sys/arch/dreamcast/dev/g2/gapspci_pci.c

   1 /*      $NetBSD: gapspci_pci.c,v 1.10 2007/03/12 14:03:47 tsutsui Exp $ */
   2
   3 /*-
   4  * Copyright (c) 2001 Marcus Comstedt.
   5  * Copyright (c) 2001 Jason R. Thorpe.
   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 product includes software developed by Marcus Comstedt.
  19  * 4. Neither the name of The NetBSD Foundation nor the names of its
  20  *    contributors may be used to endorse or promote products derived
  21  *    from this software without specific prior written permission.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
  24  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  25  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  26  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  27  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  28  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  29  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  30  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  31  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  32  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  33  * POSSIBILITY OF SUCH DAMAGE.
  34  */
  35
  36 /*
  37  * PCI configuraiton space implementation for the SEGA GAPS PCI bridge.
  38  */
  39
  40 #include <sys/cdefs.h>                  /* RCS ID & Copyright macro defns */
  41 __KERNEL_RCSID(0, "$NetBSD: gapspci_pci.c,v 1.10 2007/03/12 14:03:47 tsutsui Exp $");
  42
  43 #include <sys/param.h>
  44 #include <sys/systm.h>
  45 #include <sys/kernel.h>
  46 #include <sys/device.h>
  47
  48 #include <machine/cpu.h>
  49 #include <machine/bus.h>
  50 #include <machine/sysasicvar.h>
  51
  52 #include <dev/pci/pcivar.h>
  53 #include <dev/pci/pcireg.h>
  54
  55 #include <dreamcast/dev/g2/gapspcivar.h>
  56
  57 void            gaps_attach_hook(struct device *, struct device *,
  58                     struct pcibus_attach_args *);
  59 int             gaps_bus_maxdevs(void *, int);
  60 pcitag_t        gaps_make_tag(void *, int, int, int);
  61 void            gaps_decompose_tag(void *, pcitag_t, int *, int *, int *);
  62 pcireg_t        gaps_conf_read(void *, pcitag_t, int);
  63 void            gaps_conf_write(void *, pcitag_t, int, pcireg_t);
  64
  65 int             gaps_intr_map(struct pci_attach_args *, pci_intr_handle_t *);
  66 const char      *gaps_intr_string(void *, pci_intr_handle_t);
  67 void            *gaps_intr_establish(void *, pci_intr_handle_t,
  68                     int, int (*)(void *), void *);
  69 void            gaps_intr_disestablish(void *, void *);
  70
  71 void
  72 gaps_pci_init(struct gaps_softc *sc)
  73 {
  74         pci_chipset_tag_t pc = &sc->sc_pc;
  75
  76         memset(pc, 0, sizeof(*pc));
  77
  78         pc->pc_attach_hook = gaps_attach_hook;
  79         pc->pc_bus_maxdevs = gaps_bus_maxdevs;
  80         pc->pc_make_tag = gaps_make_tag;
  81         pc->pc_decompose_tag = gaps_decompose_tag;
  82         pc->pc_conf_read = gaps_conf_read;
  83         pc->pc_conf_write = gaps_conf_write;
  84         pc->pc_conf_v = sc;
  85
  86         pc->pc_intr_map = gaps_intr_map;
  87         pc->pc_intr_string = gaps_intr_string;
  88         pc->pc_intr_establish = gaps_intr_establish;
  89         pc->pc_intr_disestablish = gaps_intr_disestablish;
  90
  91         if (bus_space_map(sc->sc_memt, 0x01001600, 0x100,
  92             0, &sc->sc_pci_memh) != 0)
  93                 panic("gaps_pci_init: can't map PCI configuration space");
  94 }
  95
  96 #define GAPS_PCITAG_MAGIC       0x022473
  97
  98 void
  99 gaps_attach_hook(struct device *bus, struct device *pci,
 100     struct pcibus_attach_args *pba)
 101 {
 102         struct gaps_softc *sc = (void *)bus;
 103
 104         /*
 105          * Now that we know there's a bus configured, go ahead and
 106          * program the BAR on the device.
 107          */
 108         pci_conf_write(&sc->sc_pc, GAPS_PCITAG_MAGIC,
 109             PCI_MAPREG_START + 4, 0x01000000);
 110         pci_conf_write(&sc->sc_pc, GAPS_PCITAG_MAGIC, PCI_COMMAND_STATUS_REG,
 111             pci_conf_read(&sc->sc_pc, 0, PCI_COMMAND_STATUS_REG) |
 112             PCI_COMMAND_MEM_ENABLE | PCI_COMMAND_MASTER_ENABLE);
 113 }
 114
 115 int
 116 gaps_bus_maxdevs(void *v, int bus)
 117 {
 118
 119         return 1;
 120 }
 121
 122 pcitag_t
 123 gaps_make_tag(void *v, int bus, int dev, int func)
 124 {
 125
 126         if (bus == 0 && dev == 0 && func == 0)
 127                 return GAPS_PCITAG_MAGIC;
 128
 129         return 0;
 130 }
 131
 132 void
 133 gaps_decompose_tag(void *v, pcitag_t tag, int *bp, int *dp, int *fp)
 134 {
 135         int b, d, f;
 136
 137         if (tag == GAPS_PCITAG_MAGIC)
 138                 b = d = f = 0;
 139         else {
 140                 /*
 141                  * Invalid for GAPS.  These values ensure that a valid
 142                  * tag cannot be built.
 143                  */
 144                 b = 0xff;
 145                 d = 0x1f;
 146                 f = 0x7;
 147         }
 148
 149         if (bp != NULL)
 150                 *bp = b;
 151         if (dp != NULL)
 152                 *dp = d;
 153         if (fp != NULL)
 154                 *fp = f;
 155 }
 156
 157 pcireg_t
 158 gaps_conf_read(void *v, pcitag_t tag, int reg)
 159 {
 160         struct gaps_softc *sc = v;
 161
 162         if (tag != GAPS_PCITAG_MAGIC)
 163                 return -1;
 164
 165         if (reg == (PCI_MAPREG_START + 4)) {
 166                 /*
 167                  * We fake the BAR -- just return the physical address
 168                  * to which the device is mapped.
 169                  */
 170                 return 0x01001700;
 171         }
 172
 173         return bus_space_read_4(sc->sc_memt, sc->sc_pci_memh, reg);
 174 }
 175
 176 void
 177 gaps_conf_write(void *v, pcitag_t tag, int reg, pcireg_t val)
 178 {
 179         struct gaps_softc *sc = v;
 180
 181         if (tag != GAPS_PCITAG_MAGIC)
 182                 return;
 183
 184         /* Disallow writing to the "BAR" ... it doesn't actually exist. */
 185         if (reg == (PCI_MAPREG_START + 4) && val != 0x01000000)
 186                 return;
 187
 188         bus_space_write_4(sc->sc_memt, sc->sc_pci_memh, reg, val);
 189 }
 190
 191 int
 192 gaps_intr_map(struct pci_attach_args *pa, pci_intr_handle_t *ihp)
 193 {
 194
 195         *ihp = SYSASIC_EVENT_EXT;
 196         return 0;
 197 }
 198
 199 const char *
 200 gaps_intr_string(void *v, pci_intr_handle_t ih)
 201 {
 202
 203         return sysasic_intr_string(SYSASIC_IRL11);
 204 }
 205
 206 void *
 207 gaps_intr_establish(void *v, pci_intr_handle_t ih, int level,
 208     int (*func)(void *), void *arg)
 209 {
 210
 211         return sysasic_intr_establish(ih, level, SYSASIC_IRL11, func, arg);
 212 }
 213
 214 void
 215 gaps_intr_disestablish(void *v, void *ih)
 216 {
 217
 218         return sysasic_intr_disestablish(ih);
 219 }