forked from Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
422 lines
12 KiB
422 lines
12 KiB
// SPDX-License-Identifier: GPL-2.0-only |
|
/* |
|
* Generic TXx9 ACLC platform driver |
|
* |
|
* Copyright (C) 2009 Atsushi Nemoto |
|
* |
|
* Based on RBTX49xx patch from CELF patch archive. |
|
* (C) Copyright TOSHIBA CORPORATION 2004-2006 |
|
*/ |
|
|
|
#include <linux/module.h> |
|
#include <linux/init.h> |
|
#include <linux/platform_device.h> |
|
#include <linux/scatterlist.h> |
|
#include <linux/slab.h> |
|
#include <linux/dmaengine.h> |
|
#include <sound/core.h> |
|
#include <sound/pcm.h> |
|
#include <sound/pcm_params.h> |
|
#include <sound/soc.h> |
|
#include "txx9aclc.h" |
|
|
|
#define DRV_NAME "txx9aclc" |
|
|
|
static struct txx9aclc_soc_device { |
|
struct txx9aclc_dmadata dmadata[2]; |
|
} txx9aclc_soc_device; |
|
|
|
/* REVISIT: How to find txx9aclc_drvdata from snd_ac97? */ |
|
static struct txx9aclc_plat_drvdata *txx9aclc_drvdata; |
|
|
|
static int txx9aclc_dma_init(struct txx9aclc_soc_device *dev, |
|
struct txx9aclc_dmadata *dmadata); |
|
|
|
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, |
|
.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_soc_component *component, |
|
struct snd_pcm_substream *substream, |
|
struct snd_pcm_hw_params *params) |
|
{ |
|
struct snd_pcm_runtime *runtime = substream->runtime; |
|
struct txx9aclc_dmadata *dmadata = runtime->private_data; |
|
|
|
dev_dbg(component->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(component->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_prepare(struct snd_soc_component *component, |
|
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--; |
|
if (!WARN_ON(dmadata->dmacount < 0)) |
|
queue_work(system_highpri_wq, &dmadata->work); |
|
} |
|
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 = dmaengine_prep_slave_sg(chan, &sg, 1, |
|
dmadata->substream->stream == SNDRV_PCM_STREAM_PLAYBACK ? |
|
DMA_MEM_TO_DEV : DMA_DEV_TO_MEM, |
|
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; |
|
dmaengine_submit(desc); |
|
return desc; |
|
} |
|
|
|
#define NR_DMA_CHAIN 2 |
|
|
|
static void txx9aclc_dma_work(struct work_struct *work) |
|
{ |
|
struct txx9aclc_dmadata *dmadata = |
|
container_of(work, struct txx9aclc_dmadata, work); |
|
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_plat_drvdata *drvdata = txx9aclc_drvdata; |
|
void __iomem *base = drvdata->base; |
|
|
|
spin_unlock_irqrestore(&dmadata->dma_lock, flags); |
|
dmaengine_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; |
|
dma_async_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; |
|
} |
|
if (WARN_ON(dmadata->dmacount >= NR_DMA_CHAIN)) { |
|
spin_unlock_irqrestore(&dmadata->dma_lock, flags); |
|
return; |
|
} |
|
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; |
|
dma_async_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_soc_component *component, |
|
struct snd_pcm_substream *substream, int cmd) |
|
{ |
|
struct txx9aclc_dmadata *dmadata = substream->runtime->private_data; |
|
struct txx9aclc_plat_drvdata *drvdata = txx9aclc_drvdata; |
|
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; |
|
queue_work(system_highpri_wq, &dmadata->work); |
|
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_soc_component *component, |
|
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_soc_component *component, |
|
struct snd_pcm_substream *substream) |
|
{ |
|
struct txx9aclc_soc_device *dev = &txx9aclc_soc_device; |
|
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_soc_component *component, |
|
struct snd_pcm_substream *substream) |
|
{ |
|
struct txx9aclc_dmadata *dmadata = substream->runtime->private_data; |
|
struct dma_chan *chan = dmadata->dma_chan; |
|
|
|
dmadata->frag_count = -1; |
|
dmaengine_terminate_all(chan); |
|
return 0; |
|
} |
|
|
|
static int txx9aclc_pcm_new(struct snd_soc_component *component, |
|
struct snd_soc_pcm_runtime *rtd) |
|
{ |
|
struct snd_card *card = rtd->card->snd_card; |
|
struct snd_soc_dai *dai = asoc_rtd_to_cpu(rtd, 0); |
|
struct snd_pcm *pcm = rtd->pcm; |
|
struct platform_device *pdev = to_platform_device(component->dev); |
|
struct txx9aclc_soc_device *dev; |
|
struct resource *r; |
|
int i; |
|
int ret; |
|
|
|
/* at this point onwards the AC97 component has probed and this will be valid */ |
|
dev = snd_soc_dai_get_drvdata(dai); |
|
|
|
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(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; |
|
} |
|
|
|
snd_pcm_set_managed_buffer_all(pcm, SNDRV_DMA_TYPE_DEV, |
|
card->dev, 64 * 1024, 4 * 1024 * 1024); |
|
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 bool filter(struct dma_chan *chan, void *param) |
|
{ |
|
struct txx9aclc_dmadata *dmadata = param; |
|
char *devname; |
|
bool found = false; |
|
|
|
devname = kasprintf(GFP_KERNEL, "%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; |
|
found = true; |
|
} |
|
kfree(devname); |
|
return found; |
|
} |
|
|
|
static int txx9aclc_dma_init(struct txx9aclc_soc_device *dev, |
|
struct txx9aclc_dmadata *dmadata) |
|
{ |
|
struct txx9aclc_plat_drvdata *drvdata = txx9aclc_drvdata; |
|
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) { |
|
printk(KERN_ERR |
|
"DMA channel for %s is not available\n", |
|
dmadata->stream == SNDRV_PCM_STREAM_PLAYBACK ? |
|
"playback" : "capture"); |
|
return -EBUSY; |
|
} |
|
INIT_WORK(&dmadata->work, txx9aclc_dma_work); |
|
return 0; |
|
} |
|
|
|
static int txx9aclc_pcm_probe(struct snd_soc_component *component) |
|
{ |
|
snd_soc_component_set_drvdata(component, &txx9aclc_soc_device); |
|
return 0; |
|
} |
|
|
|
static void txx9aclc_pcm_remove(struct snd_soc_component *component) |
|
{ |
|
struct txx9aclc_soc_device *dev = snd_soc_component_get_drvdata(component); |
|
struct txx9aclc_plat_drvdata *drvdata = txx9aclc_drvdata; |
|
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; |
|
dmaengine_terminate_all(chan); |
|
dma_release_channel(chan); |
|
} |
|
dev->dmadata[i].dma_chan = NULL; |
|
} |
|
} |
|
|
|
static const struct snd_soc_component_driver txx9aclc_soc_component = { |
|
.name = DRV_NAME, |
|
.probe = txx9aclc_pcm_probe, |
|
.remove = txx9aclc_pcm_remove, |
|
.open = txx9aclc_pcm_open, |
|
.close = txx9aclc_pcm_close, |
|
.hw_params = txx9aclc_pcm_hw_params, |
|
.prepare = txx9aclc_pcm_prepare, |
|
.trigger = txx9aclc_pcm_trigger, |
|
.pointer = txx9aclc_pcm_pointer, |
|
.pcm_construct = txx9aclc_pcm_new, |
|
}; |
|
|
|
static int txx9aclc_soc_platform_probe(struct platform_device *pdev) |
|
{ |
|
return devm_snd_soc_register_component(&pdev->dev, |
|
&txx9aclc_soc_component, NULL, 0); |
|
} |
|
|
|
static struct platform_driver txx9aclc_pcm_driver = { |
|
.driver = { |
|
.name = "txx9aclc-pcm-audio", |
|
}, |
|
|
|
.probe = txx9aclc_soc_platform_probe, |
|
}; |
|
|
|
module_platform_driver(txx9aclc_pcm_driver); |
|
|
|
MODULE_AUTHOR("Atsushi Nemoto <[email protected]>"); |
|
MODULE_DESCRIPTION("TXx9 ACLC Audio DMA driver"); |
|
MODULE_LICENSE("GPL");
|
|
|