1/* 2 * arch/mips/pci/ops-emma2rh.c 3 * This file defines the PCI operation for EMMA2RH. 4 * 5 * Copyright (C) NEC Electronics Corporation 2004-2006 6 * 7 * This file is based on the arch/mips/pci/ops-vr41xx.c 8 * 9 * Copyright 2001 MontaVista Software Inc. 10 * 11 * This program is free software; you can redistribute it and/or modify 12 * it under the terms of the GNU General Public License as published by 13 * the Free Software Foundation; either version 2 of the License, or 14 * (at your option) any later version. 15 * 16 * This program is distributed in the hope that it will be useful, 17 * but WITHOUT ANY WARRANTY; without even the implied warranty of 18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 19 * GNU General Public License for more details. 20 * 21 * You should have received a copy of the GNU General Public License 22 * along with this program; if not, write to the Free Software 23 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 24 */ 25 26#include <linux/pci.h> 27#include <linux/kernel.h> 28#include <linux/types.h> 29 30#include <asm/addrspace.h> 31#include <asm/debug.h> 32 33#include <asm/emma2rh/emma2rh.h> 34 35#define RTABORT (0x1<<9) 36#define RMABORT (0x1<<10) 37#define EMMA2RH_PCI_SLOT_NUM 9 /* 0000:09.0 is final PCI device */ 38 39/* 40 * access config space 41 */ 42 43static int check_args(struct pci_bus *bus, u32 devfn, u32 * bus_num) 44{ 45 /* check if the bus is top-level */ 46 if (bus->parent != NULL) { 47 *bus_num = bus->number; 48 db_assert(bus_num != 0); 49 } else 50 *bus_num = 0; 51 52 if (*bus_num == 0) { 53 /* Type 0 */ 54 if (PCI_SLOT(devfn) >= 10) 55 return PCIBIOS_DEVICE_NOT_FOUND; 56 } else { 57 /* Type 1 */ 58 if ((*bus_num >= 64) || (PCI_SLOT(devfn) >= 16)) 59 return PCIBIOS_DEVICE_NOT_FOUND; 60 } 61 return 0; 62} 63 64static inline int set_pci_configuration_address(unsigned char bus_num, 65 unsigned int devfn, int where) 66{ 67 u32 config_win0; 68 69 emma2rh_out32(EMMA2RH_PCI_INT, ~RMABORT); 70 if (bus_num == 0) 71 /* 72 * Type 0 configuration 73 */ 74 config_win0 = (1 << (22 + PCI_SLOT(devfn))) | (5 << 9); 75 else 76 /* 77 * Type 1 configuration 78 */ 79 config_win0 = (bus_num << 26) | (PCI_SLOT(devfn) << 22) | 80 (1 << 15) | (5 << 9); 81 82 emma2rh_out32(EMMA2RH_PCI_IWIN0_CTR, config_win0); 83 84 return 0; 85} 86 87static int pci_config_read(struct pci_bus *bus, unsigned int devfn, int where, 88 int size, uint32_t * val) 89{ 90 u32 bus_num; 91 u32 base = KSEG1ADDR(EMMA2RH_PCI_CONFIG_BASE); 92 u32 backup_win0; 93 u32 data; 94 95 *val = 0xffffffffU; 96 97 if (check_args(bus, devfn, &bus_num) == PCIBIOS_DEVICE_NOT_FOUND) 98 return PCIBIOS_DEVICE_NOT_FOUND; 99 100 backup_win0 = emma2rh_in32(EMMA2RH_PCI_IWIN0_CTR); 101 102 if (set_pci_configuration_address(bus_num, devfn, where) < 0) 103 return PCIBIOS_DEVICE_NOT_FOUND; 104 105 data = 106 *(volatile u32 *)(base + (PCI_FUNC(devfn) << 8) + 107 (where & 0xfffffffc)); 108 109 switch (size) { 110 case 1: 111 *val = (data >> ((where & 3) << 3)) & 0xffU; 112 break; 113 case 2: 114 *val = (data >> ((where & 2) << 3)) & 0xffffU; 115 break; 116 case 4: 117 *val = data; 118 break; 119 default: 120 emma2rh_out32(EMMA2RH_PCI_IWIN0_CTR, backup_win0); 121 return PCIBIOS_FUNC_NOT_SUPPORTED; 122 } 123 124 emma2rh_out32(EMMA2RH_PCI_IWIN0_CTR, backup_win0); 125 126 if (emma2rh_in32(EMMA2RH_PCI_INT) & RMABORT) 127 return PCIBIOS_DEVICE_NOT_FOUND; 128 129 return PCIBIOS_SUCCESSFUL; 130} 131 132static int pci_config_write(struct pci_bus *bus, unsigned int devfn, int where, 133 int size, u32 val) 134{ 135 u32 bus_num; 136 u32 base = KSEG1ADDR(EMMA2RH_PCI_CONFIG_BASE); 137 u32 backup_win0; 138 u32 data; 139 int shift; 140 141 if (check_args(bus, devfn, &bus_num) == PCIBIOS_DEVICE_NOT_FOUND) 142 return PCIBIOS_DEVICE_NOT_FOUND; 143 144 backup_win0 = emma2rh_in32(EMMA2RH_PCI_IWIN0_CTR); 145 146 if (set_pci_configuration_address(bus_num, devfn, where) < 0) 147 return PCIBIOS_DEVICE_NOT_FOUND; 148 149 /* read modify write */ 150 data = 151 *(volatile u32 *)(base + (PCI_FUNC(devfn) << 8) + 152 (where & 0xfffffffc)); 153 154 switch (size) { 155 case 1: 156 shift = (where & 3) << 3; 157 data &= ~(0xffU << shift); 158 data |= ((val & 0xffU) << shift); 159 break; 160 case 2: 161 shift = (where & 2) << 3; 162 data &= ~(0xffffU << shift); 163 data |= ((val & 0xffffU) << shift); 164 break; 165 case 4: 166 data = val; 167 break; 168 default: 169 emma2rh_out32(EMMA2RH_PCI_IWIN0_CTR, backup_win0); 170 return PCIBIOS_FUNC_NOT_SUPPORTED; 171 } 172 *(volatile u32 *)(base + (PCI_FUNC(devfn) << 8) + 173 (where & 0xfffffffc)) = data; 174 175 emma2rh_out32(EMMA2RH_PCI_IWIN0_CTR, backup_win0); 176 if (emma2rh_in32(EMMA2RH_PCI_INT) & RMABORT) 177 return PCIBIOS_DEVICE_NOT_FOUND; 178 179 return PCIBIOS_SUCCESSFUL; 180} 181 182struct pci_ops emma2rh_pci_ops = { 183 .read = pci_config_read, 184 .write = pci_config_write, 185}; 186