| // SPDX-License-Identifier: GPL-2.0 |
| /* |
| * Copyright 2020 NXP. |
| * |
| * Author: Anson Huang <Anson.Huang@nxp.com> |
| */ |
| |
| #include <linux/bitfield.h> |
| #include <linux/clk.h> |
| #include <linux/err.h> |
| #include <linux/io.h> |
| #include <linux/module.h> |
| #include <linux/of.h> |
| #include <linux/of_device.h> |
| #include <linux/platform_device.h> |
| #include <linux/thermal.h> |
| |
| #include "thermal_core.h" |
| |
| #define TER 0x0 /* TMU enable */ |
| #define TPS 0x4 |
| #define TRITSR 0x20 /* TMU immediate temp */ |
| |
| #define TER_EN BIT(31) |
| #define TRITSR_TEMP0_VAL_MASK 0xff |
| #define TRITSR_TEMP1_VAL_MASK 0xff0000 |
| |
| #define PROBE_SEL_ALL GENMASK(31, 30) |
| |
| #define probe_status_offset(x) (30 + x) |
| #define SIGN_BIT BIT(7) |
| #define TEMP_VAL_MASK GENMASK(6, 0) |
| |
| #define VER1_TEMP_LOW_LIMIT 10000 |
| #define VER2_TEMP_LOW_LIMIT -40000 |
| #define VER2_TEMP_HIGH_LIMIT 125000 |
| |
| #define TMU_VER1 0x1 |
| #define TMU_VER2 0x2 |
| |
| struct thermal_soc_data { |
| u32 num_sensors; |
| u32 version; |
| int (*get_temp)(void *, int *); |
| }; |
| |
| struct tmu_sensor { |
| struct imx8mm_tmu *priv; |
| u32 hw_id; |
| struct thermal_zone_device *tzd; |
| }; |
| |
| struct imx8mm_tmu { |
| void __iomem *base; |
| struct clk *clk; |
| const struct thermal_soc_data *socdata; |
| struct tmu_sensor sensors[0]; |
| }; |
| |
| static int imx8mm_tmu_get_temp(void *data, int *temp) |
| { |
| struct tmu_sensor *sensor = data; |
| struct imx8mm_tmu *tmu = sensor->priv; |
| u32 val; |
| |
| val = readl_relaxed(tmu->base + TRITSR) & TRITSR_TEMP0_VAL_MASK; |
| *temp = val * 1000; |
| if (*temp < VER1_TEMP_LOW_LIMIT) |
| return -EAGAIN; |
| |
| return 0; |
| } |
| |
| static int imx8mp_tmu_get_temp(void *data, int *temp) |
| { |
| struct tmu_sensor *sensor = data; |
| struct imx8mm_tmu *tmu = sensor->priv; |
| unsigned long val; |
| bool ready; |
| |
| val = readl_relaxed(tmu->base + TRITSR); |
| ready = test_bit(probe_status_offset(sensor->hw_id), &val); |
| if (!ready) |
| return -EAGAIN; |
| |
| val = sensor->hw_id ? FIELD_GET(TRITSR_TEMP1_VAL_MASK, val) : |
| FIELD_GET(TRITSR_TEMP0_VAL_MASK, val); |
| if (val & SIGN_BIT) /* negative */ |
| val = (~(val & TEMP_VAL_MASK) + 1); |
| |
| *temp = val * 1000; |
| if (*temp < VER2_TEMP_LOW_LIMIT || *temp > VER2_TEMP_HIGH_LIMIT) |
| return -EAGAIN; |
| |
| return 0; |
| } |
| |
| static int tmu_get_temp(void *data, int *temp) |
| { |
| struct tmu_sensor *sensor = data; |
| struct imx8mm_tmu *tmu = sensor->priv; |
| |
| return tmu->socdata->get_temp(data, temp); |
| } |
| |
| static struct thermal_zone_of_device_ops tmu_tz_ops = { |
| .get_temp = tmu_get_temp, |
| }; |
| |
| static void imx8mm_tmu_enable(struct imx8mm_tmu *tmu, bool enable) |
| { |
| u32 val; |
| |
| val = readl_relaxed(tmu->base + TER); |
| val = enable ? (val | TER_EN) : (val & ~TER_EN); |
| writel_relaxed(val, tmu->base + TER); |
| } |
| |
| static void imx8mm_tmu_probe_sel_all(struct imx8mm_tmu *tmu) |
| { |
| u32 val; |
| |
| val = readl_relaxed(tmu->base + TPS); |
| val |= PROBE_SEL_ALL; |
| writel_relaxed(val, tmu->base + TPS); |
| } |
| |
| static int imx8mm_tmu_probe(struct platform_device *pdev) |
| { |
| const struct thermal_soc_data *data; |
| struct imx8mm_tmu *tmu; |
| int ret; |
| int i; |
| |
| data = of_device_get_match_data(&pdev->dev); |
| |
| tmu = devm_kzalloc(&pdev->dev, struct_size(tmu, sensors, |
| data->num_sensors), GFP_KERNEL); |
| if (!tmu) |
| return -ENOMEM; |
| |
| tmu->socdata = data; |
| |
| tmu->base = devm_platform_ioremap_resource(pdev, 0); |
| if (IS_ERR(tmu->base)) |
| return PTR_ERR(tmu->base); |
| |
| tmu->clk = devm_clk_get(&pdev->dev, NULL); |
| if (IS_ERR(tmu->clk)) { |
| ret = PTR_ERR(tmu->clk); |
| if (ret != -EPROBE_DEFER) |
| dev_err(&pdev->dev, |
| "failed to get tmu clock: %d\n", ret); |
| return ret; |
| } |
| |
| ret = clk_prepare_enable(tmu->clk); |
| if (ret) { |
| dev_err(&pdev->dev, "failed to enable tmu clock: %d\n", ret); |
| return ret; |
| } |
| |
| /* disable the monitor during initialization */ |
| imx8mm_tmu_enable(tmu, false); |
| |
| for (i = 0; i < data->num_sensors; i++) { |
| tmu->sensors[i].priv = tmu; |
| tmu->sensors[i].tzd = |
| devm_thermal_zone_of_sensor_register(&pdev->dev, i, |
| &tmu->sensors[i], |
| &tmu_tz_ops); |
| if (IS_ERR(tmu->sensors[i].tzd)) { |
| dev_err(&pdev->dev, |
| "failed to register thermal zone sensor[%d]: %d\n", |
| i, ret); |
| return PTR_ERR(tmu->sensors[i].tzd); |
| } |
| tmu->sensors[i].hw_id = i; |
| } |
| |
| platform_set_drvdata(pdev, tmu); |
| |
| /* enable all the probes for V2 TMU */ |
| if (tmu->socdata->version == TMU_VER2) |
| imx8mm_tmu_probe_sel_all(tmu); |
| |
| /* enable the monitor */ |
| imx8mm_tmu_enable(tmu, true); |
| |
| return 0; |
| } |
| |
| static int imx8mm_tmu_remove(struct platform_device *pdev) |
| { |
| struct imx8mm_tmu *tmu = platform_get_drvdata(pdev); |
| |
| /* disable TMU */ |
| imx8mm_tmu_enable(tmu, false); |
| |
| clk_disable_unprepare(tmu->clk); |
| platform_set_drvdata(pdev, NULL); |
| |
| return 0; |
| } |
| |
| static struct thermal_soc_data imx8mm_tmu_data = { |
| .num_sensors = 1, |
| .version = TMU_VER1, |
| .get_temp = imx8mm_tmu_get_temp, |
| }; |
| |
| static struct thermal_soc_data imx8mp_tmu_data = { |
| .num_sensors = 2, |
| .version = TMU_VER2, |
| .get_temp = imx8mp_tmu_get_temp, |
| }; |
| |
| static const struct of_device_id imx8mm_tmu_table[] = { |
| { .compatible = "fsl,imx8mm-tmu", .data = &imx8mm_tmu_data, }, |
| { .compatible = "fsl,imx8mp-tmu", .data = &imx8mp_tmu_data, }, |
| { }, |
| }; |
| |
| 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("Anson Huang <Anson.Huang@nxp.com>"); |
| MODULE_DESCRIPTION("i.MX8MM Thermal Monitor Unit driver"); |
| MODULE_LICENSE("GPL v2"); |