2 * probe.c - PCI detection and setup code
5 #include <linux/kernel.h>
6 #include <linux/delay.h>
7 #include <linux/init.h>
9 #include <linux/slab.h>
10 #include <linux/module.h>
11 #include <linux/cpumask.h>
12 #include <linux/pci-aspm.h>
15 #define CARDBUS_LATENCY_TIMER 176 /* secondary latency timer */
16 #define CARDBUS_RESERVE_BUSNR 3
17 #define PCI_CFG_SPACE_SIZE 256
18 #define PCI_CFG_SPACE_EXP_SIZE 4096
20 /* Ugh. Need to stop exporting this to modules. */
21 LIST_HEAD(pci_root_buses);
22 EXPORT_SYMBOL(pci_root_buses);
25 static int find_anything(struct device *dev, void *data)
31 * Some device drivers need know if pci is initiated.
32 * Basically, we think pci is not initiated when there
33 * is no device to be found on the pci_bus_type.
35 int no_pci_devices(void)
40 dev = bus_find_device(&pci_bus_type, NULL, NULL, find_anything);
41 no_devices = (dev == NULL);
45 EXPORT_SYMBOL(no_pci_devices);
47 #ifdef HAVE_PCI_LEGACY
49 * pci_create_legacy_files - create legacy I/O port and memory files
50 * @b: bus to create files under
52 * Some platforms allow access to legacy I/O port and ISA memory space on
53 * a per-bus basis. This routine creates the files and ties them into
54 * their associated read, write and mmap files from pci-sysfs.c
56 static void pci_create_legacy_files(struct pci_bus *b)
58 b->legacy_io = kzalloc(sizeof(struct bin_attribute) * 2,
61 b->legacy_io->attr.name = "legacy_io";
62 b->legacy_io->size = 0xffff;
63 b->legacy_io->attr.mode = S_IRUSR | S_IWUSR;
64 b->legacy_io->read = pci_read_legacy_io;
65 b->legacy_io->write = pci_write_legacy_io;
66 device_create_bin_file(&b->dev, b->legacy_io);
68 /* Allocated above after the legacy_io struct */
69 b->legacy_mem = b->legacy_io + 1;
70 b->legacy_mem->attr.name = "legacy_mem";
71 b->legacy_mem->size = 1024*1024;
72 b->legacy_mem->attr.mode = S_IRUSR | S_IWUSR;
73 b->legacy_mem->mmap = pci_mmap_legacy_mem;
74 device_create_bin_file(&b->dev, b->legacy_mem);
78 void pci_remove_legacy_files(struct pci_bus *b)
81 device_remove_bin_file(&b->dev, b->legacy_io);
82 device_remove_bin_file(&b->dev, b->legacy_mem);
83 kfree(b->legacy_io); /* both are allocated here */
86 #else /* !HAVE_PCI_LEGACY */
87 static inline void pci_create_legacy_files(struct pci_bus *bus) { return; }
88 void pci_remove_legacy_files(struct pci_bus *bus) { return; }
89 #endif /* HAVE_PCI_LEGACY */
92 * PCI Bus Class Devices
94 static ssize_t pci_bus_show_cpuaffinity(struct device *dev,
96 struct device_attribute *attr,
102 cpumask = pcibus_to_cpumask(to_pci_bus(dev));
104 cpulist_scnprintf(buf, PAGE_SIZE-2, cpumask):
105 cpumask_scnprintf(buf, PAGE_SIZE-2, cpumask);
111 static ssize_t inline pci_bus_show_cpumaskaffinity(struct device *dev,
112 struct device_attribute *attr,
115 return pci_bus_show_cpuaffinity(dev, 0, attr, buf);
118 static ssize_t inline pci_bus_show_cpulistaffinity(struct device *dev,
119 struct device_attribute *attr,
122 return pci_bus_show_cpuaffinity(dev, 1, attr, buf);
125 DEVICE_ATTR(cpuaffinity, S_IRUGO, pci_bus_show_cpumaskaffinity, NULL);
126 DEVICE_ATTR(cpulistaffinity, S_IRUGO, pci_bus_show_cpulistaffinity, NULL);
131 static void release_pcibus_dev(struct device *dev)
133 struct pci_bus *pci_bus = to_pci_bus(dev);
136 put_device(pci_bus->bridge);
140 static struct class pcibus_class = {
142 .dev_release = &release_pcibus_dev,
145 static int __init pcibus_class_init(void)
147 return class_register(&pcibus_class);
149 postcore_initcall(pcibus_class_init);
152 * Translate the low bits of the PCI base
153 * to the resource type
155 static inline unsigned int pci_calc_resource_flags(unsigned int flags)
157 if (flags & PCI_BASE_ADDRESS_SPACE_IO)
158 return IORESOURCE_IO;
160 if (flags & PCI_BASE_ADDRESS_MEM_PREFETCH)
161 return IORESOURCE_MEM | IORESOURCE_PREFETCH;
163 return IORESOURCE_MEM;
166 static u64 pci_size(u64 base, u64 maxbase, u64 mask)
168 u64 size = mask & maxbase; /* Find the significant bits */
172 /* Get the lowest of them to find the decode size, and
173 from that the extent. */
174 size = (size & ~(size-1)) - 1;
176 /* base == maxbase can be valid only if the BAR has
177 already been programmed with all 1s. */
178 if (base == maxbase && ((base | size) & mask) != mask)
185 pci_bar_unknown, /* Standard PCI BAR probe */
186 pci_bar_io, /* An io port BAR */
187 pci_bar_mem32, /* A 32-bit memory BAR */
188 pci_bar_mem64, /* A 64-bit memory BAR */
191 static inline enum pci_bar_type decode_bar(struct resource *res, u32 bar)
193 if ((bar & PCI_BASE_ADDRESS_SPACE) == PCI_BASE_ADDRESS_SPACE_IO) {
194 res->flags = bar & ~PCI_BASE_ADDRESS_IO_MASK;
198 res->flags = bar & ~PCI_BASE_ADDRESS_MEM_MASK;
200 if (res->flags == PCI_BASE_ADDRESS_MEM_TYPE_64)
201 return pci_bar_mem64;
202 return pci_bar_mem32;
206 * If the type is not unknown, we assume that the lowest bit is 'enable'.
207 * Returns 1 if the BAR was 64-bit and 0 if it was 32-bit.
209 static int __pci_read_base(struct pci_dev *dev, enum pci_bar_type type,
210 struct resource *res, unsigned int pos)
214 mask = type ? ~PCI_ROM_ADDRESS_ENABLE : ~0;
216 res->name = pci_name(dev);
218 pci_read_config_dword(dev, pos, &l);
219 pci_write_config_dword(dev, pos, mask);
220 pci_read_config_dword(dev, pos, &sz);
221 pci_write_config_dword(dev, pos, l);
224 * All bits set in sz means the device isn't working properly.
225 * If the BAR isn't implemented, all bits must be 0. If it's a
226 * memory BAR or a ROM, bit 0 must be clear; if it's an io BAR, bit
229 if (!sz || sz == 0xffffffff)
233 * I don't know how l can have all bits set. Copied from old code.
234 * Maybe it fixes a bug on some ancient platform.
239 if (type == pci_bar_unknown) {
240 type = decode_bar(res, l);
241 res->flags |= pci_calc_resource_flags(l) | IORESOURCE_SIZEALIGN;
242 if (type == pci_bar_io) {
243 l &= PCI_BASE_ADDRESS_IO_MASK;
244 mask = PCI_BASE_ADDRESS_IO_MASK & 0xffff;
246 l &= PCI_BASE_ADDRESS_MEM_MASK;
247 mask = (u32)PCI_BASE_ADDRESS_MEM_MASK;
250 res->flags |= (l & IORESOURCE_ROM_ENABLE);
251 l &= PCI_ROM_ADDRESS_MASK;
252 mask = (u32)PCI_ROM_ADDRESS_MASK;
255 if (type == pci_bar_mem64) {
258 u64 mask64 = mask | (u64)~0 << 32;
260 pci_read_config_dword(dev, pos + 4, &l);
261 pci_write_config_dword(dev, pos + 4, ~0);
262 pci_read_config_dword(dev, pos + 4, &sz);
263 pci_write_config_dword(dev, pos + 4, l);
265 l64 |= ((u64)l << 32);
266 sz64 |= ((u64)sz << 32);
268 sz64 = pci_size(l64, sz64, mask64);
273 if ((sizeof(resource_size_t) < 8) && (sz64 > 0x100000000ULL)) {
274 dev_err(&dev->dev, "can't handle 64-bit BAR\n");
276 } else if ((sizeof(resource_size_t) < 8) && l) {
277 /* Address above 32-bit boundary; disable the BAR */
278 pci_write_config_dword(dev, pos, 0);
279 pci_write_config_dword(dev, pos + 4, 0);
284 res->end = l64 + sz64;
287 sz = pci_size(l, sz, mask);
297 return (type == pci_bar_mem64) ? 1 : 0;
303 static void pci_read_bases(struct pci_dev *dev, unsigned int howmany, int rom)
305 unsigned int pos, reg;
307 for (pos = 0; pos < howmany; pos++) {
308 struct resource *res = &dev->resource[pos];
309 reg = PCI_BASE_ADDRESS_0 + (pos << 2);
310 pos += __pci_read_base(dev, pci_bar_unknown, res, reg);
314 struct resource *res = &dev->resource[PCI_ROM_RESOURCE];
315 dev->rom_base_reg = rom;
316 res->flags = IORESOURCE_MEM | IORESOURCE_PREFETCH |
317 IORESOURCE_READONLY | IORESOURCE_CACHEABLE |
318 IORESOURCE_SIZEALIGN;
319 __pci_read_base(dev, pci_bar_mem32, res, rom);
323 void __devinit pci_read_bridge_bases(struct pci_bus *child)
325 struct pci_dev *dev = child->self;
326 u8 io_base_lo, io_limit_lo;
327 u16 mem_base_lo, mem_limit_lo;
328 unsigned long base, limit;
329 struct resource *res;
332 if (!dev) /* It's a host bus, nothing to read */
335 if (dev->transparent) {
336 dev_info(&dev->dev, "transparent bridge\n");
337 for(i = 3; i < PCI_BUS_NUM_RESOURCES; i++)
338 child->resource[i] = child->parent->resource[i - 3];
342 child->resource[i] = &dev->resource[PCI_BRIDGE_RESOURCES+i];
344 res = child->resource[0];
345 pci_read_config_byte(dev, PCI_IO_BASE, &io_base_lo);
346 pci_read_config_byte(dev, PCI_IO_LIMIT, &io_limit_lo);
347 base = (io_base_lo & PCI_IO_RANGE_MASK) << 8;
348 limit = (io_limit_lo & PCI_IO_RANGE_MASK) << 8;
350 if ((io_base_lo & PCI_IO_RANGE_TYPE_MASK) == PCI_IO_RANGE_TYPE_32) {
351 u16 io_base_hi, io_limit_hi;
352 pci_read_config_word(dev, PCI_IO_BASE_UPPER16, &io_base_hi);
353 pci_read_config_word(dev, PCI_IO_LIMIT_UPPER16, &io_limit_hi);
354 base |= (io_base_hi << 16);
355 limit |= (io_limit_hi << 16);
359 res->flags = (io_base_lo & PCI_IO_RANGE_TYPE_MASK) | IORESOURCE_IO;
363 res->end = limit + 0xfff;
366 res = child->resource[1];
367 pci_read_config_word(dev, PCI_MEMORY_BASE, &mem_base_lo);
368 pci_read_config_word(dev, PCI_MEMORY_LIMIT, &mem_limit_lo);
369 base = (mem_base_lo & PCI_MEMORY_RANGE_MASK) << 16;
370 limit = (mem_limit_lo & PCI_MEMORY_RANGE_MASK) << 16;
372 res->flags = (mem_base_lo & PCI_MEMORY_RANGE_TYPE_MASK) | IORESOURCE_MEM;
374 res->end = limit + 0xfffff;
377 res = child->resource[2];
378 pci_read_config_word(dev, PCI_PREF_MEMORY_BASE, &mem_base_lo);
379 pci_read_config_word(dev, PCI_PREF_MEMORY_LIMIT, &mem_limit_lo);
380 base = (mem_base_lo & PCI_PREF_RANGE_MASK) << 16;
381 limit = (mem_limit_lo & PCI_PREF_RANGE_MASK) << 16;
383 if ((mem_base_lo & PCI_PREF_RANGE_TYPE_MASK) == PCI_PREF_RANGE_TYPE_64) {
384 u32 mem_base_hi, mem_limit_hi;
385 pci_read_config_dword(dev, PCI_PREF_BASE_UPPER32, &mem_base_hi);
386 pci_read_config_dword(dev, PCI_PREF_LIMIT_UPPER32, &mem_limit_hi);
389 * Some bridges set the base > limit by default, and some
390 * (broken) BIOSes do not initialize them. If we find
391 * this, just assume they are not being used.
393 if (mem_base_hi <= mem_limit_hi) {
394 #if BITS_PER_LONG == 64
395 base |= ((long) mem_base_hi) << 32;
396 limit |= ((long) mem_limit_hi) << 32;
398 if (mem_base_hi || mem_limit_hi) {
399 dev_err(&dev->dev, "can't handle 64-bit "
400 "address space for bridge\n");
407 res->flags = (mem_base_lo & PCI_MEMORY_RANGE_TYPE_MASK) | IORESOURCE_MEM | IORESOURCE_PREFETCH;
409 res->end = limit + 0xfffff;
413 static struct pci_bus * pci_alloc_bus(void)
417 b = kzalloc(sizeof(*b), GFP_KERNEL);
419 INIT_LIST_HEAD(&b->node);
420 INIT_LIST_HEAD(&b->children);
421 INIT_LIST_HEAD(&b->devices);
422 INIT_LIST_HEAD(&b->slots);
427 static struct pci_bus *pci_alloc_child_bus(struct pci_bus *parent,
428 struct pci_dev *bridge, int busnr)
430 struct pci_bus *child;
434 * Allocate a new bus, and inherit stuff from the parent..
436 child = pci_alloc_bus();
440 child->self = bridge;
441 child->parent = parent;
442 child->ops = parent->ops;
443 child->sysdata = parent->sysdata;
444 child->bus_flags = parent->bus_flags;
445 child->bridge = get_device(&bridge->dev);
447 /* initialize some portions of the bus device, but don't register it
448 * now as the parent is not properly set up yet. This device will get
449 * registered later in pci_bus_add_devices()
451 child->dev.class = &pcibus_class;
452 sprintf(child->dev.bus_id, "%04x:%02x", pci_domain_nr(child), busnr);
455 * Set up the primary, secondary and subordinate
458 child->number = child->secondary = busnr;
459 child->primary = parent->secondary;
460 child->subordinate = 0xff;
462 /* Set up default resource pointers and names.. */
463 for (i = 0; i < 4; i++) {
464 child->resource[i] = &bridge->resource[PCI_BRIDGE_RESOURCES+i];
465 child->resource[i]->name = child->name;
467 bridge->subordinate = child;
472 struct pci_bus *__ref pci_add_new_bus(struct pci_bus *parent, struct pci_dev *dev, int busnr)
474 struct pci_bus *child;
476 child = pci_alloc_child_bus(parent, dev, busnr);
478 down_write(&pci_bus_sem);
479 list_add_tail(&child->node, &parent->children);
480 up_write(&pci_bus_sem);
485 static void pci_fixup_parent_subordinate_busnr(struct pci_bus *child, int max)
487 struct pci_bus *parent = child->parent;
489 /* Attempts to fix that up are really dangerous unless
490 we're going to re-assign all bus numbers. */
491 if (!pcibios_assign_all_busses())
494 while (parent->parent && parent->subordinate < max) {
495 parent->subordinate = max;
496 pci_write_config_byte(parent->self, PCI_SUBORDINATE_BUS, max);
497 parent = parent->parent;
502 * If it's a bridge, configure it and scan the bus behind it.
503 * For CardBus bridges, we don't scan behind as the devices will
504 * be handled by the bridge driver itself.
506 * We need to process bridges in two passes -- first we scan those
507 * already configured by the BIOS and after we are done with all of
508 * them, we proceed to assigning numbers to the remaining buses in
509 * order to avoid overlaps between old and new bus numbers.
511 int __devinit pci_scan_bridge(struct pci_bus *bus, struct pci_dev *dev, int max, int pass)
513 struct pci_bus *child;
514 int is_cardbus = (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS);
518 pci_read_config_dword(dev, PCI_PRIMARY_BUS, &buses);
520 dev_dbg(&dev->dev, "scanning behind bridge, config %06x, pass %d\n",
521 buses & 0xffffff, pass);
523 /* Disable MasterAbortMode during probing to avoid reporting
524 of bus errors (in some architectures) */
525 pci_read_config_word(dev, PCI_BRIDGE_CONTROL, &bctl);
526 pci_write_config_word(dev, PCI_BRIDGE_CONTROL,
527 bctl & ~PCI_BRIDGE_CTL_MASTER_ABORT);
529 if ((buses & 0xffff00) && !pcibios_assign_all_busses() && !is_cardbus) {
530 unsigned int cmax, busnr;
532 * Bus already configured by firmware, process it in the first
533 * pass and just note the configuration.
537 busnr = (buses >> 8) & 0xFF;
540 * If we already got to this bus through a different bridge,
541 * ignore it. This can happen with the i450NX chipset.
543 if (pci_find_bus(pci_domain_nr(bus), busnr)) {
544 dev_info(&dev->dev, "bus %04x:%02x already known\n",
545 pci_domain_nr(bus), busnr);
549 child = pci_add_new_bus(bus, dev, busnr);
552 child->primary = buses & 0xFF;
553 child->subordinate = (buses >> 16) & 0xFF;
554 child->bridge_ctl = bctl;
556 cmax = pci_scan_child_bus(child);
559 if (child->subordinate > max)
560 max = child->subordinate;
563 * We need to assign a number to this bus which we always
564 * do in the second pass.
567 if (pcibios_assign_all_busses())
568 /* Temporarily disable forwarding of the
569 configuration cycles on all bridges in
570 this bus segment to avoid possible
571 conflicts in the second pass between two
572 bridges programmed with overlapping
574 pci_write_config_dword(dev, PCI_PRIMARY_BUS,
580 pci_write_config_word(dev, PCI_STATUS, 0xffff);
582 /* Prevent assigning a bus number that already exists.
583 * This can happen when a bridge is hot-plugged */
584 if (pci_find_bus(pci_domain_nr(bus), max+1))
586 child = pci_add_new_bus(bus, dev, ++max);
587 buses = (buses & 0xff000000)
588 | ((unsigned int)(child->primary) << 0)
589 | ((unsigned int)(child->secondary) << 8)
590 | ((unsigned int)(child->subordinate) << 16);
593 * yenta.c forces a secondary latency timer of 176.
594 * Copy that behaviour here.
597 buses &= ~0xff000000;
598 buses |= CARDBUS_LATENCY_TIMER << 24;
602 * We need to blast all three values with a single write.
604 pci_write_config_dword(dev, PCI_PRIMARY_BUS, buses);
607 child->bridge_ctl = bctl;
609 * Adjust subordinate busnr in parent buses.
610 * We do this before scanning for children because
611 * some devices may not be detected if the bios
614 pci_fixup_parent_subordinate_busnr(child, max);
615 /* Now we can scan all subordinate buses... */
616 max = pci_scan_child_bus(child);
618 * now fix it up again since we have found
619 * the real value of max.
621 pci_fixup_parent_subordinate_busnr(child, max);
624 * For CardBus bridges, we leave 4 bus numbers
625 * as cards with a PCI-to-PCI bridge can be
628 for (i=0; i<CARDBUS_RESERVE_BUSNR; i++) {
629 struct pci_bus *parent = bus;
630 if (pci_find_bus(pci_domain_nr(bus),
633 while (parent->parent) {
634 if ((!pcibios_assign_all_busses()) &&
635 (parent->subordinate > max) &&
636 (parent->subordinate <= max+i)) {
639 parent = parent->parent;
643 * Often, there are two cardbus bridges
644 * -- try to leave one valid bus number
652 pci_fixup_parent_subordinate_busnr(child, max);
655 * Set the subordinate bus number to its real value.
657 child->subordinate = max;
658 pci_write_config_byte(dev, PCI_SUBORDINATE_BUS, max);
662 (is_cardbus ? "PCI CardBus %04x:%02x" : "PCI Bus %04x:%02x"),
663 pci_domain_nr(bus), child->number);
665 /* Has only triggered on CardBus, fixup is in yenta_socket */
666 while (bus->parent) {
667 if ((child->subordinate > bus->subordinate) ||
668 (child->number > bus->subordinate) ||
669 (child->number < bus->number) ||
670 (child->subordinate < bus->number)) {
671 pr_debug("PCI: Bus #%02x (-#%02x) is %s "
672 "hidden behind%s bridge #%02x (-#%02x)\n",
673 child->number, child->subordinate,
674 (bus->number > child->subordinate &&
675 bus->subordinate < child->number) ?
676 "wholly" : "partially",
677 bus->self->transparent ? " transparent" : "",
678 bus->number, bus->subordinate);
684 pci_write_config_word(dev, PCI_BRIDGE_CONTROL, bctl);
690 * Read interrupt line and base address registers.
691 * The architecture-dependent code can tweak these, of course.
693 static void pci_read_irq(struct pci_dev *dev)
697 pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &irq);
700 pci_read_config_byte(dev, PCI_INTERRUPT_LINE, &irq);
704 #define LEGACY_IO_RESOURCE (IORESOURCE_IO | IORESOURCE_PCI_FIXED)
707 * pci_setup_device - fill in class and map information of a device
708 * @dev: the device structure to fill
710 * Initialize the device structure with information about the device's
711 * vendor,class,memory and IO-space addresses,IRQ lines etc.
712 * Called at initialisation of the PCI subsystem and by CardBus services.
713 * Returns 0 on success and -1 if unknown type of device (not normal, bridge
716 static int pci_setup_device(struct pci_dev * dev)
720 dev_set_name(&dev->dev, "%04x:%02x:%02x.%d", pci_domain_nr(dev->bus),
721 dev->bus->number, PCI_SLOT(dev->devfn),
722 PCI_FUNC(dev->devfn));
724 pci_read_config_dword(dev, PCI_CLASS_REVISION, &class);
725 dev->revision = class & 0xff;
726 class >>= 8; /* upper 3 bytes */
730 dev_dbg(&dev->dev, "found [%04x/%04x] class %06x header type %02x\n",
731 dev->vendor, dev->device, class, dev->hdr_type);
733 /* "Unknown power state" */
734 dev->current_state = PCI_UNKNOWN;
736 /* Early fixups, before probing the BARs */
737 pci_fixup_device(pci_fixup_early, dev);
738 class = dev->class >> 8;
740 switch (dev->hdr_type) { /* header type */
741 case PCI_HEADER_TYPE_NORMAL: /* standard header */
742 if (class == PCI_CLASS_BRIDGE_PCI)
745 pci_read_bases(dev, 6, PCI_ROM_ADDRESS);
746 pci_read_config_word(dev, PCI_SUBSYSTEM_VENDOR_ID, &dev->subsystem_vendor);
747 pci_read_config_word(dev, PCI_SUBSYSTEM_ID, &dev->subsystem_device);
750 * Do the ugly legacy mode stuff here rather than broken chip
751 * quirk code. Legacy mode ATA controllers have fixed
752 * addresses. These are not always echoed in BAR0-3, and
753 * BAR0-3 in a few cases contain junk!
755 if (class == PCI_CLASS_STORAGE_IDE) {
757 pci_read_config_byte(dev, PCI_CLASS_PROG, &progif);
758 if ((progif & 1) == 0) {
759 dev->resource[0].start = 0x1F0;
760 dev->resource[0].end = 0x1F7;
761 dev->resource[0].flags = LEGACY_IO_RESOURCE;
762 dev->resource[1].start = 0x3F6;
763 dev->resource[1].end = 0x3F6;
764 dev->resource[1].flags = LEGACY_IO_RESOURCE;
766 if ((progif & 4) == 0) {
767 dev->resource[2].start = 0x170;
768 dev->resource[2].end = 0x177;
769 dev->resource[2].flags = LEGACY_IO_RESOURCE;
770 dev->resource[3].start = 0x376;
771 dev->resource[3].end = 0x376;
772 dev->resource[3].flags = LEGACY_IO_RESOURCE;
777 case PCI_HEADER_TYPE_BRIDGE: /* bridge header */
778 if (class != PCI_CLASS_BRIDGE_PCI)
780 /* The PCI-to-PCI bridge spec requires that subtractive
781 decoding (i.e. transparent) bridge must have programming
782 interface code of 0x01. */
784 dev->transparent = ((dev->class & 0xff) == 1);
785 pci_read_bases(dev, 2, PCI_ROM_ADDRESS1);
788 case PCI_HEADER_TYPE_CARDBUS: /* CardBus bridge header */
789 if (class != PCI_CLASS_BRIDGE_CARDBUS)
792 pci_read_bases(dev, 1, 0);
793 pci_read_config_word(dev, PCI_CB_SUBSYSTEM_VENDOR_ID, &dev->subsystem_vendor);
794 pci_read_config_word(dev, PCI_CB_SUBSYSTEM_ID, &dev->subsystem_device);
797 default: /* unknown header */
798 dev_err(&dev->dev, "unknown header type %02x, "
799 "ignoring device\n", dev->hdr_type);
803 dev_err(&dev->dev, "ignoring class %02x (doesn't match header "
804 "type %02x)\n", class, dev->hdr_type);
805 dev->class = PCI_CLASS_NOT_DEFINED;
808 /* We found a fine healthy device, go go go... */
813 * pci_release_dev - free a pci device structure when all users of it are finished.
814 * @dev: device that's been disconnected
816 * Will be called only by the device core when all users of this pci device are
819 static void pci_release_dev(struct device *dev)
821 struct pci_dev *pci_dev;
823 pci_dev = to_pci_dev(dev);
824 pci_vpd_release(pci_dev);
828 static void set_pcie_port_type(struct pci_dev *pdev)
833 pos = pci_find_capability(pdev, PCI_CAP_ID_EXP);
837 pci_read_config_word(pdev, pos + PCI_EXP_FLAGS, ®16);
838 pdev->pcie_type = (reg16 & PCI_EXP_FLAGS_TYPE) >> 4;
842 * pci_cfg_space_size - get the configuration space size of the PCI device.
845 * Regular PCI devices have 256 bytes, but PCI-X 2 and PCI Express devices
846 * have 4096 bytes. Even if the device is capable, that doesn't mean we can
847 * access it. Maybe we don't have a way to generate extended config space
848 * accesses, or the device is behind a reverse Express bridge. So we try
849 * reading the dword at 0x100 which must either be 0 or a valid extended
852 int pci_cfg_space_size_ext(struct pci_dev *dev)
856 if (pci_read_config_dword(dev, 256, &status) != PCIBIOS_SUCCESSFUL)
858 if (status == 0xffffffff)
861 return PCI_CFG_SPACE_EXP_SIZE;
864 return PCI_CFG_SPACE_SIZE;
867 int pci_cfg_space_size(struct pci_dev *dev)
872 pos = pci_find_capability(dev, PCI_CAP_ID_EXP);
874 pos = pci_find_capability(dev, PCI_CAP_ID_PCIX);
878 pci_read_config_dword(dev, pos + PCI_X_STATUS, &status);
879 if (!(status & (PCI_X_STATUS_266MHZ | PCI_X_STATUS_533MHZ)))
883 return pci_cfg_space_size_ext(dev);
886 return PCI_CFG_SPACE_SIZE;
889 static void pci_release_bus_bridge_dev(struct device *dev)
894 struct pci_dev *alloc_pci_dev(void)
898 dev = kzalloc(sizeof(struct pci_dev), GFP_KERNEL);
902 INIT_LIST_HEAD(&dev->bus_list);
904 pci_msi_init_pci_dev(dev);
908 EXPORT_SYMBOL(alloc_pci_dev);
911 * Read the config data for a PCI device, sanity-check it
912 * and fill in the dev structure...
914 static struct pci_dev *pci_scan_device(struct pci_bus *bus, int devfn)
921 if (pci_bus_read_config_dword(bus, devfn, PCI_VENDOR_ID, &l))
924 /* some broken boards return 0 or ~0 if a slot is empty: */
925 if (l == 0xffffffff || l == 0x00000000 ||
926 l == 0x0000ffff || l == 0xffff0000)
929 /* Configuration request Retry Status */
930 while (l == 0xffff0001) {
933 if (pci_bus_read_config_dword(bus, devfn, PCI_VENDOR_ID, &l))
935 /* Card hasn't responded in 60 seconds? Must be stuck. */
936 if (delay > 60 * 1000) {
937 printk(KERN_WARNING "pci %04x:%02x:%02x.%d: not "
938 "responding\n", pci_domain_nr(bus),
939 bus->number, PCI_SLOT(devfn),
945 if (pci_bus_read_config_byte(bus, devfn, PCI_HEADER_TYPE, &hdr_type))
948 dev = alloc_pci_dev();
953 dev->sysdata = bus->sysdata;
954 dev->dev.parent = bus->bridge;
955 dev->dev.bus = &pci_bus_type;
957 dev->hdr_type = hdr_type & 0x7f;
958 dev->multifunction = !!(hdr_type & 0x80);
959 dev->vendor = l & 0xffff;
960 dev->device = (l >> 16) & 0xffff;
961 dev->cfg_size = pci_cfg_space_size(dev);
962 dev->error_state = pci_channel_io_normal;
963 set_pcie_port_type(dev);
965 /* Assume 32-bit PCI; let 64-bit PCI cards (which are far rarer)
966 set this higher, assuming the system even supports it. */
967 dev->dma_mask = 0xffffffff;
968 if (pci_setup_device(dev) < 0) {
973 pci_vpd_pci22_init(dev);
978 void pci_device_add(struct pci_dev *dev, struct pci_bus *bus)
980 device_initialize(&dev->dev);
981 dev->dev.release = pci_release_dev;
984 dev->dev.dma_mask = &dev->dma_mask;
985 dev->dev.dma_parms = &dev->dma_parms;
986 dev->dev.coherent_dma_mask = 0xffffffffull;
988 pci_set_dma_max_seg_size(dev, 65536);
989 pci_set_dma_seg_boundary(dev, 0xffffffff);
991 /* Fix up broken headers */
992 pci_fixup_device(pci_fixup_header, dev);
994 /* Initialize power management of the device */
998 * Add the device to our list of discovered devices
999 * and the bus list for fixup functions, etc.
1001 down_write(&pci_bus_sem);
1002 list_add_tail(&dev->bus_list, &bus->devices);
1003 up_write(&pci_bus_sem);
1006 struct pci_dev *__ref pci_scan_single_device(struct pci_bus *bus, int devfn)
1008 struct pci_dev *dev;
1010 dev = pci_scan_device(bus, devfn);
1014 pci_device_add(dev, bus);
1018 EXPORT_SYMBOL(pci_scan_single_device);
1021 * pci_scan_slot - scan a PCI slot on a bus for devices.
1022 * @bus: PCI bus to scan
1023 * @devfn: slot number to scan (must have zero function.)
1025 * Scan a PCI slot on the specified PCI bus for devices, adding
1026 * discovered devices to the @bus->devices list. New devices
1027 * will not have is_added set.
1029 int pci_scan_slot(struct pci_bus *bus, int devfn)
1034 scan_all_fns = pcibios_scan_all_fns(bus, devfn);
1036 for (func = 0; func < 8; func++, devfn++) {
1037 struct pci_dev *dev;
1039 dev = pci_scan_single_device(bus, devfn);
1044 * If this is a single function device,
1045 * don't scan past the first function.
1047 if (!dev->multifunction) {
1049 dev->multifunction = 1;
1055 if (func == 0 && !scan_all_fns)
1060 /* only one slot has pcie device */
1061 if (bus->self && nr)
1062 pcie_aspm_init_link_state(bus->self);
1067 unsigned int __devinit pci_scan_child_bus(struct pci_bus *bus)
1069 unsigned int devfn, pass, max = bus->secondary;
1070 struct pci_dev *dev;
1072 pr_debug("PCI: Scanning bus %04x:%02x\n", pci_domain_nr(bus), bus->number);
1074 /* Go find them, Rover! */
1075 for (devfn = 0; devfn < 0x100; devfn += 8)
1076 pci_scan_slot(bus, devfn);
1079 * After performing arch-dependent fixup of the bus, look behind
1080 * all PCI-to-PCI bridges on this bus.
1082 pr_debug("PCI: Fixups for bus %04x:%02x\n", pci_domain_nr(bus), bus->number);
1083 pcibios_fixup_bus(bus);
1084 for (pass=0; pass < 2; pass++)
1085 list_for_each_entry(dev, &bus->devices, bus_list) {
1086 if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE ||
1087 dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)
1088 max = pci_scan_bridge(bus, dev, max, pass);
1092 * We've scanned the bus and so we know all about what's on
1093 * the other side of any bridges that may be on this bus plus
1096 * Return how far we've got finding sub-buses.
1098 pr_debug("PCI: Bus scan for %04x:%02x returning with max=%02x\n",
1099 pci_domain_nr(bus), bus->number, max);
1103 void __attribute__((weak)) set_pci_bus_resources_arch_default(struct pci_bus *b)
1107 struct pci_bus * pci_create_bus(struct device *parent,
1108 int bus, struct pci_ops *ops, void *sysdata)
1114 b = pci_alloc_bus();
1118 dev = kmalloc(sizeof(*dev), GFP_KERNEL);
1124 b->sysdata = sysdata;
1127 if (pci_find_bus(pci_domain_nr(b), bus)) {
1128 /* If we already got to this bus through a different bridge, ignore it */
1129 pr_debug("PCI: Bus %04x:%02x already known\n", pci_domain_nr(b), bus);
1133 down_write(&pci_bus_sem);
1134 list_add_tail(&b->node, &pci_root_buses);
1135 up_write(&pci_bus_sem);
1137 memset(dev, 0, sizeof(*dev));
1138 dev->parent = parent;
1139 dev->release = pci_release_bus_bridge_dev;
1140 sprintf(dev->bus_id, "pci%04x:%02x", pci_domain_nr(b), bus);
1141 error = device_register(dev);
1144 b->bridge = get_device(dev);
1147 set_dev_node(b->bridge, pcibus_to_node(b));
1149 b->dev.class = &pcibus_class;
1150 b->dev.parent = b->bridge;
1151 sprintf(b->dev.bus_id, "%04x:%02x", pci_domain_nr(b), bus);
1152 error = device_register(&b->dev);
1154 goto class_dev_reg_err;
1155 error = device_create_file(&b->dev, &dev_attr_cpuaffinity);
1157 goto dev_create_file_err;
1159 /* Create legacy_io and legacy_mem files for this bus */
1160 pci_create_legacy_files(b);
1162 b->number = b->secondary = bus;
1163 b->resource[0] = &ioport_resource;
1164 b->resource[1] = &iomem_resource;
1166 set_pci_bus_resources_arch_default(b);
1170 dev_create_file_err:
1171 device_unregister(&b->dev);
1173 device_unregister(dev);
1175 down_write(&pci_bus_sem);
1177 up_write(&pci_bus_sem);
1184 struct pci_bus * __devinit pci_scan_bus_parented(struct device *parent,
1185 int bus, struct pci_ops *ops, void *sysdata)
1189 b = pci_create_bus(parent, bus, ops, sysdata);
1191 b->subordinate = pci_scan_child_bus(b);
1194 EXPORT_SYMBOL(pci_scan_bus_parented);
1196 #ifdef CONFIG_HOTPLUG
1197 EXPORT_SYMBOL(pci_add_new_bus);
1198 EXPORT_SYMBOL(pci_scan_slot);
1199 EXPORT_SYMBOL(pci_scan_bridge);
1200 EXPORT_SYMBOL_GPL(pci_scan_child_bus);
1203 static int __init pci_sort_bf_cmp(const struct pci_dev *a, const struct pci_dev *b)
1205 if (pci_domain_nr(a->bus) < pci_domain_nr(b->bus)) return -1;
1206 else if (pci_domain_nr(a->bus) > pci_domain_nr(b->bus)) return 1;
1208 if (a->bus->number < b->bus->number) return -1;
1209 else if (a->bus->number > b->bus->number) return 1;
1211 if (a->devfn < b->devfn) return -1;
1212 else if (a->devfn > b->devfn) return 1;
1218 * Yes, this forcably breaks the klist abstraction temporarily. It
1219 * just wants to sort the klist, not change reference counts and
1220 * take/drop locks rapidly in the process. It does all this while
1221 * holding the lock for the list, so objects can't otherwise be
1222 * added/removed while we're swizzling.
1224 static void __init pci_insertion_sort_klist(struct pci_dev *a, struct list_head *list)
1226 struct list_head *pos;
1227 struct klist_node *n;
1231 list_for_each(pos, list) {
1232 n = container_of(pos, struct klist_node, n_node);
1233 dev = container_of(n, struct device, knode_bus);
1234 b = to_pci_dev(dev);
1235 if (pci_sort_bf_cmp(a, b) <= 0) {
1236 list_move_tail(&a->dev.knode_bus.n_node, &b->dev.knode_bus.n_node);
1240 list_move_tail(&a->dev.knode_bus.n_node, list);
1243 void __init pci_sort_breadthfirst(void)
1245 LIST_HEAD(sorted_devices);
1246 struct list_head *pos, *tmp;
1247 struct klist_node *n;
1249 struct pci_dev *pdev;
1250 struct klist *device_klist;
1252 device_klist = bus_get_device_klist(&pci_bus_type);
1254 spin_lock(&device_klist->k_lock);
1255 list_for_each_safe(pos, tmp, &device_klist->k_list) {
1256 n = container_of(pos, struct klist_node, n_node);
1257 dev = container_of(n, struct device, knode_bus);
1258 pdev = to_pci_dev(dev);
1259 pci_insertion_sort_klist(pdev, &sorted_devices);
1261 list_splice(&sorted_devices, &device_klist->k_list);
1262 spin_unlock(&device_klist->k_lock);