ux500_pcm.c

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/*
 * Copyright (C) ST-Ericsson SA 2012
 *
 * Author: Ola Lilja <[email protected]>,
 *         Roger Nilsson <[email protected]>
 *         for ST-Ericsson.
 *
 * License terms:
 *
 * 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 <asm/page.h>

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

#include <plat/ste_dma40.h>

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

#include "ux500_msp_i2s.h"
#include "ux500_pcm.h"

static struct snd_pcm_hardware ux500_pcm_hw_playback = {
    .info = SNDRV_PCM_INFO_INTERLEAVED |
        SNDRV_PCM_INFO_MMAP |
        SNDRV_PCM_INFO_RESUME |
        SNDRV_PCM_INFO_PAUSE,
    .formats = SNDRV_PCM_FMTBIT_S16_LE |
        SNDRV_PCM_FMTBIT_U16_LE |
        SNDRV_PCM_FMTBIT_S16_BE |
        SNDRV_PCM_FMTBIT_U16_BE,
    .rates = SNDRV_PCM_RATE_KNOT,
    .rate_min = UX500_PLATFORM_MIN_RATE_PLAYBACK,
    .rate_max = UX500_PLATFORM_MAX_RATE_PLAYBACK,
    .channels_min = UX500_PLATFORM_MIN_CHANNELS,
    .channels_max = UX500_PLATFORM_MAX_CHANNELS,
    .buffer_bytes_max = UX500_PLATFORM_BUFFER_BYTES_MAX,
    .period_bytes_min = UX500_PLATFORM_PERIODS_BYTES_MIN,
    .period_bytes_max = UX500_PLATFORM_PERIODS_BYTES_MAX,
    .periods_min = UX500_PLATFORM_PERIODS_MIN,
    .periods_max = UX500_PLATFORM_PERIODS_MAX,
};

static struct snd_pcm_hardware ux500_pcm_hw_capture = {
    .info = SNDRV_PCM_INFO_INTERLEAVED |
        SNDRV_PCM_INFO_MMAP |
        SNDRV_PCM_INFO_RESUME |
        SNDRV_PCM_INFO_PAUSE,
    .formats = SNDRV_PCM_FMTBIT_S16_LE |
        SNDRV_PCM_FMTBIT_U16_LE |
        SNDRV_PCM_FMTBIT_S16_BE |
        SNDRV_PCM_FMTBIT_U16_BE,
    .rates = SNDRV_PCM_RATE_KNOT,
    .rate_min = UX500_PLATFORM_MIN_RATE_CAPTURE,
    .rate_max = UX500_PLATFORM_MAX_RATE_CAPTURE,
    .channels_min = UX500_PLATFORM_MIN_CHANNELS,
    .channels_max = UX500_PLATFORM_MAX_CHANNELS,
    .buffer_bytes_max = UX500_PLATFORM_BUFFER_BYTES_MAX,
    .period_bytes_min = UX500_PLATFORM_PERIODS_BYTES_MIN,
    .period_bytes_max = UX500_PLATFORM_PERIODS_BYTES_MAX,
    .periods_min = UX500_PLATFORM_PERIODS_MIN,
    .periods_max = UX500_PLATFORM_PERIODS_MAX,
};

static void ux500_pcm_dma_hw_free(struct device *dev,
                struct snd_pcm_substream *substream)
{
    struct snd_pcm_runtime *runtime = substream->runtime;
    struct snd_dma_buffer *buf = runtime->dma_buffer_p;

    if (runtime->dma_area == NULL)
        return;

    if (buf != &substream->dma_buffer) {
        dma_free_coherent(buf->dev.dev, buf->bytes, buf->area,
                buf->addr);
        kfree(runtime->dma_buffer_p);
    }

    snd_pcm_set_runtime_buffer(substream, NULL);
}

static int ux500_pcm_open(struct snd_pcm_substream *substream)
{
    int stream_id = substream->pstr->stream;
    struct snd_pcm_runtime *runtime = substream->runtime;
    struct snd_soc_pcm_runtime *rtd = substream->private_data;
    struct snd_soc_dai *dai = rtd->cpu_dai;
    struct device *dev = dai->dev;
    int ret;
    struct ux500_msp_dma_params *dma_params;
    u16 per_data_width, mem_data_width;
    struct stedma40_chan_cfg *dma_cfg;

    dev_dbg(dev, "%s: MSP %d (%s): Enter.\n", __func__, dai->id,
        snd_pcm_stream_str(substream));

    dev_dbg(dev, "%s: Set runtime hwparams.\n", __func__);
    if (stream_id == SNDRV_PCM_STREAM_PLAYBACK)
        snd_soc_set_runtime_hwparams(substream,
                    &ux500_pcm_hw_playback);
    else
        snd_soc_set_runtime_hwparams(substream,
                    &ux500_pcm_hw_capture);

    /* ensure that buffer size is a multiple of period size */
    ret = snd_pcm_hw_constraint_integer(runtime,
                    SNDRV_PCM_HW_PARAM_PERIODS);
    if (ret < 0) {
        dev_err(dev, "%s: Error: snd_pcm_hw_constraints failed (%d)\n",
            __func__, ret);
        return ret;
    }

    dev_dbg(dev, "%s: Set hw-struct for %s.\n", __func__,
        snd_pcm_stream_str(substream));
    runtime->hw = (stream_id == SNDRV_PCM_STREAM_PLAYBACK) ?
        ux500_pcm_hw_playback : ux500_pcm_hw_capture;

    mem_data_width = STEDMA40_HALFWORD_WIDTH;

    dma_params = snd_soc_dai_get_dma_data(dai, substream);
    switch (dma_params->data_size) {
    case 32:
        per_data_width = STEDMA40_WORD_WIDTH;
        break;
    case 16:
        per_data_width = STEDMA40_HALFWORD_WIDTH;
        break;
    case 8:
        per_data_width = STEDMA40_BYTE_WIDTH;
        break;
    default:
        per_data_width = STEDMA40_WORD_WIDTH;
        dev_warn(rtd->platform->dev,
            "%s: Unknown data-size (%d)! Assuming 32 bits.\n",
            __func__, dma_params->data_size);
    }

    dma_cfg = dma_params->dma_cfg;

    if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
        dma_cfg->src_info.data_width = mem_data_width;
        dma_cfg->dst_info.data_width = per_data_width;
    } else {
        dma_cfg->src_info.data_width = per_data_width;
        dma_cfg->dst_info.data_width = mem_data_width;
    }


    ret = snd_dmaengine_pcm_open(substream, stedma40_filter, dma_cfg);
    if (ret) {
        dev_dbg(dai->dev,
            "%s: ERROR: snd_dmaengine_pcm_open failed (%d)!\n",
            __func__, ret);
        return ret;
    }

    snd_dmaengine_pcm_set_data(substream, dma_cfg);

    return 0;
}

static int ux500_pcm_close(struct snd_pcm_substream *substream)
{
    struct snd_soc_pcm_runtime *rtd = substream->private_data;
    struct snd_soc_dai *dai = rtd->cpu_dai;

    dev_dbg(dai->dev, "%s: Enter\n", __func__);

    snd_dmaengine_pcm_close(substream);

    return 0;
}

static int ux500_pcm_hw_params(struct snd_pcm_substream *substream,
            struct snd_pcm_hw_params *hw_params)
{
    struct snd_pcm_runtime *runtime = substream->runtime;
    struct snd_dma_buffer *buf = runtime->dma_buffer_p;
    struct snd_soc_pcm_runtime *rtd = substream->private_data;
    int ret = 0;
    int size;

    dev_dbg(rtd->platform->dev, "%s: Enter\n", __func__);

    size = params_buffer_bytes(hw_params);

    if (buf) {
        if (buf->bytes >= size)
            goto out;
        ux500_pcm_dma_hw_free(NULL, substream);
    }

    if (substream->dma_buffer.area != NULL &&
        substream->dma_buffer.bytes >= size) {
        buf = &substream->dma_buffer;
    } else {
        buf = kmalloc(sizeof(struct snd_dma_buffer), GFP_KERNEL);
        if (!buf)
            goto nomem;

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

        if (!buf->area)
            goto free;
    }
    snd_pcm_set_runtime_buffer(substream, buf);
    ret = 1;
 out:
    runtime->dma_bytes = size;
    return ret;

 free:
    kfree(buf);
 nomem:
    return -ENOMEM;
}

static int ux500_pcm_hw_free(struct snd_pcm_substream *substream)
{
    struct snd_soc_pcm_runtime *rtd = substream->private_data;

    dev_dbg(rtd->platform->dev, "%s: Enter\n", __func__);

    ux500_pcm_dma_hw_free(NULL, substream);

    return 0;
}

static int ux500_pcm_mmap(struct snd_pcm_substream *substream,
            struct vm_area_struct *vma)
{
    struct snd_pcm_runtime *runtime = substream->runtime;
    struct snd_soc_pcm_runtime *rtd = substream->private_data;

    dev_dbg(rtd->platform->dev, "%s: Enter.\n", __func__);

    return dma_mmap_coherent(NULL, vma, runtime->dma_area,
                runtime->dma_addr, runtime->dma_bytes);
}

static struct snd_pcm_ops ux500_pcm_ops = {
    .open       = ux500_pcm_open,
    .close      = ux500_pcm_close,
    .ioctl      = snd_pcm_lib_ioctl,
    .hw_params  = ux500_pcm_hw_params,
    .hw_free    = ux500_pcm_hw_free,
    .trigger    = snd_dmaengine_pcm_trigger,
    .pointer    = snd_dmaengine_pcm_pointer_no_residue,
    .mmap       = ux500_pcm_mmap
};

int ux500_pcm_new(struct snd_soc_pcm_runtime *rtd)
{
    struct snd_pcm *pcm = rtd->pcm;

    dev_dbg(rtd->platform->dev, "%s: Enter (id = '%s').\n", __func__,
        pcm->id);

    pcm->info_flags = 0;

    return 0;
}

static struct snd_soc_platform_driver ux500_pcm_soc_drv = {
    .ops        = &ux500_pcm_ops,
    .pcm_new        = ux500_pcm_new,
};

static int __devexit ux500_pcm_drv_probe(struct platform_device *pdev)
{
    int ret;

    ret = snd_soc_register_platform(&pdev->dev, &ux500_pcm_soc_drv);
    if (ret < 0) {
        dev_err(&pdev->dev,
            "%s: ERROR: Failed to register platform '%s' (%d)!\n",
            __func__, pdev->name, ret);
        return ret;
    }

    return 0;
}

static int __devinit ux500_pcm_drv_remove(struct platform_device *pdev)
{
    snd_soc_unregister_platform(&pdev->dev);

    return 0;
}

static struct platform_driver ux500_pcm_driver = {
    .driver = {
        .name = "ux500-pcm",
        .owner = THIS_MODULE,
    },

    .probe = ux500_pcm_drv_probe,
    .remove = __devexit_p(ux500_pcm_drv_remove),
};
module_platform_driver(ux500_pcm_driver);

MODULE_LICENSE("GPL v2");