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