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 static 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 pcibios_resource_to_bus(dev, ®ion, res); 37 38 pr_debug(" got res [%lx:%lx] bus [%lx:%lx] flags %lx for " 39 "BAR %d of %s\n", res->start, res->end, 40 region.start, region.end, res->flags, resno, pci_name(dev)); 41 42 new = region.start | (res->flags & PCI_REGION_FLAG_MASK); 43 if (res->flags & IORESOURCE_IO) 44 mask = (u32)PCI_BASE_ADDRESS_IO_MASK; 45 else 46 mask = (u32)PCI_BASE_ADDRESS_MEM_MASK; 47 48 if (resno < 6) { 49 reg = PCI_BASE_ADDRESS_0 + 4 * resno; 50 } else if (resno == PCI_ROM_RESOURCE) { 51 new |= res->flags & IORESOURCE_ROM_ENABLE; 52 reg = dev->rom_base_reg; 53 } else { 54 /* Hmm, non-standard resource. */ 55 56 return; /* kill uninitialised var warning */ 57 } 58 59 pci_write_config_dword(dev, reg, new); 60 pci_read_config_dword(dev, reg, &check); 61 62 if ((new ^ check) & mask) { 63 printk(KERN_ERR "PCI: Error while updating region " 64 "%s/%d (%08x != %08x)\n", pci_name(dev), resno, 65 new, check); 66 } 67 68 if ((new & (PCI_BASE_ADDRESS_SPACE|PCI_BASE_ADDRESS_MEM_TYPE_MASK)) == 69 (PCI_BASE_ADDRESS_SPACE_MEMORY|PCI_BASE_ADDRESS_MEM_TYPE_64)) { 70 new = 0; /* currently everyone zeros the high address */ 71 pci_write_config_dword(dev, reg + 4, new); 72 pci_read_config_dword(dev, reg + 4, &check); 73 if (check != new) { 74 printk(KERN_ERR "PCI: Error updating region " 75 "%s/%d (high %08x != %08x)\n", 76 pci_name(dev), resno, new, check); 77 } 78 } 79 res->flags &= ~IORESOURCE_UNSET; 80 pr_debug("PCI: moved device %s resource %d (%lx) to %x\n", 81 pci_name(dev), resno, res->flags, 82 new & ~PCI_REGION_FLAG_MASK); 83 } 84 85 int __devinit 86 pci_claim_resource(struct pci_dev *dev, int resource) 87 { 88 struct resource *res = &dev->resource[resource]; 89 struct resource *root = NULL; 90 char *dtype = resource < PCI_BRIDGE_RESOURCES ? "device" : "bridge"; 91 int err; 92 93 if (res->flags & IORESOURCE_IO) 94 root = &ioport_resource; 95 if (res->flags & IORESOURCE_MEM) 96 root = &iomem_resource; 97 98 err = -EINVAL; 99 if (root != NULL) 100 err = insert_resource(root, res); 101 102 if (err) { 103 printk(KERN_ERR "PCI: %s region %d of %s %s [%lx:%lx]\n", 104 root ? "Address space collision on" : 105 "No parent found for", 106 resource, dtype, pci_name(dev), res->start, res->end); 107 } 108 109 return err; 110 } 111 112 int pci_assign_resource(struct pci_dev *dev, int resno) 113 { 114 struct pci_bus *bus = dev->bus; 115 struct resource *res = dev->resource + resno; 116 unsigned long size, min, align; 117 int ret; 118 119 size = res->end - res->start + 1; 120 min = (res->flags & IORESOURCE_IO) ? PCIBIOS_MIN_IO : PCIBIOS_MIN_MEM; 121 /* The bridge resources are special, as their 122 size != alignment. Sizing routines return 123 required alignment in the "start" field. */ 124 align = (resno < PCI_BRIDGE_RESOURCES) ? size : res->start; 125 126 /* First, try exact prefetching match.. */ 127 ret = pci_bus_alloc_resource(bus, res, size, align, min, 128 IORESOURCE_PREFETCH, 129 pcibios_align_resource, dev); 130 131 if (ret < 0 && (res->flags & IORESOURCE_PREFETCH)) { 132 /* 133 * That failed. 134 * 135 * But a prefetching area can handle a non-prefetching 136 * window (it will just not perform as well). 137 */ 138 ret = pci_bus_alloc_resource(bus, res, size, align, min, 0, 139 pcibios_align_resource, dev); 140 } 141 142 if (ret) { 143 printk(KERN_ERR "PCI: Failed to allocate %s resource #%d:%lx@%lx for %s\n", 144 res->flags & IORESOURCE_IO ? "I/O" : "mem", 145 resno, size, res->start, pci_name(dev)); 146 } else if (resno < PCI_BRIDGE_RESOURCES) { 147 pci_update_resource(dev, res, resno); 148 } 149 150 return ret; 151 } 152 153 /* Sort resources by alignment */ 154 void __devinit 155 pdev_sort_resources(struct pci_dev *dev, struct resource_list *head) 156 { 157 int i; 158 159 for (i = 0; i < PCI_NUM_RESOURCES; i++) { 160 struct resource *r; 161 struct resource_list *list, *tmp; 162 unsigned long r_align; 163 164 r = &dev->resource[i]; 165 r_align = r->end - r->start; 166 167 if (!(r->flags) || r->parent) 168 continue; 169 if (!r_align) { 170 printk(KERN_WARNING "PCI: Ignore bogus resource %d " 171 "[%lx:%lx] of %s\n", 172 i, r->start, r->end, pci_name(dev)); 173 continue; 174 } 175 r_align = (i < PCI_BRIDGE_RESOURCES) ? r_align + 1 : r->start; 176 for (list = head; ; list = list->next) { 177 unsigned long align = 0; 178 struct resource_list *ln = list->next; 179 int idx; 180 181 if (ln) { 182 idx = ln->res - &ln->dev->resource[0]; 183 align = (idx < PCI_BRIDGE_RESOURCES) ? 184 ln->res->end - ln->res->start + 1 : 185 ln->res->start; 186 } 187 if (r_align > align) { 188 tmp = kmalloc(sizeof(*tmp), GFP_KERNEL); 189 if (!tmp) 190 panic("pdev_sort_resources(): " 191 "kmalloc() failed!\n"); 192 tmp->next = ln; 193 tmp->res = r; 194 tmp->dev = dev; 195 list->next = tmp; 196 break; 197 } 198 } 199 } 200 } 201