1 /* $NetBSD: ns16550.c,v 1.8 2009/03/14 15:36:04 dsl 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 volatile struct NS16550 * 43 NS16550_init(int addr, int speed) 44 { 45 struct NS16550 *com_port; 46 47 com_port = (struct NS16550 *)(COMBASE + addr); 48 49 com_port->lcr = 0x80; /* Access baud rate */ 50 speed = comspeed(speed); 51 com_port->dll = speed; 52 com_port->dlm = speed >> 8; 53 54 com_port->lcr = 0x03; /* 8 data, 1 stop, no parity */ 55 com_port->mcr = 0x00; 56 com_port->fcr = 0x07; /* Clear & enable FIFOs */ 57 com_port->ier = 0x00; 58 59 return (com_port); 60 } 61 62 void 63 NS16550_putc(volatile struct NS16550 *com_port, int c) 64 { 65 while ((com_port->lsr & LSR_THRE) == 0) 66 ; 67 com_port->thr = c; 68 } 69 70 int 71 NS16550_getc(volatile struct NS16550 *com_port) 72 { 73 while ((com_port->lsr & LSR_DR) == 0) 74 ; 75 return (com_port->rbr); 76 } 77 78 int 79 NS16550_scankbd(volatile struct NS16550 *com_port) 80 { 81 if ((com_port->lsr & LSR_DR) == 0) 82 return -1; 83 return (com_port->rbr); 84 } 85 86 int 87 NS16550_test(volatile struct NS16550 *com_port) 88 { 89 return ((com_port->lsr & LSR_DR) != 0); 90 } 91 #endif /* CONS_SERIAL */ 92