The RK3368 SoCs support to 2 channel TS-ADC, the temperature criteria
of each channel can be configurable.
The system has two Temperature Sensors, channel 0 is for CPU,
and channel 1 is for GPU.
Signed-off-by: Caesar Wang <wxt@xxxxxxxxxxxxxx>
---
drivers/thermal/rockchip_thermal.c | 201 ++++++++++++++++++++++++++++++++-----
1 file changed, 176 insertions(+), 25 deletions(-)
diff --git a/drivers/thermal/rockchip_thermal.c b/drivers/thermal/rockchip_thermal.c
index 4d5b7d4..16d2476 100644
--- a/drivers/thermal/rockchip_thermal.c
+++ b/drivers/thermal/rockchip_thermal.c
@@ -1,6 +1,9 @@
/*
* Copyright (c) 2014, Fuzhou Rockchip Electronics Co., Ltd
*
+ * Copyright (c) 2015, Fuzhou Rockchip Electronics Co., Ltd
+ * Caesar Wang <wxt@xxxxxxxxxxxxxx>
+ *
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
@@ -43,16 +46,11 @@ enum tshut_polarity {
TSHUT_HIGH_ACTIVE,
};
-/**
- * The system has three Temperature Sensors. channel 0 is reserved,
- * channel 1 is for CPU, and channel 2 is for GPU.
- */
-enum sensor_id {
- SENSOR_CPU = 1,
- SENSOR_GPU,
-};
-
struct rockchip_tsadc_chip {
+ /* The sensor id of chip correspond to the ADC channel */
+ int cpu_id;
+ int gpu_id;
+
/* The hardware-controlled tshut property */
long tshut_temp;
enum tshut_mode tshut_mode;
@@ -72,10 +70,11 @@ struct rockchip_tsadc_chip {
struct rockchip_thermal_sensor {
struct rockchip_thermal_data *thermal;
struct thermal_zone_device *tzd;
- enum sensor_id id;
+ int id;
};
-#define NUM_SENSORS 2 /* Ignore unused sensor 0 */
+/* Two sensors: CPU and GPU */
+#define NUM_SENSORS 2
struct rockchip_thermal_data {
const struct rockchip_tsadc_chip *chip;
@@ -94,7 +93,7 @@ struct rockchip_thermal_data {
enum tshut_polarity tshut_polarity;
};
-/* TSADC V2 Sensor info define: */
+/* TSADC Sensor info define: */
#define TSADCV2_AUTO_CON 0x04
#define TSADCV2_INT_EN 0x08
#define TSADCV2_INT_PD 0x0c
@@ -116,6 +115,8 @@ struct rockchip_thermal_data {
#define TSADCV2_INT_PD_CLEAR_MASK ~BIT(8)
#define TSADCV2_DATA_MASK 0xfff
+#define TSADCV3_DATA_MASK 0x3ff
+
#define TSADCV2_HIGHT_INT_DEBOUNCE_COUNT 4
#define TSADCV2_HIGHT_TSHUT_DEBOUNCE_COUNT 4
#define TSADCV2_AUTO_PERIOD_TIME 250 /* msec */
@@ -164,6 +165,45 @@ static const struct tsadc_table v2_code_table[] = {
{3421, 125000},
};
+static const struct tsadc_table v3_code_table[] = {
+ {0, -40000},
+ {106, -40000},
+ {108, -35000},
+ {110, -30000},
+ {112, -25000},
+ {114, -20000},
+ {116, -15000},
+ {118, -10000},
+ {120, -5000},
+ {122, 0},
+ {124, 5000},
+ {126, 10000},
+ {128, 15000},
+ {130, 20000},
+ {132, 25000},
+ {134, 30000},
+ {136, 35000},
+ {138, 40000},
+ {140, 45000},
+ {142, 50000},
+ {144, 55000},
+ {146, 60000},
+ {148, 65000},
+ {150, 70000},
+ {152, 75000},
+ {154, 80000},
+ {156, 85000},
+ {158, 90000},
+ {160, 95000},
+ {162, 100000},
+ {163, 105000},
+ {165, 110000},
+ {167, 115000},
+ {169, 120000},
+ {171, 125000},
+ {TSADCV3_DATA_MASK, 125000},
+};
+
static u32 rk_tsadcv2_temp_to_code(long temp)
{
int high, low, mid;
@@ -227,16 +267,83 @@ static int rk_tsadcv2_code_to_temp(u32 code, int *temp)
return 0;
}
+static u32 rk_tsadcv3_temp_to_code(long temp)
+{
+ int high, low, mid;
+
+ low = 0;
+ high = ARRAY_SIZE(v3_code_table) - 1;
+ mid = (high + low) / 2;
+
+ if (temp < v3_code_table[low].temp || temp > v3_code_table[high].temp)
+ return 0;
+
+ while (low <= high) {
+ if (temp == v3_code_table[mid].temp)
+ return v3_code_table[mid].code;
+ else if (temp < v3_code_table[mid].temp)
+ high = mid - 1;
+ else
+ low = mid + 1;
+ mid = (low + high) / 2;
+ }
+
+ return 0;
+}
+
+static int rk_tsadcv3_code_to_temp(u32 code, int *temp)
+{
+ unsigned int low = 1;
+ unsigned int high = ARRAY_SIZE(v3_code_table) - 1;
+ unsigned int mid = (low + high) / 2;
+ unsigned int num;
+ unsigned long denom;
+
+ BUILD_BUG_ON(ARRAY_SIZE(v3_code_table) < 2);
+
+ code &= TSADCV3_DATA_MASK;
+ if (code < v3_code_table[low].code)
+ return -EAGAIN; /* Incorrect reading */
+
+ while (low <= high) {
+ if (code >= v3_code_table[mid - 1].code &&
+ code < v3_code_table[mid].code)
+ break;
+ else if (code > v3_code_table[mid].code)
+ low = mid + 1;
+ else
+ high = mid - 1;
+ mid = (low + high) / 2;
+ }
+
+ /*
+ * The 5C granularity provided by the table is too much. Let's
+ * assume that the relationship between sensor readings and
+ * temperature between 2 table entries is linear and interpolate
+ * to produce less granular result.
+ */
+ num = v3_code_table[mid].temp - v3_code_table[mid - 1].temp;
+ num *= code - v3_code_table[mid - 1].code;
+ denom = v3_code_table[mid].code - v3_code_table[mid - 1].code;
+ *temp = v3_code_table[mid - 1].temp + (num / denom);
+
+ return 0;
+}
+
/**
- * rk_tsadcv2_initialize - initialize TASDC Controller
- * (1) Set TSADCV2_AUTO_PERIOD, configure the interleave between
- * every two accessing of TSADC in normal operation.
- * (2) Set TSADCV2_AUTO_PERIOD_HT, configure the interleave between
- * every two accessing of TSADC after the temperature is higher
- * than COM_SHUT or COM_INT.
- * (3) Set TSADCV2_HIGH_INT_DEBOUNCE and TSADC_HIGHT_TSHUT_DEBOUNCE,
- * if the temperature is higher than COMP_INT or COMP_SHUT for
- * "debounce" times, TSADC controller will generate interrupt or TSHUT.
+ * rk_tsadcv2_initialize - initialize TASDC Controller.
+ *
+ * (1) Set TSADC_V2_AUTO_PERIOD:
+ * Configure the interleave between every two accessing of
+ * TSADC in normal operation.
+ *
+ * (2) Set TSADCV2_AUTO_PERIOD_HT:
+ * Configure the interleave between every two accessing of
+ * TSADC after the temperature is higher than COM_SHUT or COM_INT.
+ *
+ * (3) Set TSADCV2_HIGH_INT_DEBOUNCE and TSADC_HIGHT_TSHUT_DEBOUNCE:
+ * If the temperature is higher than COMP_INT or COMP_SHUT for
+ * "debounce" times, TSADC controller will generate interrupt or TSHUT.
*/
static void rk_tsadcv2_initialize(void __iomem *regs,
enum tshut_polarity tshut_polarity)
@@ -316,7 +423,31 @@ static void rk_tsadcv2_tshut_mode(int chn, void __iomem *regs,
writel_relaxed(val, regs + TSADCV2_INT_EN);
}
+static int rk_tsadcv3_get_temp(int chn, void __iomem *regs, int *temp)
+{
+ u32 val;
+
+ val = readl_relaxed(regs + TSADCV2_DATA(chn));
+
+ return rk_tsadcv3_code_to_temp(val, temp);
+}
+
+static void rk_tsadcv3_tshut_temp(int chn, void __iomem *regs, long temp)
+{
+ u32 tshut_value, val;
+
+ tshut_value = rk_tsadcv3_temp_to_code(temp);
+ writel_relaxed(tshut_value, regs + TSADCV2_COMP_SHUT(chn));
+
+ /* TSHUT will be valid */
+ val = readl_relaxed(regs + TSADCV2_AUTO_CON);
+ writel_relaxed(val | TSADCV2_AUTO_SRC_EN(chn), regs + TSADCV2_AUTO_CON);
+}
+
static const struct rockchip_tsadc_chip rk3288_tsadc_data = {
+ .cpu_id = 1,
+ .gpu_id = 2,
+
.tshut_mode = TSHUT_MODE_GPIO, /* default TSHUT via GPIO give PMIC */
.tshut_polarity = TSHUT_LOW_ACTIVE, /* default TSHUT LOW ACTIVE */
.tshut_temp = 95000,
@@ -329,11 +460,31 @@ static const struct rockchip_tsadc_chip rk3288_tsadc_data = {
.set_tshut_mode = rk_tsadcv2_tshut_mode,
};
+static const struct rockchip_tsadc_chip rk3368_tsadc_data = {
+ .cpu_id = 0,
+ .gpu_id = 1,
+
+ .tshut_mode = TSHUT_MODE_GPIO, /* default TSHUT via GPIO give PMIC */
+ .tshut_polarity = TSHUT_LOW_ACTIVE, /* default TSHUT LOW ACTIVE */
+ .tshut_temp = 95000,
+
+ .initialize = rk_tsadcv2_initialize,
+ .irq_ack = rk_tsadcv2_irq_ack,
+ .control = rk_tsadcv2_control,
+ .get_temp = rk_tsadcv3_get_temp,
+ .set_tshut_temp = rk_tsadcv3_tshut_temp,
+ .set_tshut_mode = rk_tsadcv2_tshut_mode,
+};
+
static const struct of_device_id of_rockchip_thermal_match[] = {
{
.compatible = "rockchip,rk3288-tsadc",
.data = (void *)&rk3288_tsadc_data,
},
+ {
+ .compatible = "rockchip,rk3368-tsadc",
+ .data = (void *)&rk3368_tsadc_data,
+ },
{ /* end */ },
};
MODULE_DEVICE_TABLE(of, of_rockchip_thermal_match);
@@ -441,7 +592,7 @@ static int
rockchip_thermal_register_sensor(struct platform_device *pdev,
struct rockchip_thermal_data *thermal,
struct rockchip_thermal_sensor *sensor,
- enum sensor_id id)
+ int id)
{
const struct rockchip_tsadc_chip *tsadc = thermal->chip;
int error;
@@ -557,7 +708,7 @@ static int rockchip_thermal_probe(struct platform_device *pdev)
error = rockchip_thermal_register_sensor(pdev, thermal,
&thermal->sensors[0],
- SENSOR_CPU);
+ thermal->chip->cpu_id);
if (error) {
dev_err(&pdev->dev,
"failed to register CPU thermal sensor: %d\n", error);
@@ -566,7 +717,7 @@ static int rockchip_thermal_probe(struct platform_device *pdev)
error = rockchip_thermal_register_sensor(pdev, thermal,
&thermal->sensors[1],
- SENSOR_GPU);
+ thermal->chip->gpu_id);
if (error) {
dev_err(&pdev->dev,
"failed to register GPU thermal sensor: %d\n", error);
@@ -661,7 +812,7 @@ static int __maybe_unused rockchip_thermal_resume(struct device *dev)
thermal->chip->initialize(thermal->regs, thermal->tshut_polarity);
for (i = 0; i < ARRAY_SIZE(thermal->sensors); i++) {
- enum sensor_id id = thermal->sensors[i].id;
+ int id = thermal->sensors[i].id;
thermal->chip->set_tshut_mode(id, thermal->regs,
thermal->tshut_mode);
--
1.9.1
--
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