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Linux/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_PERIODS_BYTES_MIN        128
 32 #define UX500_PLATFORM_PERIODS_BYTES_MAX        (64 * PAGE_SIZE)
 33 #define UX500_PLATFORM_PERIODS_MIN              2
 34 #define UX500_PLATFORM_PERIODS_MAX              48
 35 #define UX500_PLATFORM_BUFFER_BYTES_MAX         (2048 * PAGE_SIZE)
 36 
 37 static const struct snd_pcm_hardware ux500_pcm_hw = {
 38         .info = SNDRV_PCM_INFO_INTERLEAVED |
 39                 SNDRV_PCM_INFO_MMAP |
 40                 SNDRV_PCM_INFO_RESUME |
 41                 SNDRV_PCM_INFO_PAUSE,
 42         .buffer_bytes_max = UX500_PLATFORM_BUFFER_BYTES_MAX,
 43         .period_bytes_min = UX500_PLATFORM_PERIODS_BYTES_MIN,
 44         .period_bytes_max = UX500_PLATFORM_PERIODS_BYTES_MAX,
 45         .periods_min = UX500_PLATFORM_PERIODS_MIN,
 46         .periods_max = UX500_PLATFORM_PERIODS_MAX,
 47 };
 48 
 49 static struct dma_chan *ux500_pcm_request_chan(struct snd_soc_pcm_runtime *rtd,
 50         struct snd_pcm_substream *substream)
 51 {
 52         struct snd_soc_dai *dai = rtd->cpu_dai;
 53         u16 per_data_width, mem_data_width;
 54         struct stedma40_chan_cfg *dma_cfg;
 55         struct ux500_msp_dma_params *dma_params;
 56 
 57         dma_params = snd_soc_dai_get_dma_data(dai, substream);
 58         dma_cfg = dma_params->dma_cfg;
 59 
 60         mem_data_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
 61 
 62         switch (dma_params->data_size) {
 63         case 32:
 64                 per_data_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
 65                 break;
 66         case 16:
 67                 per_data_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
 68                 break;
 69         case 8:
 70                 per_data_width = DMA_SLAVE_BUSWIDTH_1_BYTE;
 71                 break;
 72         default:
 73                 per_data_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
 74         }
 75 
 76         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 77                 dma_cfg->src_info.data_width = mem_data_width;
 78                 dma_cfg->dst_info.data_width = per_data_width;
 79         } else {
 80                 dma_cfg->src_info.data_width = per_data_width;
 81                 dma_cfg->dst_info.data_width = mem_data_width;
 82         }
 83 
 84         return snd_dmaengine_pcm_request_channel(stedma40_filter, dma_cfg);
 85 }
 86 
 87 static int ux500_pcm_prepare_slave_config(struct snd_pcm_substream *substream,
 88                 struct snd_pcm_hw_params *params,
 89                 struct dma_slave_config *slave_config)
 90 {
 91         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 92         struct msp_i2s_platform_data *pdata = rtd->cpu_dai->dev->platform_data;
 93         struct snd_dmaengine_dai_dma_data *snd_dma_params;
 94         struct ux500_msp_dma_params *ste_dma_params;
 95         dma_addr_t dma_addr;
 96         int ret;
 97 
 98         if (pdata) {
 99                 ste_dma_params =
100                         snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
101                 dma_addr = ste_dma_params->tx_rx_addr;
102         } else {
103                 snd_dma_params =
104                         snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
105                 dma_addr = snd_dma_params->addr;
106         }
107 
108         ret = snd_hwparams_to_dma_slave_config(substream, params, slave_config);
109         if (ret)
110                 return ret;
111 
112         slave_config->dst_maxburst = 4;
113         slave_config->src_maxburst = 4;
114 
115         slave_config->src_addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
116         slave_config->dst_addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
117 
118         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
119                 slave_config->dst_addr = dma_addr;
120         else
121                 slave_config->src_addr = dma_addr;
122 
123         return 0;
124 }
125 
126 static const struct snd_dmaengine_pcm_config ux500_dmaengine_pcm_config = {
127         .pcm_hardware = &ux500_pcm_hw,
128         .compat_request_channel = ux500_pcm_request_chan,
129         .prealloc_buffer_size = 128 * 1024,
130         .prepare_slave_config = ux500_pcm_prepare_slave_config,
131 };
132 
133 static const struct snd_dmaengine_pcm_config ux500_dmaengine_of_pcm_config = {
134         .compat_request_channel = ux500_pcm_request_chan,
135         .prepare_slave_config = ux500_pcm_prepare_slave_config,
136 };
137 
138 int ux500_pcm_register_platform(struct platform_device *pdev)
139 {
140         const struct snd_dmaengine_pcm_config *pcm_config;
141         struct device_node *np = pdev->dev.of_node;
142         int ret;
143 
144         if (np)
145                 pcm_config = &ux500_dmaengine_of_pcm_config;
146         else
147                 pcm_config = &ux500_dmaengine_pcm_config;
148 
149         ret = snd_dmaengine_pcm_register(&pdev->dev, pcm_config,
150                                          SND_DMAENGINE_PCM_FLAG_NO_RESIDUE |
151                                          SND_DMAENGINE_PCM_FLAG_COMPAT);
152         if (ret < 0) {
153                 dev_err(&pdev->dev,
154                         "%s: ERROR: Failed to register platform '%s' (%d)!\n",
155                         __func__, pdev->name, ret);
156                 return ret;
157         }
158 
159         return 0;
160 }
161 EXPORT_SYMBOL_GPL(ux500_pcm_register_platform);
162 
163 int ux500_pcm_unregister_platform(struct platform_device *pdev)
164 {
165         snd_dmaengine_pcm_unregister(&pdev->dev);
166         return 0;
167 }
168 EXPORT_SYMBOL_GPL(ux500_pcm_unregister_platform);
169 

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