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,
54 const struct cpumask *cpumask;
56 cpumask = cpumask_of_pcibus(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);
91 pci_bus_remove_resources(pci_bus);
95 static struct class pcibus_class = {
97 .dev_release = &release_pcibus_dev,
98 .dev_attrs = pcibus_dev_attrs,
101 static int __init pcibus_class_init(void)
103 return class_register(&pcibus_class);
105 postcore_initcall(pcibus_class_init);
108 * Translate the low bits of the PCI base
109 * to the resource type
111 static inline unsigned int pci_calc_resource_flags(unsigned int flags)
113 if (flags & PCI_BASE_ADDRESS_SPACE_IO)
114 return IORESOURCE_IO;
116 if (flags & PCI_BASE_ADDRESS_MEM_PREFETCH)
117 return IORESOURCE_MEM | IORESOURCE_PREFETCH;
119 return IORESOURCE_MEM;
122 static u64 pci_size(u64 base, u64 maxbase, u64 mask)
124 u64 size = mask & maxbase; /* Find the significant bits */
128 /* Get the lowest of them to find the decode size, and
129 from that the extent. */
130 size = (size & ~(size-1)) - 1;
132 /* base == maxbase can be valid only if the BAR has
133 already been programmed with all 1s. */
134 if (base == maxbase && ((base | size) & mask) != mask)
140 static inline enum pci_bar_type decode_bar(struct resource *res, u32 bar)
142 if ((bar & PCI_BASE_ADDRESS_SPACE) == PCI_BASE_ADDRESS_SPACE_IO) {
143 res->flags = bar & ~PCI_BASE_ADDRESS_IO_MASK;
147 res->flags = bar & ~PCI_BASE_ADDRESS_MEM_MASK;
149 if (res->flags & PCI_BASE_ADDRESS_MEM_TYPE_64)
150 return pci_bar_mem64;
151 return pci_bar_mem32;
155 * pci_read_base - read a PCI BAR
156 * @dev: the PCI device
157 * @type: type of the BAR
158 * @res: resource buffer to be filled in
159 * @pos: BAR position in the config space
161 * Returns 1 if the BAR is 64-bit, or 0 if 32-bit.
163 int __pci_read_base(struct pci_dev *dev, enum pci_bar_type type,
164 struct resource *res, unsigned int pos)
169 mask = type ? PCI_ROM_ADDRESS_MASK : ~0;
171 if (!dev->mmio_always_on) {
172 pci_read_config_word(dev, PCI_COMMAND, &orig_cmd);
173 pci_write_config_word(dev, PCI_COMMAND,
174 orig_cmd & ~(PCI_COMMAND_MEMORY | PCI_COMMAND_IO));
177 res->name = pci_name(dev);
179 pci_read_config_dword(dev, pos, &l);
180 pci_write_config_dword(dev, pos, l | mask);
181 pci_read_config_dword(dev, pos, &sz);
182 pci_write_config_dword(dev, pos, l);
184 if (!dev->mmio_always_on)
185 pci_write_config_word(dev, PCI_COMMAND, orig_cmd);
188 * All bits set in sz means the device isn't working properly.
189 * If the BAR isn't implemented, all bits must be 0. If it's a
190 * memory BAR or a ROM, bit 0 must be clear; if it's an io BAR, bit
193 if (!sz || sz == 0xffffffff)
197 * I don't know how l can have all bits set. Copied from old code.
198 * Maybe it fixes a bug on some ancient platform.
203 if (type == pci_bar_unknown) {
204 type = decode_bar(res, l);
205 res->flags |= pci_calc_resource_flags(l) | IORESOURCE_SIZEALIGN;
206 if (type == pci_bar_io) {
207 l &= PCI_BASE_ADDRESS_IO_MASK;
208 mask = PCI_BASE_ADDRESS_IO_MASK & IO_SPACE_LIMIT;
210 l &= PCI_BASE_ADDRESS_MEM_MASK;
211 mask = (u32)PCI_BASE_ADDRESS_MEM_MASK;
214 res->flags |= (l & IORESOURCE_ROM_ENABLE);
215 l &= PCI_ROM_ADDRESS_MASK;
216 mask = (u32)PCI_ROM_ADDRESS_MASK;
219 if (type == pci_bar_mem64) {
222 u64 mask64 = mask | (u64)~0 << 32;
224 pci_read_config_dword(dev, pos + 4, &l);
225 pci_write_config_dword(dev, pos + 4, ~0);
226 pci_read_config_dword(dev, pos + 4, &sz);
227 pci_write_config_dword(dev, pos + 4, l);
229 l64 |= ((u64)l << 32);
230 sz64 |= ((u64)sz << 32);
232 sz64 = pci_size(l64, sz64, mask64);
237 if ((sizeof(resource_size_t) < 8) && (sz64 > 0x100000000ULL)) {
238 dev_err(&dev->dev, "reg %x: can't handle 64-bit BAR\n",
243 res->flags |= IORESOURCE_MEM_64;
244 if ((sizeof(resource_size_t) < 8) && l) {
245 /* Address above 32-bit boundary; disable the BAR */
246 pci_write_config_dword(dev, pos, 0);
247 pci_write_config_dword(dev, pos + 4, 0);
252 res->end = l64 + sz64;
253 dev_printk(KERN_DEBUG, &dev->dev, "reg %x: %pR\n",
257 sz = pci_size(l, sz, mask);
265 dev_printk(KERN_DEBUG, &dev->dev, "reg %x: %pR\n", pos, res);
269 return (type == pci_bar_mem64) ? 1 : 0;
275 static void pci_read_bases(struct pci_dev *dev, unsigned int howmany, int rom)
277 unsigned int pos, reg;
279 for (pos = 0; pos < howmany; pos++) {
280 struct resource *res = &dev->resource[pos];
281 reg = PCI_BASE_ADDRESS_0 + (pos << 2);
282 pos += __pci_read_base(dev, pci_bar_unknown, res, reg);
286 struct resource *res = &dev->resource[PCI_ROM_RESOURCE];
287 dev->rom_base_reg = rom;
288 res->flags = IORESOURCE_MEM | IORESOURCE_PREFETCH |
289 IORESOURCE_READONLY | IORESOURCE_CACHEABLE |
290 IORESOURCE_SIZEALIGN;
291 __pci_read_base(dev, pci_bar_mem32, res, rom);
295 static void __devinit pci_read_bridge_io(struct pci_bus *child)
297 struct pci_dev *dev = child->self;
298 u8 io_base_lo, io_limit_lo;
299 unsigned long base, limit;
300 struct resource *res;
302 res = child->resource[0];
303 pci_read_config_byte(dev, PCI_IO_BASE, &io_base_lo);
304 pci_read_config_byte(dev, PCI_IO_LIMIT, &io_limit_lo);
305 base = (io_base_lo & PCI_IO_RANGE_MASK) << 8;
306 limit = (io_limit_lo & PCI_IO_RANGE_MASK) << 8;
308 if ((io_base_lo & PCI_IO_RANGE_TYPE_MASK) == PCI_IO_RANGE_TYPE_32) {
309 u16 io_base_hi, io_limit_hi;
310 pci_read_config_word(dev, PCI_IO_BASE_UPPER16, &io_base_hi);
311 pci_read_config_word(dev, PCI_IO_LIMIT_UPPER16, &io_limit_hi);
312 base |= (io_base_hi << 16);
313 limit |= (io_limit_hi << 16);
316 if (base && base <= limit) {
317 res->flags = (io_base_lo & PCI_IO_RANGE_TYPE_MASK) | IORESOURCE_IO;
321 res->end = limit + 0xfff;
322 dev_printk(KERN_DEBUG, &dev->dev, " bridge window %pR\n", res);
324 dev_printk(KERN_DEBUG, &dev->dev,
325 " bridge window [io %#06lx-%#06lx] (disabled)\n",
330 static void __devinit pci_read_bridge_mmio(struct pci_bus *child)
332 struct pci_dev *dev = child->self;
333 u16 mem_base_lo, mem_limit_lo;
334 unsigned long base, limit;
335 struct resource *res;
337 res = child->resource[1];
338 pci_read_config_word(dev, PCI_MEMORY_BASE, &mem_base_lo);
339 pci_read_config_word(dev, PCI_MEMORY_LIMIT, &mem_limit_lo);
340 base = (mem_base_lo & PCI_MEMORY_RANGE_MASK) << 16;
341 limit = (mem_limit_lo & PCI_MEMORY_RANGE_MASK) << 16;
342 if (base && base <= limit) {
343 res->flags = (mem_base_lo & PCI_MEMORY_RANGE_TYPE_MASK) | IORESOURCE_MEM;
345 res->end = limit + 0xfffff;
346 dev_printk(KERN_DEBUG, &dev->dev, " bridge window %pR\n", res);
348 dev_printk(KERN_DEBUG, &dev->dev,
349 " bridge window [mem %#010lx-%#010lx] (disabled)\n",
350 base, limit + 0xfffff);
354 static void __devinit pci_read_bridge_mmio_pref(struct pci_bus *child)
356 struct pci_dev *dev = child->self;
357 u16 mem_base_lo, mem_limit_lo;
358 unsigned long base, limit;
359 struct resource *res;
361 res = child->resource[2];
362 pci_read_config_word(dev, PCI_PREF_MEMORY_BASE, &mem_base_lo);
363 pci_read_config_word(dev, PCI_PREF_MEMORY_LIMIT, &mem_limit_lo);
364 base = (mem_base_lo & PCI_PREF_RANGE_MASK) << 16;
365 limit = (mem_limit_lo & PCI_PREF_RANGE_MASK) << 16;
367 if ((mem_base_lo & PCI_PREF_RANGE_TYPE_MASK) == PCI_PREF_RANGE_TYPE_64) {
368 u32 mem_base_hi, mem_limit_hi;
369 pci_read_config_dword(dev, PCI_PREF_BASE_UPPER32, &mem_base_hi);
370 pci_read_config_dword(dev, PCI_PREF_LIMIT_UPPER32, &mem_limit_hi);
373 * Some bridges set the base > limit by default, and some
374 * (broken) BIOSes do not initialize them. If we find
375 * this, just assume they are not being used.
377 if (mem_base_hi <= mem_limit_hi) {
378 #if BITS_PER_LONG == 64
379 base |= ((long) mem_base_hi) << 32;
380 limit |= ((long) mem_limit_hi) << 32;
382 if (mem_base_hi || mem_limit_hi) {
383 dev_err(&dev->dev, "can't handle 64-bit "
384 "address space for bridge\n");
390 if (base && base <= limit) {
391 res->flags = (mem_base_lo & PCI_PREF_RANGE_TYPE_MASK) |
392 IORESOURCE_MEM | IORESOURCE_PREFETCH;
393 if (res->flags & PCI_PREF_RANGE_TYPE_64)
394 res->flags |= IORESOURCE_MEM_64;
396 res->end = limit + 0xfffff;
397 dev_printk(KERN_DEBUG, &dev->dev, " bridge window %pR\n", res);
399 dev_printk(KERN_DEBUG, &dev->dev,
400 " bridge window [mem %#010lx-%#010lx pref] (disabled)\n",
401 base, limit + 0xfffff);
405 void __devinit pci_read_bridge_bases(struct pci_bus *child)
407 struct pci_dev *dev = child->self;
408 struct resource *res;
411 if (pci_is_root_bus(child)) /* It's a host bus, nothing to read */
414 dev_info(&dev->dev, "PCI bridge to [bus %02x-%02x]%s\n",
415 child->secondary, child->subordinate,
416 dev->transparent ? " (subtractive decode)" : "");
418 pci_bus_remove_resources(child);
419 for (i = 0; i < PCI_BRIDGE_RESOURCE_NUM; i++)
420 child->resource[i] = &dev->resource[PCI_BRIDGE_RESOURCES+i];
422 pci_read_bridge_io(child);
423 pci_read_bridge_mmio(child);
424 pci_read_bridge_mmio_pref(child);
426 if (dev->transparent) {
427 pci_bus_for_each_resource(child->parent, res, i) {
429 pci_bus_add_resource(child, res,
430 PCI_SUBTRACTIVE_DECODE);
431 dev_printk(KERN_DEBUG, &dev->dev,
432 " bridge window %pR (subtractive decode)\n",
439 static struct pci_bus * pci_alloc_bus(void)
443 b = kzalloc(sizeof(*b), GFP_KERNEL);
445 INIT_LIST_HEAD(&b->node);
446 INIT_LIST_HEAD(&b->children);
447 INIT_LIST_HEAD(&b->devices);
448 INIT_LIST_HEAD(&b->slots);
449 INIT_LIST_HEAD(&b->resources);
450 b->max_bus_speed = PCI_SPEED_UNKNOWN;
451 b->cur_bus_speed = PCI_SPEED_UNKNOWN;
456 static unsigned char pcix_bus_speed[] = {
457 PCI_SPEED_UNKNOWN, /* 0 */
458 PCI_SPEED_66MHz_PCIX, /* 1 */
459 PCI_SPEED_100MHz_PCIX, /* 2 */
460 PCI_SPEED_133MHz_PCIX, /* 3 */
461 PCI_SPEED_UNKNOWN, /* 4 */
462 PCI_SPEED_66MHz_PCIX_ECC, /* 5 */
463 PCI_SPEED_100MHz_PCIX_ECC, /* 6 */
464 PCI_SPEED_133MHz_PCIX_ECC, /* 7 */
465 PCI_SPEED_UNKNOWN, /* 8 */
466 PCI_SPEED_66MHz_PCIX_266, /* 9 */
467 PCI_SPEED_100MHz_PCIX_266, /* A */
468 PCI_SPEED_133MHz_PCIX_266, /* B */
469 PCI_SPEED_UNKNOWN, /* C */
470 PCI_SPEED_66MHz_PCIX_533, /* D */
471 PCI_SPEED_100MHz_PCIX_533, /* E */
472 PCI_SPEED_133MHz_PCIX_533 /* F */
475 static unsigned char pcie_link_speed[] = {
476 PCI_SPEED_UNKNOWN, /* 0 */
477 PCIE_SPEED_2_5GT, /* 1 */
478 PCIE_SPEED_5_0GT, /* 2 */
479 PCIE_SPEED_8_0GT, /* 3 */
480 PCI_SPEED_UNKNOWN, /* 4 */
481 PCI_SPEED_UNKNOWN, /* 5 */
482 PCI_SPEED_UNKNOWN, /* 6 */
483 PCI_SPEED_UNKNOWN, /* 7 */
484 PCI_SPEED_UNKNOWN, /* 8 */
485 PCI_SPEED_UNKNOWN, /* 9 */
486 PCI_SPEED_UNKNOWN, /* A */
487 PCI_SPEED_UNKNOWN, /* B */
488 PCI_SPEED_UNKNOWN, /* C */
489 PCI_SPEED_UNKNOWN, /* D */
490 PCI_SPEED_UNKNOWN, /* E */
491 PCI_SPEED_UNKNOWN /* F */
494 void pcie_update_link_speed(struct pci_bus *bus, u16 linksta)
496 bus->cur_bus_speed = pcie_link_speed[linksta & 0xf];
498 EXPORT_SYMBOL_GPL(pcie_update_link_speed);
500 static unsigned char agp_speeds[] = {
508 static enum pci_bus_speed agp_speed(int agp3, int agpstat)
514 else if (agpstat & 2)
516 else if (agpstat & 1)
528 return agp_speeds[index];
532 static void pci_set_bus_speed(struct pci_bus *bus)
534 struct pci_dev *bridge = bus->self;
537 pos = pci_find_capability(bridge, PCI_CAP_ID_AGP);
539 pos = pci_find_capability(bridge, PCI_CAP_ID_AGP3);
543 pci_read_config_dword(bridge, pos + PCI_AGP_STATUS, &agpstat);
544 bus->max_bus_speed = agp_speed(agpstat & 8, agpstat & 7);
546 pci_read_config_dword(bridge, pos + PCI_AGP_COMMAND, &agpcmd);
547 bus->cur_bus_speed = agp_speed(agpstat & 8, agpcmd & 7);
550 pos = pci_find_capability(bridge, PCI_CAP_ID_PCIX);
553 enum pci_bus_speed max;
554 pci_read_config_word(bridge, pos + 2, &status);
556 if (status & 0x8000) {
557 max = PCI_SPEED_133MHz_PCIX_533;
558 } else if (status & 0x4000) {
559 max = PCI_SPEED_133MHz_PCIX_266;
560 } else if (status & 0x0002) {
561 if (((status >> 12) & 0x3) == 2) {
562 max = PCI_SPEED_133MHz_PCIX_ECC;
564 max = PCI_SPEED_133MHz_PCIX;
567 max = PCI_SPEED_66MHz_PCIX;
570 bus->max_bus_speed = max;
571 bus->cur_bus_speed = pcix_bus_speed[(status >> 6) & 0xf];
576 pos = pci_find_capability(bridge, PCI_CAP_ID_EXP);
581 pci_read_config_dword(bridge, pos + PCI_EXP_LNKCAP, &linkcap);
582 bus->max_bus_speed = pcie_link_speed[linkcap & 0xf];
584 pci_read_config_word(bridge, pos + PCI_EXP_LNKSTA, &linksta);
585 pcie_update_link_speed(bus, linksta);
590 static struct pci_bus *pci_alloc_child_bus(struct pci_bus *parent,
591 struct pci_dev *bridge, int busnr)
593 struct pci_bus *child;
597 * Allocate a new bus, and inherit stuff from the parent..
599 child = pci_alloc_bus();
603 child->parent = parent;
604 child->ops = parent->ops;
605 child->sysdata = parent->sysdata;
606 child->bus_flags = parent->bus_flags;
608 /* initialize some portions of the bus device, but don't register it
609 * now as the parent is not properly set up yet. This device will get
610 * registered later in pci_bus_add_devices()
612 child->dev.class = &pcibus_class;
613 dev_set_name(&child->dev, "%04x:%02x", pci_domain_nr(child), busnr);
616 * Set up the primary, secondary and subordinate
619 child->number = child->secondary = busnr;
620 child->primary = parent->secondary;
621 child->subordinate = 0xff;
626 child->self = bridge;
627 child->bridge = get_device(&bridge->dev);
629 pci_set_bus_speed(child);
631 /* Set up default resource pointers and names.. */
632 for (i = 0; i < PCI_BRIDGE_RESOURCE_NUM; i++) {
633 child->resource[i] = &bridge->resource[PCI_BRIDGE_RESOURCES+i];
634 child->resource[i]->name = child->name;
636 bridge->subordinate = child;
641 struct pci_bus *__ref pci_add_new_bus(struct pci_bus *parent, struct pci_dev *dev, int busnr)
643 struct pci_bus *child;
645 child = pci_alloc_child_bus(parent, dev, busnr);
647 down_write(&pci_bus_sem);
648 list_add_tail(&child->node, &parent->children);
649 up_write(&pci_bus_sem);
654 static void pci_fixup_parent_subordinate_busnr(struct pci_bus *child, int max)
656 struct pci_bus *parent = child->parent;
658 /* Attempts to fix that up are really dangerous unless
659 we're going to re-assign all bus numbers. */
660 if (!pcibios_assign_all_busses())
663 while (parent->parent && parent->subordinate < max) {
664 parent->subordinate = max;
665 pci_write_config_byte(parent->self, PCI_SUBORDINATE_BUS, max);
666 parent = parent->parent;
671 * If it's a bridge, configure it and scan the bus behind it.
672 * For CardBus bridges, we don't scan behind as the devices will
673 * be handled by the bridge driver itself.
675 * We need to process bridges in two passes -- first we scan those
676 * already configured by the BIOS and after we are done with all of
677 * them, we proceed to assigning numbers to the remaining buses in
678 * order to avoid overlaps between old and new bus numbers.
680 int __devinit pci_scan_bridge(struct pci_bus *bus, struct pci_dev *dev, int max, int pass)
682 struct pci_bus *child;
683 int is_cardbus = (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS);
686 u8 primary, secondary, subordinate;
689 pci_read_config_dword(dev, PCI_PRIMARY_BUS, &buses);
690 primary = buses & 0xFF;
691 secondary = (buses >> 8) & 0xFF;
692 subordinate = (buses >> 16) & 0xFF;
694 dev_dbg(&dev->dev, "scanning [bus %02x-%02x] behind bridge, pass %d\n",
695 secondary, subordinate, pass);
697 /* Check if setup is sensible at all */
699 (primary != bus->number || secondary <= bus->number)) {
700 dev_dbg(&dev->dev, "bus configuration invalid, reconfiguring\n");
704 /* Disable MasterAbortMode during probing to avoid reporting
705 of bus errors (in some architectures) */
706 pci_read_config_word(dev, PCI_BRIDGE_CONTROL, &bctl);
707 pci_write_config_word(dev, PCI_BRIDGE_CONTROL,
708 bctl & ~PCI_BRIDGE_CTL_MASTER_ABORT);
710 if ((secondary || subordinate) && !pcibios_assign_all_busses() &&
711 !is_cardbus && !broken) {
714 * Bus already configured by firmware, process it in the first
715 * pass and just note the configuration.
721 * If we already got to this bus through a different bridge,
722 * don't re-add it. This can happen with the i450NX chipset.
724 * However, we continue to descend down the hierarchy and
725 * scan remaining child buses.
727 child = pci_find_bus(pci_domain_nr(bus), secondary);
729 child = pci_add_new_bus(bus, dev, secondary);
732 child->primary = primary;
733 child->subordinate = subordinate;
734 child->bridge_ctl = bctl;
737 cmax = pci_scan_child_bus(child);
740 if (child->subordinate > max)
741 max = child->subordinate;
744 * We need to assign a number to this bus which we always
745 * do in the second pass.
748 if (pcibios_assign_all_busses() || broken)
749 /* Temporarily disable forwarding of the
750 configuration cycles on all bridges in
751 this bus segment to avoid possible
752 conflicts in the second pass between two
753 bridges programmed with overlapping
755 pci_write_config_dword(dev, PCI_PRIMARY_BUS,
761 pci_write_config_word(dev, PCI_STATUS, 0xffff);
763 /* Prevent assigning a bus number that already exists.
764 * This can happen when a bridge is hot-plugged */
765 if (pci_find_bus(pci_domain_nr(bus), max+1))
767 child = pci_add_new_bus(bus, dev, ++max);
770 buses = (buses & 0xff000000)
771 | ((unsigned int)(child->primary) << 0)
772 | ((unsigned int)(child->secondary) << 8)
773 | ((unsigned int)(child->subordinate) << 16);
776 * yenta.c forces a secondary latency timer of 176.
777 * Copy that behaviour here.
780 buses &= ~0xff000000;
781 buses |= CARDBUS_LATENCY_TIMER << 24;
785 * We need to blast all three values with a single write.
787 pci_write_config_dword(dev, PCI_PRIMARY_BUS, buses);
790 child->bridge_ctl = bctl;
792 * Adjust subordinate busnr in parent buses.
793 * We do this before scanning for children because
794 * some devices may not be detected if the bios
797 pci_fixup_parent_subordinate_busnr(child, max);
798 /* Now we can scan all subordinate buses... */
799 max = pci_scan_child_bus(child);
801 * now fix it up again since we have found
802 * the real value of max.
804 pci_fixup_parent_subordinate_busnr(child, max);
807 * For CardBus bridges, we leave 4 bus numbers
808 * as cards with a PCI-to-PCI bridge can be
811 for (i=0; i<CARDBUS_RESERVE_BUSNR; i++) {
812 struct pci_bus *parent = bus;
813 if (pci_find_bus(pci_domain_nr(bus),
816 while (parent->parent) {
817 if ((!pcibios_assign_all_busses()) &&
818 (parent->subordinate > max) &&
819 (parent->subordinate <= max+i)) {
822 parent = parent->parent;
826 * Often, there are two cardbus bridges
827 * -- try to leave one valid bus number
835 pci_fixup_parent_subordinate_busnr(child, max);
838 * Set the subordinate bus number to its real value.
840 child->subordinate = max;
841 pci_write_config_byte(dev, PCI_SUBORDINATE_BUS, max);
845 (is_cardbus ? "PCI CardBus %04x:%02x" : "PCI Bus %04x:%02x"),
846 pci_domain_nr(bus), child->number);
848 /* Has only triggered on CardBus, fixup is in yenta_socket */
849 while (bus->parent) {
850 if ((child->subordinate > bus->subordinate) ||
851 (child->number > bus->subordinate) ||
852 (child->number < bus->number) ||
853 (child->subordinate < bus->number)) {
854 dev_info(&child->dev, "[bus %02x-%02x] %s "
855 "hidden behind%s bridge %s [bus %02x-%02x]\n",
856 child->number, child->subordinate,
857 (bus->number > child->subordinate &&
858 bus->subordinate < child->number) ?
859 "wholly" : "partially",
860 bus->self->transparent ? " transparent" : "",
862 bus->number, bus->subordinate);
868 pci_write_config_word(dev, PCI_BRIDGE_CONTROL, bctl);
874 * Read interrupt line and base address registers.
875 * The architecture-dependent code can tweak these, of course.
877 static void pci_read_irq(struct pci_dev *dev)
881 pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &irq);
884 pci_read_config_byte(dev, PCI_INTERRUPT_LINE, &irq);
888 void set_pcie_port_type(struct pci_dev *pdev)
893 pos = pci_find_capability(pdev, PCI_CAP_ID_EXP);
897 pdev->pcie_cap = pos;
898 pci_read_config_word(pdev, pos + PCI_EXP_FLAGS, ®16);
899 pdev->pcie_type = (reg16 & PCI_EXP_FLAGS_TYPE) >> 4;
902 void set_pcie_hotplug_bridge(struct pci_dev *pdev)
908 pos = pci_pcie_cap(pdev);
911 pci_read_config_word(pdev, pos + PCI_EXP_FLAGS, ®16);
912 if (!(reg16 & PCI_EXP_FLAGS_SLOT))
914 pci_read_config_dword(pdev, pos + PCI_EXP_SLTCAP, ®32);
915 if (reg32 & PCI_EXP_SLTCAP_HPC)
916 pdev->is_hotplug_bridge = 1;
919 #define LEGACY_IO_RESOURCE (IORESOURCE_IO | IORESOURCE_PCI_FIXED)
922 * pci_setup_device - fill in class and map information of a device
923 * @dev: the device structure to fill
925 * Initialize the device structure with information about the device's
926 * vendor,class,memory and IO-space addresses,IRQ lines etc.
927 * Called at initialisation of the PCI subsystem and by CardBus services.
928 * Returns 0 on success and negative if unknown type of device (not normal,
929 * bridge or CardBus).
931 int pci_setup_device(struct pci_dev *dev)
935 struct pci_slot *slot;
938 if (pci_read_config_byte(dev, PCI_HEADER_TYPE, &hdr_type))
941 dev->sysdata = dev->bus->sysdata;
942 dev->dev.parent = dev->bus->bridge;
943 dev->dev.bus = &pci_bus_type;
944 dev->hdr_type = hdr_type & 0x7f;
945 dev->multifunction = !!(hdr_type & 0x80);
946 dev->error_state = pci_channel_io_normal;
947 set_pcie_port_type(dev);
949 list_for_each_entry(slot, &dev->bus->slots, list)
950 if (PCI_SLOT(dev->devfn) == slot->number)
953 /* Assume 32-bit PCI; let 64-bit PCI cards (which are far rarer)
954 set this higher, assuming the system even supports it. */
955 dev->dma_mask = 0xffffffff;
957 dev_set_name(&dev->dev, "%04x:%02x:%02x.%d", pci_domain_nr(dev->bus),
958 dev->bus->number, PCI_SLOT(dev->devfn),
959 PCI_FUNC(dev->devfn));
961 pci_read_config_dword(dev, PCI_CLASS_REVISION, &class);
962 dev->revision = class & 0xff;
963 class >>= 8; /* upper 3 bytes */
967 dev_printk(KERN_DEBUG, &dev->dev, "[%04x:%04x] type %d class %#08x\n",
968 dev->vendor, dev->device, dev->hdr_type, class);
970 /* need to have dev->class ready */
971 dev->cfg_size = pci_cfg_space_size(dev);
973 /* "Unknown power state" */
974 dev->current_state = PCI_UNKNOWN;
976 /* Early fixups, before probing the BARs */
977 pci_fixup_device(pci_fixup_early, dev);
978 /* device class may be changed after fixup */
979 class = dev->class >> 8;
981 switch (dev->hdr_type) { /* header type */
982 case PCI_HEADER_TYPE_NORMAL: /* standard header */
983 if (class == PCI_CLASS_BRIDGE_PCI)
986 pci_read_bases(dev, 6, PCI_ROM_ADDRESS);
987 pci_read_config_word(dev, PCI_SUBSYSTEM_VENDOR_ID, &dev->subsystem_vendor);
988 pci_read_config_word(dev, PCI_SUBSYSTEM_ID, &dev->subsystem_device);
991 * Do the ugly legacy mode stuff here rather than broken chip
992 * quirk code. Legacy mode ATA controllers have fixed
993 * addresses. These are not always echoed in BAR0-3, and
994 * BAR0-3 in a few cases contain junk!
996 if (class == PCI_CLASS_STORAGE_IDE) {
998 pci_read_config_byte(dev, PCI_CLASS_PROG, &progif);
999 if ((progif & 1) == 0) {
1000 dev->resource[0].start = 0x1F0;
1001 dev->resource[0].end = 0x1F7;
1002 dev->resource[0].flags = LEGACY_IO_RESOURCE;
1003 dev->resource[1].start = 0x3F6;
1004 dev->resource[1].end = 0x3F6;
1005 dev->resource[1].flags = LEGACY_IO_RESOURCE;
1007 if ((progif & 4) == 0) {
1008 dev->resource[2].start = 0x170;
1009 dev->resource[2].end = 0x177;
1010 dev->resource[2].flags = LEGACY_IO_RESOURCE;
1011 dev->resource[3].start = 0x376;
1012 dev->resource[3].end = 0x376;
1013 dev->resource[3].flags = LEGACY_IO_RESOURCE;
1018 case PCI_HEADER_TYPE_BRIDGE: /* bridge header */
1019 if (class != PCI_CLASS_BRIDGE_PCI)
1021 /* The PCI-to-PCI bridge spec requires that subtractive
1022 decoding (i.e. transparent) bridge must have programming
1023 interface code of 0x01. */
1025 dev->transparent = ((dev->class & 0xff) == 1);
1026 pci_read_bases(dev, 2, PCI_ROM_ADDRESS1);
1027 set_pcie_hotplug_bridge(dev);
1028 pos = pci_find_capability(dev, PCI_CAP_ID_SSVID);
1030 pci_read_config_word(dev, pos + PCI_SSVID_VENDOR_ID, &dev->subsystem_vendor);
1031 pci_read_config_word(dev, pos + PCI_SSVID_DEVICE_ID, &dev->subsystem_device);
1035 case PCI_HEADER_TYPE_CARDBUS: /* CardBus bridge header */
1036 if (class != PCI_CLASS_BRIDGE_CARDBUS)
1039 pci_read_bases(dev, 1, 0);
1040 pci_read_config_word(dev, PCI_CB_SUBSYSTEM_VENDOR_ID, &dev->subsystem_vendor);
1041 pci_read_config_word(dev, PCI_CB_SUBSYSTEM_ID, &dev->subsystem_device);
1044 default: /* unknown header */
1045 dev_err(&dev->dev, "unknown header type %02x, "
1046 "ignoring device\n", dev->hdr_type);
1050 dev_err(&dev->dev, "ignoring class %02x (doesn't match header "
1051 "type %02x)\n", class, dev->hdr_type);
1052 dev->class = PCI_CLASS_NOT_DEFINED;
1055 /* We found a fine healthy device, go go go... */
1059 static void pci_release_capabilities(struct pci_dev *dev)
1061 pci_vpd_release(dev);
1062 pci_iov_release(dev);
1066 * pci_release_dev - free a pci device structure when all users of it are finished.
1067 * @dev: device that's been disconnected
1069 * Will be called only by the device core when all users of this pci device are
1072 static void pci_release_dev(struct device *dev)
1074 struct pci_dev *pci_dev;
1076 pci_dev = to_pci_dev(dev);
1077 pci_release_capabilities(pci_dev);
1082 * pci_cfg_space_size - get the configuration space size of the PCI device.
1085 * Regular PCI devices have 256 bytes, but PCI-X 2 and PCI Express devices
1086 * have 4096 bytes. Even if the device is capable, that doesn't mean we can
1087 * access it. Maybe we don't have a way to generate extended config space
1088 * accesses, or the device is behind a reverse Express bridge. So we try
1089 * reading the dword at 0x100 which must either be 0 or a valid extended
1090 * capability header.
1092 int pci_cfg_space_size_ext(struct pci_dev *dev)
1095 int pos = PCI_CFG_SPACE_SIZE;
1097 if (pci_read_config_dword(dev, pos, &status) != PCIBIOS_SUCCESSFUL)
1099 if (status == 0xffffffff)
1102 return PCI_CFG_SPACE_EXP_SIZE;
1105 return PCI_CFG_SPACE_SIZE;
1108 int pci_cfg_space_size(struct pci_dev *dev)
1114 class = dev->class >> 8;
1115 if (class == PCI_CLASS_BRIDGE_HOST)
1116 return pci_cfg_space_size_ext(dev);
1118 pos = pci_pcie_cap(dev);
1120 pos = pci_find_capability(dev, PCI_CAP_ID_PCIX);
1124 pci_read_config_dword(dev, pos + PCI_X_STATUS, &status);
1125 if (!(status & (PCI_X_STATUS_266MHZ | PCI_X_STATUS_533MHZ)))
1129 return pci_cfg_space_size_ext(dev);
1132 return PCI_CFG_SPACE_SIZE;
1135 static void pci_release_bus_bridge_dev(struct device *dev)
1140 struct pci_dev *alloc_pci_dev(void)
1142 struct pci_dev *dev;
1144 dev = kzalloc(sizeof(struct pci_dev), GFP_KERNEL);
1148 INIT_LIST_HEAD(&dev->bus_list);
1152 EXPORT_SYMBOL(alloc_pci_dev);
1155 * Read the config data for a PCI device, sanity-check it
1156 * and fill in the dev structure...
1158 static struct pci_dev *pci_scan_device(struct pci_bus *bus, int devfn)
1160 struct pci_dev *dev;
1164 if (pci_bus_read_config_dword(bus, devfn, PCI_VENDOR_ID, &l))
1167 /* some broken boards return 0 or ~0 if a slot is empty: */
1168 if (l == 0xffffffff || l == 0x00000000 ||
1169 l == 0x0000ffff || l == 0xffff0000)
1172 /* Configuration request Retry Status */
1173 while (l == 0xffff0001) {
1176 if (pci_bus_read_config_dword(bus, devfn, PCI_VENDOR_ID, &l))
1178 /* Card hasn't responded in 60 seconds? Must be stuck. */
1179 if (delay > 60 * 1000) {
1180 printk(KERN_WARNING "pci %04x:%02x:%02x.%d: not "
1181 "responding\n", pci_domain_nr(bus),
1182 bus->number, PCI_SLOT(devfn),
1188 dev = alloc_pci_dev();
1194 dev->vendor = l & 0xffff;
1195 dev->device = (l >> 16) & 0xffff;
1197 if (pci_setup_device(dev)) {
1205 static void pci_init_capabilities(struct pci_dev *dev)
1207 /* MSI/MSI-X list */
1208 pci_msi_init_pci_dev(dev);
1210 /* Buffers for saving PCIe and PCI-X capabilities */
1211 pci_allocate_cap_save_buffers(dev);
1213 /* Power Management */
1215 platform_pci_wakeup_init(dev);
1217 /* Vital Product Data */
1218 pci_vpd_pci22_init(dev);
1220 /* Alternative Routing-ID Forwarding */
1221 pci_enable_ari(dev);
1223 /* Single Root I/O Virtualization */
1226 /* Enable ACS P2P upstream forwarding */
1227 pci_enable_acs(dev);
1230 void pci_device_add(struct pci_dev *dev, struct pci_bus *bus)
1232 device_initialize(&dev->dev);
1233 dev->dev.release = pci_release_dev;
1236 dev->dev.dma_mask = &dev->dma_mask;
1237 dev->dev.dma_parms = &dev->dma_parms;
1238 dev->dev.coherent_dma_mask = 0xffffffffull;
1240 pci_set_dma_max_seg_size(dev, 65536);
1241 pci_set_dma_seg_boundary(dev, 0xffffffff);
1243 /* Fix up broken headers */
1244 pci_fixup_device(pci_fixup_header, dev);
1246 /* Clear the state_saved flag. */
1247 dev->state_saved = false;
1249 /* Initialize various capabilities */
1250 pci_init_capabilities(dev);
1253 * Add the device to our list of discovered devices
1254 * and the bus list for fixup functions, etc.
1256 down_write(&pci_bus_sem);
1257 list_add_tail(&dev->bus_list, &bus->devices);
1258 up_write(&pci_bus_sem);
1261 struct pci_dev *__ref pci_scan_single_device(struct pci_bus *bus, int devfn)
1263 struct pci_dev *dev;
1265 dev = pci_get_slot(bus, devfn);
1271 dev = pci_scan_device(bus, devfn);
1275 pci_device_add(dev, bus);
1279 EXPORT_SYMBOL(pci_scan_single_device);
1281 static unsigned next_ari_fn(struct pci_dev *dev, unsigned fn)
1284 unsigned pos, next_fn;
1289 pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ARI);
1292 pci_read_config_word(dev, pos + 4, &cap);
1299 static unsigned next_trad_fn(struct pci_dev *dev, unsigned fn)
1301 return (fn + 1) % 8;
1304 static unsigned no_next_fn(struct pci_dev *dev, unsigned fn)
1309 static int only_one_child(struct pci_bus *bus)
1311 struct pci_dev *parent = bus->self;
1312 if (!parent || !pci_is_pcie(parent))
1314 if (parent->pcie_type == PCI_EXP_TYPE_ROOT_PORT ||
1315 parent->pcie_type == PCI_EXP_TYPE_DOWNSTREAM)
1321 * pci_scan_slot - scan a PCI slot on a bus for devices.
1322 * @bus: PCI bus to scan
1323 * @devfn: slot number to scan (must have zero function.)
1325 * Scan a PCI slot on the specified PCI bus for devices, adding
1326 * discovered devices to the @bus->devices list. New devices
1327 * will not have is_added set.
1329 * Returns the number of new devices found.
1331 int pci_scan_slot(struct pci_bus *bus, int devfn)
1333 unsigned fn, nr = 0;
1334 struct pci_dev *dev;
1335 unsigned (*next_fn)(struct pci_dev *, unsigned) = no_next_fn;
1337 if (only_one_child(bus) && (devfn > 0))
1338 return 0; /* Already scanned the entire slot */
1340 dev = pci_scan_single_device(bus, devfn);
1346 if (pci_ari_enabled(bus))
1347 next_fn = next_ari_fn;
1348 else if (dev->multifunction)
1349 next_fn = next_trad_fn;
1351 for (fn = next_fn(dev, 0); fn > 0; fn = next_fn(dev, fn)) {
1352 dev = pci_scan_single_device(bus, devfn + fn);
1356 dev->multifunction = 1;
1360 /* only one slot has pcie device */
1361 if (bus->self && nr)
1362 pcie_aspm_init_link_state(bus->self);
1367 unsigned int __devinit pci_scan_child_bus(struct pci_bus *bus)
1369 unsigned int devfn, pass, max = bus->secondary;
1370 struct pci_dev *dev;
1372 dev_dbg(&bus->dev, "scanning bus\n");
1374 /* Go find them, Rover! */
1375 for (devfn = 0; devfn < 0x100; devfn += 8)
1376 pci_scan_slot(bus, devfn);
1378 /* Reserve buses for SR-IOV capability. */
1379 max += pci_iov_bus_range(bus);
1382 * After performing arch-dependent fixup of the bus, look behind
1383 * all PCI-to-PCI bridges on this bus.
1385 if (!bus->is_added) {
1386 dev_dbg(&bus->dev, "fixups for bus\n");
1387 pcibios_fixup_bus(bus);
1388 if (pci_is_root_bus(bus))
1392 for (pass=0; pass < 2; pass++)
1393 list_for_each_entry(dev, &bus->devices, bus_list) {
1394 if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE ||
1395 dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)
1396 max = pci_scan_bridge(bus, dev, max, pass);
1400 * We've scanned the bus and so we know all about what's on
1401 * the other side of any bridges that may be on this bus plus
1404 * Return how far we've got finding sub-buses.
1406 dev_dbg(&bus->dev, "bus scan returning with max=%02x\n", max);
1410 struct pci_bus * pci_create_bus(struct device *parent,
1411 int bus, struct pci_ops *ops, void *sysdata)
1414 struct pci_bus *b, *b2;
1417 b = pci_alloc_bus();
1421 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
1427 b->sysdata = sysdata;
1430 b2 = pci_find_bus(pci_domain_nr(b), bus);
1432 /* If we already got to this bus through a different bridge, ignore it */
1433 dev_dbg(&b2->dev, "bus already known\n");
1437 down_write(&pci_bus_sem);
1438 list_add_tail(&b->node, &pci_root_buses);
1439 up_write(&pci_bus_sem);
1441 dev->parent = parent;
1442 dev->release = pci_release_bus_bridge_dev;
1443 dev_set_name(dev, "pci%04x:%02x", pci_domain_nr(b), bus);
1444 error = device_register(dev);
1447 b->bridge = get_device(dev);
1448 device_enable_async_suspend(b->bridge);
1451 set_dev_node(b->bridge, pcibus_to_node(b));
1453 b->dev.class = &pcibus_class;
1454 b->dev.parent = b->bridge;
1455 dev_set_name(&b->dev, "%04x:%02x", pci_domain_nr(b), bus);
1456 error = device_register(&b->dev);
1458 goto class_dev_reg_err;
1459 error = device_create_file(&b->dev, &dev_attr_cpuaffinity);
1461 goto dev_create_file_err;
1463 /* Create legacy_io and legacy_mem files for this bus */
1464 pci_create_legacy_files(b);
1466 b->number = b->secondary = bus;
1467 b->resource[0] = &ioport_resource;
1468 b->resource[1] = &iomem_resource;
1472 dev_create_file_err:
1473 device_unregister(&b->dev);
1475 device_unregister(dev);
1477 down_write(&pci_bus_sem);
1479 up_write(&pci_bus_sem);
1486 struct pci_bus * __devinit pci_scan_bus_parented(struct device *parent,
1487 int bus, struct pci_ops *ops, void *sysdata)
1491 b = pci_create_bus(parent, bus, ops, sysdata);
1493 b->subordinate = pci_scan_child_bus(b);
1496 EXPORT_SYMBOL(pci_scan_bus_parented);
1498 #ifdef CONFIG_HOTPLUG
1500 * pci_rescan_bus - scan a PCI bus for devices.
1501 * @bus: PCI bus to scan
1503 * Scan a PCI bus and child buses for new devices, adds them,
1506 * Returns the max number of subordinate bus discovered.
1508 unsigned int __ref pci_rescan_bus(struct pci_bus *bus)
1511 struct pci_dev *dev;
1513 max = pci_scan_child_bus(bus);
1515 down_read(&pci_bus_sem);
1516 list_for_each_entry(dev, &bus->devices, bus_list)
1517 if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE ||
1518 dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)
1519 if (dev->subordinate)
1520 pci_bus_size_bridges(dev->subordinate);
1521 up_read(&pci_bus_sem);
1523 pci_bus_assign_resources(bus);
1524 pci_enable_bridges(bus);
1525 pci_bus_add_devices(bus);
1529 EXPORT_SYMBOL_GPL(pci_rescan_bus);
1531 EXPORT_SYMBOL(pci_add_new_bus);
1532 EXPORT_SYMBOL(pci_scan_slot);
1533 EXPORT_SYMBOL(pci_scan_bridge);
1534 EXPORT_SYMBOL_GPL(pci_scan_child_bus);
1537 static int __init pci_sort_bf_cmp(const struct device *d_a, const struct device *d_b)
1539 const struct pci_dev *a = to_pci_dev(d_a);
1540 const struct pci_dev *b = to_pci_dev(d_b);
1542 if (pci_domain_nr(a->bus) < pci_domain_nr(b->bus)) return -1;
1543 else if (pci_domain_nr(a->bus) > pci_domain_nr(b->bus)) return 1;
1545 if (a->bus->number < b->bus->number) return -1;
1546 else if (a->bus->number > b->bus->number) return 1;
1548 if (a->devfn < b->devfn) return -1;
1549 else if (a->devfn > b->devfn) return 1;
1554 void __init pci_sort_breadthfirst(void)
1556 bus_sort_breadthfirst(&pci_bus_type, &pci_sort_bf_cmp);