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// SPDX-License-Identifier: GPL-2.0-or-later
// 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_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_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);
/* TX and RX block each have an independent bit to indicate
* if it is generating the clock for the I2S bus. The bus
* clocks need to be generated from either the TX or RX block,
* but not both
*/
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,
};
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_rate = 1,
.symmetric_channels = 1,
};
static const struct snd_soc_component_driver bcm63xx_i2s_component = {
.name = "bcm63xx",
.legacy_dai_naming = 1,
};
static int bcm63xx_i2s_dev_probe(struct platform_device *pdev)
{
int ret = 0;
void __iomem *regs;
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);
}
regs = devm_platform_ioremap_resource(pdev, 0);
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 void bcm63xx_i2s_dev_remove(struct platform_device *pdev)
{
bcm63xx_soc_platform_remove(pdev);
}
#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_new = 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");
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