thermal: zx2967: add thermal driver for ZTE's zx2967 family
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> Signed-off-by: Eduardo Valentin <edubezval@gmail.com>
This commit is contained in:
Baoyou Xie
Eduardo Valentin
Родитель
e0fa56489f
Коммит
50fdd36f33
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@ -445,4 +445,12 @@ depends on (ARCH_QCOM && OF) || COMPILE_TEST
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source "drivers/thermal/qcom/Kconfig"
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endmenu
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config ZX2967_THERMAL
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tristate "Thermal sensors on zx2967 SoC"
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depends on ARCH_ZX || COMPILE_TEST
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help
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Enable the zx2967 thermal sensors driver, which supports
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the primitive temperature sensor embedded in zx2967 SoCs.
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This sensor generates the real time die temperature.
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endif
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@ -57,3 +57,4 @@ obj-$(CONFIG_TEGRA_SOCTHERM) += tegra/
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obj-$(CONFIG_HISI_THERMAL) += hisi_thermal.o
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obj-$(CONFIG_MTK_THERMAL) += mtk_thermal.o
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obj-$(CONFIG_GENERIC_ADC_THERMAL) += thermal-generic-adc.o
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obj-$(CONFIG_ZX2967_THERMAL) += zx2967_thermal.o
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@ -0,0 +1,258 @@
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/*
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* ZTE's zx2967 family thermal sensor driver
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*
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* Copyright (C) 2017 ZTE Ltd.
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*
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* Author: Baoyou Xie <baoyou.xie@linaro.org>
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*
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* License terms: GNU General Public License (GPL) version 2
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*/
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#include <linux/clk.h>
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#include <linux/device.h>
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#include <linux/err.h>
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#include <linux/iopoll.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/thermal.h>
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/* Power Mode: 0->low 1->high */
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#define ZX2967_THERMAL_POWER_MODE 0
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#define ZX2967_POWER_MODE_LOW 0
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#define ZX2967_POWER_MODE_HIGH 1
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/* DCF Control Register */
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#define ZX2967_THERMAL_DCF 0x4
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#define ZX2967_DCF_EN BIT(1)
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#define ZX2967_DCF_FREEZE BIT(0)
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/* Selection Register */
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#define ZX2967_THERMAL_SEL 0x8
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/* Control Register */
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#define ZX2967_THERMAL_CTRL 0x10
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#define ZX2967_THERMAL_READY BIT(12)
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#define ZX2967_THERMAL_TEMP_MASK GENMASK(11, 0)
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#define ZX2967_THERMAL_ID_MASK 0x18
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#define ZX2967_THERMAL_ID 0x10
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#define ZX2967_GET_TEMP_TIMEOUT_US (100 * 1024)
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/**
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* struct zx2967_thermal_priv - zx2967 thermal sensor private structure
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* @tzd: struct thermal_zone_device where the sensor is registered
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* @lock: prevents read sensor in parallel
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* @clk_topcrm: topcrm clk structure
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* @clk_apb: apb clk structure
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* @regs: pointer to base address of the thermal sensor
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*/
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struct zx2967_thermal_priv {
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struct thermal_zone_device *tzd;
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struct mutex lock;
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struct clk *clk_topcrm;
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struct clk *clk_apb;
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void __iomem *regs;
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struct device *dev;
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};
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static int zx2967_thermal_get_temp(void *data, int *temp)
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{
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void __iomem *regs;
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struct zx2967_thermal_priv *priv = data;
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u32 val;
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int ret;
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if (!priv->tzd)
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return -EAGAIN;
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regs = priv->regs;
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mutex_lock(&priv->lock);
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writel_relaxed(ZX2967_POWER_MODE_LOW,
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regs + ZX2967_THERMAL_POWER_MODE);
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writel_relaxed(ZX2967_DCF_EN, regs + ZX2967_THERMAL_DCF);
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val = readl_relaxed(regs + ZX2967_THERMAL_SEL);
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val &= ~ZX2967_THERMAL_ID_MASK;
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val |= ZX2967_THERMAL_ID;
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writel_relaxed(val, regs + ZX2967_THERMAL_SEL);
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/*
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* Must wait for a while, surely it's a bit odd.
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* otherwise temperature value we got has a few deviation, even if
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* the THERMAL_READY bit is set.
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*/
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usleep_range(100, 300);
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ret = readx_poll_timeout(readl, regs + ZX2967_THERMAL_CTRL,
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val, val & ZX2967_THERMAL_READY, 300,
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ZX2967_GET_TEMP_TIMEOUT_US);
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if (ret) {
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dev_err(priv->dev, "Thermal sensor data timeout\n");
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goto unlock;
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}
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writel_relaxed(ZX2967_DCF_FREEZE | ZX2967_DCF_EN,
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regs + ZX2967_THERMAL_DCF);
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val = readl_relaxed(regs + ZX2967_THERMAL_CTRL)
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& ZX2967_THERMAL_TEMP_MASK;
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writel_relaxed(ZX2967_POWER_MODE_HIGH,
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regs + ZX2967_THERMAL_POWER_MODE);
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/*
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* Calculate temperature
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* In dts, slope is multiplied by 1000.
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*/
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*temp = DIV_ROUND_CLOSEST(((s32)val + priv->tzd->tzp->offset) * 1000,
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priv->tzd->tzp->slope);
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unlock:
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mutex_unlock(&priv->lock);
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return ret;
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}
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static struct thermal_zone_of_device_ops zx2967_of_thermal_ops = {
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.get_temp = zx2967_thermal_get_temp,
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};
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static int zx2967_thermal_probe(struct platform_device *pdev)
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{
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struct zx2967_thermal_priv *priv;
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struct resource *res;
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int ret;
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priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
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if (!priv)
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return -ENOMEM;
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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priv->regs = devm_ioremap_resource(&pdev->dev, res);
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if (IS_ERR(priv->regs))
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return PTR_ERR(priv->regs);
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priv->clk_topcrm = devm_clk_get(&pdev->dev, "topcrm");
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if (IS_ERR(priv->clk_topcrm)) {
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ret = PTR_ERR(priv->clk_topcrm);
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dev_err(&pdev->dev, "failed to get topcrm clock: %d\n", ret);
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return ret;
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}
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ret = clk_prepare_enable(priv->clk_topcrm);
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if (ret) {
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dev_err(&pdev->dev, "failed to enable topcrm clock: %d\n",
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ret);
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return ret;
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}
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priv->clk_apb = devm_clk_get(&pdev->dev, "apb");
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if (IS_ERR(priv->clk_apb)) {
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ret = PTR_ERR(priv->clk_apb);
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dev_err(&pdev->dev, "failed to get apb clock: %d\n", ret);
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goto disable_clk_topcrm;
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}
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ret = clk_prepare_enable(priv->clk_apb);
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if (ret) {
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dev_err(&pdev->dev, "failed to enable apb clock: %d\n",
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ret);
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goto disable_clk_topcrm;
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}
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mutex_init(&priv->lock);
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priv->tzd = thermal_zone_of_sensor_register(&pdev->dev,
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0, priv, &zx2967_of_thermal_ops);
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if (IS_ERR(priv->tzd)) {
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ret = PTR_ERR(priv->tzd);
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dev_err(&pdev->dev, "failed to register sensor: %d\n", ret);
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goto disable_clk_all;
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}
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if (priv->tzd->tzp->slope == 0) {
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thermal_zone_of_sensor_unregister(&pdev->dev, priv->tzd);
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dev_err(&pdev->dev, "coefficients of sensor is invalid\n");
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ret = -EINVAL;
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goto disable_clk_all;
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}
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priv->dev = &pdev->dev;
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platform_set_drvdata(pdev, priv);
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return 0;
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disable_clk_all:
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clk_disable_unprepare(priv->clk_apb);
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disable_clk_topcrm:
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clk_disable_unprepare(priv->clk_topcrm);
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return ret;
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}
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static int zx2967_thermal_exit(struct platform_device *pdev)
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{
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struct zx2967_thermal_priv *priv = platform_get_drvdata(pdev);
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thermal_zone_of_sensor_unregister(&pdev->dev, priv->tzd);
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clk_disable_unprepare(priv->clk_topcrm);
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clk_disable_unprepare(priv->clk_apb);
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return 0;
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}
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static const struct of_device_id zx2967_thermal_id_table[] = {
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{ .compatible = "zte,zx296718-thermal" },
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{}
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};
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MODULE_DEVICE_TABLE(of, zx2967_thermal_id_table);
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#ifdef CONFIG_PM_SLEEP
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static int zx2967_thermal_suspend(struct device *dev)
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{
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struct platform_device *pdev = to_platform_device(dev);
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struct zx2967_thermal_priv *priv = platform_get_drvdata(pdev);
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if (priv && priv->clk_topcrm)
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clk_disable_unprepare(priv->clk_topcrm);
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if (priv && priv->clk_apb)
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clk_disable_unprepare(priv->clk_apb);
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return 0;
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}
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static int zx2967_thermal_resume(struct device *dev)
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{
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struct platform_device *pdev = to_platform_device(dev);
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struct zx2967_thermal_priv *priv = platform_get_drvdata(pdev);
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int error;
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error = clk_prepare_enable(priv->clk_topcrm);
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if (error)
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return error;
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error = clk_prepare_enable(priv->clk_apb);
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if (error) {
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clk_disable_unprepare(priv->clk_topcrm);
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return error;
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}
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return 0;
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}
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#endif
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static SIMPLE_DEV_PM_OPS(zx2967_thermal_pm_ops,
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zx2967_thermal_suspend, zx2967_thermal_resume);
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static struct platform_driver zx2967_thermal_driver = {
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.probe = zx2967_thermal_probe,
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.remove = zx2967_thermal_exit,
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.driver = {
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.name = "zx2967_thermal",
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.of_match_table = zx2967_thermal_id_table,
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.pm = &zx2967_thermal_pm_ops,
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},
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};
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module_platform_driver(zx2967_thermal_driver);
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MODULE_AUTHOR("Baoyou Xie <baoyou.xie@linaro.org>");
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MODULE_DESCRIPTION("ZTE zx2967 thermal driver");
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MODULE_LICENSE("GPL v2");
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