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/prom.h> 25 #include <asm/sections.h> 26 #include <asm/pci-bridge.h> 27 #include <asm/ppc-pci.h> 28 #include <asm/byteorder.h> 29 #include <linux/uaccess.h> 30 #include <asm/machdep.h> 31 32 #undef DEBUG 33 34 unsigned long isa_io_base = 0; 35 unsigned long pci_dram_offset = 0; 36 int pcibios_assign_bus_offset = 1; 37 EXPORT_SYMBOL(isa_io_base); 38 EXPORT_SYMBOL(pci_dram_offset); 39 40 void pcibios_make_OF_bus_map(void); 41 42 static void fixup_cpc710_pci64(struct pci_dev* dev); 43 static u8* pci_to_OF_bus_map; 44 45 /* By default, we don't re-assign bus numbers. We do this only on 46 * some pmacs 47 */ 48 static int pci_assign_all_buses; 49 50 static int pci_bus_count; 51 52 /* This will remain NULL for now, until isa-bridge.c is made common 53 * to both 32-bit and 64-bit. 54 */ 55 struct pci_dev *isa_bridge_pcidev; 56 EXPORT_SYMBOL_GPL(isa_bridge_pcidev); 57 58 static void 59 fixup_cpc710_pci64(struct pci_dev* dev) 60 { 61 /* Hide the PCI64 BARs from the kernel as their content doesn't 62 * fit well in the resource management 63 */ 64 dev->resource[0].start = dev->resource[0].end = 0; 65 dev->resource[0].flags = 0; 66 dev->resource[1].start = dev->resource[1].end = 0; 67 dev->resource[1].flags = 0; 68 } 69 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_IBM, PCI_DEVICE_ID_IBM_CPC710_PCI64, fixup_cpc710_pci64); 70 71 /* 72 * Functions below are used on OpenFirmware machines. 73 */ 74 static void 75 make_one_node_map(struct device_node* node, u8 pci_bus) 76 { 77 const int *bus_range; 78 int len; 79 80 if (pci_bus >= pci_bus_count) 81 return; 82 bus_range = of_get_property(node, "bus-range", &len); 83 if (bus_range == NULL || len < 2 * sizeof(int)) { 84 printk(KERN_WARNING "Can't get bus-range for %pOF, " 85 "assuming it starts at 0\n", node); 86 pci_to_OF_bus_map[pci_bus] = 0; 87 } else 88 pci_to_OF_bus_map[pci_bus] = bus_range[0]; 89 90 for_each_child_of_node(node, node) { 91 struct pci_dev* dev; 92 const unsigned int *class_code, *reg; 93 94 class_code = of_get_property(node, "class-code", NULL); 95 if (!class_code || ((*class_code >> 8) != PCI_CLASS_BRIDGE_PCI && 96 (*class_code >> 8) != PCI_CLASS_BRIDGE_CARDBUS)) 97 continue; 98 reg = of_get_property(node, "reg", NULL); 99 if (!reg) 100 continue; 101 dev = pci_get_domain_bus_and_slot(0, pci_bus, 102 ((reg[0] >> 8) & 0xff)); 103 if (!dev || !dev->subordinate) { 104 pci_dev_put(dev); 105 continue; 106 } 107 make_one_node_map(node, dev->subordinate->number); 108 pci_dev_put(dev); 109 } 110 } 111 112 void 113 pcibios_make_OF_bus_map(void) 114 { 115 int i; 116 struct pci_controller *hose, *tmp; 117 struct property *map_prop; 118 struct device_node *dn; 119 120 pci_to_OF_bus_map = kmalloc(pci_bus_count, GFP_KERNEL); 121 if (!pci_to_OF_bus_map) { 122 printk(KERN_ERR "Can't allocate OF bus map !\n"); 123 return; 124 } 125 126 /* We fill the bus map with invalid values, that helps 127 * debugging. 128 */ 129 for (i=0; i<pci_bus_count; i++) 130 pci_to_OF_bus_map[i] = 0xff; 131 132 /* For each hose, we begin searching bridges */ 133 list_for_each_entry_safe(hose, tmp, &hose_list, list_node) { 134 struct device_node* node = hose->dn; 135 136 if (!node) 137 continue; 138 make_one_node_map(node, hose->first_busno); 139 } 140 dn = of_find_node_by_path("/"); 141 map_prop = of_find_property(dn, "pci-OF-bus-map", NULL); 142 if (map_prop) { 143 BUG_ON(pci_bus_count > map_prop->length); 144 memcpy(map_prop->value, pci_to_OF_bus_map, pci_bus_count); 145 } 146 of_node_put(dn); 147 #ifdef DEBUG 148 printk("PCI->OF bus map:\n"); 149 for (i=0; i<pci_bus_count; i++) { 150 if (pci_to_OF_bus_map[i] == 0xff) 151 continue; 152 printk("%d -> %d\n", i, pci_to_OF_bus_map[i]); 153 } 154 #endif 155 } 156 157 158 /* 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); 197 198 /* We create the "pci-OF-bus-map" property now so it appears in the 199 * /proc device tree 200 */ 201 void __init 202 pci_create_OF_bus_map(void) 203 { 204 struct property* of_prop; 205 struct device_node *dn; 206 207 of_prop = memblock_alloc(sizeof(struct property) + 256, 208 SMP_CACHE_BYTES); 209 if (!of_prop) 210 panic("%s: Failed to allocate %zu bytes\n", __func__, 211 sizeof(struct property) + 256); 212 dn = of_find_node_by_path("/"); 213 if (dn) { 214 memset(of_prop, -1, sizeof(struct property) + 256); 215 of_prop->name = "pci-OF-bus-map"; 216 of_prop->length = 256; 217 of_prop->value = &of_prop[1]; 218 of_add_property(dn, of_prop); 219 of_node_put(dn); 220 } 221 } 222 223 void pcibios_setup_phb_io_space(struct pci_controller *hose) 224 { 225 unsigned long io_offset; 226 struct resource *res = &hose->io_resource; 227 228 /* Fixup IO space offset */ 229 io_offset = pcibios_io_space_offset(hose); 230 res->start += io_offset; 231 res->end += io_offset; 232 } 233 234 static int __init pcibios_init(void) 235 { 236 struct pci_controller *hose, *tmp; 237 int next_busno = 0; 238 239 printk(KERN_INFO "PCI: Probing PCI hardware\n"); 240 241 if (pci_has_flag(PCI_REASSIGN_ALL_BUS)) 242 pci_assign_all_buses = 1; 243 244 /* Scan all of the recorded PCI controllers. */ 245 list_for_each_entry_safe(hose, tmp, &hose_list, list_node) { 246 if (pci_assign_all_buses) 247 hose->first_busno = next_busno; 248 hose->last_busno = 0xff; 249 pcibios_scan_phb(hose); 250 pci_bus_add_devices(hose->bus); 251 if (pci_assign_all_buses || next_busno <= hose->last_busno) 252 next_busno = hose->last_busno + pcibios_assign_bus_offset; 253 } 254 pci_bus_count = next_busno; 255 256 /* OpenFirmware based machines need a map of OF bus 257 * numbers vs. kernel bus numbers since we may have to 258 * remap them. 259 */ 260 if (pci_assign_all_buses) 261 pcibios_make_OF_bus_map(); 262 263 /* Call common code to handle resource allocation */ 264 pcibios_resource_survey(); 265 266 /* Call machine dependent fixup */ 267 if (ppc_md.pcibios_fixup) 268 ppc_md.pcibios_fixup(); 269 270 /* Call machine dependent post-init code */ 271 if (ppc_md.pcibios_after_init) 272 ppc_md.pcibios_after_init(); 273 274 return 0; 275 } 276 277 subsys_initcall(pcibios_init); 278 279 static struct pci_controller* 280 pci_bus_to_hose(int bus) 281 { 282 struct pci_controller *hose, *tmp; 283 284 list_for_each_entry_safe(hose, tmp, &hose_list, list_node) 285 if (bus >= hose->first_busno && bus <= hose->last_busno) 286 return hose; 287 return NULL; 288 } 289 290 /* Provide information on locations of various I/O regions in physical 291 * memory. Do this on a per-card basis so that we choose the right 292 * root bridge. 293 * Note that the returned IO or memory base is a physical address 294 */ 295 296 SYSCALL_DEFINE3(pciconfig_iobase, long, which, 297 unsigned long, bus, unsigned long, devfn) 298 { 299 struct pci_controller* hose; 300 long result = -EOPNOTSUPP; 301 302 hose = pci_bus_to_hose(bus); 303 if (!hose) 304 return -ENODEV; 305 306 switch (which) { 307 case IOBASE_BRIDGE_NUMBER: 308 return (long)hose->first_busno; 309 case IOBASE_MEMORY: 310 return (long)hose->mem_offset[0]; 311 case IOBASE_IO: 312 return (long)hose->io_base_phys; 313 case IOBASE_ISA_IO: 314 return (long)isa_io_base; 315 case IOBASE_ISA_MEM: 316 return (long)isa_mem_base; 317 } 318 319 return result; 320 } 321