This movement is needed because the hwmon entries and corresponding sysfs interface is a duplicate of utilities already provided by driver/thermal/thermal_sys.c. The goal is to place it in thermal folder and add necessary functions to use the in-kernel thermal interfaces.
Signed-off-by: Amit Daniel Kachhap amit.kachhap@linaro.org Signed-off-by: Donggeun Kim dg77.kim@samsung.com --- Documentation/hwmon/exynos4_tmu | 81 ------ Documentation/thermal/exynos4_tmu | 52 ++++ drivers/hwmon/Kconfig | 10 - drivers/hwmon/Makefile | 1 - drivers/hwmon/exynos4_tmu.c | 514 ------------------------------------- drivers/thermal/Kconfig | 10 + drivers/thermal/Makefile | 1 + drivers/thermal/exynos4_thermal.c | 409 +++++++++++++++++++++++++++++ 8 files changed, 472 insertions(+), 606 deletions(-) delete mode 100644 Documentation/hwmon/exynos4_tmu create mode 100644 Documentation/thermal/exynos4_tmu delete mode 100644 drivers/hwmon/exynos4_tmu.c create mode 100644 drivers/thermal/exynos4_thermal.c
diff --git a/Documentation/hwmon/exynos4_tmu b/Documentation/hwmon/exynos4_tmu deleted file mode 100644 index c3c6b41..0000000 --- a/Documentation/hwmon/exynos4_tmu +++ /dev/null @@ -1,81 +0,0 @@ -Kernel driver exynos4_tmu -================= - -Supported chips: -* ARM SAMSUNG EXYNOS4 series of SoC - Prefix: 'exynos4-tmu' - Datasheet: Not publicly available - -Authors: Donggeun Kim dg77.kim@samsung.com - -Description ------------ - -This driver allows to read temperature inside SAMSUNG EXYNOS4 series of SoC. - -The chip only exposes the measured 8-bit temperature code value -through a register. -Temperature can be taken from the temperature code. -There are three equations converting from temperature to temperature code. - -The three equations are: - 1. Two point trimming - Tc = (T - 25) * (TI2 - TI1) / (85 - 25) + TI1 - - 2. One point trimming - Tc = T + TI1 - 25 - - 3. No trimming - Tc = T + 50 - - Tc: Temperature code, T: Temperature, - TI1: Trimming info for 25 degree Celsius (stored at TRIMINFO register) - Temperature code measured at 25 degree Celsius which is unchanged - TI2: Trimming info for 85 degree Celsius (stored at TRIMINFO register) - Temperature code measured at 85 degree Celsius which is unchanged - -TMU(Thermal Management Unit) in EXYNOS4 generates interrupt -when temperature exceeds pre-defined levels. -The maximum number of configurable threshold is four. -The threshold levels are defined as follows: - Level_0: current temperature > trigger_level_0 + threshold - Level_1: current temperature > trigger_level_1 + threshold - Level_2: current temperature > trigger_level_2 + threshold - Level_3: current temperature > trigger_level_3 + threshold - - The threshold and each trigger_level are set - through the corresponding registers. - -When an interrupt occurs, this driver notify user space of -one of four threshold levels for the interrupt -through kobject_uevent_env and sysfs_notify functions. -Although an interrupt condition for level_0 can be set, -it is not notified to user space through sysfs_notify function. - -Sysfs Interface ---------------- -name name of the temperature sensor - RO - -temp1_input temperature - RO - -temp1_max temperature for level_1 interrupt - RO - -temp1_crit temperature for level_2 interrupt - RO - -temp1_emergency temperature for level_3 interrupt - RO - -temp1_max_alarm alarm for level_1 interrupt - RO - -temp1_crit_alarm - alarm for level_2 interrupt - RO - -temp1_emergency_alarm - alarm for level_3 interrupt - RO diff --git a/Documentation/thermal/exynos4_tmu b/Documentation/thermal/exynos4_tmu new file mode 100644 index 0000000..2b46f67 --- /dev/null +++ b/Documentation/thermal/exynos4_tmu @@ -0,0 +1,52 @@ +Kernel driver exynos4_tmu +================= + +Supported chips: +* ARM SAMSUNG EXYNOS4 series of SoC + Prefix: 'exynos4-tmu' + Datasheet: Not publicly available + +Authors: Donggeun Kim dg77.kim@samsung.com + +Description +----------- + +This driver allows to read temperature inside SAMSUNG EXYNOS4 series of SoC. + +The chip only exposes the measured 8-bit temperature code value +through a register. +Temperature can be taken from the temperature code. +There are three equations converting from temperature to temperature code. + +The three equations are: + 1. Two point trimming + Tc = (T - 25) * (TI2 - TI1) / (85 - 25) + TI1 + + 2. One point trimming + Tc = T + TI1 - 25 + + 3. No trimming + Tc = T + 50 + + Tc: Temperature code, T: Temperature, + TI1: Trimming info for 25 degree Celsius (stored at TRIMINFO register) + Temperature code measured at 25 degree Celsius which is unchanged + TI2: Trimming info for 85 degree Celsius (stored at TRIMINFO register) + Temperature code measured at 85 degree Celsius which is unchanged + +TMU(Thermal Management Unit) in EXYNOS4 generates interrupt +when temperature exceeds pre-defined levels. +The maximum number of configurable threshold is four. +The threshold levels are defined as follows: + Level_0: current temperature > trigger_level_0 + threshold + Level_1: current temperature > trigger_level_1 + threshold + Level_2: current temperature > trigger_level_2 + threshold + Level_3: current temperature > trigger_level_3 + threshold + + The threshold and each trigger_level are set + through the corresponding registers. + +When an interrupt occurs, this driver notify kernel thermal framework +with the function exynos4_report_trigger. +Although an interrupt condition for level_0 can be set, +it can be used to synchronize the cooling action. diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig index dad895f..5a29885 100644 --- a/drivers/hwmon/Kconfig +++ b/drivers/hwmon/Kconfig @@ -313,16 +313,6 @@ config SENSORS_DS1621 This driver can also be built as a module. If so, the module will be called ds1621.
-config SENSORS_EXYNOS4_TMU - tristate "Temperature sensor on Samsung EXYNOS4" - depends on ARCH_EXYNOS4 - help - If you say yes here you get support for TMU (Thermal Managment - Unit) on SAMSUNG EXYNOS4 series of SoC. - - This driver can also be built as a module. If so, the module - will be called exynos4-tmu. - config SENSORS_I5K_AMB tristate "FB-DIMM AMB temperature sensor on Intel 5000 series chipsets" depends on PCI && EXPERIMENTAL diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile index 8251ce8..228a4b7 100644 --- a/drivers/hwmon/Makefile +++ b/drivers/hwmon/Makefile @@ -48,7 +48,6 @@ obj-$(CONFIG_SENSORS_DS1621) += ds1621.o obj-$(CONFIG_SENSORS_EMC1403) += emc1403.o obj-$(CONFIG_SENSORS_EMC2103) += emc2103.o obj-$(CONFIG_SENSORS_EMC6W201) += emc6w201.o -obj-$(CONFIG_SENSORS_EXYNOS4_TMU) += exynos4_tmu.o obj-$(CONFIG_SENSORS_F71805F) += f71805f.o obj-$(CONFIG_SENSORS_F71882FG) += f71882fg.o obj-$(CONFIG_SENSORS_F75375S) += f75375s.o diff --git a/drivers/hwmon/exynos4_tmu.c b/drivers/hwmon/exynos4_tmu.c deleted file mode 100644 index f2359a0..0000000 --- a/drivers/hwmon/exynos4_tmu.c +++ /dev/null @@ -1,514 +0,0 @@ -/* - * exynos4_tmu.c - Samsung EXYNOS4 TMU (Thermal Management Unit) - * - * Copyright (C) 2011 Samsung Electronics - * Donggeun Kim dg77.kim@samsung.com - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; either version 2 of the License, or - * (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA - * - */ - -#include <linux/module.h> -#include <linux/err.h> -#include <linux/kernel.h> -#include <linux/slab.h> -#include <linux/platform_device.h> -#include <linux/interrupt.h> -#include <linux/clk.h> -#include <linux/workqueue.h> -#include <linux/sysfs.h> -#include <linux/kobject.h> -#include <linux/io.h> -#include <linux/mutex.h> - -#include <linux/hwmon.h> -#include <linux/hwmon-sysfs.h> - -#include <linux/platform_data/exynos4_tmu.h> - -#define EXYNOS4_TMU_REG_TRIMINFO 0x0 -#define EXYNOS4_TMU_REG_CONTROL 0x20 -#define EXYNOS4_TMU_REG_STATUS 0x28 -#define EXYNOS4_TMU_REG_CURRENT_TEMP 0x40 -#define EXYNOS4_TMU_REG_THRESHOLD_TEMP 0x44 -#define EXYNOS4_TMU_REG_TRIG_LEVEL0 0x50 -#define EXYNOS4_TMU_REG_TRIG_LEVEL1 0x54 -#define EXYNOS4_TMU_REG_TRIG_LEVEL2 0x58 -#define EXYNOS4_TMU_REG_TRIG_LEVEL3 0x5C -#define EXYNOS4_TMU_REG_PAST_TEMP0 0x60 -#define EXYNOS4_TMU_REG_PAST_TEMP1 0x64 -#define EXYNOS4_TMU_REG_PAST_TEMP2 0x68 -#define EXYNOS4_TMU_REG_PAST_TEMP3 0x6C -#define EXYNOS4_TMU_REG_INTEN 0x70 -#define EXYNOS4_TMU_REG_INTSTAT 0x74 -#define EXYNOS4_TMU_REG_INTCLEAR 0x78 - -#define EXYNOS4_TMU_GAIN_SHIFT 8 -#define EXYNOS4_TMU_REF_VOLTAGE_SHIFT 24 - -#define EXYNOS4_TMU_TRIM_TEMP_MASK 0xff -#define EXYNOS4_TMU_CORE_ON 3 -#define EXYNOS4_TMU_CORE_OFF 2 -#define EXYNOS4_TMU_DEF_CODE_TO_TEMP_OFFSET 50 -#define EXYNOS4_TMU_TRIG_LEVEL0_MASK 0x1 -#define EXYNOS4_TMU_TRIG_LEVEL1_MASK 0x10 -#define EXYNOS4_TMU_TRIG_LEVEL2_MASK 0x100 -#define EXYNOS4_TMU_TRIG_LEVEL3_MASK 0x1000 -#define EXYNOS4_TMU_INTCLEAR_VAL 0x1111 - -struct exynos4_tmu_data { - struct exynos4_tmu_platform_data *pdata; - struct device *hwmon_dev; - struct resource *mem; - void __iomem *base; - int irq; - struct work_struct irq_work; - struct mutex lock; - struct clk *clk; - u8 temp_error1, temp_error2; -}; - -/* - * TMU treats temperature as a mapped temperature code. - * The temperature is converted differently depending on the calibration type. - */ -static int temp_to_code(struct exynos4_tmu_data *data, u8 temp) -{ - struct exynos4_tmu_platform_data *pdata = data->pdata; - int temp_code; - - /* temp should range between 25 and 125 */ - if (temp < 25 || temp > 125) { - temp_code = -EINVAL; - goto out; - } - - switch (pdata->cal_type) { - case TYPE_TWO_POINT_TRIMMING: - temp_code = (temp - 25) * - (data->temp_error2 - data->temp_error1) / - (85 - 25) + data->temp_error1; - break; - case TYPE_ONE_POINT_TRIMMING: - temp_code = temp + data->temp_error1 - 25; - break; - default: - temp_code = temp + EXYNOS4_TMU_DEF_CODE_TO_TEMP_OFFSET; - break; - } -out: - return temp_code; -} - -/* - * Calculate a temperature value from a temperature code. - * The unit of the temperature is degree Celsius. - */ -static int code_to_temp(struct exynos4_tmu_data *data, u8 temp_code) -{ - struct exynos4_tmu_platform_data *pdata = data->pdata; - int temp; - - /* temp_code should range between 75 and 175 */ - if (temp_code < 75 || temp_code > 175) { - temp = -ENODATA; - goto out; - } - - switch (pdata->cal_type) { - case TYPE_TWO_POINT_TRIMMING: - temp = (temp_code - data->temp_error1) * (85 - 25) / - (data->temp_error2 - data->temp_error1) + 25; - break; - case TYPE_ONE_POINT_TRIMMING: - temp = temp_code - data->temp_error1 + 25; - break; - default: - temp = temp_code - EXYNOS4_TMU_DEF_CODE_TO_TEMP_OFFSET; - break; - } -out: - return temp; -} - -static int exynos4_tmu_initialize(struct platform_device *pdev) -{ - struct exynos4_tmu_data *data = platform_get_drvdata(pdev); - struct exynos4_tmu_platform_data *pdata = data->pdata; - unsigned int status, trim_info; - int ret = 0, threshold_code; - - mutex_lock(&data->lock); - clk_enable(data->clk); - - status = readb(data->base + EXYNOS4_TMU_REG_STATUS); - if (!status) { - ret = -EBUSY; - goto out; - } - - /* Save trimming info in order to perform calibration */ - trim_info = readl(data->base + EXYNOS4_TMU_REG_TRIMINFO); - data->temp_error1 = trim_info & EXYNOS4_TMU_TRIM_TEMP_MASK; - data->temp_error2 = ((trim_info >> 8) & EXYNOS4_TMU_TRIM_TEMP_MASK); - - /* Write temperature code for threshold */ - threshold_code = temp_to_code(data, pdata->threshold); - if (threshold_code < 0) { - ret = threshold_code; - goto out; - } - writeb(threshold_code, - data->base + EXYNOS4_TMU_REG_THRESHOLD_TEMP); - - writeb(pdata->trigger_levels[0], - data->base + EXYNOS4_TMU_REG_TRIG_LEVEL0); - writeb(pdata->trigger_levels[1], - data->base + EXYNOS4_TMU_REG_TRIG_LEVEL1); - writeb(pdata->trigger_levels[2], - data->base + EXYNOS4_TMU_REG_TRIG_LEVEL2); - writeb(pdata->trigger_levels[3], - data->base + EXYNOS4_TMU_REG_TRIG_LEVEL3); - - writel(EXYNOS4_TMU_INTCLEAR_VAL, - data->base + EXYNOS4_TMU_REG_INTCLEAR); -out: - clk_disable(data->clk); - mutex_unlock(&data->lock); - - return ret; -} - -static void exynos4_tmu_control(struct platform_device *pdev, bool on) -{ - struct exynos4_tmu_data *data = platform_get_drvdata(pdev); - struct exynos4_tmu_platform_data *pdata = data->pdata; - unsigned int con, interrupt_en; - - mutex_lock(&data->lock); - clk_enable(data->clk); - - con = pdata->reference_voltage << EXYNOS4_TMU_REF_VOLTAGE_SHIFT | - pdata->gain << EXYNOS4_TMU_GAIN_SHIFT; - if (on) { - con |= EXYNOS4_TMU_CORE_ON; - interrupt_en = pdata->trigger_level3_en << 12 | - pdata->trigger_level2_en << 8 | - pdata->trigger_level1_en << 4 | - pdata->trigger_level0_en; - } else { - con |= EXYNOS4_TMU_CORE_OFF; - interrupt_en = 0; /* Disable all interrupts */ - } - writel(interrupt_en, data->base + EXYNOS4_TMU_REG_INTEN); - writel(con, data->base + EXYNOS4_TMU_REG_CONTROL); - - clk_disable(data->clk); - mutex_unlock(&data->lock); -} - -static int exynos4_tmu_read(struct exynos4_tmu_data *data) -{ - u8 temp_code; - int temp; - - mutex_lock(&data->lock); - clk_enable(data->clk); - - temp_code = readb(data->base + EXYNOS4_TMU_REG_CURRENT_TEMP); - temp = code_to_temp(data, temp_code); - - clk_disable(data->clk); - mutex_unlock(&data->lock); - - return temp; -} - -static void exynos4_tmu_work(struct work_struct *work) -{ - struct exynos4_tmu_data *data = container_of(work, - struct exynos4_tmu_data, irq_work); - - mutex_lock(&data->lock); - clk_enable(data->clk); - - writel(EXYNOS4_TMU_INTCLEAR_VAL, data->base + EXYNOS4_TMU_REG_INTCLEAR); - - kobject_uevent(&data->hwmon_dev->kobj, KOBJ_CHANGE); - - enable_irq(data->irq); - - clk_disable(data->clk); - mutex_unlock(&data->lock); -} - -static irqreturn_t exynos4_tmu_irq(int irq, void *id) -{ - struct exynos4_tmu_data *data = id; - - disable_irq_nosync(irq); - schedule_work(&data->irq_work); - - return IRQ_HANDLED; -} - -static ssize_t exynos4_tmu_show_name(struct device *dev, - struct device_attribute *attr, char *buf) -{ - return sprintf(buf, "exynos4-tmu\n"); -} - -static ssize_t exynos4_tmu_show_temp(struct device *dev, - struct device_attribute *attr, char *buf) -{ - struct exynos4_tmu_data *data = dev_get_drvdata(dev); - int ret; - - ret = exynos4_tmu_read(data); - if (ret < 0) - return ret; - - /* convert from degree Celsius to millidegree Celsius */ - return sprintf(buf, "%d\n", ret * 1000); -} - -static ssize_t exynos4_tmu_show_alarm(struct device *dev, - struct device_attribute *devattr, char *buf) -{ - struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); - struct exynos4_tmu_data *data = dev_get_drvdata(dev); - struct exynos4_tmu_platform_data *pdata = data->pdata; - int temp; - unsigned int trigger_level; - - temp = exynos4_tmu_read(data); - if (temp < 0) - return temp; - - trigger_level = pdata->threshold + pdata->trigger_levels[attr->index]; - - return sprintf(buf, "%d\n", !!(temp > trigger_level)); -} - -static ssize_t exynos4_tmu_show_level(struct device *dev, - struct device_attribute *devattr, char *buf) -{ - struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); - struct exynos4_tmu_data *data = dev_get_drvdata(dev); - struct exynos4_tmu_platform_data *pdata = data->pdata; - unsigned int temp = pdata->threshold + - pdata->trigger_levels[attr->index]; - - return sprintf(buf, "%u\n", temp * 1000); -} - -static DEVICE_ATTR(name, S_IRUGO, exynos4_tmu_show_name, NULL); -static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, exynos4_tmu_show_temp, NULL, 0); - -static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, - exynos4_tmu_show_alarm, NULL, 1); -static SENSOR_DEVICE_ATTR(temp1_crit_alarm, S_IRUGO, - exynos4_tmu_show_alarm, NULL, 2); -static SENSOR_DEVICE_ATTR(temp1_emergency_alarm, S_IRUGO, - exynos4_tmu_show_alarm, NULL, 3); - -static SENSOR_DEVICE_ATTR(temp1_max, S_IRUGO, exynos4_tmu_show_level, NULL, 1); -static SENSOR_DEVICE_ATTR(temp1_crit, S_IRUGO, exynos4_tmu_show_level, NULL, 2); -static SENSOR_DEVICE_ATTR(temp1_emergency, S_IRUGO, - exynos4_tmu_show_level, NULL, 3); - -static struct attribute *exynos4_tmu_attributes[] = { - &dev_attr_name.attr, - &sensor_dev_attr_temp1_input.dev_attr.attr, - &sensor_dev_attr_temp1_max_alarm.dev_attr.attr, - &sensor_dev_attr_temp1_crit_alarm.dev_attr.attr, - &sensor_dev_attr_temp1_emergency_alarm.dev_attr.attr, - &sensor_dev_attr_temp1_max.dev_attr.attr, - &sensor_dev_attr_temp1_crit.dev_attr.attr, - &sensor_dev_attr_temp1_emergency.dev_attr.attr, - NULL, -}; - -static const struct attribute_group exynos4_tmu_attr_group = { - .attrs = exynos4_tmu_attributes, -}; - -static int __devinit exynos4_tmu_probe(struct platform_device *pdev) -{ - struct exynos4_tmu_data *data; - struct exynos4_tmu_platform_data *pdata = pdev->dev.platform_data; - int ret; - - if (!pdata) { - dev_err(&pdev->dev, "No platform init data supplied.\n"); - return -ENODEV; - } - - data = kzalloc(sizeof(struct exynos4_tmu_data), GFP_KERNEL); - if (!data) { - dev_err(&pdev->dev, "Failed to allocate driver structure\n"); - return -ENOMEM; - } - - data->irq = platform_get_irq(pdev, 0); - if (data->irq < 0) { - ret = data->irq; - dev_err(&pdev->dev, "Failed to get platform irq\n"); - goto err_free; - } - - INIT_WORK(&data->irq_work, exynos4_tmu_work); - - data->mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); - if (!data->mem) { - ret = -ENOENT; - dev_err(&pdev->dev, "Failed to get platform resource\n"); - goto err_free; - } - - data->mem = request_mem_region(data->mem->start, - resource_size(data->mem), pdev->name); - if (!data->mem) { - ret = -ENODEV; - dev_err(&pdev->dev, "Failed to request memory region\n"); - goto err_free; - } - - data->base = ioremap(data->mem->start, resource_size(data->mem)); - if (!data->base) { - ret = -ENODEV; - dev_err(&pdev->dev, "Failed to ioremap memory\n"); - goto err_mem_region; - } - - ret = request_irq(data->irq, exynos4_tmu_irq, - IRQF_TRIGGER_RISING, - "exynos4-tmu", data); - if (ret) { - dev_err(&pdev->dev, "Failed to request irq: %d\n", data->irq); - goto err_io_remap; - } - - data->clk = clk_get(NULL, "tmu_apbif"); - if (IS_ERR(data->clk)) { - ret = PTR_ERR(data->clk); - dev_err(&pdev->dev, "Failed to get clock\n"); - goto err_irq; - } - - data->pdata = pdata; - platform_set_drvdata(pdev, data); - mutex_init(&data->lock); - - ret = exynos4_tmu_initialize(pdev); - if (ret) { - dev_err(&pdev->dev, "Failed to initialize TMU\n"); - goto err_clk; - } - - ret = sysfs_create_group(&pdev->dev.kobj, &exynos4_tmu_attr_group); - if (ret) { - dev_err(&pdev->dev, "Failed to create sysfs group\n"); - goto err_clk; - } - - data->hwmon_dev = hwmon_device_register(&pdev->dev); - if (IS_ERR(data->hwmon_dev)) { - ret = PTR_ERR(data->hwmon_dev); - dev_err(&pdev->dev, "Failed to register hwmon device\n"); - goto err_create_group; - } - - exynos4_tmu_control(pdev, true); - - return 0; - -err_create_group: - sysfs_remove_group(&pdev->dev.kobj, &exynos4_tmu_attr_group); -err_clk: - platform_set_drvdata(pdev, NULL); - clk_put(data->clk); -err_irq: - free_irq(data->irq, data); -err_io_remap: - iounmap(data->base); -err_mem_region: - release_mem_region(data->mem->start, resource_size(data->mem)); -err_free: - kfree(data); - - return ret; -} - -static int __devexit exynos4_tmu_remove(struct platform_device *pdev) -{ - struct exynos4_tmu_data *data = platform_get_drvdata(pdev); - - exynos4_tmu_control(pdev, false); - - hwmon_device_unregister(data->hwmon_dev); - sysfs_remove_group(&pdev->dev.kobj, &exynos4_tmu_attr_group); - - clk_put(data->clk); - - free_irq(data->irq, data); - - iounmap(data->base); - release_mem_region(data->mem->start, resource_size(data->mem)); - - platform_set_drvdata(pdev, NULL); - - kfree(data); - - return 0; -} - -#ifdef CONFIG_PM -static int exynos4_tmu_suspend(struct platform_device *pdev, pm_message_t state) -{ - exynos4_tmu_control(pdev, false); - - return 0; -} - -static int exynos4_tmu_resume(struct platform_device *pdev) -{ - exynos4_tmu_initialize(pdev); - exynos4_tmu_control(pdev, true); - - return 0; -} -#else -#define exynos4_tmu_suspend NULL -#define exynos4_tmu_resume NULL -#endif - -static struct platform_driver exynos4_tmu_driver = { - .driver = { - .name = "exynos4-tmu", - .owner = THIS_MODULE, - }, - .probe = exynos4_tmu_probe, - .remove = __devexit_p(exynos4_tmu_remove), - .suspend = exynos4_tmu_suspend, - .resume = exynos4_tmu_resume, -}; - -module_platform_driver(exynos4_tmu_driver); - -MODULE_DESCRIPTION("EXYNOS4 TMU Driver"); -MODULE_AUTHOR("Donggeun Kim dg77.kim@samsung.com"); -MODULE_LICENSE("GPL"); -MODULE_ALIAS("platform:exynos4-tmu"); diff --git a/drivers/thermal/Kconfig b/drivers/thermal/Kconfig index 24c43e3..5c5a43c 100644 --- a/drivers/thermal/Kconfig +++ b/drivers/thermal/Kconfig @@ -29,3 +29,13 @@ config CPU_THERMAL This will be useful for platforms using the generic thermal interface and not the ACPI interface. If you want this support, you should say Y or M here. + +config SENSORS_EXYNOS4_TMU + tristate "Temperature sensor on Samsung EXYNOS4" + depends on ARCH_EXYNOS4 && THERMAL + help + If you say yes here you get support for TMU (Thermal Managment + Unit) on SAMSUNG EXYNOS4 series of SoC. + + This driver can also be built as a module. If so, the module + will be called exynos4-tmu. diff --git a/drivers/thermal/Makefile b/drivers/thermal/Makefile index 655cbc4..d2d01e9 100644 --- a/drivers/thermal/Makefile +++ b/drivers/thermal/Makefile @@ -4,3 +4,4 @@
obj-$(CONFIG_THERMAL) += thermal_sys.o obj-$(CONFIG_CPU_THERMAL) += cpu_cooling.o +obj-$(CONFIG_SENSORS_EXYNOS4_TMU) += exynos4_thermal.o diff --git a/drivers/thermal/exynos4_thermal.c b/drivers/thermal/exynos4_thermal.c new file mode 100644 index 0000000..ff708d5 --- /dev/null +++ b/drivers/thermal/exynos4_thermal.c @@ -0,0 +1,409 @@ +/* + * exynos4_thermal.c - Samsung EXYNOS4 TMU (Thermal Management Unit) + * + * Copyright (C) 2011 Samsung Electronics + * Donggeun Kim dg77.kim@samsung.com + * Amit Daniel Kachhap amit.kachhap@linaro.org + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + * + */ + +#include <linux/module.h> +#include <linux/err.h> +#include <linux/kernel.h> +#include <linux/slab.h> +#include <linux/platform_device.h> +#include <linux/interrupt.h> +#include <linux/clk.h> +#include <linux/workqueue.h> +#include <linux/sysfs.h> +#include <linux/kobject.h> +#include <linux/io.h> +#include <linux/mutex.h> + +#include <linux/platform_data/exynos4_tmu.h> + +#define EXYNOS4_TMU_REG_TRIMINFO 0x0 +#define EXYNOS4_TMU_REG_CONTROL 0x20 +#define EXYNOS4_TMU_REG_STATUS 0x28 +#define EXYNOS4_TMU_REG_CURRENT_TEMP 0x40 +#define EXYNOS4_TMU_REG_THRESHOLD_TEMP 0x44 +#define EXYNOS4_TMU_REG_TRIG_LEVEL0 0x50 +#define EXYNOS4_TMU_REG_TRIG_LEVEL1 0x54 +#define EXYNOS4_TMU_REG_TRIG_LEVEL2 0x58 +#define EXYNOS4_TMU_REG_TRIG_LEVEL3 0x5C +#define EXYNOS4_TMU_REG_PAST_TEMP0 0x60 +#define EXYNOS4_TMU_REG_PAST_TEMP1 0x64 +#define EXYNOS4_TMU_REG_PAST_TEMP2 0x68 +#define EXYNOS4_TMU_REG_PAST_TEMP3 0x6C +#define EXYNOS4_TMU_REG_INTEN 0x70 +#define EXYNOS4_TMU_REG_INTSTAT 0x74 +#define EXYNOS4_TMU_REG_INTCLEAR 0x78 + +#define EXYNOS4_TMU_GAIN_SHIFT 8 +#define EXYNOS4_TMU_REF_VOLTAGE_SHIFT 24 + +#define EXYNOS4_TMU_TRIM_TEMP_MASK 0xff +#define EXYNOS4_TMU_CORE_ON 3 +#define EXYNOS4_TMU_CORE_OFF 2 +#define EXYNOS4_TMU_DEF_CODE_TO_TEMP_OFFSET 50 +#define EXYNOS4_TMU_TRIG_LEVEL0_MASK 0x1 +#define EXYNOS4_TMU_TRIG_LEVEL1_MASK 0x10 +#define EXYNOS4_TMU_TRIG_LEVEL2_MASK 0x100 +#define EXYNOS4_TMU_TRIG_LEVEL3_MASK 0x1000 +#define EXYNOS4_TMU_INTCLEAR_VAL 0x1111 + +struct exynos4_tmu_data { + struct exynos4_tmu_platform_data *pdata; + struct resource *mem; + void __iomem *base; + int irq; + struct work_struct irq_work; + struct mutex lock; + struct clk *clk; + u8 temp_error1, temp_error2; +}; + +/* + * TMU treats temperature as a mapped temperature code. + * The temperature is converted differently depending on the calibration type. + */ +static int temp_to_code(struct exynos4_tmu_data *data, u8 temp) +{ + struct exynos4_tmu_platform_data *pdata = data->pdata; + int temp_code; + + /* temp should range between 25 and 125 */ + if (temp < 25 || temp > 125) { + temp_code = -EINVAL; + goto out; + } + + switch (pdata->cal_type) { + case TYPE_TWO_POINT_TRIMMING: + temp_code = (temp - 25) * + (data->temp_error2 - data->temp_error1) / + (85 - 25) + data->temp_error1; + break; + case TYPE_ONE_POINT_TRIMMING: + temp_code = temp + data->temp_error1 - 25; + break; + default: + temp_code = temp + EXYNOS4_TMU_DEF_CODE_TO_TEMP_OFFSET; + break; + } +out: + return temp_code; +} + +/* + * Calculate a temperature value from a temperature code. + * The unit of the temperature is degree Celsius. + */ +static int code_to_temp(struct exynos4_tmu_data *data, u8 temp_code) +{ + struct exynos4_tmu_platform_data *pdata = data->pdata; + int temp; + + /* temp_code should range between 75 and 175 */ + if (temp_code < 75 || temp_code > 175) { + temp = -ENODATA; + goto out; + } + + switch (pdata->cal_type) { + case TYPE_TWO_POINT_TRIMMING: + temp = (temp_code - data->temp_error1) * (85 - 25) / + (data->temp_error2 - data->temp_error1) + 25; + break; + case TYPE_ONE_POINT_TRIMMING: + temp = temp_code - data->temp_error1 + 25; + break; + default: + temp = temp_code - EXYNOS4_TMU_DEF_CODE_TO_TEMP_OFFSET; + break; + } +out: + return temp; +} + +static int exynos4_tmu_initialize(struct platform_device *pdev) +{ + struct exynos4_tmu_data *data = platform_get_drvdata(pdev); + struct exynos4_tmu_platform_data *pdata = data->pdata; + unsigned int status, trim_info; + int ret = 0, threshold_code; + + mutex_lock(&data->lock); + clk_enable(data->clk); + + status = readb(data->base + EXYNOS4_TMU_REG_STATUS); + if (!status) { + ret = -EBUSY; + goto out; + } + + /* Save trimming info in order to perform calibration */ + trim_info = readl(data->base + EXYNOS4_TMU_REG_TRIMINFO); + data->temp_error1 = trim_info & EXYNOS4_TMU_TRIM_TEMP_MASK; + data->temp_error2 = ((trim_info >> 8) & EXYNOS4_TMU_TRIM_TEMP_MASK); + + /* Write temperature code for threshold */ + threshold_code = temp_to_code(data, pdata->threshold); + if (threshold_code < 0) { + ret = threshold_code; + goto out; + } + writeb(threshold_code, + data->base + EXYNOS4_TMU_REG_THRESHOLD_TEMP); + + writeb(pdata->trigger_levels[0], + data->base + EXYNOS4_TMU_REG_TRIG_LEVEL0); + writeb(pdata->trigger_levels[1], + data->base + EXYNOS4_TMU_REG_TRIG_LEVEL1); + writeb(pdata->trigger_levels[2], + data->base + EXYNOS4_TMU_REG_TRIG_LEVEL2); + writeb(pdata->trigger_levels[3], + data->base + EXYNOS4_TMU_REG_TRIG_LEVEL3); + + writel(EXYNOS4_TMU_INTCLEAR_VAL, + data->base + EXYNOS4_TMU_REG_INTCLEAR); +out: + clk_disable(data->clk); + mutex_unlock(&data->lock); + + return ret; +} + +static void exynos4_tmu_control(struct platform_device *pdev, bool on) +{ + struct exynos4_tmu_data *data = platform_get_drvdata(pdev); + struct exynos4_tmu_platform_data *pdata = data->pdata; + unsigned int con, interrupt_en; + + mutex_lock(&data->lock); + clk_enable(data->clk); + + con = pdata->reference_voltage << EXYNOS4_TMU_REF_VOLTAGE_SHIFT | + pdata->gain << EXYNOS4_TMU_GAIN_SHIFT; + if (on) { + con |= EXYNOS4_TMU_CORE_ON; + interrupt_en = pdata->trigger_level3_en << 12 | + pdata->trigger_level2_en << 8 | + pdata->trigger_level1_en << 4 | + pdata->trigger_level0_en; + } else { + con |= EXYNOS4_TMU_CORE_OFF; + interrupt_en = 0; /* Disable all interrupts */ + } + writel(interrupt_en, data->base + EXYNOS4_TMU_REG_INTEN); + writel(con, data->base + EXYNOS4_TMU_REG_CONTROL); + + clk_disable(data->clk); + mutex_unlock(&data->lock); +} + +static int exynos4_tmu_read(struct exynos4_tmu_data *data) +{ + u8 temp_code; + int temp; + + mutex_lock(&data->lock); + clk_enable(data->clk); + + temp_code = readb(data->base + EXYNOS4_TMU_REG_CURRENT_TEMP); + temp = code_to_temp(data, temp_code); + + clk_disable(data->clk); + mutex_unlock(&data->lock); + + return temp; +} + +static void exynos4_tmu_work(struct work_struct *work) +{ + struct exynos4_tmu_data *data = container_of(work, + struct exynos4_tmu_data, irq_work); + + mutex_lock(&data->lock); + clk_enable(data->clk); + + writel(EXYNOS4_TMU_INTCLEAR_VAL, data->base + EXYNOS4_TMU_REG_INTCLEAR); + + enable_irq(data->irq); + + clk_disable(data->clk); + mutex_unlock(&data->lock); +} + +static irqreturn_t exynos4_tmu_irq(int irq, void *id) +{ + struct exynos4_tmu_data *data = id; + + disable_irq_nosync(irq); + schedule_work(&data->irq_work); + + return IRQ_HANDLED; +} + +static int __devinit exynos4_tmu_probe(struct platform_device *pdev) +{ + struct exynos4_tmu_data *data; + struct exynos4_tmu_platform_data *pdata = pdev->dev.platform_data; + int ret; + + if (!pdata) { + dev_err(&pdev->dev, "No platform init data supplied.\n"); + return -ENODEV; + } + + data = kzalloc(sizeof(struct exynos4_tmu_data), GFP_KERNEL); + if (!data) { + dev_err(&pdev->dev, "Failed to allocate driver structure\n"); + return -ENOMEM; + } + + data->irq = platform_get_irq(pdev, 0); + if (data->irq < 0) { + ret = data->irq; + dev_err(&pdev->dev, "Failed to get platform irq\n"); + goto err_free; + } + + INIT_WORK(&data->irq_work, exynos4_tmu_work); + + data->mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!data->mem) { + ret = -ENOENT; + dev_err(&pdev->dev, "Failed to get platform resource\n"); + goto err_free; + } + + data->mem = request_mem_region(data->mem->start, + resource_size(data->mem), pdev->name); + if (!data->mem) { + ret = -ENODEV; + dev_err(&pdev->dev, "Failed to request memory region\n"); + goto err_free; + } + + data->base = ioremap(data->mem->start, resource_size(data->mem)); + if (!data->base) { + ret = -ENODEV; + dev_err(&pdev->dev, "Failed to ioremap memory\n"); + goto err_mem_region; + } + + ret = request_irq(data->irq, exynos4_tmu_irq, + IRQF_TRIGGER_RISING, + "exynos4-tmu", data); + if (ret) { + dev_err(&pdev->dev, "Failed to request irq: %d\n", data->irq); + goto err_io_remap; + } + + data->clk = clk_get(NULL, "tmu_apbif"); + if (IS_ERR(data->clk)) { + ret = PTR_ERR(data->clk); + dev_err(&pdev->dev, "Failed to get clock\n"); + goto err_irq; + } + + data->pdata = pdata; + platform_set_drvdata(pdev, data); + mutex_init(&data->lock); + + ret = exynos4_tmu_initialize(pdev); + if (ret) { + dev_err(&pdev->dev, "Failed to initialize TMU\n"); + goto err_clk; + } + + exynos4_tmu_control(pdev, true); + + return 0; +err_clk: + platform_set_drvdata(pdev, NULL); + clk_put(data->clk); +err_irq: + free_irq(data->irq, data); +err_io_remap: + iounmap(data->base); +err_mem_region: + release_mem_region(data->mem->start, resource_size(data->mem)); +err_free: + kfree(data); + + return ret; +} + +static int __devexit exynos4_tmu_remove(struct platform_device *pdev) +{ + struct exynos4_tmu_data *data = platform_get_drvdata(pdev); + + exynos4_tmu_control(pdev, false); + + clk_put(data->clk); + + free_irq(data->irq, data); + + iounmap(data->base); + release_mem_region(data->mem->start, resource_size(data->mem)); + + platform_set_drvdata(pdev, NULL); + + kfree(data); + + return 0; +} + +#ifdef CONFIG_PM +static int exynos4_tmu_suspend(struct platform_device *pdev, pm_message_t state) +{ + exynos4_tmu_control(pdev, false); + + return 0; +} + +static int exynos4_tmu_resume(struct platform_device *pdev) +{ + exynos4_tmu_initialize(pdev); + exynos4_tmu_control(pdev, true); + + return 0; +} +#else +#define exynos4_tmu_suspend NULL +#define exynos4_tmu_resume NULL +#endif + +static struct platform_driver exynos4_tmu_driver = { + .driver = { + .name = "exynos4-tmu", + .owner = THIS_MODULE, + }, + .probe = exynos4_tmu_probe, + .remove = __devexit_p(exynos4_tmu_remove), + .suspend = exynos4_tmu_suspend, + .resume = exynos4_tmu_resume, +}; + +module_platform_driver(exynos4_tmu_driver); + +MODULE_DESCRIPTION("EXYNOS4 TMU Driver"); +MODULE_AUTHOR("Donggeun Kim dg77.kim@samsung.com"); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("platform:exynos4-tmu");