SNF_MAC_CTL
nfi_write32(snf, SNF_MAC_CTL, SF_MAC_EN);
nfi_write32(snf, SNF_MAC_CTL, SF_MAC_EN | SF_TRIG);
ret = readl_poll_timeout(snf->nfi_base + SNF_MAC_CTL, val,
ret = readl_poll_timeout(snf->nfi_base + SNF_MAC_CTL, val, !(val & WIP),
nfi_write32(snf, SNF_MAC_CTL, 0);