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r: 47066
b: refs/heads/master
c: f11a96d
h: refs/heads/master
v: v3
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Liam Girdwood authored and Jaroslav Kysela committed Feb 9, 2007
1 parent 89b13e7 commit 72c6bbd
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2 changes: 1 addition & 1 deletion [refs]
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---
refs/heads/master: 102fa9060e114a53628a6594034b6ecf624dffc6
refs/heads/master: f11a96d5cd94202479e603f9dfaff6e92f342135
363 changes: 363 additions & 0 deletions trunk/sound/soc/pxa/pxa2xx-pcm.c
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/*
* 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");
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