1 /* $NetBSD: ns16550.c,v 1.1 2003/06/25 17:24:22 cdi Exp $ */ 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 #ifdef CONS_SERIAL 34 /* 35 * NS16550 support 36 */ 37 38 #include <lib/libsa/stand.h> 39 #include "boot.h" 40 #include "ns16550.h" 41 42 int calculated_speed; 43 44 volatile struct NS16550 * 45 NS16550_init(addr, speed) 46 int addr; 47 int speed; 48 { 49 struct NS16550 *com_port; 50 51 com_port = (struct NS16550 *)(COMBASE + addr); 52 53 com_port->lcr = 0x80; /* Access baud rate */ 54 speed = comspeed(speed); 55 com_port->dll = speed; 56 com_port->dlm = speed >> 8; 57 58 com_port->lcr = 0x03; /* 8 data, 1 stop, no parity */ 59 com_port->mcr = 0x03; /* 8 bits */ 60 com_port->fcr = 0x07; /* Clear & enable FIFOs */ 61 com_port->ier = 0x00; 62 63 return (com_port); 64 } 65 66 void 67 NS16550_putc(com_port, c) 68 volatile struct NS16550 *com_port; 69 int c; 70 { 71 72 while ((com_port->lsr & LSR_THRE) == 0) 73 ; 74 com_port->thr = c; 75 } 76 77 int 78 NS16550_getc(com_port) 79 volatile struct NS16550 *com_port; 80 { 81 82 while ((com_port->lsr & LSR_DR) == 0) 83 ; 84 return (com_port->rbr); 85 } 86 87 int 88 NS16550_scankbd(com_port) 89 volatile struct NS16550 *com_port; 90 { 91 92 if ((com_port->lsr & LSR_DR) == 0) 93 return -1; 94 return (com_port->rbr); 95 } 96 97 int 98 NS16550_test(com_port) 99 volatile struct NS16550 *com_port; 100 { 101 102 return ((com_port->lsr & LSR_DR) != 0) 103 ; 104 } 105 #endif /* CONS_SERIAL */ 106