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477 lines
13 KiB
477 lines
13 KiB
From ca3de46b50809000b5ba708634e26ad979a4a63a Mon Sep 17 00:00:00 2001
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From: Shawn Guo <shawn.guo@linaro.org>
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Date: Mon, 24 Jun 2013 14:30:44 +0800
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Subject: [PATCH] thermal: add imx thermal driver support
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This is based on the initial imx thermal work done by
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Rob Lee <rob.lee@linaro.org> (Not sure if the email address is still
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valid). Since he is no longer interested in the work and I have
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rewritten a significant amount of the code, I just took the authorship
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over from him.
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It adds the imx thermal support using Temperature Monitor (TEMPMON)
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block found on some Freescale i.MX SoCs. The driver uses syscon regmap
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interface to access TEMPMON control registers and calibration data, and
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supports cpufreq as the cooling device.
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Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
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Signed-off-by: Eduardo Valentin <eduardo.valentin@ti.com>
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---
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.../devicetree/bindings/thermal/imx-thermal.txt | 17 +
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drivers/thermal/Kconfig | 11 +
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drivers/thermal/Makefile | 1 +
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drivers/thermal/imx_thermal.c | 397 +++++++++++++++++++++
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4 files changed, 426 insertions(+)
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create mode 100644 Documentation/devicetree/bindings/thermal/imx-thermal.txt
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create mode 100644 drivers/thermal/imx_thermal.c
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--- /dev/null
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+++ b/Documentation/devicetree/bindings/thermal/imx-thermal.txt
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@@ -0,0 +1,17 @@
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+* Temperature Monitor (TEMPMON) on Freescale i.MX SoCs
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+
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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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+
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+Example:
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+
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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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--- a/drivers/thermal/Kconfig
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+++ b/drivers/thermal/Kconfig
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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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+
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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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--- a/drivers/thermal/Makefile
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+++ b/drivers/thermal/Makefile
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@@ -21,6 +21,7 @@ obj-$(CONFIG_EXYNOS_THERMAL) += exynos_t
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obj-$(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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--- /dev/null
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+++ b/drivers/thermal/imx_thermal.c
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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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+
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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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+
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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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+
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+#define MISC0 0x0150
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+#define MISC0_REFTOP_SELBIASOFF (1 << 3)
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+
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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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+
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+#define TEMPSENSE1 0x0190
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+#define TEMPSENSE1_MEASURE_FREQ 0xffff
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+
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+#define OCOTP_ANA1 0x04e0
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+
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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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+/*
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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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+/*
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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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+
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+#define IMX_POLLING_DELAY 2000 /* millisecond */
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+#define IMX_PASSIVE_DELAY 1000
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+
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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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+
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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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+ /*
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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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+ /*
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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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+
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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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+
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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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+
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+ n_meas = (val & TEMPSENSE0_TEMP_CNT_MASK) >> TEMPSENSE0_TEMP_CNT_SHIFT;
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+
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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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+
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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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+
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+ return 0;
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+}
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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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+
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+ *mode = data->mode;
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+
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+ return 0;
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+}
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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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+
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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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+
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+ data->mode = mode;
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+ thermal_zone_device_update(tz);
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+
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+ return 0;
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+}
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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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+
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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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+
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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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+
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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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+
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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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+
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+ return 0;
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+}
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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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+
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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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+
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+ return 0;
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+}
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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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+
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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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+
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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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+
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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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+
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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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+ /*
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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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+ /*
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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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+
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+ return 0;
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+}
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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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+
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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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+
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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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+
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+ platform_set_drvdata(pdev, data);
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+
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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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+
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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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+
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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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+
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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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+
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+ data->mode = THERMAL_DEVICE_ENABLED;
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+
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+ return 0;
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+}
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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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+
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+ thermal_zone_device_unregister(data->tz);
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+ cpufreq_cooling_unregister(data->cdev);
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+
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+ return 0;
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+}
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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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+
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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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+
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+ return 0;
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+}
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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
|
|
+
|
|
+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,
|
|
+};
|
|
+module_platform_driver(imx_thermal);
|
|
+
|
|
+MODULE_AUTHOR("Freescale Semiconductor, Inc.");
|
|
+MODULE_DESCRIPTION("Thermal driver for Freescale i.MX SoCs");
|
|
+MODULE_LICENSE("GPL v2");
|
|
+MODULE_ALIAS("platform:imx-thermal");
|
|
|