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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 | ||
ed4aaadb ZY |
25 | /* |
26 | * Some device drivers need know if pci is initiated. | |
27 | * Basically, we think pci is not initiated when there | |
28 | * is no device in list of pci_devices. | |
29 | */ | |
30 | int no_pci_devices(void) | |
31 | { | |
32 | return list_empty(&pci_devices); | |
33 | } | |
34 | ||
35 | EXPORT_SYMBOL(no_pci_devices); | |
36 | ||
1da177e4 LT |
37 | #ifdef HAVE_PCI_LEGACY |
38 | /** | |
39 | * pci_create_legacy_files - create legacy I/O port and memory files | |
40 | * @b: bus to create files under | |
41 | * | |
42 | * Some platforms allow access to legacy I/O port and ISA memory space on | |
43 | * a per-bus basis. This routine creates the files and ties them into | |
44 | * their associated read, write and mmap files from pci-sysfs.c | |
45 | */ | |
46 | static void pci_create_legacy_files(struct pci_bus *b) | |
47 | { | |
f5afe806 | 48 | b->legacy_io = kzalloc(sizeof(struct bin_attribute) * 2, |
1da177e4 LT |
49 | GFP_ATOMIC); |
50 | if (b->legacy_io) { | |
1da177e4 LT |
51 | b->legacy_io->attr.name = "legacy_io"; |
52 | b->legacy_io->size = 0xffff; | |
53 | b->legacy_io->attr.mode = S_IRUSR | S_IWUSR; | |
1da177e4 LT |
54 | b->legacy_io->read = pci_read_legacy_io; |
55 | b->legacy_io->write = pci_write_legacy_io; | |
56 | class_device_create_bin_file(&b->class_dev, b->legacy_io); | |
57 | ||
58 | /* Allocated above after the legacy_io struct */ | |
59 | b->legacy_mem = b->legacy_io + 1; | |
60 | b->legacy_mem->attr.name = "legacy_mem"; | |
61 | b->legacy_mem->size = 1024*1024; | |
62 | b->legacy_mem->attr.mode = S_IRUSR | S_IWUSR; | |
1da177e4 LT |
63 | b->legacy_mem->mmap = pci_mmap_legacy_mem; |
64 | class_device_create_bin_file(&b->class_dev, b->legacy_mem); | |
65 | } | |
66 | } | |
67 | ||
68 | void pci_remove_legacy_files(struct pci_bus *b) | |
69 | { | |
70 | if (b->legacy_io) { | |
71 | class_device_remove_bin_file(&b->class_dev, b->legacy_io); | |
72 | class_device_remove_bin_file(&b->class_dev, b->legacy_mem); | |
73 | kfree(b->legacy_io); /* both are allocated here */ | |
74 | } | |
75 | } | |
76 | #else /* !HAVE_PCI_LEGACY */ | |
77 | static inline void pci_create_legacy_files(struct pci_bus *bus) { return; } | |
78 | void pci_remove_legacy_files(struct pci_bus *bus) { return; } | |
79 | #endif /* HAVE_PCI_LEGACY */ | |
80 | ||
81 | /* | |
82 | * PCI Bus Class Devices | |
83 | */ | |
4327edf6 AC |
84 | static ssize_t pci_bus_show_cpuaffinity(struct class_device *class_dev, |
85 | char *buf) | |
1da177e4 | 86 | { |
1da177e4 | 87 | int ret; |
4327edf6 | 88 | cpumask_t cpumask; |
1da177e4 | 89 | |
4327edf6 | 90 | cpumask = pcibus_to_cpumask(to_pci_bus(class_dev)); |
1da177e4 LT |
91 | ret = cpumask_scnprintf(buf, PAGE_SIZE, cpumask); |
92 | if (ret < PAGE_SIZE) | |
93 | buf[ret++] = '\n'; | |
94 | return ret; | |
95 | } | |
96 | CLASS_DEVICE_ATTR(cpuaffinity, S_IRUGO, pci_bus_show_cpuaffinity, NULL); | |
97 | ||
98 | /* | |
99 | * PCI Bus Class | |
100 | */ | |
101 | static void release_pcibus_dev(struct class_device *class_dev) | |
102 | { | |
103 | struct pci_bus *pci_bus = to_pci_bus(class_dev); | |
104 | ||
105 | if (pci_bus->bridge) | |
106 | put_device(pci_bus->bridge); | |
107 | kfree(pci_bus); | |
108 | } | |
109 | ||
110 | static struct class pcibus_class = { | |
111 | .name = "pci_bus", | |
112 | .release = &release_pcibus_dev, | |
113 | }; | |
114 | ||
115 | static int __init pcibus_class_init(void) | |
116 | { | |
117 | return class_register(&pcibus_class); | |
118 | } | |
119 | postcore_initcall(pcibus_class_init); | |
120 | ||
121 | /* | |
122 | * Translate the low bits of the PCI base | |
123 | * to the resource type | |
124 | */ | |
125 | static inline unsigned int pci_calc_resource_flags(unsigned int flags) | |
126 | { | |
127 | if (flags & PCI_BASE_ADDRESS_SPACE_IO) | |
128 | return IORESOURCE_IO; | |
129 | ||
130 | if (flags & PCI_BASE_ADDRESS_MEM_PREFETCH) | |
131 | return IORESOURCE_MEM | IORESOURCE_PREFETCH; | |
132 | ||
133 | return IORESOURCE_MEM; | |
134 | } | |
135 | ||
136 | /* | |
137 | * Find the extent of a PCI decode.. | |
138 | */ | |
f797f9cc | 139 | static u32 pci_size(u32 base, u32 maxbase, u32 mask) |
1da177e4 LT |
140 | { |
141 | u32 size = mask & maxbase; /* Find the significant bits */ | |
142 | if (!size) | |
143 | return 0; | |
144 | ||
145 | /* Get the lowest of them to find the decode size, and | |
146 | from that the extent. */ | |
147 | size = (size & ~(size-1)) - 1; | |
148 | ||
149 | /* base == maxbase can be valid only if the BAR has | |
150 | already been programmed with all 1s. */ | |
151 | if (base == maxbase && ((base | size) & mask) != mask) | |
152 | return 0; | |
153 | ||
154 | return size; | |
155 | } | |
156 | ||
07eddf3d YL |
157 | static u64 pci_size64(u64 base, u64 maxbase, u64 mask) |
158 | { | |
159 | u64 size = mask & maxbase; /* Find the significant bits */ | |
160 | if (!size) | |
161 | return 0; | |
162 | ||
163 | /* Get the lowest of them to find the decode size, and | |
164 | from that the extent. */ | |
165 | size = (size & ~(size-1)) - 1; | |
166 | ||
167 | /* base == maxbase can be valid only if the BAR has | |
168 | already been programmed with all 1s. */ | |
169 | if (base == maxbase && ((base | size) & mask) != mask) | |
170 | return 0; | |
171 | ||
172 | return size; | |
173 | } | |
174 | ||
175 | static inline int is_64bit_memory(u32 mask) | |
176 | { | |
177 | if ((mask & (PCI_BASE_ADDRESS_SPACE|PCI_BASE_ADDRESS_MEM_TYPE_MASK)) == | |
178 | (PCI_BASE_ADDRESS_SPACE_MEMORY|PCI_BASE_ADDRESS_MEM_TYPE_64)) | |
179 | return 1; | |
180 | return 0; | |
181 | } | |
182 | ||
1da177e4 LT |
183 | static void pci_read_bases(struct pci_dev *dev, unsigned int howmany, int rom) |
184 | { | |
185 | unsigned int pos, reg, next; | |
186 | u32 l, sz; | |
187 | struct resource *res; | |
188 | ||
189 | for(pos=0; pos<howmany; pos = next) { | |
07eddf3d YL |
190 | u64 l64; |
191 | u64 sz64; | |
192 | u32 raw_sz; | |
193 | ||
1da177e4 LT |
194 | next = pos+1; |
195 | res = &dev->resource[pos]; | |
196 | res->name = pci_name(dev); | |
197 | reg = PCI_BASE_ADDRESS_0 + (pos << 2); | |
198 | pci_read_config_dword(dev, reg, &l); | |
199 | pci_write_config_dword(dev, reg, ~0); | |
200 | pci_read_config_dword(dev, reg, &sz); | |
201 | pci_write_config_dword(dev, reg, l); | |
202 | if (!sz || sz == 0xffffffff) | |
203 | continue; | |
204 | if (l == 0xffffffff) | |
205 | l = 0; | |
07eddf3d YL |
206 | raw_sz = sz; |
207 | if ((l & PCI_BASE_ADDRESS_SPACE) == | |
208 | PCI_BASE_ADDRESS_SPACE_MEMORY) { | |
3c6de929 | 209 | sz = pci_size(l, sz, (u32)PCI_BASE_ADDRESS_MEM_MASK); |
07eddf3d YL |
210 | /* |
211 | * For 64bit prefetchable memory sz could be 0, if the | |
212 | * real size is bigger than 4G, so we need to check | |
213 | * szhi for that. | |
214 | */ | |
215 | if (!is_64bit_memory(l) && !sz) | |
1da177e4 LT |
216 | continue; |
217 | res->start = l & PCI_BASE_ADDRESS_MEM_MASK; | |
218 | res->flags |= l & ~PCI_BASE_ADDRESS_MEM_MASK; | |
219 | } else { | |
220 | sz = pci_size(l, sz, PCI_BASE_ADDRESS_IO_MASK & 0xffff); | |
221 | if (!sz) | |
222 | continue; | |
223 | res->start = l & PCI_BASE_ADDRESS_IO_MASK; | |
224 | res->flags |= l & ~PCI_BASE_ADDRESS_IO_MASK; | |
225 | } | |
226 | res->end = res->start + (unsigned long) sz; | |
227 | res->flags |= pci_calc_resource_flags(l); | |
07eddf3d | 228 | if (is_64bit_memory(l)) { |
17d6dc8f | 229 | u32 szhi, lhi; |
07eddf3d | 230 | |
17d6dc8f PA |
231 | pci_read_config_dword(dev, reg+4, &lhi); |
232 | pci_write_config_dword(dev, reg+4, ~0); | |
233 | pci_read_config_dword(dev, reg+4, &szhi); | |
234 | pci_write_config_dword(dev, reg+4, lhi); | |
07eddf3d YL |
235 | sz64 = ((u64)szhi << 32) | raw_sz; |
236 | l64 = ((u64)lhi << 32) | l; | |
237 | sz64 = pci_size64(l64, sz64, PCI_BASE_ADDRESS_MEM_MASK); | |
1da177e4 LT |
238 | next++; |
239 | #if BITS_PER_LONG == 64 | |
07eddf3d YL |
240 | if (!sz64) { |
241 | res->start = 0; | |
242 | res->end = 0; | |
243 | res->flags = 0; | |
244 | continue; | |
1da177e4 | 245 | } |
07eddf3d YL |
246 | res->start = l64 & PCI_BASE_ADDRESS_MEM_MASK; |
247 | res->end = res->start + sz64; | |
1da177e4 | 248 | #else |
07eddf3d YL |
249 | if (sz64 > 0x100000000ULL) { |
250 | printk(KERN_ERR "PCI: Unable to handle 64-bit " | |
251 | "BAR for device %s\n", pci_name(dev)); | |
1da177e4 LT |
252 | res->start = 0; |
253 | res->flags = 0; | |
ea28502d | 254 | } else if (lhi) { |
17d6dc8f | 255 | /* 64-bit wide address, treat as disabled */ |
07eddf3d YL |
256 | pci_write_config_dword(dev, reg, |
257 | l & ~(u32)PCI_BASE_ADDRESS_MEM_MASK); | |
17d6dc8f PA |
258 | pci_write_config_dword(dev, reg+4, 0); |
259 | res->start = 0; | |
260 | res->end = sz; | |
1da177e4 LT |
261 | } |
262 | #endif | |
263 | } | |
264 | } | |
265 | if (rom) { | |
266 | dev->rom_base_reg = rom; | |
267 | res = &dev->resource[PCI_ROM_RESOURCE]; | |
268 | res->name = pci_name(dev); | |
269 | pci_read_config_dword(dev, rom, &l); | |
270 | pci_write_config_dword(dev, rom, ~PCI_ROM_ADDRESS_ENABLE); | |
271 | pci_read_config_dword(dev, rom, &sz); | |
272 | pci_write_config_dword(dev, rom, l); | |
273 | if (l == 0xffffffff) | |
274 | l = 0; | |
275 | if (sz && sz != 0xffffffff) { | |
3c6de929 | 276 | sz = pci_size(l, sz, (u32)PCI_ROM_ADDRESS_MASK); |
1da177e4 LT |
277 | if (sz) { |
278 | res->flags = (l & IORESOURCE_ROM_ENABLE) | | |
fd64cb46 | 279 | IORESOURCE_MEM | IORESOURCE_READONLY; |
1da177e4 LT |
280 | res->start = l & PCI_ROM_ADDRESS_MASK; |
281 | res->end = res->start + (unsigned long) sz; | |
282 | } | |
283 | } | |
284 | } | |
285 | } | |
286 | ||
e365c3e7 | 287 | void pci_read_bridge_bases(struct pci_bus *child) |
1da177e4 LT |
288 | { |
289 | struct pci_dev *dev = child->self; | |
290 | u8 io_base_lo, io_limit_lo; | |
291 | u16 mem_base_lo, mem_limit_lo; | |
292 | unsigned long base, limit; | |
293 | struct resource *res; | |
294 | int i; | |
295 | ||
296 | if (!dev) /* It's a host bus, nothing to read */ | |
297 | return; | |
298 | ||
299 | if (dev->transparent) { | |
300 | printk(KERN_INFO "PCI: Transparent bridge - %s\n", pci_name(dev)); | |
90b54929 IK |
301 | for(i = 3; i < PCI_BUS_NUM_RESOURCES; i++) |
302 | child->resource[i] = child->parent->resource[i - 3]; | |
1da177e4 LT |
303 | } |
304 | ||
305 | for(i=0; i<3; i++) | |
306 | child->resource[i] = &dev->resource[PCI_BRIDGE_RESOURCES+i]; | |
307 | ||
308 | res = child->resource[0]; | |
309 | pci_read_config_byte(dev, PCI_IO_BASE, &io_base_lo); | |
310 | pci_read_config_byte(dev, PCI_IO_LIMIT, &io_limit_lo); | |
311 | base = (io_base_lo & PCI_IO_RANGE_MASK) << 8; | |
312 | limit = (io_limit_lo & PCI_IO_RANGE_MASK) << 8; | |
313 | ||
314 | if ((io_base_lo & PCI_IO_RANGE_TYPE_MASK) == PCI_IO_RANGE_TYPE_32) { | |
315 | u16 io_base_hi, io_limit_hi; | |
316 | pci_read_config_word(dev, PCI_IO_BASE_UPPER16, &io_base_hi); | |
317 | pci_read_config_word(dev, PCI_IO_LIMIT_UPPER16, &io_limit_hi); | |
318 | base |= (io_base_hi << 16); | |
319 | limit |= (io_limit_hi << 16); | |
320 | } | |
321 | ||
322 | if (base <= limit) { | |
323 | res->flags = (io_base_lo & PCI_IO_RANGE_TYPE_MASK) | IORESOURCE_IO; | |
9d265124 DY |
324 | if (!res->start) |
325 | res->start = base; | |
326 | if (!res->end) | |
327 | res->end = limit + 0xfff; | |
1da177e4 LT |
328 | } |
329 | ||
330 | res = child->resource[1]; | |
331 | pci_read_config_word(dev, PCI_MEMORY_BASE, &mem_base_lo); | |
332 | pci_read_config_word(dev, PCI_MEMORY_LIMIT, &mem_limit_lo); | |
333 | base = (mem_base_lo & PCI_MEMORY_RANGE_MASK) << 16; | |
334 | limit = (mem_limit_lo & PCI_MEMORY_RANGE_MASK) << 16; | |
335 | if (base <= limit) { | |
336 | res->flags = (mem_base_lo & PCI_MEMORY_RANGE_TYPE_MASK) | IORESOURCE_MEM; | |
337 | res->start = base; | |
338 | res->end = limit + 0xfffff; | |
339 | } | |
340 | ||
341 | res = child->resource[2]; | |
342 | pci_read_config_word(dev, PCI_PREF_MEMORY_BASE, &mem_base_lo); | |
343 | pci_read_config_word(dev, PCI_PREF_MEMORY_LIMIT, &mem_limit_lo); | |
344 | base = (mem_base_lo & PCI_PREF_RANGE_MASK) << 16; | |
345 | limit = (mem_limit_lo & PCI_PREF_RANGE_MASK) << 16; | |
346 | ||
347 | if ((mem_base_lo & PCI_PREF_RANGE_TYPE_MASK) == PCI_PREF_RANGE_TYPE_64) { | |
348 | u32 mem_base_hi, mem_limit_hi; | |
349 | pci_read_config_dword(dev, PCI_PREF_BASE_UPPER32, &mem_base_hi); | |
350 | pci_read_config_dword(dev, PCI_PREF_LIMIT_UPPER32, &mem_limit_hi); | |
351 | ||
352 | /* | |
353 | * Some bridges set the base > limit by default, and some | |
354 | * (broken) BIOSes do not initialize them. If we find | |
355 | * this, just assume they are not being used. | |
356 | */ | |
357 | if (mem_base_hi <= mem_limit_hi) { | |
358 | #if BITS_PER_LONG == 64 | |
359 | base |= ((long) mem_base_hi) << 32; | |
360 | limit |= ((long) mem_limit_hi) << 32; | |
361 | #else | |
362 | if (mem_base_hi || mem_limit_hi) { | |
363 | printk(KERN_ERR "PCI: Unable to handle 64-bit address space for bridge %s\n", pci_name(dev)); | |
364 | return; | |
365 | } | |
366 | #endif | |
367 | } | |
368 | } | |
369 | if (base <= limit) { | |
370 | res->flags = (mem_base_lo & PCI_MEMORY_RANGE_TYPE_MASK) | IORESOURCE_MEM | IORESOURCE_PREFETCH; | |
371 | res->start = base; | |
372 | res->end = limit + 0xfffff; | |
373 | } | |
374 | } | |
375 | ||
96bde06a | 376 | static struct pci_bus * pci_alloc_bus(void) |
1da177e4 LT |
377 | { |
378 | struct pci_bus *b; | |
379 | ||
f5afe806 | 380 | b = kzalloc(sizeof(*b), GFP_KERNEL); |
1da177e4 | 381 | if (b) { |
1da177e4 LT |
382 | INIT_LIST_HEAD(&b->node); |
383 | INIT_LIST_HEAD(&b->children); | |
384 | INIT_LIST_HEAD(&b->devices); | |
385 | } | |
386 | return b; | |
387 | } | |
388 | ||
389 | static struct pci_bus * __devinit | |
390 | pci_alloc_child_bus(struct pci_bus *parent, struct pci_dev *bridge, int busnr) | |
391 | { | |
392 | struct pci_bus *child; | |
393 | int i; | |
b19441af | 394 | int retval; |
1da177e4 LT |
395 | |
396 | /* | |
397 | * Allocate a new bus, and inherit stuff from the parent.. | |
398 | */ | |
399 | child = pci_alloc_bus(); | |
400 | if (!child) | |
401 | return NULL; | |
402 | ||
403 | child->self = bridge; | |
404 | child->parent = parent; | |
405 | child->ops = parent->ops; | |
406 | child->sysdata = parent->sysdata; | |
6e325a62 | 407 | child->bus_flags = parent->bus_flags; |
1da177e4 LT |
408 | child->bridge = get_device(&bridge->dev); |
409 | ||
410 | child->class_dev.class = &pcibus_class; | |
411 | sprintf(child->class_dev.class_id, "%04x:%02x", pci_domain_nr(child), busnr); | |
b19441af GKH |
412 | retval = class_device_register(&child->class_dev); |
413 | if (retval) | |
414 | goto error_register; | |
415 | retval = class_device_create_file(&child->class_dev, | |
416 | &class_device_attr_cpuaffinity); | |
417 | if (retval) | |
418 | goto error_file_create; | |
1da177e4 LT |
419 | |
420 | /* | |
421 | * Set up the primary, secondary and subordinate | |
422 | * bus numbers. | |
423 | */ | |
424 | child->number = child->secondary = busnr; | |
425 | child->primary = parent->secondary; | |
426 | child->subordinate = 0xff; | |
427 | ||
428 | /* Set up default resource pointers and names.. */ | |
429 | for (i = 0; i < 4; i++) { | |
430 | child->resource[i] = &bridge->resource[PCI_BRIDGE_RESOURCES+i]; | |
431 | child->resource[i]->name = child->name; | |
432 | } | |
433 | bridge->subordinate = child; | |
434 | ||
435 | return child; | |
b19441af GKH |
436 | |
437 | error_file_create: | |
438 | class_device_unregister(&child->class_dev); | |
439 | error_register: | |
440 | kfree(child); | |
441 | return NULL; | |
1da177e4 LT |
442 | } |
443 | ||
96bde06a | 444 | struct pci_bus *pci_add_new_bus(struct pci_bus *parent, struct pci_dev *dev, int busnr) |
1da177e4 LT |
445 | { |
446 | struct pci_bus *child; | |
447 | ||
448 | child = pci_alloc_child_bus(parent, dev, busnr); | |
e4ea9bb7 | 449 | if (child) { |
d71374da | 450 | down_write(&pci_bus_sem); |
1da177e4 | 451 | list_add_tail(&child->node, &parent->children); |
d71374da | 452 | up_write(&pci_bus_sem); |
e4ea9bb7 | 453 | } |
1da177e4 LT |
454 | return child; |
455 | } | |
456 | ||
457 | static void pci_enable_crs(struct pci_dev *dev) | |
458 | { | |
459 | u16 cap, rpctl; | |
460 | int rpcap = pci_find_capability(dev, PCI_CAP_ID_EXP); | |
461 | if (!rpcap) | |
462 | return; | |
463 | ||
464 | pci_read_config_word(dev, rpcap + PCI_CAP_FLAGS, &cap); | |
465 | if (((cap & PCI_EXP_FLAGS_TYPE) >> 4) != PCI_EXP_TYPE_ROOT_PORT) | |
466 | return; | |
467 | ||
468 | pci_read_config_word(dev, rpcap + PCI_EXP_RTCTL, &rpctl); | |
469 | rpctl |= PCI_EXP_RTCTL_CRSSVE; | |
470 | pci_write_config_word(dev, rpcap + PCI_EXP_RTCTL, rpctl); | |
471 | } | |
472 | ||
96bde06a | 473 | static void pci_fixup_parent_subordinate_busnr(struct pci_bus *child, int max) |
26f674ae GKH |
474 | { |
475 | struct pci_bus *parent = child->parent; | |
12f44f46 IK |
476 | |
477 | /* Attempts to fix that up are really dangerous unless | |
478 | we're going to re-assign all bus numbers. */ | |
479 | if (!pcibios_assign_all_busses()) | |
480 | return; | |
481 | ||
26f674ae GKH |
482 | while (parent->parent && parent->subordinate < max) { |
483 | parent->subordinate = max; | |
484 | pci_write_config_byte(parent->self, PCI_SUBORDINATE_BUS, max); | |
485 | parent = parent->parent; | |
486 | } | |
487 | } | |
488 | ||
96bde06a | 489 | unsigned int pci_scan_child_bus(struct pci_bus *bus); |
1da177e4 LT |
490 | |
491 | /* | |
492 | * If it's a bridge, configure it and scan the bus behind it. | |
493 | * For CardBus bridges, we don't scan behind as the devices will | |
494 | * be handled by the bridge driver itself. | |
495 | * | |
496 | * We need to process bridges in two passes -- first we scan those | |
497 | * already configured by the BIOS and after we are done with all of | |
498 | * them, we proceed to assigning numbers to the remaining buses in | |
499 | * order to avoid overlaps between old and new bus numbers. | |
500 | */ | |
96bde06a | 501 | int pci_scan_bridge(struct pci_bus *bus, struct pci_dev * dev, int max, int pass) |
1da177e4 LT |
502 | { |
503 | struct pci_bus *child; | |
504 | int is_cardbus = (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS); | |
49887941 | 505 | u32 buses, i, j = 0; |
1da177e4 LT |
506 | u16 bctl; |
507 | ||
508 | pci_read_config_dword(dev, PCI_PRIMARY_BUS, &buses); | |
509 | ||
510 | pr_debug("PCI: Scanning behind PCI bridge %s, config %06x, pass %d\n", | |
511 | pci_name(dev), buses & 0xffffff, pass); | |
512 | ||
513 | /* Disable MasterAbortMode during probing to avoid reporting | |
514 | of bus errors (in some architectures) */ | |
515 | pci_read_config_word(dev, PCI_BRIDGE_CONTROL, &bctl); | |
516 | pci_write_config_word(dev, PCI_BRIDGE_CONTROL, | |
517 | bctl & ~PCI_BRIDGE_CTL_MASTER_ABORT); | |
518 | ||
519 | pci_enable_crs(dev); | |
520 | ||
521 | if ((buses & 0xffff00) && !pcibios_assign_all_busses() && !is_cardbus) { | |
522 | unsigned int cmax, busnr; | |
523 | /* | |
524 | * Bus already configured by firmware, process it in the first | |
525 | * pass and just note the configuration. | |
526 | */ | |
527 | if (pass) | |
bbe8f9a3 | 528 | goto out; |
1da177e4 LT |
529 | busnr = (buses >> 8) & 0xFF; |
530 | ||
531 | /* | |
532 | * If we already got to this bus through a different bridge, | |
533 | * ignore it. This can happen with the i450NX chipset. | |
534 | */ | |
535 | if (pci_find_bus(pci_domain_nr(bus), busnr)) { | |
536 | printk(KERN_INFO "PCI: Bus %04x:%02x already known\n", | |
537 | pci_domain_nr(bus), busnr); | |
bbe8f9a3 | 538 | goto out; |
1da177e4 LT |
539 | } |
540 | ||
6ef6f0e3 | 541 | child = pci_add_new_bus(bus, dev, busnr); |
1da177e4 | 542 | if (!child) |
bbe8f9a3 | 543 | goto out; |
1da177e4 LT |
544 | child->primary = buses & 0xFF; |
545 | child->subordinate = (buses >> 16) & 0xFF; | |
11949255 | 546 | child->bridge_ctl = bctl; |
1da177e4 LT |
547 | |
548 | cmax = pci_scan_child_bus(child); | |
549 | if (cmax > max) | |
550 | max = cmax; | |
551 | if (child->subordinate > max) | |
552 | max = child->subordinate; | |
553 | } else { | |
554 | /* | |
555 | * We need to assign a number to this bus which we always | |
556 | * do in the second pass. | |
557 | */ | |
12f44f46 IK |
558 | if (!pass) { |
559 | if (pcibios_assign_all_busses()) | |
560 | /* Temporarily disable forwarding of the | |
561 | configuration cycles on all bridges in | |
562 | this bus segment to avoid possible | |
563 | conflicts in the second pass between two | |
564 | bridges programmed with overlapping | |
565 | bus ranges. */ | |
566 | pci_write_config_dword(dev, PCI_PRIMARY_BUS, | |
567 | buses & ~0xffffff); | |
bbe8f9a3 | 568 | goto out; |
12f44f46 | 569 | } |
1da177e4 LT |
570 | |
571 | /* Clear errors */ | |
572 | pci_write_config_word(dev, PCI_STATUS, 0xffff); | |
573 | ||
cc57450f RS |
574 | /* Prevent assigning a bus number that already exists. |
575 | * This can happen when a bridge is hot-plugged */ | |
576 | if (pci_find_bus(pci_domain_nr(bus), max+1)) | |
bbe8f9a3 | 577 | goto out; |
6ef6f0e3 | 578 | child = pci_add_new_bus(bus, dev, ++max); |
1da177e4 LT |
579 | buses = (buses & 0xff000000) |
580 | | ((unsigned int)(child->primary) << 0) | |
581 | | ((unsigned int)(child->secondary) << 8) | |
582 | | ((unsigned int)(child->subordinate) << 16); | |
583 | ||
584 | /* | |
585 | * yenta.c forces a secondary latency timer of 176. | |
586 | * Copy that behaviour here. | |
587 | */ | |
588 | if (is_cardbus) { | |
589 | buses &= ~0xff000000; | |
590 | buses |= CARDBUS_LATENCY_TIMER << 24; | |
591 | } | |
592 | ||
593 | /* | |
594 | * We need to blast all three values with a single write. | |
595 | */ | |
596 | pci_write_config_dword(dev, PCI_PRIMARY_BUS, buses); | |
597 | ||
598 | if (!is_cardbus) { | |
11949255 | 599 | child->bridge_ctl = bctl; |
26f674ae GKH |
600 | /* |
601 | * Adjust subordinate busnr in parent buses. | |
602 | * We do this before scanning for children because | |
603 | * some devices may not be detected if the bios | |
604 | * was lazy. | |
605 | */ | |
606 | pci_fixup_parent_subordinate_busnr(child, max); | |
1da177e4 LT |
607 | /* Now we can scan all subordinate buses... */ |
608 | max = pci_scan_child_bus(child); | |
e3ac86d8 KA |
609 | /* |
610 | * now fix it up again since we have found | |
611 | * the real value of max. | |
612 | */ | |
613 | pci_fixup_parent_subordinate_busnr(child, max); | |
1da177e4 LT |
614 | } else { |
615 | /* | |
616 | * For CardBus bridges, we leave 4 bus numbers | |
617 | * as cards with a PCI-to-PCI bridge can be | |
618 | * inserted later. | |
619 | */ | |
49887941 DB |
620 | for (i=0; i<CARDBUS_RESERVE_BUSNR; i++) { |
621 | struct pci_bus *parent = bus; | |
cc57450f RS |
622 | if (pci_find_bus(pci_domain_nr(bus), |
623 | max+i+1)) | |
624 | break; | |
49887941 DB |
625 | while (parent->parent) { |
626 | if ((!pcibios_assign_all_busses()) && | |
627 | (parent->subordinate > max) && | |
628 | (parent->subordinate <= max+i)) { | |
629 | j = 1; | |
630 | } | |
631 | parent = parent->parent; | |
632 | } | |
633 | if (j) { | |
634 | /* | |
635 | * Often, there are two cardbus bridges | |
636 | * -- try to leave one valid bus number | |
637 | * for each one. | |
638 | */ | |
639 | i /= 2; | |
640 | break; | |
641 | } | |
642 | } | |
cc57450f | 643 | max += i; |
26f674ae | 644 | pci_fixup_parent_subordinate_busnr(child, max); |
1da177e4 LT |
645 | } |
646 | /* | |
647 | * Set the subordinate bus number to its real value. | |
648 | */ | |
649 | child->subordinate = max; | |
650 | pci_write_config_byte(dev, PCI_SUBORDINATE_BUS, max); | |
651 | } | |
652 | ||
1da177e4 LT |
653 | sprintf(child->name, (is_cardbus ? "PCI CardBus #%02x" : "PCI Bus #%02x"), child->number); |
654 | ||
d55bef51 | 655 | /* Has only triggered on CardBus, fixup is in yenta_socket */ |
49887941 DB |
656 | while (bus->parent) { |
657 | if ((child->subordinate > bus->subordinate) || | |
658 | (child->number > bus->subordinate) || | |
659 | (child->number < bus->number) || | |
660 | (child->subordinate < bus->number)) { | |
d55bef51 BK |
661 | pr_debug("PCI: Bus #%02x (-#%02x) is %s" |
662 | "hidden behind%s bridge #%02x (-#%02x)\n", | |
663 | child->number, child->subordinate, | |
664 | (bus->number > child->subordinate && | |
665 | bus->subordinate < child->number) ? | |
666 | "wholly " : " partially", | |
667 | bus->self->transparent ? " transparent" : " ", | |
668 | bus->number, bus->subordinate); | |
49887941 DB |
669 | } |
670 | bus = bus->parent; | |
671 | } | |
672 | ||
bbe8f9a3 RB |
673 | out: |
674 | pci_write_config_word(dev, PCI_BRIDGE_CONTROL, bctl); | |
675 | ||
1da177e4 LT |
676 | return max; |
677 | } | |
678 | ||
679 | /* | |
680 | * Read interrupt line and base address registers. | |
681 | * The architecture-dependent code can tweak these, of course. | |
682 | */ | |
683 | static void pci_read_irq(struct pci_dev *dev) | |
684 | { | |
685 | unsigned char irq; | |
686 | ||
687 | pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &irq); | |
ffeff788 | 688 | dev->pin = irq; |
1da177e4 LT |
689 | if (irq) |
690 | pci_read_config_byte(dev, PCI_INTERRUPT_LINE, &irq); | |
691 | dev->irq = irq; | |
692 | } | |
693 | ||
01abc2aa | 694 | #define LEGACY_IO_RESOURCE (IORESOURCE_IO | IORESOURCE_PCI_FIXED) |
76e6a1d6 | 695 | |
1da177e4 LT |
696 | /** |
697 | * pci_setup_device - fill in class and map information of a device | |
698 | * @dev: the device structure to fill | |
699 | * | |
700 | * Initialize the device structure with information about the device's | |
701 | * vendor,class,memory and IO-space addresses,IRQ lines etc. | |
702 | * Called at initialisation of the PCI subsystem and by CardBus services. | |
703 | * Returns 0 on success and -1 if unknown type of device (not normal, bridge | |
704 | * or CardBus). | |
705 | */ | |
706 | static int pci_setup_device(struct pci_dev * dev) | |
707 | { | |
708 | u32 class; | |
709 | ||
710 | sprintf(pci_name(dev), "%04x:%02x:%02x.%d", pci_domain_nr(dev->bus), | |
711 | dev->bus->number, PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn)); | |
712 | ||
713 | pci_read_config_dword(dev, PCI_CLASS_REVISION, &class); | |
b8a3a521 | 714 | dev->revision = class & 0xff; |
1da177e4 LT |
715 | class >>= 8; /* upper 3 bytes */ |
716 | dev->class = class; | |
717 | class >>= 8; | |
718 | ||
719 | pr_debug("PCI: Found %s [%04x/%04x] %06x %02x\n", pci_name(dev), | |
720 | dev->vendor, dev->device, class, dev->hdr_type); | |
721 | ||
722 | /* "Unknown power state" */ | |
3fe9d19f | 723 | dev->current_state = PCI_UNKNOWN; |
1da177e4 LT |
724 | |
725 | /* Early fixups, before probing the BARs */ | |
726 | pci_fixup_device(pci_fixup_early, dev); | |
727 | class = dev->class >> 8; | |
728 | ||
729 | switch (dev->hdr_type) { /* header type */ | |
730 | case PCI_HEADER_TYPE_NORMAL: /* standard header */ | |
731 | if (class == PCI_CLASS_BRIDGE_PCI) | |
732 | goto bad; | |
733 | pci_read_irq(dev); | |
734 | pci_read_bases(dev, 6, PCI_ROM_ADDRESS); | |
735 | pci_read_config_word(dev, PCI_SUBSYSTEM_VENDOR_ID, &dev->subsystem_vendor); | |
736 | pci_read_config_word(dev, PCI_SUBSYSTEM_ID, &dev->subsystem_device); | |
368c73d4 AC |
737 | |
738 | /* | |
739 | * Do the ugly legacy mode stuff here rather than broken chip | |
740 | * quirk code. Legacy mode ATA controllers have fixed | |
741 | * addresses. These are not always echoed in BAR0-3, and | |
742 | * BAR0-3 in a few cases contain junk! | |
743 | */ | |
744 | if (class == PCI_CLASS_STORAGE_IDE) { | |
745 | u8 progif; | |
fd6e7321 YY |
746 | struct pci_bus_region region; |
747 | ||
368c73d4 AC |
748 | pci_read_config_byte(dev, PCI_CLASS_PROG, &progif); |
749 | if ((progif & 1) == 0) { | |
fd6e7321 YY |
750 | struct resource resource = { |
751 | .start = 0x1F0, | |
752 | .end = 0x1F7, | |
753 | .flags = LEGACY_IO_RESOURCE, | |
754 | }; | |
755 | ||
756 | pcibios_resource_to_bus(dev, ®ion, &resource); | |
757 | dev->resource[0].start = region.start; | |
758 | dev->resource[0].end = region.end; | |
759 | dev->resource[0].flags = resource.flags; | |
760 | resource.start = 0x3F6; | |
761 | resource.end = 0x3F6; | |
762 | resource.flags = LEGACY_IO_RESOURCE; | |
763 | pcibios_resource_to_bus(dev, ®ion, &resource); | |
764 | dev->resource[1].start = region.start; | |
765 | dev->resource[1].end = region.end; | |
766 | dev->resource[1].flags = resource.flags; | |
368c73d4 AC |
767 | } |
768 | if ((progif & 4) == 0) { | |
fd6e7321 YY |
769 | struct resource resource = { |
770 | .start = 0x170, | |
771 | .end = 0x177, | |
772 | .flags = LEGACY_IO_RESOURCE, | |
773 | }; | |
774 | ||
775 | pcibios_resource_to_bus(dev, ®ion, &resource); | |
776 | dev->resource[2].start = region.start; | |
777 | dev->resource[2].end = region.end; | |
778 | dev->resource[2].flags = resource.flags; | |
779 | resource.start = 0x376; | |
780 | resource.end = 0x376; | |
781 | resource.flags = LEGACY_IO_RESOURCE; | |
782 | pcibios_resource_to_bus(dev, ®ion, &resource); | |
783 | dev->resource[3].start = region.start; | |
784 | dev->resource[3].end = region.end; | |
785 | dev->resource[3].flags = resource.flags; | |
368c73d4 AC |
786 | } |
787 | } | |
1da177e4 LT |
788 | break; |
789 | ||
790 | case PCI_HEADER_TYPE_BRIDGE: /* bridge header */ | |
791 | if (class != PCI_CLASS_BRIDGE_PCI) | |
792 | goto bad; | |
793 | /* The PCI-to-PCI bridge spec requires that subtractive | |
794 | decoding (i.e. transparent) bridge must have programming | |
795 | interface code of 0x01. */ | |
3efd273b | 796 | pci_read_irq(dev); |
1da177e4 LT |
797 | dev->transparent = ((dev->class & 0xff) == 1); |
798 | pci_read_bases(dev, 2, PCI_ROM_ADDRESS1); | |
799 | break; | |
800 | ||
801 | case PCI_HEADER_TYPE_CARDBUS: /* CardBus bridge header */ | |
802 | if (class != PCI_CLASS_BRIDGE_CARDBUS) | |
803 | goto bad; | |
804 | pci_read_irq(dev); | |
805 | pci_read_bases(dev, 1, 0); | |
806 | pci_read_config_word(dev, PCI_CB_SUBSYSTEM_VENDOR_ID, &dev->subsystem_vendor); | |
807 | pci_read_config_word(dev, PCI_CB_SUBSYSTEM_ID, &dev->subsystem_device); | |
808 | break; | |
809 | ||
810 | default: /* unknown header */ | |
811 | printk(KERN_ERR "PCI: device %s has unknown header type %02x, ignoring.\n", | |
812 | pci_name(dev), dev->hdr_type); | |
813 | return -1; | |
814 | ||
815 | bad: | |
816 | printk(KERN_ERR "PCI: %s: class %x doesn't match header type %02x. Ignoring class.\n", | |
817 | pci_name(dev), class, dev->hdr_type); | |
818 | dev->class = PCI_CLASS_NOT_DEFINED; | |
819 | } | |
820 | ||
821 | /* We found a fine healthy device, go go go... */ | |
822 | return 0; | |
823 | } | |
824 | ||
825 | /** | |
826 | * pci_release_dev - free a pci device structure when all users of it are finished. | |
827 | * @dev: device that's been disconnected | |
828 | * | |
829 | * Will be called only by the device core when all users of this pci device are | |
830 | * done. | |
831 | */ | |
832 | static void pci_release_dev(struct device *dev) | |
833 | { | |
834 | struct pci_dev *pci_dev; | |
835 | ||
836 | pci_dev = to_pci_dev(dev); | |
837 | kfree(pci_dev); | |
838 | } | |
839 | ||
994a65e2 KA |
840 | static void set_pcie_port_type(struct pci_dev *pdev) |
841 | { | |
842 | int pos; | |
843 | u16 reg16; | |
844 | ||
845 | pos = pci_find_capability(pdev, PCI_CAP_ID_EXP); | |
846 | if (!pos) | |
847 | return; | |
848 | pdev->is_pcie = 1; | |
849 | pci_read_config_word(pdev, pos + PCI_EXP_FLAGS, ®16); | |
850 | pdev->pcie_type = (reg16 & PCI_EXP_FLAGS_TYPE) >> 4; | |
851 | } | |
852 | ||
1da177e4 LT |
853 | /** |
854 | * pci_cfg_space_size - get the configuration space size of the PCI device. | |
8f7020d3 | 855 | * @dev: PCI device |
1da177e4 LT |
856 | * |
857 | * Regular PCI devices have 256 bytes, but PCI-X 2 and PCI Express devices | |
858 | * have 4096 bytes. Even if the device is capable, that doesn't mean we can | |
859 | * access it. Maybe we don't have a way to generate extended config space | |
860 | * accesses, or the device is behind a reverse Express bridge. So we try | |
861 | * reading the dword at 0x100 which must either be 0 or a valid extended | |
862 | * capability header. | |
863 | */ | |
ac7dc65a | 864 | int pci_cfg_space_size(struct pci_dev *dev) |
1da177e4 LT |
865 | { |
866 | int pos; | |
867 | u32 status; | |
868 | ||
869 | pos = pci_find_capability(dev, PCI_CAP_ID_EXP); | |
870 | if (!pos) { | |
871 | pos = pci_find_capability(dev, PCI_CAP_ID_PCIX); | |
872 | if (!pos) | |
873 | goto fail; | |
874 | ||
875 | pci_read_config_dword(dev, pos + PCI_X_STATUS, &status); | |
876 | if (!(status & (PCI_X_STATUS_266MHZ | PCI_X_STATUS_533MHZ))) | |
877 | goto fail; | |
878 | } | |
879 | ||
880 | if (pci_read_config_dword(dev, 256, &status) != PCIBIOS_SUCCESSFUL) | |
881 | goto fail; | |
882 | if (status == 0xffffffff) | |
883 | goto fail; | |
884 | ||
885 | return PCI_CFG_SPACE_EXP_SIZE; | |
886 | ||
887 | fail: | |
888 | return PCI_CFG_SPACE_SIZE; | |
889 | } | |
890 | ||
891 | static void pci_release_bus_bridge_dev(struct device *dev) | |
892 | { | |
893 | kfree(dev); | |
894 | } | |
895 | ||
65891215 ME |
896 | struct pci_dev *alloc_pci_dev(void) |
897 | { | |
898 | struct pci_dev *dev; | |
899 | ||
900 | dev = kzalloc(sizeof(struct pci_dev), GFP_KERNEL); | |
901 | if (!dev) | |
902 | return NULL; | |
903 | ||
904 | INIT_LIST_HEAD(&dev->global_list); | |
905 | INIT_LIST_HEAD(&dev->bus_list); | |
906 | ||
4aa9bc95 ME |
907 | pci_msi_init_pci_dev(dev); |
908 | ||
65891215 ME |
909 | return dev; |
910 | } | |
911 | EXPORT_SYMBOL(alloc_pci_dev); | |
912 | ||
1da177e4 LT |
913 | /* |
914 | * Read the config data for a PCI device, sanity-check it | |
915 | * and fill in the dev structure... | |
916 | */ | |
917 | static struct pci_dev * __devinit | |
918 | pci_scan_device(struct pci_bus *bus, int devfn) | |
919 | { | |
920 | struct pci_dev *dev; | |
921 | u32 l; | |
922 | u8 hdr_type; | |
923 | int delay = 1; | |
924 | ||
925 | if (pci_bus_read_config_dword(bus, devfn, PCI_VENDOR_ID, &l)) | |
926 | return NULL; | |
927 | ||
928 | /* some broken boards return 0 or ~0 if a slot is empty: */ | |
929 | if (l == 0xffffffff || l == 0x00000000 || | |
930 | l == 0x0000ffff || l == 0xffff0000) | |
931 | return NULL; | |
932 | ||
933 | /* Configuration request Retry Status */ | |
934 | while (l == 0xffff0001) { | |
935 | msleep(delay); | |
936 | delay *= 2; | |
937 | if (pci_bus_read_config_dword(bus, devfn, PCI_VENDOR_ID, &l)) | |
938 | return NULL; | |
939 | /* Card hasn't responded in 60 seconds? Must be stuck. */ | |
940 | if (delay > 60 * 1000) { | |
941 | printk(KERN_WARNING "Device %04x:%02x:%02x.%d not " | |
942 | "responding\n", pci_domain_nr(bus), | |
943 | bus->number, PCI_SLOT(devfn), | |
944 | PCI_FUNC(devfn)); | |
945 | return NULL; | |
946 | } | |
947 | } | |
948 | ||
949 | if (pci_bus_read_config_byte(bus, devfn, PCI_HEADER_TYPE, &hdr_type)) | |
950 | return NULL; | |
951 | ||
bab41e9b | 952 | dev = alloc_pci_dev(); |
1da177e4 LT |
953 | if (!dev) |
954 | return NULL; | |
955 | ||
1da177e4 LT |
956 | dev->bus = bus; |
957 | dev->sysdata = bus->sysdata; | |
958 | dev->dev.parent = bus->bridge; | |
959 | dev->dev.bus = &pci_bus_type; | |
960 | dev->devfn = devfn; | |
961 | dev->hdr_type = hdr_type & 0x7f; | |
962 | dev->multifunction = !!(hdr_type & 0x80); | |
963 | dev->vendor = l & 0xffff; | |
964 | dev->device = (l >> 16) & 0xffff; | |
965 | dev->cfg_size = pci_cfg_space_size(dev); | |
82081797 | 966 | dev->error_state = pci_channel_io_normal; |
994a65e2 | 967 | set_pcie_port_type(dev); |
1da177e4 LT |
968 | |
969 | /* Assume 32-bit PCI; let 64-bit PCI cards (which are far rarer) | |
970 | set this higher, assuming the system even supports it. */ | |
971 | dev->dma_mask = 0xffffffff; | |
972 | if (pci_setup_device(dev) < 0) { | |
973 | kfree(dev); | |
974 | return NULL; | |
975 | } | |
1da177e4 LT |
976 | |
977 | return dev; | |
978 | } | |
979 | ||
96bde06a | 980 | void pci_device_add(struct pci_dev *dev, struct pci_bus *bus) |
1da177e4 | 981 | { |
cdb9b9f7 PM |
982 | device_initialize(&dev->dev); |
983 | dev->dev.release = pci_release_dev; | |
984 | pci_dev_get(dev); | |
1da177e4 | 985 | |
87348136 | 986 | set_dev_node(&dev->dev, pcibus_to_node(bus)); |
cdb9b9f7 PM |
987 | dev->dev.dma_mask = &dev->dma_mask; |
988 | dev->dev.coherent_dma_mask = 0xffffffffull; | |
1da177e4 | 989 | |
1da177e4 LT |
990 | /* Fix up broken headers */ |
991 | pci_fixup_device(pci_fixup_header, dev); | |
992 | ||
993 | /* | |
994 | * Add the device to our list of discovered devices | |
995 | * and the bus list for fixup functions, etc. | |
996 | */ | |
997 | INIT_LIST_HEAD(&dev->global_list); | |
d71374da | 998 | down_write(&pci_bus_sem); |
1da177e4 | 999 | list_add_tail(&dev->bus_list, &bus->devices); |
d71374da | 1000 | up_write(&pci_bus_sem); |
cdb9b9f7 PM |
1001 | } |
1002 | ||
96bde06a | 1003 | struct pci_dev *pci_scan_single_device(struct pci_bus *bus, int devfn) |
cdb9b9f7 PM |
1004 | { |
1005 | struct pci_dev *dev; | |
1006 | ||
1007 | dev = pci_scan_device(bus, devfn); | |
1008 | if (!dev) | |
1009 | return NULL; | |
1010 | ||
1011 | pci_device_add(dev, bus); | |
1da177e4 LT |
1012 | |
1013 | return dev; | |
1014 | } | |
1015 | ||
1016 | /** | |
1017 | * pci_scan_slot - scan a PCI slot on a bus for devices. | |
1018 | * @bus: PCI bus to scan | |
1019 | * @devfn: slot number to scan (must have zero function.) | |
1020 | * | |
1021 | * Scan a PCI slot on the specified PCI bus for devices, adding | |
1022 | * discovered devices to the @bus->devices list. New devices | |
1023 | * will have an empty dev->global_list head. | |
1024 | */ | |
96bde06a | 1025 | int pci_scan_slot(struct pci_bus *bus, int devfn) |
1da177e4 LT |
1026 | { |
1027 | int func, nr = 0; | |
1028 | int scan_all_fns; | |
1029 | ||
1030 | scan_all_fns = pcibios_scan_all_fns(bus, devfn); | |
1031 | ||
1032 | for (func = 0; func < 8; func++, devfn++) { | |
1033 | struct pci_dev *dev; | |
1034 | ||
1035 | dev = pci_scan_single_device(bus, devfn); | |
1036 | if (dev) { | |
1037 | nr++; | |
1038 | ||
1039 | /* | |
1040 | * If this is a single function device, | |
1041 | * don't scan past the first function. | |
1042 | */ | |
1043 | if (!dev->multifunction) { | |
1044 | if (func > 0) { | |
1045 | dev->multifunction = 1; | |
1046 | } else { | |
1047 | break; | |
1048 | } | |
1049 | } | |
1050 | } else { | |
1051 | if (func == 0 && !scan_all_fns) | |
1052 | break; | |
1053 | } | |
1054 | } | |
1055 | return nr; | |
1056 | } | |
1057 | ||
96bde06a | 1058 | unsigned int pci_scan_child_bus(struct pci_bus *bus) |
1da177e4 LT |
1059 | { |
1060 | unsigned int devfn, pass, max = bus->secondary; | |
1061 | struct pci_dev *dev; | |
1062 | ||
1063 | pr_debug("PCI: Scanning bus %04x:%02x\n", pci_domain_nr(bus), bus->number); | |
1064 | ||
1065 | /* Go find them, Rover! */ | |
1066 | for (devfn = 0; devfn < 0x100; devfn += 8) | |
1067 | pci_scan_slot(bus, devfn); | |
1068 | ||
1069 | /* | |
1070 | * After performing arch-dependent fixup of the bus, look behind | |
1071 | * all PCI-to-PCI bridges on this bus. | |
1072 | */ | |
1073 | pr_debug("PCI: Fixups for bus %04x:%02x\n", pci_domain_nr(bus), bus->number); | |
1074 | pcibios_fixup_bus(bus); | |
1075 | for (pass=0; pass < 2; pass++) | |
1076 | list_for_each_entry(dev, &bus->devices, bus_list) { | |
1077 | if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE || | |
1078 | dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) | |
1079 | max = pci_scan_bridge(bus, dev, max, pass); | |
1080 | } | |
1081 | ||
1082 | /* | |
1083 | * We've scanned the bus and so we know all about what's on | |
1084 | * the other side of any bridges that may be on this bus plus | |
1085 | * any devices. | |
1086 | * | |
1087 | * Return how far we've got finding sub-buses. | |
1088 | */ | |
1089 | pr_debug("PCI: Bus scan for %04x:%02x returning with max=%02x\n", | |
1090 | pci_domain_nr(bus), bus->number, max); | |
1091 | return max; | |
1092 | } | |
1093 | ||
1094 | unsigned int __devinit pci_do_scan_bus(struct pci_bus *bus) | |
1095 | { | |
1096 | unsigned int max; | |
1097 | ||
1098 | max = pci_scan_child_bus(bus); | |
1099 | ||
1100 | /* | |
1101 | * Make the discovered devices available. | |
1102 | */ | |
1103 | pci_bus_add_devices(bus); | |
1104 | ||
1105 | return max; | |
1106 | } | |
1107 | ||
96bde06a | 1108 | struct pci_bus * pci_create_bus(struct device *parent, |
cdb9b9f7 | 1109 | int bus, struct pci_ops *ops, void *sysdata) |
1da177e4 LT |
1110 | { |
1111 | int error; | |
1112 | struct pci_bus *b; | |
1113 | struct device *dev; | |
1114 | ||
1115 | b = pci_alloc_bus(); | |
1116 | if (!b) | |
1117 | return NULL; | |
1118 | ||
1119 | dev = kmalloc(sizeof(*dev), GFP_KERNEL); | |
1120 | if (!dev){ | |
1121 | kfree(b); | |
1122 | return NULL; | |
1123 | } | |
1124 | ||
1125 | b->sysdata = sysdata; | |
1126 | b->ops = ops; | |
1127 | ||
1128 | if (pci_find_bus(pci_domain_nr(b), bus)) { | |
1129 | /* If we already got to this bus through a different bridge, ignore it */ | |
1130 | pr_debug("PCI: Bus %04x:%02x already known\n", pci_domain_nr(b), bus); | |
1131 | goto err_out; | |
1132 | } | |
d71374da ZY |
1133 | |
1134 | down_write(&pci_bus_sem); | |
1da177e4 | 1135 | list_add_tail(&b->node, &pci_root_buses); |
d71374da | 1136 | up_write(&pci_bus_sem); |
1da177e4 LT |
1137 | |
1138 | memset(dev, 0, sizeof(*dev)); | |
1139 | dev->parent = parent; | |
1140 | dev->release = pci_release_bus_bridge_dev; | |
1141 | sprintf(dev->bus_id, "pci%04x:%02x", pci_domain_nr(b), bus); | |
1142 | error = device_register(dev); | |
1143 | if (error) | |
1144 | goto dev_reg_err; | |
1145 | b->bridge = get_device(dev); | |
1146 | ||
1147 | b->class_dev.class = &pcibus_class; | |
1148 | sprintf(b->class_dev.class_id, "%04x:%02x", pci_domain_nr(b), bus); | |
1149 | error = class_device_register(&b->class_dev); | |
1150 | if (error) | |
1151 | goto class_dev_reg_err; | |
1152 | error = class_device_create_file(&b->class_dev, &class_device_attr_cpuaffinity); | |
1153 | if (error) | |
1154 | goto class_dev_create_file_err; | |
1155 | ||
1156 | /* Create legacy_io and legacy_mem files for this bus */ | |
1157 | pci_create_legacy_files(b); | |
1158 | ||
1159 | error = sysfs_create_link(&b->class_dev.kobj, &b->bridge->kobj, "bridge"); | |
1160 | if (error) | |
1161 | goto sys_create_link_err; | |
1162 | ||
1163 | b->number = b->secondary = bus; | |
1164 | b->resource[0] = &ioport_resource; | |
1165 | b->resource[1] = &iomem_resource; | |
1166 | ||
1da177e4 LT |
1167 | return b; |
1168 | ||
1169 | sys_create_link_err: | |
1170 | class_device_remove_file(&b->class_dev, &class_device_attr_cpuaffinity); | |
1171 | class_dev_create_file_err: | |
1172 | class_device_unregister(&b->class_dev); | |
1173 | class_dev_reg_err: | |
1174 | device_unregister(dev); | |
1175 | dev_reg_err: | |
d71374da | 1176 | down_write(&pci_bus_sem); |
1da177e4 | 1177 | list_del(&b->node); |
d71374da | 1178 | up_write(&pci_bus_sem); |
1da177e4 LT |
1179 | err_out: |
1180 | kfree(dev); | |
1181 | kfree(b); | |
1182 | return NULL; | |
1183 | } | |
cdb9b9f7 PM |
1184 | EXPORT_SYMBOL_GPL(pci_create_bus); |
1185 | ||
96bde06a | 1186 | struct pci_bus *pci_scan_bus_parented(struct device *parent, |
cdb9b9f7 PM |
1187 | int bus, struct pci_ops *ops, void *sysdata) |
1188 | { | |
1189 | struct pci_bus *b; | |
1190 | ||
1191 | b = pci_create_bus(parent, bus, ops, sysdata); | |
1192 | if (b) | |
1193 | b->subordinate = pci_scan_child_bus(b); | |
1194 | return b; | |
1195 | } | |
1da177e4 LT |
1196 | EXPORT_SYMBOL(pci_scan_bus_parented); |
1197 | ||
1198 | #ifdef CONFIG_HOTPLUG | |
1199 | EXPORT_SYMBOL(pci_add_new_bus); | |
1200 | EXPORT_SYMBOL(pci_do_scan_bus); | |
1201 | EXPORT_SYMBOL(pci_scan_slot); | |
1202 | EXPORT_SYMBOL(pci_scan_bridge); | |
1203 | EXPORT_SYMBOL(pci_scan_single_device); | |
1204 | EXPORT_SYMBOL_GPL(pci_scan_child_bus); | |
1205 | #endif | |
6b4b78fe MD |
1206 | |
1207 | static int __init pci_sort_bf_cmp(const struct pci_dev *a, const struct pci_dev *b) | |
1208 | { | |
1209 | if (pci_domain_nr(a->bus) < pci_domain_nr(b->bus)) return -1; | |
1210 | else if (pci_domain_nr(a->bus) > pci_domain_nr(b->bus)) return 1; | |
1211 | ||
1212 | if (a->bus->number < b->bus->number) return -1; | |
1213 | else if (a->bus->number > b->bus->number) return 1; | |
1214 | ||
1215 | if (a->devfn < b->devfn) return -1; | |
1216 | else if (a->devfn > b->devfn) return 1; | |
1217 | ||
1218 | return 0; | |
1219 | } | |
1220 | ||
1221 | /* | |
1222 | * Yes, this forcably breaks the klist abstraction temporarily. It | |
1223 | * just wants to sort the klist, not change reference counts and | |
1224 | * take/drop locks rapidly in the process. It does all this while | |
1225 | * holding the lock for the list, so objects can't otherwise be | |
1226 | * added/removed while we're swizzling. | |
1227 | */ | |
1228 | static void __init pci_insertion_sort_klist(struct pci_dev *a, struct list_head *list) | |
1229 | { | |
1230 | struct list_head *pos; | |
1231 | struct klist_node *n; | |
1232 | struct device *dev; | |
1233 | struct pci_dev *b; | |
1234 | ||
1235 | list_for_each(pos, list) { | |
1236 | n = container_of(pos, struct klist_node, n_node); | |
1237 | dev = container_of(n, struct device, knode_bus); | |
1238 | b = to_pci_dev(dev); | |
1239 | if (pci_sort_bf_cmp(a, b) <= 0) { | |
1240 | list_move_tail(&a->dev.knode_bus.n_node, &b->dev.knode_bus.n_node); | |
1241 | return; | |
1242 | } | |
1243 | } | |
1244 | list_move_tail(&a->dev.knode_bus.n_node, list); | |
1245 | } | |
1246 | ||
1247 | static void __init pci_sort_breadthfirst_klist(void) | |
1248 | { | |
1249 | LIST_HEAD(sorted_devices); | |
1250 | struct list_head *pos, *tmp; | |
1251 | struct klist_node *n; | |
1252 | struct device *dev; | |
1253 | struct pci_dev *pdev; | |
1254 | ||
1255 | spin_lock(&pci_bus_type.klist_devices.k_lock); | |
1256 | list_for_each_safe(pos, tmp, &pci_bus_type.klist_devices.k_list) { | |
1257 | n = container_of(pos, struct klist_node, n_node); | |
1258 | dev = container_of(n, struct device, knode_bus); | |
1259 | pdev = to_pci_dev(dev); | |
1260 | pci_insertion_sort_klist(pdev, &sorted_devices); | |
1261 | } | |
1262 | list_splice(&sorted_devices, &pci_bus_type.klist_devices.k_list); | |
1263 | spin_unlock(&pci_bus_type.klist_devices.k_lock); | |
1264 | } | |
1265 | ||
1266 | static void __init pci_insertion_sort_devices(struct pci_dev *a, struct list_head *list) | |
1267 | { | |
1268 | struct pci_dev *b; | |
1269 | ||
1270 | list_for_each_entry(b, list, global_list) { | |
1271 | if (pci_sort_bf_cmp(a, b) <= 0) { | |
1272 | list_move_tail(&a->global_list, &b->global_list); | |
1273 | return; | |
1274 | } | |
1275 | } | |
1276 | list_move_tail(&a->global_list, list); | |
1277 | } | |
1278 | ||
1279 | static void __init pci_sort_breadthfirst_devices(void) | |
1280 | { | |
1281 | LIST_HEAD(sorted_devices); | |
1282 | struct pci_dev *dev, *tmp; | |
1283 | ||
1284 | down_write(&pci_bus_sem); | |
1285 | list_for_each_entry_safe(dev, tmp, &pci_devices, global_list) { | |
1286 | pci_insertion_sort_devices(dev, &sorted_devices); | |
1287 | } | |
1288 | list_splice(&sorted_devices, &pci_devices); | |
1289 | up_write(&pci_bus_sem); | |
1290 | } | |
1291 | ||
1292 | void __init pci_sort_breadthfirst(void) | |
1293 | { | |
1294 | pci_sort_breadthfirst_devices(); | |
1295 | pci_sort_breadthfirst_klist(); | |
1296 | } | |
1297 |