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 
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