diff options
Diffstat (limited to 'drivers/thermal/imx8mm_thermal.c')
| -rw-r--r-- | drivers/thermal/imx8mm_thermal.c | 237 |
1 files changed, 237 insertions, 0 deletions
diff --git a/drivers/thermal/imx8mm_thermal.c b/drivers/thermal/imx8mm_thermal.c new file mode 100644 index 000000000000..e6026f13c12f --- /dev/null +++ b/drivers/thermal/imx8mm_thermal.c @@ -0,0 +1,237 @@ +// 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 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); + + if (!(val & TRITSR_VALID)) + return -EAGAIN; + + *temp = (val & TEMP_VAL_MASK) * 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"); |