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 /* 37 * Ignore resources for unimplemented BARs and unused resource slots 38 * for 64 bit BARs. 39 */ 40 if (!res->flags) 41 return; 42 43 /* 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 47 * space. 48 */ 49 if (res->flags & IORESOURCE_PCI_FIXED) 50 return; 51 52 pcibios_resource_to_bus(dev, ®ion, res); 53 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)); 60 61 new = region.start | (res->flags & PCI_REGION_FLAG_MASK); 62 if (res->flags & IORESOURCE_IO) 63 mask = (u32)PCI_BASE_ADDRESS_IO_MASK; 64 else 65 mask = (u32)PCI_BASE_ADDRESS_MEM_MASK; 66 67 if (resno < 6) { 68 reg = PCI_BASE_ADDRESS_0 + 4 * resno; 69 } else if (resno == PCI_ROM_RESOURCE) { 70 if (!(res->flags & IORESOURCE_ROM_ENABLE)) 71 return; 72 new |= PCI_ROM_ADDRESS_ENABLE; 73 reg = dev->rom_base_reg; 74 } else { 75 /* Hmm, non-standard resource. */ 76 77 return; /* kill uninitialised var warning */ 78 } 79 80 pci_write_config_dword(dev, reg, new); 81 pci_read_config_dword(dev, reg, &check); 82 83 if ((new ^ check) & mask) { 84 printk(KERN_ERR "PCI: Error while updating region " 85 "%s/%d (%08x != %08x)\n", pci_name(dev), resno, 86 new, check); 87 } 88 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); 94 if (check != new) { 95 printk(KERN_ERR "PCI: Error updating region " 96 "%s/%d (high %08x != %08x)\n", 97 pci_name(dev), resno, new, check); 98 } 99 } 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); 104 } 105 106 int pci_claim_resource(struct pci_dev *dev, int resource) 107 { 108 struct resource *res = &dev->resource[resource]; 109 struct resource *root = NULL; 110 char *dtype = resource < PCI_BRIDGE_RESOURCES ? "device" : "bridge"; 111 int err; 112 113 root = pcibios_select_root(dev, res); 114 115 err = -EINVAL; 116 if (root != NULL) 117 err = insert_resource(root, res); 118 119 if (err) { 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); 126 } 127 128 return err; 129 } 130 131 int pci_assign_resource(struct pci_dev *dev, int resno) 132 { 133 struct pci_bus *bus = dev->bus; 134 struct resource *res = dev->resource + resno; 135 resource_size_t size, min, align; 136 int ret; 137 138 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; 144 145 /* First, try exact prefetching match.. */ 146 ret = pci_bus_alloc_resource(bus, res, size, align, min, 147 IORESOURCE_PREFETCH, 148 pcibios_align_resource, dev); 149 150 if (ret < 0 && (res->flags & IORESOURCE_PREFETCH)) { 151 /* 152 * That failed. 153 * 154 * But a prefetching area can handle a non-prefetching 155 * window (it will just not perform as well). 156 */ 157 ret = pci_bus_alloc_resource(bus, res, size, align, min, 0, 158 pcibios_align_resource, dev); 159 } 160 161 if (ret) { 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); 169 } 170 171 return ret; 172 } 173 174 #ifdef CONFIG_EMBEDDED 175 int pci_assign_resource_fixed(struct pci_dev *dev, int resno) 176 { 177 struct pci_bus *bus = dev->bus; 178 struct resource *res = dev->resource + resno; 179 unsigned int type_mask; 180 int i, ret = -EBUSY; 181 182 type_mask = IORESOURCE_IO | IORESOURCE_MEM | IORESOURCE_PREFETCH; 183 184 for (i = 0; i < PCI_BUS_NUM_RESOURCES; i++) { 185 struct resource *r = bus->resource[i]; 186 if (!r) 187 continue; 188 189 /* type_mask must match */ 190 if ((res->flags ^ r->flags) & type_mask) 191 continue; 192 193 ret = request_resource(r, res); 194 195 if (ret == 0) 196 break; 197 } 198 199 if (ret) { 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); 207 } 208 209 return ret; 210 } 211 EXPORT_SYMBOL_GPL(pci_assign_resource_fixed); 212 #endif 213 214 /* Sort resources by alignment */ 215 void pdev_sort_resources(struct pci_dev *dev, struct resource_list *head) 216 { 217 int i; 218 219 for (i = 0; i < PCI_NUM_RESOURCES; i++) { 220 struct resource *r; 221 struct resource_list *list, *tmp; 222 resource_size_t r_align; 223 224 r = &dev->resource[i]; 225 226 if (r->flags & IORESOURCE_PCI_FIXED) 227 continue; 228 229 r_align = r->end - r->start; 230 231 if (!(r->flags) || r->parent) 232 continue; 233 if (!r_align) { 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)); 238 continue; 239 } 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; 244 int idx; 245 246 if (ln) { 247 idx = ln->res - &ln->dev->resource[0]; 248 align = (idx < PCI_BRIDGE_RESOURCES) ? 249 ln->res->end - ln->res->start + 1 : 250 ln->res->start; 251 } 252 if (r_align > align) { 253 tmp = kmalloc(sizeof(*tmp), GFP_KERNEL); 254 if (!tmp) 255 panic("pdev_sort_resources(): " 256 "kmalloc() failed!\n"); 257 tmp->next = ln; 258 tmp->res = r; 259 tmp->dev = dev; 260 list->next = tmp; 261 break; 262 } 263 } 264 } 265 } 266