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