Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * drivers/pci/setup-bus.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 | /* | |
13 | * Nov 2000, Ivan Kokshaysky <ink@jurassic.park.msu.ru> | |
14 | * PCI-PCI bridges cleanup, sorted resource allocation. | |
15 | * Feb 2002, Ivan Kokshaysky <ink@jurassic.park.msu.ru> | |
16 | * Converted to allocation in 3 passes, which gives | |
17 | * tighter packing. Prefetchable range support. | |
18 | */ | |
19 | ||
20 | #include <linux/init.h> | |
21 | #include <linux/kernel.h> | |
22 | #include <linux/module.h> | |
23 | #include <linux/pci.h> | |
24 | #include <linux/errno.h> | |
25 | #include <linux/ioport.h> | |
26 | #include <linux/cache.h> | |
27 | #include <linux/slab.h> | |
6faf17f6 | 28 | #include "pci.h" |
1da177e4 | 29 | |
568ddef8 YL |
30 | struct resource_list_x { |
31 | struct resource_list_x *next; | |
32 | struct resource *res; | |
33 | struct pci_dev *dev; | |
34 | resource_size_t start; | |
35 | resource_size_t end; | |
36 | unsigned long flags; | |
37 | }; | |
38 | ||
39 | static void add_to_failed_list(struct resource_list_x *head, | |
40 | struct pci_dev *dev, struct resource *res) | |
41 | { | |
42 | struct resource_list_x *list = head; | |
43 | struct resource_list_x *ln = list->next; | |
44 | struct resource_list_x *tmp; | |
45 | ||
46 | tmp = kmalloc(sizeof(*tmp), GFP_KERNEL); | |
47 | if (!tmp) { | |
48 | pr_warning("add_to_failed_list: kmalloc() failed!\n"); | |
49 | return; | |
50 | } | |
51 | ||
52 | tmp->next = ln; | |
53 | tmp->res = res; | |
54 | tmp->dev = dev; | |
55 | tmp->start = res->start; | |
56 | tmp->end = res->end; | |
57 | tmp->flags = res->flags; | |
58 | list->next = tmp; | |
59 | } | |
60 | ||
61 | static void free_failed_list(struct resource_list_x *head) | |
62 | { | |
63 | struct resource_list_x *list, *tmp; | |
64 | ||
65 | for (list = head->next; list;) { | |
66 | tmp = list; | |
67 | list = list->next; | |
68 | kfree(tmp); | |
69 | } | |
70 | ||
71 | head->next = NULL; | |
72 | } | |
73 | ||
6841ec68 YL |
74 | static void __dev_sort_resources(struct pci_dev *dev, |
75 | struct resource_list *head) | |
1da177e4 | 76 | { |
6841ec68 | 77 | u16 class = dev->class >> 8; |
1da177e4 | 78 | |
6841ec68 YL |
79 | /* Don't touch classless devices or host bridges or ioapics. */ |
80 | if (class == PCI_CLASS_NOT_DEFINED || class == PCI_CLASS_BRIDGE_HOST) | |
81 | return; | |
1da177e4 | 82 | |
6841ec68 YL |
83 | /* Don't touch ioapic devices already enabled by firmware */ |
84 | if (class == PCI_CLASS_SYSTEM_PIC) { | |
85 | u16 command; | |
86 | pci_read_config_word(dev, PCI_COMMAND, &command); | |
87 | if (command & (PCI_COMMAND_IO | PCI_COMMAND_MEMORY)) | |
88 | return; | |
89 | } | |
1da177e4 | 90 | |
6841ec68 YL |
91 | pdev_sort_resources(dev, head); |
92 | } | |
23186279 | 93 | |
6841ec68 YL |
94 | static void __assign_resources_sorted(struct resource_list *head, |
95 | struct resource_list_x *fail_head) | |
96 | { | |
97 | struct resource *res; | |
98 | struct resource_list *list, *tmp; | |
99 | int idx; | |
1da177e4 | 100 | |
6841ec68 | 101 | for (list = head->next; list;) { |
1da177e4 LT |
102 | res = list->res; |
103 | idx = res - &list->dev->resource[0]; | |
9a928660 | 104 | |
542df5de | 105 | if (pci_assign_resource(list->dev, idx)) { |
9a928660 YL |
106 | if (fail_head && !pci_is_root_bus(list->dev->bus)) { |
107 | /* | |
108 | * if the failed res is for ROM BAR, and it will | |
109 | * be enabled later, don't add it to the list | |
110 | */ | |
111 | if (!((idx == PCI_ROM_RESOURCE) && | |
112 | (!(res->flags & IORESOURCE_ROM_ENABLE)))) | |
113 | add_to_failed_list(fail_head, list->dev, res); | |
114 | } | |
542df5de | 115 | res->start = 0; |
960b8466 | 116 | res->end = 0; |
542df5de RS |
117 | res->flags = 0; |
118 | } | |
1da177e4 LT |
119 | tmp = list; |
120 | list = list->next; | |
121 | kfree(tmp); | |
122 | } | |
123 | } | |
124 | ||
6841ec68 YL |
125 | static void pdev_assign_resources_sorted(struct pci_dev *dev, |
126 | struct resource_list_x *fail_head) | |
127 | { | |
128 | struct resource_list head; | |
129 | ||
130 | head.next = NULL; | |
131 | __dev_sort_resources(dev, &head); | |
132 | __assign_resources_sorted(&head, fail_head); | |
133 | ||
134 | } | |
135 | ||
136 | static void pbus_assign_resources_sorted(const struct pci_bus *bus, | |
137 | struct resource_list_x *fail_head) | |
138 | { | |
139 | struct pci_dev *dev; | |
140 | struct resource_list head; | |
141 | ||
142 | head.next = NULL; | |
143 | list_for_each_entry(dev, &bus->devices, bus_list) | |
144 | __dev_sort_resources(dev, &head); | |
145 | ||
146 | __assign_resources_sorted(&head, fail_head); | |
147 | } | |
148 | ||
b3743fa4 | 149 | void pci_setup_cardbus(struct pci_bus *bus) |
1da177e4 LT |
150 | { |
151 | struct pci_dev *bridge = bus->self; | |
c7dabef8 | 152 | struct resource *res; |
1da177e4 LT |
153 | struct pci_bus_region region; |
154 | ||
865df576 BH |
155 | dev_info(&bridge->dev, "CardBus bridge to [bus %02x-%02x]\n", |
156 | bus->secondary, bus->subordinate); | |
1da177e4 | 157 | |
c7dabef8 BH |
158 | res = bus->resource[0]; |
159 | pcibios_resource_to_bus(bridge, ®ion, res); | |
160 | if (res->flags & IORESOURCE_IO) { | |
1da177e4 LT |
161 | /* |
162 | * The IO resource is allocated a range twice as large as it | |
163 | * would normally need. This allows us to set both IO regs. | |
164 | */ | |
c7dabef8 | 165 | dev_info(&bridge->dev, " bridge window %pR\n", res); |
1da177e4 LT |
166 | pci_write_config_dword(bridge, PCI_CB_IO_BASE_0, |
167 | region.start); | |
168 | pci_write_config_dword(bridge, PCI_CB_IO_LIMIT_0, | |
169 | region.end); | |
170 | } | |
171 | ||
c7dabef8 BH |
172 | res = bus->resource[1]; |
173 | pcibios_resource_to_bus(bridge, ®ion, res); | |
174 | if (res->flags & IORESOURCE_IO) { | |
175 | dev_info(&bridge->dev, " bridge window %pR\n", res); | |
1da177e4 LT |
176 | pci_write_config_dword(bridge, PCI_CB_IO_BASE_1, |
177 | region.start); | |
178 | pci_write_config_dword(bridge, PCI_CB_IO_LIMIT_1, | |
179 | region.end); | |
180 | } | |
181 | ||
c7dabef8 BH |
182 | res = bus->resource[2]; |
183 | pcibios_resource_to_bus(bridge, ®ion, res); | |
184 | if (res->flags & IORESOURCE_MEM) { | |
185 | dev_info(&bridge->dev, " bridge window %pR\n", res); | |
1da177e4 LT |
186 | pci_write_config_dword(bridge, PCI_CB_MEMORY_BASE_0, |
187 | region.start); | |
188 | pci_write_config_dword(bridge, PCI_CB_MEMORY_LIMIT_0, | |
189 | region.end); | |
190 | } | |
191 | ||
c7dabef8 BH |
192 | res = bus->resource[3]; |
193 | pcibios_resource_to_bus(bridge, ®ion, res); | |
194 | if (res->flags & IORESOURCE_MEM) { | |
195 | dev_info(&bridge->dev, " bridge window %pR\n", res); | |
1da177e4 LT |
196 | pci_write_config_dword(bridge, PCI_CB_MEMORY_BASE_1, |
197 | region.start); | |
198 | pci_write_config_dword(bridge, PCI_CB_MEMORY_LIMIT_1, | |
199 | region.end); | |
200 | } | |
201 | } | |
b3743fa4 | 202 | EXPORT_SYMBOL(pci_setup_cardbus); |
1da177e4 LT |
203 | |
204 | /* Initialize bridges with base/limit values we have collected. | |
205 | PCI-to-PCI Bridge Architecture Specification rev. 1.1 (1998) | |
206 | requires that if there is no I/O ports or memory behind the | |
207 | bridge, corresponding range must be turned off by writing base | |
208 | value greater than limit to the bridge's base/limit registers. | |
209 | ||
210 | Note: care must be taken when updating I/O base/limit registers | |
211 | of bridges which support 32-bit I/O. This update requires two | |
212 | config space writes, so it's quite possible that an I/O window of | |
213 | the bridge will have some undesirable address (e.g. 0) after the | |
214 | first write. Ditto 64-bit prefetchable MMIO. */ | |
7cc5997d | 215 | static void pci_setup_bridge_io(struct pci_bus *bus) |
1da177e4 LT |
216 | { |
217 | struct pci_dev *bridge = bus->self; | |
c7dabef8 | 218 | struct resource *res; |
1da177e4 | 219 | struct pci_bus_region region; |
7cc5997d | 220 | u32 l, io_upper16; |
1da177e4 LT |
221 | |
222 | /* Set up the top and bottom of the PCI I/O segment for this bus. */ | |
c7dabef8 BH |
223 | res = bus->resource[0]; |
224 | pcibios_resource_to_bus(bridge, ®ion, res); | |
225 | if (res->flags & IORESOURCE_IO) { | |
1da177e4 LT |
226 | pci_read_config_dword(bridge, PCI_IO_BASE, &l); |
227 | l &= 0xffff0000; | |
228 | l |= (region.start >> 8) & 0x00f0; | |
229 | l |= region.end & 0xf000; | |
230 | /* Set up upper 16 bits of I/O base/limit. */ | |
231 | io_upper16 = (region.end & 0xffff0000) | (region.start >> 16); | |
c7dabef8 | 232 | dev_info(&bridge->dev, " bridge window %pR\n", res); |
7cc5997d | 233 | } else { |
1da177e4 LT |
234 | /* Clear upper 16 bits of I/O base/limit. */ |
235 | io_upper16 = 0; | |
236 | l = 0x00f0; | |
c7dabef8 | 237 | dev_info(&bridge->dev, " bridge window [io disabled]\n"); |
1da177e4 LT |
238 | } |
239 | /* Temporarily disable the I/O range before updating PCI_IO_BASE. */ | |
240 | pci_write_config_dword(bridge, PCI_IO_BASE_UPPER16, 0x0000ffff); | |
241 | /* Update lower 16 bits of I/O base/limit. */ | |
242 | pci_write_config_dword(bridge, PCI_IO_BASE, l); | |
243 | /* Update upper 16 bits of I/O base/limit. */ | |
244 | pci_write_config_dword(bridge, PCI_IO_BASE_UPPER16, io_upper16); | |
7cc5997d YL |
245 | } |
246 | ||
247 | static void pci_setup_bridge_mmio(struct pci_bus *bus) | |
248 | { | |
249 | struct pci_dev *bridge = bus->self; | |
250 | struct resource *res; | |
251 | struct pci_bus_region region; | |
252 | u32 l; | |
1da177e4 | 253 | |
7cc5997d | 254 | /* Set up the top and bottom of the PCI Memory segment for this bus. */ |
c7dabef8 BH |
255 | res = bus->resource[1]; |
256 | pcibios_resource_to_bus(bridge, ®ion, res); | |
257 | if (res->flags & IORESOURCE_MEM) { | |
1da177e4 LT |
258 | l = (region.start >> 16) & 0xfff0; |
259 | l |= region.end & 0xfff00000; | |
c7dabef8 | 260 | dev_info(&bridge->dev, " bridge window %pR\n", res); |
7cc5997d | 261 | } else { |
1da177e4 | 262 | l = 0x0000fff0; |
c7dabef8 | 263 | dev_info(&bridge->dev, " bridge window [mem disabled]\n"); |
1da177e4 LT |
264 | } |
265 | pci_write_config_dword(bridge, PCI_MEMORY_BASE, l); | |
7cc5997d YL |
266 | } |
267 | ||
268 | static void pci_setup_bridge_mmio_pref(struct pci_bus *bus) | |
269 | { | |
270 | struct pci_dev *bridge = bus->self; | |
271 | struct resource *res; | |
272 | struct pci_bus_region region; | |
273 | u32 l, bu, lu; | |
1da177e4 LT |
274 | |
275 | /* Clear out the upper 32 bits of PREF limit. | |
276 | If PCI_PREF_BASE_UPPER32 was non-zero, this temporarily | |
277 | disables PREF range, which is ok. */ | |
278 | pci_write_config_dword(bridge, PCI_PREF_LIMIT_UPPER32, 0); | |
279 | ||
280 | /* Set up PREF base/limit. */ | |
c40a22e0 | 281 | bu = lu = 0; |
c7dabef8 BH |
282 | res = bus->resource[2]; |
283 | pcibios_resource_to_bus(bridge, ®ion, res); | |
284 | if (res->flags & IORESOURCE_PREFETCH) { | |
1da177e4 LT |
285 | l = (region.start >> 16) & 0xfff0; |
286 | l |= region.end & 0xfff00000; | |
c7dabef8 | 287 | if (res->flags & IORESOURCE_MEM_64) { |
1f82de10 YL |
288 | bu = upper_32_bits(region.start); |
289 | lu = upper_32_bits(region.end); | |
1f82de10 | 290 | } |
c7dabef8 | 291 | dev_info(&bridge->dev, " bridge window %pR\n", res); |
7cc5997d | 292 | } else { |
1da177e4 | 293 | l = 0x0000fff0; |
c7dabef8 | 294 | dev_info(&bridge->dev, " bridge window [mem pref disabled]\n"); |
1da177e4 LT |
295 | } |
296 | pci_write_config_dword(bridge, PCI_PREF_MEMORY_BASE, l); | |
297 | ||
59353ea3 AW |
298 | /* Set the upper 32 bits of PREF base & limit. */ |
299 | pci_write_config_dword(bridge, PCI_PREF_BASE_UPPER32, bu); | |
300 | pci_write_config_dword(bridge, PCI_PREF_LIMIT_UPPER32, lu); | |
7cc5997d YL |
301 | } |
302 | ||
303 | static void __pci_setup_bridge(struct pci_bus *bus, unsigned long type) | |
304 | { | |
305 | struct pci_dev *bridge = bus->self; | |
306 | ||
7cc5997d YL |
307 | dev_info(&bridge->dev, "PCI bridge to [bus %02x-%02x]\n", |
308 | bus->secondary, bus->subordinate); | |
309 | ||
310 | if (type & IORESOURCE_IO) | |
311 | pci_setup_bridge_io(bus); | |
312 | ||
313 | if (type & IORESOURCE_MEM) | |
314 | pci_setup_bridge_mmio(bus); | |
315 | ||
316 | if (type & IORESOURCE_PREFETCH) | |
317 | pci_setup_bridge_mmio_pref(bus); | |
1da177e4 LT |
318 | |
319 | pci_write_config_word(bridge, PCI_BRIDGE_CONTROL, bus->bridge_ctl); | |
320 | } | |
321 | ||
7cc5997d YL |
322 | static void pci_setup_bridge(struct pci_bus *bus) |
323 | { | |
324 | unsigned long type = IORESOURCE_IO | IORESOURCE_MEM | | |
325 | IORESOURCE_PREFETCH; | |
326 | ||
327 | __pci_setup_bridge(bus, type); | |
328 | } | |
329 | ||
1da177e4 LT |
330 | /* Check whether the bridge supports optional I/O and |
331 | prefetchable memory ranges. If not, the respective | |
332 | base/limit registers must be read-only and read as 0. */ | |
96bde06a | 333 | static void pci_bridge_check_ranges(struct pci_bus *bus) |
1da177e4 LT |
334 | { |
335 | u16 io; | |
336 | u32 pmem; | |
337 | struct pci_dev *bridge = bus->self; | |
338 | struct resource *b_res; | |
339 | ||
340 | b_res = &bridge->resource[PCI_BRIDGE_RESOURCES]; | |
341 | b_res[1].flags |= IORESOURCE_MEM; | |
342 | ||
343 | pci_read_config_word(bridge, PCI_IO_BASE, &io); | |
344 | if (!io) { | |
345 | pci_write_config_word(bridge, PCI_IO_BASE, 0xf0f0); | |
346 | pci_read_config_word(bridge, PCI_IO_BASE, &io); | |
347 | pci_write_config_word(bridge, PCI_IO_BASE, 0x0); | |
348 | } | |
349 | if (io) | |
350 | b_res[0].flags |= IORESOURCE_IO; | |
351 | /* DECchip 21050 pass 2 errata: the bridge may miss an address | |
352 | disconnect boundary by one PCI data phase. | |
353 | Workaround: do not use prefetching on this device. */ | |
354 | if (bridge->vendor == PCI_VENDOR_ID_DEC && bridge->device == 0x0001) | |
355 | return; | |
356 | pci_read_config_dword(bridge, PCI_PREF_MEMORY_BASE, &pmem); | |
357 | if (!pmem) { | |
358 | pci_write_config_dword(bridge, PCI_PREF_MEMORY_BASE, | |
359 | 0xfff0fff0); | |
360 | pci_read_config_dword(bridge, PCI_PREF_MEMORY_BASE, &pmem); | |
361 | pci_write_config_dword(bridge, PCI_PREF_MEMORY_BASE, 0x0); | |
362 | } | |
1f82de10 | 363 | if (pmem) { |
1da177e4 | 364 | b_res[2].flags |= IORESOURCE_MEM | IORESOURCE_PREFETCH; |
99586105 YL |
365 | if ((pmem & PCI_PREF_RANGE_TYPE_MASK) == |
366 | PCI_PREF_RANGE_TYPE_64) { | |
1f82de10 | 367 | b_res[2].flags |= IORESOURCE_MEM_64; |
99586105 YL |
368 | b_res[2].flags |= PCI_PREF_RANGE_TYPE_64; |
369 | } | |
1f82de10 YL |
370 | } |
371 | ||
372 | /* double check if bridge does support 64 bit pref */ | |
373 | if (b_res[2].flags & IORESOURCE_MEM_64) { | |
374 | u32 mem_base_hi, tmp; | |
375 | pci_read_config_dword(bridge, PCI_PREF_BASE_UPPER32, | |
376 | &mem_base_hi); | |
377 | pci_write_config_dword(bridge, PCI_PREF_BASE_UPPER32, | |
378 | 0xffffffff); | |
379 | pci_read_config_dword(bridge, PCI_PREF_BASE_UPPER32, &tmp); | |
380 | if (!tmp) | |
381 | b_res[2].flags &= ~IORESOURCE_MEM_64; | |
382 | pci_write_config_dword(bridge, PCI_PREF_BASE_UPPER32, | |
383 | mem_base_hi); | |
384 | } | |
1da177e4 LT |
385 | } |
386 | ||
387 | /* Helper function for sizing routines: find first available | |
388 | bus resource of a given type. Note: we intentionally skip | |
389 | the bus resources which have already been assigned (that is, | |
390 | have non-NULL parent resource). */ | |
96bde06a | 391 | static struct resource *find_free_bus_resource(struct pci_bus *bus, unsigned long type) |
1da177e4 LT |
392 | { |
393 | int i; | |
394 | struct resource *r; | |
395 | unsigned long type_mask = IORESOURCE_IO | IORESOURCE_MEM | | |
396 | IORESOURCE_PREFETCH; | |
397 | ||
89a74ecc | 398 | pci_bus_for_each_resource(bus, r, i) { |
299de034 IK |
399 | if (r == &ioport_resource || r == &iomem_resource) |
400 | continue; | |
55a10984 JB |
401 | if (r && (r->flags & type_mask) == type && !r->parent) |
402 | return r; | |
1da177e4 LT |
403 | } |
404 | return NULL; | |
405 | } | |
406 | ||
13583b16 RP |
407 | static resource_size_t calculate_iosize(resource_size_t size, |
408 | resource_size_t min_size, | |
409 | resource_size_t size1, | |
410 | resource_size_t old_size, | |
411 | resource_size_t align) | |
412 | { | |
413 | if (size < min_size) | |
414 | size = min_size; | |
415 | if (old_size == 1 ) | |
416 | old_size = 0; | |
417 | /* To be fixed in 2.5: we should have sort of HAVE_ISA | |
418 | flag in the struct pci_bus. */ | |
419 | #if defined(CONFIG_ISA) || defined(CONFIG_EISA) | |
420 | size = (size & 0xff) + ((size & ~0xffUL) << 2); | |
421 | #endif | |
422 | size = ALIGN(size + size1, align); | |
423 | if (size < old_size) | |
424 | size = old_size; | |
425 | return size; | |
426 | } | |
427 | ||
428 | static resource_size_t calculate_memsize(resource_size_t size, | |
429 | resource_size_t min_size, | |
430 | resource_size_t size1, | |
431 | resource_size_t old_size, | |
432 | resource_size_t align) | |
433 | { | |
434 | if (size < min_size) | |
435 | size = min_size; | |
436 | if (old_size == 1 ) | |
437 | old_size = 0; | |
438 | if (size < old_size) | |
439 | size = old_size; | |
440 | size = ALIGN(size + size1, align); | |
441 | return size; | |
442 | } | |
443 | ||
1da177e4 LT |
444 | /* Sizing the IO windows of the PCI-PCI bridge is trivial, |
445 | since these windows have 4K granularity and the IO ranges | |
446 | of non-bridge PCI devices are limited to 256 bytes. | |
447 | We must be careful with the ISA aliasing though. */ | |
28760489 | 448 | static void pbus_size_io(struct pci_bus *bus, resource_size_t min_size) |
1da177e4 LT |
449 | { |
450 | struct pci_dev *dev; | |
451 | struct resource *b_res = find_free_bus_resource(bus, IORESOURCE_IO); | |
13583b16 | 452 | unsigned long size = 0, size1 = 0; |
1da177e4 LT |
453 | |
454 | if (!b_res) | |
455 | return; | |
456 | ||
457 | list_for_each_entry(dev, &bus->devices, bus_list) { | |
458 | int i; | |
459 | ||
460 | for (i = 0; i < PCI_NUM_RESOURCES; i++) { | |
461 | struct resource *r = &dev->resource[i]; | |
462 | unsigned long r_size; | |
463 | ||
464 | if (r->parent || !(r->flags & IORESOURCE_IO)) | |
465 | continue; | |
022edd86 | 466 | r_size = resource_size(r); |
1da177e4 LT |
467 | |
468 | if (r_size < 0x400) | |
469 | /* Might be re-aligned for ISA */ | |
470 | size += r_size; | |
471 | else | |
472 | size1 += r_size; | |
473 | } | |
474 | } | |
13583b16 RP |
475 | size = calculate_iosize(size, min_size, size1, |
476 | resource_size(b_res), 4096); | |
1da177e4 | 477 | if (!size) { |
865df576 BH |
478 | if (b_res->start || b_res->end) |
479 | dev_info(&bus->self->dev, "disabling bridge window " | |
480 | "%pR to [bus %02x-%02x] (unused)\n", b_res, | |
481 | bus->secondary, bus->subordinate); | |
1da177e4 LT |
482 | b_res->flags = 0; |
483 | return; | |
484 | } | |
485 | /* Alignment of the IO window is always 4K */ | |
486 | b_res->start = 4096; | |
487 | b_res->end = b_res->start + size - 1; | |
88452565 | 488 | b_res->flags |= IORESOURCE_STARTALIGN; |
1da177e4 LT |
489 | } |
490 | ||
491 | /* Calculate the size of the bus and minimal alignment which | |
492 | guarantees that all child resources fit in this size. */ | |
28760489 EB |
493 | static int pbus_size_mem(struct pci_bus *bus, unsigned long mask, |
494 | unsigned long type, resource_size_t min_size) | |
1da177e4 LT |
495 | { |
496 | struct pci_dev *dev; | |
13583b16 | 497 | resource_size_t min_align, align, size; |
c40a22e0 | 498 | resource_size_t aligns[12]; /* Alignments from 1Mb to 2Gb */ |
1da177e4 LT |
499 | int order, max_order; |
500 | struct resource *b_res = find_free_bus_resource(bus, type); | |
1f82de10 | 501 | unsigned int mem64_mask = 0; |
1da177e4 LT |
502 | |
503 | if (!b_res) | |
504 | return 0; | |
505 | ||
506 | memset(aligns, 0, sizeof(aligns)); | |
507 | max_order = 0; | |
508 | size = 0; | |
509 | ||
1f82de10 YL |
510 | mem64_mask = b_res->flags & IORESOURCE_MEM_64; |
511 | b_res->flags &= ~IORESOURCE_MEM_64; | |
512 | ||
1da177e4 LT |
513 | list_for_each_entry(dev, &bus->devices, bus_list) { |
514 | int i; | |
1f82de10 | 515 | |
1da177e4 LT |
516 | for (i = 0; i < PCI_NUM_RESOURCES; i++) { |
517 | struct resource *r = &dev->resource[i]; | |
c40a22e0 | 518 | resource_size_t r_size; |
1da177e4 LT |
519 | |
520 | if (r->parent || (r->flags & mask) != type) | |
521 | continue; | |
022edd86 | 522 | r_size = resource_size(r); |
1da177e4 | 523 | /* For bridges size != alignment */ |
6faf17f6 | 524 | align = pci_resource_alignment(dev, r); |
1da177e4 LT |
525 | order = __ffs(align) - 20; |
526 | if (order > 11) { | |
865df576 BH |
527 | dev_warn(&dev->dev, "disabling BAR %d: %pR " |
528 | "(bad alignment %#llx)\n", i, r, | |
529 | (unsigned long long) align); | |
1da177e4 LT |
530 | r->flags = 0; |
531 | continue; | |
532 | } | |
533 | size += r_size; | |
534 | if (order < 0) | |
535 | order = 0; | |
536 | /* Exclude ranges with size > align from | |
537 | calculation of the alignment. */ | |
538 | if (r_size == align) | |
539 | aligns[order] += align; | |
540 | if (order > max_order) | |
541 | max_order = order; | |
1f82de10 | 542 | mem64_mask &= r->flags & IORESOURCE_MEM_64; |
1da177e4 LT |
543 | } |
544 | } | |
1da177e4 LT |
545 | align = 0; |
546 | min_align = 0; | |
547 | for (order = 0; order <= max_order; order++) { | |
8308c54d JF |
548 | resource_size_t align1 = 1; |
549 | ||
550 | align1 <<= (order + 20); | |
551 | ||
1da177e4 LT |
552 | if (!align) |
553 | min_align = align1; | |
6f6f8c2f | 554 | else if (ALIGN(align + min_align, min_align) < align1) |
1da177e4 LT |
555 | min_align = align1 >> 1; |
556 | align += aligns[order]; | |
557 | } | |
13583b16 | 558 | size = calculate_memsize(size, min_size, 0, resource_size(b_res), align); |
1da177e4 | 559 | if (!size) { |
865df576 BH |
560 | if (b_res->start || b_res->end) |
561 | dev_info(&bus->self->dev, "disabling bridge window " | |
562 | "%pR to [bus %02x-%02x] (unused)\n", b_res, | |
563 | bus->secondary, bus->subordinate); | |
1da177e4 LT |
564 | b_res->flags = 0; |
565 | return 1; | |
566 | } | |
567 | b_res->start = min_align; | |
568 | b_res->end = size + min_align - 1; | |
88452565 | 569 | b_res->flags |= IORESOURCE_STARTALIGN; |
1f82de10 | 570 | b_res->flags |= mem64_mask; |
1da177e4 LT |
571 | return 1; |
572 | } | |
573 | ||
5468ae61 | 574 | static void pci_bus_size_cardbus(struct pci_bus *bus) |
1da177e4 LT |
575 | { |
576 | struct pci_dev *bridge = bus->self; | |
577 | struct resource *b_res = &bridge->resource[PCI_BRIDGE_RESOURCES]; | |
578 | u16 ctrl; | |
579 | ||
580 | /* | |
581 | * Reserve some resources for CardBus. We reserve | |
582 | * a fixed amount of bus space for CardBus bridges. | |
583 | */ | |
934b7024 LT |
584 | b_res[0].start = 0; |
585 | b_res[0].end = pci_cardbus_io_size - 1; | |
586 | b_res[0].flags |= IORESOURCE_IO | IORESOURCE_SIZEALIGN; | |
1da177e4 | 587 | |
934b7024 LT |
588 | b_res[1].start = 0; |
589 | b_res[1].end = pci_cardbus_io_size - 1; | |
590 | b_res[1].flags |= IORESOURCE_IO | IORESOURCE_SIZEALIGN; | |
1da177e4 LT |
591 | |
592 | /* | |
593 | * Check whether prefetchable memory is supported | |
594 | * by this bridge. | |
595 | */ | |
596 | pci_read_config_word(bridge, PCI_CB_BRIDGE_CONTROL, &ctrl); | |
597 | if (!(ctrl & PCI_CB_BRIDGE_CTL_PREFETCH_MEM0)) { | |
598 | ctrl |= PCI_CB_BRIDGE_CTL_PREFETCH_MEM0; | |
599 | pci_write_config_word(bridge, PCI_CB_BRIDGE_CONTROL, ctrl); | |
600 | pci_read_config_word(bridge, PCI_CB_BRIDGE_CONTROL, &ctrl); | |
601 | } | |
602 | ||
603 | /* | |
604 | * If we have prefetchable memory support, allocate | |
605 | * two regions. Otherwise, allocate one region of | |
606 | * twice the size. | |
607 | */ | |
608 | if (ctrl & PCI_CB_BRIDGE_CTL_PREFETCH_MEM0) { | |
934b7024 LT |
609 | b_res[2].start = 0; |
610 | b_res[2].end = pci_cardbus_mem_size - 1; | |
611 | b_res[2].flags |= IORESOURCE_MEM | IORESOURCE_PREFETCH | IORESOURCE_SIZEALIGN; | |
1da177e4 | 612 | |
934b7024 LT |
613 | b_res[3].start = 0; |
614 | b_res[3].end = pci_cardbus_mem_size - 1; | |
615 | b_res[3].flags |= IORESOURCE_MEM | IORESOURCE_SIZEALIGN; | |
1da177e4 | 616 | } else { |
934b7024 LT |
617 | b_res[3].start = 0; |
618 | b_res[3].end = pci_cardbus_mem_size * 2 - 1; | |
619 | b_res[3].flags |= IORESOURCE_MEM | IORESOURCE_SIZEALIGN; | |
1da177e4 LT |
620 | } |
621 | } | |
622 | ||
451124a7 | 623 | void __ref pci_bus_size_bridges(struct pci_bus *bus) |
1da177e4 LT |
624 | { |
625 | struct pci_dev *dev; | |
626 | unsigned long mask, prefmask; | |
28760489 | 627 | resource_size_t min_mem_size = 0, min_io_size = 0; |
1da177e4 LT |
628 | |
629 | list_for_each_entry(dev, &bus->devices, bus_list) { | |
630 | struct pci_bus *b = dev->subordinate; | |
631 | if (!b) | |
632 | continue; | |
633 | ||
634 | switch (dev->class >> 8) { | |
635 | case PCI_CLASS_BRIDGE_CARDBUS: | |
636 | pci_bus_size_cardbus(b); | |
637 | break; | |
638 | ||
639 | case PCI_CLASS_BRIDGE_PCI: | |
640 | default: | |
641 | pci_bus_size_bridges(b); | |
642 | break; | |
643 | } | |
644 | } | |
645 | ||
646 | /* The root bus? */ | |
647 | if (!bus->self) | |
648 | return; | |
649 | ||
650 | switch (bus->self->class >> 8) { | |
651 | case PCI_CLASS_BRIDGE_CARDBUS: | |
652 | /* don't size cardbuses yet. */ | |
653 | break; | |
654 | ||
655 | case PCI_CLASS_BRIDGE_PCI: | |
656 | pci_bridge_check_ranges(bus); | |
28760489 EB |
657 | if (bus->self->is_hotplug_bridge) { |
658 | min_io_size = pci_hotplug_io_size; | |
659 | min_mem_size = pci_hotplug_mem_size; | |
660 | } | |
1da177e4 | 661 | default: |
28760489 | 662 | pbus_size_io(bus, min_io_size); |
1da177e4 LT |
663 | /* If the bridge supports prefetchable range, size it |
664 | separately. If it doesn't, or its prefetchable window | |
665 | has already been allocated by arch code, try | |
666 | non-prefetchable range for both types of PCI memory | |
667 | resources. */ | |
668 | mask = IORESOURCE_MEM; | |
669 | prefmask = IORESOURCE_MEM | IORESOURCE_PREFETCH; | |
28760489 | 670 | if (pbus_size_mem(bus, prefmask, prefmask, min_mem_size)) |
1da177e4 | 671 | mask = prefmask; /* Success, size non-prefetch only. */ |
28760489 EB |
672 | else |
673 | min_mem_size += min_mem_size; | |
674 | pbus_size_mem(bus, mask, IORESOURCE_MEM, min_mem_size); | |
1da177e4 LT |
675 | break; |
676 | } | |
677 | } | |
678 | EXPORT_SYMBOL(pci_bus_size_bridges); | |
679 | ||
568ddef8 YL |
680 | static void __ref __pci_bus_assign_resources(const struct pci_bus *bus, |
681 | struct resource_list_x *fail_head) | |
1da177e4 LT |
682 | { |
683 | struct pci_bus *b; | |
684 | struct pci_dev *dev; | |
685 | ||
568ddef8 | 686 | pbus_assign_resources_sorted(bus, fail_head); |
1da177e4 | 687 | |
1da177e4 LT |
688 | list_for_each_entry(dev, &bus->devices, bus_list) { |
689 | b = dev->subordinate; | |
690 | if (!b) | |
691 | continue; | |
692 | ||
568ddef8 | 693 | __pci_bus_assign_resources(b, fail_head); |
1da177e4 LT |
694 | |
695 | switch (dev->class >> 8) { | |
696 | case PCI_CLASS_BRIDGE_PCI: | |
6841ec68 YL |
697 | if (!pci_is_enabled(dev)) |
698 | pci_setup_bridge(b); | |
1da177e4 LT |
699 | break; |
700 | ||
701 | case PCI_CLASS_BRIDGE_CARDBUS: | |
702 | pci_setup_cardbus(b); | |
703 | break; | |
704 | ||
705 | default: | |
80ccba11 BH |
706 | dev_info(&dev->dev, "not setting up bridge for bus " |
707 | "%04x:%02x\n", pci_domain_nr(b), b->number); | |
1da177e4 LT |
708 | break; |
709 | } | |
710 | } | |
711 | } | |
568ddef8 YL |
712 | |
713 | void __ref pci_bus_assign_resources(const struct pci_bus *bus) | |
714 | { | |
715 | __pci_bus_assign_resources(bus, NULL); | |
716 | } | |
1da177e4 LT |
717 | EXPORT_SYMBOL(pci_bus_assign_resources); |
718 | ||
6841ec68 YL |
719 | static void __ref __pci_bridge_assign_resources(const struct pci_dev *bridge, |
720 | struct resource_list_x *fail_head) | |
721 | { | |
722 | struct pci_bus *b; | |
723 | ||
724 | pdev_assign_resources_sorted((struct pci_dev *)bridge, fail_head); | |
725 | ||
726 | b = bridge->subordinate; | |
727 | if (!b) | |
728 | return; | |
729 | ||
730 | __pci_bus_assign_resources(b, fail_head); | |
731 | ||
732 | switch (bridge->class >> 8) { | |
733 | case PCI_CLASS_BRIDGE_PCI: | |
734 | pci_setup_bridge(b); | |
735 | break; | |
736 | ||
737 | case PCI_CLASS_BRIDGE_CARDBUS: | |
738 | pci_setup_cardbus(b); | |
739 | break; | |
740 | ||
741 | default: | |
742 | dev_info(&bridge->dev, "not setting up bridge for bus " | |
743 | "%04x:%02x\n", pci_domain_nr(b), b->number); | |
744 | break; | |
745 | } | |
746 | } | |
5009b460 YL |
747 | static void pci_bridge_release_resources(struct pci_bus *bus, |
748 | unsigned long type) | |
749 | { | |
750 | int idx; | |
751 | bool changed = false; | |
752 | struct pci_dev *dev; | |
753 | struct resource *r; | |
754 | unsigned long type_mask = IORESOURCE_IO | IORESOURCE_MEM | | |
755 | IORESOURCE_PREFETCH; | |
756 | ||
757 | dev = bus->self; | |
758 | for (idx = PCI_BRIDGE_RESOURCES; idx <= PCI_BRIDGE_RESOURCE_END; | |
759 | idx++) { | |
760 | r = &dev->resource[idx]; | |
761 | if ((r->flags & type_mask) != type) | |
762 | continue; | |
763 | if (!r->parent) | |
764 | continue; | |
765 | /* | |
766 | * if there are children under that, we should release them | |
767 | * all | |
768 | */ | |
769 | release_child_resources(r); | |
770 | if (!release_resource(r)) { | |
771 | dev_printk(KERN_DEBUG, &dev->dev, | |
772 | "resource %d %pR released\n", idx, r); | |
773 | /* keep the old size */ | |
774 | r->end = resource_size(r) - 1; | |
775 | r->start = 0; | |
776 | r->flags = 0; | |
777 | changed = true; | |
778 | } | |
779 | } | |
780 | ||
781 | if (changed) { | |
782 | /* avoiding touch the one without PREF */ | |
783 | if (type & IORESOURCE_PREFETCH) | |
784 | type = IORESOURCE_PREFETCH; | |
785 | __pci_setup_bridge(bus, type); | |
786 | } | |
787 | } | |
788 | ||
789 | enum release_type { | |
790 | leaf_only, | |
791 | whole_subtree, | |
792 | }; | |
793 | /* | |
794 | * try to release pci bridge resources that is from leaf bridge, | |
795 | * so we can allocate big new one later | |
796 | */ | |
797 | static void __ref pci_bus_release_bridge_resources(struct pci_bus *bus, | |
798 | unsigned long type, | |
799 | enum release_type rel_type) | |
800 | { | |
801 | struct pci_dev *dev; | |
802 | bool is_leaf_bridge = true; | |
803 | ||
804 | list_for_each_entry(dev, &bus->devices, bus_list) { | |
805 | struct pci_bus *b = dev->subordinate; | |
806 | if (!b) | |
807 | continue; | |
808 | ||
809 | is_leaf_bridge = false; | |
810 | ||
811 | if ((dev->class >> 8) != PCI_CLASS_BRIDGE_PCI) | |
812 | continue; | |
813 | ||
814 | if (rel_type == whole_subtree) | |
815 | pci_bus_release_bridge_resources(b, type, | |
816 | whole_subtree); | |
817 | } | |
818 | ||
819 | if (pci_is_root_bus(bus)) | |
820 | return; | |
821 | ||
822 | if ((bus->self->class >> 8) != PCI_CLASS_BRIDGE_PCI) | |
823 | return; | |
824 | ||
825 | if ((rel_type == whole_subtree) || is_leaf_bridge) | |
826 | pci_bridge_release_resources(bus, type); | |
827 | } | |
828 | ||
76fbc263 YL |
829 | static void pci_bus_dump_res(struct pci_bus *bus) |
830 | { | |
89a74ecc BH |
831 | struct resource *res; |
832 | int i; | |
7c9342b8 | 833 | |
89a74ecc | 834 | pci_bus_for_each_resource(bus, res, i) { |
7c9342b8 | 835 | if (!res || !res->end || !res->flags) |
76fbc263 YL |
836 | continue; |
837 | ||
c7dabef8 | 838 | dev_printk(KERN_DEBUG, &bus->dev, "resource %d %pR\n", i, res); |
76fbc263 YL |
839 | } |
840 | } | |
841 | ||
842 | static void pci_bus_dump_resources(struct pci_bus *bus) | |
843 | { | |
844 | struct pci_bus *b; | |
845 | struct pci_dev *dev; | |
846 | ||
847 | ||
848 | pci_bus_dump_res(bus); | |
849 | ||
850 | list_for_each_entry(dev, &bus->devices, bus_list) { | |
851 | b = dev->subordinate; | |
852 | if (!b) | |
853 | continue; | |
854 | ||
855 | pci_bus_dump_resources(b); | |
856 | } | |
857 | } | |
858 | ||
1da177e4 LT |
859 | void __init |
860 | pci_assign_unassigned_resources(void) | |
861 | { | |
862 | struct pci_bus *bus; | |
977d17bb | 863 | |
1da177e4 LT |
864 | /* Depth first, calculate sizes and alignments of all |
865 | subordinate buses. */ | |
866 | list_for_each_entry(bus, &pci_root_buses, node) { | |
867 | pci_bus_size_bridges(bus); | |
868 | } | |
869 | /* Depth last, allocate resources and update the hardware. */ | |
870 | list_for_each_entry(bus, &pci_root_buses, node) { | |
769d9968 | 871 | pci_bus_assign_resources(bus); |
977d17bb | 872 | pci_enable_bridges(bus); |
769d9968 | 873 | } |
76fbc263 YL |
874 | |
875 | /* dump the resource on buses */ | |
876 | list_for_each_entry(bus, &pci_root_buses, node) { | |
877 | pci_bus_dump_resources(bus); | |
878 | } | |
1da177e4 | 879 | } |
6841ec68 YL |
880 | |
881 | void pci_assign_unassigned_bridge_resources(struct pci_dev *bridge) | |
882 | { | |
883 | struct pci_bus *parent = bridge->subordinate; | |
32180e40 YL |
884 | int tried_times = 0; |
885 | struct resource_list_x head, *list; | |
6841ec68 | 886 | int retval; |
32180e40 YL |
887 | unsigned long type_mask = IORESOURCE_IO | IORESOURCE_MEM | |
888 | IORESOURCE_PREFETCH; | |
889 | ||
890 | head.next = NULL; | |
6841ec68 | 891 | |
32180e40 | 892 | again: |
6841ec68 | 893 | pci_bus_size_bridges(parent); |
32180e40 | 894 | __pci_bridge_assign_resources(bridge, &head); |
32180e40 YL |
895 | |
896 | tried_times++; | |
897 | ||
898 | if (!head.next) | |
3f579c34 | 899 | goto enable_all; |
32180e40 YL |
900 | |
901 | if (tried_times >= 2) { | |
902 | /* still fail, don't need to try more */ | |
903 | free_failed_list(&head); | |
3f579c34 | 904 | goto enable_all; |
32180e40 YL |
905 | } |
906 | ||
907 | printk(KERN_DEBUG "PCI: No. %d try to assign unassigned res\n", | |
908 | tried_times + 1); | |
909 | ||
910 | /* | |
911 | * Try to release leaf bridge's resources that doesn't fit resource of | |
912 | * child device under that bridge | |
913 | */ | |
914 | for (list = head.next; list;) { | |
915 | struct pci_bus *bus = list->dev->bus; | |
916 | unsigned long flags = list->flags; | |
917 | ||
918 | pci_bus_release_bridge_resources(bus, flags & type_mask, | |
919 | whole_subtree); | |
920 | list = list->next; | |
921 | } | |
922 | /* restore size and flags */ | |
923 | for (list = head.next; list;) { | |
924 | struct resource *res = list->res; | |
925 | ||
926 | res->start = list->start; | |
927 | res->end = list->end; | |
928 | res->flags = list->flags; | |
929 | if (list->dev->subordinate) | |
930 | res->flags = 0; | |
931 | ||
932 | list = list->next; | |
933 | } | |
934 | free_failed_list(&head); | |
935 | ||
936 | goto again; | |
3f579c34 YL |
937 | |
938 | enable_all: | |
939 | retval = pci_reenable_device(bridge); | |
940 | pci_set_master(bridge); | |
941 | pci_enable_bridges(parent); | |
6841ec68 YL |
942 | } |
943 | EXPORT_SYMBOL_GPL(pci_assign_unassigned_bridge_resources); |