sys/dev/isa/lpt_isa.c

   1 /*      $NetBSD: lpt_isa.c,v 1.67 2008/05/31 14:07:03 jmcneill Exp $    */
   2
   3 /*
   4  * Copyright (c) 1993, 1994 Charles M. 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/cdefs.h>
  57 __KERNEL_RCSID(0, "$NetBSD: lpt_isa.c,v 1.67 2008/05/31 14:07:03 jmcneill Exp $");
  58
  59 #include <sys/param.h>
  60 #include <sys/systm.h>
  61 #include <sys/proc.h>
  62 #include <sys/buf.h>
  63 #include <sys/kernel.h>
  64 #include <sys/ioctl.h>
  65 #include <sys/uio.h>
  66 #include <sys/device.h>
  67 #include <sys/syslog.h>
  68
  69 #include <sys/bus.h>
  70 #include <sys/intr.h>
  71
  72 #include <dev/isa/isavar.h>
  73 #include <dev/ic/lptreg.h>
  74 #include <dev/ic/lptvar.h>
  75
  76 #define LPTPRI          (PZERO+8)
  77 #define LPT_BSIZE       1024
  78
  79 #ifndef LPTDEBUG
  80 #define LPRINTF(a)
  81 #else
  82 #define LPRINTF(a)      if (lpt_isa_debug) printf a
  83 int lpt_isa_debug = 0;
  84 #endif
  85
  86 struct lpt_isa_softc {
  87         struct lpt_softc sc_lpt;
  88         int sc_irq;
  89         isa_chipset_tag_t sc_ic;
  90
  91 };
  92
  93 int lpt_isa_probe(device_t, cfdata_t, void *);
  94 static void lpt_isa_attach(device_t, device_t, void *);
  95 static int lpt_isa_detach(device_t, int);
  96
  97 CFATTACH_DECL_NEW(lpt_isa, sizeof(struct lpt_isa_softc),
  98     lpt_isa_probe, lpt_isa_attach, lpt_isa_detach, NULL);
  99
 100 int lpt_port_test(bus_space_tag_t, bus_space_handle_t, bus_addr_t,
 101             bus_size_t, u_char, u_char);
 102
 103 /*
 104  * Internal routine to lptprobe to do port tests of one byte value.
 105  */
 106 int
 107 lpt_port_test(bus_space_tag_t iot, bus_space_handle_t ioh,
 108     bus_addr_t base, bus_size_t off, u_char data, u_char mask)
 109 {
 110         int timeout;
 111         u_char temp;
 112
 113         data &= mask;
 114         bus_space_write_1(iot, ioh, off, data);
 115         timeout = 1000;
 116         do {
 117                 delay(10);
 118                 temp = bus_space_read_1(iot, ioh, off) & mask;
 119         } while (temp != data && --timeout);
 120         LPRINTF(("lpt: port=0x%x out=0x%x in=0x%x timeout=%d\n",
 121             (unsigned)(base + off), (unsigned)data, (unsigned)temp, timeout));
 122         return (temp == data);
 123 }
 124
 125 /*
 126  * Logic:
 127  *      1) You should be able to write to and read back the same value
 128  *         to the data port.  Do an alternating zeros, alternating ones,
 129  *         walking zero, and walking one test to check for stuck bits.
 130  *
 131  *      2) You should be able to write to and read back the same value
 132  *         to the control port lower 5 bits, the upper 3 bits are reserved
 133  *         per the IBM PC technical reference manauls and different boards
 134  *         do different things with them.  Do an alternating zeros, alternating
 135  *         ones, walking zero, and walking one test to check for stuck bits.
 136  *
 137  *         Some printers drag the strobe line down when the are powered off
 138  *         so this bit has been masked out of the control port test.
 139  *
 140  *         XXX Some printers may not like a fast pulse on init or strobe, I
 141  *         don't know at this point, if that becomes a problem these bits
 142  *         should be turned off in the mask byte for the control port test.
 143  *
 144  *      3) Set the data and control ports to a value of 0
 145  */
 146 int
 147 lpt_isa_probe(device_t parent, cfdata_t match, void *aux)
 148 {
 149         struct isa_attach_args *ia = aux;
 150         bus_space_tag_t iot;
 151         bus_space_handle_t ioh;
 152         u_long base;
 153         u_char mask, data;
 154         int i, rv;
 155
 156 #ifdef LPT_DEBUG
 157 #define ABORT   do {printf("lptprobe: mask %x data %x failed\n", mask, data); \
 158                     goto out;} while (0)
 159 #else
 160 #define ABORT   goto out
 161 #endif
 162
 163         if (ia->ia_nio < 1)
 164                 return (0);
 165
 166         if (ISA_DIRECT_CONFIG(ia))
 167                 return (0);
 168
 169         /* Disallow wildcarded i/o address. */
 170         if (ia->ia_io[0].ir_addr == ISA_UNKNOWN_PORT)
 171                 return (0);
 172
 173         iot = ia->ia_iot;
 174         base = ia->ia_io[0].ir_addr;
 175         if (bus_space_map(iot, base, LPT_NPORTS, 0, &ioh))
 176                 return 0;
 177
 178         rv = 0;
 179         mask = 0xff;
 180
 181         data = 0x55;                            /* Alternating zeros */
 182         if (!lpt_port_test(iot, ioh, base, lpt_data, data, mask))
 183                 ABORT;
 184
 185         data = 0xaa;                            /* Alternating ones */
 186         if (!lpt_port_test(iot, ioh, base, lpt_data, data, mask))
 187                 ABORT;
 188
 189         for (i = 0; i < CHAR_BIT; i++) {        /* Walking zero */
 190                 data = ~(1 << i);
 191                 if (!lpt_port_test(iot, ioh, base, lpt_data, data, mask))
 192                         ABORT;
 193         }
 194
 195         for (i = 0; i < CHAR_BIT; i++) {        /* Walking one */
 196                 data = (1 << i);
 197                 if (!lpt_port_test(iot, ioh, base, lpt_data, data, mask))
 198                         ABORT;
 199         }
 200
 201         bus_space_write_1(iot, ioh, lpt_data, 0);
 202         bus_space_write_1(iot, ioh, lpt_control, 0);
 203
 204         ia->ia_io[0].ir_size = LPT_NPORTS;
 205
 206         ia->ia_niomem = 0;
 207         ia->ia_ndrq = 0;
 208
 209         rv = 1;
 210
 211 out:
 212         bus_space_unmap(iot, ioh, LPT_NPORTS);
 213         return rv;
 214 }
 215
 216 void
 217 lpt_isa_attach(device_t parent, device_t self, void *aux)
 218 {
 219         struct lpt_isa_softc *sc = device_private(self);
 220         struct lpt_softc *lsc = &sc->sc_lpt;
 221         struct isa_attach_args *ia = aux;
 222         bus_space_tag_t iot;
 223         bus_space_handle_t ioh;
 224
 225         lsc->sc_dev = self;
 226
 227         if (ia->ia_nirq < 1 ||
 228             ia->ia_irq[0].ir_irq == ISA_UNKNOWN_IRQ) {
 229                 sc->sc_irq = -1;
 230                 aprint_normal(": polled\n");
 231         } else {
 232                 sc->sc_irq = ia->ia_irq[0].ir_irq;
 233                 aprint_normal("\n");
 234         }
 235
 236         if (!pmf_device_register(self, NULL, NULL))
 237                 aprint_error_dev(self, "couldn't establish power handler\n");
 238
 239         iot = lsc->sc_iot = ia->ia_iot;
 240         if (bus_space_map(iot, ia->ia_io[0].ir_addr, LPT_NPORTS, 0, &ioh)) {
 241                 aprint_normal_dev(self, "can't map i/o space\n");
 242                 return;
 243         }
 244         lsc->sc_ioh = ioh;
 245
 246         lpt_attach_subr(lsc);
 247
 248         sc->sc_ic = ia->ia_ic;
 249         if (sc->sc_irq != -1)
 250                 lsc->sc_ih = isa_intr_establish(sc->sc_ic, sc->sc_irq,
 251                     IST_EDGE, IPL_TTY, lptintr, lsc);
 252 }
 253
 254 static int
 255 lpt_isa_detach(device_t self, int flags)
 256 {
 257         int rc;
 258         struct lpt_isa_softc *sc = device_private(self);
 259         struct lpt_softc *lsc = &sc->sc_lpt;
 260
 261         if ((rc = lpt_detach_subr(self, flags)) != 0)
 262                 return rc;
 263
 264         if (sc->sc_irq != -1)
 265                 isa_intr_disestablish(sc->sc_ic, lsc->sc_ih);
 266
 267         bus_space_unmap(lsc->sc_iot, lsc->sc_ioh, LPT_NPORTS);
 268         return 0;
 269 }