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