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