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 for (i=0; i<16; i++) 61 idbuf[i] = inb(GAPSPCI_REGS+i); 62 63 if (strncmp(idbuf, "GAPSPCI_BRIDGE_2", 16)) 64 return -ENODEV; 65 66 outl(0x5a14a501, GAPSPCI_REGS+0x18); 67 68 for (i=0; i<1000000; i++) 69 cpu_relax(); 70 71 if (inl(GAPSPCI_REGS+0x18) != 1) 72 return -EINVAL; 73 74 outl(0x01000000, GAPSPCI_REGS+0x20); 75 outl(0x01000000, GAPSPCI_REGS+0x24); 76 77 outl(GAPSPCI_DMA_BASE, GAPSPCI_REGS+0x28); 78 outl(GAPSPCI_DMA_BASE+GAPSPCI_DMA_SIZE, GAPSPCI_REGS+0x2c); 79 80 outl(1, GAPSPCI_REGS+0x14); 81 outl(1, GAPSPCI_REGS+0x34); 82 83 /* Setting Broadband Adapter */ 84 outw(0xf900, GAPSPCI_BBA_CONFIG+0x06); 85 outl(0x00000000, GAPSPCI_BBA_CONFIG+0x30); 86 outb(0x00, GAPSPCI_BBA_CONFIG+0x3c); 87 outb(0xf0, GAPSPCI_BBA_CONFIG+0x0d); 88 outw(0x0006, GAPSPCI_BBA_CONFIG+0x04); 89 outl(0x00002001, GAPSPCI_BBA_CONFIG+0x10); 90 outl(0x01000000, GAPSPCI_BBA_CONFIG+0x14); 91 92 return register_pci_controller(&dreamcast_pci_controller); 93} 94arch_initcall(gapspci_init); 95