9p: disallow RDMA if RDMA CM isn't available
[linux-2.6.git] / drivers / hwmon / k8temp.c
1 /*
2  * k8temp.c - Linux kernel module for hardware monitoring
3  *
4  * Copyright (C) 2006 Rudolf Marek <r.marek@assembler.cz>
5  *
6  * Inspired from the w83785 and amd756 drivers.
7  *
8  * This program is free software; you can redistribute it and/or modify
9  * it under the terms of the GNU General Public License as published by
10  * the Free Software Foundation; either version 2 of the License, or
11  * (at your option) any later version.
12  *
13  * This program is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16  * GNU General Public License for more details.
17  *
18  * You should have received a copy of the GNU General Public License
19  * along with this program; if not, write to the Free Software
20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
21  * 02110-1301 USA.
22  */
23
24 #include <linux/module.h>
25 #include <linux/delay.h>
26 #include <linux/init.h>
27 #include <linux/slab.h>
28 #include <linux/jiffies.h>
29 #include <linux/pci.h>
30 #include <linux/hwmon.h>
31 #include <linux/hwmon-sysfs.h>
32 #include <linux/err.h>
33 #include <linux/mutex.h>
34
35 #define TEMP_FROM_REG(val)      (((((val) >> 16) & 0xff) - 49) * 1000)
36 #define REG_TEMP        0xe4
37 #define SEL_PLACE       0x40
38 #define SEL_CORE        0x04
39
40 struct k8temp_data {
41         struct device *hwmon_dev;
42         struct mutex update_lock;
43         const char *name;
44         char valid;             /* zero until following fields are valid */
45         unsigned long last_updated;     /* in jiffies */
46
47         /* registers values */
48         u8 sensorsp;            /* sensor presence bits - SEL_CORE & SEL_PLACE */
49         u32 temp[2][2];         /* core, place */
50 };
51
52 static struct k8temp_data *k8temp_update_device(struct device *dev)
53 {
54         struct k8temp_data *data = dev_get_drvdata(dev);
55         struct pci_dev *pdev = to_pci_dev(dev);
56         u8 tmp;
57
58         mutex_lock(&data->update_lock);
59
60         if (!data->valid
61             || time_after(jiffies, data->last_updated + HZ)) {
62                 pci_read_config_byte(pdev, REG_TEMP, &tmp);
63                 tmp &= ~(SEL_PLACE | SEL_CORE);         /* Select sensor 0, core0 */
64                 pci_write_config_byte(pdev, REG_TEMP, tmp);
65                 pci_read_config_dword(pdev, REG_TEMP, &data->temp[0][0]);
66
67                 if (data->sensorsp & SEL_PLACE) {
68                         tmp |= SEL_PLACE;       /* Select sensor 1, core0 */
69                         pci_write_config_byte(pdev, REG_TEMP, tmp);
70                         pci_read_config_dword(pdev, REG_TEMP,
71                                               &data->temp[0][1]);
72                 }
73
74                 if (data->sensorsp & SEL_CORE) {
75                         tmp &= ~SEL_PLACE;      /* Select sensor 0, core1 */
76                         tmp |= SEL_CORE;
77                         pci_write_config_byte(pdev, REG_TEMP, tmp);
78                         pci_read_config_dword(pdev, REG_TEMP,
79                                               &data->temp[1][0]);
80
81                         if (data->sensorsp & SEL_PLACE) {
82                                 tmp |= SEL_PLACE;       /* Select sensor 1, core1 */
83                                 pci_write_config_byte(pdev, REG_TEMP, tmp);
84                                 pci_read_config_dword(pdev, REG_TEMP,
85                                                       &data->temp[1][1]);
86                         }
87                 }
88
89                 data->last_updated = jiffies;
90                 data->valid = 1;
91         }
92
93         mutex_unlock(&data->update_lock);
94         return data;
95 }
96
97 /*
98  * Sysfs stuff
99  */
100
101 static ssize_t show_name(struct device *dev, struct device_attribute
102                          *devattr, char *buf)
103 {
104         struct k8temp_data *data = dev_get_drvdata(dev);
105
106         return sprintf(buf, "%s\n", data->name);
107 }
108
109
110 static ssize_t show_temp(struct device *dev,
111                          struct device_attribute *devattr, char *buf)
112 {
113         struct sensor_device_attribute_2 *attr =
114             to_sensor_dev_attr_2(devattr);
115         int core = attr->nr;
116         int place = attr->index;
117         struct k8temp_data *data = k8temp_update_device(dev);
118
119         return sprintf(buf, "%d\n",
120                        TEMP_FROM_REG(data->temp[core][place]));
121 }
122
123 /* core, place */
124
125 static SENSOR_DEVICE_ATTR_2(temp1_input, S_IRUGO, show_temp, NULL, 0, 0);
126 static SENSOR_DEVICE_ATTR_2(temp2_input, S_IRUGO, show_temp, NULL, 0, 1);
127 static SENSOR_DEVICE_ATTR_2(temp3_input, S_IRUGO, show_temp, NULL, 1, 0);
128 static SENSOR_DEVICE_ATTR_2(temp4_input, S_IRUGO, show_temp, NULL, 1, 1);
129 static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
130
131 static struct pci_device_id k8temp_ids[] = {
132         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_K8_NB_MISC) },
133         { 0 },
134 };
135
136 MODULE_DEVICE_TABLE(pci, k8temp_ids);
137
138 static int __devinit k8temp_probe(struct pci_dev *pdev,
139                                   const struct pci_device_id *id)
140 {
141         int err;
142         u8 scfg;
143         u32 temp;
144         struct k8temp_data *data;
145         u32 cpuid = cpuid_eax(1);
146
147         /* this feature should be available since SH-C0 core */
148         if ((cpuid == 0xf40) || (cpuid == 0xf50) || (cpuid == 0xf51)) {
149                 err = -ENODEV;
150                 goto exit;
151         }
152
153         if (!(data = kzalloc(sizeof(struct k8temp_data), GFP_KERNEL))) {
154                 err = -ENOMEM;
155                 goto exit;
156         }
157
158         pci_read_config_byte(pdev, REG_TEMP, &scfg);
159         scfg &= ~(SEL_PLACE | SEL_CORE);                /* Select sensor 0, core0 */
160         pci_write_config_byte(pdev, REG_TEMP, scfg);
161         pci_read_config_byte(pdev, REG_TEMP, &scfg);
162
163         if (scfg & (SEL_PLACE | SEL_CORE)) {
164                 dev_err(&pdev->dev, "Configuration bit(s) stuck at 1!\n");
165                 err = -ENODEV;
166                 goto exit_free;
167         }
168
169         scfg |= (SEL_PLACE | SEL_CORE);
170         pci_write_config_byte(pdev, REG_TEMP, scfg);
171
172         /* now we know if we can change core and/or sensor */
173         pci_read_config_byte(pdev, REG_TEMP, &data->sensorsp);
174
175         if (data->sensorsp & SEL_PLACE) {
176                 scfg &= ~SEL_CORE;      /* Select sensor 1, core0 */
177                 pci_write_config_byte(pdev, REG_TEMP, scfg);
178                 pci_read_config_dword(pdev, REG_TEMP, &temp);
179                 scfg |= SEL_CORE;       /* prepare for next selection */
180                 if (!((temp >> 16) & 0xff))     /* if temp is 0 -49C is not likely */
181                         data->sensorsp &= ~SEL_PLACE;
182         }
183
184         if (data->sensorsp & SEL_CORE) {
185                 scfg &= ~SEL_PLACE;     /* Select sensor 0, core1 */
186                 pci_write_config_byte(pdev, REG_TEMP, scfg);
187                 pci_read_config_dword(pdev, REG_TEMP, &temp);
188                 if (!((temp >> 16) & 0xff))     /* if temp is 0 -49C is not likely */
189                         data->sensorsp &= ~SEL_CORE;
190         }
191
192         data->name = "k8temp";
193         mutex_init(&data->update_lock);
194         dev_set_drvdata(&pdev->dev, data);
195
196         /* Register sysfs hooks */
197         err = device_create_file(&pdev->dev,
198                            &sensor_dev_attr_temp1_input.dev_attr);
199         if (err)
200                 goto exit_remove;
201
202         /* sensor can be changed and reports something */
203         if (data->sensorsp & SEL_PLACE) {
204                 err = device_create_file(&pdev->dev,
205                                    &sensor_dev_attr_temp2_input.dev_attr);
206                 if (err)
207                         goto exit_remove;
208         }
209
210         /* core can be changed and reports something */
211         if (data->sensorsp & SEL_CORE) {
212                 err = device_create_file(&pdev->dev,
213                                    &sensor_dev_attr_temp3_input.dev_attr);
214                 if (err)
215                         goto exit_remove;
216                 if (data->sensorsp & SEL_PLACE)
217                         err = device_create_file(&pdev->dev,
218                                            &sensor_dev_attr_temp4_input.
219                                            dev_attr);
220                         if (err)
221                                 goto exit_remove;
222         }
223
224         err = device_create_file(&pdev->dev, &dev_attr_name);
225         if (err)
226                 goto exit_remove;
227
228         data->hwmon_dev = hwmon_device_register(&pdev->dev);
229
230         if (IS_ERR(data->hwmon_dev)) {
231                 err = PTR_ERR(data->hwmon_dev);
232                 goto exit_remove;
233         }
234
235         return 0;
236
237 exit_remove:
238         device_remove_file(&pdev->dev,
239                            &sensor_dev_attr_temp1_input.dev_attr);
240         device_remove_file(&pdev->dev,
241                            &sensor_dev_attr_temp2_input.dev_attr);
242         device_remove_file(&pdev->dev,
243                            &sensor_dev_attr_temp3_input.dev_attr);
244         device_remove_file(&pdev->dev,
245                            &sensor_dev_attr_temp4_input.dev_attr);
246         device_remove_file(&pdev->dev, &dev_attr_name);
247 exit_free:
248         dev_set_drvdata(&pdev->dev, NULL);
249         kfree(data);
250 exit:
251         return err;
252 }
253
254 static void __devexit k8temp_remove(struct pci_dev *pdev)
255 {
256         struct k8temp_data *data = dev_get_drvdata(&pdev->dev);
257
258         hwmon_device_unregister(data->hwmon_dev);
259         device_remove_file(&pdev->dev,
260                            &sensor_dev_attr_temp1_input.dev_attr);
261         device_remove_file(&pdev->dev,
262                            &sensor_dev_attr_temp2_input.dev_attr);
263         device_remove_file(&pdev->dev,
264                            &sensor_dev_attr_temp3_input.dev_attr);
265         device_remove_file(&pdev->dev,
266                            &sensor_dev_attr_temp4_input.dev_attr);
267         device_remove_file(&pdev->dev, &dev_attr_name);
268         dev_set_drvdata(&pdev->dev, NULL);
269         kfree(data);
270 }
271
272 static struct pci_driver k8temp_driver = {
273         .name = "k8temp",
274         .id_table = k8temp_ids,
275         .probe = k8temp_probe,
276         .remove = __devexit_p(k8temp_remove),
277 };
278
279 static int __init k8temp_init(void)
280 {
281         return pci_register_driver(&k8temp_driver);
282 }
283
284 static void __exit k8temp_exit(void)
285 {
286         pci_unregister_driver(&k8temp_driver);
287 }
288
289 MODULE_AUTHOR("Rudolf Marek <r.marek@assembler.cz>");
290 MODULE_DESCRIPTION("AMD K8 core temperature monitor");
291 MODULE_LICENSE("GPL");
292
293 module_init(k8temp_init)
294 module_exit(k8temp_exit)