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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * A hwmon driver for the Intel 5000 series chipset FB-DIMM AMB
4 * temperature sensors
5 * Copyright (C) 2007 IBM
6 *
7 * Author: Darrick J. Wong <darrick.wong@oracle.com>
8 */
9
10#include <linux/module.h>
11#include <linux/hwmon.h>
12#include <linux/hwmon-sysfs.h>
13#include <linux/err.h>
14#include <linux/mutex.h>
15#include <linux/log2.h>
16#include <linux/pci.h>
17#include <linux/platform_device.h>
18#include <linux/slab.h>
19
20#define DRVNAME "i5k_amb"
21
22#define I5K_REG_AMB_BASE_ADDR 0x48
23#define I5K_REG_AMB_LEN_ADDR 0x50
24#define I5K_REG_CHAN0_PRESENCE_ADDR 0x64
25#define I5K_REG_CHAN1_PRESENCE_ADDR 0x66
26
27#define AMB_REG_TEMP_MIN_ADDR 0x80
28#define AMB_REG_TEMP_MID_ADDR 0x81
29#define AMB_REG_TEMP_MAX_ADDR 0x82
30#define AMB_REG_TEMP_STATUS_ADDR 0x84
31#define AMB_REG_TEMP_ADDR 0x85
32
33#define AMB_CONFIG_SIZE 2048
34#define AMB_FUNC_3_OFFSET 768
35
36static unsigned long amb_reg_temp_status(unsigned int amb)
37{
38 return AMB_FUNC_3_OFFSET + AMB_REG_TEMP_STATUS_ADDR +
39 AMB_CONFIG_SIZE * amb;
40}
41
42static unsigned long amb_reg_temp_min(unsigned int amb)
43{
44 return AMB_FUNC_3_OFFSET + AMB_REG_TEMP_MIN_ADDR +
45 AMB_CONFIG_SIZE * amb;
46}
47
48static unsigned long amb_reg_temp_mid(unsigned int amb)
49{
50 return AMB_FUNC_3_OFFSET + AMB_REG_TEMP_MID_ADDR +
51 AMB_CONFIG_SIZE * amb;
52}
53
54static unsigned long amb_reg_temp_max(unsigned int amb)
55{
56 return AMB_FUNC_3_OFFSET + AMB_REG_TEMP_MAX_ADDR +
57 AMB_CONFIG_SIZE * amb;
58}
59
60static unsigned long amb_reg_temp(unsigned int amb)
61{
62 return AMB_FUNC_3_OFFSET + AMB_REG_TEMP_ADDR +
63 AMB_CONFIG_SIZE * amb;
64}
65
66#define MAX_MEM_CHANNELS 4
67#define MAX_AMBS_PER_CHANNEL 16
68#define MAX_AMBS (MAX_MEM_CHANNELS * \
69 MAX_AMBS_PER_CHANNEL)
70#define CHANNEL_SHIFT 4
71#define DIMM_MASK 0xF
72/*
73 * Ugly hack: For some reason the highest bit is set if there
74 * are _any_ DIMMs in the channel. Attempting to read from
75 * this "high-order" AMB results in a memory bus error, so
76 * for now we'll just ignore that top bit, even though that
77 * might prevent us from seeing the 16th DIMM in the channel.
78 */
79#define REAL_MAX_AMBS_PER_CHANNEL 15
80#define KNOBS_PER_AMB 6
81
82static unsigned long amb_num_from_reg(unsigned int byte_num, unsigned int bit)
83{
84 return byte_num * MAX_AMBS_PER_CHANNEL + bit;
85}
86
87#define AMB_SYSFS_NAME_LEN 16
88struct i5k_device_attribute {
89 struct sensor_device_attribute s_attr;
90 char name[AMB_SYSFS_NAME_LEN];
91};
92
93struct i5k_amb_data {
94 struct device *hwmon_dev;
95
96 unsigned long amb_base;
97 unsigned long amb_len;
98 u16 amb_present[MAX_MEM_CHANNELS];
99 void __iomem *amb_mmio;
100 struct i5k_device_attribute *attrs;
101 unsigned int num_attrs;
102};
103
104static ssize_t name_show(struct device *dev, struct device_attribute *devattr,
105 char *buf)
106{
107 return sprintf(buf, "%s\n", DRVNAME);
108}
109
110
111static DEVICE_ATTR_RO(name);
112
113static struct platform_device *amb_pdev;
114
115static u8 amb_read_byte(struct i5k_amb_data *data, unsigned long offset)
116{
117 return ioread8(data->amb_mmio + offset);
118}
119
120static void amb_write_byte(struct i5k_amb_data *data, unsigned long offset,
121 u8 val)
122{
123 iowrite8(val, data->amb_mmio + offset);
124}
125
126static ssize_t show_amb_alarm(struct device *dev,
127 struct device_attribute *devattr,
128 char *buf)
129{
130 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
131 struct i5k_amb_data *data = dev_get_drvdata(dev);
132
133 if (!(amb_read_byte(data, amb_reg_temp_status(attr->index)) & 0x20) &&
134 (amb_read_byte(data, amb_reg_temp_status(attr->index)) & 0x8))
135 return sprintf(buf, "1\n");
136 else
137 return sprintf(buf, "0\n");
138}
139
140static ssize_t store_amb_min(struct device *dev,
141 struct device_attribute *devattr,
142 const char *buf,
143 size_t count)
144{
145 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
146 struct i5k_amb_data *data = dev_get_drvdata(dev);
147 unsigned long temp;
148 int ret = kstrtoul(buf, 10, &temp);
149 if (ret < 0)
150 return ret;
151
152 temp = temp / 500;
153 if (temp > 255)
154 temp = 255;
155
156 amb_write_byte(data, amb_reg_temp_min(attr->index), temp);
157 return count;
158}
159
160static ssize_t store_amb_mid(struct device *dev,
161 struct device_attribute *devattr,
162 const char *buf,
163 size_t count)
164{
165 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
166 struct i5k_amb_data *data = dev_get_drvdata(dev);
167 unsigned long temp;
168 int ret = kstrtoul(buf, 10, &temp);
169 if (ret < 0)
170 return ret;
171
172 temp = temp / 500;
173 if (temp > 255)
174 temp = 255;
175
176 amb_write_byte(data, amb_reg_temp_mid(attr->index), temp);
177 return count;
178}
179
180static ssize_t store_amb_max(struct device *dev,
181 struct device_attribute *devattr,
182 const char *buf,
183 size_t count)
184{
185 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
186 struct i5k_amb_data *data = dev_get_drvdata(dev);
187 unsigned long temp;
188 int ret = kstrtoul(buf, 10, &temp);
189 if (ret < 0)
190 return ret;
191
192 temp = temp / 500;
193 if (temp > 255)
194 temp = 255;
195
196 amb_write_byte(data, amb_reg_temp_max(attr->index), temp);
197 return count;
198}
199
200static ssize_t show_amb_min(struct device *dev,
201 struct device_attribute *devattr,
202 char *buf)
203{
204 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
205 struct i5k_amb_data *data = dev_get_drvdata(dev);
206 return sprintf(buf, "%d\n",
207 500 * amb_read_byte(data, amb_reg_temp_min(attr->index)));
208}
209
210static ssize_t show_amb_mid(struct device *dev,
211 struct device_attribute *devattr,
212 char *buf)
213{
214 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
215 struct i5k_amb_data *data = dev_get_drvdata(dev);
216 return sprintf(buf, "%d\n",
217 500 * amb_read_byte(data, amb_reg_temp_mid(attr->index)));
218}
219
220static ssize_t show_amb_max(struct device *dev,
221 struct device_attribute *devattr,
222 char *buf)
223{
224 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
225 struct i5k_amb_data *data = dev_get_drvdata(dev);
226 return sprintf(buf, "%d\n",
227 500 * amb_read_byte(data, amb_reg_temp_max(attr->index)));
228}
229
230static ssize_t show_amb_temp(struct device *dev,
231 struct device_attribute *devattr,
232 char *buf)
233{
234 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
235 struct i5k_amb_data *data = dev_get_drvdata(dev);
236 return sprintf(buf, "%d\n",
237 500 * amb_read_byte(data, amb_reg_temp(attr->index)));
238}
239
240static ssize_t show_label(struct device *dev,
241 struct device_attribute *devattr,
242 char *buf)
243{
244 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
245
246 return sprintf(buf, "Ch. %d DIMM %d\n", attr->index >> CHANNEL_SHIFT,
247 attr->index & DIMM_MASK);
248}
249
250static int i5k_amb_hwmon_init(struct platform_device *pdev)
251{
252 int i, j, k, d = 0;
253 u16 c;
254 int res = 0;
255 int num_ambs = 0;
256 struct i5k_amb_data *data = platform_get_drvdata(pdev);
257
258 /* Count the number of AMBs found */
259 /* ignore the high-order bit, see "Ugly hack" comment above */
260 for (i = 0; i < MAX_MEM_CHANNELS; i++)
261 num_ambs += hweight16(data->amb_present[i] & 0x7fff);
262
263 /* Set up sysfs stuff */
264 data->attrs = kzalloc(array3_size(num_ambs, KNOBS_PER_AMB,
265 sizeof(*data->attrs)),
266 GFP_KERNEL);
267 if (!data->attrs)
268 return -ENOMEM;
269 data->num_attrs = 0;
270
271 for (i = 0; i < MAX_MEM_CHANNELS; i++) {
272 c = data->amb_present[i];
273 for (j = 0; j < REAL_MAX_AMBS_PER_CHANNEL; j++, c >>= 1) {
274 struct i5k_device_attribute *iattr;
275
276 k = amb_num_from_reg(i, j);
277 if (!(c & 0x1))
278 continue;
279 d++;
280
281 /* sysfs label */
282 iattr = data->attrs + data->num_attrs;
283 snprintf(iattr->name, AMB_SYSFS_NAME_LEN,
284 "temp%d_label", d);
285 iattr->s_attr.dev_attr.attr.name = iattr->name;
286 iattr->s_attr.dev_attr.attr.mode = 0444;
287 iattr->s_attr.dev_attr.show = show_label;
288 iattr->s_attr.index = k;
289 sysfs_attr_init(&iattr->s_attr.dev_attr.attr);
290 res = device_create_file(&pdev->dev,
291 &iattr->s_attr.dev_attr);
292 if (res)
293 goto exit_remove;
294 data->num_attrs++;
295
296 /* Temperature sysfs knob */
297 iattr = data->attrs + data->num_attrs;
298 snprintf(iattr->name, AMB_SYSFS_NAME_LEN,
299 "temp%d_input", d);
300 iattr->s_attr.dev_attr.attr.name = iattr->name;
301 iattr->s_attr.dev_attr.attr.mode = 0444;
302 iattr->s_attr.dev_attr.show = show_amb_temp;
303 iattr->s_attr.index = k;
304 sysfs_attr_init(&iattr->s_attr.dev_attr.attr);
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 /* Temperature min sysfs knob */
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 = 0644;
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 sysfs_attr_init(&iattr->s_attr.dev_attr.attr);
321 res = device_create_file(&pdev->dev,
322 &iattr->s_attr.dev_attr);
323 if (res)
324 goto exit_remove;
325 data->num_attrs++;
326
327 /* Temperature mid sysfs knob */
328 iattr = data->attrs + data->num_attrs;
329 snprintf(iattr->name, AMB_SYSFS_NAME_LEN,
330 "temp%d_mid", d);
331 iattr->s_attr.dev_attr.attr.name = iattr->name;
332 iattr->s_attr.dev_attr.attr.mode = 0644;
333 iattr->s_attr.dev_attr.show = show_amb_mid;
334 iattr->s_attr.dev_attr.store = store_amb_mid;
335 iattr->s_attr.index = k;
336 sysfs_attr_init(&iattr->s_attr.dev_attr.attr);
337 res = device_create_file(&pdev->dev,
338 &iattr->s_attr.dev_attr);
339 if (res)
340 goto exit_remove;
341 data->num_attrs++;
342
343 /* Temperature max sysfs knob */
344 iattr = data->attrs + data->num_attrs;
345 snprintf(iattr->name, AMB_SYSFS_NAME_LEN,
346 "temp%d_max", d);
347 iattr->s_attr.dev_attr.attr.name = iattr->name;
348 iattr->s_attr.dev_attr.attr.mode = 0644;
349 iattr->s_attr.dev_attr.show = show_amb_max;
350 iattr->s_attr.dev_attr.store = store_amb_max;
351 iattr->s_attr.index = k;
352 sysfs_attr_init(&iattr->s_attr.dev_attr.attr);
353 res = device_create_file(&pdev->dev,
354 &iattr->s_attr.dev_attr);
355 if (res)
356 goto exit_remove;
357 data->num_attrs++;
358
359 /* Temperature alarm sysfs knob */
360 iattr = data->attrs + data->num_attrs;
361 snprintf(iattr->name, AMB_SYSFS_NAME_LEN,
362 "temp%d_alarm", d);
363 iattr->s_attr.dev_attr.attr.name = iattr->name;
364 iattr->s_attr.dev_attr.attr.mode = 0444;
365 iattr->s_attr.dev_attr.show = show_amb_alarm;
366 iattr->s_attr.index = k;
367 sysfs_attr_init(&iattr->s_attr.dev_attr.attr);
368 res = device_create_file(&pdev->dev,
369 &iattr->s_attr.dev_attr);
370 if (res)
371 goto exit_remove;
372 data->num_attrs++;
373 }
374 }
375
376 res = device_create_file(&pdev->dev, &dev_attr_name);
377 if (res)
378 goto exit_remove;
379
380 data->hwmon_dev = hwmon_device_register(&pdev->dev);
381 if (IS_ERR(data->hwmon_dev)) {
382 res = PTR_ERR(data->hwmon_dev);
383 goto exit_remove;
384 }
385
386 return res;
387
388exit_remove:
389 device_remove_file(&pdev->dev, &dev_attr_name);
390 for (i = 0; i < data->num_attrs; i++)
391 device_remove_file(&pdev->dev, &data->attrs[i].s_attr.dev_attr);
392 kfree(data->attrs);
393
394 return res;
395}
396
397static int i5k_amb_add(void)
398{
399 int res;
400
401 /* only ever going to be one of these */
402 amb_pdev = platform_device_alloc(DRVNAME, 0);
403 if (!amb_pdev)
404 return -ENOMEM;
405
406 res = platform_device_add(amb_pdev);
407 if (res)
408 goto err;
409 return 0;
410
411err:
412 platform_device_put(amb_pdev);
413 return res;
414}
415
416static int i5k_find_amb_registers(struct i5k_amb_data *data,
417 unsigned long devid)
418{
419 struct pci_dev *pcidev;
420 u32 val32;
421 int res = -ENODEV;
422
423 /* Find AMB register memory space */
424 pcidev = pci_get_device(PCI_VENDOR_ID_INTEL,
425 devid,
426 NULL);
427 if (!pcidev)
428 return -ENODEV;
429
430 pci_read_config_dword(pcidev, I5K_REG_AMB_BASE_ADDR, &val32);
431 if (val32 == (u32)~0)
432 goto out;
433 data->amb_base = val32;
434
435 pci_read_config_dword(pcidev, I5K_REG_AMB_LEN_ADDR, &val32);
436 if (val32 == (u32)~0)
437 goto out;
438 data->amb_len = val32;
439
440 /* Is it big enough? */
441 if (data->amb_len < AMB_CONFIG_SIZE * MAX_AMBS) {
442 dev_err(&pcidev->dev, "AMB region too small!\n");
443 goto out;
444 }
445
446 res = 0;
447out:
448 pci_dev_put(pcidev);
449 return res;
450}
451
452static int i5k_channel_probe(u16 *amb_present, unsigned long dev_id)
453{
454 struct pci_dev *pcidev;
455 u16 val16;
456 int res = -ENODEV;
457
458 /* Copy the DIMM presence map for these two channels */
459 pcidev = pci_get_device(PCI_VENDOR_ID_INTEL, dev_id, NULL);
460 if (!pcidev)
461 return -ENODEV;
462
463 pci_read_config_word(pcidev, I5K_REG_CHAN0_PRESENCE_ADDR, &val16);
464 if (val16 == (u16)~0)
465 goto out;
466 amb_present[0] = val16;
467
468 pci_read_config_word(pcidev, I5K_REG_CHAN1_PRESENCE_ADDR, &val16);
469 if (val16 == (u16)~0)
470 goto out;
471 amb_present[1] = val16;
472
473 res = 0;
474
475out:
476 pci_dev_put(pcidev);
477 return res;
478}
479
480static struct {
481 unsigned long err;
482 unsigned long fbd0;
483} chipset_ids[] = {
484 { PCI_DEVICE_ID_INTEL_5000_ERR, PCI_DEVICE_ID_INTEL_5000_FBD0 },
485 { PCI_DEVICE_ID_INTEL_5400_ERR, PCI_DEVICE_ID_INTEL_5400_FBD0 },
486 { 0, 0 }
487};
488
489#ifdef MODULE
490static const struct pci_device_id i5k_amb_ids[] = {
491 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_5000_ERR) },
492 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_5400_ERR) },
493 { 0, }
494};
495MODULE_DEVICE_TABLE(pci, i5k_amb_ids);
496#endif
497
498static int i5k_amb_probe(struct platform_device *pdev)
499{
500 struct i5k_amb_data *data;
501 struct resource *reso;
502 int i, res;
503
504 data = kzalloc(sizeof(*data), GFP_KERNEL);
505 if (!data)
506 return -ENOMEM;
507
508 /* Figure out where the AMB registers live */
509 i = 0;
510 do {
511 res = i5k_find_amb_registers(data, chipset_ids[i].err);
512 if (res == 0)
513 break;
514 i++;
515 } while (chipset_ids[i].err);
516
517 if (res)
518 goto err;
519
520 /* Copy the DIMM presence map for the first two channels */
521 res = i5k_channel_probe(&data->amb_present[0], chipset_ids[i].fbd0);
522 if (res)
523 goto err;
524
525 /* Copy the DIMM presence map for the optional second two channels */
526 i5k_channel_probe(&data->amb_present[2], chipset_ids[i].fbd0 + 1);
527
528 /* Set up resource regions */
529 reso = request_mem_region(data->amb_base, data->amb_len, DRVNAME);
530 if (!reso) {
531 res = -EBUSY;
532 goto err;
533 }
534
535 data->amb_mmio = ioremap(data->amb_base, data->amb_len);
536 if (!data->amb_mmio) {
537 res = -EBUSY;
538 goto err_map_failed;
539 }
540
541 platform_set_drvdata(pdev, data);
542
543 res = i5k_amb_hwmon_init(pdev);
544 if (res)
545 goto err_init_failed;
546
547 return res;
548
549err_init_failed:
550 iounmap(data->amb_mmio);
551err_map_failed:
552 release_mem_region(data->amb_base, data->amb_len);
553err:
554 kfree(data);
555 return res;
556}
557
558static int i5k_amb_remove(struct platform_device *pdev)
559{
560 int i;
561 struct i5k_amb_data *data = platform_get_drvdata(pdev);
562
563 hwmon_device_unregister(data->hwmon_dev);
564 device_remove_file(&pdev->dev, &dev_attr_name);
565 for (i = 0; i < data->num_attrs; i++)
566 device_remove_file(&pdev->dev, &data->attrs[i].s_attr.dev_attr);
567 kfree(data->attrs);
568 iounmap(data->amb_mmio);
569 release_mem_region(data->amb_base, data->amb_len);
570 kfree(data);
571 return 0;
572}
573
574static struct platform_driver i5k_amb_driver = {
575 .driver = {
576 .name = DRVNAME,
577 },
578 .probe = i5k_amb_probe,
579 .remove = i5k_amb_remove,
580};
581
582static int __init i5k_amb_init(void)
583{
584 int res;
585
586 res = platform_driver_register(&i5k_amb_driver);
587 if (res)
588 return res;
589
590 res = i5k_amb_add();
591 if (res)
592 platform_driver_unregister(&i5k_amb_driver);
593
594 return res;
595}
596
597static void __exit i5k_amb_exit(void)
598{
599 platform_device_unregister(amb_pdev);
600 platform_driver_unregister(&i5k_amb_driver);
601}
602
603MODULE_AUTHOR("Darrick J. Wong <darrick.wong@oracle.com>");
604MODULE_DESCRIPTION("Intel 5000 chipset FB-DIMM AMB temperature sensor");
605MODULE_LICENSE("GPL");
606
607module_init(i5k_amb_init);
608module_exit(i5k_amb_exit);
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * A hwmon driver for the Intel 5000 series chipset FB-DIMM AMB
4 * temperature sensors
5 * Copyright (C) 2007 IBM
6 *
7 * Author: Darrick J. Wong <darrick.wong@oracle.com>
8 */
9
10#include <linux/module.h>
11#include <linux/hwmon.h>
12#include <linux/hwmon-sysfs.h>
13#include <linux/err.h>
14#include <linux/mutex.h>
15#include <linux/log2.h>
16#include <linux/pci.h>
17#include <linux/platform_device.h>
18#include <linux/slab.h>
19
20#define DRVNAME "i5k_amb"
21
22#define I5K_REG_AMB_BASE_ADDR 0x48
23#define I5K_REG_AMB_LEN_ADDR 0x50
24#define I5K_REG_CHAN0_PRESENCE_ADDR 0x64
25#define I5K_REG_CHAN1_PRESENCE_ADDR 0x66
26
27#define AMB_REG_TEMP_MIN_ADDR 0x80
28#define AMB_REG_TEMP_MID_ADDR 0x81
29#define AMB_REG_TEMP_MAX_ADDR 0x82
30#define AMB_REG_TEMP_STATUS_ADDR 0x84
31#define AMB_REG_TEMP_ADDR 0x85
32
33#define AMB_CONFIG_SIZE 2048
34#define AMB_FUNC_3_OFFSET 768
35
36static unsigned long amb_reg_temp_status(unsigned int amb)
37{
38 return AMB_FUNC_3_OFFSET + AMB_REG_TEMP_STATUS_ADDR +
39 AMB_CONFIG_SIZE * amb;
40}
41
42static unsigned long amb_reg_temp_min(unsigned int amb)
43{
44 return AMB_FUNC_3_OFFSET + AMB_REG_TEMP_MIN_ADDR +
45 AMB_CONFIG_SIZE * amb;
46}
47
48static unsigned long amb_reg_temp_mid(unsigned int amb)
49{
50 return AMB_FUNC_3_OFFSET + AMB_REG_TEMP_MID_ADDR +
51 AMB_CONFIG_SIZE * amb;
52}
53
54static unsigned long amb_reg_temp_max(unsigned int amb)
55{
56 return AMB_FUNC_3_OFFSET + AMB_REG_TEMP_MAX_ADDR +
57 AMB_CONFIG_SIZE * amb;
58}
59
60static unsigned long amb_reg_temp(unsigned int amb)
61{
62 return AMB_FUNC_3_OFFSET + AMB_REG_TEMP_ADDR +
63 AMB_CONFIG_SIZE * amb;
64}
65
66#define MAX_MEM_CHANNELS 4
67#define MAX_AMBS_PER_CHANNEL 16
68#define MAX_AMBS (MAX_MEM_CHANNELS * \
69 MAX_AMBS_PER_CHANNEL)
70#define CHANNEL_SHIFT 4
71#define DIMM_MASK 0xF
72/*
73 * Ugly hack: For some reason the highest bit is set if there
74 * are _any_ DIMMs in the channel. Attempting to read from
75 * this "high-order" AMB results in a memory bus error, so
76 * for now we'll just ignore that top bit, even though that
77 * might prevent us from seeing the 16th DIMM in the channel.
78 */
79#define REAL_MAX_AMBS_PER_CHANNEL 15
80#define KNOBS_PER_AMB 6
81
82static unsigned long amb_num_from_reg(unsigned int byte_num, unsigned int bit)
83{
84 return byte_num * MAX_AMBS_PER_CHANNEL + bit;
85}
86
87#define AMB_SYSFS_NAME_LEN 16
88struct i5k_device_attribute {
89 struct sensor_device_attribute s_attr;
90 char name[AMB_SYSFS_NAME_LEN];
91};
92
93struct i5k_amb_data {
94 struct device *hwmon_dev;
95
96 unsigned long amb_base;
97 unsigned long amb_len;
98 u16 amb_present[MAX_MEM_CHANNELS];
99 void __iomem *amb_mmio;
100 struct i5k_device_attribute *attrs;
101 unsigned int num_attrs;
102};
103
104static DEVICE_STRING_ATTR_RO(name, 0444, DRVNAME);
105
106static struct platform_device *amb_pdev;
107
108static u8 amb_read_byte(struct i5k_amb_data *data, unsigned long offset)
109{
110 return ioread8(data->amb_mmio + offset);
111}
112
113static void amb_write_byte(struct i5k_amb_data *data, unsigned long offset,
114 u8 val)
115{
116 iowrite8(val, data->amb_mmio + offset);
117}
118
119static ssize_t show_amb_alarm(struct device *dev,
120 struct device_attribute *devattr,
121 char *buf)
122{
123 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
124 struct i5k_amb_data *data = dev_get_drvdata(dev);
125
126 if (!(amb_read_byte(data, amb_reg_temp_status(attr->index)) & 0x20) &&
127 (amb_read_byte(data, amb_reg_temp_status(attr->index)) & 0x8))
128 return sprintf(buf, "1\n");
129 else
130 return sprintf(buf, "0\n");
131}
132
133static ssize_t store_amb_min(struct device *dev,
134 struct device_attribute *devattr,
135 const char *buf,
136 size_t count)
137{
138 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
139 struct i5k_amb_data *data = dev_get_drvdata(dev);
140 unsigned long temp;
141 int ret = kstrtoul(buf, 10, &temp);
142 if (ret < 0)
143 return ret;
144
145 temp = temp / 500;
146 if (temp > 255)
147 temp = 255;
148
149 amb_write_byte(data, amb_reg_temp_min(attr->index), temp);
150 return count;
151}
152
153static ssize_t store_amb_mid(struct device *dev,
154 struct device_attribute *devattr,
155 const char *buf,
156 size_t count)
157{
158 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
159 struct i5k_amb_data *data = dev_get_drvdata(dev);
160 unsigned long temp;
161 int ret = kstrtoul(buf, 10, &temp);
162 if (ret < 0)
163 return ret;
164
165 temp = temp / 500;
166 if (temp > 255)
167 temp = 255;
168
169 amb_write_byte(data, amb_reg_temp_mid(attr->index), temp);
170 return count;
171}
172
173static ssize_t store_amb_max(struct device *dev,
174 struct device_attribute *devattr,
175 const char *buf,
176 size_t count)
177{
178 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
179 struct i5k_amb_data *data = dev_get_drvdata(dev);
180 unsigned long temp;
181 int ret = kstrtoul(buf, 10, &temp);
182 if (ret < 0)
183 return ret;
184
185 temp = temp / 500;
186 if (temp > 255)
187 temp = 255;
188
189 amb_write_byte(data, amb_reg_temp_max(attr->index), temp);
190 return count;
191}
192
193static ssize_t show_amb_min(struct device *dev,
194 struct device_attribute *devattr,
195 char *buf)
196{
197 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
198 struct i5k_amb_data *data = dev_get_drvdata(dev);
199 return sprintf(buf, "%d\n",
200 500 * amb_read_byte(data, amb_reg_temp_min(attr->index)));
201}
202
203static ssize_t show_amb_mid(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_mid(attr->index)));
211}
212
213static ssize_t show_amb_max(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_max(attr->index)));
221}
222
223static ssize_t show_amb_temp(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(attr->index)));
231}
232
233static ssize_t show_label(struct device *dev,
234 struct device_attribute *devattr,
235 char *buf)
236{
237 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
238
239 return sprintf(buf, "Ch. %d DIMM %d\n", attr->index >> CHANNEL_SHIFT,
240 attr->index & DIMM_MASK);
241}
242
243static int i5k_amb_hwmon_init(struct platform_device *pdev)
244{
245 int i, j, k, d = 0;
246 u16 c;
247 int res = 0;
248 int num_ambs = 0;
249 struct i5k_amb_data *data = platform_get_drvdata(pdev);
250
251 /* Count the number of AMBs found */
252 /* ignore the high-order bit, see "Ugly hack" comment above */
253 for (i = 0; i < MAX_MEM_CHANNELS; i++)
254 num_ambs += hweight16(data->amb_present[i] & 0x7fff);
255
256 /* Set up sysfs stuff */
257 data->attrs = kzalloc(array3_size(num_ambs, KNOBS_PER_AMB,
258 sizeof(*data->attrs)),
259 GFP_KERNEL);
260 if (!data->attrs)
261 return -ENOMEM;
262 data->num_attrs = 0;
263
264 for (i = 0; i < MAX_MEM_CHANNELS; i++) {
265 c = data->amb_present[i];
266 for (j = 0; j < REAL_MAX_AMBS_PER_CHANNEL; j++, c >>= 1) {
267 struct i5k_device_attribute *iattr;
268
269 k = amb_num_from_reg(i, j);
270 if (!(c & 0x1))
271 continue;
272 d++;
273
274 /* sysfs label */
275 iattr = data->attrs + data->num_attrs;
276 snprintf(iattr->name, AMB_SYSFS_NAME_LEN,
277 "temp%d_label", d);
278 iattr->s_attr.dev_attr.attr.name = iattr->name;
279 iattr->s_attr.dev_attr.attr.mode = 0444;
280 iattr->s_attr.dev_attr.show = show_label;
281 iattr->s_attr.index = k;
282 sysfs_attr_init(&iattr->s_attr.dev_attr.attr);
283 res = device_create_file(&pdev->dev,
284 &iattr->s_attr.dev_attr);
285 if (res)
286 goto exit_remove;
287 data->num_attrs++;
288
289 /* Temperature sysfs knob */
290 iattr = data->attrs + data->num_attrs;
291 snprintf(iattr->name, AMB_SYSFS_NAME_LEN,
292 "temp%d_input", d);
293 iattr->s_attr.dev_attr.attr.name = iattr->name;
294 iattr->s_attr.dev_attr.attr.mode = 0444;
295 iattr->s_attr.dev_attr.show = show_amb_temp;
296 iattr->s_attr.index = k;
297 sysfs_attr_init(&iattr->s_attr.dev_attr.attr);
298 res = device_create_file(&pdev->dev,
299 &iattr->s_attr.dev_attr);
300 if (res)
301 goto exit_remove;
302 data->num_attrs++;
303
304 /* Temperature min sysfs knob */
305 iattr = data->attrs + data->num_attrs;
306 snprintf(iattr->name, AMB_SYSFS_NAME_LEN,
307 "temp%d_min", d);
308 iattr->s_attr.dev_attr.attr.name = iattr->name;
309 iattr->s_attr.dev_attr.attr.mode = 0644;
310 iattr->s_attr.dev_attr.show = show_amb_min;
311 iattr->s_attr.dev_attr.store = store_amb_min;
312 iattr->s_attr.index = k;
313 sysfs_attr_init(&iattr->s_attr.dev_attr.attr);
314 res = device_create_file(&pdev->dev,
315 &iattr->s_attr.dev_attr);
316 if (res)
317 goto exit_remove;
318 data->num_attrs++;
319
320 /* Temperature mid sysfs knob */
321 iattr = data->attrs + data->num_attrs;
322 snprintf(iattr->name, AMB_SYSFS_NAME_LEN,
323 "temp%d_mid", d);
324 iattr->s_attr.dev_attr.attr.name = iattr->name;
325 iattr->s_attr.dev_attr.attr.mode = 0644;
326 iattr->s_attr.dev_attr.show = show_amb_mid;
327 iattr->s_attr.dev_attr.store = store_amb_mid;
328 iattr->s_attr.index = k;
329 sysfs_attr_init(&iattr->s_attr.dev_attr.attr);
330 res = device_create_file(&pdev->dev,
331 &iattr->s_attr.dev_attr);
332 if (res)
333 goto exit_remove;
334 data->num_attrs++;
335
336 /* Temperature max sysfs knob */
337 iattr = data->attrs + data->num_attrs;
338 snprintf(iattr->name, AMB_SYSFS_NAME_LEN,
339 "temp%d_max", d);
340 iattr->s_attr.dev_attr.attr.name = iattr->name;
341 iattr->s_attr.dev_attr.attr.mode = 0644;
342 iattr->s_attr.dev_attr.show = show_amb_max;
343 iattr->s_attr.dev_attr.store = store_amb_max;
344 iattr->s_attr.index = k;
345 sysfs_attr_init(&iattr->s_attr.dev_attr.attr);
346 res = device_create_file(&pdev->dev,
347 &iattr->s_attr.dev_attr);
348 if (res)
349 goto exit_remove;
350 data->num_attrs++;
351
352 /* Temperature alarm sysfs knob */
353 iattr = data->attrs + data->num_attrs;
354 snprintf(iattr->name, AMB_SYSFS_NAME_LEN,
355 "temp%d_alarm", d);
356 iattr->s_attr.dev_attr.attr.name = iattr->name;
357 iattr->s_attr.dev_attr.attr.mode = 0444;
358 iattr->s_attr.dev_attr.show = show_amb_alarm;
359 iattr->s_attr.index = k;
360 sysfs_attr_init(&iattr->s_attr.dev_attr.attr);
361 res = device_create_file(&pdev->dev,
362 &iattr->s_attr.dev_attr);
363 if (res)
364 goto exit_remove;
365 data->num_attrs++;
366 }
367 }
368
369 res = device_create_file(&pdev->dev, &dev_attr_name.attr);
370 if (res)
371 goto exit_remove;
372
373 data->hwmon_dev = hwmon_device_register(&pdev->dev);
374 if (IS_ERR(data->hwmon_dev)) {
375 res = PTR_ERR(data->hwmon_dev);
376 goto exit_remove;
377 }
378
379 return res;
380
381exit_remove:
382 device_remove_file(&pdev->dev, &dev_attr_name.attr);
383 for (i = 0; i < data->num_attrs; i++)
384 device_remove_file(&pdev->dev, &data->attrs[i].s_attr.dev_attr);
385 kfree(data->attrs);
386
387 return res;
388}
389
390static int i5k_amb_add(void)
391{
392 int res;
393
394 /* only ever going to be one of these */
395 amb_pdev = platform_device_alloc(DRVNAME, 0);
396 if (!amb_pdev)
397 return -ENOMEM;
398
399 res = platform_device_add(amb_pdev);
400 if (res)
401 goto err;
402 return 0;
403
404err:
405 platform_device_put(amb_pdev);
406 return res;
407}
408
409static int i5k_find_amb_registers(struct i5k_amb_data *data,
410 unsigned long devid)
411{
412 struct pci_dev *pcidev;
413 u32 val32;
414 int res = -ENODEV;
415
416 /* Find AMB register memory space */
417 pcidev = pci_get_device(PCI_VENDOR_ID_INTEL,
418 devid,
419 NULL);
420 if (!pcidev)
421 return -ENODEV;
422
423 pci_read_config_dword(pcidev, I5K_REG_AMB_BASE_ADDR, &val32);
424 if (val32 == (u32)~0)
425 goto out;
426 data->amb_base = val32;
427
428 pci_read_config_dword(pcidev, I5K_REG_AMB_LEN_ADDR, &val32);
429 if (val32 == (u32)~0)
430 goto out;
431 data->amb_len = val32;
432
433 /* Is it big enough? */
434 if (data->amb_len < AMB_CONFIG_SIZE * MAX_AMBS) {
435 dev_err(&pcidev->dev, "AMB region too small!\n");
436 goto out;
437 }
438
439 res = 0;
440out:
441 pci_dev_put(pcidev);
442 return res;
443}
444
445static int i5k_channel_probe(u16 *amb_present, unsigned long dev_id)
446{
447 struct pci_dev *pcidev;
448 u16 val16;
449 int res = -ENODEV;
450
451 /* Copy the DIMM presence map for these two channels */
452 pcidev = pci_get_device(PCI_VENDOR_ID_INTEL, dev_id, NULL);
453 if (!pcidev)
454 return -ENODEV;
455
456 pci_read_config_word(pcidev, I5K_REG_CHAN0_PRESENCE_ADDR, &val16);
457 if (val16 == (u16)~0)
458 goto out;
459 amb_present[0] = val16;
460
461 pci_read_config_word(pcidev, I5K_REG_CHAN1_PRESENCE_ADDR, &val16);
462 if (val16 == (u16)~0)
463 goto out;
464 amb_present[1] = val16;
465
466 res = 0;
467
468out:
469 pci_dev_put(pcidev);
470 return res;
471}
472
473static struct {
474 unsigned long err;
475 unsigned long fbd0;
476} chipset_ids[] = {
477 { PCI_DEVICE_ID_INTEL_5000_ERR, PCI_DEVICE_ID_INTEL_5000_FBD0 },
478 { PCI_DEVICE_ID_INTEL_5400_ERR, PCI_DEVICE_ID_INTEL_5400_FBD0 },
479 { 0, 0 }
480};
481
482#ifdef MODULE
483static const struct pci_device_id i5k_amb_ids[] = {
484 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_5000_ERR) },
485 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_5400_ERR) },
486 { 0, }
487};
488MODULE_DEVICE_TABLE(pci, i5k_amb_ids);
489#endif
490
491static int i5k_amb_probe(struct platform_device *pdev)
492{
493 struct i5k_amb_data *data;
494 struct resource *reso;
495 int i, res;
496
497 data = kzalloc(sizeof(*data), GFP_KERNEL);
498 if (!data)
499 return -ENOMEM;
500
501 /* Figure out where the AMB registers live */
502 i = 0;
503 do {
504 res = i5k_find_amb_registers(data, chipset_ids[i].err);
505 if (res == 0)
506 break;
507 i++;
508 } while (chipset_ids[i].err);
509
510 if (res)
511 goto err;
512
513 /* Copy the DIMM presence map for the first two channels */
514 res = i5k_channel_probe(&data->amb_present[0], chipset_ids[i].fbd0);
515 if (res)
516 goto err;
517
518 /* Copy the DIMM presence map for the optional second two channels */
519 i5k_channel_probe(&data->amb_present[2], chipset_ids[i].fbd0 + 1);
520
521 /* Set up resource regions */
522 reso = request_mem_region(data->amb_base, data->amb_len, DRVNAME);
523 if (!reso) {
524 res = -EBUSY;
525 goto err;
526 }
527
528 data->amb_mmio = ioremap(data->amb_base, data->amb_len);
529 if (!data->amb_mmio) {
530 res = -EBUSY;
531 goto err_map_failed;
532 }
533
534 platform_set_drvdata(pdev, data);
535
536 res = i5k_amb_hwmon_init(pdev);
537 if (res)
538 goto err_init_failed;
539
540 return res;
541
542err_init_failed:
543 iounmap(data->amb_mmio);
544err_map_failed:
545 release_mem_region(data->amb_base, data->amb_len);
546err:
547 kfree(data);
548 return res;
549}
550
551static void i5k_amb_remove(struct platform_device *pdev)
552{
553 int i;
554 struct i5k_amb_data *data = platform_get_drvdata(pdev);
555
556 hwmon_device_unregister(data->hwmon_dev);
557 device_remove_file(&pdev->dev, &dev_attr_name.attr);
558 for (i = 0; i < data->num_attrs; i++)
559 device_remove_file(&pdev->dev, &data->attrs[i].s_attr.dev_attr);
560 kfree(data->attrs);
561 iounmap(data->amb_mmio);
562 release_mem_region(data->amb_base, data->amb_len);
563 kfree(data);
564}
565
566static struct platform_driver i5k_amb_driver = {
567 .driver = {
568 .name = DRVNAME,
569 },
570 .probe = i5k_amb_probe,
571 .remove = i5k_amb_remove,
572};
573
574static int __init i5k_amb_init(void)
575{
576 int res;
577
578 res = platform_driver_register(&i5k_amb_driver);
579 if (res)
580 return res;
581
582 res = i5k_amb_add();
583 if (res)
584 platform_driver_unregister(&i5k_amb_driver);
585
586 return res;
587}
588
589static void __exit i5k_amb_exit(void)
590{
591 platform_device_unregister(amb_pdev);
592 platform_driver_unregister(&i5k_amb_driver);
593}
594
595MODULE_AUTHOR("Darrick J. Wong <darrick.wong@oracle.com>");
596MODULE_DESCRIPTION("Intel 5000 chipset FB-DIMM AMB temperature sensor");
597MODULE_LICENSE("GPL");
598
599module_init(i5k_amb_init);
600module_exit(i5k_amb_exit);