From cd47d86ab09f1f3ec5c86441d4fe95e0cf597c06 Mon Sep 17 00:00:00 2001
From: Daniel Golle <daniel@makrotopia.org>
Date: Tue, 13 Sep 2022 00:56:24 +0100
Subject: [PATCH] thermal/drivers/mediatek: add support for MT7986 and MT7981

Add support for V3 generation thermal found in MT7986 and MT7981 SoCs.

Signed-off-by: Daniel Golle <daniel@makrotopia.org>
---
 drivers/thermal/mtk_thermal.c | 202 +++++++++++++++++++++++++++++++++-
 1 file changed, 198 insertions(+), 4 deletions(-)

--- a/drivers/thermal/mtk_thermal.c
+++ b/drivers/thermal/mtk_thermal.c
@@ -150,6 +150,21 @@
 #define CALIB_BUF1_VALID_V2(x)		(((x) >> 4) & 0x1)
 #define CALIB_BUF1_O_SLOPE_SIGN_V2(x)	(((x) >> 3) & 0x1)
 
+/*
+ * Layout of the fuses providing the calibration data
+ * These macros could be used for MT7981 and MT7986.
+ */
+#define CALIB_BUF0_ADC_GE_V3(x)		(((x) >> 0) & 0x3ff)
+#define CALIB_BUF0_ADC_OE_V3(x)		(((x) >> 10) & 0x3ff)
+#define CALIB_BUF0_DEGC_CALI_V3(x)	(((x) >> 20) & 0x3f)
+#define CALIB_BUF0_O_SLOPE_V3(x)	(((x) >> 26) & 0x3f)
+#define CALIB_BUF1_VTS_TS1_V3(x)	(((x) >> 0) & 0x1ff)
+#define CALIB_BUF1_VTS_TS2_V3(x)	(((x) >> 21) & 0x1ff)
+#define CALIB_BUF1_VTS_TSABB_V3(x)	(((x) >> 9) & 0x1ff)
+#define CALIB_BUF1_VALID_V3(x)		(((x) >> 18) & 0x1)
+#define CALIB_BUF1_O_SLOPE_SIGN_V3(x)	(((x) >> 19) & 0x1)
+#define CALIB_BUF1_ID_V3(x)		(((x) >> 20) & 0x1)
+
 enum {
 	VTS1,
 	VTS2,
@@ -163,6 +178,7 @@ enum {
 enum mtk_thermal_version {
 	MTK_THERMAL_V1 = 1,
 	MTK_THERMAL_V2,
+	MTK_THERMAL_V3,
 };
 
 /* MT2701 thermal sensors */
@@ -245,6 +261,27 @@ enum mtk_thermal_version {
 /* The calibration coefficient of sensor  */
 #define MT8183_CALIBRATION	153
 
+/* AUXADC channel 11 is used for the temperature sensors */
+#define MT7986_TEMP_AUXADC_CHANNEL	11
+
+/* The total number of temperature sensors in the MT7986 */
+#define MT7986_NUM_SENSORS		1
+
+/* The number of banks in the MT7986 */
+#define MT7986_NUM_ZONES		1
+
+/* The number of sensing points per bank */
+#define MT7986_NUM_SENSORS_PER_ZONE	1
+
+/* MT7986 thermal sensors */
+#define MT7986_TS1	0
+
+/* The number of controller in the MT7986 */
+#define MT7986_NUM_CONTROLLER		1
+
+/* The calibration coefficient of sensor  */
+#define MT7986_CALIBRATION		165
+
 struct mtk_thermal;
 
 struct thermal_bank_cfg {
@@ -279,6 +316,7 @@ struct mtk_thermal {
 
 	struct clk *clk_peri_therm;
 	struct clk *clk_auxadc;
+	struct clk *clk_adc_32k;
 	/* lock: for getting and putting banks */
 	struct mutex lock;
 
@@ -386,6 +424,14 @@ static const int mt7622_mux_values[MT762
 static const int mt7622_vts_index[MT7622_NUM_SENSORS] = { VTS1 };
 static const int mt7622_tc_offset[MT7622_NUM_CONTROLLER] = { 0x0, };
 
+/* MT7986 thermal sensor data */
+static const int mt7986_bank_data[MT7986_NUM_SENSORS] = { MT7986_TS1, };
+static const int mt7986_msr[MT7986_NUM_SENSORS_PER_ZONE] = { TEMP_MSR0, };
+static const int mt7986_adcpnp[MT7986_NUM_SENSORS_PER_ZONE] = {	TEMP_ADCPNP0, };
+static const int mt7986_mux_values[MT7986_NUM_SENSORS] = { 0, };
+static const int mt7986_vts_index[MT7986_NUM_SENSORS] = { VTS1 };
+static const int mt7986_tc_offset[MT7986_NUM_CONTROLLER] = { 0x0, };
+
 /*
  * The MT8173 thermal controller has four banks. Each bank can read up to
  * four temperature sensors simultaneously. The MT8173 has a total of 5
@@ -549,6 +595,30 @@ static const struct mtk_thermal_data mt8
 	.version = MTK_THERMAL_V1,
 };
 
+/*
+ * MT7986 uses AUXADC Channel 11 for raw data access.
+ */
+static const struct mtk_thermal_data mt7986_thermal_data = {
+	.auxadc_channel = MT7986_TEMP_AUXADC_CHANNEL,
+	.num_banks = MT7986_NUM_ZONES,
+	.num_sensors = MT7986_NUM_SENSORS,
+	.vts_index = mt7986_vts_index,
+	.cali_val = MT7986_CALIBRATION,
+	.num_controller = MT7986_NUM_CONTROLLER,
+	.controller_offset = mt7986_tc_offset,
+	.need_switch_bank = true,
+	.bank_data = {
+		{
+			.num_sensors = 1,
+			.sensors = mt7986_bank_data,
+		},
+	},
+	.msr = mt7986_msr,
+	.adcpnp = mt7986_adcpnp,
+	.sensor_mux_values = mt7986_mux_values,
+	.version = MTK_THERMAL_V3,
+};
+
 /**
  * raw_to_mcelsius - convert a raw ADC value to mcelsius
  * @mt:	The thermal controller
@@ -603,6 +673,22 @@ static int raw_to_mcelsius_v2(struct mtk
 	return (format_2 - tmp) * 100;
 }
 
+static int raw_to_mcelsius_v3(struct mtk_thermal *mt, int sensno, s32 raw)
+{
+	s32 tmp;
+
+	if (raw == 0)
+		return 0;
+
+	raw &= 0xfff;
+	tmp = 100000 * 15 / 16 * 10000;
+	tmp /= 4096 - 512 + mt->adc_ge;
+	tmp /= 1490;
+	tmp *= raw - mt->vts[sensno] - 2900;
+
+	return mt->degc_cali * 500 - tmp;
+}
+
 /**
  * mtk_thermal_get_bank - get bank
  * @bank:	The bank
@@ -659,9 +745,12 @@ static int mtk_thermal_bank_temperature(
 		if (mt->conf->version == MTK_THERMAL_V1) {
 			temp = raw_to_mcelsius_v1(
 				mt, conf->bank_data[bank->id].sensors[i], raw);
-		} else {
+		} else if (mt->conf->version == MTK_THERMAL_V2) {
 			temp = raw_to_mcelsius_v2(
 				mt, conf->bank_data[bank->id].sensors[i], raw);
+		} else {
+			temp = raw_to_mcelsius_v3(
+				mt, conf->bank_data[bank->id].sensors[i], raw);
 		}
 
 		/*
@@ -887,6 +976,26 @@ static int mtk_thermal_extract_efuse_v2(
 	return 0;
 }
 
+static int mtk_thermal_extract_efuse_v3(struct mtk_thermal *mt, u32 *buf)
+{
+	if (!CALIB_BUF1_VALID_V3(buf[1]))
+		return -EINVAL;
+
+	mt->adc_oe = CALIB_BUF0_ADC_OE_V3(buf[0]);
+	mt->adc_ge = CALIB_BUF0_ADC_GE_V3(buf[0]);
+	mt->degc_cali = CALIB_BUF0_DEGC_CALI_V3(buf[0]);
+	mt->o_slope = CALIB_BUF0_O_SLOPE_V3(buf[0]);
+	mt->vts[VTS1] = CALIB_BUF1_VTS_TS1_V3(buf[1]);
+	mt->vts[VTS2] = CALIB_BUF1_VTS_TS2_V3(buf[1]);
+	mt->vts[VTSABB] = CALIB_BUF1_VTS_TSABB_V3(buf[1]);
+	mt->o_slope_sign = CALIB_BUF1_O_SLOPE_SIGN_V3(buf[1]);
+
+	if (CALIB_BUF1_ID_V3(buf[1]) == 0)
+		mt->o_slope = 0;
+
+	return 0;
+}
+
 static int mtk_thermal_get_calibration_data(struct device *dev,
 					    struct mtk_thermal *mt)
 {
@@ -897,6 +1006,7 @@ static int mtk_thermal_get_calibration_d
 
 	/* Start with default values */
 	mt->adc_ge = 512;
+	mt->adc_oe = 512;
 	for (i = 0; i < mt->conf->num_sensors; i++)
 		mt->vts[i] = 260;
 	mt->degc_cali = 40;
@@ -924,8 +1034,10 @@ static int mtk_thermal_get_calibration_d
 
 	if (mt->conf->version == MTK_THERMAL_V1)
 		ret = mtk_thermal_extract_efuse_v1(mt, buf);
-	else
+	else if (mt->conf->version == MTK_THERMAL_V2)
 		ret = mtk_thermal_extract_efuse_v2(mt, buf);
+	else
+		ret = mtk_thermal_extract_efuse_v3(mt, buf);
 
 	if (ret) {
 		dev_info(dev, "Device not calibrated, using default calibration values\n");
@@ -956,6 +1068,10 @@ static const struct of_device_id mtk_the
 		.data = (void *)&mt7622_thermal_data,
 	},
 	{
+		.compatible = "mediatek,mt7986-thermal",
+		.data = (void *)&mt7986_thermal_data,
+	},
+	{
 		.compatible = "mediatek,mt8183-thermal",
 		.data = (void *)&mt8183_thermal_data,
 	}, {
@@ -1009,6 +1125,12 @@ static int mtk_thermal_probe(struct plat
 	if (IS_ERR(mt->clk_auxadc))
 		return PTR_ERR(mt->clk_auxadc);
 
+	if (mt->conf->version == MTK_THERMAL_V3) {
+		mt->clk_adc_32k = devm_clk_get(&pdev->dev, "adc_32k");
+		if (IS_ERR(mt->clk_adc_32k))
+			return PTR_ERR(mt->clk_adc_32k);
+	}
+
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	mt->thermal_base = devm_ioremap_resource(&pdev->dev, res);
 	if (IS_ERR(mt->thermal_base))
@@ -1058,10 +1180,18 @@ static int mtk_thermal_probe(struct plat
 	if (ret)
 		return ret;
 
+	if (mt->conf->version == MTK_THERMAL_V3) {
+		ret = clk_prepare_enable(mt->clk_adc_32k);
+		if (ret) {
+			dev_err(&pdev->dev, "Can't enable auxadc 32k clk: %d\n", ret);
+			return ret;
+		}
+	}
+
 	ret = clk_prepare_enable(mt->clk_auxadc);
 	if (ret) {
 		dev_err(&pdev->dev, "Can't enable auxadc clk: %d\n", ret);
-		return ret;
+		goto err_disable_clk_adc_32k;
 	}
 
 	ret = clk_prepare_enable(mt->clk_peri_therm);
@@ -1070,7 +1200,8 @@ static int mtk_thermal_probe(struct plat
 		goto err_disable_clk_auxadc;
 	}
 
-	if (mt->conf->version == MTK_THERMAL_V2) {
+	if (mt->conf->version == MTK_THERMAL_V2 ||
+	    mt->conf->version == MTK_THERMAL_V3) {
 		mtk_thermal_turn_on_buffer(apmixed_base);
 		mtk_thermal_release_periodic_ts(mt, auxadc_base);
 	}
@@ -1099,6 +1230,9 @@ err_disable_clk_peri_therm:
 	clk_disable_unprepare(mt->clk_peri_therm);
 err_disable_clk_auxadc:
 	clk_disable_unprepare(mt->clk_auxadc);
+err_disable_clk_adc_32k:
+	if (mt->conf->version == MTK_THERMAL_V3)
+		clk_disable_unprepare(mt->clk_adc_32k);
 
 	return ret;
 }
@@ -1110,6 +1244,9 @@ static int mtk_thermal_remove(struct pla
 	clk_disable_unprepare(mt->clk_peri_therm);
 	clk_disable_unprepare(mt->clk_auxadc);
 
+	if (mt->conf->version == MTK_THERMAL_V3)
+		clk_disable_unprepare(mt->clk_adc_32k);
+
 	return 0;
 }
 
