summaryrefslogtreecommitdiffstats
path: root/drivers/spi/spi-zynqmp-gqspi.c
blob: 9f83e1b17aa16b6aa934d24955e5da7773af10a7 (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
/*
 * Xilinx Zynq UltraScale+ MPSoC Quad-SPI (QSPI) controller driver
 * (master mode only)
 *
 * Copyright (C) 2009 - 2015 Xilinx, Inc.
 *
 * 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; either version 2 of the License, or
 * (at your option) any later version.
 */

#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/dma-mapping.h>
#include <linux/dmaengine.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/of_irq.h>
#include <linux/of_address.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/spi/spi.h>
#include <linux/spinlock.h>
#include <linux/workqueue.h>

/* Generic QSPI register offsets */
#define GQSPI_CONFIG_OFST		0x00000100
#define GQSPI_ISR_OFST			0x00000104
#define GQSPI_IDR_OFST			0x0000010C
#define GQSPI_IER_OFST			0x00000108
#define GQSPI_IMASK_OFST		0x00000110
#define GQSPI_EN_OFST			0x00000114
#define GQSPI_TXD_OFST			0x0000011C
#define GQSPI_RXD_OFST			0x00000120
#define GQSPI_TX_THRESHOLD_OFST		0x00000128
#define GQSPI_RX_THRESHOLD_OFST		0x0000012C
#define GQSPI_LPBK_DLY_ADJ_OFST		0x00000138
#define GQSPI_GEN_FIFO_OFST		0x00000140
#define GQSPI_SEL_OFST			0x00000144
#define GQSPI_GF_THRESHOLD_OFST		0x00000150
#define GQSPI_FIFO_CTRL_OFST		0x0000014C
#define GQSPI_QSPIDMA_DST_CTRL_OFST	0x0000080C
#define GQSPI_QSPIDMA_DST_SIZE_OFST	0x00000804
#define GQSPI_QSPIDMA_DST_STS_OFST	0x00000808
#define GQSPI_QSPIDMA_DST_I_STS_OFST	0x00000814
#define GQSPI_QSPIDMA_DST_I_EN_OFST	0x00000818
#define GQSPI_QSPIDMA_DST_I_DIS_OFST	0x0000081C
#define GQSPI_QSPIDMA_DST_I_MASK_OFST	0x00000820
#define GQSPI_QSPIDMA_DST_ADDR_OFST	0x00000800
#define GQSPI_QSPIDMA_DST_ADDR_MSB_OFST 0x00000828

/* GQSPI register bit masks */
#define GQSPI_SEL_MASK				0x00000001
#define GQSPI_EN_MASK				0x00000001
#define GQSPI_LPBK_DLY_ADJ_USE_LPBK_MASK	0x00000020
#define GQSPI_ISR_WR_TO_CLR_MASK		0x00000002
#define GQSPI_IDR_ALL_MASK			0x00000FBE
#define GQSPI_CFG_MODE_EN_MASK			0xC0000000
#define GQSPI_CFG_GEN_FIFO_START_MODE_MASK	0x20000000
#define GQSPI_CFG_ENDIAN_MASK			0x04000000
#define GQSPI_CFG_EN_POLL_TO_MASK		0x00100000
#define GQSPI_CFG_WP_HOLD_MASK			0x00080000
#define GQSPI_CFG_BAUD_RATE_DIV_MASK		0x00000038
#define GQSPI_CFG_CLK_PHA_MASK			0x00000004
#define GQSPI_CFG_CLK_POL_MASK			0x00000002
#define GQSPI_CFG_START_GEN_FIFO_MASK		0x10000000
#define GQSPI_GENFIFO_IMM_DATA_MASK		0x000000FF
#define GQSPI_GENFIFO_DATA_XFER			0x00000100
#define GQSPI_GENFIFO_EXP			0x00000200
#define GQSPI_GENFIFO_MODE_SPI			0x00000400
#define GQSPI_GENFIFO_MODE_DUALSPI		0x00000800
#define GQSPI_GENFIFO_MODE_QUADSPI		0x00000C00
#define GQSPI_GENFIFO_MODE_MASK			0x00000C00
#define GQSPI_GENFIFO_CS_LOWER			0x00001000
#define GQSPI_GENFIFO_CS_UPPER			0x00002000
#define GQSPI_GENFIFO_BUS_LOWER			0x00004000
#define GQSPI_GENFIFO_BUS_UPPER			0x00008000
#define GQSPI_GENFIFO_BUS_BOTH			0x0000C000
#define GQSPI_GENFIFO_BUS_MASK			0x0000C000
#define GQSPI_GENFIFO_TX			0x00010000
#define GQSPI_GENFIFO_RX			0x00020000
#define GQSPI_GENFIFO_STRIPE			0x00040000
#define GQSPI_GENFIFO_POLL			0x00080000
#define GQSPI_GENFIFO_EXP_START			0x00000100
#define GQSPI_FIFO_CTRL_RST_RX_FIFO_MASK	0x00000004
#define GQSPI_FIFO_CTRL_RST_TX_FIFO_MASK	0x00000002
#define GQSPI_FIFO_CTRL_RST_GEN_FIFO_MASK	0x00000001
#define GQSPI_ISR_RXEMPTY_MASK			0x00000800
#define GQSPI_ISR_GENFIFOFULL_MASK		0x00000400
#define GQSPI_ISR_GENFIFONOT_FULL_MASK		0x00000200
#define GQSPI_ISR_TXEMPTY_MASK			0x00000100
#define GQSPI_ISR_GENFIFOEMPTY_MASK		0x00000080
#define GQSPI_ISR_RXFULL_MASK			0x00000020
#define GQSPI_ISR_RXNEMPTY_MASK			0x00000010
#define GQSPI_ISR_TXFULL_MASK			0x00000008
#define GQSPI_ISR_TXNOT_FULL_MASK		0x00000004
#define GQSPI_ISR_POLL_TIME_EXPIRE_MASK		0x00000002
#define GQSPI_IER_TXNOT_FULL_MASK		0x00000004
#define GQSPI_IER_RXEMPTY_MASK			0x00000800
#define GQSPI_IER_POLL_TIME_EXPIRE_MASK		0x00000002
#define GQSPI_IER_RXNEMPTY_MASK			0x00000010
#define GQSPI_IER_GENFIFOEMPTY_MASK		0x00000080
#define GQSPI_IER_TXEMPTY_MASK			0x00000100
#define GQSPI_QSPIDMA_DST_INTR_ALL_MASK		0x000000FE
#define GQSPI_QSPIDMA_DST_STS_WTC		0x0000E000
#define GQSPI_CFG_MODE_EN_DMA_MASK		0x80000000
#define GQSPI_ISR_IDR_MASK			0x00000994
#define GQSPI_QSPIDMA_DST_I_EN_DONE_MASK	0x00000002
#define GQSPI_QSPIDMA_DST_I_STS_DONE_MASK	0x00000002
#define GQSPI_IRQ_MASK				0x00000980

#define GQSPI_CFG_BAUD_RATE_DIV_SHIFT		3
#define GQSPI_GENFIFO_CS_SETUP			0x4
#define GQSPI_GENFIFO_CS_HOLD			0x3
#define GQSPI_TXD_DEPTH				64
#define GQSPI_RX_FIFO_THRESHOLD			32
#define GQSPI_RX_FIFO_FILL	(GQSPI_RX_FIFO_THRESHOLD * 4)
#define GQSPI_TX_FIFO_THRESHOLD_RESET_VAL	32
#define GQSPI_TX_FIFO_FILL	(GQSPI_TXD_DEPTH -\
				GQSPI_TX_FIFO_THRESHOLD_RESET_VAL)
#define GQSPI_GEN_FIFO_THRESHOLD_RESET_VAL	0X10
#define GQSPI_QSPIDMA_DST_CTRL_RESET_VAL	0x803FFA00
#define GQSPI_SELECT_FLASH_CS_LOWER		0x1
#define GQSPI_SELECT_FLASH_CS_UPPER		0x2
#define GQSPI_SELECT_FLASH_CS_BOTH		0x3
#define GQSPI_SELECT_FLASH_BUS_LOWER		0x1
#define GQSPI_SELECT_FLASH_BUS_UPPER		0x2
#define GQSPI_SELECT_FLASH_BUS_BOTH		0x3
#define GQSPI_BAUD_DIV_MAX	7	/* Baud rate divisor maximum */
#define GQSPI_BAUD_DIV_SHIFT	2	/* Baud rate divisor shift */
#define GQSPI_SELECT_MODE_SPI		0x1
#define GQSPI_SELECT_MODE_DUALSPI	0x2
#define GQSPI_SELECT_MODE_QUADSPI	0x4
#define GQSPI_DMA_UNALIGN		0x3
#define GQSPI_DEFAULT_NUM_CS	1	/* Default number of chip selects */

#define SPI_AUTOSUSPEND_TIMEOUT		3000
enum mode_type {GQSPI_MODE_IO, GQSPI_MODE_DMA};

/**
 * struct zynqmp_qspi - Defines qspi driver instance
 * @regs:		Virtual address of the QSPI controller registers
 * @refclk:		Pointer to the peripheral clock
 * @pclk:		Pointer to the APB clock
 * @irq:		IRQ number
 * @dev:		Pointer to struct device
 * @txbuf:		Pointer to the TX buffer
 * @rxbuf:		Pointer to the RX buffer
 * @bytes_to_transfer:	Number of bytes left to transfer
 * @bytes_to_receive:	Number of bytes left to receive
 * @genfifocs:		Used for chip select
 * @genfifobus:		Used to select the upper or lower bus
 * @dma_rx_bytes:	Remaining bytes to receive by DMA mode
 * @dma_addr:		DMA address after mapping the kernel buffer
 * @genfifoentry:	Used for storing the genfifoentry instruction.
 * @mode:		Defines the mode in which QSPI is operating
 */
struct zynqmp_qspi {
	void __iomem *regs;
	struct clk *refclk;
	struct clk *pclk;
	int irq;
	struct device *dev;
	const void *txbuf;
	void *rxbuf;
	int bytes_to_transfer;
	int bytes_to_receive;
	u32 genfifocs;
	u32 genfifobus;
	u32 dma_rx_bytes;
	dma_addr_t dma_addr;
	u32 genfifoentry;
	enum mode_type mode;
};

/**
 * zynqmp_gqspi_read:	For GQSPI controller read operation
 * @xqspi:	Pointer to the zynqmp_qspi structure
 * @offset:	Offset from where to read
 */
static u32 zynqmp_gqspi_read(struct zynqmp_qspi *xqspi, u32 offset)
{
	return readl_relaxed(xqspi->regs + offset);
}

/**
 * zynqmp_gqspi_write:	For GQSPI controller write operation
 * @xqspi:	Pointer to the zynqmp_qspi structure
 * @offset:	Offset where to write
 * @val:	Value to be written
 */
static inline void zynqmp_gqspi_write(struct zynqmp_qspi *xqspi, u32 offset,
				      u32 val)
{
	writel_relaxed(val, (xqspi->regs + offset));
}

/**
 * zynqmp_gqspi_selectslave:	For selection of slave device
 * @instanceptr:	Pointer to the zynqmp_qspi structure
 * @flashcs:	For chip select
 * @flashbus:	To check which bus is selected- upper or lower
 */
static void zynqmp_gqspi_selectslave(struct zynqmp_qspi *instanceptr,
				     u8 slavecs, u8 slavebus)
{
	/*
	 * Bus and CS lines selected here will be updated in the instance and
	 * used for subsequent GENFIFO entries during transfer.
	 */

	/* Choose slave select line */
	switch (slavecs) {
	case GQSPI_SELECT_FLASH_CS_BOTH:
		instanceptr->genfifocs = GQSPI_GENFIFO_CS_LOWER |
			GQSPI_GENFIFO_CS_UPPER;
		break;
	case GQSPI_SELECT_FLASH_CS_UPPER:
		instanceptr->genfifocs = GQSPI_GENFIFO_CS_UPPER;
		break;
	case GQSPI_SELECT_FLASH_CS_LOWER:
		instanceptr->genfifocs = GQSPI_GENFIFO_CS_LOWER;
		break;
	default:
		dev_warn(instanceptr->dev, "Invalid slave select\n");
	}

	/* Choose the bus */
	switch (slavebus) {
	case GQSPI_SELECT_FLASH_BUS_BOTH:
		instanceptr->genfifobus = GQSPI_GENFIFO_BUS_LOWER |
			GQSPI_GENFIFO_BUS_UPPER;
		break;
	case GQSPI_SELECT_FLASH_BUS_UPPER:
		instanceptr->genfifobus = GQSPI_GENFIFO_BUS_UPPER;
		break;
	case GQSPI_SELECT_FLASH_BUS_LOWER:
		instanceptr->genfifobus = GQSPI_GENFIFO_BUS_LOWER;
		break;
	default:
		dev_warn(instanceptr->dev, "Invalid slave bus\n");
	}
}

/**
 * zynqmp_qspi_init_hw:	Initialize the hardware
 * @xqspi:	Pointer to the zynqmp_qspi structure
 *
 * The default settings of the QSPI controller's configurable parameters on
 * reset are
 *	- Master mode
 *	- TX threshold set to 1
 *	- RX threshold set to 1
 *	- Flash memory interface mode enabled
 * This function performs the following actions
 *	- Disable and clear all the interrupts
 *	- Enable manual slave select
 *	- Enable manual start
 *	- Deselect all the chip select lines
 *	- Set the little endian mode of TX FIFO and
 *	- Enable the QSPI controller
 */
static void zynqmp_qspi_init_hw(struct zynqmp_qspi *xqspi)
{
	u32 config_reg;

	/* Select the GQSPI mode */
	zynqmp_gqspi_write(xqspi, GQSPI_SEL_OFST, GQSPI_SEL_MASK);
	/* Clear and disable interrupts */
	zynqmp_gqspi_write(xqspi, GQSPI_ISR_OFST,
			   zynqmp_gqspi_read(xqspi, GQSPI_ISR_OFST) |
			   GQSPI_ISR_WR_TO_CLR_MASK);
	/* Clear the DMA STS */
	zynqmp_gqspi_write(xqspi, GQSPI_QSPIDMA_DST_I_STS_OFST,
			   zynqmp_gqspi_read(xqspi,
					     GQSPI_QSPIDMA_DST_I_STS_OFST));
	zynqmp_gqspi_write(xqspi, GQSPI_QSPIDMA_DST_STS_OFST,
			   zynqmp_gqspi_read(xqspi,
					     GQSPI_QSPIDMA_DST_STS_OFST) |
					     GQSPI_QSPIDMA_DST_STS_WTC);
	zynqmp_gqspi_write(xqspi, GQSPI_IDR_OFST, GQSPI_IDR_ALL_MASK);
	zynqmp_gqspi_write(xqspi,
			   GQSPI_QSPIDMA_DST_I_DIS_OFST,
			   GQSPI_QSPIDMA_DST_INTR_ALL_MASK);
	/* Disable the GQSPI */
	zynqmp_gqspi_write(xqspi, GQSPI_EN_OFST, 0x0);
	config_reg = zynqmp_gqspi_read(xqspi, GQSPI_CONFIG_OFST);
	config_reg &= ~GQSPI_CFG_MODE_EN_MASK;
	/* Manual start */
	config_reg |= GQSPI_CFG_GEN_FIFO_START_MODE_MASK;
	/* Little endian by default */
	config_reg &= ~GQSPI_CFG_ENDIAN_MASK;
	/* Disable poll time out */
	config_reg &= ~GQSPI_CFG_EN_POLL_TO_MASK;
	/* Set hold bit */
	config_reg |= GQSPI_CFG_WP_HOLD_MASK;
	/* Clear pre-scalar by default */
	config_reg &= ~GQSPI_CFG_BAUD_RATE_DIV_MASK;
	/* CPHA 0 */
	config_reg &= ~GQSPI_CFG_CLK_PHA_MASK;
	/* CPOL 0 */
	config_reg &= ~GQSPI_CFG_CLK_POL_MASK;
	zynqmp_gqspi_write(xqspi, GQSPI_CONFIG_OFST, config_reg);

	/* Clear the TX and RX FIFO */
	zynqmp_gqspi_write(xqspi, GQSPI_FIFO_CTRL_OFST,
			   GQSPI_FIFO_CTRL_RST_RX_FIFO_MASK |
			   GQSPI_FIFO_CTRL_RST_TX_FIFO_MASK |
			   GQSPI_FIFO_CTRL_RST_GEN_FIFO_MASK);
	/* Set by default to allow for high frequencies */
	zynqmp_gqspi_write(xqspi, GQSPI_LPBK_DLY_ADJ_OFST,
			   zynqmp_gqspi_read(xqspi, GQSPI_LPBK_DLY_ADJ_OFST) |
			   GQSPI_LPBK_DLY_ADJ_USE_LPBK_MASK);
	/* Reset thresholds */
	zynqmp_gqspi_write(xqspi, GQSPI_TX_THRESHOLD_OFST,
			   GQSPI_TX_FIFO_THRESHOLD_RESET_VAL);
	zynqmp_gqspi_write(xqspi, GQSPI_RX_THRESHOLD_OFST,
			   GQSPI_RX_FIFO_THRESHOLD);
	zynqmp_gqspi_write(xqspi, GQSPI_GF_THRESHOLD_OFST,
			   GQSPI_GEN_FIFO_THRESHOLD_RESET_VAL);
	zynqmp_gqspi_selectslave(xqspi,
				 GQSPI_SELECT_FLASH_CS_LOWER,
				 GQSPI_SELECT_FLASH_BUS_LOWER);
	/* Initialize DMA */
	zynqmp_gqspi_write(xqspi,
			GQSPI_QSPIDMA_DST_CTRL_OFST,
			GQSPI_QSPIDMA_DST_CTRL_RESET_VAL);

	/* Enable the GQSPI */
	zynqmp_gqspi_write(xqspi, GQSPI_EN_OFST, GQSPI_EN_MASK);
}

/**
 * zynqmp_qspi_copy_read_data:	Copy data to RX buffer
 * @xqspi:	Pointer to the zynqmp_qspi structure
 * @data:	The variable where data is stored
 * @size:	Number of bytes to be copied from data to RX buffer
 */
static void zynqmp_qspi_copy_read_data(struct zynqmp_qspi *xqspi,
				       ulong data, u8 size)
{
	memcpy(xqspi->rxbuf, &data, size);
	xqspi->rxbuf += size;
	xqspi->bytes_to_receive -= size;
}

/**
 * zynqmp_prepare_transfer_hardware:	Prepares hardware for transfer.
 * @master:	Pointer to the spi_master structure which provides
 *		information about the controller.
 *
 * This function enables SPI master controller.
 *
 * Return:	0 on success; error value otherwise
 */
static int zynqmp_prepare_transfer_hardware(struct spi_master *master)
{
	struct zynqmp_qspi *xqspi = spi_master_get_devdata(master);

	zynqmp_gqspi_write(xqspi, GQSPI_EN_OFST, GQSPI_EN_MASK);
	return 0;
}

/**
 * zynqmp_unprepare_transfer_hardware:	Relaxes hardware after transfer
 * @master:	Pointer to the spi_master structure which provides
 *		information about the controller.
 *
 * This function disables the SPI master controller.
 *
 * Return:	Always 0
 */
static int zynqmp_unprepare_transfer_hardware(struct spi_master *master)
{
	struct zynqmp_qspi *xqspi = spi_master_get_devdata(master);

	zynqmp_gqspi_write(xqspi, GQSPI_EN_OFST, 0x0);
	return 0;
}

/**
 * zynqmp_qspi_chipselect:	Select or deselect the chip select line
 * @qspi:	Pointer to the spi_device structure
 * @is_high:	Select(0) or deselect (1) the chip select line
 */
static void zynqmp_qspi_chipselect(struct spi_device *qspi, bool is_high)
{
	struct zynqmp_qspi *xqspi = spi_master_get_devdata(qspi->master);
	ulong timeout;
	u32 genfifoentry = 0x0, statusreg;

	genfifoentry |= GQSPI_GENFIFO_MODE_SPI;
	genfifoentry |= xqspi->genfifobus;

	if (!is_high) {
		genfifoentry |= xqspi->genfifocs;
		genfifoentry |= GQSPI_GENFIFO_CS_SETUP;
	} else {
		genfifoentry |= GQSPI_GENFIFO_CS_HOLD;
	}

	zynqmp_gqspi_write(xqspi, GQSPI_GEN_FIFO_OFST, genfifoentry);

	/* Dummy generic FIFO entry */
	zynqmp_gqspi_write(xqspi, GQSPI_GEN_FIFO_OFST, 0x0);

	/* Manually start the generic FIFO command */
	zynqmp_gqspi_write(xqspi, GQSPI_CONFIG_OFST,
			zynqmp_gqspi_read(xqspi, GQSPI_CONFIG_OFST) |
			GQSPI_CFG_START_GEN_FIFO_MASK);

	timeout = jiffies + msecs_to_jiffies(1000);

	/* Wait until the generic FIFO command is empty */
	do {
		statusreg = zynqmp_gqspi_read(xqspi, GQSPI_ISR_OFST);

		if ((statusreg & GQSPI_ISR_GENFIFOEMPTY_MASK) &&
			(statusreg & GQSPI_ISR_TXEMPTY_MASK))
			break;
		else
			cpu_relax();
	} while (!time_after_eq(jiffies, timeout));

	if (time_after_eq(jiffies, timeout))
		dev_err(xqspi->dev, "Chip select timed out\n");
}

/**
 * zynqmp_qspi_setup_transfer:	Configure QSPI controller for specified
 *				transfer
 * @qspi:	Pointer to the spi_device structure
 * @transfer:	Pointer to the spi_transfer structure which provides
 *		information about next transfer setup parameters
 *
 * Sets the operational mode of QSPI controller for the next QSPI transfer and
 * sets the requested clock frequency.
 *
 * Return:	Always 0
 *
 * Note:
 *	If the requested frequency is not an exact match with what can be
 *	obtained using the pre-scalar value, the driver sets the clock
 *	frequency which is lower than the requested frequency (maximum lower)
 *	for the transfer.
 *
 *	If the requested frequency is higher or lower than that is supported
 *	by the QSPI controller the driver will set the highest or lowest
 *	frequency supported by controller.
 */
static int zynqmp_qspi_setup_transfer(struct spi_device *qspi,
				      struct spi_transfer *transfer)
{
	struct zynqmp_qspi *xqspi = spi_master_get_devdata(qspi->master);
	ulong clk_rate;
	u32 config_reg, req_hz, baud_rate_val = 0;

	if (transfer)
		req_hz = transfer->speed_hz;
	else
		req_hz = qspi->max_speed_hz;

	/* Set the clock frequency */
	/* If req_hz == 0, default to lowest speed */
	clk_rate = clk_get_rate(xqspi->refclk);

	while ((baud_rate_val < GQSPI_BAUD_DIV_MAX) &&
	       (clk_rate /
		(GQSPI_BAUD_DIV_SHIFT << baud_rate_val)) > req_hz)
		baud_rate_val++;

	config_reg = zynqmp_gqspi_read(xqspi, GQSPI_CONFIG_OFST);

	/* Set the QSPI clock phase and clock polarity */
	config_reg &= (~GQSPI_CFG_CLK_PHA_MASK) & (~GQSPI_CFG_CLK_POL_MASK);

	if (qspi->mode & SPI_CPHA)
		config_reg |= GQSPI_CFG_CLK_PHA_MASK;
	if (qspi->mode & SPI_CPOL)
		config_reg |= GQSPI_CFG_CLK_POL_MASK;

	config_reg &= ~GQSPI_CFG_BAUD_RATE_DIV_MASK;
	config_reg |= (baud_rate_val << GQSPI_CFG_BAUD_RATE_DIV_SHIFT);
	zynqmp_gqspi_write(xqspi, GQSPI_CONFIG_OFST, config_reg);
	return 0;
}

/**
 * zynqmp_qspi_setup:	Configure the QSPI controller
 * @qspi:	Pointer to the spi_device structure
 *
 * Sets the operational mode of QSPI controller for the next QSPI transfer,
 * baud rate and divisor value to setup the requested qspi clock.
 *
 * Return:	0 on success; error value otherwise.
 */
static int zynqmp_qspi_setup(struct spi_device *qspi)
{
	if (qspi->master->busy)
		return -EBUSY;
	return 0;
}

/**
 * zynqmp_qspi_filltxfifo:	Fills the TX FIFO as long as there is room in
 *				the FIFO or the bytes required to be
 *				transmitted.
 * @xqspi:	Pointer to the zynqmp_qspi structure
 * @size:	Number of bytes to be copied from TX buffer to TX FIFO
 */
static void zynqmp_qspi_filltxfifo(struct zynqmp_qspi *xqspi, int size)
{
	u32 count = 0, intermediate;

	while ((xqspi->bytes_to_transfer > 0) && (count < size)) {
		memcpy(&intermediate, xqspi->txbuf, 4);
		zynqmp_gqspi_write(xqspi, GQSPI_TXD_OFST, intermediate);

		if (xqspi->bytes_to_transfer >= 4) {
			xqspi->txbuf += 4;
			xqspi->bytes_to_transfer -= 4;
		} else {
			xqspi->txbuf += xqspi->bytes_to_transfer;
			xqspi->bytes_to_transfer = 0;
		}
		count++;
	}
}

/**
 * zynqmp_qspi_readrxfifo:	Fills the RX FIFO as long as there is room in
 *				the FIFO.
 * @xqspi:	Pointer to the zynqmp_qspi structure
 * @size:	Number of bytes to be copied from RX buffer to RX FIFO
 */
static void zynqmp_qspi_readrxfifo(struct zynqmp_qspi *xqspi, u32 size)
{
	ulong data;
	int count = 0;

	while ((count < size) && (xqspi->bytes_to_receive > 0)) {
		if (xqspi->bytes_to_receive >= 4) {
			(*(u32 *) xqspi->rxbuf) =
			zynqmp_gqspi_read(xqspi, GQSPI_RXD_OFST);
			xqspi->rxbuf += 4;
			xqspi->bytes_to_receive -= 4;
			count += 4;
		} else {
			data = zynqmp_gqspi_read(xqspi, GQSPI_RXD_OFST);
			count += xqspi->bytes_to_receive;
			zynqmp_qspi_copy_read_data(xqspi, data,
						   xqspi->bytes_to_receive);
			xqspi->bytes_to_receive = 0;
		}
	}
}

/**
 * zynqmp_process_dma_irq:	Handler for DMA done interrupt of QSPI
 *				controller
 * @xqspi:	zynqmp_qspi instance pointer
 *
 * This function handles DMA interrupt only.
 */
static void zynqmp_process_dma_irq(struct zynqmp_qspi *xqspi)
{
	u32 config_reg, genfifoentry;

	dma_unmap_single(xqspi->dev, xqspi->dma_addr,
				xqspi->dma_rx_bytes, DMA_FROM_DEVICE);
	xqspi->rxbuf += xqspi->dma_rx_bytes;
	xqspi->bytes_to_receive -= xqspi->dma_rx_bytes;
	xqspi->dma_rx_bytes = 0;

	/* Disabling the DMA interrupts */
	zynqmp_gqspi_write(xqspi, GQSPI_QSPIDMA_DST_I_DIS_OFST,
					GQSPI_QSPIDMA_DST_I_EN_DONE_MASK);

	if (xqspi->bytes_to_receive > 0) {
		/* Switch to IO mode,for remaining bytes to receive */
		config_reg = zynqmp_gqspi_read(xqspi, GQSPI_CONFIG_OFST);
		config_reg &= ~GQSPI_CFG_MODE_EN_MASK;
		zynqmp_gqspi_write(xqspi, GQSPI_CONFIG_OFST, config_reg);

		/* Initiate the transfer of remaining bytes */
		genfifoentry = xqspi->genfifoentry;
		genfifoentry |= xqspi->bytes_to_receive;
		zynqmp_gqspi_write(xqspi, GQSPI_GEN_FIFO_OFST, genfifoentry);

		/* Dummy generic FIFO entry */
		zynqmp_gqspi_write(xqspi, GQSPI_GEN_FIFO_OFST, 0x0);

		/* Manual start */
		zynqmp_gqspi_write(xqspi, GQSPI_CONFIG_OFST,
			(zynqmp_gqspi_read(xqspi, GQSPI_CONFIG_OFST) |
			GQSPI_CFG_START_GEN_FIFO_MASK));

		/* Enable the RX interrupts for IO mode */
		zynqmp_gqspi_write(xqspi, GQSPI_IER_OFST,
				GQSPI_IER_GENFIFOEMPTY_MASK |
				GQSPI_IER_RXNEMPTY_MASK |
				GQSPI_IER_RXEMPTY_MASK);
	}
}

/**
 * zynqmp_qspi_irq:	Interrupt service routine of the QSPI controller
 * @irq:	IRQ number
 * @dev_id:	Pointer to the xqspi structure
 *
 * This function handles TX empty only.
 * On TX empty interrupt this function reads the received data from RX FIFO
 * and fills the TX FIFO if there is any data remaining to be transferred.
 *
 * Return:	IRQ_HANDLED when interrupt is handled
 *		IRQ_NONE otherwise.
 */
static irqreturn_t zynqmp_qspi_irq(int irq, void *dev_id)
{
	struct spi_master *master = dev_id;
	struct zynqmp_qspi *xqspi = spi_master_get_devdata(master);
	int ret = IRQ_NONE;
	u32 status, mask, dma_status = 0;

	status = zynqmp_gqspi_read(xqspi, GQSPI_ISR_OFST);
	zynqmp_gqspi_write(xqspi, GQSPI_ISR_OFST, status);
	mask = (status & ~(zynqmp_gqspi_read(xqspi, GQSPI_IMASK_OFST)));

	/* Read and clear DMA status */
	if (xqspi->mode == GQSPI_MODE_DMA) {
		dma_status =
			zynqmp_gqspi_read(xqspi, GQSPI_QSPIDMA_DST_I_STS_OFST);
		zynqmp_gqspi_write(xqspi, GQSPI_QSPIDMA_DST_I_STS_OFST,
								dma_status);
	}

	if (mask & GQSPI_ISR_TXNOT_FULL_MASK) {
		zynqmp_qspi_filltxfifo(xqspi, GQSPI_TX_FIFO_FILL);
		ret = IRQ_HANDLED;
	}

	if (dma_status & GQSPI_QSPIDMA_DST_I_STS_DONE_MASK) {
		zynqmp_process_dma_irq(xqspi);
		ret = IRQ_HANDLED;
	} else if (!(mask & GQSPI_IER_RXEMPTY_MASK) &&
			(mask & GQSPI_IER_GENFIFOEMPTY_MASK)) {
		zynqmp_qspi_readrxfifo(xqspi, GQSPI_RX_FIFO_FILL);
		ret = IRQ_HANDLED;
	}

	if ((xqspi->bytes_to_receive == 0) && (xqspi->bytes_to_transfer == 0)
			&& ((status & GQSPI_IRQ_MASK) == GQSPI_IRQ_MASK)) {
		zynqmp_gqspi_write(xqspi, GQSPI_IDR_OFST, GQSPI_ISR_IDR_MASK);
		spi_finalize_current_transfer(master);
		ret = IRQ_HANDLED;
	}
	return ret;
}

/**
 * zynqmp_qspi_selectspimode:	Selects SPI mode - x1 or x2 or x4.
 * @xqspi:	xqspi is a pointer to the GQSPI instance
 * @spimode:	spimode - SPI or DUAL or QUAD.
 * Return:	Mask to set desired SPI mode in GENFIFO entry.
 */
static inline u32 zynqmp_qspi_selectspimode(struct zynqmp_qspi *xqspi,
						u8 spimode)
{
	u32 mask = 0;

	switch (spimode) {
	case GQSPI_SELECT_MODE_DUALSPI:
		mask = GQSPI_GENFIFO_MODE_DUALSPI;
		break;
	case GQSPI_SELECT_MODE_QUADSPI:
		mask = GQSPI_GENFIFO_MODE_QUADSPI;
		break;
	case GQSPI_SELECT_MODE_SPI:
		mask = GQSPI_GENFIFO_MODE_SPI;
		break;
	default:
		dev_warn(xqspi->dev, "Invalid SPI mode\n");
	}

	return mask;
}

/**
 * zynq_qspi_setuprxdma:	This function sets up the RX DMA operation
 * @xqspi:	xqspi is a pointer to the GQSPI instance.
 */
static void zynq_qspi_setuprxdma(struct zynqmp_qspi *xqspi)
{
	u32 rx_bytes, rx_rem, config_reg;
	dma_addr_t addr;
	u64 dma_align =  (u64)(uintptr_t)xqspi->rxbuf;

	if ((xqspi->bytes_to_receive < 8) ||
		((dma_align & GQSPI_DMA_UNALIGN) != 0x0)) {
		/* Setting to IO mode */
		config_reg = zynqmp_gqspi_read(xqspi, GQSPI_CONFIG_OFST);
		config_reg &= ~GQSPI_CFG_MODE_EN_MASK;
		zynqmp_gqspi_write(xqspi, GQSPI_CONFIG_OFST, config_reg);
		xqspi->mode = GQSPI_MODE_IO;
		xqspi->dma_rx_bytes = 0;
		return;
	}

	rx_rem = xqspi->bytes_to_receive % 4;
	rx_bytes = (xqspi->bytes_to_receive - rx_rem);

	addr = dma_map_single(xqspi->dev, (void *)xqspi->rxbuf,
						rx_bytes, DMA_FROM_DEVICE);
	if (dma_mapping_error(xqspi->dev, addr))
		dev_err(xqspi->dev, "ERR:rxdma:memory not mapped\n");

	xqspi->dma_rx_bytes = rx_bytes;
	xqspi->dma_addr = addr;
	zynqmp_gqspi_write(xqspi, GQSPI_QSPIDMA_DST_ADDR_OFST,
				(u32)(addr & 0xffffffff));
	addr = ((addr >> 16) >> 16);
	zynqmp_gqspi_write(xqspi, GQSPI_QSPIDMA_DST_ADDR_MSB_OFST,
				((u32)addr) & 0xfff);

	/* Enabling the DMA mode */
	config_reg = zynqmp_gqspi_read(xqspi, GQSPI_CONFIG_OFST);
	config_reg &= ~GQSPI_CFG_MODE_EN_MASK;
	config_reg |= GQSPI_CFG_MODE_EN_DMA_MASK;
	zynqmp_gqspi_write(xqspi, GQSPI_CONFIG_OFST, config_reg);

	/* Switch to DMA mode */
	xqspi->mode = GQSPI_MODE_DMA;

	/* Write the number of bytes to transfer */
	zynqmp_gqspi_write(xqspi, GQSPI_QSPIDMA_DST_SIZE_OFST, rx_bytes);
}

/**
 * zynqmp_qspi_txrxsetup:	This function checks the TX/RX buffers in
 *				the transfer and sets up the GENFIFO entries,
 *				TX FIFO as required.
 * @xqspi:	xqspi is a pointer to the GQSPI instance.
 * @transfer:	It is a pointer to the structure containing transfer data.
 * @genfifoentry:	genfifoentry is pointer to the variable in which
 *			GENFIFO	mask is returned to calling function
 */
static void zynqmp_qspi_txrxsetup(struct zynqmp_qspi *xqspi,
				  struct spi_transfer *transfer,
				  u32 *genfifoentry)
{
	u32 config_reg;

	/* Transmit */
	if ((xqspi->txbuf != NULL) && (xqspi->rxbuf == NULL)) {
		/* Setup data to be TXed */
		*genfifoentry &= ~GQSPI_GENFIFO_RX;
		*genfifoentry |= GQSPI_GENFIFO_DATA_XFER;
		*genfifoentry |= GQSPI_GENFIFO_TX;
		*genfifoentry |=
			zynqmp_qspi_selectspimode(xqspi, transfer->tx_nbits);
		xqspi->bytes_to_transfer = transfer->len;
		if (xqspi->mode == GQSPI_MODE_DMA) {
			config_reg = zynqmp_gqspi_read(xqspi,
							GQSPI_CONFIG_OFST);
			config_reg &= ~GQSPI_CFG_MODE_EN_MASK;
			zynqmp_gqspi_write(xqspi, GQSPI_CONFIG_OFST,
								config_reg);
			xqspi->mode = GQSPI_MODE_IO;
		}
		zynqmp_qspi_filltxfifo(xqspi, GQSPI_TXD_DEPTH);
		/* Discard RX data */
		xqspi->bytes_to_receive = 0;
	} else if ((xqspi->txbuf == NULL) && (xqspi->rxbuf != NULL)) {
		/* Receive */

		/* TX auto fill */
		*genfifoentry &= ~GQSPI_GENFIFO_TX;
		/* Setup RX */
		*genfifoentry |= GQSPI_GENFIFO_DATA_XFER;
		*genfifoentry |= GQSPI_GENFIFO_RX;
		*genfifoentry |=
			zynqmp_qspi_selectspimode(xqspi, transfer->rx_nbits);
		xqspi->bytes_to_transfer = 0;
		xqspi->bytes_to_receive = transfer->len;
		zynq_qspi_setuprxdma(xqspi);
	}
}

/**
 * zynqmp_qspi_start_transfer:	Initiates the QSPI transfer
 * @master:	Pointer to the spi_master structure which provides
 *		information about the controller.
 * @qspi:	Pointer to the spi_device structure
 * @transfer:	Pointer to the spi_transfer structure which provide information
 *		about next transfer parameters
 *
 * This function fills the TX FIFO, starts the QSPI transfer, and waits for the
 * transfer to be completed.
 *
 * Return:	Number of bytes transferred in the last transfer
 */
static int zynqmp_qspi_start_transfer(struct spi_master *master,
				      struct spi_device *qspi,
				      struct spi_transfer *transfer)
{
	struct zynqmp_qspi *xqspi = spi_master_get_devdata(master);
	u32 genfifoentry = 0x0, transfer_len;

	xqspi->txbuf = transfer->tx_buf;
	xqspi->rxbuf = transfer->rx_buf;

	zynqmp_qspi_setup_transfer(qspi, transfer);

	genfifoentry |= xqspi->genfifocs;
	genfifoentry |= xqspi->genfifobus;

	zynqmp_qspi_txrxsetup(xqspi, transfer, &genfifoentry);

	if (xqspi->mode == GQSPI_MODE_DMA)
		transfer_len = xqspi->dma_rx_bytes;
	else
		transfer_len = transfer->len;

	xqspi->genfifoentry = genfifoentry;
	if ((transfer_len) < GQSPI_GENFIFO_IMM_DATA_MASK) {
		genfifoentry &= ~GQSPI_GENFIFO_IMM_DATA_MASK;
		genfifoentry |= transfer_len;
		zynqmp_gqspi_write(xqspi, GQSPI_GEN_FIFO_OFST, genfifoentry);
	} else {
		int tempcount = transfer_len;
		u32 exponent = 8;	/* 2^8 = 256 */
		u8 imm_data = tempcount & 0xFF;

		tempcount &= ~(tempcount & 0xFF);
		/* Immediate entry */
		if (tempcount != 0) {
			/* Exponent entries */
			genfifoentry |= GQSPI_GENFIFO_EXP;
			while (tempcount != 0) {
				if (tempcount & GQSPI_GENFIFO_EXP_START) {
					genfifoentry &=
					    ~GQSPI_GENFIFO_IMM_DATA_MASK;
					genfifoentry |= exponent;
					zynqmp_gqspi_write(xqspi,
							   GQSPI_GEN_FIFO_OFST,
							   genfifoentry);
				}
				tempcount = tempcount >> 1;
				exponent++;
			}
		}
		if (imm_data != 0) {
			genfifoentry &= ~GQSPI_GENFIFO_EXP;
			genfifoentry &= ~GQSPI_GENFIFO_IMM_DATA_MASK;
			genfifoentry |= (u8) (imm_data & 0xFF);
			zynqmp_gqspi_write(xqspi,
					   GQSPI_GEN_FIFO_OFST, genfifoentry);
		}
	}

	if ((xqspi->mode == GQSPI_MODE_IO) &&
			(xqspi->rxbuf != NULL)) {
		/* Dummy generic FIFO entry */
		zynqmp_gqspi_write(xqspi, GQSPI_GEN_FIFO_OFST, 0x0);
	}

	/* Since we are using manual mode */
	zynqmp_gqspi_write(xqspi, GQSPI_CONFIG_OFST,
			   zynqmp_gqspi_read(xqspi, GQSPI_CONFIG_OFST) |
			   GQSPI_CFG_START_GEN_FIFO_MASK);

	if (xqspi->txbuf != NULL)
		/* Enable interrupts for TX */
		zynqmp_gqspi_write(xqspi, GQSPI_IER_OFST,
				   GQSPI_IER_TXEMPTY_MASK |
					GQSPI_IER_GENFIFOEMPTY_MASK |
					GQSPI_IER_TXNOT_FULL_MASK);

	if (xqspi->rxbuf != NULL) {
		/* Enable interrupts for RX */
		if (xqspi->mode == GQSPI_MODE_DMA) {
			/* Enable DMA interrupts */
			zynqmp_gqspi_write(xqspi,
					GQSPI_QSPIDMA_DST_I_EN_OFST,
					GQSPI_QSPIDMA_DST_I_EN_DONE_MASK);
		} else {
			zynqmp_gqspi_write(xqspi, GQSPI_IER_OFST,
					GQSPI_IER_GENFIFOEMPTY_MASK |
					GQSPI_IER_RXNEMPTY_MASK |
					GQSPI_IER_RXEMPTY_MASK);
		}
	}

	return transfer->len;
}

/**
 * zynqmp_qspi_suspend:	Suspend method for the QSPI driver
 * @_dev:	Address of the platform_device structure
 *
 * This function stops the QSPI driver queue and disables the QSPI controller
 *
 * Return:	Always 0
 */
static int __maybe_unused zynqmp_qspi_suspend(struct device *dev)
{
	struct spi_master *master = dev_get_drvdata(dev);

	spi_master_suspend(master);

	zynqmp_unprepare_transfer_hardware(master);

	return 0;
}

/**
 * zynqmp_qspi_resume:	Resume method for the QSPI driver
 * @dev:	Address of the platform_device structure
 *
 * The function starts the QSPI driver queue and initializes the QSPI
 * controller
 *
 * Return:	0 on success; error value otherwise
 */
static int __maybe_unused zynqmp_qspi_resume(struct device *dev)
{
	struct spi_master *master = dev_get_drvdata(dev);
	struct zynqmp_qspi *xqspi = spi_master_get_devdata(master);
	int ret = 0;

	ret = clk_enable(xqspi->pclk);
	if (ret) {
		dev_err(dev, "Cannot enable APB clock.\n");
		return ret;
	}

	ret = clk_enable(xqspi->refclk);
	if (ret) {
		dev_err(dev, "Cannot enable device clock.\n");
		clk_disable(xqspi->pclk);
		return ret;
	}

	spi_master_resume(master);

	clk_disable(xqspi->refclk);
	clk_disable(xqspi->pclk);
	return 0;
}

/**
 * zynqmp_runtime_suspend - Runtime suspend method for the SPI driver
 * @dev:	Address of the platform_device structure
 *
 * This function disables the clocks
 *
 * Return:	Always 0
 */
static int __maybe_unused zynqmp_runtime_suspend(struct device *dev)
{
	struct spi_master *master = dev_get_drvdata(dev);
	struct zynqmp_qspi *xqspi = spi_master_get_devdata(master);

	clk_disable(xqspi->refclk);
	clk_disable(xqspi->pclk);

	return 0;
}

/**
 * zynqmp_runtime_resume - Runtime resume method for the SPI driver
 * @dev:	Address of the platform_device structure
 *
 * This function enables the clocks
 *
 * Return:	0 on success and error value on error
 */
static int __maybe_unused zynqmp_runtime_resume(struct device *dev)
{
	struct spi_master *master = dev_get_drvdata(dev);
	struct zynqmp_qspi *xqspi = spi_master_get_devdata(master);
	int ret;

	ret = clk_enable(xqspi->pclk);
	if (ret) {
		dev_err(dev, "Cannot enable APB clock.\n");
		return ret;
	}

	ret = clk_enable(xqspi->refclk);
	if (ret) {
		dev_err(dev, "Cannot enable device clock.\n");
		clk_disable(xqspi->pclk);
		return ret;
	}

	return 0;
}

static const struct dev_pm_ops zynqmp_qspi_dev_pm_ops = {
	SET_RUNTIME_PM_OPS(zynqmp_runtime_suspend,
			   zynqmp_runtime_resume, NULL)
	SET_SYSTEM_SLEEP_PM_OPS(zynqmp_qspi_suspend, zynqmp_qspi_resume)
};

/**
 * zynqmp_qspi_probe:	Probe method for the QSPI driver
 * @pdev:	Pointer to the platform_device structure
 *
 * This function initializes the driver data structures and the hardware.
 *
 * Return:	0 on success; error value otherwise
 */
static int zynqmp_qspi_probe(struct platform_device *pdev)
{
	int ret = 0;
	struct spi_master *master;
	struct zynqmp_qspi *xqspi;
	struct resource *res;
	struct device *dev = &pdev->dev;

	master = spi_alloc_master(&pdev->dev, sizeof(*xqspi));
	if (!master)
		return -ENOMEM;

	xqspi = spi_master_get_devdata(master);
	master->dev.of_node = pdev->dev.of_node;
	platform_set_drvdata(pdev, master);

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	xqspi->regs = devm_ioremap_resource(&pdev->dev, res);
	if (IS_ERR(xqspi->regs)) {
		ret = PTR_ERR(xqspi->regs);
		goto remove_master;
	}

	xqspi->dev = dev;
	xqspi->pclk = devm_clk_get(&pdev->dev, "pclk");
	if (IS_ERR(xqspi->pclk)) {
		dev_err(dev, "pclk clock not found.\n");
		ret = PTR_ERR(xqspi->pclk);
		goto remove_master;
	}

	ret = clk_prepare_enable(xqspi->pclk);
	if (ret) {
		dev_err(dev, "Unable to enable APB clock.\n");
		goto remove_master;
	}

	xqspi->refclk = devm_clk_get(&pdev->dev, "ref_clk");
	if (IS_ERR(xqspi->refclk)) {
		dev_err(dev, "ref_clk clock not found.\n");
		ret = PTR_ERR(xqspi->refclk);
		goto clk_dis_pclk;
	}

	ret = clk_prepare_enable(xqspi->refclk);
	if (ret) {
		dev_err(dev, "Unable to enable device clock.\n");
		goto clk_dis_pclk;
	}

	pm_runtime_use_autosuspend(&pdev->dev);
	pm_runtime_set_autosuspend_delay(&pdev->dev, SPI_AUTOSUSPEND_TIMEOUT);
	pm_runtime_set_active(&pdev->dev);
	pm_runtime_enable(&pdev->dev);
	/* QSPI controller initializations */
	zynqmp_qspi_init_hw(xqspi);

	pm_runtime_mark_last_busy(&pdev->dev);
	pm_runtime_put_autosuspend(&pdev->dev);
	xqspi->irq = platform_get_irq(pdev, 0);
	if (xqspi->irq <= 0) {
		ret = -ENXIO;
		dev_err(dev, "irq resource not found\n");
		goto clk_dis_all;
	}
	ret = devm_request_irq(&pdev->dev, xqspi->irq, zynqmp_qspi_irq,
			       0, pdev->name, master);
	if (ret != 0) {
		ret = -ENXIO;
		dev_err(dev, "request_irq failed\n");
		goto clk_dis_all;
	}

	master->num_chipselect = GQSPI_DEFAULT_NUM_CS;

	master->setup = zynqmp_qspi_setup;
	master->set_cs = zynqmp_qspi_chipselect;
	master->transfer_one = zynqmp_qspi_start_transfer;
	master->prepare_transfer_hardware = zynqmp_prepare_transfer_hardware;
	master->unprepare_transfer_hardware =
					zynqmp_unprepare_transfer_hardware;
	master->max_speed_hz = clk_get_rate(xqspi->refclk) / 2;
	master->bits_per_word_mask = SPI_BPW_MASK(8);
	master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_RX_DUAL | SPI_RX_QUAD |
			    SPI_TX_DUAL | SPI_TX_QUAD;

	if (master->dev.parent == NULL)
		master->dev.parent = &master->dev;

	ret = spi_register_master(master);
	if (ret)
		goto clk_dis_all;

	return 0;

clk_dis_all:
	pm_runtime_set_suspended(&pdev->dev);
	pm_runtime_disable(&pdev->dev);
	clk_disable_unprepare(xqspi->refclk);
clk_dis_pclk:
	clk_disable_unprepare(xqspi->pclk);
remove_master:
	spi_master_put(master);

	return ret;
}

/**
 * zynqmp_qspi_remove:	Remove method for the QSPI driver
 * @pdev:	Pointer to the platform_device structure
 *
 * This function is called if a device is physically removed from the system or
 * if the driver module is being unloaded. It frees all resources allocated to
 * the device.
 *
 * Return:	0 Always
 */
static int zynqmp_qspi_remove(struct platform_device *pdev)
{
	struct spi_master *master = platform_get_drvdata(pdev);
	struct zynqmp_qspi *xqspi = spi_master_get_devdata(master);

	zynqmp_gqspi_write(xqspi, GQSPI_EN_OFST, 0x0);
	clk_disable_unprepare(xqspi->refclk);
	clk_disable_unprepare(xqspi->pclk);
	pm_runtime_set_suspended(&pdev->dev);
	pm_runtime_disable(&pdev->dev);

	spi_unregister_master(master);

	return 0;
}

static const struct of_device_id zynqmp_qspi_of_match[] = {
	{ .compatible = "xlnx,zynqmp-qspi-1.0", },
	{ /* End of table */ }
};

MODULE_DEVICE_TABLE(of, zynqmp_qspi_of_match);

static struct platform_driver zynqmp_qspi_driver = {
	.probe = zynqmp_qspi_probe,
	.remove = zynqmp_qspi_remove,
	.driver = {
		.name = "zynqmp-qspi",
		.of_match_table = zynqmp_qspi_of_match,
		.pm = &zynqmp_qspi_dev_pm_ops,
	},
};

module_platform_driver(zynqmp_qspi_driver);

MODULE_AUTHOR("Xilinx, Inc.");
MODULE_DESCRIPTION("Xilinx Zynqmp QSPI driver");
MODULE_LICENSE("GPL");