SoCs without RPM have to enable sensors and calibrate from the kernel.
Though TSENS IP supports 16 sensors, not all are used. So used hw_id
to enable the relevant sensors.
Added new calibration function for V2 as the tsens.c calib function
only supports V1.
Signed-off-by: Praveenkumar I <quic_ipkumar@xxxxxxxxxxx>
---
[v5]:
Added bitfield.h to fix build error reported by kernel test robot.
error: implicit declaration of function 'FIELD_PREP' is invalid in C99
[v4]:
Named the values used inside the init_tsens_v2_no_rpm(), used
FIELD_PREP() to get the Sn_CONVERSION data and some minor
changes in the function variable order and array size.
[v3]:
Renamed the init function and removed version check in it.
Corrected the if check in init_common() at tsens.c
[v2]:
Added separate init function for tsens v2 which calls init_common
and initialize the remaining fields. Reformatted calibrate function
and used hw_ids for sensors to enable.
drivers/thermal/qcom/tsens-v2.c | 149 ++++++++++++++++++++++++++++++++
drivers/thermal/qcom/tsens.c | 2 +-
drivers/thermal/qcom/tsens.h | 3 +
3 files changed, 153 insertions(+), 1 deletion(-)
diff --git a/drivers/thermal/qcom/tsens-v2.c b/drivers/thermal/qcom/tsens-v2.c
index 29a61d2d6ca3..7190e477b173 100644
--- a/drivers/thermal/qcom/tsens-v2.c
+++ b/drivers/thermal/qcom/tsens-v2.c
@@ -4,13 +4,32 @@
* Copyright (c) 2018, Linaro Limited
*/
+#include <linux/bitfield.h>
#include <linux/bitops.h>
#include <linux/regmap.h>
+#include <linux/nvmem-consumer.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 RSEULT_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
@@ -59,6 +78,11 @@ static const struct reg_field tsens_v2_regfields[MAX_REGFIELDS] = {
/* 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 */
+ [MAIN_MEASURE_PERIOD] = REG_FIELD(SROT_MEASURE_PERIOD, 0, 7),
/* ----- TM ------ */
/* INTERRUPT ENABLE */
@@ -104,6 +128,131 @@ static const struct reg_field tsens_v2_regfields[MAX_REGFIELDS] = {
[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 slope, czero, val;
+ char name[8];
+ int ret;
+
+ /* Read offset value */
+ ret = snprintf(name, sizeof(name), "s%d", 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));
+
+ val = FIELD_PREP(CONVERSION_SHIFT_MASK, V2_SHIFT_DEFAULT) |
+ FIELD_PREP(CONVERSION_SLOPE_MASK, slope) |
+ FIELD_PREP(CONVERSION_CZERO_MASK, czero);
+
+ fallthrough;
+ case ONE_PT_CALIB2:
+ czero = base0 + sensor->offset - ONE_PT_CZERO_CONST;
+
+ val = FIELD_PREP(CONVERSION_SHIFT_MASK, V2_SHIFT_DEFAULT) |
+ FIELD_PREP(CONVERSION_SLOPE_MASK, ONE_PT_SLOPE) |
+ FIELD_PREP(CONVERSION_CZERO_MASK, czero);
+
+ break;
+ default:
+ dev_dbg(dev, "calibrationless mode\n");
+
+ val = FIELD_PREP(CONVERSION_SHIFT_MASK, V2_SHIFT_DEFAULT) |
+ FIELD_PREP(CONVERSION_SLOPE_MASK, V2_SLOPE_DEFAULT) |
+ FIELD_PREP(CONVERSION_CZERO_MASK, V2_CZERO_DEFAULT);
+ }
+
+ 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], RSEULT_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,
diff --git a/drivers/thermal/qcom/tsens.c b/drivers/thermal/qcom/tsens.c
index 98c356acfe98..9dc0c2150948 100644
--- a/drivers/thermal/qcom/tsens.c
+++ b/drivers/thermal/qcom/tsens.c
@@ -974,7 +974,7 @@ int __init init_common(struct tsens_priv *priv)
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;
diff --git a/drivers/thermal/qcom/tsens.h b/drivers/thermal/qcom/tsens.h
index 2805de1c6827..b2e8f0f2b466 100644
--- a/drivers/thermal/qcom/tsens.h
+++ b/drivers/thermal/qcom/tsens.h
@@ -35,6 +35,7 @@ enum tsens_ver {
VER_0_1,
VER_1_X,
VER_2_X,
+ VER_2_X_NO_RPM,
};
enum tsens_irq_type {
@@ -168,6 +169,8 @@ enum regfield_ids {
TSENS_SW_RST,
SENSOR_EN,
CODE_OR_TEMP,
+ /* MEASURE_PERIOD */
+ MAIN_MEASURE_PERIOD,
/* ----- TM ------ */
/* TRDY */
--
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