1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
|
/*
Copyright (c) 1998 - 2002 Frodo Looijaard <frodol@dds.nl> and
Philip Edelbrock <phil@netroedge.com>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
*/
/*
Supports:
Intel PIIX4, 440MX
Serverworks OSB4, CSB5, CSB6, HT-1000, HT-1100
ATI IXP200, IXP300, IXP400, SB600, SB700/SP5100, SB800
AMD Hudson-2, ML, CZ
SMSC Victory66
Note: we assume there can only be one device, with one or more
SMBus interfaces.
The device can register multiple i2c_adapters (up to PIIX4_MAX_ADAPTERS).
For devices supporting multiple ports the i2c_adapter should provide
an i2c_algorithm to access them.
*/
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/pci.h>
#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/stddef.h>
#include <linux/ioport.h>
#include <linux/i2c.h>
#include <linux/slab.h>
#include <linux/dmi.h>
#include <linux/acpi.h>
#include <linux/io.h>
#include <linux/mutex.h>
/* PIIX4 SMBus address offsets */
#define SMBHSTSTS (0 + piix4_smba)
#define SMBHSLVSTS (1 + piix4_smba)
#define SMBHSTCNT (2 + piix4_smba)
#define SMBHSTCMD (3 + piix4_smba)
#define SMBHSTADD (4 + piix4_smba)
#define SMBHSTDAT0 (5 + piix4_smba)
#define SMBHSTDAT1 (6 + piix4_smba)
#define SMBBLKDAT (7 + piix4_smba)
#define SMBSLVCNT (8 + piix4_smba)
#define SMBSHDWCMD (9 + piix4_smba)
#define SMBSLVEVT (0xA + piix4_smba)
#define SMBSLVDAT (0xC + piix4_smba)
/* count for request_region */
#define SMBIOSIZE 9
/* PCI Address Constants */
#define SMBBA 0x090
#define SMBHSTCFG 0x0D2
#define SMBSLVC 0x0D3
#define SMBSHDW1 0x0D4
#define SMBSHDW2 0x0D5
#define SMBREV 0x0D6
/* Other settings */
#define MAX_TIMEOUT 500
#define ENABLE_INT9 0
/* PIIX4 constants */
#define PIIX4_QUICK 0x00
#define PIIX4_BYTE 0x04
#define PIIX4_BYTE_DATA 0x08
#define PIIX4_WORD_DATA 0x0C
#define PIIX4_BLOCK_DATA 0x14
/* Multi-port constants */
#define PIIX4_MAX_ADAPTERS 4
/* SB800 constants */
#define SB800_PIIX4_SMB_IDX 0xcd6
/*
* SB800 port is selected by bits 2:1 of the smb_en register (0x2c)
* or the smb_sel register (0x2e), depending on bit 0 of register 0x2f.
* Hudson-2/Bolton port is always selected by bits 2:1 of register 0x2f.
*/
#define SB800_PIIX4_PORT_IDX 0x2c
#define SB800_PIIX4_PORT_IDX_ALT 0x2e
#define SB800_PIIX4_PORT_IDX_SEL 0x2f
#define SB800_PIIX4_PORT_IDX_MASK 0x06
/* insmod parameters */
/* If force is set to anything different from 0, we forcibly enable the
PIIX4. DANGEROUS! */
static int force;
module_param (force, int, 0);
MODULE_PARM_DESC(force, "Forcibly enable the PIIX4. DANGEROUS!");
/* If force_addr is set to anything different from 0, we forcibly enable
the PIIX4 at the given address. VERY DANGEROUS! */
static int force_addr;
module_param (force_addr, int, 0);
MODULE_PARM_DESC(force_addr,
"Forcibly enable the PIIX4 at the given address. "
"EXTREMELY DANGEROUS!");
static int srvrworks_csb5_delay;
static struct pci_driver piix4_driver;
static const struct dmi_system_id piix4_dmi_blacklist[] = {
{
.ident = "Sapphire AM2RD790",
.matches = {
DMI_MATCH(DMI_BOARD_VENDOR, "SAPPHIRE Inc."),
DMI_MATCH(DMI_BOARD_NAME, "PC-AM2RD790"),
},
},
{
.ident = "DFI Lanparty UT 790FX",
.matches = {
DMI_MATCH(DMI_BOARD_VENDOR, "DFI Inc."),
DMI_MATCH(DMI_BOARD_NAME, "LP UT 790FX"),
},
},
{ }
};
/* The IBM entry is in a separate table because we only check it
on Intel-based systems */
static const struct dmi_system_id piix4_dmi_ibm[] = {
{
.ident = "IBM",
.matches = { DMI_MATCH(DMI_SYS_VENDOR, "IBM"), },
},
{ },
};
/*
* SB800 globals
* piix4_mutex_sb800 protects piix4_port_sel_sb800 and the pair
* of I/O ports at SB800_PIIX4_SMB_IDX.
*/
static DEFINE_MUTEX(piix4_mutex_sb800);
static u8 piix4_port_sel_sb800;
static const char *piix4_main_port_names_sb800[PIIX4_MAX_ADAPTERS] = {
" port 0", " port 2", " port 3", " port 4"
};
static const char *piix4_aux_port_name_sb800 = " port 1";
struct i2c_piix4_adapdata {
unsigned short smba;
/* SB800 */
bool sb800_main;
u8 port; /* Port number, shifted */
};
static int piix4_setup(struct pci_dev *PIIX4_dev,
const struct pci_device_id *id)
{
unsigned char temp;
unsigned short piix4_smba;
if ((PIIX4_dev->vendor == PCI_VENDOR_ID_SERVERWORKS) &&
(PIIX4_dev->device == PCI_DEVICE_ID_SERVERWORKS_CSB5))
srvrworks_csb5_delay = 1;
/* On some motherboards, it was reported that accessing the SMBus
caused severe hardware problems */
if (dmi_check_system(piix4_dmi_blacklist)) {
dev_err(&PIIX4_dev->dev,
"Accessing the SMBus on this system is unsafe!\n");
return -EPERM;
}
/* Don't access SMBus on IBM systems which get corrupted eeproms */
if (dmi_check_system(piix4_dmi_ibm) &&
PIIX4_dev->vendor == PCI_VENDOR_ID_INTEL) {
dev_err(&PIIX4_dev->dev, "IBM system detected; this module "
"may corrupt your serial eeprom! Refusing to load "
"module!\n");
return -EPERM;
}
/* Determine the address of the SMBus areas */
if (force_addr) {
piix4_smba = force_addr & 0xfff0;
force = 0;
} else {
pci_read_config_word(PIIX4_dev, SMBBA, &piix4_smba);
piix4_smba &= 0xfff0;
if(piix4_smba == 0) {
dev_err(&PIIX4_dev->dev, "SMBus base address "
"uninitialized - upgrade BIOS or use "
"force_addr=0xaddr\n");
return -ENODEV;
}
}
if (acpi_check_region(piix4_smba, SMBIOSIZE, piix4_driver.name))
return -ENODEV;
if (!request_region(piix4_smba, SMBIOSIZE, piix4_driver.name)) {
dev_err(&PIIX4_dev->dev, "SMBus region 0x%x already in use!\n",
piix4_smba);
return -EBUSY;
}
pci_read_config_byte(PIIX4_dev, SMBHSTCFG, &temp);
/* If force_addr is set, we program the new address here. Just to make
sure, we disable the PIIX4 first. */
if (force_addr) {
pci_write_config_byte(PIIX4_dev, SMBHSTCFG, temp & 0xfe);
pci_write_config_word(PIIX4_dev, SMBBA, piix4_smba);
pci_write_config_byte(PIIX4_dev, SMBHSTCFG, temp | 0x01);
dev_info(&PIIX4_dev->dev, "WARNING: SMBus interface set to "
"new address %04x!\n", piix4_smba);
} else if ((temp & 1) == 0) {
if (force) {
/* This should never need to be done, but has been
* noted that many Dell machines have the SMBus
* interface on the PIIX4 disabled!? NOTE: This assumes
* I/O space and other allocations WERE done by the
* Bios! Don't complain if your hardware does weird
* things after enabling this. :') Check for Bios
* updates before resorting to this.
*/
pci_write_config_byte(PIIX4_dev, SMBHSTCFG,
|