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
18 /* Ugh. Need to stop exporting this to modules. */
19 LIST_HEAD(pci_root_buses);
20 EXPORT_SYMBOL(pci_root_buses);
23 static int find_anything(struct device *dev, void *data)
29 * Some device drivers need know if pci is initiated.
30 * Basically, we think pci is not initiated when there
31 * is no device to be found on the pci_bus_type.
33 int no_pci_devices(void)
38 dev = bus_find_device(&pci_bus_type, NULL, NULL, find_anything);
39 no_devices = (dev == NULL);
43 EXPORT_SYMBOL(no_pci_devices);
46 * PCI Bus Class Devices
48 static ssize_t pci_bus_show_cpuaffinity(struct device *dev,
50 struct device_attribute *attr,
56 cpumask = pcibus_to_cpumask(to_pci_bus(dev));
58 cpulist_scnprintf(buf, PAGE_SIZE-2, cpumask):
59 cpumask_scnprintf(buf, PAGE_SIZE-2, cpumask);
65 static ssize_t inline pci_bus_show_cpumaskaffinity(struct device *dev,
66 struct device_attribute *attr,
69 return pci_bus_show_cpuaffinity(dev, 0, attr, buf);
72 static ssize_t inline pci_bus_show_cpulistaffinity(struct device *dev,
73 struct device_attribute *attr,
76 return pci_bus_show_cpuaffinity(dev, 1, attr, buf);
79 DEVICE_ATTR(cpuaffinity, S_IRUGO, pci_bus_show_cpumaskaffinity, NULL);
80 DEVICE_ATTR(cpulistaffinity, S_IRUGO, pci_bus_show_cpulistaffinity, NULL);
85 static void release_pcibus_dev(struct device *dev)
87 struct pci_bus *pci_bus = to_pci_bus(dev);
90 put_device(pci_bus->bridge);
94 static struct class pcibus_class = {
96 .dev_release = &release_pcibus_dev,
99 static int __init pcibus_class_init(void)
101 return class_register(&pcibus_class);
103 postcore_initcall(pcibus_class_init);
106 * Translate the low bits of the PCI base
107 * to the resource type
109 static inline unsigned int pci_calc_resource_flags(unsigned int flags)
111 if (flags & PCI_BASE_ADDRESS_SPACE_IO)
112 return IORESOURCE_IO;
114 if (flags & PCI_BASE_ADDRESS_MEM_PREFETCH)
115 return IORESOURCE_MEM | IORESOURCE_PREFETCH;
117 return IORESOURCE_MEM;
120 static u64 pci_size(u64 base, u64 maxbase, u64 mask)
122 u64 size = mask & maxbase; /* Find the significant bits */
126 /* Get the lowest of them to find the decode size, and
127 from that the extent. */
128 size = (size & ~(size-1)) - 1;
130 /* base == maxbase can be valid only if the BAR has
131 already been programmed with all 1s. */
132 if (base == maxbase && ((base | size) & mask) != mask)
139 pci_bar_unknown, /* Standard PCI BAR probe */
140 pci_bar_io, /* An io port BAR */
141 pci_bar_mem32, /* A 32-bit memory BAR */
142 pci_bar_mem64, /* A 64-bit memory BAR */
145 static inline enum pci_bar_type decode_bar(struct resource *res, u32 bar)
147 if ((bar & PCI_BASE_ADDRESS_SPACE) == PCI_BASE_ADDRESS_SPACE_IO) {
148 res->flags = bar & ~PCI_BASE_ADDRESS_IO_MASK;
152 res->flags = bar & ~PCI_BASE_ADDRESS_MEM_MASK;
154 if (res->flags & PCI_BASE_ADDRESS_MEM_TYPE_64)
155 return pci_bar_mem64;
156 return pci_bar_mem32;
160 * If the type is not unknown, we assume that the lowest bit is 'enable'.
161 * Returns 1 if the BAR was 64-bit and 0 if it was 32-bit.
163 static int __pci_read_base(struct pci_dev *dev, enum pci_bar_type type,
164 struct resource *res, unsigned int pos)
168 mask = type ? ~PCI_ROM_ADDRESS_ENABLE : ~0;
170 res->name = pci_name(dev);
172 pci_read_config_dword(dev, pos, &l);
173 pci_write_config_dword(dev, pos, mask);
174 pci_read_config_dword(dev, pos, &sz);
175 pci_write_config_dword(dev, pos, l);
178 * All bits set in sz means the device isn't working properly.
179 * If the BAR isn't implemented, all bits must be 0. If it's a
180 * memory BAR or a ROM, bit 0 must be clear; if it's an io BAR, bit
183 if (!sz || sz == 0xffffffff)
187 * I don't know how l can have all bits set. Copied from old code.
188 * Maybe it fixes a bug on some ancient platform.
193 if (type == pci_bar_unknown) {
194 type = decode_bar(res, l);
195 res->flags |= pci_calc_resource_flags(l) | IORESOURCE_SIZEALIGN;
196 if (type == pci_bar_io) {
197 l &= PCI_BASE_ADDRESS_IO_MASK;
198 mask = PCI_BASE_ADDRESS_IO_MASK & 0xffff;
200 l &= PCI_BASE_ADDRESS_MEM_MASK;
201 mask = (u32)PCI_BASE_ADDRESS_MEM_MASK;
204 res->flags |= (l & IORESOURCE_ROM_ENABLE);
205 l &= PCI_ROM_ADDRESS_MASK;
206 mask = (u32)PCI_ROM_ADDRESS_MASK;
209 if (type == pci_bar_mem64) {
212 u64 mask64 = mask | (u64)~0 << 32;
214 pci_read_config_dword(dev, pos + 4, &l);
215 pci_write_config_dword(dev, pos + 4, ~0);
216 pci_read_config_dword(dev, pos + 4, &sz);
217 pci_write_config_dword(dev, pos + 4, l);
219 l64 |= ((u64)l << 32);
220 sz64 |= ((u64)sz << 32);
222 sz64 = pci_size(l64, sz64, mask64);
227 if ((sizeof(resource_size_t) < 8) && (sz64 > 0x100000000ULL)) {
228 dev_err(&dev->dev, "can't handle 64-bit BAR\n");
230 } else if ((sizeof(resource_size_t) < 8) && l) {
231 /* Address above 32-bit boundary; disable the BAR */
232 pci_write_config_dword(dev, pos, 0);
233 pci_write_config_dword(dev, pos + 4, 0);
238 res->end = l64 + sz64;
239 dev_printk(KERN_DEBUG, &dev->dev,
240 "reg %x 64bit mmio: %pR\n", pos, res);
243 sz = pci_size(l, sz, mask);
251 dev_printk(KERN_DEBUG, &dev->dev, "reg %x %s: %pR\n", pos,
252 (res->flags & IORESOURCE_IO) ? "io port" : "32bit mmio",
257 return (type == pci_bar_mem64) ? 1 : 0;
263 static void pci_read_bases(struct pci_dev *dev, unsigned int howmany, int rom)
265 unsigned int pos, reg;
267 for (pos = 0; pos < howmany; pos++) {
268 struct resource *res = &dev->resource[pos];
269 reg = PCI_BASE_ADDRESS_0 + (pos << 2);
270 pos += __pci_read_base(dev, pci_bar_unknown, res, reg);
274 struct resource *res = &dev->resource[PCI_ROM_RESOURCE];
275 dev->rom_base_reg = rom;
276 res->flags = IORESOURCE_MEM | IORESOURCE_PREFETCH |
277 IORESOURCE_READONLY | IORESOURCE_CACHEABLE |
278 IORESOURCE_SIZEALIGN;
279 __pci_read_base(dev, pci_bar_mem32, res, rom);
283 void __devinit pci_read_bridge_bases(struct pci_bus *child)
285 struct pci_dev *dev = child->self;
286 u8 io_base_lo, io_limit_lo;
287 u16 mem_base_lo, mem_limit_lo;
288 unsigned long base, limit;
289 struct resource *res;
292 if (!dev) /* It's a host bus, nothing to read */
295 if (dev->transparent) {
296 dev_info(&dev->dev, "transparent bridge\n");
297 for(i = 3; i < PCI_BUS_NUM_RESOURCES; i++)
298 child->resource[i] = child->parent->resource[i - 3];
302 child->resource[i] = &dev->resource[PCI_BRIDGE_RESOURCES+i];
304 res = child->resource[0];
305 pci_read_config_byte(dev, PCI_IO_BASE, &io_base_lo);
306 pci_read_config_byte(dev, PCI_IO_LIMIT, &io_limit_lo);
307 base = (io_base_lo & PCI_IO_RANGE_MASK) << 8;
308 limit = (io_limit_lo & PCI_IO_RANGE_MASK) << 8;
310 if ((io_base_lo & PCI_IO_RANGE_TYPE_MASK) == PCI_IO_RANGE_TYPE_32) {
311 u16 io_base_hi, io_limit_hi;
312 pci_read_config_word(dev, PCI_IO_BASE_UPPER16, &io_base_hi);
313 pci_read_config_word(dev, PCI_IO_LIMIT_UPPER16, &io_limit_hi);
314 base |= (io_base_hi << 16);
315 limit |= (io_limit_hi << 16);
319 res->flags = (io_base_lo & PCI_IO_RANGE_TYPE_MASK) | IORESOURCE_IO;
323 res->end = limit + 0xfff;
324 dev_printk(KERN_DEBUG, &dev->dev, "bridge io port: %pR\n", res);
327 res = child->resource[1];
328 pci_read_config_word(dev, PCI_MEMORY_BASE, &mem_base_lo);
329 pci_read_config_word(dev, PCI_MEMORY_LIMIT, &mem_limit_lo);
330 base = (mem_base_lo & PCI_MEMORY_RANGE_MASK) << 16;
331 limit = (mem_limit_lo & PCI_MEMORY_RANGE_MASK) << 16;
333 res->flags = (mem_base_lo & PCI_MEMORY_RANGE_TYPE_MASK) | IORESOURCE_MEM;
335 res->end = limit + 0xfffff;
336 dev_printk(KERN_DEBUG, &dev->dev, "bridge 32bit mmio: %pR\n",
340 res = child->resource[2];
341 pci_read_config_word(dev, PCI_PREF_MEMORY_BASE, &mem_base_lo);
342 pci_read_config_word(dev, PCI_PREF_MEMORY_LIMIT, &mem_limit_lo);
343 base = (mem_base_lo & PCI_PREF_RANGE_MASK) << 16;
344 limit = (mem_limit_lo & PCI_PREF_RANGE_MASK) << 16;
346 if ((mem_base_lo & PCI_PREF_RANGE_TYPE_MASK) == PCI_PREF_RANGE_TYPE_64) {
347 u32 mem_base_hi, mem_limit_hi;
348 pci_read_config_dword(dev, PCI_PREF_BASE_UPPER32, &mem_base_hi);
349 pci_read_config_dword(dev, PCI_PREF_LIMIT_UPPER32, &mem_limit_hi);
352 * Some bridges set the base > limit by default, and some
353 * (broken) BIOSes do not initialize them. If we find
354 * this, just assume they are not being used.
356 if (mem_base_hi <= mem_limit_hi) {
357 #if BITS_PER_LONG == 64
358 base |= ((long) mem_base_hi) << 32;
359 limit |= ((long) mem_limit_hi) << 32;
361 if (mem_base_hi || mem_limit_hi) {
362 dev_err(&dev->dev, "can't handle 64-bit "
363 "address space for bridge\n");
370 res->flags = (mem_base_lo & PCI_MEMORY_RANGE_TYPE_MASK) | IORESOURCE_MEM | IORESOURCE_PREFETCH;
372 res->end = limit + 0xfffff;
373 dev_printk(KERN_DEBUG, &dev->dev, "bridge %sbit mmio pref: %pR\n",
374 (res->flags & PCI_PREF_RANGE_TYPE_64) ? "64" : "32",
379 static struct pci_bus * pci_alloc_bus(void)
383 b = kzalloc(sizeof(*b), GFP_KERNEL);
385 INIT_LIST_HEAD(&b->node);
386 INIT_LIST_HEAD(&b->children);
387 INIT_LIST_HEAD(&b->devices);
388 INIT_LIST_HEAD(&b->slots);
393 static struct pci_bus *pci_alloc_child_bus(struct pci_bus *parent,
394 struct pci_dev *bridge, int busnr)
396 struct pci_bus *child;
400 * Allocate a new bus, and inherit stuff from the parent..
402 child = pci_alloc_bus();
406 child->self = bridge;
407 child->parent = parent;
408 child->ops = parent->ops;
409 child->sysdata = parent->sysdata;
410 child->bus_flags = parent->bus_flags;
411 child->bridge = get_device(&bridge->dev);
413 /* initialize some portions of the bus device, but don't register it
414 * now as the parent is not properly set up yet. This device will get
415 * registered later in pci_bus_add_devices()
417 child->dev.class = &pcibus_class;
418 sprintf(child->dev.bus_id, "%04x:%02x", pci_domain_nr(child), busnr);
421 * Set up the primary, secondary and subordinate
424 child->number = child->secondary = busnr;
425 child->primary = parent->secondary;
426 child->subordinate = 0xff;
428 /* Set up default resource pointers and names.. */
429 for (i = 0; i < 4; i++) {
430 child->resource[i] = &bridge->resource[PCI_BRIDGE_RESOURCES+i];
431 child->resource[i]->name = child->name;
433 bridge->subordinate = child;
438 struct pci_bus *__ref pci_add_new_bus(struct pci_bus *parent, struct pci_dev *dev, int busnr)
440 struct pci_bus *child;
442 child = pci_alloc_child_bus(parent, dev, busnr);
444 down_write(&pci_bus_sem);
445 list_add_tail(&child->node, &parent->children);
446 up_write(&pci_bus_sem);
451 static void pci_fixup_parent_subordinate_busnr(struct pci_bus *child, int max)
453 struct pci_bus *parent = child->parent;
455 /* Attempts to fix that up are really dangerous unless
456 we're going to re-assign all bus numbers. */
457 if (!pcibios_assign_all_busses())
460 while (parent->parent && parent->subordinate < max) {
461 parent->subordinate = max;
462 pci_write_config_byte(parent->self, PCI_SUBORDINATE_BUS, max);
463 parent = parent->parent;
468 * If it's a bridge, configure it and scan the bus behind it.
469 * For CardBus bridges, we don't scan behind as the devices will
470 * be handled by the bridge driver itself.
472 * We need to process bridges in two passes -- first we scan those
473 * already configured by the BIOS and after we are done with all of
474 * them, we proceed to assigning numbers to the remaining buses in
475 * order to avoid overlaps between old and new bus numbers.
477 int __devinit pci_scan_bridge(struct pci_bus *bus, struct pci_dev *dev, int max, int pass)
479 struct pci_bus *child;
480 int is_cardbus = (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS);
485 pci_read_config_dword(dev, PCI_PRIMARY_BUS, &buses);
487 dev_dbg(&dev->dev, "scanning behind bridge, config %06x, pass %d\n",
488 buses & 0xffffff, pass);
490 /* Check if setup is sensible at all */
492 ((buses & 0xff) != bus->number || ((buses >> 8) & 0xff) <= bus->number)) {
493 dev_dbg(&dev->dev, "bus configuration invalid, reconfiguring\n");
497 /* Disable MasterAbortMode during probing to avoid reporting
498 of bus errors (in some architectures) */
499 pci_read_config_word(dev, PCI_BRIDGE_CONTROL, &bctl);
500 pci_write_config_word(dev, PCI_BRIDGE_CONTROL,
501 bctl & ~PCI_BRIDGE_CTL_MASTER_ABORT);
503 if ((buses & 0xffff00) && !pcibios_assign_all_busses() && !is_cardbus && !broken) {
504 unsigned int cmax, busnr;
506 * Bus already configured by firmware, process it in the first
507 * pass and just note the configuration.
511 busnr = (buses >> 8) & 0xFF;
514 * If we already got to this bus through a different bridge,
515 * ignore it. This can happen with the i450NX chipset.
517 if (pci_find_bus(pci_domain_nr(bus), busnr)) {
518 dev_info(&dev->dev, "bus %04x:%02x already known\n",
519 pci_domain_nr(bus), busnr);
523 child = pci_add_new_bus(bus, dev, busnr);
526 child->primary = buses & 0xFF;
527 child->subordinate = (buses >> 16) & 0xFF;
528 child->bridge_ctl = bctl;
530 cmax = pci_scan_child_bus(child);
533 if (child->subordinate > max)
534 max = child->subordinate;
537 * We need to assign a number to this bus which we always
538 * do in the second pass.
541 if (pcibios_assign_all_busses() || broken)
542 /* Temporarily disable forwarding of the
543 configuration cycles on all bridges in
544 this bus segment to avoid possible
545 conflicts in the second pass between two
546 bridges programmed with overlapping
548 pci_write_config_dword(dev, PCI_PRIMARY_BUS,
554 pci_write_config_word(dev, PCI_STATUS, 0xffff);
556 /* Prevent assigning a bus number that already exists.
557 * This can happen when a bridge is hot-plugged */
558 if (pci_find_bus(pci_domain_nr(bus), max+1))
560 child = pci_add_new_bus(bus, dev, ++max);
561 buses = (buses & 0xff000000)
562 | ((unsigned int)(child->primary) << 0)
563 | ((unsigned int)(child->secondary) << 8)
564 | ((unsigned int)(child->subordinate) << 16);
567 * yenta.c forces a secondary latency timer of 176.
568 * Copy that behaviour here.
571 buses &= ~0xff000000;
572 buses |= CARDBUS_LATENCY_TIMER << 24;
576 * We need to blast all three values with a single write.
578 pci_write_config_dword(dev, PCI_PRIMARY_BUS, buses);
581 child->bridge_ctl = bctl;
583 * Adjust subordinate busnr in parent buses.
584 * We do this before scanning for children because
585 * some devices may not be detected if the bios
588 pci_fixup_parent_subordinate_busnr(child, max);
589 /* Now we can scan all subordinate buses... */
590 max = pci_scan_child_bus(child);
592 * now fix it up again since we have found
593 * the real value of max.
595 pci_fixup_parent_subordinate_busnr(child, max);
598 * For CardBus bridges, we leave 4 bus numbers
599 * as cards with a PCI-to-PCI bridge can be
602 for (i=0; i<CARDBUS_RESERVE_BUSNR; i++) {
603 struct pci_bus *parent = bus;
604 if (pci_find_bus(pci_domain_nr(bus),
607 while (parent->parent) {
608 if ((!pcibios_assign_all_busses()) &&
609 (parent->subordinate > max) &&
610 (parent->subordinate <= max+i)) {
613 parent = parent->parent;
617 * Often, there are two cardbus bridges
618 * -- try to leave one valid bus number
626 pci_fixup_parent_subordinate_busnr(child, max);
629 * Set the subordinate bus number to its real value.
631 child->subordinate = max;
632 pci_write_config_byte(dev, PCI_SUBORDINATE_BUS, max);
636 (is_cardbus ? "PCI CardBus %04x:%02x" : "PCI Bus %04x:%02x"),
637 pci_domain_nr(bus), child->number);
639 /* Has only triggered on CardBus, fixup is in yenta_socket */
640 while (bus->parent) {
641 if ((child->subordinate > bus->subordinate) ||
642 (child->number > bus->subordinate) ||
643 (child->number < bus->number) ||
644 (child->subordinate < bus->number)) {
645 pr_debug("PCI: Bus #%02x (-#%02x) is %s "
646 "hidden behind%s bridge #%02x (-#%02x)\n",
647 child->number, child->subordinate,
648 (bus->number > child->subordinate &&
649 bus->subordinate < child->number) ?
650 "wholly" : "partially",
651 bus->self->transparent ? " transparent" : "",
652 bus->number, bus->subordinate);
658 pci_write_config_word(dev, PCI_BRIDGE_CONTROL, bctl);
664 * Read interrupt line and base address registers.
665 * The architecture-dependent code can tweak these, of course.
667 static void pci_read_irq(struct pci_dev *dev)
671 pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &irq);
674 pci_read_config_byte(dev, PCI_INTERRUPT_LINE, &irq);
678 #define LEGACY_IO_RESOURCE (IORESOURCE_IO | IORESOURCE_PCI_FIXED)
681 * pci_setup_device - fill in class and map information of a device
682 * @dev: the device structure to fill
684 * Initialize the device structure with information about the device's
685 * vendor,class,memory and IO-space addresses,IRQ lines etc.
686 * Called at initialisation of the PCI subsystem and by CardBus services.
687 * Returns 0 on success and -1 if unknown type of device (not normal, bridge
690 static int pci_setup_device(struct pci_dev * dev)
694 dev_set_name(&dev->dev, "%04x:%02x:%02x.%d", pci_domain_nr(dev->bus),
695 dev->bus->number, PCI_SLOT(dev->devfn),
696 PCI_FUNC(dev->devfn));
698 pci_read_config_dword(dev, PCI_CLASS_REVISION, &class);
699 dev->revision = class & 0xff;
700 class >>= 8; /* upper 3 bytes */
704 dev_dbg(&dev->dev, "found [%04x:%04x] class %06x header type %02x\n",
705 dev->vendor, dev->device, class, dev->hdr_type);
707 /* "Unknown power state" */
708 dev->current_state = PCI_UNKNOWN;
710 /* Early fixups, before probing the BARs */
711 pci_fixup_device(pci_fixup_early, dev);
712 class = dev->class >> 8;
714 switch (dev->hdr_type) { /* header type */
715 case PCI_HEADER_TYPE_NORMAL: /* standard header */
716 if (class == PCI_CLASS_BRIDGE_PCI)
719 pci_read_bases(dev, 6, PCI_ROM_ADDRESS);
720 pci_read_config_word(dev, PCI_SUBSYSTEM_VENDOR_ID, &dev->subsystem_vendor);
721 pci_read_config_word(dev, PCI_SUBSYSTEM_ID, &dev->subsystem_device);
724 * Do the ugly legacy mode stuff here rather than broken chip
725 * quirk code. Legacy mode ATA controllers have fixed
726 * addresses. These are not always echoed in BAR0-3, and
727 * BAR0-3 in a few cases contain junk!
729 if (class == PCI_CLASS_STORAGE_IDE) {
731 pci_read_config_byte(dev, PCI_CLASS_PROG, &progif);
732 if ((progif & 1) == 0) {
733 dev->resource[0].start = 0x1F0;
734 dev->resource[0].end = 0x1F7;
735 dev->resource[0].flags = LEGACY_IO_RESOURCE;
736 dev->resource[1].start = 0x3F6;
737 dev->resource[1].end = 0x3F6;
738 dev->resource[1].flags = LEGACY_IO_RESOURCE;
740 if ((progif & 4) == 0) {
741 dev->resource[2].start = 0x170;
742 dev->resource[2].end = 0x177;
743 dev->resource[2].flags = LEGACY_IO_RESOURCE;
744 dev->resource[3].start = 0x376;
745 dev->resource[3].end = 0x376;
746 dev->resource[3].flags = LEGACY_IO_RESOURCE;
751 case PCI_HEADER_TYPE_BRIDGE: /* bridge header */
752 if (class != PCI_CLASS_BRIDGE_PCI)
754 /* The PCI-to-PCI bridge spec requires that subtractive
755 decoding (i.e. transparent) bridge must have programming
756 interface code of 0x01. */
758 dev->transparent = ((dev->class & 0xff) == 1);
759 pci_read_bases(dev, 2, PCI_ROM_ADDRESS1);
762 case PCI_HEADER_TYPE_CARDBUS: /* CardBus bridge header */
763 if (class != PCI_CLASS_BRIDGE_CARDBUS)
766 pci_read_bases(dev, 1, 0);
767 pci_read_config_word(dev, PCI_CB_SUBSYSTEM_VENDOR_ID, &dev->subsystem_vendor);
768 pci_read_config_word(dev, PCI_CB_SUBSYSTEM_ID, &dev->subsystem_device);
771 default: /* unknown header */
772 dev_err(&dev->dev, "unknown header type %02x, "
773 "ignoring device\n", dev->hdr_type);
777 dev_err(&dev->dev, "ignoring class %02x (doesn't match header "
778 "type %02x)\n", class, dev->hdr_type);
779 dev->class = PCI_CLASS_NOT_DEFINED;
782 /* We found a fine healthy device, go go go... */
786 static void pci_release_capabilities(struct pci_dev *dev)
788 pci_vpd_release(dev);
792 * pci_release_dev - free a pci device structure when all users of it are finished.
793 * @dev: device that's been disconnected
795 * Will be called only by the device core when all users of this pci device are
798 static void pci_release_dev(struct device *dev)
800 struct pci_dev *pci_dev;
802 pci_dev = to_pci_dev(dev);
803 pci_release_capabilities(pci_dev);
807 static void set_pcie_port_type(struct pci_dev *pdev)
812 pos = pci_find_capability(pdev, PCI_CAP_ID_EXP);
816 pci_read_config_word(pdev, pos + PCI_EXP_FLAGS, ®16);
817 pdev->pcie_type = (reg16 & PCI_EXP_FLAGS_TYPE) >> 4;
821 * pci_cfg_space_size - get the configuration space size of the PCI device.
824 * Regular PCI devices have 256 bytes, but PCI-X 2 and PCI Express devices
825 * have 4096 bytes. Even if the device is capable, that doesn't mean we can
826 * access it. Maybe we don't have a way to generate extended config space
827 * accesses, or the device is behind a reverse Express bridge. So we try
828 * reading the dword at 0x100 which must either be 0 or a valid extended
831 int pci_cfg_space_size_ext(struct pci_dev *dev)
834 int pos = PCI_CFG_SPACE_SIZE;
836 if (pci_read_config_dword(dev, pos, &status) != PCIBIOS_SUCCESSFUL)
838 if (status == 0xffffffff)
841 return PCI_CFG_SPACE_EXP_SIZE;
844 return PCI_CFG_SPACE_SIZE;
847 int pci_cfg_space_size(struct pci_dev *dev)
852 pos = pci_find_capability(dev, PCI_CAP_ID_EXP);
854 pos = pci_find_capability(dev, PCI_CAP_ID_PCIX);
858 pci_read_config_dword(dev, pos + PCI_X_STATUS, &status);
859 if (!(status & (PCI_X_STATUS_266MHZ | PCI_X_STATUS_533MHZ)))
863 return pci_cfg_space_size_ext(dev);
866 return PCI_CFG_SPACE_SIZE;
869 static void pci_release_bus_bridge_dev(struct device *dev)
874 struct pci_dev *alloc_pci_dev(void)
878 dev = kzalloc(sizeof(struct pci_dev), GFP_KERNEL);
882 INIT_LIST_HEAD(&dev->bus_list);
886 EXPORT_SYMBOL(alloc_pci_dev);
889 * Read the config data for a PCI device, sanity-check it
890 * and fill in the dev structure...
892 static struct pci_dev *pci_scan_device(struct pci_bus *bus, int devfn)
895 struct pci_slot *slot;
900 if (pci_bus_read_config_dword(bus, devfn, PCI_VENDOR_ID, &l))
903 /* some broken boards return 0 or ~0 if a slot is empty: */
904 if (l == 0xffffffff || l == 0x00000000 ||
905 l == 0x0000ffff || l == 0xffff0000)
908 /* Configuration request Retry Status */
909 while (l == 0xffff0001) {
912 if (pci_bus_read_config_dword(bus, devfn, PCI_VENDOR_ID, &l))
914 /* Card hasn't responded in 60 seconds? Must be stuck. */
915 if (delay > 60 * 1000) {
916 printk(KERN_WARNING "pci %04x:%02x:%02x.%d: not "
917 "responding\n", pci_domain_nr(bus),
918 bus->number, PCI_SLOT(devfn),
924 if (pci_bus_read_config_byte(bus, devfn, PCI_HEADER_TYPE, &hdr_type))
927 dev = alloc_pci_dev();
932 dev->sysdata = bus->sysdata;
933 dev->dev.parent = bus->bridge;
934 dev->dev.bus = &pci_bus_type;
936 dev->hdr_type = hdr_type & 0x7f;
937 dev->multifunction = !!(hdr_type & 0x80);
938 dev->vendor = l & 0xffff;
939 dev->device = (l >> 16) & 0xffff;
940 dev->cfg_size = pci_cfg_space_size(dev);
941 dev->error_state = pci_channel_io_normal;
942 set_pcie_port_type(dev);
944 list_for_each_entry(slot, &bus->slots, list)
945 if (PCI_SLOT(devfn) == slot->number)
948 /* Assume 32-bit PCI; let 64-bit PCI cards (which are far rarer)
949 set this higher, assuming the system even supports it. */
950 dev->dma_mask = 0xffffffff;
951 if (pci_setup_device(dev) < 0) {
959 static void pci_init_capabilities(struct pci_dev *dev)
962 pci_msi_init_pci_dev(dev);
964 /* Power Management */
967 /* Vital Product Data */
968 pci_vpd_pci22_init(dev);
970 /* Alternative Routing-ID Forwarding */
974 void pci_device_add(struct pci_dev *dev, struct pci_bus *bus)
976 device_initialize(&dev->dev);
977 dev->dev.release = pci_release_dev;
980 dev->dev.dma_mask = &dev->dma_mask;
981 dev->dev.dma_parms = &dev->dma_parms;
982 dev->dev.coherent_dma_mask = 0xffffffffull;
984 pci_set_dma_max_seg_size(dev, 65536);
985 pci_set_dma_seg_boundary(dev, 0xffffffff);
987 /* Fix up broken headers */
988 pci_fixup_device(pci_fixup_header, dev);
990 /* Initialize various capabilities */
991 pci_init_capabilities(dev);
994 * Add the device to our list of discovered devices
995 * and the bus list for fixup functions, etc.
997 down_write(&pci_bus_sem);
998 list_add_tail(&dev->bus_list, &bus->devices);
999 up_write(&pci_bus_sem);
1002 struct pci_dev *__ref pci_scan_single_device(struct pci_bus *bus, int devfn)
1004 struct pci_dev *dev;
1006 dev = pci_scan_device(bus, devfn);
1010 pci_device_add(dev, bus);
1014 EXPORT_SYMBOL(pci_scan_single_device);
1017 * pci_scan_slot - scan a PCI slot on a bus for devices.
1018 * @bus: PCI bus to scan
1019 * @devfn: slot number to scan (must have zero function.)
1021 * Scan a PCI slot on the specified PCI bus for devices, adding
1022 * discovered devices to the @bus->devices list. New devices
1023 * will not have is_added set.
1025 int pci_scan_slot(struct pci_bus *bus, int devfn)
1030 scan_all_fns = pcibios_scan_all_fns(bus, devfn);
1032 for (func = 0; func < 8; func++, devfn++) {
1033 struct pci_dev *dev;
1035 dev = pci_scan_single_device(bus, devfn);
1040 * If this is a single function device,
1041 * don't scan past the first function.
1043 if (!dev->multifunction) {
1045 dev->multifunction = 1;
1051 if (func == 0 && !scan_all_fns)
1056 /* only one slot has pcie device */
1057 if (bus->self && nr)
1058 pcie_aspm_init_link_state(bus->self);
1063 unsigned int __devinit pci_scan_child_bus(struct pci_bus *bus)
1065 unsigned int devfn, pass, max = bus->secondary;
1066 struct pci_dev *dev;
1068 pr_debug("PCI: Scanning bus %04x:%02x\n", pci_domain_nr(bus), bus->number);
1070 /* Go find them, Rover! */
1071 for (devfn = 0; devfn < 0x100; devfn += 8)
1072 pci_scan_slot(bus, devfn);
1075 * After performing arch-dependent fixup of the bus, look behind
1076 * all PCI-to-PCI bridges on this bus.
1078 pr_debug("PCI: Fixups for bus %04x:%02x\n", pci_domain_nr(bus), bus->number);
1079 pcibios_fixup_bus(bus);
1080 for (pass=0; pass < 2; pass++)
1081 list_for_each_entry(dev, &bus->devices, bus_list) {
1082 if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE ||
1083 dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)
1084 max = pci_scan_bridge(bus, dev, max, pass);
1088 * We've scanned the bus and so we know all about what's on
1089 * the other side of any bridges that may be on this bus plus
1092 * Return how far we've got finding sub-buses.
1094 pr_debug("PCI: Bus scan for %04x:%02x returning with max=%02x\n",
1095 pci_domain_nr(bus), bus->number, max);
1099 void __attribute__((weak)) set_pci_bus_resources_arch_default(struct pci_bus *b)
1103 struct pci_bus * pci_create_bus(struct device *parent,
1104 int bus, struct pci_ops *ops, void *sysdata)
1110 b = pci_alloc_bus();
1114 dev = kmalloc(sizeof(*dev), GFP_KERNEL);
1120 b->sysdata = sysdata;
1123 if (pci_find_bus(pci_domain_nr(b), bus)) {
1124 /* If we already got to this bus through a different bridge, ignore it */
1125 pr_debug("PCI: Bus %04x:%02x already known\n", pci_domain_nr(b), bus);
1129 down_write(&pci_bus_sem);
1130 list_add_tail(&b->node, &pci_root_buses);
1131 up_write(&pci_bus_sem);
1133 memset(dev, 0, sizeof(*dev));
1134 dev->parent = parent;
1135 dev->release = pci_release_bus_bridge_dev;
1136 sprintf(dev->bus_id, "pci%04x:%02x", pci_domain_nr(b), bus);
1137 error = device_register(dev);
1140 b->bridge = get_device(dev);
1143 set_dev_node(b->bridge, pcibus_to_node(b));
1145 b->dev.class = &pcibus_class;
1146 b->dev.parent = b->bridge;
1147 sprintf(b->dev.bus_id, "%04x:%02x", pci_domain_nr(b), bus);
1148 error = device_register(&b->dev);
1150 goto class_dev_reg_err;
1151 error = device_create_file(&b->dev, &dev_attr_cpuaffinity);
1153 goto dev_create_file_err;
1155 /* Create legacy_io and legacy_mem files for this bus */
1156 pci_create_legacy_files(b);
1158 b->number = b->secondary = bus;
1159 b->resource[0] = &ioport_resource;
1160 b->resource[1] = &iomem_resource;
1162 set_pci_bus_resources_arch_default(b);
1166 dev_create_file_err:
1167 device_unregister(&b->dev);
1169 device_unregister(dev);
1171 down_write(&pci_bus_sem);
1173 up_write(&pci_bus_sem);
1180 struct pci_bus * __devinit pci_scan_bus_parented(struct device *parent,
1181 int bus, struct pci_ops *ops, void *sysdata)
1185 b = pci_create_bus(parent, bus, ops, sysdata);
1187 b->subordinate = pci_scan_child_bus(b);
1190 EXPORT_SYMBOL(pci_scan_bus_parented);
1192 #ifdef CONFIG_HOTPLUG
1193 EXPORT_SYMBOL(pci_add_new_bus);
1194 EXPORT_SYMBOL(pci_scan_slot);
1195 EXPORT_SYMBOL(pci_scan_bridge);
1196 EXPORT_SYMBOL_GPL(pci_scan_child_bus);
1199 static int __init pci_sort_bf_cmp(const struct device *d_a, const struct device *d_b)
1201 const struct pci_dev *a = to_pci_dev(d_a);
1202 const struct pci_dev *b = to_pci_dev(d_b);
1204 if (pci_domain_nr(a->bus) < pci_domain_nr(b->bus)) return -1;
1205 else if (pci_domain_nr(a->bus) > pci_domain_nr(b->bus)) return 1;
1207 if (a->bus->number < b->bus->number) return -1;
1208 else if (a->bus->number > b->bus->number) return 1;
1210 if (a->devfn < b->devfn) return -1;
1211 else if (a->devfn > b->devfn) return 1;
1216 void __init pci_sort_breadthfirst(void)
1218 bus_sort_breadthfirst(&pci_bus_type, &pci_sort_bf_cmp);