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sound: ASoC: Blackfin: DMA Driver for I2S sound chip
Signed-off-by: Cliff Cai <cliff.cai@analog.com> Signed-off-by: Bryan Wu <cooloney@kernel.org> Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com> Signed-off-by: Jaroslav Kysela <perex@perex.cz>
This commit is contained in:
Cliff Cai
Jaroslav Kysela
parent
f2028623f2
commit
88740da15c
2 changed files with 317 additions and 0 deletions
288
sound/soc/blackfin/bf5xx-i2s-pcm.c
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288
sound/soc/blackfin/bf5xx-i2s-pcm.c
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@ -0,0 +1,288 @@
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/*
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* File: sound/soc/blackfin/bf5xx-i2s-pcm.c
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* Author: Cliff Cai <Cliff.Cai@analog.com>
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*
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* Created: Tue June 06 2008
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* Description: DMA driver for i2s codec
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*
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* Modified:
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* Copyright 2008 Analog Devices Inc.
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*
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* Bugs: Enter bugs at http://blackfin.uclinux.org/
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see the file COPYING, or write
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* to the Free Software Foundation, Inc.,
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* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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#include <linux/dma-mapping.h>
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#include <sound/core.h>
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#include <sound/pcm.h>
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#include <sound/pcm_params.h>
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#include <sound/soc.h>
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#include <asm/dma.h>
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#include "bf5xx-i2s-pcm.h"
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#include "bf5xx-i2s.h"
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#include "bf5xx-sport.h"
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static void bf5xx_dma_irq(void *data)
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{
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struct snd_pcm_substream *pcm = data;
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snd_pcm_period_elapsed(pcm);
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}
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static const struct snd_pcm_hardware bf5xx_pcm_hardware = {
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.info = SNDRV_PCM_INFO_INTERLEAVED |
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SNDRV_PCM_INFO_MMAP |
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SNDRV_PCM_INFO_MMAP_VALID |
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SNDRV_PCM_INFO_BLOCK_TRANSFER,
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.formats = SNDRV_PCM_FMTBIT_S16_LE |
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SNDRV_PCM_FMTBIT_S24_LE |
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SNDRV_PCM_FMTBIT_S32_LE,
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.period_bytes_min = 32,
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.period_bytes_max = 0x10000,
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.periods_min = 1,
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.periods_max = PAGE_SIZE/32,
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.buffer_bytes_max = 0x20000, /* 128 kbytes */
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.fifo_size = 16,
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};
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static int bf5xx_pcm_hw_params(struct snd_pcm_substream *substream,
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struct snd_pcm_hw_params *params)
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{
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size_t size = bf5xx_pcm_hardware.buffer_bytes_max;
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snd_pcm_lib_malloc_pages(substream, size);
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return 0;
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}
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static int bf5xx_pcm_hw_free(struct snd_pcm_substream *substream)
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{
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snd_pcm_lib_free_pages(substream);
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return 0;
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}
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static int bf5xx_pcm_prepare(struct snd_pcm_substream *substream)
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{
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struct snd_pcm_runtime *runtime = substream->runtime;
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struct sport_device *sport = runtime->private_data;
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int period_bytes = frames_to_bytes(runtime, runtime->period_size);
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pr_debug("%s enter\n", __func__);
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if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
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sport_set_tx_callback(sport, bf5xx_dma_irq, substream);
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sport_config_tx_dma(sport, runtime->dma_area,
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runtime->periods, period_bytes);
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} else {
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sport_set_rx_callback(sport, bf5xx_dma_irq, substream);
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sport_config_rx_dma(sport, runtime->dma_area,
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runtime->periods, period_bytes);
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}
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return 0;
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}
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static int bf5xx_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
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{
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struct snd_pcm_runtime *runtime = substream->runtime;
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struct sport_device *sport = runtime->private_data;
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int ret = 0;
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pr_debug("%s enter\n", __func__);
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switch (cmd) {
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case SNDRV_PCM_TRIGGER_START:
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if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
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sport_tx_start(sport);
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else
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sport_rx_start(sport);
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break;
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case SNDRV_PCM_TRIGGER_STOP:
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case SNDRV_PCM_TRIGGER_SUSPEND:
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case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
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if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
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sport_tx_stop(sport);
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else
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sport_rx_stop(sport);
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break;
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default:
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ret = -EINVAL;
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}
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return ret;
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}
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static snd_pcm_uframes_t bf5xx_pcm_pointer(struct snd_pcm_substream *substream)
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{
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struct snd_pcm_runtime *runtime = substream->runtime;
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struct sport_device *sport = runtime->private_data;
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unsigned int diff;
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snd_pcm_uframes_t frames;
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pr_debug("%s enter\n", __func__);
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if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
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diff = sport_curr_offset_tx(sport);
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frames = bytes_to_frames(substream->runtime, diff);
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} else {
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diff = sport_curr_offset_rx(sport);
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frames = bytes_to_frames(substream->runtime, diff);
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}
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return frames;
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}
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static int bf5xx_pcm_open(struct snd_pcm_substream *substream)
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{
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struct snd_pcm_runtime *runtime = substream->runtime;
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int ret;
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pr_debug("%s enter\n", __func__);
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snd_soc_set_runtime_hwparams(substream, &bf5xx_pcm_hardware);
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ret = snd_pcm_hw_constraint_integer(runtime, \
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SNDRV_PCM_HW_PARAM_PERIODS);
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if (ret < 0)
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goto out;
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if (sport_handle != NULL)
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runtime->private_data = sport_handle;
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else {
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pr_err("sport_handle is NULL\n");
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return -1;
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}
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return 0;
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out:
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return ret;
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}
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static int bf5xx_pcm_mmap(struct snd_pcm_substream *substream,
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struct vm_area_struct *vma)
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{
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struct snd_pcm_runtime *runtime = substream->runtime;
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size_t size = vma->vm_end - vma->vm_start;
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vma->vm_start = (unsigned long)runtime->dma_area;
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vma->vm_end = vma->vm_start + size;
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vma->vm_flags |= VM_SHARED;
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return 0 ;
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}
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struct snd_pcm_ops bf5xx_pcm_i2s_ops = {
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.open = bf5xx_pcm_open,
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.ioctl = snd_pcm_lib_ioctl,
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.hw_params = bf5xx_pcm_hw_params,
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.hw_free = bf5xx_pcm_hw_free,
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.prepare = bf5xx_pcm_prepare,
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.trigger = bf5xx_pcm_trigger,
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.pointer = bf5xx_pcm_pointer,
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.mmap = bf5xx_pcm_mmap,
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};
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static int bf5xx_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream)
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{
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struct snd_pcm_substream *substream = pcm->streams[stream].substream;
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struct snd_dma_buffer *buf = &substream->dma_buffer;
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size_t size = bf5xx_pcm_hardware.buffer_bytes_max;
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buf->dev.type = SNDRV_DMA_TYPE_DEV;
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buf->dev.dev = pcm->card->dev;
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buf->private_data = NULL;
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buf->area = dma_alloc_coherent(pcm->card->dev, size,
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&buf->addr, GFP_KERNEL);
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if (!buf->area) {
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pr_err("Failed to allocate dma memory \
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Please increase uncached DMA memory region\n");
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return -ENOMEM;
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}
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buf->bytes = size;
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pr_debug("%s, area:%p, size:0x%08lx\n", __func__,
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buf->area, buf->bytes);
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if (stream == SNDRV_PCM_STREAM_PLAYBACK)
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sport_handle->tx_buf = buf->area;
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else
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sport_handle->rx_buf = buf->area;
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return 0;
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}
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static void bf5xx_pcm_free_dma_buffers(struct snd_pcm *pcm)
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{
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struct snd_pcm_substream *substream;
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struct snd_dma_buffer *buf;
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int stream;
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for (stream = 0; stream < 2; stream++) {
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substream = pcm->streams[stream].substream;
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if (!substream)
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continue;
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buf = &substream->dma_buffer;
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if (!buf->area)
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continue;
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dma_free_coherent(NULL, buf->bytes, buf->area, 0);
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buf->area = NULL;
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}
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if (sport_handle)
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sport_done(sport_handle);
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}
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static u64 bf5xx_pcm_dmamask = DMA_32BIT_MASK;
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int bf5xx_pcm_i2s_new(struct snd_card *card, struct snd_soc_dai *dai,
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struct snd_pcm *pcm)
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{
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int ret = 0;
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pr_debug("%s enter\n", __func__);
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if (!card->dev->dma_mask)
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card->dev->dma_mask = &bf5xx_pcm_dmamask;
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if (!card->dev->coherent_dma_mask)
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card->dev->coherent_dma_mask = DMA_32BIT_MASK;
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if (dai->playback.channels_min) {
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ret = bf5xx_pcm_preallocate_dma_buffer(pcm,
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SNDRV_PCM_STREAM_PLAYBACK);
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if (ret)
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goto out;
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}
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if (dai->capture.channels_min) {
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ret = bf5xx_pcm_preallocate_dma_buffer(pcm,
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SNDRV_PCM_STREAM_CAPTURE);
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if (ret)
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goto out;
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}
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out:
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return ret;
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}
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struct snd_soc_platform bf5xx_i2s_soc_platform = {
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.name = "bf5xx-audio",
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.pcm_ops = &bf5xx_pcm_i2s_ops,
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.pcm_new = bf5xx_pcm_i2s_new,
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.pcm_free = bf5xx_pcm_free_dma_buffers,
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};
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EXPORT_SYMBOL_GPL(bf5xx_i2s_soc_platform);
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MODULE_AUTHOR("Cliff Cai");
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MODULE_DESCRIPTION("ADI Blackfin I2S PCM DMA module");
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MODULE_LICENSE("GPL");
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29
sound/soc/blackfin/bf5xx-i2s-pcm.h
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29
sound/soc/blackfin/bf5xx-i2s-pcm.h
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@ -0,0 +1,29 @@
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/*
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* linux/sound/arm/bf5xx-i2s-pcm.h -- ALSA PCM interface for the Blackfin
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*
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* Copyright 2007 Analog Device Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#ifndef _BF5XX_I2S_PCM_H
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#define _BF5XX_I2S_PCM_H
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struct bf5xx_pcm_dma_params {
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char *name; /* stream identifier */
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};
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struct bf5xx_gpio {
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u32 sys;
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u32 rx;
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u32 tx;
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u32 clk;
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u32 frm;
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};
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/* platform data */
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extern struct snd_soc_platform bf5xx_i2s_soc_platform;
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#endif
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