1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * PCI support for the Sega Dreamcast
4*4882a593Smuzhiyun *
5*4882a593Smuzhiyun * Copyright (C) 2001, 2002 M. R. Brown
6*4882a593Smuzhiyun * Copyright (C) 2002, 2003 Paul Mundt
7*4882a593Smuzhiyun *
8*4882a593Smuzhiyun * This file originally bore the message (with enclosed-$):
9*4882a593Smuzhiyun * Id: pci.c,v 1.3 2003/05/04 19:29:46 lethal Exp
10*4882a593Smuzhiyun * Dreamcast PCI: Supports SEGA Broadband Adaptor only.
11*4882a593Smuzhiyun */
12*4882a593Smuzhiyun
13*4882a593Smuzhiyun #include <linux/sched.h>
14*4882a593Smuzhiyun #include <linux/kernel.h>
15*4882a593Smuzhiyun #include <linux/param.h>
16*4882a593Smuzhiyun #include <linux/interrupt.h>
17*4882a593Smuzhiyun #include <linux/init.h>
18*4882a593Smuzhiyun #include <linux/irq.h>
19*4882a593Smuzhiyun #include <linux/pci.h>
20*4882a593Smuzhiyun #include <linux/module.h>
21*4882a593Smuzhiyun #include <asm/io.h>
22*4882a593Smuzhiyun #include <asm/irq.h>
23*4882a593Smuzhiyun #include <mach/pci.h>
24*4882a593Smuzhiyun
25*4882a593Smuzhiyun static struct resource gapspci_resources[] = {
26*4882a593Smuzhiyun {
27*4882a593Smuzhiyun .name = "GAPSPCI IO",
28*4882a593Smuzhiyun .start = GAPSPCI_BBA_CONFIG,
29*4882a593Smuzhiyun .end = GAPSPCI_BBA_CONFIG + GAPSPCI_BBA_CONFIG_SIZE - 1,
30*4882a593Smuzhiyun .flags = IORESOURCE_IO,
31*4882a593Smuzhiyun }, {
32*4882a593Smuzhiyun .name = "GAPSPCI mem",
33*4882a593Smuzhiyun .start = GAPSPCI_DMA_BASE,
34*4882a593Smuzhiyun .end = GAPSPCI_DMA_BASE + GAPSPCI_DMA_SIZE - 1,
35*4882a593Smuzhiyun .flags = IORESOURCE_MEM,
36*4882a593Smuzhiyun },
37*4882a593Smuzhiyun };
38*4882a593Smuzhiyun
39*4882a593Smuzhiyun static struct pci_channel dreamcast_pci_controller = {
40*4882a593Smuzhiyun .pci_ops = &gapspci_pci_ops,
41*4882a593Smuzhiyun .resources = gapspci_resources,
42*4882a593Smuzhiyun .nr_resources = ARRAY_SIZE(gapspci_resources),
43*4882a593Smuzhiyun .io_offset = 0x00000000,
44*4882a593Smuzhiyun .mem_offset = 0x00000000,
45*4882a593Smuzhiyun };
46*4882a593Smuzhiyun
47*4882a593Smuzhiyun /*
48*4882a593Smuzhiyun * gapspci init
49*4882a593Smuzhiyun */
50*4882a593Smuzhiyun
gapspci_init(void)51*4882a593Smuzhiyun static int __init gapspci_init(void)
52*4882a593Smuzhiyun {
53*4882a593Smuzhiyun char idbuf[16];
54*4882a593Smuzhiyun int i;
55*4882a593Smuzhiyun
56*4882a593Smuzhiyun /*
57*4882a593Smuzhiyun * FIXME: All of this wants documenting to some degree,
58*4882a593Smuzhiyun * even some basic register definitions would be nice.
59*4882a593Smuzhiyun *
60*4882a593Smuzhiyun * I haven't seen anything this ugly since.. maple.
61*4882a593Smuzhiyun */
62*4882a593Smuzhiyun
63*4882a593Smuzhiyun for (i=0; i<16; i++)
64*4882a593Smuzhiyun idbuf[i] = inb(GAPSPCI_REGS+i);
65*4882a593Smuzhiyun
66*4882a593Smuzhiyun if (strncmp(idbuf, "GAPSPCI_BRIDGE_2", 16))
67*4882a593Smuzhiyun return -ENODEV;
68*4882a593Smuzhiyun
69*4882a593Smuzhiyun outl(0x5a14a501, GAPSPCI_REGS+0x18);
70*4882a593Smuzhiyun
71*4882a593Smuzhiyun for (i=0; i<1000000; i++)
72*4882a593Smuzhiyun cpu_relax();
73*4882a593Smuzhiyun
74*4882a593Smuzhiyun if (inl(GAPSPCI_REGS+0x18) != 1)
75*4882a593Smuzhiyun return -EINVAL;
76*4882a593Smuzhiyun
77*4882a593Smuzhiyun outl(0x01000000, GAPSPCI_REGS+0x20);
78*4882a593Smuzhiyun outl(0x01000000, GAPSPCI_REGS+0x24);
79*4882a593Smuzhiyun
80*4882a593Smuzhiyun outl(GAPSPCI_DMA_BASE, GAPSPCI_REGS+0x28);
81*4882a593Smuzhiyun outl(GAPSPCI_DMA_BASE+GAPSPCI_DMA_SIZE, GAPSPCI_REGS+0x2c);
82*4882a593Smuzhiyun
83*4882a593Smuzhiyun outl(1, GAPSPCI_REGS+0x14);
84*4882a593Smuzhiyun outl(1, GAPSPCI_REGS+0x34);
85*4882a593Smuzhiyun
86*4882a593Smuzhiyun /* Setting Broadband Adapter */
87*4882a593Smuzhiyun outw(0xf900, GAPSPCI_BBA_CONFIG+0x06);
88*4882a593Smuzhiyun outl(0x00000000, GAPSPCI_BBA_CONFIG+0x30);
89*4882a593Smuzhiyun outb(0x00, GAPSPCI_BBA_CONFIG+0x3c);
90*4882a593Smuzhiyun outb(0xf0, GAPSPCI_BBA_CONFIG+0x0d);
91*4882a593Smuzhiyun outw(0x0006, GAPSPCI_BBA_CONFIG+0x04);
92*4882a593Smuzhiyun outl(0x00002001, GAPSPCI_BBA_CONFIG+0x10);
93*4882a593Smuzhiyun outl(0x01000000, GAPSPCI_BBA_CONFIG+0x14);
94*4882a593Smuzhiyun
95*4882a593Smuzhiyun return register_pci_controller(&dreamcast_pci_controller);
96*4882a593Smuzhiyun }
97*4882a593Smuzhiyun arch_initcall(gapspci_init);
98