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