thermal/drivers/tsens: Add TSENS enable and calibration support for V2

SoCs without RPM need to enable sensors and calibrate them from the kernel.
The IPQ5332 and IPQ5424 use the tsens v2.3.3 IP and do not have RPM.
Therefore, add a new calibration function for V2, as the tsens.c calib
function only supports V1. Also add new feature_config, ops and data for
IPQ5332, IPQ5424.

Although the TSENS IP supports 16 sensors, not all are used. The hw_id
is used to enable the relevant sensors.

Reviewed-by: Dmitry Baryshkov <[e-mail]>
Signed-off-by: Praveenkumar I <[e-mail]>
Signed-off-by: Manikanta Mylavarapu <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Daniel Lezcano <[e-mail]>

drivers/thermal/qcom/tsens-v2.c

···
  * Copyright (c) 2018, Linaro Limited
  */
 
+#include <linux/bitfield.h>
 #include <linux/bitops.h>
+#include <linux/nvmem-consumer.h>
 #include <linux/regmap.h>
 #include "tsens.h"
 
 /* ----- SROT ------ */
 #define SROT_HW_VER_OFF	0x0000
 #define SROT_CTRL_OFF		0x0004
+#define SROT_MEASURE_PERIOD	0x0008
+#define SROT_Sn_CONVERSION	0x0060
+#define V2_SHIFT_DEFAULT	0x0003
+#define V2_SLOPE_DEFAULT	0x0cd0
+#define V2_CZERO_DEFAULT	0x016a
+#define ONE_PT_SLOPE		0x0cd0
+#define TWO_PT_SHIFTED_GAIN	921600
+#define ONE_PT_CZERO_CONST	94
+#define SW_RST_DEASSERT		0x0
+#define SW_RST_ASSERT		0x1
+#define MEASURE_PERIOD_2mSEC	0x1
+#define RESULT_FORMAT_TEMP	0x1
+#define TSENS_ENABLE		0x1
+#define SENSOR_CONVERSION(n)	(((n) * 4) + SROT_Sn_CONVERSION)
+#define CONVERSION_SHIFT_MASK	GENMASK(24, 23)
+#define CONVERSION_SLOPE_MASK	GENMASK(22, 10)
+#define CONVERSION_CZERO_MASK	GENMASK(9, 0)
 
 /* ----- TM ------ */
 #define TM_INT_EN_OFF			0x0004
···
 	.trip_max_temp	= 204000,
 };
 
+static struct tsens_features ipq5332_feat = {
+	.ver_major	= VER_2_X_NO_RPM,
+	.crit_int	= 1,
+	.combo_int	= 1,
+	.adc		= 0,
+	.srot_split	= 1,
+	.max_sensors	= 16,
+	.trip_min_temp	= 0,
+	.trip_max_temp	= 204000,
+};
+
 static const struct reg_field tsens_v2_regfields[MAX_REGFIELDS] = {
 	/* ----- SROT ------ */
 	/* VERSION */
···
 	/* CTRL_OFF */
 	[TSENS_EN]     = REG_FIELD(SROT_CTRL_OFF,    0,  0),
 	[TSENS_SW_RST] = REG_FIELD(SROT_CTRL_OFF,    1,  1),
+	[SENSOR_EN]    = REG_FIELD(SROT_CTRL_OFF,    3,  18),
+	[CODE_OR_TEMP] = REG_FIELD(SROT_CTRL_OFF,    21, 21),
+
+	[MAIN_MEASURE_PERIOD] = REG_FIELD(SROT_MEASURE_PERIOD, 0, 7),
 
 	/* ----- TM ------ */
 	/* INTERRUPT ENABLE */
···
 	[TRDY] = REG_FIELD(TM_TRDY_OFF, 0, 0),
 };
 
+static int tsens_v2_calibrate_sensor(struct device *dev, struct tsens_sensor *sensor,
+				     struct regmap *map,  u32 mode, u32 base0, u32 base1)
+{
+	u32	shift = V2_SHIFT_DEFAULT;
+	u32	slope = V2_SLOPE_DEFAULT;
+	u32	czero = V2_CZERO_DEFAULT;
+	char	name[20];
+	u32	val;
+	int	ret;
+
+	/* Read offset value */
+	ret = snprintf(name, sizeof(name), "tsens_sens%d_off", sensor->hw_id);
+	if (ret < 0)
+		return ret;
+
+	ret = nvmem_cell_read_variable_le_u32(dev, name, &sensor->offset);
+	if (ret)
+		return ret;
+
+	/* Based on calib mode, program SHIFT, SLOPE and CZERO */
+	switch (mode) {
+	case TWO_PT_CALIB:
+		slope = (TWO_PT_SHIFTED_GAIN / (base1 - base0));
+
+		czero = (base0 + sensor->offset - ((base1 - base0) / 3));
+
+		break;
+	case ONE_PT_CALIB2:
+		czero = base0 + sensor->offset - ONE_PT_CZERO_CONST;
+
+		slope = ONE_PT_SLOPE;
+
+		break;
+	default:
+		dev_dbg(dev, "calibrationless mode\n");
+	}
+
+	val = FIELD_PREP(CONVERSION_SHIFT_MASK, shift) |
+	      FIELD_PREP(CONVERSION_SLOPE_MASK, slope) |
+	      FIELD_PREP(CONVERSION_CZERO_MASK, czero);
+
+	regmap_write(map, SENSOR_CONVERSION(sensor->hw_id), val);
+
+	return 0;
+}
+
+static int tsens_v2_calibration(struct tsens_priv *priv)
+{
+	struct device *dev = priv->dev;
+	u32 mode, base0, base1;
+	int i, ret;
+
+	if (priv->num_sensors > MAX_SENSORS)
+		return -EINVAL;
+
+	ret = nvmem_cell_read_variable_le_u32(priv->dev, "mode", &mode);
+	if (ret == -ENOENT)
+		dev_warn(priv->dev, "Calibration data not present in DT\n");
+	if (ret < 0)
+		return ret;
+
+	dev_dbg(priv->dev, "calibration mode is %d\n", mode);
+
+	ret = nvmem_cell_read_variable_le_u32(priv->dev, "base0", &base0);
+	if (ret < 0)
+		return ret;
+
+	ret = nvmem_cell_read_variable_le_u32(priv->dev, "base1", &base1);
+	if (ret < 0)
+		return ret;
+
+	/* Calibrate each sensor */
+	for (i = 0; i < priv->num_sensors; i++) {
+		ret = tsens_v2_calibrate_sensor(dev, &priv->sensor[i], priv->srot_map,
+						mode, base0, base1);
+		if (ret < 0)
+			return ret;
+	}
+
+	return 0;
+}
+
+static int __init init_tsens_v2_no_rpm(struct tsens_priv *priv)
+{
+	struct device *dev = priv->dev;
+	int i, ret;
+	u32 val = 0;
+
+	ret = init_common(priv);
+	if (ret < 0)
+		return ret;
+
+	priv->rf[CODE_OR_TEMP] = devm_regmap_field_alloc(dev, priv->srot_map,
+							 priv->fields[CODE_OR_TEMP]);
+	if (IS_ERR(priv->rf[CODE_OR_TEMP]))
+		return PTR_ERR(priv->rf[CODE_OR_TEMP]);
+
+	priv->rf[MAIN_MEASURE_PERIOD] = devm_regmap_field_alloc(dev, priv->srot_map,
+								priv->fields[MAIN_MEASURE_PERIOD]);
+	if (IS_ERR(priv->rf[MAIN_MEASURE_PERIOD]))
+		return PTR_ERR(priv->rf[MAIN_MEASURE_PERIOD]);
+
+	regmap_field_write(priv->rf[TSENS_SW_RST], SW_RST_ASSERT);
+
+	regmap_field_write(priv->rf[MAIN_MEASURE_PERIOD], MEASURE_PERIOD_2mSEC);
+
+	/* Enable available sensors */
+	for (i = 0; i < priv->num_sensors; i++)
+		val |= 1 << priv->sensor[i].hw_id;
+
+	regmap_field_write(priv->rf[SENSOR_EN], val);
+
+	/* Select temperature format, unit is deci-Celsius */
+	regmap_field_write(priv->rf[CODE_OR_TEMP], RESULT_FORMAT_TEMP);
+
+	regmap_field_write(priv->rf[TSENS_SW_RST], SW_RST_DEASSERT);
+
+	regmap_field_write(priv->rf[TSENS_EN], TSENS_ENABLE);
+
+	return 0;
+}
+
 static const struct tsens_ops ops_generic_v2 = {
 	.init		= init_common,
 	.get_temp	= get_temp_tsens_valid,
···
 	.ops		= &ops_generic_v2,
 	.feat		= &ipq8074_feat,
 	.fields	= tsens_v2_regfields,
+};
+
+static const struct tsens_ops ops_ipq5332 = {
+	.init		= init_tsens_v2_no_rpm,
+	.get_temp	= get_temp_tsens_valid,
+	.calibrate	= tsens_v2_calibration,
+};
+
+const struct tsens_plat_data data_ipq5332 = {
+	.num_sensors	= 5,
+	.ops		= &ops_ipq5332,
+	.hw_ids		= (unsigned int []){11, 12, 13, 14, 15},
+	.feat		= &ipq5332_feat,
+	.fields		= tsens_v2_regfields,
+};
+
+const struct tsens_plat_data data_ipq5424 = {
+	.num_sensors	= 7,
+	.ops		= &ops_ipq5332,
+	.hw_ids		= (unsigned int []){9, 10, 11, 12, 13, 14, 15},
+	.feat		= &ipq5332_feat,
+	.fields		= tsens_v2_regfields,
 };
 
 /* Kept around for backward compatibility with old msm8996.dtsi */

drivers/thermal/qcom/tsens.c

···
 	ret = regmap_field_read(priv->rf[TSENS_EN], &enabled);
 	if (ret)
 		goto err_put_device;
-	if (!enabled) {
+	if (!enabled && (tsens_version(priv) != VER_2_X_NO_RPM)) {
 		dev_err(dev, "%s: device not enabled\n", __func__);
 		ret = -ENODEV;
 		goto err_put_device;
···
 
 static const struct of_device_id tsens_table[] = {
 	{
+		.compatible = "qcom,ipq5332-tsens",
+		.data = &data_ipq5332,
+	}, {
+		.compatible = "qcom,ipq5424-tsens",
+		.data = &data_ipq5424,
+	}, {
 		.compatible = "qcom,ipq8064-tsens",
 		.data = &data_8960,
 	}, {

drivers/thermal/qcom/tsens.h

···
 	VER_0_1,
 	VER_1_X,
 	VER_2_X,
+	VER_2_X_NO_RPM,
 };
 
 enum tsens_irq_type {
···
 	TSENS_SW_RST,
 	SENSOR_EN,
 	CODE_OR_TEMP,
+	MAIN_MEASURE_PERIOD,
 
 	/* ----- TM ------ */
 	/* TRDY */
···
 
 /* TSENS v2 targets */
 extern struct tsens_plat_data data_8996, data_ipq8074, data_tsens_v2;
+extern const struct tsens_plat_data data_ipq5332, data_ipq5424;
 
 #endif /* __QCOM_TSENS_H__ */