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    Subject[PATCH 6/9] ASoC: Blackfin: DMA Driver for I2S sound chip
    Date
    From: Cliff Cai <cliff.cai@analog.com>

    Signed-off-by: Cliff Cai <cliff.cai@analog.com>
    Signed-off-by: Bryan Wu <cooloney@kernel.org>
    ---
    sound/soc/blackfin/bf5xx-i2s-pcm.c | 288 ++++++++++++++++++++++++++++++++++++
    sound/soc/blackfin/bf5xx-i2s-pcm.h | 29 ++++
    2 files changed, 317 insertions(+), 0 deletions(-)
    create mode 100644 sound/soc/blackfin/bf5xx-i2s-pcm.c
    create mode 100644 sound/soc/blackfin/bf5xx-i2s-pcm.h

    diff --git a/sound/soc/blackfin/bf5xx-i2s-pcm.c b/sound/soc/blackfin/bf5xx-i2s-pcm.c
    new file mode 100644
    index 0000000..61fccf9
    --- /dev/null
    +++ b/sound/soc/blackfin/bf5xx-i2s-pcm.c
    @@ -0,0 +1,288 @@
    +/*
    + * 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");
    diff --git a/sound/soc/blackfin/bf5xx-i2s-pcm.h b/sound/soc/blackfin/bf5xx-i2s-pcm.h
    new file mode 100644
    index 0000000..4d4609a
    --- /dev/null
    +++ b/sound/soc/blackfin/bf5xx-i2s-pcm.h
    @@ -0,0 +1,29 @@
    +/*
    + * linux/sound/arm/bf5xx-i2s-pcm.h -- ALSA PCM interface for the Blackfin
    + *
    + * Copyright 2007 Analog Device Inc.
    + *
    + * 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.
    + */
    +
    +#ifndef _BF5XX_I2S_PCM_H
    +#define _BF5XX_I2S_PCM_H
    +
    +struct bf5xx_pcm_dma_params {
    + char *name; /* stream identifier */
    +};
    +
    +struct bf5xx_gpio {
    + u32 sys;
    + u32 rx;
    + u32 tx;
    + u32 clk;
    + u32 frm;
    +};
    +
    +/* platform data */
    +extern struct snd_soc_platform bf5xx_i2s_soc_platform;
    +
    +#endif
    --
    1.5.6

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