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, ®ion, 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 } 252