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 <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(&reg[0]) >> 16) & 0xff;
 171         *devfn = (be32_to_cpup(&reg[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                 prom_add_property(dn, of_prop);
 212                 of_node_put(dn);
 213         }
 214 }
 215
 216 void __devinit 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->pci_mem_offset;
 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