Add i.MX8 thermal driver to support get temperature from SCU.
Signed-off-by: Peng Fan peng.fan@nxp.com --- drivers/thermal/Kconfig | 9 ++ drivers/thermal/Makefile | 1 + drivers/thermal/imx_scu_thermal.c | 203 ++++++++++++++++++++++++++++++++++++++ 3 files changed, 213 insertions(+) create mode 100644 drivers/thermal/imx_scu_thermal.c
diff --git a/drivers/thermal/Kconfig b/drivers/thermal/Kconfig index a71b9be5fb..bdf8dc6fef 100644 --- a/drivers/thermal/Kconfig +++ b/drivers/thermal/Kconfig @@ -17,6 +17,15 @@ config IMX_THERMAL cpufreq is used as the cooling device to throttle CPUs when the passive trip is crossed.
+config IMX_SCU_THERMAL + bool "Temperature sensor driver for NXP i.MX8" + depends on ARCH_IMX8 + help + Support for Temperature sensors on NXP i.MX8. + It supports one critical trip point and one passive trip point. The + boot is hold to the cool device to throttle CPUs when the passive + trip is crossed + config TI_DRA7_THERMAL bool "Temperature sensor driver for TI dra7xx SOCs" help diff --git a/drivers/thermal/Makefile b/drivers/thermal/Makefile index cc75e387e4..ef2929d180 100644 --- a/drivers/thermal/Makefile +++ b/drivers/thermal/Makefile @@ -5,4 +5,5 @@
obj-$(CONFIG_DM_THERMAL) += thermal-uclass.o obj-$(CONFIG_IMX_THERMAL) += imx_thermal.o +obj-$(CONFIG_IMX_SCU_THERMAL) += imx_scu_thermal.o obj-$(CONFIG_TI_DRA7_THERMAL) += ti-bandgap.o diff --git a/drivers/thermal/imx_scu_thermal.c b/drivers/thermal/imx_scu_thermal.c new file mode 100644 index 0000000000..7e17377b69 --- /dev/null +++ b/drivers/thermal/imx_scu_thermal.c @@ -0,0 +1,203 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Copyright 2019 NXP + */ + +#include <config.h> +#include <common.h> +#include <dm.h> +#include <errno.h> +#include <thermal.h> +#include <dm/device-internal.h> +#include <dm/device.h> +#include <asm/arch/sci/sci.h> + +DECLARE_GLOBAL_DATA_PTR; + +struct imx_sc_thermal_plat { + int critical; + int alert; + int polling_delay; + int id; + bool zone_node; +}; + +static int read_temperature(struct udevice *dev, int *temp) +{ + s16 celsius; + s8 tenths; + int ret; + + sc_rsrc_t *sensor_rsrc = (sc_rsrc_t *)dev_get_driver_data(dev); + + struct imx_sc_thermal_plat *pdata = dev_get_platdata(dev); + + if (!temp) + return -EINVAL; + + ret = sc_misc_get_temp(-1, sensor_rsrc[pdata->id], SC_C_TEMP, + &celsius, &tenths); + if (ret) { + printf("Error: get temperature failed! (error = %d)\n", ret); + return ret; + } + + *temp = celsius * 1000 + tenths * 100; + + return 0; +} + +int imx_sc_thermal_get_temp(struct udevice *dev, int *temp) +{ + struct imx_sc_thermal_plat *pdata = dev_get_platdata(dev); + int cpu_temp = 0; + int ret; + + ret = read_temperature(dev, &cpu_temp); + if (ret) + return ret; + + while (cpu_temp >= pdata->alert) { + printf("CPU Temperature (%dC) has beyond alert (%dC), close to critical (%dC)", + cpu_temp, pdata->alert, pdata->critical); + puts(" waiting...\n"); + mdelay(pdata->polling_delay); + ret = read_temperature(dev, &cpu_temp); + if (ret) + return ret; + } + + *temp = cpu_temp / 1000; + + return 0; +} + +static const struct dm_thermal_ops imx_sc_thermal_ops = { + .get_temp = imx_sc_thermal_get_temp, +}; + +static int imx_sc_thermal_probe(struct udevice *dev) +{ + debug("%s dev name %s\n", __func__, dev->name); + return 0; +} + +static int imx_sc_thermal_bind(struct udevice *dev) +{ + struct imx_sc_thermal_plat *pdata = dev_get_platdata(dev); + int reg, ret; + int offset; + const char *name; + const void *prop; + + debug("%s dev name %s\n", __func__, dev->name); + + prop = fdt_getprop(gd->fdt_blob, dev_of_offset(dev), "compatible", + NULL); + if (!prop) + return 0; + + pdata->zone_node = 1; + + reg = fdtdec_get_int(gd->fdt_blob, dev_of_offset(dev), "tsens-num", 0); + if (reg == 0) { + printf("%s: no temp sensor number provided!\n", __func__); + return -EINVAL; + } + + offset = fdt_subnode_offset(gd->fdt_blob, 0, "thermal-zones"); + fdt_for_each_subnode(offset, gd->fdt_blob, offset) { + /* Bind the subnode to this driver */ + name = fdt_get_name(gd->fdt_blob, offset, NULL); + + ret = device_bind_with_driver_data(dev, dev->driver, name, + dev->driver_data, + offset_to_ofnode(offset), + NULL); + if (ret) + printf("Error binding driver '%s': %d\n", + dev->driver->name, ret); + } + return 0; +} + +static int imx_sc_thermal_ofdata_to_platdata(struct udevice *dev) +{ + struct imx_sc_thermal_plat *pdata = dev_get_platdata(dev); + struct fdtdec_phandle_args args; + const char *type; + int ret; + int trips_np; + + debug("%s dev name %s\n", __func__, dev->name); + + if (pdata->zone_node) + return 0; + + ret = fdtdec_parse_phandle_with_args(gd->fdt_blob, dev_of_offset(dev), + "thermal-sensors", + "#thermal-sensor-cells", + 0, 0, &args); + if (ret) + return ret; + + if (args.node != dev_of_offset(dev->parent)) + return -EFAULT; + + if (args.args_count >= 1) + pdata->id = args.args[0]; + else + pdata->id = 0; + + debug("args.args_count %d, id %d\n", args.args_count, pdata->id); + + pdata->polling_delay = fdtdec_get_int(gd->fdt_blob, dev_of_offset(dev), + "polling-delay", 1000); + + trips_np = fdt_subnode_offset(gd->fdt_blob, dev_of_offset(dev), + "trips"); + fdt_for_each_subnode(trips_np, gd->fdt_blob, trips_np) { + type = fdt_getprop(gd->fdt_blob, trips_np, "type", NULL); + if (type) { + if (strcmp(type, "critical") == 0) { + pdata->critical = fdtdec_get_int(gd->fdt_blob, + trips_np, + "temperature", + 85); + } else if (strcmp(type, "passive") == 0) { + pdata->alert = fdtdec_get_int(gd->fdt_blob, + trips_np, + "temperature", + 80); + } + } + } + + debug("id %d polling_delay %d, critical %d, alert %d\n", pdata->id, + pdata->polling_delay, pdata->critical, pdata->alert); + + return 0; +} + +static const sc_rsrc_t imx8qxp_sensor_rsrc[] = { + SC_R_SYSTEM, SC_R_DRC_0, SC_R_PMIC_0, + SC_R_PMIC_1, SC_R_PMIC_2, +}; + +static const struct udevice_id imx_sc_thermal_ids[] = { + { .compatible = "nxp,imx8qxp-sc-tsens", .data = + (ulong)&imx8qxp_sensor_rsrc, }, + { } +}; + +U_BOOT_DRIVER(imx_sc_thermal) = { + .name = "imx_sc_thermal", + .id = UCLASS_THERMAL, + .ops = &imx_sc_thermal_ops, + .of_match = imx_sc_thermal_ids, + .bind = imx_sc_thermal_bind, + .probe = imx_sc_thermal_probe, + .ofdata_to_platdata = imx_sc_thermal_ofdata_to_platdata, + .platdata_auto_alloc_size = sizeof(struct imx_sc_thermal_plat), + .flags = DM_FLAG_PRE_RELOC, +};