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);
48 static void release_pcibus_dev(struct device *dev)
50 struct pci_bus *pci_bus = to_pci_bus(dev);
53 put_device(pci_bus->bridge);
54 pci_bus_remove_resources(pci_bus);
58 static struct class pcibus_class = {
60 .dev_release = &release_pcibus_dev,
61 .dev_attrs = pcibus_dev_attrs,
64 static int __init pcibus_class_init(void)
66 return class_register(&pcibus_class);
68 postcore_initcall(pcibus_class_init);
71 * Translate the low bits of the PCI base
72 * to the resource type
74 static inline unsigned int pci_calc_resource_flags(unsigned int flags)
76 if (flags & PCI_BASE_ADDRESS_SPACE_IO)
79 if (flags & PCI_BASE_ADDRESS_MEM_PREFETCH)
80 return IORESOURCE_MEM | IORESOURCE_PREFETCH;
82 return IORESOURCE_MEM;
85 static u64 pci_size(u64 base, u64 maxbase, u64 mask)
87 u64 size = mask & maxbase; /* Find the significant bits */
91 /* Get the lowest of them to find the decode size, and
92 from that the extent. */
93 size = (size & ~(size-1)) - 1;
95 /* base == maxbase can be valid only if the BAR has
96 already been programmed with all 1s. */
97 if (base == maxbase && ((base | size) & mask) != mask)
103 static inline enum pci_bar_type decode_bar(struct pci_dev *dev,
104 struct resource *res, u32 bar)
108 if ((bar & PCI_BASE_ADDRESS_SPACE) == PCI_BASE_ADDRESS_SPACE_IO) {
109 res->flags = bar & ~PCI_BASE_ADDRESS_IO_MASK;
113 res->flags = bar & ~PCI_BASE_ADDRESS_MEM_MASK;
115 mem_type = bar & PCI_BASE_ADDRESS_MEM_TYPE_MASK;
117 case PCI_BASE_ADDRESS_MEM_TYPE_32:
119 case PCI_BASE_ADDRESS_MEM_TYPE_1M:
120 dev_info(&dev->dev, "1M mem BAR treated as 32-bit BAR\n");
122 case PCI_BASE_ADDRESS_MEM_TYPE_64:
123 return pci_bar_mem64;
126 "mem unknown type %x treated as 32-bit BAR\n",
130 return pci_bar_mem32;
134 * pci_read_base - read a PCI BAR
135 * @dev: the PCI device
136 * @type: type of the BAR
137 * @res: resource buffer to be filled in
138 * @pos: BAR position in the config space
140 * Returns 1 if the BAR is 64-bit, or 0 if 32-bit.
142 int __pci_read_base(struct pci_dev *dev, enum pci_bar_type type,
143 struct resource *res, unsigned int pos)
148 mask = type ? PCI_ROM_ADDRESS_MASK : ~0;
150 if (!dev->mmio_always_on) {
151 pci_read_config_word(dev, PCI_COMMAND, &orig_cmd);
152 pci_write_config_word(dev, PCI_COMMAND,
153 orig_cmd & ~(PCI_COMMAND_MEMORY | PCI_COMMAND_IO));
156 res->name = pci_name(dev);
158 pci_read_config_dword(dev, pos, &l);
159 pci_write_config_dword(dev, pos, l | mask);
160 pci_read_config_dword(dev, pos, &sz);
161 pci_write_config_dword(dev, pos, l);
163 if (!dev->mmio_always_on)
164 pci_write_config_word(dev, PCI_COMMAND, orig_cmd);
167 * All bits set in sz means the device isn't working properly.
168 * If the BAR isn't implemented, all bits must be 0. If it's a
169 * memory BAR or a ROM, bit 0 must be clear; if it's an io BAR, bit
172 if (!sz || sz == 0xffffffff)
176 * I don't know how l can have all bits set. Copied from old code.
177 * Maybe it fixes a bug on some ancient platform.
182 if (type == pci_bar_unknown) {
183 type = decode_bar(dev, res, l);
184 res->flags |= pci_calc_resource_flags(l) | IORESOURCE_SIZEALIGN;
185 if (type == pci_bar_io) {
186 l &= PCI_BASE_ADDRESS_IO_MASK;
187 mask = PCI_BASE_ADDRESS_IO_MASK & (u32) IO_SPACE_LIMIT;
189 l &= PCI_BASE_ADDRESS_MEM_MASK;
190 mask = (u32)PCI_BASE_ADDRESS_MEM_MASK;
193 res->flags |= (l & IORESOURCE_ROM_ENABLE);
194 l &= PCI_ROM_ADDRESS_MASK;
195 mask = (u32)PCI_ROM_ADDRESS_MASK;
198 if (type == pci_bar_mem64) {
201 u64 mask64 = mask | (u64)~0 << 32;
203 pci_read_config_dword(dev, pos + 4, &l);
204 pci_write_config_dword(dev, pos + 4, ~0);
205 pci_read_config_dword(dev, pos + 4, &sz);
206 pci_write_config_dword(dev, pos + 4, l);
208 l64 |= ((u64)l << 32);
209 sz64 |= ((u64)sz << 32);
211 sz64 = pci_size(l64, sz64, mask64);
216 if ((sizeof(resource_size_t) < 8) && (sz64 > 0x100000000ULL)) {
217 dev_err(&dev->dev, "reg %x: can't handle 64-bit BAR\n",
222 res->flags |= IORESOURCE_MEM_64;
223 if ((sizeof(resource_size_t) < 8) && l) {
224 /* Address above 32-bit boundary; disable the BAR */
225 pci_write_config_dword(dev, pos, 0);
226 pci_write_config_dword(dev, pos + 4, 0);
231 res->end = l64 + sz64;
232 dev_printk(KERN_DEBUG, &dev->dev, "reg %x: %pR\n",
236 sz = pci_size(l, sz, mask);
244 dev_printk(KERN_DEBUG, &dev->dev, "reg %x: %pR\n", pos, res);
248 return (type == pci_bar_mem64) ? 1 : 0;
254 static void pci_read_bases(struct pci_dev *dev, unsigned int howmany, int rom)
256 unsigned int pos, reg;
258 for (pos = 0; pos < howmany; pos++) {
259 struct resource *res = &dev->resource[pos];
260 reg = PCI_BASE_ADDRESS_0 + (pos << 2);
261 pos += __pci_read_base(dev, pci_bar_unknown, res, reg);
265 struct resource *res = &dev->resource[PCI_ROM_RESOURCE];
266 dev->rom_base_reg = rom;
267 res->flags = IORESOURCE_MEM | IORESOURCE_PREFETCH |
268 IORESOURCE_READONLY | IORESOURCE_CACHEABLE |
269 IORESOURCE_SIZEALIGN;
270 __pci_read_base(dev, pci_bar_mem32, res, rom);
274 static void __devinit pci_read_bridge_io(struct pci_bus *child)
276 struct pci_dev *dev = child->self;
277 u8 io_base_lo, io_limit_lo;
278 unsigned long base, limit;
279 struct resource *res;
281 res = child->resource[0];
282 pci_read_config_byte(dev, PCI_IO_BASE, &io_base_lo);
283 pci_read_config_byte(dev, PCI_IO_LIMIT, &io_limit_lo);
284 base = (io_base_lo & PCI_IO_RANGE_MASK) << 8;
285 limit = (io_limit_lo & PCI_IO_RANGE_MASK) << 8;
287 if ((io_base_lo & PCI_IO_RANGE_TYPE_MASK) == PCI_IO_RANGE_TYPE_32) {
288 u16 io_base_hi, io_limit_hi;
289 pci_read_config_word(dev, PCI_IO_BASE_UPPER16, &io_base_hi);
290 pci_read_config_word(dev, PCI_IO_LIMIT_UPPER16, &io_limit_hi);
291 base |= (io_base_hi << 16);
292 limit |= (io_limit_hi << 16);
295 if (base && base <= limit) {
296 res->flags = (io_base_lo & PCI_IO_RANGE_TYPE_MASK) | IORESOURCE_IO;
300 res->end = limit + 0xfff;
301 dev_printk(KERN_DEBUG, &dev->dev, " bridge window %pR\n", res);
303 dev_printk(KERN_DEBUG, &dev->dev,
304 " bridge window [io %#06lx-%#06lx] (disabled)\n",
309 static void __devinit pci_read_bridge_mmio(struct pci_bus *child)
311 struct pci_dev *dev = child->self;
312 u16 mem_base_lo, mem_limit_lo;
313 unsigned long base, limit;
314 struct resource *res;
316 res = child->resource[1];
317 pci_read_config_word(dev, PCI_MEMORY_BASE, &mem_base_lo);
318 pci_read_config_word(dev, PCI_MEMORY_LIMIT, &mem_limit_lo);
319 base = (mem_base_lo & PCI_MEMORY_RANGE_MASK) << 16;
320 limit = (mem_limit_lo & PCI_MEMORY_RANGE_MASK) << 16;
321 if (base && base <= limit) {
322 res->flags = (mem_base_lo & PCI_MEMORY_RANGE_TYPE_MASK) | IORESOURCE_MEM;
324 res->end = limit + 0xfffff;
325 dev_printk(KERN_DEBUG, &dev->dev, " bridge window %pR\n", res);
327 dev_printk(KERN_DEBUG, &dev->dev,
328 " bridge window [mem %#010lx-%#010lx] (disabled)\n",
329 base, limit + 0xfffff);
333 static void __devinit pci_read_bridge_mmio_pref(struct pci_bus *child)
335 struct pci_dev *dev = child->self;
336 u16 mem_base_lo, mem_limit_lo;
337 unsigned long base, limit;
338 struct resource *res;
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");
369 if (base && base <= limit) {
370 res->flags = (mem_base_lo & PCI_PREF_RANGE_TYPE_MASK) |
371 IORESOURCE_MEM | IORESOURCE_PREFETCH;
372 if (res->flags & PCI_PREF_RANGE_TYPE_64)
373 res->flags |= IORESOURCE_MEM_64;
375 res->end = limit + 0xfffff;
376 dev_printk(KERN_DEBUG, &dev->dev, " bridge window %pR\n", res);
378 dev_printk(KERN_DEBUG, &dev->dev,
379 " bridge window [mem %#010lx-%#010lx pref] (disabled)\n",
380 base, limit + 0xfffff);
384 void __devinit pci_read_bridge_bases(struct pci_bus *child)
386 struct pci_dev *dev = child->self;
387 struct resource *res;
390 if (pci_is_root_bus(child)) /* It's a host bus, nothing to read */
393 dev_info(&dev->dev, "PCI bridge to [bus %02x-%02x]%s\n",
394 child->secondary, child->subordinate,
395 dev->transparent ? " (subtractive decode)" : "");
397 pci_bus_remove_resources(child);
398 for (i = 0; i < PCI_BRIDGE_RESOURCE_NUM; i++)
399 child->resource[i] = &dev->resource[PCI_BRIDGE_RESOURCES+i];
401 pci_read_bridge_io(child);
402 pci_read_bridge_mmio(child);
403 pci_read_bridge_mmio_pref(child);
405 if (dev->transparent) {
406 pci_bus_for_each_resource(child->parent, res, i) {
408 pci_bus_add_resource(child, res,
409 PCI_SUBTRACTIVE_DECODE);
410 dev_printk(KERN_DEBUG, &dev->dev,
411 " bridge window %pR (subtractive decode)\n",
418 static struct pci_bus * pci_alloc_bus(void)
422 b = kzalloc(sizeof(*b), GFP_KERNEL);
424 INIT_LIST_HEAD(&b->node);
425 INIT_LIST_HEAD(&b->children);
426 INIT_LIST_HEAD(&b->devices);
427 INIT_LIST_HEAD(&b->slots);
428 INIT_LIST_HEAD(&b->resources);
429 b->max_bus_speed = PCI_SPEED_UNKNOWN;
430 b->cur_bus_speed = PCI_SPEED_UNKNOWN;
435 static unsigned char pcix_bus_speed[] = {
436 PCI_SPEED_UNKNOWN, /* 0 */
437 PCI_SPEED_66MHz_PCIX, /* 1 */
438 PCI_SPEED_100MHz_PCIX, /* 2 */
439 PCI_SPEED_133MHz_PCIX, /* 3 */
440 PCI_SPEED_UNKNOWN, /* 4 */
441 PCI_SPEED_66MHz_PCIX_ECC, /* 5 */
442 PCI_SPEED_100MHz_PCIX_ECC, /* 6 */
443 PCI_SPEED_133MHz_PCIX_ECC, /* 7 */
444 PCI_SPEED_UNKNOWN, /* 8 */
445 PCI_SPEED_66MHz_PCIX_266, /* 9 */
446 PCI_SPEED_100MHz_PCIX_266, /* A */
447 PCI_SPEED_133MHz_PCIX_266, /* B */
448 PCI_SPEED_UNKNOWN, /* C */
449 PCI_SPEED_66MHz_PCIX_533, /* D */
450 PCI_SPEED_100MHz_PCIX_533, /* E */
451 PCI_SPEED_133MHz_PCIX_533 /* F */
454 static unsigned char pcie_link_speed[] = {
455 PCI_SPEED_UNKNOWN, /* 0 */
456 PCIE_SPEED_2_5GT, /* 1 */
457 PCIE_SPEED_5_0GT, /* 2 */
458 PCIE_SPEED_8_0GT, /* 3 */
459 PCI_SPEED_UNKNOWN, /* 4 */
460 PCI_SPEED_UNKNOWN, /* 5 */
461 PCI_SPEED_UNKNOWN, /* 6 */
462 PCI_SPEED_UNKNOWN, /* 7 */
463 PCI_SPEED_UNKNOWN, /* 8 */
464 PCI_SPEED_UNKNOWN, /* 9 */
465 PCI_SPEED_UNKNOWN, /* A */
466 PCI_SPEED_UNKNOWN, /* B */
467 PCI_SPEED_UNKNOWN, /* C */
468 PCI_SPEED_UNKNOWN, /* D */
469 PCI_SPEED_UNKNOWN, /* E */
470 PCI_SPEED_UNKNOWN /* F */
473 void pcie_update_link_speed(struct pci_bus *bus, u16 linksta)
475 bus->cur_bus_speed = pcie_link_speed[linksta & 0xf];
477 EXPORT_SYMBOL_GPL(pcie_update_link_speed);
479 static unsigned char agp_speeds[] = {
487 static enum pci_bus_speed agp_speed(int agp3, int agpstat)
493 else if (agpstat & 2)
495 else if (agpstat & 1)
507 return agp_speeds[index];
511 static void pci_set_bus_speed(struct pci_bus *bus)
513 struct pci_dev *bridge = bus->self;
516 pos = pci_find_capability(bridge, PCI_CAP_ID_AGP);
518 pos = pci_find_capability(bridge, PCI_CAP_ID_AGP3);
522 pci_read_config_dword(bridge, pos + PCI_AGP_STATUS, &agpstat);
523 bus->max_bus_speed = agp_speed(agpstat & 8, agpstat & 7);
525 pci_read_config_dword(bridge, pos + PCI_AGP_COMMAND, &agpcmd);
526 bus->cur_bus_speed = agp_speed(agpstat & 8, agpcmd & 7);
529 pos = pci_find_capability(bridge, PCI_CAP_ID_PCIX);
532 enum pci_bus_speed max;
533 pci_read_config_word(bridge, pos + 2, &status);
535 if (status & 0x8000) {
536 max = PCI_SPEED_133MHz_PCIX_533;
537 } else if (status & 0x4000) {
538 max = PCI_SPEED_133MHz_PCIX_266;
539 } else if (status & 0x0002) {
540 if (((status >> 12) & 0x3) == 2) {
541 max = PCI_SPEED_133MHz_PCIX_ECC;
543 max = PCI_SPEED_133MHz_PCIX;
546 max = PCI_SPEED_66MHz_PCIX;
549 bus->max_bus_speed = max;
550 bus->cur_bus_speed = pcix_bus_speed[(status >> 6) & 0xf];
555 pos = pci_find_capability(bridge, PCI_CAP_ID_EXP);
560 pci_read_config_dword(bridge, pos + PCI_EXP_LNKCAP, &linkcap);
561 bus->max_bus_speed = pcie_link_speed[linkcap & 0xf];
563 pci_read_config_word(bridge, pos + PCI_EXP_LNKSTA, &linksta);
564 pcie_update_link_speed(bus, linksta);
569 static struct pci_bus *pci_alloc_child_bus(struct pci_bus *parent,
570 struct pci_dev *bridge, int busnr)
572 struct pci_bus *child;
576 * Allocate a new bus, and inherit stuff from the parent..
578 child = pci_alloc_bus();
582 child->parent = parent;
583 child->ops = parent->ops;
584 child->sysdata = parent->sysdata;
585 child->bus_flags = parent->bus_flags;
587 /* initialize some portions of the bus device, but don't register it
588 * now as the parent is not properly set up yet. This device will get
589 * registered later in pci_bus_add_devices()
591 child->dev.class = &pcibus_class;
592 dev_set_name(&child->dev, "%04x:%02x", pci_domain_nr(child), busnr);
595 * Set up the primary, secondary and subordinate
598 child->number = child->secondary = busnr;
599 child->primary = parent->secondary;
600 child->subordinate = 0xff;
605 child->self = bridge;
606 child->bridge = get_device(&bridge->dev);
608 pci_set_bus_speed(child);
610 /* Set up default resource pointers and names.. */
611 for (i = 0; i < PCI_BRIDGE_RESOURCE_NUM; i++) {
612 child->resource[i] = &bridge->resource[PCI_BRIDGE_RESOURCES+i];
613 child->resource[i]->name = child->name;
615 bridge->subordinate = child;
620 struct pci_bus *__ref pci_add_new_bus(struct pci_bus *parent, struct pci_dev *dev, int busnr)
622 struct pci_bus *child;
624 child = pci_alloc_child_bus(parent, dev, busnr);
626 down_write(&pci_bus_sem);
627 list_add_tail(&child->node, &parent->children);
628 up_write(&pci_bus_sem);
633 static void pci_fixup_parent_subordinate_busnr(struct pci_bus *child, int max)
635 struct pci_bus *parent = child->parent;
637 /* Attempts to fix that up are really dangerous unless
638 we're going to re-assign all bus numbers. */
639 if (!pcibios_assign_all_busses())
642 while (parent->parent && parent->subordinate < max) {
643 parent->subordinate = max;
644 pci_write_config_byte(parent->self, PCI_SUBORDINATE_BUS, max);
645 parent = parent->parent;
650 * If it's a bridge, configure it and scan the bus behind it.
651 * For CardBus bridges, we don't scan behind as the devices will
652 * be handled by the bridge driver itself.
654 * We need to process bridges in two passes -- first we scan those
655 * already configured by the BIOS and after we are done with all of
656 * them, we proceed to assigning numbers to the remaining buses in
657 * order to avoid overlaps between old and new bus numbers.
659 int __devinit pci_scan_bridge(struct pci_bus *bus, struct pci_dev *dev, int max, int pass)
661 struct pci_bus *child;
662 int is_cardbus = (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS);
665 u8 primary, secondary, subordinate;
668 pci_read_config_dword(dev, PCI_PRIMARY_BUS, &buses);
669 primary = buses & 0xFF;
670 secondary = (buses >> 8) & 0xFF;
671 subordinate = (buses >> 16) & 0xFF;
673 dev_dbg(&dev->dev, "scanning [bus %02x-%02x] behind bridge, pass %d\n",
674 secondary, subordinate, pass);
676 /* Check if setup is sensible at all */
678 (primary != bus->number || secondary <= bus->number)) {
679 dev_dbg(&dev->dev, "bus configuration invalid, reconfiguring\n");
683 /* Disable MasterAbortMode during probing to avoid reporting
684 of bus errors (in some architectures) */
685 pci_read_config_word(dev, PCI_BRIDGE_CONTROL, &bctl);
686 pci_write_config_word(dev, PCI_BRIDGE_CONTROL,
687 bctl & ~PCI_BRIDGE_CTL_MASTER_ABORT);
689 if ((secondary || subordinate) && !pcibios_assign_all_busses() &&
690 !is_cardbus && !broken) {
693 * Bus already configured by firmware, process it in the first
694 * pass and just note the configuration.
700 * If we already got to this bus through a different bridge,
701 * don't re-add it. This can happen with the i450NX chipset.
703 * However, we continue to descend down the hierarchy and
704 * scan remaining child buses.
706 child = pci_find_bus(pci_domain_nr(bus), secondary);
708 child = pci_add_new_bus(bus, dev, secondary);
711 child->primary = primary;
712 child->subordinate = subordinate;
713 child->bridge_ctl = bctl;
716 cmax = pci_scan_child_bus(child);
719 if (child->subordinate > max)
720 max = child->subordinate;
723 * We need to assign a number to this bus which we always
724 * do in the second pass.
727 if (pcibios_assign_all_busses() || broken)
728 /* Temporarily disable forwarding of the
729 configuration cycles on all bridges in
730 this bus segment to avoid possible
731 conflicts in the second pass between two
732 bridges programmed with overlapping
734 pci_write_config_dword(dev, PCI_PRIMARY_BUS,
740 pci_write_config_word(dev, PCI_STATUS, 0xffff);
742 /* Prevent assigning a bus number that already exists.
743 * This can happen when a bridge is hot-plugged, so in
744 * this case we only re-scan this bus. */
745 child = pci_find_bus(pci_domain_nr(bus), max+1);
747 child = pci_add_new_bus(bus, dev, ++max);
751 buses = (buses & 0xff000000)
752 | ((unsigned int)(child->primary) << 0)
753 | ((unsigned int)(child->secondary) << 8)
754 | ((unsigned int)(child->subordinate) << 16);
757 * yenta.c forces a secondary latency timer of 176.
758 * Copy that behaviour here.
761 buses &= ~0xff000000;
762 buses |= CARDBUS_LATENCY_TIMER << 24;
766 * We need to blast all three values with a single write.
768 pci_write_config_dword(dev, PCI_PRIMARY_BUS, buses);
771 child->bridge_ctl = bctl;
773 * Adjust subordinate busnr in parent buses.
774 * We do this before scanning for children because
775 * some devices may not be detected if the bios
778 pci_fixup_parent_subordinate_busnr(child, max);
779 /* Now we can scan all subordinate buses... */
780 max = pci_scan_child_bus(child);
782 * now fix it up again since we have found
783 * the real value of max.
785 pci_fixup_parent_subordinate_busnr(child, max);
788 * For CardBus bridges, we leave 4 bus numbers
789 * as cards with a PCI-to-PCI bridge can be
792 for (i=0; i<CARDBUS_RESERVE_BUSNR; i++) {
793 struct pci_bus *parent = bus;
794 if (pci_find_bus(pci_domain_nr(bus),
797 while (parent->parent) {
798 if ((!pcibios_assign_all_busses()) &&
799 (parent->subordinate > max) &&
800 (parent->subordinate <= max+i)) {
803 parent = parent->parent;
807 * Often, there are two cardbus bridges
808 * -- try to leave one valid bus number
816 pci_fixup_parent_subordinate_busnr(child, max);
819 * Set the subordinate bus number to its real value.
821 child->subordinate = max;
822 pci_write_config_byte(dev, PCI_SUBORDINATE_BUS, max);
826 (is_cardbus ? "PCI CardBus %04x:%02x" : "PCI Bus %04x:%02x"),
827 pci_domain_nr(bus), child->number);
829 /* Has only triggered on CardBus, fixup is in yenta_socket */
830 while (bus->parent) {
831 if ((child->subordinate > bus->subordinate) ||
832 (child->number > bus->subordinate) ||
833 (child->number < bus->number) ||
834 (child->subordinate < bus->number)) {
835 dev_info(&child->dev, "[bus %02x-%02x] %s "
836 "hidden behind%s bridge %s [bus %02x-%02x]\n",
837 child->number, child->subordinate,
838 (bus->number > child->subordinate &&
839 bus->subordinate < child->number) ?
840 "wholly" : "partially",
841 bus->self->transparent ? " transparent" : "",
843 bus->number, bus->subordinate);
849 pci_write_config_word(dev, PCI_BRIDGE_CONTROL, bctl);
855 * Read interrupt line and base address registers.
856 * The architecture-dependent code can tweak these, of course.
858 static void pci_read_irq(struct pci_dev *dev)
862 pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &irq);
865 pci_read_config_byte(dev, PCI_INTERRUPT_LINE, &irq);
869 void set_pcie_port_type(struct pci_dev *pdev)
874 pos = pci_find_capability(pdev, PCI_CAP_ID_EXP);
878 pdev->pcie_cap = pos;
879 pci_read_config_word(pdev, pos + PCI_EXP_FLAGS, ®16);
880 pdev->pcie_type = (reg16 & PCI_EXP_FLAGS_TYPE) >> 4;
883 void set_pcie_hotplug_bridge(struct pci_dev *pdev)
889 pos = pci_pcie_cap(pdev);
892 pci_read_config_word(pdev, pos + PCI_EXP_FLAGS, ®16);
893 if (!(reg16 & PCI_EXP_FLAGS_SLOT))
895 pci_read_config_dword(pdev, pos + PCI_EXP_SLTCAP, ®32);
896 if (reg32 & PCI_EXP_SLTCAP_HPC)
897 pdev->is_hotplug_bridge = 1;
900 #define LEGACY_IO_RESOURCE (IORESOURCE_IO | IORESOURCE_PCI_FIXED)
903 * pci_setup_device - fill in class and map information of a device
904 * @dev: the device structure to fill
906 * Initialize the device structure with information about the device's
907 * vendor,class,memory and IO-space addresses,IRQ lines etc.
908 * Called at initialisation of the PCI subsystem and by CardBus services.
909 * Returns 0 on success and negative if unknown type of device (not normal,
910 * bridge or CardBus).
912 int pci_setup_device(struct pci_dev *dev)
916 struct pci_slot *slot;
919 if (pci_read_config_byte(dev, PCI_HEADER_TYPE, &hdr_type))
922 dev->sysdata = dev->bus->sysdata;
923 dev->dev.parent = dev->bus->bridge;
924 dev->dev.bus = &pci_bus_type;
925 dev->hdr_type = hdr_type & 0x7f;
926 dev->multifunction = !!(hdr_type & 0x80);
927 dev->error_state = pci_channel_io_normal;
928 set_pcie_port_type(dev);
930 list_for_each_entry(slot, &dev->bus->slots, list)
931 if (PCI_SLOT(dev->devfn) == slot->number)
934 /* Assume 32-bit PCI; let 64-bit PCI cards (which are far rarer)
935 set this higher, assuming the system even supports it. */
936 dev->dma_mask = 0xffffffff;
938 dev_set_name(&dev->dev, "%04x:%02x:%02x.%d", pci_domain_nr(dev->bus),
939 dev->bus->number, PCI_SLOT(dev->devfn),
940 PCI_FUNC(dev->devfn));
942 pci_read_config_dword(dev, PCI_CLASS_REVISION, &class);
943 dev->revision = class & 0xff;
944 class >>= 8; /* upper 3 bytes */
948 dev_printk(KERN_DEBUG, &dev->dev, "[%04x:%04x] type %d class %#08x\n",
949 dev->vendor, dev->device, dev->hdr_type, class);
951 /* need to have dev->class ready */
952 dev->cfg_size = pci_cfg_space_size(dev);
954 /* "Unknown power state" */
955 dev->current_state = PCI_UNKNOWN;
957 /* Early fixups, before probing the BARs */
958 pci_fixup_device(pci_fixup_early, dev);
959 /* device class may be changed after fixup */
960 class = dev->class >> 8;
962 switch (dev->hdr_type) { /* header type */
963 case PCI_HEADER_TYPE_NORMAL: /* standard header */
964 if (class == PCI_CLASS_BRIDGE_PCI)
967 pci_read_bases(dev, 6, PCI_ROM_ADDRESS);
968 pci_read_config_word(dev, PCI_SUBSYSTEM_VENDOR_ID, &dev->subsystem_vendor);
969 pci_read_config_word(dev, PCI_SUBSYSTEM_ID, &dev->subsystem_device);
972 * Do the ugly legacy mode stuff here rather than broken chip
973 * quirk code. Legacy mode ATA controllers have fixed
974 * addresses. These are not always echoed in BAR0-3, and
975 * BAR0-3 in a few cases contain junk!
977 if (class == PCI_CLASS_STORAGE_IDE) {
979 pci_read_config_byte(dev, PCI_CLASS_PROG, &progif);
980 if ((progif & 1) == 0) {
981 dev->resource[0].start = 0x1F0;
982 dev->resource[0].end = 0x1F7;
983 dev->resource[0].flags = LEGACY_IO_RESOURCE;
984 dev->resource[1].start = 0x3F6;
985 dev->resource[1].end = 0x3F6;
986 dev->resource[1].flags = LEGACY_IO_RESOURCE;
988 if ((progif & 4) == 0) {
989 dev->resource[2].start = 0x170;
990 dev->resource[2].end = 0x177;
991 dev->resource[2].flags = LEGACY_IO_RESOURCE;
992 dev->resource[3].start = 0x376;
993 dev->resource[3].end = 0x376;
994 dev->resource[3].flags = LEGACY_IO_RESOURCE;
999 case PCI_HEADER_TYPE_BRIDGE: /* bridge header */
1000 if (class != PCI_CLASS_BRIDGE_PCI)
1002 /* The PCI-to-PCI bridge spec requires that subtractive
1003 decoding (i.e. transparent) bridge must have programming
1004 interface code of 0x01. */
1006 dev->transparent = ((dev->class & 0xff) == 1);
1007 pci_read_bases(dev, 2, PCI_ROM_ADDRESS1);
1008 set_pcie_hotplug_bridge(dev);
1009 pos = pci_find_capability(dev, PCI_CAP_ID_SSVID);
1011 pci_read_config_word(dev, pos + PCI_SSVID_VENDOR_ID, &dev->subsystem_vendor);
1012 pci_read_config_word(dev, pos + PCI_SSVID_DEVICE_ID, &dev->subsystem_device);
1016 case PCI_HEADER_TYPE_CARDBUS: /* CardBus bridge header */
1017 if (class != PCI_CLASS_BRIDGE_CARDBUS)
1020 pci_read_bases(dev, 1, 0);
1021 pci_read_config_word(dev, PCI_CB_SUBSYSTEM_VENDOR_ID, &dev->subsystem_vendor);
1022 pci_read_config_word(dev, PCI_CB_SUBSYSTEM_ID, &dev->subsystem_device);
1025 default: /* unknown header */
1026 dev_err(&dev->dev, "unknown header type %02x, "
1027 "ignoring device\n", dev->hdr_type);
1031 dev_err(&dev->dev, "ignoring class %02x (doesn't match header "
1032 "type %02x)\n", class, dev->hdr_type);
1033 dev->class = PCI_CLASS_NOT_DEFINED;
1036 /* We found a fine healthy device, go go go... */
1040 static void pci_release_capabilities(struct pci_dev *dev)
1042 pci_vpd_release(dev);
1043 pci_iov_release(dev);
1047 * pci_release_dev - free a pci device structure when all users of it are finished.
1048 * @dev: device that's been disconnected
1050 * Will be called only by the device core when all users of this pci device are
1053 static void pci_release_dev(struct device *dev)
1055 struct pci_dev *pci_dev;
1057 pci_dev = to_pci_dev(dev);
1058 pci_release_capabilities(pci_dev);
1063 * pci_cfg_space_size - get the configuration space size of the PCI device.
1066 * Regular PCI devices have 256 bytes, but PCI-X 2 and PCI Express devices
1067 * have 4096 bytes. Even if the device is capable, that doesn't mean we can
1068 * access it. Maybe we don't have a way to generate extended config space
1069 * accesses, or the device is behind a reverse Express bridge. So we try
1070 * reading the dword at 0x100 which must either be 0 or a valid extended
1071 * capability header.
1073 int pci_cfg_space_size_ext(struct pci_dev *dev)
1076 int pos = PCI_CFG_SPACE_SIZE;
1078 if (pci_read_config_dword(dev, pos, &status) != PCIBIOS_SUCCESSFUL)
1080 if (status == 0xffffffff)
1083 return PCI_CFG_SPACE_EXP_SIZE;
1086 return PCI_CFG_SPACE_SIZE;
1089 int pci_cfg_space_size(struct pci_dev *dev)
1095 class = dev->class >> 8;
1096 if (class == PCI_CLASS_BRIDGE_HOST)
1097 return pci_cfg_space_size_ext(dev);
1099 pos = pci_pcie_cap(dev);
1101 pos = pci_find_capability(dev, PCI_CAP_ID_PCIX);
1105 pci_read_config_dword(dev, pos + PCI_X_STATUS, &status);
1106 if (!(status & (PCI_X_STATUS_266MHZ | PCI_X_STATUS_533MHZ)))
1110 return pci_cfg_space_size_ext(dev);
1113 return PCI_CFG_SPACE_SIZE;
1116 static void pci_release_bus_bridge_dev(struct device *dev)
1121 struct pci_dev *alloc_pci_dev(void)
1123 struct pci_dev *dev;
1125 dev = kzalloc(sizeof(struct pci_dev), GFP_KERNEL);
1129 INIT_LIST_HEAD(&dev->bus_list);
1133 EXPORT_SYMBOL(alloc_pci_dev);
1136 * Read the config data for a PCI device, sanity-check it
1137 * and fill in the dev structure...
1139 static struct pci_dev *pci_scan_device(struct pci_bus *bus, int devfn)
1141 struct pci_dev *dev;
1145 if (pci_bus_read_config_dword(bus, devfn, PCI_VENDOR_ID, &l))
1148 /* some broken boards return 0 or ~0 if a slot is empty: */
1149 if (l == 0xffffffff || l == 0x00000000 ||
1150 l == 0x0000ffff || l == 0xffff0000)
1153 /* Configuration request Retry Status */
1154 while (l == 0xffff0001) {
1157 if (pci_bus_read_config_dword(bus, devfn, PCI_VENDOR_ID, &l))
1159 /* Card hasn't responded in 60 seconds? Must be stuck. */
1160 if (delay > 60 * 1000) {
1161 printk(KERN_WARNING "pci %04x:%02x:%02x.%d: not "
1162 "responding\n", pci_domain_nr(bus),
1163 bus->number, PCI_SLOT(devfn),
1169 dev = alloc_pci_dev();
1175 dev->vendor = l & 0xffff;
1176 dev->device = (l >> 16) & 0xffff;
1178 if (pci_setup_device(dev)) {
1186 static void pci_init_capabilities(struct pci_dev *dev)
1188 /* MSI/MSI-X list */
1189 pci_msi_init_pci_dev(dev);
1191 /* Buffers for saving PCIe and PCI-X capabilities */
1192 pci_allocate_cap_save_buffers(dev);
1194 /* Power Management */
1196 platform_pci_wakeup_init(dev);
1198 /* Vital Product Data */
1199 pci_vpd_pci22_init(dev);
1201 /* Alternative Routing-ID Forwarding */
1202 pci_enable_ari(dev);
1204 /* Single Root I/O Virtualization */
1207 /* Enable ACS P2P upstream forwarding */
1208 pci_enable_acs(dev);
1211 void pci_device_add(struct pci_dev *dev, struct pci_bus *bus)
1213 device_initialize(&dev->dev);
1214 dev->dev.release = pci_release_dev;
1217 dev->dev.dma_mask = &dev->dma_mask;
1218 dev->dev.dma_parms = &dev->dma_parms;
1219 dev->dev.coherent_dma_mask = 0xffffffffull;
1221 pci_set_dma_max_seg_size(dev, 65536);
1222 pci_set_dma_seg_boundary(dev, 0xffffffff);
1224 /* Fix up broken headers */
1225 pci_fixup_device(pci_fixup_header, dev);
1227 /* Clear the state_saved flag. */
1228 dev->state_saved = false;
1230 /* Initialize various capabilities */
1231 pci_init_capabilities(dev);
1234 * Add the device to our list of discovered devices
1235 * and the bus list for fixup functions, etc.
1237 down_write(&pci_bus_sem);
1238 list_add_tail(&dev->bus_list, &bus->devices);
1239 up_write(&pci_bus_sem);
1242 struct pci_dev *__ref pci_scan_single_device(struct pci_bus *bus, int devfn)
1244 struct pci_dev *dev;
1246 dev = pci_get_slot(bus, devfn);
1252 dev = pci_scan_device(bus, devfn);
1256 pci_device_add(dev, bus);
1260 EXPORT_SYMBOL(pci_scan_single_device);
1262 static unsigned next_ari_fn(struct pci_dev *dev, unsigned fn)
1265 unsigned pos, next_fn;
1270 pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ARI);
1273 pci_read_config_word(dev, pos + 4, &cap);
1280 static unsigned next_trad_fn(struct pci_dev *dev, unsigned fn)
1282 return (fn + 1) % 8;
1285 static unsigned no_next_fn(struct pci_dev *dev, unsigned fn)
1290 static int only_one_child(struct pci_bus *bus)
1292 struct pci_dev *parent = bus->self;
1293 if (!parent || !pci_is_pcie(parent))
1295 if (parent->pcie_type == PCI_EXP_TYPE_ROOT_PORT ||
1296 parent->pcie_type == PCI_EXP_TYPE_DOWNSTREAM)
1302 * pci_scan_slot - scan a PCI slot on a bus for devices.
1303 * @bus: PCI bus to scan
1304 * @devfn: slot number to scan (must have zero function.)
1306 * Scan a PCI slot on the specified PCI bus for devices, adding
1307 * discovered devices to the @bus->devices list. New devices
1308 * will not have is_added set.
1310 * Returns the number of new devices found.
1312 int pci_scan_slot(struct pci_bus *bus, int devfn)
1314 unsigned fn, nr = 0;
1315 struct pci_dev *dev;
1316 unsigned (*next_fn)(struct pci_dev *, unsigned) = no_next_fn;
1318 if (only_one_child(bus) && (devfn > 0))
1319 return 0; /* Already scanned the entire slot */
1321 dev = pci_scan_single_device(bus, devfn);
1327 if (pci_ari_enabled(bus))
1328 next_fn = next_ari_fn;
1329 else if (dev->multifunction)
1330 next_fn = next_trad_fn;
1332 for (fn = next_fn(dev, 0); fn > 0; fn = next_fn(dev, fn)) {
1333 dev = pci_scan_single_device(bus, devfn + fn);
1337 dev->multifunction = 1;
1341 /* only one slot has pcie device */
1342 if (bus->self && nr)
1343 pcie_aspm_init_link_state(bus->self);
1348 unsigned int __devinit pci_scan_child_bus(struct pci_bus *bus)
1350 unsigned int devfn, pass, max = bus->secondary;
1351 struct pci_dev *dev;
1353 dev_dbg(&bus->dev, "scanning bus\n");
1355 /* Go find them, Rover! */
1356 for (devfn = 0; devfn < 0x100; devfn += 8)
1357 pci_scan_slot(bus, devfn);
1359 /* Reserve buses for SR-IOV capability. */
1360 max += pci_iov_bus_range(bus);
1363 * After performing arch-dependent fixup of the bus, look behind
1364 * all PCI-to-PCI bridges on this bus.
1366 if (!bus->is_added) {
1367 dev_dbg(&bus->dev, "fixups for bus\n");
1368 pcibios_fixup_bus(bus);
1369 if (pci_is_root_bus(bus))
1373 for (pass=0; pass < 2; pass++)
1374 list_for_each_entry(dev, &bus->devices, bus_list) {
1375 if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE ||
1376 dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)
1377 max = pci_scan_bridge(bus, dev, max, pass);
1381 * We've scanned the bus and so we know all about what's on
1382 * the other side of any bridges that may be on this bus plus
1385 * Return how far we've got finding sub-buses.
1387 dev_dbg(&bus->dev, "bus scan returning with max=%02x\n", max);
1391 struct pci_bus * pci_create_bus(struct device *parent,
1392 int bus, struct pci_ops *ops, void *sysdata)
1395 struct pci_bus *b, *b2;
1398 b = pci_alloc_bus();
1402 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
1408 b->sysdata = sysdata;
1411 b2 = pci_find_bus(pci_domain_nr(b), bus);
1413 /* If we already got to this bus through a different bridge, ignore it */
1414 dev_dbg(&b2->dev, "bus already known\n");
1418 down_write(&pci_bus_sem);
1419 list_add_tail(&b->node, &pci_root_buses);
1420 up_write(&pci_bus_sem);
1422 dev->parent = parent;
1423 dev->release = pci_release_bus_bridge_dev;
1424 dev_set_name(dev, "pci%04x:%02x", pci_domain_nr(b), bus);
1425 error = device_register(dev);
1428 b->bridge = get_device(dev);
1429 device_enable_async_suspend(b->bridge);
1432 set_dev_node(b->bridge, pcibus_to_node(b));
1434 b->dev.class = &pcibus_class;
1435 b->dev.parent = b->bridge;
1436 dev_set_name(&b->dev, "%04x:%02x", pci_domain_nr(b), bus);
1437 error = device_register(&b->dev);
1439 goto class_dev_reg_err;
1441 /* Create legacy_io and legacy_mem files for this bus */
1442 pci_create_legacy_files(b);
1444 b->number = b->secondary = bus;
1445 b->resource[0] = &ioport_resource;
1446 b->resource[1] = &iomem_resource;
1451 device_unregister(dev);
1453 down_write(&pci_bus_sem);
1455 up_write(&pci_bus_sem);
1462 struct pci_bus * __devinit pci_scan_bus_parented(struct device *parent,
1463 int bus, struct pci_ops *ops, void *sysdata)
1467 b = pci_create_bus(parent, bus, ops, sysdata);
1469 b->subordinate = pci_scan_child_bus(b);
1472 EXPORT_SYMBOL(pci_scan_bus_parented);
1474 #ifdef CONFIG_HOTPLUG
1476 * pci_rescan_bus - scan a PCI bus for devices.
1477 * @bus: PCI bus to scan
1479 * Scan a PCI bus and child buses for new devices, adds them,
1482 * Returns the max number of subordinate bus discovered.
1484 unsigned int __ref pci_rescan_bus(struct pci_bus *bus)
1487 struct pci_dev *dev;
1489 max = pci_scan_child_bus(bus);
1491 down_read(&pci_bus_sem);
1492 list_for_each_entry(dev, &bus->devices, bus_list)
1493 if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE ||
1494 dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)
1495 if (dev->subordinate)
1496 pci_bus_size_bridges(dev->subordinate);
1497 up_read(&pci_bus_sem);
1499 pci_bus_assign_resources(bus);
1500 pci_enable_bridges(bus);
1501 pci_bus_add_devices(bus);
1505 EXPORT_SYMBOL_GPL(pci_rescan_bus);
1507 EXPORT_SYMBOL(pci_add_new_bus);
1508 EXPORT_SYMBOL(pci_scan_slot);
1509 EXPORT_SYMBOL(pci_scan_bridge);
1510 EXPORT_SYMBOL_GPL(pci_scan_child_bus);
1513 static int __init pci_sort_bf_cmp(const struct device *d_a, const struct device *d_b)
1515 const struct pci_dev *a = to_pci_dev(d_a);
1516 const struct pci_dev *b = to_pci_dev(d_b);
1518 if (pci_domain_nr(a->bus) < pci_domain_nr(b->bus)) return -1;
1519 else if (pci_domain_nr(a->bus) > pci_domain_nr(b->bus)) return 1;
1521 if (a->bus->number < b->bus->number) return -1;
1522 else if (a->bus->number > b->bus->number) return 1;
1524 if (a->devfn < b->devfn) return -1;
1525 else if (a->devfn > b->devfn) return 1;
1530 void __init pci_sort_breadthfirst(void)
1532 bus_sort_breadthfirst(&pci_bus_type, &pci_sort_bf_cmp);