static int imx_set_trip_temp(struct thermal_zone_device *tz, int trip,
unsigned long temp)
{
struct imx_thermal_data *data = tz->devdata;
if (trip == IMX_TRIP_CRITICAL)
return -EPERM;
if (temp > IMX_TEMP_PASSIVE)
return -EINVAL;
data->temp_passive = temp;
imx_set_alarm_temp(data, temp);
return 0;
}
static int imx_get_temp(struct thermal_zone_device *tz, unsigned long *temp)
{
struct imx_thermal_data *data = tz->devdata;
struct regmap *map = data->tempmon;
unsigned int n_meas;
bool wait;
u32 val;
if (data->mode == THERMAL_DEVICE_ENABLED) {
/* Check if a measurement is currently in progress */
regmap_read(map, TEMPSENSE0, &val);
wait = !(val & TEMPSENSE0_FINISHED);
} else {
/*
* Every time we measure the temperature, we will power on the
* temperature sensor, enable measurements, take a reading,
* disable measurements, power off the temperature sensor.
*/
regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_POWER_DOWN);
regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_MEASURE_TEMP);
wait = true;
}
/*
* According to the temp sensor designers, it may require up to ~17us
* to complete a measurement.
*/
if (wait)
usleep_range(20, 50);
regmap_read(map, TEMPSENSE0, &val);
if (data->mode != THERMAL_DEVICE_ENABLED) {
regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_MEASURE_TEMP);
regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_POWER_DOWN);
}
if ((val & TEMPSENSE0_FINISHED) == 0) {
dev_dbg(&tz->device, "temp measurement never finished\n");
return -EAGAIN;
}
n_meas = (val & TEMPSENSE0_TEMP_CNT_MASK) >> TEMPSENSE0_TEMP_CNT_SHIFT;
/* See imx_get_sensor_data() for formula derivation */
*temp = data->c2 + data->c1 * n_meas;
/* Update alarm value to next higher trip point */
if (data->alarm_temp == data->temp_passive && *temp >= data->temp_passive)
imx_set_alarm_temp(data, data->temp_critical);
if (data->alarm_temp == data->temp_critical && *temp < data->temp_passive) {
imx_set_alarm_temp(data, data->temp_passive);
dev_dbg(&tz->device, "thermal alarm off: T < %lu\n",
data->alarm_temp / 1000);
}
if (*temp != data->last_temp) {
dev_dbg(&tz->device, "millicelsius: %ld\n", *temp);
data->last_temp = *temp;
}
/* Reenable alarm IRQ if temperature below alarm temperature */
if (!data->irq_enabled && *temp < data->alarm_temp) {
data->irq_enabled = true;
enable_irq(data->irq);
}
return 0;
}
static int imx_thermal_probe(struct platform_device *pdev)
{
struct imx_thermal_data *data;
struct cpumask clip_cpus;
struct regmap *map;
int measure_freq;
int ret;
data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
if (!data)
return -ENOMEM;
map = syscon_regmap_lookup_by_phandle(pdev->dev.of_node, "fsl,tempmon");
if (IS_ERR(map)) {
ret = PTR_ERR(map);
dev_err(&pdev->dev, "failed to get tempmon regmap: %d\n", ret);
return ret;
}
data->tempmon = map;
data->irq = platform_get_irq(pdev, 0);
if (data->irq < 0)
return data->irq;
ret = devm_request_threaded_irq(&pdev->dev, data->irq,
imx_thermal_alarm_irq, imx_thermal_alarm_irq_thread,
0, "imx_thermal", data);
if (ret < 0) {
dev_err(&pdev->dev, "failed to request alarm irq: %d\n", ret);
return ret;
}
platform_set_drvdata(pdev, data);
ret = imx_get_sensor_data(pdev);
if (ret) {
dev_err(&pdev->dev, "failed to get sensor data\n");
return ret;
}
/* Make sure sensor is in known good state for measurements */
regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_POWER_DOWN);
regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_MEASURE_TEMP);
regmap_write(map, TEMPSENSE1 + REG_CLR, TEMPSENSE1_MEASURE_FREQ);
regmap_write(map, MISC0 + REG_SET, MISC0_REFTOP_SELBIASOFF);
regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_POWER_DOWN);
cpumask_set_cpu(0, &clip_cpus);
data->cdev = cpufreq_cooling_register(&clip_cpus);
if (IS_ERR(data->cdev)) {
ret = PTR_ERR(data->cdev);
dev_err(&pdev->dev,
"failed to register cpufreq cooling device: %d\n", ret);
return ret;
}
data->tz = thermal_zone_device_register("imx_thermal_zone",
IMX_TRIP_NUM,
BIT(IMX_TRIP_PASSIVE), data,
&imx_tz_ops, NULL,
IMX_PASSIVE_DELAY,
IMX_POLLING_DELAY);
if (IS_ERR(data->tz)) {
ret = PTR_ERR(data->tz);
dev_err(&pdev->dev,
"failed to register thermal zone device %d\n", ret);
cpufreq_cooling_unregister(data->cdev);
return ret;
}
/* Enable measurements at ~ 10 Hz */
regmap_write(map, TEMPSENSE1 + REG_CLR, TEMPSENSE1_MEASURE_FREQ);
measure_freq = DIV_ROUND_UP(32768, 10); /* 10 Hz */
regmap_write(map, TEMPSENSE1 + REG_SET, measure_freq);
imx_set_alarm_temp(data, data->temp_passive);
regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_POWER_DOWN);
regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_MEASURE_TEMP);
data->irq_enabled = true;
data->mode = THERMAL_DEVICE_ENABLED;
return 0;
}
static int imx_thermal_probe(struct platform_device *pdev)
{
struct imx_thermal_data *data;
struct cpumask clip_cpus;
struct regmap *map;
int measure_freq;
int ret;
data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
if (!data)
return -ENOMEM;
map = syscon_regmap_lookup_by_phandle(pdev->dev.of_node, "fsl,tempmon");
if (IS_ERR(map)) {
ret = PTR_ERR(map);
dev_err(&pdev->dev, "failed to get tempmon regmap: %d\n", ret);
return ret;
}
data->tempmon = map;
data->irq = platform_get_irq(pdev, 0);
if (data->irq < 0)
return data->irq;
ret = devm_request_threaded_irq(&pdev->dev, data->irq,
imx_thermal_alarm_irq, imx_thermal_alarm_irq_thread,
0, "imx_thermal", data);
if (ret < 0) {
dev_err(&pdev->dev, "failed to request alarm irq: %d\n", ret);
return ret;
}
platform_set_drvdata(pdev, data);
ret = imx_get_sensor_data(pdev);
if (ret) {
dev_err(&pdev->dev, "failed to get sensor data\n");
return ret;
}
/* Make sure sensor is in known good state for measurements */
regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_POWER_DOWN);
regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_MEASURE_TEMP);
regmap_write(map, TEMPSENSE1 + REG_CLR, TEMPSENSE1_MEASURE_FREQ);
regmap_write(map, MISC0 + REG_SET, MISC0_REFTOP_SELBIASOFF);
regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_POWER_DOWN);
cpumask_set_cpu(0, &clip_cpus);
data->cdev = cpufreq_cooling_register(&clip_cpus);
if (IS_ERR(data->cdev)) {
ret = PTR_ERR(data->cdev);
dev_err(&pdev->dev,
"failed to register cpufreq cooling device: %d\n", ret);
return ret;
}
data->tz = thermal_zone_device_register("imx_thermal_zone",
IMX_TRIP_NUM,
BIT(IMX_TRIP_PASSIVE), data,
&imx_tz_ops, NULL,
IMX_PASSIVE_DELAY,
IMX_POLLING_DELAY);
if (IS_ERR(data->tz)) {
ret = PTR_ERR(data->tz);
dev_err(&pdev->dev,
"failed to register thermal zone device %d\n", ret);
cpufreq_cooling_unregister(data->cdev);
return ret;
}
data->thermal_clk = devm_clk_get(&pdev->dev, NULL);
if (IS_ERR(data->thermal_clk)) {
dev_warn(&pdev->dev, "failed to get thermal clk!\n");
} else {
/*
* Thermal sensor needs clk on to get correct value, normally
* we should enable its clk before taking measurement and disable
* clk after measurement is done, but if alarm function is enabled,
* hardware will auto measure the temperature periodically, so we
* need to keep the clk always on for alarm function.
*/
ret = clk_prepare_enable(data->thermal_clk);
if (ret)
dev_warn(&pdev->dev, "failed to enable thermal clk: %d\n", ret);
}
/* Enable measurements at ~ 10 Hz */
regmap_write(map, TEMPSENSE1 + REG_CLR, TEMPSENSE1_MEASURE_FREQ);
measure_freq = DIV_ROUND_UP(32768, 10); /* 10 Hz */
regmap_write(map, TEMPSENSE1 + REG_SET, measure_freq);
imx_set_alarm_temp(data, data->temp_passive);
regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_POWER_DOWN);
regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_MEASURE_TEMP);
data->irq_enabled = true;
data->mode = THERMAL_DEVICE_ENABLED;
return 0;
}
