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 */