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 %pR bus [%#llx-%#llx] "
  53                 "flags %#lx\n", resno, res,
  54                  (unsigned long long)region.start,
  55                  (unsigned long long)region.end,
  56                  (unsigned long)res->flags);
  57
  58         new = region.start | (res->flags & PCI_REGION_FLAG_MASK);
  59         if (res->flags & IORESOURCE_IO)
  60                 mask = (u32)PCI_BASE_ADDRESS_IO_MASK;
  61         else
  62                 mask = (u32)PCI_BASE_ADDRESS_MEM_MASK;
  63
  64         if (resno < 6) {
  65                 reg = PCI_BASE_ADDRESS_0 + 4 * resno;
  66         } else if (resno == PCI_ROM_RESOURCE) {
  67                 if (!(res->flags & IORESOURCE_ROM_ENABLE))
  68                         return;
  69                 new |= PCI_ROM_ADDRESS_ENABLE;
  70                 reg = dev->rom_base_reg;
  71         } else {
  72                 /* Hmm, non-standard resource. */
  73
  74                 return;         /* kill uninitialised var warning */
  75         }
  76
  77         pci_write_config_dword(dev, reg, new);
  78         pci_read_config_dword(dev, reg, &check);
  79
  80         if ((new ^ check) & mask) {
  81                 dev_err(&dev->dev, "BAR %d: error updating (%#08x != %#08x)\n",
  82                         resno, new, check);
  83         }
  84
  85         if ((new & (PCI_BASE_ADDRESS_SPACE|PCI_BASE_ADDRESS_MEM_TYPE_MASK)) ==
  86             (PCI_BASE_ADDRESS_SPACE_MEMORY|PCI_BASE_ADDRESS_MEM_TYPE_64)) {
  87                 new = region.start >> 16 >> 16;
  88                 pci_write_config_dword(dev, reg + 4, new);
  89                 pci_read_config_dword(dev, reg + 4, &check);
  90                 if (check != new) {
  91                         dev_err(&dev->dev, "BAR %d: error updating "
  92                                "(high %#08x != %#08x)\n", resno, new, check);
  93                 }
  94         }
  95         res->flags &= ~IORESOURCE_UNSET;
  96         dev_dbg(&dev->dev, "BAR %d: moved to bus [%#llx-%#llx] flags %#lx\n",
  97                 resno, (unsigned long long)region.start,
  98                 (unsigned long long)region.end, res->flags);
  99 }
 100
 101 int pci_claim_resource(struct pci_dev *dev, int resource)
 102 {
 103         struct resource *res = &dev->resource[resource];
 104         struct resource *root = NULL;
 105         char *dtype = resource < PCI_BRIDGE_RESOURCES ? "device" : "bridge";
 106         int err;
 107
 108         root = pcibios_select_root(dev, res);
 109
 110         err = -EINVAL;
 111         if (root != NULL)
 112                 err = insert_resource(root, res);
 113
 114         if (err) {
 115                 dev_err(&dev->dev, "BAR %d: %s of %s %pR\n",
 116                         resource,
 117                         root ? "address space collision on" :
 118                                 "no parent found for",
 119                         dtype, res);
 120         }
 121
 122         return err;
 123 }
 124
 125 int pci_assign_resource(struct pci_dev *dev, int resno)
 126 {
 127         struct pci_bus *bus = dev->bus;
 128         struct resource *res = dev->resource + resno;
 129         resource_size_t size, min, align;
 130         int ret;
 131
 132         size = resource_size(res);
 133         min = (res->flags & IORESOURCE_IO) ? PCIBIOS_MIN_IO : PCIBIOS_MIN_MEM;
 134
 135         align = resource_alignment(res);
 136         if (!align) {
 137                 dev_err(&dev->dev, "BAR %d: can't allocate resource (bogus "
 138                         "alignment) %pR flags %#lx\n",
 139                         resno, res, res->flags);
 140                 return -EINVAL;
 141         }
 142
 143         /* First, try exact prefetching match.. */
 144         ret = pci_bus_alloc_resource(bus, res, size, align, min,
 145                                      IORESOURCE_PREFETCH,
 146                                      pcibios_align_resource, dev);
 147
 148         if (ret < 0 && (res->flags & IORESOURCE_PREFETCH)) {
 149                 /*
 150                  * That failed.
 151                  *
 152                  * But a prefetching area can handle a non-prefetching
 153                  * window (it will just not perform as well).
 154                  */
 155                 ret = pci_bus_alloc_resource(bus, res, size, align, min, 0,
 156                                              pcibios_align_resource, dev);
 157         }
 158
 159         if (ret) {
 160                 dev_err(&dev->dev, "BAR %d: can't allocate %s resource %pR\n",
 161                         resno, res->flags & IORESOURCE_IO ? "I/O" : "mem", res);
 162         } else {
 163                 res->flags &= ~IORESOURCE_STARTALIGN;
 164                 if (resno < PCI_BRIDGE_RESOURCES)
 165                         pci_update_resource(dev, res, resno);
 166         }
 167
 168         return ret;
 169 }
 170
 171 #if 0
 172 int pci_assign_resource_fixed(struct pci_dev *dev, int resno)
 173 {
 174         struct pci_bus *bus = dev->bus;
 175         struct resource *res = dev->resource + resno;
 176         unsigned int type_mask;
 177         int i, ret = -EBUSY;
 178
 179         type_mask = IORESOURCE_IO | IORESOURCE_MEM | IORESOURCE_PREFETCH;
 180
 181         for (i = 0; i < PCI_BUS_NUM_RESOURCES; i++) {
 182                 struct resource *r = bus->resource[i];
 183                 if (!r)
 184                         continue;
 185
 186                 /* type_mask must match */
 187                 if ((res->flags ^ r->flags) & type_mask)
 188                         continue;
 189
 190                 ret = request_resource(r, res);
 191
 192                 if (ret == 0)
 193                         break;
 194         }
 195
 196         if (ret) {
 197                 dev_err(&dev->dev, "BAR %d: can't allocate %s resource %pR\n",
 198                         resno, res->flags & IORESOURCE_IO ? "I/O" : "mem", res);
 199         } else if (resno < PCI_BRIDGE_RESOURCES) {
 200                 pci_update_resource(dev, res, resno);
 201         }
 202
 203         return ret;
 204 }
 205 EXPORT_SYMBOL_GPL(pci_assign_resource_fixed);
 206 #endif
 207
 208 /* Sort resources by alignment */
 209 void pdev_sort_resources(struct pci_dev *dev, struct resource_list *head)
 210 {
 211         int i;
 212
 213         for (i = 0; i < PCI_NUM_RESOURCES; i++) {
 214                 struct resource *r;
 215                 struct resource_list *list, *tmp;
 216                 resource_size_t r_align;
 217
 218                 r = &dev->resource[i];
 219
 220                 if (r->flags & IORESOURCE_PCI_FIXED)
 221                         continue;
 222
 223                 if (!(r->flags) || r->parent)
 224                         continue;
 225
 226                 r_align = resource_alignment(r);
 227                 if (!r_align) {
 228                         dev_warn(&dev->dev, "BAR %d: bogus alignment "
 229                                 "%pR flags %#lx\n",
 230                                 i, r, r->flags);
 231                         continue;
 232                 }
 233                 for (list = head; ; list = list->next) {
 234                         resource_size_t align = 0;
 235                         struct resource_list *ln = list->next;
 236
 237                         if (ln)
 238                                 align = resource_alignment(ln->res);
 239
 240                         if (r_align > align) {
 241                                 tmp = kmalloc(sizeof(*tmp), GFP_KERNEL);
 242                                 if (!tmp)
 243                                         panic("pdev_sort_resources(): "
 244                                               "kmalloc() failed!\n");
 245                                 tmp->next = ln;
 246                                 tmp->res = r;
 247                                 tmp->dev = dev;
 248                                 list->next = tmp;
 249                                 break;
 250                         }
 251                 }
 252         }
 253 }
 254
 255 int pci_enable_resources(struct pci_dev *dev, int mask)
 256 {
 257         u16 cmd, old_cmd;
 258         int i;
 259         struct resource *r;
 260
 261         pci_read_config_word(dev, PCI_COMMAND, &cmd);
 262         old_cmd = cmd;
 263
 264         for (i = 0; i < PCI_NUM_RESOURCES; i++) {
 265                 if (!(mask & (1 << i)))
 266                         continue;
 267
 268                 r = &dev->resource[i];
 269
 270                 if (!(r->flags & (IORESOURCE_IO | IORESOURCE_MEM)))
 271                         continue;
 272                 if ((i == PCI_ROM_RESOURCE) &&
 273                                 (!(r->flags & IORESOURCE_ROM_ENABLE)))
 274                         continue;
 275
 276                 if (!r->parent) {
 277                         dev_err(&dev->dev, "device not available because of "
 278                                 "BAR %d %pR collisions\n", i, r);
 279                         return -EINVAL;
 280                 }
 281
 282                 if (r->flags & IORESOURCE_IO)
 283                         cmd |= PCI_COMMAND_IO;
 284                 if (r->flags & IORESOURCE_MEM)
 285                         cmd |= PCI_COMMAND_MEMORY;
 286         }
 287
 288         if (cmd != old_cmd) {
 289                 dev_info(&dev->dev, "enabling device (%04x -> %04x)\n",
 290                          old_cmd, cmd);
 291                 pci_write_config_word(dev, PCI_COMMAND, cmd);
 292         }
 293         return 0;
 294 }