From: Pengfei Li <pengfei.li_1@xxxxxxx>
Introduce support for the i.MX91 thermal monitoring unit, which features a
single sensor for the CPU. The register layout differs from other chips,
necessitating the creation of a dedicated file for this.
Signed-off-by: Pengfei Li <pengfei.li_1@xxxxxxx>
Signed-off-by: Peng Fan <peng.fan@xxxxxxx>
Reviewed-by: Marco Felsch <m.felsch@xxxxxxxxxxxxxx>
Signed-off-by: Frank Li <Frank.Li@xxxxxxx>
---
Change from v3 to v4
- Add Macro's review tag
- Use devm_add_action()
- Move pm_runtim_put before thermal_of_zone_register()
change from v2 to v3
- add IMX91_TMU_ prefix for register define
- remove unused register define
- fix missed pm_runtime_put() at error path in imx91_tmu_get_temp()
- use dev variable in probe function
- use pm_runtime_set_active() in probe
- move START to imx91_tmu_get_temp()
- use DEFINE_RUNTIME_DEV_PM_OPS()
- keep set reset value because there are not sw "reset" bit in controller,
uboot may change and enable tmu.
change from v1 to v2
- use low case for hexvalue
- combine struct imx91_tmu and tmu_sensor
- simplify imx91_tmu_start() and imx91_tmu_enable()
- use s16 for imx91_tmu_get_temp(), which may negative value
- use reverse christmas tree style
- use run time pm
- use oneshot to sample temp
- register thermal zone after hardware init
---
drivers/thermal/Kconfig | 10 ++
drivers/thermal/Makefile | 1 +
drivers/thermal/imx91_thermal.c | 263 ++++++++++++++++++++++++++++++++++++++++
3 files changed, 274 insertions(+)
diff --git a/drivers/thermal/Kconfig b/drivers/thermal/Kconfig
index d3f9686e26e71..da403ed86aeb1 100644
--- a/drivers/thermal/Kconfig
+++ b/drivers/thermal/Kconfig
@@ -296,6 +296,16 @@ config IMX8MM_THERMAL
cpufreq is used as the cooling device to throttle CPUs when the passive
trip is crossed.
+config IMX91_THERMAL
+ tristate "Temperature sensor driver for NXP i.MX91 SoC"
+ depends on ARCH_MXC || COMPILE_TEST
+ depends on OF
+ help
+ Support for Temperature sensor found on NXP i.MX91 SoC.
+ It supports one critical trip point and one passive trip point. The
+ cpufreq is used as the cooling device to throttle CPUs when the passive
+ trip is crossed.
+
config K3_THERMAL
tristate "Texas Instruments K3 thermal support"
depends on ARCH_K3 || COMPILE_TEST
diff --git a/drivers/thermal/Makefile b/drivers/thermal/Makefile
index 9abf43a74f2bb..08da241e6a598 100644
--- a/drivers/thermal/Makefile
+++ b/drivers/thermal/Makefile
@@ -50,6 +50,7 @@ obj-$(CONFIG_ARMADA_THERMAL) += armada_thermal.o
obj-$(CONFIG_IMX_THERMAL) += imx_thermal.o
obj-$(CONFIG_IMX_SC_THERMAL) += imx_sc_thermal.o
obj-$(CONFIG_IMX8MM_THERMAL) += imx8mm_thermal.o
+obj-$(CONFIG_IMX91_THERMAL) += imx91_thermal.o
obj-$(CONFIG_MAX77620_THERMAL) += max77620_thermal.o
obj-$(CONFIG_QORIQ_THERMAL) += qoriq_thermal.o
obj-$(CONFIG_DA9062_THERMAL) += da9062-thermal.o
diff --git a/drivers/thermal/imx91_thermal.c b/drivers/thermal/imx91_thermal.c
new file mode 100644
index 0000000000000..ef5e8e181dd0f
--- /dev/null
+++ b/drivers/thermal/imx91_thermal.c
@@ -0,0 +1,263 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright 2024 NXP.
+ */
+
+#include <linux/bitfield.h>
+#include <linux/clk.h>
+#include <linux/err.h>
+#include <linux/iopoll.h>
+#include <linux/nvmem-consumer.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
+#include <linux/thermal.h>
+
+#define IMX91_TMU_STAT0 0x10
+#define IMX91_TMU_STAT0_DRDY0_IF_MASK BIT(16)
+
+#define IMX91_TMU_DATA0 0x20
+
+#define IMX91_TMU_CTRL1_SET 0x204
+#define IMX91_TMU_CTRL1_CLR 0x208
+#define IMX91_TMU_CTRL1_EN BIT(31)
+#define IMX91_TMU_CTRL1_START BIT(30)
+#define IMX91_TMU_CTRL1_STOP BIT(29)
+#define IMX91_TMU_CTRL1_RES_MASK GENMASK(19, 18)
+#define IMX91_TMU_CTRL1_MEAS_MODE_MASK GENMASK(25, 24)
+#define IMX91_TMU_CTRL1_MEAS_MODE_SINGLE 0
+#define IMX91_TMU_CTRL1_MEAS_MODE_CONTINUES 1
+#define IMX91_TMU_CTRL1_MEAS_MODE_PERIODIC 2
+
+#define IMX91_TMU_REF_DIV 0x280
+#define IMX91_TMU_DIV_EN BIT(31)
+#define IMX91_TMU_DIV_MASK GENMASK(23, 16)
+#define IMX91_TMU_DIV_MAX 255
+
+#define IMX91_TMU_PUD_ST_CTRL 0x2b0
+#define IMX91_TMU_PUDL_MASK GENMASK(23, 16)
+
+#define IMX91_TMU_TRIM1 0x2e0
+#define IMX91_TMU_TRIM2 0x2f0
+
+#define IMX91_TMU_TEMP_LOW_LIMIT -40000
+#define IMX91_TMU_TEMP_HIGH_LIMIT 125000
+
+#define IMX91_TMU_DEFAULT_TRIM1_CONFIG 0xb561bc2d
+#define IMX91_TMU_DEFAULT_TRIM2_CONFIG 0x65d4
+
+struct imx91_tmu {
+ void __iomem *base;
+ struct clk *clk;
+ struct device *dev;
+ struct thermal_zone_device *tzd;
+};
+
+static void imx91_tmu_start(struct imx91_tmu *tmu, bool start)
+{
+ u32 val = start ? IMX91_TMU_CTRL1_START : IMX91_TMU_CTRL1_STOP;
+
+ writel_relaxed(val, tmu->base + IMX91_TMU_CTRL1_SET);
+}
+
+static void imx91_tmu_enable(struct imx91_tmu *tmu, bool enable)
+{
+ u32 reg = enable ? IMX91_TMU_CTRL1_SET : IMX91_TMU_CTRL1_CLR;
+
+ writel_relaxed(IMX91_TMU_CTRL1_EN, tmu->base + reg);
+}
+
+static int imx91_tmu_get_temp(struct thermal_zone_device *tz, int *temp)
+{
+ struct imx91_tmu *tmu = thermal_zone_device_priv(tz);
+ s16 data;
+ int ret;
+ u32 val;
+
+ ret = pm_runtime_resume_and_get(tmu->dev);
+ if (ret < 0)
+ return ret;
+
+ imx91_tmu_start(tmu, true);
+
+ ret = readl_relaxed_poll_timeout(tmu->base + IMX91_TMU_STAT0, val,
+ val & IMX91_TMU_STAT0_DRDY0_IF_MASK, 1000, 40000);
+ if (ret) {
+ ret = -EAGAIN;
+ goto out;
+ }
+
+ /* DATA0 is 16bit signed number */
+ data = readw_relaxed(tmu->base + IMX91_TMU_DATA0);
+ *temp = data * 1000 / 64;
+ if (*temp < IMX91_TMU_TEMP_LOW_LIMIT || *temp > IMX91_TMU_TEMP_HIGH_LIMIT)
+ ret = -EAGAIN;
+
+out:
+ pm_runtime_put(tmu->dev);
+
+ return ret;
+}
+
+static struct thermal_zone_device_ops tmu_tz_ops = {
+ .get_temp = imx91_tmu_get_temp,
+};
+
+static int imx91_init_from_nvmem_cells(struct imx91_tmu *tmu)
+{
+ struct device *dev = tmu->dev;
+ u32 trim1, trim2;
+ int ret;
+
+ ret = nvmem_cell_read_u32(dev, "trim1", &trim1);
+ if (ret)
+ return ret;
+
+ ret = nvmem_cell_read_u32(dev, "trim2", &trim2);
+ if (ret)
+ return ret;
+
+ if (trim1 == 0 || trim2 == 0)
+ return -EINVAL;
+
+ writel_relaxed(trim1, tmu->base + IMX91_TMU_TRIM1);
+ writel_relaxed(trim2, tmu->base + IMX91_TMU_TRIM2);
+
+ return 0;
+}
+
+static void imx91_tmu_action_remove(void *data)
+{
+ struct imx91_tmu *tmu = data;
+
+ /* disable tmu */
+ imx91_tmu_enable(tmu, false);
+}
+
+static int imx91_tmu_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct imx91_tmu *tmu;
+ unsigned long rate;
+ u32 div;
+ int ret;
+
+ tmu = devm_kzalloc(dev, sizeof(struct imx91_tmu), GFP_KERNEL);
+ if (!tmu)
+ return -ENOMEM;
+
+ tmu->dev = dev;
+
+ tmu->base = devm_platform_ioremap_resource(pdev, 0);
+ if (IS_ERR(tmu->base))
+ return dev_err_probe(dev, PTR_ERR(tmu->base), "failed to get io resource");
+
+ tmu->clk = devm_clk_get_enabled(dev, NULL);
+ if (IS_ERR(tmu->clk))
+ return dev_err_probe(dev, PTR_ERR(tmu->clk), "failed to get tmu clock\n");
+
+ platform_set_drvdata(pdev, tmu);
+
+ /* disable the monitor during initialization */
+ imx91_tmu_enable(tmu, false);
+ imx91_tmu_start(tmu, false);
+
+ ret = imx91_init_from_nvmem_cells(tmu);
+ if (ret) {
+ writel_relaxed(IMX91_TMU_DEFAULT_TRIM1_CONFIG, tmu->base + IMX91_TMU_TRIM1);
+ writel_relaxed(IMX91_TMU_DEFAULT_TRIM2_CONFIG, tmu->base + IMX91_TMU_TRIM2);
+ }
+
+ /* The typical conv clk is 4MHz, the output freq is 'rate / (div + 1)' */
+ rate = clk_get_rate(tmu->clk);
+ div = (rate / 4000000) - 1;
+ if (div > IMX91_TMU_DIV_MAX)
+ return dev_err_probe(dev, -EINVAL, "clock divider exceed hardware limitation");
+
+ /* Set divider value and enable divider */
+ writel_relaxed(IMX91_TMU_DIV_EN | FIELD_PREP(IMX91_TMU_DIV_MASK, div),
+ tmu->base + IMX91_TMU_REF_DIV);
+
+ /* Set max power up delay: 'Tpud(ms) = 0xFF * 1000 / 4000000' */
+ writel_relaxed(FIELD_PREP(IMX91_TMU_PUDL_MASK, 100U), tmu->base + IMX91_TMU_PUD_ST_CTRL);
+
+ /*
+ * Set resolution mode
+ * 00b - Conversion time = 0.59325 ms
+ * 01b - Conversion time = 1.10525 ms
+ * 10b - Conversion time = 2.12925 ms
+ * 11b - Conversion time = 4.17725 ms
+ */
+ writel_relaxed(FIELD_PREP(IMX91_TMU_CTRL1_RES_MASK, 0x3), tmu->base + IMX91_TMU_CTRL1_CLR);
+ writel_relaxed(FIELD_PREP(IMX91_TMU_CTRL1_RES_MASK, 0x1), tmu->base + IMX91_TMU_CTRL1_SET);
+
+ writel_relaxed(IMX91_TMU_CTRL1_MEAS_MODE_MASK, tmu->base + IMX91_TMU_CTRL1_CLR);
+ writel_relaxed(FIELD_PREP(IMX91_TMU_CTRL1_MEAS_MODE_MASK, IMX91_TMU_CTRL1_MEAS_MODE_SINGLE),
+ tmu->base + IMX91_TMU_CTRL1_SET);
+
+ pm_runtime_set_active(dev);
+ devm_pm_runtime_enable(dev);
+ pm_runtime_put(dev);
+
+ tmu->tzd = devm_thermal_of_zone_register(dev, 0, tmu, &tmu_tz_ops);
+ if (IS_ERR(tmu->tzd))
+ return dev_err_probe(dev, PTR_ERR(tmu->tzd),
+ "failed to register thermal zone sensor\n");
+
+ ret = devm_add_action(dev, imx91_tmu_action_remove, tmu);
+ if (ret)
+ return dev_err_probe(dev, ret, "Failure to add action imx91_tmu_action_remove()\n");
+
+ return 0;
+}
+
+static int imx91_tmu_runtime_suspend(struct device *dev)
+{
+ struct imx91_tmu *tmu = dev_get_drvdata(dev);
+
+ /* disable tmu */
+ imx91_tmu_enable(tmu, false);
+
+ clk_disable_unprepare(tmu->clk);
+
+ return 0;
+}
+
+static int imx91_tmu_runtime_resume(struct device *dev)
+{
+ struct imx91_tmu *tmu = dev_get_drvdata(dev);
+ int ret;
+
+ ret = clk_prepare_enable(tmu->clk);
+ if (ret)
+ return ret;
+
+ imx91_tmu_enable(tmu, true);
+
+ return 0;
+}
+
+static DEFINE_RUNTIME_DEV_PM_OPS(imx91_tmu_pm_ops, imx91_tmu_runtime_suspend,
+ imx91_tmu_runtime_resume, NULL);
+
+static const struct of_device_id imx91_tmu_table[] = {
+ { .compatible = "fsl,imx91-tmu", },
+ { },
+};
+MODULE_DEVICE_TABLE(of, imx91_tmu_table);
+
+static struct platform_driver imx91_tmu = {
+ .driver = {
+ .name = "imx91_thermal",
+ .pm = pm_ptr(&imx91_tmu_pm_ops),
+ .of_match_table = imx91_tmu_table,
+ },
+ .probe = imx91_tmu_probe,
+};
+module_platform_driver(imx91_tmu);
+
+MODULE_AUTHOR("Peng Fan <peng.fan@xxxxxxx>");
+MODULE_DESCRIPTION("i.MX91 Thermal Monitor Unit driver");
+MODULE_LICENSE("GPL");
--
2.34.1
