aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/usb/renesas_usbhs/fifo.c
blob: a34430f55fb751001a216b60770de6c2adfb5b5f (plain) (blame)
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
/*
 * Renesas USB driver
 *
 * Copyright (C) 2011 Renesas Solutions Corp.
 * Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 *
 */
#include <linux/delay.h>
#include <linux/io.h>
#include <linux/scatterlist.h>
#include "./common.h"
#include "./pipe.h"

#define usbhsf_get_cfifo(p)	(&((p)->fifo_info.cfifo))
#define usbhsf_get_d0fifo(p)	(&((p)->fifo_info.d0fifo))
#define usbhsf_get_d1fifo(p)	(&((p)->fifo_info.d1fifo))

#define usbhsf_fifo_is_busy(f)	((f)->pipe) /* see usbhs_pipe_select_fifo */

/*
 *		packet initialize
 */
void usbhs_pkt_init(struct usbhs_pkt *pkt)
{
	pkt->dma = DMA_ADDR_INVALID;
	INIT_LIST_HEAD(&pkt->node);
}

/*
 *		packet control function
 */
static int usbhsf_null_handle(struct usbhs_pkt *pkt, int *is_done)
{
	struct usbhs_priv *priv = usbhs_pipe_to_priv(pkt->pipe);
	struct device *dev = usbhs_priv_to_dev(priv);

	dev_err(dev, "null handler\n");

	return -EINVAL;
}

static struct usbhs_pkt_handle usbhsf_null_handler = {
	.prepare = usbhsf_null_handle,
	.try_run = usbhsf_null_handle,
};

void usbhs_pkt_push(struct usbhs_pipe *pipe, struct usbhs_pkt *pkt,
		    struct usbhs_pkt_handle *handler,
		    void *buf, int len, int zero)
{
	struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
	struct device *dev = usbhs_priv_to_dev(priv);
	unsigned long flags;

	/********************  spin lock ********************/
	usbhs_lock(priv, flags);

	if (!handler) {
		dev_err(dev, "no handler function\n");
		handler = &usbhsf_null_handler;
	}

	list_del_init(&pkt->node);
	list_add_tail(&pkt->node, &pipe->list);

	pkt->pipe	= pipe;
	pkt->buf	= buf;
	pkt->handler	= handler;
	pkt->length	= len;
	pkt->zero	= zero;
	pkt->actual	= 0;

	usbhs_unlock(priv, flags);
	/********************  spin unlock ******************/

	usbhs_pkt_start(pipe);
}

static void __usbhsf_pkt_del(struct usbhs_pkt *pkt)
{
	list_del_init(&pkt->node);
}

static struct usbhs_pkt *__usbhsf_pkt_get(struct usbhs_pipe *pipe)
{
	if (list_empty(&pipe->list))
		return NULL;

	return list_entry(pipe->list.next, struct usbhs_pkt, node);
}

struct usbhs_pkt *usbhs_pkt_pop(struct usbhs_pipe *pipe, struct usbhs_pkt *pkt)
{
	struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
	unsigned long flags;

	/********************  spin lock ********************/
	usbhs_lock(priv, flags);

	if (!pkt)
		pkt = __usbhsf_pkt_get(pipe);

	if (pkt)
		__usbhsf_pkt_del(pkt);

	usbhs_unlock(priv, flags);
	/********************  spin unlock ******************/

	return pkt;
}

int __usbhs_pkt_handler(struct usbhs_pipe *pipe, int type)
{
	struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
	struct usbhs_pipe_info *info = usbhs_priv_to_pipeinfo(priv);
	struct usbhs_pkt *pkt;
	struct device *dev = usbhs_priv_to_dev(priv);
	int (*func)(struct usbhs_pkt *pkt, int *is_done);
	unsigned long flags;
	int ret = 0;
	int is_done = 0;

	/********************  spin lock ********************/
	usbhs_lock(priv, flags);

	pkt = __usbhsf_pkt_get(pipe);
	if (!pkt)
		goto __usbhs_pkt_handler_end;

	switch (type) {
	case USBHSF_PKT_PREPARE:
		func = pkt->handler->prepare;
		break;
	case USBHSF_PKT_TRY_RUN:
		func = pkt->handler->try_run;
		break;
	case USBHSF_PKT_DMA_DONE:
		func = pkt->handler->dma_done;
		break;
	default:
		dev_err(dev, "unknown pkt hander\n");
		goto __usbhs_pkt_handler_end;
	}

	ret = func(pkt, &is_done);

	if (is_done)
		__usbhsf_pkt_del(pkt);

__usbhs_pkt_handler_end:
	usbhs_unlock(priv, flags);
	/********************  spin unlock ******************/

	if (is_done) {
		info->done(pkt);
		usbhs_pkt_start(pipe);
	}

	return ret;
}

/*
 *		irq enable/disable function
 */
#define usbhsf_irq_empty_ctrl(p, e) usbhsf_irq_callback_ctrl(p, bempsts, e)
#define usbhsf_irq_ready_ctrl(p, e) usbhsf_irq_callback_ctrl(p, brdysts, e)
#define usbhsf_irq_callback_ctrl(pipe, status, enable)			\
	({								\
		struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);	\
		struct usbhs_mod *mod = usbhs_mod_get_current(priv);	\
		u16 status = (1 << usbhs_pipe_number(pipe));		\
		if (!mod)						\
			return;						\
		if (enable)						\
			mod->irq_##status |= status;			\
		else							\
			mod->irq_##status &= ~status;			\
		usbhs_irq_callback_update(priv, mod);			\
	})

static void usbhsf_tx_irq_ctrl(struct usbhs_pipe *pipe, int enable)
{
	/*
	 * And DCP pipe can NOT use "ready interrupt" for "send"
	 * it should use "empty" interrupt.
	 * see
	 *   "Operation" - "Interrupt Function" - "BRDY Interrupt"
	 *
	 * on the other hand, normal pipe can use "ready interrupt" for "send"
	 * even though it is single/double buffer
	 */
	if (usbhs_pipe_is_dcp(pipe))
		usbhsf_irq_empty_ctrl(pipe, enable);
	else
		usbhsf_irq_ready_ctrl(pipe, enable);
}

static void usbhsf_rx_irq_ctrl(struct usbhs_pipe *pipe, int enable)
{
	usbhsf_irq_ready_ctrl(pipe, enable);
}

/*
 *		FIFO ctrl
 */
static void usbhsf_send_terminator(struct usbhs_pipe *pipe,
				   struct usbhs_fifo *fifo)
{
	struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);

	usbhs_bset(priv, fifo->ctr, BVAL, BVAL);
}

static int usbhsf_fifo_barrier(struct usbhs_priv *priv,
			       struct usbhs_fifo *fifo)
{
	int timeout = 1024;

	do {
		/* The FIFO port is accessible */
		if (usbhs_read(priv, fifo->ctr) & FRDY)
			return 0;

		udelay(10);
	} while (timeout--);

	return -EBUSY;
}

static void usbhsf_fifo_clear(struct usbhs_pipe *pipe,
			      struct usbhs_fifo *fifo)
{
	struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);

	if (!usbhs_pipe_is_dcp(pipe))
		usbhsf_fifo_barrier(priv, fifo);

	usbhs_write(priv, fifo->ctr, BCLR);
}

static int usbhsf_fifo_rcv_len(struct usbhs_priv *priv,
			       struct usbhs_fifo *fifo)
{
	return usbhs_read(priv, fifo->ctr) & DTLN_MASK;
}

static void usbhsf_fifo_unselect(struct usbhs_pipe *pipe,
				 struct usbhs_fifo *fifo)
{
	struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);

	usbhs_pipe_select_fifo(pipe, NULL);
	usbhs_write(priv, fifo->sel, 0);
}

static int usbhsf_fifo_select(struct usbhs_pipe *pipe,
			      struct usbhs_fifo *fifo,
			      int write)
{
	struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
	struct device *dev = usbhs_priv_to_dev(priv);
	int timeout = 1024;
	u16 mask = ((1 << 5) | 0xF);		/* mask of ISEL | CURPIPE */
	u16 base = usbhs_pipe_number(pipe);	/* CURPIPE */

	if (usbhs_pipe_is_busy(pipe) ||
	    usbhsf_fifo_is_busy(fifo))
		return -EBUSY;

	if (usbhs_pipe_is_dcp(pipe))
		base |= (1 == write) << 5;	/* ISEL */

	/* "base" will be used below  */
	usbhs_write(priv, fifo->sel, base | MBW_32);

	/* check ISEL and CURPIPE value */
	while (timeout--) {
		if (base == (mask & usbhs_read(priv, fifo->sel))) {
			usbhs_pipe_select_fifo(pipe, fifo);
			return 0;
		}
		udelay(10);
	}

	dev_err(dev, "fifo select error\n");

	return -EIO;
}

/*
 *		PIO push handler
 */
static int usbhsf_pio_try_push(struct usbhs_pkt *pkt, int *is_done)
{
	struct usbhs_pipe *pipe = pkt->pipe;
	struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
	struct device *dev = usbhs_priv_to_dev(priv);
	struct usbhs_fifo *fifo = usbhsf_get_cfifo(priv); /* CFIFO */
	void __iomem *addr = priv->base + fifo->port;
	u8 *buf;
	int maxp = usbhs_pipe_get_maxpacket(pipe);
	int total_len;
	int i, ret, len;
	int is_short;

	ret = usbhsf_fifo_select(pipe, fifo, 1);
	if (ret < 0)
		return 0;

	ret = usbhs_pipe_is_accessible(pipe);
	if (ret < 0) {
		/* inaccessible pipe is not an error */
		ret = 0;
		goto usbhs_fifo_write_busy;
	}

	ret = usbhsf_fifo_barrier(priv, fifo);
	if (ret < 0)
		goto usbhs_fifo_write_busy;

	buf		= pkt->buf    + pkt->actual;
	len		= pkt->length - pkt->actual;
	len		= min(len, maxp);
	total_len	= len;
	is_short	= total_len < maxp;

	/*
	 * FIXME
	 *
	 * 32-bit access only
	 */
	if (len >= 4 && !((unsigned long)buf & 0x03)) {
		iowrite32_rep(addr, buf, len / 4);
		len %= 4;
		buf += total_len - len;
	}

	/* the rest operation */
	for (i = 0; i < len; i++)
		iowrite8(buf[i], addr + (0x03 - (i & 0x03)));

	/*
	 * variable update
	 */
	pkt->actual += total_len;

	if (pkt->actual < pkt->length)
		*is_done = 0;		/* there are remainder data */
	else if (is_short)
		*is_done = 1;		/* short packet */
	else
		*is_done = !pkt->zero;	/* send zero packet ? */

	/*
	 * pipe/irq handling
	 */
	if (is_short)
		usbhsf_send_terminator(pipe, fifo);

	usbhsf_tx_irq_ctrl(pipe, !*is_done);
	usbhs_pipe_enable(pipe);

	dev_dbg(dev, "  send %d (%d/ %d/ %d/ %d)\n",
		usbhs_pipe_number(pipe),
		pkt->length, pkt->actual, *is_done, pkt->zero);

	/*
	 * Transmission end
	 */
	if (*is_done) {
		if (usbhs_pipe_is_dcp(pipe))
			usbhs_dcp_control_transfer_done(pipe);
	}

	usbhsf_fifo_unselect(pipe, fifo);

	return 0;

usbhs_fifo_write_busy:
	usbhsf_fifo_unselect(pipe, fifo);

	/*
	 * pipe is busy.
	 * retry in interrupt
	 */
	usbhsf_tx_irq_ctrl(pipe, 1);

	return ret;
}

struct usbhs_pkt_handle usbhs_fifo_pio_push_handler = {
	.prepare = usbhsf_pio_try_push,
	.try_run = usbhsf_pio_try_push,
};

/*
 *		PIO pop handler
 */
static int usbhsf_prepare_pop(struct usbhs_pkt *pkt, int *is_done)
{
	struct usbhs_pipe *pipe = pkt->pipe;

	if (usbhs_pipe_is_busy(pipe))
		return 0;

	/*
	 * pipe enable to prepare packet receive
	 */

	usbhs_pipe_enable(pipe);
	usbhsf_rx_irq_ctrl(pipe, 1);

	return 0;
}

static int usbhsf_pio_try_pop(struct usbhs_pkt *pkt, int *is_done)
{
	struct usbhs_pipe *pipe = pkt->pipe;
	struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
	struct device *dev = usbhs_priv_to_dev(priv);
	struct usbhs_fifo *fifo = usbhsf_get_cfifo(priv); /* CFIFO */
	void __iomem *addr = priv->base + fifo->port;
	u8 *buf;
	u32 data = 0;
	int maxp = usbhs_pipe_get_maxpacket(pipe);
	int rcv_len, len;
	int i, ret;
	int total_len = 0;

	ret = usbhsf_fifo_select(pipe, fifo, 0);
	if (ret < 0)
		return 0;

	ret = usbhsf_fifo_barrier(priv, fifo);
	if (ret < 0)
		goto usbhs_fifo_read_busy;

	rcv_len = usbhsf_fifo_rcv_len(priv, fifo);

	buf		= pkt->buf    + pkt->actual;
	len		= pkt->length - pkt->actual;
	len		= min(len, rcv_len);
	total_len	= len;

	/*
	 * Buffer clear if Zero-Length packet
	 *
	 * see
	 * "Operation" - "FIFO Buffer Memory" - "FIFO Port Function"
	 */
	if (0 == rcv_len) {
		usbhsf_fifo_clear(pipe, fifo);
		goto usbhs_fifo_read_end;
	}

	/*
	 * FIXME
	 *
	 * 32-bit access only
	 */
	if (len >= 4 && !((unsigned long)buf & 0x03)) {
		ioread32_rep(addr, buf, len / 4);
		len %= 4;
		buf += total_len - len;
	}

	/* the rest operation */
	for (i = 0; i < len; i++) {
		if (!(i & 0x03))
			data = ioread32(addr);

		buf[i] = (data >> ((i & 0x03) * 8)) & 0xff;
	}

	pkt->actual += total_len;

usbhs_fifo_read_end:
	if ((pkt->actual == pkt->length) ||	/* receive all data */
	    (total_len < maxp)) {		/* short packet */
		*is_done = 1;
		usbhsf_rx_irq_ctrl(pipe, 0);
		usbhs_pipe_disable(pipe);
	}

	dev_dbg(dev, "  recv %d (%d/ %d/ %d/ %d)\n",
		usbhs_pipe_number(pipe),
		pkt->length, pkt->actual, *is_done, pkt->zero);

usbhs_fifo_read_busy:
	usbhsf_fifo_unselect(pipe, fifo);

	return ret;
}

struct usbhs_pkt_handle usbhs_fifo_pio_pop_handler = {
	.prepare = usbhsf_prepare_pop,
	.try_run = usbhsf_pio_try_pop,
};

/*
 *		DCP ctrol statge handler
 */
static int usbhsf_ctrl_stage_end(struct usbhs_pkt *pkt, int *is_done)
{
	usbhs_dcp_control_transfer_done(pkt->pipe);

	*is_done = 1;

	return 0;
}

struct usbhs_pkt_handle usbhs_ctrl_stage_end_handler = {
	.prepare = usbhsf_ctrl_stage_end,
	.try_run = usbhsf_ctrl_stage_end,
};

/*
 *		DMA fifo functions
 */
static struct dma_chan *usbhsf_dma_chan_get(struct usbhs_fifo *fifo,
					    struct usbhs_pkt *pkt)
{
	if (&usbhs_fifo_dma_push_handler == pkt->handler)
		return fifo->tx_chan;

	if (&usbhs_fifo_dma_pop_handler == pkt->handler)
		return fifo->rx_chan;

	return NULL;
}

static struct usbhs_fifo *usbhsf_get_dma_fifo(struct usbhs_priv *priv,
					      struct usbhs_pkt *pkt)
{
	struct usbhs_fifo *fifo;

	/* DMA :: D0FIFO */
	fifo = usbhsf_get_d0fifo(priv);
	if (usbhsf_dma_chan_get(fifo, pkt) &&
	    !usbhsf_fifo_is_busy(fifo))
		return fifo;

	/* DMA :: D1FIFO */
	fifo = usbhsf_get_d1fifo(priv);
	if (usbhsf_dma_chan_get(fifo, pkt) &&
	    !usbhsf_fifo_is_busy(fifo))
		return fifo;

	return NULL;
}

#define usbhsf_dma_start(p, f)	__usbhsf_dma_ctrl(p, f, DREQE)
#define usbhsf_dma_stop(p, f)	__usbhsf_dma_ctrl(p, f, 0)
static void __usbhsf_dma_ctrl(struct usbhs_pipe *pipe,
			      struct usbhs_fifo *fifo,
			      u16 dreqe)
{
	struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);

	usbhs_bset(priv, fifo->sel, DREQE, dreqe);
}

#define usbhsf_dma_map(p)	__usbhsf_dma_map_ctrl(p, 1)
#define usbhsf_dma_unmap(p)	__usbhsf_dma_map_ctrl(p, 0)
static int __usbhsf_dma_map_ctrl(struct usbhs_pkt *pkt, int map)
{
	struct usbhs_pipe *pipe = pkt->pipe;
	struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
	struct usbhs_pipe_info *info = usbhs_priv_to_pipeinfo(priv);

	return info->dma_map_ctrl(pkt, map);
}

static void usbhsf_dma_complete(void *arg);
static void usbhsf_dma_prepare_tasklet(unsigned long data)
{
	struct usbhs_pkt *pkt = (struct usbhs_pkt *)data;
	struct usbhs_pipe *pipe = pkt->pipe;
	struct usbhs_fifo *fifo = usbhs_pipe_to_fifo(pipe);
	struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
	struct scatterlist sg;
	struct dma_async_tx_descriptor *desc;
	struct dma_chan *chan = usbhsf_dma_chan_get(fifo, pkt);
	struct device *dev = usbhs_priv_to_dev(priv);
	enum dma_data_direction dir;
	dma_cookie_t cookie;

	dir = usbhs_pipe_is_dir_in(pipe) ? DMA_FROM_DEVICE : DMA_TO_DEVICE;

	sg_init_table(&sg, 1);
	sg_set_page(&sg, virt_to_page(pkt->dma),
		    pkt->length, offset_in_page(pkt->dma));
	sg_dma_address(&sg) = pkt->dma + pkt->actual;
	sg_dma_len(&sg) = pkt->trans;

	desc = chan->device->device_prep_slave_sg(chan, &sg, 1, dir,
						  DMA_PREP_INTERRUPT |
						  DMA_CTRL_ACK);
	if (!desc)
		return;

	desc->callback		= usbhsf_dma_complete;
	desc->callback_param	= pipe;

	cookie = desc->tx_submit(desc);
	if (cookie < 0) {
		dev_err(dev, "Failed to submit dma descriptor\n");
		return;
	}

	dev_dbg(dev, "  %s %d (%d/ %d)\n",
		fifo->name, usbhs_pipe_number(pipe), pkt->length, pkt->zero);

	usbhsf_dma_start(pipe, fifo);
	dma_async_issue_pending(chan);
}

/*
 *		DMA push handler
 */
static int usbhsf_dma_prepare_push(struct usbhs_pkt *pkt, int *is_done)
{
	struct usbhs_pipe *pipe = pkt->pipe;
	struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
	struct usbhs_fifo *fifo;
	int len = pkt->length - pkt->actual;
	int ret;

	if (usbhs_pipe_is_busy(pipe))
		return 0;

	/* use PIO if packet is less than pio_dma_border or pipe is DCP */
	if ((len < usbhs_get_dparam(priv, pio_dma_border)) ||
	    usbhs_pipe_is_dcp(pipe))
		goto usbhsf_pio_prepare_push;

	if (len % 4) /* 32bit alignment */
		goto usbhsf_pio_prepare_push;

	if (((u32)pkt->buf + pkt->actual) & 0x7) /* 8byte alignment */
		goto usbhsf_pio_prepare_push;

	/* get enable DMA fifo */
	fifo = usbhsf_get_dma_fifo(priv, pkt);
	if (!fifo)
		goto usbhsf_pio_prepare_push;

	if (usbhsf_dma_map(pkt) < 0)
		goto usbhsf_pio_prepare_push;

	ret = usbhsf_fifo_select(pipe, fifo, 0);
	if (ret < 0)
		goto usbhsf_pio_prepare_push_unmap;

	pkt->trans = len;

	tasklet_init(&fifo->tasklet,
		     usbhsf_dma_prepare_tasklet,
		     (unsigned long)pkt);

	tasklet_schedule(&fifo->tasklet);

	return 0;

usbhsf_pio_prepare_push_unmap:
	usbhsf_dma_unmap(pkt);
usbhsf_pio_prepare_push:
	/*
	 * change handler to PIO
	 */
	pkt->handler = &usbhs_fifo_pio_push_handler;

	return pkt->handler->prepare(pkt, is_done);
}

static int usbhsf_dma_push_done(struct usbhs_pkt *pkt, int *is_done)
{
	struct usbhs_pipe *pipe = pkt->pipe;

	pkt->actual = pkt->trans;

	*is_done = !pkt->zero;	/* send zero packet ? */

	usbhsf_dma_stop(pipe, pipe->fifo);
	usbhsf_dma_unmap(pkt);
	usbhsf_fifo_unselect(pipe, pipe->fifo);

	return 0;
}

struct usbhs_pkt_handle usbhs_fifo_dma_push_handler = {
	.prepare	= usbhsf_dma_prepare_push,
	.dma_done	= usbhsf_dma_push_done,
};

/*
 *		DMA pop handler
 */
static int usbhsf_dma_try_pop(struct usbhs_pkt *pkt, int *is_done)
{
	struct usbhs_pipe *pipe = pkt->pipe;
	struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
	struct usbhs_fifo *fifo;
	int len, ret;

	if (usbhs_pipe_is_busy(pipe))
		return 0;

	if (usbhs_pipe_is_dcp(pipe))
		goto usbhsf_pio_prepare_pop;

	/* get enable DMA fifo */
	fifo = usbhsf_get_dma_fifo(priv, pkt);
	if (!fifo)
		goto usbhsf_pio_prepare_pop;

	if (((u32)pkt->buf + pkt->actual) & 0x7) /* 8byte alignment */
		goto usbhsf_pio_prepare_pop;

	ret = usbhsf_fifo_select(pipe, fifo, 0);
	if (ret < 0)
		goto usbhsf_pio_prepare_pop;

	/* use PIO if packet is less than pio_dma_border */
	len = usbhsf_fifo_rcv_len(priv, fifo);
	len = min(pkt->length - pkt->actual, len);
	if (len % 4) /* 32bit alignment */
		goto usbhsf_pio_prepare_pop_unselect;

	if (len < usbhs_get_dparam(priv, pio_dma_border))
		goto usbhsf_pio_prepare_pop_unselect;

	ret = usbhsf_fifo_barrier(priv, fifo);
	if (ret < 0)
		goto usbhsf_pio_prepare_pop_unselect;

	if (usbhsf_dma_map(pkt) < 0)
		goto usbhsf_pio_prepare_pop_unselect;

	/* DMA */

	/*
	 * usbhs_fifo_dma_pop_handler :: prepare
	 * enabled irq to come here.
	 * but it is no longer needed for DMA. disable it.
	 */
	usbhsf_rx_irq_ctrl(pipe, 0);

	pkt->trans = len;

	tasklet_init(&fifo->tasklet,
		     usbhsf_dma_prepare_tasklet,
		     (unsigned long)pkt);

	tasklet_schedule(&fifo->tasklet);

	return 0;

usbhsf_pio_prepare_pop_unselect:
	usbhsf_fifo_unselect(pipe, fifo);
usbhsf_pio_prepare_pop:

	/*
	 * change handler to PIO
	 */
	pkt->handler = &usbhs_fifo_pio_pop_handler;

	return pkt->handler->try_run(pkt, is_done);
}

static int usbhsf_dma_pop_done(struct usbhs_pkt *pkt, int *is_done)
{
	struct usbhs_pipe *pipe = pkt->pipe;
	int maxp = usbhs_pipe_get_maxpacket(pipe);

	usbhsf_dma_stop(pipe, pipe->fifo);
	usbhsf_dma_unmap(pkt);
	usbhsf_fifo_unselect(pipe, pipe->fifo);

	pkt->actual += pkt->trans;

	if ((pkt->actual == pkt->length) ||	/* receive all data */
	    (pkt->trans < maxp)) {		/* short packet */
		*is_done = 1;
	} else {
		/* re-enable */
		usbhsf_prepare_pop(pkt, is_done);
	}

	return 0;
}

struct usbhs_pkt_handle usbhs_fifo_dma_pop_handler = {
	.prepare	= usbhsf_prepare_pop,
	.try_run	= usbhsf_dma_try_pop,
	.dma_done	= usbhsf_dma_pop_done
};

/*
 *		DMA setting
 */
static bool usbhsf_dma_filter(struct dma_chan *chan, void *param)
{
	struct sh_dmae_slave *slave = param;

	/*
	 * FIXME
	 *
	 * usbhs doesn't recognize id = 0 as valid DMA
	 */
	if (0 == slave->slave_id)
		return false;

	chan->private = slave;

	return true;
}

static void usbhsf_dma_quit(struct usbhs_priv *priv, struct usbhs_fifo *fifo)
{
	if (fifo->tx_chan)
		dma_release_channel(fifo->tx_chan);
	if (fifo->rx_chan)
		dma_release_channel(fifo->rx_chan);

	fifo->tx_chan = NULL;
	fifo->rx_chan = NULL;
}

static void usbhsf_dma_init(struct usbhs_priv *priv,
			    struct usbhs_fifo *fifo)
{
	struct device *dev = usbhs_priv_to_dev(priv);
	dma_cap_mask_t mask;

	dma_cap_zero(mask);
	dma_cap_set(DMA_SLAVE, mask);
	fifo->tx_chan = dma_request_channel(mask, usbhsf_dma_filter,
					    &fifo->tx_slave);

	dma_cap_zero(mask);
	dma_cap_set(DMA_SLAVE, mask);
	fifo->rx_chan = dma_request_channel(mask, usbhsf_dma_filter,
					    &fifo->rx_slave);

	if (fifo->tx_chan || fifo->rx_chan)
		dev_dbg(dev, "enable DMAEngine (%s%s%s)\n",
			 fifo->name,
			 fifo->tx_chan ? "[TX]" : "    ",
			 fifo->rx_chan ? "[RX]" : "    ");
}

/*
 *		irq functions
 */
static int usbhsf_irq_empty(struct usbhs_priv *priv,
			    struct usbhs_irq_state *irq_state)
{
	struct usbhs_pipe *pipe;
	struct device *dev = usbhs_priv_to_dev(priv);
	int i, ret;

	if (!irq_state->bempsts) {
		dev_err(dev, "debug %s !!\n", __func__);
		return -EIO;
	}

	dev_dbg(dev, "irq empty [0x%04x]\n", irq_state->bempsts);

	/*
	 * search interrupted "pipe"
	 * not "uep".
	 */
	usbhs_for_each_pipe_with_dcp(pipe, priv, i) {
		if (!(irq_state->bempsts & (1 << i)))
			continue;

		ret = usbhs_pkt_run(pipe);
		if (ret < 0)
			dev_err(dev, "irq_empty run_error %d : %d\n", i, ret);
	}

	return 0;
}

static int usbhsf_irq_ready(struct usbhs_priv *priv,
			    struct usbhs_irq_state *irq_state)
{
	struct usbhs_pipe *pipe;
	struct device *dev = usbhs_priv_to_dev(priv);
	int i, ret;

	if (!irq_state->brdysts) {
		dev_err(dev, "debug %s !!\n", __func__);
		return -EIO;
	}

	dev_dbg(dev, "irq ready [0x%04x]\n", irq_state->brdysts);

	/*
	 * search interrupted "pipe"
	 * not "uep".
	 */
	usbhs_for_each_pipe_with_dcp(pipe, priv, i) {
		if (!(irq_state->brdysts & (1 << i)))
			continue;

		ret = usbhs_pkt_run(pipe);
		if (ret < 0)
			dev_err(dev, "irq_ready run_error %d : %d\n", i, ret);
	}

	return 0;
}

static void usbhsf_dma_complete(void *arg)
{
	struct usbhs_pipe *pipe = arg;
	struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
	struct device *dev = usbhs_priv_to_dev(priv);
	int ret;

	ret = usbhs_pkt_dmadone(pipe);
	if (ret < 0)
		dev_err(dev, "dma_complete run_error %d : %d\n",
			usbhs_pipe_number(pipe), ret);
}

/*
 *		fifo init
 */
void usbhs_fifo_init(struct usbhs_priv *priv)
{
	struct usbhs_mod *mod = usbhs_mod_get_current(priv);
	struct usbhs_fifo *cfifo = usbhsf_get_cfifo(priv);
	struct usbhs_fifo *d0fifo = usbhsf_get_d0fifo(priv);
	struct usbhs_fifo *d1fifo = usbhsf_get_d1fifo(priv);

	mod->irq_empty		= usbhsf_irq_empty;
	mod->irq_ready		= usbhsf_irq_ready;
	mod->irq_bempsts	= 0;
	mod->irq_brdysts	= 0;

	cfifo->pipe	= NULL;
	cfifo->tx_chan	= NULL;
	cfifo->rx_chan	= NULL;

	d0fifo->pipe	= NULL;
	d0fifo->tx_chan	= NULL;
	d0fifo->rx_chan	= NULL;

	d1fifo->pipe	= NULL;
	d1fifo->tx_chan	= NULL;
	d1fifo->rx_chan	= NULL;

	usbhsf_dma_init(priv, usbhsf_get_d0fifo(priv));
	usbhsf_dma_init(priv, usbhsf_get_d1fifo(priv));
}

void usbhs_fifo_quit(struct usbhs_priv *priv)
{
	struct usbhs_mod *mod = usbhs_mod_get_current(priv);

	mod->irq_empty		= NULL;
	mod->irq_ready		= NULL;
	mod->irq_bempsts	= 0;
	mod->irq_brdysts	= 0;

	usbhsf_dma_quit(priv, usbhsf_get_d0fifo(priv));
	usbhsf_dma_quit(priv, usbhsf_get_d1fifo(priv));
}

int usbhs_fifo_probe(struct usbhs_priv *priv)
{
	struct usbhs_fifo *fifo;

	/* CFIFO */
	fifo = usbhsf_get_cfifo(priv);
	fifo->name	= "CFIFO";
	fifo->port	= CFIFO;
	fifo->sel	= CFIFOSEL;
	fifo->ctr	= CFIFOCTR;

	/* D0FIFO */
	fifo = usbhsf_get_d0fifo(priv);
	fifo->name	= "D0FIFO";
	fifo->port	= D0FIFO;
	fifo->sel	= D0FIFOSEL;
	fifo->ctr	= D0FIFOCTR;
	fifo->tx_slave.slave_id	= usbhs_get_dparam(priv, d0_tx_id);
	fifo->rx_slave.slave_id	= usbhs_get_dparam(priv, d0_rx_id);

	/* D1FIFO */
	fifo = usbhsf_get_d1fifo(priv);
	fifo->name	= "D1FIFO";
	fifo->port	= D1FIFO;
	fifo->sel	= D1FIFOSEL;
	fifo->ctr	= D1FIFOCTR;
	fifo->tx_slave.slave_id	= usbhs_get_dparam(priv, d1_tx_id);
	fifo->rx_slave.slave_id	= usbhs_get_dparam(priv, d1_rx_id);

	return 0;
}

void usbhs_fifo_remove(struct usbhs_priv *priv)
{
}