1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _ASM_X86_SERIAL_H
3#define _ASM_X86_SERIAL_H
4
5/*
6 * This assumes you have a 1.8432 MHz clock for your UART.
7 *
8 * It'd be nice if someone built a serial card with a 24.576 MHz
9 * clock, since the 16550A is capable of handling a top speed of 1.5
10 * megabits/second; but this requires a faster clock.
11 */
12#define BASE_BAUD (1843200/16)
13
14/* Standard COM flags (except for COM4, because of the 8514 problem) */
15#ifdef CONFIG_SERIAL_8250_DETECT_IRQ
16# define STD_COMX_FLAGS	(UPF_BOOT_AUTOCONF |	UPF_SKIP_TEST	| UPF_AUTO_IRQ)
17# define STD_COM4_FLAGS	(UPF_BOOT_AUTOCONF |	0		| UPF_AUTO_IRQ)
18#else
19# define STD_COMX_FLAGS	(UPF_BOOT_AUTOCONF |	UPF_SKIP_TEST	| 0		)
20# define STD_COM4_FLAGS	(UPF_BOOT_AUTOCONF |	0		| 0		)
21#endif
22
23#define SERIAL_PORT_DFNS								\
24	/* UART		CLK		PORT	IRQ	FLAGS			    */	\
25	{ .uart = 0,	BASE_BAUD,	0x3F8,	4,	STD_COMX_FLAGS	}, /* ttyS0 */	\
26	{ .uart = 0,	BASE_BAUD,	0x2F8,	3,	STD_COMX_FLAGS	}, /* ttyS1 */	\
27	{ .uart = 0,	BASE_BAUD,	0x3E8,	4,	STD_COMX_FLAGS	}, /* ttyS2 */	\
28	{ .uart = 0,	BASE_BAUD,	0x2E8,	3,	STD_COM4_FLAGS	}, /* ttyS3 */
29
30#endif /* _ASM_X86_SERIAL_H */
31