1 /* 2 * Copyright (C) 1999, 2000, 2004 MIPS Technologies, Inc. 3 * All rights reserved. 4 * Authors: Carsten Langgaard <carstenl@mips.com> 5 * Maciej W. Rozycki <macro@mips.com> 6 * 7 * This program is free software; you can distribute it and/or modify it 8 * under the terms of the GNU General Public License (Version 2) as 9 * published by the Free Software Foundation. 10 * 11 * This program is distributed in the hope it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * for more details. 15 * 16 * You should have received a copy of the GNU General Public License along 17 * with this program; if not, write to the Free Software Foundation, Inc., 18 * 59 Temple Place - Suite 330, Boston MA 02111-1307, USA. 19 * 20 * MIPS boards specific PCI support. 21 */ 22 #include <linux/types.h> 23 #include <linux/pci.h> 24 #include <linux/kernel.h> 25 #include <linux/init.h> 26 27 #include <asm/mips-boards/bonito64.h> 28 29 #define PCI_ACCESS_READ 0 30 #define PCI_ACCESS_WRITE 1 31 32 #define CFG_SPACE_REG(offset) (void *)CKSEG1ADDR(_pcictrl_bonito_pcicfg + (offset)) 33 #define ID_SEL_BEGIN 10 34 #define MAX_DEV_NUM (31 - ID_SEL_BEGIN) 35 36 37 static int bonito64_pcibios_config_access(unsigned char access_type, 38 struct pci_bus *bus, 39 unsigned int devfn, int where, 40 u32 * data) 41 { 42 u32 busnum = bus->number; 43 u32 addr, type; 44 u32 dummy; 45 void *addrp; 46 int device = PCI_SLOT(devfn); 47 int function = PCI_FUNC(devfn); 48 int reg = where & ~3; 49 50 if (busnum == 0) { 51 /* Type 0 configuration for onboard PCI bus */ 52 if (device > MAX_DEV_NUM) 53 return -1; 54 55 addr = (1 << (device + ID_SEL_BEGIN)) | (function << 8) | reg; 56 type = 0; 57 } else { 58 /* Type 1 configuration for offboard PCI bus */ 59 addr = (busnum << 16) | (device << 11) | (function << 8) | reg; 60 type = 0x10000; 61 } 62 63 /* Clear aborts */ 64 BONITO_PCICMD |= BONITO_PCICMD_MABORT_CLR | BONITO_PCICMD_MTABORT_CLR; 65 66 BONITO_PCIMAP_CFG = (addr >> 16) | type; 67 68 /* Flush Bonito register block */ 69 dummy = BONITO_PCIMAP_CFG; 70 mmiowb(); 71 72 addrp = CFG_SPACE_REG(addr & 0xffff); 73 if (access_type == PCI_ACCESS_WRITE) { 74 writel(cpu_to_le32(*data), addrp); 75 /* Wait till done */ 76 while (BONITO_PCIMSTAT & 0xF); 77 } else { 78 *data = le32_to_cpu(readl(addrp)); 79 } 80 81 /* Detect Master/Target abort */ 82 if (BONITO_PCICMD & (BONITO_PCICMD_MABORT_CLR | 83 BONITO_PCICMD_MTABORT_CLR)) { 84 /* Error occurred */ 85 86 /* Clear bits */ 87 BONITO_PCICMD |= (BONITO_PCICMD_MABORT_CLR | 88 BONITO_PCICMD_MTABORT_CLR); 89 90 return -1; 91 } 92 93 return 0; 94 95 } 96 97 98 /* 99 * We can't address 8 and 16 bit words directly. Instead we have to 100 * read/write a 32bit word and mask/modify the data we actually want. 101 */ 102 static int bonito64_pcibios_read(struct pci_bus *bus, unsigned int devfn, 103 int where, int size, u32 * val) 104 { 105 u32 data = 0; 106 107 if ((size == 2) && (where & 1)) 108 return PCIBIOS_BAD_REGISTER_NUMBER; 109 else if ((size == 4) && (where & 3)) 110 return PCIBIOS_BAD_REGISTER_NUMBER; 111 112 if (bonito64_pcibios_config_access(PCI_ACCESS_READ, bus, devfn, where, 113 &data)) 114 return -1; 115 116 if (size == 1) 117 *val = (data >> ((where & 3) << 3)) & 0xff; 118 else if (size == 2) 119 *val = (data >> ((where & 3) << 3)) & 0xffff; 120 else 121 *val = data; 122 123 return PCIBIOS_SUCCESSFUL; 124 } 125 126 static int bonito64_pcibios_write(struct pci_bus *bus, unsigned int devfn, 127 int where, int size, u32 val) 128 { 129 u32 data = 0; 130 131 if ((size == 2) && (where & 1)) 132 return PCIBIOS_BAD_REGISTER_NUMBER; 133 else if ((size == 4) && (where & 3)) 134 return PCIBIOS_BAD_REGISTER_NUMBER; 135 136 if (size == 4) 137 data = val; 138 else { 139 if (bonito64_pcibios_config_access(PCI_ACCESS_READ, bus, devfn, 140 where, &data)) 141 return -1; 142 143 if (size == 1) 144 data = (data & ~(0xff << ((where & 3) << 3))) | 145 (val << ((where & 3) << 3)); 146 else if (size == 2) 147 data = (data & ~(0xffff << ((where & 3) << 3))) | 148 (val << ((where & 3) << 3)); 149 } 150 151 if (bonito64_pcibios_config_access(PCI_ACCESS_WRITE, bus, devfn, where, 152 &data)) 153 return -1; 154 155 return PCIBIOS_SUCCESSFUL; 156 } 157 158 struct pci_ops bonito64_pci_ops = { 159 .read = bonito64_pcibios_read, 160 .write = bonito64_pcibios_write 161 }; 162