sys/dev/isa/atppc_isa.c

   1 /* $NetBSD: atppc_isa.c,v 1.13 2008/04/15 15:02:28 cegger Exp $ */
   2
   3 /*-
   4  * Copyright (c) 2001 Alcove - Nicolas Souchu
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  26  * SUCH DAMAGE.
  27  *
  28  * FreeBSD: src/sys/isa/ppc.c,v 1.26.2.5 2001/10/02 05:21:45 nsouch Exp
  29  *
  30  */
  31
  32 #include <sys/cdefs.h>
  33 __KERNEL_RCSID(0, "$NetBSD: atppc_isa.c,v 1.13 2008/04/15 15:02:28 cegger Exp $");
  34
  35 #include "opt_atppc.h"
  36
  37 #include <sys/param.h>
  38 #include <sys/systm.h>
  39 #include <sys/kernel.h>
  40 #include <sys/malloc.h>
  41 #include <sys/device.h>
  42
  43 #include <sys/intr.h>
  44 #include <sys/bus.h>
  45
  46 #include <dev/isa/isareg.h>
  47 #include <dev/isa/isavar.h>
  48 #include <dev/isa/isadmavar.h>
  49
  50 #include <dev/ic/atppcreg.h>
  51 #include <dev/ic/atppcvar.h>
  52 #include <dev/isa/atppc_isadma.h>
  53
  54 /*
  55  * ISA bus attach code for atppc driver.
  56  * Note on capabilities: capabilites may exist in the chipset but may not
  57  * necessarily be useable. I.e. you may specify an IRQ in the autoconfig, but
  58  * will the port actually have an IRQ assigned to it at the hardware level?
  59  * How can you test if the capabilites can be used? For interrupts, see if a
  60  * handler exists (sc_intr != NULL). For DMA, see if the sc_dma_start() and
  61  * sc_dma_finish() function pointers are not NULL.
  62  */
  63
  64 /* Configuration data for atppc on isa bus. */
  65 struct atppc_isa_softc {
  66         /* Machine independent device data */
  67         struct atppc_softc sc_atppc;
  68
  69         /* IRQ/DRQ/IO Port assignments on ISA bus */
  70         int sc_irq;
  71         int sc_drq;
  72         int sc_iobase;
  73
  74         /* ISA chipset tag */
  75         isa_chipset_tag_t sc_ic;
  76 };
  77
  78 /* Probe and attach functions for a atppc device on the ISA bus. */
  79 static int atppc_isa_probe(device_t, cfdata_t, void *);
  80 static void atppc_isa_attach(device_t, device_t, void *);
  81
  82 static int atppc_isa_dma_start(struct atppc_softc *, void *, u_int,
  83         u_int8_t);
  84 static int atppc_isa_dma_finish(struct atppc_softc *);
  85 static int atppc_isa_dma_abort(struct atppc_softc *);
  86 static int atppc_isa_dma_malloc(device_t, void **, bus_addr_t *,
  87         bus_size_t);
  88 static void atppc_isa_dma_free(device_t, void **, bus_addr_t *,
  89         bus_size_t);
  90
  91 CFATTACH_DECL_NEW(atppc_isa, sizeof(struct atppc_isa_softc), atppc_isa_probe,
  92         atppc_isa_attach, NULL, NULL);
  93
  94 /*
  95  * Probe function: find parallel port controller on isa bus. Combined from
  96  * lpt_isa_probe() in lpt.c and atppc_detect_port() from FreeBSD's ppc.c.
  97  */
  98 static int
  99 atppc_isa_probe(device_t parent, cfdata_t cf, void *aux)
 100 {
 101         bus_space_handle_t ioh;
 102         struct isa_attach_args *ia = aux;
 103         bus_space_tag_t iot = ia->ia_iot;
 104         int rval = 0;
 105
 106         if (ia->ia_nio < 1)
 107                 return (0);
 108
 109         /* Disallow wildcarded i/o address */
 110         if (ia->ia_io[0].ir_addr == ISA_UNKNOWN_PORT)
 111                 return (0);
 112
 113         if (bus_space_map(iot, ia->ia_io[0].ir_addr, IO_LPTSIZE, 0, &ioh))
 114                 return (0);
 115
 116         if (atppc_detect_port(iot, ioh) == 0)
 117                 rval = 1;
 118
 119         bus_space_unmap(iot, ioh, IO_LPTSIZE);
 120
 121         if (rval) {
 122                 ia->ia_nio = 1;
 123                 ia->ia_io[0].ir_size = IO_LPTSIZE;
 124                 ia->ia_nirq = 1;
 125                 ia->ia_ndrq = 1;
 126                 ia->ia_niomem = 0;
 127         }
 128         return (rval);
 129 }
 130
 131 /* Attach function: attach and configure parallel port controller on isa bus. */
 132 static void
 133 atppc_isa_attach(device_t parent, device_t self, void *aux)
 134 {
 135         struct atppc_isa_softc *sc = device_private(self);
 136         struct atppc_softc *lsc = &sc->sc_atppc;
 137         struct isa_attach_args *ia = aux;
 138
 139         printf(": AT Parallel Port\n");
 140
 141         lsc->sc_iot = ia->ia_iot;
 142         lsc->sc_dmat = ia->ia_dmat;
 143         lsc->sc_has = 0;
 144         sc->sc_ic = ia->ia_ic;
 145         sc->sc_iobase = ia->ia_io->ir_addr;
 146
 147         if (bus_space_map(lsc->sc_iot, sc->sc_iobase, IO_LPTSIZE, 0,
 148                 &lsc->sc_ioh) != 0) {
 149                 aprint_error_dev(self, "attempt to map bus space failed, device not "
 150                         "properly attached.\n");
 151                 lsc->sc_dev_ok = ATPPC_NOATTACH;
 152                 return;
 153         }
 154
 155         lsc->sc_dev = self;
 156         lsc->sc_dev_ok = ATPPC_ATTACHED;
 157
 158         /* Assign interrupt handler */
 159         if (!(device_cfdata(self)->cf_flags & ATPPC_FLAG_DISABLE_INTR)
 160            && ia->ia_irq->ir_irq != ISA_UNKNOWN_IRQ
 161            && ia->ia_nirq >= 1) {
 162                 sc->sc_irq = ia->ia_irq[0].ir_irq;
 163         } else
 164                 sc->sc_irq = -1;
 165
 166         if (sc->sc_irq > 0) {
 167                 /* Establish interrupt handler. */
 168                 lsc->sc_ieh = isa_intr_establish(sc->sc_ic, sc->sc_irq,
 169                         IST_EDGE, IPL_ATPPC, atppcintr, lsc->sc_dev);
 170
 171                 lsc->sc_has |= ATPPC_HAS_INTR;
 172         }
 173
 174         /* Configure DMA */
 175         if (!(device_cfdata(self)->cf_flags & ATPPC_FLAG_DISABLE_DMA)
 176             && ia->ia_drq->ir_drq != ISA_UNKNOWN_DRQ
 177             && ia->ia_ndrq >= 1)
 178                 sc->sc_drq = ia->ia_drq[0].ir_drq;
 179         else
 180                 sc->sc_drq = -1;
 181
 182         if (sc->sc_drq != -1
 183             && atppc_isadma_setup(lsc, sc->sc_ic, sc->sc_drq) == 0) {
 184                 lsc->sc_has |= ATPPC_HAS_DMA;
 185
 186                 /* setup DMA hooks */
 187                 lsc->sc_dma_start = atppc_isa_dma_start;
 188                 lsc->sc_dma_finish = atppc_isa_dma_finish;
 189                 lsc->sc_dma_abort = atppc_isa_dma_abort;
 190                 lsc->sc_dma_malloc = atppc_isa_dma_malloc;
 191                 lsc->sc_dma_free = atppc_isa_dma_free;
 192         }
 193
 194         /* Run soft configuration attach */
 195         atppc_sc_attach(lsc);
 196
 197         return;
 198 }
 199
 200 /* Start DMA operation over ISA bus */
 201 static int
 202 atppc_isa_dma_start(struct atppc_softc *lsc, void *buf, u_int nbytes,
 203         u_int8_t mode)
 204 {
 205         struct atppc_isa_softc *sc = (struct atppc_isa_softc *) lsc;
 206
 207         return atppc_isadma_start(sc->sc_ic, sc->sc_drq, buf, nbytes, mode);
 208 }
 209
 210 /* Stop DMA operation over ISA bus */
 211 static int
 212 atppc_isa_dma_finish(struct atppc_softc *lsc)
 213 {
 214         struct atppc_isa_softc *sc = (struct atppc_isa_softc *) lsc;
 215
 216         return atppc_isadma_finish(sc->sc_ic, sc->sc_drq);
 217 }
 218
 219 /* Abort DMA operation over ISA bus */
 220 static int
 221 atppc_isa_dma_abort(struct atppc_softc *lsc)
 222 {
 223         struct atppc_isa_softc *sc = (struct atppc_isa_softc *) lsc;
 224
 225         return atppc_isadma_abort(sc->sc_ic, sc->sc_drq);
 226 }
 227
 228 /* Allocate memory for DMA over ISA bus */
 229 static int
 230 atppc_isa_dma_malloc(device_t dev, void **buf, bus_addr_t *bus_addr,
 231         bus_size_t size)
 232 {
 233         struct atppc_isa_softc *sc = device_private(dev);
 234
 235         return atppc_isadma_malloc(sc->sc_ic, sc->sc_drq, buf, bus_addr, size);
 236 }
 237
 238 /* Free memory allocated by atppc_isa_dma_malloc() */
 239 static void
 240 atppc_isa_dma_free(device_t dev, void **buf, bus_addr_t *bus_addr,
 241         bus_size_t size)
 242 {
 243         struct atppc_isa_softc *sc = device_private(dev);
 244
 245         return atppc_isadma_free(sc->sc_ic, sc->sc_drq, buf, bus_addr, size);
 246 }