1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Common pmac/prep/chrp pci routines. -- Cort 4 */ 5 6 #include <linux/kernel.h> 7 #include <linux/pci.h> 8 #include <linux/delay.h> 9 #include <linux/string.h> 10 #include <linux/init.h> 11 #include <linux/capability.h> 12 #include <linux/sched.h> 13 #include <linux/errno.h> 14 #include <linux/memblock.h> 15 #include <linux/syscalls.h> 16 #include <linux/irq.h> 17 #include <linux/list.h> 18 #include <linux/of.h> 19 #include <linux/slab.h> 20 #include <linux/export.h> 21 22 #include <asm/processor.h> 23 #include <asm/io.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 static void fixup_cpc710_pci64(struct pci_dev* dev); 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 /* This will remain NULL for now, until isa-bridge.c is made common 47 * to both 32-bit and 64-bit. 48 */ 49 struct pci_dev *isa_bridge_pcidev; 50 EXPORT_SYMBOL_GPL(isa_bridge_pcidev); 51 52 static void 53 fixup_cpc710_pci64(struct pci_dev* dev) 54 { 55 /* Hide the PCI64 BARs from the kernel as their content doesn't 56 * fit well in the resource management 57 */ 58 dev->resource[0].start = dev->resource[0].end = 0; 59 dev->resource[0].flags = 0; 60 dev->resource[1].start = dev->resource[1].end = 0; 61 dev->resource[1].flags = 0; 62 } 63 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_IBM, PCI_DEVICE_ID_IBM_CPC710_PCI64, fixup_cpc710_pci64); 64 65 #ifdef CONFIG_PPC_PCI_OF_BUS_MAP 66 67 static u8* pci_to_OF_bus_map; 68 static int pci_bus_count; 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 static void __init 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 #endif // CONFIG_PPC_PCI_OF_BUS_MAP 156 157 158 #ifdef CONFIG_PPC_PMAC 159 /* 160 * Returns the PCI device matching a given OF node 161 */ 162 int pci_device_from_OF_node(struct device_node *node, u8 *bus, u8 *devfn) 163 { 164 #ifdef CONFIG_PPC_PCI_OF_BUS_MAP 165 struct pci_dev *dev = NULL; 166 #endif 167 const __be32 *reg; 168 int size; 169 170 /* Check if it might have a chance to be a PCI device */ 171 if (!pci_find_hose_for_OF_device(node)) 172 return -ENODEV; 173 174 reg = of_get_property(node, "reg", &size); 175 if (!reg || size < 5 * sizeof(u32)) 176 return -ENODEV; 177 178 *bus = (be32_to_cpup(®[0]) >> 16) & 0xff; 179 *devfn = (be32_to_cpup(®[0]) >> 8) & 0xff; 180 181 #ifndef CONFIG_PPC_PCI_OF_BUS_MAP 182 return 0; 183 #else 184 /* Ok, here we need some tweak. If we have already renumbered 185 * all busses, we can't rely on the OF bus number any more. 186 * the pci_to_OF_bus_map is not enough as several PCI busses 187 * may match the same OF bus number. 188 */ 189 if (!pci_to_OF_bus_map) 190 return 0; 191 192 for_each_pci_dev(dev) 193 if (pci_to_OF_bus_map[dev->bus->number] == *bus && 194 dev->devfn == *devfn) { 195 *bus = dev->bus->number; 196 pci_dev_put(dev); 197 return 0; 198 } 199 200 return -ENODEV; 201 #endif // CONFIG_PPC_PCI_OF_BUS_MAP 202 } 203 EXPORT_SYMBOL(pci_device_from_OF_node); 204 #endif 205 206 #ifdef CONFIG_PPC_PCI_OF_BUS_MAP 207 /* We create the "pci-OF-bus-map" property now so it appears in the 208 * /proc device tree 209 */ 210 void __init 211 pci_create_OF_bus_map(void) 212 { 213 struct property* of_prop; 214 struct device_node *dn; 215 216 of_prop = memblock_alloc_or_panic(sizeof(struct property) + 256, 217 SMP_CACHE_BYTES); 218 dn = of_find_node_by_path("/"); 219 if (dn) { 220 memset(of_prop, -1, sizeof(struct property) + 256); 221 of_prop->name = "pci-OF-bus-map"; 222 of_prop->length = 256; 223 of_prop->value = &of_prop[1]; 224 of_add_property(dn, of_prop); 225 of_node_put(dn); 226 } 227 } 228 #endif // CONFIG_PPC_PCI_OF_BUS_MAP 229 230 void pcibios_setup_phb_io_space(struct pci_controller *hose) 231 { 232 unsigned long io_offset; 233 struct resource *res = &hose->io_resource; 234 235 /* Fixup IO space offset */ 236 io_offset = pcibios_io_space_offset(hose); 237 res->start += io_offset; 238 res->end += io_offset; 239 } 240 241 static int __init pcibios_init(void) 242 { 243 struct pci_controller *hose, *tmp; 244 #ifndef CONFIG_PPC_PCI_BUS_NUM_DOMAIN_DEPENDENT 245 int next_busno = 0; 246 #endif 247 248 printk(KERN_INFO "PCI: Probing PCI hardware\n"); 249 250 #ifdef CONFIG_PPC_PCI_BUS_NUM_DOMAIN_DEPENDENT 251 /* 252 * Enable PCI domains in /proc when PCI bus numbers are not unique 253 * across all PCI domains to prevent conflicts. And keep PCI domain 0 254 * backward compatible in /proc for video cards. 255 */ 256 pci_add_flags(PCI_ENABLE_PROC_DOMAINS | PCI_COMPAT_DOMAIN_0); 257 #endif 258 259 if (pci_has_flag(PCI_REASSIGN_ALL_BUS)) 260 pci_assign_all_buses = 1; 261 262 /* Scan all of the recorded PCI controllers. */ 263 list_for_each_entry_safe(hose, tmp, &hose_list, list_node) { 264 #ifndef CONFIG_PPC_PCI_BUS_NUM_DOMAIN_DEPENDENT 265 if (pci_assign_all_buses) 266 hose->first_busno = next_busno; 267 #endif 268 hose->last_busno = 0xff; 269 pcibios_scan_phb(hose); 270 pci_bus_add_devices(hose->bus); 271 #ifndef CONFIG_PPC_PCI_BUS_NUM_DOMAIN_DEPENDENT 272 if (pci_assign_all_buses || next_busno <= hose->last_busno) 273 next_busno = hose->last_busno + pcibios_assign_bus_offset; 274 #endif 275 } 276 277 #if defined(CONFIG_PPC_PMAC) || defined(CONFIG_PPC_CHRP) 278 #ifdef CONFIG_PPC_PCI_OF_BUS_MAP 279 pci_bus_count = next_busno; 280 281 /* OpenFirmware based machines need a map of OF bus 282 * numbers vs. kernel bus numbers since we may have to 283 * remap them. 284 */ 285 if (pci_assign_all_buses) 286 pcibios_make_OF_bus_map(); 287 #endif 288 #endif 289 290 /* Call common code to handle resource allocation */ 291 pcibios_resource_survey(); 292 293 /* Call machine dependent fixup */ 294 if (ppc_md.pcibios_fixup) 295 ppc_md.pcibios_fixup(); 296 297 /* Call machine dependent post-init code */ 298 if (ppc_md.pcibios_after_init) 299 ppc_md.pcibios_after_init(); 300 301 return 0; 302 } 303 304 subsys_initcall(pcibios_init); 305 306 static struct pci_controller* 307 pci_bus_to_hose(int bus) 308 { 309 struct pci_controller *hose, *tmp; 310 311 list_for_each_entry_safe(hose, tmp, &hose_list, list_node) 312 if (bus >= hose->first_busno && bus <= hose->last_busno) 313 return hose; 314 return NULL; 315 } 316 317 /* Provide information on locations of various I/O regions in physical 318 * memory. Do this on a per-card basis so that we choose the right 319 * root bridge. 320 * Note that the returned IO or memory base is a physical address 321 */ 322 323 SYSCALL_DEFINE3(pciconfig_iobase, long, which, 324 unsigned long, bus, unsigned long, devfn) 325 { 326 struct pci_controller* hose; 327 long result = -EOPNOTSUPP; 328 329 hose = pci_bus_to_hose(bus); 330 if (!hose) 331 return -ENODEV; 332 333 switch (which) { 334 case IOBASE_BRIDGE_NUMBER: 335 return (long)hose->first_busno; 336 case IOBASE_MEMORY: 337 return (long)hose->mem_offset[0]; 338 case IOBASE_IO: 339 return (long)hose->io_base_phys; 340 case IOBASE_ISA_IO: 341 return (long)isa_io_base; 342 case IOBASE_ISA_MEM: 343 return (long)isa_mem_base; 344 } 345 346 return result; 347 } 348