_addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
 131         slave_config->dst_addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
 132
 133         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 134                 slave_config->dst_addr = dma_addr;
 135         else
 136                 slave_config->src_addr = dma_addr;
 137
 138         return 0;
 139 }
 140
 141 static const struct snd_dmaengine_pcm_config ux500_dmaengine_pcm_config = {
 142         .pcm_hardware = &ux500_pcm_hw,
 143         .compat_request_channel = ux500_pcm_request_chan,
 144         .prealloc_buffer_size = 128 * 1024,
 145         .prepare_slave_config = ux500_pcm_prepare_slave_config,
 146 };
 147
 148 int ux500_pcm_register_platform(struct platform_device *pdev)
 149 {
 150         int ret;
 151
 152         ret = snd_dmaengine_pcm_register(&pdev->dev,
 153                         &ux500_dmaengine_pcm_config,
 154                         SND_DMAENGINE_PCM_FLAG_NO_RESIDUE |
 155                         SND_DMAENGINE_PCM_FLAG_COMPAT |
 156                         SND_DMAENGINE_PCM_FLAG_NO_DT);
 157         if (ret < 0) {
 158                 dev_err(&pdev->dev,
 159                         "%s: ERROR: Failed to register platform '%s' (%d)!\n",
 160                         __func__, pdev->name, ret);
 161                 return ret;
 162         }
 163
 164         return 0;
 165 }
 166 EXPORT_SYMBOL_GPL(ux500_pcm_register_platform);
 167
 168 int ux500_pcm_unregister_platform(struct platform_device *pdev)
 169 {
 170         snd_dmaengine_pcm_unregister(&pdev->dev);
 171         return 0;
 172 }
 173 EXPORT_SYMBOL_GPL(ux500_pcm_unregister_platform);