dcm.c

早期freebsd实现

/*
 * Copyright (c) 1988 University of Utah.
 * Copyright (c) 1982, 1986, 1990, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * the Systems Programming Group of the University of Utah Computer
 * Science Department.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * from Utah: $Hdr: dcm.c 1.29 92/01/21$
 *
 *	@(#)dcm.c	8.4 (Berkeley) 1/12/94
 */

/*
 * TODO:
 *	Timeouts
 *	Test console support.
 */

#include "dcm.h"
#if NDCM > 0
/*
 *  98642/MUX
 */
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/ioctl.h>
#include <sys/proc.h>
#include <sys/tty.h>
#include <sys/conf.h>
#include <sys/file.h>
#include <sys/uio.h>
#include <sys/kernel.h>
#include <sys/syslog.h>
#include <sys/time.h>

#include <hp/dev/device.h>

#include <hp300/dev/dcmreg.h>
#include <machine/cpu.h>
#include <hp300/hp300/isr.h>

#ifndef DEFAULT_BAUD_RATE
#define DEFAULT_BAUD_RATE 9600
#endif

int	dcmprobe(), dcmintr(), dcmparam();
void	dcmstart();
struct	driver dcmdriver = {
	dcmprobe, "dcm",
};

#define NDCMLINE (NDCM*4)

struct	tty dcm_tty[NDCMLINE];
struct	modemreg *dcm_modem[NDCMLINE];
char	mcndlast[NDCMLINE];	/* XXX last modem status for line */
int	ndcm = NDCMLINE;

int	dcm_active;
int	dcmsoftCAR[NDCM];
struct	dcmdevice *dcm_addr[NDCM];
struct	isr dcmisr[NDCM];

struct speedtab dcmspeedtab[] = {
	0,	BR_0,
	50,	BR_50,
	75,	BR_75,
	110,	BR_110,
	134,	BR_134,
	150,	BR_150,
	300,	BR_300,
	600,	BR_600,
	1200,	BR_1200,
	1800,	BR_1800,
	2400,	BR_2400,
	4800,	BR_4800,
	9600,	BR_9600,
	19200,	BR_19200,
	38400,	BR_38400,
	-1,	-1
};

/* u-sec per character based on baudrate (assumes 1 start/8 data/1 stop bit) */
#define	DCM_USPERCH(s)	(10000000 / (s))

/*
 * Per board interrupt scheme.  16.7ms is the polling interrupt rate
 * (16.7ms is about 550 baud, 38.4k is 72 chars in 16.7ms).
 */
#define DIS_TIMER	0
#define DIS_PERCHAR	1
#define DIS_RESET	2

int	dcmistype = -1;		/* -1 == dynamic, 0 == timer, 1 == perchar */
int     dcminterval = 5;	/* interval (secs) between checks */
struct	dcmischeme {
	int	dis_perchar;	/* non-zero if interrupting per char */
	long	dis_time;	/* last time examined */
	int	dis_intr;	/* recv interrupts during last interval */
	int	dis_char;	/* characters read during last interval */
} dcmischeme[NDCM];

/*
 * Console support
 */
#ifdef DCMCONSOLE
int	dcmconsole = DCMCONSOLE;
#else
int	dcmconsole = -1;
#endif
int	dcmconsinit;
int	dcmdefaultrate = DEFAULT_BAUD_RATE;
int	dcmconbrdbusy = 0;
int	dcmmajor;
extern	struct tty *constty;

#ifdef KGDB
/*
 * Kernel GDB support
 */
#include <machine/remote-sl.h>

extern dev_t kgdb_dev;
extern int kgdb_rate;
extern int kgdb_debug_init;
#endif

/* #define DCMSTATS */

#ifdef DEBUG
int	dcmdebug = 0x0;
#define DDB_SIOERR	0x01
#define DDB_PARAM	0x02
#define DDB_INPUT	0x04
#define DDB_OUTPUT	0x08
#define DDB_INTR	0x10
#define DDB_IOCTL	0x20
#define DDB_INTSCHM	0x40
#define DDB_MODEM	0x80
#define DDB_OPENCLOSE	0x100
#endif

#ifdef DCMSTATS
#define	DCMRBSIZE	94
#define DCMXBSIZE	24

struct	dcmstats {
	long	xints;		    /* # of xmit ints */
	long	xchars;		    /* # of xmit chars */
	long	xempty;		    /* times outq is empty in dcmstart */
	long	xrestarts;	    /* times completed while xmitting */
	long	rints;		    /* # of recv ints */
	long	rchars;		    /* # of recv chars */
	long	xsilo[DCMXBSIZE+2]; /* times this many chars xmit on one int */
	long	rsilo[DCMRBSIZE+2]; /* times this many chars read on one int */
} dcmstats[NDCM];
#endif

#define UNIT(x)		minor(x)
#define	BOARD(x)	(((x) >> 2) & 0x3f)
#define PORT(x)		((x) & 3)
#define MKUNIT(b,p)	(((b) << 2) | (p))

/*
 * Conversion from "HP DCE" to almost-normal DCE: on the 638 8-port mux,
 * the distribution panel uses "HP DCE" conventions.  If requested via
 * the device flags, we swap the inputs to something closer to normal DCE,
 * allowing a straight-through cable to a DTE or a reversed cable
 * to a DCE (reversing 2-3, 4-5, 8-20 and leaving 6 unconnected;
 * this gets "DCD" on pin 20 and "CTS" on 4, but doesn't connect
 * DSR or make RTS work, though).  The following gives the full
 * details of a cable from this mux panel to a modem:
 *
 *		     HP		    modem
 *		name	pin	pin	name
 * HP inputs:
 *		"Rx"	 2	 3	Tx
 *		CTS	 4	 5	CTS	(only needed for CCTS_OFLOW)
 *		DCD	20	 8	DCD
 *		"DSR"	 9	 6	DSR	(unneeded)
 *		RI	22	22	RI	(unneeded)
 *
 * HP outputs:
 *		"Tx"	 3	 2	Rx
 *		"DTR"	 6	not connected
 *		"RTS"	 8	20	DTR
 *		"SR"	23	 4	RTS	(often not needed)
 */
#define	FLAG_STDDCE	0x10	/* map inputs if this bit is set in flags */
#define hp2dce_in(ibits)	(iconv[(ibits) & 0xf])
static char iconv[16] = {
	0,		MI_DM,		MI_CTS,		MI_CTS|MI_DM,
	MI_CD,		MI_CD|MI_DM,	MI_CD|MI_CTS,	MI_CD|MI_CTS|MI_DM,
	MI_RI,		MI_RI|MI_DM,	MI_RI|MI_CTS,	MI_RI|MI_CTS|MI_DM,
	MI_RI|MI_CD,	MI_RI|MI_CD|MI_DM, MI_RI|MI_CD|MI_CTS,
	MI_RI|MI_CD|MI_CTS|MI_DM
};

dcmprobe(hd)
	register struct hp_device *hd;
{
	register struct dcmdevice *dcm;
	register int i;
	register int timo = 0;
	int s, brd, isconsole, mbits;

	dcm = (struct dcmdevice *)hd->hp_addr;
	if ((dcm->dcm_rsid & 0x1f) != DCMID)
		return (0);
	brd = hd->hp_unit;
	isconsole = (brd == BOARD(dcmconsole));
	/*
	 * XXX selected console device (CONSUNIT) as determined by
	 * dcmcnprobe does not agree with logical numbering imposed
	 * by the config file (i.e. lowest address DCM is not unit
	 * CONSUNIT).  Don't recognize this card.
	 */
	if (isconsole && dcm != dcm_addr[BOARD(dcmconsole)])
		return (0);

	/*
	 * Empirically derived self-test magic
	 */
	s = spltty();
	dcm->dcm_rsid = DCMRS;
	DELAY(50000);	/* 5000 is not long enough */
	dcm->dcm_rsid = 0; 
	dcm->dcm_ic = IC_IE;
	dcm->dcm_cr = CR_SELFT;
	while ((dcm->dcm_ic & IC_IR) == 0)
		if (++timo == 20000)
			return (0);
	DELAY(50000)	/* XXX why is this needed ???? */
	while ((dcm->dcm_iir & IIR_SELFT) == 0)
		if (++timo == 400000)
			return (0);
	DELAY(50000)	/* XXX why is this needed ???? */
	if (dcm->dcm_stcon != ST_OK) {
		if (!isconsole)
			printf("dcm%d: self test failed: %x\n",
			       brd, dcm->dcm_stcon);
		return (0);
	}
	dcm->dcm_ic = IC_ID;
	splx(s);

	hd->hp_ipl = DCMIPL(dcm->dcm_ic);
	dcm_addr[brd] = dcm;
	dcm_active |= 1 << brd;
	dcmsoftCAR[brd] = hd->hp_flags;
	dcmisr[brd].isr_ipl = hd->hp_ipl;
	dcmisr[brd].isr_arg = brd;
	dcmisr[brd].isr_intr = dcmintr;
	isrlink(&dcmisr[brd]);
#ifdef KGDB
	if (major(kgdb_dev) == dcmmajor && BOARD(kgdb_dev) == brd) {
		if (dcmconsole == UNIT(kgdb_dev))
			kgdb_dev = NODEV; /* can't debug over console port */
#ifndef KGDB_CHEAT
		/*
		 * The following could potentially be replaced
		 * by the corresponding code in dcmcnprobe.
		 */
		else {
			(void) dcminit(kgdb_dev, kgdb_rate);
			if (kgdb_debug_init) {
				printf("dcm%d: ", UNIT(kgdb_dev));
				kgdb_connect(1);
			} else
				printf("dcm%d: kgdb enabled\n", UNIT(kgdb_dev));
		}
		/* end could be replaced */
#endif
	}
#endif
	if (dcmistype == DIS_TIMER)
		dcmsetischeme(brd, DIS_RESET|DIS_TIMER);
	else
		dcmsetischeme(brd, DIS_RESET|DIS_PERCHAR);

	/* load pointers to modem control */
	dcm_modem[MKUNIT(brd, 0)] = &dcm->dcm_modem0;
	dcm_modem[MKUNIT(brd, 1)] = &dcm->dcm_modem1;
	dcm_modem[MKUNIT(brd, 2)] = &dcm->dcm_modem2;
	dcm_modem[MKUNIT(brd, 3)] = &dcm->dcm_modem3;
	/* set DCD (modem) and CTS (flow control) on all ports */
	if (dcmsoftCAR[brd] & FLAG_STDDCE)
		mbits = hp2dce_in(MI_CD|MI_CTS);
	else
		mbits = MI_CD|MI_CTS;
	for (i = 0; i < 4; i++)
		dcm_modem[MKUNIT(brd, i)]->mdmmsk = mbits;

	dcm->dcm_ic = IC_IE;		/* turn all interrupts on */
	/*
	 * Need to reset baud rate, etc. of next print so reset dcmconsole.
	 * Also make sure console is always "hardwired"
	 */
	if (isconsole) {
		dcmconsinit = 0;
		dcmsoftCAR[brd] |= (1 << PORT(dcmconsole));
	}
	return (1);
}

/* ARGSUSED */
#ifdef __STDC__
dcmopen(dev_t dev, int flag, int mode, struct proc *p)
#else
dcmopen(dev, flag, mode, p)
	dev_t dev;
	int flag, mode;
	struct proc *p;
#endif
{
	register struct tty *tp;
	register int unit, brd;
	int error = 0, mbits;

	unit = UNIT(dev);
	brd = BOARD(unit);
	if (unit >= NDCMLINE || (dcm_active & (1 << brd)) == 0)
		return (ENXIO);
	tp = &dcm_tty[unit];
	tp->t_oproc = dcmstart;
	tp->t_param = dcmparam;
	tp->t_dev = dev;
	if ((tp->t_state & TS_ISOPEN) == 0) {
		tp->t_state |= TS_WOPEN;
		ttychars(tp);
		if (tp->t_ispeed == 0) {
			tp->t_iflag = TTYDEF_IFLAG;
			tp->t_oflag = TTYDEF_OFLAG;
			tp->t_cflag = TTYDEF_CFLAG;
			tp->t_lflag = TTYDEF_LFLAG;
			tp->t_ispeed = tp->t_ospeed = TTYDEF_SPEED;
		}
		(void) dcmparam(tp, &tp->t_termios);
		ttsetwater(tp);
	} else if (tp->t_state&TS_XCLUDE && p->p_ucred->cr_uid != 0)
		return (EBUSY);
	mbits = MO_ON;
	if (dcmsoftCAR[brd] & FLAG_STDDCE)
		mbits |= MO_SR;		/* pin 23, could be used as RTS */
	(void) dcmmctl(dev, mbits, DMSET);	/* enable port */
	if ((dcmsoftCAR[brd] & (1 << PORT(unit))) ||
	    (dcmmctl(dev, MO_OFF, DMGET) & MI_CD))
		tp->t_state |= TS_CARR_ON;
#ifdef DEBUG
	if (dcmdebug & DDB_MODEM)
		printf("dcm%d: dcmopen port %d softcarr %c\n",
		       brd, unit, (tp->t_state & TS_CARR_ON) ? '1' : '0');
#endif
	(void) spltty();
	while ((flag&O_NONBLOCK) == 0 && (tp->t_cflag&CLOCAL) == 0 &&
	    (tp->t_state & TS_CARR_ON) == 0) {
		tp->t_state |= TS_WOPEN;
		if (error = ttysleep(tp, (caddr_t)&tp->t_rawq, TTIPRI | PCATCH,
		    ttopen, 0))
			break;
	}
	(void) spl0();

#ifdef DEBUG
	if (dcmdebug & DDB_OPENCLOSE)
		printf("dcmopen: u %x st %x fl %x\n",
			unit, tp->t_state, tp->t_flags);
#endif
	if (error == 0)
		error = (*linesw[tp->t_line].l_open)(dev, tp);
	return (error);
}
 
/*ARGSUSED*/
dcmclose(dev, flag, mode, p)
	dev_t dev;
	int flag, mode;
	struct proc *p;
{
	register struct tty *tp;
	int unit;
 
	unit = UNIT(dev);
	tp = &dcm_tty[unit];
	(*linesw[tp->t_line].l_close)(tp, flag);
	if (tp->t_cflag&HUPCL || tp->t_state&TS_WOPEN ||
	    (tp->t_state&TS_ISOPEN) == 0)
		(void) dcmmctl(dev, MO_OFF, DMSET);
#ifdef DEBUG
	if (dcmdebug & DDB_OPENCLOSE)
		printf("dcmclose: u %x st %x fl %x\n",
			unit, tp->t_state, tp->t_flags);
#endif
	ttyclose(tp);
	return (0);
}
 
dcmread(dev, uio, flag)
	dev_t dev;
	struct uio *uio;
	int flag;
{
	register struct tty *tp;
 
	tp = &dcm_tty[UNIT(dev)];
	return ((*linesw[tp->t_line].l_read)(tp, uio, flag));
}
 
dcmwrite(dev, uio, flag)
	dev_t dev;
	struct uio *uio;
	int flag;