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9c92ab61 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
6a92c366 VF |
2 | /* |
3 | * SPEAr thermal driver. | |
4 | * | |
5 | * Copyright (C) 2011-2012 ST Microelectronics | |
6 | * Author: Vincenzo Frascino <vincenzo.frascino@st.com> | |
6a92c366 VF |
7 | */ |
8 | ||
9 | #include <linux/clk.h> | |
10 | #include <linux/device.h> | |
11 | #include <linux/err.h> | |
12 | #include <linux/io.h> | |
13 | #include <linux/kernel.h> | |
b9c7aff4 | 14 | #include <linux/of.h> |
6a92c366 VF |
15 | #include <linux/module.h> |
16 | #include <linux/platform_device.h> | |
6a92c366 VF |
17 | #include <linux/thermal.h> |
18 | ||
19 | #define MD_FACTOR 1000 | |
20 | ||
21 | /* SPEAr Thermal Sensor Dev Structure */ | |
22 | struct spear_thermal_dev { | |
23 | /* pointer to base address of the thermal sensor */ | |
24 | void __iomem *thermal_base; | |
25 | /* clk structure */ | |
26 | struct clk *clk; | |
27 | /* pointer to thermal flags */ | |
28 | unsigned int flags; | |
29 | }; | |
30 | ||
31 | static inline int thermal_get_temp(struct thermal_zone_device *thermal, | |
17e8351a | 32 | int *temp) |
6a92c366 VF |
33 | { |
34 | struct spear_thermal_dev *stdev = thermal->devdata; | |
35 | ||
36 | /* | |
37 | * Data are ready to be read after 628 usec from POWERDOWN signal | |
38 | * (PDN) = 1 | |
39 | */ | |
de716e32 | 40 | *temp = (readl_relaxed(stdev->thermal_base) & 0x7F) * MD_FACTOR; |
6a92c366 VF |
41 | return 0; |
42 | } | |
43 | ||
44 | static struct thermal_zone_device_ops ops = { | |
45 | .get_temp = thermal_get_temp, | |
46 | }; | |
47 | ||
d612c64d | 48 | static int __maybe_unused spear_thermal_suspend(struct device *dev) |
6a92c366 | 49 | { |
3fc62efe | 50 | struct thermal_zone_device *spear_thermal = dev_get_drvdata(dev); |
6a92c366 VF |
51 | struct spear_thermal_dev *stdev = spear_thermal->devdata; |
52 | unsigned int actual_mask = 0; | |
53 | ||
54 | /* Disable SPEAr Thermal Sensor */ | |
de716e32 VK |
55 | actual_mask = readl_relaxed(stdev->thermal_base); |
56 | writel_relaxed(actual_mask & ~stdev->flags, stdev->thermal_base); | |
6a92c366 VF |
57 | |
58 | clk_disable(stdev->clk); | |
59 | dev_info(dev, "Suspended.\n"); | |
60 | ||
61 | return 0; | |
62 | } | |
63 | ||
d612c64d | 64 | static int __maybe_unused spear_thermal_resume(struct device *dev) |
6a92c366 | 65 | { |
3fc62efe | 66 | struct thermal_zone_device *spear_thermal = dev_get_drvdata(dev); |
6a92c366 VF |
67 | struct spear_thermal_dev *stdev = spear_thermal->devdata; |
68 | unsigned int actual_mask = 0; | |
69 | int ret = 0; | |
70 | ||
71 | ret = clk_enable(stdev->clk); | |
72 | if (ret) { | |
3fc62efe | 73 | dev_err(dev, "Can't enable clock\n"); |
6a92c366 VF |
74 | return ret; |
75 | } | |
76 | ||
77 | /* Enable SPEAr Thermal Sensor */ | |
de716e32 VK |
78 | actual_mask = readl_relaxed(stdev->thermal_base); |
79 | writel_relaxed(actual_mask | stdev->flags, stdev->thermal_base); | |
6a92c366 VF |
80 | |
81 | dev_info(dev, "Resumed.\n"); | |
82 | ||
83 | return 0; | |
84 | } | |
6a92c366 VF |
85 | |
86 | static SIMPLE_DEV_PM_OPS(spear_thermal_pm_ops, spear_thermal_suspend, | |
87 | spear_thermal_resume); | |
88 | ||
89 | static int spear_thermal_probe(struct platform_device *pdev) | |
90 | { | |
91 | struct thermal_zone_device *spear_thermal = NULL; | |
92 | struct spear_thermal_dev *stdev; | |
b9c7aff4 | 93 | struct device_node *np = pdev->dev.of_node; |
253e3ae1 | 94 | struct resource *res; |
b9c7aff4 VK |
95 | int ret = 0, val; |
96 | ||
97 | if (!np || !of_property_read_u32(np, "st,thermal-flags", &val)) { | |
98 | dev_err(&pdev->dev, "Failed: DT Pdata not passed\n"); | |
99 | return -EINVAL; | |
100 | } | |
6a92c366 | 101 | |
6a92c366 | 102 | stdev = devm_kzalloc(&pdev->dev, sizeof(*stdev), GFP_KERNEL); |
fa018d3e | 103 | if (!stdev) |
6a92c366 | 104 | return -ENOMEM; |
6a92c366 VF |
105 | |
106 | /* Enable thermal sensor */ | |
c21bec86 ZR |
107 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
108 | stdev->thermal_base = devm_ioremap_resource(&pdev->dev, res); | |
109 | if (IS_ERR(stdev->thermal_base)) | |
253e3ae1 | 110 | return PTR_ERR(stdev->thermal_base); |
6a92c366 | 111 | |
03b79bda | 112 | stdev->clk = devm_clk_get(&pdev->dev, NULL); |
6a92c366 VF |
113 | if (IS_ERR(stdev->clk)) { |
114 | dev_err(&pdev->dev, "Can't get clock\n"); | |
115 | return PTR_ERR(stdev->clk); | |
116 | } | |
117 | ||
118 | ret = clk_enable(stdev->clk); | |
119 | if (ret) { | |
120 | dev_err(&pdev->dev, "Can't enable clock\n"); | |
03b79bda | 121 | return ret; |
6a92c366 VF |
122 | } |
123 | ||
b9c7aff4 | 124 | stdev->flags = val; |
de716e32 | 125 | writel_relaxed(stdev->flags, stdev->thermal_base); |
6a92c366 | 126 | |
c56f5c03 | 127 | spear_thermal = thermal_zone_device_register("spear_thermal", 0, 0, |
50125a9b | 128 | stdev, &ops, NULL, 0, 0); |
03ee62f0 | 129 | if (IS_ERR(spear_thermal)) { |
6a92c366 | 130 | dev_err(&pdev->dev, "thermal zone device is NULL\n"); |
03ee62f0 | 131 | ret = PTR_ERR(spear_thermal); |
6a92c366 VF |
132 | goto disable_clk; |
133 | } | |
bbcf90c0 AP |
134 | ret = thermal_zone_device_enable(spear_thermal); |
135 | if (ret) { | |
136 | dev_err(&pdev->dev, "Cannot enable thermal zone\n"); | |
137 | goto unregister_tzd; | |
138 | } | |
6a92c366 VF |
139 | |
140 | platform_set_drvdata(pdev, spear_thermal); | |
141 | ||
142 | dev_info(&spear_thermal->device, "Thermal Sensor Loaded at: 0x%p.\n", | |
143 | stdev->thermal_base); | |
144 | ||
145 | return 0; | |
146 | ||
bbcf90c0 AP |
147 | unregister_tzd: |
148 | thermal_zone_device_unregister(spear_thermal); | |
6a92c366 VF |
149 | disable_clk: |
150 | clk_disable(stdev->clk); | |
6a92c366 VF |
151 | |
152 | return ret; | |
153 | } | |
154 | ||
155 | static int spear_thermal_exit(struct platform_device *pdev) | |
156 | { | |
157 | unsigned int actual_mask = 0; | |
158 | struct thermal_zone_device *spear_thermal = platform_get_drvdata(pdev); | |
159 | struct spear_thermal_dev *stdev = spear_thermal->devdata; | |
160 | ||
161 | thermal_zone_device_unregister(spear_thermal); | |
6a92c366 VF |
162 | |
163 | /* Disable SPEAr Thermal Sensor */ | |
de716e32 VK |
164 | actual_mask = readl_relaxed(stdev->thermal_base); |
165 | writel_relaxed(actual_mask & ~stdev->flags, stdev->thermal_base); | |
6a92c366 VF |
166 | |
167 | clk_disable(stdev->clk); | |
6a92c366 VF |
168 | |
169 | return 0; | |
170 | } | |
171 | ||
b9c7aff4 VK |
172 | static const struct of_device_id spear_thermal_id_table[] = { |
173 | { .compatible = "st,thermal-spear1340" }, | |
174 | {} | |
175 | }; | |
176 | MODULE_DEVICE_TABLE(of, spear_thermal_id_table); | |
177 | ||
6a92c366 VF |
178 | static struct platform_driver spear_thermal_driver = { |
179 | .probe = spear_thermal_probe, | |
180 | .remove = spear_thermal_exit, | |
181 | .driver = { | |
182 | .name = "spear_thermal", | |
6a92c366 | 183 | .pm = &spear_thermal_pm_ops, |
5454f211 | 184 | .of_match_table = spear_thermal_id_table, |
6a92c366 VF |
185 | }, |
186 | }; | |
187 | ||
188 | module_platform_driver(spear_thermal_driver); | |
189 | ||
190 | MODULE_AUTHOR("Vincenzo Frascino <vincenzo.frascino@st.com>"); | |
191 | MODULE_DESCRIPTION("SPEAr thermal driver"); | |
192 | MODULE_LICENSE("GPL"); |