BAM_DESC_FIFO_SIZE
dma_free_wc(bdev->dev, BAM_DESC_FIFO_SIZE,
#define MAX_DESCRIPTORS (BAM_DESC_FIFO_SIZE / sizeof(struct bam_desc_hw) - 1)
bchan->fifo_virt = dma_alloc_wc(bdev->dev, BAM_DESC_FIFO_SIZE,
dma_free_wc(bdev->dev, BAM_DESC_FIFO_SIZE, bchan->fifo_virt,