sys/arch/prep/stand/boot/ns16550.h

   1 /*      $NetBSD$        */
   2
   3 /*-
   4  * Copyright (C) 1995-1997 Gary Thomas (gdt@linuxppc.org)
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. All advertising materials mentioning features or use of this software
  16  *    must display the following acknowledgement:
  17  *      This product includes software developed by Gary Thomas.
  18  * 4. The name of the author may not be used to endorse or promote products
  19  *    derived from this software without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  22  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  23  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  24  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  25  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  26  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  27  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  28  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  29  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  30  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  31  */
  32
  33 /*
  34  * NS16550 Serial Port
  35  */
  36
  37 struct NS16550 {
  38         volatile unsigned char rbr;  /* 0 */
  39         volatile unsigned char ier;  /* 1 */
  40         volatile unsigned char fcr;  /* 2 */
  41         volatile unsigned char lcr;  /* 3 */
  42         volatile unsigned char mcr;  /* 4 */
  43         volatile unsigned char lsr;  /* 5 */
  44         volatile unsigned char msr;  /* 6 */
  45         volatile unsigned char scr;  /* 7 */
  46 };
  47
  48 #define thr rbr
  49 #define iir fcr
  50 #define dll rbr
  51 #define dlm ier
  52
  53 #define LSR_DR   0x01  /* Data ready */
  54 #define LSR_OE   0x02  /* Overrun */
  55 #define LSR_PE   0x04  /* Parity error */
  56 #define LSR_FE   0x08  /* Framing error */
  57 #define LSR_BI   0x10  /* Break */
  58 #define LSR_THRE 0x20  /* Xmit holding register empty */
  59 #define LSR_TEMT 0x40  /* Xmitter empty */
  60 #define LSR_ERR  0x80  /* Error */
  61
  62 #define COMBASE 0x80000000
  63 #define COM1    0x3F8
  64 #define COM2    0x2F8
  65 #define COM3    0x380
  66 #define COM4    0x388
  67
  68 extern volatile struct NS16550 *NS16550_init(int, int);
  69 extern void NS16550_putc(volatile struct NS16550 *, int);
  70 extern int NS16550_getc(volatile struct NS16550 *);
  71 extern int NS16550_scankbd(volatile struct NS16550 *);
  72 extern int NS16550_test(volatile struct NS16550 *);