1 /* 2 * drivers/pci/bus.c 3 * 4 * From setup-res.c, by: 5 * Dave Rusling (david.rusling@reo.mts.dec.com) 6 * David Mosberger (davidm@cs.arizona.edu) 7 * David Miller (davem@redhat.com) 8 * Ivan Kokshaysky (ink@jurassic.park.msu.ru) 9 */ 10 #include <linux/module.h> 11 #include <linux/kernel.h> 12 #include <linux/pci.h> 13 #include <linux/errno.h> 14 #include <linux/ioport.h> 15 #include <linux/proc_fs.h> 16 #include <linux/init.h> 17 18 #include "pci.h" 19 20 /** 21 * pci_bus_alloc_resource - allocate a resource from a parent bus 22 * @bus: PCI bus 23 * @res: resource to allocate 24 * @size: size of resource to allocate 25 * @align: alignment of resource to allocate 26 * @min: minimum /proc/iomem address to allocate 27 * @type_mask: IORESOURCE_* type flags 28 * @alignf: resource alignment function 29 * @alignf_data: data argument for resource alignment function 30 * 31 * Given the PCI bus a device resides on, the size, minimum address, 32 * alignment and type, try to find an acceptable resource allocation 33 * for a specific device resource. 34 */ 35 int 36 pci_bus_alloc_resource(struct pci_bus *bus, struct resource *res, 37 unsigned long size, unsigned long align, unsigned long min, 38 unsigned int type_mask, 39 void (*alignf)(void *, struct resource *, 40 unsigned long, unsigned long), 41 void *alignf_data) 42 { 43 int i, ret = -ENOMEM; 44 45 type_mask |= IORESOURCE_IO | IORESOURCE_MEM; 46 47 for (i = 0; i < PCI_BUS_NUM_RESOURCES; i++) { 48 struct resource *r = bus->resource[i]; 49 if (!r) 50 continue; 51 52 /* type_mask must match */ 53 if ((res->flags ^ r->flags) & type_mask) 54 continue; 55 56 /* We cannot allocate a non-prefetching resource 57 from a pre-fetching area */ 58 if ((r->flags & IORESOURCE_PREFETCH) && 59 !(res->flags & IORESOURCE_PREFETCH)) 60 continue; 61 62 /* Ok, try it out.. */ 63 ret = allocate_resource(r, res, size, min, -1, align, 64 alignf, alignf_data); 65 if (ret == 0) 66 break; 67 } 68 return ret; 69 } 70 71 /** 72 * add a single device 73 * @dev: device to add 74 * 75 * This adds a single pci device to the global 76 * device list and adds sysfs and procfs entries 77 */ 78 void __devinit pci_bus_add_device(struct pci_dev *dev) 79 { 80 device_add(&dev->dev); 81 82 spin_lock(&pci_bus_lock); 83 list_add_tail(&dev->global_list, &pci_devices); 84 spin_unlock(&pci_bus_lock); 85 86 pci_proc_attach_device(dev); 87 pci_create_sysfs_dev_files(dev); 88 } 89 90 /** 91 * pci_bus_add_devices - insert newly discovered PCI devices 92 * @bus: bus to check for new devices 93 * 94 * Add newly discovered PCI devices (which are on the bus->devices 95 * list) to the global PCI device list, add the sysfs and procfs 96 * entries. Where a bridge is found, add the discovered bus to 97 * the parents list of child buses, and recurse (breadth-first 98 * to be compatible with 2.4) 99 * 100 * Call hotplug for each new devices. 101 */ 102 void __devinit pci_bus_add_devices(struct pci_bus *bus) 103 { 104 struct pci_dev *dev; 105 106 list_for_each_entry(dev, &bus->devices, bus_list) { 107 /* 108 * Skip already-present devices (which are on the 109 * global device list.) 110 */ 111 if (!list_empty(&dev->global_list)) 112 continue; 113 pci_bus_add_device(dev); 114 } 115 116 list_for_each_entry(dev, &bus->devices, bus_list) { 117 118 BUG_ON(list_empty(&dev->global_list)); 119 120 /* 121 * If there is an unattached subordinate bus, attach 122 * it and then scan for unattached PCI devices. 123 */ 124 if (dev->subordinate && list_empty(&dev->subordinate->node)) { 125 spin_lock(&pci_bus_lock); 126 list_add_tail(&dev->subordinate->node, &dev->bus->children); 127 spin_unlock(&pci_bus_lock); 128 pci_bus_add_devices(dev->subordinate); 129 130 sysfs_create_link(&dev->subordinate->class_dev.kobj, &dev->dev.kobj, "bridge"); 131 } 132 } 133 } 134 135 void pci_enable_bridges(struct pci_bus *bus) 136 { 137 struct pci_dev *dev; 138 139 list_for_each_entry(dev, &bus->devices, bus_list) { 140 if (dev->subordinate) { 141 pci_enable_device(dev); 142 pci_set_master(dev); 143 pci_enable_bridges(dev->subordinate); 144 } 145 } 146 } 147 148 EXPORT_SYMBOL(pci_bus_alloc_resource); 149 EXPORT_SYMBOL_GPL(pci_bus_add_device); 150 EXPORT_SYMBOL(pci_bus_add_devices); 151 EXPORT_SYMBOL(pci_enable_bridges); 152