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;
167 * Find the extent of a PCI decode..
169 static u32 pci_size(u32 base, u32 maxbase, u32 mask)
171 u32 size = mask & maxbase; /* Find the significant bits */
175 /* Get the lowest of them to find the decode size, and
176 from that the extent. */
177 size = (size & ~(size-1)) - 1;
179 /* base == maxbase can be valid only if the BAR has
180 already been programmed with all 1s. */
181 if (base == maxbase && ((base | size) & mask) != mask)
187 static u64 pci_size64(u64 base, u64 maxbase, u64 mask)
189 u64 size = mask & maxbase; /* Find the significant bits */
193 /* Get the lowest of them to find the decode size, and
194 from that the extent. */
195 size = (size & ~(size-1)) - 1;
197 /* base == maxbase can be valid only if the BAR has
198 already been programmed with all 1s. */
199 if (base == maxbase && ((base | size) & mask) != mask)
205 static inline int is_64bit_memory(u32 mask)
207 if ((mask & (PCI_BASE_ADDRESS_SPACE|PCI_BASE_ADDRESS_MEM_TYPE_MASK)) ==
208 (PCI_BASE_ADDRESS_SPACE_MEMORY|PCI_BASE_ADDRESS_MEM_TYPE_64))
213 static void pci_read_bases(struct pci_dev *dev, unsigned int howmany, int rom)
215 unsigned int pos, reg, next;
217 struct resource *res;
219 for(pos=0; pos<howmany; pos = next) {
225 res = &dev->resource[pos];
226 res->name = pci_name(dev);
227 reg = PCI_BASE_ADDRESS_0 + (pos << 2);
228 pci_read_config_dword(dev, reg, &l);
229 pci_write_config_dword(dev, reg, ~0);
230 pci_read_config_dword(dev, reg, &sz);
231 pci_write_config_dword(dev, reg, l);
232 if (!sz || sz == 0xffffffff)
237 if ((l & PCI_BASE_ADDRESS_SPACE) ==
238 PCI_BASE_ADDRESS_SPACE_MEMORY) {
239 sz = pci_size(l, sz, (u32)PCI_BASE_ADDRESS_MEM_MASK);
241 * For 64bit prefetchable memory sz could be 0, if the
242 * real size is bigger than 4G, so we need to check
245 if (!is_64bit_memory(l) && !sz)
247 res->start = l & PCI_BASE_ADDRESS_MEM_MASK;
248 res->flags |= l & ~PCI_BASE_ADDRESS_MEM_MASK;
250 sz = pci_size(l, sz, PCI_BASE_ADDRESS_IO_MASK & 0xffff);
253 res->start = l & PCI_BASE_ADDRESS_IO_MASK;
254 res->flags |= l & ~PCI_BASE_ADDRESS_IO_MASK;
256 res->end = res->start + (unsigned long) sz;
257 res->flags |= pci_calc_resource_flags(l) | IORESOURCE_SIZEALIGN;
258 if (is_64bit_memory(l)) {
261 pci_read_config_dword(dev, reg+4, &lhi);
262 pci_write_config_dword(dev, reg+4, ~0);
263 pci_read_config_dword(dev, reg+4, &szhi);
264 pci_write_config_dword(dev, reg+4, lhi);
265 sz64 = ((u64)szhi << 32) | raw_sz;
266 l64 = ((u64)lhi << 32) | l;
267 sz64 = pci_size64(l64, sz64, PCI_BASE_ADDRESS_MEM_MASK);
269 #if BITS_PER_LONG == 64
276 res->start = l64 & PCI_BASE_ADDRESS_MEM_MASK;
277 res->end = res->start + sz64;
279 if (sz64 > 0x100000000ULL) {
280 printk(KERN_ERR "PCI: Unable to handle 64-bit "
281 "BAR for device %s\n", pci_name(dev));
285 /* 64-bit wide address, treat as disabled */
286 pci_write_config_dword(dev, reg,
287 l & ~(u32)PCI_BASE_ADDRESS_MEM_MASK);
288 pci_write_config_dword(dev, reg+4, 0);
296 dev->rom_base_reg = rom;
297 res = &dev->resource[PCI_ROM_RESOURCE];
298 res->name = pci_name(dev);
299 pci_read_config_dword(dev, rom, &l);
300 pci_write_config_dword(dev, rom, ~PCI_ROM_ADDRESS_ENABLE);
301 pci_read_config_dword(dev, rom, &sz);
302 pci_write_config_dword(dev, rom, l);
305 if (sz && sz != 0xffffffff) {
306 sz = pci_size(l, sz, (u32)PCI_ROM_ADDRESS_MASK);
308 res->flags = (l & IORESOURCE_ROM_ENABLE) |
309 IORESOURCE_MEM | IORESOURCE_PREFETCH |
310 IORESOURCE_READONLY | IORESOURCE_CACHEABLE |
311 IORESOURCE_SIZEALIGN;
312 res->start = l & PCI_ROM_ADDRESS_MASK;
313 res->end = res->start + (unsigned long) sz;
319 void __devinit pci_read_bridge_bases(struct pci_bus *child)
321 struct pci_dev *dev = child->self;
322 u8 io_base_lo, io_limit_lo;
323 u16 mem_base_lo, mem_limit_lo;
324 unsigned long base, limit;
325 struct resource *res;
328 if (!dev) /* It's a host bus, nothing to read */
331 if (dev->transparent) {
332 printk(KERN_INFO "PCI: Transparent bridge - %s\n", pci_name(dev));
333 for(i = 3; i < PCI_BUS_NUM_RESOURCES; i++)
334 child->resource[i] = child->parent->resource[i - 3];
338 child->resource[i] = &dev->resource[PCI_BRIDGE_RESOURCES+i];
340 res = child->resource[0];
341 pci_read_config_byte(dev, PCI_IO_BASE, &io_base_lo);
342 pci_read_config_byte(dev, PCI_IO_LIMIT, &io_limit_lo);
343 base = (io_base_lo & PCI_IO_RANGE_MASK) << 8;
344 limit = (io_limit_lo & PCI_IO_RANGE_MASK) << 8;
346 if ((io_base_lo & PCI_IO_RANGE_TYPE_MASK) == PCI_IO_RANGE_TYPE_32) {
347 u16 io_base_hi, io_limit_hi;
348 pci_read_config_word(dev, PCI_IO_BASE_UPPER16, &io_base_hi);
349 pci_read_config_word(dev, PCI_IO_LIMIT_UPPER16, &io_limit_hi);
350 base |= (io_base_hi << 16);
351 limit |= (io_limit_hi << 16);
355 res->flags = (io_base_lo & PCI_IO_RANGE_TYPE_MASK) | IORESOURCE_IO;
359 res->end = limit + 0xfff;
362 res = child->resource[1];
363 pci_read_config_word(dev, PCI_MEMORY_BASE, &mem_base_lo);
364 pci_read_config_word(dev, PCI_MEMORY_LIMIT, &mem_limit_lo);
365 base = (mem_base_lo & PCI_MEMORY_RANGE_MASK) << 16;
366 limit = (mem_limit_lo & PCI_MEMORY_RANGE_MASK) << 16;
368 res->flags = (mem_base_lo & PCI_MEMORY_RANGE_TYPE_MASK) | IORESOURCE_MEM;
370 res->end = limit + 0xfffff;
373 res = child->resource[2];
374 pci_read_config_word(dev, PCI_PREF_MEMORY_BASE, &mem_base_lo);
375 pci_read_config_word(dev, PCI_PREF_MEMORY_LIMIT, &mem_limit_lo);
376 base = (mem_base_lo & PCI_PREF_RANGE_MASK) << 16;
377 limit = (mem_limit_lo & PCI_PREF_RANGE_MASK) << 16;
379 if ((mem_base_lo & PCI_PREF_RANGE_TYPE_MASK) == PCI_PREF_RANGE_TYPE_64) {
380 u32 mem_base_hi, mem_limit_hi;
381 pci_read_config_dword(dev, PCI_PREF_BASE_UPPER32, &mem_base_hi);
382 pci_read_config_dword(dev, PCI_PREF_LIMIT_UPPER32, &mem_limit_hi);
385 * Some bridges set the base > limit by default, and some
386 * (broken) BIOSes do not initialize them. If we find
387 * this, just assume they are not being used.
389 if (mem_base_hi <= mem_limit_hi) {
390 #if BITS_PER_LONG == 64
391 base |= ((long) mem_base_hi) << 32;
392 limit |= ((long) mem_limit_hi) << 32;
394 if (mem_base_hi || mem_limit_hi) {
395 printk(KERN_ERR "PCI: Unable to handle 64-bit address space for bridge %s\n", pci_name(dev));
402 res->flags = (mem_base_lo & PCI_MEMORY_RANGE_TYPE_MASK) | IORESOURCE_MEM | IORESOURCE_PREFETCH;
404 res->end = limit + 0xfffff;
408 static struct pci_bus * pci_alloc_bus(void)
412 b = kzalloc(sizeof(*b), GFP_KERNEL);
414 INIT_LIST_HEAD(&b->node);
415 INIT_LIST_HEAD(&b->children);
416 INIT_LIST_HEAD(&b->devices);
421 static struct pci_bus *pci_alloc_child_bus(struct pci_bus *parent,
422 struct pci_dev *bridge, int busnr)
424 struct pci_bus *child;
428 * Allocate a new bus, and inherit stuff from the parent..
430 child = pci_alloc_bus();
434 child->self = bridge;
435 child->parent = parent;
436 child->ops = parent->ops;
437 child->sysdata = parent->sysdata;
438 child->bus_flags = parent->bus_flags;
439 child->bridge = get_device(&bridge->dev);
441 /* initialize some portions of the bus device, but don't register it
442 * now as the parent is not properly set up yet. This device will get
443 * registered later in pci_bus_add_devices()
445 child->dev.class = &pcibus_class;
446 sprintf(child->dev.bus_id, "%04x:%02x", pci_domain_nr(child), busnr);
449 * Set up the primary, secondary and subordinate
452 child->number = child->secondary = busnr;
453 child->primary = parent->secondary;
454 child->subordinate = 0xff;
456 /* Set up default resource pointers and names.. */
457 for (i = 0; i < 4; i++) {
458 child->resource[i] = &bridge->resource[PCI_BRIDGE_RESOURCES+i];
459 child->resource[i]->name = child->name;
461 bridge->subordinate = child;
466 struct pci_bus *__ref pci_add_new_bus(struct pci_bus *parent, struct pci_dev *dev, int busnr)
468 struct pci_bus *child;
470 child = pci_alloc_child_bus(parent, dev, busnr);
472 down_write(&pci_bus_sem);
473 list_add_tail(&child->node, &parent->children);
474 up_write(&pci_bus_sem);
479 static void pci_fixup_parent_subordinate_busnr(struct pci_bus *child, int max)
481 struct pci_bus *parent = child->parent;
483 /* Attempts to fix that up are really dangerous unless
484 we're going to re-assign all bus numbers. */
485 if (!pcibios_assign_all_busses())
488 while (parent->parent && parent->subordinate < max) {
489 parent->subordinate = max;
490 pci_write_config_byte(parent->self, PCI_SUBORDINATE_BUS, max);
491 parent = parent->parent;
496 * If it's a bridge, configure it and scan the bus behind it.
497 * For CardBus bridges, we don't scan behind as the devices will
498 * be handled by the bridge driver itself.
500 * We need to process bridges in two passes -- first we scan those
501 * already configured by the BIOS and after we are done with all of
502 * them, we proceed to assigning numbers to the remaining buses in
503 * order to avoid overlaps between old and new bus numbers.
505 int __devinit pci_scan_bridge(struct pci_bus *bus, struct pci_dev *dev, int max, int pass)
507 struct pci_bus *child;
508 int is_cardbus = (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS);
512 pci_read_config_dword(dev, PCI_PRIMARY_BUS, &buses);
514 pr_debug("PCI: Scanning behind PCI bridge %s, config %06x, pass %d\n",
515 pci_name(dev), buses & 0xffffff, pass);
517 /* Disable MasterAbortMode during probing to avoid reporting
518 of bus errors (in some architectures) */
519 pci_read_config_word(dev, PCI_BRIDGE_CONTROL, &bctl);
520 pci_write_config_word(dev, PCI_BRIDGE_CONTROL,
521 bctl & ~PCI_BRIDGE_CTL_MASTER_ABORT);
523 if ((buses & 0xffff00) && !pcibios_assign_all_busses() && !is_cardbus) {
524 unsigned int cmax, busnr;
526 * Bus already configured by firmware, process it in the first
527 * pass and just note the configuration.
531 busnr = (buses >> 8) & 0xFF;
534 * If we already got to this bus through a different bridge,
535 * ignore it. This can happen with the i450NX chipset.
537 if (pci_find_bus(pci_domain_nr(bus), busnr)) {
538 printk(KERN_INFO "PCI: Bus %04x:%02x already known\n",
539 pci_domain_nr(bus), busnr);
543 child = pci_add_new_bus(bus, dev, busnr);
546 child->primary = buses & 0xFF;
547 child->subordinate = (buses >> 16) & 0xFF;
548 child->bridge_ctl = bctl;
550 cmax = pci_scan_child_bus(child);
553 if (child->subordinate > max)
554 max = child->subordinate;
557 * We need to assign a number to this bus which we always
558 * do in the second pass.
561 if (pcibios_assign_all_busses())
562 /* Temporarily disable forwarding of the
563 configuration cycles on all bridges in
564 this bus segment to avoid possible
565 conflicts in the second pass between two
566 bridges programmed with overlapping
568 pci_write_config_dword(dev, PCI_PRIMARY_BUS,
574 pci_write_config_word(dev, PCI_STATUS, 0xffff);
576 /* Prevent assigning a bus number that already exists.
577 * This can happen when a bridge is hot-plugged */
578 if (pci_find_bus(pci_domain_nr(bus), max+1))
580 child = pci_add_new_bus(bus, dev, ++max);
581 buses = (buses & 0xff000000)
582 | ((unsigned int)(child->primary) << 0)
583 | ((unsigned int)(child->secondary) << 8)
584 | ((unsigned int)(child->subordinate) << 16);
587 * yenta.c forces a secondary latency timer of 176.
588 * Copy that behaviour here.
591 buses &= ~0xff000000;
592 buses |= CARDBUS_LATENCY_TIMER << 24;
596 * We need to blast all three values with a single write.
598 pci_write_config_dword(dev, PCI_PRIMARY_BUS, buses);
601 child->bridge_ctl = bctl;
603 * Adjust subordinate busnr in parent buses.
604 * We do this before scanning for children because
605 * some devices may not be detected if the bios
608 pci_fixup_parent_subordinate_busnr(child, max);
609 /* Now we can scan all subordinate buses... */
610 max = pci_scan_child_bus(child);
612 * now fix it up again since we have found
613 * the real value of max.
615 pci_fixup_parent_subordinate_busnr(child, max);
618 * For CardBus bridges, we leave 4 bus numbers
619 * as cards with a PCI-to-PCI bridge can be
622 for (i=0; i<CARDBUS_RESERVE_BUSNR; i++) {
623 struct pci_bus *parent = bus;
624 if (pci_find_bus(pci_domain_nr(bus),
627 while (parent->parent) {
628 if ((!pcibios_assign_all_busses()) &&
629 (parent->subordinate > max) &&
630 (parent->subordinate <= max+i)) {
633 parent = parent->parent;
637 * Often, there are two cardbus bridges
638 * -- try to leave one valid bus number
646 pci_fixup_parent_subordinate_busnr(child, max);
649 * Set the subordinate bus number to its real value.
651 child->subordinate = max;
652 pci_write_config_byte(dev, PCI_SUBORDINATE_BUS, max);
656 (is_cardbus ? "PCI CardBus %04x:%02x" : "PCI Bus %04x:%02x"),
657 pci_domain_nr(bus), child->number);
659 /* Has only triggered on CardBus, fixup is in yenta_socket */
660 while (bus->parent) {
661 if ((child->subordinate > bus->subordinate) ||
662 (child->number > bus->subordinate) ||
663 (child->number < bus->number) ||
664 (child->subordinate < bus->number)) {
665 pr_debug("PCI: Bus #%02x (-#%02x) is %s "
666 "hidden behind%s bridge #%02x (-#%02x)\n",
667 child->number, child->subordinate,
668 (bus->number > child->subordinate &&
669 bus->subordinate < child->number) ?
670 "wholly" : "partially",
671 bus->self->transparent ? " transparent" : "",
672 bus->number, bus->subordinate);
678 pci_write_config_word(dev, PCI_BRIDGE_CONTROL, bctl);
684 * Read interrupt line and base address registers.
685 * The architecture-dependent code can tweak these, of course.
687 static void pci_read_irq(struct pci_dev *dev)
691 pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &irq);
694 pci_read_config_byte(dev, PCI_INTERRUPT_LINE, &irq);
698 #define LEGACY_IO_RESOURCE (IORESOURCE_IO | IORESOURCE_PCI_FIXED)
701 * pci_setup_device - fill in class and map information of a device
702 * @dev: the device structure to fill
704 * Initialize the device structure with information about the device's
705 * vendor,class,memory and IO-space addresses,IRQ lines etc.
706 * Called at initialisation of the PCI subsystem and by CardBus services.
707 * Returns 0 on success and -1 if unknown type of device (not normal, bridge
710 static int pci_setup_device(struct pci_dev * dev)
714 sprintf(pci_name(dev), "%04x:%02x:%02x.%d", pci_domain_nr(dev->bus),
715 dev->bus->number, PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn));
717 pci_read_config_dword(dev, PCI_CLASS_REVISION, &class);
718 dev->revision = class & 0xff;
719 class >>= 8; /* upper 3 bytes */
723 pr_debug("PCI: Found %s [%04x/%04x] %06x %02x\n", pci_name(dev),
724 dev->vendor, dev->device, class, dev->hdr_type);
726 /* "Unknown power state" */
727 dev->current_state = PCI_UNKNOWN;
729 /* Early fixups, before probing the BARs */
730 pci_fixup_device(pci_fixup_early, dev);
731 class = dev->class >> 8;
733 switch (dev->hdr_type) { /* header type */
734 case PCI_HEADER_TYPE_NORMAL: /* standard header */
735 if (class == PCI_CLASS_BRIDGE_PCI)
738 pci_read_bases(dev, 6, PCI_ROM_ADDRESS);
739 pci_read_config_word(dev, PCI_SUBSYSTEM_VENDOR_ID, &dev->subsystem_vendor);
740 pci_read_config_word(dev, PCI_SUBSYSTEM_ID, &dev->subsystem_device);
743 * Do the ugly legacy mode stuff here rather than broken chip
744 * quirk code. Legacy mode ATA controllers have fixed
745 * addresses. These are not always echoed in BAR0-3, and
746 * BAR0-3 in a few cases contain junk!
748 if (class == PCI_CLASS_STORAGE_IDE) {
750 pci_read_config_byte(dev, PCI_CLASS_PROG, &progif);
751 if ((progif & 1) == 0) {
752 dev->resource[0].start = 0x1F0;
753 dev->resource[0].end = 0x1F7;
754 dev->resource[0].flags = LEGACY_IO_RESOURCE;
755 dev->resource[1].start = 0x3F6;
756 dev->resource[1].end = 0x3F6;
757 dev->resource[1].flags = LEGACY_IO_RESOURCE;
759 if ((progif & 4) == 0) {
760 dev->resource[2].start = 0x170;
761 dev->resource[2].end = 0x177;
762 dev->resource[2].flags = LEGACY_IO_RESOURCE;
763 dev->resource[3].start = 0x376;
764 dev->resource[3].end = 0x376;
765 dev->resource[3].flags = LEGACY_IO_RESOURCE;
770 case PCI_HEADER_TYPE_BRIDGE: /* bridge header */
771 if (class != PCI_CLASS_BRIDGE_PCI)
773 /* The PCI-to-PCI bridge spec requires that subtractive
774 decoding (i.e. transparent) bridge must have programming
775 interface code of 0x01. */
777 dev->transparent = ((dev->class & 0xff) == 1);
778 pci_read_bases(dev, 2, PCI_ROM_ADDRESS1);
781 case PCI_HEADER_TYPE_CARDBUS: /* CardBus bridge header */
782 if (class != PCI_CLASS_BRIDGE_CARDBUS)
785 pci_read_bases(dev, 1, 0);
786 pci_read_config_word(dev, PCI_CB_SUBSYSTEM_VENDOR_ID, &dev->subsystem_vendor);
787 pci_read_config_word(dev, PCI_CB_SUBSYSTEM_ID, &dev->subsystem_device);
790 default: /* unknown header */
791 printk(KERN_ERR "PCI: device %s has unknown header type %02x, ignoring.\n",
792 pci_name(dev), dev->hdr_type);
796 printk(KERN_ERR "PCI: %s: class %x doesn't match header type %02x. Ignoring class.\n",
797 pci_name(dev), class, dev->hdr_type);
798 dev->class = PCI_CLASS_NOT_DEFINED;
801 /* We found a fine healthy device, go go go... */
806 * pci_release_dev - free a pci device structure when all users of it are finished.
807 * @dev: device that's been disconnected
809 * Will be called only by the device core when all users of this pci device are
812 static void pci_release_dev(struct device *dev)
814 struct pci_dev *pci_dev;
816 pci_dev = to_pci_dev(dev);
817 pci_vpd_release(pci_dev);
821 static void set_pcie_port_type(struct pci_dev *pdev)
826 pos = pci_find_capability(pdev, PCI_CAP_ID_EXP);
830 pci_read_config_word(pdev, pos + PCI_EXP_FLAGS, ®16);
831 pdev->pcie_type = (reg16 & PCI_EXP_FLAGS_TYPE) >> 4;
835 * pci_cfg_space_size - get the configuration space size of the PCI device.
838 * Regular PCI devices have 256 bytes, but PCI-X 2 and PCI Express devices
839 * have 4096 bytes. Even if the device is capable, that doesn't mean we can
840 * access it. Maybe we don't have a way to generate extended config space
841 * accesses, or the device is behind a reverse Express bridge. So we try
842 * reading the dword at 0x100 which must either be 0 or a valid extended
845 int pci_cfg_space_size_ext(struct pci_dev *dev)
849 if (pci_read_config_dword(dev, 256, &status) != PCIBIOS_SUCCESSFUL)
851 if (status == 0xffffffff)
854 return PCI_CFG_SPACE_EXP_SIZE;
857 return PCI_CFG_SPACE_SIZE;
861 * pci_disable_pme - Disable the PME function of PCI device
862 * @dev: PCI device affected
863 * -EINVAL is returned if PCI device doesn't support PME.
864 * Zero is returned if the PME is supported and can be disabled.
866 static int pci_disable_pme(struct pci_dev *dev)
871 /* find PCI PM capability in list */
872 pm = pci_find_capability(dev, PCI_CAP_ID_PM);
874 /* If device doesn't support PM Capabilities, it means that PME is
879 /* Check device's ability to generate PME# */
880 pci_read_config_word(dev, pm + PCI_PM_PMC, &value);
882 value &= PCI_PM_CAP_PME_MASK;
883 /* Check if it can generate PME# */
886 * If it is zero, it means that PME is still unsupported
887 * although there exists the PM capability.
892 pci_read_config_word(dev, pm + PCI_PM_CTRL, &value);
894 /* Clear PME_Status by writing 1 to it */
895 value |= PCI_PM_CTRL_PME_STATUS ;
896 /* Disable PME enable bit */
897 value &= ~PCI_PM_CTRL_PME_ENABLE;
898 pci_write_config_word(dev, pm + PCI_PM_CTRL, value);
903 int pci_cfg_space_size(struct pci_dev *dev)
908 pos = pci_find_capability(dev, PCI_CAP_ID_EXP);
910 pos = pci_find_capability(dev, PCI_CAP_ID_PCIX);
914 pci_read_config_dword(dev, pos + PCI_X_STATUS, &status);
915 if (!(status & (PCI_X_STATUS_266MHZ | PCI_X_STATUS_533MHZ)))
919 return pci_cfg_space_size_ext(dev);
922 return PCI_CFG_SPACE_SIZE;
925 static void pci_release_bus_bridge_dev(struct device *dev)
930 struct pci_dev *alloc_pci_dev(void)
934 dev = kzalloc(sizeof(struct pci_dev), GFP_KERNEL);
938 INIT_LIST_HEAD(&dev->bus_list);
940 pci_msi_init_pci_dev(dev);
944 EXPORT_SYMBOL(alloc_pci_dev);
947 * Read the config data for a PCI device, sanity-check it
948 * and fill in the dev structure...
950 static struct pci_dev *pci_scan_device(struct pci_bus *bus, int devfn)
957 if (pci_bus_read_config_dword(bus, devfn, PCI_VENDOR_ID, &l))
960 /* some broken boards return 0 or ~0 if a slot is empty: */
961 if (l == 0xffffffff || l == 0x00000000 ||
962 l == 0x0000ffff || l == 0xffff0000)
965 /* Configuration request Retry Status */
966 while (l == 0xffff0001) {
969 if (pci_bus_read_config_dword(bus, devfn, PCI_VENDOR_ID, &l))
971 /* Card hasn't responded in 60 seconds? Must be stuck. */
972 if (delay > 60 * 1000) {
973 printk(KERN_WARNING "Device %04x:%02x:%02x.%d not "
974 "responding\n", pci_domain_nr(bus),
975 bus->number, PCI_SLOT(devfn),
981 if (pci_bus_read_config_byte(bus, devfn, PCI_HEADER_TYPE, &hdr_type))
984 dev = alloc_pci_dev();
989 dev->sysdata = bus->sysdata;
990 dev->dev.parent = bus->bridge;
991 dev->dev.bus = &pci_bus_type;
993 dev->hdr_type = hdr_type & 0x7f;
994 dev->multifunction = !!(hdr_type & 0x80);
995 dev->vendor = l & 0xffff;
996 dev->device = (l >> 16) & 0xffff;
997 dev->cfg_size = pci_cfg_space_size(dev);
998 dev->error_state = pci_channel_io_normal;
999 set_pcie_port_type(dev);
1001 /* Assume 32-bit PCI; let 64-bit PCI cards (which are far rarer)
1002 set this higher, assuming the system even supports it. */
1003 dev->dma_mask = 0xffffffff;
1004 if (pci_setup_device(dev) < 0) {
1009 pci_vpd_pci22_init(dev);
1010 pci_disable_pme(dev);
1015 void pci_device_add(struct pci_dev *dev, struct pci_bus *bus)
1017 device_initialize(&dev->dev);
1018 dev->dev.release = pci_release_dev;
1021 dev->dev.dma_mask = &dev->dma_mask;
1022 dev->dev.dma_parms = &dev->dma_parms;
1023 dev->dev.coherent_dma_mask = 0xffffffffull;
1025 pci_set_dma_max_seg_size(dev, 65536);
1026 pci_set_dma_seg_boundary(dev, 0xffffffff);
1028 /* Fix up broken headers */
1029 pci_fixup_device(pci_fixup_header, dev);
1032 * Add the device to our list of discovered devices
1033 * and the bus list for fixup functions, etc.
1035 down_write(&pci_bus_sem);
1036 list_add_tail(&dev->bus_list, &bus->devices);
1037 up_write(&pci_bus_sem);
1040 struct pci_dev *__ref pci_scan_single_device(struct pci_bus *bus, int devfn)
1042 struct pci_dev *dev;
1044 dev = pci_scan_device(bus, devfn);
1048 pci_device_add(dev, bus);
1052 EXPORT_SYMBOL(pci_scan_single_device);
1055 * pci_scan_slot - scan a PCI slot on a bus for devices.
1056 * @bus: PCI bus to scan
1057 * @devfn: slot number to scan (must have zero function.)
1059 * Scan a PCI slot on the specified PCI bus for devices, adding
1060 * discovered devices to the @bus->devices list. New devices
1061 * will not have is_added set.
1063 int pci_scan_slot(struct pci_bus *bus, int devfn)
1068 scan_all_fns = pcibios_scan_all_fns(bus, devfn);
1070 for (func = 0; func < 8; func++, devfn++) {
1071 struct pci_dev *dev;
1073 dev = pci_scan_single_device(bus, devfn);
1078 * If this is a single function device,
1079 * don't scan past the first function.
1081 if (!dev->multifunction) {
1083 dev->multifunction = 1;
1089 if (func == 0 && !scan_all_fns)
1095 pcie_aspm_init_link_state(bus->self);
1100 unsigned int __devinit pci_scan_child_bus(struct pci_bus *bus)
1102 unsigned int devfn, pass, max = bus->secondary;
1103 struct pci_dev *dev;
1105 pr_debug("PCI: Scanning bus %04x:%02x\n", pci_domain_nr(bus), bus->number);
1107 /* Go find them, Rover! */
1108 for (devfn = 0; devfn < 0x100; devfn += 8)
1109 pci_scan_slot(bus, devfn);
1112 * After performing arch-dependent fixup of the bus, look behind
1113 * all PCI-to-PCI bridges on this bus.
1115 pr_debug("PCI: Fixups for bus %04x:%02x\n", pci_domain_nr(bus), bus->number);
1116 pcibios_fixup_bus(bus);
1117 for (pass=0; pass < 2; pass++)
1118 list_for_each_entry(dev, &bus->devices, bus_list) {
1119 if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE ||
1120 dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)
1121 max = pci_scan_bridge(bus, dev, max, pass);
1125 * We've scanned the bus and so we know all about what's on
1126 * the other side of any bridges that may be on this bus plus
1129 * Return how far we've got finding sub-buses.
1131 pr_debug("PCI: Bus scan for %04x:%02x returning with max=%02x\n",
1132 pci_domain_nr(bus), bus->number, max);
1136 void __attribute__((weak)) set_pci_bus_resources_arch_default(struct pci_bus *b)
1140 struct pci_bus * pci_create_bus(struct device *parent,
1141 int bus, struct pci_ops *ops, void *sysdata)
1147 b = pci_alloc_bus();
1151 dev = kmalloc(sizeof(*dev), GFP_KERNEL);
1157 b->sysdata = sysdata;
1160 if (pci_find_bus(pci_domain_nr(b), bus)) {
1161 /* If we already got to this bus through a different bridge, ignore it */
1162 pr_debug("PCI: Bus %04x:%02x already known\n", pci_domain_nr(b), bus);
1166 down_write(&pci_bus_sem);
1167 list_add_tail(&b->node, &pci_root_buses);
1168 up_write(&pci_bus_sem);
1170 memset(dev, 0, sizeof(*dev));
1171 dev->parent = parent;
1172 dev->release = pci_release_bus_bridge_dev;
1173 sprintf(dev->bus_id, "pci%04x:%02x", pci_domain_nr(b), bus);
1174 error = device_register(dev);
1177 b->bridge = get_device(dev);
1180 set_dev_node(b->bridge, pcibus_to_node(b));
1182 b->dev.class = &pcibus_class;
1183 b->dev.parent = b->bridge;
1184 sprintf(b->dev.bus_id, "%04x:%02x", pci_domain_nr(b), bus);
1185 error = device_register(&b->dev);
1187 goto class_dev_reg_err;
1188 error = device_create_file(&b->dev, &dev_attr_cpuaffinity);
1190 goto dev_create_file_err;
1192 /* Create legacy_io and legacy_mem files for this bus */
1193 pci_create_legacy_files(b);
1195 b->number = b->secondary = bus;
1196 b->resource[0] = &ioport_resource;
1197 b->resource[1] = &iomem_resource;
1199 set_pci_bus_resources_arch_default(b);
1203 dev_create_file_err:
1204 device_unregister(&b->dev);
1206 device_unregister(dev);
1208 down_write(&pci_bus_sem);
1210 up_write(&pci_bus_sem);
1217 struct pci_bus * __devinit pci_scan_bus_parented(struct device *parent,
1218 int bus, struct pci_ops *ops, void *sysdata)
1222 b = pci_create_bus(parent, bus, ops, sysdata);
1224 b->subordinate = pci_scan_child_bus(b);
1227 EXPORT_SYMBOL(pci_scan_bus_parented);
1229 #ifdef CONFIG_HOTPLUG
1230 EXPORT_SYMBOL(pci_add_new_bus);
1231 EXPORT_SYMBOL(pci_scan_slot);
1232 EXPORT_SYMBOL(pci_scan_bridge);
1233 EXPORT_SYMBOL_GPL(pci_scan_child_bus);
1236 static int __init pci_sort_bf_cmp(const struct pci_dev *a, const struct pci_dev *b)
1238 if (pci_domain_nr(a->bus) < pci_domain_nr(b->bus)) return -1;
1239 else if (pci_domain_nr(a->bus) > pci_domain_nr(b->bus)) return 1;
1241 if (a->bus->number < b->bus->number) return -1;
1242 else if (a->bus->number > b->bus->number) return 1;
1244 if (a->devfn < b->devfn) return -1;
1245 else if (a->devfn > b->devfn) return 1;
1251 * Yes, this forcably breaks the klist abstraction temporarily. It
1252 * just wants to sort the klist, not change reference counts and
1253 * take/drop locks rapidly in the process. It does all this while
1254 * holding the lock for the list, so objects can't otherwise be
1255 * added/removed while we're swizzling.
1257 static void __init pci_insertion_sort_klist(struct pci_dev *a, struct list_head *list)
1259 struct list_head *pos;
1260 struct klist_node *n;
1264 list_for_each(pos, list) {
1265 n = container_of(pos, struct klist_node, n_node);
1266 dev = container_of(n, struct device, knode_bus);
1267 b = to_pci_dev(dev);
1268 if (pci_sort_bf_cmp(a, b) <= 0) {
1269 list_move_tail(&a->dev.knode_bus.n_node, &b->dev.knode_bus.n_node);
1273 list_move_tail(&a->dev.knode_bus.n_node, list);
1276 void __init pci_sort_breadthfirst(void)
1278 LIST_HEAD(sorted_devices);
1279 struct list_head *pos, *tmp;
1280 struct klist_node *n;
1282 struct pci_dev *pdev;
1283 struct klist *device_klist;
1285 device_klist = bus_get_device_klist(&pci_bus_type);
1287 spin_lock(&device_klist->k_lock);
1288 list_for_each_safe(pos, tmp, &device_klist->k_list) {
1289 n = container_of(pos, struct klist_node, n_node);
1290 dev = container_of(n, struct device, knode_bus);
1291 pdev = to_pci_dev(dev);
1292 pci_insertion_sort_klist(pdev, &sorted_devices);
1294 list_splice(&sorted_devices, &device_klist->k_list);
1295 spin_unlock(&device_klist->k_lock);