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Date:   Mon, 19 Jun 2023 01:41:48 +0530
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Subject: Re: [PATCH v4 1/3] ASoC: Add support for Loongson I2S controller
Content-Language: en-US
To:     YingKun Meng <mengyingkun@loongson.cn>, broonie@kernel.org,
        lgirdwood@gmail.com
Cc:     krzysztof.kozlowski@linaro.org, linux-kernel@vger.kernel.org,
        alsa-devel@alsa-project.org, loongarch@lists.linux.dev,
        loongson-kernel@lists.loongnix.cn,
        Dan Carpenter <dan.carpenter@linaro.org>,
        Dan Carpenter <error27@gmail.com>,
        kernel-janitors@vger.kernel.org,
        Harshit Mogalapalli <harshit.m.mogalapalli@oracle.com>
References: <20230615122718.3412942-1-mengyingkun@loongson.cn>
From:   Harshit Mogalapalli <harshit.m.mogalapalli@oracle.com>
In-Reply-To: <20230615122718.3412942-1-mengyingkun@loongson.cn>
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Hi YingKun,

On 15/06/23 5:57 pm, YingKun Meng wrote:
> From: Yingkun Meng <mengyingkun@loongson.cn>
> 
> Loongson I2S controller is found on 7axxx/2kxxx chips from loongson,
> it is a PCI device with two private DMA controllers, one for playback,
> the other for capture.
> 
> The driver supports the use of DTS or ACPI to describe device resources.
> 
> Signed-off-by: Yingkun Meng <mengyingkun@loongson.cn>
> ---
> changes v3 -> v4
>    Add __packed attribute for loongson_dma_desc struct.
> 
> sound/soc/Kconfig                     |   1 +
>   sound/soc/Makefile                    |   1 +
>   sound/soc/loongson/Kconfig            |  16 ++
>   sound/soc/loongson/Makefile           |   4 +
>   sound/soc/loongson/loongson_dma.c     | 350 ++++++++++++++++++++++++++
>   sound/soc/loongson/loongson_dma.h     |  16 ++
>   sound/soc/loongson/loongson_i2s.c     | 269 ++++++++++++++++++++
>   sound/soc/loongson/loongson_i2s.h     |  71 ++++++
>   sound/soc/loongson/loongson_i2s_pci.c | 171 +++++++++++++
>   9 files changed, 899 insertions(+)
>   create mode 100644 sound/soc/loongson/Kconfig
>   create mode 100644 sound/soc/loongson/Makefile
>   create mode 100644 sound/soc/loongson/loongson_dma.c
>   create mode 100644 sound/soc/loongson/loongson_dma.h
>   create mode 100644 sound/soc/loongson/loongson_i2s.c
>   create mode 100644 sound/soc/loongson/loongson_i2s.h
>   create mode 100644 sound/soc/loongson/loongson_i2s_pci.c
> 
> diff --git a/sound/soc/Kconfig b/sound/soc/Kconfig
> index 4b6e5a802880..bfa9622e1ab1 100644
> --- a/sound/soc/Kconfig
> +++ b/sound/soc/Kconfig
> @@ -79,6 +79,7 @@ source "sound/soc/google/Kconfig"
>   source "sound/soc/hisilicon/Kconfig"
>   source "sound/soc/jz4740/Kconfig"
>   source "sound/soc/kirkwood/Kconfig"
> +source "sound/soc/loongson/Kconfig"
>   source "sound/soc/img/Kconfig"
>   source "sound/soc/intel/Kconfig"
>   source "sound/soc/mediatek/Kconfig"
> diff --git a/sound/soc/Makefile b/sound/soc/Makefile
> index 9d9b228e4508..8376fdb217ed 100644
> --- a/sound/soc/Makefile
> +++ b/sound/soc/Makefile
> @@ -46,6 +46,7 @@ obj-$(CONFIG_SND_SOC)	+= fsl/
>   obj-$(CONFIG_SND_SOC)	+= google/
>   obj-$(CONFIG_SND_SOC)	+= hisilicon/
>   obj-$(CONFIG_SND_SOC)	+= jz4740/
> +obj-$(CONFIG_SND_SOC)	+= loongson/
>   obj-$(CONFIG_SND_SOC)	+= img/
>   obj-$(CONFIG_SND_SOC)	+= intel/
>   obj-$(CONFIG_SND_SOC)	+= mediatek/
> diff --git a/sound/soc/loongson/Kconfig b/sound/soc/loongson/Kconfig
> new file mode 100644
> index 000000000000..4478ac91e402
> --- /dev/null
> +++ b/sound/soc/loongson/Kconfig
> @@ -0,0 +1,16 @@
> +# SPDX-License-Identifier: GPL-2.0
> +menu "SoC Audio for Loongson CPUs"
> +	depends on LOONGARCH || COMPILE_TEST
> +
> +config SND_SOC_LOONGSON_I2S_PCI
> +	tristate "Loongson I2S-PCI Device Driver"
> +	select REGMAP_MMIO
> +	depends on PCI
> +	help
> +	  Say Y or M if you want to add support for I2S driver for
> +	  Loongson I2S controller.
> +
> +	  The controller is found in loongson bridge chips or SoCs,
> +	  and work as a PCI device.
> +
> +endmenu
> diff --git a/sound/soc/loongson/Makefile b/sound/soc/loongson/Makefile
> new file mode 100644
> index 000000000000..099af7989103
> --- /dev/null
> +++ b/sound/soc/loongson/Makefile
> @@ -0,0 +1,4 @@
> +# SPDX-License-Identifier: GPL-2.0
> +#Platform Support
> +snd-soc-loongson-i2s-pci-objs := loongson_i2s_pci.o loongson_i2s.o loongson_dma.o
> +obj-$(CONFIG_SND_SOC_LOONGSON_I2S_PCI) += snd-soc-loongson-i2s-pci.o
> diff --git a/sound/soc/loongson/loongson_dma.c b/sound/soc/loongson/loongson_dma.c
> new file mode 100644
> index 000000000000..65b6719e61c5
> --- /dev/null
> +++ b/sound/soc/loongson/loongson_dma.c
> @@ -0,0 +1,350 @@
> +// SPDX-License-Identifier: GPL-2.0
> +//
> +// Loongson ALSA SoC Platform (DMA) driver
> +//
> +// Copyright (C) 2023 Loongson Technology Corporation Limited
> +// Author: Yingkun Meng <mengyingkun@loongson.cn>
> +//
> +
> +#include <linux/module.h>
> +#include <linux/io-64-nonatomic-lo-hi.h>
> +#include <linux/delay.h>
> +#include <linux/pm_runtime.h>
> +#include <linux/dma-mapping.h>
> +#include <sound/soc.h>
> +#include <sound/pcm.h>
> +#include <sound/pcm_params.h>
> +#include "loongson_i2s.h"
> +
> +/* DMA dma_order Register */
> +#define DMA_ORDER_STOP          (1 << 4) /* DMA stop */
> +#define DMA_ORDER_START         (1 << 3) /* DMA start */
> +#define DMA_ORDER_ASK_VALID     (1 << 2) /* DMA ask valid flag */
> +#define DMA_ORDER_AXI_UNCO      (1 << 1) /* Uncache access */
> +#define DMA_ORDER_ADDR_64       (1 << 0) /* 64bits address support */
> +
> +#define DMA_ORDER_ASK_MASK      (~0x1fUL) /* Ask addr mask */
> +#define DMA_ORDER_CTRL_MASK     (0x0fUL)  /* Control mask  */
> +
> +/*
> + * DMA registers descriptor.
> + */
> +struct loongson_dma_desc {
> +	u32 order;		/* Next descriptor address register */
> +	u32 saddr;		/* Source address register */
> +	u32 daddr;		/* Device address register */
> +	u32 length;		/* Total length register */
> +	u32 step_length;	/* Memory stride register */
> +	u32 step_times;		/* Repeat time register */
> +	u32 cmd;		/* Command register */
> +	u32 stats;		/* Status register */
> +	u32 order_hi;		/* Next descriptor high address register */
> +	u32 saddr_hi;		/* High source address register */
> +	u32 res[6];		/* Reserved */
> +} __packed;
> +
> +struct loongson_runtime_data {
> +	struct loongson_dma_data *dma_data;
> +
> +	struct loongson_dma_desc *dma_desc_arr;
> +	dma_addr_t dma_desc_arr_phy;
> +	int dma_desc_arr_size;
> +
> +	struct loongson_dma_desc *dma_pos_desc;
> +	dma_addr_t dma_pos_desc_phy;
> +};
> +
> +static const struct snd_pcm_hardware ls_pcm_hardware = {
> +	.info = SNDRV_PCM_INFO_MMAP |
> +		SNDRV_PCM_INFO_INTERLEAVED |
> +		SNDRV_PCM_INFO_MMAP_VALID |
> +		SNDRV_PCM_INFO_RESUME |
> +		SNDRV_PCM_INFO_PAUSE,
> +	.formats = (SNDRV_PCM_FMTBIT_S8 |
> +		SNDRV_PCM_FMTBIT_S16_LE |
> +		SNDRV_PCM_FMTBIT_S20_3LE |
> +		SNDRV_PCM_FMTBIT_S24_LE),
> +	.period_bytes_min = 128,
> +	.period_bytes_max = 128 * 1024,
> +	.periods_min = 1,
> +	.periods_max = PAGE_SIZE / sizeof(struct loongson_dma_desc),
> +	.buffer_bytes_max = 1024 * 1024,
> +};
> +
> +static struct
> +loongson_dma_desc *dma_desc_save(struct loongson_runtime_data *prtd)
> +{
> +	void __iomem *order_reg = prtd->dma_data->order_addr;
> +	u64 val;
> +
> +	val = (u64)prtd->dma_pos_desc_phy & DMA_ORDER_ASK_MASK;
> +	val |= (readq(order_reg) & DMA_ORDER_CTRL_MASK);
> +	val |= DMA_ORDER_ASK_VALID;
> +	writeq(val, order_reg);
> +
> +	while (readl(order_reg) & DMA_ORDER_ASK_VALID)
> +		udelay(2);
> +
> +	return prtd->dma_pos_desc;
> +}
> +
> +static int loongson_pcm_trigger(struct snd_soc_component *component,
> +				struct snd_pcm_substream *substream, int cmd)
> +{
> +	struct loongson_runtime_data *prtd = substream->runtime->private_data;
> +	struct device *dev = substream->pcm->card->dev;
> +	void __iomem *order_reg = prtd->dma_data->order_addr;
> +	u64 val;
> +	int ret = 0;
> +
> +	switch (cmd) {
> +	case SNDRV_PCM_TRIGGER_START:
> +	case SNDRV_PCM_TRIGGER_RESUME:
> +	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
> +		val = prtd->dma_pos_desc_phy & DMA_ORDER_ASK_MASK;
> +		if (dev->coherent_dma_mask == DMA_BIT_MASK(64))
> +			val |= DMA_ORDER_ADDR_64;
> +		else
> +			val &= ~DMA_ORDER_ADDR_64;
> +		val |= (readq(order_reg) & DMA_ORDER_CTRL_MASK);
> +		val |= DMA_ORDER_START;
> +		writeq(val, order_reg);
> +
> +		while ((readl(order_reg) & DMA_ORDER_START))
> +			udelay(2);
> +		break;
> +	case SNDRV_PCM_TRIGGER_STOP:
> +	case SNDRV_PCM_TRIGGER_SUSPEND:
> +	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
> +		dma_desc_save(prtd);
> +
> +		/* dma stop */
> +		val = readq(order_reg) | DMA_ORDER_STOP;
> +		writeq(val, order_reg);
> +		udelay(1000);
> +
> +		break;
> +	default:
> +		dev_err(dev, "Invalid pcm trigger operation\n");
> +		return -EINVAL;
> +	}
> +
> +	return ret;
> +}
> +
> +static int loongson_pcm_hw_params(struct snd_soc_component *component,
> +				  struct snd_pcm_substream *substream,
> +				  struct snd_pcm_hw_params *params)
> +{
> +	struct snd_pcm_runtime *runtime = substream->runtime;
> +	struct device *dev = substream->pcm->card->dev;
> +	struct loongson_runtime_data *prtd = runtime->private_data;
> +	size_t buf_len = params_buffer_bytes(params);
> +	size_t period_len = params_period_bytes(params);
> +	dma_addr_t order_addr, mem_addr;
> +	struct loongson_dma_desc *desc;
> +	u32 num_periods;
> +	int i;
> +
> +	if (buf_len % period_len) {
> +		dev_err(dev, "buf len not multiply of period len\n");
> +		return -EINVAL;
> +	}
> +
> +	num_periods = buf_len / period_len;
> +	if (!num_periods || num_periods > prtd->dma_desc_arr_size) {
> +		dev_err(dev, "dma data too small or too big\n");
> +		return -EINVAL;
> +	}
> +
> +	snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
> +	runtime->dma_bytes = buf_len;
> +
> +	/* initialize dma descriptor array */
> +	mem_addr = runtime->dma_addr;
> +	order_addr = prtd->dma_desc_arr_phy;
> +	for (i = 0; i < num_periods; i++) {
> +		desc = &prtd->dma_desc_arr[i];
> +
> +		/* next descriptor physical address */
> +		order_addr += sizeof(*desc);
> +		desc->order = lower_32_bits(order_addr | BIT(0));
> +		desc->order_hi = upper_32_bits(order_addr);
> +
> +		desc->saddr = lower_32_bits(mem_addr);
> +		desc->saddr_hi = upper_32_bits(mem_addr);
> +		desc->daddr = prtd->dma_data->dev_addr;
> +
> +		desc->cmd = BIT(0);
> +		if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
> +			desc->cmd |= BIT(12);
> +
> +		desc->length = period_len >> 2;
> +		desc->step_length = 0;
> +		desc->step_times = 1;
> +
> +		mem_addr += period_len;
> +	}
> +	desc = &prtd->dma_desc_arr[num_periods - 1];
> +	desc->order = lower_32_bits(prtd->dma_desc_arr_phy | BIT(0));
> +	desc->order_hi = upper_32_bits(prtd->dma_desc_arr_phy);
> +
> +	/* init position descriptor */
> +	*prtd->dma_pos_desc = *prtd->dma_desc_arr;
> +
> +	return 0;
> +}
> +
> +static snd_pcm_uframes_t
> +loongson_pcm_pointer(struct snd_soc_component *component,
> +		     struct snd_pcm_substream *substream)
> +{
> +	struct snd_pcm_runtime *runtime = substream->runtime;
> +	struct loongson_runtime_data *prtd = runtime->private_data;
> +	struct loongson_dma_desc *desc;
> +	snd_pcm_uframes_t x;
> +	u64 addr;
> +
> +	desc = dma_desc_save(prtd);
> +	addr = ((u64)desc->saddr_hi << 32) | desc->saddr;
> +
> +	x = bytes_to_frames(runtime, addr - runtime->dma_addr);
> +	if (x == runtime->buffer_size)
> +		x = 0;
> +	return x;
> +}
> +
> +static irqreturn_t loongson_pcm_dma_irq(int irq, void *devid)
> +{
> +	struct snd_pcm_substream *substream = devid;
> +
> +	snd_pcm_period_elapsed(substream);
> +	return IRQ_HANDLED;
> +}
> +
> +static int loongson_pcm_open(struct snd_soc_component *component,
> +			     struct snd_pcm_substream *substream)
> +{
> +	struct snd_pcm_runtime *runtime = substream->runtime;
> +	struct snd_soc_pcm_runtime *rtd = substream->private_data;
> +	struct snd_card *card = substream->pcm->card;
> +	struct loongson_runtime_data *prtd;
> +	struct loongson_dma_data *dma_data;
> +	int ret;
> +
> +	/*
> +	 * For mysterious reasons (and despite what the manual says)
> +	 * playback samples are lost if the DMA count is not a multiple
> +	 * of the DMA burst size.  Let's add a rule to enforce that.
> +	 */
> +	snd_pcm_hw_constraint_step(runtime, 0,
> +				   SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 128);
> +	snd_pcm_hw_constraint_step(runtime, 0,
> +				   SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 128);
> +	snd_pcm_hw_constraint_integer(substream->runtime,
> +				      SNDRV_PCM_HW_PARAM_PERIODS);
> +	snd_soc_set_runtime_hwparams(substream, &ls_pcm_hardware);
> +
> +	prtd = kzalloc(sizeof(*prtd), GFP_KERNEL);
> +	if (!prtd)
> +		return -ENOMEM;
> +
> +	prtd->dma_desc_arr = dma_alloc_coherent(card->dev, PAGE_SIZE,
> +						&prtd->dma_desc_arr_phy,
> +						GFP_KERNEL);
> +	if (!prtd->dma_desc_arr) {
> +		ret = -ENOMEM;
> +		goto desc_err;
> +	}
> +	prtd->dma_desc_arr_size = PAGE_SIZE / sizeof(*prtd->dma_desc_arr);
> +
> +	prtd->dma_pos_desc = dma_alloc_coherent(card->dev,
> +						sizeof(*prtd->dma_pos_desc),
> +						&prtd->dma_pos_desc_phy,
> +						GFP_KERNEL);
> +	if (!prtd->dma_pos_desc) {
> +		ret = -ENOMEM;
> +		goto pos_err;
> +	}
> +
> +	dma_data = snd_soc_dai_get_dma_data(asoc_rtd_to_cpu(rtd, 0), substream);
> +	prtd->dma_data = dma_data;
> +
> +	substream->runtime->private_data = prtd;
> +
> +	return 0;
> +pos_err:
> +	dma_free_coherent(card->dev, PAGE_SIZE, prtd->dma_desc_arr,
> +			  prtd->dma_desc_arr_phy);
> +desc_err:
> +	kfree(prtd);
> +
> +	return ret;
> +}
> +
> +static int loongson_pcm_close(struct snd_soc_component *component,
> +			      struct snd_pcm_substream *substream)
> +{
> +	struct snd_card *card = substream->pcm->card;
> +	struct loongson_runtime_data *prtd = substream->runtime->private_data;
> +
> +	dma_free_coherent(card->dev, PAGE_SIZE, prtd->dma_desc_arr,
> +			  prtd->dma_desc_arr_phy);
> +
> +	dma_free_coherent(card->dev, sizeof(*prtd->dma_pos_desc),
> +			  prtd->dma_pos_desc, prtd->dma_pos_desc_phy);
> +
> +	kfree(prtd);
> +	return 0;
> +}
> +
> +static int loongson_pcm_mmap(struct snd_soc_component *component,
> +			     struct snd_pcm_substream *substream,
> +			     struct vm_area_struct *vma)
> +{
> +	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 loongson_pcm_new(struct snd_soc_component *component,
> +			    struct snd_soc_pcm_runtime *rtd)
> +{
> +	struct snd_card *card = rtd->card->snd_card;
> +	struct snd_pcm_substream *substream;
> +	struct loongson_dma_data *dma_data;
> +	unsigned int i;
> +	int ret;
> +
> +	for_each_pcm_streams(i) {
> +		substream = rtd->pcm->streams[i].substream;
> +		if (!substream)
> +			continue;
> +
> +		dma_data = snd_soc_dai_get_dma_data(asoc_rtd_to_cpu(rtd, 0),
> +						    substream);
> +		ret = devm_request_irq(card->dev, dma_data->irq,
> +				       loongson_pcm_dma_irq,
> +				       IRQF_TRIGGER_HIGH, LS_I2S_DRVNAME,
> +				       substream);
> +		if (ret < 0) {
> +			dev_err(card->dev, "request irq for DMA failed\n");
> +			return ret;
> +		}
> +	}
> +
> +	return snd_pcm_set_fixed_buffer_all(rtd->pcm, SNDRV_DMA_TYPE_DEV,
> +					    card->dev,
> +					    ls_pcm_hardware.buffer_bytes_max);
> +}
> +
> +const struct snd_soc_component_driver loongson_i2s_component = {
> +	.name		= LS_I2S_DRVNAME,
> +	.open		= loongson_pcm_open,
> +	.close		= loongson_pcm_close,
> +	.hw_params	= loongson_pcm_hw_params,
> +	.trigger	= loongson_pcm_trigger,
> +	.pointer	= loongson_pcm_pointer,
> +	.mmap		= loongson_pcm_mmap,
> +	.pcm_construct	= loongson_pcm_new,
> +};
> diff --git a/sound/soc/loongson/loongson_dma.h b/sound/soc/loongson/loongson_dma.h
> new file mode 100644
> index 000000000000..073ee8c0c046
> --- /dev/null
> +++ b/sound/soc/loongson/loongson_dma.h
> @@ -0,0 +1,16 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/*
> + * ALSA ASoC interface for the Loongson platform
> + *
> + * Copyright (C) 2023 Loongson Technology Corporation Limited
> + * Author: Yingkun Meng <mengyingkun@loongson.cn>
> + */
> +
> +#ifndef _LOONGSON_DMA_H
> +#define _LOONGSON_DMA_H
> +
> +#include <sound/soc.h>
> +
> +extern const struct snd_soc_component_driver loongson_i2s_component;
> +
> +#endif
> diff --git a/sound/soc/loongson/loongson_i2s.c b/sound/soc/loongson/loongson_i2s.c
> new file mode 100644
> index 000000000000..35d34568be79
> --- /dev/null
> +++ b/sound/soc/loongson/loongson_i2s.c
> @@ -0,0 +1,269 @@
> +// SPDX-License-Identifier: GPL-2.0
> +//
> +// Common functions for loongson I2S controller driver
> +//
> +// Copyright (C) 2023 Loongson Technology Corporation Limited.
> +// Author: Yingkun Meng <mengyingkun@loongson.cn>
> +//
> +
> +#include <linux/module.h>
> +#include <linux/platform_device.h>
> +#include <linux/delay.h>
> +#include <linux/pm_runtime.h>
> +#include <linux/dma-mapping.h>
> +#include <sound/soc.h>
> +#include <linux/regmap.h>
> +#include <sound/pcm_params.h>
> +#include "loongson_i2s.h"
> +
> +#define LOONGSON_I2S_FORMATS (SNDRV_PCM_FMTBIT_S8 | \
> +			SNDRV_PCM_FMTBIT_S16_LE | \
> +			SNDRV_PCM_FMTBIT_S20_3LE | \
> +			SNDRV_PCM_FMTBIT_S24_LE)
> +
> +static int loongson_i2s_trigger(struct snd_pcm_substream *substream, int cmd,
> +				struct snd_soc_dai *dai)
> +{
> +	struct loongson_i2s *i2s = snd_soc_dai_get_drvdata(dai);
> +	int ret = 0;
> +
> +	switch (cmd) {
> +	case SNDRV_PCM_TRIGGER_START:
> +	case SNDRV_PCM_TRIGGER_RESUME:
> +	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
> +		if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
> +			regmap_update_bits(i2s->regmap, LS_I2S_CTRL,
> +					   I2S_CTRL_TX_EN | I2S_CTRL_TX_DMA_EN,
> +					   I2S_CTRL_TX_EN | I2S_CTRL_TX_DMA_EN);
> +		else
> +			regmap_update_bits(i2s->regmap, LS_I2S_CTRL,
> +					   I2S_CTRL_RX_EN | I2S_CTRL_RX_DMA_EN,
> +					   I2S_CTRL_RX_EN | I2S_CTRL_RX_DMA_EN);
> +		break;
> +	case SNDRV_PCM_TRIGGER_STOP:
> +	case SNDRV_PCM_TRIGGER_SUSPEND:
> +	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
> +		if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
> +			regmap_update_bits(i2s->regmap, LS_I2S_CTRL,
> +					I2S_CTRL_TX_EN | I2S_CTRL_TX_DMA_EN, 0);
> +		else
> +			regmap_update_bits(i2s->regmap, LS_I2S_CTRL,
> +					I2S_CTRL_RX_EN | I2S_CTRL_RX_DMA_EN, 0);
> +		break;
> +	default:
> +		ret = -EINVAL;
> +	}
> +
> +	return ret;
> +}
> +
> +static int loongson_i2s_hw_params(struct snd_pcm_substream *substream,
> +				  struct snd_pcm_hw_params *params,
> +				  struct snd_soc_dai *dai)
> +{
> +	struct loongson_i2s *i2s = snd_soc_dai_get_drvdata(dai);
> +	u32 clk_rate = i2s->clk_rate;
> +	u32 sysclk = i2s->sysclk;
> +	u32 bits = params_width(params);
> +	u32 chans = params_channels(params);
> +	u32 fs = params_rate(params);
> +	u32 bclk_ratio, mclk_ratio;
> +	u32 mclk_ratio_frac;
> +	u32 val = 0;
> +
> +	switch (i2s->rev_id) {
> +	case 0:
> +		bclk_ratio = DIV_ROUND_CLOSEST(clk_rate,
> +					       (bits * chans * fs * 2)) - 1;
> +		mclk_ratio = DIV_ROUND_CLOSEST(clk_rate, (sysclk * 2)) - 1;
> +
> +		/* According to 2k1000LA user manual, set bits == depth */
> +		val |= (bits << 24);
> +		val |= (bits << 16);
> +		val |= (bclk_ratio << 8);
> +		val |= mclk_ratio;
> +		regmap_write(i2s->regmap, LS_I2S_CFG, val);
> +
> +		break;
> +	case 1:
> +		bclk_ratio = DIV_ROUND_CLOSEST(sysclk,
> +					       (bits * chans * fs * 2)) - 1;
> +		mclk_ratio = clk_rate / sysclk;
> +		mclk_ratio_frac = DIV_ROUND_CLOSEST(((u64)clk_rate << 16),
> +						    sysclk) - (mclk_ratio << 16);
> +
> +		regmap_read(i2s->regmap, LS_I2S_CFG, &val);
> +		val |= (bits << 24);
> +		val |= (bclk_ratio << 8);
> +		if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
> +			val |= (bits << 16);
> +		else
> +			val |= bits;
> +		regmap_write(i2s->regmap, LS_I2S_CFG, val);
> +
> +		val = (mclk_ratio_frac << 16) | mclk_ratio;
> +		regmap_write(i2s->regmap, LS_I2S_CFG1, val);
> +
> +		break;
> +	default:
> +		dev_err(i2s->dev, "I2S revision invalid\n");
> +		return -EINVAL;
> +	}
> +
> +	return 0;
> +}
> +
> +static int loongson_i2s_set_dai_sysclk(struct snd_soc_dai *dai, int clk_id,
> +				       unsigned int freq, int dir)
> +{
> +	struct loongson_i2s *i2s = snd_soc_dai_get_drvdata(dai);
> +
> +	i2s->sysclk = freq;
> +
> +	return 0;
> +}
> +
> +static int loongson_i2s_set_fmt(struct snd_soc_dai *dai, unsigned int fmt)
> +{
> +	struct loongson_i2s *i2s = snd_soc_dai_get_drvdata(dai);
> +	u32 val;
> +	int ret;
> +
> +	switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
> +	case SND_SOC_DAIFMT_I2S:
> +		break;
> +	case SND_SOC_DAIFMT_RIGHT_J:
> +		regmap_update_bits(i2s->regmap, LS_I2S_CTRL, I2S_CTRL_MSB,
> +				   I2S_CTRL_MSB);
> +		break;
> +	default:
> +		return -EINVAL;
> +	}
> +
> +
> +	switch (fmt & SND_SOC_DAIFMT_CLOCK_PROVIDER_MASK) {
> +	case SND_SOC_DAIFMT_BC_FC:
> +		break;
> +	case SND_SOC_DAIFMT_BP_FC:
> +		/* Enable master mode */
> +		regmap_update_bits(i2s->regmap, LS_I2S_CTRL, I2S_CTRL_MASTER,
> +				   I2S_CTRL_MASTER);
> +		if (i2s->rev_id == 1) {
> +			ret = regmap_read_poll_timeout_atomic(i2s->regmap,
> +						LS_I2S_CTRL, val,
> +						val & I2S_CTRL_CLK_READY,
> +						10, 500000);
> +			if (ret < 0)
> +				dev_warn(dai->dev, "wait BCLK ready timeout\n");
> +		}
> +		break;
> +	case SND_SOC_DAIFMT_BC_FP:
> +		/* Enable MCLK */
> +		if (i2s->rev_id == 1) {
> +			regmap_update_bits(i2s->regmap, LS_I2S_CTRL,
> +					   I2S_CTRL_MCLK_EN,
> +					   I2S_CTRL_MCLK_EN);
> +			ret = regmap_read_poll_timeout_atomic(i2s->regmap,
> +						LS_I2S_CTRL, val,
> +						val & I2S_CTRL_MCLK_READY,
> +						10, 500000);
> +			if (ret < 0)
> +				dev_warn(dai->dev, "wait MCLK ready timeout\n");
> +		}
> +		break;
> +	case SND_SOC_DAIFMT_BP_FP:
> +		/* Enable MCLK */
> +		if (i2s->rev_id == 1) {
> +			regmap_update_bits(i2s->regmap, LS_I2S_CTRL,
> +					   I2S_CTRL_MCLK_EN,
> +					   I2S_CTRL_MCLK_EN);
> +			ret = regmap_read_poll_timeout_atomic(i2s->regmap,
> +						LS_I2S_CTRL, val,
> +						val & I2S_CTRL_MCLK_READY,
> +						10, 500000);
> +			if (ret < 0)
> +				dev_warn(dai->dev, "wait MCLK ready timeout\n");
> +		}
> +
> +		/* Enable master mode */
> +		regmap_update_bits(i2s->regmap, LS_I2S_CTRL, I2S_CTRL_MASTER,
> +				   I2S_CTRL_MASTER);
> +		if (i2s->rev_id == 1) {
> +			ret = regmap_read_poll_timeout_atomic(i2s->regmap,
> +						LS_I2S_CTRL, val,
> +						val & I2S_CTRL_CLK_READY,
> +						10, 500000);
> +			if (ret < 0)
> +				dev_warn(dai->dev, "wait BCLK ready timeout\n");
> +		}
> +		break;
> +	default:
> +		return -EINVAL;
> +	}
> +
> +	return 0;
> +}
> +
> +static const struct snd_soc_dai_ops loongson_i2s_dai_ops = {
> +	.trigger	= loongson_i2s_trigger,
> +	.hw_params	= loongson_i2s_hw_params,
> +	.set_sysclk	= loongson_i2s_set_dai_sysclk,
> +	.set_fmt	= loongson_i2s_set_fmt,
> +};
> +
> +static int loongson_i2s_dai_probe(struct snd_soc_dai *cpu_dai)
> +{
> +	struct loongson_i2s *i2s = dev_get_drvdata(cpu_dai->dev);
> +
> +	snd_soc_dai_init_dma_data(cpu_dai, &i2s->playback_dma_data,
> +				  &i2s->capture_dma_data);
> +	snd_soc_dai_set_drvdata(cpu_dai, i2s);
> +
> +	return 0;
> +}
> +
> +struct snd_soc_dai_driver loongson_i2s_dai = {
> +	.name = "loongson-i2s",
> +	.probe = loongson_i2s_dai_probe,
> +	.playback = {
> +		.stream_name = "CPU-Playback",
> +		.channels_min = 1,
> +		.channels_max = 2,
> +		.rates = SNDRV_PCM_RATE_8000_96000,
> +		.formats = LOONGSON_I2S_FORMATS,
> +	},
> +	.capture = {
> +		.stream_name = "CPU-Capture",
> +		.channels_min = 1,
> +		.channels_max = 2,
> +		.rates = SNDRV_PCM_RATE_8000_96000,
> +		.formats = LOONGSON_I2S_FORMATS,
> +	},
> +	.ops = &loongson_i2s_dai_ops,
> +	.symmetric_rate = 1,
> +};
> +
> +static int i2s_suspend(struct device *dev)
> +{
> +	struct loongson_i2s *i2s = dev_get_drvdata(dev);
> +
> +	regcache_cache_only(i2s->regmap, true);
> +
> +	return 0;
> +}
> +
> +static int i2s_resume(struct device *dev)
> +{
> +	struct loongson_i2s *i2s = dev_get_drvdata(dev);
> +	int ret;
> +
> +	regcache_cache_only(i2s->regmap, false);
> +	regcache_mark_dirty(i2s->regmap);
> +	ret = regcache_sync(i2s->regmap);
> +
> +	return ret;
> +}
> +
> +const struct dev_pm_ops loongson_i2s_pm = {
> +	SET_SYSTEM_SLEEP_PM_OPS(i2s_suspend, i2s_resume)
> +};
> diff --git a/sound/soc/loongson/loongson_i2s.h b/sound/soc/loongson/loongson_i2s.h
> new file mode 100644
> index 000000000000..52788f6a94ad
> --- /dev/null
> +++ b/sound/soc/loongson/loongson_i2s.h
> @@ -0,0 +1,71 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/*
> + * ALSA I2S interface for the Loongson platform
> + *
> + * Copyright (C) 2023 Loongson Technology Corporation Limited
> + * Author: Yingkun Meng <mengyingkun@loongson.cn>
> + */
> +
> +#ifndef _LOONGSON_I2S_H
> +#define _LOONGSON_I2S_H
> +
> +#include <linux/regmap.h>
> +#include <sound/dmaengine_pcm.h>
> +
> +/* I2S Common Registers */
> +#define LS_I2S_VER	0x00 /* I2S Version */
> +#define LS_I2S_CFG	0x04 /* I2S Config */
> +#define LS_I2S_CTRL	0x08 /* I2S Control */
> +#define LS_I2S_RX_DATA	0x0C /* I2S DMA RX Address */
> +#define LS_I2S_TX_DATA	0x10 /* I2S DMA TX Address */
> +
> +/* 2K2000 I2S Specify Registers */
> +#define LS_I2S_CFG1	0x14 /* I2S Config1 */
> +
> +/* 7A2000 I2S Specify Registers */
> +#define LS_I2S_TX_ORDER	0x100 /* TX DMA Order */
> +#define LS_I2S_RX_ORDER 0x110 /* RX DMA Order */
> +
> +/* Loongson I2S Control Register */
> +#define I2S_CTRL_MCLK_READY	(1 << 16) /* MCLK ready */
> +#define I2S_CTRL_MASTER		(1 << 15) /* Master mode */
> +#define I2S_CTRL_MSB		(1 << 14) /* MSB bit order */
> +#define I2S_CTRL_RX_EN		(1 << 13) /* RX enable */
> +#define I2S_CTRL_TX_EN		(1 << 12) /* TX enable */
> +#define I2S_CTRL_RX_DMA_EN	(1 << 11) /* DMA RX enable */
> +#define I2S_CTRL_CLK_READY	(1 << 8)  /* BCLK ready */
> +#define I2S_CTRL_TX_DMA_EN	(1 << 7)  /* DMA TX enable */
> +#define I2S_CTRL_RESET		(1 << 4)  /* Controller soft reset */
> +#define I2S_CTRL_MCLK_EN	(1 << 3)  /* Enable MCLK */
> +#define I2S_CTRL_RX_INT_EN	(1 << 1)  /* RX interrupt enable */
> +#define I2S_CTRL_TX_INT_EN	(1 << 0)  /* TX interrupt enable */
> +
> +#define LS_I2S_DRVNAME		"loongson-i2s"
> +
> +struct loongson_dma_data {
> +	dma_addr_t dev_addr;		/* device physical address for DMA */
> +	void __iomem *order_addr;	/* DMA order register */
> +	u32 irq;			/* DMA irq */
> +};
> +
> +struct loongson_i2s {
> +	struct device *dev;
> +	union {
> +		struct snd_dmaengine_dai_dma_data playback_dma_data;
> +		struct loongson_dma_data tx_dma_data;
> +	};
> +	union {
> +		struct snd_dmaengine_dai_dma_data capture_dma_data;
> +		struct loongson_dma_data rx_dma_data;
> +	};
> +	struct regmap *regmap;
> +	void __iomem *reg_base;
> +	u32 rev_id;
> +	u32 clk_rate;
> +	u32 sysclk;
> +};
> +
> +extern const struct dev_pm_ops loongson_i2s_pm;
> +extern struct snd_soc_dai_driver loongson_i2s_dai;
> +
> +#endif
> diff --git a/sound/soc/loongson/loongson_i2s_pci.c b/sound/soc/loongson/loongson_i2s_pci.c
> new file mode 100644
> index 000000000000..6dcfb17d3276
> --- /dev/null
> +++ b/sound/soc/loongson/loongson_i2s_pci.c
> @@ -0,0 +1,171 @@
> +// SPDX-License-Identifier: GPL-2.0
> +//
> +// loongson_i2s_pci.c -- Loongson I2S controller driver
> +//
> +// Copyright (C) 2023 Loongson Technology Corporation Limited
> +// Author: Yingkun Meng <mengyingkun@loongson.cn>
> +//
> +
> +#include <linux/module.h>
> +#include <linux/delay.h>
> +#include <linux/pm_runtime.h>
> +#include <linux/dma-mapping.h>
> +#include <linux/acpi.h>
> +#include <linux/pci.h>
> +#include <sound/soc.h>
> +#include "loongson_i2s.h"
> +#include "loongson_dma.h"
> +
> +static bool loongson_i2s_wr_reg(struct device *dev, unsigned int reg)
> +{
> +	switch (reg) {
> +	case LS_I2S_CFG:
> +	case LS_I2S_CTRL:
> +	case LS_I2S_RX_DATA:
> +	case LS_I2S_TX_DATA:
> +	case LS_I2S_CFG1:
> +		return true;
> +	default:
> +		return false;
> +	};
> +}
> +
> +static bool loongson_i2s_rd_reg(struct device *dev, unsigned int reg)
> +{
> +	switch (reg) {
> +	case LS_I2S_VER:
> +	case LS_I2S_CFG:
> +	case LS_I2S_CTRL:
> +	case LS_I2S_RX_DATA:
> +	case LS_I2S_TX_DATA:
> +	case LS_I2S_CFG1:
> +		return true;
> +	default:
> +		return false;
> +	};
> +}
> +
> +static bool loongson_i2s_volatile_reg(struct device *dev, unsigned int reg)
> +{
> +	switch (reg) {
> +	case LS_I2S_CFG:
> +	case LS_I2S_CTRL:
> +	case LS_I2S_RX_DATA:
> +	case LS_I2S_TX_DATA:
> +	case LS_I2S_CFG1:
> +		return true;
> +	default:
> +		return false;
> +	};
> +}
> +
> +static const struct regmap_config loongson_i2s_regmap_config = {
> +	.reg_bits = 32,
> +	.reg_stride = 4,
> +	.val_bits = 32,
> +	.max_register = LS_I2S_CFG1,
> +	.writeable_reg = loongson_i2s_wr_reg,
> +	.readable_reg = loongson_i2s_rd_reg,
> +	.volatile_reg = loongson_i2s_volatile_reg,
> +	.cache_type = REGCACHE_FLAT,
> +};
> +
> +static int loongson_i2s_pci_probe(struct pci_dev *pdev,
> +				  const struct pci_device_id *pid)
> +{
> +	const struct fwnode_handle *fwnode = pdev->dev.fwnode;
> +	struct loongson_dma_data *tx_data, *rx_data;
> +	struct loongson_i2s *i2s;
> +	int ret;
> +
> +	if (pcim_enable_device(pdev)) {
> +		dev_err(&pdev->dev, "pci_enable_device failed\n");
> +		return -ENODEV;
> +	}
> +
> +	i2s = devm_kzalloc(&pdev->dev, sizeof(*i2s), GFP_KERNEL);
> +	if (!i2s)
> +		return -ENOMEM;
> +
> +	i2s->rev_id = pdev->revision;
> +	i2s->dev = &pdev->dev;
> +	pci_set_drvdata(pdev, i2s);
> +
> +	ret = pcim_iomap_regions(pdev, 1 << 0, dev_name(&pdev->dev));
> +	if (ret < 0) {
> +		dev_err(&pdev->dev, "iomap_regions failed\n");
> +		return ret;
> +	}
> +	i2s->reg_base = pcim_iomap_table(pdev)[0];
> +	i2s->regmap = devm_regmap_init_mmio(&pdev->dev, i2s->reg_base,
> +					    &loongson_i2s_regmap_config);
> +	if (IS_ERR(i2s->regmap)) {
> +		dev_err(&pdev->dev, "regmap_init_mmio failed\n");
> +		return PTR_ERR(i2s->regmap);
> +	}
> +
> +	tx_data = &i2s->tx_dma_data;
> +	rx_data = &i2s->rx_dma_data;
> +
> +	tx_data->dev_addr = (dma_addr_t)i2s->reg_base + LS_I2S_TX_DATA;
> +	tx_data->order_addr = i2s->reg_base + LS_I2S_TX_ORDER;
> +
> +	rx_data->dev_addr = (dma_addr_t)i2s->reg_base + LS_I2S_RX_DATA;
> +	rx_data->order_addr = i2s->reg_base + LS_I2S_RX_ORDER;
> +
> +	tx_data->irq = fwnode_irq_get_byname(fwnode, "tx");

Smatch detects that tx_data->irq and rx_data->irq are of type 
u32(unsigned) so they can never be negative.

> +	if (tx_data->irq < 0) {
		    ^^^^^^^^ This can never be true.

Should irq be of type 'int' instead?

> +		dev_err(&pdev->dev, "dma tx irq invalid\n");
> +		return tx_data->irq;
> +	}
> +
> +	rx_data->irq = fwnode_irq_get_byname(fwnode, "rx");
> +	if (rx_data->irq < 0) {
			^^^ Same problem here.

Should irq
> +		dev_err(&pdev->dev, "dma rx irq invalid\n");
> +		return rx_data->irq;
> +	}
> +
> +	device_property_read_u32(&pdev->dev, "clock-frequency", &i2s->clk_rate);
> +	if (!i2s->clk_rate) {
> +		dev_err(&pdev->dev, "clock-frequency property invalid\n");
> +		return -EINVAL;
> +	}
> +
> +	dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64));
> +
> +	if (i2s->rev_id == 1) {
> +		regmap_write(i2s->regmap, LS_I2S_CTRL, I2S_CTRL_RESET);
> +		udelay(200);
> +	}
> +
> +	ret = devm_snd_soc_register_component(&pdev->dev,
> +					      &loongson_i2s_component,
> +					      &loongson_i2s_dai, 1);
> +	if (ret) {
> +		dev_err(&pdev->dev, "register DAI failed %d\n", ret);
> +		return ret;
> +	}
> +
> +	return 0;
> +}
> +
> +static const struct pci_device_id loongson_i2s_ids[] = {
> +	{ PCI_DEVICE(PCI_VENDOR_ID_LOONGSON, 0x7a27) },
> +	{ },
> +};
> +MODULE_DEVICE_TABLE(pci, loongson_i2s_ids);
> +
> +static struct pci_driver loongson_i2s_driver = {
> +	.name = "loongson-i2s-pci",
> +	.id_table = loongson_i2s_ids,
> +	.probe = loongson_i2s_pci_probe,
> +	.driver = {
> +		.owner = THIS_MODULE,
> +		.pm = pm_sleep_ptr(&loongson_i2s_pm),
> +	},
> +};
> +module_pci_driver(loongson_i2s_driver);
> +
> +MODULE_DESCRIPTION("Loongson I2S Master Mode ASoC Driver");
> +MODULE_AUTHOR("Loongson Technology Corporation Limited");
> +MODULE_LICENSE("GPL");

Thanks,
Harshit