75 static unsigned int dw8250_get_divisor(struct uart_port *p, unsigned int baud,  in dw8250_get_divisor()  argument
79 	struct dw8250_port_data *d = p->private_data;  in dw8250_get_divisor()
81 	quot = p->uartclk / base_baud;  in dw8250_get_divisor()
82 	rem = p->uartclk % base_baud;  in dw8250_get_divisor()
88 static void dw8250_set_divisor(struct uart_port *p, unsigned int baud,  in dw8250_set_divisor()  argument
91 	dw8250_writel_ext(p, DW_UART_DLF, quot_frac);  in dw8250_set_divisor()
92 	serial8250_do_set_divisor(p, baud, quot, quot_frac);  in dw8250_set_divisor()
95 void dw8250_do_set_termios(struct uart_port *p, struct ktermios *termios,  in dw8250_do_set_termios()  argument
98 	p->status &= ~UPSTAT_AUTOCTS;  in dw8250_do_set_termios()
100 		p->status |= UPSTAT_AUTOCTS;  in dw8250_do_set_termios()
102 	serial8250_do_set_termios(p, termios, old);  in dw8250_do_set_termios()
105 	p->ignore_status_mask |= DW_UART_LSR_ADDR_RCVD;  in dw8250_do_set_termios()
106 	p->read_status_mask |= DW_UART_LSR_ADDR_RCVD;  in dw8250_do_set_termios()
117 static void dw8250_wait_re_deassert(struct uart_port *p)  in dw8250_wait_re_deassert()  argument
119 	ndelay(p->frame_time);  in dw8250_wait_re_deassert()
122 static void dw8250_update_rar(struct uart_port *p, u32 addr)  in dw8250_update_rar()  argument
124 	u32 re_en = dw8250_readl_ext(p, DW_UART_RE_EN);  in dw8250_update_rar()
131 		dw8250_writel_ext(p, DW_UART_RE_EN, 0);  in dw8250_update_rar()
132 	dw8250_wait_re_deassert(p);  in dw8250_update_rar()
133 	dw8250_writel_ext(p, DW_UART_RAR, addr);  in dw8250_update_rar()
135 		dw8250_writel_ext(p, DW_UART_RE_EN, re_en);  in dw8250_update_rar()
138 static void dw8250_rs485_set_addr(struct uart_port *p, struct serial_rs485 *rs485,  in dw8250_rs485_set_addr()  argument
141 	u32 lcr = dw8250_readl_ext(p, DW_UART_LCR_EXT);  in dw8250_rs485_set_addr()
149 			u32 delta = p->rs485.flags ^ rs485->flags;  in dw8250_rs485_set_addr()
155 			if (unlikely(&p->rs485 == rs485))  in dw8250_rs485_set_addr()
159 			    (p->rs485.addr_recv != rs485->addr_recv))  in dw8250_rs485_set_addr()
160 				dw8250_update_rar(p, rs485->addr_recv);  in dw8250_rs485_set_addr()
171 			dw8250_writel_ext(p, DW_UART_TAR, rs485->addr_dest);  in dw8250_rs485_set_addr()
177 	dw8250_writel_ext(p, DW_UART_LCR_EXT, lcr);  in dw8250_rs485_set_addr()
180 static int dw8250_rs485_config(struct uart_port *p, struct ktermios *termios,  in dw8250_rs485_config()  argument
185 	tcr = dw8250_readl_ext(p, DW_UART_TCR);  in dw8250_rs485_config()
195 		dw8250_writel_ext(p, DW_UART_DE_EN, 1);  in dw8250_rs485_config()
196 		dw8250_writel_ext(p, DW_UART_RE_EN, 1);  in dw8250_rs485_config()
210 	if (device_property_read_bool(p->dev, "rs485-rx-active-high"))  in dw8250_rs485_config()
213 	dw8250_writel_ext(p, DW_UART_TCR, tcr);  in dw8250_rs485_config()
217 		dw8250_rs485_set_addr(p, rs485, termios);  in dw8250_rs485_config()
226 static bool dw8250_detect_rs485_hw(struct uart_port *p)  in dw8250_detect_rs485_hw()  argument
230 	dw8250_writel_ext(p, DW_UART_RE_EN, 1);  in dw8250_detect_rs485_hw()
231 	reg = dw8250_readl_ext(p, DW_UART_RE_EN);  in dw8250_detect_rs485_hw()
232 	dw8250_writel_ext(p, DW_UART_RE_EN, 0);  in dw8250_detect_rs485_hw()
242 void dw8250_setup_port(struct uart_port *p)  in dw8250_setup_port()  argument
244 	struct dw8250_port_data *pd = p->private_data;  in dw8250_setup_port()
245 	struct uart_8250_port *up = up_to_u8250p(p);  in dw8250_setup_port()
248 	pd->hw_rs485_support = dw8250_detect_rs485_hw(p);  in dw8250_setup_port()
250 		p->rs485_config = dw8250_rs485_config;  in dw8250_setup_port()
252 		p->rs485_supported = dw8250_rs485_supported;  in dw8250_setup_port()
254 		p->rs485_config = serial8250_em485_config;  in dw8250_setup_port()
255 		p->rs485_supported = serial8250_em485_supported;  in dw8250_setup_port()
265 	reg = dw8250_readl_ext(p, DW_UART_UCV);  in dw8250_setup_port()
269 	dev_dbg(p->dev, "Designware UART version %c.%c%c\n",  in dw8250_setup_port()
273 	old_dlf = dw8250_readl_ext(p, DW_UART_DLF);  in dw8250_setup_port()
274 	dw8250_writel_ext(p, DW_UART_DLF, ~0U);  in dw8250_setup_port()
275 	reg = dw8250_readl_ext(p, DW_UART_DLF);  in dw8250_setup_port()
276 	dw8250_writel_ext(p, DW_UART_DLF, old_dlf);  in dw8250_setup_port()
280 		p->get_divisor = dw8250_get_divisor;  in dw8250_setup_port()
281 		p->set_divisor = dw8250_set_divisor;  in dw8250_setup_port()
284 	reg = dw8250_readl_ext(p, DW_UART_CPR);  in dw8250_setup_port()
287 		dev_dbg(p->dev, "CPR is not available, using 0x%08x instead\n", reg);  in dw8250_setup_port()
294 		p->type = PORT_16550A;  in dw8250_setup_port()
295 		p->flags |= UPF_FIXED_TYPE;  in dw8250_setup_port()
296 		p->fifosize = DW_UART_CPR_FIFO_SIZE(reg);  in dw8250_setup_port()