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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sr-thermal.c (2764B)

      1// SPDX-License-Identifier: GPL-2.0
      2/*
      3 * Copyright (C) 2018 Broadcom
      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/*
     12 * In stingray thermal IO memory,
     13 * Total Number of available TMONs MASK is at offset 0
     14 * temperature registers BASE is at 4 byte offset.
     15 * Each TMON temperature register size is 4.
     16 */
     17#define SR_TMON_TEMP_BASE(id)   ((id) * 0x4)
     18
     19#define SR_TMON_MAX_LIST        6
     20
     21struct sr_tmon {
     22	struct thermal_zone_device *tz;
     23	unsigned int crit_temp;
     24	unsigned int tmon_id;
     25	struct sr_thermal *priv;
     26};
     27
     28struct sr_thermal {
     29	void __iomem *regs;
     30	unsigned int max_crit_temp;
     31	struct sr_tmon tmon[SR_TMON_MAX_LIST];
     32};
     33
     34static int sr_get_temp(void *data, int *temp)
     35{
     36	struct sr_tmon *tmon = data;
     37	struct sr_thermal *sr_thermal = tmon->priv;
     38
     39	*temp = readl(sr_thermal->regs + SR_TMON_TEMP_BASE(tmon->tmon_id));
     40
     41	return 0;
     42}
     43
     44static const struct thermal_zone_of_device_ops sr_tz_ops = {
     45	.get_temp = sr_get_temp,
     46};
     47
     48static int sr_thermal_probe(struct platform_device *pdev)
     49{
     50	struct device *dev = &pdev->dev;
     51	struct sr_thermal *sr_thermal;
     52	struct sr_tmon *tmon;
     53	struct resource *res;
     54	u32 sr_tmon_list = 0;
     55	unsigned int i;
     56	int ret;
     57
     58	sr_thermal = devm_kzalloc(dev, sizeof(*sr_thermal), GFP_KERNEL);
     59	if (!sr_thermal)
     60		return -ENOMEM;
     61
     62	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
     63	if (!res)
     64		return -ENOENT;
     65
     66	sr_thermal->regs = (void __iomem *)devm_memremap(&pdev->dev, res->start,
     67							 resource_size(res),
     68							 MEMREMAP_WB);
     69	if (IS_ERR(sr_thermal->regs)) {
     70		dev_err(dev, "failed to get io address\n");
     71		return PTR_ERR(sr_thermal->regs);
     72	}
     73
     74	ret = device_property_read_u32(dev, "brcm,tmon-mask", &sr_tmon_list);
     75	if (ret)
     76		return ret;
     77
     78	tmon = sr_thermal->tmon;
     79	for (i = 0; i < SR_TMON_MAX_LIST; i++, tmon++) {
     80		if (!(sr_tmon_list & BIT(i)))
     81			continue;
     82
     83		/* Flush temperature registers */
     84		writel(0, sr_thermal->regs + SR_TMON_TEMP_BASE(i));
     85		tmon->tmon_id = i;
     86		tmon->priv = sr_thermal;
     87		tmon->tz = devm_thermal_zone_of_sensor_register(dev, i, tmon,
     88								&sr_tz_ops);
     89		if (IS_ERR(tmon->tz))
     90			return PTR_ERR(tmon->tz);
     91
     92		dev_dbg(dev, "thermal sensor %d registered\n", i);
     93	}
     94	platform_set_drvdata(pdev, sr_thermal);
     95
     96	return 0;
     97}
     98
     99static const struct of_device_id sr_thermal_of_match[] = {
    100	{ .compatible = "brcm,sr-thermal", },
    101	{},
    102};
    103MODULE_DEVICE_TABLE(of, sr_thermal_of_match);
    104
    105static struct platform_driver sr_thermal_driver = {
    106	.probe		= sr_thermal_probe,
    107	.driver = {
    108		.name = "sr-thermal",
    109		.of_match_table = sr_thermal_of_match,
    110	},
    111};
    112module_platform_driver(sr_thermal_driver);
    113
    114MODULE_AUTHOR("Pramod Kumar <pramod.kumar@broadcom.com>");
    115MODULE_DESCRIPTION("Stingray thermal driver");
    116MODULE_LICENSE("GPL v2");