NFC_REG_USER_DATA_LEN
writel(0, nfc->regs + NFC_REG_USER_DATA_LEN(nfc, i));
val = readl(nfc->regs + NFC_REG_USER_DATA_LEN(nfc, step));
writel(val, nfc->regs + NFC_REG_USER_DATA_LEN(nfc, step));