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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thermal_mmio.c (2815B)

      1// SPDX-License-Identifier: GPL-2.0
      2/*
      3 * Copyright 2019 Amazon.com, Inc. or its affiliates. All Rights Reserved.
      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
     11struct thermal_mmio {
     12	void __iomem *mmio_base;
     13	u32 (*read_mmio)(void __iomem *mmio_base);
     14	u32 mask;
     15	int factor;
     16};
     17
     18static u32 thermal_mmio_readb(void __iomem *mmio_base)
     19{
     20	return readb(mmio_base);
     21}
     22
     23static int thermal_mmio_get_temperature(void *private, int *temp)
     24{
     25	int t;
     26	struct thermal_mmio *sensor =
     27		(struct thermal_mmio *)private;
     28
     29	t = sensor->read_mmio(sensor->mmio_base) & sensor->mask;
     30	t *= sensor->factor;
     31
     32	*temp = t;
     33
     34	return 0;
     35}
     36
     37static const struct thermal_zone_of_device_ops thermal_mmio_ops = {
     38	.get_temp = thermal_mmio_get_temperature,
     39};
     40
     41static int thermal_mmio_probe(struct platform_device *pdev)
     42{
     43	struct resource *resource;
     44	struct thermal_mmio *sensor;
     45	int (*sensor_init_func)(struct platform_device *pdev,
     46				struct thermal_mmio *sensor);
     47	struct thermal_zone_device *thermal_zone;
     48	int ret;
     49	int temperature;
     50
     51	sensor = devm_kzalloc(&pdev->dev, sizeof(*sensor), GFP_KERNEL);
     52	if (!sensor)
     53		return -ENOMEM;
     54
     55	resource = platform_get_resource(pdev, IORESOURCE_MEM, 0);
     56	sensor->mmio_base = devm_ioremap_resource(&pdev->dev, resource);
     57	if (IS_ERR(sensor->mmio_base))
     58		return PTR_ERR(sensor->mmio_base);
     59
     60	sensor_init_func = device_get_match_data(&pdev->dev);
     61	if (sensor_init_func) {
     62		ret = sensor_init_func(pdev, sensor);
     63		if (ret) {
     64			dev_err(&pdev->dev,
     65				"failed to initialize sensor (%d)\n",
     66				ret);
     67			return ret;
     68		}
     69	}
     70
     71	thermal_zone = devm_thermal_zone_of_sensor_register(&pdev->dev,
     72							    0,
     73							    sensor,
     74							    &thermal_mmio_ops);
     75	if (IS_ERR(thermal_zone)) {
     76		dev_err(&pdev->dev,
     77			"failed to register sensor (%ld)\n",
     78			PTR_ERR(thermal_zone));
     79		return PTR_ERR(thermal_zone);
     80	}
     81
     82	thermal_mmio_get_temperature(sensor, &temperature);
     83	dev_info(&pdev->dev,
     84		 "thermal mmio sensor %s registered, current temperature: %d\n",
     85		 pdev->name, temperature);
     86
     87	return 0;
     88}
     89
     90static int al_thermal_init(struct platform_device *pdev,
     91			   struct thermal_mmio *sensor)
     92{
     93	sensor->read_mmio = thermal_mmio_readb;
     94	sensor->mask = 0xff;
     95	sensor->factor = 1000;
     96
     97	return 0;
     98}
     99
    100static const struct of_device_id thermal_mmio_id_table[] = {
    101	{ .compatible = "amazon,al-thermal", .data = al_thermal_init},
    102	{}
    103};
    104MODULE_DEVICE_TABLE(of, thermal_mmio_id_table);
    105
    106static struct platform_driver thermal_mmio_driver = {
    107	.probe = thermal_mmio_probe,
    108	.driver = {
    109		.name = "thermal-mmio",
    110		.of_match_table = of_match_ptr(thermal_mmio_id_table),
    111	},
    112};
    113
    114module_platform_driver(thermal_mmio_driver);
    115
    116MODULE_AUTHOR("Talel Shenhar <talel@amazon.com>");
    117MODULE_DESCRIPTION("Thermal MMIO Driver");
    118MODULE_LICENSE("GPL v2");