write_csr_ring_head
void (*write_csr_ring_head)(struct resource *csr_base_addr,
csr_ops->write_csr_ring_head = write_csr_ring_head;
csr_ops->write_csr_ring_head = write_csr_ring_head;
csr_ops->write_csr_ring_head = write_csr_ring_head;
csr_ops->write_csr_ring_head(ring->bank->csr_addr,