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Linux/sound/arm/pxa2xx-pcm-lib.c

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  1 /*
  2  * This program is free software; you can redistribute it and/or modify
  3  * it under the terms of the GNU General Public License version 2 as
  4  * published by the Free Software Foundation.
  5  */
  6 
  7 #include <linux/slab.h>
  8 #include <linux/module.h>
  9 #include <linux/dma-mapping.h>
 10 #include <linux/dmaengine.h>
 11 #include <linux/dma/pxa-dma.h>
 12 
 13 #include <sound/core.h>
 14 #include <sound/pcm.h>
 15 #include <sound/pcm_params.h>
 16 #include <sound/pxa2xx-lib.h>
 17 #include <sound/dmaengine_pcm.h>
 18 
 19 #include "pxa2xx-pcm.h"
 20 
 21 static const struct snd_pcm_hardware pxa2xx_pcm_hardware = {
 22         .info                   = SNDRV_PCM_INFO_MMAP |
 23                                   SNDRV_PCM_INFO_MMAP_VALID |
 24                                   SNDRV_PCM_INFO_INTERLEAVED |
 25                                   SNDRV_PCM_INFO_PAUSE |
 26                                   SNDRV_PCM_INFO_RESUME,
 27         .formats                = SNDRV_PCM_FMTBIT_S16_LE |
 28                                         SNDRV_PCM_FMTBIT_S24_LE |
 29                                         SNDRV_PCM_FMTBIT_S32_LE,
 30         .period_bytes_min       = 32,
 31         .period_bytes_max       = 8192 - 32,
 32         .periods_min            = 1,
 33         .periods_max            = 256,
 34         .buffer_bytes_max       = 128 * 1024,
 35         .fifo_size              = 32,
 36 };
 37 
 38 int __pxa2xx_pcm_hw_params(struct snd_pcm_substream *substream,
 39                                 struct snd_pcm_hw_params *params)
 40 {
 41         struct dma_chan *chan = snd_dmaengine_pcm_get_chan(substream);
 42         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 43         struct snd_dmaengine_dai_dma_data *dma_params;
 44         struct dma_slave_config config;
 45         int ret;
 46 
 47         dma_params = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
 48         if (!dma_params)
 49                 return 0;
 50 
 51         ret = snd_hwparams_to_dma_slave_config(substream, params, &config);
 52         if (ret)
 53                 return ret;
 54 
 55         snd_dmaengine_pcm_set_config_from_dai_data(substream,
 56                         snd_soc_dai_get_dma_data(rtd->cpu_dai, substream),
 57                         &config);
 58 
 59         ret = dmaengine_slave_config(chan, &config);
 60         if (ret)
 61                 return ret;
 62 
 63         snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
 64 
 65         return 0;
 66 }
 67 EXPORT_SYMBOL(__pxa2xx_pcm_hw_params);
 68 
 69 int __pxa2xx_pcm_hw_free(struct snd_pcm_substream *substream)
 70 {
 71         snd_pcm_set_runtime_buffer(substream, NULL);
 72         return 0;
 73 }
 74 EXPORT_SYMBOL(__pxa2xx_pcm_hw_free);
 75 
 76 int pxa2xx_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
 77 {
 78         return snd_dmaengine_pcm_trigger(substream, cmd);
 79 }
 80 EXPORT_SYMBOL(pxa2xx_pcm_trigger);
 81 
 82 snd_pcm_uframes_t
 83 pxa2xx_pcm_pointer(struct snd_pcm_substream *substream)
 84 {
 85         return snd_dmaengine_pcm_pointer(substream);
 86 }
 87 EXPORT_SYMBOL(pxa2xx_pcm_pointer);
 88 
 89 int __pxa2xx_pcm_prepare(struct snd_pcm_substream *substream)
 90 {
 91         return 0;
 92 }
 93 EXPORT_SYMBOL(__pxa2xx_pcm_prepare);
 94 
 95 int __pxa2xx_pcm_open(struct snd_pcm_substream *substream)
 96 {
 97         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 98         struct snd_pcm_runtime *runtime = substream->runtime;
 99         struct snd_dmaengine_dai_dma_data *dma_params;
100         int ret;
101 
102         runtime->hw = pxa2xx_pcm_hardware;
103 
104         dma_params = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
105         if (!dma_params)
106                 return 0;
107 
108         /*
109          * For mysterious reasons (and despite what the manual says)
110          * playback samples are lost if the DMA count is not a multiple
111          * of the DMA burst size.  Let's add a rule to enforce that.
112          */
113         ret = snd_pcm_hw_constraint_step(runtime, 0,
114                 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 32);
115         if (ret)
116                 return ret;
117 
118         ret = snd_pcm_hw_constraint_step(runtime, 0,
119                 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 32);
120         if (ret)
121                 return ret;
122 
123         ret = snd_pcm_hw_constraint_integer(runtime,
124                                             SNDRV_PCM_HW_PARAM_PERIODS);
125         if (ret < 0)
126                 return ret;
127 
128         return snd_dmaengine_pcm_open_request_chan(substream,
129                                         pxad_filter_fn,
130                                         dma_params->filter_data);
131 }
132 EXPORT_SYMBOL(__pxa2xx_pcm_open);
133 
134 int __pxa2xx_pcm_close(struct snd_pcm_substream *substream)
135 {
136         return snd_dmaengine_pcm_close_release_chan(substream);
137 }
138 EXPORT_SYMBOL(__pxa2xx_pcm_close);
139 
140 int pxa2xx_pcm_mmap(struct snd_pcm_substream *substream,
141         struct vm_area_struct *vma)
142 {
143         struct snd_pcm_runtime *runtime = substream->runtime;
144         return dma_mmap_wc(substream->pcm->card->dev, vma, runtime->dma_area,
145                            runtime->dma_addr, runtime->dma_bytes);
146 }
147 EXPORT_SYMBOL(pxa2xx_pcm_mmap);
148 
149 int pxa2xx_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream)
150 {
151         struct snd_pcm_substream *substream = pcm->streams[stream].substream;
152         struct snd_dma_buffer *buf = &substream->dma_buffer;
153         size_t size = pxa2xx_pcm_hardware.buffer_bytes_max;
154         buf->dev.type = SNDRV_DMA_TYPE_DEV;
155         buf->dev.dev = pcm->card->dev;
156         buf->private_data = NULL;
157         buf->area = dma_alloc_wc(pcm->card->dev, size, &buf->addr, GFP_KERNEL);
158         if (!buf->area)
159                 return -ENOMEM;
160         buf->bytes = size;
161         return 0;
162 }
163 EXPORT_SYMBOL(pxa2xx_pcm_preallocate_dma_buffer);
164 
165 void pxa2xx_pcm_free_dma_buffers(struct snd_pcm *pcm)
166 {
167         struct snd_pcm_substream *substream;
168         struct snd_dma_buffer *buf;
169         int stream;
170 
171         for (stream = 0; stream < 2; stream++) {
172                 substream = pcm->streams[stream].substream;
173                 if (!substream)
174                         continue;
175                 buf = &substream->dma_buffer;
176                 if (!buf->area)
177                         continue;
178                 dma_free_wc(pcm->card->dev, buf->bytes, buf->area, buf->addr);
179                 buf->area = NULL;
180         }
181 }
182 EXPORT_SYMBOL(pxa2xx_pcm_free_dma_buffers);
183 
184 MODULE_AUTHOR("Nicolas Pitre");
185 MODULE_DESCRIPTION("Intel PXA2xx sound library");
186 MODULE_LICENSE("GPL");
187 

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