Book a Demo!
CoCalc Logo Icon
StoreFeaturesDocsShareSupportNewsAboutPoliciesSign UpSign In
awilliam
GitHub Repository: awilliam/linux-vfio
 Path: blob/master/arch/blackfin/mach-bf533/dma.c
10817 views
1
/*

2
 * simple DMA Implementation for Blackfin

3
 *

4
 * Copyright 2007-2009 Analog Devices Inc.

5
 *

6
 * Licensed under the GPL-2 or later.

7
 */

8


9
#include <linux/module.h>

10


11
#include <asm/blackfin.h>

12
#include <asm/dma.h>

13


14
struct dma_register * const dma_io_base_addr[MAX_DMA_CHANNELS] = {

15
	(struct dma_register *) DMA0_NEXT_DESC_PTR,

16
	(struct dma_register *) DMA1_NEXT_DESC_PTR,

17
	(struct dma_register *) DMA2_NEXT_DESC_PTR,

18
	(struct dma_register *) DMA3_NEXT_DESC_PTR,

19
	(struct dma_register *) DMA4_NEXT_DESC_PTR,

20
	(struct dma_register *) DMA5_NEXT_DESC_PTR,

21
	(struct dma_register *) DMA6_NEXT_DESC_PTR,

22
	(struct dma_register *) DMA7_NEXT_DESC_PTR,

23
	(struct dma_register *) MDMA_D0_NEXT_DESC_PTR,

24
	(struct dma_register *) MDMA_S0_NEXT_DESC_PTR,

25
	(struct dma_register *) MDMA_D1_NEXT_DESC_PTR,

26
	(struct dma_register *) MDMA_S1_NEXT_DESC_PTR,

27
};

28
EXPORT_SYMBOL(dma_io_base_addr);

29


30
int channel2irq(unsigned int channel)

31
{

32
	int ret_irq = -1;

33


34
	switch (channel) {

35
	case CH_PPI:

36
		ret_irq = IRQ_PPI;

37
		break;

38


39
	case CH_SPORT0_RX:

40
		ret_irq = IRQ_SPORT0_RX;

41
		break;

42


43
	case CH_SPORT0_TX:

44
		ret_irq = IRQ_SPORT0_TX;

45
		break;

46


47
	case CH_SPORT1_RX:

48
		ret_irq = IRQ_SPORT1_RX;

49
		break;

50


51
	case CH_SPORT1_TX:

52
		ret_irq = IRQ_SPORT1_TX;

53
		break;

54


55
	case CH_SPI:

56
		ret_irq = IRQ_SPI;

57
		break;

58


59
	case CH_UART0_RX:

60
		ret_irq = IRQ_UART0_RX;

61
		break;

62


63
	case CH_UART0_TX:

64
		ret_irq = IRQ_UART0_TX;

65
		break;

66


67
	case CH_MEM_STREAM0_SRC:

68
	case CH_MEM_STREAM0_DEST:

69
		ret_irq = IRQ_MEM_DMA0;

70
		break;

71


72
	case CH_MEM_STREAM1_SRC:

73
	case CH_MEM_STREAM1_DEST:

74
		ret_irq = IRQ_MEM_DMA1;

75
		break;

76
	}

77
	return ret_irq;

78
}

79


80