107 lines
2.7 KiB
C
107 lines
2.7 KiB
C
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/*
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* Copyright (C) 2017 Rafał Miłecki <rafal@milecki.pl>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/module.h>
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#include <linux/of_address.h>
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#include <linux/platform_device.h>
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#include <linux/thermal.h>
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#define PVTMON_CONTROL0 0x00
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#define PVTMON_CONTROL0_SEL_MASK 0x0000000e
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#define PVTMON_CONTROL0_SEL_TEMP_MONITOR 0x00000000
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#define PVTMON_CONTROL0_SEL_TEST_MODE 0x0000000e
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#define PVTMON_STATUS 0x08
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struct ns_thermal {
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struct thermal_zone_device *tz;
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void __iomem *pvtmon;
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};
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static int ns_thermal_get_temp(void *data, int *temp)
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{
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struct ns_thermal *ns_thermal = data;
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int offset = thermal_zone_get_offset(ns_thermal->tz);
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int slope = thermal_zone_get_slope(ns_thermal->tz);
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u32 val;
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val = readl(ns_thermal->pvtmon + PVTMON_CONTROL0);
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if ((val & PVTMON_CONTROL0_SEL_MASK) != PVTMON_CONTROL0_SEL_TEMP_MONITOR) {
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/* Clear current mode selection */
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val &= ~PVTMON_CONTROL0_SEL_MASK;
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/* Set temp monitor mode (it's the default actually) */
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val |= PVTMON_CONTROL0_SEL_TEMP_MONITOR;
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writel(val, ns_thermal->pvtmon + PVTMON_CONTROL0);
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}
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val = readl(ns_thermal->pvtmon + PVTMON_STATUS);
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*temp = slope * val + offset;
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return 0;
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}
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static const struct thermal_zone_of_device_ops ns_thermal_ops = {
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.get_temp = ns_thermal_get_temp,
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};
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static int ns_thermal_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct ns_thermal *ns_thermal;
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ns_thermal = devm_kzalloc(dev, sizeof(*ns_thermal), GFP_KERNEL);
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if (!ns_thermal)
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return -ENOMEM;
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ns_thermal->pvtmon = of_iomap(dev_of_node(dev), 0);
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if (WARN_ON(!ns_thermal->pvtmon))
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return -ENOENT;
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ns_thermal->tz = devm_thermal_zone_of_sensor_register(dev, 0,
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ns_thermal,
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&ns_thermal_ops);
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if (IS_ERR(ns_thermal->tz)) {
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iounmap(ns_thermal->pvtmon);
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return PTR_ERR(ns_thermal->tz);
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}
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platform_set_drvdata(pdev, ns_thermal);
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return 0;
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}
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static int ns_thermal_remove(struct platform_device *pdev)
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{
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struct ns_thermal *ns_thermal = platform_get_drvdata(pdev);
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iounmap(ns_thermal->pvtmon);
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return 0;
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}
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static const struct of_device_id ns_thermal_of_match[] = {
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{ .compatible = "brcm,ns-thermal", },
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{},
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};
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MODULE_DEVICE_TABLE(of, ns_thermal_of_match);
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static struct platform_driver ns_thermal_driver = {
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.probe = ns_thermal_probe,
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.remove = ns_thermal_remove,
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.driver = {
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.name = "ns-thermal",
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.of_match_table = ns_thermal_of_match,
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},
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};
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module_platform_driver(ns_thermal_driver);
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MODULE_AUTHOR("Rafał Miłecki <rafal@milecki.pl>");
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MODULE_DESCRIPTION("Northstar thermal driver");
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MODULE_LICENSE("GPL v2");
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