Merge branch 'for_3.12/imx' of git://git.kernel.org/pub/scm/linux/kernel/git/evalenti/linux-soc-thermal into imx
This commit is contained in:
Zhang Rui
commit
cba77f5312
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@ -0,0 +1,17 @@
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* Temperature Monitor (TEMPMON) on Freescale i.MX SoCs
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Required properties:
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- compatible : "fsl,imx6q-thermal"
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- fsl,tempmon : phandle pointer to system controller that contains TEMPMON
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control registers, e.g. ANATOP on imx6q.
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- fsl,tempmon-data : phandle pointer to fuse controller that contains TEMPMON
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calibration data, e.g. OCOTP on imx6q. The details about calibration data
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can be found in SoC Reference Manual.
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Example:
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tempmon {
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compatible = "fsl,imx6q-tempmon";
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fsl,tempmon = <&anatop>;
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fsl,tempmon-data = <&ocotp>;
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};
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@ -91,6 +91,17 @@ config THERMAL_EMULATION
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because userland can easily disable the thermal policy by simply
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flooding this sysfs node with low temperature values.
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config IMX_THERMAL
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tristate "Temperature sensor driver for Freescale i.MX SoCs"
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depends on CPU_THERMAL
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depends on MFD_SYSCON
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depends on OF
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help
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Support for Temperature Monitor (TEMPMON) found on Freescale i.MX SoCs.
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It supports one critical trip point and one passive trip point. The
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cpufreq is used as the cooling device to throttle CPUs when the
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passive trip is crossed.
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config SPEAR_THERMAL
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bool "SPEAr thermal sensor driver"
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depends on PLAT_SPEAR
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@ -21,6 +21,7 @@ obj-$(CONFIG_EXYNOS_THERMAL) += exynos_thermal.o
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obj-$(CONFIG_DOVE_THERMAL) += dove_thermal.o
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obj-$(CONFIG_DB8500_THERMAL) += db8500_thermal.o
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obj-$(CONFIG_ARMADA_THERMAL) += armada_thermal.o
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obj-$(CONFIG_IMX_THERMAL) += imx_thermal.o
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obj-$(CONFIG_DB8500_CPUFREQ_COOLING) += db8500_cpufreq_cooling.o
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obj-$(CONFIG_INTEL_POWERCLAMP) += intel_powerclamp.o
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obj-$(CONFIG_X86_PKG_TEMP_THERMAL) += x86_pkg_temp_thermal.o
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@ -0,0 +1,397 @@
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/*
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* Copyright 2013 Freescale Semiconductor, Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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*/
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#include <linux/cpu_cooling.h>
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#include <linux/cpufreq.h>
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#include <linux/delay.h>
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#include <linux/device.h>
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#include <linux/init.h>
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#include <linux/io.h>
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#include <linux/kernel.h>
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#include <linux/mfd/syscon.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/platform_device.h>
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#include <linux/regmap.h>
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#include <linux/slab.h>
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#include <linux/thermal.h>
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#include <linux/types.h>
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#define REG_SET 0x4
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#define REG_CLR 0x8
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#define REG_TOG 0xc
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#define MISC0 0x0150
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#define MISC0_REFTOP_SELBIASOFF (1 << 3)
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#define TEMPSENSE0 0x0180
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#define TEMPSENSE0_TEMP_CNT_SHIFT 8
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#define TEMPSENSE0_TEMP_CNT_MASK (0xfff << TEMPSENSE0_TEMP_CNT_SHIFT)
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#define TEMPSENSE0_FINISHED (1 << 2)
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#define TEMPSENSE0_MEASURE_TEMP (1 << 1)
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#define TEMPSENSE0_POWER_DOWN (1 << 0)
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#define TEMPSENSE1 0x0190
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#define TEMPSENSE1_MEASURE_FREQ 0xffff
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#define OCOTP_ANA1 0x04e0
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/* The driver supports 1 passive trip point and 1 critical trip point */
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enum imx_thermal_trip {
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IMX_TRIP_PASSIVE,
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IMX_TRIP_CRITICAL,
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IMX_TRIP_NUM,
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};
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/*
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* It defines the temperature in millicelsius for passive trip point
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* that will trigger cooling action when crossed.
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*/
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#define IMX_TEMP_PASSIVE 85000
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/*
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* The maximum die temperature on imx parts is 105C, let's give some cushion
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* for noise and possible temperature rise between measurements.
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*/
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#define IMX_TEMP_CRITICAL 100000
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#define IMX_POLLING_DELAY 2000 /* millisecond */
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#define IMX_PASSIVE_DELAY 1000
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struct imx_thermal_data {
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struct thermal_zone_device *tz;
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struct thermal_cooling_device *cdev;
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enum thermal_device_mode mode;
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struct regmap *tempmon;
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int c1, c2; /* See formula in imx_get_sensor_data() */
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};
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static int imx_get_temp(struct thermal_zone_device *tz, unsigned long *temp)
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{
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struct imx_thermal_data *data = tz->devdata;
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struct regmap *map = data->tempmon;
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static unsigned long last_temp;
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unsigned int n_meas;
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u32 val;
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/*
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* Every time we measure the temperature, we will power on the
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* temperature sensor, enable measurements, take a reading,
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* disable measurements, power off the temperature sensor.
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*/
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regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_POWER_DOWN);
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regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_MEASURE_TEMP);
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/*
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* According to the temp sensor designers, it may require up to ~17us
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* to complete a measurement.
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*/
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usleep_range(20, 50);
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regmap_read(map, TEMPSENSE0, &val);
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regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_MEASURE_TEMP);
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regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_POWER_DOWN);
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if ((val & TEMPSENSE0_FINISHED) == 0) {
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dev_dbg(&tz->device, "temp measurement never finished\n");
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return -EAGAIN;
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}
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n_meas = (val & TEMPSENSE0_TEMP_CNT_MASK) >> TEMPSENSE0_TEMP_CNT_SHIFT;
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/* See imx_get_sensor_data() for formula derivation */
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*temp = data->c2 + data->c1 * n_meas;
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if (*temp != last_temp) {
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dev_dbg(&tz->device, "millicelsius: %ld\n", *temp);
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last_temp = *temp;
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}
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return 0;
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}
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static int imx_get_mode(struct thermal_zone_device *tz,
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enum thermal_device_mode *mode)
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{
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struct imx_thermal_data *data = tz->devdata;
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*mode = data->mode;
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return 0;
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}
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static int imx_set_mode(struct thermal_zone_device *tz,
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enum thermal_device_mode mode)
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{
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struct imx_thermal_data *data = tz->devdata;
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if (mode == THERMAL_DEVICE_ENABLED) {
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tz->polling_delay = IMX_POLLING_DELAY;
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tz->passive_delay = IMX_PASSIVE_DELAY;
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} else {
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tz->polling_delay = 0;
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tz->passive_delay = 0;
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}
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data->mode = mode;
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thermal_zone_device_update(tz);
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return 0;
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}
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static int imx_get_trip_type(struct thermal_zone_device *tz, int trip,
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enum thermal_trip_type *type)
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{
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*type = (trip == IMX_TRIP_PASSIVE) ? THERMAL_TRIP_PASSIVE :
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THERMAL_TRIP_CRITICAL;
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return 0;
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}
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static int imx_get_crit_temp(struct thermal_zone_device *tz,
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unsigned long *temp)
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{
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*temp = IMX_TEMP_CRITICAL;
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return 0;
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}
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static int imx_get_trip_temp(struct thermal_zone_device *tz, int trip,
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unsigned long *temp)
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{
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*temp = (trip == IMX_TRIP_PASSIVE) ? IMX_TEMP_PASSIVE :
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IMX_TEMP_CRITICAL;
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return 0;
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}
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static int imx_bind(struct thermal_zone_device *tz,
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struct thermal_cooling_device *cdev)
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{
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int ret;
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ret = thermal_zone_bind_cooling_device(tz, IMX_TRIP_PASSIVE, cdev,
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THERMAL_NO_LIMIT,
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THERMAL_NO_LIMIT);
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if (ret) {
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dev_err(&tz->device,
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"binding zone %s with cdev %s failed:%d\n",
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tz->type, cdev->type, ret);
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return ret;
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}
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return 0;
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}
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static int imx_unbind(struct thermal_zone_device *tz,
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struct thermal_cooling_device *cdev)
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{
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int ret;
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ret = thermal_zone_unbind_cooling_device(tz, IMX_TRIP_PASSIVE, cdev);
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if (ret) {
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dev_err(&tz->device,
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"unbinding zone %s with cdev %s failed:%d\n",
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tz->type, cdev->type, ret);
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return ret;
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}
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return 0;
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}
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static const struct thermal_zone_device_ops imx_tz_ops = {
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.bind = imx_bind,
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.unbind = imx_unbind,
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.get_temp = imx_get_temp,
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.get_mode = imx_get_mode,
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.set_mode = imx_set_mode,
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.get_trip_type = imx_get_trip_type,
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.get_trip_temp = imx_get_trip_temp,
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.get_crit_temp = imx_get_crit_temp,
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};
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static int imx_get_sensor_data(struct platform_device *pdev)
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{
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struct imx_thermal_data *data = platform_get_drvdata(pdev);
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struct regmap *map;
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int t1, t2, n1, n2;
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int ret;
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u32 val;
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map = syscon_regmap_lookup_by_phandle(pdev->dev.of_node,
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"fsl,tempmon-data");
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if (IS_ERR(map)) {
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ret = PTR_ERR(map);
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dev_err(&pdev->dev, "failed to get sensor regmap: %d\n", ret);
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return ret;
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}
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ret = regmap_read(map, OCOTP_ANA1, &val);
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if (ret) {
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dev_err(&pdev->dev, "failed to read sensor data: %d\n", ret);
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return ret;
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}
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if (val == 0 || val == ~0) {
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dev_err(&pdev->dev, "invalid sensor calibration data\n");
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return -EINVAL;
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}
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/*
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* Sensor data layout:
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* [31:20] - sensor value @ 25C
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* [19:8] - sensor value of hot
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* [7:0] - hot temperature value
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*/
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n1 = val >> 20;
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n2 = (val & 0xfff00) >> 8;
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t2 = val & 0xff;
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t1 = 25; /* t1 always 25C */
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/*
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* Derived from linear interpolation,
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* Tmeas = T2 + (Nmeas - N2) * (T1 - T2) / (N1 - N2)
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* We want to reduce this down to the minimum computation necessary
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* for each temperature read. Also, we want Tmeas in millicelsius
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* and we don't want to lose precision from integer division. So...
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* milli_Tmeas = 1000 * T2 + 1000 * (Nmeas - N2) * (T1 - T2) / (N1 - N2)
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* Let constant c1 = 1000 * (T1 - T2) / (N1 - N2)
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* milli_Tmeas = (1000 * T2) + c1 * (Nmeas - N2)
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* milli_Tmeas = (1000 * T2) + (c1 * Nmeas) - (c1 * N2)
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* Let constant c2 = (1000 * T2) - (c1 * N2)
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* milli_Tmeas = c2 + (c1 * Nmeas)
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*/
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data->c1 = 1000 * (t1 - t2) / (n1 - n2);
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data->c2 = 1000 * t2 - data->c1 * n2;
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return 0;
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}
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static int imx_thermal_probe(struct platform_device *pdev)
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{
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struct imx_thermal_data *data;
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struct cpumask clip_cpus;
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struct regmap *map;
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int ret;
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data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
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if (!data)
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return -ENOMEM;
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map = syscon_regmap_lookup_by_phandle(pdev->dev.of_node, "fsl,tempmon");
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if (IS_ERR(map)) {
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ret = PTR_ERR(map);
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dev_err(&pdev->dev, "failed to get tempmon regmap: %d\n", ret);
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return ret;
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}
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data->tempmon = map;
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platform_set_drvdata(pdev, data);
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ret = imx_get_sensor_data(pdev);
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if (ret) {
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dev_err(&pdev->dev, "failed to get sensor data\n");
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return ret;
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}
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/* Make sure sensor is in known good state for measurements */
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regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_POWER_DOWN);
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regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_MEASURE_TEMP);
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regmap_write(map, TEMPSENSE1 + REG_CLR, TEMPSENSE1_MEASURE_FREQ);
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regmap_write(map, MISC0 + REG_SET, MISC0_REFTOP_SELBIASOFF);
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regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_POWER_DOWN);
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cpumask_set_cpu(0, &clip_cpus);
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data->cdev = cpufreq_cooling_register(&clip_cpus);
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if (IS_ERR(data->cdev)) {
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ret = PTR_ERR(data->cdev);
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dev_err(&pdev->dev,
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"failed to register cpufreq cooling device: %d\n", ret);
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return ret;
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}
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data->tz = thermal_zone_device_register("imx_thermal_zone",
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IMX_TRIP_NUM, 0, data,
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&imx_tz_ops, NULL,
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IMX_PASSIVE_DELAY,
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IMX_POLLING_DELAY);
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if (IS_ERR(data->tz)) {
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ret = PTR_ERR(data->tz);
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dev_err(&pdev->dev,
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"failed to register thermal zone device %d\n", ret);
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cpufreq_cooling_unregister(data->cdev);
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return ret;
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}
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data->mode = THERMAL_DEVICE_ENABLED;
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return 0;
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}
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static int imx_thermal_remove(struct platform_device *pdev)
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{
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struct imx_thermal_data *data = platform_get_drvdata(pdev);
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thermal_zone_device_unregister(data->tz);
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cpufreq_cooling_unregister(data->cdev);
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return 0;
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}
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#ifdef CONFIG_PM_SLEEP
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static int imx_thermal_suspend(struct device *dev)
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{
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struct imx_thermal_data *data = dev_get_drvdata(dev);
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struct regmap *map = data->tempmon;
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u32 val;
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regmap_read(map, TEMPSENSE0, &val);
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if ((val & TEMPSENSE0_POWER_DOWN) == 0) {
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/*
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* If a measurement is taking place, wait for a long enough
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* time for it to finish, and then check again. If it still
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* does not finish, something must go wrong.
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*/
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udelay(50);
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regmap_read(map, TEMPSENSE0, &val);
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if ((val & TEMPSENSE0_POWER_DOWN) == 0)
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return -ETIMEDOUT;
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}
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return 0;
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}
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static int imx_thermal_resume(struct device *dev)
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{
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/* Nothing to do for now */
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return 0;
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}
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#endif
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static SIMPLE_DEV_PM_OPS(imx_thermal_pm_ops,
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imx_thermal_suspend, imx_thermal_resume);
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static const struct of_device_id of_imx_thermal_match[] = {
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{ .compatible = "fsl,imx6q-tempmon", },
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{ /* end */ }
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};
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static struct platform_driver imx_thermal = {
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.driver = {
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.name = "imx_thermal",
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.owner = THIS_MODULE,
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.pm = &imx_thermal_pm_ops,
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.of_match_table = of_imx_thermal_match,
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},
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.probe = imx_thermal_probe,
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.remove = imx_thermal_remove,
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};
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module_platform_driver(imx_thermal);
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MODULE_AUTHOR("Freescale Semiconductor, Inc.");
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MODULE_DESCRIPTION("Thermal driver for Freescale i.MX SoCs");
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MODULE_LICENSE("GPL v2");
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MODULE_ALIAS("platform:imx-thermal");
|
||||
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