| Message ID | 1486429001-31940-1-git-send-email-baoyou.xie@linaro.org |
|---|---|
| State | Accepted |
| Commit | e0fa56489f21e319d0aa9654834209faa3eb481d |
| Headers | show |
| Series | [v9,1/3] dt: bindings: add documentation for zx2967 family thermal sensor | expand |
On Tue, Feb 07, 2017 at 08:56:41AM +0800, Baoyou Xie wrote: > This patch adds thermal driver for ZTE's zx2967 family. > > Signed-off-by: Baoyou Xie <baoyou.xie@linaro.org> Reviewed-by: Mathieu Poirier <mathieu.poirier@linaro.org> > --- > drivers/thermal/Kconfig | 8 ++ > drivers/thermal/Makefile | 1 + > drivers/thermal/zx2967_thermal.c | 258 +++++++++++++++++++++++++++++++++++++++ > 3 files changed, 267 insertions(+) > create mode 100644 drivers/thermal/zx2967_thermal.c > > diff --git a/drivers/thermal/Kconfig b/drivers/thermal/Kconfig > index 18f2de6..f64bd50 100644 > --- a/drivers/thermal/Kconfig > +++ b/drivers/thermal/Kconfig > @@ -444,4 +444,12 @@ config BCM2835_THERMAL > help > Support for thermal sensors on Broadcom bcm2835 SoCs. > > +config ZX2967_THERMAL > + tristate "Thermal sensors on zx2967 SoC" > + depends on ARCH_ZX || COMPILE_TEST > + help > + Enable the zx2967 thermal sensors driver, which supports > + the primitive temperature sensor embedded in zx2967 SoCs. > + This sensor generates the real time die temperature. > + > endif > diff --git a/drivers/thermal/Makefile b/drivers/thermal/Makefile > index 677c6d9..c00c05e 100644 > --- a/drivers/thermal/Makefile > +++ b/drivers/thermal/Makefile > @@ -57,3 +57,4 @@ obj-$(CONFIG_HISI_THERMAL) += hisi_thermal.o > obj-$(CONFIG_MTK_THERMAL) += mtk_thermal.o > obj-$(CONFIG_GENERIC_ADC_THERMAL) += thermal-generic-adc.o > obj-$(CONFIG_BCM2835_THERMAL) += bcm2835_thermal.o > +obj-$(CONFIG_ZX2967_THERMAL) += zx2967_thermal.o > diff --git a/drivers/thermal/zx2967_thermal.c b/drivers/thermal/zx2967_thermal.c > new file mode 100644 > index 0000000..a5670ad > --- /dev/null > +++ b/drivers/thermal/zx2967_thermal.c > @@ -0,0 +1,258 @@ > +/* > + * ZTE's zx2967 family thermal sensor driver > + * > + * Copyright (C) 2017 ZTE Ltd. > + * > + * Author: Baoyou Xie <baoyou.xie@linaro.org> > + * > + * License terms: GNU General Public License (GPL) version 2 > + */ > + > +#include <linux/clk.h> > +#include <linux/device.h> > +#include <linux/err.h> > +#include <linux/iopoll.h> > +#include <linux/module.h> > +#include <linux/platform_device.h> > +#include <linux/thermal.h> > + > +/* Power Mode: 0->low 1->high */ > +#define ZX2967_THERMAL_POWER_MODE 0 > +#define ZX2967_POWER_MODE_LOW 0 > +#define ZX2967_POWER_MODE_HIGH 1 > + > +/* DCF Control Register */ > +#define ZX2967_THERMAL_DCF 0x4 > +#define ZX2967_DCF_EN BIT(1) > +#define ZX2967_DCF_FREEZE BIT(0) > + > +/* Selection Register */ > +#define ZX2967_THERMAL_SEL 0x8 > + > +/* Control Register */ > +#define ZX2967_THERMAL_CTRL 0x10 > + > +#define ZX2967_THERMAL_READY BIT(12) > +#define ZX2967_THERMAL_TEMP_MASK GENMASK(11, 0) > +#define ZX2967_THERMAL_ID_MASK 0x18 > +#define ZX2967_THERMAL_ID 0x10 > + > +#define ZX2967_GET_TEMP_TIMEOUT_US (100 * 1024) > + > +/** > + * struct zx2967_thermal_priv - zx2967 thermal sensor private structure > + * @tzd: struct thermal_zone_device where the sensor is registered > + * @lock: prevents read sensor in parallel > + * @clk_topcrm: topcrm clk structure > + * @clk_apb: apb clk structure > + * @regs: pointer to base address of the thermal sensor > + */ > + > +struct zx2967_thermal_priv { > + struct thermal_zone_device *tzd; > + struct mutex lock; > + struct clk *clk_topcrm; > + struct clk *clk_apb; > + void __iomem *regs; > + struct device *dev; > +}; > + > +static int zx2967_thermal_get_temp(void *data, int *temp) > +{ > + void __iomem *regs; > + struct zx2967_thermal_priv *priv = data; > + u32 val; > + int ret; > + > + if (!priv->tzd) > + return -EAGAIN; > + > + regs = priv->regs; > + mutex_lock(&priv->lock); > + writel_relaxed(ZX2967_POWER_MODE_LOW, > + regs + ZX2967_THERMAL_POWER_MODE); > + writel_relaxed(ZX2967_DCF_EN, regs + ZX2967_THERMAL_DCF); > + > + val = readl_relaxed(regs + ZX2967_THERMAL_SEL); > + val &= ~ZX2967_THERMAL_ID_MASK; > + val |= ZX2967_THERMAL_ID; > + writel_relaxed(val, regs + ZX2967_THERMAL_SEL); > + > + /* > + * Must wait for a while, surely it's a bit odd. > + * otherwise temperature value we got has a few deviation, even if > + * the THERMAL_READY bit is set. > + */ > + usleep_range(100, 300); > + ret = readx_poll_timeout(readl, regs + ZX2967_THERMAL_CTRL, > + val, val & ZX2967_THERMAL_READY, 300, > + ZX2967_GET_TEMP_TIMEOUT_US); > + if (ret) { > + dev_err(priv->dev, "Thermal sensor data timeout\n"); > + goto unlock; > + } > + > + writel_relaxed(ZX2967_DCF_FREEZE | ZX2967_DCF_EN, > + regs + ZX2967_THERMAL_DCF); > + val = readl_relaxed(regs + ZX2967_THERMAL_CTRL) > + & ZX2967_THERMAL_TEMP_MASK; > + writel_relaxed(ZX2967_POWER_MODE_HIGH, > + regs + ZX2967_THERMAL_POWER_MODE); > + > + /* > + * Calculate temperature > + * In dts, slope is multiplied by 1000. > + */ > + *temp = DIV_ROUND_CLOSEST(((s32)val + priv->tzd->tzp->offset) * 1000, > + priv->tzd->tzp->slope); > + > +unlock: > + mutex_unlock(&priv->lock); > + return ret; > +} > + > +static struct thermal_zone_of_device_ops zx2967_of_thermal_ops = { > + .get_temp = zx2967_thermal_get_temp, > +}; > + > +static int zx2967_thermal_probe(struct platform_device *pdev) > +{ > + struct zx2967_thermal_priv *priv; > + struct resource *res; > + int ret; > + > + priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL); > + if (!priv) > + return -ENOMEM; > + > + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); > + priv->regs = devm_ioremap_resource(&pdev->dev, res); > + if (IS_ERR(priv->regs)) > + return PTR_ERR(priv->regs); > + > + priv->clk_topcrm = devm_clk_get(&pdev->dev, "topcrm"); > + if (IS_ERR(priv->clk_topcrm)) { > + ret = PTR_ERR(priv->clk_topcrm); > + dev_err(&pdev->dev, "failed to get topcrm clock: %d\n", ret); > + return ret; > + } > + > + ret = clk_prepare_enable(priv->clk_topcrm); > + if (ret) { > + dev_err(&pdev->dev, "failed to enable topcrm clock: %d\n", > + ret); > + return ret; > + } > + > + priv->clk_apb = devm_clk_get(&pdev->dev, "apb"); > + if (IS_ERR(priv->clk_apb)) { > + ret = PTR_ERR(priv->clk_apb); > + dev_err(&pdev->dev, "failed to get apb clock: %d\n", ret); > + goto disable_clk_topcrm; > + } > + > + ret = clk_prepare_enable(priv->clk_apb); > + if (ret) { > + dev_err(&pdev->dev, "failed to enable apb clock: %d\n", > + ret); > + goto disable_clk_topcrm; > + } > + > + mutex_init(&priv->lock); > + priv->tzd = thermal_zone_of_sensor_register(&pdev->dev, > + 0, priv, &zx2967_of_thermal_ops); > + > + if (IS_ERR(priv->tzd)) { > + ret = PTR_ERR(priv->tzd); > + dev_err(&pdev->dev, "failed to register sensor: %d\n", ret); > + goto disable_clk_all; > + } > + > + if (priv->tzd->tzp->slope == 0) { > + thermal_zone_of_sensor_unregister(&pdev->dev, priv->tzd); > + dev_err(&pdev->dev, "coefficients of sensor is invalid\n"); > + ret = -EINVAL; > + goto disable_clk_all; > + } > + > + priv->dev = &pdev->dev; > + platform_set_drvdata(pdev, priv); > + > + return 0; > + > +disable_clk_all: > + clk_disable_unprepare(priv->clk_apb); > +disable_clk_topcrm: > + clk_disable_unprepare(priv->clk_topcrm); > + return ret; > +} > + > +static int zx2967_thermal_exit(struct platform_device *pdev) > +{ > + struct zx2967_thermal_priv *priv = platform_get_drvdata(pdev); > + > + thermal_zone_of_sensor_unregister(&pdev->dev, priv->tzd); > + clk_disable_unprepare(priv->clk_topcrm); > + clk_disable_unprepare(priv->clk_apb); > + > + return 0; > +} > + > +static const struct of_device_id zx2967_thermal_id_table[] = { > + { .compatible = "zte,zx296718-thermal" }, > + {} > +}; > +MODULE_DEVICE_TABLE(of, zx2967_thermal_id_table); > + > +#ifdef CONFIG_PM_SLEEP > +static int zx2967_thermal_suspend(struct device *dev) > +{ > + struct platform_device *pdev = to_platform_device(dev); > + struct zx2967_thermal_priv *priv = platform_get_drvdata(pdev); > + > + if (priv && priv->clk_topcrm) > + clk_disable_unprepare(priv->clk_topcrm); > + > + if (priv && priv->clk_apb) > + clk_disable_unprepare(priv->clk_apb); > + > + return 0; > +} > + > +static int zx2967_thermal_resume(struct device *dev) > +{ > + struct platform_device *pdev = to_platform_device(dev); > + struct zx2967_thermal_priv *priv = platform_get_drvdata(pdev); > + int error; > + > + error = clk_prepare_enable(priv->clk_topcrm); > + if (error) > + return error; > + > + error = clk_prepare_enable(priv->clk_apb); > + if (error) { > + clk_disable_unprepare(priv->clk_topcrm); > + return error; > + } > + > + return 0; > +} > +#endif > + > +static SIMPLE_DEV_PM_OPS(zx2967_thermal_pm_ops, > + zx2967_thermal_suspend, zx2967_thermal_resume); > + > +static struct platform_driver zx2967_thermal_driver = { > + .probe = zx2967_thermal_probe, > + .remove = zx2967_thermal_exit, > + .driver = { > + .name = "zx2967_thermal", > + .of_match_table = zx2967_thermal_id_table, > + .pm = &zx2967_thermal_pm_ops, > + }, > +}; > +module_platform_driver(zx2967_thermal_driver); > + > +MODULE_AUTHOR("Baoyou Xie <baoyou.xie@linaro.org>"); > +MODULE_DESCRIPTION("ZTE zx2967 thermal driver"); > +MODULE_LICENSE("GPL v2"); > -- > 2.7.4 > -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
diff --git a/Documentation/devicetree/bindings/thermal/zx2967-thermal.txt b/Documentation/devicetree/bindings/thermal/zx2967-thermal.txt new file mode 100644 index 0000000..0810644 --- /dev/null +++ b/Documentation/devicetree/bindings/thermal/zx2967-thermal.txt @@ -0,0 +1,116 @@ +* ZTE zx2967 family Thermal + +Required Properties: +- compatible: should be one of the following. + * zte,zx296718-thermal +- reg: physical base address of the controller and length of memory mapped + region. +- clocks : Pairs of phandle and specifier referencing the controller's clocks. +- clock-names: "topcrm" for the topcrm clock. + "apb" for the apb clock. +- #thermal-sensor-cells: must be 0. + +Please note: slope coefficient defined in thermal-zones section need to be +multiplied by 1000. + +Example for tempsensor: + + tempsensor: tempsensor@148a000 { + compatible = "zte,zx296718-thermal"; + reg = <0x0148a000 0x20>; + clocks = <&topcrm TEMPSENSOR_GATE>, <&audiocrm AUDIO_TS_PCLK>; + clock-names = "topcrm", "apb"; + #thermal-sensor-cells = <0>; + }; + +Example for cooling device: + + cooling_dev: cooling_dev { + cluster0_cooling_dev: cluster0-cooling-dev { + #cooling-cells = <2>; + cpumask = <0xf>; + capacitance = <1500>; + }; + + cluster1_cooling_dev: cluster1-cooling-dev { + #cooling-cells = <2>; + cpumask = <0x30>; + capacitance = <2000>; + }; + }; + +Example for thermal zones: + + thermal-zones { + zx296718_thermal: zx296718_thermal { + polling-delay-passive = <500>; + polling-delay = <1000>; + sustainable-power = <6500>; + + thermal-sensors = <&tempsensor 0>; + /* + * slope need to be multiplied by 1000. + */ + coefficients = <1951 (-922)>; + + trips { + trip0: switch_on_temperature { + temperature = <90000>; + hysteresis = <2000>; + type = "passive"; + }; + + trip1: desired_temperature { + temperature = <100000>; + hysteresis = <2000>; + type = "passive"; + }; + + crit: critical_temperature { + temperature = <110000>; + hysteresis = <2000>; + type = "critical"; + }; + }; + + cooling-maps { + map0 { + trip = <&trip0>; + cooling-device = <&gpu 2 5>; + }; + + map1 { + trip = <&trip0>; + cooling-device = <&cluster0_cooling_dev 1 2>; + }; + + map2 { + trip = <&trip1>; + cooling-device = <&cluster0_cooling_dev 1 2>; + }; + + map3 { + trip = <&crit>; + cooling-device = <&cluster0_cooling_dev 1 2>; + }; + + map4 { + trip = <&trip0>; + cooling-device = <&cluster1_cooling_dev 1 2>; + contribution = <9000>; + }; + + map5 { + trip = <&trip1>; + cooling-device = <&cluster1_cooling_dev 1 2>; + contribution = <4096>; + }; + + map6 { + trip = <&crit>; + cooling-device = <&cluster1_cooling_dev 1 2>; + contribution = <4096>; + }; + }; + }; + };