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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 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);
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 <darrick.wong@oracle.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/hwmon.h>
25#include <linux/hwmon-sysfs.h>
26#include <linux/err.h>
27#include <linux/mutex.h>
28#include <linux/log2.h>
29#include <linux/pci.h>
30#include <linux/platform_device.h>
31#include <linux/slab.h>
32
33#define DRVNAME "i5k_amb"
34
35#define I5K_REG_AMB_BASE_ADDR 0x48
36#define I5K_REG_AMB_LEN_ADDR 0x50
37#define I5K_REG_CHAN0_PRESENCE_ADDR 0x64
38#define I5K_REG_CHAN1_PRESENCE_ADDR 0x66
39
40#define AMB_REG_TEMP_MIN_ADDR 0x80
41#define AMB_REG_TEMP_MID_ADDR 0x81
42#define AMB_REG_TEMP_MAX_ADDR 0x82
43#define AMB_REG_TEMP_STATUS_ADDR 0x84
44#define AMB_REG_TEMP_ADDR 0x85
45
46#define AMB_CONFIG_SIZE 2048
47#define AMB_FUNC_3_OFFSET 768
48
49static unsigned long amb_reg_temp_status(unsigned int amb)
50{
51 return AMB_FUNC_3_OFFSET + AMB_REG_TEMP_STATUS_ADDR +
52 AMB_CONFIG_SIZE * amb;
53}
54
55static unsigned long amb_reg_temp_min(unsigned int amb)
56{
57 return AMB_FUNC_3_OFFSET + AMB_REG_TEMP_MIN_ADDR +
58 AMB_CONFIG_SIZE * amb;
59}
60
61static unsigned long amb_reg_temp_mid(unsigned int amb)
62{
63 return AMB_FUNC_3_OFFSET + AMB_REG_TEMP_MID_ADDR +
64 AMB_CONFIG_SIZE * amb;
65}
66
67static unsigned long amb_reg_temp_max(unsigned int amb)
68{
69 return AMB_FUNC_3_OFFSET + AMB_REG_TEMP_MAX_ADDR +
70 AMB_CONFIG_SIZE * amb;
71}
72
73static unsigned long amb_reg_temp(unsigned int amb)
74{
75 return AMB_FUNC_3_OFFSET + AMB_REG_TEMP_ADDR +
76 AMB_CONFIG_SIZE * amb;
77}
78
79#define MAX_MEM_CHANNELS 4
80#define MAX_AMBS_PER_CHANNEL 16
81#define MAX_AMBS (MAX_MEM_CHANNELS * \
82 MAX_AMBS_PER_CHANNEL)
83#define CHANNEL_SHIFT 4
84#define DIMM_MASK 0xF
85/*
86 * Ugly hack: For some reason the highest bit is set if there
87 * are _any_ DIMMs in the channel. Attempting to read from
88 * this "high-order" AMB results in a memory bus error, so
89 * for now we'll just ignore that top bit, even though that
90 * might prevent us from seeing the 16th DIMM in the channel.
91 */
92#define REAL_MAX_AMBS_PER_CHANNEL 15
93#define KNOBS_PER_AMB 6
94
95static unsigned long amb_num_from_reg(unsigned int byte_num, unsigned int bit)
96{
97 return byte_num * MAX_AMBS_PER_CHANNEL + bit;
98}
99
100#define AMB_SYSFS_NAME_LEN 16
101struct i5k_device_attribute {
102 struct sensor_device_attribute s_attr;
103 char name[AMB_SYSFS_NAME_LEN];
104};
105
106struct i5k_amb_data {
107 struct device *hwmon_dev;
108
109 unsigned long amb_base;
110 unsigned long amb_len;
111 u16 amb_present[MAX_MEM_CHANNELS];
112 void __iomem *amb_mmio;
113 struct i5k_device_attribute *attrs;
114 unsigned int num_attrs;
115};
116
117static ssize_t name_show(struct device *dev, struct device_attribute *devattr,
118 char *buf)
119{
120 return sprintf(buf, "%s\n", DRVNAME);
121}
122
123
124static DEVICE_ATTR_RO(name);
125
126static struct platform_device *amb_pdev;
127
128static u8 amb_read_byte(struct i5k_amb_data *data, unsigned long offset)
129{
130 return ioread8(data->amb_mmio + offset);
131}
132
133static void amb_write_byte(struct i5k_amb_data *data, unsigned long offset,
134 u8 val)
135{
136 iowrite8(val, data->amb_mmio + offset);
137}
138
139static ssize_t show_amb_alarm(struct device *dev,
140 struct device_attribute *devattr,
141 char *buf)
142{
143 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
144 struct i5k_amb_data *data = dev_get_drvdata(dev);
145
146 if (!(amb_read_byte(data, amb_reg_temp_status(attr->index)) & 0x20) &&
147 (amb_read_byte(data, amb_reg_temp_status(attr->index)) & 0x8))
148 return sprintf(buf, "1\n");
149 else
150 return sprintf(buf, "0\n");
151}
152
153static ssize_t store_amb_min(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_min(attr->index), temp);
170 return count;
171}
172
173static ssize_t store_amb_mid(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_mid(attr->index), temp);
190 return count;
191}
192
193static ssize_t store_amb_max(struct device *dev,
194 struct device_attribute *devattr,
195 const char *buf,
196 size_t count)
197{
198 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
199 struct i5k_amb_data *data = dev_get_drvdata(dev);
200 unsigned long temp;
201 int ret = kstrtoul(buf, 10, &temp);
202 if (ret < 0)
203 return ret;
204
205 temp = temp / 500;
206 if (temp > 255)
207 temp = 255;
208
209 amb_write_byte(data, amb_reg_temp_max(attr->index), temp);
210 return count;
211}
212
213static ssize_t show_amb_min(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_min(attr->index)));
221}
222
223static ssize_t show_amb_mid(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_mid(attr->index)));
231}
232
233static ssize_t show_amb_max(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_max(attr->index)));
241}
242
243static ssize_t show_amb_temp(struct device *dev,
244 struct device_attribute *devattr,
245 char *buf)
246{
247 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
248 struct i5k_amb_data *data = dev_get_drvdata(dev);
249 return sprintf(buf, "%d\n",
250 500 * amb_read_byte(data, amb_reg_temp(attr->index)));
251}
252
253static ssize_t show_label(struct device *dev,
254 struct device_attribute *devattr,
255 char *buf)
256{
257 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
258
259 return sprintf(buf, "Ch. %d DIMM %d\n", attr->index >> CHANNEL_SHIFT,
260 attr->index & DIMM_MASK);
261}
262
263static int i5k_amb_hwmon_init(struct platform_device *pdev)
264{
265 int i, j, k, d = 0;
266 u16 c;
267 int res = 0;
268 int num_ambs = 0;
269 struct i5k_amb_data *data = platform_get_drvdata(pdev);
270
271 /* Count the number of AMBs found */
272 /* ignore the high-order bit, see "Ugly hack" comment above */
273 for (i = 0; i < MAX_MEM_CHANNELS; i++)
274 num_ambs += hweight16(data->amb_present[i] & 0x7fff);
275
276 /* Set up sysfs stuff */
277 data->attrs = kzalloc(sizeof(*data->attrs) * num_ambs * KNOBS_PER_AMB,
278 GFP_KERNEL);
279 if (!data->attrs)
280 return -ENOMEM;
281 data->num_attrs = 0;
282
283 for (i = 0; i < MAX_MEM_CHANNELS; i++) {
284 c = data->amb_present[i];
285 for (j = 0; j < REAL_MAX_AMBS_PER_CHANNEL; j++, c >>= 1) {
286 struct i5k_device_attribute *iattr;
287
288 k = amb_num_from_reg(i, j);
289 if (!(c & 0x1))
290 continue;
291 d++;
292
293 /* sysfs label */
294 iattr = data->attrs + data->num_attrs;
295 snprintf(iattr->name, AMB_SYSFS_NAME_LEN,
296 "temp%d_label", d);
297 iattr->s_attr.dev_attr.attr.name = iattr->name;
298 iattr->s_attr.dev_attr.attr.mode = S_IRUGO;
299 iattr->s_attr.dev_attr.show = show_label;
300 iattr->s_attr.index = k;
301 sysfs_attr_init(&iattr->s_attr.dev_attr.attr);
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 sysfs knob */
309 iattr = data->attrs + data->num_attrs;
310 snprintf(iattr->name, AMB_SYSFS_NAME_LEN,
311 "temp%d_input", 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_temp;
315 iattr->s_attr.index = k;
316 sysfs_attr_init(&iattr->s_attr.dev_attr.attr);
317 res = device_create_file(&pdev->dev,
318 &iattr->s_attr.dev_attr);
319 if (res)
320 goto exit_remove;
321 data->num_attrs++;
322
323 /* Temperature min sysfs knob */
324 iattr = data->attrs + data->num_attrs;
325 snprintf(iattr->name, AMB_SYSFS_NAME_LEN,
326 "temp%d_min", d);
327 iattr->s_attr.dev_attr.attr.name = iattr->name;
328 iattr->s_attr.dev_attr.attr.mode = S_IWUSR | S_IRUGO;
329 iattr->s_attr.dev_attr.show = show_amb_min;
330 iattr->s_attr.dev_attr.store = store_amb_min;
331 iattr->s_attr.index = k;
332 sysfs_attr_init(&iattr->s_attr.dev_attr.attr);
333 res = device_create_file(&pdev->dev,
334 &iattr->s_attr.dev_attr);
335 if (res)
336 goto exit_remove;
337 data->num_attrs++;
338
339 /* Temperature mid sysfs knob */
340 iattr = data->attrs + data->num_attrs;
341 snprintf(iattr->name, AMB_SYSFS_NAME_LEN,
342 "temp%d_mid", d);
343 iattr->s_attr.dev_attr.attr.name = iattr->name;
344 iattr->s_attr.dev_attr.attr.mode = S_IWUSR | S_IRUGO;
345 iattr->s_attr.dev_attr.show = show_amb_mid;
346 iattr->s_attr.dev_attr.store = store_amb_mid;
347 iattr->s_attr.index = k;
348 sysfs_attr_init(&iattr->s_attr.dev_attr.attr);
349 res = device_create_file(&pdev->dev,
350 &iattr->s_attr.dev_attr);
351 if (res)
352 goto exit_remove;
353 data->num_attrs++;
354
355 /* Temperature max sysfs knob */
356 iattr = data->attrs + data->num_attrs;
357 snprintf(iattr->name, AMB_SYSFS_NAME_LEN,
358 "temp%d_max", d);
359 iattr->s_attr.dev_attr.attr.name = iattr->name;
360 iattr->s_attr.dev_attr.attr.mode = S_IWUSR | S_IRUGO;
361 iattr->s_attr.dev_attr.show = show_amb_max;
362 iattr->s_attr.dev_attr.store = store_amb_max;
363 iattr->s_attr.index = k;
364 sysfs_attr_init(&iattr->s_attr.dev_attr.attr);
365 res = device_create_file(&pdev->dev,
366 &iattr->s_attr.dev_attr);
367 if (res)
368 goto exit_remove;
369 data->num_attrs++;
370
371 /* Temperature alarm sysfs knob */
372 iattr = data->attrs + data->num_attrs;
373 snprintf(iattr->name, AMB_SYSFS_NAME_LEN,
374 "temp%d_alarm", d);
375 iattr->s_attr.dev_attr.attr.name = iattr->name;
376 iattr->s_attr.dev_attr.attr.mode = S_IRUGO;
377 iattr->s_attr.dev_attr.show = show_amb_alarm;
378 iattr->s_attr.index = k;
379 sysfs_attr_init(&iattr->s_attr.dev_attr.attr);
380 res = device_create_file(&pdev->dev,
381 &iattr->s_attr.dev_attr);
382 if (res)
383 goto exit_remove;
384 data->num_attrs++;
385 }
386 }
387
388 res = device_create_file(&pdev->dev, &dev_attr_name);
389 if (res)
390 goto exit_remove;
391
392 data->hwmon_dev = hwmon_device_register(&pdev->dev);
393 if (IS_ERR(data->hwmon_dev)) {
394 res = PTR_ERR(data->hwmon_dev);
395 goto exit_remove;
396 }
397
398 return res;
399
400exit_remove:
401 device_remove_file(&pdev->dev, &dev_attr_name);
402 for (i = 0; i < data->num_attrs; i++)
403 device_remove_file(&pdev->dev, &data->attrs[i].s_attr.dev_attr);
404 kfree(data->attrs);
405
406 return res;
407}
408
409static int i5k_amb_add(void)
410{
411 int res = -ENODEV;
412
413 /* only ever going to be one of these */
414 amb_pdev = platform_device_alloc(DRVNAME, 0);
415 if (!amb_pdev)
416 return -ENOMEM;
417
418 res = platform_device_add(amb_pdev);
419 if (res)
420 goto err;
421 return 0;
422
423err:
424 platform_device_put(amb_pdev);
425 return res;
426}
427
428static int i5k_find_amb_registers(struct i5k_amb_data *data,
429 unsigned long devid)
430{
431 struct pci_dev *pcidev;
432 u32 val32;
433 int res = -ENODEV;
434
435 /* Find AMB register memory space */
436 pcidev = pci_get_device(PCI_VENDOR_ID_INTEL,
437 devid,
438 NULL);
439 if (!pcidev)
440 return -ENODEV;
441
442 if (pci_read_config_dword(pcidev, I5K_REG_AMB_BASE_ADDR, &val32))
443 goto out;
444 data->amb_base = val32;
445
446 if (pci_read_config_dword(pcidev, I5K_REG_AMB_LEN_ADDR, &val32))
447 goto out;
448 data->amb_len = val32;
449
450 /* Is it big enough? */
451 if (data->amb_len < AMB_CONFIG_SIZE * MAX_AMBS) {
452 dev_err(&pcidev->dev, "AMB region too small!\n");
453 goto out;
454 }
455
456 res = 0;
457out:
458 pci_dev_put(pcidev);
459 return res;
460}
461
462static int i5k_channel_probe(u16 *amb_present, unsigned long dev_id)
463{
464 struct pci_dev *pcidev;
465 u16 val16;
466 int res = -ENODEV;
467
468 /* Copy the DIMM presence map for these two channels */
469 pcidev = pci_get_device(PCI_VENDOR_ID_INTEL, dev_id, NULL);
470 if (!pcidev)
471 return -ENODEV;
472
473 if (pci_read_config_word(pcidev, I5K_REG_CHAN0_PRESENCE_ADDR, &val16))
474 goto out;
475 amb_present[0] = val16;
476
477 if (pci_read_config_word(pcidev, I5K_REG_CHAN1_PRESENCE_ADDR, &val16))
478 goto out;
479 amb_present[1] = val16;
480
481 res = 0;
482
483out:
484 pci_dev_put(pcidev);
485 return res;
486}
487
488static struct {
489 unsigned long err;
490 unsigned long fbd0;
491} chipset_ids[] = {
492 { PCI_DEVICE_ID_INTEL_5000_ERR, PCI_DEVICE_ID_INTEL_5000_FBD0 },
493 { PCI_DEVICE_ID_INTEL_5400_ERR, PCI_DEVICE_ID_INTEL_5400_FBD0 },
494 { 0, 0 }
495};
496
497#ifdef MODULE
498static const struct pci_device_id i5k_amb_ids[] = {
499 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_5000_ERR) },
500 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_5400_ERR) },
501 { 0, }
502};
503MODULE_DEVICE_TABLE(pci, i5k_amb_ids);
504#endif
505
506static int i5k_amb_probe(struct platform_device *pdev)
507{
508 struct i5k_amb_data *data;
509 struct resource *reso;
510 int i, res;
511
512 data = kzalloc(sizeof(*data), GFP_KERNEL);
513 if (!data)
514 return -ENOMEM;
515
516 /* Figure out where the AMB registers live */
517 i = 0;
518 do {
519 res = i5k_find_amb_registers(data, chipset_ids[i].err);
520 if (res == 0)
521 break;
522 i++;
523 } while (chipset_ids[i].err);
524
525 if (res)
526 goto err;
527
528 /* Copy the DIMM presence map for the first two channels */
529 res = i5k_channel_probe(&data->amb_present[0], chipset_ids[i].fbd0);
530 if (res)
531 goto err;
532
533 /* Copy the DIMM presence map for the optional second two channels */
534 i5k_channel_probe(&data->amb_present[2], chipset_ids[i].fbd0 + 1);
535
536 /* Set up resource regions */
537 reso = request_mem_region(data->amb_base, data->amb_len, DRVNAME);
538 if (!reso) {
539 res = -EBUSY;
540 goto err;
541 }
542
543 data->amb_mmio = ioremap_nocache(data->amb_base, data->amb_len);
544 if (!data->amb_mmio) {
545 res = -EBUSY;
546 goto err_map_failed;
547 }
548
549 platform_set_drvdata(pdev, data);
550
551 res = i5k_amb_hwmon_init(pdev);
552 if (res)
553 goto err_init_failed;
554
555 return res;
556
557err_init_failed:
558 iounmap(data->amb_mmio);
559err_map_failed:
560 release_mem_region(data->amb_base, data->amb_len);
561err:
562 kfree(data);
563 return res;
564}
565
566static int i5k_amb_remove(struct platform_device *pdev)
567{
568 int i;
569 struct i5k_amb_data *data = platform_get_drvdata(pdev);
570
571 hwmon_device_unregister(data->hwmon_dev);
572 device_remove_file(&pdev->dev, &dev_attr_name);
573 for (i = 0; i < data->num_attrs; i++)
574 device_remove_file(&pdev->dev, &data->attrs[i].s_attr.dev_attr);
575 kfree(data->attrs);
576 iounmap(data->amb_mmio);
577 release_mem_region(data->amb_base, data->amb_len);
578 kfree(data);
579 return 0;
580}
581
582static struct platform_driver i5k_amb_driver = {
583 .driver = {
584 .name = DRVNAME,
585 },
586 .probe = i5k_amb_probe,
587 .remove = i5k_amb_remove,
588};
589
590static int __init i5k_amb_init(void)
591{
592 int res;
593
594 res = platform_driver_register(&i5k_amb_driver);
595 if (res)
596 return res;
597
598 res = i5k_amb_add();
599 if (res)
600 platform_driver_unregister(&i5k_amb_driver);
601
602 return res;
603}
604
605static void __exit i5k_amb_exit(void)
606{
607 platform_device_unregister(amb_pdev);
608 platform_driver_unregister(&i5k_amb_driver);
609}
610
611MODULE_AUTHOR("Darrick J. Wong <darrick.wong@oracle.com>");
612MODULE_DESCRIPTION("Intel 5000 chipset FB-DIMM AMB temperature sensor");
613MODULE_LICENSE("GPL");
614
615module_init(i5k_amb_init);
616module_exit(i5k_amb_exit);