diff options
Diffstat (limited to 'drivers/thermal/imx8mm_thermal.c')
| -rw-r--r-- | drivers/thermal/imx8mm_thermal.c | 247 |
1 files changed, 247 insertions, 0 deletions
diff --git a/drivers/thermal/imx8mm_thermal.c b/drivers/thermal/imx8mm_thermal.c new file mode 100644 index 000000000..258d988b2 --- /dev/null +++ b/drivers/thermal/imx8mm_thermal.c @@ -0,0 +1,247 @@ +// 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_ADC_PD BIT(30) +#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[]; +}; + +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; + + /* + * Do not validate against the V bit (bit 31) due to errata + * ERR051272: TMU: Bit 31 of registers TMU_TSCR/TMU_TRITSR/TMU_TRATSR invalid + */ + + *temp = val * 1000; + if (*temp < VER1_TEMP_LOW_LIMIT || *temp > VER2_TEMP_HIGH_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(struct thermal_zone_device *tz, int *temp) +{ + struct tmu_sensor *sensor = tz->devdata; + struct imx8mm_tmu *tmu = sensor->priv; + + return tmu->socdata->get_temp(sensor, temp); +} + +static const struct thermal_zone_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); + if (tmu->socdata->version == TMU_VER2) + val = enable ? (val & ~TER_ADC_PD) : (val | TER_ADC_PD); + 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)) + return dev_err_probe(&pdev->dev, PTR_ERR(tmu->clk), + "failed to get tmu clock\n"); + + 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_of_zone_register(&pdev->dev, i, + &tmu->sensors[i], + &tmu_tz_ops); + if (IS_ERR(tmu->sensors[i].tzd)) { + ret = PTR_ERR(tmu->sensors[i].tzd); + dev_err(&pdev->dev, + "failed to register thermal zone sensor[%d]: %d\n", + i, ret); + goto disable_clk; + } + 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; + +disable_clk: + clk_disable_unprepare(tmu->clk); + return ret; +} + +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, }, + { }, +}; +MODULE_DEVICE_TABLE(of, imx8mm_tmu_table); + +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"); |