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         struct device *dev = dai->dev;
  69         u16 per_data_width, mem_data_width;
  70         struct stedma40_chan_cfg *dma_cfg;
  71         struct ux500_msp_dma_params *dma_params;
  72
  73         dev_dbg(dev, "%s: MSP %d (%s): Enter.\n", __func__, dai->id,
  74                 snd_pcm_stream_str(substream));
  75
  76         dma_params = snd_soc_dai_get_dma_data(dai, substream);
  77         dma_cfg = dma_params->dma_cfg;
  78
  79         mem_data_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
  80
  81         switch (dma_params->data_size) {
  82         case 32:
  83                 per_data_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
  84                 break;
  85         case 16:
  86                 per_data_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
  87                 break;
  88         case 8:
  89                 per_data_width = DMA_SLAVE_BUSWIDTH_1_BYTE;
  90                 break;
  91         default:
  92                 per_data_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
  93         }
  94
  95         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
  96                 dma_cfg->src_info.data_width = mem_data_width;
  97                 dma_cfg->dst_info.data_width = per_data_width;
  98         } else {
  99                 dma_cfg->src_info.data_width = per_data_width;
 100                 dma_cfg->dst_info.data_width = mem_data_width;
 101         }
 102
 103         return snd_dmaengine_pcm_request_channel(stedma40_filter, dma_cfg);
 104 }
 105
 106 static int ux500_pcm_prepare_slave_config(struct snd_pcm_substream *substream,
 107                 struct snd_pcm_hw_params *params,
 108                 struct dma_slave_config *slave_config)
 109 {
 110         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 111         struct ux500_msp_dma_params *dma_params;
 112         struct stedma40_chan_cfg *dma_cfg;
 113         int ret;
 114
 115         dma_params = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
 116         dma_cfg = dma_params->dma_cfg;
 117
 118         ret = snd_hwparams_to_dma_slave_config(substream, params, slave_config);
 119         if (ret)
 120                 return ret;
 121
 122         slave_config->dst_maxburst = 4;
 123         slave_config->dst_addr_width = dma_cfg->dst_info.data_width;
 124         slave_config->src_maxburst = 4;
 125         slave_config->src_addr_width = dma_cfg->src_info.data_width;
 126
 127         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 128                 slave_config->dst_addr = dma_params->tx_rx_addr;
 129         else
 130                 slave_config->src_addr = dma_params->tx_rx_addr;
 131
 132         return 0;
 133 }
 134
 135 static const struct snd_dmaengine_pcm_config ux500_dmaengine_pcm_config = {
 136         .pcm_hardware = &ux500_pcm_hw,
 137         .compat_request_channel = ux500_pcm_request_chan,
 138         .prealloc_buffer_size = 128 * 1024,
 139         .prepare_slave_config = ux500_pcm_prepare_slave_config,
 140 };
 141
 142 int ux500_pcm_register_platform(struct platform_device *pdev)
 143 {
 144         int ret;
 145
 146         ret = snd_dmaengine_pcm_register(&pdev->dev,
 147                         &ux500_dmaengine_pcm_config,
 148                         SND_DMAENGINE_PCM_FLAG_NO_RESIDUE |
 149                         SND_DMAENGINE_PCM_FLAG_COMPAT |
 150                         SND_DMAENGINE_PCM_FLAG_NO_DT);
 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);