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161 lines
4.9 KiB
C
161 lines
4.9 KiB
C
/* $NetBSD: com.c,v 1.4 2008/04/28 20:23:21 martin Exp $ */
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/*-
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* Copyright (c) 1998, 1999 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Charles M. Hannum.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* Copyright (c) 1991 The Regents of the University of California.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)com.c 7.5 (Berkeley) 5/16/91
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*/
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#include <sys/param.h>
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#include <lib/libsa/stand.h>
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#include <hpcmips/vr/vripreg.h>
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#include <hpcmips/vr/cmureg.h>
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#include <dev/ic/comreg.h>
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#include <dev/ic/ns16550reg.h>
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#include <dev/ic/st16650reg.h>
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#define com_lcr com_cfcr
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#include "extern.h"
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#if 0
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#define VRCOM_FREQ 18432000 /* 18.432kHz */
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#endif
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int
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iskey(void)
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{
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return ISSET(REGREAD_1(VR4181_SIU_ADDR, com_lsr), LSR_RXRDY);
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}
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int
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getchar(void)
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{
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u_int8_t stat;
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u_int8_t c;
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/* block until a character becomes available */
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while (!ISKEY)
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;
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c = REGREAD_1(VR4181_SIU_ADDR, com_data);
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stat = REGREAD_1(VR4181_SIU_ADDR, com_iir);
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return c;
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}
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static void
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comcnputc(int c)
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{
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int timo;
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/* wait for any pending transmission to finish */
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timo = 150000;
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while (!ISSET(REGREAD_1(VR4181_SIU_ADDR, com_lsr), LSR_TXRDY)
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&& --timo)
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continue;
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REGWRITE_1(VR4181_SIU_ADDR, com_data, c);
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/* wait for this transmission to complete */
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timo = 1500000;
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while (!ISSET(REGREAD_1(VR4181_SIU_ADDR, com_lsr), LSR_TXRDY)
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&& --timo)
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continue;
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}
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void
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putchar(int c)
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{
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if (c == '\n')
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comcnputc('\r');
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comcnputc(c);
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}
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/*
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* Initialize UART for use as console or KGDB line.
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*/
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void
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comcninit(void)
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{
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int rate;
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/* enable divisor latch access and set bit rate */
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REGWRITE_1(VR4181_SIU_ADDR, com_lcr, LCR_DLAB);
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rate = 10; /* 115200bps with VRCOM_FREQ */
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REGWRITE_1(VR4181_SIU_ADDR, com_dlbl, rate);
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REGWRITE_1(VR4181_SIU_ADDR, com_dlbh, rate >> 8);
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/*
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* disable divisor latch access and,
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* set "8bit non-parity 1 stop bit"
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*/
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REGWRITE_1(VR4181_SIU_ADDR, com_lcr, LCR_8BITS);
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/* disable all interrupt */
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REGWRITE_1(VR4181_SIU_ADDR, com_ier, 0);
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/* enable FIFO */
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REGWRITE_1(VR4181_SIU_ADDR, com_fifo,
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FIFO_ENABLE | FIFO_RCV_RST | FIFO_XMT_RST | FIFO_TRIGGER_1);
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/* set DTR and RTS low */
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REGWRITE_1(VR4181_SIU_ADDR, com_mcr, MCR_DTR | MCR_RTS);
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}
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