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Merge branch 'for-jens' of git://git.drbd.org/linux-2.6-drbd into for-2.6.33
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / pci / probe.c
blob8105e32117f67d8ce60317fb9a4151b305773434
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 Devices
47 */
48 static ssize_t pci_bus_show_cpuaffinity(struct device *dev,
49 int type,
50 struct device_attribute *attr,
51 char *buf)
52 {
53 int ret;
54 const struct cpumask *cpumask;
55
56 cpumask = cpumask_of_pcibus(to_pci_bus(dev));
57 ret = type?
58 cpulist_scnprintf(buf, PAGE_SIZE-2, cpumask) :
59 cpumask_scnprintf(buf, PAGE_SIZE-2, cpumask);
60 buf[ret++] = '\n';
61 buf[ret] = '\0';
62 return ret;
63 }
64
65 static ssize_t inline pci_bus_show_cpumaskaffinity(struct device *dev,
66 struct device_attribute *attr,
67 char *buf)
68 {
69 return pci_bus_show_cpuaffinity(dev, 0, attr, buf);
70 }
71
72 static ssize_t inline pci_bus_show_cpulistaffinity(struct device *dev,
73 struct device_attribute *attr,
74 char *buf)
75 {
76 return pci_bus_show_cpuaffinity(dev, 1, attr, buf);
77 }
78
79 DEVICE_ATTR(cpuaffinity, S_IRUGO, pci_bus_show_cpumaskaffinity, NULL);
80 DEVICE_ATTR(cpulistaffinity, S_IRUGO, pci_bus_show_cpulistaffinity, NULL);
81
82 /*
83 * PCI Bus Class
84 */
85 static void release_pcibus_dev(struct device *dev)
86 {
87 struct pci_bus *pci_bus = to_pci_bus(dev);
88
89 if (pci_bus->bridge)
90 put_device(pci_bus->bridge);
91 kfree(pci_bus);
92 }
93
94 static struct class pcibus_class = {
95 .name = "pci_bus",
96 .dev_release = &release_pcibus_dev,
97 };
98
99 static int __init pcibus_class_init(void)
100 {
101 return class_register(&pcibus_class);
102 }
103 postcore_initcall(pcibus_class_init);
104
105 /*
106 * Translate the low bits of the PCI base
107 * to the resource type
108 */
109 static inline unsigned int pci_calc_resource_flags(unsigned int flags)
110 {
111 if (flags & PCI_BASE_ADDRESS_SPACE_IO)
112 return IORESOURCE_IO;
113
114 if (flags & PCI_BASE_ADDRESS_MEM_PREFETCH)
115 return IORESOURCE_MEM | IORESOURCE_PREFETCH;
116
117 return IORESOURCE_MEM;
118 }
119
120 static u64 pci_size(u64 base, u64 maxbase, u64 mask)
121 {
122 u64 size = mask & maxbase; /* Find the significant bits */
123 if (!size)
124 return 0;
125
126 /* Get the lowest of them to find the decode size, and
127 from that the extent. */
128 size = (size & ~(size-1)) - 1;
129
130 /* base == maxbase can be valid only if the BAR has
131 already been programmed with all 1s. */
132 if (base == maxbase && ((base | size) & mask) != mask)
133 return 0;
134
135 return size;
136 }
137
138 static inline enum pci_bar_type decode_bar(struct resource *res, u32 bar)
139 {
140 if ((bar & PCI_BASE_ADDRESS_SPACE) == PCI_BASE_ADDRESS_SPACE_IO) {
141 res->flags = bar & ~PCI_BASE_ADDRESS_IO_MASK;
142 return pci_bar_io;
143 }
144
145 res->flags = bar & ~PCI_BASE_ADDRESS_MEM_MASK;
146
147 if (res->flags & PCI_BASE_ADDRESS_MEM_TYPE_64)
148 return pci_bar_mem64;
149 return pci_bar_mem32;
150 }
151
152 /**
153 * pci_read_base - read a PCI BAR
154 * @dev: the PCI device
155 * @type: type of the BAR
156 * @res: resource buffer to be filled in
157 * @pos: BAR position in the config space
158 *
159 * Returns 1 if the BAR is 64-bit, or 0 if 32-bit.
160 */
161 int __pci_read_base(struct pci_dev *dev, enum pci_bar_type type,
162 struct resource *res, unsigned int pos)
163 {
164 u32 l, sz, mask;
165
166 mask = type ? ~PCI_ROM_ADDRESS_ENABLE : ~0;
167
168 res->name = pci_name(dev);
169
170 pci_read_config_dword(dev, pos, &l);
171 pci_write_config_dword(dev, pos, mask);
172 pci_read_config_dword(dev, pos, &sz);
173 pci_write_config_dword(dev, pos, l);
174
175 /*
176 * All bits set in sz means the device isn't working properly.
177 * If the BAR isn't implemented, all bits must be 0. If it's a
178 * memory BAR or a ROM, bit 0 must be clear; if it's an io BAR, bit
179 * 1 must be clear.
180 */
181 if (!sz || sz == 0xffffffff)
182 goto fail;
183
184 /*
185 * I don't know how l can have all bits set. Copied from old code.
186 * Maybe it fixes a bug on some ancient platform.
187 */
188 if (l == 0xffffffff)
189 l = 0;
190
191 if (type == pci_bar_unknown) {
192 type = decode_bar(res, l);
193 res->flags |= pci_calc_resource_flags(l) | IORESOURCE_SIZEALIGN;
194 if (type == pci_bar_io) {
195 l &= PCI_BASE_ADDRESS_IO_MASK;
196 mask = PCI_BASE_ADDRESS_IO_MASK & IO_SPACE_LIMIT;
197 } else {
198 l &= PCI_BASE_ADDRESS_MEM_MASK;
199 mask = (u32)PCI_BASE_ADDRESS_MEM_MASK;
200 }
201 } else {
202 res->flags |= (l & IORESOURCE_ROM_ENABLE);
203 l &= PCI_ROM_ADDRESS_MASK;
204 mask = (u32)PCI_ROM_ADDRESS_MASK;
205 }
206
207 if (type == pci_bar_mem64) {
208 u64 l64 = l;
209 u64 sz64 = sz;
210 u64 mask64 = mask | (u64)~0 << 32;
211
212 pci_read_config_dword(dev, pos + 4, &l);
213 pci_write_config_dword(dev, pos + 4, ~0);
214 pci_read_config_dword(dev, pos + 4, &sz);
215 pci_write_config_dword(dev, pos + 4, l);
216
217 l64 |= ((u64)l << 32);
218 sz64 |= ((u64)sz << 32);
219
220 sz64 = pci_size(l64, sz64, mask64);
221
222 if (!sz64)
223 goto fail;
224
225 if ((sizeof(resource_size_t) < 8) && (sz64 > 0x100000000ULL)) {
226 dev_err(&dev->dev, "can't handle 64-bit BAR\n");
227 goto fail;
228 } else if ((sizeof(resource_size_t) < 8) && l) {
229 /* Address above 32-bit boundary; disable the BAR */
230 pci_write_config_dword(dev, pos, 0);
231 pci_write_config_dword(dev, pos + 4, 0);
232 res->start = 0;
233 res->end = sz64;
234 } else {
235 res->start = l64;
236 res->end = l64 + sz64;
237 dev_printk(KERN_DEBUG, &dev->dev,
238 "reg %x %s: %pR\n", pos,
239 (res->flags & IORESOURCE_PREFETCH) ?
240 "64bit mmio pref" : "64bit mmio",
241 res);
242 }
243
244 res->flags |= IORESOURCE_MEM_64;
245 } else {
246 sz = pci_size(l, sz, mask);
247
248 if (!sz)
249 goto fail;
250
251 res->start = l;
252 res->end = l + sz;
253
254 dev_printk(KERN_DEBUG, &dev->dev, "reg %x %s: %pR\n", pos,
255 (res->flags & IORESOURCE_IO) ? "io port" :
256 ((res->flags & IORESOURCE_PREFETCH) ?
257 "32bit mmio pref" : "32bit mmio"),
258 res);
259 }
260
261 out:
262 return (type == pci_bar_mem64) ? 1 : 0;
263 fail:
264 res->flags = 0;
265 goto out;
266 }
267
268 static void pci_read_bases(struct pci_dev *dev, unsigned int howmany, int rom)
269 {
270 unsigned int pos, reg;
271
272 for (pos = 0; pos < howmany; pos++) {
273 struct resource *res = &dev->resource[pos];
274 reg = PCI_BASE_ADDRESS_0 + (pos << 2);
275 pos += __pci_read_base(dev, pci_bar_unknown, res, reg);
276 }
277
278 if (rom) {
279 struct resource *res = &dev->resource[PCI_ROM_RESOURCE];
280 dev->rom_base_reg = rom;
281 res->flags = IORESOURCE_MEM | IORESOURCE_PREFETCH |
282 IORESOURCE_READONLY | IORESOURCE_CACHEABLE |
283 IORESOURCE_SIZEALIGN;
284 __pci_read_base(dev, pci_bar_mem32, res, rom);
285 }
286 }
287
288 void __devinit pci_read_bridge_bases(struct pci_bus *child)
289 {
290 struct pci_dev *dev = child->self;
291 u8 io_base_lo, io_limit_lo;
292 u16 mem_base_lo, mem_limit_lo;
293 unsigned long base, limit;
294 struct resource *res;
295 int i;
296
297 if (pci_is_root_bus(child)) /* It's a host bus, nothing to read */
298 return;
299
300 if (dev->transparent) {
301 dev_info(&dev->dev, "transparent bridge\n");
302 for(i = 3; i < PCI_BUS_NUM_RESOURCES; i++)
303 child->resource[i] = child->parent->resource[i - 3];
304 }
305
306 res = child->resource[0];
307 pci_read_config_byte(dev, PCI_IO_BASE, &io_base_lo);
308 pci_read_config_byte(dev, PCI_IO_LIMIT, &io_limit_lo);
309 base = (io_base_lo & PCI_IO_RANGE_MASK) << 8;
310 limit = (io_limit_lo & PCI_IO_RANGE_MASK) << 8;
311
312 if ((io_base_lo & PCI_IO_RANGE_TYPE_MASK) == PCI_IO_RANGE_TYPE_32) {
313 u16 io_base_hi, io_limit_hi;
314 pci_read_config_word(dev, PCI_IO_BASE_UPPER16, &io_base_hi);
315 pci_read_config_word(dev, PCI_IO_LIMIT_UPPER16, &io_limit_hi);
316 base |= (io_base_hi << 16);
317 limit |= (io_limit_hi << 16);
318 }
319
320 if (base <= limit) {
321 res->flags = (io_base_lo & PCI_IO_RANGE_TYPE_MASK) | IORESOURCE_IO;
322 if (!res->start)
323 res->start = base;
324 if (!res->end)
325 res->end = limit + 0xfff;
326 dev_printk(KERN_DEBUG, &dev->dev, "bridge io port: %pR\n", res);
327 }
328
329 res = child->resource[1];
330 pci_read_config_word(dev, PCI_MEMORY_BASE, &mem_base_lo);
331 pci_read_config_word(dev, PCI_MEMORY_LIMIT, &mem_limit_lo);
332 base = (mem_base_lo & PCI_MEMORY_RANGE_MASK) << 16;
333 limit = (mem_limit_lo & PCI_MEMORY_RANGE_MASK) << 16;
334 if (base <= limit) {
335 res->flags = (mem_base_lo & PCI_MEMORY_RANGE_TYPE_MASK) | IORESOURCE_MEM;
336 res->start = base;
337 res->end = limit + 0xfffff;
338 dev_printk(KERN_DEBUG, &dev->dev, "bridge 32bit mmio: %pR\n",
339 res);
340 }
341
342 res = child->resource[2];
343 pci_read_config_word(dev, PCI_PREF_MEMORY_BASE, &mem_base_lo);
344 pci_read_config_word(dev, PCI_PREF_MEMORY_LIMIT, &mem_limit_lo);
345 base = (mem_base_lo & PCI_PREF_RANGE_MASK) << 16;
346 limit = (mem_limit_lo & PCI_PREF_RANGE_MASK) << 16;
347
348 if ((mem_base_lo & PCI_PREF_RANGE_TYPE_MASK) == PCI_PREF_RANGE_TYPE_64) {
349 u32 mem_base_hi, mem_limit_hi;
350 pci_read_config_dword(dev, PCI_PREF_BASE_UPPER32, &mem_base_hi);
351 pci_read_config_dword(dev, PCI_PREF_LIMIT_UPPER32, &mem_limit_hi);
352
353 /*
354 * Some bridges set the base > limit by default, and some
355 * (broken) BIOSes do not initialize them. If we find
356 * this, just assume they are not being used.
357 */
358 if (mem_base_hi <= mem_limit_hi) {
359 #if BITS_PER_LONG == 64
360 base |= ((long) mem_base_hi) << 32;
361 limit |= ((long) mem_limit_hi) << 32;
362 #else
363 if (mem_base_hi || mem_limit_hi) {
364 dev_err(&dev->dev, "can't handle 64-bit "
365 "address space for bridge\n");
366 return;
367 }
368 #endif
369 }
370 }
371 if (base <= limit) {
372 res->flags = (mem_base_lo & PCI_PREF_RANGE_TYPE_MASK) |
373 IORESOURCE_MEM | IORESOURCE_PREFETCH;
374 if (res->flags & PCI_PREF_RANGE_TYPE_64)
375 res->flags |= IORESOURCE_MEM_64;
376 res->start = base;
377 res->end = limit + 0xfffff;
378 dev_printk(KERN_DEBUG, &dev->dev, "bridge %sbit mmio pref: %pR\n",
379 (res->flags & PCI_PREF_RANGE_TYPE_64) ? "64" : "32",
380 res);
381 }
382 }
383
384 static struct pci_bus * pci_alloc_bus(void)
385 {
386 struct pci_bus *b;
387
388 b = kzalloc(sizeof(*b), GFP_KERNEL);
389 if (b) {
390 INIT_LIST_HEAD(&b->node);
391 INIT_LIST_HEAD(&b->children);
392 INIT_LIST_HEAD(&b->devices);
393 INIT_LIST_HEAD(&b->slots);
394 }
395 return b;
396 }
397
398 static struct pci_bus *pci_alloc_child_bus(struct pci_bus *parent,
399 struct pci_dev *bridge, int busnr)
400 {
401 struct pci_bus *child;
402 int i;
403
404 /*
405 * Allocate a new bus, and inherit stuff from the parent..
406 */
407 child = pci_alloc_bus();
408 if (!child)
409 return NULL;
410
411 child->parent = parent;
412 child->ops = parent->ops;
413 child->sysdata = parent->sysdata;
414 child->bus_flags = parent->bus_flags;
415
416 /* initialize some portions of the bus device, but don't register it
417 * now as the parent is not properly set up yet. This device will get
418 * registered later in pci_bus_add_devices()
419 */
420 child->dev.class = &pcibus_class;
421 dev_set_name(&child->dev, "%04x:%02x", pci_domain_nr(child), busnr);
422
423 /*
424 * Set up the primary, secondary and subordinate
425 * bus numbers.
426 */
427 child->number = child->secondary = busnr;
428 child->primary = parent->secondary;
429 child->subordinate = 0xff;
430
431 if (!bridge)
432 return child;
433
434 child->self = bridge;
435 child->bridge = get_device(&bridge->dev);
436
437 /* Set up default resource pointers and names.. */
438 for (i = 0; i < PCI_BRIDGE_RESOURCE_NUM; i++) {
439 child->resource[i] = &bridge->resource[PCI_BRIDGE_RESOURCES+i];
440 child->resource[i]->name = child->name;
441 }
442 bridge->subordinate = child;
443
444 return child;
445 }
446
447 struct pci_bus *__ref pci_add_new_bus(struct pci_bus *parent, struct pci_dev *dev, int busnr)
448 {
449 struct pci_bus *child;
450
451 child = pci_alloc_child_bus(parent, dev, busnr);
452 if (child) {
453 down_write(&pci_bus_sem);
454 list_add_tail(&child->node, &parent->children);
455 up_write(&pci_bus_sem);
456 }
457 return child;
458 }
459
460 static void pci_fixup_parent_subordinate_busnr(struct pci_bus *child, int max)
461 {
462 struct pci_bus *parent = child->parent;
463
464 /* Attempts to fix that up are really dangerous unless
465 we're going to re-assign all bus numbers. */
466 if (!pcibios_assign_all_busses())
467 return;
468
469 while (parent->parent && parent->subordinate < max) {
470 parent->subordinate = max;
471 pci_write_config_byte(parent->self, PCI_SUBORDINATE_BUS, max);
472 parent = parent->parent;
473 }
474 }
475
476 /*
477 * If it's a bridge, configure it and scan the bus behind it.
478 * For CardBus bridges, we don't scan behind as the devices will
479 * be handled by the bridge driver itself.
480 *
481 * We need to process bridges in two passes -- first we scan those
482 * already configured by the BIOS and after we are done with all of
483 * them, we proceed to assigning numbers to the remaining buses in
484 * order to avoid overlaps between old and new bus numbers.
485 */
486 int __devinit pci_scan_bridge(struct pci_bus *bus, struct pci_dev *dev, int max, int pass)
487 {
488 struct pci_bus *child;
489 int is_cardbus = (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS);
490 u32 buses, i, j = 0;
491 u16 bctl;
492 int broken = 0;
493
494 pci_read_config_dword(dev, PCI_PRIMARY_BUS, &buses);
495
496 dev_dbg(&dev->dev, "scanning behind bridge, config %06x, pass %d\n",
497 buses & 0xffffff, pass);
498
499 /* Check if setup is sensible at all */
500 if (!pass &&
501 ((buses & 0xff) != bus->number || ((buses >> 8) & 0xff) <= bus->number)) {
502 dev_dbg(&dev->dev, "bus configuration invalid, reconfiguring\n");
503 broken = 1;
504 }
505
506 /* Disable MasterAbortMode during probing to avoid reporting
507 of bus errors (in some architectures) */
508 pci_read_config_word(dev, PCI_BRIDGE_CONTROL, &bctl);
509 pci_write_config_word(dev, PCI_BRIDGE_CONTROL,
510 bctl & ~PCI_BRIDGE_CTL_MASTER_ABORT);
511
512 if ((buses & 0xffff00) && !pcibios_assign_all_busses() && !is_cardbus && !broken) {
513 unsigned int cmax, busnr;
514 /*
515 * Bus already configured by firmware, process it in the first
516 * pass and just note the configuration.
517 */
518 if (pass)
519 goto out;
520 busnr = (buses >> 8) & 0xFF;
521
522 /*
523 * If we already got to this bus through a different bridge,
524 * don't re-add it. This can happen with the i450NX chipset.
525 *
526 * However, we continue to descend down the hierarchy and
527 * scan remaining child buses.
528 */
529 child = pci_find_bus(pci_domain_nr(bus), busnr);
530 if (!child) {
531 child = pci_add_new_bus(bus, dev, busnr);
532 if (!child)
533 goto out;
534 child->primary = buses & 0xFF;
535 child->subordinate = (buses >> 16) & 0xFF;
536 child->bridge_ctl = bctl;
537 }
538
539 cmax = pci_scan_child_bus(child);
540 if (cmax > max)
541 max = cmax;
542 if (child->subordinate > max)
543 max = child->subordinate;
544 } else {
545 /*
546 * We need to assign a number to this bus which we always
547 * do in the second pass.
548 */
549 if (!pass) {
550 if (pcibios_assign_all_busses() || broken)
551 /* Temporarily disable forwarding of the
552 configuration cycles on all bridges in
553 this bus segment to avoid possible
554 conflicts in the second pass between two
555 bridges programmed with overlapping
556 bus ranges. */
557 pci_write_config_dword(dev, PCI_PRIMARY_BUS,
558 buses & ~0xffffff);
559 goto out;
560 }
561
562 /* Clear errors */
563 pci_write_config_word(dev, PCI_STATUS, 0xffff);
564
565 /* Prevent assigning a bus number that already exists.
566 * This can happen when a bridge is hot-plugged */
567 if (pci_find_bus(pci_domain_nr(bus), max+1))
568 goto out;
569 child = pci_add_new_bus(bus, dev, ++max);
570 buses = (buses & 0xff000000)
571 | ((unsigned int)(child->primary) << 0)
572 | ((unsigned int)(child->secondary) << 8)
573 | ((unsigned int)(child->subordinate) << 16);
574
575 /*
576 * yenta.c forces a secondary latency timer of 176.
577 * Copy that behaviour here.
578 */
579 if (is_cardbus) {
580 buses &= ~0xff000000;
581 buses |= CARDBUS_LATENCY_TIMER << 24;
582 }
583
584 /*
585 * We need to blast all three values with a single write.
586 */
587 pci_write_config_dword(dev, PCI_PRIMARY_BUS, buses);
588
589 if (!is_cardbus) {
590 child->bridge_ctl = bctl;
591 /*
592 * Adjust subordinate busnr in parent buses.
593 * We do this before scanning for children because
594 * some devices may not be detected if the bios
595 * was lazy.
596 */
597 pci_fixup_parent_subordinate_busnr(child, max);
598 /* Now we can scan all subordinate buses... */
599 max = pci_scan_child_bus(child);
600 /*
601 * now fix it up again since we have found
602 * the real value of max.
603 */
604 pci_fixup_parent_subordinate_busnr(child, max);
605 } else {
606 /*
607 * For CardBus bridges, we leave 4 bus numbers
608 * as cards with a PCI-to-PCI bridge can be
609 * inserted later.
610 */
611 for (i=0; i<CARDBUS_RESERVE_BUSNR; i++) {
612 struct pci_bus *parent = bus;
613 if (pci_find_bus(pci_domain_nr(bus),
614 max+i+1))
615 break;
616 while (parent->parent) {
617 if ((!pcibios_assign_all_busses()) &&
618 (parent->subordinate > max) &&
619 (parent->subordinate <= max+i)) {
620 j = 1;
621 }
622 parent = parent->parent;
623 }
624 if (j) {
625 /*
626 * Often, there are two cardbus bridges
627 * -- try to leave one valid bus number
628 * for each one.
629 */
630 i /= 2;
631 break;
632 }
633 }
634 max += i;
635 pci_fixup_parent_subordinate_busnr(child, max);
636 }
637 /*
638 * Set the subordinate bus number to its real value.
639 */
640 child->subordinate = max;
641 pci_write_config_byte(dev, PCI_SUBORDINATE_BUS, max);
642 }
643
644 sprintf(child->name,
645 (is_cardbus ? "PCI CardBus %04x:%02x" : "PCI Bus %04x:%02x"),
646 pci_domain_nr(bus), child->number);
647
648 /* Has only triggered on CardBus, fixup is in yenta_socket */
649 while (bus->parent) {
650 if ((child->subordinate > bus->subordinate) ||
651 (child->number > bus->subordinate) ||
652 (child->number < bus->number) ||
653 (child->subordinate < bus->number)) {
654 pr_debug("PCI: Bus #%02x (-#%02x) is %s "
655 "hidden behind%s bridge #%02x (-#%02x)\n",
656 child->number, child->subordinate,
657 (bus->number > child->subordinate &&
658 bus->subordinate < child->number) ?
659 "wholly" : "partially",
660 bus->self->transparent ? " transparent" : "",
661 bus->number, bus->subordinate);
662 }
663 bus = bus->parent;
664 }
665
666 out:
667 pci_write_config_word(dev, PCI_BRIDGE_CONTROL, bctl);
668
669 return max;
670 }
671
672 /*
673 * Read interrupt line and base address registers.
674 * The architecture-dependent code can tweak these, of course.
675 */
676 static void pci_read_irq(struct pci_dev *dev)
677 {
678 unsigned char irq;
679
680 pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &irq);
681 dev->pin = irq;
682 if (irq)
683 pci_read_config_byte(dev, PCI_INTERRUPT_LINE, &irq);
684 dev->irq = irq;
685 }
686
687 static void set_pcie_port_type(struct pci_dev *pdev)
688 {
689 int pos;
690 u16 reg16;
691
692 pos = pci_find_capability(pdev, PCI_CAP_ID_EXP);
693 if (!pos)
694 return;
695 pdev->is_pcie = 1;
696 pci_read_config_word(pdev, pos + PCI_EXP_FLAGS, &reg16);
697 pdev->pcie_type = (reg16 & PCI_EXP_FLAGS_TYPE) >> 4;
698 }
699
700 static void set_pcie_hotplug_bridge(struct pci_dev *pdev)
701 {
702 int pos;
703 u16 reg16;
704 u32 reg32;
705
706 pos = pci_find_capability(pdev, PCI_CAP_ID_EXP);
707 if (!pos)
708 return;
709 pci_read_config_word(pdev, pos + PCI_EXP_FLAGS, &reg16);
710 if (!(reg16 & PCI_EXP_FLAGS_SLOT))
711 return;
712 pci_read_config_dword(pdev, pos + PCI_EXP_SLTCAP, &reg32);
713 if (reg32 & PCI_EXP_SLTCAP_HPC)
714 pdev->is_hotplug_bridge = 1;
715 }
716
717 #define LEGACY_IO_RESOURCE (IORESOURCE_IO | IORESOURCE_PCI_FIXED)
718
719 /**
720 * pci_setup_device - fill in class and map information of a device
721 * @dev: the device structure to fill
722 *
723 * Initialize the device structure with information about the device's
724 * vendor,class,memory and IO-space addresses,IRQ lines etc.
725 * Called at initialisation of the PCI subsystem and by CardBus services.
726 * Returns 0 on success and negative if unknown type of device (not normal,
727 * bridge or CardBus).
728 */
729 int pci_setup_device(struct pci_dev *dev)
730 {
731 u32 class;
732 u8 hdr_type;
733 struct pci_slot *slot;
734
735 if (pci_read_config_byte(dev, PCI_HEADER_TYPE, &hdr_type))
736 return -EIO;
737
738 dev->sysdata = dev->bus->sysdata;
739 dev->dev.parent = dev->bus->bridge;
740 dev->dev.bus = &pci_bus_type;
741 dev->hdr_type = hdr_type & 0x7f;
742 dev->multifunction = !!(hdr_type & 0x80);
743 dev->error_state = pci_channel_io_normal;
744 set_pcie_port_type(dev);
745
746 list_for_each_entry(slot, &dev->bus->slots, list)
747 if (PCI_SLOT(dev->devfn) == slot->number)
748 dev->slot = slot;
749
750 /* Assume 32-bit PCI; let 64-bit PCI cards (which are far rarer)
751 set this higher, assuming the system even supports it. */
752 dev->dma_mask = 0xffffffff;
753
754 dev_set_name(&dev->dev, "%04x:%02x:%02x.%d", pci_domain_nr(dev->bus),
755 dev->bus->number, PCI_SLOT(dev->devfn),
756 PCI_FUNC(dev->devfn));
757
758 pci_read_config_dword(dev, PCI_CLASS_REVISION, &class);
759 dev->revision = class & 0xff;
760 class >>= 8; /* upper 3 bytes */
761 dev->class = class;
762 class >>= 8;
763
764 dev_dbg(&dev->dev, "found [%04x:%04x] class %06x header type %02x\n",
765 dev->vendor, dev->device, class, dev->hdr_type);
766
767 /* need to have dev->class ready */
768 dev->cfg_size = pci_cfg_space_size(dev);
769
770 /* "Unknown power state" */
771 dev->current_state = PCI_UNKNOWN;
772
773 /* Early fixups, before probing the BARs */
774 pci_fixup_device(pci_fixup_early, dev);
775 /* device class may be changed after fixup */
776 class = dev->class >> 8;
777
778 switch (dev->hdr_type) { /* header type */
779 case PCI_HEADER_TYPE_NORMAL: /* standard header */
780 if (class == PCI_CLASS_BRIDGE_PCI)
781 goto bad;
782 pci_read_irq(dev);
783 pci_read_bases(dev, 6, PCI_ROM_ADDRESS);
784 pci_read_config_word(dev, PCI_SUBSYSTEM_VENDOR_ID, &dev->subsystem_vendor);
785 pci_read_config_word(dev, PCI_SUBSYSTEM_ID, &dev->subsystem_device);
786
787 /*
788 * Do the ugly legacy mode stuff here rather than broken chip
789 * quirk code. Legacy mode ATA controllers have fixed
790 * addresses. These are not always echoed in BAR0-3, and
791 * BAR0-3 in a few cases contain junk!
792 */
793 if (class == PCI_CLASS_STORAGE_IDE) {
794 u8 progif;
795 pci_read_config_byte(dev, PCI_CLASS_PROG, &progif);
796 if ((progif & 1) == 0) {
797 dev->resource[0].start = 0x1F0;
798 dev->resource[0].end = 0x1F7;
799 dev->resource[0].flags = LEGACY_IO_RESOURCE;
800 dev->resource[1].start = 0x3F6;
801 dev->resource[1].end = 0x3F6;
802 dev->resource[1].flags = LEGACY_IO_RESOURCE;
803 }
804 if ((progif & 4) == 0) {
805 dev->resource[2].start = 0x170;
806 dev->resource[2].end = 0x177;
807 dev->resource[2].flags = LEGACY_IO_RESOURCE;
808 dev->resource[3].start = 0x376;
809 dev->resource[3].end = 0x376;
810 dev->resource[3].flags = LEGACY_IO_RESOURCE;
811 }
812 }
813 break;
814
815 case PCI_HEADER_TYPE_BRIDGE: /* bridge header */
816 if (class != PCI_CLASS_BRIDGE_PCI)
817 goto bad;
818 /* The PCI-to-PCI bridge spec requires that subtractive
819 decoding (i.e. transparent) bridge must have programming
820 interface code of 0x01. */
821 pci_read_irq(dev);
822 dev->transparent = ((dev->class & 0xff) == 1);
823 pci_read_bases(dev, 2, PCI_ROM_ADDRESS1);
824 set_pcie_hotplug_bridge(dev);
825 break;
826
827 case PCI_HEADER_TYPE_CARDBUS: /* CardBus bridge header */
828 if (class != PCI_CLASS_BRIDGE_CARDBUS)
829 goto bad;
830 pci_read_irq(dev);
831 pci_read_bases(dev, 1, 0);
832 pci_read_config_word(dev, PCI_CB_SUBSYSTEM_VENDOR_ID, &dev->subsystem_vendor);
833 pci_read_config_word(dev, PCI_CB_SUBSYSTEM_ID, &dev->subsystem_device);
834 break;
835
836 default: /* unknown header */
837 dev_err(&dev->dev, "unknown header type %02x, "
838 "ignoring device\n", dev->hdr_type);
839 return -EIO;
840
841 bad:
842 dev_err(&dev->dev, "ignoring class %02x (doesn't match header "
843 "type %02x)\n", class, dev->hdr_type);
844 dev->class = PCI_CLASS_NOT_DEFINED;
845 }
846
847 /* We found a fine healthy device, go go go... */
848 return 0;
849 }
850
851 static void pci_release_capabilities(struct pci_dev *dev)
852 {
853 pci_vpd_release(dev);
854 pci_iov_release(dev);
855 }
856
857 /**
858 * pci_release_dev - free a pci device structure when all users of it are finished.
859 * @dev: device that's been disconnected
860 *
861 * Will be called only by the device core when all users of this pci device are
862 * done.
863 */
864 static void pci_release_dev(struct device *dev)
865 {
866 struct pci_dev *pci_dev;
867
868 pci_dev = to_pci_dev(dev);
869 pci_release_capabilities(pci_dev);
870 kfree(pci_dev);
871 }
872
873 /**
874 * pci_cfg_space_size - get the configuration space size of the PCI device.
875 * @dev: PCI device
876 *
877 * Regular PCI devices have 256 bytes, but PCI-X 2 and PCI Express devices
878 * have 4096 bytes. Even if the device is capable, that doesn't mean we can
879 * access it. Maybe we don't have a way to generate extended config space
880 * accesses, or the device is behind a reverse Express bridge. So we try
881 * reading the dword at 0x100 which must either be 0 or a valid extended
882 * capability header.
883 */
884 int pci_cfg_space_size_ext(struct pci_dev *dev)
885 {
886 u32 status;
887 int pos = PCI_CFG_SPACE_SIZE;
888
889 if (pci_read_config_dword(dev, pos, &status) != PCIBIOS_SUCCESSFUL)
890 goto fail;
891 if (status == 0xffffffff)
892 goto fail;
893
894 return PCI_CFG_SPACE_EXP_SIZE;
895
896 fail:
897 return PCI_CFG_SPACE_SIZE;
898 }
899
900 int pci_cfg_space_size(struct pci_dev *dev)
901 {
902 int pos;
903 u32 status;
904 u16 class;
905
906 class = dev->class >> 8;
907 if (class == PCI_CLASS_BRIDGE_HOST)
908 return pci_cfg_space_size_ext(dev);
909
910 pos = pci_find_capability(dev, PCI_CAP_ID_EXP);
911 if (!pos) {
912 pos = pci_find_capability(dev, PCI_CAP_ID_PCIX);
913 if (!pos)
914 goto fail;
915
916 pci_read_config_dword(dev, pos + PCI_X_STATUS, &status);
917 if (!(status & (PCI_X_STATUS_266MHZ | PCI_X_STATUS_533MHZ)))
918 goto fail;
919 }
920
921 return pci_cfg_space_size_ext(dev);
922
923 fail:
924 return PCI_CFG_SPACE_SIZE;
925 }
926
927 static void pci_release_bus_bridge_dev(struct device *dev)
928 {
929 kfree(dev);
930 }
931
932 struct pci_dev *alloc_pci_dev(void)
933 {
934 struct pci_dev *dev;
935
936 dev = kzalloc(sizeof(struct pci_dev), GFP_KERNEL);
937 if (!dev)
938 return NULL;
939
940 INIT_LIST_HEAD(&dev->bus_list);
941
942 return dev;
943 }
944 EXPORT_SYMBOL(alloc_pci_dev);
945
946 /*
947 * Read the config data for a PCI device, sanity-check it
948 * and fill in the dev structure...
949 */
950 static struct pci_dev *pci_scan_device(struct pci_bus *bus, int devfn)
951 {
952 struct pci_dev *dev;
953 u32 l;
954 int delay = 1;
955
956 if (pci_bus_read_config_dword(bus, devfn, PCI_VENDOR_ID, &l))
957 return NULL;
958
959 /* some broken boards return 0 or ~0 if a slot is empty: */
960 if (l == 0xffffffff || l == 0x00000000 ||
961 l == 0x0000ffff || l == 0xffff0000)
962 return NULL;
963
964 /* Configuration request Retry Status */
965 while (l == 0xffff0001) {
966 msleep(delay);
967 delay *= 2;
968 if (pci_bus_read_config_dword(bus, devfn, PCI_VENDOR_ID, &l))
969 return NULL;
970 /* Card hasn't responded in 60 seconds? Must be stuck. */
971 if (delay > 60 * 1000) {
972 printk(KERN_WARNING "pci %04x:%02x:%02x.%d: not "
973 "responding\n", pci_domain_nr(bus),
974 bus->number, PCI_SLOT(devfn),
975 PCI_FUNC(devfn));
976 return NULL;
977 }
978 }
979
980 dev = alloc_pci_dev();
981 if (!dev)
982 return NULL;
983
984 dev->bus = bus;
985 dev->devfn = devfn;
986 dev->vendor = l & 0xffff;
987 dev->device = (l >> 16) & 0xffff;
988
989 if (pci_setup_device(dev)) {
990 kfree(dev);
991 return NULL;
992 }
993
994 return dev;
995 }
996
997 static void pci_init_capabilities(struct pci_dev *dev)
998 {
999 /* MSI/MSI-X list */
1000 pci_msi_init_pci_dev(dev);
1001
1002 /* Buffers for saving PCIe and PCI-X capabilities */
1003 pci_allocate_cap_save_buffers(dev);
1004
1005 /* Power Management */
1006 pci_pm_init(dev);
1007 platform_pci_wakeup_init(dev);
1008
1009 /* Vital Product Data */
1010 pci_vpd_pci22_init(dev);
1011
1012 /* Alternative Routing-ID Forwarding */
1013 pci_enable_ari(dev);
1014
1015 /* Single Root I/O Virtualization */
1016 pci_iov_init(dev);
1017 }
1018
1019 void pci_device_add(struct pci_dev *dev, struct pci_bus *bus)
1020 {
1021 device_initialize(&dev->dev);
1022 dev->dev.release = pci_release_dev;
1023 pci_dev_get(dev);
1024
1025 dev->dev.dma_mask = &dev->dma_mask;
1026 dev->dev.dma_parms = &dev->dma_parms;
1027 dev->dev.coherent_dma_mask = 0xffffffffull;
1028
1029 pci_set_dma_max_seg_size(dev, 65536);
1030 pci_set_dma_seg_boundary(dev, 0xffffffff);
1031
1032 /* Fix up broken headers */
1033 pci_fixup_device(pci_fixup_header, dev);
1034
1035 /* Clear the state_saved flag. */
1036 dev->state_saved = false;
1037
1038 /* Initialize various capabilities */
1039 pci_init_capabilities(dev);
1040
1041 /*
1042 * Add the device to our list of discovered devices
1043 * and the bus list for fixup functions, etc.
1044 */
1045 down_write(&pci_bus_sem);
1046 list_add_tail(&dev->bus_list, &bus->devices);
1047 up_write(&pci_bus_sem);
1048 }
1049
1050 struct pci_dev *__ref pci_scan_single_device(struct pci_bus *bus, int devfn)
1051 {
1052 struct pci_dev *dev;
1053
1054 dev = pci_get_slot(bus, devfn);
1055 if (dev) {
1056 pci_dev_put(dev);
1057 return dev;
1058 }
1059
1060 dev = pci_scan_device(bus, devfn);
1061 if (!dev)
1062 return NULL;
1063
1064 pci_device_add(dev, bus);
1065
1066 return dev;
1067 }
1068 EXPORT_SYMBOL(pci_scan_single_device);
1069
1070 /**
1071 * pci_scan_slot - scan a PCI slot on a bus for devices.
1072 * @bus: PCI bus to scan
1073 * @devfn: slot number to scan (must have zero function.)
1074 *
1075 * Scan a PCI slot on the specified PCI bus for devices, adding
1076 * discovered devices to the @bus->devices list. New devices
1077 * will not have is_added set.
1078 *
1079 * Returns the number of new devices found.
1080 */
1081 int pci_scan_slot(struct pci_bus *bus, int devfn)
1082 {
1083 int fn, nr = 0;
1084 struct pci_dev *dev;
1085
1086 dev = pci_scan_single_device(bus, devfn);
1087 if (dev && !dev->is_added) /* new device? */
1088 nr++;
1089
1090 if (dev && dev->multifunction) {
1091 for (fn = 1; fn < 8; fn++) {
1092 dev = pci_scan_single_device(bus, devfn + fn);
1093 if (dev) {
1094 if (!dev->is_added)
1095 nr++;
1096 dev->multifunction = 1;
1097 }
1098 }
1099 }
1100
1101 /* only one slot has pcie device */
1102 if (bus->self && nr)
1103 pcie_aspm_init_link_state(bus->self);
1104
1105 return nr;
1106 }
1107
1108 unsigned int __devinit pci_scan_child_bus(struct pci_bus *bus)
1109 {
1110 unsigned int devfn, pass, max = bus->secondary;
1111 struct pci_dev *dev;
1112
1113 pr_debug("PCI: Scanning bus %04x:%02x\n", pci_domain_nr(bus), bus->number);
1114
1115 /* Go find them, Rover! */
1116 for (devfn = 0; devfn < 0x100; devfn += 8)
1117 pci_scan_slot(bus, devfn);
1118
1119 /* Reserve buses for SR-IOV capability. */
1120 max += pci_iov_bus_range(bus);
1121
1122 /*
1123 * After performing arch-dependent fixup of the bus, look behind
1124 * all PCI-to-PCI bridges on this bus.
1125 */
1126 if (!bus->is_added) {
1127 pr_debug("PCI: Fixups for bus %04x:%02x\n",
1128 pci_domain_nr(bus), bus->number);
1129 pcibios_fixup_bus(bus);
1130 if (pci_is_root_bus(bus))
1131 bus->is_added = 1;
1132 }
1133
1134 for (pass=0; pass < 2; pass++)
1135 list_for_each_entry(dev, &bus->devices, bus_list) {
1136 if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE ||
1137 dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)
1138 max = pci_scan_bridge(bus, dev, max, pass);
1139 }
1140
1141 /*
1142 * We've scanned the bus and so we know all about what's on
1143 * the other side of any bridges that may be on this bus plus
1144 * any devices.
1145 *
1146 * Return how far we've got finding sub-buses.
1147 */
1148 pr_debug("PCI: Bus scan for %04x:%02x returning with max=%02x\n",
1149 pci_domain_nr(bus), bus->number, max);
1150 return max;
1151 }
1152
1153 struct pci_bus * pci_create_bus(struct device *parent,
1154 int bus, struct pci_ops *ops, void *sysdata)
1155 {
1156 int error;
1157 struct pci_bus *b;
1158 struct device *dev;
1159
1160 b = pci_alloc_bus();
1161 if (!b)
1162 return NULL;
1163
1164 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
1165 if (!dev){
1166 kfree(b);
1167 return NULL;
1168 }
1169
1170 b->sysdata = sysdata;
1171 b->ops = ops;
1172
1173 if (pci_find_bus(pci_domain_nr(b), bus)) {
1174 /* If we already got to this bus through a different bridge, ignore it */
1175 pr_debug("PCI: Bus %04x:%02x already known\n", pci_domain_nr(b), bus);
1176 goto err_out;
1177 }
1178
1179 down_write(&pci_bus_sem);
1180 list_add_tail(&b->node, &pci_root_buses);
1181 up_write(&pci_bus_sem);
1182
1183 dev->parent = parent;
1184 dev->release = pci_release_bus_bridge_dev;
1185 dev_set_name(dev, "pci%04x:%02x", pci_domain_nr(b), bus);
1186 error = device_register(dev);
1187 if (error)
1188 goto dev_reg_err;
1189 b->bridge = get_device(dev);
1190
1191 if (!parent)
1192 set_dev_node(b->bridge, pcibus_to_node(b));
1193
1194 b->dev.class = &pcibus_class;
1195 b->dev.parent = b->bridge;
1196 dev_set_name(&b->dev, "%04x:%02x", pci_domain_nr(b), bus);
1197 error = device_register(&b->dev);
1198 if (error)
1199 goto class_dev_reg_err;
1200 error = device_create_file(&b->dev, &dev_attr_cpuaffinity);
1201 if (error)
1202 goto dev_create_file_err;
1203
1204 /* Create legacy_io and legacy_mem files for this bus */
1205 pci_create_legacy_files(b);
1206
1207 b->number = b->secondary = bus;
1208 b->resource[0] = &ioport_resource;
1209 b->resource[1] = &iomem_resource;
1210
1211 return b;
1212
1213 dev_create_file_err:
1214 device_unregister(&b->dev);
1215 class_dev_reg_err:
1216 device_unregister(dev);
1217 dev_reg_err:
1218 down_write(&pci_bus_sem);
1219 list_del(&b->node);
1220 up_write(&pci_bus_sem);
1221 err_out:
1222 kfree(dev);
1223 kfree(b);
1224 return NULL;
1225 }
1226
1227 struct pci_bus * __devinit pci_scan_bus_parented(struct device *parent,
1228 int bus, struct pci_ops *ops, void *sysdata)
1229 {
1230 struct pci_bus *b;
1231
1232 b = pci_create_bus(parent, bus, ops, sysdata);
1233 if (b)
1234 b->subordinate = pci_scan_child_bus(b);
1235 return b;
1236 }
1237 EXPORT_SYMBOL(pci_scan_bus_parented);
1238
1239 #ifdef CONFIG_HOTPLUG
1240 /**
1241 * pci_rescan_bus - scan a PCI bus for devices.
1242 * @bus: PCI bus to scan
1243 *
1244 * Scan a PCI bus and child buses for new devices, adds them,
1245 * and enables them.
1246 *
1247 * Returns the max number of subordinate bus discovered.
1248 */
1249 unsigned int __ref pci_rescan_bus(struct pci_bus *bus)
1250 {
1251 unsigned int max;
1252 struct pci_dev *dev;
1253
1254 max = pci_scan_child_bus(bus);
1255
1256 down_read(&pci_bus_sem);
1257 list_for_each_entry(dev, &bus->devices, bus_list)
1258 if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE ||
1259 dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)
1260 if (dev->subordinate)
1261 pci_bus_size_bridges(dev->subordinate);
1262 up_read(&pci_bus_sem);
1263
1264 pci_bus_assign_resources(bus);
1265 pci_enable_bridges(bus);
1266 pci_bus_add_devices(bus);
1267
1268 return max;
1269 }
1270 EXPORT_SYMBOL_GPL(pci_rescan_bus);
1271
1272 EXPORT_SYMBOL(pci_add_new_bus);
1273 EXPORT_SYMBOL(pci_scan_slot);
1274 EXPORT_SYMBOL(pci_scan_bridge);
1275 EXPORT_SYMBOL_GPL(pci_scan_child_bus);
1276 #endif
1277
1278 static int __init pci_sort_bf_cmp(const struct device *d_a, const struct device *d_b)
1279 {
1280 const struct pci_dev *a = to_pci_dev(d_a);
1281 const struct pci_dev *b = to_pci_dev(d_b);
1282
1283 if (pci_domain_nr(a->bus) < pci_domain_nr(b->bus)) return -1;
1284 else if (pci_domain_nr(a->bus) > pci_domain_nr(b->bus)) return 1;
1285
1286 if (a->bus->number < b->bus->number) return -1;
1287 else if (a->bus->number > b->bus->number) return 1;
1288
1289 if (a->devfn < b->devfn) return -1;
1290 else if (a->devfn > b->devfn) return 1;
1291
1292 return 0;
1293 }
1294
1295 void __init pci_sort_breadthfirst(void)
1296 {
1297 bus_sort_breadthfirst(&pci_bus_type, &pci_sort_bf_cmp);
1298 }
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree