1 1.5 garbled /* $NetBSD: com.c,v 1.5 2006/04/10 18:40:06 garbled Exp $ */ 2 1.1 nonaka 3 1.1 nonaka /*- 4 1.1 nonaka * Copyright (c) 1993, 1994, 1995, 1996, 1997 5 1.1 nonaka * Charles M. Hannum. All rights reserved. 6 1.1 nonaka * 7 1.1 nonaka * Interrupt processing and hardware flow control partly based on code from 8 1.1 nonaka * Onno van der Linden and Gordon Ross. 9 1.1 nonaka * 10 1.1 nonaka * Redistribution and use in source and binary forms, with or without 11 1.1 nonaka * modification, are permitted provided that the following conditions 12 1.1 nonaka * are met: 13 1.1 nonaka * 1. Redistributions of source code must retain the above copyright 14 1.1 nonaka * notice, this list of conditions and the following disclaimer. 15 1.1 nonaka * 2. Redistributions in binary form must reproduce the above copyright 16 1.1 nonaka * notice, this list of conditions and the following disclaimer in the 17 1.1 nonaka * documentation and/or other materials provided with the distribution. 18 1.1 nonaka * 3. All advertising materials mentioning features or use of this software 19 1.1 nonaka * must display the following acknowledgement: 20 1.1 nonaka * This product includes software developed by Charles M. Hannum. 21 1.1 nonaka * 4. The name of the author may not be used to endorse or promote products 22 1.1 nonaka * derived from this software without specific prior written permission. 23 1.1 nonaka * 24 1.1 nonaka * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 25 1.1 nonaka * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 26 1.1 nonaka * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 27 1.1 nonaka * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 28 1.1 nonaka * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 29 1.1 nonaka * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 30 1.1 nonaka * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 31 1.1 nonaka * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 32 1.1 nonaka * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 33 1.1 nonaka * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 34 1.1 nonaka */ 35 1.1 nonaka 36 1.1 nonaka /* 37 1.1 nonaka * Copyright (c) 1991 The Regents of the University of California. 38 1.1 nonaka * All rights reserved. 39 1.1 nonaka * 40 1.1 nonaka * Redistribution and use in source and binary forms, with or without 41 1.1 nonaka * modification, are permitted provided that the following conditions 42 1.1 nonaka * are met: 43 1.1 nonaka * 1. Redistributions of source code must retain the above copyright 44 1.1 nonaka * notice, this list of conditions and the following disclaimer. 45 1.1 nonaka * 2. Redistributions in binary form must reproduce the above copyright 46 1.1 nonaka * notice, this list of conditions and the following disclaimer in the 47 1.1 nonaka * documentation and/or other materials provided with the distribution. 48 1.2 agc * 3. Neither the name of the University nor the names of its contributors 49 1.1 nonaka * may be used to endorse or promote products derived from this software 50 1.1 nonaka * without specific prior written permission. 51 1.1 nonaka * 52 1.1 nonaka * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 53 1.1 nonaka * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 54 1.1 nonaka * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 55 1.1 nonaka * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 56 1.1 nonaka * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 57 1.1 nonaka * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 58 1.1 nonaka * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 59 1.1 nonaka * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 60 1.1 nonaka * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 61 1.1 nonaka * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 62 1.1 nonaka * SUCH DAMAGE. 63 1.1 nonaka * 64 1.1 nonaka * @(#)com.c 7.5 (Berkeley) 5/16/91 65 1.1 nonaka */ 66 1.1 nonaka #ifdef CONS_SERIAL 67 1.1 nonaka 68 1.1 nonaka #include <lib/libsa/stand.h> 69 1.1 nonaka 70 1.1 nonaka #include "boot.h" 71 1.1 nonaka 72 1.1 nonaka #define COM_FREQ 1843200 /* 16-bit baud rate divisor */ 73 1.1 nonaka #define COM_TOLERANCE 30 /* baud rate tolerance, in 0.1% units */ 74 1.1 nonaka 75 1.1 nonaka int 76 1.5 garbled comspeed(long speed) 77 1.1 nonaka { 78 1.1 nonaka #define divrnd(n, q) (((n)*2/(q)+1)/2) /* divide and round off */ 79 1.1 nonaka 80 1.1 nonaka int x, err; 81 1.1 nonaka 82 1.1 nonaka if (speed <= 0) 83 1.1 nonaka return (-1); 84 1.1 nonaka x = divrnd((COM_FREQ / 16), speed); 85 1.1 nonaka if (x <= 0) 86 1.1 nonaka return (-1); 87 1.1 nonaka err = divrnd((COM_FREQ / 16) * 1000, speed * x) - 1000; 88 1.1 nonaka if (err < 0) 89 1.1 nonaka err = -err; 90 1.1 nonaka if (err > COM_TOLERANCE) 91 1.1 nonaka return (-1); 92 1.1 nonaka return (x); 93 1.1 nonaka 94 1.3 he #undef divrnd 95 1.1 nonaka } 96 1.1 nonaka #endif /* CONS_SERIAL */ 97
Indexes created Mon Sep 22 05:09:51 GMT 2025