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 void __init pcibios_make_OF_bus_map(void); 40 41 static void fixup_cpc710_pci64(struct pci_dev* dev); 42 static u8* pci_to_OF_bus_map; 43 44 /* By default, we don't re-assign bus numbers. We do this only on 45 * some pmacs 46 */ 47 static int pci_assign_all_buses; 48 49 static int pci_bus_count; 50 51 /* This will remain NULL for now, until isa-bridge.c is made common 52 * to both 32-bit and 64-bit. 53 */ 54 struct pci_dev *isa_bridge_pcidev; 55 EXPORT_SYMBOL_GPL(isa_bridge_pcidev); 56 57 static void 58 fixup_cpc710_pci64(struct pci_dev* dev) 59 { 60 /* Hide the PCI64 BARs from the kernel as their content doesn't 61 * fit well in the resource management 62 */ 63 dev->resource[0].start = dev->resource[0].end = 0; 64 dev->resource[0].flags = 0; 65 dev->resource[1].start = dev->resource[1].end = 0; 66 dev->resource[1].flags = 0; 67 } 68 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_IBM, PCI_DEVICE_ID_IBM_CPC710_PCI64, fixup_cpc710_pci64); 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 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 /* 158 * Returns the PCI device matching a given OF node 159 */ 160 int pci_device_from_OF_node(struct device_node *node, u8 *bus, u8 *devfn) 161 { 162 struct pci_dev *dev = NULL; 163 const __be32 *reg; 164 int size; 165 166 /* Check if it might have a chance to be a PCI device */ 167 if (!pci_find_hose_for_OF_device(node)) 168 return -ENODEV; 169 170 reg = of_get_property(node, "reg", &size); 171 if (!reg || size < 5 * sizeof(u32)) 172 return -ENODEV; 173 174 *bus = (be32_to_cpup(®[0]) >> 16) & 0xff; 175 *devfn = (be32_to_cpup(®[0]) >> 8) & 0xff; 176 177 /* Ok, here we need some tweak. If we have already renumbered 178 * all busses, we can't rely on the OF bus number any more. 179 * the pci_to_OF_bus_map is not enough as several PCI busses 180 * may match the same OF bus number. 181 */ 182 if (!pci_to_OF_bus_map) 183 return 0; 184 185 for_each_pci_dev(dev) 186 if (pci_to_OF_bus_map[dev->bus->number] == *bus && 187 dev->devfn == *devfn) { 188 *bus = dev->bus->number; 189 pci_dev_put(dev); 190 return 0; 191 } 192 193 return -ENODEV; 194 } 195 EXPORT_SYMBOL(pci_device_from_OF_node); 196 197 /* We create the "pci-OF-bus-map" property now so it appears in the 198 * /proc device tree 199 */ 200 void __init 201 pci_create_OF_bus_map(void) 202 { 203 struct property* of_prop; 204 struct device_node *dn; 205 206 of_prop = memblock_alloc(sizeof(struct property) + 256, 207 SMP_CACHE_BYTES); 208 if (!of_prop) 209 panic("%s: Failed to allocate %zu bytes\n", __func__, 210 sizeof(struct property) + 256); 211 dn = of_find_node_by_path("/"); 212 if (dn) { 213 memset(of_prop, -1, sizeof(struct property) + 256); 214 of_prop->name = "pci-OF-bus-map"; 215 of_prop->length = 256; 216 of_prop->value = &of_prop[1]; 217 of_add_property(dn, of_prop); 218 of_node_put(dn); 219 } 220 } 221 222 void pcibios_setup_phb_io_space(struct pci_controller *hose) 223 { 224 unsigned long io_offset; 225 struct resource *res = &hose->io_resource; 226 227 /* Fixup IO space offset */ 228 io_offset = pcibios_io_space_offset(hose); 229 res->start += io_offset; 230 res->end += io_offset; 231 } 232 233 static int __init pcibios_init(void) 234 { 235 struct pci_controller *hose, *tmp; 236 int next_busno = 0; 237 238 printk(KERN_INFO "PCI: Probing PCI hardware\n"); 239 240 if (pci_has_flag(PCI_REASSIGN_ALL_BUS)) 241 pci_assign_all_buses = 1; 242 243 /* Scan all of the recorded PCI controllers. */ 244 list_for_each_entry_safe(hose, tmp, &hose_list, list_node) { 245 if (pci_assign_all_buses) 246 hose->first_busno = next_busno; 247 hose->last_busno = 0xff; 248 pcibios_scan_phb(hose); 249 pci_bus_add_devices(hose->bus); 250 if (pci_assign_all_buses || next_busno <= hose->last_busno) 251 next_busno = hose->last_busno + pcibios_assign_bus_offset; 252 } 253 pci_bus_count = next_busno; 254 255 /* OpenFirmware based machines need a map of OF bus 256 * numbers vs. kernel bus numbers since we may have to 257 * remap them. 258 */ 259 if (pci_assign_all_buses) 260 pcibios_make_OF_bus_map(); 261 262 /* Call common code to handle resource allocation */ 263 pcibios_resource_survey(); 264 265 /* Call machine dependent fixup */ 266 if (ppc_md.pcibios_fixup) 267 ppc_md.pcibios_fixup(); 268 269 /* Call machine dependent post-init code */ 270 if (ppc_md.pcibios_after_init) 271 ppc_md.pcibios_after_init(); 272 273 return 0; 274 } 275 276 subsys_initcall(pcibios_init); 277 278 static struct pci_controller* 279 pci_bus_to_hose(int bus) 280 { 281 struct pci_controller *hose, *tmp; 282 283 list_for_each_entry_safe(hose, tmp, &hose_list, list_node) 284 if (bus >= hose->first_busno && bus <= hose->last_busno) 285 return hose; 286 return NULL; 287 } 288 289 /* Provide information on locations of various I/O regions in physical 290 * memory. Do this on a per-card basis so that we choose the right 291 * root bridge. 292 * Note that the returned IO or memory base is a physical address 293 */ 294 295 SYSCALL_DEFINE3(pciconfig_iobase, long, which, 296 unsigned long, bus, unsigned long, devfn) 297 { 298 struct pci_controller* hose; 299 long result = -EOPNOTSUPP; 300 301 hose = pci_bus_to_hose(bus); 302 if (!hose) 303 return -ENODEV; 304 305 switch (which) { 306 case IOBASE_BRIDGE_NUMBER: 307 return (long)hose->first_busno; 308 case IOBASE_MEMORY: 309 return (long)hose->mem_offset[0]; 310 case IOBASE_IO: 311 return (long)hose->io_base_phys; 312 case IOBASE_ISA_IO: 313 return (long)isa_io_base; 314 case IOBASE_ISA_MEM: 315 return (long)isa_mem_base; 316 } 317 318 return result; 319 } 320