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 %s, "
  83                        "assuming it starts at 0\n", node->full_name);
  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_bus_and_slot(pci_bus, ((reg[0] >> 8) & 0xff));
 100                 if (!dev || !dev->subordinate) {
 101                         pci_dev_put(dev);
 102                         continue;
 103                 }
 104                 make_one_node_map(node, dev->subordinate->number);
 105                 pci_dev_put(dev);
 106         }
 107 }
 108
 109 void
 110 pcibios_make_OF_bus_map(void)
 111 {
 112         int i;
 113         struct pci_controller *hose, *tmp;
 114         struct property *map_prop;
 115         struct device_node *dn;
 116
 117         pci_to_OF_bus_map = kmalloc(pci_bus_count, GFP_KERNEL);
 118         if (!pci_to_OF_bus_map) {
 119                 printk(KERN_ERR "Can't allocate OF bus map !\n");
 120                 return;
 121         }
 122
 123         /* We fill the bus map with invalid values, that helps
 124          * debugging.
 125          */
 126         for (i=0; i<pci_bus_count; i++)
 127                 pci_to_OF_bus_map[i] = 0xff;
 128
 129         /* For each hose, we begin searching bridges */
 130         list_for_each_entry_safe(hose, tmp, &hose_list, list_node) {
 131                 struct device_node* node = hose->dn;
 132
 133                 if (!node)
 134                         continue;
 135                 make_one_node_map(node, hose->first_busno);
 136         }
 137         dn = of_find_node_by_path("/");
 138         map_prop = of_find_property(dn, "pci-OF-bus-map", NULL);
 139         if (map_prop) {
 140                 BUG_ON(pci_bus_count > map_prop->length);
 141                 memcpy(map_prop->value, pci_to_OF_bus_map, pci_bus_count);
 142         }
 143         of_node_put(dn);
 144 #ifdef DEBUG
 145         printk("PCI->OF bus map:\n");
 146         for (i=0; i<pci_bus_count; i++) {
 147                 if (pci_to_OF_bus_map[i] == 0xff)
 148                         continue;
 149                 printk("%d -> %d\n", i, pci_to_OF_bus_map[i]);
 150         }
 151 #endif
 152 }
 153
 154
 155 /*
 156  * Returns the PCI device matching a given OF node
 157  */
 158 int pci_device_from_OF_node(struct device_node *node, u8 *bus, u8 *devfn)
 159 {
 160         struct pci_dev *dev = NULL;
 161         const __be32 *reg;
 162         int size;
 163
 164         /* Check if it might have a chance to be a PCI device */
 165         if (!pci_find_hose_for_OF_device(node))
 166                 return -ENODEV;
 167
 168         reg = of_get_property(node, "reg", &size);
 169         if (!reg || size < 5 * sizeof(u32))
 170                 return -ENODEV;
 171
 172         *bus = (be32_to_cpup(&reg[0]) >> 16) & 0xff;
 173         *devfn = (be32_to_cpup(&reg[0]) >> 8) & 0xff;
 174
 175         /* Ok, here we need some tweak. If we have already renumbered
 176          * all busses, we can't rely on the OF bus number any more.
 177          * the pci_to_OF_bus_map is not enough as several PCI busses
 178          * may match the same OF bus number.
 179          */
 180         if (!pci_to_OF_bus_map)
 181                 return 0;
 182
 183         for_each_pci_dev(dev)
 184                 if (pci_to_OF_bus_map[dev->bus->number] == *bus &&
 185                                 dev->devfn == *devfn) {
 186                         *bus = dev->bus->number;
 187                         pci_dev_put(dev);
 188                         return 0;
 189                 }
 190
 191         return -ENODEV;
 192 }
 193 EXPORT_SYMBOL(pci_device_from_OF_node);
 194
 195 /* We create the "pci-OF-bus-map" property now so it appears in the
 196  * /proc device tree
 197  */
 198 void __init
 199 pci_create_OF_bus_map(void)
 200 {
 201         struct property* of_prop;
 202         struct device_node *dn;
 203
 204         of_prop = memblock_virt_alloc(sizeof(struct property) + 256, 0);
 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