| /* |
| * 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 = 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"); |