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);
70 static u64 pci_size(u64 base, u64 maxbase, u64 mask)
72 u64 size = mask & maxbase; /* Find the significant bits */
76 /* Get the lowest of them to find the decode size, and
77 from that the extent. */
78 size = (size & ~(size-1)) - 1;
80 /* base == maxbase can be valid only if the BAR has
81 already been programmed with all 1s. */
82 if (base == maxbase && ((base | size) & mask) != mask)
88 static inline unsigned long decode_bar(struct pci_dev *dev, u32 bar)
93 if ((bar & PCI_BASE_ADDRESS_SPACE) == PCI_BASE_ADDRESS_SPACE_IO) {
94 flags = bar & ~PCI_BASE_ADDRESS_IO_MASK;
95 flags |= IORESOURCE_IO;
99 flags = bar & ~PCI_BASE_ADDRESS_MEM_MASK;
100 flags |= IORESOURCE_MEM;
101 if (flags & PCI_BASE_ADDRESS_MEM_PREFETCH)
102 flags |= IORESOURCE_PREFETCH;
104 mem_type = bar & PCI_BASE_ADDRESS_MEM_TYPE_MASK;
106 case PCI_BASE_ADDRESS_MEM_TYPE_32:
108 case PCI_BASE_ADDRESS_MEM_TYPE_1M:
109 dev_info(&dev->dev, "1M mem BAR treated as 32-bit BAR\n");
111 case PCI_BASE_ADDRESS_MEM_TYPE_64:
112 flags |= IORESOURCE_MEM_64;
116 "mem unknown type %x treated as 32-bit BAR\n",
124 * pci_read_base - read a PCI BAR
125 * @dev: the PCI device
126 * @type: type of the BAR
127 * @res: resource buffer to be filled in
128 * @pos: BAR position in the config space
130 * Returns 1 if the BAR is 64-bit, or 0 if 32-bit.
132 int __pci_read_base(struct pci_dev *dev, enum pci_bar_type type,
133 struct resource *res, unsigned int pos)
138 mask = type ? PCI_ROM_ADDRESS_MASK : ~0;
140 if (!dev->mmio_always_on) {
141 pci_read_config_word(dev, PCI_COMMAND, &orig_cmd);
142 pci_write_config_word(dev, PCI_COMMAND,
143 orig_cmd & ~(PCI_COMMAND_MEMORY | PCI_COMMAND_IO));
146 res->name = pci_name(dev);
148 pci_read_config_dword(dev, pos, &l);
149 pci_write_config_dword(dev, pos, l | mask);
150 pci_read_config_dword(dev, pos, &sz);
151 pci_write_config_dword(dev, pos, l);
153 if (!dev->mmio_always_on)
154 pci_write_config_word(dev, PCI_COMMAND, orig_cmd);
157 * All bits set in sz means the device isn't working properly.
158 * If the BAR isn't implemented, all bits must be 0. If it's a
159 * memory BAR or a ROM, bit 0 must be clear; if it's an io BAR, bit
162 if (!sz || sz == 0xffffffff)
166 * I don't know how l can have all bits set. Copied from old code.
167 * Maybe it fixes a bug on some ancient platform.
172 if (type == pci_bar_unknown) {
173 res->flags = decode_bar(dev, l);
174 res->flags |= IORESOURCE_SIZEALIGN;
175 if (res->flags & IORESOURCE_IO) {
176 l &= PCI_BASE_ADDRESS_IO_MASK;
177 mask = PCI_BASE_ADDRESS_IO_MASK & (u32) IO_SPACE_LIMIT;
179 l &= PCI_BASE_ADDRESS_MEM_MASK;
180 mask = (u32)PCI_BASE_ADDRESS_MEM_MASK;
183 res->flags |= (l & IORESOURCE_ROM_ENABLE);
184 l &= PCI_ROM_ADDRESS_MASK;
185 mask = (u32)PCI_ROM_ADDRESS_MASK;
188 if (res->flags & IORESOURCE_MEM_64) {
191 u64 mask64 = mask | (u64)~0 << 32;
193 pci_read_config_dword(dev, pos + 4, &l);
194 pci_write_config_dword(dev, pos + 4, ~0);
195 pci_read_config_dword(dev, pos + 4, &sz);
196 pci_write_config_dword(dev, pos + 4, l);
198 l64 |= ((u64)l << 32);
199 sz64 |= ((u64)sz << 32);
201 sz64 = pci_size(l64, sz64, mask64);
206 if ((sizeof(resource_size_t) < 8) && (sz64 > 0x100000000ULL)) {
207 dev_err(&dev->dev, "reg %x: can't handle 64-bit BAR\n",
212 if ((sizeof(resource_size_t) < 8) && l) {
213 /* Address above 32-bit boundary; disable the BAR */
214 pci_write_config_dword(dev, pos, 0);
215 pci_write_config_dword(dev, pos + 4, 0);
220 res->end = l64 + sz64;
221 dev_printk(KERN_DEBUG, &dev->dev, "reg %x: %pR\n",
225 sz = pci_size(l, sz, mask);
233 dev_printk(KERN_DEBUG, &dev->dev, "reg %x: %pR\n", pos, res);
237 return (res->flags & IORESOURCE_MEM_64) ? 1 : 0;
243 static void pci_read_bases(struct pci_dev *dev, unsigned int howmany, int rom)
245 unsigned int pos, reg;
247 for (pos = 0; pos < howmany; pos++) {
248 struct resource *res = &dev->resource[pos];
249 reg = PCI_BASE_ADDRESS_0 + (pos << 2);
250 pos += __pci_read_base(dev, pci_bar_unknown, res, reg);
254 struct resource *res = &dev->resource[PCI_ROM_RESOURCE];
255 dev->rom_base_reg = rom;
256 res->flags = IORESOURCE_MEM | IORESOURCE_PREFETCH |
257 IORESOURCE_READONLY | IORESOURCE_CACHEABLE |
258 IORESOURCE_SIZEALIGN;
259 __pci_read_base(dev, pci_bar_mem32, res, rom);
263 static void __devinit pci_read_bridge_io(struct pci_bus *child)
265 struct pci_dev *dev = child->self;
266 u8 io_base_lo, io_limit_lo;
267 unsigned long base, limit;
268 struct resource *res;
270 res = child->resource[0];
271 pci_read_config_byte(dev, PCI_IO_BASE, &io_base_lo);
272 pci_read_config_byte(dev, PCI_IO_LIMIT, &io_limit_lo);
273 base = (io_base_lo & PCI_IO_RANGE_MASK) << 8;
274 limit = (io_limit_lo & PCI_IO_RANGE_MASK) << 8;
276 if ((io_base_lo & PCI_IO_RANGE_TYPE_MASK) == PCI_IO_RANGE_TYPE_32) {
277 u16 io_base_hi, io_limit_hi;
278 pci_read_config_word(dev, PCI_IO_BASE_UPPER16, &io_base_hi);
279 pci_read_config_word(dev, PCI_IO_LIMIT_UPPER16, &io_limit_hi);
280 base |= (io_base_hi << 16);
281 limit |= (io_limit_hi << 16);
284 if (base && base <= limit) {
285 res->flags = (io_base_lo & PCI_IO_RANGE_TYPE_MASK) | IORESOURCE_IO;
289 res->end = limit + 0xfff;
290 dev_printk(KERN_DEBUG, &dev->dev, " bridge window %pR\n", res);
292 dev_printk(KERN_DEBUG, &dev->dev,
293 " bridge window [io %#06lx-%#06lx] (disabled)\n",
298 static void __devinit pci_read_bridge_mmio(struct pci_bus *child)
300 struct pci_dev *dev = child->self;
301 u16 mem_base_lo, mem_limit_lo;
302 unsigned long base, limit;
303 struct resource *res;
305 res = child->resource[1];
306 pci_read_config_word(dev, PCI_MEMORY_BASE, &mem_base_lo);
307 pci_read_config_word(dev, PCI_MEMORY_LIMIT, &mem_limit_lo);
308 base = (mem_base_lo & PCI_MEMORY_RANGE_MASK) << 16;
309 limit = (mem_limit_lo & PCI_MEMORY_RANGE_MASK) << 16;
310 if (base && base <= limit) {
311 res->flags = (mem_base_lo & PCI_MEMORY_RANGE_TYPE_MASK) | IORESOURCE_MEM;
313 res->end = limit + 0xfffff;
314 dev_printk(KERN_DEBUG, &dev->dev, " bridge window %pR\n", res);
316 dev_printk(KERN_DEBUG, &dev->dev,
317 " bridge window [mem %#010lx-%#010lx] (disabled)\n",
318 base, limit + 0xfffff);
322 static void __devinit pci_read_bridge_mmio_pref(struct pci_bus *child)
324 struct pci_dev *dev = child->self;
325 u16 mem_base_lo, mem_limit_lo;
326 unsigned long base, limit;
327 struct resource *res;
329 res = child->resource[2];
330 pci_read_config_word(dev, PCI_PREF_MEMORY_BASE, &mem_base_lo);
331 pci_read_config_word(dev, PCI_PREF_MEMORY_LIMIT, &mem_limit_lo);
332 base = (mem_base_lo & PCI_PREF_RANGE_MASK) << 16;
333 limit = (mem_limit_lo & PCI_PREF_RANGE_MASK) << 16;
335 if ((mem_base_lo & PCI_PREF_RANGE_TYPE_MASK) == PCI_PREF_RANGE_TYPE_64) {
336 u32 mem_base_hi, mem_limit_hi;
337 pci_read_config_dword(dev, PCI_PREF_BASE_UPPER32, &mem_base_hi);
338 pci_read_config_dword(dev, PCI_PREF_LIMIT_UPPER32, &mem_limit_hi);
341 * Some bridges set the base > limit by default, and some
342 * (broken) BIOSes do not initialize them. If we find
343 * this, just assume they are not being used.
345 if (mem_base_hi <= mem_limit_hi) {
346 #if BITS_PER_LONG == 64
347 base |= ((long) mem_base_hi) << 32;
348 limit |= ((long) mem_limit_hi) << 32;
350 if (mem_base_hi || mem_limit_hi) {
351 dev_err(&dev->dev, "can't handle 64-bit "
352 "address space for bridge\n");
358 if (base && base <= limit) {
359 res->flags = (mem_base_lo & PCI_PREF_RANGE_TYPE_MASK) |
360 IORESOURCE_MEM | IORESOURCE_PREFETCH;
361 if (res->flags & PCI_PREF_RANGE_TYPE_64)
362 res->flags |= IORESOURCE_MEM_64;
364 res->end = limit + 0xfffff;
365 dev_printk(KERN_DEBUG, &dev->dev, " bridge window %pR\n", res);
367 dev_printk(KERN_DEBUG, &dev->dev,
368 " bridge window [mem %#010lx-%#010lx pref] (disabled)\n",
369 base, limit + 0xfffff);
373 void __devinit pci_read_bridge_bases(struct pci_bus *child)
375 struct pci_dev *dev = child->self;
376 struct resource *res;
379 if (pci_is_root_bus(child)) /* It's a host bus, nothing to read */
382 dev_info(&dev->dev, "PCI bridge to [bus %02x-%02x]%s\n",
383 child->secondary, child->subordinate,
384 dev->transparent ? " (subtractive decode)" : "");
386 pci_bus_remove_resources(child);
387 for (i = 0; i < PCI_BRIDGE_RESOURCE_NUM; i++)
388 child->resource[i] = &dev->resource[PCI_BRIDGE_RESOURCES+i];
390 pci_read_bridge_io(child);
391 pci_read_bridge_mmio(child);
392 pci_read_bridge_mmio_pref(child);
394 if (dev->transparent) {
395 pci_bus_for_each_resource(child->parent, res, i) {
397 pci_bus_add_resource(child, res,
398 PCI_SUBTRACTIVE_DECODE);
399 dev_printk(KERN_DEBUG, &dev->dev,
400 " bridge window %pR (subtractive decode)\n",
407 static struct pci_bus * pci_alloc_bus(void)
411 b = kzalloc(sizeof(*b), GFP_KERNEL);
413 INIT_LIST_HEAD(&b->node);
414 INIT_LIST_HEAD(&b->children);
415 INIT_LIST_HEAD(&b->devices);
416 INIT_LIST_HEAD(&b->slots);
417 INIT_LIST_HEAD(&b->resources);
418 b->max_bus_speed = PCI_SPEED_UNKNOWN;
419 b->cur_bus_speed = PCI_SPEED_UNKNOWN;
424 static unsigned char pcix_bus_speed[] = {
425 PCI_SPEED_UNKNOWN, /* 0 */
426 PCI_SPEED_66MHz_PCIX, /* 1 */
427 PCI_SPEED_100MHz_PCIX, /* 2 */
428 PCI_SPEED_133MHz_PCIX, /* 3 */
429 PCI_SPEED_UNKNOWN, /* 4 */
430 PCI_SPEED_66MHz_PCIX_ECC, /* 5 */
431 PCI_SPEED_100MHz_PCIX_ECC, /* 6 */
432 PCI_SPEED_133MHz_PCIX_ECC, /* 7 */
433 PCI_SPEED_UNKNOWN, /* 8 */
434 PCI_SPEED_66MHz_PCIX_266, /* 9 */
435 PCI_SPEED_100MHz_PCIX_266, /* A */
436 PCI_SPEED_133MHz_PCIX_266, /* B */
437 PCI_SPEED_UNKNOWN, /* C */
438 PCI_SPEED_66MHz_PCIX_533, /* D */
439 PCI_SPEED_100MHz_PCIX_533, /* E */
440 PCI_SPEED_133MHz_PCIX_533 /* F */
443 static unsigned char pcie_link_speed[] = {
444 PCI_SPEED_UNKNOWN, /* 0 */
445 PCIE_SPEED_2_5GT, /* 1 */
446 PCIE_SPEED_5_0GT, /* 2 */
447 PCIE_SPEED_8_0GT, /* 3 */
448 PCI_SPEED_UNKNOWN, /* 4 */
449 PCI_SPEED_UNKNOWN, /* 5 */
450 PCI_SPEED_UNKNOWN, /* 6 */
451 PCI_SPEED_UNKNOWN, /* 7 */
452 PCI_SPEED_UNKNOWN, /* 8 */
453 PCI_SPEED_UNKNOWN, /* 9 */
454 PCI_SPEED_UNKNOWN, /* A */
455 PCI_SPEED_UNKNOWN, /* B */
456 PCI_SPEED_UNKNOWN, /* C */
457 PCI_SPEED_UNKNOWN, /* D */
458 PCI_SPEED_UNKNOWN, /* E */
459 PCI_SPEED_UNKNOWN /* F */
462 void pcie_update_link_speed(struct pci_bus *bus, u16 linksta)
464 bus->cur_bus_speed = pcie_link_speed[linksta & 0xf];
466 EXPORT_SYMBOL_GPL(pcie_update_link_speed);
468 static unsigned char agp_speeds[] = {
476 static enum pci_bus_speed agp_speed(int agp3, int agpstat)
482 else if (agpstat & 2)
484 else if (agpstat & 1)
496 return agp_speeds[index];
500 static void pci_set_bus_speed(struct pci_bus *bus)
502 struct pci_dev *bridge = bus->self;
505 pos = pci_find_capability(bridge, PCI_CAP_ID_AGP);
507 pos = pci_find_capability(bridge, PCI_CAP_ID_AGP3);
511 pci_read_config_dword(bridge, pos + PCI_AGP_STATUS, &agpstat);
512 bus->max_bus_speed = agp_speed(agpstat & 8, agpstat & 7);
514 pci_read_config_dword(bridge, pos + PCI_AGP_COMMAND, &agpcmd);
515 bus->cur_bus_speed = agp_speed(agpstat & 8, agpcmd & 7);
518 pos = pci_find_capability(bridge, PCI_CAP_ID_PCIX);
521 enum pci_bus_speed max;
522 pci_read_config_word(bridge, pos + 2, &status);
524 if (status & 0x8000) {
525 max = PCI_SPEED_133MHz_PCIX_533;
526 } else if (status & 0x4000) {
527 max = PCI_SPEED_133MHz_PCIX_266;
528 } else if (status & 0x0002) {
529 if (((status >> 12) & 0x3) == 2) {
530 max = PCI_SPEED_133MHz_PCIX_ECC;
532 max = PCI_SPEED_133MHz_PCIX;
535 max = PCI_SPEED_66MHz_PCIX;
538 bus->max_bus_speed = max;
539 bus->cur_bus_speed = pcix_bus_speed[(status >> 6) & 0xf];
544 pos = pci_find_capability(bridge, PCI_CAP_ID_EXP);
549 pci_read_config_dword(bridge, pos + PCI_EXP_LNKCAP, &linkcap);
550 bus->max_bus_speed = pcie_link_speed[linkcap & 0xf];
552 pci_read_config_word(bridge, pos + PCI_EXP_LNKSTA, &linksta);
553 pcie_update_link_speed(bus, linksta);
558 static struct pci_bus *pci_alloc_child_bus(struct pci_bus *parent,
559 struct pci_dev *bridge, int busnr)
561 struct pci_bus *child;
565 * Allocate a new bus, and inherit stuff from the parent..
567 child = pci_alloc_bus();
571 child->parent = parent;
572 child->ops = parent->ops;
573 child->sysdata = parent->sysdata;
574 child->bus_flags = parent->bus_flags;
576 /* initialize some portions of the bus device, but don't register it
577 * now as the parent is not properly set up yet. This device will get
578 * registered later in pci_bus_add_devices()
580 child->dev.class = &pcibus_class;
581 dev_set_name(&child->dev, "%04x:%02x", pci_domain_nr(child), busnr);
584 * Set up the primary, secondary and subordinate
587 child->number = child->secondary = busnr;
588 child->primary = parent->secondary;
589 child->subordinate = 0xff;
594 child->self = bridge;
595 child->bridge = get_device(&bridge->dev);
597 pci_set_bus_speed(child);
599 /* Set up default resource pointers and names.. */
600 for (i = 0; i < PCI_BRIDGE_RESOURCE_NUM; i++) {
601 child->resource[i] = &bridge->resource[PCI_BRIDGE_RESOURCES+i];
602 child->resource[i]->name = child->name;
604 bridge->subordinate = child;
609 struct pci_bus *__ref pci_add_new_bus(struct pci_bus *parent, struct pci_dev *dev, int busnr)
611 struct pci_bus *child;
613 child = pci_alloc_child_bus(parent, dev, busnr);
615 down_write(&pci_bus_sem);
616 list_add_tail(&child->node, &parent->children);
617 up_write(&pci_bus_sem);
622 static void pci_fixup_parent_subordinate_busnr(struct pci_bus *child, int max)
624 struct pci_bus *parent = child->parent;
626 /* Attempts to fix that up are really dangerous unless
627 we're going to re-assign all bus numbers. */
628 if (!pcibios_assign_all_busses())
631 while (parent->parent && parent->subordinate < max) {
632 parent->subordinate = max;
633 pci_write_config_byte(parent->self, PCI_SUBORDINATE_BUS, max);
634 parent = parent->parent;
639 * If it's a bridge, configure it and scan the bus behind it.
640 * For CardBus bridges, we don't scan behind as the devices will
641 * be handled by the bridge driver itself.
643 * We need to process bridges in two passes -- first we scan those
644 * already configured by the BIOS and after we are done with all of
645 * them, we proceed to assigning numbers to the remaining buses in
646 * order to avoid overlaps between old and new bus numbers.
648 int __devinit pci_scan_bridge(struct pci_bus *bus, struct pci_dev *dev, int max, int pass)
650 struct pci_bus *child;
651 int is_cardbus = (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS);
654 u8 primary, secondary, subordinate;
657 pci_read_config_dword(dev, PCI_PRIMARY_BUS, &buses);
658 primary = buses & 0xFF;
659 secondary = (buses >> 8) & 0xFF;
660 subordinate = (buses >> 16) & 0xFF;
662 dev_dbg(&dev->dev, "scanning [bus %02x-%02x] behind bridge, pass %d\n",
663 secondary, subordinate, pass);
665 /* Check if setup is sensible at all */
667 (primary != bus->number || secondary <= bus->number)) {
668 dev_dbg(&dev->dev, "bus configuration invalid, reconfiguring\n");
672 /* Disable MasterAbortMode during probing to avoid reporting
673 of bus errors (in some architectures) */
674 pci_read_config_word(dev, PCI_BRIDGE_CONTROL, &bctl);
675 pci_write_config_word(dev, PCI_BRIDGE_CONTROL,
676 bctl & ~PCI_BRIDGE_CTL_MASTER_ABORT);
678 if ((secondary || subordinate) && !pcibios_assign_all_busses() &&
679 !is_cardbus && !broken) {
682 * Bus already configured by firmware, process it in the first
683 * pass and just note the configuration.
689 * If we already got to this bus through a different bridge,
690 * don't re-add it. This can happen with the i450NX chipset.
692 * However, we continue to descend down the hierarchy and
693 * scan remaining child buses.
695 child = pci_find_bus(pci_domain_nr(bus), secondary);
697 child = pci_add_new_bus(bus, dev, secondary);
700 child->primary = primary;
701 child->subordinate = subordinate;
702 child->bridge_ctl = bctl;
705 cmax = pci_scan_child_bus(child);
708 if (child->subordinate > max)
709 max = child->subordinate;
712 * We need to assign a number to this bus which we always
713 * do in the second pass.
716 if (pcibios_assign_all_busses() || broken)
717 /* Temporarily disable forwarding of the
718 configuration cycles on all bridges in
719 this bus segment to avoid possible
720 conflicts in the second pass between two
721 bridges programmed with overlapping
723 pci_write_config_dword(dev, PCI_PRIMARY_BUS,
729 pci_write_config_word(dev, PCI_STATUS, 0xffff);
731 /* Prevent assigning a bus number that already exists.
732 * This can happen when a bridge is hot-plugged, so in
733 * this case we only re-scan this bus. */
734 child = pci_find_bus(pci_domain_nr(bus), max+1);
736 child = pci_add_new_bus(bus, dev, ++max);
740 buses = (buses & 0xff000000)
741 | ((unsigned int)(child->primary) << 0)
742 | ((unsigned int)(child->secondary) << 8)
743 | ((unsigned int)(child->subordinate) << 16);
746 * yenta.c forces a secondary latency timer of 176.
747 * Copy that behaviour here.
750 buses &= ~0xff000000;
751 buses |= CARDBUS_LATENCY_TIMER << 24;
755 * We need to blast all three values with a single write.
757 pci_write_config_dword(dev, PCI_PRIMARY_BUS, buses);
760 child->bridge_ctl = bctl;
762 * Adjust subordinate busnr in parent buses.
763 * We do this before scanning for children because
764 * some devices may not be detected if the bios
767 pci_fixup_parent_subordinate_busnr(child, max);
768 /* Now we can scan all subordinate buses... */
769 max = pci_scan_child_bus(child);
771 * now fix it up again since we have found
772 * the real value of max.
774 pci_fixup_parent_subordinate_busnr(child, max);
777 * For CardBus bridges, we leave 4 bus numbers
778 * as cards with a PCI-to-PCI bridge can be
781 for (i=0; i<CARDBUS_RESERVE_BUSNR; i++) {
782 struct pci_bus *parent = bus;
783 if (pci_find_bus(pci_domain_nr(bus),
786 while (parent->parent) {
787 if ((!pcibios_assign_all_busses()) &&
788 (parent->subordinate > max) &&
789 (parent->subordinate <= max+i)) {
792 parent = parent->parent;
796 * Often, there are two cardbus bridges
797 * -- try to leave one valid bus number
805 pci_fixup_parent_subordinate_busnr(child, max);
808 * Set the subordinate bus number to its real value.
810 child->subordinate = max;
811 pci_write_config_byte(dev, PCI_SUBORDINATE_BUS, max);
815 (is_cardbus ? "PCI CardBus %04x:%02x" : "PCI Bus %04x:%02x"),
816 pci_domain_nr(bus), child->number);
818 /* Has only triggered on CardBus, fixup is in yenta_socket */
819 while (bus->parent) {
820 if ((child->subordinate > bus->subordinate) ||
821 (child->number > bus->subordinate) ||
822 (child->number < bus->number) ||
823 (child->subordinate < bus->number)) {
824 dev_info(&child->dev, "[bus %02x-%02x] %s "
825 "hidden behind%s bridge %s [bus %02x-%02x]\n",
826 child->number, child->subordinate,
827 (bus->number > child->subordinate &&
828 bus->subordinate < child->number) ?
829 "wholly" : "partially",
830 bus->self->transparent ? " transparent" : "",
832 bus->number, bus->subordinate);
838 pci_write_config_word(dev, PCI_BRIDGE_CONTROL, bctl);
844 * Read interrupt line and base address registers.
845 * The architecture-dependent code can tweak these, of course.
847 static void pci_read_irq(struct pci_dev *dev)
851 pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &irq);
854 pci_read_config_byte(dev, PCI_INTERRUPT_LINE, &irq);
858 void set_pcie_port_type(struct pci_dev *pdev)
863 pos = pci_find_capability(pdev, PCI_CAP_ID_EXP);
867 pdev->pcie_cap = pos;
868 pci_read_config_word(pdev, pos + PCI_EXP_FLAGS, ®16);
869 pdev->pcie_type = (reg16 & PCI_EXP_FLAGS_TYPE) >> 4;
872 void set_pcie_hotplug_bridge(struct pci_dev *pdev)
878 pos = pci_pcie_cap(pdev);
881 pci_read_config_word(pdev, pos + PCI_EXP_FLAGS, ®16);
882 if (!(reg16 & PCI_EXP_FLAGS_SLOT))
884 pci_read_config_dword(pdev, pos + PCI_EXP_SLTCAP, ®32);
885 if (reg32 & PCI_EXP_SLTCAP_HPC)
886 pdev->is_hotplug_bridge = 1;
889 #define LEGACY_IO_RESOURCE (IORESOURCE_IO | IORESOURCE_PCI_FIXED)
892 * pci_setup_device - fill in class and map information of a device
893 * @dev: the device structure to fill
895 * Initialize the device structure with information about the device's
896 * vendor,class,memory and IO-space addresses,IRQ lines etc.
897 * Called at initialisation of the PCI subsystem and by CardBus services.
898 * Returns 0 on success and negative if unknown type of device (not normal,
899 * bridge or CardBus).
901 int pci_setup_device(struct pci_dev *dev)
905 struct pci_slot *slot;
908 if (pci_read_config_byte(dev, PCI_HEADER_TYPE, &hdr_type))
911 dev->sysdata = dev->bus->sysdata;
912 dev->dev.parent = dev->bus->bridge;
913 dev->dev.bus = &pci_bus_type;
914 dev->hdr_type = hdr_type & 0x7f;
915 dev->multifunction = !!(hdr_type & 0x80);
916 dev->error_state = pci_channel_io_normal;
917 set_pcie_port_type(dev);
919 list_for_each_entry(slot, &dev->bus->slots, list)
920 if (PCI_SLOT(dev->devfn) == slot->number)
923 /* Assume 32-bit PCI; let 64-bit PCI cards (which are far rarer)
924 set this higher, assuming the system even supports it. */
925 dev->dma_mask = 0xffffffff;
927 dev_set_name(&dev->dev, "%04x:%02x:%02x.%d", pci_domain_nr(dev->bus),
928 dev->bus->number, PCI_SLOT(dev->devfn),
929 PCI_FUNC(dev->devfn));
931 pci_read_config_dword(dev, PCI_CLASS_REVISION, &class);
932 dev->revision = class & 0xff;
933 class >>= 8; /* upper 3 bytes */
937 dev_printk(KERN_DEBUG, &dev->dev, "[%04x:%04x] type %d class %#08x\n",
938 dev->vendor, dev->device, dev->hdr_type, class);
940 /* need to have dev->class ready */
941 dev->cfg_size = pci_cfg_space_size(dev);
943 /* "Unknown power state" */
944 dev->current_state = PCI_UNKNOWN;
946 /* Early fixups, before probing the BARs */
947 pci_fixup_device(pci_fixup_early, dev);
948 /* device class may be changed after fixup */
949 class = dev->class >> 8;
951 switch (dev->hdr_type) { /* header type */
952 case PCI_HEADER_TYPE_NORMAL: /* standard header */
953 if (class == PCI_CLASS_BRIDGE_PCI)
956 pci_read_bases(dev, 6, PCI_ROM_ADDRESS);
957 pci_read_config_word(dev, PCI_SUBSYSTEM_VENDOR_ID, &dev->subsystem_vendor);
958 pci_read_config_word(dev, PCI_SUBSYSTEM_ID, &dev->subsystem_device);
961 * Do the ugly legacy mode stuff here rather than broken chip
962 * quirk code. Legacy mode ATA controllers have fixed
963 * addresses. These are not always echoed in BAR0-3, and
964 * BAR0-3 in a few cases contain junk!
966 if (class == PCI_CLASS_STORAGE_IDE) {
968 pci_read_config_byte(dev, PCI_CLASS_PROG, &progif);
969 if ((progif & 1) == 0) {
970 dev->resource[0].start = 0x1F0;
971 dev->resource[0].end = 0x1F7;
972 dev->resource[0].flags = LEGACY_IO_RESOURCE;
973 dev->resource[1].start = 0x3F6;
974 dev->resource[1].end = 0x3F6;
975 dev->resource[1].flags = LEGACY_IO_RESOURCE;
977 if ((progif & 4) == 0) {
978 dev->resource[2].start = 0x170;
979 dev->resource[2].end = 0x177;
980 dev->resource[2].flags = LEGACY_IO_RESOURCE;
981 dev->resource[3].start = 0x376;
982 dev->resource[3].end = 0x376;
983 dev->resource[3].flags = LEGACY_IO_RESOURCE;
988 case PCI_HEADER_TYPE_BRIDGE: /* bridge header */
989 if (class != PCI_CLASS_BRIDGE_PCI)
991 /* The PCI-to-PCI bridge spec requires that subtractive
992 decoding (i.e. transparent) bridge must have programming
993 interface code of 0x01. */
995 dev->transparent = ((dev->class & 0xff) == 1);
996 pci_read_bases(dev, 2, PCI_ROM_ADDRESS1);
997 set_pcie_hotplug_bridge(dev);
998 pos = pci_find_capability(dev, PCI_CAP_ID_SSVID);
1000 pci_read_config_word(dev, pos + PCI_SSVID_VENDOR_ID, &dev->subsystem_vendor);
1001 pci_read_config_word(dev, pos + PCI_SSVID_DEVICE_ID, &dev->subsystem_device);
1005 case PCI_HEADER_TYPE_CARDBUS: /* CardBus bridge header */
1006 if (class != PCI_CLASS_BRIDGE_CARDBUS)
1009 pci_read_bases(dev, 1, 0);
1010 pci_read_config_word(dev, PCI_CB_SUBSYSTEM_VENDOR_ID, &dev->subsystem_vendor);
1011 pci_read_config_word(dev, PCI_CB_SUBSYSTEM_ID, &dev->subsystem_device);
1014 default: /* unknown header */
1015 dev_err(&dev->dev, "unknown header type %02x, "
1016 "ignoring device\n", dev->hdr_type);
1020 dev_err(&dev->dev, "ignoring class %02x (doesn't match header "
1021 "type %02x)\n", class, dev->hdr_type);
1022 dev->class = PCI_CLASS_NOT_DEFINED;
1025 /* We found a fine healthy device, go go go... */
1029 static void pci_release_capabilities(struct pci_dev *dev)
1031 pci_vpd_release(dev);
1032 pci_iov_release(dev);
1036 * pci_release_dev - free a pci device structure when all users of it are finished.
1037 * @dev: device that's been disconnected
1039 * Will be called only by the device core when all users of this pci device are
1042 static void pci_release_dev(struct device *dev)
1044 struct pci_dev *pci_dev;
1046 pci_dev = to_pci_dev(dev);
1047 pci_release_capabilities(pci_dev);
1052 * pci_cfg_space_size - get the configuration space size of the PCI device.
1055 * Regular PCI devices have 256 bytes, but PCI-X 2 and PCI Express devices
1056 * have 4096 bytes. Even if the device is capable, that doesn't mean we can
1057 * access it. Maybe we don't have a way to generate extended config space
1058 * accesses, or the device is behind a reverse Express bridge. So we try
1059 * reading the dword at 0x100 which must either be 0 or a valid extended
1060 * capability header.
1062 int pci_cfg_space_size_ext(struct pci_dev *dev)
1065 int pos = PCI_CFG_SPACE_SIZE;
1067 if (pci_read_config_dword(dev, pos, &status) != PCIBIOS_SUCCESSFUL)
1069 if (status == 0xffffffff)
1072 return PCI_CFG_SPACE_EXP_SIZE;
1075 return PCI_CFG_SPACE_SIZE;
1078 int pci_cfg_space_size(struct pci_dev *dev)
1084 class = dev->class >> 8;
1085 if (class == PCI_CLASS_BRIDGE_HOST)
1086 return pci_cfg_space_size_ext(dev);
1088 pos = pci_pcie_cap(dev);
1090 pos = pci_find_capability(dev, PCI_CAP_ID_PCIX);
1094 pci_read_config_dword(dev, pos + PCI_X_STATUS, &status);
1095 if (!(status & (PCI_X_STATUS_266MHZ | PCI_X_STATUS_533MHZ)))
1099 return pci_cfg_space_size_ext(dev);
1102 return PCI_CFG_SPACE_SIZE;
1105 static void pci_release_bus_bridge_dev(struct device *dev)
1110 struct pci_dev *alloc_pci_dev(void)
1112 struct pci_dev *dev;
1114 dev = kzalloc(sizeof(struct pci_dev), GFP_KERNEL);
1118 INIT_LIST_HEAD(&dev->bus_list);
1122 EXPORT_SYMBOL(alloc_pci_dev);
1125 * Read the config data for a PCI device, sanity-check it
1126 * and fill in the dev structure...
1128 static struct pci_dev *pci_scan_device(struct pci_bus *bus, int devfn)
1130 struct pci_dev *dev;
1134 if (pci_bus_read_config_dword(bus, devfn, PCI_VENDOR_ID, &l))
1137 /* some broken boards return 0 or ~0 if a slot is empty: */
1138 if (l == 0xffffffff || l == 0x00000000 ||
1139 l == 0x0000ffff || l == 0xffff0000)
1142 /* Configuration request Retry Status */
1143 while (l == 0xffff0001) {
1146 if (pci_bus_read_config_dword(bus, devfn, PCI_VENDOR_ID, &l))
1148 /* Card hasn't responded in 60 seconds? Must be stuck. */
1149 if (delay > 60 * 1000) {
1150 printk(KERN_WARNING "pci %04x:%02x:%02x.%d: not "
1151 "responding\n", pci_domain_nr(bus),
1152 bus->number, PCI_SLOT(devfn),
1158 dev = alloc_pci_dev();
1164 dev->vendor = l & 0xffff;
1165 dev->device = (l >> 16) & 0xffff;
1167 if (pci_setup_device(dev)) {
1175 static void pci_init_capabilities(struct pci_dev *dev)
1177 /* MSI/MSI-X list */
1178 pci_msi_init_pci_dev(dev);
1180 /* Buffers for saving PCIe and PCI-X capabilities */
1181 pci_allocate_cap_save_buffers(dev);
1183 /* Power Management */
1185 platform_pci_wakeup_init(dev);
1187 /* Vital Product Data */
1188 pci_vpd_pci22_init(dev);
1190 /* Alternative Routing-ID Forwarding */
1191 pci_enable_ari(dev);
1193 /* Single Root I/O Virtualization */
1196 /* Enable ACS P2P upstream forwarding */
1197 pci_enable_acs(dev);
1200 void pci_device_add(struct pci_dev *dev, struct pci_bus *bus)
1202 device_initialize(&dev->dev);
1203 dev->dev.release = pci_release_dev;
1206 dev->dev.dma_mask = &dev->dma_mask;
1207 dev->dev.dma_parms = &dev->dma_parms;
1208 dev->dev.coherent_dma_mask = 0xffffffffull;
1210 pci_set_dma_max_seg_size(dev, 65536);
1211 pci_set_dma_seg_boundary(dev, 0xffffffff);
1213 /* Fix up broken headers */
1214 pci_fixup_device(pci_fixup_header, dev);
1216 /* Clear the state_saved flag. */
1217 dev->state_saved = false;
1219 /* Initialize various capabilities */
1220 pci_init_capabilities(dev);
1223 * Add the device to our list of discovered devices
1224 * and the bus list for fixup functions, etc.
1226 down_write(&pci_bus_sem);
1227 list_add_tail(&dev->bus_list, &bus->devices);
1228 up_write(&pci_bus_sem);
1231 struct pci_dev *__ref pci_scan_single_device(struct pci_bus *bus, int devfn)
1233 struct pci_dev *dev;
1235 dev = pci_get_slot(bus, devfn);
1241 dev = pci_scan_device(bus, devfn);
1245 pci_device_add(dev, bus);
1249 EXPORT_SYMBOL(pci_scan_single_device);
1251 static unsigned next_ari_fn(struct pci_dev *dev, unsigned fn)
1254 unsigned pos, next_fn;
1259 pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ARI);
1262 pci_read_config_word(dev, pos + 4, &cap);
1269 static unsigned next_trad_fn(struct pci_dev *dev, unsigned fn)
1271 return (fn + 1) % 8;
1274 static unsigned no_next_fn(struct pci_dev *dev, unsigned fn)
1279 static int only_one_child(struct pci_bus *bus)
1281 struct pci_dev *parent = bus->self;
1282 if (!parent || !pci_is_pcie(parent))
1284 if (parent->pcie_type == PCI_EXP_TYPE_ROOT_PORT ||
1285 parent->pcie_type == PCI_EXP_TYPE_DOWNSTREAM)
1291 * pci_scan_slot - scan a PCI slot on a bus for devices.
1292 * @bus: PCI bus to scan
1293 * @devfn: slot number to scan (must have zero function.)
1295 * Scan a PCI slot on the specified PCI bus for devices, adding
1296 * discovered devices to the @bus->devices list. New devices
1297 * will not have is_added set.
1299 * Returns the number of new devices found.
1301 int pci_scan_slot(struct pci_bus *bus, int devfn)
1303 unsigned fn, nr = 0;
1304 struct pci_dev *dev;
1305 unsigned (*next_fn)(struct pci_dev *, unsigned) = no_next_fn;
1307 if (only_one_child(bus) && (devfn > 0))
1308 return 0; /* Already scanned the entire slot */
1310 dev = pci_scan_single_device(bus, devfn);
1316 if (pci_ari_enabled(bus))
1317 next_fn = next_ari_fn;
1318 else if (dev->multifunction)
1319 next_fn = next_trad_fn;
1321 for (fn = next_fn(dev, 0); fn > 0; fn = next_fn(dev, fn)) {
1322 dev = pci_scan_single_device(bus, devfn + fn);
1326 dev->multifunction = 1;
1330 /* only one slot has pcie device */
1331 if (bus->self && nr)
1332 pcie_aspm_init_link_state(bus->self);
1337 unsigned int __devinit pci_scan_child_bus(struct pci_bus *bus)
1339 unsigned int devfn, pass, max = bus->secondary;
1340 struct pci_dev *dev;
1342 dev_dbg(&bus->dev, "scanning bus\n");
1344 /* Go find them, Rover! */
1345 for (devfn = 0; devfn < 0x100; devfn += 8)
1346 pci_scan_slot(bus, devfn);
1348 /* Reserve buses for SR-IOV capability. */
1349 max += pci_iov_bus_range(bus);
1352 * After performing arch-dependent fixup of the bus, look behind
1353 * all PCI-to-PCI bridges on this bus.
1355 if (!bus->is_added) {
1356 dev_dbg(&bus->dev, "fixups for bus\n");
1357 pcibios_fixup_bus(bus);
1358 if (pci_is_root_bus(bus))
1362 for (pass=0; pass < 2; pass++)
1363 list_for_each_entry(dev, &bus->devices, bus_list) {
1364 if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE ||
1365 dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)
1366 max = pci_scan_bridge(bus, dev, max, pass);
1370 * We've scanned the bus and so we know all about what's on
1371 * the other side of any bridges that may be on this bus plus
1374 * Return how far we've got finding sub-buses.
1376 dev_dbg(&bus->dev, "bus scan returning with max=%02x\n", max);
1380 struct pci_bus * pci_create_bus(struct device *parent,
1381 int bus, struct pci_ops *ops, void *sysdata)
1384 struct pci_bus *b, *b2;
1387 b = pci_alloc_bus();
1391 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
1397 b->sysdata = sysdata;
1400 b2 = pci_find_bus(pci_domain_nr(b), bus);
1402 /* If we already got to this bus through a different bridge, ignore it */
1403 dev_dbg(&b2->dev, "bus already known\n");
1407 down_write(&pci_bus_sem);
1408 list_add_tail(&b->node, &pci_root_buses);
1409 up_write(&pci_bus_sem);
1411 dev->parent = parent;
1412 dev->release = pci_release_bus_bridge_dev;
1413 dev_set_name(dev, "pci%04x:%02x", pci_domain_nr(b), bus);
1414 error = device_register(dev);
1417 b->bridge = get_device(dev);
1418 device_enable_async_suspend(b->bridge);
1421 set_dev_node(b->bridge, pcibus_to_node(b));
1423 b->dev.class = &pcibus_class;
1424 b->dev.parent = b->bridge;
1425 dev_set_name(&b->dev, "%04x:%02x", pci_domain_nr(b), bus);
1426 error = device_register(&b->dev);
1428 goto class_dev_reg_err;
1430 /* Create legacy_io and legacy_mem files for this bus */
1431 pci_create_legacy_files(b);
1433 b->number = b->secondary = bus;
1434 b->resource[0] = &ioport_resource;
1435 b->resource[1] = &iomem_resource;
1440 device_unregister(dev);
1442 down_write(&pci_bus_sem);
1444 up_write(&pci_bus_sem);
1451 struct pci_bus * __devinit pci_scan_bus_parented(struct device *parent,
1452 int bus, struct pci_ops *ops, void *sysdata)
1456 b = pci_create_bus(parent, bus, ops, sysdata);
1458 b->subordinate = pci_scan_child_bus(b);
1461 EXPORT_SYMBOL(pci_scan_bus_parented);
1463 #ifdef CONFIG_HOTPLUG
1465 * pci_rescan_bus - scan a PCI bus for devices.
1466 * @bus: PCI bus to scan
1468 * Scan a PCI bus and child buses for new devices, adds them,
1471 * Returns the max number of subordinate bus discovered.
1473 unsigned int __ref pci_rescan_bus(struct pci_bus *bus)
1476 struct pci_dev *dev;
1478 max = pci_scan_child_bus(bus);
1480 down_read(&pci_bus_sem);
1481 list_for_each_entry(dev, &bus->devices, bus_list)
1482 if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE ||
1483 dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)
1484 if (dev->subordinate)
1485 pci_bus_size_bridges(dev->subordinate);
1486 up_read(&pci_bus_sem);
1488 pci_bus_assign_resources(bus);
1489 pci_enable_bridges(bus);
1490 pci_bus_add_devices(bus);
1494 EXPORT_SYMBOL_GPL(pci_rescan_bus);
1496 EXPORT_SYMBOL(pci_add_new_bus);
1497 EXPORT_SYMBOL(pci_scan_slot);
1498 EXPORT_SYMBOL(pci_scan_bridge);
1499 EXPORT_SYMBOL_GPL(pci_scan_child_bus);
1502 static int __init pci_sort_bf_cmp(const struct device *d_a, const struct device *d_b)
1504 const struct pci_dev *a = to_pci_dev(d_a);
1505 const struct pci_dev *b = to_pci_dev(d_b);
1507 if (pci_domain_nr(a->bus) < pci_domain_nr(b->bus)) return -1;
1508 else if (pci_domain_nr(a->bus) > pci_domain_nr(b->bus)) return 1;
1510 if (a->bus->number < b->bus->number) return -1;
1511 else if (a->bus->number > b->bus->number) return 1;
1513 if (a->devfn < b->devfn) return -1;
1514 else if (a->devfn > b->devfn) return 1;
1519 void __init pci_sort_breadthfirst(void)
1521 bus_sort_breadthfirst(&pci_bus_type, &pci_sort_bf_cmp);