arch/powerpc/kernel/pci_32.c

   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 <linux/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 EXPORT_SYMBOL(isa_io_base);
  36 EXPORT_SYMBOL(pci_dram_offset);
  37
  38 void pcibios_make_OF_bus_map(void);
  39
  40 static void fixup_cpc710_pci64(struct pci_dev* dev);
  41 static u8* pci_to_OF_bus_map;
  42
  43 /* By default, we don't re-assign bus numbers. We do this only on
  44  * some pmacs
  45  */
  46 static int pci_assign_all_buses;
  47
  48 static int pci_bus_count;
  49
  50 /* This will remain NULL for now, until isa-bridge.c is made common
  51  * to both 32-bit and 64-bit.
  52  */
  53 struct pci_dev *isa_bridge_pcidev;
  54 EXPORT_SYMBOL_GPL(isa_bridge_pcidev);
  55
  56 static void
  57 fixup_cpc710_pci64(struct pci_dev* dev)
  58 {
  59         /* Hide the PCI64 BARs from the kernel as their content doesn't
  60          * fit well in the resource management
  61          */
  62         dev->resource[0].start = dev->resource[0].end = 0;
  63         dev->resource[0].flags = 0;
  64         dev->resource[1].start = dev->resource[1].end = 0;
  65         dev->resource[1].flags = 0;
  66 }
  67 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_IBM,     PCI_DEVICE_ID_IBM_CPC710_PCI64, fixup_cpc710_pci64);
  68
  69 /*
  70  * Functions below are used on OpenFirmware machines.
  71  */
  72 static void
  73 make_one_node_map(struct device_node* node, u8 pci_bus)
  74 {
  75         const int *bus_range;
  76         int len;
  77
  78         if (pci_bus >= pci_bus_count)
  79                 return;
  80         bus_range = of_get_property(node, "bus-range", &len);
  81         if (bus_range == NULL || len < 2 * sizeof(int)) {
  82                 printk(KERN_WARNING "Can't get bus-range for %pOF, "
  83                        "assuming it starts at 0\n", node);
  84                 pci_to_OF_bus_map[pci_bus] = 0;
  85         } else
  86                 pci_to_OF_bus_map[pci_bus] = bus_range[0];
  87
  88         for_each_child_of_node(node, node) {
  89                 struct pci_dev* dev;
  90                 const unsigned int *class_code, *reg;
  91
  92                 class_code = of_get_property(node, "class-code", NULL);
  93                 if (!class_code || ((*class_code >> 8) != PCI_CLASS_BRIDGE_PCI &&
  94                         (*class_code >> 8) != PCI_CLASS_BRIDGE_CARDBUS))
  95                         continue;
  96                 reg = of_get_property(node, "reg", NULL);
  97                 if (!reg)
  98                         continue;
  99                 dev = pci_get_domain_bus_and_slot(0, pci_bus,
 100                                                   ((reg[0] >> 8) & 0xff));
 101                 if (!dev || !dev->subordinate) {
 102                         pci_dev_put(dev);
 103                         continue;
 104                 }
 105                 make_one_node_map(node, dev->subordinate->number);
 106                 pci_dev_put(dev);
 107         }
 108 }
 109
 110 void
 111 pcibios_make_OF_bus_map(void)
 112 {
 113         int i;
 114         struct pci_controller *hose, *tmp;
 115         struct property *map_prop;
 116         struct device_node *dn;
 117
 118         pci_to_OF_bus_map = kmalloc(pci_bus_count, GFP_KERNEL);
 119         if (!pci_to_OF_bus_map) {
 120                 printk(KERN_ERR "Can't allocate OF bus map !\n");
 121                 return;
 122         }
 123
 124         /* We fill the bus map with invalid values, that helps
 125          * debugging.
 126          */
 127         for (i=0; i<pci_bus_count; i++)
 128                 pci_to_OF_bus_map[i] = 0xff;
 129
 130         /* For each hose, we begin searching bridges */
 131         list_for_each_entry_safe(hose, tmp, &hose_list, list_node) {
 132                 struct device_node* node = hose->dn;
 133
 134                 if (!node)
 135                         continue;
 136                 make_one_node_map(node, hose->first_busno);
 137         }
 138         dn = of_find_node_by_path("/");
 139         map_prop = of_find_property(dn, "pci-OF-bus-map", NULL);
 140         if (map_prop) {
 141                 BUG_ON(pci_bus_count > map_prop->length);
 142                 memcpy(map_prop->value, pci_to_OF_bus_map, pci_bus_count);
 143         }
 144         of_node_put(dn);
 145 #ifdef DEBUG
 146         printk("PCI->OF bus map:\n");
 147         for (i=0; i<pci_bus_count; i++) {
 148                 if (pci_to_OF_bus_map[i] == 0xff)
 149                         continue;
 150                 printk("%d -> %d\n", i, pci_to_OF_bus_map[i]);
 151         }
 152 #endif
 153 }
 154
 155
 156 /*
 157  * Returns the PCI device matching a given OF node
 158  */
 159 int pci_device_from_OF_node(struct device_node *node, u8 *bus, u8 *devfn)
 160 {
 161         struct pci_dev *dev = NULL;
 162         const __be32 *reg;
 163         int size;
 164
 165         /* Check if it might have a chance to be a PCI device */
 166         if (!pci_find_hose_for_OF_device(node))
 167                 return -ENODEV;
 168
 169         reg = of_get_property(node, "reg", &size);
 170         if (!reg || size < 5 * sizeof(u32))
 171                 return -ENODEV;
 172
 173         *bus = (be32_to_cpup(&reg[0]) >> 16) & 0xff;
 174         *devfn = (be32_to_cpup(&reg[0]) >> 8) & 0xff;
 175
 176         /* Ok, here we need some tweak. If we have already renumbered
 177          * all busses, we can't rely on the OF bus number any more.
 178          * the pci_to_OF_bus_map is not enough as several PCI busses
 179          * may match the same OF bus number.
 180          */
 181         if (!pci_to_OF_bus_map)
 182                 return 0;
 183
 184         for_each_pci_dev(dev)
 185                 if (pci_to_OF_bus_map[dev->bus->number] == *bus &&
 186                                 dev->devfn == *devfn) {
 187                         *bus = dev->bus->number;
 188                         pci_dev_put(dev);
 189                         return 0;
 190                 }
 191
 192         return -ENODEV;
 193 }
 194 EXPORT_SYMBOL(pci_device_from_OF_node);
 195
 196 /* We create the "pci-OF-bus-map" property now so it appears in the
 197  * /proc device tree
 198  */
 199 void __init
 200 pci_create_OF_bus_map(void)
 201 {
 202         struct property* of_prop;
 203         struct device_node *dn;
 204
 205         of_prop = memblock_virt_alloc(sizeof(struct property) + 256, 0);
 206         dn = of_find_node_by_path("/");
 207         if (dn) {
 208                 memset(of_prop, -1, sizeof(struct property) + 256);
 209                 of_prop->name = "pci-OF-bus-map";
 210                 of_prop->length = 256;
 211                 of_prop->value = &of_prop[1];
 212                 of_add_property(dn, of_prop);
 213                 of_node_put(dn);
 214         }
 215 }
 216
 217 void pcibios_setup_phb_io_space(struct pci_controller *hose)
 218 {
 219         unsigned long io_offset;
 220         struct resource *res = &hose->io_resource;
 221
 222         /* Fixup IO space offset */
 223         io_offset = pcibios_io_space_offset(hose);
 224         res->start += io_offset;
 225         res->end += io_offset;
 226 }
 227
 228 static int __init pcibios_init(void)
 229 {
 230         struct pci_controller *hose, *tmp;
 231         int next_busno = 0;
 232
 233         printk(KERN_INFO "PCI: Probing PCI hardware\n");
 234
 235         if (pci_has_flag(PCI_REASSIGN_ALL_BUS))
 236                 pci_assign_all_buses = 1;
 237
 238         /* Scan all of the recorded PCI controllers.  */
 239         list_for_each_entry_safe(hose, tmp, &hose_list, list_node) {
 240                 if (pci_assign_all_buses)
 241                         hose->first_busno = next_busno;
 242                 hose->last_busno = 0xff;
 243                 pcibios_scan_phb(hose);
 244                 pci_bus_add_devices(hose->bus);
 245                 if (pci_assign_all_buses || next_busno <= hose->last_busno)
 246                         next_busno = hose->last_busno + pcibios_assign_bus_offset;
 247         }
 248         pci_bus_count = next_busno;
 249
 250         /* OpenFirmware based machines need a map of OF bus
 251          * numbers vs. kernel bus numbers since we may have to
 252          * remap them.
 253          */
 254         if (pci_assign_all_buses)
 255                 pcibios_make_OF_bus_map();
 256
 257         /* Call common code to handle resource allocation */
 258         pcibios_resource_survey();
 259
 260         /* Call machine dependent post-init code */
 261         if (ppc_md.pcibios_after_init)
 262                 ppc_md.pcibios_after_init();
 263
 264         return 0;
 265 }
 266
 267 subsys_initcall(pcibios_init);
 268
 269 static struct pci_controller*
 270 pci_bus_to_hose(int bus)
 271 {
 272         struct pci_controller *hose, *tmp;
 273
 274         list_for_each_entry_safe(hose, tmp, &hose_list, list_node)
 275                 if (bus >= hose->first_busno && bus <= hose->last_busno)
 276                         return hose;
 277         return NULL;
 278 }
 279
 280 /* Provide information on locations of various I/O regions in physical
 281  * memory.  Do this on a per-card basis so that we choose the right
 282  * root bridge.
 283  * Note that the returned IO or memory base is a physical address
 284  */
 285
 286 long sys_pciconfig_iobase(long which, unsigned long bus, unsigned long devfn)
 287 {
 288         struct pci_controller* hose;
 289         long result = -EOPNOTSUPP;
 290
 291         hose = pci_bus_to_hose(bus);
 292         if (!hose)
 293                 return -ENODEV;
 294
 295         switch (which) {
 296         case IOBASE_BRIDGE_NUMBER:
 297                 return (long)hose->first_busno;
 298         case IOBASE_MEMORY:
 299                 return (long)hose->mem_offset[0];
 300         case IOBASE_IO:
 301                 return (long)hose->io_base_phys;
 302         case IOBASE_ISA_IO:
 303                 return (long)isa_io_base;
 304         case IOBASE_ISA_MEM:
 305                 return (long)isa_mem_base;
 306         }
 307
 308         return result;
 309 }
 310
 311