[PATCH v4 1/3] ASoC: Add support for Loongson I2S controller
From: YingKun Meng
Date: Thu Jun 15 2023 - 08:28:18 EST
From: Yingkun Meng <mengyingkun@xxxxxxxxxxx>
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@xxxxxxxxxxx>
---
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@xxxxxxxxxxx>
+//
+
+#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@xxxxxxxxxxx>
+ */
+
+#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@xxxxxxxxxxx>
+//
+
+#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@xxxxxxxxxxx>
+ */
+
+#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@xxxxxxxxxxx>
+//
+
+#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");
+ if (tx_data->irq < 0) {
+ 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) {
+ 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");
--
2.33.0