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 <linux/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 %pOF, " 83 "assuming it starts at 0\n", node); 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_domain_bus_and_slot(0, pci_bus, 100 ((reg[0] >> 8) & 0xff)); 101 if (!dev || !dev->subordinate) { 102 pci_dev_put(dev); 103 continue; 104 } 105 make_one_node_map(node, dev->subordinate->number); 106 pci_dev_put(dev); 107 } 108 } 109 110 void 111 pcibios_make_OF_bus_map(void) 112 { 113 int i; 114 struct pci_controller *hose, *tmp; 115 struct property *map_prop; 116 struct device_node *dn; 117 118 pci_to_OF_bus_map = kmalloc(pci_bus_count, GFP_KERNEL); 119 if (!pci_to_OF_bus_map) { 120 printk(KERN_ERR "Can't allocate OF bus map !\n"); 121 return; 122 } 123 124 /* We fill the bus map with invalid values, that helps 125 * debugging. 126 */ 127 for (i=0; i<pci_bus_count; i++) 128 pci_to_OF_bus_map[i] = 0xff; 129 130 /* For each hose, we begin searching bridges */ 131 list_for_each_entry_safe(hose, tmp, &hose_list, list_node) { 132 struct device_node* node = hose->dn; 133 134 if (!node) 135 continue; 136 make_one_node_map(node, hose->first_busno); 137 } 138 dn = of_find_node_by_path("/"); 139 map_prop = of_find_property(dn, "pci-OF-bus-map", NULL); 140 if (map_prop) { 141 BUG_ON(pci_bus_count > map_prop->length); 142 memcpy(map_prop->value, pci_to_OF_bus_map, pci_bus_count); 143 } 144 of_node_put(dn); 145 #ifdef DEBUG 146 printk("PCI->OF bus map:\n"); 147 for (i=0; i<pci_bus_count; i++) { 148 if (pci_to_OF_bus_map[i] == 0xff) 149 continue; 150 printk("%d -> %d\n", i, pci_to_OF_bus_map[i]); 151 } 152 #endif 153 } 154 155 156 /* 157 * Returns the PCI device matching a given OF node 158 */ 159 int pci_device_from_OF_node(struct device_node *node, u8 *bus, u8 *devfn) 160 { 161 struct pci_dev *dev = NULL; 162 const __be32 *reg; 163 int size; 164 165 /* Check if it might have a chance to be a PCI device */ 166 if (!pci_find_hose_for_OF_device(node)) 167 return -ENODEV; 168 169 reg = of_get_property(node, "reg", &size); 170 if (!reg || size < 5 * sizeof(u32)) 171 return -ENODEV; 172 173 *bus = (be32_to_cpup(®[0]) >> 16) & 0xff; 174 *devfn = (be32_to_cpup(®[0]) >> 8) & 0xff; 175 176 /* Ok, here we need some tweak. If we have already renumbered 177 * all busses, we can't rely on the OF bus number any more. 178 * the pci_to_OF_bus_map is not enough as several PCI busses 179 * may match the same OF bus number. 180 */ 181 if (!pci_to_OF_bus_map) 182 return 0; 183 184 for_each_pci_dev(dev) 185 if (pci_to_OF_bus_map[dev->bus->number] == *bus && 186 dev->devfn == *devfn) { 187 *bus = dev->bus->number; 188 pci_dev_put(dev); 189 return 0; 190 } 191 192 return -ENODEV; 193 } 194 EXPORT_SYMBOL(pci_device_from_OF_node); 195 196 /* We create the "pci-OF-bus-map" property now so it appears in the 197 * /proc device tree 198 */ 199 void __init 200 pci_create_OF_bus_map(void) 201 { 202 struct property* of_prop; 203 struct device_node *dn; 204 205 of_prop = memblock_virt_alloc(sizeof(struct property) + 256, 0); 206 dn = of_find_node_by_path("/"); 207 if (dn) { 208 memset(of_prop, -1, sizeof(struct property) + 256); 209 of_prop->name = "pci-OF-bus-map"; 210 of_prop->length = 256; 211 of_prop->value = &of_prop[1]; 212 of_add_property(dn, of_prop); 213 of_node_put(dn); 214 } 215 } 216 217 void pcibios_setup_phb_io_space(struct pci_controller *hose) 218 { 219 unsigned long io_offset; 220 struct resource *res = &hose->io_resource; 221 222 /* Fixup IO space offset */ 223 io_offset = pcibios_io_space_offset(hose); 224 res->start += io_offset; 225 res->end += io_offset; 226 } 227 228 static int __init pcibios_init(void) 229 { 230 struct pci_controller *hose, *tmp; 231 int next_busno = 0; 232 233 printk(KERN_INFO "PCI: Probing PCI hardware\n"); 234 235 if (pci_has_flag(PCI_REASSIGN_ALL_BUS)) 236 pci_assign_all_buses = 1; 237 238 /* Scan all of the recorded PCI controllers. */ 239 list_for_each_entry_safe(hose, tmp, &hose_list, list_node) { 240 if (pci_assign_all_buses) 241 hose->first_busno = next_busno; 242 hose->last_busno = 0xff; 243 pcibios_scan_phb(hose); 244 pci_bus_add_devices(hose->bus); 245 if (pci_assign_all_buses || next_busno <= hose->last_busno) 246 next_busno = hose->last_busno + pcibios_assign_bus_offset; 247 } 248 pci_bus_count = next_busno; 249 250 /* OpenFirmware based machines need a map of OF bus 251 * numbers vs. kernel bus numbers since we may have to 252 * remap them. 253 */ 254 if (pci_assign_all_buses) 255 pcibios_make_OF_bus_map(); 256 257 /* Call common code to handle resource allocation */ 258 pcibios_resource_survey(); 259 260 /* Call machine dependent post-init code */ 261 if (ppc_md.pcibios_after_init) 262 ppc_md.pcibios_after_init(); 263 264 return 0; 265 } 266 267 subsys_initcall(pcibios_init); 268 269 static struct pci_controller* 270 pci_bus_to_hose(int bus) 271 { 272 struct pci_controller *hose, *tmp; 273 274 list_for_each_entry_safe(hose, tmp, &hose_list, list_node) 275 if (bus >= hose->first_busno && bus <= hose->last_busno) 276 return hose; 277 return NULL; 278 } 279 280 /* Provide information on locations of various I/O regions in physical 281 * memory. Do this on a per-card basis so that we choose the right 282 * root bridge. 283 * Note that the returned IO or memory base is a physical address 284 */ 285 286 long sys_pciconfig_iobase(long which, unsigned long bus, unsigned long devfn) 287 { 288 struct pci_controller* hose; 289 long result = -EOPNOTSUPP; 290 291 hose = pci_bus_to_hose(bus); 292 if (!hose) 293 return -ENODEV; 294 295 switch (which) { 296 case IOBASE_BRIDGE_NUMBER: 297 return (long)hose->first_busno; 298 case IOBASE_MEMORY: 299 return (long)hose->mem_offset[0]; 300 case IOBASE_IO: 301 return (long)hose->io_base_phys; 302 case IOBASE_ISA_IO: 303 return (long)isa_io_base; 304 case IOBASE_ISA_MEM: 305 return (long)isa_mem_base; 306 } 307 308 return result; 309 } 310 311 312