linux/sound/soc/blackfin/bf5xx-ac97-pcm.c
Lars-Peter Clausen d754fa9ad1 ASoC: blackfin: Don't set unused struct snd_pcm_hardware fields
The ASoC core assumes that the PCM component of the ASoC card transparently
moves data around and does not impose any restrictions on the memory layout or
the transfer speed. It ignores all fields from the snd_pcm_hardware struct for
the PCM driver that are related to this. Setting these fields in the PCM driver
might suggest otherwise though, so rather not set them.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Mark Brown <broonie@linaro.org>
2013-12-23 12:49:36 +00:00

477 lines
14 KiB
C

/*
* File: sound/soc/blackfin/bf5xx-ac97-pcm.c
* Author: Cliff Cai <Cliff.Cai@analog.com>
*
* Created: Tue June 06 2008
* Description: DMA Driver for AC97 sound chip
*
* 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/dma-mapping.h>
#include <linux/gfp.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>
#include <asm/dma.h>
#include "bf5xx-ac97.h"
#include "bf5xx-sport.h"
static unsigned int ac97_chan_mask[] = {
SP_FL, /* Mono */
SP_STEREO, /* Stereo */
SP_2DOT1, /* 2.1*/
SP_QUAD,/*Quadraquic*/
SP_FL | SP_FR | SP_FC | SP_SL | SP_SR,/*5 channels */
SP_5DOT1, /* 5.1 */
};
#if defined(CONFIG_SND_BF5XX_MMAP_SUPPORT)
static void bf5xx_mmap_copy(struct snd_pcm_substream *substream,
snd_pcm_uframes_t count)
{
struct snd_pcm_runtime *runtime = substream->runtime;
struct sport_device *sport = runtime->private_data;
unsigned int chan_mask = ac97_chan_mask[runtime->channels - 1];
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
bf5xx_pcm_to_ac97((struct ac97_frame *)sport->tx_dma_buf +
sport->tx_pos, (__u16 *)runtime->dma_area + sport->tx_pos *
runtime->channels, count, chan_mask);
sport->tx_pos += runtime->period_size;
if (sport->tx_pos >= runtime->buffer_size)
sport->tx_pos %= runtime->buffer_size;
sport->tx_delay_pos = sport->tx_pos;
} else {
bf5xx_ac97_to_pcm((struct ac97_frame *)sport->rx_dma_buf +
sport->rx_pos, (__u16 *)runtime->dma_area + sport->rx_pos *
runtime->channels, count);
sport->rx_pos += runtime->period_size;
if (sport->rx_pos >= runtime->buffer_size)
sport->rx_pos %= runtime->buffer_size;
}
}
#endif
static void bf5xx_dma_irq(void *data)
{
struct snd_pcm_substream *pcm = data;
#if defined(CONFIG_SND_BF5XX_MMAP_SUPPORT)
struct snd_pcm_runtime *runtime = pcm->runtime;
struct sport_device *sport = runtime->private_data;
bf5xx_mmap_copy(pcm, runtime->period_size);
if (pcm->stream == SNDRV_PCM_STREAM_PLAYBACK) {
if (sport->once == 0) {
snd_pcm_period_elapsed(pcm);
bf5xx_mmap_copy(pcm, runtime->period_size);
sport->once = 1;
}
}
#endif
snd_pcm_period_elapsed(pcm);
}
/* The memory size for pure pcm data is 128*1024 = 0x20000 bytes.
* The total rx/tx buffer is for ac97 frame to hold all pcm data
* is 0x20000 * sizeof(struct ac97_frame) / 4.
*/
static const struct snd_pcm_hardware bf5xx_pcm_hardware = {
.info = SNDRV_PCM_INFO_INTERLEAVED |
#if defined(CONFIG_SND_BF5XX_MMAP_SUPPORT)
SNDRV_PCM_INFO_MMAP |
SNDRV_PCM_INFO_MMAP_VALID |
#endif
SNDRV_PCM_INFO_BLOCK_TRANSFER,
.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
* sizeof(struct ac97_frame) / 4;
snd_pcm_lib_malloc_pages(substream, size);
return 0;
}
static int bf5xx_pcm_hw_free(struct snd_pcm_substream *substream)
{
#if defined(CONFIG_SND_BF5XX_MMAP_SUPPORT)
struct snd_pcm_runtime *runtime = substream->runtime;
struct sport_device *sport = runtime->private_data;
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
sport->once = 0;
if (runtime->dma_area)
memset(runtime->dma_area, 0, runtime->buffer_size);
memset(sport->tx_dma_buf, 0, runtime->buffer_size *
sizeof(struct ac97_frame));
} else
memset(sport->rx_dma_buf, 0, runtime->buffer_size *
sizeof(struct ac97_frame));
#endif
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;
/* An intermediate buffer is introduced for implementing mmap for
* SPORT working in TMD mode(include AC97).
*/
#if defined(CONFIG_SND_BF5XX_MMAP_SUPPORT)
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
sport_set_tx_callback(sport, bf5xx_dma_irq, substream);
sport_config_tx_dma(sport, sport->tx_dma_buf, runtime->periods,
runtime->period_size * sizeof(struct ac97_frame));
} else {
sport_set_rx_callback(sport, bf5xx_dma_irq, substream);
sport_config_rx_dma(sport, sport->rx_dma_buf, runtime->periods,
runtime->period_size * sizeof(struct ac97_frame));
}
#else
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,
runtime->period_size * sizeof(struct ac97_frame));
} else {
sport_set_rx_callback(sport, bf5xx_dma_irq, substream);
sport_config_rx_dma(sport, runtime->dma_area, runtime->periods,
runtime->period_size * sizeof(struct ac97_frame));
}
#endif
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) {
#if defined(CONFIG_SND_BF5XX_MMAP_SUPPORT)
bf5xx_mmap_copy(substream, runtime->period_size);
sport->tx_delay_pos = 0;
#endif
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) {
#if defined(CONFIG_SND_BF5XX_MMAP_SUPPORT)
sport->tx_pos = 0;
#endif
sport_tx_stop(sport);
} else {
#if defined(CONFIG_SND_BF5XX_MMAP_SUPPORT)
sport->rx_pos = 0;
#endif
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 curr;
#if defined(CONFIG_SND_BF5XX_MMAP_SUPPORT)
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
curr = sport->tx_delay_pos;
else
curr = sport->rx_pos;
#else
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
curr = sport_curr_offset_tx(sport) / sizeof(struct ac97_frame);
else
curr = sport_curr_offset_rx(sport) / sizeof(struct ac97_frame);
#endif
return curr;
}
static int bf5xx_pcm_open(struct snd_pcm_substream *substream)
{
struct snd_soc_pcm_runtime *rtd = substream->private_data;
struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
struct sport_device *sport_handle = snd_soc_dai_get_drvdata(cpu_dai);
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;
}
#if defined(CONFIG_SND_BF5XX_MMAP_SUPPORT)
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 ;
}
#else
static int bf5xx_pcm_copy(struct snd_pcm_substream *substream, int channel,
snd_pcm_uframes_t pos,
void __user *buf, snd_pcm_uframes_t count)
{
struct snd_pcm_runtime *runtime = substream->runtime;
unsigned int chan_mask = ac97_chan_mask[runtime->channels - 1];
pr_debug("%s copy pos:0x%lx count:0x%lx\n",
substream->stream ? "Capture" : "Playback", pos, count);
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
bf5xx_pcm_to_ac97((struct ac97_frame *)runtime->dma_area + pos,
(__u16 *)buf, count, chan_mask);
else
bf5xx_ac97_to_pcm((struct ac97_frame *)runtime->dma_area + pos,
(__u16 *)buf, count);
return 0;
}
#endif
static struct snd_pcm_ops bf5xx_pcm_ac97_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,
#if defined(CONFIG_SND_BF5XX_MMAP_SUPPORT)
.mmap = bf5xx_pcm_mmap,
#else
.copy = bf5xx_pcm_copy,
#endif
};
static int bf5xx_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream)
{
struct snd_soc_pcm_runtime *rtd = pcm->private_data;
struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
struct sport_device *sport_handle = snd_soc_dai_get_drvdata(cpu_dai);
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
* sizeof(struct ac97_frame) / 4;
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\n");
pr_err("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;
/*
* Need to allocate local buffer when enable
* MMAP for SPORT working in TMD mode (include AC97).
*/
#if defined(CONFIG_SND_BF5XX_MMAP_SUPPORT)
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
if (!sport_handle->tx_dma_buf) {
sport_handle->tx_dma_buf = dma_alloc_coherent(NULL, \
size, &sport_handle->tx_dma_phy, GFP_KERNEL);
if (!sport_handle->tx_dma_buf) {
pr_err("Failed to allocate memory for tx dma buf - Please increase uncached DMA memory region\n");
return -ENOMEM;
} else
memset(sport_handle->tx_dma_buf, 0, size);
} else
memset(sport_handle->tx_dma_buf, 0, size);
} else {
if (!sport_handle->rx_dma_buf) {
sport_handle->rx_dma_buf = dma_alloc_coherent(NULL, \
size, &sport_handle->rx_dma_phy, GFP_KERNEL);
if (!sport_handle->rx_dma_buf) {
pr_err("Failed to allocate memory for rx dma buf - Please increase uncached DMA memory region\n");
return -ENOMEM;
} else
memset(sport_handle->rx_dma_buf, 0, size);
} else
memset(sport_handle->rx_dma_buf, 0, size);
}
#endif
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;
#if defined(CONFIG_SND_BF5XX_MMAP_SUPPORT)
struct snd_soc_pcm_runtime *rtd = pcm->private_data;
struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
struct sport_device *sport_handle = snd_soc_dai_get_drvdata(cpu_dai);
size_t size = bf5xx_pcm_hardware.buffer_bytes_max *
sizeof(struct ac97_frame) / 4;
#endif
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 defined(CONFIG_SND_BF5XX_MMAP_SUPPORT)
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
if (sport_handle->tx_dma_buf)
dma_free_coherent(NULL, size, \
sport_handle->tx_dma_buf, 0);
sport_handle->tx_dma_buf = NULL;
} else {
if (sport_handle->rx_dma_buf)
dma_free_coherent(NULL, size, \
sport_handle->rx_dma_buf, 0);
sport_handle->rx_dma_buf = NULL;
}
#endif
}
}
static int bf5xx_pcm_ac97_new(struct snd_soc_pcm_runtime *rtd)
{
struct snd_card *card = rtd->card->snd_card;
struct snd_pcm *pcm = rtd->pcm;
int ret;
pr_debug("%s enter\n", __func__);
ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32));
if (ret)
return ret;
if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
ret = bf5xx_pcm_preallocate_dma_buffer(pcm,
SNDRV_PCM_STREAM_PLAYBACK);
if (ret)
goto out;
}
if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
ret = bf5xx_pcm_preallocate_dma_buffer(pcm,
SNDRV_PCM_STREAM_CAPTURE);
if (ret)
goto out;
}
out:
return ret;
}
static struct snd_soc_platform_driver bf5xx_ac97_soc_platform = {
.ops = &bf5xx_pcm_ac97_ops,
.pcm_new = bf5xx_pcm_ac97_new,
.pcm_free = bf5xx_pcm_free_dma_buffers,
};
static int bf5xx_soc_platform_probe(struct platform_device *pdev)
{
return snd_soc_register_platform(&pdev->dev, &bf5xx_ac97_soc_platform);
}
static int bf5xx_soc_platform_remove(struct platform_device *pdev)
{
snd_soc_unregister_platform(&pdev->dev);
return 0;
}
static struct platform_driver bf5xx_pcm_driver = {
.driver = {
.name = "bfin-ac97-pcm-audio",
.owner = THIS_MODULE,
},
.probe = bf5xx_soc_platform_probe,
.remove = bf5xx_soc_platform_remove,
};
module_platform_driver(bf5xx_pcm_driver);
MODULE_AUTHOR("Cliff Cai");
MODULE_DESCRIPTION("ADI Blackfin AC97 PCM DMA module");
MODULE_LICENSE("GPL");