linux/arch/powerpc/kernel/pci_32.c
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   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
  32unsigned long isa_io_base     = 0;
  33unsigned long pci_dram_offset = 0;
  34int pcibios_assign_bus_offset = 1;
  35EXPORT_SYMBOL(isa_io_base);
  36EXPORT_SYMBOL(pci_dram_offset);
  37
  38void pcibios_make_OF_bus_map(void);
  39
  40static void fixup_cpc710_pci64(struct pci_dev* dev);
  41static 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 */
  46static int pci_assign_all_buses;
  47
  48static 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 */
  53struct pci_dev *isa_bridge_pcidev;
  54EXPORT_SYMBOL_GPL(isa_bridge_pcidev);
  55
  56static void
  57fixup_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}
  67DECLARE_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 */
  72static void
  73make_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        
 109void
 110pcibios_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 */
 158int 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}
 193EXPORT_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 */
 198void __init
 199pci_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
 216void 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
 227static 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
 266subsys_initcall(pcibios_init);
 267
 268static struct pci_controller*
 269pci_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
 285long 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
 311