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>
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
19 /* Ugh. Need to stop exporting this to modules. */
20 LIST_HEAD(pci_root_buses);
21 EXPORT_SYMBOL(pci_root_buses);
23 LIST_HEAD(pci_devices);
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.
30 int no_pci_devices(void)
32 return list_empty(&pci_devices);
35 EXPORT_SYMBOL(no_pci_devices);
37 #ifdef HAVE_PCI_LEGACY
39 * pci_create_legacy_files - create legacy I/O port and memory files
40 * @b: bus to create files under
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
46 static void pci_create_legacy_files(struct pci_bus *b)
48 b->legacy_io = kzalloc(sizeof(struct bin_attribute) * 2,
51 b->legacy_io->attr.name = "legacy_io";
52 b->legacy_io->size = 0xffff;
53 b->legacy_io->attr.mode = S_IRUSR | S_IWUSR;
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);
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;
63 b->legacy_mem->mmap = pci_mmap_legacy_mem;
64 class_device_create_bin_file(&b->class_dev, b->legacy_mem);
68 void pci_remove_legacy_files(struct pci_bus *b)
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 */
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 */
82 * PCI Bus Class Devices
84 static ssize_t pci_bus_show_cpuaffinity(struct class_device *class_dev,
90 cpumask = pcibus_to_cpumask(to_pci_bus(class_dev));
91 ret = cpumask_scnprintf(buf, PAGE_SIZE, cpumask);
96 CLASS_DEVICE_ATTR(cpuaffinity, S_IRUGO, pci_bus_show_cpuaffinity, NULL);
101 static void release_pcibus_dev(struct class_device *class_dev)
103 struct pci_bus *pci_bus = to_pci_bus(class_dev);
106 put_device(pci_bus->bridge);
110 static struct class pcibus_class = {
112 .release = &release_pcibus_dev,
115 static int __init pcibus_class_init(void)
117 return class_register(&pcibus_class);
119 postcore_initcall(pcibus_class_init);
122 * Translate the low bits of the PCI base
123 * to the resource type
125 static inline unsigned int pci_calc_resource_flags(unsigned int flags)
127 if (flags & PCI_BASE_ADDRESS_SPACE_IO)
128 return IORESOURCE_IO;
130 if (flags & PCI_BASE_ADDRESS_MEM_PREFETCH)
131 return IORESOURCE_MEM | IORESOURCE_PREFETCH;
133 return IORESOURCE_MEM;
137 * Find the extent of a PCI decode..
139 static u32 pci_size(u32 base, u32 maxbase, u32 mask)
141 u32 size = mask & maxbase; /* Find the significant bits */
145 /* Get the lowest of them to find the decode size, and
146 from that the extent. */
147 size = (size & ~(size-1)) - 1;
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)
157 static u64 pci_size64(u64 base, u64 maxbase, u64 mask)
159 u64 size = mask & maxbase; /* Find the significant bits */
163 /* Get the lowest of them to find the decode size, and
164 from that the extent. */
165 size = (size & ~(size-1)) - 1;
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)
175 static inline int is_64bit_memory(u32 mask)
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))
183 static void pci_read_bases(struct pci_dev *dev, unsigned int howmany, int rom)
185 unsigned int pos, reg, next;
187 struct resource *res;
189 for(pos=0; pos<howmany; pos = next) {
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)
207 if ((l & PCI_BASE_ADDRESS_SPACE) ==
208 PCI_BASE_ADDRESS_SPACE_MEMORY) {
209 sz = pci_size(l, sz, (u32)PCI_BASE_ADDRESS_MEM_MASK);
211 * For 64bit prefetchable memory sz could be 0, if the
212 * real size is bigger than 4G, so we need to check
215 if (!is_64bit_memory(l) && !sz)
217 res->start = l & PCI_BASE_ADDRESS_MEM_MASK;
218 res->flags |= l & ~PCI_BASE_ADDRESS_MEM_MASK;
220 sz = pci_size(l, sz, PCI_BASE_ADDRESS_IO_MASK & 0xffff);
223 res->start = l & PCI_BASE_ADDRESS_IO_MASK;
224 res->flags |= l & ~PCI_BASE_ADDRESS_IO_MASK;
226 res->end = res->start + (unsigned long) sz;
227 res->flags |= pci_calc_resource_flags(l);
228 if (is_64bit_memory(l)) {
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);
235 sz64 = ((u64)szhi << 32) | raw_sz;
236 l64 = ((u64)lhi << 32) | l;
237 sz64 = pci_size64(l64, sz64, PCI_BASE_ADDRESS_MEM_MASK);
239 #if BITS_PER_LONG == 64
246 res->start = l64 & PCI_BASE_ADDRESS_MEM_MASK;
247 res->end = res->start + sz64;
249 if (sz64 > 0x100000000ULL) {
250 printk(KERN_ERR "PCI: Unable to handle 64-bit "
251 "BAR for device %s\n", pci_name(dev));
255 /* 64-bit wide address, treat as disabled */
256 pci_write_config_dword(dev, reg,
257 l & ~(u32)PCI_BASE_ADDRESS_MEM_MASK);
258 pci_write_config_dword(dev, reg+4, 0);
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);
275 if (sz && sz != 0xffffffff) {
276 sz = pci_size(l, sz, (u32)PCI_ROM_ADDRESS_MASK);
278 res->flags = (l & IORESOURCE_ROM_ENABLE) |
279 IORESOURCE_MEM | IORESOURCE_PREFETCH |
280 IORESOURCE_READONLY | IORESOURCE_CACHEABLE;
281 res->start = l & PCI_ROM_ADDRESS_MASK;
282 res->end = res->start + (unsigned long) sz;
288 void pci_read_bridge_bases(struct pci_bus *child)
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;
297 if (!dev) /* It's a host bus, nothing to read */
300 if (dev->transparent) {
301 printk(KERN_INFO "PCI: Transparent bridge - %s\n", pci_name(dev));
302 for(i = 3; i < PCI_BUS_NUM_RESOURCES; i++)
303 child->resource[i] = child->parent->resource[i - 3];
307 child->resource[i] = &dev->resource[PCI_BRIDGE_RESOURCES+i];
309 res = child->resource[0];
310 pci_read_config_byte(dev, PCI_IO_BASE, &io_base_lo);
311 pci_read_config_byte(dev, PCI_IO_LIMIT, &io_limit_lo);
312 base = (io_base_lo & PCI_IO_RANGE_MASK) << 8;
313 limit = (io_limit_lo & PCI_IO_RANGE_MASK) << 8;
315 if ((io_base_lo & PCI_IO_RANGE_TYPE_MASK) == PCI_IO_RANGE_TYPE_32) {
316 u16 io_base_hi, io_limit_hi;
317 pci_read_config_word(dev, PCI_IO_BASE_UPPER16, &io_base_hi);
318 pci_read_config_word(dev, PCI_IO_LIMIT_UPPER16, &io_limit_hi);
319 base |= (io_base_hi << 16);
320 limit |= (io_limit_hi << 16);
324 res->flags = (io_base_lo & PCI_IO_RANGE_TYPE_MASK) | IORESOURCE_IO;
328 res->end = limit + 0xfff;
331 res = child->resource[1];
332 pci_read_config_word(dev, PCI_MEMORY_BASE, &mem_base_lo);
333 pci_read_config_word(dev, PCI_MEMORY_LIMIT, &mem_limit_lo);
334 base = (mem_base_lo & PCI_MEMORY_RANGE_MASK) << 16;
335 limit = (mem_limit_lo & PCI_MEMORY_RANGE_MASK) << 16;
337 res->flags = (mem_base_lo & PCI_MEMORY_RANGE_TYPE_MASK) | IORESOURCE_MEM;
339 res->end = limit + 0xfffff;
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;
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);
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.
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;
363 if (mem_base_hi || mem_limit_hi) {
364 printk(KERN_ERR "PCI: Unable to handle 64-bit address space for bridge %s\n", pci_name(dev));
371 res->flags = (mem_base_lo & PCI_MEMORY_RANGE_TYPE_MASK) | IORESOURCE_MEM | IORESOURCE_PREFETCH;
373 res->end = limit + 0xfffff;
377 static struct pci_bus * pci_alloc_bus(void)
381 b = kzalloc(sizeof(*b), GFP_KERNEL);
383 INIT_LIST_HEAD(&b->node);
384 INIT_LIST_HEAD(&b->children);
385 INIT_LIST_HEAD(&b->devices);
390 static struct pci_bus * __devinit
391 pci_alloc_child_bus(struct pci_bus *parent, struct pci_dev *bridge, int busnr)
393 struct pci_bus *child;
398 * Allocate a new bus, and inherit stuff from the parent..
400 child = pci_alloc_bus();
404 child->self = bridge;
405 child->parent = parent;
406 child->ops = parent->ops;
407 child->sysdata = parent->sysdata;
408 child->bus_flags = parent->bus_flags;
409 child->bridge = get_device(&bridge->dev);
411 child->class_dev.class = &pcibus_class;
412 sprintf(child->class_dev.class_id, "%04x:%02x", pci_domain_nr(child), busnr);
413 retval = class_device_register(&child->class_dev);
416 retval = class_device_create_file(&child->class_dev,
417 &class_device_attr_cpuaffinity);
419 goto error_file_create;
422 * Set up the primary, secondary and subordinate
425 child->number = child->secondary = busnr;
426 child->primary = parent->secondary;
427 child->subordinate = 0xff;
429 /* Set up default resource pointers and names.. */
430 for (i = 0; i < 4; i++) {
431 child->resource[i] = &bridge->resource[PCI_BRIDGE_RESOURCES+i];
432 child->resource[i]->name = child->name;
434 bridge->subordinate = child;
439 class_device_unregister(&child->class_dev);
445 struct pci_bus *pci_add_new_bus(struct pci_bus *parent, struct pci_dev *dev, int busnr)
447 struct pci_bus *child;
449 child = pci_alloc_child_bus(parent, dev, busnr);
451 down_write(&pci_bus_sem);
452 list_add_tail(&child->node, &parent->children);
453 up_write(&pci_bus_sem);
458 static void pci_fixup_parent_subordinate_busnr(struct pci_bus *child, int max)
460 struct pci_bus *parent = child->parent;
462 /* Attempts to fix that up are really dangerous unless
463 we're going to re-assign all bus numbers. */
464 if (!pcibios_assign_all_busses())
467 while (parent->parent && parent->subordinate < max) {
468 parent->subordinate = max;
469 pci_write_config_byte(parent->self, PCI_SUBORDINATE_BUS, max);
470 parent = parent->parent;
474 unsigned int pci_scan_child_bus(struct pci_bus *bus);
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.
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.
486 int pci_scan_bridge(struct pci_bus *bus, struct pci_dev * dev, int max, int pass)
488 struct pci_bus *child;
489 int is_cardbus = (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS);
493 pci_read_config_dword(dev, PCI_PRIMARY_BUS, &buses);
495 pr_debug("PCI: Scanning behind PCI bridge %s, config %06x, pass %d\n",
496 pci_name(dev), buses & 0xffffff, pass);
498 /* Disable MasterAbortMode during probing to avoid reporting
499 of bus errors (in some architectures) */
500 pci_read_config_word(dev, PCI_BRIDGE_CONTROL, &bctl);
501 pci_write_config_word(dev, PCI_BRIDGE_CONTROL,
502 bctl & ~PCI_BRIDGE_CTL_MASTER_ABORT);
504 if ((buses & 0xffff00) && !pcibios_assign_all_busses() && !is_cardbus) {
505 unsigned int cmax, busnr;
507 * Bus already configured by firmware, process it in the first
508 * pass and just note the configuration.
512 busnr = (buses >> 8) & 0xFF;
515 * If we already got to this bus through a different bridge,
516 * ignore it. This can happen with the i450NX chipset.
518 if (pci_find_bus(pci_domain_nr(bus), busnr)) {
519 printk(KERN_INFO "PCI: Bus %04x:%02x already known\n",
520 pci_domain_nr(bus), busnr);
524 child = pci_add_new_bus(bus, dev, busnr);
527 child->primary = buses & 0xFF;
528 child->subordinate = (buses >> 16) & 0xFF;
529 child->bridge_ctl = bctl;
531 cmax = pci_scan_child_bus(child);
534 if (child->subordinate > max)
535 max = child->subordinate;
538 * We need to assign a number to this bus which we always
539 * do in the second pass.
542 if (pcibios_assign_all_busses())
543 /* Temporarily disable forwarding of the
544 configuration cycles on all bridges in
545 this bus segment to avoid possible
546 conflicts in the second pass between two
547 bridges programmed with overlapping
549 pci_write_config_dword(dev, PCI_PRIMARY_BUS,
555 pci_write_config_word(dev, PCI_STATUS, 0xffff);
557 /* Prevent assigning a bus number that already exists.
558 * This can happen when a bridge is hot-plugged */
559 if (pci_find_bus(pci_domain_nr(bus), max+1))
561 child = pci_add_new_bus(bus, dev, ++max);
562 buses = (buses & 0xff000000)
563 | ((unsigned int)(child->primary) << 0)
564 | ((unsigned int)(child->secondary) << 8)
565 | ((unsigned int)(child->subordinate) << 16);
568 * yenta.c forces a secondary latency timer of 176.
569 * Copy that behaviour here.
572 buses &= ~0xff000000;
573 buses |= CARDBUS_LATENCY_TIMER << 24;
577 * We need to blast all three values with a single write.
579 pci_write_config_dword(dev, PCI_PRIMARY_BUS, buses);
582 child->bridge_ctl = bctl;
584 * Adjust subordinate busnr in parent buses.
585 * We do this before scanning for children because
586 * some devices may not be detected if the bios
589 pci_fixup_parent_subordinate_busnr(child, max);
590 /* Now we can scan all subordinate buses... */
591 max = pci_scan_child_bus(child);
593 * now fix it up again since we have found
594 * the real value of max.
596 pci_fixup_parent_subordinate_busnr(child, max);
599 * For CardBus bridges, we leave 4 bus numbers
600 * as cards with a PCI-to-PCI bridge can be
603 for (i=0; i<CARDBUS_RESERVE_BUSNR; i++) {
604 struct pci_bus *parent = bus;
605 if (pci_find_bus(pci_domain_nr(bus),
608 while (parent->parent) {
609 if ((!pcibios_assign_all_busses()) &&
610 (parent->subordinate > max) &&
611 (parent->subordinate <= max+i)) {
614 parent = parent->parent;
618 * Often, there are two cardbus bridges
619 * -- try to leave one valid bus number
627 pci_fixup_parent_subordinate_busnr(child, max);
630 * Set the subordinate bus number to its real value.
632 child->subordinate = max;
633 pci_write_config_byte(dev, PCI_SUBORDINATE_BUS, max);
636 sprintf(child->name, (is_cardbus ? "PCI CardBus #%02x" : "PCI Bus #%02x"), child->number);
638 /* Has only triggered on CardBus, fixup is in yenta_socket */
639 while (bus->parent) {
640 if ((child->subordinate > bus->subordinate) ||
641 (child->number > bus->subordinate) ||
642 (child->number < bus->number) ||
643 (child->subordinate < bus->number)) {
644 pr_debug("PCI: Bus #%02x (-#%02x) is %s"
645 "hidden behind%s bridge #%02x (-#%02x)\n",
646 child->number, child->subordinate,
647 (bus->number > child->subordinate &&
648 bus->subordinate < child->number) ?
649 "wholly " : " partially",
650 bus->self->transparent ? " transparent" : " ",
651 bus->number, bus->subordinate);
657 pci_write_config_word(dev, PCI_BRIDGE_CONTROL, bctl);
663 * Read interrupt line and base address registers.
664 * The architecture-dependent code can tweak these, of course.
666 static void pci_read_irq(struct pci_dev *dev)
670 pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &irq);
673 pci_read_config_byte(dev, PCI_INTERRUPT_LINE, &irq);
677 #define LEGACY_IO_RESOURCE (IORESOURCE_IO | IORESOURCE_PCI_FIXED)
680 * pci_setup_device - fill in class and map information of a device
681 * @dev: the device structure to fill
683 * Initialize the device structure with information about the device's
684 * vendor,class,memory and IO-space addresses,IRQ lines etc.
685 * Called at initialisation of the PCI subsystem and by CardBus services.
686 * Returns 0 on success and -1 if unknown type of device (not normal, bridge
689 static int pci_setup_device(struct pci_dev * dev)
693 sprintf(pci_name(dev), "%04x:%02x:%02x.%d", pci_domain_nr(dev->bus),
694 dev->bus->number, PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn));
696 pci_read_config_dword(dev, PCI_CLASS_REVISION, &class);
697 dev->revision = class & 0xff;
698 class >>= 8; /* upper 3 bytes */
702 pr_debug("PCI: Found %s [%04x/%04x] %06x %02x\n", pci_name(dev),
703 dev->vendor, dev->device, class, dev->hdr_type);
705 /* "Unknown power state" */
706 dev->current_state = PCI_UNKNOWN;
708 /* Early fixups, before probing the BARs */
709 pci_fixup_device(pci_fixup_early, dev);
710 class = dev->class >> 8;
712 switch (dev->hdr_type) { /* header type */
713 case PCI_HEADER_TYPE_NORMAL: /* standard header */
714 if (class == PCI_CLASS_BRIDGE_PCI)
717 pci_read_bases(dev, 6, PCI_ROM_ADDRESS);
718 pci_read_config_word(dev, PCI_SUBSYSTEM_VENDOR_ID, &dev->subsystem_vendor);
719 pci_read_config_word(dev, PCI_SUBSYSTEM_ID, &dev->subsystem_device);
722 * Do the ugly legacy mode stuff here rather than broken chip
723 * quirk code. Legacy mode ATA controllers have fixed
724 * addresses. These are not always echoed in BAR0-3, and
725 * BAR0-3 in a few cases contain junk!
727 if (class == PCI_CLASS_STORAGE_IDE) {
729 pci_read_config_byte(dev, PCI_CLASS_PROG, &progif);
730 if ((progif & 1) == 0) {
731 dev->resource[0].start = 0x1F0;
732 dev->resource[0].end = 0x1F7;
733 dev->resource[0].flags = LEGACY_IO_RESOURCE;
734 dev->resource[1].start = 0x3F6;
735 dev->resource[1].end = 0x3F6;
736 dev->resource[1].flags = LEGACY_IO_RESOURCE;
738 if ((progif & 4) == 0) {
739 dev->resource[2].start = 0x170;
740 dev->resource[2].end = 0x177;
741 dev->resource[2].flags = LEGACY_IO_RESOURCE;
742 dev->resource[3].start = 0x376;
743 dev->resource[3].end = 0x376;
744 dev->resource[3].flags = LEGACY_IO_RESOURCE;
749 case PCI_HEADER_TYPE_BRIDGE: /* bridge header */
750 if (class != PCI_CLASS_BRIDGE_PCI)
752 /* The PCI-to-PCI bridge spec requires that subtractive
753 decoding (i.e. transparent) bridge must have programming
754 interface code of 0x01. */
756 dev->transparent = ((dev->class & 0xff) == 1);
757 pci_read_bases(dev, 2, PCI_ROM_ADDRESS1);
760 case PCI_HEADER_TYPE_CARDBUS: /* CardBus bridge header */
761 if (class != PCI_CLASS_BRIDGE_CARDBUS)
764 pci_read_bases(dev, 1, 0);
765 pci_read_config_word(dev, PCI_CB_SUBSYSTEM_VENDOR_ID, &dev->subsystem_vendor);
766 pci_read_config_word(dev, PCI_CB_SUBSYSTEM_ID, &dev->subsystem_device);
769 default: /* unknown header */
770 printk(KERN_ERR "PCI: device %s has unknown header type %02x, ignoring.\n",
771 pci_name(dev), dev->hdr_type);
775 printk(KERN_ERR "PCI: %s: class %x doesn't match header type %02x. Ignoring class.\n",
776 pci_name(dev), class, dev->hdr_type);
777 dev->class = PCI_CLASS_NOT_DEFINED;
780 /* We found a fine healthy device, go go go... */
785 * pci_release_dev - free a pci device structure when all users of it are finished.
786 * @dev: device that's been disconnected
788 * Will be called only by the device core when all users of this pci device are
791 static void pci_release_dev(struct device *dev)
793 struct pci_dev *pci_dev;
795 pci_dev = to_pci_dev(dev);
799 static void set_pcie_port_type(struct pci_dev *pdev)
804 pos = pci_find_capability(pdev, PCI_CAP_ID_EXP);
808 pci_read_config_word(pdev, pos + PCI_EXP_FLAGS, ®16);
809 pdev->pcie_type = (reg16 & PCI_EXP_FLAGS_TYPE) >> 4;
813 * pci_cfg_space_size - get the configuration space size of the PCI device.
816 * Regular PCI devices have 256 bytes, but PCI-X 2 and PCI Express devices
817 * have 4096 bytes. Even if the device is capable, that doesn't mean we can
818 * access it. Maybe we don't have a way to generate extended config space
819 * accesses, or the device is behind a reverse Express bridge. So we try
820 * reading the dword at 0x100 which must either be 0 or a valid extended
823 int pci_cfg_space_size(struct pci_dev *dev)
828 pos = pci_find_capability(dev, PCI_CAP_ID_EXP);
830 pos = pci_find_capability(dev, PCI_CAP_ID_PCIX);
834 pci_read_config_dword(dev, pos + PCI_X_STATUS, &status);
835 if (!(status & (PCI_X_STATUS_266MHZ | PCI_X_STATUS_533MHZ)))
839 if (pci_read_config_dword(dev, 256, &status) != PCIBIOS_SUCCESSFUL)
841 if (status == 0xffffffff)
844 return PCI_CFG_SPACE_EXP_SIZE;
847 return PCI_CFG_SPACE_SIZE;
850 static void pci_release_bus_bridge_dev(struct device *dev)
855 struct pci_dev *alloc_pci_dev(void)
859 dev = kzalloc(sizeof(struct pci_dev), GFP_KERNEL);
863 INIT_LIST_HEAD(&dev->global_list);
864 INIT_LIST_HEAD(&dev->bus_list);
866 pci_msi_init_pci_dev(dev);
870 EXPORT_SYMBOL(alloc_pci_dev);
873 * Read the config data for a PCI device, sanity-check it
874 * and fill in the dev structure...
876 static struct pci_dev * __devinit
877 pci_scan_device(struct pci_bus *bus, int devfn)
884 if (pci_bus_read_config_dword(bus, devfn, PCI_VENDOR_ID, &l))
887 /* some broken boards return 0 or ~0 if a slot is empty: */
888 if (l == 0xffffffff || l == 0x00000000 ||
889 l == 0x0000ffff || l == 0xffff0000)
892 /* Configuration request Retry Status */
893 while (l == 0xffff0001) {
896 if (pci_bus_read_config_dword(bus, devfn, PCI_VENDOR_ID, &l))
898 /* Card hasn't responded in 60 seconds? Must be stuck. */
899 if (delay > 60 * 1000) {
900 printk(KERN_WARNING "Device %04x:%02x:%02x.%d not "
901 "responding\n", pci_domain_nr(bus),
902 bus->number, PCI_SLOT(devfn),
908 if (pci_bus_read_config_byte(bus, devfn, PCI_HEADER_TYPE, &hdr_type))
911 dev = alloc_pci_dev();
916 dev->sysdata = bus->sysdata;
917 dev->dev.parent = bus->bridge;
918 dev->dev.bus = &pci_bus_type;
920 dev->hdr_type = hdr_type & 0x7f;
921 dev->multifunction = !!(hdr_type & 0x80);
922 dev->vendor = l & 0xffff;
923 dev->device = (l >> 16) & 0xffff;
924 dev->cfg_size = pci_cfg_space_size(dev);
925 dev->error_state = pci_channel_io_normal;
926 set_pcie_port_type(dev);
928 /* Assume 32-bit PCI; let 64-bit PCI cards (which are far rarer)
929 set this higher, assuming the system even supports it. */
930 dev->dma_mask = 0xffffffff;
931 if (pci_setup_device(dev) < 0) {
939 void pci_device_add(struct pci_dev *dev, struct pci_bus *bus)
941 device_initialize(&dev->dev);
942 dev->dev.release = pci_release_dev;
945 set_dev_node(&dev->dev, pcibus_to_node(bus));
946 dev->dev.dma_mask = &dev->dma_mask;
947 dev->dev.coherent_dma_mask = 0xffffffffull;
949 /* Fix up broken headers */
950 pci_fixup_device(pci_fixup_header, dev);
953 * Add the device to our list of discovered devices
954 * and the bus list for fixup functions, etc.
956 INIT_LIST_HEAD(&dev->global_list);
957 down_write(&pci_bus_sem);
958 list_add_tail(&dev->bus_list, &bus->devices);
959 up_write(&pci_bus_sem);
962 struct pci_dev *pci_scan_single_device(struct pci_bus *bus, int devfn)
966 dev = pci_scan_device(bus, devfn);
970 pci_device_add(dev, bus);
976 * pci_scan_slot - scan a PCI slot on a bus for devices.
977 * @bus: PCI bus to scan
978 * @devfn: slot number to scan (must have zero function.)
980 * Scan a PCI slot on the specified PCI bus for devices, adding
981 * discovered devices to the @bus->devices list. New devices
982 * will have an empty dev->global_list head.
984 int pci_scan_slot(struct pci_bus *bus, int devfn)
989 scan_all_fns = pcibios_scan_all_fns(bus, devfn);
991 for (func = 0; func < 8; func++, devfn++) {
994 dev = pci_scan_single_device(bus, devfn);
999 * If this is a single function device,
1000 * don't scan past the first function.
1002 if (!dev->multifunction) {
1004 dev->multifunction = 1;
1010 if (func == 0 && !scan_all_fns)
1017 unsigned int pci_scan_child_bus(struct pci_bus *bus)
1019 unsigned int devfn, pass, max = bus->secondary;
1020 struct pci_dev *dev;
1022 pr_debug("PCI: Scanning bus %04x:%02x\n", pci_domain_nr(bus), bus->number);
1024 /* Go find them, Rover! */
1025 for (devfn = 0; devfn < 0x100; devfn += 8)
1026 pci_scan_slot(bus, devfn);
1029 * After performing arch-dependent fixup of the bus, look behind
1030 * all PCI-to-PCI bridges on this bus.
1032 pr_debug("PCI: Fixups for bus %04x:%02x\n", pci_domain_nr(bus), bus->number);
1033 pcibios_fixup_bus(bus);
1034 for (pass=0; pass < 2; pass++)
1035 list_for_each_entry(dev, &bus->devices, bus_list) {
1036 if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE ||
1037 dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)
1038 max = pci_scan_bridge(bus, dev, max, pass);
1042 * We've scanned the bus and so we know all about what's on
1043 * the other side of any bridges that may be on this bus plus
1046 * Return how far we've got finding sub-buses.
1048 pr_debug("PCI: Bus scan for %04x:%02x returning with max=%02x\n",
1049 pci_domain_nr(bus), bus->number, max);
1053 unsigned int __devinit pci_do_scan_bus(struct pci_bus *bus)
1057 max = pci_scan_child_bus(bus);
1060 * Make the discovered devices available.
1062 pci_bus_add_devices(bus);
1067 struct pci_bus * pci_create_bus(struct device *parent,
1068 int bus, struct pci_ops *ops, void *sysdata)
1074 b = pci_alloc_bus();
1078 dev = kmalloc(sizeof(*dev), GFP_KERNEL);
1084 b->sysdata = sysdata;
1087 if (pci_find_bus(pci_domain_nr(b), bus)) {
1088 /* If we already got to this bus through a different bridge, ignore it */
1089 pr_debug("PCI: Bus %04x:%02x already known\n", pci_domain_nr(b), bus);
1093 down_write(&pci_bus_sem);
1094 list_add_tail(&b->node, &pci_root_buses);
1095 up_write(&pci_bus_sem);
1097 memset(dev, 0, sizeof(*dev));
1098 dev->parent = parent;
1099 dev->release = pci_release_bus_bridge_dev;
1100 sprintf(dev->bus_id, "pci%04x:%02x", pci_domain_nr(b), bus);
1101 error = device_register(dev);
1104 b->bridge = get_device(dev);
1106 b->class_dev.class = &pcibus_class;
1107 sprintf(b->class_dev.class_id, "%04x:%02x", pci_domain_nr(b), bus);
1108 error = class_device_register(&b->class_dev);
1110 goto class_dev_reg_err;
1111 error = class_device_create_file(&b->class_dev, &class_device_attr_cpuaffinity);
1113 goto class_dev_create_file_err;
1115 /* Create legacy_io and legacy_mem files for this bus */
1116 pci_create_legacy_files(b);
1118 error = sysfs_create_link(&b->class_dev.kobj, &b->bridge->kobj, "bridge");
1120 goto sys_create_link_err;
1122 b->number = b->secondary = bus;
1123 b->resource[0] = &ioport_resource;
1124 b->resource[1] = &iomem_resource;
1128 sys_create_link_err:
1129 class_device_remove_file(&b->class_dev, &class_device_attr_cpuaffinity);
1130 class_dev_create_file_err:
1131 class_device_unregister(&b->class_dev);
1133 device_unregister(dev);
1135 down_write(&pci_bus_sem);
1137 up_write(&pci_bus_sem);
1143 EXPORT_SYMBOL_GPL(pci_create_bus);
1145 struct pci_bus *pci_scan_bus_parented(struct device *parent,
1146 int bus, struct pci_ops *ops, void *sysdata)
1150 b = pci_create_bus(parent, bus, ops, sysdata);
1152 b->subordinate = pci_scan_child_bus(b);
1155 EXPORT_SYMBOL(pci_scan_bus_parented);
1157 #ifdef CONFIG_HOTPLUG
1158 EXPORT_SYMBOL(pci_add_new_bus);
1159 EXPORT_SYMBOL(pci_do_scan_bus);
1160 EXPORT_SYMBOL(pci_scan_slot);
1161 EXPORT_SYMBOL(pci_scan_bridge);
1162 EXPORT_SYMBOL(pci_scan_single_device);
1163 EXPORT_SYMBOL_GPL(pci_scan_child_bus);
1166 static int __init pci_sort_bf_cmp(const struct pci_dev *a, const struct pci_dev *b)
1168 if (pci_domain_nr(a->bus) < pci_domain_nr(b->bus)) return -1;
1169 else if (pci_domain_nr(a->bus) > pci_domain_nr(b->bus)) return 1;
1171 if (a->bus->number < b->bus->number) return -1;
1172 else if (a->bus->number > b->bus->number) return 1;
1174 if (a->devfn < b->devfn) return -1;
1175 else if (a->devfn > b->devfn) return 1;
1181 * Yes, this forcably breaks the klist abstraction temporarily. It
1182 * just wants to sort the klist, not change reference counts and
1183 * take/drop locks rapidly in the process. It does all this while
1184 * holding the lock for the list, so objects can't otherwise be
1185 * added/removed while we're swizzling.
1187 static void __init pci_insertion_sort_klist(struct pci_dev *a, struct list_head *list)
1189 struct list_head *pos;
1190 struct klist_node *n;
1194 list_for_each(pos, list) {
1195 n = container_of(pos, struct klist_node, n_node);
1196 dev = container_of(n, struct device, knode_bus);
1197 b = to_pci_dev(dev);
1198 if (pci_sort_bf_cmp(a, b) <= 0) {
1199 list_move_tail(&a->dev.knode_bus.n_node, &b->dev.knode_bus.n_node);
1203 list_move_tail(&a->dev.knode_bus.n_node, list);
1206 static void __init pci_sort_breadthfirst_klist(void)
1208 LIST_HEAD(sorted_devices);
1209 struct list_head *pos, *tmp;
1210 struct klist_node *n;
1212 struct pci_dev *pdev;
1214 spin_lock(&pci_bus_type.klist_devices.k_lock);
1215 list_for_each_safe(pos, tmp, &pci_bus_type.klist_devices.k_list) {
1216 n = container_of(pos, struct klist_node, n_node);
1217 dev = container_of(n, struct device, knode_bus);
1218 pdev = to_pci_dev(dev);
1219 pci_insertion_sort_klist(pdev, &sorted_devices);
1221 list_splice(&sorted_devices, &pci_bus_type.klist_devices.k_list);
1222 spin_unlock(&pci_bus_type.klist_devices.k_lock);
1225 static void __init pci_insertion_sort_devices(struct pci_dev *a, struct list_head *list)
1229 list_for_each_entry(b, list, global_list) {
1230 if (pci_sort_bf_cmp(a, b) <= 0) {
1231 list_move_tail(&a->global_list, &b->global_list);
1235 list_move_tail(&a->global_list, list);
1238 static void __init pci_sort_breadthfirst_devices(void)
1240 LIST_HEAD(sorted_devices);
1241 struct pci_dev *dev, *tmp;
1243 down_write(&pci_bus_sem);
1244 list_for_each_entry_safe(dev, tmp, &pci_devices, global_list) {
1245 pci_insertion_sort_devices(dev, &sorted_devices);
1247 list_splice(&sorted_devices, &pci_devices);
1248 up_write(&pci_bus_sem);
1251 void __init pci_sort_breadthfirst(void)
1253 pci_sort_breadthfirst_devices();
1254 pci_sort_breadthfirst_klist();