lpt_isa.c

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    1 /*      $OpenBSD: lpt_isa.c,v 1.17 2022/04/06 18:59:28 naddy Exp $      */
    2 
    3 /*
    4  * Copyright (c) 1993, 1994 Charles Hannum.
    5  * Copyright (c) 1990 William F. Jolitz, TeleMuse
    6  * All rights reserved.
    7  *
    8  * Redistribution and use in source and binary forms, with or without
    9  * modification, are permitted provided that the following conditions
   10  * are met:
   11  * 1. Redistributions of source code must retain the above copyright
   12  *    notice, this list of conditions and the following disclaimer.
   13  * 2. Redistributions in binary form must reproduce the above copyright
   14  *    notice, this list of conditions and the following disclaimer in the
   15  *    documentation and/or other materials provided with the distribution.
   16  * 3. All advertising materials mentioning features or use of this software
   17  *    must display the following acknowledgement:
   18  *      This software is a component of "386BSD" developed by 
   19  *      William F. Jolitz, TeleMuse.
   20  * 4. Neither the name of the developer nor the name "386BSD"
   21  *    may be used to endorse or promote products derived from this software
   22  *    without specific prior written permission.
   23  *
   24  * THIS SOFTWARE IS A COMPONENT OF 386BSD DEVELOPED BY WILLIAM F. JOLITZ 
   25  * AND IS INTENDED FOR RESEARCH AND EDUCATIONAL PURPOSES ONLY. THIS 
   26  * SOFTWARE SHOULD NOT BE CONSIDERED TO BE A COMMERCIAL PRODUCT. 
   27  * THE DEVELOPER URGES THAT USERS WHO REQUIRE A COMMERCIAL PRODUCT 
   28  * NOT MAKE USE OF THIS WORK.
   29  *
   30  * FOR USERS WHO WISH TO UNDERSTAND THE 386BSD SYSTEM DEVELOPED
   31  * BY WILLIAM F. JOLITZ, WE RECOMMEND THE USER STUDY WRITTEN 
   32  * REFERENCES SUCH AS THE  "PORTING UNIX TO THE 386" SERIES 
   33  * (BEGINNING JANUARY 1991 "DR. DOBBS JOURNAL", USA AND BEGINNING 
   34  * JUNE 1991 "UNIX MAGAZIN", GERMANY) BY WILLIAM F. JOLITZ AND 
   35  * LYNNE GREER JOLITZ, AS WELL AS OTHER BOOKS ON UNIX AND THE 
   36  * ON-LINE 386BSD USER MANUAL BEFORE USE. A BOOK DISCUSSING THE INTERNALS 
   37  * OF 386BSD ENTITLED "386BSD FROM THE INSIDE OUT" WILL BE AVAILABLE LATE 1992.
   38  *
   39  * THIS SOFTWARE IS PROVIDED BY THE DEVELOPER ``AS IS'' AND
   40  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   41  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   42  * ARE DISCLAIMED.  IN NO EVENT SHALL THE DEVELOPER BE LIABLE
   43  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   44  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   45  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   46  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   47  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   48  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   49  * SUCH DAMAGE.
   50  */
   51 
   52 /*
   53  * Device Driver for AT parallel printer port
   54  */
   55 
   56 #include <sys/param.h>
   57 #include <sys/systm.h>
   58 #include <sys/device.h>
   59 
   60 #include <machine/bus.h>
   61 
   62 #include <dev/isa/isavar.h>
   63 #include <dev/ic/lptreg.h>
   64 #include <dev/ic/lptvar.h>
   65 
   66 int     lpt_isa_probe(struct device *, void *, void *);
   67 void    lpt_isa_attach(struct device *, struct device *, void *);
   68 
   69 const struct cfattach lpt_isa_ca = {
   70         sizeof(struct lpt_softc), lpt_isa_probe, lpt_isa_attach, NULL,
   71         lpt_activate
   72 };
   73 
   74 /*
   75  * Logic:
   76  *      1) You should be able to write to and read back the same value
   77  *         to the data port.  Do an alternating zeros, alternating ones,
   78  *         walking zero, and walking one test to check for stuck bits.
   79  *
   80  *      2) You should be able to write to and read back the same value
   81  *         to the control port lower 5 bits, the upper 3 bits are reserved
   82  *         per the IBM PC technical reference manuals and different boards
   83  *         do different things with them.  Do an alternating zeros, alternating
   84  *         ones, walking zero, and walking one test to check for stuck bits.
   85  *
   86  *         Some printers drag the strobe line down when the are powered off
   87  *         so this bit has been masked out of the control port test.
   88  *
   89  *         XXX Some printers may not like a fast pulse on init or strobe, I
   90  *         don't know at this point, if that becomes a problem these bits
   91  *         should be turned off in the mask byte for the control port test.
   92  *
   93  *      3) Set the data and control ports to a value of 0
   94  */
   95 int
   96 lpt_isa_probe(struct device *parent, void *match, void *aux)
   97 {
   98 #if !defined(__NO_ISA_INTR_CHECK)
   99         struct isa_softc *sc = (struct isa_softc *)parent;
  100 #endif
  101         struct isa_attach_args *ia = aux;
  102         bus_space_tag_t iot;
  103         bus_space_handle_t ioh;
  104         bus_addr_t base;
  105         u_int8_t mask, data;
  106         int i, rv, iosz;
  107 
  108 #ifdef DEBUG
  109 #define ABORT                                                                \
  110         do {                                                                 \
  111                 printf("lpt_isa_probe: mask %x data %x failed\n", mask,      \
  112                     data);                                                   \
  113                 goto out;                                                    \
  114         } while (0)
  115 #else
  116 #define ABORT   goto out
  117 #endif
  118 
  119         iot = ia->ia_iot;
  120         base = ia->ia_iobase;
  121         iosz = (ia->ia_iosize == 0x666) ? LPT_NPORTS : ia->ia_iosize;
  122         if (bus_space_map(iot, base, iosz, 0, &ioh))
  123                 return 0;
  124 
  125         rv = 0;
  126         mask = 0xff;
  127 
  128         data = 0x55;                            /* Alternating zeros */
  129         if (!lpt_port_test(iot, ioh, base, lpt_data, data, mask))
  130                 ABORT;
  131 
  132         data = 0xaa;                            /* Alternating ones */
  133         if (!lpt_port_test(iot, ioh, base, lpt_data, data, mask))
  134                 ABORT;
  135 
  136         for (i = 0; i < CHAR_BIT; i++) {        /* Walking zero */
  137                 data = ~(1 << i);
  138                 if (!lpt_port_test(iot, ioh, base, lpt_data, data, mask))
  139                         ABORT;
  140         }
  141 
  142         for (i = 0; i < CHAR_BIT; i++) {        /* Walking one */
  143                 data = (1 << i);
  144                 if (!lpt_port_test(iot, ioh, base, lpt_data, data, mask))
  145                         ABORT;
  146         }
  147 
  148         bus_space_write_1(iot, ioh, lpt_data, 0);
  149         bus_space_write_1(iot, ioh, lpt_control, 0);
  150 
  151         /*
  152          * Check if the specified IRQ is available.  If not revert to
  153          * polled mode.
  154          */
  155 #if !defined(__NO_ISA_INTR_CHECK)
  156         if (ia->ia_irq != IRQUNK &&
  157             !isa_intr_check(sc->sc_ic, ia->ia_irq, IST_EDGE))
  158                 ia->ia_irq = IRQUNK;
  159 #endif
  160         ia->ia_msize = 0;
  161         ia->ia_iosize = iosz;
  162 
  163         rv = 1;
  164 
  165 out:
  166         bus_space_unmap(iot, ioh, iosz);
  167         return rv;
  168 }
  169 
  170 void
  171 lpt_isa_attach(struct device *parent, struct device *self, void *aux)
  172 {
  173         struct lpt_softc *sc = (void *)self;
  174         struct isa_attach_args *ia = aux;
  175 
  176         sc->sc_state = 0;
  177         sc->sc_iot = ia->ia_iot;
  178         if (bus_space_map(sc->sc_iot, ia->ia_iobase, ia->ia_iosize, 0,
  179             &sc->sc_ioh))
  180                 panic("lpt_isa_attach: couldn't map I/O ports");
  181 
  182         if (ia->ia_irq == IRQUNK) {
  183                 sc->sc_flags |= LPT_POLLED;
  184                 printf(": polled");
  185         }
  186 
  187         lpt_attach_common(sc);
  188 
  189         if (ia->ia_irq != IRQUNK)
  190                 sc->sc_ih = isa_intr_establish(ia->ia_ic, ia->ia_irq, IST_EDGE,
  191                     IPL_TTY, lptintr, sc, sc->sc_dev.dv_xname);
  192 }

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FreeBSD/Linux Kernel Cross Reference sys/dev/isa/lpt_isa.c

FreeBSD/Linux Kernel Cross Reference
sys/dev/isa/lpt_isa.c