erdma_reg_read32
u32 val = erdma_reg_read32(dev, reg);
dev->proto = erdma_reg_read32(dev, ERDMA_REGS_DEV_PROTO_REG);
version = erdma_reg_read32(dev, ERDMA_REGS_VERSION_REG);
mac = erdma_reg_read32(dev, ERDMA_REGS_NETDEV_MAC_L_REG);
mac |= (u64)erdma_reg_read32(dev, ERDMA_REGS_NETDEV_MAC_H_REG) << 32;