drivers/pci/setup-res.c

   1 /*
   2  *      drivers/pci/setup-res.c
   3  *
   4  * Extruded from code written by
   5  *      Dave Rusling (david.rusling@reo.mts.dec.com)
   6  *      David Mosberger (davidm@cs.arizona.edu)
   7  *      David Miller (davem@redhat.com)
   8  *
   9  * Support routines for initializing a PCI subsystem.
  10  */
  11
  12 /* fixed for multiple pci buses, 1999 Andrea Arcangeli <andrea@suse.de> */
  13
  14 /*
  15  * Nov 2000, Ivan Kokshaysky <ink@jurassic.park.msu.ru>
  16  *           Resource sorting
  17  */
  18
  19 #include <linux/init.h>
  20 #include <linux/kernel.h>
  21 #include <linux/pci.h>
  22 #include <linux/errno.h>
  23 #include <linux/ioport.h>
  24 #include <linux/cache.h>
  25 #include <linux/slab.h>
  26 #include <linux/config.h>
  27 #include "pci.h"
  28
  29 //#define DEBUG_CONFIG
  30 #ifdef DEBUG_CONFIG
  31 # define DBGC(args)     printk args
  32 #else
  33 # define DBGC(args)
  34 #endif
  35
  36
  37 static void
  38 pci_update_resource(struct pci_dev *dev, struct resource *res, int resno)
  39 {
  40         struct pci_bus_region region;
  41         u32 new, check, mask;
  42         int reg;
  43
  44         pcibios_resource_to_bus(dev, &region, res);
  45
  46         DBGC((KERN_ERR "  got res [%lx:%lx] bus [%lx:%lx] flags %lx for "
  47               "BAR %d of %s\n", res->start, res->end,
  48               region.start, region.end, res->flags,
  49               resno, pci_name(dev)));
  50
  51 #ifdef CONFIG_ARCH_MOXACPU      // add by Victor Yu. 01-10-2006
  52         if ( res->flags & IORESOURCE_IO )
  53                 new = PHY_ADDRESS(region.start) | (res->flags & PCI_REGION_FLAG_MASK);
  54         else
  55                 new = MEM_PHY_ADDRESS(region.start) | (res->flags & PCI_REGION_FLAG_MASK);
  56 #else
  57         new = region.start | (res->flags & PCI_REGION_FLAG_MASK);
  58 #endif
  59         if (res->flags & IORESOURCE_IO)
  60                 mask = (u32)PCI_BASE_ADDRESS_IO_MASK;
  61         else
  62                 mask = (u32)PCI_BASE_ADDRESS_MEM_MASK;
  63
  64         if (resno < 6) {
  65                 reg = PCI_BASE_ADDRESS_0 + 4 * resno;
  66         } else if (resno == PCI_ROM_RESOURCE) {
  67                 new |= res->flags & PCI_ROM_ADDRESS_ENABLE;
  68                 reg = dev->rom_base_reg;
  69         } else {
  70                 /* Hmm, non-standard resource. */
  71                 BUG();
  72                 return;         /* kill uninitialised var warning */
  73         }
  74
  75         pci_write_config_dword(dev, reg, new);
  76         pci_read_config_dword(dev, reg, &check);
  77
  78         if ((new ^ check) & mask) {
  79                 printk(KERN_ERR "PCI: Error while updating region "
  80                        "%s/%d (%08x != %08x)\n", pci_name(dev), resno,
  81                        new, check);
  82         }
  83
  84         if ((new & (PCI_BASE_ADDRESS_SPACE|PCI_BASE_ADDRESS_MEM_TYPE_MASK)) ==
  85             (PCI_BASE_ADDRESS_SPACE_MEMORY|PCI_BASE_ADDRESS_MEM_TYPE_64)) {
  86                 new = 0; /* currently everyone zeros the high address */
  87                 pci_write_config_dword(dev, reg + 4, new);
  88                 pci_read_config_dword(dev, reg + 4, &check);
  89                 if (check != new) {
  90                         printk(KERN_ERR "PCI: Error updating region "
  91                                "%s/%d (high %08x != %08x)\n",
  92                                pci_name(dev), resno, new, check);
  93                 }
  94         }
  95         res->flags &= ~IORESOURCE_UNSET;
  96         DBGC((KERN_INFO "PCI: moved device %s resource %d (%lx) to %x\n",
  97                 dev->slot_name, resno, res->flags,
  98                 new & ~PCI_REGION_FLAG_MASK));
  99 }
 100
 101 int __init
 102 pci_claim_resource(struct pci_dev *dev, int resource)
 103 {
 104         struct resource *res = &dev->resource[resource];
 105         struct resource *root = NULL;
 106         char *dtype = resource < PCI_BRIDGE_RESOURCES ? "device" : "bridge";
 107         int err;
 108
 109         if (res->flags & IORESOURCE_IO)
 110                 root = &ioport_resource;
 111         if (res->flags & IORESOURCE_MEM)
 112                 root = &iomem_resource;
 113
 114         err = -EINVAL;
 115         if (root != NULL)
 116                 err = insert_resource(root, res);
 117
 118         if (err) {
 119                 printk(KERN_ERR "PCI: %s region %d of %s %s [%lx:%lx]\n",
 120                        root ? "Address space collision on" :
 121                               "No parent found for",
 122                        resource, dtype, pci_name(dev), res->start, res->end);
 123         }
 124
 125         return err;
 126 }
 127
 128 int pci_assign_resource(struct pci_dev *dev, int resno)
 129 {
 130         struct pci_bus *bus = dev->bus;
 131         struct resource *res = dev->resource + resno;
 132         unsigned long size, min, align;
 133         int ret;
 134
 135         size = res->end - res->start + 1;
 136         min = (res->flags & IORESOURCE_IO) ? PCIBIOS_MIN_IO : PCIBIOS_MIN_MEM;
 137         /* The bridge resources are special, as their
 138            size != alignment. Sizing routines return
 139            required alignment in the "start" field. */
 140         align = (resno < PCI_BRIDGE_RESOURCES) ? size : res->start;
 141
 142         /* First, try exact prefetching match.. */
 143         ret = pci_bus_alloc_resource(bus, res, size, align, min,
 144                                      IORESOURCE_PREFETCH,
 145                                      pcibios_align_resource, dev);
 146
 147         if (ret < 0 && (res->flags & IORESOURCE_PREFETCH)) {
 148                 /*
 149                  * That failed.
 150                  *
 151                  * But a prefetching area can handle a non-prefetching
 152                  * window (it will just not perform as well).
 153                  */
 154                 ret = pci_bus_alloc_resource(bus, res, size, align, min, 0,
 155                                              pcibios_align_resource, dev);
 156         }
 157
 158         if (ret) {
 159                 printk(KERN_ERR "PCI: Failed to allocate %s resource #%d:%lx@%lx for %s\n",
 160                        res->flags & IORESOURCE_IO ? "I/O" : "mem",
 161                        resno, size, res->start, pci_name(dev));
 162         } else if (resno < PCI_BRIDGE_RESOURCES) {
 163                 pci_update_resource(dev, res, resno);
 164         }
 165
 166         return ret;
 167 }
 168
 169 /* Sort resources by alignment */
 170 void __devinit
 171 pdev_sort_resources(struct pci_dev *dev, struct resource_list *head)
 172 {
 173         int i;
 174
 175         for (i = 0; i < PCI_NUM_RESOURCES; i++) {
 176                 struct resource *r;
 177                 struct resource_list *list, *tmp;
 178                 unsigned long r_align;
 179
 180                 r = &dev->resource[i];
 181                 r_align = r->end - r->start;
 182
 183                 if (!(r->flags) || r->parent)
 184                         continue;
 185                 if (!r_align) {
 186                         printk(KERN_WARNING "PCI: Ignore bogus resource %d "
 187                                             "[%lx:%lx] of %s\n",
 188                                             i, r->start, r->end, pci_name(dev));
 189                         continue;
 190                 }
 191                 r_align = (i < PCI_BRIDGE_RESOURCES) ? r_align + 1 : r->start;
 192                 for (list = head; ; list = list->next) {
 193                         unsigned long align = 0;
 194                         struct resource_list *ln = list->next;
 195                         int idx;
 196
 197                         if (ln) {
 198                                 idx = ln->res - &ln->dev->resource[0];
 199                                 align = (idx < PCI_BRIDGE_RESOURCES) ?
 200                                         ln->res->end - ln->res->start + 1 :
 201                                         ln->res->start;
 202                         }
 203                         if (r_align > align) {
 204                                 tmp = kmalloc(sizeof(*tmp), GFP_KERNEL);
 205                                 if (!tmp)
 206                                         panic("pdev_sort_resources(): "
 207                                               "kmalloc() failed!\n");
 208                                 tmp->next = ln;
 209                                 tmp->res = r;
 210                                 tmp->dev = dev;
 211                                 list->next = tmp;
 212                                 break;
 213                         }
 214                 }
 215         }
 216 }