1 /*
2 * PCI support for the Sega Dreamcast
3 *
4 * Copyright (C) 2001, 2002 M. R. Brown
5 * Copyright (C) 2002, 2003 Paul Mundt
6 *
7 * This file originally bore the message (with enclosed-$):
8 * Id: pci.c,v 1.3 2003/05/04 19:29:46 lethal Exp
9 * Dreamcast PCI: Supports SEGA Broadband Adaptor only.
10 *
11 * This file is subject to the terms and conditions of the GNU General Public
12 * License. See the file "COPYING" in the main directory of this archive
13 * for more details.
14 */
15
16 #include <linux/sched.h>
17 #include <linux/kernel.h>
18 #include <linux/param.h>
19 #include <linux/interrupt.h>
20 #include <linux/init.h>
21 #include <linux/irq.h>
22 #include <linux/pci.h>
23 #include <linux/module.h>
24 #include <asm/io.h>
25 #include <asm/irq.h>
26 #include <mach/pci.h>
27
28 static struct resource gapspci_resources[] = {
29 {
30 .name = "GAPSPCI IO",
31 .start = GAPSPCI_BBA_CONFIG,
32 .end = GAPSPCI_BBA_CONFIG + GAPSPCI_BBA_CONFIG_SIZE - 1,
33 .flags = IORESOURCE_IO,
34 }, {
35 .name = "GAPSPCI mem",
36 .start = GAPSPCI_DMA_BASE,
37 .end = GAPSPCI_DMA_BASE + GAPSPCI_DMA_SIZE - 1,
38 .flags = IORESOURCE_MEM,
39 },
40 };
41
42 static struct pci_channel dreamcast_pci_controller = {
43 .pci_ops = &gapspci_pci_ops,
44 .resources = gapspci_resources,
45 .nr_resources = ARRAY_SIZE(gapspci_resources),
46 .io_offset = 0x00000000,
47 .mem_offset = 0x00000000,
48 };
49
50 /*
51 * gapspci init
52 */
53
gapspci_init(void)54 static int __init gapspci_init(void)
55 {
56 char idbuf[16];
57 int i;
58
59 /*
60 * FIXME: All of this wants documenting to some degree,
61 * even some basic register definitions would be nice.
62 *
63 * I haven't seen anything this ugly since.. maple.
64 */
65
66 for (i=0; i<16; i++)
67 idbuf[i] = inb(GAPSPCI_REGS+i);
68
69 if (strncmp(idbuf, "GAPSPCI_BRIDGE_2", 16))
70 return -ENODEV;
71
72 outl(0x5a14a501, GAPSPCI_REGS+0x18);
73
74 for (i=0; i<1000000; i++)
75 cpu_relax();
76
77 if (inl(GAPSPCI_REGS+0x18) != 1)
78 return -EINVAL;
79
80 outl(0x01000000, GAPSPCI_REGS+0x20);
81 outl(0x01000000, GAPSPCI_REGS+0x24);
82
83 outl(GAPSPCI_DMA_BASE, GAPSPCI_REGS+0x28);
84 outl(GAPSPCI_DMA_BASE+GAPSPCI_DMA_SIZE, GAPSPCI_REGS+0x2c);
85
86 outl(1, GAPSPCI_REGS+0x14);
87 outl(1, GAPSPCI_REGS+0x34);
88
89 /* Setting Broadband Adapter */
90 outw(0xf900, GAPSPCI_BBA_CONFIG+0x06);
91 outl(0x00000000, GAPSPCI_BBA_CONFIG+0x30);
92 outb(0x00, GAPSPCI_BBA_CONFIG+0x3c);
93 outb(0xf0, GAPSPCI_BBA_CONFIG+0x0d);
94 outw(0x0006, GAPSPCI_BBA_CONFIG+0x04);
95 outl(0x00002001, GAPSPCI_BBA_CONFIG+0x10);
96 outl(0x01000000, GAPSPCI_BBA_CONFIG+0x14);
97
98 return register_pci_controller(&dreamcast_pci_controller);
99 }
100 arch_initcall(gapspci_init);
101