1324 lines
32 KiB
C
1324 lines
32 KiB
C
/*
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* Copyright (c) 1988 University of Utah.
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* Copyright (c) 1982, 1986, 1990 The Regents of the University of California.
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* All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* the Systems Programming Group of the University of Utah Computer
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* Science Department.
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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. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. 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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* from: Utah Hdr: dcm.c 1.26 91/01/21
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* from: @(#)dcm.c 7.14 (Berkeley) 6/27/91
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* $Id: dcm.c,v 1.9 1993/08/29 13:46:32 deraadt Exp $
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*/
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/*
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* TODO:
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* Timeouts
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* Test console support.
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*/
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#include "dcm.h"
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#if NDCM > 0
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/*
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* 98642/MUX
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*/
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#include "sys/param.h"
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#include "sys/systm.h"
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#include "sys/ioctl.h"
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#include "sys/tty.h"
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#include "sys/proc.h"
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#include "sys/conf.h"
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#include "sys/file.h"
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#include "sys/uio.h"
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#include "sys/kernel.h"
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#include "sys/syslog.h"
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#include "sys/time.h"
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#include "device.h"
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#include "dcmreg.h"
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#include "machine/cpu.h"
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#include "../hp300/isr.h"
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#ifndef DEFAULT_BAUD_RATE
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#define DEFAULT_BAUD_RATE 9600
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#endif
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int ttrstrt();
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int dcmprobe(), dcmintr(), dcmparam();
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void dcmstart();
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struct driver dcmdriver = {
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dcmprobe, "dcm",
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};
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#define NDCMLINE (NDCM*4)
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struct tty *dcm_tty[NDCMLINE];
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struct modemreg *dcm_modem[NDCMLINE];
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char mcndlast[NDCMLINE]; /* XXX last modem status for line */
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int ndcm = NDCMLINE;
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int dcm_active;
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int dcmsoftCAR[NDCM];
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struct dcmdevice *dcm_addr[NDCM];
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struct isr dcmisr[NDCM];
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struct speedtab dcmspeedtab[] = {
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0, BR_0,
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50, BR_50,
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75, BR_75,
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110, BR_110,
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134, BR_134,
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150, BR_150,
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300, BR_300,
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600, BR_600,
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1200, BR_1200,
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1800, BR_1800,
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2400, BR_2400,
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4800, BR_4800,
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9600, BR_9600,
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19200, BR_19200,
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38400, BR_38400,
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-1, -1
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};
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/* u-sec per character based on baudrate (assumes 1 start/8 data/1 stop bit) */
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#define DCM_USPERCH(s) (10000000 / (s))
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/*
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* Per board interrupt scheme. 16.7ms is the polling interrupt rate
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* (16.7ms is about 550 baud, 38.4k is 72 chars in 16.7ms).
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*/
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#define DIS_TIMER 0
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#define DIS_PERCHAR 1
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#define DIS_RESET 2
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int dcmistype = -1; /* -1 == dynamic, 0 == timer, 1 == perchar */
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int dcminterval = 5; /* interval (secs) between checks */
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struct dcmischeme {
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int dis_perchar; /* non-zero if interrupting per char */
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long dis_time; /* last time examined */
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int dis_intr; /* recv interrupts during last interval */
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int dis_char; /* characters read during last interval */
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} dcmischeme[NDCM];
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/*
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* Console support
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*/
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#ifdef DCMCONSOLE
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int dcmconsole = DCMCONSOLE;
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#else
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int dcmconsole = -1;
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#endif
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int dcmconsinit;
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int dcmdefaultrate = DEFAULT_BAUD_RATE;
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int dcmconbrdbusy = 0;
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int dcmmajor;
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extern struct tty *constty;
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#ifdef KGDB
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/*
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* Kernel GDB support
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*/
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#include "machine/remote-sl.h"
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extern dev_t kgdb_dev;
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extern int kgdb_rate;
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extern int kgdb_debug_init;
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#endif
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/* #define IOSTATS */
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#ifdef DEBUG
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int dcmdebug = 0x0;
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#define DDB_SIOERR 0x01
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#define DDB_PARAM 0x02
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#define DDB_INPUT 0x04
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#define DDB_OUTPUT 0x08
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#define DDB_INTR 0x10
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#define DDB_IOCTL 0x20
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#define DDB_INTSCHM 0x40
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#define DDB_MODEM 0x80
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#define DDB_OPENCLOSE 0x100
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#endif
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#ifdef IOSTATS
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#define DCMRBSIZE 94
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#define DCMXBSIZE 24
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struct dcmstats {
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long xints; /* # of xmit ints */
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long xchars; /* # of xmit chars */
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long xempty; /* times outq is empty in dcmstart */
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long xrestarts; /* times completed while xmitting */
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long rints; /* # of recv ints */
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long rchars; /* # of recv chars */
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long xsilo[DCMXBSIZE+2]; /* times this many chars xmit on one int */
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long rsilo[DCMRBSIZE+2]; /* times this many chars read on one int */
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} dcmstats[NDCM];
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#endif
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#define UNIT(x) minor(x)
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#define BOARD(x) (((x) >> 2) & 0x3f)
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#define PORT(x) ((x) & 3)
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#define MKUNIT(b,p) (((b) << 2) | (p))
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/*
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* Conversion from "HP DCE" to almost-normal DCE: on the 638 8-port mux,
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* the distribution panel uses "HP DCE" conventions. If requested via
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* the device flags, we swap the inputs to something closer to normal DCE,
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* allowing a straight-through cable to a DTE or a reversed cable
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* to a DCE (reversing 2-3, 4-5, 8-20 and leaving 6 unconnected;
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* this gets "DCD" on pin 20 and "CTS" on 4, but doesn't connect
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* DSR or make RTS work, though). The following gives the full
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* details of a cable from this mux panel to a modem:
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*
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* HP modem
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* name pin pin name
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* HP inputs:
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* "Rx" 2 3 Tx
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* CTS 4 5 CTS (only needed for CCTS_OFLOW)
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* DCD 20 8 DCD
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* "DSR" 9 6 DSR (unneeded)
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* RI 22 22 RI (unneeded)
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*
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* HP outputs:
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* "Tx" 3 2 Rx
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* "DTR" 6 not connected
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* "RTS" 8 20 DTR
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* "SR" 23 4 RTS (often not needed)
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*/
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#define FLAG_STDDCE 0x10 /* map inputs if this bit is set in flags */
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#define hp2dce_in(ibits) (iconv[(ibits) & 0xf])
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static char iconv[16] = {
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0, MI_DM, MI_CTS, MI_CTS|MI_DM,
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MI_CD, MI_CD|MI_DM, MI_CD|MI_CTS, MI_CD|MI_CTS|MI_DM,
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MI_RI, MI_RI|MI_DM, MI_RI|MI_CTS, MI_RI|MI_CTS|MI_DM,
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MI_RI|MI_CD, MI_RI|MI_CD|MI_DM, MI_RI|MI_CD|MI_CTS,
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MI_RI|MI_CD|MI_CTS|MI_DM
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};
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dcmprobe(hd)
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register struct hp_device *hd;
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{
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register struct dcmdevice *dcm;
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register int i;
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register int timo = 0;
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int s, brd, isconsole, mbits;
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dcm = (struct dcmdevice *)hd->hp_addr;
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if ((dcm->dcm_rsid & 0x1f) != DCMID)
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return (0);
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brd = hd->hp_unit;
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isconsole = (brd == BOARD(dcmconsole));
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/*
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* XXX selected console device (CONSUNIT) as determined by
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* dcmcnprobe does not agree with logical numbering imposed
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* by the config file (i.e. lowest address DCM is not unit
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* CONSUNIT). Don't recognize this card.
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*/
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if (isconsole && dcm != dcm_addr[BOARD(dcmconsole)])
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return (0);
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/*
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* Empirically derived self-test magic
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*/
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s = spltty();
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dcm->dcm_rsid = DCMRS;
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DELAY(50000); /* 5000 is not long enough */
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dcm->dcm_rsid = 0;
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dcm->dcm_ic = IC_IE;
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dcm->dcm_cr = CR_SELFT;
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while ((dcm->dcm_ic & IC_IR) == 0)
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if (++timo == 20000)
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return (0);
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DELAY(50000) /* XXX why is this needed ???? */
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while ((dcm->dcm_iir & IIR_SELFT) == 0)
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if (++timo == 400000)
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return (0);
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DELAY(50000) /* XXX why is this needed ???? */
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if (dcm->dcm_stcon != ST_OK) {
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if (!isconsole)
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printf("dcm%d: self test failed: %x\n",
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brd, dcm->dcm_stcon);
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return (0);
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}
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dcm->dcm_ic = IC_ID;
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splx(s);
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hd->hp_ipl = DCMIPL(dcm->dcm_ic);
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dcm_addr[brd] = dcm;
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dcm_active |= 1 << brd;
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dcmsoftCAR[brd] = hd->hp_flags;
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dcmisr[brd].isr_ipl = hd->hp_ipl;
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dcmisr[brd].isr_arg = brd;
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dcmisr[brd].isr_intr = dcmintr;
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isrlink(&dcmisr[brd]);
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#ifdef KGDB
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if (major(kgdb_dev) == dcmmajor && BOARD(kgdb_dev) == brd) {
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if (dcmconsole == UNIT(kgdb_dev))
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kgdb_dev = NODEV; /* can't debug over console port */
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#ifndef KGDB_CHEAT
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/*
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* The following could potentially be replaced
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* by the corresponding code in dcmcnprobe.
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*/
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else {
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(void) dcminit(kgdb_dev, kgdb_rate);
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if (kgdb_debug_init) {
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printf("dcm%d: ", UNIT(kgdb_dev));
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kgdb_connect(1);
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} else
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printf("dcm%d: kgdb enabled\n", UNIT(kgdb_dev));
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}
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/* end could be replaced */
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#endif
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}
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#endif
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if (dcmistype == DIS_TIMER)
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dcmsetischeme(brd, DIS_RESET|DIS_TIMER);
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else
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dcmsetischeme(brd, DIS_RESET|DIS_PERCHAR);
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/* load pointers to modem control */
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dcm_modem[MKUNIT(brd, 0)] = &dcm->dcm_modem0;
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dcm_modem[MKUNIT(brd, 1)] = &dcm->dcm_modem1;
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dcm_modem[MKUNIT(brd, 2)] = &dcm->dcm_modem2;
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dcm_modem[MKUNIT(brd, 3)] = &dcm->dcm_modem3;
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/* set DCD (modem) and CTS (flow control) on all ports */
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if (dcmsoftCAR[brd] & FLAG_STDDCE)
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mbits = hp2dce_in(MI_CD|MI_CTS);
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else
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mbits = MI_CD|MI_CTS;
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for (i = 0; i < 4; i++)
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dcm_modem[MKUNIT(brd, i)]->mdmmsk = mbits;
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dcm->dcm_ic = IC_IE; /* turn all interrupts on */
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/*
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* Need to reset baud rate, etc. of next print so reset dcmconsole.
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* Also make sure console is always "hardwired"
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*/
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if (isconsole) {
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dcmconsinit = 0;
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dcmsoftCAR[brd] |= (1 << PORT(dcmconsole));
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}
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return (1);
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}
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/* ARGSUSED */
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#ifdef __STDC__
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dcmopen(dev_t dev, int flag, int mode, struct proc *p)
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#else
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dcmopen(dev, flag, mode, p)
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dev_t dev;
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int flag, mode;
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struct proc *p;
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#endif
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{
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register struct tty *tp;
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register int unit, brd;
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int error = 0, mbits;
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unit = UNIT(dev);
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brd = BOARD(unit);
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if (unit >= NDCMLINE || (dcm_active & (1 << brd)) == 0)
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return (ENXIO);
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if(!dcm_tty[unit])
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tp = dcm_tty[unit] = ttymalloc();
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else
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tp = dcm_tty[unit];
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tp->t_oproc = dcmstart;
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tp->t_param = dcmparam;
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tp->t_dev = dev;
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if ((tp->t_state & TS_ISOPEN) == 0) {
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tp->t_state |= TS_WOPEN;
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ttychars(tp);
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if (tp->t_ispeed == 0) {
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tp->t_iflag = TTYDEF_IFLAG;
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tp->t_oflag = TTYDEF_OFLAG;
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tp->t_cflag = TTYDEF_CFLAG;
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tp->t_lflag = TTYDEF_LFLAG;
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tp->t_ispeed = tp->t_ospeed = TTYDEF_SPEED;
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}
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(void) dcmparam(tp, &tp->t_termios);
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ttsetwater(tp);
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} else if (tp->t_state&TS_XCLUDE && p->p_ucred->cr_uid != 0)
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return (EBUSY);
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mbits = MO_ON;
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if (dcmsoftCAR[brd] & FLAG_STDDCE)
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mbits |= MO_SR; /* pin 23, could be used as RTS */
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(void) dcmmctl(dev, mbits, DMSET); /* enable port */
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if ((dcmsoftCAR[brd] & (1 << PORT(unit))) ||
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(dcmmctl(dev, MO_OFF, DMGET) & MI_CD))
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tp->t_state |= TS_CARR_ON;
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#ifdef DEBUG
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if (dcmdebug & DDB_MODEM)
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printf("dcm%d: dcmopen port %d softcarr %c\n",
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brd, unit, (tp->t_state & TS_CARR_ON) ? '1' : '0');
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#endif
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(void) spltty();
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while ((flag&O_NONBLOCK) == 0 && (tp->t_cflag&CLOCAL) == 0 &&
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(tp->t_state & TS_CARR_ON) == 0) {
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tp->t_state |= TS_WOPEN;
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if (error = ttysleep(tp, (caddr_t)&tp->t_rawq, TTIPRI | PCATCH,
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ttopen, 0))
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break;
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}
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(void) spl0();
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#ifdef DEBUG
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if (dcmdebug & DDB_OPENCLOSE)
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printf("dcmopen: u %x st %x fl %x\n",
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unit, tp->t_state, tp->t_flags);
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#endif
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if (error == 0)
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error = (*linesw[tp->t_line].l_open)(dev, tp);
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return (error);
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}
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/*ARGSUSED*/
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dcmclose(dev, flag, mode, p)
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dev_t dev;
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int flag, mode;
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struct proc *p;
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{
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register struct tty *tp;
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int unit;
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unit = UNIT(dev);
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tp = dcm_tty[unit];
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(*linesw[tp->t_line].l_close)(tp, flag);
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if (tp->t_cflag&HUPCL || tp->t_state&TS_WOPEN ||
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(tp->t_state&TS_ISOPEN) == 0)
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(void) dcmmctl(dev, MO_OFF, DMSET);
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#ifdef DEBUG
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if (dcmdebug & DDB_OPENCLOSE)
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printf("dcmclose: u %x st %x fl %x\n",
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unit, tp->t_state, tp->t_flags);
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#endif
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ttyclose(tp);
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ttyfree(tp);
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dcm_tty[unit] = (struct tty *)NULL;
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return (0);
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}
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dcmread(dev, uio, flag)
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dev_t dev;
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struct uio *uio;
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{
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register struct tty *tp;
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tp = dcm_tty[UNIT(dev)];
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return ((*linesw[tp->t_line].l_read)(tp, uio, flag));
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}
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dcmwrite(dev, uio, flag)
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dev_t dev;
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struct uio *uio;
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{
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int unit = UNIT(dev);
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register struct tty *tp;
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tp = dcm_tty[unit];
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/*
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* XXX we disallow virtual consoles if the physical console is
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* a serial port. This is in case there is a display attached that
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* is not the console. In that situation we don't need/want the X
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* server taking over the console.
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*/
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if (constty && unit == dcmconsole)
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constty = NULL;
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return ((*linesw[tp->t_line].l_write)(tp, uio, flag));
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}
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dcmintr(brd)
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register int brd;
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{
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register struct dcmdevice *dcm = dcm_addr[brd];
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register struct dcmischeme *dis;
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register int unit = MKUNIT(brd, 0);
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register int code, i;
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int pcnd[4], mcode, mcnd[4];
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|
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/*
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* Do all guarded register accesses right off to minimize
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* block out of hardware.
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*/
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SEM_LOCK(dcm);
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if ((dcm->dcm_ic & IC_IR) == 0) {
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SEM_UNLOCK(dcm);
|
|
return (0);
|
|
}
|
|
for (i = 0; i < 4; i++) {
|
|
pcnd[i] = dcm->dcm_icrtab[i].dcm_data;
|
|
dcm->dcm_icrtab[i].dcm_data = 0;
|
|
code = dcm_modem[unit+i]->mdmin;
|
|
if (dcmsoftCAR[brd] & FLAG_STDDCE)
|
|
code = hp2dce_in(code);
|
|
mcnd[i] = code;
|
|
}
|
|
code = dcm->dcm_iir & IIR_MASK;
|
|
dcm->dcm_iir = 0; /* XXX doc claims read clears interrupt?! */
|
|
mcode = dcm->dcm_modemintr;
|
|
dcm->dcm_modemintr = 0;
|
|
SEM_UNLOCK(dcm);
|
|
|
|
#ifdef DEBUG
|
|
if (dcmdebug & DDB_INTR) {
|
|
printf("dcmintr(%d): iir %x pc %x/%x/%x/%x ",
|
|
brd, code, pcnd[0], pcnd[1], pcnd[2], pcnd[3]);
|
|
printf("miir %x mc %x/%x/%x/%x\n",
|
|
mcode, mcnd[0], mcnd[1], mcnd[2], mcnd[3]);
|
|
}
|
|
#endif
|
|
if (code & IIR_TIMEO)
|
|
dcmrint(brd, dcm);
|
|
if (code & IIR_PORT0)
|
|
dcmpint(unit+0, pcnd[0], dcm);
|
|
if (code & IIR_PORT1)
|
|
dcmpint(unit+1, pcnd[1], dcm);
|
|
if (code & IIR_PORT2)
|
|
dcmpint(unit+2, pcnd[2], dcm);
|
|
if (code & IIR_PORT3)
|
|
dcmpint(unit+3, pcnd[3], dcm);
|
|
if (code & IIR_MODM) {
|
|
if (mcode == 0 || mcode & 0x1) /* mcode==0 -> 98642 board */
|
|
dcmmint(unit+0, mcnd[0], dcm);
|
|
if (mcode & 0x2)
|
|
dcmmint(unit+1, mcnd[1], dcm);
|
|
if (mcode & 0x4)
|
|
dcmmint(unit+2, mcnd[2], dcm);
|
|
if (mcode & 0x8)
|
|
dcmmint(unit+3, mcnd[3], dcm);
|
|
}
|
|
|
|
dis = &dcmischeme[brd];
|
|
/*
|
|
* Chalk up a receiver interrupt if the timer running or one of
|
|
* the ports reports a special character interrupt.
|
|
*/
|
|
if ((code & IIR_TIMEO) ||
|
|
((pcnd[0]|pcnd[1]|pcnd[2]|pcnd[3]) & IT_SPEC))
|
|
dis->dis_intr++;
|
|
/*
|
|
* See if it is time to check/change the interrupt rate.
|
|
*/
|
|
if (dcmistype < 0 &&
|
|
(i = time.tv_sec - dis->dis_time) >= dcminterval) {
|
|
/*
|
|
* If currently per-character and averaged over 70 interrupts
|
|
* per-second (66 is threshold of 600 baud) in last interval,
|
|
* switch to timer mode.
|
|
*
|
|
* XXX decay counts ala load average to avoid spikes?
|
|
*/
|
|
if (dis->dis_perchar && dis->dis_intr > 70 * i)
|
|
dcmsetischeme(brd, DIS_TIMER);
|
|
/*
|
|
* If currently using timer and had more interrupts than
|
|
* received characters in the last interval, switch back
|
|
* to per-character. Note that after changing to per-char
|
|
* we must process any characters already in the queue
|
|
* since they may have arrived before the bitmap was setup.
|
|
*
|
|
* XXX decay counts?
|
|
*/
|
|
else if (!dis->dis_perchar && dis->dis_intr > dis->dis_char) {
|
|
dcmsetischeme(brd, DIS_PERCHAR);
|
|
dcmrint(brd, dcm);
|
|
}
|
|
dis->dis_intr = dis->dis_char = 0;
|
|
dis->dis_time = time.tv_sec;
|
|
}
|
|
return (1);
|
|
}
|
|
|
|
/*
|
|
* Port interrupt. Can be two things:
|
|
* First, it might be a special character (exception interrupt);
|
|
* Second, it may be a buffer empty (transmit interrupt);
|
|
*/
|
|
dcmpint(unit, code, dcm)
|
|
int unit, code;
|
|
struct dcmdevice *dcm;
|
|
{
|
|
struct tty *tp = dcm_tty[unit];
|
|
|
|
if (code & IT_SPEC)
|
|
dcmreadbuf(unit, dcm, tp);
|
|
if (code & IT_TX)
|
|
dcmxint(unit, dcm, tp);
|
|
}
|
|
|
|
dcmrint(brd, dcm)
|
|
int brd;
|
|
register struct dcmdevice *dcm;
|
|
{
|
|
register int i, unit;
|
|
register struct tty *tp;
|
|
|
|
unit = MKUNIT(brd, 0);
|
|
tp = dcm_tty[unit];
|
|
for (i = 0; i < 4; i++, tp++, unit++)
|
|
dcmreadbuf(unit, dcm, tp);
|
|
}
|
|
|
|
dcmreadbuf(unit, dcm, tp)
|
|
int unit;
|
|
register struct dcmdevice *dcm;
|
|
register struct tty *tp;
|
|
{
|
|
int port = PORT(unit);
|
|
register struct dcmpreg *pp = dcm_preg(dcm, port);
|
|
register struct dcmrfifo *fifo;
|
|
register int c, stat;
|
|
register unsigned head;
|
|
int nch = 0;
|
|
#ifdef IOSTATS
|
|
struct dcmstats *dsp = &dcmstats[BOARD(unit)];
|
|
|
|
dsp->rints++;
|
|
#endif
|
|
if ((tp->t_state & TS_ISOPEN) == 0) {
|
|
#ifdef KGDB
|
|
if ((makedev(dcmmajor, unit) == kgdb_dev) &&
|
|
(head = pp->r_head & RX_MASK) != (pp->r_tail & RX_MASK) &&
|
|
dcm->dcm_rfifos[3-port][head>>1].data_char == FRAME_END) {
|
|
pp->r_head = (head + 2) & RX_MASK;
|
|
kgdb_connect(0); /* trap into kgdb */
|
|
return;
|
|
}
|
|
#endif /* KGDB */
|
|
pp->r_head = pp->r_tail & RX_MASK;
|
|
return;
|
|
}
|
|
|
|
head = pp->r_head & RX_MASK;
|
|
fifo = &dcm->dcm_rfifos[3-port][head>>1];
|
|
/*
|
|
* XXX upper bound on how many chars we will take in one swallow?
|
|
*/
|
|
while (head != (pp->r_tail & RX_MASK)) {
|
|
/*
|
|
* Get character/status and update head pointer as fast
|
|
* as possible to make room for more characters.
|
|
*/
|
|
c = fifo->data_char;
|
|
stat = fifo->data_stat;
|
|
head = (head + 2) & RX_MASK;
|
|
pp->r_head = head;
|
|
fifo = head ? fifo+1 : &dcm->dcm_rfifos[3-port][0];
|
|
nch++;
|
|
|
|
#ifdef DEBUG
|
|
if (dcmdebug & DDB_INPUT)
|
|
printf("dcmreadbuf(%d): c%x('%c') s%x f%x h%x t%x\n",
|
|
unit, c&0xFF, c, stat&0xFF,
|
|
tp->t_flags, head, pp->r_tail);
|
|
#endif
|
|
/*
|
|
* Check for and handle errors
|
|
*/
|
|
if (stat & RD_MASK) {
|
|
#ifdef DEBUG
|
|
if (dcmdebug & (DDB_INPUT|DDB_SIOERR))
|
|
printf("dcmreadbuf(%d): err: c%x('%c') s%x\n",
|
|
unit, stat, c&0xFF, c);
|
|
#endif
|
|
if (stat & (RD_BD | RD_FE))
|
|
c |= TTY_FE;
|
|
else if (stat & RD_PE)
|
|
c |= TTY_PE;
|
|
else if (stat & RD_OVF)
|
|
log(LOG_WARNING,
|
|
"dcm%d: silo overflow\n", unit);
|
|
else if (stat & RD_OE)
|
|
log(LOG_WARNING,
|
|
"dcm%d: uart overflow\n", unit);
|
|
}
|
|
(*linesw[tp->t_line].l_rint)(c, tp);
|
|
}
|
|
dcmischeme[BOARD(unit)].dis_char += nch;
|
|
#ifdef IOSTATS
|
|
dsp->rchars += nch;
|
|
if (nch <= DCMRBSIZE)
|
|
dsp->rsilo[nch]++;
|
|
else
|
|
dsp->rsilo[DCMRBSIZE+1]++;
|
|
#endif
|
|
}
|
|
|
|
dcmxint(unit, dcm, tp)
|
|
int unit;
|
|
struct dcmdevice *dcm;
|
|
register struct tty *tp;
|
|
{
|
|
tp->t_state &= ~TS_BUSY;
|
|
if (tp->t_state & TS_FLUSH)
|
|
tp->t_state &= ~TS_FLUSH;
|
|
(*linesw[tp->t_line].l_start)(tp);
|
|
}
|
|
|
|
dcmmint(unit, mcnd, dcm)
|
|
register int unit;
|
|
register struct dcmdevice *dcm;
|
|
int mcnd;
|
|
{
|
|
register struct tty *tp;
|
|
int delta;
|
|
|
|
#ifdef DEBUG
|
|
if (dcmdebug & DDB_MODEM)
|
|
printf("dcmmint: port %d mcnd %x mcndlast %x\n",
|
|
unit, mcnd, mcndlast[unit]);
|
|
#endif
|
|
tp = dcm_tty[unit];
|
|
delta = mcnd ^ mcndlast[unit];
|
|
mcndlast[unit] = mcnd;
|
|
if ((delta & MI_CTS) && (tp->t_state & TS_ISOPEN) &&
|
|
(tp->t_flags & CCTS_OFLOW)) {
|
|
if (mcnd & MI_CTS) {
|
|
tp->t_state &= ~TS_TTSTOP;
|
|
ttstart(tp);
|
|
} else
|
|
tp->t_state |= TS_TTSTOP; /* inline dcmstop */
|
|
}
|
|
if (delta & MI_CD) {
|
|
if (mcnd & MI_CD)
|
|
(void)(*linesw[tp->t_line].l_modem)(tp, 1);
|
|
else if ((dcmsoftCAR[BOARD(unit)] & (1 << PORT(unit))) == 0 &&
|
|
(*linesw[tp->t_line].l_modem)(tp, 0) == 0) {
|
|
dcm_modem[unit]->mdmout = MO_OFF;
|
|
SEM_LOCK(dcm);
|
|
dcm->dcm_modemchng |= 1<<(unit & 3);
|
|
dcm->dcm_cr |= CR_MODM;
|
|
SEM_UNLOCK(dcm);
|
|
DELAY(10); /* time to change lines */
|
|
}
|
|
}
|
|
}
|
|
|
|
dcmioctl(dev, cmd, data, flag)
|
|
dev_t dev;
|
|
caddr_t data;
|
|
{
|
|
register struct tty *tp;
|
|
register int unit = UNIT(dev);
|
|
register struct dcmdevice *dcm;
|
|
register int port;
|
|
int error, s;
|
|
|
|
#ifdef DEBUG
|
|
if (dcmdebug & DDB_IOCTL)
|
|
printf("dcmioctl: unit %d cmd %x data %x flag %x\n",
|
|
unit, cmd, *data, flag);
|
|
#endif
|
|
tp = dcm_tty[unit];
|
|
error = (*linesw[tp->t_line].l_ioctl)(tp, cmd, data, flag);
|
|
if (error >= 0)
|
|
return (error);
|
|
error = ttioctl(tp, cmd, data, flag);
|
|
if (error >= 0)
|
|
return (error);
|
|
|
|
port = PORT(unit);
|
|
dcm = dcm_addr[BOARD(unit)];
|
|
switch (cmd) {
|
|
case TIOCSBRK:
|
|
/*
|
|
* Wait for transmitter buffer to empty
|
|
*/
|
|
s = spltty();
|
|
while (dcm->dcm_thead[port].ptr != dcm->dcm_ttail[port].ptr)
|
|
DELAY(DCM_USPERCH(tp->t_ospeed));
|
|
SEM_LOCK(dcm);
|
|
dcm->dcm_cmdtab[port].dcm_data |= CT_BRK;
|
|
dcm->dcm_cr |= (1 << port); /* start break */
|
|
SEM_UNLOCK(dcm);
|
|
splx(s);
|
|
break;
|
|
|
|
case TIOCCBRK:
|
|
SEM_LOCK(dcm);
|
|
dcm->dcm_cmdtab[port].dcm_data |= CT_BRK;
|
|
dcm->dcm_cr |= (1 << port); /* end break */
|
|
SEM_UNLOCK(dcm);
|
|
break;
|
|
|
|
case TIOCSDTR:
|
|
(void) dcmmctl(dev, MO_ON, DMBIS);
|
|
break;
|
|
|
|
case TIOCCDTR:
|
|
(void) dcmmctl(dev, MO_ON, DMBIC);
|
|
break;
|
|
|
|
case TIOCMSET:
|
|
(void) dcmmctl(dev, *(int *)data, DMSET);
|
|
break;
|
|
|
|
case TIOCMBIS:
|
|
(void) dcmmctl(dev, *(int *)data, DMBIS);
|
|
break;
|
|
|
|
case TIOCMBIC:
|
|
(void) dcmmctl(dev, *(int *)data, DMBIC);
|
|
break;
|
|
|
|
case TIOCMGET:
|
|
*(int *)data = dcmmctl(dev, 0, DMGET);
|
|
break;
|
|
|
|
default:
|
|
return (ENOTTY);
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
dcmparam(tp, t)
|
|
register struct tty *tp;
|
|
register struct termios *t;
|
|
{
|
|
register struct dcmdevice *dcm;
|
|
register int port, mode, cflag = t->c_cflag;
|
|
int ospeed = ttspeedtab(t->c_ospeed, dcmspeedtab);
|
|
|
|
/* check requested parameters */
|
|
if (ospeed < 0 || (t->c_ispeed && t->c_ispeed != t->c_ospeed))
|
|
return (EINVAL);
|
|
/* and copy to tty */
|
|
tp->t_ispeed = t->c_ispeed;
|
|
tp->t_ospeed = t->c_ospeed;
|
|
tp->t_cflag = cflag;
|
|
if (ospeed == 0) {
|
|
(void) dcmmctl(UNIT(tp->t_dev), MO_OFF, DMSET);
|
|
return (0);
|
|
}
|
|
|
|
mode = 0;
|
|
switch (cflag&CSIZE) {
|
|
case CS5:
|
|
mode = LC_5BITS; break;
|
|
case CS6:
|
|
mode = LC_6BITS; break;
|
|
case CS7:
|
|
mode = LC_7BITS; break;
|
|
case CS8:
|
|
mode = LC_8BITS; break;
|
|
}
|
|
if (cflag&PARENB) {
|
|
if (cflag&PARODD)
|
|
mode |= LC_PODD;
|
|
else
|
|
mode |= LC_PEVEN;
|
|
}
|
|
if (cflag&CSTOPB)
|
|
mode |= LC_2STOP;
|
|
else
|
|
mode |= LC_1STOP;
|
|
#ifdef DEBUG
|
|
if (dcmdebug & DDB_PARAM)
|
|
printf("dcmparam(%d): cflag %x mode %x speed %d uperch %d\n",
|
|
UNIT(tp->t_dev), cflag, mode, tp->t_ospeed,
|
|
DCM_USPERCH(tp->t_ospeed));
|
|
#endif
|
|
|
|
port = PORT(tp->t_dev);
|
|
dcm = dcm_addr[BOARD(tp->t_dev)];
|
|
/*
|
|
* Wait for transmitter buffer to empty.
|
|
*/
|
|
while (dcm->dcm_thead[port].ptr != dcm->dcm_ttail[port].ptr)
|
|
DELAY(DCM_USPERCH(tp->t_ospeed));
|
|
/*
|
|
* Make changes known to hardware.
|
|
*/
|
|
dcm->dcm_data[port].dcm_baud = ospeed;
|
|
dcm->dcm_data[port].dcm_conf = mode;
|
|
SEM_LOCK(dcm);
|
|
dcm->dcm_cmdtab[port].dcm_data |= CT_CON;
|
|
dcm->dcm_cr |= (1 << port);
|
|
SEM_UNLOCK(dcm);
|
|
/*
|
|
* Delay for config change to take place. Weighted by baud.
|
|
* XXX why do we do this?
|
|
*/
|
|
DELAY(16 * DCM_USPERCH(tp->t_ospeed));
|
|
return (0);
|
|
}
|
|
|
|
void
|
|
dcmstart(tp)
|
|
register struct tty *tp;
|
|
{
|
|
register struct dcmdevice *dcm;
|
|
register struct dcmpreg *pp;
|
|
register struct dcmtfifo *fifo;
|
|
register char *bp;
|
|
register unsigned tail, next;
|
|
register int port, nch;
|
|
unsigned head;
|
|
char buf[16];
|
|
int s;
|
|
#ifdef IOSTATS
|
|
struct dcmstats *dsp = &dcmstats[BOARD(tp->t_dev)];
|
|
int tch = 0;
|
|
#endif
|
|
|
|
s = spltty();
|
|
#ifdef IOSTATS
|
|
dsp->xints++;
|
|
#endif
|
|
#ifdef DEBUG
|
|
if (dcmdebug & DDB_OUTPUT)
|
|
printf("dcmstart(%d): state %x flags %x outcc %d\n",
|
|
UNIT(tp->t_dev), tp->t_state, tp->t_flags,
|
|
tp->t_outq.c_cc);
|
|
#endif
|
|
if (tp->t_state & (TS_TIMEOUT|TS_BUSY|TS_TTSTOP))
|
|
goto out;
|
|
if (tp->t_outq.c_cc <= tp->t_lowat) {
|
|
if (tp->t_state&TS_ASLEEP) {
|
|
tp->t_state &= ~TS_ASLEEP;
|
|
wakeup((caddr_t)&tp->t_outq);
|
|
}
|
|
selwakeup(&tp->t_wsel);
|
|
}
|
|
if (tp->t_outq.c_cc == 0) {
|
|
#ifdef IOSTATS
|
|
dsp->xempty++;
|
|
#endif
|
|
goto out;
|
|
}
|
|
|
|
dcm = dcm_addr[BOARD(tp->t_dev)];
|
|
port = PORT(tp->t_dev);
|
|
pp = dcm_preg(dcm, port);
|
|
tail = pp->t_tail & TX_MASK;
|
|
next = (tail + 1) & TX_MASK;
|
|
head = pp->t_head & TX_MASK;
|
|
if (head == next)
|
|
goto out;
|
|
fifo = &dcm->dcm_tfifos[3-port][tail];
|
|
again:
|
|
nch = q_to_b(&tp->t_outq, buf, (head - next) & TX_MASK);
|
|
#ifdef IOSTATS
|
|
tch += nch;
|
|
#endif
|
|
#ifdef DEBUG
|
|
if (dcmdebug & DDB_OUTPUT)
|
|
printf("\thead %x tail %x nch %d\n", head, tail, nch);
|
|
#endif
|
|
/*
|
|
* Loop transmitting all the characters we can.
|
|
*/
|
|
for (bp = buf; --nch >= 0; bp++) {
|
|
fifo->data_char = *bp;
|
|
pp->t_tail = next;
|
|
/*
|
|
* If this is the first character,
|
|
* get the hardware moving right now.
|
|
*/
|
|
if (bp == buf) {
|
|
tp->t_state |= TS_BUSY;
|
|
SEM_LOCK(dcm);
|
|
dcm->dcm_cmdtab[port].dcm_data |= CT_TX;
|
|
dcm->dcm_cr |= (1 << port);
|
|
SEM_UNLOCK(dcm);
|
|
}
|
|
tail = next;
|
|
fifo = tail ? fifo+1 : &dcm->dcm_tfifos[3-port][0];
|
|
next = (next + 1) & TX_MASK;
|
|
}
|
|
/*
|
|
* Head changed while we were loading the buffer,
|
|
* go back and load some more if we can.
|
|
*/
|
|
if (tp->t_outq.c_cc && head != (pp->t_head & TX_MASK)) {
|
|
#ifdef IOSTATS
|
|
dsp->xrestarts++;
|
|
#endif
|
|
head = pp->t_head & TX_MASK;
|
|
goto again;
|
|
}
|
|
|
|
/*
|
|
* Kick it one last time in case it finished while we were
|
|
* loading the last bunch.
|
|
*/
|
|
if (bp > &buf[1]) {
|
|
tp->t_state |= TS_BUSY;
|
|
SEM_LOCK(dcm);
|
|
dcm->dcm_cmdtab[port].dcm_data |= CT_TX;
|
|
dcm->dcm_cr |= (1 << port);
|
|
SEM_UNLOCK(dcm);
|
|
}
|
|
#ifdef DEBUG
|
|
if (dcmdebug & DDB_INTR)
|
|
printf("dcmstart(%d): head %x tail %x outqcc %d\n",
|
|
UNIT(tp->t_dev), head, tail, tp->t_outq.c_cc);
|
|
#endif
|
|
out:
|
|
#ifdef IOSTATS
|
|
dsp->xchars += tch;
|
|
if (tch <= DCMXBSIZE)
|
|
dsp->xsilo[tch]++;
|
|
else
|
|
dsp->xsilo[DCMXBSIZE+1]++;
|
|
#endif
|
|
splx(s);
|
|
}
|
|
|
|
/*
|
|
* Stop output on a line.
|
|
*/
|
|
dcmstop(tp, flag)
|
|
register struct tty *tp;
|
|
{
|
|
int s;
|
|
|
|
s = spltty();
|
|
if (tp->t_state & TS_BUSY) {
|
|
/* XXX is there some way to safely stop transmission? */
|
|
if ((tp->t_state&TS_TTSTOP) == 0)
|
|
tp->t_state |= TS_FLUSH;
|
|
}
|
|
splx(s);
|
|
}
|
|
|
|
/*
|
|
* Modem control
|
|
*/
|
|
dcmmctl(dev, bits, how)
|
|
dev_t dev;
|
|
int bits, how;
|
|
{
|
|
register struct dcmdevice *dcm;
|
|
int s, unit, brd, hit = 0;
|
|
|
|
unit = UNIT(dev);
|
|
#ifdef DEBUG
|
|
if (dcmdebug & DDB_MODEM)
|
|
printf("dcmmctl(%d) unit %d bits 0x%x how %x\n",
|
|
BOARD(unit), unit, bits, how);
|
|
#endif
|
|
|
|
brd = BOARD(unit);
|
|
dcm = dcm_addr[brd];
|
|
s = spltty();
|
|
switch (how) {
|
|
|
|
case DMSET:
|
|
dcm_modem[unit]->mdmout = bits;
|
|
hit++;
|
|
break;
|
|
|
|
case DMBIS:
|
|
dcm_modem[unit]->mdmout |= bits;
|
|
hit++;
|
|
break;
|
|
|
|
case DMBIC:
|
|
dcm_modem[unit]->mdmout &= ~bits;
|
|
hit++;
|
|
break;
|
|
|
|
case DMGET:
|
|
bits = dcm_modem[unit]->mdmin;
|
|
if (dcmsoftCAR[brd] & FLAG_STDDCE)
|
|
bits = hp2dce_in(bits);
|
|
break;
|
|
}
|
|
if (hit) {
|
|
SEM_LOCK(dcm);
|
|
dcm->dcm_modemchng |= 1<<(unit & 3);
|
|
dcm->dcm_cr |= CR_MODM;
|
|
SEM_UNLOCK(dcm);
|
|
DELAY(10); /* delay until done */
|
|
(void) splx(s);
|
|
}
|
|
return (bits);
|
|
}
|
|
|
|
/*
|
|
* Set board to either interrupt per-character or at a fixed interval.
|
|
*/
|
|
dcmsetischeme(brd, flags)
|
|
int brd, flags;
|
|
{
|
|
register struct dcmdevice *dcm = dcm_addr[brd];
|
|
register struct dcmischeme *dis = &dcmischeme[brd];
|
|
register int i;
|
|
u_char mask;
|
|
int perchar = flags & DIS_PERCHAR;
|
|
|
|
#ifdef DEBUG
|
|
if (dcmdebug & DDB_INTSCHM)
|
|
printf("dcmsetischeme(%d, %d): cur %d, ints %d, chars %d\n",
|
|
brd, perchar, dis->dis_perchar,
|
|
dis->dis_intr, dis->dis_char);
|
|
if ((flags & DIS_RESET) == 0 && perchar == dis->dis_perchar) {
|
|
printf("dcmsetischeme(%d): redundent request %d\n",
|
|
brd, perchar);
|
|
return;
|
|
}
|
|
#endif
|
|
/*
|
|
* If perchar is non-zero, we enable interrupts on all characters
|
|
* otherwise we disable perchar interrupts and use periodic
|
|
* polling interrupts.
|
|
*/
|
|
dis->dis_perchar = perchar;
|
|
mask = perchar ? 0xf : 0x0;
|
|
for (i = 0; i < 256; i++)
|
|
dcm->dcm_bmap[i].data_data = mask;
|
|
/*
|
|
* Don't slow down tandem mode, interrupt on flow control
|
|
* chars for any port on the board.
|
|
*/
|
|
if (!perchar) {
|
|
register struct tty *tp = dcm_tty[MKUNIT(brd, 0)];
|
|
int c;
|
|
|
|
for (i = 0; i < 4; i++, tp++) {
|
|
if ((c = tp->t_cc[VSTART]) != _POSIX_VDISABLE)
|
|
dcm->dcm_bmap[c].data_data |= (1 << i);
|
|
if ((c = tp->t_cc[VSTOP]) != _POSIX_VDISABLE)
|
|
dcm->dcm_bmap[c].data_data |= (1 << i);
|
|
}
|
|
}
|
|
/*
|
|
* Board starts with timer disabled so if first call is to
|
|
* set perchar mode then we don't want to toggle the timer.
|
|
*/
|
|
if (flags == (DIS_RESET|DIS_PERCHAR))
|
|
return;
|
|
/*
|
|
* Toggle card 16.7ms interrupts (we first make sure that card
|
|
* has cleared the bit so it will see the toggle).
|
|
*/
|
|
while (dcm->dcm_cr & CR_TIMER)
|
|
;
|
|
SEM_LOCK(dcm);
|
|
dcm->dcm_cr |= CR_TIMER;
|
|
SEM_UNLOCK(dcm);
|
|
}
|
|
|
|
/*
|
|
* Following are all routines needed for DCM to act as console
|
|
*/
|
|
#include "../hp300/cons.h"
|
|
|
|
dcmcnprobe(cp)
|
|
struct consdev *cp;
|
|
{
|
|
register struct hp_hw *hw;
|
|
int unit;
|
|
|
|
/* locate the major number */
|
|
for (dcmmajor = 0; dcmmajor < nchrdev; dcmmajor++)
|
|
if (cdevsw[dcmmajor].d_open == dcmopen)
|
|
break;
|
|
|
|
/*
|
|
* Implicitly assigns the lowest select code DCM card found to be
|
|
* logical unit 0 (actually CONUNIT). If your config file does
|
|
* anything different, you're screwed.
|
|
*/
|
|
for (hw = sc_table; hw->hw_type; hw++)
|
|
if (HW_ISDEV(hw, D_COMMDCM) && !badaddr((short *)hw->hw_kva))
|
|
break;
|
|
if (!HW_ISDEV(hw, D_COMMDCM)) {
|
|
cp->cn_pri = CN_DEAD;
|
|
return;
|
|
}
|
|
unit = CONUNIT;
|
|
dcm_addr[BOARD(CONUNIT)] = (struct dcmdevice *)hw->hw_kva;
|
|
|
|
/* initialize required fields */
|
|
cp->cn_dev = makedev(dcmmajor, unit);
|
|
switch (dcm_addr[BOARD(unit)]->dcm_rsid) {
|
|
case DCMID:
|
|
cp->cn_pri = CN_NORMAL;
|
|
break;
|
|
case DCMID|DCMCON:
|
|
cp->cn_pri = CN_REMOTE;
|
|
break;
|
|
default:
|
|
cp->cn_pri = CN_DEAD;
|
|
return;
|
|
}
|
|
/*
|
|
* If dcmconsole is initialized, raise our priority.
|
|
*/
|
|
if (dcmconsole == UNIT(unit))
|
|
cp->cn_pri = CN_REMOTE;
|
|
#ifdef KGDB_CHEAT
|
|
/*
|
|
* This doesn't currently work, at least not with ite consoles;
|
|
* the console hasn't been initialized yet.
|
|
*/
|
|
if (major(kgdb_dev) == dcmmajor && BOARD(kgdb_dev) == BOARD(unit)) {
|
|
(void) dcminit(kgdb_dev, kgdb_rate);
|
|
if (kgdb_debug_init) {
|
|
/*
|
|
* We assume that console is ready for us...
|
|
* this assumes that a dca or ite console
|
|
* has been selected already and will init
|
|
* on the first putc.
|
|
*/
|
|
printf("dcm%d: ", UNIT(kgdb_dev));
|
|
kgdb_connect(1);
|
|
}
|
|
}
|
|
#endif
|
|
}
|
|
|
|
dcmcninit(cp)
|
|
struct consdev *cp;
|
|
{
|
|
dcminit(cp->cn_dev, dcmdefaultrate);
|
|
dcmconsinit = 1;
|
|
dcmconsole = UNIT(cp->cn_dev);
|
|
}
|
|
|
|
dcminit(dev, rate)
|
|
dev_t dev;
|
|
int rate;
|
|
{
|
|
register struct dcmdevice *dcm = dcm_addr[BOARD(dev)];
|
|
int s, mode, port;
|
|
|
|
port = PORT(dev);
|
|
mode = LC_8BITS | LC_1STOP;
|
|
s = splhigh();
|
|
/*
|
|
* Wait for transmitter buffer to empty.
|
|
*/
|
|
while (dcm->dcm_thead[port].ptr != dcm->dcm_ttail[port].ptr)
|
|
DELAY(DCM_USPERCH(rate));
|
|
/*
|
|
* Make changes known to hardware.
|
|
*/
|
|
dcm->dcm_data[port].dcm_baud = ttspeedtab(rate, dcmspeedtab);
|
|
dcm->dcm_data[port].dcm_conf = mode;
|
|
SEM_LOCK(dcm);
|
|
dcm->dcm_cmdtab[port].dcm_data |= CT_CON;
|
|
dcm->dcm_cr |= (1 << port);
|
|
SEM_UNLOCK(dcm);
|
|
/*
|
|
* Delay for config change to take place. Weighted by baud.
|
|
* XXX why do we do this?
|
|
*/
|
|
DELAY(16 * DCM_USPERCH(rate));
|
|
splx(s);
|
|
}
|
|
|
|
dcmcngetc(dev)
|
|
dev_t dev;
|
|
{
|
|
register struct dcmdevice *dcm = dcm_addr[BOARD(dev)];
|
|
register struct dcmrfifo *fifo;
|
|
register struct dcmpreg *pp;
|
|
register unsigned head;
|
|
int s, c, stat, port;
|
|
|
|
port = PORT(dev);
|
|
pp = dcm_preg(dcm, port);
|
|
s = splhigh();
|
|
head = pp->r_head & RX_MASK;
|
|
fifo = &dcm->dcm_rfifos[3-port][head>>1];
|
|
while (head == (pp->r_tail & RX_MASK))
|
|
;
|
|
/*
|
|
* If board interrupts are enabled, just let our received char
|
|
* interrupt through in case some other port on the board was
|
|
* busy. Otherwise we must clear the interrupt.
|
|
*/
|
|
SEM_LOCK(dcm);
|
|
if ((dcm->dcm_ic & IC_IE) == 0)
|
|
stat = dcm->dcm_iir;
|
|
SEM_UNLOCK(dcm);
|
|
c = fifo->data_char;
|
|
stat = fifo->data_stat;
|
|
pp->r_head = (head + 2) & RX_MASK;
|
|
splx(s);
|
|
return (c);
|
|
}
|
|
|
|
/*
|
|
* Console kernel output character routine.
|
|
*/
|
|
dcmcnputc(dev, c)
|
|
dev_t dev;
|
|
int c;
|
|
{
|
|
register struct dcmdevice *dcm = dcm_addr[BOARD(dev)];
|
|
register struct dcmpreg *pp;
|
|
unsigned tail;
|
|
int s, port, stat;
|
|
|
|
port = PORT(dev);
|
|
pp = dcm_preg(dcm, port);
|
|
s = splhigh();
|
|
#ifdef KGDB
|
|
if (dev != kgdb_dev)
|
|
#endif
|
|
if (dcmconsinit == 0) {
|
|
(void) dcminit(dev, dcmdefaultrate);
|
|
dcmconsinit = 1;
|
|
}
|
|
tail = pp->t_tail & TX_MASK;
|
|
while (tail != (pp->t_head & TX_MASK))
|
|
;
|
|
dcm->dcm_tfifos[3-port][tail].data_char = c;
|
|
pp->t_tail = tail = (tail + 1) & TX_MASK;
|
|
SEM_LOCK(dcm);
|
|
dcm->dcm_cmdtab[port].dcm_data |= CT_TX;
|
|
dcm->dcm_cr |= (1 << port);
|
|
SEM_UNLOCK(dcm);
|
|
while (tail != (pp->t_head & TX_MASK))
|
|
;
|
|
/*
|
|
* If board interrupts are enabled, just let our completion
|
|
* interrupt through in case some other port on the board
|
|
* was busy. Otherwise we must clear the interrupt.
|
|
*/
|
|
if ((dcm->dcm_ic & IC_IE) == 0) {
|
|
SEM_LOCK(dcm);
|
|
stat = dcm->dcm_iir;
|
|
SEM_UNLOCK(dcm);
|
|
}
|
|
splx(s);
|
|
}
|
|
#endif
|