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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 | /* * Copyright (C) 1999, 2000, 2004 MIPS Technologies, Inc. * All rights reserved. * Authors: Carsten Langgaard <carstenl@mips.com> * Maciej W. Rozycki <macro@mips.com> * * This program is free software; you can distribute it and/or modify it * under the terms of the GNU General Public License (Version 2) as * published by the Free Software Foundation. * * This program is distributed in the hope it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * for more details. * * You should have received a copy of the GNU General Public License along * with this program; if not, write to the Free Software Foundation, Inc., * 59 Temple Place - Suite 330, Boston MA 02111-1307, USA. */ #include <linux/types.h> #include <linux/pci.h> #include <linux/kernel.h> #include <asm/gt64120.h> #define PCI_ACCESS_READ 0 #define PCI_ACCESS_WRITE 1 /* * PCI configuration cycle AD bus definition */ /* Type 0 */ #define PCI_CFG_TYPE0_REG_SHF 0 #define PCI_CFG_TYPE0_FUNC_SHF 8 /* Type 1 */ #define PCI_CFG_TYPE1_REG_SHF 0 #define PCI_CFG_TYPE1_FUNC_SHF 8 #define PCI_CFG_TYPE1_DEV_SHF 11 #define PCI_CFG_TYPE1_BUS_SHF 16 static int gt64120_pcibios_config_access(unsigned char access_type, struct pci_bus *bus, unsigned int devfn, int where, u32 * data) { unsigned char busnum = bus->number; u32 intr; if ((busnum == 0) && (devfn >= PCI_DEVFN(31, 0))) return -1; /* Because of a bug in the galileo (for slot 31). */ /* Clear cause register bits */ GT_WRITE(GT_INTRCAUSE_OFS, ~(GT_INTRCAUSE_MASABORT0_BIT | GT_INTRCAUSE_TARABORT0_BIT)); /* Setup address */ GT_WRITE(GT_PCI0_CFGADDR_OFS, (busnum << GT_PCI0_CFGADDR_BUSNUM_SHF) | (devfn << GT_PCI0_CFGADDR_FUNCTNUM_SHF) | ((where / 4) << GT_PCI0_CFGADDR_REGNUM_SHF) | GT_PCI0_CFGADDR_CONFIGEN_BIT); if (access_type == PCI_ACCESS_WRITE) { if (busnum == 0 && PCI_SLOT(devfn) == 0) { /* * The Galileo system controller is acting * differently than other devices. */ GT_WRITE(GT_PCI0_CFGDATA_OFS, *data); } else __GT_WRITE(GT_PCI0_CFGDATA_OFS, *data); } else { if (busnum == 0 && PCI_SLOT(devfn) == 0) { /* * The Galileo system controller is acting * differently than other devices. */ *data = GT_READ(GT_PCI0_CFGDATA_OFS); } else *data = __GT_READ(GT_PCI0_CFGDATA_OFS); } /* Check for master or target abort */ intr = GT_READ(GT_INTRCAUSE_OFS); if (intr & (GT_INTRCAUSE_MASABORT0_BIT | GT_INTRCAUSE_TARABORT0_BIT)) { /* Error occurred */ /* Clear bits */ GT_WRITE(GT_INTRCAUSE_OFS, ~(GT_INTRCAUSE_MASABORT0_BIT | GT_INTRCAUSE_TARABORT0_BIT)); return -1; } return 0; } /* * We can't address 8 and 16 bit words directly. Instead we have to * read/write a 32bit word and mask/modify the data we actually want. */ static int gt64120_pcibios_read(struct pci_bus *bus, unsigned int devfn, int where, int size, u32 * val) { u32 data = 0; if (gt64120_pcibios_config_access(PCI_ACCESS_READ, bus, devfn, where, &data)) return PCIBIOS_DEVICE_NOT_FOUND; if (size == 1) *val = (data >> ((where & 3) << 3)) & 0xff; else if (size == 2) *val = (data >> ((where & 3) << 3)) & 0xffff; else *val = data; return PCIBIOS_SUCCESSFUL; } static int gt64120_pcibios_write(struct pci_bus *bus, unsigned int devfn, int where, int size, u32 val) { u32 data = 0; if (size == 4) data = val; else { if (gt64120_pcibios_config_access(PCI_ACCESS_READ, bus, devfn, where, &data)) return PCIBIOS_DEVICE_NOT_FOUND; if (size == 1) data = (data & ~(0xff << ((where & 3) << 3))) | (val << ((where & 3) << 3)); else if (size == 2) data = (data & ~(0xffff << ((where & 3) << 3))) | (val << ((where & 3) << 3)); } if (gt64120_pcibios_config_access(PCI_ACCESS_WRITE, bus, devfn, where, &data)) return PCIBIOS_DEVICE_NOT_FOUND; return PCIBIOS_SUCCESSFUL; } struct pci_ops gt64120_pci_ops = { .read = gt64120_pcibios_read, .write = gt64120_pcibios_write }; |