sound/soc/ux500/ux500_pcm.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (C) ST-Ericsson SA 2012
   4  *
   5  * Author: Ola Lilja <ola.o.lilja@stericsson.com>,
   6  *         Roger Nilsson <roger.xr.nilsson@stericsson.com>
   7  *         for ST-Ericsson.
   8  *
   9  * License terms:
  10  */
  11
  12 #include <asm/page.h>
  13
  14 #include <linux/module.h>
  15 #include <linux/dma-mapping.h>
  16 #include <linux/dmaengine.h>
  17 #include <linux/slab.h>
  18 #include <linux/platform_data/dma-ste-dma40.h>
  19
  20 #include <sound/pcm.h>
  21 #include <sound/pcm_params.h>
  22 #include <sound/soc.h>
  23 #include <sound/dmaengine_pcm.h>
  24
  25 #include "ux500_msp_i2s.h"
  26 #include "ux500_pcm.h"
  27
  28 #define UX500_PLATFORM_PERIODS_BYTES_MIN        128
  29 #define UX500_PLATFORM_PERIODS_BYTES_MAX        (64 * PAGE_SIZE)
  30 #define UX500_PLATFORM_PERIODS_MIN              2
  31 #define UX500_PLATFORM_PERIODS_MAX              48
  32 #define UX500_PLATFORM_BUFFER_BYTES_MAX         (2048 * PAGE_SIZE)
  33
  34 static const struct snd_pcm_hardware ux500_pcm_hw = {
  35         .info = SNDRV_PCM_INFO_INTERLEAVED |
  36                 SNDRV_PCM_INFO_MMAP |
  37                 SNDRV_PCM_INFO_RESUME |
  38                 SNDRV_PCM_INFO_PAUSE,
  39         .buffer_bytes_max = UX500_PLATFORM_BUFFER_BYTES_MAX,
  40         .period_bytes_min = UX500_PLATFORM_PERIODS_BYTES_MIN,
  41         .period_bytes_max = UX500_PLATFORM_PERIODS_BYTES_MAX,
  42         .periods_min = UX500_PLATFORM_PERIODS_MIN,
  43         .periods_max = UX500_PLATFORM_PERIODS_MAX,
  44 };
  45
  46 static struct dma_chan *ux500_pcm_request_chan(struct snd_soc_pcm_runtime *rtd,
  47         struct snd_pcm_substream *substream)
  48 {
  49         struct snd_soc_dai *dai = rtd->cpu_dai;
  50         u16 per_data_width, mem_data_width;
  51         struct stedma40_chan_cfg *dma_cfg;
  52         struct ux500_msp_dma_params *dma_params;
  53
  54         dma_params = snd_soc_dai_get_dma_data(dai, substream);
  55         dma_cfg = dma_params->dma_cfg;
  56
  57         mem_data_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
  58
  59         switch (dma_params->data_size) {
  60         case 32:
  61                 per_data_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
  62                 break;
  63         case 16:
  64                 per_data_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
  65                 break;
  66         case 8:
  67                 per_data_width = DMA_SLAVE_BUSWIDTH_1_BYTE;
  68                 break;
  69         default:
  70                 per_data_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
  71         }
  72
  73         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
  74                 dma_cfg->src_info.data_width = mem_data_width;
  75                 dma_cfg->dst_info.data_width = per_data_width;
  76         } else {
  77                 dma_cfg->src_info.data_width = per_data_width;
  78                 dma_cfg->dst_info.data_width = mem_data_width;
  79         }
  80
  81         return snd_dmaengine_pcm_request_channel(stedma40_filter, dma_cfg);
  82 }
  83
  84 static int ux500_pcm_prepare_slave_config(struct snd_pcm_substream *substream,
  85                 struct snd_pcm_hw_params *params,
  86                 struct dma_slave_config *slave_config)
  87 {
  88         struct snd_soc_pcm_runtime *rtd = substream->private_data;
  89         struct msp_i2s_platform_data *pdata = rtd->cpu_dai->dev->platform_data;
  90         struct snd_dmaengine_dai_dma_data *snd_dma_params;
  91         struct ux500_msp_dma_params *ste_dma_params;
  92         dma_addr_t dma_addr;
  93         int ret;
  94
  95         if (pdata) {
  96                 ste_dma_params =
  97                         snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
  98                 dma_addr = ste_dma_params->tx_rx_addr;
  99         } else {
 100                 snd_dma_params =
 101                         snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
 102                 dma_addr = snd_dma_params->addr;
 103         }
 104
 105         ret = snd_hwparams_to_dma_slave_config(substream, params, slave_config);
 106         if (ret)
 107                 return ret;
 108
 109         slave_config->dst_maxburst = 4;
 110         slave_config->src_maxburst = 4;
 111
 112         slave_config->src_addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
 113         slave_config->dst_addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
 114
 115         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 116                 slave_config->dst_addr = dma_addr;
 117         else
 118                 slave_config->src_addr = dma_addr;
 119
 120         return 0;
 121 }
 122
 123 static const struct snd_dmaengine_pcm_config ux500_dmaengine_pcm_config = {
 124         .pcm_hardware = &ux500_pcm_hw,
 125         .compat_request_channel = ux500_pcm_request_chan,
 126         .prealloc_buffer_size = 128 * 1024,
 127         .prepare_slave_config = ux500_pcm_prepare_slave_config,
 128 };
 129
 130 static const struct snd_dmaengine_pcm_config ux500_dmaengine_of_pcm_config = {
 131         .compat_request_channel = ux500_pcm_request_chan,
 132         .prepare_slave_config = ux500_pcm_prepare_slave_config,
 133 };
 134
 135 int ux500_pcm_register_platform(struct platform_device *pdev)
 136 {
 137         const struct snd_dmaengine_pcm_config *pcm_config;
 138         struct device_node *np = pdev->dev.of_node;
 139         int ret;
 140
 141         if (np)
 142                 pcm_config = &ux500_dmaengine_of_pcm_config;
 143         else
 144                 pcm_config = &ux500_dmaengine_pcm_config;
 145
 146         ret = snd_dmaengine_pcm_register(&pdev->dev, pcm_config,
 147                                          SND_DMAENGINE_PCM_FLAG_COMPAT);
 148         if (ret < 0) {
 149                 dev_err(&pdev->dev,
 150                         "%s: ERROR: Failed to register platform '%s' (%d)!\n",
 151                         __func__, pdev->name, ret);
 152                 return ret;
 153         }
 154
 155         return 0;
 156 }
 157 EXPORT_SYMBOL_GPL(ux500_pcm_register_platform);
 158
 159 int ux500_pcm_unregister_platform(struct platform_device *pdev)
 160 {
 161         snd_dmaengine_pcm_unregister(&pdev->dev);
 162         return 0;
 163 }
 164 EXPORT_SYMBOL_GPL(ux500_pcm_unregister_platform);
 165
 166 MODULE_AUTHOR("Ola Lilja");
 167 MODULE_AUTHOR("Roger Nilsson");
 168 MODULE_DESCRIPTION("ASoC UX500 driver");
 169 MODULE_LICENSE("GPL v2");