183 	u32 tcr;  in dw8250_rs485_config()  local
185 	tcr = dw8250_readl_ext(p, DW_UART_TCR);  in dw8250_rs485_config()
186 	tcr &= ~DW_UART_TCR_XFER_MODE;  in dw8250_rs485_config()
189 		tcr |= DW_UART_TCR_RS485_EN;  in dw8250_rs485_config()
192 			tcr |= DW_UART_TCR_XFER_MODE_DE_DURING_RE;  in dw8250_rs485_config()
194 			tcr |= DW_UART_TCR_XFER_MODE_DE_OR_RE;  in dw8250_rs485_config()
201 		tcr &= ~DW_UART_TCR_RS485_EN;  in dw8250_rs485_config()
205 	tcr |= DW_UART_TCR_DE_POL;  in dw8250_rs485_config()
206 	tcr &= ~DW_UART_TCR_RE_POL;  in dw8250_rs485_config()
209 		tcr &= ~DW_UART_TCR_DE_POL;  in dw8250_rs485_config()
211 		tcr |= DW_UART_TCR_RE_POL;  in dw8250_rs485_config()
213 	dw8250_writel_ext(p, DW_UART_TCR, tcr);  in dw8250_rs485_config()