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gapspci.c revision 1.6 
      1 /*	$NetBSD: gapspci.c,v 1.6 2002/10/01 03:04:43 thorpej 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 
     37 #include <sys/param.h>
     38 #include <sys/systm.h>
     39 #include <sys/kernel.h>
     40 #include <sys/device.h>
     41 #include <sys/malloc.h>
     42 #include <sys/conf.h>
     43 #include <sys/mbuf.h>
     44 
     45 #include <machine/cpu.h>
     46 #include <machine/bus.h>
     47 
     48 #include <dev/pci/pcivar.h>
     49 #include <dev/pci/pcireg.h>
     50 
     51 #include <dev/pci/pcidevs.h>
     52 
     53 #include <dreamcast/dev/g2/g2busvar.h>
     54 #include <dreamcast/dev/g2/gapspcivar.h>
     55 
     56 int	gaps_match(struct device *, struct cfdata *, void *);
     57 void	gaps_attach(struct device *, struct device *, void *);
     58 
     59 int	gaps_print(void *, const char *);
     60 
     61 CFATTACH_DECL(gapspci, sizeof(struct gaps_softc),
     62     gaps_match, gaps_attach, NULL)
     63 
     64 int
     65 gaps_match(struct device *parent, struct cfdata *match, void *aux)
     66 {
     67   	struct g2bus_attach_args *ga = aux;
     68 	char idbuf[16];
     69 	bus_space_handle_t tmp_memh;
     70 
     71 	if (bus_space_map(ga->ga_memt, 0x01001400, 0x100, 0, &tmp_memh) != 0)
     72 		return 0;
     73 
     74 	bus_space_read_region_1(ga->ga_memt, tmp_memh, 0,
     75 				idbuf, sizeof(idbuf));
     76 
     77 	bus_space_unmap(ga->ga_memt, tmp_memh, 0x100);
     78 
     79 	if(strncmp(idbuf, "GAPSPCI_BRIDGE_2", 16))
     80 		return 0;
     81 
     82 	return (1);
     83 }
     84 
     85 void
     86 gaps_attach(struct device *parent, struct device *self, void *aux)
     87 {
     88 	struct g2bus_attach_args *ga = aux;
     89 	struct gaps_softc *sc = (void *) self;
     90 	struct pcibus_attach_args pba;
     91 	int i;
     92 
     93 	printf(": SEGA GAPS PCI Bridge\n");
     94 
     95 	sc->sc_memt = ga->ga_memt;
     96 
     97 	sc->sc_dmabase = 0x1840000;
     98 	sc->sc_dmasize = 32768;
     99 
    100 	if (bus_space_map(sc->sc_memt, 0x01001400, 0x100,
    101 			  0, &sc->sc_gaps_memh) != 0)
    102 		panic("gaps_attach: can't map GAPS register space");
    103 
    104 	bus_space_write_4(sc->sc_memt, sc->sc_gaps_memh, 0x18, 0x5a14a501);
    105 
    106 	for(i=0; i<1000000; i++)
    107 	  ;
    108 
    109 	if(bus_space_read_4(sc->sc_memt, sc->sc_gaps_memh, 0x18) != 1)
    110 		panic("gaps_attach: GAPS PCI bridge not responding");
    111 
    112 	bus_space_write_4(sc->sc_memt, sc->sc_gaps_memh, 0x20, 0x1000000);
    113 	bus_space_write_4(sc->sc_memt, sc->sc_gaps_memh, 0x24, 0x1000000);
    114 	bus_space_write_4(sc->sc_memt, sc->sc_gaps_memh, 0x28, sc->sc_dmabase);
    115 	bus_space_write_4(sc->sc_memt, sc->sc_gaps_memh, 0x2c,
    116 			  sc->sc_dmabase + sc->sc_dmasize);
    117 	bus_space_write_4(sc->sc_memt, sc->sc_gaps_memh, 0x14, 1);
    118 	bus_space_write_4(sc->sc_memt, sc->sc_gaps_memh, 0x34, 1);
    119 
    120 	gaps_pci_init(sc);
    121 	gaps_dma_init(sc);
    122 
    123 	memset(&pba, 0, sizeof(pba));
    124 
    125 	pba.pba_busname = "pci";
    126 	pba.pba_memt = sc->sc_memt;
    127 	pba.pba_dmat = &sc->sc_dmat;
    128 	pba.pba_bus = 0;
    129 	pba.pba_bridgetag = NULL;
    130 	pba.pba_flags = PCI_FLAGS_MEM_ENABLED;
    131 	pba.pba_pc = &sc->sc_pc;
    132 
    133 	(void) config_found(self, &pba, gaps_print);
    134 }
    135 
    136 int
    137 gaps_print(void *aux, const char *pnp)
    138 {
    139 	struct pcibus_attach_args *pba = aux;
    140 
    141 	if (pnp)
    142 		printf("%s at %s", pba->pba_busname, pnp);
    143 	printf(" bus %d", pba->pba_bus);
    144 
    145 	return (UNCONF);
    146 }
    147