aboutsummaryrefslogtreecommitdiff
path: root/drivers/block/xsysace.c
blob: e5c5415eb45eb7a7e8f350427be29fcfe2fb3eec (plain)
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
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
/*
 * Xilinx SystemACE device driver
 *
 * Copyright 2007 Secret Lab Technologies Ltd.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 as published
 * by the Free Software Foundation.
 */

/*
 * The SystemACE chip is designed to configure FPGAs by loading an FPGA
 * bitstream from a file on a CF card and squirting it into FPGAs connected
 * to the SystemACE JTAG chain.  It also has the advantage of providing an
 * MPU interface which can be used to control the FPGA configuration process
 * and to use the attached CF card for general purpose storage.
 *
 * This driver is a block device driver for the SystemACE.
 *
 * Initialization:
 *    The driver registers itself as a platform_device driver at module
 *    load time.  The platform bus will take care of calling the
 *    ace_probe() method for all SystemACE instances in the system.  Any
 *    number of SystemACE instances are supported.  ace_probe() calls
 *    ace_setup() which initialized all data structures, reads the CF
 *    id structure and registers the device.
 *
 * Processing:
 *    Just about all of the heavy lifting in this driver is performed by
 *    a Finite State Machine (FSM).  The driver needs to wait on a number
 *    of events; some raised by interrupts, some which need to be polled
 *    for.  Describing all of the behaviour in a FSM seems to be the
 *    easiest way to keep the complexity low and make it easy to
 *    understand what the driver is doing.  If the block ops or the
 *    request function need to interact with the hardware, then they
 *    simply need to flag the request and kick of FSM processing.
 *
 *    The FSM itself is atomic-safe code which can be run from any
 *    context.  The general process flow is:
 *    1. obtain the ace->lock spinlock.
 *    2. loop on ace_fsm_dostate() until the ace->fsm_continue flag is
 *       cleared.
 *    3. release the lock.
 *
 *    Individual states do not sleep in any way.  If a condition needs to
 *    be waited for then the state much clear the fsm_continue flag and
 *    either schedule the FSM to be run again at a later time, or expect
 *    an interrupt to call the FSM when the desired condition is met.
 *
 *    In normal operation, the FSM is processed at interrupt context
 *    either when the driver's tasklet is scheduled, or when an irq is
 *    raised by the hardware.  The tasklet can be scheduled at any time.
 *    The request method in particular schedules the tasklet when a new
 *    request has been indicated by the block layer.  Once started, the
 *    FSM proceeds as far as it can processing the request until it
 *    needs on a hardware event.  At this point, it must yield execution.
 *
 *    A state has two options when yielding execution:
 *    1. ace_fsm_yield()
 *       - Call if need to poll for event.
 *       - clears the fsm_continue flag to exit the processing loop
 *       - reschedules the tasklet to run again as soon as possible
 *    2. ace_fsm_yieldirq()
 *       - Call if an irq is expected from the HW
 *       - clears the fsm_continue flag to exit the processing loop
 *       - does not reschedule the tasklet so the FSM will not be processed
 *         again until an irq is received.
 *    After calling a yield function, the state must return control back
 *    to the FSM main loop.
 *
 *    Additionally, the driver maintains a kernel timer which can process
 *    the FSM.  If the FSM gets stalled, typically due to a missed
 *    interrupt, then the kernel timer will expire and the driver can
 *    continue where it left off.
 *
 * To Do:
 *    - Add FPGA configuration control interface.
 *    - Request major number from lanana
 */

#undef DEBUG

#include <linux/module.h>
#include <linux/ctype.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/slab.h>
#include <linux/blkdev.h>
#include <linux/ata.h>
#include <linux/hdreg.h>
#include <linux/platform_device.h>
#if defined(CONFIG_OF)
#include <linux/of_device.h>
#include <linux/of_platform.h>
#endif

MODULE_AUTHOR("Grant Likely <grant.likely@secretlab.ca>");
MODULE_DESCRIPTION("Xilinx SystemACE device driver");
MODULE_LICENSE("GPL");

/* SystemACE register definitions */
#define ACE_BUSMODE (0x00)

#define ACE_STATUS (0x04)
#define ACE_STATUS_CFGLOCK      (0x00000001)
#define ACE_STATUS_MPULOCK      (0x00000002)
#define ACE_STATUS_CFGERROR     (0x00000004)	/* config controller error */
#define ACE_STATUS_CFCERROR     (0x00000008)	/* CF controller error */
#define ACE_STATUS_CFDETECT     (0x00000010)
#define ACE_STATUS_DATABUFRDY   (0x00000020)
#define ACE_STATUS_DATABUFMODE  (0x00000040)
#define ACE_STATUS_CFGDONE      (0x00000080)
#define ACE_STATUS_RDYFORCFCMD  (0x00000100)
#define ACE_STATUS_CFGMODEPIN   (0x00000200)
#define ACE_STATUS_CFGADDR_MASK (0x0000e000)
#define ACE_STATUS_CFBSY        (0x00020000)
#define ACE_STATUS_CFRDY        (0x00040000)
#define ACE_STATUS_CFDWF        (0x00080000)
#define ACE_STATUS_CFDSC        (0x00100000)
#define ACE_STATUS_CFDRQ        (0x00200000)
#define ACE_STATUS_CFCORR       (0x00400000)
#define ACE_STATUS_CFERR        (0x00800000)

#define ACE_ERROR (0x08)
#define ACE_CFGLBA (0x0c)
#define ACE_MPULBA (0x10)

#define ACE_SECCNTCMD (0x14)
#define ACE_SECCNTCMD_RESET      (0x0100)
#define ACE_SECCNTCMD_IDENTIFY   (0x0200)
#define ACE_SECCNTCMD_READ_DATA  (0x0300)
#define ACE_SECCNTCMD_WRITE_DATA (0x0400)
#define ACE_SECCNTCMD_ABORT      (0x0600)

#define ACE_VERSION (0x16)
#define ACE_VERSION_REVISION_MASK (0x00FF)
#define ACE_VERSION_MINOR_MASK    (0x0F00)
#define ACE_VERSION_MAJOR_MASK    (0xF000)

#define ACE_CTRL (0x18)
#define ACE_CTRL_FORCELOCKREQ   (0x0001)
#define ACE_CTRL_LOCKREQ        (0x0002)
#define ACE_CTRL_FORCECFGADDR   (0x0004)
#define ACE_CTRL_FORCECFGMODE   (0x0008)
#define ACE_CTRL_CFGMODE        (0x0010)
#define ACE_CTRL_CFGSTART       (0x0020)
#define ACE_CTRL_CFGSEL         (0x0040)
#define ACE_CTRL_CFGRESET       (0x0080)
#define ACE_CTRL_DATABUFRDYIRQ  (0x0100)
#define ACE_CTRL_ERRORIRQ       (0x0200)
#define ACE_CTRL_CFGDONEIRQ     (0x0400)
#define ACE_CTRL_RESETIRQ       (0x0800)
#define ACE_CTRL_CFGPROG        (0x1000)
#define ACE_CTRL_CFGADDR_MASK   (0xe000)

#define ACE_FATSTAT (0x1c)

#define ACE_NUM_MINORS 16
#define ACE_SECTOR_SIZE (512)
#define ACE_FIFO_SIZE (32)
#define ACE_BUF_PER_SECTOR (ACE_SECTOR_SIZE / ACE_FIFO_SIZE)

#define ACE_BUS_WIDTH_8  0
#define ACE_BUS_WIDTH_16 1

struct ace_reg_ops;

struct ace_device {
	/* driver state data */
	int id;
	int media_change;
	int users;
	struct list_head list;

	/* finite state machine data */
	struct tasklet_struct fsm_tasklet;
	uint fsm_task;		/* Current activity (ACE_TASK_*) */
	uint fsm_state;		/* Current state (ACE_FSM_STATE_*) */
	uint fsm_continue_flag;	/* cleared to exit FSM mainloop */
	uint fsm_iter_num;
	struct timer_list stall_timer;

	/* Transfer state/result, use for both id and block request */
	struct request *req;	/* request being processed */
	void *data_ptr;		/* pointer to I/O buffer */
	int data_count;		/* number of buffers remaining */
	int data_result;	/* Result of transfer; 0 := success */

	int id_req_count;	/* count of id requests */
	int id_result;
	struct completion id_completion;	/* used when id req finishes */
	int in_irq;

	/* Details of hardware device */
	resource_size_t physaddr;
	void __iomem *baseaddr;
	int irq;
	int bus_width;		/* 0 := 8 bit; 1 := 16 bit */
	struct ace_reg_ops *reg_ops;
	int lock_count;

	/* Block device data structures */
	spinlock_t lock;
	struct device *dev;
	struct request_queue *queue;
	struct gendisk *gd;

	/* Inserted CF card parameters */
	u16 cf_id[ATA_ID_WORDS];
};

static int ace_major;

/* ---------------------------------------------------------------------
 * Low level register access
 */

struct ace_reg_ops {
	u16(*in) (struct ace_device * ace, int reg);
	void (*out) (struct ace_device * ace, int reg, u16 val);
	void (*datain) (struct ace_device * ace);
	void (*dataout) (struct ace_device * ace);
};

/* 8 Bit bus width */
static u16 ace_in_8(struct ace_device *ace, int reg)
{
	void __iomem *r = ace->baseaddr + reg;
	return in_8(r) | (in_8(r + 1) << 8);
}

static void ace_out_8(struct ace_device *ace, int reg, u16 val)
{
	void __iomem *r = ace->baseaddr + reg;
	out_8(r, val);
	out_8(r + 1, val >> 8);
}

static void ace_datain_8(struct ace_device *ace)
{
	void __iomem *r = ace->baseaddr + 0x40;
	u8 *dst = ace->data_ptr;
	int i = ACE_FIFO_SIZE;
	while (i--)
		*dst++ = in_8(r++);
	ace->data_ptr = dst;
}

static void ace_dataout_8(struct ace_device *ace)
{
	void __iomem *r = ace->baseaddr + 0x40;
	u8 *src = ace->data_ptr;
	int i = ACE_FIFO_SIZE;
	while (i--)
		out_8(r++, *src++);
	ace->data_ptr = src;
}

static struct ace_reg_ops ace_reg_8_ops = {
	.in = ace_in_8,
	.out = ace_out_8,
	.datain = ace_datain_8,
	.dataout = ace_dataout_8,
};

/* 16 bit big endian bus attachment */
static u16 ace_in_be16(struct ace_device *ace, int reg)
{
	return in_be16(ace->baseaddr + reg);
}

static void ace_out_be16(struct ace_device *ace, int reg, u16 val)
{
	out_be16(ace->baseaddr + reg, val);
}

static void ace_datain_be16(struct ace_device *ace)
{
	int i = ACE_FIFO_SIZE / 2;
	u16 *dst = ace->data_ptr;
	while (i--)
		*dst++ = in_le16(ace->baseaddr + 0x40);
	ace->data_ptr = dst;
}

static void ace_dataout_be16(struct ace_device *ace)
{
	int i = ACE_FIFO_SIZE / 2;
	u16 *src = ace->data_ptr;
	while (i--)
		out_le16(ace->baseaddr + 0x40, *src++);
	ace->data_ptr = src;
}

/* 16 bit little endian bus attachment */
static u16 ace_in_le16(struct ace_device *ace, int reg)
{
	return in_le16(ace->baseaddr + reg);
}

static void ace_out_le16(struct ace_device *ace, int reg, u16 val)
{
	out_le16(ace->baseaddr + reg, val);
}

static void ace_datain_le16(struct ace_device *ace)
{
	int i = ACE_FIFO_SIZE / 2;
	u16 *dst = ace->data_ptr;
	while (i--)
		*dst++ = in_be16(ace->baseaddr + 0x40);
	ace->data_ptr = dst;
}

static void ace_dataout_le16(struct ace_device *ace)
{
	int i = ACE_FIFO_SIZE / 2;
	u16 *src = ace->data_ptr;
	while (i--)
		out_be16(ace->baseaddr + 0x40, *src++);
	ace->data_ptr = src;
}

static struct ace_reg_ops ace_reg_be16_ops = {
	.in = ace_in_be16,
	.out = ace_out_be16,
	.datain = ace_datain_be16,
	.dataout = ace_dataout_be16,
};

static struct ace_reg_ops ace_reg_le16_ops = {
	.in = ace_in_le16,
	.out = ace_out_le16,
	.datain = ace_datain_le16,
	.dataout = ace_dataout_le16,
};

static inline u16 ace_in(struct ace_device *ace, int reg)
{
	return ace->reg_ops->in(ace, reg);
}

static inline u32 ace_in32(struct ace_device *ace, int reg)
{
	return ace_in(ace, reg) | (ace_in(ace, reg + 2) << 16);
}

static inline void ace_out(struct ace_device *ace, int reg, u16 val)
{
	ace->reg_ops->out(ace, reg, val);
}

static inline void ace_out32(struct ace_device *ace, int reg, u32 val)
{
	ace_out(ace, reg, val);
	ace_out(ace, reg + 2, val >> 16);
}

/* ---------------------------------------------------------------------
 * Debug support functions
 */

#if defined(DEBUG)
static void ace_dump_mem(void *base, int len)
{
	const char *ptr = base;
	int i, j;

	for (i = 0; i < len; i += 16) {
		printk(KERN_INFO "%.8x:", i);
		for (j = 0; j < 16; j++) {
			if (!(j % 4))
				printk(" ");
			printk("%.2x", ptr[i + j]);
		}
		printk(" ");
		for (j = 0; j < 16; j++)
			printk("%c", isprint(ptr[i + j]) ? ptr[i + j] : '.');
		printk("\n");
	}
}
#else
static inline void ace_dump_mem(void *base, int len)
{
}
#endif

static void ace_dump_regs(struct ace_device *ace)
{
	dev_info(ace->dev,
		 "    ctrl:  %.8x  seccnt/cmd: %.4x      ver:%.4x\n"
		 "    status:%.8x  mpu_lba:%.8x  busmode:%4x\n"
		 "    error: %.8x  cfg_lba:%.8x  fatstat:%.4x\n",
		 ace_in32(ace, ACE_CTRL),
		 ace_in(ace, ACE_SECCNTCMD),
		 ace_in(ace, ACE_VERSION),
		 ace_in32(ace, ACE_STATUS),
		 ace_in32(ace, ACE_MPULBA),
		 ace_in(ace, ACE_BUSMODE),
		 ace_in32(ace, ACE_ERROR),
		 ace_in32(ace, ACE_CFGLBA), ace_in(ace, ACE_FATSTAT));
}

void ace_fix_driveid(u16 *id)
{
#if defined(__BIG_ENDIAN)
	int i;

	/* All half words have wrong byte order; swap the bytes */
	for (i = 0; i < ATA_ID_WORDS; i++, id++)
		*id = le16_to_cpu(*id);
#endif
}

/* ---------------------------------------------------------------------
 * Finite State Machine (FSM) implementation
 */

/* FSM tasks; used to direct state transitions */
#define ACE_TASK_IDLE      0
#define ACE_TASK_IDENTIFY  1
#define ACE_TASK_READ      2
#define ACE_TASK_WRITE     3
#define ACE_FSM_NUM_TASKS  4

/* FSM state definitions */
#define ACE_FSM_STATE_IDLE               0
#define ACE_FSM_STATE_REQ_LOCK           1
#define ACE_FSM_STATE_WAIT_LOCK          2
#define ACE_FSM_STATE_WAIT_CFREADY       3
#define ACE_FSM_STATE_IDENTIFY_PREPARE   4
#define ACE_FSM_STATE_IDENTIFY_TRANSFER  5
#define ACE_FSM_STATE_IDENTIFY_COMPLETE  6
#define ACE_FSM_STATE_REQ_PREPARE        7
#define ACE_FSM_STATE_REQ_TRANSFER       8
#define ACE_FSM_STATE_REQ_COMPLETE       9
#define ACE_FSM_STATE_ERROR             10
#define ACE_FSM_NUM_STATES              11

/* Set flag to exit FSM loop and reschedule tasklet */
static inline void ace_fsm_yield(struct ace_device *ace)
{
	dev_dbg(ace->dev, "ace_fsm_yield()\n");
	tasklet_schedule(&ace->fsm_tasklet);
	ace->fsm_continue_flag = 0;
}

/* Set flag to exit FSM loop and wait for IRQ to reschedule tasklet */
static inline void ace_fsm_yieldirq(struct ace_device *ace)
{
	dev_dbg(ace->dev, "ace_fsm_yieldirq()\n");

	if (ace->irq == NO_IRQ)
		/* No IRQ assigned, so need to poll */
		tasklet_schedule(&ace->fsm_tasklet);
	ace->fsm_continue_flag = 0;
}

/* Get the next read/write request; ending requests that we don't handle */
struct request *ace_get_next_request(struct request_queue * q)
{
	struct request *req;

	while ((req = blk_peek_request(q)) != NULL) {
		if (blk_fs_request(req))
			break;
		blk_start_request(req);
		__blk_end_request_all(req, -EIO);
	}
	return req;
}

static void ace_fsm_dostate(struct ace_device *ace)
{
	struct request *req;
	u32 status;
	u16 val;
	int count;

#if defined(DEBUG)
	dev_dbg(ace->dev, "fsm_state=%i, id_req_count=%i\n",
		ace->fsm_state, ace->id_req_count);
#endif

	/* Verify that there is actually a CF in the slot. If not, then
	 * bail out back to the idle state and wake up all the waiters */
	status = ace_in32(ace, ACE_STATUS);
	if ((status & ACE_STATUS_CFDETECT) == 0) {
		ace->fsm_state = ACE_FSM_STATE_IDLE;
		ace->media_change = 1;
		set_capacity(ace->gd, 0);
		dev_info(ace->dev, "No CF in slot\n");

		/* Drop all in-flight and pending requests */
		if (ace->req) {
			__blk_end_request_all(ace->req, -EIO);
			ace->req = NULL;
		}
		while ((req = blk_fetch_request(ace->queue)) != NULL)
			__blk_end_request_all(req, -EIO);

		/* Drop back to IDLE state and notify waiters */
		ace->fsm_state = ACE_FSM_STATE_IDLE;
		ace->id_result = -EIO;
		while (ace->id_req_count) {
			complete(&ace->id_completion);
			ace->id_req_count--;
		}
	}

	switch (ace->fsm_state) {
	case ACE_FSM_STATE_IDLE:
		/* See if there is anything to do */
		if (ace->id_req_count || ace_get_next_request(ace->queue)) {
			ace->fsm_iter_num++;
			ace->fsm_state = ACE_FSM_STATE_REQ_LOCK;
			mod_timer(&ace->stall_timer, jiffies + HZ);
			if (!timer_pending(&ace->stall_timer))
				add_timer(&ace->stall_timer);
			break;
		}
		del_timer(&ace->stall_timer);
		ace->fsm_continue_flag = 0;
		break;

	case ACE_FSM_STATE_REQ_LOCK:
		if (ace_in(ace, ACE_STATUS) & ACE_STATUS_MPULOCK) {
			/* Already have the lock, jump to next state */
			ace->fsm_state = ACE_FSM_STATE_WAIT_CFREADY;
			break;
		}

		/* Request the lock */
		val = ace_in(ace, ACE_CTRL);
		ace_out(ace, ACE_CTRL, val | ACE_CTRL_LOCKREQ);
		ace->fsm_state = ACE_FSM_STATE_WAIT_LOCK;
		break;

	case ACE_FSM_STATE_WAIT_LOCK:
		if (ace_in(ace, ACE_STATUS) & ACE_STATUS_MPULOCK) {
			/* got the lock; move to next state */
			ace->fsm_state = ACE_FSM_STATE_WAIT_CFREADY;
			break;
		}

		/* wait a bit for the lock */
		ace_fsm_yield(ace);
		break;

	case ACE_FSM_STATE_WAIT_CFREADY:
		status = ace_in32(ace, ACE_STATUS);
		if (!(status & ACE_STATUS_RDYFORCFCMD) ||
		    (status & ACE_STATUS_CFBSY)) {
			/* CF card isn't ready; it needs to be polled */
			ace_fsm_yield(ace);
			break;
		}

		/* Device is ready for command; determine what to do next */
		if (ace->id_req_count)
			ace->fsm_state = ACE_FSM_STATE_IDENTIFY_PREPARE;
		else
			ace->fsm_state = ACE_FSM_STATE_REQ_PREPARE;
		break;

	case ACE_FSM_STATE_IDENTIFY_PREPARE:
		/* Send identify command */
		ace->fsm_task = ACE_TASK_IDENTIFY;
		ace->data_ptr = ace->cf_id;
		ace->data_count = ACE_BUF_PER_SECTOR;
		ace_out(ace, ACE_SECCNTCMD, ACE_SECCNTCMD_IDENTIFY);

		/* As per datasheet, put config controller in reset */
		val = ace_in(ace, ACE_CTRL);
		ace_out(ace, ACE_CTRL, val | ACE_CTRL_CFGRESET);

		/* irq handler takes over from this point; wait for the
		 * transfer to complete */
		ace->fsm_state = ACE_FSM_STATE_IDENTIFY_TRANSFER;
		ace_fsm_yieldirq(ace);
		break;

	case ACE_FSM_STATE_IDENTIFY_TRANSFER:
		/* Check that the sysace is ready to receive data */
		status = ace_in32(ace, ACE_STATUS);
		if (status & ACE_STATUS_CFBSY) {
			dev_dbg(ace->dev, "CFBSY set; t=%i iter=%i dc=%i\n",
				ace->fsm_task, ace->fsm_iter_num,
				ace->data_count);
			ace_fsm_yield(ace);
			break;
		}
		if (!(status & ACE_STATUS_DATABUFRDY)) {
			ace_fsm_yield(ace);
			break;
		}

		/* Transfer the next buffer */
		ace->reg_ops->datain(ace);
		ace->data_count--;

		/* If there are still buffers to be transfers; jump out here */
		if (ace->data_count != 0) {
			ace_fsm_yieldirq(ace);
			break;
		}

		/* transfer finished; kick state machine */
		dev_dbg(ace->dev, "identify finished\n");
		ace->fsm_state = ACE_FSM_STATE_IDENTIFY_COMPLETE;
		break;

	case ACE_FSM_STATE_IDENTIFY_COMPLETE:
		ace_fix_driveid(ace->cf_id);
		ace_dump_mem(ace->cf_id, 512);	/* Debug: Dump out disk ID */

		if (ace->data_result) {
			/* Error occured, disable the disk */
			ace->media_change = 1;
			set_capacity(ace->gd, 0);
			dev_err(ace->dev, "error fetching CF id (%i)\n",
				ace->data_result);
		} else {
			ace->media_change = 0;

			/* Record disk parameters */
			set_capacity(ace->gd,
				ata_id_u32(ace->cf_id, ATA_ID_LBA_CAPACITY));
			dev_info(ace->dev, "capacity: %i sectors\n",
				ata_id_u32(ace->cf_id, ATA_ID_LBA_CAPACITY));
		}

		/* We're done, drop to IDLE state and notify waiters */
		ace->fsm_state = ACE_FSM_STATE_IDLE;
		ace->id_result = ace->data_result;
		while (ace->id_req_count) {
			complete(&ace->id_completion);
			ace->id_req_count--;
		}
		break;

	case ACE_FSM_STATE_REQ_PREPARE:
		req = ace_get_next_request(ace->queue);
		if (!req) {
			ace->fsm_state = ACE_FSM_STATE_IDLE;
			break;
		}
		blk_start_request(req);

		/* Okay, it's a data request, set it up for transfer */
		dev_dbg(ace->dev,
			"request: sec=%llx hcnt=%x, ccnt=%x, dir=%i\n",
			(unsigned long long)blk_rq_pos(req),
			blk_rq_sectors(req), blk_rq_cur_sectors(req),
			rq_data_dir(req));

		ace->req = req;
		ace->data_ptr = req->buffer;
		ace->data_count = blk_rq_cur_sectors(req) * ACE_BUF_PER_SECTOR;
		ace_out32(ace, ACE_MPULBA, blk_rq_pos(req) & 0x0FFFFFFF);

		count = blk_rq_sectors(req);
		if (rq_data_dir(req)) {
			/* Kick off write request */
			dev_dbg(ace->dev, "write data\n");
			ace->fsm_task = ACE_TASK_WRITE;
			ace_out(ace, ACE_SECCNTCMD,
				count | ACE_SECCNTCMD_WRITE_DATA);
		} else {
			/* Kick off read request */
			dev_dbg(ace->dev, "read data\n");
			ace->fsm_task = ACE_TASK_READ;
			ace_out(ace, ACE_SECCNTCMD,
				count | ACE_SECCNTCMD_READ_DATA);
		}

		/* As per datasheet, put config controller in reset */
		val = ace_in(ace, ACE_CTRL);
		ace_out(ace, ACE_CTRL, val | ACE_CTRL_CFGRESET);

		/* Move to the transfer state.  The systemace will raise
		 * an interrupt once there is something to do
		 */
		ace->fsm_state = ACE_FSM_STATE_REQ_TRANSFER;
		if (ace->fsm_task == ACE_TASK_READ)
			ace_fsm_yieldirq(ace);	/* wait for data ready */
		break;

	case ACE_FSM_STATE_REQ_TRANSFER:
		/* Check that the sysace is ready to receive data */
		status = ace_in32(ace, ACE_STATUS);
		if (status & ACE_STATUS_CFBSY) {
			dev_dbg(ace->dev,
				"CFBSY set; t=%i iter=%i c=%i dc=%i irq=%i\n",
				ace->fsm_task, ace->fsm_iter_num,
				blk_rq_cur_sectors(ace->req) * 16,
				ace->data_count, ace->in_irq);
			ace_fsm_yield(ace);	/* need to poll CFBSY bit */
			break;
		}
		if (!(status & ACE_STATUS_DATABUFRDY)) {
			dev_dbg(ace->dev,
				"DATABUF not set; t=%i iter=%i c=%i dc=%i irq=%i\n",
				ace->fsm_task, ace->fsm_iter_num,
				blk_rq_cur_sectors(ace->req) * 16,
				ace->data_count, ace->in_irq);
			ace_fsm_yieldirq(ace);
			break;
		}

		/* Transfer the next buffer */
		if (ace->fsm_task == ACE_TASK_WRITE)
			ace->reg_ops->dataout(ace);
		else
			ace->reg_ops->datain(ace);
		ace->data_count--;

		/* If there are still buffers to be transfers; jump out here */
		if (ace->data_count != 0) {
			ace_fsm_yieldirq(ace);
			break;
		}

		/* bio finished; is there another one? */
		if (__blk_end_request_cur(ace->req, 0)) {
			/* dev_dbg(ace->dev, "next block; h=%u c=%u\n",
			 *      blk_rq_sectors(ace->req),
			 *      blk_rq_cur_sectors(ace->req));
			 */
			ace->data_ptr = ace->req->buffer;
			ace->data_count = blk_rq_cur_sectors(ace->req) * 16;
			ace_fsm_yieldirq(ace);
			break;
		}

		ace->fsm_state = ACE_FSM_STATE_REQ_COMPLETE;
		break;

	case ACE_FSM_STATE_REQ_COMPLETE:
		ace->req = NULL;

		/* Finished request; go to idle state */
		ace->fsm_state = ACE_FSM_STATE_IDLE;
		break;

	default:
		ace->fsm_state = ACE_FSM_STATE_IDLE;
		break;
	}
}

static void ace_fsm_tasklet(unsigned long data)
{
	struct ace_device *ace = (void *)data;
	unsigned long flags;

	spin_lock_irqsave(&ace->lock, flags);

	/* Loop over state machine until told to stop */
	ace->fsm_continue_flag = 1;
	while (ace->fsm_continue_flag)
		ace_fsm_dostate(ace);

	spin_unlock_irqrestore(&ace->lock, flags);
}

static void ace_stall_timer(unsigned long data)
{
	struct ace_device *ace = (void *)data;
	unsigned long flags;

	dev_warn(ace->dev,
		 "kicking stalled fsm; state=%i task=%i iter=%i dc=%i\n",
		 ace->fsm_state, ace->fsm_task, ace->fsm_iter_num,
		 ace->data_count);
	spin_lock_irqsave(&ace->lock, flags);

	/* Rearm the stall timer *before* entering FSM (which may then
	 * delete the timer) */
	mod_timer(&ace->stall_timer, jiffies + HZ);

	/* Loop over state machine until told to stop */
	ace->fsm_continue_flag = 1;
	while (ace->fsm_continue_flag)
		ace_fsm_dostate(ace);

	spin_unlock_irqrestore(&ace->lock, flags);
}

/* ---------------------------------------------------------------------
 * Interrupt handling routines
 */
static int ace_interrupt_checkstate(struct ace_device *ace)
{
	u32 sreg = ace_in32(ace, ACE_STATUS);
	u16 creg = ace_in(ace, ACE_CTRL);

	/* Check for error occurance */
	if ((sreg & (ACE_STATUS_CFGERROR | ACE_STATUS_CFCERROR)) &&
	    (creg & ACE_CTRL_ERRORIRQ)) {
		dev_err(ace->dev, "transfer failure\n");
		ace_dump_regs(ace);
		return -EIO;
	}

	return 0;
}

static irqreturn_t ace_interrupt(int irq, void *dev_id)
{
	u16 creg;
	struct ace_device *ace = dev_id;

	/* be safe and get the lock */
	spin_lock(&ace->lock);
	ace->in_irq = 1;

	/* clear the interrupt */
	creg = ace_in(ace, ACE_CTRL);
	ace_out(ace, ACE_CTRL, creg | ACE_CTRL_RESETIRQ);
	ace_out(ace, ACE_CTRL, creg);

	/* check for IO failures */
	if (ace_interrupt_checkstate(ace))
		ace->data_result = -EIO;

	if (ace->fsm_task == 0) {
		dev_err(ace->dev,
			"spurious irq; stat=%.8x ctrl=%.8x cmd=%.4x\n",
			ace_in32(ace, ACE_STATUS), ace_in32(ace, ACE_CTRL),
			ace_in(ace, ACE_SECCNTCMD));
		dev_err(ace->dev, "fsm_task=%i fsm_state=%i data_count=%i\n",
			ace->fsm_task, ace->fsm_state, ace->data_count);
	}

	/* Loop over state machine until told to stop */
	ace->fsm_continue_flag = 1;
	while (ace->fsm_continue_flag)
		ace_fsm_dostate(ace);

	/* done with interrupt; drop the lock */
	ace->in_irq = 0;
	spin_unlock(&ace->lock);

	return IRQ_HANDLED;
}

/* ---------------------------------------------------------------------
 * Block ops
 */
static void ace_request(struct request_queue * q)
{
	struct request *req;
	struct ace_device *ace;

	req = ace_get_next_request(q);

	if (req) {
		ace = req->rq_disk->private_data;
		tasklet_schedule(&ace->fsm_tasklet);
	}
}

static int ace_media_changed(struct gendisk *gd)
{
	struct ace_device *ace = gd->private_data;
	dev_dbg(ace->dev, "ace_media_changed(): %i\n", ace->media_change);

	return ace->media_change;
}

static int ace_revalidate_disk(struct gendisk *gd)
{
	struct ace_device *ace = gd->private_data;
	unsigned long flags;

	dev_dbg(ace->dev, "ace_revalidate_disk()\n");

	if (ace->media_change) {
		dev_dbg(ace->dev, "requesting cf id and scheduling tasklet\n");

		spin_lock_irqsave(&ace->lock, flags);
		ace->id_req_count++;
		spin_unlock_irqrestore(&ace->lock, flags);

		tasklet_schedule(&ace->fsm_tasklet);
		wait_for_completion(&ace->id_completion);
	}

	dev_dbg(ace->dev, "revalidate complete\n");
	return ace->id_result;
}

static int ace_open(struct block_device *bdev, fmode_t mode)
{
	struct ace_device *ace = bdev->bd_disk->private_data;
	unsigned long flags;

	dev_dbg(ace->dev, "ace_open() users=%i\n", ace->users + 1);

	spin_lock_irqsave(&ace->lock, flags);
	ace->users++;
	spin_unlock_irqrestore(&ace->lock, flags);

	check_disk_change(bdev);
	return 0;
}

static int ace_release(struct gendisk *disk, fmode_t mode)
{
	struct ace_device *ace = disk->private_data;
	unsigned long flags;
	u16 val;

	dev_dbg(ace->dev, "ace_release() users=%i\n", ace->users - 1);

	spin_lock_irqsave(&ace->lock, flags);
	ace->users--;
	if (ace->users == 0) {
		val = ace_in(ace, ACE_CTRL);
		ace_out(ace, ACE_CTRL, val & ~ACE_CTRL_LOCKREQ);
	}
	spin_unlock_irqrestore(&ace->lock, flags);
	return 0;
}

static int ace_getgeo(struct block_device *bdev, struct hd_geometry *geo)
{
	struct ace_device *ace = bdev->bd_disk->private_data;
	u16 *cf_id = ace->cf_id;

	dev_dbg(ace->dev, "ace_getgeo()\n");

	geo->heads	= cf_id[ATA_ID_HEADS];
	geo->sectors	= cf_id[ATA_ID_SECTORS];
	geo->cylinders	= cf_id[ATA_ID_CYLS];

	return 0;
}

static const struct block_device_operations ace_fops = {
	.owner = THIS_MODULE,
	.open = ace_open,
	.release = ace_release,
	.media_changed = ace_media_changed,
	.revalidate_disk = ace_revalidate_disk,
	.getgeo = ace_getgeo,
};

/* --------------------------------------------------------------------
 * SystemACE device setup/teardown code
 */
static int __devinit ace_setup(struct ace_device *ace)
{
	u16 version;
	u16 val;
	int rc;

	dev_dbg(ace->dev, "ace_setup(ace=0x%p)\n", ace);
	dev_dbg(ace->dev, "physaddr=0x%llx irq=%i\n",
		(unsigned long long)ace->physaddr, ace->irq);

	spin_lock_init(&ace->lock);
	init_completion(&ace->id_completion);

	/*
	 * Map the device
	 */
	ace->baseaddr = ioremap(ace->physaddr, 0x80);
	if (!ace->baseaddr)
		goto err_ioremap;

	/*
	 * Initialize the state machine tasklet and stall timer
	 */
	tasklet_init(&ace->fsm_tasklet, ace_fsm_tasklet, (unsigned long)ace);
	setup_timer(&ace->stall_timer, ace_stall_timer, (unsigned long)ace);

	/*
	 * Initialize the request queue
	 */
	ace->queue = blk_init_queue(ace_request, &ace->lock);
	if (ace->queue == NULL)
		goto err_blk_initq;
	blk_queue_logical_block_size(ace->queue, 512);

	/*
	 * Allocate and initialize GD structure
	 */
	ace->gd = alloc_disk(ACE_NUM_MINORS);
	if (!ace->gd)
		goto err_alloc_disk;

	ace->gd->major = ace_major;
	ace->gd->first_minor = ace->id * ACE_NUM_MINORS;
	ace->gd->fops = &ace_fops;
	ace->gd->queue = ace->queue;
	ace->gd->private_data = ace;
	snprintf(ace->gd->disk_name, 32, "xs%c", ace->id + 'a');

	/* set bus width */
	if (ace->bus_width == ACE_BUS_WIDTH_16) {
		/* 0x0101 should work regardless of endianess */
		ace_out_le16(ace, ACE_BUSMODE, 0x0101);

		/* read it back to determine endianess */
		if (ace_in_le16(ace, ACE_BUSMODE) == 0x0001)
			ace->reg_ops = &ace_reg_le16_ops;
		else
			ace->reg_ops = &ace_reg_be16_ops;
	} else {
		ace_out_8(ace, ACE_BUSMODE, 0x00);
		ace->reg_ops = &ace_reg_8_ops;
	}

	/* Make sure version register is sane */
	version = ace_in(ace, ACE_VERSION);
	if ((version == 0) || (version == 0xFFFF))
		goto err_read;

	/* Put sysace in a sane state by clearing most control reg bits */
	ace_out(ace, ACE_CTRL, ACE_CTRL_FORCECFGMODE |
		ACE_CTRL_DATABUFRDYIRQ | ACE_CTRL_ERRORIRQ);

	/* Now we can hook up the irq handler */
	if (ace->irq != NO_IRQ) {
		rc = request_irq(ace->irq, ace_interrupt, 0, "systemace", ace);
		if (rc) {
			/* Failure - fall back to polled mode */
			dev_err(ace->dev, "request_irq failed\n");
			ace->irq = NO_IRQ;
		}
	}

	/* Enable interrupts */
	val = ace_in(ace, ACE_CTRL);
	val |= ACE_CTRL_DATABUFRDYIRQ | ACE_CTRL_ERRORIRQ;
	ace_out(ace, ACE_CTRL, val);

	/* Print the identification */
	dev_info(ace->dev, "Xilinx SystemACE revision %i.%i.%i\n",
		 (version >> 12) & 0xf, (version >> 8) & 0x0f, version & 0xff);
	dev_dbg(ace->dev, "physaddr 0x%llx, mapped to 0x%p, irq=%i\n",
		(unsigned long long) ace->physaddr, ace->baseaddr, ace->irq);

	ace->media_change = 1;
	ace_revalidate_disk(ace->gd);

	/* Make the sysace device 'live' */
	add_disk(ace->gd);

	return 0;

err_read:
	put_disk(ace->gd);
err_alloc_disk:
	blk_cleanup_queue(ace->queue);
err_blk_initq:
	iounmap(ace->baseaddr);
err_ioremap:
	dev_info(ace->dev, "xsysace: error initializing device at 0x%llx\n",
		 (unsigned long long) ace->physaddr);
	return -ENOMEM;
}

static void __devexit ace_teardown(struct ace_device *ace)
{
	if (ace->gd) {
		del_gendisk(ace->gd);
		put_disk(ace->gd);
	}

	if (ace->queue)
		blk_cleanup_queue(ace->queue);

	tasklet_kill(&ace->fsm_tasklet);

	if (ace->irq != NO_IRQ)
		free_irq(ace->irq, ace);

	iounmap(ace->baseaddr);
}

static int __devinit
ace_alloc(struct device *dev, int id, resource_size_t physaddr,
	  int irq, int bus_width)
{
	struct ace_device *ace;
	int rc;
	dev_dbg(dev, "ace_alloc(%p)\n", dev);

	if (!physaddr) {
		rc = -ENODEV;
		goto err_noreg;
	}

	/* Allocate and initialize the ace device structure */
	ace = kzalloc(sizeof(struct ace_device), GFP_KERNEL);
	if (!ace) {
		rc = -ENOMEM;
		goto err_alloc;
	}

	ace->dev = dev;
	ace->id = id;
	ace->physaddr = physaddr;
	ace->irq = irq;
	ace->bus_width = bus_width;

	/* Call the setup code */
	rc = ace_setup(ace);
	if (rc)
		goto err_setup;

	dev_set_drvdata(dev, ace);
	return 0;

err_setup:
	dev_set_drvdata(dev, NULL);
	kfree(ace);
err_alloc:
err_noreg:
	dev_err(dev, "could not initialize device, err=%i\n", rc);
	return rc;
}

static void __devexit ace_free(struct device *dev)
{
	struct ace_device *ace = dev_get_drvdata(dev);
	dev_dbg(dev, "ace_free(%p)\n", dev);

	if (ace) {
		ace_teardown(ace);
		dev_set_drvdata(dev, NULL);
		kfree(ace);
	}
}

/* ---------------------------------------------------------------------
 * Platform Bus Support
 */

static int __devinit ace_probe(struct platform_device *dev)
{
	resource_size_t physaddr = 0;
	int bus_width = ACE_BUS_WIDTH_16; /* FIXME: should not be hard coded */
	int id = dev->id;
	int irq = NO_IRQ;
	int i;

	dev_dbg(&dev->dev, "ace_probe(%p)\n", dev);

	for (i = 0; i < dev->num_resources; i++) {
		if (dev->resource[i].flags & IORESOURCE_MEM)
			physaddr = dev->resource[i].start;
		if (dev->resource[i].flags & IORESOURCE_IRQ)
			irq = dev->resource[i].start;
	}

	/* Call the bus-independant setup code */
	return ace_alloc(&dev->dev, id, physaddr, irq, bus_width);
}

/*
 * Platform bus remove() method
 */
static int __devexit ace_remove(struct platform_device *dev)
{
	ace_free(&dev->dev);
	return 0;
}

static struct platform_driver ace_platform_driver = {
	.probe = ace_probe,
	.remove = __devexit_p(ace_remove),
	.driver = {
		.owner = THIS_MODULE,
		.name = "xsysace",
	},
};

/* ---------------------------------------------------------------------
 * OF_Platform Bus Support
 */

#if defined(CONFIG_OF)
static int __devinit
ace_of_probe(struct of_device *op, const struct of_device_id *match)
{
	struct resource res;
	resource_size_t physaddr;
	const u32 *id;
	int irq, bus_width, rc;

	dev_dbg(&op->dev, "ace_of_probe(%p, %p)\n", op, match);

	/* device id */
	id = of_get_property(op->node, "port-number", NULL);

	/* physaddr */
	rc = of_address_to_resource(op->node, 0, &res);
	if (rc) {
		dev_err(&op->dev, "invalid address\n");
		return rc;
	}
	physaddr = res.start;

	/* irq */
	irq = irq_of_parse_and_map(op->node, 0);

	/* bus width */
	bus_width = ACE_BUS_WIDTH_16;
	if (of_find_property(op->node, "8-bit", NULL))
		bus_width = ACE_BUS_WIDTH_8;

	/* Call the bus-independant setup code */
	return ace_alloc(&op->dev, id ? *id : 0, physaddr, irq, bus_width);
}

static int __devexit ace_of_remove(struct of_device *op)
{
	ace_free(&op->dev);
	return 0;
}

/* Match table for of_platform binding */
static struct of_device_id ace_of_match[] __devinitdata = {
	{ .compatible = "xlnx,opb-sysace-1.00.b", },
	{ .compatible = "xlnx,opb-sysace-1.00.c", },
	{ .compatible = "xlnx,xps-sysace-1.00.a", },
	{ .compatible = "xlnx,sysace", },
	{},
};
MODULE_DEVICE_TABLE(of, ace_of_match);

static struct of_platform_driver ace_of_driver = {
	.owner = THIS_MODULE,
	.name = "xsysace",
	.match_table = ace_of_match,
	.probe = ace_of_probe,
	.remove = __devexit_p(ace_of_remove),
	.driver = {
		.name = "xsysace",
	},
};

/* Registration helpers to keep the number of #ifdefs to a minimum */
static inline int __init ace_of_register(void)
{
	pr_debug("xsysace: registering OF binding\n");
	return of_register_platform_driver(&ace_of_driver);
}

static inline void __exit ace_of_unregister(void)
{
	of_unregister_platform_driver(&ace_of_driver);
}
#else /* CONFIG_OF */
/* CONFIG_OF not enabled; do nothing helpers */
static inline int __init ace_of_register(void) { return 0; }
static inline void __exit ace_of_unregister(void) { }
#endif /* CONFIG_OF */

/* ---------------------------------------------------------------------
 * Module init/exit routines
 */
static int __init ace_init(void)
{
	int rc;

	ace_major = register_blkdev(ace_major, "xsysace");
	if (ace_major <= 0) {
		rc = -ENOMEM;
		goto err_blk;
	}

	rc = ace_of_register();
	if (rc)
		goto err_of;

	pr_debug("xsysace: registering platform binding\n");
	rc = platform_driver_register(&ace_platform_driver);
	if (rc)
		goto err_plat;

	pr_info("Xilinx SystemACE device driver, major=%i\n", ace_major);
	return 0;

err_plat:
	ace_of_unregister();
err_of:
	unregister_blkdev(ace_major, "xsysace");
err_blk:
	printk(KERN_ERR "xsysace: registration failed; err=%i\n", rc);
	return rc;
}

static void __exit ace_exit(void)
{
	pr_debug("Unregistering Xilinx SystemACE driver\n");
	platform_driver_unregister(&ace_platform_driver);
	ace_of_unregister();
	unregister_blkdev(ace_major, "xsysace");
}

module_init(ace_init);
module_exit(ace_exit);