@@ -239,6 +239,14 @@ config HISI_THERMAL
thermal framework. cpufreq is used as the cooling device to throttle
CPUs when the passive trip is crossed.
+config KUNPENG_THERMAL
+ tristate "HiSilicon kunpeng thermal driver"
+ depends on ARM64 || COMPILE_TEST
+ help
+ Enable this to plug HiSilicon kunpeng's thermal sensors driver into
+ the Linux thermal framework, which supports to get the highest
+ temperature of one Kunpeng SoC.
+
config IMX_THERMAL
tristate "Temperature sensor driver for Freescale i.MX SoCs"
depends on ARCH_MXC || COMPILE_TEST
@@ -57,3 +57,4 @@ obj-$(CONFIG_GENERIC_ADC_THERMAL) += thermal-generic-adc.o
obj-$(CONFIG_ZX2967_THERMAL) += zx2967_thermal.o
obj-$(CONFIG_UNIPHIER_THERMAL) += uniphier_thermal.o
obj-$(CONFIG_AMLOGIC_THERMAL) += amlogic_thermal.o
+obj-$(CONFIG_KUNPENG_THERMAL) += kunpeng_thermal.o
new file mode 100644
@@ -0,0 +1,216 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (c) 2020 HiSilicon Limited. */
+
+#include <linux/acpi.h>
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/iopoll.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/thermal.h>
+
+#define KUNPENG_TSENSOR_CONTROL 0x20D0
+#define KUNPENG_TSENSOR_ST 0x60D0
+#define KUNPENG_TSENSOR_SAMPLE 0x60D4
+#define KUNPENG_TSENSOR_CONTROL_EN BIT(0)
+
+#define KUNPENG_TSENSOR_IS_READY(reg) (((reg) >> 12) & 0x1)
+#define KUNPENG_TSENSOR_IS_VALID(reg) (((reg) >> 31) & 0x1)
+#define KUNPENG_TSENSOR_TRIM_HIGH(reg) (((reg) >> 15) & 0x7FF)
+#define KUNPENG_TSENSOR_TRIM_LOW(reg) ((reg) & 0x7FF)
+#define KUNPENG_TSENSOR_TEMP_VAL(reg) ((reg) & 0x3FF)
+#define KUNPENG_TSENSOR_BASE_NUM(num) (2 * (num))
+#define KUNPENG_TSENSOR_TRIM_NUM(num) (2 * (num) + 1)
+
+#define KUNPENG_TSENSOR_RD_INTVRL_US 5
+#define KUNPENG_TSENSOR_RD_TMOUT_US 5000
+#define KUNPENG_TSENSOR_BASIC_TMP 25000
+#define KUNPENG_TSENSOR_BASIC_TRIM_RANGE 80000
+
+struct kunpeng_tsensor {
+ void __iomem *base;
+ void __iomem *trim_register;
+};
+
+struct kunpeng_thermal_dev {
+ u32 num_tsensors;
+ struct kunpeng_tsensor tsensor[];
+};
+
+static int kunpeng_thermal_temp_correct(u32 tmp, u32 trim)
+{
+ int trim_high = KUNPENG_TSENSOR_TRIM_HIGH(trim);
+ int trim_low = KUNPENG_TSENSOR_TRIM_LOW(trim);
+ int val = KUNPENG_TSENSOR_TEMP_VAL(tmp);
+
+ if (trim_high == trim_low)
+ return INT_MIN;
+
+ /* temperature of tsensor needs to be calibrated */
+ return KUNPENG_TSENSOR_BASIC_TRIM_RANGE * (val - trim_low) /
+ (trim_high - trim_low) + KUNPENG_TSENSOR_BASIC_TMP;
+}
+
+static int kunpeng_thermal_get_temp(struct thermal_zone_device *thermal,
+ int *temp)
+{
+ struct kunpeng_thermal_dev *tdev = thermal->devdata;
+ int tempmax = INT_MIN;
+ u32 i, reg, tmp, trim;
+ int ret;
+
+ for (i = 0; i < tdev->num_tsensors; i++) {
+ /* Waiting for tsensor ready */
+ ret = readl_relaxed_poll_timeout(tdev->tsensor[i].base +
+ KUNPENG_TSENSOR_ST, reg,
+ KUNPENG_TSENSOR_IS_READY(reg),
+ KUNPENG_TSENSOR_RD_INTVRL_US,
+ KUNPENG_TSENSOR_RD_TMOUT_US);
+ if (ret) {
+ dev_err(&thermal->device,
+ "Tsensor%u isn't ready!\n", i);
+ continue;
+ }
+
+ /* checking if temperatures are valid */
+ tmp = readl_relaxed(tdev->tsensor[i].base +
+ KUNPENG_TSENSOR_SAMPLE);
+ if (!KUNPENG_TSENSOR_IS_VALID(tmp)) {
+ dev_err(&thermal->device,
+ "Tsensor%u temperature is invalid!\n", i);
+ continue;
+ }
+
+ trim = readl_relaxed(tdev->tsensor[i].trim_register);
+
+ ret = kunpeng_thermal_temp_correct(tmp, trim);
+ if (ret == INT_MIN) {
+ dev_err(&thermal->device,
+ "Tsensor%u trim value is invalid!\n", i);
+ continue;
+ }
+
+ tempmax = max(ret, tempmax);
+ }
+
+ if (tempmax == INT_MIN)
+ return -EINVAL;
+
+ *temp = tempmax;
+
+ return 0;
+}
+
+static struct thermal_zone_device_ops ops = {
+ .get_temp = kunpeng_thermal_get_temp,
+};
+
+static int kunpeng_thermal_get_iobase(struct platform_device *pdev,
+ struct kunpeng_tsensor *tsensor,
+ u32 resource_num)
+{
+ struct resource *res;
+ void __iomem *base;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, resource_num);
+ if (!res)
+ return -EINVAL;
+
+ base = devm_ioremap(&pdev->dev, res->start, resource_size(res));
+ if (IS_ERR(base))
+ return -EINVAL;
+
+ if (resource_num & 1)
+ tsensor->trim_register = base;
+ else
+ tsensor->base = base;
+
+ return 0;
+}
+
+static int kunpeng_thermal_probe(struct platform_device *pdev)
+{
+ u32 num_tsensors = pdev->num_resources >> 1;
+ struct thermal_zone_device *thermal_zone;
+ struct kunpeng_thermal_dev *tdev;
+ u32 i, reg;
+ int ret;
+
+ tdev = devm_kzalloc(&pdev->dev, sizeof(*tdev) + sizeof(*tdev->tsensor) *
+ num_tsensors, GFP_KERNEL);
+ if (!tdev)
+ return -ENOMEM;
+
+ tdev->num_tsensors = num_tsensors;
+
+ for (i = 0; i < num_tsensors; i++) {
+ ret = kunpeng_thermal_get_iobase(pdev, &tdev->tsensor[i],
+ KUNPENG_TSENSOR_BASE_NUM(i));
+ if (ret) {
+ dev_err(&pdev->dev, "Fail to ioremap base!\n");
+ return ret;
+ }
+
+ ret = kunpeng_thermal_get_iobase(pdev, &tdev->tsensor[i],
+ KUNPENG_TSENSOR_TRIM_NUM(i));
+ if (ret) {
+ dev_err(&pdev->dev, "Fail to ioremap trim register!\n");
+ return ret;
+ }
+
+ reg = readl_relaxed(tdev->tsensor[i].base +
+ KUNPENG_TSENSOR_CONTROL);
+ writel_relaxed(reg | KUNPENG_TSENSOR_CONTROL_EN,
+ tdev->tsensor[i].base +
+ KUNPENG_TSENSOR_CONTROL);
+ }
+
+ thermal_zone = thermal_zone_device_register("kunpeng_thermal", 0, 0,
+ tdev, &ops, NULL, 0, 0);
+ if (IS_ERR(thermal_zone)) {
+ dev_err(&pdev->dev, "Fail to register to thermal subsystem\n");
+ return PTR_ERR(thermal_zone);
+ }
+
+ platform_set_drvdata(pdev, thermal_zone);
+
+ return 0;
+}
+
+/**
+ * kunpeng_thermal_remove() - Unregister device from thermal.
+ *
+ * This driver and IMU share tsensor devices. This function only unregister
+ * devices from thermal but never disable tsensors.
+ */
+static int kunpeng_thermal_remove(struct platform_device *pdev)
+{
+ struct thermal_zone_device *thermal_zone = platform_get_drvdata(pdev);
+
+ thermal_zone_device_unregister(thermal_zone);
+
+ return 0;
+}
+
+static const struct acpi_device_id kunpeng_thermal_acpi_match[] = {
+ { "HISI0371", 0 },
+ { }
+};
+MODULE_DEVICE_TABLE(acpi, kunpeng_thermal_acpi_match);
+
+static struct platform_driver kunpeng_thermal_driver = {
+ .probe = kunpeng_thermal_probe,
+ .remove = kunpeng_thermal_remove,
+ .driver = {
+ .name = "kunpeng_thermal",
+ .acpi_match_table = ACPI_PTR(kunpeng_thermal_acpi_match),
+ },
+};
+
+module_platform_driver(kunpeng_thermal_driver);
+
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Yang Shen <shenyang39@huawei.com>");
+MODULE_DESCRIPTION("HiSilicon Kunpeng thermal driver");