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