| Paul Mundt | 3444f5e | 2009-04-20 20:22:05 +0900 | [diff] [blame^] | 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 | |
| 25 | #include <asm/io.h> |
| 26 | #include <asm/irq.h> |
| 27 | #include <mach/pci.h> |
| 28 | |
| 29 | static struct resource gapspci_io_resource = { |
| 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 | |
| 36 | static struct resource gapspci_mem_resource = { |
| 37 | .name = "GAPSPCI mem", |
| 38 | .start = GAPSPCI_DMA_BASE, |
| 39 | .end = GAPSPCI_DMA_BASE + GAPSPCI_DMA_SIZE - 1, |
| 40 | .flags = IORESOURCE_MEM, |
| 41 | }; |
| 42 | |
| 43 | /* |
| 44 | * gapspci init |
| 45 | */ |
| 46 | |
| 47 | static int __init gapspci_init(struct pci_channel *chan) |
| 48 | { |
| 49 | char idbuf[16]; |
| 50 | int i; |
| 51 | |
| 52 | /* |
| 53 | * FIXME: All of this wants documenting to some degree, |
| 54 | * even some basic register definitions would be nice. |
| 55 | * |
| 56 | * I haven't seen anything this ugly since.. maple. |
| 57 | */ |
| 58 | |
| 59 | for (i=0; i<16; i++) |
| 60 | idbuf[i] = inb(GAPSPCI_REGS+i); |
| 61 | |
| 62 | if (strncmp(idbuf, "GAPSPCI_BRIDGE_2", 16)) |
| 63 | return -ENODEV; |
| 64 | |
| 65 | outl(0x5a14a501, GAPSPCI_REGS+0x18); |
| 66 | |
| 67 | for (i=0; i<1000000; i++) |
| 68 | cpu_relax(); |
| 69 | |
| 70 | if (inl(GAPSPCI_REGS+0x18) != 1) |
| 71 | return -EINVAL; |
| 72 | |
| 73 | outl(0x01000000, GAPSPCI_REGS+0x20); |
| 74 | outl(0x01000000, GAPSPCI_REGS+0x24); |
| 75 | |
| 76 | outl(GAPSPCI_DMA_BASE, GAPSPCI_REGS+0x28); |
| 77 | outl(GAPSPCI_DMA_BASE+GAPSPCI_DMA_SIZE, GAPSPCI_REGS+0x2c); |
| 78 | |
| 79 | outl(1, GAPSPCI_REGS+0x14); |
| 80 | outl(1, GAPSPCI_REGS+0x34); |
| 81 | |
| 82 | /* Setting Broadband Adapter */ |
| 83 | outw(0xf900, GAPSPCI_BBA_CONFIG+0x06); |
| 84 | outl(0x00000000, GAPSPCI_BBA_CONFIG+0x30); |
| 85 | outb(0x00, GAPSPCI_BBA_CONFIG+0x3c); |
| 86 | outb(0xf0, GAPSPCI_BBA_CONFIG+0x0d); |
| 87 | outw(0x0006, GAPSPCI_BBA_CONFIG+0x04); |
| 88 | outl(0x00002001, GAPSPCI_BBA_CONFIG+0x10); |
| 89 | outl(0x01000000, GAPSPCI_BBA_CONFIG+0x14); |
| 90 | |
| 91 | return 0; |
| 92 | } |
| 93 | |
| 94 | struct pci_channel board_pci_channels[] = { |
| 95 | { |
| 96 | .init = gapspci_init, |
| 97 | .pci_ops = &gapspci_pci_ops, |
| 98 | .io_resource = &gapspci_io_resource, |
| 99 | .mem_resource = &gapspci_mem_resource, |
| 100 | .first_devfn = 0, |
| 101 | .last_devfn = 1, |
| 102 | }, { |
| 103 | .init = NULL, |
| 104 | } |
| 105 | }; |