DOC_IOREMAP_LEN
if (!request_mem_region(physadr, DOC_IOREMAP_LEN, "DiskOnChip"))
virtadr = ioremap(physadr, DOC_IOREMAP_LEN);
DOC_IOREMAP_LEN, physadr);
release_mem_region(physadr, DOC_IOREMAP_LEN);
release_mem_region(doc->physadr, DOC_IOREMAP_LEN);