The device file adds the device support for OMAP4 on die temperature sensor. Signed-off-by: Keerthy <j-keerthy@xxxxxx> Cc: tony@xxxxxxxxxxx --- arch/arm/mach-omap2/Makefile | 1 + arch/arm/mach-omap2/temp_sensor_device.c | 178 ++++++++++++++++++++++++++++++ arch/arm/plat-omap/Kconfig | 12 ++ 3 files changed, 191 insertions(+), 0 deletions(-) create mode 100644 arch/arm/mach-omap2/temp_sensor_device.c diff --git a/arch/arm/mach-omap2/Makefile b/arch/arm/mach-omap2/Makefile index 2d5d981..5812fb4 100644 --- a/arch/arm/mach-omap2/Makefile +++ b/arch/arm/mach-omap2/Makefile @@ -18,6 +18,7 @@ obj-$(CONFIG_ARCH_OMAP4) += prm44xx.o $(hwmod-common) obj-$(CONFIG_OMAP_MCBSP) += mcbsp.o +obj-$(CONFIG_OMAP_TEMP_SENSOR) += temp_sensor_device.o obj-$(CONFIG_TWL4030_CORE) += omap_twl.o # SMP support ONLY available for OMAP4 diff --git a/arch/arm/mach-omap2/temp_sensor_device.c b/arch/arm/mach-omap2/temp_sensor_device.c new file mode 100644 index 0000000..083f267 --- /dev/null +++ b/arch/arm/mach-omap2/temp_sensor_device.c @@ -0,0 +1,178 @@ +/* + * OMAP on die Temperature sensor device file + * + * Copyright (C) 2011 Texas Instruments Incorporated - http://www.ti.com/ + * Author: J Keerthy <j-keerthy@xxxxxx> + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * version 2 as published by the Free Software Foundation. + * + * 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. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA + * 02110-1301 USA + * + */ + +#include <linux/delay.h> +#include <linux/slab.h> +#include <linux/io.h> +#include <linux/mutex.h> +#include <linux/idr.h> +#include <plat/omap_device.h> +#include "pm.h" +#include <plat/temperature_sensor.h> + + +int omap_temp_sensor_device_idle(struct omap_device *od) +{ + struct omap_temp_sensor_registers *registers; + struct resource *mem; + void __iomem *phy_base; + unsigned long timeout; + u32 ret = 0, temp; + + mem = platform_get_resource(&od->pdev, IORESOURCE_MEM, 0); + if (!mem) { + dev_err(&od->pdev.dev, "no mem resource\n"); + ret = -EINVAL; + goto plat_res_err; + } + + phy_base = ioremap(mem->start, resource_size(mem)); + + if (!strcmp(od->hwmods[0]->dev_attr, "mpu")) + registers = &omap_mpu_temp_sensor_registers; + + temp = __raw_readl(phy_base + registers->temp_sensor_ctrl); + temp |= registers->bgap_tempsoff_mask; + + /* BGAP_TEMPSOFF should be set to 1 before gating clock */ + __raw_writel(temp, phy_base + registers->temp_sensor_ctrl); + temp = __raw_readl(phy_base + registers->bgap_status); + timeout = jiffies + msecs_to_jiffies(5); + + /* wait till the clean stop bit is set or till the timeout expires */ + while (!(temp | registers->status_clean_stop_mask) && + !(time_after(jiffies, timeout))) { + temp = __raw_readl(phy_base + registers->bgap_status); + usleep_range(500, 2000); + } + + if (time_after(jiffies, timeout)) + dev_err(&od->pdev.dev, "Clean stop bit not set\n"); + + ret = omap_device_idle_hwmods(od); + +plat_res_err: + return ret; +} + +int omap_temp_sensor_device_activate(struct omap_device *od) +{ + struct omap_temp_sensor_registers *registers; + struct resource *mem; + void __iomem *phy_base; + u32 ret = 0, temp; + + ret = omap_device_enable_hwmods(od); + if (ret < 0) + return ret; + mem = platform_get_resource(&od->pdev, IORESOURCE_MEM, 0); + if (!mem) { + dev_err(&od->pdev.dev, "no mem resource\n"); + return -EINVAL; + } + + phy_base = ioremap(mem->start, resource_size(mem)); + + if (!strcmp(od->hwmods[0]->dev_attr, "mpu")) + registers = &omap_mpu_temp_sensor_registers; + + temp = __raw_readl(phy_base + registers->temp_sensor_ctrl); + temp &= ~(registers->bgap_tempsoff_mask); + /* BGAP_TEMPSOFF should be reset to 0 */ + __raw_writel(temp, + phy_base + registers->temp_sensor_ctrl); + + return 0; +} + +static struct omap_device_pm_latency omap_temp_sensor_latency[] = { + { + .deactivate_func = omap_temp_sensor_device_idle, + .activate_func = omap_temp_sensor_device_activate, + .flags = OMAP_DEVICE_LATENCY_AUTO_ADJUST, + } +}; + +static DEFINE_IDR(temp_sensor_device_idr); + +static int temp_sensor_dev_init(struct omap_hwmod *oh, void *user) +{ + struct omap_temp_sensor_pdata *temp_sensor_pdata; + struct omap_device *od; + struct omap_temp_sensor_dev_attr *temp_sensor_dev_attr; + int ret = 0; + int num; + struct mutex sensor_mutex; /* sensor mutex */ + + mutex_init(&sensor_mutex); + + temp_sensor_pdata = + kzalloc(sizeof(*temp_sensor_pdata), GFP_KERNEL); + if (!temp_sensor_pdata) { + dev_err(&oh->od->pdev.dev, + "Unable to allocate memory for temp sensor pdata\n"); + return -ENOMEM; + } + + mutex_lock(&sensor_mutex); + ret = idr_pre_get(&temp_sensor_device_idr, GFP_KERNEL); + if (ret < 0) { + mutex_unlock(&sensor_mutex); + goto fail_id; + } + ret = idr_get_new(&temp_sensor_device_idr, temp_sensor_pdata, &num); + if (ret < 0) { + mutex_unlock(&sensor_mutex); + goto fail_id; + } + mutex_unlock(&sensor_mutex); + + temp_sensor_dev_attr = oh->dev_attr; + if (!strcmp(temp_sensor_dev_attr->name, "mpu")) + temp_sensor_pdata->registers = &omap_mpu_temp_sensor_registers; + + od = omap_device_build("omap_temp_sensor", num, + oh, temp_sensor_pdata, sizeof(*temp_sensor_pdata), + omap_temp_sensor_latency, + ARRAY_SIZE(omap_temp_sensor_latency), 0); + if (IS_ERR(od)) { + dev_warn(&oh->od->pdev.dev, + "Could not build omap_device for %s\n", oh->name); + ret = PTR_ERR(od); + } + +fail_id: + kfree(temp_sensor_pdata); + + return ret; +} + +int __init omap_devinit_temp_sensor(void) +{ + if (!cpu_is_omap446x()) + return 0; + + return omap_hwmod_for_each_by_class("temperature_sensor", + temp_sensor_dev_init, NULL); +} + +arch_initcall(omap_devinit_temp_sensor); diff --git a/arch/arm/plat-omap/Kconfig b/arch/arm/plat-omap/Kconfig index 6e6735f..8fd8e80 100644 --- a/arch/arm/plat-omap/Kconfig +++ b/arch/arm/plat-omap/Kconfig @@ -115,6 +115,18 @@ config OMAP_MCBSP Say Y here if you want support for the OMAP Multichannel Buffered Serial Port. +config OMAP_TEMP_SENSOR + bool "OMAP Temp Sensor Support" + depends on ARCH_OMAP + default n + help + Say Y here if you want support for the temp sensor + on OMAP4460. + + This provides the temperature of the MPU + subsystem. Only one instance of on die temperature + sensor is present. + config OMAP_MBOX_FWK tristate "Mailbox framework support" depends on ARCH_OMAP -- 1.7.0.4 -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
