2 * drivers/pci/setup-res.c
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)
9 * Support routines for initializing a PCI subsystem.
12 /* fixed for multiple pci buses, 1999 Andrea Arcangeli <andrea@suse.de> */
15 * Nov 2000, Ivan Kokshaysky <ink@jurassic.park.msu.ru>
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>
30 pci_update_resource(struct pci_dev
*dev
, struct resource
*res
, int resno
)
32 struct pci_bus_region region
;
37 * Ignore resources for unimplemented BARs and unused resource slots
44 * Ignore non-moveable resources. This might be legacy resources for
45 * which no functional BAR register exists or another important
46 * system resource we should better not move around in system address
49 if (res
->flags
& IORESOURCE_PCI_FIXED
)
52 pcibios_resource_to_bus(dev
, ®ion
, res
);
54 pr_debug(" got res [%llx:%llx] bus [%lx:%lx] flags %lx for "
55 "BAR %d of %s\n", (unsigned long long)res
->start
,
56 (unsigned long long)res
->end
,
57 region
.start
, region
.end
, res
->flags
, resno
, pci_name(dev
));
59 new = region
.start
| (res
->flags
& PCI_REGION_FLAG_MASK
);
60 if (res
->flags
& IORESOURCE_IO
)
61 mask
= (u32
)PCI_BASE_ADDRESS_IO_MASK
;
63 mask
= (u32
)PCI_BASE_ADDRESS_MEM_MASK
;
66 reg
= PCI_BASE_ADDRESS_0
+ 4 * resno
;
67 } else if (resno
== PCI_ROM_RESOURCE
) {
68 if (!(res
->flags
& IORESOURCE_ROM_ENABLE
))
70 new |= PCI_ROM_ADDRESS_ENABLE
;
71 reg
= dev
->rom_base_reg
;
73 /* Hmm, non-standard resource. */
75 return; /* kill uninitialised var warning */
78 pci_write_config_dword(dev
, reg
, new);
79 pci_read_config_dword(dev
, reg
, &check
);
81 if ((new ^ check
) & mask
) {
82 printk(KERN_ERR
"PCI: Error while updating region "
83 "%s/%d (%08x != %08x)\n", pci_name(dev
), resno
,
87 if ((new & (PCI_BASE_ADDRESS_SPACE
|PCI_BASE_ADDRESS_MEM_TYPE_MASK
)) ==
88 (PCI_BASE_ADDRESS_SPACE_MEMORY
|PCI_BASE_ADDRESS_MEM_TYPE_64
)) {
89 new = region
.start
>> 16 >> 16;
90 pci_write_config_dword(dev
, reg
+ 4, new);
91 pci_read_config_dword(dev
, reg
+ 4, &check
);
93 printk(KERN_ERR
"PCI: Error updating region "
94 "%s/%d (high %08x != %08x)\n",
95 pci_name(dev
), resno
, new, check
);
98 res
->flags
&= ~IORESOURCE_UNSET
;
99 pr_debug("PCI: moved device %s resource %d (%lx) to %x\n",
100 pci_name(dev
), resno
, res
->flags
,
101 new & ~PCI_REGION_FLAG_MASK
);
105 pci_claim_resource(struct pci_dev
*dev
, int resource
)
107 struct resource
*res
= &dev
->resource
[resource
];
108 struct resource
*root
= NULL
;
109 char *dtype
= resource
< PCI_BRIDGE_RESOURCES
? "device" : "bridge";
112 root
= pcibios_select_root(dev
, res
);
116 err
= insert_resource(root
, res
);
119 printk(KERN_ERR
"PCI: %s region %d of %s %s [%llx:%llx]\n",
120 root
? "Address space collision on" :
121 "No parent found for",
122 resource
, dtype
, pci_name(dev
),
123 (unsigned long long)res
->start
,
124 (unsigned long long)res
->end
);
129 EXPORT_SYMBOL_GPL(pci_claim_resource
);
131 int pci_assign_resource(struct pci_dev
*dev
, int resno
)
133 struct pci_bus
*bus
= dev
->bus
;
134 struct resource
*res
= dev
->resource
+ resno
;
135 resource_size_t size
, min
, align
;
138 size
= res
->end
- res
->start
+ 1;
139 min
= (res
->flags
& IORESOURCE_IO
) ? PCIBIOS_MIN_IO
: PCIBIOS_MIN_MEM
;
140 /* The bridge resources are special, as their
141 size != alignment. Sizing routines return
142 required alignment in the "start" field. */
143 align
= (resno
< PCI_BRIDGE_RESOURCES
) ? size
: res
->start
;
145 /* First, try exact prefetching match.. */
146 ret
= pci_bus_alloc_resource(bus
, res
, size
, align
, min
,
148 pcibios_align_resource
, dev
);
150 if (ret
< 0 && (res
->flags
& IORESOURCE_PREFETCH
)) {
154 * But a prefetching area can handle a non-prefetching
155 * window (it will just not perform as well).
157 ret
= pci_bus_alloc_resource(bus
, res
, size
, align
, min
, 0,
158 pcibios_align_resource
, dev
);
162 printk(KERN_ERR
"PCI: Failed to allocate %s resource "
163 "#%d:%llx@%llx for %s\n",
164 res
->flags
& IORESOURCE_IO
? "I/O" : "mem",
165 resno
, (unsigned long long)size
,
166 (unsigned long long)res
->start
, pci_name(dev
));
167 } else if (resno
< PCI_BRIDGE_RESOURCES
) {
168 pci_update_resource(dev
, res
, resno
);
174 #ifdef CONFIG_EMBEDDED
175 int pci_assign_resource_fixed(struct pci_dev
*dev
, int resno
)
177 struct pci_bus
*bus
= dev
->bus
;
178 struct resource
*res
= dev
->resource
+ resno
;
179 unsigned int type_mask
;
182 type_mask
= IORESOURCE_IO
| IORESOURCE_MEM
| IORESOURCE_PREFETCH
;
184 for (i
= 0; i
< PCI_BUS_NUM_RESOURCES
; i
++) {
185 struct resource
*r
= bus
->resource
[i
];
189 /* type_mask must match */
190 if ((res
->flags
^ r
->flags
) & type_mask
)
193 ret
= request_resource(r
, res
);
200 printk(KERN_ERR
"PCI: Failed to allocate %s resource "
201 "#%d:%llx@%llx for %s\n",
202 res
->flags
& IORESOURCE_IO
? "I/O" : "mem",
203 resno
, (unsigned long long)(res
->end
- res
->start
+ 1),
204 (unsigned long long)res
->start
, pci_name(dev
));
205 } else if (resno
< PCI_BRIDGE_RESOURCES
) {
206 pci_update_resource(dev
, res
, resno
);
211 EXPORT_SYMBOL_GPL(pci_assign_resource_fixed
);
214 /* Sort resources by alignment */
216 pdev_sort_resources(struct pci_dev
*dev
, struct resource_list
*head
)
220 for (i
= 0; i
< PCI_NUM_RESOURCES
; i
++) {
222 struct resource_list
*list
, *tmp
;
223 resource_size_t r_align
;
225 r
= &dev
->resource
[i
];
227 if (r
->flags
& IORESOURCE_PCI_FIXED
)
230 r_align
= r
->end
- r
->start
;
232 if (!(r
->flags
) || r
->parent
)
235 printk(KERN_WARNING
"PCI: Ignore bogus resource %d "
236 "[%llx:%llx] of %s\n",
237 i
, (unsigned long long)r
->start
,
238 (unsigned long long)r
->end
, pci_name(dev
));
241 r_align
= (i
< PCI_BRIDGE_RESOURCES
) ? r_align
+ 1 : r
->start
;
242 for (list
= head
; ; list
= list
->next
) {
243 resource_size_t align
= 0;
244 struct resource_list
*ln
= list
->next
;
248 idx
= ln
->res
- &ln
->dev
->resource
[0];
249 align
= (idx
< PCI_BRIDGE_RESOURCES
) ?
250 ln
->res
->end
- ln
->res
->start
+ 1 :
253 if (r_align
> align
) {
254 tmp
= kmalloc(sizeof(*tmp
), GFP_KERNEL
);
256 panic("pdev_sort_resources(): "
257 "kmalloc() failed!\n");