| Message ID | 1360005560-21945-2-git-send-email-andrew@lunn.ch (mailing list archive) |
|---|---|
| State | Superseded, archived |
| Delegated to: | Zhang Rui |
| Headers | show |
On Mon, Feb 04, 2013 at 08:19:17PM +0100, Andrew Lunn wrote: > From: Nobuhiro Iwamatsu <iwamatsu@nigauri.org> > > This patch adds support for Kirkwood 88F6282 and 88F6283 thermal sensor. > > Signed-off-by: Nobuhiro Iwamatsu <iwamatsu@nigauri.org> > Signed-off-by: Andrew Lunn <andrew@lunn.ch> > --- > .../bindings/thermal/kirkwood-thermal.txt | 15 +++ > drivers/thermal/Kconfig | 8 ++ > drivers/thermal/Makefile | 1 + > drivers/thermal/kirkwood_thermal.c | 136 ++++++++++++++++++++ > 4 files changed, 160 insertions(+) > create mode 100644 Documentation/devicetree/bindings/thermal/kirkwood-thermal.txt > create mode 100644 drivers/thermal/kirkwood_thermal.c > > diff --git a/Documentation/devicetree/bindings/thermal/kirkwood-thermal.txt b/Documentation/devicetree/bindings/thermal/kirkwood-thermal.txt > new file mode 100644 > index 0000000..8c0f5eb > --- /dev/null > +++ b/Documentation/devicetree/bindings/thermal/kirkwood-thermal.txt > @@ -0,0 +1,15 @@ > +* Kirkwood Thermal > + > +This version is for Kirkwood 88F8262 & 88F6283 SoCs. Other kirkwoods > +don't contain a thermal sensor. > + > +Required properties: > +- compatible : "marvell,kirkwood-thermal" > +- reg : Address range of the thermal registers > + > +Example: > + > + thermal@10078 { > + compatible = "marvell,kirkwood-thermal"; > + reg = <0x10078 0x4>; > + }; > diff --git a/drivers/thermal/Kconfig b/drivers/thermal/Kconfig > index c2c77d1..ff34a0a 100644 > --- a/drivers/thermal/Kconfig > +++ b/drivers/thermal/Kconfig > @@ -93,6 +93,14 @@ config RCAR_THERMAL > Enable this to plug the R-Car thermal sensor driver into the Linux > thermal framework > > +config KIRKWOOD_THERMAL > + tristate "Temperature sensor on Marvell Kirkwood SoCs" > + depends on ARCH_KIRKWOOD > + depends on OF > + help > + Support for the Kirkwood thermal sensor driver into the Linux thermal > + framework. Only kirkwood 88F6282 and 88F6283 have this sensor. > + > config EXYNOS_THERMAL > tristate "Temperature sensor on Samsung EXYNOS" > depends on (ARCH_EXYNOS4 || ARCH_EXYNOS5) > diff --git a/drivers/thermal/Makefile b/drivers/thermal/Makefile > index d8da683..99026b2 100644 > --- a/drivers/thermal/Makefile > +++ b/drivers/thermal/Makefile > @@ -15,6 +15,7 @@ obj-$(CONFIG_CPU_THERMAL) += cpu_cooling.o > # platform thermal drivers > obj-$(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_DB8500_THERMAL) += db8500_thermal.o > obj-$(CONFIG_DB8500_CPUFREQ_COOLING) += db8500_cpufreq_cooling.o > diff --git a/drivers/thermal/kirkwood_thermal.c b/drivers/thermal/kirkwood_thermal.c > new file mode 100644 > index 0000000..000cfc9 > --- /dev/null > +++ b/drivers/thermal/kirkwood_thermal.c > @@ -0,0 +1,136 @@ > +/* > + * 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 KIRKWOOD_THERMAL_VALID_OFFSET 9 > +#define KIRKWOOD_THERMAL_VALID_MASK 0x1 > +#define KIRKWOOD_THERMAL_TEMP_OFFSET 10 > +#define KIRKWOOD_THERMAL_TEMP_MASK 0x1FF > + > +/* Kirkwood Thermal Sensor Dev Structure */ > +struct kirkwood_thermal_priv { > + void __iomem *sensor; > +}; > + > +static int kirkwood_get_temp(struct thermal_zone_device *thermal, > + unsigned long *temp) > +{ > + unsigned long reg; > + struct kirkwood_thermal_priv *priv = thermal->devdata; > + > + reg = readl_relaxed(priv->sensor); > + > + /* Valid check */ > + if (!(reg >> KIRKWOOD_THERMAL_VALID_OFFSET) & > + KIRKWOOD_THERMAL_VALID_MASK) { > + dev_err(&thermal->device, > + "Temperature sensor reading not valid\n"); > + return -EIO; > + } > + > + /* > + * Calculate temperature. See Section 8.10.1 of the 88AP510, > + * datasheet, which has the same sensor. > + * Documentation/arm/Marvell/README > + */ > + reg = (reg >> KIRKWOOD_THERMAL_TEMP_OFFSET) & > + KIRKWOOD_THERMAL_TEMP_MASK; > + *temp = ((2281638UL - (7298*reg)) / 10); > + > + return 0; > +} > + > +static struct thermal_zone_device_ops ops = { > + .get_temp = kirkwood_get_temp, > +}; > + > +static const struct of_device_id kirkwood_thermal_id_table[] = { > + { .compatible = "marvell,kirkwood-thermal" }, > + {} > +}; > + > +static int kirkwood_thermal_probe(struct platform_device *pdev) > +{ > + struct thermal_zone_device *thermal = NULL; > + struct kirkwood_thermal_priv *priv; > + 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; > + } > + > + priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL); > + if (!priv) { > + dev_err(&pdev->dev, "kzalloc fail\n"); Not needed, see my answer to the Dove patch. > + 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; > + } > + > + thermal = thermal_zone_device_register("kirkwood_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 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; > +} > + > +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"); > -- > 1.7.10.4 > > > _______________________________________________ > linux-arm-kernel mailing list > linux-arm-kernel@lists.infradead.org > http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
diff --git a/Documentation/devicetree/bindings/thermal/kirkwood-thermal.txt b/Documentation/devicetree/bindings/thermal/kirkwood-thermal.txt new file mode 100644 index 0000000..8c0f5eb --- /dev/null +++ b/Documentation/devicetree/bindings/thermal/kirkwood-thermal.txt @@ -0,0 +1,15 @@ +* Kirkwood Thermal + +This version is for Kirkwood 88F8262 & 88F6283 SoCs. Other kirkwoods +don't contain a thermal sensor. + +Required properties: +- compatible : "marvell,kirkwood-thermal" +- reg : Address range of the thermal registers + +Example: + + thermal@10078 { + compatible = "marvell,kirkwood-thermal"; + reg = <0x10078 0x4>; + }; diff --git a/drivers/thermal/Kconfig b/drivers/thermal/Kconfig index c2c77d1..ff34a0a 100644 --- a/drivers/thermal/Kconfig +++ b/drivers/thermal/Kconfig @@ -93,6 +93,14 @@ config RCAR_THERMAL Enable this to plug the R-Car thermal sensor driver into the Linux thermal framework +config KIRKWOOD_THERMAL + tristate "Temperature sensor on Marvell Kirkwood SoCs" + depends on ARCH_KIRKWOOD + depends on OF + help + Support for the Kirkwood thermal sensor driver into the Linux thermal + framework. Only kirkwood 88F6282 and 88F6283 have this sensor. + config EXYNOS_THERMAL tristate "Temperature sensor on Samsung EXYNOS" depends on (ARCH_EXYNOS4 || ARCH_EXYNOS5) diff --git a/drivers/thermal/Makefile b/drivers/thermal/Makefile index d8da683..99026b2 100644 --- a/drivers/thermal/Makefile +++ b/drivers/thermal/Makefile @@ -15,6 +15,7 @@ obj-$(CONFIG_CPU_THERMAL) += cpu_cooling.o # platform thermal drivers 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-$(CONFIG_DB8500_THERMAL) += db8500_thermal.o obj-$(CONFIG_DB8500_CPUFREQ_COOLING) += db8500_cpufreq_cooling.o diff --git a/drivers/thermal/kirkwood_thermal.c b/drivers/thermal/kirkwood_thermal.c new file mode 100644 index 0000000..000cfc9 --- /dev/null +++ b/drivers/thermal/kirkwood_thermal.c @@ -0,0 +1,136 @@ +/* + * 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 KIRKWOOD_THERMAL_VALID_OFFSET 9 +#define KIRKWOOD_THERMAL_VALID_MASK 0x1 +#define KIRKWOOD_THERMAL_TEMP_OFFSET 10 +#define KIRKWOOD_THERMAL_TEMP_MASK 0x1FF + +/* Kirkwood Thermal Sensor Dev Structure */ +struct kirkwood_thermal_priv { + void __iomem *sensor; +}; + +static int kirkwood_get_temp(struct thermal_zone_device *thermal, + unsigned long *temp) +{ + unsigned long reg; + struct kirkwood_thermal_priv *priv = thermal->devdata; + + reg = readl_relaxed(priv->sensor); + + /* Valid check */ + if (!(reg >> KIRKWOOD_THERMAL_VALID_OFFSET) & + KIRKWOOD_THERMAL_VALID_MASK) { + dev_err(&thermal->device, + "Temperature sensor reading not valid\n"); + return -EIO; + } + + /* + * Calculate temperature. See Section 8.10.1 of the 88AP510, + * datasheet, which has the same sensor. + * Documentation/arm/Marvell/README + */ + reg = (reg >> KIRKWOOD_THERMAL_TEMP_OFFSET) & + KIRKWOOD_THERMAL_TEMP_MASK; + *temp = ((2281638UL - (7298*reg)) / 10); + + return 0; +} + +static struct thermal_zone_device_ops ops = { + .get_temp = kirkwood_get_temp, +}; + +static const struct of_device_id kirkwood_thermal_id_table[] = { + { .compatible = "marvell,kirkwood-thermal" }, + {} +}; + +static int kirkwood_thermal_probe(struct platform_device *pdev) +{ + struct thermal_zone_device *thermal = NULL; + struct kirkwood_thermal_priv *priv; + 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; + } + + priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL); + if (!priv) { + dev_err(&pdev->dev, "kzalloc fail\n"); + 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; + } + + thermal = thermal_zone_device_register("kirkwood_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 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; +} + +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");