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 * On error unwind, but don't propogate the error to the caller
57 * as it is ok to set up the PCI bus without these files.
59 static void pci_create_legacy_files(struct pci_bus *b)
63 b->legacy_io = kzalloc(sizeof(struct bin_attribute) * 2,
68 b->legacy_io->attr.name = "legacy_io";
69 b->legacy_io->size = 0xffff;
70 b->legacy_io->attr.mode = S_IRUSR | S_IWUSR;
71 b->legacy_io->read = pci_read_legacy_io;
72 b->legacy_io->write = pci_write_legacy_io;
73 error = device_create_bin_file(&b->dev, b->legacy_io);
77 /* Allocated above after the legacy_io struct */
78 b->legacy_mem = b->legacy_io + 1;
79 b->legacy_mem->attr.name = "legacy_mem";
80 b->legacy_mem->size = 1024*1024;
81 b->legacy_mem->attr.mode = S_IRUSR | S_IWUSR;
82 b->legacy_mem->mmap = pci_mmap_legacy_mem;
83 error = device_create_bin_file(&b->dev, b->legacy_mem);
90 device_remove_bin_file(&b->dev, b->legacy_io);
95 printk(KERN_WARNING "pci: warning: could not create legacy I/O port "
96 "and ISA memory resources to sysfs\n");
100 void pci_remove_legacy_files(struct pci_bus *b)
103 device_remove_bin_file(&b->dev, b->legacy_io);
104 device_remove_bin_file(&b->dev, b->legacy_mem);
105 kfree(b->legacy_io); /* both are allocated here */
108 #else /* !HAVE_PCI_LEGACY */
109 static inline void pci_create_legacy_files(struct pci_bus *bus) { return; }
110 void pci_remove_legacy_files(struct pci_bus *bus) { return; }
111 #endif /* HAVE_PCI_LEGACY */
114 * PCI Bus Class Devices
116 static ssize_t pci_bus_show_cpuaffinity(struct device *dev,
118 struct device_attribute *attr,
124 cpumask = pcibus_to_cpumask(to_pci_bus(dev));
126 cpulist_scnprintf(buf, PAGE_SIZE-2, cpumask):
127 cpumask_scnprintf(buf, PAGE_SIZE-2, cpumask);
133 static ssize_t inline pci_bus_show_cpumaskaffinity(struct device *dev,
134 struct device_attribute *attr,
137 return pci_bus_show_cpuaffinity(dev, 0, attr, buf);
140 static ssize_t inline pci_bus_show_cpulistaffinity(struct device *dev,
141 struct device_attribute *attr,
144 return pci_bus_show_cpuaffinity(dev, 1, attr, buf);
147 DEVICE_ATTR(cpuaffinity, S_IRUGO, pci_bus_show_cpumaskaffinity, NULL);
148 DEVICE_ATTR(cpulistaffinity, S_IRUGO, pci_bus_show_cpulistaffinity, NULL);
153 static void release_pcibus_dev(struct device *dev)
155 struct pci_bus *pci_bus = to_pci_bus(dev);
158 put_device(pci_bus->bridge);
162 static struct class pcibus_class = {
164 .dev_release = &release_pcibus_dev,
167 static int __init pcibus_class_init(void)
169 return class_register(&pcibus_class);
171 postcore_initcall(pcibus_class_init);
174 * Translate the low bits of the PCI base
175 * to the resource type
177 static inline unsigned int pci_calc_resource_flags(unsigned int flags)
179 if (flags & PCI_BASE_ADDRESS_SPACE_IO)
180 return IORESOURCE_IO;
182 if (flags & PCI_BASE_ADDRESS_MEM_PREFETCH)
183 return IORESOURCE_MEM | IORESOURCE_PREFETCH;
185 return IORESOURCE_MEM;
188 static u64 pci_size(u64 base, u64 maxbase, u64 mask)
190 u64 size = mask & maxbase; /* Find the significant bits */
194 /* Get the lowest of them to find the decode size, and
195 from that the extent. */
196 size = (size & ~(size-1)) - 1;
198 /* base == maxbase can be valid only if the BAR has
199 already been programmed with all 1s. */
200 if (base == maxbase && ((base | size) & mask) != mask)
207 pci_bar_unknown, /* Standard PCI BAR probe */
208 pci_bar_io, /* An io port BAR */
209 pci_bar_mem32, /* A 32-bit memory BAR */
210 pci_bar_mem64, /* A 64-bit memory BAR */
213 static inline enum pci_bar_type decode_bar(struct resource *res, u32 bar)
215 if ((bar & PCI_BASE_ADDRESS_SPACE) == PCI_BASE_ADDRESS_SPACE_IO) {
216 res->flags = bar & ~PCI_BASE_ADDRESS_IO_MASK;
220 res->flags = bar & ~PCI_BASE_ADDRESS_MEM_MASK;
222 if (res->flags == PCI_BASE_ADDRESS_MEM_TYPE_64)
223 return pci_bar_mem64;
224 return pci_bar_mem32;
228 * If the type is not unknown, we assume that the lowest bit is 'enable'.
229 * Returns 1 if the BAR was 64-bit and 0 if it was 32-bit.
231 static int __pci_read_base(struct pci_dev *dev, enum pci_bar_type type,
232 struct resource *res, unsigned int pos)
236 mask = type ? ~PCI_ROM_ADDRESS_ENABLE : ~0;
238 res->name = pci_name(dev);
240 pci_read_config_dword(dev, pos, &l);
241 pci_write_config_dword(dev, pos, mask);
242 pci_read_config_dword(dev, pos, &sz);
243 pci_write_config_dword(dev, pos, l);
246 * All bits set in sz means the device isn't working properly.
247 * If the BAR isn't implemented, all bits must be 0. If it's a
248 * memory BAR or a ROM, bit 0 must be clear; if it's an io BAR, bit
251 if (!sz || sz == 0xffffffff)
255 * I don't know how l can have all bits set. Copied from old code.
256 * Maybe it fixes a bug on some ancient platform.
261 if (type == pci_bar_unknown) {
262 type = decode_bar(res, l);
263 res->flags |= pci_calc_resource_flags(l) | IORESOURCE_SIZEALIGN;
264 if (type == pci_bar_io) {
265 l &= PCI_BASE_ADDRESS_IO_MASK;
266 mask = PCI_BASE_ADDRESS_IO_MASK & 0xffff;
268 l &= PCI_BASE_ADDRESS_MEM_MASK;
269 mask = (u32)PCI_BASE_ADDRESS_MEM_MASK;
272 res->flags |= (l & IORESOURCE_ROM_ENABLE);
273 l &= PCI_ROM_ADDRESS_MASK;
274 mask = (u32)PCI_ROM_ADDRESS_MASK;
277 if (type == pci_bar_mem64) {
280 u64 mask64 = mask | (u64)~0 << 32;
282 pci_read_config_dword(dev, pos + 4, &l);
283 pci_write_config_dword(dev, pos + 4, ~0);
284 pci_read_config_dword(dev, pos + 4, &sz);
285 pci_write_config_dword(dev, pos + 4, l);
287 l64 |= ((u64)l << 32);
288 sz64 |= ((u64)sz << 32);
290 sz64 = pci_size(l64, sz64, mask64);
295 if ((sizeof(resource_size_t) < 8) && (sz64 > 0x100000000ULL)) {
296 dev_err(&dev->dev, "can't handle 64-bit BAR\n");
298 } else if ((sizeof(resource_size_t) < 8) && l) {
299 /* Address above 32-bit boundary; disable the BAR */
300 pci_write_config_dword(dev, pos, 0);
301 pci_write_config_dword(dev, pos + 4, 0);
306 res->end = l64 + sz64;
309 sz = pci_size(l, sz, mask);
319 return (type == pci_bar_mem64) ? 1 : 0;
325 static void pci_read_bases(struct pci_dev *dev, unsigned int howmany, int rom)
327 unsigned int pos, reg;
329 for (pos = 0; pos < howmany; pos++) {
330 struct resource *res = &dev->resource[pos];
331 reg = PCI_BASE_ADDRESS_0 + (pos << 2);
332 pos += __pci_read_base(dev, pci_bar_unknown, res, reg);
336 struct resource *res = &dev->resource[PCI_ROM_RESOURCE];
337 dev->rom_base_reg = rom;
338 res->flags = IORESOURCE_MEM | IORESOURCE_PREFETCH |
339 IORESOURCE_READONLY | IORESOURCE_CACHEABLE |
340 IORESOURCE_SIZEALIGN;
341 __pci_read_base(dev, pci_bar_mem32, res, rom);
345 void __devinit pci_read_bridge_bases(struct pci_bus *child)
347 struct pci_dev *dev = child->self;
348 u8 io_base_lo, io_limit_lo;
349 u16 mem_base_lo, mem_limit_lo;
350 unsigned long base, limit;
351 struct resource *res;
354 if (!dev) /* It's a host bus, nothing to read */
357 if (dev->transparent) {
358 dev_info(&dev->dev, "transparent bridge\n");
359 for(i = 3; i < PCI_BUS_NUM_RESOURCES; i++)
360 child->resource[i] = child->parent->resource[i - 3];
364 child->resource[i] = &dev->resource[PCI_BRIDGE_RESOURCES+i];
366 res = child->resource[0];
367 pci_read_config_byte(dev, PCI_IO_BASE, &io_base_lo);
368 pci_read_config_byte(dev, PCI_IO_LIMIT, &io_limit_lo);
369 base = (io_base_lo & PCI_IO_RANGE_MASK) << 8;
370 limit = (io_limit_lo & PCI_IO_RANGE_MASK) << 8;
372 if ((io_base_lo & PCI_IO_RANGE_TYPE_MASK) == PCI_IO_RANGE_TYPE_32) {
373 u16 io_base_hi, io_limit_hi;
374 pci_read_config_word(dev, PCI_IO_BASE_UPPER16, &io_base_hi);
375 pci_read_config_word(dev, PCI_IO_LIMIT_UPPER16, &io_limit_hi);
376 base |= (io_base_hi << 16);
377 limit |= (io_limit_hi << 16);
381 res->flags = (io_base_lo & PCI_IO_RANGE_TYPE_MASK) | IORESOURCE_IO;
385 res->end = limit + 0xfff;
388 res = child->resource[1];
389 pci_read_config_word(dev, PCI_MEMORY_BASE, &mem_base_lo);
390 pci_read_config_word(dev, PCI_MEMORY_LIMIT, &mem_limit_lo);
391 base = (mem_base_lo & PCI_MEMORY_RANGE_MASK) << 16;
392 limit = (mem_limit_lo & PCI_MEMORY_RANGE_MASK) << 16;
394 res->flags = (mem_base_lo & PCI_MEMORY_RANGE_TYPE_MASK) | IORESOURCE_MEM;
396 res->end = limit + 0xfffff;
399 res = child->resource[2];
400 pci_read_config_word(dev, PCI_PREF_MEMORY_BASE, &mem_base_lo);
401 pci_read_config_word(dev, PCI_PREF_MEMORY_LIMIT, &mem_limit_lo);
402 base = (mem_base_lo & PCI_PREF_RANGE_MASK) << 16;
403 limit = (mem_limit_lo & PCI_PREF_RANGE_MASK) << 16;
405 if ((mem_base_lo & PCI_PREF_RANGE_TYPE_MASK) == PCI_PREF_RANGE_TYPE_64) {
406 u32 mem_base_hi, mem_limit_hi;
407 pci_read_config_dword(dev, PCI_PREF_BASE_UPPER32, &mem_base_hi);
408 pci_read_config_dword(dev, PCI_PREF_LIMIT_UPPER32, &mem_limit_hi);
411 * Some bridges set the base > limit by default, and some
412 * (broken) BIOSes do not initialize them. If we find
413 * this, just assume they are not being used.
415 if (mem_base_hi <= mem_limit_hi) {
416 #if BITS_PER_LONG == 64
417 base |= ((long) mem_base_hi) << 32;
418 limit |= ((long) mem_limit_hi) << 32;
420 if (mem_base_hi || mem_limit_hi) {
421 dev_err(&dev->dev, "can't handle 64-bit "
422 "address space for bridge\n");
429 res->flags = (mem_base_lo & PCI_MEMORY_RANGE_TYPE_MASK) | IORESOURCE_MEM | IORESOURCE_PREFETCH;
431 res->end = limit + 0xfffff;
435 static struct pci_bus * pci_alloc_bus(void)
439 b = kzalloc(sizeof(*b), GFP_KERNEL);
441 INIT_LIST_HEAD(&b->node);
442 INIT_LIST_HEAD(&b->children);
443 INIT_LIST_HEAD(&b->devices);
444 INIT_LIST_HEAD(&b->slots);
449 static struct pci_bus *pci_alloc_child_bus(struct pci_bus *parent,
450 struct pci_dev *bridge, int busnr)
452 struct pci_bus *child;
456 * Allocate a new bus, and inherit stuff from the parent..
458 child = pci_alloc_bus();
462 child->self = bridge;
463 child->parent = parent;
464 child->ops = parent->ops;
465 child->sysdata = parent->sysdata;
466 child->bus_flags = parent->bus_flags;
467 child->bridge = get_device(&bridge->dev);
469 /* initialize some portions of the bus device, but don't register it
470 * now as the parent is not properly set up yet. This device will get
471 * registered later in pci_bus_add_devices()
473 child->dev.class = &pcibus_class;
474 sprintf(child->dev.bus_id, "%04x:%02x", pci_domain_nr(child), busnr);
477 * Set up the primary, secondary and subordinate
480 child->number = child->secondary = busnr;
481 child->primary = parent->secondary;
482 child->subordinate = 0xff;
484 /* Set up default resource pointers and names.. */
485 for (i = 0; i < 4; i++) {
486 child->resource[i] = &bridge->resource[PCI_BRIDGE_RESOURCES+i];
487 child->resource[i]->name = child->name;
489 bridge->subordinate = child;
494 struct pci_bus *__ref pci_add_new_bus(struct pci_bus *parent, struct pci_dev *dev, int busnr)
496 struct pci_bus *child;
498 child = pci_alloc_child_bus(parent, dev, busnr);
500 down_write(&pci_bus_sem);
501 list_add_tail(&child->node, &parent->children);
502 up_write(&pci_bus_sem);
507 static void pci_fixup_parent_subordinate_busnr(struct pci_bus *child, int max)
509 struct pci_bus *parent = child->parent;
511 /* Attempts to fix that up are really dangerous unless
512 we're going to re-assign all bus numbers. */
513 if (!pcibios_assign_all_busses())
516 while (parent->parent && parent->subordinate < max) {
517 parent->subordinate = max;
518 pci_write_config_byte(parent->self, PCI_SUBORDINATE_BUS, max);
519 parent = parent->parent;
524 * If it's a bridge, configure it and scan the bus behind it.
525 * For CardBus bridges, we don't scan behind as the devices will
526 * be handled by the bridge driver itself.
528 * We need to process bridges in two passes -- first we scan those
529 * already configured by the BIOS and after we are done with all of
530 * them, we proceed to assigning numbers to the remaining buses in
531 * order to avoid overlaps between old and new bus numbers.
533 int __devinit pci_scan_bridge(struct pci_bus *bus, struct pci_dev *dev, int max, int pass)
535 struct pci_bus *child;
536 int is_cardbus = (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS);
540 pci_read_config_dword(dev, PCI_PRIMARY_BUS, &buses);
542 dev_dbg(&dev->dev, "scanning behind bridge, config %06x, pass %d\n",
543 buses & 0xffffff, pass);
545 /* Disable MasterAbortMode during probing to avoid reporting
546 of bus errors (in some architectures) */
547 pci_read_config_word(dev, PCI_BRIDGE_CONTROL, &bctl);
548 pci_write_config_word(dev, PCI_BRIDGE_CONTROL,
549 bctl & ~PCI_BRIDGE_CTL_MASTER_ABORT);
551 if ((buses & 0xffff00) && !pcibios_assign_all_busses() && !is_cardbus) {
552 unsigned int cmax, busnr;
554 * Bus already configured by firmware, process it in the first
555 * pass and just note the configuration.
559 busnr = (buses >> 8) & 0xFF;
562 * If we already got to this bus through a different bridge,
563 * ignore it. This can happen with the i450NX chipset.
565 if (pci_find_bus(pci_domain_nr(bus), busnr)) {
566 dev_info(&dev->dev, "bus %04x:%02x already known\n",
567 pci_domain_nr(bus), busnr);
571 child = pci_add_new_bus(bus, dev, busnr);
574 child->primary = buses & 0xFF;
575 child->subordinate = (buses >> 16) & 0xFF;
576 child->bridge_ctl = bctl;
578 cmax = pci_scan_child_bus(child);
581 if (child->subordinate > max)
582 max = child->subordinate;
585 * We need to assign a number to this bus which we always
586 * do in the second pass.
589 if (pcibios_assign_all_busses())
590 /* Temporarily disable forwarding of the
591 configuration cycles on all bridges in
592 this bus segment to avoid possible
593 conflicts in the second pass between two
594 bridges programmed with overlapping
596 pci_write_config_dword(dev, PCI_PRIMARY_BUS,
602 pci_write_config_word(dev, PCI_STATUS, 0xffff);
604 /* Prevent assigning a bus number that already exists.
605 * This can happen when a bridge is hot-plugged */
606 if (pci_find_bus(pci_domain_nr(bus), max+1))
608 child = pci_add_new_bus(bus, dev, ++max);
609 buses = (buses & 0xff000000)
610 | ((unsigned int)(child->primary) << 0)
611 | ((unsigned int)(child->secondary) << 8)
612 | ((unsigned int)(child->subordinate) << 16);
615 * yenta.c forces a secondary latency timer of 176.
616 * Copy that behaviour here.
619 buses &= ~0xff000000;
620 buses |= CARDBUS_LATENCY_TIMER << 24;
624 * We need to blast all three values with a single write.
626 pci_write_config_dword(dev, PCI_PRIMARY_BUS, buses);
629 child->bridge_ctl = bctl;
631 * Adjust subordinate busnr in parent buses.
632 * We do this before scanning for children because
633 * some devices may not be detected if the bios
636 pci_fixup_parent_subordinate_busnr(child, max);
637 /* Now we can scan all subordinate buses... */
638 max = pci_scan_child_bus(child);
640 * now fix it up again since we have found
641 * the real value of max.
643 pci_fixup_parent_subordinate_busnr(child, max);
646 * For CardBus bridges, we leave 4 bus numbers
647 * as cards with a PCI-to-PCI bridge can be
650 for (i=0; i<CARDBUS_RESERVE_BUSNR; i++) {
651 struct pci_bus *parent = bus;
652 if (pci_find_bus(pci_domain_nr(bus),
655 while (parent->parent) {
656 if ((!pcibios_assign_all_busses()) &&
657 (parent->subordinate > max) &&
658 (parent->subordinate <= max+i)) {
661 parent = parent->parent;
665 * Often, there are two cardbus bridges
666 * -- try to leave one valid bus number
674 pci_fixup_parent_subordinate_busnr(child, max);
677 * Set the subordinate bus number to its real value.
679 child->subordinate = max;
680 pci_write_config_byte(dev, PCI_SUBORDINATE_BUS, max);
684 (is_cardbus ? "PCI CardBus %04x:%02x" : "PCI Bus %04x:%02x"),
685 pci_domain_nr(bus), child->number);
687 /* Has only triggered on CardBus, fixup is in yenta_socket */
688 while (bus->parent) {
689 if ((child->subordinate > bus->subordinate) ||
690 (child->number > bus->subordinate) ||
691 (child->number < bus->number) ||
692 (child->subordinate < bus->number)) {
693 pr_debug("PCI: Bus #%02x (-#%02x) is %s "
694 "hidden behind%s bridge #%02x (-#%02x)\n",
695 child->number, child->subordinate,
696 (bus->number > child->subordinate &&
697 bus->subordinate < child->number) ?
698 "wholly" : "partially",
699 bus->self->transparent ? " transparent" : "",
700 bus->number, bus->subordinate);
706 pci_write_config_word(dev, PCI_BRIDGE_CONTROL, bctl);
712 * Read interrupt line and base address registers.
713 * The architecture-dependent code can tweak these, of course.
715 static void pci_read_irq(struct pci_dev *dev)
719 pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &irq);
722 pci_read_config_byte(dev, PCI_INTERRUPT_LINE, &irq);
726 #define LEGACY_IO_RESOURCE (IORESOURCE_IO | IORESOURCE_PCI_FIXED)
729 * pci_setup_device - fill in class and map information of a device
730 * @dev: the device structure to fill
732 * Initialize the device structure with information about the device's
733 * vendor,class,memory and IO-space addresses,IRQ lines etc.
734 * Called at initialisation of the PCI subsystem and by CardBus services.
735 * Returns 0 on success and -1 if unknown type of device (not normal, bridge
738 static int pci_setup_device(struct pci_dev * dev)
742 dev_set_name(&dev->dev, "%04x:%02x:%02x.%d", pci_domain_nr(dev->bus),
743 dev->bus->number, PCI_SLOT(dev->devfn),
744 PCI_FUNC(dev->devfn));
746 pci_read_config_dword(dev, PCI_CLASS_REVISION, &class);
747 dev->revision = class & 0xff;
748 class >>= 8; /* upper 3 bytes */
752 dev_dbg(&dev->dev, "found [%04x/%04x] class %06x header type %02x\n",
753 dev->vendor, dev->device, class, dev->hdr_type);
755 /* "Unknown power state" */
756 dev->current_state = PCI_UNKNOWN;
758 /* Early fixups, before probing the BARs */
759 pci_fixup_device(pci_fixup_early, dev);
760 class = dev->class >> 8;
762 switch (dev->hdr_type) { /* header type */
763 case PCI_HEADER_TYPE_NORMAL: /* standard header */
764 if (class == PCI_CLASS_BRIDGE_PCI)
767 pci_read_bases(dev, 6, PCI_ROM_ADDRESS);
768 pci_read_config_word(dev, PCI_SUBSYSTEM_VENDOR_ID, &dev->subsystem_vendor);
769 pci_read_config_word(dev, PCI_SUBSYSTEM_ID, &dev->subsystem_device);
772 * Do the ugly legacy mode stuff here rather than broken chip
773 * quirk code. Legacy mode ATA controllers have fixed
774 * addresses. These are not always echoed in BAR0-3, and
775 * BAR0-3 in a few cases contain junk!
777 if (class == PCI_CLASS_STORAGE_IDE) {
779 pci_read_config_byte(dev, PCI_CLASS_PROG, &progif);
780 if ((progif & 1) == 0) {
781 dev->resource[0].start = 0x1F0;
782 dev->resource[0].end = 0x1F7;
783 dev->resource[0].flags = LEGACY_IO_RESOURCE;
784 dev->resource[1].start = 0x3F6;
785 dev->resource[1].end = 0x3F6;
786 dev->resource[1].flags = LEGACY_IO_RESOURCE;
788 if ((progif & 4) == 0) {
789 dev->resource[2].start = 0x170;
790 dev->resource[2].end = 0x177;
791 dev->resource[2].flags = LEGACY_IO_RESOURCE;
792 dev->resource[3].start = 0x376;
793 dev->resource[3].end = 0x376;
794 dev->resource[3].flags = LEGACY_IO_RESOURCE;
799 case PCI_HEADER_TYPE_BRIDGE: /* bridge header */
800 if (class != PCI_CLASS_BRIDGE_PCI)
802 /* The PCI-to-PCI bridge spec requires that subtractive
803 decoding (i.e. transparent) bridge must have programming
804 interface code of 0x01. */
806 dev->transparent = ((dev->class & 0xff) == 1);
807 pci_read_bases(dev, 2, PCI_ROM_ADDRESS1);
810 case PCI_HEADER_TYPE_CARDBUS: /* CardBus bridge header */
811 if (class != PCI_CLASS_BRIDGE_CARDBUS)
814 pci_read_bases(dev, 1, 0);
815 pci_read_config_word(dev, PCI_CB_SUBSYSTEM_VENDOR_ID, &dev->subsystem_vendor);
816 pci_read_config_word(dev, PCI_CB_SUBSYSTEM_ID, &dev->subsystem_device);
819 default: /* unknown header */
820 dev_err(&dev->dev, "unknown header type %02x, "
821 "ignoring device\n", dev->hdr_type);
825 dev_err(&dev->dev, "ignoring class %02x (doesn't match header "
826 "type %02x)\n", class, dev->hdr_type);
827 dev->class = PCI_CLASS_NOT_DEFINED;
830 /* We found a fine healthy device, go go go... */
835 * pci_release_dev - free a pci device structure when all users of it are finished.
836 * @dev: device that's been disconnected
838 * Will be called only by the device core when all users of this pci device are
841 static void pci_release_dev(struct device *dev)
843 struct pci_dev *pci_dev;
845 pci_dev = to_pci_dev(dev);
846 pci_vpd_release(pci_dev);
850 static void set_pcie_port_type(struct pci_dev *pdev)
855 pos = pci_find_capability(pdev, PCI_CAP_ID_EXP);
859 pci_read_config_word(pdev, pos + PCI_EXP_FLAGS, ®16);
860 pdev->pcie_type = (reg16 & PCI_EXP_FLAGS_TYPE) >> 4;
864 * pci_cfg_space_size - get the configuration space size of the PCI device.
867 * Regular PCI devices have 256 bytes, but PCI-X 2 and PCI Express devices
868 * have 4096 bytes. Even if the device is capable, that doesn't mean we can
869 * access it. Maybe we don't have a way to generate extended config space
870 * accesses, or the device is behind a reverse Express bridge. So we try
871 * reading the dword at 0x100 which must either be 0 or a valid extended
874 int pci_cfg_space_size_ext(struct pci_dev *dev)
878 if (pci_read_config_dword(dev, 256, &status) != PCIBIOS_SUCCESSFUL)
880 if (status == 0xffffffff)
883 return PCI_CFG_SPACE_EXP_SIZE;
886 return PCI_CFG_SPACE_SIZE;
889 int pci_cfg_space_size(struct pci_dev *dev)
894 pos = pci_find_capability(dev, PCI_CAP_ID_EXP);
896 pos = pci_find_capability(dev, PCI_CAP_ID_PCIX);
900 pci_read_config_dword(dev, pos + PCI_X_STATUS, &status);
901 if (!(status & (PCI_X_STATUS_266MHZ | PCI_X_STATUS_533MHZ)))
905 return pci_cfg_space_size_ext(dev);
908 return PCI_CFG_SPACE_SIZE;
911 static void pci_release_bus_bridge_dev(struct device *dev)
916 struct pci_dev *alloc_pci_dev(void)
920 dev = kzalloc(sizeof(struct pci_dev), GFP_KERNEL);
924 INIT_LIST_HEAD(&dev->bus_list);
926 pci_msi_init_pci_dev(dev);
930 EXPORT_SYMBOL(alloc_pci_dev);
933 * Read the config data for a PCI device, sanity-check it
934 * and fill in the dev structure...
936 static struct pci_dev *pci_scan_device(struct pci_bus *bus, int devfn)
943 if (pci_bus_read_config_dword(bus, devfn, PCI_VENDOR_ID, &l))
946 /* some broken boards return 0 or ~0 if a slot is empty: */
947 if (l == 0xffffffff || l == 0x00000000 ||
948 l == 0x0000ffff || l == 0xffff0000)
951 /* Configuration request Retry Status */
952 while (l == 0xffff0001) {
955 if (pci_bus_read_config_dword(bus, devfn, PCI_VENDOR_ID, &l))
957 /* Card hasn't responded in 60 seconds? Must be stuck. */
958 if (delay > 60 * 1000) {
959 printk(KERN_WARNING "pci %04x:%02x:%02x.%d: not "
960 "responding\n", pci_domain_nr(bus),
961 bus->number, PCI_SLOT(devfn),
967 if (pci_bus_read_config_byte(bus, devfn, PCI_HEADER_TYPE, &hdr_type))
970 dev = alloc_pci_dev();
975 dev->sysdata = bus->sysdata;
976 dev->dev.parent = bus->bridge;
977 dev->dev.bus = &pci_bus_type;
979 dev->hdr_type = hdr_type & 0x7f;
980 dev->multifunction = !!(hdr_type & 0x80);
981 dev->vendor = l & 0xffff;
982 dev->device = (l >> 16) & 0xffff;
983 dev->cfg_size = pci_cfg_space_size(dev);
984 dev->error_state = pci_channel_io_normal;
985 set_pcie_port_type(dev);
987 /* Assume 32-bit PCI; let 64-bit PCI cards (which are far rarer)
988 set this higher, assuming the system even supports it. */
989 dev->dma_mask = 0xffffffff;
990 if (pci_setup_device(dev) < 0) {
995 pci_vpd_pci22_init(dev);
1000 void pci_device_add(struct pci_dev *dev, struct pci_bus *bus)
1002 device_initialize(&dev->dev);
1003 dev->dev.release = pci_release_dev;
1006 dev->dev.dma_mask = &dev->dma_mask;
1007 dev->dev.dma_parms = &dev->dma_parms;
1008 dev->dev.coherent_dma_mask = 0xffffffffull;
1010 pci_set_dma_max_seg_size(dev, 65536);
1011 pci_set_dma_seg_boundary(dev, 0xffffffff);
1013 /* Fix up broken headers */
1014 pci_fixup_device(pci_fixup_header, dev);
1016 /* Initialize power management of the device */
1020 * Add the device to our list of discovered devices
1021 * and the bus list for fixup functions, etc.
1023 down_write(&pci_bus_sem);
1024 list_add_tail(&dev->bus_list, &bus->devices);
1025 up_write(&pci_bus_sem);
1028 struct pci_dev *__ref pci_scan_single_device(struct pci_bus *bus, int devfn)
1030 struct pci_dev *dev;
1032 dev = pci_scan_device(bus, devfn);
1036 pci_device_add(dev, bus);
1040 EXPORT_SYMBOL(pci_scan_single_device);
1043 * pci_scan_slot - scan a PCI slot on a bus for devices.
1044 * @bus: PCI bus to scan
1045 * @devfn: slot number to scan (must have zero function.)
1047 * Scan a PCI slot on the specified PCI bus for devices, adding
1048 * discovered devices to the @bus->devices list. New devices
1049 * will not have is_added set.
1051 int pci_scan_slot(struct pci_bus *bus, int devfn)
1056 scan_all_fns = pcibios_scan_all_fns(bus, devfn);
1058 for (func = 0; func < 8; func++, devfn++) {
1059 struct pci_dev *dev;
1061 dev = pci_scan_single_device(bus, devfn);
1066 * If this is a single function device,
1067 * don't scan past the first function.
1069 if (!dev->multifunction) {
1071 dev->multifunction = 1;
1077 if (func == 0 && !scan_all_fns)
1082 /* only one slot has pcie device */
1083 if (bus->self && nr)
1084 pcie_aspm_init_link_state(bus->self);
1089 unsigned int __devinit pci_scan_child_bus(struct pci_bus *bus)
1091 unsigned int devfn, pass, max = bus->secondary;
1092 struct pci_dev *dev;
1094 pr_debug("PCI: Scanning bus %04x:%02x\n", pci_domain_nr(bus), bus->number);
1096 /* Go find them, Rover! */
1097 for (devfn = 0; devfn < 0x100; devfn += 8)
1098 pci_scan_slot(bus, devfn);
1101 * After performing arch-dependent fixup of the bus, look behind
1102 * all PCI-to-PCI bridges on this bus.
1104 pr_debug("PCI: Fixups for bus %04x:%02x\n", pci_domain_nr(bus), bus->number);
1105 pcibios_fixup_bus(bus);
1106 for (pass=0; pass < 2; pass++)
1107 list_for_each_entry(dev, &bus->devices, bus_list) {
1108 if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE ||
1109 dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)
1110 max = pci_scan_bridge(bus, dev, max, pass);
1114 * We've scanned the bus and so we know all about what's on
1115 * the other side of any bridges that may be on this bus plus
1118 * Return how far we've got finding sub-buses.
1120 pr_debug("PCI: Bus scan for %04x:%02x returning with max=%02x\n",
1121 pci_domain_nr(bus), bus->number, max);
1125 void __attribute__((weak)) set_pci_bus_resources_arch_default(struct pci_bus *b)
1129 struct pci_bus * pci_create_bus(struct device *parent,
1130 int bus, struct pci_ops *ops, void *sysdata)
1136 b = pci_alloc_bus();
1140 dev = kmalloc(sizeof(*dev), GFP_KERNEL);
1146 b->sysdata = sysdata;
1149 if (pci_find_bus(pci_domain_nr(b), bus)) {
1150 /* If we already got to this bus through a different bridge, ignore it */
1151 pr_debug("PCI: Bus %04x:%02x already known\n", pci_domain_nr(b), bus);
1155 down_write(&pci_bus_sem);
1156 list_add_tail(&b->node, &pci_root_buses);
1157 up_write(&pci_bus_sem);
1159 memset(dev, 0, sizeof(*dev));
1160 dev->parent = parent;
1161 dev->release = pci_release_bus_bridge_dev;
1162 sprintf(dev->bus_id, "pci%04x:%02x", pci_domain_nr(b), bus);
1163 error = device_register(dev);
1166 b->bridge = get_device(dev);
1169 set_dev_node(b->bridge, pcibus_to_node(b));
1171 b->dev.class = &pcibus_class;
1172 b->dev.parent = b->bridge;
1173 sprintf(b->dev.bus_id, "%04x:%02x", pci_domain_nr(b), bus);
1174 error = device_register(&b->dev);
1176 goto class_dev_reg_err;
1177 error = device_create_file(&b->dev, &dev_attr_cpuaffinity);
1179 goto dev_create_file_err;
1181 /* Create legacy_io and legacy_mem files for this bus */
1182 pci_create_legacy_files(b);
1184 b->number = b->secondary = bus;
1185 b->resource[0] = &ioport_resource;
1186 b->resource[1] = &iomem_resource;
1188 set_pci_bus_resources_arch_default(b);
1192 dev_create_file_err:
1193 device_unregister(&b->dev);
1195 device_unregister(dev);
1197 down_write(&pci_bus_sem);
1199 up_write(&pci_bus_sem);
1206 struct pci_bus * __devinit pci_scan_bus_parented(struct device *parent,
1207 int bus, struct pci_ops *ops, void *sysdata)
1211 b = pci_create_bus(parent, bus, ops, sysdata);
1213 b->subordinate = pci_scan_child_bus(b);
1216 EXPORT_SYMBOL(pci_scan_bus_parented);
1218 #ifdef CONFIG_HOTPLUG
1219 EXPORT_SYMBOL(pci_add_new_bus);
1220 EXPORT_SYMBOL(pci_scan_slot);
1221 EXPORT_SYMBOL(pci_scan_bridge);
1222 EXPORT_SYMBOL_GPL(pci_scan_child_bus);
1225 static int __init pci_sort_bf_cmp(const struct pci_dev *a, const struct pci_dev *b)
1227 if (pci_domain_nr(a->bus) < pci_domain_nr(b->bus)) return -1;
1228 else if (pci_domain_nr(a->bus) > pci_domain_nr(b->bus)) return 1;
1230 if (a->bus->number < b->bus->number) return -1;
1231 else if (a->bus->number > b->bus->number) return 1;
1233 if (a->devfn < b->devfn) return -1;
1234 else if (a->devfn > b->devfn) return 1;
1240 * Yes, this forcably breaks the klist abstraction temporarily. It
1241 * just wants to sort the klist, not change reference counts and
1242 * take/drop locks rapidly in the process. It does all this while
1243 * holding the lock for the list, so objects can't otherwise be
1244 * added/removed while we're swizzling.
1246 static void __init pci_insertion_sort_klist(struct pci_dev *a, struct list_head *list)
1248 struct list_head *pos;
1249 struct klist_node *n;
1253 list_for_each(pos, list) {
1254 n = container_of(pos, struct klist_node, n_node);
1255 dev = container_of(n, struct device, knode_bus);
1256 b = to_pci_dev(dev);
1257 if (pci_sort_bf_cmp(a, b) <= 0) {
1258 list_move_tail(&a->dev.knode_bus.n_node, &b->dev.knode_bus.n_node);
1262 list_move_tail(&a->dev.knode_bus.n_node, list);
1265 void __init pci_sort_breadthfirst(void)
1267 LIST_HEAD(sorted_devices);
1268 struct list_head *pos, *tmp;
1269 struct klist_node *n;
1271 struct pci_dev *pdev;
1272 struct klist *device_klist;
1274 device_klist = bus_get_device_klist(&pci_bus_type);
1276 spin_lock(&device_klist->k_lock);
1277 list_for_each_safe(pos, tmp, &device_klist->k_list) {
1278 n = container_of(pos, struct klist_node, n_node);
1279 dev = container_of(n, struct device, knode_bus);
1280 pdev = to_pci_dev(dev);
1281 pci_insertion_sort_klist(pdev, &sorted_devices);
1283 list_splice(&sorted_devices, &device_klist->k_list);
1284 spin_unlock(&device_klist->k_lock);