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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/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 <asm/dma.h>
#include <asm/hardware.h>
#include <asm/arch/pxa-regs.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,
.formats = SNDRV_PCM_FMTBIT_S16_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 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 *rtd = runtime->private_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;
snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
runtime->dma_bytes = totsize;
dma_desc = rtd->dma_desc_array;
next_desc_phys = rtd->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 = rtd->params->dev_addr;
} else {
dma_desc->dsadr = rtd->params->dev_addr;
dma_desc->dtadr = dma_buff_phys;
}
if (period > totsize)
period = totsize;
dma_desc->dcmd = rtd->params->dcmd | period | DCMD_ENDIRQEN;
dma_desc++;
dma_buff_phys += period;
} while (totsize -= period);
dma_desc[-1].ddadr = rtd->dma_desc_array_phys;
return 0;
}
static int pxa2xx_pcm_hw_free(struct snd_pcm_substream *substream)
{
struct pxa2xx_runtime_data *rtd = substream->runtime->private_data;
*rtd->params->drcmr = 0;
snd_pcm_set_runtime_buffer(substream, NULL);
return 0;
}
static int pxa2xx_pcm_prepare(struct snd_pcm_substream *substream)
{
struct pxa2xx_pcm_client *client = substream->private_data;
struct snd_pcm_runtime *runtime = substream->runtime;
struct pxa2xx_runtime_data *rtd = runtime->private_data;
DCSR(rtd->dma_ch) &= ~DCSR_RUN;
DCSR(rtd->dma_ch) = 0;
DCMD(rtd->dma_ch) = 0;
*rtd->params->drcmr = rtd->dma_ch | DRCMR_MAPVLD;
return client->prepare(substream);
}
static int pxa2xx_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
{
struct pxa2xx_runtime_data *rtd = substream->runtime->private_data;
int ret = 0;
switch (cmd) {
case SNDRV_PCM_TRIGGER_START:
DDADR(rtd->dma_ch) = rtd->dma_desc_array_phys;
DCSR(rtd->dma_ch) = DCSR_RUN;
break;
case SNDRV_PCM_TRIGGER_STOP:
case SNDRV_PCM_TRIGGER_SUSPEND:
case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
DCSR(rtd->dma_ch) &= ~DCSR_RUN;
break;
case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
DCSR(rtd->dma_ch) |= DCSR_RUN;
break;
default:
ret = -EINVAL;
}
return ret;
}
static void pxa2xx_pcm_dma_irq(int dma_ch, void *dev_id, struct pt_regs *regs)
{
struct snd_pcm_substream *substream = dev_id;
struct pxa2xx_runtime_data *rtd = 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",
rtd->params->name, dma_ch, dcsr );
snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
}
}
static snd_pcm_uframes_t pxa2xx_pcm_pointer(struct snd_pcm_substream *substream)
{
struct snd_pcm_runtime *runtime = substream->runtime;
struct pxa2xx_runtime_data *rtd = runtime->private_data;
dma_addr_t ptr = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
DSADR(rtd->dma_ch) : DTADR(rtd->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_hw_rule_mult32(struct snd_pcm_hw_params *params, struct snd_pcm_hw_rule *rule)
{
struct snd_interval *i = hw_param_interval(params, rule->var);
int changed = 0;
if (i->min & 31) {
i->min = (i->min & ~31) + 32;
i->openmin = 0;
changed = 1;
}
if (i->max & 31) {
i->max &= ~31;
i->openmax = 0;
changed = 1;
}
return changed;
}
static int pxa2xx_pcm_open(struct snd_pcm_substream *substream)
{
struct pxa2xx_pcm_client *client = substream->private_data;
struct snd_pcm_runtime *runtime = substream->runtime;
struct pxa2xx_runtime_data *rtd;
int ret;
runtime->hw = 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_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
pxa2xx_pcm_hw_rule_mult32, NULL,
SNDRV_PCM_HW_PARAM_PERIOD_BYTES, -1);
if (ret)
goto out;
ret = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
pxa2xx_pcm_hw_rule_mult32, NULL,
SNDRV_PCM_HW_PARAM_BUFFER_BYTES, -1);
if (ret)
goto out;
ret = -ENOMEM;
rtd = kmalloc(sizeof(*rtd), GFP_KERNEL);
if (!rtd)
goto out;
rtd->dma_desc_array =
dma_alloc_writecombine(substream->pcm->card->dev, PAGE_SIZE,
&rtd->dma_desc_array_phys, GFP_KERNEL);
if (!rtd->dma_desc_array)
goto err1;
rtd->params = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
client->playback_params : client->capture_params;
ret = pxa_request_dma(rtd->params->name, DMA_PRIO_LOW,
pxa2xx_pcm_dma_irq, substream);
if (ret < 0)
goto err2;
rtd->dma_ch = ret;
runtime->private_data = rtd;
ret = client->startup(substream);
if (!ret)
goto out;
pxa_free_dma(rtd->dma_ch);
err2:
dma_free_writecombine(substream->pcm->card->dev, PAGE_SIZE,
rtd->dma_desc_array, rtd->dma_desc_array_phys);
err1:
kfree(rtd);
out:
return ret;
}
static int <
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