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> | |
7d715a6c | 12 | #include <linux/pci-aspm.h> |
bc56b9e0 | 13 | #include "pci.h" |
1da177e4 LT |
14 | |
15 | #define CARDBUS_LATENCY_TIMER 176 /* secondary latency timer */ | |
16 | #define CARDBUS_RESERVE_BUSNR 3 | |
1da177e4 LT |
17 | |
18 | /* Ugh. Need to stop exporting this to modules. */ | |
19 | LIST_HEAD(pci_root_buses); | |
20 | EXPORT_SYMBOL(pci_root_buses); | |
21 | ||
70308923 GKH |
22 | |
23 | static int find_anything(struct device *dev, void *data) | |
24 | { | |
25 | return 1; | |
26 | } | |
1da177e4 | 27 | |
ed4aaadb ZY |
28 | /* |
29 | * Some device drivers need know if pci is initiated. | |
30 | * Basically, we think pci is not initiated when there | |
70308923 | 31 | * is no device to be found on the pci_bus_type. |
ed4aaadb ZY |
32 | */ |
33 | int no_pci_devices(void) | |
34 | { | |
70308923 GKH |
35 | struct device *dev; |
36 | int no_devices; | |
ed4aaadb | 37 | |
70308923 GKH |
38 | dev = bus_find_device(&pci_bus_type, NULL, NULL, find_anything); |
39 | no_devices = (dev == NULL); | |
40 | put_device(dev); | |
41 | return no_devices; | |
42 | } | |
ed4aaadb ZY |
43 | EXPORT_SYMBOL(no_pci_devices); |
44 | ||
1da177e4 LT |
45 | /* |
46 | * PCI Bus Class | |
47 | */ | |
fd7d1ced | 48 | static void release_pcibus_dev(struct device *dev) |
1da177e4 | 49 | { |
fd7d1ced | 50 | struct pci_bus *pci_bus = to_pci_bus(dev); |
1da177e4 LT |
51 | |
52 | if (pci_bus->bridge) | |
53 | put_device(pci_bus->bridge); | |
2fe2abf8 | 54 | pci_bus_remove_resources(pci_bus); |
98d9f30c | 55 | pci_release_bus_of_node(pci_bus); |
1da177e4 LT |
56 | kfree(pci_bus); |
57 | } | |
58 | ||
59 | static struct class pcibus_class = { | |
60 | .name = "pci_bus", | |
fd7d1ced | 61 | .dev_release = &release_pcibus_dev, |
b9d320fc | 62 | .dev_attrs = pcibus_dev_attrs, |
1da177e4 LT |
63 | }; |
64 | ||
65 | static int __init pcibus_class_init(void) | |
66 | { | |
67 | return class_register(&pcibus_class); | |
68 | } | |
69 | postcore_initcall(pcibus_class_init); | |
70 | ||
71 | /* | |
72 | * Translate the low bits of the PCI base | |
73 | * to the resource type | |
74 | */ | |
75 | static inline unsigned int pci_calc_resource_flags(unsigned int flags) | |
76 | { | |
77 | if (flags & PCI_BASE_ADDRESS_SPACE_IO) | |
78 | return IORESOURCE_IO; | |
79 | ||
80 | if (flags & PCI_BASE_ADDRESS_MEM_PREFETCH) | |
81 | return IORESOURCE_MEM | IORESOURCE_PREFETCH; | |
82 | ||
83 | return IORESOURCE_MEM; | |
84 | } | |
85 | ||
6ac665c6 | 86 | static u64 pci_size(u64 base, u64 maxbase, u64 mask) |
1da177e4 | 87 | { |
6ac665c6 | 88 | u64 size = mask & maxbase; /* Find the significant bits */ |
1da177e4 LT |
89 | if (!size) |
90 | return 0; | |
91 | ||
92 | /* Get the lowest of them to find the decode size, and | |
93 | from that the extent. */ | |
94 | size = (size & ~(size-1)) - 1; | |
95 | ||
96 | /* base == maxbase can be valid only if the BAR has | |
97 | already been programmed with all 1s. */ | |
98 | if (base == maxbase && ((base | size) & mask) != mask) | |
99 | return 0; | |
100 | ||
101 | return size; | |
102 | } | |
103 | ||
6ac665c6 MW |
104 | static inline enum pci_bar_type decode_bar(struct resource *res, u32 bar) |
105 | { | |
106 | if ((bar & PCI_BASE_ADDRESS_SPACE) == PCI_BASE_ADDRESS_SPACE_IO) { | |
107 | res->flags = bar & ~PCI_BASE_ADDRESS_IO_MASK; | |
108 | return pci_bar_io; | |
109 | } | |
07eddf3d | 110 | |
6ac665c6 | 111 | res->flags = bar & ~PCI_BASE_ADDRESS_MEM_MASK; |
07eddf3d | 112 | |
e354597c | 113 | if (res->flags & PCI_BASE_ADDRESS_MEM_TYPE_64) |
6ac665c6 MW |
114 | return pci_bar_mem64; |
115 | return pci_bar_mem32; | |
07eddf3d YL |
116 | } |
117 | ||
0b400c7e YZ |
118 | /** |
119 | * pci_read_base - read a PCI BAR | |
120 | * @dev: the PCI device | |
121 | * @type: type of the BAR | |
122 | * @res: resource buffer to be filled in | |
123 | * @pos: BAR position in the config space | |
124 | * | |
125 | * Returns 1 if the BAR is 64-bit, or 0 if 32-bit. | |
6ac665c6 | 126 | */ |
0b400c7e | 127 | int __pci_read_base(struct pci_dev *dev, enum pci_bar_type type, |
6ac665c6 | 128 | struct resource *res, unsigned int pos) |
07eddf3d | 129 | { |
6ac665c6 | 130 | u32 l, sz, mask; |
253d2e54 | 131 | u16 orig_cmd; |
6ac665c6 | 132 | |
1ed67439 | 133 | mask = type ? PCI_ROM_ADDRESS_MASK : ~0; |
6ac665c6 | 134 | |
253d2e54 JP |
135 | if (!dev->mmio_always_on) { |
136 | pci_read_config_word(dev, PCI_COMMAND, &orig_cmd); | |
137 | pci_write_config_word(dev, PCI_COMMAND, | |
138 | orig_cmd & ~(PCI_COMMAND_MEMORY | PCI_COMMAND_IO)); | |
139 | } | |
140 | ||
6ac665c6 MW |
141 | res->name = pci_name(dev); |
142 | ||
143 | pci_read_config_dword(dev, pos, &l); | |
1ed67439 | 144 | pci_write_config_dword(dev, pos, l | mask); |
6ac665c6 MW |
145 | pci_read_config_dword(dev, pos, &sz); |
146 | pci_write_config_dword(dev, pos, l); | |
147 | ||
253d2e54 JP |
148 | if (!dev->mmio_always_on) |
149 | pci_write_config_word(dev, PCI_COMMAND, orig_cmd); | |
150 | ||
6ac665c6 MW |
151 | /* |
152 | * All bits set in sz means the device isn't working properly. | |
45aa23b4 BH |
153 | * If the BAR isn't implemented, all bits must be 0. If it's a |
154 | * memory BAR or a ROM, bit 0 must be clear; if it's an io BAR, bit | |
155 | * 1 must be clear. | |
6ac665c6 | 156 | */ |
45aa23b4 | 157 | if (!sz || sz == 0xffffffff) |
6ac665c6 MW |
158 | goto fail; |
159 | ||
160 | /* | |
161 | * I don't know how l can have all bits set. Copied from old code. | |
162 | * Maybe it fixes a bug on some ancient platform. | |
163 | */ | |
164 | if (l == 0xffffffff) | |
165 | l = 0; | |
166 | ||
167 | if (type == pci_bar_unknown) { | |
168 | type = decode_bar(res, l); | |
169 | res->flags |= pci_calc_resource_flags(l) | IORESOURCE_SIZEALIGN; | |
170 | if (type == pci_bar_io) { | |
171 | l &= PCI_BASE_ADDRESS_IO_MASK; | |
5aceca9d | 172 | mask = PCI_BASE_ADDRESS_IO_MASK & (u32) IO_SPACE_LIMIT; |
6ac665c6 MW |
173 | } else { |
174 | l &= PCI_BASE_ADDRESS_MEM_MASK; | |
175 | mask = (u32)PCI_BASE_ADDRESS_MEM_MASK; | |
176 | } | |
177 | } else { | |
178 | res->flags |= (l & IORESOURCE_ROM_ENABLE); | |
179 | l &= PCI_ROM_ADDRESS_MASK; | |
180 | mask = (u32)PCI_ROM_ADDRESS_MASK; | |
181 | } | |
182 | ||
183 | if (type == pci_bar_mem64) { | |
184 | u64 l64 = l; | |
185 | u64 sz64 = sz; | |
186 | u64 mask64 = mask | (u64)~0 << 32; | |
187 | ||
188 | pci_read_config_dword(dev, pos + 4, &l); | |
189 | pci_write_config_dword(dev, pos + 4, ~0); | |
190 | pci_read_config_dword(dev, pos + 4, &sz); | |
191 | pci_write_config_dword(dev, pos + 4, l); | |
192 | ||
193 | l64 |= ((u64)l << 32); | |
194 | sz64 |= ((u64)sz << 32); | |
195 | ||
196 | sz64 = pci_size(l64, sz64, mask64); | |
197 | ||
198 | if (!sz64) | |
199 | goto fail; | |
200 | ||
cc5499c3 | 201 | if ((sizeof(resource_size_t) < 8) && (sz64 > 0x100000000ULL)) { |
865df576 BH |
202 | dev_err(&dev->dev, "reg %x: can't handle 64-bit BAR\n", |
203 | pos); | |
6ac665c6 | 204 | goto fail; |
c7dabef8 BH |
205 | } |
206 | ||
207 | res->flags |= IORESOURCE_MEM_64; | |
208 | if ((sizeof(resource_size_t) < 8) && l) { | |
6ac665c6 MW |
209 | /* Address above 32-bit boundary; disable the BAR */ |
210 | pci_write_config_dword(dev, pos, 0); | |
211 | pci_write_config_dword(dev, pos + 4, 0); | |
212 | res->start = 0; | |
213 | res->end = sz64; | |
214 | } else { | |
215 | res->start = l64; | |
216 | res->end = l64 + sz64; | |
c7dabef8 | 217 | dev_printk(KERN_DEBUG, &dev->dev, "reg %x: %pR\n", |
a369c791 | 218 | pos, res); |
6ac665c6 MW |
219 | } |
220 | } else { | |
45aa23b4 | 221 | sz = pci_size(l, sz, mask); |
6ac665c6 | 222 | |
45aa23b4 | 223 | if (!sz) |
6ac665c6 MW |
224 | goto fail; |
225 | ||
226 | res->start = l; | |
45aa23b4 | 227 | res->end = l + sz; |
f393d9b1 | 228 | |
c7dabef8 | 229 | dev_printk(KERN_DEBUG, &dev->dev, "reg %x: %pR\n", pos, res); |
6ac665c6 MW |
230 | } |
231 | ||
232 | out: | |
233 | return (type == pci_bar_mem64) ? 1 : 0; | |
234 | fail: | |
235 | res->flags = 0; | |
236 | goto out; | |
07eddf3d YL |
237 | } |
238 | ||
1da177e4 LT |
239 | static void pci_read_bases(struct pci_dev *dev, unsigned int howmany, int rom) |
240 | { | |
6ac665c6 | 241 | unsigned int pos, reg; |
07eddf3d | 242 | |
6ac665c6 MW |
243 | for (pos = 0; pos < howmany; pos++) { |
244 | struct resource *res = &dev->resource[pos]; | |
1da177e4 | 245 | reg = PCI_BASE_ADDRESS_0 + (pos << 2); |
6ac665c6 | 246 | pos += __pci_read_base(dev, pci_bar_unknown, res, reg); |
1da177e4 | 247 | } |
6ac665c6 | 248 | |
1da177e4 | 249 | if (rom) { |
6ac665c6 | 250 | struct resource *res = &dev->resource[PCI_ROM_RESOURCE]; |
1da177e4 | 251 | dev->rom_base_reg = rom; |
6ac665c6 MW |
252 | res->flags = IORESOURCE_MEM | IORESOURCE_PREFETCH | |
253 | IORESOURCE_READONLY | IORESOURCE_CACHEABLE | | |
254 | IORESOURCE_SIZEALIGN; | |
255 | __pci_read_base(dev, pci_bar_mem32, res, rom); | |
1da177e4 LT |
256 | } |
257 | } | |
258 | ||
fa27b2d1 | 259 | static void __devinit pci_read_bridge_io(struct pci_bus *child) |
1da177e4 LT |
260 | { |
261 | struct pci_dev *dev = child->self; | |
262 | u8 io_base_lo, io_limit_lo; | |
1da177e4 LT |
263 | unsigned long base, limit; |
264 | struct resource *res; | |
1da177e4 | 265 | |
1da177e4 LT |
266 | res = child->resource[0]; |
267 | pci_read_config_byte(dev, PCI_IO_BASE, &io_base_lo); | |
268 | pci_read_config_byte(dev, PCI_IO_LIMIT, &io_limit_lo); | |
269 | base = (io_base_lo & PCI_IO_RANGE_MASK) << 8; | |
270 | limit = (io_limit_lo & PCI_IO_RANGE_MASK) << 8; | |
271 | ||
272 | if ((io_base_lo & PCI_IO_RANGE_TYPE_MASK) == PCI_IO_RANGE_TYPE_32) { | |
273 | u16 io_base_hi, io_limit_hi; | |
274 | pci_read_config_word(dev, PCI_IO_BASE_UPPER16, &io_base_hi); | |
275 | pci_read_config_word(dev, PCI_IO_LIMIT_UPPER16, &io_limit_hi); | |
276 | base |= (io_base_hi << 16); | |
277 | limit |= (io_limit_hi << 16); | |
278 | } | |
279 | ||
cd81e1ea | 280 | if (base && base <= limit) { |
1da177e4 | 281 | res->flags = (io_base_lo & PCI_IO_RANGE_TYPE_MASK) | IORESOURCE_IO; |
9d265124 DY |
282 | if (!res->start) |
283 | res->start = base; | |
284 | if (!res->end) | |
285 | res->end = limit + 0xfff; | |
c7dabef8 | 286 | dev_printk(KERN_DEBUG, &dev->dev, " bridge window %pR\n", res); |
cd81e1ea YL |
287 | } else { |
288 | dev_printk(KERN_DEBUG, &dev->dev, | |
7b8ff6da | 289 | " bridge window [io %#06lx-%#06lx] (disabled)\n", |
cd81e1ea | 290 | base, limit); |
1da177e4 | 291 | } |
fa27b2d1 BH |
292 | } |
293 | ||
294 | static void __devinit pci_read_bridge_mmio(struct pci_bus *child) | |
295 | { | |
296 | struct pci_dev *dev = child->self; | |
297 | u16 mem_base_lo, mem_limit_lo; | |
298 | unsigned long base, limit; | |
299 | struct resource *res; | |
1da177e4 LT |
300 | |
301 | res = child->resource[1]; | |
302 | pci_read_config_word(dev, PCI_MEMORY_BASE, &mem_base_lo); | |
303 | pci_read_config_word(dev, PCI_MEMORY_LIMIT, &mem_limit_lo); | |
304 | base = (mem_base_lo & PCI_MEMORY_RANGE_MASK) << 16; | |
305 | limit = (mem_limit_lo & PCI_MEMORY_RANGE_MASK) << 16; | |
cd81e1ea | 306 | if (base && base <= limit) { |
1da177e4 LT |
307 | res->flags = (mem_base_lo & PCI_MEMORY_RANGE_TYPE_MASK) | IORESOURCE_MEM; |
308 | res->start = base; | |
309 | res->end = limit + 0xfffff; | |
c7dabef8 | 310 | dev_printk(KERN_DEBUG, &dev->dev, " bridge window %pR\n", res); |
cd81e1ea YL |
311 | } else { |
312 | dev_printk(KERN_DEBUG, &dev->dev, | |
7b8ff6da | 313 | " bridge window [mem %#010lx-%#010lx] (disabled)\n", |
cd81e1ea | 314 | base, limit + 0xfffff); |
1da177e4 | 315 | } |
fa27b2d1 BH |
316 | } |
317 | ||
318 | static void __devinit pci_read_bridge_mmio_pref(struct pci_bus *child) | |
319 | { | |
320 | struct pci_dev *dev = child->self; | |
321 | u16 mem_base_lo, mem_limit_lo; | |
322 | unsigned long base, limit; | |
323 | struct resource *res; | |
1da177e4 LT |
324 | |
325 | res = child->resource[2]; | |
326 | pci_read_config_word(dev, PCI_PREF_MEMORY_BASE, &mem_base_lo); | |
327 | pci_read_config_word(dev, PCI_PREF_MEMORY_LIMIT, &mem_limit_lo); | |
328 | base = (mem_base_lo & PCI_PREF_RANGE_MASK) << 16; | |
329 | limit = (mem_limit_lo & PCI_PREF_RANGE_MASK) << 16; | |
330 | ||
331 | if ((mem_base_lo & PCI_PREF_RANGE_TYPE_MASK) == PCI_PREF_RANGE_TYPE_64) { | |
332 | u32 mem_base_hi, mem_limit_hi; | |
333 | pci_read_config_dword(dev, PCI_PREF_BASE_UPPER32, &mem_base_hi); | |
334 | pci_read_config_dword(dev, PCI_PREF_LIMIT_UPPER32, &mem_limit_hi); | |
335 | ||
336 | /* | |
337 | * Some bridges set the base > limit by default, and some | |
338 | * (broken) BIOSes do not initialize them. If we find | |
339 | * this, just assume they are not being used. | |
340 | */ | |
341 | if (mem_base_hi <= mem_limit_hi) { | |
342 | #if BITS_PER_LONG == 64 | |
343 | base |= ((long) mem_base_hi) << 32; | |
344 | limit |= ((long) mem_limit_hi) << 32; | |
345 | #else | |
346 | if (mem_base_hi || mem_limit_hi) { | |
80ccba11 BH |
347 | dev_err(&dev->dev, "can't handle 64-bit " |
348 | "address space for bridge\n"); | |
1da177e4 LT |
349 | return; |
350 | } | |
351 | #endif | |
352 | } | |
353 | } | |
cd81e1ea | 354 | if (base && base <= limit) { |
1f82de10 YL |
355 | res->flags = (mem_base_lo & PCI_PREF_RANGE_TYPE_MASK) | |
356 | IORESOURCE_MEM | IORESOURCE_PREFETCH; | |
357 | if (res->flags & PCI_PREF_RANGE_TYPE_64) | |
358 | res->flags |= IORESOURCE_MEM_64; | |
1da177e4 LT |
359 | res->start = base; |
360 | res->end = limit + 0xfffff; | |
c7dabef8 | 361 | dev_printk(KERN_DEBUG, &dev->dev, " bridge window %pR\n", res); |
cd81e1ea YL |
362 | } else { |
363 | dev_printk(KERN_DEBUG, &dev->dev, | |
7b8ff6da | 364 | " bridge window [mem %#010lx-%#010lx pref] (disabled)\n", |
cd81e1ea | 365 | base, limit + 0xfffff); |
1da177e4 LT |
366 | } |
367 | } | |
368 | ||
fa27b2d1 BH |
369 | void __devinit pci_read_bridge_bases(struct pci_bus *child) |
370 | { | |
371 | struct pci_dev *dev = child->self; | |
2fe2abf8 | 372 | struct resource *res; |
fa27b2d1 BH |
373 | int i; |
374 | ||
375 | if (pci_is_root_bus(child)) /* It's a host bus, nothing to read */ | |
376 | return; | |
377 | ||
378 | dev_info(&dev->dev, "PCI bridge to [bus %02x-%02x]%s\n", | |
379 | child->secondary, child->subordinate, | |
380 | dev->transparent ? " (subtractive decode)" : ""); | |
381 | ||
2fe2abf8 BH |
382 | pci_bus_remove_resources(child); |
383 | for (i = 0; i < PCI_BRIDGE_RESOURCE_NUM; i++) | |
384 | child->resource[i] = &dev->resource[PCI_BRIDGE_RESOURCES+i]; | |
385 | ||
fa27b2d1 BH |
386 | pci_read_bridge_io(child); |
387 | pci_read_bridge_mmio(child); | |
388 | pci_read_bridge_mmio_pref(child); | |
2adf7516 BH |
389 | |
390 | if (dev->transparent) { | |
2fe2abf8 BH |
391 | pci_bus_for_each_resource(child->parent, res, i) { |
392 | if (res) { | |
393 | pci_bus_add_resource(child, res, | |
394 | PCI_SUBTRACTIVE_DECODE); | |
2adf7516 BH |
395 | dev_printk(KERN_DEBUG, &dev->dev, |
396 | " bridge window %pR (subtractive decode)\n", | |
2fe2abf8 BH |
397 | res); |
398 | } | |
2adf7516 BH |
399 | } |
400 | } | |
fa27b2d1 BH |
401 | } |
402 | ||
96bde06a | 403 | static struct pci_bus * pci_alloc_bus(void) |
1da177e4 LT |
404 | { |
405 | struct pci_bus *b; | |
406 | ||
f5afe806 | 407 | b = kzalloc(sizeof(*b), GFP_KERNEL); |
1da177e4 | 408 | if (b) { |
1da177e4 LT |
409 | INIT_LIST_HEAD(&b->node); |
410 | INIT_LIST_HEAD(&b->children); | |
411 | INIT_LIST_HEAD(&b->devices); | |
f46753c5 | 412 | INIT_LIST_HEAD(&b->slots); |
2fe2abf8 | 413 | INIT_LIST_HEAD(&b->resources); |
3749c51a MW |
414 | b->max_bus_speed = PCI_SPEED_UNKNOWN; |
415 | b->cur_bus_speed = PCI_SPEED_UNKNOWN; | |
1da177e4 LT |
416 | } |
417 | return b; | |
418 | } | |
419 | ||
9be60ca0 MW |
420 | static unsigned char pcix_bus_speed[] = { |
421 | PCI_SPEED_UNKNOWN, /* 0 */ | |
422 | PCI_SPEED_66MHz_PCIX, /* 1 */ | |
423 | PCI_SPEED_100MHz_PCIX, /* 2 */ | |
424 | PCI_SPEED_133MHz_PCIX, /* 3 */ | |
425 | PCI_SPEED_UNKNOWN, /* 4 */ | |
426 | PCI_SPEED_66MHz_PCIX_ECC, /* 5 */ | |
427 | PCI_SPEED_100MHz_PCIX_ECC, /* 6 */ | |
428 | PCI_SPEED_133MHz_PCIX_ECC, /* 7 */ | |
429 | PCI_SPEED_UNKNOWN, /* 8 */ | |
430 | PCI_SPEED_66MHz_PCIX_266, /* 9 */ | |
431 | PCI_SPEED_100MHz_PCIX_266, /* A */ | |
432 | PCI_SPEED_133MHz_PCIX_266, /* B */ | |
433 | PCI_SPEED_UNKNOWN, /* C */ | |
434 | PCI_SPEED_66MHz_PCIX_533, /* D */ | |
435 | PCI_SPEED_100MHz_PCIX_533, /* E */ | |
436 | PCI_SPEED_133MHz_PCIX_533 /* F */ | |
437 | }; | |
438 | ||
3749c51a MW |
439 | static unsigned char pcie_link_speed[] = { |
440 | PCI_SPEED_UNKNOWN, /* 0 */ | |
441 | PCIE_SPEED_2_5GT, /* 1 */ | |
442 | PCIE_SPEED_5_0GT, /* 2 */ | |
9dfd97fe | 443 | PCIE_SPEED_8_0GT, /* 3 */ |
3749c51a MW |
444 | PCI_SPEED_UNKNOWN, /* 4 */ |
445 | PCI_SPEED_UNKNOWN, /* 5 */ | |
446 | PCI_SPEED_UNKNOWN, /* 6 */ | |
447 | PCI_SPEED_UNKNOWN, /* 7 */ | |
448 | PCI_SPEED_UNKNOWN, /* 8 */ | |
449 | PCI_SPEED_UNKNOWN, /* 9 */ | |
450 | PCI_SPEED_UNKNOWN, /* A */ | |
451 | PCI_SPEED_UNKNOWN, /* B */ | |
452 | PCI_SPEED_UNKNOWN, /* C */ | |
453 | PCI_SPEED_UNKNOWN, /* D */ | |
454 | PCI_SPEED_UNKNOWN, /* E */ | |
455 | PCI_SPEED_UNKNOWN /* F */ | |
456 | }; | |
457 | ||
458 | void pcie_update_link_speed(struct pci_bus *bus, u16 linksta) | |
459 | { | |
460 | bus->cur_bus_speed = pcie_link_speed[linksta & 0xf]; | |
461 | } | |
462 | EXPORT_SYMBOL_GPL(pcie_update_link_speed); | |
463 | ||
45b4cdd5 MW |
464 | static unsigned char agp_speeds[] = { |
465 | AGP_UNKNOWN, | |
466 | AGP_1X, | |
467 | AGP_2X, | |
468 | AGP_4X, | |
469 | AGP_8X | |
470 | }; | |
471 | ||
472 | static enum pci_bus_speed agp_speed(int agp3, int agpstat) | |
473 | { | |
474 | int index = 0; | |
475 | ||
476 | if (agpstat & 4) | |
477 | index = 3; | |
478 | else if (agpstat & 2) | |
479 | index = 2; | |
480 | else if (agpstat & 1) | |
481 | index = 1; | |
482 | else | |
483 | goto out; | |
484 | ||
485 | if (agp3) { | |
486 | index += 2; | |
487 | if (index == 5) | |
488 | index = 0; | |
489 | } | |
490 | ||
491 | out: | |
492 | return agp_speeds[index]; | |
493 | } | |
494 | ||
495 | ||
9be60ca0 MW |
496 | static void pci_set_bus_speed(struct pci_bus *bus) |
497 | { | |
498 | struct pci_dev *bridge = bus->self; | |
499 | int pos; | |
500 | ||
45b4cdd5 MW |
501 | pos = pci_find_capability(bridge, PCI_CAP_ID_AGP); |
502 | if (!pos) | |
503 | pos = pci_find_capability(bridge, PCI_CAP_ID_AGP3); | |
504 | if (pos) { | |
505 | u32 agpstat, agpcmd; | |
506 | ||
507 | pci_read_config_dword(bridge, pos + PCI_AGP_STATUS, &agpstat); | |
508 | bus->max_bus_speed = agp_speed(agpstat & 8, agpstat & 7); | |
509 | ||
510 | pci_read_config_dword(bridge, pos + PCI_AGP_COMMAND, &agpcmd); | |
511 | bus->cur_bus_speed = agp_speed(agpstat & 8, agpcmd & 7); | |
512 | } | |
513 | ||
9be60ca0 MW |
514 | pos = pci_find_capability(bridge, PCI_CAP_ID_PCIX); |
515 | if (pos) { | |
516 | u16 status; | |
517 | enum pci_bus_speed max; | |
518 | pci_read_config_word(bridge, pos + 2, &status); | |
519 | ||
520 | if (status & 0x8000) { | |
521 | max = PCI_SPEED_133MHz_PCIX_533; | |
522 | } else if (status & 0x4000) { | |
523 | max = PCI_SPEED_133MHz_PCIX_266; | |
524 | } else if (status & 0x0002) { | |
525 | if (((status >> 12) & 0x3) == 2) { | |
526 | max = PCI_SPEED_133MHz_PCIX_ECC; | |
527 | } else { | |
528 | max = PCI_SPEED_133MHz_PCIX; | |
529 | } | |
530 | } else { | |
531 | max = PCI_SPEED_66MHz_PCIX; | |
532 | } | |
533 | ||
534 | bus->max_bus_speed = max; | |
535 | bus->cur_bus_speed = pcix_bus_speed[(status >> 6) & 0xf]; | |
536 | ||
537 | return; | |
538 | } | |
539 | ||
540 | pos = pci_find_capability(bridge, PCI_CAP_ID_EXP); | |
541 | if (pos) { | |
542 | u32 linkcap; | |
543 | u16 linksta; | |
544 | ||
545 | pci_read_config_dword(bridge, pos + PCI_EXP_LNKCAP, &linkcap); | |
546 | bus->max_bus_speed = pcie_link_speed[linkcap & 0xf]; | |
547 | ||
548 | pci_read_config_word(bridge, pos + PCI_EXP_LNKSTA, &linksta); | |
549 | pcie_update_link_speed(bus, linksta); | |
550 | } | |
551 | } | |
552 | ||
553 | ||
cbd4e055 AB |
554 | static struct pci_bus *pci_alloc_child_bus(struct pci_bus *parent, |
555 | struct pci_dev *bridge, int busnr) | |
1da177e4 LT |
556 | { |
557 | struct pci_bus *child; | |
558 | int i; | |
559 | ||
560 | /* | |
561 | * Allocate a new bus, and inherit stuff from the parent.. | |
562 | */ | |
563 | child = pci_alloc_bus(); | |
564 | if (!child) | |
565 | return NULL; | |
566 | ||
1da177e4 LT |
567 | child->parent = parent; |
568 | child->ops = parent->ops; | |
569 | child->sysdata = parent->sysdata; | |
6e325a62 | 570 | child->bus_flags = parent->bus_flags; |
1da177e4 | 571 | |
fd7d1ced GKH |
572 | /* initialize some portions of the bus device, but don't register it |
573 | * now as the parent is not properly set up yet. This device will get | |
574 | * registered later in pci_bus_add_devices() | |
575 | */ | |
576 | child->dev.class = &pcibus_class; | |
1a927133 | 577 | dev_set_name(&child->dev, "%04x:%02x", pci_domain_nr(child), busnr); |
1da177e4 LT |
578 | |
579 | /* | |
580 | * Set up the primary, secondary and subordinate | |
581 | * bus numbers. | |
582 | */ | |
583 | child->number = child->secondary = busnr; | |
584 | child->primary = parent->secondary; | |
585 | child->subordinate = 0xff; | |
586 | ||
3789fa8a YZ |
587 | if (!bridge) |
588 | return child; | |
589 | ||
590 | child->self = bridge; | |
591 | child->bridge = get_device(&bridge->dev); | |
98d9f30c | 592 | pci_set_bus_of_node(child); |
9be60ca0 MW |
593 | pci_set_bus_speed(child); |
594 | ||
1da177e4 | 595 | /* Set up default resource pointers and names.. */ |
fde09c6d | 596 | for (i = 0; i < PCI_BRIDGE_RESOURCE_NUM; i++) { |
1da177e4 LT |
597 | child->resource[i] = &bridge->resource[PCI_BRIDGE_RESOURCES+i]; |
598 | child->resource[i]->name = child->name; | |
599 | } | |
600 | bridge->subordinate = child; | |
601 | ||
602 | return child; | |
603 | } | |
604 | ||
451124a7 | 605 | struct pci_bus *__ref pci_add_new_bus(struct pci_bus *parent, struct pci_dev *dev, int busnr) |
1da177e4 LT |
606 | { |
607 | struct pci_bus *child; | |
608 | ||
609 | child = pci_alloc_child_bus(parent, dev, busnr); | |
e4ea9bb7 | 610 | if (child) { |
d71374da | 611 | down_write(&pci_bus_sem); |
1da177e4 | 612 | list_add_tail(&child->node, &parent->children); |
d71374da | 613 | up_write(&pci_bus_sem); |
e4ea9bb7 | 614 | } |
1da177e4 LT |
615 | return child; |
616 | } | |
617 | ||
96bde06a | 618 | static void pci_fixup_parent_subordinate_busnr(struct pci_bus *child, int max) |
26f674ae GKH |
619 | { |
620 | struct pci_bus *parent = child->parent; | |
12f44f46 IK |
621 | |
622 | /* Attempts to fix that up are really dangerous unless | |
623 | we're going to re-assign all bus numbers. */ | |
624 | if (!pcibios_assign_all_busses()) | |
625 | return; | |
626 | ||
26f674ae GKH |
627 | while (parent->parent && parent->subordinate < max) { |
628 | parent->subordinate = max; | |
629 | pci_write_config_byte(parent->self, PCI_SUBORDINATE_BUS, max); | |
630 | parent = parent->parent; | |
631 | } | |
632 | } | |
633 | ||
1da177e4 LT |
634 | /* |
635 | * If it's a bridge, configure it and scan the bus behind it. | |
636 | * For CardBus bridges, we don't scan behind as the devices will | |
637 | * be handled by the bridge driver itself. | |
638 | * | |
639 | * We need to process bridges in two passes -- first we scan those | |
640 | * already configured by the BIOS and after we are done with all of | |
641 | * them, we proceed to assigning numbers to the remaining buses in | |
642 | * order to avoid overlaps between old and new bus numbers. | |
643 | */ | |
0ab2b57f | 644 | int __devinit pci_scan_bridge(struct pci_bus *bus, struct pci_dev *dev, int max, int pass) |
1da177e4 LT |
645 | { |
646 | struct pci_bus *child; | |
647 | int is_cardbus = (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS); | |
49887941 | 648 | u32 buses, i, j = 0; |
1da177e4 | 649 | u16 bctl; |
99ddd552 | 650 | u8 primary, secondary, subordinate; |
a1c19894 | 651 | int broken = 0; |
1da177e4 LT |
652 | |
653 | pci_read_config_dword(dev, PCI_PRIMARY_BUS, &buses); | |
99ddd552 BH |
654 | primary = buses & 0xFF; |
655 | secondary = (buses >> 8) & 0xFF; | |
656 | subordinate = (buses >> 16) & 0xFF; | |
1da177e4 | 657 | |
99ddd552 BH |
658 | dev_dbg(&dev->dev, "scanning [bus %02x-%02x] behind bridge, pass %d\n", |
659 | secondary, subordinate, pass); | |
1da177e4 | 660 | |
a1c19894 BH |
661 | /* Check if setup is sensible at all */ |
662 | if (!pass && | |
99ddd552 | 663 | (primary != bus->number || secondary <= bus->number)) { |
a1c19894 BH |
664 | dev_dbg(&dev->dev, "bus configuration invalid, reconfiguring\n"); |
665 | broken = 1; | |
666 | } | |
667 | ||
1da177e4 LT |
668 | /* Disable MasterAbortMode during probing to avoid reporting |
669 | of bus errors (in some architectures) */ | |
670 | pci_read_config_word(dev, PCI_BRIDGE_CONTROL, &bctl); | |
671 | pci_write_config_word(dev, PCI_BRIDGE_CONTROL, | |
672 | bctl & ~PCI_BRIDGE_CTL_MASTER_ABORT); | |
673 | ||
99ddd552 BH |
674 | if ((secondary || subordinate) && !pcibios_assign_all_busses() && |
675 | !is_cardbus && !broken) { | |
676 | unsigned int cmax; | |
1da177e4 LT |
677 | /* |
678 | * Bus already configured by firmware, process it in the first | |
679 | * pass and just note the configuration. | |
680 | */ | |
681 | if (pass) | |
bbe8f9a3 | 682 | goto out; |
1da177e4 LT |
683 | |
684 | /* | |
685 | * If we already got to this bus through a different bridge, | |
74710ded AC |
686 | * don't re-add it. This can happen with the i450NX chipset. |
687 | * | |
688 | * However, we continue to descend down the hierarchy and | |
689 | * scan remaining child buses. | |
1da177e4 | 690 | */ |
99ddd552 | 691 | child = pci_find_bus(pci_domain_nr(bus), secondary); |
74710ded | 692 | if (!child) { |
99ddd552 | 693 | child = pci_add_new_bus(bus, dev, secondary); |
74710ded AC |
694 | if (!child) |
695 | goto out; | |
99ddd552 BH |
696 | child->primary = primary; |
697 | child->subordinate = subordinate; | |
74710ded | 698 | child->bridge_ctl = bctl; |
1da177e4 LT |
699 | } |
700 | ||
1da177e4 LT |
701 | cmax = pci_scan_child_bus(child); |
702 | if (cmax > max) | |
703 | max = cmax; | |
704 | if (child->subordinate > max) | |
705 | max = child->subordinate; | |
706 | } else { | |
707 | /* | |
708 | * We need to assign a number to this bus which we always | |
709 | * do in the second pass. | |
710 | */ | |
12f44f46 | 711 | if (!pass) { |
a1c19894 | 712 | if (pcibios_assign_all_busses() || broken) |
12f44f46 IK |
713 | /* Temporarily disable forwarding of the |
714 | configuration cycles on all bridges in | |
715 | this bus segment to avoid possible | |
716 | conflicts in the second pass between two | |
717 | bridges programmed with overlapping | |
718 | bus ranges. */ | |
719 | pci_write_config_dword(dev, PCI_PRIMARY_BUS, | |
720 | buses & ~0xffffff); | |
bbe8f9a3 | 721 | goto out; |
12f44f46 | 722 | } |
1da177e4 LT |
723 | |
724 | /* Clear errors */ | |
725 | pci_write_config_word(dev, PCI_STATUS, 0xffff); | |
726 | ||
cc57450f RS |
727 | /* Prevent assigning a bus number that already exists. |
728 | * This can happen when a bridge is hot-plugged */ | |
729 | if (pci_find_bus(pci_domain_nr(bus), max+1)) | |
bbe8f9a3 | 730 | goto out; |
6ef6f0e3 | 731 | child = pci_add_new_bus(bus, dev, ++max); |
7c867c88 JJ |
732 | if (!child) |
733 | goto out; | |
1da177e4 LT |
734 | buses = (buses & 0xff000000) |
735 | | ((unsigned int)(child->primary) << 0) | |
736 | | ((unsigned int)(child->secondary) << 8) | |
737 | | ((unsigned int)(child->subordinate) << 16); | |
738 | ||
739 | /* | |
740 | * yenta.c forces a secondary latency timer of 176. | |
741 | * Copy that behaviour here. | |
742 | */ | |
743 | if (is_cardbus) { | |
744 | buses &= ~0xff000000; | |
745 | buses |= CARDBUS_LATENCY_TIMER << 24; | |
746 | } | |
7c867c88 | 747 | |
1da177e4 LT |
748 | /* |
749 | * We need to blast all three values with a single write. | |
750 | */ | |
751 | pci_write_config_dword(dev, PCI_PRIMARY_BUS, buses); | |
752 | ||
753 | if (!is_cardbus) { | |
11949255 | 754 | child->bridge_ctl = bctl; |
26f674ae GKH |
755 | /* |
756 | * Adjust subordinate busnr in parent buses. | |
757 | * We do this before scanning for children because | |
758 | * some devices may not be detected if the bios | |
759 | * was lazy. | |
760 | */ | |
761 | pci_fixup_parent_subordinate_busnr(child, max); | |
1da177e4 LT |
762 | /* Now we can scan all subordinate buses... */ |
763 | max = pci_scan_child_bus(child); | |
e3ac86d8 KA |
764 | /* |
765 | * now fix it up again since we have found | |
766 | * the real value of max. | |
767 | */ | |
768 | pci_fixup_parent_subordinate_busnr(child, max); | |
1da177e4 LT |
769 | } else { |
770 | /* | |
771 | * For CardBus bridges, we leave 4 bus numbers | |
772 | * as cards with a PCI-to-PCI bridge can be | |
773 | * inserted later. | |
774 | */ | |
49887941 DB |
775 | for (i=0; i<CARDBUS_RESERVE_BUSNR; i++) { |
776 | struct pci_bus *parent = bus; | |
cc57450f RS |
777 | if (pci_find_bus(pci_domain_nr(bus), |
778 | max+i+1)) | |
779 | break; | |
49887941 DB |
780 | while (parent->parent) { |
781 | if ((!pcibios_assign_all_busses()) && | |
782 | (parent->subordinate > max) && | |
783 | (parent->subordinate <= max+i)) { | |
784 | j = 1; | |
785 | } | |
786 | parent = parent->parent; | |
787 | } | |
788 | if (j) { | |
789 | /* | |
790 | * Often, there are two cardbus bridges | |
791 | * -- try to leave one valid bus number | |
792 | * for each one. | |
793 | */ | |
794 | i /= 2; | |
795 | break; | |
796 | } | |
797 | } | |
cc57450f | 798 | max += i; |
26f674ae | 799 | pci_fixup_parent_subordinate_busnr(child, max); |
1da177e4 LT |
800 | } |
801 | /* | |
802 | * Set the subordinate bus number to its real value. | |
803 | */ | |
804 | child->subordinate = max; | |
805 | pci_write_config_byte(dev, PCI_SUBORDINATE_BUS, max); | |
806 | } | |
807 | ||
cb3576fa GH |
808 | sprintf(child->name, |
809 | (is_cardbus ? "PCI CardBus %04x:%02x" : "PCI Bus %04x:%02x"), | |
810 | pci_domain_nr(bus), child->number); | |
1da177e4 | 811 | |
d55bef51 | 812 | /* Has only triggered on CardBus, fixup is in yenta_socket */ |
49887941 DB |
813 | while (bus->parent) { |
814 | if ((child->subordinate > bus->subordinate) || | |
815 | (child->number > bus->subordinate) || | |
816 | (child->number < bus->number) || | |
817 | (child->subordinate < bus->number)) { | |
865df576 BH |
818 | dev_info(&child->dev, "[bus %02x-%02x] %s " |
819 | "hidden behind%s bridge %s [bus %02x-%02x]\n", | |
d55bef51 BK |
820 | child->number, child->subordinate, |
821 | (bus->number > child->subordinate && | |
822 | bus->subordinate < child->number) ? | |
a6f29a98 JP |
823 | "wholly" : "partially", |
824 | bus->self->transparent ? " transparent" : "", | |
865df576 | 825 | dev_name(&bus->dev), |
d55bef51 | 826 | bus->number, bus->subordinate); |
49887941 DB |
827 | } |
828 | bus = bus->parent; | |
829 | } | |
830 | ||
bbe8f9a3 RB |
831 | out: |
832 | pci_write_config_word(dev, PCI_BRIDGE_CONTROL, bctl); | |
833 | ||
1da177e4 LT |
834 | return max; |
835 | } | |
836 | ||
837 | /* | |
838 | * Read interrupt line and base address registers. | |
839 | * The architecture-dependent code can tweak these, of course. | |
840 | */ | |
841 | static void pci_read_irq(struct pci_dev *dev) | |
842 | { | |
843 | unsigned char irq; | |
844 | ||
845 | pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &irq); | |
ffeff788 | 846 | dev->pin = irq; |
1da177e4 LT |
847 | if (irq) |
848 | pci_read_config_byte(dev, PCI_INTERRUPT_LINE, &irq); | |
849 | dev->irq = irq; | |
850 | } | |
851 | ||
bb209c82 | 852 | void set_pcie_port_type(struct pci_dev *pdev) |
480b93b7 YZ |
853 | { |
854 | int pos; | |
855 | u16 reg16; | |
856 | ||
857 | pos = pci_find_capability(pdev, PCI_CAP_ID_EXP); | |
858 | if (!pos) | |
859 | return; | |
860 | pdev->is_pcie = 1; | |
0efea000 | 861 | pdev->pcie_cap = pos; |
480b93b7 YZ |
862 | pci_read_config_word(pdev, pos + PCI_EXP_FLAGS, ®16); |
863 | pdev->pcie_type = (reg16 & PCI_EXP_FLAGS_TYPE) >> 4; | |
864 | } | |
865 | ||
bb209c82 | 866 | void set_pcie_hotplug_bridge(struct pci_dev *pdev) |
28760489 EB |
867 | { |
868 | int pos; | |
869 | u16 reg16; | |
870 | u32 reg32; | |
871 | ||
06a1cbaf | 872 | pos = pci_pcie_cap(pdev); |
28760489 EB |
873 | if (!pos) |
874 | return; | |
875 | pci_read_config_word(pdev, pos + PCI_EXP_FLAGS, ®16); | |
876 | if (!(reg16 & PCI_EXP_FLAGS_SLOT)) | |
877 | return; | |
878 | pci_read_config_dword(pdev, pos + PCI_EXP_SLTCAP, ®32); | |
879 | if (reg32 & PCI_EXP_SLTCAP_HPC) | |
880 | pdev->is_hotplug_bridge = 1; | |
881 | } | |
882 | ||
01abc2aa | 883 | #define LEGACY_IO_RESOURCE (IORESOURCE_IO | IORESOURCE_PCI_FIXED) |
76e6a1d6 | 884 | |
1da177e4 LT |
885 | /** |
886 | * pci_setup_device - fill in class and map information of a device | |
887 | * @dev: the device structure to fill | |
888 | * | |
889 | * Initialize the device structure with information about the device's | |
890 | * vendor,class,memory and IO-space addresses,IRQ lines etc. | |
891 | * Called at initialisation of the PCI subsystem and by CardBus services. | |
480b93b7 YZ |
892 | * Returns 0 on success and negative if unknown type of device (not normal, |
893 | * bridge or CardBus). | |
1da177e4 | 894 | */ |
480b93b7 | 895 | int pci_setup_device(struct pci_dev *dev) |
1da177e4 LT |
896 | { |
897 | u32 class; | |
480b93b7 YZ |
898 | u8 hdr_type; |
899 | struct pci_slot *slot; | |
bc577d2b | 900 | int pos = 0; |
480b93b7 YZ |
901 | |
902 | if (pci_read_config_byte(dev, PCI_HEADER_TYPE, &hdr_type)) | |
903 | return -EIO; | |
904 | ||
905 | dev->sysdata = dev->bus->sysdata; | |
906 | dev->dev.parent = dev->bus->bridge; | |
907 | dev->dev.bus = &pci_bus_type; | |
908 | dev->hdr_type = hdr_type & 0x7f; | |
909 | dev->multifunction = !!(hdr_type & 0x80); | |
480b93b7 YZ |
910 | dev->error_state = pci_channel_io_normal; |
911 | set_pcie_port_type(dev); | |
912 | ||
913 | list_for_each_entry(slot, &dev->bus->slots, list) | |
914 | if (PCI_SLOT(dev->devfn) == slot->number) | |
915 | dev->slot = slot; | |
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; | |
1da177e4 | 920 | |
eebfcfb5 GKH |
921 | dev_set_name(&dev->dev, "%04x:%02x:%02x.%d", pci_domain_nr(dev->bus), |
922 | dev->bus->number, PCI_SLOT(dev->devfn), | |
923 | PCI_FUNC(dev->devfn)); | |
1da177e4 LT |
924 | |
925 | pci_read_config_dword(dev, PCI_CLASS_REVISION, &class); | |
b8a3a521 | 926 | dev->revision = class & 0xff; |
1da177e4 LT |
927 | class >>= 8; /* upper 3 bytes */ |
928 | dev->class = class; | |
929 | class >>= 8; | |
930 | ||
2c6413ae BH |
931 | dev_printk(KERN_DEBUG, &dev->dev, "[%04x:%04x] type %d class %#08x\n", |
932 | dev->vendor, dev->device, dev->hdr_type, class); | |
1da177e4 | 933 | |
853346e4 YZ |
934 | /* need to have dev->class ready */ |
935 | dev->cfg_size = pci_cfg_space_size(dev); | |
936 | ||
1da177e4 | 937 | /* "Unknown power state" */ |
3fe9d19f | 938 | dev->current_state = PCI_UNKNOWN; |
1da177e4 LT |
939 | |
940 | /* Early fixups, before probing the BARs */ | |
941 | pci_fixup_device(pci_fixup_early, dev); | |
f79b1b14 YZ |
942 | /* device class may be changed after fixup */ |
943 | class = dev->class >> 8; | |
1da177e4 LT |
944 | |
945 | switch (dev->hdr_type) { /* header type */ | |
946 | case PCI_HEADER_TYPE_NORMAL: /* standard header */ | |
947 | if (class == PCI_CLASS_BRIDGE_PCI) | |
948 | goto bad; | |
949 | pci_read_irq(dev); | |
950 | pci_read_bases(dev, 6, PCI_ROM_ADDRESS); | |
951 | pci_read_config_word(dev, PCI_SUBSYSTEM_VENDOR_ID, &dev->subsystem_vendor); | |
952 | pci_read_config_word(dev, PCI_SUBSYSTEM_ID, &dev->subsystem_device); | |
368c73d4 AC |
953 | |
954 | /* | |
955 | * Do the ugly legacy mode stuff here rather than broken chip | |
956 | * quirk code. Legacy mode ATA controllers have fixed | |
957 | * addresses. These are not always echoed in BAR0-3, and | |
958 | * BAR0-3 in a few cases contain junk! | |
959 | */ | |
960 | if (class == PCI_CLASS_STORAGE_IDE) { | |
961 | u8 progif; | |
962 | pci_read_config_byte(dev, PCI_CLASS_PROG, &progif); | |
963 | if ((progif & 1) == 0) { | |
af1bff4f LT |
964 | dev->resource[0].start = 0x1F0; |
965 | dev->resource[0].end = 0x1F7; | |
966 | dev->resource[0].flags = LEGACY_IO_RESOURCE; | |
967 | dev->resource[1].start = 0x3F6; | |
968 | dev->resource[1].end = 0x3F6; | |
969 | dev->resource[1].flags = LEGACY_IO_RESOURCE; | |
368c73d4 AC |
970 | } |
971 | if ((progif & 4) == 0) { | |
af1bff4f LT |
972 | dev->resource[2].start = 0x170; |
973 | dev->resource[2].end = 0x177; | |
974 | dev->resource[2].flags = LEGACY_IO_RESOURCE; | |
975 | dev->resource[3].start = 0x376; | |
976 | dev->resource[3].end = 0x376; | |
977 | dev->resource[3].flags = LEGACY_IO_RESOURCE; | |
368c73d4 AC |
978 | } |
979 | } | |
1da177e4 LT |
980 | break; |
981 | ||
982 | case PCI_HEADER_TYPE_BRIDGE: /* bridge header */ | |
983 | if (class != PCI_CLASS_BRIDGE_PCI) | |
984 | goto bad; | |
985 | /* The PCI-to-PCI bridge spec requires that subtractive | |
986 | decoding (i.e. transparent) bridge must have programming | |
987 | interface code of 0x01. */ | |
3efd273b | 988 | pci_read_irq(dev); |
1da177e4 LT |
989 | dev->transparent = ((dev->class & 0xff) == 1); |
990 | pci_read_bases(dev, 2, PCI_ROM_ADDRESS1); | |
28760489 | 991 | set_pcie_hotplug_bridge(dev); |
bc577d2b GB |
992 | pos = pci_find_capability(dev, PCI_CAP_ID_SSVID); |
993 | if (pos) { | |
994 | pci_read_config_word(dev, pos + PCI_SSVID_VENDOR_ID, &dev->subsystem_vendor); | |
995 | pci_read_config_word(dev, pos + PCI_SSVID_DEVICE_ID, &dev->subsystem_device); | |
996 | } | |
1da177e4 LT |
997 | break; |
998 | ||
999 | case PCI_HEADER_TYPE_CARDBUS: /* CardBus bridge header */ | |
1000 | if (class != PCI_CLASS_BRIDGE_CARDBUS) | |
1001 | goto bad; | |
1002 | pci_read_irq(dev); | |
1003 | pci_read_bases(dev, 1, 0); | |
1004 | pci_read_config_word(dev, PCI_CB_SUBSYSTEM_VENDOR_ID, &dev->subsystem_vendor); | |
1005 | pci_read_config_word(dev, PCI_CB_SUBSYSTEM_ID, &dev->subsystem_device); | |
1006 | break; | |
1007 | ||
1008 | default: /* unknown header */ | |
80ccba11 BH |
1009 | dev_err(&dev->dev, "unknown header type %02x, " |
1010 | "ignoring device\n", dev->hdr_type); | |
480b93b7 | 1011 | return -EIO; |
1da177e4 LT |
1012 | |
1013 | bad: | |
80ccba11 BH |
1014 | dev_err(&dev->dev, "ignoring class %02x (doesn't match header " |
1015 | "type %02x)\n", class, dev->hdr_type); | |
1da177e4 LT |
1016 | dev->class = PCI_CLASS_NOT_DEFINED; |
1017 | } | |
1018 | ||
1019 | /* We found a fine healthy device, go go go... */ | |
1020 | return 0; | |
1021 | } | |
1022 | ||
201de56e ZY |
1023 | static void pci_release_capabilities(struct pci_dev *dev) |
1024 | { | |
1025 | pci_vpd_release(dev); | |
d1b054da | 1026 | pci_iov_release(dev); |
201de56e ZY |
1027 | } |
1028 | ||
1da177e4 LT |
1029 | /** |
1030 | * pci_release_dev - free a pci device structure when all users of it are finished. | |
1031 | * @dev: device that's been disconnected | |
1032 | * | |
1033 | * Will be called only by the device core when all users of this pci device are | |
1034 | * done. | |
1035 | */ | |
1036 | static void pci_release_dev(struct device *dev) | |
1037 | { | |
1038 | struct pci_dev *pci_dev; | |
1039 | ||
1040 | pci_dev = to_pci_dev(dev); | |
201de56e | 1041 | pci_release_capabilities(pci_dev); |
98d9f30c | 1042 | pci_release_of_node(pci_dev); |
1da177e4 LT |
1043 | kfree(pci_dev); |
1044 | } | |
1045 | ||
1046 | /** | |
1047 | * pci_cfg_space_size - get the configuration space size of the PCI device. | |
8f7020d3 | 1048 | * @dev: PCI device |
1da177e4 LT |
1049 | * |
1050 | * Regular PCI devices have 256 bytes, but PCI-X 2 and PCI Express devices | |
1051 | * have 4096 bytes. Even if the device is capable, that doesn't mean we can | |
1052 | * access it. Maybe we don't have a way to generate extended config space | |
1053 | * accesses, or the device is behind a reverse Express bridge. So we try | |
1054 | * reading the dword at 0x100 which must either be 0 or a valid extended | |
1055 | * capability header. | |
1056 | */ | |
70b9f7dc | 1057 | int pci_cfg_space_size_ext(struct pci_dev *dev) |
1da177e4 | 1058 | { |
1da177e4 | 1059 | u32 status; |
557848c3 | 1060 | int pos = PCI_CFG_SPACE_SIZE; |
1da177e4 | 1061 | |
557848c3 | 1062 | if (pci_read_config_dword(dev, pos, &status) != PCIBIOS_SUCCESSFUL) |
70b9f7dc YL |
1063 | goto fail; |
1064 | if (status == 0xffffffff) | |
1065 | goto fail; | |
1066 | ||
1067 | return PCI_CFG_SPACE_EXP_SIZE; | |
1068 | ||
1069 | fail: | |
1070 | return PCI_CFG_SPACE_SIZE; | |
1071 | } | |
1072 | ||
1073 | int pci_cfg_space_size(struct pci_dev *dev) | |
1074 | { | |
1075 | int pos; | |
1076 | u32 status; | |
dfadd9ed YL |
1077 | u16 class; |
1078 | ||
1079 | class = dev->class >> 8; | |
1080 | if (class == PCI_CLASS_BRIDGE_HOST) | |
1081 | return pci_cfg_space_size_ext(dev); | |
57741a77 | 1082 | |
06a1cbaf | 1083 | pos = pci_pcie_cap(dev); |
1da177e4 LT |
1084 | if (!pos) { |
1085 | pos = pci_find_capability(dev, PCI_CAP_ID_PCIX); | |
1086 | if (!pos) | |
1087 | goto fail; | |
1088 | ||
1089 | pci_read_config_dword(dev, pos + PCI_X_STATUS, &status); | |
1090 | if (!(status & (PCI_X_STATUS_266MHZ | PCI_X_STATUS_533MHZ))) | |
1091 | goto fail; | |
1092 | } | |
1093 | ||
70b9f7dc | 1094 | return pci_cfg_space_size_ext(dev); |
1da177e4 LT |
1095 | |
1096 | fail: | |
1097 | return PCI_CFG_SPACE_SIZE; | |
1098 | } | |
1099 | ||
1100 | static void pci_release_bus_bridge_dev(struct device *dev) | |
1101 | { | |
1102 | kfree(dev); | |
1103 | } | |
1104 | ||
65891215 ME |
1105 | struct pci_dev *alloc_pci_dev(void) |
1106 | { | |
1107 | struct pci_dev *dev; | |
1108 | ||
1109 | dev = kzalloc(sizeof(struct pci_dev), GFP_KERNEL); | |
1110 | if (!dev) | |
1111 | return NULL; | |
1112 | ||
65891215 ME |
1113 | INIT_LIST_HEAD(&dev->bus_list); |
1114 | ||
1115 | return dev; | |
1116 | } | |
1117 | EXPORT_SYMBOL(alloc_pci_dev); | |
1118 | ||
1da177e4 LT |
1119 | /* |
1120 | * Read the config data for a PCI device, sanity-check it | |
1121 | * and fill in the dev structure... | |
1122 | */ | |
7f7b5de2 | 1123 | static struct pci_dev *pci_scan_device(struct pci_bus *bus, int devfn) |
1da177e4 LT |
1124 | { |
1125 | struct pci_dev *dev; | |
1126 | u32 l; | |
1da177e4 LT |
1127 | int delay = 1; |
1128 | ||
1129 | if (pci_bus_read_config_dword(bus, devfn, PCI_VENDOR_ID, &l)) | |
1130 | return NULL; | |
1131 | ||
1132 | /* some broken boards return 0 or ~0 if a slot is empty: */ | |
1133 | if (l == 0xffffffff || l == 0x00000000 || | |
1134 | l == 0x0000ffff || l == 0xffff0000) | |
1135 | return NULL; | |
1136 | ||
1137 | /* Configuration request Retry Status */ | |
1138 | while (l == 0xffff0001) { | |
1139 | msleep(delay); | |
1140 | delay *= 2; | |
1141 | if (pci_bus_read_config_dword(bus, devfn, PCI_VENDOR_ID, &l)) | |
1142 | return NULL; | |
1143 | /* Card hasn't responded in 60 seconds? Must be stuck. */ | |
1144 | if (delay > 60 * 1000) { | |
80ccba11 | 1145 | printk(KERN_WARNING "pci %04x:%02x:%02x.%d: not " |
1da177e4 LT |
1146 | "responding\n", pci_domain_nr(bus), |
1147 | bus->number, PCI_SLOT(devfn), | |
1148 | PCI_FUNC(devfn)); | |
1149 | return NULL; | |
1150 | } | |
1151 | } | |
1152 | ||
bab41e9b | 1153 | dev = alloc_pci_dev(); |
1da177e4 LT |
1154 | if (!dev) |
1155 | return NULL; | |
1156 | ||
1da177e4 | 1157 | dev->bus = bus; |
1da177e4 | 1158 | dev->devfn = devfn; |
1da177e4 LT |
1159 | dev->vendor = l & 0xffff; |
1160 | dev->device = (l >> 16) & 0xffff; | |
cef354db | 1161 | |
98d9f30c BH |
1162 | pci_set_of_node(dev); |
1163 | ||
480b93b7 | 1164 | if (pci_setup_device(dev)) { |
1da177e4 LT |
1165 | kfree(dev); |
1166 | return NULL; | |
1167 | } | |
1da177e4 LT |
1168 | |
1169 | return dev; | |
1170 | } | |
1171 | ||
201de56e ZY |
1172 | static void pci_init_capabilities(struct pci_dev *dev) |
1173 | { | |
1174 | /* MSI/MSI-X list */ | |
1175 | pci_msi_init_pci_dev(dev); | |
1176 | ||
63f4898a RW |
1177 | /* Buffers for saving PCIe and PCI-X capabilities */ |
1178 | pci_allocate_cap_save_buffers(dev); | |
1179 | ||
201de56e ZY |
1180 | /* Power Management */ |
1181 | pci_pm_init(dev); | |
eb9c39d0 | 1182 | platform_pci_wakeup_init(dev); |
201de56e ZY |
1183 | |
1184 | /* Vital Product Data */ | |
1185 | pci_vpd_pci22_init(dev); | |
58c3a727 YZ |
1186 | |
1187 | /* Alternative Routing-ID Forwarding */ | |
1188 | pci_enable_ari(dev); | |
d1b054da YZ |
1189 | |
1190 | /* Single Root I/O Virtualization */ | |
1191 | pci_iov_init(dev); | |
ae21ee65 AK |
1192 | |
1193 | /* Enable ACS P2P upstream forwarding */ | |
5d990b62 | 1194 | pci_enable_acs(dev); |
201de56e ZY |
1195 | } |
1196 | ||
96bde06a | 1197 | void pci_device_add(struct pci_dev *dev, struct pci_bus *bus) |
1da177e4 | 1198 | { |
cdb9b9f7 PM |
1199 | device_initialize(&dev->dev); |
1200 | dev->dev.release = pci_release_dev; | |
1201 | pci_dev_get(dev); | |
1da177e4 | 1202 | |
cdb9b9f7 | 1203 | dev->dev.dma_mask = &dev->dma_mask; |
4d57cdfa | 1204 | dev->dev.dma_parms = &dev->dma_parms; |
cdb9b9f7 | 1205 | dev->dev.coherent_dma_mask = 0xffffffffull; |
1da177e4 | 1206 | |
4d57cdfa | 1207 | pci_set_dma_max_seg_size(dev, 65536); |
59fc67de | 1208 | pci_set_dma_seg_boundary(dev, 0xffffffff); |
4d57cdfa | 1209 | |
1da177e4 LT |
1210 | /* Fix up broken headers */ |
1211 | pci_fixup_device(pci_fixup_header, dev); | |
1212 | ||
4b77b0a2 RW |
1213 | /* Clear the state_saved flag. */ |
1214 | dev->state_saved = false; | |
1215 | ||
201de56e ZY |
1216 | /* Initialize various capabilities */ |
1217 | pci_init_capabilities(dev); | |
eb9d0fe4 | 1218 | |
1da177e4 LT |
1219 | /* |
1220 | * Add the device to our list of discovered devices | |
1221 | * and the bus list for fixup functions, etc. | |
1222 | */ | |
d71374da | 1223 | down_write(&pci_bus_sem); |
1da177e4 | 1224 | list_add_tail(&dev->bus_list, &bus->devices); |
d71374da | 1225 | up_write(&pci_bus_sem); |
cdb9b9f7 PM |
1226 | } |
1227 | ||
451124a7 | 1228 | struct pci_dev *__ref pci_scan_single_device(struct pci_bus *bus, int devfn) |
cdb9b9f7 PM |
1229 | { |
1230 | struct pci_dev *dev; | |
1231 | ||
90bdb311 TP |
1232 | dev = pci_get_slot(bus, devfn); |
1233 | if (dev) { | |
1234 | pci_dev_put(dev); | |
1235 | return dev; | |
1236 | } | |
1237 | ||
cdb9b9f7 PM |
1238 | dev = pci_scan_device(bus, devfn); |
1239 | if (!dev) | |
1240 | return NULL; | |
1241 | ||
1242 | pci_device_add(dev, bus); | |
1da177e4 LT |
1243 | |
1244 | return dev; | |
1245 | } | |
b73e9687 | 1246 | EXPORT_SYMBOL(pci_scan_single_device); |
1da177e4 | 1247 | |
f07852d6 MW |
1248 | static unsigned next_ari_fn(struct pci_dev *dev, unsigned fn) |
1249 | { | |
1250 | u16 cap; | |
4fb88c1a MW |
1251 | unsigned pos, next_fn; |
1252 | ||
1253 | if (!dev) | |
1254 | return 0; | |
1255 | ||
1256 | pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ARI); | |
f07852d6 MW |
1257 | if (!pos) |
1258 | return 0; | |
1259 | pci_read_config_word(dev, pos + 4, &cap); | |
4fb88c1a MW |
1260 | next_fn = cap >> 8; |
1261 | if (next_fn <= fn) | |
1262 | return 0; | |
1263 | return next_fn; | |
f07852d6 MW |
1264 | } |
1265 | ||
1266 | static unsigned next_trad_fn(struct pci_dev *dev, unsigned fn) | |
1267 | { | |
1268 | return (fn + 1) % 8; | |
1269 | } | |
1270 | ||
1271 | static unsigned no_next_fn(struct pci_dev *dev, unsigned fn) | |
1272 | { | |
1273 | return 0; | |
1274 | } | |
1275 | ||
1276 | static int only_one_child(struct pci_bus *bus) | |
1277 | { | |
1278 | struct pci_dev *parent = bus->self; | |
1279 | if (!parent || !pci_is_pcie(parent)) | |
1280 | return 0; | |
1281 | if (parent->pcie_type == PCI_EXP_TYPE_ROOT_PORT || | |
1282 | parent->pcie_type == PCI_EXP_TYPE_DOWNSTREAM) | |
1283 | return 1; | |
1284 | return 0; | |
1285 | } | |
1286 | ||
1da177e4 LT |
1287 | /** |
1288 | * pci_scan_slot - scan a PCI slot on a bus for devices. | |
1289 | * @bus: PCI bus to scan | |
1290 | * @devfn: slot number to scan (must have zero function.) | |
1291 | * | |
1292 | * Scan a PCI slot on the specified PCI bus for devices, adding | |
1293 | * discovered devices to the @bus->devices list. New devices | |
8a1bc901 | 1294 | * will not have is_added set. |
1b69dfc6 TP |
1295 | * |
1296 | * Returns the number of new devices found. | |
1da177e4 | 1297 | */ |
96bde06a | 1298 | int pci_scan_slot(struct pci_bus *bus, int devfn) |
1da177e4 | 1299 | { |
f07852d6 | 1300 | unsigned fn, nr = 0; |
1b69dfc6 | 1301 | struct pci_dev *dev; |
f07852d6 MW |
1302 | unsigned (*next_fn)(struct pci_dev *, unsigned) = no_next_fn; |
1303 | ||
1304 | if (only_one_child(bus) && (devfn > 0)) | |
1305 | return 0; /* Already scanned the entire slot */ | |
1da177e4 | 1306 | |
1b69dfc6 | 1307 | dev = pci_scan_single_device(bus, devfn); |
4fb88c1a MW |
1308 | if (!dev) |
1309 | return 0; | |
1310 | if (!dev->is_added) | |
1b69dfc6 TP |
1311 | nr++; |
1312 | ||
f07852d6 MW |
1313 | if (pci_ari_enabled(bus)) |
1314 | next_fn = next_ari_fn; | |
4fb88c1a | 1315 | else if (dev->multifunction) |
f07852d6 MW |
1316 | next_fn = next_trad_fn; |
1317 | ||
1318 | for (fn = next_fn(dev, 0); fn > 0; fn = next_fn(dev, fn)) { | |
1319 | dev = pci_scan_single_device(bus, devfn + fn); | |
1320 | if (dev) { | |
1321 | if (!dev->is_added) | |
1322 | nr++; | |
1323 | dev->multifunction = 1; | |
1da177e4 LT |
1324 | } |
1325 | } | |
7d715a6c | 1326 | |
149e1637 SL |
1327 | /* only one slot has pcie device */ |
1328 | if (bus->self && nr) | |
7d715a6c SL |
1329 | pcie_aspm_init_link_state(bus->self); |
1330 | ||
1da177e4 LT |
1331 | return nr; |
1332 | } | |
1333 | ||
0ab2b57f | 1334 | unsigned int __devinit pci_scan_child_bus(struct pci_bus *bus) |
1da177e4 LT |
1335 | { |
1336 | unsigned int devfn, pass, max = bus->secondary; | |
1337 | struct pci_dev *dev; | |
1338 | ||
0207c356 | 1339 | dev_dbg(&bus->dev, "scanning bus\n"); |
1da177e4 LT |
1340 | |
1341 | /* Go find them, Rover! */ | |
1342 | for (devfn = 0; devfn < 0x100; devfn += 8) | |
1343 | pci_scan_slot(bus, devfn); | |
1344 | ||
a28724b0 YZ |
1345 | /* Reserve buses for SR-IOV capability. */ |
1346 | max += pci_iov_bus_range(bus); | |
1347 | ||
1da177e4 LT |
1348 | /* |
1349 | * After performing arch-dependent fixup of the bus, look behind | |
1350 | * all PCI-to-PCI bridges on this bus. | |
1351 | */ | |
74710ded | 1352 | if (!bus->is_added) { |
0207c356 | 1353 | dev_dbg(&bus->dev, "fixups for bus\n"); |
74710ded AC |
1354 | pcibios_fixup_bus(bus); |
1355 | if (pci_is_root_bus(bus)) | |
1356 | bus->is_added = 1; | |
1357 | } | |
1358 | ||
1da177e4 LT |
1359 | for (pass=0; pass < 2; pass++) |
1360 | list_for_each_entry(dev, &bus->devices, bus_list) { | |
1361 | if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE || | |
1362 | dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) | |
1363 | max = pci_scan_bridge(bus, dev, max, pass); | |
1364 | } | |
1365 | ||
1366 | /* | |
1367 | * We've scanned the bus and so we know all about what's on | |
1368 | * the other side of any bridges that may be on this bus plus | |
1369 | * any devices. | |
1370 | * | |
1371 | * Return how far we've got finding sub-buses. | |
1372 | */ | |
0207c356 | 1373 | dev_dbg(&bus->dev, "bus scan returning with max=%02x\n", max); |
1da177e4 LT |
1374 | return max; |
1375 | } | |
1376 | ||
96bde06a | 1377 | struct pci_bus * pci_create_bus(struct device *parent, |
cdb9b9f7 | 1378 | int bus, struct pci_ops *ops, void *sysdata) |
1da177e4 LT |
1379 | { |
1380 | int error; | |
0207c356 | 1381 | struct pci_bus *b, *b2; |
1da177e4 LT |
1382 | struct device *dev; |
1383 | ||
1384 | b = pci_alloc_bus(); | |
1385 | if (!b) | |
1386 | return NULL; | |
1387 | ||
6a3b3e26 | 1388 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); |
1da177e4 LT |
1389 | if (!dev){ |
1390 | kfree(b); | |
1391 | return NULL; | |
1392 | } | |
1393 | ||
1394 | b->sysdata = sysdata; | |
1395 | b->ops = ops; | |
1396 | ||
0207c356 BH |
1397 | b2 = pci_find_bus(pci_domain_nr(b), bus); |
1398 | if (b2) { | |
1da177e4 | 1399 | /* If we already got to this bus through a different bridge, ignore it */ |
0207c356 | 1400 | dev_dbg(&b2->dev, "bus already known\n"); |
1da177e4 LT |
1401 | goto err_out; |
1402 | } | |
d71374da ZY |
1403 | |
1404 | down_write(&pci_bus_sem); | |
1da177e4 | 1405 | list_add_tail(&b->node, &pci_root_buses); |
d71374da | 1406 | up_write(&pci_bus_sem); |
1da177e4 | 1407 | |
1da177e4 LT |
1408 | dev->parent = parent; |
1409 | dev->release = pci_release_bus_bridge_dev; | |
1a927133 | 1410 | dev_set_name(dev, "pci%04x:%02x", pci_domain_nr(b), bus); |
1da177e4 LT |
1411 | error = device_register(dev); |
1412 | if (error) | |
1413 | goto dev_reg_err; | |
1414 | b->bridge = get_device(dev); | |
a1e4d72c | 1415 | device_enable_async_suspend(b->bridge); |
98d9f30c | 1416 | pci_set_bus_of_node(b); |
1da177e4 | 1417 | |
0d358f22 YL |
1418 | if (!parent) |
1419 | set_dev_node(b->bridge, pcibus_to_node(b)); | |
1420 | ||
fd7d1ced GKH |
1421 | b->dev.class = &pcibus_class; |
1422 | b->dev.parent = b->bridge; | |
1a927133 | 1423 | dev_set_name(&b->dev, "%04x:%02x", pci_domain_nr(b), bus); |
fd7d1ced | 1424 | error = device_register(&b->dev); |
1da177e4 LT |
1425 | if (error) |
1426 | goto class_dev_reg_err; | |
1da177e4 LT |
1427 | |
1428 | /* Create legacy_io and legacy_mem files for this bus */ | |
1429 | pci_create_legacy_files(b); | |
1430 | ||
1da177e4 LT |
1431 | b->number = b->secondary = bus; |
1432 | b->resource[0] = &ioport_resource; | |
1433 | b->resource[1] = &iomem_resource; | |
1434 | ||
1da177e4 LT |
1435 | return b; |
1436 | ||
1da177e4 LT |
1437 | class_dev_reg_err: |
1438 | device_unregister(dev); | |
1439 | dev_reg_err: | |
d71374da | 1440 | down_write(&pci_bus_sem); |
1da177e4 | 1441 | list_del(&b->node); |
d71374da | 1442 | up_write(&pci_bus_sem); |
1da177e4 LT |
1443 | err_out: |
1444 | kfree(dev); | |
1445 | kfree(b); | |
1446 | return NULL; | |
1447 | } | |
cdb9b9f7 | 1448 | |
0ab2b57f | 1449 | struct pci_bus * __devinit pci_scan_bus_parented(struct device *parent, |
cdb9b9f7 PM |
1450 | int bus, struct pci_ops *ops, void *sysdata) |
1451 | { | |
1452 | struct pci_bus *b; | |
1453 | ||
1454 | b = pci_create_bus(parent, bus, ops, sysdata); | |
1455 | if (b) | |
1456 | b->subordinate = pci_scan_child_bus(b); | |
1457 | return b; | |
1458 | } | |
1da177e4 LT |
1459 | EXPORT_SYMBOL(pci_scan_bus_parented); |
1460 | ||
1461 | #ifdef CONFIG_HOTPLUG | |
3ed4fd96 AC |
1462 | /** |
1463 | * pci_rescan_bus - scan a PCI bus for devices. | |
1464 | * @bus: PCI bus to scan | |
1465 | * | |
1466 | * Scan a PCI bus and child buses for new devices, adds them, | |
1467 | * and enables them. | |
1468 | * | |
1469 | * Returns the max number of subordinate bus discovered. | |
1470 | */ | |
5446a6bd | 1471 | unsigned int __ref pci_rescan_bus(struct pci_bus *bus) |
3ed4fd96 AC |
1472 | { |
1473 | unsigned int max; | |
1474 | struct pci_dev *dev; | |
1475 | ||
1476 | max = pci_scan_child_bus(bus); | |
1477 | ||
705b1aaa | 1478 | down_read(&pci_bus_sem); |
3ed4fd96 AC |
1479 | list_for_each_entry(dev, &bus->devices, bus_list) |
1480 | if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE || | |
1481 | dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) | |
1482 | if (dev->subordinate) | |
1483 | pci_bus_size_bridges(dev->subordinate); | |
705b1aaa | 1484 | up_read(&pci_bus_sem); |
3ed4fd96 AC |
1485 | |
1486 | pci_bus_assign_resources(bus); | |
1487 | pci_enable_bridges(bus); | |
1488 | pci_bus_add_devices(bus); | |
1489 | ||
1490 | return max; | |
1491 | } | |
1492 | EXPORT_SYMBOL_GPL(pci_rescan_bus); | |
1493 | ||
1da177e4 | 1494 | EXPORT_SYMBOL(pci_add_new_bus); |
1da177e4 LT |
1495 | EXPORT_SYMBOL(pci_scan_slot); |
1496 | EXPORT_SYMBOL(pci_scan_bridge); | |
1da177e4 LT |
1497 | EXPORT_SYMBOL_GPL(pci_scan_child_bus); |
1498 | #endif | |
6b4b78fe | 1499 | |
99178b03 | 1500 | static int __init pci_sort_bf_cmp(const struct device *d_a, const struct device *d_b) |
6b4b78fe | 1501 | { |
99178b03 GKH |
1502 | const struct pci_dev *a = to_pci_dev(d_a); |
1503 | const struct pci_dev *b = to_pci_dev(d_b); | |
1504 | ||
6b4b78fe MD |
1505 | if (pci_domain_nr(a->bus) < pci_domain_nr(b->bus)) return -1; |
1506 | else if (pci_domain_nr(a->bus) > pci_domain_nr(b->bus)) return 1; | |
1507 | ||
1508 | if (a->bus->number < b->bus->number) return -1; | |
1509 | else if (a->bus->number > b->bus->number) return 1; | |
1510 | ||
1511 | if (a->devfn < b->devfn) return -1; | |
1512 | else if (a->devfn > b->devfn) return 1; | |
1513 | ||
1514 | return 0; | |
1515 | } | |
1516 | ||
5ff580c1 | 1517 | void __init pci_sort_breadthfirst(void) |
6b4b78fe | 1518 | { |
99178b03 | 1519 | bus_sort_breadthfirst(&pci_bus_type, &pci_sort_bf_cmp); |
6b4b78fe | 1520 | } |