arch/mips/vr4181/common/serial.c

   1 /*
   2  * Copyright 2001 MontaVista Software Inc.
   3  * Author: Jun Sun, jsun@mvista.com or jsun@junsun.net
   4  *
   5  * arch/mips/vr4181/common/serial.c
   6  *     initialize serial port on vr4181.
   7  *
   8  * This program is free software; you can redistribute  it and/or modify it
   9  * under  the terms of  the GNU General  Public License as published by the
  10  * Free Software Foundation;  either version 2 of the  License, or (at your
  11  * option) any later version.
  12  *
  13  */
  14
  15 /*
  16  * [jsun, 010925]
  17  * You need to make sure rs_table has at least one element in
  18  * drivers/char/serial.c file.  There is no good way to do it right
  19  * now.  A workaround is to include CONFIG_SERIAL_MANY_PORTS in your
  20  * configure file, which would gives you 64 ports and wastes 11K ram.
  21  */
  22
  23 #include <linux/types.h>
  24 #include <linux/kernel.h>
  25 #include <linux/init.h>
  26 #include <linux/serial.h>
  27
  28 #include <asm/vr4181/vr4181.h>
  29
  30 void __init vr4181_init_serial(void)
  31 {
  32         struct serial_struct s;
  33
  34         /* turn on UART clock */
  35         *VR4181_CMUCLKMSK |= VR4181_CMUCLKMSK_MSKSIU;
  36
  37         /* clear memory */
  38         memset(&s, 0, sizeof(s));
  39
  40         s.line = 0;                     /* we set the first one */
  41         s.baud_base = 1152000;
  42         s.irq = VR4181_IRQ_SIU;
  43         s.flags = ASYNC_BOOT_AUTOCONF | ASYNC_SKIP_TEST; /* STD_COM_FLAGS */
  44         s.iomem_base = (u8*)VR4181_SIURB;
  45         s.iomem_reg_shift = 0;
  46         s.io_type = SERIAL_IO_MEM;
  47         if (early_serial_setup(&s) != 0) {
  48                 panic("vr4181_init_serial() failed!");
  49         }
  50 }
  51