2 * drivers/pci/setup-res.c
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)
9 * Support routines for initializing a PCI subsystem.
12 /* fixed for multiple pci buses, 1999 Andrea Arcangeli <andrea@suse.de> */
15 * Nov 2000, Ivan Kokshaysky <ink@jurassic.park.msu.ru>
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>
30 pci_update_resource(struct pci_dev *dev, struct resource *res, int resno)
32 struct pci_bus_region region;
36 /* Ignore resources for unimplemented BARs and unused resource slots
41 pcibios_resource_to_bus(dev, ®ion, res);
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));
48 new = region.start | (res->flags & PCI_REGION_FLAG_MASK);
49 if (res->flags & IORESOURCE_IO)
50 mask = (u32)PCI_BASE_ADDRESS_IO_MASK;
52 mask = (u32)PCI_BASE_ADDRESS_MEM_MASK;
55 reg = PCI_BASE_ADDRESS_0 + 4 * resno;
56 } else if (resno == PCI_ROM_RESOURCE) {
57 if (!(res->flags & IORESOURCE_ROM_ENABLE))
59 new |= PCI_ROM_ADDRESS_ENABLE;
60 reg = dev->rom_base_reg;
62 /* Hmm, non-standard resource. */
64 return; /* kill uninitialised var warning */
67 pci_write_config_dword(dev, reg, new);
68 pci_read_config_dword(dev, reg, &check);
70 if ((new ^ check) & mask) {
71 printk(KERN_ERR "PCI: Error while updating region "
72 "%s/%d (%08x != %08x)\n", pci_name(dev), resno,
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);
82 printk(KERN_ERR "PCI: Error updating region "
83 "%s/%d (high %08x != %08x)\n",
84 pci_name(dev), resno, new, check);
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);
94 pci_claim_resource(struct pci_dev *dev, int resource)
96 struct resource *res = &dev->resource[resource];
97 struct resource *root = NULL;
98 char *dtype = resource < PCI_BRIDGE_RESOURCES ? "device" : "bridge";
101 root = pcibios_select_root(dev, res);
105 err = insert_resource(root, res);
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);
118 EXPORT_SYMBOL_GPL(pci_claim_resource);
120 int pci_assign_resource(struct pci_dev *dev, int resno)
122 struct pci_bus *bus = dev->bus;
123 struct resource *res = dev->resource + resno;
124 resource_size_t size, min, align;
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;
134 /* First, try exact prefetching match.. */
135 ret = pci_bus_alloc_resource(bus, res, size, align, min,
137 pcibios_align_resource, dev);
139 if (ret < 0 && (res->flags & IORESOURCE_PREFETCH)) {
143 * But a prefetching area can handle a non-prefetching
144 * window (it will just not perform as well).
146 ret = pci_bus_alloc_resource(bus, res, size, align, min, 0,
147 pcibios_align_resource, dev);
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);
163 #ifdef CONFIG_EMBEDDED
164 int pci_assign_resource_fixed(struct pci_dev *dev, int resno)
166 struct pci_bus *bus = dev->bus;
167 struct resource *res = dev->resource + resno;
168 unsigned int type_mask;
171 type_mask = IORESOURCE_IO | IORESOURCE_MEM | IORESOURCE_PREFETCH;
173 for (i = 0; i < PCI_BUS_NUM_RESOURCES; i++) {
174 struct resource *r = bus->resource[i];
178 /* type_mask must match */
179 if ((res->flags ^ r->flags) & type_mask)
182 ret = request_resource(r, res);
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);
200 EXPORT_SYMBOL_GPL(pci_assign_resource_fixed);
203 /* Sort resources by alignment */
205 pdev_sort_resources(struct pci_dev *dev, struct resource_list *head)
209 for (i = 0; i < PCI_NUM_RESOURCES; i++) {
211 struct resource_list *list, *tmp;
212 resource_size_t r_align;
214 r = &dev->resource[i];
215 r_align = r->end - r->start;
217 if (!(r->flags) || r->parent)
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));
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;
233 idx = ln->res - &ln->dev->resource[0];
234 align = (idx < PCI_BRIDGE_RESOURCES) ?
235 ln->res->end - ln->res->start + 1 :
238 if (r_align > align) {
239 tmp = kmalloc(sizeof(*tmp), GFP_KERNEL);
241 panic("pdev_sort_resources(): "
242 "kmalloc() failed!\n");