634 lines
16 KiB
C
634 lines
16 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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* from: unknown origin, 386BSD 0.1
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* $Id: lpt.c,v 1.8 1994/02/17 10:20:18 rgrimes 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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#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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/* BIOS printer list - used by BIOS probe*/
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#define BIOS_LPT_PORTS 0x408
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#define BIOS_PORTS (short *)(KERNBASE+BIOS_LPT_PORTS)
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#define BIOS_MAX_LPT 4
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#ifndef DEBUG
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#define lprintf (void)
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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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void lptout();
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int lptprobe(), lptattach();
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void 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)&0x03)
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#define LPTFLAGS(s) ((s)&0xfc)
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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 0x04 /* if we are a postive init signal */
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#define LP_POS_ACK 0x08 /* if we are a positive going ack */
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#define LP_NO_PRIME 0x10 /* don't prime the printer at all */
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#define LP_PRIMEOPEN 0x20 /* prime on every open */
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#define LP_AUTOLF 0x40 /* tell printer to do an automatic lf */
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#define LP_BYPASS 0x80 /* 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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u_char sc_irq ; /* IRQ status of port */
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#define LP_HAS_IRQ 0x01 /* we have an irq available */
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#define LP_USE_IRQ 0x02 /* we are using our irq */
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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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#define INTERRUPTED (1<<7) /* write call was interrupted */
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/* status masks to interrogate printer status */
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#define RDY_MASK (LPS_SEL|LPS_OUT|LPS_NBSY|LPS_NERR) /* ready ? */
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#define LP_READY (LPS_SEL|LPS_NBSY|LPS_NERR)
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/* Printer Ready condition - from lpa.c */
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/* Only used in polling code */
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#define LPS_INVERT (LPS_NBSY | LPS_NACK | LPS_SEL | LPS_NERR)
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#define LPS_MASK (LPS_NBSY | LPS_NACK | LPS_OUT | LPS_SEL | LPS_NERR)
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#define NOT_READY(x) ((inb(x)^LPS_INVERT)&LPS_MASK)
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#define MAX_SLEEP (hz*5) /* Timeout while waiting for device ready */
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#define MAX_SPIN 20 /* Max delay for device ready in usecs */
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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 = 10000;
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do {
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DELAY(10);
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temp = inb(port) & mask;
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}
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while (temp != data && --timeout);
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lprintf("Port 0x%x\tout=%x\tin=%x\ttout=%d\n",
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port, data, temp, timeout);
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return (temp == data);
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}
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/*
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* New lpt port probe Geoff Rehmet - Rhodes University - 14/2/94
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* Based partially on Rod Grimes' printer probe
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*
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* Logic:
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* 1) If no port address was given, use the bios detected ports
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* and autodetect what ports the printers are on.
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* 2) Otherwise, probe the data port at the address given,
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* using the method in Rod Grimes' port probe.
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* (Much code ripped off directly from Rod's probe.)
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*
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* Comments from Rod's probe:
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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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* We are finally left with a mask of 0x14, due to some printers
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* being adamant about holding other bits high ........
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*
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* Before probing the control port, we write a 0 to the data port -
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* If not, some printers chuck out garbage when the strobe line
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* gets toggled.
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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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* This probe routine has been tested on Epson Lx-800, HP LJ3P,
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* Epson FX-1170 and C.Itoh 8510RM
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* printers.
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* Quick exit on fail added.
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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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short port;
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static short next_bios_lpt = 0;
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int status;
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u_char data;
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u_char mask;
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int i;
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/*
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* Make sure there is some way for lptopen to see that
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* the port is not configured
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* This 0 will remain if the port isn't attached
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*/
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(lpt_sc + dvp->id_unit)->sc_port = 0;
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status = IO_LPTSIZE;
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/* If port not specified, use bios list */
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if(dvp->id_iobase < 0) { /* port? */
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if((next_bios_lpt < BIOS_MAX_LPT) &&
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(*(BIOS_PORTS+next_bios_lpt) != 0) ) {
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dvp->id_iobase = *(BIOS_PORTS+next_bios_lpt++);
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goto end_probe;
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} else
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return (0);
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}
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/* Port was explicitly specified */
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/* This allows probing of ports unknown to the BIOS */
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port = dvp->id_iobase + lpt_data;
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mask = 0xff;
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data = 0x55; /* Alternating zeros */
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if (!lpt_port_test(port, data, mask))
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{ status = 0 ; goto end_probe ; }
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data = 0xaa; /* Alternating ones */
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if (!lpt_port_test(port, data, mask))
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{ status = 0 ; goto end_probe ; }
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for (i = 0; i < 8; i++) { /* Walking zero */
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data = ~(1 << i);
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if (!lpt_port_test(port, data, mask))
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{ status = 0 ; goto end_probe ; }
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}
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for (i = 0; i < 8; i++) { /* Walking one */
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data = (1 << i);
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if (!lpt_port_test(port, data, mask))
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{ status = 0 ; goto end_probe ; }
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}
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end_probe:
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/* write 0's to control and data ports */
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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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/* XXX Todo - try and detect if interrupt is working */
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int
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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_primed = 0; /* not primed yet */
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outb(sc->sc_port+lpt_control, LPC_NINIT);
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/* check if we can use interrupt */
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lprintf("oldirq %x\n", sc->sc_irq);
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if(isdp->id_irq) {
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sc->sc_irq = LP_HAS_IRQ | LP_USE_IRQ;
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printf("lpt%d: Interrupt-driven port\n", isdp->id_unit);
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} else {
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sc->sc_irq = 0;
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lprintf("lpt%d: Polled port\n", isdp->id_unit);
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}
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lprintf("irq %x\n", sc->sc_irq);
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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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int
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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;
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int s;
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int trys, port;
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u_int unit = LPTUNIT(minor(dev));
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sc = lpt_sc + unit;
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if ((unit >= NLPT) || (sc->sc_port == 0))
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return (ENXIO);
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/* Only check open bit */
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if (sc->sc_state) {
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lprintf("lp: still open\n") ;
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lprintf("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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lprintf ("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 ((caddr_t)sc, LPPRI|PCATCH, "lptinit",
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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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sc->sc_control = LPC_SEL|LPC_NINIT;
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if(sc->sc_flags&LP_AUTOLF)
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sc->sc_control |= LPC_AUTOL;
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/* enable interrupt if interrupt-driven */
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if(sc->sc_irq & LP_USE_IRQ)
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sc->sc_control |= LPC_ENA;
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outb(port+lpt_control, sc->sc_control);
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sc->sc_state = OPEN;
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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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/* only use timeout if using interrupt */
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lprintf("irq %x\n", sc->sc_irq);
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if(sc->sc_irq & LP_USE_IRQ) {
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sc->sc_state |= TOUT;
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timeout (lptout, (caddr_t)sc, hz/2);
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}
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lprintf("opened.\n");
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return(0);
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}
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void
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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, (caddr_t)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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* Check for interrupted write call added.
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*/
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int
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lptclose(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 port = sc->sc_port;
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sc->sc_state &= ~OPEN;
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/* if the last write was interrupted, don't complete it */
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if((!(sc->sc_state & INTERRUPTED)) && (sc->sc_irq & LP_USE_IRQ))
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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 ((caddr_t)sc, LPPRI|PCATCH,
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"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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* pushbytes()
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* Workhorse for actually spinning and writing bytes to printer
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* Derived from lpa.c
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* Originally by ?
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*
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* This code is only used when we are polling the port
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*/
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static int
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pushbytes(sc)
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struct lpt_softc *sc;
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{
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int spin, err, tic;
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char ch;
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int port = sc->sc_port;
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/* loop for every character .. */
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while (sc->sc_xfercnt > 0) {
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/* printer data */
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ch = *(sc->sc_cp);
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sc->sc_cp++;
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sc->sc_xfercnt--;
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/*
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* Wait for printer ready.
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* Loop 20 usecs testing BUSY bit, then sleep
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* for exponentially increasing timeout. (vak)
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*/
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for (spin=0; NOT_READY(port+lpt_status) && spin<MAX_SPIN; ++spin)
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DELAY(1); /* XXX delay is NOT this accurate! */
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if (spin >= MAX_SPIN) {
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tic = 0;
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while (NOT_READY(port+lpt_status)) {
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/*
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* Now sleep, every cycle a
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* little longer ..
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*/
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tic = tic + tic + 1;
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/*
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* But no more than 10 seconds. (vak)
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*/
|
|
if (tic > MAX_SLEEP)
|
|
tic = MAX_SLEEP;
|
|
err = tsleep((caddr_t)sc, LPPRI,
|
|
"lptpoll", tic);
|
|
if (err != EWOULDBLOCK) {
|
|
return (err);
|
|
}
|
|
}
|
|
}
|
|
|
|
/* output data */
|
|
outb(port+lpt_data, ch);
|
|
/* strobe */
|
|
outb(port+lpt_control, sc->sc_control|LPC_STB);
|
|
outb(port+lpt_control, sc->sc_control);
|
|
|
|
}
|
|
return(0);
|
|
}
|
|
|
|
/*
|
|
* lptwrite --copy a line from user space to a local buffer, then call
|
|
* putc to get the chars moved to the output queue.
|
|
*
|
|
* Flagging of interrupted write added.
|
|
*/
|
|
|
|
int
|
|
lptwrite(dev, uio)
|
|
dev_t dev;
|
|
struct uio *uio;
|
|
{
|
|
register unsigned n;
|
|
int pl, err;
|
|
struct lpt_softc *sc = lpt_sc + LPTUNIT(minor(dev));
|
|
|
|
sc->sc_state &= ~INTERRUPTED;
|
|
while (n = MIN(BUFSIZE, uio->uio_resid)) {
|
|
sc->sc_cp = sc->sc_inbuf->b_un.b_addr ;
|
|
uiomove(sc->sc_cp, n, uio);
|
|
sc->sc_xfercnt = n ;
|
|
if(sc->sc_irq & LP_USE_IRQ)
|
|
while (sc->sc_xfercnt > 0) {
|
|
lprintf("i");
|
|
/* if the printer is ready for a char, */
|
|
/* give it one */
|
|
if ((sc->sc_state & OBUSY) == 0){
|
|
lprintf("\nC %d. ", sc->sc_xfercnt);
|
|
pl = spltty();
|
|
lptintr(sc - lpt_sc);
|
|
(void) splx(pl);
|
|
}
|
|
lprintf("W ");
|
|
if (sc->sc_state & OBUSY)
|
|
if (err = tsleep ((caddr_t)sc,
|
|
LPPRI|PCATCH, "lpwrite", 0)) {
|
|
sc->sc_state |= INTERRUPTED;
|
|
return(err);
|
|
}
|
|
}
|
|
else { /* polled write */
|
|
lprintf("p");
|
|
if((err = pushbytes(sc)))
|
|
return(err);
|
|
}
|
|
}
|
|
return(0);
|
|
}
|
|
|
|
/*
|
|
* lptintr -- handle printer interrupts which occur when the printer is
|
|
* ready to accept another char.
|
|
*
|
|
* do checking for interrupted write call.
|
|
*/
|
|
|
|
void
|
|
lptintr(unit)
|
|
int unit;
|
|
{
|
|
struct lpt_softc *sc = lpt_sc + unit;
|
|
int port = sc->sc_port, sts;
|
|
|
|
/* is printer online and ready for output */
|
|
if (((sts=inb(port+lpt_status)) & RDY_MASK) == LP_READY) {
|
|
sc->sc_state = (sc->sc_state | OBUSY) & ~ERROR;
|
|
|
|
if (sc->sc_xfercnt) {
|
|
/* send char */
|
|
/*lprintf("%x ", *sc->sc_cp); */
|
|
outb(port+lpt_data, *sc->sc_cp++) ;
|
|
outb(port+lpt_control, sc->sc_control|LPC_STB);
|
|
/* DELAY(X) */
|
|
outb(port+lpt_control, sc->sc_control);
|
|
|
|
/* any more data for printer */
|
|
if(--(sc->sc_xfercnt) > 0) return;
|
|
}
|
|
|
|
/*
|
|
* No more data waiting for printer.
|
|
* Wakeup is not done if write call was interrupted.
|
|
*/
|
|
sc->sc_state &= ~OBUSY;
|
|
if(!(sc->sc_state & INTERRUPTED))
|
|
wakeup((caddr_t)sc);
|
|
lprintf("w ");
|
|
return;
|
|
} else { /* check for error */
|
|
if(((sts & (LPS_NERR | LPS_OUT) ) != LPS_NERR) &&
|
|
(sc->sc_state & OPEN))
|
|
sc->sc_state |= ERROR;
|
|
}
|
|
lprintf("sts %x ", sts);
|
|
}
|
|
|
|
int
|
|
lptioctl(dev, cmd, data, flag)
|
|
dev_t dev;
|
|
int cmd;
|
|
caddr_t data;
|
|
int flag;
|
|
{
|
|
int error;
|
|
|
|
error = 0;
|
|
switch (cmd) {
|
|
#ifdef THISISASAMPLE
|
|
case XXX:
|
|
dothis; andthis; andthat;
|
|
error=x;
|
|
break;
|
|
#endif /* THISISASAMPLE */
|
|
default:
|
|
error = ENODEV;
|
|
}
|
|
|
|
return(error);
|
|
}
|
|
|
|
#endif /* NLPT */
|