arch/x86/include/asm/serial.h

   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 */