2 * arch/sh/drivers/pci/ops-dreamcast.c
4 * PCI operations for the Sega Dreamcast
6 * Copyright (C) 2001, 2002 M. R. Brown
7 * Copyright (C) 2002, 2003 Paul Mundt
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.
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
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 #include <linux/module.h>
31 static struct resource gapspci_io_resource = {
33 .start = GAPSPCI_BBA_CONFIG,
34 .end = GAPSPCI_BBA_CONFIG + GAPSPCI_BBA_CONFIG_SIZE - 1,
35 .flags = IORESOURCE_IO,
38 static struct resource gapspci_mem_resource = {
39 .name = "GAPSPCI mem",
40 .start = GAPSPCI_DMA_BASE,
41 .end = GAPSPCI_DMA_BASE + GAPSPCI_DMA_SIZE - 1,
42 .flags = IORESOURCE_MEM,
46 * The !gapspci_config_access case really shouldn't happen, ever, unless
47 * someone implicitly messes around with the last devfn value.. otherwise we
48 * only support a single device anyways, and if we didn't have a BBA, we
49 * wouldn't make it terribly far through the PCI setup anyways.
51 * Also, we could very easily support both Type 0 and Type 1 configurations
52 * here, but since it doesn't seem that there is any such implementation in
53 * existence, we don't bother.
55 * I suppose if someone actually gets around to ripping the chip out of
56 * the BBA and hanging some more devices off of it, then this might be
57 * something to take into consideration. However, due to the cost of the BBA,
58 * and the general lack of activity by DC hardware hackers, this doesn't seem
59 * likely to happen anytime soon.
61 static int gapspci_config_access(unsigned char bus, unsigned int devfn)
63 return (bus == 0) && (devfn == 0);
67 * We can also actually read and write in b/w/l sizes! Thankfully this part
68 * was at least done right, and we don't have to do the stupid masking and
69 * shifting that we do on the 7751! Small wonders never cease to amaze.
71 static int gapspci_read(struct pci_bus *bus, unsigned int devfn, int where, int size, u32 *val)
75 if (!gapspci_config_access(bus->number, devfn))
76 return PCIBIOS_DEVICE_NOT_FOUND;
79 case 1: *val = inb(GAPSPCI_BBA_CONFIG+where); break;
80 case 2: *val = inw(GAPSPCI_BBA_CONFIG+where); break;
81 case 4: *val = inl(GAPSPCI_BBA_CONFIG+where); break;
84 return PCIBIOS_SUCCESSFUL;
87 static int gapspci_write(struct pci_bus *bus, unsigned int devfn, int where, int size, u32 val)
89 if (!gapspci_config_access(bus->number, devfn))
90 return PCIBIOS_DEVICE_NOT_FOUND;
93 case 1: outb(( u8)val, GAPSPCI_BBA_CONFIG+where); break;
94 case 2: outw((u16)val, GAPSPCI_BBA_CONFIG+where); break;
95 case 4: outl((u32)val, GAPSPCI_BBA_CONFIG+where); break;
98 return PCIBIOS_SUCCESSFUL;
101 static struct pci_ops gapspci_pci_ops = {
102 .read = gapspci_read,
103 .write = gapspci_write,
110 static int __init gapspci_init(struct pci_channel *chan)
116 * FIXME: All of this wants documenting to some degree,
117 * even some basic register definitions would be nice.
119 * I haven't seen anything this ugly since.. maple.
123 idbuf[i] = inb(GAPSPCI_REGS+i);
125 if (strncmp(idbuf, "GAPSPCI_BRIDGE_2", 16))
128 outl(0x5a14a501, GAPSPCI_REGS+0x18);
130 for (i=0; i<1000000; i++)
133 if (inl(GAPSPCI_REGS+0x18) != 1)
136 outl(0x01000000, GAPSPCI_REGS+0x20);
137 outl(0x01000000, GAPSPCI_REGS+0x24);
139 outl(GAPSPCI_DMA_BASE, GAPSPCI_REGS+0x28);
140 outl(GAPSPCI_DMA_BASE+GAPSPCI_DMA_SIZE, GAPSPCI_REGS+0x2c);
142 outl(1, GAPSPCI_REGS+0x14);
143 outl(1, GAPSPCI_REGS+0x34);
145 /* Setting Broadband Adapter */
146 outw(0xf900, GAPSPCI_BBA_CONFIG+0x06);
147 outl(0x00000000, GAPSPCI_BBA_CONFIG+0x30);
148 outb(0x00, GAPSPCI_BBA_CONFIG+0x3c);
149 outb(0xf0, GAPSPCI_BBA_CONFIG+0x0d);
150 outw(0x0006, GAPSPCI_BBA_CONFIG+0x04);
151 outl(0x00002001, GAPSPCI_BBA_CONFIG+0x10);
152 outl(0x01000000, GAPSPCI_BBA_CONFIG+0x14);
157 /* Haven't done anything here as yet */
158 char * __devinit pcibios_setup(char *str)
163 struct pci_channel board_pci_channels[] = {
164 { gapspci_init, &gapspci_pci_ops, &gapspci_io_resource,
165 &gapspci_mem_resource, 0, 1 },
168 EXPORT_SYMBOL(board_pci_channels);