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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 428 | giacomo | 1 | /* |
| 2 | * drivers/pci/bus.c |
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| 3 | * |
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| 4 | * From setup-res.c, by: |
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| 5 | * Dave Rusling (david.rusling@reo.mts.dec.com) |
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| 6 | * David Mosberger (davidm@cs.arizona.edu) |
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| 7 | * David Miller (davem@redhat.com) |
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| 8 | * Ivan Kokshaysky (ink@jurassic.park.msu.ru) |
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| 9 | */ |
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| 430 | giacomo | 10 | #include <linuxcomp.h> |
| 11 | |||
| 428 | giacomo | 12 | #include <linux/module.h> |
| 13 | #include <linux/kernel.h> |
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| 14 | #include <linux/pci.h> |
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| 15 | #include <linux/errno.h> |
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| 16 | #include <linux/ioport.h> |
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| 17 | #include <linux/proc_fs.h> |
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| 18 | #include <linux/init.h> |
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| 19 | |||
| 20 | #include "pci.h" |
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| 21 | |||
| 22 | /** |
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| 23 | * pci_bus_alloc_resource - allocate a resource from a parent bus |
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| 24 | * @bus: PCI bus |
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| 25 | * @res: resource to allocate |
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| 26 | * @size: size of resource to allocate |
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| 27 | * @align: alignment of resource to allocate |
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| 28 | * @min: minimum /proc/iomem address to allocate |
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| 29 | * @type_mask: IORESOURCE_* type flags |
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| 30 | * @alignf: resource alignment function |
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| 31 | * @alignf_data: data argument for resource alignment function |
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| 32 | * |
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| 33 | * Given the PCI bus a device resides on, the size, minimum address, |
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| 34 | * alignment and type, try to find an acceptable resource allocation |
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| 35 | * for a specific device resource. |
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| 36 | */ |
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| 37 | int |
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| 38 | pci_bus_alloc_resource(struct pci_bus *bus, struct resource *res, |
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| 39 | unsigned long size, unsigned long align, unsigned long min, |
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| 40 | unsigned int type_mask, |
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| 41 | void (*alignf)(void *, struct resource *, |
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| 42 | unsigned long, unsigned long), |
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| 43 | void *alignf_data) |
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| 44 | { |
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| 45 | int i, ret = -ENOMEM; |
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| 46 | |||
| 47 | type_mask |= IORESOURCE_IO | IORESOURCE_MEM; |
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| 48 | |||
| 49 | for (i = 0; i < PCI_BUS_NUM_RESOURCES; i++) { |
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| 50 | struct resource *r = bus->resource[i]; |
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| 51 | if (!r) |
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| 52 | continue; |
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| 53 | |||
| 54 | /* type_mask must match */ |
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| 55 | if ((res->flags ^ r->flags) & type_mask) |
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| 56 | continue; |
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| 57 | |||
| 58 | /* We cannot allocate a non-prefetching resource |
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| 59 | from a pre-fetching area */ |
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| 60 | if ((r->flags & IORESOURCE_PREFETCH) && |
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| 61 | !(res->flags & IORESOURCE_PREFETCH)) |
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| 62 | continue; |
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| 63 | |||
| 64 | /* Ok, try it out.. */ |
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| 65 | ret = allocate_resource(r, res, size, min, -1, align, |
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| 66 | alignf, alignf_data); |
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| 67 | if (ret == 0) |
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| 68 | break; |
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| 69 | } |
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| 70 | return ret; |
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| 71 | } |
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| 72 | |||
| 73 | /** |
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| 74 | * pci_bus_add_devices - insert newly discovered PCI devices |
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| 75 | * @bus: bus to check for new devices |
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| 76 | * |
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| 77 | * Add newly discovered PCI devices (which are on the bus->devices |
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| 78 | * list) to the global PCI device list, add the sysfs and procfs |
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| 79 | * entries. Where a bridge is found, add the discovered bus to |
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| 80 | * the parents list of child buses, and recurse (breadth-first |
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| 81 | * to be compatible with 2.4) |
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| 82 | * |
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| 83 | * Call hotplug for each new devices. |
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| 84 | */ |
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| 85 | void __devinit pci_bus_add_devices(struct pci_bus *bus) |
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| 86 | { |
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| 87 | struct pci_dev *dev; |
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| 88 | |||
| 89 | list_for_each_entry(dev, &bus->devices, bus_list) { |
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| 90 | /* |
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| 91 | * Skip already-present devices (which are on the |
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| 92 | * global device list.) |
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| 93 | */ |
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| 457 | giacomo | 94 | |
| 95 | if (!list_empty(&dev->global_list)) |
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| 428 | giacomo | 96 | continue; |
| 457 | giacomo | 97 | |
| 428 | giacomo | 98 | device_add(&dev->dev); |
| 99 | |||
| 100 | spin_lock(&pci_bus_lock); |
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| 101 | list_add_tail(&dev->global_list, &pci_devices); |
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| 102 | spin_unlock(&pci_bus_lock); |
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| 103 | |||
| 104 | pci_proc_attach_device(dev); |
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| 105 | |||
| 106 | } |
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| 107 | |||
| 108 | list_for_each_entry(dev, &bus->devices, bus_list) { |
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| 109 | |||
| 110 | BUG_ON(list_empty(&dev->global_list)); |
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| 457 | giacomo | 111 | |
| 428 | giacomo | 112 | /* |
| 113 | * If there is an unattached subordinate bus, attach |
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| 114 | * it and then scan for unattached PCI devices. |
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| 115 | */ |
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| 116 | if (dev->subordinate && list_empty(&dev->subordinate->node)) { |
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| 457 | giacomo | 117 | |
| 118 | spin_lock(&pci_bus_lock); |
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| 428 | giacomo | 119 | list_add_tail(&dev->subordinate->node, &dev->bus->children); |
| 120 | spin_unlock(&pci_bus_lock); |
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| 121 | pci_bus_add_devices(dev->subordinate); |
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| 457 | giacomo | 122 | |
| 428 | giacomo | 123 | } |
| 124 | } |
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| 125 | } |
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| 126 | |||
| 127 | void pci_enable_bridges(struct pci_bus *bus) |
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| 128 | { |
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| 129 | struct pci_dev *dev; |
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| 130 | |||
| 131 | list_for_each_entry(dev, &bus->devices, bus_list) { |
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| 132 | if (dev->subordinate) { |
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| 133 | pci_enable_device(dev); |
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| 134 | pci_set_master(dev); |
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| 135 | pci_enable_bridges(dev->subordinate); |
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| 136 | } |
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| 137 | } |
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| 138 | } |
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| 139 | |||
| 140 | EXPORT_SYMBOL(pci_bus_add_devices); |
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| 141 | EXPORT_SYMBOL(pci_enable_bridges); |