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