REG_RING_INT_CLEAR
iowrite32(BIT(bit), ring->nhi->iobase + REG_RING_INT_CLEAR);
iowrite32(BIT(bit), ring->nhi->iobase + REG_RING_INT_CLEAR +
iowrite32(~0, nhi->iobase + REG_RING_INT_CLEAR + ring);