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);
25 #ifdef HAVE_PCI_LEGACY
27 * pci_create_legacy_files - create legacy I/O port and memory files
28 * @b: bus to create files under
30 * Some platforms allow access to legacy I/O port and ISA memory space on
31 * a per-bus basis. This routine creates the files and ties them into
32 * their associated read, write and mmap files from pci-sysfs.c
34 static void pci_create_legacy_files(struct pci_bus *b)
36 b->legacy_io = kzalloc(sizeof(struct bin_attribute) * 2,
39 b->legacy_io->attr.name = "legacy_io";
40 b->legacy_io->size = 0xffff;
41 b->legacy_io->attr.mode = S_IRUSR | S_IWUSR;
42 b->legacy_io->attr.owner = THIS_MODULE;
43 b->legacy_io->read = pci_read_legacy_io;
44 b->legacy_io->write = pci_write_legacy_io;
45 class_device_create_bin_file(&b->class_dev, b->legacy_io);
47 /* Allocated above after the legacy_io struct */
48 b->legacy_mem = b->legacy_io + 1;
49 b->legacy_mem->attr.name = "legacy_mem";
50 b->legacy_mem->size = 1024*1024;
51 b->legacy_mem->attr.mode = S_IRUSR | S_IWUSR;
52 b->legacy_mem->attr.owner = THIS_MODULE;
53 b->legacy_mem->mmap = pci_mmap_legacy_mem;
54 class_device_create_bin_file(&b->class_dev, b->legacy_mem);
58 void pci_remove_legacy_files(struct pci_bus *b)
61 class_device_remove_bin_file(&b->class_dev, b->legacy_io);
62 class_device_remove_bin_file(&b->class_dev, b->legacy_mem);
63 kfree(b->legacy_io); /* both are allocated here */
66 #else /* !HAVE_PCI_LEGACY */
67 static inline void pci_create_legacy_files(struct pci_bus *bus) { return; }
68 void pci_remove_legacy_files(struct pci_bus *bus) { return; }
69 #endif /* HAVE_PCI_LEGACY */
72 * PCI Bus Class Devices
74 static ssize_t pci_bus_show_cpuaffinity(struct class_device *class_dev,
80 cpumask = pcibus_to_cpumask(to_pci_bus(class_dev));
81 ret = cpumask_scnprintf(buf, PAGE_SIZE, cpumask);
86 CLASS_DEVICE_ATTR(cpuaffinity, S_IRUGO, pci_bus_show_cpuaffinity, NULL);
91 static void release_pcibus_dev(struct class_device *class_dev)
93 struct pci_bus *pci_bus = to_pci_bus(class_dev);
96 put_device(pci_bus->bridge);
100 static struct class pcibus_class = {
102 .release = &release_pcibus_dev,
105 static int __init pcibus_class_init(void)
107 return class_register(&pcibus_class);
109 postcore_initcall(pcibus_class_init);
112 * Translate the low bits of the PCI base
113 * to the resource type
115 static inline unsigned int pci_calc_resource_flags(unsigned int flags)
117 if (flags & PCI_BASE_ADDRESS_SPACE_IO)
118 return IORESOURCE_IO;
120 if (flags & PCI_BASE_ADDRESS_MEM_PREFETCH)
121 return IORESOURCE_MEM | IORESOURCE_PREFETCH;
123 return IORESOURCE_MEM;
127 * Find the extent of a PCI decode..
129 static u32 pci_size(u32 base, u32 maxbase, u32 mask)
131 u32 size = mask & maxbase; /* Find the significant bits */
135 /* Get the lowest of them to find the decode size, and
136 from that the extent. */
137 size = (size & ~(size-1)) - 1;
139 /* base == maxbase can be valid only if the BAR has
140 already been programmed with all 1s. */
141 if (base == maxbase && ((base | size) & mask) != mask)
147 static u64 pci_size64(u64 base, u64 maxbase, u64 mask)
149 u64 size = mask & maxbase; /* Find the significant bits */
153 /* Get the lowest of them to find the decode size, and
154 from that the extent. */
155 size = (size & ~(size-1)) - 1;
157 /* base == maxbase can be valid only if the BAR has
158 already been programmed with all 1s. */
159 if (base == maxbase && ((base | size) & mask) != mask)
165 static inline int is_64bit_memory(u32 mask)
167 if ((mask & (PCI_BASE_ADDRESS_SPACE|PCI_BASE_ADDRESS_MEM_TYPE_MASK)) ==
168 (PCI_BASE_ADDRESS_SPACE_MEMORY|PCI_BASE_ADDRESS_MEM_TYPE_64))
173 static void pci_read_bases(struct pci_dev *dev, unsigned int howmany, int rom)
175 unsigned int pos, reg, next;
177 struct resource *res;
179 for(pos=0; pos<howmany; pos = next) {
185 res = &dev->resource[pos];
186 res->name = pci_name(dev);
187 reg = PCI_BASE_ADDRESS_0 + (pos << 2);
188 pci_read_config_dword(dev, reg, &l);
189 pci_write_config_dword(dev, reg, ~0);
190 pci_read_config_dword(dev, reg, &sz);
191 pci_write_config_dword(dev, reg, l);
192 if (!sz || sz == 0xffffffff)
197 if ((l & PCI_BASE_ADDRESS_SPACE) ==
198 PCI_BASE_ADDRESS_SPACE_MEMORY) {
199 sz = pci_size(l, sz, (u32)PCI_BASE_ADDRESS_MEM_MASK);
201 * For 64bit prefetchable memory sz could be 0, if the
202 * real size is bigger than 4G, so we need to check
205 if (!is_64bit_memory(l) && !sz)
207 res->start = l & PCI_BASE_ADDRESS_MEM_MASK;
208 res->flags |= l & ~PCI_BASE_ADDRESS_MEM_MASK;
210 sz = pci_size(l, sz, PCI_BASE_ADDRESS_IO_MASK & 0xffff);
213 res->start = l & PCI_BASE_ADDRESS_IO_MASK;
214 res->flags |= l & ~PCI_BASE_ADDRESS_IO_MASK;
216 res->end = res->start + (unsigned long) sz;
217 res->flags |= pci_calc_resource_flags(l);
218 if (is_64bit_memory(l)) {
221 pci_read_config_dword(dev, reg+4, &lhi);
222 pci_write_config_dword(dev, reg+4, ~0);
223 pci_read_config_dword(dev, reg+4, &szhi);
224 pci_write_config_dword(dev, reg+4, lhi);
225 sz64 = ((u64)szhi << 32) | raw_sz;
226 l64 = ((u64)lhi << 32) | l;
227 sz64 = pci_size64(l64, sz64, PCI_BASE_ADDRESS_MEM_MASK);
229 #if BITS_PER_LONG == 64
236 res->start = l64 & PCI_BASE_ADDRESS_MEM_MASK;
237 res->end = res->start + sz64;
239 if (sz64 > 0x100000000ULL) {
240 printk(KERN_ERR "PCI: Unable to handle 64-bit "
241 "BAR for device %s\n", pci_name(dev));
245 /* 64-bit wide address, treat as disabled */
246 pci_write_config_dword(dev, reg,
247 l & ~(u32)PCI_BASE_ADDRESS_MEM_MASK);
248 pci_write_config_dword(dev, reg+4, 0);
256 dev->rom_base_reg = rom;
257 res = &dev->resource[PCI_ROM_RESOURCE];
258 res->name = pci_name(dev);
259 pci_read_config_dword(dev, rom, &l);
260 pci_write_config_dword(dev, rom, ~PCI_ROM_ADDRESS_ENABLE);
261 pci_read_config_dword(dev, rom, &sz);
262 pci_write_config_dword(dev, rom, l);
265 if (sz && sz != 0xffffffff) {
266 sz = pci_size(l, sz, (u32)PCI_ROM_ADDRESS_MASK);
268 res->flags = (l & IORESOURCE_ROM_ENABLE) |
269 IORESOURCE_MEM | IORESOURCE_PREFETCH |
270 IORESOURCE_READONLY | IORESOURCE_CACHEABLE;
271 res->start = l & PCI_ROM_ADDRESS_MASK;
272 res->end = res->start + (unsigned long) sz;
278 void __devinit pci_read_bridge_bases(struct pci_bus *child)
280 struct pci_dev *dev = child->self;
281 u8 io_base_lo, io_limit_lo;
282 u16 mem_base_lo, mem_limit_lo;
283 unsigned long base, limit;
284 struct resource *res;
287 if (!dev) /* It's a host bus, nothing to read */
290 if (dev->transparent) {
291 printk(KERN_INFO "PCI: Transparent bridge - %s\n", pci_name(dev));
292 for(i = 3; i < PCI_BUS_NUM_RESOURCES; i++)
293 child->resource[i] = child->parent->resource[i - 3];
297 child->resource[i] = &dev->resource[PCI_BRIDGE_RESOURCES+i];
299 res = child->resource[0];
300 pci_read_config_byte(dev, PCI_IO_BASE, &io_base_lo);
301 pci_read_config_byte(dev, PCI_IO_LIMIT, &io_limit_lo);
302 base = (io_base_lo & PCI_IO_RANGE_MASK) << 8;
303 limit = (io_limit_lo & PCI_IO_RANGE_MASK) << 8;
305 if ((io_base_lo & PCI_IO_RANGE_TYPE_MASK) == PCI_IO_RANGE_TYPE_32) {
306 u16 io_base_hi, io_limit_hi;
307 pci_read_config_word(dev, PCI_IO_BASE_UPPER16, &io_base_hi);
308 pci_read_config_word(dev, PCI_IO_LIMIT_UPPER16, &io_limit_hi);
309 base |= (io_base_hi << 16);
310 limit |= (io_limit_hi << 16);
314 res->flags = (io_base_lo & PCI_IO_RANGE_TYPE_MASK) | IORESOURCE_IO;
318 res->end = limit + 0xfff;
321 res = child->resource[1];
322 pci_read_config_word(dev, PCI_MEMORY_BASE, &mem_base_lo);
323 pci_read_config_word(dev, PCI_MEMORY_LIMIT, &mem_limit_lo);
324 base = (mem_base_lo & PCI_MEMORY_RANGE_MASK) << 16;
325 limit = (mem_limit_lo & PCI_MEMORY_RANGE_MASK) << 16;
327 res->flags = (mem_base_lo & PCI_MEMORY_RANGE_TYPE_MASK) | IORESOURCE_MEM;
329 res->end = limit + 0xfffff;
332 res = child->resource[2];
333 pci_read_config_word(dev, PCI_PREF_MEMORY_BASE, &mem_base_lo);
334 pci_read_config_word(dev, PCI_PREF_MEMORY_LIMIT, &mem_limit_lo);
335 base = (mem_base_lo & PCI_PREF_RANGE_MASK) << 16;
336 limit = (mem_limit_lo & PCI_PREF_RANGE_MASK) << 16;
338 if ((mem_base_lo & PCI_PREF_RANGE_TYPE_MASK) == PCI_PREF_RANGE_TYPE_64) {
339 u32 mem_base_hi, mem_limit_hi;
340 pci_read_config_dword(dev, PCI_PREF_BASE_UPPER32, &mem_base_hi);
341 pci_read_config_dword(dev, PCI_PREF_LIMIT_UPPER32, &mem_limit_hi);
344 * Some bridges set the base > limit by default, and some
345 * (broken) BIOSes do not initialize them. If we find
346 * this, just assume they are not being used.
348 if (mem_base_hi <= mem_limit_hi) {
349 #if BITS_PER_LONG == 64
350 base |= ((long) mem_base_hi) << 32;
351 limit |= ((long) mem_limit_hi) << 32;
353 if (mem_base_hi || mem_limit_hi) {
354 printk(KERN_ERR "PCI: Unable to handle 64-bit address space for bridge %s\n", pci_name(dev));
361 res->flags = (mem_base_lo & PCI_MEMORY_RANGE_TYPE_MASK) | IORESOURCE_MEM | IORESOURCE_PREFETCH;
363 res->end = limit + 0xfffff;
367 static struct pci_bus * pci_alloc_bus(void)
371 b = kzalloc(sizeof(*b), GFP_KERNEL);
373 INIT_LIST_HEAD(&b->node);
374 INIT_LIST_HEAD(&b->children);
375 INIT_LIST_HEAD(&b->devices);
380 static struct pci_bus * __devinit
381 pci_alloc_child_bus(struct pci_bus *parent, struct pci_dev *bridge, int busnr)
383 struct pci_bus *child;
388 * Allocate a new bus, and inherit stuff from the parent..
390 child = pci_alloc_bus();
394 child->self = bridge;
395 child->parent = parent;
396 child->ops = parent->ops;
397 child->sysdata = parent->sysdata;
398 child->bus_flags = parent->bus_flags;
399 child->bridge = get_device(&bridge->dev);
401 child->class_dev.class = &pcibus_class;
402 sprintf(child->class_dev.class_id, "%04x:%02x", pci_domain_nr(child), busnr);
403 retval = class_device_register(&child->class_dev);
406 retval = class_device_create_file(&child->class_dev,
407 &class_device_attr_cpuaffinity);
409 goto error_file_create;
412 * Set up the primary, secondary and subordinate
415 child->number = child->secondary = busnr;
416 child->primary = parent->secondary;
417 child->subordinate = 0xff;
419 /* Set up default resource pointers and names.. */
420 for (i = 0; i < 4; i++) {
421 child->resource[i] = &bridge->resource[PCI_BRIDGE_RESOURCES+i];
422 child->resource[i]->name = child->name;
424 bridge->subordinate = child;
429 class_device_unregister(&child->class_dev);
435 struct pci_bus *pci_add_new_bus(struct pci_bus *parent, struct pci_dev *dev, int busnr)
437 struct pci_bus *child;
439 child = pci_alloc_child_bus(parent, dev, busnr);
441 down_write(&pci_bus_sem);
442 list_add_tail(&child->node, &parent->children);
443 up_write(&pci_bus_sem);
448 static void pci_enable_crs(struct pci_dev *dev)
451 int rpcap = pci_find_capability(dev, PCI_CAP_ID_EXP);
455 pci_read_config_word(dev, rpcap + PCI_CAP_FLAGS, &cap);
456 if (((cap & PCI_EXP_FLAGS_TYPE) >> 4) != PCI_EXP_TYPE_ROOT_PORT)
459 pci_read_config_word(dev, rpcap + PCI_EXP_RTCTL, &rpctl);
460 rpctl |= PCI_EXP_RTCTL_CRSSVE;
461 pci_write_config_word(dev, rpcap + PCI_EXP_RTCTL, rpctl);
464 static void pci_fixup_parent_subordinate_busnr(struct pci_bus *child, int max)
466 struct pci_bus *parent = child->parent;
468 /* Attempts to fix that up are really dangerous unless
469 we're going to re-assign all bus numbers. */
470 if (!pcibios_assign_all_busses())
473 while (parent->parent && parent->subordinate < max) {
474 parent->subordinate = max;
475 pci_write_config_byte(parent->self, PCI_SUBORDINATE_BUS, max);
476 parent = parent->parent;
480 unsigned int pci_scan_child_bus(struct pci_bus *bus);
483 * If it's a bridge, configure it and scan the bus behind it.
484 * For CardBus bridges, we don't scan behind as the devices will
485 * be handled by the bridge driver itself.
487 * We need to process bridges in two passes -- first we scan those
488 * already configured by the BIOS and after we are done with all of
489 * them, we proceed to assigning numbers to the remaining buses in
490 * order to avoid overlaps between old and new bus numbers.
492 int pci_scan_bridge(struct pci_bus *bus, struct pci_dev * dev, int max, int pass)
494 struct pci_bus *child;
495 int is_cardbus = (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS);
499 pci_read_config_dword(dev, PCI_PRIMARY_BUS, &buses);
501 pr_debug("PCI: Scanning behind PCI bridge %s, config %06x, pass %d\n",
502 pci_name(dev), buses & 0xffffff, pass);
504 /* Disable MasterAbortMode during probing to avoid reporting
505 of bus errors (in some architectures) */
506 pci_read_config_word(dev, PCI_BRIDGE_CONTROL, &bctl);
507 pci_write_config_word(dev, PCI_BRIDGE_CONTROL,
508 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 | PCI_BRIDGE_CTL_NO_ISA;
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 while (bus->parent) {
647 if ((child->subordinate > bus->subordinate) ||
648 (child->number > bus->subordinate) ||
649 (child->number < bus->number) ||
650 (child->subordinate < bus->number)) {
651 printk(KERN_WARNING "PCI: Bus #%02x (-#%02x) is "
652 "hidden behind%s bridge #%02x (-#%02x)%s\n",
653 child->number, child->subordinate,
654 bus->self->transparent ? " transparent" : " ",
655 bus->number, bus->subordinate,
656 pcibios_assign_all_busses() ? " " :
657 " (try 'pci=assign-busses')");
658 printk(KERN_WARNING "Please report the result to "
659 "linux-kernel to fix this permanently\n");
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 class >>= 8; /* upper 3 bytes */
709 pr_debug("PCI: Found %s [%04x/%04x] %06x %02x\n", pci_name(dev),
710 dev->vendor, dev->device, class, dev->hdr_type);
712 /* "Unknown power state" */
713 dev->current_state = PCI_UNKNOWN;
715 /* Early fixups, before probing the BARs */
716 pci_fixup_device(pci_fixup_early, dev);
717 class = dev->class >> 8;
719 switch (dev->hdr_type) { /* header type */
720 case PCI_HEADER_TYPE_NORMAL: /* standard header */
721 if (class == PCI_CLASS_BRIDGE_PCI)
724 pci_read_bases(dev, 6, PCI_ROM_ADDRESS);
725 pci_read_config_word(dev, PCI_SUBSYSTEM_VENDOR_ID, &dev->subsystem_vendor);
726 pci_read_config_word(dev, PCI_SUBSYSTEM_ID, &dev->subsystem_device);
729 * Do the ugly legacy mode stuff here rather than broken chip
730 * quirk code. Legacy mode ATA controllers have fixed
731 * addresses. These are not always echoed in BAR0-3, and
732 * BAR0-3 in a few cases contain junk!
734 if (class == PCI_CLASS_STORAGE_IDE) {
736 pci_read_config_byte(dev, PCI_CLASS_PROG, &progif);
737 if ((progif & 1) == 0) {
738 dev->resource[0].start = 0x1F0;
739 dev->resource[0].end = 0x1F7;
740 dev->resource[0].flags = LEGACY_IO_RESOURCE;
741 dev->resource[1].start = 0x3F6;
742 dev->resource[1].end = 0x3F6;
743 dev->resource[1].flags = LEGACY_IO_RESOURCE;
745 if ((progif & 4) == 0) {
746 dev->resource[2].start = 0x170;
747 dev->resource[2].end = 0x177;
748 dev->resource[2].flags = LEGACY_IO_RESOURCE;
749 dev->resource[3].start = 0x376;
750 dev->resource[3].end = 0x376;
751 dev->resource[3].flags = LEGACY_IO_RESOURCE;
756 case PCI_HEADER_TYPE_BRIDGE: /* bridge header */
757 if (class != PCI_CLASS_BRIDGE_PCI)
759 /* The PCI-to-PCI bridge spec requires that subtractive
760 decoding (i.e. transparent) bridge must have programming
761 interface code of 0x01. */
763 dev->transparent = ((dev->class & 0xff) == 1);
764 pci_read_bases(dev, 2, PCI_ROM_ADDRESS1);
767 case PCI_HEADER_TYPE_CARDBUS: /* CardBus bridge header */
768 if (class != PCI_CLASS_BRIDGE_CARDBUS)
771 pci_read_bases(dev, 1, 0);
772 pci_read_config_word(dev, PCI_CB_SUBSYSTEM_VENDOR_ID, &dev->subsystem_vendor);
773 pci_read_config_word(dev, PCI_CB_SUBSYSTEM_ID, &dev->subsystem_device);
776 default: /* unknown header */
777 printk(KERN_ERR "PCI: device %s has unknown header type %02x, ignoring.\n",
778 pci_name(dev), dev->hdr_type);
782 printk(KERN_ERR "PCI: %s: class %x doesn't match header type %02x. Ignoring class.\n",
783 pci_name(dev), class, dev->hdr_type);
784 dev->class = PCI_CLASS_NOT_DEFINED;
787 /* We found a fine healthy device, go go go... */
792 * pci_release_dev - free a pci device structure when all users of it are finished.
793 * @dev: device that's been disconnected
795 * Will be called only by the device core when all users of this pci device are
798 static void pci_release_dev(struct device *dev)
800 struct pci_dev *pci_dev;
802 pci_dev = to_pci_dev(dev);
807 * pci_cfg_space_size - get the configuration space size of the PCI device.
810 * Regular PCI devices have 256 bytes, but PCI-X 2 and PCI Express devices
811 * have 4096 bytes. Even if the device is capable, that doesn't mean we can
812 * access it. Maybe we don't have a way to generate extended config space
813 * accesses, or the device is behind a reverse Express bridge. So we try
814 * reading the dword at 0x100 which must either be 0 or a valid extended
817 int pci_cfg_space_size(struct pci_dev *dev)
822 pos = pci_find_capability(dev, PCI_CAP_ID_EXP);
824 pos = pci_find_capability(dev, PCI_CAP_ID_PCIX);
828 pci_read_config_dword(dev, pos + PCI_X_STATUS, &status);
829 if (!(status & (PCI_X_STATUS_266MHZ | PCI_X_STATUS_533MHZ)))
833 if (pci_read_config_dword(dev, 256, &status) != PCIBIOS_SUCCESSFUL)
835 if (status == 0xffffffff)
838 return PCI_CFG_SPACE_EXP_SIZE;
841 return PCI_CFG_SPACE_SIZE;
844 static void pci_release_bus_bridge_dev(struct device *dev)
849 struct pci_dev *alloc_pci_dev(void)
853 dev = kzalloc(sizeof(struct pci_dev), GFP_KERNEL);
857 INIT_LIST_HEAD(&dev->global_list);
858 INIT_LIST_HEAD(&dev->bus_list);
860 pci_msi_init_pci_dev(dev);
864 EXPORT_SYMBOL(alloc_pci_dev);
867 * Read the config data for a PCI device, sanity-check it
868 * and fill in the dev structure...
870 static struct pci_dev * __devinit
871 pci_scan_device(struct pci_bus *bus, int devfn)
878 if (pci_bus_read_config_dword(bus, devfn, PCI_VENDOR_ID, &l))
881 /* some broken boards return 0 or ~0 if a slot is empty: */
882 if (l == 0xffffffff || l == 0x00000000 ||
883 l == 0x0000ffff || l == 0xffff0000)
886 /* Configuration request Retry Status */
887 while (l == 0xffff0001) {
890 if (pci_bus_read_config_dword(bus, devfn, PCI_VENDOR_ID, &l))
892 /* Card hasn't responded in 60 seconds? Must be stuck. */
893 if (delay > 60 * 1000) {
894 printk(KERN_WARNING "Device %04x:%02x:%02x.%d not "
895 "responding\n", pci_domain_nr(bus),
896 bus->number, PCI_SLOT(devfn),
902 if (pci_bus_read_config_byte(bus, devfn, PCI_HEADER_TYPE, &hdr_type))
905 dev = alloc_pci_dev();
910 dev->sysdata = bus->sysdata;
911 dev->dev.parent = bus->bridge;
912 dev->dev.bus = &pci_bus_type;
914 dev->hdr_type = hdr_type & 0x7f;
915 dev->multifunction = !!(hdr_type & 0x80);
916 dev->vendor = l & 0xffff;
917 dev->device = (l >> 16) & 0xffff;
918 dev->cfg_size = pci_cfg_space_size(dev);
919 dev->error_state = pci_channel_io_normal;
921 /* Assume 32-bit PCI; let 64-bit PCI cards (which are far rarer)
922 set this higher, assuming the system even supports it. */
923 dev->dma_mask = 0xffffffff;
924 if (pci_setup_device(dev) < 0) {
932 void pci_device_add(struct pci_dev *dev, struct pci_bus *bus)
934 device_initialize(&dev->dev);
935 dev->dev.release = pci_release_dev;
938 set_dev_node(&dev->dev, pcibus_to_node(bus));
939 dev->dev.dma_mask = &dev->dma_mask;
940 dev->dev.coherent_dma_mask = 0xffffffffull;
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 *pci_scan_single_device(struct pci_bus *bus, int devfn)
959 dev = pci_scan_device(bus, devfn);
963 pci_device_add(dev, bus);
969 * pci_scan_slot - scan a PCI slot on a bus for devices.
970 * @bus: PCI bus to scan
971 * @devfn: slot number to scan (must have zero function.)
973 * Scan a PCI slot on the specified PCI bus for devices, adding
974 * discovered devices to the @bus->devices list. New devices
975 * will have an empty dev->global_list head.
977 int pci_scan_slot(struct pci_bus *bus, int devfn)
982 scan_all_fns = pcibios_scan_all_fns(bus, devfn);
984 for (func = 0; func < 8; func++, devfn++) {
987 dev = pci_scan_single_device(bus, devfn);
992 * If this is a single function device,
993 * don't scan past the first function.
995 if (!dev->multifunction) {
997 dev->multifunction = 1;
1003 if (func == 0 && !scan_all_fns)
1010 unsigned int pci_scan_child_bus(struct pci_bus *bus)
1012 unsigned int devfn, pass, max = bus->secondary;
1013 struct pci_dev *dev;
1015 pr_debug("PCI: Scanning bus %04x:%02x\n", pci_domain_nr(bus), bus->number);
1017 /* Go find them, Rover! */
1018 for (devfn = 0; devfn < 0x100; devfn += 8)
1019 pci_scan_slot(bus, devfn);
1022 * After performing arch-dependent fixup of the bus, look behind
1023 * all PCI-to-PCI bridges on this bus.
1025 pr_debug("PCI: Fixups for bus %04x:%02x\n", pci_domain_nr(bus), bus->number);
1026 pcibios_fixup_bus(bus);
1027 for (pass=0; pass < 2; pass++)
1028 list_for_each_entry(dev, &bus->devices, bus_list) {
1029 if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE ||
1030 dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)
1031 max = pci_scan_bridge(bus, dev, max, pass);
1035 * We've scanned the bus and so we know all about what's on
1036 * the other side of any bridges that may be on this bus plus
1039 * Return how far we've got finding sub-buses.
1041 pr_debug("PCI: Bus scan for %04x:%02x returning with max=%02x\n",
1042 pci_domain_nr(bus), bus->number, max);
1046 unsigned int __devinit pci_do_scan_bus(struct pci_bus *bus)
1050 max = pci_scan_child_bus(bus);
1053 * Make the discovered devices available.
1055 pci_bus_add_devices(bus);
1060 struct pci_bus * pci_create_bus(struct device *parent,
1061 int bus, struct pci_ops *ops, void *sysdata)
1067 b = pci_alloc_bus();
1071 dev = kmalloc(sizeof(*dev), GFP_KERNEL);
1077 b->sysdata = sysdata;
1080 if (pci_find_bus(pci_domain_nr(b), bus)) {
1081 /* If we already got to this bus through a different bridge, ignore it */
1082 pr_debug("PCI: Bus %04x:%02x already known\n", pci_domain_nr(b), bus);
1086 down_write(&pci_bus_sem);
1087 list_add_tail(&b->node, &pci_root_buses);
1088 up_write(&pci_bus_sem);
1090 memset(dev, 0, sizeof(*dev));
1091 dev->parent = parent;
1092 dev->release = pci_release_bus_bridge_dev;
1093 sprintf(dev->bus_id, "pci%04x:%02x", pci_domain_nr(b), bus);
1094 error = device_register(dev);
1097 b->bridge = get_device(dev);
1099 b->class_dev.class = &pcibus_class;
1100 sprintf(b->class_dev.class_id, "%04x:%02x", pci_domain_nr(b), bus);
1101 error = class_device_register(&b->class_dev);
1103 goto class_dev_reg_err;
1104 error = class_device_create_file(&b->class_dev, &class_device_attr_cpuaffinity);
1106 goto class_dev_create_file_err;
1108 /* Create legacy_io and legacy_mem files for this bus */
1109 pci_create_legacy_files(b);
1111 error = sysfs_create_link(&b->class_dev.kobj, &b->bridge->kobj, "bridge");
1113 goto sys_create_link_err;
1115 b->number = b->secondary = bus;
1116 b->resource[0] = &ioport_resource;
1117 b->resource[1] = &iomem_resource;
1121 sys_create_link_err:
1122 class_device_remove_file(&b->class_dev, &class_device_attr_cpuaffinity);
1123 class_dev_create_file_err:
1124 class_device_unregister(&b->class_dev);
1126 device_unregister(dev);
1128 down_write(&pci_bus_sem);
1130 up_write(&pci_bus_sem);
1136 EXPORT_SYMBOL_GPL(pci_create_bus);
1138 struct pci_bus *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_do_scan_bus);
1153 EXPORT_SYMBOL(pci_scan_slot);
1154 EXPORT_SYMBOL(pci_scan_bridge);
1155 EXPORT_SYMBOL(pci_scan_single_device);
1156 EXPORT_SYMBOL_GPL(pci_scan_child_bus);
1159 static int __init pci_sort_bf_cmp(const struct pci_dev *a, const struct pci_dev *b)
1161 if (pci_domain_nr(a->bus) < pci_domain_nr(b->bus)) return -1;
1162 else if (pci_domain_nr(a->bus) > pci_domain_nr(b->bus)) return 1;
1164 if (a->bus->number < b->bus->number) return -1;
1165 else if (a->bus->number > b->bus->number) return 1;
1167 if (a->devfn < b->devfn) return -1;
1168 else if (a->devfn > b->devfn) return 1;
1174 * Yes, this forcably breaks the klist abstraction temporarily. It
1175 * just wants to sort the klist, not change reference counts and
1176 * take/drop locks rapidly in the process. It does all this while
1177 * holding the lock for the list, so objects can't otherwise be
1178 * added/removed while we're swizzling.
1180 static void __init pci_insertion_sort_klist(struct pci_dev *a, struct list_head *list)
1182 struct list_head *pos;
1183 struct klist_node *n;
1187 list_for_each(pos, list) {
1188 n = container_of(pos, struct klist_node, n_node);
1189 dev = container_of(n, struct device, knode_bus);
1190 b = to_pci_dev(dev);
1191 if (pci_sort_bf_cmp(a, b) <= 0) {
1192 list_move_tail(&a->dev.knode_bus.n_node, &b->dev.knode_bus.n_node);
1196 list_move_tail(&a->dev.knode_bus.n_node, list);
1199 static void __init pci_sort_breadthfirst_klist(void)
1201 LIST_HEAD(sorted_devices);
1202 struct list_head *pos, *tmp;
1203 struct klist_node *n;
1205 struct pci_dev *pdev;
1207 spin_lock(&pci_bus_type.klist_devices.k_lock);
1208 list_for_each_safe(pos, tmp, &pci_bus_type.klist_devices.k_list) {
1209 n = container_of(pos, struct klist_node, n_node);
1210 dev = container_of(n, struct device, knode_bus);
1211 pdev = to_pci_dev(dev);
1212 pci_insertion_sort_klist(pdev, &sorted_devices);
1214 list_splice(&sorted_devices, &pci_bus_type.klist_devices.k_list);
1215 spin_unlock(&pci_bus_type.klist_devices.k_lock);
1218 static void __init pci_insertion_sort_devices(struct pci_dev *a, struct list_head *list)
1222 list_for_each_entry(b, list, global_list) {
1223 if (pci_sort_bf_cmp(a, b) <= 0) {
1224 list_move_tail(&a->global_list, &b->global_list);
1228 list_move_tail(&a->global_list, list);
1231 static void __init pci_sort_breadthfirst_devices(void)
1233 LIST_HEAD(sorted_devices);
1234 struct pci_dev *dev, *tmp;
1236 down_write(&pci_bus_sem);
1237 list_for_each_entry_safe(dev, tmp, &pci_devices, global_list) {
1238 pci_insertion_sort_devices(dev, &sorted_devices);
1240 list_splice(&sorted_devices, &pci_devices);
1241 up_write(&pci_bus_sem);
1244 void __init pci_sort_breadthfirst(void)
1246 pci_sort_breadthfirst_devices();
1247 pci_sort_breadthfirst_klist();