sys/arch/acorn26/ioc/arcpp.c

   1 /* $NetBSD: arcpp.c,v 1.10 2009/01/07 23:05:46 bjh21 Exp $ */
   2
   3 /*-
   4  * Copyright (c) 2001 Ben Harris
   5  * Copyright (c) 1993, 1994 Charles M. Hannum.
   6  * Copyright (c) 1990 William F. Jolitz, TeleMuse
   7  * All rights reserved.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  * 2. Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in the
  16  *    documentation and/or other materials provided with the distribution.
  17  * 3. All advertising materials mentioning features or use of this software
  18  *    must display the following acknowledgement:
  19  *      This software is a component of "386BSD" developed by
  20  *      William F. Jolitz, TeleMuse.
  21  * 4. Neither the name of the developer nor the name "386BSD"
  22  *    may be used to endorse or promote products derived from this software
  23  *    without specific prior written permission.
  24  *
  25  * THIS SOFTWARE IS A COMPONENT OF 386BSD DEVELOPED BY WILLIAM F. JOLITZ
  26  * AND IS INTENDED FOR RESEARCH AND EDUCATIONAL PURPOSES ONLY. THIS
  27  * SOFTWARE SHOULD NOT BE CONSIDERED TO BE A COMMERCIAL PRODUCT.
  28  * THE DEVELOPER URGES THAT USERS WHO REQUIRE A COMMERCIAL PRODUCT
  29  * NOT MAKE USE OF THIS WORK.
  30  *
  31  * FOR USERS WHO WISH TO UNDERSTAND THE 386BSD SYSTEM DEVELOPED
  32  * BY WILLIAM F. JOLITZ, WE RECOMMEND THE USER STUDY WRITTEN
  33  * REFERENCES SUCH AS THE  "PORTING UNIX TO THE 386" SERIES
  34  * (BEGINNING JANUARY 1991 "DR. DOBBS JOURNAL", USA AND BEGINNING
  35  * JUNE 1991 "UNIX MAGAZIN", GERMANY) BY WILLIAM F. JOLITZ AND
  36  * LYNNE GREER JOLITZ, AS WELL AS OTHER BOOKS ON UNIX AND THE
  37  * ON-LINE 386BSD USER MANUAL BEFORE USE. A BOOK DISCUSSING THE INTERNALS
  38  * OF 386BSD ENTITLED "386BSD FROM THE INSIDE OUT" WILL BE AVAILABLE LATE 1992.
  39  *
  40  * THIS SOFTWARE IS PROVIDED BY THE DEVELOPER ``AS IS'' AND
  41  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  42  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  43  * ARE DISCLAIMED.  IN NO EVENT SHALL THE DEVELOPER BE LIABLE
  44  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  45  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  46  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  47  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  48  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  49  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  50  * SUCH DAMAGE.
  51  */
  52
  53 #include <sys/param.h>
  54
  55 __KERNEL_RCSID(0, "$NetBSD: arcpp.c,v 1.10 2009/01/07 23:05:46 bjh21 Exp $");
  56
  57 #include <sys/conf.h>
  58 #include <sys/device.h>
  59 #include <sys/kernel.h>
  60 #include <sys/malloc.h>
  61 #include <sys/proc.h>
  62 #include <sys/systm.h>
  63
  64 #include <machine/bus.h>
  65 #include <machine/intr.h>
  66 #include <machine/irq.h>
  67
  68 #include <arch/acorn26/iobus/iocvar.h>
  69 #include <arch/acorn26/ioc/arcppreg.h>
  70 #include <arch/acorn26/ioc/latchreg.h>
  71 #include <arch/acorn26/ioc/latchvar.h>
  72 #include <arch/acorn26/ioc/ioebvar.h>
  73
  74 #include "ioeb.h"
  75
  76 struct arcpp_softc {
  77         device_t        sc_dev;
  78         void            *sc_aih;        /* ACK interrupt handler */
  79         struct evcnt    sc_aintrcnt;    /* ... and count */
  80         void            *sc_bih;        /* BUSY interrupt handler */
  81         struct evcnt    sc_bintrcnt;    /* ... and count */
  82         size_t sc_count;
  83         void *sc_inbuf;
  84         u_char *sc_cp;
  85         int sc_spinmax;
  86         bus_space_tag_t sc_iot;
  87         bus_space_handle_t sc_ioh;
  88         u_char sc_state;
  89 #define ARCPP_OPEN      0x01    /* device is open */
  90 #define ARCPP_OBUSY     0x02    /* printer is busy doing output */
  91 #define ARCPP_INIT      0x04    /* waiting to initialize for open */
  92         u_char sc_flags;
  93 /*#define       ARCPP_AUTOLF    0x20    * automatic LF on CR */
  94 /*#define       ARCPP_NOPRIME   0x40    * don't prime on open */
  95 /*#define       ARCPP_NOINTR    0x80    * do not use interrupt */
  96         u_char sc_laststatus;
  97 };
  98
  99 #define TIMEOUT         (hz*16) /* wait up to 16 seconds for a ready */
 100 #define STEP            (hz/4)
 101
 102 #define ARCPPPRI        (PZERO+8)
 103 #define ARCPP_BSIZE     1024
 104
 105 extern struct cfdriver arcpp_cd;
 106
 107 dev_type_open(arcppopen);
 108 dev_type_close(arcppclose);
 109 dev_type_write(arcppwrite);
 110
 111 const struct cdevsw arcpp_cdevsw = {
 112         arcppopen, arcppclose, noread, arcppwrite, noioctl,
 113         nostop, notty, nopoll, nommap, nokqfilter,
 114 };
 115
 116 #define ARCPPUNIT(s)    (minor(s) & 0x1f)
 117 #define ARCPPFLAGS(s)   (minor(s) & 0xe0)
 118
 119 static int arcpp_match(device_t, cfdata_t, void *);
 120 static void arcpp_attach(device_t, device_t, void *);
 121
 122 static int arcppintr(void *);
 123 static int arcpppushbytes(struct arcpp_softc *);
 124
 125 CFATTACH_DECL_NEW(arcpp, sizeof(struct arcpp_softc),
 126     arcpp_match, arcpp_attach, NULL, NULL);
 127
 128 static int
 129 arcpp_match(device_t parent, cfdata_t cf, void *aux)
 130 {
 131
 132         /*
 133          * The parallel port is write-only, so we can't probe for it.
 134          * Happily, the set of machines it exists on is precisely the
 135          * set that doesn't have IOEBs, so...
 136          */
 137 #if NIOEB > 0
 138         if (the_ioeb != NULL)
 139                 return 0;
 140 #endif
 141         return 1;
 142 }
 143
 144 static void
 145 arcpp_attach(device_t parent, device_t self, void *aux)
 146 {
 147         struct arcpp_softc *sc = device_private(self);
 148         struct ioc_attach_args *ioc = aux;
 149         bus_space_tag_t iot;
 150         bus_space_handle_t ioh;
 151
 152         sc->sc_dev = self;
 153
 154         iot = sc->sc_iot = ioc->ioc_fast_t;
 155         ioh = sc->sc_ioh = ioc->ioc_fast_h;
 156
 157         evcnt_attach_dynamic(&sc->sc_aintrcnt, EVCNT_TYPE_INTR, NULL,
 158             device_xname(self), "ack intr");
 159         evcnt_attach_dynamic(&sc->sc_bintrcnt, EVCNT_TYPE_INTR, NULL,
 160             device_xname(self), "busy intr");
 161         sc->sc_aih = irq_establish(IRQ_PACK, IPL_VM, arcppintr, sc,
 162             &sc->sc_aintrcnt);
 163         sc->sc_bih = irq_establish(IRQ_PBSY, IPL_VM, arcppintr, sc,
 164             &sc->sc_bintrcnt);
 165
 166         /* We're not interested in interrupts while the device is closed. */
 167         irq_disable(sc->sc_aih);
 168         irq_disable(sc->sc_bih);
 169
 170         aprint_normal("\n");
 171 }
 172
 173 /*
 174  * Wait until the printer's selected and not busy.
 175  */
 176 int
 177 arcppopen(dev_t dev, int flag, int mode, struct lwp *l)
 178 {
 179         u_char flags = ARCPPFLAGS(dev);
 180         struct arcpp_softc *sc;
 181         bus_space_tag_t iot;
 182         bus_space_handle_t ioh;
 183         int error, s;
 184
 185         sc = device_lookup_private(&arcpp_cd, ARCPPUNIT(dev));
 186         if (sc == NULL)
 187                 return ENXIO;
 188
 189 #ifdef DIAGNOSTIC
 190         if (sc->sc_state)
 191                 printf("%s: stat=0x%x not zero\n", device_xname(sc->sc_dev),
 192                     sc->sc_state);
 193 #endif
 194
 195         if (sc->sc_state)
 196                 return EBUSY;
 197
 198         sc->sc_state = ARCPP_INIT;
 199         sc->sc_flags = flags;
 200         iot = sc->sc_iot;
 201         ioh = sc->sc_ioh;
 202
 203         s = splvm();
 204         /* wait till ready (printer running diagnostics) */
 205         irq_enable(sc->sc_bih);
 206         /* XXX Is it really appropriate to time out? */
 207         error = tsleep((void *)sc, ARCPPPRI | PCATCH, "arcppopen", TIMEOUT);
 208         if (error == EWOULDBLOCK) {
 209                 sc->sc_state = 0;
 210                 return EBUSY;
 211         }
 212         if (error) {
 213                 sc->sc_state = 0;
 214                 return error;
 215         }
 216
 217         sc->sc_inbuf = malloc(ARCPP_BSIZE, M_DEVBUF, M_WAITOK);
 218         sc->sc_count = 0;
 219
 220         sc->sc_state = ARCPP_OPEN;
 221
 222         arcppintr(sc);
 223         splx(s);
 224
 225         return 0;
 226 }
 227
 228 /*
 229  * Close the device, and free the local line buffer.
 230  */
 231 int
 232 arcppclose(dev_t dev, int flag, int mode, struct lwp *l)
 233 {
 234         struct arcpp_softc *sc = device_lookup_private(&arcpp_cd, ARCPPUNIT(dev));
 235
 236         if (sc->sc_count)
 237                 (void) arcpppushbytes(sc);
 238
 239         irq_disable(sc->sc_aih);
 240         irq_disable(sc->sc_bih);
 241         sc->sc_state = 0;
 242         free(sc->sc_inbuf, M_DEVBUF);
 243
 244         return 0;
 245 }
 246
 247 static int
 248 arcpppushbytes(struct arcpp_softc *sc)
 249 {
 250         int error;
 251         int s;
 252
 253         while (sc->sc_count > 0) {
 254                 /* if the printer is ready for a char, give it one */
 255                 if ((sc->sc_state & ARCPP_OBUSY) == 0) {
 256                         s = splvm();
 257                         arcppintr(sc);
 258                         splx(s);
 259                 }
 260                 error = tsleep((void *)sc, ARCPPPRI | PCATCH, "arcppwr", 0);
 261                 if (error)
 262                         return error;
 263         }
 264         return 0;
 265 }
 266
 267 int
 268 arcppwrite(dev_t dev, struct uio *uio, int flags)
 269 {
 270         struct arcpp_softc *sc = device_lookup_private(&arcpp_cd, ARCPPUNIT(dev));
 271         size_t n;
 272         int error = 0;
 273
 274         while ((n = min(ARCPP_BSIZE, uio->uio_resid)) != 0) {
 275                 uiomove(sc->sc_cp = sc->sc_inbuf, n, uio);
 276                 sc->sc_count = n;
 277                 error = arcpppushbytes(sc);
 278                 if (error) {
 279                         /*
 280                          * Return accurate residual if interrupted or timed
 281                          * out.
 282                          */
 283                         uio->uio_resid += sc->sc_count;
 284                         sc->sc_count = 0;
 285                         return error;
 286                 }
 287         }
 288         return 0;
 289 }
 290
 291 /*
 292  * Handle printer interrupts which occur when the printer is ready to accept
 293  * another char.
 294  */
 295 int
 296 arcppintr(void *arg)
 297 {
 298         struct arcpp_softc *sc = arg;
 299         bus_space_tag_t iot = sc->sc_iot;
 300         bus_space_handle_t ioh = sc->sc_ioh;
 301
 302         /* is printer online and ready for output */
 303         if (!ioc_irq_status(IRQ_PBSY)) {
 304                 return 0;
 305         }
 306
 307         if (sc->sc_count) {
 308                 /* send char */
 309                 bus_space_write_1(iot, ioh, ARCPP_DATA, *sc->sc_cp++);
 310                 DELAY(1);
 311                 latchb_update(LATCHB_NPSTB, 0);
 312                 DELAY(1);
 313                 sc->sc_count--;
 314                 latchb_update(LATCHB_NPSTB, LATCHB_NPSTB);
 315                 DELAY(1);
 316                 sc->sc_state |= ARCPP_OBUSY;
 317         } else
 318                 sc->sc_state &= ~ARCPP_OBUSY;
 319
 320         if (sc->sc_count == 0)
 321                 /* none, wake up the top half to get more */
 322                 wakeup((void *)sc);
 323
 324         return 1;
 325 }