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1da177e4 LT |
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 | ||
fec59a71 | 29 | void |
1da177e4 LT |
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 | } |