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, (u32)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, (u32)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;
270 res->end = limit + 0xfff;
273 res = child->resource[1];
274 pci_read_config_word(dev, PCI_MEMORY_BASE, &mem_base_lo);
275 pci_read_config_word(dev, PCI_MEMORY_LIMIT, &mem_limit_lo);
276 base = (mem_base_lo & PCI_MEMORY_RANGE_MASK) << 16;
277 limit = (mem_limit_lo & PCI_MEMORY_RANGE_MASK) << 16;
279 res->flags = (mem_base_lo & PCI_MEMORY_RANGE_TYPE_MASK) | IORESOURCE_MEM;
281 res->end = limit + 0xfffff;
284 res = child->resource[2];
285 pci_read_config_word(dev, PCI_PREF_MEMORY_BASE, &mem_base_lo);
286 pci_read_config_word(dev, PCI_PREF_MEMORY_LIMIT, &mem_limit_lo);
287 base = (mem_base_lo & PCI_PREF_RANGE_MASK) << 16;
288 limit = (mem_limit_lo & PCI_PREF_RANGE_MASK) << 16;
290 if ((mem_base_lo & PCI_PREF_RANGE_TYPE_MASK) == PCI_PREF_RANGE_TYPE_64) {
291 u32 mem_base_hi, mem_limit_hi;
292 pci_read_config_dword(dev, PCI_PREF_BASE_UPPER32, &mem_base_hi);
293 pci_read_config_dword(dev, PCI_PREF_LIMIT_UPPER32, &mem_limit_hi);
296 * Some bridges set the base > limit by default, and some
297 * (broken) BIOSes do not initialize them. If we find
298 * this, just assume they are not being used.
300 if (mem_base_hi <= mem_limit_hi) {
301 #if BITS_PER_LONG == 64
302 base |= ((long) mem_base_hi) << 32;
303 limit |= ((long) mem_limit_hi) << 32;
305 if (mem_base_hi || mem_limit_hi) {
306 printk(KERN_ERR "PCI: Unable to handle 64-bit address space for bridge %s\n", pci_name(dev));
313 res->flags = (mem_base_lo & PCI_MEMORY_RANGE_TYPE_MASK) | IORESOURCE_MEM | IORESOURCE_PREFETCH;
315 res->end = limit + 0xfffff;
319 static struct pci_bus * __devinit pci_alloc_bus(void)
323 b = kmalloc(sizeof(*b), GFP_KERNEL);
325 memset(b, 0, sizeof(*b));
326 INIT_LIST_HEAD(&b->node);
327 INIT_LIST_HEAD(&b->children);
328 INIT_LIST_HEAD(&b->devices);
333 static struct pci_bus * __devinit
334 pci_alloc_child_bus(struct pci_bus *parent, struct pci_dev *bridge, int busnr)
336 struct pci_bus *child;
340 * Allocate a new bus, and inherit stuff from the parent..
342 child = pci_alloc_bus();
346 child->self = bridge;
347 child->parent = parent;
348 child->ops = parent->ops;
349 child->sysdata = parent->sysdata;
350 child->bridge = get_device(&bridge->dev);
352 child->class_dev.class = &pcibus_class;
353 sprintf(child->class_dev.class_id, "%04x:%02x", pci_domain_nr(child), busnr);
354 class_device_register(&child->class_dev);
355 class_device_create_file(&child->class_dev, &class_device_attr_cpuaffinity);
358 * Set up the primary, secondary and subordinate
361 child->number = child->secondary = busnr;
362 child->primary = parent->secondary;
363 child->subordinate = 0xff;
365 /* Set up default resource pointers and names.. */
366 for (i = 0; i < 4; i++) {
367 child->resource[i] = &bridge->resource[PCI_BRIDGE_RESOURCES+i];
368 child->resource[i]->name = child->name;
370 bridge->subordinate = child;
375 struct pci_bus * __devinit pci_add_new_bus(struct pci_bus *parent, struct pci_dev *dev, int busnr)
377 struct pci_bus *child;
379 child = pci_alloc_child_bus(parent, dev, busnr);
381 spin_lock(&pci_bus_lock);
382 list_add_tail(&child->node, &parent->children);
383 spin_unlock(&pci_bus_lock);
388 static void pci_enable_crs(struct pci_dev *dev)
391 int rpcap = pci_find_capability(dev, PCI_CAP_ID_EXP);
395 pci_read_config_word(dev, rpcap + PCI_CAP_FLAGS, &cap);
396 if (((cap & PCI_EXP_FLAGS_TYPE) >> 4) != PCI_EXP_TYPE_ROOT_PORT)
399 pci_read_config_word(dev, rpcap + PCI_EXP_RTCTL, &rpctl);
400 rpctl |= PCI_EXP_RTCTL_CRSSVE;
401 pci_write_config_word(dev, rpcap + PCI_EXP_RTCTL, rpctl);
404 static void __devinit pci_fixup_parent_subordinate_busnr(struct pci_bus *child, int max)
406 struct pci_bus *parent = child->parent;
408 /* Attempts to fix that up are really dangerous unless
409 we're going to re-assign all bus numbers. */
410 if (!pcibios_assign_all_busses())
413 while (parent->parent && parent->subordinate < max) {
414 parent->subordinate = max;
415 pci_write_config_byte(parent->self, PCI_SUBORDINATE_BUS, max);
416 parent = parent->parent;
420 unsigned int __devinit pci_scan_child_bus(struct pci_bus *bus);
423 * If it's a bridge, configure it and scan the bus behind it.
424 * For CardBus bridges, we don't scan behind as the devices will
425 * be handled by the bridge driver itself.
427 * We need to process bridges in two passes -- first we scan those
428 * already configured by the BIOS and after we are done with all of
429 * them, we proceed to assigning numbers to the remaining buses in
430 * order to avoid overlaps between old and new bus numbers.
432 int __devinit pci_scan_bridge(struct pci_bus *bus, struct pci_dev * dev, int max, int pass)
434 struct pci_bus *child;
435 int is_cardbus = (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS);
439 pci_read_config_dword(dev, PCI_PRIMARY_BUS, &buses);
441 pr_debug("PCI: Scanning behind PCI bridge %s, config %06x, pass %d\n",
442 pci_name(dev), buses & 0xffffff, pass);
444 /* Disable MasterAbortMode during probing to avoid reporting
445 of bus errors (in some architectures) */
446 pci_read_config_word(dev, PCI_BRIDGE_CONTROL, &bctl);
447 pci_write_config_word(dev, PCI_BRIDGE_CONTROL,
448 bctl & ~PCI_BRIDGE_CTL_MASTER_ABORT);
452 if ((buses & 0xffff00) && !pcibios_assign_all_busses() && !is_cardbus) {
453 unsigned int cmax, busnr;
455 * Bus already configured by firmware, process it in the first
456 * pass and just note the configuration.
460 busnr = (buses >> 8) & 0xFF;
463 * If we already got to this bus through a different bridge,
464 * ignore it. This can happen with the i450NX chipset.
466 if (pci_find_bus(pci_domain_nr(bus), busnr)) {
467 printk(KERN_INFO "PCI: Bus %04x:%02x already known\n",
468 pci_domain_nr(bus), busnr);
472 child = pci_add_new_bus(bus, dev, busnr);
475 child->primary = buses & 0xFF;
476 child->subordinate = (buses >> 16) & 0xFF;
477 child->bridge_ctl = bctl;
479 cmax = pci_scan_child_bus(child);
482 if (child->subordinate > max)
483 max = child->subordinate;
486 * We need to assign a number to this bus which we always
487 * do in the second pass.
490 if (pcibios_assign_all_busses())
491 /* Temporarily disable forwarding of the
492 configuration cycles on all bridges in
493 this bus segment to avoid possible
494 conflicts in the second pass between two
495 bridges programmed with overlapping
497 pci_write_config_dword(dev, PCI_PRIMARY_BUS,
503 pci_write_config_word(dev, PCI_STATUS, 0xffff);
505 /* Prevent assigning a bus number that already exists.
506 * This can happen when a bridge is hot-plugged */
507 if (pci_find_bus(pci_domain_nr(bus), max+1))
509 child = pci_add_new_bus(bus, dev, ++max);
510 buses = (buses & 0xff000000)
511 | ((unsigned int)(child->primary) << 0)
512 | ((unsigned int)(child->secondary) << 8)
513 | ((unsigned int)(child->subordinate) << 16);
516 * yenta.c forces a secondary latency timer of 176.
517 * Copy that behaviour here.
520 buses &= ~0xff000000;
521 buses |= CARDBUS_LATENCY_TIMER << 24;
525 * We need to blast all three values with a single write.
527 pci_write_config_dword(dev, PCI_PRIMARY_BUS, buses);
530 child->bridge_ctl = bctl | PCI_BRIDGE_CTL_NO_ISA;
532 * Adjust subordinate busnr in parent buses.
533 * We do this before scanning for children because
534 * some devices may not be detected if the bios
537 pci_fixup_parent_subordinate_busnr(child, max);
538 /* Now we can scan all subordinate buses... */
539 max = pci_scan_child_bus(child);
541 * now fix it up again since we have found
542 * the real value of max.
544 pci_fixup_parent_subordinate_busnr(child, max);
547 * For CardBus bridges, we leave 4 bus numbers
548 * as cards with a PCI-to-PCI bridge can be
551 for (i=0; i<CARDBUS_RESERVE_BUSNR; i++) {
552 struct pci_bus *parent = bus;
553 if (pci_find_bus(pci_domain_nr(bus),
556 while (parent->parent) {
557 if ((!pcibios_assign_all_busses()) &&
558 (parent->subordinate > max) &&
559 (parent->subordinate <= max+i)) {
562 parent = parent->parent;
566 * Often, there are two cardbus bridges
567 * -- try to leave one valid bus number
575 pci_fixup_parent_subordinate_busnr(child, max);
578 * Set the subordinate bus number to its real value.
580 child->subordinate = max;
581 pci_write_config_byte(dev, PCI_SUBORDINATE_BUS, max);
584 pci_write_config_word(dev, PCI_BRIDGE_CONTROL, bctl);
586 sprintf(child->name, (is_cardbus ? "PCI CardBus #%02x" : "PCI Bus #%02x"), child->number);
588 while (bus->parent) {
589 if ((child->subordinate > bus->subordinate) ||
590 (child->number > bus->subordinate) ||
591 (child->number < bus->number) ||
592 (child->subordinate < bus->number)) {
593 printk(KERN_WARNING "PCI: Bus #%02x (-#%02x) may be "
594 "hidden behind%s bridge #%02x (-#%02x)%s\n",
595 child->number, child->subordinate,
596 bus->self->transparent ? " transparent" : " ",
597 bus->number, bus->subordinate,
598 pcibios_assign_all_busses() ? " " :
599 " (try 'pci=assign-busses')");
608 * Read interrupt line and base address registers.
609 * The architecture-dependent code can tweak these, of course.
611 static void pci_read_irq(struct pci_dev *dev)
615 pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &irq);
618 pci_read_config_byte(dev, PCI_INTERRUPT_LINE, &irq);
623 * pci_setup_device - fill in class and map information of a device
624 * @dev: the device structure to fill
626 * Initialize the device structure with information about the device's
627 * vendor,class,memory and IO-space addresses,IRQ lines etc.
628 * Called at initialisation of the PCI subsystem and by CardBus services.
629 * Returns 0 on success and -1 if unknown type of device (not normal, bridge
632 static int pci_setup_device(struct pci_dev * dev)
636 sprintf(pci_name(dev), "%04x:%02x:%02x.%d", pci_domain_nr(dev->bus),
637 dev->bus->number, PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn));
639 pci_read_config_dword(dev, PCI_CLASS_REVISION, &class);
640 class >>= 8; /* upper 3 bytes */
644 pr_debug("PCI: Found %s [%04x/%04x] %06x %02x\n", pci_name(dev),
645 dev->vendor, dev->device, class, dev->hdr_type);
647 /* "Unknown power state" */
648 dev->current_state = PCI_UNKNOWN;
650 /* Early fixups, before probing the BARs */
651 pci_fixup_device(pci_fixup_early, dev);
652 class = dev->class >> 8;
654 switch (dev->hdr_type) { /* header type */
655 case PCI_HEADER_TYPE_NORMAL: /* standard header */
656 if (class == PCI_CLASS_BRIDGE_PCI)
659 pci_read_bases(dev, 6, PCI_ROM_ADDRESS);
660 pci_read_config_word(dev, PCI_SUBSYSTEM_VENDOR_ID, &dev->subsystem_vendor);
661 pci_read_config_word(dev, PCI_SUBSYSTEM_ID, &dev->subsystem_device);
664 case PCI_HEADER_TYPE_BRIDGE: /* bridge header */
665 if (class != PCI_CLASS_BRIDGE_PCI)
667 /* The PCI-to-PCI bridge spec requires that subtractive
668 decoding (i.e. transparent) bridge must have programming
669 interface code of 0x01. */
671 dev->transparent = ((dev->class & 0xff) == 1);
672 pci_read_bases(dev, 2, PCI_ROM_ADDRESS1);
675 case PCI_HEADER_TYPE_CARDBUS: /* CardBus bridge header */
676 if (class != PCI_CLASS_BRIDGE_CARDBUS)
679 pci_read_bases(dev, 1, 0);
680 pci_read_config_word(dev, PCI_CB_SUBSYSTEM_VENDOR_ID, &dev->subsystem_vendor);
681 pci_read_config_word(dev, PCI_CB_SUBSYSTEM_ID, &dev->subsystem_device);
684 default: /* unknown header */
685 printk(KERN_ERR "PCI: device %s has unknown header type %02x, ignoring.\n",
686 pci_name(dev), dev->hdr_type);
690 printk(KERN_ERR "PCI: %s: class %x doesn't match header type %02x. Ignoring class.\n",
691 pci_name(dev), class, dev->hdr_type);
692 dev->class = PCI_CLASS_NOT_DEFINED;
695 /* We found a fine healthy device, go go go... */
700 * pci_release_dev - free a pci device structure when all users of it are finished.
701 * @dev: device that's been disconnected
703 * Will be called only by the device core when all users of this pci device are
706 static void pci_release_dev(struct device *dev)
708 struct pci_dev *pci_dev;
710 pci_dev = to_pci_dev(dev);
715 * pci_cfg_space_size - get the configuration space size of the PCI device.
718 * Regular PCI devices have 256 bytes, but PCI-X 2 and PCI Express devices
719 * have 4096 bytes. Even if the device is capable, that doesn't mean we can
720 * access it. Maybe we don't have a way to generate extended config space
721 * accesses, or the device is behind a reverse Express bridge. So we try
722 * reading the dword at 0x100 which must either be 0 or a valid extended
725 int pci_cfg_space_size(struct pci_dev *dev)
730 pos = pci_find_capability(dev, PCI_CAP_ID_EXP);
732 pos = pci_find_capability(dev, PCI_CAP_ID_PCIX);
736 pci_read_config_dword(dev, pos + PCI_X_STATUS, &status);
737 if (!(status & (PCI_X_STATUS_266MHZ | PCI_X_STATUS_533MHZ)))
741 if (pci_read_config_dword(dev, 256, &status) != PCIBIOS_SUCCESSFUL)
743 if (status == 0xffffffff)
746 return PCI_CFG_SPACE_EXP_SIZE;
749 return PCI_CFG_SPACE_SIZE;
752 static void pci_release_bus_bridge_dev(struct device *dev)
758 * Read the config data for a PCI device, sanity-check it
759 * and fill in the dev structure...
761 static struct pci_dev * __devinit
762 pci_scan_device(struct pci_bus *bus, int devfn)
769 if (pci_bus_read_config_dword(bus, devfn, PCI_VENDOR_ID, &l))
772 /* some broken boards return 0 or ~0 if a slot is empty: */
773 if (l == 0xffffffff || l == 0x00000000 ||
774 l == 0x0000ffff || l == 0xffff0000)
777 /* Configuration request Retry Status */
778 while (l == 0xffff0001) {
781 if (pci_bus_read_config_dword(bus, devfn, PCI_VENDOR_ID, &l))
783 /* Card hasn't responded in 60 seconds? Must be stuck. */
784 if (delay > 60 * 1000) {
785 printk(KERN_WARNING "Device %04x:%02x:%02x.%d not "
786 "responding\n", pci_domain_nr(bus),
787 bus->number, PCI_SLOT(devfn),
793 if (pci_bus_read_config_byte(bus, devfn, PCI_HEADER_TYPE, &hdr_type))
796 dev = kmalloc(sizeof(struct pci_dev), GFP_KERNEL);
800 memset(dev, 0, sizeof(struct pci_dev));
802 dev->sysdata = bus->sysdata;
803 dev->dev.parent = bus->bridge;
804 dev->dev.bus = &pci_bus_type;
806 dev->hdr_type = hdr_type & 0x7f;
807 dev->multifunction = !!(hdr_type & 0x80);
808 dev->vendor = l & 0xffff;
809 dev->device = (l >> 16) & 0xffff;
810 dev->cfg_size = pci_cfg_space_size(dev);
812 /* Assume 32-bit PCI; let 64-bit PCI cards (which are far rarer)
813 set this higher, assuming the system even supports it. */
814 dev->dma_mask = 0xffffffff;
815 if (pci_setup_device(dev) < 0) {
823 void __devinit pci_device_add(struct pci_dev *dev, struct pci_bus *bus)
825 device_initialize(&dev->dev);
826 dev->dev.release = pci_release_dev;
829 dev->dev.dma_mask = &dev->dma_mask;
830 dev->dev.coherent_dma_mask = 0xffffffffull;
832 /* Fix up broken headers */
833 pci_fixup_device(pci_fixup_header, dev);
836 * Add the device to our list of discovered devices
837 * and the bus list for fixup functions, etc.
839 INIT_LIST_HEAD(&dev->global_list);
840 spin_lock(&pci_bus_lock);
841 list_add_tail(&dev->bus_list, &bus->devices);
842 spin_unlock(&pci_bus_lock);
845 struct pci_dev * __devinit
846 pci_scan_single_device(struct pci_bus *bus, int devfn)
850 dev = pci_scan_device(bus, devfn);
854 pci_device_add(dev, bus);
855 pci_scan_msi_device(dev);
861 * pci_scan_slot - scan a PCI slot on a bus for devices.
862 * @bus: PCI bus to scan
863 * @devfn: slot number to scan (must have zero function.)
865 * Scan a PCI slot on the specified PCI bus for devices, adding
866 * discovered devices to the @bus->devices list. New devices
867 * will have an empty dev->global_list head.
869 int __devinit pci_scan_slot(struct pci_bus *bus, int devfn)
874 scan_all_fns = pcibios_scan_all_fns(bus, devfn);
876 for (func = 0; func < 8; func++, devfn++) {
879 dev = pci_scan_single_device(bus, devfn);
884 * If this is a single function device,
885 * don't scan past the first function.
887 if (!dev->multifunction) {
889 dev->multifunction = 1;
895 if (func == 0 && !scan_all_fns)
902 unsigned int __devinit pci_scan_child_bus(struct pci_bus *bus)
904 unsigned int devfn, pass, max = bus->secondary;
907 pr_debug("PCI: Scanning bus %04x:%02x\n", pci_domain_nr(bus), bus->number);
909 /* Go find them, Rover! */
910 for (devfn = 0; devfn < 0x100; devfn += 8)
911 pci_scan_slot(bus, devfn);
914 * After performing arch-dependent fixup of the bus, look behind
915 * all PCI-to-PCI bridges on this bus.
917 pr_debug("PCI: Fixups for bus %04x:%02x\n", pci_domain_nr(bus), bus->number);
918 pcibios_fixup_bus(bus);
919 for (pass=0; pass < 2; pass++)
920 list_for_each_entry(dev, &bus->devices, bus_list) {
921 if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE ||
922 dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)
923 max = pci_scan_bridge(bus, dev, max, pass);
927 * We've scanned the bus and so we know all about what's on
928 * the other side of any bridges that may be on this bus plus
931 * Return how far we've got finding sub-buses.
933 pr_debug("PCI: Bus scan for %04x:%02x returning with max=%02x\n",
934 pci_domain_nr(bus), bus->number, max);
938 unsigned int __devinit pci_do_scan_bus(struct pci_bus *bus)
942 max = pci_scan_child_bus(bus);
945 * Make the discovered devices available.
947 pci_bus_add_devices(bus);
952 struct pci_bus * __devinit pci_create_bus(struct device *parent,
953 int bus, struct pci_ops *ops, void *sysdata)
963 dev = kmalloc(sizeof(*dev), GFP_KERNEL);
969 b->sysdata = sysdata;
972 if (pci_find_bus(pci_domain_nr(b), bus)) {
973 /* If we already got to this bus through a different bridge, ignore it */
974 pr_debug("PCI: Bus %04x:%02x already known\n", pci_domain_nr(b), bus);
977 spin_lock(&pci_bus_lock);
978 list_add_tail(&b->node, &pci_root_buses);
979 spin_unlock(&pci_bus_lock);
981 memset(dev, 0, sizeof(*dev));
982 dev->parent = parent;
983 dev->release = pci_release_bus_bridge_dev;
984 sprintf(dev->bus_id, "pci%04x:%02x", pci_domain_nr(b), bus);
985 error = device_register(dev);
988 b->bridge = get_device(dev);
990 b->class_dev.class = &pcibus_class;
991 sprintf(b->class_dev.class_id, "%04x:%02x", pci_domain_nr(b), bus);
992 error = class_device_register(&b->class_dev);
994 goto class_dev_reg_err;
995 error = class_device_create_file(&b->class_dev, &class_device_attr_cpuaffinity);
997 goto class_dev_create_file_err;
999 /* Create legacy_io and legacy_mem files for this bus */
1000 pci_create_legacy_files(b);
1002 error = sysfs_create_link(&b->class_dev.kobj, &b->bridge->kobj, "bridge");
1004 goto sys_create_link_err;
1006 b->number = b->secondary = bus;
1007 b->resource[0] = &ioport_resource;
1008 b->resource[1] = &iomem_resource;
1012 sys_create_link_err:
1013 class_device_remove_file(&b->class_dev, &class_device_attr_cpuaffinity);
1014 class_dev_create_file_err:
1015 class_device_unregister(&b->class_dev);
1017 device_unregister(dev);
1019 spin_lock(&pci_bus_lock);
1021 spin_unlock(&pci_bus_lock);
1027 EXPORT_SYMBOL_GPL(pci_create_bus);
1029 struct pci_bus * __devinit pci_scan_bus_parented(struct device *parent,
1030 int bus, struct pci_ops *ops, void *sysdata)
1034 b = pci_create_bus(parent, bus, ops, sysdata);
1036 b->subordinate = pci_scan_child_bus(b);
1039 EXPORT_SYMBOL(pci_scan_bus_parented);
1041 #ifdef CONFIG_HOTPLUG
1042 EXPORT_SYMBOL(pci_add_new_bus);
1043 EXPORT_SYMBOL(pci_do_scan_bus);
1044 EXPORT_SYMBOL(pci_scan_slot);
1045 EXPORT_SYMBOL(pci_scan_bridge);
1046 EXPORT_SYMBOL(pci_scan_single_device);
1047 EXPORT_SYMBOL_GPL(pci_scan_child_bus);