SNF_STA_CTL1
nfi_rmw32(snf, SNF_STA_CTL1, 0, CUS_READ_DONE);
nfi_write32(snf, SNF_STA_CTL1, 0);
nfi_rmw32(snf, SNF_STA_CTL1, 0, CUS_PG_DONE);
nfi_write32(snf, SNF_STA_CTL1, 0);
ret = readl_poll_timeout(snf->nfi_base + SNF_STA_CTL1, val,