ISA_DMA_MASK
dma_addr_t max_dma = pdev ? pdev->dma_mask : ISA_DMA_MASK;
max_dma = pdev ? pdev->dma_mask : ISA_DMA_MASK;
max_dma = pdev ? pdev->dma_mask : ISA_DMA_MASK;
outb(chan & 3, isa_dma_port[chan][ISA_DMA_MASK]);
outb(chan | 4, isa_dma_port[chan][ISA_DMA_MASK]);