thermal: rockchip: add the set_trips function

Whenever the current temperature is updated, the trip points immediately
below and above the current temperature are found. A sensor driver
callback `set_trips' is then called with the temperatures.
Lastly, The sensor will trigger the hardware high temperature interrupts
to increase the sampleing rate and throttle frequency to limit the temperature
rising When performing passive cooling.

Change-Id: I43d37a8431240cb7b62da7bff83464aba3c8983e
Signed-off-by: Caesar Wang <wxt@rock-chips.com>

diff --git a/drivers/thermal/rockchip_thermal.c b/drivers/thermal/rockchip_thermal.c
index c8b57c632a51012222545da6d1aaa3e6be642822..dcd36db4e10419566fbd3172501a35afa6779633 100644 (file)
--- a/drivers/thermal/rockchip_thermal.c
+++ b/drivers/thermal/rockchip_thermal.c
@@ -96,6 +96,7 @@ struct chip_tsadc_table {
  * @initialize: SoC special initialize tsadc controller method
  * @irq_ack: clear the interrupt
  * @get_temp: get the temperature
+ * @set_alarm_temp: set the high temperature interrupt
  * @set_tshut_temp: set the hardware-controlled shutdown temperature
  * @set_tshut_mode: set the hardware-controlled shutdown mode
  * @table: the chip-specific conversion table
@@ -119,6 +120,8 @@ struct rockchip_tsadc_chip {
        /* Per-sensor methods */
        int (*get_temp)(struct chip_tsadc_table table,
                        int chn, void __iomem *reg, int *temp);
+       void (*set_alarm_temp)(struct chip_tsadc_table table,
+                              int chn, void __iomem *reg, int temp);
        void (*set_tshut_temp)(struct chip_tsadc_table table,
                               int chn, void __iomem *reg, int temp);
        void (*set_tshut_mode)(int chn, void __iomem *reg, enum tshut_mode m);
@@ -183,6 +186,7 @@ struct rockchip_thermal_data {
 #define TSADCV2_INT_EN                         0x08
 #define TSADCV2_INT_PD                         0x0c
 #define TSADCV2_DATA(chn)                      (0x20 + (chn) * 0x04)
+#define TSADCV2_COMP_INT(chn)                  (0x30 + (chn) * 0x04)
 #define TSADCV2_COMP_SHUT(chn)                 (0x40 + (chn) * 0x04)
 #define TSADCV2_HIGHT_INT_DEBOUNCE             0x60
 #define TSADCV2_HIGHT_TSHUT_DEBOUNCE           0x64
@@ -628,6 +632,20 @@ static int rk_tsadcv2_get_temp(struct chip_tsadc_table table,
        return rk_tsadcv2_code_to_temp(table, val, temp);
 }
 
+static void rk_tsadcv2_alarm_temp(struct chip_tsadc_table table,
+                                 int chn, void __iomem *regs, int temp)
+{
+       u32 alarm_value, int_en;
+
+       alarm_value = rk_tsadcv2_temp_to_code(table, temp);
+       writel_relaxed(alarm_value & table.data_mask,
+                      regs + TSADCV2_COMP_INT(chn));
+
+       int_en = readl_relaxed(regs + TSADCV2_INT_EN);
+       int_en |= TSADCV2_INT_SRC_EN(chn);
+       writel_relaxed(int_en, regs + TSADCV2_INT_EN);
+}
+
 static void rk_tsadcv2_tshut_temp(struct chip_tsadc_table table,
                                  int chn, void __iomem *regs, int temp)
 {
@@ -670,6 +688,7 @@ static const struct rockchip_tsadc_chip rk3228_tsadc_data = {
        .irq_ack = rk_tsadcv3_irq_ack,
        .control = rk_tsadcv3_control,
        .get_temp = rk_tsadcv2_get_temp,
+       .set_alarm_temp = rk_tsadcv2_alarm_temp,
        .set_tshut_temp = rk_tsadcv2_tshut_temp,
        .set_tshut_mode = rk_tsadcv2_tshut_mode,
 
@@ -694,6 +713,7 @@ static const struct rockchip_tsadc_chip rk3288_tsadc_data = {
        .irq_ack = rk_tsadcv2_irq_ack,
        .control = rk_tsadcv2_control,
        .get_temp = rk_tsadcv2_get_temp,
+       .set_alarm_temp = rk_tsadcv2_alarm_temp,
        .set_tshut_temp = rk_tsadcv2_tshut_temp,
        .set_tshut_mode = rk_tsadcv2_tshut_mode,
 
@@ -718,6 +738,7 @@ static const struct rockchip_tsadc_chip rk3366_tsadc_data = {
        .irq_ack = rk_tsadcv3_irq_ack,
        .control = rk_tsadcv3_control,
        .get_temp = rk_tsadcv2_get_temp,
+       .set_alarm_temp = rk_tsadcv2_alarm_temp,
        .set_tshut_temp = rk_tsadcv2_tshut_temp,
        .set_tshut_mode = rk_tsadcv2_tshut_mode,
 
@@ -742,6 +763,7 @@ static const struct rockchip_tsadc_chip rk3368_tsadc_data = {
        .irq_ack = rk_tsadcv2_irq_ack,
        .control = rk_tsadcv2_control,
        .get_temp = rk_tsadcv2_get_temp,
+       .set_alarm_temp = rk_tsadcv2_alarm_temp,
        .set_tshut_temp = rk_tsadcv2_tshut_temp,
        .set_tshut_mode = rk_tsadcv2_tshut_mode,
 
@@ -766,6 +788,7 @@ static const struct rockchip_tsadc_chip rk3399_tsadc_data = {
        .irq_ack = rk_tsadcv3_irq_ack,
        .control = rk_tsadcv3_control,
        .get_temp = rk_tsadcv2_get_temp,
+       .set_alarm_temp = rk_tsadcv2_alarm_temp,
        .set_tshut_temp = rk_tsadcv2_tshut_temp,
        .set_tshut_mode = rk_tsadcv2_tshut_mode,
 
@@ -826,6 +849,21 @@ static irqreturn_t rockchip_thermal_alarm_irq_thread(int irq, void *dev)
        return IRQ_HANDLED;
 }
 
+static int rockchip_thermal_set_trips(void *_sensor, int low, int high)
+{
+       struct rockchip_thermal_sensor *sensor = _sensor;
+       struct rockchip_thermal_data *thermal = sensor->thermal;
+       const struct rockchip_tsadc_chip *tsadc = thermal->chip;
+
+       dev_dbg(&thermal->pdev->dev, "%s: sensor %d: low: %d, high %d\n",
+               __func__, sensor->id, low, high);
+
+       tsadc->set_alarm_temp(tsadc->table,
+                             sensor->id, thermal->regs, high);
+
+       return 0;
+}
+
 static int rockchip_thermal_get_temp(void *_sensor, int *out_temp)
 {
        struct rockchip_thermal_sensor *sensor = _sensor;
@@ -843,6 +881,7 @@ static int rockchip_thermal_get_temp(void *_sensor, int *out_temp)
 
 static const struct thermal_zone_of_device_ops rockchip_of_thermal_ops = {
        .get_temp = rockchip_thermal_get_temp,
+       .set_trips = rockchip_thermal_set_trips,
 };
 
 static int rockchip_configure_from_dt(struct device *dev,