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 26 #include <asm/mips-boards/bonito64.h> 27 28 #define PCI_ACCESS_READ 0 29 #define PCI_ACCESS_WRITE 1 30 31 #define CFG_SPACE_REG(offset) (void *)CKSEG1ADDR(_pcictrl_bonito_pcicfg + (offset)) 32 #define ID_SEL_BEGIN 10 33 #define MAX_DEV_NUM (31 - ID_SEL_BEGIN) 34 35 36 static int bonito64_pcibios_config_access(unsigned char access_type, 37 struct pci_bus *bus, 38 unsigned int devfn, int where, 39 u32 * data) 40 { 41 u32 busnum = bus->number; 42 u32 addr, type; 43 u32 dummy; 44 void *addrp; 45 int device = PCI_SLOT(devfn); 46 int function = PCI_FUNC(devfn); 47 int reg = where & ~3; 48 49 if (busnum == 0) { 50 /* Type 0 configuration for onboard PCI bus */ 51 if (device > MAX_DEV_NUM) 52 return -1; 53 54 addr = (1 << (device + ID_SEL_BEGIN)) | (function << 8) | reg; 55 type = 0; 56 } else { 57 /* Type 1 configuration for offboard PCI bus */ 58 addr = (busnum << 16) | (device << 11) | (function << 8) | reg; 59 type = 0x10000; 60 } 61 62 /* Clear aborts */ 63 BONITO_PCICMD |= BONITO_PCICMD_MABORT_CLR | BONITO_PCICMD_MTABORT_CLR; 64 65 BONITO_PCIMAP_CFG = (addr >> 16) | type; 66 67 /* Flush Bonito register block */ 68 dummy = BONITO_PCIMAP_CFG; 69 mmiowb(); 70 71 addrp = CFG_SPACE_REG(addr & 0xffff); 72 if (access_type == PCI_ACCESS_WRITE) { 73 writel(cpu_to_le32(*data), addrp); 74 /* Wait till done */ 75 while (BONITO_PCIMSTAT & 0xF); 76 } else { 77 *data = le32_to_cpu(readl(addrp)); 78 } 79 80 /* Detect Master/Target abort */ 81 if (BONITO_PCICMD & (BONITO_PCICMD_MABORT_CLR | 82 BONITO_PCICMD_MTABORT_CLR)) { 83 /* Error occurred */ 84 85 /* Clear bits */ 86 BONITO_PCICMD |= (BONITO_PCICMD_MABORT_CLR | 87 BONITO_PCICMD_MTABORT_CLR); 88 89 return -1; 90 } 91 92 return 0; 93 94 } 95 96 97 /* 98 * We can't address 8 and 16 bit words directly. Instead we have to 99 * read/write a 32bit word and mask/modify the data we actually want. 100 */ 101 static int bonito64_pcibios_read(struct pci_bus *bus, unsigned int devfn, 102 int where, int size, u32 * val) 103 { 104 u32 data = 0; 105 106 if ((size == 2) && (where & 1)) 107 return PCIBIOS_BAD_REGISTER_NUMBER; 108 else if ((size == 4) && (where & 3)) 109 return PCIBIOS_BAD_REGISTER_NUMBER; 110 111 if (bonito64_pcibios_config_access(PCI_ACCESS_READ, bus, devfn, where, 112 &data)) 113 return -1; 114 115 if (size == 1) 116 *val = (data >> ((where & 3) << 3)) & 0xff; 117 else if (size == 2) 118 *val = (data >> ((where & 3) << 3)) & 0xffff; 119 else 120 *val = data; 121 122 return PCIBIOS_SUCCESSFUL; 123 } 124 125 static int bonito64_pcibios_write(struct pci_bus *bus, unsigned int devfn, 126 int where, int size, u32 val) 127 { 128 u32 data = 0; 129 130 if ((size == 2) && (where & 1)) 131 return PCIBIOS_BAD_REGISTER_NUMBER; 132 else if ((size == 4) && (where & 3)) 133 return PCIBIOS_BAD_REGISTER_NUMBER; 134 135 if (size == 4) 136 data = val; 137 else { 138 if (bonito64_pcibios_config_access(PCI_ACCESS_READ, bus, devfn, 139 where, &data)) 140 return -1; 141 142 if (size == 1) 143 data = (data & ~(0xff << ((where & 3) << 3))) | 144 (val << ((where & 3) << 3)); 145 else if (size == 2) 146 data = (data & ~(0xffff << ((where & 3) << 3))) | 147 (val << ((where & 3) << 3)); 148 } 149 150 if (bonito64_pcibios_config_access(PCI_ACCESS_WRITE, bus, devfn, where, 151 &data)) 152 return -1; 153 154 return PCIBIOS_SUCCESSFUL; 155 } 156 157 struct pci_ops bonito64_pci_ops = { 158 .read = bonito64_pcibios_read, 159 .write = bonito64_pcibios_write 160 }; 161