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1da177e4 LT |
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.. */ | |
688d1918 LT |
63 | ret = allocate_resource(r, res, size, |
64 | r->start ? : min, | |
65 | -1, align, | |
1da177e4 LT |
66 | alignf, alignf_data); |
67 | if (ret == 0) | |
68 | break; | |
69 | } | |
70 | return ret; | |
71 | } | |
72 | ||
73 | /** | |
74 | * add a single device | |
75 | * @dev: device to add | |
76 | * | |
77 | * This adds a single pci device to the global | |
78 | * device list and adds sysfs and procfs entries | |
79 | */ | |
80 | void __devinit pci_bus_add_device(struct pci_dev *dev) | |
81 | { | |
82 | device_add(&dev->dev); | |
83 | ||
84 | spin_lock(&pci_bus_lock); | |
85 | list_add_tail(&dev->global_list, &pci_devices); | |
86 | spin_unlock(&pci_bus_lock); | |
87 | ||
88 | pci_proc_attach_device(dev); | |
89 | pci_create_sysfs_dev_files(dev); | |
90 | } | |
91 | ||
92 | /** | |
93 | * pci_bus_add_devices - insert newly discovered PCI devices | |
94 | * @bus: bus to check for new devices | |
95 | * | |
96 | * Add newly discovered PCI devices (which are on the bus->devices | |
97 | * list) to the global PCI device list, add the sysfs and procfs | |
98 | * entries. Where a bridge is found, add the discovered bus to | |
99 | * the parents list of child buses, and recurse (breadth-first | |
100 | * to be compatible with 2.4) | |
101 | * | |
102 | * Call hotplug for each new devices. | |
103 | */ | |
104 | void __devinit pci_bus_add_devices(struct pci_bus *bus) | |
105 | { | |
106 | struct pci_dev *dev; | |
107 | ||
108 | list_for_each_entry(dev, &bus->devices, bus_list) { | |
109 | /* | |
110 | * Skip already-present devices (which are on the | |
111 | * global device list.) | |
112 | */ | |
113 | if (!list_empty(&dev->global_list)) | |
114 | continue; | |
115 | pci_bus_add_device(dev); | |
116 | } | |
117 | ||
118 | list_for_each_entry(dev, &bus->devices, bus_list) { | |
119 | ||
120 | BUG_ON(list_empty(&dev->global_list)); | |
121 | ||
122 | /* | |
123 | * If there is an unattached subordinate bus, attach | |
124 | * it and then scan for unattached PCI devices. | |
125 | */ | |
6ef6f0e3 RS |
126 | if (dev->subordinate) { |
127 | if (list_empty(&dev->subordinate->node)) { | |
128 | spin_lock(&pci_bus_lock); | |
129 | list_add_tail(&dev->subordinate->node, | |
130 | &dev->bus->children); | |
131 | spin_unlock(&pci_bus_lock); | |
132 | } | |
1da177e4 LT |
133 | pci_bus_add_devices(dev->subordinate); |
134 | ||
135 | sysfs_create_link(&dev->subordinate->class_dev.kobj, &dev->dev.kobj, "bridge"); | |
136 | } | |
137 | } | |
138 | } | |
139 | ||
140 | void pci_enable_bridges(struct pci_bus *bus) | |
141 | { | |
142 | struct pci_dev *dev; | |
95a62965 | 143 | int retval; |
1da177e4 LT |
144 | |
145 | list_for_each_entry(dev, &bus->devices, bus_list) { | |
146 | if (dev->subordinate) { | |
95a62965 | 147 | retval = pci_enable_device(dev); |
1da177e4 LT |
148 | pci_set_master(dev); |
149 | pci_enable_bridges(dev->subordinate); | |
150 | } | |
151 | } | |
152 | } | |
153 | ||
154 | EXPORT_SYMBOL(pci_bus_alloc_resource); | |
155 | EXPORT_SYMBOL_GPL(pci_bus_add_device); | |
156 | EXPORT_SYMBOL(pci_bus_add_devices); | |
157 | EXPORT_SYMBOL(pci_enable_bridges); |