Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S935244Ab2JaJyN (ORCPT ); Wed, 31 Oct 2012 05:54:13 -0400 Received: from mailout3.samsung.com ([203.254.224.33]:52083 "EHLO mailout3.samsung.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751687Ab2JaJyI (ORCPT ); Wed, 31 Oct 2012 05:54:08 -0400 X-AuditID: cbfee61a-b7fa66d0000004cf-cf-5090f53d53f3 From: Jonghwa Lee To: linux-pm@vger.kernel.org Cc: linux-kernel@vger.kernel.org, Len Brown , Durgadoss R , "Rafael J. Wysocki" , Amit Dinel Kachhap , Jonghwa Lee Subject: [PATCH v3] Thermal: exynos: Add sysfs node supporting exynos's emulation mode. Date: Wed, 31 Oct 2012 18:53:57 +0900 Message-id: <1351677237-18240-1-git-send-email-jonghwa3.lee@samsung.com> X-Mailer: git-send-email 1.7.4.1 X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFjrPJMWRmVeSWpSXmKPExsVy+t9jAV3brxMCDFp/Cllc3jWHzeJz7xFG ByaPz5vkAhijuGxSUnMyy1KL9O0SuDJev9rNUnDCpmLaW8sGxtf6XYycHBICJhJTpz9lgbDF JC7cW8/WxcjFISSwiFHi6Z0VTBBOC5PEtNuXWUGq2AR0JP7vu8kOYosIyEhMvbKfFaSIWeAp o8T3VfMYQRLCApESzbsvg9ksAqoSm05PAGvmFfCQeLDgPiPEOgWJBffesk1g5F7AyLCKUTS1 ILmgOCk911CvODG3uDQvXS85P3cTI9ibz6R2MK5ssDjEKMDBqMTDa/ivP0CINbGsuDL3EKME B7OSCG/ypwkBQrwpiZVVqUX58UWlOanFhxilOViUxHmbPVIChATSE0tSs1NTC1KLYLJMHJxS DYzpKg3euUzXTH8cDZtbIf2EM7y3/JmGEf9NWZbvEj/LdwgpPZrKUxETFTL/q8W96ll7TjDt u82cnnezuih27cqdKh9tZuUVN385llip8nObkaVoLVffVFuG5OWPTm7VaGZYWL3rWVd+YvVp D8mTq+4fzI9RmhqjYhx1553m3zeylVNfivf4KiuxFGckGmoxFxUnAgB3lOAA4gEAAA== Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 7769 Lines: 233 This patch supports exynos's emulation mode with newly created sysfs node. Exynos 4x12 (4212, 4412) and 5 series provide emulation mode for thermal management unit. Thermal emulation mode supports software debug for TMU's operation. User can set temperature manually with software code and TMU will read current temperature from user value not from sensor's value. This patch includes also documentary placed under Documentation/thermal/. Signed-off-by: Jonghwa Lee --- v2 exynos_thermal.c - Fix build error occured by wrong emulation control register name. - Remove exynos5410 dependent codes. exynos_thermal_emulation - Align indentation. v3 - Remove unnecessay variables. - Do some code clean in exynos_tmu_emulation_store(). - Make wrapping function of sysfs node creation function to use #ifdefs in minimum. Documentation/thermal/exynos_thermal_emulation | 49 +++++++++++++ drivers/thermal/Kconfig | 9 +++ drivers/thermal/exynos_thermal.c | 93 ++++++++++++++++++++++++ 3 files changed, 151 insertions(+), 0 deletions(-) create mode 100644 Documentation/thermal/exynos_thermal_emulation diff --git a/Documentation/thermal/exynos_thermal_emulation b/Documentation/thermal/exynos_thermal_emulation new file mode 100644 index 0000000..062d867 --- /dev/null +++ b/Documentation/thermal/exynos_thermal_emulation @@ -0,0 +1,49 @@ +EXYNOS EMULATION MODE +======================== + +Copyright (C) 2012 Samsung Electronics + +Writen by Jonghwa Lee + +Description +----------- + +Exynos 4x12 (4212, 4412) and 5 series provide emulation mode for thermal management unit. +Thermal emulation mode supports software debug for TMU's operation. User can set temperature +manually with software code and TMU will read current temperature from user value not from +sensor's value. + +Enabling CONFIG_EXYNOS_THERMAL_EMUL option will make this support in available. +When it's enabled, sysfs node will be created under +/sys/bus/platform/devices/'exynos device name'/ with name of 'emulation'. + +The sysfs node, 'emulation', will contain value 0 for the initial state. When you input any +temperature you want to update to sysfs node, it automatically enable emulation mode and +current temperature will be changed into it. +(Exynos also supports user changable delay time which would be used to delay of + changing temperature. However, this node only uses same delay of real sensing time, 938us.) + +Disabling emulation mode only requires writing value 0 to sysfs node. + + +TEMP 120 | + | + 100 | + | + 80 | + | +----------- + 60 | | | + | +-------------| | + 40 | | | | + | | | | + 20 | | | +---------- + | | | | | + 0 |______________|_____________|__________|__________|_________ + A A A A TIME + |<----->| |<----->| |<----->| | + | 938us | | | | | | +emulation : 0 50 | 70 | 20 | 0 +current temp : sensor 50 70 20 sensor + + + diff --git a/drivers/thermal/Kconfig b/drivers/thermal/Kconfig index e1cb6bd..c02a66c 100644 --- a/drivers/thermal/Kconfig +++ b/drivers/thermal/Kconfig @@ -55,3 +55,12 @@ config EXYNOS_THERMAL help If you say yes here you get support for TMU (Thermal Managment Unit) on SAMSUNG EXYNOS series of SoC. + +config EXYNOS_THERMAL_EMUL + bool "EXYNOS TMU emulation mode support" + depends on !CPU_EXYNOS4210 && EXYNOS_THERMAL + help + Exynos 4412 and 4414 and 5 series has emulation mode on TMU. + Enable this option will be make sysfs node in exynos thermal platform + device directory to support emulation mode. With emulation mode sysfs + node, you can manually input temperature to TMU for simulation purpose. diff --git a/drivers/thermal/exynos_thermal.c b/drivers/thermal/exynos_thermal.c index fd03e85..4bdd1eb 100644 --- a/drivers/thermal/exynos_thermal.c +++ b/drivers/thermal/exynos_thermal.c @@ -99,6 +99,14 @@ #define IDLE_INTERVAL 10000 #define MCELSIUS 1000 +#ifdef CONFIG_EXYNOS_THERMAL_EMUL +#define EXYNOS_EMUL_TIME 0x57F0 +#define EXYNOS_EMUL_TIME_SHIFT 16 +#define EXYNOS_EMUL_DATA_SHIFT 8 +#define EXYNOS_EMUL_DATA_MASK 0xFF +#define EXYNOS_EMUL_ENABLE 0x1 +#endif /* CONFIG_EXYNOS_THERMAL_EMUL */ + /* CPU Zone information */ #define PANIC_ZONE 4 #define WARN_ZONE 3 @@ -832,6 +840,84 @@ static inline struct exynos_tmu_platform_data *exynos_get_driver_data( return (struct exynos_tmu_platform_data *) platform_get_device_id(pdev)->driver_data; } + +#ifdef CONFIG_EXYNOS_THERMAL_EMUL +static ssize_t exynos_tmu_emulation_show(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct platform_device *pdev = container_of(dev, + struct platform_device, dev); + struct exynos_tmu_data *data = platform_get_drvdata(pdev); + unsigned int reg; + u8 temp_code; + int temp = 0; + + mutex_lock(&data->lock); + clk_enable(data->clk); + reg = readl(data->base + EXYNOS_EMUL_CON); + clk_disable(data->clk); + mutex_unlock(&data->lock); + + if (reg & EXYNOS_EMUL_ENABLE) { + reg >>= EXYNOS_EMUL_DATA_SHIFT; + temp_code = reg & EXYNOS_EMUL_DATA_MASK; + temp = code_to_temp(data, temp_code); + } else { + temp = 0; + } + + return sprintf(buf, "%d\n", temp); +} + +static ssize_t exynos_tmu_emulation_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + struct platform_device *pdev = container_of(dev, + struct platform_device, dev); + struct exynos_tmu_data *data = platform_get_drvdata(pdev); + unsigned int reg; + int temp = 0; + + if (!sscanf(buf, "%d\n", &temp) || temp < 0) + return -EINVAL; + + mutex_lock(&data->lock); + clk_enable(data->clk); + + reg = readl(data->base + EXYNOS_EMUL_CON); + + if (temp) + reg = (EXYNOS_EMUL_TIME << EXYNOS_EMUL_TIME_SHIFT) | + (temp_to_code(data, temp) << EXYNOS_EMUL_DATA_SHIFT) | + EXYNOS_EMUL_ENABLE; + else + reg &= ~EXYNOS_EMUL_ENABLE; + + writel(reg, data->base + EXYNOS_EMUL_CON); + + clk_disable(data->clk); + mutex_unlock(&data->lock); + + return count; +} + +static DEVICE_ATTR(emulation, 0644, exynos_tmu_emulation_show, + exynos_tmu_emulation_store); +static int create_emulation_sysfs(struct device *dev) +{ + return device_create_file(dev, &dev_attr_emulation); +} +static void remove_emulation_sysfs(struct device *dev) +{ + device_remove_file(dev, &dev_attr_emulation); +} +#else +static inline int create_emulation_sysfs(struct device *dev) {return 0;} +static inline void remove_emulation_sysfs(struct device *dev){} +#endif + static int __devinit exynos_tmu_probe(struct platform_device *pdev) { struct exynos_tmu_data *data; @@ -930,6 +1016,11 @@ static int __devinit exynos_tmu_probe(struct platform_device *pdev) dev_err(&pdev->dev, "Failed to register thermal interface\n"); goto err_clk; } + + ret = create_emulation_sysfs(&pdev->dev); + if (ret) + dev_err(&pdev->dev, "Faield to create emulation mode sysfs node\n"); + return 0; err_clk: platform_set_drvdata(pdev, NULL); @@ -941,6 +1032,8 @@ static int __devexit exynos_tmu_remove(struct platform_device *pdev) { struct exynos_tmu_data *data = platform_get_drvdata(pdev); + remove_emulation_sysfs(&pdev->dev); + exynos_tmu_control(pdev, false); exynos_unregister_thermal(); -- 1.7.4.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/