[U-Boot] [PATCH 5/8] thermal: add i.MX8 thermal driver

Peng Fan
2019-04-12T07:55:03Z

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,
+};
--
2.16.4