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Commit | Line | Data |
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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> | |
12 | #include <linux/pci-aspm.h> | |
13 | #include "pci.h" | |
14 | ||
15 | #define CARDBUS_LATENCY_TIMER 176 /* secondary latency timer */ | |
16 | #define CARDBUS_RESERVE_BUSNR 3 | |
17 | ||
18 | /* Ugh. Need to stop exporting this to modules. */ | |
19 | LIST_HEAD(pci_root_buses); | |
20 | EXPORT_SYMBOL(pci_root_buses); | |
21 | ||
22 | ||
23 | static int find_anything(struct device *dev, void *data) | |
24 | { | |
25 | return 1; | |
26 | } | |
27 | ||
28 | /* | |
29 | * Some device drivers need know if pci is initiated. | |
30 | * Basically, we think pci is not initiated when there | |
31 | * is no device to be found on the pci_bus_type. | |
32 | */ | |
33 | int no_pci_devices(void) | |
34 | { | |
35 | struct device *dev; | |
36 | int no_devices; | |
37 | ||
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 | } | |
43 | EXPORT_SYMBOL(no_pci_devices); | |
44 | ||
45 | /* | |
46 | * PCI Bus Class | |
47 | */ | |
48 | static void release_pcibus_dev(struct device *dev) | |
49 | { | |
50 | struct pci_bus *pci_bus = to_pci_bus(dev); | |
51 | ||
52 | if (pci_bus->bridge) | |
53 | put_device(pci_bus->bridge); | |
54 | pci_bus_remove_resources(pci_bus); | |
55 | kfree(pci_bus); | |
56 | } | |
57 | ||
58 | static struct class pcibus_class = { | |
59 | .name = "pci_bus", | |
60 | .dev_release = &release_pcibus_dev, | |
61 | .dev_attrs = pcibus_dev_attrs, | |
62 | }; | |
63 | ||
64 | static int __init pcibus_class_init(void) | |
65 | { | |
66 | return class_register(&pcibus_class); | |
67 | } | |
68 | postcore_initcall(pcibus_class_init); | |
69 | ||
70 | /* | |
71 | * Translate the low bits of the PCI base | |
72 | * to the resource type | |
73 | */ | |
74 | static inline unsigned int pci_calc_resource_flags(unsigned int flags) | |
75 | { | |
76 | if (flags & PCI_BASE_ADDRESS_SPACE_IO) | |
77 | return IORESOURCE_IO; | |
78 | ||
79 | if (flags & PCI_BASE_ADDRESS_MEM_PREFETCH) | |
80 | return IORESOURCE_MEM | IORESOURCE_PREFETCH; | |
81 | ||
82 | return IORESOURCE_MEM; | |
83 | } | |
84 | ||
85 | static u64 pci_size(u64 base, u64 maxbase, u64 mask) | |
86 | { | |
87 | u64 size = mask & maxbase; /* Find the significant bits */ | |
88 | if (!size) | |
89 | return 0; | |
90 | ||
91 | /* Get the lowest of them to find the decode size, and | |
92 | from that the extent. */ | |
93 | size = (size & ~(size-1)) - 1; | |
94 | ||
95 | /* base == maxbase can be valid only if the BAR has | |
96 | already been programmed with all 1s. */ | |
97 | if (base == maxbase && ((base | size) & mask) != mask) | |
98 | return 0; | |
99 | ||
100 | return size; | |
101 | } | |
102 | ||
103 | static inline enum pci_bar_type decode_bar(struct resource *res, u32 bar) | |
104 | { | |
105 | if ((bar & PCI_BASE_ADDRESS_SPACE) == PCI_BASE_ADDRESS_SPACE_IO) { | |
106 | res->flags = bar & ~PCI_BASE_ADDRESS_IO_MASK; | |
107 | return pci_bar_io; | |
108 | } | |
109 | ||
110 | res->flags = bar & ~PCI_BASE_ADDRESS_MEM_MASK; | |
111 | ||
112 | if (res->flags & PCI_BASE_ADDRESS_MEM_TYPE_64) | |
113 | return pci_bar_mem64; | |
114 | return pci_bar_mem32; | |
115 | } | |
116 | ||
117 | /** | |
118 | * pci_read_base - read a PCI BAR | |
119 | * @dev: the PCI device | |
120 | * @type: type of the BAR | |
121 | * @res: resource buffer to be filled in | |
122 | * @pos: BAR position in the config space | |
123 | * | |
124 | * Returns 1 if the BAR is 64-bit, or 0 if 32-bit. | |
125 | */ | |
126 | int __pci_read_base(struct pci_dev *dev, enum pci_bar_type type, | |
127 | struct resource *res, unsigned int pos) | |
128 | { | |
129 | u32 l, sz, mask; | |
130 | u16 orig_cmd; | |
131 | ||
132 | mask = type ? PCI_ROM_ADDRESS_MASK : ~0; | |
133 | ||
134 | if (!dev->mmio_always_on) { | |
135 | pci_read_config_word(dev, PCI_COMMAND, &orig_cmd); | |
136 | pci_write_config_word(dev, PCI_COMMAND, | |
137 | orig_cmd & ~(PCI_COMMAND_MEMORY | PCI_COMMAND_IO)); | |
138 | } | |
139 | ||
140 | res->name = pci_name(dev); | |
141 | ||
142 | pci_read_config_dword(dev, pos, &l); | |
143 | pci_write_config_dword(dev, pos, l | mask); | |
144 | pci_read_config_dword(dev, pos, &sz); | |
145 | pci_write_config_dword(dev, pos, l); | |
146 | ||
147 | if (!dev->mmio_always_on) | |
148 | pci_write_config_word(dev, PCI_COMMAND, orig_cmd); | |
149 | ||
150 | /* | |
151 | * All bits set in sz means the device isn't working properly. | |
152 | * If the BAR isn't implemented, all bits must be 0. If it's a | |
153 | * memory BAR or a ROM, bit 0 must be clear; if it's an io BAR, bit | |
154 | * 1 must be clear. | |
155 | */ | |
156 | if (!sz || sz == 0xffffffff) | |
157 | goto fail; | |
158 | ||
159 | /* | |
160 | * I don't know how l can have all bits set. Copied from old code. | |
161 | * Maybe it fixes a bug on some ancient platform. | |
162 | */ | |
163 | if (l == 0xffffffff) | |
164 | l = 0; | |
165 | ||
166 | if (type == pci_bar_unknown) { | |
167 | type = decode_bar(res, l); | |
168 | res->flags |= pci_calc_resource_flags(l) | IORESOURCE_SIZEALIGN; | |
169 | if (type == pci_bar_io) { | |
170 | l &= PCI_BASE_ADDRESS_IO_MASK; | |
171 | mask = PCI_BASE_ADDRESS_IO_MASK & (u32) IO_SPACE_LIMIT; | |
172 | } else { | |
173 | l &= PCI_BASE_ADDRESS_MEM_MASK; | |
174 | mask = (u32)PCI_BASE_ADDRESS_MEM_MASK; | |
175 | } | |
176 | } else { | |
177 | res->flags |= (l & IORESOURCE_ROM_ENABLE); | |
178 | l &= PCI_ROM_ADDRESS_MASK; | |
179 | mask = (u32)PCI_ROM_ADDRESS_MASK; | |
180 | } | |
181 | ||
182 | if (type == pci_bar_mem64) { | |
183 | u64 l64 = l; | |
184 | u64 sz64 = sz; | |
185 | u64 mask64 = mask | (u64)~0 << 32; | |
186 | ||
187 | pci_read_config_dword(dev, pos + 4, &l); | |
188 | pci_write_config_dword(dev, pos + 4, ~0); | |
189 | pci_read_config_dword(dev, pos + 4, &sz); | |
190 | pci_write_config_dword(dev, pos + 4, l); | |
191 | ||
192 | l64 |= ((u64)l << 32); | |
193 | sz64 |= ((u64)sz << 32); | |
194 | ||
195 | sz64 = pci_size(l64, sz64, mask64); | |
196 | ||
197 | if (!sz64) | |
198 | goto fail; | |
199 | ||
200 | if ((sizeof(resource_size_t) < 8) && (sz64 > 0x100000000ULL)) { | |
201 | dev_err(&dev->dev, "reg %x: can't handle 64-bit BAR\n", | |
202 | pos); | |
203 | goto fail; | |
204 | } | |
205 | ||
206 | res->flags |= IORESOURCE_MEM_64; | |
207 | if ((sizeof(resource_size_t) < 8) && l) { | |
208 | /* Address above 32-bit boundary; disable the BAR */ | |
209 | pci_write_config_dword(dev, pos, 0); | |
210 | pci_write_config_dword(dev, pos + 4, 0); | |
211 | res->start = 0; | |
212 | res->end = sz64; | |
213 | } else { | |
214 | res->start = l64; | |
215 | res->end = l64 + sz64; | |
216 | dev_printk(KERN_DEBUG, &dev->dev, "reg %x: %pR\n", | |
217 | pos, res); | |
218 | } | |
219 | } else { | |
220 | sz = pci_size(l, sz, mask); | |
221 | ||
222 | if (!sz) | |
223 | goto fail; | |
224 | ||
225 | res->start = l; | |
226 | res->end = l + sz; | |
227 | ||
228 | dev_printk(KERN_DEBUG, &dev->dev, "reg %x: %pR\n", pos, res); | |
229 | } | |
230 | ||
231 | out: | |
232 | return (type == pci_bar_mem64) ? 1 : 0; | |
233 | fail: | |
234 | res->flags = 0; | |
235 | goto out; | |
236 | } | |
237 | ||
238 | static void pci_read_bases(struct pci_dev *dev, unsigned int howmany, int rom) | |
239 | { | |
240 | unsigned int pos, reg; | |
241 | ||
242 | for (pos = 0; pos < howmany; pos++) { | |
243 | struct resource *res = &dev->resource[pos]; | |
244 | reg = PCI_BASE_ADDRESS_0 + (pos << 2); | |
245 | pos += __pci_read_base(dev, pci_bar_unknown, res, reg); | |
246 | } | |
247 | ||
248 | if (rom) { | |
249 | struct resource *res = &dev->resource[PCI_ROM_RESOURCE]; | |
250 | dev->rom_base_reg = rom; | |
251 | res->flags = IORESOURCE_MEM | IORESOURCE_PREFETCH | | |
252 | IORESOURCE_READONLY | IORESOURCE_CACHEABLE | | |
253 | IORESOURCE_SIZEALIGN; | |
254 | __pci_read_base(dev, pci_bar_mem32, res, rom); | |
255 | } | |
256 | } | |
257 | ||
258 | static void __devinit pci_read_bridge_io(struct pci_bus *child) | |
259 | { | |
260 | struct pci_dev *dev = child->self; | |
261 | u8 io_base_lo, io_limit_lo; | |
262 | unsigned long base, limit; | |
263 | struct resource *res; | |
264 | ||
265 | res = child->resource[0]; | |
266 | pci_read_config_byte(dev, PCI_IO_BASE, &io_base_lo); | |
267 | pci_read_config_byte(dev, PCI_IO_LIMIT, &io_limit_lo); | |
268 | base = (io_base_lo & PCI_IO_RANGE_MASK) << 8; | |
269 | limit = (io_limit_lo & PCI_IO_RANGE_MASK) << 8; | |
270 | ||
271 | if ((io_base_lo & PCI_IO_RANGE_TYPE_MASK) == PCI_IO_RANGE_TYPE_32) { | |
272 | u16 io_base_hi, io_limit_hi; | |
273 | pci_read_config_word(dev, PCI_IO_BASE_UPPER16, &io_base_hi); | |
274 | pci_read_config_word(dev, PCI_IO_LIMIT_UPPER16, &io_limit_hi); | |
275 | base |= (io_base_hi << 16); | |
276 | limit |= (io_limit_hi << 16); | |
277 | } | |
278 | ||
279 | if (base && base <= limit) { | |
280 | res->flags = (io_base_lo & PCI_IO_RANGE_TYPE_MASK) | IORESOURCE_IO; | |
281 | if (!res->start) | |
282 | res->start = base; | |
283 | if (!res->end) | |
284 | res->end = limit + 0xfff; | |
285 | dev_printk(KERN_DEBUG, &dev->dev, " bridge window %pR\n", res); | |
286 | } else { | |
287 | dev_printk(KERN_DEBUG, &dev->dev, | |
288 | " bridge window [io %#06lx-%#06lx] (disabled)\n", | |
289 | base, limit); | |
290 | } | |
291 | } | |
292 | ||
293 | static void __devinit pci_read_bridge_mmio(struct pci_bus *child) | |
294 | { | |
295 | struct pci_dev *dev = child->self; | |
296 | u16 mem_base_lo, mem_limit_lo; | |
297 | unsigned long base, limit; | |
298 | struct resource *res; | |
299 | ||
300 | res = child->resource[1]; | |
301 | pci_read_config_word(dev, PCI_MEMORY_BASE, &mem_base_lo); | |
302 | pci_read_config_word(dev, PCI_MEMORY_LIMIT, &mem_limit_lo); | |
303 | base = (mem_base_lo & PCI_MEMORY_RANGE_MASK) << 16; | |
304 | limit = (mem_limit_lo & PCI_MEMORY_RANGE_MASK) << 16; | |
305 | if (base && base <= limit) { | |
306 | res->flags = (mem_base_lo & PCI_MEMORY_RANGE_TYPE_MASK) | IORESOURCE_MEM; | |
307 | res->start = base; | |
308 | res->end = limit + 0xfffff; | |
309 | dev_printk(KERN_DEBUG, &dev->dev, " bridge window %pR\n", res); | |
310 | } else { | |
311 | dev_printk(KERN_DEBUG, &dev->dev, | |
312 | " bridge window [mem %#010lx-%#010lx] (disabled)\n", | |
313 | base, limit + 0xfffff); | |
314 | } | |
315 | } | |
316 | ||
317 | static void __devinit pci_read_bridge_mmio_pref(struct pci_bus *child) | |
318 | { | |
319 | struct pci_dev *dev = child->self; | |
320 | u16 mem_base_lo, mem_limit_lo; | |
321 | unsigned long base, limit; | |
322 | struct resource *res; | |
323 | ||
324 | res = child->resource[2]; | |
325 | pci_read_config_word(dev, PCI_PREF_MEMORY_BASE, &mem_base_lo); | |
326 | pci_read_config_word(dev, PCI_PREF_MEMORY_LIMIT, &mem_limit_lo); | |
327 | base = (mem_base_lo & PCI_PREF_RANGE_MASK) << 16; | |
328 | limit = (mem_limit_lo & PCI_PREF_RANGE_MASK) << 16; | |
329 | ||
330 | if ((mem_base_lo & PCI_PREF_RANGE_TYPE_MASK) == PCI_PREF_RANGE_TYPE_64) { | |
331 | u32 mem_base_hi, mem_limit_hi; | |
332 | pci_read_config_dword(dev, PCI_PREF_BASE_UPPER32, &mem_base_hi); | |
333 | pci_read_config_dword(dev, PCI_PREF_LIMIT_UPPER32, &mem_limit_hi); | |
334 | ||
335 | /* | |
336 | * Some bridges set the base > limit by default, and some | |
337 | * (broken) BIOSes do not initialize them. If we find | |
338 | * this, just assume they are not being used. | |
339 | */ | |
340 | if (mem_base_hi <= mem_limit_hi) { | |
341 | #if BITS_PER_LONG == 64 | |
342 | base |= ((long) mem_base_hi) << 32; | |
343 | limit |= ((long) mem_limit_hi) << 32; | |
344 | #else | |
345 | if (mem_base_hi || mem_limit_hi) { | |
346 | dev_err(&dev->dev, "can't handle 64-bit " | |
347 | "address space for bridge\n"); | |
348 | return; | |
349 | } | |
350 | #endif | |
351 | } | |
352 | } | |
353 | if (base && base <= limit) { | |
354 | res->flags = (mem_base_lo & PCI_PREF_RANGE_TYPE_MASK) | | |
355 | IORESOURCE_MEM | IORESOURCE_PREFETCH; | |
356 | if (res->flags & PCI_PREF_RANGE_TYPE_64) | |
357 | res->flags |= IORESOURCE_MEM_64; | |
358 | res->start = base; | |
359 | res->end = limit + 0xfffff; | |
360 | dev_printk(KERN_DEBUG, &dev->dev, " bridge window %pR\n", res); | |
361 | } else { | |
362 | dev_printk(KERN_DEBUG, &dev->dev, | |
363 | " bridge window [mem %#010lx-%#010lx pref] (disabled)\n", | |
364 | base, limit + 0xfffff); | |
365 | } | |
366 | } | |
367 | ||
368 | void __devinit pci_read_bridge_bases(struct pci_bus *child) | |
369 | { | |
370 | struct pci_dev *dev = child->self; | |
371 | struct resource *res; | |
372 | int i; | |
373 | ||
374 | if (pci_is_root_bus(child)) /* It's a host bus, nothing to read */ | |
375 | return; | |
376 | ||
377 | dev_info(&dev->dev, "PCI bridge to [bus %02x-%02x]%s\n", | |
378 | child->secondary, child->subordinate, | |
379 | dev->transparent ? " (subtractive decode)" : ""); | |
380 | ||
381 | pci_bus_remove_resources(child); | |
382 | for (i = 0; i < PCI_BRIDGE_RESOURCE_NUM; i++) | |
383 | child->resource[i] = &dev->resource[PCI_BRIDGE_RESOURCES+i]; | |
384 | ||
385 | pci_read_bridge_io(child); | |
386 | pci_read_bridge_mmio(child); | |
387 | pci_read_bridge_mmio_pref(child); | |
388 | ||
389 | if (dev->transparent) { | |
390 | pci_bus_for_each_resource(child->parent, res, i) { | |
391 | if (res) { | |
392 | pci_bus_add_resource(child, res, | |
393 | PCI_SUBTRACTIVE_DECODE); | |
394 | dev_printk(KERN_DEBUG, &dev->dev, | |
395 | " bridge window %pR (subtractive decode)\n", | |
396 | res); | |
397 | } | |
398 | } | |
399 | } | |
400 | } | |
401 | ||
402 | static struct pci_bus * pci_alloc_bus(void) | |
403 | { | |
404 | struct pci_bus *b; | |
405 | ||
406 | b = kzalloc(sizeof(*b), GFP_KERNEL); | |
407 | if (b) { | |
408 | INIT_LIST_HEAD(&b->node); | |
409 | INIT_LIST_HEAD(&b->children); | |
410 | INIT_LIST_HEAD(&b->devices); | |
411 | INIT_LIST_HEAD(&b->slots); | |
412 | INIT_LIST_HEAD(&b->resources); | |
413 | b->max_bus_speed = PCI_SPEED_UNKNOWN; | |
414 | b->cur_bus_speed = PCI_SPEED_UNKNOWN; | |
415 | } | |
416 | return b; | |
417 | } | |
418 | ||
419 | static unsigned char pcix_bus_speed[] = { | |
420 | PCI_SPEED_UNKNOWN, /* 0 */ | |
421 | PCI_SPEED_66MHz_PCIX, /* 1 */ | |
422 | PCI_SPEED_100MHz_PCIX, /* 2 */ | |
423 | PCI_SPEED_133MHz_PCIX, /* 3 */ | |
424 | PCI_SPEED_UNKNOWN, /* 4 */ | |
425 | PCI_SPEED_66MHz_PCIX_ECC, /* 5 */ | |
426 | PCI_SPEED_100MHz_PCIX_ECC, /* 6 */ | |
427 | PCI_SPEED_133MHz_PCIX_ECC, /* 7 */ | |
428 | PCI_SPEED_UNKNOWN, /* 8 */ | |
429 | PCI_SPEED_66MHz_PCIX_266, /* 9 */ | |
430 | PCI_SPEED_100MHz_PCIX_266, /* A */ | |
431 | PCI_SPEED_133MHz_PCIX_266, /* B */ | |
432 | PCI_SPEED_UNKNOWN, /* C */ | |
433 | PCI_SPEED_66MHz_PCIX_533, /* D */ | |
434 | PCI_SPEED_100MHz_PCIX_533, /* E */ | |
435 | PCI_SPEED_133MHz_PCIX_533 /* F */ | |
436 | }; | |
437 | ||
438 | static unsigned char pcie_link_speed[] = { | |
439 | PCI_SPEED_UNKNOWN, /* 0 */ | |
440 | PCIE_SPEED_2_5GT, /* 1 */ | |
441 | PCIE_SPEED_5_0GT, /* 2 */ | |
442 | PCIE_SPEED_8_0GT, /* 3 */ | |
443 | PCI_SPEED_UNKNOWN, /* 4 */ | |
444 | PCI_SPEED_UNKNOWN, /* 5 */ | |
445 | PCI_SPEED_UNKNOWN, /* 6 */ | |
446 | PCI_SPEED_UNKNOWN, /* 7 */ | |
447 | PCI_SPEED_UNKNOWN, /* 8 */ | |
448 | PCI_SPEED_UNKNOWN, /* 9 */ | |
449 | PCI_SPEED_UNKNOWN, /* A */ | |
450 | PCI_SPEED_UNKNOWN, /* B */ | |
451 | PCI_SPEED_UNKNOWN, /* C */ | |
452 | PCI_SPEED_UNKNOWN, /* D */ | |
453 | PCI_SPEED_UNKNOWN, /* E */ | |
454 | PCI_SPEED_UNKNOWN /* F */ | |
455 | }; | |
456 | ||
457 | void pcie_update_link_speed(struct pci_bus *bus, u16 linksta) | |
458 | { | |
459 | bus->cur_bus_speed = pcie_link_speed[linksta & 0xf]; | |
460 | } | |
461 | EXPORT_SYMBOL_GPL(pcie_update_link_speed); | |
462 | ||
463 | static unsigned char agp_speeds[] = { | |
464 | AGP_UNKNOWN, | |
465 | AGP_1X, | |
466 | AGP_2X, | |
467 | AGP_4X, | |
468 | AGP_8X | |
469 | }; | |
470 | ||
471 | static enum pci_bus_speed agp_speed(int agp3, int agpstat) | |
472 | { | |
473 | int index = 0; | |
474 | ||
475 | if (agpstat & 4) | |
476 | index = 3; | |
477 | else if (agpstat & 2) | |
478 | index = 2; | |
479 | else if (agpstat & 1) | |
480 | index = 1; | |
481 | else | |
482 | goto out; | |
483 | ||
484 | if (agp3) { | |
485 | index += 2; | |
486 | if (index == 5) | |
487 | index = 0; | |
488 | } | |
489 | ||
490 | out: | |
491 | return agp_speeds[index]; | |
492 | } | |
493 | ||
494 | ||
495 | static void pci_set_bus_speed(struct pci_bus *bus) | |
496 | { | |
497 | struct pci_dev *bridge = bus->self; | |
498 | int pos; | |
499 | ||
500 | pos = pci_find_capability(bridge, PCI_CAP_ID_AGP); | |
501 | if (!pos) | |
502 | pos = pci_find_capability(bridge, PCI_CAP_ID_AGP3); | |
503 | if (pos) { | |
504 | u32 agpstat, agpcmd; | |
505 | ||
506 | pci_read_config_dword(bridge, pos + PCI_AGP_STATUS, &agpstat); | |
507 | bus->max_bus_speed = agp_speed(agpstat & 8, agpstat & 7); | |
508 | ||
509 | pci_read_config_dword(bridge, pos + PCI_AGP_COMMAND, &agpcmd); | |
510 | bus->cur_bus_speed = agp_speed(agpstat & 8, agpcmd & 7); | |
511 | } | |
512 | ||
513 | pos = pci_find_capability(bridge, PCI_CAP_ID_PCIX); | |
514 | if (pos) { | |
515 | u16 status; | |
516 | enum pci_bus_speed max; | |
517 | pci_read_config_word(bridge, pos + 2, &status); | |
518 | ||
519 | if (status & 0x8000) { | |
520 | max = PCI_SPEED_133MHz_PCIX_533; | |
521 | } else if (status & 0x4000) { | |
522 | max = PCI_SPEED_133MHz_PCIX_266; | |
523 | } else if (status & 0x0002) { | |
524 | if (((status >> 12) & 0x3) == 2) { | |
525 | max = PCI_SPEED_133MHz_PCIX_ECC; | |
526 | } else { | |
527 | max = PCI_SPEED_133MHz_PCIX; | |
528 | } | |
529 | } else { | |
530 | max = PCI_SPEED_66MHz_PCIX; | |
531 | } | |
532 | ||
533 | bus->max_bus_speed = max; | |
534 | bus->cur_bus_speed = pcix_bus_speed[(status >> 6) & 0xf]; | |
535 | ||
536 | return; | |
537 | } | |
538 | ||
539 | pos = pci_find_capability(bridge, PCI_CAP_ID_EXP); | |
540 | if (pos) { | |
541 | u32 linkcap; | |
542 | u16 linksta; | |
543 | ||
544 | pci_read_config_dword(bridge, pos + PCI_EXP_LNKCAP, &linkcap); | |
545 | bus->max_bus_speed = pcie_link_speed[linkcap & 0xf]; | |
546 | ||
547 | pci_read_config_word(bridge, pos + PCI_EXP_LNKSTA, &linksta); | |
548 | pcie_update_link_speed(bus, linksta); | |
549 | } | |
550 | } | |
551 | ||
552 | ||
553 | static struct pci_bus *pci_alloc_child_bus(struct pci_bus *parent, | |
554 | struct pci_dev *bridge, int busnr) | |
555 | { | |
556 | struct pci_bus *child; | |
557 | int i; | |
558 | ||
559 | /* | |
560 | * Allocate a new bus, and inherit stuff from the parent.. | |
561 | */ | |
562 | child = pci_alloc_bus(); | |
563 | if (!child) | |
564 | return NULL; | |
565 | ||
566 | child->parent = parent; | |
567 | child->ops = parent->ops; | |
568 | child->sysdata = parent->sysdata; | |
569 | child->bus_flags = parent->bus_flags; | |
570 | ||
571 | /* initialize some portions of the bus device, but don't register it | |
572 | * now as the parent is not properly set up yet. This device will get | |
573 | * registered later in pci_bus_add_devices() | |
574 | */ | |
575 | child->dev.class = &pcibus_class; | |
576 | dev_set_name(&child->dev, "%04x:%02x", pci_domain_nr(child), busnr); | |
577 | ||
578 | /* | |
579 | * Set up the primary, secondary and subordinate | |
580 | * bus numbers. | |
581 | */ | |
582 | child->number = child->secondary = busnr; | |
583 | child->primary = parent->secondary; | |
584 | child->subordinate = 0xff; | |
585 | ||
586 | if (!bridge) | |
587 | return child; | |
588 | ||
589 | child->self = bridge; | |
590 | child->bridge = get_device(&bridge->dev); | |
591 | ||
592 | pci_set_bus_speed(child); | |
593 | ||
594 | /* Set up default resource pointers and names.. */ | |
595 | for (i = 0; i < PCI_BRIDGE_RESOURCE_NUM; i++) { | |
596 | child->resource[i] = &bridge->resource[PCI_BRIDGE_RESOURCES+i]; | |
597 | child->resource[i]->name = child->name; | |
598 | } | |
599 | bridge->subordinate = child; | |
600 | ||
601 | return child; | |
602 | } | |
603 | ||
604 | struct pci_bus *__ref pci_add_new_bus(struct pci_bus *parent, struct pci_dev *dev, int busnr) | |
605 | { | |
606 | struct pci_bus *child; | |
607 | ||
608 | child = pci_alloc_child_bus(parent, dev, busnr); | |
609 | if (child) { | |
610 | down_write(&pci_bus_sem); | |
611 | list_add_tail(&child->node, &parent->children); | |
612 | up_write(&pci_bus_sem); | |
613 | } | |
614 | return child; | |
615 | } | |
616 | ||
617 | static void pci_fixup_parent_subordinate_busnr(struct pci_bus *child, int max) | |
618 | { | |
619 | struct pci_bus *parent = child->parent; | |
620 | ||
621 | /* Attempts to fix that up are really dangerous unless | |
622 | we're going to re-assign all bus numbers. */ | |
623 | if (!pcibios_assign_all_busses()) | |
624 | return; | |
625 | ||
626 | while (parent->parent && parent->subordinate < max) { | |
627 | parent->subordinate = max; | |
628 | pci_write_config_byte(parent->self, PCI_SUBORDINATE_BUS, max); | |
629 | parent = parent->parent; | |
630 | } | |
631 | } | |
632 | ||
633 | /* | |
634 | * If it's a bridge, configure it and scan the bus behind it. | |
635 | * For CardBus bridges, we don't scan behind as the devices will | |
636 | * be handled by the bridge driver itself. | |
637 | * | |
638 | * We need to process bridges in two passes -- first we scan those | |
639 | * already configured by the BIOS and after we are done with all of | |
640 | * them, we proceed to assigning numbers to the remaining buses in | |
641 | * order to avoid overlaps between old and new bus numbers. | |
642 | */ | |
643 | int __devinit pci_scan_bridge(struct pci_bus *bus, struct pci_dev *dev, int max, int pass) | |
644 | { | |
645 | struct pci_bus *child; | |
646 | int is_cardbus = (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS); | |
647 | u32 buses, i, j = 0; | |
648 | u16 bctl; | |
649 | u8 primary, secondary, subordinate; | |
650 | int broken = 0; | |
651 | ||
652 | pci_read_config_dword(dev, PCI_PRIMARY_BUS, &buses); | |
653 | primary = buses & 0xFF; | |
654 | secondary = (buses >> 8) & 0xFF; | |
655 | subordinate = (buses >> 16) & 0xFF; | |
656 | ||
657 | dev_dbg(&dev->dev, "scanning [bus %02x-%02x] behind bridge, pass %d\n", | |
658 | secondary, subordinate, pass); | |
659 | ||
660 | /* Check if setup is sensible at all */ | |
661 | if (!pass && | |
662 | (primary != bus->number || secondary <= bus->number)) { | |
663 | dev_dbg(&dev->dev, "bus configuration invalid, reconfiguring\n"); | |
664 | broken = 1; | |
665 | } | |
666 | ||
667 | /* Disable MasterAbortMode during probing to avoid reporting | |
668 | of bus errors (in some architectures) */ | |
669 | pci_read_config_word(dev, PCI_BRIDGE_CONTROL, &bctl); | |
670 | pci_write_config_word(dev, PCI_BRIDGE_CONTROL, | |
671 | bctl & ~PCI_BRIDGE_CTL_MASTER_ABORT); | |
672 | ||
673 | if ((secondary || subordinate) && !pcibios_assign_all_busses() && | |
674 | !is_cardbus && !broken) { | |
675 | unsigned int cmax; | |
676 | /* | |
677 | * Bus already configured by firmware, process it in the first | |
678 | * pass and just note the configuration. | |
679 | */ | |
680 | if (pass) | |
681 | goto out; | |
682 | ||
683 | /* | |
684 | * If we already got to this bus through a different bridge, | |
685 | * don't re-add it. This can happen with the i450NX chipset. | |
686 | * | |
687 | * However, we continue to descend down the hierarchy and | |
688 | * scan remaining child buses. | |
689 | */ | |
690 | child = pci_find_bus(pci_domain_nr(bus), secondary); | |
691 | if (!child) { | |
692 | child = pci_add_new_bus(bus, dev, secondary); | |
693 | if (!child) | |
694 | goto out; | |
695 | child->primary = primary; | |
696 | child->subordinate = subordinate; | |
697 | child->bridge_ctl = bctl; | |
698 | } | |
699 | ||
700 | cmax = pci_scan_child_bus(child); | |
701 | if (cmax > max) | |
702 | max = cmax; | |
703 | if (child->subordinate > max) | |
704 | max = child->subordinate; | |
705 | } else { | |
706 | /* | |
707 | * We need to assign a number to this bus which we always | |
708 | * do in the second pass. | |
709 | */ | |
710 | if (!pass) { | |
711 | if (pcibios_assign_all_busses() || broken) | |
712 | /* Temporarily disable forwarding of the | |
713 | configuration cycles on all bridges in | |
714 | this bus segment to avoid possible | |
715 | conflicts in the second pass between two | |
716 | bridges programmed with overlapping | |
717 | bus ranges. */ | |
718 | pci_write_config_dword(dev, PCI_PRIMARY_BUS, | |
719 | buses & ~0xffffff); | |
720 | goto out; | |
721 | } | |
722 | ||
723 | /* Clear errors */ | |
724 | pci_write_config_word(dev, PCI_STATUS, 0xffff); | |
725 | ||
726 | /* Prevent assigning a bus number that already exists. | |
727 | * This can happen when a bridge is hot-plugged */ | |
728 | if (pci_find_bus(pci_domain_nr(bus), max+1)) | |
729 | goto out; | |
730 | child = pci_add_new_bus(bus, dev, ++max); | |
731 | if (!child) | |
732 | goto out; | |
733 | buses = (buses & 0xff000000) | |
734 | | ((unsigned int)(child->primary) << 0) | |
735 | | ((unsigned int)(child->secondary) << 8) | |
736 | | ((unsigned int)(child->subordinate) << 16); | |
737 | ||
738 | /* | |
739 | * yenta.c forces a secondary latency timer of 176. | |
740 | * Copy that behaviour here. | |
741 | */ | |
742 | if (is_cardbus) { | |
743 | buses &= ~0xff000000; | |
744 | buses |= CARDBUS_LATENCY_TIMER << 24; | |
745 | } | |
746 | ||
747 | /* | |
748 | * We need to blast all three values with a single write. | |
749 | */ | |
750 | pci_write_config_dword(dev, PCI_PRIMARY_BUS, buses); | |
751 | ||
752 | if (!is_cardbus) { | |
753 | child->bridge_ctl = bctl; | |
754 | /* | |
755 | * Adjust subordinate busnr in parent buses. | |
756 | * We do this before scanning for children because | |
757 | * some devices may not be detected if the bios | |
758 | * was lazy. | |
759 | */ | |
760 | pci_fixup_parent_subordinate_busnr(child, max); | |
761 | /* Now we can scan all subordinate buses... */ | |
762 | max = pci_scan_child_bus(child); | |
763 | /* | |
764 | * now fix it up again since we have found | |
765 | * the real value of max. | |
766 | */ | |
767 | pci_fixup_parent_subordinate_busnr(child, max); | |
768 | } else { | |
769 | /* | |
770 | * For CardBus bridges, we leave 4 bus numbers | |
771 | * as cards with a PCI-to-PCI bridge can be | |
772 | * inserted later. | |
773 | */ | |
774 | for (i=0; i<CARDBUS_RESERVE_BUSNR; i++) { | |
775 | struct pci_bus *parent = bus; | |
776 | if (pci_find_bus(pci_domain_nr(bus), | |
777 | max+i+1)) | |
778 | break; | |
779 | while (parent->parent) { | |
780 | if ((!pcibios_assign_all_busses()) && | |
781 | (parent->subordinate > max) && | |
782 | (parent->subordinate <= max+i)) { | |
783 | j = 1; | |
784 | } | |
785 | parent = parent->parent; | |
786 | } | |
787 | if (j) { | |
788 | /* | |
789 | * Often, there are two cardbus bridges | |
790 | * -- try to leave one valid bus number | |
791 | * for each one. | |
792 | */ | |
793 | i /= 2; | |
794 | break; | |
795 | } | |
796 | } | |
797 | max += i; | |
798 | pci_fixup_parent_subordinate_busnr(child, max); | |
799 | } | |
800 | /* | |
801 | * Set the subordinate bus number to its real value. | |
802 | */ | |
803 | child->subordinate = max; | |
804 | pci_write_config_byte(dev, PCI_SUBORDINATE_BUS, max); | |
805 | } | |
806 | ||
807 | sprintf(child->name, | |
808 | (is_cardbus ? "PCI CardBus %04x:%02x" : "PCI Bus %04x:%02x"), | |
809 | pci_domain_nr(bus), child->number); | |
810 | ||
811 | /* Has only triggered on CardBus, fixup is in yenta_socket */ | |
812 | while (bus->parent) { | |
813 | if ((child->subordinate > bus->subordinate) || | |
814 | (child->number > bus->subordinate) || | |
815 | (child->number < bus->number) || | |
816 | (child->subordinate < bus->number)) { | |
817 | dev_info(&child->dev, "[bus %02x-%02x] %s " | |
818 | "hidden behind%s bridge %s [bus %02x-%02x]\n", | |
819 | child->number, child->subordinate, | |
820 | (bus->number > child->subordinate && | |
821 | bus->subordinate < child->number) ? | |
822 | "wholly" : "partially", | |
823 | bus->self->transparent ? " transparent" : "", | |
824 | dev_name(&bus->dev), | |
825 | bus->number, bus->subordinate); | |
826 | } | |
827 | bus = bus->parent; | |
828 | } | |
829 | ||
830 | out: | |
831 | pci_write_config_word(dev, PCI_BRIDGE_CONTROL, bctl); | |
832 | ||
833 | return max; | |
834 | } | |
835 | ||
836 | /* | |
837 | * Read interrupt line and base address registers. | |
838 | * The architecture-dependent code can tweak these, of course. | |
839 | */ | |
840 | static void pci_read_irq(struct pci_dev *dev) | |
841 | { | |
842 | unsigned char irq; | |
843 | ||
844 | pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &irq); | |
845 | dev->pin = irq; | |
846 | if (irq) | |
847 | pci_read_config_byte(dev, PCI_INTERRUPT_LINE, &irq); | |
848 | dev->irq = irq; | |
849 | } | |
850 | ||
851 | void set_pcie_port_type(struct pci_dev *pdev) | |
852 | { | |
853 | int pos; | |
854 | u16 reg16; | |
855 | ||
856 | pos = pci_find_capability(pdev, PCI_CAP_ID_EXP); | |
857 | if (!pos) | |
858 | return; | |
859 | pdev->is_pcie = 1; | |
860 | pdev->pcie_cap = pos; | |
861 | pci_read_config_word(pdev, pos + PCI_EXP_FLAGS, ®16); | |
862 | pdev->pcie_type = (reg16 & PCI_EXP_FLAGS_TYPE) >> 4; | |
863 | } | |
864 | ||
865 | void set_pcie_hotplug_bridge(struct pci_dev *pdev) | |
866 | { | |
867 | int pos; | |
868 | u16 reg16; | |
869 | u32 reg32; | |
870 | ||
871 | pos = pci_pcie_cap(pdev); | |
872 | if (!pos) | |
873 | return; | |
874 | pci_read_config_word(pdev, pos + PCI_EXP_FLAGS, ®16); | |
875 | if (!(reg16 & PCI_EXP_FLAGS_SLOT)) | |
876 | return; | |
877 | pci_read_config_dword(pdev, pos + PCI_EXP_SLTCAP, ®32); | |
878 | if (reg32 & PCI_EXP_SLTCAP_HPC) | |
879 | pdev->is_hotplug_bridge = 1; | |
880 | } | |
881 | ||
882 | #define LEGACY_IO_RESOURCE (IORESOURCE_IO | IORESOURCE_PCI_FIXED) | |
883 | ||
884 | /** | |
885 | * pci_setup_device - fill in class and map information of a device | |
886 | * @dev: the device structure to fill | |
887 | * | |
888 | * Initialize the device structure with information about the device's | |
889 | * vendor,class,memory and IO-space addresses,IRQ lines etc. | |
890 | * Called at initialisation of the PCI subsystem and by CardBus services. | |
891 | * Returns 0 on success and negative if unknown type of device (not normal, | |
892 | * bridge or CardBus). | |
893 | */ | |
894 | int pci_setup_device(struct pci_dev *dev) | |
895 | { | |
896 | u32 class; | |
897 | u8 hdr_type; | |
898 | struct pci_slot *slot; | |
899 | int pos = 0; | |
900 | ||
901 | if (pci_read_config_byte(dev, PCI_HEADER_TYPE, &hdr_type)) | |
902 | return -EIO; | |
903 | ||
904 | dev->sysdata = dev->bus->sysdata; | |
905 | dev->dev.parent = dev->bus->bridge; | |
906 | dev->dev.bus = &pci_bus_type; | |
907 | dev->hdr_type = hdr_type & 0x7f; | |
908 | dev->multifunction = !!(hdr_type & 0x80); | |
909 | dev->error_state = pci_channel_io_normal; | |
910 | set_pcie_port_type(dev); | |
911 | ||
912 | list_for_each_entry(slot, &dev->bus->slots, list) | |
913 | if (PCI_SLOT(dev->devfn) == slot->number) | |
914 | dev->slot = slot; | |
915 | ||
916 | /* Assume 32-bit PCI; let 64-bit PCI cards (which are far rarer) | |
917 | set this higher, assuming the system even supports it. */ | |
918 | dev->dma_mask = 0xffffffff; | |
919 | ||
920 | dev_set_name(&dev->dev, "%04x:%02x:%02x.%d", pci_domain_nr(dev->bus), | |
921 | dev->bus->number, PCI_SLOT(dev->devfn), | |
922 | PCI_FUNC(dev->devfn)); | |
923 | ||
924 | pci_read_config_dword(dev, PCI_CLASS_REVISION, &class); | |
925 | dev->revision = class & 0xff; | |
926 | class >>= 8; /* upper 3 bytes */ | |
927 | dev->class = class; | |
928 | class >>= 8; | |
929 | ||
930 | dev_printk(KERN_DEBUG, &dev->dev, "[%04x:%04x] type %d class %#08x\n", | |
931 | dev->vendor, dev->device, dev->hdr_type, class); | |
932 | ||
933 | /* need to have dev->class ready */ | |
934 | dev->cfg_size = pci_cfg_space_size(dev); | |
935 | ||
936 | /* "Unknown power state" */ | |
937 | dev->current_state = PCI_UNKNOWN; | |
938 | ||
939 | /* Early fixups, before probing the BARs */ | |
940 | pci_fixup_device(pci_fixup_early, dev); | |
941 | /* device class may be changed after fixup */ | |
942 | class = dev->class >> 8; | |
943 | ||
944 | switch (dev->hdr_type) { /* header type */ | |
945 | case PCI_HEADER_TYPE_NORMAL: /* standard header */ | |
946 | if (class == PCI_CLASS_BRIDGE_PCI) | |
947 | goto bad; | |
948 | pci_read_irq(dev); | |
949 | pci_read_bases(dev, 6, PCI_ROM_ADDRESS); | |
950 | pci_read_config_word(dev, PCI_SUBSYSTEM_VENDOR_ID, &dev->subsystem_vendor); | |
951 | pci_read_config_word(dev, PCI_SUBSYSTEM_ID, &dev->subsystem_device); | |
952 | ||
953 | /* | |
954 | * Do the ugly legacy mode stuff here rather than broken chip | |
955 | * quirk code. Legacy mode ATA controllers have fixed | |
956 | * addresses. These are not always echoed in BAR0-3, and | |
957 | * BAR0-3 in a few cases contain junk! | |
958 | */ | |
959 | if (class == PCI_CLASS_STORAGE_IDE) { | |
960 | u8 progif; | |
961 | pci_read_config_byte(dev, PCI_CLASS_PROG, &progif); | |
962 | if ((progif & 1) == 0) { | |
963 | dev->resource[0].start = 0x1F0; | |
964 | dev->resource[0].end = 0x1F7; | |
965 | dev->resource[0].flags = LEGACY_IO_RESOURCE; | |
966 | dev->resource[1].start = 0x3F6; | |
967 | dev->resource[1].end = 0x3F6; | |
968 | dev->resource[1].flags = LEGACY_IO_RESOURCE; | |
969 | } | |
970 | if ((progif & 4) == 0) { | |
971 | dev->resource[2].start = 0x170; | |
972 | dev->resource[2].end = 0x177; | |
973 | dev->resource[2].flags = LEGACY_IO_RESOURCE; | |
974 | dev->resource[3].start = 0x376; | |
975 | dev->resource[3].end = 0x376; | |
976 | dev->resource[3].flags = LEGACY_IO_RESOURCE; | |
977 | } | |
978 | } | |
979 | break; | |
980 | ||
981 | case PCI_HEADER_TYPE_BRIDGE: /* bridge header */ | |
982 | if (class != PCI_CLASS_BRIDGE_PCI) | |
983 | goto bad; | |
984 | /* The PCI-to-PCI bridge spec requires that subtractive | |
985 | decoding (i.e. transparent) bridge must have programming | |
986 | interface code of 0x01. */ | |
987 | pci_read_irq(dev); | |
988 | dev->transparent = ((dev->class & 0xff) == 1); | |
989 | pci_read_bases(dev, 2, PCI_ROM_ADDRESS1); | |
990 | set_pcie_hotplug_bridge(dev); | |
991 | pos = pci_find_capability(dev, PCI_CAP_ID_SSVID); | |
992 | if (pos) { | |
993 | pci_read_config_word(dev, pos + PCI_SSVID_VENDOR_ID, &dev->subsystem_vendor); | |
994 | pci_read_config_word(dev, pos + PCI_SSVID_DEVICE_ID, &dev->subsystem_device); | |
995 | } | |
996 | break; | |
997 | ||
998 | case PCI_HEADER_TYPE_CARDBUS: /* CardBus bridge header */ | |
999 | if (class != PCI_CLASS_BRIDGE_CARDBUS) | |
1000 | goto bad; | |
1001 | pci_read_irq(dev); | |
1002 | pci_read_bases(dev, 1, 0); | |
1003 | pci_read_config_word(dev, PCI_CB_SUBSYSTEM_VENDOR_ID, &dev->subsystem_vendor); | |
1004 | pci_read_config_word(dev, PCI_CB_SUBSYSTEM_ID, &dev->subsystem_device); | |
1005 | break; | |
1006 | ||
1007 | default: /* unknown header */ | |
1008 | dev_err(&dev->dev, "unknown header type %02x, " | |
1009 | "ignoring device\n", dev->hdr_type); | |
1010 | return -EIO; | |
1011 | ||
1012 | bad: | |
1013 | dev_err(&dev->dev, "ignoring class %02x (doesn't match header " | |
1014 | "type %02x)\n", class, dev->hdr_type); | |
1015 | dev->class = PCI_CLASS_NOT_DEFINED; | |
1016 | } | |
1017 | ||
1018 | /* We found a fine healthy device, go go go... */ | |
1019 | return 0; | |
1020 | } | |
1021 | ||
1022 | static void pci_release_capabilities(struct pci_dev *dev) | |
1023 | { | |
1024 | pci_vpd_release(dev); | |
1025 | pci_iov_release(dev); | |
1026 | } | |
1027 | ||
1028 | /** | |
1029 | * pci_release_dev - free a pci device structure when all users of it are finished. | |
1030 | * @dev: device that's been disconnected | |
1031 | * | |
1032 | * Will be called only by the device core when all users of this pci device are | |
1033 | * done. | |
1034 | */ | |
1035 | static void pci_release_dev(struct device *dev) | |
1036 | { | |
1037 | struct pci_dev *pci_dev; | |
1038 | ||
1039 | pci_dev = to_pci_dev(dev); | |
1040 | pci_release_capabilities(pci_dev); | |
1041 | kfree(pci_dev); | |
1042 | } | |
1043 | ||
1044 | /** | |
1045 | * pci_cfg_space_size - get the configuration space size of the PCI device. | |
1046 | * @dev: PCI device | |
1047 | * | |
1048 | * Regular PCI devices have 256 bytes, but PCI-X 2 and PCI Express devices | |
1049 | * have 4096 bytes. Even if the device is capable, that doesn't mean we can | |
1050 | * access it. Maybe we don't have a way to generate extended config space | |
1051 | * accesses, or the device is behind a reverse Express bridge. So we try | |
1052 | * reading the dword at 0x100 which must either be 0 or a valid extended | |
1053 | * capability header. | |
1054 | */ | |
1055 | int pci_cfg_space_size_ext(struct pci_dev *dev) | |
1056 | { | |
1057 | u32 status; | |
1058 | int pos = PCI_CFG_SPACE_SIZE; | |
1059 | ||
1060 | if (pci_read_config_dword(dev, pos, &status) != PCIBIOS_SUCCESSFUL) | |
1061 | goto fail; | |
1062 | if (status == 0xffffffff) | |
1063 | goto fail; | |
1064 | ||
1065 | return PCI_CFG_SPACE_EXP_SIZE; | |
1066 | ||
1067 | fail: | |
1068 | return PCI_CFG_SPACE_SIZE; | |
1069 | } | |
1070 | ||
1071 | int pci_cfg_space_size(struct pci_dev *dev) | |
1072 | { | |
1073 | int pos; | |
1074 | u32 status; | |
1075 | u16 class; | |
1076 | ||
1077 | class = dev->class >> 8; | |
1078 | if (class == PCI_CLASS_BRIDGE_HOST) | |
1079 | return pci_cfg_space_size_ext(dev); | |
1080 | ||
1081 | pos = pci_pcie_cap(dev); | |
1082 | if (!pos) { | |
1083 | pos = pci_find_capability(dev, PCI_CAP_ID_PCIX); | |
1084 | if (!pos) | |
1085 | goto fail; | |
1086 | ||
1087 | pci_read_config_dword(dev, pos + PCI_X_STATUS, &status); | |
1088 | if (!(status & (PCI_X_STATUS_266MHZ | PCI_X_STATUS_533MHZ))) | |
1089 | goto fail; | |
1090 | } | |
1091 | ||
1092 | return pci_cfg_space_size_ext(dev); | |
1093 | ||
1094 | fail: | |
1095 | return PCI_CFG_SPACE_SIZE; | |
1096 | } | |
1097 | ||
1098 | static void pci_release_bus_bridge_dev(struct device *dev) | |
1099 | { | |
1100 | kfree(dev); | |
1101 | } | |
1102 | ||
1103 | struct pci_dev *alloc_pci_dev(void) | |
1104 | { | |
1105 | struct pci_dev *dev; | |
1106 | ||
1107 | dev = kzalloc(sizeof(struct pci_dev), GFP_KERNEL); | |
1108 | if (!dev) | |
1109 | return NULL; | |
1110 | ||
1111 | INIT_LIST_HEAD(&dev->bus_list); | |
1112 | ||
1113 | return dev; | |
1114 | } | |
1115 | EXPORT_SYMBOL(alloc_pci_dev); | |
1116 | ||
1117 | /* | |
1118 | * Read the config data for a PCI device, sanity-check it | |
1119 | * and fill in the dev structure... | |
1120 | */ | |
1121 | static struct pci_dev *pci_scan_device(struct pci_bus *bus, int devfn) | |
1122 | { | |
1123 | struct pci_dev *dev; | |
1124 | u32 l; | |
1125 | int delay = 1; | |
1126 | ||
1127 | if (pci_bus_read_config_dword(bus, devfn, PCI_VENDOR_ID, &l)) | |
1128 | return NULL; | |
1129 | ||
1130 | /* some broken boards return 0 or ~0 if a slot is empty: */ | |
1131 | if (l == 0xffffffff || l == 0x00000000 || | |
1132 | l == 0x0000ffff || l == 0xffff0000) | |
1133 | return NULL; | |
1134 | ||
1135 | /* Configuration request Retry Status */ | |
1136 | while (l == 0xffff0001) { | |
1137 | msleep(delay); | |
1138 | delay *= 2; | |
1139 | if (pci_bus_read_config_dword(bus, devfn, PCI_VENDOR_ID, &l)) | |
1140 | return NULL; | |
1141 | /* Card hasn't responded in 60 seconds? Must be stuck. */ | |
1142 | if (delay > 60 * 1000) { | |
1143 | printk(KERN_WARNING "pci %04x:%02x:%02x.%d: not " | |
1144 | "responding\n", pci_domain_nr(bus), | |
1145 | bus->number, PCI_SLOT(devfn), | |
1146 | PCI_FUNC(devfn)); | |
1147 | return NULL; | |
1148 | } | |
1149 | } | |
1150 | ||
1151 | dev = alloc_pci_dev(); | |
1152 | if (!dev) | |
1153 | return NULL; | |
1154 | ||
1155 | dev->bus = bus; | |
1156 | dev->devfn = devfn; | |
1157 | dev->vendor = l & 0xffff; | |
1158 | dev->device = (l >> 16) & 0xffff; | |
1159 | ||
1160 | if (pci_setup_device(dev)) { | |
1161 | kfree(dev); | |
1162 | return NULL; | |
1163 | } | |
1164 | ||
1165 | return dev; | |
1166 | } | |
1167 | ||
1168 | static void pci_init_capabilities(struct pci_dev *dev) | |
1169 | { | |
1170 | /* MSI/MSI-X list */ | |
1171 | pci_msi_init_pci_dev(dev); | |
1172 | ||
1173 | /* Buffers for saving PCIe and PCI-X capabilities */ | |
1174 | pci_allocate_cap_save_buffers(dev); | |
1175 | ||
1176 | /* Power Management */ | |
1177 | pci_pm_init(dev); | |
1178 | platform_pci_wakeup_init(dev); | |
1179 | ||
1180 | /* Vital Product Data */ | |
1181 | pci_vpd_pci22_init(dev); | |
1182 | ||
1183 | /* Alternative Routing-ID Forwarding */ | |
1184 | pci_enable_ari(dev); | |
1185 | ||
1186 | /* Single Root I/O Virtualization */ | |
1187 | pci_iov_init(dev); | |
1188 | ||
1189 | /* Enable ACS P2P upstream forwarding */ | |
1190 | pci_enable_acs(dev); | |
1191 | } | |
1192 | ||
1193 | void pci_device_add(struct pci_dev *dev, struct pci_bus *bus) | |
1194 | { | |
1195 | device_initialize(&dev->dev); | |
1196 | dev->dev.release = pci_release_dev; | |
1197 | pci_dev_get(dev); | |
1198 | ||
1199 | dev->dev.dma_mask = &dev->dma_mask; | |
1200 | dev->dev.dma_parms = &dev->dma_parms; | |
1201 | dev->dev.coherent_dma_mask = 0xffffffffull; | |
1202 | ||
1203 | pci_set_dma_max_seg_size(dev, 65536); | |
1204 | pci_set_dma_seg_boundary(dev, 0xffffffff); | |
1205 | ||
1206 | /* Fix up broken headers */ | |
1207 | pci_fixup_device(pci_fixup_header, dev); | |
1208 | ||
1209 | /* Clear the state_saved flag. */ | |
1210 | dev->state_saved = false; | |
1211 | ||
1212 | /* Initialize various capabilities */ | |
1213 | pci_init_capabilities(dev); | |
1214 | ||
1215 | /* | |
1216 | * Add the device to our list of discovered devices | |
1217 | * and the bus list for fixup functions, etc. | |
1218 | */ | |
1219 | down_write(&pci_bus_sem); | |
1220 | list_add_tail(&dev->bus_list, &bus->devices); | |
1221 | up_write(&pci_bus_sem); | |
1222 | } | |
1223 | ||
1224 | struct pci_dev *__ref pci_scan_single_device(struct pci_bus *bus, int devfn) | |
1225 | { | |
1226 | struct pci_dev *dev; | |
1227 | ||
1228 | dev = pci_get_slot(bus, devfn); | |
1229 | if (dev) { | |
1230 | pci_dev_put(dev); | |
1231 | return dev; | |
1232 | } | |
1233 | ||
1234 | dev = pci_scan_device(bus, devfn); | |
1235 | if (!dev) | |
1236 | return NULL; | |
1237 | ||
1238 | pci_device_add(dev, bus); | |
1239 | ||
1240 | return dev; | |
1241 | } | |
1242 | EXPORT_SYMBOL(pci_scan_single_device); | |
1243 | ||
1244 | static unsigned next_ari_fn(struct pci_dev *dev, unsigned fn) | |
1245 | { | |
1246 | u16 cap; | |
1247 | unsigned pos, next_fn; | |
1248 | ||
1249 | if (!dev) | |
1250 | return 0; | |
1251 | ||
1252 | pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ARI); | |
1253 | if (!pos) | |
1254 | return 0; | |
1255 | pci_read_config_word(dev, pos + 4, &cap); | |
1256 | next_fn = cap >> 8; | |
1257 | if (next_fn <= fn) | |
1258 | return 0; | |
1259 | return next_fn; | |
1260 | } | |
1261 | ||
1262 | static unsigned next_trad_fn(struct pci_dev *dev, unsigned fn) | |
1263 | { | |
1264 | return (fn + 1) % 8; | |
1265 | } | |
1266 | ||
1267 | static unsigned no_next_fn(struct pci_dev *dev, unsigned fn) | |
1268 | { | |
1269 | return 0; | |
1270 | } | |
1271 | ||
1272 | static int only_one_child(struct pci_bus *bus) | |
1273 | { | |
1274 | struct pci_dev *parent = bus->self; | |
1275 | if (!parent || !pci_is_pcie(parent)) | |
1276 | return 0; | |
1277 | if (parent->pcie_type == PCI_EXP_TYPE_ROOT_PORT || | |
1278 | parent->pcie_type == PCI_EXP_TYPE_DOWNSTREAM) | |
1279 | return 1; | |
1280 | return 0; | |
1281 | } | |
1282 | ||
1283 | /** | |
1284 | * pci_scan_slot - scan a PCI slot on a bus for devices. | |
1285 | * @bus: PCI bus to scan | |
1286 | * @devfn: slot number to scan (must have zero function.) | |
1287 | * | |
1288 | * Scan a PCI slot on the specified PCI bus for devices, adding | |
1289 | * discovered devices to the @bus->devices list. New devices | |
1290 | * will not have is_added set. | |
1291 | * | |
1292 | * Returns the number of new devices found. | |
1293 | */ | |
1294 | int pci_scan_slot(struct pci_bus *bus, int devfn) | |
1295 | { | |
1296 | unsigned fn, nr = 0; | |
1297 | struct pci_dev *dev; | |
1298 | unsigned (*next_fn)(struct pci_dev *, unsigned) = no_next_fn; | |
1299 | ||
1300 | if (only_one_child(bus) && (devfn > 0)) | |
1301 | return 0; /* Already scanned the entire slot */ | |
1302 | ||
1303 | dev = pci_scan_single_device(bus, devfn); | |
1304 | if (!dev) | |
1305 | return 0; | |
1306 | if (!dev->is_added) | |
1307 | nr++; | |
1308 | ||
1309 | if (pci_ari_enabled(bus)) | |
1310 | next_fn = next_ari_fn; | |
1311 | else if (dev->multifunction) | |
1312 | next_fn = next_trad_fn; | |
1313 | ||
1314 | for (fn = next_fn(dev, 0); fn > 0; fn = next_fn(dev, fn)) { | |
1315 | dev = pci_scan_single_device(bus, devfn + fn); | |
1316 | if (dev) { | |
1317 | if (!dev->is_added) | |
1318 | nr++; | |
1319 | dev->multifunction = 1; | |
1320 | } | |
1321 | } | |
1322 | ||
1323 | /* only one slot has pcie device */ | |
1324 | if (bus->self && nr) | |
1325 | pcie_aspm_init_link_state(bus->self); | |
1326 | ||
1327 | return nr; | |
1328 | } | |
1329 | ||
1330 | unsigned int __devinit pci_scan_child_bus(struct pci_bus *bus) | |
1331 | { | |
1332 | unsigned int devfn, pass, max = bus->secondary; | |
1333 | struct pci_dev *dev; | |
1334 | ||
1335 | dev_dbg(&bus->dev, "scanning bus\n"); | |
1336 | ||
1337 | /* Go find them, Rover! */ | |
1338 | for (devfn = 0; devfn < 0x100; devfn += 8) | |
1339 | pci_scan_slot(bus, devfn); | |
1340 | ||
1341 | /* Reserve buses for SR-IOV capability. */ | |
1342 | max += pci_iov_bus_range(bus); | |
1343 | ||
1344 | /* | |
1345 | * After performing arch-dependent fixup of the bus, look behind | |
1346 | * all PCI-to-PCI bridges on this bus. | |
1347 | */ | |
1348 | if (!bus->is_added) { | |
1349 | dev_dbg(&bus->dev, "fixups for bus\n"); | |
1350 | pcibios_fixup_bus(bus); | |
1351 | if (pci_is_root_bus(bus)) | |
1352 | bus->is_added = 1; | |
1353 | } | |
1354 | ||
1355 | for (pass=0; pass < 2; pass++) | |
1356 | list_for_each_entry(dev, &bus->devices, bus_list) { | |
1357 | if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE || | |
1358 | dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) | |
1359 | max = pci_scan_bridge(bus, dev, max, pass); | |
1360 | } | |
1361 | ||
1362 | /* | |
1363 | * We've scanned the bus and so we know all about what's on | |
1364 | * the other side of any bridges that may be on this bus plus | |
1365 | * any devices. | |
1366 | * | |
1367 | * Return how far we've got finding sub-buses. | |
1368 | */ | |
1369 | dev_dbg(&bus->dev, "bus scan returning with max=%02x\n", max); | |
1370 | return max; | |
1371 | } | |
1372 | ||
1373 | struct pci_bus * pci_create_bus(struct device *parent, | |
1374 | int bus, struct pci_ops *ops, void *sysdata) | |
1375 | { | |
1376 | int error; | |
1377 | struct pci_bus *b, *b2; | |
1378 | struct device *dev; | |
1379 | ||
1380 | b = pci_alloc_bus(); | |
1381 | if (!b) | |
1382 | return NULL; | |
1383 | ||
1384 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); | |
1385 | if (!dev){ | |
1386 | kfree(b); | |
1387 | return NULL; | |
1388 | } | |
1389 | ||
1390 | b->sysdata = sysdata; | |
1391 | b->ops = ops; | |
1392 | ||
1393 | b2 = pci_find_bus(pci_domain_nr(b), bus); | |
1394 | if (b2) { | |
1395 | /* If we already got to this bus through a different bridge, ignore it */ | |
1396 | dev_dbg(&b2->dev, "bus already known\n"); | |
1397 | goto err_out; | |
1398 | } | |
1399 | ||
1400 | down_write(&pci_bus_sem); | |
1401 | list_add_tail(&b->node, &pci_root_buses); | |
1402 | up_write(&pci_bus_sem); | |
1403 | ||
1404 | dev->parent = parent; | |
1405 | dev->release = pci_release_bus_bridge_dev; | |
1406 | dev_set_name(dev, "pci%04x:%02x", pci_domain_nr(b), bus); | |
1407 | error = device_register(dev); | |
1408 | if (error) | |
1409 | goto dev_reg_err; | |
1410 | b->bridge = get_device(dev); | |
1411 | device_enable_async_suspend(b->bridge); | |
1412 | ||
1413 | if (!parent) | |
1414 | set_dev_node(b->bridge, pcibus_to_node(b)); | |
1415 | ||
1416 | b->dev.class = &pcibus_class; | |
1417 | b->dev.parent = b->bridge; | |
1418 | dev_set_name(&b->dev, "%04x:%02x", pci_domain_nr(b), bus); | |
1419 | error = device_register(&b->dev); | |
1420 | if (error) | |
1421 | goto class_dev_reg_err; | |
1422 | ||
1423 | /* Create legacy_io and legacy_mem files for this bus */ | |
1424 | pci_create_legacy_files(b); | |
1425 | ||
1426 | b->number = b->secondary = bus; | |
1427 | b->resource[0] = &ioport_resource; | |
1428 | b->resource[1] = &iomem_resource; | |
1429 | ||
1430 | return b; | |
1431 | ||
1432 | class_dev_reg_err: | |
1433 | device_unregister(dev); | |
1434 | dev_reg_err: | |
1435 | down_write(&pci_bus_sem); | |
1436 | list_del(&b->node); | |
1437 | up_write(&pci_bus_sem); | |
1438 | err_out: | |
1439 | kfree(dev); | |
1440 | kfree(b); | |
1441 | return NULL; | |
1442 | } | |
1443 | ||
1444 | struct pci_bus * __devinit pci_scan_bus_parented(struct device *parent, | |
1445 | int bus, struct pci_ops *ops, void *sysdata) | |
1446 | { | |
1447 | struct pci_bus *b; | |
1448 | ||
1449 | b = pci_create_bus(parent, bus, ops, sysdata); | |
1450 | if (b) | |
1451 | b->subordinate = pci_scan_child_bus(b); | |
1452 | return b; | |
1453 | } | |
1454 | EXPORT_SYMBOL(pci_scan_bus_parented); | |
1455 | ||
1456 | #ifdef CONFIG_HOTPLUG | |
1457 | /** | |
1458 | * pci_rescan_bus - scan a PCI bus for devices. | |
1459 | * @bus: PCI bus to scan | |
1460 | * | |
1461 | * Scan a PCI bus and child buses for new devices, adds them, | |
1462 | * and enables them. | |
1463 | * | |
1464 | * Returns the max number of subordinate bus discovered. | |
1465 | */ | |
1466 | unsigned int __ref pci_rescan_bus(struct pci_bus *bus) | |
1467 | { | |
1468 | unsigned int max; | |
1469 | struct pci_dev *dev; | |
1470 | ||
1471 | max = pci_scan_child_bus(bus); | |
1472 | ||
1473 | down_read(&pci_bus_sem); | |
1474 | list_for_each_entry(dev, &bus->devices, bus_list) | |
1475 | if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE || | |
1476 | dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) | |
1477 | if (dev->subordinate) | |
1478 | pci_bus_size_bridges(dev->subordinate); | |
1479 | up_read(&pci_bus_sem); | |
1480 | ||
1481 | pci_bus_assign_resources(bus); | |
1482 | pci_enable_bridges(bus); | |
1483 | pci_bus_add_devices(bus); | |
1484 | ||
1485 | return max; | |
1486 | } | |
1487 | EXPORT_SYMBOL_GPL(pci_rescan_bus); | |
1488 | ||
1489 | EXPORT_SYMBOL(pci_add_new_bus); | |
1490 | EXPORT_SYMBOL(pci_scan_slot); | |
1491 | EXPORT_SYMBOL(pci_scan_bridge); | |
1492 | EXPORT_SYMBOL_GPL(pci_scan_child_bus); | |
1493 | #endif | |
1494 | ||
1495 | static int __init pci_sort_bf_cmp(const struct device *d_a, const struct device *d_b) | |
1496 | { | |
1497 | const struct pci_dev *a = to_pci_dev(d_a); | |
1498 | const struct pci_dev *b = to_pci_dev(d_b); | |
1499 | ||
1500 | if (pci_domain_nr(a->bus) < pci_domain_nr(b->bus)) return -1; | |
1501 | else if (pci_domain_nr(a->bus) > pci_domain_nr(b->bus)) return 1; | |
1502 | ||
1503 | if (a->bus->number < b->bus->number) return -1; | |
1504 | else if (a->bus->number > b->bus->number) return 1; | |
1505 | ||
1506 | if (a->devfn < b->devfn) return -1; | |
1507 | else if (a->devfn > b->devfn) return 1; | |
1508 | ||
1509 | return 0; | |
1510 | } | |
1511 | ||
1512 | void __init pci_sort_breadthfirst(void) | |
1513 | { | |
1514 | bus_sort_breadthfirst(&pci_bus_type, &pci_sort_bf_cmp); | |
1515 | } |