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// SPDX-License-Identifier: GPL-2.0
//
// Socionext UniPhier AIO DMA driver.
//
// Copyright (c) 2016-2018 Socionext Inc.
#include <linux/dma-mapping.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/soc.h>
#include "aio.h"
static struct snd_pcm_hardware uniphier_aiodma_hw = {
.info = SNDRV_PCM_INFO_MMAP |
SNDRV_PCM_INFO_MMAP_VALID |
SNDRV_PCM_INFO_INTERLEAVED,
.period_bytes_min = 256,
.period_bytes_max = 4096,
.periods_min = 4,
.periods_max = 1024,
.buffer_bytes_max = 128 * 1024,
};
static void aiodma_pcm_irq(struct uniphier_aio_sub *sub)
{
struct snd_pcm_runtime *runtime = sub->substream->runtime;
int bytes = runtime->period_size *
runtime->channels * samples_to_bytes(runtime, 1);
int ret;
spin_lock(&sub->lock);
ret = aiodma_rb_set_threshold(sub, runtime->dma_bytes,
sub->threshold + bytes);
if (!ret)
sub->threshold += bytes;
aiodma_rb_sync(sub, runtime->dma_addr, runtime->dma_bytes, bytes);
aiodma_rb_clear_irq(sub);
spin_unlock(&sub->lock);
snd_pcm_period_elapsed(sub->substream);
}
static void aiodma_compr_irq(struct uniphier_aio_sub *sub)
{
struct snd_compr_runtime *runtime = sub->cstream->runtime;
int bytes = runtime->fragment_size;
int ret;
spin_lock(&sub->lock);
ret = aiodma_rb_set_threshold(sub, sub->compr_bytes,
sub->threshold + bytes);
if (!ret)
sub->threshold += bytes;
aiodma_rb_sync(sub, sub->compr_addr, sub->compr_bytes, bytes);
aiodma_rb_clear_irq(sub);
spin_unlock(&sub->lock);
snd_compr_fragment_elapsed(sub->cstream);
}
static irqreturn_t aiodma_irq(int irq, void *p)
{
struct platform_device *pdev = p;
struct uniphier_aio_chip *chip = platform_get_drvdata(pdev);
irqreturn_t ret = IRQ_NONE;
int i, j;
for (i = 0; i < chip->num_aios; i++) {
struct uniphier_aio *aio = &chip->aios[i];
for (j = 0; j < ARRAY_SIZE(aio->sub); j++) {
struct uniphier_aio_sub *sub = &aio->sub[j];
/* Skip channel that does not trigger */
if (!sub->running || !aiodma_rb_is_irq(sub))
continue;
if (sub->substream)
aiodma_pcm_irq(sub);
if (sub->cstream)
aiodma_compr_irq(sub);
ret = IRQ_HANDLED;
}
}
return ret;
}
static int uniphier_aiodma_open(struct snd_soc_component *component,
struct snd_pcm_substream *substream)
{
struct snd_pcm_runtime *runtime = substream->runtime;
snd_soc_set_runtime_hwparams(substream, &uniphier_aiodma_hw);
return snd_pcm_hw_constraint_step(runtime, 0,
SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 256);
}
static int uniphier_aiodma_prepare(struct snd_soc_component *component,
struct snd_pcm_substream *substream)
{
struct snd_pcm_runtime *runtime = substream->runtime;
struct snd_soc_pcm_runtime *rtd = snd_pcm_substream_chip(substream);
struct uniphier_aio *aio = uniphier_priv(asoc_rtd_to_cpu(rtd, 0));
struct uniphier_aio_sub *sub = &aio->sub[substream->stream];
int bytes = runtime->period_size *
runtime->channels * samples_to_bytes(runtime, 1);
unsigned long flags;
int ret;
ret = aiodma_ch_set_param(sub);
if (ret)
return ret;
spin_lock_irqsave(&sub->lock, flags);
ret = aiodma_rb_set_buffer(sub, runtime->dma_addr,
runtime->dma_addr + runtime->dma_bytes,
bytes);
spin_unlock_irqrestore(&sub->lock, flags);
if (ret)
return ret;
return 0;
}
static int uniphier_aiodma_trigger(struct snd_soc_component *component,
struct snd_pcm_substream *substream, int cmd)
{
struct snd_pcm_runtime *runtime = substream->runtime;
struct snd_soc_pcm_runtime *rtd = snd_pcm_substream_chip(substream);
struct uniphier_aio *aio = uniphier_priv(asoc_rtd_to_cpu(rtd, 0));
struct uniphier_aio_sub *sub = &aio->sub[substream->stream];
struct device *dev = &aio->chip->pdev->dev;
int bytes = runtime->period_size *
runtime->channels * samples_to_bytes(runtime, 1);
unsigned long flags;
spin_lock_irqsave(&sub->lock, flags);
switch (cmd) {
case SNDRV_PCM_TRIGGER_START:
aiodma_rb_sync(sub, runtime->dma_addr, runtime->dma_bytes,
bytes);
aiodma_ch_set_enable(sub, 1);
sub->running = 1;
break;
case SNDRV_PCM_TRIGGER_STOP:
sub->running = 0;
aiodma_ch_set_enable(sub, 0);
break;
default:
dev_warn(dev, "Unknown trigger(%d) ignored\n", cmd);
break;
}
spin_unlock_irqrestore(&sub->lock, flags);
return 0;
}
static snd_pcm_uframes_t uniphier_aiodma_pointer(
struct snd_soc_component *component,
struct snd_pcm_substream *substream)
{
struct snd_pcm_runtime *runtime = substream->runtime;
struct snd_soc_pcm_runtime *rtd = snd_pcm_substream_chip(substream);
struct uniphier_aio *aio = uniphier_priv(asoc_rtd_to_cpu(rtd, 0));
struct uniphier_aio_sub *sub = &aio->sub[substream->stream];
int bytes = runtime->period_size *
runtime->channels * samples_to_bytes(runtime, 1);
unsigned long flags;
snd_pcm_uframes_t pos;
spin_lock_irqsave(&sub->lock, flags);
aiodma_rb_sync(sub, runtime->dma_addr, runtime->dma_bytes, bytes);
if (sub->swm->dir == PORT_DIR_OUTPUT)
pos = bytes_to_frames(runtime, sub->rd_offs);
else
pos = bytes_to_frames(runtime, sub->wr_offs);
spin_unlock_irqrestore(&sub->lock, flags);
return pos;
}
static int uniphier_aiodma_mmap(struct snd_soc_component *component,
struct snd_pcm_substream *substream,
struct vm_area_struct *vma)
{
vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
return remap_pfn_range(vma, vma->vm_start,
substream->dma_buffer.addr >> PAGE_SHIFT,
vma->vm_end - vma->vm_start, vma->vm_page_prot);
}
static int uniphier_aiodma_new(struct snd_soc_component *component,
struct snd_soc_pcm_runtime *rtd)
{
struct device *dev = rtd->card->snd_card->dev;
struct snd_pcm *pcm = rtd->pcm;
int ret;
ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(33));
if (ret)
return ret;
snd_pcm_set_managed_buffer_all(pcm,
SNDRV_DMA_TYPE_DEV, dev,
uniphier_aiodma_hw.buffer_bytes_max,
uniphier_aiodma_hw.buffer_bytes_max);
return 0;
}
static const struct snd_soc_component_driver uniphier_soc_platform = {
.open = uniphier_aiodma_open,
.prepare = uniphier_aiodma_prepare,
.trigger = uniphier_aiodma_trigger,
.pointer = uniphier_aiodma_pointer,
.mmap = uniphier_aiodma_mmap,
.pcm_construct = uniphier_aiodma_new,
.compress_ops = &uniphier_aio_compress_ops,
};
static const struct regmap_config aiodma_regmap_config = {
.reg_bits = 32,
.reg_stride = 4,
.val_bits = 32,
.max_register = 0x7fffc,
.cache_type = REGCACHE_NONE,
};
/**
* uniphier_aiodma_soc_register_platform - register the AIO DMA
* @pdev: the platform device
*
* Register and setup the DMA of AIO to transfer the sound data to device.
* This function need to call once at driver startup and need NOT to call
* unregister function.
*
* Return: Zero if successful, otherwise a negative value on error.
*/
int uniphier_aiodma_soc_register_platform(struct platform_device *pdev)
{
struct uniphier_aio_chip *chip = platform_get_drvdata(pdev);
struct device *dev = &pdev->dev;
void __iomem *preg;
int
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