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12#include <linux/module.h>
13#include <linux/init.h>
14#include <linux/pci.h>
15#include <linux/pci_ids.h>
16#include <linux/edac.h>
17#include "edac_module.h"
18
19#define I82975X_REVISION " Ver: 1.0.0"
20#define EDAC_MOD_STR "i82975x_edac"
21
22#define i82975x_printk(level, fmt, arg...) \
23 edac_printk(level, "i82975x", fmt, ##arg)
24
25#define i82975x_mc_printk(mci, level, fmt, arg...) \
26 edac_mc_chipset_printk(mci, level, "i82975x", fmt, ##arg)
27
28#ifndef PCI_DEVICE_ID_INTEL_82975_0
29#define PCI_DEVICE_ID_INTEL_82975_0 0x277c
30#endif
31
32#define I82975X_NR_DIMMS 8
33#define I82975X_NR_CSROWS(nr_chans) (I82975X_NR_DIMMS / (nr_chans))
34
35
36#define I82975X_EAP 0x58
37
38
39
40
41
42
43#define I82975X_DERRSYN 0x5c
44
45
46
47
48#define I82975X_DES 0x5d
49
50
51
52
53
54#define I82975X_ERRSTS 0xc8
55
56
57
58
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60
61
62
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66
67
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70
71
72#define I82975X_ERRCMD 0xca
73
74
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82
83
84#define I82975X_SMICMD 0xcc
85
86
87
88
89
90
91#define I82975X_SCICMD 0xce
92
93
94
95
96
97
98#define I82975X_XEAP 0xfc
99
100
101
102
103
104#define I82975X_MCHBAR 0x44
105
106
107
108
109
110
111
112
113
114
115#define I82975X_DRB_SHIFT 25
116
117#define I82975X_DRB 0x100
118
119
120
121
122
123
124
125#define I82975X_DRB_CH0R0 0x100
126#define I82975X_DRB_CH0R1 0x101
127#define I82975X_DRB_CH0R2 0x102
128#define I82975X_DRB_CH0R3 0x103
129#define I82975X_DRB_CH1R0 0x180
130#define I82975X_DRB_CH1R1 0x181
131#define I82975X_DRB_CH1R2 0x182
132#define I82975X_DRB_CH1R3 0x183
133
134
135#define I82975X_DRA 0x108
136
137
138
139
140
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142
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147
148
149
150#define I82975X_DRA_CH0R01 0x108
151#define I82975X_DRA_CH0R23 0x109
152#define I82975X_DRA_CH1R01 0x188
153#define I82975X_DRA_CH1R23 0x189
154
155
156#define I82975X_BNKARC 0x10e
157
158
159
160
161
162
163
164
165
166
167#define I82975X_C0BNKARC 0x10e
168#define I82975X_C1BNKARC 0x18e
169
170
171
172#define I82975X_DRC 0x120
173
174
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190
191
192#define I82975X_DRC_CH0M0 0x120
193#define I82975X_DRC_CH1M0 0x1A0
194
195
196#define I82975X_DRC_M1 0x124
197
198
199
200
201
202#define I82975X_DRC_CH0M1 0x124
203#define I82975X_DRC_CH1M1 0x1A4
204
205enum i82975x_chips {
206 I82975X = 0,
207};
208
209struct i82975x_pvt {
210 void __iomem *mch_window;
211};
212
213struct i82975x_dev_info {
214 const char *ctl_name;
215};
216
217struct i82975x_error_info {
218 u16 errsts;
219 u32 eap;
220 u8 des;
221 u8 derrsyn;
222 u16 errsts2;
223 u8 chan;
224 u8 xeap;
225};
226
227static const struct i82975x_dev_info i82975x_devs[] = {
228 [I82975X] = {
229 .ctl_name = "i82975x"
230 },
231};
232
233static struct pci_dev *mci_pdev;
234
235
236
237static int i82975x_registered = 1;
238
239static void i82975x_get_error_info(struct mem_ctl_info *mci,
240 struct i82975x_error_info *info)
241{
242 struct pci_dev *pdev;
243
244 pdev = to_pci_dev(mci->pdev);
245
246
247
248
249
250
251 pci_read_config_word(pdev, I82975X_ERRSTS, &info->errsts);
252 pci_read_config_dword(pdev, I82975X_EAP, &info->eap);
253 pci_read_config_byte(pdev, I82975X_XEAP, &info->xeap);
254 pci_read_config_byte(pdev, I82975X_DES, &info->des);
255 pci_read_config_byte(pdev, I82975X_DERRSYN, &info->derrsyn);
256 pci_read_config_word(pdev, I82975X_ERRSTS, &info->errsts2);
257
258 pci_write_bits16(pdev, I82975X_ERRSTS, 0x0003, 0x0003);
259
260
261
262
263
264
265
266 if (!(info->errsts2 & 0x0003))
267 return;
268
269 if ((info->errsts ^ info->errsts2) & 0x0003) {
270 pci_read_config_dword(pdev, I82975X_EAP, &info->eap);
271 pci_read_config_byte(pdev, I82975X_XEAP, &info->xeap);
272 pci_read_config_byte(pdev, I82975X_DES, &info->des);
273 pci_read_config_byte(pdev, I82975X_DERRSYN,
274 &info->derrsyn);
275 }
276}
277
278static int i82975x_process_error_info(struct mem_ctl_info *mci,
279 struct i82975x_error_info *info, int handle_errors)
280{
281 int row, chan;
282 unsigned long offst, page;
283
284 if (!(info->errsts2 & 0x0003))
285 return 0;
286
287 if (!handle_errors)
288 return 1;
289
290 if ((info->errsts ^ info->errsts2) & 0x0003) {
291 edac_mc_handle_error(HW_EVENT_ERR_UNCORRECTED, mci, 1, 0, 0, 0,
292 -1, -1, -1, "UE overwrote CE", "");
293 info->errsts = info->errsts2;
294 }
295
296 page = (unsigned long) info->eap;
297 page >>= 1;
298 if (info->xeap & 1)
299 page |= 0x80000000;
300 page >>= (PAGE_SHIFT - 1);
301 row = edac_mc_find_csrow_by_page(mci, page);
302
303 if (row == -1) {
304 i82975x_mc_printk(mci, KERN_ERR, "error processing EAP:\n"
305 "\tXEAP=%u\n"
306 "\t EAP=0x%08x\n"
307 "\tPAGE=0x%08x\n",
308 (info->xeap & 1) ? 1 : 0, info->eap, (unsigned int) page);
309 return 0;
310 }
311 chan = (mci->csrows[row]->nr_channels == 1) ? 0 : info->eap & 1;
312 offst = info->eap
313 & ((1 << PAGE_SHIFT) -
314 (1 << mci->csrows[row]->channels[chan]->dimm->grain));
315
316 if (info->errsts & 0x0002)
317 edac_mc_handle_error(HW_EVENT_ERR_UNCORRECTED, mci, 1,
318 page, offst, 0,
319 row, -1, -1,
320 "i82975x UE", "");
321 else
322 edac_mc_handle_error(HW_EVENT_ERR_CORRECTED, mci, 1,
323 page, offst, info->derrsyn,
324 row, chan ? chan : 0, -1,
325 "i82975x CE", "");
326
327 return 1;
328}
329
330static void i82975x_check(struct mem_ctl_info *mci)
331{
332 struct i82975x_error_info info;
333
334 edac_dbg(1, "MC%d\n", mci->mc_idx);
335 i82975x_get_error_info(mci, &info);
336 i82975x_process_error_info(mci, &info, 1);
337}
338
339
340static int dual_channel_active(void __iomem *mch_window)
341{
342
343
344
345
346
347
348
349
350 u8 drb[4][2];
351 int row;
352 int dualch;
353
354 for (dualch = 1, row = 0; dualch && (row < 4); row++) {
355 drb[row][0] = readb(mch_window + I82975X_DRB + row);
356 drb[row][1] = readb(mch_window + I82975X_DRB + row + 0x80);
357 dualch = dualch && (drb[row][0] == drb[row][1]);
358 }
359 return dualch;
360}
361
362static enum dev_type i82975x_dram_type(void __iomem *mch_window, int rank)
363{
364
365
366
367 return DEV_X8;
368}
369
370static void i82975x_init_csrows(struct mem_ctl_info *mci,
371 struct pci_dev *pdev, void __iomem *mch_window)
372{
373 struct csrow_info *csrow;
374 unsigned long last_cumul_size;
375 u8 value;
376 u32 cumul_size, nr_pages;
377 int index, chan;
378 struct dimm_info *dimm;
379 enum dev_type dtype;
380
381 last_cumul_size = 0;
382
383
384
385
386
387
388
389
390
391
392 for (index = 0; index < mci->nr_csrows; index++) {
393 csrow = mci->csrows[index];
394
395 value = readb(mch_window + I82975X_DRB + index +
396 ((index >= 4) ? 0x80 : 0));
397 cumul_size = value;
398 cumul_size <<= (I82975X_DRB_SHIFT - PAGE_SHIFT);
399
400
401
402
403 if (csrow->nr_channels > 1)
404 cumul_size <<= 1;
405 edac_dbg(3, "(%d) cumul_size 0x%x\n", index, cumul_size);
406
407 nr_pages = cumul_size - last_cumul_size;
408 if (!nr_pages)
409 continue;
410
411
412
413
414
415
416
417 dtype = i82975x_dram_type(mch_window, index);
418 for (chan = 0; chan < csrow->nr_channels; chan++) {
419 dimm = mci->csrows[index]->channels[chan]->dimm;
420
421 dimm->nr_pages = nr_pages / csrow->nr_channels;
422
423 snprintf(csrow->channels[chan]->dimm->label, EDAC_MC_LABEL_LEN, "DIMM %c%d",
424 (chan == 0) ? 'A' : 'B',
425 index);
426 dimm->grain = 1 << 7;
427 dimm->dtype = i82975x_dram_type(mch_window, index);
428 dimm->mtype = MEM_DDR2;
429 dimm->edac_mode = EDAC_SECDED;
430 }
431
432 csrow->first_page = last_cumul_size;
433 csrow->last_page = cumul_size - 1;
434 last_cumul_size = cumul_size;
435 }
436}
437
438
439
440#ifdef i82975x_DEBUG_IOMEM
441static void i82975x_print_dram_timings(void __iomem *mch_window)
442{
443
444
445
446
447
448
449 static const int caslats[4] = { 5, 4, 3, 6 };
450 u32 dtreg[2];
451
452 dtreg[0] = readl(mch_window + 0x114);
453 dtreg[1] = readl(mch_window + 0x194);
454 i82975x_printk(KERN_INFO, "DRAM Timings : Ch0 Ch1\n"
455 " RAS Active Min = %d %d\n"
456 " CAS latency = %d %d\n"
457 " RAS to CAS = %d %d\n"
458 " RAS precharge = %d %d\n",
459 (dtreg[0] >> 19 ) & 0x0f,
460 (dtreg[1] >> 19) & 0x0f,
461 caslats[(dtreg[0] >> 8) & 0x03],
462 caslats[(dtreg[1] >> 8) & 0x03],
463 ((dtreg[0] >> 4) & 0x07) + 2,
464 ((dtreg[1] >> 4) & 0x07) + 2,
465 (dtreg[0] & 0x07) + 2,
466 (dtreg[1] & 0x07) + 2
467 );
468
469}
470#endif
471
472static int i82975x_probe1(struct pci_dev *pdev, int dev_idx)
473{
474 int rc = -ENODEV;
475 struct mem_ctl_info *mci;
476 struct edac_mc_layer layers[2];
477 struct i82975x_pvt *pvt;
478 void __iomem *mch_window;
479 u32 mchbar;
480 u32 drc[2];
481 struct i82975x_error_info discard;
482 int chans;
483#ifdef i82975x_DEBUG_IOMEM
484 u8 c0drb[4];
485 u8 c1drb[4];
486#endif
487
488 edac_dbg(0, "\n");
489
490 pci_read_config_dword(pdev, I82975X_MCHBAR, &mchbar);
491 if (!(mchbar & 1)) {
492 edac_dbg(3, "failed, MCHBAR disabled!\n");
493 goto fail0;
494 }
495 mchbar &= 0xffffc000;
496 mch_window = ioremap_nocache(mchbar, 0x1000);
497 if (!mch_window) {
498 edac_dbg(3, "error ioremapping MCHBAR!\n");
499 goto fail0;
500 }
501
502#ifdef i82975x_DEBUG_IOMEM
503 i82975x_printk(KERN_INFO, "MCHBAR real = %0x, remapped = %p\n",
504 mchbar, mch_window);
505
506 c0drb[0] = readb(mch_window + I82975X_DRB_CH0R0);
507 c0drb[1] = readb(mch_window + I82975X_DRB_CH0R1);
508 c0drb[2] = readb(mch_window + I82975X_DRB_CH0R2);
509 c0drb[3] = readb(mch_window + I82975X_DRB_CH0R3);
510 c1drb[0] = readb(mch_window + I82975X_DRB_CH1R0);
511 c1drb[1] = readb(mch_window + I82975X_DRB_CH1R1);
512 c1drb[2] = readb(mch_window + I82975X_DRB_CH1R2);
513 c1drb[3] = readb(mch_window + I82975X_DRB_CH1R3);
514 i82975x_printk(KERN_INFO, "DRBCH0R0 = 0x%02x\n", c0drb[0]);
515 i82975x_printk(KERN_INFO, "DRBCH0R1 = 0x%02x\n", c0drb[1]);
516 i82975x_printk(KERN_INFO, "DRBCH0R2 = 0x%02x\n", c0drb[2]);
517 i82975x_printk(KERN_INFO, "DRBCH0R3 = 0x%02x\n", c0drb[3]);
518 i82975x_printk(KERN_INFO, "DRBCH1R0 = 0x%02x\n", c1drb[0]);
519 i82975x_printk(KERN_INFO, "DRBCH1R1 = 0x%02x\n", c1drb[1]);
520 i82975x_printk(KERN_INFO, "DRBCH1R2 = 0x%02x\n", c1drb[2]);
521 i82975x_printk(KERN_INFO, "DRBCH1R3 = 0x%02x\n", c1drb[3]);
522#endif
523
524 drc[0] = readl(mch_window + I82975X_DRC_CH0M0);
525 drc[1] = readl(mch_window + I82975X_DRC_CH1M0);
526#ifdef i82975x_DEBUG_IOMEM
527 i82975x_printk(KERN_INFO, "DRC_CH0 = %0x, %s\n", drc[0],
528 ((drc[0] >> 21) & 3) == 1 ?
529 "ECC enabled" : "ECC disabled");
530 i82975x_printk(KERN_INFO, "DRC_CH1 = %0x, %s\n", drc[1],
531 ((drc[1] >> 21) & 3) == 1 ?
532 "ECC enabled" : "ECC disabled");
533
534 i82975x_printk(KERN_INFO, "C0 BNKARC = %0x\n",
535 readw(mch_window + I82975X_C0BNKARC));
536 i82975x_printk(KERN_INFO, "C1 BNKARC = %0x\n",
537 readw(mch_window + I82975X_C1BNKARC));
538 i82975x_print_dram_timings(mch_window);
539 goto fail1;
540#endif
541 if (!(((drc[0] >> 21) & 3) == 1 || ((drc[1] >> 21) & 3) == 1)) {
542 i82975x_printk(KERN_INFO, "ECC disabled on both channels.\n");
543 goto fail1;
544 }
545
546 chans = dual_channel_active(mch_window) + 1;
547
548
549 layers[0].type = EDAC_MC_LAYER_CHIP_SELECT;
550 layers[0].size = I82975X_NR_DIMMS;
551 layers[0].is_virt_csrow = true;
552 layers[1].type = EDAC_MC_LAYER_CHANNEL;
553 layers[1].size = I82975X_NR_CSROWS(chans);
554 layers[1].is_virt_csrow = false;
555 mci = edac_mc_alloc(0, ARRAY_SIZE(layers), layers, sizeof(*pvt));
556 if (!mci) {
557 rc = -ENOMEM;
558 goto fail1;
559 }
560
561 edac_dbg(3, "init mci\n");
562 mci->pdev = &pdev->dev;
563 mci->mtype_cap = MEM_FLAG_DDR2;
564 mci->edac_ctl_cap = EDAC_FLAG_NONE | EDAC_FLAG_SECDED;
565 mci->edac_cap = EDAC_FLAG_NONE | EDAC_FLAG_SECDED;
566 mci->mod_name = EDAC_MOD_STR;
567 mci->mod_ver = I82975X_REVISION;
568 mci->ctl_name = i82975x_devs[dev_idx].ctl_name;
569 mci->dev_name = pci_name(pdev);
570 mci->edac_check = i82975x_check;
571 mci->ctl_page_to_phys = NULL;
572 edac_dbg(3, "init pvt\n");
573 pvt = (struct i82975x_pvt *) mci->pvt_info;
574 pvt->mch_window = mch_window;
575 i82975x_init_csrows(mci, pdev, mch_window);
576 mci->scrub_mode = SCRUB_HW_SRC;
577 i82975x_get_error_info(mci, &discard);
578
579
580 if (edac_mc_add_mc(mci)) {
581 edac_dbg(3, "failed edac_mc_add_mc()\n");
582 goto fail2;
583 }
584
585
586 edac_dbg(3, "success\n");
587 return 0;
588
589fail2:
590 edac_mc_free(mci);
591
592fail1:
593 iounmap(mch_window);
594fail0:
595 return rc;
596}
597
598
599static int i82975x_init_one(struct pci_dev *pdev,
600 const struct pci_device_id *ent)
601{
602 int rc;
603
604 edac_dbg(0, "\n");
605
606 if (pci_enable_device(pdev) < 0)
607 return -EIO;
608
609 rc = i82975x_probe1(pdev, ent->driver_data);
610
611 if (mci_pdev == NULL)
612 mci_pdev = pci_dev_get(pdev);
613
614 return rc;
615}
616
617static void i82975x_remove_one(struct pci_dev *pdev)
618{
619 struct mem_ctl_info *mci;
620 struct i82975x_pvt *pvt;
621
622 edac_dbg(0, "\n");
623
624 mci = edac_mc_del_mc(&pdev->dev);
625 if (mci == NULL)
626 return;
627
628 pvt = mci->pvt_info;
629 if (pvt->mch_window)
630 iounmap( pvt->mch_window );
631
632 edac_mc_free(mci);
633}
634
635static const struct pci_device_id i82975x_pci_tbl[] = {
636 {
637 PCI_VEND_DEV(INTEL, 82975_0), PCI_ANY_ID, PCI_ANY_ID, 0, 0,
638 I82975X
639 },
640 {
641 0,
642 }
643};
644
645MODULE_DEVICE_TABLE(pci, i82975x_pci_tbl);
646
647static struct pci_driver i82975x_driver = {
648 .name = EDAC_MOD_STR,
649 .probe = i82975x_init_one,
650 .remove = i82975x_remove_one,
651 .id_table = i82975x_pci_tbl,
652};
653
654static int __init i82975x_init(void)
655{
656 int pci_rc;
657
658 edac_dbg(3, "\n");
659
660
661 opstate_init();
662
663 pci_rc = pci_register_driver(&i82975x_driver);
664 if (pci_rc < 0)
665 goto fail0;
666
667 if (mci_pdev == NULL) {
668 mci_pdev = pci_get_device(PCI_VENDOR_ID_INTEL,
669 PCI_DEVICE_ID_INTEL_82975_0, NULL);
670
671 if (!mci_pdev) {
672 edac_dbg(0, "i82975x pci_get_device fail\n");
673 pci_rc = -ENODEV;
674 goto fail1;
675 }
676
677 pci_rc = i82975x_init_one(mci_pdev, i82975x_pci_tbl);
678
679 if (pci_rc < 0) {
680 edac_dbg(0, "i82975x init fail\n");
681 pci_rc = -ENODEV;
682 goto fail1;
683 }
684 }
685
686 return 0;
687
688fail1:
689 pci_unregister_driver(&i82975x_driver);
690
691fail0:
692 pci_dev_put(mci_pdev);
693 return pci_rc;
694}
695
696static void __exit i82975x_exit(void)
697{
698 edac_dbg(3, "\n");
699
700 pci_unregister_driver(&i82975x_driver);
701
702 if (!i82975x_registered) {
703 i82975x_remove_one(mci_pdev);
704 pci_dev_put(mci_pdev);
705 }
706}
707
708module_init(i82975x_init);
709module_exit(i82975x_exit);
710
711MODULE_LICENSE("GPL");
712MODULE_AUTHOR("Arvind R. <arvino55@gmail.com>");
713MODULE_DESCRIPTION("MC support for Intel 82975 memory hub controllers");
714
715module_param(edac_op_state, int, 0444);
716MODULE_PARM_DESC(edac_op_state, "EDAC Error Reporting state: 0=Poll,1=NMI");
717