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238 lines
5.3 KiB
238 lines
5.3 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* Copyright 2020 NXP. |
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* |
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* Author: Anson Huang <[email protected]> |
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*/ |
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#include <linux/bitfield.h> |
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#include <linux/clk.h> |
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#include <linux/err.h> |
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#include <linux/io.h> |
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#include <linux/module.h> |
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#include <linux/of.h> |
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#include <linux/of_device.h> |
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#include <linux/platform_device.h> |
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#include <linux/thermal.h> |
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#include "thermal_core.h" |
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#define TER 0x0 /* TMU enable */ |
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#define TPS 0x4 |
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#define TRITSR 0x20 /* TMU immediate temp */ |
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#define TER_EN BIT(31) |
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#define TRITSR_TEMP0_VAL_MASK 0xff |
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#define TRITSR_TEMP1_VAL_MASK 0xff0000 |
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#define PROBE_SEL_ALL GENMASK(31, 30) |
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#define probe_status_offset(x) (30 + x) |
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#define SIGN_BIT BIT(7) |
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#define TEMP_VAL_MASK GENMASK(6, 0) |
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#define VER1_TEMP_LOW_LIMIT 10000 |
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#define VER2_TEMP_LOW_LIMIT -40000 |
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#define VER2_TEMP_HIGH_LIMIT 125000 |
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#define TMU_VER1 0x1 |
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#define TMU_VER2 0x2 |
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struct thermal_soc_data { |
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u32 num_sensors; |
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u32 version; |
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int (*get_temp)(void *, int *); |
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}; |
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struct tmu_sensor { |
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struct imx8mm_tmu *priv; |
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u32 hw_id; |
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struct thermal_zone_device *tzd; |
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}; |
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struct imx8mm_tmu { |
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void __iomem *base; |
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struct clk *clk; |
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const struct thermal_soc_data *socdata; |
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struct tmu_sensor sensors[]; |
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}; |
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static int imx8mm_tmu_get_temp(void *data, int *temp) |
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{ |
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struct tmu_sensor *sensor = data; |
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struct imx8mm_tmu *tmu = sensor->priv; |
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u32 val; |
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val = readl_relaxed(tmu->base + TRITSR) & TRITSR_TEMP0_VAL_MASK; |
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*temp = val * 1000; |
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if (*temp < VER1_TEMP_LOW_LIMIT) |
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return -EAGAIN; |
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return 0; |
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} |
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static int imx8mp_tmu_get_temp(void *data, int *temp) |
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{ |
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struct tmu_sensor *sensor = data; |
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struct imx8mm_tmu *tmu = sensor->priv; |
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unsigned long val; |
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bool ready; |
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val = readl_relaxed(tmu->base + TRITSR); |
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ready = test_bit(probe_status_offset(sensor->hw_id), &val); |
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if (!ready) |
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return -EAGAIN; |
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val = sensor->hw_id ? FIELD_GET(TRITSR_TEMP1_VAL_MASK, val) : |
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FIELD_GET(TRITSR_TEMP0_VAL_MASK, val); |
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if (val & SIGN_BIT) /* negative */ |
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val = (~(val & TEMP_VAL_MASK) + 1); |
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*temp = val * 1000; |
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if (*temp < VER2_TEMP_LOW_LIMIT || *temp > VER2_TEMP_HIGH_LIMIT) |
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return -EAGAIN; |
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return 0; |
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} |
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static int tmu_get_temp(void *data, int *temp) |
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{ |
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struct tmu_sensor *sensor = data; |
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struct imx8mm_tmu *tmu = sensor->priv; |
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return tmu->socdata->get_temp(data, temp); |
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} |
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static struct thermal_zone_of_device_ops tmu_tz_ops = { |
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.get_temp = tmu_get_temp, |
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}; |
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static void imx8mm_tmu_enable(struct imx8mm_tmu *tmu, bool enable) |
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{ |
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u32 val; |
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val = readl_relaxed(tmu->base + TER); |
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val = enable ? (val | TER_EN) : (val & ~TER_EN); |
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writel_relaxed(val, tmu->base + TER); |
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} |
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static void imx8mm_tmu_probe_sel_all(struct imx8mm_tmu *tmu) |
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{ |
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u32 val; |
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val = readl_relaxed(tmu->base + TPS); |
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val |= PROBE_SEL_ALL; |
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writel_relaxed(val, tmu->base + TPS); |
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} |
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static int imx8mm_tmu_probe(struct platform_device *pdev) |
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{ |
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const struct thermal_soc_data *data; |
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struct imx8mm_tmu *tmu; |
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int ret; |
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int i; |
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data = of_device_get_match_data(&pdev->dev); |
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tmu = devm_kzalloc(&pdev->dev, struct_size(tmu, sensors, |
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data->num_sensors), GFP_KERNEL); |
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if (!tmu) |
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return -ENOMEM; |
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tmu->socdata = data; |
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tmu->base = devm_platform_ioremap_resource(pdev, 0); |
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if (IS_ERR(tmu->base)) |
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return PTR_ERR(tmu->base); |
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tmu->clk = devm_clk_get(&pdev->dev, NULL); |
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if (IS_ERR(tmu->clk)) |
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return dev_err_probe(&pdev->dev, PTR_ERR(tmu->clk), |
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"failed to get tmu clock\n"); |
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ret = clk_prepare_enable(tmu->clk); |
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if (ret) { |
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dev_err(&pdev->dev, "failed to enable tmu clock: %d\n", ret); |
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return ret; |
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} |
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/* disable the monitor during initialization */ |
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imx8mm_tmu_enable(tmu, false); |
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for (i = 0; i < data->num_sensors; i++) { |
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tmu->sensors[i].priv = tmu; |
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tmu->sensors[i].tzd = |
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devm_thermal_zone_of_sensor_register(&pdev->dev, i, |
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&tmu->sensors[i], |
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&tmu_tz_ops); |
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if (IS_ERR(tmu->sensors[i].tzd)) { |
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ret = PTR_ERR(tmu->sensors[i].tzd); |
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dev_err(&pdev->dev, |
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"failed to register thermal zone sensor[%d]: %d\n", |
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i, ret); |
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goto disable_clk; |
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} |
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tmu->sensors[i].hw_id = i; |
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} |
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platform_set_drvdata(pdev, tmu); |
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/* enable all the probes for V2 TMU */ |
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if (tmu->socdata->version == TMU_VER2) |
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imx8mm_tmu_probe_sel_all(tmu); |
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/* enable the monitor */ |
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imx8mm_tmu_enable(tmu, true); |
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return 0; |
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disable_clk: |
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clk_disable_unprepare(tmu->clk); |
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return ret; |
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} |
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static int imx8mm_tmu_remove(struct platform_device *pdev) |
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{ |
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struct imx8mm_tmu *tmu = platform_get_drvdata(pdev); |
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/* disable TMU */ |
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imx8mm_tmu_enable(tmu, false); |
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clk_disable_unprepare(tmu->clk); |
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platform_set_drvdata(pdev, NULL); |
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return 0; |
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} |
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static struct thermal_soc_data imx8mm_tmu_data = { |
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.num_sensors = 1, |
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.version = TMU_VER1, |
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.get_temp = imx8mm_tmu_get_temp, |
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}; |
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static struct thermal_soc_data imx8mp_tmu_data = { |
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.num_sensors = 2, |
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.version = TMU_VER2, |
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.get_temp = imx8mp_tmu_get_temp, |
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}; |
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static const struct of_device_id imx8mm_tmu_table[] = { |
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{ .compatible = "fsl,imx8mm-tmu", .data = &imx8mm_tmu_data, }, |
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{ .compatible = "fsl,imx8mp-tmu", .data = &imx8mp_tmu_data, }, |
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{ }, |
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}; |
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MODULE_DEVICE_TABLE(of, imx8mm_tmu_table); |
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static struct platform_driver imx8mm_tmu = { |
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.driver = { |
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.name = "i.mx8mm_thermal", |
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.of_match_table = imx8mm_tmu_table, |
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}, |
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.probe = imx8mm_tmu_probe, |
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.remove = imx8mm_tmu_remove, |
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}; |
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module_platform_driver(imx8mm_tmu); |
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MODULE_AUTHOR("Anson Huang <[email protected]>"); |
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MODULE_DESCRIPTION("i.MX8MM Thermal Monitor Unit driver"); |
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MODULE_LICENSE("GPL v2");
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