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 [%lx:%lx] flags %lx for " 55 "BAR %d of %s\n", (unsigned long long)res->start, 56 (unsigned long long)res->end, 57 region.start, region.end, res->flags, resno, pci_name(dev)); 58 59 new = region.start | (res->flags & PCI_REGION_FLAG_MASK); 60 if (res->flags & IORESOURCE_IO) 61 mask = (u32)PCI_BASE_ADDRESS_IO_MASK; 62 else 63 mask = (u32)PCI_BASE_ADDRESS_MEM_MASK; 64 65 if (resno < 6) { 66 reg = PCI_BASE_ADDRESS_0 + 4 * resno; 67 } else if (resno == PCI_ROM_RESOURCE) { 68 if (!(res->flags & IORESOURCE_ROM_ENABLE)) 69 return; 70 new |= PCI_ROM_ADDRESS_ENABLE; 71 reg = dev->rom_base_reg; 72 } else { 73 /* Hmm, non-standard resource. */ 74 75 return; /* kill uninitialised var warning */ 76 } 77 78 pci_write_config_dword(dev, reg, new); 79 pci_read_config_dword(dev, reg, &check); 80 81 if ((new ^ check) & mask) { 82 printk(KERN_ERR "PCI: Error while updating region " 83 "%s/%d (%08x != %08x)\n", pci_name(dev), resno, 84 new, check); 85 } 86 87 if ((new & (PCI_BASE_ADDRESS_SPACE|PCI_BASE_ADDRESS_MEM_TYPE_MASK)) == 88 (PCI_BASE_ADDRESS_SPACE_MEMORY|PCI_BASE_ADDRESS_MEM_TYPE_64)) { 89 new = region.start >> 16 >> 16; 90 pci_write_config_dword(dev, reg + 4, new); 91 pci_read_config_dword(dev, reg + 4, &check); 92 if (check != new) { 93 printk(KERN_ERR "PCI: Error updating region " 94 "%s/%d (high %08x != %08x)\n", 95 pci_name(dev), resno, new, check); 96 } 97 } 98 res->flags &= ~IORESOURCE_UNSET; 99 pr_debug("PCI: moved device %s resource %d (%lx) to %x\n", 100 pci_name(dev), resno, res->flags, 101 new & ~PCI_REGION_FLAG_MASK); 102 } 103 104 int pci_claim_resource(struct pci_dev *dev, int resource) 105 { 106 struct resource *res = &dev->resource[resource]; 107 struct resource *root = NULL; 108 char *dtype = resource < PCI_BRIDGE_RESOURCES ? "device" : "bridge"; 109 int err; 110 111 root = pcibios_select_root(dev, res); 112 113 err = -EINVAL; 114 if (root != NULL) 115 err = insert_resource(root, res); 116 117 if (err) { 118 printk(KERN_ERR "PCI: %s region %d of %s %s [%llx:%llx]\n", 119 root ? "Address space collision on" : 120 "No parent found for", 121 resource, dtype, pci_name(dev), 122 (unsigned long long)res->start, 123 (unsigned long long)res->end); 124 } 125 126 return err; 127 } 128 EXPORT_SYMBOL_GPL(pci_claim_resource); 129 130 int pci_assign_resource(struct pci_dev *dev, int resno) 131 { 132 struct pci_bus *bus = dev->bus; 133 struct resource *res = dev->resource + resno; 134 resource_size_t size, min, align; 135 int ret; 136 137 size = res->end - res->start + 1; 138 min = (res->flags & IORESOURCE_IO) ? PCIBIOS_MIN_IO : PCIBIOS_MIN_MEM; 139 /* The bridge resources are special, as their 140 size != alignment. Sizing routines return 141 required alignment in the "start" field. */ 142 align = (resno < PCI_BRIDGE_RESOURCES) ? size : res->start; 143 144 /* First, try exact prefetching match.. */ 145 ret = pci_bus_alloc_resource(bus, res, size, align, min, 146 IORESOURCE_PREFETCH, 147 pcibios_align_resource, dev); 148 149 if (ret < 0 && (res->flags & IORESOURCE_PREFETCH)) { 150 /* 151 * That failed. 152 * 153 * But a prefetching area can handle a non-prefetching 154 * window (it will just not perform as well). 155 */ 156 ret = pci_bus_alloc_resource(bus, res, size, align, min, 0, 157 pcibios_align_resource, dev); 158 } 159 160 if (ret) { 161 printk(KERN_ERR "PCI: Failed to allocate %s resource " 162 "#%d:%llx@%llx for %s\n", 163 res->flags & IORESOURCE_IO ? "I/O" : "mem", 164 resno, (unsigned long long)size, 165 (unsigned long long)res->start, pci_name(dev)); 166 } else if (resno < PCI_BRIDGE_RESOURCES) { 167 pci_update_resource(dev, res, resno); 168 } 169 170 return ret; 171 } 172 173 #ifdef CONFIG_EMBEDDED 174 int pci_assign_resource_fixed(struct pci_dev *dev, int resno) 175 { 176 struct pci_bus *bus = dev->bus; 177 struct resource *res = dev->resource + resno; 178 unsigned int type_mask; 179 int i, ret = -EBUSY; 180 181 type_mask = IORESOURCE_IO | IORESOURCE_MEM | IORESOURCE_PREFETCH; 182 183 for (i = 0; i < PCI_BUS_NUM_RESOURCES; i++) { 184 struct resource *r = bus->resource[i]; 185 if (!r) 186 continue; 187 188 /* type_mask must match */ 189 if ((res->flags ^ r->flags) & type_mask) 190 continue; 191 192 ret = request_resource(r, res); 193 194 if (ret == 0) 195 break; 196 } 197 198 if (ret) { 199 printk(KERN_ERR "PCI: Failed to allocate %s resource " 200 "#%d:%llx@%llx for %s\n", 201 res->flags & IORESOURCE_IO ? "I/O" : "mem", 202 resno, (unsigned long long)(res->end - res->start + 1), 203 (unsigned long long)res->start, pci_name(dev)); 204 } else if (resno < PCI_BRIDGE_RESOURCES) { 205 pci_update_resource(dev, res, resno); 206 } 207 208 return ret; 209 } 210 EXPORT_SYMBOL_GPL(pci_assign_resource_fixed); 211 #endif 212 213 /* Sort resources by alignment */ 214 void pdev_sort_resources(struct pci_dev *dev, struct resource_list *head) 215 { 216 int i; 217 218 for (i = 0; i < PCI_NUM_RESOURCES; i++) { 219 struct resource *r; 220 struct resource_list *list, *tmp; 221 resource_size_t r_align; 222 223 r = &dev->resource[i]; 224 225 if (r->flags & IORESOURCE_PCI_FIXED) 226 continue; 227 228 r_align = r->end - r->start; 229 230 if (!(r->flags) || r->parent) 231 continue; 232 if (!r_align) { 233 printk(KERN_WARNING "PCI: Ignore bogus resource %d " 234 "[%llx:%llx] of %s\n", 235 i, (unsigned long long)r->start, 236 (unsigned long long)r->end, pci_name(dev)); 237 continue; 238 } 239 r_align = (i < PCI_BRIDGE_RESOURCES) ? r_align + 1 : r->start; 240 for (list = head; ; list = list->next) { 241 resource_size_t align = 0; 242 struct resource_list *ln = list->next; 243 int idx; 244 245 if (ln) { 246 idx = ln->res - &ln->dev->resource[0]; 247 align = (idx < PCI_BRIDGE_RESOURCES) ? 248 ln->res->end - ln->res->start + 1 : 249 ln->res->start; 250 } 251 if (r_align > align) { 252 tmp = kmalloc(sizeof(*tmp), GFP_KERNEL); 253 if (!tmp) 254 panic("pdev_sort_resources(): " 255 "kmalloc() failed!\n"); 256 tmp->next = ln; 257 tmp->res = r; 258 tmp->dev = dev; 259 list->next = tmp; 260 break; 261 } 262 } 263 } 264 } 265