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256 lines
6.2 KiB
256 lines
6.2 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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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 <[email protected]> |
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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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* @dev: struct device pointer |
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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 const 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 zx2967_thermal_priv *priv = dev_get_drvdata(dev); |
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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 zx2967_thermal_priv *priv = dev_get_drvdata(dev); |
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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 <[email protected]>"); |
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MODULE_DESCRIPTION("ZTE zx2967 thermal driver"); |
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MODULE_LICENSE("GPL v2");
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