thermal: qcom: tsens-v1: Add support for MSM8956 and MSM8976

Add support for reading calibrated value from thermistors in
MSM8956, MSM8976 and their APQ variants.
Signed-off-by: AngeloGioacchino Del Regno <kholk11@gmail.com>
Reviewed-by: Amit Kucheria <amit.kucheria@linaro.org>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Link: https://lore.kernel.org/r/20191005104133.30297-2-kholk11@gmail.com

drivers/thermal/qcom/tsens-v1.c

@@ -6,6 +6,7 @@
 #include <linux/bitops.h>
 #include <linux/regmap.h>
 #include <linux/delay.h>
+#include <linux/slab.h>
 #include "tsens.h"
 
 /* ----- SROT ------ */
@@ -20,6 +21,68 @@
 #define TM_HIGH_LOW_INT_STATUS_OFF		0x0088
 #define TM_HIGH_LOW_Sn_INT_THRESHOLD_OFF	0x0090
 
+/* eeprom layout data for msm8956/76 (v1) */
+#define MSM8976_BASE0_MASK	0xff
+#define MSM8976_BASE1_MASK	0xff
+#define MSM8976_BASE1_SHIFT	8
+
+#define MSM8976_S0_P1_MASK	0x3f00
+#define MSM8976_S1_P1_MASK	0x3f00000
+#define MSM8976_S2_P1_MASK	0x3f
+#define MSM8976_S3_P1_MASK	0x3f000
+#define MSM8976_S4_P1_MASK	0x3f00
+#define MSM8976_S5_P1_MASK	0x3f00000
+#define MSM8976_S6_P1_MASK	0x3f
+#define MSM8976_S7_P1_MASK	0x3f000
+#define MSM8976_S8_P1_MASK	0x1f8
+#define MSM8976_S9_P1_MASK	0x1f8000
+#define MSM8976_S10_P1_MASK	0xf8000000
+#define MSM8976_S10_P1_MASK_1	0x1
+
+#define MSM8976_S0_P2_MASK	0xfc000
+#define MSM8976_S1_P2_MASK	0xfc000000
+#define MSM8976_S2_P2_MASK	0xfc0
+#define MSM8976_S3_P2_MASK	0xfc0000
+#define MSM8976_S4_P2_MASK	0xfc000
+#define MSM8976_S5_P2_MASK	0xfc000000
+#define MSM8976_S6_P2_MASK	0xfc0
+#define MSM8976_S7_P2_MASK	0xfc0000
+#define MSM8976_S8_P2_MASK	0x7e00
+#define MSM8976_S9_P2_MASK	0x7e00000
+#define MSM8976_S10_P2_MASK	0x7e
+
+#define MSM8976_S0_P1_SHIFT	8
+#define MSM8976_S1_P1_SHIFT	20
+#define MSM8976_S2_P1_SHIFT	0
+#define MSM8976_S3_P1_SHIFT	12
+#define MSM8976_S4_P1_SHIFT	8
+#define MSM8976_S5_P1_SHIFT	20
+#define MSM8976_S6_P1_SHIFT	0
+#define MSM8976_S7_P1_SHIFT	12
+#define MSM8976_S8_P1_SHIFT	3
+#define MSM8976_S9_P1_SHIFT	15
+#define MSM8976_S10_P1_SHIFT	27
+#define MSM8976_S10_P1_SHIFT_1	0
+
+#define MSM8976_S0_P2_SHIFT	14
+#define MSM8976_S1_P2_SHIFT	26
+#define MSM8976_S2_P2_SHIFT	6
+#define MSM8976_S3_P2_SHIFT	18
+#define MSM8976_S4_P2_SHIFT	14
+#define MSM8976_S5_P2_SHIFT	26
+#define MSM8976_S6_P2_SHIFT	6
+#define MSM8976_S7_P2_SHIFT	18
+#define MSM8976_S8_P2_SHIFT	9
+#define MSM8976_S9_P2_SHIFT	21
+#define MSM8976_S10_P2_SHIFT	1
+
+#define MSM8976_CAL_SEL_MASK	0x3
+
+#define MSM8976_CAL_DEGC_PT1	30
+#define MSM8976_CAL_DEGC_PT2	120
+#define MSM8976_SLOPE_FACTOR	1000
+#define MSM8976_SLOPE_DEFAULT	3200
+
 /* eeprom layout data for qcs404/405 (v1) */
 #define BASE0_MASK	0x000007f8
 #define BASE1_MASK	0x0007f800
@@ -79,6 +142,30 @@
 #define CAL_SEL_MASK	7
 #define CAL_SEL_SHIFT	0
 
+static void compute_intercept_slope_8976(struct tsens_priv *priv,
+			      u32 *p1, u32 *p2, u32 mode)
+{
+	int i;
+
+	priv->sensor[0].slope = 3313;
+	priv->sensor[1].slope = 3275;
+	priv->sensor[2].slope = 3320;
+	priv->sensor[3].slope = 3246;
+	priv->sensor[4].slope = 3279;
+	priv->sensor[5].slope = 3257;
+	priv->sensor[6].slope = 3234;
+	priv->sensor[7].slope = 3269;
+	priv->sensor[8].slope = 3255;
+	priv->sensor[9].slope = 3239;
+	priv->sensor[10].slope = 3286;
+
+	for (i = 0; i < priv->num_sensors; i++) {
+		priv->sensor[i].offset = (p1[i] * MSM8976_SLOPE_FACTOR) -
+				(MSM8976_CAL_DEGC_PT1 *
+				priv->sensor[i].slope);
+	}
+}
+
 static int calibrate_v1(struct tsens_priv *priv)
 {
 	u32 base0 = 0, base1 = 0;
@@ -145,7 +232,74 @@ static int calibrate_v1(struct tsens_priv *priv)
 	return 0;
 }
 
-/* v1.x: qcs404,405 */
+static int calibrate_8976(struct tsens_priv *priv)
+{
+	int base0 = 0, base1 = 0, i;
+	u32 p1[11], p2[11];
+	int mode = 0, tmp = 0;
+	u32 *qfprom_cdata;
+
+	qfprom_cdata = (u32 *)qfprom_read(priv->dev, "calib");
+	if (IS_ERR(qfprom_cdata)) {
+		kfree(qfprom_cdata);
+		return PTR_ERR(qfprom_cdata);
+	}
+
+	mode = (qfprom_cdata[4] & MSM8976_CAL_SEL_MASK);
+	dev_dbg(priv->dev, "calibration mode is %d\n", mode);
+
+	switch (mode) {
+	case TWO_PT_CALIB:
+		base1 = (qfprom_cdata[2] & MSM8976_BASE1_MASK) >> MSM8976_BASE1_SHIFT;
+		p2[0] = (qfprom_cdata[0] & MSM8976_S0_P2_MASK) >> MSM8976_S0_P2_SHIFT;
+		p2[1] = (qfprom_cdata[0] & MSM8976_S1_P2_MASK) >> MSM8976_S1_P2_SHIFT;
+		p2[2] = (qfprom_cdata[1] & MSM8976_S2_P2_MASK) >> MSM8976_S2_P2_SHIFT;
+		p2[3] = (qfprom_cdata[1] & MSM8976_S3_P2_MASK) >> MSM8976_S3_P2_SHIFT;
+		p2[4] = (qfprom_cdata[2] & MSM8976_S4_P2_MASK) >> MSM8976_S4_P2_SHIFT;
+		p2[5] = (qfprom_cdata[2] & MSM8976_S5_P2_MASK) >> MSM8976_S5_P2_SHIFT;
+		p2[6] = (qfprom_cdata[3] & MSM8976_S6_P2_MASK) >> MSM8976_S6_P2_SHIFT;
+		p2[7] = (qfprom_cdata[3] & MSM8976_S7_P2_MASK) >> MSM8976_S7_P2_SHIFT;
+		p2[8] = (qfprom_cdata[4] & MSM8976_S8_P2_MASK) >> MSM8976_S8_P2_SHIFT;
+		p2[9] = (qfprom_cdata[4] & MSM8976_S9_P2_MASK) >> MSM8976_S9_P2_SHIFT;
+		p2[10] = (qfprom_cdata[5] & MSM8976_S10_P2_MASK) >> MSM8976_S10_P2_SHIFT;
+
+		for (i = 0; i < priv->num_sensors; i++)
+			p2[i] = ((base1 + p2[i]) << 2);
+		/* Fall through */
+	case ONE_PT_CALIB2:
+		base0 = qfprom_cdata[0] & MSM8976_BASE0_MASK;
+		p1[0] = (qfprom_cdata[0] & MSM8976_S0_P1_MASK) >> MSM8976_S0_P1_SHIFT;
+		p1[1] = (qfprom_cdata[0] & MSM8976_S1_P1_MASK) >> MSM8976_S1_P1_SHIFT;
+		p1[2] = (qfprom_cdata[1] & MSM8976_S2_P1_MASK) >> MSM8976_S2_P1_SHIFT;
+		p1[3] = (qfprom_cdata[1] & MSM8976_S3_P1_MASK) >> MSM8976_S3_P1_SHIFT;
+		p1[4] = (qfprom_cdata[2] & MSM8976_S4_P1_MASK) >> MSM8976_S4_P1_SHIFT;
+		p1[5] = (qfprom_cdata[2] & MSM8976_S5_P1_MASK) >> MSM8976_S5_P1_SHIFT;
+		p1[6] = (qfprom_cdata[3] & MSM8976_S6_P1_MASK) >> MSM8976_S6_P1_SHIFT;
+		p1[7] = (qfprom_cdata[3] & MSM8976_S7_P1_MASK) >> MSM8976_S7_P1_SHIFT;
+		p1[8] = (qfprom_cdata[4] & MSM8976_S8_P1_MASK) >> MSM8976_S8_P1_SHIFT;
+		p1[9] = (qfprom_cdata[4] & MSM8976_S9_P1_MASK) >> MSM8976_S9_P1_SHIFT;
+		p1[10] = (qfprom_cdata[4] & MSM8976_S10_P1_MASK) >> MSM8976_S10_P1_SHIFT;
+		tmp = (qfprom_cdata[5] & MSM8976_S10_P1_MASK_1) << MSM8976_S10_P1_SHIFT_1;
+		p1[10] |= tmp;
+
+		for (i = 0; i < priv->num_sensors; i++)
+			p1[i] = (((base0) + p1[i]) << 2);
+		break;
+	default:
+		for (i = 0; i < priv->num_sensors; i++) {
+			p1[i] = 500;
+			p2[i] = 780;
+		}
+		break;
+	}
+
+	compute_intercept_slope_8976(priv, p1, p2, mode);
+	kfree(qfprom_cdata);
+
+	return 0;
+}
+
+/* v1.x: msm8956,8976,qcs404,405 */
 
 static const struct tsens_features tsens_v1_feat = {
 	.ver_major	= VER_1_X,
@@ -221,3 +375,18 @@ const struct tsens_plat_data data_tsens_v1 = {
 	.feat		= &tsens_v1_feat,
 	.fields	= tsens_v1_regfields,
 };
+
+static const struct tsens_ops ops_8976 = {
+	.init		= init_common,
+	.calibrate	= calibrate_8976,
+	.get_temp	= get_temp_tsens_valid,
+};
+
+/* Valid for both MSM8956 and MSM8976. Sensor ID 3 is unused. */
+const struct tsens_plat_data data_8976 = {
+	.num_sensors	= 11,
+	.ops		= &ops_8976,
+	.hw_ids		= (unsigned int[]){0, 1, 2, 4, 5, 6, 7, 8, 9, 10},
+	.feat		= &tsens_v1_feat,
+	.fields		= tsens_v1_regfields,
+};

drivers/thermal/qcom/tsens.c

@@ -62,6 +62,9 @@ static const struct of_device_id tsens_table[] = {
 	}, {
 		.compatible = "qcom,msm8974-tsens",
 		.data = &data_8974,
+	}, {
+		.compatible = "qcom,msm8976-tsens",
+		.data = &data_8976,
 	}, {
 		.compatible = "qcom,msm8996-tsens",
 		.data = &data_8996,

drivers/thermal/qcom/tsens.h

@@ -508,7 +508,7 @@ extern const struct tsens_plat_data data_8960;
 extern const struct tsens_plat_data data_8916, data_8974;
 
 /* TSENS v1 targets */
-extern const struct tsens_plat_data data_tsens_v1;
+extern const struct tsens_plat_data data_tsens_v1, data_8976;
 
 /* TSENS v2 targets */
 extern const struct tsens_plat_data data_8996, data_tsens_v2;