in imx_thermal.c [647:818]
static int imx_thermal_probe(struct platform_device *pdev)
{
struct imx_thermal_data *data;
struct regmap *map;
int measure_freq;
int ret;
data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
if (!data)
return -ENOMEM;
data->dev = &pdev->dev;
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->socdata = of_device_get_match_data(&pdev->dev);
if (!data->socdata) {
dev_err(&pdev->dev, "no device match found\n");
return -ENODEV;
}
/* make sure the IRQ flag is clear before enabling irq on i.MX6SX */
if (data->socdata->version == TEMPMON_IMX6SX) {
regmap_write(map, IMX6_MISC1 + REG_CLR,
IMX6_MISC1_IRQ_TEMPHIGH | IMX6_MISC1_IRQ_TEMPLOW
| IMX6_MISC1_IRQ_TEMPPANIC);
/*
* reset value of LOW ALARM is incorrect, set it to lowest
* value to avoid false trigger of low alarm.
*/
regmap_write(map, data->socdata->low_alarm_ctrl + REG_SET,
data->socdata->low_alarm_mask);
}
data->irq = platform_get_irq(pdev, 0);
if (data->irq < 0)
return data->irq;
platform_set_drvdata(pdev, data);
if (of_find_property(pdev->dev.of_node, "nvmem-cells", NULL)) {
ret = imx_init_from_nvmem_cells(pdev);
if (ret)
return dev_err_probe(&pdev->dev, ret,
"failed to init from nvmem\n");
} else {
ret = imx_init_from_tempmon_data(pdev);
if (ret) {
dev_err(&pdev->dev, "failed to init from fsl,tempmon-data\n");
return ret;
}
}
/* Make sure sensor is in known good state for measurements */
regmap_write(map, data->socdata->sensor_ctrl + REG_CLR,
data->socdata->power_down_mask);
regmap_write(map, data->socdata->sensor_ctrl + REG_CLR,
data->socdata->measure_temp_mask);
regmap_write(map, data->socdata->measure_freq_ctrl + REG_CLR,
data->socdata->measure_freq_mask);
if (data->socdata->version != TEMPMON_IMX7D)
regmap_write(map, IMX6_MISC0 + REG_SET,
IMX6_MISC0_REFTOP_SELBIASOFF);
regmap_write(map, data->socdata->sensor_ctrl + REG_SET,
data->socdata->power_down_mask);
ret = imx_thermal_register_legacy_cooling(data);
if (ret)
return dev_err_probe(&pdev->dev, ret,
"failed to register cpufreq cooling device\n");
data->thermal_clk = devm_clk_get(&pdev->dev, NULL);
if (IS_ERR(data->thermal_clk)) {
ret = PTR_ERR(data->thermal_clk);
if (ret != -EPROBE_DEFER)
dev_err(&pdev->dev,
"failed to get thermal clk: %d\n", ret);
goto legacy_cleanup;
}
/*
* 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_err(&pdev->dev, "failed to enable thermal clk: %d\n", ret);
goto legacy_cleanup;
}
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);
goto clk_disable;
}
dev_info(&pdev->dev, "%s CPU temperature grade - max:%dC"
" critical:%dC passive:%dC\n", data->temp_grade,
data->temp_max / 1000, data->temp_critical / 1000,
data->temp_passive / 1000);
/* Enable measurements at ~ 10 Hz */
regmap_write(map, data->socdata->measure_freq_ctrl + REG_CLR,
data->socdata->measure_freq_mask);
measure_freq = DIV_ROUND_UP(32768, 10); /* 10 Hz */
regmap_write(map, data->socdata->measure_freq_ctrl + REG_SET,
measure_freq << data->socdata->measure_freq_shift);
imx_set_alarm_temp(data, data->temp_passive);
if (data->socdata->version == TEMPMON_IMX6SX)
imx_set_panic_temp(data, data->temp_critical);
regmap_write(map, data->socdata->sensor_ctrl + REG_CLR,
data->socdata->power_down_mask);
regmap_write(map, data->socdata->sensor_ctrl + REG_SET,
data->socdata->measure_temp_mask);
/* After power up, we need a delay before first access can be done. */
usleep_range(20, 50);
/* the core was configured and enabled just before */
pm_runtime_set_active(&pdev->dev);
pm_runtime_enable(data->dev);
ret = pm_runtime_resume_and_get(data->dev);
if (ret < 0)
goto disable_runtime_pm;
data->irq_enabled = true;
ret = thermal_zone_device_enable(data->tz);
if (ret)
goto thermal_zone_unregister;
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);
goto thermal_zone_unregister;
}
pm_runtime_put(data->dev);
return 0;
thermal_zone_unregister:
thermal_zone_device_unregister(data->tz);
disable_runtime_pm:
pm_runtime_put_noidle(data->dev);
pm_runtime_disable(data->dev);
clk_disable:
clk_disable_unprepare(data->thermal_clk);
legacy_cleanup:
imx_thermal_unregister_legacy_cooling(data);
return ret;
}