| 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 <asm/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 | |
| 36 | void pcibios_make_OF_bus_map(void); |
| 37 | |
| 38 | static void fixup_cpc710_pci64(struct pci_dev* dev); |
| 39 | static u8* pci_to_OF_bus_map; |
| 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 | static int pci_bus_count; |
| 47 | |
| 48 | /* This will remain NULL for now, until isa-bridge.c is made common |
| 49 | * to both 32-bit and 64-bit. |
| 50 | */ |
| 51 | struct pci_dev *isa_bridge_pcidev; |
| 52 | EXPORT_SYMBOL_GPL(isa_bridge_pcidev); |
| 53 | |
| 54 | static void |
| 55 | fixup_cpc710_pci64(struct pci_dev* dev) |
| 56 | { |
| 57 | /* Hide the PCI64 BARs from the kernel as their content doesn't |
| 58 | * fit well in the resource management |
| 59 | */ |
| 60 | dev->resource[0].start = dev->resource[0].end = 0; |
| 61 | dev->resource[0].flags = 0; |
| 62 | dev->resource[1].start = dev->resource[1].end = 0; |
| 63 | dev->resource[1].flags = 0; |
| 64 | } |
| 65 | DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_IBM, PCI_DEVICE_ID_IBM_CPC710_PCI64, fixup_cpc710_pci64); |
| 66 | |
| 67 | /* |
| 68 | * Functions below are used on OpenFirmware machines. |
| 69 | */ |
| 70 | static void |
| 71 | make_one_node_map(struct device_node* node, u8 pci_bus) |
| 72 | { |
| 73 | const int *bus_range; |
| 74 | int len; |
| 75 | |
| 76 | if (pci_bus >= pci_bus_count) |
| 77 | return; |
| 78 | bus_range = of_get_property(node, "bus-range", &len); |
| 79 | if (bus_range == NULL || len < 2 * sizeof(int)) { |
| 80 | printk(KERN_WARNING "Can't get bus-range for %s, " |
| 81 | "assuming it starts at 0\n", node->full_name); |
| 82 | pci_to_OF_bus_map[pci_bus] = 0; |
| 83 | } else |
| 84 | pci_to_OF_bus_map[pci_bus] = bus_range[0]; |
| 85 | |
| 86 | for_each_child_of_node(node, node) { |
| 87 | struct pci_dev* dev; |
| 88 | const unsigned int *class_code, *reg; |
| 89 | |
| 90 | class_code = of_get_property(node, "class-code", NULL); |
| 91 | if (!class_code || ((*class_code >> 8) != PCI_CLASS_BRIDGE_PCI && |
| 92 | (*class_code >> 8) != PCI_CLASS_BRIDGE_CARDBUS)) |
| 93 | continue; |
| 94 | reg = of_get_property(node, "reg", NULL); |
| 95 | if (!reg) |
| 96 | continue; |
| 97 | dev = pci_get_bus_and_slot(pci_bus, ((reg[0] >> 8) & 0xff)); |
| 98 | if (!dev || !dev->subordinate) { |
| 99 | pci_dev_put(dev); |
| 100 | continue; |
| 101 | } |
| 102 | make_one_node_map(node, dev->subordinate->number); |
| 103 | pci_dev_put(dev); |
| 104 | } |
| 105 | } |
| 106 | |
| 107 | void |
| 108 | pcibios_make_OF_bus_map(void) |
| 109 | { |
| 110 | int i; |
| 111 | struct pci_controller *hose, *tmp; |
| 112 | struct property *map_prop; |
| 113 | struct device_node *dn; |
| 114 | |
| 115 | pci_to_OF_bus_map = kmalloc(pci_bus_count, GFP_KERNEL); |
| 116 | if (!pci_to_OF_bus_map) { |
| 117 | printk(KERN_ERR "Can't allocate OF bus map !\n"); |
| 118 | return; |
| 119 | } |
| 120 | |
| 121 | /* We fill the bus map with invalid values, that helps |
| 122 | * debugging. |
| 123 | */ |
| 124 | for (i=0; i<pci_bus_count; i++) |
| 125 | pci_to_OF_bus_map[i] = 0xff; |
| 126 | |
| 127 | /* For each hose, we begin searching bridges */ |
| 128 | list_for_each_entry_safe(hose, tmp, &hose_list, list_node) { |
| 129 | struct device_node* node = hose->dn; |
| 130 | |
| 131 | if (!node) |
| 132 | continue; |
| 133 | make_one_node_map(node, hose->first_busno); |
| 134 | } |
| 135 | dn = of_find_node_by_path("/"); |
| 136 | map_prop = of_find_property(dn, "pci-OF-bus-map", NULL); |
| 137 | if (map_prop) { |
| 138 | BUG_ON(pci_bus_count > map_prop->length); |
| 139 | memcpy(map_prop->value, pci_to_OF_bus_map, pci_bus_count); |
| 140 | } |
| 141 | of_node_put(dn); |
| 142 | #ifdef DEBUG |
| 143 | printk("PCI->OF bus map:\n"); |
| 144 | for (i=0; i<pci_bus_count; i++) { |
| 145 | if (pci_to_OF_bus_map[i] == 0xff) |
| 146 | continue; |
| 147 | printk("%d -> %d\n", i, pci_to_OF_bus_map[i]); |
| 148 | } |
| 149 | #endif |
| 150 | } |
| 151 | |
| 152 | |
| 153 | /* |
| 154 | * Returns the PCI device matching a given OF node |
| 155 | */ |
| 156 | int pci_device_from_OF_node(struct device_node *node, u8 *bus, u8 *devfn) |
| 157 | { |
| 158 | struct pci_dev *dev = NULL; |
| 159 | const __be32 *reg; |
| 160 | int size; |
| 161 | |
| 162 | /* Check if it might have a chance to be a PCI device */ |
| 163 | if (!pci_find_hose_for_OF_device(node)) |
| 164 | return -ENODEV; |
| 165 | |
| 166 | reg = of_get_property(node, "reg", &size); |
| 167 | if (!reg || size < 5 * sizeof(u32)) |
| 168 | return -ENODEV; |
| 169 | |
| 170 | *bus = (be32_to_cpup(®[0]) >> 16) & 0xff; |
| 171 | *devfn = (be32_to_cpup(®[0]) >> 8) & 0xff; |
| 172 | |
| 173 | /* Ok, here we need some tweak. If we have already renumbered |
| 174 | * all busses, we can't rely on the OF bus number any more. |
| 175 | * the pci_to_OF_bus_map is not enough as several PCI busses |
| 176 | * may match the same OF bus number. |
| 177 | */ |
| 178 | if (!pci_to_OF_bus_map) |
| 179 | return 0; |
| 180 | |
| 181 | for_each_pci_dev(dev) |
| 182 | if (pci_to_OF_bus_map[dev->bus->number] == *bus && |
| 183 | dev->devfn == *devfn) { |
| 184 | *bus = dev->bus->number; |
| 185 | pci_dev_put(dev); |
| 186 | return 0; |
| 187 | } |
| 188 | |
| 189 | return -ENODEV; |
| 190 | } |
| 191 | EXPORT_SYMBOL(pci_device_from_OF_node); |
| 192 | |
| 193 | /* We create the "pci-OF-bus-map" property now so it appears in the |
| 194 | * /proc device tree |
| 195 | */ |
| 196 | void __init |
| 197 | pci_create_OF_bus_map(void) |
| 198 | { |
| 199 | struct property* of_prop; |
| 200 | struct device_node *dn; |
| 201 | |
| 202 | of_prop = (struct property*) alloc_bootmem(sizeof(struct property) + 256); |
| 203 | if (!of_prop) |
| 204 | return; |
| 205 | dn = of_find_node_by_path("/"); |
| 206 | if (dn) { |
| 207 | memset(of_prop, -1, sizeof(struct property) + 256); |
| 208 | of_prop->name = "pci-OF-bus-map"; |
| 209 | of_prop->length = 256; |
| 210 | of_prop->value = &of_prop[1]; |
| 211 | of_add_property(dn, of_prop); |
| 212 | of_node_put(dn); |
| 213 | } |
| 214 | } |
| 215 | |
| 216 | void pcibios_setup_phb_io_space(struct pci_controller *hose) |
| 217 | { |
| 218 | unsigned long io_offset; |
| 219 | struct resource *res = &hose->io_resource; |
| 220 | |
| 221 | /* Fixup IO space offset */ |
| 222 | io_offset = pcibios_io_space_offset(hose); |
| 223 | res->start += io_offset; |
| 224 | res->end += io_offset; |
| 225 | } |
| 226 | |
| 227 | static int __init pcibios_init(void) |
| 228 | { |
| 229 | struct pci_controller *hose, *tmp; |
| 230 | int next_busno = 0; |
| 231 | |
| 232 | printk(KERN_INFO "PCI: Probing PCI hardware\n"); |
| 233 | |
| 234 | if (pci_has_flag(PCI_REASSIGN_ALL_BUS)) |
| 235 | pci_assign_all_buses = 1; |
| 236 | |
| 237 | /* Scan all of the recorded PCI controllers. */ |
| 238 | list_for_each_entry_safe(hose, tmp, &hose_list, list_node) { |
| 239 | if (pci_assign_all_buses) |
| 240 | hose->first_busno = next_busno; |
| 241 | hose->last_busno = 0xff; |
| 242 | pcibios_scan_phb(hose); |
| 243 | pci_bus_add_devices(hose->bus); |
| 244 | if (pci_assign_all_buses || next_busno <= hose->last_busno) |
| 245 | next_busno = hose->last_busno + pcibios_assign_bus_offset; |
| 246 | } |
| 247 | pci_bus_count = next_busno; |
| 248 | |
| 249 | /* OpenFirmware based machines need a map of OF bus |
| 250 | * numbers vs. kernel bus numbers since we may have to |
| 251 | * remap them. |
| 252 | */ |
| 253 | if (pci_assign_all_buses) |
| 254 | pcibios_make_OF_bus_map(); |
| 255 | |
| 256 | /* Call common code to handle resource allocation */ |
| 257 | pcibios_resource_survey(); |
| 258 | |
| 259 | /* Call machine dependent post-init code */ |
| 260 | if (ppc_md.pcibios_after_init) |
| 261 | ppc_md.pcibios_after_init(); |
| 262 | |
| 263 | return 0; |
| 264 | } |
| 265 | |
| 266 | subsys_initcall(pcibios_init); |
| 267 | |
| 268 | static struct pci_controller* |
| 269 | pci_bus_to_hose(int bus) |
| 270 | { |
| 271 | struct pci_controller *hose, *tmp; |
| 272 | |
| 273 | list_for_each_entry_safe(hose, tmp, &hose_list, list_node) |
| 274 | if (bus >= hose->first_busno && bus <= hose->last_busno) |
| 275 | return hose; |
| 276 | return NULL; |
| 277 | } |
| 278 | |
| 279 | /* Provide information on locations of various I/O regions in physical |
| 280 | * memory. Do this on a per-card basis so that we choose the right |
| 281 | * root bridge. |
| 282 | * Note that the returned IO or memory base is a physical address |
| 283 | */ |
| 284 | |
| 285 | long sys_pciconfig_iobase(long which, unsigned long bus, unsigned long devfn) |
| 286 | { |
| 287 | struct pci_controller* hose; |
| 288 | long result = -EOPNOTSUPP; |
| 289 | |
| 290 | hose = pci_bus_to_hose(bus); |
| 291 | if (!hose) |
| 292 | return -ENODEV; |
| 293 | |
| 294 | switch (which) { |
| 295 | case IOBASE_BRIDGE_NUMBER: |
| 296 | return (long)hose->first_busno; |
| 297 | case IOBASE_MEMORY: |
| 298 | return (long)hose->mem_offset[0]; |
| 299 | case IOBASE_IO: |
| 300 | return (long)hose->io_base_phys; |
| 301 | case IOBASE_ISA_IO: |
| 302 | return (long)isa_io_base; |
| 303 | case IOBASE_ISA_MEM: |
| 304 | return (long)isa_mem_base; |
| 305 | } |
| 306 | |
| 307 | return result; |
| 308 | } |
| 309 | |
| 310 | |