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siu_pcm.c

/*
 * siu_pcm.c - ALSA driver for Renesas SH7343, SH7722 SIU peripheral.
 *
 * Copyright (C) 2009-2010 Guennadi Liakhovetski <g.liakhovetski@gmx.de>
 * Copyright (C) 2006 Carlos Munoz <carlos@kenati.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */
#include <linux/delay.h>
#include <linux/dma-mapping.h>
#include <linux/dmaengine.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/platform_device.h>

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

#include <asm/siu.h>

#include "siu.h"

#define GET_MAX_PERIODS(buf_bytes, period_bytes) \
                        ((buf_bytes) / (period_bytes))
#define PERIOD_OFFSET(buf_addr, period_num, period_bytes) \
                        ((buf_addr) + ((period_num) * (period_bytes)))

#define RWF_STM_RD            0x01        /* Read in progress */
#define RWF_STM_WT            0x02        /* Write in progress */

struct siu_port *siu_ports[SIU_PORT_NUM];

/* transfersize is number of u32 dma transfers per period */
static int siu_pcm_stmwrite_stop(struct siu_port *port_info)
{
      struct siu_info *info = siu_i2s_data;
      u32 __iomem *base = info->reg;
      struct siu_stream *siu_stream = &port_info->playback;
      u32 stfifo;

      if (!siu_stream->rw_flg)
            return -EPERM;

      /* output FIFO disable */
      stfifo = siu_read32(base + SIU_STFIFO);
      siu_write32(base + SIU_STFIFO, stfifo & ~0x0c180c18);
      pr_debug("%s: STFIFO %x -> %x\n", __func__,
             stfifo, stfifo & ~0x0c180c18);

      /* during stmwrite clear */
      siu_stream->rw_flg = 0;

      return 0;
}

static int siu_pcm_stmwrite_start(struct siu_port *port_info)
{
      struct siu_stream *siu_stream = &port_info->playback;

      if (siu_stream->rw_flg)
            return -EPERM;

      /* Current period in buffer */
      port_info->playback.cur_period = 0;

      /* during stmwrite flag set */
      siu_stream->rw_flg = RWF_STM_WT;

      /* DMA transfer start */
      tasklet_schedule(&siu_stream->tasklet);

      return 0;
}

static void siu_dma_tx_complete(void *arg)
{
      struct siu_stream *siu_stream = arg;

      if (!siu_stream->rw_flg)
            return;

      /* Update completed period count */
      if (++siu_stream->cur_period >=
          GET_MAX_PERIODS(siu_stream->buf_bytes,
                      siu_stream->period_bytes))
            siu_stream->cur_period = 0;

      pr_debug("%s: done period #%d (%u/%u bytes), cookie %d\n",
            __func__, siu_stream->cur_period,
            siu_stream->cur_period * siu_stream->period_bytes,
            siu_stream->buf_bytes, siu_stream->cookie);

      tasklet_schedule(&siu_stream->tasklet);

      /* Notify alsa: a period is done */
      snd_pcm_period_elapsed(siu_stream->substream);
}

static int siu_pcm_wr_set(struct siu_port *port_info,
                    dma_addr_t buff, u32 size)
{
      struct siu_info *info = siu_i2s_data;
      u32 __iomem *base = info->reg;
      struct siu_stream *siu_stream = &port_info->playback;
      struct snd_pcm_substream *substream = siu_stream->substream;
      struct device *dev = substream->pcm->card->dev;
      struct dma_async_tx_descriptor *desc;
      dma_cookie_t cookie;
      struct scatterlist sg;
      u32 stfifo;

      sg_init_table(&sg, 1);
      sg_set_page(&sg, pfn_to_page(PFN_DOWN(buff)),
                size, offset_in_page(buff));
      sg_dma_len(&sg) = size;
      sg_dma_address(&sg) = buff;

      desc = siu_stream->chan->device->device_prep_slave_sg(siu_stream->chan,
            &sg, 1, DMA_TO_DEVICE, DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
      if (!desc) {
            dev_err(dev, "Failed to allocate a dma descriptor\n");
            return -ENOMEM;
      }

      desc->callback = siu_dma_tx_complete;
      desc->callback_param = siu_stream;
      cookie = desc->tx_submit(desc);
      if (cookie < 0) {
            dev_err(dev, "Failed to submit a dma transfer\n");
            return cookie;
      }

      siu_stream->tx_desc = desc;
      siu_stream->cookie = cookie;

      dma_async_issue_pending(siu_stream->chan);

      /* only output FIFO enable */
      stfifo = siu_read32(base + SIU_STFIFO);
      siu_write32(base + SIU_STFIFO, stfifo | (port_info->stfifo & 0x0c180c18));
      dev_dbg(dev, "%s: STFIFO %x -> %x\n", __func__,
            stfifo, stfifo | (port_info->stfifo & 0x0c180c18));

      return 0;
}

static int siu_pcm_rd_set(struct siu_port *port_info,
                    dma_addr_t buff, size_t size)
{
      struct siu_info *info = siu_i2s_data;
      u32 __iomem *base = info->reg;
      struct siu_stream *siu_stream = &port_info->capture;
      struct snd_pcm_substream *substream = siu_stream->substream;
      struct device *dev = substream->pcm->card->dev;
      struct dma_async_tx_descriptor *desc;
      dma_cookie_t cookie;
      struct scatterlist sg;
      u32 stfifo;

      dev_dbg(dev, "%s: %u@%llx\n", __func__, size, (unsigned long long)buff);

      sg_init_table(&sg, 1);
      sg_set_page(&sg, pfn_to_page(PFN_DOWN(buff)),
                size, offset_in_page(buff));
      sg_dma_len(&sg) = size;
      sg_dma_address(&sg) = buff;

      desc = siu_stream->chan->device->device_prep_slave_sg(siu_stream->chan,
            &sg, 1, DMA_FROM_DEVICE, DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
      if (!desc) {
            dev_err(dev, "Failed to allocate dma descriptor\n");
            return -ENOMEM;
      }

      desc->callback = siu_dma_tx_complete;
      desc->callback_param = siu_stream;
      cookie = desc->tx_submit(desc);
      if (cookie < 0) {
            dev_err(dev, "Failed to submit dma descriptor\n");
            return cookie;
      }

      siu_stream->tx_desc = desc;
      siu_stream->cookie = cookie;

      dma_async_issue_pending(siu_stream->chan);

      /* only input FIFO enable */
      stfifo = siu_read32(base + SIU_STFIFO);
      siu_write32(base + SIU_STFIFO, siu_read32(base + SIU_STFIFO) |
                (port_info->stfifo & 0x13071307));
      dev_dbg(dev, "%s: STFIFO %x -> %x\n", __func__,
            stfifo, stfifo | (port_info->stfifo & 0x13071307));

      return 0;
}

static void siu_io_tasklet(unsigned long data)
{
      struct siu_stream *siu_stream = (struct siu_stream *)data;
      struct snd_pcm_substream *substream = siu_stream->substream;
      struct device *dev = substream->pcm->card->dev;
      struct snd_pcm_runtime *rt = substream->runtime;
      struct siu_port *port_info = siu_port_info(substream);

      dev_dbg(dev, "%s: flags %x\n", __func__, siu_stream->rw_flg);

      if (!siu_stream->rw_flg) {
            dev_dbg(dev, "%s: stream inactive\n", __func__);
            return;
      }

      if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) {
            dma_addr_t buff;
            size_t count;
            u8 *virt;

            buff = (dma_addr_t)PERIOD_OFFSET(rt->dma_addr,
                                    siu_stream->cur_period,
                                    siu_stream->period_bytes);
            virt = PERIOD_OFFSET(rt->dma_area,
                             siu_stream->cur_period,
                             siu_stream->period_bytes);
            count = siu_stream->period_bytes;

            /* DMA transfer start */
            siu_pcm_rd_set(port_info, buff, count);
      } else {
            siu_pcm_wr_set(port_info,
                         (dma_addr_t)PERIOD_OFFSET(rt->dma_addr,
                                    siu_stream->cur_period,
                                    siu_stream->period_bytes),
                         siu_stream->period_bytes);
      }
}

/* Capture */
static int siu_pcm_stmread_start(struct siu_port *port_info)
{
      struct siu_stream *siu_stream = &port_info->capture;

      if (siu_stream->xfer_cnt > 0x1000000)
            return -EINVAL;
      if (siu_stream->rw_flg)
            return -EPERM;

      /* Current period in buffer */
      siu_stream->cur_period = 0;

      /* during stmread flag set */
      siu_stream->rw_flg = RWF_STM_RD;

      tasklet_schedule(&siu_stream->tasklet);

      return 0;
}

static int siu_pcm_stmread_stop(struct siu_port *port_info)
{
      struct siu_info *info = siu_i2s_data;
      u32 __iomem *base = info->reg;
      struct siu_stream *siu_stream = &port_info->capture;
      struct device *dev = siu_stream->substream->pcm->card->dev;
      u32 stfifo;

      if (!siu_stream->rw_flg)
            return -EPERM;

      /* input FIFO disable */
      stfifo = siu_read32(base + SIU_STFIFO);
      siu_write32(base + SIU_STFIFO, stfifo & ~0x13071307);
      dev_dbg(dev, "%s: STFIFO %x -> %x\n", __func__,
            stfifo, stfifo & ~0x13071307);

      /* during stmread flag clear */
      siu_stream->rw_flg = 0;

      return 0;
}

static int siu_pcm_hw_params(struct snd_pcm_substream *ss,
                       struct snd_pcm_hw_params *hw_params)
{
      struct siu_info *info = siu_i2s_data;
      struct device *dev = ss->pcm->card->dev;
      int ret;

      dev_dbg(dev, "%s: port=%d\n", __func__, info->port_id);

      ret = snd_pcm_lib_malloc_pages(ss, params_buffer_bytes(hw_params));
      if (ret < 0)
            dev_err(dev, "snd_pcm_lib_malloc_pages() failed\n");

      return ret;
}

static int siu_pcm_hw_free(struct snd_pcm_substream *ss)
{
      struct siu_info *info = siu_i2s_data;
      struct siu_port   *port_info = siu_port_info(ss);
      struct device *dev = ss->pcm->card->dev;
      struct siu_stream *siu_stream;

      if (ss->stream == SNDRV_PCM_STREAM_PLAYBACK)
            siu_stream = &port_info->playback;
      else
            siu_stream = &port_info->capture;

      dev_dbg(dev, "%s: port=%d\n", __func__, info->port_id);

      return snd_pcm_lib_free_pages(ss);
}

static bool filter(struct dma_chan *chan, void *slave)
{
      struct sh_dmae_slave *param = slave;

      pr_debug("%s: slave ID %d\n", __func__, param->slave_id);

      if (unlikely(param->dma_dev != chan->device->dev))
            return false;

      chan->private = param;
      return true;
}

static int siu_pcm_open(struct snd_pcm_substream *ss)
{
      /* Playback / Capture */
      struct snd_soc_pcm_runtime *rtd = ss->private_data;
      struct siu_platform *pdata = rtd->platform->dev->platform_data;
      struct siu_info *info = siu_i2s_data;
      struct siu_port *port_info = siu_port_info(ss);
      struct siu_stream *siu_stream;
      u32 port = info->port_id;
      struct device *dev = ss->pcm->card->dev;
      dma_cap_mask_t mask;
      struct sh_dmae_slave *param;

      dma_cap_zero(mask);
      dma_cap_set(DMA_SLAVE, mask);

      dev_dbg(dev, "%s, port=%d@%p\n", __func__, port, port_info);

      if (ss->stream == SNDRV_PCM_STREAM_PLAYBACK) {
            siu_stream = &port_info->playback;
            param = &siu_stream->param;
            param->slave_id = port ? pdata->dma_slave_tx_b :
                  pdata->dma_slave_tx_a;
      } else {
            siu_stream = &port_info->capture;
            param = &siu_stream->param;
            param->slave_id = port ? pdata->dma_slave_rx_b :
                  pdata->dma_slave_rx_a;
      }

      param->dma_dev = pdata->dma_dev;
      /* Get DMA channel */
      siu_stream->chan = dma_request_channel(mask, filter, param);
      if (!siu_stream->chan) {
            dev_err(dev, "DMA channel allocation failed!\n");
            return -EBUSY;
      }

      siu_stream->substream = ss;

      return 0;
}

static int siu_pcm_close(struct snd_pcm_substream *ss)
{
      struct siu_info *info = siu_i2s_data;
      struct device *dev = ss->pcm->card->dev;
      struct siu_port *port_info = siu_port_info(ss);
      struct siu_stream *siu_stream;

      dev_dbg(dev, "%s: port=%d\n", __func__, info->port_id);

      if (ss->stream == SNDRV_PCM_STREAM_PLAYBACK)
            siu_stream = &port_info->playback;
      else
            siu_stream = &port_info->capture;

      dma_release_channel(siu_stream->chan);
      siu_stream->chan = NULL;

      siu_stream->substream = NULL;

      return 0;
}

static int siu_pcm_prepare(struct snd_pcm_substream *ss)
{
      struct siu_info *info = siu_i2s_data;
      struct siu_port *port_info = siu_port_info(ss);
      struct device *dev = ss->pcm->card->dev;
      struct snd_pcm_runtime  *rt = ss->runtime;
      struct siu_stream *siu_stream;
      snd_pcm_sframes_t xfer_cnt;

      if (ss->stream == SNDRV_PCM_STREAM_PLAYBACK)
            siu_stream = &port_info->playback;
      else
            siu_stream = &port_info->capture;

      rt = siu_stream->substream->runtime;

      siu_stream->buf_bytes = snd_pcm_lib_buffer_bytes(ss);
      siu_stream->period_bytes = snd_pcm_lib_period_bytes(ss);

      dev_dbg(dev, "%s: port=%d, %d channels, period=%u bytes\n", __func__,
            info->port_id, rt->channels, siu_stream->period_bytes);

      /* We only support buffers that are multiples of the period */
      if (siu_stream->buf_bytes % siu_stream->period_bytes) {
            dev_err(dev, "%s() - buffer=%d not multiple of period=%d\n",
                   __func__, siu_stream->buf_bytes,
                   siu_stream->period_bytes);
            return -EINVAL;
      }

      xfer_cnt = bytes_to_frames(rt, siu_stream->period_bytes);
      if (!xfer_cnt || xfer_cnt > 0x1000000)
            return -EINVAL;

      siu_stream->format = rt->format;
      siu_stream->xfer_cnt = xfer_cnt;

      dev_dbg(dev, "port=%d buf=%lx buf_bytes=%d period_bytes=%d "
            "format=%d channels=%d xfer_cnt=%d\n", info->port_id,
            (unsigned long)rt->dma_addr, siu_stream->buf_bytes,
            siu_stream->period_bytes,
            siu_stream->format, rt->channels, (int)xfer_cnt);

      return 0;
}

static int siu_pcm_trigger(struct snd_pcm_substream *ss, int cmd)
{
      struct siu_info *info = siu_i2s_data;
      struct device *dev = ss->pcm->card->dev;
      struct siu_port *port_info = siu_port_info(ss);
      int ret;

      dev_dbg(dev, "%s: port=%d@%p, cmd=%d\n", __func__,
            info->port_id, port_info, cmd);

      switch (cmd) {
      case SNDRV_PCM_TRIGGER_START:
            if (ss->stream == SNDRV_PCM_STREAM_PLAYBACK)
                  ret = siu_pcm_stmwrite_start(port_info);
            else
                  ret = siu_pcm_stmread_start(port_info);

            if (ret < 0)
                  dev_warn(dev, "%s: start failed on port=%d\n",
                         __func__, info->port_id);

            break;
      case SNDRV_PCM_TRIGGER_STOP:
            if (ss->stream == SNDRV_PCM_STREAM_PLAYBACK)
                  siu_pcm_stmwrite_stop(port_info);
            else
                  siu_pcm_stmread_stop(port_info);
            ret = 0;

            break;
      default:
            dev_err(dev, "%s() unsupported cmd=%d\n", __func__, cmd);
            ret = -EINVAL;
      }

      return ret;
}

/*
 * So far only resolution of one period is supported, subject to extending the
 * dmangine API
 */
static snd_pcm_uframes_t siu_pcm_pointer_dma(struct snd_pcm_substream *ss)
{
      struct device *dev = ss->pcm->card->dev;
      struct siu_info *info = siu_i2s_data;
      u32 __iomem *base = info->reg;
      struct siu_port *port_info = siu_port_info(ss);
      struct snd_pcm_runtime *rt = ss->runtime;
      size_t ptr;
      struct siu_stream *siu_stream;

      if (ss->stream == SNDRV_PCM_STREAM_PLAYBACK)
            siu_stream = &port_info->playback;
      else
            siu_stream = &port_info->capture;

      /*
       * ptr is the offset into the buffer where the dma is currently at. We
       * check if the dma buffer has just wrapped.
       */
      ptr = PERIOD_OFFSET(rt->dma_addr,
                      siu_stream->cur_period,
                      siu_stream->period_bytes) - rt->dma_addr;

      dev_dbg(dev,
            "%s: port=%d, events %x, FSTS %x, xferred %u/%u, cookie %d\n",
            __func__, info->port_id, siu_read32(base + SIU_EVNTC),
            siu_read32(base + SIU_SBFSTS), ptr, siu_stream->buf_bytes,
            siu_stream->cookie);

      if (ptr >= siu_stream->buf_bytes)
            ptr = 0;

      return bytes_to_frames(ss->runtime, ptr);
}

static int siu_pcm_new(struct snd_card *card, struct snd_soc_dai *dai,
                   struct snd_pcm *pcm)
{
      /* card->dev == socdev->dev, see snd_soc_new_pcms() */
      struct siu_info *info = siu_i2s_data;
      struct platform_device *pdev = to_platform_device(card->dev);
      int ret;
      int i;

      /* pdev->id selects between SIUA and SIUB */
      if (pdev->id < 0 || pdev->id >= SIU_PORT_NUM)
            return -EINVAL;

      info->port_id = pdev->id;

      /*
       * While the siu has 2 ports, only one port can be on at a time (only 1
       * SPB). So far all the boards using the siu had only one of the ports
       * wired to a codec. To simplify things, we only register one port with
       * alsa. In case both ports are needed, it should be changed here
       */
      for (i = pdev->id; i < pdev->id + 1; i++) {
            struct siu_port **port_info = &siu_ports[i];

            ret = siu_init_port(i, port_info, card);
            if (ret < 0)
                  return ret;

            ret = snd_pcm_lib_preallocate_pages_for_all(pcm,
                        SNDRV_DMA_TYPE_DEV, NULL,
                        SIU_BUFFER_BYTES_MAX, SIU_BUFFER_BYTES_MAX);
            if (ret < 0) {
                  dev_err(card->dev,
                         "snd_pcm_lib_preallocate_pages_for_all() err=%d",
                        ret);
                  goto fail;
            }

            (*port_info)->pcm = pcm;

            /* IO tasklets */
            tasklet_init(&(*port_info)->playback.tasklet, siu_io_tasklet,
                       (unsigned long)&(*port_info)->playback);
            tasklet_init(&(*port_info)->capture.tasklet, siu_io_tasklet,
                       (unsigned long)&(*port_info)->capture);
      }

      dev_info(card->dev, "SuperH SIU driver initialized.\n");
      return 0;

fail:
      siu_free_port(siu_ports[pdev->id]);
      dev_err(card->dev, "SIU: failed to initialize.\n");
      return ret;
}

static void siu_pcm_free(struct snd_pcm *pcm)
{
      struct platform_device *pdev = to_platform_device(pcm->card->dev);
      struct siu_port *port_info = siu_ports[pdev->id];

      tasklet_kill(&port_info->capture.tasklet);
      tasklet_kill(&port_info->playback.tasklet);

      siu_free_port(port_info);
      snd_pcm_lib_preallocate_free_for_all(pcm);

      dev_dbg(pcm->card->dev, "%s\n", __func__);
}

static struct snd_pcm_ops siu_pcm_ops = {
      .open       = siu_pcm_open,
      .close            = siu_pcm_close,
      .ioctl            = snd_pcm_lib_ioctl,
      .hw_params  = siu_pcm_hw_params,
      .hw_free    = siu_pcm_hw_free,
      .prepare    = siu_pcm_prepare,
      .trigger    = siu_pcm_trigger,
      .pointer    = siu_pcm_pointer_dma,
};

struct snd_soc_platform_driver siu_platform = {
      .ops              = &siu_pcm_ops,
      .pcm_new    = siu_pcm_new,
      .pcm_free   = siu_pcm_free,
};
EXPORT_SYMBOL_GPL(siu_platform);

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