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path: root/drivers/thermal/imx8mm_thermal.c
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Diffstat (limited to 'drivers/thermal/imx8mm_thermal.c')
-rw-r--r--drivers/thermal/imx8mm_thermal.c247
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");