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_hide_host_resource_fsl(struct pci_dev *dev) 55 { 56 int i, class = dev->class >> 8; 57 58 if ((class == PCI_CLASS_PROCESSOR_POWERPC || 59 class == PCI_CLASS_BRIDGE_OTHER) && 60 (dev->hdr_type == PCI_HEADER_TYPE_NORMAL) && 61 (dev->bus->parent == NULL)) { 62 for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) { 63 dev->resource[i].start = 0; 64 dev->resource[i].end = 0; 65 dev->resource[i].flags = 0; 66 } 67 } 68 } 69 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_MOTOROLA, PCI_ANY_ID, fixup_hide_host_resource_fsl); 70 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_FREESCALE, PCI_ANY_ID, fixup_hide_host_resource_fsl); 71 72 static void 73 fixup_cpc710_pci64(struct pci_dev* dev) 74 { 75 /* Hide the PCI64 BARs from the kernel as their content doesn't 76 * fit well in the resource management 77 */ 78 dev->resource[0].start = dev->resource[0].end = 0; 79 dev->resource[0].flags = 0; 80 dev->resource[1].start = dev->resource[1].end = 0; 81 dev->resource[1].flags = 0; 82 } 83 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_IBM, PCI_DEVICE_ID_IBM_CPC710_PCI64, fixup_cpc710_pci64); 84 85 /* 86 * Functions below are used on OpenFirmware machines. 87 */ 88 static void 89 make_one_node_map(struct device_node* node, u8 pci_bus) 90 { 91 const int *bus_range; 92 int len; 93 94 if (pci_bus >= pci_bus_count) 95 return; 96 bus_range = of_get_property(node, "bus-range", &len); 97 if (bus_range == NULL || len < 2 * sizeof(int)) { 98 printk(KERN_WARNING "Can't get bus-range for %s, " 99 "assuming it starts at 0\n", node->full_name); 100 pci_to_OF_bus_map[pci_bus] = 0; 101 } else 102 pci_to_OF_bus_map[pci_bus] = bus_range[0]; 103 104 for_each_child_of_node(node, node) { 105 struct pci_dev* dev; 106 const unsigned int *class_code, *reg; 107 108 class_code = of_get_property(node, "class-code", NULL); 109 if (!class_code || ((*class_code >> 8) != PCI_CLASS_BRIDGE_PCI && 110 (*class_code >> 8) != PCI_CLASS_BRIDGE_CARDBUS)) 111 continue; 112 reg = of_get_property(node, "reg", NULL); 113 if (!reg) 114 continue; 115 dev = pci_get_bus_and_slot(pci_bus, ((reg[0] >> 8) & 0xff)); 116 if (!dev || !dev->subordinate) { 117 pci_dev_put(dev); 118 continue; 119 } 120 make_one_node_map(node, dev->subordinate->number); 121 pci_dev_put(dev); 122 } 123 } 124 125 void 126 pcibios_make_OF_bus_map(void) 127 { 128 int i; 129 struct pci_controller *hose, *tmp; 130 struct property *map_prop; 131 struct device_node *dn; 132 133 pci_to_OF_bus_map = kmalloc(pci_bus_count, GFP_KERNEL); 134 if (!pci_to_OF_bus_map) { 135 printk(KERN_ERR "Can't allocate OF bus map !\n"); 136 return; 137 } 138 139 /* We fill the bus map with invalid values, that helps 140 * debugging. 141 */ 142 for (i=0; i<pci_bus_count; i++) 143 pci_to_OF_bus_map[i] = 0xff; 144 145 /* For each hose, we begin searching bridges */ 146 list_for_each_entry_safe(hose, tmp, &hose_list, list_node) { 147 struct device_node* node = hose->dn; 148 149 if (!node) 150 continue; 151 make_one_node_map(node, hose->first_busno); 152 } 153 dn = of_find_node_by_path("/"); 154 map_prop = of_find_property(dn, "pci-OF-bus-map", NULL); 155 if (map_prop) { 156 BUG_ON(pci_bus_count > map_prop->length); 157 memcpy(map_prop->value, pci_to_OF_bus_map, pci_bus_count); 158 } 159 of_node_put(dn); 160 #ifdef DEBUG 161 printk("PCI->OF bus map:\n"); 162 for (i=0; i<pci_bus_count; i++) { 163 if (pci_to_OF_bus_map[i] == 0xff) 164 continue; 165 printk("%d -> %d\n", i, pci_to_OF_bus_map[i]); 166 } 167 #endif 168 } 169 170 171 /* 172 * Returns the PCI device matching a given OF node 173 */ 174 int pci_device_from_OF_node(struct device_node *node, u8 *bus, u8 *devfn) 175 { 176 struct pci_dev *dev = NULL; 177 const __be32 *reg; 178 int size; 179 180 /* Check if it might have a chance to be a PCI device */ 181 if (!pci_find_hose_for_OF_device(node)) 182 return -ENODEV; 183 184 reg = of_get_property(node, "reg", &size); 185 if (!reg || size < 5 * sizeof(u32)) 186 return -ENODEV; 187 188 *bus = (be32_to_cpup(®[0]) >> 16) & 0xff; 189 *devfn = (be32_to_cpup(®[0]) >> 8) & 0xff; 190 191 /* Ok, here we need some tweak. If we have already renumbered 192 * all busses, we can't rely on the OF bus number any more. 193 * the pci_to_OF_bus_map is not enough as several PCI busses 194 * may match the same OF bus number. 195 */ 196 if (!pci_to_OF_bus_map) 197 return 0; 198 199 for_each_pci_dev(dev) 200 if (pci_to_OF_bus_map[dev->bus->number] == *bus && 201 dev->devfn == *devfn) { 202 *bus = dev->bus->number; 203 pci_dev_put(dev); 204 return 0; 205 } 206 207 return -ENODEV; 208 } 209 EXPORT_SYMBOL(pci_device_from_OF_node); 210 211 /* We create the "pci-OF-bus-map" property now so it appears in the 212 * /proc device tree 213 */ 214 void __init 215 pci_create_OF_bus_map(void) 216 { 217 struct property* of_prop; 218 struct device_node *dn; 219 220 of_prop = (struct property*) alloc_bootmem(sizeof(struct property) + 256); 221 if (!of_prop) 222 return; 223 dn = of_find_node_by_path("/"); 224 if (dn) { 225 memset(of_prop, -1, sizeof(struct property) + 256); 226 of_prop->name = "pci-OF-bus-map"; 227 of_prop->length = 256; 228 of_prop->value = &of_prop[1]; 229 prom_add_property(dn, of_prop); 230 of_node_put(dn); 231 } 232 } 233 234 void __devinit pcibios_setup_phb_io_space(struct pci_controller *hose) 235 { 236 unsigned long io_offset; 237 struct resource *res = &hose->io_resource; 238 239 /* Fixup IO space offset */ 240 io_offset = (unsigned long)hose->io_base_virt - isa_io_base; 241 res->start = (res->start + io_offset) & 0xffffffffu; 242 res->end = (res->end + io_offset) & 0xffffffffu; 243 } 244 245 static int __init pcibios_init(void) 246 { 247 struct pci_controller *hose, *tmp; 248 int next_busno = 0; 249 250 printk(KERN_INFO "PCI: Probing PCI hardware\n"); 251 252 if (ppc_pci_flags & PPC_PCI_REASSIGN_ALL_BUS) 253 pci_assign_all_buses = 1; 254 255 /* Scan all of the recorded PCI controllers. */ 256 list_for_each_entry_safe(hose, tmp, &hose_list, list_node) { 257 if (pci_assign_all_buses) 258 hose->first_busno = next_busno; 259 hose->last_busno = 0xff; 260 pcibios_scan_phb(hose); 261 pci_bus_add_devices(hose->bus); 262 if (pci_assign_all_buses || next_busno <= hose->last_busno) 263 next_busno = hose->last_busno + pcibios_assign_bus_offset; 264 } 265 pci_bus_count = next_busno; 266 267 /* OpenFirmware based machines need a map of OF bus 268 * numbers vs. kernel bus numbers since we may have to 269 * remap them. 270 */ 271 if (pci_assign_all_buses) 272 pcibios_make_OF_bus_map(); 273 274 /* Call common code to handle resource allocation */ 275 pcibios_resource_survey(); 276 277 /* Call machine dependent post-init code */ 278 if (ppc_md.pcibios_after_init) 279 ppc_md.pcibios_after_init(); 280 281 return 0; 282 } 283 284 subsys_initcall(pcibios_init); 285 286 static struct pci_controller* 287 pci_bus_to_hose(int bus) 288 { 289 struct pci_controller *hose, *tmp; 290 291 list_for_each_entry_safe(hose, tmp, &hose_list, list_node) 292 if (bus >= hose->first_busno && bus <= hose->last_busno) 293 return hose; 294 return NULL; 295 } 296 297 /* Provide information on locations of various I/O regions in physical 298 * memory. Do this on a per-card basis so that we choose the right 299 * root bridge. 300 * Note that the returned IO or memory base is a physical address 301 */ 302 303 long sys_pciconfig_iobase(long which, unsigned long bus, unsigned long devfn) 304 { 305 struct pci_controller* hose; 306 long result = -EOPNOTSUPP; 307 308 hose = pci_bus_to_hose(bus); 309 if (!hose) 310 return -ENODEV; 311 312 switch (which) { 313 case IOBASE_BRIDGE_NUMBER: 314 return (long)hose->first_busno; 315 case IOBASE_MEMORY: 316 return (long)hose->pci_mem_offset; 317 case IOBASE_IO: 318 return (long)hose->io_base_phys; 319 case IOBASE_ISA_IO: 320 return (long)isa_io_base; 321 case IOBASE_ISA_MEM: 322 return (long)isa_mem_base; 323 } 324 325 return result; 326 } 327 328 329