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root/sound/soc/blackfin/bf5xx-i2s-pcm.c

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DEFINITIONS

This source file includes following definitions.
  1. bf5xx_dma_irq
  2. bf5xx_pcm_hw_params
  3. bf5xx_pcm_hw_free
  4. bf5xx_pcm_prepare
  5. bf5xx_pcm_trigger
  6. bf5xx_pcm_pointer
  7. bf5xx_pcm_open
  8. bf5xx_pcm_mmap
  9. bf5xx_pcm_preallocate_dma_buffer
  10. bf5xx_pcm_free_dma_buffers
  11. bf5xx_pcm_i2s_new

/*
 * File:         sound/soc/blackfin/bf5xx-i2s-pcm.c
 * Author:       Cliff Cai <Cliff.Cai@analog.com>
 *
 * Created:      Tue June 06 2008
 * Description:  DMA driver for i2s codec
 *
 * Modified:
 *               Copyright 2008 Analog Devices Inc.
 *
 * Bugs:         Enter bugs at http://blackfin.uclinux.org/
 *
 * 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, see the file COPYING, or write
 * to the Free Software Foundation, Inc.,
 * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/platform_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 <asm/dma.h>

#include "bf5xx-i2s-pcm.h"
#include "bf5xx-i2s.h"
#include "bf5xx-sport.h"

static void bf5xx_dma_irq(void *data)
{
        struct snd_pcm_substream *pcm = data;
        snd_pcm_period_elapsed(pcm);
}

static const struct snd_pcm_hardware bf5xx_pcm_hardware = {
        .info                   = SNDRV_PCM_INFO_INTERLEAVED |
                                   SNDRV_PCM_INFO_MMAP |
                                   SNDRV_PCM_INFO_MMAP_VALID |
                                   SNDRV_PCM_INFO_BLOCK_TRANSFER,
        .formats                = SNDRV_PCM_FMTBIT_S16_LE |
                                   SNDRV_PCM_FMTBIT_S24_LE |
                                   SNDRV_PCM_FMTBIT_S32_LE,
        .period_bytes_min       = 32,
        .period_bytes_max       = 0x10000,
        .periods_min            = 1,
        .periods_max            = PAGE_SIZE/32,
        .buffer_bytes_max       = 0x20000, /* 128 kbytes */
        .fifo_size              = 16,
};

static int bf5xx_pcm_hw_params(struct snd_pcm_substream *substream,
        struct snd_pcm_hw_params *params)
{
        size_t size = bf5xx_pcm_hardware.buffer_bytes_max;
        snd_pcm_lib_malloc_pages(substream, size);

        return 0;
}

static int bf5xx_pcm_hw_free(struct snd_pcm_substream *substream)
{
        snd_pcm_lib_free_pages(substream);

        return 0;
}

static int bf5xx_pcm_prepare(struct snd_pcm_substream *substream)
{
        struct snd_pcm_runtime *runtime = substream->runtime;
        struct sport_device *sport = runtime->private_data;
        int period_bytes = frames_to_bytes(runtime, runtime->period_size);

        pr_debug("%s enter\n", __func__);
        if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
                sport_set_tx_callback(sport, bf5xx_dma_irq, substream);
                sport_config_tx_dma(sport, runtime->dma_area,
                        runtime->periods, period_bytes);
        } else {
                sport_set_rx_callback(sport, bf5xx_dma_irq, substream);
                sport_config_rx_dma(sport, runtime->dma_area,
                        runtime->periods, period_bytes);
        }

        return 0;
}

static int bf5xx_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
{
        struct snd_pcm_runtime *runtime = substream->runtime;
        struct sport_device *sport = runtime->private_data;
        int ret = 0;

        pr_debug("%s enter\n", __func__);
        switch (cmd) {
        case SNDRV_PCM_TRIGGER_START:
                if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
                        sport_tx_start(sport);
                else
                        sport_rx_start(sport);
                break;
        case SNDRV_PCM_TRIGGER_STOP:
        case SNDRV_PCM_TRIGGER_SUSPEND:
        case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
                if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
                        sport_tx_stop(sport);
                else
                        sport_rx_stop(sport);
                break;
        default:
                ret = -EINVAL;
        }

        return ret;
}

static snd_pcm_uframes_t bf5xx_pcm_pointer(struct snd_pcm_substream *substream)
{
        struct snd_pcm_runtime *runtime = substream->runtime;
        struct sport_device *sport = runtime->private_data;
        unsigned int diff;
        snd_pcm_uframes_t frames;
        pr_debug("%s enter\n", __func__);
        if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
                diff = sport_curr_offset_tx(sport);
                frames = bytes_to_frames(substream->runtime, diff);
        } else {
                diff = sport_curr_offset_rx(sport);
                frames = bytes_to_frames(substream->runtime, diff);
        }
        return frames;
}

static int bf5xx_pcm_open(struct snd_pcm_substream *substream)
{
        struct snd_pcm_runtime *runtime = substream->runtime;
        int ret;

        pr_debug("%s enter\n", __func__);
        snd_soc_set_runtime_hwparams(substream, &bf5xx_pcm_hardware);

        ret = snd_pcm_hw_constraint_integer(runtime, \
                        SNDRV_PCM_HW_PARAM_PERIODS);
        if (ret < 0)
                goto out;

        if (sport_handle != NULL)
                runtime->private_data = sport_handle;
        else {
                pr_err("sport_handle is NULL\n");
                return -1;
        }
        return 0;

 out:
        return ret;
}

static int bf5xx_pcm_mmap(struct snd_pcm_substream *substream,
        struct vm_area_struct *vma)
{
        struct snd_pcm_runtime *runtime = substream->runtime;
        size_t size = vma->vm_end - vma->vm_start;
        vma->vm_start = (unsigned long)runtime->dma_area;
        vma->vm_end = vma->vm_start + size;
        vma->vm_flags |=  VM_SHARED;

        return 0 ;
}

struct snd_pcm_ops bf5xx_pcm_i2s_ops = {
        .open           = bf5xx_pcm_open,
        .ioctl          = snd_pcm_lib_ioctl,
        .hw_params      = bf5xx_pcm_hw_params,
        .hw_free        = bf5xx_pcm_hw_free,
        .prepare        = bf5xx_pcm_prepare,
        .trigger        = bf5xx_pcm_trigger,
        .pointer        = bf5xx_pcm_pointer,
        .mmap           = bf5xx_pcm_mmap,
};

static int bf5xx_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 = bf5xx_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_coherent(pcm->card->dev, size,
                        &buf->addr, GFP_KERNEL);
        if (!buf->area) {
                pr_err("Failed to allocate dma memory \
                        Please increase uncached DMA memory region\n");
                return -ENOMEM;
        }
        buf->bytes = size;

        pr_debug("%s, area:%p, size:0x%08lx\n", __func__,
                buf->area, buf->bytes);

        if (stream == SNDRV_PCM_STREAM_PLAYBACK)
                sport_handle->tx_buf = buf->area;
        else
                sport_handle->rx_buf = buf->area;

        return 0;
}

static void bf5xx_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_coherent(NULL, buf->bytes, buf->area, 0);
                buf->area = NULL;
        }
        if (sport_handle)
                sport_done(sport_handle);
}

static u64 bf5xx_pcm_dmamask = DMA_32BIT_MASK;

int bf5xx_pcm_i2s_new(struct snd_card *card, struct snd_soc_dai *dai,
        struct snd_pcm *pcm)
{
        int ret = 0;

        pr_debug("%s enter\n", __func__);
        if (!card->dev->dma_mask)
                card->dev->dma_mask = &bf5xx_pcm_dmamask;
        if (!card->dev->coherent_dma_mask)
                card->dev->coherent_dma_mask = DMA_32BIT_MASK;

        if (dai->playback.channels_min) {
                ret = bf5xx_pcm_preallocate_dma_buffer(pcm,
                        SNDRV_PCM_STREAM_PLAYBACK);
                if (ret)
                        goto out;
        }

        if (dai->capture.channels_min) {
                ret = bf5xx_pcm_preallocate_dma_buffer(pcm,
                        SNDRV_PCM_STREAM_CAPTURE);
                if (ret)
                        goto out;
        }
 out:
        return ret;
}

struct snd_soc_platform bf5xx_i2s_soc_platform = {
        .name           = "bf5xx-audio",
        .pcm_ops        = &bf5xx_pcm_i2s_ops,
        .pcm_new        = bf5xx_pcm_i2s_new,
        .pcm_free       = bf5xx_pcm_free_dma_buffers,
};
EXPORT_SYMBOL_GPL(bf5xx_i2s_soc_platform);

MODULE_AUTHOR("Cliff Cai");
MODULE_DESCRIPTION("ADI Blackfin I2S PCM DMA module");
MODULE_LICENSE("GPL");

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