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/of_pci.h>
10 #include <linux/pci_hotplug.h>
11 #include <linux/slab.h>
12 #include <linux/module.h>
13 #include <linux/cpumask.h>
14 #include <linux/pci-aspm.h>
15 #include <asm-generic/pci-bridge.h>
18 #define CARDBUS_LATENCY_TIMER 176 /* secondary latency timer */
19 #define CARDBUS_RESERVE_BUSNR 3
21 static struct resource busn_resource = {
25 .flags = IORESOURCE_BUS,
28 /* Ugh. Need to stop exporting this to modules. */
29 LIST_HEAD(pci_root_buses);
30 EXPORT_SYMBOL(pci_root_buses);
32 static LIST_HEAD(pci_domain_busn_res_list);
34 struct pci_domain_busn_res {
35 struct list_head list;
40 static struct resource *get_pci_domain_busn_res(int domain_nr)
42 struct pci_domain_busn_res *r;
44 list_for_each_entry(r, &pci_domain_busn_res_list, list)
45 if (r->domain_nr == domain_nr)
48 r = kzalloc(sizeof(*r), GFP_KERNEL);
52 r->domain_nr = domain_nr;
55 r->res.flags = IORESOURCE_BUS | IORESOURCE_PCI_FIXED;
57 list_add_tail(&r->list, &pci_domain_busn_res_list);
62 static int find_anything(struct device *dev, void *data)
68 * Some device drivers need know if pci is initiated.
69 * Basically, we think pci is not initiated when there
70 * is no device to be found on the pci_bus_type.
72 int no_pci_devices(void)
77 dev = bus_find_device(&pci_bus_type, NULL, NULL, find_anything);
78 no_devices = (dev == NULL);
82 EXPORT_SYMBOL(no_pci_devices);
87 static void release_pcibus_dev(struct device *dev)
89 struct pci_bus *pci_bus = to_pci_bus(dev);
91 put_device(pci_bus->bridge);
92 pci_bus_remove_resources(pci_bus);
93 pci_release_bus_of_node(pci_bus);
97 static struct class pcibus_class = {
99 .dev_release = &release_pcibus_dev,
100 .dev_groups = pcibus_groups,
103 static int __init pcibus_class_init(void)
105 return class_register(&pcibus_class);
107 postcore_initcall(pcibus_class_init);
109 static u64 pci_size(u64 base, u64 maxbase, u64 mask)
111 u64 size = mask & maxbase; /* Find the significant bits */
115 /* Get the lowest of them to find the decode size, and
116 from that the extent. */
117 size = (size & ~(size-1)) - 1;
119 /* base == maxbase can be valid only if the BAR has
120 already been programmed with all 1s. */
121 if (base == maxbase && ((base | size) & mask) != mask)
127 static inline unsigned long decode_bar(struct pci_dev *dev, u32 bar)
132 if ((bar & PCI_BASE_ADDRESS_SPACE) == PCI_BASE_ADDRESS_SPACE_IO) {
133 flags = bar & ~PCI_BASE_ADDRESS_IO_MASK;
134 flags |= IORESOURCE_IO;
138 flags = bar & ~PCI_BASE_ADDRESS_MEM_MASK;
139 flags |= IORESOURCE_MEM;
140 if (flags & PCI_BASE_ADDRESS_MEM_PREFETCH)
141 flags |= IORESOURCE_PREFETCH;
143 mem_type = bar & PCI_BASE_ADDRESS_MEM_TYPE_MASK;
145 case PCI_BASE_ADDRESS_MEM_TYPE_32:
147 case PCI_BASE_ADDRESS_MEM_TYPE_1M:
148 /* 1M mem BAR treated as 32-bit BAR */
150 case PCI_BASE_ADDRESS_MEM_TYPE_64:
151 flags |= IORESOURCE_MEM_64;
154 /* mem unknown type treated as 32-bit BAR */
160 #define PCI_COMMAND_DECODE_ENABLE (PCI_COMMAND_MEMORY | PCI_COMMAND_IO)
163 * pci_read_base - read a PCI BAR
164 * @dev: the PCI device
165 * @type: type of the BAR
166 * @res: resource buffer to be filled in
167 * @pos: BAR position in the config space
169 * Returns 1 if the BAR is 64-bit, or 0 if 32-bit.
171 int __pci_read_base(struct pci_dev *dev, enum pci_bar_type type,
172 struct resource *res, unsigned int pos)
175 u64 l64, sz64, mask64;
177 struct pci_bus_region region, inverted_region;
179 mask = type ? PCI_ROM_ADDRESS_MASK : ~0;
181 /* No printks while decoding is disabled! */
182 if (!dev->mmio_always_on) {
183 pci_read_config_word(dev, PCI_COMMAND, &orig_cmd);
184 if (orig_cmd & PCI_COMMAND_DECODE_ENABLE) {
185 pci_write_config_word(dev, PCI_COMMAND,
186 orig_cmd & ~PCI_COMMAND_DECODE_ENABLE);
190 res->name = pci_name(dev);
192 pci_read_config_dword(dev, pos, &l);
193 pci_write_config_dword(dev, pos, l | mask);
194 pci_read_config_dword(dev, pos, &sz);
195 pci_write_config_dword(dev, pos, l);
198 * All bits set in sz means the device isn't working properly.
199 * If the BAR isn't implemented, all bits must be 0. If it's a
200 * memory BAR or a ROM, bit 0 must be clear; if it's an io BAR, bit
203 if (sz == 0xffffffff)
207 * I don't know how l can have all bits set. Copied from old code.
208 * Maybe it fixes a bug on some ancient platform.
213 if (type == pci_bar_unknown) {
214 res->flags = decode_bar(dev, l);
215 res->flags |= IORESOURCE_SIZEALIGN;
216 if (res->flags & IORESOURCE_IO) {
217 l64 = l & PCI_BASE_ADDRESS_IO_MASK;
218 sz64 = sz & PCI_BASE_ADDRESS_IO_MASK;
219 mask64 = PCI_BASE_ADDRESS_IO_MASK & (u32)IO_SPACE_LIMIT;
221 l64 = l & PCI_BASE_ADDRESS_MEM_MASK;
222 sz64 = sz & PCI_BASE_ADDRESS_MEM_MASK;
223 mask64 = (u32)PCI_BASE_ADDRESS_MEM_MASK;
226 res->flags |= (l & IORESOURCE_ROM_ENABLE);
227 l64 = l & PCI_ROM_ADDRESS_MASK;
228 sz64 = sz & PCI_ROM_ADDRESS_MASK;
229 mask64 = (u32)PCI_ROM_ADDRESS_MASK;
232 if (res->flags & IORESOURCE_MEM_64) {
233 pci_read_config_dword(dev, pos + 4, &l);
234 pci_write_config_dword(dev, pos + 4, ~0);
235 pci_read_config_dword(dev, pos + 4, &sz);
236 pci_write_config_dword(dev, pos + 4, l);
238 l64 |= ((u64)l << 32);
239 sz64 |= ((u64)sz << 32);
240 mask64 |= ((u64)~0 << 32);
243 if (!dev->mmio_always_on && (orig_cmd & PCI_COMMAND_DECODE_ENABLE))
244 pci_write_config_word(dev, PCI_COMMAND, orig_cmd);
249 sz64 = pci_size(l64, sz64, mask64);
251 dev_info(&dev->dev, FW_BUG "reg 0x%x: invalid BAR (can't size)\n",
256 if (res->flags & IORESOURCE_MEM_64) {
257 if ((sizeof(pci_bus_addr_t) < 8 || sizeof(resource_size_t) < 8)
258 && sz64 > 0x100000000ULL) {
259 res->flags |= IORESOURCE_UNSET | IORESOURCE_DISABLED;
262 dev_err(&dev->dev, "reg 0x%x: can't handle BAR larger than 4GB (size %#010llx)\n",
263 pos, (unsigned long long)sz64);
267 if ((sizeof(pci_bus_addr_t) < 8) && l) {
268 /* Above 32-bit boundary; try to reallocate */
269 res->flags |= IORESOURCE_UNSET;
272 dev_info(&dev->dev, "reg 0x%x: can't handle BAR above 4GB (bus address %#010llx)\n",
273 pos, (unsigned long long)l64);
279 region.end = l64 + sz64;
281 pcibios_bus_to_resource(dev->bus, res, ®ion);
282 pcibios_resource_to_bus(dev->bus, &inverted_region, res);
285 * If "A" is a BAR value (a bus address), "bus_to_resource(A)" is
286 * the corresponding resource address (the physical address used by
287 * the CPU. Converting that resource address back to a bus address
288 * should yield the original BAR value:
290 * resource_to_bus(bus_to_resource(A)) == A
292 * If it doesn't, CPU accesses to "bus_to_resource(A)" will not
293 * be claimed by the device.
295 if (inverted_region.start != region.start) {
296 res->flags |= IORESOURCE_UNSET;
298 res->end = region.end - region.start;
299 dev_info(&dev->dev, "reg 0x%x: initial BAR value %#010llx invalid\n",
300 pos, (unsigned long long)region.start);
310 dev_printk(KERN_DEBUG, &dev->dev, "reg 0x%x: %pR\n", pos, res);
312 return (res->flags & IORESOURCE_MEM_64) ? 1 : 0;
315 static void pci_read_bases(struct pci_dev *dev, unsigned int howmany, int rom)
317 unsigned int pos, reg;
319 for (pos = 0; pos < howmany; pos++) {
320 struct resource *res = &dev->resource[pos];
321 reg = PCI_BASE_ADDRESS_0 + (pos << 2);
322 pos += __pci_read_base(dev, pci_bar_unknown, res, reg);
326 struct resource *res = &dev->resource[PCI_ROM_RESOURCE];
327 dev->rom_base_reg = rom;
328 res->flags = IORESOURCE_MEM | IORESOURCE_PREFETCH |
329 IORESOURCE_READONLY | IORESOURCE_SIZEALIGN;
330 __pci_read_base(dev, pci_bar_mem32, res, rom);
334 static void pci_read_bridge_io(struct pci_bus *child)
336 struct pci_dev *dev = child->self;
337 u8 io_base_lo, io_limit_lo;
338 unsigned long io_mask, io_granularity, base, limit;
339 struct pci_bus_region region;
340 struct resource *res;
342 io_mask = PCI_IO_RANGE_MASK;
343 io_granularity = 0x1000;
344 if (dev->io_window_1k) {
345 /* Support 1K I/O space granularity */
346 io_mask = PCI_IO_1K_RANGE_MASK;
347 io_granularity = 0x400;
350 res = child->resource[0];
351 pci_read_config_byte(dev, PCI_IO_BASE, &io_base_lo);
352 pci_read_config_byte(dev, PCI_IO_LIMIT, &io_limit_lo);
353 base = (io_base_lo & io_mask) << 8;
354 limit = (io_limit_lo & io_mask) << 8;
356 if ((io_base_lo & PCI_IO_RANGE_TYPE_MASK) == PCI_IO_RANGE_TYPE_32) {
357 u16 io_base_hi, io_limit_hi;
359 pci_read_config_word(dev, PCI_IO_BASE_UPPER16, &io_base_hi);
360 pci_read_config_word(dev, PCI_IO_LIMIT_UPPER16, &io_limit_hi);
361 base |= ((unsigned long) io_base_hi << 16);
362 limit |= ((unsigned long) io_limit_hi << 16);
366 res->flags = (io_base_lo & PCI_IO_RANGE_TYPE_MASK) | IORESOURCE_IO;
368 region.end = limit + io_granularity - 1;
369 pcibios_bus_to_resource(dev->bus, res, ®ion);
370 dev_printk(KERN_DEBUG, &dev->dev, " bridge window %pR\n", res);
374 static void pci_read_bridge_mmio(struct pci_bus *child)
376 struct pci_dev *dev = child->self;
377 u16 mem_base_lo, mem_limit_lo;
378 unsigned long base, limit;
379 struct pci_bus_region region;
380 struct resource *res;
382 res = child->resource[1];
383 pci_read_config_word(dev, PCI_MEMORY_BASE, &mem_base_lo);
384 pci_read_config_word(dev, PCI_MEMORY_LIMIT, &mem_limit_lo);
385 base = ((unsigned long) mem_base_lo & PCI_MEMORY_RANGE_MASK) << 16;
386 limit = ((unsigned long) mem_limit_lo & PCI_MEMORY_RANGE_MASK) << 16;
388 res->flags = (mem_base_lo & PCI_MEMORY_RANGE_TYPE_MASK) | IORESOURCE_MEM;
390 region.end = limit + 0xfffff;
391 pcibios_bus_to_resource(dev->bus, res, ®ion);
392 dev_printk(KERN_DEBUG, &dev->dev, " bridge window %pR\n", res);
396 static void pci_read_bridge_mmio_pref(struct pci_bus *child)
398 struct pci_dev *dev = child->self;
399 u16 mem_base_lo, mem_limit_lo;
401 pci_bus_addr_t base, limit;
402 struct pci_bus_region region;
403 struct resource *res;
405 res = child->resource[2];
406 pci_read_config_word(dev, PCI_PREF_MEMORY_BASE, &mem_base_lo);
407 pci_read_config_word(dev, PCI_PREF_MEMORY_LIMIT, &mem_limit_lo);
408 base64 = (mem_base_lo & PCI_PREF_RANGE_MASK) << 16;
409 limit64 = (mem_limit_lo & PCI_PREF_RANGE_MASK) << 16;
411 if ((mem_base_lo & PCI_PREF_RANGE_TYPE_MASK) == PCI_PREF_RANGE_TYPE_64) {
412 u32 mem_base_hi, mem_limit_hi;
414 pci_read_config_dword(dev, PCI_PREF_BASE_UPPER32, &mem_base_hi);
415 pci_read_config_dword(dev, PCI_PREF_LIMIT_UPPER32, &mem_limit_hi);
418 * Some bridges set the base > limit by default, and some
419 * (broken) BIOSes do not initialize them. If we find
420 * this, just assume they are not being used.
422 if (mem_base_hi <= mem_limit_hi) {
423 base64 |= (u64) mem_base_hi << 32;
424 limit64 |= (u64) mem_limit_hi << 32;
428 base = (pci_bus_addr_t) base64;
429 limit = (pci_bus_addr_t) limit64;
431 if (base != base64) {
432 dev_err(&dev->dev, "can't handle bridge window above 4GB (bus address %#010llx)\n",
433 (unsigned long long) base64);
438 res->flags = (mem_base_lo & PCI_PREF_RANGE_TYPE_MASK) |
439 IORESOURCE_MEM | IORESOURCE_PREFETCH;
440 if (res->flags & PCI_PREF_RANGE_TYPE_64)
441 res->flags |= IORESOURCE_MEM_64;
443 region.end = limit + 0xfffff;
444 pcibios_bus_to_resource(dev->bus, res, ®ion);
445 dev_printk(KERN_DEBUG, &dev->dev, " bridge window %pR\n", res);
449 void pci_read_bridge_bases(struct pci_bus *child)
451 struct pci_dev *dev = child->self;
452 struct resource *res;
455 if (pci_is_root_bus(child)) /* It's a host bus, nothing to read */
458 dev_info(&dev->dev, "PCI bridge to %pR%s\n",
460 dev->transparent ? " (subtractive decode)" : "");
462 pci_bus_remove_resources(child);
463 for (i = 0; i < PCI_BRIDGE_RESOURCE_NUM; i++)
464 child->resource[i] = &dev->resource[PCI_BRIDGE_RESOURCES+i];
466 pci_read_bridge_io(child);
467 pci_read_bridge_mmio(child);
468 pci_read_bridge_mmio_pref(child);
470 if (dev->transparent) {
471 pci_bus_for_each_resource(child->parent, res, i) {
472 if (res && res->flags) {
473 pci_bus_add_resource(child, res,
474 PCI_SUBTRACTIVE_DECODE);
475 dev_printk(KERN_DEBUG, &dev->dev,
476 " bridge window %pR (subtractive decode)\n",
483 static struct pci_bus *pci_alloc_bus(struct pci_bus *parent)
487 b = kzalloc(sizeof(*b), GFP_KERNEL);
491 INIT_LIST_HEAD(&b->node);
492 INIT_LIST_HEAD(&b->children);
493 INIT_LIST_HEAD(&b->devices);
494 INIT_LIST_HEAD(&b->slots);
495 INIT_LIST_HEAD(&b->resources);
496 b->max_bus_speed = PCI_SPEED_UNKNOWN;
497 b->cur_bus_speed = PCI_SPEED_UNKNOWN;
498 #ifdef CONFIG_PCI_DOMAINS_GENERIC
500 b->domain_nr = parent->domain_nr;
505 static void pci_release_host_bridge_dev(struct device *dev)
507 struct pci_host_bridge *bridge = to_pci_host_bridge(dev);
509 if (bridge->release_fn)
510 bridge->release_fn(bridge);
512 pci_free_resource_list(&bridge->windows);
517 static struct pci_host_bridge *pci_alloc_host_bridge(struct pci_bus *b)
519 struct pci_host_bridge *bridge;
521 bridge = kzalloc(sizeof(*bridge), GFP_KERNEL);
525 INIT_LIST_HEAD(&bridge->windows);
530 static const unsigned char pcix_bus_speed[] = {
531 PCI_SPEED_UNKNOWN, /* 0 */
532 PCI_SPEED_66MHz_PCIX, /* 1 */
533 PCI_SPEED_100MHz_PCIX, /* 2 */
534 PCI_SPEED_133MHz_PCIX, /* 3 */
535 PCI_SPEED_UNKNOWN, /* 4 */
536 PCI_SPEED_66MHz_PCIX_ECC, /* 5 */
537 PCI_SPEED_100MHz_PCIX_ECC, /* 6 */
538 PCI_SPEED_133MHz_PCIX_ECC, /* 7 */
539 PCI_SPEED_UNKNOWN, /* 8 */
540 PCI_SPEED_66MHz_PCIX_266, /* 9 */
541 PCI_SPEED_100MHz_PCIX_266, /* A */
542 PCI_SPEED_133MHz_PCIX_266, /* B */
543 PCI_SPEED_UNKNOWN, /* C */
544 PCI_SPEED_66MHz_PCIX_533, /* D */
545 PCI_SPEED_100MHz_PCIX_533, /* E */
546 PCI_SPEED_133MHz_PCIX_533 /* F */
549 const unsigned char pcie_link_speed[] = {
550 PCI_SPEED_UNKNOWN, /* 0 */
551 PCIE_SPEED_2_5GT, /* 1 */
552 PCIE_SPEED_5_0GT, /* 2 */
553 PCIE_SPEED_8_0GT, /* 3 */
554 PCI_SPEED_UNKNOWN, /* 4 */
555 PCI_SPEED_UNKNOWN, /* 5 */
556 PCI_SPEED_UNKNOWN, /* 6 */
557 PCI_SPEED_UNKNOWN, /* 7 */
558 PCI_SPEED_UNKNOWN, /* 8 */
559 PCI_SPEED_UNKNOWN, /* 9 */
560 PCI_SPEED_UNKNOWN, /* A */
561 PCI_SPEED_UNKNOWN, /* B */
562 PCI_SPEED_UNKNOWN, /* C */
563 PCI_SPEED_UNKNOWN, /* D */
564 PCI_SPEED_UNKNOWN, /* E */
565 PCI_SPEED_UNKNOWN /* F */
568 void pcie_update_link_speed(struct pci_bus *bus, u16 linksta)
570 bus->cur_bus_speed = pcie_link_speed[linksta & PCI_EXP_LNKSTA_CLS];
572 EXPORT_SYMBOL_GPL(pcie_update_link_speed);
574 static unsigned char agp_speeds[] = {
582 static enum pci_bus_speed agp_speed(int agp3, int agpstat)
588 else if (agpstat & 2)
590 else if (agpstat & 1)
602 return agp_speeds[index];
605 static void pci_set_bus_speed(struct pci_bus *bus)
607 struct pci_dev *bridge = bus->self;
610 pos = pci_find_capability(bridge, PCI_CAP_ID_AGP);
612 pos = pci_find_capability(bridge, PCI_CAP_ID_AGP3);
616 pci_read_config_dword(bridge, pos + PCI_AGP_STATUS, &agpstat);
617 bus->max_bus_speed = agp_speed(agpstat & 8, agpstat & 7);
619 pci_read_config_dword(bridge, pos + PCI_AGP_COMMAND, &agpcmd);
620 bus->cur_bus_speed = agp_speed(agpstat & 8, agpcmd & 7);
623 pos = pci_find_capability(bridge, PCI_CAP_ID_PCIX);
626 enum pci_bus_speed max;
628 pci_read_config_word(bridge, pos + PCI_X_BRIDGE_SSTATUS,
631 if (status & PCI_X_SSTATUS_533MHZ) {
632 max = PCI_SPEED_133MHz_PCIX_533;
633 } else if (status & PCI_X_SSTATUS_266MHZ) {
634 max = PCI_SPEED_133MHz_PCIX_266;
635 } else if (status & PCI_X_SSTATUS_133MHZ) {
636 if ((status & PCI_X_SSTATUS_VERS) == PCI_X_SSTATUS_V2)
637 max = PCI_SPEED_133MHz_PCIX_ECC;
639 max = PCI_SPEED_133MHz_PCIX;
641 max = PCI_SPEED_66MHz_PCIX;
644 bus->max_bus_speed = max;
645 bus->cur_bus_speed = pcix_bus_speed[
646 (status & PCI_X_SSTATUS_FREQ) >> 6];
651 if (pci_is_pcie(bridge)) {
655 pcie_capability_read_dword(bridge, PCI_EXP_LNKCAP, &linkcap);
656 bus->max_bus_speed = pcie_link_speed[linkcap & PCI_EXP_LNKCAP_SLS];
658 pcie_capability_read_word(bridge, PCI_EXP_LNKSTA, &linksta);
659 pcie_update_link_speed(bus, linksta);
663 static struct irq_domain *pci_host_bridge_msi_domain(struct pci_bus *bus)
665 struct irq_domain *d;
668 * Any firmware interface that can resolve the msi_domain
669 * should be called from here.
671 d = pci_host_bridge_of_msi_domain(bus);
676 static void pci_set_bus_msi_domain(struct pci_bus *bus)
678 struct irq_domain *d;
682 * The bus can be a root bus, a subordinate bus, or a virtual bus
683 * created by an SR-IOV device. Walk up to the first bridge device
684 * found or derive the domain from the host bridge.
686 for (b = bus, d = NULL; !d && !pci_is_root_bus(b); b = b->parent) {
688 d = dev_get_msi_domain(&b->self->dev);
692 d = pci_host_bridge_msi_domain(b);
694 dev_set_msi_domain(&bus->dev, d);
697 static struct pci_bus *pci_alloc_child_bus(struct pci_bus *parent,
698 struct pci_dev *bridge, int busnr)
700 struct pci_bus *child;
705 * Allocate a new bus, and inherit stuff from the parent..
707 child = pci_alloc_bus(parent);
711 child->parent = parent;
712 child->ops = parent->ops;
713 child->msi = parent->msi;
714 child->sysdata = parent->sysdata;
715 child->bus_flags = parent->bus_flags;
717 /* initialize some portions of the bus device, but don't register it
718 * now as the parent is not properly set up yet.
720 child->dev.class = &pcibus_class;
721 dev_set_name(&child->dev, "%04x:%02x", pci_domain_nr(child), busnr);
724 * Set up the primary, secondary and subordinate
727 child->number = child->busn_res.start = busnr;
728 child->primary = parent->busn_res.start;
729 child->busn_res.end = 0xff;
732 child->dev.parent = parent->bridge;
736 child->self = bridge;
737 child->bridge = get_device(&bridge->dev);
738 child->dev.parent = child->bridge;
739 pci_set_bus_of_node(child);
740 pci_set_bus_speed(child);
742 /* Set up default resource pointers and names.. */
743 for (i = 0; i < PCI_BRIDGE_RESOURCE_NUM; i++) {
744 child->resource[i] = &bridge->resource[PCI_BRIDGE_RESOURCES+i];
745 child->resource[i]->name = child->name;
747 bridge->subordinate = child;
750 pci_set_bus_msi_domain(child);
751 ret = device_register(&child->dev);
754 pcibios_add_bus(child);
756 /* Create legacy_io and legacy_mem files for this bus */
757 pci_create_legacy_files(child);
762 struct pci_bus *pci_add_new_bus(struct pci_bus *parent, struct pci_dev *dev,
765 struct pci_bus *child;
767 child = pci_alloc_child_bus(parent, dev, busnr);
769 down_write(&pci_bus_sem);
770 list_add_tail(&child->node, &parent->children);
771 up_write(&pci_bus_sem);
775 EXPORT_SYMBOL(pci_add_new_bus);
777 static void pci_enable_crs(struct pci_dev *pdev)
781 /* Enable CRS Software Visibility if supported */
782 pcie_capability_read_word(pdev, PCI_EXP_RTCAP, &root_cap);
783 if (root_cap & PCI_EXP_RTCAP_CRSVIS)
784 pcie_capability_set_word(pdev, PCI_EXP_RTCTL,
785 PCI_EXP_RTCTL_CRSSVE);
789 * If it's a bridge, configure it and scan the bus behind it.
790 * For CardBus bridges, we don't scan behind as the devices will
791 * be handled by the bridge driver itself.
793 * We need to process bridges in two passes -- first we scan those
794 * already configured by the BIOS and after we are done with all of
795 * them, we proceed to assigning numbers to the remaining buses in
796 * order to avoid overlaps between old and new bus numbers.
798 int pci_scan_bridge(struct pci_bus *bus, struct pci_dev *dev, int max, int pass)
800 struct pci_bus *child;
801 int is_cardbus = (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS);
804 u8 primary, secondary, subordinate;
807 pci_read_config_dword(dev, PCI_PRIMARY_BUS, &buses);
808 primary = buses & 0xFF;
809 secondary = (buses >> 8) & 0xFF;
810 subordinate = (buses >> 16) & 0xFF;
812 dev_dbg(&dev->dev, "scanning [bus %02x-%02x] behind bridge, pass %d\n",
813 secondary, subordinate, pass);
815 if (!primary && (primary != bus->number) && secondary && subordinate) {
816 dev_warn(&dev->dev, "Primary bus is hard wired to 0\n");
817 primary = bus->number;
820 /* Check if setup is sensible at all */
822 (primary != bus->number || secondary <= bus->number ||
823 secondary > subordinate)) {
824 dev_info(&dev->dev, "bridge configuration invalid ([bus %02x-%02x]), reconfiguring\n",
825 secondary, subordinate);
829 /* Disable MasterAbortMode during probing to avoid reporting
830 of bus errors (in some architectures) */
831 pci_read_config_word(dev, PCI_BRIDGE_CONTROL, &bctl);
832 pci_write_config_word(dev, PCI_BRIDGE_CONTROL,
833 bctl & ~PCI_BRIDGE_CTL_MASTER_ABORT);
837 if ((secondary || subordinate) && !pcibios_assign_all_busses() &&
838 !is_cardbus && !broken) {
841 * Bus already configured by firmware, process it in the first
842 * pass and just note the configuration.
848 * The bus might already exist for two reasons: Either we are
849 * rescanning the bus or the bus is reachable through more than
850 * one bridge. The second case can happen with the i450NX
853 child = pci_find_bus(pci_domain_nr(bus), secondary);
855 child = pci_add_new_bus(bus, dev, secondary);
858 child->primary = primary;
859 pci_bus_insert_busn_res(child, secondary, subordinate);
860 child->bridge_ctl = bctl;
863 cmax = pci_scan_child_bus(child);
864 if (cmax > subordinate)
865 dev_warn(&dev->dev, "bridge has subordinate %02x but max busn %02x\n",
867 /* subordinate should equal child->busn_res.end */
868 if (subordinate > max)
872 * We need to assign a number to this bus which we always
873 * do in the second pass.
876 if (pcibios_assign_all_busses() || broken || is_cardbus)
877 /* Temporarily disable forwarding of the
878 configuration cycles on all bridges in
879 this bus segment to avoid possible
880 conflicts in the second pass between two
881 bridges programmed with overlapping
883 pci_write_config_dword(dev, PCI_PRIMARY_BUS,
889 pci_write_config_word(dev, PCI_STATUS, 0xffff);
891 /* Prevent assigning a bus number that already exists.
892 * This can happen when a bridge is hot-plugged, so in
893 * this case we only re-scan this bus. */
894 child = pci_find_bus(pci_domain_nr(bus), max+1);
896 child = pci_add_new_bus(bus, dev, max+1);
899 pci_bus_insert_busn_res(child, max+1, 0xff);
902 buses = (buses & 0xff000000)
903 | ((unsigned int)(child->primary) << 0)
904 | ((unsigned int)(child->busn_res.start) << 8)
905 | ((unsigned int)(child->busn_res.end) << 16);
908 * yenta.c forces a secondary latency timer of 176.
909 * Copy that behaviour here.
912 buses &= ~0xff000000;
913 buses |= CARDBUS_LATENCY_TIMER << 24;
917 * We need to blast all three values with a single write.
919 pci_write_config_dword(dev, PCI_PRIMARY_BUS, buses);
922 child->bridge_ctl = bctl;
923 max = pci_scan_child_bus(child);
926 * For CardBus bridges, we leave 4 bus numbers
927 * as cards with a PCI-to-PCI bridge can be
930 for (i = 0; i < CARDBUS_RESERVE_BUSNR; i++) {
931 struct pci_bus *parent = bus;
932 if (pci_find_bus(pci_domain_nr(bus),
935 while (parent->parent) {
936 if ((!pcibios_assign_all_busses()) &&
937 (parent->busn_res.end > max) &&
938 (parent->busn_res.end <= max+i)) {
941 parent = parent->parent;
945 * Often, there are two cardbus bridges
946 * -- try to leave one valid bus number
956 * Set the subordinate bus number to its real value.
958 pci_bus_update_busn_res_end(child, max);
959 pci_write_config_byte(dev, PCI_SUBORDINATE_BUS, max);
963 (is_cardbus ? "PCI CardBus %04x:%02x" : "PCI Bus %04x:%02x"),
964 pci_domain_nr(bus), child->number);
966 /* Has only triggered on CardBus, fixup is in yenta_socket */
967 while (bus->parent) {
968 if ((child->busn_res.end > bus->busn_res.end) ||
969 (child->number > bus->busn_res.end) ||
970 (child->number < bus->number) ||
971 (child->busn_res.end < bus->number)) {
972 dev_info(&child->dev, "%pR %s hidden behind%s bridge %s %pR\n",
974 (bus->number > child->busn_res.end &&
975 bus->busn_res.end < child->number) ?
976 "wholly" : "partially",
977 bus->self->transparent ? " transparent" : "",
985 pci_write_config_word(dev, PCI_BRIDGE_CONTROL, bctl);
989 EXPORT_SYMBOL(pci_scan_bridge);
992 * Read interrupt line and base address registers.
993 * The architecture-dependent code can tweak these, of course.
995 static void pci_read_irq(struct pci_dev *dev)
999 pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &irq);
1002 pci_read_config_byte(dev, PCI_INTERRUPT_LINE, &irq);
1006 void set_pcie_port_type(struct pci_dev *pdev)
1011 struct pci_dev *parent;
1013 pos = pci_find_capability(pdev, PCI_CAP_ID_EXP);
1016 pdev->pcie_cap = pos;
1017 pci_read_config_word(pdev, pos + PCI_EXP_FLAGS, ®16);
1018 pdev->pcie_flags_reg = reg16;
1019 pci_read_config_word(pdev, pos + PCI_EXP_DEVCAP, ®16);
1020 pdev->pcie_mpss = reg16 & PCI_EXP_DEVCAP_PAYLOAD;
1023 * A Root Port is always the upstream end of a Link. No PCIe
1024 * component has two Links. Two Links are connected by a Switch
1025 * that has a Port on each Link and internal logic to connect the
1028 type = pci_pcie_type(pdev);
1029 if (type == PCI_EXP_TYPE_ROOT_PORT)
1030 pdev->has_secondary_link = 1;
1031 else if (type == PCI_EXP_TYPE_UPSTREAM ||
1032 type == PCI_EXP_TYPE_DOWNSTREAM) {
1033 parent = pci_upstream_bridge(pdev);
1036 * Usually there's an upstream device (Root Port or Switch
1037 * Downstream Port), but we can't assume one exists.
1039 if (parent && !parent->has_secondary_link)
1040 pdev->has_secondary_link = 1;
1044 void set_pcie_hotplug_bridge(struct pci_dev *pdev)
1048 pcie_capability_read_dword(pdev, PCI_EXP_SLTCAP, ®32);
1049 if (reg32 & PCI_EXP_SLTCAP_HPC)
1050 pdev->is_hotplug_bridge = 1;
1054 * pci_ext_cfg_is_aliased - is ext config space just an alias of std config?
1057 * PCI Express to PCI/PCI-X Bridge Specification, rev 1.0, 4.1.4 says that
1058 * when forwarding a type1 configuration request the bridge must check that
1059 * the extended register address field is zero. The bridge is not permitted
1060 * to forward the transactions and must handle it as an Unsupported Request.
1061 * Some bridges do not follow this rule and simply drop the extended register
1062 * bits, resulting in the standard config space being aliased, every 256
1063 * bytes across the entire configuration space. Test for this condition by
1064 * comparing the first dword of each potential alias to the vendor/device ID.
1066 * ASM1083/1085 PCIe-to-PCI Reversible Bridge (1b21:1080, rev 01 & 03)
1067 * AMD/ATI SBx00 PCI to PCI Bridge (1002:4384, rev 40)
1069 static bool pci_ext_cfg_is_aliased(struct pci_dev *dev)
1071 #ifdef CONFIG_PCI_QUIRKS
1075 pci_read_config_dword(dev, PCI_VENDOR_ID, &header);
1077 for (pos = PCI_CFG_SPACE_SIZE;
1078 pos < PCI_CFG_SPACE_EXP_SIZE; pos += PCI_CFG_SPACE_SIZE) {
1079 if (pci_read_config_dword(dev, pos, &tmp) != PCIBIOS_SUCCESSFUL
1091 * pci_cfg_space_size - get the configuration space size of the PCI device.
1094 * Regular PCI devices have 256 bytes, but PCI-X 2 and PCI Express devices
1095 * have 4096 bytes. Even if the device is capable, that doesn't mean we can
1096 * access it. Maybe we don't have a way to generate extended config space
1097 * accesses, or the device is behind a reverse Express bridge. So we try
1098 * reading the dword at 0x100 which must either be 0 or a valid extended
1099 * capability header.
1101 static int pci_cfg_space_size_ext(struct pci_dev *dev)
1104 int pos = PCI_CFG_SPACE_SIZE;
1106 if (pci_read_config_dword(dev, pos, &status) != PCIBIOS_SUCCESSFUL)
1108 if (status == 0xffffffff || pci_ext_cfg_is_aliased(dev))
1111 return PCI_CFG_SPACE_EXP_SIZE;
1114 return PCI_CFG_SPACE_SIZE;
1117 int pci_cfg_space_size(struct pci_dev *dev)
1123 class = dev->class >> 8;
1124 if (class == PCI_CLASS_BRIDGE_HOST)
1125 return pci_cfg_space_size_ext(dev);
1127 if (!pci_is_pcie(dev)) {
1128 pos = pci_find_capability(dev, PCI_CAP_ID_PCIX);
1132 pci_read_config_dword(dev, pos + PCI_X_STATUS, &status);
1133 if (!(status & (PCI_X_STATUS_266MHZ | PCI_X_STATUS_533MHZ)))
1137 return pci_cfg_space_size_ext(dev);
1140 return PCI_CFG_SPACE_SIZE;
1143 #define LEGACY_IO_RESOURCE (IORESOURCE_IO | IORESOURCE_PCI_FIXED)
1145 void pci_msi_setup_pci_dev(struct pci_dev *dev)
1148 * Disable the MSI hardware to avoid screaming interrupts
1149 * during boot. This is the power on reset default so
1150 * usually this should be a noop.
1152 dev->msi_cap = pci_find_capability(dev, PCI_CAP_ID_MSI);
1154 pci_msi_set_enable(dev, 0);
1156 dev->msix_cap = pci_find_capability(dev, PCI_CAP_ID_MSIX);
1158 pci_msix_clear_and_set_ctrl(dev, PCI_MSIX_FLAGS_ENABLE, 0);
1162 * pci_setup_device - fill in class and map information of a device
1163 * @dev: the device structure to fill
1165 * Initialize the device structure with information about the device's
1166 * vendor,class,memory and IO-space addresses,IRQ lines etc.
1167 * Called at initialisation of the PCI subsystem and by CardBus services.
1168 * Returns 0 on success and negative if unknown type of device (not normal,
1169 * bridge or CardBus).
1171 int pci_setup_device(struct pci_dev *dev)
1176 struct pci_bus_region region;
1177 struct resource *res;
1179 if (pci_read_config_byte(dev, PCI_HEADER_TYPE, &hdr_type))
1182 dev->sysdata = dev->bus->sysdata;
1183 dev->dev.parent = dev->bus->bridge;
1184 dev->dev.bus = &pci_bus_type;
1185 dev->hdr_type = hdr_type & 0x7f;
1186 dev->multifunction = !!(hdr_type & 0x80);
1187 dev->error_state = pci_channel_io_normal;
1188 set_pcie_port_type(dev);
1190 pci_dev_assign_slot(dev);
1191 /* Assume 32-bit PCI; let 64-bit PCI cards (which are far rarer)
1192 set this higher, assuming the system even supports it. */
1193 dev->dma_mask = 0xffffffff;
1195 dev_set_name(&dev->dev, "%04x:%02x:%02x.%d", pci_domain_nr(dev->bus),
1196 dev->bus->number, PCI_SLOT(dev->devfn),
1197 PCI_FUNC(dev->devfn));
1199 pci_read_config_dword(dev, PCI_CLASS_REVISION, &class);
1200 dev->revision = class & 0xff;
1201 dev->class = class >> 8; /* upper 3 bytes */
1203 dev_printk(KERN_DEBUG, &dev->dev, "[%04x:%04x] type %02x class %#08x\n",
1204 dev->vendor, dev->device, dev->hdr_type, dev->class);
1206 /* need to have dev->class ready */
1207 dev->cfg_size = pci_cfg_space_size(dev);
1209 /* "Unknown power state" */
1210 dev->current_state = PCI_UNKNOWN;
1212 pci_msi_setup_pci_dev(dev);
1214 /* Early fixups, before probing the BARs */
1215 pci_fixup_device(pci_fixup_early, dev);
1216 /* device class may be changed after fixup */
1217 class = dev->class >> 8;
1219 switch (dev->hdr_type) { /* header type */
1220 case PCI_HEADER_TYPE_NORMAL: /* standard header */
1221 if (class == PCI_CLASS_BRIDGE_PCI)
1224 pci_read_bases(dev, 6, PCI_ROM_ADDRESS);
1225 pci_read_config_word(dev, PCI_SUBSYSTEM_VENDOR_ID, &dev->subsystem_vendor);
1226 pci_read_config_word(dev, PCI_SUBSYSTEM_ID, &dev->subsystem_device);
1229 * Do the ugly legacy mode stuff here rather than broken chip
1230 * quirk code. Legacy mode ATA controllers have fixed
1231 * addresses. These are not always echoed in BAR0-3, and
1232 * BAR0-3 in a few cases contain junk!
1234 if (class == PCI_CLASS_STORAGE_IDE) {
1236 pci_read_config_byte(dev, PCI_CLASS_PROG, &progif);
1237 if ((progif & 1) == 0) {
1238 region.start = 0x1F0;
1240 res = &dev->resource[0];
1241 res->flags = LEGACY_IO_RESOURCE;
1242 pcibios_bus_to_resource(dev->bus, res, ®ion);
1243 dev_info(&dev->dev, "legacy IDE quirk: reg 0x10: %pR\n",
1245 region.start = 0x3F6;
1247 res = &dev->resource[1];
1248 res->flags = LEGACY_IO_RESOURCE;
1249 pcibios_bus_to_resource(dev->bus, res, ®ion);
1250 dev_info(&dev->dev, "legacy IDE quirk: reg 0x14: %pR\n",
1253 if ((progif & 4) == 0) {
1254 region.start = 0x170;
1256 res = &dev->resource[2];
1257 res->flags = LEGACY_IO_RESOURCE;
1258 pcibios_bus_to_resource(dev->bus, res, ®ion);
1259 dev_info(&dev->dev, "legacy IDE quirk: reg 0x18: %pR\n",
1261 region.start = 0x376;
1263 res = &dev->resource[3];
1264 res->flags = LEGACY_IO_RESOURCE;
1265 pcibios_bus_to_resource(dev->bus, res, ®ion);
1266 dev_info(&dev->dev, "legacy IDE quirk: reg 0x1c: %pR\n",
1272 case PCI_HEADER_TYPE_BRIDGE: /* bridge header */
1273 if (class != PCI_CLASS_BRIDGE_PCI)
1275 /* The PCI-to-PCI bridge spec requires that subtractive
1276 decoding (i.e. transparent) bridge must have programming
1277 interface code of 0x01. */
1279 dev->transparent = ((dev->class & 0xff) == 1);
1280 pci_read_bases(dev, 2, PCI_ROM_ADDRESS1);
1281 set_pcie_hotplug_bridge(dev);
1282 pos = pci_find_capability(dev, PCI_CAP_ID_SSVID);
1284 pci_read_config_word(dev, pos + PCI_SSVID_VENDOR_ID, &dev->subsystem_vendor);
1285 pci_read_config_word(dev, pos + PCI_SSVID_DEVICE_ID, &dev->subsystem_device);
1289 case PCI_HEADER_TYPE_CARDBUS: /* CardBus bridge header */
1290 if (class != PCI_CLASS_BRIDGE_CARDBUS)
1293 pci_read_bases(dev, 1, 0);
1294 pci_read_config_word(dev, PCI_CB_SUBSYSTEM_VENDOR_ID, &dev->subsystem_vendor);
1295 pci_read_config_word(dev, PCI_CB_SUBSYSTEM_ID, &dev->subsystem_device);
1298 default: /* unknown header */
1299 dev_err(&dev->dev, "unknown header type %02x, ignoring device\n",
1304 dev_err(&dev->dev, "ignoring class %#08x (doesn't match header type %02x)\n",
1305 dev->class, dev->hdr_type);
1306 dev->class = PCI_CLASS_NOT_DEFINED << 8;
1309 /* We found a fine healthy device, go go go... */
1313 static void pci_configure_mps(struct pci_dev *dev)
1315 struct pci_dev *bridge = pci_upstream_bridge(dev);
1318 if (!pci_is_pcie(dev) || !bridge || !pci_is_pcie(bridge))
1321 mps = pcie_get_mps(dev);
1322 p_mps = pcie_get_mps(bridge);
1327 if (pcie_bus_config == PCIE_BUS_TUNE_OFF) {
1328 dev_warn(&dev->dev, "Max Payload Size %d, but upstream %s set to %d; if necessary, use \"pci=pcie_bus_safe\" and report a bug\n",
1329 mps, pci_name(bridge), p_mps);
1334 * Fancier MPS configuration is done later by
1335 * pcie_bus_configure_settings()
1337 if (pcie_bus_config != PCIE_BUS_DEFAULT)
1340 rc = pcie_set_mps(dev, p_mps);
1342 dev_warn(&dev->dev, "can't set Max Payload Size to %d; if necessary, use \"pci=pcie_bus_safe\" and report a bug\n",
1347 dev_info(&dev->dev, "Max Payload Size set to %d (was %d, max %d)\n",
1348 p_mps, mps, 128 << dev->pcie_mpss);
1351 static struct hpp_type0 pci_default_type0 = {
1353 .cache_line_size = 8,
1354 .latency_timer = 0x40,
1359 static void program_hpp_type0(struct pci_dev *dev, struct hpp_type0 *hpp)
1361 u16 pci_cmd, pci_bctl;
1364 hpp = &pci_default_type0;
1366 if (hpp->revision > 1) {
1368 "PCI settings rev %d not supported; using defaults\n",
1370 hpp = &pci_default_type0;
1373 pci_write_config_byte(dev, PCI_CACHE_LINE_SIZE, hpp->cache_line_size);
1374 pci_write_config_byte(dev, PCI_LATENCY_TIMER, hpp->latency_timer);
1375 pci_read_config_word(dev, PCI_COMMAND, &pci_cmd);
1376 if (hpp->enable_serr)
1377 pci_cmd |= PCI_COMMAND_SERR;
1378 if (hpp->enable_perr)
1379 pci_cmd |= PCI_COMMAND_PARITY;
1380 pci_write_config_word(dev, PCI_COMMAND, pci_cmd);
1382 /* Program bridge control value */
1383 if ((dev->class >> 8) == PCI_CLASS_BRIDGE_PCI) {
1384 pci_write_config_byte(dev, PCI_SEC_LATENCY_TIMER,
1385 hpp->latency_timer);
1386 pci_read_config_word(dev, PCI_BRIDGE_CONTROL, &pci_bctl);
1387 if (hpp->enable_serr)
1388 pci_bctl |= PCI_BRIDGE_CTL_SERR;
1389 if (hpp->enable_perr)
1390 pci_bctl |= PCI_BRIDGE_CTL_PARITY;
1391 pci_write_config_word(dev, PCI_BRIDGE_CONTROL, pci_bctl);
1395 static void program_hpp_type1(struct pci_dev *dev, struct hpp_type1 *hpp)
1398 dev_warn(&dev->dev, "PCI-X settings not supported\n");
1401 static void program_hpp_type2(struct pci_dev *dev, struct hpp_type2 *hpp)
1409 if (hpp->revision > 1) {
1410 dev_warn(&dev->dev, "PCIe settings rev %d not supported\n",
1416 * Don't allow _HPX to change MPS or MRRS settings. We manage
1417 * those to make sure they're consistent with the rest of the
1420 hpp->pci_exp_devctl_and |= PCI_EXP_DEVCTL_PAYLOAD |
1421 PCI_EXP_DEVCTL_READRQ;
1422 hpp->pci_exp_devctl_or &= ~(PCI_EXP_DEVCTL_PAYLOAD |
1423 PCI_EXP_DEVCTL_READRQ);
1425 /* Initialize Device Control Register */
1426 pcie_capability_clear_and_set_word(dev, PCI_EXP_DEVCTL,
1427 ~hpp->pci_exp_devctl_and, hpp->pci_exp_devctl_or);
1429 /* Initialize Link Control Register */
1430 if (pcie_cap_has_lnkctl(dev))
1431 pcie_capability_clear_and_set_word(dev, PCI_EXP_LNKCTL,
1432 ~hpp->pci_exp_lnkctl_and, hpp->pci_exp_lnkctl_or);
1434 /* Find Advanced Error Reporting Enhanced Capability */
1435 pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ERR);
1439 /* Initialize Uncorrectable Error Mask Register */
1440 pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_MASK, ®32);
1441 reg32 = (reg32 & hpp->unc_err_mask_and) | hpp->unc_err_mask_or;
1442 pci_write_config_dword(dev, pos + PCI_ERR_UNCOR_MASK, reg32);
1444 /* Initialize Uncorrectable Error Severity Register */
1445 pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_SEVER, ®32);
1446 reg32 = (reg32 & hpp->unc_err_sever_and) | hpp->unc_err_sever_or;
1447 pci_write_config_dword(dev, pos + PCI_ERR_UNCOR_SEVER, reg32);
1449 /* Initialize Correctable Error Mask Register */
1450 pci_read_config_dword(dev, pos + PCI_ERR_COR_MASK, ®32);
1451 reg32 = (reg32 & hpp->cor_err_mask_and) | hpp->cor_err_mask_or;
1452 pci_write_config_dword(dev, pos + PCI_ERR_COR_MASK, reg32);
1454 /* Initialize Advanced Error Capabilities and Control Register */
1455 pci_read_config_dword(dev, pos + PCI_ERR_CAP, ®32);
1456 reg32 = (reg32 & hpp->adv_err_cap_and) | hpp->adv_err_cap_or;
1457 pci_write_config_dword(dev, pos + PCI_ERR_CAP, reg32);
1460 * FIXME: The following two registers are not supported yet.
1462 * o Secondary Uncorrectable Error Severity Register
1463 * o Secondary Uncorrectable Error Mask Register
1467 static void pci_configure_device(struct pci_dev *dev)
1469 struct hotplug_params hpp;
1472 pci_configure_mps(dev);
1474 memset(&hpp, 0, sizeof(hpp));
1475 ret = pci_get_hp_params(dev, &hpp);
1479 program_hpp_type2(dev, hpp.t2);
1480 program_hpp_type1(dev, hpp.t1);
1481 program_hpp_type0(dev, hpp.t0);
1484 static void pci_release_capabilities(struct pci_dev *dev)
1486 pci_vpd_release(dev);
1487 pci_iov_release(dev);
1488 pci_free_cap_save_buffers(dev);
1492 * pci_release_dev - free a pci device structure when all users of it are finished.
1493 * @dev: device that's been disconnected
1495 * Will be called only by the device core when all users of this pci device are
1498 static void pci_release_dev(struct device *dev)
1500 struct pci_dev *pci_dev;
1502 pci_dev = to_pci_dev(dev);
1503 pci_release_capabilities(pci_dev);
1504 pci_release_of_node(pci_dev);
1505 pcibios_release_device(pci_dev);
1506 pci_bus_put(pci_dev->bus);
1507 kfree(pci_dev->driver_override);
1511 struct pci_dev *pci_alloc_dev(struct pci_bus *bus)
1513 struct pci_dev *dev;
1515 dev = kzalloc(sizeof(struct pci_dev), GFP_KERNEL);
1519 INIT_LIST_HEAD(&dev->bus_list);
1520 dev->dev.type = &pci_dev_type;
1521 dev->bus = pci_bus_get(bus);
1525 EXPORT_SYMBOL(pci_alloc_dev);
1527 bool pci_bus_read_dev_vendor_id(struct pci_bus *bus, int devfn, u32 *l,
1532 if (pci_bus_read_config_dword(bus, devfn, PCI_VENDOR_ID, l))
1535 /* some broken boards return 0 or ~0 if a slot is empty: */
1536 if (*l == 0xffffffff || *l == 0x00000000 ||
1537 *l == 0x0000ffff || *l == 0xffff0000)
1541 * Configuration Request Retry Status. Some root ports return the
1542 * actual device ID instead of the synthetic ID (0xFFFF) required
1543 * by the PCIe spec. Ignore the device ID and only check for
1546 while ((*l & 0xffff) == 0x0001) {
1552 if (pci_bus_read_config_dword(bus, devfn, PCI_VENDOR_ID, l))
1554 /* Card hasn't responded in 60 seconds? Must be stuck. */
1555 if (delay > crs_timeout) {
1556 printk(KERN_WARNING "pci %04x:%02x:%02x.%d: not responding\n",
1557 pci_domain_nr(bus), bus->number, PCI_SLOT(devfn),
1565 EXPORT_SYMBOL(pci_bus_read_dev_vendor_id);
1568 * Read the config data for a PCI device, sanity-check it
1569 * and fill in the dev structure...
1571 static struct pci_dev *pci_scan_device(struct pci_bus *bus, int devfn)
1573 struct pci_dev *dev;
1576 if (!pci_bus_read_dev_vendor_id(bus, devfn, &l, 60*1000))
1579 dev = pci_alloc_dev(bus);
1584 dev->vendor = l & 0xffff;
1585 dev->device = (l >> 16) & 0xffff;
1587 pci_set_of_node(dev);
1589 if (pci_setup_device(dev)) {
1590 pci_bus_put(dev->bus);
1598 static void pci_init_capabilities(struct pci_dev *dev)
1600 /* MSI/MSI-X list */
1601 pci_msi_init_pci_dev(dev);
1603 /* Buffers for saving PCIe and PCI-X capabilities */
1604 pci_allocate_cap_save_buffers(dev);
1606 /* Power Management */
1609 /* Vital Product Data */
1610 pci_vpd_pci22_init(dev);
1612 /* Alternative Routing-ID Forwarding */
1613 pci_configure_ari(dev);
1615 /* Single Root I/O Virtualization */
1618 /* Address Translation Services */
1621 /* Enable ACS P2P upstream forwarding */
1622 pci_enable_acs(dev);
1626 * This is the equivalent of pci_host_bridge_msi_domain that acts on
1627 * devices. Firmware interfaces that can select the MSI domain on a
1628 * per-device basis should be called from here.
1630 static struct irq_domain *pci_dev_msi_domain(struct pci_dev *dev)
1632 struct irq_domain *d;
1635 * If a domain has been set through the pcibios_add_device
1636 * callback, then this is the one (platform code knows best).
1638 d = dev_get_msi_domain(&dev->dev);
1643 * Let's see if we have a firmware interface able to provide
1646 d = pci_msi_get_device_domain(dev);
1653 static void pci_set_msi_domain(struct pci_dev *dev)
1655 struct irq_domain *d;
1658 * If the platform or firmware interfaces cannot supply a
1659 * device-specific MSI domain, then inherit the default domain
1660 * from the host bridge itself.
1662 d = pci_dev_msi_domain(dev);
1664 d = dev_get_msi_domain(&dev->bus->dev);
1666 dev_set_msi_domain(&dev->dev, d);
1669 void pci_device_add(struct pci_dev *dev, struct pci_bus *bus)
1673 pci_configure_device(dev);
1675 device_initialize(&dev->dev);
1676 dev->dev.release = pci_release_dev;
1678 set_dev_node(&dev->dev, pcibus_to_node(bus));
1679 dev->dev.dma_mask = &dev->dma_mask;
1680 dev->dev.dma_parms = &dev->dma_parms;
1681 dev->dev.coherent_dma_mask = 0xffffffffull;
1682 of_pci_dma_configure(dev);
1684 pci_set_dma_max_seg_size(dev, 65536);
1685 pci_set_dma_seg_boundary(dev, 0xffffffff);
1687 /* Fix up broken headers */
1688 pci_fixup_device(pci_fixup_header, dev);
1690 /* moved out from quirk header fixup code */
1691 pci_reassigndev_resource_alignment(dev);
1693 /* Clear the state_saved flag. */
1694 dev->state_saved = false;
1696 /* Initialize various capabilities */
1697 pci_init_capabilities(dev);
1700 * Add the device to our list of discovered devices
1701 * and the bus list for fixup functions, etc.
1703 down_write(&pci_bus_sem);
1704 list_add_tail(&dev->bus_list, &bus->devices);
1705 up_write(&pci_bus_sem);
1707 ret = pcibios_add_device(dev);
1710 /* Setup MSI irq domain */
1711 pci_set_msi_domain(dev);
1713 /* Notifier could use PCI capabilities */
1714 dev->match_driver = false;
1715 ret = device_add(&dev->dev);
1719 struct pci_dev *pci_scan_single_device(struct pci_bus *bus, int devfn)
1721 struct pci_dev *dev;
1723 dev = pci_get_slot(bus, devfn);
1729 dev = pci_scan_device(bus, devfn);
1733 pci_device_add(dev, bus);
1737 EXPORT_SYMBOL(pci_scan_single_device);
1739 static unsigned next_fn(struct pci_bus *bus, struct pci_dev *dev, unsigned fn)
1745 if (pci_ari_enabled(bus)) {
1748 pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ARI);
1752 pci_read_config_word(dev, pos + PCI_ARI_CAP, &cap);
1753 next_fn = PCI_ARI_CAP_NFN(cap);
1755 return 0; /* protect against malformed list */
1760 /* dev may be NULL for non-contiguous multifunction devices */
1761 if (!dev || dev->multifunction)
1762 return (fn + 1) % 8;
1767 static int only_one_child(struct pci_bus *bus)
1769 struct pci_dev *parent = bus->self;
1771 if (!parent || !pci_is_pcie(parent))
1773 if (pci_pcie_type(parent) == PCI_EXP_TYPE_ROOT_PORT)
1775 if (parent->has_secondary_link &&
1776 !pci_has_flag(PCI_SCAN_ALL_PCIE_DEVS))
1782 * pci_scan_slot - scan a PCI slot on a bus for devices.
1783 * @bus: PCI bus to scan
1784 * @devfn: slot number to scan (must have zero function.)
1786 * Scan a PCI slot on the specified PCI bus for devices, adding
1787 * discovered devices to the @bus->devices list. New devices
1788 * will not have is_added set.
1790 * Returns the number of new devices found.
1792 int pci_scan_slot(struct pci_bus *bus, int devfn)
1794 unsigned fn, nr = 0;
1795 struct pci_dev *dev;
1797 if (only_one_child(bus) && (devfn > 0))
1798 return 0; /* Already scanned the entire slot */
1800 dev = pci_scan_single_device(bus, devfn);
1806 for (fn = next_fn(bus, dev, 0); fn > 0; fn = next_fn(bus, dev, fn)) {
1807 dev = pci_scan_single_device(bus, devfn + fn);
1811 dev->multifunction = 1;
1815 /* only one slot has pcie device */
1816 if (bus->self && nr)
1817 pcie_aspm_init_link_state(bus->self);
1821 EXPORT_SYMBOL(pci_scan_slot);
1823 static int pcie_find_smpss(struct pci_dev *dev, void *data)
1827 if (!pci_is_pcie(dev))
1831 * We don't have a way to change MPS settings on devices that have
1832 * drivers attached. A hot-added device might support only the minimum
1833 * MPS setting (MPS=128). Therefore, if the fabric contains a bridge
1834 * where devices may be hot-added, we limit the fabric MPS to 128 so
1835 * hot-added devices will work correctly.
1837 * However, if we hot-add a device to a slot directly below a Root
1838 * Port, it's impossible for there to be other existing devices below
1839 * the port. We don't limit the MPS in this case because we can
1840 * reconfigure MPS on both the Root Port and the hot-added device,
1841 * and there are no other devices involved.
1843 * Note that this PCIE_BUS_SAFE path assumes no peer-to-peer DMA.
1845 if (dev->is_hotplug_bridge &&
1846 pci_pcie_type(dev) != PCI_EXP_TYPE_ROOT_PORT)
1849 if (*smpss > dev->pcie_mpss)
1850 *smpss = dev->pcie_mpss;
1855 static void pcie_write_mps(struct pci_dev *dev, int mps)
1859 if (pcie_bus_config == PCIE_BUS_PERFORMANCE) {
1860 mps = 128 << dev->pcie_mpss;
1862 if (pci_pcie_type(dev) != PCI_EXP_TYPE_ROOT_PORT &&
1864 /* For "Performance", the assumption is made that
1865 * downstream communication will never be larger than
1866 * the MRRS. So, the MPS only needs to be configured
1867 * for the upstream communication. This being the case,
1868 * walk from the top down and set the MPS of the child
1869 * to that of the parent bus.
1871 * Configure the device MPS with the smaller of the
1872 * device MPSS or the bridge MPS (which is assumed to be
1873 * properly configured at this point to the largest
1874 * allowable MPS based on its parent bus).
1876 mps = min(mps, pcie_get_mps(dev->bus->self));
1879 rc = pcie_set_mps(dev, mps);
1881 dev_err(&dev->dev, "Failed attempting to set the MPS\n");
1884 static void pcie_write_mrrs(struct pci_dev *dev)
1888 /* In the "safe" case, do not configure the MRRS. There appear to be
1889 * issues with setting MRRS to 0 on a number of devices.
1891 if (pcie_bus_config != PCIE_BUS_PERFORMANCE)
1894 /* For Max performance, the MRRS must be set to the largest supported
1895 * value. However, it cannot be configured larger than the MPS the
1896 * device or the bus can support. This should already be properly
1897 * configured by a prior call to pcie_write_mps.
1899 mrrs = pcie_get_mps(dev);
1901 /* MRRS is a R/W register. Invalid values can be written, but a
1902 * subsequent read will verify if the value is acceptable or not.
1903 * If the MRRS value provided is not acceptable (e.g., too large),
1904 * shrink the value until it is acceptable to the HW.
1906 while (mrrs != pcie_get_readrq(dev) && mrrs >= 128) {
1907 rc = pcie_set_readrq(dev, mrrs);
1911 dev_warn(&dev->dev, "Failed attempting to set the MRRS\n");
1916 dev_err(&dev->dev, "MRRS was unable to be configured with a safe value. If problems are experienced, try running with pci=pcie_bus_safe\n");
1919 static int pcie_bus_configure_set(struct pci_dev *dev, void *data)
1923 if (!pci_is_pcie(dev))
1926 if (pcie_bus_config == PCIE_BUS_TUNE_OFF ||
1927 pcie_bus_config == PCIE_BUS_DEFAULT)
1930 mps = 128 << *(u8 *)data;
1931 orig_mps = pcie_get_mps(dev);
1933 pcie_write_mps(dev, mps);
1934 pcie_write_mrrs(dev);
1936 dev_info(&dev->dev, "Max Payload Size set to %4d/%4d (was %4d), Max Read Rq %4d\n",
1937 pcie_get_mps(dev), 128 << dev->pcie_mpss,
1938 orig_mps, pcie_get_readrq(dev));
1943 /* pcie_bus_configure_settings requires that pci_walk_bus work in a top-down,
1944 * parents then children fashion. If this changes, then this code will not
1947 void pcie_bus_configure_settings(struct pci_bus *bus)
1954 if (!pci_is_pcie(bus->self))
1957 /* FIXME - Peer to peer DMA is possible, though the endpoint would need
1958 * to be aware of the MPS of the destination. To work around this,
1959 * simply force the MPS of the entire system to the smallest possible.
1961 if (pcie_bus_config == PCIE_BUS_PEER2PEER)
1964 if (pcie_bus_config == PCIE_BUS_SAFE) {
1965 smpss = bus->self->pcie_mpss;
1967 pcie_find_smpss(bus->self, &smpss);
1968 pci_walk_bus(bus, pcie_find_smpss, &smpss);
1971 pcie_bus_configure_set(bus->self, &smpss);
1972 pci_walk_bus(bus, pcie_bus_configure_set, &smpss);
1974 EXPORT_SYMBOL_GPL(pcie_bus_configure_settings);
1976 unsigned int pci_scan_child_bus(struct pci_bus *bus)
1978 unsigned int devfn, pass, max = bus->busn_res.start;
1979 struct pci_dev *dev;
1981 dev_dbg(&bus->dev, "scanning bus\n");
1983 /* Go find them, Rover! */
1984 for (devfn = 0; devfn < 0x100; devfn += 8)
1985 pci_scan_slot(bus, devfn);
1987 /* Reserve buses for SR-IOV capability. */
1988 max += pci_iov_bus_range(bus);
1991 * After performing arch-dependent fixup of the bus, look behind
1992 * all PCI-to-PCI bridges on this bus.
1994 if (!bus->is_added) {
1995 dev_dbg(&bus->dev, "fixups for bus\n");
1996 pcibios_fixup_bus(bus);
2000 for (pass = 0; pass < 2; pass++)
2001 list_for_each_entry(dev, &bus->devices, bus_list) {
2002 if (pci_is_bridge(dev))
2003 max = pci_scan_bridge(bus, dev, max, pass);
2007 * We've scanned the bus and so we know all about what's on
2008 * the other side of any bridges that may be on this bus plus
2011 * Return how far we've got finding sub-buses.
2013 dev_dbg(&bus->dev, "bus scan returning with max=%02x\n", max);
2016 EXPORT_SYMBOL_GPL(pci_scan_child_bus);
2019 * pcibios_root_bridge_prepare - Platform-specific host bridge setup.
2020 * @bridge: Host bridge to set up.
2022 * Default empty implementation. Replace with an architecture-specific setup
2023 * routine, if necessary.
2025 int __weak pcibios_root_bridge_prepare(struct pci_host_bridge *bridge)
2030 void __weak pcibios_add_bus(struct pci_bus *bus)
2034 void __weak pcibios_remove_bus(struct pci_bus *bus)
2038 struct pci_bus *pci_create_root_bus(struct device *parent, int bus,
2039 struct pci_ops *ops, void *sysdata, struct list_head *resources)
2042 struct pci_host_bridge *bridge;
2043 struct pci_bus *b, *b2;
2044 struct resource_entry *window, *n;
2045 struct resource *res;
2046 resource_size_t offset;
2050 b = pci_alloc_bus(NULL);
2054 b->sysdata = sysdata;
2056 b->number = b->busn_res.start = bus;
2057 pci_bus_assign_domain_nr(b, parent);
2058 b2 = pci_find_bus(pci_domain_nr(b), bus);
2060 /* If we already got to this bus through a different bridge, ignore it */
2061 dev_dbg(&b2->dev, "bus already known\n");
2065 bridge = pci_alloc_host_bridge(b);
2069 bridge->dev.parent = parent;
2070 bridge->dev.release = pci_release_host_bridge_dev;
2071 dev_set_name(&bridge->dev, "pci%04x:%02x", pci_domain_nr(b), bus);
2072 error = pcibios_root_bridge_prepare(bridge);
2078 error = device_register(&bridge->dev);
2080 put_device(&bridge->dev);
2083 b->bridge = get_device(&bridge->dev);
2084 device_enable_async_suspend(b->bridge);
2085 pci_set_bus_of_node(b);
2086 pci_set_bus_msi_domain(b);
2089 set_dev_node(b->bridge, pcibus_to_node(b));
2091 b->dev.class = &pcibus_class;
2092 b->dev.parent = b->bridge;
2093 dev_set_name(&b->dev, "%04x:%02x", pci_domain_nr(b), bus);
2094 error = device_register(&b->dev);
2096 goto class_dev_reg_err;
2100 /* Create legacy_io and legacy_mem files for this bus */
2101 pci_create_legacy_files(b);
2104 dev_info(parent, "PCI host bridge to bus %s\n", dev_name(&b->dev));
2106 printk(KERN_INFO "PCI host bridge to bus %s\n", dev_name(&b->dev));
2108 /* Add initial resources to the bus */
2109 resource_list_for_each_entry_safe(window, n, resources) {
2110 list_move_tail(&window->node, &bridge->windows);
2112 offset = window->offset;
2113 if (res->flags & IORESOURCE_BUS)
2114 pci_bus_insert_busn_res(b, bus, res->end);
2116 pci_bus_add_resource(b, res, 0);
2118 if (resource_type(res) == IORESOURCE_IO)
2119 fmt = " (bus address [%#06llx-%#06llx])";
2121 fmt = " (bus address [%#010llx-%#010llx])";
2122 snprintf(bus_addr, sizeof(bus_addr), fmt,
2123 (unsigned long long) (res->start - offset),
2124 (unsigned long long) (res->end - offset));
2127 dev_info(&b->dev, "root bus resource %pR%s\n", res, bus_addr);
2130 down_write(&pci_bus_sem);
2131 list_add_tail(&b->node, &pci_root_buses);
2132 up_write(&pci_bus_sem);
2137 put_device(&bridge->dev);
2138 device_unregister(&bridge->dev);
2143 EXPORT_SYMBOL_GPL(pci_create_root_bus);
2145 int pci_bus_insert_busn_res(struct pci_bus *b, int bus, int bus_max)
2147 struct resource *res = &b->busn_res;
2148 struct resource *parent_res, *conflict;
2152 res->flags = IORESOURCE_BUS;
2154 if (!pci_is_root_bus(b))
2155 parent_res = &b->parent->busn_res;
2157 parent_res = get_pci_domain_busn_res(pci_domain_nr(b));
2158 res->flags |= IORESOURCE_PCI_FIXED;
2161 conflict = request_resource_conflict(parent_res, res);
2164 dev_printk(KERN_DEBUG, &b->dev,
2165 "busn_res: can not insert %pR under %s%pR (conflicts with %s %pR)\n",
2166 res, pci_is_root_bus(b) ? "domain " : "",
2167 parent_res, conflict->name, conflict);
2169 return conflict == NULL;
2172 int pci_bus_update_busn_res_end(struct pci_bus *b, int bus_max)
2174 struct resource *res = &b->busn_res;
2175 struct resource old_res = *res;
2176 resource_size_t size;
2179 if (res->start > bus_max)
2182 size = bus_max - res->start + 1;
2183 ret = adjust_resource(res, res->start, size);
2184 dev_printk(KERN_DEBUG, &b->dev,
2185 "busn_res: %pR end %s updated to %02x\n",
2186 &old_res, ret ? "can not be" : "is", bus_max);
2188 if (!ret && !res->parent)
2189 pci_bus_insert_busn_res(b, res->start, res->end);
2194 void pci_bus_release_busn_res(struct pci_bus *b)
2196 struct resource *res = &b->busn_res;
2199 if (!res->flags || !res->parent)
2202 ret = release_resource(res);
2203 dev_printk(KERN_DEBUG, &b->dev,
2204 "busn_res: %pR %s released\n",
2205 res, ret ? "can not be" : "is");
2208 struct pci_bus *pci_scan_root_bus_msi(struct device *parent, int bus,
2209 struct pci_ops *ops, void *sysdata,
2210 struct list_head *resources, struct msi_controller *msi)
2212 struct resource_entry *window;
2217 resource_list_for_each_entry(window, resources)
2218 if (window->res->flags & IORESOURCE_BUS) {
2223 b = pci_create_root_bus(parent, bus, ops, sysdata, resources);
2231 "No busn resource found for root bus, will use [bus %02x-ff]\n",
2233 pci_bus_insert_busn_res(b, bus, 255);
2236 max = pci_scan_child_bus(b);
2239 pci_bus_update_busn_res_end(b, max);
2244 struct pci_bus *pci_scan_root_bus(struct device *parent, int bus,
2245 struct pci_ops *ops, void *sysdata, struct list_head *resources)
2247 return pci_scan_root_bus_msi(parent, bus, ops, sysdata, resources,
2250 EXPORT_SYMBOL(pci_scan_root_bus);
2252 struct pci_bus *pci_scan_bus(int bus, struct pci_ops *ops,
2255 LIST_HEAD(resources);
2258 pci_add_resource(&resources, &ioport_resource);
2259 pci_add_resource(&resources, &iomem_resource);
2260 pci_add_resource(&resources, &busn_resource);
2261 b = pci_create_root_bus(NULL, bus, ops, sysdata, &resources);
2263 pci_scan_child_bus(b);
2265 pci_free_resource_list(&resources);
2269 EXPORT_SYMBOL(pci_scan_bus);
2272 * pci_rescan_bus_bridge_resize - scan a PCI bus for devices.
2273 * @bridge: PCI bridge for the bus to scan
2275 * Scan a PCI bus and child buses for new devices, add them,
2276 * and enable them, resizing bridge mmio/io resource if necessary
2277 * and possible. The caller must ensure the child devices are already
2278 * removed for resizing to occur.
2280 * Returns the max number of subordinate bus discovered.
2282 unsigned int pci_rescan_bus_bridge_resize(struct pci_dev *bridge)
2285 struct pci_bus *bus = bridge->subordinate;
2287 max = pci_scan_child_bus(bus);
2289 pci_assign_unassigned_bridge_resources(bridge);
2291 pci_bus_add_devices(bus);
2297 * pci_rescan_bus - scan a PCI bus for devices.
2298 * @bus: PCI bus to scan
2300 * Scan a PCI bus and child buses for new devices, adds them,
2303 * Returns the max number of subordinate bus discovered.
2305 unsigned int pci_rescan_bus(struct pci_bus *bus)
2309 max = pci_scan_child_bus(bus);
2310 pci_assign_unassigned_bus_resources(bus);
2311 pci_bus_add_devices(bus);
2315 EXPORT_SYMBOL_GPL(pci_rescan_bus);
2318 * pci_rescan_bus(), pci_rescan_bus_bridge_resize() and PCI device removal
2319 * routines should always be executed under this mutex.
2321 static DEFINE_MUTEX(pci_rescan_remove_lock);
2323 void pci_lock_rescan_remove(void)
2325 mutex_lock(&pci_rescan_remove_lock);
2327 EXPORT_SYMBOL_GPL(pci_lock_rescan_remove);
2329 void pci_unlock_rescan_remove(void)
2331 mutex_unlock(&pci_rescan_remove_lock);
2333 EXPORT_SYMBOL_GPL(pci_unlock_rescan_remove);
2335 static int __init pci_sort_bf_cmp(const struct device *d_a,
2336 const struct device *d_b)
2338 const struct pci_dev *a = to_pci_dev(d_a);
2339 const struct pci_dev *b = to_pci_dev(d_b);
2341 if (pci_domain_nr(a->bus) < pci_domain_nr(b->bus)) return -1;
2342 else if (pci_domain_nr(a->bus) > pci_domain_nr(b->bus)) return 1;
2344 if (a->bus->number < b->bus->number) return -1;
2345 else if (a->bus->number > b->bus->number) return 1;
2347 if (a->devfn < b->devfn) return -1;
2348 else if (a->devfn > b->devfn) return 1;
2353 void __init pci_sort_breadthfirst(void)
2355 bus_sort_breadthfirst(&pci_bus_type, &pci_sort_bf_cmp);