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 #ifdef CONFIG_HOTPLUG
  78
  79 int pcibios_unmap_io_space(struct pci_bus *bus)
  80 {
  81         struct pci_controller *hose;
  82
  83         WARN_ON(bus == NULL);
  84
  85         /* If this is not a PHB, we only flush the hash table over
  86          * the area mapped by this bridge. We don't play with the PTE
  87          * mappings since we might have to deal with sub-page alignemnts
  88          * so flushing the hash table is the only sane way to make sure
  89          * that no hash entries are covering that removed bridge area
  90          * while still allowing other busses overlapping those pages
  91          *
  92          * Note: If we ever support P2P hotplug on Book3E, we'll have
  93          * to do an appropriate TLB flush here too
  94          */
  95         if (bus->self) {
  96 #ifdef CONFIG_PPC_STD_MMU_64
  97                 struct resource *res = bus->resource[0];
  98 #endif
  99
 100                 pr_debug("IO unmapping for PCI-PCI bridge %s\n",
 101                          pci_name(bus->self));
 102
 103 #ifdef CONFIG_PPC_STD_MMU_64
 104                 __flush_hash_table_range(&init_mm, res->start + _IO_BASE,
 105                                          res->end + _IO_BASE + 1);
 106 #endif
 107                 return 0;
 108         }
 109
 110         /* Get the host bridge */
 111         hose = pci_bus_to_host(bus);
 112
 113         /* Check if we have IOs allocated */
 114         if (hose->io_base_alloc == 0)
 115                 return 0;
 116
 117         pr_debug("IO unmapping for PHB %s\n", hose->dn->full_name);
 118         pr_debug("  alloc=0x%p\n", hose->io_base_alloc);
 119
 120         /* This is a PHB, we fully unmap the IO area */
 121         vunmap(hose->io_base_alloc);
 122
 123         return 0;
 124 }
 125 EXPORT_SYMBOL_GPL(pcibios_unmap_io_space);
 126
 127 #endif /* CONFIG_HOTPLUG */
 128
 129 static int __devinit pcibios_map_phb_io_space(struct pci_controller *hose)
 130 {
 131         struct vm_struct *area;
 132         unsigned long phys_page;
 133         unsigned long size_page;
 134         unsigned long io_virt_offset;
 135
 136         phys_page = _ALIGN_DOWN(hose->io_base_phys, PAGE_SIZE);
 137         size_page = _ALIGN_UP(hose->pci_io_size, PAGE_SIZE);
 138
 139         /* Make sure IO area address is clear */
 140         hose->io_base_alloc = NULL;
 141
 142         /* If there's no IO to map on that bus, get away too */
 143         if (hose->pci_io_size == 0 || hose->io_base_phys == 0)
 144                 return 0;
 145
 146         /* Let's allocate some IO space for that guy. We don't pass
 147          * VM_IOREMAP because we don't care about alignment tricks that
 148          * the core does in that case. Maybe we should due to stupid card
 149          * with incomplete address decoding but I'd rather not deal with
 150          * those outside of the reserved 64K legacy region.
 151          */
 152         area = __get_vm_area(size_page, 0, PHB_IO_BASE, PHB_IO_END);
 153         if (area == NULL)
 154                 return -ENOMEM;
 155         hose->io_base_alloc = area->addr;
 156         hose->io_base_virt = (void __iomem *)(area->addr +
 157                                               hose->io_base_phys - phys_page);
 158
 159         pr_debug("IO mapping for PHB %s\n", hose->dn->full_name);
 160         pr_debug("  phys=0x%016llx, virt=0x%p (alloc=0x%p)\n",
 161                  hose->io_base_phys, hose->io_base_virt, hose->io_base_alloc);
 162         pr_debug("  size=0x%016llx (alloc=0x%016lx)\n",
 163                  hose->pci_io_size, size_page);
 164
 165         /* Establish the mapping */
 166         if (__ioremap_at(phys_page, area->addr, size_page,
 167                          _PAGE_NO_CACHE | _PAGE_GUARDED) == NULL)
 168                 return -ENOMEM;
 169
 170         /* Fixup hose IO resource */
 171         io_virt_offset = pcibios_io_space_offset(hose);
 172         hose->io_resource.start += io_virt_offset;
 173         hose->io_resource.end += io_virt_offset;
 174
 175         pr_debug("  hose->io_resource=%pR\n", &hose->io_resource);
 176
 177         return 0;
 178 }
 179
 180 int __devinit pcibios_map_io_space(struct pci_bus *bus)
 181 {
 182         WARN_ON(bus == NULL);
 183
 184         /* If this not a PHB, nothing to do, page tables still exist and
 185          * thus HPTEs will be faulted in when needed
 186          */
 187         if (bus->self) {
 188                 pr_debug("IO mapping for PCI-PCI bridge %s\n",
 189                          pci_name(bus->self));
 190                 pr_debug("  virt=0x%016llx...0x%016llx\n",
 191                          bus->resource[0]->start + _IO_BASE,
 192                          bus->resource[0]->end + _IO_BASE);
 193                 return 0;
 194         }
 195
 196         return pcibios_map_phb_io_space(pci_bus_to_host(bus));
 197 }
 198 EXPORT_SYMBOL_GPL(pcibios_map_io_space);
 199
 200 void __devinit pcibios_setup_phb_io_space(struct pci_controller *hose)
 201 {
 202         pcibios_map_phb_io_space(hose);
 203 }
 204
 205 #define IOBASE_BRIDGE_NUMBER    0
 206 #define IOBASE_MEMORY           1
 207 #define IOBASE_IO               2
 208 #define IOBASE_ISA_IO           3
 209 #define IOBASE_ISA_MEM          4
 210
 211 long sys_pciconfig_iobase(long which, unsigned long in_bus,
 212                           unsigned long in_devfn)
 213 {
 214         struct pci_controller* hose;
 215         struct list_head *ln;
 216         struct pci_bus *bus = NULL;
 217         struct device_node *hose_node;
 218
 219         /* Argh ! Please forgive me for that hack, but that's the
 220          * simplest way to get existing XFree to not lockup on some
 221          * G5 machines... So when something asks for bus 0 io base
 222          * (bus 0 is HT root), we return the AGP one instead.
 223          */
 224         if (in_bus == 0 && of_machine_is_compatible("MacRISC4")) {
 225                 struct device_node *agp;
 226
 227                 agp = of_find_compatible_node(NULL, NULL, "u3-agp");
 228                 if (agp)
 229                         in_bus = 0xf0;
 230                 of_node_put(agp);
 231         }
 232
 233         /* That syscall isn't quite compatible with PCI domains, but it's
 234          * used on pre-domains setup. We return the first match
 235          */
 236
 237         for (ln = pci_root_buses.next; ln != &pci_root_buses; ln = ln->next) {
 238                 bus = pci_bus_b(ln);
 239                 if (in_bus >= bus->number && in_bus <= bus->busn_res.end)
 240                         break;
 241                 bus = NULL;
 242         }
 243         if (bus == NULL || bus->dev.of_node == NULL)
 244                 return -ENODEV;
 245
 246         hose_node = bus->dev.of_node;
 247         hose = PCI_DN(hose_node)->phb;
 248
 249         switch (which) {
 250         case IOBASE_BRIDGE_NUMBER:
 251                 return (long)hose->first_busno;
 252         case IOBASE_MEMORY:
 253                 return (long)hose->pci_mem_offset;
 254         case IOBASE_IO:
 255                 return (long)hose->io_base_phys;
 256         case IOBASE_ISA_IO:
 257                 return (long)isa_io_base;
 258         case IOBASE_ISA_MEM:
 259                 return -EINVAL;
 260         }
 261
 262         return -EOPNOTSUPP;
 263 }
 264
 265 #ifdef CONFIG_NUMA
 266 int pcibus_to_node(struct pci_bus *bus)
 267 {
 268         struct pci_controller *phb = pci_bus_to_host(bus);
 269         return phb->node;
 270 }
 271 EXPORT_SYMBOL(pcibus_to_node);
 272 #endif