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>
14 #define CARDBUS_LATENCY_TIMER 176 /* secondary latency timer */
15 #define CARDBUS_RESERVE_BUSNR 3
16 #define PCI_CFG_SPACE_SIZE 256
17 #define PCI_CFG_SPACE_EXP_SIZE 4096
19 /* Ugh. Need to stop exporting this to modules. */
20 LIST_HEAD(pci_root_buses);
21 EXPORT_SYMBOL(pci_root_buses);
23 LIST_HEAD(pci_devices);
26 * Some device drivers need know if pci is initiated.
27 * Basically, we think pci is not initiated when there
28 * is no device in list of pci_devices.
30 int no_pci_devices(void)
32 return list_empty(&pci_devices);
35 EXPORT_SYMBOL(no_pci_devices);
37 #ifdef HAVE_PCI_LEGACY
39 * pci_create_legacy_files - create legacy I/O port and memory files
40 * @b: bus to create files under
42 * Some platforms allow access to legacy I/O port and ISA memory space on
43 * a per-bus basis. This routine creates the files and ties them into
44 * their associated read, write and mmap files from pci-sysfs.c
46 static void pci_create_legacy_files(struct pci_bus *b)
48 b->legacy_io = kzalloc(sizeof(struct bin_attribute) * 2,
51 b->legacy_io->attr.name = "legacy_io";
52 b->legacy_io->size = 0xffff;
53 b->legacy_io->attr.mode = S_IRUSR | S_IWUSR;
54 b->legacy_io->read = pci_read_legacy_io;
55 b->legacy_io->write = pci_write_legacy_io;
56 device_create_bin_file(&b->dev, b->legacy_io);
58 /* Allocated above after the legacy_io struct */
59 b->legacy_mem = b->legacy_io + 1;
60 b->legacy_mem->attr.name = "legacy_mem";
61 b->legacy_mem->size = 1024*1024;
62 b->legacy_mem->attr.mode = S_IRUSR | S_IWUSR;
63 b->legacy_mem->mmap = pci_mmap_legacy_mem;
64 device_create_bin_file(&b->dev, b->legacy_mem);
68 void pci_remove_legacy_files(struct pci_bus *b)
71 device_remove_bin_file(&b->dev, b->legacy_io);
72 device_remove_bin_file(&b->dev, b->legacy_mem);
73 kfree(b->legacy_io); /* both are allocated here */
76 #else /* !HAVE_PCI_LEGACY */
77 static inline void pci_create_legacy_files(struct pci_bus *bus) { return; }
78 void pci_remove_legacy_files(struct pci_bus *bus) { return; }
79 #endif /* HAVE_PCI_LEGACY */
82 * PCI Bus Class Devices
84 static ssize_t pci_bus_show_cpuaffinity(struct device *dev,
86 struct device_attribute *attr,
92 cpumask = pcibus_to_cpumask(to_pci_bus(dev));
94 cpulist_scnprintf(buf, PAGE_SIZE-2, cpumask):
95 cpumask_scnprintf(buf, PAGE_SIZE-2, cpumask);
101 static ssize_t inline pci_bus_show_cpumaskaffinity(struct device *dev,
102 struct device_attribute *attr,
105 return pci_bus_show_cpuaffinity(dev, 0, attr, buf);
108 static ssize_t inline pci_bus_show_cpulistaffinity(struct device *dev,
109 struct device_attribute *attr,
112 return pci_bus_show_cpuaffinity(dev, 1, attr, buf);
115 DEVICE_ATTR(cpuaffinity, S_IRUGO, pci_bus_show_cpumaskaffinity, NULL);
116 DEVICE_ATTR(cpulistaffinity, S_IRUGO, pci_bus_show_cpulistaffinity, NULL);
121 static void release_pcibus_dev(struct device *dev)
123 struct pci_bus *pci_bus = to_pci_bus(dev);
126 put_device(pci_bus->bridge);
130 static struct class pcibus_class = {
132 .dev_release = &release_pcibus_dev,
135 static int __init pcibus_class_init(void)
137 return class_register(&pcibus_class);
139 postcore_initcall(pcibus_class_init);
142 * Translate the low bits of the PCI base
143 * to the resource type
145 static inline unsigned int pci_calc_resource_flags(unsigned int flags)
147 if (flags & PCI_BASE_ADDRESS_SPACE_IO)
148 return IORESOURCE_IO;
150 if (flags & PCI_BASE_ADDRESS_MEM_PREFETCH)
151 return IORESOURCE_MEM | IORESOURCE_PREFETCH;
153 return IORESOURCE_MEM;
157 * Find the extent of a PCI decode..
159 static u32 pci_size(u32 base, u32 maxbase, u32 mask)
161 u32 size = mask & maxbase; /* Find the significant bits */
165 /* Get the lowest of them to find the decode size, and
166 from that the extent. */
167 size = (size & ~(size-1)) - 1;
169 /* base == maxbase can be valid only if the BAR has
170 already been programmed with all 1s. */
171 if (base == maxbase && ((base | size) & mask) != mask)
177 static u64 pci_size64(u64 base, u64 maxbase, u64 mask)
179 u64 size = mask & maxbase; /* Find the significant bits */
183 /* Get the lowest of them to find the decode size, and
184 from that the extent. */
185 size = (size & ~(size-1)) - 1;
187 /* base == maxbase can be valid only if the BAR has
188 already been programmed with all 1s. */
189 if (base == maxbase && ((base | size) & mask) != mask)
195 static inline int is_64bit_memory(u32 mask)
197 if ((mask & (PCI_BASE_ADDRESS_SPACE|PCI_BASE_ADDRESS_MEM_TYPE_MASK)) ==
198 (PCI_BASE_ADDRESS_SPACE_MEMORY|PCI_BASE_ADDRESS_MEM_TYPE_64))
203 static void pci_read_bases(struct pci_dev *dev, unsigned int howmany, int rom)
205 unsigned int pos, reg, next;
207 struct resource *res;
209 for(pos=0; pos<howmany; pos = next) {
215 res = &dev->resource[pos];
216 res->name = pci_name(dev);
217 reg = PCI_BASE_ADDRESS_0 + (pos << 2);
218 pci_read_config_dword(dev, reg, &l);
219 pci_write_config_dword(dev, reg, ~0);
220 pci_read_config_dword(dev, reg, &sz);
221 pci_write_config_dword(dev, reg, l);
222 if (!sz || sz == 0xffffffff)
227 if ((l & PCI_BASE_ADDRESS_SPACE) ==
228 PCI_BASE_ADDRESS_SPACE_MEMORY) {
229 sz = pci_size(l, sz, (u32)PCI_BASE_ADDRESS_MEM_MASK);
231 * For 64bit prefetchable memory sz could be 0, if the
232 * real size is bigger than 4G, so we need to check
235 if (!is_64bit_memory(l) && !sz)
237 res->start = l & PCI_BASE_ADDRESS_MEM_MASK;
238 res->flags |= l & ~PCI_BASE_ADDRESS_MEM_MASK;
240 sz = pci_size(l, sz, PCI_BASE_ADDRESS_IO_MASK & 0xffff);
243 res->start = l & PCI_BASE_ADDRESS_IO_MASK;
244 res->flags |= l & ~PCI_BASE_ADDRESS_IO_MASK;
246 res->end = res->start + (unsigned long) sz;
247 res->flags |= pci_calc_resource_flags(l);
248 if (is_64bit_memory(l)) {
251 pci_read_config_dword(dev, reg+4, &lhi);
252 pci_write_config_dword(dev, reg+4, ~0);
253 pci_read_config_dword(dev, reg+4, &szhi);
254 pci_write_config_dword(dev, reg+4, lhi);
255 sz64 = ((u64)szhi << 32) | raw_sz;
256 l64 = ((u64)lhi << 32) | l;
257 sz64 = pci_size64(l64, sz64, PCI_BASE_ADDRESS_MEM_MASK);
259 #if BITS_PER_LONG == 64
266 res->start = l64 & PCI_BASE_ADDRESS_MEM_MASK;
267 res->end = res->start + sz64;
269 if (sz64 > 0x100000000ULL) {
270 printk(KERN_ERR "PCI: Unable to handle 64-bit "
271 "BAR for device %s\n", pci_name(dev));
275 /* 64-bit wide address, treat as disabled */
276 pci_write_config_dword(dev, reg,
277 l & ~(u32)PCI_BASE_ADDRESS_MEM_MASK);
278 pci_write_config_dword(dev, reg+4, 0);
286 dev->rom_base_reg = rom;
287 res = &dev->resource[PCI_ROM_RESOURCE];
288 res->name = pci_name(dev);
289 pci_read_config_dword(dev, rom, &l);
290 pci_write_config_dword(dev, rom, ~PCI_ROM_ADDRESS_ENABLE);
291 pci_read_config_dword(dev, rom, &sz);
292 pci_write_config_dword(dev, rom, l);
295 if (sz && sz != 0xffffffff) {
296 sz = pci_size(l, sz, (u32)PCI_ROM_ADDRESS_MASK);
298 res->flags = (l & IORESOURCE_ROM_ENABLE) |
299 IORESOURCE_MEM | IORESOURCE_PREFETCH |
300 IORESOURCE_READONLY | IORESOURCE_CACHEABLE;
301 res->start = l & PCI_ROM_ADDRESS_MASK;
302 res->end = res->start + (unsigned long) sz;
308 void __devinit pci_read_bridge_bases(struct pci_bus *child)
310 struct pci_dev *dev = child->self;
311 u8 io_base_lo, io_limit_lo;
312 u16 mem_base_lo, mem_limit_lo;
313 unsigned long base, limit;
314 struct resource *res;
317 if (!dev) /* It's a host bus, nothing to read */
320 if (dev->transparent) {
321 printk(KERN_INFO "PCI: Transparent bridge - %s\n", pci_name(dev));
322 for(i = 3; i < PCI_BUS_NUM_RESOURCES; i++)
323 child->resource[i] = child->parent->resource[i - 3];
327 child->resource[i] = &dev->resource[PCI_BRIDGE_RESOURCES+i];
329 res = child->resource[0];
330 pci_read_config_byte(dev, PCI_IO_BASE, &io_base_lo);
331 pci_read_config_byte(dev, PCI_IO_LIMIT, &io_limit_lo);
332 base = (io_base_lo & PCI_IO_RANGE_MASK) << 8;
333 limit = (io_limit_lo & PCI_IO_RANGE_MASK) << 8;
335 if ((io_base_lo & PCI_IO_RANGE_TYPE_MASK) == PCI_IO_RANGE_TYPE_32) {
336 u16 io_base_hi, io_limit_hi;
337 pci_read_config_word(dev, PCI_IO_BASE_UPPER16, &io_base_hi);
338 pci_read_config_word(dev, PCI_IO_LIMIT_UPPER16, &io_limit_hi);
339 base |= (io_base_hi << 16);
340 limit |= (io_limit_hi << 16);
344 res->flags = (io_base_lo & PCI_IO_RANGE_TYPE_MASK) | IORESOURCE_IO;
348 res->end = limit + 0xfff;
351 res = child->resource[1];
352 pci_read_config_word(dev, PCI_MEMORY_BASE, &mem_base_lo);
353 pci_read_config_word(dev, PCI_MEMORY_LIMIT, &mem_limit_lo);
354 base = (mem_base_lo & PCI_MEMORY_RANGE_MASK) << 16;
355 limit = (mem_limit_lo & PCI_MEMORY_RANGE_MASK) << 16;
357 res->flags = (mem_base_lo & PCI_MEMORY_RANGE_TYPE_MASK) | IORESOURCE_MEM;
359 res->end = limit + 0xfffff;
362 res = child->resource[2];
363 pci_read_config_word(dev, PCI_PREF_MEMORY_BASE, &mem_base_lo);
364 pci_read_config_word(dev, PCI_PREF_MEMORY_LIMIT, &mem_limit_lo);
365 base = (mem_base_lo & PCI_PREF_RANGE_MASK) << 16;
366 limit = (mem_limit_lo & PCI_PREF_RANGE_MASK) << 16;
368 if ((mem_base_lo & PCI_PREF_RANGE_TYPE_MASK) == PCI_PREF_RANGE_TYPE_64) {
369 u32 mem_base_hi, mem_limit_hi;
370 pci_read_config_dword(dev, PCI_PREF_BASE_UPPER32, &mem_base_hi);
371 pci_read_config_dword(dev, PCI_PREF_LIMIT_UPPER32, &mem_limit_hi);
374 * Some bridges set the base > limit by default, and some
375 * (broken) BIOSes do not initialize them. If we find
376 * this, just assume they are not being used.
378 if (mem_base_hi <= mem_limit_hi) {
379 #if BITS_PER_LONG == 64
380 base |= ((long) mem_base_hi) << 32;
381 limit |= ((long) mem_limit_hi) << 32;
383 if (mem_base_hi || mem_limit_hi) {
384 printk(KERN_ERR "PCI: Unable to handle 64-bit address space for bridge %s\n", pci_name(dev));
391 res->flags = (mem_base_lo & PCI_MEMORY_RANGE_TYPE_MASK) | IORESOURCE_MEM | IORESOURCE_PREFETCH;
393 res->end = limit + 0xfffff;
397 static struct pci_bus * pci_alloc_bus(void)
401 b = kzalloc(sizeof(*b), GFP_KERNEL);
403 INIT_LIST_HEAD(&b->node);
404 INIT_LIST_HEAD(&b->children);
405 INIT_LIST_HEAD(&b->devices);
410 static struct pci_bus * __devinit
411 pci_alloc_child_bus(struct pci_bus *parent, struct pci_dev *bridge, int busnr)
413 struct pci_bus *child;
417 * Allocate a new bus, and inherit stuff from the parent..
419 child = pci_alloc_bus();
423 child->self = bridge;
424 child->parent = parent;
425 child->ops = parent->ops;
426 child->sysdata = parent->sysdata;
427 child->bus_flags = parent->bus_flags;
428 child->bridge = get_device(&bridge->dev);
430 /* initialize some portions of the bus device, but don't register it
431 * now as the parent is not properly set up yet. This device will get
432 * registered later in pci_bus_add_devices()
434 child->dev.class = &pcibus_class;
435 sprintf(child->dev.bus_id, "%04x:%02x", pci_domain_nr(child), busnr);
438 * Set up the primary, secondary and subordinate
441 child->number = child->secondary = busnr;
442 child->primary = parent->secondary;
443 child->subordinate = 0xff;
445 /* Set up default resource pointers and names.. */
446 for (i = 0; i < 4; i++) {
447 child->resource[i] = &bridge->resource[PCI_BRIDGE_RESOURCES+i];
448 child->resource[i]->name = child->name;
450 bridge->subordinate = child;
455 struct pci_bus *__ref pci_add_new_bus(struct pci_bus *parent, struct pci_dev *dev, int busnr)
457 struct pci_bus *child;
459 child = pci_alloc_child_bus(parent, dev, busnr);
461 down_write(&pci_bus_sem);
462 list_add_tail(&child->node, &parent->children);
463 up_write(&pci_bus_sem);
468 static void pci_fixup_parent_subordinate_busnr(struct pci_bus *child, int max)
470 struct pci_bus *parent = child->parent;
472 /* Attempts to fix that up are really dangerous unless
473 we're going to re-assign all bus numbers. */
474 if (!pcibios_assign_all_busses())
477 while (parent->parent && parent->subordinate < max) {
478 parent->subordinate = max;
479 pci_write_config_byte(parent->self, PCI_SUBORDINATE_BUS, max);
480 parent = parent->parent;
485 * If it's a bridge, configure it and scan the bus behind it.
486 * For CardBus bridges, we don't scan behind as the devices will
487 * be handled by the bridge driver itself.
489 * We need to process bridges in two passes -- first we scan those
490 * already configured by the BIOS and after we are done with all of
491 * them, we proceed to assigning numbers to the remaining buses in
492 * order to avoid overlaps between old and new bus numbers.
494 int __devinit pci_scan_bridge(struct pci_bus *bus, struct pci_dev *dev, int max, int pass)
496 struct pci_bus *child;
497 int is_cardbus = (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS);
501 pci_read_config_dword(dev, PCI_PRIMARY_BUS, &buses);
503 pr_debug("PCI: Scanning behind PCI bridge %s, config %06x, pass %d\n",
504 pci_name(dev), buses & 0xffffff, pass);
506 /* Disable MasterAbortMode during probing to avoid reporting
507 of bus errors (in some architectures) */
508 pci_read_config_word(dev, PCI_BRIDGE_CONTROL, &bctl);
509 pci_write_config_word(dev, PCI_BRIDGE_CONTROL,
510 bctl & ~PCI_BRIDGE_CTL_MASTER_ABORT);
512 if ((buses & 0xffff00) && !pcibios_assign_all_busses() && !is_cardbus) {
513 unsigned int cmax, busnr;
515 * Bus already configured by firmware, process it in the first
516 * pass and just note the configuration.
520 busnr = (buses >> 8) & 0xFF;
523 * If we already got to this bus through a different bridge,
524 * ignore it. This can happen with the i450NX chipset.
526 if (pci_find_bus(pci_domain_nr(bus), busnr)) {
527 printk(KERN_INFO "PCI: Bus %04x:%02x already known\n",
528 pci_domain_nr(bus), busnr);
532 child = pci_add_new_bus(bus, dev, busnr);
535 child->primary = buses & 0xFF;
536 child->subordinate = (buses >> 16) & 0xFF;
537 child->bridge_ctl = bctl;
539 cmax = pci_scan_child_bus(child);
542 if (child->subordinate > max)
543 max = child->subordinate;
546 * We need to assign a number to this bus which we always
547 * do in the second pass.
550 if (pcibios_assign_all_busses())
551 /* Temporarily disable forwarding of the
552 configuration cycles on all bridges in
553 this bus segment to avoid possible
554 conflicts in the second pass between two
555 bridges programmed with overlapping
557 pci_write_config_dword(dev, PCI_PRIMARY_BUS,
563 pci_write_config_word(dev, PCI_STATUS, 0xffff);
565 /* Prevent assigning a bus number that already exists.
566 * This can happen when a bridge is hot-plugged */
567 if (pci_find_bus(pci_domain_nr(bus), max+1))
569 child = pci_add_new_bus(bus, dev, ++max);
570 buses = (buses & 0xff000000)
571 | ((unsigned int)(child->primary) << 0)
572 | ((unsigned int)(child->secondary) << 8)
573 | ((unsigned int)(child->subordinate) << 16);
576 * yenta.c forces a secondary latency timer of 176.
577 * Copy that behaviour here.
580 buses &= ~0xff000000;
581 buses |= CARDBUS_LATENCY_TIMER << 24;
585 * We need to blast all three values with a single write.
587 pci_write_config_dword(dev, PCI_PRIMARY_BUS, buses);
590 child->bridge_ctl = bctl;
592 * Adjust subordinate busnr in parent buses.
593 * We do this before scanning for children because
594 * some devices may not be detected if the bios
597 pci_fixup_parent_subordinate_busnr(child, max);
598 /* Now we can scan all subordinate buses... */
599 max = pci_scan_child_bus(child);
601 * now fix it up again since we have found
602 * the real value of max.
604 pci_fixup_parent_subordinate_busnr(child, max);
607 * For CardBus bridges, we leave 4 bus numbers
608 * as cards with a PCI-to-PCI bridge can be
611 for (i=0; i<CARDBUS_RESERVE_BUSNR; i++) {
612 struct pci_bus *parent = bus;
613 if (pci_find_bus(pci_domain_nr(bus),
616 while (parent->parent) {
617 if ((!pcibios_assign_all_busses()) &&
618 (parent->subordinate > max) &&
619 (parent->subordinate <= max+i)) {
622 parent = parent->parent;
626 * Often, there are two cardbus bridges
627 * -- try to leave one valid bus number
635 pci_fixup_parent_subordinate_busnr(child, max);
638 * Set the subordinate bus number to its real value.
640 child->subordinate = max;
641 pci_write_config_byte(dev, PCI_SUBORDINATE_BUS, max);
644 sprintf(child->name, (is_cardbus ? "PCI CardBus #%02x" : "PCI Bus #%02x"), child->number);
646 /* Has only triggered on CardBus, fixup is in yenta_socket */
647 while (bus->parent) {
648 if ((child->subordinate > bus->subordinate) ||
649 (child->number > bus->subordinate) ||
650 (child->number < bus->number) ||
651 (child->subordinate < bus->number)) {
652 pr_debug("PCI: Bus #%02x (-#%02x) is %s "
653 "hidden behind%s bridge #%02x (-#%02x)\n",
654 child->number, child->subordinate,
655 (bus->number > child->subordinate &&
656 bus->subordinate < child->number) ?
657 "wholly" : "partially",
658 bus->self->transparent ? " transparent" : "",
659 bus->number, bus->subordinate);
665 pci_write_config_word(dev, PCI_BRIDGE_CONTROL, bctl);
671 * Read interrupt line and base address registers.
672 * The architecture-dependent code can tweak these, of course.
674 static void pci_read_irq(struct pci_dev *dev)
678 pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &irq);
681 pci_read_config_byte(dev, PCI_INTERRUPT_LINE, &irq);
685 #define LEGACY_IO_RESOURCE (IORESOURCE_IO | IORESOURCE_PCI_FIXED)
688 * pci_setup_device - fill in class and map information of a device
689 * @dev: the device structure to fill
691 * Initialize the device structure with information about the device's
692 * vendor,class,memory and IO-space addresses,IRQ lines etc.
693 * Called at initialisation of the PCI subsystem and by CardBus services.
694 * Returns 0 on success and -1 if unknown type of device (not normal, bridge
697 static int pci_setup_device(struct pci_dev * dev)
701 sprintf(pci_name(dev), "%04x:%02x:%02x.%d", pci_domain_nr(dev->bus),
702 dev->bus->number, PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn));
704 pci_read_config_dword(dev, PCI_CLASS_REVISION, &class);
705 dev->revision = class & 0xff;
706 class >>= 8; /* upper 3 bytes */
710 pr_debug("PCI: Found %s [%04x/%04x] %06x %02x\n", pci_name(dev),
711 dev->vendor, dev->device, class, dev->hdr_type);
713 /* "Unknown power state" */
714 dev->current_state = PCI_UNKNOWN;
716 /* Early fixups, before probing the BARs */
717 pci_fixup_device(pci_fixup_early, dev);
718 class = dev->class >> 8;
720 switch (dev->hdr_type) { /* header type */
721 case PCI_HEADER_TYPE_NORMAL: /* standard header */
722 if (class == PCI_CLASS_BRIDGE_PCI)
725 pci_read_bases(dev, 6, PCI_ROM_ADDRESS);
726 pci_read_config_word(dev, PCI_SUBSYSTEM_VENDOR_ID, &dev->subsystem_vendor);
727 pci_read_config_word(dev, PCI_SUBSYSTEM_ID, &dev->subsystem_device);
730 * Do the ugly legacy mode stuff here rather than broken chip
731 * quirk code. Legacy mode ATA controllers have fixed
732 * addresses. These are not always echoed in BAR0-3, and
733 * BAR0-3 in a few cases contain junk!
735 if (class == PCI_CLASS_STORAGE_IDE) {
737 pci_read_config_byte(dev, PCI_CLASS_PROG, &progif);
738 if ((progif & 1) == 0) {
739 dev->resource[0].start = 0x1F0;
740 dev->resource[0].end = 0x1F7;
741 dev->resource[0].flags = LEGACY_IO_RESOURCE;
742 dev->resource[1].start = 0x3F6;
743 dev->resource[1].end = 0x3F6;
744 dev->resource[1].flags = LEGACY_IO_RESOURCE;
746 if ((progif & 4) == 0) {
747 dev->resource[2].start = 0x170;
748 dev->resource[2].end = 0x177;
749 dev->resource[2].flags = LEGACY_IO_RESOURCE;
750 dev->resource[3].start = 0x376;
751 dev->resource[3].end = 0x376;
752 dev->resource[3].flags = LEGACY_IO_RESOURCE;
757 case PCI_HEADER_TYPE_BRIDGE: /* bridge header */
758 if (class != PCI_CLASS_BRIDGE_PCI)
760 /* The PCI-to-PCI bridge spec requires that subtractive
761 decoding (i.e. transparent) bridge must have programming
762 interface code of 0x01. */
764 dev->transparent = ((dev->class & 0xff) == 1);
765 pci_read_bases(dev, 2, PCI_ROM_ADDRESS1);
768 case PCI_HEADER_TYPE_CARDBUS: /* CardBus bridge header */
769 if (class != PCI_CLASS_BRIDGE_CARDBUS)
772 pci_read_bases(dev, 1, 0);
773 pci_read_config_word(dev, PCI_CB_SUBSYSTEM_VENDOR_ID, &dev->subsystem_vendor);
774 pci_read_config_word(dev, PCI_CB_SUBSYSTEM_ID, &dev->subsystem_device);
777 default: /* unknown header */
778 printk(KERN_ERR "PCI: device %s has unknown header type %02x, ignoring.\n",
779 pci_name(dev), dev->hdr_type);
783 printk(KERN_ERR "PCI: %s: class %x doesn't match header type %02x. Ignoring class.\n",
784 pci_name(dev), class, dev->hdr_type);
785 dev->class = PCI_CLASS_NOT_DEFINED;
788 /* We found a fine healthy device, go go go... */
793 * pci_release_dev - free a pci device structure when all users of it are finished.
794 * @dev: device that's been disconnected
796 * Will be called only by the device core when all users of this pci device are
799 static void pci_release_dev(struct device *dev)
801 struct pci_dev *pci_dev;
803 pci_dev = to_pci_dev(dev);
807 static void set_pcie_port_type(struct pci_dev *pdev)
812 pos = pci_find_capability(pdev, PCI_CAP_ID_EXP);
816 pci_read_config_word(pdev, pos + PCI_EXP_FLAGS, ®16);
817 pdev->pcie_type = (reg16 & PCI_EXP_FLAGS_TYPE) >> 4;
821 * pci_cfg_space_size - get the configuration space size of the PCI device.
824 * Regular PCI devices have 256 bytes, but PCI-X 2 and PCI Express devices
825 * have 4096 bytes. Even if the device is capable, that doesn't mean we can
826 * access it. Maybe we don't have a way to generate extended config space
827 * accesses, or the device is behind a reverse Express bridge. So we try
828 * reading the dword at 0x100 which must either be 0 or a valid extended
831 int pci_cfg_space_size(struct pci_dev *dev)
836 pos = pci_find_capability(dev, PCI_CAP_ID_EXP);
838 pos = pci_find_capability(dev, PCI_CAP_ID_PCIX);
842 pci_read_config_dword(dev, pos + PCI_X_STATUS, &status);
843 if (!(status & (PCI_X_STATUS_266MHZ | PCI_X_STATUS_533MHZ)))
847 if (pci_read_config_dword(dev, 256, &status) != PCIBIOS_SUCCESSFUL)
849 if (status == 0xffffffff)
852 return PCI_CFG_SPACE_EXP_SIZE;
855 return PCI_CFG_SPACE_SIZE;
858 static void pci_release_bus_bridge_dev(struct device *dev)
863 struct pci_dev *alloc_pci_dev(void)
867 dev = kzalloc(sizeof(struct pci_dev), GFP_KERNEL);
871 INIT_LIST_HEAD(&dev->global_list);
872 INIT_LIST_HEAD(&dev->bus_list);
874 pci_msi_init_pci_dev(dev);
878 EXPORT_SYMBOL(alloc_pci_dev);
881 * Read the config data for a PCI device, sanity-check it
882 * and fill in the dev structure...
884 static struct pci_dev * __devinit
885 pci_scan_device(struct pci_bus *bus, int devfn)
892 if (pci_bus_read_config_dword(bus, devfn, PCI_VENDOR_ID, &l))
895 /* some broken boards return 0 or ~0 if a slot is empty: */
896 if (l == 0xffffffff || l == 0x00000000 ||
897 l == 0x0000ffff || l == 0xffff0000)
900 /* Configuration request Retry Status */
901 while (l == 0xffff0001) {
904 if (pci_bus_read_config_dword(bus, devfn, PCI_VENDOR_ID, &l))
906 /* Card hasn't responded in 60 seconds? Must be stuck. */
907 if (delay > 60 * 1000) {
908 printk(KERN_WARNING "Device %04x:%02x:%02x.%d not "
909 "responding\n", pci_domain_nr(bus),
910 bus->number, PCI_SLOT(devfn),
916 if (pci_bus_read_config_byte(bus, devfn, PCI_HEADER_TYPE, &hdr_type))
919 dev = alloc_pci_dev();
924 dev->sysdata = bus->sysdata;
925 dev->dev.parent = bus->bridge;
926 dev->dev.bus = &pci_bus_type;
928 dev->hdr_type = hdr_type & 0x7f;
929 dev->multifunction = !!(hdr_type & 0x80);
930 dev->vendor = l & 0xffff;
931 dev->device = (l >> 16) & 0xffff;
932 dev->cfg_size = pci_cfg_space_size(dev);
933 dev->error_state = pci_channel_io_normal;
934 set_pcie_port_type(dev);
936 /* Assume 32-bit PCI; let 64-bit PCI cards (which are far rarer)
937 set this higher, assuming the system even supports it. */
938 dev->dma_mask = 0xffffffff;
939 if (pci_setup_device(dev) < 0) {
947 void pci_device_add(struct pci_dev *dev, struct pci_bus *bus)
949 device_initialize(&dev->dev);
950 dev->dev.release = pci_release_dev;
953 set_dev_node(&dev->dev, pcibus_to_node(bus));
954 dev->dev.dma_mask = &dev->dma_mask;
955 dev->dev.dma_parms = &dev->dma_parms;
956 dev->dev.coherent_dma_mask = 0xffffffffull;
958 pci_set_dma_max_seg_size(dev, 65536);
959 pci_set_dma_seg_boundary(dev, 0xffffffff);
961 /* Fix up broken headers */
962 pci_fixup_device(pci_fixup_header, dev);
965 * Add the device to our list of discovered devices
966 * and the bus list for fixup functions, etc.
968 INIT_LIST_HEAD(&dev->global_list);
969 down_write(&pci_bus_sem);
970 list_add_tail(&dev->bus_list, &bus->devices);
971 up_write(&pci_bus_sem);
974 struct pci_dev *__ref pci_scan_single_device(struct pci_bus *bus, int devfn)
978 dev = pci_scan_device(bus, devfn);
982 pci_device_add(dev, bus);
986 EXPORT_SYMBOL(pci_scan_single_device);
989 * pci_scan_slot - scan a PCI slot on a bus for devices.
990 * @bus: PCI bus to scan
991 * @devfn: slot number to scan (must have zero function.)
993 * Scan a PCI slot on the specified PCI bus for devices, adding
994 * discovered devices to the @bus->devices list. New devices
995 * will have an empty dev->global_list head.
997 int pci_scan_slot(struct pci_bus *bus, int devfn)
1002 scan_all_fns = pcibios_scan_all_fns(bus, devfn);
1004 for (func = 0; func < 8; func++, devfn++) {
1005 struct pci_dev *dev;
1007 dev = pci_scan_single_device(bus, devfn);
1012 * If this is a single function device,
1013 * don't scan past the first function.
1015 if (!dev->multifunction) {
1017 dev->multifunction = 1;
1023 if (func == 0 && !scan_all_fns)
1030 unsigned int __devinit pci_scan_child_bus(struct pci_bus *bus)
1032 unsigned int devfn, pass, max = bus->secondary;
1033 struct pci_dev *dev;
1035 pr_debug("PCI: Scanning bus %04x:%02x\n", pci_domain_nr(bus), bus->number);
1037 /* Go find them, Rover! */
1038 for (devfn = 0; devfn < 0x100; devfn += 8)
1039 pci_scan_slot(bus, devfn);
1042 * After performing arch-dependent fixup of the bus, look behind
1043 * all PCI-to-PCI bridges on this bus.
1045 pr_debug("PCI: Fixups for bus %04x:%02x\n", pci_domain_nr(bus), bus->number);
1046 pcibios_fixup_bus(bus);
1047 for (pass=0; pass < 2; pass++)
1048 list_for_each_entry(dev, &bus->devices, bus_list) {
1049 if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE ||
1050 dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)
1051 max = pci_scan_bridge(bus, dev, max, pass);
1055 * We've scanned the bus and so we know all about what's on
1056 * the other side of any bridges that may be on this bus plus
1059 * Return how far we've got finding sub-buses.
1061 pr_debug("PCI: Bus scan for %04x:%02x returning with max=%02x\n",
1062 pci_domain_nr(bus), bus->number, max);
1066 struct pci_bus * pci_create_bus(struct device *parent,
1067 int bus, struct pci_ops *ops, void *sysdata)
1073 b = pci_alloc_bus();
1077 dev = kmalloc(sizeof(*dev), GFP_KERNEL);
1083 b->sysdata = sysdata;
1086 if (pci_find_bus(pci_domain_nr(b), bus)) {
1087 /* If we already got to this bus through a different bridge, ignore it */
1088 pr_debug("PCI: Bus %04x:%02x already known\n", pci_domain_nr(b), bus);
1092 down_write(&pci_bus_sem);
1093 list_add_tail(&b->node, &pci_root_buses);
1094 up_write(&pci_bus_sem);
1096 memset(dev, 0, sizeof(*dev));
1097 dev->parent = parent;
1098 dev->release = pci_release_bus_bridge_dev;
1099 sprintf(dev->bus_id, "pci%04x:%02x", pci_domain_nr(b), bus);
1100 error = device_register(dev);
1103 b->bridge = get_device(dev);
1105 b->dev.class = &pcibus_class;
1106 b->dev.parent = b->bridge;
1107 sprintf(b->dev.bus_id, "%04x:%02x", pci_domain_nr(b), bus);
1108 error = device_register(&b->dev);
1110 goto class_dev_reg_err;
1111 error = device_create_file(&b->dev, &dev_attr_cpuaffinity);
1113 goto dev_create_file_err;
1115 /* Create legacy_io and legacy_mem files for this bus */
1116 pci_create_legacy_files(b);
1118 b->number = b->secondary = bus;
1119 b->resource[0] = &ioport_resource;
1120 b->resource[1] = &iomem_resource;
1124 dev_create_file_err:
1125 device_unregister(&b->dev);
1127 device_unregister(dev);
1129 down_write(&pci_bus_sem);
1131 up_write(&pci_bus_sem);
1138 struct pci_bus * __devinit pci_scan_bus_parented(struct device *parent,
1139 int bus, struct pci_ops *ops, void *sysdata)
1143 b = pci_create_bus(parent, bus, ops, sysdata);
1145 b->subordinate = pci_scan_child_bus(b);
1148 EXPORT_SYMBOL(pci_scan_bus_parented);
1150 #ifdef CONFIG_HOTPLUG
1151 EXPORT_SYMBOL(pci_add_new_bus);
1152 EXPORT_SYMBOL(pci_scan_slot);
1153 EXPORT_SYMBOL(pci_scan_bridge);
1154 EXPORT_SYMBOL_GPL(pci_scan_child_bus);
1157 static int __init pci_sort_bf_cmp(const struct pci_dev *a, const struct pci_dev *b)
1159 if (pci_domain_nr(a->bus) < pci_domain_nr(b->bus)) return -1;
1160 else if (pci_domain_nr(a->bus) > pci_domain_nr(b->bus)) return 1;
1162 if (a->bus->number < b->bus->number) return -1;
1163 else if (a->bus->number > b->bus->number) return 1;
1165 if (a->devfn < b->devfn) return -1;
1166 else if (a->devfn > b->devfn) return 1;
1172 * Yes, this forcably breaks the klist abstraction temporarily. It
1173 * just wants to sort the klist, not change reference counts and
1174 * take/drop locks rapidly in the process. It does all this while
1175 * holding the lock for the list, so objects can't otherwise be
1176 * added/removed while we're swizzling.
1178 static void __init pci_insertion_sort_klist(struct pci_dev *a, struct list_head *list)
1180 struct list_head *pos;
1181 struct klist_node *n;
1185 list_for_each(pos, list) {
1186 n = container_of(pos, struct klist_node, n_node);
1187 dev = container_of(n, struct device, knode_bus);
1188 b = to_pci_dev(dev);
1189 if (pci_sort_bf_cmp(a, b) <= 0) {
1190 list_move_tail(&a->dev.knode_bus.n_node, &b->dev.knode_bus.n_node);
1194 list_move_tail(&a->dev.knode_bus.n_node, list);
1197 static void __init pci_sort_breadthfirst_klist(void)
1199 LIST_HEAD(sorted_devices);
1200 struct list_head *pos, *tmp;
1201 struct klist_node *n;
1203 struct pci_dev *pdev;
1204 struct klist *device_klist;
1206 device_klist = bus_get_device_klist(&pci_bus_type);
1208 spin_lock(&device_klist->k_lock);
1209 list_for_each_safe(pos, tmp, &device_klist->k_list) {
1210 n = container_of(pos, struct klist_node, n_node);
1211 dev = container_of(n, struct device, knode_bus);
1212 pdev = to_pci_dev(dev);
1213 pci_insertion_sort_klist(pdev, &sorted_devices);
1215 list_splice(&sorted_devices, &device_klist->k_list);
1216 spin_unlock(&device_klist->k_lock);
1219 static void __init pci_insertion_sort_devices(struct pci_dev *a, struct list_head *list)
1223 list_for_each_entry(b, list, global_list) {
1224 if (pci_sort_bf_cmp(a, b) <= 0) {
1225 list_move_tail(&a->global_list, &b->global_list);
1229 list_move_tail(&a->global_list, list);
1232 static void __init pci_sort_breadthfirst_devices(void)
1234 LIST_HEAD(sorted_devices);
1235 struct pci_dev *dev, *tmp;
1237 down_write(&pci_bus_sem);
1238 list_for_each_entry_safe(dev, tmp, &pci_devices, global_list) {
1239 pci_insertion_sort_devices(dev, &sorted_devices);
1241 list_splice(&sorted_devices, &pci_devices);
1242 up_write(&pci_bus_sem);
1245 void __init pci_sort_breadthfirst(void)
1247 pci_sort_breadthfirst_devices();
1248 pci_sort_breadthfirst_klist();