1/* 2 * Define the pci_ops for the Toshiba rbtx4938 3 * Copyright (C) 2000-2001 Toshiba Corporation 4 * 5 * 2003-2005 (c) MontaVista Software, Inc. This file is licensed under the 6 * terms of the GNU General Public License version 2. This program is 7 * licensed "as is" without any warranty of any kind, whether express 8 * or implied. 9 * 10 * Support for TX4938 in 2.6 - Manish Lachwani (mlachwani@mvista.com) 11 */ 12#include <linux/types.h> 13#include <linux/pci.h> 14#include <linux/kernel.h> 15#include <linux/init.h> 16 17#include <asm/addrspace.h> 18#include <asm/tx4938/rbtx4938.h> 19 20/* initialize in setup */ 21struct resource pci_io_resource = { 22 .name = "pci IO space", 23 .start = 0, 24 .end = 0, 25 .flags = IORESOURCE_IO 26}; 27 28/* initialize in setup */ 29struct resource pci_mem_resource = { 30 .name = "pci memory space", 31 .start = 0, 32 .end = 0, 33 .flags = IORESOURCE_MEM 34}; 35 36struct resource tx4938_pcic1_pci_io_resource = { 37 .name = "PCI1 IO", 38 .start = 0, 39 .end = 0, 40 .flags = IORESOURCE_IO 41}; 42struct resource tx4938_pcic1_pci_mem_resource = { 43 .name = "PCI1 mem", 44 .start = 0, 45 .end = 0, 46 .flags = IORESOURCE_MEM 47}; 48 49static int mkaddr(int bus, int dev_fn, int where, int *flagsp) 50{ 51 if (bus > 0) { 52 /* Type 1 configuration */ 53 tx4938_pcicptr->g2pcfgadrs = ((bus & 0xff) << 0x10) | 54 ((dev_fn & 0xff) << 0x08) | (where & 0xfc) | 1; 55 } else { 56 if (dev_fn >= PCI_DEVFN(TX4938_PCIC_MAX_DEVNU, 0)) 57 return -1; 58 59 /* Type 0 configuration */ 60 tx4938_pcicptr->g2pcfgadrs = ((bus & 0xff) << 0x10) | 61 ((dev_fn & 0xff) << 0x08) | (where & 0xfc); 62 } 63 /* clear M_ABORT and Disable M_ABORT Int. */ 64 tx4938_pcicptr->pcistatus = 65 (tx4938_pcicptr->pcistatus & 0x0000ffff) | 66 (PCI_STATUS_REC_MASTER_ABORT << 16); 67 tx4938_pcicptr->pcimask &= ~PCI_STATUS_REC_MASTER_ABORT; 68 69 return 0; 70} 71 72static int check_abort(int flags) 73{ 74 int code = PCIBIOS_SUCCESSFUL; 75 /* wait write cycle completion before checking error status */ 76 while (tx4938_pcicptr->pcicstatus & TX4938_PCIC_PCICSTATUS_IWB) 77 ; 78 if (tx4938_pcicptr->pcistatus & (PCI_STATUS_REC_MASTER_ABORT << 16)) { 79 tx4938_pcicptr->pcistatus = 80 (tx4938_pcicptr-> 81 pcistatus & 0x0000ffff) | (PCI_STATUS_REC_MASTER_ABORT 82 << 16); 83 tx4938_pcicptr->pcimask |= PCI_STATUS_REC_MASTER_ABORT; 84 code = PCIBIOS_DEVICE_NOT_FOUND; 85 } 86 return code; 87} 88 89static int tx4938_pcibios_read_config(struct pci_bus *bus, unsigned int devfn, 90 int where, int size, u32 * val) 91{ 92 int flags, retval, dev, busno, func; 93 94 dev = PCI_SLOT(devfn); 95 func = PCI_FUNC(devfn); 96 97 /* check if the bus is top-level */ 98 if (bus->parent != NULL) 99 busno = bus->number; 100 else { 101 busno = 0; 102 } 103 104 if (mkaddr(busno, devfn, where, &flags)) 105 return -1; 106 107 switch (size) { 108 case 1: 109 *val = *(volatile u8 *) ((unsigned long) & tx4938_pcicptr->g2pcfgdata | 110#ifdef __BIG_ENDIAN 111 ((where & 3) ^ 3)); 112#else 113 (where & 3)); 114#endif 115 break; 116 case 2: 117 *val = *(volatile u16 *) ((unsigned long) & tx4938_pcicptr->g2pcfgdata | 118#ifdef __BIG_ENDIAN 119 ((where & 3) ^ 2)); 120#else 121 (where & 3)); 122#endif 123 break; 124 case 4: 125 *val = tx4938_pcicptr->g2pcfgdata; 126 break; 127 } 128 129 retval = check_abort(flags); 130 if (retval == PCIBIOS_DEVICE_NOT_FOUND) 131 *val = 0xffffffff; 132 133 return retval; 134} 135 136static int tx4938_pcibios_write_config(struct pci_bus *bus, unsigned int devfn, int where, 137 int size, u32 val) 138{ 139 int flags, dev, busno, func; 140 141 busno = bus->number; 142 dev = PCI_SLOT(devfn); 143 func = PCI_FUNC(devfn); 144 145 /* check if the bus is top-level */ 146 if (bus->parent != NULL) { 147 busno = bus->number; 148 } else { 149 busno = 0; 150 } 151 152 if (mkaddr(busno, devfn, where, &flags)) 153 return -1; 154 155 switch (size) { 156 case 1: 157 *(volatile u8 *) ((unsigned long) & tx4938_pcicptr->g2pcfgdata | 158#ifdef __BIG_ENDIAN 159 ((where & 3) ^ 3)) = val; 160#else 161 (where & 3)) = val; 162#endif 163 break; 164 case 2: 165 *(volatile u16 *) ((unsigned long) & tx4938_pcicptr->g2pcfgdata | 166#ifdef __BIG_ENDIAN 167 ((where & 0x3) ^ 0x2)) = val; 168#else 169 (where & 3)) = val; 170#endif 171 break; 172 case 4: 173 tx4938_pcicptr->g2pcfgdata = val; 174 break; 175 } 176 177 return check_abort(flags); 178} 179 180struct pci_ops tx4938_pci_ops = { 181 tx4938_pcibios_read_config, 182 tx4938_pcibios_write_config 183}; 184 185struct pci_controller tx4938_pci_controller[] = { 186 /* h/w only supports devices 0x00 to 0x14 */ 187 { 188 .pci_ops = &tx4938_pci_ops, 189 .io_resource = &pci_io_resource, 190 .mem_resource = &pci_mem_resource, 191 }, 192 /* h/w only supports devices 0x00 to 0x14 */ 193 { 194 .pci_ops = &tx4938_pci_ops, 195 .io_resource = &tx4938_pcic1_pci_io_resource, 196 .mem_resource = &tx4938_pcic1_pci_mem_resource, 197 } 198}; 199