summaryrefslogtreecommitdiff
path: root/drivers/mmc/host/sunxi-mmc.c
blob: 024f67c98cdcad3b741e3b5ec39ad8b17a670d8c (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
/*
 * Driver for sunxi SD/MMC host controllers
 * (C) Copyright 2007-2011 Reuuimlla Technology Co., Ltd.
 * (C) Copyright 2007-2011 Aaron Maoye <leafy.myeh@reuuimllatech.com>
 * (C) Copyright 2013-2014 O2S GmbH <www.o2s.ch>
 * (C) Copyright 2013-2014 David Lanzend�rfer <david.lanzendoerfer@o2s.ch>
 * (C) Copyright 2013-2014 Hans de Goede <hdegoede@redhat.com>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of
 * the License, or (at your option) any later version.
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/io.h>
#include <linux/device.h>
#include <linux/interrupt.h>
#include <linux/delay.h>
#include <linux/err.h>

#include <linux/clk.h>
#include <linux/clk-private.h>
#include <linux/clk/sunxi.h>

#include <linux/gpio.h>
#include <linux/platform_device.h>
#include <linux/spinlock.h>
#include <linux/scatterlist.h>
#include <linux/dma-mapping.h>
#include <linux/slab.h>
#include <linux/reset.h>

#include <linux/of_address.h>
#include <linux/of_gpio.h>
#include <linux/of_platform.h>

#include <linux/mmc/host.h>
#include <linux/mmc/sd.h>
#include <linux/mmc/sdio.h>
#include <linux/mmc/mmc.h>
#include <linux/mmc/core.h>
#include <linux/mmc/card.h>
#include <linux/mmc/slot-gpio.h>

/* register offset definitions */
#define SDXC_REG_GCTRL	(0x00) /* SMC Global Control Register */
#define SDXC_REG_CLKCR	(0x04) /* SMC Clock Control Register */
#define SDXC_REG_TMOUT	(0x08) /* SMC Time Out Register */
#define SDXC_REG_WIDTH	(0x0C) /* SMC Bus Width Register */
#define SDXC_REG_BLKSZ	(0x10) /* SMC Block Size Register */
#define SDXC_REG_BCNTR	(0x14) /* SMC Byte Count Register */
#define SDXC_REG_CMDR	(0x18) /* SMC Command Register */
#define SDXC_REG_CARG	(0x1C) /* SMC Argument Register */
#define SDXC_REG_RESP0	(0x20) /* SMC Response Register 0 */
#define SDXC_REG_RESP1	(0x24) /* SMC Response Register 1 */
#define SDXC_REG_RESP2	(0x28) /* SMC Response Register 2 */
#define SDXC_REG_RESP3	(0x2C) /* SMC Response Register 3 */
#define SDXC_REG_IMASK	(0x30) /* SMC Interrupt Mask Register */
#define SDXC_REG_MISTA	(0x34) /* SMC Masked Interrupt Status Register */
#define SDXC_REG_RINTR	(0x38) /* SMC Raw Interrupt Status Register */
#define SDXC_REG_STAS	(0x3C) /* SMC Status Register */
#define SDXC_REG_FTRGL	(0x40) /* SMC FIFO Threshold Watermark Registe */
#define SDXC_REG_FUNS	(0x44) /* SMC Function Select Register */
#define SDXC_REG_CBCR	(0x48) /* SMC CIU Byte Count Register */
#define SDXC_REG_BBCR	(0x4C) /* SMC BIU Byte Count Register */
#define SDXC_REG_DBGC	(0x50) /* SMC Debug Enable Register */
#define SDXC_REG_HWRST	(0x78) /* SMC Card Hardware Reset for Register */
#define SDXC_REG_DMAC	(0x80) /* SMC IDMAC Control Register */
#define SDXC_REG_DLBA	(0x84) /* SMC IDMAC Descriptor List Base Addre */
#define SDXC_REG_IDST	(0x88) /* SMC IDMAC Status Register */
#define SDXC_REG_IDIE	(0x8C) /* SMC IDMAC Interrupt Enable Register */
#define SDXC_REG_CHDA	(0x90)
#define SDXC_REG_CBDA	(0x94)

#define mmc_readl(host, reg) \
	readl((host)->reg_base + SDXC_##reg)
#define mmc_writel(host, reg, value) \
	writel((value), (host)->reg_base + SDXC_##reg)

/* global control register bits */
#define SDXC_SOFT_RESET			BIT(0)
#define SDXC_FIFO_RESET			BIT(1)
#define SDXC_DMA_RESET			BIT(2)
#define SDXC_INTERRUPT_ENABLE_BIT	BIT(4)
#define SDXC_DMA_ENABLE_BIT		BIT(5)
#define SDXC_DEBOUNCE_ENABLE_BIT	BIT(8)
#define SDXC_POSEDGE_LATCH_DATA		BIT(9)
#define SDXC_DDR_MODE			BIT(10)
#define SDXC_MEMORY_ACCESS_DONE		BIT(29)
#define SDXC_ACCESS_DONE_DIRECT		BIT(30)
#define SDXC_ACCESS_BY_AHB		BIT(31)
#define SDXC_ACCESS_BY_DMA		(0 << 31)
#define SDXC_HARDWARE_RESET \
	(SDXC_SOFT_RESET | SDXC_FIFO_RESET | SDXC_DMA_RESET)

/* clock control bits */
#define SDXC_CARD_CLOCK_ON		BIT(16)
#define SDXC_LOW_POWER_ON		BIT(17)

/* bus width */
#define SDXC_WIDTH1			0
#define SDXC_WIDTH4			1
#define SDXC_WIDTH8			2

/* smc command bits */
#define SDXC_RESP_EXPIRE		BIT(6)
#define SDXC_LONG_RESPONSE		BIT(7)
#define SDXC_CHECK_RESPONSE_CRC		BIT(8)
#define SDXC_DATA_EXPIRE		BIT(9)
#define SDXC_WRITE			BIT(10)
#define SDXC_SEQUENCE_MODE		BIT(11)
#define SDXC_SEND_AUTO_STOP		BIT(12)
#define SDXC_WAIT_PRE_OVER		BIT(13)
#define SDXC_STOP_ABORT_CMD		BIT(14)
#define SDXC_SEND_INIT_SEQUENCE		BIT(15)
#define SDXC_UPCLK_ONLY			BIT(21)
#define SDXC_READ_CEATA_DEV		BIT(22)
#define SDXC_CCS_EXPIRE			BIT(23)
#define SDXC_ENABLE_BIT_BOOT		BIT(24)
#define SDXC_ALT_BOOT_OPTIONS		BIT(25)
#define SDXC_BOOT_ACK_EXPIRE		BIT(26)
#define SDXC_BOOT_ABORT			BIT(27)
#define SDXC_VOLTAGE_SWITCH	        BIT(28)
#define SDXC_USE_HOLD_REGISTER	        BIT(29)
#define SDXC_START			BIT(31)

/* interrupt bits */
#define SDXC_RESP_ERROR			BIT(1)
#define SDXC_COMMAND_DONE		BIT(2)
#define SDXC_DATA_OVER			BIT(3)
#define SDXC_TX_DATA_REQUEST		BIT(4)
#define SDXC_RX_DATA_REQUEST		BIT(5)
#define SDXC_RESP_CRC_ERROR		BIT(6)
#define SDXC_DATA_CRC_ERROR		BIT(7)
#define SDXC_RESP_TIMEOUT		BIT(8)
#define SDXC_DATA_TIMEOUT		BIT(9)
#define SDXC_VOLTAGE_CHANGE_DONE	BIT(10)
#define SDXC_FIFO_RUN_ERROR		BIT(11)
#define SDXC_HARD_WARE_LOCKED		BIT(12)
#define SDXC_START_BIT_ERROR		BIT(13)
#define SDXC_AUTO_COMMAND_DONE		BIT(14)
#define SDXC_END_BIT_ERROR		BIT(15)
#define SDXC_SDIO_INTERRUPT		BIT(16)
#define SDXC_CARD_INSERT		BIT(30)
#define SDXC_CARD_REMOVE		BIT(31)
#define SDXC_INTERRUPT_ERROR_BIT \
	(SDXC_RESP_ERROR | SDXC_RESP_CRC_ERROR | SDXC_DATA_CRC_ERROR | \
	 SDXC_RESP_TIMEOUT | SDXC_DATA_TIMEOUT | SDXC_FIFO_RUN_ERROR | \
	 SDXC_HARD_WARE_LOCKED | SDXC_START_BIT_ERROR | SDXC_END_BIT_ERROR)
#define SDXC_INTERRUPT_DONE_BIT \
	(SDXC_AUTO_COMMAND_DONE | SDXC_DATA_OVER | \
	 SDXC_COMMAND_DONE | SDXC_VOLTAGE_CHANGE_DONE)

/* status */
#define SDXC_RXWL_FLAG			BIT(0)
#define SDXC_TXWL_FLAG			BIT(1)
#define SDXC_FIFO_EMPTY			BIT(2)
#define SDXC_FIFO_FULL			BIT(3)
#define SDXC_CARD_PRESENT		BIT(8)
#define SDXC_CARD_DATA_BUSY		BIT(9)
#define SDXC_DATA_FSM_BUSY		BIT(10)
#define SDXC_DMA_REQUEST		BIT(31)
#define SDXC_FIFO_SIZE			16

/* Function select */
#define SDXC_CEATA_ON			(0xceaa << 16)
#define SDXC_SEND_IRQ_RESPONSE		BIT(0)
#define SDXC_SDIO_READ_WAIT		BIT(1)
#define SDXC_ABORT_READ_DATA		BIT(2)
#define SDXC_SEND_CCSD			BIT(8)
#define SDXC_SEND_AUTO_STOPCCSD		BIT(9)
#define SDXC_CEATA_DEV_IRQ_ENABLE	BIT(10)

/* IDMA controller bus mod bit field */
#define SDXC_IDMAC_SOFT_RESET		BIT(0)
#define SDXC_IDMAC_FIX_BURST		BIT(1)
#define SDXC_IDMAC_IDMA_ON		BIT(7)
#define SDXC_IDMAC_REFETCH_DES		BIT(31)

/* IDMA status bit field */
#define SDXC_IDMAC_TRANSMIT_INTERRUPT		BIT(0)
#define SDXC_IDMAC_RECEIVE_INTERRUPT		BIT(1)
#define SDXC_IDMAC_FATAL_BUS_ERROR		BIT(2)
#define SDXC_IDMAC_DESTINATION_INVALID		BIT(4)
#define SDXC_IDMAC_CARD_ERROR_SUM		BIT(5)
#define SDXC_IDMAC_NORMAL_INTERRUPT_SUM		BIT(8)
#define SDXC_IDMAC_ABNORMAL_INTERRUPT_SUM	BIT(9)
#define SDXC_IDMAC_HOST_ABORT_INTERRUPT		BIT(10)
#define SDXC_IDMAC_IDLE				(0 << 13)
#define SDXC_IDMAC_SUSPEND			(1 << 13)
#define SDXC_IDMAC_DESC_READ			(2 << 13)
#define SDXC_IDMAC_DESC_CHECK			(3 << 13)
#define SDXC_IDMAC_READ_REQUEST_WAIT		(4 << 13)
#define SDXC_IDMAC_WRITE_REQUEST_WAIT		(5 << 13)
#define SDXC_IDMAC_READ				(6 << 13)
#define SDXC_IDMAC_WRITE			(7 << 13)
#define SDXC_IDMAC_DESC_CLOSE			(8 << 13)

/*
* If the idma-des-size-bits of property is ie 13, bufsize bits are:
*  Bits  0-12: buf1 size
*  Bits 13-25: buf2 size
*  Bits 26-31: not used
* Since we only ever set buf1 size, we can simply store it directly.
*/
#define SDXC_IDMAC_DES0_DIC	BIT(1)  /* disable interrupt on completion */
#define SDXC_IDMAC_DES0_LD	BIT(2)  /* last descriptor */
#define SDXC_IDMAC_DES0_FD	BIT(3)  /* first descriptor */
#define SDXC_IDMAC_DES0_CH	BIT(4)  /* chain mode */
#define SDXC_IDMAC_DES0_ER	BIT(5)  /* end of ring */
#define SDXC_IDMAC_DES0_CES	BIT(30) /* card error summary */
#define SDXC_IDMAC_DES0_OWN	BIT(31) /* 1-idma owns it, 0-host owns it */

struct sunxi_idma_des {
	u32	config;
	u32	buf_size;
	u32	buf_addr_ptr1;
	u32	buf_addr_ptr2;
};

struct sunxi_mmc_host {
	struct mmc_host	*mmc;
	struct reset_control *reset;

	/* IO mapping base */
	void __iomem	*reg_base;

	/* clock management */
	struct clk	*clk_ahb;
	struct clk	*clk_mmc;

	/* irq */
	spinlock_t	lock;
	int		irq;
	u32		int_sum;
	u32		sdio_imask;

	/* dma */
	u32		idma_des_size_bits;
	dma_addr_t	sg_dma;
	void		*sg_cpu;
	bool		wait_dma;

	struct mmc_request *mrq;
	struct mmc_request *manual_stop_mrq;
	int		ferror;
};

static int sunxi_mmc_reset_host(struct sunxi_mmc_host *host)
{
	unsigned long expire = jiffies + msecs_to_jiffies(250);
	u32 rval;

	mmc_writel(host, REG_CMDR, SDXC_HARDWARE_RESET);
	do {
		rval = mmc_readl(host, REG_GCTRL);
	} while (time_before(jiffies, expire) && (rval & SDXC_HARDWARE_RESET));

	if (rval & SDXC_HARDWARE_RESET) {
		dev_err(mmc_dev(host->mmc), "fatal err reset timeout\n");
		return -EIO;
	}

	return 0;
}

static int sunxi_mmc_init_host(struct mmc_host *mmc)
{
	u32 rval;
	struct sunxi_mmc_host *host = mmc_priv(mmc);

	if (sunxi_mmc_reset_host(host))
		return -EIO;

	mmc_writel(host, REG_FTRGL, 0x20070008);
	mmc_writel(host, REG_TMOUT, 0xffffffff);
	mmc_writel(host, REG_IMASK, host->sdio_imask);
	mmc_writel(host, REG_RINTR, 0xffffffff);
	mmc_writel(host, REG_DBGC, 0xdeb);
	mmc_writel(host, REG_FUNS, SDXC_CEATA_ON);
	mmc_writel(host, REG_DLBA, host->sg_dma);

	rval = mmc_readl(host, REG_GCTRL);
	rval |= SDXC_INTERRUPT_ENABLE_BIT;
	rval &= ~SDXC_ACCESS_DONE_DIRECT;
	mmc_writel(host, REG_GCTRL, rval);

	return 0;
}

static void sunxi_mmc_init_idma_des(struct sunxi_mmc_host *host,
				    struct mmc_data *data)
{
	struct sunxi_idma_des *pdes = (struct sunxi_idma_des *)host->sg_cpu;
	struct sunxi_idma_des *pdes_pa = (struct sunxi_idma_des *)host->sg_dma;
	int i, max_len = (1 << host->idma_des_size_bits);

	for (i = 0; i < data->sg_len; i++) {
		pdes[i].config = SDXC_IDMAC_DES0_CH | SDXC_IDMAC_DES0_OWN |
				 SDXC_IDMAC_DES0_DIC;

		if (data->sg[i].length == max_len)
			pdes[i].buf_size = 0; /* 0 == max_len */
		else
			pdes[i].buf_size = data->sg[i].length;

		pdes[i].buf_addr_ptr1 = sg_dma_address(&data->sg[i]);
		pdes[i].buf_addr_ptr2 = (u32)&pdes_pa[i + 1];
	}

	pdes[0].config |= SDXC_IDMAC_DES0_FD;
	pdes[i - 1].config = SDXC_IDMAC_DES0_OWN | SDXC_IDMAC_DES0_LD;

	/*
	 * Avoid the io-store starting the idmac hitting io-mem before the
	 * descriptors hit the main-mem.
	 */
	wmb();
}

static enum dma_data_direction sunxi_mmc_get_dma_dir(struct mmc_data *data)
{
	if (data->flags & MMC_DATA_WRITE)
		return DMA_TO_DEVICE;
	else
		return DMA_FROM_DEVICE;
}

static int sunxi_mmc_map_dma(struct sunxi_mmc_host *host,
			     struct mmc_data *data)
{
	u32 i, dma_len;
	struct scatterlist *sg;

	dma_len = dma_map_sg(mmc_dev(host->mmc), data->sg, data->sg_len,
			     sunxi_mmc_get_dma_dir(data));
	if (dma_len == 0) {
		dev_err(mmc_dev(host->mmc), "dma_map_sg failed\n");
		return -ENOMEM;
	}

	for_each_sg(data->sg, sg, data->sg_len, i) {
		if (sg->offset & 3 || sg->length & 3) {
			dev_err(mmc_dev(host->mmc),
				"unaligned scatterlist: os %x length %d\n",
				sg->offset, sg->length);
			return -EINVAL;
		}
	}

	return 0;
}

static void sunxi_mmc_start_dma(struct sunxi_mmc_host *host,
				struct mmc_data *data)
{
	u32 rval;

	sunxi_mmc_init_idma_des(host, data);

	rval = mmc_readl(host, REG_GCTRL);
	rval |= SDXC_DMA_ENABLE_BIT;
	mmc_writel(host, REG_GCTRL, rval);
	rval |= SDXC_DMA_RESET;
	mmc_writel(host, REG_GCTRL, rval);

	mmc_writel(host, REG_DMAC, SDXC_IDMAC_SOFT_RESET);

	if (!(data->flags & MMC_DATA_WRITE))
		mmc_writel(host, REG_IDIE, SDXC_IDMAC_RECEIVE_INTERRUPT);

	mmc_writel(host, REG_DMAC,
		   SDXC_IDMAC_FIX_BURST | SDXC_IDMAC_IDMA_ON);
}

static void sunxi_mmc_send_manual_stop(struct sunxi_mmc_host *host,
				       struct mmc_request *req)
{
	u32 arg, cmd_val, ri;
	unsigned long expire = jiffies + msecs_to_jiffies(1000);

	cmd_val = SDXC_START | SDXC_RESP_EXPIRE |
		  SDXC_STOP_ABORT_CMD | SDXC_CHECK_RESPONSE_CRC;

	if (req->cmd->opcode == SD_IO_RW_EXTENDED) {
		cmd_val |= SD_IO_RW_DIRECT;
		arg = (1 << 31) | (0 << 28) | (SDIO_CCCR_ABORT << 9) |
		      ((req->cmd->arg >> 28) & 0x7);
	} else {
		cmd_val |= MMC_STOP_TRANSMISSION;
		arg = 0;
	}

	mmc_writel(host, REG_CARG, arg);
	mmc_writel(host, REG_CMDR, cmd_val);

	do {
		ri = mmc_readl(host, REG_RINTR);
	} while (!(ri & (SDXC_COMMAND_DONE | SDXC_INTERRUPT_ERROR_BIT)) &&
		 time_before(jiffies, expire));

	if (!(ri & SDXC_COMMAND_DONE) || (ri & SDXC_INTERRUPT_ERROR_BIT)) {
		dev_err(mmc_dev(host->mmc), "send stop command failed\n");
		if (req->stop)
			req->stop->resp[0] = -ETIMEDOUT;
	} else {
		if (req->stop)
			req->stop->resp[0] = mmc_readl(host, REG_RESP0);
	}

	mmc_writel(host, REG_RINTR, 0xffff);
}

static void sunxi_mmc_dump_errinfo(struct sunxi_mmc_host *host)
{
	struct mmc_command *cmd = host->mrq->cmd;
	struct mmc_data *data = host->mrq->data;

	/* For some cmds timeout is normal with sd/mmc cards */
	if ((host->int_sum & SDXC_INTERRUPT_ERROR_BIT) ==
		SDXC_RESP_TIMEOUT && (cmd->opcode == SD_IO_SEND_OP_COND ||
				      cmd->opcode == SD_IO_RW_DIRECT))
		return;

	dev_err(mmc_dev(host->mmc),
		"smc %d err, cmd %d,%s%s%s%s%s%s%s%s%s%s !!\n",
		host->mmc->index, cmd->opcode,
		data ? (data->flags & MMC_DATA_WRITE ? " WR" : " RD") : "",
		host->int_sum & SDXC_RESP_ERROR     ? " RE"     : "",
		host->int_sum & SDXC_RESP_CRC_ERROR  ? " RCE"    : "",
		host->int_sum & SDXC_DATA_CRC_ERROR  ? " DCE"    : "",
		host->int_sum & SDXC_RESP_TIMEOUT ? " RTO"    : "",
		host->int_sum & SDXC_DATA_TIMEOUT ? " DTO"    : "",
		host->int_sum & SDXC_FIFO_RUN_ERROR  ? " FE"     : "",
		host->int_sum & SDXC_HARD_WARE_LOCKED ? " HL"     : "",
		host->int_sum & SDXC_START_BIT_ERROR ? " SBE"    : "",
		host->int_sum & SDXC_END_BIT_ERROR   ? " EBE"    : ""
		);
}

/* Called in interrupt context! */
static irqreturn_t sunxi_mmc_finalize_request(struct sunxi_mmc_host *host)
{
	struct mmc_request *mrq = host->mrq;
	struct mmc_data *data = mrq->data;
	u32 rval;

	mmc_writel(host, REG_IMASK, host->sdio_imask);
	mmc_writel(host, REG_IDIE, 0);

	if (host->int_sum & SDXC_INTERRUPT_ERROR_BIT) {
		sunxi_mmc_dump_errinfo(host);
		mrq->cmd->error = -ETIMEDOUT;

		if (data) {
			data->error = -ETIMEDOUT;
			host->manual_stop_mrq = mrq;
		}

		if (mrq->stop)
			mrq->stop->error = -ETIMEDOUT;
	} else {
		if (mrq->cmd->flags & MMC_RSP_136) {
			mrq->cmd->resp[0] = mmc_readl(host, REG_RESP3);
			mrq->cmd->resp[1] = mmc_readl(host, REG_RESP2);
			mrq->cmd->resp[2] = mmc_readl(host, REG_RESP1);
			mrq->cmd->resp[3] = mmc_readl(host, REG_RESP0);
		} else {
			mrq->cmd->resp[0] = mmc_readl(host, REG_RESP0);
		}

		if (data)
			data->bytes_xfered = data->blocks * data->blksz;
	}

	if (data) {
		mmc_writel(host, REG_IDST, 0x337);
		mmc_writel(host, REG_DMAC, 0);
		rval = mmc_readl(host, REG_GCTRL);
		rval |= SDXC_DMA_RESET;
		mmc_writel(host, REG_GCTRL, rval);
		rval &= ~SDXC_DMA_ENABLE_BIT;
		mmc_writel(host, REG_GCTRL, rval);
		rval |= SDXC_FIFO_RESET;
		mmc_writel(host, REG_GCTRL, rval);
		dma_unmap_sg(mmc_dev(host->mmc), data->sg, data->sg_len,
				     sunxi_mmc_get_dma_dir(data));
	}

	mmc_writel(host, REG_RINTR, 0xffff);

	host->mrq = NULL;
	host->int_sum = 0;
	host->wait_dma = false;

	return host->manual_stop_mrq ? IRQ_WAKE_THREAD : IRQ_HANDLED;
}

static irqreturn_t sunxi_mmc_irq(int irq, void *dev_id)
{
	struct sunxi_mmc_host *host = dev_id;
	struct mmc_request *mrq;
	u32 msk_int, idma_int;
	bool finalize = false;
	bool sdio_int = false;
	irqreturn_t ret = IRQ_HANDLED;

	spin_lock(&host->lock);

	idma_int  = mmc_readl(host, REG_IDST);
	msk_int   = mmc_readl(host, REG_MISTA);

	dev_dbg(mmc_dev(host->mmc), "irq: rq %p mi %08x idi %08x\n",
		host->mrq, msk_int, idma_int);

	mrq = host->mrq;
	if (mrq) {
		if (idma_int & SDXC_IDMAC_RECEIVE_INTERRUPT)
			host->wait_dma = false;

		host->int_sum |= msk_int;

		/* Wait for COMMAND_DONE on RESPONSE_TIMEOUT before finalize */
		if ((host->int_sum & SDXC_RESP_TIMEOUT) &&
				!(host->int_sum & SDXC_COMMAND_DONE))
			mmc_writel(host, REG_IMASK,
				   host->sdio_imask | SDXC_COMMAND_DONE);
		/* Don't wait for dma on error */
		else if (host->int_sum & SDXC_INTERRUPT_ERROR_BIT)
			finalize = true;
		else if ((host->int_sum & SDXC_INTERRUPT_DONE_BIT) &&
				!host->wait_dma)
			finalize = true;
	}

	if (msk_int & SDXC_SDIO_INTERRUPT)
		sdio_int = true;

	mmc_writel(host, REG_RINTR, msk_int);
	mmc_writel(host, REG_IDST, idma_int);

	if (finalize)
		ret = sunxi_mmc_finalize_request(host);

	spin_unlock(&host->lock);

	if (finalize && ret == IRQ_HANDLED)
		mmc_request_done(host->mmc, mrq);

	if (sdio_int)
		mmc_signal_sdio_irq(host->mmc);

	return ret;
}

static irqreturn_t sunxi_mmc_handle_manual_stop(int irq, void *dev_id)
{
	struct sunxi_mmc_host *host = dev_id;
	struct mmc_request *mrq;
	unsigned long iflags;

	spin_lock_irqsave(&host->lock, iflags);
	mrq = host->manual_stop_mrq;
	spin_unlock_irqrestore(&host->lock, iflags);

	if (!mrq) {
		dev_err(mmc_dev(host->mmc), "no request for manual stop\n");
		return IRQ_HANDLED;
	}

	dev_err(mmc_dev(host->mmc), "data error, sending stop command\n");
	sunxi_mmc_send_manual_stop(host, mrq);

	spin_lock_irqsave(&host->lock, iflags);
	host->manual_stop_mrq = NULL;
	spin_unlock_irqrestore(&host->lock, iflags);

	mmc_request_done(host->mmc, mrq);

	return IRQ_HANDLED;
}

static int sunxi_mmc_oclk_onoff(struct sunxi_mmc_host *host, u32 oclk_en)
{
	unsigned long expire = jiffies + msecs_to_jiffies(250);
	u32 rval;

	rval = mmc_readl(host, REG_CLKCR);
	rval &= ~(SDXC_CARD_CLOCK_ON | SDXC_LOW_POWER_ON);

	if (oclk_en)
		rval |= SDXC_CARD_CLOCK_ON;

	mmc_writel(host, REG_CLKCR, rval);

	rval = SDXC_START | SDXC_UPCLK_ONLY | SDXC_WAIT_PRE_OVER;
	mmc_writel(host, REG_CMDR, rval);

	do {
		rval = mmc_readl(host, REG_CMDR);
	} while (time_before(jiffies, expire) && (rval & SDXC_START));

	/* clear irq status bits set by the command */
	mmc_writel(host, REG_RINTR,
		   mmc_readl(host, REG_RINTR) & ~SDXC_SDIO_INTERRUPT);

	if (rval & SDXC_START) {
		dev_err(mmc_dev(host->mmc), "fatal err update clk timeout\n");
		return -EIO;
	}

	return 0;
}

static int sunxi_mmc_clk_set_rate(struct sunxi_mmc_host *host,
				  struct mmc_ios *ios)
{
	u32 rate, oclk_dly, rval, sclk_dly, src_clk;
	int ret;

	rate = clk_round_rate(host->clk_mmc, ios->clock);
	dev_dbg(mmc_dev(host->mmc), "setting clk to %d, rounded %d\n",
		ios->clock, rate);

	/* setting clock rate */
	ret = clk_set_rate(host->clk_mmc, rate);
	if (ret) {
		dev_err(mmc_dev(host->mmc), "error setting clk to %d: %d\n",
			rate, ret);
		return ret;
	}

	ret = sunxi_mmc_oclk_onoff(host, 0);
	if (ret)
		return ret;

	/* clear internal divider */
	rval = mmc_readl(host, REG_CLKCR);
	rval &= ~0xff;
	mmc_writel(host, REG_CLKCR, rval);

	/* determine delays */
	if (rate <= 400000) {
		oclk_dly = 0;
		sclk_dly = 7;
	} else if (rate <= 25000000) {
		oclk_dly = 0;
		sclk_dly = 5;
	} else if (rate <= 50000000) {
		if (ios->timing == MMC_TIMING_UHS_DDR50) {
			oclk_dly = 2;
			sclk_dly = 4;
		} else {
			oclk_dly = 3;
			sclk_dly = 5;
		}
	} else {
		/* rate > 50000000 */
		oclk_dly = 2;
		sclk_dly = 4;
	}

	src_clk = clk_get_rate(clk_get_parent(host->clk_mmc));
	if (src_clk >= 300000000 && src_clk <= 400000000) {
		if (oclk_dly)
			oclk_dly--;
		if (sclk_dly)
			sclk_dly--;
	}

	clk_sunxi_mmc_phase_control(host->clk_mmc, sclk_dly, oclk_dly);

	return sunxi_mmc_oclk_onoff(host, 1);
}

static void sunxi_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
{
	struct sunxi_mmc_host *host = mmc_priv(mmc);
	u32 rval;

	/* Set the power state */
	switch (ios->power_mode) {
	case MMC_POWER_ON:
		break;

	case MMC_POWER_UP:
		mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, ios->vdd);

		host->ferror = sunxi_mmc_init_host(mmc);
		if (host->ferror)
			return;

		dev_dbg(mmc_dev(mmc), "power on!\n");
		break;

	case MMC_POWER_OFF:
		dev_dbg(mmc_dev(mmc), "power off!\n");
		sunxi_mmc_reset_host(host);
		mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, 0);
		break;
	}

	/* set bus width */
	switch (ios->bus_width) {
	case MMC_BUS_WIDTH_1:
		mmc_writel(host, REG_WIDTH, SDXC_WIDTH1);
		break;
	case MMC_BUS_WIDTH_4:
		mmc_writel(host, REG_WIDTH, SDXC_WIDTH4);
		break;
	case MMC_BUS_WIDTH_8:
		mmc_writel(host, REG_WIDTH, SDXC_WIDTH8);
		break;
	}

	/* set ddr mode */
	rval = mmc_readl(host, REG_GCTRL);
	if (ios->timing == MMC_TIMING_UHS_DDR50)
		rval |= SDXC_DDR_MODE;
	else
		rval &= ~SDXC_DDR_MODE;
	mmc_writel(host, REG_GCTRL, rval);

	/* set up clock */
	if (ios->clock && ios->power_mode) {
		host->ferror = sunxi_mmc_clk_set_rate(host, ios);
		/* Android code had a usleep_range(50000, 55000); here */
	}
}

static void sunxi_mmc_enable_sdio_irq(struct mmc_host *mmc, int enable)
{
	struct sunxi_mmc_host *host = mmc_priv(mmc);
	unsigned long flags;
	u32 imask;

	spin_lock_irqsave(&host->lock, flags);

	imask = mmc_readl(host, REG_IMASK);
	if (enable) {
		host->sdio_imask = SDXC_SDIO_INTERRUPT;
		imask |= SDXC_SDIO_INTERRUPT;
	} else {
		host->sdio_imask = 0;
		imask &= ~SDXC_SDIO_INTERRUPT;
	}
	mmc_writel(host, REG_IMASK, imask);
	spin_unlock_irqrestore(&host->lock, flags);
}

static void sunxi_mmc_hw_reset(struct mmc_host *mmc)
{
	struct sunxi_mmc_host *host = mmc_priv(mmc);
	mmc_writel(host, REG_HWRST, 0);
	udelay(10);
	mmc_writel(host, REG_HWRST, 1);
	udelay(300);
}

static void sunxi_mmc_request(struct mmc_host *mmc, struct mmc_request *mrq)
{
	struct sunxi_mmc_host *host = mmc_priv(mmc);
	struct mmc_command *cmd = mrq->cmd;
	struct mmc_data *data = mrq->data;
	unsigned long iflags;
	u32 imask = SDXC_INTERRUPT_ERROR_BIT;
	u32 cmd_val = SDXC_START | (cmd->opcode & 0x3f);
	int ret;

	/* Check for set_ios errors (should never happen) */
	if (host->ferror) {
		mrq->cmd->error = host->ferror;
		mmc_request_done(mmc, mrq);
		return;
	}

	if (data) {
		ret = sunxi_mmc_map_dma(host, data);
		if (ret < 0) {
			dev_err(mmc_dev(mmc), "map DMA failed\n");
			cmd->error = ret;
			data->error = ret;
			mmc_request_done(mmc, mrq);
			return;
		}
	}

	if (cmd->opcode == MMC_GO_IDLE_STATE) {
		cmd_val |= SDXC_SEND_INIT_SEQUENCE;
		imask |= SDXC_COMMAND_DONE;
	}

	if (cmd->flags & MMC_RSP_PRESENT) {
		cmd_val |= SDXC_RESP_EXPIRE;
		if (cmd->flags & MMC_RSP_136)
			cmd_val |= SDXC_LONG_RESPONSE;
		if (cmd->flags & MMC_RSP_CRC)
			cmd_val |= SDXC_CHECK_RESPONSE_CRC;

		if ((cmd->flags & MMC_CMD_MASK) == MMC_CMD_ADTC) {
			cmd_val |= SDXC_DATA_EXPIRE | SDXC_WAIT_PRE_OVER;
			if (cmd->data->flags & MMC_DATA_STREAM) {
				imask |= SDXC_AUTO_COMMAND_DONE;
				cmd_val |= SDXC_SEQUENCE_MODE |
					   SDXC_SEND_AUTO_STOP;
			}

			if (cmd->data->stop) {
				imask |= SDXC_AUTO_COMMAND_DONE;
				cmd_val |= SDXC_SEND_AUTO_STOP;
			} else {
				imask |= SDXC_DATA_OVER;
			}

			if (cmd->data->flags & MMC_DATA_WRITE)
				cmd_val |= SDXC_WRITE;
			else
				host->wait_dma = true;
		} else {
			imask |= SDXC_COMMAND_DONE;
		}
	} else {
		imask |= SDXC_COMMAND_DONE;
	}

	dev_dbg(mmc_dev(mmc), "cmd %d(%08x) arg %x ie 0x%08x len %d\n",
		cmd_val & 0x3f, cmd_val, cmd->arg, imask,
		mrq->data ? mrq->data->blksz * mrq->data->blocks : 0);

	spin_lock_irqsave(&host->lock, iflags);

	if (host->mrq || host->manual_stop_mrq) {
		spin_unlock_irqrestore(&host->lock, iflags);

		if (data)
			dma_unmap_sg(mmc_dev(mmc), data->sg, data->sg_len,
				     sunxi_mmc_get_dma_dir(data));

		dev_err(mmc_dev(mmc), "request already pending\n");
		mrq->cmd->error = -EBUSY;
		mmc_request_done(mmc, mrq);
		return;
	}

	if (data) {
		mmc_writel(host, REG_BLKSZ, data->blksz);
		mmc_writel(host, REG_BCNTR, data->blksz * data->blocks);
		sunxi_mmc_start_dma(host, data);
	}

	host->mrq = mrq;
	mmc_writel(host, REG_IMASK, host->sdio_imask | imask);
	mmc_writel(host, REG_CARG, cmd->arg);
	mmc_writel(host, REG_CMDR, cmd_val);

	spin_unlock_irqrestore(&host->lock, iflags);
}

static const struct of_device_id sunxi_mmc_of_match[] = {
	{ .compatible = "allwinner,sun4i-a10-mmc", },
	{ .compatible = "allwinner,sun5i-a13-mmc", },
	{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, sunxi_mmc_of_match);

static struct mmc_host_ops sunxi_mmc_ops = {
	.request	 = sunxi_mmc_request,
	.set_ios	 = sunxi_mmc_set_ios,
	.get_ro		 = mmc_gpio_get_ro,
	.get_cd		 = mmc_gpio_get_cd,
	.enable_sdio_irq = sunxi_mmc_enable_sdio_irq,
	.hw_reset	 = sunxi_mmc_hw_reset,
};

static int sunxi_mmc_resource_request(struct sunxi_mmc_host *host,
				      struct platform_device *pdev)
{
	struct device_node *np = pdev->dev.of_node;
	int ret;

	if (of_device_is_compatible(np, "allwinner,sun4i-a10-mmc"))
		host->idma_des_size_bits = 13;
	else
		host->idma_des_size_bits = 16;

	ret = mmc_regulator_get_supply(host->mmc);
	if (ret) {
		if (ret != -EPROBE_DEFER)
			dev_err(&pdev->dev, "Could not get vmmc supply\n");
		return ret;
	}

	host->reg_base = devm_ioremap_resource(&pdev->dev,
			      platform_get_resource(pdev, IORESOURCE_MEM, 0));
	if (IS_ERR(host->reg_base))
		return PTR_ERR(host->reg_base);

	host->clk_ahb = devm_clk_get(&pdev->dev, "ahb");
	if (IS_ERR(host->clk_ahb)) {
		dev_err(&pdev->dev, "Could not get ahb clock\n");
		return PTR_ERR(host->clk_ahb);
	}

	host->clk_mmc = devm_clk_get(&pdev->dev, "mmc");
	if (IS_ERR(host->clk_mmc)) {
		dev_err(&pdev->dev, "Could not get mmc clock\n");
		return PTR_ERR(host->clk_mmc);
	}

	host->reset = devm_reset_control_get(&pdev->dev, "ahb");

	ret = clk_prepare_enable(host->clk_ahb);
	if (ret) {
		dev_err(&pdev->dev, "Enable ahb clk err %d\n", ret);
		return ret;
	}

	ret = clk_prepare_enable(host->clk_mmc);
	if (ret) {
		dev_err(&pdev->dev, "Enable mmc clk err %d\n", ret);
		goto error_disable_clk_ahb;
	}

	if (!IS_ERR(host->reset)) {
		ret = reset_control_deassert(host->reset);
		if (ret) {
			dev_err(&pdev->dev, "reset err %d\n", ret);
			goto error_disable_clk_mmc;
		}
	}

	/*
	 * Sometimes the controller asserts the irq on boot for some reason,
	 * make sure the controller is in a sane state before enabling irqs.
	 */
	ret = sunxi_mmc_reset_host(host);
	if (ret)
		goto error_assert_reset;

	host->irq = platform_get_irq(pdev, 0);
	return devm_request_threaded_irq(&pdev->dev, host->irq, sunxi_mmc_irq,
			sunxi_mmc_handle_manual_stop, 0, "sunxi-mmc", host);

error_assert_reset:
	if (!IS_ERR(host->reset))
		reset_control_assert(host->reset);
error_disable_clk_mmc:
	clk_disable_unprepare(host->clk_mmc);
error_disable_clk_ahb:
	clk_disable_unprepare(host->clk_ahb);
	return ret;
}

static int sunxi_mmc_probe(struct platform_device *pdev)
{
	struct sunxi_mmc_host *host;
	struct mmc_host *mmc;
	int ret;

	mmc = mmc_alloc_host(sizeof(struct sunxi_mmc_host), &pdev->dev);
	if (!mmc) {
		dev_err(&pdev->dev, "mmc alloc host failed\n");
		return -ENOMEM;
	}

	host = mmc_priv(mmc);
	host->mmc = mmc;
	spin_lock_init(&host->lock);

	ret = sunxi_mmc_resource_request(host, pdev);
	if (ret)
		goto error_free_host;

	host->sg_cpu = dma_alloc_coherent(&pdev->dev, PAGE_SIZE,
					  &host->sg_dma, GFP_KERNEL);
	if (!host->sg_cpu) {
		dev_err(&pdev->dev, "Failed to allocate DMA descriptor mem\n");
		ret = -ENOMEM;
		goto error_free_host;
	}

	mmc->ops		= &sunxi_mmc_ops;
	mmc->max_blk_count	= 8192;
	mmc->max_blk_size	= 4096;
	mmc->max_segs		= PAGE_SIZE / sizeof(struct sunxi_idma_des);
	mmc->max_seg_size	= (1 << host->idma_des_size_bits);
	mmc->max_req_size	= mmc->max_seg_size * mmc->max_segs;
	/* 400kHz ~ 50MHz */
	mmc->f_min		=   400000;
	mmc->f_max		= 50000000;
	mmc->caps	       |= MMC_CAP_MMC_HIGHSPEED | MMC_CAP_SD_HIGHSPEED;

	ret = mmc_of_parse(mmc);
	if (ret)
		goto error_free_dma;

	ret = mmc_add_host(mmc);
	if (ret)
		goto error_free_dma;

	dev_info(&pdev->dev, "base:0x%p irq:%u\n", host->reg_base, host->irq);
	platform_set_drvdata(pdev, mmc);
	return 0;

error_free_dma:
	dma_free_coherent(&pdev->dev, PAGE_SIZE, host->sg_cpu, host->sg_dma);
error_free_host:
	mmc_free_host(mmc);
	return ret;
}

static int sunxi_mmc_remove(struct platform_device *pdev)
{
	struct mmc_host	*mmc = platform_get_drvdata(pdev);
	struct sunxi_mmc_host *host = mmc_priv(mmc);

	mmc_remove_host(mmc);
	disable_irq(host->irq);
	sunxi_mmc_reset_host(host);

	if (!IS_ERR(host->reset))
		reset_control_assert(host->reset);

	clk_disable_unprepare(host->clk_mmc);
	clk_disable_unprepare(host->clk_ahb);

	dma_free_coherent(&pdev->dev, PAGE_SIZE, host->sg_cpu, host->sg_dma);
	mmc_free_host(mmc);

	return 0;
}

static struct platform_driver sunxi_mmc_driver = {
	.driver = {
		.name	= "sunxi-mmc",
		.owner	= THIS_MODULE,
		.of_match_table = of_match_ptr(sunxi_mmc_of_match),
	},
	.probe		= sunxi_mmc_probe,
	.remove		= sunxi_mmc_remove,
};
module_platform_driver(sunxi_mmc_driver);

MODULE_DESCRIPTION("Allwinner's SD/MMC Card Controller Driver");
MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("David Lanzend�rfer <david.lanzendoerfer@o2s.ch>");
MODULE_ALIAS("platform:sunxi-mmc");