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250e2110 PK |
1 | // SPDX-License-Identifier: GPL-2.0 |
2 | /* | |
3 | * Copyright (C) 2018 Broadcom | |
4 | */ | |
5 | ||
250e2110 PK |
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 | ||
21 | struct sr_tmon { | |
250e2110 PK |
22 | unsigned int crit_temp; |
23 | unsigned int tmon_id; | |
24 | struct sr_thermal *priv; | |
25 | }; | |
26 | ||
27 | struct sr_thermal { | |
28 | void __iomem *regs; | |
29 | unsigned int max_crit_temp; | |
30 | struct sr_tmon tmon[SR_TMON_MAX_LIST]; | |
31 | }; | |
32 | ||
944441d8 | 33 | static int sr_get_temp(struct thermal_zone_device *tz, int *temp) |
250e2110 | 34 | { |
5f68d078 | 35 | struct sr_tmon *tmon = thermal_zone_device_priv(tz); |
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36 | struct sr_thermal *sr_thermal = tmon->priv; |
37 | ||
38 | *temp = readl(sr_thermal->regs + SR_TMON_TEMP_BASE(tmon->tmon_id)); | |
39 | ||
40 | return 0; | |
41 | } | |
42 | ||
944441d8 | 43 | static const struct thermal_zone_device_ops sr_tz_ops = { |
250e2110 PK |
44 | .get_temp = sr_get_temp, |
45 | }; | |
46 | ||
47 | static int sr_thermal_probe(struct platform_device *pdev) | |
48 | { | |
49 | struct device *dev = &pdev->dev; | |
944441d8 | 50 | struct thermal_zone_device *tz; |
250e2110 PK |
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); | |
e20d136e ZY |
63 | if (!res) |
64 | return -ENOENT; | |
65 | ||
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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; | |
944441d8 DL |
87 | tz = devm_thermal_of_zone_register(dev, i, tmon, |
88 | &sr_tz_ops); | |
89 | if (IS_ERR(tz)) | |
90 | return PTR_ERR(tz); | |
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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 | ||
99 | static const struct of_device_id sr_thermal_of_match[] = { | |
100 | { .compatible = "brcm,sr-thermal", }, | |
101 | {}, | |
102 | }; | |
103 | MODULE_DEVICE_TABLE(of, sr_thermal_of_match); | |
104 | ||
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105 | static 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, | |
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110 | }, |
111 | }; | |
112 | module_platform_driver(sr_thermal_driver); | |
113 | ||
114 | MODULE_AUTHOR("Pramod Kumar <pramod.kumar@broadcom.com>"); | |
115 | MODULE_DESCRIPTION("Stingray thermal driver"); | |
116 | MODULE_LICENSE("GPL v2"); |