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Subject[PATCH] ASoC: brcm: Add DSL/PON SoC audio driver
Date
This patch adds Broadcom DSL/PON SoC audio driver
with Whistler I2S block. The SoC supported by this
patch are BCM63158B0,BCM63178 and BCM47622/6755.

Signed-off-by: Kevin Li <kevin-ke.li@broadcom.com>
---
sound/soc/bcm/Kconfig | 9 +
sound/soc/bcm/Makefile | 4 +
sound/soc/bcm/bcm63xx-i2s-whistler.c | 328 ++++++++++++++++++
sound/soc/bcm/bcm63xx-i2s.h | 93 +++++
sound/soc/bcm/bcm63xx-pcm-whistler.c | 488 +++++++++++++++++++++++++++
5 files changed, 922 insertions(+)
create mode 100644 sound/soc/bcm/bcm63xx-i2s-whistler.c
create mode 100644 sound/soc/bcm/bcm63xx-i2s.h
create mode 100644 sound/soc/bcm/bcm63xx-pcm-whistler.c

diff --git a/sound/soc/bcm/Kconfig b/sound/soc/bcm/Kconfig
index 0037e96aa228..4218057b0874 100644
--- a/sound/soc/bcm/Kconfig
+++ b/sound/soc/bcm/Kconfig
@@ -17,3 +17,12 @@ config SND_SOC_CYGNUS
Cygnus chips (bcm958300, bcm958305, bcm911360)

If you don't know what to do here, say N.
+
+config SND_BCM63XX_I2S_WHISTLER
+ tristate "SoC Audio support for the Broadcom BCM63XX I2S module"
+ select REGMAP_MMIO
+ help
+ Say Y if you want to add support for ASoC audio on Broadcom
+ DSL/PON chips (bcm63158, bcm63178)
+
+ If you don't know what to do here, say N
diff --git a/sound/soc/bcm/Makefile b/sound/soc/bcm/Makefile
index b81fa421ec27..7c2d7899603b 100644
--- a/sound/soc/bcm/Makefile
+++ b/sound/soc/bcm/Makefile
@@ -9,3 +9,7 @@ snd-soc-cygnus-objs := cygnus-pcm.o cygnus-ssp.o

obj-$(CONFIG_SND_SOC_CYGNUS) += snd-soc-cygnus.o

+# BCM63XX Platform Support
+snd-soc-63xx-objs := bcm63xx-i2s-whistler.o bcm63xx-pcm-whistler.o
+
+obj-$(CONFIG_SND_BCM63XX_I2S_WHISTLER) += snd-soc-63xx.o
\ No newline at end of file
diff --git a/sound/soc/bcm/bcm63xx-i2s-whistler.c b/sound/soc/bcm/bcm63xx-i2s-whistler.c
new file mode 100644
index 000000000000..c37135f0b85c
--- /dev/null
+++ b/sound/soc/bcm/bcm63xx-i2s-whistler.c
@@ -0,0 +1,328 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * linux/sound/bcm/bcm63xx-i2s-whistler.c
+ * BCM63xx whistler i2s driver
+
+ * Copyright (c) 2020 Broadcom Corporation
+ * Author: Kevin-Ke Li <kevin-ke.li@broadcom.com>
+ */
+
+#include <linux/clk.h>
+#include <linux/dma-mapping.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/regmap.h>
+#include <sound/pcm_params.h>
+#include <sound/soc.h>
+#include "bcm63xx-i2s.h"
+
+#define DRV_NAME "brcm-i2s"
+
+static bool brcm_i2s_wr_reg(struct device *dev, unsigned int reg)
+{
+ switch (reg) {
+ case I2S_TX_CFG ... I2S_TX_DESC_IFF_LEN:
+ case I2S_TX_CFG_2 ... I2S_RX_DESC_IFF_LEN:
+ case I2S_RX_CFG_2 ... I2S_REG_MAX:
+ return true;
+ default:
+ return false;
+ }
+}
+
+static bool brcm_i2s_rd_reg(struct device *dev, unsigned int reg)
+{
+ switch (reg) {
+ case I2S_TX_CFG ... I2S_REG_MAX:
+ return true;
+ default:
+ return false;
+ }
+}
+
+static bool brcm_i2s_volatile_reg(struct device *dev, unsigned int reg)
+{
+ switch (reg) {
+ case I2S_TX_CFG:
+ case I2S_TX_IRQ_CTL:
+ case I2S_TX_DESC_IFF_ADDR:
+ case I2S_TX_DESC_IFF_LEN:
+ case I2S_TX_DESC_OFF_ADDR:
+ case I2S_TX_DESC_OFF_LEN:
+ case I2S_TX_CFG_2:
+ case I2S_RX_CFG:
+ case I2S_RX_IRQ_CTL:
+ case I2S_RX_DESC_OFF_ADDR:
+ case I2S_RX_DESC_OFF_LEN:
+ case I2S_RX_DESC_IFF_LEN:
+ case I2S_RX_DESC_IFF_ADDR:
+ case I2S_RX_CFG_2:
+ return true;
+ default:
+ return false;
+ }
+}
+
+static const struct regmap_config brcm_i2s_regmap_config = {
+ .reg_bits = 32,
+ .reg_stride = 4,
+ .val_bits = 32,
+ .max_register = I2S_REG_MAX,
+ .writeable_reg = brcm_i2s_wr_reg,
+ .readable_reg = brcm_i2s_rd_reg,
+ .volatile_reg = brcm_i2s_volatile_reg,
+ .cache_type = REGCACHE_FLAT,
+};
+
+static int bcm63xx_i2s_set_fmt(struct snd_soc_dai *cpu_dai, unsigned int fmt)
+{
+ return 0;
+}
+
+static int bcm63xx_i2s_hw_params(struct snd_pcm_substream *substream,
+ struct snd_pcm_hw_params *params,
+ struct snd_soc_dai *dai)
+{
+ int ret = 0;
+ struct bcm_i2s_priv *i2s_priv = snd_soc_dai_get_drvdata(dai);
+
+ ret = clk_set_rate(i2s_priv->i2s_clk, params_rate(params));
+ if (ret < 0)
+ dev_err(i2s_priv->dev,
+ "Can't set sample rate, err: %d\n", ret);
+
+ return ret;
+}
+
+static int bcm63xx_i2s_set_sysclk(struct snd_soc_dai *cpu_dai,
+ int clk_id, unsigned int freq, int dir)
+{
+ return 0;
+}
+
+static int bcm63xx_i2s_startup(struct snd_pcm_substream *substream,
+ struct snd_soc_dai *dai)
+{
+ unsigned int slaveMode;
+ struct bcm_i2s_priv *i2s_priv = snd_soc_dai_get_drvdata(dai);
+ struct regmap *regmap_i2s = i2s_priv->regmap_i2s;
+
+ if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
+ regmap_update_bits(regmap_i2s, I2S_TX_CFG,
+ I2S_TX_OUT_R | I2S_TX_DATA_ALIGNMENT |
+ I2S_TX_DATA_ENABLE | I2S_TX_CLOCK_ENABLE,
+ I2S_TX_OUT_R | I2S_TX_DATA_ALIGNMENT |
+ I2S_TX_DATA_ENABLE | I2S_TX_CLOCK_ENABLE);
+ regmap_write(regmap_i2s, I2S_TX_IRQ_CTL, 0);
+ regmap_write(regmap_i2s, I2S_TX_IRQ_IFF_THLD, 0);
+ regmap_write(regmap_i2s, I2S_TX_IRQ_OFF_THLD, 1);
+
+ regmap_read(regmap_i2s, I2S_RX_CFG_2, &slaveMode);
+ if (slaveMode & I2S_RX_SLAVE_MODE_MASK)
+ regmap_update_bits(regmap_i2s, I2S_TX_CFG_2,
+ I2S_TX_SLAVE_MODE_MASK,
+ I2S_TX_MASTER_MODE);
+ else
+ regmap_update_bits(regmap_i2s, I2S_TX_CFG_2,
+ I2S_TX_SLAVE_MODE_MASK,
+ I2S_TX_SLAVE_MODE);
+ } else {
+ regmap_update_bits(regmap_i2s, I2S_RX_CFG,
+ I2S_RX_IN_R | I2S_RX_DATA_ALIGNMENT |
+ I2S_RX_CLOCK_ENABLE,
+ I2S_RX_IN_R | I2S_RX_DATA_ALIGNMENT |
+ I2S_RX_CLOCK_ENABLE);
+ regmap_write(regmap_i2s, I2S_RX_IRQ_CTL, 0);
+ regmap_write(regmap_i2s, I2S_RX_IRQ_IFF_THLD, 0);
+ regmap_write(regmap_i2s, I2S_RX_IRQ_OFF_THLD, 1);
+
+ regmap_read(regmap_i2s, I2S_TX_CFG_2, &slaveMode);
+ if (slaveMode & I2S_TX_SLAVE_MODE_MASK)
+ regmap_update_bits(regmap_i2s, I2S_RX_CFG_2,
+ I2S_RX_SLAVE_MODE_MASK, 0);
+ else
+ regmap_update_bits(regmap_i2s, I2S_RX_CFG_2,
+ I2S_RX_SLAVE_MODE_MASK,
+ I2S_RX_SLAVE_MODE);
+ }
+ return 0;
+}
+
+static void bcm63xx_i2s_shutdown(struct snd_pcm_substream *substream,
+ struct snd_soc_dai *dai)
+{
+ unsigned int enabled, slavemode;
+ struct bcm_i2s_priv *i2s_priv = snd_soc_dai_get_drvdata(dai);
+ struct regmap *regmap_i2s = i2s_priv->regmap_i2s;
+
+ if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
+ regmap_update_bits(regmap_i2s, I2S_TX_CFG,
+ I2S_TX_OUT_R | I2S_TX_DATA_ALIGNMENT |
+ I2S_TX_DATA_ENABLE | I2S_TX_CLOCK_ENABLE, 0);
+ regmap_write(regmap_i2s, I2S_TX_IRQ_CTL, 1);
+ regmap_write(regmap_i2s, I2S_TX_IRQ_IFF_THLD, 4);
+ regmap_write(regmap_i2s, I2S_TX_IRQ_OFF_THLD, 4);
+
+ regmap_read(regmap_i2s, I2S_TX_CFG_2, &slavemode);
+ slavemode = slavemode & I2S_TX_SLAVE_MODE_MASK;
+ if (!slavemode) {
+ regmap_read(regmap_i2s, I2S_RX_CFG, &enabled);
+ enabled = enabled & I2S_RX_ENABLE_MASK;
+ if (enabled)
+ regmap_update_bits(regmap_i2s, I2S_RX_CFG_2,
+ I2S_RX_SLAVE_MODE_MASK,
+ I2S_RX_MASTER_MODE);
+ }
+ regmap_update_bits(regmap_i2s, I2S_TX_CFG_2,
+ I2S_TX_SLAVE_MODE_MASK,
+ I2S_TX_SLAVE_MODE);
+ } else {
+ regmap_update_bits(regmap_i2s, I2S_RX_CFG,
+ I2S_RX_IN_R | I2S_RX_DATA_ALIGNMENT |
+ I2S_RX_CLOCK_ENABLE, 0);
+ regmap_write(regmap_i2s, I2S_RX_IRQ_CTL, 1);
+ regmap_write(regmap_i2s, I2S_RX_IRQ_IFF_THLD, 4);
+ regmap_write(regmap_i2s, I2S_RX_IRQ_OFF_THLD, 4);
+
+ regmap_read(regmap_i2s, I2S_RX_CFG_2, &slavemode);
+ slavemode = slavemode & I2S_RX_SLAVE_MODE_MASK;
+ if (!slavemode) {
+ regmap_read(regmap_i2s, I2S_TX_CFG, &enabled);
+ enabled = enabled & I2S_TX_ENABLE_MASK;
+ if (enabled)
+ regmap_update_bits(regmap_i2s, I2S_TX_CFG_2,
+ I2S_TX_SLAVE_MODE_MASK,
+ I2S_TX_MASTER_MODE);
+ }
+
+ regmap_update_bits(regmap_i2s, I2S_RX_CFG_2,
+ I2S_RX_SLAVE_MODE_MASK, I2S_RX_SLAVE_MODE);
+ }
+}
+
+static const struct snd_soc_dai_ops bcm63xx_i2s_dai_ops = {
+ .startup = bcm63xx_i2s_startup,
+ .shutdown = bcm63xx_i2s_shutdown,
+ .hw_params = bcm63xx_i2s_hw_params,
+ .set_fmt = bcm63xx_i2s_set_fmt,
+ .set_sysclk = bcm63xx_i2s_set_sysclk,
+};
+
+static struct snd_soc_dai_driver bcm63xx_i2s_dai = {
+ .name = DRV_NAME,
+ .playback = {
+ .channels_min = 2,
+ .channels_max = 2,
+ .rates = SNDRV_PCM_RATE_8000_192000,
+ .formats = SNDRV_PCM_FMTBIT_S32_LE,
+ },
+ .capture = {
+ .channels_min = 2,
+ .channels_max = 2,
+ .rates = SNDRV_PCM_RATE_8000_192000,
+ .formats = SNDRV_PCM_FMTBIT_S32_LE,
+ },
+ .ops = &bcm63xx_i2s_dai_ops,
+ .symmetric_rates = 1,
+ .symmetric_channels = 1,
+};
+
+static const struct snd_soc_component_driver bcm63xx_i2s_component = {
+ .name = "bcm63xx",
+};
+
+static int bcm63xx_i2s_dev_probe(struct platform_device *pdev)
+{
+ int ret = 0;
+ void __iomem *regs;
+ struct resource *r_mem, *region;
+ struct bcm_i2s_priv *i2s_priv;
+ struct regmap *regmap_i2s;
+ struct clk *i2s_clk;
+
+ i2s_priv = devm_kzalloc(&pdev->dev, sizeof(*i2s_priv), GFP_KERNEL);
+ if (!i2s_priv)
+ return -ENOMEM;
+
+ i2s_clk = devm_clk_get(&pdev->dev, "i2sclk");
+ if (IS_ERR(i2s_clk)) {
+ dev_err(&pdev->dev, "%s: cannot get a brcm clock: %ld\n",
+ __func__, PTR_ERR(i2s_clk));
+ return PTR_ERR(i2s_clk);
+ }
+
+ r_mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!r_mem) {
+ dev_err(&pdev->dev, "Unable to get register resource.\n");
+ return -ENODEV;
+ }
+
+ region = devm_request_mem_region(&pdev->dev, r_mem->start,
+ resource_size(r_mem), DRV_NAME);
+ if (!region) {
+ dev_err(&pdev->dev, "Memory region already claimed\n");
+ return -EBUSY;
+ }
+
+ regs = devm_ioremap_resource(&pdev->dev, r_mem);
+ if (IS_ERR(regs)) {
+ ret = PTR_ERR(regs);
+ return ret;
+ }
+
+ regmap_i2s = devm_regmap_init_mmio(&pdev->dev,
+ regs, &brcm_i2s_regmap_config);
+ if (IS_ERR(regmap_i2s))
+ return PTR_ERR(regmap_i2s);
+
+ regmap_update_bits(regmap_i2s, I2S_MISC_CFG,
+ I2S_PAD_LVL_LOOP_DIS_MASK,
+ I2S_PAD_LVL_LOOP_DIS_ENABLE);
+
+ ret = devm_snd_soc_register_component(&pdev->dev,
+ &bcm63xx_i2s_component,
+ &bcm63xx_i2s_dai, 1);
+ if (ret) {
+ dev_err(&pdev->dev, "failed to register the dai\n");
+ return ret;
+ }
+
+ i2s_priv->dev = &pdev->dev;
+ i2s_priv->i2s_clk = i2s_clk;
+ i2s_priv->regmap_i2s = regmap_i2s;
+ dev_set_drvdata(&pdev->dev, i2s_priv);
+
+ ret = bcm63xx_soc_platform_probe(pdev, i2s_priv);
+ if (ret)
+ dev_err(&pdev->dev, "failed to register the pcm\n");
+
+ return ret;
+}
+
+static int bcm63xx_i2s_dev_remove(struct platform_device *pdev)
+{
+ bcm63xx_soc_platform_remove(pdev);
+ return 0;
+}
+
+#ifdef CONFIG_OF
+static const struct of_device_id snd_soc_bcm_audio_match[] = {
+ {.compatible = "brcm,bcm63xx-i2s"},
+ { }
+};
+#endif
+
+static struct platform_driver bcm63xx_i2s_driver = {
+ .driver = {
+ .name = DRV_NAME,
+ .of_match_table = of_match_ptr(snd_soc_bcm_audio_match),
+ },
+ .probe = bcm63xx_i2s_dev_probe,
+ .remove = bcm63xx_i2s_dev_remove,
+};
+
+module_platform_driver(bcm63xx_i2s_driver);
+
+MODULE_AUTHOR("Kevin,Li <kevin-ke.li@broadcom.com>");
+MODULE_DESCRIPTION("Broadcom DSL XPON ASOC I2S Interface");
+MODULE_LICENSE("GPL v2");
diff --git a/sound/soc/bcm/bcm63xx-i2s.h b/sound/soc/bcm/bcm63xx-i2s.h
new file mode 100644
index 000000000000..695e9ba88544
--- /dev/null
+++ b/sound/soc/bcm/bcm63xx-i2s.h
@@ -0,0 +1,93 @@
+/* SPDX-License-Identifier: GPL-2.0-only*/
+/*
+ * linux/sound/soc/bcm/bcm63xx-i2s.h
+ *
+ * Copyright (c) 2020 Broadcom Corporation
+ * Author: Kevin-Ke Li <kevin-ke.li@broadcom.com>
+ */
+
+#ifndef __BCM63XX_I2S_H
+#define __BCM63XX_I2S_H
+
+#define I2S_DESC_FIFO_DEPTH 8
+#define I2S_MISC_CFG (0x003C)
+#define I2S_PAD_LVL_LOOP_DIS_MASK (1 << 2)
+#define I2S_PAD_LVL_LOOP_DIS_ENABLE I2S_PAD_LVL_LOOP_DIS_MASK
+
+#define I2S_TX_ENABLE_MASK (1 << 31)
+#define I2S_TX_ENABLE I2S_TX_ENABLE_MASK
+#define I2S_TX_OUT_R (1 << 19)
+#define I2S_TX_DATA_ALIGNMENT (1 << 2)
+#define I2S_TX_DATA_ENABLE (1 << 1)
+#define I2S_TX_CLOCK_ENABLE (1 << 0)
+
+#define I2S_TX_DESC_OFF_LEVEL_SHIFT 12
+#define I2S_TX_DESC_OFF_LEVEL_MASK (0x0F << I2S_TX_DESC_OFF_LEVEL_SHIFT)
+#define I2S_TX_DESC_IFF_LEVEL_SHIFT 8
+#define I2S_TX_DESC_IFF_LEVEL_MASK (0x0F << I2S_TX_DESC_IFF_LEVEL_SHIFT)
+#define I2S_TX_DESC_OFF_INTR_EN_MSK (1 << 1)
+#define I2S_TX_DESC_OFF_INTR_EN I2S_TX_DESC_OFF_INTR_EN_MSK
+
+#define I2S_TX_CFG (0x0000)
+#define I2S_TX_IRQ_CTL (0x0004)
+#define I2S_TX_IRQ_EN (0x0008)
+#define I2S_TX_IRQ_IFF_THLD (0x000c)
+#define I2S_TX_IRQ_OFF_THLD (0x0010)
+#define I2S_TX_DESC_IFF_ADDR (0x0014)
+#define I2S_TX_DESC_IFF_LEN (0x0018)
+#define I2S_TX_DESC_OFF_ADDR (0x001C)
+#define I2S_TX_DESC_OFF_LEN (0x0020)
+#define I2S_TX_CFG_2 (0x0024)
+#define I2S_TX_SLAVE_MODE_SHIFT 13
+#define I2S_TX_SLAVE_MODE_MASK (1 << I2S_TX_SLAVE_MODE_SHIFT)
+#define I2S_TX_SLAVE_MODE I2S_TX_SLAVE_MODE_MASK
+#define I2S_TX_MASTER_MODE 0
+#define I2S_TX_INTR_MASK 0x0F
+
+#define I2S_RX_ENABLE_MASK (1 << 31)
+#define I2S_RX_ENABLE I2S_RX_ENABLE_MASK
+#define I2S_RX_IN_R (1 << 19)
+#define I2S_RX_DATA_ALIGNMENT (1 << 2)
+#define I2S_RX_CLOCK_ENABLE (1 << 0)
+
+#define I2S_RX_DESC_OFF_LEVEL_SHIFT 12
+#define I2S_RX_DESC_OFF_LEVEL_MASK (0x0F << I2S_RX_DESC_OFF_LEVEL_SHIFT)
+#define I2S_RX_DESC_IFF_LEVEL_SHIFT 8
+#define I2S_RX_DESC_IFF_LEVEL_MASK (0x0F << I2S_RX_DESC_IFF_LEVEL_SHIFT)
+#define I2S_RX_DESC_OFF_INTR_EN_MSK (1 << 1)
+#define I2S_RX_DESC_OFF_INTR_EN I2S_RX_DESC_OFF_INTR_EN_MSK
+
+#define I2S_RX_CFG (0x0040) /* 20c0 */
+#define I2S_RX_IRQ_CTL (0x0044)
+#define I2S_RX_IRQ_EN (0x0048)
+#define I2S_RX_IRQ_IFF_THLD (0x004C)
+#define I2S_RX_IRQ_OFF_THLD (0x0050)
+#define I2S_RX_DESC_IFF_ADDR (0x0054)
+#define I2S_RX_DESC_IFF_LEN (0x0058)
+#define I2S_RX_DESC_OFF_ADDR (0x005C)
+#define I2S_RX_DESC_OFF_LEN (0x0060)
+#define I2S_RX_CFG_2 (0x0064)
+#define I2S_RX_SLAVE_MODE_SHIFT 13
+#define I2S_RX_SLAVE_MODE_MASK (1 << I2S_RX_SLAVE_MODE_SHIFT)
+#define I2S_RX_SLAVE_MODE I2S_RX_SLAVE_MODE_MASK
+#define I2S_RX_MASTER_MODE 0
+#define I2S_RX_INTR_MASK 0x0F
+
+#define I2S_REG_MAX 0x007C
+
+struct bcm_i2s_priv {
+ struct device *dev;
+ struct resource *r_irq;
+ struct regmap *regmap_i2s;
+ struct clk *i2s_clk;
+ struct snd_pcm_substream *play_substream;
+ struct snd_pcm_substream *capture_substream;
+ struct i2s_dma_desc *play_dma_desc;
+ struct i2s_dma_desc *capture_dma_desc;
+};
+
+extern int bcm63xx_soc_platform_probe(struct platform_device *pdev,
+ struct bcm_i2s_priv *i2s_priv);
+extern int bcm63xx_soc_platform_remove(struct platform_device *pdev);
+
+#endif
diff --git a/sound/soc/bcm/bcm63xx-pcm-whistler.c b/sound/soc/bcm/bcm63xx-pcm-whistler.c
new file mode 100644
index 000000000000..fdf383a9a99a
--- /dev/null
+++ b/sound/soc/bcm/bcm63xx-pcm-whistler.c
@@ -0,0 +1,488 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * linux/sound/bcm/bcm63xx-pcm-whistler.c
+ * BCM63xx whistler pcm interface
+
+ * Copyright (c) 2020 Broadcom Corporation
+ * Author: Kevin-Ke Li <kevin-ke.li@broadcom.com>
+ */
+
+#include <linux/dma-mapping.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <sound/pcm_params.h>
+#include <linux/regmap.h>
+#include <linux/of_device.h>
+#include <sound/soc.h>
+#include "bcm63xx-i2s.h"
+
+
+struct i2s_dma_desc {
+ unsigned char *dma_area;
+ dma_addr_t dma_addr;
+ unsigned int dma_len;
+};
+
+struct bcm63xx_runtime_data {
+ int dma_len;
+ dma_addr_t dma_addr;
+ dma_addr_t dma_addr_next;
+};
+
+static const struct snd_pcm_hardware bcm63xx_pcm_hardware = {
+ .info = SNDRV_PCM_INFO_MMAP |
+ SNDRV_PCM_INFO_MMAP_VALID |
+ SNDRV_PCM_INFO_INTERLEAVED |
+ SNDRV_PCM_INFO_PAUSE |
+ SNDRV_PCM_INFO_RESUME,
+ .formats = SNDRV_PCM_FMTBIT_S32_LE, /* support S32 only */
+ .period_bytes_max = 8192 - 32,
+ .periods_min = 1,
+ .periods_max = PAGE_SIZE/sizeof(struct i2s_dma_desc),
+ .buffer_bytes_max = 128 * 1024,
+ .fifo_size = 32,
+};
+
+static int bcm63xx_pcm_hw_params(struct snd_soc_component *component,
+ struct snd_pcm_substream *substream,
+ struct snd_pcm_hw_params *params)
+{
+ struct i2s_dma_desc *dma_desc;
+ struct snd_soc_pcm_runtime *rtd = substream->private_data;
+ struct snd_pcm_runtime *runtime = substream->runtime;
+
+ snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
+ runtime->dma_bytes = params_buffer_bytes(params);
+
+ dma_desc = kzalloc(sizeof(*dma_desc), GFP_NOWAIT);
+ if (!dma_desc)
+ return -ENOMEM;
+
+ snd_soc_dai_set_dma_data(rtd->cpu_dai, substream, dma_desc);
+
+ return 0;
+}
+
+static int bcm63xx_pcm_hw_free(struct snd_soc_component *component,
+ struct snd_pcm_substream *substream)
+{
+ struct i2s_dma_desc *dma_desc;
+ struct snd_soc_pcm_runtime *rtd = substream->private_data;
+
+ dma_desc = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
+ kfree(dma_desc);
+ snd_pcm_set_runtime_buffer(substream, NULL);
+
+ return 0;
+}
+
+static int bcm63xx_pcm_trigger(struct snd_soc_component *component,
+ struct snd_pcm_substream *substream, int cmd)
+{
+ int ret = 0;
+ struct snd_soc_pcm_runtime *rtd;
+ struct bcm_i2s_priv *i2s_priv;
+ struct regmap *regmap_i2s;
+
+ rtd = substream->private_data;
+ i2s_priv = dev_get_drvdata(rtd->cpu_dai->dev);
+ regmap_i2s = i2s_priv->regmap_i2s;
+
+ if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
+ switch (cmd) {
+ case SNDRV_PCM_TRIGGER_START:
+ regmap_update_bits(regmap_i2s,
+ I2S_TX_IRQ_EN,
+ I2S_TX_DESC_OFF_INTR_EN,
+ I2S_TX_DESC_OFF_INTR_EN);
+ regmap_update_bits(regmap_i2s,
+ I2S_TX_CFG,
+ I2S_TX_ENABLE_MASK,
+ I2S_TX_ENABLE);
+ break;
+ case SNDRV_PCM_TRIGGER_STOP:
+ case SNDRV_PCM_TRIGGER_SUSPEND:
+ case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
+ regmap_write(regmap_i2s,
+ I2S_TX_IRQ_EN,
+ 0);
+ regmap_update_bits(regmap_i2s,
+ I2S_TX_CFG,
+ I2S_TX_ENABLE_MASK,
+ 0);
+ break;
+ default:
+ ret = -EINVAL;
+ }
+ } else {
+ switch (cmd) {
+ case SNDRV_PCM_TRIGGER_START:
+ regmap_update_bits(regmap_i2s,
+ I2S_RX_IRQ_EN,
+ I2S_RX_DESC_OFF_INTR_EN_MSK,
+ I2S_RX_DESC_OFF_INTR_EN);
+ regmap_update_bits(regmap_i2s,
+ I2S_RX_CFG,
+ I2S_RX_ENABLE_MASK,
+ I2S_RX_ENABLE);
+ break;
+ case SNDRV_PCM_TRIGGER_STOP:
+ case SNDRV_PCM_TRIGGER_SUSPEND:
+ case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
+ regmap_update_bits(regmap_i2s,
+ I2S_RX_IRQ_EN,
+ I2S_RX_DESC_OFF_INTR_EN_MSK,
+ 0);
+ regmap_update_bits(regmap_i2s,
+ I2S_RX_CFG,
+ I2S_RX_ENABLE_MASK,
+ 0);
+ break;
+ default:
+ ret = -EINVAL;
+ }
+ }
+ return ret;
+}
+
+static int bcm63xx_pcm_prepare(struct snd_soc_component *component,
+ struct snd_pcm_substream *substream)
+{
+ struct i2s_dma_desc *dma_desc;
+ struct regmap *regmap_i2s;
+ struct bcm_i2s_priv *i2s_priv;
+ struct snd_soc_pcm_runtime *rtd = substream->private_data;
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ uint32_t regaddr_desclen, regaddr_descaddr;
+
+ dma_desc = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
+ dma_desc->dma_len = snd_pcm_lib_period_bytes(substream);
+ dma_desc->dma_addr = runtime->dma_addr;
+ dma_desc->dma_area = runtime->dma_area;
+
+ if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
+ regaddr_desclen = I2S_TX_DESC_IFF_LEN;
+ regaddr_descaddr = I2S_TX_DESC_IFF_ADDR;
+ } else {
+ regaddr_desclen = I2S_RX_DESC_IFF_LEN;
+ regaddr_descaddr = I2S_RX_DESC_IFF_ADDR;
+ }
+
+ i2s_priv = dev_get_drvdata(rtd->cpu_dai->dev);
+ regmap_i2s = i2s_priv->regmap_i2s;
+
+ regmap_write(regmap_i2s, regaddr_desclen, dma_desc->dma_len);
+ regmap_write(regmap_i2s, regaddr_descaddr, dma_desc->dma_addr);
+
+ return 0;
+}
+
+static snd_pcm_uframes_t
+bcm63xx_pcm_pointer(struct snd_soc_component *component,
+ struct snd_pcm_substream *substream)
+{
+ snd_pcm_uframes_t x;
+ struct bcm63xx_runtime_data *prtd = substream->runtime->private_data;
+
+ if ((void *)prtd->dma_addr_next == NULL)
+ prtd->dma_addr_next = substream->runtime->dma_addr;
+
+ x = bytes_to_frames(substream->runtime,
+ prtd->dma_addr_next - substream->runtime->dma_addr);
+
+ return x == substream->runtime->buffer_size ? 0 : x;
+}
+
+static int bcm63xx_pcm_mmap(struct snd_soc_component *component,
+ struct snd_pcm_substream *substream,
+ struct vm_area_struct *vma)
+{
+ struct snd_pcm_runtime *runtime = substream->runtime;
+
+ return dma_mmap_wc(substream->pcm->card->dev, vma,
+ runtime->dma_area,
+ runtime->dma_addr,
+ runtime->dma_bytes);
+
+}
+
+static int bcm63xx_pcm_open(struct snd_soc_component *component,
+ struct snd_pcm_substream *substream)
+{
+ int ret = 0;
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ struct bcm63xx_runtime_data *prtd;
+
+ runtime->hw = bcm63xx_pcm_hardware;
+ ret = snd_pcm_hw_constraint_step(runtime, 0,
+ SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 32);
+ if (ret)
+ goto out;
+
+ ret = snd_pcm_hw_constraint_step(runtime, 0,
+ SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 32);
+ if (ret)
+ goto out;
+
+ ret = snd_pcm_hw_constraint_integer(runtime,
+ SNDRV_PCM_HW_PARAM_PERIODS);
+ if (ret < 0)
+ goto out;
+
+ ret = -ENOMEM;
+ prtd = kzalloc(sizeof(*prtd), GFP_KERNEL);
+ if (!prtd)
+ goto out;
+
+ runtime->private_data = prtd;
+ return 0;
+out:
+ return ret;
+}
+
+static int bcm63xx_pcm_close(struct snd_soc_component *component,
+ struct snd_pcm_substream *substream)
+{
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ struct bcm63xx_runtime_data *prtd = runtime->private_data;
+
+ kfree(prtd);
+ return 0;
+}
+
+static irqreturn_t i2s_dma_isr(int irq, void *bcm_i2s_priv)
+{
+ unsigned int availdepth, ifflevel, offlevel, int_status, val_1, val_2;
+ struct bcm63xx_runtime_data *prtd;
+ struct snd_pcm_substream *substream;
+ struct snd_pcm_runtime *runtime;
+ struct regmap *regmap_i2s;
+ struct i2s_dma_desc *dma_desc;
+ struct snd_soc_pcm_runtime *rtd;
+ struct bcm_i2s_priv *i2s_priv;
+
+ i2s_priv = (struct bcm_i2s_priv *)bcm_i2s_priv;
+ regmap_i2s = i2s_priv->regmap_i2s;
+
+ /* rx */
+ regmap_read(regmap_i2s, I2S_RX_IRQ_CTL, &int_status);
+
+ if (int_status & I2S_RX_DESC_OFF_INTR_EN_MSK) {
+ substream = i2s_priv->capture_substream;
+ runtime = substream->runtime;
+ rtd = substream->private_data;
+ prtd = runtime->private_data;
+ dma_desc = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
+
+ offlevel = (int_status & I2S_RX_DESC_OFF_LEVEL_MASK) >>
+ I2S_RX_DESC_OFF_LEVEL_SHIFT;
+ while (offlevel) {
+ regmap_read(regmap_i2s, I2S_RX_DESC_OFF_ADDR, &val_1);
+ regmap_read(regmap_i2s, I2S_RX_DESC_OFF_LEN, &val_2);
+ offlevel--;
+ }
+ prtd->dma_addr_next = val_1 + val_2;
+ ifflevel = (int_status & I2S_RX_DESC_IFF_LEVEL_MASK) >>
+ I2S_RX_DESC_IFF_LEVEL_SHIFT;
+
+ availdepth = I2S_DESC_FIFO_DEPTH - ifflevel;
+ while (availdepth) {
+ dma_desc->dma_addr +=
+ snd_pcm_lib_period_bytes(substream);
+ dma_desc->dma_area +=
+ snd_pcm_lib_period_bytes(substream);
+ if (dma_desc->dma_addr - runtime->dma_addr >=
+ runtime->dma_bytes) {
+ dma_desc->dma_addr = runtime->dma_addr;
+ dma_desc->dma_area = runtime->dma_area;
+ }
+
+ prtd->dma_addr = dma_desc->dma_addr;
+ regmap_write(regmap_i2s, I2S_RX_DESC_IFF_LEN,
+ snd_pcm_lib_period_bytes(substream));
+ regmap_write(regmap_i2s, I2S_RX_DESC_IFF_ADDR,
+ dma_desc->dma_addr);
+ availdepth--;
+ }
+
+ snd_pcm_period_elapsed(substream);
+
+ /* Clear interrupt by writing 0 */
+ regmap_update_bits(regmap_i2s, I2S_RX_IRQ_CTL,
+ I2S_RX_INTR_MASK, 0);
+ }
+
+ /* tx */
+ regmap_read(regmap_i2s, I2S_TX_IRQ_CTL, &int_status);
+
+ if (int_status & I2S_TX_DESC_OFF_INTR_EN_MSK) {
+ substream = i2s_priv->play_substream;
+ runtime = substream->runtime;
+ rtd = substream->private_data;
+ prtd = runtime->private_data;
+ dma_desc = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
+
+ offlevel = (int_status & I2S_TX_DESC_OFF_LEVEL_MASK) >>
+ I2S_TX_DESC_OFF_LEVEL_SHIFT;
+ while (offlevel) {
+ regmap_read(regmap_i2s, I2S_TX_DESC_OFF_ADDR, &val_1);
+ regmap_read(regmap_i2s, I2S_TX_DESC_OFF_LEN, &val_2);
+ prtd->dma_addr_next = val_1 + val_2;
+ offlevel--;
+ }
+
+ ifflevel = (int_status & I2S_TX_DESC_IFF_LEVEL_MASK) >>
+ I2S_TX_DESC_IFF_LEVEL_SHIFT;
+ availdepth = I2S_DESC_FIFO_DEPTH - ifflevel;
+
+ while (availdepth) {
+ dma_desc->dma_addr +=
+ snd_pcm_lib_period_bytes(substream);
+ dma_desc->dma_area +=
+ snd_pcm_lib_period_bytes(substream);
+
+ if (dma_desc->dma_addr - runtime->dma_addr >=
+ runtime->dma_bytes) {
+ dma_desc->dma_addr = runtime->dma_addr;
+ dma_desc->dma_area = runtime->dma_area;
+ }
+
+ prtd->dma_addr = dma_desc->dma_addr;
+ regmap_write(regmap_i2s, I2S_TX_DESC_IFF_LEN,
+ snd_pcm_lib_period_bytes(substream));
+ regmap_write(regmap_i2s, I2S_TX_DESC_IFF_ADDR,
+ dma_desc->dma_addr);
+ availdepth--;
+ }
+
+ snd_pcm_period_elapsed(substream);
+
+ /* Clear interrupt by writing 0 */
+ regmap_update_bits(regmap_i2s, I2S_TX_IRQ_CTL,
+ I2S_TX_INTR_MASK, 0);
+ }
+
+ return IRQ_HANDLED;
+}
+
+static int bcm63xx_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream)
+{
+ struct snd_pcm_substream *substream = pcm->streams[stream].substream;
+ struct snd_dma_buffer *buf = &substream->dma_buffer;
+ size_t size = bcm63xx_pcm_hardware.buffer_bytes_max;
+
+ buf->dev.type = SNDRV_DMA_TYPE_DEV;
+ buf->dev.dev = pcm->card->dev;
+ buf->private_data = NULL;
+
+ buf->area = dma_alloc_wc(pcm->card->dev,
+ size, &buf->addr,
+ GFP_KERNEL);
+ if (!buf->area)
+ return -ENOMEM;
+ buf->bytes = size;
+ return 0;
+}
+
+static int bcm63xx_soc_pcm_new(struct snd_soc_component *component,
+ struct snd_soc_pcm_runtime *rtd)
+{
+ struct snd_pcm *pcm = rtd->pcm;
+ struct bcm_i2s_priv *i2s_priv;
+ int ret;
+
+ i2s_priv = dev_get_drvdata(rtd->cpu_dai->dev);
+
+ of_dma_configure(pcm->card->dev, pcm->card->dev->of_node, 1);
+
+ ret = dma_coerce_mask_and_coherent(pcm->card->dev, DMA_BIT_MASK(32));
+ if (ret)
+ goto out;
+
+ if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
+ ret = bcm63xx_pcm_preallocate_dma_buffer(pcm,
+ SNDRV_PCM_STREAM_PLAYBACK);
+ if (ret)
+ goto out;
+
+ i2s_priv->play_substream =
+ pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream;
+ }
+
+ if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
+ ret = bcm63xx_pcm_preallocate_dma_buffer(pcm,
+ SNDRV_PCM_STREAM_CAPTURE);
+ if (ret)
+ goto out;
+ i2s_priv->capture_substream =
+ pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream;
+ }
+
+out:
+ return ret;
+}
+
+static void bcm63xx_pcm_free_dma_buffers(struct snd_soc_component *component,
+ struct snd_pcm *pcm)
+{
+ int stream;
+ struct snd_dma_buffer *buf;
+ struct snd_pcm_substream *substream;
+
+ for (stream = 0; stream < 2; stream++) {
+ substream = pcm->streams[stream].substream;
+ if (!substream)
+ continue;
+ buf = &substream->dma_buffer;
+ if (!buf->area)
+ continue;
+ dma_free_wc(pcm->card->dev, buf->bytes,
+ buf->area, buf->addr);
+ buf->area = NULL;
+ }
+}
+
+static const struct snd_soc_component_driver bcm63xx_soc_platform = {
+ .open = bcm63xx_pcm_open,
+ .close = bcm63xx_pcm_close,
+ .hw_params = bcm63xx_pcm_hw_params,
+ .hw_free = bcm63xx_pcm_hw_free,
+ .prepare = bcm63xx_pcm_prepare,
+ .trigger = bcm63xx_pcm_trigger,
+ .pointer = bcm63xx_pcm_pointer,
+ .mmap = bcm63xx_pcm_mmap,
+ .pcm_construct = bcm63xx_soc_pcm_new,
+ .pcm_destruct = bcm63xx_pcm_free_dma_buffers,
+};
+
+int bcm63xx_soc_platform_probe(struct platform_device *pdev,
+ struct bcm_i2s_priv *i2s_priv)
+{
+ int ret;
+
+ i2s_priv->r_irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
+ if (!i2s_priv->r_irq) {
+ dev_err(&pdev->dev, "Unable to get register irq resource.\n");
+ return -ENODEV;
+ }
+
+ ret = devm_request_irq(&pdev->dev, i2s_priv->r_irq->start, i2s_dma_isr,
+ i2s_priv->r_irq->flags, "i2s_dma", (void *)i2s_priv);
+ if (ret) {
+ dev_err(&pdev->dev,
+ "i2s_init: failed to request interrupt.ret=%d\n", ret);
+ return ret;
+ }
+
+ return devm_snd_soc_register_component(&pdev->dev,
+ &bcm63xx_soc_platform, NULL, 0);
+}
+
+int bcm63xx_soc_platform_remove(struct platform_device *pdev)
+{
+ return 0;
+}
+
+MODULE_AUTHOR("Kevin,Li <kevin-ke.li@broadcom.com>");
+MODULE_DESCRIPTION("Broadcom DSL XPON ASOC PCM Interface");
+MODULE_LICENSE("GPL v2");
--
2.25.1
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  Last update: 2020-03-06 23:27    [W:0.578 / U:9.356 seconds]
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