2 * probe.c - PCI detection and setup code
5 #include <linux/kernel.h>
6 #include <linux/delay.h>
7 #include <linux/init.h>
9 #include <linux/slab.h>
10 #include <linux/module.h>
11 #include <linux/cpumask.h>
12 #include <linux/pci-aspm.h>
15 #define CARDBUS_LATENCY_TIMER 176 /* secondary latency timer */
16 #define CARDBUS_RESERVE_BUSNR 3
17 #define PCI_CFG_SPACE_SIZE 256
18 #define PCI_CFG_SPACE_EXP_SIZE 4096
20 /* Ugh. Need to stop exporting this to modules. */
21 LIST_HEAD(pci_root_buses);
22 EXPORT_SYMBOL(pci_root_buses);
25 static int find_anything(struct device *dev, void *data)
31 * Some device drivers need know if pci is initiated.
32 * Basically, we think pci is not initiated when there
33 * is no device to be found on the pci_bus_type.
35 int no_pci_devices(void)
40 dev = bus_find_device(&pci_bus_type, NULL, NULL, find_anything);
41 no_devices = (dev == NULL);
45 EXPORT_SYMBOL(no_pci_devices);
47 #ifdef HAVE_PCI_LEGACY
49 * pci_create_legacy_files - create legacy I/O port and memory files
50 * @b: bus to create files under
52 * Some platforms allow access to legacy I/O port and ISA memory space on
53 * a per-bus basis. This routine creates the files and ties them into
54 * their associated read, write and mmap files from pci-sysfs.c
56 * On error unwind, but don't propogate the error to the caller
57 * as it is ok to set up the PCI bus without these files.
59 static void pci_create_legacy_files(struct pci_bus *b)
63 b->legacy_io = kzalloc(sizeof(struct bin_attribute) * 2,
68 b->legacy_io->attr.name = "legacy_io";
69 b->legacy_io->size = 0xffff;
70 b->legacy_io->attr.mode = S_IRUSR | S_IWUSR;
71 b->legacy_io->read = pci_read_legacy_io;
72 b->legacy_io->write = pci_write_legacy_io;
73 error = device_create_bin_file(&b->dev, b->legacy_io);
77 /* Allocated above after the legacy_io struct */
78 b->legacy_mem = b->legacy_io + 1;
79 b->legacy_mem->attr.name = "legacy_mem";
80 b->legacy_mem->size = 1024*1024;
81 b->legacy_mem->attr.mode = S_IRUSR | S_IWUSR;
82 b->legacy_mem->mmap = pci_mmap_legacy_mem;
83 error = device_create_bin_file(&b->dev, b->legacy_mem);
90 device_remove_bin_file(&b->dev, b->legacy_io);
95 printk(KERN_WARNING "pci: warning: could not create legacy I/O port "
96 "and ISA memory resources to sysfs\n");
100 void pci_remove_legacy_files(struct pci_bus *b)
103 device_remove_bin_file(&b->dev, b->legacy_io);
104 device_remove_bin_file(&b->dev, b->legacy_mem);
105 kfree(b->legacy_io); /* both are allocated here */
108 #else /* !HAVE_PCI_LEGACY */
109 static inline void pci_create_legacy_files(struct pci_bus *bus) { return; }
110 void pci_remove_legacy_files(struct pci_bus *bus) { return; }
111 #endif /* HAVE_PCI_LEGACY */
114 * PCI Bus Class Devices
116 static ssize_t pci_bus_show_cpuaffinity(struct device *dev,
118 struct device_attribute *attr,
124 cpumask = pcibus_to_cpumask(to_pci_bus(dev));
126 cpulist_scnprintf(buf, PAGE_SIZE-2, cpumask):
127 cpumask_scnprintf(buf, PAGE_SIZE-2, cpumask);
133 static ssize_t inline pci_bus_show_cpumaskaffinity(struct device *dev,
134 struct device_attribute *attr,
137 return pci_bus_show_cpuaffinity(dev, 0, attr, buf);
140 static ssize_t inline pci_bus_show_cpulistaffinity(struct device *dev,
141 struct device_attribute *attr,
144 return pci_bus_show_cpuaffinity(dev, 1, attr, buf);
147 DEVICE_ATTR(cpuaffinity, S_IRUGO, pci_bus_show_cpumaskaffinity, NULL);
148 DEVICE_ATTR(cpulistaffinity, S_IRUGO, pci_bus_show_cpulistaffinity, NULL);
153 static void release_pcibus_dev(struct device *dev)
155 struct pci_bus *pci_bus = to_pci_bus(dev);
158 put_device(pci_bus->bridge);
162 static struct class pcibus_class = {
164 .dev_release = &release_pcibus_dev,
167 static int __init pcibus_class_init(void)
169 return class_register(&pcibus_class);
171 postcore_initcall(pcibus_class_init);
174 * Translate the low bits of the PCI base
175 * to the resource type
177 static inline unsigned int pci_calc_resource_flags(unsigned int flags)
179 if (flags & PCI_BASE_ADDRESS_SPACE_IO)
180 return IORESOURCE_IO;
182 if (flags & PCI_BASE_ADDRESS_MEM_PREFETCH)
183 return IORESOURCE_MEM | IORESOURCE_PREFETCH;
185 return IORESOURCE_MEM;
188 static u64 pci_size(u64 base, u64 maxbase, u64 mask)
190 u64 size = mask & maxbase; /* Find the significant bits */
194 /* Get the lowest of them to find the decode size, and
195 from that the extent. */
196 size = (size & ~(size-1)) - 1;
198 /* base == maxbase can be valid only if the BAR has
199 already been programmed with all 1s. */
200 if (base == maxbase && ((base | size) & mask) != mask)
207 pci_bar_unknown, /* Standard PCI BAR probe */
208 pci_bar_io, /* An io port BAR */
209 pci_bar_mem32, /* A 32-bit memory BAR */
210 pci_bar_mem64, /* A 64-bit memory BAR */
213 static inline enum pci_bar_type decode_bar(struct resource *res, u32 bar)
215 if ((bar & PCI_BASE_ADDRESS_SPACE) == PCI_BASE_ADDRESS_SPACE_IO) {
216 res->flags = bar & ~PCI_BASE_ADDRESS_IO_MASK;
220 res->flags = bar & ~PCI_BASE_ADDRESS_MEM_MASK;
222 if (res->flags == PCI_BASE_ADDRESS_MEM_TYPE_64)
223 return pci_bar_mem64;
224 return pci_bar_mem32;
228 * If the type is not unknown, we assume that the lowest bit is 'enable'.
229 * Returns 1 if the BAR was 64-bit and 0 if it was 32-bit.
231 static int __pci_read_base(struct pci_dev *dev, enum pci_bar_type type,
232 struct resource *res, unsigned int pos)
236 mask = type ? ~PCI_ROM_ADDRESS_ENABLE : ~0;
238 res->name = pci_name(dev);
240 pci_read_config_dword(dev, pos, &l);
241 pci_write_config_dword(dev, pos, mask);
242 pci_read_config_dword(dev, pos, &sz);
243 pci_write_config_dword(dev, pos, l);
246 * All bits set in sz means the device isn't working properly.
247 * If the BAR isn't implemented, all bits must be 0. If it's a
248 * memory BAR or a ROM, bit 0 must be clear; if it's an io BAR, bit
251 if (!sz || sz == 0xffffffff)
255 * I don't know how l can have all bits set. Copied from old code.
256 * Maybe it fixes a bug on some ancient platform.
261 if (type == pci_bar_unknown) {
262 type = decode_bar(res, l);
263 res->flags |= pci_calc_resource_flags(l) | IORESOURCE_SIZEALIGN;
264 if (type == pci_bar_io) {
265 l &= PCI_BASE_ADDRESS_IO_MASK;
266 mask = PCI_BASE_ADDRESS_IO_MASK & 0xffff;
268 l &= PCI_BASE_ADDRESS_MEM_MASK;
269 mask = (u32)PCI_BASE_ADDRESS_MEM_MASK;
272 res->flags |= (l & IORESOURCE_ROM_ENABLE);
273 l &= PCI_ROM_ADDRESS_MASK;
274 mask = (u32)PCI_ROM_ADDRESS_MASK;
277 if (type == pci_bar_mem64) {
280 u64 mask64 = mask | (u64)~0 << 32;
282 pci_read_config_dword(dev, pos + 4, &l);
283 pci_write_config_dword(dev, pos + 4, ~0);
284 pci_read_config_dword(dev, pos + 4, &sz);
285 pci_write_config_dword(dev, pos + 4, l);
287 l64 |= ((u64)l << 32);
288 sz64 |= ((u64)sz << 32);
290 sz64 = pci_size(l64, sz64, mask64);
295 if ((sizeof(resource_size_t) < 8) && (sz64 > 0x100000000ULL)) {
296 dev_err(&dev->dev, "can't handle 64-bit BAR\n");
298 } else if ((sizeof(resource_size_t) < 8) && l) {
299 /* Address above 32-bit boundary; disable the BAR */
300 pci_write_config_dword(dev, pos, 0);
301 pci_write_config_dword(dev, pos + 4, 0);
306 res->end = l64 + sz64;
307 printk(KERN_DEBUG "PCI: %s reg %x 64bit mmio: [%llx, %llx]\n",
308 pci_name(dev), pos, (unsigned long long)res->start,
309 (unsigned long long)res->end);
312 sz = pci_size(l, sz, mask);
319 printk(KERN_DEBUG "PCI: %s reg %x %s: [%llx, %llx]\n", pci_name(dev),
320 pos, (res->flags & IORESOURCE_IO) ? "io port":"32bit mmio",
321 (unsigned long long)res->start, (unsigned long long)res->end);
325 return (type == pci_bar_mem64) ? 1 : 0;
331 static void pci_read_bases(struct pci_dev *dev, unsigned int howmany, int rom)
333 unsigned int pos, reg;
335 for (pos = 0; pos < howmany; pos++) {
336 struct resource *res = &dev->resource[pos];
337 reg = PCI_BASE_ADDRESS_0 + (pos << 2);
338 pos += __pci_read_base(dev, pci_bar_unknown, res, reg);
342 struct resource *res = &dev->resource[PCI_ROM_RESOURCE];
343 dev->rom_base_reg = rom;
344 res->flags = IORESOURCE_MEM | IORESOURCE_PREFETCH |
345 IORESOURCE_READONLY | IORESOURCE_CACHEABLE |
346 IORESOURCE_SIZEALIGN;
347 __pci_read_base(dev, pci_bar_mem32, res, rom);
351 void __devinit pci_read_bridge_bases(struct pci_bus *child)
353 struct pci_dev *dev = child->self;
354 u8 io_base_lo, io_limit_lo;
355 u16 mem_base_lo, mem_limit_lo;
356 unsigned long base, limit;
357 struct resource *res;
360 if (!dev) /* It's a host bus, nothing to read */
363 if (dev->transparent) {
364 dev_info(&dev->dev, "transparent bridge\n");
365 for(i = 3; i < PCI_BUS_NUM_RESOURCES; i++)
366 child->resource[i] = child->parent->resource[i - 3];
370 child->resource[i] = &dev->resource[PCI_BRIDGE_RESOURCES+i];
372 res = child->resource[0];
373 pci_read_config_byte(dev, PCI_IO_BASE, &io_base_lo);
374 pci_read_config_byte(dev, PCI_IO_LIMIT, &io_limit_lo);
375 base = (io_base_lo & PCI_IO_RANGE_MASK) << 8;
376 limit = (io_limit_lo & PCI_IO_RANGE_MASK) << 8;
378 if ((io_base_lo & PCI_IO_RANGE_TYPE_MASK) == PCI_IO_RANGE_TYPE_32) {
379 u16 io_base_hi, io_limit_hi;
380 pci_read_config_word(dev, PCI_IO_BASE_UPPER16, &io_base_hi);
381 pci_read_config_word(dev, PCI_IO_LIMIT_UPPER16, &io_limit_hi);
382 base |= (io_base_hi << 16);
383 limit |= (io_limit_hi << 16);
387 res->flags = (io_base_lo & PCI_IO_RANGE_TYPE_MASK) | IORESOURCE_IO;
391 res->end = limit + 0xfff;
392 printk(KERN_DEBUG "PCI: bridge %s io port: [%llx, %llx]\n",
393 pci_name(dev), (unsigned long long) res->start,
394 (unsigned long long) res->end);
397 res = child->resource[1];
398 pci_read_config_word(dev, PCI_MEMORY_BASE, &mem_base_lo);
399 pci_read_config_word(dev, PCI_MEMORY_LIMIT, &mem_limit_lo);
400 base = (mem_base_lo & PCI_MEMORY_RANGE_MASK) << 16;
401 limit = (mem_limit_lo & PCI_MEMORY_RANGE_MASK) << 16;
403 res->flags = (mem_base_lo & PCI_MEMORY_RANGE_TYPE_MASK) | IORESOURCE_MEM;
405 res->end = limit + 0xfffff;
406 printk(KERN_DEBUG "PCI: bridge %s 32bit mmio: [%llx, %llx]\n",
407 pci_name(dev), (unsigned long long) res->start,
408 (unsigned long long) res->end);
411 res = child->resource[2];
412 pci_read_config_word(dev, PCI_PREF_MEMORY_BASE, &mem_base_lo);
413 pci_read_config_word(dev, PCI_PREF_MEMORY_LIMIT, &mem_limit_lo);
414 base = (mem_base_lo & PCI_PREF_RANGE_MASK) << 16;
415 limit = (mem_limit_lo & PCI_PREF_RANGE_MASK) << 16;
417 if ((mem_base_lo & PCI_PREF_RANGE_TYPE_MASK) == PCI_PREF_RANGE_TYPE_64) {
418 u32 mem_base_hi, mem_limit_hi;
419 pci_read_config_dword(dev, PCI_PREF_BASE_UPPER32, &mem_base_hi);
420 pci_read_config_dword(dev, PCI_PREF_LIMIT_UPPER32, &mem_limit_hi);
423 * Some bridges set the base > limit by default, and some
424 * (broken) BIOSes do not initialize them. If we find
425 * this, just assume they are not being used.
427 if (mem_base_hi <= mem_limit_hi) {
428 #if BITS_PER_LONG == 64
429 base |= ((long) mem_base_hi) << 32;
430 limit |= ((long) mem_limit_hi) << 32;
432 if (mem_base_hi || mem_limit_hi) {
433 dev_err(&dev->dev, "can't handle 64-bit "
434 "address space for bridge\n");
441 res->flags = (mem_base_lo & PCI_MEMORY_RANGE_TYPE_MASK) | IORESOURCE_MEM | IORESOURCE_PREFETCH;
443 res->end = limit + 0xfffff;
444 printk(KERN_DEBUG "PCI: bridge %s %sbit mmio pref: [%llx, %llx]\n",
445 pci_name(dev), (res->flags & PCI_PREF_RANGE_TYPE_64) ? "64" : "32",
446 (unsigned long long) res->start, (unsigned long long) res->end);
450 static struct pci_bus * pci_alloc_bus(void)
454 b = kzalloc(sizeof(*b), GFP_KERNEL);
456 INIT_LIST_HEAD(&b->node);
457 INIT_LIST_HEAD(&b->children);
458 INIT_LIST_HEAD(&b->devices);
459 INIT_LIST_HEAD(&b->slots);
464 static struct pci_bus *pci_alloc_child_bus(struct pci_bus *parent,
465 struct pci_dev *bridge, int busnr)
467 struct pci_bus *child;
471 * Allocate a new bus, and inherit stuff from the parent..
473 child = pci_alloc_bus();
477 child->self = bridge;
478 child->parent = parent;
479 child->ops = parent->ops;
480 child->sysdata = parent->sysdata;
481 child->bus_flags = parent->bus_flags;
482 child->bridge = get_device(&bridge->dev);
484 /* initialize some portions of the bus device, but don't register it
485 * now as the parent is not properly set up yet. This device will get
486 * registered later in pci_bus_add_devices()
488 child->dev.class = &pcibus_class;
489 sprintf(child->dev.bus_id, "%04x:%02x", pci_domain_nr(child), busnr);
492 * Set up the primary, secondary and subordinate
495 child->number = child->secondary = busnr;
496 child->primary = parent->secondary;
497 child->subordinate = 0xff;
499 /* Set up default resource pointers and names.. */
500 for (i = 0; i < 4; i++) {
501 child->resource[i] = &bridge->resource[PCI_BRIDGE_RESOURCES+i];
502 child->resource[i]->name = child->name;
504 bridge->subordinate = child;
509 struct pci_bus *__ref pci_add_new_bus(struct pci_bus *parent, struct pci_dev *dev, int busnr)
511 struct pci_bus *child;
513 child = pci_alloc_child_bus(parent, dev, busnr);
515 down_write(&pci_bus_sem);
516 list_add_tail(&child->node, &parent->children);
517 up_write(&pci_bus_sem);
522 static void pci_fixup_parent_subordinate_busnr(struct pci_bus *child, int max)
524 struct pci_bus *parent = child->parent;
526 /* Attempts to fix that up are really dangerous unless
527 we're going to re-assign all bus numbers. */
528 if (!pcibios_assign_all_busses())
531 while (parent->parent && parent->subordinate < max) {
532 parent->subordinate = max;
533 pci_write_config_byte(parent->self, PCI_SUBORDINATE_BUS, max);
534 parent = parent->parent;
539 * If it's a bridge, configure it and scan the bus behind it.
540 * For CardBus bridges, we don't scan behind as the devices will
541 * be handled by the bridge driver itself.
543 * We need to process bridges in two passes -- first we scan those
544 * already configured by the BIOS and after we are done with all of
545 * them, we proceed to assigning numbers to the remaining buses in
546 * order to avoid overlaps between old and new bus numbers.
548 int __devinit pci_scan_bridge(struct pci_bus *bus, struct pci_dev *dev, int max, int pass)
550 struct pci_bus *child;
551 int is_cardbus = (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS);
555 pci_read_config_dword(dev, PCI_PRIMARY_BUS, &buses);
557 dev_dbg(&dev->dev, "scanning behind bridge, config %06x, pass %d\n",
558 buses & 0xffffff, pass);
560 /* Disable MasterAbortMode during probing to avoid reporting
561 of bus errors (in some architectures) */
562 pci_read_config_word(dev, PCI_BRIDGE_CONTROL, &bctl);
563 pci_write_config_word(dev, PCI_BRIDGE_CONTROL,
564 bctl & ~PCI_BRIDGE_CTL_MASTER_ABORT);
566 if ((buses & 0xffff00) && !pcibios_assign_all_busses() && !is_cardbus) {
567 unsigned int cmax, busnr;
569 * Bus already configured by firmware, process it in the first
570 * pass and just note the configuration.
574 busnr = (buses >> 8) & 0xFF;
577 * If we already got to this bus through a different bridge,
578 * ignore it. This can happen with the i450NX chipset.
580 if (pci_find_bus(pci_domain_nr(bus), busnr)) {
581 dev_info(&dev->dev, "bus %04x:%02x already known\n",
582 pci_domain_nr(bus), busnr);
586 child = pci_add_new_bus(bus, dev, busnr);
589 child->primary = buses & 0xFF;
590 child->subordinate = (buses >> 16) & 0xFF;
591 child->bridge_ctl = bctl;
593 cmax = pci_scan_child_bus(child);
596 if (child->subordinate > max)
597 max = child->subordinate;
600 * We need to assign a number to this bus which we always
601 * do in the second pass.
604 if (pcibios_assign_all_busses())
605 /* Temporarily disable forwarding of the
606 configuration cycles on all bridges in
607 this bus segment to avoid possible
608 conflicts in the second pass between two
609 bridges programmed with overlapping
611 pci_write_config_dword(dev, PCI_PRIMARY_BUS,
617 pci_write_config_word(dev, PCI_STATUS, 0xffff);
619 /* Prevent assigning a bus number that already exists.
620 * This can happen when a bridge is hot-plugged */
621 if (pci_find_bus(pci_domain_nr(bus), max+1))
623 child = pci_add_new_bus(bus, dev, ++max);
624 buses = (buses & 0xff000000)
625 | ((unsigned int)(child->primary) << 0)
626 | ((unsigned int)(child->secondary) << 8)
627 | ((unsigned int)(child->subordinate) << 16);
630 * yenta.c forces a secondary latency timer of 176.
631 * Copy that behaviour here.
634 buses &= ~0xff000000;
635 buses |= CARDBUS_LATENCY_TIMER << 24;
639 * We need to blast all three values with a single write.
641 pci_write_config_dword(dev, PCI_PRIMARY_BUS, buses);
644 child->bridge_ctl = bctl;
646 * Adjust subordinate busnr in parent buses.
647 * We do this before scanning for children because
648 * some devices may not be detected if the bios
651 pci_fixup_parent_subordinate_busnr(child, max);
652 /* Now we can scan all subordinate buses... */
653 max = pci_scan_child_bus(child);
655 * now fix it up again since we have found
656 * the real value of max.
658 pci_fixup_parent_subordinate_busnr(child, max);
661 * For CardBus bridges, we leave 4 bus numbers
662 * as cards with a PCI-to-PCI bridge can be
665 for (i=0; i<CARDBUS_RESERVE_BUSNR; i++) {
666 struct pci_bus *parent = bus;
667 if (pci_find_bus(pci_domain_nr(bus),
670 while (parent->parent) {
671 if ((!pcibios_assign_all_busses()) &&
672 (parent->subordinate > max) &&
673 (parent->subordinate <= max+i)) {
676 parent = parent->parent;
680 * Often, there are two cardbus bridges
681 * -- try to leave one valid bus number
689 pci_fixup_parent_subordinate_busnr(child, max);
692 * Set the subordinate bus number to its real value.
694 child->subordinate = max;
695 pci_write_config_byte(dev, PCI_SUBORDINATE_BUS, max);
699 (is_cardbus ? "PCI CardBus %04x:%02x" : "PCI Bus %04x:%02x"),
700 pci_domain_nr(bus), child->number);
702 /* Has only triggered on CardBus, fixup is in yenta_socket */
703 while (bus->parent) {
704 if ((child->subordinate > bus->subordinate) ||
705 (child->number > bus->subordinate) ||
706 (child->number < bus->number) ||
707 (child->subordinate < bus->number)) {
708 pr_debug("PCI: Bus #%02x (-#%02x) is %s "
709 "hidden behind%s bridge #%02x (-#%02x)\n",
710 child->number, child->subordinate,
711 (bus->number > child->subordinate &&
712 bus->subordinate < child->number) ?
713 "wholly" : "partially",
714 bus->self->transparent ? " transparent" : "",
715 bus->number, bus->subordinate);
721 pci_write_config_word(dev, PCI_BRIDGE_CONTROL, bctl);
727 * Read interrupt line and base address registers.
728 * The architecture-dependent code can tweak these, of course.
730 static void pci_read_irq(struct pci_dev *dev)
734 pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &irq);
737 pci_read_config_byte(dev, PCI_INTERRUPT_LINE, &irq);
741 #define LEGACY_IO_RESOURCE (IORESOURCE_IO | IORESOURCE_PCI_FIXED)
744 * pci_setup_device - fill in class and map information of a device
745 * @dev: the device structure to fill
747 * Initialize the device structure with information about the device's
748 * vendor,class,memory and IO-space addresses,IRQ lines etc.
749 * Called at initialisation of the PCI subsystem and by CardBus services.
750 * Returns 0 on success and -1 if unknown type of device (not normal, bridge
753 static int pci_setup_device(struct pci_dev * dev)
757 dev_set_name(&dev->dev, "%04x:%02x:%02x.%d", pci_domain_nr(dev->bus),
758 dev->bus->number, PCI_SLOT(dev->devfn),
759 PCI_FUNC(dev->devfn));
761 pci_read_config_dword(dev, PCI_CLASS_REVISION, &class);
762 dev->revision = class & 0xff;
763 class >>= 8; /* upper 3 bytes */
767 dev_dbg(&dev->dev, "found [%04x/%04x] class %06x header type %02x\n",
768 dev->vendor, dev->device, class, dev->hdr_type);
770 /* "Unknown power state" */
771 dev->current_state = PCI_UNKNOWN;
773 /* Early fixups, before probing the BARs */
774 pci_fixup_device(pci_fixup_early, dev);
775 class = dev->class >> 8;
777 switch (dev->hdr_type) { /* header type */
778 case PCI_HEADER_TYPE_NORMAL: /* standard header */
779 if (class == PCI_CLASS_BRIDGE_PCI)
782 pci_read_bases(dev, 6, PCI_ROM_ADDRESS);
783 pci_read_config_word(dev, PCI_SUBSYSTEM_VENDOR_ID, &dev->subsystem_vendor);
784 pci_read_config_word(dev, PCI_SUBSYSTEM_ID, &dev->subsystem_device);
787 * Do the ugly legacy mode stuff here rather than broken chip
788 * quirk code. Legacy mode ATA controllers have fixed
789 * addresses. These are not always echoed in BAR0-3, and
790 * BAR0-3 in a few cases contain junk!
792 if (class == PCI_CLASS_STORAGE_IDE) {
794 pci_read_config_byte(dev, PCI_CLASS_PROG, &progif);
795 if ((progif & 1) == 0) {
796 dev->resource[0].start = 0x1F0;
797 dev->resource[0].end = 0x1F7;
798 dev->resource[0].flags = LEGACY_IO_RESOURCE;
799 dev->resource[1].start = 0x3F6;
800 dev->resource[1].end = 0x3F6;
801 dev->resource[1].flags = LEGACY_IO_RESOURCE;
803 if ((progif & 4) == 0) {
804 dev->resource[2].start = 0x170;
805 dev->resource[2].end = 0x177;
806 dev->resource[2].flags = LEGACY_IO_RESOURCE;
807 dev->resource[3].start = 0x376;
808 dev->resource[3].end = 0x376;
809 dev->resource[3].flags = LEGACY_IO_RESOURCE;
814 case PCI_HEADER_TYPE_BRIDGE: /* bridge header */
815 if (class != PCI_CLASS_BRIDGE_PCI)
817 /* The PCI-to-PCI bridge spec requires that subtractive
818 decoding (i.e. transparent) bridge must have programming
819 interface code of 0x01. */
821 dev->transparent = ((dev->class & 0xff) == 1);
822 pci_read_bases(dev, 2, PCI_ROM_ADDRESS1);
825 case PCI_HEADER_TYPE_CARDBUS: /* CardBus bridge header */
826 if (class != PCI_CLASS_BRIDGE_CARDBUS)
829 pci_read_bases(dev, 1, 0);
830 pci_read_config_word(dev, PCI_CB_SUBSYSTEM_VENDOR_ID, &dev->subsystem_vendor);
831 pci_read_config_word(dev, PCI_CB_SUBSYSTEM_ID, &dev->subsystem_device);
834 default: /* unknown header */
835 dev_err(&dev->dev, "unknown header type %02x, "
836 "ignoring device\n", dev->hdr_type);
840 dev_err(&dev->dev, "ignoring class %02x (doesn't match header "
841 "type %02x)\n", class, dev->hdr_type);
842 dev->class = PCI_CLASS_NOT_DEFINED;
845 /* We found a fine healthy device, go go go... */
850 * pci_release_dev - free a pci device structure when all users of it are finished.
851 * @dev: device that's been disconnected
853 * Will be called only by the device core when all users of this pci device are
856 static void pci_release_dev(struct device *dev)
858 struct pci_dev *pci_dev;
860 pci_dev = to_pci_dev(dev);
861 pci_vpd_release(pci_dev);
865 static void set_pcie_port_type(struct pci_dev *pdev)
870 pos = pci_find_capability(pdev, PCI_CAP_ID_EXP);
874 pci_read_config_word(pdev, pos + PCI_EXP_FLAGS, ®16);
875 pdev->pcie_type = (reg16 & PCI_EXP_FLAGS_TYPE) >> 4;
879 * pci_cfg_space_size - get the configuration space size of the PCI device.
882 * Regular PCI devices have 256 bytes, but PCI-X 2 and PCI Express devices
883 * have 4096 bytes. Even if the device is capable, that doesn't mean we can
884 * access it. Maybe we don't have a way to generate extended config space
885 * accesses, or the device is behind a reverse Express bridge. So we try
886 * reading the dword at 0x100 which must either be 0 or a valid extended
889 int pci_cfg_space_size_ext(struct pci_dev *dev)
893 if (pci_read_config_dword(dev, 256, &status) != PCIBIOS_SUCCESSFUL)
895 if (status == 0xffffffff)
898 return PCI_CFG_SPACE_EXP_SIZE;
901 return PCI_CFG_SPACE_SIZE;
904 int pci_cfg_space_size(struct pci_dev *dev)
909 pos = pci_find_capability(dev, PCI_CAP_ID_EXP);
911 pos = pci_find_capability(dev, PCI_CAP_ID_PCIX);
915 pci_read_config_dword(dev, pos + PCI_X_STATUS, &status);
916 if (!(status & (PCI_X_STATUS_266MHZ | PCI_X_STATUS_533MHZ)))
920 return pci_cfg_space_size_ext(dev);
923 return PCI_CFG_SPACE_SIZE;
926 static void pci_release_bus_bridge_dev(struct device *dev)
931 struct pci_dev *alloc_pci_dev(void)
935 dev = kzalloc(sizeof(struct pci_dev), GFP_KERNEL);
939 INIT_LIST_HEAD(&dev->bus_list);
941 pci_msi_init_pci_dev(dev);
945 EXPORT_SYMBOL(alloc_pci_dev);
948 * Read the config data for a PCI device, sanity-check it
949 * and fill in the dev structure...
951 static struct pci_dev *pci_scan_device(struct pci_bus *bus, int devfn)
958 if (pci_bus_read_config_dword(bus, devfn, PCI_VENDOR_ID, &l))
961 /* some broken boards return 0 or ~0 if a slot is empty: */
962 if (l == 0xffffffff || l == 0x00000000 ||
963 l == 0x0000ffff || l == 0xffff0000)
966 /* Configuration request Retry Status */
967 while (l == 0xffff0001) {
970 if (pci_bus_read_config_dword(bus, devfn, PCI_VENDOR_ID, &l))
972 /* Card hasn't responded in 60 seconds? Must be stuck. */
973 if (delay > 60 * 1000) {
974 printk(KERN_WARNING "pci %04x:%02x:%02x.%d: not "
975 "responding\n", pci_domain_nr(bus),
976 bus->number, PCI_SLOT(devfn),
982 if (pci_bus_read_config_byte(bus, devfn, PCI_HEADER_TYPE, &hdr_type))
985 dev = alloc_pci_dev();
990 dev->sysdata = bus->sysdata;
991 dev->dev.parent = bus->bridge;
992 dev->dev.bus = &pci_bus_type;
994 dev->hdr_type = hdr_type & 0x7f;
995 dev->multifunction = !!(hdr_type & 0x80);
996 dev->vendor = l & 0xffff;
997 dev->device = (l >> 16) & 0xffff;
998 dev->cfg_size = pci_cfg_space_size(dev);
999 dev->error_state = pci_channel_io_normal;
1000 set_pcie_port_type(dev);
1002 /* Assume 32-bit PCI; let 64-bit PCI cards (which are far rarer)
1003 set this higher, assuming the system even supports it. */
1004 dev->dma_mask = 0xffffffff;
1005 if (pci_setup_device(dev) < 0) {
1010 pci_vpd_pci22_init(dev);
1015 void pci_device_add(struct pci_dev *dev, struct pci_bus *bus)
1017 device_initialize(&dev->dev);
1018 dev->dev.release = pci_release_dev;
1021 dev->dev.dma_mask = &dev->dma_mask;
1022 dev->dev.dma_parms = &dev->dma_parms;
1023 dev->dev.coherent_dma_mask = 0xffffffffull;
1025 pci_set_dma_max_seg_size(dev, 65536);
1026 pci_set_dma_seg_boundary(dev, 0xffffffff);
1028 /* Fix up broken headers */
1029 pci_fixup_device(pci_fixup_header, dev);
1031 /* Initialize power management of the device */
1035 * Add the device to our list of discovered devices
1036 * and the bus list for fixup functions, etc.
1038 down_write(&pci_bus_sem);
1039 list_add_tail(&dev->bus_list, &bus->devices);
1040 up_write(&pci_bus_sem);
1043 struct pci_dev *__ref pci_scan_single_device(struct pci_bus *bus, int devfn)
1045 struct pci_dev *dev;
1047 dev = pci_scan_device(bus, devfn);
1051 pci_device_add(dev, bus);
1055 EXPORT_SYMBOL(pci_scan_single_device);
1058 * pci_scan_slot - scan a PCI slot on a bus for devices.
1059 * @bus: PCI bus to scan
1060 * @devfn: slot number to scan (must have zero function.)
1062 * Scan a PCI slot on the specified PCI bus for devices, adding
1063 * discovered devices to the @bus->devices list. New devices
1064 * will not have is_added set.
1066 int pci_scan_slot(struct pci_bus *bus, int devfn)
1071 scan_all_fns = pcibios_scan_all_fns(bus, devfn);
1073 for (func = 0; func < 8; func++, devfn++) {
1074 struct pci_dev *dev;
1076 dev = pci_scan_single_device(bus, devfn);
1081 * If this is a single function device,
1082 * don't scan past the first function.
1084 if (!dev->multifunction) {
1086 dev->multifunction = 1;
1092 if (func == 0 && !scan_all_fns)
1097 /* only one slot has pcie device */
1098 if (bus->self && nr)
1099 pcie_aspm_init_link_state(bus->self);
1104 unsigned int __devinit pci_scan_child_bus(struct pci_bus *bus)
1106 unsigned int devfn, pass, max = bus->secondary;
1107 struct pci_dev *dev;
1109 pr_debug("PCI: Scanning bus %04x:%02x\n", pci_domain_nr(bus), bus->number);
1111 /* Go find them, Rover! */
1112 for (devfn = 0; devfn < 0x100; devfn += 8)
1113 pci_scan_slot(bus, devfn);
1116 * After performing arch-dependent fixup of the bus, look behind
1117 * all PCI-to-PCI bridges on this bus.
1119 pr_debug("PCI: Fixups for bus %04x:%02x\n", pci_domain_nr(bus), bus->number);
1120 pcibios_fixup_bus(bus);
1121 for (pass=0; pass < 2; pass++)
1122 list_for_each_entry(dev, &bus->devices, bus_list) {
1123 if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE ||
1124 dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)
1125 max = pci_scan_bridge(bus, dev, max, pass);
1129 * We've scanned the bus and so we know all about what's on
1130 * the other side of any bridges that may be on this bus plus
1133 * Return how far we've got finding sub-buses.
1135 pr_debug("PCI: Bus scan for %04x:%02x returning with max=%02x\n",
1136 pci_domain_nr(bus), bus->number, max);
1140 void __attribute__((weak)) set_pci_bus_resources_arch_default(struct pci_bus *b)
1144 struct pci_bus * pci_create_bus(struct device *parent,
1145 int bus, struct pci_ops *ops, void *sysdata)
1151 b = pci_alloc_bus();
1155 dev = kmalloc(sizeof(*dev), GFP_KERNEL);
1161 b->sysdata = sysdata;
1164 if (pci_find_bus(pci_domain_nr(b), bus)) {
1165 /* If we already got to this bus through a different bridge, ignore it */
1166 pr_debug("PCI: Bus %04x:%02x already known\n", pci_domain_nr(b), bus);
1170 down_write(&pci_bus_sem);
1171 list_add_tail(&b->node, &pci_root_buses);
1172 up_write(&pci_bus_sem);
1174 memset(dev, 0, sizeof(*dev));
1175 dev->parent = parent;
1176 dev->release = pci_release_bus_bridge_dev;
1177 sprintf(dev->bus_id, "pci%04x:%02x", pci_domain_nr(b), bus);
1178 error = device_register(dev);
1181 b->bridge = get_device(dev);
1184 set_dev_node(b->bridge, pcibus_to_node(b));
1186 b->dev.class = &pcibus_class;
1187 b->dev.parent = b->bridge;
1188 sprintf(b->dev.bus_id, "%04x:%02x", pci_domain_nr(b), bus);
1189 error = device_register(&b->dev);
1191 goto class_dev_reg_err;
1192 error = device_create_file(&b->dev, &dev_attr_cpuaffinity);
1194 goto dev_create_file_err;
1196 /* Create legacy_io and legacy_mem files for this bus */
1197 pci_create_legacy_files(b);
1199 b->number = b->secondary = bus;
1200 b->resource[0] = &ioport_resource;
1201 b->resource[1] = &iomem_resource;
1203 set_pci_bus_resources_arch_default(b);
1207 dev_create_file_err:
1208 device_unregister(&b->dev);
1210 device_unregister(dev);
1212 down_write(&pci_bus_sem);
1214 up_write(&pci_bus_sem);
1221 struct pci_bus * __devinit pci_scan_bus_parented(struct device *parent,
1222 int bus, struct pci_ops *ops, void *sysdata)
1226 b = pci_create_bus(parent, bus, ops, sysdata);
1228 b->subordinate = pci_scan_child_bus(b);
1231 EXPORT_SYMBOL(pci_scan_bus_parented);
1233 #ifdef CONFIG_HOTPLUG
1234 EXPORT_SYMBOL(pci_add_new_bus);
1235 EXPORT_SYMBOL(pci_scan_slot);
1236 EXPORT_SYMBOL(pci_scan_bridge);
1237 EXPORT_SYMBOL_GPL(pci_scan_child_bus);
1240 static int __init pci_sort_bf_cmp(const struct device *d_a, const struct device *d_b)
1242 const struct pci_dev *a = to_pci_dev(d_a);
1243 const struct pci_dev *b = to_pci_dev(d_b);
1245 if (pci_domain_nr(a->bus) < pci_domain_nr(b->bus)) return -1;
1246 else if (pci_domain_nr(a->bus) > pci_domain_nr(b->bus)) return 1;
1248 if (a->bus->number < b->bus->number) return -1;
1249 else if (a->bus->number > b->bus->number) return 1;
1251 if (a->devfn < b->devfn) return -1;
1252 else if (a->devfn > b->devfn) return 1;
1257 void __init pci_sort_breadthfirst(void)
1259 bus_sort_breadthfirst(&pci_bus_type, &pci_sort_bf_cmp);