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 dev_err(&dev->dev, "BAR %d: can't handle 64-bit"
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 dev_info(&dev->dev, "transparent bridge\n");
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 dev_err(&dev->dev, "can't handle 64-bit "
396 "address space for bridge\n");
403 res->flags = (mem_base_lo & PCI_MEMORY_RANGE_TYPE_MASK) | IORESOURCE_MEM | IORESOURCE_PREFETCH;
405 res->end = limit + 0xfffff;
409 static struct pci_bus * pci_alloc_bus(void)
413 b = kzalloc(sizeof(*b), GFP_KERNEL);
415 INIT_LIST_HEAD(&b->node);
416 INIT_LIST_HEAD(&b->children);
417 INIT_LIST_HEAD(&b->devices);
418 INIT_LIST_HEAD(&b->slots);
423 static struct pci_bus *pci_alloc_child_bus(struct pci_bus *parent,
424 struct pci_dev *bridge, int busnr)
426 struct pci_bus *child;
430 * Allocate a new bus, and inherit stuff from the parent..
432 child = pci_alloc_bus();
436 child->self = bridge;
437 child->parent = parent;
438 child->ops = parent->ops;
439 child->sysdata = parent->sysdata;
440 child->bus_flags = parent->bus_flags;
441 child->bridge = get_device(&bridge->dev);
443 /* initialize some portions of the bus device, but don't register it
444 * now as the parent is not properly set up yet. This device will get
445 * registered later in pci_bus_add_devices()
447 child->dev.class = &pcibus_class;
448 sprintf(child->dev.bus_id, "%04x:%02x", pci_domain_nr(child), busnr);
451 * Set up the primary, secondary and subordinate
454 child->number = child->secondary = busnr;
455 child->primary = parent->secondary;
456 child->subordinate = 0xff;
458 /* Set up default resource pointers and names.. */
459 for (i = 0; i < 4; i++) {
460 child->resource[i] = &bridge->resource[PCI_BRIDGE_RESOURCES+i];
461 child->resource[i]->name = child->name;
463 bridge->subordinate = child;
468 struct pci_bus *__ref pci_add_new_bus(struct pci_bus *parent, struct pci_dev *dev, int busnr)
470 struct pci_bus *child;
472 child = pci_alloc_child_bus(parent, dev, busnr);
474 down_write(&pci_bus_sem);
475 list_add_tail(&child->node, &parent->children);
476 up_write(&pci_bus_sem);
481 static void pci_fixup_parent_subordinate_busnr(struct pci_bus *child, int max)
483 struct pci_bus *parent = child->parent;
485 /* Attempts to fix that up are really dangerous unless
486 we're going to re-assign all bus numbers. */
487 if (!pcibios_assign_all_busses())
490 while (parent->parent && parent->subordinate < max) {
491 parent->subordinate = max;
492 pci_write_config_byte(parent->self, PCI_SUBORDINATE_BUS, max);
493 parent = parent->parent;
498 * If it's a bridge, configure it and scan the bus behind it.
499 * For CardBus bridges, we don't scan behind as the devices will
500 * be handled by the bridge driver itself.
502 * We need to process bridges in two passes -- first we scan those
503 * already configured by the BIOS and after we are done with all of
504 * them, we proceed to assigning numbers to the remaining buses in
505 * order to avoid overlaps between old and new bus numbers.
507 int __devinit pci_scan_bridge(struct pci_bus *bus, struct pci_dev *dev, int max, int pass)
509 struct pci_bus *child;
510 int is_cardbus = (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS);
514 pci_read_config_dword(dev, PCI_PRIMARY_BUS, &buses);
516 dev_dbg(&dev->dev, "scanning behind bridge, config %06x, pass %d\n",
517 buses & 0xffffff, pass);
519 /* Disable MasterAbortMode during probing to avoid reporting
520 of bus errors (in some architectures) */
521 pci_read_config_word(dev, PCI_BRIDGE_CONTROL, &bctl);
522 pci_write_config_word(dev, PCI_BRIDGE_CONTROL,
523 bctl & ~PCI_BRIDGE_CTL_MASTER_ABORT);
525 if ((buses & 0xffff00) && !pcibios_assign_all_busses() && !is_cardbus) {
526 unsigned int cmax, busnr;
528 * Bus already configured by firmware, process it in the first
529 * pass and just note the configuration.
533 busnr = (buses >> 8) & 0xFF;
536 * If we already got to this bus through a different bridge,
537 * ignore it. This can happen with the i450NX chipset.
539 if (pci_find_bus(pci_domain_nr(bus), busnr)) {
540 dev_info(&dev->dev, "bus %04x:%02x already known\n",
541 pci_domain_nr(bus), busnr);
545 child = pci_add_new_bus(bus, dev, busnr);
548 child->primary = buses & 0xFF;
549 child->subordinate = (buses >> 16) & 0xFF;
550 child->bridge_ctl = bctl;
552 cmax = pci_scan_child_bus(child);
555 if (child->subordinate > max)
556 max = child->subordinate;
559 * We need to assign a number to this bus which we always
560 * do in the second pass.
563 if (pcibios_assign_all_busses())
564 /* Temporarily disable forwarding of the
565 configuration cycles on all bridges in
566 this bus segment to avoid possible
567 conflicts in the second pass between two
568 bridges programmed with overlapping
570 pci_write_config_dword(dev, PCI_PRIMARY_BUS,
576 pci_write_config_word(dev, PCI_STATUS, 0xffff);
578 /* Prevent assigning a bus number that already exists.
579 * This can happen when a bridge is hot-plugged */
580 if (pci_find_bus(pci_domain_nr(bus), max+1))
582 child = pci_add_new_bus(bus, dev, ++max);
583 buses = (buses & 0xff000000)
584 | ((unsigned int)(child->primary) << 0)
585 | ((unsigned int)(child->secondary) << 8)
586 | ((unsigned int)(child->subordinate) << 16);
589 * yenta.c forces a secondary latency timer of 176.
590 * Copy that behaviour here.
593 buses &= ~0xff000000;
594 buses |= CARDBUS_LATENCY_TIMER << 24;
598 * We need to blast all three values with a single write.
600 pci_write_config_dword(dev, PCI_PRIMARY_BUS, buses);
603 child->bridge_ctl = bctl;
605 * Adjust subordinate busnr in parent buses.
606 * We do this before scanning for children because
607 * some devices may not be detected if the bios
610 pci_fixup_parent_subordinate_busnr(child, max);
611 /* Now we can scan all subordinate buses... */
612 max = pci_scan_child_bus(child);
614 * now fix it up again since we have found
615 * the real value of max.
617 pci_fixup_parent_subordinate_busnr(child, max);
620 * For CardBus bridges, we leave 4 bus numbers
621 * as cards with a PCI-to-PCI bridge can be
624 for (i=0; i<CARDBUS_RESERVE_BUSNR; i++) {
625 struct pci_bus *parent = bus;
626 if (pci_find_bus(pci_domain_nr(bus),
629 while (parent->parent) {
630 if ((!pcibios_assign_all_busses()) &&
631 (parent->subordinate > max) &&
632 (parent->subordinate <= max+i)) {
635 parent = parent->parent;
639 * Often, there are two cardbus bridges
640 * -- try to leave one valid bus number
648 pci_fixup_parent_subordinate_busnr(child, max);
651 * Set the subordinate bus number to its real value.
653 child->subordinate = max;
654 pci_write_config_byte(dev, PCI_SUBORDINATE_BUS, max);
658 (is_cardbus ? "PCI CardBus %04x:%02x" : "PCI Bus %04x:%02x"),
659 pci_domain_nr(bus), child->number);
661 /* Has only triggered on CardBus, fixup is in yenta_socket */
662 while (bus->parent) {
663 if ((child->subordinate > bus->subordinate) ||
664 (child->number > bus->subordinate) ||
665 (child->number < bus->number) ||
666 (child->subordinate < bus->number)) {
667 pr_debug("PCI: Bus #%02x (-#%02x) is %s "
668 "hidden behind%s bridge #%02x (-#%02x)\n",
669 child->number, child->subordinate,
670 (bus->number > child->subordinate &&
671 bus->subordinate < child->number) ?
672 "wholly" : "partially",
673 bus->self->transparent ? " transparent" : "",
674 bus->number, bus->subordinate);
680 pci_write_config_word(dev, PCI_BRIDGE_CONTROL, bctl);
686 * Read interrupt line and base address registers.
687 * The architecture-dependent code can tweak these, of course.
689 static void pci_read_irq(struct pci_dev *dev)
693 pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &irq);
696 pci_read_config_byte(dev, PCI_INTERRUPT_LINE, &irq);
700 #define LEGACY_IO_RESOURCE (IORESOURCE_IO | IORESOURCE_PCI_FIXED)
703 * pci_setup_device - fill in class and map information of a device
704 * @dev: the device structure to fill
706 * Initialize the device structure with information about the device's
707 * vendor,class,memory and IO-space addresses,IRQ lines etc.
708 * Called at initialisation of the PCI subsystem and by CardBus services.
709 * Returns 0 on success and -1 if unknown type of device (not normal, bridge
712 static int pci_setup_device(struct pci_dev * dev)
716 dev_set_name(&dev->dev, "%04x:%02x:%02x.%d", pci_domain_nr(dev->bus),
717 dev->bus->number, PCI_SLOT(dev->devfn),
718 PCI_FUNC(dev->devfn));
720 pci_read_config_dword(dev, PCI_CLASS_REVISION, &class);
721 dev->revision = class & 0xff;
722 class >>= 8; /* upper 3 bytes */
726 dev_dbg(&dev->dev, "found [%04x/%04x] class %06x header type %02x\n",
727 dev->vendor, dev->device, class, dev->hdr_type);
729 /* "Unknown power state" */
730 dev->current_state = PCI_UNKNOWN;
732 /* Early fixups, before probing the BARs */
733 pci_fixup_device(pci_fixup_early, dev);
734 class = dev->class >> 8;
736 switch (dev->hdr_type) { /* header type */
737 case PCI_HEADER_TYPE_NORMAL: /* standard header */
738 if (class == PCI_CLASS_BRIDGE_PCI)
741 pci_read_bases(dev, 6, PCI_ROM_ADDRESS);
742 pci_read_config_word(dev, PCI_SUBSYSTEM_VENDOR_ID, &dev->subsystem_vendor);
743 pci_read_config_word(dev, PCI_SUBSYSTEM_ID, &dev->subsystem_device);
746 * Do the ugly legacy mode stuff here rather than broken chip
747 * quirk code. Legacy mode ATA controllers have fixed
748 * addresses. These are not always echoed in BAR0-3, and
749 * BAR0-3 in a few cases contain junk!
751 if (class == PCI_CLASS_STORAGE_IDE) {
753 pci_read_config_byte(dev, PCI_CLASS_PROG, &progif);
754 if ((progif & 1) == 0) {
755 dev->resource[0].start = 0x1F0;
756 dev->resource[0].end = 0x1F7;
757 dev->resource[0].flags = LEGACY_IO_RESOURCE;
758 dev->resource[1].start = 0x3F6;
759 dev->resource[1].end = 0x3F6;
760 dev->resource[1].flags = LEGACY_IO_RESOURCE;
762 if ((progif & 4) == 0) {
763 dev->resource[2].start = 0x170;
764 dev->resource[2].end = 0x177;
765 dev->resource[2].flags = LEGACY_IO_RESOURCE;
766 dev->resource[3].start = 0x376;
767 dev->resource[3].end = 0x376;
768 dev->resource[3].flags = LEGACY_IO_RESOURCE;
773 case PCI_HEADER_TYPE_BRIDGE: /* bridge header */
774 if (class != PCI_CLASS_BRIDGE_PCI)
776 /* The PCI-to-PCI bridge spec requires that subtractive
777 decoding (i.e. transparent) bridge must have programming
778 interface code of 0x01. */
780 dev->transparent = ((dev->class & 0xff) == 1);
781 pci_read_bases(dev, 2, PCI_ROM_ADDRESS1);
784 case PCI_HEADER_TYPE_CARDBUS: /* CardBus bridge header */
785 if (class != PCI_CLASS_BRIDGE_CARDBUS)
788 pci_read_bases(dev, 1, 0);
789 pci_read_config_word(dev, PCI_CB_SUBSYSTEM_VENDOR_ID, &dev->subsystem_vendor);
790 pci_read_config_word(dev, PCI_CB_SUBSYSTEM_ID, &dev->subsystem_device);
793 default: /* unknown header */
794 dev_err(&dev->dev, "unknown header type %02x, "
795 "ignoring device\n", dev->hdr_type);
799 dev_err(&dev->dev, "ignoring class %02x (doesn't match header "
800 "type %02x)\n", class, dev->hdr_type);
801 dev->class = PCI_CLASS_NOT_DEFINED;
804 /* We found a fine healthy device, go go go... */
809 * pci_release_dev - free a pci device structure when all users of it are finished.
810 * @dev: device that's been disconnected
812 * Will be called only by the device core when all users of this pci device are
815 static void pci_release_dev(struct device *dev)
817 struct pci_dev *pci_dev;
819 pci_dev = to_pci_dev(dev);
820 pci_vpd_release(pci_dev);
824 static void set_pcie_port_type(struct pci_dev *pdev)
829 pos = pci_find_capability(pdev, PCI_CAP_ID_EXP);
833 pci_read_config_word(pdev, pos + PCI_EXP_FLAGS, ®16);
834 pdev->pcie_type = (reg16 & PCI_EXP_FLAGS_TYPE) >> 4;
838 * pci_cfg_space_size - get the configuration space size of the PCI device.
841 * Regular PCI devices have 256 bytes, but PCI-X 2 and PCI Express devices
842 * have 4096 bytes. Even if the device is capable, that doesn't mean we can
843 * access it. Maybe we don't have a way to generate extended config space
844 * accesses, or the device is behind a reverse Express bridge. So we try
845 * reading the dword at 0x100 which must either be 0 or a valid extended
848 int pci_cfg_space_size_ext(struct pci_dev *dev)
852 if (pci_read_config_dword(dev, 256, &status) != PCIBIOS_SUCCESSFUL)
854 if (status == 0xffffffff)
857 return PCI_CFG_SPACE_EXP_SIZE;
860 return PCI_CFG_SPACE_SIZE;
863 int pci_cfg_space_size(struct pci_dev *dev)
868 pos = pci_find_capability(dev, PCI_CAP_ID_EXP);
870 pos = pci_find_capability(dev, PCI_CAP_ID_PCIX);
874 pci_read_config_dword(dev, pos + PCI_X_STATUS, &status);
875 if (!(status & (PCI_X_STATUS_266MHZ | PCI_X_STATUS_533MHZ)))
879 return pci_cfg_space_size_ext(dev);
882 return PCI_CFG_SPACE_SIZE;
885 static void pci_release_bus_bridge_dev(struct device *dev)
890 struct pci_dev *alloc_pci_dev(void)
894 dev = kzalloc(sizeof(struct pci_dev), GFP_KERNEL);
898 INIT_LIST_HEAD(&dev->bus_list);
900 pci_msi_init_pci_dev(dev);
904 EXPORT_SYMBOL(alloc_pci_dev);
907 * Read the config data for a PCI device, sanity-check it
908 * and fill in the dev structure...
910 static struct pci_dev *pci_scan_device(struct pci_bus *bus, int devfn)
917 if (pci_bus_read_config_dword(bus, devfn, PCI_VENDOR_ID, &l))
920 /* some broken boards return 0 or ~0 if a slot is empty: */
921 if (l == 0xffffffff || l == 0x00000000 ||
922 l == 0x0000ffff || l == 0xffff0000)
925 /* Configuration request Retry Status */
926 while (l == 0xffff0001) {
929 if (pci_bus_read_config_dword(bus, devfn, PCI_VENDOR_ID, &l))
931 /* Card hasn't responded in 60 seconds? Must be stuck. */
932 if (delay > 60 * 1000) {
933 printk(KERN_WARNING "pci %04x:%02x:%02x.%d: not "
934 "responding\n", pci_domain_nr(bus),
935 bus->number, PCI_SLOT(devfn),
941 if (pci_bus_read_config_byte(bus, devfn, PCI_HEADER_TYPE, &hdr_type))
944 dev = alloc_pci_dev();
949 dev->sysdata = bus->sysdata;
950 dev->dev.parent = bus->bridge;
951 dev->dev.bus = &pci_bus_type;
953 dev->hdr_type = hdr_type & 0x7f;
954 dev->multifunction = !!(hdr_type & 0x80);
955 dev->vendor = l & 0xffff;
956 dev->device = (l >> 16) & 0xffff;
957 dev->cfg_size = pci_cfg_space_size(dev);
958 dev->error_state = pci_channel_io_normal;
959 set_pcie_port_type(dev);
961 /* Assume 32-bit PCI; let 64-bit PCI cards (which are far rarer)
962 set this higher, assuming the system even supports it. */
963 dev->dma_mask = 0xffffffff;
964 if (pci_setup_device(dev) < 0) {
969 pci_vpd_pci22_init(dev);
974 void pci_device_add(struct pci_dev *dev, struct pci_bus *bus)
976 device_initialize(&dev->dev);
977 dev->dev.release = pci_release_dev;
980 dev->dev.dma_mask = &dev->dma_mask;
981 dev->dev.dma_parms = &dev->dma_parms;
982 dev->dev.coherent_dma_mask = 0xffffffffull;
984 pci_set_dma_max_seg_size(dev, 65536);
985 pci_set_dma_seg_boundary(dev, 0xffffffff);
987 /* Fix up broken headers */
988 pci_fixup_device(pci_fixup_header, dev);
990 /* Initialize power management of the device */
994 * Add the device to our list of discovered devices
995 * and the bus list for fixup functions, etc.
997 down_write(&pci_bus_sem);
998 list_add_tail(&dev->bus_list, &bus->devices);
999 up_write(&pci_bus_sem);
1002 struct pci_dev *__ref pci_scan_single_device(struct pci_bus *bus, int devfn)
1004 struct pci_dev *dev;
1006 dev = pci_scan_device(bus, devfn);
1010 pci_device_add(dev, bus);
1014 EXPORT_SYMBOL(pci_scan_single_device);
1017 * pci_scan_slot - scan a PCI slot on a bus for devices.
1018 * @bus: PCI bus to scan
1019 * @devfn: slot number to scan (must have zero function.)
1021 * Scan a PCI slot on the specified PCI bus for devices, adding
1022 * discovered devices to the @bus->devices list. New devices
1023 * will not have is_added set.
1025 int pci_scan_slot(struct pci_bus *bus, int devfn)
1030 scan_all_fns = pcibios_scan_all_fns(bus, devfn);
1032 for (func = 0; func < 8; func++, devfn++) {
1033 struct pci_dev *dev;
1035 dev = pci_scan_single_device(bus, devfn);
1040 * If this is a single function device,
1041 * don't scan past the first function.
1043 if (!dev->multifunction) {
1045 dev->multifunction = 1;
1051 if (func == 0 && !scan_all_fns)
1057 pcie_aspm_init_link_state(bus->self);
1062 unsigned int __devinit pci_scan_child_bus(struct pci_bus *bus)
1064 unsigned int devfn, pass, max = bus->secondary;
1065 struct pci_dev *dev;
1067 pr_debug("PCI: Scanning bus %04x:%02x\n", pci_domain_nr(bus), bus->number);
1069 /* Go find them, Rover! */
1070 for (devfn = 0; devfn < 0x100; devfn += 8)
1071 pci_scan_slot(bus, devfn);
1074 * After performing arch-dependent fixup of the bus, look behind
1075 * all PCI-to-PCI bridges on this bus.
1077 pr_debug("PCI: Fixups for bus %04x:%02x\n", pci_domain_nr(bus), bus->number);
1078 pcibios_fixup_bus(bus);
1079 for (pass=0; pass < 2; pass++)
1080 list_for_each_entry(dev, &bus->devices, bus_list) {
1081 if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE ||
1082 dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)
1083 max = pci_scan_bridge(bus, dev, max, pass);
1087 * We've scanned the bus and so we know all about what's on
1088 * the other side of any bridges that may be on this bus plus
1091 * Return how far we've got finding sub-buses.
1093 pr_debug("PCI: Bus scan for %04x:%02x returning with max=%02x\n",
1094 pci_domain_nr(bus), bus->number, max);
1098 void __attribute__((weak)) set_pci_bus_resources_arch_default(struct pci_bus *b)
1102 struct pci_bus * pci_create_bus(struct device *parent,
1103 int bus, struct pci_ops *ops, void *sysdata)
1109 b = pci_alloc_bus();
1113 dev = kmalloc(sizeof(*dev), GFP_KERNEL);
1119 b->sysdata = sysdata;
1122 if (pci_find_bus(pci_domain_nr(b), bus)) {
1123 /* If we already got to this bus through a different bridge, ignore it */
1124 pr_debug("PCI: Bus %04x:%02x already known\n", pci_domain_nr(b), bus);
1128 down_write(&pci_bus_sem);
1129 list_add_tail(&b->node, &pci_root_buses);
1130 up_write(&pci_bus_sem);
1132 memset(dev, 0, sizeof(*dev));
1133 dev->parent = parent;
1134 dev->release = pci_release_bus_bridge_dev;
1135 sprintf(dev->bus_id, "pci%04x:%02x", pci_domain_nr(b), bus);
1136 error = device_register(dev);
1139 b->bridge = get_device(dev);
1142 set_dev_node(b->bridge, pcibus_to_node(b));
1144 b->dev.class = &pcibus_class;
1145 b->dev.parent = b->bridge;
1146 sprintf(b->dev.bus_id, "%04x:%02x", pci_domain_nr(b), bus);
1147 error = device_register(&b->dev);
1149 goto class_dev_reg_err;
1150 error = device_create_file(&b->dev, &dev_attr_cpuaffinity);
1152 goto dev_create_file_err;
1154 /* Create legacy_io and legacy_mem files for this bus */
1155 pci_create_legacy_files(b);
1157 b->number = b->secondary = bus;
1158 b->resource[0] = &ioport_resource;
1159 b->resource[1] = &iomem_resource;
1161 set_pci_bus_resources_arch_default(b);
1165 dev_create_file_err:
1166 device_unregister(&b->dev);
1168 device_unregister(dev);
1170 down_write(&pci_bus_sem);
1172 up_write(&pci_bus_sem);
1179 struct pci_bus * __devinit pci_scan_bus_parented(struct device *parent,
1180 int bus, struct pci_ops *ops, void *sysdata)
1184 b = pci_create_bus(parent, bus, ops, sysdata);
1186 b->subordinate = pci_scan_child_bus(b);
1189 EXPORT_SYMBOL(pci_scan_bus_parented);
1191 #ifdef CONFIG_HOTPLUG
1192 EXPORT_SYMBOL(pci_add_new_bus);
1193 EXPORT_SYMBOL(pci_scan_slot);
1194 EXPORT_SYMBOL(pci_scan_bridge);
1195 EXPORT_SYMBOL_GPL(pci_scan_child_bus);
1198 static int __init pci_sort_bf_cmp(const struct pci_dev *a, const struct pci_dev *b)
1200 if (pci_domain_nr(a->bus) < pci_domain_nr(b->bus)) return -1;
1201 else if (pci_domain_nr(a->bus) > pci_domain_nr(b->bus)) return 1;
1203 if (a->bus->number < b->bus->number) return -1;
1204 else if (a->bus->number > b->bus->number) return 1;
1206 if (a->devfn < b->devfn) return -1;
1207 else if (a->devfn > b->devfn) return 1;
1213 * Yes, this forcably breaks the klist abstraction temporarily. It
1214 * just wants to sort the klist, not change reference counts and
1215 * take/drop locks rapidly in the process. It does all this while
1216 * holding the lock for the list, so objects can't otherwise be
1217 * added/removed while we're swizzling.
1219 static void __init pci_insertion_sort_klist(struct pci_dev *a, struct list_head *list)
1221 struct list_head *pos;
1222 struct klist_node *n;
1226 list_for_each(pos, list) {
1227 n = container_of(pos, struct klist_node, n_node);
1228 dev = container_of(n, struct device, knode_bus);
1229 b = to_pci_dev(dev);
1230 if (pci_sort_bf_cmp(a, b) <= 0) {
1231 list_move_tail(&a->dev.knode_bus.n_node, &b->dev.knode_bus.n_node);
1235 list_move_tail(&a->dev.knode_bus.n_node, list);
1238 void __init pci_sort_breadthfirst(void)
1240 LIST_HEAD(sorted_devices);
1241 struct list_head *pos, *tmp;
1242 struct klist_node *n;
1244 struct pci_dev *pdev;
1245 struct klist *device_klist;
1247 device_klist = bus_get_device_klist(&pci_bus_type);
1249 spin_lock(&device_klist->k_lock);
1250 list_for_each_safe(pos, tmp, &device_klist->k_list) {
1251 n = container_of(pos, struct klist_node, n_node);
1252 dev = container_of(n, struct device, knode_bus);
1253 pdev = to_pci_dev(dev);
1254 pci_insertion_sort_klist(pdev, &sorted_devices);
1256 list_splice(&sorted_devices, &device_klist->k_list);
1257 spin_unlock(&device_klist->k_lock);