read_csr_ring_head
u32 (*read_csr_ring_head)(void __iomem *csr_base_addr, u32 bank,
state->rings[i].head = ops->read_csr_ring_head(base, bank, i);
csr_ops->read_csr_ring_head = read_csr_ring_head;
csr_ops->read_csr_ring_head = read_csr_ring_head;
head = csr_ops->read_csr_ring_head(csr, bank->bank_number,
head = csr_ops->read_csr_ring_head(csr, bank->bank_number,