From mboxrd@z Thu Jan 1 00:00:00 1970 From: Shawn Guo Subject: Re: [PATCH] thermal: add imx thermal driver support Date: Thu, 13 Jun 2013 08:16:38 +0800 Message-ID: <20130613001636.GA14087@S2101-09.ap.freescale.net> References: <1370330008-5982-1-git-send-email-shawn.guo@linaro.org> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Content-Disposition: inline In-Reply-To: <1370330008-5982-1-git-send-email-shawn.guo@linaro.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=m.gmane.org@lists.infradead.org To: Zhang Rui Cc: Eduardo Valentin , linux-arm-kernel@lists.infradead.org, linux-pm@vger.kernel.org List-Id: linux-pm@vger.kernel.org On Tue, Jun 04, 2013 at 03:13:28PM +0800, Shawn Guo wrote: > This is based on the initial imx thermal work done by > Rob Lee (Not sure if the email address is still > valid). Since he is no longer interested in the work and I have > rewritten a significant amount of the code, I just took the authorship > over from him. > > It adds the imx thermal support using Temperature Monitor (TEMPMON) > block found on some Freescale i.MX SoCs. The driver uses syscon regmap > interface to access TEMPMON control registers and calibration data, and > supports cpufreq as the cooling device. > > Signed-off-by: Shawn Guo Hi Rui, Do you have you any comment on this patch? Shawn > --- > .../devicetree/bindings/thermal/imx-thermal.txt | 14 + > drivers/thermal/Kconfig | 8 + > drivers/thermal/Makefile | 1 + > drivers/thermal/imx_thermal.c | 421 ++++++++++++++++++++ > 4 files changed, 444 insertions(+) > create mode 100644 Documentation/devicetree/bindings/thermal/imx-thermal.txt > create mode 100644 drivers/thermal/imx_thermal.c > > diff --git a/Documentation/devicetree/bindings/thermal/imx-thermal.txt b/Documentation/devicetree/bindings/thermal/imx-thermal.txt > new file mode 100644 > index 0000000..c606e2b > --- /dev/null > +++ b/Documentation/devicetree/bindings/thermal/imx-thermal.txt > @@ -0,0 +1,14 @@ > +* Temperature Monitor (TEMPMON) on Freescale i.MX SoCs > + > +Required properties: > +- compatible : "fsl,imx6q-thermal" > +- fsl,tempmon : phandle pointer to TEMPMON control registers > +- fsl,tempmon-data : phandle pointer to TEMPMON calibration data > + > +Example: > + > +tempmon { > + compatible = "fsl,imx6q-tempmon"; > + fsl,tempmon = <&anatop>; > + fsl,tempmon-data = <&ocotp>; > +}; > diff --git a/drivers/thermal/Kconfig b/drivers/thermal/Kconfig > index 5e3c025..935fcbe 100644 > --- a/drivers/thermal/Kconfig > +++ b/drivers/thermal/Kconfig > @@ -91,6 +91,14 @@ config THERMAL_EMULATION > because userland can easily disable the thermal policy by simply > flooding this sysfs node with low temperature values. > > +config IMX_THERMAL > + tristate "Temperature sensor driver for Freescale i.MX SoCs" > + depends on CPU_THERMAL > + depends on MFD_SYSCON > + depends on OF > + help > + Support for Temperature Monitor (TEMPMON) found on Freescale i.MX SoCs. > + > config SPEAR_THERMAL > bool "SPEAr thermal sensor driver" > depends on PLAT_SPEAR > diff --git a/drivers/thermal/Makefile b/drivers/thermal/Makefile > index c054d41..6910b2d 100644 > --- a/drivers/thermal/Makefile > +++ b/drivers/thermal/Makefile > @@ -21,6 +21,7 @@ obj-$(CONFIG_EXYNOS_THERMAL) += exynos_thermal.o > obj-$(CONFIG_DOVE_THERMAL) += dove_thermal.o > obj-$(CONFIG_DB8500_THERMAL) += db8500_thermal.o > obj-$(CONFIG_ARMADA_THERMAL) += armada_thermal.o > +obj-$(CONFIG_IMX_THERMAL) += imx_thermal.o > obj-$(CONFIG_DB8500_CPUFREQ_COOLING) += db8500_cpufreq_cooling.o > obj-$(CONFIG_INTEL_POWERCLAMP) += intel_powerclamp.o > > diff --git a/drivers/thermal/imx_thermal.c b/drivers/thermal/imx_thermal.c > new file mode 100644 > index 0000000..bdfcadb > --- /dev/null > +++ b/drivers/thermal/imx_thermal.c > @@ -0,0 +1,421 @@ > +/* > + * Copyright 2013 Freescale Semiconductor, Inc. > + * > + * 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. > + * > + */ > + > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > + > +#define REG_SET 0x4 > +#define REG_CLR 0x8 > +#define REG_TOG 0xc > + > +#define MISC0 0x0150 > +#define MISC0_REFTOP_SELBIASOFF (1 << 3) > + > +#define TEMPSENSE0 0x0180 > +#define TEMPSENSE0_TEMP_CNT_SHIFT 8 > +#define TEMPSENSE0_TEMP_CNT_MASK (0xfff << TEMPSENSE0_TEMP_CNT_SHIFT) > +#define TEMPSENSE0_FINISHED (1 << 2) > +#define TEMPSENSE0_MEASURE_TEMP (1 << 1) > +#define TEMPSENSE0_POWER_DOWN (1 << 0) > + > +#define TEMPSENSE1 0x0190 > +#define TEMPSENSE1_MEASURE_FREQ 0xffff > + > +#define OCOTP_ANA1 0x04e0 > + > +/* The driver supports 1 active trip point and 1 critical trip point */ > +enum imx_thermal_trip { > + IMX_TRIP_ACTIVE, > + IMX_TRIP_CRITICAL, > + IMX_TRIP_NUM, > +}; > + > +/* > + * It defines the temperature in millicelsius for active trip point > + * that will trigger cooling action when crossed. > + */ > +#define IMX_TEMP_ACTIVE 85000 > + > +/* > + * The maximum die temperature on imx parts is 105C, let's give some cushion > + * for noise and possible temperature rise between measurements. > + */ > +#define IMX_TEMP_CRITICAL 100000 > + > +#define IMX_THERMAL_POLLING_INTERVAL 1000 /* millisecond */ > + > +struct imx_thermal_data { > + struct thermal_zone_device *tz; > + struct thermal_cooling_device *cdev; > + enum thermal_device_mode mode; > + struct regmap *tempmon; > + bool meas_suspended; > + int c1, c2; /* See forumla in imx_get_sensor_data() */ > +}; > + > +static int imx_get_temp(struct thermal_zone_device *tz, unsigned long *temp) > +{ > + struct imx_thermal_data *data = tz->devdata; > + struct regmap *map = data->tempmon; > + static unsigned long last_temp; > + unsigned int n_meas; > + u32 val; > + > + /* > + * Every time we measure the temperature, we will power on the > + * temperature sensor, enable measurements, take a reading, > + * disable measurements, power off the temperature sensor. > + */ > + regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_POWER_DOWN); > + regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_MEASURE_TEMP); > + > + /* > + * According to the temp sensor designers, it may require up to ~17us > + * to complete a measurement. But this timing isn't checked on every > + * part nor is it specified in the datasheet, so sleeping at least 1ms > + * should provide plenty of time. Sleeping longer than 1ms is ok so no > + * need for usleep_range. > + */ > + msleep(1); > + > + regmap_read(map, TEMPSENSE0, &val); > + regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_MEASURE_TEMP); > + regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_POWER_DOWN); > + > + if ((val & TEMPSENSE0_FINISHED) == 0) { > + dev_dbg(&tz->device, "temp measurement never finished\n"); > + return -EAGAIN; > + } > + > + n_meas = (val & TEMPSENSE0_TEMP_CNT_MASK) >> TEMPSENSE0_TEMP_CNT_SHIFT; > + > + /* See imx_get_sensor_data() for forumla derivation */ > + *temp = data->c2 + data->c1 * n_meas; > + > + if (*temp != last_temp) { > + dev_dbg(&tz->device, "millicelsius: %ld\n", *temp); > + last_temp = *temp; > + } > + > + return 0; > +} > + > +static int imx_get_mode(struct thermal_zone_device *tz, > + enum thermal_device_mode *mode) > +{ > + struct imx_thermal_data *data = tz->devdata; > + > + *mode = data->mode; > + > + return 0; > +} > + > +static int imx_set_mode(struct thermal_zone_device *tz, > + enum thermal_device_mode mode) > +{ > + struct imx_thermal_data *data = tz->devdata; > + > + tz->polling_delay = (mode == THERMAL_DEVICE_ENABLED) ? > + IMX_THERMAL_POLLING_INTERVAL : 0; > + data->mode = mode; > + thermal_zone_device_update(tz); > + > + return 0; > +} > + > +static int imx_get_trip_type(struct thermal_zone_device *tz, int trip, > + enum thermal_trip_type *type) > +{ > + *type = (trip == IMX_TRIP_ACTIVE) ? THERMAL_TRIP_ACTIVE : > + THERMAL_TRIP_CRITICAL; > + return 0; > +} > + > +static int imx_get_crit_temp(struct thermal_zone_device *tz, > + unsigned long *temp) > +{ > + *temp = IMX_TEMP_CRITICAL; > + return 0; > +} > + > +static int imx_get_trip_temp(struct thermal_zone_device *tz, int trip, > + unsigned long *temp) > +{ > + *temp = (trip == IMX_TRIP_ACTIVE) ? IMX_TEMP_ACTIVE : > + IMX_TEMP_CRITICAL; > + return 0; > +} > + > +static int imx_bind(struct thermal_zone_device *tz, > + struct thermal_cooling_device *cdev) > +{ > + int ret; > + > + ret = thermal_zone_bind_cooling_device(tz, IMX_TRIP_ACTIVE, cdev, > + THERMAL_NO_LIMIT, > + THERMAL_NO_LIMIT); > + if (ret) { > + dev_err(&tz->device, > + "binding zone %s with cdev %s failed:%d\n", > + tz->type, cdev->type, ret); > + return ret; > + } > + > + return 0; > +} > + > +static int imx_unbind(struct thermal_zone_device *tz, > + struct thermal_cooling_device *cdev) > +{ > + int ret; > + > + ret = thermal_zone_unbind_cooling_device(tz, IMX_TRIP_ACTIVE, cdev); > + if (ret) { > + dev_err(&tz->device, > + "unbinding zone %s with cdev %s failed:%d\n", > + tz->type, cdev->type, ret); > + return ret; > + } > + > + return 0; > +} > + > +static const struct thermal_zone_device_ops imx_tz_ops = { > + .bind = imx_bind, > + .unbind = imx_unbind, > + .get_temp = imx_get_temp, > + .get_mode = imx_get_mode, > + .set_mode = imx_set_mode, > + .get_trip_type = imx_get_trip_type, > + .get_trip_temp = imx_get_trip_temp, > + .get_crit_temp = imx_get_crit_temp, > +}; > + > +static int imx_get_sensor_data(struct platform_device *pdev) > +{ > + struct imx_thermal_data *data = platform_get_drvdata(pdev); > + struct regmap *map; > + int t1, t2, n1, n2; > + int ret; > + u32 val; > + > + map = syscon_regmap_lookup_by_phandle(pdev->dev.of_node, > + "fsl,tempmon-data"); > + if (IS_ERR(map)) { > + ret = PTR_ERR(map); > + dev_err(&pdev->dev, "failed to get sensor regmap: %d\n", ret); > + return ret; > + } > + > + ret = regmap_read(map, OCOTP_ANA1, &val); > + if (ret) { > + dev_err(&pdev->dev, "failed to read sensor data: %d\n", ret); > + return ret; > + } > + > + if (val == 0 || val == ~0) { > + dev_err(&pdev->dev, "invalid sensor calibration data\n"); > + return -EINVAL; > + } > + > + /* > + * Sensor data layout: > + * [31:20] - sensor value @ 25C > + * [19:8] - sensor value of hot > + * [7:0] - hot temperature value > + */ > + n1 = val >> 20; > + n2 = (val & 0xfff00) >> 8; > + t2 = val & 0xff; > + t1 = 25; /* t1 always 25C */ > + > + /* > + * Derived from linear interpolation, > + * Tmeas = T2 + (Nmeas - N2) * (T1 - T2) / (N1 - N2) > + * We want to reduce this down to the minimum computation necessary > + * for each temperature read. Also, we want Tmeas in millicelsius > + * and we don't want to lose precision from integer division. So... > + * milli_Tmeas = 1000 * T2 + 1000 * (Nmeas - N2) * (T1 - T2) / (N1 - N2) > + * Let constant c1 = 1000 * (T1 - T2) / (N1 - N2) > + * milli_Tmeas = (1000 * T2) + c1 * (Nmeas - N2) > + * milli_Tmeas = (1000 * T2) + (c1 * Nmeas) - (c1 * N2) > + * Let constant c2 = (1000 * T2) - (c1 * N2) > + * milli_Tmeas = c2 + (c1 * Nmeas) > + */ > + data->c1 = 1000 * (t1 - t2) / (n1 - n2); > + data->c2 = 1000 * t2 - data->c1 * n2; > + > + return 0; > +} > + > +static int imx_thermal_probe(struct platform_device *pdev) > +{ > + struct imx_thermal_data *data; > + struct cpumask clip_cpus; > + struct regmap *map; > + int ret; > + > + data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL); > + if (!data) > + return -ENOMEM; > + > + map = syscon_regmap_lookup_by_phandle(pdev->dev.of_node, "fsl,tempmon"); > + if (IS_ERR(map)) { > + ret = PTR_ERR(map); > + dev_err(&pdev->dev, "failed to get tempmon regmap: %d\n", ret); > + return ret; > + } > + data->tempmon = map; > + > + platform_set_drvdata(pdev, data); > + > + ret = imx_get_sensor_data(pdev); > + if (ret) { > + dev_err(&pdev->dev, "failed to get sensor data\n"); > + return ret; > + } > + > + /* Make sure sensor is in known good state for measurements */ > + regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_POWER_DOWN); > + regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_MEASURE_TEMP); > + regmap_write(map, TEMPSENSE1 + REG_CLR, TEMPSENSE1_MEASURE_FREQ); > + regmap_write(map, MISC0 + REG_SET, MISC0_REFTOP_SELBIASOFF); > + regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_POWER_DOWN); > + > + cpumask_set_cpu(0, &clip_cpus); > + data->cdev = cpufreq_cooling_register(&clip_cpus); > + if (IS_ERR(data->cdev)) { > + ret = PTR_ERR(data->cdev); > + dev_err(&pdev->dev, > + "failed to register cpufreq cooling device: %d\n", ret); > + return ret; > + } > + > + data->tz = thermal_zone_device_register("imx_thermal_zone", > + IMX_TRIP_NUM, 0, data, > + &imx_tz_ops, NULL, 0, > + IMX_THERMAL_POLLING_INTERVAL); > + if (IS_ERR(data->tz)) { > + ret = PTR_ERR(data->tz); > + dev_err(&pdev->dev, > + "failed to register thermal zone device %d\n", ret); > + cpufreq_cooling_unregister(data->cdev); > + return ret; > + } > + > + data->mode = THERMAL_DEVICE_ENABLED; > + > + return 0; > +} > + > +static int imx_thermal_remove(struct platform_device *pdev) > +{ > + struct imx_thermal_data *data = platform_get_drvdata(pdev); > + > + thermal_zone_device_unregister(data->tz); > + cpufreq_cooling_unregister(data->cdev); > + > + return 0; > +} > + > +#ifdef CONFIG_PM_SLEEP > +static int imx_thermal_suspend(struct device *dev) > +{ > + struct imx_thermal_data *data = dev_get_drvdata(dev); > + struct regmap *map = data->tempmon; > + u32 val; > + > + regmap_read(map, TEMPSENSE0, &val); > + > + /* Was a measurement taking place? If not, nothing to do. */ > + if (val & TEMPSENSE0_POWER_DOWN) > + return 0; > + > + regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_MEASURE_TEMP); > + regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_POWER_DOWN); > + > + data->meas_suspended = true; > + > + return 0; > +} > + > +static int imx_thermal_resume(struct device *dev) > +{ > + struct imx_thermal_data *data = dev_get_drvdata(dev); > + struct regmap *map = data->tempmon; > + > + /* > + * If a measurement was taking place while suspend, re-take the > + * measurement. > + */ > + if (data->meas_suspended) { > + regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_POWER_DOWN); > + regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_MEASURE_TEMP); > + /* > + * According to the temp sensor designers, it may require > + * up to ~17us to complete a measurement. But this timing > + * isn't checked on every part nor is it specified in the > + * datasheet, so delay 50us for timing margin. > + */ > + udelay(50); > + data->meas_suspended = false; > + } > + > + return 0; > +} > +#endif > + > +static SIMPLE_DEV_PM_OPS(imx_thermal_pm_ops, > + imx_thermal_suspend, imx_thermal_resume); > + > +static const struct of_device_id of_imx_thermal_match[] = { > + { .compatible = "fsl,imx6q-tempmon", }, > + { /* end */ } > +}; > + > +static struct platform_driver imx_thermal = { > + .driver = { > + .name = "imx_thermal", > + .owner = THIS_MODULE, > + .pm = &imx_thermal_pm_ops, > + .of_match_table = of_imx_thermal_match, > + }, > + .probe = imx_thermal_probe, > + .remove = imx_thermal_remove, > +}; > + > +static int __init imx_thermal_init(void) > +{ > + return platform_driver_register(&imx_thermal); > +} > +late_initcall(imx_thermal_init); > + > +static void __exit imx_thermal_exit(void) > +{ > + platform_driver_unregister(&imx_thermal); > +} > +module_exit(imx_thermal_exit); > + > +MODULE_AUTHOR("Freescale Semiconductor, Inc."); > +MODULE_DESCRIPTION("Thermal driver for Freescale i.MX SoCs"); > +MODULE_LICENSE("GPL"); > +MODULE_ALIAS("platform:imx-thermal"); > -- > 1.7.9.5 > > From mboxrd@z Thu Jan 1 00:00:00 1970 From: shawn.guo@linaro.org (Shawn Guo) Date: Thu, 13 Jun 2013 08:16:38 +0800 Subject: [PATCH] thermal: add imx thermal driver support In-Reply-To: <1370330008-5982-1-git-send-email-shawn.guo@linaro.org> References: <1370330008-5982-1-git-send-email-shawn.guo@linaro.org> Message-ID: <20130613001636.GA14087@S2101-09.ap.freescale.net> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org On Tue, Jun 04, 2013 at 03:13:28PM +0800, Shawn Guo wrote: > This is based on the initial imx thermal work done by > Rob Lee (Not sure if the email address is still > valid). Since he is no longer interested in the work and I have > rewritten a significant amount of the code, I just took the authorship > over from him. > > It adds the imx thermal support using Temperature Monitor (TEMPMON) > block found on some Freescale i.MX SoCs. The driver uses syscon regmap > interface to access TEMPMON control registers and calibration data, and > supports cpufreq as the cooling device. > > Signed-off-by: Shawn Guo Hi Rui, Do you have you any comment on this patch? Shawn > --- > .../devicetree/bindings/thermal/imx-thermal.txt | 14 + > drivers/thermal/Kconfig | 8 + > drivers/thermal/Makefile | 1 + > drivers/thermal/imx_thermal.c | 421 ++++++++++++++++++++ > 4 files changed, 444 insertions(+) > create mode 100644 Documentation/devicetree/bindings/thermal/imx-thermal.txt > create mode 100644 drivers/thermal/imx_thermal.c > > diff --git a/Documentation/devicetree/bindings/thermal/imx-thermal.txt b/Documentation/devicetree/bindings/thermal/imx-thermal.txt > new file mode 100644 > index 0000000..c606e2b > --- /dev/null > +++ b/Documentation/devicetree/bindings/thermal/imx-thermal.txt > @@ -0,0 +1,14 @@ > +* Temperature Monitor (TEMPMON) on Freescale i.MX SoCs > + > +Required properties: > +- compatible : "fsl,imx6q-thermal" > +- fsl,tempmon : phandle pointer to TEMPMON control registers > +- fsl,tempmon-data : phandle pointer to TEMPMON calibration data > + > +Example: > + > +tempmon { > + compatible = "fsl,imx6q-tempmon"; > + fsl,tempmon = <&anatop>; > + fsl,tempmon-data = <&ocotp>; > +}; > diff --git a/drivers/thermal/Kconfig b/drivers/thermal/Kconfig > index 5e3c025..935fcbe 100644 > --- a/drivers/thermal/Kconfig > +++ b/drivers/thermal/Kconfig > @@ -91,6 +91,14 @@ config THERMAL_EMULATION > because userland can easily disable the thermal policy by simply > flooding this sysfs node with low temperature values. > > +config IMX_THERMAL > + tristate "Temperature sensor driver for Freescale i.MX SoCs" > + depends on CPU_THERMAL > + depends on MFD_SYSCON > + depends on OF > + help > + Support for Temperature Monitor (TEMPMON) found on Freescale i.MX SoCs. > + > config SPEAR_THERMAL > bool "SPEAr thermal sensor driver" > depends on PLAT_SPEAR > diff --git a/drivers/thermal/Makefile b/drivers/thermal/Makefile > index c054d41..6910b2d 100644 > --- a/drivers/thermal/Makefile > +++ b/drivers/thermal/Makefile > @@ -21,6 +21,7 @@ obj-$(CONFIG_EXYNOS_THERMAL) += exynos_thermal.o > obj-$(CONFIG_DOVE_THERMAL) += dove_thermal.o > obj-$(CONFIG_DB8500_THERMAL) += db8500_thermal.o > obj-$(CONFIG_ARMADA_THERMAL) += armada_thermal.o > +obj-$(CONFIG_IMX_THERMAL) += imx_thermal.o > obj-$(CONFIG_DB8500_CPUFREQ_COOLING) += db8500_cpufreq_cooling.o > obj-$(CONFIG_INTEL_POWERCLAMP) += intel_powerclamp.o > > diff --git a/drivers/thermal/imx_thermal.c b/drivers/thermal/imx_thermal.c > new file mode 100644 > index 0000000..bdfcadb > --- /dev/null > +++ b/drivers/thermal/imx_thermal.c > @@ -0,0 +1,421 @@ > +/* > + * Copyright 2013 Freescale Semiconductor, Inc. > + * > + * 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. > + * > + */ > + > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > + > +#define REG_SET 0x4 > +#define REG_CLR 0x8 > +#define REG_TOG 0xc > + > +#define MISC0 0x0150 > +#define MISC0_REFTOP_SELBIASOFF (1 << 3) > + > +#define TEMPSENSE0 0x0180 > +#define TEMPSENSE0_TEMP_CNT_SHIFT 8 > +#define TEMPSENSE0_TEMP_CNT_MASK (0xfff << TEMPSENSE0_TEMP_CNT_SHIFT) > +#define TEMPSENSE0_FINISHED (1 << 2) > +#define TEMPSENSE0_MEASURE_TEMP (1 << 1) > +#define TEMPSENSE0_POWER_DOWN (1 << 0) > + > +#define TEMPSENSE1 0x0190 > +#define TEMPSENSE1_MEASURE_FREQ 0xffff > + > +#define OCOTP_ANA1 0x04e0 > + > +/* The driver supports 1 active trip point and 1 critical trip point */ > +enum imx_thermal_trip { > + IMX_TRIP_ACTIVE, > + IMX_TRIP_CRITICAL, > + IMX_TRIP_NUM, > +}; > + > +/* > + * It defines the temperature in millicelsius for active trip point > + * that will trigger cooling action when crossed. > + */ > +#define IMX_TEMP_ACTIVE 85000 > + > +/* > + * The maximum die temperature on imx parts is 105C, let's give some cushion > + * for noise and possible temperature rise between measurements. > + */ > +#define IMX_TEMP_CRITICAL 100000 > + > +#define IMX_THERMAL_POLLING_INTERVAL 1000 /* millisecond */ > + > +struct imx_thermal_data { > + struct thermal_zone_device *tz; > + struct thermal_cooling_device *cdev; > + enum thermal_device_mode mode; > + struct regmap *tempmon; > + bool meas_suspended; > + int c1, c2; /* See forumla in imx_get_sensor_data() */ > +}; > + > +static int imx_get_temp(struct thermal_zone_device *tz, unsigned long *temp) > +{ > + struct imx_thermal_data *data = tz->devdata; > + struct regmap *map = data->tempmon; > + static unsigned long last_temp; > + unsigned int n_meas; > + u32 val; > + > + /* > + * Every time we measure the temperature, we will power on the > + * temperature sensor, enable measurements, take a reading, > + * disable measurements, power off the temperature sensor. > + */ > + regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_POWER_DOWN); > + regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_MEASURE_TEMP); > + > + /* > + * According to the temp sensor designers, it may require up to ~17us > + * to complete a measurement. But this timing isn't checked on every > + * part nor is it specified in the datasheet, so sleeping at least 1ms > + * should provide plenty of time. Sleeping longer than 1ms is ok so no > + * need for usleep_range. > + */ > + msleep(1); > + > + regmap_read(map, TEMPSENSE0, &val); > + regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_MEASURE_TEMP); > + regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_POWER_DOWN); > + > + if ((val & TEMPSENSE0_FINISHED) == 0) { > + dev_dbg(&tz->device, "temp measurement never finished\n"); > + return -EAGAIN; > + } > + > + n_meas = (val & TEMPSENSE0_TEMP_CNT_MASK) >> TEMPSENSE0_TEMP_CNT_SHIFT; > + > + /* See imx_get_sensor_data() for forumla derivation */ > + *temp = data->c2 + data->c1 * n_meas; > + > + if (*temp != last_temp) { > + dev_dbg(&tz->device, "millicelsius: %ld\n", *temp); > + last_temp = *temp; > + } > + > + return 0; > +} > + > +static int imx_get_mode(struct thermal_zone_device *tz, > + enum thermal_device_mode *mode) > +{ > + struct imx_thermal_data *data = tz->devdata; > + > + *mode = data->mode; > + > + return 0; > +} > + > +static int imx_set_mode(struct thermal_zone_device *tz, > + enum thermal_device_mode mode) > +{ > + struct imx_thermal_data *data = tz->devdata; > + > + tz->polling_delay = (mode == THERMAL_DEVICE_ENABLED) ? > + IMX_THERMAL_POLLING_INTERVAL : 0; > + data->mode = mode; > + thermal_zone_device_update(tz); > + > + return 0; > +} > + > +static int imx_get_trip_type(struct thermal_zone_device *tz, int trip, > + enum thermal_trip_type *type) > +{ > + *type = (trip == IMX_TRIP_ACTIVE) ? THERMAL_TRIP_ACTIVE : > + THERMAL_TRIP_CRITICAL; > + return 0; > +} > + > +static int imx_get_crit_temp(struct thermal_zone_device *tz, > + unsigned long *temp) > +{ > + *temp = IMX_TEMP_CRITICAL; > + return 0; > +} > + > +static int imx_get_trip_temp(struct thermal_zone_device *tz, int trip, > + unsigned long *temp) > +{ > + *temp = (trip == IMX_TRIP_ACTIVE) ? IMX_TEMP_ACTIVE : > + IMX_TEMP_CRITICAL; > + return 0; > +} > + > +static int imx_bind(struct thermal_zone_device *tz, > + struct thermal_cooling_device *cdev) > +{ > + int ret; > + > + ret = thermal_zone_bind_cooling_device(tz, IMX_TRIP_ACTIVE, cdev, > + THERMAL_NO_LIMIT, > + THERMAL_NO_LIMIT); > + if (ret) { > + dev_err(&tz->device, > + "binding zone %s with cdev %s failed:%d\n", > + tz->type, cdev->type, ret); > + return ret; > + } > + > + return 0; > +} > + > +static int imx_unbind(struct thermal_zone_device *tz, > + struct thermal_cooling_device *cdev) > +{ > + int ret; > + > + ret = thermal_zone_unbind_cooling_device(tz, IMX_TRIP_ACTIVE, cdev); > + if (ret) { > + dev_err(&tz->device, > + "unbinding zone %s with cdev %s failed:%d\n", > + tz->type, cdev->type, ret); > + return ret; > + } > + > + return 0; > +} > + > +static const struct thermal_zone_device_ops imx_tz_ops = { > + .bind = imx_bind, > + .unbind = imx_unbind, > + .get_temp = imx_get_temp, > + .get_mode = imx_get_mode, > + .set_mode = imx_set_mode, > + .get_trip_type = imx_get_trip_type, > + .get_trip_temp = imx_get_trip_temp, > + .get_crit_temp = imx_get_crit_temp, > +}; > + > +static int imx_get_sensor_data(struct platform_device *pdev) > +{ > + struct imx_thermal_data *data = platform_get_drvdata(pdev); > + struct regmap *map; > + int t1, t2, n1, n2; > + int ret; > + u32 val; > + > + map = syscon_regmap_lookup_by_phandle(pdev->dev.of_node, > + "fsl,tempmon-data"); > + if (IS_ERR(map)) { > + ret = PTR_ERR(map); > + dev_err(&pdev->dev, "failed to get sensor regmap: %d\n", ret); > + return ret; > + } > + > + ret = regmap_read(map, OCOTP_ANA1, &val); > + if (ret) { > + dev_err(&pdev->dev, "failed to read sensor data: %d\n", ret); > + return ret; > + } > + > + if (val == 0 || val == ~0) { > + dev_err(&pdev->dev, "invalid sensor calibration data\n"); > + return -EINVAL; > + } > + > + /* > + * Sensor data layout: > + * [31:20] - sensor value @ 25C > + * [19:8] - sensor value of hot > + * [7:0] - hot temperature value > + */ > + n1 = val >> 20; > + n2 = (val & 0xfff00) >> 8; > + t2 = val & 0xff; > + t1 = 25; /* t1 always 25C */ > + > + /* > + * Derived from linear interpolation, > + * Tmeas = T2 + (Nmeas - N2) * (T1 - T2) / (N1 - N2) > + * We want to reduce this down to the minimum computation necessary > + * for each temperature read. Also, we want Tmeas in millicelsius > + * and we don't want to lose precision from integer division. So... > + * milli_Tmeas = 1000 * T2 + 1000 * (Nmeas - N2) * (T1 - T2) / (N1 - N2) > + * Let constant c1 = 1000 * (T1 - T2) / (N1 - N2) > + * milli_Tmeas = (1000 * T2) + c1 * (Nmeas - N2) > + * milli_Tmeas = (1000 * T2) + (c1 * Nmeas) - (c1 * N2) > + * Let constant c2 = (1000 * T2) - (c1 * N2) > + * milli_Tmeas = c2 + (c1 * Nmeas) > + */ > + data->c1 = 1000 * (t1 - t2) / (n1 - n2); > + data->c2 = 1000 * t2 - data->c1 * n2; > + > + return 0; > +} > + > +static int imx_thermal_probe(struct platform_device *pdev) > +{ > + struct imx_thermal_data *data; > + struct cpumask clip_cpus; > + struct regmap *map; > + int ret; > + > + data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL); > + if (!data) > + return -ENOMEM; > + > + map = syscon_regmap_lookup_by_phandle(pdev->dev.of_node, "fsl,tempmon"); > + if (IS_ERR(map)) { > + ret = PTR_ERR(map); > + dev_err(&pdev->dev, "failed to get tempmon regmap: %d\n", ret); > + return ret; > + } > + data->tempmon = map; > + > + platform_set_drvdata(pdev, data); > + > + ret = imx_get_sensor_data(pdev); > + if (ret) { > + dev_err(&pdev->dev, "failed to get sensor data\n"); > + return ret; > + } > + > + /* Make sure sensor is in known good state for measurements */ > + regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_POWER_DOWN); > + regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_MEASURE_TEMP); > + regmap_write(map, TEMPSENSE1 + REG_CLR, TEMPSENSE1_MEASURE_FREQ); > + regmap_write(map, MISC0 + REG_SET, MISC0_REFTOP_SELBIASOFF); > + regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_POWER_DOWN); > + > + cpumask_set_cpu(0, &clip_cpus); > + data->cdev = cpufreq_cooling_register(&clip_cpus); > + if (IS_ERR(data->cdev)) { > + ret = PTR_ERR(data->cdev); > + dev_err(&pdev->dev, > + "failed to register cpufreq cooling device: %d\n", ret); > + return ret; > + } > + > + data->tz = thermal_zone_device_register("imx_thermal_zone", > + IMX_TRIP_NUM, 0, data, > + &imx_tz_ops, NULL, 0, > + IMX_THERMAL_POLLING_INTERVAL); > + if (IS_ERR(data->tz)) { > + ret = PTR_ERR(data->tz); > + dev_err(&pdev->dev, > + "failed to register thermal zone device %d\n", ret); > + cpufreq_cooling_unregister(data->cdev); > + return ret; > + } > + > + data->mode = THERMAL_DEVICE_ENABLED; > + > + return 0; > +} > + > +static int imx_thermal_remove(struct platform_device *pdev) > +{ > + struct imx_thermal_data *data = platform_get_drvdata(pdev); > + > + thermal_zone_device_unregister(data->tz); > + cpufreq_cooling_unregister(data->cdev); > + > + return 0; > +} > + > +#ifdef CONFIG_PM_SLEEP > +static int imx_thermal_suspend(struct device *dev) > +{ > + struct imx_thermal_data *data = dev_get_drvdata(dev); > + struct regmap *map = data->tempmon; > + u32 val; > + > + regmap_read(map, TEMPSENSE0, &val); > + > + /* Was a measurement taking place? If not, nothing to do. */ > + if (val & TEMPSENSE0_POWER_DOWN) > + return 0; > + > + regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_MEASURE_TEMP); > + regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_POWER_DOWN); > + > + data->meas_suspended = true; > + > + return 0; > +} > + > +static int imx_thermal_resume(struct device *dev) > +{ > + struct imx_thermal_data *data = dev_get_drvdata(dev); > + struct regmap *map = data->tempmon; > + > + /* > + * If a measurement was taking place while suspend, re-take the > + * measurement. > + */ > + if (data->meas_suspended) { > + regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_POWER_DOWN); > + regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_MEASURE_TEMP); > + /* > + * According to the temp sensor designers, it may require > + * up to ~17us to complete a measurement. But this timing > + * isn't checked on every part nor is it specified in the > + * datasheet, so delay 50us for timing margin. > + */ > + udelay(50); > + data->meas_suspended = false; > + } > + > + return 0; > +} > +#endif > + > +static SIMPLE_DEV_PM_OPS(imx_thermal_pm_ops, > + imx_thermal_suspend, imx_thermal_resume); > + > +static const struct of_device_id of_imx_thermal_match[] = { > + { .compatible = "fsl,imx6q-tempmon", }, > + { /* end */ } > +}; > + > +static struct platform_driver imx_thermal = { > + .driver = { > + .name = "imx_thermal", > + .owner = THIS_MODULE, > + .pm = &imx_thermal_pm_ops, > + .of_match_table = of_imx_thermal_match, > + }, > + .probe = imx_thermal_probe, > + .remove = imx_thermal_remove, > +}; > + > +static int __init imx_thermal_init(void) > +{ > + return platform_driver_register(&imx_thermal); > +} > +late_initcall(imx_thermal_init); > + > +static void __exit imx_thermal_exit(void) > +{ > + platform_driver_unregister(&imx_thermal); > +} > +module_exit(imx_thermal_exit); > + > +MODULE_AUTHOR("Freescale Semiconductor, Inc."); > +MODULE_DESCRIPTION("Thermal driver for Freescale i.MX SoCs"); > +MODULE_LICENSE("GPL"); > +MODULE_ALIAS("platform:imx-thermal"); > -- > 1.7.9.5 > >