[1/2] thermal: Add support for thermal sensor for Kirkwood SoC

Message ID	1354922151-3250-1-git-send-email-iwamatsu@nigauri.org (mailing list archive)
State	Superseded, archived
Delegated to:	Zhang Rui
Headers	show Return-Path: <linux-pm-owner@vger.kernel.org> From: Nobuhiro Iwamatsu <iwamatsu@nigauri.org> To: linux-pm@vger.kernel.org Cc: linux-arm-kernel@lists.infradead.org, rui.zhang@intel.com, jason@lakedaemon.net, Nobuhiro Iwamatsu <iwamatsu@nigauri.org> Subject: [PATCH 1/2] thermal: Add support for thermal sensor for Kirkwood SoC Date: Sat, 8 Dec 2012 08:15:50 +0900 Message-Id: <1354922151-3250-1-git-send-email-iwamatsu@nigauri.org> Sender: linux-pm-owner@vger.kernel.org Precedence: bulk

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@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@nigauri.org>"); +MODULE_DESCRIPTION("kirkwood thermal driver"); +MODULE_LICENSE("GPL");

[1/2] thermal: Add support for thermal sensor for Kirkwood SoC

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