mpc8313的DMA的例程

pinglet

有人做过这方面的工作吗？可否给点思路或则例程啊？

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huangxianguo

也要用，加我，一起学习啊 MSN：huang_xianguo@hotmail.com

huangxianguo

DMA mode, use the 8313E as the DMAC to read/write the PCI target card, if reading ,it's failed, if writing, it's successful! why?
the corrective code list as:
 
 
 
    void __iomem *DMA_BASE = ioremap(get_immrbase() + DMA_OFFSET, 0x300);
    void __iomem *DMA_SR = DMA_BASE + DMASR0;
    void __iomem *DMA_MR = DMA_BASE + DMAMR0;
    void __iomem *DMA_SAR = DMA_BASE + DMASAR0;
    void __iomem *DMA_DAR = DMA_BASE + DMADAR0;
    void __iomem *DMA_BCR = DMA_BASE + DMABCR0;
    printk(KERN_INFO "dma prepare2!\n");
    if(mypci_card->channels == 0)
    {    // Source Address
        out_le32(DMA_SAR, mypci_card->bs_addr[1].base);
        // Destination Address
        out_le32(DMA_DAR, mypci_card->dmabuf.dma_addr);
        // Counter
        out_le32(DMA_BCR, 0x100);
        // DMA mode
        reg = DMAMR_CTM | DMAMR_SEN PRC_H;//|DMAMR_IRQS|DMAMR_EOTIE; //后两项开启DMA中断
        out_le32(DMA_MR, reg);
        printk("Going to start transfer: 0x%08lx->0x%08lx(0x%08lx) mode=0x%08lx\n",
            (long unsigned int) in_le32(DMA_SAR), (long unsigned int)in_le32(DMA_DAR),(long unsigned int) in_le32(DMA_BCR), (long unsigned int)in_le32(DMA_MR));
        // Start transfer
        reg |= DMAMR_CS;
        msleep(1);
        out_le32(DMA_MR, reg);
        reg = in_le32(DMA_SR);
        while (reg & DMASR_CB) {        //此处请采用中断方式处理
            printk("CB=1\n");
            reg = in_le32(DMA_SR);
        }
        printk("Done! DMA Status=0x%x\n", reg);
    }
    else
    {
        printk("channel error\n");
    }
    iounmap(DMA_BASE);