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,
85 struct device_attribute *attr,
91 cpumask = pcibus_to_cpumask(to_pci_bus(dev));
92 ret = cpumask_scnprintf(buf, PAGE_SIZE, cpumask);
97 DEVICE_ATTR(cpuaffinity, S_IRUGO, pci_bus_show_cpuaffinity, NULL);
102 static void release_pcibus_dev(struct device *dev)
104 struct pci_bus *pci_bus = to_pci_bus(dev);
107 put_device(pci_bus->bridge);
111 static struct class pcibus_class = {
113 .dev_release = &release_pcibus_dev,
116 static int __init pcibus_class_init(void)
118 return class_register(&pcibus_class);
120 postcore_initcall(pcibus_class_init);
123 * Translate the low bits of the PCI base
124 * to the resource type
126 static inline unsigned int pci_calc_resource_flags(unsigned int flags)
128 if (flags & PCI_BASE_ADDRESS_SPACE_IO)
129 return IORESOURCE_IO;
131 if (flags & PCI_BASE_ADDRESS_MEM_PREFETCH)
132 return IORESOURCE_MEM | IORESOURCE_PREFETCH;
134 return IORESOURCE_MEM;
138 * Find the extent of a PCI decode..
140 static u32 pci_size(u32 base, u32 maxbase, u32 mask)
142 u32 size = mask & maxbase; /* Find the significant bits */
146 /* Get the lowest of them to find the decode size, and
147 from that the extent. */
148 size = (size & ~(size-1)) - 1;
150 /* base == maxbase can be valid only if the BAR has
151 already been programmed with all 1s. */
152 if (base == maxbase && ((base | size) & mask) != mask)
158 static u64 pci_size64(u64 base, u64 maxbase, u64 mask)
160 u64 size = mask & maxbase; /* Find the significant bits */
164 /* Get the lowest of them to find the decode size, and
165 from that the extent. */
166 size = (size & ~(size-1)) - 1;
168 /* base == maxbase can be valid only if the BAR has
169 already been programmed with all 1s. */
170 if (base == maxbase && ((base | size) & mask) != mask)
176 static inline int is_64bit_memory(u32 mask)
178 if ((mask & (PCI_BASE_ADDRESS_SPACE|PCI_BASE_ADDRESS_MEM_TYPE_MASK)) ==
179 (PCI_BASE_ADDRESS_SPACE_MEMORY|PCI_BASE_ADDRESS_MEM_TYPE_64))
184 static void pci_read_bases(struct pci_dev *dev, unsigned int howmany, int rom)
186 unsigned int pos, reg, next;
188 struct resource *res;
190 for(pos=0; pos<howmany; pos = next) {
196 res = &dev->resource[pos];
197 res->name = pci_name(dev);
198 reg = PCI_BASE_ADDRESS_0 + (pos << 2);
199 pci_read_config_dword(dev, reg, &l);
200 pci_write_config_dword(dev, reg, ~0);
201 pci_read_config_dword(dev, reg, &sz);
202 pci_write_config_dword(dev, reg, l);
203 if (!sz || sz == 0xffffffff)
208 if ((l & PCI_BASE_ADDRESS_SPACE) ==
209 PCI_BASE_ADDRESS_SPACE_MEMORY) {
210 sz = pci_size(l, sz, (u32)PCI_BASE_ADDRESS_MEM_MASK);
212 * For 64bit prefetchable memory sz could be 0, if the
213 * real size is bigger than 4G, so we need to check
216 if (!is_64bit_memory(l) && !sz)
218 res->start = l & PCI_BASE_ADDRESS_MEM_MASK;
219 res->flags |= l & ~PCI_BASE_ADDRESS_MEM_MASK;
221 sz = pci_size(l, sz, PCI_BASE_ADDRESS_IO_MASK & 0xffff);
224 res->start = l & PCI_BASE_ADDRESS_IO_MASK;
225 res->flags |= l & ~PCI_BASE_ADDRESS_IO_MASK;
227 res->end = res->start + (unsigned long) sz;
228 res->flags |= pci_calc_resource_flags(l);
229 if (is_64bit_memory(l)) {
232 pci_read_config_dword(dev, reg+4, &lhi);
233 pci_write_config_dword(dev, reg+4, ~0);
234 pci_read_config_dword(dev, reg+4, &szhi);
235 pci_write_config_dword(dev, reg+4, lhi);
236 sz64 = ((u64)szhi << 32) | raw_sz;
237 l64 = ((u64)lhi << 32) | l;
238 sz64 = pci_size64(l64, sz64, PCI_BASE_ADDRESS_MEM_MASK);
240 #if BITS_PER_LONG == 64
247 res->start = l64 & PCI_BASE_ADDRESS_MEM_MASK;
248 res->end = res->start + sz64;
250 if (sz64 > 0x100000000ULL) {
251 printk(KERN_ERR "PCI: Unable to handle 64-bit "
252 "BAR for device %s\n", pci_name(dev));
256 /* 64-bit wide address, treat as disabled */
257 pci_write_config_dword(dev, reg,
258 l & ~(u32)PCI_BASE_ADDRESS_MEM_MASK);
259 pci_write_config_dword(dev, reg+4, 0);
267 dev->rom_base_reg = rom;
268 res = &dev->resource[PCI_ROM_RESOURCE];
269 res->name = pci_name(dev);
270 pci_read_config_dword(dev, rom, &l);
271 pci_write_config_dword(dev, rom, ~PCI_ROM_ADDRESS_ENABLE);
272 pci_read_config_dword(dev, rom, &sz);
273 pci_write_config_dword(dev, rom, l);
276 if (sz && sz != 0xffffffff) {
277 sz = pci_size(l, sz, (u32)PCI_ROM_ADDRESS_MASK);
279 res->flags = (l & IORESOURCE_ROM_ENABLE) |
280 IORESOURCE_MEM | IORESOURCE_PREFETCH |
281 IORESOURCE_READONLY | IORESOURCE_CACHEABLE;
282 res->start = l & PCI_ROM_ADDRESS_MASK;
283 res->end = res->start + (unsigned long) sz;
289 void pci_read_bridge_bases(struct pci_bus *child)
291 struct pci_dev *dev = child->self;
292 u8 io_base_lo, io_limit_lo;
293 u16 mem_base_lo, mem_limit_lo;
294 unsigned long base, limit;
295 struct resource *res;
298 if (!dev) /* It's a host bus, nothing to read */
301 if (dev->transparent) {
302 printk(KERN_INFO "PCI: Transparent bridge - %s\n", pci_name(dev));
303 for(i = 3; i < PCI_BUS_NUM_RESOURCES; i++)
304 child->resource[i] = child->parent->resource[i - 3];
308 child->resource[i] = &dev->resource[PCI_BRIDGE_RESOURCES+i];
310 res = child->resource[0];
311 pci_read_config_byte(dev, PCI_IO_BASE, &io_base_lo);
312 pci_read_config_byte(dev, PCI_IO_LIMIT, &io_limit_lo);
313 base = (io_base_lo & PCI_IO_RANGE_MASK) << 8;
314 limit = (io_limit_lo & PCI_IO_RANGE_MASK) << 8;
316 if ((io_base_lo & PCI_IO_RANGE_TYPE_MASK) == PCI_IO_RANGE_TYPE_32) {
317 u16 io_base_hi, io_limit_hi;
318 pci_read_config_word(dev, PCI_IO_BASE_UPPER16, &io_base_hi);
319 pci_read_config_word(dev, PCI_IO_LIMIT_UPPER16, &io_limit_hi);
320 base |= (io_base_hi << 16);
321 limit |= (io_limit_hi << 16);
325 res->flags = (io_base_lo & PCI_IO_RANGE_TYPE_MASK) | IORESOURCE_IO;
329 res->end = limit + 0xfff;
332 res = child->resource[1];
333 pci_read_config_word(dev, PCI_MEMORY_BASE, &mem_base_lo);
334 pci_read_config_word(dev, PCI_MEMORY_LIMIT, &mem_limit_lo);
335 base = (mem_base_lo & PCI_MEMORY_RANGE_MASK) << 16;
336 limit = (mem_limit_lo & PCI_MEMORY_RANGE_MASK) << 16;
338 res->flags = (mem_base_lo & PCI_MEMORY_RANGE_TYPE_MASK) | IORESOURCE_MEM;
340 res->end = limit + 0xfffff;
343 res = child->resource[2];
344 pci_read_config_word(dev, PCI_PREF_MEMORY_BASE, &mem_base_lo);
345 pci_read_config_word(dev, PCI_PREF_MEMORY_LIMIT, &mem_limit_lo);
346 base = (mem_base_lo & PCI_PREF_RANGE_MASK) << 16;
347 limit = (mem_limit_lo & PCI_PREF_RANGE_MASK) << 16;
349 if ((mem_base_lo & PCI_PREF_RANGE_TYPE_MASK) == PCI_PREF_RANGE_TYPE_64) {
350 u32 mem_base_hi, mem_limit_hi;
351 pci_read_config_dword(dev, PCI_PREF_BASE_UPPER32, &mem_base_hi);
352 pci_read_config_dword(dev, PCI_PREF_LIMIT_UPPER32, &mem_limit_hi);
355 * Some bridges set the base > limit by default, and some
356 * (broken) BIOSes do not initialize them. If we find
357 * this, just assume they are not being used.
359 if (mem_base_hi <= mem_limit_hi) {
360 #if BITS_PER_LONG == 64
361 base |= ((long) mem_base_hi) << 32;
362 limit |= ((long) mem_limit_hi) << 32;
364 if (mem_base_hi || mem_limit_hi) {
365 printk(KERN_ERR "PCI: Unable to handle 64-bit address space for bridge %s\n", pci_name(dev));
372 res->flags = (mem_base_lo & PCI_MEMORY_RANGE_TYPE_MASK) | IORESOURCE_MEM | IORESOURCE_PREFETCH;
374 res->end = limit + 0xfffff;
378 static struct pci_bus * pci_alloc_bus(void)
382 b = kzalloc(sizeof(*b), GFP_KERNEL);
384 INIT_LIST_HEAD(&b->node);
385 INIT_LIST_HEAD(&b->children);
386 INIT_LIST_HEAD(&b->devices);
391 static struct pci_bus * __devinit
392 pci_alloc_child_bus(struct pci_bus *parent, struct pci_dev *bridge, int busnr)
394 struct pci_bus *child;
398 * Allocate a new bus, and inherit stuff from the parent..
400 child = pci_alloc_bus();
404 child->self = bridge;
405 child->parent = parent;
406 child->ops = parent->ops;
407 child->sysdata = parent->sysdata;
408 child->bus_flags = parent->bus_flags;
409 child->bridge = get_device(&bridge->dev);
411 /* initialize some portions of the bus device, but don't register it
412 * now as the parent is not properly set up yet. This device will get
413 * registered later in pci_bus_add_devices()
415 child->dev.class = &pcibus_class;
416 sprintf(child->dev.bus_id, "%04x:%02x", pci_domain_nr(child), busnr);
419 * Set up the primary, secondary and subordinate
422 child->number = child->secondary = busnr;
423 child->primary = parent->secondary;
424 child->subordinate = 0xff;
426 /* Set up default resource pointers and names.. */
427 for (i = 0; i < 4; i++) {
428 child->resource[i] = &bridge->resource[PCI_BRIDGE_RESOURCES+i];
429 child->resource[i]->name = child->name;
431 bridge->subordinate = child;
436 struct pci_bus *__ref pci_add_new_bus(struct pci_bus *parent, struct pci_dev *dev, int busnr)
438 struct pci_bus *child;
440 child = pci_alloc_child_bus(parent, dev, busnr);
442 down_write(&pci_bus_sem);
443 list_add_tail(&child->node, &parent->children);
444 up_write(&pci_bus_sem);
449 static void pci_fixup_parent_subordinate_busnr(struct pci_bus *child, int max)
451 struct pci_bus *parent = child->parent;
453 /* Attempts to fix that up are really dangerous unless
454 we're going to re-assign all bus numbers. */
455 if (!pcibios_assign_all_busses())
458 while (parent->parent && parent->subordinate < max) {
459 parent->subordinate = max;
460 pci_write_config_byte(parent->self, PCI_SUBORDINATE_BUS, max);
461 parent = parent->parent;
466 * If it's a bridge, configure it and scan the bus behind it.
467 * For CardBus bridges, we don't scan behind as the devices will
468 * be handled by the bridge driver itself.
470 * We need to process bridges in two passes -- first we scan those
471 * already configured by the BIOS and after we are done with all of
472 * them, we proceed to assigning numbers to the remaining buses in
473 * order to avoid overlaps between old and new bus numbers.
475 int pci_scan_bridge(struct pci_bus *bus, struct pci_dev * dev, int max, int pass)
477 struct pci_bus *child;
478 int is_cardbus = (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS);
482 pci_read_config_dword(dev, PCI_PRIMARY_BUS, &buses);
484 pr_debug("PCI: Scanning behind PCI bridge %s, config %06x, pass %d\n",
485 pci_name(dev), buses & 0xffffff, pass);
487 /* Disable MasterAbortMode during probing to avoid reporting
488 of bus errors (in some architectures) */
489 pci_read_config_word(dev, PCI_BRIDGE_CONTROL, &bctl);
490 pci_write_config_word(dev, PCI_BRIDGE_CONTROL,
491 bctl & ~PCI_BRIDGE_CTL_MASTER_ABORT);
493 if ((buses & 0xffff00) && !pcibios_assign_all_busses() && !is_cardbus) {
494 unsigned int cmax, busnr;
496 * Bus already configured by firmware, process it in the first
497 * pass and just note the configuration.
501 busnr = (buses >> 8) & 0xFF;
504 * If we already got to this bus through a different bridge,
505 * ignore it. This can happen with the i450NX chipset.
507 if (pci_find_bus(pci_domain_nr(bus), busnr)) {
508 printk(KERN_INFO "PCI: Bus %04x:%02x already known\n",
509 pci_domain_nr(bus), busnr);
513 child = pci_add_new_bus(bus, dev, busnr);
516 child->primary = buses & 0xFF;
517 child->subordinate = (buses >> 16) & 0xFF;
518 child->bridge_ctl = bctl;
520 cmax = pci_scan_child_bus(child);
523 if (child->subordinate > max)
524 max = child->subordinate;
527 * We need to assign a number to this bus which we always
528 * do in the second pass.
531 if (pcibios_assign_all_busses())
532 /* Temporarily disable forwarding of the
533 configuration cycles on all bridges in
534 this bus segment to avoid possible
535 conflicts in the second pass between two
536 bridges programmed with overlapping
538 pci_write_config_dword(dev, PCI_PRIMARY_BUS,
544 pci_write_config_word(dev, PCI_STATUS, 0xffff);
546 /* Prevent assigning a bus number that already exists.
547 * This can happen when a bridge is hot-plugged */
548 if (pci_find_bus(pci_domain_nr(bus), max+1))
550 child = pci_add_new_bus(bus, dev, ++max);
551 buses = (buses & 0xff000000)
552 | ((unsigned int)(child->primary) << 0)
553 | ((unsigned int)(child->secondary) << 8)
554 | ((unsigned int)(child->subordinate) << 16);
557 * yenta.c forces a secondary latency timer of 176.
558 * Copy that behaviour here.
561 buses &= ~0xff000000;
562 buses |= CARDBUS_LATENCY_TIMER << 24;
566 * We need to blast all three values with a single write.
568 pci_write_config_dword(dev, PCI_PRIMARY_BUS, buses);
571 child->bridge_ctl = bctl;
573 * Adjust subordinate busnr in parent buses.
574 * We do this before scanning for children because
575 * some devices may not be detected if the bios
578 pci_fixup_parent_subordinate_busnr(child, max);
579 /* Now we can scan all subordinate buses... */
580 max = pci_scan_child_bus(child);
582 * now fix it up again since we have found
583 * the real value of max.
585 pci_fixup_parent_subordinate_busnr(child, max);
588 * For CardBus bridges, we leave 4 bus numbers
589 * as cards with a PCI-to-PCI bridge can be
592 for (i=0; i<CARDBUS_RESERVE_BUSNR; i++) {
593 struct pci_bus *parent = bus;
594 if (pci_find_bus(pci_domain_nr(bus),
597 while (parent->parent) {
598 if ((!pcibios_assign_all_busses()) &&
599 (parent->subordinate > max) &&
600 (parent->subordinate <= max+i)) {
603 parent = parent->parent;
607 * Often, there are two cardbus bridges
608 * -- try to leave one valid bus number
616 pci_fixup_parent_subordinate_busnr(child, max);
619 * Set the subordinate bus number to its real value.
621 child->subordinate = max;
622 pci_write_config_byte(dev, PCI_SUBORDINATE_BUS, max);
625 sprintf(child->name, (is_cardbus ? "PCI CardBus #%02x" : "PCI Bus #%02x"), child->number);
627 /* Has only triggered on CardBus, fixup is in yenta_socket */
628 while (bus->parent) {
629 if ((child->subordinate > bus->subordinate) ||
630 (child->number > bus->subordinate) ||
631 (child->number < bus->number) ||
632 (child->subordinate < bus->number)) {
633 pr_debug("PCI: Bus #%02x (-#%02x) is %s "
634 "hidden behind%s bridge #%02x (-#%02x)\n",
635 child->number, child->subordinate,
636 (bus->number > child->subordinate &&
637 bus->subordinate < child->number) ?
638 "wholly" : "partially",
639 bus->self->transparent ? " transparent" : "",
640 bus->number, bus->subordinate);
646 pci_write_config_word(dev, PCI_BRIDGE_CONTROL, bctl);
652 * Read interrupt line and base address registers.
653 * The architecture-dependent code can tweak these, of course.
655 static void pci_read_irq(struct pci_dev *dev)
659 pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &irq);
662 pci_read_config_byte(dev, PCI_INTERRUPT_LINE, &irq);
666 #define LEGACY_IO_RESOURCE (IORESOURCE_IO | IORESOURCE_PCI_FIXED)
669 * pci_setup_device - fill in class and map information of a device
670 * @dev: the device structure to fill
672 * Initialize the device structure with information about the device's
673 * vendor,class,memory and IO-space addresses,IRQ lines etc.
674 * Called at initialisation of the PCI subsystem and by CardBus services.
675 * Returns 0 on success and -1 if unknown type of device (not normal, bridge
678 static int pci_setup_device(struct pci_dev * dev)
682 sprintf(pci_name(dev), "%04x:%02x:%02x.%d", pci_domain_nr(dev->bus),
683 dev->bus->number, PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn));
685 pci_read_config_dword(dev, PCI_CLASS_REVISION, &class);
686 dev->revision = class & 0xff;
687 class >>= 8; /* upper 3 bytes */
691 pr_debug("PCI: Found %s [%04x/%04x] %06x %02x\n", pci_name(dev),
692 dev->vendor, dev->device, class, dev->hdr_type);
694 /* "Unknown power state" */
695 dev->current_state = PCI_UNKNOWN;
697 /* Early fixups, before probing the BARs */
698 pci_fixup_device(pci_fixup_early, dev);
699 class = dev->class >> 8;
701 switch (dev->hdr_type) { /* header type */
702 case PCI_HEADER_TYPE_NORMAL: /* standard header */
703 if (class == PCI_CLASS_BRIDGE_PCI)
706 pci_read_bases(dev, 6, PCI_ROM_ADDRESS);
707 pci_read_config_word(dev, PCI_SUBSYSTEM_VENDOR_ID, &dev->subsystem_vendor);
708 pci_read_config_word(dev, PCI_SUBSYSTEM_ID, &dev->subsystem_device);
711 * Do the ugly legacy mode stuff here rather than broken chip
712 * quirk code. Legacy mode ATA controllers have fixed
713 * addresses. These are not always echoed in BAR0-3, and
714 * BAR0-3 in a few cases contain junk!
716 if (class == PCI_CLASS_STORAGE_IDE) {
718 pci_read_config_byte(dev, PCI_CLASS_PROG, &progif);
719 if ((progif & 1) == 0) {
720 dev->resource[0].start = 0x1F0;
721 dev->resource[0].end = 0x1F7;
722 dev->resource[0].flags = LEGACY_IO_RESOURCE;
723 dev->resource[1].start = 0x3F6;
724 dev->resource[1].end = 0x3F6;
725 dev->resource[1].flags = LEGACY_IO_RESOURCE;
727 if ((progif & 4) == 0) {
728 dev->resource[2].start = 0x170;
729 dev->resource[2].end = 0x177;
730 dev->resource[2].flags = LEGACY_IO_RESOURCE;
731 dev->resource[3].start = 0x376;
732 dev->resource[3].end = 0x376;
733 dev->resource[3].flags = LEGACY_IO_RESOURCE;
738 case PCI_HEADER_TYPE_BRIDGE: /* bridge header */
739 if (class != PCI_CLASS_BRIDGE_PCI)
741 /* The PCI-to-PCI bridge spec requires that subtractive
742 decoding (i.e. transparent) bridge must have programming
743 interface code of 0x01. */
745 dev->transparent = ((dev->class & 0xff) == 1);
746 pci_read_bases(dev, 2, PCI_ROM_ADDRESS1);
749 case PCI_HEADER_TYPE_CARDBUS: /* CardBus bridge header */
750 if (class != PCI_CLASS_BRIDGE_CARDBUS)
753 pci_read_bases(dev, 1, 0);
754 pci_read_config_word(dev, PCI_CB_SUBSYSTEM_VENDOR_ID, &dev->subsystem_vendor);
755 pci_read_config_word(dev, PCI_CB_SUBSYSTEM_ID, &dev->subsystem_device);
758 default: /* unknown header */
759 printk(KERN_ERR "PCI: device %s has unknown header type %02x, ignoring.\n",
760 pci_name(dev), dev->hdr_type);
764 printk(KERN_ERR "PCI: %s: class %x doesn't match header type %02x. Ignoring class.\n",
765 pci_name(dev), class, dev->hdr_type);
766 dev->class = PCI_CLASS_NOT_DEFINED;
769 /* We found a fine healthy device, go go go... */
774 * pci_release_dev - free a pci device structure when all users of it are finished.
775 * @dev: device that's been disconnected
777 * Will be called only by the device core when all users of this pci device are
780 static void pci_release_dev(struct device *dev)
782 struct pci_dev *pci_dev;
784 pci_dev = to_pci_dev(dev);
788 static void set_pcie_port_type(struct pci_dev *pdev)
793 pos = pci_find_capability(pdev, PCI_CAP_ID_EXP);
797 pci_read_config_word(pdev, pos + PCI_EXP_FLAGS, ®16);
798 pdev->pcie_type = (reg16 & PCI_EXP_FLAGS_TYPE) >> 4;
802 * pci_cfg_space_size - get the configuration space size of the PCI device.
805 * Regular PCI devices have 256 bytes, but PCI-X 2 and PCI Express devices
806 * have 4096 bytes. Even if the device is capable, that doesn't mean we can
807 * access it. Maybe we don't have a way to generate extended config space
808 * accesses, or the device is behind a reverse Express bridge. So we try
809 * reading the dword at 0x100 which must either be 0 or a valid extended
812 int pci_cfg_space_size(struct pci_dev *dev)
817 pos = pci_find_capability(dev, PCI_CAP_ID_EXP);
819 pos = pci_find_capability(dev, PCI_CAP_ID_PCIX);
823 pci_read_config_dword(dev, pos + PCI_X_STATUS, &status);
824 if (!(status & (PCI_X_STATUS_266MHZ | PCI_X_STATUS_533MHZ)))
828 if (pci_read_config_dword(dev, 256, &status) != PCIBIOS_SUCCESSFUL)
830 if (status == 0xffffffff)
833 return PCI_CFG_SPACE_EXP_SIZE;
836 return PCI_CFG_SPACE_SIZE;
839 static void pci_release_bus_bridge_dev(struct device *dev)
844 struct pci_dev *alloc_pci_dev(void)
848 dev = kzalloc(sizeof(struct pci_dev), GFP_KERNEL);
852 INIT_LIST_HEAD(&dev->global_list);
853 INIT_LIST_HEAD(&dev->bus_list);
855 pci_msi_init_pci_dev(dev);
859 EXPORT_SYMBOL(alloc_pci_dev);
862 * Read the config data for a PCI device, sanity-check it
863 * and fill in the dev structure...
865 static struct pci_dev * __devinit
866 pci_scan_device(struct pci_bus *bus, int devfn)
873 if (pci_bus_read_config_dword(bus, devfn, PCI_VENDOR_ID, &l))
876 /* some broken boards return 0 or ~0 if a slot is empty: */
877 if (l == 0xffffffff || l == 0x00000000 ||
878 l == 0x0000ffff || l == 0xffff0000)
881 /* Configuration request Retry Status */
882 while (l == 0xffff0001) {
885 if (pci_bus_read_config_dword(bus, devfn, PCI_VENDOR_ID, &l))
887 /* Card hasn't responded in 60 seconds? Must be stuck. */
888 if (delay > 60 * 1000) {
889 printk(KERN_WARNING "Device %04x:%02x:%02x.%d not "
890 "responding\n", pci_domain_nr(bus),
891 bus->number, PCI_SLOT(devfn),
897 if (pci_bus_read_config_byte(bus, devfn, PCI_HEADER_TYPE, &hdr_type))
900 dev = alloc_pci_dev();
905 dev->sysdata = bus->sysdata;
906 dev->dev.parent = bus->bridge;
907 dev->dev.bus = &pci_bus_type;
909 dev->hdr_type = hdr_type & 0x7f;
910 dev->multifunction = !!(hdr_type & 0x80);
911 dev->vendor = l & 0xffff;
912 dev->device = (l >> 16) & 0xffff;
913 dev->cfg_size = pci_cfg_space_size(dev);
914 dev->error_state = pci_channel_io_normal;
915 set_pcie_port_type(dev);
917 /* Assume 32-bit PCI; let 64-bit PCI cards (which are far rarer)
918 set this higher, assuming the system even supports it. */
919 dev->dma_mask = 0xffffffff;
920 if (pci_setup_device(dev) < 0) {
928 void pci_device_add(struct pci_dev *dev, struct pci_bus *bus)
930 device_initialize(&dev->dev);
931 dev->dev.release = pci_release_dev;
934 set_dev_node(&dev->dev, pcibus_to_node(bus));
935 dev->dev.dma_mask = &dev->dma_mask;
936 dev->dev.dma_parms = &dev->dma_parms;
937 dev->dev.coherent_dma_mask = 0xffffffffull;
939 pci_set_dma_max_seg_size(dev, 65536);
940 pci_set_dma_seg_boundary(dev, 0xffffffff);
942 /* Fix up broken headers */
943 pci_fixup_device(pci_fixup_header, dev);
946 * Add the device to our list of discovered devices
947 * and the bus list for fixup functions, etc.
949 INIT_LIST_HEAD(&dev->global_list);
950 down_write(&pci_bus_sem);
951 list_add_tail(&dev->bus_list, &bus->devices);
952 up_write(&pci_bus_sem);
955 struct pci_dev *__ref pci_scan_single_device(struct pci_bus *bus, int devfn)
959 dev = pci_scan_device(bus, devfn);
963 pci_device_add(dev, bus);
967 EXPORT_SYMBOL(pci_scan_single_device);
970 * pci_scan_slot - scan a PCI slot on a bus for devices.
971 * @bus: PCI bus to scan
972 * @devfn: slot number to scan (must have zero function.)
974 * Scan a PCI slot on the specified PCI bus for devices, adding
975 * discovered devices to the @bus->devices list. New devices
976 * will have an empty dev->global_list head.
978 int pci_scan_slot(struct pci_bus *bus, int devfn)
983 scan_all_fns = pcibios_scan_all_fns(bus, devfn);
985 for (func = 0; func < 8; func++, devfn++) {
988 dev = pci_scan_single_device(bus, devfn);
993 * If this is a single function device,
994 * don't scan past the first function.
996 if (!dev->multifunction) {
998 dev->multifunction = 1;
1004 if (func == 0 && !scan_all_fns)
1011 unsigned int pci_scan_child_bus(struct pci_bus *bus)
1013 unsigned int devfn, pass, max = bus->secondary;
1014 struct pci_dev *dev;
1016 pr_debug("PCI: Scanning bus %04x:%02x\n", pci_domain_nr(bus), bus->number);
1018 /* Go find them, Rover! */
1019 for (devfn = 0; devfn < 0x100; devfn += 8)
1020 pci_scan_slot(bus, devfn);
1023 * After performing arch-dependent fixup of the bus, look behind
1024 * all PCI-to-PCI bridges on this bus.
1026 pr_debug("PCI: Fixups for bus %04x:%02x\n", pci_domain_nr(bus), bus->number);
1027 pcibios_fixup_bus(bus);
1028 for (pass=0; pass < 2; pass++)
1029 list_for_each_entry(dev, &bus->devices, bus_list) {
1030 if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE ||
1031 dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)
1032 max = pci_scan_bridge(bus, dev, max, pass);
1036 * We've scanned the bus and so we know all about what's on
1037 * the other side of any bridges that may be on this bus plus
1040 * Return how far we've got finding sub-buses.
1042 pr_debug("PCI: Bus scan for %04x:%02x returning with max=%02x\n",
1043 pci_domain_nr(bus), bus->number, max);
1047 struct pci_bus * pci_create_bus(struct device *parent,
1048 int bus, struct pci_ops *ops, void *sysdata)
1054 b = pci_alloc_bus();
1058 dev = kmalloc(sizeof(*dev), GFP_KERNEL);
1064 b->sysdata = sysdata;
1067 if (pci_find_bus(pci_domain_nr(b), bus)) {
1068 /* If we already got to this bus through a different bridge, ignore it */
1069 pr_debug("PCI: Bus %04x:%02x already known\n", pci_domain_nr(b), bus);
1073 down_write(&pci_bus_sem);
1074 list_add_tail(&b->node, &pci_root_buses);
1075 up_write(&pci_bus_sem);
1077 memset(dev, 0, sizeof(*dev));
1078 dev->parent = parent;
1079 dev->release = pci_release_bus_bridge_dev;
1080 sprintf(dev->bus_id, "pci%04x:%02x", pci_domain_nr(b), bus);
1081 error = device_register(dev);
1084 b->bridge = get_device(dev);
1086 b->dev.class = &pcibus_class;
1087 b->dev.parent = b->bridge;
1088 sprintf(b->dev.bus_id, "%04x:%02x", pci_domain_nr(b), bus);
1089 error = device_register(&b->dev);
1091 goto class_dev_reg_err;
1092 error = device_create_file(&b->dev, &dev_attr_cpuaffinity);
1094 goto dev_create_file_err;
1096 /* Create legacy_io and legacy_mem files for this bus */
1097 pci_create_legacy_files(b);
1099 b->number = b->secondary = bus;
1100 b->resource[0] = &ioport_resource;
1101 b->resource[1] = &iomem_resource;
1105 dev_create_file_err:
1106 device_unregister(&b->dev);
1108 device_unregister(dev);
1110 down_write(&pci_bus_sem);
1112 up_write(&pci_bus_sem);
1119 struct pci_bus *pci_scan_bus_parented(struct device *parent,
1120 int bus, struct pci_ops *ops, void *sysdata)
1124 b = pci_create_bus(parent, bus, ops, sysdata);
1126 b->subordinate = pci_scan_child_bus(b);
1129 EXPORT_SYMBOL(pci_scan_bus_parented);
1131 #ifdef CONFIG_HOTPLUG
1132 EXPORT_SYMBOL(pci_add_new_bus);
1133 EXPORT_SYMBOL(pci_scan_slot);
1134 EXPORT_SYMBOL(pci_scan_bridge);
1135 EXPORT_SYMBOL_GPL(pci_scan_child_bus);
1138 static int __init pci_sort_bf_cmp(const struct pci_dev *a, const struct pci_dev *b)
1140 if (pci_domain_nr(a->bus) < pci_domain_nr(b->bus)) return -1;
1141 else if (pci_domain_nr(a->bus) > pci_domain_nr(b->bus)) return 1;
1143 if (a->bus->number < b->bus->number) return -1;
1144 else if (a->bus->number > b->bus->number) return 1;
1146 if (a->devfn < b->devfn) return -1;
1147 else if (a->devfn > b->devfn) return 1;
1153 * Yes, this forcably breaks the klist abstraction temporarily. It
1154 * just wants to sort the klist, not change reference counts and
1155 * take/drop locks rapidly in the process. It does all this while
1156 * holding the lock for the list, so objects can't otherwise be
1157 * added/removed while we're swizzling.
1159 static void __init pci_insertion_sort_klist(struct pci_dev *a, struct list_head *list)
1161 struct list_head *pos;
1162 struct klist_node *n;
1166 list_for_each(pos, list) {
1167 n = container_of(pos, struct klist_node, n_node);
1168 dev = container_of(n, struct device, knode_bus);
1169 b = to_pci_dev(dev);
1170 if (pci_sort_bf_cmp(a, b) <= 0) {
1171 list_move_tail(&a->dev.knode_bus.n_node, &b->dev.knode_bus.n_node);
1175 list_move_tail(&a->dev.knode_bus.n_node, list);
1178 static void __init pci_sort_breadthfirst_klist(void)
1180 LIST_HEAD(sorted_devices);
1181 struct list_head *pos, *tmp;
1182 struct klist_node *n;
1184 struct pci_dev *pdev;
1185 struct klist *device_klist;
1187 device_klist = bus_get_device_klist(&pci_bus_type);
1189 spin_lock(&device_klist->k_lock);
1190 list_for_each_safe(pos, tmp, &device_klist->k_list) {
1191 n = container_of(pos, struct klist_node, n_node);
1192 dev = container_of(n, struct device, knode_bus);
1193 pdev = to_pci_dev(dev);
1194 pci_insertion_sort_klist(pdev, &sorted_devices);
1196 list_splice(&sorted_devices, &device_klist->k_list);
1197 spin_unlock(&device_klist->k_lock);
1200 static void __init pci_insertion_sort_devices(struct pci_dev *a, struct list_head *list)
1204 list_for_each_entry(b, list, global_list) {
1205 if (pci_sort_bf_cmp(a, b) <= 0) {
1206 list_move_tail(&a->global_list, &b->global_list);
1210 list_move_tail(&a->global_list, list);
1213 static void __init pci_sort_breadthfirst_devices(void)
1215 LIST_HEAD(sorted_devices);
1216 struct pci_dev *dev, *tmp;
1218 down_write(&pci_bus_sem);
1219 list_for_each_entry_safe(dev, tmp, &pci_devices, global_list) {
1220 pci_insertion_sort_devices(dev, &sorted_devices);
1222 list_splice(&sorted_devices, &pci_devices);
1223 up_write(&pci_bus_sem);
1226 void __init pci_sort_breadthfirst(void)
1228 pci_sort_breadthfirst_devices();
1229 pci_sort_breadthfirst_klist();