Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * probe.c - PCI detection and setup code | |
3 | */ | |
4 | ||
5 | #include <linux/kernel.h> | |
6 | #include <linux/delay.h> | |
7 | #include <linux/init.h> | |
8 | #include <linux/pci.h> | |
9 | #include <linux/slab.h> | |
10 | #include <linux/module.h> | |
11 | #include <linux/cpumask.h> | |
bc56b9e0 | 12 | #include "pci.h" |
1da177e4 LT |
13 | |
14 | #define CARDBUS_LATENCY_TIMER 176 /* secondary latency timer */ | |
15 | #define CARDBUS_RESERVE_BUSNR 3 | |
16 | #define PCI_CFG_SPACE_SIZE 256 | |
17 | #define PCI_CFG_SPACE_EXP_SIZE 4096 | |
18 | ||
19 | /* Ugh. Need to stop exporting this to modules. */ | |
20 | LIST_HEAD(pci_root_buses); | |
21 | EXPORT_SYMBOL(pci_root_buses); | |
22 | ||
23 | LIST_HEAD(pci_devices); | |
24 | ||
ed4aaadb ZY |
25 | /* |
26 | * Some device drivers need know if pci is initiated. | |
27 | * Basically, we think pci is not initiated when there | |
28 | * is no device in list of pci_devices. | |
29 | */ | |
30 | int no_pci_devices(void) | |
31 | { | |
32 | return list_empty(&pci_devices); | |
33 | } | |
34 | ||
35 | EXPORT_SYMBOL(no_pci_devices); | |
36 | ||
1da177e4 LT |
37 | #ifdef HAVE_PCI_LEGACY |
38 | /** | |
39 | * pci_create_legacy_files - create legacy I/O port and memory files | |
40 | * @b: bus to create files under | |
41 | * | |
42 | * Some platforms allow access to legacy I/O port and ISA memory space on | |
43 | * a per-bus basis. This routine creates the files and ties them into | |
44 | * their associated read, write and mmap files from pci-sysfs.c | |
45 | */ | |
46 | static void pci_create_legacy_files(struct pci_bus *b) | |
47 | { | |
f5afe806 | 48 | b->legacy_io = kzalloc(sizeof(struct bin_attribute) * 2, |
1da177e4 LT |
49 | GFP_ATOMIC); |
50 | if (b->legacy_io) { | |
1da177e4 LT |
51 | b->legacy_io->attr.name = "legacy_io"; |
52 | b->legacy_io->size = 0xffff; | |
53 | b->legacy_io->attr.mode = S_IRUSR | S_IWUSR; | |
1da177e4 LT |
54 | b->legacy_io->read = pci_read_legacy_io; |
55 | b->legacy_io->write = pci_write_legacy_io; | |
fd7d1ced | 56 | device_create_bin_file(&b->dev, b->legacy_io); |
1da177e4 LT |
57 | |
58 | /* Allocated above after the legacy_io struct */ | |
59 | b->legacy_mem = b->legacy_io + 1; | |
60 | b->legacy_mem->attr.name = "legacy_mem"; | |
61 | b->legacy_mem->size = 1024*1024; | |
62 | b->legacy_mem->attr.mode = S_IRUSR | S_IWUSR; | |
1da177e4 | 63 | b->legacy_mem->mmap = pci_mmap_legacy_mem; |
fd7d1ced | 64 | device_create_bin_file(&b->dev, b->legacy_mem); |
1da177e4 LT |
65 | } |
66 | } | |
67 | ||
68 | void pci_remove_legacy_files(struct pci_bus *b) | |
69 | { | |
70 | if (b->legacy_io) { | |
fd7d1ced GKH |
71 | device_remove_bin_file(&b->dev, b->legacy_io); |
72 | device_remove_bin_file(&b->dev, b->legacy_mem); | |
1da177e4 LT |
73 | kfree(b->legacy_io); /* both are allocated here */ |
74 | } | |
75 | } | |
76 | #else /* !HAVE_PCI_LEGACY */ | |
77 | static inline void pci_create_legacy_files(struct pci_bus *bus) { return; } | |
78 | void pci_remove_legacy_files(struct pci_bus *bus) { return; } | |
79 | #endif /* HAVE_PCI_LEGACY */ | |
80 | ||
81 | /* | |
82 | * PCI Bus Class Devices | |
83 | */ | |
fd7d1ced GKH |
84 | static ssize_t pci_bus_show_cpuaffinity(struct device *dev, |
85 | struct device_attribute *attr, | |
4327edf6 | 86 | char *buf) |
1da177e4 | 87 | { |
1da177e4 | 88 | int ret; |
4327edf6 | 89 | cpumask_t cpumask; |
1da177e4 | 90 | |
fd7d1ced | 91 | cpumask = pcibus_to_cpumask(to_pci_bus(dev)); |
1da177e4 LT |
92 | ret = cpumask_scnprintf(buf, PAGE_SIZE, cpumask); |
93 | if (ret < PAGE_SIZE) | |
94 | buf[ret++] = '\n'; | |
95 | return ret; | |
96 | } | |
fd7d1ced | 97 | DEVICE_ATTR(cpuaffinity, S_IRUGO, pci_bus_show_cpuaffinity, NULL); |
1da177e4 LT |
98 | |
99 | /* | |
100 | * PCI Bus Class | |
101 | */ | |
fd7d1ced | 102 | static void release_pcibus_dev(struct device *dev) |
1da177e4 | 103 | { |
fd7d1ced | 104 | struct pci_bus *pci_bus = to_pci_bus(dev); |
1da177e4 LT |
105 | |
106 | if (pci_bus->bridge) | |
107 | put_device(pci_bus->bridge); | |
108 | kfree(pci_bus); | |
109 | } | |
110 | ||
111 | static struct class pcibus_class = { | |
112 | .name = "pci_bus", | |
fd7d1ced | 113 | .dev_release = &release_pcibus_dev, |
1da177e4 LT |
114 | }; |
115 | ||
116 | static int __init pcibus_class_init(void) | |
117 | { | |
118 | return class_register(&pcibus_class); | |
119 | } | |
120 | postcore_initcall(pcibus_class_init); | |
121 | ||
122 | /* | |
123 | * Translate the low bits of the PCI base | |
124 | * to the resource type | |
125 | */ | |
126 | static inline unsigned int pci_calc_resource_flags(unsigned int flags) | |
127 | { | |
128 | if (flags & PCI_BASE_ADDRESS_SPACE_IO) | |
129 | return IORESOURCE_IO; | |
130 | ||
131 | if (flags & PCI_BASE_ADDRESS_MEM_PREFETCH) | |
132 | return IORESOURCE_MEM | IORESOURCE_PREFETCH; | |
133 | ||
134 | return IORESOURCE_MEM; | |
135 | } | |
136 | ||
137 | /* | |
138 | * Find the extent of a PCI decode.. | |
139 | */ | |
f797f9cc | 140 | static u32 pci_size(u32 base, u32 maxbase, u32 mask) |
1da177e4 LT |
141 | { |
142 | u32 size = mask & maxbase; /* Find the significant bits */ | |
143 | if (!size) | |
144 | return 0; | |
145 | ||
146 | /* Get the lowest of them to find the decode size, and | |
147 | from that the extent. */ | |
148 | size = (size & ~(size-1)) - 1; | |
149 | ||
150 | /* base == maxbase can be valid only if the BAR has | |
151 | already been programmed with all 1s. */ | |
152 | if (base == maxbase && ((base | size) & mask) != mask) | |
153 | return 0; | |
154 | ||
155 | return size; | |
156 | } | |
157 | ||
07eddf3d YL |
158 | static u64 pci_size64(u64 base, u64 maxbase, u64 mask) |
159 | { | |
160 | u64 size = mask & maxbase; /* Find the significant bits */ | |
161 | if (!size) | |
162 | return 0; | |
163 | ||
164 | /* Get the lowest of them to find the decode size, and | |
165 | from that the extent. */ | |
166 | size = (size & ~(size-1)) - 1; | |
167 | ||
168 | /* base == maxbase can be valid only if the BAR has | |
169 | already been programmed with all 1s. */ | |
170 | if (base == maxbase && ((base | size) & mask) != mask) | |
171 | return 0; | |
172 | ||
173 | return size; | |
174 | } | |
175 | ||
176 | static inline int is_64bit_memory(u32 mask) | |
177 | { | |
178 | if ((mask & (PCI_BASE_ADDRESS_SPACE|PCI_BASE_ADDRESS_MEM_TYPE_MASK)) == | |
179 | (PCI_BASE_ADDRESS_SPACE_MEMORY|PCI_BASE_ADDRESS_MEM_TYPE_64)) | |
180 | return 1; | |
181 | return 0; | |
182 | } | |
183 | ||
1da177e4 LT |
184 | static void pci_read_bases(struct pci_dev *dev, unsigned int howmany, int rom) |
185 | { | |
186 | unsigned int pos, reg, next; | |
187 | u32 l, sz; | |
188 | struct resource *res; | |
189 | ||
190 | for(pos=0; pos<howmany; pos = next) { | |
07eddf3d YL |
191 | u64 l64; |
192 | u64 sz64; | |
193 | u32 raw_sz; | |
194 | ||
1da177e4 LT |
195 | next = pos+1; |
196 | res = &dev->resource[pos]; | |
197 | res->name = pci_name(dev); | |
198 | reg = PCI_BASE_ADDRESS_0 + (pos << 2); | |
199 | pci_read_config_dword(dev, reg, &l); | |
200 | pci_write_config_dword(dev, reg, ~0); | |
201 | pci_read_config_dword(dev, reg, &sz); | |
202 | pci_write_config_dword(dev, reg, l); | |
203 | if (!sz || sz == 0xffffffff) | |
204 | continue; | |
205 | if (l == 0xffffffff) | |
206 | l = 0; | |
07eddf3d YL |
207 | raw_sz = sz; |
208 | if ((l & PCI_BASE_ADDRESS_SPACE) == | |
209 | PCI_BASE_ADDRESS_SPACE_MEMORY) { | |
3c6de929 | 210 | sz = pci_size(l, sz, (u32)PCI_BASE_ADDRESS_MEM_MASK); |
07eddf3d YL |
211 | /* |
212 | * For 64bit prefetchable memory sz could be 0, if the | |
213 | * real size is bigger than 4G, so we need to check | |
214 | * szhi for that. | |
215 | */ | |
216 | if (!is_64bit_memory(l) && !sz) | |
1da177e4 LT |
217 | continue; |
218 | res->start = l & PCI_BASE_ADDRESS_MEM_MASK; | |
219 | res->flags |= l & ~PCI_BASE_ADDRESS_MEM_MASK; | |
220 | } else { | |
221 | sz = pci_size(l, sz, PCI_BASE_ADDRESS_IO_MASK & 0xffff); | |
222 | if (!sz) | |
223 | continue; | |
224 | res->start = l & PCI_BASE_ADDRESS_IO_MASK; | |
225 | res->flags |= l & ~PCI_BASE_ADDRESS_IO_MASK; | |
226 | } | |
227 | res->end = res->start + (unsigned long) sz; | |
228 | res->flags |= pci_calc_resource_flags(l); | |
07eddf3d | 229 | if (is_64bit_memory(l)) { |
17d6dc8f | 230 | u32 szhi, lhi; |
07eddf3d | 231 | |
17d6dc8f PA |
232 | pci_read_config_dword(dev, reg+4, &lhi); |
233 | pci_write_config_dword(dev, reg+4, ~0); | |
234 | pci_read_config_dword(dev, reg+4, &szhi); | |
235 | pci_write_config_dword(dev, reg+4, lhi); | |
07eddf3d YL |
236 | sz64 = ((u64)szhi << 32) | raw_sz; |
237 | l64 = ((u64)lhi << 32) | l; | |
238 | sz64 = pci_size64(l64, sz64, PCI_BASE_ADDRESS_MEM_MASK); | |
1da177e4 LT |
239 | next++; |
240 | #if BITS_PER_LONG == 64 | |
07eddf3d YL |
241 | if (!sz64) { |
242 | res->start = 0; | |
243 | res->end = 0; | |
244 | res->flags = 0; | |
245 | continue; | |
1da177e4 | 246 | } |
07eddf3d YL |
247 | res->start = l64 & PCI_BASE_ADDRESS_MEM_MASK; |
248 | res->end = res->start + sz64; | |
1da177e4 | 249 | #else |
07eddf3d YL |
250 | if (sz64 > 0x100000000ULL) { |
251 | printk(KERN_ERR "PCI: Unable to handle 64-bit " | |
252 | "BAR for device %s\n", pci_name(dev)); | |
1da177e4 LT |
253 | res->start = 0; |
254 | res->flags = 0; | |
ea28502d | 255 | } else if (lhi) { |
17d6dc8f | 256 | /* 64-bit wide address, treat as disabled */ |
07eddf3d YL |
257 | pci_write_config_dword(dev, reg, |
258 | l & ~(u32)PCI_BASE_ADDRESS_MEM_MASK); | |
17d6dc8f PA |
259 | pci_write_config_dword(dev, reg+4, 0); |
260 | res->start = 0; | |
261 | res->end = sz; | |
1da177e4 LT |
262 | } |
263 | #endif | |
264 | } | |
265 | } | |
266 | if (rom) { | |
267 | dev->rom_base_reg = rom; | |
268 | res = &dev->resource[PCI_ROM_RESOURCE]; | |
269 | res->name = pci_name(dev); | |
270 | pci_read_config_dword(dev, rom, &l); | |
271 | pci_write_config_dword(dev, rom, ~PCI_ROM_ADDRESS_ENABLE); | |
272 | pci_read_config_dword(dev, rom, &sz); | |
273 | pci_write_config_dword(dev, rom, l); | |
274 | if (l == 0xffffffff) | |
275 | l = 0; | |
276 | if (sz && sz != 0xffffffff) { | |
3c6de929 | 277 | sz = pci_size(l, sz, (u32)PCI_ROM_ADDRESS_MASK); |
1da177e4 LT |
278 | if (sz) { |
279 | res->flags = (l & IORESOURCE_ROM_ENABLE) | | |
bb446093 GH |
280 | IORESOURCE_MEM | IORESOURCE_PREFETCH | |
281 | IORESOURCE_READONLY | IORESOURCE_CACHEABLE; | |
1da177e4 LT |
282 | res->start = l & PCI_ROM_ADDRESS_MASK; |
283 | res->end = res->start + (unsigned long) sz; | |
284 | } | |
285 | } | |
286 | } | |
287 | } | |
288 | ||
e365c3e7 | 289 | void pci_read_bridge_bases(struct pci_bus *child) |
1da177e4 LT |
290 | { |
291 | struct pci_dev *dev = child->self; | |
292 | u8 io_base_lo, io_limit_lo; | |
293 | u16 mem_base_lo, mem_limit_lo; | |
294 | unsigned long base, limit; | |
295 | struct resource *res; | |
296 | int i; | |
297 | ||
298 | if (!dev) /* It's a host bus, nothing to read */ | |
299 | return; | |
300 | ||
301 | if (dev->transparent) { | |
302 | printk(KERN_INFO "PCI: Transparent bridge - %s\n", pci_name(dev)); | |
90b54929 IK |
303 | for(i = 3; i < PCI_BUS_NUM_RESOURCES; i++) |
304 | child->resource[i] = child->parent->resource[i - 3]; | |
1da177e4 LT |
305 | } |
306 | ||
307 | for(i=0; i<3; i++) | |
308 | child->resource[i] = &dev->resource[PCI_BRIDGE_RESOURCES+i]; | |
309 | ||
310 | res = child->resource[0]; | |
311 | pci_read_config_byte(dev, PCI_IO_BASE, &io_base_lo); | |
312 | pci_read_config_byte(dev, PCI_IO_LIMIT, &io_limit_lo); | |
313 | base = (io_base_lo & PCI_IO_RANGE_MASK) << 8; | |
314 | limit = (io_limit_lo & PCI_IO_RANGE_MASK) << 8; | |
315 | ||
316 | if ((io_base_lo & PCI_IO_RANGE_TYPE_MASK) == PCI_IO_RANGE_TYPE_32) { | |
317 | u16 io_base_hi, io_limit_hi; | |
318 | pci_read_config_word(dev, PCI_IO_BASE_UPPER16, &io_base_hi); | |
319 | pci_read_config_word(dev, PCI_IO_LIMIT_UPPER16, &io_limit_hi); | |
320 | base |= (io_base_hi << 16); | |
321 | limit |= (io_limit_hi << 16); | |
322 | } | |
323 | ||
324 | if (base <= limit) { | |
325 | res->flags = (io_base_lo & PCI_IO_RANGE_TYPE_MASK) | IORESOURCE_IO; | |
9d265124 DY |
326 | if (!res->start) |
327 | res->start = base; | |
328 | if (!res->end) | |
329 | res->end = limit + 0xfff; | |
1da177e4 LT |
330 | } |
331 | ||
332 | res = child->resource[1]; | |
333 | pci_read_config_word(dev, PCI_MEMORY_BASE, &mem_base_lo); | |
334 | pci_read_config_word(dev, PCI_MEMORY_LIMIT, &mem_limit_lo); | |
335 | base = (mem_base_lo & PCI_MEMORY_RANGE_MASK) << 16; | |
336 | limit = (mem_limit_lo & PCI_MEMORY_RANGE_MASK) << 16; | |
337 | if (base <= limit) { | |
338 | res->flags = (mem_base_lo & PCI_MEMORY_RANGE_TYPE_MASK) | IORESOURCE_MEM; | |
339 | res->start = base; | |
340 | res->end = limit + 0xfffff; | |
341 | } | |
342 | ||
343 | res = child->resource[2]; | |
344 | pci_read_config_word(dev, PCI_PREF_MEMORY_BASE, &mem_base_lo); | |
345 | pci_read_config_word(dev, PCI_PREF_MEMORY_LIMIT, &mem_limit_lo); | |
346 | base = (mem_base_lo & PCI_PREF_RANGE_MASK) << 16; | |
347 | limit = (mem_limit_lo & PCI_PREF_RANGE_MASK) << 16; | |
348 | ||
349 | if ((mem_base_lo & PCI_PREF_RANGE_TYPE_MASK) == PCI_PREF_RANGE_TYPE_64) { | |
350 | u32 mem_base_hi, mem_limit_hi; | |
351 | pci_read_config_dword(dev, PCI_PREF_BASE_UPPER32, &mem_base_hi); | |
352 | pci_read_config_dword(dev, PCI_PREF_LIMIT_UPPER32, &mem_limit_hi); | |
353 | ||
354 | /* | |
355 | * Some bridges set the base > limit by default, and some | |
356 | * (broken) BIOSes do not initialize them. If we find | |
357 | * this, just assume they are not being used. | |
358 | */ | |
359 | if (mem_base_hi <= mem_limit_hi) { | |
360 | #if BITS_PER_LONG == 64 | |
361 | base |= ((long) mem_base_hi) << 32; | |
362 | limit |= ((long) mem_limit_hi) << 32; | |
363 | #else | |
364 | if (mem_base_hi || mem_limit_hi) { | |
365 | printk(KERN_ERR "PCI: Unable to handle 64-bit address space for bridge %s\n", pci_name(dev)); | |
366 | return; | |
367 | } | |
368 | #endif | |
369 | } | |
370 | } | |
371 | if (base <= limit) { | |
372 | res->flags = (mem_base_lo & PCI_MEMORY_RANGE_TYPE_MASK) | IORESOURCE_MEM | IORESOURCE_PREFETCH; | |
373 | res->start = base; | |
374 | res->end = limit + 0xfffff; | |
375 | } | |
376 | } | |
377 | ||
96bde06a | 378 | static struct pci_bus * pci_alloc_bus(void) |
1da177e4 LT |
379 | { |
380 | struct pci_bus *b; | |
381 | ||
f5afe806 | 382 | b = kzalloc(sizeof(*b), GFP_KERNEL); |
1da177e4 | 383 | if (b) { |
1da177e4 LT |
384 | INIT_LIST_HEAD(&b->node); |
385 | INIT_LIST_HEAD(&b->children); | |
386 | INIT_LIST_HEAD(&b->devices); | |
387 | } | |
388 | return b; | |
389 | } | |
390 | ||
391 | static struct pci_bus * __devinit | |
392 | pci_alloc_child_bus(struct pci_bus *parent, struct pci_dev *bridge, int busnr) | |
393 | { | |
394 | struct pci_bus *child; | |
395 | int i; | |
396 | ||
397 | /* | |
398 | * Allocate a new bus, and inherit stuff from the parent.. | |
399 | */ | |
400 | child = pci_alloc_bus(); | |
401 | if (!child) | |
402 | return NULL; | |
403 | ||
404 | child->self = bridge; | |
405 | child->parent = parent; | |
406 | child->ops = parent->ops; | |
407 | child->sysdata = parent->sysdata; | |
6e325a62 | 408 | child->bus_flags = parent->bus_flags; |
1da177e4 LT |
409 | child->bridge = get_device(&bridge->dev); |
410 | ||
fd7d1ced GKH |
411 | /* initialize some portions of the bus device, but don't register it |
412 | * now as the parent is not properly set up yet. This device will get | |
413 | * registered later in pci_bus_add_devices() | |
414 | */ | |
415 | child->dev.class = &pcibus_class; | |
416 | sprintf(child->dev.bus_id, "%04x:%02x", pci_domain_nr(child), busnr); | |
1da177e4 LT |
417 | |
418 | /* | |
419 | * Set up the primary, secondary and subordinate | |
420 | * bus numbers. | |
421 | */ | |
422 | child->number = child->secondary = busnr; | |
423 | child->primary = parent->secondary; | |
424 | child->subordinate = 0xff; | |
425 | ||
426 | /* Set up default resource pointers and names.. */ | |
427 | for (i = 0; i < 4; i++) { | |
428 | child->resource[i] = &bridge->resource[PCI_BRIDGE_RESOURCES+i]; | |
429 | child->resource[i]->name = child->name; | |
430 | } | |
431 | bridge->subordinate = child; | |
432 | ||
433 | return child; | |
434 | } | |
435 | ||
451124a7 | 436 | struct pci_bus *__ref pci_add_new_bus(struct pci_bus *parent, struct pci_dev *dev, int busnr) |
1da177e4 LT |
437 | { |
438 | struct pci_bus *child; | |
439 | ||
440 | child = pci_alloc_child_bus(parent, dev, busnr); | |
e4ea9bb7 | 441 | if (child) { |
d71374da | 442 | down_write(&pci_bus_sem); |
1da177e4 | 443 | list_add_tail(&child->node, &parent->children); |
d71374da | 444 | up_write(&pci_bus_sem); |
e4ea9bb7 | 445 | } |
1da177e4 LT |
446 | return child; |
447 | } | |
448 | ||
96bde06a | 449 | static void pci_fixup_parent_subordinate_busnr(struct pci_bus *child, int max) |
26f674ae GKH |
450 | { |
451 | struct pci_bus *parent = child->parent; | |
12f44f46 IK |
452 | |
453 | /* Attempts to fix that up are really dangerous unless | |
454 | we're going to re-assign all bus numbers. */ | |
455 | if (!pcibios_assign_all_busses()) | |
456 | return; | |
457 | ||
26f674ae GKH |
458 | while (parent->parent && parent->subordinate < max) { |
459 | parent->subordinate = max; | |
460 | pci_write_config_byte(parent->self, PCI_SUBORDINATE_BUS, max); | |
461 | parent = parent->parent; | |
462 | } | |
463 | } | |
464 | ||
1da177e4 LT |
465 | /* |
466 | * If it's a bridge, configure it and scan the bus behind it. | |
467 | * For CardBus bridges, we don't scan behind as the devices will | |
468 | * be handled by the bridge driver itself. | |
469 | * | |
470 | * We need to process bridges in two passes -- first we scan those | |
471 | * already configured by the BIOS and after we are done with all of | |
472 | * them, we proceed to assigning numbers to the remaining buses in | |
473 | * order to avoid overlaps between old and new bus numbers. | |
474 | */ | |
96bde06a | 475 | int pci_scan_bridge(struct pci_bus *bus, struct pci_dev * dev, int max, int pass) |
1da177e4 LT |
476 | { |
477 | struct pci_bus *child; | |
478 | int is_cardbus = (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS); | |
49887941 | 479 | u32 buses, i, j = 0; |
1da177e4 LT |
480 | u16 bctl; |
481 | ||
482 | pci_read_config_dword(dev, PCI_PRIMARY_BUS, &buses); | |
483 | ||
484 | pr_debug("PCI: Scanning behind PCI bridge %s, config %06x, pass %d\n", | |
485 | pci_name(dev), buses & 0xffffff, pass); | |
486 | ||
487 | /* Disable MasterAbortMode during probing to avoid reporting | |
488 | of bus errors (in some architectures) */ | |
489 | pci_read_config_word(dev, PCI_BRIDGE_CONTROL, &bctl); | |
490 | pci_write_config_word(dev, PCI_BRIDGE_CONTROL, | |
491 | bctl & ~PCI_BRIDGE_CTL_MASTER_ABORT); | |
492 | ||
1da177e4 LT |
493 | if ((buses & 0xffff00) && !pcibios_assign_all_busses() && !is_cardbus) { |
494 | unsigned int cmax, busnr; | |
495 | /* | |
496 | * Bus already configured by firmware, process it in the first | |
497 | * pass and just note the configuration. | |
498 | */ | |
499 | if (pass) | |
bbe8f9a3 | 500 | goto out; |
1da177e4 LT |
501 | busnr = (buses >> 8) & 0xFF; |
502 | ||
503 | /* | |
504 | * If we already got to this bus through a different bridge, | |
505 | * ignore it. This can happen with the i450NX chipset. | |
506 | */ | |
507 | if (pci_find_bus(pci_domain_nr(bus), busnr)) { | |
508 | printk(KERN_INFO "PCI: Bus %04x:%02x already known\n", | |
509 | pci_domain_nr(bus), busnr); | |
bbe8f9a3 | 510 | goto out; |
1da177e4 LT |
511 | } |
512 | ||
6ef6f0e3 | 513 | child = pci_add_new_bus(bus, dev, busnr); |
1da177e4 | 514 | if (!child) |
bbe8f9a3 | 515 | goto out; |
1da177e4 LT |
516 | child->primary = buses & 0xFF; |
517 | child->subordinate = (buses >> 16) & 0xFF; | |
11949255 | 518 | child->bridge_ctl = bctl; |
1da177e4 LT |
519 | |
520 | cmax = pci_scan_child_bus(child); | |
521 | if (cmax > max) | |
522 | max = cmax; | |
523 | if (child->subordinate > max) | |
524 | max = child->subordinate; | |
525 | } else { | |
526 | /* | |
527 | * We need to assign a number to this bus which we always | |
528 | * do in the second pass. | |
529 | */ | |
12f44f46 IK |
530 | if (!pass) { |
531 | if (pcibios_assign_all_busses()) | |
532 | /* Temporarily disable forwarding of the | |
533 | configuration cycles on all bridges in | |
534 | this bus segment to avoid possible | |
535 | conflicts in the second pass between two | |
536 | bridges programmed with overlapping | |
537 | bus ranges. */ | |
538 | pci_write_config_dword(dev, PCI_PRIMARY_BUS, | |
539 | buses & ~0xffffff); | |
bbe8f9a3 | 540 | goto out; |
12f44f46 | 541 | } |
1da177e4 LT |
542 | |
543 | /* Clear errors */ | |
544 | pci_write_config_word(dev, PCI_STATUS, 0xffff); | |
545 | ||
cc57450f RS |
546 | /* Prevent assigning a bus number that already exists. |
547 | * This can happen when a bridge is hot-plugged */ | |
548 | if (pci_find_bus(pci_domain_nr(bus), max+1)) | |
bbe8f9a3 | 549 | goto out; |
6ef6f0e3 | 550 | child = pci_add_new_bus(bus, dev, ++max); |
1da177e4 LT |
551 | buses = (buses & 0xff000000) |
552 | | ((unsigned int)(child->primary) << 0) | |
553 | | ((unsigned int)(child->secondary) << 8) | |
554 | | ((unsigned int)(child->subordinate) << 16); | |
555 | ||
556 | /* | |
557 | * yenta.c forces a secondary latency timer of 176. | |
558 | * Copy that behaviour here. | |
559 | */ | |
560 | if (is_cardbus) { | |
561 | buses &= ~0xff000000; | |
562 | buses |= CARDBUS_LATENCY_TIMER << 24; | |
563 | } | |
564 | ||
565 | /* | |
566 | * We need to blast all three values with a single write. | |
567 | */ | |
568 | pci_write_config_dword(dev, PCI_PRIMARY_BUS, buses); | |
569 | ||
570 | if (!is_cardbus) { | |
11949255 | 571 | child->bridge_ctl = bctl; |
26f674ae GKH |
572 | /* |
573 | * Adjust subordinate busnr in parent buses. | |
574 | * We do this before scanning for children because | |
575 | * some devices may not be detected if the bios | |
576 | * was lazy. | |
577 | */ | |
578 | pci_fixup_parent_subordinate_busnr(child, max); | |
1da177e4 LT |
579 | /* Now we can scan all subordinate buses... */ |
580 | max = pci_scan_child_bus(child); | |
e3ac86d8 KA |
581 | /* |
582 | * now fix it up again since we have found | |
583 | * the real value of max. | |
584 | */ | |
585 | pci_fixup_parent_subordinate_busnr(child, max); | |
1da177e4 LT |
586 | } else { |
587 | /* | |
588 | * For CardBus bridges, we leave 4 bus numbers | |
589 | * as cards with a PCI-to-PCI bridge can be | |
590 | * inserted later. | |
591 | */ | |
49887941 DB |
592 | for (i=0; i<CARDBUS_RESERVE_BUSNR; i++) { |
593 | struct pci_bus *parent = bus; | |
cc57450f RS |
594 | if (pci_find_bus(pci_domain_nr(bus), |
595 | max+i+1)) | |
596 | break; | |
49887941 DB |
597 | while (parent->parent) { |
598 | if ((!pcibios_assign_all_busses()) && | |
599 | (parent->subordinate > max) && | |
600 | (parent->subordinate <= max+i)) { | |
601 | j = 1; | |
602 | } | |
603 | parent = parent->parent; | |
604 | } | |
605 | if (j) { | |
606 | /* | |
607 | * Often, there are two cardbus bridges | |
608 | * -- try to leave one valid bus number | |
609 | * for each one. | |
610 | */ | |
611 | i /= 2; | |
612 | break; | |
613 | } | |
614 | } | |
cc57450f | 615 | max += i; |
26f674ae | 616 | pci_fixup_parent_subordinate_busnr(child, max); |
1da177e4 LT |
617 | } |
618 | /* | |
619 | * Set the subordinate bus number to its real value. | |
620 | */ | |
621 | child->subordinate = max; | |
622 | pci_write_config_byte(dev, PCI_SUBORDINATE_BUS, max); | |
623 | } | |
624 | ||
1da177e4 LT |
625 | sprintf(child->name, (is_cardbus ? "PCI CardBus #%02x" : "PCI Bus #%02x"), child->number); |
626 | ||
d55bef51 | 627 | /* Has only triggered on CardBus, fixup is in yenta_socket */ |
49887941 DB |
628 | while (bus->parent) { |
629 | if ((child->subordinate > bus->subordinate) || | |
630 | (child->number > bus->subordinate) || | |
631 | (child->number < bus->number) || | |
632 | (child->subordinate < bus->number)) { | |
a6f29a98 | 633 | pr_debug("PCI: Bus #%02x (-#%02x) is %s " |
d55bef51 BK |
634 | "hidden behind%s bridge #%02x (-#%02x)\n", |
635 | child->number, child->subordinate, | |
636 | (bus->number > child->subordinate && | |
637 | bus->subordinate < child->number) ? | |
a6f29a98 JP |
638 | "wholly" : "partially", |
639 | bus->self->transparent ? " transparent" : "", | |
d55bef51 | 640 | bus->number, bus->subordinate); |
49887941 DB |
641 | } |
642 | bus = bus->parent; | |
643 | } | |
644 | ||
bbe8f9a3 RB |
645 | out: |
646 | pci_write_config_word(dev, PCI_BRIDGE_CONTROL, bctl); | |
647 | ||
1da177e4 LT |
648 | return max; |
649 | } | |
650 | ||
651 | /* | |
652 | * Read interrupt line and base address registers. | |
653 | * The architecture-dependent code can tweak these, of course. | |
654 | */ | |
655 | static void pci_read_irq(struct pci_dev *dev) | |
656 | { | |
657 | unsigned char irq; | |
658 | ||
659 | pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &irq); | |
ffeff788 | 660 | dev->pin = irq; |
1da177e4 LT |
661 | if (irq) |
662 | pci_read_config_byte(dev, PCI_INTERRUPT_LINE, &irq); | |
663 | dev->irq = irq; | |
664 | } | |
665 | ||
01abc2aa | 666 | #define LEGACY_IO_RESOURCE (IORESOURCE_IO | IORESOURCE_PCI_FIXED) |
76e6a1d6 | 667 | |
1da177e4 LT |
668 | /** |
669 | * pci_setup_device - fill in class and map information of a device | |
670 | * @dev: the device structure to fill | |
671 | * | |
672 | * Initialize the device structure with information about the device's | |
673 | * vendor,class,memory and IO-space addresses,IRQ lines etc. | |
674 | * Called at initialisation of the PCI subsystem and by CardBus services. | |
675 | * Returns 0 on success and -1 if unknown type of device (not normal, bridge | |
676 | * or CardBus). | |
677 | */ | |
678 | static int pci_setup_device(struct pci_dev * dev) | |
679 | { | |
680 | u32 class; | |
681 | ||
682 | sprintf(pci_name(dev), "%04x:%02x:%02x.%d", pci_domain_nr(dev->bus), | |
683 | dev->bus->number, PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn)); | |
684 | ||
685 | pci_read_config_dword(dev, PCI_CLASS_REVISION, &class); | |
b8a3a521 | 686 | dev->revision = class & 0xff; |
1da177e4 LT |
687 | class >>= 8; /* upper 3 bytes */ |
688 | dev->class = class; | |
689 | class >>= 8; | |
690 | ||
691 | pr_debug("PCI: Found %s [%04x/%04x] %06x %02x\n", pci_name(dev), | |
692 | dev->vendor, dev->device, class, dev->hdr_type); | |
693 | ||
694 | /* "Unknown power state" */ | |
3fe9d19f | 695 | dev->current_state = PCI_UNKNOWN; |
1da177e4 LT |
696 | |
697 | /* Early fixups, before probing the BARs */ | |
698 | pci_fixup_device(pci_fixup_early, dev); | |
699 | class = dev->class >> 8; | |
700 | ||
701 | switch (dev->hdr_type) { /* header type */ | |
702 | case PCI_HEADER_TYPE_NORMAL: /* standard header */ | |
703 | if (class == PCI_CLASS_BRIDGE_PCI) | |
704 | goto bad; | |
705 | pci_read_irq(dev); | |
706 | pci_read_bases(dev, 6, PCI_ROM_ADDRESS); | |
707 | pci_read_config_word(dev, PCI_SUBSYSTEM_VENDOR_ID, &dev->subsystem_vendor); | |
708 | pci_read_config_word(dev, PCI_SUBSYSTEM_ID, &dev->subsystem_device); | |
368c73d4 AC |
709 | |
710 | /* | |
711 | * Do the ugly legacy mode stuff here rather than broken chip | |
712 | * quirk code. Legacy mode ATA controllers have fixed | |
713 | * addresses. These are not always echoed in BAR0-3, and | |
714 | * BAR0-3 in a few cases contain junk! | |
715 | */ | |
716 | if (class == PCI_CLASS_STORAGE_IDE) { | |
717 | u8 progif; | |
718 | pci_read_config_byte(dev, PCI_CLASS_PROG, &progif); | |
719 | if ((progif & 1) == 0) { | |
af1bff4f LT |
720 | dev->resource[0].start = 0x1F0; |
721 | dev->resource[0].end = 0x1F7; | |
722 | dev->resource[0].flags = LEGACY_IO_RESOURCE; | |
723 | dev->resource[1].start = 0x3F6; | |
724 | dev->resource[1].end = 0x3F6; | |
725 | dev->resource[1].flags = LEGACY_IO_RESOURCE; | |
368c73d4 AC |
726 | } |
727 | if ((progif & 4) == 0) { | |
af1bff4f LT |
728 | dev->resource[2].start = 0x170; |
729 | dev->resource[2].end = 0x177; | |
730 | dev->resource[2].flags = LEGACY_IO_RESOURCE; | |
731 | dev->resource[3].start = 0x376; | |
732 | dev->resource[3].end = 0x376; | |
733 | dev->resource[3].flags = LEGACY_IO_RESOURCE; | |
368c73d4 AC |
734 | } |
735 | } | |
1da177e4 LT |
736 | break; |
737 | ||
738 | case PCI_HEADER_TYPE_BRIDGE: /* bridge header */ | |
739 | if (class != PCI_CLASS_BRIDGE_PCI) | |
740 | goto bad; | |
741 | /* The PCI-to-PCI bridge spec requires that subtractive | |
742 | decoding (i.e. transparent) bridge must have programming | |
743 | interface code of 0x01. */ | |
3efd273b | 744 | pci_read_irq(dev); |
1da177e4 LT |
745 | dev->transparent = ((dev->class & 0xff) == 1); |
746 | pci_read_bases(dev, 2, PCI_ROM_ADDRESS1); | |
747 | break; | |
748 | ||
749 | case PCI_HEADER_TYPE_CARDBUS: /* CardBus bridge header */ | |
750 | if (class != PCI_CLASS_BRIDGE_CARDBUS) | |
751 | goto bad; | |
752 | pci_read_irq(dev); | |
753 | pci_read_bases(dev, 1, 0); | |
754 | pci_read_config_word(dev, PCI_CB_SUBSYSTEM_VENDOR_ID, &dev->subsystem_vendor); | |
755 | pci_read_config_word(dev, PCI_CB_SUBSYSTEM_ID, &dev->subsystem_device); | |
756 | break; | |
757 | ||
758 | default: /* unknown header */ | |
759 | printk(KERN_ERR "PCI: device %s has unknown header type %02x, ignoring.\n", | |
760 | pci_name(dev), dev->hdr_type); | |
761 | return -1; | |
762 | ||
763 | bad: | |
764 | printk(KERN_ERR "PCI: %s: class %x doesn't match header type %02x. Ignoring class.\n", | |
765 | pci_name(dev), class, dev->hdr_type); | |
766 | dev->class = PCI_CLASS_NOT_DEFINED; | |
767 | } | |
768 | ||
769 | /* We found a fine healthy device, go go go... */ | |
770 | return 0; | |
771 | } | |
772 | ||
773 | /** | |
774 | * pci_release_dev - free a pci device structure when all users of it are finished. | |
775 | * @dev: device that's been disconnected | |
776 | * | |
777 | * Will be called only by the device core when all users of this pci device are | |
778 | * done. | |
779 | */ | |
780 | static void pci_release_dev(struct device *dev) | |
781 | { | |
782 | struct pci_dev *pci_dev; | |
783 | ||
784 | pci_dev = to_pci_dev(dev); | |
785 | kfree(pci_dev); | |
786 | } | |
787 | ||
994a65e2 KA |
788 | static void set_pcie_port_type(struct pci_dev *pdev) |
789 | { | |
790 | int pos; | |
791 | u16 reg16; | |
792 | ||
793 | pos = pci_find_capability(pdev, PCI_CAP_ID_EXP); | |
794 | if (!pos) | |
795 | return; | |
796 | pdev->is_pcie = 1; | |
797 | pci_read_config_word(pdev, pos + PCI_EXP_FLAGS, ®16); | |
798 | pdev->pcie_type = (reg16 & PCI_EXP_FLAGS_TYPE) >> 4; | |
799 | } | |
800 | ||
1da177e4 LT |
801 | /** |
802 | * pci_cfg_space_size - get the configuration space size of the PCI device. | |
8f7020d3 | 803 | * @dev: PCI device |
1da177e4 LT |
804 | * |
805 | * Regular PCI devices have 256 bytes, but PCI-X 2 and PCI Express devices | |
806 | * have 4096 bytes. Even if the device is capable, that doesn't mean we can | |
807 | * access it. Maybe we don't have a way to generate extended config space | |
808 | * accesses, or the device is behind a reverse Express bridge. So we try | |
809 | * reading the dword at 0x100 which must either be 0 or a valid extended | |
810 | * capability header. | |
811 | */ | |
ac7dc65a | 812 | int pci_cfg_space_size(struct pci_dev *dev) |
1da177e4 LT |
813 | { |
814 | int pos; | |
815 | u32 status; | |
816 | ||
817 | pos = pci_find_capability(dev, PCI_CAP_ID_EXP); | |
818 | if (!pos) { | |
819 | pos = pci_find_capability(dev, PCI_CAP_ID_PCIX); | |
820 | if (!pos) | |
821 | goto fail; | |
822 | ||
823 | pci_read_config_dword(dev, pos + PCI_X_STATUS, &status); | |
824 | if (!(status & (PCI_X_STATUS_266MHZ | PCI_X_STATUS_533MHZ))) | |
825 | goto fail; | |
826 | } | |
827 | ||
828 | if (pci_read_config_dword(dev, 256, &status) != PCIBIOS_SUCCESSFUL) | |
829 | goto fail; | |
830 | if (status == 0xffffffff) | |
831 | goto fail; | |
832 | ||
833 | return PCI_CFG_SPACE_EXP_SIZE; | |
834 | ||
835 | fail: | |
836 | return PCI_CFG_SPACE_SIZE; | |
837 | } | |
838 | ||
839 | static void pci_release_bus_bridge_dev(struct device *dev) | |
840 | { | |
841 | kfree(dev); | |
842 | } | |
843 | ||
65891215 ME |
844 | struct pci_dev *alloc_pci_dev(void) |
845 | { | |
846 | struct pci_dev *dev; | |
847 | ||
848 | dev = kzalloc(sizeof(struct pci_dev), GFP_KERNEL); | |
849 | if (!dev) | |
850 | return NULL; | |
851 | ||
852 | INIT_LIST_HEAD(&dev->global_list); | |
853 | INIT_LIST_HEAD(&dev->bus_list); | |
854 | ||
4aa9bc95 ME |
855 | pci_msi_init_pci_dev(dev); |
856 | ||
65891215 ME |
857 | return dev; |
858 | } | |
859 | EXPORT_SYMBOL(alloc_pci_dev); | |
860 | ||
1da177e4 LT |
861 | /* |
862 | * Read the config data for a PCI device, sanity-check it | |
863 | * and fill in the dev structure... | |
864 | */ | |
865 | static struct pci_dev * __devinit | |
866 | pci_scan_device(struct pci_bus *bus, int devfn) | |
867 | { | |
868 | struct pci_dev *dev; | |
869 | u32 l; | |
870 | u8 hdr_type; | |
871 | int delay = 1; | |
872 | ||
873 | if (pci_bus_read_config_dword(bus, devfn, PCI_VENDOR_ID, &l)) | |
874 | return NULL; | |
875 | ||
876 | /* some broken boards return 0 or ~0 if a slot is empty: */ | |
877 | if (l == 0xffffffff || l == 0x00000000 || | |
878 | l == 0x0000ffff || l == 0xffff0000) | |
879 | return NULL; | |
880 | ||
881 | /* Configuration request Retry Status */ | |
882 | while (l == 0xffff0001) { | |
883 | msleep(delay); | |
884 | delay *= 2; | |
885 | if (pci_bus_read_config_dword(bus, devfn, PCI_VENDOR_ID, &l)) | |
886 | return NULL; | |
887 | /* Card hasn't responded in 60 seconds? Must be stuck. */ | |
888 | if (delay > 60 * 1000) { | |
889 | printk(KERN_WARNING "Device %04x:%02x:%02x.%d not " | |
890 | "responding\n", pci_domain_nr(bus), | |
891 | bus->number, PCI_SLOT(devfn), | |
892 | PCI_FUNC(devfn)); | |
893 | return NULL; | |
894 | } | |
895 | } | |
896 | ||
897 | if (pci_bus_read_config_byte(bus, devfn, PCI_HEADER_TYPE, &hdr_type)) | |
898 | return NULL; | |
899 | ||
bab41e9b | 900 | dev = alloc_pci_dev(); |
1da177e4 LT |
901 | if (!dev) |
902 | return NULL; | |
903 | ||
1da177e4 LT |
904 | dev->bus = bus; |
905 | dev->sysdata = bus->sysdata; | |
906 | dev->dev.parent = bus->bridge; | |
907 | dev->dev.bus = &pci_bus_type; | |
908 | dev->devfn = devfn; | |
909 | dev->hdr_type = hdr_type & 0x7f; | |
910 | dev->multifunction = !!(hdr_type & 0x80); | |
911 | dev->vendor = l & 0xffff; | |
912 | dev->device = (l >> 16) & 0xffff; | |
913 | dev->cfg_size = pci_cfg_space_size(dev); | |
82081797 | 914 | dev->error_state = pci_channel_io_normal; |
994a65e2 | 915 | set_pcie_port_type(dev); |
1da177e4 LT |
916 | |
917 | /* Assume 32-bit PCI; let 64-bit PCI cards (which are far rarer) | |
918 | set this higher, assuming the system even supports it. */ | |
919 | dev->dma_mask = 0xffffffff; | |
920 | if (pci_setup_device(dev) < 0) { | |
921 | kfree(dev); | |
922 | return NULL; | |
923 | } | |
1da177e4 LT |
924 | |
925 | return dev; | |
926 | } | |
927 | ||
96bde06a | 928 | void pci_device_add(struct pci_dev *dev, struct pci_bus *bus) |
1da177e4 | 929 | { |
cdb9b9f7 PM |
930 | device_initialize(&dev->dev); |
931 | dev->dev.release = pci_release_dev; | |
932 | pci_dev_get(dev); | |
1da177e4 | 933 | |
87348136 | 934 | set_dev_node(&dev->dev, pcibus_to_node(bus)); |
cdb9b9f7 PM |
935 | dev->dev.dma_mask = &dev->dma_mask; |
936 | dev->dev.coherent_dma_mask = 0xffffffffull; | |
1da177e4 | 937 | |
1da177e4 LT |
938 | /* Fix up broken headers */ |
939 | pci_fixup_device(pci_fixup_header, dev); | |
940 | ||
941 | /* | |
942 | * Add the device to our list of discovered devices | |
943 | * and the bus list for fixup functions, etc. | |
944 | */ | |
945 | INIT_LIST_HEAD(&dev->global_list); | |
d71374da | 946 | down_write(&pci_bus_sem); |
1da177e4 | 947 | list_add_tail(&dev->bus_list, &bus->devices); |
d71374da | 948 | up_write(&pci_bus_sem); |
cdb9b9f7 PM |
949 | } |
950 | ||
451124a7 | 951 | struct pci_dev *__ref pci_scan_single_device(struct pci_bus *bus, int devfn) |
cdb9b9f7 PM |
952 | { |
953 | struct pci_dev *dev; | |
954 | ||
955 | dev = pci_scan_device(bus, devfn); | |
956 | if (!dev) | |
957 | return NULL; | |
958 | ||
959 | pci_device_add(dev, bus); | |
1da177e4 LT |
960 | |
961 | return dev; | |
962 | } | |
b73e9687 | 963 | EXPORT_SYMBOL(pci_scan_single_device); |
1da177e4 LT |
964 | |
965 | /** | |
966 | * pci_scan_slot - scan a PCI slot on a bus for devices. | |
967 | * @bus: PCI bus to scan | |
968 | * @devfn: slot number to scan (must have zero function.) | |
969 | * | |
970 | * Scan a PCI slot on the specified PCI bus for devices, adding | |
971 | * discovered devices to the @bus->devices list. New devices | |
972 | * will have an empty dev->global_list head. | |
973 | */ | |
96bde06a | 974 | int pci_scan_slot(struct pci_bus *bus, int devfn) |
1da177e4 LT |
975 | { |
976 | int func, nr = 0; | |
977 | int scan_all_fns; | |
978 | ||
979 | scan_all_fns = pcibios_scan_all_fns(bus, devfn); | |
980 | ||
981 | for (func = 0; func < 8; func++, devfn++) { | |
982 | struct pci_dev *dev; | |
983 | ||
984 | dev = pci_scan_single_device(bus, devfn); | |
985 | if (dev) { | |
986 | nr++; | |
987 | ||
988 | /* | |
989 | * If this is a single function device, | |
990 | * don't scan past the first function. | |
991 | */ | |
992 | if (!dev->multifunction) { | |
993 | if (func > 0) { | |
994 | dev->multifunction = 1; | |
995 | } else { | |
996 | break; | |
997 | } | |
998 | } | |
999 | } else { | |
1000 | if (func == 0 && !scan_all_fns) | |
1001 | break; | |
1002 | } | |
1003 | } | |
1004 | return nr; | |
1005 | } | |
1006 | ||
96bde06a | 1007 | unsigned int pci_scan_child_bus(struct pci_bus *bus) |
1da177e4 LT |
1008 | { |
1009 | unsigned int devfn, pass, max = bus->secondary; | |
1010 | struct pci_dev *dev; | |
1011 | ||
1012 | pr_debug("PCI: Scanning bus %04x:%02x\n", pci_domain_nr(bus), bus->number); | |
1013 | ||
1014 | /* Go find them, Rover! */ | |
1015 | for (devfn = 0; devfn < 0x100; devfn += 8) | |
1016 | pci_scan_slot(bus, devfn); | |
1017 | ||
1018 | /* | |
1019 | * After performing arch-dependent fixup of the bus, look behind | |
1020 | * all PCI-to-PCI bridges on this bus. | |
1021 | */ | |
1022 | pr_debug("PCI: Fixups for bus %04x:%02x\n", pci_domain_nr(bus), bus->number); | |
1023 | pcibios_fixup_bus(bus); | |
1024 | for (pass=0; pass < 2; pass++) | |
1025 | list_for_each_entry(dev, &bus->devices, bus_list) { | |
1026 | if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE || | |
1027 | dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) | |
1028 | max = pci_scan_bridge(bus, dev, max, pass); | |
1029 | } | |
1030 | ||
1031 | /* | |
1032 | * We've scanned the bus and so we know all about what's on | |
1033 | * the other side of any bridges that may be on this bus plus | |
1034 | * any devices. | |
1035 | * | |
1036 | * Return how far we've got finding sub-buses. | |
1037 | */ | |
1038 | pr_debug("PCI: Bus scan for %04x:%02x returning with max=%02x\n", | |
1039 | pci_domain_nr(bus), bus->number, max); | |
1040 | return max; | |
1041 | } | |
1042 | ||
96bde06a | 1043 | struct pci_bus * pci_create_bus(struct device *parent, |
cdb9b9f7 | 1044 | int bus, struct pci_ops *ops, void *sysdata) |
1da177e4 LT |
1045 | { |
1046 | int error; | |
1047 | struct pci_bus *b; | |
1048 | struct device *dev; | |
1049 | ||
1050 | b = pci_alloc_bus(); | |
1051 | if (!b) | |
1052 | return NULL; | |
1053 | ||
1054 | dev = kmalloc(sizeof(*dev), GFP_KERNEL); | |
1055 | if (!dev){ | |
1056 | kfree(b); | |
1057 | return NULL; | |
1058 | } | |
1059 | ||
1060 | b->sysdata = sysdata; | |
1061 | b->ops = ops; | |
1062 | ||
1063 | if (pci_find_bus(pci_domain_nr(b), bus)) { | |
1064 | /* If we already got to this bus through a different bridge, ignore it */ | |
1065 | pr_debug("PCI: Bus %04x:%02x already known\n", pci_domain_nr(b), bus); | |
1066 | goto err_out; | |
1067 | } | |
d71374da ZY |
1068 | |
1069 | down_write(&pci_bus_sem); | |
1da177e4 | 1070 | list_add_tail(&b->node, &pci_root_buses); |
d71374da | 1071 | up_write(&pci_bus_sem); |
1da177e4 LT |
1072 | |
1073 | memset(dev, 0, sizeof(*dev)); | |
1074 | dev->parent = parent; | |
1075 | dev->release = pci_release_bus_bridge_dev; | |
1076 | sprintf(dev->bus_id, "pci%04x:%02x", pci_domain_nr(b), bus); | |
1077 | error = device_register(dev); | |
1078 | if (error) | |
1079 | goto dev_reg_err; | |
1080 | b->bridge = get_device(dev); | |
1081 | ||
fd7d1ced GKH |
1082 | b->dev.class = &pcibus_class; |
1083 | b->dev.parent = b->bridge; | |
1084 | sprintf(b->dev.bus_id, "%04x:%02x", pci_domain_nr(b), bus); | |
1085 | error = device_register(&b->dev); | |
1da177e4 LT |
1086 | if (error) |
1087 | goto class_dev_reg_err; | |
fd7d1ced | 1088 | error = device_create_file(&b->dev, &dev_attr_cpuaffinity); |
1da177e4 | 1089 | if (error) |
fd7d1ced | 1090 | goto dev_create_file_err; |
1da177e4 LT |
1091 | |
1092 | /* Create legacy_io and legacy_mem files for this bus */ | |
1093 | pci_create_legacy_files(b); | |
1094 | ||
1da177e4 LT |
1095 | b->number = b->secondary = bus; |
1096 | b->resource[0] = &ioport_resource; | |
1097 | b->resource[1] = &iomem_resource; | |
1098 | ||
1da177e4 LT |
1099 | return b; |
1100 | ||
fd7d1ced GKH |
1101 | dev_create_file_err: |
1102 | device_unregister(&b->dev); | |
1da177e4 LT |
1103 | class_dev_reg_err: |
1104 | device_unregister(dev); | |
1105 | dev_reg_err: | |
d71374da | 1106 | down_write(&pci_bus_sem); |
1da177e4 | 1107 | list_del(&b->node); |
d71374da | 1108 | up_write(&pci_bus_sem); |
1da177e4 LT |
1109 | err_out: |
1110 | kfree(dev); | |
1111 | kfree(b); | |
1112 | return NULL; | |
1113 | } | |
cdb9b9f7 | 1114 | |
96bde06a | 1115 | struct pci_bus *pci_scan_bus_parented(struct device *parent, |
cdb9b9f7 PM |
1116 | int bus, struct pci_ops *ops, void *sysdata) |
1117 | { | |
1118 | struct pci_bus *b; | |
1119 | ||
1120 | b = pci_create_bus(parent, bus, ops, sysdata); | |
1121 | if (b) | |
1122 | b->subordinate = pci_scan_child_bus(b); | |
1123 | return b; | |
1124 | } | |
1da177e4 LT |
1125 | EXPORT_SYMBOL(pci_scan_bus_parented); |
1126 | ||
1127 | #ifdef CONFIG_HOTPLUG | |
1128 | EXPORT_SYMBOL(pci_add_new_bus); | |
1da177e4 LT |
1129 | EXPORT_SYMBOL(pci_scan_slot); |
1130 | EXPORT_SYMBOL(pci_scan_bridge); | |
1da177e4 LT |
1131 | EXPORT_SYMBOL_GPL(pci_scan_child_bus); |
1132 | #endif | |
6b4b78fe MD |
1133 | |
1134 | static int __init pci_sort_bf_cmp(const struct pci_dev *a, const struct pci_dev *b) | |
1135 | { | |
1136 | if (pci_domain_nr(a->bus) < pci_domain_nr(b->bus)) return -1; | |
1137 | else if (pci_domain_nr(a->bus) > pci_domain_nr(b->bus)) return 1; | |
1138 | ||
1139 | if (a->bus->number < b->bus->number) return -1; | |
1140 | else if (a->bus->number > b->bus->number) return 1; | |
1141 | ||
1142 | if (a->devfn < b->devfn) return -1; | |
1143 | else if (a->devfn > b->devfn) return 1; | |
1144 | ||
1145 | return 0; | |
1146 | } | |
1147 | ||
1148 | /* | |
1149 | * Yes, this forcably breaks the klist abstraction temporarily. It | |
1150 | * just wants to sort the klist, not change reference counts and | |
1151 | * take/drop locks rapidly in the process. It does all this while | |
1152 | * holding the lock for the list, so objects can't otherwise be | |
1153 | * added/removed while we're swizzling. | |
1154 | */ | |
1155 | static void __init pci_insertion_sort_klist(struct pci_dev *a, struct list_head *list) | |
1156 | { | |
1157 | struct list_head *pos; | |
1158 | struct klist_node *n; | |
1159 | struct device *dev; | |
1160 | struct pci_dev *b; | |
1161 | ||
1162 | list_for_each(pos, list) { | |
1163 | n = container_of(pos, struct klist_node, n_node); | |
1164 | dev = container_of(n, struct device, knode_bus); | |
1165 | b = to_pci_dev(dev); | |
1166 | if (pci_sort_bf_cmp(a, b) <= 0) { | |
1167 | list_move_tail(&a->dev.knode_bus.n_node, &b->dev.knode_bus.n_node); | |
1168 | return; | |
1169 | } | |
1170 | } | |
1171 | list_move_tail(&a->dev.knode_bus.n_node, list); | |
1172 | } | |
1173 | ||
1174 | static void __init pci_sort_breadthfirst_klist(void) | |
1175 | { | |
1176 | LIST_HEAD(sorted_devices); | |
1177 | struct list_head *pos, *tmp; | |
1178 | struct klist_node *n; | |
1179 | struct device *dev; | |
1180 | struct pci_dev *pdev; | |
b249072e | 1181 | struct klist *device_klist; |
6b4b78fe | 1182 | |
b249072e GKH |
1183 | device_klist = bus_get_device_klist(&pci_bus_type); |
1184 | ||
1185 | spin_lock(&device_klist->k_lock); | |
1186 | list_for_each_safe(pos, tmp, &device_klist->k_list) { | |
6b4b78fe MD |
1187 | n = container_of(pos, struct klist_node, n_node); |
1188 | dev = container_of(n, struct device, knode_bus); | |
1189 | pdev = to_pci_dev(dev); | |
1190 | pci_insertion_sort_klist(pdev, &sorted_devices); | |
1191 | } | |
b249072e GKH |
1192 | list_splice(&sorted_devices, &device_klist->k_list); |
1193 | spin_unlock(&device_klist->k_lock); | |
6b4b78fe MD |
1194 | } |
1195 | ||
1196 | static void __init pci_insertion_sort_devices(struct pci_dev *a, struct list_head *list) | |
1197 | { | |
1198 | struct pci_dev *b; | |
1199 | ||
1200 | list_for_each_entry(b, list, global_list) { | |
1201 | if (pci_sort_bf_cmp(a, b) <= 0) { | |
1202 | list_move_tail(&a->global_list, &b->global_list); | |
1203 | return; | |
1204 | } | |
1205 | } | |
1206 | list_move_tail(&a->global_list, list); | |
1207 | } | |
1208 | ||
1209 | static void __init pci_sort_breadthfirst_devices(void) | |
1210 | { | |
1211 | LIST_HEAD(sorted_devices); | |
1212 | struct pci_dev *dev, *tmp; | |
1213 | ||
1214 | down_write(&pci_bus_sem); | |
1215 | list_for_each_entry_safe(dev, tmp, &pci_devices, global_list) { | |
1216 | pci_insertion_sort_devices(dev, &sorted_devices); | |
1217 | } | |
1218 | list_splice(&sorted_devices, &pci_devices); | |
1219 | up_write(&pci_bus_sem); | |
1220 | } | |
1221 | ||
1222 | void __init pci_sort_breadthfirst(void) | |
1223 | { | |
1224 | pci_sort_breadthfirst_devices(); | |
1225 | pci_sort_breadthfirst_klist(); | |
1226 | } | |
1227 |