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![Tim Harvey](/assets/img/avatar_default.png)
The IMX6Q/IMX6DL SoC's have a 2-bit temperature grade stored in OTP which is valid for all IMX6 SoC's (despite the fact that the IMXSDLRM and IMXSXRM do not document this - this has been proven via tests as well as verified by Freescale FAE). Instead of assuming a fixed 85C for passive cooling threshold and 105C for critical use the thermal grade for these configurations. We will set the critical to maxT - 5C and passive to maxT - 10C. Cc: Anson Huang <b20788@freescale.com> Cc: Fabio Estevam <fabio.estevam@freescale.com> Acked-by: Shawn Guo <shawn.guo@linaro.org> Acked-by: Jon Nettleton <jon@solid-run.com> Signed-off-by: Tim Harvey <tharvey@gateworks.com> ---- v3: - rebase against linux-soc-thermal.git - added ack's from Shawn and Jon v2: - remove check for IMX6Q and update comments: The OTP values have been tested on IMX6SOLO, IMX6DUALLITE, and IMX6SX and Freescale FAE has shared data with me that the OTP settings are the same and that the reference manuals will reflect this in their next updates. - set critical to max - 5C - set passive to max - 10C - display max temp in info - do not allow passive to be set above critical Signed-off-by: Eduardo Valentin <edubezval@gmail.com>
677 lines
18 KiB
C
677 lines
18 KiB
C
/*
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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/clk.h>
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#include <linux/cpu_cooling.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/interrupt.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/of_device.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 MISC1 0x0160
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#define MISC1_IRQ_TEMPHIGH (1 << 29)
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/* Below LOW and PANIC bits are only for TEMPMON_IMX6SX */
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#define MISC1_IRQ_TEMPLOW (1 << 28)
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#define MISC1_IRQ_TEMPPANIC (1 << 27)
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#define TEMPSENSE0 0x0180
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#define TEMPSENSE0_ALARM_VALUE_SHIFT 20
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#define TEMPSENSE0_ALARM_VALUE_MASK (0xfff << TEMPSENSE0_ALARM_VALUE_SHIFT)
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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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/* Below TEMPSENSE2 is only for TEMPMON_IMX6SX */
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#define TEMPSENSE2 0x0290
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#define TEMPSENSE2_LOW_VALUE_SHIFT 0
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#define TEMPSENSE2_LOW_VALUE_MASK 0xfff
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#define TEMPSENSE2_PANIC_VALUE_SHIFT 16
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#define TEMPSENSE2_PANIC_VALUE_MASK 0xfff0000
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#define OCOTP_MEM0 0x0480
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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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#define IMX_POLLING_DELAY 2000 /* millisecond */
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#define IMX_PASSIVE_DELAY 1000
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#define FACTOR0 10000000
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#define FACTOR1 15976
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#define FACTOR2 4297157
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#define TEMPMON_IMX6Q 1
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#define TEMPMON_IMX6SX 2
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struct thermal_soc_data {
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u32 version;
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};
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static struct thermal_soc_data thermal_imx6q_data = {
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.version = TEMPMON_IMX6Q,
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};
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static struct thermal_soc_data thermal_imx6sx_data = {
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.version = TEMPMON_IMX6SX,
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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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u32 c1, c2; /* See formula in imx_get_sensor_data() */
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int temp_passive;
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int temp_critical;
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int temp_max;
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int alarm_temp;
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int last_temp;
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bool irq_enabled;
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int irq;
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struct clk *thermal_clk;
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const struct thermal_soc_data *socdata;
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const char *temp_grade;
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};
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static void imx_set_panic_temp(struct imx_thermal_data *data,
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int panic_temp)
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{
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struct regmap *map = data->tempmon;
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int critical_value;
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critical_value = (data->c2 - panic_temp) / data->c1;
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regmap_write(map, TEMPSENSE2 + REG_CLR, TEMPSENSE2_PANIC_VALUE_MASK);
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regmap_write(map, TEMPSENSE2 + REG_SET, critical_value <<
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TEMPSENSE2_PANIC_VALUE_SHIFT);
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}
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static void imx_set_alarm_temp(struct imx_thermal_data *data,
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int alarm_temp)
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{
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struct regmap *map = data->tempmon;
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int alarm_value;
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data->alarm_temp = alarm_temp;
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alarm_value = (data->c2 - alarm_temp) / data->c1;
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regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_ALARM_VALUE_MASK);
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regmap_write(map, TEMPSENSE0 + REG_SET, alarm_value <<
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TEMPSENSE0_ALARM_VALUE_SHIFT);
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}
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static int imx_get_temp(struct thermal_zone_device *tz, int *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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unsigned int n_meas;
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bool wait;
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u32 val;
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if (data->mode == THERMAL_DEVICE_ENABLED) {
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/* Check if a measurement is currently in progress */
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regmap_read(map, TEMPSENSE0, &val);
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wait = !(val & TEMPSENSE0_FINISHED);
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} else {
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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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wait = true;
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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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if (wait)
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usleep_range(20, 50);
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regmap_read(map, TEMPSENSE0, &val);
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if (data->mode != THERMAL_DEVICE_ENABLED) {
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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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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 - n_meas * data->c1;
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/* Update alarm value to next higher trip point for TEMPMON_IMX6Q */
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if (data->socdata->version == TEMPMON_IMX6Q) {
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if (data->alarm_temp == data->temp_passive &&
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*temp >= data->temp_passive)
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imx_set_alarm_temp(data, data->temp_critical);
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if (data->alarm_temp == data->temp_critical &&
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*temp < data->temp_passive) {
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imx_set_alarm_temp(data, data->temp_passive);
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dev_dbg(&tz->device, "thermal alarm off: T < %d\n",
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data->alarm_temp / 1000);
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}
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}
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if (*temp != data->last_temp) {
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dev_dbg(&tz->device, "millicelsius: %d\n", *temp);
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data->last_temp = *temp;
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}
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/* Reenable alarm IRQ if temperature below alarm temperature */
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if (!data->irq_enabled && *temp < data->alarm_temp) {
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data->irq_enabled = true;
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enable_irq(data->irq);
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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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struct regmap *map = data->tempmon;
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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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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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if (!data->irq_enabled) {
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data->irq_enabled = true;
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enable_irq(data->irq);
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}
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} else {
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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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tz->polling_delay = 0;
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tz->passive_delay = 0;
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if (data->irq_enabled) {
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disable_irq(data->irq);
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data->irq_enabled = false;
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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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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, int *temp)
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{
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struct imx_thermal_data *data = tz->devdata;
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*temp = data->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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int *temp)
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{
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struct imx_thermal_data *data = tz->devdata;
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*temp = (trip == IMX_TRIP_PASSIVE) ? data->temp_passive :
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data->temp_critical;
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return 0;
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}
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static int imx_set_trip_temp(struct thermal_zone_device *tz, int trip,
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int temp)
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{
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struct imx_thermal_data *data = tz->devdata;
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/* do not allow changing critical threshold */
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if (trip == IMX_TRIP_CRITICAL)
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return -EPERM;
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/* do not allow passive to be set higher than critical */
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if (temp < 0 || temp > data->temp_critical)
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return -EINVAL;
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data->temp_passive = temp;
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imx_set_alarm_temp(data, temp);
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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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THERMAL_WEIGHT_DEFAULT);
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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 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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.set_trip_temp = imx_set_trip_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, n1;
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int ret;
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u32 val;
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u64 temp64;
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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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* Use universal formula now and only need sensor value @ 25C
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* slope = 0.4297157 - (0.0015976 * 25C fuse)
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*/
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n1 = val >> 20;
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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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* slope = 0.4297157 - (0.0015976 * 25C fuse)
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* slope = (FACTOR2 - FACTOR1 * n1) / FACTOR0
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* (Nmeas - n1) / (Tmeas - t1) = slope
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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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* Tmeas = (Nmeas - n1) / slope + t1
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* milli_Tmeas = 1000 * (Nmeas - n1) / slope + 1000 * t1
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* milli_Tmeas = -1000 * (n1 - Nmeas) / slope + 1000 * t1
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* Let constant c1 = (-1000 / slope)
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* milli_Tmeas = (n1 - Nmeas) * c1 + 1000 * t1
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* Let constant c2 = n1 *c1 + 1000 * t1
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* milli_Tmeas = c2 - Nmeas * c1
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*/
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temp64 = FACTOR0;
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temp64 *= 1000;
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do_div(temp64, FACTOR1 * n1 - FACTOR2);
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data->c1 = temp64;
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data->c2 = n1 * data->c1 + 1000 * t1;
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/* use OTP for thermal grade */
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ret = regmap_read(map, OCOTP_MEM0, &val);
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if (ret) {
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dev_err(&pdev->dev, "failed to read temp grade: %d\n", ret);
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return ret;
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}
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/* The maximum die temp is specified by the Temperature Grade */
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switch ((val >> 6) & 0x3) {
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case 0: /* Commercial (0 to 95C) */
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data->temp_grade = "Commercial";
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data->temp_max = 95000;
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break;
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case 1: /* Extended Commercial (-20 to 105C) */
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data->temp_grade = "Extended Commercial";
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data->temp_max = 105000;
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break;
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case 2: /* Industrial (-40 to 105C) */
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data->temp_grade = "Industrial";
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data->temp_max = 105000;
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break;
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case 3: /* Automotive (-40 to 125C) */
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data->temp_grade = "Automotive";
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data->temp_max = 125000;
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break;
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}
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/*
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* Set the critical trip point at 5C under max
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* Set the passive trip point at 10C under max (can change via sysfs)
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*/
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data->temp_critical = data->temp_max - (1000 * 5);
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data->temp_passive = data->temp_max - (1000 * 10);
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return 0;
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}
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static irqreturn_t imx_thermal_alarm_irq(int irq, void *dev)
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{
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struct imx_thermal_data *data = dev;
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disable_irq_nosync(irq);
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data->irq_enabled = false;
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return IRQ_WAKE_THREAD;
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}
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static irqreturn_t imx_thermal_alarm_irq_thread(int irq, void *dev)
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{
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struct imx_thermal_data *data = dev;
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dev_dbg(&data->tz->device, "THERMAL ALARM: T > %d\n",
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data->alarm_temp / 1000);
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thermal_zone_device_update(data->tz);
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return IRQ_HANDLED;
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}
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static const struct of_device_id of_imx_thermal_match[] = {
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{ .compatible = "fsl,imx6q-tempmon", .data = &thermal_imx6q_data, },
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{ .compatible = "fsl,imx6sx-tempmon", .data = &thermal_imx6sx_data, },
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{ /* end */ }
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};
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MODULE_DEVICE_TABLE(of, of_imx_thermal_match);
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static int imx_thermal_probe(struct platform_device *pdev)
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{
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const struct of_device_id *of_id =
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of_match_device(of_imx_thermal_match, &pdev->dev);
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struct imx_thermal_data *data;
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struct regmap *map;
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int measure_freq;
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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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data->socdata = of_id->data;
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/* make sure the IRQ flag is clear before enabling irq on i.MX6SX */
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if (data->socdata->version == TEMPMON_IMX6SX) {
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regmap_write(map, MISC1 + REG_CLR, MISC1_IRQ_TEMPHIGH |
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MISC1_IRQ_TEMPLOW | MISC1_IRQ_TEMPPANIC);
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/*
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* reset value of LOW ALARM is incorrect, set it to lowest
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* value to avoid false trigger of low alarm.
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*/
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regmap_write(map, TEMPSENSE2 + REG_SET,
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TEMPSENSE2_LOW_VALUE_MASK);
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}
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data->irq = platform_get_irq(pdev, 0);
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if (data->irq < 0)
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return data->irq;
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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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data->cdev = cpufreq_cooling_register(cpu_present_mask);
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if (IS_ERR(data->cdev)) {
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ret = PTR_ERR(data->cdev);
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if (ret != -EPROBE_DEFER)
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dev_err(&pdev->dev,
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"failed to register cpufreq cooling device: %d\n",
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ret);
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return ret;
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}
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data->thermal_clk = devm_clk_get(&pdev->dev, NULL);
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if (IS_ERR(data->thermal_clk)) {
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ret = PTR_ERR(data->thermal_clk);
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if (ret != -EPROBE_DEFER)
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dev_err(&pdev->dev,
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"failed to get thermal clk: %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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* Thermal sensor needs clk on to get correct value, normally
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* we should enable its clk before taking measurement and disable
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* clk after measurement is done, but if alarm function is enabled,
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* hardware will auto measure the temperature periodically, so we
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* need to keep the clk always on for alarm function.
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*/
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ret = clk_prepare_enable(data->thermal_clk);
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if (ret) {
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dev_err(&pdev->dev, "failed to enable thermal clk: %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->tz = thermal_zone_device_register("imx_thermal_zone",
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IMX_TRIP_NUM,
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BIT(IMX_TRIP_PASSIVE), 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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clk_disable_unprepare(data->thermal_clk);
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cpufreq_cooling_unregister(data->cdev);
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return ret;
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}
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dev_info(&pdev->dev, "%s CPU temperature grade - max:%dC"
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" critical:%dC passive:%dC\n", data->temp_grade,
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data->temp_max / 1000, data->temp_critical / 1000,
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data->temp_passive / 1000);
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/* Enable measurements at ~ 10 Hz */
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regmap_write(map, TEMPSENSE1 + REG_CLR, TEMPSENSE1_MEASURE_FREQ);
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measure_freq = DIV_ROUND_UP(32768, 10); /* 10 Hz */
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regmap_write(map, TEMPSENSE1 + REG_SET, measure_freq);
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imx_set_alarm_temp(data, data->temp_passive);
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if (data->socdata->version == TEMPMON_IMX6SX)
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imx_set_panic_temp(data, data->temp_critical);
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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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ret = devm_request_threaded_irq(&pdev->dev, data->irq,
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imx_thermal_alarm_irq, imx_thermal_alarm_irq_thread,
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0, "imx_thermal", data);
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if (ret < 0) {
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dev_err(&pdev->dev, "failed to request alarm irq: %d\n", ret);
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clk_disable_unprepare(data->thermal_clk);
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thermal_zone_device_unregister(data->tz);
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cpufreq_cooling_unregister(data->cdev);
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return ret;
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}
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data->irq_enabled = true;
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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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struct regmap *map = data->tempmon;
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/* Disable measurements */
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regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_POWER_DOWN);
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if (!IS_ERR(data->thermal_clk))
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clk_disable_unprepare(data->thermal_clk);
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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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/*
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* Need to disable thermal sensor, otherwise, when thermal core
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* try to get temperature before thermal sensor resume, a wrong
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* temperature will be read as the thermal sensor is powered
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* down.
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*/
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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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data->mode = THERMAL_DEVICE_DISABLED;
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clk_disable_unprepare(data->thermal_clk);
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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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struct imx_thermal_data *data = dev_get_drvdata(dev);
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struct regmap *map = data->tempmon;
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clk_prepare_enable(data->thermal_clk);
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/* Enabled thermal sensor after resume */
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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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data->mode = THERMAL_DEVICE_ENABLED;
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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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|
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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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.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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|
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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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