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 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         /* Ignore resources for unimplemented BARs and unused resource slots
  37            for 64 bit BARs. */
  38         if (!res->flags)
  39                 return;
  40
  41         pcibios_resource_to_bus(dev, &region, res);
  42
  43         pr_debug("  got res [%lx:%lx] bus [%lx:%lx] flags %lx for "
  44                  "BAR %d of %s\n", res->start, res->end,
  45                  region.start, region.end, res->flags, resno, pci_name(dev));
  46
  47         new = region.start | (res->flags & PCI_REGION_FLAG_MASK);
  48         if (res->flags & IORESOURCE_IO)
  49                 mask = (u32)PCI_BASE_ADDRESS_IO_MASK;
  50         else
  51                 mask = (u32)PCI_BASE_ADDRESS_MEM_MASK;
  52
  53         if (resno < 6) {
  54                 reg = PCI_BASE_ADDRESS_0 + 4 * resno;
  55         } else if (resno == PCI_ROM_RESOURCE) {
  56                 if (!(res->flags & IORESOURCE_ROM_ENABLE))
  57                         return;
  58                 new |= PCI_ROM_ADDRESS_ENABLE;
  59                 reg = dev->rom_base_reg;
  60         } else {
  61                 /* Hmm, non-standard resource. */
  62
  63                 return;         /* kill uninitialised var warning */
  64         }
  65
  66         pci_write_config_dword(dev, reg, new);
  67         pci_read_config_dword(dev, reg, &check);
  68
  69         if ((new ^ check) & mask) {
  70                 printk(KERN_ERR "PCI: Error while updating region "
  71                        "%s/%d (%08x != %08x)\n", pci_name(dev), resno,
  72                        new, check);
  73         }
  74
  75         if ((new & (PCI_BASE_ADDRESS_SPACE|PCI_BASE_ADDRESS_MEM_TYPE_MASK)) ==
  76             (PCI_BASE_ADDRESS_SPACE_MEMORY|PCI_BASE_ADDRESS_MEM_TYPE_64)) {
  77                 new = region.start >> 16 >> 16;
  78                 pci_write_config_dword(dev, reg + 4, new);
  79                 pci_read_config_dword(dev, reg + 4, &check);
  80                 if (check != new) {
  81                         printk(KERN_ERR "PCI: Error updating region "
  82                                "%s/%d (high %08x != %08x)\n",
  83                                pci_name(dev), resno, new, check);
  84                 }
  85         }
  86         res->flags &= ~IORESOURCE_UNSET;
  87         pr_debug("PCI: moved device %s resource %d (%lx) to %x\n",
  88                 pci_name(dev), resno, res->flags,
  89                 new & ~PCI_REGION_FLAG_MASK);
  90 }
  91
  92 int __devinit
  93 pci_claim_resource(struct pci_dev *dev, int resource)
  94 {
  95         struct resource *res = &dev->resource[resource];
  96         struct resource *root = NULL;
  97         char *dtype = resource < PCI_BRIDGE_RESOURCES ? "device" : "bridge";
  98         int err;
  99
 100         if (res->flags & IORESOURCE_IO)
 101                 root = &ioport_resource;
 102         if (res->flags & IORESOURCE_MEM)
 103                 root = &iomem_resource;
 104
 105         err = -EINVAL;
 106         if (root != NULL)
 107                 err = insert_resource(root, res);
 108
 109         if (err) {
 110                 printk(KERN_ERR "PCI: %s region %d of %s %s [%lx:%lx]\n",
 111                        root ? "Address space collision on" :
 112                               "No parent found for",
 113                        resource, dtype, pci_name(dev), res->start, res->end);
 114         }
 115
 116         return err;
 117 }
 118
 119 int pci_assign_resource(struct pci_dev *dev, int resno)
 120 {
 121         struct pci_bus *bus = dev->bus;
 122         struct resource *res = dev->resource + resno;
 123         unsigned long size, min, align;
 124         int ret;
 125
 126         size = res->end - res->start + 1;
 127         min = (res->flags & IORESOURCE_IO) ? PCIBIOS_MIN_IO : PCIBIOS_MIN_MEM;
 128         /* The bridge resources are special, as their
 129            size != alignment. Sizing routines return
 130            required alignment in the "start" field. */
 131         align = (resno < PCI_BRIDGE_RESOURCES) ? size : res->start;
 132
 133         /* First, try exact prefetching match.. */
 134         ret = pci_bus_alloc_resource(bus, res, size, align, min,
 135                                      IORESOURCE_PREFETCH,
 136                                      pcibios_align_resource, dev);
 137
 138         if (ret < 0 && (res->flags & IORESOURCE_PREFETCH)) {
 139                 /*
 140                  * That failed.
 141                  *
 142                  * But a prefetching area can handle a non-prefetching
 143                  * window (it will just not perform as well).
 144                  */
 145                 ret = pci_bus_alloc_resource(bus, res, size, align, min, 0,
 146                                              pcibios_align_resource, dev);
 147         }
 148
 149         if (ret) {
 150                 printk(KERN_ERR "PCI: Failed to allocate %s resource #%d:%lx@%lx for %s\n",
 151                        res->flags & IORESOURCE_IO ? "I/O" : "mem",
 152                        resno, size, res->start, pci_name(dev));
 153         } else if (resno < PCI_BRIDGE_RESOURCES) {
 154                 pci_update_resource(dev, res, resno);
 155         }
 156
 157         return ret;
 158 }
 159
 160 /* Sort resources by alignment */
 161 void __devinit
 162 pdev_sort_resources(struct pci_dev *dev, struct resource_list *head)
 163 {
 164         int i;
 165
 166         for (i = 0; i < PCI_NUM_RESOURCES; i++) {
 167                 struct resource *r;
 168                 struct resource_list *list, *tmp;
 169                 unsigned long r_align;
 170
 171                 r = &dev->resource[i];
 172                 r_align = r->end - r->start;
 173
 174                 if (!(r->flags) || r->parent)
 175                         continue;
 176                 if (!r_align) {
 177                         printk(KERN_WARNING "PCI: Ignore bogus resource %d "
 178                                             "[%lx:%lx] of %s\n",
 179                                             i, r->start, r->end, pci_name(dev));
 180                         continue;
 181                 }
 182                 r_align = (i < PCI_BRIDGE_RESOURCES) ? r_align + 1 : r->start;
 183                 for (list = head; ; list = list->next) {
 184                         unsigned long align = 0;
 185                         struct resource_list *ln = list->next;
 186                         int idx;
 187
 188                         if (ln) {
 189                                 idx = ln->res - &ln->dev->resource[0];
 190                                 align = (idx < PCI_BRIDGE_RESOURCES) ?
 191                                         ln->res->end - ln->res->start + 1 :
 192                                         ln->res->start;
 193                         }
 194                         if (r_align > align) {
 195                                 tmp = kmalloc(sizeof(*tmp), GFP_KERNEL);
 196                                 if (!tmp)
 197                                         panic("pdev_sort_resources(): "
 198                                               "kmalloc() failed!\n");
 199                                 tmp->next = ln;
 200                                 tmp->res = r;
 201                                 tmp->dev = dev;
 202                                 list->next = tmp;
 203                                 break;
 204                         }
 205                 }
 206         }
 207 }