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