sound/soc/imx/imx-pcm-dma-mx2.c

   1 /*
   2  * imx-pcm-dma-mx2.c  --  ALSA Soc Audio Layer
   3  *
   4  * Copyright 2009 Sascha Hauer <s.hauer@pengutronix.de>
   5  *
   6  * This code is based on code copyrighted by Freescale,
   7  * Liam Girdwood, Javier Martin and probably others.
   8  *
   9  *  This program is free software; you can redistribute  it and/or modify it
  10  *  under  the terms of  the GNU General  Public License as published by the
  11  *  Free Software Foundation;  either version 2 of the  License, or (at your
  12  *  option) any later version.
  13  */
  14 #include <linux/clk.h>
  15 #include <linux/delay.h>
  16 #include <linux/device.h>
  17 #include <linux/dma-mapping.h>
  18 #include <linux/init.h>
  19 #include <linux/interrupt.h>
  20 #include <linux/module.h>
  21 #include <linux/platform_device.h>
  22 #include <linux/slab.h>
  23 #include <linux/dmaengine.h>
  24
  25 #include <sound/core.h>
  26 #include <sound/initval.h>
  27 #include <sound/pcm.h>
  28 #include <sound/pcm_params.h>
  29 #include <sound/soc.h>
  30
  31 #include <mach/dma.h>
  32
  33 #include "imx-ssi.h"
  34
  35 struct imx_pcm_runtime_data {
  36         int period_bytes;
  37         int periods;
  38         int dma;
  39         unsigned long offset;
  40         unsigned long size;
  41         void *buf;
  42         int period_time;
  43         struct dma_async_tx_descriptor *desc;
  44         struct dma_chan *dma_chan;
  45         struct imx_dma_data dma_data;
  46 };
  47
  48 static void audio_dma_irq(void *data)
  49 {
  50         struct snd_pcm_substream *substream = (struct snd_pcm_substream *)data;
  51         struct snd_pcm_runtime *runtime = substream->runtime;
  52         struct imx_pcm_runtime_data *iprtd = runtime->private_data;
  53
  54         iprtd->offset += iprtd->period_bytes;
  55         iprtd->offset %= iprtd->period_bytes * iprtd->periods;
  56
  57         snd_pcm_period_elapsed(substream);
  58 }
  59
  60 static bool filter(struct dma_chan *chan, void *param)
  61 {
  62         struct imx_pcm_runtime_data *iprtd = param;
  63
  64         if (!imx_dma_is_general_purpose(chan))
  65                 return false;
  66
  67         chan->private = &iprtd->dma_data;
  68
  69         return true;
  70 }
  71
  72 static int imx_ssi_dma_alloc(struct snd_pcm_substream *substream,
  73                                 struct snd_pcm_hw_params *params)
  74 {
  75         struct snd_soc_pcm_runtime *rtd = substream->private_data;
  76         struct imx_pcm_dma_params *dma_params;
  77         struct snd_pcm_runtime *runtime = substream->runtime;
  78         struct imx_pcm_runtime_data *iprtd = runtime->private_data;
  79         struct dma_slave_config slave_config;
  80         dma_cap_mask_t mask;
  81         enum dma_slave_buswidth buswidth;
  82         int ret;
  83
  84         dma_params = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
  85
  86         iprtd->dma_data.peripheral_type = IMX_DMATYPE_SSI;
  87         iprtd->dma_data.priority = DMA_PRIO_HIGH;
  88         iprtd->dma_data.dma_request = dma_params->dma;
  89
  90         /* Try to grab a DMA channel */
  91         dma_cap_zero(mask);
  92         dma_cap_set(DMA_SLAVE, mask);
  93         iprtd->dma_chan = dma_request_channel(mask, filter, iprtd);
  94         if (!iprtd->dma_chan)
  95                 return -EINVAL;
  96
  97         switch (params_format(params)) {
  98         case SNDRV_PCM_FORMAT_S16_LE:
  99                 buswidth = DMA_SLAVE_BUSWIDTH_2_BYTES;
 100                 break;
 101         case SNDRV_PCM_FORMAT_S20_3LE:
 102         case SNDRV_PCM_FORMAT_S24_LE:
 103                 buswidth = DMA_SLAVE_BUSWIDTH_4_BYTES;
 104                 break;
 105         default:
 106                 return 0;
 107         }
 108
 109         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 110                 slave_config.direction = DMA_TO_DEVICE;
 111                 slave_config.dst_addr = dma_params->dma_addr;
 112                 slave_config.dst_addr_width = buswidth;
 113                 slave_config.dst_maxburst = dma_params->burstsize;
 114         } else {
 115                 slave_config.direction = DMA_FROM_DEVICE;
 116                 slave_config.src_addr = dma_params->dma_addr;
 117                 slave_config.src_addr_width = buswidth;
 118                 slave_config.src_maxburst = dma_params->burstsize;
 119         }
 120
 121         ret = dmaengine_slave_config(iprtd->dma_chan, &slave_config);
 122         if (ret)
 123                 return ret;
 124
 125         return 0;
 126 }
 127
 128 static int snd_imx_pcm_hw_params(struct snd_pcm_substream *substream,
 129                                 struct snd_pcm_hw_params *params)
 130 {
 131         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 132         struct snd_pcm_runtime *runtime = substream->runtime;
 133         struct imx_pcm_runtime_data *iprtd = runtime->private_data;
 134         unsigned long dma_addr;
 135         struct dma_chan *chan;
 136         struct imx_pcm_dma_params *dma_params;
 137         int ret;
 138
 139         dma_params = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
 140         ret = imx_ssi_dma_alloc(substream, params);
 141         if (ret)
 142                 return ret;
 143         chan = iprtd->dma_chan;
 144
 145         iprtd->size = params_buffer_bytes(params);
 146         iprtd->periods = params_periods(params);
 147         iprtd->period_bytes = params_period_bytes(params);
 148         iprtd->offset = 0;
 149         iprtd->period_time = HZ / (params_rate(params) /
 150                         params_period_size(params));
 151
 152         snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
 153
 154         dma_addr = runtime->dma_addr;
 155
 156         iprtd->buf = (unsigned int *)substream->dma_buffer.area;
 157
 158         iprtd->desc = chan->device->device_prep_dma_cyclic(chan, dma_addr,
 159                         iprtd->period_bytes * iprtd->periods,
 160                         iprtd->period_bytes,
 161                         substream->stream == SNDRV_PCM_STREAM_PLAYBACK ?
 162                         DMA_TO_DEVICE : DMA_FROM_DEVICE);
 163         if (!iprtd->desc) {
 164                 dev_err(&chan->dev->device, "cannot prepare slave dma\n");
 165                 return -EINVAL;
 166         }
 167
 168         iprtd->desc->callback = audio_dma_irq;
 169         iprtd->desc->callback_param = substream;
 170
 171         return 0;
 172 }
 173
 174 static int snd_imx_pcm_hw_free(struct snd_pcm_substream *substream)
 175 {
 176         struct snd_pcm_runtime *runtime = substream->runtime;
 177         struct imx_pcm_runtime_data *iprtd = runtime->private_data;
 178
 179         if (iprtd->dma_chan) {
 180                 dma_release_channel(iprtd->dma_chan);
 181                 iprtd->dma_chan = NULL;
 182         }
 183
 184         return 0;
 185 }
 186
 187 static int snd_imx_pcm_prepare(struct snd_pcm_substream *substream)
 188 {
 189         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 190         struct imx_pcm_dma_params *dma_params;
 191
 192         dma_params = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
 193
 194         return 0;
 195 }
 196
 197 static int snd_imx_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
 198 {
 199         struct snd_pcm_runtime *runtime = substream->runtime;
 200         struct imx_pcm_runtime_data *iprtd = runtime->private_data;
 201
 202         switch (cmd) {
 203         case SNDRV_PCM_TRIGGER_START:
 204         case SNDRV_PCM_TRIGGER_RESUME:
 205         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 206                 dmaengine_submit(iprtd->desc);
 207
 208                 break;
 209
 210         case SNDRV_PCM_TRIGGER_STOP:
 211         case SNDRV_PCM_TRIGGER_SUSPEND:
 212         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 213                 dmaengine_terminate_all(iprtd->dma_chan);
 214
 215                 break;
 216         default:
 217                 return -EINVAL;
 218         }
 219
 220         return 0;
 221 }
 222
 223 static snd_pcm_uframes_t snd_imx_pcm_pointer(struct snd_pcm_substream *substream)
 224 {
 225         struct snd_pcm_runtime *runtime = substream->runtime;
 226         struct imx_pcm_runtime_data *iprtd = runtime->private_data;
 227
 228         pr_debug("%s: %ld %ld\n", __func__, iprtd->offset,
 229                         bytes_to_frames(substream->runtime, iprtd->offset));
 230
 231         return bytes_to_frames(substream->runtime, iprtd->offset);
 232 }
 233
 234 static struct snd_pcm_hardware snd_imx_hardware = {
 235         .info = SNDRV_PCM_INFO_INTERLEAVED |
 236                 SNDRV_PCM_INFO_BLOCK_TRANSFER |
 237                 SNDRV_PCM_INFO_MMAP |
 238                 SNDRV_PCM_INFO_MMAP_VALID |
 239                 SNDRV_PCM_INFO_PAUSE |
 240                 SNDRV_PCM_INFO_RESUME,
 241         .formats = SNDRV_PCM_FMTBIT_S16_LE,
 242         .rate_min = 8000,
 243         .channels_min = 2,
 244         .channels_max = 2,
 245         .buffer_bytes_max = IMX_SSI_DMABUF_SIZE,
 246         .period_bytes_min = 128,
 247         .period_bytes_max = 65535, /* Limited by SDMA engine */
 248         .periods_min = 2,
 249         .periods_max = 255,
 250         .fifo_size = 0,
 251 };
 252
 253 static int snd_imx_open(struct snd_pcm_substream *substream)
 254 {
 255         struct snd_pcm_runtime *runtime = substream->runtime;
 256         struct imx_pcm_runtime_data *iprtd;
 257         int ret;
 258
 259         iprtd = kzalloc(sizeof(*iprtd), GFP_KERNEL);
 260         if (iprtd == NULL)
 261                 return -ENOMEM;
 262         runtime->private_data = iprtd;
 263
 264         ret = snd_pcm_hw_constraint_integer(substream->runtime,
 265                         SNDRV_PCM_HW_PARAM_PERIODS);
 266         if (ret < 0) {
 267                 kfree(iprtd);
 268                 return ret;
 269         }
 270
 271         snd_soc_set_runtime_hwparams(substream, &snd_imx_hardware);
 272
 273         return 0;
 274 }
 275
 276 static int snd_imx_close(struct snd_pcm_substream *substream)
 277 {
 278         struct snd_pcm_runtime *runtime = substream->runtime;
 279         struct imx_pcm_runtime_data *iprtd = runtime->private_data;
 280
 281         kfree(iprtd);
 282
 283         return 0;
 284 }
 285
 286 static struct snd_pcm_ops imx_pcm_ops = {
 287         .open           = snd_imx_open,
 288         .close          = snd_imx_close,
 289         .ioctl          = snd_pcm_lib_ioctl,
 290         .hw_params      = snd_imx_pcm_hw_params,
 291         .hw_free        = snd_imx_pcm_hw_free,
 292         .prepare        = snd_imx_pcm_prepare,
 293         .trigger        = snd_imx_pcm_trigger,
 294         .pointer        = snd_imx_pcm_pointer,
 295         .mmap           = snd_imx_pcm_mmap,
 296 };
 297
 298 static struct snd_soc_platform_driver imx_soc_platform_mx2 = {
 299         .ops            = &imx_pcm_ops,
 300         .pcm_new        = imx_pcm_new,
 301         .pcm_free       = imx_pcm_free,
 302 };
 303
 304 static int __devinit imx_soc_platform_probe(struct platform_device *pdev)
 305 {
 306         struct imx_ssi *ssi = platform_get_drvdata(pdev);
 307
 308         ssi->dma_params_tx.burstsize = 6;
 309         ssi->dma_params_rx.burstsize = 4;
 310
 311         return snd_soc_register_platform(&pdev->dev, &imx_soc_platform_mx2);
 312 }
 313
 314 static int __devexit imx_soc_platform_remove(struct platform_device *pdev)
 315 {
 316         snd_soc_unregister_platform(&pdev->dev);
 317         return 0;
 318 }
 319
 320 static struct platform_driver imx_pcm_driver = {
 321         .driver = {
 322                         .name = "imx-pcm-audio",
 323                         .owner = THIS_MODULE,
 324         },
 325         .probe = imx_soc_platform_probe,
 326         .remove = __devexit_p(imx_soc_platform_remove),
 327 };
 328
 329 static int __init snd_imx_pcm_init(void)
 330 {
 331         return platform_driver_register(&imx_pcm_driver);
 332 }
 333 module_init(snd_imx_pcm_init);
 334
 335 static void __exit snd_imx_pcm_exit(void)
 336 {
 337         platform_driver_unregister(&imx_pcm_driver);
 338 }
 339 module_exit(snd_imx_pcm_exit);
 340 MODULE_LICENSE("GPL");
 341 MODULE_ALIAS("platform:imx-pcm-audio");