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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
50static unsigned long amb_reg_temp_status(unsigned int amb)
51{
52 return AMB_FUNC_3_OFFSET + AMB_REG_TEMP_STATUS_ADDR +
53 AMB_CONFIG_SIZE * amb;
54}
55
56static unsigned long amb_reg_temp_min(unsigned int amb)
57{
58 return AMB_FUNC_3_OFFSET + AMB_REG_TEMP_MIN_ADDR +
59 AMB_CONFIG_SIZE * amb;
60}
61
62static unsigned long amb_reg_temp_mid(unsigned int amb)
63{
64 return AMB_FUNC_3_OFFSET + AMB_REG_TEMP_MID_ADDR +
65 AMB_CONFIG_SIZE * amb;
66}
67
68static unsigned long amb_reg_temp_max(unsigned int amb)
69{
70 return AMB_FUNC_3_OFFSET + AMB_REG_TEMP_MAX_ADDR +
71 AMB_CONFIG_SIZE * amb;
72}
73
74static unsigned long amb_reg_temp(unsigned int amb)
75{
76 return AMB_FUNC_3_OFFSET + AMB_REG_TEMP_ADDR +
77 AMB_CONFIG_SIZE * amb;
78}
79
80#define MAX_MEM_CHANNELS 4
81#define MAX_AMBS_PER_CHANNEL 16
82#define MAX_AMBS (MAX_MEM_CHANNELS * \
83 MAX_AMBS_PER_CHANNEL)
84#define CHANNEL_SHIFT 4
85#define DIMM_MASK 0xF
86
87
88
89
90
91
92
93#define REAL_MAX_AMBS_PER_CHANNEL 15
94#define KNOBS_PER_AMB 6
95
96static unsigned long amb_num_from_reg(unsigned int byte_num, unsigned int bit)
97{
98 return byte_num * MAX_AMBS_PER_CHANNEL + bit;
99}
100
101#define AMB_SYSFS_NAME_LEN 16
102struct i5k_device_attribute {
103 struct sensor_device_attribute s_attr;
104 char name[AMB_SYSFS_NAME_LEN];
105};
106
107struct i5k_amb_data {
108 struct device *hwmon_dev;
109
110 unsigned long amb_base;
111 unsigned long amb_len;
112 u16 amb_present[MAX_MEM_CHANNELS];
113 void __iomem *amb_mmio;
114 struct i5k_device_attribute *attrs;
115 unsigned int num_attrs;
116 unsigned long chipset_id;
117};
118
119static ssize_t show_name(struct device *dev, struct device_attribute *devattr,
120 char *buf)
121{
122 return sprintf(buf, "%s\n", DRVNAME);
123}
124
125
126static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
127
128static struct platform_device *amb_pdev;
129
130static u8 amb_read_byte(struct i5k_amb_data *data, unsigned long offset)
131{
132 return ioread8(data->amb_mmio + offset);
133}
134
135static void amb_write_byte(struct i5k_amb_data *data, unsigned long offset,
136 u8 val)
137{
138 iowrite8(val, data->amb_mmio + offset);
139}
140
141static ssize_t show_amb_alarm(struct device *dev,
142 struct device_attribute *devattr,
143 char *buf)
144{
145 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
146 struct i5k_amb_data *data = dev_get_drvdata(dev);
147
148 if (!(amb_read_byte(data, amb_reg_temp_status(attr->index)) & 0x20) &&
149 (amb_read_byte(data, amb_reg_temp_status(attr->index)) & 0x8))
150 return sprintf(buf, "1\n");
151 else
152 return sprintf(buf, "0\n");
153}
154
155static ssize_t store_amb_min(struct device *dev,
156 struct device_attribute *devattr,
157 const char *buf,
158 size_t count)
159{
160 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
161 struct i5k_amb_data *data = dev_get_drvdata(dev);
162 unsigned long temp = simple_strtoul(buf, NULL, 10) / 500;
163
164 if (temp > 255)
165 temp = 255;
166
167 amb_write_byte(data, amb_reg_temp_min(attr->index), temp);
168 return count;
169}
170
171static ssize_t store_amb_mid(struct device *dev,
172 struct device_attribute *devattr,
173 const char *buf,
174 size_t count)
175{
176 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
177 struct i5k_amb_data *data = dev_get_drvdata(dev);
178 unsigned long temp = simple_strtoul(buf, NULL, 10) / 500;
179
180 if (temp > 255)
181 temp = 255;
182
183 amb_write_byte(data, amb_reg_temp_mid(attr->index), temp);
184 return count;
185}
186
187static ssize_t store_amb_max(struct device *dev,
188 struct device_attribute *devattr,
189 const char *buf,
190 size_t count)
191{
192 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
193 struct i5k_amb_data *data = dev_get_drvdata(dev);
194 unsigned long temp = simple_strtoul(buf, NULL, 10) / 500;
195
196 if (temp > 255)
197 temp = 255;
198
199 amb_write_byte(data, amb_reg_temp_max(attr->index), temp);
200 return count;
201}
202
203static ssize_t show_amb_min(struct device *dev,
204 struct device_attribute *devattr,
205 char *buf)
206{
207 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
208 struct i5k_amb_data *data = dev_get_drvdata(dev);
209 return sprintf(buf, "%d\n",
210 500 * amb_read_byte(data, amb_reg_temp_min(attr->index)));
211}
212
213static ssize_t show_amb_mid(struct device *dev,
214 struct device_attribute *devattr,
215 char *buf)
216{
217 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
218 struct i5k_amb_data *data = dev_get_drvdata(dev);
219 return sprintf(buf, "%d\n",
220 500 * amb_read_byte(data, amb_reg_temp_mid(attr->index)));
221}
222
223static ssize_t show_amb_max(struct device *dev,
224 struct device_attribute *devattr,
225 char *buf)
226{
227 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
228 struct i5k_amb_data *data = dev_get_drvdata(dev);
229 return sprintf(buf, "%d\n",
230 500 * amb_read_byte(data, amb_reg_temp_max(attr->index)));
231}
232
233static ssize_t show_amb_temp(struct device *dev,
234 struct device_attribute *devattr,
235 char *buf)
236{
237 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
238 struct i5k_amb_data *data = dev_get_drvdata(dev);
239 return sprintf(buf, "%d\n",
240 500 * amb_read_byte(data, amb_reg_temp(attr->index)));
241}
242
243static ssize_t show_label(struct device *dev,
244 struct device_attribute *devattr,
245 char *buf)
246{
247 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
248
249 return sprintf(buf, "Ch. %d DIMM %d\n", attr->index >> CHANNEL_SHIFT,
250 attr->index & DIMM_MASK);
251}
252
253static int __devinit i5k_amb_hwmon_init(struct platform_device *pdev)
254{
255 int i, j, k, d = 0;
256 u16 c;
257 int res = 0;
258 int num_ambs = 0;
259 struct i5k_amb_data *data = platform_get_drvdata(pdev);
260
261
262
263 for (i = 0; i < MAX_MEM_CHANNELS; i++)
264 num_ambs += hweight16(data->amb_present[i] & 0x7fff);
265
266
267 data->attrs = kzalloc(sizeof(*data->attrs) * num_ambs * KNOBS_PER_AMB,
268 GFP_KERNEL);
269 if (!data->attrs)
270 return -ENOMEM;
271 data->num_attrs = 0;
272
273 for (i = 0; i < MAX_MEM_CHANNELS; i++) {
274 c = data->amb_present[i];
275 for (j = 0; j < REAL_MAX_AMBS_PER_CHANNEL; j++, c >>= 1) {
276 struct i5k_device_attribute *iattr;
277
278 k = amb_num_from_reg(i, j);
279 if (!(c & 0x1))
280 continue;
281 d++;
282
283
284 iattr = data->attrs + data->num_attrs;
285 snprintf(iattr->name, AMB_SYSFS_NAME_LEN,
286 "temp%d_label", d);
287 iattr->s_attr.dev_attr.attr.name = iattr->name;
288 iattr->s_attr.dev_attr.attr.mode = S_IRUGO;
289 iattr->s_attr.dev_attr.show = show_label;
290 iattr->s_attr.index = k;
291 res = device_create_file(&pdev->dev,
292 &iattr->s_attr.dev_attr);
293 if (res)
294 goto exit_remove;
295 data->num_attrs++;
296
297
298 iattr = data->attrs + data->num_attrs;
299 snprintf(iattr->name, AMB_SYSFS_NAME_LEN,
300 "temp%d_input", d);
301 iattr->s_attr.dev_attr.attr.name = iattr->name;
302 iattr->s_attr.dev_attr.attr.mode = S_IRUGO;
303 iattr->s_attr.dev_attr.show = show_amb_temp;
304 iattr->s_attr.index = k;
305 res = device_create_file(&pdev->dev,
306 &iattr->s_attr.dev_attr);
307 if (res)
308 goto exit_remove;
309 data->num_attrs++;
310
311
312 iattr = data->attrs + data->num_attrs;
313 snprintf(iattr->name, AMB_SYSFS_NAME_LEN,
314 "temp%d_min", d);
315 iattr->s_attr.dev_attr.attr.name = iattr->name;
316 iattr->s_attr.dev_attr.attr.mode = S_IWUSR | S_IRUGO;
317 iattr->s_attr.dev_attr.show = show_amb_min;
318 iattr->s_attr.dev_attr.store = store_amb_min;
319 iattr->s_attr.index = k;
320 res = device_create_file(&pdev->dev,
321 &iattr->s_attr.dev_attr);
322 if (res)
323 goto exit_remove;
324 data->num_attrs++;
325
326
327 iattr = data->attrs + data->num_attrs;
328 snprintf(iattr->name, AMB_SYSFS_NAME_LEN,
329 "temp%d_mid", d);
330 iattr->s_attr.dev_attr.attr.name = iattr->name;
331 iattr->s_attr.dev_attr.attr.mode = S_IWUSR | S_IRUGO;
332 iattr->s_attr.dev_attr.show = show_amb_mid;
333 iattr->s_attr.dev_attr.store = store_amb_mid;
334 iattr->s_attr.index = k;
335 res = device_create_file(&pdev->dev,
336 &iattr->s_attr.dev_attr);
337 if (res)
338 goto exit_remove;
339 data->num_attrs++;
340
341
342 iattr = data->attrs + data->num_attrs;
343 snprintf(iattr->name, AMB_SYSFS_NAME_LEN,
344 "temp%d_max", d);
345 iattr->s_attr.dev_attr.attr.name = iattr->name;
346 iattr->s_attr.dev_attr.attr.mode = S_IWUSR | S_IRUGO;
347 iattr->s_attr.dev_attr.show = show_amb_max;
348 iattr->s_attr.dev_attr.store = store_amb_max;
349 iattr->s_attr.index = k;
350 res = device_create_file(&pdev->dev,
351 &iattr->s_attr.dev_attr);
352 if (res)
353 goto exit_remove;
354 data->num_attrs++;
355
356
357 iattr = data->attrs + data->num_attrs;
358 snprintf(iattr->name, AMB_SYSFS_NAME_LEN,
359 "temp%d_alarm", d);
360 iattr->s_attr.dev_attr.attr.name = iattr->name;
361 iattr->s_attr.dev_attr.attr.mode = S_IRUGO;
362 iattr->s_attr.dev_attr.show = show_amb_alarm;
363 iattr->s_attr.index = k;
364 res = device_create_file(&pdev->dev,
365 &iattr->s_attr.dev_attr);
366 if (res)
367 goto exit_remove;
368 data->num_attrs++;
369 }
370 }
371
372 res = device_create_file(&pdev->dev, &dev_attr_name);
373 if (res)
374 goto exit_remove;
375
376 data->hwmon_dev = hwmon_device_register(&pdev->dev);
377 if (IS_ERR(data->hwmon_dev)) {
378 res = PTR_ERR(data->hwmon_dev);
379 goto exit_remove;
380 }
381
382 return res;
383
384exit_remove:
385 device_remove_file(&pdev->dev, &dev_attr_name);
386 for (i = 0; i < data->num_attrs; i++)
387 device_remove_file(&pdev->dev, &data->attrs[i].s_attr.dev_attr);
388 kfree(data->attrs);
389
390 return res;
391}
392
393static int __devinit i5k_amb_add(void)
394{
395 int res = -ENODEV;
396
397
398 amb_pdev = platform_device_alloc(DRVNAME, 0);
399 if (!amb_pdev)
400 return -ENOMEM;
401
402 res = platform_device_add(amb_pdev);
403 if (res)
404 goto err;
405 return 0;
406
407err:
408 platform_device_put(amb_pdev);
409 return res;
410}
411
412static int __devinit i5k_find_amb_registers(struct i5k_amb_data *data,
413 unsigned long devid)
414{
415 struct pci_dev *pcidev;
416 u32 val32;
417 int res = -ENODEV;
418
419
420 pcidev = pci_get_device(PCI_VENDOR_ID_INTEL,
421 devid,
422 NULL);
423 if (!pcidev)
424 return -ENODEV;
425
426 if (pci_read_config_dword(pcidev, I5K_REG_AMB_BASE_ADDR, &val32))
427 goto out;
428 data->amb_base = val32;
429
430 if (pci_read_config_dword(pcidev, I5K_REG_AMB_LEN_ADDR, &val32))
431 goto out;
432 data->amb_len = val32;
433
434
435 if (data->amb_len < AMB_CONFIG_SIZE * MAX_AMBS) {
436 dev_err(&pcidev->dev, "AMB region too small!\n");
437 goto out;
438 }
439
440 data->chipset_id = devid;
441
442 res = 0;
443out:
444 pci_dev_put(pcidev);
445 return res;
446}
447
448static int __devinit i5k_channel_probe(u16 *amb_present, unsigned long dev_id)
449{
450 struct pci_dev *pcidev;
451 u16 val16;
452 int res = -ENODEV;
453
454
455 pcidev = pci_get_device(PCI_VENDOR_ID_INTEL, dev_id, NULL);
456 if (!pcidev)
457 return -ENODEV;
458
459 if (pci_read_config_word(pcidev, I5K_REG_CHAN0_PRESENCE_ADDR, &val16))
460 goto out;
461 amb_present[0] = val16;
462
463 if (pci_read_config_word(pcidev, I5K_REG_CHAN1_PRESENCE_ADDR, &val16))
464 goto out;
465 amb_present[1] = val16;
466
467 res = 0;
468
469out:
470 pci_dev_put(pcidev);
471 return res;
472}
473
474static unsigned long i5k_channel_pci_id(struct i5k_amb_data *data,
475 unsigned long channel)
476{
477 switch (data->chipset_id) {
478 case PCI_DEVICE_ID_INTEL_5000_ERR:
479 return PCI_DEVICE_ID_INTEL_5000_FBD0 + channel;
480 case PCI_DEVICE_ID_INTEL_5400_ERR:
481 return PCI_DEVICE_ID_INTEL_5400_FBD0 + channel;
482 default:
483 BUG();
484 }
485}
486
487static unsigned long chipset_ids[] = {
488 PCI_DEVICE_ID_INTEL_5000_ERR,
489 PCI_DEVICE_ID_INTEL_5400_ERR,
490 0
491};
492
493static struct pci_device_id i5k_amb_ids[] __devinitdata = {
494 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_5000_ERR) },
495 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_5400_ERR) },
496 { 0, }
497};
498MODULE_DEVICE_TABLE(pci, i5k_amb_ids);
499
500static int __devinit i5k_amb_probe(struct platform_device *pdev)
501{
502 struct i5k_amb_data *data;
503 struct resource *reso;
504 int i;
505 int res = -ENODEV;
506
507 data = kzalloc(sizeof(*data), GFP_KERNEL);
508 if (!data)
509 return -ENOMEM;
510
511
512 i = 0;
513 do {
514 res = i5k_find_amb_registers(data, chipset_ids[i]);
515 i++;
516 } while (res && chipset_ids[i]);
517
518 if (res)
519 goto err;
520
521
522 res = i5k_channel_probe(&data->amb_present[0],
523 i5k_channel_pci_id(data, 0));
524 if (res)
525 goto err;
526
527
528 i5k_channel_probe(&data->amb_present[2],
529 i5k_channel_pci_id(data, 1));
530
531
532 reso = request_mem_region(data->amb_base, data->amb_len, DRVNAME);
533 if (!reso) {
534 res = -EBUSY;
535 goto err;
536 }
537
538 data->amb_mmio = ioremap_nocache(data->amb_base, data->amb_len);
539 if (!data->amb_mmio) {
540 res = -EBUSY;
541 goto err_map_failed;
542 }
543
544 platform_set_drvdata(pdev, data);
545
546 res = i5k_amb_hwmon_init(pdev);
547 if (res)
548 goto err_init_failed;
549
550 return res;
551
552err_init_failed:
553 iounmap(data->amb_mmio);
554 platform_set_drvdata(pdev, NULL);
555err_map_failed:
556 release_mem_region(data->amb_base, data->amb_len);
557err:
558 kfree(data);
559 return res;
560}
561
562static int __devexit i5k_amb_remove(struct platform_device *pdev)
563{
564 int i;
565 struct i5k_amb_data *data = platform_get_drvdata(pdev);
566
567 hwmon_device_unregister(data->hwmon_dev);
568 device_remove_file(&pdev->dev, &dev_attr_name);
569 for (i = 0; i < data->num_attrs; i++)
570 device_remove_file(&pdev->dev, &data->attrs[i].s_attr.dev_attr);
571 kfree(data->attrs);
572 iounmap(data->amb_mmio);
573 release_mem_region(data->amb_base, data->amb_len);
574 platform_set_drvdata(pdev, NULL);
575 kfree(data);
576 return 0;
577}
578
579static struct platform_driver i5k_amb_driver = {
580 .driver = {
581 .owner = THIS_MODULE,
582 .name = DRVNAME,
583 },
584 .probe = i5k_amb_probe,
585 .remove = __devexit_p(i5k_amb_remove),
586};
587
588static int __init i5k_amb_init(void)
589{
590 int res;
591
592 res = platform_driver_register(&i5k_amb_driver);
593 if (res)
594 return res;
595
596 res = i5k_amb_add();
597 if (res)
598 platform_driver_unregister(&i5k_amb_driver);
599
600 return res;
601}
602
603static void __exit i5k_amb_exit(void)
604{
605 platform_device_unregister(amb_pdev);
606 platform_driver_unregister(&i5k_amb_driver);
607}
608
609MODULE_AUTHOR("Darrick J. Wong <djwong@us.ibm.com>");
610MODULE_DESCRIPTION("Intel 5000 chipset FB-DIMM AMB temperature sensor");
611MODULE_LICENSE("GPL");
612
613module_init(i5k_amb_init);
614module_exit(i5k_amb_exit);
615
