ADF_RING_CSR_RING_TAIL
ADF_RING_CSR_RING_TAIL + ((ring) << 2))
ADF_RING_CSR_RING_TAIL + ((ring) << 2), value)
ADF_RING_CSR_RING_TAIL + ((ring) << 2), value)
ADF_RING_CSR_RING_TAIL + ((ring) << 2))