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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * probe.c - PCI detection and setup code | |
3 | */ | |
4 | ||
5 | #include <linux/kernel.h> | |
6 | #include <linux/delay.h> | |
7 | #include <linux/init.h> | |
8 | #include <linux/pci.h> | |
9 | #include <linux/slab.h> | |
10 | #include <linux/module.h> | |
11 | #include <linux/cpumask.h> | |
bc56b9e0 | 12 | #include "pci.h" |
1da177e4 LT |
13 | |
14 | #define CARDBUS_LATENCY_TIMER 176 /* secondary latency timer */ | |
15 | #define CARDBUS_RESERVE_BUSNR 3 | |
16 | #define PCI_CFG_SPACE_SIZE 256 | |
17 | #define PCI_CFG_SPACE_EXP_SIZE 4096 | |
18 | ||
19 | /* Ugh. Need to stop exporting this to modules. */ | |
20 | LIST_HEAD(pci_root_buses); | |
21 | EXPORT_SYMBOL(pci_root_buses); | |
22 | ||
23 | LIST_HEAD(pci_devices); | |
24 | ||
25 | #ifdef HAVE_PCI_LEGACY | |
26 | /** | |
27 | * pci_create_legacy_files - create legacy I/O port and memory files | |
28 | * @b: bus to create files under | |
29 | * | |
30 | * Some platforms allow access to legacy I/O port and ISA memory space on | |
31 | * a per-bus basis. This routine creates the files and ties them into | |
32 | * their associated read, write and mmap files from pci-sysfs.c | |
33 | */ | |
34 | static void pci_create_legacy_files(struct pci_bus *b) | |
35 | { | |
36 | b->legacy_io = kmalloc(sizeof(struct bin_attribute) * 2, | |
37 | GFP_ATOMIC); | |
38 | if (b->legacy_io) { | |
39 | memset(b->legacy_io, 0, sizeof(struct bin_attribute) * 2); | |
40 | b->legacy_io->attr.name = "legacy_io"; | |
41 | b->legacy_io->size = 0xffff; | |
42 | b->legacy_io->attr.mode = S_IRUSR | S_IWUSR; | |
43 | b->legacy_io->attr.owner = THIS_MODULE; | |
44 | b->legacy_io->read = pci_read_legacy_io; | |
45 | b->legacy_io->write = pci_write_legacy_io; | |
46 | class_device_create_bin_file(&b->class_dev, b->legacy_io); | |
47 | ||
48 | /* Allocated above after the legacy_io struct */ | |
49 | b->legacy_mem = b->legacy_io + 1; | |
50 | b->legacy_mem->attr.name = "legacy_mem"; | |
51 | b->legacy_mem->size = 1024*1024; | |
52 | b->legacy_mem->attr.mode = S_IRUSR | S_IWUSR; | |
53 | b->legacy_mem->attr.owner = THIS_MODULE; | |
54 | b->legacy_mem->mmap = pci_mmap_legacy_mem; | |
55 | class_device_create_bin_file(&b->class_dev, b->legacy_mem); | |
56 | } | |
57 | } | |
58 | ||
59 | void pci_remove_legacy_files(struct pci_bus *b) | |
60 | { | |
61 | if (b->legacy_io) { | |
62 | class_device_remove_bin_file(&b->class_dev, b->legacy_io); | |
63 | class_device_remove_bin_file(&b->class_dev, b->legacy_mem); | |
64 | kfree(b->legacy_io); /* both are allocated here */ | |
65 | } | |
66 | } | |
67 | #else /* !HAVE_PCI_LEGACY */ | |
68 | static inline void pci_create_legacy_files(struct pci_bus *bus) { return; } | |
69 | void pci_remove_legacy_files(struct pci_bus *bus) { return; } | |
70 | #endif /* HAVE_PCI_LEGACY */ | |
71 | ||
72 | /* | |
73 | * PCI Bus Class Devices | |
74 | */ | |
75 | static ssize_t pci_bus_show_cpuaffinity(struct class_device *class_dev, char *buf) | |
76 | { | |
77 | cpumask_t cpumask = pcibus_to_cpumask(to_pci_bus(class_dev)); | |
78 | int ret; | |
79 | ||
80 | ret = cpumask_scnprintf(buf, PAGE_SIZE, cpumask); | |
81 | if (ret < PAGE_SIZE) | |
82 | buf[ret++] = '\n'; | |
83 | return ret; | |
84 | } | |
85 | CLASS_DEVICE_ATTR(cpuaffinity, S_IRUGO, pci_bus_show_cpuaffinity, NULL); | |
86 | ||
87 | /* | |
88 | * PCI Bus Class | |
89 | */ | |
90 | static void release_pcibus_dev(struct class_device *class_dev) | |
91 | { | |
92 | struct pci_bus *pci_bus = to_pci_bus(class_dev); | |
93 | ||
94 | if (pci_bus->bridge) | |
95 | put_device(pci_bus->bridge); | |
96 | kfree(pci_bus); | |
97 | } | |
98 | ||
99 | static struct class pcibus_class = { | |
100 | .name = "pci_bus", | |
101 | .release = &release_pcibus_dev, | |
102 | }; | |
103 | ||
104 | static int __init pcibus_class_init(void) | |
105 | { | |
106 | return class_register(&pcibus_class); | |
107 | } | |
108 | postcore_initcall(pcibus_class_init); | |
109 | ||
110 | /* | |
111 | * Translate the low bits of the PCI base | |
112 | * to the resource type | |
113 | */ | |
114 | static inline unsigned int pci_calc_resource_flags(unsigned int flags) | |
115 | { | |
116 | if (flags & PCI_BASE_ADDRESS_SPACE_IO) | |
117 | return IORESOURCE_IO; | |
118 | ||
119 | if (flags & PCI_BASE_ADDRESS_MEM_PREFETCH) | |
120 | return IORESOURCE_MEM | IORESOURCE_PREFETCH; | |
121 | ||
122 | return IORESOURCE_MEM; | |
123 | } | |
124 | ||
125 | /* | |
126 | * Find the extent of a PCI decode.. | |
127 | */ | |
128 | static u32 pci_size(u32 base, u32 maxbase, unsigned long mask) | |
129 | { | |
130 | u32 size = mask & maxbase; /* Find the significant bits */ | |
131 | if (!size) | |
132 | return 0; | |
133 | ||
134 | /* Get the lowest of them to find the decode size, and | |
135 | from that the extent. */ | |
136 | size = (size & ~(size-1)) - 1; | |
137 | ||
138 | /* base == maxbase can be valid only if the BAR has | |
139 | already been programmed with all 1s. */ | |
140 | if (base == maxbase && ((base | size) & mask) != mask) | |
141 | return 0; | |
142 | ||
143 | return size; | |
144 | } | |
145 | ||
146 | static void pci_read_bases(struct pci_dev *dev, unsigned int howmany, int rom) | |
147 | { | |
148 | unsigned int pos, reg, next; | |
149 | u32 l, sz; | |
150 | struct resource *res; | |
151 | ||
152 | for(pos=0; pos<howmany; pos = next) { | |
153 | next = pos+1; | |
154 | res = &dev->resource[pos]; | |
155 | res->name = pci_name(dev); | |
156 | reg = PCI_BASE_ADDRESS_0 + (pos << 2); | |
157 | pci_read_config_dword(dev, reg, &l); | |
158 | pci_write_config_dword(dev, reg, ~0); | |
159 | pci_read_config_dword(dev, reg, &sz); | |
160 | pci_write_config_dword(dev, reg, l); | |
161 | if (!sz || sz == 0xffffffff) | |
162 | continue; | |
163 | if (l == 0xffffffff) | |
164 | l = 0; | |
165 | if ((l & PCI_BASE_ADDRESS_SPACE) == PCI_BASE_ADDRESS_SPACE_MEMORY) { | |
166 | sz = pci_size(l, sz, PCI_BASE_ADDRESS_MEM_MASK); | |
167 | if (!sz) | |
168 | continue; | |
169 | res->start = l & PCI_BASE_ADDRESS_MEM_MASK; | |
170 | res->flags |= l & ~PCI_BASE_ADDRESS_MEM_MASK; | |
171 | } else { | |
172 | sz = pci_size(l, sz, PCI_BASE_ADDRESS_IO_MASK & 0xffff); | |
173 | if (!sz) | |
174 | continue; | |
175 | res->start = l & PCI_BASE_ADDRESS_IO_MASK; | |
176 | res->flags |= l & ~PCI_BASE_ADDRESS_IO_MASK; | |
177 | } | |
178 | res->end = res->start + (unsigned long) sz; | |
179 | res->flags |= pci_calc_resource_flags(l); | |
180 | if ((l & (PCI_BASE_ADDRESS_SPACE | PCI_BASE_ADDRESS_MEM_TYPE_MASK)) | |
181 | == (PCI_BASE_ADDRESS_SPACE_MEMORY | PCI_BASE_ADDRESS_MEM_TYPE_64)) { | |
182 | pci_read_config_dword(dev, reg+4, &l); | |
183 | next++; | |
184 | #if BITS_PER_LONG == 64 | |
185 | res->start |= ((unsigned long) l) << 32; | |
186 | res->end = res->start + sz; | |
187 | pci_write_config_dword(dev, reg+4, ~0); | |
188 | pci_read_config_dword(dev, reg+4, &sz); | |
189 | pci_write_config_dword(dev, reg+4, l); | |
190 | sz = pci_size(l, sz, 0xffffffff); | |
191 | if (sz) { | |
192 | /* This BAR needs > 4GB? Wow. */ | |
193 | res->end |= (unsigned long)sz<<32; | |
194 | } | |
195 | #else | |
196 | if (l) { | |
197 | printk(KERN_ERR "PCI: Unable to handle 64-bit address for device %s\n", pci_name(dev)); | |
198 | res->start = 0; | |
199 | res->flags = 0; | |
200 | continue; | |
201 | } | |
202 | #endif | |
203 | } | |
204 | } | |
205 | if (rom) { | |
206 | dev->rom_base_reg = rom; | |
207 | res = &dev->resource[PCI_ROM_RESOURCE]; | |
208 | res->name = pci_name(dev); | |
209 | pci_read_config_dword(dev, rom, &l); | |
210 | pci_write_config_dword(dev, rom, ~PCI_ROM_ADDRESS_ENABLE); | |
211 | pci_read_config_dword(dev, rom, &sz); | |
212 | pci_write_config_dword(dev, rom, l); | |
213 | if (l == 0xffffffff) | |
214 | l = 0; | |
215 | if (sz && sz != 0xffffffff) { | |
216 | sz = pci_size(l, sz, PCI_ROM_ADDRESS_MASK); | |
217 | if (sz) { | |
218 | res->flags = (l & IORESOURCE_ROM_ENABLE) | | |
219 | IORESOURCE_MEM | IORESOURCE_PREFETCH | | |
220 | IORESOURCE_READONLY | IORESOURCE_CACHEABLE; | |
221 | res->start = l & PCI_ROM_ADDRESS_MASK; | |
222 | res->end = res->start + (unsigned long) sz; | |
223 | } | |
224 | } | |
225 | } | |
226 | } | |
227 | ||
228 | void __devinit pci_read_bridge_bases(struct pci_bus *child) | |
229 | { | |
230 | struct pci_dev *dev = child->self; | |
231 | u8 io_base_lo, io_limit_lo; | |
232 | u16 mem_base_lo, mem_limit_lo; | |
233 | unsigned long base, limit; | |
234 | struct resource *res; | |
235 | int i; | |
236 | ||
237 | if (!dev) /* It's a host bus, nothing to read */ | |
238 | return; | |
239 | ||
240 | if (dev->transparent) { | |
241 | printk(KERN_INFO "PCI: Transparent bridge - %s\n", pci_name(dev)); | |
242 | for(i = 0; i < PCI_BUS_NUM_RESOURCES; i++) | |
243 | child->resource[i] = child->parent->resource[i]; | |
244 | return; | |
245 | } | |
246 | ||
247 | for(i=0; i<3; i++) | |
248 | child->resource[i] = &dev->resource[PCI_BRIDGE_RESOURCES+i]; | |
249 | ||
250 | res = child->resource[0]; | |
251 | pci_read_config_byte(dev, PCI_IO_BASE, &io_base_lo); | |
252 | pci_read_config_byte(dev, PCI_IO_LIMIT, &io_limit_lo); | |
253 | base = (io_base_lo & PCI_IO_RANGE_MASK) << 8; | |
254 | limit = (io_limit_lo & PCI_IO_RANGE_MASK) << 8; | |
255 | ||
256 | if ((io_base_lo & PCI_IO_RANGE_TYPE_MASK) == PCI_IO_RANGE_TYPE_32) { | |
257 | u16 io_base_hi, io_limit_hi; | |
258 | pci_read_config_word(dev, PCI_IO_BASE_UPPER16, &io_base_hi); | |
259 | pci_read_config_word(dev, PCI_IO_LIMIT_UPPER16, &io_limit_hi); | |
260 | base |= (io_base_hi << 16); | |
261 | limit |= (io_limit_hi << 16); | |
262 | } | |
263 | ||
264 | if (base <= limit) { | |
265 | res->flags = (io_base_lo & PCI_IO_RANGE_TYPE_MASK) | IORESOURCE_IO; | |
266 | res->start = base; | |
267 | res->end = limit + 0xfff; | |
268 | } | |
269 | ||
270 | res = child->resource[1]; | |
271 | pci_read_config_word(dev, PCI_MEMORY_BASE, &mem_base_lo); | |
272 | pci_read_config_word(dev, PCI_MEMORY_LIMIT, &mem_limit_lo); | |
273 | base = (mem_base_lo & PCI_MEMORY_RANGE_MASK) << 16; | |
274 | limit = (mem_limit_lo & PCI_MEMORY_RANGE_MASK) << 16; | |
275 | if (base <= limit) { | |
276 | res->flags = (mem_base_lo & PCI_MEMORY_RANGE_TYPE_MASK) | IORESOURCE_MEM; | |
277 | res->start = base; | |
278 | res->end = limit + 0xfffff; | |
279 | } | |
280 | ||
281 | res = child->resource[2]; | |
282 | pci_read_config_word(dev, PCI_PREF_MEMORY_BASE, &mem_base_lo); | |
283 | pci_read_config_word(dev, PCI_PREF_MEMORY_LIMIT, &mem_limit_lo); | |
284 | base = (mem_base_lo & PCI_PREF_RANGE_MASK) << 16; | |
285 | limit = (mem_limit_lo & PCI_PREF_RANGE_MASK) << 16; | |
286 | ||
287 | if ((mem_base_lo & PCI_PREF_RANGE_TYPE_MASK) == PCI_PREF_RANGE_TYPE_64) { | |
288 | u32 mem_base_hi, mem_limit_hi; | |
289 | pci_read_config_dword(dev, PCI_PREF_BASE_UPPER32, &mem_base_hi); | |
290 | pci_read_config_dword(dev, PCI_PREF_LIMIT_UPPER32, &mem_limit_hi); | |
291 | ||
292 | /* | |
293 | * Some bridges set the base > limit by default, and some | |
294 | * (broken) BIOSes do not initialize them. If we find | |
295 | * this, just assume they are not being used. | |
296 | */ | |
297 | if (mem_base_hi <= mem_limit_hi) { | |
298 | #if BITS_PER_LONG == 64 | |
299 | base |= ((long) mem_base_hi) << 32; | |
300 | limit |= ((long) mem_limit_hi) << 32; | |
301 | #else | |
302 | if (mem_base_hi || mem_limit_hi) { | |
303 | printk(KERN_ERR "PCI: Unable to handle 64-bit address space for bridge %s\n", pci_name(dev)); | |
304 | return; | |
305 | } | |
306 | #endif | |
307 | } | |
308 | } | |
309 | if (base <= limit) { | |
310 | res->flags = (mem_base_lo & PCI_MEMORY_RANGE_TYPE_MASK) | IORESOURCE_MEM | IORESOURCE_PREFETCH; | |
311 | res->start = base; | |
312 | res->end = limit + 0xfffff; | |
313 | } | |
314 | } | |
315 | ||
316 | static struct pci_bus * __devinit pci_alloc_bus(void) | |
317 | { | |
318 | struct pci_bus *b; | |
319 | ||
320 | b = kmalloc(sizeof(*b), GFP_KERNEL); | |
321 | if (b) { | |
322 | memset(b, 0, sizeof(*b)); | |
323 | INIT_LIST_HEAD(&b->node); | |
324 | INIT_LIST_HEAD(&b->children); | |
325 | INIT_LIST_HEAD(&b->devices); | |
326 | } | |
327 | return b; | |
328 | } | |
329 | ||
330 | static struct pci_bus * __devinit | |
331 | pci_alloc_child_bus(struct pci_bus *parent, struct pci_dev *bridge, int busnr) | |
332 | { | |
333 | struct pci_bus *child; | |
334 | int i; | |
335 | ||
336 | /* | |
337 | * Allocate a new bus, and inherit stuff from the parent.. | |
338 | */ | |
339 | child = pci_alloc_bus(); | |
340 | if (!child) | |
341 | return NULL; | |
342 | ||
343 | child->self = bridge; | |
344 | child->parent = parent; | |
345 | child->ops = parent->ops; | |
346 | child->sysdata = parent->sysdata; | |
347 | child->bridge = get_device(&bridge->dev); | |
348 | ||
349 | child->class_dev.class = &pcibus_class; | |
350 | sprintf(child->class_dev.class_id, "%04x:%02x", pci_domain_nr(child), busnr); | |
351 | class_device_register(&child->class_dev); | |
352 | class_device_create_file(&child->class_dev, &class_device_attr_cpuaffinity); | |
353 | ||
354 | /* | |
355 | * Set up the primary, secondary and subordinate | |
356 | * bus numbers. | |
357 | */ | |
358 | child->number = child->secondary = busnr; | |
359 | child->primary = parent->secondary; | |
360 | child->subordinate = 0xff; | |
361 | ||
362 | /* Set up default resource pointers and names.. */ | |
363 | for (i = 0; i < 4; i++) { | |
364 | child->resource[i] = &bridge->resource[PCI_BRIDGE_RESOURCES+i]; | |
365 | child->resource[i]->name = child->name; | |
366 | } | |
367 | bridge->subordinate = child; | |
368 | ||
369 | return child; | |
370 | } | |
371 | ||
372 | struct pci_bus * __devinit pci_add_new_bus(struct pci_bus *parent, struct pci_dev *dev, int busnr) | |
373 | { | |
374 | struct pci_bus *child; | |
375 | ||
376 | child = pci_alloc_child_bus(parent, dev, busnr); | |
377 | if (child) | |
378 | list_add_tail(&child->node, &parent->children); | |
379 | return child; | |
380 | } | |
381 | ||
382 | static void pci_enable_crs(struct pci_dev *dev) | |
383 | { | |
384 | u16 cap, rpctl; | |
385 | int rpcap = pci_find_capability(dev, PCI_CAP_ID_EXP); | |
386 | if (!rpcap) | |
387 | return; | |
388 | ||
389 | pci_read_config_word(dev, rpcap + PCI_CAP_FLAGS, &cap); | |
390 | if (((cap & PCI_EXP_FLAGS_TYPE) >> 4) != PCI_EXP_TYPE_ROOT_PORT) | |
391 | return; | |
392 | ||
393 | pci_read_config_word(dev, rpcap + PCI_EXP_RTCTL, &rpctl); | |
394 | rpctl |= PCI_EXP_RTCTL_CRSSVE; | |
395 | pci_write_config_word(dev, rpcap + PCI_EXP_RTCTL, rpctl); | |
396 | } | |
397 | ||
398 | unsigned int __devinit pci_scan_child_bus(struct pci_bus *bus); | |
399 | ||
400 | /* | |
401 | * If it's a bridge, configure it and scan the bus behind it. | |
402 | * For CardBus bridges, we don't scan behind as the devices will | |
403 | * be handled by the bridge driver itself. | |
404 | * | |
405 | * We need to process bridges in two passes -- first we scan those | |
406 | * already configured by the BIOS and after we are done with all of | |
407 | * them, we proceed to assigning numbers to the remaining buses in | |
408 | * order to avoid overlaps between old and new bus numbers. | |
409 | */ | |
410 | int __devinit pci_scan_bridge(struct pci_bus *bus, struct pci_dev * dev, int max, int pass) | |
411 | { | |
412 | struct pci_bus *child; | |
413 | int is_cardbus = (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS); | |
414 | u32 buses; | |
415 | u16 bctl; | |
416 | ||
417 | pci_read_config_dword(dev, PCI_PRIMARY_BUS, &buses); | |
418 | ||
419 | pr_debug("PCI: Scanning behind PCI bridge %s, config %06x, pass %d\n", | |
420 | pci_name(dev), buses & 0xffffff, pass); | |
421 | ||
422 | /* Disable MasterAbortMode during probing to avoid reporting | |
423 | of bus errors (in some architectures) */ | |
424 | pci_read_config_word(dev, PCI_BRIDGE_CONTROL, &bctl); | |
425 | pci_write_config_word(dev, PCI_BRIDGE_CONTROL, | |
426 | bctl & ~PCI_BRIDGE_CTL_MASTER_ABORT); | |
427 | ||
428 | pci_enable_crs(dev); | |
429 | ||
430 | if ((buses & 0xffff00) && !pcibios_assign_all_busses() && !is_cardbus) { | |
431 | unsigned int cmax, busnr; | |
432 | /* | |
433 | * Bus already configured by firmware, process it in the first | |
434 | * pass and just note the configuration. | |
435 | */ | |
436 | if (pass) | |
437 | return max; | |
438 | busnr = (buses >> 8) & 0xFF; | |
439 | ||
440 | /* | |
441 | * If we already got to this bus through a different bridge, | |
442 | * ignore it. This can happen with the i450NX chipset. | |
443 | */ | |
444 | if (pci_find_bus(pci_domain_nr(bus), busnr)) { | |
445 | printk(KERN_INFO "PCI: Bus %04x:%02x already known\n", | |
446 | pci_domain_nr(bus), busnr); | |
447 | return max; | |
448 | } | |
449 | ||
450 | child = pci_alloc_child_bus(bus, dev, busnr); | |
451 | if (!child) | |
452 | return max; | |
453 | child->primary = buses & 0xFF; | |
454 | child->subordinate = (buses >> 16) & 0xFF; | |
455 | child->bridge_ctl = bctl; | |
456 | ||
457 | cmax = pci_scan_child_bus(child); | |
458 | if (cmax > max) | |
459 | max = cmax; | |
460 | if (child->subordinate > max) | |
461 | max = child->subordinate; | |
462 | } else { | |
463 | /* | |
464 | * We need to assign a number to this bus which we always | |
465 | * do in the second pass. | |
466 | */ | |
467 | if (!pass) | |
468 | return max; | |
469 | ||
470 | /* Clear errors */ | |
471 | pci_write_config_word(dev, PCI_STATUS, 0xffff); | |
472 | ||
473 | child = pci_alloc_child_bus(bus, dev, ++max); | |
474 | buses = (buses & 0xff000000) | |
475 | | ((unsigned int)(child->primary) << 0) | |
476 | | ((unsigned int)(child->secondary) << 8) | |
477 | | ((unsigned int)(child->subordinate) << 16); | |
478 | ||
479 | /* | |
480 | * yenta.c forces a secondary latency timer of 176. | |
481 | * Copy that behaviour here. | |
482 | */ | |
483 | if (is_cardbus) { | |
484 | buses &= ~0xff000000; | |
485 | buses |= CARDBUS_LATENCY_TIMER << 24; | |
486 | } | |
487 | ||
488 | /* | |
489 | * We need to blast all three values with a single write. | |
490 | */ | |
491 | pci_write_config_dword(dev, PCI_PRIMARY_BUS, buses); | |
492 | ||
493 | if (!is_cardbus) { | |
494 | child->bridge_ctl = PCI_BRIDGE_CTL_NO_ISA; | |
495 | ||
496 | /* Now we can scan all subordinate buses... */ | |
497 | max = pci_scan_child_bus(child); | |
498 | } else { | |
499 | /* | |
500 | * For CardBus bridges, we leave 4 bus numbers | |
501 | * as cards with a PCI-to-PCI bridge can be | |
502 | * inserted later. | |
503 | */ | |
504 | max += CARDBUS_RESERVE_BUSNR; | |
505 | } | |
506 | /* | |
507 | * Set the subordinate bus number to its real value. | |
508 | */ | |
509 | child->subordinate = max; | |
510 | pci_write_config_byte(dev, PCI_SUBORDINATE_BUS, max); | |
511 | } | |
512 | ||
513 | pci_write_config_word(dev, PCI_BRIDGE_CONTROL, bctl); | |
514 | ||
515 | sprintf(child->name, (is_cardbus ? "PCI CardBus #%02x" : "PCI Bus #%02x"), child->number); | |
516 | ||
517 | return max; | |
518 | } | |
519 | ||
520 | /* | |
521 | * Read interrupt line and base address registers. | |
522 | * The architecture-dependent code can tweak these, of course. | |
523 | */ | |
524 | static void pci_read_irq(struct pci_dev *dev) | |
525 | { | |
526 | unsigned char irq; | |
527 | ||
528 | pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &irq); | |
529 | if (irq) | |
530 | pci_read_config_byte(dev, PCI_INTERRUPT_LINE, &irq); | |
531 | dev->irq = irq; | |
532 | } | |
533 | ||
534 | /** | |
535 | * pci_setup_device - fill in class and map information of a device | |
536 | * @dev: the device structure to fill | |
537 | * | |
538 | * Initialize the device structure with information about the device's | |
539 | * vendor,class,memory and IO-space addresses,IRQ lines etc. | |
540 | * Called at initialisation of the PCI subsystem and by CardBus services. | |
541 | * Returns 0 on success and -1 if unknown type of device (not normal, bridge | |
542 | * or CardBus). | |
543 | */ | |
544 | static int pci_setup_device(struct pci_dev * dev) | |
545 | { | |
546 | u32 class; | |
547 | ||
548 | sprintf(pci_name(dev), "%04x:%02x:%02x.%d", pci_domain_nr(dev->bus), | |
549 | dev->bus->number, PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn)); | |
550 | ||
551 | pci_read_config_dword(dev, PCI_CLASS_REVISION, &class); | |
552 | class >>= 8; /* upper 3 bytes */ | |
553 | dev->class = class; | |
554 | class >>= 8; | |
555 | ||
556 | pr_debug("PCI: Found %s [%04x/%04x] %06x %02x\n", pci_name(dev), | |
557 | dev->vendor, dev->device, class, dev->hdr_type); | |
558 | ||
559 | /* "Unknown power state" */ | |
560 | dev->current_state = 4; | |
561 | ||
562 | /* Early fixups, before probing the BARs */ | |
563 | pci_fixup_device(pci_fixup_early, dev); | |
564 | class = dev->class >> 8; | |
565 | ||
566 | switch (dev->hdr_type) { /* header type */ | |
567 | case PCI_HEADER_TYPE_NORMAL: /* standard header */ | |
568 | if (class == PCI_CLASS_BRIDGE_PCI) | |
569 | goto bad; | |
570 | pci_read_irq(dev); | |
571 | pci_read_bases(dev, 6, PCI_ROM_ADDRESS); | |
572 | pci_read_config_word(dev, PCI_SUBSYSTEM_VENDOR_ID, &dev->subsystem_vendor); | |
573 | pci_read_config_word(dev, PCI_SUBSYSTEM_ID, &dev->subsystem_device); | |
574 | break; | |
575 | ||
576 | case PCI_HEADER_TYPE_BRIDGE: /* bridge header */ | |
577 | if (class != PCI_CLASS_BRIDGE_PCI) | |
578 | goto bad; | |
579 | /* The PCI-to-PCI bridge spec requires that subtractive | |
580 | decoding (i.e. transparent) bridge must have programming | |
581 | interface code of 0x01. */ | |
582 | dev->transparent = ((dev->class & 0xff) == 1); | |
583 | pci_read_bases(dev, 2, PCI_ROM_ADDRESS1); | |
584 | break; | |
585 | ||
586 | case PCI_HEADER_TYPE_CARDBUS: /* CardBus bridge header */ | |
587 | if (class != PCI_CLASS_BRIDGE_CARDBUS) | |
588 | goto bad; | |
589 | pci_read_irq(dev); | |
590 | pci_read_bases(dev, 1, 0); | |
591 | pci_read_config_word(dev, PCI_CB_SUBSYSTEM_VENDOR_ID, &dev->subsystem_vendor); | |
592 | pci_read_config_word(dev, PCI_CB_SUBSYSTEM_ID, &dev->subsystem_device); | |
593 | break; | |
594 | ||
595 | default: /* unknown header */ | |
596 | printk(KERN_ERR "PCI: device %s has unknown header type %02x, ignoring.\n", | |
597 | pci_name(dev), dev->hdr_type); | |
598 | return -1; | |
599 | ||
600 | bad: | |
601 | printk(KERN_ERR "PCI: %s: class %x doesn't match header type %02x. Ignoring class.\n", | |
602 | pci_name(dev), class, dev->hdr_type); | |
603 | dev->class = PCI_CLASS_NOT_DEFINED; | |
604 | } | |
605 | ||
606 | /* We found a fine healthy device, go go go... */ | |
607 | return 0; | |
608 | } | |
609 | ||
610 | /** | |
611 | * pci_release_dev - free a pci device structure when all users of it are finished. | |
612 | * @dev: device that's been disconnected | |
613 | * | |
614 | * Will be called only by the device core when all users of this pci device are | |
615 | * done. | |
616 | */ | |
617 | static void pci_release_dev(struct device *dev) | |
618 | { | |
619 | struct pci_dev *pci_dev; | |
620 | ||
621 | pci_dev = to_pci_dev(dev); | |
622 | kfree(pci_dev); | |
623 | } | |
624 | ||
625 | /** | |
626 | * pci_cfg_space_size - get the configuration space size of the PCI device. | |
627 | * | |
628 | * Regular PCI devices have 256 bytes, but PCI-X 2 and PCI Express devices | |
629 | * have 4096 bytes. Even if the device is capable, that doesn't mean we can | |
630 | * access it. Maybe we don't have a way to generate extended config space | |
631 | * accesses, or the device is behind a reverse Express bridge. So we try | |
632 | * reading the dword at 0x100 which must either be 0 or a valid extended | |
633 | * capability header. | |
634 | */ | |
635 | static int pci_cfg_space_size(struct pci_dev *dev) | |
636 | { | |
637 | int pos; | |
638 | u32 status; | |
639 | ||
640 | pos = pci_find_capability(dev, PCI_CAP_ID_EXP); | |
641 | if (!pos) { | |
642 | pos = pci_find_capability(dev, PCI_CAP_ID_PCIX); | |
643 | if (!pos) | |
644 | goto fail; | |
645 | ||
646 | pci_read_config_dword(dev, pos + PCI_X_STATUS, &status); | |
647 | if (!(status & (PCI_X_STATUS_266MHZ | PCI_X_STATUS_533MHZ))) | |
648 | goto fail; | |
649 | } | |
650 | ||
651 | if (pci_read_config_dword(dev, 256, &status) != PCIBIOS_SUCCESSFUL) | |
652 | goto fail; | |
653 | if (status == 0xffffffff) | |
654 | goto fail; | |
655 | ||
656 | return PCI_CFG_SPACE_EXP_SIZE; | |
657 | ||
658 | fail: | |
659 | return PCI_CFG_SPACE_SIZE; | |
660 | } | |
661 | ||
662 | static void pci_release_bus_bridge_dev(struct device *dev) | |
663 | { | |
664 | kfree(dev); | |
665 | } | |
666 | ||
667 | /* | |
668 | * Read the config data for a PCI device, sanity-check it | |
669 | * and fill in the dev structure... | |
670 | */ | |
671 | static struct pci_dev * __devinit | |
672 | pci_scan_device(struct pci_bus *bus, int devfn) | |
673 | { | |
674 | struct pci_dev *dev; | |
675 | u32 l; | |
676 | u8 hdr_type; | |
677 | int delay = 1; | |
678 | ||
679 | if (pci_bus_read_config_dword(bus, devfn, PCI_VENDOR_ID, &l)) | |
680 | return NULL; | |
681 | ||
682 | /* some broken boards return 0 or ~0 if a slot is empty: */ | |
683 | if (l == 0xffffffff || l == 0x00000000 || | |
684 | l == 0x0000ffff || l == 0xffff0000) | |
685 | return NULL; | |
686 | ||
687 | /* Configuration request Retry Status */ | |
688 | while (l == 0xffff0001) { | |
689 | msleep(delay); | |
690 | delay *= 2; | |
691 | if (pci_bus_read_config_dword(bus, devfn, PCI_VENDOR_ID, &l)) | |
692 | return NULL; | |
693 | /* Card hasn't responded in 60 seconds? Must be stuck. */ | |
694 | if (delay > 60 * 1000) { | |
695 | printk(KERN_WARNING "Device %04x:%02x:%02x.%d not " | |
696 | "responding\n", pci_domain_nr(bus), | |
697 | bus->number, PCI_SLOT(devfn), | |
698 | PCI_FUNC(devfn)); | |
699 | return NULL; | |
700 | } | |
701 | } | |
702 | ||
703 | if (pci_bus_read_config_byte(bus, devfn, PCI_HEADER_TYPE, &hdr_type)) | |
704 | return NULL; | |
705 | ||
706 | dev = kmalloc(sizeof(struct pci_dev), GFP_KERNEL); | |
707 | if (!dev) | |
708 | return NULL; | |
709 | ||
710 | memset(dev, 0, sizeof(struct pci_dev)); | |
711 | dev->bus = bus; | |
712 | dev->sysdata = bus->sysdata; | |
713 | dev->dev.parent = bus->bridge; | |
714 | dev->dev.bus = &pci_bus_type; | |
715 | dev->devfn = devfn; | |
716 | dev->hdr_type = hdr_type & 0x7f; | |
717 | dev->multifunction = !!(hdr_type & 0x80); | |
718 | dev->vendor = l & 0xffff; | |
719 | dev->device = (l >> 16) & 0xffff; | |
720 | dev->cfg_size = pci_cfg_space_size(dev); | |
721 | ||
722 | /* Assume 32-bit PCI; let 64-bit PCI cards (which are far rarer) | |
723 | set this higher, assuming the system even supports it. */ | |
724 | dev->dma_mask = 0xffffffff; | |
725 | if (pci_setup_device(dev) < 0) { | |
726 | kfree(dev); | |
727 | return NULL; | |
728 | } | |
729 | device_initialize(&dev->dev); | |
730 | dev->dev.release = pci_release_dev; | |
731 | pci_dev_get(dev); | |
732 | ||
733 | pci_name_device(dev); | |
734 | ||
735 | dev->dev.dma_mask = &dev->dma_mask; | |
736 | dev->dev.coherent_dma_mask = 0xffffffffull; | |
737 | ||
738 | return dev; | |
739 | } | |
740 | ||
741 | struct pci_dev * __devinit | |
742 | pci_scan_single_device(struct pci_bus *bus, int devfn) | |
743 | { | |
744 | struct pci_dev *dev; | |
745 | ||
746 | dev = pci_scan_device(bus, devfn); | |
747 | pci_scan_msi_device(dev); | |
748 | ||
749 | if (!dev) | |
750 | return NULL; | |
751 | ||
752 | /* Fix up broken headers */ | |
753 | pci_fixup_device(pci_fixup_header, dev); | |
754 | ||
755 | /* | |
756 | * Add the device to our list of discovered devices | |
757 | * and the bus list for fixup functions, etc. | |
758 | */ | |
759 | INIT_LIST_HEAD(&dev->global_list); | |
760 | list_add_tail(&dev->bus_list, &bus->devices); | |
761 | ||
762 | return dev; | |
763 | } | |
764 | ||
765 | /** | |
766 | * pci_scan_slot - scan a PCI slot on a bus for devices. | |
767 | * @bus: PCI bus to scan | |
768 | * @devfn: slot number to scan (must have zero function.) | |
769 | * | |
770 | * Scan a PCI slot on the specified PCI bus for devices, adding | |
771 | * discovered devices to the @bus->devices list. New devices | |
772 | * will have an empty dev->global_list head. | |
773 | */ | |
774 | int __devinit pci_scan_slot(struct pci_bus *bus, int devfn) | |
775 | { | |
776 | int func, nr = 0; | |
777 | int scan_all_fns; | |
778 | ||
779 | scan_all_fns = pcibios_scan_all_fns(bus, devfn); | |
780 | ||
781 | for (func = 0; func < 8; func++, devfn++) { | |
782 | struct pci_dev *dev; | |
783 | ||
784 | dev = pci_scan_single_device(bus, devfn); | |
785 | if (dev) { | |
786 | nr++; | |
787 | ||
788 | /* | |
789 | * If this is a single function device, | |
790 | * don't scan past the first function. | |
791 | */ | |
792 | if (!dev->multifunction) { | |
793 | if (func > 0) { | |
794 | dev->multifunction = 1; | |
795 | } else { | |
796 | break; | |
797 | } | |
798 | } | |
799 | } else { | |
800 | if (func == 0 && !scan_all_fns) | |
801 | break; | |
802 | } | |
803 | } | |
804 | return nr; | |
805 | } | |
806 | ||
807 | unsigned int __devinit pci_scan_child_bus(struct pci_bus *bus) | |
808 | { | |
809 | unsigned int devfn, pass, max = bus->secondary; | |
810 | struct pci_dev *dev; | |
811 | ||
812 | pr_debug("PCI: Scanning bus %04x:%02x\n", pci_domain_nr(bus), bus->number); | |
813 | ||
814 | /* Go find them, Rover! */ | |
815 | for (devfn = 0; devfn < 0x100; devfn += 8) | |
816 | pci_scan_slot(bus, devfn); | |
817 | ||
818 | /* | |
819 | * After performing arch-dependent fixup of the bus, look behind | |
820 | * all PCI-to-PCI bridges on this bus. | |
821 | */ | |
822 | pr_debug("PCI: Fixups for bus %04x:%02x\n", pci_domain_nr(bus), bus->number); | |
823 | pcibios_fixup_bus(bus); | |
824 | for (pass=0; pass < 2; pass++) | |
825 | list_for_each_entry(dev, &bus->devices, bus_list) { | |
826 | if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE || | |
827 | dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) | |
828 | max = pci_scan_bridge(bus, dev, max, pass); | |
829 | } | |
830 | ||
831 | /* | |
832 | * We've scanned the bus and so we know all about what's on | |
833 | * the other side of any bridges that may be on this bus plus | |
834 | * any devices. | |
835 | * | |
836 | * Return how far we've got finding sub-buses. | |
837 | */ | |
838 | pr_debug("PCI: Bus scan for %04x:%02x returning with max=%02x\n", | |
839 | pci_domain_nr(bus), bus->number, max); | |
840 | return max; | |
841 | } | |
842 | ||
843 | unsigned int __devinit pci_do_scan_bus(struct pci_bus *bus) | |
844 | { | |
845 | unsigned int max; | |
846 | ||
847 | max = pci_scan_child_bus(bus); | |
848 | ||
849 | /* | |
850 | * Make the discovered devices available. | |
851 | */ | |
852 | pci_bus_add_devices(bus); | |
853 | ||
854 | return max; | |
855 | } | |
856 | ||
857 | struct pci_bus * __devinit pci_scan_bus_parented(struct device *parent, int bus, struct pci_ops *ops, void *sysdata) | |
858 | { | |
859 | int error; | |
860 | struct pci_bus *b; | |
861 | struct device *dev; | |
862 | ||
863 | b = pci_alloc_bus(); | |
864 | if (!b) | |
865 | return NULL; | |
866 | ||
867 | dev = kmalloc(sizeof(*dev), GFP_KERNEL); | |
868 | if (!dev){ | |
869 | kfree(b); | |
870 | return NULL; | |
871 | } | |
872 | ||
873 | b->sysdata = sysdata; | |
874 | b->ops = ops; | |
875 | ||
876 | if (pci_find_bus(pci_domain_nr(b), bus)) { | |
877 | /* If we already got to this bus through a different bridge, ignore it */ | |
878 | pr_debug("PCI: Bus %04x:%02x already known\n", pci_domain_nr(b), bus); | |
879 | goto err_out; | |
880 | } | |
881 | list_add_tail(&b->node, &pci_root_buses); | |
882 | ||
883 | memset(dev, 0, sizeof(*dev)); | |
884 | dev->parent = parent; | |
885 | dev->release = pci_release_bus_bridge_dev; | |
886 | sprintf(dev->bus_id, "pci%04x:%02x", pci_domain_nr(b), bus); | |
887 | error = device_register(dev); | |
888 | if (error) | |
889 | goto dev_reg_err; | |
890 | b->bridge = get_device(dev); | |
891 | ||
892 | b->class_dev.class = &pcibus_class; | |
893 | sprintf(b->class_dev.class_id, "%04x:%02x", pci_domain_nr(b), bus); | |
894 | error = class_device_register(&b->class_dev); | |
895 | if (error) | |
896 | goto class_dev_reg_err; | |
897 | error = class_device_create_file(&b->class_dev, &class_device_attr_cpuaffinity); | |
898 | if (error) | |
899 | goto class_dev_create_file_err; | |
900 | ||
901 | /* Create legacy_io and legacy_mem files for this bus */ | |
902 | pci_create_legacy_files(b); | |
903 | ||
904 | error = sysfs_create_link(&b->class_dev.kobj, &b->bridge->kobj, "bridge"); | |
905 | if (error) | |
906 | goto sys_create_link_err; | |
907 | ||
908 | b->number = b->secondary = bus; | |
909 | b->resource[0] = &ioport_resource; | |
910 | b->resource[1] = &iomem_resource; | |
911 | ||
912 | b->subordinate = pci_scan_child_bus(b); | |
913 | ||
914 | pci_bus_add_devices(b); | |
915 | ||
916 | return b; | |
917 | ||
918 | sys_create_link_err: | |
919 | class_device_remove_file(&b->class_dev, &class_device_attr_cpuaffinity); | |
920 | class_dev_create_file_err: | |
921 | class_device_unregister(&b->class_dev); | |
922 | class_dev_reg_err: | |
923 | device_unregister(dev); | |
924 | dev_reg_err: | |
925 | list_del(&b->node); | |
926 | err_out: | |
927 | kfree(dev); | |
928 | kfree(b); | |
929 | return NULL; | |
930 | } | |
931 | EXPORT_SYMBOL(pci_scan_bus_parented); | |
932 | ||
933 | #ifdef CONFIG_HOTPLUG | |
934 | EXPORT_SYMBOL(pci_add_new_bus); | |
935 | EXPORT_SYMBOL(pci_do_scan_bus); | |
936 | EXPORT_SYMBOL(pci_scan_slot); | |
937 | EXPORT_SYMBOL(pci_scan_bridge); | |
938 | EXPORT_SYMBOL(pci_scan_single_device); | |
939 | EXPORT_SYMBOL_GPL(pci_scan_child_bus); | |
940 | #endif |