forked from torvalds/linux
-
Notifications
You must be signed in to change notification settings - Fork 0
/
Copy path53c700.c
2178 lines (1917 loc) · 69.4 KB
/
53c700.c
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
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
/* -*- mode: c; c-basic-offset: 8 -*- */
/* NCR (or Symbios) 53c700 and 53c700-66 Driver
*
* Copyright (C) 2001 by [email protected]
**-----------------------------------------------------------------------------
**
** 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.
**
** You should have received a copy of the GNU General Public License
** along with this program; if not, write to the Free Software
** Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
**
**-----------------------------------------------------------------------------
*/
/* Notes:
*
* This driver is designed exclusively for these chips (virtually the
* earliest of the scripts engine chips). They need their own drivers
* because they are missing so many of the scripts and snazzy register
* features of their elder brothers (the 710, 720 and 770).
*
* The 700 is the lowliest of the line, it can only do async SCSI.
* The 700-66 can at least do synchronous SCSI up to 10MHz.
*
* The 700 chip has no host bus interface logic of its own. However,
* it is usually mapped to a location with well defined register
* offsets. Therefore, if you can determine the base address and the
* irq your board incorporating this chip uses, you can probably use
* this driver to run it (although you'll probably have to write a
* minimal wrapper for the purpose---see the NCR_D700 driver for
* details about how to do this).
*
*
* TODO List:
*
* 1. Better statistics in the proc fs
*
* 2. Implement message queue (queues SCSI messages like commands) and make
* the abort and device reset functions use them.
* */
/* CHANGELOG
*
* Version 2.8
*
* Fixed bad bug affecting tag starvation processing (previously the
* driver would hang the system if too many tags starved. Also fixed
* bad bug having to do with 10 byte command processing and REQUEST
* SENSE (the command would loop forever getting a transfer length
* mismatch in the CMD phase).
*
* Version 2.7
*
* Fixed scripts problem which caused certain devices (notably CDRWs)
* to hang on initial INQUIRY. Updated NCR_700_readl/writel to use
* __raw_readl/writel for parisc compatibility (Thomas
* Bogendoerfer). Added missing SCp->request_bufflen initialisation
* for sense requests (Ryan Bradetich).
*
* Version 2.6
*
* Following test of the 64 bit parisc kernel by Richard Hirst,
* several problems have now been corrected. Also adds support for
* consistent memory allocation.
*
* Version 2.5
*
* More Compatibility changes for 710 (now actually works). Enhanced
* support for odd clock speeds which constrain SDTR negotiations.
* correct cacheline separation for scsi messages and status for
* incoherent architectures. Use of the pci mapping functions on
* buffers to begin support for 64 bit drivers.
*
* Version 2.4
*
* Added support for the 53c710 chip (in 53c700 emulation mode only---no
* special 53c710 instructions or registers are used).
*
* Version 2.3
*
* More endianness/cache coherency changes.
*
* Better bad device handling (handles devices lying about tag
* queueing support and devices which fail to provide sense data on
* contingent allegiance conditions)
*
* Many thanks to Richard Hirst <[email protected]> for patiently
* debugging this driver on the parisc architecture and suggesting
* many improvements and bug fixes.
*
* Thanks also go to Linuxcare Inc. for providing several PARISC
* machines for me to debug the driver on.
*
* Version 2.2
*
* Made the driver mem or io mapped; added endian invariance; added
* dma cache flushing operations for architectures which need it;
* added support for more varied clocking speeds.
*
* Version 2.1
*
* Initial modularisation from the D700. See NCR_D700.c for the rest of
* the changelog.
* */
#define NCR_700_VERSION "2.8"
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/string.h>
#include <linux/slab.h>
#include <linux/ioport.h>
#include <linux/delay.h>
#include <linux/spinlock.h>
#include <linux/completion.h>
#include <linux/init.h>
#include <linux/proc_fs.h>
#include <linux/blkdev.h>
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/device.h>
#include <asm/dma.h>
#include <asm/system.h>
#include <asm/io.h>
#include <asm/pgtable.h>
#include <asm/byteorder.h>
#include <scsi/scsi.h>
#include <scsi/scsi_cmnd.h>
#include <scsi/scsi_dbg.h>
#include <scsi/scsi_eh.h>
#include <scsi/scsi_host.h>
#include <scsi/scsi_tcq.h>
#include <scsi/scsi_transport.h>
#include <scsi/scsi_transport_spi.h>
#include "53c700.h"
/* NOTE: For 64 bit drivers there are points in the code where we use
* a non dereferenceable pointer to point to a structure in dma-able
* memory (which is 32 bits) so that we can use all of the structure
* operations but take the address at the end. This macro allows us
* to truncate the 64 bit pointer down to 32 bits without the compiler
* complaining */
#define to32bit(x) ((__u32)((unsigned long)(x)))
#ifdef NCR_700_DEBUG
#define STATIC
#else
#define STATIC static
#endif
MODULE_AUTHOR("James Bottomley");
MODULE_DESCRIPTION("53c700 and 53c700-66 Driver");
MODULE_LICENSE("GPL");
/* This is the script */
#include "53c700_d.h"
STATIC int NCR_700_queuecommand(struct Scsi_Host *h, struct scsi_cmnd *);
STATIC int NCR_700_abort(struct scsi_cmnd * SCpnt);
STATIC int NCR_700_bus_reset(struct scsi_cmnd * SCpnt);
STATIC int NCR_700_host_reset(struct scsi_cmnd * SCpnt);
STATIC void NCR_700_chip_setup(struct Scsi_Host *host);
STATIC void NCR_700_chip_reset(struct Scsi_Host *host);
STATIC int NCR_700_slave_alloc(struct scsi_device *SDpnt);
STATIC int NCR_700_slave_configure(struct scsi_device *SDpnt);
STATIC void NCR_700_slave_destroy(struct scsi_device *SDpnt);
static int NCR_700_change_queue_depth(struct scsi_device *SDpnt, int depth, int reason);
static int NCR_700_change_queue_type(struct scsi_device *SDpnt, int depth);
STATIC struct device_attribute *NCR_700_dev_attrs[];
STATIC struct scsi_transport_template *NCR_700_transport_template = NULL;
static char *NCR_700_phase[] = {
"",
"after selection",
"before command phase",
"after command phase",
"after status phase",
"after data in phase",
"after data out phase",
"during data phase",
};
static char *NCR_700_condition[] = {
"",
"NOT MSG_OUT",
"UNEXPECTED PHASE",
"NOT MSG_IN",
"UNEXPECTED MSG",
"MSG_IN",
"SDTR_MSG RECEIVED",
"REJECT_MSG RECEIVED",
"DISCONNECT_MSG RECEIVED",
"MSG_OUT",
"DATA_IN",
};
static char *NCR_700_fatal_messages[] = {
"unexpected message after reselection",
"still MSG_OUT after message injection",
"not MSG_IN after selection",
"Illegal message length received",
};
static char *NCR_700_SBCL_bits[] = {
"IO ",
"CD ",
"MSG ",
"ATN ",
"SEL ",
"BSY ",
"ACK ",
"REQ ",
};
static char *NCR_700_SBCL_to_phase[] = {
"DATA_OUT",
"DATA_IN",
"CMD_OUT",
"STATE",
"ILLEGAL PHASE",
"ILLEGAL PHASE",
"MSG OUT",
"MSG IN",
};
/* This translates the SDTR message offset and period to a value
* which can be loaded into the SXFER_REG.
*
* NOTE: According to SCSI-2, the true transfer period (in ns) is
* actually four times this period value */
static inline __u8
NCR_700_offset_period_to_sxfer(struct NCR_700_Host_Parameters *hostdata,
__u8 offset, __u8 period)
{
int XFERP;
__u8 min_xferp = (hostdata->chip710
? NCR_710_MIN_XFERP : NCR_700_MIN_XFERP);
__u8 max_offset = (hostdata->chip710
? NCR_710_MAX_OFFSET : NCR_700_MAX_OFFSET);
if(offset == 0)
return 0;
if(period < hostdata->min_period) {
printk(KERN_WARNING "53c700: Period %dns is less than this chip's minimum, setting to %d\n", period*4, NCR_700_MIN_PERIOD*4);
period = hostdata->min_period;
}
XFERP = (period*4 * hostdata->sync_clock)/1000 - 4;
if(offset > max_offset) {
printk(KERN_WARNING "53c700: Offset %d exceeds chip maximum, setting to %d\n",
offset, max_offset);
offset = max_offset;
}
if(XFERP < min_xferp) {
XFERP = min_xferp;
}
return (offset & 0x0f) | (XFERP & 0x07)<<4;
}
static inline __u8
NCR_700_get_SXFER(struct scsi_device *SDp)
{
struct NCR_700_Host_Parameters *hostdata =
(struct NCR_700_Host_Parameters *)SDp->host->hostdata[0];
return NCR_700_offset_period_to_sxfer(hostdata,
spi_offset(SDp->sdev_target),
spi_period(SDp->sdev_target));
}
struct Scsi_Host *
NCR_700_detect(struct scsi_host_template *tpnt,
struct NCR_700_Host_Parameters *hostdata, struct device *dev)
{
dma_addr_t pScript, pSlots;
__u8 *memory;
__u32 *script;
struct Scsi_Host *host;
static int banner = 0;
int j;
if(tpnt->sdev_attrs == NULL)
tpnt->sdev_attrs = NCR_700_dev_attrs;
memory = dma_alloc_noncoherent(hostdata->dev, TOTAL_MEM_SIZE,
&pScript, GFP_KERNEL);
if(memory == NULL) {
printk(KERN_ERR "53c700: Failed to allocate memory for driver, detatching\n");
return NULL;
}
script = (__u32 *)memory;
hostdata->msgin = memory + MSGIN_OFFSET;
hostdata->msgout = memory + MSGOUT_OFFSET;
hostdata->status = memory + STATUS_OFFSET;
hostdata->slots = (struct NCR_700_command_slot *)(memory + SLOTS_OFFSET);
hostdata->dev = dev;
pSlots = pScript + SLOTS_OFFSET;
/* Fill in the missing routines from the host template */
tpnt->queuecommand = NCR_700_queuecommand;
tpnt->eh_abort_handler = NCR_700_abort;
tpnt->eh_bus_reset_handler = NCR_700_bus_reset;
tpnt->eh_host_reset_handler = NCR_700_host_reset;
tpnt->can_queue = NCR_700_COMMAND_SLOTS_PER_HOST;
tpnt->sg_tablesize = NCR_700_SG_SEGMENTS;
tpnt->cmd_per_lun = NCR_700_CMD_PER_LUN;
tpnt->use_clustering = ENABLE_CLUSTERING;
tpnt->slave_configure = NCR_700_slave_configure;
tpnt->slave_destroy = NCR_700_slave_destroy;
tpnt->slave_alloc = NCR_700_slave_alloc;
tpnt->change_queue_depth = NCR_700_change_queue_depth;
tpnt->change_queue_type = NCR_700_change_queue_type;
if(tpnt->name == NULL)
tpnt->name = "53c700";
if(tpnt->proc_name == NULL)
tpnt->proc_name = "53c700";
host = scsi_host_alloc(tpnt, 4);
if (!host)
return NULL;
memset(hostdata->slots, 0, sizeof(struct NCR_700_command_slot)
* NCR_700_COMMAND_SLOTS_PER_HOST);
for (j = 0; j < NCR_700_COMMAND_SLOTS_PER_HOST; j++) {
dma_addr_t offset = (dma_addr_t)((unsigned long)&hostdata->slots[j].SG[0]
- (unsigned long)&hostdata->slots[0].SG[0]);
hostdata->slots[j].pSG = (struct NCR_700_SG_List *)((unsigned long)(pSlots + offset));
if(j == 0)
hostdata->free_list = &hostdata->slots[j];
else
hostdata->slots[j-1].ITL_forw = &hostdata->slots[j];
hostdata->slots[j].state = NCR_700_SLOT_FREE;
}
for (j = 0; j < ARRAY_SIZE(SCRIPT); j++)
script[j] = bS_to_host(SCRIPT[j]);
/* adjust all labels to be bus physical */
for (j = 0; j < PATCHES; j++)
script[LABELPATCHES[j]] = bS_to_host(pScript + SCRIPT[LABELPATCHES[j]]);
/* now patch up fixed addresses. */
script_patch_32(hostdata->dev, script, MessageLocation,
pScript + MSGOUT_OFFSET);
script_patch_32(hostdata->dev, script, StatusAddress,
pScript + STATUS_OFFSET);
script_patch_32(hostdata->dev, script, ReceiveMsgAddress,
pScript + MSGIN_OFFSET);
hostdata->script = script;
hostdata->pScript = pScript;
dma_sync_single_for_device(hostdata->dev, pScript, sizeof(SCRIPT), DMA_TO_DEVICE);
hostdata->state = NCR_700_HOST_FREE;
hostdata->cmd = NULL;
host->max_id = 8;
host->max_lun = NCR_700_MAX_LUNS;
BUG_ON(NCR_700_transport_template == NULL);
host->transportt = NCR_700_transport_template;
host->unique_id = (unsigned long)hostdata->base;
hostdata->eh_complete = NULL;
host->hostdata[0] = (unsigned long)hostdata;
/* kick the chip */
NCR_700_writeb(0xff, host, CTEST9_REG);
if (hostdata->chip710)
hostdata->rev = (NCR_700_readb(host, CTEST8_REG)>>4) & 0x0f;
else
hostdata->rev = (NCR_700_readb(host, CTEST7_REG)>>4) & 0x0f;
hostdata->fast = (NCR_700_readb(host, CTEST9_REG) == 0);
if (banner == 0) {
printk(KERN_NOTICE "53c700: Version " NCR_700_VERSION " By [email protected]\n");
banner = 1;
}
printk(KERN_NOTICE "scsi%d: %s rev %d %s\n", host->host_no,
hostdata->chip710 ? "53c710" :
(hostdata->fast ? "53c700-66" : "53c700"),
hostdata->rev, hostdata->differential ?
"(Differential)" : "");
/* reset the chip */
NCR_700_chip_reset(host);
if (scsi_add_host(host, dev)) {
dev_printk(KERN_ERR, dev, "53c700: scsi_add_host failed\n");
scsi_host_put(host);
return NULL;
}
spi_signalling(host) = hostdata->differential ? SPI_SIGNAL_HVD :
SPI_SIGNAL_SE;
return host;
}
int
NCR_700_release(struct Scsi_Host *host)
{
struct NCR_700_Host_Parameters *hostdata =
(struct NCR_700_Host_Parameters *)host->hostdata[0];
dma_free_noncoherent(hostdata->dev, TOTAL_MEM_SIZE,
hostdata->script, hostdata->pScript);
return 1;
}
static inline __u8
NCR_700_identify(int can_disconnect, __u8 lun)
{
return IDENTIFY_BASE |
((can_disconnect) ? 0x40 : 0) |
(lun & NCR_700_LUN_MASK);
}
/*
* Function : static int data_residual (Scsi_Host *host)
*
* Purpose : return residual data count of what's in the chip. If you
* really want to know what this function is doing, it's almost a
* direct transcription of the algorithm described in the 53c710
* guide, except that the DBC and DFIFO registers are only 6 bits
* wide on a 53c700.
*
* Inputs : host - SCSI host */
static inline int
NCR_700_data_residual (struct Scsi_Host *host) {
struct NCR_700_Host_Parameters *hostdata =
(struct NCR_700_Host_Parameters *)host->hostdata[0];
int count, synchronous = 0;
unsigned int ddir;
if(hostdata->chip710) {
count = ((NCR_700_readb(host, DFIFO_REG) & 0x7f) -
(NCR_700_readl(host, DBC_REG) & 0x7f)) & 0x7f;
} else {
count = ((NCR_700_readb(host, DFIFO_REG) & 0x3f) -
(NCR_700_readl(host, DBC_REG) & 0x3f)) & 0x3f;
}
if(hostdata->fast)
synchronous = NCR_700_readb(host, SXFER_REG) & 0x0f;
/* get the data direction */
ddir = NCR_700_readb(host, CTEST0_REG) & 0x01;
if (ddir) {
/* Receive */
if (synchronous)
count += (NCR_700_readb(host, SSTAT2_REG) & 0xf0) >> 4;
else
if (NCR_700_readb(host, SSTAT1_REG) & SIDL_REG_FULL)
++count;
} else {
/* Send */
__u8 sstat = NCR_700_readb(host, SSTAT1_REG);
if (sstat & SODL_REG_FULL)
++count;
if (synchronous && (sstat & SODR_REG_FULL))
++count;
}
#ifdef NCR_700_DEBUG
if(count)
printk("RESIDUAL IS %d (ddir %d)\n", count, ddir);
#endif
return count;
}
/* print out the SCSI wires and corresponding phase from the SBCL register
* in the chip */
static inline char *
sbcl_to_string(__u8 sbcl)
{
int i;
static char ret[256];
ret[0]='\0';
for(i=0; i<8; i++) {
if((1<<i) & sbcl)
strcat(ret, NCR_700_SBCL_bits[i]);
}
strcat(ret, NCR_700_SBCL_to_phase[sbcl & 0x07]);
return ret;
}
static inline __u8
bitmap_to_number(__u8 bitmap)
{
__u8 i;
for(i=0; i<8 && !(bitmap &(1<<i)); i++)
;
return i;
}
/* Pull a slot off the free list */
STATIC struct NCR_700_command_slot *
find_empty_slot(struct NCR_700_Host_Parameters *hostdata)
{
struct NCR_700_command_slot *slot = hostdata->free_list;
if(slot == NULL) {
/* sanity check */
if(hostdata->command_slot_count != NCR_700_COMMAND_SLOTS_PER_HOST)
printk(KERN_ERR "SLOTS FULL, but count is %d, should be %d\n", hostdata->command_slot_count, NCR_700_COMMAND_SLOTS_PER_HOST);
return NULL;
}
if(slot->state != NCR_700_SLOT_FREE)
/* should panic! */
printk(KERN_ERR "BUSY SLOT ON FREE LIST!!!\n");
hostdata->free_list = slot->ITL_forw;
slot->ITL_forw = NULL;
/* NOTE: set the state to busy here, not queued, since this
* indicates the slot is in use and cannot be run by the IRQ
* finish routine. If we cannot queue the command when it
* is properly build, we then change to NCR_700_SLOT_QUEUED */
slot->state = NCR_700_SLOT_BUSY;
slot->flags = 0;
hostdata->command_slot_count++;
return slot;
}
STATIC void
free_slot(struct NCR_700_command_slot *slot,
struct NCR_700_Host_Parameters *hostdata)
{
if((slot->state & NCR_700_SLOT_MASK) != NCR_700_SLOT_MAGIC) {
printk(KERN_ERR "53c700: SLOT %p is not MAGIC!!!\n", slot);
}
if(slot->state == NCR_700_SLOT_FREE) {
printk(KERN_ERR "53c700: SLOT %p is FREE!!!\n", slot);
}
slot->resume_offset = 0;
slot->cmnd = NULL;
slot->state = NCR_700_SLOT_FREE;
slot->ITL_forw = hostdata->free_list;
hostdata->free_list = slot;
hostdata->command_slot_count--;
}
/* This routine really does very little. The command is indexed on
the ITL and (if tagged) the ITLQ lists in _queuecommand */
STATIC void
save_for_reselection(struct NCR_700_Host_Parameters *hostdata,
struct scsi_cmnd *SCp, __u32 dsp)
{
/* Its just possible that this gets executed twice */
if(SCp != NULL) {
struct NCR_700_command_slot *slot =
(struct NCR_700_command_slot *)SCp->host_scribble;
slot->resume_offset = dsp;
}
hostdata->state = NCR_700_HOST_FREE;
hostdata->cmd = NULL;
}
STATIC inline void
NCR_700_unmap(struct NCR_700_Host_Parameters *hostdata, struct scsi_cmnd *SCp,
struct NCR_700_command_slot *slot)
{
if(SCp->sc_data_direction != DMA_NONE &&
SCp->sc_data_direction != DMA_BIDIRECTIONAL)
scsi_dma_unmap(SCp);
}
STATIC inline void
NCR_700_scsi_done(struct NCR_700_Host_Parameters *hostdata,
struct scsi_cmnd *SCp, int result)
{
hostdata->state = NCR_700_HOST_FREE;
hostdata->cmd = NULL;
if(SCp != NULL) {
struct NCR_700_command_slot *slot =
(struct NCR_700_command_slot *)SCp->host_scribble;
dma_unmap_single(hostdata->dev, slot->pCmd,
MAX_COMMAND_SIZE, DMA_TO_DEVICE);
if (slot->flags == NCR_700_FLAG_AUTOSENSE) {
char *cmnd = NCR_700_get_sense_cmnd(SCp->device);
#ifdef NCR_700_DEBUG
printk(" ORIGINAL CMD %p RETURNED %d, new return is %d sense is\n",
SCp, SCp->cmnd[7], result);
scsi_print_sense("53c700", SCp);
#endif
dma_unmap_single(hostdata->dev, slot->dma_handle,
SCSI_SENSE_BUFFERSIZE, DMA_FROM_DEVICE);
/* restore the old result if the request sense was
* successful */
if (result == 0)
result = cmnd[7];
/* restore the original length */
SCp->cmd_len = cmnd[8];
} else
NCR_700_unmap(hostdata, SCp, slot);
free_slot(slot, hostdata);
#ifdef NCR_700_DEBUG
if(NCR_700_get_depth(SCp->device) == 0 ||
NCR_700_get_depth(SCp->device) > SCp->device->queue_depth)
printk(KERN_ERR "Invalid depth in NCR_700_scsi_done(): %d\n",
NCR_700_get_depth(SCp->device));
#endif /* NCR_700_DEBUG */
NCR_700_set_depth(SCp->device, NCR_700_get_depth(SCp->device) - 1);
SCp->host_scribble = NULL;
SCp->result = result;
SCp->scsi_done(SCp);
} else {
printk(KERN_ERR "53c700: SCSI DONE HAS NULL SCp\n");
}
}
STATIC void
NCR_700_internal_bus_reset(struct Scsi_Host *host)
{
/* Bus reset */
NCR_700_writeb(ASSERT_RST, host, SCNTL1_REG);
udelay(50);
NCR_700_writeb(0, host, SCNTL1_REG);
}
STATIC void
NCR_700_chip_setup(struct Scsi_Host *host)
{
struct NCR_700_Host_Parameters *hostdata =
(struct NCR_700_Host_Parameters *)host->hostdata[0];
__u8 min_period;
__u8 min_xferp = (hostdata->chip710 ? NCR_710_MIN_XFERP : NCR_700_MIN_XFERP);
if(hostdata->chip710) {
__u8 burst_disable = 0;
__u8 burst_length = 0;
switch (hostdata->burst_length) {
case 1:
burst_length = BURST_LENGTH_1;
break;
case 2:
burst_length = BURST_LENGTH_2;
break;
case 4:
burst_length = BURST_LENGTH_4;
break;
case 8:
burst_length = BURST_LENGTH_8;
break;
default:
burst_disable = BURST_DISABLE;
break;
}
hostdata->dcntl_extra |= COMPAT_700_MODE;
NCR_700_writeb(hostdata->dcntl_extra, host, DCNTL_REG);
NCR_700_writeb(burst_length | hostdata->dmode_extra,
host, DMODE_710_REG);
NCR_700_writeb(burst_disable | hostdata->ctest7_extra |
(hostdata->differential ? DIFF : 0),
host, CTEST7_REG);
NCR_700_writeb(BTB_TIMER_DISABLE, host, CTEST0_REG);
NCR_700_writeb(FULL_ARBITRATION | ENABLE_PARITY | PARITY
| AUTO_ATN, host, SCNTL0_REG);
} else {
NCR_700_writeb(BURST_LENGTH_8 | hostdata->dmode_extra,
host, DMODE_700_REG);
NCR_700_writeb(hostdata->differential ?
DIFF : 0, host, CTEST7_REG);
if(hostdata->fast) {
/* this is for 700-66, does nothing on 700 */
NCR_700_writeb(LAST_DIS_ENBL | ENABLE_ACTIVE_NEGATION
| GENERATE_RECEIVE_PARITY, host,
CTEST8_REG);
} else {
NCR_700_writeb(FULL_ARBITRATION | ENABLE_PARITY
| PARITY | AUTO_ATN, host, SCNTL0_REG);
}
}
NCR_700_writeb(1 << host->this_id, host, SCID_REG);
NCR_700_writeb(0, host, SBCL_REG);
NCR_700_writeb(ASYNC_OPERATION, host, SXFER_REG);
NCR_700_writeb(PHASE_MM_INT | SEL_TIMEOUT_INT | GROSS_ERR_INT | UX_DISC_INT
| RST_INT | PAR_ERR_INT | SELECT_INT, host, SIEN_REG);
NCR_700_writeb(ABORT_INT | INT_INST_INT | ILGL_INST_INT, host, DIEN_REG);
NCR_700_writeb(ENABLE_SELECT, host, SCNTL1_REG);
if(hostdata->clock > 75) {
printk(KERN_ERR "53c700: Clock speed %dMHz is too high: 75Mhz is the maximum this chip can be driven at\n", hostdata->clock);
/* do the best we can, but the async clock will be out
* of spec: sync divider 2, async divider 3 */
DEBUG(("53c700: sync 2 async 3\n"));
NCR_700_writeb(SYNC_DIV_2_0, host, SBCL_REG);
NCR_700_writeb(ASYNC_DIV_3_0 | hostdata->dcntl_extra, host, DCNTL_REG);
hostdata->sync_clock = hostdata->clock/2;
} else if(hostdata->clock > 50 && hostdata->clock <= 75) {
/* sync divider 1.5, async divider 3 */
DEBUG(("53c700: sync 1.5 async 3\n"));
NCR_700_writeb(SYNC_DIV_1_5, host, SBCL_REG);
NCR_700_writeb(ASYNC_DIV_3_0 | hostdata->dcntl_extra, host, DCNTL_REG);
hostdata->sync_clock = hostdata->clock*2;
hostdata->sync_clock /= 3;
} else if(hostdata->clock > 37 && hostdata->clock <= 50) {
/* sync divider 1, async divider 2 */
DEBUG(("53c700: sync 1 async 2\n"));
NCR_700_writeb(SYNC_DIV_1_0, host, SBCL_REG);
NCR_700_writeb(ASYNC_DIV_2_0 | hostdata->dcntl_extra, host, DCNTL_REG);
hostdata->sync_clock = hostdata->clock;
} else if(hostdata->clock > 25 && hostdata->clock <=37) {
/* sync divider 1, async divider 1.5 */
DEBUG(("53c700: sync 1 async 1.5\n"));
NCR_700_writeb(SYNC_DIV_1_0, host, SBCL_REG);
NCR_700_writeb(ASYNC_DIV_1_5 | hostdata->dcntl_extra, host, DCNTL_REG);
hostdata->sync_clock = hostdata->clock;
} else {
DEBUG(("53c700: sync 1 async 1\n"));
NCR_700_writeb(SYNC_DIV_1_0, host, SBCL_REG);
NCR_700_writeb(ASYNC_DIV_1_0 | hostdata->dcntl_extra, host, DCNTL_REG);
/* sync divider 1, async divider 1 */
hostdata->sync_clock = hostdata->clock;
}
/* Calculate the actual minimum period that can be supported
* by our synchronous clock speed. See the 710 manual for
* exact details of this calculation which is based on a
* setting of the SXFER register */
min_period = 1000*(4+min_xferp)/(4*hostdata->sync_clock);
hostdata->min_period = NCR_700_MIN_PERIOD;
if(min_period > NCR_700_MIN_PERIOD)
hostdata->min_period = min_period;
}
STATIC void
NCR_700_chip_reset(struct Scsi_Host *host)
{
struct NCR_700_Host_Parameters *hostdata =
(struct NCR_700_Host_Parameters *)host->hostdata[0];
if(hostdata->chip710) {
NCR_700_writeb(SOFTWARE_RESET_710, host, ISTAT_REG);
udelay(100);
NCR_700_writeb(0, host, ISTAT_REG);
} else {
NCR_700_writeb(SOFTWARE_RESET, host, DCNTL_REG);
udelay(100);
NCR_700_writeb(0, host, DCNTL_REG);
}
mdelay(1000);
NCR_700_chip_setup(host);
}
/* The heart of the message processing engine is that the instruction
* immediately after the INT is the normal case (and so must be CLEAR
* ACK). If we want to do something else, we call that routine in
* scripts and set temp to be the normal case + 8 (skipping the CLEAR
* ACK) so that the routine returns correctly to resume its activity
* */
STATIC __u32
process_extended_message(struct Scsi_Host *host,
struct NCR_700_Host_Parameters *hostdata,
struct scsi_cmnd *SCp, __u32 dsp, __u32 dsps)
{
__u32 resume_offset = dsp, temp = dsp + 8;
__u8 pun = 0xff, lun = 0xff;
if(SCp != NULL) {
pun = SCp->device->id;
lun = SCp->device->lun;
}
switch(hostdata->msgin[2]) {
case A_SDTR_MSG:
if(SCp != NULL && NCR_700_is_flag_set(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION)) {
struct scsi_target *starget = SCp->device->sdev_target;
__u8 period = hostdata->msgin[3];
__u8 offset = hostdata->msgin[4];
if(offset == 0 || period == 0) {
offset = 0;
period = 0;
}
spi_offset(starget) = offset;
spi_period(starget) = period;
if(NCR_700_is_flag_set(SCp->device, NCR_700_DEV_PRINT_SYNC_NEGOTIATION)) {
spi_display_xfer_agreement(starget);
NCR_700_clear_flag(SCp->device, NCR_700_DEV_PRINT_SYNC_NEGOTIATION);
}
NCR_700_set_flag(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC);
NCR_700_clear_flag(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
NCR_700_writeb(NCR_700_get_SXFER(SCp->device),
host, SXFER_REG);
} else {
/* SDTR message out of the blue, reject it */
shost_printk(KERN_WARNING, host,
"Unexpected SDTR msg\n");
hostdata->msgout[0] = A_REJECT_MSG;
dma_cache_sync(hostdata->dev, hostdata->msgout, 1, DMA_TO_DEVICE);
script_patch_16(hostdata->dev, hostdata->script,
MessageCount, 1);
/* SendMsgOut returns, so set up the return
* address */
resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
}
break;
case A_WDTR_MSG:
printk(KERN_INFO "scsi%d: (%d:%d), Unsolicited WDTR after CMD, Rejecting\n",
host->host_no, pun, lun);
hostdata->msgout[0] = A_REJECT_MSG;
dma_cache_sync(hostdata->dev, hostdata->msgout, 1, DMA_TO_DEVICE);
script_patch_16(hostdata->dev, hostdata->script, MessageCount,
1);
resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
break;
default:
printk(KERN_INFO "scsi%d (%d:%d): Unexpected message %s: ",
host->host_no, pun, lun,
NCR_700_phase[(dsps & 0xf00) >> 8]);
spi_print_msg(hostdata->msgin);
printk("\n");
/* just reject it */
hostdata->msgout[0] = A_REJECT_MSG;
dma_cache_sync(hostdata->dev, hostdata->msgout, 1, DMA_TO_DEVICE);
script_patch_16(hostdata->dev, hostdata->script, MessageCount,
1);
/* SendMsgOut returns, so set up the return
* address */
resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
}
NCR_700_writel(temp, host, TEMP_REG);
return resume_offset;
}
STATIC __u32
process_message(struct Scsi_Host *host, struct NCR_700_Host_Parameters *hostdata,
struct scsi_cmnd *SCp, __u32 dsp, __u32 dsps)
{
/* work out where to return to */
__u32 temp = dsp + 8, resume_offset = dsp;
__u8 pun = 0xff, lun = 0xff;
if(SCp != NULL) {
pun = SCp->device->id;
lun = SCp->device->lun;
}
#ifdef NCR_700_DEBUG
printk("scsi%d (%d:%d): message %s: ", host->host_no, pun, lun,
NCR_700_phase[(dsps & 0xf00) >> 8]);
spi_print_msg(hostdata->msgin);
printk("\n");
#endif
switch(hostdata->msgin[0]) {
case A_EXTENDED_MSG:
resume_offset = process_extended_message(host, hostdata, SCp,
dsp, dsps);
break;
case A_REJECT_MSG:
if(SCp != NULL && NCR_700_is_flag_set(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION)) {
/* Rejected our sync negotiation attempt */
spi_period(SCp->device->sdev_target) =
spi_offset(SCp->device->sdev_target) = 0;
NCR_700_set_flag(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC);
NCR_700_clear_flag(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
} else if(SCp != NULL && NCR_700_get_tag_neg_state(SCp->device) == NCR_700_DURING_TAG_NEGOTIATION) {
/* rejected our first simple tag message */
scmd_printk(KERN_WARNING, SCp,
"Rejected first tag queue attempt, turning off tag queueing\n");
/* we're done negotiating */
NCR_700_set_tag_neg_state(SCp->device, NCR_700_FINISHED_TAG_NEGOTIATION);
hostdata->tag_negotiated &= ~(1<<scmd_id(SCp));
SCp->device->tagged_supported = 0;
scsi_deactivate_tcq(SCp->device, host->cmd_per_lun);
} else {
shost_printk(KERN_WARNING, host,
"(%d:%d) Unexpected REJECT Message %s\n",
pun, lun,
NCR_700_phase[(dsps & 0xf00) >> 8]);
/* however, just ignore it */
}
break;
case A_PARITY_ERROR_MSG:
printk(KERN_ERR "scsi%d (%d:%d) Parity Error!\n", host->host_no,
pun, lun);
NCR_700_internal_bus_reset(host);
break;
case A_SIMPLE_TAG_MSG:
printk(KERN_INFO "scsi%d (%d:%d) SIMPLE TAG %d %s\n", host->host_no,
pun, lun, hostdata->msgin[1],
NCR_700_phase[(dsps & 0xf00) >> 8]);
/* just ignore it */
break;
default:
printk(KERN_INFO "scsi%d (%d:%d): Unexpected message %s: ",
host->host_no, pun, lun,
NCR_700_phase[(dsps & 0xf00) >> 8]);
spi_print_msg(hostdata->msgin);
printk("\n");
/* just reject it */
hostdata->msgout[0] = A_REJECT_MSG;
dma_cache_sync(hostdata->dev, hostdata->msgout, 1, DMA_TO_DEVICE);
script_patch_16(hostdata->dev, hostdata->script, MessageCount,
1);
/* SendMsgOut returns, so set up the return
* address */
resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
break;
}
NCR_700_writel(temp, host, TEMP_REG);
/* set us up to receive another message */
dma_cache_sync(hostdata->dev, hostdata->msgin, MSG_ARRAY_SIZE, DMA_FROM_DEVICE);
return resume_offset;
}
STATIC __u32
process_script_interrupt(__u32 dsps, __u32 dsp, struct scsi_cmnd *SCp,
struct Scsi_Host *host,
struct NCR_700_Host_Parameters *hostdata)
{
__u32 resume_offset = 0;
__u8 pun = 0xff, lun=0xff;
if(SCp != NULL) {
pun = SCp->device->id;
lun = SCp->device->lun;
}
if(dsps == A_GOOD_STATUS_AFTER_STATUS) {
DEBUG((" COMMAND COMPLETE, status=%02x\n",
hostdata->status[0]));
/* OK, if TCQ still under negotiation, we now know it works */
if (NCR_700_get_tag_neg_state(SCp->device) == NCR_700_DURING_TAG_NEGOTIATION)
NCR_700_set_tag_neg_state(SCp->device,
NCR_700_FINISHED_TAG_NEGOTIATION);
/* check for contingent allegiance contitions */
if(status_byte(hostdata->status[0]) == CHECK_CONDITION ||
status_byte(hostdata->status[0]) == COMMAND_TERMINATED) {
struct NCR_700_command_slot *slot =
(struct NCR_700_command_slot *)SCp->host_scribble;
if(slot->flags == NCR_700_FLAG_AUTOSENSE) {
/* OOPS: bad device, returning another
* contingent allegiance condition */
scmd_printk(KERN_ERR, SCp,
"broken device is looping in contingent allegiance: ignoring\n");
NCR_700_scsi_done(hostdata, SCp, hostdata->status[0]);
} else {
char *cmnd =
NCR_700_get_sense_cmnd(SCp->device);
#ifdef NCR_DEBUG
scsi_print_command(SCp);
printk(" cmd %p has status %d, requesting sense\n",
SCp, hostdata->status[0]);
#endif
/* we can destroy the command here
* because the contingent allegiance
* condition will cause a retry which
* will re-copy the command from the
* saved data_cmnd. We also unmap any