Commit | Line | Data |
---|---|---|
298c7524 DW |
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 | |
79 | struct i5k_device_attribute { | |
80 | struct sensor_device_attribute s_attr; | |
81 | char name[AMB_SYSFS_NAME_LEN]; | |
82 | }; | |
83 | ||
84 | struct 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 | ||
95 | static 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 | ||
102 | static DEVICE_ATTR(name, S_IRUGO, show_name, NULL); | |
103 | ||
104 | static struct platform_device *amb_pdev; | |
105 | ||
106 | static u8 amb_read_byte(struct i5k_amb_data *data, unsigned long offset) | |
107 | { | |
108 | return ioread8(data->amb_mmio + offset); | |
109 | } | |
110 | ||
111 | static 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 | ||
117 | static 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 | ||
131 | static 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 | ||
147 | static 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 | ||
163 | static 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 | ||
179 | static 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 | ||
189 | static 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 | ||
199 | static 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 | ||
209 | static 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 | ||
219 | static 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 | ||
336 | exit_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 | ||
345 | static 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 | ||
359 | err: | |
360 | platform_device_put(amb_pdev); | |
361 | return res; | |
362 | } | |
363 | ||
364 | static 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; | |
392 | out: | |
393 | pci_dev_put(pcidev); | |
394 | return res; | |
395 | } | |
396 | ||
397 | static 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 | ||
418 | out: | |
419 | pci_dev_put(pcidev); | |
420 | return res; | |
421 | } | |
422 | ||
423 | static 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 | ||
469 | err_init_failed: | |
470 | iounmap(data->amb_mmio); | |
471 | platform_set_drvdata(pdev, NULL); | |
472 | err_map_failed: | |
473 | release_mem_region(data->amb_base, data->amb_len); | |
474 | err: | |
475 | kfree(data); | |
476 | return res; | |
477 | } | |
478 | ||
479 | static 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 | ||
496 | static 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 | ||
505 | static 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 | ||
520 | static void __exit i5k_amb_exit(void) | |
521 | { | |
522 | platform_device_unregister(amb_pdev); | |
523 | platform_driver_unregister(&i5k_amb_driver); | |
524 | } | |
525 | ||
526 | MODULE_AUTHOR("Darrick J. Wong <djwong@us.ibm.com>"); | |
527 | MODULE_DESCRIPTION("Intel 5000 chipset FB-DIMM AMB temperature sensor"); | |
528 | MODULE_LICENSE("GPL"); | |
529 | ||
530 | module_init(i5k_amb_init); | |
531 | module_exit(i5k_amb_exit); |