TN40_REG_MDIO_CMD
writel(i, regs + TN40_REG_MDIO_CMD);
writel(TN40_MDIO_CMD_READ | i, regs + TN40_REG_MDIO_CMD);
writel(TN40_MDIO_CMD_VAL(device, port), regs + TN40_REG_MDIO_CMD);