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ep93xx-pcm.c

/*
 * linux/sound/arm/ep93xx-pcm.c - EP93xx ALSA PCM interface
 *
 * Copyright (C) 2006 Lennert Buytenhek <buytenh@wantstofly.org>
 * Copyright (C) 2006 Applied Data Systems
 *
 * Rewritten for the SoC audio subsystem (Based on PXA2xx code):
 *   Copyright (c) 2008 Ryan Mallon <ryan@bluewatersys.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/device.h>
#include <linux/slab.h>
#include <linux/dma-mapping.h>

#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>

#include <mach/dma.h>
#include <mach/hardware.h>
#include <mach/ep93xx-regs.h>

#include "ep93xx-pcm.h"

static const struct snd_pcm_hardware ep93xx_pcm_hardware = {
      .info             = (SNDRV_PCM_INFO_MMAP        |
                           SNDRV_PCM_INFO_MMAP_VALID  |
                           SNDRV_PCM_INFO_INTERLEAVED |
                           SNDRV_PCM_INFO_BLOCK_TRANSFER),
                           
      .rates                  = SNDRV_PCM_RATE_8000_96000,
      .rate_min         = SNDRV_PCM_RATE_8000,
      .rate_max         = SNDRV_PCM_RATE_96000,
      
      .formats          = (SNDRV_PCM_FMTBIT_S16_LE |
                           SNDRV_PCM_FMTBIT_S24_LE |
                           SNDRV_PCM_FMTBIT_S32_LE),
      
      .buffer_bytes_max = 131072,
      .period_bytes_min = 32,
      .period_bytes_max = 32768,
      .periods_min            = 1,
      .periods_max            = 32,
      .fifo_size        = 32,
};

00054 struct ep93xx_runtime_data
{
      struct ep93xx_dma_m2p_client  cl;
      struct ep93xx_pcm_dma_params  *params;
      int                     pointer_bytes;
      struct tasklet_struct         period_tasklet;
      int                     periods;
      struct ep93xx_dma_buffer      buf[32];
};

static void ep93xx_pcm_period_elapsed(unsigned long data)
{
      struct snd_pcm_substream *substream = (struct snd_pcm_substream *)data;
      snd_pcm_period_elapsed(substream);
}

static void ep93xx_pcm_buffer_started(void *cookie,
                              struct ep93xx_dma_buffer *buf)
{
}

static void ep93xx_pcm_buffer_finished(void *cookie, 
                               struct ep93xx_dma_buffer *buf, 
                               int bytes, int error)
{
      struct snd_pcm_substream *substream = cookie;
      struct ep93xx_runtime_data *rtd = substream->runtime->private_data;

      if (buf == rtd->buf + rtd->periods - 1)
            rtd->pointer_bytes = 0;
      else
            rtd->pointer_bytes += buf->size;

      if (!error) {
            ep93xx_dma_m2p_submit_recursive(&rtd->cl, buf);
            tasklet_schedule(&rtd->period_tasklet);
      } else {
            snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
      }
}

static int ep93xx_pcm_open(struct snd_pcm_substream *substream)
{
      struct snd_soc_pcm_runtime *soc_rtd = substream->private_data;
      struct snd_soc_dai *cpu_dai = soc_rtd->cpu_dai;
      struct ep93xx_pcm_dma_params *dma_params;
      struct ep93xx_runtime_data *rtd;    
      int ret;

      dma_params = snd_soc_dai_get_dma_data(cpu_dai, substream);
      snd_soc_set_runtime_hwparams(substream, &ep93xx_pcm_hardware);

      rtd = kmalloc(sizeof(*rtd), GFP_KERNEL);
      if (!rtd) 
            return -ENOMEM;

      memset(&rtd->period_tasklet, 0, sizeof(rtd->period_tasklet));
      rtd->period_tasklet.func = ep93xx_pcm_period_elapsed;
      rtd->period_tasklet.data = (unsigned long)substream;

      rtd->cl.name = dma_params->name;
      rtd->cl.flags = dma_params->dma_port | EP93XX_DMA_M2P_IGNORE_ERROR |
            ((substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
             EP93XX_DMA_M2P_TX : EP93XX_DMA_M2P_RX);
      rtd->cl.cookie = substream;
      rtd->cl.buffer_started = ep93xx_pcm_buffer_started;
      rtd->cl.buffer_finished = ep93xx_pcm_buffer_finished;
      ret = ep93xx_dma_m2p_client_register(&rtd->cl);
      if (ret < 0) {
            kfree(rtd);
            return ret;
      }
      
      substream->runtime->private_data = rtd;
      return 0;
}

static int ep93xx_pcm_close(struct snd_pcm_substream *substream)
{
      struct ep93xx_runtime_data *rtd = substream->runtime->private_data;

      ep93xx_dma_m2p_client_unregister(&rtd->cl);
      kfree(rtd);
      return 0;
}

static int ep93xx_pcm_hw_params(struct snd_pcm_substream *substream,
                        struct snd_pcm_hw_params *params)
{
      struct snd_pcm_runtime *runtime = substream->runtime;
      struct ep93xx_runtime_data *rtd = runtime->private_data;
      size_t totsize = params_buffer_bytes(params);
      size_t period = params_period_bytes(params);
      int i;

      snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
      runtime->dma_bytes = totsize;

      rtd->periods = (totsize + period - 1) / period;
      for (i = 0; i < rtd->periods; i++) {
            rtd->buf[i].bus_addr = runtime->dma_addr + (i * period);
            rtd->buf[i].size = period;
            if ((i + 1) * period > totsize)
                  rtd->buf[i].size = totsize - (i * period);
      }

      return 0;
}

static int ep93xx_pcm_hw_free(struct snd_pcm_substream *substream)
{
      snd_pcm_set_runtime_buffer(substream, NULL);
      return 0;
}

static int ep93xx_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
{
      struct ep93xx_runtime_data *rtd = substream->runtime->private_data;
      int ret;
      int i;

      ret = 0;
      switch (cmd) {
      case SNDRV_PCM_TRIGGER_START:
      case SNDRV_PCM_TRIGGER_RESUME:
      case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
            rtd->pointer_bytes = 0;
            for (i = 0; i < rtd->periods; i++)
                  ep93xx_dma_m2p_submit(&rtd->cl, rtd->buf + i);
            break;

      case SNDRV_PCM_TRIGGER_STOP:
      case SNDRV_PCM_TRIGGER_SUSPEND:
      case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
            ep93xx_dma_m2p_flush(&rtd->cl);
            break;

      default:
            ret = -EINVAL;
            break;
      }

      return ret;
}

static snd_pcm_uframes_t ep93xx_pcm_pointer(struct snd_pcm_substream *substream)
{
      struct snd_pcm_runtime *runtime = substream->runtime;
      struct ep93xx_runtime_data *rtd = substream->runtime->private_data;

      /* FIXME: implement this with sub-period granularity */
      return bytes_to_frames(runtime, rtd->pointer_bytes);
}

static int ep93xx_pcm_mmap(struct snd_pcm_substream *substream,
                     struct vm_area_struct *vma)
{
      struct snd_pcm_runtime *runtime = substream->runtime;

      return dma_mmap_writecombine(substream->pcm->card->dev, vma,
                             runtime->dma_area,
                             runtime->dma_addr,
                             runtime->dma_bytes);
}

static struct snd_pcm_ops ep93xx_pcm_ops = {
      .open       = ep93xx_pcm_open,
      .close            = ep93xx_pcm_close,
      .ioctl            = snd_pcm_lib_ioctl,
      .hw_params  = ep93xx_pcm_hw_params,
      .hw_free    = ep93xx_pcm_hw_free,
      .trigger    = ep93xx_pcm_trigger,
      .pointer    = ep93xx_pcm_pointer,
      .mmap       = ep93xx_pcm_mmap,
};

static int ep93xx_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream)
{
      struct snd_pcm_substream *substream = pcm->streams[stream].substream;
      struct snd_dma_buffer *buf = &substream->dma_buffer;
      size_t size = ep93xx_pcm_hardware.buffer_bytes_max;

      buf->dev.type = SNDRV_DMA_TYPE_DEV;
      buf->dev.dev = pcm->card->dev;
      buf->private_data = NULL;
      buf->area = dma_alloc_writecombine(pcm->card->dev, size,
                                 &buf->addr, GFP_KERNEL);
      buf->bytes = size;

      return (buf->area == NULL) ? -ENOMEM : 0;
}

static void ep93xx_pcm_free_dma_buffers(struct snd_pcm *pcm)
{
      struct snd_pcm_substream *substream;
      struct snd_dma_buffer *buf;
      int stream;

      for (stream = 0; stream < 2; stream++) {        
            substream = pcm->streams[stream].substream;
            if (!substream)
                  continue;
            
            buf = &substream->dma_buffer;
            if (!buf->area)
                  continue;

            dma_free_writecombine(pcm->card->dev, buf->bytes, buf->area,
                              buf->addr);
            buf->area = NULL;
      }
}

static u64 ep93xx_pcm_dmamask = 0xffffffff;

static int ep93xx_pcm_new(struct snd_card *card, struct snd_soc_dai *dai,
                    struct snd_pcm *pcm)
{
      int ret = 0;

      if (!card->dev->dma_mask)
            card->dev->dma_mask = &ep93xx_pcm_dmamask;
      if (!card->dev->coherent_dma_mask)
            card->dev->coherent_dma_mask = 0xffffffff;

      if (dai->driver->playback.channels_min) {
            ret = ep93xx_pcm_preallocate_dma_buffer(pcm,
                              SNDRV_PCM_STREAM_PLAYBACK);
            if (ret)
                  return ret;
      }

      if (dai->driver->capture.channels_min) {
            ret = ep93xx_pcm_preallocate_dma_buffer(pcm,
                              SNDRV_PCM_STREAM_CAPTURE);
            if (ret)
                  return ret;
      }

      return 0;
}

static struct snd_soc_platform_driver ep93xx_soc_platform = {
      .ops        = &ep93xx_pcm_ops,
      .pcm_new    = &ep93xx_pcm_new,
      .pcm_free   = &ep93xx_pcm_free_dma_buffers,
};

static int __devinit ep93xx_soc_platform_probe(struct platform_device *pdev)
{
      return snd_soc_register_platform(&pdev->dev, &ep93xx_soc_platform);
}

static int __devexit ep93xx_soc_platform_remove(struct platform_device *pdev)
{
      snd_soc_unregister_platform(&pdev->dev);
      return 0;
}

static struct platform_driver ep93xx_pcm_driver = {
      .driver = {
                  .name = "ep93xx-pcm-audio",
                  .owner = THIS_MODULE,
      },

      .probe = ep93xx_soc_platform_probe,
      .remove = __devexit_p(ep93xx_soc_platform_remove),
};

static int __init ep93xx_soc_platform_init(void)
{
      return platform_driver_register(&ep93xx_pcm_driver);
}

static void __exit ep93xx_soc_platform_exit(void)
{
      platform_driver_unregister(&ep93xx_pcm_driver);
}

module_init(ep93xx_soc_platform_init);
module_exit(ep93xx_soc_platform_exit);

MODULE_AUTHOR("Ryan Mallon <ryan@bluewatersys.com>");
MODULE_DESCRIPTION("EP93xx ALSA PCM interface");
MODULE_LICENSE("GPL");

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