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