| // SPDX-License-Identifier: GPL-2.0 |
| /* |
| * Copyright 2018 NXP. |
| * |
| */ |
| |
| #include <linux/clk.h> |
| #include <linux/delay.h> |
| #include <linux/device_cooling.h> |
| #include <linux/err.h> |
| #include <linux/io.h> |
| #include <linux/module.h> |
| #include <linux/of.h> |
| #include <linux/of_address.h> |
| #include <linux/platform_device.h> |
| #include <linux/thermal.h> |
| |
| #include "thermal_core.h" |
| |
| #define TER 0x0 /* TMU enable */ |
| #define TSR 0x4 /* TMU status */ |
| #define TIER 0x8 /* TMU interrupt enable */ |
| #define TIDR 0xc /* TMU interrupt detect */ |
| #define TMHTITR 0x10 /* TMU high immediate threshold */ |
| #define TMHTATR 0x14 /* TMU high average threshold */ |
| #define TMHTCATR 0x18 /* TMU high average critical threshold */ |
| #define TSCR 0x1c /* TMU sensor val(raw, no calibration) */ |
| #define TRITSR 0x20 /* TMU immediate temp */ |
| #define TRATSR 0x24 /* TMU average temp */ |
| |
| #define TER_EN BIT(31) |
| #define TRITSR_VALID BIT(31) |
| #define TEMP_VAL_MASK 0xff |
| |
| #define TEMP_LOW_LIMIT 10 |
| |
| #define IMX_TEMP_PASSIVE_COOL_DELTA 10000 |
| |
| struct imx8mm_tmu { |
| struct thermal_zone_device *tzd; |
| struct thermal_cooling_device *cdev; |
| struct clk *clk; |
| void __iomem *tmu_base; |
| bool enabled; |
| int temp_passive; |
| int temp_critical; |
| }; |
| |
| /* The driver support 1 passive trip point and 1 critical trip point */ |
| enum imx_thermal_trip { |
| IMX_TRIP_PASSIVE, |
| IMX_TRIP_CRITICAL, |
| IMX_TRIP_NUM, |
| }; |
| |
| static int tmu_get_temp(void *data, int *temp) |
| { |
| struct imx8mm_tmu *tmu = data; |
| u32 val; |
| |
| /* the temp sensor need about 1ms to finish the measurement */ |
| msleep(1); |
| |
| /* read the calibrated temp value */ |
| val = readl_relaxed(tmu->tmu_base + TRITSR) & TEMP_VAL_MASK; |
| |
| /* check if the temp in the sensor's range */ |
| if (val < TEMP_LOW_LIMIT) |
| return -EAGAIN; |
| |
| *temp = val * 1000; |
| |
| return 0; |
| } |
| |
| static int tmu_get_trend(void *p, int trip, enum thermal_trend *trend) |
| { |
| int trip_temp; |
| struct imx8mm_tmu *tmu = p; |
| |
| if (!tmu->tzd) |
| return 0; |
| |
| trip_temp = (trip == IMX_TRIP_PASSIVE) ? tmu->temp_passive : tmu->temp_critical; |
| |
| if (tmu->tzd->temperature >= (trip_temp - IMX_TEMP_PASSIVE_COOL_DELTA)) |
| *trend = THERMAL_TREND_RAISE_FULL; |
| else |
| *trend = THERMAL_TREND_DROP_FULL; |
| |
| return 0; |
| } |
| |
| static int tmu_set_trip_temp(void *p, int trip, int temp) |
| { |
| struct imx8mm_tmu *tmu = p; |
| |
| if (trip == IMX_TRIP_CRITICAL) |
| tmu->temp_critical = temp; |
| |
| if (trip == IMX_TRIP_PASSIVE) |
| tmu->temp_passive = temp; |
| |
| return 0; |
| } |
| |
| static struct thermal_zone_of_device_ops tmu_tz_ops = { |
| .get_temp = tmu_get_temp, |
| .get_trend = tmu_get_trend, |
| .set_trip_temp = tmu_set_trip_temp, |
| }; |
| |
| static const struct of_device_id imx8mm_tmu_table[] = { |
| { .compatible = "fsl,imx8mm-tmu", }, |
| { }, |
| }; |
| |
| static int imx8mm_tmu_probe(struct platform_device *pdev) |
| { |
| int ret; |
| u32 val; |
| struct imx8mm_tmu *tmu; |
| const struct thermal_trip *trips; |
| struct device_node *np = pdev->dev.of_node; |
| |
| if (!np) { |
| dev_err(&pdev->dev, "device node NOT found\n"); |
| return -ENODEV; |
| } |
| |
| tmu = devm_kzalloc(&pdev->dev, sizeof(*tmu), GFP_KERNEL); |
| if (!tmu) |
| return -ENOMEM; |
| |
| platform_set_drvdata(pdev, tmu); |
| |
| tmu->tmu_base = of_iomap(np, 0); |
| if (!tmu->tmu_base) { |
| dev_err(&pdev->dev, "Failed to map the memory\n"); |
| return -ENODEV; |
| } |
| |
| tmu->clk = devm_clk_get(&pdev->dev, NULL); |
| if (IS_ERR(tmu->clk)) { |
| ret = PTR_ERR(tmu->clk); |
| dev_err(&pdev->dev, "Failed to get the tmu clk\n"); |
| goto err; |
| } |
| |
| /* register the thermal zone sensor */ |
| tmu->tzd = devm_thermal_zone_of_sensor_register(&pdev->dev, 0, tmu, &tmu_tz_ops); |
| |
| if (IS_ERR(tmu->tzd)) { |
| ret = PTR_ERR(tmu->tzd); |
| dev_err(&pdev->dev, "Failed to register thermal zone sensor %d\n", ret); |
| goto err; |
| } |
| |
| tmu->cdev = devfreq_cooling_register(); |
| if (IS_ERR(tmu->cdev)) { |
| ret = PTR_ERR(tmu->cdev); |
| if (ret != -EPROBE_DEFER) |
| dev_err(&pdev->dev, "failed to register devfreq cooling device %d\n", ret); |
| goto err; |
| } |
| |
| ret = thermal_zone_bind_cooling_device(tmu->tzd, |
| IMX_TRIP_PASSIVE, |
| tmu->cdev, |
| THERMAL_NO_LIMIT, |
| THERMAL_NO_LIMIT, |
| THERMAL_WEIGHT_DEFAULT); |
| if (ret) { |
| dev_err(&pdev->dev, |
| "binding zone %s with cdev %s failed:%d\n", |
| tmu->tzd->type, tmu->cdev->type, ret); |
| devfreq_cooling_unregister(tmu->cdev); |
| goto err; |
| } |
| |
| trips = of_thermal_get_trip_points(tmu->tzd); |
| |
| /* get the thermal trip temp */ |
| tmu->temp_passive = trips[0].temperature; |
| tmu->temp_critical = trips[1].temperature; |
| |
| /* enable the tmu clock */ |
| ret = clk_prepare_enable(tmu->clk); |
| if (ret) { |
| dev_warn(&pdev->dev, "tmu clock enable failed:%d\n", ret); |
| thermal_zone_unbind_cooling_device(tmu->tzd, IMX_TRIP_PASSIVE, tmu->cdev); |
| devfreq_cooling_unregister(tmu->cdev); |
| goto err; |
| } |
| |
| /* enable the monitor */ |
| val = readl_relaxed(tmu->tmu_base + TER); |
| val |= TER_EN; |
| writel_relaxed(val, tmu->tmu_base + TER); |
| |
| return 0; |
| err: |
| iounmap(tmu->tmu_base); |
| return ret; |
| } |
| |
| static int imx8mm_tmu_remove(struct platform_device *pdev) |
| { |
| u32 val; |
| struct imx8mm_tmu *tmu = platform_get_drvdata(pdev); |
| |
| thermal_zone_unbind_cooling_device(tmu->tzd, IMX_TRIP_PASSIVE, tmu->cdev); |
| devfreq_cooling_unregister(tmu->cdev); |
| |
| /* disable TMU */ |
| val = readl_relaxed(tmu->tmu_base + TER); |
| val &= ~TER_EN; |
| writel_relaxed(val, tmu->tmu_base + TER); |
| |
| /* disable TMU clk */ |
| clk_disable_unprepare(tmu->clk); |
| |
| iounmap(tmu->tmu_base); |
| |
| return 0; |
| } |
| |
| static struct platform_driver imx8mm_tmu = { |
| .driver = { |
| .name = "i.mx8mm_thermal", |
| .of_match_table = imx8mm_tmu_table, |
| }, |
| .probe = imx8mm_tmu_probe, |
| .remove = imx8mm_tmu_remove, |
| }; |
| module_platform_driver(imx8mm_tmu); |
| |
| MODULE_AUTHOR("Jacky Bai <ping.bai@nxp.com>"); |
| MODULE_DESCRIPTION("i.MX8MM Thermal Monitor Unit driver"); |
| MODULE_LICENSE("GPL v2"); |