diff mbox series

[1/7] iio: adc: rockchip_saradc: Add support for RK3588

Message ID 20230516230051.14846-2-shreeya.patel@collabora.com (mailing list archive)
State New, archived
Headers show
Series RK3588 ADC support | expand

Commit Message

Shreeya Patel May 16, 2023, 11 p.m. UTC 
Refactor conversion operation to support rk3588 saradc and
add separate start, read, powerdown in respective hooks.

Signed-off-by: Simon Xue <xxm@rock-chips.com>
Signed-off-by: Shreeya Patel <shreeya.patel@collabora.com>
---
 drivers/iio/adc/rockchip_saradc.c | 127 +++++++++++++++++++++++++++---
 1 file changed, 115 insertions(+), 12 deletions(-)

Comments

AngeloGioacchino Del Regno May 17, 2023, 10:32 a.m. UTC | #1 
Il 17/05/23 01:00, Shreeya Patel ha scritto:
> Refactor conversion operation to support rk3588 saradc and
> add separate start, read, powerdown in respective hooks.
> 
> Signed-off-by: Simon Xue <xxm@rock-chips.com>
> Signed-off-by: Shreeya Patel <shreeya.patel@collabora.com>
> ---
>   drivers/iio/adc/rockchip_saradc.c | 127 +++++++++++++++++++++++++++---
>   1 file changed, 115 insertions(+), 12 deletions(-)
> 
> diff --git a/drivers/iio/adc/rockchip_saradc.c b/drivers/iio/adc/rockchip_saradc.c
> index 79448c5ffc2a..ac6fdf8e673b 100644
> --- a/drivers/iio/adc/rockchip_saradc.c
> +++ b/drivers/iio/adc/rockchip_saradc.c
> @@ -38,10 +38,29 @@
>   #define SARADC_TIMEOUT			msecs_to_jiffies(100)
>   #define SARADC_MAX_CHANNELS		8
>   
> +/* v2 registers */
> +#define SARADC2_CONV_CON		0x0
> +#define SARADC_T_PD_SOC			0x4
> +#define SARADC_T_DAS_SOC		0xc
> +#define SARADC2_END_INT_EN		0x104
> +#define SARADC2_ST_CON			0x108
> +#define SARADC2_STATUS			0x10c
> +#define SARADC2_END_INT_ST		0x110
> +#define SARADC2_DATA_BASE		0x120
> +
> +#define SARADC2_EN_END_INT		BIT(0)
> +#define SARADC2_START			BIT(4)
> +#define SARADC2_SINGLE_MODE		BIT(5)
> +
> +struct rockchip_saradc;
> +
>   struct rockchip_saradc_data {
>   	const struct iio_chan_spec	*channels;
>   	int				num_channels;
>   	unsigned long			clk_rate;
> +	void (*start)(struct rockchip_saradc *info, int chn);
> +	int (*read)(struct rockchip_saradc *info);
> +	void (*power_down)(struct rockchip_saradc *info);
>   };
>   
>   struct rockchip_saradc {
> @@ -60,27 +79,77 @@ struct rockchip_saradc {
>   	struct notifier_block nb;
>   };
>   
> -static void rockchip_saradc_power_down(struct rockchip_saradc *info)
> +static void rockchip_saradc_reset_controller(struct reset_control *reset);
> +
> +static void rockchip_saradc_start_v1(struct rockchip_saradc *info, int chn)
> +{
> +	/* 8 clock periods as delay between power up and start cmd */
> +	writel_relaxed(8, info->regs + SARADC_DLY_PU_SOC);
> +	/* Select the channel to be used and trigger conversion */
> +	writel(SARADC_CTRL_POWER_CTRL | (chn & SARADC_CTRL_CHN_MASK) |
> +	       SARADC_CTRL_IRQ_ENABLE, info->regs + SARADC_CTRL);
> +}
> +
> +static void rockchip_saradc_start_v2(struct rockchip_saradc *info, int chn)
> +{
> +	int val;
> +
> +	if (info->reset)
> +		rockchip_saradc_reset_controller(info->reset);
> +
> +	writel_relaxed(0xc, info->regs + SARADC_T_DAS_SOC);
> +	writel_relaxed(0x20, info->regs + SARADC_T_PD_SOC);
> +	val = SARADC2_EN_END_INT << 16 | SARADC2_EN_END_INT;

What about using bitfield macros?

/* "LO" and "HI" may get a better name, if there's any possible one! */
#define SARADC2_EN_END_INT_LO BIT(0)
#define SARADC2_EN_END_INT_HI BIT(16)

val = FIELD_PREP(SARADC_EN_END_INT_LO, 1);
val |= FIELD_PREP(SARADC_EN_END_INT_HI, 1);
writel ....

Otherwise, if it's about two really "specular" instances, you can probably
keep the current definition as SARADC2_EN_END_INT and do

val = FIELD_PREP(SARADC_EN_END_INT, 1);
val |= val << 16;
writel ...

/* note: high, low bits are unknown to me, I assumed it's 16 bits :-) */
#define SARADC2_CONV_CHANNELS GENMASK(15, 0)

val = FIELD_PREP(SARADC2_START, 1);
val |= FIELD_PREP(SARADC2_SINGLE_MODE, 1);
val |= FIELD_PREP(SARADC2_CONV_CHANNELS, chn);
val |= val << 16;
writel ...


> +	writel_relaxed(val, info->regs + SARADC2_END_INT_EN);
> +	val = SARADC2_START | SARADC2_SINGLE_MODE | chn;
> +	writel(val << 16 | val, info->regs + SARADC2_CONV_CON);
> +}
> +

Cheers,
Angelo
Jonathan Cameron May 20, 2023, 3:57 p.m. UTC | #2 
On Wed, 17 May 2023 04:30:45 +0530
Shreeya Patel <shreeya.patel@collabora.com> wrote:

> Refactor conversion operation to support rk3588 saradc and
> add separate start, read, powerdown in respective hooks.
> 
> Signed-off-by: Simon Xue <xxm@rock-chips.com>
> Signed-off-by: Shreeya Patel <shreeya.patel@collabora.com>
Hi Shreeya,

This particular chain of tags has unclear authorship.
If Simon wrote the driver, then the author (from address) of the
patch should be Simon's.  If it is a codeveloped situation look
at how to use the co-developed-by tag


Generally the nicest way to add new callbacks is to do them in their
own patch.  Then introduce new devices with different callbacks in a follow
on patch.  That means the first one can be reviewed to ensure there
is no functional change separate from the new code in the following patch.



> +static const struct rockchip_saradc_data rk3588_saradc_data = {
> +	.channels = rockchip_rk3588_saradc_iio_channels,
> +	.num_channels = ARRAY_SIZE(rockchip_rk3588_saradc_iio_channels),
> +	.clk_rate = 1000000,
> +	.start = rockchip_saradc_start_v2,

As mentioned above, I'd like to see the changes for old devices done in patch
1 and the support for new device in a new patch.

> +	.read = rockchip_saradc_read_v2,
>  };
diff mbox series

Patch

diff --git a/drivers/iio/adc/rockchip_saradc.c b/drivers/iio/adc/rockchip_saradc.c
index 79448c5ffc2a..ac6fdf8e673b 100644
--- a/drivers/iio/adc/rockchip_saradc.c
+++ b/drivers/iio/adc/rockchip_saradc.c
@@ -38,10 +38,29 @@ 
 #define SARADC_TIMEOUT			msecs_to_jiffies(100)
 #define SARADC_MAX_CHANNELS		8
 
+/* v2 registers */
+#define SARADC2_CONV_CON		0x0
+#define SARADC_T_PD_SOC			0x4
+#define SARADC_T_DAS_SOC		0xc
+#define SARADC2_END_INT_EN		0x104
+#define SARADC2_ST_CON			0x108
+#define SARADC2_STATUS			0x10c
+#define SARADC2_END_INT_ST		0x110
+#define SARADC2_DATA_BASE		0x120
+
+#define SARADC2_EN_END_INT		BIT(0)
+#define SARADC2_START			BIT(4)
+#define SARADC2_SINGLE_MODE		BIT(5)
+
+struct rockchip_saradc;
+
 struct rockchip_saradc_data {
 	const struct iio_chan_spec	*channels;
 	int				num_channels;
 	unsigned long			clk_rate;
+	void (*start)(struct rockchip_saradc *info, int chn);
+	int (*read)(struct rockchip_saradc *info);
+	void (*power_down)(struct rockchip_saradc *info);
 };
 
 struct rockchip_saradc {
@@ -60,27 +79,77 @@  struct rockchip_saradc {
 	struct notifier_block nb;
 };
 
-static void rockchip_saradc_power_down(struct rockchip_saradc *info)
+static void rockchip_saradc_reset_controller(struct reset_control *reset);
+
+static void rockchip_saradc_start_v1(struct rockchip_saradc *info, int chn)
+{
+	/* 8 clock periods as delay between power up and start cmd */
+	writel_relaxed(8, info->regs + SARADC_DLY_PU_SOC);
+	/* Select the channel to be used and trigger conversion */
+	writel(SARADC_CTRL_POWER_CTRL | (chn & SARADC_CTRL_CHN_MASK) |
+	       SARADC_CTRL_IRQ_ENABLE, info->regs + SARADC_CTRL);
+}
+
+static void rockchip_saradc_start_v2(struct rockchip_saradc *info, int chn)
+{
+	int val;
+
+	if (info->reset)
+		rockchip_saradc_reset_controller(info->reset);
+
+	writel_relaxed(0xc, info->regs + SARADC_T_DAS_SOC);
+	writel_relaxed(0x20, info->regs + SARADC_T_PD_SOC);
+	val = SARADC2_EN_END_INT << 16 | SARADC2_EN_END_INT;
+	writel_relaxed(val, info->regs + SARADC2_END_INT_EN);
+	val = SARADC2_START | SARADC2_SINGLE_MODE | chn;
+	writel(val << 16 | val, info->regs + SARADC2_CONV_CON);
+}
+
+static void rockchip_saradc_start(struct rockchip_saradc *info, int chn)
+{
+	info->data->start(info, chn);
+}
+
+static int rockchip_saradc_read_v1(struct rockchip_saradc *info)
+{
+	return readl_relaxed(info->regs + SARADC_DATA);
+}
+
+static int rockchip_saradc_read_v2(struct rockchip_saradc *info)
+{
+	int offset;
+
+	/* Clear irq */
+	writel_relaxed(0x1, info->regs + SARADC2_END_INT_ST);
+
+	offset = SARADC2_DATA_BASE + info->last_chan->channel * 0x4;
+
+	return readl_relaxed(info->regs + offset);
+}
+
+static int rockchip_saradc_read(struct rockchip_saradc *info)
+{
+	return info->data->read(info);
+}
+
+static void rockchip_saradc_power_down_v1(struct rockchip_saradc *info)
 {
-	/* Clear irq & power down adc */
 	writel_relaxed(0, info->regs + SARADC_CTRL);
 }
 
+static void rockchip_saradc_power_down(struct rockchip_saradc *info)
+{
+	if (info->data->power_down)
+		info->data->power_down(info);
+}
+
 static int rockchip_saradc_conversion(struct rockchip_saradc *info,
 				   struct iio_chan_spec const *chan)
 {
 	reinit_completion(&info->completion);
 
-	/* 8 clock periods as delay between power up and start cmd */
-	writel_relaxed(8, info->regs + SARADC_DLY_PU_SOC);
-
 	info->last_chan = chan;
-
-	/* Select the channel to be used and trigger conversion */
-	writel(SARADC_CTRL_POWER_CTRL
-			| (chan->channel & SARADC_CTRL_CHN_MASK)
-			| SARADC_CTRL_IRQ_ENABLE,
-		   info->regs + SARADC_CTRL);
+	rockchip_saradc_start(info, chan->channel);
 
 	if (!wait_for_completion_timeout(&info->completion, SARADC_TIMEOUT))
 		return -ETIMEDOUT;
@@ -123,7 +192,7 @@  static irqreturn_t rockchip_saradc_isr(int irq, void *dev_id)
 	struct rockchip_saradc *info = dev_id;
 
 	/* Read value */
-	info->last_val = readl_relaxed(info->regs + SARADC_DATA);
+	info->last_val = rockchip_saradc_read(info);
 	info->last_val &= GENMASK(info->last_chan->scan_type.realbits - 1, 0);
 
 	rockchip_saradc_power_down(info);
@@ -163,6 +232,9 @@  static const struct rockchip_saradc_data saradc_data = {
 	.channels = rockchip_saradc_iio_channels,
 	.num_channels = ARRAY_SIZE(rockchip_saradc_iio_channels),
 	.clk_rate = 1000000,
+	.start = rockchip_saradc_start_v1,
+	.read = rockchip_saradc_read_v1,
+	.power_down = rockchip_saradc_power_down_v1,
 };
 
 static const struct iio_chan_spec rockchip_rk3066_tsadc_iio_channels[] = {
@@ -174,6 +246,9 @@  static const struct rockchip_saradc_data rk3066_tsadc_data = {
 	.channels = rockchip_rk3066_tsadc_iio_channels,
 	.num_channels = ARRAY_SIZE(rockchip_rk3066_tsadc_iio_channels),
 	.clk_rate = 50000,
+	.start = rockchip_saradc_start_v1,
+	.read = rockchip_saradc_read_v1,
+	.power_down = rockchip_saradc_power_down_v1,
 };
 
 static const struct iio_chan_spec rockchip_rk3399_saradc_iio_channels[] = {
@@ -189,6 +264,9 @@  static const struct rockchip_saradc_data rk3399_saradc_data = {
 	.channels = rockchip_rk3399_saradc_iio_channels,
 	.num_channels = ARRAY_SIZE(rockchip_rk3399_saradc_iio_channels),
 	.clk_rate = 1000000,
+	.start = rockchip_saradc_start_v1,
+	.read = rockchip_saradc_read_v1,
+	.power_down = rockchip_saradc_power_down_v1,
 };
 
 static const struct iio_chan_spec rockchip_rk3568_saradc_iio_channels[] = {
@@ -206,6 +284,28 @@  static const struct rockchip_saradc_data rk3568_saradc_data = {
 	.channels = rockchip_rk3568_saradc_iio_channels,
 	.num_channels = ARRAY_SIZE(rockchip_rk3568_saradc_iio_channels),
 	.clk_rate = 1000000,
+	.start = rockchip_saradc_start_v1,
+	.read = rockchip_saradc_read_v1,
+	.power_down = rockchip_saradc_power_down_v1,
+};
+
+static const struct iio_chan_spec rockchip_rk3588_saradc_iio_channels[] = {
+	SARADC_CHANNEL(0, "adc0", 12),
+	SARADC_CHANNEL(1, "adc1", 12),
+	SARADC_CHANNEL(2, "adc2", 12),
+	SARADC_CHANNEL(3, "adc3", 12),
+	SARADC_CHANNEL(4, "adc4", 12),
+	SARADC_CHANNEL(5, "adc5", 12),
+	SARADC_CHANNEL(6, "adc6", 12),
+	SARADC_CHANNEL(7, "adc7", 12),
+};
+
+static const struct rockchip_saradc_data rk3588_saradc_data = {
+	.channels = rockchip_rk3588_saradc_iio_channels,
+	.num_channels = ARRAY_SIZE(rockchip_rk3588_saradc_iio_channels),
+	.clk_rate = 1000000,
+	.start = rockchip_saradc_start_v2,
+	.read = rockchip_saradc_read_v2,
 };
 
 static const struct of_device_id rockchip_saradc_match[] = {
@@ -221,6 +321,9 @@  static const struct of_device_id rockchip_saradc_match[] = {
 	}, {
 		.compatible = "rockchip,rk3568-saradc",
 		.data = &rk3568_saradc_data,
+	}, {
+		.compatible = "rockchip,rk3588-saradc",
+		.data = &rk3588_saradc_data,
 	},
 	{},
 };