2019-05-27 14:55:06 +08:00
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// SPDX-License-Identifier: GPL-2.0-or-later
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2012-11-15 18:56:42 +08:00
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/*
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* db8500_thermal.c - DB8500 Thermal Management Implementation
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*
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* Copyright (C) 2012 ST-Ericsson
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2019-08-28 21:03:20 +08:00
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* Copyright (C) 2012-2019 Linaro Ltd.
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2012-11-15 18:56:42 +08:00
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*
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2019-08-28 21:03:20 +08:00
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* Authors: Hongbo Zhang, Linus Walleij
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2012-11-15 18:56:42 +08:00
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*/
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#include <linux/cpu_cooling.h>
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#include <linux/interrupt.h>
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#include <linux/mfd/dbx500-prcmu.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/slab.h>
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#include <linux/thermal.h>
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#define PRCMU_DEFAULT_MEASURE_TIME 0xFFF
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#define PRCMU_DEFAULT_LOW_TEMP 0
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2019-08-28 21:03:18 +08:00
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2019-08-28 21:03:20 +08:00
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/**
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* db8500_thermal_points - the interpolation points that trigger
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* interrupts
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*/
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static const unsigned long db8500_thermal_points[] = {
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15000,
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20000,
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25000,
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30000,
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35000,
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40000,
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45000,
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50000,
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55000,
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60000,
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65000,
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70000,
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75000,
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80000,
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/*
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* This is where things start to get really bad for the
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* SoC and the thermal zones should be set up to trigger
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* critical temperature at 85000 mC so we don't get above
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* this point.
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*/
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85000,
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90000,
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95000,
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100000,
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2019-08-28 21:03:18 +08:00
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};
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2012-11-15 18:56:42 +08:00
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struct db8500_thermal_zone {
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2019-08-28 21:03:20 +08:00
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struct thermal_zone_device *tz;
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unsigned long interpolated_temp;
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2012-11-15 18:56:42 +08:00
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unsigned int cur_index;
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};
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/* Callback to get current temperature */
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2022-08-05 06:43:31 +08:00
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static int db8500_thermal_get_temp(struct thermal_zone_device *tz, int *temp)
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2012-11-15 18:56:42 +08:00
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{
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2022-08-05 06:43:31 +08:00
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struct db8500_thermal_zone *th = tz->devdata;
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2012-11-15 18:56:42 +08:00
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/*
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* TODO: There is no PRCMU interface to get temperature data currently,
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* so a pseudo temperature is returned , it works for thermal framework
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* and this will be fixed when the PRCMU interface is available.
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*/
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2019-08-28 21:03:20 +08:00
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*temp = th->interpolated_temp;
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2012-11-15 18:56:42 +08:00
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return 0;
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}
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2022-08-05 06:43:31 +08:00
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static const struct thermal_zone_device_ops thdev_ops = {
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2019-08-28 21:03:20 +08:00
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.get_temp = db8500_thermal_get_temp,
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2012-11-15 18:56:42 +08:00
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};
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2019-08-28 21:03:20 +08:00
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static void db8500_thermal_update_config(struct db8500_thermal_zone *th,
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unsigned int idx,
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unsigned long next_low,
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unsigned long next_high)
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2012-11-15 18:56:42 +08:00
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{
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prcmu_stop_temp_sense();
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2019-08-28 21:03:20 +08:00
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th->cur_index = idx;
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th->interpolated_temp = (next_low + next_high)/2;
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2012-11-15 18:56:42 +08:00
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2019-08-28 21:03:20 +08:00
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/*
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* The PRCMU accept absolute temperatures in celsius so divide
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* down the millicelsius with 1000
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*/
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2012-11-15 18:56:42 +08:00
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prcmu_config_hotmon((u8)(next_low/1000), (u8)(next_high/1000));
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prcmu_start_temp_sense(PRCMU_DEFAULT_MEASURE_TIME);
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}
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static irqreturn_t prcmu_low_irq_handler(int irq, void *irq_data)
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{
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2019-08-28 21:03:20 +08:00
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struct db8500_thermal_zone *th = irq_data;
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unsigned int idx = th->cur_index;
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2012-11-15 18:56:42 +08:00
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unsigned long next_low, next_high;
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2019-08-28 21:03:20 +08:00
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if (idx == 0)
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2012-11-15 18:56:42 +08:00
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/* Meaningless for thermal management, ignoring it */
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return IRQ_HANDLED;
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if (idx == 1) {
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2019-08-28 21:03:20 +08:00
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next_high = db8500_thermal_points[0];
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2012-11-15 18:56:42 +08:00
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next_low = PRCMU_DEFAULT_LOW_TEMP;
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} else {
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2019-08-28 21:03:20 +08:00
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next_high = db8500_thermal_points[idx - 1];
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next_low = db8500_thermal_points[idx - 2];
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2012-11-15 18:56:42 +08:00
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}
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idx -= 1;
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2022-06-17 04:25:37 +08:00
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db8500_thermal_update_config(th, idx, next_low, next_high);
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2019-08-28 21:03:20 +08:00
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dev_dbg(&th->tz->device,
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2012-11-15 18:56:42 +08:00
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"PRCMU set max %ld, min %ld\n", next_high, next_low);
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2019-08-28 21:03:20 +08:00
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thermal_zone_device_update(th->tz, THERMAL_EVENT_UNSPECIFIED);
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2012-11-15 18:56:42 +08:00
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return IRQ_HANDLED;
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}
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static irqreturn_t prcmu_high_irq_handler(int irq, void *irq_data)
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{
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2019-08-28 21:03:20 +08:00
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struct db8500_thermal_zone *th = irq_data;
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unsigned int idx = th->cur_index;
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2012-11-15 18:56:42 +08:00
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unsigned long next_low, next_high;
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2019-08-28 21:03:20 +08:00
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int num_points = ARRAY_SIZE(db8500_thermal_points);
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2012-11-15 18:56:42 +08:00
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2019-08-28 21:03:20 +08:00
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if (idx < num_points - 1) {
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next_high = db8500_thermal_points[idx+1];
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next_low = db8500_thermal_points[idx];
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2012-11-15 18:56:42 +08:00
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idx += 1;
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2022-06-17 04:25:37 +08:00
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db8500_thermal_update_config(th, idx, next_low, next_high);
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2012-11-15 18:56:42 +08:00
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2019-11-19 15:46:50 +08:00
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dev_dbg(&th->tz->device,
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"PRCMU set max %ld, min %ld\n", next_high, next_low);
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2019-08-28 21:03:20 +08:00
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} else if (idx == num_points - 1)
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/* So we roof out 1 degree over the max point */
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th->interpolated_temp = db8500_thermal_points[idx] + 1;
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2012-11-15 18:56:42 +08:00
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2019-08-28 21:03:20 +08:00
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thermal_zone_device_update(th->tz, THERMAL_EVENT_UNSPECIFIED);
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2012-11-15 18:56:42 +08:00
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return IRQ_HANDLED;
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}
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static int db8500_thermal_probe(struct platform_device *pdev)
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{
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struct db8500_thermal_zone *th = NULL;
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2019-08-28 21:03:19 +08:00
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struct device *dev = &pdev->dev;
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2012-11-15 18:56:42 +08:00
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int low_irq, high_irq, ret = 0;
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2019-08-28 21:03:20 +08:00
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th = devm_kzalloc(dev, sizeof(*th), GFP_KERNEL);
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if (!th)
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2012-11-15 18:56:42 +08:00
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return -ENOMEM;
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low_irq = platform_get_irq_byname(pdev, "IRQ_HOTMON_LOW");
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2022-07-19 08:35:56 +08:00
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if (low_irq < 0)
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2019-08-28 21:03:20 +08:00
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return low_irq;
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2012-11-15 18:56:42 +08:00
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2019-08-28 21:03:19 +08:00
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ret = devm_request_threaded_irq(dev, low_irq, NULL,
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2012-11-15 18:56:42 +08:00
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prcmu_low_irq_handler, IRQF_NO_SUSPEND | IRQF_ONESHOT,
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2019-08-28 21:03:20 +08:00
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"dbx500_temp_low", th);
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2012-11-15 18:56:42 +08:00
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if (ret < 0) {
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2019-08-28 21:03:20 +08:00
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dev_err(dev, "failed to allocate temp low irq\n");
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return ret;
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2012-11-15 18:56:42 +08:00
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}
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high_irq = platform_get_irq_byname(pdev, "IRQ_HOTMON_HIGH");
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2022-07-19 08:35:56 +08:00
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if (high_irq < 0)
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2019-08-28 21:03:20 +08:00
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return high_irq;
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2012-11-15 18:56:42 +08:00
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2019-08-28 21:03:19 +08:00
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ret = devm_request_threaded_irq(dev, high_irq, NULL,
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2012-11-15 18:56:42 +08:00
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prcmu_high_irq_handler, IRQF_NO_SUSPEND | IRQF_ONESHOT,
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2019-08-28 21:03:20 +08:00
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"dbx500_temp_high", th);
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2012-11-15 18:56:42 +08:00
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if (ret < 0) {
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2019-08-28 21:03:20 +08:00
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dev_err(dev, "failed to allocate temp high irq\n");
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return ret;
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2012-11-15 18:56:42 +08:00
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}
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2019-08-28 21:03:20 +08:00
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/* register of thermal sensor and get info from DT */
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2022-08-05 06:43:31 +08:00
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th->tz = devm_thermal_of_zone_register(dev, 0, th, &thdev_ops);
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2019-08-28 21:03:20 +08:00
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if (IS_ERR(th->tz)) {
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dev_err(dev, "register thermal zone sensor failed\n");
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return PTR_ERR(th->tz);
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2012-11-15 18:56:42 +08:00
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}
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2019-08-28 21:03:20 +08:00
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dev_info(dev, "thermal zone sensor registered\n");
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2012-11-15 18:56:42 +08:00
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2019-08-28 21:03:20 +08:00
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/* Start measuring at the lowest point */
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2022-06-17 04:25:37 +08:00
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db8500_thermal_update_config(th, 0, PRCMU_DEFAULT_LOW_TEMP,
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2019-08-28 21:03:20 +08:00
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db8500_thermal_points[0]);
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2012-11-15 18:56:42 +08:00
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2019-08-28 21:03:20 +08:00
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platform_set_drvdata(pdev, th);
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2012-11-15 18:56:42 +08:00
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return 0;
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}
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static int db8500_thermal_suspend(struct platform_device *pdev,
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pm_message_t state)
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{
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prcmu_stop_temp_sense();
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return 0;
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}
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static int db8500_thermal_resume(struct platform_device *pdev)
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{
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2019-08-28 21:03:20 +08:00
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struct db8500_thermal_zone *th = platform_get_drvdata(pdev);
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2012-11-15 18:56:42 +08:00
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2019-08-28 21:03:20 +08:00
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/* Resume and start measuring at the lowest point */
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2022-06-17 04:25:37 +08:00
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db8500_thermal_update_config(th, 0, PRCMU_DEFAULT_LOW_TEMP,
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2019-08-28 21:03:20 +08:00
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db8500_thermal_points[0]);
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2012-11-15 18:56:42 +08:00
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return 0;
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}
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static const struct of_device_id db8500_thermal_match[] = {
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{ .compatible = "stericsson,db8500-thermal" },
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{},
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};
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2016-10-14 22:35:02 +08:00
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MODULE_DEVICE_TABLE(of, db8500_thermal_match);
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2012-11-15 18:56:42 +08:00
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static struct platform_driver db8500_thermal_driver = {
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.driver = {
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.name = "db8500-thermal",
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2012-12-19 16:50:58 +08:00
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.of_match_table = of_match_ptr(db8500_thermal_match),
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2012-11-15 18:56:42 +08:00
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},
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.probe = db8500_thermal_probe,
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.suspend = db8500_thermal_suspend,
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.resume = db8500_thermal_resume,
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};
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module_platform_driver(db8500_thermal_driver);
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MODULE_AUTHOR("Hongbo Zhang <hongbo.zhang@stericsson.com>");
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MODULE_DESCRIPTION("DB8500 thermal driver");
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MODULE_LICENSE("GPL");
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