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;
37 * Ignore resources for unimplemented BARs and unused resource slots
44 * Ignore non-moveable resources. This might be legacy resources for
45 * which no functional BAR register exists or another important
46 * system resource we should better not move around in system address
49 if (res->flags & IORESOURCE_PCI_FIXED)
52 pcibios_resource_to_bus(dev, ®ion, res);
54 pr_debug(" got res [%llx:%llx] bus [%llx:%llx] flags %lx for "
55 "BAR %d of %s\n", (unsigned long long)res->start,
56 (unsigned long long)res->end,
57 (unsigned long long)region.start,
58 (unsigned long long)region.end,
59 (unsigned long)res->flags, resno, pci_name(dev));
61 new = region.start | (res->flags & PCI_REGION_FLAG_MASK);
62 if (res->flags & IORESOURCE_IO)
63 mask = (u32)PCI_BASE_ADDRESS_IO_MASK;
65 mask = (u32)PCI_BASE_ADDRESS_MEM_MASK;
68 reg = PCI_BASE_ADDRESS_0 + 4 * resno;
69 } else if (resno == PCI_ROM_RESOURCE) {
70 if (!(res->flags & IORESOURCE_ROM_ENABLE))
72 new |= PCI_ROM_ADDRESS_ENABLE;
73 reg = dev->rom_base_reg;
75 /* Hmm, non-standard resource. */
77 return; /* kill uninitialised var warning */
80 pci_write_config_dword(dev, reg, new);
81 pci_read_config_dword(dev, reg, &check);
83 if ((new ^ check) & mask) {
84 printk(KERN_ERR "PCI: Error while updating region "
85 "%s/%d (%08x != %08x)\n", pci_name(dev), resno,
89 if ((new & (PCI_BASE_ADDRESS_SPACE|PCI_BASE_ADDRESS_MEM_TYPE_MASK)) ==
90 (PCI_BASE_ADDRESS_SPACE_MEMORY|PCI_BASE_ADDRESS_MEM_TYPE_64)) {
91 new = region.start >> 16 >> 16;
92 pci_write_config_dword(dev, reg + 4, new);
93 pci_read_config_dword(dev, reg + 4, &check);
95 printk(KERN_ERR "PCI: Error updating region "
96 "%s/%d (high %08x != %08x)\n",
97 pci_name(dev), resno, new, check);
100 res->flags &= ~IORESOURCE_UNSET;
101 pr_debug("PCI: moved device %s resource %d (%lx) to %x\n",
102 pci_name(dev), resno, res->flags,
103 new & ~PCI_REGION_FLAG_MASK);
106 int pci_claim_resource(struct pci_dev *dev, int resource)
108 struct resource *res = &dev->resource[resource];
109 struct resource *root = NULL;
110 char *dtype = resource < PCI_BRIDGE_RESOURCES ? "device" : "bridge";
113 root = pcibios_select_root(dev, res);
117 err = insert_resource(root, res);
120 printk(KERN_ERR "PCI: %s region %d of %s %s [%llx:%llx]\n",
121 root ? "Address space collision on" :
122 "No parent found for",
123 resource, dtype, pci_name(dev),
124 (unsigned long long)res->start,
125 (unsigned long long)res->end);
131 int pci_assign_resource(struct pci_dev *dev, int resno)
133 struct pci_bus *bus = dev->bus;
134 struct resource *res = dev->resource + resno;
135 resource_size_t size, min, align;
138 size = res->end - res->start + 1;
139 min = (res->flags & IORESOURCE_IO) ? PCIBIOS_MIN_IO : PCIBIOS_MIN_MEM;
140 /* The bridge resources are special, as their
141 size != alignment. Sizing routines return
142 required alignment in the "start" field. */
143 align = (resno < PCI_BRIDGE_RESOURCES) ? size : res->start;
145 /* First, try exact prefetching match.. */
146 ret = pci_bus_alloc_resource(bus, res, size, align, min,
148 pcibios_align_resource, dev);
150 if (ret < 0 && (res->flags & IORESOURCE_PREFETCH)) {
154 * But a prefetching area can handle a non-prefetching
155 * window (it will just not perform as well).
157 ret = pci_bus_alloc_resource(bus, res, size, align, min, 0,
158 pcibios_align_resource, dev);
162 printk(KERN_ERR "PCI: Failed to allocate %s resource "
163 "#%d:%llx@%llx for %s\n",
164 res->flags & IORESOURCE_IO ? "I/O" : "mem",
165 resno, (unsigned long long)size,
166 (unsigned long long)res->start, pci_name(dev));
167 } else if (resno < PCI_BRIDGE_RESOURCES) {
168 pci_update_resource(dev, res, resno);
174 #ifdef CONFIG_EMBEDDED
175 int pci_assign_resource_fixed(struct pci_dev *dev, int resno)
177 struct pci_bus *bus = dev->bus;
178 struct resource *res = dev->resource + resno;
179 unsigned int type_mask;
182 type_mask = IORESOURCE_IO | IORESOURCE_MEM | IORESOURCE_PREFETCH;
184 for (i = 0; i < PCI_BUS_NUM_RESOURCES; i++) {
185 struct resource *r = bus->resource[i];
189 /* type_mask must match */
190 if ((res->flags ^ r->flags) & type_mask)
193 ret = request_resource(r, res);
200 printk(KERN_ERR "PCI: Failed to allocate %s resource "
201 "#%d:%llx@%llx for %s\n",
202 res->flags & IORESOURCE_IO ? "I/O" : "mem",
203 resno, (unsigned long long)(res->end - res->start + 1),
204 (unsigned long long)res->start, pci_name(dev));
205 } else if (resno < PCI_BRIDGE_RESOURCES) {
206 pci_update_resource(dev, res, resno);
211 EXPORT_SYMBOL_GPL(pci_assign_resource_fixed);
214 /* Sort resources by alignment */
215 void pdev_sort_resources(struct pci_dev *dev, struct resource_list *head)
219 for (i = 0; i < PCI_NUM_RESOURCES; i++) {
221 struct resource_list *list, *tmp;
222 resource_size_t r_align;
224 r = &dev->resource[i];
226 if (r->flags & IORESOURCE_PCI_FIXED)
229 r_align = r->end - r->start;
231 if (!(r->flags) || r->parent)
234 printk(KERN_WARNING "PCI: Ignore bogus resource %d "
235 "[%llx:%llx] of %s\n",
236 i, (unsigned long long)r->start,
237 (unsigned long long)r->end, pci_name(dev));
240 r_align = (i < PCI_BRIDGE_RESOURCES) ? r_align + 1 : r->start;
241 for (list = head; ; list = list->next) {
242 resource_size_t align = 0;
243 struct resource_list *ln = list->next;
247 idx = ln->res - &ln->dev->resource[0];
248 align = (idx < PCI_BRIDGE_RESOURCES) ?
249 ln->res->end - ln->res->start + 1 :
252 if (r_align > align) {
253 tmp = kmalloc(sizeof(*tmp), GFP_KERNEL);
255 panic("pdev_sort_resources(): "
256 "kmalloc() failed!\n");