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linux/sound/soc/amd/acp/acp-i2s.c
Ajit Kumar Pandey 623621a9f9
ASoC: amd: Add common framework to support I2S on ACP SOC 
We are using legacy way of exposing dais and DMA configuration that
requires separate driver modules for various ACP SOC with almost
similar hw configuration. Moreover the legacy approach requires
separate I2S and DMA module platform devices registration and need
machine specific quirk to control various I2S endpoints. Add generic
dai driver and platform driver for I2S controller on ACP hw block.
This common framework can be used by various ACP platform devices
that shares common specs.

Signed-off-by: Ajit Kumar Pandey <AjitKumar.Pandey@amd.com>
Link: https://lore.kernel.org/r/20211019070938.5076-2-AjitKumar.Pandey@amd.com
Signed-off-by: Mark Brown <broonie@kernel.org>
2021-10-20 11:12:49 +01:00

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// SPDX-License-Identifier: (GPL-2.0-only OR BSD-3-Clause)
//
// This file is provided under a dual BSD/GPLv2 license. When using or
// redistributing this file, you may do so under either license.
//
// Copyright(c) 2021 Advanced Micro Devices, Inc.
//
// Authors: Ajit Kumar Pandey <AjitKumar.Pandey@amd.com>
//
/*
* Generic Hardware interface for ACP Audio I2S controller
*/
#include <linux/platform_device.h>
#include <linux/module.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/dma-mapping.h>
#include "amd.h"
#define DRV_NAME "acp_i2s_playcap"
static int acp_i2s_hwparams(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params,
struct snd_soc_dai *dai)
{
struct device *dev = dai->component->dev;
struct acp_dev_data *adata;
u32 val;
u32 xfer_resolution;
u32 reg_val;
adata = snd_soc_dai_get_drvdata(dai);
/* These values are as per Hardware Spec */
switch (params_format(params)) {
case SNDRV_PCM_FORMAT_U8:
case SNDRV_PCM_FORMAT_S8:
xfer_resolution = 0x0;
break;
case SNDRV_PCM_FORMAT_S16_LE:
xfer_resolution = 0x02;
break;
case SNDRV_PCM_FORMAT_S24_LE:
xfer_resolution = 0x04;
break;
case SNDRV_PCM_FORMAT_S32_LE:
xfer_resolution = 0x05;
break;
default:
return -EINVAL;
}
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
switch (dai->driver->id) {
case I2S_BT_INSTANCE:
reg_val = ACP_BTTDM_ITER;
break;
case I2S_SP_INSTANCE:
reg_val = ACP_I2STDM_ITER;
break;
default:
dev_err(dev, "Invalid dai id %x\n", dai->driver->id);
return -EINVAL;
}
} else {
switch (dai->driver->id) {
case I2S_BT_INSTANCE:
reg_val = ACP_BTTDM_IRER;
break;
case I2S_SP_INSTANCE:
reg_val = ACP_I2STDM_IRER;
break;
default:
dev_err(dev, "Invalid dai id %x\n", dai->driver->id);
return -EINVAL;
}
}
val = readl(adata->acp_base + reg_val);
val &= ~ACP3x_ITER_IRER_SAMP_LEN_MASK;
val = val | (xfer_resolution << 3);
writel(val, adata->acp_base + reg_val);
return 0;
}
static int acp_i2s_trigger(struct snd_pcm_substream *substream, int cmd, struct snd_soc_dai *dai)
{
struct acp_stream *stream = substream->runtime->private_data;
struct device *dev = dai->component->dev;
struct acp_dev_data *adata = dev_get_drvdata(dev);
u32 val, period_bytes, reg_val, ier_val, water_val, buf_size, buf_reg;
period_bytes = frames_to_bytes(substream->runtime, substream->runtime->period_size);
buf_size = frames_to_bytes(substream->runtime, substream->runtime->buffer_size);
switch (cmd) {
case SNDRV_PCM_TRIGGER_START:
case SNDRV_PCM_TRIGGER_RESUME:
case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
stream->bytescount = acp_get_byte_count(adata, stream->dai_id, substream->stream);
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
switch (dai->driver->id) {
case I2S_BT_INSTANCE:
water_val = ACP_BT_TX_INTR_WATERMARK_SIZE;
reg_val = ACP_BTTDM_ITER;
ier_val = ACP_BTTDM_IER;
buf_reg = ACP_BT_TX_RINGBUFSIZE;
break;
case I2S_SP_INSTANCE:
water_val = ACP_I2S_TX_INTR_WATERMARK_SIZE;
reg_val = ACP_I2STDM_ITER;
ier_val = ACP_I2STDM_IER;
buf_reg = ACP_I2S_TX_RINGBUFSIZE;
break;
default:
dev_err(dev, "Invalid dai id %x\n", dai->driver->id);
return -EINVAL;
}
} else {
switch (dai->driver->id) {
case I2S_BT_INSTANCE:
water_val = ACP_BT_RX_INTR_WATERMARK_SIZE;
reg_val = ACP_BTTDM_IRER;
ier_val = ACP_BTTDM_IER;
buf_reg = ACP_BT_RX_RINGBUFSIZE;
break;
case I2S_SP_INSTANCE:
water_val = ACP_I2S_RX_INTR_WATERMARK_SIZE;
reg_val = ACP_I2STDM_IRER;
ier_val = ACP_I2STDM_IER;
buf_reg = ACP_I2S_RX_RINGBUFSIZE;
break;
default:
dev_err(dev, "Invalid dai id %x\n", dai->driver->id);
return -EINVAL;
}
}
writel(period_bytes, adata->acp_base + water_val);
writel(buf_size, adata->acp_base + buf_reg);
val = readl(adata->acp_base + reg_val);
val = val | BIT(0);
writel(val, adata->acp_base + reg_val);
writel(1, adata->acp_base + ier_val);
return 0;
case SNDRV_PCM_TRIGGER_STOP:
case SNDRV_PCM_TRIGGER_SUSPEND:
case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
switch (dai->driver->id) {
case I2S_BT_INSTANCE:
reg_val = ACP_BTTDM_ITER;
break;
case I2S_SP_INSTANCE:
reg_val = ACP_I2STDM_ITER;
break;
default:
dev_err(dev, "Invalid dai id %x\n", dai->driver->id);
return -EINVAL;
}
} else {
switch (dai->driver->id) {
case I2S_BT_INSTANCE:
reg_val = ACP_BTTDM_IRER;
break;
case I2S_SP_INSTANCE:
reg_val = ACP_I2STDM_IRER;
break;
default:
dev_err(dev, "Invalid dai id %x\n", dai->driver->id);
return -EINVAL;
}
}
val = readl(adata->acp_base + reg_val);
val = val & ~BIT(0);
writel(val, adata->acp_base + reg_val);
if (!(readl(adata->acp_base + ACP_BTTDM_ITER) & BIT(0)) &&
!(readl(adata->acp_base + ACP_BTTDM_IRER) & BIT(0)))
writel(0, adata->acp_base + ACP_BTTDM_IER);
if (!(readl(adata->acp_base + ACP_I2STDM_ITER) & BIT(0)) &&
!(readl(adata->acp_base + ACP_I2STDM_IRER) & BIT(0)))
writel(0, adata->acp_base + ACP_I2STDM_IER);
return 0;
default:
return -EINVAL;
}
return 0;
}
static int acp_i2s_prepare(struct snd_pcm_substream *substream, struct snd_soc_dai *dai)
{
struct device *dev = dai->component->dev;
struct acp_dev_data *adata = dev_get_drvdata(dev);
struct acp_stream *stream = substream->runtime->private_data;
u32 reg_dma_size = 0, reg_fifo_size = 0, reg_fifo_addr = 0;
u32 phy_addr = 0, acp_fifo_addr = 0, ext_int_ctrl;
unsigned int dir = substream->stream;
switch (dai->driver->id) {
case I2S_SP_INSTANCE:
if (dir == SNDRV_PCM_STREAM_PLAYBACK) {
reg_dma_size = ACP_I2S_TX_DMA_SIZE;
acp_fifo_addr = ACP_SRAM_PTE_OFFSET +
SP_PB_FIFO_ADDR_OFFSET;
reg_fifo_addr = ACP_I2S_TX_FIFOADDR;
reg_fifo_size = ACP_I2S_TX_FIFOSIZE;
phy_addr = I2S_SP_TX_MEM_WINDOW_START + stream->reg_offset;
writel(phy_addr, adata->acp_base + ACP_I2S_TX_RINGBUFADDR);
} else {
reg_dma_size = ACP_I2S_RX_DMA_SIZE;
acp_fifo_addr = ACP_SRAM_PTE_OFFSET +
SP_CAPT_FIFO_ADDR_OFFSET;
reg_fifo_addr = ACP_I2S_RX_FIFOADDR;
reg_fifo_size = ACP_I2S_RX_FIFOSIZE;
phy_addr = I2S_SP_RX_MEM_WINDOW_START + stream->reg_offset;
writel(phy_addr, adata->acp_base + ACP_I2S_RX_RINGBUFADDR);
}
break;
case I2S_BT_INSTANCE:
if (dir == SNDRV_PCM_STREAM_PLAYBACK) {
reg_dma_size = ACP_BT_TX_DMA_SIZE;
acp_fifo_addr = ACP_SRAM_PTE_OFFSET +
BT_PB_FIFO_ADDR_OFFSET;
reg_fifo_addr = ACP_BT_TX_FIFOADDR;
reg_fifo_size = ACP_BT_TX_FIFOSIZE;
phy_addr = I2S_BT_TX_MEM_WINDOW_START + stream->reg_offset;
writel(phy_addr, adata->acp_base + ACP_BT_TX_RINGBUFADDR);
} else {
reg_dma_size = ACP_BT_RX_DMA_SIZE;
acp_fifo_addr = ACP_SRAM_PTE_OFFSET +
BT_CAPT_FIFO_ADDR_OFFSET;
reg_fifo_addr = ACP_BT_RX_FIFOADDR;
reg_fifo_size = ACP_BT_RX_FIFOSIZE;
phy_addr = I2S_BT_TX_MEM_WINDOW_START + stream->reg_offset;
writel(phy_addr, adata->acp_base + ACP_BT_RX_RINGBUFADDR);
}
break;
default:
dev_err(dev, "Invalid dai id %x\n", dai->driver->id);
return -EINVAL;
}
writel(DMA_SIZE, adata->acp_base + reg_dma_size);
writel(acp_fifo_addr, adata->acp_base + reg_fifo_addr);
writel(FIFO_SIZE, adata->acp_base + reg_fifo_size);
ext_int_ctrl = readl(adata->acp_base + ACP_EXTERNAL_INTR_CNTL);
ext_int_ctrl |= BIT(I2S_RX_THRESHOLD) | BIT(BT_RX_THRESHOLD)
| BIT(I2S_TX_THRESHOLD) | BIT(BT_TX_THRESHOLD);
writel(ext_int_ctrl, adata->acp_base + ACP_EXTERNAL_INTR_CNTL);
return 0;
}
static int acp_i2s_startup(struct snd_pcm_substream *substream, struct snd_soc_dai *dai)
{
struct acp_stream *stream = substream->runtime->private_data;
struct device *dev = dai->component->dev;
unsigned int dir = substream->stream;
unsigned int irq_bit = 0;
switch (dai->driver->id) {
case I2S_SP_INSTANCE:
if (dir == SNDRV_PCM_STREAM_PLAYBACK) {
irq_bit = BIT(I2S_TX_THRESHOLD);
stream->pte_offset = ACP_SRAM_SP_PB_PTE_OFFSET;
stream->fifo_offset = SP_PB_FIFO_ADDR_OFFSET;
} else {
irq_bit = BIT(I2S_RX_THRESHOLD);
stream->pte_offset = ACP_SRAM_SP_CP_PTE_OFFSET;
stream->fifo_offset = SP_CAPT_FIFO_ADDR_OFFSET;
}
break;
case I2S_BT_INSTANCE:
if (dir == SNDRV_PCM_STREAM_PLAYBACK) {
irq_bit = BIT(BT_TX_THRESHOLD);
stream->pte_offset = ACP_SRAM_BT_PB_PTE_OFFSET;
stream->fifo_offset = BT_PB_FIFO_ADDR_OFFSET;
} else {
irq_bit = BIT(BT_RX_THRESHOLD);
stream->pte_offset = ACP_SRAM_BT_CP_PTE_OFFSET;
stream->fifo_offset = BT_CAPT_FIFO_ADDR_OFFSET;
}
break;
default:
dev_err(dev, "Invalid dai id %x\n", dai->driver->id);
return -EINVAL;
}
/* Save runtime dai configuration in stream */
stream->id = dai->driver->id + dir;
stream->dai_id = dai->driver->id;
stream->irq_bit = irq_bit;
return 0;
}
const struct snd_soc_dai_ops asoc_acp_cpu_dai_ops = {
.startup = acp_i2s_startup,
.hw_params = acp_i2s_hwparams,
.prepare = acp_i2s_prepare,
.trigger = acp_i2s_trigger,
};
EXPORT_SYMBOL_NS_GPL(asoc_acp_cpu_dai_ops, SND_SOC_ACP_COMMON);
int asoc_acp_i2s_probe(struct snd_soc_dai *dai)
{
struct device *dev = dai->component->dev;
struct acp_dev_data *adata = dev_get_drvdata(dev);
unsigned int val;
if (!adata->acp_base) {
dev_err(dev, "I2S base is NULL\n");
return -EINVAL;
}
val = readl(adata->acp_base + ACP_I2S_PIN_CONFIG);
if (val != I2S_MODE) {
dev_err(dev, "I2S Mode not supported val %x\n", val);
return -EINVAL;
}
return 0;
}
EXPORT_SYMBOL_NS_GPL(asoc_acp_i2s_probe, SND_SOC_ACP_COMMON);
MODULE_LICENSE("Dual BSD/GPL");
MODULE_ALIAS(DRV_NAME);
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