read_csr_ring_head
u32 (*read_csr_ring_head)(struct resource *csr_base_addr,
head = csr_ops->read_csr_ring_head(csr,
head = csr_ops->read_csr_ring_head(csr,
tx_head = csr_ops->read_csr_ring_head(bundle->csr_base,
csr_ops->read_csr_ring_head = read_csr_ring_head;
csr_ops->read_csr_ring_head = read_csr_ring_head;
csr_ops->read_csr_ring_head = read_csr_ring_head;