aboutsummaryrefslogtreecommitdiffstats
path: root/target/linux/xburst/patches-3.10/015-MIPS-jz4740-Remove-custom-DMA-API.patch
blob: 0bce0ac8fa0c12aee27534e650036ecb1737e05f (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
From 7b91fca454e66ac1bc1fe5b68de0bf55f799bd41 Mon Sep 17 00:00:00 2001
From: Lars-Peter Clausen <lars@metafoo.de>
Date: Thu, 30 May 2013 18:25:05 +0200
Subject: [PATCH 15/16] MIPS: jz4740: Remove custom DMA API

Now that all users of the custom jz4740 DMA API have been converted to use
the dmaengine API instead we can remove the custom API and move all the code
talking to the hardware to the dmaengine driver.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Acked-by: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
---
 arch/mips/include/asm/mach-jz4740/dma.h |   56 ------
 arch/mips/jz4740/Makefile               |    2 +-
 arch/mips/jz4740/dma.c                  |  307 -------------------------------
 drivers/dma/dma-jz4740.c                |  258 ++++++++++++++++++++++----
 4 files changed, 222 insertions(+), 401 deletions(-)
 delete mode 100644 arch/mips/jz4740/dma.c

--- a/arch/mips/include/asm/mach-jz4740/dma.h
+++ b/arch/mips/include/asm/mach-jz4740/dma.h
@@ -16,8 +16,6 @@
 #ifndef __ASM_MACH_JZ4740_DMA_H__
 #define __ASM_MACH_JZ4740_DMA_H__
 
-struct jz4740_dma_chan;
-
 enum jz4740_dma_request_type {
 	JZ4740_DMA_TYPE_AUTO_REQUEST	= 8,
 	JZ4740_DMA_TYPE_UART_TRANSMIT	= 20,
@@ -33,58 +31,4 @@ enum jz4740_dma_request_type {
 	JZ4740_DMA_TYPE_SLCD		= 30,
 };
 
-enum jz4740_dma_width {
-	JZ4740_DMA_WIDTH_32BIT	= 0,
-	JZ4740_DMA_WIDTH_8BIT	= 1,
-	JZ4740_DMA_WIDTH_16BIT	= 2,
-};
-
-enum jz4740_dma_transfer_size {
-	JZ4740_DMA_TRANSFER_SIZE_4BYTE	= 0,
-	JZ4740_DMA_TRANSFER_SIZE_1BYTE	= 1,
-	JZ4740_DMA_TRANSFER_SIZE_2BYTE	= 2,
-	JZ4740_DMA_TRANSFER_SIZE_16BYTE = 3,
-	JZ4740_DMA_TRANSFER_SIZE_32BYTE = 4,
-};
-
-enum jz4740_dma_flags {
-	JZ4740_DMA_SRC_AUTOINC = 0x2,
-	JZ4740_DMA_DST_AUTOINC = 0x1,
-};
-
-enum jz4740_dma_mode {
-	JZ4740_DMA_MODE_SINGLE	= 0,
-	JZ4740_DMA_MODE_BLOCK	= 1,
-};
-
-struct jz4740_dma_config {
-	enum jz4740_dma_width src_width;
-	enum jz4740_dma_width dst_width;
-	enum jz4740_dma_transfer_size transfer_size;
-	enum jz4740_dma_request_type request_type;
-	enum jz4740_dma_flags flags;
-	enum jz4740_dma_mode mode;
-};
-
-typedef void (*jz4740_dma_complete_callback_t)(struct jz4740_dma_chan *, int, void *);
-
-struct jz4740_dma_chan *jz4740_dma_request(void *dev, const char *name);
-void jz4740_dma_free(struct jz4740_dma_chan *dma);
-
-void jz4740_dma_configure(struct jz4740_dma_chan *dma,
-	const struct jz4740_dma_config *config);
-
-
-void jz4740_dma_enable(struct jz4740_dma_chan *dma);
-void jz4740_dma_disable(struct jz4740_dma_chan *dma);
-
-void jz4740_dma_set_src_addr(struct jz4740_dma_chan *dma, dma_addr_t src);
-void jz4740_dma_set_dst_addr(struct jz4740_dma_chan *dma, dma_addr_t dst);
-void jz4740_dma_set_transfer_count(struct jz4740_dma_chan *dma, uint32_t count);
-
-uint32_t jz4740_dma_get_residue(const struct jz4740_dma_chan *dma);
-
-void jz4740_dma_set_complete_cb(struct jz4740_dma_chan *dma,
-	jz4740_dma_complete_callback_t cb);
-
 #endif	/* __ASM_JZ4740_DMA_H__ */
--- a/arch/mips/jz4740/Makefile
+++ b/arch/mips/jz4740/Makefile
@@ -4,7 +4,7 @@
 
 # Object file lists.
 
-obj-y += prom.o irq.o time.o reset.o setup.o dma.o \
+obj-y += prom.o irq.o time.o reset.o setup.o \
 	gpio.o clock.o platform.o timer.o serial.o
 
 obj-$(CONFIG_DEBUG_FS) += clock-debugfs.o
--- a/arch/mips/jz4740/dma.c
+++ /dev/null
@@ -1,307 +0,0 @@
-/*
- *  Copyright (C) 2010, Lars-Peter Clausen <lars@metafoo.de>
- *  JZ4740 SoC DMA support
- *
- *  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.
- *
- *  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.,
- *  675 Mass Ave, Cambridge, MA 02139, USA.
- *
- */
-
-#include <linux/kernel.h>
-#include <linux/module.h>
-#include <linux/spinlock.h>
-#include <linux/clk.h>
-#include <linux/interrupt.h>
-
-#include <linux/dma-mapping.h>
-#include <asm/mach-jz4740/dma.h>
-#include <asm/mach-jz4740/base.h>
-
-#define JZ_REG_DMA_SRC_ADDR(x)		(0x00 + (x) * 0x20)
-#define JZ_REG_DMA_DST_ADDR(x)		(0x04 + (x) * 0x20)
-#define JZ_REG_DMA_TRANSFER_COUNT(x)	(0x08 + (x) * 0x20)
-#define JZ_REG_DMA_REQ_TYPE(x)		(0x0C + (x) * 0x20)
-#define JZ_REG_DMA_STATUS_CTRL(x)	(0x10 + (x) * 0x20)
-#define JZ_REG_DMA_CMD(x)		(0x14 + (x) * 0x20)
-#define JZ_REG_DMA_DESC_ADDR(x)		(0x18 + (x) * 0x20)
-
-#define JZ_REG_DMA_CTRL			0x300
-#define JZ_REG_DMA_IRQ			0x304
-#define JZ_REG_DMA_DOORBELL		0x308
-#define JZ_REG_DMA_DOORBELL_SET		0x30C
-
-#define JZ_DMA_STATUS_CTRL_NO_DESC		BIT(31)
-#define JZ_DMA_STATUS_CTRL_DESC_INV		BIT(6)
-#define JZ_DMA_STATUS_CTRL_ADDR_ERR		BIT(4)
-#define JZ_DMA_STATUS_CTRL_TRANSFER_DONE	BIT(3)
-#define JZ_DMA_STATUS_CTRL_HALT			BIT(2)
-#define JZ_DMA_STATUS_CTRL_COUNT_TERMINATE	BIT(1)
-#define JZ_DMA_STATUS_CTRL_ENABLE		BIT(0)
-
-#define JZ_DMA_CMD_SRC_INC			BIT(23)
-#define JZ_DMA_CMD_DST_INC			BIT(22)
-#define JZ_DMA_CMD_RDIL_MASK			(0xf << 16)
-#define JZ_DMA_CMD_SRC_WIDTH_MASK		(0x3 << 14)
-#define JZ_DMA_CMD_DST_WIDTH_MASK		(0x3 << 12)
-#define JZ_DMA_CMD_INTERVAL_LENGTH_MASK		(0x7 << 8)
-#define JZ_DMA_CMD_BLOCK_MODE			BIT(7)
-#define JZ_DMA_CMD_DESC_VALID			BIT(4)
-#define JZ_DMA_CMD_DESC_VALID_MODE		BIT(3)
-#define JZ_DMA_CMD_VALID_IRQ_ENABLE		BIT(2)
-#define JZ_DMA_CMD_TRANSFER_IRQ_ENABLE		BIT(1)
-#define JZ_DMA_CMD_LINK_ENABLE			BIT(0)
-
-#define JZ_DMA_CMD_FLAGS_OFFSET 22
-#define JZ_DMA_CMD_RDIL_OFFSET 16
-#define JZ_DMA_CMD_SRC_WIDTH_OFFSET 14
-#define JZ_DMA_CMD_DST_WIDTH_OFFSET 12
-#define JZ_DMA_CMD_TRANSFER_SIZE_OFFSET 8
-#define JZ_DMA_CMD_MODE_OFFSET 7
-
-#define JZ_DMA_CTRL_PRIORITY_MASK	(0x3 << 8)
-#define JZ_DMA_CTRL_HALT		BIT(3)
-#define JZ_DMA_CTRL_ADDRESS_ERROR	BIT(2)
-#define JZ_DMA_CTRL_ENABLE		BIT(0)
-
-
-static void __iomem *jz4740_dma_base;
-static spinlock_t jz4740_dma_lock;
-
-static inline uint32_t jz4740_dma_read(size_t reg)
-{
-	return readl(jz4740_dma_base + reg);
-}
-
-static inline void jz4740_dma_write(size_t reg, uint32_t val)
-{
-	writel(val, jz4740_dma_base + reg);
-}
-
-static inline void jz4740_dma_write_mask(size_t reg, uint32_t val, uint32_t mask)
-{
-	uint32_t val2;
-	val2 = jz4740_dma_read(reg);
-	val2 &= ~mask;
-	val2 |= val;
-	jz4740_dma_write(reg, val2);
-}
-
-struct jz4740_dma_chan {
-	unsigned int id;
-	void *dev;
-	const char *name;
-
-	enum jz4740_dma_flags flags;
-	uint32_t transfer_shift;
-
-	jz4740_dma_complete_callback_t complete_cb;
-
-	unsigned used:1;
-};
-
-#define JZ4740_DMA_CHANNEL(_id) { .id = _id }
-
-struct jz4740_dma_chan jz4740_dma_channels[] = {
-	JZ4740_DMA_CHANNEL(0),
-	JZ4740_DMA_CHANNEL(1),
-	JZ4740_DMA_CHANNEL(2),
-	JZ4740_DMA_CHANNEL(3),
-	JZ4740_DMA_CHANNEL(4),
-	JZ4740_DMA_CHANNEL(5),
-};
-
-struct jz4740_dma_chan *jz4740_dma_request(void *dev, const char *name)
-{
-	unsigned int i;
-	struct jz4740_dma_chan *dma = NULL;
-
-	spin_lock(&jz4740_dma_lock);
-
-	for (i = 0; i < ARRAY_SIZE(jz4740_dma_channels); ++i) {
-		if (!jz4740_dma_channels[i].used) {
-			dma = &jz4740_dma_channels[i];
-			dma->used = 1;
-			break;
-		}
-	}
-
-	spin_unlock(&jz4740_dma_lock);
-
-	if (!dma)
-		return NULL;
-
-	dma->dev = dev;
-	dma->name = name;
-
-	return dma;
-}
-EXPORT_SYMBOL_GPL(jz4740_dma_request);
-
-void jz4740_dma_configure(struct jz4740_dma_chan *dma,
-	const struct jz4740_dma_config *config)
-{
-	uint32_t cmd;
-
-	switch (config->transfer_size) {
-	case JZ4740_DMA_TRANSFER_SIZE_2BYTE:
-		dma->transfer_shift = 1;
-		break;
-	case JZ4740_DMA_TRANSFER_SIZE_4BYTE:
-		dma->transfer_shift = 2;
-		break;
-	case JZ4740_DMA_TRANSFER_SIZE_16BYTE:
-		dma->transfer_shift = 4;
-		break;
-	case JZ4740_DMA_TRANSFER_SIZE_32BYTE:
-		dma->transfer_shift = 5;
-		break;
-	default:
-		dma->transfer_shift = 0;
-		break;
-	}
-
-	cmd = config->flags << JZ_DMA_CMD_FLAGS_OFFSET;
-	cmd |= config->src_width << JZ_DMA_CMD_SRC_WIDTH_OFFSET;
-	cmd |= config->dst_width << JZ_DMA_CMD_DST_WIDTH_OFFSET;
-	cmd |= config->transfer_size << JZ_DMA_CMD_TRANSFER_SIZE_OFFSET;
-	cmd |= config->mode << JZ_DMA_CMD_MODE_OFFSET;
-	cmd |= JZ_DMA_CMD_TRANSFER_IRQ_ENABLE;
-
-	jz4740_dma_write(JZ_REG_DMA_CMD(dma->id), cmd);
-	jz4740_dma_write(JZ_REG_DMA_STATUS_CTRL(dma->id), 0);
-	jz4740_dma_write(JZ_REG_DMA_REQ_TYPE(dma->id), config->request_type);
-}
-EXPORT_SYMBOL_GPL(jz4740_dma_configure);
-
-void jz4740_dma_set_src_addr(struct jz4740_dma_chan *dma, dma_addr_t src)
-{
-	jz4740_dma_write(JZ_REG_DMA_SRC_ADDR(dma->id), src);
-}
-EXPORT_SYMBOL_GPL(jz4740_dma_set_src_addr);
-
-void jz4740_dma_set_dst_addr(struct jz4740_dma_chan *dma, dma_addr_t dst)
-{
-	jz4740_dma_write(JZ_REG_DMA_DST_ADDR(dma->id), dst);
-}
-EXPORT_SYMBOL_GPL(jz4740_dma_set_dst_addr);
-
-void jz4740_dma_set_transfer_count(struct jz4740_dma_chan *dma, uint32_t count)
-{
-	count >>= dma->transfer_shift;
-	jz4740_dma_write(JZ_REG_DMA_TRANSFER_COUNT(dma->id), count);
-}
-EXPORT_SYMBOL_GPL(jz4740_dma_set_transfer_count);
-
-void jz4740_dma_set_complete_cb(struct jz4740_dma_chan *dma,
-	jz4740_dma_complete_callback_t cb)
-{
-	dma->complete_cb = cb;
-}
-EXPORT_SYMBOL_GPL(jz4740_dma_set_complete_cb);
-
-void jz4740_dma_free(struct jz4740_dma_chan *dma)
-{
-	dma->dev = NULL;
-	dma->complete_cb = NULL;
-	dma->used = 0;
-}
-EXPORT_SYMBOL_GPL(jz4740_dma_free);
-
-void jz4740_dma_enable(struct jz4740_dma_chan *dma)
-{
-	jz4740_dma_write_mask(JZ_REG_DMA_STATUS_CTRL(dma->id),
-			JZ_DMA_STATUS_CTRL_NO_DESC | JZ_DMA_STATUS_CTRL_ENABLE,
-			JZ_DMA_STATUS_CTRL_HALT | JZ_DMA_STATUS_CTRL_NO_DESC |
-			JZ_DMA_STATUS_CTRL_ENABLE);
-
-	jz4740_dma_write_mask(JZ_REG_DMA_CTRL,
-			JZ_DMA_CTRL_ENABLE,
-			JZ_DMA_CTRL_HALT | JZ_DMA_CTRL_ENABLE);
-}
-EXPORT_SYMBOL_GPL(jz4740_dma_enable);
-
-void jz4740_dma_disable(struct jz4740_dma_chan *dma)
-{
-	jz4740_dma_write_mask(JZ_REG_DMA_STATUS_CTRL(dma->id), 0,
-			JZ_DMA_STATUS_CTRL_ENABLE);
-}
-EXPORT_SYMBOL_GPL(jz4740_dma_disable);
-
-uint32_t jz4740_dma_get_residue(const struct jz4740_dma_chan *dma)
-{
-	uint32_t residue;
-	residue = jz4740_dma_read(JZ_REG_DMA_TRANSFER_COUNT(dma->id));
-	return residue << dma->transfer_shift;
-}
-EXPORT_SYMBOL_GPL(jz4740_dma_get_residue);
-
-static void jz4740_dma_chan_irq(struct jz4740_dma_chan *dma)
-{
-	(void) jz4740_dma_read(JZ_REG_DMA_STATUS_CTRL(dma->id));
-
-	jz4740_dma_write_mask(JZ_REG_DMA_STATUS_CTRL(dma->id), 0,
-		JZ_DMA_STATUS_CTRL_ENABLE | JZ_DMA_STATUS_CTRL_TRANSFER_DONE);
-
-	if (dma->complete_cb)
-		dma->complete_cb(dma, 0, dma->dev);
-}
-
-static irqreturn_t jz4740_dma_irq(int irq, void *dev_id)
-{
-	uint32_t irq_status;
-	unsigned int i;
-
-	irq_status = readl(jz4740_dma_base + JZ_REG_DMA_IRQ);
-
-	for (i = 0; i < 6; ++i) {
-		if (irq_status & (1 << i))
-			jz4740_dma_chan_irq(&jz4740_dma_channels[i]);
-	}
-
-	return IRQ_HANDLED;
-}
-
-static int jz4740_dma_init(void)
-{
-	struct clk *clk;
-	unsigned int ret;
-
-	jz4740_dma_base = ioremap(JZ4740_DMAC_BASE_ADDR, 0x400);
-
-	if (!jz4740_dma_base)
-		return -EBUSY;
-
-	spin_lock_init(&jz4740_dma_lock);
-
-	clk = clk_get(NULL, "dma");
-	if (IS_ERR(clk)) {
-		ret = PTR_ERR(clk);
-		printk(KERN_ERR "JZ4740 DMA: Failed to request clock: %d\n",
-				ret);
-		goto err_iounmap;
-	}
-
-	ret = request_irq(JZ4740_IRQ_DMAC, jz4740_dma_irq, 0, "DMA", NULL);
-	if (ret) {
-		printk(KERN_ERR "JZ4740 DMA: Failed to request irq: %d\n", ret);
-		goto err_clkput;
-	}
-
-	clk_enable(clk);
-
-	return 0;
-
-err_clkput:
-	clk_put(clk);
-
-err_iounmap:
-	iounmap(jz4740_dma_base);
-	return ret;
-}
-arch_initcall(jz4740_dma_init);
--- a/drivers/dma/dma-jz4740.c
+++ b/drivers/dma/dma-jz4740.c
@@ -22,6 +22,8 @@
 #include <linux/platform_device.h>
 #include <linux/slab.h>
 #include <linux/spinlock.h>
+#include <linux/irq.h>
+#include <linux/clk.h>
 
 #include <asm/mach-jz4740/dma.h>
 
@@ -29,6 +31,76 @@
 
 #define JZ_DMA_NR_CHANS 6
 
+#define JZ_REG_DMA_SRC_ADDR(x)		(0x00 + (x) * 0x20)
+#define JZ_REG_DMA_DST_ADDR(x)		(0x04 + (x) * 0x20)
+#define JZ_REG_DMA_TRANSFER_COUNT(x)	(0x08 + (x) * 0x20)
+#define JZ_REG_DMA_REQ_TYPE(x)		(0x0C + (x) * 0x20)
+#define JZ_REG_DMA_STATUS_CTRL(x)	(0x10 + (x) * 0x20)
+#define JZ_REG_DMA_CMD(x)		(0x14 + (x) * 0x20)
+#define JZ_REG_DMA_DESC_ADDR(x)		(0x18 + (x) * 0x20)
+
+#define JZ_REG_DMA_CTRL			0x300
+#define JZ_REG_DMA_IRQ			0x304
+#define JZ_REG_DMA_DOORBELL		0x308
+#define JZ_REG_DMA_DOORBELL_SET		0x30C
+
+#define JZ_DMA_STATUS_CTRL_NO_DESC		BIT(31)
+#define JZ_DMA_STATUS_CTRL_DESC_INV		BIT(6)
+#define JZ_DMA_STATUS_CTRL_ADDR_ERR		BIT(4)
+#define JZ_DMA_STATUS_CTRL_TRANSFER_DONE	BIT(3)
+#define JZ_DMA_STATUS_CTRL_HALT			BIT(2)
+#define JZ_DMA_STATUS_CTRL_COUNT_TERMINATE	BIT(1)
+#define JZ_DMA_STATUS_CTRL_ENABLE		BIT(0)
+
+#define JZ_DMA_CMD_SRC_INC			BIT(23)
+#define JZ_DMA_CMD_DST_INC			BIT(22)
+#define JZ_DMA_CMD_RDIL_MASK			(0xf << 16)
+#define JZ_DMA_CMD_SRC_WIDTH_MASK		(0x3 << 14)
+#define JZ_DMA_CMD_DST_WIDTH_MASK		(0x3 << 12)
+#define JZ_DMA_CMD_INTERVAL_LENGTH_MASK		(0x7 << 8)
+#define JZ_DMA_CMD_BLOCK_MODE			BIT(7)
+#define JZ_DMA_CMD_DESC_VALID			BIT(4)
+#define JZ_DMA_CMD_DESC_VALID_MODE		BIT(3)
+#define JZ_DMA_CMD_VALID_IRQ_ENABLE		BIT(2)
+#define JZ_DMA_CMD_TRANSFER_IRQ_ENABLE		BIT(1)
+#define JZ_DMA_CMD_LINK_ENABLE			BIT(0)
+
+#define JZ_DMA_CMD_FLAGS_OFFSET 22
+#define JZ_DMA_CMD_RDIL_OFFSET 16
+#define JZ_DMA_CMD_SRC_WIDTH_OFFSET 14
+#define JZ_DMA_CMD_DST_WIDTH_OFFSET 12
+#define JZ_DMA_CMD_TRANSFER_SIZE_OFFSET 8
+#define JZ_DMA_CMD_MODE_OFFSET 7
+
+#define JZ_DMA_CTRL_PRIORITY_MASK		(0x3 << 8)
+#define JZ_DMA_CTRL_HALT			BIT(3)
+#define JZ_DMA_CTRL_ADDRESS_ERROR		BIT(2)
+#define JZ_DMA_CTRL_ENABLE			BIT(0)
+
+enum jz4740_dma_width {
+	JZ4740_DMA_WIDTH_32BIT	= 0,
+	JZ4740_DMA_WIDTH_8BIT	= 1,
+	JZ4740_DMA_WIDTH_16BIT	= 2,
+};
+
+enum jz4740_dma_transfer_size {
+	JZ4740_DMA_TRANSFER_SIZE_4BYTE	= 0,
+	JZ4740_DMA_TRANSFER_SIZE_1BYTE	= 1,
+	JZ4740_DMA_TRANSFER_SIZE_2BYTE	= 2,
+	JZ4740_DMA_TRANSFER_SIZE_16BYTE = 3,
+	JZ4740_DMA_TRANSFER_SIZE_32BYTE = 4,
+};
+
+enum jz4740_dma_flags {
+	JZ4740_DMA_SRC_AUTOINC = 0x2,
+	JZ4740_DMA_DST_AUTOINC = 0x1,
+};
+
+enum jz4740_dma_mode {
+	JZ4740_DMA_MODE_SINGLE	= 0,
+	JZ4740_DMA_MODE_BLOCK	= 1,
+};
+
 struct jz4740_dma_sg {
 	dma_addr_t addr;
 	unsigned int len;
@@ -46,9 +118,10 @@ struct jz4740_dma_desc {
 
 struct jz4740_dmaengine_chan {
 	struct virt_dma_chan vchan;
-	struct jz4740_dma_chan *jz_chan;
+	unsigned int id;
 
 	dma_addr_t fifo_addr;
+	unsigned int transfer_shift;
 
 	struct jz4740_dma_desc *desc;
 	unsigned int next_sg;
@@ -56,10 +129,19 @@ struct jz4740_dmaengine_chan {
 
 struct jz4740_dma_dev {
 	struct dma_device ddev;
+	void __iomem *base;
+	struct clk *clk;
 
 	struct jz4740_dmaengine_chan chan[JZ_DMA_NR_CHANS];
 };
 
+static struct jz4740_dma_dev *jz4740_dma_chan_get_dev(
+	struct jz4740_dmaengine_chan *chan)
+{
+	return container_of(chan->vchan.chan.device, struct jz4740_dma_dev,
+		ddev);
+}
+
 static struct jz4740_dmaengine_chan *to_jz4740_dma_chan(struct dma_chan *c)
 {
 	return container_of(c, struct jz4740_dmaengine_chan, vchan.chan);
@@ -70,6 +152,29 @@ static struct jz4740_dma_desc *to_jz4740
 	return container_of(vdesc, struct jz4740_dma_desc, vdesc);
 }
 
+static inline uint32_t jz4740_dma_read(struct jz4740_dma_dev *dmadev,
+	unsigned int reg)
+{
+	return readl(dmadev->base + reg);
+}
+
+static inline void jz4740_dma_write(struct jz4740_dma_dev *dmadev,
+	unsigned reg, uint32_t val)
+{
+	writel(val, dmadev->base + reg);
+}
+
+static inline void jz4740_dma_write_mask(struct jz4740_dma_dev *dmadev,
+	unsigned int reg, uint32_t val, uint32_t mask)
+{
+	uint32_t tmp;
+
+	tmp = jz4740_dma_read(dmadev, reg);
+	tmp &= ~mask;
+	tmp |= val;
+	jz4740_dma_write(dmadev, reg, tmp);
+}
+
 static struct jz4740_dma_desc *jz4740_dma_alloc_desc(unsigned int num_sgs)
 {
 	return kzalloc(sizeof(struct jz4740_dma_desc) +
@@ -108,30 +213,60 @@ static int jz4740_dma_slave_config(struc
 	const struct dma_slave_config *config)
 {
 	struct jz4740_dmaengine_chan *chan = to_jz4740_dma_chan(c);
-	struct jz4740_dma_config jzcfg;
+	struct jz4740_dma_dev *dmadev = jz4740_dma_chan_get_dev(chan);
+	enum jz4740_dma_width src_width;
+	enum jz4740_dma_width dst_width;
+	enum jz4740_dma_transfer_size transfer_size;
+	enum jz4740_dma_flags flags;
+	uint32_t cmd;
 
 	switch (config->direction) {
 	case DMA_MEM_TO_DEV:
-		jzcfg.flags = JZ4740_DMA_SRC_AUTOINC;
-		jzcfg.transfer_size = jz4740_dma_maxburst(config->dst_maxburst);
+		flags = JZ4740_DMA_SRC_AUTOINC;
+		transfer_size = jz4740_dma_maxburst(config->dst_maxburst);
 		chan->fifo_addr = config->dst_addr;
 		break;
 	case DMA_DEV_TO_MEM:
-		jzcfg.flags = JZ4740_DMA_DST_AUTOINC;
-		jzcfg.transfer_size = jz4740_dma_maxburst(config->src_maxburst);
+		flags = JZ4740_DMA_DST_AUTOINC;
+		transfer_size = jz4740_dma_maxburst(config->src_maxburst);
 		chan->fifo_addr = config->src_addr;
 		break;
 	default:
 		return -EINVAL;
 	}
 
+	src_width = jz4740_dma_width(config->src_addr_width);
+	dst_width = jz4740_dma_width(config->dst_addr_width);
 
-	jzcfg.src_width = jz4740_dma_width(config->src_addr_width);
-	jzcfg.dst_width = jz4740_dma_width(config->dst_addr_width);
-	jzcfg.mode = JZ4740_DMA_MODE_SINGLE;
-	jzcfg.request_type = config->slave_id;
+	switch (transfer_size) {
+	case JZ4740_DMA_TRANSFER_SIZE_2BYTE:
+		chan->transfer_shift = 1;
+		break;
+	case JZ4740_DMA_TRANSFER_SIZE_4BYTE:
+		chan->transfer_shift = 2;
+		break;
+	case JZ4740_DMA_TRANSFER_SIZE_16BYTE:
+		chan->transfer_shift = 4;
+		break;
+	case JZ4740_DMA_TRANSFER_SIZE_32BYTE:
+		chan->transfer_shift = 5;
+		break;
+	default:
+		chan->transfer_shift = 0;
+		break;
+	}
 
-	jz4740_dma_configure(chan->jz_chan, &jzcfg);
+	cmd = flags << JZ_DMA_CMD_FLAGS_OFFSET;
+	cmd |= src_width << JZ_DMA_CMD_SRC_WIDTH_OFFSET;
+	cmd |= dst_width << JZ_DMA_CMD_DST_WIDTH_OFFSET;
+	cmd |= transfer_size << JZ_DMA_CMD_TRANSFER_SIZE_OFFSET;
+	cmd |= JZ4740_DMA_MODE_SINGLE << JZ_DMA_CMD_MODE_OFFSET;
+	cmd |= JZ_DMA_CMD_TRANSFER_IRQ_ENABLE;
+
+	jz4740_dma_write(dmadev, JZ_REG_DMA_CMD(chan->id), cmd);
+	jz4740_dma_write(dmadev, JZ_REG_DMA_STATUS_CTRL(chan->id), 0);
+	jz4740_dma_write(dmadev, JZ_REG_DMA_REQ_TYPE(chan->id),
+		config->slave_id);
 
 	return 0;
 }
@@ -139,11 +274,13 @@ static int jz4740_dma_slave_config(struc
 static int jz4740_dma_terminate_all(struct dma_chan *c)
 {
 	struct jz4740_dmaengine_chan *chan = to_jz4740_dma_chan(c);
+	struct jz4740_dma_dev *dmadev = jz4740_dma_chan_get_dev(chan);
 	unsigned long flags;
 	LIST_HEAD(head);
 
 	spin_lock_irqsave(&chan->vchan.lock, flags);
-	jz4740_dma_disable(chan->jz_chan);
+	jz4740_dma_write_mask(dmadev, JZ_REG_DMA_STATUS_CTRL(chan->id), 0,
+			JZ_DMA_STATUS_CTRL_ENABLE);
 	chan->desc = NULL;
 	vchan_get_all_descriptors(&chan->vchan, &head);
 	spin_unlock_irqrestore(&chan->vchan.lock, flags);
@@ -170,11 +307,13 @@ static int jz4740_dma_control(struct dma
 
 static int jz4740_dma_start_transfer(struct jz4740_dmaengine_chan *chan)
 {
+	struct jz4740_dma_dev *dmadev = jz4740_dma_chan_get_dev(chan);
 	dma_addr_t src_addr, dst_addr;
 	struct virt_dma_desc *vdesc;
 	struct jz4740_dma_sg *sg;
 
-	jz4740_dma_disable(chan->jz_chan);
+	jz4740_dma_write_mask(dmadev, JZ_REG_DMA_STATUS_CTRL(chan->id), 0,
+			JZ_DMA_STATUS_CTRL_ENABLE);
 
 	if (!chan->desc) {
 		vdesc = vchan_next_desc(&chan->vchan);
@@ -196,22 +335,27 @@ static int jz4740_dma_start_transfer(str
 		src_addr = chan->fifo_addr;
 		dst_addr = sg->addr;
 	}
-	jz4740_dma_set_src_addr(chan->jz_chan, src_addr);
-	jz4740_dma_set_dst_addr(chan->jz_chan, dst_addr);
-	jz4740_dma_set_transfer_count(chan->jz_chan, sg->len);
+	jz4740_dma_write(dmadev, JZ_REG_DMA_SRC_ADDR(chan->id), src_addr);
+	jz4740_dma_write(dmadev, JZ_REG_DMA_DST_ADDR(chan->id), dst_addr);
+	jz4740_dma_write(dmadev, JZ_REG_DMA_TRANSFER_COUNT(chan->id),
+			sg->len >> chan->transfer_shift);
 
 	chan->next_sg++;
 
-	jz4740_dma_enable(chan->jz_chan);
+	jz4740_dma_write_mask(dmadev, JZ_REG_DMA_STATUS_CTRL(chan->id),
+			JZ_DMA_STATUS_CTRL_NO_DESC | JZ_DMA_STATUS_CTRL_ENABLE,
+			JZ_DMA_STATUS_CTRL_HALT | JZ_DMA_STATUS_CTRL_NO_DESC |
+			JZ_DMA_STATUS_CTRL_ENABLE);
+
+	jz4740_dma_write_mask(dmadev, JZ_REG_DMA_CTRL,
+			JZ_DMA_CTRL_ENABLE,
+			JZ_DMA_CTRL_HALT | JZ_DMA_CTRL_ENABLE);
 
 	return 0;
 }
 
-static void jz4740_dma_complete_cb(struct jz4740_dma_chan *jz_chan, int error,
-	void *devid)
+static void jz4740_dma_chan_irq(struct jz4740_dmaengine_chan *chan)
 {
-	struct jz4740_dmaengine_chan *chan = devid;
-
 	spin_lock(&chan->vchan.lock);
 	if (chan->desc) {
 		if (chan->desc && chan->desc->cyclic) {
@@ -227,6 +371,28 @@ static void jz4740_dma_complete_cb(struc
 	spin_unlock(&chan->vchan.lock);
 }
 
+static irqreturn_t jz4740_dma_irq(int irq, void *devid)
+{
+	struct jz4740_dma_dev *dmadev = devid;
+	uint32_t irq_status;
+	unsigned int i;
+
+	irq_status = readl(dmadev->base + JZ_REG_DMA_IRQ);
+
+	for (i = 0; i < 6; ++i) {
+		if (irq_status & (1 << i)) {
+			jz4740_dma_write_mask(dmadev,
+				JZ_REG_DMA_STATUS_CTRL(i), 0,
+				JZ_DMA_STATUS_CTRL_ENABLE |
+				JZ_DMA_STATUS_CTRL_TRANSFER_DONE);
+
+			jz4740_dma_chan_irq(&dmadev->chan[i]);
+		}
+	}
+
+	return IRQ_HANDLED;
+}
+
 static void jz4740_dma_issue_pending(struct dma_chan *c)
 {
 	struct jz4740_dmaengine_chan *chan = to_jz4740_dma_chan(c);
@@ -298,7 +464,8 @@ static struct dma_async_tx_descriptor *j
 static size_t jz4740_dma_desc_residue(struct jz4740_dmaengine_chan *chan,
 	struct jz4740_dma_desc *desc, unsigned int next_sg)
 {
-	size_t residue = 0;
+	struct jz4740_dma_dev *dmadev = jz4740_dma_chan_get_dev(chan);
+	unsigned int residue, count;
 	unsigned int i;
 
 	residue = 0;
@@ -306,8 +473,11 @@ static size_t jz4740_dma_desc_residue(st
 	for (i = next_sg; i < desc->num_sgs; i++)
 		residue += desc->sg[i].len;
 
-	if (next_sg != 0)
-		residue += jz4740_dma_get_residue(chan->jz_chan);
+	if (next_sg != 0) {
+		count = jz4740_dma_read(dmadev,
+			JZ_REG_DMA_TRANSFER_COUNT(chan->id));
+		residue += count << chan->transfer_shift;
+	}
 
 	return residue;
 }
@@ -342,24 +512,12 @@ static enum dma_status jz4740_dma_tx_sta
 
 static int jz4740_dma_alloc_chan_resources(struct dma_chan *c)
 {
-	struct jz4740_dmaengine_chan *chan = to_jz4740_dma_chan(c);
-
-	chan->jz_chan = jz4740_dma_request(chan, NULL);
-	if (!chan->jz_chan)
-		return -EBUSY;
-
-	jz4740_dma_set_complete_cb(chan->jz_chan, jz4740_dma_complete_cb);
-
 	return 0;
 }
 
 static void jz4740_dma_free_chan_resources(struct dma_chan *c)
 {
-	struct jz4740_dmaengine_chan *chan = to_jz4740_dma_chan(c);
-
-	vchan_free_chan_resources(&chan->vchan);
-	jz4740_dma_free(chan->jz_chan);
-	chan->jz_chan = NULL;
+	vchan_free_chan_resources(to_virt_chan(c));
 }
 
 static void jz4740_dma_desc_free(struct virt_dma_desc *vdesc)
@@ -373,7 +531,9 @@ static int jz4740_dma_probe(struct platf
 	struct jz4740_dma_dev *dmadev;
 	struct dma_device *dd;
 	unsigned int i;
+	struct resource *res;
 	int ret;
+	int irq;
 
 	dmadev = devm_kzalloc(&pdev->dev, sizeof(*dmadev), GFP_KERNEL);
 	if (!dmadev)
@@ -381,6 +541,17 @@ static int jz4740_dma_probe(struct platf
 
 	dd = &dmadev->ddev;
 
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	dmadev->base = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(dmadev->base))
+		return PTR_ERR(dmadev->base);
+
+	dmadev->clk = clk_get(&pdev->dev, "dma");
+	if (IS_ERR(dmadev->clk))
+		return PTR_ERR(dmadev->clk);
+
+	clk_prepare_enable(dmadev->clk);
+
 	dma_cap_set(DMA_SLAVE, dd->cap_mask);
 	dma_cap_set(DMA_CYCLIC, dd->cap_mask);
 	dd->device_alloc_chan_resources = jz4740_dma_alloc_chan_resources;
@@ -396,6 +567,7 @@ static int jz4740_dma_probe(struct platf
 
 	for (i = 0; i < dd->chancnt; i++) {
 		chan = &dmadev->chan[i];
+		chan->id = i;
 		chan->vchan.desc_free = jz4740_dma_desc_free;
 		vchan_init(&chan->vchan, dd);
 	}
@@ -404,16 +576,28 @@ static int jz4740_dma_probe(struct platf
 	if (ret)
 		return ret;
 
+	irq = platform_get_irq(pdev, 0);
+	ret = request_irq(irq, jz4740_dma_irq, 0, dev_name(&pdev->dev), dmadev);
+	if (ret)
+		goto err_unregister;
+
 	platform_set_drvdata(pdev, dmadev);
 
 	return 0;
+
+err_unregister:
+	dma_async_device_unregister(dd);
+	return ret;
 }
 
 static int jz4740_dma_remove(struct platform_device *pdev)
 {
 	struct jz4740_dma_dev *dmadev = platform_get_drvdata(pdev);
+	int irq = platform_get_irq(pdev, 0);
 
+	free_irq(irq, dmadev);
 	dma_async_device_unregister(&dmadev->ddev);
+	clk_disable_unprepare(dmadev->clk);
 
 	return 0;
 }