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
18 /* Ugh. Need to stop exporting this to modules. */
19 LIST_HEAD(pci_root_buses);
20 EXPORT_SYMBOL(pci_root_buses);
23 static int find_anything(struct device *dev, void *data)
29 * Some device drivers need know if pci is initiated.
30 * Basically, we think pci is not initiated when there
31 * is no device to be found on the pci_bus_type.
33 int no_pci_devices(void)
38 dev = bus_find_device(&pci_bus_type, NULL, NULL, find_anything);
39 no_devices = (dev == NULL);
43 EXPORT_SYMBOL(no_pci_devices);
46 * PCI Bus Class Devices
48 static ssize_t pci_bus_show_cpuaffinity(struct device *dev,
50 struct device_attribute *attr,
54 const struct cpumask *cpumask;
56 cpumask = cpumask_of_pcibus(to_pci_bus(dev));
58 cpulist_scnprintf(buf, PAGE_SIZE-2, cpumask) :
59 cpumask_scnprintf(buf, PAGE_SIZE-2, cpumask);
65 static ssize_t inline pci_bus_show_cpumaskaffinity(struct device *dev,
66 struct device_attribute *attr,
69 return pci_bus_show_cpuaffinity(dev, 0, attr, buf);
72 static ssize_t inline pci_bus_show_cpulistaffinity(struct device *dev,
73 struct device_attribute *attr,
76 return pci_bus_show_cpuaffinity(dev, 1, attr, buf);
79 DEVICE_ATTR(cpuaffinity, S_IRUGO, pci_bus_show_cpumaskaffinity, NULL);
80 DEVICE_ATTR(cpulistaffinity, S_IRUGO, pci_bus_show_cpulistaffinity, NULL);
85 static void release_pcibus_dev(struct device *dev)
87 struct pci_bus *pci_bus = to_pci_bus(dev);
90 put_device(pci_bus->bridge);
94 static struct class pcibus_class = {
96 .dev_release = &release_pcibus_dev,
99 static int __init pcibus_class_init(void)
101 return class_register(&pcibus_class);
103 postcore_initcall(pcibus_class_init);
106 * Translate the low bits of the PCI base
107 * to the resource type
109 static inline unsigned int pci_calc_resource_flags(unsigned int flags)
111 if (flags & PCI_BASE_ADDRESS_SPACE_IO)
112 return IORESOURCE_IO;
114 if (flags & PCI_BASE_ADDRESS_MEM_PREFETCH)
115 return IORESOURCE_MEM | IORESOURCE_PREFETCH;
117 return IORESOURCE_MEM;
120 static u64 pci_size(u64 base, u64 maxbase, u64 mask)
122 u64 size = mask & maxbase; /* Find the significant bits */
126 /* Get the lowest of them to find the decode size, and
127 from that the extent. */
128 size = (size & ~(size-1)) - 1;
130 /* base == maxbase can be valid only if the BAR has
131 already been programmed with all 1s. */
132 if (base == maxbase && ((base | size) & mask) != mask)
138 static inline enum pci_bar_type decode_bar(struct resource *res, u32 bar)
140 if ((bar & PCI_BASE_ADDRESS_SPACE) == PCI_BASE_ADDRESS_SPACE_IO) {
141 res->flags = bar & ~PCI_BASE_ADDRESS_IO_MASK;
145 res->flags = bar & ~PCI_BASE_ADDRESS_MEM_MASK;
147 if (res->flags & PCI_BASE_ADDRESS_MEM_TYPE_64)
148 return pci_bar_mem64;
149 return pci_bar_mem32;
153 * pci_read_base - read a PCI BAR
154 * @dev: the PCI device
155 * @type: type of the BAR
156 * @res: resource buffer to be filled in
157 * @pos: BAR position in the config space
159 * Returns 1 if the BAR is 64-bit, or 0 if 32-bit.
161 int __pci_read_base(struct pci_dev *dev, enum pci_bar_type type,
162 struct resource *res, unsigned int pos)
166 mask = type ? ~PCI_ROM_ADDRESS_ENABLE : ~0;
168 res->name = pci_name(dev);
170 pci_read_config_dword(dev, pos, &l);
171 pci_write_config_dword(dev, pos, mask);
172 pci_read_config_dword(dev, pos, &sz);
173 pci_write_config_dword(dev, pos, l);
176 * All bits set in sz means the device isn't working properly.
177 * If the BAR isn't implemented, all bits must be 0. If it's a
178 * memory BAR or a ROM, bit 0 must be clear; if it's an io BAR, bit
181 if (!sz || sz == 0xffffffff)
185 * I don't know how l can have all bits set. Copied from old code.
186 * Maybe it fixes a bug on some ancient platform.
191 if (type == pci_bar_unknown) {
192 type = decode_bar(res, l);
193 res->flags |= pci_calc_resource_flags(l) | IORESOURCE_SIZEALIGN;
194 if (type == pci_bar_io) {
195 l &= PCI_BASE_ADDRESS_IO_MASK;
196 mask = PCI_BASE_ADDRESS_IO_MASK & 0xffff;
198 l &= PCI_BASE_ADDRESS_MEM_MASK;
199 mask = (u32)PCI_BASE_ADDRESS_MEM_MASK;
202 res->flags |= (l & IORESOURCE_ROM_ENABLE);
203 l &= PCI_ROM_ADDRESS_MASK;
204 mask = (u32)PCI_ROM_ADDRESS_MASK;
207 if (type == pci_bar_mem64) {
210 u64 mask64 = mask | (u64)~0 << 32;
212 pci_read_config_dword(dev, pos + 4, &l);
213 pci_write_config_dword(dev, pos + 4, ~0);
214 pci_read_config_dword(dev, pos + 4, &sz);
215 pci_write_config_dword(dev, pos + 4, l);
217 l64 |= ((u64)l << 32);
218 sz64 |= ((u64)sz << 32);
220 sz64 = pci_size(l64, sz64, mask64);
225 if ((sizeof(resource_size_t) < 8) && (sz64 > 0x100000000ULL)) {
226 dev_err(&dev->dev, "can't handle 64-bit BAR\n");
228 } else if ((sizeof(resource_size_t) < 8) && l) {
229 /* Address above 32-bit boundary; disable the BAR */
230 pci_write_config_dword(dev, pos, 0);
231 pci_write_config_dword(dev, pos + 4, 0);
236 res->end = l64 + sz64;
237 dev_printk(KERN_DEBUG, &dev->dev,
238 "reg %x 64bit mmio: %pR\n", pos, res);
241 sz = pci_size(l, sz, mask);
249 dev_printk(KERN_DEBUG, &dev->dev, "reg %x %s: %pR\n", pos,
250 (res->flags & IORESOURCE_IO) ? "io port" : "32bit mmio",
255 return (type == pci_bar_mem64) ? 1 : 0;
261 static void pci_read_bases(struct pci_dev *dev, unsigned int howmany, int rom)
263 unsigned int pos, reg;
265 for (pos = 0; pos < howmany; pos++) {
266 struct resource *res = &dev->resource[pos];
267 reg = PCI_BASE_ADDRESS_0 + (pos << 2);
268 pos += __pci_read_base(dev, pci_bar_unknown, res, reg);
272 struct resource *res = &dev->resource[PCI_ROM_RESOURCE];
273 dev->rom_base_reg = rom;
274 res->flags = IORESOURCE_MEM | IORESOURCE_PREFETCH |
275 IORESOURCE_READONLY | IORESOURCE_CACHEABLE |
276 IORESOURCE_SIZEALIGN;
277 __pci_read_base(dev, pci_bar_mem32, res, rom);
281 void __devinit pci_read_bridge_bases(struct pci_bus *child)
283 struct pci_dev *dev = child->self;
284 u8 io_base_lo, io_limit_lo;
285 u16 mem_base_lo, mem_limit_lo;
286 unsigned long base, limit;
287 struct resource *res;
290 if (!child->parent) /* It's a host bus, nothing to read */
293 if (dev->transparent) {
294 dev_info(&dev->dev, "transparent bridge\n");
295 for(i = 3; i < PCI_BUS_NUM_RESOURCES; i++)
296 child->resource[i] = child->parent->resource[i - 3];
299 res = child->resource[0];
300 pci_read_config_byte(dev, PCI_IO_BASE, &io_base_lo);
301 pci_read_config_byte(dev, PCI_IO_LIMIT, &io_limit_lo);
302 base = (io_base_lo & PCI_IO_RANGE_MASK) << 8;
303 limit = (io_limit_lo & PCI_IO_RANGE_MASK) << 8;
305 if ((io_base_lo & PCI_IO_RANGE_TYPE_MASK) == PCI_IO_RANGE_TYPE_32) {
306 u16 io_base_hi, io_limit_hi;
307 pci_read_config_word(dev, PCI_IO_BASE_UPPER16, &io_base_hi);
308 pci_read_config_word(dev, PCI_IO_LIMIT_UPPER16, &io_limit_hi);
309 base |= (io_base_hi << 16);
310 limit |= (io_limit_hi << 16);
314 res->flags = (io_base_lo & PCI_IO_RANGE_TYPE_MASK) | IORESOURCE_IO;
318 res->end = limit + 0xfff;
319 dev_printk(KERN_DEBUG, &dev->dev, "bridge io port: %pR\n", res);
322 res = child->resource[1];
323 pci_read_config_word(dev, PCI_MEMORY_BASE, &mem_base_lo);
324 pci_read_config_word(dev, PCI_MEMORY_LIMIT, &mem_limit_lo);
325 base = (mem_base_lo & PCI_MEMORY_RANGE_MASK) << 16;
326 limit = (mem_limit_lo & PCI_MEMORY_RANGE_MASK) << 16;
328 res->flags = (mem_base_lo & PCI_MEMORY_RANGE_TYPE_MASK) | IORESOURCE_MEM;
330 res->end = limit + 0xfffff;
331 dev_printk(KERN_DEBUG, &dev->dev, "bridge 32bit mmio: %pR\n",
335 res = child->resource[2];
336 pci_read_config_word(dev, PCI_PREF_MEMORY_BASE, &mem_base_lo);
337 pci_read_config_word(dev, PCI_PREF_MEMORY_LIMIT, &mem_limit_lo);
338 base = (mem_base_lo & PCI_PREF_RANGE_MASK) << 16;
339 limit = (mem_limit_lo & PCI_PREF_RANGE_MASK) << 16;
341 if ((mem_base_lo & PCI_PREF_RANGE_TYPE_MASK) == PCI_PREF_RANGE_TYPE_64) {
342 u32 mem_base_hi, mem_limit_hi;
343 pci_read_config_dword(dev, PCI_PREF_BASE_UPPER32, &mem_base_hi);
344 pci_read_config_dword(dev, PCI_PREF_LIMIT_UPPER32, &mem_limit_hi);
347 * Some bridges set the base > limit by default, and some
348 * (broken) BIOSes do not initialize them. If we find
349 * this, just assume they are not being used.
351 if (mem_base_hi <= mem_limit_hi) {
352 #if BITS_PER_LONG == 64
353 base |= ((long) mem_base_hi) << 32;
354 limit |= ((long) mem_limit_hi) << 32;
356 if (mem_base_hi || mem_limit_hi) {
357 dev_err(&dev->dev, "can't handle 64-bit "
358 "address space for bridge\n");
365 res->flags = (mem_base_lo & PCI_MEMORY_RANGE_TYPE_MASK) | IORESOURCE_MEM | IORESOURCE_PREFETCH;
367 res->end = limit + 0xfffff;
368 dev_printk(KERN_DEBUG, &dev->dev, "bridge %sbit mmio pref: %pR\n",
369 (res->flags & PCI_PREF_RANGE_TYPE_64) ? "64" : "32",
374 static struct pci_bus * pci_alloc_bus(void)
378 b = kzalloc(sizeof(*b), GFP_KERNEL);
380 INIT_LIST_HEAD(&b->node);
381 INIT_LIST_HEAD(&b->children);
382 INIT_LIST_HEAD(&b->devices);
383 INIT_LIST_HEAD(&b->slots);
388 static struct pci_bus *pci_alloc_child_bus(struct pci_bus *parent,
389 struct pci_dev *bridge, int busnr)
391 struct pci_bus *child;
395 * Allocate a new bus, and inherit stuff from the parent..
397 child = pci_alloc_bus();
401 child->parent = parent;
402 child->ops = parent->ops;
403 child->sysdata = parent->sysdata;
404 child->bus_flags = parent->bus_flags;
406 /* initialize some portions of the bus device, but don't register it
407 * now as the parent is not properly set up yet. This device will get
408 * registered later in pci_bus_add_devices()
410 child->dev.class = &pcibus_class;
411 dev_set_name(&child->dev, "%04x:%02x", pci_domain_nr(child), busnr);
414 * Set up the primary, secondary and subordinate
417 child->number = child->secondary = busnr;
418 child->primary = parent->secondary;
419 child->subordinate = 0xff;
424 child->self = bridge;
425 child->bridge = get_device(&bridge->dev);
427 /* Set up default resource pointers and names.. */
428 for (i = 0; i < PCI_BRIDGE_RESOURCE_NUM; i++) {
429 child->resource[i] = &bridge->resource[PCI_BRIDGE_RESOURCES+i];
430 child->resource[i]->name = child->name;
432 bridge->subordinate = child;
437 struct pci_bus *__ref pci_add_new_bus(struct pci_bus *parent, struct pci_dev *dev, int busnr)
439 struct pci_bus *child;
441 child = pci_alloc_child_bus(parent, dev, busnr);
443 down_write(&pci_bus_sem);
444 list_add_tail(&child->node, &parent->children);
445 up_write(&pci_bus_sem);
450 static void pci_fixup_parent_subordinate_busnr(struct pci_bus *child, int max)
452 struct pci_bus *parent = child->parent;
454 /* Attempts to fix that up are really dangerous unless
455 we're going to re-assign all bus numbers. */
456 if (!pcibios_assign_all_busses())
459 while (parent->parent && parent->subordinate < max) {
460 parent->subordinate = max;
461 pci_write_config_byte(parent->self, PCI_SUBORDINATE_BUS, max);
462 parent = parent->parent;
467 * If it's a bridge, configure it and scan the bus behind it.
468 * For CardBus bridges, we don't scan behind as the devices will
469 * be handled by the bridge driver itself.
471 * We need to process bridges in two passes -- first we scan those
472 * already configured by the BIOS and after we are done with all of
473 * them, we proceed to assigning numbers to the remaining buses in
474 * order to avoid overlaps between old and new bus numbers.
476 int __devinit pci_scan_bridge(struct pci_bus *bus, struct pci_dev *dev, int max, int pass)
478 struct pci_bus *child;
479 int is_cardbus = (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS);
484 pci_read_config_dword(dev, PCI_PRIMARY_BUS, &buses);
486 dev_dbg(&dev->dev, "scanning behind bridge, config %06x, pass %d\n",
487 buses & 0xffffff, pass);
489 /* Check if setup is sensible at all */
491 ((buses & 0xff) != bus->number || ((buses >> 8) & 0xff) <= bus->number)) {
492 dev_dbg(&dev->dev, "bus configuration invalid, reconfiguring\n");
496 /* Disable MasterAbortMode during probing to avoid reporting
497 of bus errors (in some architectures) */
498 pci_read_config_word(dev, PCI_BRIDGE_CONTROL, &bctl);
499 pci_write_config_word(dev, PCI_BRIDGE_CONTROL,
500 bctl & ~PCI_BRIDGE_CTL_MASTER_ABORT);
502 if ((buses & 0xffff00) && !pcibios_assign_all_busses() && !is_cardbus && !broken) {
503 unsigned int cmax, busnr;
505 * Bus already configured by firmware, process it in the first
506 * pass and just note the configuration.
510 busnr = (buses >> 8) & 0xFF;
513 * If we already got to this bus through a different bridge,
514 * ignore it. This can happen with the i450NX chipset.
516 if (pci_find_bus(pci_domain_nr(bus), busnr)) {
517 dev_info(&dev->dev, "bus %04x:%02x already known\n",
518 pci_domain_nr(bus), busnr);
522 child = pci_add_new_bus(bus, dev, busnr);
525 child->primary = buses & 0xFF;
526 child->subordinate = (buses >> 16) & 0xFF;
527 child->bridge_ctl = bctl;
529 cmax = pci_scan_child_bus(child);
532 if (child->subordinate > max)
533 max = child->subordinate;
536 * We need to assign a number to this bus which we always
537 * do in the second pass.
540 if (pcibios_assign_all_busses() || broken)
541 /* Temporarily disable forwarding of the
542 configuration cycles on all bridges in
543 this bus segment to avoid possible
544 conflicts in the second pass between two
545 bridges programmed with overlapping
547 pci_write_config_dword(dev, PCI_PRIMARY_BUS,
553 pci_write_config_word(dev, PCI_STATUS, 0xffff);
555 /* Prevent assigning a bus number that already exists.
556 * This can happen when a bridge is hot-plugged */
557 if (pci_find_bus(pci_domain_nr(bus), max+1))
559 child = pci_add_new_bus(bus, dev, ++max);
560 buses = (buses & 0xff000000)
561 | ((unsigned int)(child->primary) << 0)
562 | ((unsigned int)(child->secondary) << 8)
563 | ((unsigned int)(child->subordinate) << 16);
566 * yenta.c forces a secondary latency timer of 176.
567 * Copy that behaviour here.
570 buses &= ~0xff000000;
571 buses |= CARDBUS_LATENCY_TIMER << 24;
575 * We need to blast all three values with a single write.
577 pci_write_config_dword(dev, PCI_PRIMARY_BUS, buses);
580 child->bridge_ctl = bctl;
582 * Adjust subordinate busnr in parent buses.
583 * We do this before scanning for children because
584 * some devices may not be detected if the bios
587 pci_fixup_parent_subordinate_busnr(child, max);
588 /* Now we can scan all subordinate buses... */
589 max = pci_scan_child_bus(child);
591 * now fix it up again since we have found
592 * the real value of max.
594 pci_fixup_parent_subordinate_busnr(child, max);
597 * For CardBus bridges, we leave 4 bus numbers
598 * as cards with a PCI-to-PCI bridge can be
601 for (i=0; i<CARDBUS_RESERVE_BUSNR; i++) {
602 struct pci_bus *parent = bus;
603 if (pci_find_bus(pci_domain_nr(bus),
606 while (parent->parent) {
607 if ((!pcibios_assign_all_busses()) &&
608 (parent->subordinate > max) &&
609 (parent->subordinate <= max+i)) {
612 parent = parent->parent;
616 * Often, there are two cardbus bridges
617 * -- try to leave one valid bus number
625 pci_fixup_parent_subordinate_busnr(child, max);
628 * Set the subordinate bus number to its real value.
630 child->subordinate = max;
631 pci_write_config_byte(dev, PCI_SUBORDINATE_BUS, max);
635 (is_cardbus ? "PCI CardBus %04x:%02x" : "PCI Bus %04x:%02x"),
636 pci_domain_nr(bus), 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 static void set_pcie_port_type(struct pci_dev *pdev)
682 pos = pci_find_capability(pdev, PCI_CAP_ID_EXP);
686 pci_read_config_word(pdev, pos + PCI_EXP_FLAGS, ®16);
687 pdev->pcie_type = (reg16 & PCI_EXP_FLAGS_TYPE) >> 4;
690 #define LEGACY_IO_RESOURCE (IORESOURCE_IO | IORESOURCE_PCI_FIXED)
693 * pci_setup_device - fill in class and map information of a device
694 * @dev: the device structure to fill
696 * Initialize the device structure with information about the device's
697 * vendor,class,memory and IO-space addresses,IRQ lines etc.
698 * Called at initialisation of the PCI subsystem and by CardBus services.
699 * Returns 0 on success and negative if unknown type of device (not normal,
700 * bridge or CardBus).
702 int pci_setup_device(struct pci_dev *dev)
706 struct pci_slot *slot;
708 if (pci_read_config_byte(dev, PCI_HEADER_TYPE, &hdr_type))
711 dev->sysdata = dev->bus->sysdata;
712 dev->dev.parent = dev->bus->bridge;
713 dev->dev.bus = &pci_bus_type;
714 dev->hdr_type = hdr_type & 0x7f;
715 dev->multifunction = !!(hdr_type & 0x80);
716 dev->cfg_size = pci_cfg_space_size(dev);
717 dev->error_state = pci_channel_io_normal;
718 set_pcie_port_type(dev);
720 list_for_each_entry(slot, &dev->bus->slots, list)
721 if (PCI_SLOT(dev->devfn) == slot->number)
724 /* Assume 32-bit PCI; let 64-bit PCI cards (which are far rarer)
725 set this higher, assuming the system even supports it. */
726 dev->dma_mask = 0xffffffff;
728 dev_set_name(&dev->dev, "%04x:%02x:%02x.%d", pci_domain_nr(dev->bus),
729 dev->bus->number, PCI_SLOT(dev->devfn),
730 PCI_FUNC(dev->devfn));
732 pci_read_config_dword(dev, PCI_CLASS_REVISION, &class);
733 dev->revision = class & 0xff;
734 class >>= 8; /* upper 3 bytes */
738 dev_dbg(&dev->dev, "found [%04x:%04x] class %06x header type %02x\n",
739 dev->vendor, dev->device, class, dev->hdr_type);
741 /* "Unknown power state" */
742 dev->current_state = PCI_UNKNOWN;
744 /* Early fixups, before probing the BARs */
745 pci_fixup_device(pci_fixup_early, dev);
747 switch (dev->hdr_type) { /* header type */
748 case PCI_HEADER_TYPE_NORMAL: /* standard header */
749 if (class == PCI_CLASS_BRIDGE_PCI)
752 pci_read_bases(dev, 6, PCI_ROM_ADDRESS);
753 pci_read_config_word(dev, PCI_SUBSYSTEM_VENDOR_ID, &dev->subsystem_vendor);
754 pci_read_config_word(dev, PCI_SUBSYSTEM_ID, &dev->subsystem_device);
757 * Do the ugly legacy mode stuff here rather than broken chip
758 * quirk code. Legacy mode ATA controllers have fixed
759 * addresses. These are not always echoed in BAR0-3, and
760 * BAR0-3 in a few cases contain junk!
762 if (class == PCI_CLASS_STORAGE_IDE) {
764 pci_read_config_byte(dev, PCI_CLASS_PROG, &progif);
765 if ((progif & 1) == 0) {
766 dev->resource[0].start = 0x1F0;
767 dev->resource[0].end = 0x1F7;
768 dev->resource[0].flags = LEGACY_IO_RESOURCE;
769 dev->resource[1].start = 0x3F6;
770 dev->resource[1].end = 0x3F6;
771 dev->resource[1].flags = LEGACY_IO_RESOURCE;
773 if ((progif & 4) == 0) {
774 dev->resource[2].start = 0x170;
775 dev->resource[2].end = 0x177;
776 dev->resource[2].flags = LEGACY_IO_RESOURCE;
777 dev->resource[3].start = 0x376;
778 dev->resource[3].end = 0x376;
779 dev->resource[3].flags = LEGACY_IO_RESOURCE;
784 case PCI_HEADER_TYPE_BRIDGE: /* bridge header */
785 if (class != PCI_CLASS_BRIDGE_PCI)
787 /* The PCI-to-PCI bridge spec requires that subtractive
788 decoding (i.e. transparent) bridge must have programming
789 interface code of 0x01. */
791 dev->transparent = ((dev->class & 0xff) == 1);
792 pci_read_bases(dev, 2, PCI_ROM_ADDRESS1);
795 case PCI_HEADER_TYPE_CARDBUS: /* CardBus bridge header */
796 if (class != PCI_CLASS_BRIDGE_CARDBUS)
799 pci_read_bases(dev, 1, 0);
800 pci_read_config_word(dev, PCI_CB_SUBSYSTEM_VENDOR_ID, &dev->subsystem_vendor);
801 pci_read_config_word(dev, PCI_CB_SUBSYSTEM_ID, &dev->subsystem_device);
804 default: /* unknown header */
805 dev_err(&dev->dev, "unknown header type %02x, "
806 "ignoring device\n", dev->hdr_type);
810 dev_err(&dev->dev, "ignoring class %02x (doesn't match header "
811 "type %02x)\n", class, dev->hdr_type);
812 dev->class = PCI_CLASS_NOT_DEFINED;
815 /* We found a fine healthy device, go go go... */
819 static void pci_release_capabilities(struct pci_dev *dev)
821 pci_vpd_release(dev);
822 pci_iov_release(dev);
826 * pci_release_dev - free a pci device structure when all users of it are finished.
827 * @dev: device that's been disconnected
829 * Will be called only by the device core when all users of this pci device are
832 static void pci_release_dev(struct device *dev)
834 struct pci_dev *pci_dev;
836 pci_dev = to_pci_dev(dev);
837 pci_release_capabilities(pci_dev);
842 * pci_cfg_space_size - get the configuration space size of the PCI device.
845 * Regular PCI devices have 256 bytes, but PCI-X 2 and PCI Express devices
846 * have 4096 bytes. Even if the device is capable, that doesn't mean we can
847 * access it. Maybe we don't have a way to generate extended config space
848 * accesses, or the device is behind a reverse Express bridge. So we try
849 * reading the dword at 0x100 which must either be 0 or a valid extended
852 int pci_cfg_space_size_ext(struct pci_dev *dev)
855 int pos = PCI_CFG_SPACE_SIZE;
857 if (pci_read_config_dword(dev, pos, &status) != PCIBIOS_SUCCESSFUL)
859 if (status == 0xffffffff)
862 return PCI_CFG_SPACE_EXP_SIZE;
865 return PCI_CFG_SPACE_SIZE;
868 int pci_cfg_space_size(struct pci_dev *dev)
874 class = dev->class >> 8;
875 if (class == PCI_CLASS_BRIDGE_HOST)
876 return pci_cfg_space_size_ext(dev);
878 pos = pci_find_capability(dev, PCI_CAP_ID_EXP);
880 pos = pci_find_capability(dev, PCI_CAP_ID_PCIX);
884 pci_read_config_dword(dev, pos + PCI_X_STATUS, &status);
885 if (!(status & (PCI_X_STATUS_266MHZ | PCI_X_STATUS_533MHZ)))
889 return pci_cfg_space_size_ext(dev);
892 return PCI_CFG_SPACE_SIZE;
895 static void pci_release_bus_bridge_dev(struct device *dev)
900 struct pci_dev *alloc_pci_dev(void)
904 dev = kzalloc(sizeof(struct pci_dev), GFP_KERNEL);
908 INIT_LIST_HEAD(&dev->bus_list);
912 EXPORT_SYMBOL(alloc_pci_dev);
915 * Read the config data for a PCI device, sanity-check it
916 * and fill in the dev structure...
918 static struct pci_dev *pci_scan_device(struct pci_bus *bus, int devfn)
924 if (pci_bus_read_config_dword(bus, devfn, PCI_VENDOR_ID, &l))
927 /* some broken boards return 0 or ~0 if a slot is empty: */
928 if (l == 0xffffffff || l == 0x00000000 ||
929 l == 0x0000ffff || l == 0xffff0000)
932 /* Configuration request Retry Status */
933 while (l == 0xffff0001) {
936 if (pci_bus_read_config_dword(bus, devfn, PCI_VENDOR_ID, &l))
938 /* Card hasn't responded in 60 seconds? Must be stuck. */
939 if (delay > 60 * 1000) {
940 printk(KERN_WARNING "pci %04x:%02x:%02x.%d: not "
941 "responding\n", pci_domain_nr(bus),
942 bus->number, PCI_SLOT(devfn),
948 dev = alloc_pci_dev();
954 dev->vendor = l & 0xffff;
955 dev->device = (l >> 16) & 0xffff;
957 if (pci_setup_device(dev)) {
962 /* need to have dev->class ready */
963 dev->cfg_size = pci_cfg_space_size(dev);
968 static void pci_init_capabilities(struct pci_dev *dev)
971 pci_msi_init_pci_dev(dev);
973 /* Buffers for saving PCIe and PCI-X capabilities */
974 pci_allocate_cap_save_buffers(dev);
976 /* Power Management */
978 platform_pci_wakeup_init(dev);
980 /* Vital Product Data */
981 pci_vpd_pci22_init(dev);
983 /* Alternative Routing-ID Forwarding */
986 /* Single Root I/O Virtualization */
990 void pci_device_add(struct pci_dev *dev, struct pci_bus *bus)
992 device_initialize(&dev->dev);
993 dev->dev.release = pci_release_dev;
996 dev->dev.dma_mask = &dev->dma_mask;
997 dev->dev.dma_parms = &dev->dma_parms;
998 dev->dev.coherent_dma_mask = 0xffffffffull;
1000 pci_set_dma_max_seg_size(dev, 65536);
1001 pci_set_dma_seg_boundary(dev, 0xffffffff);
1003 /* Fix up broken headers */
1004 pci_fixup_device(pci_fixup_header, dev);
1006 /* Initialize various capabilities */
1007 pci_init_capabilities(dev);
1010 * Add the device to our list of discovered devices
1011 * and the bus list for fixup functions, etc.
1013 down_write(&pci_bus_sem);
1014 list_add_tail(&dev->bus_list, &bus->devices);
1015 up_write(&pci_bus_sem);
1018 struct pci_dev *__ref pci_scan_single_device(struct pci_bus *bus, int devfn)
1020 struct pci_dev *dev;
1022 dev = pci_get_slot(bus, devfn);
1028 dev = pci_scan_device(bus, devfn);
1032 pci_device_add(dev, bus);
1036 EXPORT_SYMBOL(pci_scan_single_device);
1039 * pci_scan_slot - scan a PCI slot on a bus for devices.
1040 * @bus: PCI bus to scan
1041 * @devfn: slot number to scan (must have zero function.)
1043 * Scan a PCI slot on the specified PCI bus for devices, adding
1044 * discovered devices to the @bus->devices list. New devices
1045 * will not have is_added set.
1047 int pci_scan_slot(struct pci_bus *bus, int devfn)
1052 scan_all_fns = pcibios_scan_all_fns(bus, devfn);
1054 for (func = 0; func < 8; func++, devfn++) {
1055 struct pci_dev *dev;
1057 dev = pci_scan_single_device(bus, devfn);
1062 * If this is a single function device,
1063 * don't scan past the first function.
1065 if (!dev->multifunction) {
1067 dev->multifunction = 1;
1073 if (func == 0 && !scan_all_fns)
1078 /* only one slot has pcie device */
1079 if (bus->self && nr)
1080 pcie_aspm_init_link_state(bus->self);
1085 unsigned int __devinit pci_scan_child_bus(struct pci_bus *bus)
1087 unsigned int devfn, pass, max = bus->secondary;
1088 struct pci_dev *dev;
1090 pr_debug("PCI: Scanning bus %04x:%02x\n", pci_domain_nr(bus), bus->number);
1092 /* Go find them, Rover! */
1093 for (devfn = 0; devfn < 0x100; devfn += 8)
1094 pci_scan_slot(bus, devfn);
1096 /* Reserve buses for SR-IOV capability. */
1097 max += pci_iov_bus_range(bus);
1100 * After performing arch-dependent fixup of the bus, look behind
1101 * all PCI-to-PCI bridges on this bus.
1103 pr_debug("PCI: Fixups for bus %04x:%02x\n", pci_domain_nr(bus), bus->number);
1104 pcibios_fixup_bus(bus);
1105 for (pass=0; pass < 2; pass++)
1106 list_for_each_entry(dev, &bus->devices, bus_list) {
1107 if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE ||
1108 dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)
1109 max = pci_scan_bridge(bus, dev, max, pass);
1113 * We've scanned the bus and so we know all about what's on
1114 * the other side of any bridges that may be on this bus plus
1117 * Return how far we've got finding sub-buses.
1119 pr_debug("PCI: Bus scan for %04x:%02x returning with max=%02x\n",
1120 pci_domain_nr(bus), bus->number, max);
1124 void __attribute__((weak)) set_pci_bus_resources_arch_default(struct pci_bus *b)
1128 struct pci_bus * pci_create_bus(struct device *parent,
1129 int bus, struct pci_ops *ops, void *sysdata)
1135 b = pci_alloc_bus();
1139 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
1145 b->sysdata = sysdata;
1148 if (pci_find_bus(pci_domain_nr(b), bus)) {
1149 /* If we already got to this bus through a different bridge, ignore it */
1150 pr_debug("PCI: Bus %04x:%02x already known\n", pci_domain_nr(b), bus);
1154 down_write(&pci_bus_sem);
1155 list_add_tail(&b->node, &pci_root_buses);
1156 up_write(&pci_bus_sem);
1158 dev->parent = parent;
1159 dev->release = pci_release_bus_bridge_dev;
1160 dev_set_name(dev, "pci%04x:%02x", pci_domain_nr(b), bus);
1161 error = device_register(dev);
1164 b->bridge = get_device(dev);
1167 set_dev_node(b->bridge, pcibus_to_node(b));
1169 b->dev.class = &pcibus_class;
1170 b->dev.parent = b->bridge;
1171 dev_set_name(&b->dev, "%04x:%02x", pci_domain_nr(b), bus);
1172 error = device_register(&b->dev);
1174 goto class_dev_reg_err;
1175 error = device_create_file(&b->dev, &dev_attr_cpuaffinity);
1177 goto dev_create_file_err;
1179 /* Create legacy_io and legacy_mem files for this bus */
1180 pci_create_legacy_files(b);
1182 b->number = b->secondary = bus;
1183 b->resource[0] = &ioport_resource;
1184 b->resource[1] = &iomem_resource;
1186 set_pci_bus_resources_arch_default(b);
1190 dev_create_file_err:
1191 device_unregister(&b->dev);
1193 device_unregister(dev);
1195 down_write(&pci_bus_sem);
1197 up_write(&pci_bus_sem);
1204 struct pci_bus * __devinit pci_scan_bus_parented(struct device *parent,
1205 int bus, struct pci_ops *ops, void *sysdata)
1209 b = pci_create_bus(parent, bus, ops, sysdata);
1211 b->subordinate = pci_scan_child_bus(b);
1214 EXPORT_SYMBOL(pci_scan_bus_parented);
1216 #ifdef CONFIG_HOTPLUG
1217 EXPORT_SYMBOL(pci_add_new_bus);
1218 EXPORT_SYMBOL(pci_scan_slot);
1219 EXPORT_SYMBOL(pci_scan_bridge);
1220 EXPORT_SYMBOL_GPL(pci_scan_child_bus);
1223 static int __init pci_sort_bf_cmp(const struct device *d_a, const struct device *d_b)
1225 const struct pci_dev *a = to_pci_dev(d_a);
1226 const struct pci_dev *b = to_pci_dev(d_b);
1228 if (pci_domain_nr(a->bus) < pci_domain_nr(b->bus)) return -1;
1229 else if (pci_domain_nr(a->bus) > pci_domain_nr(b->bus)) return 1;
1231 if (a->bus->number < b->bus->number) return -1;
1232 else if (a->bus->number > b->bus->number) return 1;
1234 if (a->devfn < b->devfn) return -1;
1235 else if (a->devfn > b->devfn) return 1;
1240 void __init pci_sort_breadthfirst(void)
1242 bus_sort_breadthfirst(&pci_bus_type, &pci_sort_bf_cmp);