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txx9aclc.c

/*
 * Generic TXx9 ACLC platform driver
 *
 * Copyright (C) 2009 Atsushi Nemoto
 *
 * Based on RBTX49xx patch from CELF patch archive.
 * (C) Copyright TOSHIBA CORPORATION 2004-2006
 *
 * 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/platform_device.h>
#include <linux/scatterlist.h>
#include <linux/slab.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>
#include "txx9aclc.h"

00025 static struct txx9aclc_soc_device {
      struct txx9aclc_dmadata dmadata[2];
} txx9aclc_soc_device;

/* REVISIT: How to find txx9aclc_drvdata from snd_ac97? */
static struct txx9aclc_plat_drvdata *txx9aclc_drvdata;

static int txx9aclc_dma_init(struct txx9aclc_soc_device *dev,
                       struct txx9aclc_dmadata *dmadata);

static const struct snd_pcm_hardware txx9aclc_pcm_hardware = {
      /*
       * REVISIT: SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID
       * needs more works for noncoherent MIPS.
       */
      .info         = SNDRV_PCM_INFO_INTERLEAVED |
                      SNDRV_PCM_INFO_BATCH |
                      SNDRV_PCM_INFO_PAUSE,
#ifdef __BIG_ENDIAN
      .formats      = SNDRV_PCM_FMTBIT_S16_BE,
#else
      .formats      = SNDRV_PCM_FMTBIT_S16_LE,
#endif
      .period_bytes_min = 1024,
      .period_bytes_max = 8 * 1024,
      .periods_min        = 2,
      .periods_max        = 4096,
      .buffer_bytes_max = 32 * 1024,
};

static int txx9aclc_pcm_hw_params(struct snd_pcm_substream *substream,
                          struct snd_pcm_hw_params *params)
{
      struct snd_soc_pcm_runtime *rtd = snd_pcm_substream_chip(substream);
      struct snd_pcm_runtime *runtime = substream->runtime;
      struct txx9aclc_dmadata *dmadata = runtime->private_data;
      int ret;

      ret = snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(params));
      if (ret < 0)
            return ret;

      dev_dbg(rtd->platform->dev,
            "runtime->dma_area = %#lx dma_addr = %#lx dma_bytes = %zd "
            "runtime->min_align %ld\n",
            (unsigned long)runtime->dma_area,
            (unsigned long)runtime->dma_addr, runtime->dma_bytes,
            runtime->min_align);
      dev_dbg(rtd->platform->dev,
            "periods %d period_bytes %d stream %d\n",
            params_periods(params), params_period_bytes(params),
            substream->stream);

      dmadata->substream = substream;
      dmadata->pos = 0;
      return 0;
}

static int txx9aclc_pcm_hw_free(struct snd_pcm_substream *substream)
{
      return snd_pcm_lib_free_pages(substream);
}

static int txx9aclc_pcm_prepare(struct snd_pcm_substream *substream)
{
      struct snd_pcm_runtime *runtime = substream->runtime;
      struct txx9aclc_dmadata *dmadata = runtime->private_data;

      dmadata->dma_addr = runtime->dma_addr;
      dmadata->buffer_bytes = snd_pcm_lib_buffer_bytes(substream);
      dmadata->period_bytes = snd_pcm_lib_period_bytes(substream);

      if (dmadata->buffer_bytes == dmadata->period_bytes) {
            dmadata->frag_bytes = dmadata->period_bytes >> 1;
            dmadata->frags = 2;
      } else {
            dmadata->frag_bytes = dmadata->period_bytes;
            dmadata->frags = dmadata->buffer_bytes / dmadata->period_bytes;
      }
      dmadata->frag_count = 0;
      dmadata->pos = 0;
      return 0;
}

static void txx9aclc_dma_complete(void *arg)
{
      struct txx9aclc_dmadata *dmadata = arg;
      unsigned long flags;

      /* dma completion handler cannot submit new operations */
      spin_lock_irqsave(&dmadata->dma_lock, flags);
      if (dmadata->frag_count >= 0) {
            dmadata->dmacount--;
            BUG_ON(dmadata->dmacount < 0);
            tasklet_schedule(&dmadata->tasklet);
      }
      spin_unlock_irqrestore(&dmadata->dma_lock, flags);
}

static struct dma_async_tx_descriptor *
txx9aclc_dma_submit(struct txx9aclc_dmadata *dmadata, dma_addr_t buf_dma_addr)
{
      struct dma_chan *chan = dmadata->dma_chan;
      struct dma_async_tx_descriptor *desc;
      struct scatterlist sg;

      sg_init_table(&sg, 1);
      sg_set_page(&sg, pfn_to_page(PFN_DOWN(buf_dma_addr)),
                dmadata->frag_bytes, buf_dma_addr & (PAGE_SIZE - 1));
      sg_dma_address(&sg) = buf_dma_addr;
      desc = chan->device->device_prep_slave_sg(chan, &sg, 1,
            dmadata->substream->stream == SNDRV_PCM_STREAM_PLAYBACK ?
            DMA_TO_DEVICE : DMA_FROM_DEVICE,
            DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
      if (!desc) {
            dev_err(&chan->dev->device, "cannot prepare slave dma\n");
            return NULL;
      }
      desc->callback = txx9aclc_dma_complete;
      desc->callback_param = dmadata;
      desc->tx_submit(desc);
      return desc;
}

#define NR_DMA_CHAIN          2

static void txx9aclc_dma_tasklet(unsigned long data)
{
      struct txx9aclc_dmadata *dmadata = (struct txx9aclc_dmadata *)data;
      struct dma_chan *chan = dmadata->dma_chan;
      struct dma_async_tx_descriptor *desc;
      struct snd_pcm_substream *substream = dmadata->substream;
      u32 ctlbit = substream->stream == SNDRV_PCM_STREAM_PLAYBACK ?
            ACCTL_AUDODMA : ACCTL_AUDIDMA;
      int i;
      unsigned long flags;

      spin_lock_irqsave(&dmadata->dma_lock, flags);
      if (dmadata->frag_count < 0) {
            struct txx9aclc_plat_drvdata *drvdata = txx9aclc_drvdata;
            void __iomem *base = drvdata->base;

            spin_unlock_irqrestore(&dmadata->dma_lock, flags);
            chan->device->device_control(chan, DMA_TERMINATE_ALL, 0);
            /* first time */
            for (i = 0; i < NR_DMA_CHAIN; i++) {
                  desc = txx9aclc_dma_submit(dmadata,
                        dmadata->dma_addr + i * dmadata->frag_bytes);
                  if (!desc)
                        return;
            }
            dmadata->dmacount = NR_DMA_CHAIN;
            chan->device->device_issue_pending(chan);
            spin_lock_irqsave(&dmadata->dma_lock, flags);
            __raw_writel(ctlbit, base + ACCTLEN);
            dmadata->frag_count = NR_DMA_CHAIN % dmadata->frags;
            spin_unlock_irqrestore(&dmadata->dma_lock, flags);
            return;
      }
      BUG_ON(dmadata->dmacount >= NR_DMA_CHAIN);
      while (dmadata->dmacount < NR_DMA_CHAIN) {
            dmadata->dmacount++;
            spin_unlock_irqrestore(&dmadata->dma_lock, flags);
            desc = txx9aclc_dma_submit(dmadata,
                  dmadata->dma_addr +
                  dmadata->frag_count * dmadata->frag_bytes);
            if (!desc)
                  return;
            chan->device->device_issue_pending(chan);

            spin_lock_irqsave(&dmadata->dma_lock, flags);
            dmadata->frag_count++;
            dmadata->frag_count %= dmadata->frags;
            dmadata->pos += dmadata->frag_bytes;
            dmadata->pos %= dmadata->buffer_bytes;
            if ((dmadata->frag_count * dmadata->frag_bytes) %
                dmadata->period_bytes == 0)
                  snd_pcm_period_elapsed(substream);
      }
      spin_unlock_irqrestore(&dmadata->dma_lock, flags);
}

static int txx9aclc_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
{
      struct txx9aclc_dmadata *dmadata = substream->runtime->private_data;
      struct txx9aclc_plat_drvdata *drvdata =txx9aclc_drvdata;
      void __iomem *base = drvdata->base;
      unsigned long flags;
      int ret = 0;
      u32 ctlbit = substream->stream == SNDRV_PCM_STREAM_PLAYBACK ?
            ACCTL_AUDODMA : ACCTL_AUDIDMA;

      spin_lock_irqsave(&dmadata->dma_lock, flags);
      switch (cmd) {
      case SNDRV_PCM_TRIGGER_START:
            dmadata->frag_count = -1;
            tasklet_schedule(&dmadata->tasklet);
            break;
      case SNDRV_PCM_TRIGGER_STOP:
      case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
      case SNDRV_PCM_TRIGGER_SUSPEND:
            __raw_writel(ctlbit, base + ACCTLDIS);
            break;
      case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
      case SNDRV_PCM_TRIGGER_RESUME:
            __raw_writel(ctlbit, base + ACCTLEN);
            break;
      default:
            ret = -EINVAL;
      }
      spin_unlock_irqrestore(&dmadata->dma_lock, flags);
      return ret;
}

static snd_pcm_uframes_t
txx9aclc_pcm_pointer(struct snd_pcm_substream *substream)
{
      struct txx9aclc_dmadata *dmadata = substream->runtime->private_data;

      return bytes_to_frames(substream->runtime, dmadata->pos);
}

static int txx9aclc_pcm_open(struct snd_pcm_substream *substream)
{
      struct txx9aclc_soc_device *dev = &txx9aclc_soc_device;
      struct txx9aclc_dmadata *dmadata = &dev->dmadata[substream->stream];
      int ret;

      ret = snd_soc_set_runtime_hwparams(substream, &txx9aclc_pcm_hardware);
      if (ret)
            return ret;
      /* ensure that buffer size is a multiple of period size */
      ret = snd_pcm_hw_constraint_integer(substream->runtime,
                                  SNDRV_PCM_HW_PARAM_PERIODS);
      if (ret < 0)
            return ret;
      substream->runtime->private_data = dmadata;
      return 0;
}

static int txx9aclc_pcm_close(struct snd_pcm_substream *substream)
{
      struct txx9aclc_dmadata *dmadata = substream->runtime->private_data;
      struct dma_chan *chan = dmadata->dma_chan;

      dmadata->frag_count = -1;
      chan->device->device_control(chan, DMA_TERMINATE_ALL, 0);
      return 0;
}

static struct snd_pcm_ops txx9aclc_pcm_ops = {
      .open       = txx9aclc_pcm_open,
      .close            = txx9aclc_pcm_close,
      .ioctl            = snd_pcm_lib_ioctl,
      .hw_params  = txx9aclc_pcm_hw_params,
      .hw_free    = txx9aclc_pcm_hw_free,
      .prepare    = txx9aclc_pcm_prepare,
      .trigger    = txx9aclc_pcm_trigger,
      .pointer    = txx9aclc_pcm_pointer,
};

static void txx9aclc_pcm_free_dma_buffers(struct snd_pcm *pcm)
{
      snd_pcm_lib_preallocate_free_for_all(pcm);
}

static int txx9aclc_pcm_new(struct snd_card *card, struct snd_soc_dai *dai,
                      struct snd_pcm *pcm)
{
      struct platform_device *pdev = to_platform_device(dai->platform->dev);
      struct txx9aclc_soc_device *dev;
      struct resource *r;
      int i;
      int ret;

      /* at this point onwards the AC97 component has probed and this will be valid */
      dev = snd_soc_dai_get_drvdata(dai);

      dev->dmadata[0].stream = SNDRV_PCM_STREAM_PLAYBACK;
      dev->dmadata[1].stream = SNDRV_PCM_STREAM_CAPTURE;
      for (i = 0; i < 2; i++) {
            r = platform_get_resource(pdev, IORESOURCE_DMA, i);
            if (!r) {
                  ret = -EBUSY;
                  goto exit;
            }
            dev->dmadata[i].dma_res = r;
            ret = txx9aclc_dma_init(dev, &dev->dmadata[i]);
            if (ret)
                  goto exit;
      }
      return snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV,
            card->dev, 64 * 1024, 4 * 1024 * 1024);

exit:
      for (i = 0; i < 2; i++) {
            if (dev->dmadata[i].dma_chan)
                  dma_release_channel(dev->dmadata[i].dma_chan);
            dev->dmadata[i].dma_chan = NULL;
      }
      return ret;
}

static bool filter(struct dma_chan *chan, void *param)
{
      struct txx9aclc_dmadata *dmadata = param;
      char *devname;
      bool found = false;

      devname = kasprintf(GFP_KERNEL, "%s.%d", dmadata->dma_res->name,
            (int)dmadata->dma_res->start);
      if (strcmp(dev_name(chan->device->dev), devname) == 0) {
            chan->private = &dmadata->dma_slave;
            found = true;
      }
      kfree(devname);
      return found;
}

static int txx9aclc_dma_init(struct txx9aclc_soc_device *dev,
                       struct txx9aclc_dmadata *dmadata)
{
      struct txx9aclc_plat_drvdata *drvdata =txx9aclc_drvdata;
      struct txx9dmac_slave *ds = &dmadata->dma_slave;
      dma_cap_mask_t mask;

      spin_lock_init(&dmadata->dma_lock);

      ds->reg_width = sizeof(u32);
      if (dmadata->stream == SNDRV_PCM_STREAM_PLAYBACK) {
            ds->tx_reg = drvdata->physbase + ACAUDODAT;
            ds->rx_reg = 0;
      } else {
            ds->tx_reg = 0;
            ds->rx_reg = drvdata->physbase + ACAUDIDAT;
      }

      /* Try to grab a DMA channel */
      dma_cap_zero(mask);
      dma_cap_set(DMA_SLAVE, mask);
      dmadata->dma_chan = dma_request_channel(mask, filter, dmadata);
      if (!dmadata->dma_chan) {
            printk(KERN_ERR
                  "DMA channel for %s is not available\n",
                  dmadata->stream == SNDRV_PCM_STREAM_PLAYBACK ?
                  "playback" : "capture");
            return -EBUSY;
      }
      tasklet_init(&dmadata->tasklet, txx9aclc_dma_tasklet,
                 (unsigned long)dmadata);
      return 0;
}

static int txx9aclc_pcm_probe(struct snd_soc_platform *platform)
{
      snd_soc_platform_set_drvdata(platform, &txx9aclc_soc_device);
      return 0;
}

static int txx9aclc_pcm_remove(struct snd_soc_platform *platform)
{
      struct txx9aclc_soc_device *dev = snd_soc_platform_get_drvdata(platform);
      struct txx9aclc_plat_drvdata *drvdata = txx9aclc_drvdata;
      void __iomem *base = drvdata->base;
      int i;

      /* disable all FIFO DMAs */
      __raw_writel(ACCTL_AUDODMA | ACCTL_AUDIDMA, base + ACCTLDIS);
      /* dummy R/W to clear pending DMAREQ if any */
      __raw_writel(__raw_readl(base + ACAUDIDAT), base + ACAUDODAT);

      for (i = 0; i < 2; i++) {
            struct txx9aclc_dmadata *dmadata = &dev->dmadata[i];
            struct dma_chan *chan = dmadata->dma_chan;
            if (chan) {
                  dmadata->frag_count = -1;
                  chan->device->device_control(chan,
                                         DMA_TERMINATE_ALL, 0);
                  dma_release_channel(chan);
            }
            dev->dmadata[i].dma_chan = NULL;
      }
      return 0;
}

static struct snd_soc_platform_driver txx9aclc_soc_platform = {
      .probe            = txx9aclc_pcm_probe,
      .remove           = txx9aclc_pcm_remove,
      .ops        = &txx9aclc_pcm_ops,
      .pcm_new    = txx9aclc_pcm_new,
      .pcm_free   = txx9aclc_pcm_free_dma_buffers,
};

static int __devinit txx9aclc_soc_platform_probe(struct platform_device *pdev)
{
      return snd_soc_register_platform(&pdev->dev, &txx9aclc_soc_platform);
}

static int __devexit txx9aclc_soc_platform_remove(struct platform_device *pdev)
{
      snd_soc_unregister_platform(&pdev->dev);
      return 0;
}

static struct platform_driver txx9aclc_pcm_driver = {
      .driver = {
                  .name = "txx9aclc-pcm-audio",
                  .owner = THIS_MODULE,
      },

      .probe = txx9aclc_soc_platform_probe,
      .remove = __devexit_p(txx9aclc_soc_platform_remove),
};

static int __init snd_txx9aclc_pcm_init(void)
{
      return platform_driver_register(&txx9aclc_pcm_driver);
}
module_init(snd_txx9aclc_pcm_init);

static void __exit snd_txx9aclc_pcm_exit(void)
{
      platform_driver_unregister(&txx9aclc_pcm_driver);
}
module_exit(snd_txx9aclc_pcm_exit);

MODULE_AUTHOR("Atsushi Nemoto <anemo@mba.ocn.ne.jp>");
MODULE_DESCRIPTION("TXx9 ACLC Audio DMA driver");
MODULE_LICENSE("GPL");

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