451 lines
12 KiB
C++
451 lines
12 KiB
C++
/*
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* Copyright (c) 1990 William F. Jolitz, TeleMuse
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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. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This software is a component of "386BSD" developed by
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* William F. Jolitz, TeleMuse.
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* 4. Neither the name of the developer nor the name "386BSD"
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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 A COMPONENT OF 386BSD DEVELOPED BY WILLIAM F. JOLITZ
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* AND IS INTENDED FOR RESEARCH AND EDUCATIONAL PURPOSES ONLY. THIS
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* SOFTWARE SHOULD NOT BE CONSIDERED TO BE A COMMERCIAL PRODUCT.
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* THE DEVELOPER URGES THAT USERS WHO REQUIRE A COMMERCIAL PRODUCT
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* NOT MAKE USE OF THIS WORK.
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*
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* FOR USERS WHO WISH TO UNDERSTAND THE 386BSD SYSTEM DEVELOPED
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* BY WILLIAM F. JOLITZ, WE RECOMMEND THE USER STUDY WRITTEN
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* REFERENCES SUCH AS THE "PORTING UNIX TO THE 386" SERIES
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* (BEGINNING JANUARY 1991 "DR. DOBBS JOURNAL", USA AND BEGINNING
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* JUNE 1991 "UNIX MAGAZIN", GERMANY) BY WILLIAM F. JOLITZ AND
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* LYNNE GREER JOLITZ, AS WELL AS OTHER BOOKS ON UNIX AND THE
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* ON-LINE 386BSD USER MANUAL BEFORE USE. A BOOK DISCUSSING THE INTERNALS
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* OF 386BSD ENTITLED "386BSD FROM THE INSIDE OUT" WILL BE AVAILABLE LATE 1992.
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*
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* THIS SOFTWARE IS PROVIDED BY THE DEVELOPER ``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 DEVELOPER 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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* $Id: lptvar.h,v 1.6 1993/06/15 01:50:32 mycroft Exp $
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*/
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/*
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* Device Driver for AT parallel printer port
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* Written by William Jolitz 12/18/90
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*
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* Hacked heavily by Rod Grimes and Eric Haug...
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*/
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#include "lpt.h"
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#if NLPT > 0
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#include "param.h"
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#include "systm.h"
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#include "proc.h"
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#include "user.h"
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#include "buf.h"
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#include "kernel.h"
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#include "ioctl.h"
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#include "tty.h"
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#include "uio.h"
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#include "i386/isa/isa.h"
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#include "i386/isa/isa_device.h"
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#include "i386/isa/lptreg.h"
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#define LPINITRDY 4 /* wait up to 4 seconds for a ready */
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#define LPTOUTTIME 4 /* wait up to 4 seconds for a ready */
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#define LPPRI (PZERO+8)
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#define BUFSIZE 1024
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#ifndef DEBUG
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#define lprintf
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#else
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#define lprintf if (lptflag) printf
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int lptflag = 1;
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#endif
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int lptout();
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#ifdef DEBUG
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int lptflag = 1;
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#endif
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int lptprobe(), lptattach(), lptintr();
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struct isa_driver lptdriver = {
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lptprobe, lptattach, "lpt"
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};
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#define LPTUNIT(s) (((s)>>6)&0x3)
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#define LPTFLAGS(s) ((s)&0x3f)
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struct lpt_softc {
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short sc_port;
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short sc_state;
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/* default case: negative prime, negative ack, handshake strobe,
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prime once */
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u_char sc_control;
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char sc_flags;
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#define LP_POS_INIT 0x01 /* if we are a postive init signal */
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#define LP_POS_ACK 0x02 /* if we are a positive going ack */
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#define LP_NO_PRIME 0x04 /* don't prime the printer at all */
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#define LP_PRIMEOPEN 0x08 /* prime on every open */
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#define LP_AUTOLF 0x10 /* tell printer to do an automatic lf */
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#define LP_BYPASS 0x20 /* bypass printer ready checks */
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struct buf *sc_inbuf;
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short sc_xfercnt ;
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char sc_primed;
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char *sc_cp ;
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} lpt_sc[NLPT] ;
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/* bits for state */
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#define OPEN (1<<0) /* device is open */
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#define ASLP (1<<1) /* awaiting draining of printer */
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#define ERROR (1<<2) /* error was received from printer */
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#define OBUSY (1<<3) /* printer is busy doing output */
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#define LPTOUT (1<<4) /* timeout while not selected */
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#define TOUT (1<<5) /* timeout while not selected */
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#define INIT (1<<6) /* waiting to initialize for open */
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/*
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* Internal routine to lptprobe to do port tests of one byte value
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*/
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int
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lpt_port_test(short port, u_char data, u_char mask)
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{
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int temp, timeout;
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data = data & mask;
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outb(port, data);
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timeout = 100;
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do
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temp = inb(port) & mask;
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while (temp != data && --timeout);
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lprintf("Port 0x%x\tout=%x\tin=%x\n", port, data, temp);
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return (temp == data);
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}
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/*
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* New lptprobe routine written by Rodney W. Grimes, 3/25/1993
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*
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* Logic:
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* 1) You should be able to write to and read back the same value
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* to the data port. Do an alternating zeros, alternating ones,
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* walking zero, and walking one test to check for stuck bits.
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*
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* 2) You should be able to write to and read back the same value
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* to the control port lower 5 bits, the upper 3 bits are reserved
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* per the IBM PC technical reference manauls and different boards
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* do different things with them. Do an alternating zeros, alternating
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* ones, walking zero, and walking one test to check for stuck bits.
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*
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* Some printers drag the strobe line down when the are powered off
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* so this bit has been masked out of the control port test.
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*
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* XXX Some printers may not like a fast pulse on init or strobe, I
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* don't know at this point, if that becomes a problem these bits
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* should be turned off in the mask byte for the control port test.
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*
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* 3) Set the data and control ports to a value of 0
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*/
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int
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lptprobe(struct isa_device *dvp)
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{
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int status;
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short port;
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u_char data;
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u_char mask;
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int i;
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status = IO_LPTSIZE;
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port = dvp->id_iobase + lpt_data;
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mask = 0xff;
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while (mask != 0)
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{
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data = 0x55; /* Alternating zeros */
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if (!lpt_port_test(port, data, mask)) status = 0;
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data = 0xaa; /* Alternating ones */
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if (!lpt_port_test(port, data, mask)) status = 0;
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for (i = 0; i < 8; i++) /* Walking zero */
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{
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data = ~(1 << i);
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if (!lpt_port_test(port, data, mask)) status = 0;
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}
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for (i = 0; i < 8; i++) /* Walking one */
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{
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data = (1 << i);
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if (!lpt_port_test(port, data, mask)) status = 0;
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}
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if (port == dvp->id_iobase + lpt_data)
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{
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port = dvp->id_iobase + lpt_control;
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mask = 0x1e;
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}
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else
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mask = 0;
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}
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outb(dvp->id_iobase+lpt_data, 0);
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outb(dvp->id_iobase+lpt_control, 0);
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return (status);
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}
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lptattach(isdp)
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struct isa_device *isdp;
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{
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struct lpt_softc *sc;
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sc = lpt_sc + isdp->id_unit;
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sc->sc_port = isdp->id_iobase;
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sc->sc_state = 0;
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outb(sc->sc_port+lpt_control, LPC_NINIT);
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return (1);
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}
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/*
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* lptopen -- reset the printer, then wait until it's selected and not busy.
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*/
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lptopen(dev, flag)
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dev_t dev;
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int flag;
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{
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struct lpt_softc *sc = lpt_sc + LPTUNIT(minor(dev));
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int s;
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int trys, port;
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if (sc->sc_state) {
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lprintf("lp: still open\n") ;
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printf("still open %x\n", sc->sc_state);
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return(EBUSY);
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} else sc->sc_state |= INIT;
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s = spltty();
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sc->sc_flags = LPTFLAGS(minor(dev));
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lprintf("lp flags 0x%x\n", sc->sc_flags);
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port = sc->sc_port;
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/* init printer */
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if((sc->sc_flags & LP_NO_PRIME) == 0) {
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if((sc->sc_flags & LP_PRIMEOPEN) || sc->sc_primed == 0) {
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outb(port+lpt_control, 0);
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sc->sc_primed++;
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DELAY(500);
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}
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}
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outb(port+lpt_control, LPC_SEL|LPC_NINIT);
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/* wait till ready (printer running diagnostics) */
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trys = 0;
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do {
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/* ran out of waiting for the printer */
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if (trys++ >= LPINITRDY*4) {
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splx(s);
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sc->sc_state = 0;
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printf ("status %x\n", inb(port+lpt_status) );
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return (EBUSY);
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}
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/* wait 1/4 second, give up if we get a signal */
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if (tsleep (sc, LPPRI|PCATCH, "lptinit", hz/4) != EWOULDBLOCK) {
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sc->sc_state = 0;
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splx(s);
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return (EBUSY);
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}
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/* is printer online and ready for output */
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} while ((inb(port+lpt_status) & (LPS_SEL|LPS_OUT|LPS_NBSY|LPS_NERR)) !=
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(LPS_SEL|LPS_NBSY|LPS_NERR));
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if(sc->sc_flags&LP_AUTOLF) {
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outb(port+lpt_control, LPC_SEL|LPC_NINIT|LPC_ENA|LPC_AUTOL);
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sc->sc_control = LPC_SEL|LPC_NINIT|LPC_ENA|LPC_AUTOL;
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} else {
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outb(port+lpt_control, LPC_SEL|LPC_NINIT|LPC_ENA);
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sc->sc_control = LPC_SEL|LPC_NINIT|LPC_ENA;
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}
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sc->sc_state = OPEN | TOUT;
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sc->sc_inbuf = geteblk(BUFSIZE);
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sc->sc_xfercnt = 0;
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splx(s);
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timeout (lptout, sc, hz/2);
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lprintf("opened.\n");
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return(0);
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}
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lptout (sc)
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struct lpt_softc *sc;
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{ int pl;
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lprintf ("T %x ", inb(sc->sc_port+lpt_status));
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if (sc->sc_state&OPEN)
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timeout (lptout, sc, hz/2);
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else sc->sc_state &= ~TOUT;
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if (sc->sc_state & ERROR)
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sc->sc_state &= ~ERROR;
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/*
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* Avoid possible hangs do to missed interrupts
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*/
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if (sc->sc_xfercnt) {
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pl = spltty();
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lptintr(sc - lpt_sc);
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splx(pl);
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} else {
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sc->sc_state &= ~OBUSY;
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wakeup((caddr_t)sc);
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}
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}
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/*
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* lptclose -- close the device, free the local line buffer.
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*/
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lptclose(dev, flag)
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int flag;
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{
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struct lpt_softc *sc = lpt_sc + LPTUNIT(minor(dev));
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int port = sc->sc_port;
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sc->sc_state &= ~OPEN;
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while ((inb(port+lpt_status) & (LPS_SEL|LPS_OUT|LPS_NBSY|LPS_NERR)) !=
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(LPS_SEL|LPS_NBSY|LPS_NERR) || sc->sc_xfercnt)
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/* wait 1/4 second, give up if we get a signal */
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if (tsleep (sc, LPPRI|PCATCH, "lpclose", hz) != EWOULDBLOCK)
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break;
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sc->sc_state = 0;
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sc->sc_xfercnt = 0;
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outb(sc->sc_port+lpt_control, LPC_NINIT);
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brelse(sc->sc_inbuf);
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lprintf("closed.\n");
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return(0);
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}
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/*
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* lptwrite --copy a line from user space to a local buffer, then call
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* putc to get the chars moved to the output queue.
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*/
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lptwrite(dev, uio)
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dev_t dev;
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struct uio *uio;
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{
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register unsigned n;
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int pl, err;
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struct lpt_softc *sc = lpt_sc + LPTUNIT(minor(dev));
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while (n = MIN(BUFSIZE, uio->uio_resid)) {
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sc->sc_cp = sc->sc_inbuf->b_un.b_addr ;
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uiomove(sc->sc_cp, n, uio);
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sc->sc_xfercnt = n ;
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while (sc->sc_xfercnt > 0) {
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/* if the printer is ready for a char, give it one */
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if ((sc->sc_state & OBUSY) == 0){
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lprintf("\nC %d. ", sc->sc_xfercnt);
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pl = spltty();
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lptintr(sc - lpt_sc);
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(void) splx(pl);
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}
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lprintf("W ");
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if (err = tsleep (sc, LPPRI|PCATCH, "lpwrite", 0))
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return(err);
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}
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}
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return(0);
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}
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/*
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* lptintr -- handle printer interrupts which occur when the printer is
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* ready to accept another char.
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*/
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lptintr(unit)
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{
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struct lpt_softc *sc = lpt_sc + unit;
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int port = sc->sc_port,sts;
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sts = inb(port+lpt_status);
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if (!sc->sc_state) {
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printf ("lpt%d: stray interrupt sts=0x%02x\n", unit, sts);
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return;
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}
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/* is printer online and ready for output */
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if ((sts & (LPS_SEL|LPS_OUT|LPS_NBSY|LPS_NERR/*|LPS_NACK*/)) ==
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(LPS_SEL|LPS_NBSY|LPS_NERR)) {
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/* is this a false interrupt ? */
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if ((sc->sc_state & OBUSY)
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&& (sts & LPS_NACK) == 0) return;
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sc->sc_state |= OBUSY; sc->sc_state &= ~ERROR;
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if (sc->sc_xfercnt) {
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/* send char */
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/*lprintf("%x ", *sc->sc_cp); */
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outb(port+lpt_data, *sc->sc_cp++) ; sc->sc_xfercnt-- ;
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outb(port+lpt_control, sc->sc_control|LPC_STB);
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/* DELAY(X) */
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outb(port+lpt_control, sc->sc_control);
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}
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/* any more bytes for the printer? */
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if (sc->sc_xfercnt > 0) return;
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/* none, wake up the top half to get more */
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sc->sc_state &= ~OBUSY;
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wakeup((caddr_t)sc);
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lprintf("w ");
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return;
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} else sc->sc_state |= ERROR;
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lprintf("sts %x ", sts);
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}
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int
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lptioctl(dev_t dev, int cmd, caddr_t data, int flag)
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{
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int error;
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error = 0;
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switch (cmd) {
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#ifdef THISISASAMPLE
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case XXX:
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dothis; andthis; andthat;
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error=x;
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break;
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#endif /* THISISASAMPLE */
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default:
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error = ENODEV;
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}
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return(error);
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}
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#endif /* NLPT */
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