+++ /dev/null
-* 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>;
- };
- };
- };
- };
+++ /dev/null
-// SPDX-License-Identifier: GPL-2.0-only
-/*
- * ZTE's zx2967 family thermal sensor driver
- *
- * Copyright (C) 2017 ZTE Ltd.
- *
- * Author: Baoyou Xie <baoyou.xie@linaro.org>
- */
-
-#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
- * @dev: struct device pointer
- */
-
-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 const 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 zx2967_thermal_priv *priv = dev_get_drvdata(dev);
-
- 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 zx2967_thermal_priv *priv = dev_get_drvdata(dev);
- 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");
projects / linux-2.6-block.git / commitdiff