[PATCH 11/16] rockchip: adc: rockchip-saradc: add support for RK3588

[Quentin Schulz]

From: Quentin Schulz <quentin.schulz at theobroma-systems.com>

This adds support for the SARADCv2 found on RK3588.

There is no stop callback as it is currently configured in single
conversion mode, where the ADC is powered down after a single conversion
has been made.

Cc: Quentin Schulz <foss+uboot at 0leil.net>
Signed-off-by: Quentin Schulz <quentin.schulz at theobroma-systems.com>
---
 drivers/adc/rockchip-saradc.c | 76 ++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 75 insertions(+), 1 deletion(-)

diff --git a/drivers/adc/rockchip-saradc.c b/drivers/adc/rockchip-saradc.c
index b5df58fe3eb..05c93cedcf1 100644
--- a/drivers/adc/rockchip-saradc.c
+++ b/drivers/adc/rockchip-saradc.c
@@ -10,7 +10,8 @@
 #include <clk.h>
 #include <dm.h>
 #include <errno.h>
-#include <asm/io.h>
+#include <asm/arch-rockchip/hardware.h>
+#include <linux/bitfield.h>
 #include <linux/bitops.h>
 #include <linux/err.h>
 #include <linux/printk.h>
@@ -30,8 +31,37 @@ struct rockchip_saradc_regs_v1 {
 	unsigned int dly_pu_soc;
 };
 
+struct rockchip_saradc_regs_v2 {
+	unsigned int conv_con;
+#define SARADC2_SINGLE_MODE	BIT(5)
+#define SARADC2_START		BIT(4)
+#define SARADC2_CONV_CHANNELS	GENMASK(3, 0)
+	unsigned int t_pd_soc;
+	unsigned int t_as_soc;
+	unsigned int t_das_soc;
+	unsigned int t_sel_soc;
+	unsigned int high_comp[16];
+	unsigned int low_comp[16];
+	unsigned int debounce;
+	unsigned int ht_int_en;
+	unsigned int lt_int_en;
+	unsigned int reserved[24];
+	unsigned int mt_int_en;
+	unsigned int end_int_en;
+#define SARADC2_EN_END_INT	BIT(0)
+	unsigned int st_con;
+	unsigned int status;
+	unsigned int end_int_st;
+	unsigned int ht_int_st;
+	unsigned int lt_int_st;
+	unsigned int mt_int_st;
+	unsigned int data[16];
+	unsigned int auto_ch_en;
+};
+
 union rockchip_saradc_regs {
 	struct rockchip_saradc_regs_v1	*v1;
+	struct rockchip_saradc_regs_v2	*v2;
 };
 struct rockchip_saradc_data {
 	int				num_bits;
@@ -66,6 +96,22 @@ int rockchip_saradc_channel_data_v1(struct udevice *dev, int channel,
 	return 0;
 }
 
+int rockchip_saradc_channel_data_v2(struct udevice *dev, int channel,
+				    unsigned int *data)
+{
+	struct rockchip_saradc_priv *priv = dev_get_priv(dev);
+
+	if (!(readl(&priv->regs.v2->end_int_st) & SARADC2_EN_END_INT))
+		return -EBUSY;
+
+	/* Read value */
+	*data = readl(&priv->regs.v2->data[channel]);
+
+	/* Acknowledge the interrupt */
+	writel(SARADC2_EN_END_INT, &priv->regs.v2->end_int_st);
+
+	return 0;
+}
 int rockchip_saradc_channel_data(struct udevice *dev, int channel,
 				 unsigned int *data)
 {
@@ -104,6 +150,24 @@ int rockchip_saradc_start_channel_v1(struct udevice *dev, int channel)
 	return 0;
 }
 
+int rockchip_saradc_start_channel_v2(struct udevice *dev, int channel)
+{
+	struct rockchip_saradc_priv *priv = dev_get_priv(dev);
+
+	writel(0xc, &priv->regs.v2->t_das_soc);
+	writel(0x20, &priv->regs.v2->t_pd_soc);
+
+	/* Acknowledge any previous interrupt */
+	writel(SARADC2_EN_END_INT, &priv->regs.v2->end_int_st);
+
+	rk_setreg(&priv->regs.v2->conv_con,
+		  FIELD_PREP(SARADC2_CONV_CHANNELS, channel) |
+		  FIELD_PREP(SARADC2_START, 1) |
+		  FIELD_PREP(SARADC2_SINGLE_MODE, 1));
+
+	return 0;
+}
+
 int rockchip_saradc_start_channel(struct udevice *dev, int channel)
 {
 	struct rockchip_saradc_priv *priv = dev_get_priv(dev);
@@ -247,6 +311,14 @@ static const struct rockchip_saradc_data rk3399_saradc_data = {
 	.stop = rockchip_saradc_stop_v1,
 };
 
+static const struct rockchip_saradc_data rk3588_saradc_data = {
+	.num_bits = 12,
+	.num_channels = 8,
+	.clk_rate = 1000000,
+	.channel_data = rockchip_saradc_channel_data_v2,
+	.start_channel = rockchip_saradc_start_channel_v2,
+};
+
 static const struct udevice_id rockchip_saradc_ids[] = {
 	{ .compatible = "rockchip,saradc",
 	  .data = (ulong)&saradc_data },
@@ -254,6 +326,8 @@ static const struct udevice_id rockchip_saradc_ids[] = {
 	  .data = (ulong)&rk3066_tsadc_data },
 	{ .compatible = "rockchip,rk3399-saradc",
 	  .data = (ulong)&rk3399_saradc_data },
+	{ .compatible = "rockchip,rk3588-saradc",
+	  .data = (ulong)&rk3588_saradc_data },
 	{ }
 };
 

-- 
2.43.2