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         /*
  37          * Ignore resources for unimplemented BARs and unused resource slots
  38          * for 64 bit BARs.
  39          */
  40         if (!res->flags)
  41                 return;
  42
  43         /*
  44          * Ignore non-moveable resources.  This might be legacy resources for
  45          * which no functional BAR register exists or another important
  46          * system resource we should better not move around in system address
  47          * space.
  48          */
  49         if (res->flags & IORESOURCE_PCI_FIXED)
  50                 return;
  51
  52         pcibios_resource_to_bus(dev, &region, res);
  53
  54         pr_debug("  got res [%llx:%llx] bus [%llx:%llx] flags %lx for "
  55                  "BAR %d of %s\n", (unsigned long long)res->start,
  56                  (unsigned long long)res->end,
  57                  (unsigned long long)region.start,
  58                  (unsigned long long)region.end,
  59                  (unsigned long)res->flags, resno, pci_name(dev));
  60
  61         new = region.start | (res->flags & PCI_REGION_FLAG_MASK);
  62         if (res->flags & IORESOURCE_IO)
  63                 mask = (u32)PCI_BASE_ADDRESS_IO_MASK;
  64         else
  65                 mask = (u32)PCI_BASE_ADDRESS_MEM_MASK;
  66
  67         if (resno < 6) {
  68                 reg = PCI_BASE_ADDRESS_0 + 4 * resno;
  69         } else if (resno == PCI_ROM_RESOURCE) {
  70                 if (!(res->flags & IORESOURCE_ROM_ENABLE))
  71                         return;
  72                 new |= PCI_ROM_ADDRESS_ENABLE;
  73                 reg = dev->rom_base_reg;
  74         } else {
  75                 /* Hmm, non-standard resource. */
  76
  77                 return;         /* kill uninitialised var warning */
  78         }
  79
  80         pci_write_config_dword(dev, reg, new);
  81         pci_read_config_dword(dev, reg, &check);
  82
  83         if ((new ^ check) & mask) {
  84                 printk(KERN_ERR "PCI: Error while updating region "
  85                        "%s/%d (%08x != %08x)\n", pci_name(dev), resno,
  86                        new, check);
  87         }
  88
  89         if ((new & (PCI_BASE_ADDRESS_SPACE|PCI_BASE_ADDRESS_MEM_TYPE_MASK)) ==
  90             (PCI_BASE_ADDRESS_SPACE_MEMORY|PCI_BASE_ADDRESS_MEM_TYPE_64)) {
  91                 new = region.start >> 16 >> 16;
  92                 pci_write_config_dword(dev, reg + 4, new);
  93                 pci_read_config_dword(dev, reg + 4, &check);
  94                 if (check != new) {
  95                         printk(KERN_ERR "PCI: Error updating region "
  96                                "%s/%d (high %08x != %08x)\n",
  97                                pci_name(dev), resno, new, check);
  98                 }
  99         }
 100         res->flags &= ~IORESOURCE_UNSET;
 101         pr_debug("PCI: moved device %s resource %d (%lx) to %x\n",
 102                 pci_name(dev), resno, res->flags,
 103                 new & ~PCI_REGION_FLAG_MASK);
 104 }
 105
 106 int pci_claim_resource(struct pci_dev *dev, int resource)
 107 {
 108         struct resource *res = &dev->resource[resource];
 109         struct resource *root = NULL;
 110         char *dtype = resource < PCI_BRIDGE_RESOURCES ? "device" : "bridge";
 111         int err;
 112
 113         root = pcibios_select_root(dev, res);
 114
 115         err = -EINVAL;
 116         if (root != NULL)
 117                 err = insert_resource(root, res);
 118
 119         if (err) {
 120                 printk(KERN_ERR "PCI: %s region %d of %s %s [%llx:%llx]\n",
 121                         root ? "Address space collision on" :
 122                                 "No parent found for",
 123                         resource, dtype, pci_name(dev),
 124                         (unsigned long long)res->start,
 125                         (unsigned long long)res->end);
 126         }
 127
 128         return err;
 129 }
 130
 131 int pci_assign_resource(struct pci_dev *dev, int resno)
 132 {
 133         struct pci_bus *bus = dev->bus;
 134         struct resource *res = dev->resource + resno;
 135         resource_size_t size, min, align;
 136         int ret;
 137
 138         size = res->end - res->start + 1;
 139         min = (res->flags & IORESOURCE_IO) ? PCIBIOS_MIN_IO : PCIBIOS_MIN_MEM;
 140         /* The bridge resources are special, as their
 141            size != alignment. Sizing routines return
 142            required alignment in the "start" field. */
 143         align = (resno < PCI_BRIDGE_RESOURCES) ? size : res->start;
 144
 145         /* First, try exact prefetching match.. */
 146         ret = pci_bus_alloc_resource(bus, res, size, align, min,
 147                                      IORESOURCE_PREFETCH,
 148                                      pcibios_align_resource, dev);
 149
 150         if (ret < 0 && (res->flags & IORESOURCE_PREFETCH)) {
 151                 /*
 152                  * That failed.
 153                  *
 154                  * But a prefetching area can handle a non-prefetching
 155                  * window (it will just not perform as well).
 156                  */
 157                 ret = pci_bus_alloc_resource(bus, res, size, align, min, 0,
 158                                              pcibios_align_resource, dev);
 159         }
 160
 161         if (ret) {
 162                 printk(KERN_ERR "PCI: Failed to allocate %s resource "
 163                         "#%d:%llx@%llx for %s\n",
 164                         res->flags & IORESOURCE_IO ? "I/O" : "mem",
 165                         resno, (unsigned long long)size,
 166                         (unsigned long long)res->start, pci_name(dev));
 167         } else if (resno < PCI_BRIDGE_RESOURCES) {
 168                 pci_update_resource(dev, res, resno);
 169         }
 170
 171         return ret;
 172 }
 173
 174 #ifdef CONFIG_EMBEDDED
 175 int pci_assign_resource_fixed(struct pci_dev *dev, int resno)
 176 {
 177         struct pci_bus *bus = dev->bus;
 178         struct resource *res = dev->resource + resno;
 179         unsigned int type_mask;
 180         int i, ret = -EBUSY;
 181
 182         type_mask = IORESOURCE_IO | IORESOURCE_MEM | IORESOURCE_PREFETCH;
 183
 184         for (i = 0; i < PCI_BUS_NUM_RESOURCES; i++) {
 185                 struct resource *r = bus->resource[i];
 186                 if (!r)
 187                         continue;
 188
 189                 /* type_mask must match */
 190                 if ((res->flags ^ r->flags) & type_mask)
 191                         continue;
 192
 193                 ret = request_resource(r, res);
 194
 195                 if (ret == 0)
 196                         break;
 197         }
 198
 199         if (ret) {
 200                 printk(KERN_ERR "PCI: Failed to allocate %s resource "
 201                                 "#%d:%llx@%llx for %s\n",
 202                         res->flags & IORESOURCE_IO ? "I/O" : "mem",
 203                         resno, (unsigned long long)(res->end - res->start + 1),
 204                         (unsigned long long)res->start, pci_name(dev));
 205         } else if (resno < PCI_BRIDGE_RESOURCES) {
 206                 pci_update_resource(dev, res, resno);
 207         }
 208
 209         return ret;
 210 }
 211 EXPORT_SYMBOL_GPL(pci_assign_resource_fixed);
 212 #endif
 213
 214 /* Sort resources by alignment */
 215 void pdev_sort_resources(struct pci_dev *dev, struct resource_list *head)
 216 {
 217         int i;
 218
 219         for (i = 0; i < PCI_NUM_RESOURCES; i++) {
 220                 struct resource *r;
 221                 struct resource_list *list, *tmp;
 222                 resource_size_t r_align;
 223
 224                 r = &dev->resource[i];
 225
 226                 if (r->flags & IORESOURCE_PCI_FIXED)
 227                         continue;
 228
 229                 r_align = r->end - r->start;
 230
 231                 if (!(r->flags) || r->parent)
 232                         continue;
 233                 if (!r_align) {
 234                         printk(KERN_WARNING "PCI: Ignore bogus resource %d "
 235                                 "[%llx:%llx] of %s\n",
 236                                 i, (unsigned long long)r->start,
 237                                 (unsigned long long)r->end, pci_name(dev));
 238                         continue;
 239                 }
 240                 r_align = (i < PCI_BRIDGE_RESOURCES) ? r_align + 1 : r->start;
 241                 for (list = head; ; list = list->next) {
 242                         resource_size_t align = 0;
 243                         struct resource_list *ln = list->next;
 244                         int idx;
 245
 246                         if (ln) {
 247                                 idx = ln->res - &ln->dev->resource[0];
 248                                 align = (idx < PCI_BRIDGE_RESOURCES) ?
 249                                         ln->res->end - ln->res->start + 1 :
 250                                         ln->res->start;
 251                         }
 252                         if (r_align > align) {
 253                                 tmp = kmalloc(sizeof(*tmp), GFP_KERNEL);
 254                                 if (!tmp)
 255                                         panic("pdev_sort_resources(): "
 256                                               "kmalloc() failed!\n");
 257                                 tmp->next = ln;
 258                                 tmp->res = r;
 259                                 tmp->dev = dev;
 260                                 list->next = tmp;
 261                                 break;
 262                         }
 263                 }
 264         }
 265 }