1. 根目录:
2. arch
3. blackfin
4. mach-bf533
5. dma.c

/*
 * simple DMA Implementation for Blackfin
 *
 * Copyright 2007-2009 Analog Devices Inc.
 *
 * Licensed under the GPL-2 or later.
 */

#include <linux/module.h>

#include <asm/blackfin.h>
#include <asm/dma.h>

struct dma_register * const dma_io_base_addr[MAX_DMA_CHANNELS] = {
	(struct dma_register *) DMA0_NEXT_DESC_PTR,
	(struct dma_register *) DMA1_NEXT_DESC_PTR,
	(struct dma_register *) DMA2_NEXT_DESC_PTR,
	(struct dma_register *) DMA3_NEXT_DESC_PTR,
	(struct dma_register *) DMA4_NEXT_DESC_PTR,
	(struct dma_register *) DMA5_NEXT_DESC_PTR,
	(struct dma_register *) DMA6_NEXT_DESC_PTR,
	(struct dma_register *) DMA7_NEXT_DESC_PTR,
	(struct dma_register *) MDMA_D0_NEXT_DESC_PTR,
	(struct dma_register *) MDMA_S0_NEXT_DESC_PTR,
	(struct dma_register *) MDMA_D1_NEXT_DESC_PTR,
	(struct dma_register *) MDMA_S1_NEXT_DESC_PTR,
};
EXPORT_SYMBOL(dma_io_base_addr);

int channel2irq(unsigned int channel)
{
	int ret_irq = -1;

	switch (channel) {
	case CH_PPI:
		ret_irq = IRQ_PPI;
		break;

	case CH_SPORT0_RX:
		ret_irq = IRQ_SPORT0_RX;
		break;

	case CH_SPORT0_TX:
		ret_irq = IRQ_SPORT0_TX;
		break;

	case CH_SPORT1_RX:
		ret_irq = IRQ_SPORT1_RX;
		break;

	case CH_SPORT1_TX:
		ret_irq = IRQ_SPORT1_TX;
		break;

	case CH_SPI:
		ret_irq = IRQ_SPI;
		break;

	case CH_UART0_RX:
		ret_irq = IRQ_UART0_RX;
		break;

	case CH_UART0_TX:
		ret_irq = IRQ_UART0_TX;
		break;

	case CH_MEM_STREAM0_SRC:
	case CH_MEM_STREAM0_DEST:
		ret_irq = IRQ_MEM_DMA0;
		break;

	case CH_MEM_STREAM1_SRC:
	case CH_MEM_STREAM1_DEST:
		ret_irq = IRQ_MEM_DMA1;
		break;
	}
	return ret_irq;
}