thermal: Add Mediatek thermal driver for mt2701.

This patch adds support for mt2701 chip to mtk_thermal,
and integrate both mt8173 and mt2701 on the same driver.
MT8173 has four banks and five sensors, and MT2701 has
only one bank and three sensors.

Signed-off-by: Dawei Chien <dawei.chien@mediatek.com>
Signed-off-by: Zhang Rui <rui.zhang@intel.com>

1 files changed, 152 insertions, 63 deletions

diff --git a/drivers/thermal/mtk_thermal.c b/drivers/thermal/mtk_thermal.c
index 262ab0a2266f..7b233c718e2e 100644
--- a/drivers/thermal/mtk_thermal.c
+++ b/drivers/thermal/mtk_thermal.c
@@ -2,6 +2,7 @@
  * Copyright (c) 2015 MediaTek Inc.
  * Author: Hanyi Wu <hanyi.wu@mediatek.com>
  *         Sascha Hauer <s.hauer@pengutronix.de>
+ *         Dawei Chien <dawei.chien@mediatek.com>
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 as
@@ -21,6 +22,7 @@
 #include <linux/nvmem-consumer.h>
 #include <linux/of.h>
 #include <linux/of_address.h>
+#include <linux/of_device.h>
 #include <linux/platform_device.h>
 #include <linux/slab.h>
 #include <linux/io.h>
@@ -88,6 +90,7 @@
 #define TEMP_ADCVALIDMASK_VALID_HIGH            BIT(5)
 #define TEMP_ADCVALIDMASK_VALID_POS(bit)        (bit)
 
+/* MT8173 thermal sensors */
 #define MT8173_TS1      0
 #define MT8173_TS2      1
 #define MT8173_TS3      2
@@ -106,7 +109,12 @@
 /* The number of sensing points per bank */
 #define MT8173_NUM_SENSORS_PER_ZONE     4
 
-/* Layout of the fuses providing the calibration data */
+/*
+ * Layout of the fuses providing the calibration data
+ * These macros could be used for both MT8173 and MT2701.
+ * MT8173 has five sensors and need five VTS calibration data,
+ * and MT2701 has three sensors and need three VTS calibration data.
+ */
 #define MT8173_CALIB_BUF0_VALID         BIT(0)
 #define MT8173_CALIB_BUF1_ADC_GE(x)     (((x) >> 22) & 0x3ff)
 #define MT8173_CALIB_BUF0_VTS_TS1(x)    (((x) >> 17) & 0x1ff)
@@ -117,24 +125,50 @@
 #define MT8173_CALIB_BUF0_DEGC_CALI(x)  (((x) >> 1) & 0x3f)
 #define MT8173_CALIB_BUF0_O_SLOPE(x)    (((x) >> 26) & 0x3f)
 
+/* MT2701 thermal sensors */
+#define MT2701_TS1      0
+#define MT2701_TS2      1
+#define MT2701_TSABB    2
+
+/* AUXADC channel 11 is used for the temperature sensors */
+#define MT2701_TEMP_AUXADC_CHANNEL      11
+
+/* The total number of temperature sensors in the MT2701 */
+#define MT2701_NUM_SENSORS      3
+
 #define THERMAL_NAME    "mtk-thermal"
 
+/* The number of sensing points per bank */
+#define MT2701_NUM_SENSORS_PER_ZONE     3
+
 struct mtk_thermal;
 
+struct thermal_bank_cfg {
+        unsigned int num_sensors;
+        const int *sensors;
+};
+
 struct mtk_thermal_bank {
         struct mtk_thermal *mt;
         int id;
 };
 
+struct mtk_thermal_data {
+        s32 num_banks;
+        s32 num_sensors;
+        s32 auxadc_channel;
+        const int *sensor_mux_values;
+        const int *msr;
+        const int *adcpnp;
+        struct thermal_bank_cfg bank_data[];
+};
+
 struct mtk_thermal {
         struct device *dev;
         void __iomem *thermal_base;
 
         struct clk *clk_peri_therm;
         struct clk *clk_auxadc;
-
-        struct mtk_thermal_bank banks[MT8173_NUM_ZONES];
-
         /* lock: for getting and putting banks */
         struct mutex lock;
 
@@ -144,16 +178,44 @@ struct mtk_thermal {
         s32 o_slope;
         s32 vts[MT8173_NUM_SENSORS];
 
+        const struct mtk_thermal_data *conf;
+        struct mtk_thermal_bank banks[];
 };
 
-struct mtk_thermal_bank_cfg {
-        unsigned int num_sensors;
-        unsigned int sensors[MT8173_NUM_SENSORS_PER_ZONE];
+/* MT8173 thermal sensor data */
+const int mt8173_bank_data[MT8173_NUM_ZONES][3] = {
+        { MT8173_TS2, MT8173_TS3 },
+        { MT8173_TS2, MT8173_TS4 },
+        { MT8173_TS1, MT8173_TS2, MT8173_TSABB },
+        { MT8173_TS2 },
 };
 
-static const int sensor_mux_values[MT8173_NUM_SENSORS] = { 0, 1, 2, 3, 16 };
+const int mt8173_msr[MT8173_NUM_SENSORS_PER_ZONE] = {
+        TEMP_MSR0, TEMP_MSR1, TEMP_MSR2, TEMP_MSR2
+};
 
-/*
+const int mt8173_adcpnp[MT8173_NUM_SENSORS_PER_ZONE] = {
+        TEMP_ADCPNP0, TEMP_ADCPNP1, TEMP_ADCPNP2, TEMP_ADCPNP3
+};
+
+const int mt8173_mux_values[MT8173_NUM_SENSORS] = { 0, 1, 2, 3, 16 };
+
+/* MT2701 thermal sensor data */
+const int mt2701_bank_data[MT2701_NUM_SENSORS] = {
+        MT2701_TS1, MT2701_TS2, MT2701_TSABB
+};
+
+const int mt2701_msr[MT2701_NUM_SENSORS_PER_ZONE] = {
+        TEMP_MSR0, TEMP_MSR1, TEMP_MSR2
+};
+
+const int mt2701_adcpnp[MT2701_NUM_SENSORS_PER_ZONE] = {
+        TEMP_ADCPNP0, TEMP_ADCPNP1, TEMP_ADCPNP2
+};
+
+const int mt2701_mux_values[MT2701_NUM_SENSORS] = { 0, 1, 16 };
+
+/**
  * The MT8173 thermal controller has four banks. Each bank can read up to
  * four temperature sensors simultaneously. The MT8173 has a total of 5
  * temperature sensors. We use each bank to measure a certain area of the
@@ -166,42 +228,53 @@ static const int sensor_mux_values[MT8173_NUM_SENSORS] = { 0, 1, 2, 3, 16 };
  * data, and this indeed needs the temperatures of the individual banks
  * for making better decisions.
  */
-static const struct mtk_thermal_bank_cfg bank_data[] = {
-        {
-                .num_sensors = 2,
-                .sensors = { MT8173_TS2, MT8173_TS3 },
-        }, {
-                .num_sensors = 2,
-                .sensors = { MT8173_TS2, MT8173_TS4 },
-        }, {
-                .num_sensors = 3,
-                .sensors = { MT8173_TS1, MT8173_TS2, MT8173_TSABB },
-        }, {
-                .num_sensors = 1,
-                .sensors = { MT8173_TS2 },
+static const struct mtk_thermal_data mt8173_thermal_data = {
+        .auxadc_channel = MT8173_TEMP_AUXADC_CHANNEL,
+        .num_banks = MT8173_NUM_ZONES,
+        .num_sensors = MT8173_NUM_SENSORS,
+        .bank_data = {
+                {
+                        .num_sensors = 2,
+                        .sensors = mt8173_bank_data[0],
+                }, {
+                        .num_sensors = 2,
+                        .sensors = mt8173_bank_data[1],
+                }, {
+                        .num_sensors = 3,
+                        .sensors = mt8173_bank_data[2],
+                }, {
+                        .num_sensors = 1,
+                        .sensors = mt8173_bank_data[3],
+                },
         },
+        .msr = mt8173_msr,
+        .adcpnp = mt8173_adcpnp,
+        .sensor_mux_values = mt8173_mux_values,
 };
 
-struct mtk_thermal_sense_point {
-        int msr;
-        int adcpnp;
-};
-
-static const struct mtk_thermal_sense_point
-                sensing_points[MT8173_NUM_SENSORS_PER_ZONE] = {
-        {
-                .msr = TEMP_MSR0,
-                .adcpnp = TEMP_ADCPNP0,
-        }, {
-                .msr = TEMP_MSR1,
-                .adcpnp = TEMP_ADCPNP1,
-        }, {
-                .msr = TEMP_MSR2,
-                .adcpnp = TEMP_ADCPNP2,
-        }, {
-                .msr = TEMP_MSR3,
-                .adcpnp = TEMP_ADCPNP3,
+/**
+ * The MT2701 thermal controller has one bank, which can read up to
+ * three temperature sensors simultaneously. The MT2701 has a total of 3
+ * temperature sensors.
+ *
+ * The thermal core only gets the maximum temperature of this one bank,
+ * so the bank concept wouldn't be necessary here. However, the SVS (Smart
+ * Voltage Scaling) unit makes its decisions based on the same bank
+ * data.
+ */
+static const struct mtk_thermal_data mt2701_thermal_data = {
+        .auxadc_channel = MT2701_TEMP_AUXADC_CHANNEL,
+        .num_banks = 1,
+        .num_sensors = MT2701_NUM_SENSORS,
+        .bank_data = {
+                {
+                        .num_sensors = 3,
+                        .sensors = mt2701_bank_data,
+                },
         },
+        .msr = mt2701_msr,
+        .adcpnp = mt2701_adcpnp,
+        .sensor_mux_values = mt2701_mux_values,
 };
 
 /**
@@ -270,13 +343,16 @@ static void mtk_thermal_put_bank(struct mtk_thermal_bank *bank)
 static int mtk_thermal_bank_temperature(struct mtk_thermal_bank *bank)
 {
         struct mtk_thermal *mt = bank->mt;
+        const struct mtk_thermal_data *conf = mt->conf;
         int i, temp = INT_MIN, max = INT_MIN;
         u32 raw;
 
-        for (i = 0; i < bank_data[bank->id].num_sensors; i++) {
-                raw = readl(mt->thermal_base + sensing_points[i].msr);
+        for (i = 0; i < conf->bank_data[bank->id].num_sensors; i++) {
+                raw = readl(mt->thermal_base + conf->msr[i]);
 
-                temp = raw_to_mcelsius(mt, bank_data[bank->id].sensors[i], raw);
+                temp = raw_to_mcelsius(mt,
+                                       conf->bank_data[bank->id].sensors[i],
+                                       raw);
 
                 /*
                  * The first read of a sensor often contains very high bogus
@@ -299,7 +375,7 @@ static int mtk_read_temp(void *data, int *temperature)
         int i;
         int tempmax = INT_MIN;
 
-        for (i = 0; i < MT8173_NUM_ZONES; i++) {
+        for (i = 0; i < mt->conf->num_banks; i++) {
                 struct mtk_thermal_bank *bank = &mt->banks[i];
 
                 mtk_thermal_get_bank(bank);
@@ -322,7 +398,7 @@ static void mtk_thermal_init_bank(struct mtk_thermal *mt, int num,
                                   u32 apmixed_phys_base, u32 auxadc_phys_base)
 {
         struct mtk_thermal_bank *bank = &mt->banks[num];
-        const struct mtk_thermal_bank_cfg *cfg = &bank_data[num];
+        const struct mtk_thermal_data *conf = mt->conf;
         int i;
 
         bank->id = num;
@@ -368,7 +444,7 @@ static void mtk_thermal_init_bank(struct mtk_thermal *mt, int num,
          * this value will be stored to TEMP_PNPMUXADDR (TEMP_SPARE0)
          * automatically by hw
          */
-        writel(BIT(MT8173_TEMP_AUXADC_CHANNEL), mt->thermal_base + TEMP_ADCMUX);
+        writel(BIT(conf->auxadc_channel), mt->thermal_base + TEMP_ADCMUX);
 
         /* AHB address for auxadc mux selection */
         writel(auxadc_phys_base + AUXADC_CON1_CLR_V,
@@ -379,18 +455,18 @@ static void mtk_thermal_init_bank(struct mtk_thermal *mt, int num,
                mt->thermal_base + TEMP_PNPMUXADDR);
 
         /* AHB value for auxadc enable */
-        writel(BIT(MT8173_TEMP_AUXADC_CHANNEL), mt->thermal_base + TEMP_ADCEN);
+        writel(BIT(conf->auxadc_channel), mt->thermal_base + TEMP_ADCEN);
 
         /* AHB address for auxadc enable (channel 0 immediate mode selected) */
         writel(auxadc_phys_base + AUXADC_CON1_SET_V,
                mt->thermal_base + TEMP_ADCENADDR);
 
         /* AHB address for auxadc valid bit */
-        writel(auxadc_phys_base + AUXADC_DATA(MT8173_TEMP_AUXADC_CHANNEL),
+        writel(auxadc_phys_base + AUXADC_DATA(conf->auxadc_channel),
                mt->thermal_base + TEMP_ADCVALIDADDR);
 
         /* AHB address for auxadc voltage output */
-        writel(auxadc_phys_base + AUXADC_DATA(MT8173_TEMP_AUXADC_CHANNEL),
+        writel(auxadc_phys_base + AUXADC_DATA(conf->auxadc_channel),
                mt->thermal_base + TEMP_ADCVOLTADDR);
 
         /* read valid & voltage are at the same register */
@@ -407,11 +483,12 @@ static void mtk_thermal_init_bank(struct mtk_thermal *mt, int num,
         writel(TEMP_ADCWRITECTRL_ADC_MUX_WRITE,
                mt->thermal_base + TEMP_ADCWRITECTRL);
 
-        for (i = 0; i < cfg->num_sensors; i++)
-                writel(sensor_mux_values[cfg->sensors[i]],
-                       mt->thermal_base + sensing_points[i].adcpnp);
+        for (i = 0; i < conf->bank_data[num].num_sensors; i++)
+                writel(conf->sensor_mux_values[conf->bank_data[num].sensors[i]],
+                       mt->thermal_base + conf->adcpnp[i]);
 
-        writel((1 << cfg->num_sensors) - 1, mt->thermal_base + TEMP_MONCTL0);
+        writel((1 << conf->bank_data[num].num_sensors) - 1,
+               mt->thermal_base + TEMP_MONCTL0);
 
         writel(TEMP_ADCWRITECTRL_ADC_PNP_WRITE |
                TEMP_ADCWRITECTRL_ADC_MUX_WRITE,
@@ -442,7 +519,7 @@ static int mtk_thermal_get_calibration_data(struct device *dev,
 
         /* Start with default values */
         mt->adc_ge = 512;
-        for (i = 0; i < MT8173_NUM_SENSORS; i++)
+        for (i = 0; i < mt->conf->num_sensors; i++)
                 mt->vts[i] = 260;
         mt->degc_cali = 40;
         mt->o_slope = 0;
@@ -486,18 +563,36 @@ out:
         return ret;
 }
 
+static const struct of_device_id mtk_thermal_of_match[] = {
+        {
+                .compatible = "mediatek,mt8173-thermal",
+                .data = (void *)&mt8173_thermal_data,
+        },
+        {
+                .compatible = "mediatek,mt2701-thermal",
+                .data = (void *)&mt2701_thermal_data,
+        }, {
+        },
+};
+MODULE_DEVICE_TABLE(of, mtk_thermal_of_match);
+
 static int mtk_thermal_probe(struct platform_device *pdev)
 {
         int ret, i;
         struct device_node *auxadc, *apmixedsys, *np = pdev->dev.of_node;
         struct mtk_thermal *mt;
         struct resource *res;
+        const struct of_device_id *of_id;
         u64 auxadc_phys_base, apmixed_phys_base;
 
         mt = devm_kzalloc(&pdev->dev, sizeof(*mt), GFP_KERNEL);
         if (!mt)
                 return -ENOMEM;
 
+        of_id = of_match_device(mtk_thermal_of_match, &pdev->dev);
+        if (of_id)
+                mt->conf = (const struct mtk_thermal_data *)of_id->data;
+
         mt->clk_peri_therm = devm_clk_get(&pdev->dev, "therm");
         if (IS_ERR(mt->clk_peri_therm))
                 return PTR_ERR(mt->clk_peri_therm);
@@ -565,7 +660,7 @@ static int mtk_thermal_probe(struct platform_device *pdev)
                 goto err_disable_clk_auxadc;
         }
 
-        for (i = 0; i < MT8173_NUM_ZONES; i++)
+        for (i = 0; i < mt->conf->num_banks; i++)
                 mtk_thermal_init_bank(mt, i, apmixed_phys_base,
                                       auxadc_phys_base);
 
@@ -592,13 +687,6 @@ static int mtk_thermal_remove(struct platform_device *pdev)
         return 0;
 }
 
-static const struct of_device_id mtk_thermal_of_match[] = {
-        {
-                .compatible = "mediatek,mt8173-thermal",
-        }, {
-        },
-};
-
 static struct platform_driver mtk_thermal_driver = {
         .probe = mtk_thermal_probe,
         .remove = mtk_thermal_remove,
@@ -610,6 +698,7 @@ static struct platform_driver mtk_thermal_driver = {
 
 module_platform_driver(mtk_thermal_driver);
 
+MODULE_AUTHOR("Dawei Chien <dawei.chien@mediatek.com>");
 MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de>");
 MODULE_AUTHOR("Hanyi Wu <hanyi.wu@mediatek.com>");
 MODULE_DESCRIPTION("Mediatek thermal driver");