#include <linux/platform_device.h>
#include <linux/module.h>
#include <linux/bitfield.h>
#include <linux/err.h>
#include <linux/io.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>
#include <sound/soc-dai.h>
#include <linux/pm_runtime.h>
#include "acp63.h"
#define DRV_NAME "acp_ps_pdm_dma"
static int pdm_gain = 3;
module_param(pdm_gain, int, 0644);
MODULE_PARM_DESC(pdm_gain, "Gain control (0-3)");
static const struct snd_pcm_hardware acp63_pdm_hardware_capture = {
.info = SNDRV_PCM_INFO_INTERLEAVED |
SNDRV_PCM_INFO_BLOCK_TRANSFER |
SNDRV_PCM_INFO_MMAP |
SNDRV_PCM_INFO_MMAP_VALID |
SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_RESUME,
.formats = SNDRV_PCM_FMTBIT_S32_LE,
.channels_min = 2,
.channels_max = 2,
.rates = SNDRV_PCM_RATE_48000,
.rate_min = 48000,
.rate_max = 48000,
.buffer_bytes_max = CAPTURE_MAX_NUM_PERIODS * CAPTURE_MAX_PERIOD_SIZE,
.period_bytes_min = CAPTURE_MIN_PERIOD_SIZE,
.period_bytes_max = CAPTURE_MAX_PERIOD_SIZE,
.periods_min = CAPTURE_MIN_NUM_PERIODS,
.periods_max = CAPTURE_MAX_NUM_PERIODS,
};
static void acp63_init_pdm_ring_buffer(u32 physical_addr, u32 buffer_size,
u32 watermark_size, void __iomem *acp_base)
{
writel(physical_addr, acp_base + ACP_WOV_RX_RINGBUFADDR);
writel(buffer_size, acp_base + ACP_WOV_RX_RINGBUFSIZE);
writel(watermark_size, acp_base + ACP_WOV_RX_INTR_WATERMARK_SIZE);
writel(0x01, acp_base + ACPAXI2AXI_ATU_CTRL);
}
static void acp63_enable_pdm_clock(void __iomem *acp_base)
{
u32 pdm_clk_enable, pdm_ctrl;
pdm_clk_enable = ACP_PDM_CLK_FREQ_MASK;
pdm_ctrl = 0x00;
writel(pdm_clk_enable, acp_base + ACP_WOV_CLK_CTRL);
pdm_ctrl = readl(acp_base + ACP_WOV_MISC_CTRL);
pdm_ctrl &= ~ACP_WOV_GAIN_CONTROL;
pdm_ctrl |= FIELD_PREP(ACP_WOV_GAIN_CONTROL, clamp(pdm_gain, 0, 3));
writel(pdm_ctrl, acp_base + ACP_WOV_MISC_CTRL);
}
static void acp63_enable_pdm_interrupts(struct pdm_dev_data *adata)
{
u32 ext_int_ctrl;
mutex_lock(adata->acp_lock);
ext_int_ctrl = readl(adata->acp63_base + ACP_EXTERNAL_INTR_CNTL);
ext_int_ctrl |= PDM_DMA_INTR_MASK;
writel(ext_int_ctrl, adata->acp63_base + ACP_EXTERNAL_INTR_CNTL);
mutex_unlock(adata->acp_lock);
}
static void acp63_disable_pdm_interrupts(struct pdm_dev_data *adata)
{
u32 ext_int_ctrl;
mutex_lock(adata->acp_lock);
ext_int_ctrl = readl(adata->acp63_base + ACP_EXTERNAL_INTR_CNTL);
ext_int_ctrl &= ~PDM_DMA_INTR_MASK;
writel(ext_int_ctrl, adata->acp63_base + ACP_EXTERNAL_INTR_CNTL);
mutex_unlock(adata->acp_lock);
}
static bool acp63_check_pdm_dma_status(void __iomem *acp_base)
{
bool pdm_dma_status;
u32 pdm_enable, pdm_dma_enable;
pdm_dma_status = false;
pdm_enable = readl(acp_base + ACP_WOV_PDM_ENABLE);
pdm_dma_enable = readl(acp_base + ACP_WOV_PDM_DMA_ENABLE);
if ((pdm_enable & ACP_PDM_ENABLE) && (pdm_dma_enable & ACP_PDM_DMA_EN_STATUS))
pdm_dma_status = true;
return pdm_dma_status;
}
static int acp63_start_pdm_dma(void __iomem *acp_base)
{
u32 pdm_enable;
u32 pdm_dma_enable;
int timeout;
pdm_enable = 0x01;
pdm_dma_enable = 0x01;
acp63_enable_pdm_clock(acp_base);
writel(pdm_enable, acp_base + ACP_WOV_PDM_ENABLE);
writel(pdm_dma_enable, acp_base + ACP_WOV_PDM_DMA_ENABLE);
timeout = 0;
while (++timeout < ACP_COUNTER) {
pdm_dma_enable = readl(acp_base + ACP_WOV_PDM_DMA_ENABLE);
if ((pdm_dma_enable & 0x02) == ACP_PDM_DMA_EN_STATUS)
return 0;
udelay(DELAY_US);
}
return -ETIMEDOUT;
}
static int acp63_stop_pdm_dma(void __iomem *acp_base)
{
u32 pdm_enable, pdm_dma_enable;
int timeout;
pdm_enable = 0x00;
pdm_dma_enable = 0x00;
pdm_enable = readl(acp_base + ACP_WOV_PDM_ENABLE);
pdm_dma_enable = readl(acp_base + ACP_WOV_PDM_DMA_ENABLE);
if (pdm_dma_enable & 0x01) {
pdm_dma_enable = 0x02;
writel(pdm_dma_enable, acp_base + ACP_WOV_PDM_DMA_ENABLE);
timeout = 0;
while (++timeout < ACP_COUNTER) {
pdm_dma_enable = readl(acp_base + ACP_WOV_PDM_DMA_ENABLE);
if ((pdm_dma_enable & 0x02) == 0x00)
break;
udelay(DELAY_US);
}
if (timeout == ACP_COUNTER)
return -ETIMEDOUT;
}
if (pdm_enable == ACP_PDM_ENABLE) {
pdm_enable = ACP_PDM_DISABLE;
writel(pdm_enable, acp_base + ACP_WOV_PDM_ENABLE);
}
writel(0x01, acp_base + ACP_WOV_PDM_FIFO_FLUSH);
return 0;
}
static void acp63_config_dma(struct pdm_stream_instance *rtd, int direction)
{
u16 page_idx;
u32 low, high, val;
dma_addr_t addr;
addr = rtd->dma_addr;
val = PDM_PTE_OFFSET;
writel(ACP_SRAM_PTE_OFFSET | BIT(31), rtd->acp63_base + ACPAXI2AXI_ATU_BASE_ADDR_GRP_1);
writel(PAGE_SIZE_4K_ENABLE, rtd->acp63_base + ACPAXI2AXI_ATU_PAGE_SIZE_GRP_1);
for (page_idx = 0; page_idx < rtd->num_pages; page_idx++) {
low = lower_32_bits(addr);
high = upper_32_bits(addr);
writel(low, rtd->acp63_base + ACP_SCRATCH_REG_0 + val);
high |= BIT(31);
writel(high, rtd->acp63_base + ACP_SCRATCH_REG_0 + val + 4);
val += 8;
addr += PAGE_SIZE;
}
}
static int acp63_pdm_dma_open(struct snd_soc_component *component,
struct snd_pcm_substream *substream)
{
struct snd_pcm_runtime *runtime;
struct pdm_dev_data *adata;
struct pdm_stream_instance *pdm_data;
int ret;
runtime = substream->runtime;
adata = dev_get_drvdata(component->dev);
pdm_data = kzalloc_obj(*pdm_data);
if (!pdm_data)
return -EINVAL;
if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
runtime->hw = acp63_pdm_hardware_capture;
ret = snd_pcm_hw_constraint_integer(runtime,
SNDRV_PCM_HW_PARAM_PERIODS);
if (ret < 0) {
dev_err(component->dev, "set integer constraint failed\n");
kfree(pdm_data);
return ret;
}
acp63_enable_pdm_interrupts(adata);
if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
adata->capture_stream = substream;
pdm_data->acp63_base = adata->acp63_base;
runtime->private_data = pdm_data;
return ret;
}
static int acp63_pdm_dma_hw_params(struct snd_soc_component *component,
struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *params)
{
struct pdm_stream_instance *rtd;
size_t size, period_bytes;
rtd = substream->runtime->private_data;
if (!rtd)
return -EINVAL;
size = params_buffer_bytes(params);
period_bytes = params_period_bytes(params);
rtd->dma_addr = substream->runtime->dma_addr;
rtd->num_pages = (PAGE_ALIGN(size) >> PAGE_SHIFT);
acp63_config_dma(rtd, substream->stream);
acp63_init_pdm_ring_buffer(PDM_MEM_WINDOW_START, size,
period_bytes, rtd->acp63_base);
return 0;
}
static u64 acp63_pdm_get_byte_count(struct pdm_stream_instance *rtd,
int direction)
{
u32 high, low;
u64 byte_count;
high = readl(rtd->acp63_base + ACP_WOV_RX_LINEARPOSITIONCNTR_HIGH);
byte_count = high;
low = readl(rtd->acp63_base + ACP_WOV_RX_LINEARPOSITIONCNTR_LOW);
byte_count = (byte_count << 32) | low;
return byte_count;
}
static snd_pcm_uframes_t acp63_pdm_dma_pointer(struct snd_soc_component *comp,
struct snd_pcm_substream *stream)
{
struct pdm_stream_instance *rtd;
u32 pos, buffersize;
u64 bytescount;
rtd = stream->runtime->private_data;
buffersize = frames_to_bytes(stream->runtime,
stream->runtime->buffer_size);
bytescount = acp63_pdm_get_byte_count(rtd, stream->stream);
if (bytescount > rtd->bytescount)
bytescount -= rtd->bytescount;
pos = do_div(bytescount, buffersize);
return bytes_to_frames(stream->runtime, pos);
}
static int acp63_pdm_dma_new(struct snd_soc_component *component,
struct snd_soc_pcm_runtime *rtd)
{
struct device *parent = component->dev->parent;
snd_pcm_set_managed_buffer_all(rtd->pcm, SNDRV_DMA_TYPE_DEV,
parent, MIN_BUFFER, MAX_BUFFER);
return 0;
}
static int acp63_pdm_dma_close(struct snd_soc_component *component,
struct snd_pcm_substream *substream)
{
struct pdm_dev_data *adata = dev_get_drvdata(component->dev);
struct snd_pcm_runtime *runtime = substream->runtime;
acp63_disable_pdm_interrupts(adata);
adata->capture_stream = NULL;
kfree(runtime->private_data);
return 0;
}
static int acp63_pdm_dai_trigger(struct snd_pcm_substream *substream,
int cmd, struct snd_soc_dai *dai)
{
struct pdm_stream_instance *rtd;
int ret;
bool pdm_status;
unsigned int ch_mask;
rtd = substream->runtime->private_data;
ret = 0;
switch (substream->runtime->channels) {
case TWO_CH:
ch_mask = 0x00;
break;
default:
return -EINVAL;
}
switch (cmd) {
case SNDRV_PCM_TRIGGER_START:
case SNDRV_PCM_TRIGGER_RESUME:
case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
writel(ch_mask, rtd->acp63_base + ACP_WOV_PDM_NO_OF_CHANNELS);
writel(PDM_DECIMATION_FACTOR, rtd->acp63_base + ACP_WOV_PDM_DECIMATION_FACTOR);
rtd->bytescount = acp63_pdm_get_byte_count(rtd, substream->stream);
pdm_status = acp63_check_pdm_dma_status(rtd->acp63_base);
if (!pdm_status)
ret = acp63_start_pdm_dma(rtd->acp63_base);
break;
case SNDRV_PCM_TRIGGER_STOP:
case SNDRV_PCM_TRIGGER_SUSPEND:
case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
pdm_status = acp63_check_pdm_dma_status(rtd->acp63_base);
if (pdm_status)
ret = acp63_stop_pdm_dma(rtd->acp63_base);
break;
default:
ret = -EINVAL;
break;
}
return ret;
}
static const struct snd_soc_dai_ops acp63_pdm_dai_ops = {
.trigger = acp63_pdm_dai_trigger,
};
static struct snd_soc_dai_driver acp63_pdm_dai_driver = {
.name = "acp_ps_pdm_dma.0",
.capture = {
.rates = SNDRV_PCM_RATE_48000,
.formats = SNDRV_PCM_FMTBIT_S32_LE,
.channels_min = 2,
.channels_max = 2,
.rate_min = 48000,
.rate_max = 48000,
},
.ops = &acp63_pdm_dai_ops,
};
static const struct snd_soc_component_driver acp63_pdm_component = {
.name = DRV_NAME,
.open = acp63_pdm_dma_open,
.close = acp63_pdm_dma_close,
.hw_params = acp63_pdm_dma_hw_params,
.pointer = acp63_pdm_dma_pointer,
.pcm_construct = acp63_pdm_dma_new,
};
static int acp63_pdm_audio_probe(struct platform_device *pdev)
{
struct resource *res;
struct pdm_dev_data *adata;
struct acp63_dev_data *acp_data;
struct device *parent;
int status;
parent = pdev->dev.parent;
acp_data = dev_get_drvdata(parent);
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res) {
dev_err(&pdev->dev, "IORESOURCE_MEM FAILED\n");
return -ENODEV;
}
adata = devm_kzalloc(&pdev->dev, sizeof(*adata), GFP_KERNEL);
if (!adata)
return -ENOMEM;
adata->acp63_base = devm_ioremap(&pdev->dev, res->start, resource_size(res));
if (!adata->acp63_base)
return -ENOMEM;
adata->capture_stream = NULL;
adata->acp_lock = &acp_data->acp_lock;
dev_set_drvdata(&pdev->dev, adata);
status = devm_snd_soc_register_component(&pdev->dev,
&acp63_pdm_component,
&acp63_pdm_dai_driver, 1);
if (status) {
dev_err(&pdev->dev, "Fail to register acp pdm dai\n");
return -ENODEV;
}
pm_runtime_set_autosuspend_delay(&pdev->dev, ACP_SUSPEND_DELAY_MS);
pm_runtime_use_autosuspend(&pdev->dev);
pm_runtime_mark_last_busy(&pdev->dev);
pm_runtime_set_active(&pdev->dev);
pm_runtime_enable(&pdev->dev);
return 0;
}
static void acp63_pdm_audio_remove(struct platform_device *pdev)
{
pm_runtime_disable(&pdev->dev);
}
static int acp63_pdm_resume(struct device *dev)
{
struct pdm_dev_data *adata;
struct snd_pcm_runtime *runtime;
struct pdm_stream_instance *rtd;
u32 period_bytes, buffer_len;
adata = dev_get_drvdata(dev);
if (adata->capture_stream && adata->capture_stream->runtime) {
runtime = adata->capture_stream->runtime;
rtd = runtime->private_data;
period_bytes = frames_to_bytes(runtime, runtime->period_size);
buffer_len = frames_to_bytes(runtime, runtime->buffer_size);
acp63_config_dma(rtd, SNDRV_PCM_STREAM_CAPTURE);
acp63_init_pdm_ring_buffer(PDM_MEM_WINDOW_START, buffer_len,
period_bytes, adata->acp63_base);
}
acp63_enable_pdm_interrupts(adata);
return 0;
}
static int acp63_pdm_suspend(struct device *dev)
{
struct pdm_dev_data *adata;
adata = dev_get_drvdata(dev);
acp63_disable_pdm_interrupts(adata);
return 0;
}
static int acp63_pdm_runtime_resume(struct device *dev)
{
struct pdm_dev_data *adata;
adata = dev_get_drvdata(dev);
acp63_enable_pdm_interrupts(adata);
return 0;
}
static const struct dev_pm_ops acp63_pdm_pm_ops = {
RUNTIME_PM_OPS(acp63_pdm_suspend, acp63_pdm_runtime_resume, NULL)
SYSTEM_SLEEP_PM_OPS(acp63_pdm_suspend, acp63_pdm_resume)
};
static struct platform_driver acp63_pdm_dma_driver = {
.probe = acp63_pdm_audio_probe,
.remove = acp63_pdm_audio_remove,
.driver = {
.name = "acp_ps_pdm_dma",
.pm = pm_ptr(&acp63_pdm_pm_ops),
},
};
module_platform_driver(acp63_pdm_dma_driver);
MODULE_AUTHOR("Syed.SabaKareem@amd.com");
MODULE_DESCRIPTION("AMD common PDM Driver for ACP6.3, ACP7,0 & ACP7.1 platforms");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:" DRV_NAME);
