IOBMAP_PAGE_SIZE
bus_addr += IOBMAP_PAGE_SIZE;
bus_addr += IOBMAP_PAGE_SIZE;
tmp = memblock_phys_alloc(IOBMAP_PAGE_SIZE, IOBMAP_PAGE_SIZE);
#define IOBMAP_PAGE_MASK (IOBMAP_PAGE_SIZE - 1)
uaddr += IOBMAP_PAGE_SIZE;