acp5x-i2s.c

// SPDX-License-Identifier: GPL-2.0+
//
// AMD ALSA SoC PCM Driver
//
// Copyright (C) 2021 Advanced Micro Devices, Inc. All rights reserved.

#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 "acp5x.h"

#define DRV_NAME "acp5x_i2s_playcap"

static int acp5x_i2s_set_fmt(struct snd_soc_dai *cpu_dai,
			     unsigned int fmt)
{
	struct i2s_dev_data *adata;
	int mode;

	adata = snd_soc_dai_get_drvdata(cpu_dai);
	mode = fmt & SND_SOC_DAIFMT_FORMAT_MASK;
	switch (mode) {
	case SND_SOC_DAIFMT_I2S:
		adata->tdm_mode = TDM_DISABLE;
		break;
	case SND_SOC_DAIFMT_DSP_A:
		adata->tdm_mode = TDM_ENABLE;
		break;
	default:
		return -EINVAL;
	}
	mode = fmt & SND_SOC_DAIFMT_CLOCK_PROVIDER_MASK;
	switch (mode) {
	case SND_SOC_DAIFMT_BP_FP:
		adata->master_mode = I2S_MASTER_MODE_ENABLE;
		break;
	case SND_SOC_DAIFMT_BC_FC:
		adata->master_mode = I2S_MASTER_MODE_DISABLE;
		break;
	}
	return 0;
}

static int acp5x_i2s_set_tdm_slot(struct snd_soc_dai *cpu_dai,
				  u32 tx_mask, u32 rx_mask,
				  int slots, int slot_width)
{
	struct i2s_dev_data *adata;
	u32 frm_len;
	u16 slot_len;

	adata = snd_soc_dai_get_drvdata(cpu_dai);

	/* These values are as per Hardware Spec */
	switch (slot_width) {
	case SLOT_WIDTH_8:
		slot_len = 8;
		break;
	case SLOT_WIDTH_16:
		slot_len = 16;
		break;
	case SLOT_WIDTH_24:
		slot_len = 24;
		break;
	case SLOT_WIDTH_32:
		slot_len = 0;
		break;
	default:
		return -EINVAL;
	}
	frm_len = FRM_LEN | (slots << 15) | (slot_len << 18);
	adata->tdm_fmt = frm_len;
	return 0;
}

static int acp5x_i2s_hwparams(struct snd_pcm_substream *substream,
			      struct snd_pcm_hw_params *params,
			      struct snd_soc_dai *dai)
{
	struct i2s_stream_instance *rtd;
	struct snd_soc_pcm_runtime *prtd;
	struct snd_soc_card *card;
	struct acp5x_platform_info *pinfo;
	struct i2s_dev_data *adata;

	u32 val;
	u32 reg_val, frmt_reg;
	u32 lrclk_div_val, bclk_div_val;

	lrclk_div_val = 0;
	bclk_div_val = 0;
	prtd = snd_soc_substream_to_rtd(substream);
	rtd = substream->runtime->private_data;
	card = prtd->card;
	adata = snd_soc_dai_get_drvdata(dai);
	pinfo = snd_soc_card_get_drvdata(card);
	if (pinfo) {
		if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
			rtd->i2s_instance = pinfo->play_i2s_instance;
		else
			rtd->i2s_instance = pinfo->cap_i2s_instance;
	}

	/* These values are as per Hardware Spec */
	switch (params_format(params)) {
	case SNDRV_PCM_FORMAT_U8:
	case SNDRV_PCM_FORMAT_S8:
		rtd->xfer_resolution = 0x0;
		break;
	case SNDRV_PCM_FORMAT_S16_LE:
		rtd->xfer_resolution = 0x02;
		break;
	case SNDRV_PCM_FORMAT_S24_LE:
		rtd->xfer_resolution = 0x04;
		break;
	case SNDRV_PCM_FORMAT_S32_LE:
		rtd->xfer_resolution = 0x05;
		break;
	default:
		return -EINVAL;
	}
	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
		switch (rtd->i2s_instance) {
		case I2S_HS_INSTANCE:
			reg_val = ACP_HSTDM_ITER;
			frmt_reg = ACP_HSTDM_TXFRMT;
			break;
		case I2S_SP_INSTANCE:
		default:
			reg_val = ACP_I2STDM_ITER;
			frmt_reg = ACP_I2STDM_TXFRMT;
		}
	} else {
		switch (rtd->i2s_instance) {
		case I2S_HS_INSTANCE:
			reg_val = ACP_HSTDM_IRER;
			frmt_reg = ACP_HSTDM_RXFRMT;
			break;
		case I2S_SP_INSTANCE:
		default:
			reg_val = ACP_I2STDM_IRER;
			frmt_reg = ACP_I2STDM_RXFRMT;
		}
	}
	if (adata->tdm_mode) {
		val = acp_readl(rtd->acp5x_base + reg_val);
		acp_writel(val | 0x2, rtd->acp5x_base + reg_val);
		acp_writel(adata->tdm_fmt, rtd->acp5x_base + frmt_reg);
	}
	val = acp_readl(rtd->acp5x_base + reg_val);
	val &= ~ACP5x_ITER_IRER_SAMP_LEN_MASK;
	val = val | (rtd->xfer_resolution  << 3);
	acp_writel(val, rtd->acp5x_base + reg_val);

	if (adata->master_mode) {
		switch (params_format(params)) {
		case SNDRV_PCM_FORMAT_S16_LE:
			switch (params_rate(params)) {
			case 8000:
				bclk_div_val = 768;
				break;
			case 16000:
				bclk_div_val = 384;
				break;
			case 24000:
				bclk_div_val = 256;
				break;
			case 32000:
				bclk_div_val = 192;
				break;
			case 44100:
			case 48000:
				bclk_div_val = 128;
				break;
			case 88200:
			case 96000:
				bclk_div_val = 64;
				break;
			case 192000:
				bclk_div_val = 32;
				break;
			default:
				return -EINVAL;
			}
			lrclk_div_val = 32;
			break;
		case SNDRV_PCM_FORMAT_S32_LE:
			switch (params_rate(params)) {
			case 8000:
				bclk_div_val = 384;
				break;
			case 16000:
				bclk_div_val = 192;
				break;
			case 24000:
				bclk_div_val = 128;
				break;
			case 32000:
				bclk_div_val = 96;
				break;
			case 44100:
			case 48000:
				bclk_div_val = 64;
				break;
			case 88200:
			case 96000:
				bclk_div_val = 32;
				break;
			case 192000:
				bclk_div_val = 16;
				break;
			default:
				return -EINVAL;
			}
			lrclk_div_val = 64;
			break;
		default:
			return -EINVAL;
		}
		rtd->lrclk_div = lrclk_div_val;
		rtd->bclk_div = bclk_div_val;
	}
	return 0;
}

static int acp5x_i2s_trigger(struct snd_pcm_substream *substream,
			     int cmd, struct snd_soc_dai *dai)
{
	struct i2s_stream_instance *rtd;
	struct i2s_dev_data *adata;
	u32 ret, val, period_bytes, reg_val, ier_val, water_val;
	u32 buf_size, buf_reg;

	adata = snd_soc_dai_get_drvdata(dai);
	rtd = substream->runtime->private_data;
	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:
		rtd->bytescount = acp_get_byte_count(rtd,
						     substream->stream);
		if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
			switch (rtd->i2s_instance) {
			case I2S_HS_INSTANCE:
				water_val =
					ACP_HS_TX_INTR_WATERMARK_SIZE;
				reg_val = ACP_HSTDM_ITER;
				ier_val = ACP_HSTDM_IER;
				buf_reg = ACP_HS_TX_RINGBUFSIZE;
				break;
			case I2S_SP_INSTANCE:
			default:
				water_val =
					ACP_I2S_TX_INTR_WATERMARK_SIZE;
				reg_val = ACP_I2STDM_ITER;
				ier_val = ACP_I2STDM_IER;
				buf_reg = ACP_I2S_TX_RINGBUFSIZE;
			}
		} else {
			switch (rtd->i2s_instance) {
			case I2S_HS_INSTANCE:
				water_val =
					ACP_HS_RX_INTR_WATERMARK_SIZE;
				reg_val = ACP_HSTDM_IRER;
				ier_val = ACP_HSTDM_IER;
				buf_reg = ACP_HS_RX_RINGBUFSIZE;
				break;
			case I2S_SP_INSTANCE:
			default:
				water_val =
					ACP_I2S_RX_INTR_WATERMARK_SIZE;
				reg_val = ACP_I2STDM_IRER;
				ier_val = ACP_I2STDM_IER;
				buf_reg = ACP_I2S_RX_RINGBUFSIZE;
			}
		}
		acp_writel(period_bytes, rtd->acp5x_base + water_val);
		acp_writel(buf_size, rtd->acp5x_base + buf_reg);
		if (adata->master_mode)
			acp5x_set_i2s_clk(adata, rtd);
		val = acp_readl(rtd->acp5x_base + reg_val);
		val = val | BIT(0);
		acp_writel(val, rtd->acp5x_base + reg_val);
		acp_writel(1, rtd->acp5x_base + ier_val);
		ret = 0;
		break;
	case SNDRV_PCM_TRIGGER_STOP:
	case SNDRV_PCM_TRIGGER_SUSPEND:
	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
		if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
			switch (rtd->i2s_instance) {
			case I2S_HS_INSTANCE:
				reg_val = ACP_HSTDM_ITER;
				break;
			case I2S_SP_INSTANCE:
			default:
				reg_val = ACP_I2STDM_ITER;
			}

		} else {
			switch (rtd->i2s_instance) {
			case I2S_HS_INSTANCE:
				reg_val = ACP_HSTDM_IRER;
				break;
			case I2S_SP_INSTANCE:
			default:
				reg_val = ACP_I2STDM_IRER;
			}
		}
		val = acp_readl(rtd->acp5x_base + reg_val);
		val = val & ~BIT(0);
		acp_writel(val, rtd->acp5x_base + reg_val);

		if (!(acp_readl(rtd->acp5x_base + ACP_HSTDM_ITER) & BIT(0)) &&
		    !(acp_readl(rtd->acp5x_base + ACP_HSTDM_IRER) & BIT(0)))
			acp_writel(0, rtd->acp5x_base + ACP_HSTDM_IER);
		if (!(acp_readl(rtd->acp5x_base + ACP_I2STDM_ITER) & BIT(0)) &&
		    !(acp_readl(rtd->acp5x_base + ACP_I2STDM_IRER) & BIT(0)))
			acp_writel(0, rtd->acp5x_base + ACP_I2STDM_IER);
		ret = 0;
		break;
	default:
		ret = -EINVAL;
		break;
	}
	return ret;
}

static const struct snd_soc_dai_ops acp5x_i2s_dai_ops = {
	.hw_params = acp5x_i2s_hwparams,
	.trigger = acp5x_i2s_trigger,
	.set_fmt = acp5x_i2s_set_fmt,
	.set_tdm_slot = acp5x_i2s_set_tdm_slot,
};

static const struct snd_soc_component_driver acp5x_dai_component = {
	.name = "acp5x-i2s",
	.legacy_dai_naming = 1,
};

static struct snd_soc_dai_driver acp5x_i2s_dai = {
	.playback = {
		.rates = SNDRV_PCM_RATE_8000_96000,
		.formats = SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S8 |
			SNDRV_PCM_FMTBIT_U8 | SNDRV_PCM_FMTBIT_S32_LE,
		.channels_min = 2,
		.channels_max = 2,
		.rate_min = 8000,
		.rate_max = 96000,
	},
	.capture = {
		.rates = SNDRV_PCM_RATE_8000_96000,
		.formats = SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S8 |
			SNDRV_PCM_FMTBIT_U8 | SNDRV_PCM_FMTBIT_S32_LE,
		.channels_min = 2,
		.channels_max = 2,
		.rate_min = 8000,
		.rate_max = 96000,
	},
	.ops = &acp5x_i2s_dai_ops,
};

static int acp5x_dai_probe(struct platform_device *pdev)
{
	struct resource *res;
	struct i2s_dev_data *adata;
	int ret;

	adata = devm_kzalloc(&pdev->dev, sizeof(struct i2s_dev_data),
			     GFP_KERNEL);
	if (!adata)
		return -ENOMEM;

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!res) {
		dev_err(&pdev->dev, "IORESOURCE_MEM FAILED\n");
		return -ENOMEM;
	}
	adata->acp5x_base = devm_ioremap(&pdev->dev, res->start,
					 resource_size(res));
	if (!adata->acp5x_base)
		return -ENOMEM;

	adata->master_mode = I2S_MASTER_MODE_ENABLE;
	dev_set_drvdata(&pdev->dev, adata);
	ret = devm_snd_soc_register_component(&pdev->dev,
					      &acp5x_dai_component,
					      &acp5x_i2s_dai, 1);
	if (ret)
		dev_err(&pdev->dev, "Fail to register acp i2s dai\n");
	return ret;
}

static struct platform_driver acp5x_dai_driver = {
	.probe = acp5x_dai_probe,
	.driver = {
		.name = "acp5x_i2s_playcap",
	},
};

module_platform_driver(acp5x_dai_driver);

MODULE_AUTHOR("[email protected]");
MODULE_DESCRIPTION("AMD ACP5.x CPU DAI Driver");
MODULE_ALIAS("platform:" DRV_NAME);
MODULE_LICENSE("GPL v2");