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/memblock.h> 14 #include <linux/syscalls.h> 15 #include <linux/irq.h> 16 #include <linux/list.h> 17 #include <linux/of.h> 18 #include <linux/slab.h> 19 #include <linux/export.h> 20 21 #include <asm/processor.h> 22 #include <asm/io.h> 23 #include <asm/prom.h> 24 #include <asm/sections.h> 25 #include <asm/pci-bridge.h> 26 #include <asm/ppc-pci.h> 27 #include <asm/byteorder.h> 28 #include <linux/uaccess.h> 29 #include <asm/machdep.h> 30 31 #undef DEBUG 32 33 unsigned long isa_io_base = 0; 34 unsigned long pci_dram_offset = 0; 35 int pcibios_assign_bus_offset = 1; 36 EXPORT_SYMBOL(isa_io_base); 37 EXPORT_SYMBOL(pci_dram_offset); 38 39 void pcibios_make_OF_bus_map(void); 40 41 static void fixup_cpc710_pci64(struct pci_dev* dev); 42 static u8* pci_to_OF_bus_map; 43 44 /* By default, we don't re-assign bus numbers. We do this only on 45 * some pmacs 46 */ 47 static int pci_assign_all_buses; 48 49 static int pci_bus_count; 50 51 /* This will remain NULL for now, until isa-bridge.c is made common 52 * to both 32-bit and 64-bit. 53 */ 54 struct pci_dev *isa_bridge_pcidev; 55 EXPORT_SYMBOL_GPL(isa_bridge_pcidev); 56 57 static void 58 fixup_cpc710_pci64(struct pci_dev* dev) 59 { 60 /* Hide the PCI64 BARs from the kernel as their content doesn't 61 * fit well in the resource management 62 */ 63 dev->resource[0].start = dev->resource[0].end = 0; 64 dev->resource[0].flags = 0; 65 dev->resource[1].start = dev->resource[1].end = 0; 66 dev->resource[1].flags = 0; 67 } 68 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_IBM, PCI_DEVICE_ID_IBM_CPC710_PCI64, fixup_cpc710_pci64); 69 70 /* 71 * Functions below are used on OpenFirmware machines. 72 */ 73 static void 74 make_one_node_map(struct device_node* node, u8 pci_bus) 75 { 76 const int *bus_range; 77 int len; 78 79 if (pci_bus >= pci_bus_count) 80 return; 81 bus_range = of_get_property(node, "bus-range", &len); 82 if (bus_range == NULL || len < 2 * sizeof(int)) { 83 printk(KERN_WARNING "Can't get bus-range for %pOF, " 84 "assuming it starts at 0\n", node); 85 pci_to_OF_bus_map[pci_bus] = 0; 86 } else 87 pci_to_OF_bus_map[pci_bus] = bus_range[0]; 88 89 for_each_child_of_node(node, node) { 90 struct pci_dev* dev; 91 const unsigned int *class_code, *reg; 92 93 class_code = of_get_property(node, "class-code", NULL); 94 if (!class_code || ((*class_code >> 8) != PCI_CLASS_BRIDGE_PCI && 95 (*class_code >> 8) != PCI_CLASS_BRIDGE_CARDBUS)) 96 continue; 97 reg = of_get_property(node, "reg", NULL); 98 if (!reg) 99 continue; 100 dev = pci_get_domain_bus_and_slot(0, pci_bus, 101 ((reg[0] >> 8) & 0xff)); 102 if (!dev || !dev->subordinate) { 103 pci_dev_put(dev); 104 continue; 105 } 106 make_one_node_map(node, dev->subordinate->number); 107 pci_dev_put(dev); 108 } 109 } 110 111 void 112 pcibios_make_OF_bus_map(void) 113 { 114 int i; 115 struct pci_controller *hose, *tmp; 116 struct property *map_prop; 117 struct device_node *dn; 118 119 pci_to_OF_bus_map = kmalloc(pci_bus_count, GFP_KERNEL); 120 if (!pci_to_OF_bus_map) { 121 printk(KERN_ERR "Can't allocate OF bus map !\n"); 122 return; 123 } 124 125 /* We fill the bus map with invalid values, that helps 126 * debugging. 127 */ 128 for (i=0; i<pci_bus_count; i++) 129 pci_to_OF_bus_map[i] = 0xff; 130 131 /* For each hose, we begin searching bridges */ 132 list_for_each_entry_safe(hose, tmp, &hose_list, list_node) { 133 struct device_node* node = hose->dn; 134 135 if (!node) 136 continue; 137 make_one_node_map(node, hose->first_busno); 138 } 139 dn = of_find_node_by_path("/"); 140 map_prop = of_find_property(dn, "pci-OF-bus-map", NULL); 141 if (map_prop) { 142 BUG_ON(pci_bus_count > map_prop->length); 143 memcpy(map_prop->value, pci_to_OF_bus_map, pci_bus_count); 144 } 145 of_node_put(dn); 146 #ifdef DEBUG 147 printk("PCI->OF bus map:\n"); 148 for (i=0; i<pci_bus_count; i++) { 149 if (pci_to_OF_bus_map[i] == 0xff) 150 continue; 151 printk("%d -> %d\n", i, pci_to_OF_bus_map[i]); 152 } 153 #endif 154 } 155 156 157 /* 158 * Returns the PCI device matching a given OF node 159 */ 160 int pci_device_from_OF_node(struct device_node *node, u8 *bus, u8 *devfn) 161 { 162 struct pci_dev *dev = NULL; 163 const __be32 *reg; 164 int size; 165 166 /* Check if it might have a chance to be a PCI device */ 167 if (!pci_find_hose_for_OF_device(node)) 168 return -ENODEV; 169 170 reg = of_get_property(node, "reg", &size); 171 if (!reg || size < 5 * sizeof(u32)) 172 return -ENODEV; 173 174 *bus = (be32_to_cpup(®[0]) >> 16) & 0xff; 175 *devfn = (be32_to_cpup(®[0]) >> 8) & 0xff; 176 177 /* Ok, here we need some tweak. If we have already renumbered 178 * all busses, we can't rely on the OF bus number any more. 179 * the pci_to_OF_bus_map is not enough as several PCI busses 180 * may match the same OF bus number. 181 */ 182 if (!pci_to_OF_bus_map) 183 return 0; 184 185 for_each_pci_dev(dev) 186 if (pci_to_OF_bus_map[dev->bus->number] == *bus && 187 dev->devfn == *devfn) { 188 *bus = dev->bus->number; 189 pci_dev_put(dev); 190 return 0; 191 } 192 193 return -ENODEV; 194 } 195 EXPORT_SYMBOL(pci_device_from_OF_node); 196 197 /* We create the "pci-OF-bus-map" property now so it appears in the 198 * /proc device tree 199 */ 200 void __init 201 pci_create_OF_bus_map(void) 202 { 203 struct property* of_prop; 204 struct device_node *dn; 205 206 of_prop = memblock_alloc(sizeof(struct property) + 256, 207 SMP_CACHE_BYTES); 208 dn = of_find_node_by_path("/"); 209 if (dn) { 210 memset(of_prop, -1, sizeof(struct property) + 256); 211 of_prop->name = "pci-OF-bus-map"; 212 of_prop->length = 256; 213 of_prop->value = &of_prop[1]; 214 of_add_property(dn, of_prop); 215 of_node_put(dn); 216 } 217 } 218 219 void pcibios_setup_phb_io_space(struct pci_controller *hose) 220 { 221 unsigned long io_offset; 222 struct resource *res = &hose->io_resource; 223 224 /* Fixup IO space offset */ 225 io_offset = pcibios_io_space_offset(hose); 226 res->start += io_offset; 227 res->end += io_offset; 228 } 229 230 static int __init pcibios_init(void) 231 { 232 struct pci_controller *hose, *tmp; 233 int next_busno = 0; 234 235 printk(KERN_INFO "PCI: Probing PCI hardware\n"); 236 237 if (pci_has_flag(PCI_REASSIGN_ALL_BUS)) 238 pci_assign_all_buses = 1; 239 240 /* Scan all of the recorded PCI controllers. */ 241 list_for_each_entry_safe(hose, tmp, &hose_list, list_node) { 242 if (pci_assign_all_buses) 243 hose->first_busno = next_busno; 244 hose->last_busno = 0xff; 245 pcibios_scan_phb(hose); 246 pci_bus_add_devices(hose->bus); 247 if (pci_assign_all_buses || next_busno <= hose->last_busno) 248 next_busno = hose->last_busno + pcibios_assign_bus_offset; 249 } 250 pci_bus_count = next_busno; 251 252 /* OpenFirmware based machines need a map of OF bus 253 * numbers vs. kernel bus numbers since we may have to 254 * remap them. 255 */ 256 if (pci_assign_all_buses) 257 pcibios_make_OF_bus_map(); 258 259 /* Call common code to handle resource allocation */ 260 pcibios_resource_survey(); 261 262 /* Call machine dependent post-init code */ 263 if (ppc_md.pcibios_after_init) 264 ppc_md.pcibios_after_init(); 265 266 return 0; 267 } 268 269 subsys_initcall(pcibios_init); 270 271 static struct pci_controller* 272 pci_bus_to_hose(int bus) 273 { 274 struct pci_controller *hose, *tmp; 275 276 list_for_each_entry_safe(hose, tmp, &hose_list, list_node) 277 if (bus >= hose->first_busno && bus <= hose->last_busno) 278 return hose; 279 return NULL; 280 } 281 282 /* Provide information on locations of various I/O regions in physical 283 * memory. Do this on a per-card basis so that we choose the right 284 * root bridge. 285 * Note that the returned IO or memory base is a physical address 286 */ 287 288 SYSCALL_DEFINE3(pciconfig_iobase, long, which, 289 unsigned long, bus, unsigned long, devfn) 290 { 291 struct pci_controller* hose; 292 long result = -EOPNOTSUPP; 293 294 hose = pci_bus_to_hose(bus); 295 if (!hose) 296 return -ENODEV; 297 298 switch (which) { 299 case IOBASE_BRIDGE_NUMBER: 300 return (long)hose->first_busno; 301 case IOBASE_MEMORY: 302 return (long)hose->mem_offset[0]; 303 case IOBASE_IO: 304 return (long)hose->io_base_phys; 305 case IOBASE_ISA_IO: 306 return (long)isa_io_base; 307 case IOBASE_ISA_MEM: 308 return (long)isa_mem_base; 309 } 310 311 return result; 312 } 313