1 /* $NetBSD: gapspci.c,v 1.21 2021/08/07 16:18:48 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 1.21 2021/08/07 16:18:48 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/malloc.h> 43 #include <sys/conf.h> 44 #include <sys/mbuf.h> 45 #include <sys/bus.h> 46 47 #include <machine/cpu.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(device_t, cfdata_t, void *); 58 void gaps_attach(device_t, device_t, void *); 59 60 CFATTACH_DECL_NEW(gapspci, sizeof(struct gaps_softc), 61 gaps_match, gaps_attach, NULL, NULL); 62 63 int 64 gaps_match(device_t parent, cfdata_t cf, 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(device_t parent, device_t self, void *aux) 85 { 86 struct g2bus_attach_args *ga = aux; 87 struct gaps_softc *sc = device_private(self); 88 struct pcibus_attach_args pba; 89 int i; 90 91 printf(": SEGA GAPS PCI Bridge\n"); 92 93 sc->sc_dev = self; 94 sc->sc_memt = ga->ga_memt; 95 96 sc->sc_dmabase = 0x1840000; 97 sc->sc_dmasize = 32768; 98 99 if (bus_space_map(sc->sc_memt, 0x01001400, 0x100, 100 0, &sc->sc_gaps_memh) != 0) 101 panic("gaps_attach: can't map GAPS register space"); 102 103 bus_space_write_4(sc->sc_memt, sc->sc_gaps_memh, 0x18, 0x5a14a501); 104 105 for (i = 0; i < 1000000; i++) 106 ; 107 108 if (bus_space_read_4(sc->sc_memt, sc->sc_gaps_memh, 0x18) != 1) 109 panic("gaps_attach: GAPS PCI bridge not responding"); 110 111 bus_space_write_4(sc->sc_memt, sc->sc_gaps_memh, 0x20, 0x1000000); 112 bus_space_write_4(sc->sc_memt, sc->sc_gaps_memh, 0x24, 0x1000000); 113 bus_space_write_4(sc->sc_memt, sc->sc_gaps_memh, 0x28, sc->sc_dmabase); 114 bus_space_write_4(sc->sc_memt, sc->sc_gaps_memh, 0x2c, 115 sc->sc_dmabase + sc->sc_dmasize); 116 bus_space_write_4(sc->sc_memt, sc->sc_gaps_memh, 0x14, 1); 117 bus_space_write_4(sc->sc_memt, sc->sc_gaps_memh, 0x34, 1); 118 119 gaps_pci_init(sc); 120 gaps_dma_init(sc); 121 122 memset(&pba, 0, sizeof(pba)); 123 124 pba.pba_memt = sc->sc_memt; 125 pba.pba_dmat = &sc->sc_dmat; 126 pba.pba_dmat64 = NULL; 127 pba.pba_bus = 0; 128 pba.pba_bridgetag = NULL; 129 pba.pba_flags = PCI_FLAGS_MEM_OKAY; 130 pba.pba_pc = &sc->sc_pc; 131 132 config_found(self, &pba, pcibusprint, CFARGS_NONE); 133 } 134