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
  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
  17 #include <sound/pcm.h>
  18 #include <sound/pcm_params.h>
  19 #include <sound/soc.h>
  20 #include <sound/dmaengine_pcm.h>
  21
  22 #include "ux500_msp_i2s.h"
  23 #include "ux500_pcm.h"
  24
  25 #define UX500_PLATFORM_PERIODS_BYTES_MIN        128
  26 #define UX500_PLATFORM_PERIODS_BYTES_MAX        (64 * PAGE_SIZE)
  27 #define UX500_PLATFORM_PERIODS_MIN              2
  28 #define UX500_PLATFORM_PERIODS_MAX              48
  29 #define UX500_PLATFORM_BUFFER_BYTES_MAX         (2048 * PAGE_SIZE)
  30
  31 static int ux500_pcm_prepare_slave_config(struct snd_pcm_substream *substream,
  32                 struct snd_pcm_hw_params *params,
  33                 struct dma_slave_config *slave_config)
  34 {
  35         struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream);
  36         struct snd_dmaengine_dai_dma_data *snd_dma_params;
  37         dma_addr_t dma_addr;
  38         int ret;
  39
  40         snd_dma_params = snd_soc_dai_get_dma_data(snd_soc_rtd_to_cpu(rtd, 0), substream);
  41         dma_addr = snd_dma_params->addr;
  42
  43         ret = snd_hwparams_to_dma_slave_config(substream, params, slave_config);
  44         if (ret)
  45                 return ret;
  46
  47         slave_config->dst_maxburst = 4;
  48         slave_config->src_maxburst = 4;
  49
  50         slave_config->src_addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
  51         slave_config->dst_addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
  52
  53         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
  54                 slave_config->dst_addr = dma_addr;
  55         else
  56                 slave_config->src_addr = dma_addr;
  57
  58         return 0;
  59 }
  60
  61 static const struct snd_dmaengine_pcm_config ux500_dmaengine_of_pcm_config = {
  62         .prepare_slave_config = ux500_pcm_prepare_slave_config,
  63 };
  64
  65 int ux500_pcm_register_platform(struct platform_device *pdev)
  66 {
  67         int ret;
  68
  69         ret = snd_dmaengine_pcm_register(&pdev->dev,
  70                                          &ux500_dmaengine_of_pcm_config, 0);
  71         if (ret < 0) {
  72                 dev_err(&pdev->dev,
  73                         "%s: ERROR: Failed to register platform '%s' (%d)!\n",
  74                         __func__, pdev->name, ret);
  75                 return ret;
  76         }
  77
  78         return 0;
  79 }
  80 EXPORT_SYMBOL_GPL(ux500_pcm_register_platform);
  81
  82 int ux500_pcm_unregister_platform(struct platform_device *pdev)
  83 {
  84         snd_dmaengine_pcm_unregister(&pdev->dev);
  85         return 0;
  86 }
  87 EXPORT_SYMBOL_GPL(ux500_pcm_unregister_platform);
  88
  89 MODULE_AUTHOR("Ola Lilja");
  90 MODULE_AUTHOR("Roger Nilsson");
  91 MODULE_DESCRIPTION("ASoC UX500 driver");
  92 MODULE_LICENSE("GPL v2");