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Date: Mon, 19 Jun 2023 01:41:48 +0530
From: Harshit Mogalapalli <harshit.m.mogalapalli@...cle.com>
To: YingKun Meng <mengyingkun@...ngson.cn>, broonie@...nel.org,
lgirdwood@...il.com
Cc: krzysztof.kozlowski@...aro.org, linux-kernel@...r.kernel.org,
alsa-devel@...a-project.org, loongarch@...ts.linux.dev,
loongson-kernel@...ts.loongnix.cn,
Dan Carpenter <dan.carpenter@...aro.org>,
Dan Carpenter <error27@...il.com>,
kernel-janitors@...r.kernel.org,
Harshit Mogalapalli <harshit.m.mogalapalli@...cle.com>
Subject: Re: [PATCH v4 1/3] ASoC: Add support for Loongson I2S controller
Hi YingKun,
On 15/06/23 5:57 pm, YingKun Meng wrote:
> From: Yingkun Meng <mengyingkun@...ngson.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@...ngson.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@...ngson.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@...ngson.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@...ngson.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@...ngson.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@...ngson.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
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