diff options
Diffstat (limited to 'drivers/thermal/hisi_thermal.c')
| -rw-r--r-- | drivers/thermal/hisi_thermal.c | 421 |
1 files changed, 421 insertions, 0 deletions
diff --git a/drivers/thermal/hisi_thermal.c b/drivers/thermal/hisi_thermal.c new file mode 100644 index 0000000..d5dd357 --- /dev/null +++ b/drivers/thermal/hisi_thermal.c @@ -0,0 +1,421 @@ +/* + * Hisilicon thermal sensor driver + * + * Copyright (c) 2014-2015 Hisilicon Limited. + * Copyright (c) 2014-2015 Linaro Limited. + * + * Xinwei Kong <kong.kongxinwei@hisilicon.com> + * Leo Yan <leo.yan@linaro.org> + * + * 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 + * published by the Free Software Foundation. + * + * This program is distributed "as is" WITHOUT ANY WARRANTY of any + * kind, whether express or implied; without even the implied warranty + * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#include <linux/cpufreq.h> +#include <linux/delay.h> +#include <linux/interrupt.h> +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/io.h> + +#include "thermal_core.h" + +#define TEMP0_TH (0x4) +#define TEMP0_RST_TH (0x8) +#define TEMP0_CFG (0xC) +#define TEMP0_EN (0x10) +#define TEMP0_INT_EN (0x14) +#define TEMP0_INT_CLR (0x18) +#define TEMP0_RST_MSK (0x1C) +#define TEMP0_VALUE (0x28) + +#define HISI_TEMP_BASE (-60) +#define HISI_TEMP_RESET (100000) + +#define HISI_MAX_SENSORS 4 + +struct hisi_thermal_sensor { + struct hisi_thermal_data *thermal; + struct thermal_zone_device *tzd; + + long sensor_temp; + uint32_t id; + uint32_t thres_temp; +}; + +struct hisi_thermal_data { + struct mutex thermal_lock; /* protects register data */ + struct platform_device *pdev; + struct clk *clk; + struct hisi_thermal_sensor sensors[HISI_MAX_SENSORS]; + + int irq, irq_bind_sensor; + bool irq_enabled; + + void __iomem *regs; +}; + +/* in millicelsius */ +static inline int _step_to_temp(int step) +{ + /* + * Every step equals (1 * 200) / 255 celsius, and finally + * need convert to millicelsius. + */ + return (HISI_TEMP_BASE + (step * 200 / 255)) * 1000; +} + +static inline long _temp_to_step(long temp) +{ + return ((temp / 1000 - HISI_TEMP_BASE) * 255 / 200); +} + +static long hisi_thermal_get_sensor_temp(struct hisi_thermal_data *data, + struct hisi_thermal_sensor *sensor) +{ + long val; + + mutex_lock(&data->thermal_lock); + + /* disable interrupt */ + writel(0x0, data->regs + TEMP0_INT_EN); + writel(0x1, data->regs + TEMP0_INT_CLR); + + /* disable module firstly */ + writel(0x0, data->regs + TEMP0_EN); + + /* select sensor id */ + writel((sensor->id << 12), data->regs + TEMP0_CFG); + + /* enable module */ + writel(0x1, data->regs + TEMP0_EN); + + usleep_range(3000, 5000); + + val = readl(data->regs + TEMP0_VALUE); + val = _step_to_temp(val); + + mutex_unlock(&data->thermal_lock); + + return val; +} + +static void hisi_thermal_enable_bind_irq_sensor + (struct hisi_thermal_data *data) +{ + struct hisi_thermal_sensor *sensor; + + mutex_lock(&data->thermal_lock); + + sensor = &data->sensors[data->irq_bind_sensor]; + + /* setting the hdak time */ + writel(0x0, data->regs + TEMP0_CFG); + + /* disable module firstly */ + writel(0x0, data->regs + TEMP0_RST_MSK); + writel(0x0, data->regs + TEMP0_EN); + + /* select sensor id */ + writel((sensor->id << 12), data->regs + TEMP0_CFG); + + /* enable for interrupt */ + writel(_temp_to_step(sensor->thres_temp) | 0x0FFFFFF00, + data->regs + TEMP0_TH); + + writel(_temp_to_step(HISI_TEMP_RESET), data->regs + TEMP0_RST_TH); + + /* enable module */ + writel(0x1, data->regs + TEMP0_RST_MSK); + writel(0x1, data->regs + TEMP0_EN); + + writel(0x0, data->regs + TEMP0_INT_CLR); + writel(0x1, data->regs + TEMP0_INT_EN); + + usleep_range(3000, 5000); + + mutex_unlock(&data->thermal_lock); +} + +static void hisi_thermal_disable_sensor(struct hisi_thermal_data *data) +{ + mutex_lock(&data->thermal_lock); + + /* disable sensor module */ + writel(0x0, data->regs + TEMP0_INT_EN); + writel(0x0, data->regs + TEMP0_RST_MSK); + writel(0x0, data->regs + TEMP0_EN); + + mutex_unlock(&data->thermal_lock); +} + +static int hisi_thermal_get_temp(void *_sensor, long *temp) +{ + struct hisi_thermal_sensor *sensor = _sensor; + struct hisi_thermal_data *data = sensor->thermal; + + int sensor_id = 0, i; + long max_temp = 0; + + *temp = hisi_thermal_get_sensor_temp(data, sensor); + + sensor->sensor_temp = *temp; + + for (i = 0; i < HISI_MAX_SENSORS; i++) { + if (data->sensors[i].sensor_temp >= max_temp) { + max_temp = data->sensors[i].sensor_temp; + sensor_id = i; + } + } + + mutex_lock(&data->thermal_lock); + data->irq_bind_sensor = sensor_id; + mutex_unlock(&data->thermal_lock); + + dev_dbg(&data->pdev->dev, "id=%d, irq=%d, temp=%ld, thres=%d\n", + sensor->id, data->irq_enabled, *temp, sensor->thres_temp); + /* + * Bind irq to sensor for two cases: + * Reenable alarm IRQ if temperature below threshold; + * if irq has been enabled, always set it; + */ + if (data->irq_enabled) { + hisi_thermal_enable_bind_irq_sensor(data); + return 0; + } + + if (max_temp < sensor->thres_temp) { + data->irq_enabled = true; + hisi_thermal_enable_bind_irq_sensor(data); + enable_irq(data->irq); + } + + return 0; +} + +static struct thermal_zone_of_device_ops hisi_of_thermal_ops = { + .get_temp = hisi_thermal_get_temp, +}; + +static irqreturn_t hisi_thermal_alarm_irq(int irq, void *dev) +{ + struct hisi_thermal_data *data = dev; + + disable_irq_nosync(irq); + data->irq_enabled = false; + + return IRQ_WAKE_THREAD; +} + +static irqreturn_t hisi_thermal_alarm_irq_thread(int irq, void *dev) +{ + struct hisi_thermal_data *data = dev; + struct hisi_thermal_sensor *sensor; + int i; + + mutex_lock(&data->thermal_lock); + sensor = &data->sensors[data->irq_bind_sensor]; + + dev_crit(&data->pdev->dev, "THERMAL ALARM: T > %d\n", + sensor->thres_temp / 1000); + mutex_unlock(&data->thermal_lock); + + for (i = 0; i < HISI_MAX_SENSORS; i++) + thermal_zone_device_update(data->sensors[i].tzd); + + return IRQ_HANDLED; +} + +static int hisi_thermal_register_sensor(struct platform_device *pdev, + struct hisi_thermal_data *data, + struct hisi_thermal_sensor *sensor, + int index) +{ + int ret, i; + const struct thermal_trip *trip; + + sensor->id = index; + sensor->thermal = data; + + sensor->tzd = thermal_zone_of_sensor_register(&pdev->dev, sensor->id, + sensor, &hisi_of_thermal_ops); + if (IS_ERR(sensor->tzd)) { + ret = PTR_ERR(sensor->tzd); + dev_err(&pdev->dev, "failed to register sensor id %d: %d\n", + sensor->id, ret); + return ret; + } + + trip = of_thermal_get_trip_points(sensor->tzd); + + for (i = 0; i < of_thermal_get_ntrips(sensor->tzd); i++) { + if (trip[i].type == THERMAL_TRIP_PASSIVE) { + sensor->thres_temp = trip[i].temperature; + break; + } + } + + return 0; +} + +static const struct of_device_id of_hisi_thermal_match[] = { + { .compatible = "hisilicon,tsensor" }, + { /* end */ } +}; +MODULE_DEVICE_TABLE(of, of_hisi_thermal_match); + +static void hisi_thermal_toggle_sensor(struct hisi_thermal_sensor *sensor, + bool on) +{ + struct thermal_zone_device *tzd = sensor->tzd; + + tzd->ops->set_mode(tzd, + on ? THERMAL_DEVICE_ENABLED : THERMAL_DEVICE_DISABLED); +} + +static int hisi_thermal_probe(struct platform_device *pdev) +{ + struct hisi_thermal_data *data; + struct resource *res; + int i; + int ret; + + data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL); + if (!data) + return -ENOMEM; + + mutex_init(&data->thermal_lock); + data->pdev = pdev; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + data->regs = devm_ioremap_resource(&pdev->dev, res); + if (IS_ERR(data->regs)) { + dev_err(&pdev->dev, "failed to get io address\n"); + return PTR_ERR(data->regs); + } + + data->irq = platform_get_irq(pdev, 0); + if (data->irq < 0) + return data->irq; + + ret = devm_request_threaded_irq(&pdev->dev, data->irq, + hisi_thermal_alarm_irq, + hisi_thermal_alarm_irq_thread, + 0, "hisi_thermal", data); + if (ret < 0) { + dev_err(&pdev->dev, "failed to request alarm irq: %d\n", ret); + return ret; + } + + platform_set_drvdata(pdev, data); + + data->clk = devm_clk_get(&pdev->dev, "thermal_clk"); + if (IS_ERR(data->clk)) { + ret = PTR_ERR(data->clk); + if (ret != -EPROBE_DEFER) + dev_err(&pdev->dev, + "failed to get thermal clk: %d\n", ret); + return ret; + } + + /* enable clock for thermal */ + ret = clk_prepare_enable(data->clk); + if (ret) { + dev_err(&pdev->dev, "failed to enable thermal clk: %d\n", ret); + return ret; + } + + for (i = 0; i < HISI_MAX_SENSORS; ++i) { + ret = hisi_thermal_register_sensor(pdev, data, + &data->sensors[i], i); + if (ret) { + dev_err(&pdev->dev, + "failed to register thermal sensor: %d\n", ret); + goto err_get_sensor_data; + } + } + + hisi_thermal_enable_bind_irq_sensor(data); + data->irq_enabled = true; + + for (i = 0; i < HISI_MAX_SENSORS; i++) + hisi_thermal_toggle_sensor(&data->sensors[i], true); + + return 0; + +err_get_sensor_data: + clk_disable_unprepare(data->clk); + + return ret; +} + +static int hisi_thermal_remove(struct platform_device *pdev) +{ + struct hisi_thermal_data *data = platform_get_drvdata(pdev); + int i; + + for (i = 0; i < HISI_MAX_SENSORS; i++) { + struct hisi_thermal_sensor *sensor = &data->sensors[i]; + + hisi_thermal_toggle_sensor(sensor, false); + thermal_zone_of_sensor_unregister(&pdev->dev, sensor->tzd); + } + + hisi_thermal_disable_sensor(data); + clk_disable_unprepare(data->clk); + + return 0; +} + +#ifdef CONFIG_PM_SLEEP +static int hisi_thermal_suspend(struct device *dev) +{ + struct hisi_thermal_data *data = dev_get_drvdata(dev); + + hisi_thermal_disable_sensor(data); + data->irq_enabled = false; + + clk_disable_unprepare(data->clk); + + return 0; +} + +static int hisi_thermal_resume(struct device *dev) +{ + struct hisi_thermal_data *data = dev_get_drvdata(dev); + + clk_prepare_enable(data->clk); + + data->irq_enabled = true; + hisi_thermal_enable_bind_irq_sensor(data); + + return 0; +} +#endif + +static SIMPLE_DEV_PM_OPS(hisi_thermal_pm_ops, + hisi_thermal_suspend, hisi_thermal_resume); + +static struct platform_driver hisi_thermal_driver = { + .driver = { + .name = "hisi_thermal", + .owner = THIS_MODULE, + .pm = &hisi_thermal_pm_ops, + .of_match_table = of_hisi_thermal_match, + }, + .probe = hisi_thermal_probe, + .remove = hisi_thermal_remove, +}; + +module_platform_driver(hisi_thermal_driver); + +MODULE_AUTHOR("Xinwei Kong <kong.kongxinwei@hisilicon.com>"); +MODULE_AUTHOR("Leo Yan <leo.yan@linaro.org>"); +MODULE_DESCRIPTION("Hisilicon thermal driver"); +MODULE_LICENSE("GPL v2"); |
