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 pci_update_resource(struct pci_dev *dev, struct resource *res, int resno)
  30 {
  31         struct pci_bus_region region;
  32         u32 new, check, mask;
  33         int reg;
  34
  35         /*
  36          * Ignore resources for unimplemented BARs and unused resource slots
  37          * for 64 bit BARs.
  38          */
  39         if (!res->flags)
  40                 return;
  41
  42         /*
  43          * Ignore non-moveable resources.  This might be legacy resources for
  44          * which no functional BAR register exists or another important
  45          * system resource we shouldn't move around.
  46          */
  47         if (res->flags & IORESOURCE_PCI_FIXED)
  48                 return;
  49
  50         pcibios_resource_to_bus(dev, &region, res);
  51
  52         dev_dbg(&dev->dev, "BAR %d: got res [%#llx-%#llx] bus [%#llx-%#llx] "
  53                 "flags %#lx\n", resno,
  54                  (unsigned long long)res->start,
  55                  (unsigned long long)res->end,
  56                  (unsigned long long)region.start,
  57                  (unsigned long long)region.end,
  58                  (unsigned long)res->flags);
  59
  60         new = region.start | (res->flags & PCI_REGION_FLAG_MASK);
  61         if (res->flags & IORESOURCE_IO)
  62                 mask = (u32)PCI_BASE_ADDRESS_IO_MASK;
  63         else
  64                 mask = (u32)PCI_BASE_ADDRESS_MEM_MASK;
  65
  66         if (resno < 6) {
  67                 reg = PCI_BASE_ADDRESS_0 + 4 * resno;
  68         } else if (resno == PCI_ROM_RESOURCE) {
  69                 if (!(res->flags & IORESOURCE_ROM_ENABLE))
  70                         return;
  71                 new |= PCI_ROM_ADDRESS_ENABLE;
  72                 reg = dev->rom_base_reg;
  73         } else {
  74                 /* Hmm, non-standard resource. */
  75
  76                 return;         /* kill uninitialised var warning */
  77         }
  78
  79         pci_write_config_dword(dev, reg, new);
  80         pci_read_config_dword(dev, reg, &check);
  81
  82         if ((new ^ check) & mask) {
  83                 dev_err(&dev->dev, "BAR %d: error updating (%#08x != %#08x)\n",
  84                         resno, 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                         dev_err(&dev->dev, "BAR %d: error updating "
  94                                "(high %#08x != %#08x)\n", resno, new, check);
  95                 }
  96         }
  97         res->flags &= ~IORESOURCE_UNSET;
  98         dev_dbg(&dev->dev, "BAR %d: moved to bus [%#llx-%#llx] flags %#lx\n",
  99                 resno, (unsigned long long)region.start,
 100                 (unsigned long long)region.end, res->flags);
 101 }
 102
 103 int pci_claim_resource(struct pci_dev *dev, int resource)
 104 {
 105         struct resource *res = &dev->resource[resource];
 106         struct resource *root = NULL;
 107         char *dtype = resource < PCI_BRIDGE_RESOURCES ? "device" : "bridge";
 108         int err;
 109
 110         root = pcibios_select_root(dev, res);
 111
 112         err = -EINVAL;
 113         if (root != NULL)
 114                 err = insert_resource(root, res);
 115
 116         if (err) {
 117                 dev_err(&dev->dev, "BAR %d: %s of %s [%#llx-%#llx]\n",
 118                         resource,
 119                         root ? "address space collision on" :
 120                                 "no parent found for",
 121                         dtype,
 122                         (unsigned long long)res->start,
 123                         (unsigned long long)res->end);
 124         }
 125
 126         return err;
 127 }
 128
 129 int pci_assign_resource(struct pci_dev *dev, int resno)
 130 {
 131         struct pci_bus *bus = dev->bus;
 132         struct resource *res = dev->resource + resno;
 133         resource_size_t size, min, align;
 134         int ret;
 135
 136         size = res->end - res->start + 1;
 137         min = (res->flags & IORESOURCE_IO) ? PCIBIOS_MIN_IO : PCIBIOS_MIN_MEM;
 138
 139         align = resource_alignment(res);
 140         if (!align) {
 141                 dev_err(&dev->dev, "BAR %d: can't allocate resource (bogus "
 142                         "alignment) [%#llx-%#llx] flags %#lx\n",
 143                         resno, (unsigned long long)res->start,
 144                         (unsigned long long)res->end, res->flags);
 145                 return -EINVAL;
 146         }
 147
 148         /* First, try exact prefetching match.. */
 149         ret = pci_bus_alloc_resource(bus, res, size, align, min,
 150                                      IORESOURCE_PREFETCH,
 151                                      pcibios_align_resource, dev);
 152
 153         if (ret < 0 && (res->flags & IORESOURCE_PREFETCH)) {
 154                 /*
 155                  * That failed.
 156                  *
 157                  * But a prefetching area can handle a non-prefetching
 158                  * window (it will just not perform as well).
 159                  */
 160                 ret = pci_bus_alloc_resource(bus, res, size, align, min, 0,
 161                                              pcibios_align_resource, dev);
 162         }
 163
 164         if (ret) {
 165                 dev_err(&dev->dev, "BAR %d: can't allocate %s resource "
 166                         "[%#llx-%#llx]\n", resno,
 167                         res->flags & IORESOURCE_IO ? "I/O" : "mem",
 168                         (unsigned long long)res->start,
 169                         (unsigned long long)res->end);
 170         } else {
 171                 res->flags &= ~IORESOURCE_STARTALIGN;
 172                 if (resno < PCI_BRIDGE_RESOURCES)
 173                         pci_update_resource(dev, res, resno);
 174         }
 175
 176         return ret;
 177 }
 178
 179 #if 0
 180 int pci_assign_resource_fixed(struct pci_dev *dev, int resno)
 181 {
 182         struct pci_bus *bus = dev->bus;
 183         struct resource *res = dev->resource + resno;
 184         unsigned int type_mask;
 185         int i, ret = -EBUSY;
 186
 187         type_mask = IORESOURCE_IO | IORESOURCE_MEM | IORESOURCE_PREFETCH;
 188
 189         for (i = 0; i < PCI_BUS_NUM_RESOURCES; i++) {
 190                 struct resource *r = bus->resource[i];
 191                 if (!r)
 192                         continue;
 193
 194                 /* type_mask must match */
 195                 if ((res->flags ^ r->flags) & type_mask)
 196                         continue;
 197
 198                 ret = request_resource(r, res);
 199
 200                 if (ret == 0)
 201                         break;
 202         }
 203
 204         if (ret) {
 205                 dev_err(&dev->dev, "BAR %d: can't allocate %s resource "
 206                         "[%#llx-%#llx\n]", resno,
 207                         res->flags & IORESOURCE_IO ? "I/O" : "mem",
 208                         (unsigned long long)res->start,
 209                         (unsigned long long)res->end);
 210         } else if (resno < PCI_BRIDGE_RESOURCES) {
 211                 pci_update_resource(dev, res, resno);
 212         }
 213
 214         return ret;
 215 }
 216 EXPORT_SYMBOL_GPL(pci_assign_resource_fixed);
 217 #endif
 218
 219 /* Sort resources by alignment */
 220 void pdev_sort_resources(struct pci_dev *dev, struct resource_list *head)
 221 {
 222         int i;
 223
 224         for (i = 0; i < PCI_NUM_RESOURCES; i++) {
 225                 struct resource *r;
 226                 struct resource_list *list, *tmp;
 227                 resource_size_t r_align;
 228
 229                 r = &dev->resource[i];
 230
 231                 if (r->flags & IORESOURCE_PCI_FIXED)
 232                         continue;
 233
 234                 if (!(r->flags) || r->parent)
 235                         continue;
 236
 237                 r_align = resource_alignment(r);
 238                 if (!r_align) {
 239                         dev_warn(&dev->dev, "BAR %d: bogus alignment "
 240                                 "[%#llx-%#llx] flags %#lx\n",
 241                                 i, (unsigned long long)r->start,
 242                                 (unsigned long long)r->end, r->flags);
 243                         continue;
 244                 }
 245                 for (list = head; ; list = list->next) {
 246                         resource_size_t align = 0;
 247                         struct resource_list *ln = list->next;
 248
 249                         if (ln)
 250                                 align = resource_alignment(ln->res);
 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 }
 266
 267 int pci_enable_resources(struct pci_dev *dev, int mask)
 268 {
 269         u16 cmd, old_cmd;
 270         int i;
 271         struct resource *r;
 272
 273         pci_read_config_word(dev, PCI_COMMAND, &cmd);
 274         old_cmd = cmd;
 275
 276         for (i = 0; i < PCI_NUM_RESOURCES; i++) {
 277                 if (!(mask & (1 << i)))
 278                         continue;
 279
 280                 r = &dev->resource[i];
 281
 282                 if (!(r->flags & (IORESOURCE_IO | IORESOURCE_MEM)))
 283                         continue;
 284                 if ((i == PCI_ROM_RESOURCE) &&
 285                                 (!(r->flags & IORESOURCE_ROM_ENABLE)))
 286                         continue;
 287
 288                 if (!r->parent) {
 289                         dev_err(&dev->dev, "device not available because of "
 290                                 "BAR %d [%#llx-%#llx] collisions\n", i,
 291                                 (unsigned long long) r->start,
 292                                 (unsigned long long) r->end);
 293                         return -EINVAL;
 294                 }
 295
 296                 if (r->flags & IORESOURCE_IO)
 297                         cmd |= PCI_COMMAND_IO;
 298                 if (r->flags & IORESOURCE_MEM)
 299                         cmd |= PCI_COMMAND_MEMORY;
 300         }
 301
 302         if (cmd != old_cmd) {
 303                 dev_info(&dev->dev, "enabling device (%04x -> %04x)\n",
 304                          old_cmd, cmd);
 305                 pci_write_config_word(dev, PCI_COMMAND, cmd);
 306         }
 307         return 0;
 308 }