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 #if defined(CONFIG_PPC_PMAC) || defined(CONFIG_PPC_CHRP) 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 } 155 156 157 #ifdef CONFIG_PPC_PMAC 158 /* 159 * Returns the PCI device matching a given OF node 160 */ 161 int pci_device_from_OF_node(struct device_node *node, u8 *bus, u8 *devfn) 162 { 163 struct pci_dev *dev = NULL; 164 const __be32 *reg; 165 int size; 166 167 /* Check if it might have a chance to be a PCI device */ 168 if (!pci_find_hose_for_OF_device(node)) 169 return -ENODEV; 170 171 reg = of_get_property(node, "reg", &size); 172 if (!reg || size < 5 * sizeof(u32)) 173 return -ENODEV; 174 175 *bus = (be32_to_cpup(®[0]) >> 16) & 0xff; 176 *devfn = (be32_to_cpup(®[0]) >> 8) & 0xff; 177 178 /* Ok, here we need some tweak. If we have already renumbered 179 * all busses, we can't rely on the OF bus number any more. 180 * the pci_to_OF_bus_map is not enough as several PCI busses 181 * may match the same OF bus number. 182 */ 183 if (!pci_to_OF_bus_map) 184 return 0; 185 186 for_each_pci_dev(dev) 187 if (pci_to_OF_bus_map[dev->bus->number] == *bus && 188 dev->devfn == *devfn) { 189 *bus = dev->bus->number; 190 pci_dev_put(dev); 191 return 0; 192 } 193 194 return -ENODEV; 195 } 196 EXPORT_SYMBOL(pci_device_from_OF_node); 197 #endif 198 199 #ifdef CONFIG_PPC_CHRP 200 /* We create the "pci-OF-bus-map" property now so it appears in the 201 * /proc device tree 202 */ 203 void __init 204 pci_create_OF_bus_map(void) 205 { 206 struct property* of_prop; 207 struct device_node *dn; 208 209 of_prop = memblock_alloc(sizeof(struct property) + 256, 210 SMP_CACHE_BYTES); 211 if (!of_prop) 212 panic("%s: Failed to allocate %zu bytes\n", __func__, 213 sizeof(struct property) + 256); 214 dn = of_find_node_by_path("/"); 215 if (dn) { 216 memset(of_prop, -1, sizeof(struct property) + 256); 217 of_prop->name = "pci-OF-bus-map"; 218 of_prop->length = 256; 219 of_prop->value = &of_prop[1]; 220 of_add_property(dn, of_prop); 221 of_node_put(dn); 222 } 223 } 224 #endif 225 226 #endif /* defined(CONFIG_PPC_PMAC) || defined(CONFIG_PPC_CHRP) */ 227 228 void pcibios_setup_phb_io_space(struct pci_controller *hose) 229 { 230 unsigned long io_offset; 231 struct resource *res = &hose->io_resource; 232 233 /* Fixup IO space offset */ 234 io_offset = pcibios_io_space_offset(hose); 235 res->start += io_offset; 236 res->end += io_offset; 237 } 238 239 static int __init pcibios_init(void) 240 { 241 struct pci_controller *hose, *tmp; 242 #ifndef CONFIG_PPC_PCI_BUS_NUM_DOMAIN_DEPENDENT 243 int next_busno = 0; 244 #endif 245 246 printk(KERN_INFO "PCI: Probing PCI hardware\n"); 247 248 #ifdef CONFIG_PPC_PCI_BUS_NUM_DOMAIN_DEPENDENT 249 /* 250 * Enable PCI domains in /proc when PCI bus numbers are not unique 251 * across all PCI domains to prevent conflicts. And keep PCI domain 0 252 * backward compatible in /proc for video cards. 253 */ 254 pci_add_flags(PCI_ENABLE_PROC_DOMAINS | PCI_COMPAT_DOMAIN_0); 255 #endif 256 257 if (pci_has_flag(PCI_REASSIGN_ALL_BUS)) 258 pci_assign_all_buses = 1; 259 260 /* Scan all of the recorded PCI controllers. */ 261 list_for_each_entry_safe(hose, tmp, &hose_list, list_node) { 262 #ifndef CONFIG_PPC_PCI_BUS_NUM_DOMAIN_DEPENDENT 263 if (pci_assign_all_buses) 264 hose->first_busno = next_busno; 265 #endif 266 hose->last_busno = 0xff; 267 pcibios_scan_phb(hose); 268 pci_bus_add_devices(hose->bus); 269 #ifndef CONFIG_PPC_PCI_BUS_NUM_DOMAIN_DEPENDENT 270 if (pci_assign_all_buses || next_busno <= hose->last_busno) 271 next_busno = hose->last_busno + pcibios_assign_bus_offset; 272 #endif 273 } 274 275 #if defined(CONFIG_PPC_PMAC) || defined(CONFIG_PPC_CHRP) 276 pci_bus_count = next_busno; 277 278 /* OpenFirmware based machines need a map of OF bus 279 * numbers vs. kernel bus numbers since we may have to 280 * remap them. 281 */ 282 if (pci_assign_all_buses) 283 pcibios_make_OF_bus_map(); 284 #endif 285 286 /* Call common code to handle resource allocation */ 287 pcibios_resource_survey(); 288 289 /* Call machine dependent fixup */ 290 if (ppc_md.pcibios_fixup) 291 ppc_md.pcibios_fixup(); 292 293 /* Call machine dependent post-init code */ 294 if (ppc_md.pcibios_after_init) 295 ppc_md.pcibios_after_init(); 296 297 return 0; 298 } 299 300 subsys_initcall(pcibios_init); 301 302 static struct pci_controller* 303 pci_bus_to_hose(int bus) 304 { 305 struct pci_controller *hose, *tmp; 306 307 list_for_each_entry_safe(hose, tmp, &hose_list, list_node) 308 if (bus >= hose->first_busno && bus <= hose->last_busno) 309 return hose; 310 return NULL; 311 } 312 313 /* Provide information on locations of various I/O regions in physical 314 * memory. Do this on a per-card basis so that we choose the right 315 * root bridge. 316 * Note that the returned IO or memory base is a physical address 317 */ 318 319 SYSCALL_DEFINE3(pciconfig_iobase, long, which, 320 unsigned long, bus, unsigned long, devfn) 321 { 322 struct pci_controller* hose; 323 long result = -EOPNOTSUPP; 324 325 hose = pci_bus_to_hose(bus); 326 if (!hose) 327 return -ENODEV; 328 329 switch (which) { 330 case IOBASE_BRIDGE_NUMBER: 331 return (long)hose->first_busno; 332 case IOBASE_MEMORY: 333 return (long)hose->mem_offset[0]; 334 case IOBASE_IO: 335 return (long)hose->io_base_phys; 336 case IOBASE_ISA_IO: 337 return (long)isa_io_base; 338 case IOBASE_ISA_MEM: 339 return (long)isa_mem_base; 340 } 341 342 return result; 343 } 344