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ns16550.h revision 1.1 
      1 /*	$Id: ns16550.h,v 1.1 1998/01/16 04:17:58 sakamoto Exp $	*/
      2 
      3 /*-
      4  * Copyright (C) 1995-1997 Gary Thomas (gdt (at) 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 	{
     39 		unsigned char rbr;  /* 0 */
     40 		unsigned char ier;  /* 1 */
     41 		unsigned char fcr;  /* 2 */
     42 		unsigned char lcr;  /* 3 */
     43 		unsigned char mcr;  /* 4 */
     44 		unsigned char lsr;  /* 5 */
     45 		unsigned char msr;  /* 6 */
     46 		unsigned char scr;  /* 7 */
     47 	};
     48 
     49 #define thr rbr
     50 #define iir fcr
     51 #define dll rbr
     52 #define dlm ier
     53 
     54 #define LSR_DR   0x01  /* Data ready */
     55 #define LSR_OE   0x02  /* Overrun */
     56 #define LSR_PE   0x04  /* Parity error */
     57 #define LSR_FE   0x08  /* Framing error */
     58 #define LSR_BI   0x10  /* Break */
     59 #define LSR_THRE 0x20  /* Xmit holding register empty */
     60 #define LSR_TEMT 0x40  /* Xmitter empty */
     61 #define LSR_ERR  0x80  /* Error */
     62 
     63 #define COM1	0x800003F8
     64 #define COM2	0x800002F8
     65 #define COM3	0x80000380
     66 #define COM4	0x80000388
     67 
     68