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