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Date: Fri, 2 Nov 2012 05:13:32 +0000
From: "R, Durgadoss" <durgadoss.r@...el.com>
To: Jonghwa Lee <jonghwa3.lee@...sung.com>,
"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>
CC: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"Brown, Len" <len.brown@...el.com>,
"Rafael J. Wysocki" <rjw@...k.pl>,
Amit Dinel Kachhap <amit.kachhap@...aro.org>,
MyungJoo Ham <myungjoo.ham@...sung.com>,
Kyungmin Park <kyungmin.park@...sung.com>,
"Zhang, Rui" <rui.zhang@...el.com>
Subject: RE: [PATCH v4] Thermal: exynos: Add sysfs node supporting exynos's
emulation mode.
Hi Lee,
> -----Original Message-----
> From: Jonghwa Lee [mailto:jonghwa3.lee@...sung.com]
> Sent: Friday, November 02, 2012 7:55 AM
> To: linux-pm@...r.kernel.org
> Cc: linux-kernel@...r.kernel.org; Brown, Len; R, Durgadoss; Rafael J.
> Wysocki; Amit Dinel Kachhap; MyungJoo Ham; Kyungmin Park; Jonghwa Lee
> Subject: [PATCH v4] Thermal: exynos: Add sysfs node supporting exynos's
> emulation mode.
>
> 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/.
>
Thanks for fixing the comments.
Please CC linux-acpi, when you submit thermal patches, going forward.
I am CCing Rui for now, for him to review/merge this patch.
Reviewed-by: Durgadoss R <durgadoss.r@...el.com>
Thanks,
Durga
> Signed-off-by: Jonghwa Lee <jonghwa3.lee@...sung.com>
> ---
> v4
> - Fix Typo.
> - Remove unnecessary codes.
> - Add comments about feature of exynos emulation operation to the
> document.
>
> 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.
>
> v2
> exynos_thermal.c
> - Fix build error occured by wrong emulation control register name.
> - Remove exynos5410 dependent codes.
> exynos_thermal_emulation
> - Align indentation.
>
> Documentation/thermal/exynos_thermal_emulation | 56
> +++++++++++++++
> drivers/thermal/Kconfig | 9 +++
> drivers/thermal/exynos_thermal.c | 91
> ++++++++++++++++++++++++
> 3 files changed, 156 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..a6ea06f
> --- /dev/null
> +++ b/Documentation/thermal/exynos_thermal_emulation
> @@ -0,0 +1,56 @@
> +EXYNOS EMULATION MODE
> +========================
> +
> +Copyright (C) 2012 Samsung Electronics
> +
> +Written by Jonghwa Lee <jonghwa3.lee@...sung.com>
> +
> +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.)
> +
> +Exynos emulation mode requires synchronous of value changing and
> enabling. It means when you
> +want to update the any value of delay or next temperature, then you have
> to enable emulation
> +mode at the same time. (Or you have to keep the mode enabling.) If you
> don't, it fails to
> +change the value to updated one and just use last succeessful value
> repeatedly. That's why
> +this node gives users the right to change termerpature only. Just one
> interface makes it more
> +simply to use.
> +
> +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..eebd4e5 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 +840,82 @@ 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);
> + }
> +
> + 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;
> +
> + 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 +1014,11 @@ 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, "Failed to create emulation mode
> sysfs node\n");
> +
> return 0;
> err_clk:
> platform_set_drvdata(pdev, NULL);
> @@ -941,6 +1030,8 @@ 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
--
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