serial.h 1.11 KB
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/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _ASM_X86_SERIAL_H
#define _ASM_X86_SERIAL_H
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/*
 * This assumes you have a 1.8432 MHz clock for your UART.
 *
 * It'd be nice if someone built a serial card with a 24.576 MHz
 * clock, since the 16550A is capable of handling a top speed of 1.5
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 * megabits/second; but this requires a faster clock.
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 */
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#define BASE_BAUD (1843200/16)
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/* Standard COM flags (except for COM4, because of the 8514 problem) */
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#ifdef CONFIG_SERIAL_8250_DETECT_IRQ
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# define STD_COMX_FLAGS	(UPF_BOOT_AUTOCONF |	UPF_SKIP_TEST	| UPF_AUTO_IRQ)
# define STD_COM4_FLAGS	(UPF_BOOT_AUTOCONF |	0		| UPF_AUTO_IRQ)
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#else
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# define STD_COMX_FLAGS	(UPF_BOOT_AUTOCONF |	UPF_SKIP_TEST	| 0		)
# define STD_COM4_FLAGS	(UPF_BOOT_AUTOCONF |	0		| 0		)
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#endif
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#define SERIAL_PORT_DFNS								\
	/* UART		CLK		PORT	IRQ	FLAGS			    */	\
	{ .uart = 0,	BASE_BAUD,	0x3F8,	4,	STD_COMX_FLAGS	}, /* ttyS0 */	\
	{ .uart = 0,	BASE_BAUD,	0x2F8,	3,	STD_COMX_FLAGS	}, /* ttyS1 */	\
	{ .uart = 0,	BASE_BAUD,	0x3E8,	4,	STD_COMX_FLAGS	}, /* ttyS2 */	\
	{ .uart = 0,	BASE_BAUD,	0x2E8,	3,	STD_COM4_FLAGS	}, /* ttyS3 */
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#endif /* _ASM_X86_SERIAL_H */