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      1 /*	$NetBSD: gapspci.c,v 1.22 2023/12/20 06:36:03 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 __KERNEL_RCSID(0, "$NetBSD: gapspci.c,v 1.22 2023/12/20 06:36:03 thorpej 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/conf.h>
     43 #include <sys/mbuf.h>
     44 #include <sys/bus.h>
     45 
     46 #include <machine/cpu.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(device_t, cfdata_t, void *);
     57 void	gaps_attach(device_t, device_t, void *);
     58 
     59 CFATTACH_DECL_NEW(gapspci, sizeof(struct gaps_softc),
     60     gaps_match, gaps_attach, NULL, NULL);
     61 
     62 int
     63 gaps_match(device_t parent, cfdata_t cf, void *aux)
     64 {
     65 	struct g2bus_attach_args *ga = aux;
     66 	uint8_t idbuf[16];
     67 	bus_space_handle_t tmp_memh;
     68 
     69 	if (bus_space_map(ga->ga_memt, 0x01001400, 0x100, 0, &tmp_memh) != 0)
     70 		return 0;
     71 
     72 	bus_space_read_region_1(ga->ga_memt, tmp_memh, 0, idbuf, sizeof(idbuf));
     73 
     74 	bus_space_unmap(ga->ga_memt, tmp_memh, 0x100);
     75 
     76 	if (strncmp((const char *)idbuf, "GAPSPCI_BRIDGE_2", 16))
     77 		return 0;
     78 
     79 	return 1;
     80 }
     81 
     82 void
     83 gaps_attach(device_t parent, device_t self, void *aux)
     84 {
     85 	struct g2bus_attach_args *ga = aux;
     86 	struct gaps_softc *sc = device_private(self);
     87 	struct pcibus_attach_args pba;
     88 	int i;
     89 
     90 	printf(": SEGA GAPS PCI Bridge\n");
     91 
     92 	sc->sc_dev = self;
     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_OKAY;
    129 	pba.pba_pc = &sc->sc_pc;
    130 
    131 	config_found(self, &pba, pcibusprint, CFARGS_NONE);
    132 }
    133