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,
81 cpumask = pcibus_to_cpumask(to_pci_bus(class_dev));
82 ret = cpumask_scnprintf(buf, PAGE_SIZE, cpumask);
87 CLASS_DEVICE_ATTR(cpuaffinity, S_IRUGO, pci_bus_show_cpuaffinity, NULL);
92 static void release_pcibus_dev(struct class_device *class_dev)
94 struct pci_bus *pci_bus = to_pci_bus(class_dev);
97 put_device(pci_bus->bridge);
101 static struct class pcibus_class = {
103 .release = &release_pcibus_dev,
106 static int __init pcibus_class_init(void)
108 return class_register(&pcibus_class);
110 postcore_initcall(pcibus_class_init);
113 * Translate the low bits of the PCI base
114 * to the resource type
116 static inline unsigned int pci_calc_resource_flags(unsigned int flags)
118 if (flags & PCI_BASE_ADDRESS_SPACE_IO)
119 return IORESOURCE_IO;
121 if (flags & PCI_BASE_ADDRESS_MEM_PREFETCH)
122 return IORESOURCE_MEM | IORESOURCE_PREFETCH;
124 return IORESOURCE_MEM;
128 * Find the extent of a PCI decode..
130 static u32 pci_size(u32 base, u32 maxbase, u32 mask)
132 u32 size = mask & maxbase; /* Find the significant bits */
136 /* Get the lowest of them to find the decode size, and
137 from that the extent. */
138 size = (size & ~(size-1)) - 1;
140 /* base == maxbase can be valid only if the BAR has
141 already been programmed with all 1s. */
142 if (base == maxbase && ((base | size) & mask) != mask)
148 static void pci_read_bases(struct pci_dev *dev, unsigned int howmany, int rom)
150 unsigned int pos, reg, next;
152 struct resource *res;
154 for(pos=0; pos<howmany; pos = next) {
156 res = &dev->resource[pos];
157 res->name = pci_name(dev);
158 reg = PCI_BASE_ADDRESS_0 + (pos << 2);
159 pci_read_config_dword(dev, reg, &l);
160 pci_write_config_dword(dev, reg, ~0);
161 pci_read_config_dword(dev, reg, &sz);
162 pci_write_config_dword(dev, reg, l);
163 if (!sz || sz == 0xffffffff)
167 if ((l & PCI_BASE_ADDRESS_SPACE) == PCI_BASE_ADDRESS_SPACE_MEMORY) {
168 sz = pci_size(l, sz, PCI_BASE_ADDRESS_MEM_MASK);
171 res->start = l & PCI_BASE_ADDRESS_MEM_MASK;
172 res->flags |= l & ~PCI_BASE_ADDRESS_MEM_MASK;
174 sz = pci_size(l, sz, PCI_BASE_ADDRESS_IO_MASK & 0xffff);
177 res->start = l & PCI_BASE_ADDRESS_IO_MASK;
178 res->flags |= l & ~PCI_BASE_ADDRESS_IO_MASK;
180 res->end = res->start + (unsigned long) sz;
181 res->flags |= pci_calc_resource_flags(l);
182 if ((l & (PCI_BASE_ADDRESS_SPACE | PCI_BASE_ADDRESS_MEM_TYPE_MASK))
183 == (PCI_BASE_ADDRESS_SPACE_MEMORY | PCI_BASE_ADDRESS_MEM_TYPE_64)) {
184 pci_read_config_dword(dev, reg+4, &l);
186 #if BITS_PER_LONG == 64
187 res->start |= ((unsigned long) l) << 32;
188 res->end = res->start + sz;
189 pci_write_config_dword(dev, reg+4, ~0);
190 pci_read_config_dword(dev, reg+4, &sz);
191 pci_write_config_dword(dev, reg+4, l);
192 sz = pci_size(l, sz, 0xffffffff);
194 /* This BAR needs > 4GB? Wow. */
195 res->end |= (unsigned long)sz<<32;
199 printk(KERN_ERR "PCI: Unable to handle 64-bit address for device %s\n", pci_name(dev));
208 dev->rom_base_reg = rom;
209 res = &dev->resource[PCI_ROM_RESOURCE];
210 res->name = pci_name(dev);
211 pci_read_config_dword(dev, rom, &l);
212 pci_write_config_dword(dev, rom, ~PCI_ROM_ADDRESS_ENABLE);
213 pci_read_config_dword(dev, rom, &sz);
214 pci_write_config_dword(dev, rom, l);
217 if (sz && sz != 0xffffffff) {
218 sz = pci_size(l, sz, PCI_ROM_ADDRESS_MASK);
220 res->flags = (l & IORESOURCE_ROM_ENABLE) |
221 IORESOURCE_MEM | IORESOURCE_PREFETCH |
222 IORESOURCE_READONLY | IORESOURCE_CACHEABLE;
223 res->start = l & PCI_ROM_ADDRESS_MASK;
224 res->end = res->start + (unsigned long) sz;
230 void __devinit pci_read_bridge_bases(struct pci_bus *child)
232 struct pci_dev *dev = child->self;
233 u8 io_base_lo, io_limit_lo;
234 u16 mem_base_lo, mem_limit_lo;
235 unsigned long base, limit;
236 struct resource *res;
239 if (!dev) /* It's a host bus, nothing to read */
242 if (dev->transparent) {
243 printk(KERN_INFO "PCI: Transparent bridge - %s\n", pci_name(dev));
244 for(i = 3; i < PCI_BUS_NUM_RESOURCES; i++)
245 child->resource[i] = child->parent->resource[i - 3];
249 child->resource[i] = &dev->resource[PCI_BRIDGE_RESOURCES+i];
251 res = child->resource[0];
252 pci_read_config_byte(dev, PCI_IO_BASE, &io_base_lo);
253 pci_read_config_byte(dev, PCI_IO_LIMIT, &io_limit_lo);
254 base = (io_base_lo & PCI_IO_RANGE_MASK) << 8;
255 limit = (io_limit_lo & PCI_IO_RANGE_MASK) << 8;
257 if ((io_base_lo & PCI_IO_RANGE_TYPE_MASK) == PCI_IO_RANGE_TYPE_32) {
258 u16 io_base_hi, io_limit_hi;
259 pci_read_config_word(dev, PCI_IO_BASE_UPPER16, &io_base_hi);
260 pci_read_config_word(dev, PCI_IO_LIMIT_UPPER16, &io_limit_hi);
261 base |= (io_base_hi << 16);
262 limit |= (io_limit_hi << 16);
266 res->flags = (io_base_lo & PCI_IO_RANGE_TYPE_MASK) | IORESOURCE_IO;
268 res->end = limit + 0xfff;
271 res = child->resource[1];
272 pci_read_config_word(dev, PCI_MEMORY_BASE, &mem_base_lo);
273 pci_read_config_word(dev, PCI_MEMORY_LIMIT, &mem_limit_lo);
274 base = (mem_base_lo & PCI_MEMORY_RANGE_MASK) << 16;
275 limit = (mem_limit_lo & PCI_MEMORY_RANGE_MASK) << 16;
277 res->flags = (mem_base_lo & PCI_MEMORY_RANGE_TYPE_MASK) | IORESOURCE_MEM;
279 res->end = limit + 0xfffff;
282 res = child->resource[2];
283 pci_read_config_word(dev, PCI_PREF_MEMORY_BASE, &mem_base_lo);
284 pci_read_config_word(dev, PCI_PREF_MEMORY_LIMIT, &mem_limit_lo);
285 base = (mem_base_lo & PCI_PREF_RANGE_MASK) << 16;
286 limit = (mem_limit_lo & PCI_PREF_RANGE_MASK) << 16;
288 if ((mem_base_lo & PCI_PREF_RANGE_TYPE_MASK) == PCI_PREF_RANGE_TYPE_64) {
289 u32 mem_base_hi, mem_limit_hi;
290 pci_read_config_dword(dev, PCI_PREF_BASE_UPPER32, &mem_base_hi);
291 pci_read_config_dword(dev, PCI_PREF_LIMIT_UPPER32, &mem_limit_hi);
294 * Some bridges set the base > limit by default, and some
295 * (broken) BIOSes do not initialize them. If we find
296 * this, just assume they are not being used.
298 if (mem_base_hi <= mem_limit_hi) {
299 #if BITS_PER_LONG == 64
300 base |= ((long) mem_base_hi) << 32;
301 limit |= ((long) mem_limit_hi) << 32;
303 if (mem_base_hi || mem_limit_hi) {
304 printk(KERN_ERR "PCI: Unable to handle 64-bit address space for bridge %s\n", pci_name(dev));
311 res->flags = (mem_base_lo & PCI_MEMORY_RANGE_TYPE_MASK) | IORESOURCE_MEM | IORESOURCE_PREFETCH;
313 res->end = limit + 0xfffff;
317 static struct pci_bus * __devinit pci_alloc_bus(void)
321 b = kmalloc(sizeof(*b), GFP_KERNEL);
323 memset(b, 0, sizeof(*b));
324 INIT_LIST_HEAD(&b->node);
325 INIT_LIST_HEAD(&b->children);
326 INIT_LIST_HEAD(&b->devices);
331 static struct pci_bus * __devinit
332 pci_alloc_child_bus(struct pci_bus *parent, struct pci_dev *bridge, int busnr)
334 struct pci_bus *child;
338 * Allocate a new bus, and inherit stuff from the parent..
340 child = pci_alloc_bus();
344 child->self = bridge;
345 child->parent = parent;
346 child->ops = parent->ops;
347 child->sysdata = parent->sysdata;
348 child->bridge = get_device(&bridge->dev);
350 child->class_dev.class = &pcibus_class;
351 sprintf(child->class_dev.class_id, "%04x:%02x", pci_domain_nr(child), busnr);
352 class_device_register(&child->class_dev);
353 class_device_create_file(&child->class_dev, &class_device_attr_cpuaffinity);
356 * Set up the primary, secondary and subordinate
359 child->number = child->secondary = busnr;
360 child->primary = parent->secondary;
361 child->subordinate = 0xff;
363 /* Set up default resource pointers and names.. */
364 for (i = 0; i < 4; i++) {
365 child->resource[i] = &bridge->resource[PCI_BRIDGE_RESOURCES+i];
366 child->resource[i]->name = child->name;
368 bridge->subordinate = child;
373 struct pci_bus * __devinit pci_add_new_bus(struct pci_bus *parent, struct pci_dev *dev, int busnr)
375 struct pci_bus *child;
377 child = pci_alloc_child_bus(parent, dev, busnr);
379 spin_lock(&pci_bus_lock);
380 list_add_tail(&child->node, &parent->children);
381 spin_unlock(&pci_bus_lock);
386 static void pci_enable_crs(struct pci_dev *dev)
389 int rpcap = pci_find_capability(dev, PCI_CAP_ID_EXP);
393 pci_read_config_word(dev, rpcap + PCI_CAP_FLAGS, &cap);
394 if (((cap & PCI_EXP_FLAGS_TYPE) >> 4) != PCI_EXP_TYPE_ROOT_PORT)
397 pci_read_config_word(dev, rpcap + PCI_EXP_RTCTL, &rpctl);
398 rpctl |= PCI_EXP_RTCTL_CRSSVE;
399 pci_write_config_word(dev, rpcap + PCI_EXP_RTCTL, rpctl);
402 static void __devinit pci_fixup_parent_subordinate_busnr(struct pci_bus *child, int max)
404 struct pci_bus *parent = child->parent;
405 while (parent->parent && parent->subordinate < max) {
406 parent->subordinate = max;
407 pci_write_config_byte(parent->self, PCI_SUBORDINATE_BUS, max);
408 parent = parent->parent;
412 unsigned int __devinit pci_scan_child_bus(struct pci_bus *bus);
415 * If it's a bridge, configure it and scan the bus behind it.
416 * For CardBus bridges, we don't scan behind as the devices will
417 * be handled by the bridge driver itself.
419 * We need to process bridges in two passes -- first we scan those
420 * already configured by the BIOS and after we are done with all of
421 * them, we proceed to assigning numbers to the remaining buses in
422 * order to avoid overlaps between old and new bus numbers.
424 int __devinit pci_scan_bridge(struct pci_bus *bus, struct pci_dev * dev, int max, int pass)
426 struct pci_bus *child;
427 int is_cardbus = (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS);
431 pci_read_config_dword(dev, PCI_PRIMARY_BUS, &buses);
433 pr_debug("PCI: Scanning behind PCI bridge %s, config %06x, pass %d\n",
434 pci_name(dev), buses & 0xffffff, pass);
436 /* Disable MasterAbortMode during probing to avoid reporting
437 of bus errors (in some architectures) */
438 pci_read_config_word(dev, PCI_BRIDGE_CONTROL, &bctl);
439 pci_write_config_word(dev, PCI_BRIDGE_CONTROL,
440 bctl & ~PCI_BRIDGE_CTL_MASTER_ABORT);
444 if ((buses & 0xffff00) && !pcibios_assign_all_busses() && !is_cardbus) {
445 unsigned int cmax, busnr;
447 * Bus already configured by firmware, process it in the first
448 * pass and just note the configuration.
452 busnr = (buses >> 8) & 0xFF;
455 * If we already got to this bus through a different bridge,
456 * ignore it. This can happen with the i450NX chipset.
458 if (pci_find_bus(pci_domain_nr(bus), busnr)) {
459 printk(KERN_INFO "PCI: Bus %04x:%02x already known\n",
460 pci_domain_nr(bus), busnr);
464 child = pci_add_new_bus(bus, dev, busnr);
467 child->primary = buses & 0xFF;
468 child->subordinate = (buses >> 16) & 0xFF;
469 child->bridge_ctl = bctl;
471 cmax = pci_scan_child_bus(child);
474 if (child->subordinate > max)
475 max = child->subordinate;
478 * We need to assign a number to this bus which we always
479 * do in the second pass.
485 pci_write_config_word(dev, PCI_STATUS, 0xffff);
487 /* Prevent assigning a bus number that already exists.
488 * This can happen when a bridge is hot-plugged */
489 if (pci_find_bus(pci_domain_nr(bus), max+1))
491 child = pci_add_new_bus(bus, dev, ++max);
492 buses = (buses & 0xff000000)
493 | ((unsigned int)(child->primary) << 0)
494 | ((unsigned int)(child->secondary) << 8)
495 | ((unsigned int)(child->subordinate) << 16);
498 * yenta.c forces a secondary latency timer of 176.
499 * Copy that behaviour here.
502 buses &= ~0xff000000;
503 buses |= CARDBUS_LATENCY_TIMER << 24;
507 * We need to blast all three values with a single write.
509 pci_write_config_dword(dev, PCI_PRIMARY_BUS, buses);
512 child->bridge_ctl = bctl | PCI_BRIDGE_CTL_NO_ISA;
514 * Adjust subordinate busnr in parent buses.
515 * We do this before scanning for children because
516 * some devices may not be detected if the bios
519 pci_fixup_parent_subordinate_busnr(child, max);
520 /* Now we can scan all subordinate buses... */
521 max = pci_scan_child_bus(child);
524 * For CardBus bridges, we leave 4 bus numbers
525 * as cards with a PCI-to-PCI bridge can be
528 for (i=0; i<CARDBUS_RESERVE_BUSNR; i++)
529 if (pci_find_bus(pci_domain_nr(bus),
533 pci_fixup_parent_subordinate_busnr(child, max);
536 * Set the subordinate bus number to its real value.
538 child->subordinate = max;
539 pci_write_config_byte(dev, PCI_SUBORDINATE_BUS, max);
542 pci_write_config_word(dev, PCI_BRIDGE_CONTROL, bctl);
544 sprintf(child->name, (is_cardbus ? "PCI CardBus #%02x" : "PCI Bus #%02x"), child->number);
550 * Read interrupt line and base address registers.
551 * The architecture-dependent code can tweak these, of course.
553 static void pci_read_irq(struct pci_dev *dev)
557 pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &irq);
559 pci_read_config_byte(dev, PCI_INTERRUPT_LINE, &irq);
564 * pci_setup_device - fill in class and map information of a device
565 * @dev: the device structure to fill
567 * Initialize the device structure with information about the device's
568 * vendor,class,memory and IO-space addresses,IRQ lines etc.
569 * Called at initialisation of the PCI subsystem and by CardBus services.
570 * Returns 0 on success and -1 if unknown type of device (not normal, bridge
573 static int pci_setup_device(struct pci_dev * dev)
577 sprintf(pci_name(dev), "%04x:%02x:%02x.%d", pci_domain_nr(dev->bus),
578 dev->bus->number, PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn));
580 pci_read_config_dword(dev, PCI_CLASS_REVISION, &class);
581 class >>= 8; /* upper 3 bytes */
585 pr_debug("PCI: Found %s [%04x/%04x] %06x %02x\n", pci_name(dev),
586 dev->vendor, dev->device, class, dev->hdr_type);
588 /* "Unknown power state" */
589 dev->current_state = PCI_UNKNOWN;
591 /* Early fixups, before probing the BARs */
592 pci_fixup_device(pci_fixup_early, dev);
593 class = dev->class >> 8;
595 switch (dev->hdr_type) { /* header type */
596 case PCI_HEADER_TYPE_NORMAL: /* standard header */
597 if (class == PCI_CLASS_BRIDGE_PCI)
600 pci_read_bases(dev, 6, PCI_ROM_ADDRESS);
601 pci_read_config_word(dev, PCI_SUBSYSTEM_VENDOR_ID, &dev->subsystem_vendor);
602 pci_read_config_word(dev, PCI_SUBSYSTEM_ID, &dev->subsystem_device);
605 case PCI_HEADER_TYPE_BRIDGE: /* bridge header */
606 if (class != PCI_CLASS_BRIDGE_PCI)
608 /* The PCI-to-PCI bridge spec requires that subtractive
609 decoding (i.e. transparent) bridge must have programming
610 interface code of 0x01. */
611 dev->transparent = ((dev->class & 0xff) == 1);
612 pci_read_bases(dev, 2, PCI_ROM_ADDRESS1);
615 case PCI_HEADER_TYPE_CARDBUS: /* CardBus bridge header */
616 if (class != PCI_CLASS_BRIDGE_CARDBUS)
619 pci_read_bases(dev, 1, 0);
620 pci_read_config_word(dev, PCI_CB_SUBSYSTEM_VENDOR_ID, &dev->subsystem_vendor);
621 pci_read_config_word(dev, PCI_CB_SUBSYSTEM_ID, &dev->subsystem_device);
624 default: /* unknown header */
625 printk(KERN_ERR "PCI: device %s has unknown header type %02x, ignoring.\n",
626 pci_name(dev), dev->hdr_type);
630 printk(KERN_ERR "PCI: %s: class %x doesn't match header type %02x. Ignoring class.\n",
631 pci_name(dev), class, dev->hdr_type);
632 dev->class = PCI_CLASS_NOT_DEFINED;
635 /* We found a fine healthy device, go go go... */
640 * pci_release_dev - free a pci device structure when all users of it are finished.
641 * @dev: device that's been disconnected
643 * Will be called only by the device core when all users of this pci device are
646 static void pci_release_dev(struct device *dev)
648 struct pci_dev *pci_dev;
650 pci_dev = to_pci_dev(dev);
655 * pci_cfg_space_size - get the configuration space size of the PCI device.
657 * Regular PCI devices have 256 bytes, but PCI-X 2 and PCI Express devices
658 * have 4096 bytes. Even if the device is capable, that doesn't mean we can
659 * access it. Maybe we don't have a way to generate extended config space
660 * accesses, or the device is behind a reverse Express bridge. So we try
661 * reading the dword at 0x100 which must either be 0 or a valid extended
664 static int pci_cfg_space_size(struct pci_dev *dev)
669 pos = pci_find_capability(dev, PCI_CAP_ID_EXP);
671 pos = pci_find_capability(dev, PCI_CAP_ID_PCIX);
675 pci_read_config_dword(dev, pos + PCI_X_STATUS, &status);
676 if (!(status & (PCI_X_STATUS_266MHZ | PCI_X_STATUS_533MHZ)))
680 if (pci_read_config_dword(dev, 256, &status) != PCIBIOS_SUCCESSFUL)
682 if (status == 0xffffffff)
685 return PCI_CFG_SPACE_EXP_SIZE;
688 return PCI_CFG_SPACE_SIZE;
691 static void pci_release_bus_bridge_dev(struct device *dev)
697 * Read the config data for a PCI device, sanity-check it
698 * and fill in the dev structure...
700 static struct pci_dev * __devinit
701 pci_scan_device(struct pci_bus *bus, int devfn)
708 if (pci_bus_read_config_dword(bus, devfn, PCI_VENDOR_ID, &l))
711 /* some broken boards return 0 or ~0 if a slot is empty: */
712 if (l == 0xffffffff || l == 0x00000000 ||
713 l == 0x0000ffff || l == 0xffff0000)
716 /* Configuration request Retry Status */
717 while (l == 0xffff0001) {
720 if (pci_bus_read_config_dword(bus, devfn, PCI_VENDOR_ID, &l))
722 /* Card hasn't responded in 60 seconds? Must be stuck. */
723 if (delay > 60 * 1000) {
724 printk(KERN_WARNING "Device %04x:%02x:%02x.%d not "
725 "responding\n", pci_domain_nr(bus),
726 bus->number, PCI_SLOT(devfn),
732 if (pci_bus_read_config_byte(bus, devfn, PCI_HEADER_TYPE, &hdr_type))
735 dev = kmalloc(sizeof(struct pci_dev), GFP_KERNEL);
739 memset(dev, 0, sizeof(struct pci_dev));
741 dev->sysdata = bus->sysdata;
742 dev->dev.parent = bus->bridge;
743 dev->dev.bus = &pci_bus_type;
745 dev->hdr_type = hdr_type & 0x7f;
746 dev->multifunction = !!(hdr_type & 0x80);
747 dev->vendor = l & 0xffff;
748 dev->device = (l >> 16) & 0xffff;
749 dev->cfg_size = pci_cfg_space_size(dev);
751 /* Assume 32-bit PCI; let 64-bit PCI cards (which are far rarer)
752 set this higher, assuming the system even supports it. */
753 dev->dma_mask = 0xffffffff;
754 if (pci_setup_device(dev) < 0) {
762 void __devinit pci_device_add(struct pci_dev *dev, struct pci_bus *bus)
764 device_initialize(&dev->dev);
765 dev->dev.release = pci_release_dev;
768 dev->dev.dma_mask = &dev->dma_mask;
769 dev->dev.coherent_dma_mask = 0xffffffffull;
771 /* Fix up broken headers */
772 pci_fixup_device(pci_fixup_header, dev);
775 * Add the device to our list of discovered devices
776 * and the bus list for fixup functions, etc.
778 INIT_LIST_HEAD(&dev->global_list);
779 spin_lock(&pci_bus_lock);
780 list_add_tail(&dev->bus_list, &bus->devices);
781 spin_unlock(&pci_bus_lock);
784 struct pci_dev * __devinit
785 pci_scan_single_device(struct pci_bus *bus, int devfn)
789 dev = pci_scan_device(bus, devfn);
793 pci_device_add(dev, bus);
794 pci_scan_msi_device(dev);
800 * pci_scan_slot - scan a PCI slot on a bus for devices.
801 * @bus: PCI bus to scan
802 * @devfn: slot number to scan (must have zero function.)
804 * Scan a PCI slot on the specified PCI bus for devices, adding
805 * discovered devices to the @bus->devices list. New devices
806 * will have an empty dev->global_list head.
808 int __devinit pci_scan_slot(struct pci_bus *bus, int devfn)
813 scan_all_fns = pcibios_scan_all_fns(bus, devfn);
815 for (func = 0; func < 8; func++, devfn++) {
818 dev = pci_scan_single_device(bus, devfn);
823 * If this is a single function device,
824 * don't scan past the first function.
826 if (!dev->multifunction) {
828 dev->multifunction = 1;
834 if (func == 0 && !scan_all_fns)
841 unsigned int __devinit pci_scan_child_bus(struct pci_bus *bus)
843 unsigned int devfn, pass, max = bus->secondary;
846 pr_debug("PCI: Scanning bus %04x:%02x\n", pci_domain_nr(bus), bus->number);
848 /* Go find them, Rover! */
849 for (devfn = 0; devfn < 0x100; devfn += 8)
850 pci_scan_slot(bus, devfn);
853 * After performing arch-dependent fixup of the bus, look behind
854 * all PCI-to-PCI bridges on this bus.
856 pr_debug("PCI: Fixups for bus %04x:%02x\n", pci_domain_nr(bus), bus->number);
857 pcibios_fixup_bus(bus);
858 for (pass=0; pass < 2; pass++)
859 list_for_each_entry(dev, &bus->devices, bus_list) {
860 if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE ||
861 dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)
862 max = pci_scan_bridge(bus, dev, max, pass);
866 * We've scanned the bus and so we know all about what's on
867 * the other side of any bridges that may be on this bus plus
870 * Return how far we've got finding sub-buses.
872 pr_debug("PCI: Bus scan for %04x:%02x returning with max=%02x\n",
873 pci_domain_nr(bus), bus->number, max);
877 unsigned int __devinit pci_do_scan_bus(struct pci_bus *bus)
881 max = pci_scan_child_bus(bus);
884 * Make the discovered devices available.
886 pci_bus_add_devices(bus);
891 struct pci_bus * __devinit pci_create_bus(struct device *parent,
892 int bus, struct pci_ops *ops, void *sysdata)
902 dev = kmalloc(sizeof(*dev), GFP_KERNEL);
908 b->sysdata = sysdata;
911 if (pci_find_bus(pci_domain_nr(b), bus)) {
912 /* If we already got to this bus through a different bridge, ignore it */
913 pr_debug("PCI: Bus %04x:%02x already known\n", pci_domain_nr(b), bus);
916 spin_lock(&pci_bus_lock);
917 list_add_tail(&b->node, &pci_root_buses);
918 spin_unlock(&pci_bus_lock);
920 memset(dev, 0, sizeof(*dev));
921 dev->parent = parent;
922 dev->release = pci_release_bus_bridge_dev;
923 sprintf(dev->bus_id, "pci%04x:%02x", pci_domain_nr(b), bus);
924 error = device_register(dev);
927 b->bridge = get_device(dev);
929 b->class_dev.class = &pcibus_class;
930 sprintf(b->class_dev.class_id, "%04x:%02x", pci_domain_nr(b), bus);
931 error = class_device_register(&b->class_dev);
933 goto class_dev_reg_err;
934 error = class_device_create_file(&b->class_dev, &class_device_attr_cpuaffinity);
936 goto class_dev_create_file_err;
938 /* Create legacy_io and legacy_mem files for this bus */
939 pci_create_legacy_files(b);
941 error = sysfs_create_link(&b->class_dev.kobj, &b->bridge->kobj, "bridge");
943 goto sys_create_link_err;
945 b->number = b->secondary = bus;
946 b->resource[0] = &ioport_resource;
947 b->resource[1] = &iomem_resource;
952 class_device_remove_file(&b->class_dev, &class_device_attr_cpuaffinity);
953 class_dev_create_file_err:
954 class_device_unregister(&b->class_dev);
956 device_unregister(dev);
958 spin_lock(&pci_bus_lock);
960 spin_unlock(&pci_bus_lock);
966 EXPORT_SYMBOL_GPL(pci_create_bus);
968 struct pci_bus * __devinit pci_scan_bus_parented(struct device *parent,
969 int bus, struct pci_ops *ops, void *sysdata)
973 b = pci_create_bus(parent, bus, ops, sysdata);
975 b->subordinate = pci_scan_child_bus(b);
978 EXPORT_SYMBOL(pci_scan_bus_parented);
980 #ifdef CONFIG_HOTPLUG
981 EXPORT_SYMBOL(pci_add_new_bus);
982 EXPORT_SYMBOL(pci_do_scan_bus);
983 EXPORT_SYMBOL(pci_scan_slot);
984 EXPORT_SYMBOL(pci_scan_bridge);
985 EXPORT_SYMBOL(pci_scan_single_device);
986 EXPORT_SYMBOL_GPL(pci_scan_child_bus);