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 static void pci_create_legacy_files(struct pci_bus *b)
58 b->legacy_io = kzalloc(sizeof(struct bin_attribute) * 2,
61 b->legacy_io->attr.name = "legacy_io";
62 b->legacy_io->size = 0xffff;
63 b->legacy_io->attr.mode = S_IRUSR | S_IWUSR;
64 b->legacy_io->read = pci_read_legacy_io;
65 b->legacy_io->write = pci_write_legacy_io;
66 device_create_bin_file(&b->dev, b->legacy_io);
68 /* Allocated above after the legacy_io struct */
69 b->legacy_mem = b->legacy_io + 1;
70 b->legacy_mem->attr.name = "legacy_mem";
71 b->legacy_mem->size = 1024*1024;
72 b->legacy_mem->attr.mode = S_IRUSR | S_IWUSR;
73 b->legacy_mem->mmap = pci_mmap_legacy_mem;
74 device_create_bin_file(&b->dev, b->legacy_mem);
78 void pci_remove_legacy_files(struct pci_bus *b)
81 device_remove_bin_file(&b->dev, b->legacy_io);
82 device_remove_bin_file(&b->dev, b->legacy_mem);
83 kfree(b->legacy_io); /* both are allocated here */
86 #else /* !HAVE_PCI_LEGACY */
87 static inline void pci_create_legacy_files(struct pci_bus *bus) { return; }
88 void pci_remove_legacy_files(struct pci_bus *bus) { return; }
89 #endif /* HAVE_PCI_LEGACY */
92 * PCI Bus Class Devices
94 static ssize_t pci_bus_show_cpuaffinity(struct device *dev,
96 struct device_attribute *attr,
102 cpumask = pcibus_to_cpumask(to_pci_bus(dev));
104 cpulist_scnprintf(buf, PAGE_SIZE-2, cpumask):
105 cpumask_scnprintf(buf, PAGE_SIZE-2, cpumask);
111 static ssize_t inline pci_bus_show_cpumaskaffinity(struct device *dev,
112 struct device_attribute *attr,
115 return pci_bus_show_cpuaffinity(dev, 0, attr, buf);
118 static ssize_t inline pci_bus_show_cpulistaffinity(struct device *dev,
119 struct device_attribute *attr,
122 return pci_bus_show_cpuaffinity(dev, 1, attr, buf);
125 DEVICE_ATTR(cpuaffinity, S_IRUGO, pci_bus_show_cpumaskaffinity, NULL);
126 DEVICE_ATTR(cpulistaffinity, S_IRUGO, pci_bus_show_cpulistaffinity, NULL);
131 static void release_pcibus_dev(struct device *dev)
133 struct pci_bus *pci_bus = to_pci_bus(dev);
136 put_device(pci_bus->bridge);
140 static struct class pcibus_class = {
142 .dev_release = &release_pcibus_dev,
145 static int __init pcibus_class_init(void)
147 return class_register(&pcibus_class);
149 postcore_initcall(pcibus_class_init);
152 * Translate the low bits of the PCI base
153 * to the resource type
155 static inline unsigned int pci_calc_resource_flags(unsigned int flags)
157 if (flags & PCI_BASE_ADDRESS_SPACE_IO)
158 return IORESOURCE_IO;
160 if (flags & PCI_BASE_ADDRESS_MEM_PREFETCH)
161 return IORESOURCE_MEM | IORESOURCE_PREFETCH;
163 return IORESOURCE_MEM;
167 * Find the extent of a PCI decode..
169 static u32 pci_size(u32 base, u32 maxbase, u32 mask)
171 u32 size = mask & maxbase; /* Find the significant bits */
175 /* Get the lowest of them to find the decode size, and
176 from that the extent. */
177 size = (size & ~(size-1)) - 1;
179 /* base == maxbase can be valid only if the BAR has
180 already been programmed with all 1s. */
181 if (base == maxbase && ((base | size) & mask) != mask)
187 static u64 pci_size64(u64 base, u64 maxbase, u64 mask)
189 u64 size = mask & maxbase; /* Find the significant bits */
193 /* Get the lowest of them to find the decode size, and
194 from that the extent. */
195 size = (size & ~(size-1)) - 1;
197 /* base == maxbase can be valid only if the BAR has
198 already been programmed with all 1s. */
199 if (base == maxbase && ((base | size) & mask) != mask)
205 static inline int is_64bit_memory(u32 mask)
207 if ((mask & (PCI_BASE_ADDRESS_SPACE|PCI_BASE_ADDRESS_MEM_TYPE_MASK)) ==
208 (PCI_BASE_ADDRESS_SPACE_MEMORY|PCI_BASE_ADDRESS_MEM_TYPE_64))
213 static void pci_read_bases(struct pci_dev *dev, unsigned int howmany, int rom)
215 unsigned int pos, reg, next;
217 struct resource *res;
219 for(pos=0; pos<howmany; pos = next) {
225 res = &dev->resource[pos];
226 res->name = pci_name(dev);
227 reg = PCI_BASE_ADDRESS_0 + (pos << 2);
228 pci_read_config_dword(dev, reg, &l);
229 pci_write_config_dword(dev, reg, ~0);
230 pci_read_config_dword(dev, reg, &sz);
231 pci_write_config_dword(dev, reg, l);
232 if (!sz || sz == 0xffffffff)
237 if ((l & PCI_BASE_ADDRESS_SPACE) ==
238 PCI_BASE_ADDRESS_SPACE_MEMORY) {
239 sz = pci_size(l, sz, (u32)PCI_BASE_ADDRESS_MEM_MASK);
241 * For 64bit prefetchable memory sz could be 0, if the
242 * real size is bigger than 4G, so we need to check
245 if (!is_64bit_memory(l) && !sz)
247 res->start = l & PCI_BASE_ADDRESS_MEM_MASK;
248 res->flags |= l & ~PCI_BASE_ADDRESS_MEM_MASK;
250 sz = pci_size(l, sz, PCI_BASE_ADDRESS_IO_MASK & 0xffff);
253 res->start = l & PCI_BASE_ADDRESS_IO_MASK;
254 res->flags |= l & ~PCI_BASE_ADDRESS_IO_MASK;
256 res->end = res->start + (unsigned long) sz;
257 res->flags |= pci_calc_resource_flags(l) | IORESOURCE_SIZEALIGN;
258 if (is_64bit_memory(l)) {
261 pci_read_config_dword(dev, reg+4, &lhi);
262 pci_write_config_dword(dev, reg+4, ~0);
263 pci_read_config_dword(dev, reg+4, &szhi);
264 pci_write_config_dword(dev, reg+4, lhi);
265 sz64 = ((u64)szhi << 32) | raw_sz;
266 l64 = ((u64)lhi << 32) | l;
267 sz64 = pci_size64(l64, sz64, PCI_BASE_ADDRESS_MEM_MASK);
269 #if BITS_PER_LONG == 64
276 res->start = l64 & PCI_BASE_ADDRESS_MEM_MASK;
277 res->end = res->start + sz64;
278 printk(KERN_INFO "PCI: %s reg %x 64bit mmio: [%llx, %llx]\n", pci_name(dev), reg, res->start, res->end);
280 if (sz64 > 0x100000000ULL) {
281 printk(KERN_ERR "PCI: Unable to handle 64-bit "
282 "BAR for device %s\n", pci_name(dev));
286 /* 64-bit wide address, treat as disabled */
287 pci_write_config_dword(dev, reg,
288 l & ~(u32)PCI_BASE_ADDRESS_MEM_MASK);
289 pci_write_config_dword(dev, reg+4, 0);
295 printk(KERN_INFO "PCI: %s reg %x %s: [%llx, %llx]\n", pci_name(dev), reg, (res->flags & IORESOURCE_IO)? "io port":"32bit mmio", res->start, res->end);
299 dev->rom_base_reg = rom;
300 res = &dev->resource[PCI_ROM_RESOURCE];
301 res->name = pci_name(dev);
302 pci_read_config_dword(dev, rom, &l);
303 pci_write_config_dword(dev, rom, ~PCI_ROM_ADDRESS_ENABLE);
304 pci_read_config_dword(dev, rom, &sz);
305 pci_write_config_dword(dev, rom, l);
308 if (sz && sz != 0xffffffff) {
309 sz = pci_size(l, sz, (u32)PCI_ROM_ADDRESS_MASK);
311 res->flags = (l & IORESOURCE_ROM_ENABLE) |
312 IORESOURCE_MEM | IORESOURCE_PREFETCH |
313 IORESOURCE_READONLY | IORESOURCE_CACHEABLE |
314 IORESOURCE_SIZEALIGN;
315 res->start = l & PCI_ROM_ADDRESS_MASK;
316 res->end = res->start + (unsigned long) sz;
322 void __devinit pci_read_bridge_bases(struct pci_bus *child)
324 struct pci_dev *dev = child->self;
325 u8 io_base_lo, io_limit_lo;
326 u16 mem_base_lo, mem_limit_lo;
327 unsigned long base, limit;
328 struct resource *res;
331 if (!dev) /* It's a host bus, nothing to read */
334 if (dev->transparent) {
335 printk(KERN_INFO "PCI: Transparent bridge - %s\n", pci_name(dev));
336 for(i = 3; i < PCI_BUS_NUM_RESOURCES; i++)
337 child->resource[i] = child->parent->resource[i - 3];
341 child->resource[i] = &dev->resource[PCI_BRIDGE_RESOURCES+i];
343 res = child->resource[0];
344 pci_read_config_byte(dev, PCI_IO_BASE, &io_base_lo);
345 pci_read_config_byte(dev, PCI_IO_LIMIT, &io_limit_lo);
346 base = (io_base_lo & PCI_IO_RANGE_MASK) << 8;
347 limit = (io_limit_lo & PCI_IO_RANGE_MASK) << 8;
349 if ((io_base_lo & PCI_IO_RANGE_TYPE_MASK) == PCI_IO_RANGE_TYPE_32) {
350 u16 io_base_hi, io_limit_hi;
351 pci_read_config_word(dev, PCI_IO_BASE_UPPER16, &io_base_hi);
352 pci_read_config_word(dev, PCI_IO_LIMIT_UPPER16, &io_limit_hi);
353 base |= (io_base_hi << 16);
354 limit |= (io_limit_hi << 16);
358 res->flags = (io_base_lo & PCI_IO_RANGE_TYPE_MASK) | IORESOURCE_IO;
362 res->end = limit + 0xfff;
363 printk(KERN_INFO "PCI: bridge %s io port: [%llx, %llx]\n", pci_name(dev), res->start, res->end);
366 res = child->resource[1];
367 pci_read_config_word(dev, PCI_MEMORY_BASE, &mem_base_lo);
368 pci_read_config_word(dev, PCI_MEMORY_LIMIT, &mem_limit_lo);
369 base = (mem_base_lo & PCI_MEMORY_RANGE_MASK) << 16;
370 limit = (mem_limit_lo & PCI_MEMORY_RANGE_MASK) << 16;
372 res->flags = (mem_base_lo & PCI_MEMORY_RANGE_TYPE_MASK) | IORESOURCE_MEM;
374 res->end = limit + 0xfffff;
375 printk(KERN_INFO "PCI: bridge %s 32bit mmio: [%llx, %llx]\n", pci_name(dev), res->start, res->end);
378 res = child->resource[2];
379 pci_read_config_word(dev, PCI_PREF_MEMORY_BASE, &mem_base_lo);
380 pci_read_config_word(dev, PCI_PREF_MEMORY_LIMIT, &mem_limit_lo);
381 base = (mem_base_lo & PCI_PREF_RANGE_MASK) << 16;
382 limit = (mem_limit_lo & PCI_PREF_RANGE_MASK) << 16;
384 if ((mem_base_lo & PCI_PREF_RANGE_TYPE_MASK) == PCI_PREF_RANGE_TYPE_64) {
385 u32 mem_base_hi, mem_limit_hi;
386 pci_read_config_dword(dev, PCI_PREF_BASE_UPPER32, &mem_base_hi);
387 pci_read_config_dword(dev, PCI_PREF_LIMIT_UPPER32, &mem_limit_hi);
390 * Some bridges set the base > limit by default, and some
391 * (broken) BIOSes do not initialize them. If we find
392 * this, just assume they are not being used.
394 if (mem_base_hi <= mem_limit_hi) {
395 #if BITS_PER_LONG == 64
396 base |= ((long) mem_base_hi) << 32;
397 limit |= ((long) mem_limit_hi) << 32;
399 if (mem_base_hi || mem_limit_hi) {
400 printk(KERN_ERR "PCI: Unable to handle 64-bit address space for bridge %s\n", pci_name(dev));
407 res->flags = (mem_base_lo & PCI_MEMORY_RANGE_TYPE_MASK) | IORESOURCE_MEM | IORESOURCE_PREFETCH;
409 res->end = limit + 0xfffff;
410 printk(KERN_INFO "PCI: bridge %s %sbit mmio pref: [%llx, %llx]\n", pci_name(dev), (res->flags & PCI_PREF_RANGE_TYPE_64)?"64":"32",res->start, res->end);
414 static struct pci_bus * pci_alloc_bus(void)
418 b = kzalloc(sizeof(*b), GFP_KERNEL);
420 INIT_LIST_HEAD(&b->node);
421 INIT_LIST_HEAD(&b->children);
422 INIT_LIST_HEAD(&b->devices);
427 static struct pci_bus *pci_alloc_child_bus(struct pci_bus *parent,
428 struct pci_dev *bridge, int busnr)
430 struct pci_bus *child;
434 * Allocate a new bus, and inherit stuff from the parent..
436 child = pci_alloc_bus();
440 child->self = bridge;
441 child->parent = parent;
442 child->ops = parent->ops;
443 child->sysdata = parent->sysdata;
444 child->bus_flags = parent->bus_flags;
445 child->bridge = get_device(&bridge->dev);
447 /* initialize some portions of the bus device, but don't register it
448 * now as the parent is not properly set up yet. This device will get
449 * registered later in pci_bus_add_devices()
451 child->dev.class = &pcibus_class;
452 sprintf(child->dev.bus_id, "%04x:%02x", pci_domain_nr(child), busnr);
455 * Set up the primary, secondary and subordinate
458 child->number = child->secondary = busnr;
459 child->primary = parent->secondary;
460 child->subordinate = 0xff;
462 /* Set up default resource pointers and names.. */
463 for (i = 0; i < 4; i++) {
464 child->resource[i] = &bridge->resource[PCI_BRIDGE_RESOURCES+i];
465 child->resource[i]->name = child->name;
467 bridge->subordinate = child;
472 struct pci_bus *__ref pci_add_new_bus(struct pci_bus *parent, struct pci_dev *dev, int busnr)
474 struct pci_bus *child;
476 child = pci_alloc_child_bus(parent, dev, busnr);
478 down_write(&pci_bus_sem);
479 list_add_tail(&child->node, &parent->children);
480 up_write(&pci_bus_sem);
485 static void pci_fixup_parent_subordinate_busnr(struct pci_bus *child, int max)
487 struct pci_bus *parent = child->parent;
489 /* Attempts to fix that up are really dangerous unless
490 we're going to re-assign all bus numbers. */
491 if (!pcibios_assign_all_busses())
494 while (parent->parent && parent->subordinate < max) {
495 parent->subordinate = max;
496 pci_write_config_byte(parent->self, PCI_SUBORDINATE_BUS, max);
497 parent = parent->parent;
502 * If it's a bridge, configure it and scan the bus behind it.
503 * For CardBus bridges, we don't scan behind as the devices will
504 * be handled by the bridge driver itself.
506 * We need to process bridges in two passes -- first we scan those
507 * already configured by the BIOS and after we are done with all of
508 * them, we proceed to assigning numbers to the remaining buses in
509 * order to avoid overlaps between old and new bus numbers.
511 int __devinit pci_scan_bridge(struct pci_bus *bus, struct pci_dev *dev, int max, int pass)
513 struct pci_bus *child;
514 int is_cardbus = (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS);
518 pci_read_config_dword(dev, PCI_PRIMARY_BUS, &buses);
520 pr_debug("PCI: Scanning behind PCI bridge %s, config %06x, pass %d\n",
521 pci_name(dev), buses & 0xffffff, pass);
523 /* Disable MasterAbortMode during probing to avoid reporting
524 of bus errors (in some architectures) */
525 pci_read_config_word(dev, PCI_BRIDGE_CONTROL, &bctl);
526 pci_write_config_word(dev, PCI_BRIDGE_CONTROL,
527 bctl & ~PCI_BRIDGE_CTL_MASTER_ABORT);
529 if ((buses & 0xffff00) && !pcibios_assign_all_busses() && !is_cardbus) {
530 unsigned int cmax, busnr;
532 * Bus already configured by firmware, process it in the first
533 * pass and just note the configuration.
537 busnr = (buses >> 8) & 0xFF;
540 * If we already got to this bus through a different bridge,
541 * ignore it. This can happen with the i450NX chipset.
543 if (pci_find_bus(pci_domain_nr(bus), busnr)) {
544 printk(KERN_INFO "PCI: Bus %04x:%02x already known\n",
545 pci_domain_nr(bus), busnr);
549 child = pci_add_new_bus(bus, dev, busnr);
552 child->primary = buses & 0xFF;
553 child->subordinate = (buses >> 16) & 0xFF;
554 child->bridge_ctl = bctl;
556 cmax = pci_scan_child_bus(child);
559 if (child->subordinate > max)
560 max = child->subordinate;
563 * We need to assign a number to this bus which we always
564 * do in the second pass.
567 if (pcibios_assign_all_busses())
568 /* Temporarily disable forwarding of the
569 configuration cycles on all bridges in
570 this bus segment to avoid possible
571 conflicts in the second pass between two
572 bridges programmed with overlapping
574 pci_write_config_dword(dev, PCI_PRIMARY_BUS,
580 pci_write_config_word(dev, PCI_STATUS, 0xffff);
582 /* Prevent assigning a bus number that already exists.
583 * This can happen when a bridge is hot-plugged */
584 if (pci_find_bus(pci_domain_nr(bus), max+1))
586 child = pci_add_new_bus(bus, dev, ++max);
587 buses = (buses & 0xff000000)
588 | ((unsigned int)(child->primary) << 0)
589 | ((unsigned int)(child->secondary) << 8)
590 | ((unsigned int)(child->subordinate) << 16);
593 * yenta.c forces a secondary latency timer of 176.
594 * Copy that behaviour here.
597 buses &= ~0xff000000;
598 buses |= CARDBUS_LATENCY_TIMER << 24;
602 * We need to blast all three values with a single write.
604 pci_write_config_dword(dev, PCI_PRIMARY_BUS, buses);
607 child->bridge_ctl = bctl;
609 * Adjust subordinate busnr in parent buses.
610 * We do this before scanning for children because
611 * some devices may not be detected if the bios
614 pci_fixup_parent_subordinate_busnr(child, max);
615 /* Now we can scan all subordinate buses... */
616 max = pci_scan_child_bus(child);
618 * now fix it up again since we have found
619 * the real value of max.
621 pci_fixup_parent_subordinate_busnr(child, max);
624 * For CardBus bridges, we leave 4 bus numbers
625 * as cards with a PCI-to-PCI bridge can be
628 for (i=0; i<CARDBUS_RESERVE_BUSNR; i++) {
629 struct pci_bus *parent = bus;
630 if (pci_find_bus(pci_domain_nr(bus),
633 while (parent->parent) {
634 if ((!pcibios_assign_all_busses()) &&
635 (parent->subordinate > max) &&
636 (parent->subordinate <= max+i)) {
639 parent = parent->parent;
643 * Often, there are two cardbus bridges
644 * -- try to leave one valid bus number
652 pci_fixup_parent_subordinate_busnr(child, max);
655 * Set the subordinate bus number to its real value.
657 child->subordinate = max;
658 pci_write_config_byte(dev, PCI_SUBORDINATE_BUS, max);
662 (is_cardbus ? "PCI CardBus %04x:%02x" : "PCI Bus %04x:%02x"),
663 pci_domain_nr(bus), child->number);
665 /* Has only triggered on CardBus, fixup is in yenta_socket */
666 while (bus->parent) {
667 if ((child->subordinate > bus->subordinate) ||
668 (child->number > bus->subordinate) ||
669 (child->number < bus->number) ||
670 (child->subordinate < bus->number)) {
671 pr_debug("PCI: Bus #%02x (-#%02x) is %s "
672 "hidden behind%s bridge #%02x (-#%02x)\n",
673 child->number, child->subordinate,
674 (bus->number > child->subordinate &&
675 bus->subordinate < child->number) ?
676 "wholly" : "partially",
677 bus->self->transparent ? " transparent" : "",
678 bus->number, bus->subordinate);
684 pci_write_config_word(dev, PCI_BRIDGE_CONTROL, bctl);
690 * Read interrupt line and base address registers.
691 * The architecture-dependent code can tweak these, of course.
693 static void pci_read_irq(struct pci_dev *dev)
697 pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &irq);
700 pci_read_config_byte(dev, PCI_INTERRUPT_LINE, &irq);
704 #define LEGACY_IO_RESOURCE (IORESOURCE_IO | IORESOURCE_PCI_FIXED)
707 * pci_setup_device - fill in class and map information of a device
708 * @dev: the device structure to fill
710 * Initialize the device structure with information about the device's
711 * vendor,class,memory and IO-space addresses,IRQ lines etc.
712 * Called at initialisation of the PCI subsystem and by CardBus services.
713 * Returns 0 on success and -1 if unknown type of device (not normal, bridge
716 static int pci_setup_device(struct pci_dev * dev)
720 sprintf(pci_name(dev), "%04x:%02x:%02x.%d", pci_domain_nr(dev->bus),
721 dev->bus->number, PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn));
723 pci_read_config_dword(dev, PCI_CLASS_REVISION, &class);
724 dev->revision = class & 0xff;
725 class >>= 8; /* upper 3 bytes */
729 pr_debug("PCI: Found %s [%04x/%04x] %06x %02x\n", pci_name(dev),
730 dev->vendor, dev->device, class, dev->hdr_type);
732 /* "Unknown power state" */
733 dev->current_state = PCI_UNKNOWN;
735 /* Early fixups, before probing the BARs */
736 pci_fixup_device(pci_fixup_early, dev);
737 class = dev->class >> 8;
739 switch (dev->hdr_type) { /* header type */
740 case PCI_HEADER_TYPE_NORMAL: /* standard header */
741 if (class == PCI_CLASS_BRIDGE_PCI)
744 pci_read_bases(dev, 6, PCI_ROM_ADDRESS);
745 pci_read_config_word(dev, PCI_SUBSYSTEM_VENDOR_ID, &dev->subsystem_vendor);
746 pci_read_config_word(dev, PCI_SUBSYSTEM_ID, &dev->subsystem_device);
749 * Do the ugly legacy mode stuff here rather than broken chip
750 * quirk code. Legacy mode ATA controllers have fixed
751 * addresses. These are not always echoed in BAR0-3, and
752 * BAR0-3 in a few cases contain junk!
754 if (class == PCI_CLASS_STORAGE_IDE) {
756 pci_read_config_byte(dev, PCI_CLASS_PROG, &progif);
757 if ((progif & 1) == 0) {
758 dev->resource[0].start = 0x1F0;
759 dev->resource[0].end = 0x1F7;
760 dev->resource[0].flags = LEGACY_IO_RESOURCE;
761 dev->resource[1].start = 0x3F6;
762 dev->resource[1].end = 0x3F6;
763 dev->resource[1].flags = LEGACY_IO_RESOURCE;
765 if ((progif & 4) == 0) {
766 dev->resource[2].start = 0x170;
767 dev->resource[2].end = 0x177;
768 dev->resource[2].flags = LEGACY_IO_RESOURCE;
769 dev->resource[3].start = 0x376;
770 dev->resource[3].end = 0x376;
771 dev->resource[3].flags = LEGACY_IO_RESOURCE;
776 case PCI_HEADER_TYPE_BRIDGE: /* bridge header */
777 if (class != PCI_CLASS_BRIDGE_PCI)
779 /* The PCI-to-PCI bridge spec requires that subtractive
780 decoding (i.e. transparent) bridge must have programming
781 interface code of 0x01. */
783 dev->transparent = ((dev->class & 0xff) == 1);
784 pci_read_bases(dev, 2, PCI_ROM_ADDRESS1);
787 case PCI_HEADER_TYPE_CARDBUS: /* CardBus bridge header */
788 if (class != PCI_CLASS_BRIDGE_CARDBUS)
791 pci_read_bases(dev, 1, 0);
792 pci_read_config_word(dev, PCI_CB_SUBSYSTEM_VENDOR_ID, &dev->subsystem_vendor);
793 pci_read_config_word(dev, PCI_CB_SUBSYSTEM_ID, &dev->subsystem_device);
796 default: /* unknown header */
797 printk(KERN_ERR "PCI: device %s has unknown header type %02x, ignoring.\n",
798 pci_name(dev), dev->hdr_type);
802 printk(KERN_ERR "PCI: %s: class %x doesn't match header type %02x. Ignoring class.\n",
803 pci_name(dev), class, dev->hdr_type);
804 dev->class = PCI_CLASS_NOT_DEFINED;
807 /* We found a fine healthy device, go go go... */
812 * pci_release_dev - free a pci device structure when all users of it are finished.
813 * @dev: device that's been disconnected
815 * Will be called only by the device core when all users of this pci device are
818 static void pci_release_dev(struct device *dev)
820 struct pci_dev *pci_dev;
822 pci_dev = to_pci_dev(dev);
823 pci_vpd_release(pci_dev);
827 static void set_pcie_port_type(struct pci_dev *pdev)
832 pos = pci_find_capability(pdev, PCI_CAP_ID_EXP);
836 pci_read_config_word(pdev, pos + PCI_EXP_FLAGS, ®16);
837 pdev->pcie_type = (reg16 & PCI_EXP_FLAGS_TYPE) >> 4;
841 * pci_cfg_space_size - get the configuration space size of the PCI device.
844 * Regular PCI devices have 256 bytes, but PCI-X 2 and PCI Express devices
845 * have 4096 bytes. Even if the device is capable, that doesn't mean we can
846 * access it. Maybe we don't have a way to generate extended config space
847 * accesses, or the device is behind a reverse Express bridge. So we try
848 * reading the dword at 0x100 which must either be 0 or a valid extended
851 int pci_cfg_space_size_ext(struct pci_dev *dev)
855 if (pci_read_config_dword(dev, 256, &status) != PCIBIOS_SUCCESSFUL)
857 if (status == 0xffffffff)
860 return PCI_CFG_SPACE_EXP_SIZE;
863 return PCI_CFG_SPACE_SIZE;
866 int pci_cfg_space_size(struct pci_dev *dev)
871 pos = pci_find_capability(dev, PCI_CAP_ID_EXP);
873 pos = pci_find_capability(dev, PCI_CAP_ID_PCIX);
877 pci_read_config_dword(dev, pos + PCI_X_STATUS, &status);
878 if (!(status & (PCI_X_STATUS_266MHZ | PCI_X_STATUS_533MHZ)))
882 return pci_cfg_space_size_ext(dev);
885 return PCI_CFG_SPACE_SIZE;
888 static void pci_release_bus_bridge_dev(struct device *dev)
893 struct pci_dev *alloc_pci_dev(void)
897 dev = kzalloc(sizeof(struct pci_dev), GFP_KERNEL);
901 INIT_LIST_HEAD(&dev->bus_list);
903 pci_msi_init_pci_dev(dev);
907 EXPORT_SYMBOL(alloc_pci_dev);
910 * Read the config data for a PCI device, sanity-check it
911 * and fill in the dev structure...
913 static struct pci_dev *pci_scan_device(struct pci_bus *bus, int devfn)
920 if (pci_bus_read_config_dword(bus, devfn, PCI_VENDOR_ID, &l))
923 /* some broken boards return 0 or ~0 if a slot is empty: */
924 if (l == 0xffffffff || l == 0x00000000 ||
925 l == 0x0000ffff || l == 0xffff0000)
928 /* Configuration request Retry Status */
929 while (l == 0xffff0001) {
932 if (pci_bus_read_config_dword(bus, devfn, PCI_VENDOR_ID, &l))
934 /* Card hasn't responded in 60 seconds? Must be stuck. */
935 if (delay > 60 * 1000) {
936 printk(KERN_WARNING "Device %04x:%02x:%02x.%d not "
937 "responding\n", pci_domain_nr(bus),
938 bus->number, PCI_SLOT(devfn),
944 if (pci_bus_read_config_byte(bus, devfn, PCI_HEADER_TYPE, &hdr_type))
947 dev = alloc_pci_dev();
952 dev->sysdata = bus->sysdata;
953 dev->dev.parent = bus->bridge;
954 dev->dev.bus = &pci_bus_type;
956 dev->hdr_type = hdr_type & 0x7f;
957 dev->multifunction = !!(hdr_type & 0x80);
958 dev->vendor = l & 0xffff;
959 dev->device = (l >> 16) & 0xffff;
960 dev->cfg_size = pci_cfg_space_size(dev);
961 dev->error_state = pci_channel_io_normal;
962 set_pcie_port_type(dev);
964 /* Assume 32-bit PCI; let 64-bit PCI cards (which are far rarer)
965 set this higher, assuming the system even supports it. */
966 dev->dma_mask = 0xffffffff;
967 if (pci_setup_device(dev) < 0) {
972 pci_vpd_pci22_init(dev);
977 void pci_device_add(struct pci_dev *dev, struct pci_bus *bus)
979 device_initialize(&dev->dev);
980 dev->dev.release = pci_release_dev;
983 dev->dev.dma_mask = &dev->dma_mask;
984 dev->dev.dma_parms = &dev->dma_parms;
985 dev->dev.coherent_dma_mask = 0xffffffffull;
987 pci_set_dma_max_seg_size(dev, 65536);
988 pci_set_dma_seg_boundary(dev, 0xffffffff);
990 /* Fix up broken headers */
991 pci_fixup_device(pci_fixup_header, dev);
994 * Add the device to our list of discovered devices
995 * and the bus list for fixup functions, etc.
997 down_write(&pci_bus_sem);
998 list_add_tail(&dev->bus_list, &bus->devices);
999 up_write(&pci_bus_sem);
1002 struct pci_dev *__ref pci_scan_single_device(struct pci_bus *bus, int devfn)
1004 struct pci_dev *dev;
1006 dev = pci_scan_device(bus, devfn);
1010 pci_device_add(dev, bus);
1014 EXPORT_SYMBOL(pci_scan_single_device);
1017 * pci_scan_slot - scan a PCI slot on a bus for devices.
1018 * @bus: PCI bus to scan
1019 * @devfn: slot number to scan (must have zero function.)
1021 * Scan a PCI slot on the specified PCI bus for devices, adding
1022 * discovered devices to the @bus->devices list. New devices
1023 * will not have is_added set.
1025 int pci_scan_slot(struct pci_bus *bus, int devfn)
1030 scan_all_fns = pcibios_scan_all_fns(bus, devfn);
1032 for (func = 0; func < 8; func++, devfn++) {
1033 struct pci_dev *dev;
1035 dev = pci_scan_single_device(bus, devfn);
1040 * If this is a single function device,
1041 * don't scan past the first function.
1043 if (!dev->multifunction) {
1045 dev->multifunction = 1;
1051 if (func == 0 && !scan_all_fns)
1057 pcie_aspm_init_link_state(bus->self);
1062 unsigned int __devinit pci_scan_child_bus(struct pci_bus *bus)
1064 unsigned int devfn, pass, max = bus->secondary;
1065 struct pci_dev *dev;
1067 pr_debug("PCI: Scanning bus %04x:%02x\n", pci_domain_nr(bus), bus->number);
1069 /* Go find them, Rover! */
1070 for (devfn = 0; devfn < 0x100; devfn += 8)
1071 pci_scan_slot(bus, devfn);
1074 * After performing arch-dependent fixup of the bus, look behind
1075 * all PCI-to-PCI bridges on this bus.
1077 pr_debug("PCI: Fixups for bus %04x:%02x\n", pci_domain_nr(bus), bus->number);
1078 pcibios_fixup_bus(bus);
1079 for (pass=0; pass < 2; pass++)
1080 list_for_each_entry(dev, &bus->devices, bus_list) {
1081 if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE ||
1082 dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)
1083 max = pci_scan_bridge(bus, dev, max, pass);
1087 * We've scanned the bus and so we know all about what's on
1088 * the other side of any bridges that may be on this bus plus
1091 * Return how far we've got finding sub-buses.
1093 pr_debug("PCI: Bus scan for %04x:%02x returning with max=%02x\n",
1094 pci_domain_nr(bus), bus->number, max);
1098 void __attribute__((weak)) set_pci_bus_resources_arch_default(struct pci_bus *b)
1102 struct pci_bus * pci_create_bus(struct device *parent,
1103 int bus, struct pci_ops *ops, void *sysdata)
1109 b = pci_alloc_bus();
1113 dev = kmalloc(sizeof(*dev), GFP_KERNEL);
1119 b->sysdata = sysdata;
1122 if (pci_find_bus(pci_domain_nr(b), bus)) {
1123 /* If we already got to this bus through a different bridge, ignore it */
1124 pr_debug("PCI: Bus %04x:%02x already known\n", pci_domain_nr(b), bus);
1128 down_write(&pci_bus_sem);
1129 list_add_tail(&b->node, &pci_root_buses);
1130 up_write(&pci_bus_sem);
1132 memset(dev, 0, sizeof(*dev));
1133 dev->parent = parent;
1134 dev->release = pci_release_bus_bridge_dev;
1135 sprintf(dev->bus_id, "pci%04x:%02x", pci_domain_nr(b), bus);
1136 error = device_register(dev);
1139 b->bridge = get_device(dev);
1142 set_dev_node(b->bridge, pcibus_to_node(b));
1144 b->dev.class = &pcibus_class;
1145 b->dev.parent = b->bridge;
1146 sprintf(b->dev.bus_id, "%04x:%02x", pci_domain_nr(b), bus);
1147 error = device_register(&b->dev);
1149 goto class_dev_reg_err;
1150 error = device_create_file(&b->dev, &dev_attr_cpuaffinity);
1152 goto dev_create_file_err;
1154 /* Create legacy_io and legacy_mem files for this bus */
1155 pci_create_legacy_files(b);
1157 b->number = b->secondary = bus;
1158 b->resource[0] = &ioport_resource;
1159 b->resource[1] = &iomem_resource;
1161 set_pci_bus_resources_arch_default(b);
1165 dev_create_file_err:
1166 device_unregister(&b->dev);
1168 device_unregister(dev);
1170 down_write(&pci_bus_sem);
1172 up_write(&pci_bus_sem);
1179 struct pci_bus * __devinit pci_scan_bus_parented(struct device *parent,
1180 int bus, struct pci_ops *ops, void *sysdata)
1184 b = pci_create_bus(parent, bus, ops, sysdata);
1186 b->subordinate = pci_scan_child_bus(b);
1189 EXPORT_SYMBOL(pci_scan_bus_parented);
1191 #ifdef CONFIG_HOTPLUG
1192 EXPORT_SYMBOL(pci_add_new_bus);
1193 EXPORT_SYMBOL(pci_scan_slot);
1194 EXPORT_SYMBOL(pci_scan_bridge);
1195 EXPORT_SYMBOL_GPL(pci_scan_child_bus);
1198 static int __init pci_sort_bf_cmp(const struct pci_dev *a, const struct pci_dev *b)
1200 if (pci_domain_nr(a->bus) < pci_domain_nr(b->bus)) return -1;
1201 else if (pci_domain_nr(a->bus) > pci_domain_nr(b->bus)) return 1;
1203 if (a->bus->number < b->bus->number) return -1;
1204 else if (a->bus->number > b->bus->number) return 1;
1206 if (a->devfn < b->devfn) return -1;
1207 else if (a->devfn > b->devfn) return 1;
1213 * Yes, this forcably breaks the klist abstraction temporarily. It
1214 * just wants to sort the klist, not change reference counts and
1215 * take/drop locks rapidly in the process. It does all this while
1216 * holding the lock for the list, so objects can't otherwise be
1217 * added/removed while we're swizzling.
1219 static void __init pci_insertion_sort_klist(struct pci_dev *a, struct list_head *list)
1221 struct list_head *pos;
1222 struct klist_node *n;
1226 list_for_each(pos, list) {
1227 n = container_of(pos, struct klist_node, n_node);
1228 dev = container_of(n, struct device, knode_bus);
1229 b = to_pci_dev(dev);
1230 if (pci_sort_bf_cmp(a, b) <= 0) {
1231 list_move_tail(&a->dev.knode_bus.n_node, &b->dev.knode_bus.n_node);
1235 list_move_tail(&a->dev.knode_bus.n_node, list);
1238 void __init pci_sort_breadthfirst(void)
1240 LIST_HEAD(sorted_devices);
1241 struct list_head *pos, *tmp;
1242 struct klist_node *n;
1244 struct pci_dev *pdev;
1245 struct klist *device_klist;
1247 device_klist = bus_get_device_klist(&pci_bus_type);
1249 spin_lock(&device_klist->k_lock);
1250 list_for_each_safe(pos, tmp, &device_klist->k_list) {
1251 n = container_of(pos, struct klist_node, n_node);
1252 dev = container_of(n, struct device, knode_bus);
1253 pdev = to_pci_dev(dev);
1254 pci_insertion_sort_klist(pdev, &sorted_devices);
1256 list_splice(&sorted_devices, &device_klist->k_list);
1257 spin_unlock(&device_klist->k_lock);