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 #ifdef CONFIG_LEMOTE_FULOONG2E 33 #define CFG_SPACE_REG(offset) (void *)CKSEG1ADDR(BONITO_PCICFG_BASE | (offset)) 34 #define ID_SEL_BEGIN 11 35 #else 36 #define CFG_SPACE_REG(offset) (void *)CKSEG1ADDR(_pcictrl_bonito_pcicfg + (offset)) 37 #define ID_SEL_BEGIN 10 38 #endif 39 #define MAX_DEV_NUM (31 - ID_SEL_BEGIN) 40 41 42 static int bonito64_pcibios_config_access(unsigned char access_type, 43 struct pci_bus *bus, 44 unsigned int devfn, int where, 45 u32 * data) 46 { 47 u32 busnum = bus->number; 48 u32 addr, type; 49 u32 dummy; 50 void *addrp; 51 int device = PCI_SLOT(devfn); 52 int function = PCI_FUNC(devfn); 53 int reg = where & ~3; 54 55 if (busnum == 0) { 56 /* Type 0 configuration for onboard PCI bus */ 57 if (device > MAX_DEV_NUM) 58 return -1; 59 60 addr = (1 << (device + ID_SEL_BEGIN)) | (function << 8) | reg; 61 type = 0; 62 } else { 63 /* Type 1 configuration for offboard PCI bus */ 64 addr = (busnum << 16) | (device << 11) | (function << 8) | reg; 65 type = 0x10000; 66 } 67 68 /* Clear aborts */ 69 BONITO_PCICMD |= BONITO_PCICMD_MABORT_CLR | BONITO_PCICMD_MTABORT_CLR; 70 71 BONITO_PCIMAP_CFG = (addr >> 16) | type; 72 73 /* Flush Bonito register block */ 74 dummy = BONITO_PCIMAP_CFG; 75 mmiowb(); 76 77 addrp = CFG_SPACE_REG(addr & 0xffff); 78 if (access_type == PCI_ACCESS_WRITE) { 79 writel(cpu_to_le32(*data), addrp); 80 #ifndef CONFIG_LEMOTE_FULOONG2E 81 /* Wait till done */ 82 while (BONITO_PCIMSTAT & 0xF); 83 #endif 84 } else { 85 *data = le32_to_cpu(readl(addrp)); 86 } 87 88 /* Detect Master/Target abort */ 89 if (BONITO_PCICMD & (BONITO_PCICMD_MABORT_CLR | 90 BONITO_PCICMD_MTABORT_CLR)) { 91 /* Error occurred */ 92 93 /* Clear bits */ 94 BONITO_PCICMD |= (BONITO_PCICMD_MABORT_CLR | 95 BONITO_PCICMD_MTABORT_CLR); 96 97 return -1; 98 } 99 100 return 0; 101 102 } 103 104 105 /* 106 * We can't address 8 and 16 bit words directly. Instead we have to 107 * read/write a 32bit word and mask/modify the data we actually want. 108 */ 109 static int bonito64_pcibios_read(struct pci_bus *bus, unsigned int devfn, 110 int where, int size, u32 * val) 111 { 112 u32 data = 0; 113 114 if ((size == 2) && (where & 1)) 115 return PCIBIOS_BAD_REGISTER_NUMBER; 116 else if ((size == 4) && (where & 3)) 117 return PCIBIOS_BAD_REGISTER_NUMBER; 118 119 if (bonito64_pcibios_config_access(PCI_ACCESS_READ, bus, devfn, where, 120 &data)) 121 return -1; 122 123 if (size == 1) 124 *val = (data >> ((where & 3) << 3)) & 0xff; 125 else if (size == 2) 126 *val = (data >> ((where & 3) << 3)) & 0xffff; 127 else 128 *val = data; 129 130 return PCIBIOS_SUCCESSFUL; 131 } 132 133 static int bonito64_pcibios_write(struct pci_bus *bus, unsigned int devfn, 134 int where, int size, u32 val) 135 { 136 u32 data = 0; 137 138 if ((size == 2) && (where & 1)) 139 return PCIBIOS_BAD_REGISTER_NUMBER; 140 else if ((size == 4) && (where & 3)) 141 return PCIBIOS_BAD_REGISTER_NUMBER; 142 143 if (size == 4) 144 data = val; 145 else { 146 if (bonito64_pcibios_config_access(PCI_ACCESS_READ, bus, devfn, 147 where, &data)) 148 return -1; 149 150 if (size == 1) 151 data = (data & ~(0xff << ((where & 3) << 3))) | 152 (val << ((where & 3) << 3)); 153 else if (size == 2) 154 data = (data & ~(0xffff << ((where & 3) << 3))) | 155 (val << ((where & 3) << 3)); 156 } 157 158 if (bonito64_pcibios_config_access(PCI_ACCESS_WRITE, bus, devfn, where, 159 &data)) 160 return -1; 161 162 return PCIBIOS_SUCCESSFUL; 163 } 164 165 struct pci_ops bonito64_pci_ops = { 166 .read = bonito64_pcibios_read, 167 .write = bonito64_pcibios_write 168 }; 169