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 30 static 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 37 static 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 44 static struct pci_ops gapspci_pci_ops; 45 46 struct 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 */ 68 static 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 */ 78 static 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 94 static 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 } 107 108 static struct pci_ops gapspci_pci_ops = { 109 .read = gapspci_read, 110 .write = gapspci_write, 111 }; 112 113 /* 114 * gapspci init 115 */ 116 117 int __init gapspci_init(void) 118 { 119 char idbuf[16]; 120 int i; 121 122 /* 123 * FIXME: All of this wants documenting to some degree, 124 * even some basic register definitions would be nice. 125 * 126 * I haven't seen anything this ugly since.. maple. 127 */ 128 129 for (i=0; i<16; i++) 130 idbuf[i] = inb(GAPSPCI_REGS+i); 131 132 if (strncmp(idbuf, "GAPSPCI_BRIDGE_2", 16)) 133 return -ENODEV; 134 135 outl(0x5a14a501, GAPSPCI_REGS+0x18); 136 137 for (i=0; i<1000000; i++) 138 ; 139 140 if (inl(GAPSPCI_REGS+0x18) != 1) 141 return -EINVAL; 142 143 outl(0x01000000, GAPSPCI_REGS+0x20); 144 outl(0x01000000, GAPSPCI_REGS+0x24); 145 146 outl(GAPSPCI_DMA_BASE, GAPSPCI_REGS+0x28); 147 outl(GAPSPCI_DMA_BASE+GAPSPCI_DMA_SIZE, GAPSPCI_REGS+0x2c); 148 149 outl(1, GAPSPCI_REGS+0x14); 150 outl(1, GAPSPCI_REGS+0x34); 151 152 /* Setting Broadband Adapter */ 153 outw(0xf900, GAPSPCI_BBA_CONFIG+0x06); 154 outl(0x00000000, GAPSPCI_BBA_CONFIG+0x30); 155 outb(0x00, GAPSPCI_BBA_CONFIG+0x3c); 156 outb(0xf0, GAPSPCI_BBA_CONFIG+0x0d); 157 outw(0x0006, GAPSPCI_BBA_CONFIG+0x04); 158 outl(0x00002001, GAPSPCI_BBA_CONFIG+0x10); 159 outl(0x01000000, GAPSPCI_BBA_CONFIG+0x14); 160 161 return 0; 162 } 163 164 /* Haven't done anything here as yet */ 165 char * __devinit pcibios_setup(char *str) 166 { 167 return str; 168 } 169