mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-26 19:00:25 +00:00
[ALSA] ASoC pxa2xx DMA support
This patch adds pxa2xx ASoC DMA audio support. It's based on sound/arm/pxa-pcm.c by Nicolas Pitre with the following differences. o Modified driver structure to use ASoC core PCM callbacks and data structures. o Registration with ASoC core. From: Liam Girdwood <liam.girdwood@wolfsonmicro.com> Signed-off-by: Nicolas Pitre <nico@cam.org> Signed-off-by: Richard Purdie <rpurdie@rpsys.net> Signed-off-by: Liam Girdwood <liam.girdwood@wolfsonmicro.com> Signed-off-by: Takashi Iwai <tiwai@suse.de> Signed-off-by: Jaroslav Kysela <perex@suse.cz>
This commit is contained in:
parent
102fa9060e
commit
f11a96d5cd
2 changed files with 411 additions and 0 deletions
363
sound/soc/pxa/pxa2xx-pcm.c
Normal file
363
sound/soc/pxa/pxa2xx-pcm.c
Normal file
|
@ -0,0 +1,363 @@
|
|||
/*
|
||||
* linux/sound/arm/pxa2xx-pcm.c -- ALSA PCM interface for the Intel PXA2xx chip
|
||||
*
|
||||
* Author: Nicolas Pitre
|
||||
* Created: Nov 30, 2004
|
||||
* Copyright: (C) 2004 MontaVista Software, 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.
|
||||
*/
|
||||
|
||||
#include <linux/module.h>
|
||||
#include <linux/init.h>
|
||||
#include <linux/platform_device.h>
|
||||
#include <linux/slab.h>
|
||||
#include <linux/dma-mapping.h>
|
||||
|
||||
#include <sound/driver.h>
|
||||
#include <sound/core.h>
|
||||
#include <sound/pcm.h>
|
||||
#include <sound/pcm_params.h>
|
||||
#include <sound/soc.h>
|
||||
|
||||
#include <asm/dma.h>
|
||||
#include <asm/hardware.h>
|
||||
#include <asm/arch/pxa-regs.h>
|
||||
#include <asm/arch/audio.h>
|
||||
|
||||
#include "pxa2xx-pcm.h"
|
||||
|
||||
static const struct snd_pcm_hardware pxa2xx_pcm_hardware = {
|
||||
.info = SNDRV_PCM_INFO_MMAP |
|
||||
SNDRV_PCM_INFO_MMAP_VALID |
|
||||
SNDRV_PCM_INFO_INTERLEAVED |
|
||||
SNDRV_PCM_INFO_PAUSE |
|
||||
SNDRV_PCM_INFO_RESUME,
|
||||
.formats = SNDRV_PCM_FMTBIT_S16_LE |
|
||||
SNDRV_PCM_FMTBIT_S24_LE |
|
||||
SNDRV_PCM_FMTBIT_S32_LE,
|
||||
.period_bytes_min = 32,
|
||||
.period_bytes_max = 8192 - 32,
|
||||
.periods_min = 1,
|
||||
.periods_max = PAGE_SIZE/sizeof(pxa_dma_desc),
|
||||
.buffer_bytes_max = 128 * 1024,
|
||||
.fifo_size = 32,
|
||||
};
|
||||
|
||||
struct pxa2xx_runtime_data {
|
||||
int dma_ch;
|
||||
struct pxa2xx_pcm_dma_params *params;
|
||||
pxa_dma_desc *dma_desc_array;
|
||||
dma_addr_t dma_desc_array_phys;
|
||||
};
|
||||
|
||||
static void pxa2xx_pcm_dma_irq(int dma_ch, void *dev_id)
|
||||
{
|
||||
struct snd_pcm_substream *substream = dev_id;
|
||||
struct pxa2xx_runtime_data *prtd = substream->runtime->private_data;
|
||||
int dcsr;
|
||||
|
||||
dcsr = DCSR(dma_ch);
|
||||
DCSR(dma_ch) = dcsr & ~DCSR_STOPIRQEN;
|
||||
|
||||
if (dcsr & DCSR_ENDINTR) {
|
||||
snd_pcm_period_elapsed(substream);
|
||||
} else {
|
||||
printk( KERN_ERR "%s: DMA error on channel %d (DCSR=%#x)\n",
|
||||
prtd->params->name, dma_ch, dcsr );
|
||||
}
|
||||
}
|
||||
|
||||
static int pxa2xx_pcm_hw_params(struct snd_pcm_substream *substream,
|
||||
struct snd_pcm_hw_params *params)
|
||||
{
|
||||
struct snd_pcm_runtime *runtime = substream->runtime;
|
||||
struct pxa2xx_runtime_data *prtd = runtime->private_data;
|
||||
struct snd_soc_pcm_runtime *rtd = substream->private_data;
|
||||
struct pxa2xx_pcm_dma_params *dma = rtd->cpu_dai->dma_data;
|
||||
size_t totsize = params_buffer_bytes(params);
|
||||
size_t period = params_period_bytes(params);
|
||||
pxa_dma_desc *dma_desc;
|
||||
dma_addr_t dma_buff_phys, next_desc_phys;
|
||||
int ret;
|
||||
|
||||
/* this may get called several times by oss emulation
|
||||
* with different params */
|
||||
if (prtd->params == NULL) {
|
||||
prtd->params = dma;
|
||||
ret = pxa_request_dma(prtd->params->name, DMA_PRIO_LOW,
|
||||
pxa2xx_pcm_dma_irq, substream);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
prtd->dma_ch = ret;
|
||||
} else if (prtd->params != dma) {
|
||||
pxa_free_dma(prtd->dma_ch);
|
||||
prtd->params = dma;
|
||||
ret = pxa_request_dma(prtd->params->name, DMA_PRIO_LOW,
|
||||
pxa2xx_pcm_dma_irq, substream);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
prtd->dma_ch = ret;
|
||||
}
|
||||
|
||||
snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
|
||||
runtime->dma_bytes = totsize;
|
||||
|
||||
dma_desc = prtd->dma_desc_array;
|
||||
next_desc_phys = prtd->dma_desc_array_phys;
|
||||
dma_buff_phys = runtime->dma_addr;
|
||||
do {
|
||||
next_desc_phys += sizeof(pxa_dma_desc);
|
||||
dma_desc->ddadr = next_desc_phys;
|
||||
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
|
||||
dma_desc->dsadr = dma_buff_phys;
|
||||
dma_desc->dtadr = prtd->params->dev_addr;
|
||||
} else {
|
||||
dma_desc->dsadr = prtd->params->dev_addr;
|
||||
dma_desc->dtadr = dma_buff_phys;
|
||||
}
|
||||
if (period > totsize)
|
||||
period = totsize;
|
||||
dma_desc->dcmd = prtd->params->dcmd | period | DCMD_ENDIRQEN;
|
||||
dma_desc++;
|
||||
dma_buff_phys += period;
|
||||
} while (totsize -= period);
|
||||
dma_desc[-1].ddadr = prtd->dma_desc_array_phys;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int pxa2xx_pcm_hw_free(struct snd_pcm_substream *substream)
|
||||
{
|
||||
struct pxa2xx_runtime_data *prtd = substream->runtime->private_data;
|
||||
|
||||
if (prtd && prtd->params)
|
||||
*prtd->params->drcmr = 0;
|
||||
|
||||
if (prtd->dma_ch) {
|
||||
snd_pcm_set_runtime_buffer(substream, NULL);
|
||||
pxa_free_dma(prtd->dma_ch);
|
||||
prtd->dma_ch = 0;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int pxa2xx_pcm_prepare(struct snd_pcm_substream *substream)
|
||||
{
|
||||
struct pxa2xx_runtime_data *prtd = substream->runtime->private_data;
|
||||
|
||||
DCSR(prtd->dma_ch) &= ~DCSR_RUN;
|
||||
DCSR(prtd->dma_ch) = 0;
|
||||
DCMD(prtd->dma_ch) = 0;
|
||||
*prtd->params->drcmr = prtd->dma_ch | DRCMR_MAPVLD;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int pxa2xx_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
|
||||
{
|
||||
struct pxa2xx_runtime_data *prtd = substream->runtime->private_data;
|
||||
int ret = 0;
|
||||
|
||||
switch (cmd) {
|
||||
case SNDRV_PCM_TRIGGER_START:
|
||||
DDADR(prtd->dma_ch) = prtd->dma_desc_array_phys;
|
||||
DCSR(prtd->dma_ch) = DCSR_RUN;
|
||||
break;
|
||||
|
||||
case SNDRV_PCM_TRIGGER_STOP:
|
||||
case SNDRV_PCM_TRIGGER_SUSPEND:
|
||||
case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
|
||||
DCSR(prtd->dma_ch) &= ~DCSR_RUN;
|
||||
break;
|
||||
|
||||
case SNDRV_PCM_TRIGGER_RESUME:
|
||||
DCSR(prtd->dma_ch) |= DCSR_RUN;
|
||||
break;
|
||||
case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
|
||||
DDADR(prtd->dma_ch) = prtd->dma_desc_array_phys;
|
||||
DCSR(prtd->dma_ch) |= DCSR_RUN;
|
||||
break;
|
||||
|
||||
default:
|
||||
ret = -EINVAL;
|
||||
}
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static snd_pcm_uframes_t
|
||||
pxa2xx_pcm_pointer(struct snd_pcm_substream *substream)
|
||||
{
|
||||
struct snd_pcm_runtime *runtime = substream->runtime;
|
||||
struct pxa2xx_runtime_data *prtd = runtime->private_data;
|
||||
|
||||
dma_addr_t ptr = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
|
||||
DSADR(prtd->dma_ch) : DTADR(prtd->dma_ch);
|
||||
snd_pcm_uframes_t x = bytes_to_frames(runtime, ptr - runtime->dma_addr);
|
||||
|
||||
if (x == runtime->buffer_size)
|
||||
x = 0;
|
||||
return x;
|
||||
}
|
||||
|
||||
static int pxa2xx_pcm_open(struct snd_pcm_substream *substream)
|
||||
{
|
||||
struct snd_pcm_runtime *runtime = substream->runtime;
|
||||
struct pxa2xx_runtime_data *prtd;
|
||||
int ret;
|
||||
|
||||
snd_soc_set_runtime_hwparams(substream, &pxa2xx_pcm_hardware);
|
||||
|
||||
/*
|
||||
* For mysterious reasons (and despite what the manual says)
|
||||
* playback samples are lost if the DMA count is not a multiple
|
||||
* of the DMA burst size. Let's add a rule to enforce that.
|
||||
*/
|
||||
ret = snd_pcm_hw_constraint_step(runtime, 0,
|
||||
SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 32);
|
||||
if (ret)
|
||||
goto out;
|
||||
|
||||
ret = snd_pcm_hw_constraint_step(runtime, 0,
|
||||
SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 32);
|
||||
if (ret)
|
||||
goto out;
|
||||
|
||||
prtd = kzalloc(sizeof(struct pxa2xx_runtime_data), GFP_KERNEL);
|
||||
if (prtd == NULL) {
|
||||
ret = -ENOMEM;
|
||||
goto out;
|
||||
}
|
||||
|
||||
prtd->dma_desc_array =
|
||||
dma_alloc_writecombine(substream->pcm->card->dev, PAGE_SIZE,
|
||||
&prtd->dma_desc_array_phys, GFP_KERNEL);
|
||||
if (!prtd->dma_desc_array) {
|
||||
ret = -ENOMEM;
|
||||
goto err1;
|
||||
}
|
||||
|
||||
runtime->private_data = prtd;
|
||||
return 0;
|
||||
|
||||
err1:
|
||||
kfree(prtd);
|
||||
out:
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int pxa2xx_pcm_close(struct snd_pcm_substream *substream)
|
||||
{
|
||||
struct snd_pcm_runtime *runtime = substream->runtime;
|
||||
struct pxa2xx_runtime_data *prtd = runtime->private_data;
|
||||
|
||||
dma_free_writecombine(substream->pcm->card->dev, PAGE_SIZE,
|
||||
prtd->dma_desc_array, prtd->dma_desc_array_phys);
|
||||
kfree(prtd);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int pxa2xx_pcm_mmap(struct snd_pcm_substream *substream,
|
||||
struct vm_area_struct *vma)
|
||||
{
|
||||
struct snd_pcm_runtime *runtime = substream->runtime;
|
||||
return dma_mmap_writecombine(substream->pcm->card->dev, vma,
|
||||
runtime->dma_area,
|
||||
runtime->dma_addr,
|
||||
runtime->dma_bytes);
|
||||
}
|
||||
|
||||
struct snd_pcm_ops pxa2xx_pcm_ops = {
|
||||
.open = pxa2xx_pcm_open,
|
||||
.close = pxa2xx_pcm_close,
|
||||
.ioctl = snd_pcm_lib_ioctl,
|
||||
.hw_params = pxa2xx_pcm_hw_params,
|
||||
.hw_free = pxa2xx_pcm_hw_free,
|
||||
.prepare = pxa2xx_pcm_prepare,
|
||||
.trigger = pxa2xx_pcm_trigger,
|
||||
.pointer = pxa2xx_pcm_pointer,
|
||||
.mmap = pxa2xx_pcm_mmap,
|
||||
};
|
||||
|
||||
static int pxa2xx_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 = pxa2xx_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_writecombine(pcm->card->dev, size,
|
||||
&buf->addr, GFP_KERNEL);
|
||||
if (!buf->area)
|
||||
return -ENOMEM;
|
||||
buf->bytes = size;
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void pxa2xx_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_writecombine(pcm->card->dev, buf->bytes,
|
||||
buf->area, buf->addr);
|
||||
buf->area = NULL;
|
||||
}
|
||||
}
|
||||
|
||||
static u64 pxa2xx_pcm_dmamask = DMA_32BIT_MASK;
|
||||
|
||||
int pxa2xx_pcm_new(struct snd_card *card, struct snd_soc_codec_dai *dai,
|
||||
struct snd_pcm *pcm)
|
||||
{
|
||||
int ret = 0;
|
||||
|
||||
if (!card->dev->dma_mask)
|
||||
card->dev->dma_mask = &pxa2xx_pcm_dmamask;
|
||||
if (!card->dev->coherent_dma_mask)
|
||||
card->dev->coherent_dma_mask = DMA_32BIT_MASK;
|
||||
|
||||
if (dai->playback.channels_min) {
|
||||
ret = pxa2xx_pcm_preallocate_dma_buffer(pcm,
|
||||
SNDRV_PCM_STREAM_PLAYBACK);
|
||||
if (ret)
|
||||
goto out;
|
||||
}
|
||||
|
||||
if (dai->capture.channels_min) {
|
||||
ret = pxa2xx_pcm_preallocate_dma_buffer(pcm,
|
||||
SNDRV_PCM_STREAM_CAPTURE);
|
||||
if (ret)
|
||||
goto out;
|
||||
}
|
||||
out:
|
||||
return ret;
|
||||
}
|
||||
|
||||
struct snd_soc_platform pxa2xx_soc_platform = {
|
||||
.name = "pxa2xx-audio",
|
||||
.pcm_ops = &pxa2xx_pcm_ops,
|
||||
.pcm_new = pxa2xx_pcm_new,
|
||||
.pcm_free = pxa2xx_pcm_free_dma_buffers,
|
||||
};
|
||||
|
||||
EXPORT_SYMBOL_GPL(pxa2xx_soc_platform);
|
||||
|
||||
MODULE_AUTHOR("Nicolas Pitre");
|
||||
MODULE_DESCRIPTION("Intel PXA2xx PCM DMA module");
|
||||
MODULE_LICENSE("GPL");
|
48
sound/soc/pxa/pxa2xx-pcm.h
Normal file
48
sound/soc/pxa/pxa2xx-pcm.h
Normal file
|
@ -0,0 +1,48 @@
|
|||
/*
|
||||
* linux/sound/arm/pxa2xx-pcm.h -- ALSA PCM interface for the Intel PXA2xx chip
|
||||
*
|
||||
* Author: Nicolas Pitre
|
||||
* Created: Nov 30, 2004
|
||||
* Copyright: MontaVista Software, 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 _PXA2XX_PCM_H
|
||||
#define _PXA2XX_PCM_H
|
||||
|
||||
struct pxa2xx_pcm_dma_params {
|
||||
char *name; /* stream identifier */
|
||||
u32 dcmd; /* DMA descriptor dcmd field */
|
||||
volatile u32 *drcmr; /* the DMA request channel to use */
|
||||
u32 dev_addr; /* device physical address for DMA */
|
||||
};
|
||||
|
||||
struct pxa2xx_gpio {
|
||||
u32 sys;
|
||||
u32 rx;
|
||||
u32 tx;
|
||||
u32 clk;
|
||||
u32 frm;
|
||||
};
|
||||
|
||||
/* pxa2xx DAI ID's */
|
||||
#define PXA2XX_DAI_AC97_HIFI 0
|
||||
#define PXA2XX_DAI_AC97_AUX 1
|
||||
#define PXA2XX_DAI_AC97_MIC 2
|
||||
#define PXA2XX_DAI_I2S 0
|
||||
#define PXA2XX_DAI_SSP1 0
|
||||
#define PXA2XX_DAI_SSP2 1
|
||||
#define PXA2XX_DAI_SSP3 2
|
||||
|
||||
extern struct snd_soc_cpu_dai pxa_ac97_dai[3];
|
||||
extern struct snd_soc_cpu_dai pxa_i2s_dai;
|
||||
extern struct snd_soc_cpu_dai pxa_ssp_dai[3];
|
||||
|
||||
/* platform data */
|
||||
extern struct snd_soc_platform pxa2xx_soc_platform;
|
||||
extern struct snd_ac97_bus_ops pxa2xx_ac97_ops;
|
||||
|
||||
#endif
|
Loading…
Reference in a new issue