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");
117