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 #include <linux/module.h> 26 27 #include <asm/io.h> 28 #include <asm/irq.h> 29 #include <mach/pci.h> 30 31 static struct resource gapspci_io_resource = { 32 .name = "GAPSPCI IO", 33 .start = GAPSPCI_BBA_CONFIG, 34 .end = GAPSPCI_BBA_CONFIG + GAPSPCI_BBA_CONFIG_SIZE - 1, 35 .flags = IORESOURCE_IO, 36 }; 37 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, 43 }; 44 45 static struct pci_ops gapspci_pci_ops; 46 47 struct pci_channel board_pci_channels[] = { 48 { &gapspci_pci_ops, &gapspci_io_resource, 49 &gapspci_mem_resource, 0, 1 }, 50 { 0, } 51 }; 52 EXPORT_SYMBOL(board_pci_channels); 53 54 /* 55 * The !gapspci_config_access case really shouldn't happen, ever, unless 56 * someone implicitly messes around with the last devfn value.. otherwise we 57 * only support a single device anyways, and if we didn't have a BBA, we 58 * wouldn't make it terribly far through the PCI setup anyways. 59 * 60 * Also, we could very easily support both Type 0 and Type 1 configurations 61 * here, but since it doesn't seem that there is any such implementation in 62 * existence, we don't bother. 63 * 64 * I suppose if someone actually gets around to ripping the chip out of 65 * the BBA and hanging some more devices off of it, then this might be 66 * something to take into consideration. However, due to the cost of the BBA, 67 * and the general lack of activity by DC hardware hackers, this doesn't seem 68 * likely to happen anytime soon. 69 */ 70 static int gapspci_config_access(unsigned char bus, unsigned int devfn) 71 { 72 return (bus == 0) && (devfn == 0); 73 } 74 75 /* 76 * We can also actually read and write in b/w/l sizes! Thankfully this part 77 * was at least done right, and we don't have to do the stupid masking and 78 * shifting that we do on the 7751! Small wonders never cease to amaze. 79 */ 80 static int gapspci_read(struct pci_bus *bus, unsigned int devfn, int where, int size, u32 *val) 81 { 82 *val = 0xffffffff; 83 84 if (!gapspci_config_access(bus->number, devfn)) 85 return PCIBIOS_DEVICE_NOT_FOUND; 86 87 switch (size) { 88 case 1: *val = inb(GAPSPCI_BBA_CONFIG+where); break; 89 case 2: *val = inw(GAPSPCI_BBA_CONFIG+where); break; 90 case 4: *val = inl(GAPSPCI_BBA_CONFIG+where); break; 91 } 92 93 return PCIBIOS_SUCCESSFUL; 94 } 95 96 static int gapspci_write(struct pci_bus *bus, unsigned int devfn, int where, int size, u32 val) 97 { 98 if (!gapspci_config_access(bus->number, devfn)) 99 return PCIBIOS_DEVICE_NOT_FOUND; 100 101 switch (size) { 102 case 1: outb(( u8)val, GAPSPCI_BBA_CONFIG+where); break; 103 case 2: outw((u16)val, GAPSPCI_BBA_CONFIG+where); break; 104 case 4: outl((u32)val, GAPSPCI_BBA_CONFIG+where); break; 105 } 106 107 return PCIBIOS_SUCCESSFUL; 108 } 109 110 static struct pci_ops gapspci_pci_ops = { 111 .read = gapspci_read, 112 .write = gapspci_write, 113 }; 114 115 /* 116 * gapspci init 117 */ 118 119 int __init gapspci_init(void) 120 { 121 char idbuf[16]; 122 int i; 123 124 /* 125 * FIXME: All of this wants documenting to some degree, 126 * even some basic register definitions would be nice. 127 * 128 * I haven't seen anything this ugly since.. maple. 129 */ 130 131 for (i=0; i<16; i++) 132 idbuf[i] = inb(GAPSPCI_REGS+i); 133 134 if (strncmp(idbuf, "GAPSPCI_BRIDGE_2", 16)) 135 return -ENODEV; 136 137 outl(0x5a14a501, GAPSPCI_REGS+0x18); 138 139 for (i=0; i<1000000; i++) 140 ; 141 142 if (inl(GAPSPCI_REGS+0x18) != 1) 143 return -EINVAL; 144 145 outl(0x01000000, GAPSPCI_REGS+0x20); 146 outl(0x01000000, GAPSPCI_REGS+0x24); 147 148 outl(GAPSPCI_DMA_BASE, GAPSPCI_REGS+0x28); 149 outl(GAPSPCI_DMA_BASE+GAPSPCI_DMA_SIZE, GAPSPCI_REGS+0x2c); 150 151 outl(1, GAPSPCI_REGS+0x14); 152 outl(1, GAPSPCI_REGS+0x34); 153 154 /* Setting Broadband Adapter */ 155 outw(0xf900, GAPSPCI_BBA_CONFIG+0x06); 156 outl(0x00000000, GAPSPCI_BBA_CONFIG+0x30); 157 outb(0x00, GAPSPCI_BBA_CONFIG+0x3c); 158 outb(0xf0, GAPSPCI_BBA_CONFIG+0x0d); 159 outw(0x0006, GAPSPCI_BBA_CONFIG+0x04); 160 outl(0x00002001, GAPSPCI_BBA_CONFIG+0x10); 161 outl(0x01000000, GAPSPCI_BBA_CONFIG+0x14); 162 163 return 0; 164 } 165 166 /* Haven't done anything here as yet */ 167 char * __devinit pcibios_setup(char *str) 168 { 169 return str; 170 } 171