cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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ns-thermal.c (2597B)


      1// SPDX-License-Identifier: GPL-2.0-only
      2/*
      3 * Copyright (C) 2017 Rafał Miłecki <rafal@milecki.pl>
      4 */
      5
      6#include <linux/module.h>
      7#include <linux/of_address.h>
      8#include <linux/platform_device.h>
      9#include <linux/thermal.h>
     10
     11#define PVTMON_CONTROL0					0x00
     12#define PVTMON_CONTROL0_SEL_MASK			0x0000000e
     13#define PVTMON_CONTROL0_SEL_TEMP_MONITOR		0x00000000
     14#define PVTMON_CONTROL0_SEL_TEST_MODE			0x0000000e
     15#define PVTMON_STATUS					0x08
     16
     17struct ns_thermal {
     18	struct thermal_zone_device *tz;
     19	void __iomem *pvtmon;
     20};
     21
     22static int ns_thermal_get_temp(void *data, int *temp)
     23{
     24	struct ns_thermal *ns_thermal = data;
     25	int offset = thermal_zone_get_offset(ns_thermal->tz);
     26	int slope = thermal_zone_get_slope(ns_thermal->tz);
     27	u32 val;
     28
     29	val = readl(ns_thermal->pvtmon + PVTMON_CONTROL0);
     30	if ((val & PVTMON_CONTROL0_SEL_MASK) != PVTMON_CONTROL0_SEL_TEMP_MONITOR) {
     31		/* Clear current mode selection */
     32		val &= ~PVTMON_CONTROL0_SEL_MASK;
     33
     34		/* Set temp monitor mode (it's the default actually) */
     35		val |= PVTMON_CONTROL0_SEL_TEMP_MONITOR;
     36
     37		writel(val, ns_thermal->pvtmon + PVTMON_CONTROL0);
     38	}
     39
     40	val = readl(ns_thermal->pvtmon + PVTMON_STATUS);
     41	*temp = slope * val + offset;
     42
     43	return 0;
     44}
     45
     46static const struct thermal_zone_of_device_ops ns_thermal_ops = {
     47	.get_temp = ns_thermal_get_temp,
     48};
     49
     50static int ns_thermal_probe(struct platform_device *pdev)
     51{
     52	struct device *dev = &pdev->dev;
     53	struct ns_thermal *ns_thermal;
     54
     55	ns_thermal = devm_kzalloc(dev, sizeof(*ns_thermal), GFP_KERNEL);
     56	if (!ns_thermal)
     57		return -ENOMEM;
     58
     59	ns_thermal->pvtmon = of_iomap(dev_of_node(dev), 0);
     60	if (WARN_ON(!ns_thermal->pvtmon))
     61		return -ENOENT;
     62
     63	ns_thermal->tz = devm_thermal_zone_of_sensor_register(dev, 0,
     64							      ns_thermal,
     65							      &ns_thermal_ops);
     66	if (IS_ERR(ns_thermal->tz)) {
     67		iounmap(ns_thermal->pvtmon);
     68		return PTR_ERR(ns_thermal->tz);
     69	}
     70
     71	platform_set_drvdata(pdev, ns_thermal);
     72
     73	return 0;
     74}
     75
     76static int ns_thermal_remove(struct platform_device *pdev)
     77{
     78	struct ns_thermal *ns_thermal = platform_get_drvdata(pdev);
     79
     80	iounmap(ns_thermal->pvtmon);
     81
     82	return 0;
     83}
     84
     85static const struct of_device_id ns_thermal_of_match[] = {
     86	{ .compatible = "brcm,ns-thermal", },
     87	{},
     88};
     89MODULE_DEVICE_TABLE(of, ns_thermal_of_match);
     90
     91static struct platform_driver ns_thermal_driver = {
     92	.probe		= ns_thermal_probe,
     93	.remove		= ns_thermal_remove,
     94	.driver = {
     95		.name = "ns-thermal",
     96		.of_match_table = ns_thermal_of_match,
     97	},
     98};
     99module_platform_driver(ns_thermal_driver);
    100
    101MODULE_AUTHOR("Rafał Miłecki <rafal@milecki.pl>");
    102MODULE_DESCRIPTION("Northstar thermal driver");
    103MODULE_LICENSE("GPL v2");