thermal: Add driver for Armada 370/XP SoC thermal management

This driver supports both Armada 370 and Armada XP SoC
thermal management controllers.

Armada 370 has a register to check a valid temperature, whereas
Armada XP does not. Each has a different initialization (i.e. calibration)
function. The temperature conversion formula is the same for both.

The controller present in each SoC have a very similar feature set,
so it corresponds to have one driver to support both of them.

Although this driver may present similarities to Dove and Kirkwood
thermal driver, the exact differences and coincidences are not fully
known. For this reason, support is given through a separate driver.

Signed-off-by: Ezequiel Garcia <ezequiel.garcia@free-electrons.com>
Signed-off-by: Zhang Rui <rui.zhang@intel.com>

1 files changed, 232 insertions, 0 deletions

diff --git a/drivers/thermal/armada_thermal.c b/drivers/thermal/armada_thermal.c
new file mode 100644
index 000000000000..5b4d75fd7b49
--- /dev/null
+++ b/drivers/thermal/armada_thermal.c
@@ -0,0 +1,232 @@
+/*
+ * Marvell Armada 370/XP thermal sensor driver
+ *
+ * Copyright (C) 2013 Marvell
+ *
+ * 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/delay.h>
+#include <linux/platform_device.h>
+#include <linux/of_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
+
+/* Thermal Manager Control and Status Register */
+#define PMU_TDC0_SW_RST_MASK            (0x1 << 1)
+#define PMU_TM_DISABLE_OFFS             0
+#define PMU_TM_DISABLE_MASK             (0x1 << PMU_TM_DISABLE_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_OTF_CAL_MASK           (0x1 << 30)
+#define PMU_TDC0_START_CAL_MASK         (0x1 << 25)
+
+struct armada_thermal_ops;
+
+/* Marvell EBU Thermal Sensor Dev Structure */
+struct armada_thermal_priv {
+        void __iomem *sensor;
+        void __iomem *control;
+        struct armada_thermal_ops *ops;
+};
+
+struct armada_thermal_ops {
+        /* Initialize the sensor */
+        void (*init_sensor)(struct armada_thermal_priv *);
+
+        /* Test for a valid sensor value (optional) */
+        bool (*is_valid)(struct armada_thermal_priv *);
+};
+
+static void armadaxp_init_sensor(struct armada_thermal_priv *priv)
+{
+        unsigned long reg;
+
+        reg = readl_relaxed(priv->control);
+        reg |= PMU_TDC0_OTF_CAL_MASK;
+        writel(reg, priv->control);
+
+        /* Reference calibration value */
+        reg &= ~PMU_TDC0_REF_CAL_CNT_MASK;
+        reg |= (0xf1 << PMU_TDC0_REF_CAL_CNT_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);
+}
+
+static void armada370_init_sensor(struct armada_thermal_priv *priv)
+{
+        unsigned long reg;
+
+        reg = readl_relaxed(priv->control);
+        reg |= PMU_TDC0_OTF_CAL_MASK;
+        writel(reg, priv->control);
+
+        /* Reference calibration value */
+        reg &= ~PMU_TDC0_REF_CAL_CNT_MASK;
+        reg |= (0xf1 << PMU_TDC0_REF_CAL_CNT_OFFS);
+        writel(reg, priv->control);
+
+        reg &= ~PMU_TDC0_START_CAL_MASK;
+        writel(reg, priv->control);
+
+        mdelay(10);
+}
+
+static bool armada_is_valid(struct armada_thermal_priv *priv)
+{
+        unsigned long reg = readl_relaxed(priv->sensor);
+
+        return (reg >> THERMAL_VALID_OFFSET) & THERMAL_VALID_MASK;
+}
+
+static int armada_get_temp(struct thermal_zone_device *thermal,
+                          unsigned long *temp)
+{
+        struct armada_thermal_priv *priv = thermal->devdata;
+        unsigned long reg;
+
+        /* Valid check */
+        if (priv->ops->is_valid && !priv->ops->is_valid(priv)) {
+                dev_err(&thermal->device,
+                        "Temperature sensor reading not valid\n");
+                return -EIO;
+        }
+
+        reg = readl_relaxed(priv->sensor);
+        reg = (reg >> THERMAL_TEMP_OFFSET) & THERMAL_TEMP_MASK;
+        *temp = (3153000000UL - (10000000UL*reg)) / 13825;
+        return 0;
+}
+
+static struct thermal_zone_device_ops ops = {
+        .get_temp = armada_get_temp,
+};
+
+static const struct armada_thermal_ops armadaxp_ops = {
+        .init_sensor = armadaxp_init_sensor,
+};
+
+static const struct armada_thermal_ops armada370_ops = {
+        .is_valid = armada_is_valid,
+        .init_sensor = armada370_init_sensor,
+};
+
+static const struct of_device_id armada_thermal_id_table[] = {
+        {
+                .compatible = "marvell,armadaxp-thermal",
+                .data       = &armadaxp_ops,
+        },
+        {
+                .compatible = "marvell,armada370-thermal",
+                .data       = &armada370_ops,
+        },
+        {
+                /* sentinel */
+        },
+};
+MODULE_DEVICE_TABLE(of, armada_thermal_id_table);
+
+static int armada_thermal_probe(struct platform_device *pdev)
+{
+        struct thermal_zone_device *thermal;
+        const struct of_device_id *match;
+        struct armada_thermal_priv *priv;
+        struct resource *res;
+
+        match = of_match_device(armada_thermal_id_table, &pdev->dev);
+        if (!match)
+                return -ENODEV;
+
+        priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
+        if (!priv)
+                return -ENOMEM;
+
+        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+        if (!res) {
+                dev_err(&pdev->dev, "Failed to get platform resource\n");
+                return -ENODEV;
+        }
+
+        priv->sensor = devm_ioremap_resource(&pdev->dev, res);
+        if (IS_ERR(priv->sensor))
+                return PTR_ERR(priv->sensor);
+
+        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_ioremap_resource(&pdev->dev, res);
+        if (IS_ERR(priv->control))
+                return PTR_ERR(priv->control);
+
+        priv->ops = (struct armada_thermal_ops *)match->data;
+        priv->ops->init_sensor(priv);
+
+        thermal = thermal_zone_device_register("armada_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 armada_thermal_exit(struct platform_device *pdev)
+{
+        struct thermal_zone_device *armada_thermal =
+                platform_get_drvdata(pdev);
+
+        thermal_zone_device_unregister(armada_thermal);
+        platform_set_drvdata(pdev, NULL);
+
+        return 0;
+}
+
+static struct platform_driver armada_thermal_driver = {
+        .probe = armada_thermal_probe,
+        .remove = armada_thermal_exit,
+        .driver = {
+                .name = "armada_thermal",
+                .owner = THIS_MODULE,
+                .of_match_table = of_match_ptr(armada_thermal_id_table),
+        },
+};
+
+module_platform_driver(armada_thermal_driver);
+
+MODULE_AUTHOR("Ezequiel Garcia <ezequiel.garcia@free-electrons.com>");
+MODULE_DESCRIPTION("Armada 370/XP thermal driver");
+MODULE_LICENSE("GPL v2");