[PATCH 1/2] thermal: Add support for thermal sensor for Orion SoC
Andrew Lunn
andrew at lunn.ch
Fri Dec 14 06:03:05 EST 2012
From: Nobuhiro Iwamatsu <iwamatsu at nigauri.org>
Some Orion SoC has thermal sensor.
This patch adds support for 88F6282 and 88F6283.
Signed-off-by: Nobuhiro Iwamatsu <iwamatsu at nigauri.org>
Signed-off-by: Andrew Lunn <andrew at lunn.ch>
---
.../devicetree/bindings/thermal/orion-thermal.txt | 16 +++
drivers/thermal/Kconfig | 7 ++
drivers/thermal/Makefile | 1 +
drivers/thermal/orion_thermal.c | 133 ++++++++++++++++++++
4 files changed, 157 insertions(+)
create mode 100644 Documentation/devicetree/bindings/thermal/orion-thermal.txt
create mode 100644 drivers/thermal/orion_thermal.c
diff --git a/Documentation/devicetree/bindings/thermal/orion-thermal.txt b/Documentation/devicetree/bindings/thermal/orion-thermal.txt
new file mode 100644
index 0000000..5ce925d
--- /dev/null
+++ b/Documentation/devicetree/bindings/thermal/orion-thermal.txt
@@ -0,0 +1,16 @@
+* Orion Thermal
+
+This initial version is for Kirkwood 88F8262 & 88F6283 SoCs, however
+it is expected the driver will sometime in the future be expanded to
+also support Dove, using a different compatibility string.
+
+Required properties:
+- compatible : "marvell,kirkwood-thermal"
+- reg : Address range of the thermal registers
+
+Example:
+
+ thermal at 10078 {
+ compatible = "marvell,kirkwood";
+ reg = <0x10078 0x4>;
+ };
diff --git a/drivers/thermal/Kconfig b/drivers/thermal/Kconfig
index e1cb6bd..3bba13f 100644
--- a/drivers/thermal/Kconfig
+++ b/drivers/thermal/Kconfig
@@ -55,3 +55,10 @@ config EXYNOS_THERMAL
help
If you say yes here you get support for TMU (Thermal Managment
Unit) on SAMSUNG EXYNOS series of SoC.
+
+config ORION_THERMAL
+ tristate "Temperature sensor on Marvel Orion SoCs"
+ depends on PLAT_ORION && THERMAL
+ help
+ Support for the Orion thermal sensor driver into the Linux thermal
+ framework. This currently supports only 88F6282 and 88F6283.
diff --git a/drivers/thermal/Makefile b/drivers/thermal/Makefile
index 885550d..2fc64aa 100644
--- a/drivers/thermal/Makefile
+++ b/drivers/thermal/Makefile
@@ -6,4 +6,5 @@ obj-$(CONFIG_THERMAL) += thermal_sys.o
obj-$(CONFIG_CPU_THERMAL) += cpu_cooling.o
obj-$(CONFIG_SPEAR_THERMAL) += spear_thermal.o
obj-$(CONFIG_RCAR_THERMAL) += rcar_thermal.o
+obj-$(CONFIG_ORION_THERMAL) += orion_thermal.o
obj-$(CONFIG_EXYNOS_THERMAL) += exynos_thermal.o
diff --git a/drivers/thermal/orion_thermal.c b/drivers/thermal/orion_thermal.c
new file mode 100644
index 0000000..e8a2a68
--- /dev/null
+++ b/drivers/thermal/orion_thermal.c
@@ -0,0 +1,133 @@
+/*
+ * Orion thermal sensor driver
+ *
+ * Copyright (C) 2012 Nobuhiro Iwamatsu <iwamatsu at nigauri.org>
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ */
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/of.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/thermal.h>
+
+#define THERMAL_VALID_OFFSET 9
+#define THERMAL_VALID_MASK 0x1
+#define THERMAL_TEMP_OFFSET 10
+#define THERMAL_TEMP_MASK 0x1FF
+
+/* Orion Thermal Sensor Dev Structure */
+struct orion_thermal_dev {
+ void __iomem *base_addr;
+};
+
+static int orion_get_temp(struct thermal_zone_device *thermal,
+ unsigned long *temp)
+{
+ unsigned long reg;
+ struct orion_thermal_dev *thermal_dev = thermal->devdata;
+
+ reg = readl_relaxed(thermal_dev->base_addr);
+
+ /* Valid check */
+ if (!(reg >> THERMAL_VALID_OFFSET) & THERMAL_VALID_MASK) {
+ dev_info(&thermal->device,
+ "Temperature sensor reading not valid\n");
+ return -EIO;
+ }
+
+ reg = (reg >> THERMAL_TEMP_OFFSET) & THERMAL_TEMP_MASK;
+ /* Calculate temperature. See Table 814 in 8262 hardware manual. */
+ *temp = ((322UL - reg) * 10000UL * 1000UL) / 13625UL;
+
+ return 0;
+}
+
+static struct thermal_zone_device_ops ops = {
+ .get_temp = orion_get_temp,
+};
+
+static int orion_thermal_probe(struct platform_device *pdev)
+{
+ struct thermal_zone_device *thermal = NULL;
+ struct orion_thermal_dev *thermal_dev;
+ struct resource *res;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!res) {
+ dev_err(&pdev->dev, "Failed to get platform resource\n");
+ return -ENODEV;
+ }
+
+ thermal_dev = devm_kzalloc(&pdev->dev, sizeof(*thermal_dev),
+ GFP_KERNEL);
+ if (!thermal_dev) {
+ dev_err(&pdev->dev, "kzalloc fail\n");
+ return -ENOMEM;
+ }
+
+ thermal_dev->base_addr = devm_ioremap(&pdev->dev, res->start,
+ resource_size(res));
+ if (!thermal_dev->base_addr) {
+ dev_err(&pdev->dev, "Failed to ioremap memory\n");
+ return -ENOMEM;
+ }
+
+ thermal = thermal_zone_device_register("orion_thermal", 0, 0,
+ thermal_dev, &ops, 0, 0);
+ if (IS_ERR(thermal)) {
+ dev_err(&pdev->dev,
+ "Failed to register thermal zone device\n");
+ return PTR_ERR(thermal);
+ }
+
+ platform_set_drvdata(pdev, thermal);
+
+ dev_info(&thermal->device,
+ KBUILD_MODNAME ": Thermal sensor registered\n");
+
+ return 0;
+}
+
+static int orion_thermal_exit(struct platform_device *pdev)
+{
+ struct thermal_zone_device *orion_thermal = platform_get_drvdata(pdev);
+
+ thermal_zone_device_unregister(orion_thermal);
+ platform_set_drvdata(pdev, NULL);
+
+ return 0;
+}
+
+static const struct of_device_id orion_thermal_id_table[] = {
+ { .compatible = "marvell,kirkwood-thermal" },
+ {}
+};
+MODULE_DEVICE_TABLE(of, orion_thermal_id_table);
+
+static struct platform_driver orion_thermal_driver = {
+ .probe = orion_thermal_probe,
+ .remove = orion_thermal_exit,
+ .driver = {
+ .name = "orion_thermal",
+ .owner = THIS_MODULE,
+ .of_match_table = of_match_ptr(orion_thermal_id_table),
+ },
+};
+
+module_platform_driver(orion_thermal_driver);
+
+MODULE_AUTHOR("Nobuhiro Iwamatsu <iwamatsu at nigauri.org>");
+MODULE_DESCRIPTION("orion thermal driver");
+MODULE_LICENSE("GPL");
--
1.7.10.4
More information about the linux-arm-kernel
mailing list