summaryrefslogtreecommitdiff
path: root/drivers/ata/sata_fsl.c
blob: fbd423ad23bbad7517f06ab7fff59b4050ec96e2 (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
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
/*
 * drivers/ata/sata_fsl.c
 *
 * Freescale 3.0Gbps SATA device driver
 *
 * Author: Ashish Kalra <ashish.kalra@freescale.com>
 * Li Yang <leoli@freescale.com>
 *
 * Copyright (c) 2006-2007 Freescale Semiconductor, Inc.
 *
 * 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.
 *
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/platform_device.h>

#include <scsi/scsi_host.h>
#include <scsi/scsi_cmnd.h>
#include <linux/libata.h>
#include <asm/io.h>
#include <linux/of_platform.h>

/* Controller information */
enum {
	SATA_FSL_QUEUE_DEPTH	= 16,
	SATA_FSL_MAX_PRD	= 63,
	SATA_FSL_MAX_PRD_USABLE	= SATA_FSL_MAX_PRD - 1,
	SATA_FSL_MAX_PRD_DIRECT	= 16,	/* Direct PRDT entries */

	SATA_FSL_HOST_FLAGS	= (ATA_FLAG_SATA | ATA_FLAG_NO_LEGACY |
				ATA_FLAG_MMIO | ATA_FLAG_PIO_DMA |
				ATA_FLAG_NCQ),
	SATA_FSL_HOST_LFLAGS	= ATA_LFLAG_SKIP_D2H_BSY,

	SATA_FSL_MAX_CMDS	= SATA_FSL_QUEUE_DEPTH,
	SATA_FSL_CMD_HDR_SIZE	= 16,	/* 4 DWORDS */
	SATA_FSL_CMD_SLOT_SIZE  = (SATA_FSL_MAX_CMDS * SATA_FSL_CMD_HDR_SIZE),

	/*
	 * SATA-FSL host controller supports a max. of (15+1) direct PRDEs, and
	 * chained indirect PRDEs upto a max count of 63.
	 * We are allocating an array of 63 PRDEs contigiously, but PRDE#15 will
	 * be setup as an indirect descriptor, pointing to it's next
	 * (contigious) PRDE. Though chained indirect PRDE arrays are
	 * supported,it will be more efficient to use a direct PRDT and
	 * a single chain/link to indirect PRDE array/PRDT.
	 */

	SATA_FSL_CMD_DESC_CFIS_SZ	= 32,
	SATA_FSL_CMD_DESC_SFIS_SZ	= 32,
	SATA_FSL_CMD_DESC_ACMD_SZ	= 16,
	SATA_FSL_CMD_DESC_RSRVD		= 16,

	SATA_FSL_CMD_DESC_SIZE	= (SATA_FSL_CMD_DESC_CFIS_SZ +
				 SATA_FSL_CMD_DESC_SFIS_SZ +
				 SATA_FSL_CMD_DESC_ACMD_SZ +
				 SATA_FSL_CMD_DESC_RSRVD +
				 SATA_FSL_MAX_PRD * 16),

	SATA_FSL_CMD_DESC_OFFSET_TO_PRDT	=
				(SATA_FSL_CMD_DESC_CFIS_SZ +
				 SATA_FSL_CMD_DESC_SFIS_SZ +
				 SATA_FSL_CMD_DESC_ACMD_SZ +
				 SATA_FSL_CMD_DESC_RSRVD),

	SATA_FSL_CMD_DESC_AR_SZ	= (SATA_FSL_CMD_DESC_SIZE * SATA_FSL_MAX_CMDS),
	SATA_FSL_PORT_PRIV_DMA_SZ = (SATA_FSL_CMD_SLOT_SIZE +
					SATA_FSL_CMD_DESC_AR_SZ),

	/*
	 * MPC8315 has two SATA controllers, SATA1 & SATA2
	 * (one port per controller)
	 * MPC837x has 2/4 controllers, one port per controller
	 */

	SATA_FSL_MAX_PORTS	= 1,

	SATA_FSL_IRQ_FLAG	= IRQF_SHARED,
};

/*
* Host Controller command register set - per port
*/
enum {
	CQ = 0,
	CA = 8,
	CC = 0x10,
	CE = 0x18,
	DE = 0x20,
	CHBA = 0x24,
	HSTATUS = 0x28,
	HCONTROL = 0x2C,
	CQPMP = 0x30,
	SIGNATURE = 0x34,
	ICC = 0x38,

	/*
	 * Host Status Register (HStatus) bitdefs
	 */
	ONLINE = (1 << 31),
	GOING_OFFLINE = (1 << 30),
	BIST_ERR = (1 << 29),

	FATAL_ERR_HC_MASTER_ERR = (1 << 18),
	FATAL_ERR_PARITY_ERR_TX = (1 << 17),
	FATAL_ERR_PARITY_ERR_RX = (1 << 16),
	FATAL_ERR_DATA_UNDERRUN = (1 << 13),
	FATAL_ERR_DATA_OVERRUN = (1 << 12),
	FATAL_ERR_CRC_ERR_TX = (1 << 11),
	FATAL_ERR_CRC_ERR_RX = (1 << 10),
	FATAL_ERR_FIFO_OVRFL_TX = (1 << 9),
	FATAL_ERR_FIFO_OVRFL_RX = (1 << 8),

	FATAL_ERROR_DECODE = FATAL_ERR_HC_MASTER_ERR |
	    FATAL_ERR_PARITY_ERR_TX |
	    FATAL_ERR_PARITY_ERR_RX |
	    FATAL_ERR_DATA_UNDERRUN |
	    FATAL_ERR_DATA_OVERRUN |
	    FATAL_ERR_CRC_ERR_TX |
	    FATAL_ERR_CRC_ERR_RX |
	    FATAL_ERR_FIFO_OVRFL_TX | FATAL_ERR_FIFO_OVRFL_RX,

	INT_ON_FATAL_ERR = (1 << 5),
	INT_ON_PHYRDY_CHG = (1 << 4),

	INT_ON_SIGNATURE_UPDATE = (1 << 3),
	INT_ON_SNOTIFY_UPDATE = (1 << 2),
	INT_ON_SINGL_DEVICE_ERR = (1 << 1),
	INT_ON_CMD_COMPLETE = 1,

	INT_ON_ERROR = INT_ON_FATAL_ERR |
	    INT_ON_PHYRDY_CHG | INT_ON_SINGL_DEVICE_ERR,

	/*
	 * Host Control Register (HControl) bitdefs
	 */
	HCONTROL_ONLINE_PHY_RST = (1 << 31),
	HCONTROL_FORCE_OFFLINE = (1 << 30),
	HCONTROL_PARITY_PROT_MOD = (1 << 14),
	HCONTROL_DPATH_PARITY = (1 << 12),
	HCONTROL_SNOOP_ENABLE = (1 << 10),
	HCONTROL_PMP_ATTACHED = (1 << 9),
	HCONTROL_COPYOUT_STATFIS = (1 << 8),
	IE_ON_FATAL_ERR = (1 << 5),
	IE_ON_PHYRDY_CHG = (1 << 4),
	IE_ON_SIGNATURE_UPDATE = (1 << 3),
	IE_ON_SNOTIFY_UPDATE = (1 << 2),
	IE_ON_SINGL_DEVICE_ERR = (1 << 1),
	IE_ON_CMD_COMPLETE = 1,

	DEFAULT_PORT_IRQ_ENABLE_MASK = IE_ON_FATAL_ERR | IE_ON_PHYRDY_CHG |
	    IE_ON_SIGNATURE_UPDATE |
	    IE_ON_SINGL_DEVICE_ERR | IE_ON_CMD_COMPLETE,

	EXT_INDIRECT_SEG_PRD_FLAG = (1 << 31),
	DATA_SNOOP_ENABLE = (1 << 22),
};

/*
 * SATA Superset Registers
 */
enum {
	SSTATUS = 0,
	SERROR = 4,
	SCONTROL = 8,
	SNOTIFY = 0xC,
};

/*
 * Control Status Register Set
 */
enum {
	TRANSCFG = 0,
	TRANSSTATUS = 4,
	LINKCFG = 8,
	LINKCFG1 = 0xC,
	LINKCFG2 = 0x10,
	LINKSTATUS = 0x14,
	LINKSTATUS1 = 0x18,
	PHYCTRLCFG = 0x1C,
	COMMANDSTAT = 0x20,
};

/* PHY (link-layer) configuration control */
enum {
	PHY_BIST_ENABLE = 0x01,
};

/*
 * Command Header Table entry, i.e, command slot
 * 4 Dwords per command slot, command header size ==  64 Dwords.
 */
struct cmdhdr_tbl_entry {
	u32 cda;
	u32 prde_fis_len;
	u32 ttl;
	u32 desc_info;
};

/*
 * Description information bitdefs
 */
enum {
	VENDOR_SPECIFIC_BIST = (1 << 10),
	CMD_DESC_SNOOP_ENABLE = (1 << 9),
	FPDMA_QUEUED_CMD = (1 << 8),
	SRST_CMD = (1 << 7),
	BIST = (1 << 6),
	ATAPI_CMD = (1 << 5),
};

/*
 * Command Descriptor
 */
struct command_desc {
	u8 cfis[8 * 4];
	u8 sfis[8 * 4];
	u8 acmd[4 * 4];
	u8 fill[4 * 4];
	u32 prdt[SATA_FSL_MAX_PRD_DIRECT * 4];
	u32 prdt_indirect[(SATA_FSL_MAX_PRD - SATA_FSL_MAX_PRD_DIRECT) * 4];
};

/*
 * Physical region table descriptor(PRD)
 */

struct prde {
	u32 dba;
	u8 fill[2 * 4];
	u32 ddc_and_ext;
};

/*
 * ata_port private data
 * This is our per-port instance data.
 */
struct sata_fsl_port_priv {
	struct cmdhdr_tbl_entry *cmdslot;
	dma_addr_t cmdslot_paddr;
	struct command_desc *cmdentry;
	dma_addr_t cmdentry_paddr;

	/*
	 * SATA FSL controller has a Status FIS which should contain the
	 * received D2H FIS & taskfile registers. This SFIS is present in
	 * the command descriptor, and to have a ready reference to it,
	 * we are caching it here, quite similar to what is done in H/W on
	 * AHCI compliant devices by copying taskfile fields to a 32-bit
	 * register.
	 */

	struct ata_taskfile tf;
};

/*
 * ata_port->host_set private data
 */
struct sata_fsl_host_priv {
	void __iomem *hcr_base;
	void __iomem *ssr_base;
	void __iomem *csr_base;
	int irq;
};

static inline unsigned int sata_fsl_tag(unsigned int tag,
					void __iomem *hcr_base)
{
	/* We let libATA core do actual (queue) tag allocation */

	/* all non NCQ/queued commands should have tag#0 */
	if (ata_tag_internal(tag)) {
		DPRINTK("mapping internal cmds to tag#0\n");
		return 0;
	}

	if (unlikely(tag >= SATA_FSL_QUEUE_DEPTH)) {
		DPRINTK("tag %d invalid : out of range\n", tag);
		return 0;
	}

	if (unlikely((ioread32(hcr_base + CQ)) & (1 << tag))) {
		DPRINTK("tag %d invalid : in use!!\n", tag);
		return 0;
	}

	return tag;
}

static void sata_fsl_setup_cmd_hdr_entry(struct sata_fsl_port_priv *pp,
					 unsigned int tag, u32 desc_info,
					 u32 data_xfer_len, u8 num_prde,
					 u8 fis_len)
{
	dma_addr_t cmd_descriptor_address;

	cmd_descriptor_address = pp->cmdentry_paddr +
	    tag * SATA_FSL_CMD_DESC_SIZE;

	/* NOTE: both data_xfer_len & fis_len are Dword counts */

	pp->cmdslot[tag].cda = cpu_to_le32(cmd_descriptor_address);
	pp->cmdslot[tag].prde_fis_len =
	    cpu_to_le32((num_prde << 16) | (fis_len << 2));
	pp->cmdslot[tag].ttl = cpu_to_le32(data_xfer_len & ~0x03);
	pp->cmdslot[tag].desc_info = cpu_to_le32(desc_info | (tag & 0x1F));

	VPRINTK("cda=0x%x, prde_fis_len=0x%x, ttl=0x%x, di=0x%x\n",
		pp->cmdslot[tag].cda,
		pp->cmdslot[tag].prde_fis_len,
		pp->cmdslot[tag].ttl, pp->cmdslot[tag].desc_info);

}

static unsigned int sata_fsl_fill_sg(struct ata_queued_cmd *qc, void *cmd_desc,
				     u32 *ttl, dma_addr_t cmd_desc_paddr)
{
	struct scatterlist *sg;
	unsigned int num_prde = 0;
	u32 ttl_dwords = 0;

	/*
	 * NOTE : direct & indirect prdt's are contigiously allocated
	 */
	struct prde *prd = (struct prde *)&((struct command_desc *)
					    cmd_desc)->prdt;

	struct prde *prd_ptr_to_indirect_ext = NULL;
	unsigned indirect_ext_segment_sz = 0;
	dma_addr_t indirect_ext_segment_paddr;
	unsigned int si;

	VPRINTK("SATA FSL : cd = 0x%p, prd = 0x%p\n", cmd_desc, prd);

	indirect_ext_segment_paddr = cmd_desc_paddr +
	    SATA_FSL_CMD_DESC_OFFSET_TO_PRDT + SATA_FSL_MAX_PRD_DIRECT * 16;

	for_each_sg(qc->sg, sg, qc->n_elem, si) {
		dma_addr_t sg_addr = sg_dma_address(sg);
		u32 sg_len = sg_dma_len(sg);

		VPRINTK("SATA FSL : fill_sg, sg_addr = 0x%x, sg_len = %d\n",
			sg_addr, sg_len);

		/* warn if each s/g element is not dword aligned */
		if (sg_addr & 0x03)
			ata_port_printk(qc->ap, KERN_ERR,
					"s/g addr unaligned : 0x%x\n", sg_addr);
		if (sg_len & 0x03)
			ata_port_printk(qc->ap, KERN_ERR,
					"s/g len unaligned : 0x%x\n", sg_len);

		if (num_prde == (SATA_FSL_MAX_PRD_DIRECT - 1) &&
		    sg_next(sg) != NULL) {
			VPRINTK("setting indirect prde\n");
			prd_ptr_to_indirect_ext = prd;
			prd->dba = cpu_to_le32(indirect_ext_segment_paddr);
			indirect_ext_segment_sz = 0;
			++prd;
			++num_prde;
		}

		ttl_dwords += sg_len;
		prd->dba = cpu_to_le32(sg_addr);
		prd->ddc_and_ext =
		    cpu_to_le32(DATA_SNOOP_ENABLE | (sg_len & ~0x03));

		VPRINTK("sg_fill, ttl=%d, dba=0x%x, ddc=0x%x\n",
			ttl_dwords, prd->dba, prd->ddc_and_ext);

		++num_prde;
		++prd;
		if (prd_ptr_to_indirect_ext)
			indirect_ext_segment_sz += sg_len;
	}

	if (prd_ptr_to_indirect_ext) {
		/* set indirect extension flag along with indirect ext. size */
		prd_ptr_to_indirect_ext->ddc_and_ext =
		    cpu_to_le32((EXT_INDIRECT_SEG_PRD_FLAG |
				 DATA_SNOOP_ENABLE |
				 (indirect_ext_segment_sz & ~0x03)));
	}

	*ttl = ttl_dwords;
	return num_prde;
}

static void sata_fsl_qc_prep(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;
	struct sata_fsl_port_priv *pp = ap->private_data;
	struct sata_fsl_host_priv *host_priv = ap->host->private_data;
	void __iomem *hcr_base = host_priv->hcr_base;
	unsigned int tag = sata_fsl_tag(qc->tag, hcr_base);
	struct command_desc *cd;
	u32 desc_info = CMD_DESC_SNOOP_ENABLE;
	u32 num_prde = 0;
	u32 ttl_dwords = 0;
	dma_addr_t cd_paddr;

	cd = (struct command_desc *)pp->cmdentry + tag;
	cd_paddr = pp->cmdentry_paddr + tag * SATA_FSL_CMD_DESC_SIZE;

	ata_tf_to_fis(&qc->tf, 0, 1, (u8 *) &cd->cfis);

	VPRINTK("Dumping cfis : 0x%x, 0x%x, 0x%x\n",
		cd->cfis[0], cd->cfis[1], cd->cfis[2]);

	if (qc->tf.protocol == ATA_PROT_NCQ) {
		VPRINTK("FPDMA xfer,Sctor cnt[0:7],[8:15] = %d,%d\n",
			cd->cfis[3], cd->cfis[11]);
	}

	/* setup "ACMD - atapi command" in cmd. desc. if this is ATAPI cmd */
	if (ata_is_atapi(qc->tf.protocol)) {
		desc_info |= ATAPI_CMD;
		memset((void *)&cd->acmd, 0, 32);
		memcpy((void *)&cd->acmd, qc->cdb, qc->dev->cdb_len);
	}

	if (qc->flags & ATA_QCFLAG_DMAMAP)
		num_prde = sata_fsl_fill_sg(qc, (void *)cd,
					    &ttl_dwords, cd_paddr);

	if (qc->tf.protocol == ATA_PROT_NCQ)
		desc_info |= FPDMA_QUEUED_CMD;

	sata_fsl_setup_cmd_hdr_entry(pp, tag, desc_info, ttl_dwords,
				     num_prde, 5);

	VPRINTK("SATA FSL : xx_qc_prep, di = 0x%x, ttl = %d, num_prde = %d\n",
		desc_info, ttl_dwords, num_prde);
}

static unsigned int sata_fsl_qc_issue(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;
	struct sata_fsl_host_priv *host_priv = ap->host->private_data;
	void __iomem *hcr_base = host_priv->hcr_base;
	unsigned int tag = sata_fsl_tag(qc->tag, hcr_base);

	VPRINTK("xx_qc_issue called,CQ=0x%x,CA=0x%x,CE=0x%x,CC=0x%x\n",
		ioread32(CQ + hcr_base),
		ioread32(CA + hcr_base),
		ioread32(CE + hcr_base), ioread32(CC + hcr_base));

	/* Simply queue command to the controller/device */
	iowrite32(1 << tag, CQ + hcr_base);

	VPRINTK("xx_qc_issue called, tag=%d, CQ=0x%x, CA=0x%x\n",
		tag, ioread32(CQ + hcr_base), ioread32(CA + hcr_base));

	VPRINTK("CE=0x%x, DE=0x%x, CC=0x%x, CmdStat = 0x%x\n",
		ioread32(CE + hcr_base),
		ioread32(DE + hcr_base),
		ioread32(CC + hcr_base),
		ioread32(COMMANDSTAT + host_priv->csr_base));

	return 0;
}

static int sata_fsl_scr_write(struct ata_port *ap, unsigned int sc_reg_in,
			       u32 val)
{
	struct sata_fsl_host_priv *host_priv = ap->host->private_data;
	void __iomem *ssr_base = host_priv->ssr_base;
	unsigned int sc_reg;

	switch (sc_reg_in) {
	case SCR_STATUS:
	case SCR_ERROR:
	case SCR_CONTROL:
	case SCR_ACTIVE:
		sc_reg = sc_reg_in;
		break;
	default:
		return -EINVAL;
	}

	VPRINTK("xx_scr_write, reg_in = %d\n", sc_reg);

	iowrite32(val, ssr_base + (sc_reg * 4));
	return 0;
}

static int sata_fsl_scr_read(struct ata_port *ap, unsigned int sc_reg_in,
			u32 *val)
{
	struct sata_fsl_host_priv *host_priv = ap->host->private_data;
	void __iomem *ssr_base = host_priv->ssr_base;
	unsigned int sc_reg;

	switch (sc_reg_in) {
	case SCR_STATUS:
	case SCR_ERROR:
	case SCR_CONTROL:
	case SCR_ACTIVE:
		sc_reg = sc_reg_in;
		break;
	default:
		return -EINVAL;
	}

	VPRINTK("xx_scr_read, reg_in = %d\n", sc_reg);

	*val = ioread32(ssr_base + (sc_reg * 4));
	return 0;
}

static void sata_fsl_freeze(struct ata_port *ap)
{
	struct sata_fsl_host_priv *host_priv = ap->host->private_data;
	void __iomem *hcr_base = host_priv->hcr_base;
	u32 temp;

	VPRINTK("xx_freeze, CQ=0x%x, CA=0x%x, CE=0x%x, DE=0x%x\n",
		ioread32(CQ + hcr_base),
		ioread32(CA + hcr_base),
		ioread32(CE + hcr_base), ioread32(DE + hcr_base));
	VPRINTK("CmdStat = 0x%x\n",
		ioread32(host_priv->csr_base + COMMANDSTAT));

	/* disable interrupts on the controller/port */
	temp = ioread32(hcr_base + HCONTROL);
	iowrite32((temp & ~0x3F), hcr_base + HCONTROL);

	VPRINTK("in xx_freeze : HControl = 0x%x, HStatus = 0x%x\n",
		ioread32(hcr_base + HCONTROL), ioread32(hcr_base + HSTATUS));
}

static void sata_fsl_thaw(struct ata_port *ap)
{
	struct sata_fsl_host_priv *host_priv = ap->host->private_data;
	void __iomem *hcr_base = host_priv->hcr_base;
	u32 temp;

	/* ack. any pending IRQs for this controller/port */
	temp = ioread32(hcr_base + HSTATUS);

	VPRINTK("xx_thaw, pending IRQs = 0x%x\n", (temp & 0x3F));

	if (temp & 0x3F)
		iowrite32((temp & 0x3F), hcr_base + HSTATUS);

	/* enable interrupts on the controller/port */
	temp = ioread32(hcr_base + HCONTROL);
	iowrite32((temp | DEFAULT_PORT_IRQ_ENABLE_MASK), hcr_base + HCONTROL);

	VPRINTK("xx_thaw : HControl = 0x%x, HStatus = 0x%x\n",
		ioread32(hcr_base + HCONTROL), ioread32(hcr_base + HSTATUS));
}

/*
 * NOTE : 1st D2H FIS from device does not update sfis in command descriptor.
 */
static inline void sata_fsl_cache_taskfile_from_d2h_fis(struct ata_queued_cmd
							*qc,
							struct ata_port *ap)
{
	struct sata_fsl_port_priv *pp = ap->private_data;
	struct sata_fsl_host_priv *host_priv = ap->host->private_data;
	void __iomem *hcr_base = host_priv->hcr_base;
	unsigned int tag = sata_fsl_tag(qc->tag, hcr_base);
	struct command_desc *cd;

	cd = pp->cmdentry + tag;

	ata_tf_from_fis(cd->sfis, &pp->tf);
}

static u8 sata_fsl_check_status(struct ata_port *ap)
{
	struct sata_fsl_port_priv *pp = ap->private_data;

	return pp->tf.command;
}

static void sata_fsl_tf_read(struct ata_port *ap, struct ata_taskfile *tf)
{
	struct sata_fsl_port_priv *pp = ap->private_data;

	*tf = pp->tf;
}

static int sata_fsl_port_start(struct ata_port *ap)
{
	struct device *dev = ap->host->dev;
	struct sata_fsl_port_priv *pp;
	int retval;
	void *mem;
	dma_addr_t mem_dma;
	struct sata_fsl_host_priv *host_priv = ap->host->private_data;
	void __iomem *hcr_base = host_priv->hcr_base;
	u32 temp;

	pp = kzalloc(sizeof(*pp), GFP_KERNEL);
	if (!pp)
		return -ENOMEM;

	mem = dma_alloc_coherent(dev, SATA_FSL_PORT_PRIV_DMA_SZ, &mem_dma,
				 GFP_KERNEL);
	if (!mem) {
		kfree(pp);
		return -ENOMEM;
	}
	memset(mem, 0, SATA_FSL_PORT_PRIV_DMA_SZ);

	pp->cmdslot = mem;
	pp->cmdslot_paddr = mem_dma;

	mem += SATA_FSL_CMD_SLOT_SIZE;
	mem_dma += SATA_FSL_CMD_SLOT_SIZE;

	pp->cmdentry = mem;
	pp->cmdentry_paddr = mem_dma;

	ap->private_data = pp;

	VPRINTK("CHBA = 0x%x, cmdentry_phys = 0x%x\n",
		pp->cmdslot_paddr, pp->cmdentry_paddr);

	/* Now, update the CHBA register in host controller cmd register set */
	iowrite32(pp->cmdslot_paddr & 0xffffffff, hcr_base + CHBA);

	/*
	 * Now, we can bring the controller on-line & also initiate
	 * the COMINIT sequence, we simply return here and the boot-probing
	 * & device discovery process is re-initiated by libATA using a
	 * Softreset EH (dummy) session. Hence, boot probing and device
	 * discovey will be part of sata_fsl_softreset() callback.
	 */

	temp = ioread32(hcr_base + HCONTROL);
	iowrite32((temp | HCONTROL_ONLINE_PHY_RST), hcr_base + HCONTROL);

	VPRINTK("HStatus = 0x%x\n", ioread32(hcr_base + HSTATUS));
	VPRINTK("HControl = 0x%x\n", ioread32(hcr_base + HCONTROL));
	VPRINTK("CHBA  = 0x%x\n", ioread32(hcr_base + CHBA));

#ifdef CONFIG_MPC8315_DS
	/*
	 * Workaround for 8315DS board 3gbps link-up issue,
	 * currently limit SATA port to GEN1 speed
	 */
	sata_fsl_scr_read(ap, SCR_CONTROL, &temp);
	temp &= ~(0xF << 4);
	temp |= (0x1 << 4);
	sata_fsl_scr_write(ap, SCR_CONTROL, temp);

	sata_fsl_scr_read(ap, SCR_CONTROL, &temp);
	dev_printk(KERN_WARNING, dev, "scr_control, speed limited to %x\n",
			temp);
#endif

	return 0;
}

static void sata_fsl_port_stop(struct ata_port *ap)
{
	struct device *dev = ap->host->dev;
	struct sata_fsl_port_priv *pp = ap->private_data;
	struct sata_fsl_host_priv *host_priv = ap->host->private_data;
	void __iomem *hcr_base = host_priv->hcr_base;
	u32 temp;

	/*
	 * Force host controller to go off-line, aborting current operations
	 */
	temp = ioread32(hcr_base + HCONTROL);
	temp &= ~HCONTROL_ONLINE_PHY_RST;
	temp |= HCONTROL_FORCE_OFFLINE;
	iowrite32(temp, hcr_base + HCONTROL);

	/* Poll for controller to go offline - should happen immediately */
	ata_wait_register(hcr_base + HSTATUS, ONLINE, ONLINE, 1, 1);

	ap->private_data = NULL;
	dma_free_coherent(dev, SATA_FSL_PORT_PRIV_DMA_SZ,
			  pp->cmdslot, pp->cmdslot_paddr);

	kfree(pp);
}

static unsigned int sata_fsl_dev_classify(struct ata_port *ap)
{
	struct sata_fsl_host_priv *host_priv = ap->host->private_data;
	void __iomem *hcr_base = host_priv->hcr_base;
	struct ata_taskfile tf;
	u32 temp;

	temp = ioread32(hcr_base + SIGNATURE);

	VPRINTK("raw sig = 0x%x\n", temp);
	VPRINTK("HStatus = 0x%x\n", ioread32(hcr_base + HSTATUS));
	VPRINTK("HControl = 0x%x\n", ioread32(hcr_base + HCONTROL));

	tf.lbah = (temp >> 24) & 0xff;
	tf.lbam = (temp >> 16) & 0xff;
	tf.lbal = (temp >> 8) & 0xff;
	tf.nsect = temp & 0xff;

	return ata_dev_classify(&tf);
}

static int sata_fsl_softreset(struct ata_link *link, unsigned int *class,
			      unsigned long deadline)
{
	struct ata_port *ap = link->ap;
	struct sata_fsl_port_priv *pp = ap->private_data;
	struct sata_fsl_host_priv *host_priv = ap->host->private_data;
	void __iomem *hcr_base = host_priv->hcr_base;
	u32 temp;
	struct ata_taskfile tf;
	u8 *cfis;
	u32 Serror;
	int i = 0;
	unsigned long start_jiffies;

	DPRINTK("in xx_softreset\n");

try_offline_again:
	/*
	 * Force host controller to go off-line, aborting current operations
	 */
	temp = ioread32(hcr_base + HCONTROL);
	temp &= ~HCONTROL_ONLINE_PHY_RST;
	iowrite32(temp, hcr_base + HCONTROL);

	/* Poll for controller to go offline */
	temp = ata_wait_register(hcr_base + HSTATUS, ONLINE, ONLINE, 1, 500);

	if (temp & ONLINE) {
		ata_port_printk(ap, KERN_ERR,
				"Softreset failed, not off-lined %d\n", i);

		/*
		 * Try to offline controller atleast twice
		 */
		i++;
		if (i == 2)
			goto err;
		else
			goto try_offline_again;
	}

	DPRINTK("softreset, controller off-lined\n");
	VPRINTK("HStatus = 0x%x\n", ioread32(hcr_base + HSTATUS));
	VPRINTK("HControl = 0x%x\n", ioread32(hcr_base + HCONTROL));

	/*
	 * PHY reset should remain asserted for atleast 1ms
	 */
	msleep(1);

	/*
	 * Now, bring the host controller online again, this can take time
	 * as PHY reset and communication establishment, 1st D2H FIS and
	 * device signature update is done, on safe side assume 500ms
	 * NOTE : Host online status may be indicated immediately!!
	 */

	temp = ioread32(hcr_base + HCONTROL);
	temp |= (HCONTROL_ONLINE_PHY_RST | HCONTROL_SNOOP_ENABLE);
	iowrite32(temp, hcr_base + HCONTROL);

	temp = ata_wait_register(hcr_base + HSTATUS, ONLINE, 0, 1, 500);

	if (!(temp & ONLINE)) {
		ata_port_printk(ap, KERN_ERR,
				"Softreset failed, not on-lined\n");
		goto err;
	}

	DPRINTK("softreset, controller off-lined & on-lined\n");
	VPRINTK("HStatus = 0x%x\n", ioread32(hcr_base + HSTATUS));
	VPRINTK("HControl = 0x%x\n", ioread32(hcr_base + HCONTROL));

	/*
	 * First, wait for the PHYRDY change to occur before waiting for
	 * the signature, and also verify if SStatus indicates device
	 * presence
	 */

	temp = ata_wait_register(hcr_base + HSTATUS, 0xFF, 0, 1, 500);
	if ((!(temp & 0x10)) || ata_link_offline(link)) {
		ata_port_printk(ap, KERN_WARNING,
				"No Device OR PHYRDY change,Hstatus = 0x%x\n",
				ioread32(hcr_base + HSTATUS));
		goto err;
	}

	/*
	 * Wait for the first D2H from device,i.e,signature update notification
	 */
	start_jiffies = jiffies;
	temp = ata_wait_register(hcr_base + HSTATUS, 0xFF, 0x10,
			500, jiffies_to_msecs(deadline - start_jiffies));

	if ((temp & 0xFF) != 0x18) {
		ata_port_printk(ap, KERN_WARNING, "No Signature Update\n");
		goto err;
	} else {
		ata_port_printk(ap, KERN_INFO,
				"Signature Update detected @ %d msecs\n",
				jiffies_to_msecs(jiffies - start_jiffies));
	}

	/*
	 * Send a device reset (SRST) explicitly on command slot #0
	 * Check : will the command queue (reg) be cleared during offlining ??
	 * Also we will be online only if Phy commn. has been established
	 * and device presence has been detected, therefore if we have
	 * reached here, we can send a command to the target device
	 */

	DPRINTK("Sending SRST/device reset\n");

	ata_tf_init(link->device, &tf);
	cfis = (u8 *) &pp->cmdentry->cfis;

	/* device reset/SRST is a control register update FIS, uses tag0 */
	sata_fsl_setup_cmd_hdr_entry(pp, 0,
				     SRST_CMD | CMD_DESC_SNOOP_ENABLE, 0, 0, 5);

	tf.ctl |= ATA_SRST;	/* setup SRST bit in taskfile control reg */
	ata_tf_to_fis(&tf, 0, 0, cfis);

	DPRINTK("Dumping cfis : 0x%x, 0x%x, 0x%x, 0x%x\n",
		cfis[0], cfis[1], cfis[2], cfis[3]);

	/*
	 * Queue SRST command to the controller/device, ensure that no
	 * other commands are active on the controller/device
	 */

	DPRINTK("@Softreset, CQ = 0x%x, CA = 0x%x, CC = 0x%x\n",
		ioread32(CQ + hcr_base),
		ioread32(CA + hcr_base), ioread32(CC + hcr_base));

	iowrite32(0xFFFF, CC + hcr_base);
	iowrite32(1, CQ + hcr_base);

	temp = ata_wait_register(CQ + hcr_base, 0x1, 0x1, 1, 5000);
	if (temp & 0x1) {
		ata_port_printk(ap, KERN_WARNING, "ATA_SRST issue failed\n");

		DPRINTK("Softreset@5000,CQ=0x%x,CA=0x%x,CC=0x%x\n",
			ioread32(CQ + hcr_base),
			ioread32(CA + hcr_base), ioread32(CC + hcr_base));

		sata_fsl_scr_read(ap, SCR_ERROR, &Serror);

		DPRINTK("HStatus = 0x%x\n", ioread32(hcr_base + HSTATUS));
		DPRINTK("HControl = 0x%x\n", ioread32(hcr_base + HCONTROL));
		DPRINTK("Serror = 0x%x\n", Serror);
		goto err;
	}

	msleep(1);

	/*
	 * SATA device enters reset state after receving a Control register
	 * FIS with SRST bit asserted and it awaits another H2D Control reg.
	 * FIS with SRST bit cleared, then the device does internal diags &
	 * initialization, followed by indicating it's initialization status
	 * using ATA signature D2H register FIS to the host controller.
	 */

	sata_fsl_setup_cmd_hdr_entry(pp, 0, CMD_DESC_SNOOP_ENABLE, 0, 0, 5);

	tf.ctl &= ~ATA_SRST;	/* 2nd H2D Ctl. register FIS */
	ata_tf_to_fis(&tf, 0, 0, cfis);

	iowrite32(1, CQ + hcr_base);
	msleep(150);		/* ?? */

	/*
	 * The above command would have signalled an interrupt on command
	 * complete, which needs special handling, by clearing the Nth
	 * command bit of the CCreg
	 */
	iowrite32(0x01, CC + hcr_base);	/* We know it will be cmd#0 always */

	DPRINTK("SATA FSL : Now checking device signature\n");

	*class = ATA_DEV_NONE;

	/* Verify if SStatus indicates device presence */
	if (ata_link_online(link)) {
		/*
		 * if we are here, device presence has been detected,
		 * 1st D2H FIS would have been received, but sfis in
		 * command desc. is not updated, but signature register
		 * would have been updated
		 */

		*class = sata_fsl_dev_classify(ap);

		DPRINTK("class = %d\n", *class);
		VPRINTK("ccreg = 0x%x\n", ioread32(hcr_base + CC));
		VPRINTK("cereg = 0x%x\n", ioread32(hcr_base + CE));
	}

	return 0;

err:
	return -EIO;
}

static void sata_fsl_error_handler(struct ata_port *ap)
{

	DPRINTK("in xx_error_handler\n");

	/* perform recovery */
	ata_do_eh(ap, ata_std_prereset, sata_fsl_softreset, sata_std_hardreset,
		  ata_std_postreset);
}

static void sata_fsl_post_internal_cmd(struct ata_queued_cmd *qc)
{
	if (qc->flags & ATA_QCFLAG_FAILED)
		qc->err_mask |= AC_ERR_OTHER;

	if (qc->err_mask) {
		/* make DMA engine forget about the failed command */

	}
}

static void sata_fsl_irq_clear(struct ata_port *ap)
{
	/* unused */
}

static void sata_fsl_error_intr(struct ata_port *ap)
{
	struct ata_link *link = &ap->link;
	struct ata_eh_info *ehi = &link->eh_info;
	struct sata_fsl_host_priv *host_priv = ap->host->private_data;
	void __iomem *hcr_base = host_priv->hcr_base;
	u32 hstatus, dereg, cereg = 0, SError = 0;
	unsigned int err_mask = 0, action = 0;
	struct ata_queued_cmd *qc;
	int freeze = 0;

	hstatus = ioread32(hcr_base + HSTATUS);
	cereg = ioread32(hcr_base + CE);

	ata_ehi_clear_desc(ehi);

	/*
	 * Handle & Clear SError
	 */

	sata_fsl_scr_read(ap, SCR_ERROR, &SError);
	if (unlikely(SError & 0xFFFF0000)) {
		sata_fsl_scr_write(ap, SCR_ERROR, SError);
		err_mask |= AC_ERR_ATA_BUS;
	}

	DPRINTK("error_intr,hStat=0x%x,CE=0x%x,DE =0x%x,SErr=0x%x\n",
		hstatus, cereg, ioread32(hcr_base + DE), SError);

	/* handle single device errors */
	if (cereg) {
		/*
		 * clear the command error, also clears queue to the device
		 * in error, and we can (re)issue commands to this device.
		 * When a device is in error all commands queued into the
		 * host controller and at the device are considered aborted
		 * and the queue for that device is stopped. Now, after
		 * clearing the device error, we can issue commands to the
		 * device to interrogate it to find the source of the error.
		 */
		dereg = ioread32(hcr_base + DE);
		iowrite32(dereg, hcr_base + DE);
		iowrite32(cereg, hcr_base + CE);

		DPRINTK("single device error, CE=0x%x, DE=0x%x\n",
			ioread32(hcr_base + CE), ioread32(hcr_base + DE));
		/*
		 * We should consider this as non fatal error, and TF must
		 * be updated as done below.
		 */

		err_mask |= AC_ERR_DEV;
	}

	/* handle fatal errors */
	if (hstatus & FATAL_ERROR_DECODE) {
		err_mask |= AC_ERR_ATA_BUS;
		action |= ATA_EH_RESET;
		/* how will fatal error interrupts be completed ?? */
		freeze = 1;
	}

	/* Handle PHYRDY change notification */
	if (hstatus & INT_ON_PHYRDY_CHG) {
		DPRINTK("SATA FSL: PHYRDY change indication\n");

		/* Setup a soft-reset EH action */
		ata_ehi_hotplugged(ehi);
		freeze = 1;
	}

	/* record error info */
	qc = ata_qc_from_tag(ap, link->active_tag);

	if (qc) {
		sata_fsl_cache_taskfile_from_d2h_fis(qc, qc->ap);
		qc->err_mask |= err_mask;
	} else
		ehi->err_mask |= err_mask;

	ehi->action |= action;
	ehi->serror |= SError;

	/* freeze or abort */
	if (freeze)
		ata_port_freeze(ap);
	else
		ata_port_abort(ap);
}

static void sata_fsl_qc_complete(struct ata_queued_cmd *qc)
{
	if (qc->flags & ATA_QCFLAG_RESULT_TF) {
		DPRINTK("xx_qc_complete called\n");
		sata_fsl_cache_taskfile_from_d2h_fis(qc, qc->ap);
	}
}

static void sata_fsl_host_intr(struct ata_port *ap)
{
	struct ata_link *link = &ap->link;
	struct sata_fsl_host_priv *host_priv = ap->host->private_data;
	void __iomem *hcr_base = host_priv->hcr_base;
	u32 hstatus, qc_active = 0;
	struct ata_queued_cmd *qc;
	u32 SError;

	hstatus = ioread32(hcr_base + HSTATUS);

	sata_fsl_scr_read(ap, SCR_ERROR, &SError);

	if (unlikely(SError & 0xFFFF0000)) {
		DPRINTK("serror @host_intr : 0x%x\n", SError);
		sata_fsl_error_intr(ap);

	}

	if (unlikely(hstatus & INT_ON_ERROR)) {
		DPRINTK("error interrupt!!\n");
		sata_fsl_error_intr(ap);
		return;
	}

	if (link->sactive) {	/* only true for NCQ commands */
		int i;
		/* Read command completed register */
		qc_active = ioread32(hcr_base + CC);
		/* clear CC bit, this will also complete the interrupt */
		iowrite32(qc_active, hcr_base + CC);

		DPRINTK("Status of all queues :\n");
		DPRINTK("qc_active/CC = 0x%x, CA = 0x%x, CE=0x%x\n",
			qc_active, ioread32(hcr_base + CA),
			ioread32(hcr_base + CE));

		for (i = 0; i < SATA_FSL_QUEUE_DEPTH; i++) {
			if (qc_active & (1 << i)) {
				qc = ata_qc_from_tag(ap, i);
				if (qc) {
					sata_fsl_qc_complete(qc);
					ata_qc_complete(qc);
				}
				DPRINTK
				    ("completing ncq cmd,tag=%d,CC=0x%x,CA=0x%x\n",
				     i, ioread32(hcr_base + CC),
				     ioread32(hcr_base + CA));
			}
		}
		return;

	} else if (ap->qc_active) {
		iowrite32(1, hcr_base + CC);
		qc = ata_qc_from_tag(ap, link->active_tag);

		DPRINTK("completing non-ncq cmd, tag=%d,CC=0x%x\n",
			link->active_tag, ioread32(hcr_base + CC));

		if (qc) {
			sata_fsl_qc_complete(qc);
			ata_qc_complete(qc);
		}
	} else {
		/* Spurious Interrupt!! */
		DPRINTK("spurious interrupt!!, CC = 0x%x\n",
			ioread32(hcr_base + CC));
		return;
	}
}

static irqreturn_t sata_fsl_interrupt(int irq, void *dev_instance)
{
	struct ata_host *host = dev_instance;
	struct sata_fsl_host_priv *host_priv = host->private_data;
	void __iomem *hcr_base = host_priv->hcr_base;
	u32 interrupt_enables;
	unsigned handled = 0;
	struct ata_port *ap;

	/* ack. any pending IRQs for this controller/port */
	interrupt_enables = ioread32(hcr_base + HSTATUS);
	interrupt_enables &= 0x3F;

	DPRINTK("interrupt status 0x%x\n", interrupt_enables);

	if (!interrupt_enables)
		return IRQ_NONE;

	spin_lock(&host->lock);

	/* Assuming one port per host controller */

	ap = host->ports[0];
	if (ap) {
		sata_fsl_host_intr(ap);
	} else {
		dev_printk(KERN_WARNING, host->dev,
			   "interrupt on disabled port 0\n");
	}

	iowrite32(interrupt_enables, hcr_base + HSTATUS);
	handled = 1;

	spin_unlock(&host->lock);

	return IRQ_RETVAL(handled);
}

/*
 * Multiple ports are represented by multiple SATA controllers with
 * one port per controller
 */
static int sata_fsl_init_controller(struct ata_host *host)
{
	struct sata_fsl_host_priv *host_priv = host->private_data;
	void __iomem *hcr_base = host_priv->hcr_base;
	u32 temp;

	/*
	 * NOTE : We cannot bring the controller online before setting
	 * the CHBA, hence main controller initialization is done as
	 * part of the port_start() callback
	 */

	/* ack. any pending IRQs for this controller/port */
	temp = ioread32(hcr_base + HSTATUS);
	if (temp & 0x3F)
		iowrite32((temp & 0x3F), hcr_base + HSTATUS);

	/* Keep interrupts disabled on the controller */
	temp = ioread32(hcr_base + HCONTROL);
	iowrite32((temp & ~0x3F), hcr_base + HCONTROL);

	/* Disable interrupt coalescing control(icc), for the moment */
	DPRINTK("icc = 0x%x\n", ioread32(hcr_base + ICC));
	iowrite32(0x01000000, hcr_base + ICC);

	/* clear error registers, SError is cleared by libATA  */
	iowrite32(0x00000FFFF, hcr_base + CE);
	iowrite32(0x00000FFFF, hcr_base + DE);

	/* initially assuming no Port multiplier, set CQPMP to 0 */
	iowrite32(0x0, hcr_base + CQPMP);

	/*
	 * host controller will be brought on-line, during xx_port_start()
	 * callback, that should also initiate the OOB, COMINIT sequence
	 */

	DPRINTK("HStatus = 0x%x\n", ioread32(hcr_base + HSTATUS));
	DPRINTK("HControl = 0x%x\n", ioread32(hcr_base + HCONTROL));

	return 0;
}

/*
 * scsi mid-layer and libata interface structures
 */
static struct scsi_host_template sata_fsl_sht = {
	.module = THIS_MODULE,
	.name = "sata_fsl",
	.ioctl = ata_scsi_ioctl,
	.queuecommand = ata_scsi_queuecmd,
	.change_queue_depth = ata_scsi_change_queue_depth,
	.can_queue = SATA_FSL_QUEUE_DEPTH,
	.this_id = ATA_SHT_THIS_ID,
	.sg_tablesize = SATA_FSL_MAX_PRD_USABLE,
	.cmd_per_lun = ATA_SHT_CMD_PER_LUN,
	.emulated = ATA_SHT_EMULATED,
	.use_clustering = ATA_SHT_USE_CLUSTERING,
	.proc_name = "sata_fsl",
	.dma_boundary = ATA_DMA_BOUNDARY,
	.slave_configure = ata_scsi_slave_config,
	.slave_destroy = ata_scsi_slave_destroy,
	.bios_param = ata_std_bios_param,
};

static const struct ata_port_operations sata_fsl_ops = {
	.check_status = sata_fsl_check_status,
	.check_altstatus = sata_fsl_check_status,
	.dev_select = ata_noop_dev_select,

	.tf_read = sata_fsl_tf_read,

	.qc_prep = sata_fsl_qc_prep,
	.qc_issue = sata_fsl_qc_issue,
	.irq_clear = sata_fsl_irq_clear,

	.scr_read = sata_fsl_scr_read,
	.scr_write = sata_fsl_scr_write,

	.freeze = sata_fsl_freeze,
	.thaw = sata_fsl_thaw,
	.error_handler = sata_fsl_error_handler,
	.post_internal_cmd = sata_fsl_post_internal_cmd,

	.port_start = sata_fsl_port_start,
	.port_stop = sata_fsl_port_stop,
};

static const struct ata_port_info sata_fsl_port_info[] = {
	{
	 .flags = SATA_FSL_HOST_FLAGS,
	 .link_flags = SATA_FSL_HOST_LFLAGS,
	 .pio_mask = 0x1f,	/* pio 0-4 */
	 .udma_mask = 0x7f,	/* udma 0-6 */
	 .port_ops = &sata_fsl_ops,
	 },
};

static int sata_fsl_probe(struct of_device *ofdev,
			const struct of_device_id *match)
{
	int retval = 0;
	void __iomem *hcr_base = NULL;
	void __iomem *ssr_base = NULL;
	void __iomem *csr_base = NULL;
	struct sata_fsl_host_priv *host_priv = NULL;
	int irq;
	struct ata_host *host;

	struct ata_port_info pi = sata_fsl_port_info[0];
	const struct ata_port_info *ppi[] = { &pi, NULL };

	dev_printk(KERN_INFO, &ofdev->dev,
		   "Sata FSL Platform/CSB Driver init\n");

	hcr_base = of_iomap(ofdev->node, 0);
	if (!hcr_base)
		goto error_exit_with_cleanup;

	ssr_base = hcr_base + 0x100;
	csr_base = hcr_base + 0x140;

	DPRINTK("@reset i/o = 0x%x\n", ioread32(csr_base + TRANSCFG));
	DPRINTK("sizeof(cmd_desc) = %d\n", sizeof(struct command_desc));
	DPRINTK("sizeof(#define cmd_desc) = %d\n", SATA_FSL_CMD_DESC_SIZE);

	host_priv = kzalloc(sizeof(struct sata_fsl_host_priv), GFP_KERNEL);
	if (!host_priv)
		goto error_exit_with_cleanup;

	host_priv->hcr_base = hcr_base;
	host_priv->ssr_base = ssr_base;
	host_priv->csr_base = csr_base;

	irq = irq_of_parse_and_map(ofdev->node, 0);
	if (irq < 0) {
		dev_printk(KERN_ERR, &ofdev->dev, "invalid irq from platform\n");
		goto error_exit_with_cleanup;
	}
	host_priv->irq = irq;

	/* allocate host structure */
	host = ata_host_alloc_pinfo(&ofdev->dev, ppi, SATA_FSL_MAX_PORTS);

	/* host->iomap is not used currently */
	host->private_data = host_priv;

	/* setup port(s) */

	host->ports[0]->ioaddr.cmd_addr = host_priv->hcr_base;
	host->ports[0]->ioaddr.scr_addr = host_priv->ssr_base;

	/* initialize host controller */
	sata_fsl_init_controller(host);

	/*
	 * Now, register with libATA core, this will also initiate the
	 * device discovery process, invoking our port_start() handler &
	 * error_handler() to execute a dummy Softreset EH session
	 */
	ata_host_activate(host, irq, sata_fsl_interrupt, SATA_FSL_IRQ_FLAG,
			  &sata_fsl_sht);

	dev_set_drvdata(&ofdev->dev, host);

	return 0;

error_exit_with_cleanup:

	if (hcr_base)
		iounmap(hcr_base);
	if (host_priv)
		kfree(host_priv);

	return retval;
}

static int sata_fsl_remove(struct of_device *ofdev)
{
	struct ata_host *host = dev_get_drvdata(&ofdev->dev);
	struct sata_fsl_host_priv *host_priv = host->private_data;

	ata_host_detach(host);

	dev_set_drvdata(&ofdev->dev, NULL);

	irq_dispose_mapping(host_priv->irq);
	iounmap(host_priv->hcr_base);
	kfree(host_priv);

	return 0;
}

static struct of_device_id fsl_sata_match[] = {
	{
		.compatible = "fsl,pq-sata",
	},
	{},
};

MODULE_DEVICE_TABLE(of, fsl_sata_match);

static struct of_platform_driver fsl_sata_driver = {
	.name		= "fsl-sata",
	.match_table	= fsl_sata_match,
	.probe		= sata_fsl_probe,
	.remove		= sata_fsl_remove,
};

static int __init sata_fsl_init(void)
{
	of_register_platform_driver(&fsl_sata_driver);
	return 0;
}

static void __exit sata_fsl_exit(void)
{
	of_unregister_platform_driver(&fsl_sata_driver);
}

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Ashish Kalra, Freescale Semiconductor");
MODULE_DESCRIPTION("Freescale 3.0Gbps SATA controller low level driver");
MODULE_VERSION("1.10");

module_init(sata_fsl_init);
module_exit(sata_fsl_exit);