/*
* Generic TXx9 ACLC platform driver
*
* Copyright (C) 2009 Atsushi Nemoto
*
* Based on RBTX49xx patch from CELF patch archive.
* (C) Copyright TOSHIBA CORPORATION 2004-2006
*
* 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/scatterlist.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>
#include "txx9aclc.h"
static const struct snd_pcm_hardware txx9aclc_pcm_hardware = {
/*
* REVISIT: SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID
* needs more works for noncoherent MIPS.
*/
.info = SNDRV_PCM_INFO_INTERLEAVED |
SNDRV_PCM_INFO_BATCH |
SNDRV_PCM_INFO_PAUSE,
#ifdef __BIG_ENDIAN
.formats = SNDRV_PCM_FMTBIT_S16_BE,
#else
.formats = SNDRV_PCM_FMTBIT_S16_LE,
#endif
.period_bytes_min = 1024,
.period_bytes_max = 8 * 1024,
.periods_min = 2,
.periods_max = 4096,
.buffer_bytes_max = 32 * 1024,
};
static int txx9aclc_pcm_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *params)
{
struct snd_soc_pcm_runtime *rtd = snd_pcm_substream_chip(substream);
struct snd_soc_device *socdev = rtd->socdev;
struct snd_pcm_runtime *runtime = substream->runtime;
struct txx9aclc_dmadata *dmadata = runtime->private_data;
int ret;
ret = snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(params));
if (ret < 0)
return ret;
dev_dbg(socdev->dev,
"runtime->dma_area = %#lx dma_addr = %#lx dma_bytes = %zd "
"runtime->min_align %ld\n",
(unsigned long)runtime->dma_area,
(unsigned long)runtime->dma_addr, runtime->dma_bytes,
runtime->min_align);
dev_dbg(socdev->dev,
"periods %d period_bytes %d stream %d\n",
params_periods(params), params_period_bytes(params),
substream->stream);
dmadata->substream = substream;
dmadata->pos = 0;
return 0;
}
static int txx9aclc_pcm_hw_free(struct snd_pcm_substream *substream)
{
return snd_pcm_lib_free_pages(substream);
}
static int txx9aclc_pcm_prepare(struct snd_pcm_substream *substream)
{
struct snd_pcm_runtime *runtime = substream->runtime;
struct txx9aclc_dmadata *dmadata = runtime->private_data;
dmadata->dma_addr = runtime->dma_addr;
dmadata->buffer_bytes = snd_pcm_lib_buffer_bytes(substream);
dmadata->period_bytes = snd_pcm_lib_period_bytes(substream);
if (dmadata->buffer_bytes == dmadata->period_bytes) {
dmadata->frag_bytes = dmadata->period_bytes >> 1;
dmadata->frags = 2;
} else {
dmadata->frag_bytes = dmadata->period_bytes;
dmadata->frags = dmadata->buffer_bytes / dmadata->period_bytes;
}
dmadata->frag_count = 0;
dmadata->pos = 0;
return 0;
}
static void txx9aclc_dma_complete(void *arg)
{
struct txx9aclc_dmadata *dmadata = arg;
unsigned long flags;
/* dma completion handler cannot submit new operations */
spin_lock_irqsave(&dmadata->dma_lock, flags);
if (dmadata->frag_count >= 0) {
dmadata->dmacount--;
BUG_ON(dmadata->dmacount < 0);
tasklet_schedule(&dmadata->tasklet);
}
spin_unlock_irqrestore(&dmadata->dma_lock, flags);
}
static struct dma_async_tx_descriptor *
txx9aclc_dma_submit(struct txx9aclc_dmadata *dmadata, dma_addr_t buf_dma_addr)
{
struct dma_chan *chan = dmadata->dma_chan;
struct dma_async_tx_descriptor *desc;
struct scatterlist sg;
sg_init_table(&sg, 1);
sg_set_page(&sg, pfn_to_page(PFN_DOWN(buf_dma_addr)),
dmadata->frag_bytes, buf_dma_addr & (PAGE_SIZE - 1));
sg_dma_address(&sg) = buf_dma_addr;
desc = chan->device->device_prep_slave_sg(chan, &sg, 1,
dmadata->substream->stream == SNDRV_PCM_STREAM_PLAYBACK ?
DMA_TO_DEVICE : DMA_FROM_DEVICE,
DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
if (!desc) {
dev_err(&chan->dev->device, "cannot prepare slave dma\n");
return NULL;
}
desc->callback = txx9aclc_dma_complete;
desc->callback_param = dmadata;
desc->tx_submit(desc);
return desc;
}
#define NR_DMA_CHAIN 2
static void txx9aclc_dma_tasklet(unsigned long data)
{
struct txx9aclc_dmadata *dmadata = (struct txx9aclc_dmadata *)data;
struct dma_chan *chan = dmadata->dma_chan;
struct dma_async_tx_descriptor *desc;
struct snd_pcm_substream *substream = dmadata->substream;
u32 ctlbit = substream->stream == SNDRV_PCM_STREAM_PLAYBACK ?
ACCTL_AUDODMA : ACCTL_AUDIDMA;
int i;
unsigned long flags;
spin_lock_irqsave(&dmadata->dma_lock, flags);
if (dmadata->frag_count < 0) {
struct txx9aclc_soc_device *dev =
container_of(dmadata, struct txx9aclc_soc_device,
dmadata[substream->stream]);
struct txx9aclc_plat_drvdata *drvdata =
txx9aclc_get_plat_drvdata(dev);
void __iomem *base = drvdata->base;
spin_unlock_irqrestore(&dmadata->dma_lock, flags);
chan->device->device_terminate_all(chan);
/* first time */
for (i = 0; i < NR_DMA_CHAIN; i++) {
desc = txx9aclc_dma_submit(dmadata,
dmadata->dma_addr + i * dmadata->frag_bytes);
if (!desc)
return;
}
dmadata->dmacount = NR_DMA_CHAIN;
chan->device->device_issue_pending(chan);
spin_lock_irqsave(&dmadata->dma_lock, flags);
__raw_writel(ctlbit, base + ACCTLEN);
dmadata->frag_count = NR_DMA_CHAIN % dmadata->frags;
spin_unlock_irqrestore(&dmadata->dma_lock, flags);
return;
}
BUG_ON(dmadata->dmacount >= NR_DMA_CHAIN);
while (dmadata->dmacount < NR_DMA_CHAIN) {
dmadata->dmacount++;
spin_unlock_irqrestore(&dmadata->dma_lock, flags);
desc = txx9aclc_dma_submit(dmadata,
dmadata->dma_addr +
dmadata->frag_count * dmadata->frag_bytes);
if (!desc)
return;
chan->device->device_issue_pending(chan);
spin_lock_irqsave(&dmadata->dma_lock, flags);
dmadata->frag_count++;
dmadata->frag_count %= dmadata->frags;
dmadata->pos += dmadata->frag_bytes;
dmadata->pos %= dmadata->buffer_bytes;
if ((dmadata->frag_count * dmadata->frag_bytes) %
dmadata->period_bytes == 0)
snd_pcm_period_elapsed(substream);
}
spin_unlock_irqrestore(&dmadata->dma_lock, flags);
}
static int txx9aclc_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
{
struct txx9aclc_dmadata *dmadata = substream->runtime->private_data;
struct snd_soc_pcm_runtime *rtd = substream->private_data;
struct txx9aclc_soc_device *dev =
container_of(rtd->socdev, struct txx9aclc_soc_device, soc_dev);
struct txx9aclc_plat_drvdata *drvdata = txx9aclc_get_plat_drvdata(dev);
void __iomem *base = drvdata->base;
unsigned long flags;
int ret = 0;
u32 ctlbit = substream->stream == SNDRV_PCM_STREAM_PLAYBACK ?
ACCTL_AUDODMA : ACCTL_AUDIDMA;
spin_lock_irqsave(&dmadata->dma_lock, flags);
switch (cmd) {
case SNDRV_PCM_TRIGGER_START:
dmadata->frag_count = -1;
tasklet_schedule(&dmadata->tasklet);
break;
case SNDRV_PCM_TRIGGER_STOP:
case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
case SNDRV_PCM_TRIGGER_SUSPEND:
__raw_writel(ctlbit, base + ACCTLDIS);
break;
case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
case SNDRV_PCM_TRIGGER_RESUME:
__raw_writel(ctlbit, base + ACCTLEN);
break;
default:
ret = -EINVAL;
}
spin_unlock_irqrestore(&dmadata->dma_lock, flags);
return ret;
}
static snd_pcm_uframes_t
txx9aclc_pcm_pointer(struct snd_pcm_substream *substream)
{
struct txx9aclc_dmadata *dmadata = substream->runtime->private_data;
return bytes_to_frames(substream->runtime, dmadata->pos);
}
static int txx9aclc_pcm_open(struct snd_pcm_substream *substream)
{
struct snd_soc_pcm_runtime *rtd = substream->private_data;
struct txx9aclc_soc_device *dev =
container_of(rtd->socdev, struct txx9aclc_soc_device, soc_dev);
struct txx9aclc_dmadata *dmadata = &dev->dmadata[substream->stream];
int ret;
ret = snd_soc_set_runtime_hwparams(substream, &txx9aclc_pcm_hardware);
if (ret)
return ret;
/* ensure that buffer size is a multiple of period size */
ret = snd_pcm_hw_constraint_integer(substream->runtime,
SNDRV_PCM_HW_PARAM_PERIODS);
if (ret < 0)
return ret;
substream->runtime->private_data = dmadata;
return 0;
}
static int txx9aclc_pcm_close(struct snd_pcm_substream *substream)
{
struct txx9aclc_dmadata *dmadata = substream->runtime->private_data;
struct dma_chan *chan = dmadata->dma_chan;
dmadata->frag_count = -1;
chan->device->device_terminate_all(chan);
return 0;
}
static struct snd_pcm_ops txx9aclc_pcm_ops = {
.open = txx9aclc_pcm_open,
.close = txx9aclc_pcm_close,
.ioctl = snd_pcm_lib_ioctl,
.hw_params = txx9aclc_pcm_hw_params,
.hw_free = txx9aclc_pcm_hw_free,
.prepare = txx9aclc_pcm_prepare,
.trigger = txx9aclc_pcm_trigger,
.pointer = txx9aclc_pcm_pointer,
};
static void txx9aclc_pcm_free_dma_buffers(struct snd_pcm *pcm)
{
snd_pcm_lib_preallocate_free_for_all(pcm);
}
static int txx9aclc_pcm_new(struct snd_card *card, struct snd_soc_dai *dai,
struct snd_pcm *pcm)
{
return snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV,
card->dev, 64 * 1024, 4 * 1024 * 1024);
}
static bool filter(struct dma_chan *chan, void *param)
{
struct txx9aclc_dmadata *dmadata = param;
char devname[BUS_ID_SIZE + 2];
sprintf(devname, "%s.%d", dmadata->dma_res->name,
(int)dmadata->dma_res->start);
if (strcmp(dev_name(chan->device->dev), devname) == 0) {
chan->private = &dmadata->dma_slave;
return true;
}
return false;
}
static int txx9aclc_dma_init(struct txx9aclc_soc_device *dev,
struct txx9aclc_dmadata *dmadata)
{
struct txx9aclc_plat_drvdata *drvdata = txx9aclc_get_plat_drvdata(dev);
struct txx9dmac_slave *ds = &dmadata->dma_slave;
dma_cap_mask_t mask;
spin_lock_init(&dmadata->dma_lock);
ds->reg_width = sizeof(u32);
if (dmadata->stream == SNDRV_PCM_STREAM_PLAYBACK) {
ds->tx_reg = drvdata->physbase + ACAUDODAT;
ds->rx_reg = 0;
} else {
ds->tx_reg = 0;
ds->rx_reg = drvdata->physbase + ACAUDIDAT;
}
/* Try to grab a DMA channel */
dma_cap_zero(mask);
dma_cap_set(DMA_SLAVE, mask);
dmadata->dma_chan = dma_request_channel(mask, filter, dmadata);
if (!dmadata->dma_chan) {
dev_err(dev->soc_dev.dev,
"DMA channel for %s is not available\n",
dmadata->stream == SNDRV_PCM_STREAM_PLAYBACK ?
"playback" : "capture");
return -EBUSY;
}
tasklet_init(&dmadata->tasklet, txx9aclc_dma_tasklet,
(unsigned long)dmadata);
return 0;
}
static int txx9aclc_pcm_probe(struct platform_device *pdev)
{
struct snd_soc_device *socdev = platform_get_drvdata(pdev);
struct txx9aclc_soc_device *dev =
container_of(socdev, struct txx9aclc_soc_device, soc_dev);
struct resource *r;
int i;
int ret;
dev->dmadata[0].stream = SNDRV_PCM_STREAM_PLAYBACK;
dev->dmadata[1].stream = SNDRV_PCM_STREAM_CAPTURE;
for (i = 0; i < 2; i++) {
r = platform_get_resource(dev->aclc_pdev, IORESOURCE_DMA, i);
if (!r) {
ret = -EBUSY;
goto exit;
}
dev->dmadata[i].dma_res = r;
ret = txx9aclc_dma_init(dev, &dev->dmadata[i]);
if (ret)
goto exit;
}
return 0;
exit:
for (i = 0; i < 2; i++) {
if (dev->dmadata[i].dma_chan)
dma_release_channel(dev->dmadata[i].dma_chan);
dev->dmadata[i].dma_chan = NULL;
}
return ret;
}
static int txx9aclc_pcm_remove(struct platform_device *pdev)
{
struct snd_soc_device *socdev = platform_get_drvdata(pdev);
struct txx9aclc_soc_device *dev =
container_of(socdev, struct txx9aclc_soc_device, soc_dev);
struct txx9aclc_plat_drvdata *drvdata = txx9aclc_get_plat_drvdata(dev);
void __iomem *base = drvdata->base;
int i;
/* disable all FIFO DMAs */
__raw_writel(ACCTL_AUDODMA | ACCTL_AUDIDMA, base + ACCTLDIS);
/* dummy R/W to clear pending DMAREQ if any */
__raw_writel(__raw_readl(base + ACAUDIDAT), base + ACAUDODAT);
for (i = 0; i < 2; i++) {
struct txx9aclc_dmadata *dmadata = &dev->dmadata[i];
struct dma_chan *chan = dmadata->dma_chan;
if (chan) {
dmadata->frag_count = -1;
chan->device->device_terminate_all(chan);
dma_release_channel(chan);
}
dev->dmadata[i].dma_chan = NULL;
}
return 0;
}
struct snd_soc_platform txx9aclc_soc_platform = {
.name = "txx9aclc-audio",
.probe = txx9aclc_pcm_probe,
.remove = txx9aclc_pcm_remove,
.pcm_ops = &txx9aclc_pcm_ops,
.pcm_new = txx9aclc_pcm_new,
.pcm_free = txx9aclc_pcm_free_dma_buffers,
};
EXPORT_SYMBOL_GPL(txx9aclc_soc_platform);
static int __init txx9aclc_soc_platform_init(void)
{
return snd_soc_register_platform(&txx9aclc_soc_platform);
}
static void __exit txx9aclc_soc_platform_exit(void)
{
snd_soc_unregister_platform(&txx9aclc_soc_platform);
}
module_init(txx9aclc_soc_platform_init);
module_exit(txx9aclc_soc_platform_exit);
MODULE_AUTHOR("Atsushi Nemoto <anemo@mba.ocn.ne.jp>");
MODULE_DESCRIPTION("TXx9 ACLC Audio DMA driver");
MODULE_LICENSE("GPL");
