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 "pci.h"
  27
  28
  29 static void
  30 pci_update_resource(struct pci_dev *dev, struct resource *res, int resno)
  31 {
  32         struct pci_bus_region region;
  33         u32 new, check, mask;
  34         int reg;
  35
  36         pcibios_resource_to_bus(dev, &region, res);
  37
  38         pr_debug("  got res [%lx:%lx] bus [%lx:%lx] flags %lx for "
  39                  "BAR %d of %s\n", res->start, res->end,
  40                  region.start, region.end, res->flags, resno, pci_name(dev));
  41
  42         new = region.start | (res->flags & PCI_REGION_FLAG_MASK);
  43         if (res->flags & IORESOURCE_IO)
  44                 mask = (u32)PCI_BASE_ADDRESS_IO_MASK;
  45         else
  46                 mask = (u32)PCI_BASE_ADDRESS_MEM_MASK;
  47
  48         if (resno < 6) {
  49                 reg = PCI_BASE_ADDRESS_0 + 4 * resno;
  50         } else if (resno == PCI_ROM_RESOURCE) {
  51                 new |= res->flags & IORESOURCE_ROM_ENABLE;
  52                 reg = dev->rom_base_reg;
  53         } else {
  54                 /* Hmm, non-standard resource. */
  55
  56                 return;         /* kill uninitialised var warning */
  57         }
  58
  59         pci_write_config_dword(dev, reg, new);
  60         pci_read_config_dword(dev, reg, &check);
  61
  62         if ((new ^ check) & mask) {
  63                 printk(KERN_ERR "PCI: Error while updating region "
  64                        "%s/%d (%08x != %08x)\n", pci_name(dev), resno,
  65                        new, check);
  66         }
  67
  68         if ((new & (PCI_BASE_ADDRESS_SPACE|PCI_BASE_ADDRESS_MEM_TYPE_MASK)) ==
  69             (PCI_BASE_ADDRESS_SPACE_MEMORY|PCI_BASE_ADDRESS_MEM_TYPE_64)) {
  70                 new = 0; /* currently everyone zeros the high address */
  71                 pci_write_config_dword(dev, reg + 4, new);
  72                 pci_read_config_dword(dev, reg + 4, &check);
  73                 if (check != new) {
  74                         printk(KERN_ERR "PCI: Error updating region "
  75                                "%s/%d (high %08x != %08x)\n",
  76                                pci_name(dev), resno, new, check);
  77                 }
  78         }
  79         res->flags &= ~IORESOURCE_UNSET;
  80         pr_debug("PCI: moved device %s resource %d (%lx) to %x\n",
  81                 pci_name(dev), resno, res->flags,
  82                 new & ~PCI_REGION_FLAG_MASK);
  83 }
  84
  85 int __devinit
  86 pci_claim_resource(struct pci_dev *dev, int resource)
  87 {
  88         struct resource *res = &dev->resource[resource];
  89         struct resource *root = NULL;
  90         char *dtype = resource < PCI_BRIDGE_RESOURCES ? "device" : "bridge";
  91         int err;
  92
  93         if (res->flags & IORESOURCE_IO)
  94                 root = &ioport_resource;
  95         if (res->flags & IORESOURCE_MEM)
  96                 root = &iomem_resource;
  97
  98         err = -EINVAL;
  99         if (root != NULL)
 100                 err = insert_resource(root, res);
 101
 102         if (err) {
 103                 printk(KERN_ERR "PCI: %s region %d of %s %s [%lx:%lx]\n",
 104                        root ? "Address space collision on" :
 105                               "No parent found for",
 106                        resource, dtype, pci_name(dev), res->start, res->end);
 107         }
 108
 109         return err;
 110 }
 111
 112 int pci_assign_resource(struct pci_dev *dev, int resno)
 113 {
 114         struct pci_bus *bus = dev->bus;
 115         struct resource *res = dev->resource + resno;
 116         unsigned long size, min, align;
 117         int ret;
 118
 119         size = res->end - res->start + 1;
 120         min = (res->flags & IORESOURCE_IO) ? PCIBIOS_MIN_IO : PCIBIOS_MIN_MEM;
 121         /* The bridge resources are special, as their
 122            size != alignment. Sizing routines return
 123            required alignment in the "start" field. */
 124         align = (resno < PCI_BRIDGE_RESOURCES) ? size : res->start;
 125
 126         /* First, try exact prefetching match.. */
 127         ret = pci_bus_alloc_resource(bus, res, size, align, min,
 128                                      IORESOURCE_PREFETCH,
 129                                      pcibios_align_resource, dev);
 130
 131         if (ret < 0 && (res->flags & IORESOURCE_PREFETCH)) {
 132                 /*
 133                  * That failed.
 134                  *
 135                  * But a prefetching area can handle a non-prefetching
 136                  * window (it will just not perform as well).
 137                  */
 138                 ret = pci_bus_alloc_resource(bus, res, size, align, min, 0,
 139                                              pcibios_align_resource, dev);
 140         }
 141
 142         if (ret) {
 143                 printk(KERN_ERR "PCI: Failed to allocate %s resource #%d:%lx@%lx for %s\n",
 144                        res->flags & IORESOURCE_IO ? "I/O" : "mem",
 145                        resno, size, res->start, pci_name(dev));
 146         } else if (resno < PCI_BRIDGE_RESOURCES) {
 147                 pci_update_resource(dev, res, resno);
 148         }
 149
 150         return ret;
 151 }
 152
 153 /* Sort resources by alignment */
 154 void __devinit
 155 pdev_sort_resources(struct pci_dev *dev, struct resource_list *head)
 156 {
 157         int i;
 158
 159         for (i = 0; i < PCI_NUM_RESOURCES; i++) {
 160                 struct resource *r;
 161                 struct resource_list *list, *tmp;
 162                 unsigned long r_align;
 163
 164                 r = &dev->resource[i];
 165                 r_align = r->end - r->start;
 166
 167                 if (!(r->flags) || r->parent)
 168                         continue;
 169                 if (!r_align) {
 170                         printk(KERN_WARNING "PCI: Ignore bogus resource %d "
 171                                             "[%lx:%lx] of %s\n",
 172                                             i, r->start, r->end, pci_name(dev));
 173                         continue;
 174                 }
 175                 r_align = (i < PCI_BRIDGE_RESOURCES) ? r_align + 1 : r->start;
 176                 for (list = head; ; list = list->next) {
 177                         unsigned long align = 0;
 178                         struct resource_list *ln = list->next;
 179                         int idx;
 180
 181                         if (ln) {
 182                                 idx = ln->res - &ln->dev->resource[0];
 183                                 align = (idx < PCI_BRIDGE_RESOURCES) ?
 184                                         ln->res->end - ln->res->start + 1 :
 185                                         ln->res->start;
 186                         }
 187                         if (r_align > align) {
 188                                 tmp = kmalloc(sizeof(*tmp), GFP_KERNEL);
 189                                 if (!tmp)
 190                                         panic("pdev_sort_resources(): "
 191                                               "kmalloc() failed!\n");
 192                                 tmp->next = ln;
 193                                 tmp->res = r;
 194                                 tmp->dev = dev;
 195                                 list->next = tmp;
 196                                 break;
 197                         }
 198                 }
 199         }
 200 }