| /* |
| * 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_CLUSTER0_SENSOR 2 |
| #define HI6220_CLUSTER1_SENSOR 1 |
| |
| #define HI3660_LITTLE_SENSOR 0 |
| #define HI3660_BIG_SENSOR 1 |
| #define HI3660_G3D_SENSOR 2 |
| #define HI3660_MODEM_SENSOR 3 |
| |
| struct hisi_thermal_data; |
| |
| struct hisi_thermal_sensor { |
| struct hisi_thermal_data *data; |
| struct thermal_zone_device *tzd; |
| const char *irq_name; |
| uint32_t id; |
| uint32_t thres_temp; |
| }; |
| |
| struct hisi_thermal_ops { |
| int (*get_temp)(struct hisi_thermal_sensor *sensor); |
| int (*enable_sensor)(struct hisi_thermal_sensor *sensor); |
| int (*disable_sensor)(struct hisi_thermal_sensor *sensor); |
| int (*irq_handler)(struct hisi_thermal_sensor *sensor); |
| int (*probe)(struct hisi_thermal_data *data); |
| }; |
| |
| struct hisi_thermal_data { |
| const struct hisi_thermal_ops *ops; |
| struct hisi_thermal_sensor *sensor; |
| struct platform_device *pdev; |
| struct clk *clk; |
| void __iomem *regs; |
| int nr_sensors; |
| }; |
| |
| /* |
| * 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_sensor *sensor) |
| { |
| struct hisi_thermal_data *data = sensor->data; |
| |
| hi6220_thermal_alarm_clear(data->regs, 1); |
| return 0; |
| } |
| |
| static int hi3660_thermal_irq_handler(struct hisi_thermal_sensor *sensor) |
| { |
| struct hisi_thermal_data *data = sensor->data; |
| |
| hi3660_thermal_alarm_clear(data->regs, sensor->id, 1); |
| return 0; |
| } |
| |
| static int hi6220_thermal_get_temp(struct hisi_thermal_sensor *sensor) |
| { |
| struct hisi_thermal_data *data = sensor->data; |
| |
| return hi6220_thermal_get_temperature(data->regs); |
| } |
| |
| static int hi3660_thermal_get_temp(struct hisi_thermal_sensor *sensor) |
| { |
| struct hisi_thermal_data *data = sensor->data; |
| |
| return hi3660_thermal_get_temperature(data->regs, sensor->id); |
| } |
| |
| static int hi6220_thermal_disable_sensor(struct hisi_thermal_sensor *sensor) |
| { |
| struct hisi_thermal_data *data = sensor->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_sensor *sensor) |
| { |
| struct hisi_thermal_data *data = sensor->data; |
| |
| /* disable sensor module */ |
| hi3660_thermal_alarm_enable(data->regs, sensor->id, 0); |
| return 0; |
| } |
| |
| static int hi6220_thermal_enable_sensor(struct hisi_thermal_sensor *sensor) |
| { |
| struct hisi_thermal_data *data = sensor->data; |
| 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_sensor *sensor) |
| { |
| unsigned int value; |
| struct hisi_thermal_data *data = sensor->data; |
| |
| /* 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; |
| int ret; |
| |
| 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->sensor = devm_kzalloc(dev, sizeof(*data->sensor), GFP_KERNEL); |
| if (!data->sensor) |
| return -ENOMEM; |
| |
| data->sensor[0].id = HI6220_CLUSTER0_SENSOR; |
| data->sensor[0].irq_name = "tsensor_intr"; |
| data->sensor[0].data = data; |
| data->nr_sensors = 1; |
| |
| return 0; |
| } |
| |
| static int hi3660_thermal_probe(struct hisi_thermal_data *data) |
| { |
| struct platform_device *pdev = data->pdev; |
| struct device *dev = &pdev->dev; |
| |
| data->nr_sensors = 1; |
| |
| data->sensor = devm_kzalloc(dev, sizeof(*data->sensor) * |
| data->nr_sensors, GFP_KERNEL); |
| if (!data->sensor) |
| return -ENOMEM; |
| |
| data->sensor[0].id = HI3660_BIG_SENSOR; |
| data->sensor[0].irq_name = "tsensor_a73"; |
| data->sensor[0].data = data; |
| |
| return 0; |
| } |
| |
| static int hisi_thermal_get_temp(void *__data, int *temp) |
| { |
| struct hisi_thermal_sensor *sensor = __data; |
| struct hisi_thermal_data *data = sensor->data; |
| |
| *temp = data->ops->get_temp(sensor); |
| |
| dev_dbg(&data->pdev->dev, "tzd=%p, id=%d, temp=%d, thres=%d\n", |
| sensor->tzd, 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_sensor *sensor = dev; |
| struct hisi_thermal_data *data = sensor->data; |
| int temp = 0; |
| |
| data->ops->irq_handler(sensor); |
| |
| hisi_thermal_get_temp(sensor, &temp); |
| |
| if (temp >= sensor->thres_temp) { |
| dev_crit(&data->pdev->dev, |
| "sensor <%d> THERMAL ALARM: %d > %d\n", |
| sensor->id, temp, sensor->thres_temp); |
| |
| thermal_zone_device_update(sensor->tzd, |
| THERMAL_EVENT_UNSPECIFIED); |
| |
| } else { |
| dev_crit(&data->pdev->dev, |
| "sensor <%d> THERMAL ALARM stopped: %d < %d\n", |
| sensor->id, temp, sensor->thres_temp); |
| } |
| |
| return IRQ_HANDLED; |
| } |
| |
| static int hisi_thermal_register_sensor(struct platform_device *pdev, |
| 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, sensor, |
| &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 hisi_thermal_ops hi6220_ops = { |
| .get_temp = hi6220_thermal_get_temp, |
| .enable_sensor = hi6220_thermal_enable_sensor, |
| .disable_sensor = hi6220_thermal_disable_sensor, |
| .irq_handler = hi6220_thermal_irq_handler, |
| .probe = hi6220_thermal_probe, |
| }; |
| |
| static const struct hisi_thermal_ops hi3660_ops = { |
| .get_temp = hi3660_thermal_get_temp, |
| .enable_sensor = hi3660_thermal_enable_sensor, |
| .disable_sensor = hi3660_thermal_disable_sensor, |
| .irq_handler = hi3660_thermal_irq_handler, |
| .probe = hi3660_thermal_probe, |
| }; |
| |
| static const struct of_device_id of_hisi_thermal_match[] = { |
| { |
| .compatible = "hisilicon,tsensor", |
| .data = &hi6220_ops, |
| }, |
| { |
| .compatible = "hisilicon,hi3660-tsensor", |
| .data = &hi3660_ops, |
| }, |
| { /* 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 device *dev = &pdev->dev; |
| struct resource *res; |
| int i, ret; |
| |
| data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL); |
| if (!data) |
| return -ENOMEM; |
| |
| data->pdev = pdev; |
| platform_set_drvdata(pdev, data); |
| data->ops = of_device_get_match_data(dev); |
| |
| 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); |
| } |
| |
| ret = data->ops->probe(data); |
| if (ret) |
| return ret; |
| |
| for (i = 0; i < data->nr_sensors; i++) { |
| struct hisi_thermal_sensor *sensor = &data->sensor[i]; |
| |
| ret = hisi_thermal_register_sensor(pdev, sensor); |
| if (ret) { |
| dev_err(dev, "failed to register thermal sensor: %d\n", |
| ret); |
| return ret; |
| } |
| |
| ret = platform_get_irq(pdev, 0); |
| if (ret < 0) |
| return ret; |
| |
| ret = devm_request_threaded_irq(dev, ret, NULL, |
| hisi_thermal_alarm_irq_thread, |
| IRQF_ONESHOT, sensor->irq_name, |
| sensor); |
| if (ret < 0) { |
| dev_err(dev, "Failed to request alarm irq: %d\n", ret); |
| return ret; |
| } |
| |
| ret = data->ops->enable_sensor(sensor); |
| if (ret) { |
| dev_err(dev, "Failed to setup the sensor: %d\n", ret); |
| return ret; |
| } |
| |
| hisi_thermal_toggle_sensor(sensor, true); |
| } |
| |
| return 0; |
| } |
| |
| static int hisi_thermal_remove(struct platform_device *pdev) |
| { |
| struct hisi_thermal_data *data = platform_get_drvdata(pdev); |
| int i; |
| |
| for (i = 0; i < data->nr_sensors; i++) { |
| struct hisi_thermal_sensor *sensor = &data->sensor[i]; |
| |
| hisi_thermal_toggle_sensor(sensor, false); |
| data->ops->disable_sensor(sensor); |
| } |
| |
| return 0; |
| } |
| |
| #ifdef CONFIG_PM_SLEEP |
| static int hisi_thermal_suspend(struct device *dev) |
| { |
| struct hisi_thermal_data *data = dev_get_drvdata(dev); |
| int i; |
| |
| for (i = 0; i < data->nr_sensors; i++) |
| data->ops->disable_sensor(&data->sensor[i]); |
| |
| return 0; |
| } |
| |
| static int hisi_thermal_resume(struct device *dev) |
| { |
| struct hisi_thermal_data *data = dev_get_drvdata(dev); |
| int i, ret = 0; |
| |
| for (i = 0; i < data->nr_sensors; i++) |
| ret |= data->ops->enable_sensor(&data->sensor[i]); |
| |
| return ret; |
| } |
| #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"); |