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

   1 /*      $NetBSD: gapspci.c,v 1.15 2006/08/07 17:36:53 tsutsui Exp $     */
   2
   3 /*-
   4  * Copyright (c) 2001 Marcus Comstedt
   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  * 3. All advertising materials mentioning features or use of this software
  16  *    must display the following acknowledgement:
  17  *      This product includes software developed by Marcus Comstedt.
  18  * 4. Neither the name of The NetBSD Foundation nor the names of its
  19  *    contributors may be used to endorse or promote products derived
  20  *    from this software without specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
  23  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  24  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  25  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  26  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  27  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  28  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  29  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  30  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  31  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  32  * POSSIBILITY OF SUCH DAMAGE.
  33  */
  34
  35 #include <sys/cdefs.h>                  /* RCS ID & Copyright macro defns */
  36 __KERNEL_RCSID(0, "$NetBSD: gapspci.c,v 1.15 2006/08/07 17:36:53 tsutsui Exp $");
  37
  38 #include <sys/param.h>
  39 #include <sys/systm.h>
  40 #include <sys/kernel.h>
  41 #include <sys/device.h>
  42 #include <sys/malloc.h>
  43 #include <sys/conf.h>
  44 #include <sys/mbuf.h>
  45
  46 #include <machine/cpu.h>
  47 #include <machine/bus.h>
  48
  49 #include <dev/pci/pcivar.h>
  50 #include <dev/pci/pcireg.h>
  51
  52 #include <dev/pci/pcidevs.h>
  53
  54 #include <dreamcast/dev/g2/g2busvar.h>
  55 #include <dreamcast/dev/g2/gapspcivar.h>
  56
  57 int     gaps_match(struct device *, struct cfdata *, void *);
  58 void    gaps_attach(struct device *, struct device *, void *);
  59
  60 CFATTACH_DECL(gapspci, sizeof(struct gaps_softc),
  61     gaps_match, gaps_attach, NULL, NULL);
  62
  63 int
  64 gaps_match(struct device *parent, struct cfdata *match, void *aux)
  65 {
  66         struct g2bus_attach_args *ga = aux;
  67         uint8_t idbuf[16];
  68         bus_space_handle_t tmp_memh;
  69
  70         if (bus_space_map(ga->ga_memt, 0x01001400, 0x100, 0, &tmp_memh) != 0)
  71                 return 0;
  72
  73         bus_space_read_region_1(ga->ga_memt, tmp_memh, 0, idbuf, sizeof(idbuf));
  74
  75         bus_space_unmap(ga->ga_memt, tmp_memh, 0x100);
  76
  77         if (strncmp((const char *)idbuf, "GAPSPCI_BRIDGE_2", 16))
  78                 return 0;
  79
  80         return 1;
  81 }
  82
  83 void
  84 gaps_attach(struct device *parent, struct device *self, void *aux)
  85 {
  86         struct g2bus_attach_args *ga = aux;
  87         struct gaps_softc *sc = (void *) self;
  88         struct pcibus_attach_args pba;
  89         int i;
  90
  91         printf(": SEGA GAPS PCI Bridge\n");
  92
  93         sc->sc_memt = ga->ga_memt;
  94
  95         sc->sc_dmabase = 0x1840000;
  96         sc->sc_dmasize = 32768;
  97
  98         if (bus_space_map(sc->sc_memt, 0x01001400, 0x100,
  99             0, &sc->sc_gaps_memh) != 0)
 100                 panic("gaps_attach: can't map GAPS register space");
 101
 102         bus_space_write_4(sc->sc_memt, sc->sc_gaps_memh, 0x18, 0x5a14a501);
 103
 104         for (i = 0; i < 1000000; i++)
 105                 ;
 106
 107         if (bus_space_read_4(sc->sc_memt, sc->sc_gaps_memh, 0x18) != 1)
 108                 panic("gaps_attach: GAPS PCI bridge not responding");
 109
 110         bus_space_write_4(sc->sc_memt, sc->sc_gaps_memh, 0x20, 0x1000000);
 111         bus_space_write_4(sc->sc_memt, sc->sc_gaps_memh, 0x24, 0x1000000);
 112         bus_space_write_4(sc->sc_memt, sc->sc_gaps_memh, 0x28, sc->sc_dmabase);
 113         bus_space_write_4(sc->sc_memt, sc->sc_gaps_memh, 0x2c,
 114             sc->sc_dmabase + sc->sc_dmasize);
 115         bus_space_write_4(sc->sc_memt, sc->sc_gaps_memh, 0x14, 1);
 116         bus_space_write_4(sc->sc_memt, sc->sc_gaps_memh, 0x34, 1);
 117
 118         gaps_pci_init(sc);
 119         gaps_dma_init(sc);
 120
 121         memset(&pba, 0, sizeof(pba));
 122
 123         pba.pba_memt = sc->sc_memt;
 124         pba.pba_dmat = &sc->sc_dmat;
 125         pba.pba_dmat64 = NULL;
 126         pba.pba_bus = 0;
 127         pba.pba_bridgetag = NULL;
 128         pba.pba_flags = PCI_FLAGS_MEM_ENABLED;
 129         pba.pba_pc = &sc->sc_pc;
 130
 131         (void)config_found_ia(self, "pcibus", &pba, pcibusprint);
 132 }