sound/soc/ep93xx/ep93xx-pcm.c

   1 /*
   2  * linux/sound/arm/ep93xx-pcm.c - EP93xx ALSA PCM interface
   3  *
   4  * Copyright (C) 2006 Lennert Buytenhek <buytenh@wantstofly.org>
   5  * Copyright (C) 2006 Applied Data Systems
   6  *
   7  * Rewritten for the SoC audio subsystem (Based on PXA2xx code):
   8  *   Copyright (c) 2008 Ryan Mallon
   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
  12  * published by the Free Software Foundation.
  13  */
  14
  15 #include <linux/module.h>
  16 #include <linux/init.h>
  17 #include <linux/device.h>
  18 #include <linux/slab.h>
  19 #include <linux/dmaengine.h>
  20 #include <linux/dma-mapping.h>
  21
  22 #include <sound/core.h>
  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 <mach/dma.h>
  29 #include <mach/hardware.h>
  30 #include <mach/ep93xx-regs.h>
  31
  32 #include "ep93xx-pcm.h"
  33
  34 static const struct snd_pcm_hardware ep93xx_pcm_hardware = {
  35         .info                   = (SNDRV_PCM_INFO_MMAP          |
  36                                    SNDRV_PCM_INFO_MMAP_VALID    |
  37                                    SNDRV_PCM_INFO_INTERLEAVED   |
  38                                    SNDRV_PCM_INFO_BLOCK_TRANSFER),
  39
  40         .rates                  = SNDRV_PCM_RATE_8000_192000,
  41         .rate_min               = SNDRV_PCM_RATE_8000,
  42         .rate_max               = SNDRV_PCM_RATE_192000,
  43
  44         .formats                = (SNDRV_PCM_FMTBIT_S16_LE |
  45                                    SNDRV_PCM_FMTBIT_S24_LE |
  46                                    SNDRV_PCM_FMTBIT_S32_LE),
  47
  48         .buffer_bytes_max       = 131072,
  49         .period_bytes_min       = 32,
  50         .period_bytes_max       = 32768,
  51         .periods_min            = 1,
  52         .periods_max            = 32,
  53         .fifo_size              = 32,
  54 };
  55
  56 static bool ep93xx_pcm_dma_filter(struct dma_chan *chan, void *filter_param)
  57 {
  58         struct ep93xx_dma_data *data = filter_param;
  59
  60         if (data->direction == ep93xx_dma_chan_direction(chan)) {
  61                 chan->private = data;
  62                 return true;
  63         }
  64
  65         return false;
  66 }
  67
  68 static int ep93xx_pcm_open(struct snd_pcm_substream *substream)
  69 {
  70         struct snd_soc_pcm_runtime *rtd = substream->private_data;
  71         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
  72         struct ep93xx_pcm_dma_params *dma_params;
  73         struct ep93xx_dma_data *dma_data;
  74         int ret;
  75
  76         snd_soc_set_runtime_hwparams(substream, &ep93xx_pcm_hardware);
  77
  78         dma_data = kmalloc(sizeof(*dma_data), GFP_KERNEL);
  79         if (!dma_data)
  80                 return -ENOMEM;
  81
  82         dma_params = snd_soc_dai_get_dma_data(cpu_dai, substream);
  83         dma_data->port = dma_params->dma_port;
  84         dma_data->name = dma_params->name;
  85         dma_data->direction = snd_pcm_substream_to_dma_direction(substream);
  86
  87         ret = snd_dmaengine_pcm_open(substream, ep93xx_pcm_dma_filter, dma_data);
  88         if (ret) {
  89                 kfree(dma_data);
  90                 return ret;
  91         }
  92
  93         snd_dmaengine_pcm_set_data(substream, dma_data);
  94
  95         return 0;
  96 }
  97
  98 static int ep93xx_pcm_close(struct snd_pcm_substream *substream)
  99 {
 100         struct dma_data *dma_data = snd_dmaengine_pcm_get_data(substream);
 101
 102         snd_dmaengine_pcm_close(substream);
 103         kfree(dma_data);
 104         return 0;
 105 }
 106
 107 static int ep93xx_pcm_hw_params(struct snd_pcm_substream *substream,
 108                                 struct snd_pcm_hw_params *params)
 109 {
 110         snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
 111
 112         return 0;
 113 }
 114
 115 static int ep93xx_pcm_hw_free(struct snd_pcm_substream *substream)
 116 {
 117         snd_pcm_set_runtime_buffer(substream, NULL);
 118         return 0;
 119 }
 120
 121 static int ep93xx_pcm_mmap(struct snd_pcm_substream *substream,
 122                            struct vm_area_struct *vma)
 123 {
 124         struct snd_pcm_runtime *runtime = substream->runtime;
 125
 126         return dma_mmap_writecombine(substream->pcm->card->dev, vma,
 127                                      runtime->dma_area,
 128                                      runtime->dma_addr,
 129                                      runtime->dma_bytes);
 130 }
 131
 132 static struct snd_pcm_ops ep93xx_pcm_ops = {
 133         .open           = ep93xx_pcm_open,
 134         .close          = ep93xx_pcm_close,
 135         .ioctl          = snd_pcm_lib_ioctl,
 136         .hw_params      = ep93xx_pcm_hw_params,
 137         .hw_free        = ep93xx_pcm_hw_free,
 138         .trigger        = snd_dmaengine_pcm_trigger,
 139         .pointer        = snd_dmaengine_pcm_pointer_no_residue,
 140         .mmap           = ep93xx_pcm_mmap,
 141 };
 142
 143 static int ep93xx_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream)
 144 {
 145         struct snd_pcm_substream *substream = pcm->streams[stream].substream;
 146         struct snd_dma_buffer *buf = &substream->dma_buffer;
 147         size_t size = ep93xx_pcm_hardware.buffer_bytes_max;
 148
 149         buf->dev.type = SNDRV_DMA_TYPE_DEV;
 150         buf->dev.dev = pcm->card->dev;
 151         buf->private_data = NULL;
 152         buf->area = dma_alloc_writecombine(pcm->card->dev, size,
 153                                            &buf->addr, GFP_KERNEL);
 154         buf->bytes = size;
 155
 156         return (buf->area == NULL) ? -ENOMEM : 0;
 157 }
 158
 159 static void ep93xx_pcm_free_dma_buffers(struct snd_pcm *pcm)
 160 {
 161         struct snd_pcm_substream *substream;
 162         struct snd_dma_buffer *buf;
 163         int stream;
 164
 165         for (stream = 0; stream < 2; stream++) {
 166                 substream = pcm->streams[stream].substream;
 167                 if (!substream)
 168                         continue;
 169
 170                 buf = &substream->dma_buffer;
 171                 if (!buf->area)
 172                         continue;
 173
 174                 dma_free_writecombine(pcm->card->dev, buf->bytes, buf->area,
 175                                       buf->addr);
 176                 buf->area = NULL;
 177         }
 178 }
 179
 180 static u64 ep93xx_pcm_dmamask = DMA_BIT_MASK(32);
 181
 182 static int ep93xx_pcm_new(struct snd_soc_pcm_runtime *rtd)
 183 {
 184         struct snd_card *card = rtd->card->snd_card;
 185         struct snd_pcm *pcm = rtd->pcm;
 186         int ret = 0;
 187
 188         if (!card->dev->dma_mask)
 189                 card->dev->dma_mask = &ep93xx_pcm_dmamask;
 190         if (!card->dev->coherent_dma_mask)
 191                 card->dev->coherent_dma_mask = DMA_BIT_MASK(32);
 192
 193         if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
 194                 ret = ep93xx_pcm_preallocate_dma_buffer(pcm,
 195                                         SNDRV_PCM_STREAM_PLAYBACK);
 196                 if (ret)
 197                         return ret;
 198         }
 199
 200         if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
 201                 ret = ep93xx_pcm_preallocate_dma_buffer(pcm,
 202                                         SNDRV_PCM_STREAM_CAPTURE);
 203                 if (ret)
 204                         return ret;
 205         }
 206
 207         return 0;
 208 }
 209
 210 static struct snd_soc_platform_driver ep93xx_soc_platform = {
 211         .ops            = &ep93xx_pcm_ops,
 212         .pcm_new        = &ep93xx_pcm_new,
 213         .pcm_free       = &ep93xx_pcm_free_dma_buffers,
 214 };
 215
 216 static int __devinit ep93xx_soc_platform_probe(struct platform_device *pdev)
 217 {
 218         return snd_soc_register_platform(&pdev->dev, &ep93xx_soc_platform);
 219 }
 220
 221 static int __devexit ep93xx_soc_platform_remove(struct platform_device *pdev)
 222 {
 223         snd_soc_unregister_platform(&pdev->dev);
 224         return 0;
 225 }
 226
 227 static struct platform_driver ep93xx_pcm_driver = {
 228         .driver = {
 229                         .name = "ep93xx-pcm-audio",
 230                         .owner = THIS_MODULE,
 231         },
 232
 233         .probe = ep93xx_soc_platform_probe,
 234         .remove = __devexit_p(ep93xx_soc_platform_remove),
 235 };
 236
 237 module_platform_driver(ep93xx_pcm_driver);
 238
 239 MODULE_AUTHOR("Ryan Mallon");
 240 MODULE_DESCRIPTION("EP93xx ALSA PCM interface");
 241 MODULE_LICENSE("GPL");
 242 MODULE_ALIAS("platform:ep93xx-pcm-audio");