arch/m68k/include/asm/serial.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * include/asm-m68k/serial.h
   4  *
   5  * currently this seems useful only for a Q40,
   6  * it's an almost exact copy of ../asm-alpha/serial.h
   7  *
   8  */
   9
  10
  11 /*
  12  * This assumes you have a 1.8432 MHz clock for your UART.
  13  *
  14  * It'd be nice if someone built a serial card with a 24.576 MHz
  15  * clock, since the 16550A is capable of handling a top speed of 1.5
  16  * megabits/second; but this requires the faster clock.
  17  */
  18 #define BASE_BAUD ( 1843200 / 16 )
  19
  20 /* Standard COM flags (except for COM4, because of the 8514 problem) */
  21 #ifdef CONFIG_SERIAL_8250_DETECT_IRQ
  22 #define STD_COM_FLAGS (UPF_BOOT_AUTOCONF | UPF_SKIP_TEST | UPF_AUTO_IRQ)
  23 #define STD_COM4_FLAGS (UPF_BOOT_AUTOCONF | UPF_AUTO_IRQ)
  24 #else
  25 #define STD_COM_FLAGS (UPF_BOOT_AUTOCONF | UPF_SKIP_TEST)
  26 #define STD_COM4_FLAGS UPF_BOOT_AUTOCONF
  27 #endif
  28
  29 #ifdef CONFIG_ISA
  30 #define SERIAL_PORT_DFNS                        \
  31         /* UART CLK   PORT IRQ     FLAGS        */                      \
  32         { 0, BASE_BAUD, 0x3F8, 4, STD_COM_FLAGS },      /* ttyS0 */     \
  33         { 0, BASE_BAUD, 0x2F8, 3, STD_COM_FLAGS },      /* ttyS1 */     \
  34         { 0, BASE_BAUD, 0x3E8, 4, STD_COM_FLAGS },      /* ttyS2 */     \
  35         { 0, BASE_BAUD, 0x2E8, 3, STD_COM4_FLAGS },     /* ttyS3 */
  36 #endif