cas_init_block
off = offsetof(struct cas_init_block, tx_compwb);
memset(cp->init_block, 0, sizeof(struct cas_init_block));
dma_alloc_coherent(&pdev->dev, sizeof(struct cas_init_block),
dma_free_coherent(&pdev->dev, sizeof(struct cas_init_block),
dma_free_coherent(&pdev->dev, sizeof(struct cas_init_block),
struct cas_init_block *init_block;