Thermal: Dove: Add Themal sensor support for Dove.

The Marvell Dove SoC has a thermal sensor. Add a driver using the
thermal framework.

Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
Signed-off-by: Zhang Rui <rui.zhang@intel.com>

diff --git a/Documentation/devicetree/bindings/thermal/dove-thermal.txt b/Documentation/devicetree/bindings/thermal/dove-thermal.txt
new file mode 100644 (file)
index 0000000..6f47467
--- /dev/null
+++ b/Documentation/devicetree/bindings/thermal/dove-thermal.txt
@@ -0,0 +1,18 @@
+* Dove Thermal
+
+This driver is for Dove SoCs which contain a thermal sensor.
+
+Required properties:
+- compatible : "marvell,dove-thermal"
+- reg : Address range of the thermal registers
+
+The reg properties should contain two ranges. The first is for the
+three Thermal Manager registers, while the second range contains the
+Thermal Diode Control Registers.
+
+Example:
+
+       thermal@10078 {
+               compatible = "marvell,dove-thermal";
+               reg = <0xd001c 0x0c>, <0xd005c 0x08>;
+       };

diff --git a/drivers/thermal/Kconfig b/drivers/thermal/Kconfig
index 5070fbee24ef6a1d05bc4a89c533b343caad7751..24d913aa1003275658a070607ec46d00efe037a3 100644 (file)
--- a/drivers/thermal/Kconfig
+++ b/drivers/thermal/Kconfig
@@ -126,6 +126,14 @@ config EXYNOS_THERMAL_EMUL
          device directory to support emulation mode. With emulation mode sysfs
          node, you can manually input temperature to TMU for simulation purpose.
 
+config DOVE_THERMAL
+       tristate "Temperature sensor on Marvell Dove SoCs"
+       depends on ARCH_DOVE
+       depends on OF
+       help
+         Support for the Dove thermal sensor driver in the Linux thermal
+         framework.
+
 config DB8500_THERMAL
        bool "DB8500 thermal management"
        depends on ARCH_U8500

diff --git a/drivers/thermal/Makefile b/drivers/thermal/Makefile
index b32c35de67e7a7e0332119098220d7a390109613..f5c01cce776849c2ccf6dd29d0d27c4a8d52bb08 100644 (file)
--- a/drivers/thermal/Makefile
+++ b/drivers/thermal/Makefile
@@ -17,6 +17,7 @@ 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
+obj-$(CONFIG_DOVE_THERMAL)     += dove_thermal.o
 obj-$(CONFIG_DB8500_THERMAL)   += db8500_thermal.o
 obj-$(CONFIG_DB8500_CPUFREQ_COOLING)   += db8500_cpufreq_cooling.o
 obj-$(CONFIG_INTEL_POWERCLAMP) += intel_powerclamp.o

diff --git a/drivers/thermal/dove_thermal.c b/drivers/thermal/dove_thermal.c
new file mode 100644 (file)
index 0000000..7b0bfa0
--- /dev/null
+++ b/drivers/thermal/dove_thermal.c
@@ -0,0 +1,209 @@
+/*
+ * Dove thermal sensor driver
+ *
+ * Copyright (C) 2013 Andrew Lunn <andrew@lunn.ch>
+ *
+ * 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 DOVE_THERMAL_TEMP_OFFSET       1
+#define DOVE_THERMAL_TEMP_MASK         0x1FF
+
+/* Dove Thermal Manager Control and Status Register */
+#define PMU_TM_DISABLE_OFFS            0
+#define PMU_TM_DISABLE_MASK            (0x1 << PMU_TM_DISABLE_OFFS)
+
+/* Dove Theraml Diode Control 0 Register */
+#define PMU_TDC0_SW_RST_MASK           (0x1 << 1)
+#define PMU_TDC0_SEL_VCAL_OFFS         5
+#define PMU_TDC0_SEL_VCAL_MASK         (0x3 << PMU_TDC0_SEL_VCAL_OFFS)
+#define PMU_TDC0_REF_CAL_CNT_OFFS      11
+#define PMU_TDC0_REF_CAL_CNT_MASK      (0x1FF << PMU_TDC0_REF_CAL_CNT_OFFS)
+#define PMU_TDC0_AVG_NUM_OFFS          25
+#define PMU_TDC0_AVG_NUM_MASK          (0x7 << PMU_TDC0_AVG_NUM_OFFS)
+
+/* Dove Thermal Diode Control 1 Register */
+#define PMU_TEMP_DIOD_CTRL1_REG                0x04
+#define PMU_TDC1_TEMP_VALID_MASK       (0x1 << 10)
+
+/* Dove Thermal Sensor Dev Structure */
+struct dove_thermal_priv {
+       void __iomem *sensor;
+       void __iomem *control;
+};
+
+static int dove_init_sensor(const struct dove_thermal_priv *priv)
+{
+       u32 reg;
+       u32 i;
+
+       /* Configure the Diode Control Register #0 */
+       reg = readl_relaxed(priv->control);
+
+       /* Use average of 2 */
+       reg &= ~PMU_TDC0_AVG_NUM_MASK;
+       reg |= (0x1 << PMU_TDC0_AVG_NUM_OFFS);
+
+       /* Reference calibration value */
+       reg &= ~PMU_TDC0_REF_CAL_CNT_MASK;
+       reg |= (0x0F1 << PMU_TDC0_REF_CAL_CNT_OFFS);
+
+       /* Set the high level reference for calibration */
+       reg &= ~PMU_TDC0_SEL_VCAL_MASK;
+       reg |= (0x2 << PMU_TDC0_SEL_VCAL_OFFS);
+       writel(reg, priv->control);
+
+       /* Reset the sensor */
+       reg = readl_relaxed(priv->control);
+       writel((reg | PMU_TDC0_SW_RST_MASK), priv->control);
+       writel(reg, priv->control);
+
+       /* Enable the sensor */
+       reg = readl_relaxed(priv->sensor);
+       reg &= ~PMU_TM_DISABLE_MASK;
+       writel(reg, priv->sensor);
+
+       /* Poll the sensor for the first reading */
+       for (i = 0; i < 1000000; i++) {
+               reg = readl_relaxed(priv->sensor);
+               if (reg & DOVE_THERMAL_TEMP_MASK)
+                       break;
+       }
+
+       if (i == 1000000)
+               return -EIO;
+
+       return 0;
+}
+
+static int dove_get_temp(struct thermal_zone_device *thermal,
+                         unsigned long *temp)
+{
+       unsigned long reg;
+       struct dove_thermal_priv *priv = thermal->devdata;
+
+       /* Valid check */
+       reg = readl_relaxed(priv->control + PMU_TEMP_DIOD_CTRL1_REG);
+       if ((reg & PMU_TDC1_TEMP_VALID_MASK) == 0x0) {
+               dev_err(&thermal->device,
+                       "Temperature sensor reading not valid\n");
+               return -EIO;
+       }
+
+       /*
+        * Calculate temperature. See Section 8.10.1 of 88AP510,
+        * Documentation/arm/Marvell/README
+        */
+       reg = readl_relaxed(priv->sensor);
+       reg = (reg >> DOVE_THERMAL_TEMP_OFFSET) & DOVE_THERMAL_TEMP_MASK;
+       *temp = ((2281638UL - (7298*reg)) / 10);
+
+       return 0;
+}
+
+static struct thermal_zone_device_ops ops = {
+       .get_temp = dove_get_temp,
+};
+
+static const struct of_device_id dove_thermal_id_table[] = {
+       { .compatible = "marvell,dove-thermal" },
+       {}
+};
+
+static int dove_thermal_probe(struct platform_device *pdev)
+{
+       struct thermal_zone_device *thermal = NULL;
+       struct dove_thermal_priv *priv;
+       struct resource *res;
+       int ret;
+
+       res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+       if (!res) {
+               dev_err(&pdev->dev, "Failed to get platform resource\n");
+               return -ENODEV;
+       }
+
+       priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
+       if (!priv)
+               return -ENOMEM;
+
+       priv->sensor = devm_request_and_ioremap(&pdev->dev, res);
+       if (!priv->sensor) {
+               dev_err(&pdev->dev, "Failed to request_ioremap memory\n");
+               return -EADDRNOTAVAIL;
+       }
+
+       res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+       if (!res) {
+               dev_err(&pdev->dev, "Failed to get platform resource\n");
+               return -ENODEV;
+       }
+       priv->control = devm_request_and_ioremap(&pdev->dev, res);
+       if (!priv->control) {
+               dev_err(&pdev->dev, "Failed to request_ioremap memory\n");
+               return -EADDRNOTAVAIL;
+       }
+
+       ret = dove_init_sensor(priv);
+       if (ret) {
+               dev_err(&pdev->dev, "Failed to initialize sensor\n");
+               return ret;
+       }
+
+       thermal = thermal_zone_device_register("dove_thermal", 0, 0,
+                                              priv, &ops, NULL, 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);
+
+       return 0;
+}
+
+static int dove_thermal_exit(struct platform_device *pdev)
+{
+       struct thermal_zone_device *dove_thermal =
+               platform_get_drvdata(pdev);
+
+       thermal_zone_device_unregister(dove_thermal);
+       platform_set_drvdata(pdev, NULL);
+
+       return 0;
+}
+
+MODULE_DEVICE_TABLE(of, dove_thermal_id_table);
+
+static struct platform_driver dove_thermal_driver = {
+       .probe = dove_thermal_probe,
+       .remove = dove_thermal_exit,
+       .driver = {
+               .name = "dove_thermal",
+               .owner = THIS_MODULE,
+               .of_match_table = of_match_ptr(dove_thermal_id_table),
+       },
+};
+
+module_platform_driver(dove_thermal_driver);
+
+MODULE_AUTHOR("Andrew Lunn <andrew@lunn.ch>");
+MODULE_DESCRIPTION("Dove thermal driver");
+MODULE_LICENSE("GPL");