dma.c

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/*
 * the simple DMA Implementation for Blackfin
 *
 * Copyright 2007-2008 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 *) DMA1_0_NEXT_DESC_PTR,
    (struct dma_register *) DMA1_1_NEXT_DESC_PTR,
    (struct dma_register *) DMA1_2_NEXT_DESC_PTR,
    (struct dma_register *) DMA1_3_NEXT_DESC_PTR,
    (struct dma_register *) DMA1_4_NEXT_DESC_PTR,
    (struct dma_register *) DMA1_5_NEXT_DESC_PTR,
    (struct dma_register *) DMA1_6_NEXT_DESC_PTR,
    (struct dma_register *) DMA1_7_NEXT_DESC_PTR,
    (struct dma_register *) DMA1_8_NEXT_DESC_PTR,
    (struct dma_register *) DMA1_9_NEXT_DESC_PTR,
    (struct dma_register *) DMA1_10_NEXT_DESC_PTR,
    (struct dma_register *) DMA1_11_NEXT_DESC_PTR,
    (struct dma_register *) DMA2_0_NEXT_DESC_PTR,
    (struct dma_register *) DMA2_1_NEXT_DESC_PTR,
    (struct dma_register *) DMA2_2_NEXT_DESC_PTR,
    (struct dma_register *) DMA2_3_NEXT_DESC_PTR,
    (struct dma_register *) DMA2_4_NEXT_DESC_PTR,
    (struct dma_register *) DMA2_5_NEXT_DESC_PTR,
    (struct dma_register *) DMA2_6_NEXT_DESC_PTR,
    (struct dma_register *) DMA2_7_NEXT_DESC_PTR,
    (struct dma_register *) DMA2_8_NEXT_DESC_PTR,
    (struct dma_register *) DMA2_9_NEXT_DESC_PTR,
    (struct dma_register *) DMA2_10_NEXT_DESC_PTR,
    (struct dma_register *) DMA2_11_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,
    (struct dma_register *) MDMA_D2_NEXT_DESC_PTR,
    (struct dma_register *) MDMA_S2_NEXT_DESC_PTR,
    (struct dma_register *) MDMA_D3_NEXT_DESC_PTR,
    (struct dma_register *) MDMA_S3_NEXT_DESC_PTR,
    (struct dma_register *) IMDMA_D0_NEXT_DESC_PTR,
    (struct dma_register *) IMDMA_S0_NEXT_DESC_PTR,
    (struct dma_register *) IMDMA_D1_NEXT_DESC_PTR,
    (struct dma_register *) IMDMA_S1_NEXT_DESC_PTR,
};
EXPORT_SYMBOL(dma_io_base_addr);

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

    switch (channel) {
    case CH_PPI0:
        ret_irq = IRQ_PPI0;
        break;
    case CH_PPI1:
        ret_irq = IRQ_PPI1;
        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_UART_RX:
        ret_irq = IRQ_UART_RX;
        break;
    case CH_UART_TX:
        ret_irq = IRQ_UART_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;
    case CH_MEM_STREAM2_SRC:
    case CH_MEM_STREAM2_DEST:
        ret_irq = IRQ_MEM_DMA2;
        break;
    case CH_MEM_STREAM3_SRC:
    case CH_MEM_STREAM3_DEST:
        ret_irq = IRQ_MEM_DMA3;
        break;

    case CH_IMEM_STREAM0_SRC:
    case CH_IMEM_STREAM0_DEST:
        ret_irq = IRQ_IMEM_DMA0;
        break;
    case CH_IMEM_STREAM1_SRC:
    case CH_IMEM_STREAM1_DEST:
        ret_irq = IRQ_IMEM_DMA1;
        break;
    }
    return ret_irq;
}