Unverified Commit d84881e0 authored by Yingkun Meng's avatar Yingkun Meng Committed by Mark Brown
Browse files

ASoC: Add support for Loongson I2S controller 



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: default avatarYingkun Meng <mengyingkun@loongson.cn>
Link: https://lore.kernel.org/r/20230615122718.3412942-1-mengyingkun@loongson.cn


Signed-off-by: default avatarMark Brown <broonie@kernel.org>
parent 06f2c60e

sound/soc/Kconfig

+1 −0
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@@ -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"

sound/soc/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -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/

sound/soc/loongson/Kconfig

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+16 −0
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# 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

sound/soc/loongson/Makefile

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# 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

sound/soc/loongson/loongson_dma.c

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// 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,

};