1 files changed, 206 insertions, 0 deletions

diff --git a/drivers/thermal/spear_thermal.c b/drivers/thermal/spear_thermal.c
new file mode 100644
index 000000000000..c2e32df3b164
--- /dev/null
+++ b/drivers/thermal/spear_thermal.c
@@ -0,0 +1,206 @@
+/*
+ * SPEAr thermal driver.
+ *
+ * Copyright (C) 2011-2012 ST Microelectronics
+ * Author: Vincenzo Frascino <vincenzo.frascino@st.com>
+ *
+ * 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/clk.h>
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/platform_data/spear_thermal.h>
+#include <linux/thermal.h>
+
+#define MD_FACTOR       1000
+
+/* SPEAr Thermal Sensor Dev Structure */
+struct spear_thermal_dev {
+        /* pointer to base address of the thermal sensor */
+        void __iomem *thermal_base;
+        /* clk structure */
+        struct clk *clk;
+        /* pointer to thermal flags */
+        unsigned int flags;
+};
+
+static inline int thermal_get_temp(struct thermal_zone_device *thermal,
+                                unsigned long *temp)
+{
+        struct spear_thermal_dev *stdev = thermal->devdata;
+
+        /*
+         * Data are ready to be read after 628 usec from POWERDOWN signal
+         * (PDN) = 1
+         */
+        *temp = (readl_relaxed(stdev->thermal_base) & 0x7F) * MD_FACTOR;
+        return 0;
+}
+
+static struct thermal_zone_device_ops ops = {
+        .get_temp = thermal_get_temp,
+};
+
+#ifdef CONFIG_PM
+static int spear_thermal_suspend(struct device *dev)
+{
+        struct platform_device *pdev = to_platform_device(dev);
+        struct thermal_zone_device *spear_thermal = platform_get_drvdata(pdev);
+        struct spear_thermal_dev *stdev = spear_thermal->devdata;
+        unsigned int actual_mask = 0;
+
+        /* Disable SPEAr Thermal Sensor */
+        actual_mask = readl_relaxed(stdev->thermal_base);
+        writel_relaxed(actual_mask & ~stdev->flags, stdev->thermal_base);
+
+        clk_disable(stdev->clk);
+        dev_info(dev, "Suspended.\n");
+
+        return 0;
+}
+
+static int spear_thermal_resume(struct device *dev)
+{
+        struct platform_device *pdev = to_platform_device(dev);
+        struct thermal_zone_device *spear_thermal = platform_get_drvdata(pdev);
+        struct spear_thermal_dev *stdev = spear_thermal->devdata;
+        unsigned int actual_mask = 0;
+        int ret = 0;
+
+        ret = clk_enable(stdev->clk);
+        if (ret) {
+                dev_err(&pdev->dev, "Can't enable clock\n");
+                return ret;
+        }
+
+        /* Enable SPEAr Thermal Sensor */
+        actual_mask = readl_relaxed(stdev->thermal_base);
+        writel_relaxed(actual_mask | stdev->flags, stdev->thermal_base);
+
+        dev_info(dev, "Resumed.\n");
+
+        return 0;
+}
+#endif
+
+static SIMPLE_DEV_PM_OPS(spear_thermal_pm_ops, spear_thermal_suspend,
+                spear_thermal_resume);
+
+static int spear_thermal_probe(struct platform_device *pdev)
+{
+        struct thermal_zone_device *spear_thermal = NULL;
+        struct spear_thermal_dev *stdev;
+        struct spear_thermal_pdata *pdata;
+        int ret = 0;
+        struct resource *stres = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+
+        if (!stres) {
+                dev_err(&pdev->dev, "memory resource missing\n");
+                return -ENODEV;
+        }
+
+        pdata = dev_get_platdata(&pdev->dev);
+        if (!pdata) {
+                dev_err(&pdev->dev, "platform data is NULL\n");
+                return -EINVAL;
+        }
+
+        stdev = devm_kzalloc(&pdev->dev, sizeof(*stdev), GFP_KERNEL);
+        if (!stdev) {
+                dev_err(&pdev->dev, "kzalloc fail\n");
+                return -ENOMEM;
+        }
+
+        /* Enable thermal sensor */
+        stdev->thermal_base = devm_ioremap(&pdev->dev, stres->start,
+                        resource_size(stres));
+        if (!stdev->thermal_base) {
+                dev_err(&pdev->dev, "ioremap failed\n");
+                return -ENOMEM;
+        }
+
+        stdev->clk = clk_get(&pdev->dev, NULL);
+        if (IS_ERR(stdev->clk)) {
+                dev_err(&pdev->dev, "Can't get clock\n");
+                return PTR_ERR(stdev->clk);
+        }
+
+        ret = clk_enable(stdev->clk);
+        if (ret) {
+                dev_err(&pdev->dev, "Can't enable clock\n");
+                goto put_clk;
+        }
+
+        stdev->flags = pdata->thermal_flags;
+        writel_relaxed(stdev->flags, stdev->thermal_base);
+
+        spear_thermal = thermal_zone_device_register("spear_thermal", 0,
+                                stdev, &ops, 0, 0, 0, 0);
+        if (IS_ERR(spear_thermal)) {
+                dev_err(&pdev->dev, "thermal zone device is NULL\n");
+                ret = PTR_ERR(spear_thermal);
+                goto disable_clk;
+        }
+
+        platform_set_drvdata(pdev, spear_thermal);
+
+        dev_info(&spear_thermal->device, "Thermal Sensor Loaded at: 0x%p.\n",
+                        stdev->thermal_base);
+
+        return 0;
+
+disable_clk:
+        clk_disable(stdev->clk);
+put_clk:
+        clk_put(stdev->clk);
+
+        return ret;
+}
+
+static int spear_thermal_exit(struct platform_device *pdev)
+{
+        unsigned int actual_mask = 0;
+        struct thermal_zone_device *spear_thermal = platform_get_drvdata(pdev);
+        struct spear_thermal_dev *stdev = spear_thermal->devdata;
+
+        thermal_zone_device_unregister(spear_thermal);
+        platform_set_drvdata(pdev, NULL);
+
+        /* Disable SPEAr Thermal Sensor */
+        actual_mask = readl_relaxed(stdev->thermal_base);
+        writel_relaxed(actual_mask & ~stdev->flags, stdev->thermal_base);
+
+        clk_disable(stdev->clk);
+        clk_put(stdev->clk);
+
+        return 0;
+}
+
+static struct platform_driver spear_thermal_driver = {
+        .probe = spear_thermal_probe,
+        .remove = spear_thermal_exit,
+        .driver = {
+                .name = "spear_thermal",
+                .owner = THIS_MODULE,
+                .pm = &spear_thermal_pm_ops,
+        },
+};
+
+module_platform_driver(spear_thermal_driver);
+
+MODULE_AUTHOR("Vincenzo Frascino <vincenzo.frascino@st.com>");
+MODULE_DESCRIPTION("SPEAr thermal driver");
+MODULE_LICENSE("GPL");