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
  19 #include <asm/processor.h>
  20 #include <asm/io.h>
  21 #include <asm/prom.h>
  22 #include <asm/sections.h>
  23 #include <asm/pci-bridge.h>
  24 #include <asm/ppc-pci.h>
  25 #include <asm/byteorder.h>
  26 #include <asm/uaccess.h>
  27 #include <asm/machdep.h>
  28
  29 #undef DEBUG
  30
  31 unsigned long isa_io_base     = 0;
  32 unsigned long pci_dram_offset = 0;
  33 int pcibios_assign_bus_offset = 1;
  34
  35 void pcibios_make_OF_bus_map(void);
  36
  37 static void fixup_cpc710_pci64(struct pci_dev* dev);
  38 static u8* pci_to_OF_bus_map;
  39
  40 /* By default, we don't re-assign bus numbers. We do this only on
  41  * some pmacs
  42  */
  43 static int pci_assign_all_buses;
  44
  45 static int pci_bus_count;
  46
  47 /* This will remain NULL for now, until isa-bridge.c is made common
  48  * to both 32-bit and 64-bit.
  49  */
  50 struct pci_dev *isa_bridge_pcidev;
  51 EXPORT_SYMBOL_GPL(isa_bridge_pcidev);
  52
  53 static void
  54 fixup_cpc710_pci64(struct pci_dev* dev)
  55 {
  56         /* Hide the PCI64 BARs from the kernel as their content doesn't
  57          * fit well in the resource management
  58          */
  59         dev->resource[0].start = dev->resource[0].end = 0;
  60         dev->resource[0].flags = 0;
  61         dev->resource[1].start = dev->resource[1].end = 0;
  62         dev->resource[1].flags = 0;
  63 }
  64 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_IBM,     PCI_DEVICE_ID_IBM_CPC710_PCI64, fixup_cpc710_pci64);
  65
  66 /*
  67  * Functions below are used on OpenFirmware machines.
  68  */
  69 static void
  70 make_one_node_map(struct device_node* node, u8 pci_bus)
  71 {
  72         const int *bus_range;
  73         int len;
  74
  75         if (pci_bus >= pci_bus_count)
  76                 return;
  77         bus_range = of_get_property(node, "bus-range", &len);
  78         if (bus_range == NULL || len < 2 * sizeof(int)) {
  79                 printk(KERN_WARNING "Can't get bus-range for %s, "
  80                        "assuming it starts at 0\n", node->full_name);
  81                 pci_to_OF_bus_map[pci_bus] = 0;
  82         } else
  83                 pci_to_OF_bus_map[pci_bus] = bus_range[0];
  84
  85         for_each_child_of_node(node, node) {
  86                 struct pci_dev* dev;
  87                 const unsigned int *class_code, *reg;
  88
  89                 class_code = of_get_property(node, "class-code", NULL);
  90                 if (!class_code || ((*class_code >> 8) != PCI_CLASS_BRIDGE_PCI &&
  91                         (*class_code >> 8) != PCI_CLASS_BRIDGE_CARDBUS))
  92                         continue;
  93                 reg = of_get_property(node, "reg", NULL);
  94                 if (!reg)
  95                         continue;
  96                 dev = pci_get_bus_and_slot(pci_bus, ((reg[0] >> 8) & 0xff));
  97                 if (!dev || !dev->subordinate) {
  98                         pci_dev_put(dev);
  99                         continue;
 100                 }
 101                 make_one_node_map(node, dev->subordinate->number);
 102                 pci_dev_put(dev);
 103         }
 104 }
 105
 106 void
 107 pcibios_make_OF_bus_map(void)
 108 {
 109         int i;
 110         struct pci_controller *hose, *tmp;
 111         struct property *map_prop;
 112         struct device_node *dn;
 113
 114         pci_to_OF_bus_map = kmalloc(pci_bus_count, GFP_KERNEL);
 115         if (!pci_to_OF_bus_map) {
 116                 printk(KERN_ERR "Can't allocate OF bus map !\n");
 117                 return;
 118         }
 119
 120         /* We fill the bus map with invalid values, that helps
 121          * debugging.
 122          */
 123         for (i=0; i<pci_bus_count; i++)
 124                 pci_to_OF_bus_map[i] = 0xff;
 125
 126         /* For each hose, we begin searching bridges */
 127         list_for_each_entry_safe(hose, tmp, &hose_list, list_node) {
 128                 struct device_node* node = hose->dn;
 129
 130                 if (!node)
 131                         continue;
 132                 make_one_node_map(node, hose->first_busno);
 133         }
 134         dn = of_find_node_by_path("/");
 135         map_prop = of_find_property(dn, "pci-OF-bus-map", NULL);
 136         if (map_prop) {
 137                 BUG_ON(pci_bus_count > map_prop->length);
 138                 memcpy(map_prop->value, pci_to_OF_bus_map, pci_bus_count);
 139         }
 140         of_node_put(dn);
 141 #ifdef DEBUG
 142         printk("PCI->OF bus map:\n");
 143         for (i=0; i<pci_bus_count; i++) {
 144                 if (pci_to_OF_bus_map[i] == 0xff)
 145                         continue;
 146                 printk("%d -> %d\n", i, pci_to_OF_bus_map[i]);
 147         }
 148 #endif
 149 }
 150
 151
 152 /*
 153  * Returns the PCI device matching a given OF node
 154  */
 155 int pci_device_from_OF_node(struct device_node *node, u8 *bus, u8 *devfn)
 156 {
 157         struct pci_dev *dev = NULL;
 158         const __be32 *reg;
 159         int size;
 160
 161         /* Check if it might have a chance to be a PCI device */
 162         if (!pci_find_hose_for_OF_device(node))
 163                 return -ENODEV;
 164
 165         reg = of_get_property(node, "reg", &size);
 166         if (!reg || size < 5 * sizeof(u32))
 167                 return -ENODEV;
 168
 169         *bus = (be32_to_cpup(&reg[0]) >> 16) & 0xff;
 170         *devfn = (be32_to_cpup(&reg[0]) >> 8) & 0xff;
 171
 172         /* Ok, here we need some tweak. If we have already renumbered
 173          * all busses, we can't rely on the OF bus number any more.
 174          * the pci_to_OF_bus_map is not enough as several PCI busses
 175          * may match the same OF bus number.
 176          */
 177         if (!pci_to_OF_bus_map)
 178                 return 0;
 179
 180         for_each_pci_dev(dev)
 181                 if (pci_to_OF_bus_map[dev->bus->number] == *bus &&
 182                                 dev->devfn == *devfn) {
 183                         *bus = dev->bus->number;
 184                         pci_dev_put(dev);
 185                         return 0;
 186                 }
 187
 188         return -ENODEV;
 189 }
 190 EXPORT_SYMBOL(pci_device_from_OF_node);
 191
 192 /* We create the "pci-OF-bus-map" property now so it appears in the
 193  * /proc device tree
 194  */
 195 void __init
 196 pci_create_OF_bus_map(void)
 197 {
 198         struct property* of_prop;
 199         struct device_node *dn;
 200
 201         of_prop = (struct property*) alloc_bootmem(sizeof(struct property) + 256);
 202         if (!of_prop)
 203                 return;
 204         dn = of_find_node_by_path("/");
 205         if (dn) {
 206                 memset(of_prop, -1, sizeof(struct property) + 256);
 207                 of_prop->name = "pci-OF-bus-map";
 208                 of_prop->length = 256;
 209                 of_prop->value = &of_prop[1];
 210                 prom_add_property(dn, of_prop);
 211                 of_node_put(dn);
 212         }
 213 }
 214
 215 void __devinit pcibios_setup_phb_io_space(struct pci_controller *hose)
 216 {
 217         unsigned long io_offset;
 218         struct resource *res = &hose->io_resource;
 219
 220         /* Fixup IO space offset */
 221         io_offset = (unsigned long)hose->io_base_virt - isa_io_base;
 222         res->start = (res->start + io_offset) & 0xffffffffu;
 223         res->end = (res->end + io_offset) & 0xffffffffu;
 224 }
 225
 226 static int __init pcibios_init(void)
 227 {
 228         struct pci_controller *hose, *tmp;
 229         int next_busno = 0;
 230
 231         printk(KERN_INFO "PCI: Probing PCI hardware\n");
 232
 233         if (pci_has_flag(PCI_REASSIGN_ALL_BUS))
 234                 pci_assign_all_buses = 1;
 235
 236         /* Scan all of the recorded PCI controllers.  */
 237         list_for_each_entry_safe(hose, tmp, &hose_list, list_node) {
 238                 if (pci_assign_all_buses)
 239                         hose->first_busno = next_busno;
 240                 hose->last_busno = 0xff;
 241                 pcibios_scan_phb(hose);
 242                 pci_bus_add_devices(hose->bus);
 243                 if (pci_assign_all_buses || next_busno <= hose->last_busno)
 244                         next_busno = hose->last_busno + pcibios_assign_bus_offset;
 245         }
 246         pci_bus_count = next_busno;
 247
 248         /* OpenFirmware based machines need a map of OF bus
 249          * numbers vs. kernel bus numbers since we may have to
 250          * remap them.
 251          */
 252         if (pci_assign_all_buses)
 253                 pcibios_make_OF_bus_map();
 254
 255         /* Call common code to handle resource allocation */
 256         pcibios_resource_survey();
 257
 258         /* Call machine dependent post-init code */
 259         if (ppc_md.pcibios_after_init)
 260                 ppc_md.pcibios_after_init();
 261
 262         return 0;
 263 }
 264
 265 subsys_initcall(pcibios_init);
 266
 267 static struct pci_controller*
 268 pci_bus_to_hose(int bus)
 269 {
 270         struct pci_controller *hose, *tmp;
 271
 272         list_for_each_entry_safe(hose, tmp, &hose_list, list_node)
 273                 if (bus >= hose->first_busno && bus <= hose->last_busno)
 274                         return hose;
 275         return NULL;
 276 }
 277
 278 /* Provide information on locations of various I/O regions in physical
 279  * memory.  Do this on a per-card basis so that we choose the right
 280  * root bridge.
 281  * Note that the returned IO or memory base is a physical address
 282  */
 283
 284 long sys_pciconfig_iobase(long which, unsigned long bus, unsigned long devfn)
 285 {
 286         struct pci_controller* hose;
 287         long result = -EOPNOTSUPP;
 288
 289         hose = pci_bus_to_hose(bus);
 290         if (!hose)
 291                 return -ENODEV;
 292
 293         switch (which) {
 294         case IOBASE_BRIDGE_NUMBER:
 295                 return (long)hose->first_busno;
 296         case IOBASE_MEMORY:
 297                 return (long)hose->pci_mem_offset;
 298         case IOBASE_IO:
 299                 return (long)hose->io_base_phys;
 300         case IOBASE_ISA_IO:
 301                 return (long)isa_io_base;
 302         case IOBASE_ISA_MEM:
 303                 return (long)isa_mem_base;
 304         }
 305
 306         return result;
 307 }
 308
 309