Commit | Line | Data |
---|---|---|
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 | ||
14add80b | 29 | void pci_update_resource(struct pci_dev *dev, int resno) |
1da177e4 LT |
30 | { |
31 | struct pci_bus_region region; | |
32 | u32 new, check, mask; | |
33 | int reg; | |
613e7ed6 | 34 | enum pci_bar_type type; |
14add80b | 35 | struct resource *res = dev->resource + resno; |
1da177e4 | 36 | |
fb0f2b40 RB |
37 | /* |
38 | * Ignore resources for unimplemented BARs and unused resource slots | |
39 | * for 64 bit BARs. | |
40 | */ | |
cf7bee5a IK |
41 | if (!res->flags) |
42 | return; | |
43 | ||
fb0f2b40 RB |
44 | /* |
45 | * Ignore non-moveable resources. This might be legacy resources for | |
46 | * which no functional BAR register exists or another important | |
80ccba11 | 47 | * system resource we shouldn't move around. |
fb0f2b40 RB |
48 | */ |
49 | if (res->flags & IORESOURCE_PCI_FIXED) | |
50 | return; | |
51 | ||
1da177e4 LT |
52 | pcibios_resource_to_bus(dev, ®ion, res); |
53 | ||
1da177e4 LT |
54 | new = region.start | (res->flags & PCI_REGION_FLAG_MASK); |
55 | if (res->flags & IORESOURCE_IO) | |
56 | mask = (u32)PCI_BASE_ADDRESS_IO_MASK; | |
57 | else | |
58 | mask = (u32)PCI_BASE_ADDRESS_MEM_MASK; | |
59 | ||
613e7ed6 YZ |
60 | reg = pci_resource_bar(dev, resno, &type); |
61 | if (!reg) | |
62 | return; | |
63 | if (type != pci_bar_unknown) { | |
755528c8 LT |
64 | if (!(res->flags & IORESOURCE_ROM_ENABLE)) |
65 | return; | |
66 | new |= PCI_ROM_ADDRESS_ENABLE; | |
1da177e4 LT |
67 | } |
68 | ||
69 | pci_write_config_dword(dev, reg, new); | |
70 | pci_read_config_dword(dev, reg, &check); | |
71 | ||
72 | if ((new ^ check) & mask) { | |
80ccba11 BH |
73 | dev_err(&dev->dev, "BAR %d: error updating (%#08x != %#08x)\n", |
74 | resno, new, check); | |
1da177e4 LT |
75 | } |
76 | ||
28c6821a | 77 | if (res->flags & IORESOURCE_MEM_64) { |
cf7bee5a | 78 | new = region.start >> 16 >> 16; |
1da177e4 LT |
79 | pci_write_config_dword(dev, reg + 4, new); |
80 | pci_read_config_dword(dev, reg + 4, &check); | |
81 | if (check != new) { | |
80ccba11 BH |
82 | dev_err(&dev->dev, "BAR %d: error updating " |
83 | "(high %#08x != %#08x)\n", resno, new, check); | |
1da177e4 LT |
84 | } |
85 | } | |
86 | res->flags &= ~IORESOURCE_UNSET; | |
1bcd495b | 87 | dev_info(&dev->dev, "BAR %d: set to %pR (PCI address [%#llx-%#llx])\n", |
865df576 BH |
88 | resno, res, (unsigned long long)region.start, |
89 | (unsigned long long)region.end); | |
1da177e4 LT |
90 | } |
91 | ||
96bde06a | 92 | int pci_claim_resource(struct pci_dev *dev, int resource) |
1da177e4 LT |
93 | { |
94 | struct resource *res = &dev->resource[resource]; | |
966f3a75 | 95 | struct resource *root, *conflict; |
1da177e4 | 96 | |
cebd78a8 | 97 | root = pci_find_parent_resource(dev, res); |
865df576 | 98 | if (!root) { |
f6d440da BH |
99 | dev_info(&dev->dev, "no compatible bridge window for %pR\n", |
100 | res); | |
865df576 | 101 | return -EINVAL; |
1da177e4 LT |
102 | } |
103 | ||
966f3a75 BH |
104 | conflict = request_resource_conflict(root, res); |
105 | if (conflict) { | |
f6d440da BH |
106 | dev_info(&dev->dev, |
107 | "address space collision: %pR conflicts with %s %pR\n", | |
108 | res, conflict->name, conflict); | |
966f3a75 BH |
109 | return -EBUSY; |
110 | } | |
865df576 | 111 | |
966f3a75 | 112 | return 0; |
1da177e4 | 113 | } |
eaa959df | 114 | EXPORT_SYMBOL(pci_claim_resource); |
1da177e4 | 115 | |
32a9a682 YS |
116 | #ifdef CONFIG_PCI_QUIRKS |
117 | void pci_disable_bridge_window(struct pci_dev *dev) | |
118 | { | |
865df576 | 119 | dev_info(&dev->dev, "disabling bridge mem windows\n"); |
32a9a682 YS |
120 | |
121 | /* MMIO Base/Limit */ | |
122 | pci_write_config_dword(dev, PCI_MEMORY_BASE, 0x0000fff0); | |
123 | ||
124 | /* Prefetchable MMIO Base/Limit */ | |
125 | pci_write_config_dword(dev, PCI_PREF_LIMIT_UPPER32, 0); | |
126 | pci_write_config_dword(dev, PCI_PREF_MEMORY_BASE, 0x0000fff0); | |
127 | pci_write_config_dword(dev, PCI_PREF_BASE_UPPER32, 0xffffffff); | |
128 | } | |
129 | #endif /* CONFIG_PCI_QUIRKS */ | |
130 | ||
2bbc6942 RP |
131 | |
132 | ||
d09ee968 | 133 | static int __pci_assign_resource(struct pci_bus *bus, struct pci_dev *dev, |
2bbc6942 | 134 | int resno, resource_size_t size, resource_size_t align) |
1da177e4 | 135 | { |
1da177e4 | 136 | struct resource *res = dev->resource + resno; |
2bbc6942 | 137 | resource_size_t min; |
1da177e4 LT |
138 | int ret; |
139 | ||
1da177e4 | 140 | min = (res->flags & IORESOURCE_IO) ? PCIBIOS_MIN_IO : PCIBIOS_MIN_MEM; |
1da177e4 LT |
141 | |
142 | /* First, try exact prefetching match.. */ | |
143 | ret = pci_bus_alloc_resource(bus, res, size, align, min, | |
144 | IORESOURCE_PREFETCH, | |
145 | pcibios_align_resource, dev); | |
146 | ||
147 | if (ret < 0 && (res->flags & IORESOURCE_PREFETCH)) { | |
148 | /* | |
149 | * That failed. | |
150 | * | |
151 | * But a prefetching area can handle a non-prefetching | |
152 | * window (it will just not perform as well). | |
153 | */ | |
154 | ret = pci_bus_alloc_resource(bus, res, size, align, min, 0, | |
155 | pcibios_align_resource, dev); | |
156 | } | |
2bbc6942 RP |
157 | return ret; |
158 | } | |
1da177e4 | 159 | |
2bbc6942 RP |
160 | static int pci_revert_fw_address(struct resource *res, struct pci_dev *dev, |
161 | int resno, resource_size_t size) | |
162 | { | |
163 | struct resource *root, *conflict; | |
164 | resource_size_t start, end; | |
165 | int ret = 0; | |
58c84eda | 166 | |
2bbc6942 RP |
167 | if (res->flags & IORESOURCE_IO) |
168 | root = &ioport_resource; | |
169 | else | |
170 | root = &iomem_resource; | |
171 | ||
172 | start = res->start; | |
173 | end = res->end; | |
174 | res->start = dev->fw_addr[resno]; | |
175 | res->end = res->start + size - 1; | |
176 | dev_info(&dev->dev, "BAR %d: trying firmware assignment %pR\n", | |
177 | resno, res); | |
178 | conflict = request_resource_conflict(root, res); | |
179 | if (conflict) { | |
180 | dev_info(&dev->dev, | |
181 | "BAR %d: %pR conflicts with %s %pR\n", resno, | |
182 | res, conflict->name, conflict); | |
183 | res->start = start; | |
184 | res->end = end; | |
185 | ret = 1; | |
186 | } | |
187 | return ret; | |
188 | } | |
189 | ||
190 | static int _pci_assign_resource(struct pci_dev *dev, int resno, int size, resource_size_t min_align) | |
191 | { | |
192 | struct resource *res = dev->resource + resno; | |
193 | struct pci_bus *bus; | |
194 | int ret; | |
195 | char *type; | |
58c84eda | 196 | |
2bbc6942 RP |
197 | bus = dev->bus; |
198 | while ((ret = __pci_assign_resource(bus, dev, resno, size, min_align))) { | |
199 | if (!bus->parent || !bus->self->transparent) | |
200 | break; | |
201 | bus = bus->parent; | |
202 | } | |
203 | ||
204 | if (ret) { | |
205 | if (res->flags & IORESOURCE_MEM) | |
206 | if (res->flags & IORESOURCE_PREFETCH) | |
207 | type = "mem pref"; | |
208 | else | |
209 | type = "mem"; | |
210 | else if (res->flags & IORESOURCE_IO) | |
211 | type = "io"; | |
58c84eda | 212 | else |
2bbc6942 RP |
213 | type = "unknown"; |
214 | dev_info(&dev->dev, | |
215 | "BAR %d: can't assign %s (size %#llx)\n", | |
216 | resno, type, (unsigned long long) resource_size(res)); | |
58c84eda BH |
217 | } |
218 | ||
2bbc6942 RP |
219 | return ret; |
220 | } | |
221 | ||
222 | int pci_reassign_resource(struct pci_dev *dev, int resno, resource_size_t addsize, | |
223 | resource_size_t min_align) | |
224 | { | |
225 | struct resource *res = dev->resource + resno; | |
226 | resource_size_t new_size; | |
227 | int ret; | |
228 | ||
229 | if (!res->parent) { | |
230 | dev_info(&dev->dev, "BAR %d: can't reassign an unassigned resouce %pR " | |
231 | "\n", resno, res); | |
232 | return -EINVAL; | |
233 | } | |
234 | ||
235 | new_size = resource_size(res) + addsize + min_align; | |
236 | ret = _pci_assign_resource(dev, resno, new_size, min_align); | |
d09ee968 | 237 | if (!ret) { |
88452565 | 238 | res->flags &= ~IORESOURCE_STARTALIGN; |
865df576 | 239 | dev_info(&dev->dev, "BAR %d: assigned %pR\n", resno, res); |
88452565 | 240 | if (resno < PCI_BRIDGE_RESOURCES) |
14add80b | 241 | pci_update_resource(dev, resno); |
1da177e4 | 242 | } |
1da177e4 LT |
243 | return ret; |
244 | } | |
245 | ||
d09ee968 YL |
246 | int pci_assign_resource(struct pci_dev *dev, int resno) |
247 | { | |
248 | struct resource *res = dev->resource + resno; | |
2bbc6942 | 249 | resource_size_t align, size; |
d09ee968 YL |
250 | struct pci_bus *bus; |
251 | int ret; | |
252 | ||
6faf17f6 | 253 | align = pci_resource_alignment(dev, res); |
d09ee968 | 254 | if (!align) { |
865df576 | 255 | dev_info(&dev->dev, "BAR %d: can't assign %pR " |
a369c791 | 256 | "(bogus alignment)\n", resno, res); |
d09ee968 YL |
257 | return -EINVAL; |
258 | } | |
259 | ||
260 | bus = dev->bus; | |
2bbc6942 RP |
261 | size = resource_size(res); |
262 | ret = _pci_assign_resource(dev, resno, size, align); | |
d09ee968 | 263 | |
2bbc6942 RP |
264 | /* |
265 | * If we failed to assign anything, let's try the address | |
266 | * where firmware left it. That at least has a chance of | |
267 | * working, which is better than just leaving it disabled. | |
268 | */ | |
269 | if (ret < 0 && dev->fw_addr[resno]) | |
270 | ret = pci_revert_fw_address(res, dev, resno, size); | |
d09ee968 | 271 | |
2bbc6942 RP |
272 | if (!ret) { |
273 | res->flags &= ~IORESOURCE_STARTALIGN; | |
274 | dev_info(&dev->dev, "BAR %d: assigned %pR\n", resno, res); | |
275 | if (resno < PCI_BRIDGE_RESOURCES) | |
276 | pci_update_resource(dev, resno); | |
277 | } | |
d09ee968 YL |
278 | return ret; |
279 | } | |
280 | ||
2bbc6942 | 281 | |
1da177e4 | 282 | /* Sort resources by alignment */ |
96bde06a | 283 | void pdev_sort_resources(struct pci_dev *dev, struct resource_list *head) |
1da177e4 LT |
284 | { |
285 | int i; | |
286 | ||
287 | for (i = 0; i < PCI_NUM_RESOURCES; i++) { | |
288 | struct resource *r; | |
289 | struct resource_list *list, *tmp; | |
e31dd6e4 | 290 | resource_size_t r_align; |
1da177e4 LT |
291 | |
292 | r = &dev->resource[i]; | |
fb0f2b40 RB |
293 | |
294 | if (r->flags & IORESOURCE_PCI_FIXED) | |
295 | continue; | |
296 | ||
1da177e4 LT |
297 | if (!(r->flags) || r->parent) |
298 | continue; | |
88452565 | 299 | |
6faf17f6 | 300 | r_align = pci_resource_alignment(dev, r); |
1da177e4 | 301 | if (!r_align) { |
c7dabef8 | 302 | dev_warn(&dev->dev, "BAR %d: %pR has bogus alignment\n", |
a369c791 | 303 | i, r); |
1da177e4 LT |
304 | continue; |
305 | } | |
1da177e4 | 306 | for (list = head; ; list = list->next) { |
e31dd6e4 | 307 | resource_size_t align = 0; |
1da177e4 | 308 | struct resource_list *ln = list->next; |
88452565 IK |
309 | |
310 | if (ln) | |
6faf17f6 | 311 | align = pci_resource_alignment(ln->dev, ln->res); |
88452565 | 312 | |
1da177e4 LT |
313 | if (r_align > align) { |
314 | tmp = kmalloc(sizeof(*tmp), GFP_KERNEL); | |
315 | if (!tmp) | |
316 | panic("pdev_sort_resources(): " | |
317 | "kmalloc() failed!\n"); | |
318 | tmp->next = ln; | |
319 | tmp->res = r; | |
320 | tmp->dev = dev; | |
321 | list->next = tmp; | |
322 | break; | |
323 | } | |
324 | } | |
325 | } | |
326 | } | |
842de40d BH |
327 | |
328 | int pci_enable_resources(struct pci_dev *dev, int mask) | |
329 | { | |
330 | u16 cmd, old_cmd; | |
331 | int i; | |
332 | struct resource *r; | |
333 | ||
334 | pci_read_config_word(dev, PCI_COMMAND, &cmd); | |
335 | old_cmd = cmd; | |
336 | ||
337 | for (i = 0; i < PCI_NUM_RESOURCES; i++) { | |
338 | if (!(mask & (1 << i))) | |
339 | continue; | |
340 | ||
341 | r = &dev->resource[i]; | |
342 | ||
343 | if (!(r->flags & (IORESOURCE_IO | IORESOURCE_MEM))) | |
344 | continue; | |
345 | if ((i == PCI_ROM_RESOURCE) && | |
346 | (!(r->flags & IORESOURCE_ROM_ENABLE))) | |
347 | continue; | |
348 | ||
349 | if (!r->parent) { | |
865df576 BH |
350 | dev_err(&dev->dev, "device not available " |
351 | "(can't reserve %pR)\n", r); | |
842de40d BH |
352 | return -EINVAL; |
353 | } | |
354 | ||
355 | if (r->flags & IORESOURCE_IO) | |
356 | cmd |= PCI_COMMAND_IO; | |
357 | if (r->flags & IORESOURCE_MEM) | |
358 | cmd |= PCI_COMMAND_MEMORY; | |
359 | } | |
360 | ||
361 | if (cmd != old_cmd) { | |
362 | dev_info(&dev->dev, "enabling device (%04x -> %04x)\n", | |
363 | old_cmd, cmd); | |
364 | pci_write_config_word(dev, PCI_COMMAND, cmd); | |
365 | } | |
366 | return 0; | |
367 | } |