1/*
2 * arch/sh/drivers/pci/ops-dreamcast.c
3 *
4 * PCI operations for the Sega Dreamcast
5 *
6 * Copyright (C) 2001, 2002  M. R. Brown
7 * Copyright (C) 2002, 2003  Paul Mundt
8 *
9 * This file originally bore the message (with enclosed-$):
10 *	Id: pci.c,v 1.3 2003/05/04 19:29:46 lethal Exp
11 *	Dreamcast PCI: Supports SEGA Broadband Adaptor only.
12 *
13 * This file is subject to the terms and conditions of the GNU General Public
14 * License.  See the file "COPYING" in the main directory of this archive
15 * for more details.
16 */
17
18#include <linux/sched.h>
19#include <linux/kernel.h>
20#include <linux/param.h>
21#include <linux/interrupt.h>
22#include <linux/init.h>
23#include <linux/irq.h>
24#include <linux/pci.h>
25
26#include <asm/io.h>
27#include <asm/irq.h>
28#include <asm/mach/pci.h>
29
30static struct resource gapspci_io_resource = {
31	.name	= "GAPSPCI IO",
32	.start	= GAPSPCI_BBA_CONFIG,
33	.end	= GAPSPCI_BBA_CONFIG + GAPSPCI_BBA_CONFIG_SIZE - 1,
34	.flags	= IORESOURCE_IO,
35};
36
37static struct resource gapspci_mem_resource = {
38	.name	= "GAPSPCI mem",
39	.start	= GAPSPCI_DMA_BASE,
40	.end	= GAPSPCI_DMA_BASE + GAPSPCI_DMA_SIZE - 1,
41	.flags	= IORESOURCE_MEM,
42};
43
44static struct pci_ops gapspci_pci_ops;
45
46struct pci_channel board_pci_channels[] = {
47	{ &gapspci_pci_ops, &gapspci_io_resource,
48	  &gapspci_mem_resource, 0, 1 },
49	{ 0, }
50};
51
52/*
53 * The !gapspci_config_access case really shouldn't happen, ever, unless
54 * someone implicitly messes around with the last devfn value.. otherwise we
55 * only support a single device anyways, and if we didn't have a BBA, we
56 * wouldn't make it terribly far through the PCI setup anyways.
57 *
58 * Also, we could very easily support both Type 0 and Type 1 configurations
59 * here, but since it doesn't seem that there is any such implementation in
60 * existence, we don't bother.
61 *
62 * I suppose if someone actually gets around to ripping the chip out of
63 * the BBA and hanging some more devices off of it, then this might be
64 * something to take into consideration. However, due to the cost of the BBA,
65 * and the general lack of activity by DC hardware hackers, this doesn't seem
66 * likely to happen anytime soon.
67 */
68static int gapspci_config_access(unsigned char bus, unsigned int devfn)
69{
70	return (bus == 0) && (devfn == 0);
71}
72
73/*
74 * We can also actually read and write in b/w/l sizes! Thankfully this part
75 * was at least done right, and we don't have to do the stupid masking and
76 * shifting that we do on the 7751! Small wonders never cease to amaze.
77 */
78static int gapspci_read(struct pci_bus *bus, unsigned int devfn, int where, int size, u32 *val)
79{
80	*val = 0xffffffff;
81
82	if (!gapspci_config_access(bus->number, devfn))
83		return PCIBIOS_DEVICE_NOT_FOUND;
84
85	switch (size) {
86		case 1: *val = inb(GAPSPCI_BBA_CONFIG+where); break;
87		case 2: *val = inw(GAPSPCI_BBA_CONFIG+where); break;
88		case 4: *val = inl(GAPSPCI_BBA_CONFIG+where); break;
89	}
90
91        return PCIBIOS_SUCCESSFUL;
92}
93
94static int gapspci_write(struct pci_bus *bus, unsigned int devfn, int where, int size, u32 val)
95{
96	if (!gapspci_config_access(bus->number, devfn))
97		return PCIBIOS_DEVICE_NOT_FOUND;
98
99	switch (size) {
100		case 1: outb(( u8)val, GAPSPCI_BBA_CONFIG+where); break;
101		case 2: outw((u16)val, GAPSPCI_BBA_CONFIG+where); break;
102		case 4: outl((u32)val, GAPSPCI_BBA_CONFIG+where); break;
103	}
104
105        return PCIBIOS_SUCCESSFUL;
106}
107
108static struct pci_ops gapspci_pci_ops = {
109	.read	= gapspci_read,
110	.write	= gapspci_write,
111};
112
113/*
114 * gapspci init
115 */
116
117int __init gapspci_init(void)
118{
119	char idbuf[16];
120	int i;
121
122
123	for (i=0; i<16; i++)
124		idbuf[i] = inb(GAPSPCI_REGS+i);
125
126	if (strncmp(idbuf, "GAPSPCI_BRIDGE_2", 16))
127		return -ENODEV;
128
129	outl(0x5a14a501, GAPSPCI_REGS+0x18);
130
131	for (i=0; i<1000000; i++)
132		;
133
134	if (inl(GAPSPCI_REGS+0x18) != 1)
135		return -EINVAL;
136
137	outl(0x01000000, GAPSPCI_REGS+0x20);
138	outl(0x01000000, GAPSPCI_REGS+0x24);
139
140	outl(GAPSPCI_DMA_BASE, GAPSPCI_REGS+0x28);
141	outl(GAPSPCI_DMA_BASE+GAPSPCI_DMA_SIZE, GAPSPCI_REGS+0x2c);
142
143	outl(1, GAPSPCI_REGS+0x14);
144	outl(1, GAPSPCI_REGS+0x34);
145
146	/* Setting Broadband Adapter */
147	outw(0xf900, GAPSPCI_BBA_CONFIG+0x06);
148	outl(0x00000000, GAPSPCI_BBA_CONFIG+0x30);
149	outb(0x00, GAPSPCI_BBA_CONFIG+0x3c);
150	outb(0xf0, GAPSPCI_BBA_CONFIG+0x0d);
151	outw(0x0006, GAPSPCI_BBA_CONFIG+0x04);
152	outl(0x00002001, GAPSPCI_BBA_CONFIG+0x10);
153	outl(0x01000000, GAPSPCI_BBA_CONFIG+0x14);
154
155	return 0;
156}
157
158/* Haven't done anything here as yet */
159char * __devinit pcibios_setup(char *str)
160{
161	return str;
162}
163