1 /* 2 * Common pmac/prep/chrp pci routines. -- Cort 3 */ 4 5 #include <linux/kernel.h> 6 #include <linux/pci.h> 7 #include <linux/delay.h> 8 #include <linux/string.h> 9 #include <linux/init.h> 10 #include <linux/capability.h> 11 #include <linux/sched.h> 12 #include <linux/errno.h> 13 #include <linux/bootmem.h> 14 #include <linux/irq.h> 15 #include <linux/list.h> 16 #include <linux/of.h> 17 #include <linux/slab.h> 18 19 #include <asm/processor.h> 20 #include <asm/io.h> 21 #include <asm/prom.h> 22 #include <asm/sections.h> 23 #include <asm/pci-bridge.h> 24 #include <asm/ppc-pci.h> 25 #include <asm/byteorder.h> 26 #include <asm/uaccess.h> 27 #include <asm/machdep.h> 28 29 #undef DEBUG 30 31 unsigned long isa_io_base = 0; 32 unsigned long pci_dram_offset = 0; 33 int pcibios_assign_bus_offset = 1; 34 35 void pcibios_make_OF_bus_map(void); 36 37 static void fixup_cpc710_pci64(struct pci_dev* dev); 38 static u8* pci_to_OF_bus_map; 39 40 /* By default, we don't re-assign bus numbers. We do this only on 41 * some pmacs 42 */ 43 static int pci_assign_all_buses; 44 45 static int pci_bus_count; 46 47 /* This will remain NULL for now, until isa-bridge.c is made common 48 * to both 32-bit and 64-bit. 49 */ 50 struct pci_dev *isa_bridge_pcidev; 51 EXPORT_SYMBOL_GPL(isa_bridge_pcidev); 52 53 static void 54 fixup_cpc710_pci64(struct pci_dev* dev) 55 { 56 /* Hide the PCI64 BARs from the kernel as their content doesn't 57 * fit well in the resource management 58 */ 59 dev->resource[0].start = dev->resource[0].end = 0; 60 dev->resource[0].flags = 0; 61 dev->resource[1].start = dev->resource[1].end = 0; 62 dev->resource[1].flags = 0; 63 } 64 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_IBM, PCI_DEVICE_ID_IBM_CPC710_PCI64, fixup_cpc710_pci64); 65 66 /* 67 * Functions below are used on OpenFirmware machines. 68 */ 69 static void 70 make_one_node_map(struct device_node* node, u8 pci_bus) 71 { 72 const int *bus_range; 73 int len; 74 75 if (pci_bus >= pci_bus_count) 76 return; 77 bus_range = of_get_property(node, "bus-range", &len); 78 if (bus_range == NULL || len < 2 * sizeof(int)) { 79 printk(KERN_WARNING "Can't get bus-range for %s, " 80 "assuming it starts at 0\n", node->full_name); 81 pci_to_OF_bus_map[pci_bus] = 0; 82 } else 83 pci_to_OF_bus_map[pci_bus] = bus_range[0]; 84 85 for_each_child_of_node(node, node) { 86 struct pci_dev* dev; 87 const unsigned int *class_code, *reg; 88 89 class_code = of_get_property(node, "class-code", NULL); 90 if (!class_code || ((*class_code >> 8) != PCI_CLASS_BRIDGE_PCI && 91 (*class_code >> 8) != PCI_CLASS_BRIDGE_CARDBUS)) 92 continue; 93 reg = of_get_property(node, "reg", NULL); 94 if (!reg) 95 continue; 96 dev = pci_get_bus_and_slot(pci_bus, ((reg[0] >> 8) & 0xff)); 97 if (!dev || !dev->subordinate) { 98 pci_dev_put(dev); 99 continue; 100 } 101 make_one_node_map(node, dev->subordinate->number); 102 pci_dev_put(dev); 103 } 104 } 105 106 void 107 pcibios_make_OF_bus_map(void) 108 { 109 int i; 110 struct pci_controller *hose, *tmp; 111 struct property *map_prop; 112 struct device_node *dn; 113 114 pci_to_OF_bus_map = kmalloc(pci_bus_count, GFP_KERNEL); 115 if (!pci_to_OF_bus_map) { 116 printk(KERN_ERR "Can't allocate OF bus map !\n"); 117 return; 118 } 119 120 /* We fill the bus map with invalid values, that helps 121 * debugging. 122 */ 123 for (i=0; i<pci_bus_count; i++) 124 pci_to_OF_bus_map[i] = 0xff; 125 126 /* For each hose, we begin searching bridges */ 127 list_for_each_entry_safe(hose, tmp, &hose_list, list_node) { 128 struct device_node* node = hose->dn; 129 130 if (!node) 131 continue; 132 make_one_node_map(node, hose->first_busno); 133 } 134 dn = of_find_node_by_path("/"); 135 map_prop = of_find_property(dn, "pci-OF-bus-map", NULL); 136 if (map_prop) { 137 BUG_ON(pci_bus_count > map_prop->length); 138 memcpy(map_prop->value, pci_to_OF_bus_map, pci_bus_count); 139 } 140 of_node_put(dn); 141 #ifdef DEBUG 142 printk("PCI->OF bus map:\n"); 143 for (i=0; i<pci_bus_count; i++) { 144 if (pci_to_OF_bus_map[i] == 0xff) 145 continue; 146 printk("%d -> %d\n", i, pci_to_OF_bus_map[i]); 147 } 148 #endif 149 } 150 151 152 /* 153 * Returns the PCI device matching a given OF node 154 */ 155 int pci_device_from_OF_node(struct device_node *node, u8 *bus, u8 *devfn) 156 { 157 struct pci_dev *dev = NULL; 158 const __be32 *reg; 159 int size; 160 161 /* Check if it might have a chance to be a PCI device */ 162 if (!pci_find_hose_for_OF_device(node)) 163 return -ENODEV; 164 165 reg = of_get_property(node, "reg", &size); 166 if (!reg || size < 5 * sizeof(u32)) 167 return -ENODEV; 168 169 *bus = (be32_to_cpup(®[0]) >> 16) & 0xff; 170 *devfn = (be32_to_cpup(®[0]) >> 8) & 0xff; 171 172 /* Ok, here we need some tweak. If we have already renumbered 173 * all busses, we can't rely on the OF bus number any more. 174 * the pci_to_OF_bus_map is not enough as several PCI busses 175 * may match the same OF bus number. 176 */ 177 if (!pci_to_OF_bus_map) 178 return 0; 179 180 for_each_pci_dev(dev) 181 if (pci_to_OF_bus_map[dev->bus->number] == *bus && 182 dev->devfn == *devfn) { 183 *bus = dev->bus->number; 184 pci_dev_put(dev); 185 return 0; 186 } 187 188 return -ENODEV; 189 } 190 EXPORT_SYMBOL(pci_device_from_OF_node); 191 192 /* We create the "pci-OF-bus-map" property now so it appears in the 193 * /proc device tree 194 */ 195 void __init 196 pci_create_OF_bus_map(void) 197 { 198 struct property* of_prop; 199 struct device_node *dn; 200 201 of_prop = (struct property*) alloc_bootmem(sizeof(struct property) + 256); 202 if (!of_prop) 203 return; 204 dn = of_find_node_by_path("/"); 205 if (dn) { 206 memset(of_prop, -1, sizeof(struct property) + 256); 207 of_prop->name = "pci-OF-bus-map"; 208 of_prop->length = 256; 209 of_prop->value = &of_prop[1]; 210 prom_add_property(dn, of_prop); 211 of_node_put(dn); 212 } 213 } 214 215 void __devinit pcibios_setup_phb_io_space(struct pci_controller *hose) 216 { 217 unsigned long io_offset; 218 struct resource *res = &hose->io_resource; 219 220 /* Fixup IO space offset */ 221 io_offset = (unsigned long)hose->io_base_virt - isa_io_base; 222 res->start = (res->start + io_offset) & 0xffffffffu; 223 res->end = (res->end + io_offset) & 0xffffffffu; 224 } 225 226 static int __init pcibios_init(void) 227 { 228 struct pci_controller *hose, *tmp; 229 int next_busno = 0; 230 231 printk(KERN_INFO "PCI: Probing PCI hardware\n"); 232 233 if (pci_has_flag(PCI_REASSIGN_ALL_BUS)) 234 pci_assign_all_buses = 1; 235 236 /* Scan all of the recorded PCI controllers. */ 237 list_for_each_entry_safe(hose, tmp, &hose_list, list_node) { 238 if (pci_assign_all_buses) 239 hose->first_busno = next_busno; 240 hose->last_busno = 0xff; 241 pcibios_scan_phb(hose); 242 pci_bus_add_devices(hose->bus); 243 if (pci_assign_all_buses || next_busno <= hose->last_busno) 244 next_busno = hose->last_busno + pcibios_assign_bus_offset; 245 } 246 pci_bus_count = next_busno; 247 248 /* OpenFirmware based machines need a map of OF bus 249 * numbers vs. kernel bus numbers since we may have to 250 * remap them. 251 */ 252 if (pci_assign_all_buses) 253 pcibios_make_OF_bus_map(); 254 255 /* Call common code to handle resource allocation */ 256 pcibios_resource_survey(); 257 258 /* Call machine dependent post-init code */ 259 if (ppc_md.pcibios_after_init) 260 ppc_md.pcibios_after_init(); 261 262 return 0; 263 } 264 265 subsys_initcall(pcibios_init); 266 267 static struct pci_controller* 268 pci_bus_to_hose(int bus) 269 { 270 struct pci_controller *hose, *tmp; 271 272 list_for_each_entry_safe(hose, tmp, &hose_list, list_node) 273 if (bus >= hose->first_busno && bus <= hose->last_busno) 274 return hose; 275 return NULL; 276 } 277 278 /* Provide information on locations of various I/O regions in physical 279 * memory. Do this on a per-card basis so that we choose the right 280 * root bridge. 281 * Note that the returned IO or memory base is a physical address 282 */ 283 284 long sys_pciconfig_iobase(long which, unsigned long bus, unsigned long devfn) 285 { 286 struct pci_controller* hose; 287 long result = -EOPNOTSUPP; 288 289 hose = pci_bus_to_hose(bus); 290 if (!hose) 291 return -ENODEV; 292 293 switch (which) { 294 case IOBASE_BRIDGE_NUMBER: 295 return (long)hose->first_busno; 296 case IOBASE_MEMORY: 297 return (long)hose->pci_mem_offset; 298 case IOBASE_IO: 299 return (long)hose->io_base_phys; 300 case IOBASE_ISA_IO: 301 return (long)isa_io_base; 302 case IOBASE_ISA_MEM: 303 return (long)isa_mem_base; 304 } 305 306 return result; 307 } 308 309 310