21 static void early_serial_init(int port, int baud)  in early_serial_init()  argument
26 	outb(0x3, port + LCR);	/* 8n1 */  in early_serial_init()
27 	outb(0, port + IER);	/* no interrupt */  in early_serial_init()
28 	outb(0, port + FCR);	/* no fifo */  in early_serial_init()
29 	outb(0x3, port + MCR);	/* DTR + RTS */  in early_serial_init()
32 	c = inb(port + LCR);  in early_serial_init()
33 	outb(c | DLAB, port + LCR);  in early_serial_init()
34 	outb(divisor & 0xff, port + DLL);  in early_serial_init()
35 	outb((divisor >> 8) & 0xff, port + DLH);  in early_serial_init()
36 	outb(c & ~DLAB, port + LCR);  in early_serial_init()
38 	early_serial_base = port;  in early_serial_init()
46 	int port = 0;  in parse_earlyprintk()  local
52 			port = DEFAULT_SERIAL_PORT;  in parse_earlyprintk()
66 			port = simple_strtoull(arg + pos, &e, 16);  in parse_earlyprintk()
67 			if (port == 0 || arg + pos == e)  in parse_earlyprintk()
68 				port = DEFAULT_SERIAL_PORT;  in parse_earlyprintk()
81 			port = bases[idx];  in parse_earlyprintk()
92 	if (port)  in parse_earlyprintk()
93 		early_serial_init(port, baud);  in parse_earlyprintk()
97 static unsigned int probe_baud(int port)  in probe_baud()  argument
102 	lcr = inb(port + LCR);  in probe_baud()
103 	outb(lcr | DLAB, port + LCR);  in probe_baud()
104 	dll = inb(port + DLL);  in probe_baud()
105 	dlh = inb(port + DLH);  in probe_baud()
106 	outb(lcr, port + LCR);  in probe_baud()
116 	int port = 0;  in parse_console_uart8250()  local
128 		port = simple_strtoull(options + 12, &options, 0);  in parse_console_uart8250()
130 		port = simple_strtoull(options + 8, &options, 0);  in parse_console_uart8250()
137 		baud = probe_baud(port);  in parse_console_uart8250()
139 	if (port)  in parse_console_uart8250()
140 		early_serial_init(port, baud);  in parse_console_uart8250()