187 строки
4.6 KiB
C
187 строки
4.6 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Dove thermal sensor driver
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*
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* Copyright (C) 2013 Andrew Lunn <andrew@lunn.ch>
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*/
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#include <linux/device.h>
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#include <linux/err.h>
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#include <linux/io.h>
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#include <linux/kernel.h>
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#include <linux/of.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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#define DOVE_THERMAL_TEMP_OFFSET 1
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#define DOVE_THERMAL_TEMP_MASK 0x1FF
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/* Dove Thermal Manager Control and Status Register */
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#define PMU_TM_DISABLE_OFFS 0
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#define PMU_TM_DISABLE_MASK (0x1 << PMU_TM_DISABLE_OFFS)
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/* Dove Theraml Diode Control 0 Register */
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#define PMU_TDC0_SW_RST_MASK (0x1 << 1)
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#define PMU_TDC0_SEL_VCAL_OFFS 5
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#define PMU_TDC0_SEL_VCAL_MASK (0x3 << PMU_TDC0_SEL_VCAL_OFFS)
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#define PMU_TDC0_REF_CAL_CNT_OFFS 11
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#define PMU_TDC0_REF_CAL_CNT_MASK (0x1FF << PMU_TDC0_REF_CAL_CNT_OFFS)
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#define PMU_TDC0_AVG_NUM_OFFS 25
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#define PMU_TDC0_AVG_NUM_MASK (0x7 << PMU_TDC0_AVG_NUM_OFFS)
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/* Dove Thermal Diode Control 1 Register */
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#define PMU_TEMP_DIOD_CTRL1_REG 0x04
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#define PMU_TDC1_TEMP_VALID_MASK (0x1 << 10)
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/* Dove Thermal Sensor Dev Structure */
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struct dove_thermal_priv {
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void __iomem *sensor;
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void __iomem *control;
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};
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static int dove_init_sensor(const struct dove_thermal_priv *priv)
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{
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u32 reg;
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u32 i;
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/* Configure the Diode Control Register #0 */
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reg = readl_relaxed(priv->control);
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/* Use average of 2 */
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reg &= ~PMU_TDC0_AVG_NUM_MASK;
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reg |= (0x1 << PMU_TDC0_AVG_NUM_OFFS);
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/* Reference calibration value */
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reg &= ~PMU_TDC0_REF_CAL_CNT_MASK;
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reg |= (0x0F1 << PMU_TDC0_REF_CAL_CNT_OFFS);
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/* Set the high level reference for calibration */
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reg &= ~PMU_TDC0_SEL_VCAL_MASK;
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reg |= (0x2 << PMU_TDC0_SEL_VCAL_OFFS);
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writel(reg, priv->control);
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/* Reset the sensor */
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reg = readl_relaxed(priv->control);
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writel((reg | PMU_TDC0_SW_RST_MASK), priv->control);
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writel(reg, priv->control);
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/* Enable the sensor */
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reg = readl_relaxed(priv->sensor);
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reg &= ~PMU_TM_DISABLE_MASK;
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writel(reg, priv->sensor);
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/* Poll the sensor for the first reading */
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for (i = 0; i < 1000000; i++) {
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reg = readl_relaxed(priv->sensor);
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if (reg & DOVE_THERMAL_TEMP_MASK)
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break;
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}
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if (i == 1000000)
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return -EIO;
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return 0;
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}
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static int dove_get_temp(struct thermal_zone_device *thermal,
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int *temp)
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{
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unsigned long reg;
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struct dove_thermal_priv *priv = thermal_zone_device_priv(thermal);
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/* Valid check */
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reg = readl_relaxed(priv->control + PMU_TEMP_DIOD_CTRL1_REG);
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if ((reg & PMU_TDC1_TEMP_VALID_MASK) == 0x0)
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return -EIO;
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/*
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* Calculate temperature. According to Marvell internal
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* documentation the formula for this is:
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* Celsius = (322-reg)/1.3625
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*/
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reg = readl_relaxed(priv->sensor);
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reg = (reg >> DOVE_THERMAL_TEMP_OFFSET) & DOVE_THERMAL_TEMP_MASK;
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*temp = ((3220000000UL - (10000000UL * reg)) / 13625);
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return 0;
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}
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static struct thermal_zone_device_ops ops = {
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.get_temp = dove_get_temp,
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};
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static const struct of_device_id dove_thermal_id_table[] = {
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{ .compatible = "marvell,dove-thermal" },
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{}
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};
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static int dove_thermal_probe(struct platform_device *pdev)
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{
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struct thermal_zone_device *thermal = NULL;
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struct dove_thermal_priv *priv;
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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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priv->sensor = devm_platform_get_and_ioremap_resource(pdev, 0, NULL);
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if (IS_ERR(priv->sensor))
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return PTR_ERR(priv->sensor);
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priv->control = devm_platform_get_and_ioremap_resource(pdev, 1, NULL);
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if (IS_ERR(priv->control))
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return PTR_ERR(priv->control);
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ret = dove_init_sensor(priv);
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if (ret) {
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dev_err(&pdev->dev, "Failed to initialize sensor\n");
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return ret;
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}
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thermal = thermal_zone_device_register("dove_thermal", 0, 0,
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priv, &ops, NULL, 0, 0);
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if (IS_ERR(thermal)) {
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dev_err(&pdev->dev,
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"Failed to register thermal zone device\n");
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return PTR_ERR(thermal);
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}
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ret = thermal_zone_device_enable(thermal);
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if (ret) {
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thermal_zone_device_unregister(thermal);
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return ret;
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}
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platform_set_drvdata(pdev, thermal);
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return 0;
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}
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static int dove_thermal_exit(struct platform_device *pdev)
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{
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struct thermal_zone_device *dove_thermal =
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platform_get_drvdata(pdev);
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thermal_zone_device_unregister(dove_thermal);
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return 0;
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}
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MODULE_DEVICE_TABLE(of, dove_thermal_id_table);
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static struct platform_driver dove_thermal_driver = {
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.probe = dove_thermal_probe,
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.remove = dove_thermal_exit,
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.driver = {
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.name = "dove_thermal",
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.of_match_table = dove_thermal_id_table,
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},
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};
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module_platform_driver(dove_thermal_driver);
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MODULE_AUTHOR("Andrew Lunn <andrew@lunn.ch>");
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MODULE_DESCRIPTION("Dove thermal driver");
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MODULE_LICENSE("GPL");
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