net: move procfs code to net/core/net-procfs.c
[linux/fpc-iii.git] / drivers / thermal / spear_thermal.c
blob6b2d8b21aaee03b5a723249cea6773f96c5adf19
1 /*
2 * SPEAr thermal driver.
4 * Copyright (C) 2011-2012 ST Microelectronics
5 * Author: Vincenzo Frascino <vincenzo.frascino@st.com>
7 * This software is licensed under the terms of the GNU General Public
8 * License version 2, as published by the Free Software Foundation, and
9 * may be copied, distributed, and modified under those terms.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
18 #include <linux/clk.h>
19 #include <linux/device.h>
20 #include <linux/err.h>
21 #include <linux/io.h>
22 #include <linux/kernel.h>
23 #include <linux/of.h>
24 #include <linux/module.h>
25 #include <linux/platform_device.h>
26 #include <linux/thermal.h>
28 #define MD_FACTOR 1000
30 /* SPEAr Thermal Sensor Dev Structure */
31 struct spear_thermal_dev {
32 /* pointer to base address of the thermal sensor */
33 void __iomem *thermal_base;
34 /* clk structure */
35 struct clk *clk;
36 /* pointer to thermal flags */
37 unsigned int flags;
40 static inline int thermal_get_temp(struct thermal_zone_device *thermal,
41 unsigned long *temp)
43 struct spear_thermal_dev *stdev = thermal->devdata;
46 * Data are ready to be read after 628 usec from POWERDOWN signal
47 * (PDN) = 1
49 *temp = (readl_relaxed(stdev->thermal_base) & 0x7F) * MD_FACTOR;
50 return 0;
53 static struct thermal_zone_device_ops ops = {
54 .get_temp = thermal_get_temp,
57 #ifdef CONFIG_PM
58 static int spear_thermal_suspend(struct device *dev)
60 struct platform_device *pdev = to_platform_device(dev);
61 struct thermal_zone_device *spear_thermal = platform_get_drvdata(pdev);
62 struct spear_thermal_dev *stdev = spear_thermal->devdata;
63 unsigned int actual_mask = 0;
65 /* Disable SPEAr Thermal Sensor */
66 actual_mask = readl_relaxed(stdev->thermal_base);
67 writel_relaxed(actual_mask & ~stdev->flags, stdev->thermal_base);
69 clk_disable(stdev->clk);
70 dev_info(dev, "Suspended.\n");
72 return 0;
75 static int spear_thermal_resume(struct device *dev)
77 struct platform_device *pdev = to_platform_device(dev);
78 struct thermal_zone_device *spear_thermal = platform_get_drvdata(pdev);
79 struct spear_thermal_dev *stdev = spear_thermal->devdata;
80 unsigned int actual_mask = 0;
81 int ret = 0;
83 ret = clk_enable(stdev->clk);
84 if (ret) {
85 dev_err(&pdev->dev, "Can't enable clock\n");
86 return ret;
89 /* Enable SPEAr Thermal Sensor */
90 actual_mask = readl_relaxed(stdev->thermal_base);
91 writel_relaxed(actual_mask | stdev->flags, stdev->thermal_base);
93 dev_info(dev, "Resumed.\n");
95 return 0;
97 #endif
99 static SIMPLE_DEV_PM_OPS(spear_thermal_pm_ops, spear_thermal_suspend,
100 spear_thermal_resume);
102 static int spear_thermal_probe(struct platform_device *pdev)
104 struct thermal_zone_device *spear_thermal = NULL;
105 struct spear_thermal_dev *stdev;
106 struct device_node *np = pdev->dev.of_node;
107 struct resource *stres = platform_get_resource(pdev, IORESOURCE_MEM, 0);
108 int ret = 0, val;
110 if (!np || !of_property_read_u32(np, "st,thermal-flags", &val)) {
111 dev_err(&pdev->dev, "Failed: DT Pdata not passed\n");
112 return -EINVAL;
115 if (!stres) {
116 dev_err(&pdev->dev, "memory resource missing\n");
117 return -ENODEV;
120 stdev = devm_kzalloc(&pdev->dev, sizeof(*stdev), GFP_KERNEL);
121 if (!stdev) {
122 dev_err(&pdev->dev, "kzalloc fail\n");
123 return -ENOMEM;
126 /* Enable thermal sensor */
127 stdev->thermal_base = devm_ioremap(&pdev->dev, stres->start,
128 resource_size(stres));
129 if (!stdev->thermal_base) {
130 dev_err(&pdev->dev, "ioremap failed\n");
131 return -ENOMEM;
134 stdev->clk = clk_get(&pdev->dev, NULL);
135 if (IS_ERR(stdev->clk)) {
136 dev_err(&pdev->dev, "Can't get clock\n");
137 return PTR_ERR(stdev->clk);
140 ret = clk_enable(stdev->clk);
141 if (ret) {
142 dev_err(&pdev->dev, "Can't enable clock\n");
143 goto put_clk;
146 stdev->flags = val;
147 writel_relaxed(stdev->flags, stdev->thermal_base);
149 spear_thermal = thermal_zone_device_register("spear_thermal", 0, 0,
150 stdev, &ops, NULL, 0, 0);
151 if (IS_ERR(spear_thermal)) {
152 dev_err(&pdev->dev, "thermal zone device is NULL\n");
153 ret = PTR_ERR(spear_thermal);
154 goto disable_clk;
157 platform_set_drvdata(pdev, spear_thermal);
159 dev_info(&spear_thermal->device, "Thermal Sensor Loaded at: 0x%p.\n",
160 stdev->thermal_base);
162 return 0;
164 disable_clk:
165 clk_disable(stdev->clk);
166 put_clk:
167 clk_put(stdev->clk);
169 return ret;
172 static int spear_thermal_exit(struct platform_device *pdev)
174 unsigned int actual_mask = 0;
175 struct thermal_zone_device *spear_thermal = platform_get_drvdata(pdev);
176 struct spear_thermal_dev *stdev = spear_thermal->devdata;
178 thermal_zone_device_unregister(spear_thermal);
179 platform_set_drvdata(pdev, NULL);
181 /* Disable SPEAr Thermal Sensor */
182 actual_mask = readl_relaxed(stdev->thermal_base);
183 writel_relaxed(actual_mask & ~stdev->flags, stdev->thermal_base);
185 clk_disable(stdev->clk);
186 clk_put(stdev->clk);
188 return 0;
191 static const struct of_device_id spear_thermal_id_table[] = {
192 { .compatible = "st,thermal-spear1340" },
195 MODULE_DEVICE_TABLE(of, spear_thermal_id_table);
197 static struct platform_driver spear_thermal_driver = {
198 .probe = spear_thermal_probe,
199 .remove = spear_thermal_exit,
200 .driver = {
201 .name = "spear_thermal",
202 .owner = THIS_MODULE,
203 .pm = &spear_thermal_pm_ops,
204 .of_match_table = of_match_ptr(spear_thermal_id_table),
208 module_platform_driver(spear_thermal_driver);
210 MODULE_AUTHOR("Vincenzo Frascino <vincenzo.frascino@st.com>");
211 MODULE_DESCRIPTION("SPEAr thermal driver");
212 MODULE_LICENSE("GPL");