arch/powerpc/kernel/pci_64.c

   1 /*
   2  * Port for PPC64 David Engebretsen, IBM Corp.
   3  * Contains common pci routines for ppc64 platform, pSeries and iSeries brands.
   4  *
   5  * Copyright (C) 2003 Anton Blanchard <anton@au.ibm.com>, IBM
   6  *   Rework, based on alpha PCI code.
   7  *
   8  *      This program is free software; you can redistribute it and/or
   9  *      modify it under the terms of the GNU General Public License
  10  *      as published by the Free Software Foundation; either version
  11  *      2 of the License, or (at your option) any later version.
  12  */
  13
  14 #undef DEBUG
  15
  16 #include <linux/kernel.h>
  17 #include <linux/pci.h>
  18 #include <linux/string.h>
  19 #include <linux/init.h>
  20 #include <linux/bootmem.h>
  21 #include <linux/export.h>
  22 #include <linux/mm.h>
  23 #include <linux/list.h>
  24 #include <linux/syscalls.h>
  25 #include <linux/irq.h>
  26 #include <linux/vmalloc.h>
  27
  28 #include <asm/processor.h>
  29 #include <asm/io.h>
  30 #include <asm/prom.h>
  31 #include <asm/pci-bridge.h>
  32 #include <asm/byteorder.h>
  33 #include <asm/machdep.h>
  34 #include <asm/ppc-pci.h>
  35
  36 /* pci_io_base -- the base address from which io bars are offsets.
  37  * This is the lowest I/O base address (so bar values are always positive),
  38  * and it *must* be the start of ISA space if an ISA bus exists because
  39  * ISA drivers use hard coded offsets.  If no ISA bus exists nothing
  40  * is mapped on the first 64K of IO space
  41  */
  42 unsigned long pci_io_base = ISA_IO_BASE;
  43 EXPORT_SYMBOL(pci_io_base);
  44
  45 static int __init pcibios_init(void)
  46 {
  47         struct pci_controller *hose, *tmp;
  48
  49         printk(KERN_INFO "PCI: Probing PCI hardware\n");
  50
  51         /* For now, override phys_mem_access_prot. If we need it,g
  52          * later, we may move that initialization to each ppc_md
  53          */
  54         ppc_md.phys_mem_access_prot = pci_phys_mem_access_prot;
  55
  56         /* On ppc64, we always enable PCI domains and we keep domain 0
  57          * backward compatible in /proc for video cards
  58          */
  59         pci_add_flags(PCI_ENABLE_PROC_DOMAINS | PCI_COMPAT_DOMAIN_0);
  60
  61         /* Scan all of the recorded PCI controllers.  */
  62         list_for_each_entry_safe(hose, tmp, &hose_list, list_node) {
  63                 pcibios_scan_phb(hose);
  64                 pci_bus_add_devices(hose->bus);
  65         }
  66
  67         /* Call common code to handle resource allocation */
  68         pcibios_resource_survey();
  69
  70         printk(KERN_DEBUG "PCI: Probing PCI hardware done\n");
  71
  72         return 0;
  73 }
  74
  75 subsys_initcall(pcibios_init);
  76
  77 int pcibios_unmap_io_space(struct pci_bus *bus)
  78 {
  79         struct pci_controller *hose;
  80
  81         WARN_ON(bus == NULL);
  82
  83         /* If this is not a PHB, we only flush the hash table over
  84          * the area mapped by this bridge. We don't play with the PTE
  85          * mappings since we might have to deal with sub-page alignemnts
  86          * so flushing the hash table is the only sane way to make sure
  87          * that no hash entries are covering that removed bridge area
  88          * while still allowing other busses overlapping those pages
  89          *
  90          * Note: If we ever support P2P hotplug on Book3E, we'll have
  91          * to do an appropriate TLB flush here too
  92          */
  93         if (bus->self) {
  94 #ifdef CONFIG_PPC_STD_MMU_64
  95                 struct resource *res = bus->resource[0];
  96 #endif
  97
  98                 pr_debug("IO unmapping for PCI-PCI bridge %s\n",
  99                          pci_name(bus->self));
 100
 101 #ifdef CONFIG_PPC_STD_MMU_64
 102                 __flush_hash_table_range(&init_mm, res->start + _IO_BASE,
 103                                          res->end + _IO_BASE + 1);
 104 #endif
 105                 return 0;
 106         }
 107
 108         /* Get the host bridge */
 109         hose = pci_bus_to_host(bus);
 110
 111         /* Check if we have IOs allocated */
 112         if (hose->io_base_alloc == 0)
 113                 return 0;
 114
 115         pr_debug("IO unmapping for PHB %s\n", hose->dn->full_name);
 116         pr_debug("  alloc=0x%p\n", hose->io_base_alloc);
 117
 118         /* This is a PHB, we fully unmap the IO area */
 119         vunmap(hose->io_base_alloc);
 120
 121         return 0;
 122 }
 123 EXPORT_SYMBOL_GPL(pcibios_unmap_io_space);
 124
 125 static int pcibios_map_phb_io_space(struct pci_controller *hose)
 126 {
 127         struct vm_struct *area;
 128         unsigned long phys_page;
 129         unsigned long size_page;
 130         unsigned long io_virt_offset;
 131
 132         phys_page = _ALIGN_DOWN(hose->io_base_phys, PAGE_SIZE);
 133         size_page = _ALIGN_UP(hose->pci_io_size, PAGE_SIZE);
 134
 135         /* Make sure IO area address is clear */
 136         hose->io_base_alloc = NULL;
 137
 138         /* If there's no IO to map on that bus, get away too */
 139         if (hose->pci_io_size == 0 || hose->io_base_phys == 0)
 140                 return 0;
 141
 142         /* Let's allocate some IO space for that guy. We don't pass
 143          * VM_IOREMAP because we don't care about alignment tricks that
 144          * the core does in that case. Maybe we should due to stupid card
 145          * with incomplete address decoding but I'd rather not deal with
 146          * those outside of the reserved 64K legacy region.
 147          */
 148         area = __get_vm_area(size_page, 0, PHB_IO_BASE, PHB_IO_END);
 149         if (area == NULL)
 150                 return -ENOMEM;
 151         hose->io_base_alloc = area->addr;
 152         hose->io_base_virt = (void __iomem *)(area->addr +
 153                                               hose->io_base_phys - phys_page);
 154
 155         pr_debug("IO mapping for PHB %s\n", hose->dn->full_name);
 156         pr_debug("  phys=0x%016llx, virt=0x%p (alloc=0x%p)\n",
 157                  hose->io_base_phys, hose->io_base_virt, hose->io_base_alloc);
 158         pr_debug("  size=0x%016llx (alloc=0x%016lx)\n",
 159                  hose->pci_io_size, size_page);
 160
 161         /* Establish the mapping */
 162         if (__ioremap_at(phys_page, area->addr, size_page,
 163                          _PAGE_NO_CACHE | _PAGE_GUARDED) == NULL)
 164                 return -ENOMEM;
 165
 166         /* Fixup hose IO resource */
 167         io_virt_offset = pcibios_io_space_offset(hose);
 168         hose->io_resource.start += io_virt_offset;
 169         hose->io_resource.end += io_virt_offset;
 170
 171         pr_debug("  hose->io_resource=%pR\n", &hose->io_resource);
 172
 173         return 0;
 174 }
 175
 176 int pcibios_map_io_space(struct pci_bus *bus)
 177 {
 178         WARN_ON(bus == NULL);
 179
 180         /* If this not a PHB, nothing to do, page tables still exist and
 181          * thus HPTEs will be faulted in when needed
 182          */
 183         if (bus->self) {
 184                 pr_debug("IO mapping for PCI-PCI bridge %s\n",
 185                          pci_name(bus->self));
 186                 pr_debug("  virt=0x%016llx...0x%016llx\n",
 187                          bus->resource[0]->start + _IO_BASE,
 188                          bus->resource[0]->end + _IO_BASE);
 189                 return 0;
 190         }
 191
 192         return pcibios_map_phb_io_space(pci_bus_to_host(bus));
 193 }
 194 EXPORT_SYMBOL_GPL(pcibios_map_io_space);
 195
 196 void pcibios_setup_phb_io_space(struct pci_controller *hose)
 197 {
 198         pcibios_map_phb_io_space(hose);
 199 }
 200
 201 #define IOBASE_BRIDGE_NUMBER    0
 202 #define IOBASE_MEMORY           1
 203 #define IOBASE_IO               2
 204 #define IOBASE_ISA_IO           3
 205 #define IOBASE_ISA_MEM          4
 206
 207 long sys_pciconfig_iobase(long which, unsigned long in_bus,
 208                           unsigned long in_devfn)
 209 {
 210         struct pci_controller* hose;
 211         struct list_head *ln;
 212         struct pci_bus *bus = NULL;
 213         struct device_node *hose_node;
 214
 215         /* Argh ! Please forgive me for that hack, but that's the
 216          * simplest way to get existing XFree to not lockup on some
 217          * G5 machines... So when something asks for bus 0 io base
 218          * (bus 0 is HT root), we return the AGP one instead.
 219          */
 220         if (in_bus == 0 && of_machine_is_compatible("MacRISC4")) {
 221                 struct device_node *agp;
 222
 223                 agp = of_find_compatible_node(NULL, NULL, "u3-agp");
 224                 if (agp)
 225                         in_bus = 0xf0;
 226                 of_node_put(agp);
 227         }
 228
 229         /* That syscall isn't quite compatible with PCI domains, but it's
 230          * used on pre-domains setup. We return the first match
 231          */
 232
 233         for (ln = pci_root_buses.next; ln != &pci_root_buses; ln = ln->next) {
 234                 bus = pci_bus_b(ln);
 235                 if (in_bus >= bus->number && in_bus <= bus->busn_res.end)
 236                         break;
 237                 bus = NULL;
 238         }
 239         if (bus == NULL || bus->dev.of_node == NULL)
 240                 return -ENODEV;
 241
 242         hose_node = bus->dev.of_node;
 243         hose = PCI_DN(hose_node)->phb;
 244
 245         switch (which) {
 246         case IOBASE_BRIDGE_NUMBER:
 247                 return (long)hose->first_busno;
 248         case IOBASE_MEMORY:
 249                 return (long)hose->mem_offset[0];
 250         case IOBASE_IO:
 251                 return (long)hose->io_base_phys;
 252         case IOBASE_ISA_IO:
 253                 return (long)isa_io_base;
 254         case IOBASE_ISA_MEM:
 255                 return -EINVAL;
 256         }
 257
 258         return -EOPNOTSUPP;
 259 }
 260
 261 #ifdef CONFIG_NUMA
 262 int pcibus_to_node(struct pci_bus *bus)
 263 {
 264         struct pci_controller *phb = pci_bus_to_host(bus);
 265         return phb->node;
 266 }
 267 EXPORT_SYMBOL(pcibus_to_node);
 268 #endif