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,
56 cpumask = pcibus_to_cpumask(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)
139 pci_bar_unknown, /* Standard PCI BAR probe */
140 pci_bar_io, /* An io port BAR */
141 pci_bar_mem32, /* A 32-bit memory BAR */
142 pci_bar_mem64, /* A 64-bit memory BAR */
145 static inline enum pci_bar_type decode_bar(struct resource *res, u32 bar)
147 if ((bar & PCI_BASE_ADDRESS_SPACE) == PCI_BASE_ADDRESS_SPACE_IO) {
148 res->flags = bar & ~PCI_BASE_ADDRESS_IO_MASK;
152 res->flags = bar & ~PCI_BASE_ADDRESS_MEM_MASK;
154 if (res->flags & PCI_BASE_ADDRESS_MEM_TYPE_64)
155 return pci_bar_mem64;
156 return pci_bar_mem32;
160 * If the type is not unknown, we assume that the lowest bit is 'enable'.
161 * Returns 1 if the BAR was 64-bit and 0 if it was 32-bit.
163 static int __pci_read_base(struct pci_dev *dev, enum pci_bar_type type,
164 struct resource *res, unsigned int pos)
168 mask = type ? ~PCI_ROM_ADDRESS_ENABLE : ~0;
170 res->name = pci_name(dev);
172 pci_read_config_dword(dev, pos, &l);
173 pci_write_config_dword(dev, pos, mask);
174 pci_read_config_dword(dev, pos, &sz);
175 pci_write_config_dword(dev, pos, l);
178 * All bits set in sz means the device isn't working properly.
179 * If the BAR isn't implemented, all bits must be 0. If it's a
180 * memory BAR or a ROM, bit 0 must be clear; if it's an io BAR, bit
183 if (!sz || sz == 0xffffffff)
187 * I don't know how l can have all bits set. Copied from old code.
188 * Maybe it fixes a bug on some ancient platform.
193 if (type == pci_bar_unknown) {
194 type = decode_bar(res, l);
195 res->flags |= pci_calc_resource_flags(l) | IORESOURCE_SIZEALIGN;
196 if (type == pci_bar_io) {
197 l &= PCI_BASE_ADDRESS_IO_MASK;
198 mask = PCI_BASE_ADDRESS_IO_MASK & 0xffff;
200 l &= PCI_BASE_ADDRESS_MEM_MASK;
201 mask = (u32)PCI_BASE_ADDRESS_MEM_MASK;
204 res->flags |= (l & IORESOURCE_ROM_ENABLE);
205 l &= PCI_ROM_ADDRESS_MASK;
206 mask = (u32)PCI_ROM_ADDRESS_MASK;
209 if (type == pci_bar_mem64) {
212 u64 mask64 = mask | (u64)~0 << 32;
214 pci_read_config_dword(dev, pos + 4, &l);
215 pci_write_config_dword(dev, pos + 4, ~0);
216 pci_read_config_dword(dev, pos + 4, &sz);
217 pci_write_config_dword(dev, pos + 4, l);
219 l64 |= ((u64)l << 32);
220 sz64 |= ((u64)sz << 32);
222 sz64 = pci_size(l64, sz64, mask64);
227 if ((sizeof(resource_size_t) < 8) && (sz64 > 0x100000000ULL)) {
228 dev_err(&dev->dev, "can't handle 64-bit BAR\n");
230 } else if ((sizeof(resource_size_t) < 8) && l) {
231 /* Address above 32-bit boundary; disable the BAR */
232 pci_write_config_dword(dev, pos, 0);
233 pci_write_config_dword(dev, pos + 4, 0);
238 res->end = l64 + sz64;
239 dev_printk(KERN_DEBUG, &dev->dev,
240 "reg %x 64bit mmio: %pR\n", pos, res);
243 sz = pci_size(l, sz, mask);
251 dev_printk(KERN_DEBUG, &dev->dev, "reg %x %s: %pR\n", pos,
252 (res->flags & IORESOURCE_IO) ? "io port" : "32bit mmio",
257 return (type == pci_bar_mem64) ? 1 : 0;
263 static void pci_read_bases(struct pci_dev *dev, unsigned int howmany, int rom)
265 unsigned int pos, reg;
267 for (pos = 0; pos < howmany; pos++) {
268 struct resource *res = &dev->resource[pos];
269 reg = PCI_BASE_ADDRESS_0 + (pos << 2);
270 pos += __pci_read_base(dev, pci_bar_unknown, res, reg);
274 struct resource *res = &dev->resource[PCI_ROM_RESOURCE];
275 dev->rom_base_reg = rom;
276 res->flags = IORESOURCE_MEM | IORESOURCE_PREFETCH |
277 IORESOURCE_READONLY | IORESOURCE_CACHEABLE |
278 IORESOURCE_SIZEALIGN;
279 __pci_read_base(dev, pci_bar_mem32, res, rom);
283 void __devinit pci_read_bridge_bases(struct pci_bus *child)
285 struct pci_dev *dev = child->self;
286 u8 io_base_lo, io_limit_lo;
287 u16 mem_base_lo, mem_limit_lo;
288 unsigned long base, limit;
289 struct resource *res;
292 if (!dev) /* It's a host bus, nothing to read */
295 if (dev->transparent) {
296 dev_info(&dev->dev, "transparent bridge\n");
297 for(i = 3; i < PCI_BUS_NUM_RESOURCES; i++)
298 child->resource[i] = child->parent->resource[i - 3];
301 res = child->resource[0];
302 pci_read_config_byte(dev, PCI_IO_BASE, &io_base_lo);
303 pci_read_config_byte(dev, PCI_IO_LIMIT, &io_limit_lo);
304 base = (io_base_lo & PCI_IO_RANGE_MASK) << 8;
305 limit = (io_limit_lo & PCI_IO_RANGE_MASK) << 8;
307 if ((io_base_lo & PCI_IO_RANGE_TYPE_MASK) == PCI_IO_RANGE_TYPE_32) {
308 u16 io_base_hi, io_limit_hi;
309 pci_read_config_word(dev, PCI_IO_BASE_UPPER16, &io_base_hi);
310 pci_read_config_word(dev, PCI_IO_LIMIT_UPPER16, &io_limit_hi);
311 base |= (io_base_hi << 16);
312 limit |= (io_limit_hi << 16);
316 res->flags = (io_base_lo & PCI_IO_RANGE_TYPE_MASK) | IORESOURCE_IO;
320 res->end = limit + 0xfff;
321 dev_printk(KERN_DEBUG, &dev->dev, "bridge io port: %pR\n", res);
324 res = child->resource[1];
325 pci_read_config_word(dev, PCI_MEMORY_BASE, &mem_base_lo);
326 pci_read_config_word(dev, PCI_MEMORY_LIMIT, &mem_limit_lo);
327 base = (mem_base_lo & PCI_MEMORY_RANGE_MASK) << 16;
328 limit = (mem_limit_lo & PCI_MEMORY_RANGE_MASK) << 16;
330 res->flags = (mem_base_lo & PCI_MEMORY_RANGE_TYPE_MASK) | IORESOURCE_MEM;
332 res->end = limit + 0xfffff;
333 dev_printk(KERN_DEBUG, &dev->dev, "bridge 32bit mmio: %pR\n",
337 res = child->resource[2];
338 pci_read_config_word(dev, PCI_PREF_MEMORY_BASE, &mem_base_lo);
339 pci_read_config_word(dev, PCI_PREF_MEMORY_LIMIT, &mem_limit_lo);
340 base = (mem_base_lo & PCI_PREF_RANGE_MASK) << 16;
341 limit = (mem_limit_lo & PCI_PREF_RANGE_MASK) << 16;
343 if ((mem_base_lo & PCI_PREF_RANGE_TYPE_MASK) == PCI_PREF_RANGE_TYPE_64) {
344 u32 mem_base_hi, mem_limit_hi;
345 pci_read_config_dword(dev, PCI_PREF_BASE_UPPER32, &mem_base_hi);
346 pci_read_config_dword(dev, PCI_PREF_LIMIT_UPPER32, &mem_limit_hi);
349 * Some bridges set the base > limit by default, and some
350 * (broken) BIOSes do not initialize them. If we find
351 * this, just assume they are not being used.
353 if (mem_base_hi <= mem_limit_hi) {
354 #if BITS_PER_LONG == 64
355 base |= ((long) mem_base_hi) << 32;
356 limit |= ((long) mem_limit_hi) << 32;
358 if (mem_base_hi || mem_limit_hi) {
359 dev_err(&dev->dev, "can't handle 64-bit "
360 "address space for bridge\n");
367 res->flags = (mem_base_lo & PCI_MEMORY_RANGE_TYPE_MASK) | IORESOURCE_MEM | IORESOURCE_PREFETCH;
369 res->end = limit + 0xfffff;
370 dev_printk(KERN_DEBUG, &dev->dev, "bridge %sbit mmio pref: %pR\n",
371 (res->flags & PCI_PREF_RANGE_TYPE_64) ? "64" : "32",
376 static struct pci_bus * pci_alloc_bus(void)
380 b = kzalloc(sizeof(*b), GFP_KERNEL);
382 INIT_LIST_HEAD(&b->node);
383 INIT_LIST_HEAD(&b->children);
384 INIT_LIST_HEAD(&b->devices);
385 INIT_LIST_HEAD(&b->slots);
390 static struct pci_bus *pci_alloc_child_bus(struct pci_bus *parent,
391 struct pci_dev *bridge, int busnr)
393 struct pci_bus *child;
397 * Allocate a new bus, and inherit stuff from the parent..
399 child = pci_alloc_bus();
403 child->self = bridge;
404 child->parent = parent;
405 child->ops = parent->ops;
406 child->sysdata = parent->sysdata;
407 child->bus_flags = parent->bus_flags;
408 child->bridge = get_device(&bridge->dev);
410 /* initialize some portions of the bus device, but don't register it
411 * now as the parent is not properly set up yet. This device will get
412 * registered later in pci_bus_add_devices()
414 child->dev.class = &pcibus_class;
415 sprintf(child->dev.bus_id, "%04x:%02x", pci_domain_nr(child), busnr);
418 * Set up the primary, secondary and subordinate
421 child->number = child->secondary = busnr;
422 child->primary = parent->secondary;
423 child->subordinate = 0xff;
425 /* Set up default resource pointers and names.. */
426 for (i = 0; i < 4; i++) {
427 child->resource[i] = &bridge->resource[PCI_BRIDGE_RESOURCES+i];
428 child->resource[i]->name = child->name;
430 bridge->subordinate = child;
435 struct pci_bus *__ref pci_add_new_bus(struct pci_bus *parent, struct pci_dev *dev, int busnr)
437 struct pci_bus *child;
439 child = pci_alloc_child_bus(parent, dev, busnr);
441 down_write(&pci_bus_sem);
442 list_add_tail(&child->node, &parent->children);
443 up_write(&pci_bus_sem);
448 static void pci_fixup_parent_subordinate_busnr(struct pci_bus *child, int max)
450 struct pci_bus *parent = child->parent;
452 /* Attempts to fix that up are really dangerous unless
453 we're going to re-assign all bus numbers. */
454 if (!pcibios_assign_all_busses())
457 while (parent->parent && parent->subordinate < max) {
458 parent->subordinate = max;
459 pci_write_config_byte(parent->self, PCI_SUBORDINATE_BUS, max);
460 parent = parent->parent;
465 * If it's a bridge, configure it and scan the bus behind it.
466 * For CardBus bridges, we don't scan behind as the devices will
467 * be handled by the bridge driver itself.
469 * We need to process bridges in two passes -- first we scan those
470 * already configured by the BIOS and after we are done with all of
471 * them, we proceed to assigning numbers to the remaining buses in
472 * order to avoid overlaps between old and new bus numbers.
474 int __devinit pci_scan_bridge(struct pci_bus *bus, struct pci_dev *dev, int max, int pass)
476 struct pci_bus *child;
477 int is_cardbus = (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS);
482 pci_read_config_dword(dev, PCI_PRIMARY_BUS, &buses);
484 dev_dbg(&dev->dev, "scanning behind bridge, config %06x, pass %d\n",
485 buses & 0xffffff, pass);
487 /* Check if setup is sensible at all */
489 ((buses & 0xff) != bus->number || ((buses >> 8) & 0xff) <= bus->number)) {
490 dev_dbg(&dev->dev, "bus configuration invalid, reconfiguring\n");
494 /* Disable MasterAbortMode during probing to avoid reporting
495 of bus errors (in some architectures) */
496 pci_read_config_word(dev, PCI_BRIDGE_CONTROL, &bctl);
497 pci_write_config_word(dev, PCI_BRIDGE_CONTROL,
498 bctl & ~PCI_BRIDGE_CTL_MASTER_ABORT);
500 if ((buses & 0xffff00) && !pcibios_assign_all_busses() && !is_cardbus && !broken) {
501 unsigned int cmax, busnr;
503 * Bus already configured by firmware, process it in the first
504 * pass and just note the configuration.
508 busnr = (buses >> 8) & 0xFF;
511 * If we already got to this bus through a different bridge,
512 * ignore it. This can happen with the i450NX chipset.
514 if (pci_find_bus(pci_domain_nr(bus), busnr)) {
515 dev_info(&dev->dev, "bus %04x:%02x already known\n",
516 pci_domain_nr(bus), busnr);
520 child = pci_add_new_bus(bus, dev, busnr);
523 child->primary = buses & 0xFF;
524 child->subordinate = (buses >> 16) & 0xFF;
525 child->bridge_ctl = bctl;
527 cmax = pci_scan_child_bus(child);
530 if (child->subordinate > max)
531 max = child->subordinate;
534 * We need to assign a number to this bus which we always
535 * do in the second pass.
538 if (pcibios_assign_all_busses() || broken)
539 /* Temporarily disable forwarding of the
540 configuration cycles on all bridges in
541 this bus segment to avoid possible
542 conflicts in the second pass between two
543 bridges programmed with overlapping
545 pci_write_config_dword(dev, PCI_PRIMARY_BUS,
551 pci_write_config_word(dev, PCI_STATUS, 0xffff);
553 /* Prevent assigning a bus number that already exists.
554 * This can happen when a bridge is hot-plugged */
555 if (pci_find_bus(pci_domain_nr(bus), max+1))
557 child = pci_add_new_bus(bus, dev, ++max);
558 buses = (buses & 0xff000000)
559 | ((unsigned int)(child->primary) << 0)
560 | ((unsigned int)(child->secondary) << 8)
561 | ((unsigned int)(child->subordinate) << 16);
564 * yenta.c forces a secondary latency timer of 176.
565 * Copy that behaviour here.
568 buses &= ~0xff000000;
569 buses |= CARDBUS_LATENCY_TIMER << 24;
573 * We need to blast all three values with a single write.
575 pci_write_config_dword(dev, PCI_PRIMARY_BUS, buses);
578 child->bridge_ctl = bctl;
580 * Adjust subordinate busnr in parent buses.
581 * We do this before scanning for children because
582 * some devices may not be detected if the bios
585 pci_fixup_parent_subordinate_busnr(child, max);
586 /* Now we can scan all subordinate buses... */
587 max = pci_scan_child_bus(child);
589 * now fix it up again since we have found
590 * the real value of max.
592 pci_fixup_parent_subordinate_busnr(child, max);
595 * For CardBus bridges, we leave 4 bus numbers
596 * as cards with a PCI-to-PCI bridge can be
599 for (i=0; i<CARDBUS_RESERVE_BUSNR; i++) {
600 struct pci_bus *parent = bus;
601 if (pci_find_bus(pci_domain_nr(bus),
604 while (parent->parent) {
605 if ((!pcibios_assign_all_busses()) &&
606 (parent->subordinate > max) &&
607 (parent->subordinate <= max+i)) {
610 parent = parent->parent;
614 * Often, there are two cardbus bridges
615 * -- try to leave one valid bus number
623 pci_fixup_parent_subordinate_busnr(child, max);
626 * Set the subordinate bus number to its real value.
628 child->subordinate = max;
629 pci_write_config_byte(dev, PCI_SUBORDINATE_BUS, max);
633 (is_cardbus ? "PCI CardBus %04x:%02x" : "PCI Bus %04x:%02x"),
634 pci_domain_nr(bus), child->number);
636 /* Has only triggered on CardBus, fixup is in yenta_socket */
637 while (bus->parent) {
638 if ((child->subordinate > bus->subordinate) ||
639 (child->number > bus->subordinate) ||
640 (child->number < bus->number) ||
641 (child->subordinate < bus->number)) {
642 pr_debug("PCI: Bus #%02x (-#%02x) is %s "
643 "hidden behind%s bridge #%02x (-#%02x)\n",
644 child->number, child->subordinate,
645 (bus->number > child->subordinate &&
646 bus->subordinate < child->number) ?
647 "wholly" : "partially",
648 bus->self->transparent ? " transparent" : "",
649 bus->number, bus->subordinate);
655 pci_write_config_word(dev, PCI_BRIDGE_CONTROL, bctl);
661 * Read interrupt line and base address registers.
662 * The architecture-dependent code can tweak these, of course.
664 static void pci_read_irq(struct pci_dev *dev)
668 pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &irq);
671 pci_read_config_byte(dev, PCI_INTERRUPT_LINE, &irq);
675 #define LEGACY_IO_RESOURCE (IORESOURCE_IO | IORESOURCE_PCI_FIXED)
678 * pci_setup_device - fill in class and map information of a device
679 * @dev: the device structure to fill
681 * Initialize the device structure with information about the device's
682 * vendor,class,memory and IO-space addresses,IRQ lines etc.
683 * Called at initialisation of the PCI subsystem and by CardBus services.
684 * Returns 0 on success and -1 if unknown type of device (not normal, bridge
687 static int pci_setup_device(struct pci_dev * dev)
691 dev_set_name(&dev->dev, "%04x:%02x:%02x.%d", pci_domain_nr(dev->bus),
692 dev->bus->number, PCI_SLOT(dev->devfn),
693 PCI_FUNC(dev->devfn));
695 pci_read_config_dword(dev, PCI_CLASS_REVISION, &class);
696 dev->revision = class & 0xff;
697 class >>= 8; /* upper 3 bytes */
701 dev_dbg(&dev->dev, "found [%04x:%04x] class %06x header type %02x\n",
702 dev->vendor, dev->device, class, dev->hdr_type);
704 /* "Unknown power state" */
705 dev->current_state = PCI_UNKNOWN;
707 /* Early fixups, before probing the BARs */
708 pci_fixup_device(pci_fixup_early, dev);
709 class = dev->class >> 8;
711 switch (dev->hdr_type) { /* header type */
712 case PCI_HEADER_TYPE_NORMAL: /* standard header */
713 if (class == PCI_CLASS_BRIDGE_PCI)
716 pci_read_bases(dev, 6, PCI_ROM_ADDRESS);
717 pci_read_config_word(dev, PCI_SUBSYSTEM_VENDOR_ID, &dev->subsystem_vendor);
718 pci_read_config_word(dev, PCI_SUBSYSTEM_ID, &dev->subsystem_device);
721 * Do the ugly legacy mode stuff here rather than broken chip
722 * quirk code. Legacy mode ATA controllers have fixed
723 * addresses. These are not always echoed in BAR0-3, and
724 * BAR0-3 in a few cases contain junk!
726 if (class == PCI_CLASS_STORAGE_IDE) {
728 pci_read_config_byte(dev, PCI_CLASS_PROG, &progif);
729 if ((progif & 1) == 0) {
730 dev->resource[0].start = 0x1F0;
731 dev->resource[0].end = 0x1F7;
732 dev->resource[0].flags = LEGACY_IO_RESOURCE;
733 dev->resource[1].start = 0x3F6;
734 dev->resource[1].end = 0x3F6;
735 dev->resource[1].flags = LEGACY_IO_RESOURCE;
737 if ((progif & 4) == 0) {
738 dev->resource[2].start = 0x170;
739 dev->resource[2].end = 0x177;
740 dev->resource[2].flags = LEGACY_IO_RESOURCE;
741 dev->resource[3].start = 0x376;
742 dev->resource[3].end = 0x376;
743 dev->resource[3].flags = LEGACY_IO_RESOURCE;
748 case PCI_HEADER_TYPE_BRIDGE: /* bridge header */
749 if (class != PCI_CLASS_BRIDGE_PCI)
751 /* The PCI-to-PCI bridge spec requires that subtractive
752 decoding (i.e. transparent) bridge must have programming
753 interface code of 0x01. */
755 dev->transparent = ((dev->class & 0xff) == 1);
756 pci_read_bases(dev, 2, PCI_ROM_ADDRESS1);
759 case PCI_HEADER_TYPE_CARDBUS: /* CardBus bridge header */
760 if (class != PCI_CLASS_BRIDGE_CARDBUS)
763 pci_read_bases(dev, 1, 0);
764 pci_read_config_word(dev, PCI_CB_SUBSYSTEM_VENDOR_ID, &dev->subsystem_vendor);
765 pci_read_config_word(dev, PCI_CB_SUBSYSTEM_ID, &dev->subsystem_device);
768 default: /* unknown header */
769 dev_err(&dev->dev, "unknown header type %02x, "
770 "ignoring device\n", dev->hdr_type);
774 dev_err(&dev->dev, "ignoring class %02x (doesn't match header "
775 "type %02x)\n", class, dev->hdr_type);
776 dev->class = PCI_CLASS_NOT_DEFINED;
779 /* We found a fine healthy device, go go go... */
783 static void pci_release_capabilities(struct pci_dev *dev)
785 pci_vpd_release(dev);
789 * pci_release_dev - free a pci device structure when all users of it are finished.
790 * @dev: device that's been disconnected
792 * Will be called only by the device core when all users of this pci device are
795 static void pci_release_dev(struct device *dev)
797 struct pci_dev *pci_dev;
799 pci_dev = to_pci_dev(dev);
800 pci_release_capabilities(pci_dev);
804 static void set_pcie_port_type(struct pci_dev *pdev)
809 pos = pci_find_capability(pdev, PCI_CAP_ID_EXP);
813 pci_read_config_word(pdev, pos + PCI_EXP_FLAGS, ®16);
814 pdev->pcie_type = (reg16 & PCI_EXP_FLAGS_TYPE) >> 4;
818 * pci_cfg_space_size - get the configuration space size of the PCI device.
821 * Regular PCI devices have 256 bytes, but PCI-X 2 and PCI Express devices
822 * have 4096 bytes. Even if the device is capable, that doesn't mean we can
823 * access it. Maybe we don't have a way to generate extended config space
824 * accesses, or the device is behind a reverse Express bridge. So we try
825 * reading the dword at 0x100 which must either be 0 or a valid extended
828 int pci_cfg_space_size_ext(struct pci_dev *dev)
831 int pos = PCI_CFG_SPACE_SIZE;
833 if (pci_read_config_dword(dev, pos, &status) != PCIBIOS_SUCCESSFUL)
835 if (status == 0xffffffff)
838 return PCI_CFG_SPACE_EXP_SIZE;
841 return PCI_CFG_SPACE_SIZE;
844 int pci_cfg_space_size(struct pci_dev *dev)
849 pos = pci_find_capability(dev, PCI_CAP_ID_EXP);
851 pos = pci_find_capability(dev, PCI_CAP_ID_PCIX);
855 pci_read_config_dword(dev, pos + PCI_X_STATUS, &status);
856 if (!(status & (PCI_X_STATUS_266MHZ | PCI_X_STATUS_533MHZ)))
860 return pci_cfg_space_size_ext(dev);
863 return PCI_CFG_SPACE_SIZE;
866 static void pci_release_bus_bridge_dev(struct device *dev)
871 struct pci_dev *alloc_pci_dev(void)
875 dev = kzalloc(sizeof(struct pci_dev), GFP_KERNEL);
879 INIT_LIST_HEAD(&dev->bus_list);
883 EXPORT_SYMBOL(alloc_pci_dev);
886 * Read the config data for a PCI device, sanity-check it
887 * and fill in the dev structure...
889 static struct pci_dev *pci_scan_device(struct pci_bus *bus, int devfn)
892 struct pci_slot *slot;
897 if (pci_bus_read_config_dword(bus, devfn, PCI_VENDOR_ID, &l))
900 /* some broken boards return 0 or ~0 if a slot is empty: */
901 if (l == 0xffffffff || l == 0x00000000 ||
902 l == 0x0000ffff || l == 0xffff0000)
905 /* Configuration request Retry Status */
906 while (l == 0xffff0001) {
909 if (pci_bus_read_config_dword(bus, devfn, PCI_VENDOR_ID, &l))
911 /* Card hasn't responded in 60 seconds? Must be stuck. */
912 if (delay > 60 * 1000) {
913 printk(KERN_WARNING "pci %04x:%02x:%02x.%d: not "
914 "responding\n", pci_domain_nr(bus),
915 bus->number, PCI_SLOT(devfn),
921 if (pci_bus_read_config_byte(bus, devfn, PCI_HEADER_TYPE, &hdr_type))
924 dev = alloc_pci_dev();
929 dev->sysdata = bus->sysdata;
930 dev->dev.parent = bus->bridge;
931 dev->dev.bus = &pci_bus_type;
933 dev->hdr_type = hdr_type & 0x7f;
934 dev->multifunction = !!(hdr_type & 0x80);
935 dev->vendor = l & 0xffff;
936 dev->device = (l >> 16) & 0xffff;
937 dev->cfg_size = pci_cfg_space_size(dev);
938 dev->error_state = pci_channel_io_normal;
939 set_pcie_port_type(dev);
941 list_for_each_entry(slot, &bus->slots, list)
942 if (PCI_SLOT(devfn) == slot->number)
945 /* Assume 32-bit PCI; let 64-bit PCI cards (which are far rarer)
946 set this higher, assuming the system even supports it. */
947 dev->dma_mask = 0xffffffff;
948 if (pci_setup_device(dev) < 0) {
956 static void pci_init_capabilities(struct pci_dev *dev)
959 pci_msi_init_pci_dev(dev);
961 /* Power Management */
964 /* Vital Product Data */
965 pci_vpd_pci22_init(dev);
967 /* Alternative Routing-ID Forwarding */
971 void pci_device_add(struct pci_dev *dev, struct pci_bus *bus)
973 device_initialize(&dev->dev);
974 dev->dev.release = pci_release_dev;
977 dev->dev.dma_mask = &dev->dma_mask;
978 dev->dev.dma_parms = &dev->dma_parms;
979 dev->dev.coherent_dma_mask = 0xffffffffull;
981 pci_set_dma_max_seg_size(dev, 65536);
982 pci_set_dma_seg_boundary(dev, 0xffffffff);
984 /* Fix up broken headers */
985 pci_fixup_device(pci_fixup_header, dev);
987 /* Initialize various capabilities */
988 pci_init_capabilities(dev);
991 * Add the device to our list of discovered devices
992 * and the bus list for fixup functions, etc.
994 down_write(&pci_bus_sem);
995 list_add_tail(&dev->bus_list, &bus->devices);
996 up_write(&pci_bus_sem);
999 struct pci_dev *__ref pci_scan_single_device(struct pci_bus *bus, int devfn)
1001 struct pci_dev *dev;
1003 dev = pci_scan_device(bus, devfn);
1007 pci_device_add(dev, bus);
1011 EXPORT_SYMBOL(pci_scan_single_device);
1014 * pci_scan_slot - scan a PCI slot on a bus for devices.
1015 * @bus: PCI bus to scan
1016 * @devfn: slot number to scan (must have zero function.)
1018 * Scan a PCI slot on the specified PCI bus for devices, adding
1019 * discovered devices to the @bus->devices list. New devices
1020 * will not have is_added set.
1022 int pci_scan_slot(struct pci_bus *bus, int devfn)
1027 scan_all_fns = pcibios_scan_all_fns(bus, devfn);
1029 for (func = 0; func < 8; func++, devfn++) {
1030 struct pci_dev *dev;
1032 dev = pci_scan_single_device(bus, devfn);
1037 * If this is a single function device,
1038 * don't scan past the first function.
1040 if (!dev->multifunction) {
1042 dev->multifunction = 1;
1048 if (func == 0 && !scan_all_fns)
1053 /* only one slot has pcie device */
1054 if (bus->self && nr)
1055 pcie_aspm_init_link_state(bus->self);
1060 unsigned int __devinit pci_scan_child_bus(struct pci_bus *bus)
1062 unsigned int devfn, pass, max = bus->secondary;
1063 struct pci_dev *dev;
1065 pr_debug("PCI: Scanning bus %04x:%02x\n", pci_domain_nr(bus), bus->number);
1067 /* Go find them, Rover! */
1068 for (devfn = 0; devfn < 0x100; devfn += 8)
1069 pci_scan_slot(bus, devfn);
1072 * After performing arch-dependent fixup of the bus, look behind
1073 * all PCI-to-PCI bridges on this bus.
1075 pr_debug("PCI: Fixups for bus %04x:%02x\n", pci_domain_nr(bus), bus->number);
1076 pcibios_fixup_bus(bus);
1077 for (pass=0; pass < 2; pass++)
1078 list_for_each_entry(dev, &bus->devices, bus_list) {
1079 if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE ||
1080 dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)
1081 max = pci_scan_bridge(bus, dev, max, pass);
1085 * We've scanned the bus and so we know all about what's on
1086 * the other side of any bridges that may be on this bus plus
1089 * Return how far we've got finding sub-buses.
1091 pr_debug("PCI: Bus scan for %04x:%02x returning with max=%02x\n",
1092 pci_domain_nr(bus), bus->number, max);
1096 void __attribute__((weak)) set_pci_bus_resources_arch_default(struct pci_bus *b)
1100 struct pci_bus * pci_create_bus(struct device *parent,
1101 int bus, struct pci_ops *ops, void *sysdata)
1107 b = pci_alloc_bus();
1111 dev = kmalloc(sizeof(*dev), GFP_KERNEL);
1117 b->sysdata = sysdata;
1120 if (pci_find_bus(pci_domain_nr(b), bus)) {
1121 /* If we already got to this bus through a different bridge, ignore it */
1122 pr_debug("PCI: Bus %04x:%02x already known\n", pci_domain_nr(b), bus);
1126 down_write(&pci_bus_sem);
1127 list_add_tail(&b->node, &pci_root_buses);
1128 up_write(&pci_bus_sem);
1130 memset(dev, 0, sizeof(*dev));
1131 dev->parent = parent;
1132 dev->release = pci_release_bus_bridge_dev;
1133 sprintf(dev->bus_id, "pci%04x:%02x", pci_domain_nr(b), bus);
1134 error = device_register(dev);
1137 b->bridge = get_device(dev);
1140 set_dev_node(b->bridge, pcibus_to_node(b));
1142 b->dev.class = &pcibus_class;
1143 b->dev.parent = b->bridge;
1144 sprintf(b->dev.bus_id, "%04x:%02x", pci_domain_nr(b), bus);
1145 error = device_register(&b->dev);
1147 goto class_dev_reg_err;
1148 error = device_create_file(&b->dev, &dev_attr_cpuaffinity);
1150 goto dev_create_file_err;
1152 /* Create legacy_io and legacy_mem files for this bus */
1153 pci_create_legacy_files(b);
1155 b->number = b->secondary = bus;
1156 b->resource[0] = &ioport_resource;
1157 b->resource[1] = &iomem_resource;
1159 set_pci_bus_resources_arch_default(b);
1163 dev_create_file_err:
1164 device_unregister(&b->dev);
1166 device_unregister(dev);
1168 down_write(&pci_bus_sem);
1170 up_write(&pci_bus_sem);
1177 struct pci_bus * __devinit pci_scan_bus_parented(struct device *parent,
1178 int bus, struct pci_ops *ops, void *sysdata)
1182 b = pci_create_bus(parent, bus, ops, sysdata);
1184 b->subordinate = pci_scan_child_bus(b);
1187 EXPORT_SYMBOL(pci_scan_bus_parented);
1189 #ifdef CONFIG_HOTPLUG
1190 EXPORT_SYMBOL(pci_add_new_bus);
1191 EXPORT_SYMBOL(pci_scan_slot);
1192 EXPORT_SYMBOL(pci_scan_bridge);
1193 EXPORT_SYMBOL_GPL(pci_scan_child_bus);
1196 static int __init pci_sort_bf_cmp(const struct device *d_a, const struct device *d_b)
1198 const struct pci_dev *a = to_pci_dev(d_a);
1199 const struct pci_dev *b = to_pci_dev(d_b);
1201 if (pci_domain_nr(a->bus) < pci_domain_nr(b->bus)) return -1;
1202 else if (pci_domain_nr(a->bus) > pci_domain_nr(b->bus)) return 1;
1204 if (a->bus->number < b->bus->number) return -1;
1205 else if (a->bus->number > b->bus->number) return 1;
1207 if (a->devfn < b->devfn) return -1;
1208 else if (a->devfn > b->devfn) return 1;
1213 void __init pci_sort_breadthfirst(void)
1215 bus_sort_breadthfirst(&pci_bus_type, &pci_sort_bf_cmp);