tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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
17static int ns_thermal_get_temp(struct thermal_zone_device *tz, int *temp)
18{
19 void __iomem *pvtmon = thermal_zone_device_priv(tz);
20 int offset = thermal_zone_get_offset(tz);
21 int slope = thermal_zone_get_slope(tz);
22 u32 val;
23
24 val = readl(pvtmon + PVTMON_CONTROL0);
25 if ((val & PVTMON_CONTROL0_SEL_MASK) != PVTMON_CONTROL0_SEL_TEMP_MONITOR) {
26 /* Clear current mode selection */
27 val &= ~PVTMON_CONTROL0_SEL_MASK;
28
29 /* Set temp monitor mode (it's the default actually) */
30 val |= PVTMON_CONTROL0_SEL_TEMP_MONITOR;
31
32 writel(val, pvtmon + PVTMON_CONTROL0);
33 }
34
35 val = readl(pvtmon + PVTMON_STATUS);
36 *temp = slope * val + offset;
37
38 return 0;
39}
40
41static const struct thermal_zone_device_ops ns_thermal_ops = {
42 .get_temp = ns_thermal_get_temp,
43};
44
45static int ns_thermal_probe(struct platform_device *pdev)
46{
47 struct device *dev = &pdev->dev;
48 struct thermal_zone_device *tz;
49 void __iomem *pvtmon;
50
51 pvtmon = of_iomap(dev_of_node(dev), 0);
52 if (WARN_ON(!pvtmon))
53 return -ENOENT;
54
55 tz = devm_thermal_of_zone_register(dev, 0,
56 pvtmon,
57 &ns_thermal_ops);
58 if (IS_ERR(tz)) {
59 iounmap(pvtmon);
60 return PTR_ERR(tz);
61 }
62
63 platform_set_drvdata(pdev, pvtmon);
64
65 return 0;
66}
67
68static void ns_thermal_remove(struct platform_device *pdev)
69{
70 void __iomem *pvtmon = platform_get_drvdata(pdev);
71
72 iounmap(pvtmon);
73}
74
75static const struct of_device_id ns_thermal_of_match[] = {
76 { .compatible = "brcm,ns-thermal", },
77 {},
78};
79MODULE_DEVICE_TABLE(of, ns_thermal_of_match);
80
81static struct platform_driver ns_thermal_driver = {
82 .probe = ns_thermal_probe,
83 .remove = ns_thermal_remove,
84 .driver = {
85 .name = "ns-thermal",
86 .of_match_table = ns_thermal_of_match,
87 },
88};
89module_platform_driver(ns_thermal_driver);
90
91MODULE_AUTHOR("Rafał Miłecki <rafal@milecki.pl>");
92MODULE_DESCRIPTION("Northstar thermal driver");
93MODULE_LICENSE("GPL v2");