diff options
Diffstat (limited to 'drivers/thermal/hisi_thermal.c')
| -rw-r--r-- | drivers/thermal/hisi_thermal.c | 627 |
1 files changed, 627 insertions, 0 deletions
diff --git a/drivers/thermal/hisi_thermal.c b/drivers/thermal/hisi_thermal.c new file mode 100644 index 000000000..761d0559c --- /dev/null +++ b/drivers/thermal/hisi_thermal.c @@ -0,0 +1,627 @@ +/* + * 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 <linux/of_device.h> + +#include "thermal_core.h" + +#define HI6220_TEMP0_LAG (0x0) +#define HI6220_TEMP0_TH (0x4) +#define HI6220_TEMP0_RST_TH (0x8) +#define HI6220_TEMP0_CFG (0xC) +#define HI6220_TEMP0_CFG_SS_MSK (0xF000) +#define HI6220_TEMP0_CFG_HDAK_MSK (0x30) +#define HI6220_TEMP0_EN (0x10) +#define HI6220_TEMP0_INT_EN (0x14) +#define HI6220_TEMP0_INT_CLR (0x18) +#define HI6220_TEMP0_RST_MSK (0x1C) +#define HI6220_TEMP0_VALUE (0x28) + +#define HI3660_OFFSET(chan) ((chan) * 0x40) +#define HI3660_TEMP(chan) (HI3660_OFFSET(chan) + 0x1C) +#define HI3660_TH(chan) (HI3660_OFFSET(chan) + 0x20) +#define HI3660_LAG(chan) (HI3660_OFFSET(chan) + 0x28) +#define HI3660_INT_EN(chan) (HI3660_OFFSET(chan) + 0x2C) +#define HI3660_INT_CLR(chan) (HI3660_OFFSET(chan) + 0x30) + +#define HI6220_TEMP_BASE (-60000) +#define HI6220_TEMP_RESET (100000) +#define HI6220_TEMP_STEP (785) +#define HI6220_TEMP_LAG (3500) + +#define HI3660_TEMP_BASE (-63780) +#define HI3660_TEMP_STEP (205) +#define HI3660_TEMP_LAG (4000) + +#define HI6220_DEFAULT_SENSOR 2 +#define HI3660_DEFAULT_SENSOR 1 + +struct hisi_thermal_sensor { + struct thermal_zone_device *tzd; + uint32_t id; + uint32_t thres_temp; +}; + +struct hisi_thermal_data { + int (*get_temp)(struct hisi_thermal_data *data); + int (*enable_sensor)(struct hisi_thermal_data *data); + int (*disable_sensor)(struct hisi_thermal_data *data); + int (*irq_handler)(struct hisi_thermal_data *data); + struct platform_device *pdev; + struct clk *clk; + struct hisi_thermal_sensor sensor; + void __iomem *regs; + int irq; +}; + +/* + * The temperature computation on the tsensor is as follow: + * Unit: millidegree Celsius + * Step: 200/255 (0.7843) + * Temperature base: -60°C + * + * The register is programmed in temperature steps, every step is 785 + * millidegree and begins at -60 000 m°C + * + * The temperature from the steps: + * + * Temp = TempBase + (steps x 785) + * + * and the steps from the temperature: + * + * steps = (Temp - TempBase) / 785 + * + */ +static inline int hi6220_thermal_step_to_temp(int step) +{ + return HI6220_TEMP_BASE + (step * HI6220_TEMP_STEP); +} + +static inline int hi6220_thermal_temp_to_step(int temp) +{ + return DIV_ROUND_UP(temp - HI6220_TEMP_BASE, HI6220_TEMP_STEP); +} + +/* + * for Hi3660, + * Step: 189/922 (0.205) + * Temperature base: -63.780°C + * + * The register is programmed in temperature steps, every step is 205 + * millidegree and begins at -63 780 m°C + */ +static inline int hi3660_thermal_step_to_temp(int step) +{ + return HI3660_TEMP_BASE + step * HI3660_TEMP_STEP; +} + +static inline int hi3660_thermal_temp_to_step(int temp) +{ + return DIV_ROUND_UP(temp - HI3660_TEMP_BASE, HI3660_TEMP_STEP); +} + +/* + * The lag register contains 5 bits encoding the temperature in steps. + * + * Each time the temperature crosses the threshold boundary, an + * interrupt is raised. It could be when the temperature is going + * above the threshold or below. However, if the temperature is + * fluctuating around this value due to the load, we can receive + * several interrupts which may not desired. + * + * We can setup a temperature representing the delta between the + * threshold and the current temperature when the temperature is + * decreasing. + * + * For instance: the lag register is 5°C, the threshold is 65°C, when + * the temperature reaches 65°C an interrupt is raised and when the + * temperature decrease to 65°C - 5°C another interrupt is raised. + * + * A very short lag can lead to an interrupt storm, a long lag + * increase the latency to react to the temperature changes. In our + * case, that is not really a problem as we are polling the + * temperature. + * + * [0:4] : lag register + * + * The temperature is coded in steps, cf. HI6220_TEMP_STEP. + * + * Min : 0x00 : 0.0 °C + * Max : 0x1F : 24.3 °C + * + * The 'value' parameter is in milliCelsius. + */ +static inline void hi6220_thermal_set_lag(void __iomem *addr, int value) +{ + writel(DIV_ROUND_UP(value, HI6220_TEMP_STEP) & 0x1F, + addr + HI6220_TEMP0_LAG); +} + +static inline void hi6220_thermal_alarm_clear(void __iomem *addr, int value) +{ + writel(value, addr + HI6220_TEMP0_INT_CLR); +} + +static inline void hi6220_thermal_alarm_enable(void __iomem *addr, int value) +{ + writel(value, addr + HI6220_TEMP0_INT_EN); +} + +static inline void hi6220_thermal_alarm_set(void __iomem *addr, int temp) +{ + writel(hi6220_thermal_temp_to_step(temp) | 0x0FFFFFF00, + addr + HI6220_TEMP0_TH); +} + +static inline void hi6220_thermal_reset_set(void __iomem *addr, int temp) +{ + writel(hi6220_thermal_temp_to_step(temp), addr + HI6220_TEMP0_RST_TH); +} + +static inline void hi6220_thermal_reset_enable(void __iomem *addr, int value) +{ + writel(value, addr + HI6220_TEMP0_RST_MSK); +} + +static inline void hi6220_thermal_enable(void __iomem *addr, int value) +{ + writel(value, addr + HI6220_TEMP0_EN); +} + +static inline int hi6220_thermal_get_temperature(void __iomem *addr) +{ + return hi6220_thermal_step_to_temp(readl(addr + HI6220_TEMP0_VALUE)); +} + +/* + * [0:6] lag register + * + * The temperature is coded in steps, cf. HI3660_TEMP_STEP. + * + * Min : 0x00 : 0.0 °C + * Max : 0x7F : 26.0 °C + * + */ +static inline void hi3660_thermal_set_lag(void __iomem *addr, + int id, int value) +{ + writel(DIV_ROUND_UP(value, HI3660_TEMP_STEP) & 0x7F, + addr + HI3660_LAG(id)); +} + +static inline void hi3660_thermal_alarm_clear(void __iomem *addr, + int id, int value) +{ + writel(value, addr + HI3660_INT_CLR(id)); +} + +static inline void hi3660_thermal_alarm_enable(void __iomem *addr, + int id, int value) +{ + writel(value, addr + HI3660_INT_EN(id)); +} + +static inline void hi3660_thermal_alarm_set(void __iomem *addr, + int id, int value) +{ + writel(value, addr + HI3660_TH(id)); +} + +static inline int hi3660_thermal_get_temperature(void __iomem *addr, int id) +{ + return hi3660_thermal_step_to_temp(readl(addr + HI3660_TEMP(id))); +} + +/* + * Temperature configuration register - Sensor selection + * + * Bits [19:12] + * + * 0x0: local sensor (default) + * 0x1: remote sensor 1 (ACPU cluster 1) + * 0x2: remote sensor 2 (ACPU cluster 0) + * 0x3: remote sensor 3 (G3D) + */ +static inline void hi6220_thermal_sensor_select(void __iomem *addr, int sensor) +{ + writel((readl(addr + HI6220_TEMP0_CFG) & ~HI6220_TEMP0_CFG_SS_MSK) | + (sensor << 12), addr + HI6220_TEMP0_CFG); +} + +/* + * Temperature configuration register - Hdak conversion polling interval + * + * Bits [5:4] + * + * 0x0 : 0.768 ms + * 0x1 : 6.144 ms + * 0x2 : 49.152 ms + * 0x3 : 393.216 ms + */ +static inline void hi6220_thermal_hdak_set(void __iomem *addr, int value) +{ + writel((readl(addr + HI6220_TEMP0_CFG) & ~HI6220_TEMP0_CFG_HDAK_MSK) | + (value << 4), addr + HI6220_TEMP0_CFG); +} + +static int hi6220_thermal_irq_handler(struct hisi_thermal_data *data) +{ + hi6220_thermal_alarm_clear(data->regs, 1); + return 0; +} + +static int hi3660_thermal_irq_handler(struct hisi_thermal_data *data) +{ + hi3660_thermal_alarm_clear(data->regs, data->sensor.id, 1); + return 0; +} + +static int hi6220_thermal_get_temp(struct hisi_thermal_data *data) +{ + return hi6220_thermal_get_temperature(data->regs); +} + +static int hi3660_thermal_get_temp(struct hisi_thermal_data *data) +{ + return hi3660_thermal_get_temperature(data->regs, data->sensor.id); +} + +static int hi6220_thermal_disable_sensor(struct hisi_thermal_data *data) +{ + /* disable sensor module */ + hi6220_thermal_enable(data->regs, 0); + hi6220_thermal_alarm_enable(data->regs, 0); + hi6220_thermal_reset_enable(data->regs, 0); + + clk_disable_unprepare(data->clk); + + return 0; +} + +static int hi3660_thermal_disable_sensor(struct hisi_thermal_data *data) +{ + /* disable sensor module */ + hi3660_thermal_alarm_enable(data->regs, data->sensor.id, 0); + return 0; +} + +static int hi6220_thermal_enable_sensor(struct hisi_thermal_data *data) +{ + struct hisi_thermal_sensor *sensor = &data->sensor; + int ret; + + /* enable clock for tsensor */ + ret = clk_prepare_enable(data->clk); + if (ret) + return ret; + + /* disable module firstly */ + hi6220_thermal_reset_enable(data->regs, 0); + hi6220_thermal_enable(data->regs, 0); + + /* select sensor id */ + hi6220_thermal_sensor_select(data->regs, sensor->id); + + /* setting the hdak time */ + hi6220_thermal_hdak_set(data->regs, 0); + + /* setting lag value between current temp and the threshold */ + hi6220_thermal_set_lag(data->regs, HI6220_TEMP_LAG); + + /* enable for interrupt */ + hi6220_thermal_alarm_set(data->regs, sensor->thres_temp); + + hi6220_thermal_reset_set(data->regs, HI6220_TEMP_RESET); + + /* enable module */ + hi6220_thermal_reset_enable(data->regs, 1); + hi6220_thermal_enable(data->regs, 1); + + hi6220_thermal_alarm_clear(data->regs, 0); + hi6220_thermal_alarm_enable(data->regs, 1); + + return 0; +} + +static int hi3660_thermal_enable_sensor(struct hisi_thermal_data *data) +{ + unsigned int value; + struct hisi_thermal_sensor *sensor = &data->sensor; + + /* disable interrupt */ + hi3660_thermal_alarm_enable(data->regs, sensor->id, 0); + + /* setting lag value between current temp and the threshold */ + hi3660_thermal_set_lag(data->regs, sensor->id, HI3660_TEMP_LAG); + + /* set interrupt threshold */ + value = hi3660_thermal_temp_to_step(sensor->thres_temp); + hi3660_thermal_alarm_set(data->regs, sensor->id, value); + + /* enable interrupt */ + hi3660_thermal_alarm_clear(data->regs, sensor->id, 1); + hi3660_thermal_alarm_enable(data->regs, sensor->id, 1); + + return 0; +} + +static int hi6220_thermal_probe(struct hisi_thermal_data *data) +{ + struct platform_device *pdev = data->pdev; + struct device *dev = &pdev->dev; + struct resource *res; + int ret; + + data->get_temp = hi6220_thermal_get_temp; + data->enable_sensor = hi6220_thermal_enable_sensor; + data->disable_sensor = hi6220_thermal_disable_sensor; + data->irq_handler = hi6220_thermal_irq_handler; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + data->regs = devm_ioremap_resource(dev, res); + if (IS_ERR(data->regs)) { + dev_err(dev, "failed to get io address\n"); + return PTR_ERR(data->regs); + } + + data->clk = devm_clk_get(dev, "thermal_clk"); + if (IS_ERR(data->clk)) { + ret = PTR_ERR(data->clk); + if (ret != -EPROBE_DEFER) + dev_err(dev, "failed to get thermal clk: %d\n", ret); + return ret; + } + + data->irq = platform_get_irq(pdev, 0); + if (data->irq < 0) + return data->irq; + + data->sensor.id = HI6220_DEFAULT_SENSOR; + + return 0; +} + +static int hi3660_thermal_probe(struct hisi_thermal_data *data) +{ + struct platform_device *pdev = data->pdev; + struct device *dev = &pdev->dev; + struct resource *res; + + data->get_temp = hi3660_thermal_get_temp; + data->enable_sensor = hi3660_thermal_enable_sensor; + data->disable_sensor = hi3660_thermal_disable_sensor; + data->irq_handler = hi3660_thermal_irq_handler; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + data->regs = devm_ioremap_resource(dev, res); + if (IS_ERR(data->regs)) { + dev_err(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; + + data->sensor.id = HI3660_DEFAULT_SENSOR; + + return 0; +} + +static int hisi_thermal_get_temp(void *__data, int *temp) +{ + struct hisi_thermal_data *data = __data; + struct hisi_thermal_sensor *sensor = &data->sensor; + + *temp = data->get_temp(data); + + dev_dbg(&data->pdev->dev, "id=%d, temp=%d, thres=%d\n", + sensor->id, *temp, sensor->thres_temp); + + return 0; +} + +static const struct thermal_zone_of_device_ops hisi_of_thermal_ops = { + .get_temp = hisi_thermal_get_temp, +}; + +static irqreturn_t hisi_thermal_alarm_irq_thread(int irq, void *dev) +{ + struct hisi_thermal_data *data = dev; + struct hisi_thermal_sensor *sensor = &data->sensor; + int temp = 0; + + data->irq_handler(data); + + hisi_thermal_get_temp(data, &temp); + + if (temp >= sensor->thres_temp) { + dev_crit(&data->pdev->dev, "THERMAL ALARM: %d > %d\n", + temp, sensor->thres_temp); + + thermal_zone_device_update(data->sensor.tzd, + THERMAL_EVENT_UNSPECIFIED); + + } else { + dev_crit(&data->pdev->dev, "THERMAL ALARM stopped: %d < %d\n", + temp, sensor->thres_temp); + } + + return IRQ_HANDLED; +} + +static int hisi_thermal_register_sensor(struct platform_device *pdev, + struct hisi_thermal_data *data, + struct hisi_thermal_sensor *sensor) +{ + int ret, i; + const struct thermal_trip *trip; + + sensor->tzd = devm_thermal_zone_of_sensor_register(&pdev->dev, + sensor->id, data, + &hisi_of_thermal_ops); + if (IS_ERR(sensor->tzd)) { + ret = PTR_ERR(sensor->tzd); + sensor->tzd = NULL; + 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", + .data = hi6220_thermal_probe + }, + { + .compatible = "hisilicon,hi3660-tsensor", + .data = hi3660_thermal_probe + }, + { /* 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; + int (*platform_probe)(struct hisi_thermal_data *); + struct device *dev = &pdev->dev; + int ret; + + data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL); + if (!data) + return -ENOMEM; + + data->pdev = pdev; + platform_set_drvdata(pdev, data); + + platform_probe = of_device_get_match_data(dev); + if (!platform_probe) { + dev_err(dev, "failed to get probe func\n"); + return -EINVAL; + } + + ret = platform_probe(data); + if (ret) + return ret; + + ret = hisi_thermal_register_sensor(pdev, data, + &data->sensor); + if (ret) { + dev_err(dev, "failed to register thermal sensor: %d\n", ret); + return ret; + } + + ret = data->enable_sensor(data); + if (ret) { + dev_err(dev, "Failed to setup the sensor: %d\n", ret); + return ret; + } + + if (data->irq) { + ret = devm_request_threaded_irq(dev, data->irq, NULL, + hisi_thermal_alarm_irq_thread, + IRQF_ONESHOT, "hisi_thermal", data); + if (ret < 0) { + dev_err(dev, "failed to request alarm irq: %d\n", ret); + return ret; + } + } + + hisi_thermal_toggle_sensor(&data->sensor, true); + + return 0; +} + +static int hisi_thermal_remove(struct platform_device *pdev) +{ + struct hisi_thermal_data *data = platform_get_drvdata(pdev); + struct hisi_thermal_sensor *sensor = &data->sensor; + + hisi_thermal_toggle_sensor(sensor, false); + + data->disable_sensor(data); + + return 0; +} + +#ifdef CONFIG_PM_SLEEP +static int hisi_thermal_suspend(struct device *dev) +{ + struct hisi_thermal_data *data = dev_get_drvdata(dev); + + data->disable_sensor(data); + + return 0; +} + +static int hisi_thermal_resume(struct device *dev) +{ + struct hisi_thermal_data *data = dev_get_drvdata(dev); + + return data->enable_sensor(data); +} +#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", + .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"); |