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// SPDX-License-Identifier: GPL-2.0
//
// Copyright (c) 2020 BayLibre, SAS.
// Author: Jerome Brunet <jbrunet@baylibre.com>
#include <linux/bitfield.h>
#include <linux/clk.h>
#include <linux/dma-mapping.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>
#include <sound/soc-dai.h>
#include "aiu-fifo.h"
#define AIU_MEM_START 0x00
#define AIU_MEM_RD 0x04
#define AIU_MEM_END 0x08
#define AIU_MEM_MASKS 0x0c
#define AIU_MEM_MASK_CH_RD GENMASK(7, 0)
#define AIU_MEM_MASK_CH_MEM GENMASK(15, 8)
#define AIU_MEM_CONTROL 0x10
#define AIU_MEM_CONTROL_INIT BIT(0)
#define AIU_MEM_CONTROL_FILL_EN BIT(1)
#define AIU_MEM_CONTROL_EMPTY_EN BIT(2)
static struct snd_soc_dai *aiu_fifo_dai(struct snd_pcm_substream *ss)
{
struct snd_soc_pcm_runtime *rtd = ss->private_data;
return snd_soc_rtd_to_cpu(rtd, 0);
}
snd_pcm_uframes_t aiu_fifo_pointer(struct snd_soc_component *component,
struct snd_pcm_substream *substream)
{
struct snd_soc_dai *dai = aiu_fifo_dai(substream);
struct aiu_fifo *fifo = snd_soc_dai_dma_data_get_playback(dai);
struct snd_pcm_runtime *runtime = substream->runtime;
unsigned int addr;
addr = snd_soc_component_read(component, fifo->mem_offset + AIU_MEM_RD);
return bytes_to_frames(runtime, addr - (unsigned int)runtime->dma_addr);
}
static void aiu_fifo_enable(struct snd_soc_dai *dai, bool enable)
{
struct snd_soc_component *component = dai->component;
struct aiu_fifo *fifo = snd_soc_dai_dma_data_get_playback(dai);
unsigned int en_mask = (AIU_MEM_CONTROL_FILL_EN |
AIU_MEM_CONTROL_EMPTY_EN);
snd_soc_component_update_bits(component,
fifo->mem_offset + AIU_MEM_CONTROL,
en_mask, enable ? en_mask : 0);
}
int aiu_fifo_trigger(struct snd_pcm_substream *substream, int cmd,
struct snd_soc_dai *dai)
{
switch (cmd) {
case SNDRV_PCM_TRIGGER_START:
case SNDRV_PCM_TRIGGER_RESUME:
case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
aiu_fifo_enable(dai, true);
break;
case SNDRV_PCM_TRIGGER_SUSPEND:
case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
case SNDRV_PCM_TRIGGER_STOP:
aiu_fifo_enable(dai, false);
break;
default:
return -EINVAL;
}
return 0;
}
int aiu_fifo_prepare(struct snd_pcm_substream *substream,
struct snd_soc_dai *dai)
{
struct snd_soc_component *component = dai->component;
struct aiu_fifo *fifo = snd_soc_dai_dma_data_get_playback(dai);
snd_soc_component_update_bits(component,
fifo->mem_offset + AIU_MEM_CONTROL,
AIU_MEM_CONTROL_INIT,
AIU_MEM_CONTROL_INIT);
snd_soc_component_update_bits(component,
fifo->mem_offset + AIU_MEM_CONTROL,
AIU_MEM_CONTROL_INIT, 0);
return 0;
}
int aiu_fifo_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *params,
struct snd_soc_dai *dai)
{
struct snd_pcm_runtime *runtime = substream->runtime;
struct snd_soc_component *component = dai->component;
struct aiu_fifo *fifo = snd_soc_dai_dma_data_get_playback(dai);
dma_addr_t end;
/* Setup the fifo boundaries */
end = runtime->dma_addr + runtime->dma_bytes - fifo->fifo_block;
snd_soc_component_write(component, fifo->mem_offset + AIU_MEM_START,
runtime->dma_addr);
snd_soc_component_write(component, fifo->mem_offset + AIU_MEM_RD,
runtime->dma_addr);
snd_soc_component_write(component, fifo->mem_offset + AIU_MEM_END,
end);
/* Setup the fifo to read all the memory - no skip */
snd_soc_component_update_bits(component,
fifo->mem_offset + AIU_MEM_MASKS,
AIU_MEM_MASK_CH_RD | AIU_MEM_MASK_CH_MEM,
FIELD_PREP(AIU_MEM_MASK_CH_RD, 0xff) |
FIELD_PREP(AIU_MEM_MASK_CH_MEM, 0xff));
return 0;
}
static irqreturn_t aiu_fifo_isr(int irq, void *dev_id)
{
struct snd_pcm_substream *playback = dev_id;
snd_pcm_period_elapsed(playback);
return IRQ_HANDLED;
}
int aiu_fifo_startup(struct snd_pcm_substream *substream,
struct snd_soc_dai *dai)
{
struct aiu_fifo *fifo = snd_soc_dai_dma_data_get_playback(dai);
int ret;
snd_soc_set_runtime_hwparams(substream, fifo->pcm);
/*
* Make sure the buffer and period size are multiple of the fifo burst
* size
*/
ret = snd_pcm_hw_constraint_step(substream->runtime, 0,
SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
fifo->fifo_block);
if (ret)
return ret;
ret = snd_pcm_hw_constraint_step(substream->runtime, 0,
SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
fifo->fifo_block);
if (ret)
return ret;
ret = clk_prepare_enable(fifo->pclk);
if (ret)
return ret;
ret = request_irq(fifo->irq, aiu_fifo_isr, 0, dev_name(dai->dev),
substream);
if (ret)
clk_disable_unprepare(fifo->pclk);
return ret;
}
void aiu_fifo_shutdown(struct snd_pcm_substream *substream,
struct snd_soc_dai *dai)
{
struct aiu_fifo *fifo = snd_soc_dai_dma_data_get_playback(dai);
free_irq(fifo->irq, substream);
clk_disable_unprepare(fifo->pclk);
}
int aiu_fifo_pcm_new(struct snd_soc_pcm_runtime *rtd,
struct snd_soc_dai *dai)
{
struct snd_card *card = rtd->card->snd_card;
struct aiu_fifo *fifo = snd_soc_dai_dma_data_get_playback(dai);
size_t size = fifo->pcm->buffer_bytes_max;
int ret;
ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32));
if (ret)
return ret;
snd_pcm_set_managed_buffer_all(rtd->pcm, SNDRV_DMA_TYPE_DEV,
card->dev, size, size);
return 0;
}
int aiu_fifo_dai_probe(struct snd_soc_dai *dai)
{
struct aiu_fifo *fifo;
fifo = kzalloc(sizeof(*fifo), GFP_KERNEL);
if (!fifo)
return -ENOMEM;
snd_soc_dai_dma_data_set_playback(dai, fifo);
return 0;
}
int aiu_fifo_dai_remove(struct snd_soc_dai *dai)
{
struct aiu_fifo *fifo = snd_soc_dai_dma_data_get_playback(dai);
kfree(fifo);
return 0;
}
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