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 EXPORT_SYMBOL(isa_io_base); 36 EXPORT_SYMBOL(pci_dram_offset); 37 38 void pcibios_make_OF_bus_map(void); 39 40 static void fixup_cpc710_pci64(struct pci_dev* dev); 41 static u8* pci_to_OF_bus_map; 42 43 /* By default, we don't re-assign bus numbers. We do this only on 44 * some pmacs 45 */ 46 static int pci_assign_all_buses; 47 48 static int pci_bus_count; 49 50 /* This will remain NULL for now, until isa-bridge.c is made common 51 * to both 32-bit and 64-bit. 52 */ 53 struct pci_dev *isa_bridge_pcidev; 54 EXPORT_SYMBOL_GPL(isa_bridge_pcidev); 55 56 static void 57 fixup_cpc710_pci64(struct pci_dev* dev) 58 { 59 /* Hide the PCI64 BARs from the kernel as their content doesn't 60 * fit well in the resource management 61 */ 62 dev->resource[0].start = dev->resource[0].end = 0; 63 dev->resource[0].flags = 0; 64 dev->resource[1].start = dev->resource[1].end = 0; 65 dev->resource[1].flags = 0; 66 } 67 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_IBM, PCI_DEVICE_ID_IBM_CPC710_PCI64, fixup_cpc710_pci64); 68 69 /* 70 * Functions below are used on OpenFirmware machines. 71 */ 72 static void 73 make_one_node_map(struct device_node* node, u8 pci_bus) 74 { 75 const int *bus_range; 76 int len; 77 78 if (pci_bus >= pci_bus_count) 79 return; 80 bus_range = of_get_property(node, "bus-range", &len); 81 if (bus_range == NULL || len < 2 * sizeof(int)) { 82 printk(KERN_WARNING "Can't get bus-range for %s, " 83 "assuming it starts at 0\n", node->full_name); 84 pci_to_OF_bus_map[pci_bus] = 0; 85 } else 86 pci_to_OF_bus_map[pci_bus] = bus_range[0]; 87 88 for_each_child_of_node(node, node) { 89 struct pci_dev* dev; 90 const unsigned int *class_code, *reg; 91 92 class_code = of_get_property(node, "class-code", NULL); 93 if (!class_code || ((*class_code >> 8) != PCI_CLASS_BRIDGE_PCI && 94 (*class_code >> 8) != PCI_CLASS_BRIDGE_CARDBUS)) 95 continue; 96 reg = of_get_property(node, "reg", NULL); 97 if (!reg) 98 continue; 99 dev = pci_get_bus_and_slot(pci_bus, ((reg[0] >> 8) & 0xff)); 100 if (!dev || !dev->subordinate) { 101 pci_dev_put(dev); 102 continue; 103 } 104 make_one_node_map(node, dev->subordinate->number); 105 pci_dev_put(dev); 106 } 107 } 108 109 void 110 pcibios_make_OF_bus_map(void) 111 { 112 int i; 113 struct pci_controller *hose, *tmp; 114 struct property *map_prop; 115 struct device_node *dn; 116 117 pci_to_OF_bus_map = kmalloc(pci_bus_count, GFP_KERNEL); 118 if (!pci_to_OF_bus_map) { 119 printk(KERN_ERR "Can't allocate OF bus map !\n"); 120 return; 121 } 122 123 /* We fill the bus map with invalid values, that helps 124 * debugging. 125 */ 126 for (i=0; i<pci_bus_count; i++) 127 pci_to_OF_bus_map[i] = 0xff; 128 129 /* For each hose, we begin searching bridges */ 130 list_for_each_entry_safe(hose, tmp, &hose_list, list_node) { 131 struct device_node* node = hose->dn; 132 133 if (!node) 134 continue; 135 make_one_node_map(node, hose->first_busno); 136 } 137 dn = of_find_node_by_path("/"); 138 map_prop = of_find_property(dn, "pci-OF-bus-map", NULL); 139 if (map_prop) { 140 BUG_ON(pci_bus_count > map_prop->length); 141 memcpy(map_prop->value, pci_to_OF_bus_map, pci_bus_count); 142 } 143 of_node_put(dn); 144 #ifdef DEBUG 145 printk("PCI->OF bus map:\n"); 146 for (i=0; i<pci_bus_count; i++) { 147 if (pci_to_OF_bus_map[i] == 0xff) 148 continue; 149 printk("%d -> %d\n", i, pci_to_OF_bus_map[i]); 150 } 151 #endif 152 } 153 154 155 /* 156 * Returns the PCI device matching a given OF node 157 */ 158 int pci_device_from_OF_node(struct device_node *node, u8 *bus, u8 *devfn) 159 { 160 struct pci_dev *dev = NULL; 161 const __be32 *reg; 162 int size; 163 164 /* Check if it might have a chance to be a PCI device */ 165 if (!pci_find_hose_for_OF_device(node)) 166 return -ENODEV; 167 168 reg = of_get_property(node, "reg", &size); 169 if (!reg || size < 5 * sizeof(u32)) 170 return -ENODEV; 171 172 *bus = (be32_to_cpup(®[0]) >> 16) & 0xff; 173 *devfn = (be32_to_cpup(®[0]) >> 8) & 0xff; 174 175 /* Ok, here we need some tweak. If we have already renumbered 176 * all busses, we can't rely on the OF bus number any more. 177 * the pci_to_OF_bus_map is not enough as several PCI busses 178 * may match the same OF bus number. 179 */ 180 if (!pci_to_OF_bus_map) 181 return 0; 182 183 for_each_pci_dev(dev) 184 if (pci_to_OF_bus_map[dev->bus->number] == *bus && 185 dev->devfn == *devfn) { 186 *bus = dev->bus->number; 187 pci_dev_put(dev); 188 return 0; 189 } 190 191 return -ENODEV; 192 } 193 EXPORT_SYMBOL(pci_device_from_OF_node); 194 195 /* We create the "pci-OF-bus-map" property now so it appears in the 196 * /proc device tree 197 */ 198 void __init 199 pci_create_OF_bus_map(void) 200 { 201 struct property* of_prop; 202 struct device_node *dn; 203 204 of_prop = memblock_virt_alloc(sizeof(struct property) + 256, 0); 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