[PATCH 1/2] thermal: Add support for thermal sensor for Kirkwood SoC
Nobuhiro Iwamatsu
iwamatsu at nigauri.org
Fri Dec 7 18:15:50 EST 2012
Some kirkwood SoC has thermal sensor.
This patch adds support for 88F6282 and 88F6283.
Signed-off-by: Nobuhiro Iwamatsu <iwamatsu at nigauri.org>
---
drivers/thermal/Kconfig | 7 ++
drivers/thermal/Makefile | 1 +
drivers/thermal/kirkwood_thermal.c | 131 ++++++++++++++++++++++++++++++++++++
3 files changed, 139 insertions(+)
create mode 100644 drivers/thermal/kirkwood_thermal.c
diff --git a/drivers/thermal/Kconfig b/drivers/thermal/Kconfig
index e1cb6bd..8710ac2 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 KIRKWOOD_THERMAL
+ tristate "Temperature sensor on Marvel Kirkwood"
+ depends on ARCH_KIRKWOOD && THERMAL
+ help
+ Support for the Kirkwood thermal sensor driver into the Linux thermal
+ framework. This supports only 88F6282 and 88F6283.
diff --git a/drivers/thermal/Makefile b/drivers/thermal/Makefile
index 885550d..4dbe5e1 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-$(CONFIG_KIRKWOOD_THERMAL) += kirkwood_thermal.o
obj-$(CONFIG_EXYNOS_THERMAL) += exynos_thermal.o
diff --git a/drivers/thermal/kirkwood_thermal.c b/drivers/thermal/kirkwood_thermal.c
new file mode 100644
index 0000000..bddcf49
--- /dev/null
+++ b/drivers/thermal/kirkwood_thermal.c
@@ -0,0 +1,131 @@
+/*
+ * kirkwood 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
+
+/* Kirkwood Thermal Sensor Dev Structure */
+struct kirkwood_thermal_dev {
+ void __iomem *base_addr;
+};
+
+static inline int kirkwood_get_temp(struct thermal_zone_device *thermal,
+ unsigned long *temp)
+{
+ unsigned long reg;
+ struct kirkwood_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, "Reading temperature is not valid\n");
+ return -EIO;
+ }
+
+ reg = (reg >> THERMAL_TEMP_OFFSET) & THERMAL_TEMP_MASK;
+ /* Calculate temperature. See Table 814 in hardware manual. */
+ *temp = ((322 - reg) * 10000) / 13625;
+
+ return 0;
+}
+
+static struct thermal_zone_device_ops ops = {
+ .get_temp = kirkwood_get_temp,
+};
+
+static int kirkwood_thermal_probe(struct platform_device *pdev)
+{
+ struct thermal_zone_device *thermal = NULL;
+ struct kirkwood_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("kirkwood_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 kirkwood_thermal_exit(struct platform_device *pdev)
+{
+ struct thermal_zone_device *kirkwood_thermal
+ = platform_get_drvdata(pdev);
+
+ thermal_zone_device_unregister(kirkwood_thermal);
+ platform_set_drvdata(pdev, NULL);
+
+ return 0;
+}
+
+static const struct of_device_id kirkwood_thermal_id_table[] = {
+ { .compatible = "marvel,thermal-kirkwood" },
+ {}
+};
+MODULE_DEVICE_TABLE(of, kirkwood_thermal_id_table);
+
+static struct platform_driver kirkwood_thermal_driver = {
+ .probe = kirkwood_thermal_probe,
+ .remove = kirkwood_thermal_exit,
+ .driver = {
+ .name = "kirkwood_thermal",
+ .owner = THIS_MODULE,
+ .of_match_table = of_match_ptr(kirkwood_thermal_id_table),
+ },
+};
+
+module_platform_driver(kirkwood_thermal_driver);
+
+MODULE_AUTHOR("Nobuhiro Iwamatsu <iwamatsu at nigauri.org>");
+MODULE_DESCRIPTION("kirkwood thermal driver");
+MODULE_LICENSE("GPL");
--
1.7.10.4
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