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192 lines
4.7 KiB
192 lines
4.7 KiB
// 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 <[email protected]> |
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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->devdata; |
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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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dev_err(&thermal->device, |
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"Temperature sensor reading not valid\n"); |
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return -EIO; |
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} |
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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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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->sensor = devm_ioremap_resource(&pdev->dev, res); |
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if (IS_ERR(priv->sensor)) |
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return PTR_ERR(priv->sensor); |
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res = platform_get_resource(pdev, IORESOURCE_MEM, 1); |
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priv->control = devm_ioremap_resource(&pdev->dev, res); |
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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 <[email protected]>"); |
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MODULE_DESCRIPTION("Dove thermal driver"); |
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MODULE_LICENSE("GPL");
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