Re: [PATCH v1 4/5] ASoC: starfive: Add JH7110 PWM-DAC driver

[Walker Chen]

On 2023/6/26 19:09, Hal Feng wrote:
> Add PWM-DAC driver support for the StarFive JH7110 SoC.
> 
> Signed-off-by: Hal Feng <hal.feng@xxxxxxxxxxxxxxxx>

Thanks!
Reviewed-by: Walker Chen <walker.chen@xxxxxxxxxxxxxxxx>

> ---
>  MAINTAINERS                        |   8 +
>  sound/soc/starfive/Kconfig         |   9 +
>  sound/soc/starfive/Makefile        |   1 +
>  sound/soc/starfive/jh7110_pwmdac.c | 787 +++++++++++++++++++++++++++++
>  4 files changed, 805 insertions(+)
>  create mode 100644 sound/soc/starfive/jh7110_pwmdac.c
> 
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 1dc12c5c02f7..a936ba4d5f1d 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -20125,6 +20125,14 @@ S:	Supported
>  F:	Documentation/devicetree/bindings/mmc/starfive*
>  F:	drivers/mmc/host/dw_mmc-starfive.c
>  
> +STARFIVE JH7110 PWMDAC DRIVER
> +M:	Hal Feng <hal.feng@xxxxxxxxxxxxxxxx>
> +M:	Xingyu Wu <xingyu.wu@xxxxxxxxxxxxxxxx>
> +S:	Supported
> +F:	Documentation/devicetree/bindings/sound/starfive,jh7110-pwmdac*
> +F:	sound/soc/codecs/jh7110_pwmdac_transmitter.c
> +F:	sound/soc/starfive/jh7110_pwmdac.c
> +
>  STARFIVE JH71X0 CLOCK DRIVERS
>  M:	Emil Renner Berthing <kernel@xxxxxxxx>
>  M:	Hal Feng <hal.feng@xxxxxxxxxxxxxxxx>
> diff --git a/sound/soc/starfive/Kconfig b/sound/soc/starfive/Kconfig
> index fafb681f8c0a..fabef377db8c 100644
> --- a/sound/soc/starfive/Kconfig
> +++ b/sound/soc/starfive/Kconfig
> @@ -7,6 +7,15 @@ config SND_SOC_STARFIVE
>  	  the Starfive SoCs' Audio interfaces. You will also need to
>  	  select the audio interfaces to support below.
>  
> +config SND_SOC_JH7110_PWMDAC
> +	tristate "JH7110 PWM-DAC device driver"
> +	depends on HAVE_CLK && SND_SOC_STARFIVE
> +	select SND_SOC_GENERIC_DMAENGINE_PCM
> +	select SND_SOC_JH7110_PWMDAC_DIT
> +	help
> +	 Say Y or M if you want to add support for StarFive JH7110
> +	 PWM-DAC driver.
> +
>  config SND_SOC_JH7110_TDM
>  	tristate "JH7110 TDM device driver"
>  	depends on HAVE_CLK && SND_SOC_STARFIVE
> diff --git a/sound/soc/starfive/Makefile b/sound/soc/starfive/Makefile
> index f7d960211d72..9e958f70ef51 100644
> --- a/sound/soc/starfive/Makefile
> +++ b/sound/soc/starfive/Makefile
> @@ -1,2 +1,3 @@
>  # StarFive Platform Support
> +obj-$(CONFIG_SND_SOC_JH7110_PWMDAC) += jh7110_pwmdac.o
>  obj-$(CONFIG_SND_SOC_JH7110_TDM) += jh7110_tdm.o
> diff --git a/sound/soc/starfive/jh7110_pwmdac.c b/sound/soc/starfive/jh7110_pwmdac.c
> new file mode 100644
> index 000000000000..c3123bd6ea45
> --- /dev/null
> +++ b/sound/soc/starfive/jh7110_pwmdac.c
> @@ -0,0 +1,787 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * jh7110_pwmdac.c -- StarFive JH7110 PWM-DAC driver
> + *
> + * Copyright (C) 2021-2023 StarFive Technology Co., Ltd.
> + *
> + * Authors: Jenny Zhang
> + *	    Curry Zhang
> + *	    Xingyu Wu <xingyu.wu@xxxxxxxxxxxxxxxx>
> + *	    Hal Feng <hal.feng@xxxxxxxxxxxxxxxx>
> + */
> +
> +#include <linux/clk.h>
> +#include <linux/device.h>
> +#include <linux/init.h>
> +#include <linux/interrupt.h>
> +#include <linux/io.h>
> +#include <linux/module.h>
> +#include <linux/pm_runtime.h>
> +#include <linux/reset.h>
> +#include <linux/slab.h>
> +#include <linux/types.h>
> +#include <sound/dmaengine_pcm.h>
> +#include <sound/pcm.h>
> +#include <sound/pcm_params.h>
> +#include <sound/soc.h>
> +
> +#define JH7110_PWMDAC_WDATA				0x00
> +#define JH7110_PWMDAC_CTRL				0x04
> +	#define JH7110_PWMDAC_ENABLE			BIT(0)
> +	#define JH7110_PWMDAC_SHIFT			BIT(1)
> +	#define JH7110_PWMDAC_DUTY_CYCLE_SHIFT		2
> +	#define JH7110_PWMDAC_DUTY_CYCLE_MASK		GENMASK(3, 2)
> +	#define JH7110_PWMDAC_CNT_N_SHIFT		4
> +	#define JH7110_PWMDAC_CNT_N_MASK		GENMASK(12, 4)
> +	#define JH7110_PWMDAC_DATA_CHANGE		BIT(13)
> +	#define JH7110_PWMDAC_DATA_MODE			BIT(14)
> +	#define JH7110_PWMDAC_DATA_SHIFT_SHIFT		15
> +	#define JH7110_PWMDAC_DATA_SHIFT_MASK		GENMASK(17, 15)
> +
> +enum JH7110_PWMDAC_SHIFT_VAL {
> +	PWMDAC_SHIFT_8 = 0,
> +	PWMDAC_SHIFT_10,
> +};
> +
> +enum JH7110_PWMDAC_DUTY_CYCLE_VAL {
> +	PWMDAC_CYCLE_LEFT = 0,
> +	PWMDAC_CYCLE_RIGHT,
> +	PWMDAC_CYCLE_CENTER,
> +};
> +
> +enum JH7110_PWMDAC_CNT_N_VAL {
> +	PWMDAC_SAMPLE_CNT_1 = 1,
> +	PWMDAC_SAMPLE_CNT_2,
> +	PWMDAC_SAMPLE_CNT_3,
> +	PWMDAC_SAMPLE_CNT_512 = 512, /* max */
> +};
> +
> +enum JH7110_PWMDAC_DATA_CHANGE_VAL {
> +	NO_CHANGE = 0,
> +	CHANGE,
> +};
> +
> +enum JH7110_PWMDAC_DATA_MODE_VAL {
> +	UNSIGNED_DATA = 0,
> +	INVERTER_DATA_MSB,
> +};
> +
> +enum JH7110_PWMDAC_DATA_SHIFT_VAL {
> +	PWMDAC_DATA_LEFT_SHIFT_BIT_0 = 0,
> +	PWMDAC_DATA_LEFT_SHIFT_BIT_1,
> +	PWMDAC_DATA_LEFT_SHIFT_BIT_2,
> +	PWMDAC_DATA_LEFT_SHIFT_BIT_3,
> +	PWMDAC_DATA_LEFT_SHIFT_BIT_4,
> +	PWMDAC_DATA_LEFT_SHIFT_BIT_5,
> +	PWMDAC_DATA_LEFT_SHIFT_BIT_6,
> +	PWMDAC_DATA_LEFT_SHIFT_BIT_7,
> +};
> +
> +struct jh7110_pwmdac_dev {
> +	void __iomem *base;
> +	resource_size_t	mapbase;
> +	u8 shift;
> +	u8 duty_cycle;
> +	u8 cnt_n;
> +	u8 data_change;
> +	u8 data_mode;
> +	u8 data_shift;
> +
> +	struct clk_bulk_data clks[2];
> +	struct reset_control *rst_apb;
> +	struct device *dev;
> +	struct snd_dmaengine_dai_dma_data play_dma_data;
> +	u32 saved_ctrl;
> +};
> +
> +enum jh7110_ct_pwmdac_name {
> +	PWMDAC_CT_SHIFT = 0,
> +	PWMDAC_CT_DUTY_CYCLE,
> +	PWMDAC_CT_DATA_CHANGE,
> +	PWMDAC_CT_DATA_MODE,
> +	PWMDAC_CT_DATA_SHIFT,
> +};
> +
> +struct jh7110_ct_pwmdac {
> +	char *name;
> +	unsigned int vals;
> +};
> +
> +static const struct jh7110_ct_pwmdac pwmdac_ct_shift[] = {
> +	{ .name = "8bit", .vals = PWMDAC_SHIFT_8 },
> +	{ .name = "10bit", .vals = PWMDAC_SHIFT_10 }
> +};
> +
> +static const struct jh7110_ct_pwmdac pwmdac_ct_duty_cycle[] = {
> +	{ .name = "left", .vals = PWMDAC_CYCLE_LEFT },
> +	{ .name = "right", .vals = PWMDAC_CYCLE_RIGHT },
> +	{ .name = "center", .vals = PWMDAC_CYCLE_CENTER }
> +};
> +
> +static const struct jh7110_ct_pwmdac pwmdac_ct_data_change[] = {
> +	{ .name = "no_change", .vals = NO_CHANGE },
> +	{ .name = "change", .vals = CHANGE }
> +};
> +
> +static const struct jh7110_ct_pwmdac pwmdac_ct_data_mode[] = {
> +	{ .name = "unsigned", .vals = UNSIGNED_DATA },
> +	{ .name = "inverter", .vals = INVERTER_DATA_MSB }
> +};
> +
> +static const struct jh7110_ct_pwmdac pwmdac_ct_data_shift[] = {
> +	{ .name = "left 0 bit", .vals = PWMDAC_DATA_LEFT_SHIFT_BIT_0 },
> +	{ .name = "left 1 bit", .vals = PWMDAC_DATA_LEFT_SHIFT_BIT_1 },
> +	{ .name = "left 2 bit", .vals = PWMDAC_DATA_LEFT_SHIFT_BIT_2 },
> +	{ .name = "left 3 bit", .vals = PWMDAC_DATA_LEFT_SHIFT_BIT_3 },
> +	{ .name = "left 4 bit", .vals = PWMDAC_DATA_LEFT_SHIFT_BIT_4 },
> +	{ .name = "left 5 bit", .vals = PWMDAC_DATA_LEFT_SHIFT_BIT_5 },
> +	{ .name = "left 6 bit", .vals = PWMDAC_DATA_LEFT_SHIFT_BIT_6 },
> +	{ .name = "left 7 bit", .vals = PWMDAC_DATA_LEFT_SHIFT_BIT_7 }
> +};
> +
> +static int jh7110_pwmdac_info(struct snd_ctl_elem_info *uinfo, int pwmdac_ct)
> +{
> +	unsigned int items;
> +
> +	if (pwmdac_ct == PWMDAC_CT_SHIFT) {
> +		items = ARRAY_SIZE(pwmdac_ct_shift);
> +		strcpy(uinfo->value.enumerated.name,
> +		       pwmdac_ct_shift[uinfo->value.enumerated.item].name);
> +	} else if (pwmdac_ct == PWMDAC_CT_DUTY_CYCLE) {
> +		items = ARRAY_SIZE(pwmdac_ct_duty_cycle);
> +		strcpy(uinfo->value.enumerated.name,
> +		       pwmdac_ct_duty_cycle[uinfo->value.enumerated.item].name);
> +	} else if (pwmdac_ct == PWMDAC_CT_DATA_CHANGE) {
> +		items = ARRAY_SIZE(pwmdac_ct_data_change);
> +		strcpy(uinfo->value.enumerated.name,
> +		       pwmdac_ct_data_change[uinfo->value.enumerated.item].name);
> +	} else if (pwmdac_ct == PWMDAC_CT_DATA_MODE) {
> +		items = ARRAY_SIZE(pwmdac_ct_data_mode);
> +		strcpy(uinfo->value.enumerated.name,
> +		       pwmdac_ct_data_mode[uinfo->value.enumerated.item].name);
> +	} else if (pwmdac_ct == PWMDAC_CT_DATA_SHIFT) {
> +		items = ARRAY_SIZE(pwmdac_ct_data_shift);
> +		strcpy(uinfo->value.enumerated.name,
> +		       pwmdac_ct_data_shift[uinfo->value.enumerated.item].name);
> +	}
> +
> +	uinfo->type = SNDRV_CTL_ELEM_TYPE_ENUMERATED;
> +	uinfo->count = 1;
> +	uinfo->value.enumerated.items = items;
> +	if (uinfo->value.enumerated.item >= items)
> +		uinfo->value.enumerated.item = items - 1;
> +
> +	return 0;
> +}
> +
> +static int jh7110_pwmdac_get(struct snd_kcontrol *kcontrol,
> +			     struct snd_ctl_elem_value *ucontrol,
> +			     int pwmdac_ct)
> +{
> +	struct snd_soc_component *component = snd_kcontrol_chip(kcontrol);
> +	struct jh7110_pwmdac_dev *dev = snd_soc_component_get_drvdata(component);
> +
> +	if (pwmdac_ct == PWMDAC_CT_SHIFT)
> +		ucontrol->value.enumerated.item[0] = dev->shift;
> +	else if (pwmdac_ct == PWMDAC_CT_DUTY_CYCLE)
> +		ucontrol->value.enumerated.item[0] = dev->duty_cycle;
> +	else if (pwmdac_ct == PWMDAC_CT_DATA_CHANGE)
> +		ucontrol->value.enumerated.item[0] = dev->data_change;
> +	else if (pwmdac_ct == PWMDAC_CT_DATA_MODE)
> +		ucontrol->value.enumerated.item[0] = dev->data_mode;
> +	else if (pwmdac_ct == PWMDAC_CT_DATA_SHIFT)
> +		ucontrol->value.enumerated.item[0] = dev->data_shift;
> +
> +	return 0;
> +}
> +
> +static int jh7110_pwmdac_put(struct snd_kcontrol *kcontrol,
> +			     struct snd_ctl_elem_value *ucontrol,
> +			     int pwmdac_ct)
> +{
> +	struct snd_soc_component *component = snd_kcontrol_chip(kcontrol);
> +	struct jh7110_pwmdac_dev *dev = snd_soc_component_get_drvdata(component);
> +	int sel = ucontrol->value.enumerated.item[0];
> +	unsigned int items;
> +
> +	if (pwmdac_ct == PWMDAC_CT_SHIFT)
> +		items = ARRAY_SIZE(pwmdac_ct_shift);
> +	else if (pwmdac_ct == PWMDAC_CT_DUTY_CYCLE)
> +		items = ARRAY_SIZE(pwmdac_ct_duty_cycle);
> +	else if (pwmdac_ct == PWMDAC_CT_DATA_CHANGE)
> +		items = ARRAY_SIZE(pwmdac_ct_data_change);
> +	else if (pwmdac_ct == PWMDAC_CT_DATA_MODE)
> +		items = ARRAY_SIZE(pwmdac_ct_data_mode);
> +	else if (pwmdac_ct == PWMDAC_CT_DATA_SHIFT)
> +		items = ARRAY_SIZE(pwmdac_ct_data_shift);
> +
> +	if (sel >= items)
> +		return -EINVAL;
> +
> +	if (pwmdac_ct == PWMDAC_CT_SHIFT)
> +		dev->shift = pwmdac_ct_shift[sel].vals;
> +	else if (pwmdac_ct == PWMDAC_CT_DUTY_CYCLE)
> +		dev->duty_cycle = pwmdac_ct_duty_cycle[sel].vals;
> +	else if (pwmdac_ct == PWMDAC_CT_DATA_CHANGE)
> +		dev->data_change = pwmdac_ct_data_change[sel].vals;
> +	else if (pwmdac_ct == PWMDAC_CT_DATA_MODE)
> +		dev->data_mode = pwmdac_ct_data_mode[sel].vals;
> +	else if (pwmdac_ct == PWMDAC_CT_DATA_SHIFT)
> +		dev->data_shift = pwmdac_ct_data_shift[sel].vals;
> +
> +	return 0;
> +}
> +
> +static int jh7110_pwmdac_shift_info(struct snd_kcontrol *kcontrol,
> +				    struct snd_ctl_elem_info *uinfo)
> +{
> +	return jh7110_pwmdac_info(uinfo, PWMDAC_CT_SHIFT);
> +}
> +
> +static int jh7110_pwmdac_shift_get(struct snd_kcontrol *kcontrol,
> +				   struct snd_ctl_elem_value *ucontrol)
> +{
> +	return jh7110_pwmdac_get(kcontrol, ucontrol, PWMDAC_CT_SHIFT);
> +}
> +
> +static int jh7110_pwmdac_shift_put(struct snd_kcontrol *kcontrol,
> +				   struct snd_ctl_elem_value *ucontrol)
> +{
> +	return jh7110_pwmdac_put(kcontrol, ucontrol, PWMDAC_CT_SHIFT);
> +}
> +
> +static int jh7110_pwmdac_duty_cycle_info(struct snd_kcontrol *kcontrol,
> +					 struct snd_ctl_elem_info *uinfo)
> +{
> +	return jh7110_pwmdac_info(uinfo, PWMDAC_CT_DUTY_CYCLE);
> +}
> +
> +static int jh7110_pwmdac_duty_cycle_get(struct snd_kcontrol *kcontrol,
> +					struct snd_ctl_elem_value *ucontrol)
> +{
> +	return jh7110_pwmdac_get(kcontrol, ucontrol, PWMDAC_CT_DUTY_CYCLE);
> +}
> +
> +static int jh7110_pwmdac_duty_cycle_put(struct snd_kcontrol *kcontrol,
> +					struct snd_ctl_elem_value *ucontrol)
> +{
> +	return jh7110_pwmdac_put(kcontrol, ucontrol, PWMDAC_CT_DUTY_CYCLE);
> +}
> +
> +static int jh7110_pwmdac_data_change_info(struct snd_kcontrol *kcontrol,
> +					  struct snd_ctl_elem_info *uinfo)
> +{
> +	return jh7110_pwmdac_info(uinfo, PWMDAC_CT_DATA_CHANGE);
> +}
> +
> +static int jh7110_pwmdac_data_change_get(struct snd_kcontrol *kcontrol,
> +					 struct snd_ctl_elem_value *ucontrol)
> +{
> +	return jh7110_pwmdac_get(kcontrol, ucontrol, PWMDAC_CT_DATA_CHANGE);
> +}
> +
> +static int jh7110_pwmdac_data_change_put(struct snd_kcontrol *kcontrol,
> +					 struct snd_ctl_elem_value *ucontrol)
> +{
> +	return jh7110_pwmdac_put(kcontrol, ucontrol, PWMDAC_CT_DATA_CHANGE);
> +}
> +
> +static int jh7110_pwmdac_data_mode_info(struct snd_kcontrol *kcontrol,
> +					struct snd_ctl_elem_info *uinfo)
> +{
> +	return jh7110_pwmdac_info(uinfo, PWMDAC_CT_DATA_MODE);
> +}
> +
> +static int jh7110_pwmdac_data_mode_get(struct snd_kcontrol *kcontrol,
> +				       struct snd_ctl_elem_value *ucontrol)
> +{
> +	return jh7110_pwmdac_get(kcontrol, ucontrol, PWMDAC_CT_DATA_MODE);
> +}
> +
> +static int jh7110_pwmdac_data_mode_put(struct snd_kcontrol *kcontrol,
> +				       struct snd_ctl_elem_value *ucontrol)
> +{
> +	return jh7110_pwmdac_put(kcontrol, ucontrol, PWMDAC_CT_DATA_MODE);
> +}
> +
> +static int jh7110_pwmdac_data_shift_info(struct snd_kcontrol *kcontrol,
> +					 struct snd_ctl_elem_info *uinfo)
> +{
> +	return jh7110_pwmdac_info(uinfo, PWMDAC_CT_DATA_SHIFT);
> +}
> +
> +static int jh7110_pwmdac_data_shift_get(struct snd_kcontrol *kcontrol,
> +					struct snd_ctl_elem_value *ucontrol)
> +{
> +	return jh7110_pwmdac_get(kcontrol, ucontrol, PWMDAC_CT_DATA_SHIFT);
> +}
> +
> +static int jh7110_pwmdac_data_shift_put(struct snd_kcontrol *kcontrol,
> +					struct snd_ctl_elem_value *ucontrol)
> +{
> +	return jh7110_pwmdac_put(kcontrol, ucontrol, PWMDAC_CT_DATA_SHIFT);
> +}
> +
> +static inline void jh7110_pwmdac_write_reg(void __iomem *io_base, int reg, u32 val)
> +{
> +	writel(val, io_base + reg);
> +}
> +
> +static inline u32 jh7110_pwmdac_read_reg(void __iomem *io_base, int reg)
> +{
> +	return readl(io_base + reg);
> +}
> +
> +static void jh7110_pwmdac_set_enable(struct jh7110_pwmdac_dev *dev, bool enable)
> +{
> +	u32 value;
> +
> +	value = jh7110_pwmdac_read_reg(dev->base, JH7110_PWMDAC_CTRL);
> +	if (enable)
> +		value |= JH7110_PWMDAC_ENABLE;
> +	else
> +		value &= ~JH7110_PWMDAC_ENABLE;
> +
> +	jh7110_pwmdac_write_reg(dev->base, JH7110_PWMDAC_CTRL, value);
> +}
> +
> +static void jh7110_pwmdac_set_shift(struct jh7110_pwmdac_dev *dev)
> +{
> +	u32 value;
> +
> +	value = jh7110_pwmdac_read_reg(dev->base, JH7110_PWMDAC_CTRL);
> +	if (dev->shift == PWMDAC_SHIFT_8)
> +		value &= ~JH7110_PWMDAC_SHIFT;
> +	else if (dev->shift == PWMDAC_SHIFT_10)
> +		value |= JH7110_PWMDAC_SHIFT;
> +
> +	jh7110_pwmdac_write_reg(dev->base, JH7110_PWMDAC_CTRL, value);
> +}
> +
> +static void jh7110_pwmdac_set_duty_cycle(struct jh7110_pwmdac_dev *dev)
> +{
> +	u32 value;
> +
> +	value = jh7110_pwmdac_read_reg(dev->base, JH7110_PWMDAC_CTRL);
> +	value &= ~JH7110_PWMDAC_DUTY_CYCLE_MASK;
> +	value |= (dev->duty_cycle & 0x3) << JH7110_PWMDAC_DUTY_CYCLE_SHIFT;
> +
> +	jh7110_pwmdac_write_reg(dev->base, JH7110_PWMDAC_CTRL, value);
> +}
> +
> +static void jh7110_pwmdac_set_cnt_n(struct jh7110_pwmdac_dev *dev)
> +{
> +	u32 value;
> +
> +	value = jh7110_pwmdac_read_reg(dev->base, JH7110_PWMDAC_CTRL);
> +	value &= ~JH7110_PWMDAC_CNT_N_MASK;
> +	value |= ((dev->cnt_n - 1) & 0x1ff) << JH7110_PWMDAC_CNT_N_SHIFT;
> +
> +	jh7110_pwmdac_write_reg(dev->base, JH7110_PWMDAC_CTRL, value);
> +}
> +
> +static void jh7110_pwmdac_set_data_change(struct jh7110_pwmdac_dev *dev)
> +{
> +	u32 value;
> +
> +	value = jh7110_pwmdac_read_reg(dev->base, JH7110_PWMDAC_CTRL);
> +	if (dev->data_change == NO_CHANGE)
> +		value &= ~JH7110_PWMDAC_DATA_CHANGE;
> +	else if (dev->data_change == CHANGE)
> +		value |= JH7110_PWMDAC_DATA_CHANGE;
> +
> +	jh7110_pwmdac_write_reg(dev->base, JH7110_PWMDAC_CTRL, value);
> +}
> +
> +static void jh7110_pwmdac_set_data_mode(struct jh7110_pwmdac_dev *dev)
> +{
> +	u32 value;
> +
> +	value = jh7110_pwmdac_read_reg(dev->base, JH7110_PWMDAC_CTRL);
> +	if (dev->data_mode == UNSIGNED_DATA)
> +		value &= ~JH7110_PWMDAC_DATA_MODE;
> +	else if (dev->data_mode == INVERTER_DATA_MSB)
> +		value |= JH7110_PWMDAC_DATA_MODE;
> +
> +	jh7110_pwmdac_write_reg(dev->base, JH7110_PWMDAC_CTRL, value);
> +}
> +
> +static void jh7110_pwmdac_set_data_shift(struct jh7110_pwmdac_dev *dev)
> +{
> +	u32 value;
> +
> +	value = jh7110_pwmdac_read_reg(dev->base, JH7110_PWMDAC_CTRL);
> +	value &= ~JH7110_PWMDAC_DATA_SHIFT_MASK;
> +	value |= (dev->data_shift & 0x7) << JH7110_PWMDAC_DATA_SHIFT_SHIFT;
> +
> +	jh7110_pwmdac_write_reg(dev->base, JH7110_PWMDAC_CTRL, value);
> +}
> +
> +static void jh7110_pwmdac_set(struct jh7110_pwmdac_dev *dev)
> +{
> +	jh7110_pwmdac_set_shift(dev);
> +	jh7110_pwmdac_set_duty_cycle(dev);
> +	jh7110_pwmdac_set_cnt_n(dev);
> +	jh7110_pwmdac_set_enable(dev, true);
> +
> +	jh7110_pwmdac_set_data_change(dev);
> +	jh7110_pwmdac_set_data_mode(dev);
> +	jh7110_pwmdac_set_data_shift(dev);
> +}
> +
> +static void jh7110_pwmdac_stop(struct jh7110_pwmdac_dev *dev)
> +{
> +	jh7110_pwmdac_set_enable(dev, false);
> +}
> +
> +static int jh7110_pwmdac_startup(struct snd_pcm_substream *substream,
> +				 struct snd_soc_dai *dai)
> +{
> +	struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
> +	struct snd_soc_dai_link *dai_link = rtd->dai_link;
> +
> +	dai_link->stop_dma_first = 1;
> +
> +	return 0;
> +}
> +
> +static int jh7110_pwmdac_hw_params(struct snd_pcm_substream *substream,
> +				   struct snd_pcm_hw_params *params,
> +				   struct snd_soc_dai *dai)
> +{
> +	unsigned long core_clk_rate;
> +	int ret;
> +	struct jh7110_pwmdac_dev *dev = dev_get_drvdata(dai->dev);
> +
> +	switch (params_rate(params)) {
> +	case 8000:
> +		dev->cnt_n = PWMDAC_SAMPLE_CNT_3;
> +		core_clk_rate = 6144000;
> +		break;
> +	case 11025:
> +		dev->cnt_n = PWMDAC_SAMPLE_CNT_2;
> +		core_clk_rate = 5644800;
> +		break;
> +	case 16000:
> +		dev->cnt_n = PWMDAC_SAMPLE_CNT_3;
> +		core_clk_rate = 12288000;
> +		break;
> +	case 22050:
> +		dev->cnt_n = PWMDAC_SAMPLE_CNT_1;
> +		core_clk_rate = 5644800;
> +		break;
> +	case 32000:
> +		dev->cnt_n = PWMDAC_SAMPLE_CNT_1;
> +		core_clk_rate = 8192000;
> +		break;
> +	case 44100:
> +		dev->cnt_n = PWMDAC_SAMPLE_CNT_1;
> +		core_clk_rate = 11289600;
> +		break;
> +	case 48000:
> +		dev->cnt_n = PWMDAC_SAMPLE_CNT_1;
> +		core_clk_rate = 12288000;
> +		break;
> +	default:
> +		dev_err(dai->dev, "%d rate not supported\n",
> +			params_rate(params));
> +		return -EINVAL;
> +	}
> +
> +	switch (params_channels(params)) {
> +	case 1:
> +		dev->play_dma_data.addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
> +		break;
> +	case 2:
> +		dev->play_dma_data.addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
> +		break;
> +	default:
> +		dev_err(dai->dev, "%d channels not supported\n",
> +			params_channels(params));
> +		return -EINVAL;
> +	}
> +
> +	/*
> +	 * The clock rate always rounds down when using clk_set_rate()
> +	 * so increase the rate a bit
> +	 */
> +	core_clk_rate += 64;
> +	jh7110_pwmdac_set(dev);
> +
> +	ret = clk_set_rate(dev->clks[1].clk, core_clk_rate);
> +	if (ret) {
> +		dev_err(dai->dev,
> +			"failed to set rate %lu for core clock\n",
> +			core_clk_rate);
> +		return ret;
> +	}
> +
> +	return 0;
> +}
> +
> +static int jh7110_pwmdac_trigger(struct snd_pcm_substream *substream, int cmd,
> +				 struct snd_soc_dai *dai)
> +{
> +	struct jh7110_pwmdac_dev *dev = 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:
> +		jh7110_pwmdac_set(dev);
> +		break;
> +
> +	case SNDRV_PCM_TRIGGER_STOP:
> +	case SNDRV_PCM_TRIGGER_SUSPEND:
> +	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
> +		jh7110_pwmdac_stop(dev);
> +		break;
> +	default:
> +		ret = -EINVAL;
> +		break;
> +	}
> +
> +	return ret;
> +}
> +
> +static int jh7110_pwmdac_crg_enable(struct jh7110_pwmdac_dev *dev, bool enable)
> +{
> +	int ret;
> +
> +	if (enable) {
> +		ret = clk_bulk_prepare_enable(ARRAY_SIZE(dev->clks), dev->clks);
> +		if (ret) {
> +			dev_err(dev->dev, "failed to enable pwmdac clocks\n");
> +			return ret;
> +		}
> +
> +		ret = reset_control_deassert(dev->rst_apb);
> +		if (ret) {
> +			dev_err(dev->dev, "failed to deassert pwmdac apb reset\n");
> +			goto err_rst_apb;
> +		}
> +	} else {
> +		clk_bulk_disable_unprepare(ARRAY_SIZE(dev->clks), dev->clks);
> +	}
> +
> +	return 0;
> +
> +err_rst_apb:
> +	clk_bulk_disable_unprepare(ARRAY_SIZE(dev->clks), dev->clks);
> +
> +	return ret;
> +}
> +
> +static int jh7110_pwmdac_dai_probe(struct snd_soc_dai *dai)
> +{
> +	struct jh7110_pwmdac_dev *dev = dev_get_drvdata(dai->dev);
> +
> +	dev->play_dma_data.addr = dev->mapbase + JH7110_PWMDAC_WDATA;
> +	dev->play_dma_data.addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
> +	dev->play_dma_data.fifo_size = 1;
> +	dev->play_dma_data.maxburst = 16;
> +
> +	snd_soc_dai_init_dma_data(dai, &dev->play_dma_data, NULL);
> +	snd_soc_dai_set_drvdata(dai, dev);
> +
> +	return 0;
> +}
> +
> +#define JH7110_PWMDAC_ENUM_DECL(xname, xinfo, xget, xput) \
> +{	.iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, \
> +	.info = xinfo, .get = xget, .put = xput,}
> +
> +static const struct snd_kcontrol_new jh7110_pwmdac_snd_controls[] = {
> +	JH7110_PWMDAC_ENUM_DECL("shift", jh7110_pwmdac_shift_info,
> +				jh7110_pwmdac_shift_get,
> +				jh7110_pwmdac_shift_put),
> +	JH7110_PWMDAC_ENUM_DECL("duty_cycle", jh7110_pwmdac_duty_cycle_info,
> +				jh7110_pwmdac_duty_cycle_get,
> +				jh7110_pwmdac_duty_cycle_put),
> +	JH7110_PWMDAC_ENUM_DECL("data_change", jh7110_pwmdac_data_change_info,
> +				jh7110_pwmdac_data_change_get,
> +				jh7110_pwmdac_data_change_put),
> +	JH7110_PWMDAC_ENUM_DECL("data_mode", jh7110_pwmdac_data_mode_info,
> +				jh7110_pwmdac_data_mode_get,
> +				jh7110_pwmdac_data_mode_put),
> +	JH7110_PWMDAC_ENUM_DECL("data_shift", jh7110_pwmdac_data_shift_info,
> +				jh7110_pwmdac_data_shift_get,
> +				jh7110_pwmdac_data_shift_put),
> +};
> +
> +static int jh7110_pwmdac_component_probe(struct snd_soc_component *component)
> +{
> +	snd_soc_add_component_controls(component, jh7110_pwmdac_snd_controls,
> +				       ARRAY_SIZE(jh7110_pwmdac_snd_controls));
> +	return 0;
> +}
> +
> +static const struct snd_soc_dai_ops jh7110_pwmdac_dai_ops = {
> +	.startup	= jh7110_pwmdac_startup,
> +	.hw_params	= jh7110_pwmdac_hw_params,
> +	.trigger	= jh7110_pwmdac_trigger,
> +};
> +
> +static const struct snd_soc_component_driver jh7110_pwmdac_component = {
> +	.name		= "jh7110-pwmdac",
> +	.probe		= jh7110_pwmdac_component_probe,
> +};
> +
> +static struct snd_soc_dai_driver jh7110_pwmdac_dai = {
> +	.name		= "jh7110-pwmdac",
> +	.id		= 0,
> +	.probe		= jh7110_pwmdac_dai_probe,
> +	.playback = {
> +		.channels_min = 1,
> +		.channels_max = 2,
> +		.rates = SNDRV_PCM_RATE_8000_48000,
> +		.formats = SNDRV_PCM_FMTBIT_S16_LE,
> +	},
> +	.ops = &jh7110_pwmdac_dai_ops,
> +};
> +
> +static int jh7110_pwmdac_runtime_suspend(struct device *dev)
> +{
> +	struct jh7110_pwmdac_dev *pwmdac = dev_get_drvdata(dev);
> +
> +	return jh7110_pwmdac_crg_enable(pwmdac, false);
> +}
> +
> +static int jh7110_pwmdac_runtime_resume(struct device *dev)
> +{
> +	struct jh7110_pwmdac_dev *pwmdac = dev_get_drvdata(dev);
> +
> +	return jh7110_pwmdac_crg_enable(pwmdac, true);
> +}
> +
> +static int jh7110_pwmdac_system_suspend(struct device *dev)
> +{
> +	struct jh7110_pwmdac_dev *pwmdac = dev_get_drvdata(dev);
> +
> +	/* save the CTRL register value */
> +	pwmdac->saved_ctrl = jh7110_pwmdac_read_reg(pwmdac->base,
> +						    JH7110_PWMDAC_CTRL);
> +	return pm_runtime_force_suspend(dev);
> +}
> +
> +static int jh7110_pwmdac_system_resume(struct device *dev)
> +{
> +	struct jh7110_pwmdac_dev *pwmdac = dev_get_drvdata(dev);
> +	int ret;
> +
> +	ret = pm_runtime_force_resume(dev);
> +	if (ret)
> +		return ret;
> +
> +	/* restore the CTRL register value */
> +	jh7110_pwmdac_write_reg(pwmdac->base, JH7110_PWMDAC_CTRL,
> +				pwmdac->saved_ctrl);
> +	return 0;
> +}
> +
> +static const struct dev_pm_ops jh7110_pwmdac_pm_ops = {
> +	RUNTIME_PM_OPS(jh7110_pwmdac_runtime_suspend,
> +		       jh7110_pwmdac_runtime_resume, NULL)
> +	SYSTEM_SLEEP_PM_OPS(jh7110_pwmdac_system_suspend,
> +			    jh7110_pwmdac_system_resume)
> +};
> +
> +static int jh7110_pwmdac_probe(struct platform_device *pdev)
> +{
> +	struct jh7110_pwmdac_dev *dev;
> +	struct resource *res;
> +	int ret;
> +
> +	dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL);
> +	if (!dev)
> +		return -ENOMEM;
> +
> +	dev->base = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
> +	if (IS_ERR(dev->base))
> +		return PTR_ERR(dev->base);
> +
> +	dev->mapbase = res->start;
> +
> +	dev->clks[0].id = "apb";
> +	dev->clks[1].id = "core";
> +
> +	ret = devm_clk_bulk_get(&pdev->dev, ARRAY_SIZE(dev->clks), dev->clks);
> +	if (ret) {
> +		dev_err(&pdev->dev, "failed to get pwmdac clocks\n");
> +		return ret;
> +	}
> +
> +	dev->rst_apb = devm_reset_control_get_exclusive(&pdev->dev, NULL);
> +	if (IS_ERR(dev->rst_apb)) {
> +		dev_err(&pdev->dev, "failed to get pwmdac apb reset\n");
> +		return PTR_ERR(dev->rst_apb);
> +	}
> +
> +	dev->dev = &pdev->dev;
> +	dev->shift = PWMDAC_SHIFT_8;
> +	dev->duty_cycle = PWMDAC_CYCLE_CENTER;
> +	dev->cnt_n = PWMDAC_SAMPLE_CNT_1;
> +	dev->data_change = NO_CHANGE;
> +	dev->data_mode = INVERTER_DATA_MSB;
> +	dev->data_shift = PWMDAC_DATA_LEFT_SHIFT_BIT_0;
> +
> +	dev_set_drvdata(&pdev->dev, dev);
> +	ret = devm_snd_soc_register_component(&pdev->dev,
> +					      &jh7110_pwmdac_component,
> +					      &jh7110_pwmdac_dai, 1);
> +	if (ret) {
> +		dev_err(&pdev->dev, "failed to register dai\n");
> +		return ret;
> +	}
> +
> +	ret = devm_snd_dmaengine_pcm_register(&pdev->dev, NULL, 0);
> +	if (ret) {
> +		dev_err(&pdev->dev, "failed to register pcm\n");
> +		return ret;
> +	}
> +
> +	pm_runtime_enable(dev->dev);
> +	if (!pm_runtime_enabled(&pdev->dev)) {
> +		ret = jh7110_pwmdac_runtime_resume(&pdev->dev);
> +		if (ret)
> +			goto err_pm_disable;
> +	}
> +
> +	return 0;
> +
> +err_pm_disable:
> +	pm_runtime_disable(&pdev->dev);
> +
> +	return ret;
> +}
> +
> +static int jh7110_pwmdac_remove(struct platform_device *pdev)
> +{
> +	pm_runtime_disable(&pdev->dev);
> +	return 0;
> +}
> +
> +static const struct of_device_id jh7110_pwmdac_of_match[] = {
> +	{ .compatible = "starfive,jh7110-pwmdac" },
> +	{ /* sentinel */ }
> +};
> +MODULE_DEVICE_TABLE(of, jh7110_pwmdac_of_match);
> +
> +static struct platform_driver jh7110_pwmdac_driver = {
> +	.driver		= {
> +		.name	= "jh7110-pwmdac",
> +		.of_match_table = jh7110_pwmdac_of_match,
> +		.pm = pm_ptr(&jh7110_pwmdac_pm_ops),
> +	},
> +	.probe		= jh7110_pwmdac_probe,
> +	.remove		= jh7110_pwmdac_remove,
> +};
> +module_platform_driver(jh7110_pwmdac_driver);
> +
> +MODULE_AUTHOR("Jenny Zhang");
> +MODULE_AUTHOR("Curry Zhang");
> +MODULE_AUTHOR("Xingyu Wu <xingyu.wu@xxxxxxxxxxxxxxxx>");
> +MODULE_AUTHOR("Hal Feng <hal.feng@xxxxxxxxxxxxxxxx>");
> +MODULE_DESCRIPTION("StarFive JH7110 PWM-DAC driver");
> +MODULE_LICENSE("GPL");