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
gaps_match(device_t parent,cfdata_t cf,void * aux)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
gaps_attach(device_t parent,device_t self,void * aux)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