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authorDarrick J. Wong <djwong@us.ibm.com>2007-10-18 16:22:43 -0400
committerMark M. Hoffman <mhoffman@lightlink.com>2007-11-08 08:42:46 -0500
commit298c752491f5bd8f6b04dd7fc40b53da4e86e093 (patch)
treebe1be251adca01b0d3f0de3b82a6622a7cef70d5 /drivers/hwmon/i5k_amb.c
parent19e4f3a616ce1753a21b1125fd1923ea6273cd0d (diff)
hwmon: (i5k_amb) New memory temperature sensor driver
New driver to read FB-DIMM temperature sensors on systems with the Intel 5000 series chipsets. Signed-off-by: Darrick J. Wong <djwong@us.ibm.com> Signed-off-by: Mark M. Hoffman <mhoffman@lightlink.com>
Diffstat (limited to 'drivers/hwmon/i5k_amb.c')
-rw-r--r--drivers/hwmon/i5k_amb.c531
1 files changed, 531 insertions, 0 deletions
diff --git a/drivers/hwmon/i5k_amb.c b/drivers/hwmon/i5k_amb.c
new file mode 100644
index 000000000000..7fdbe810e8e2
--- /dev/null
+++ b/drivers/hwmon/i5k_amb.c
@@ -0,0 +1,531 @@
1/*
2 * A hwmon driver for the Intel 5000 series chipset FB-DIMM AMB
3 * temperature sensors
4 * Copyright (C) 2007 IBM
5 *
6 * Author: Darrick J. Wong <djwong@us.ibm.com>
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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21 */
22
23#include <linux/module.h>
24#include <linux/jiffies.h>
25#include <linux/hwmon.h>
26#include <linux/hwmon-sysfs.h>
27#include <linux/err.h>
28#include <linux/mutex.h>
29#include <linux/delay.h>
30#include <linux/log2.h>
31#include <linux/pci.h>
32#include <linux/platform_device.h>
33
34#define DRVNAME "i5k_amb"
35
36#define I5K_REG_AMB_BASE_ADDR 0x48
37#define I5K_REG_AMB_LEN_ADDR 0x50
38#define I5K_REG_CHAN0_PRESENCE_ADDR 0x64
39#define I5K_REG_CHAN1_PRESENCE_ADDR 0x66
40
41#define AMB_REG_TEMP_MIN_ADDR 0x80
42#define AMB_REG_TEMP_MID_ADDR 0x81
43#define AMB_REG_TEMP_MAX_ADDR 0x82
44#define AMB_REG_TEMP_STATUS_ADDR 0x84
45#define AMB_REG_TEMP_ADDR 0x85
46
47#define AMB_CONFIG_SIZE 2048
48#define AMB_FUNC_3_OFFSET 768
49
50#define AMB_REG_TEMP_STATUS(amb) ((amb) * AMB_CONFIG_SIZE + \
51 AMB_FUNC_3_OFFSET + AMB_REG_TEMP_STATUS_ADDR)
52#define AMB_REG_TEMP_MIN(amb) ((amb) * AMB_CONFIG_SIZE + \
53 AMB_FUNC_3_OFFSET + AMB_REG_TEMP_MIN_ADDR)
54#define AMB_REG_TEMP_MID(amb) ((amb) * AMB_CONFIG_SIZE + \
55 AMB_FUNC_3_OFFSET + AMB_REG_TEMP_MID_ADDR)
56#define AMB_REG_TEMP_MAX(amb) ((amb) * AMB_CONFIG_SIZE + \
57 AMB_FUNC_3_OFFSET + AMB_REG_TEMP_MAX_ADDR)
58#define AMB_REG_TEMP(amb) ((amb) * AMB_CONFIG_SIZE + \
59 AMB_FUNC_3_OFFSET + AMB_REG_TEMP_ADDR)
60
61#define MAX_MEM_CHANNELS 4
62#define MAX_AMBS_PER_CHANNEL 16
63#define MAX_AMBS (MAX_MEM_CHANNELS * \
64 MAX_AMBS_PER_CHANNEL)
65/*
66 * Ugly hack: For some reason the highest bit is set if there
67 * are _any_ DIMMs in the channel. Attempting to read from
68 * this "high-order" AMB results in a memory bus error, so
69 * for now we'll just ignore that top bit, even though that
70 * might prevent us from seeing the 16th DIMM in the channel.
71 */
72#define REAL_MAX_AMBS_PER_CHANNEL 15
73#define KNOBS_PER_AMB 5
74
75#define AMB_NUM_FROM_REG(byte_num, bit_num) ((byte_num) * \
76 MAX_AMBS_PER_CHANNEL) + (bit_num)
77
78#define AMB_SYSFS_NAME_LEN 16
79struct i5k_device_attribute {
80 struct sensor_device_attribute s_attr;
81 char name[AMB_SYSFS_NAME_LEN];
82};
83
84struct i5k_amb_data {
85 struct device *hwmon_dev;
86
87 unsigned long amb_base;
88 unsigned long amb_len;
89 u16 amb_present[MAX_MEM_CHANNELS];
90 void __iomem *amb_mmio;
91 struct i5k_device_attribute *attrs;
92 unsigned int num_attrs;
93};
94
95static ssize_t show_name(struct device *dev, struct device_attribute *devattr,
96 char *buf)
97{
98 return sprintf(buf, "%s\n", DRVNAME);
99}
100
101
102static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
103
104static struct platform_device *amb_pdev;
105
106static u8 amb_read_byte(struct i5k_amb_data *data, unsigned long offset)
107{
108 return ioread8(data->amb_mmio + offset);
109}
110
111static void amb_write_byte(struct i5k_amb_data *data, unsigned long offset,
112 u8 val)
113{
114 iowrite8(val, data->amb_mmio + offset);
115}
116
117static ssize_t show_amb_alarm(struct device *dev,
118 struct device_attribute *devattr,
119 char *buf)
120{
121 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
122 struct i5k_amb_data *data = dev_get_drvdata(dev);
123
124 if (!(amb_read_byte(data, AMB_REG_TEMP_STATUS(attr->index)) & 0x20) &&
125 (amb_read_byte(data, AMB_REG_TEMP_STATUS(attr->index)) & 0x8))
126 return sprintf(buf, "1\n");
127 else
128 return sprintf(buf, "0\n");
129}
130
131static ssize_t store_amb_min(struct device *dev,
132 struct device_attribute *devattr,
133 const char *buf,
134 size_t count)
135{
136 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
137 struct i5k_amb_data *data = dev_get_drvdata(dev);
138 unsigned long temp = simple_strtoul(buf, NULL, 10) / 500;
139
140 if (temp > 255)
141 temp = 255;
142
143 amb_write_byte(data, AMB_REG_TEMP_MIN(attr->index), temp);
144 return count;
145}
146
147static ssize_t store_amb_mid(struct device *dev,
148 struct device_attribute *devattr,
149 const char *buf,
150 size_t count)
151{
152 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
153 struct i5k_amb_data *data = dev_get_drvdata(dev);
154 unsigned long temp = simple_strtoul(buf, NULL, 10) / 500;
155
156 if (temp > 255)
157 temp = 255;
158
159 amb_write_byte(data, AMB_REG_TEMP_MID(attr->index), temp);
160 return count;
161}
162
163static ssize_t store_amb_max(struct device *dev,
164 struct device_attribute *devattr,
165 const char *buf,
166 size_t count)
167{
168 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
169 struct i5k_amb_data *data = dev_get_drvdata(dev);
170 unsigned long temp = simple_strtoul(buf, NULL, 10) / 500;
171
172 if (temp > 255)
173 temp = 255;
174
175 amb_write_byte(data, AMB_REG_TEMP_MAX(attr->index), temp);
176 return count;
177}
178
179static ssize_t show_amb_min(struct device *dev,
180 struct device_attribute *devattr,
181 char *buf)
182{
183 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
184 struct i5k_amb_data *data = dev_get_drvdata(dev);
185 return sprintf(buf, "%d\n",
186 500 * amb_read_byte(data, AMB_REG_TEMP_MIN(attr->index)));
187}
188
189static ssize_t show_amb_mid(struct device *dev,
190 struct device_attribute *devattr,
191 char *buf)
192{
193 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
194 struct i5k_amb_data *data = dev_get_drvdata(dev);
195 return sprintf(buf, "%d\n",
196 500 * amb_read_byte(data, AMB_REG_TEMP_MID(attr->index)));
197}
198
199static ssize_t show_amb_max(struct device *dev,
200 struct device_attribute *devattr,
201 char *buf)
202{
203 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
204 struct i5k_amb_data *data = dev_get_drvdata(dev);
205 return sprintf(buf, "%d\n",
206 500 * amb_read_byte(data, AMB_REG_TEMP_MAX(attr->index)));
207}
208
209static ssize_t show_amb_temp(struct device *dev,
210 struct device_attribute *devattr,
211 char *buf)
212{
213 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
214 struct i5k_amb_data *data = dev_get_drvdata(dev);
215 return sprintf(buf, "%d\n",
216 500 * amb_read_byte(data, AMB_REG_TEMP(attr->index)));
217}
218
219static int __devinit i5k_amb_hwmon_init(struct platform_device *pdev)
220{
221 int i, j, k, d = 0;
222 u16 c;
223 int res = 0;
224 int num_ambs = 0;
225 struct i5k_amb_data *data = platform_get_drvdata(pdev);
226
227 /* Count the number of AMBs found */
228 /* ignore the high-order bit, see "Ugly hack" comment above */
229 for (i = 0; i < MAX_MEM_CHANNELS; i++)
230 num_ambs += hweight16(data->amb_present[i] & 0x7fff);
231
232 /* Set up sysfs stuff */
233 data->attrs = kzalloc(sizeof(*data->attrs) * num_ambs * KNOBS_PER_AMB,
234 GFP_KERNEL);
235 if (!data->attrs)
236 return -ENOMEM;
237 data->num_attrs = 0;
238
239 for (i = 0; i < MAX_MEM_CHANNELS; i++) {
240 c = data->amb_present[i];
241 for (j = 0; j < REAL_MAX_AMBS_PER_CHANNEL; j++, c >>= 1) {
242 struct i5k_device_attribute *iattr;
243
244 k = AMB_NUM_FROM_REG(i, j);
245 if (!(c & 0x1))
246 continue;
247 d++;
248
249 /* Temperature sysfs knob */
250 iattr = data->attrs + data->num_attrs;
251 snprintf(iattr->name, AMB_SYSFS_NAME_LEN,
252 "temp%d_input", d);
253 iattr->s_attr.dev_attr.attr.name = iattr->name;
254 iattr->s_attr.dev_attr.attr.mode = S_IRUGO;
255 iattr->s_attr.dev_attr.show = show_amb_temp;
256 iattr->s_attr.index = k;
257 res = device_create_file(&pdev->dev,
258 &iattr->s_attr.dev_attr);
259 if (res)
260 goto exit_remove;
261 data->num_attrs++;
262
263 /* Temperature min sysfs knob */
264 iattr = data->attrs + data->num_attrs;
265 snprintf(iattr->name, AMB_SYSFS_NAME_LEN,
266 "temp%d_min", d);
267 iattr->s_attr.dev_attr.attr.name = iattr->name;
268 iattr->s_attr.dev_attr.attr.mode = S_IWUSR | S_IRUGO;
269 iattr->s_attr.dev_attr.show = show_amb_min;
270 iattr->s_attr.dev_attr.store = store_amb_min;
271 iattr->s_attr.index = k;
272 res = device_create_file(&pdev->dev,
273 &iattr->s_attr.dev_attr);
274 if (res)
275 goto exit_remove;
276 data->num_attrs++;
277
278 /* Temperature mid sysfs knob */
279 iattr = data->attrs + data->num_attrs;
280 snprintf(iattr->name, AMB_SYSFS_NAME_LEN,
281 "temp%d_mid", d);
282 iattr->s_attr.dev_attr.attr.name = iattr->name;
283 iattr->s_attr.dev_attr.attr.mode = S_IWUSR | S_IRUGO;
284 iattr->s_attr.dev_attr.show = show_amb_mid;
285 iattr->s_attr.dev_attr.store = store_amb_mid;
286 iattr->s_attr.index = k;
287 res = device_create_file(&pdev->dev,
288 &iattr->s_attr.dev_attr);
289 if (res)
290 goto exit_remove;
291 data->num_attrs++;
292
293 /* Temperature max sysfs knob */
294 iattr = data->attrs + data->num_attrs;
295 snprintf(iattr->name, AMB_SYSFS_NAME_LEN,
296 "temp%d_max", d);
297 iattr->s_attr.dev_attr.attr.name = iattr->name;
298 iattr->s_attr.dev_attr.attr.mode = S_IWUSR | S_IRUGO;
299 iattr->s_attr.dev_attr.show = show_amb_max;
300 iattr->s_attr.dev_attr.store = store_amb_max;
301 iattr->s_attr.index = k;
302 res = device_create_file(&pdev->dev,
303 &iattr->s_attr.dev_attr);
304 if (res)
305 goto exit_remove;
306 data->num_attrs++;
307
308 /* Temperature alarm sysfs knob */
309 iattr = data->attrs + data->num_attrs;
310 snprintf(iattr->name, AMB_SYSFS_NAME_LEN,
311 "temp%d_alarm", d);
312 iattr->s_attr.dev_attr.attr.name = iattr->name;
313 iattr->s_attr.dev_attr.attr.mode = S_IRUGO;
314 iattr->s_attr.dev_attr.show = show_amb_alarm;
315 iattr->s_attr.index = k;
316 res = device_create_file(&pdev->dev,
317 &iattr->s_attr.dev_attr);
318 if (res)
319 goto exit_remove;
320 data->num_attrs++;
321 }
322 }
323
324 res = device_create_file(&pdev->dev, &dev_attr_name);
325 if (res)
326 goto exit_remove;
327
328 data->hwmon_dev = hwmon_device_register(&pdev->dev);
329 if (IS_ERR(data->hwmon_dev)) {
330 res = PTR_ERR(data->hwmon_dev);
331 goto exit_remove;
332 }
333
334 return res;
335
336exit_remove:
337 device_remove_file(&pdev->dev, &dev_attr_name);
338 for (i = 0; i < data->num_attrs; i++)
339 device_remove_file(&pdev->dev, &data->attrs[i].s_attr.dev_attr);
340 kfree(data->attrs);
341
342 return res;
343}
344
345static int __devinit i5k_amb_add(void)
346{
347 int res = -ENODEV;
348
349 /* only ever going to be one of these */
350 amb_pdev = platform_device_alloc(DRVNAME, 0);
351 if (!amb_pdev)
352 return -ENOMEM;
353
354 res = platform_device_add(amb_pdev);
355 if (res)
356 goto err;
357 return 0;
358
359err:
360 platform_device_put(amb_pdev);
361 return res;
362}
363
364static int __devinit i5k_find_amb_registers(struct i5k_amb_data *data)
365{
366 struct pci_dev *pcidev;
367 u32 val32;
368 int res = -ENODEV;
369
370 /* Find AMB register memory space */
371 pcidev = pci_get_device(PCI_VENDOR_ID_INTEL,
372 PCI_DEVICE_ID_INTEL_5000_ERR,
373 NULL);
374 if (!pcidev)
375 return -ENODEV;
376
377 if (pci_read_config_dword(pcidev, I5K_REG_AMB_BASE_ADDR, &val32))
378 goto out;
379 data->amb_base = val32;
380
381 if (pci_read_config_dword(pcidev, I5K_REG_AMB_LEN_ADDR, &val32))
382 goto out;
383 data->amb_len = val32;
384
385 /* Is it big enough? */
386 if (data->amb_len < AMB_CONFIG_SIZE * MAX_AMBS) {
387 dev_err(&pcidev->dev, "AMB region too small!\n");
388 goto out;
389 }
390
391 res = 0;
392out:
393 pci_dev_put(pcidev);
394 return res;
395}
396
397static int __devinit i5k_channel_probe(u16 *amb_present, unsigned long dev_id)
398{
399 struct pci_dev *pcidev;
400 u16 val16;
401 int res = -ENODEV;
402
403 /* Copy the DIMM presence map for these two channels */
404 pcidev = pci_get_device(PCI_VENDOR_ID_INTEL, dev_id, NULL);
405 if (!pcidev)
406 return -ENODEV;
407
408 if (pci_read_config_word(pcidev, I5K_REG_CHAN0_PRESENCE_ADDR, &val16))
409 goto out;
410 amb_present[0] = val16;
411
412 if (pci_read_config_word(pcidev, I5K_REG_CHAN1_PRESENCE_ADDR, &val16))
413 goto out;
414 amb_present[1] = val16;
415
416 res = 0;
417
418out:
419 pci_dev_put(pcidev);
420 return res;
421}
422
423static int __devinit i5k_amb_probe(struct platform_device *pdev)
424{
425 struct i5k_amb_data *data;
426 struct resource *reso;
427 int res = -ENODEV;
428
429 data = kzalloc(sizeof(*data), GFP_KERNEL);
430 if (!data)
431 return -ENOMEM;
432
433 /* Figure out where the AMB registers live */
434 res = i5k_find_amb_registers(data);
435 if (res)
436 goto err;
437
438 /* Copy the DIMM presence map for the first two channels */
439 res = i5k_channel_probe(&data->amb_present[0],
440 PCI_DEVICE_ID_INTEL_5000_FBD0);
441 if (res)
442 goto err;
443
444 /* Copy the DIMM presence map for the optional second two channels */
445 i5k_channel_probe(&data->amb_present[2],
446 PCI_DEVICE_ID_INTEL_5000_FBD1);
447
448 /* Set up resource regions */
449 reso = request_mem_region(data->amb_base, data->amb_len, DRVNAME);
450 if (!reso) {
451 res = -EBUSY;
452 goto err;
453 }
454
455 data->amb_mmio = ioremap_nocache(data->amb_base, data->amb_len);
456 if (!data->amb_mmio) {
457 res = -EBUSY;
458 goto err_map_failed;
459 }
460
461 platform_set_drvdata(pdev, data);
462
463 res = i5k_amb_hwmon_init(pdev);
464 if (res)
465 goto err_init_failed;
466
467 return res;
468
469err_init_failed:
470 iounmap(data->amb_mmio);
471 platform_set_drvdata(pdev, NULL);
472err_map_failed:
473 release_mem_region(data->amb_base, data->amb_len);
474err:
475 kfree(data);
476 return res;
477}
478
479static int __devexit i5k_amb_remove(struct platform_device *pdev)
480{
481 int i;
482 struct i5k_amb_data *data = platform_get_drvdata(pdev);
483
484 hwmon_device_unregister(data->hwmon_dev);
485 device_remove_file(&pdev->dev, &dev_attr_name);
486 for (i = 0; i < data->num_attrs; i++)
487 device_remove_file(&pdev->dev, &data->attrs[i].s_attr.dev_attr);
488 kfree(data->attrs);
489 iounmap(data->amb_mmio);
490 release_mem_region(data->amb_base, data->amb_len);
491 platform_set_drvdata(pdev, NULL);
492 kfree(data);
493 return 0;
494}
495
496static struct platform_driver i5k_amb_driver = {
497 .driver = {
498 .owner = THIS_MODULE,
499 .name = DRVNAME,
500 },
501 .probe = i5k_amb_probe,
502 .remove = __devexit_p(i5k_amb_remove),
503};
504
505static int __init i5k_amb_init(void)
506{
507 int res;
508
509 res = platform_driver_register(&i5k_amb_driver);
510 if (res)
511 return res;
512
513 res = i5k_amb_add();
514 if (res)
515 platform_driver_unregister(&i5k_amb_driver);
516
517 return res;
518}
519
520static void __exit i5k_amb_exit(void)
521{
522 platform_device_unregister(amb_pdev);
523 platform_driver_unregister(&i5k_amb_driver);
524}
525
526MODULE_AUTHOR("Darrick J. Wong <djwong@us.ibm.com>");
527MODULE_DESCRIPTION("Intel 5000 chipset FB-DIMM AMB temperature sensor");
528MODULE_LICENSE("GPL");
529
530module_init(i5k_amb_init);
531module_exit(i5k_amb_exit);