From mboxrd@z Thu Jan 1 00:00:00 1970 From: YiPing Xu Subject: Re: [PATCH v1 1/2] thermal: hisilicon: add new hisilicon thermal sensor driver Date: Thu, 26 Mar 2015 17:14:22 +0800 Message-ID: <5513CDEE.8000807@hisilicon.com> References: <1427269825-11324-1-git-send-email-kong.kongxinwei@hisilicon.com> <1427269825-11324-2-git-send-email-kong.kongxinwei@hisilicon.com> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: In-Reply-To: <1427269825-11324-2-git-send-email-kong.kongxinwei@hisilicon.com> Sender: linux-pm-owner@vger.kernel.org To: Xinwei Kong , rui.zhuang@intel.com, edubezval@gmail.com Cc: devicetree@vger.kernel.org, linux-pm@vger.kernel.org, linuxarm@huawei.com, linux-kernel@vger.kernel.org, liguozhu@hisilicon.com, linux-arm-kernel@lists.infradead.org List-Id: devicetree@vger.kernel.org =E5=9C=A8 2015/3/25 15:50, Xinwei Kong =E5=86=99=E9=81=93: > From: kongxinwei > > This patch adds the support for hisilicon thermal sensor, within > hisilicon SoC. there will register sensors for thermal framework > and use device tree to bind cooling device. > > Signed-off-by: Leo Yan > Signed-off-by: kongxinwei > --- > drivers/thermal/Kconfig | 8 + > drivers/thermal/Makefile | 1 + > drivers/thermal/hisi_thermal.c | 526 ++++++++++++++++++++++++++++++= +++++++++++ > 3 files changed, 535 insertions(+) > create mode 100644 drivers/thermal/hisi_thermal.c > > diff --git a/drivers/thermal/Kconfig b/drivers/thermal/Kconfig > index af40db0..81aee01 100644 > --- a/drivers/thermal/Kconfig > +++ b/drivers/thermal/Kconfig > @@ -136,6 +136,14 @@ config THERMAL_EMULATION > because userland can easily disable the thermal policy by simply > flooding this sysfs node with low temperature values. > > +config HISI_THERMAL > + tristate "Hisilicon thermal driver" > + depends on ARCH_HISI && CPU_THERMAL && OF > + help > + Enable this to plug hisilicon's thermal sensor driver into the Li= nux > + thermal framework. cpufreq is used as the cooling device to throt= tle > + CPUs when the passive trip is crossed. > + > config IMX_THERMAL > tristate "Temperature sensor driver for Freescale i.MX SoCs" > depends on CPU_THERMAL > diff --git a/drivers/thermal/Makefile b/drivers/thermal/Makefile > index fa0dc48..08ae7ac 100644 > --- a/drivers/thermal/Makefile > +++ b/drivers/thermal/Makefile > @@ -39,3 +39,4 @@ obj-$(CONFIG_TI_SOC_THERMAL) +=3D ti-soc-thermal/ > obj-$(CONFIG_INT340X_THERMAL) +=3D int340x_thermal/ > obj-$(CONFIG_ST_THERMAL) +=3D st/ > obj-$(CONFIG_TEGRA_SOCTHERM) +=3D tegra_soctherm.o > +obj-$(CONFIG_HISI_THERMAL) +=3D hisi_thermal.o > diff --git a/drivers/thermal/hisi_thermal.c b/drivers/thermal/hisi_th= ermal.c > new file mode 100644 > index 0000000..8edf83a > --- /dev/null > +++ b/drivers/thermal/hisi_thermal.c are you sure all the SOCs in hisilicon use the same thermal IP ? if not, this driver should not use the "hisi_" prefix. > @@ -0,0 +1,526 @@ > +/* > + * Hisilicon thermal sensor driver > + * > + * Copyright (c) 2014-2015 Hisilicon Limited. > + * Copyright (c) 2014-2015 Linaro Limited. > + * > + * Xinwei Kong > + * Leo Yan > + * > + * This program is free software; you can redistribute it and/or mod= ify > + * it under the terms of the GNU General Public License version 2 as > + * published by the Free Software Foundation. > + * > + * This program is distributed "as is" WITHOUT ANY WARRANTY of any > + * kind, whether express or implied; without even the implied warran= ty > + * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the > + * GNU General Public License for more details. > + */ > + > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > + > +#include "thermal_core.h" > + > +#define TEMP0_LAG (0x0) > +#define TEMP0_TH (0x4) > +#define TEMP0_RST_TH (0x8) > +#define TEMP0_CFG (0xC) > +#define TEMP0_EN (0x10) > +#define TEMP0_INT_EN (0x14) > +#define TEMP0_INT_CLR (0x18) > +#define TEMP0_RST_MSK (0x1C) > +#define TEMP0_RAW_INT (0x20) > +#define TEMP0_MSK_INT (0x24) > +#define TEMP0_VALUE (0x28) > + > +#define HISI_TEMP_BASE (-60) > +#define HISI_TEMP_RESET (100000) > +#define HISI_TEMP_PASSIVE (85000) > + > +#define HISI_MAX_SENSORS 4 > + > +struct hisi_thermal_sensor { > + struct hisi_thermal_data *thermal; > + struct thermal_zone_device *tzd; > + const struct thermal_trip *trip; > + > + uint32_t id; > + uint32_t thres_temp, reset_temp; > +}; > + > +struct hisi_thermal_data { > + struct platform_device *pdev; > + struct clk *clk; > + > + int irq, irq_bind_sensor; > + bool irq_enabled; > + > + unsigned int sensors_num; > + long sensor_temp[HISI_MAX_SENSORS]; > + struct hisi_thermal_sensor sensors[HISI_MAX_SENSORS]; > + > + void __iomem *regs; > +}; > + > +static DEFINE_SPINLOCK(thermal_lock); > + "thermal_lock" should be defined in "hisi_thermal_data" to support=20 multi device instance. > +/* in millicelsius */ > +static inline int _step_to_temp(int step) > +{ > + /* > + * Every step equals (1 * 200) / 255 celsius, and finally > + * need convert to millicelsius. > + */ > + return (HISI_TEMP_BASE + (step * 200 / 255)) * 1000; > +} > + > +static inline int _temp_to_step(int temp) > +{ > + return ((temp / 1000 - HISI_TEMP_BASE) * 255 / 200); > +} > + > +static long hisi_thermal_get_sensor_temp(struct hisi_thermal_data *d= ata, > + struct hisi_thermal_sensor *sensor) > +{ > + unsigned long flags; > + int val; > + > + spin_lock_irqsave(&thermal_lock, flags); > + > + /* disable module firstly */ > + writel(0x0, data->regs + TEMP0_EN); > + > + /* select sensor id */ > + writel((sensor->id << 12), data->regs + TEMP0_CFG); > + > + /* enable module */ > + writel(0x1, data->regs + TEMP0_EN); > + > + mdelay(5); > + > + val =3D readl(data->regs + TEMP0_VALUE); > + val =3D _step_to_temp(val); > + > + /* adjust for negative value */ > + val =3D (val < 0) ? 0 : val; > + > + spin_unlock_irqrestore(&thermal_lock, flags); > + > + return val; > +} > + > +static void hisi_thermal_bind_irq(struct hisi_thermal_data *data) > +{ > + struct hisi_thermal_sensor *sensor; > + unsigned long flags; > + > + sensor =3D &data->sensors[data->irq_bind_sensor]; > + > + spin_lock_irqsave(&thermal_lock, flags); > + > + /* setting the hdak time */ > + writel(0x0, data->regs + TEMP0_CFG); > + > + /* disable module firstly */ > + writel(0x0, data->regs + TEMP0_RST_MSK); > + writel(0x0, data->regs + TEMP0_EN); > + > + /* select sensor id */ > + writel((sensor->id << 12), data->regs + TEMP0_CFG); > + > + /* enable for interrupt */ > + writel(_temp_to_step(sensor->thres_temp) > + | 0x0FFFFFF00, data->regs + TEMP0_TH); > + > + writel(_temp_to_step(HISI_TEMP_RESET), data->regs + TEMP0_RST_TH); > + > + /* enable module */ > + writel(0x1, data->regs + TEMP0_RST_MSK); > + writel(0x1, data->regs + TEMP0_EN); > + > + writel(0x0, data->regs + TEMP0_INT_CLR); > + writel(0x1, data->regs + TEMP0_INT_EN); > + > + mdelay(5); > + > + spin_unlock_irqrestore(&thermal_lock, flags); > + > +} > + > +static void hisi_thermal_enable_sensor(struct hisi_thermal_data *dat= a) > +{ > + struct hisi_thermal_sensor *sensor; > + unsigned long flags; > + > + sensor =3D &data->sensors[data->irq_bind_sensor]; > + > + spin_lock_irqsave(&thermal_lock, flags); > + > + /* setting the hdak time */ > + writel(0x0, data->regs + TEMP0_CFG); > + > + /* disable module firstly */ > + writel(0x0, data->regs + TEMP0_RST_MSK); > + writel(0x0, data->regs + TEMP0_EN); > + > + /* select sensor id */ > + writel((sensor->id << 12), data->regs + TEMP0_CFG); > + > + /* enable for interrupt */ > + writel(_temp_to_step(sensor->thres_temp) > + | 0x0FFFFFF00, data->regs + TEMP0_TH); > + > + writel(_temp_to_step(HISI_TEMP_RESET), data->regs + TEMP0_RST_TH); > + > + /* enable module */ > + writel(0x1, data->regs + TEMP0_RST_MSK); > + writel(0x1, data->regs + TEMP0_EN); > + > + writel(0x0, data->regs + TEMP0_INT_CLR); > + writel(0x1, data->regs + TEMP0_INT_EN); > + > + mdelay(5); > + > + spin_unlock_irqrestore(&thermal_lock, flags); > + > +} > + > +static void hisi_thermal_disable_sensor(struct hisi_thermal_data *da= ta) > +{ > + unsigned long flags; > + > + spin_lock_irqsave(&thermal_lock, flags); > + > + /* disable sensor module */ > + writel(0x0, data->regs + TEMP0_INT_EN); > + writel(0x0, data->regs + TEMP0_RST_MSK); > + writel(0x0, data->regs + TEMP0_EN); > + > + spin_unlock_irqrestore(&thermal_lock, flags); > + > +} > + > +static int hisi_thermal_get_temp(void *_sensor, long *temp) > +{ > + struct hisi_thermal_sensor *sensor =3D _sensor; > + struct hisi_thermal_data *data =3D sensor->thermal; > + > + int sensor_id =3D 0, i; > + long max_temp =3D 0; > + > + *temp =3D hisi_thermal_get_sensor_temp(data, sensor); > + > + data->sensor_temp[sensor->id] =3D *temp; > + > + for (i =3D 0; i < HISI_MAX_SENSORS; i++) { > + if (data->sensor_temp[i] >=3D max_temp) { > + max_temp =3D data->sensor_temp[i]; > + sensor_id =3D i; > + } > + } > + > + data->irq_bind_sensor =3D sensor_id; > + > + dev_dbg(&data->pdev->dev, "id=3D%d, irq=3D%d, temp=3D%ld, thres=3D%= d\n", > + sensor->id, data->irq_enabled, *temp, sensor->thres_temp); > + > + /* > + * Bind irq to sensor for two cases: > + * Reenable alarm IRQ if temperature below threshold; > + * if irq has been enabled, always set it; > + */ > + if (!data->irq_enabled && max_temp < sensor->thres_temp) { > + data->irq_enabled =3D true; > + hisi_thermal_bind_irq(data); > + } else if (data->irq_enabled) > + hisi_thermal_bind_irq(data); > + > + return 0; > +} > + > +static struct thermal_zone_of_device_ops hisi_of_thermal_ops =3D { > + .get_temp =3D hisi_thermal_get_temp, > +}; > + > +static irqreturn_t hisi_thermal_alarm_irq(int irq, void *dev) > +{ > + struct hisi_thermal_data *data =3D dev; > + unsigned long flags; > + > + spin_lock_irqsave(&thermal_lock, flags); > + > + /* disable interrupt */ > + writel(0x0, data->regs + TEMP0_INT_EN); > + writel(0x1, data->regs + TEMP0_INT_CLR); > + > + spin_unlock_irqrestore(&thermal_lock, flags); > + data->irq_enabled =3D false; > + > + return IRQ_WAKE_THREAD; > +} > + > +static irqreturn_t hisi_thermal_alarm_irq_thread(int irq, void *dev) > +{ > + struct hisi_thermal_data *data =3D dev; > + struct hisi_thermal_sensor *sensor; > + int i; > + > + sensor =3D &data->sensors[data->irq_bind_sensor]; > + > + dev_crit(&data->pdev->dev, "THERMAL ALARM: T > %d\n", > + sensor->thres_temp / 1000); > + > + for (i =3D 0; i < data->sensors_num; i++) > + thermal_zone_device_update(data->sensors[i].tzd); > + > + return IRQ_HANDLED; > +} > + > +static int hisi_thermal_init_sensor(struct platform_device *pdev, > + struct device_node *np, > + struct hisi_thermal_data *data, > + int index) > +{ > + struct hisi_thermal_sensor *sensor; > + int ret, i; > + > + sensor =3D &data->sensors[index]; > + > + ret =3D of_property_read_u32(np, "hisilicon,tsensor-id", > + &sensor->id); > + if (ret) { > + dev_err(&pdev->dev, "failed to get id %d: %d\n", index, ret); > + return ret; > + } > + > + sensor->thermal =3D data; > + sensor->tzd =3D thermal_zone_of_sensor_register(&pdev->dev, sensor-= >id, > + sensor, &hisi_of_thermal_ops); > + if (IS_ERR(sensor->tzd)) { > + ret =3D PTR_ERR(sensor->tzd); > + dev_err(&pdev->dev, "failed to register sensor id %d: %d\n", > + sensor->id, ret); > + return ret; > + } > + > + sensor->trip =3D of_thermal_get_trip_points(sensor->tzd); > + > + for (i =3D 0; i < of_thermal_get_ntrips(sensor->tzd); i++) { > + if (sensor->trip[i].type =3D=3D THERMAL_TRIP_PASSIVE) { > + sensor->thres_temp =3D sensor->trip[i].temperature; > + break; > + } > + } > + > + return 0; > +} > + > +static int hisi_thermal_get_sensor_data(struct platform_device *pdev= ) > +{ > + struct hisi_thermal_data *data =3D platform_get_drvdata(pdev); > + struct device_node *np =3D pdev->dev.of_node; > + struct device_node *child_np; > + int ret, i, index; > + > + /* sensor initialization */ > + index =3D 0; > + for_each_child_of_node(np, child_np) { > + > + if (index >=3D HISI_MAX_SENSORS) { > + dev_err(&pdev->dev, "unsupported sensor number\n"); > + ret =3D -EINVAL; > + goto err_init_sensors; > + } > + > + ret =3D hisi_thermal_init_sensor(pdev, child_np, data, index); > + if (ret) > + goto err_init_sensors; > + > + index++; > + } > + > + data->sensors_num =3D index; > + return 0; > + > +err_init_sensors: > + for (i =3D 0; i < index; i++) > + thermal_zone_of_sensor_unregister(&pdev->dev, > + data->sensors[i].tzd); > + return ret; > +} > + > +static const struct of_device_id of_hisi_thermal_match[] =3D { > + { .compatible =3D "hisilicon,tsensor" }, > + { /* end */ } > +}; > +MODULE_DEVICE_TABLE(of, of_hisi_thermal_match); > + > +static void hisi_thermal_toggle_sensor(struct hisi_thermal_sensor *s= ensor, > + bool on) > +{ > + struct thermal_zone_device *tzd =3D sensor->tzd; > + > + tzd->ops->set_mode(tzd, > + on ? THERMAL_DEVICE_ENABLED : THERMAL_DEVICE_DISABLED); > +} > + > +static int hisi_thermal_probe(struct platform_device *pdev) > +{ > + struct hisi_thermal_data *data; > + struct resource *res; > + int i; > + int ret; > + > + data =3D devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL); > + if (!data) > + return -ENOMEM; > + > + data->pdev =3D pdev; > + > + res =3D platform_get_resource(pdev, IORESOURCE_MEM, 0); > + data->regs =3D devm_ioremap_resource(&pdev->dev, res); > + if (IS_ERR(data->regs)) { > + dev_err(&pdev->dev, "failed to get io address\n"); > + return PTR_ERR(data->regs); > + } > + > + data->irq =3D platform_get_irq(pdev, 0); > + if (data->irq < 0) > + return data->irq; > + > + ret =3D devm_request_threaded_irq(&pdev->dev, data->irq, > + hisi_thermal_alarm_irq, hisi_thermal_alarm_irq_thread, > + 0, "hisi_thermal", data); > + if (ret < 0) { > + dev_err(&pdev->dev, "failed to request alarm irq: %d\n", ret); > + return ret; > + } > + > + platform_set_drvdata(pdev, data); > + > + data->clk =3D devm_clk_get(&pdev->dev, "thermal_clk"); > + if (IS_ERR(data->clk)) { > + ret =3D PTR_ERR(data->clk); > + if (ret !=3D -EPROBE_DEFER) > + dev_err(&pdev->dev, > + "failed to get thermal clk: %d\n", ret); > + return ret; > + } > + > + /* enable clock for thermal */ > + ret =3D clk_prepare_enable(data->clk); > + if (ret) { > + dev_err(&pdev->dev, "failed to enable thermal clk: %d\n", ret); > + return ret; > + } > + > + ret =3D hisi_thermal_get_sensor_data(pdev); > + if (ret) { > + dev_err(&pdev->dev, "failed to get sensor data\n"); > + goto err_get_sensor_data; > + return ret; > + } > + > + hisi_thermal_enable_sensor(data); > + data->irq_enabled =3D true; > + > + for (i =3D 0; i < data->sensors_num; i++) > + hisi_thermal_toggle_sensor(&data->sensors[i], true); > + > + return 0; > + > +err_get_sensor_data: > + clk_disable_unprepare(data->clk); > + return ret; > +} > + > +static int hisi_thermal_remove(struct platform_device *pdev) > +{ > + struct hisi_thermal_data *data =3D platform_get_drvdata(pdev); > + int i; > + > + for (i =3D 0; i < data->sensors_num; i++) { > + struct hisi_thermal_sensor *sensor =3D &data->sensors[i]; > + > + hisi_thermal_toggle_sensor(sensor, false); > + thermal_zone_of_sensor_unregister(&pdev->dev, sensor->tzd); > + } > + > + hisi_thermal_disable_sensor(data); > + clk_disable_unprepare(data->clk); > + return 0; > +} > + > +#ifdef CONFIG_PM_SLEEP > +static int hisi_thermal_suspend(struct device *dev) > +{ > + struct hisi_thermal_data *data =3D dev_get_drvdata(dev); > + > + hisi_thermal_disable_sensor(data); > + data->irq_enabled =3D false; > + > + clk_disable_unprepare(data->clk); > + > + return 0; > +} > + > +static int hisi_thermal_resume(struct device *dev) > +{ > + struct hisi_thermal_data *data =3D dev_get_drvdata(dev); > + > + clk_prepare_enable(data->clk); > + > + data->irq_enabled =3D true; > + hisi_thermal_enable_sensor(data); > + > + return 0; > +} > +#endif > + > +static SIMPLE_DEV_PM_OPS(hisi_thermal_pm_ops, > + hisi_thermal_suspend, hisi_thermal_resume); > + > +static struct platform_driver hisi_thermal_driver =3D { > + .driver =3D { > + .name =3D "hisi_thermal", > + .owner =3D THIS_MODULE, > + .pm =3D &hisi_thermal_pm_ops, > + .of_match_table =3D of_hisi_thermal_match, > + }, > + .probe =3D hisi_thermal_probe, > + .remove =3D hisi_thermal_remove, > +}; > + > +static int __init hisi_thermal_init(void) > +{ > + return platform_driver_register(&hisi_thermal_driver); > +} > + > +static void __exit hisi_thermal_exit(void) > +{ > + platform_driver_unregister(&hisi_thermal_driver); > +} > + > +late_initcall(hisi_thermal_init); > +module_exit(hisi_thermal_exit); > + > +MODULE_AUTHOR("Xinwei Kong "); > +MODULE_AUTHOR("Leo Yan "); > +MODULE_DESCRIPTION("Hisilicon thermal driver"); > +MODULE_LICENSE("GPL v2"); >