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
28static 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
42static 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
54static 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}
100arch_initcall(gapspci_init);
101