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 = kmalloc(sizeof(struct bin_attribute) * 2,
39 memset(b->legacy_io, 0, sizeof(struct bin_attribute) * 2);
40 b->legacy_io->attr.name = "legacy_io";
41 b->legacy_io->size = 0xffff;
42 b->legacy_io->attr.mode = S_IRUSR | S_IWUSR;
43 b->legacy_io->attr.owner = THIS_MODULE;
44 b->legacy_io->read = pci_read_legacy_io;
45 b->legacy_io->write = pci_write_legacy_io;
46 class_device_create_bin_file(&b->class_dev, b->legacy_io);
48 /* Allocated above after the legacy_io struct */
49 b->legacy_mem = b->legacy_io + 1;
50 b->legacy_mem->attr.name = "legacy_mem";
51 b->legacy_mem->size = 1024*1024;
52 b->legacy_mem->attr.mode = S_IRUSR | S_IWUSR;
53 b->legacy_mem->attr.owner = THIS_MODULE;
54 b->legacy_mem->mmap = pci_mmap_legacy_mem;
55 class_device_create_bin_file(&b->class_dev, b->legacy_mem);
59 void pci_remove_legacy_files(struct pci_bus *b)
62 class_device_remove_bin_file(&b->class_dev, b->legacy_io);
63 class_device_remove_bin_file(&b->class_dev, b->legacy_mem);
64 kfree(b->legacy_io); /* both are allocated here */
67 #else /* !HAVE_PCI_LEGACY */
68 static inline void pci_create_legacy_files(struct pci_bus *bus) { return; }
69 void pci_remove_legacy_files(struct pci_bus *bus) { return; }
70 #endif /* HAVE_PCI_LEGACY */
73 * PCI Bus Class Devices
75 static ssize_t pci_bus_show_cpuaffinity(struct class_device *class_dev, char *buf)
77 cpumask_t cpumask = pcibus_to_cpumask(to_pci_bus(class_dev));
80 ret = cpumask_scnprintf(buf, PAGE_SIZE, cpumask);
85 CLASS_DEVICE_ATTR(cpuaffinity, S_IRUGO, pci_bus_show_cpuaffinity, NULL);
90 static void release_pcibus_dev(struct class_device *class_dev)
92 struct pci_bus *pci_bus = to_pci_bus(class_dev);
95 put_device(pci_bus->bridge);
99 static struct class pcibus_class = {
101 .release = &release_pcibus_dev,
104 static int __init pcibus_class_init(void)
106 return class_register(&pcibus_class);
108 postcore_initcall(pcibus_class_init);
111 * Translate the low bits of the PCI base
112 * to the resource type
114 static inline unsigned int pci_calc_resource_flags(unsigned int flags)
116 if (flags & PCI_BASE_ADDRESS_SPACE_IO)
117 return IORESOURCE_IO;
119 if (flags & PCI_BASE_ADDRESS_MEM_PREFETCH)
120 return IORESOURCE_MEM | IORESOURCE_PREFETCH;
122 return IORESOURCE_MEM;
126 * Find the extent of a PCI decode..
128 static u32 pci_size(u32 base, u32 maxbase, u32 mask)
130 u32 size = mask & maxbase; /* Find the significant bits */
134 /* Get the lowest of them to find the decode size, and
135 from that the extent. */
136 size = (size & ~(size-1)) - 1;
138 /* base == maxbase can be valid only if the BAR has
139 already been programmed with all 1s. */
140 if (base == maxbase && ((base | size) & mask) != mask)
146 static void pci_read_bases(struct pci_dev *dev, unsigned int howmany, int rom)
148 unsigned int pos, reg, next;
150 struct resource *res;
152 for(pos=0; pos<howmany; pos = next) {
154 res = &dev->resource[pos];
155 res->name = pci_name(dev);
156 reg = PCI_BASE_ADDRESS_0 + (pos << 2);
157 pci_read_config_dword(dev, reg, &l);
158 pci_write_config_dword(dev, reg, ~0);
159 pci_read_config_dword(dev, reg, &sz);
160 pci_write_config_dword(dev, reg, l);
161 if (!sz || sz == 0xffffffff)
165 if ((l & PCI_BASE_ADDRESS_SPACE) == PCI_BASE_ADDRESS_SPACE_MEMORY) {
166 sz = pci_size(l, sz, PCI_BASE_ADDRESS_MEM_MASK);
169 res->start = l & PCI_BASE_ADDRESS_MEM_MASK;
170 res->flags |= l & ~PCI_BASE_ADDRESS_MEM_MASK;
172 sz = pci_size(l, sz, PCI_BASE_ADDRESS_IO_MASK & 0xffff);
175 res->start = l & PCI_BASE_ADDRESS_IO_MASK;
176 res->flags |= l & ~PCI_BASE_ADDRESS_IO_MASK;
178 res->end = res->start + (unsigned long) sz;
179 res->flags |= pci_calc_resource_flags(l);
180 if ((l & (PCI_BASE_ADDRESS_SPACE | PCI_BASE_ADDRESS_MEM_TYPE_MASK))
181 == (PCI_BASE_ADDRESS_SPACE_MEMORY | PCI_BASE_ADDRESS_MEM_TYPE_64)) {
182 pci_read_config_dword(dev, reg+4, &l);
184 #if BITS_PER_LONG == 64
185 res->start |= ((unsigned long) l) << 32;
186 res->end = res->start + sz;
187 pci_write_config_dword(dev, reg+4, ~0);
188 pci_read_config_dword(dev, reg+4, &sz);
189 pci_write_config_dword(dev, reg+4, l);
190 sz = pci_size(l, sz, 0xffffffff);
192 /* This BAR needs > 4GB? Wow. */
193 res->end |= (unsigned long)sz<<32;
197 printk(KERN_ERR "PCI: Unable to handle 64-bit address for device %s\n", pci_name(dev));
206 dev->rom_base_reg = rom;
207 res = &dev->resource[PCI_ROM_RESOURCE];
208 res->name = pci_name(dev);
209 pci_read_config_dword(dev, rom, &l);
210 pci_write_config_dword(dev, rom, ~PCI_ROM_ADDRESS_ENABLE);
211 pci_read_config_dword(dev, rom, &sz);
212 pci_write_config_dword(dev, rom, l);
215 if (sz && sz != 0xffffffff) {
216 sz = pci_size(l, sz, PCI_ROM_ADDRESS_MASK);
218 res->flags = (l & IORESOURCE_ROM_ENABLE) |
219 IORESOURCE_MEM | IORESOURCE_PREFETCH |
220 IORESOURCE_READONLY | IORESOURCE_CACHEABLE;
221 res->start = l & PCI_ROM_ADDRESS_MASK;
222 res->end = res->start + (unsigned long) sz;
228 void __devinit pci_read_bridge_bases(struct pci_bus *child)
230 struct pci_dev *dev = child->self;
231 u8 io_base_lo, io_limit_lo;
232 u16 mem_base_lo, mem_limit_lo;
233 unsigned long base, limit;
234 struct resource *res;
237 if (!dev) /* It's a host bus, nothing to read */
240 if (dev->transparent) {
241 printk(KERN_INFO "PCI: Transparent bridge - %s\n", pci_name(dev));
242 for(i = 0; i < PCI_BUS_NUM_RESOURCES; i++)
243 child->resource[i] = child->parent->resource[i];
248 child->resource[i] = &dev->resource[PCI_BRIDGE_RESOURCES+i];
250 res = child->resource[0];
251 pci_read_config_byte(dev, PCI_IO_BASE, &io_base_lo);
252 pci_read_config_byte(dev, PCI_IO_LIMIT, &io_limit_lo);
253 base = (io_base_lo & PCI_IO_RANGE_MASK) << 8;
254 limit = (io_limit_lo & PCI_IO_RANGE_MASK) << 8;
256 if ((io_base_lo & PCI_IO_RANGE_TYPE_MASK) == PCI_IO_RANGE_TYPE_32) {
257 u16 io_base_hi, io_limit_hi;
258 pci_read_config_word(dev, PCI_IO_BASE_UPPER16, &io_base_hi);
259 pci_read_config_word(dev, PCI_IO_LIMIT_UPPER16, &io_limit_hi);
260 base |= (io_base_hi << 16);
261 limit |= (io_limit_hi << 16);
265 res->flags = (io_base_lo & PCI_IO_RANGE_TYPE_MASK) | IORESOURCE_IO;
267 res->end = limit + 0xfff;
270 res = child->resource[1];
271 pci_read_config_word(dev, PCI_MEMORY_BASE, &mem_base_lo);
272 pci_read_config_word(dev, PCI_MEMORY_LIMIT, &mem_limit_lo);
273 base = (mem_base_lo & PCI_MEMORY_RANGE_MASK) << 16;
274 limit = (mem_limit_lo & PCI_MEMORY_RANGE_MASK) << 16;
276 res->flags = (mem_base_lo & PCI_MEMORY_RANGE_TYPE_MASK) | IORESOURCE_MEM;
278 res->end = limit + 0xfffff;
281 res = child->resource[2];
282 pci_read_config_word(dev, PCI_PREF_MEMORY_BASE, &mem_base_lo);
283 pci_read_config_word(dev, PCI_PREF_MEMORY_LIMIT, &mem_limit_lo);
284 base = (mem_base_lo & PCI_PREF_RANGE_MASK) << 16;
285 limit = (mem_limit_lo & PCI_PREF_RANGE_MASK) << 16;
287 if ((mem_base_lo & PCI_PREF_RANGE_TYPE_MASK) == PCI_PREF_RANGE_TYPE_64) {
288 u32 mem_base_hi, mem_limit_hi;
289 pci_read_config_dword(dev, PCI_PREF_BASE_UPPER32, &mem_base_hi);
290 pci_read_config_dword(dev, PCI_PREF_LIMIT_UPPER32, &mem_limit_hi);
293 * Some bridges set the base > limit by default, and some
294 * (broken) BIOSes do not initialize them. If we find
295 * this, just assume they are not being used.
297 if (mem_base_hi <= mem_limit_hi) {
298 #if BITS_PER_LONG == 64
299 base |= ((long) mem_base_hi) << 32;
300 limit |= ((long) mem_limit_hi) << 32;
302 if (mem_base_hi || mem_limit_hi) {
303 printk(KERN_ERR "PCI: Unable to handle 64-bit address space for bridge %s\n", pci_name(dev));
310 res->flags = (mem_base_lo & PCI_MEMORY_RANGE_TYPE_MASK) | IORESOURCE_MEM | IORESOURCE_PREFETCH;
312 res->end = limit + 0xfffff;
316 static struct pci_bus * __devinit pci_alloc_bus(void)
320 b = kmalloc(sizeof(*b), GFP_KERNEL);
322 memset(b, 0, sizeof(*b));
323 INIT_LIST_HEAD(&b->node);
324 INIT_LIST_HEAD(&b->children);
325 INIT_LIST_HEAD(&b->devices);
330 static struct pci_bus * __devinit
331 pci_alloc_child_bus(struct pci_bus *parent, struct pci_dev *bridge, int busnr)
333 struct pci_bus *child;
337 * Allocate a new bus, and inherit stuff from the parent..
339 child = pci_alloc_bus();
343 child->self = bridge;
344 child->parent = parent;
345 child->ops = parent->ops;
346 child->sysdata = parent->sysdata;
347 child->bridge = get_device(&bridge->dev);
349 child->class_dev.class = &pcibus_class;
350 sprintf(child->class_dev.class_id, "%04x:%02x", pci_domain_nr(child), busnr);
351 class_device_register(&child->class_dev);
352 class_device_create_file(&child->class_dev, &class_device_attr_cpuaffinity);
355 * Set up the primary, secondary and subordinate
358 child->number = child->secondary = busnr;
359 child->primary = parent->secondary;
360 child->subordinate = 0xff;
362 /* Set up default resource pointers and names.. */
363 for (i = 0; i < 4; i++) {
364 child->resource[i] = &bridge->resource[PCI_BRIDGE_RESOURCES+i];
365 child->resource[i]->name = child->name;
367 bridge->subordinate = child;
372 struct pci_bus * __devinit pci_add_new_bus(struct pci_bus *parent, struct pci_dev *dev, int busnr)
374 struct pci_bus *child;
376 child = pci_alloc_child_bus(parent, dev, busnr);
378 spin_lock(&pci_bus_lock);
379 list_add_tail(&child->node, &parent->children);
380 spin_unlock(&pci_bus_lock);
385 static void pci_enable_crs(struct pci_dev *dev)
388 int rpcap = pci_find_capability(dev, PCI_CAP_ID_EXP);
392 pci_read_config_word(dev, rpcap + PCI_CAP_FLAGS, &cap);
393 if (((cap & PCI_EXP_FLAGS_TYPE) >> 4) != PCI_EXP_TYPE_ROOT_PORT)
396 pci_read_config_word(dev, rpcap + PCI_EXP_RTCTL, &rpctl);
397 rpctl |= PCI_EXP_RTCTL_CRSSVE;
398 pci_write_config_word(dev, rpcap + PCI_EXP_RTCTL, rpctl);
401 unsigned int __devinit pci_scan_child_bus(struct pci_bus *bus);
404 * If it's a bridge, configure it and scan the bus behind it.
405 * For CardBus bridges, we don't scan behind as the devices will
406 * be handled by the bridge driver itself.
408 * We need to process bridges in two passes -- first we scan those
409 * already configured by the BIOS and after we are done with all of
410 * them, we proceed to assigning numbers to the remaining buses in
411 * order to avoid overlaps between old and new bus numbers.
413 int __devinit pci_scan_bridge(struct pci_bus *bus, struct pci_dev * dev, int max, int pass)
415 struct pci_bus *child;
416 int is_cardbus = (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS);
420 pci_read_config_dword(dev, PCI_PRIMARY_BUS, &buses);
422 pr_debug("PCI: Scanning behind PCI bridge %s, config %06x, pass %d\n",
423 pci_name(dev), buses & 0xffffff, pass);
425 /* Disable MasterAbortMode during probing to avoid reporting
426 of bus errors (in some architectures) */
427 pci_read_config_word(dev, PCI_BRIDGE_CONTROL, &bctl);
428 pci_write_config_word(dev, PCI_BRIDGE_CONTROL,
429 bctl & ~PCI_BRIDGE_CTL_MASTER_ABORT);
433 if ((buses & 0xffff00) && !pcibios_assign_all_busses() && !is_cardbus) {
434 unsigned int cmax, busnr;
436 * Bus already configured by firmware, process it in the first
437 * pass and just note the configuration.
441 busnr = (buses >> 8) & 0xFF;
444 * If we already got to this bus through a different bridge,
445 * ignore it. This can happen with the i450NX chipset.
447 if (pci_find_bus(pci_domain_nr(bus), busnr)) {
448 printk(KERN_INFO "PCI: Bus %04x:%02x already known\n",
449 pci_domain_nr(bus), busnr);
453 child = pci_add_new_bus(bus, dev, busnr);
456 child->primary = buses & 0xFF;
457 child->subordinate = (buses >> 16) & 0xFF;
458 child->bridge_ctl = bctl;
460 cmax = pci_scan_child_bus(child);
463 if (child->subordinate > max)
464 max = child->subordinate;
467 * We need to assign a number to this bus which we always
468 * do in the second pass.
474 pci_write_config_word(dev, PCI_STATUS, 0xffff);
476 /* Prevent assigning a bus number that already exists.
477 * This can happen when a bridge is hot-plugged */
478 if (pci_find_bus(pci_domain_nr(bus), max+1))
480 child = pci_add_new_bus(bus, dev, ++max);
481 buses = (buses & 0xff000000)
482 | ((unsigned int)(child->primary) << 0)
483 | ((unsigned int)(child->secondary) << 8)
484 | ((unsigned int)(child->subordinate) << 16);
487 * yenta.c forces a secondary latency timer of 176.
488 * Copy that behaviour here.
491 buses &= ~0xff000000;
492 buses |= CARDBUS_LATENCY_TIMER << 24;
496 * We need to blast all three values with a single write.
498 pci_write_config_dword(dev, PCI_PRIMARY_BUS, buses);
501 child->bridge_ctl = PCI_BRIDGE_CTL_NO_ISA;
503 /* Now we can scan all subordinate buses... */
504 max = pci_scan_child_bus(child);
507 * For CardBus bridges, we leave 4 bus numbers
508 * as cards with a PCI-to-PCI bridge can be
511 for (i=0; i<CARDBUS_RESERVE_BUSNR; i++)
512 if (pci_find_bus(pci_domain_nr(bus),
518 * Set the subordinate bus number to its real value.
520 child->subordinate = max;
521 pci_write_config_byte(dev, PCI_SUBORDINATE_BUS, max);
524 pci_write_config_word(dev, PCI_BRIDGE_CONTROL, bctl);
526 sprintf(child->name, (is_cardbus ? "PCI CardBus #%02x" : "PCI Bus #%02x"), child->number);
532 * Read interrupt line and base address registers.
533 * The architecture-dependent code can tweak these, of course.
535 static void pci_read_irq(struct pci_dev *dev)
539 pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &irq);
541 pci_read_config_byte(dev, PCI_INTERRUPT_LINE, &irq);
546 * pci_setup_device - fill in class and map information of a device
547 * @dev: the device structure to fill
549 * Initialize the device structure with information about the device's
550 * vendor,class,memory and IO-space addresses,IRQ lines etc.
551 * Called at initialisation of the PCI subsystem and by CardBus services.
552 * Returns 0 on success and -1 if unknown type of device (not normal, bridge
555 static int pci_setup_device(struct pci_dev * dev)
559 sprintf(pci_name(dev), "%04x:%02x:%02x.%d", pci_domain_nr(dev->bus),
560 dev->bus->number, PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn));
562 pci_read_config_dword(dev, PCI_CLASS_REVISION, &class);
563 class >>= 8; /* upper 3 bytes */
567 pr_debug("PCI: Found %s [%04x/%04x] %06x %02x\n", pci_name(dev),
568 dev->vendor, dev->device, class, dev->hdr_type);
570 /* "Unknown power state" */
571 dev->current_state = 4;
573 /* Early fixups, before probing the BARs */
574 pci_fixup_device(pci_fixup_early, dev);
575 class = dev->class >> 8;
577 switch (dev->hdr_type) { /* header type */
578 case PCI_HEADER_TYPE_NORMAL: /* standard header */
579 if (class == PCI_CLASS_BRIDGE_PCI)
582 pci_read_bases(dev, 6, PCI_ROM_ADDRESS);
583 pci_read_config_word(dev, PCI_SUBSYSTEM_VENDOR_ID, &dev->subsystem_vendor);
584 pci_read_config_word(dev, PCI_SUBSYSTEM_ID, &dev->subsystem_device);
587 case PCI_HEADER_TYPE_BRIDGE: /* bridge header */
588 if (class != PCI_CLASS_BRIDGE_PCI)
590 /* The PCI-to-PCI bridge spec requires that subtractive
591 decoding (i.e. transparent) bridge must have programming
592 interface code of 0x01. */
593 dev->transparent = ((dev->class & 0xff) == 1);
594 pci_read_bases(dev, 2, PCI_ROM_ADDRESS1);
597 case PCI_HEADER_TYPE_CARDBUS: /* CardBus bridge header */
598 if (class != PCI_CLASS_BRIDGE_CARDBUS)
601 pci_read_bases(dev, 1, 0);
602 pci_read_config_word(dev, PCI_CB_SUBSYSTEM_VENDOR_ID, &dev->subsystem_vendor);
603 pci_read_config_word(dev, PCI_CB_SUBSYSTEM_ID, &dev->subsystem_device);
606 default: /* unknown header */
607 printk(KERN_ERR "PCI: device %s has unknown header type %02x, ignoring.\n",
608 pci_name(dev), dev->hdr_type);
612 printk(KERN_ERR "PCI: %s: class %x doesn't match header type %02x. Ignoring class.\n",
613 pci_name(dev), class, dev->hdr_type);
614 dev->class = PCI_CLASS_NOT_DEFINED;
617 /* We found a fine healthy device, go go go... */
622 * pci_release_dev - free a pci device structure when all users of it are finished.
623 * @dev: device that's been disconnected
625 * Will be called only by the device core when all users of this pci device are
628 static void pci_release_dev(struct device *dev)
630 struct pci_dev *pci_dev;
632 pci_dev = to_pci_dev(dev);
637 * pci_cfg_space_size - get the configuration space size of the PCI device.
639 * Regular PCI devices have 256 bytes, but PCI-X 2 and PCI Express devices
640 * have 4096 bytes. Even if the device is capable, that doesn't mean we can
641 * access it. Maybe we don't have a way to generate extended config space
642 * accesses, or the device is behind a reverse Express bridge. So we try
643 * reading the dword at 0x100 which must either be 0 or a valid extended
646 static int pci_cfg_space_size(struct pci_dev *dev)
651 pos = pci_find_capability(dev, PCI_CAP_ID_EXP);
653 pos = pci_find_capability(dev, PCI_CAP_ID_PCIX);
657 pci_read_config_dword(dev, pos + PCI_X_STATUS, &status);
658 if (!(status & (PCI_X_STATUS_266MHZ | PCI_X_STATUS_533MHZ)))
662 if (pci_read_config_dword(dev, 256, &status) != PCIBIOS_SUCCESSFUL)
664 if (status == 0xffffffff)
667 return PCI_CFG_SPACE_EXP_SIZE;
670 return PCI_CFG_SPACE_SIZE;
673 static void pci_release_bus_bridge_dev(struct device *dev)
679 * Read the config data for a PCI device, sanity-check it
680 * and fill in the dev structure...
682 static struct pci_dev * __devinit
683 pci_scan_device(struct pci_bus *bus, int devfn)
690 if (pci_bus_read_config_dword(bus, devfn, PCI_VENDOR_ID, &l))
693 /* some broken boards return 0 or ~0 if a slot is empty: */
694 if (l == 0xffffffff || l == 0x00000000 ||
695 l == 0x0000ffff || l == 0xffff0000)
698 /* Configuration request Retry Status */
699 while (l == 0xffff0001) {
702 if (pci_bus_read_config_dword(bus, devfn, PCI_VENDOR_ID, &l))
704 /* Card hasn't responded in 60 seconds? Must be stuck. */
705 if (delay > 60 * 1000) {
706 printk(KERN_WARNING "Device %04x:%02x:%02x.%d not "
707 "responding\n", pci_domain_nr(bus),
708 bus->number, PCI_SLOT(devfn),
714 if (pci_bus_read_config_byte(bus, devfn, PCI_HEADER_TYPE, &hdr_type))
717 dev = kmalloc(sizeof(struct pci_dev), GFP_KERNEL);
721 memset(dev, 0, sizeof(struct pci_dev));
723 dev->sysdata = bus->sysdata;
724 dev->dev.parent = bus->bridge;
725 dev->dev.bus = &pci_bus_type;
727 dev->hdr_type = hdr_type & 0x7f;
728 dev->multifunction = !!(hdr_type & 0x80);
729 dev->vendor = l & 0xffff;
730 dev->device = (l >> 16) & 0xffff;
731 dev->cfg_size = pci_cfg_space_size(dev);
733 /* Assume 32-bit PCI; let 64-bit PCI cards (which are far rarer)
734 set this higher, assuming the system even supports it. */
735 dev->dma_mask = 0xffffffff;
736 if (pci_setup_device(dev) < 0) {
740 device_initialize(&dev->dev);
741 dev->dev.release = pci_release_dev;
744 pci_name_device(dev);
746 dev->dev.dma_mask = &dev->dma_mask;
747 dev->dev.coherent_dma_mask = 0xffffffffull;
752 struct pci_dev * __devinit
753 pci_scan_single_device(struct pci_bus *bus, int devfn)
757 dev = pci_scan_device(bus, devfn);
758 pci_scan_msi_device(dev);
763 /* Fix up broken headers */
764 pci_fixup_device(pci_fixup_header, dev);
767 * Add the device to our list of discovered devices
768 * and the bus list for fixup functions, etc.
770 INIT_LIST_HEAD(&dev->global_list);
771 spin_lock(&pci_bus_lock);
772 list_add_tail(&dev->bus_list, &bus->devices);
773 spin_unlock(&pci_bus_lock);
779 * pci_scan_slot - scan a PCI slot on a bus for devices.
780 * @bus: PCI bus to scan
781 * @devfn: slot number to scan (must have zero function.)
783 * Scan a PCI slot on the specified PCI bus for devices, adding
784 * discovered devices to the @bus->devices list. New devices
785 * will have an empty dev->global_list head.
787 int __devinit pci_scan_slot(struct pci_bus *bus, int devfn)
792 scan_all_fns = pcibios_scan_all_fns(bus, devfn);
794 for (func = 0; func < 8; func++, devfn++) {
797 dev = pci_scan_single_device(bus, devfn);
802 * If this is a single function device,
803 * don't scan past the first function.
805 if (!dev->multifunction) {
807 dev->multifunction = 1;
813 if (func == 0 && !scan_all_fns)
820 unsigned int __devinit pci_scan_child_bus(struct pci_bus *bus)
822 unsigned int devfn, pass, max = bus->secondary;
825 pr_debug("PCI: Scanning bus %04x:%02x\n", pci_domain_nr(bus), bus->number);
827 /* Go find them, Rover! */
828 for (devfn = 0; devfn < 0x100; devfn += 8)
829 pci_scan_slot(bus, devfn);
832 * After performing arch-dependent fixup of the bus, look behind
833 * all PCI-to-PCI bridges on this bus.
835 pr_debug("PCI: Fixups for bus %04x:%02x\n", pci_domain_nr(bus), bus->number);
836 pcibios_fixup_bus(bus);
837 for (pass=0; pass < 2; pass++)
838 list_for_each_entry(dev, &bus->devices, bus_list) {
839 if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE ||
840 dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)
841 max = pci_scan_bridge(bus, dev, max, pass);
845 * We've scanned the bus and so we know all about what's on
846 * the other side of any bridges that may be on this bus plus
849 * Return how far we've got finding sub-buses.
851 pr_debug("PCI: Bus scan for %04x:%02x returning with max=%02x\n",
852 pci_domain_nr(bus), bus->number, max);
856 unsigned int __devinit pci_do_scan_bus(struct pci_bus *bus)
860 max = pci_scan_child_bus(bus);
863 * Make the discovered devices available.
865 pci_bus_add_devices(bus);
870 struct pci_bus * __devinit pci_scan_bus_parented(struct device *parent, int bus, struct pci_ops *ops, void *sysdata)
880 dev = kmalloc(sizeof(*dev), GFP_KERNEL);
886 b->sysdata = sysdata;
889 if (pci_find_bus(pci_domain_nr(b), bus)) {
890 /* If we already got to this bus through a different bridge, ignore it */
891 pr_debug("PCI: Bus %04x:%02x already known\n", pci_domain_nr(b), bus);
894 spin_lock(&pci_bus_lock);
895 list_add_tail(&b->node, &pci_root_buses);
896 spin_unlock(&pci_bus_lock);
898 memset(dev, 0, sizeof(*dev));
899 dev->parent = parent;
900 dev->release = pci_release_bus_bridge_dev;
901 sprintf(dev->bus_id, "pci%04x:%02x", pci_domain_nr(b), bus);
902 error = device_register(dev);
905 b->bridge = get_device(dev);
907 b->class_dev.class = &pcibus_class;
908 sprintf(b->class_dev.class_id, "%04x:%02x", pci_domain_nr(b), bus);
909 error = class_device_register(&b->class_dev);
911 goto class_dev_reg_err;
912 error = class_device_create_file(&b->class_dev, &class_device_attr_cpuaffinity);
914 goto class_dev_create_file_err;
916 /* Create legacy_io and legacy_mem files for this bus */
917 pci_create_legacy_files(b);
919 error = sysfs_create_link(&b->class_dev.kobj, &b->bridge->kobj, "bridge");
921 goto sys_create_link_err;
923 b->number = b->secondary = bus;
924 b->resource[0] = &ioport_resource;
925 b->resource[1] = &iomem_resource;
927 b->subordinate = pci_scan_child_bus(b);
932 class_device_remove_file(&b->class_dev, &class_device_attr_cpuaffinity);
933 class_dev_create_file_err:
934 class_device_unregister(&b->class_dev);
936 device_unregister(dev);
938 spin_lock(&pci_bus_lock);
940 spin_unlock(&pci_bus_lock);
946 EXPORT_SYMBOL(pci_scan_bus_parented);
948 #ifdef CONFIG_HOTPLUG
949 EXPORT_SYMBOL(pci_add_new_bus);
950 EXPORT_SYMBOL(pci_do_scan_bus);
951 EXPORT_SYMBOL(pci_scan_slot);
952 EXPORT_SYMBOL(pci_scan_bridge);
953 EXPORT_SYMBOL(pci_scan_single_device);
954 EXPORT_SYMBOL_GPL(pci_scan_child_bus);