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_CACHEABLE |
330 IORESOURCE_SIZEALIGN;
331 __pci_read_base(dev, pci_bar_mem32, res, rom);
335 static void pci_read_bridge_io(struct pci_bus *child)
337 struct pci_dev *dev = child->self;
338 u8 io_base_lo, io_limit_lo;
339 unsigned long io_mask, io_granularity, base, limit;
340 struct pci_bus_region region;
341 struct resource *res;
343 io_mask = PCI_IO_RANGE_MASK;
344 io_granularity = 0x1000;
345 if (dev->io_window_1k) {
346 /* Support 1K I/O space granularity */
347 io_mask = PCI_IO_1K_RANGE_MASK;
348 io_granularity = 0x400;
351 res = child->resource[0];
352 pci_read_config_byte(dev, PCI_IO_BASE, &io_base_lo);
353 pci_read_config_byte(dev, PCI_IO_LIMIT, &io_limit_lo);
354 base = (io_base_lo & io_mask) << 8;
355 limit = (io_limit_lo & io_mask) << 8;
357 if ((io_base_lo & PCI_IO_RANGE_TYPE_MASK) == PCI_IO_RANGE_TYPE_32) {
358 u16 io_base_hi, io_limit_hi;
360 pci_read_config_word(dev, PCI_IO_BASE_UPPER16, &io_base_hi);
361 pci_read_config_word(dev, PCI_IO_LIMIT_UPPER16, &io_limit_hi);
362 base |= ((unsigned long) io_base_hi << 16);
363 limit |= ((unsigned long) io_limit_hi << 16);
367 res->flags = (io_base_lo & PCI_IO_RANGE_TYPE_MASK) | IORESOURCE_IO;
369 region.end = limit + io_granularity - 1;
370 pcibios_bus_to_resource(dev->bus, res, ®ion);
371 dev_printk(KERN_DEBUG, &dev->dev, " bridge window %pR\n", res);
375 static void pci_read_bridge_mmio(struct pci_bus *child)
377 struct pci_dev *dev = child->self;
378 u16 mem_base_lo, mem_limit_lo;
379 unsigned long base, limit;
380 struct pci_bus_region region;
381 struct resource *res;
383 res = child->resource[1];
384 pci_read_config_word(dev, PCI_MEMORY_BASE, &mem_base_lo);
385 pci_read_config_word(dev, PCI_MEMORY_LIMIT, &mem_limit_lo);
386 base = ((unsigned long) mem_base_lo & PCI_MEMORY_RANGE_MASK) << 16;
387 limit = ((unsigned long) mem_limit_lo & PCI_MEMORY_RANGE_MASK) << 16;
389 res->flags = (mem_base_lo & PCI_MEMORY_RANGE_TYPE_MASK) | IORESOURCE_MEM;
391 region.end = limit + 0xfffff;
392 pcibios_bus_to_resource(dev->bus, res, ®ion);
393 dev_printk(KERN_DEBUG, &dev->dev, " bridge window %pR\n", res);
397 static void pci_read_bridge_mmio_pref(struct pci_bus *child)
399 struct pci_dev *dev = child->self;
400 u16 mem_base_lo, mem_limit_lo;
402 pci_bus_addr_t base, limit;
403 struct pci_bus_region region;
404 struct resource *res;
406 res = child->resource[2];
407 pci_read_config_word(dev, PCI_PREF_MEMORY_BASE, &mem_base_lo);
408 pci_read_config_word(dev, PCI_PREF_MEMORY_LIMIT, &mem_limit_lo);
409 base64 = (mem_base_lo & PCI_PREF_RANGE_MASK) << 16;
410 limit64 = (mem_limit_lo & PCI_PREF_RANGE_MASK) << 16;
412 if ((mem_base_lo & PCI_PREF_RANGE_TYPE_MASK) == PCI_PREF_RANGE_TYPE_64) {
413 u32 mem_base_hi, mem_limit_hi;
415 pci_read_config_dword(dev, PCI_PREF_BASE_UPPER32, &mem_base_hi);
416 pci_read_config_dword(dev, PCI_PREF_LIMIT_UPPER32, &mem_limit_hi);
419 * Some bridges set the base > limit by default, and some
420 * (broken) BIOSes do not initialize them. If we find
421 * this, just assume they are not being used.
423 if (mem_base_hi <= mem_limit_hi) {
424 base64 |= (u64) mem_base_hi << 32;
425 limit64 |= (u64) mem_limit_hi << 32;
429 base = (pci_bus_addr_t) base64;
430 limit = (pci_bus_addr_t) limit64;
432 if (base != base64) {
433 dev_err(&dev->dev, "can't handle bridge window above 4GB (bus address %#010llx)\n",
434 (unsigned long long) base64);
439 res->flags = (mem_base_lo & PCI_PREF_RANGE_TYPE_MASK) |
440 IORESOURCE_MEM | IORESOURCE_PREFETCH;
441 if (res->flags & PCI_PREF_RANGE_TYPE_64)
442 res->flags |= IORESOURCE_MEM_64;
444 region.end = limit + 0xfffff;
445 pcibios_bus_to_resource(dev->bus, res, ®ion);
446 dev_printk(KERN_DEBUG, &dev->dev, " bridge window %pR\n", res);
450 void pci_read_bridge_bases(struct pci_bus *child)
452 struct pci_dev *dev = child->self;
453 struct resource *res;
456 if (pci_is_root_bus(child)) /* It's a host bus, nothing to read */
459 dev_info(&dev->dev, "PCI bridge to %pR%s\n",
461 dev->transparent ? " (subtractive decode)" : "");
463 pci_bus_remove_resources(child);
464 for (i = 0; i < PCI_BRIDGE_RESOURCE_NUM; i++)
465 child->resource[i] = &dev->resource[PCI_BRIDGE_RESOURCES+i];
467 pci_read_bridge_io(child);
468 pci_read_bridge_mmio(child);
469 pci_read_bridge_mmio_pref(child);
471 if (dev->transparent) {
472 pci_bus_for_each_resource(child->parent, res, i) {
473 if (res && res->flags) {
474 pci_bus_add_resource(child, res,
475 PCI_SUBTRACTIVE_DECODE);
476 dev_printk(KERN_DEBUG, &dev->dev,
477 " bridge window %pR (subtractive decode)\n",
484 static struct pci_bus *pci_alloc_bus(struct pci_bus *parent)
488 b = kzalloc(sizeof(*b), GFP_KERNEL);
492 INIT_LIST_HEAD(&b->node);
493 INIT_LIST_HEAD(&b->children);
494 INIT_LIST_HEAD(&b->devices);
495 INIT_LIST_HEAD(&b->slots);
496 INIT_LIST_HEAD(&b->resources);
497 b->max_bus_speed = PCI_SPEED_UNKNOWN;
498 b->cur_bus_speed = PCI_SPEED_UNKNOWN;
499 #ifdef CONFIG_PCI_DOMAINS_GENERIC
501 b->domain_nr = parent->domain_nr;
506 static void pci_release_host_bridge_dev(struct device *dev)
508 struct pci_host_bridge *bridge = to_pci_host_bridge(dev);
510 if (bridge->release_fn)
511 bridge->release_fn(bridge);
513 pci_free_resource_list(&bridge->windows);
518 static struct pci_host_bridge *pci_alloc_host_bridge(struct pci_bus *b)
520 struct pci_host_bridge *bridge;
522 bridge = kzalloc(sizeof(*bridge), GFP_KERNEL);
526 INIT_LIST_HEAD(&bridge->windows);
531 static const unsigned char pcix_bus_speed[] = {
532 PCI_SPEED_UNKNOWN, /* 0 */
533 PCI_SPEED_66MHz_PCIX, /* 1 */
534 PCI_SPEED_100MHz_PCIX, /* 2 */
535 PCI_SPEED_133MHz_PCIX, /* 3 */
536 PCI_SPEED_UNKNOWN, /* 4 */
537 PCI_SPEED_66MHz_PCIX_ECC, /* 5 */
538 PCI_SPEED_100MHz_PCIX_ECC, /* 6 */
539 PCI_SPEED_133MHz_PCIX_ECC, /* 7 */
540 PCI_SPEED_UNKNOWN, /* 8 */
541 PCI_SPEED_66MHz_PCIX_266, /* 9 */
542 PCI_SPEED_100MHz_PCIX_266, /* A */
543 PCI_SPEED_133MHz_PCIX_266, /* B */
544 PCI_SPEED_UNKNOWN, /* C */
545 PCI_SPEED_66MHz_PCIX_533, /* D */
546 PCI_SPEED_100MHz_PCIX_533, /* E */
547 PCI_SPEED_133MHz_PCIX_533 /* F */
550 const unsigned char pcie_link_speed[] = {
551 PCI_SPEED_UNKNOWN, /* 0 */
552 PCIE_SPEED_2_5GT, /* 1 */
553 PCIE_SPEED_5_0GT, /* 2 */
554 PCIE_SPEED_8_0GT, /* 3 */
555 PCI_SPEED_UNKNOWN, /* 4 */
556 PCI_SPEED_UNKNOWN, /* 5 */
557 PCI_SPEED_UNKNOWN, /* 6 */
558 PCI_SPEED_UNKNOWN, /* 7 */
559 PCI_SPEED_UNKNOWN, /* 8 */
560 PCI_SPEED_UNKNOWN, /* 9 */
561 PCI_SPEED_UNKNOWN, /* A */
562 PCI_SPEED_UNKNOWN, /* B */
563 PCI_SPEED_UNKNOWN, /* C */
564 PCI_SPEED_UNKNOWN, /* D */
565 PCI_SPEED_UNKNOWN, /* E */
566 PCI_SPEED_UNKNOWN /* F */
569 void pcie_update_link_speed(struct pci_bus *bus, u16 linksta)
571 bus->cur_bus_speed = pcie_link_speed[linksta & PCI_EXP_LNKSTA_CLS];
573 EXPORT_SYMBOL_GPL(pcie_update_link_speed);
575 static unsigned char agp_speeds[] = {
583 static enum pci_bus_speed agp_speed(int agp3, int agpstat)
589 else if (agpstat & 2)
591 else if (agpstat & 1)
603 return agp_speeds[index];
606 static void pci_set_bus_speed(struct pci_bus *bus)
608 struct pci_dev *bridge = bus->self;
611 pos = pci_find_capability(bridge, PCI_CAP_ID_AGP);
613 pos = pci_find_capability(bridge, PCI_CAP_ID_AGP3);
617 pci_read_config_dword(bridge, pos + PCI_AGP_STATUS, &agpstat);
618 bus->max_bus_speed = agp_speed(agpstat & 8, agpstat & 7);
620 pci_read_config_dword(bridge, pos + PCI_AGP_COMMAND, &agpcmd);
621 bus->cur_bus_speed = agp_speed(agpstat & 8, agpcmd & 7);
624 pos = pci_find_capability(bridge, PCI_CAP_ID_PCIX);
627 enum pci_bus_speed max;
629 pci_read_config_word(bridge, pos + PCI_X_BRIDGE_SSTATUS,
632 if (status & PCI_X_SSTATUS_533MHZ) {
633 max = PCI_SPEED_133MHz_PCIX_533;
634 } else if (status & PCI_X_SSTATUS_266MHZ) {
635 max = PCI_SPEED_133MHz_PCIX_266;
636 } else if (status & PCI_X_SSTATUS_133MHZ) {
637 if ((status & PCI_X_SSTATUS_VERS) == PCI_X_SSTATUS_V2)
638 max = PCI_SPEED_133MHz_PCIX_ECC;
640 max = PCI_SPEED_133MHz_PCIX;
642 max = PCI_SPEED_66MHz_PCIX;
645 bus->max_bus_speed = max;
646 bus->cur_bus_speed = pcix_bus_speed[
647 (status & PCI_X_SSTATUS_FREQ) >> 6];
652 if (pci_is_pcie(bridge)) {
656 pcie_capability_read_dword(bridge, PCI_EXP_LNKCAP, &linkcap);
657 bus->max_bus_speed = pcie_link_speed[linkcap & PCI_EXP_LNKCAP_SLS];
659 pcie_capability_read_word(bridge, PCI_EXP_LNKSTA, &linksta);
660 pcie_update_link_speed(bus, linksta);
664 static struct irq_domain *pci_host_bridge_msi_domain(struct pci_bus *bus)
666 struct irq_domain *d;
669 * Any firmware interface that can resolve the msi_domain
670 * should be called from here.
672 d = pci_host_bridge_of_msi_domain(bus);
677 static void pci_set_bus_msi_domain(struct pci_bus *bus)
679 struct irq_domain *d;
682 * Either bus is the root, and we must obtain it from the
683 * firmware, or we inherit it from the bridge device.
685 if (pci_is_root_bus(bus))
686 d = pci_host_bridge_msi_domain(bus);
688 d = dev_get_msi_domain(&bus->self->dev);
690 dev_set_msi_domain(&bus->dev, d);
693 static struct pci_bus *pci_alloc_child_bus(struct pci_bus *parent,
694 struct pci_dev *bridge, int busnr)
696 struct pci_bus *child;
701 * Allocate a new bus, and inherit stuff from the parent..
703 child = pci_alloc_bus(parent);
707 child->parent = parent;
708 child->ops = parent->ops;
709 child->msi = parent->msi;
710 child->sysdata = parent->sysdata;
711 child->bus_flags = parent->bus_flags;
713 /* initialize some portions of the bus device, but don't register it
714 * now as the parent is not properly set up yet.
716 child->dev.class = &pcibus_class;
717 dev_set_name(&child->dev, "%04x:%02x", pci_domain_nr(child), busnr);
720 * Set up the primary, secondary and subordinate
723 child->number = child->busn_res.start = busnr;
724 child->primary = parent->busn_res.start;
725 child->busn_res.end = 0xff;
728 child->dev.parent = parent->bridge;
732 child->self = bridge;
733 child->bridge = get_device(&bridge->dev);
734 child->dev.parent = child->bridge;
735 pci_set_bus_of_node(child);
736 pci_set_bus_speed(child);
738 /* Set up default resource pointers and names.. */
739 for (i = 0; i < PCI_BRIDGE_RESOURCE_NUM; i++) {
740 child->resource[i] = &bridge->resource[PCI_BRIDGE_RESOURCES+i];
741 child->resource[i]->name = child->name;
743 bridge->subordinate = child;
746 pci_set_bus_msi_domain(child);
747 ret = device_register(&child->dev);
750 pcibios_add_bus(child);
752 /* Create legacy_io and legacy_mem files for this bus */
753 pci_create_legacy_files(child);
758 struct pci_bus *pci_add_new_bus(struct pci_bus *parent, struct pci_dev *dev,
761 struct pci_bus *child;
763 child = pci_alloc_child_bus(parent, dev, busnr);
765 down_write(&pci_bus_sem);
766 list_add_tail(&child->node, &parent->children);
767 up_write(&pci_bus_sem);
771 EXPORT_SYMBOL(pci_add_new_bus);
773 static void pci_enable_crs(struct pci_dev *pdev)
777 /* Enable CRS Software Visibility if supported */
778 pcie_capability_read_word(pdev, PCI_EXP_RTCAP, &root_cap);
779 if (root_cap & PCI_EXP_RTCAP_CRSVIS)
780 pcie_capability_set_word(pdev, PCI_EXP_RTCTL,
781 PCI_EXP_RTCTL_CRSSVE);
785 * If it's a bridge, configure it and scan the bus behind it.
786 * For CardBus bridges, we don't scan behind as the devices will
787 * be handled by the bridge driver itself.
789 * We need to process bridges in two passes -- first we scan those
790 * already configured by the BIOS and after we are done with all of
791 * them, we proceed to assigning numbers to the remaining buses in
792 * order to avoid overlaps between old and new bus numbers.
794 int pci_scan_bridge(struct pci_bus *bus, struct pci_dev *dev, int max, int pass)
796 struct pci_bus *child;
797 int is_cardbus = (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS);
800 u8 primary, secondary, subordinate;
803 pci_read_config_dword(dev, PCI_PRIMARY_BUS, &buses);
804 primary = buses & 0xFF;
805 secondary = (buses >> 8) & 0xFF;
806 subordinate = (buses >> 16) & 0xFF;
808 dev_dbg(&dev->dev, "scanning [bus %02x-%02x] behind bridge, pass %d\n",
809 secondary, subordinate, pass);
811 if (!primary && (primary != bus->number) && secondary && subordinate) {
812 dev_warn(&dev->dev, "Primary bus is hard wired to 0\n");
813 primary = bus->number;
816 /* Check if setup is sensible at all */
818 (primary != bus->number || secondary <= bus->number ||
819 secondary > subordinate)) {
820 dev_info(&dev->dev, "bridge configuration invalid ([bus %02x-%02x]), reconfiguring\n",
821 secondary, subordinate);
825 /* Disable MasterAbortMode during probing to avoid reporting
826 of bus errors (in some architectures) */
827 pci_read_config_word(dev, PCI_BRIDGE_CONTROL, &bctl);
828 pci_write_config_word(dev, PCI_BRIDGE_CONTROL,
829 bctl & ~PCI_BRIDGE_CTL_MASTER_ABORT);
833 if ((secondary || subordinate) && !pcibios_assign_all_busses() &&
834 !is_cardbus && !broken) {
837 * Bus already configured by firmware, process it in the first
838 * pass and just note the configuration.
844 * The bus might already exist for two reasons: Either we are
845 * rescanning the bus or the bus is reachable through more than
846 * one bridge. The second case can happen with the i450NX
849 child = pci_find_bus(pci_domain_nr(bus), secondary);
851 child = pci_add_new_bus(bus, dev, secondary);
854 child->primary = primary;
855 pci_bus_insert_busn_res(child, secondary, subordinate);
856 child->bridge_ctl = bctl;
859 /* Read and initialize bridge resources */
860 pci_read_bridge_bases(child);
862 cmax = pci_scan_child_bus(child);
863 if (cmax > subordinate)
864 dev_warn(&dev->dev, "bridge has subordinate %02x but max busn %02x\n",
866 /* subordinate should equal child->busn_res.end */
867 if (subordinate > max)
871 * We need to assign a number to this bus which we always
872 * do in the second pass.
875 if (pcibios_assign_all_busses() || broken || is_cardbus)
876 /* Temporarily disable forwarding of the
877 configuration cycles on all bridges in
878 this bus segment to avoid possible
879 conflicts in the second pass between two
880 bridges programmed with overlapping
882 pci_write_config_dword(dev, PCI_PRIMARY_BUS,
888 pci_write_config_word(dev, PCI_STATUS, 0xffff);
890 /* Prevent assigning a bus number that already exists.
891 * This can happen when a bridge is hot-plugged, so in
892 * this case we only re-scan this bus. */
893 child = pci_find_bus(pci_domain_nr(bus), max+1);
895 child = pci_add_new_bus(bus, dev, max+1);
898 pci_bus_insert_busn_res(child, max+1, 0xff);
901 buses = (buses & 0xff000000)
902 | ((unsigned int)(child->primary) << 0)
903 | ((unsigned int)(child->busn_res.start) << 8)
904 | ((unsigned int)(child->busn_res.end) << 16);
907 * yenta.c forces a secondary latency timer of 176.
908 * Copy that behaviour here.
911 buses &= ~0xff000000;
912 buses |= CARDBUS_LATENCY_TIMER << 24;
916 * We need to blast all three values with a single write.
918 pci_write_config_dword(dev, PCI_PRIMARY_BUS, buses);
921 child->bridge_ctl = bctl;
923 /* Read and initialize bridge resources */
924 pci_read_bridge_bases(child);
925 max = pci_scan_child_bus(child);
928 * For CardBus bridges, we leave 4 bus numbers
929 * as cards with a PCI-to-PCI bridge can be
932 for (i = 0; i < CARDBUS_RESERVE_BUSNR; i++) {
933 struct pci_bus *parent = bus;
934 if (pci_find_bus(pci_domain_nr(bus),
937 while (parent->parent) {
938 if ((!pcibios_assign_all_busses()) &&
939 (parent->busn_res.end > max) &&
940 (parent->busn_res.end <= max+i)) {
943 parent = parent->parent;
947 * Often, there are two cardbus bridges
948 * -- try to leave one valid bus number
958 * Set the subordinate bus number to its real value.
960 pci_bus_update_busn_res_end(child, max);
961 pci_write_config_byte(dev, PCI_SUBORDINATE_BUS, max);
965 (is_cardbus ? "PCI CardBus %04x:%02x" : "PCI Bus %04x:%02x"),
966 pci_domain_nr(bus), child->number);
968 /* Has only triggered on CardBus, fixup is in yenta_socket */
969 while (bus->parent) {
970 if ((child->busn_res.end > bus->busn_res.end) ||
971 (child->number > bus->busn_res.end) ||
972 (child->number < bus->number) ||
973 (child->busn_res.end < bus->number)) {
974 dev_info(&child->dev, "%pR %s hidden behind%s bridge %s %pR\n",
976 (bus->number > child->busn_res.end &&
977 bus->busn_res.end < child->number) ?
978 "wholly" : "partially",
979 bus->self->transparent ? " transparent" : "",
987 pci_write_config_word(dev, PCI_BRIDGE_CONTROL, bctl);
991 EXPORT_SYMBOL(pci_scan_bridge);
994 * Read interrupt line and base address registers.
995 * The architecture-dependent code can tweak these, of course.
997 static void pci_read_irq(struct pci_dev *dev)
1001 pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &irq);
1004 pci_read_config_byte(dev, PCI_INTERRUPT_LINE, &irq);
1008 void set_pcie_port_type(struct pci_dev *pdev)
1013 struct pci_dev *parent;
1015 pos = pci_find_capability(pdev, PCI_CAP_ID_EXP);
1018 pdev->pcie_cap = pos;
1019 pci_read_config_word(pdev, pos + PCI_EXP_FLAGS, ®16);
1020 pdev->pcie_flags_reg = reg16;
1021 pci_read_config_word(pdev, pos + PCI_EXP_DEVCAP, ®16);
1022 pdev->pcie_mpss = reg16 & PCI_EXP_DEVCAP_PAYLOAD;
1025 * A Root Port is always the upstream end of a Link. No PCIe
1026 * component has two Links. Two Links are connected by a Switch
1027 * that has a Port on each Link and internal logic to connect the
1030 type = pci_pcie_type(pdev);
1031 if (type == PCI_EXP_TYPE_ROOT_PORT)
1032 pdev->has_secondary_link = 1;
1033 else if (type == PCI_EXP_TYPE_UPSTREAM ||
1034 type == PCI_EXP_TYPE_DOWNSTREAM) {
1035 parent = pci_upstream_bridge(pdev);
1038 * Usually there's an upstream device (Root Port or Switch
1039 * Downstream Port), but we can't assume one exists.
1041 if (parent && !parent->has_secondary_link)
1042 pdev->has_secondary_link = 1;
1046 void set_pcie_hotplug_bridge(struct pci_dev *pdev)
1050 pcie_capability_read_dword(pdev, PCI_EXP_SLTCAP, ®32);
1051 if (reg32 & PCI_EXP_SLTCAP_HPC)
1052 pdev->is_hotplug_bridge = 1;
1056 * pci_ext_cfg_is_aliased - is ext config space just an alias of std config?
1059 * PCI Express to PCI/PCI-X Bridge Specification, rev 1.0, 4.1.4 says that
1060 * when forwarding a type1 configuration request the bridge must check that
1061 * the extended register address field is zero. The bridge is not permitted
1062 * to forward the transactions and must handle it as an Unsupported Request.
1063 * Some bridges do not follow this rule and simply drop the extended register
1064 * bits, resulting in the standard config space being aliased, every 256
1065 * bytes across the entire configuration space. Test for this condition by
1066 * comparing the first dword of each potential alias to the vendor/device ID.
1068 * ASM1083/1085 PCIe-to-PCI Reversible Bridge (1b21:1080, rev 01 & 03)
1069 * AMD/ATI SBx00 PCI to PCI Bridge (1002:4384, rev 40)
1071 static bool pci_ext_cfg_is_aliased(struct pci_dev *dev)
1073 #ifdef CONFIG_PCI_QUIRKS
1077 pci_read_config_dword(dev, PCI_VENDOR_ID, &header);
1079 for (pos = PCI_CFG_SPACE_SIZE;
1080 pos < PCI_CFG_SPACE_EXP_SIZE; pos += PCI_CFG_SPACE_SIZE) {
1081 if (pci_read_config_dword(dev, pos, &tmp) != PCIBIOS_SUCCESSFUL
1093 * pci_cfg_space_size - get the configuration space size of the PCI device.
1096 * Regular PCI devices have 256 bytes, but PCI-X 2 and PCI Express devices
1097 * have 4096 bytes. Even if the device is capable, that doesn't mean we can
1098 * access it. Maybe we don't have a way to generate extended config space
1099 * accesses, or the device is behind a reverse Express bridge. So we try
1100 * reading the dword at 0x100 which must either be 0 or a valid extended
1101 * capability header.
1103 static int pci_cfg_space_size_ext(struct pci_dev *dev)
1106 int pos = PCI_CFG_SPACE_SIZE;
1108 if (pci_read_config_dword(dev, pos, &status) != PCIBIOS_SUCCESSFUL)
1110 if (status == 0xffffffff || pci_ext_cfg_is_aliased(dev))
1113 return PCI_CFG_SPACE_EXP_SIZE;
1116 return PCI_CFG_SPACE_SIZE;
1119 int pci_cfg_space_size(struct pci_dev *dev)
1125 class = dev->class >> 8;
1126 if (class == PCI_CLASS_BRIDGE_HOST)
1127 return pci_cfg_space_size_ext(dev);
1129 if (!pci_is_pcie(dev)) {
1130 pos = pci_find_capability(dev, PCI_CAP_ID_PCIX);
1134 pci_read_config_dword(dev, pos + PCI_X_STATUS, &status);
1135 if (!(status & (PCI_X_STATUS_266MHZ | PCI_X_STATUS_533MHZ)))
1139 return pci_cfg_space_size_ext(dev);
1142 return PCI_CFG_SPACE_SIZE;
1145 #define LEGACY_IO_RESOURCE (IORESOURCE_IO | IORESOURCE_PCI_FIXED)
1147 void pci_msi_setup_pci_dev(struct pci_dev *dev)
1150 * Disable the MSI hardware to avoid screaming interrupts
1151 * during boot. This is the power on reset default so
1152 * usually this should be a noop.
1154 dev->msi_cap = pci_find_capability(dev, PCI_CAP_ID_MSI);
1156 pci_msi_set_enable(dev, 0);
1158 dev->msix_cap = pci_find_capability(dev, PCI_CAP_ID_MSIX);
1160 pci_msix_clear_and_set_ctrl(dev, PCI_MSIX_FLAGS_ENABLE, 0);
1164 * pci_setup_device - fill in class and map information of a device
1165 * @dev: the device structure to fill
1167 * Initialize the device structure with information about the device's
1168 * vendor,class,memory and IO-space addresses,IRQ lines etc.
1169 * Called at initialisation of the PCI subsystem and by CardBus services.
1170 * Returns 0 on success and negative if unknown type of device (not normal,
1171 * bridge or CardBus).
1173 int pci_setup_device(struct pci_dev *dev)
1178 struct pci_bus_region region;
1179 struct resource *res;
1181 if (pci_read_config_byte(dev, PCI_HEADER_TYPE, &hdr_type))
1184 dev->sysdata = dev->bus->sysdata;
1185 dev->dev.parent = dev->bus->bridge;
1186 dev->dev.bus = &pci_bus_type;
1187 dev->hdr_type = hdr_type & 0x7f;
1188 dev->multifunction = !!(hdr_type & 0x80);
1189 dev->error_state = pci_channel_io_normal;
1190 set_pcie_port_type(dev);
1192 pci_dev_assign_slot(dev);
1193 /* Assume 32-bit PCI; let 64-bit PCI cards (which are far rarer)
1194 set this higher, assuming the system even supports it. */
1195 dev->dma_mask = 0xffffffff;
1197 dev_set_name(&dev->dev, "%04x:%02x:%02x.%d", pci_domain_nr(dev->bus),
1198 dev->bus->number, PCI_SLOT(dev->devfn),
1199 PCI_FUNC(dev->devfn));
1201 pci_read_config_dword(dev, PCI_CLASS_REVISION, &class);
1202 dev->revision = class & 0xff;
1203 dev->class = class >> 8; /* upper 3 bytes */
1205 dev_printk(KERN_DEBUG, &dev->dev, "[%04x:%04x] type %02x class %#08x\n",
1206 dev->vendor, dev->device, dev->hdr_type, dev->class);
1208 /* need to have dev->class ready */
1209 dev->cfg_size = pci_cfg_space_size(dev);
1211 /* "Unknown power state" */
1212 dev->current_state = PCI_UNKNOWN;
1214 pci_msi_setup_pci_dev(dev);
1216 /* Early fixups, before probing the BARs */
1217 pci_fixup_device(pci_fixup_early, dev);
1218 /* device class may be changed after fixup */
1219 class = dev->class >> 8;
1221 switch (dev->hdr_type) { /* header type */
1222 case PCI_HEADER_TYPE_NORMAL: /* standard header */
1223 if (class == PCI_CLASS_BRIDGE_PCI)
1226 pci_read_bases(dev, 6, PCI_ROM_ADDRESS);
1227 pci_read_config_word(dev, PCI_SUBSYSTEM_VENDOR_ID, &dev->subsystem_vendor);
1228 pci_read_config_word(dev, PCI_SUBSYSTEM_ID, &dev->subsystem_device);
1231 * Do the ugly legacy mode stuff here rather than broken chip
1232 * quirk code. Legacy mode ATA controllers have fixed
1233 * addresses. These are not always echoed in BAR0-3, and
1234 * BAR0-3 in a few cases contain junk!
1236 if (class == PCI_CLASS_STORAGE_IDE) {
1238 pci_read_config_byte(dev, PCI_CLASS_PROG, &progif);
1239 if ((progif & 1) == 0) {
1240 region.start = 0x1F0;
1242 res = &dev->resource[0];
1243 res->flags = LEGACY_IO_RESOURCE;
1244 pcibios_bus_to_resource(dev->bus, res, ®ion);
1245 dev_info(&dev->dev, "legacy IDE quirk: reg 0x10: %pR\n",
1247 region.start = 0x3F6;
1249 res = &dev->resource[1];
1250 res->flags = LEGACY_IO_RESOURCE;
1251 pcibios_bus_to_resource(dev->bus, res, ®ion);
1252 dev_info(&dev->dev, "legacy IDE quirk: reg 0x14: %pR\n",
1255 if ((progif & 4) == 0) {
1256 region.start = 0x170;
1258 res = &dev->resource[2];
1259 res->flags = LEGACY_IO_RESOURCE;
1260 pcibios_bus_to_resource(dev->bus, res, ®ion);
1261 dev_info(&dev->dev, "legacy IDE quirk: reg 0x18: %pR\n",
1263 region.start = 0x376;
1265 res = &dev->resource[3];
1266 res->flags = LEGACY_IO_RESOURCE;
1267 pcibios_bus_to_resource(dev->bus, res, ®ion);
1268 dev_info(&dev->dev, "legacy IDE quirk: reg 0x1c: %pR\n",
1274 case PCI_HEADER_TYPE_BRIDGE: /* bridge header */
1275 if (class != PCI_CLASS_BRIDGE_PCI)
1277 /* The PCI-to-PCI bridge spec requires that subtractive
1278 decoding (i.e. transparent) bridge must have programming
1279 interface code of 0x01. */
1281 dev->transparent = ((dev->class & 0xff) == 1);
1282 pci_read_bases(dev, 2, PCI_ROM_ADDRESS1);
1283 set_pcie_hotplug_bridge(dev);
1284 pos = pci_find_capability(dev, PCI_CAP_ID_SSVID);
1286 pci_read_config_word(dev, pos + PCI_SSVID_VENDOR_ID, &dev->subsystem_vendor);
1287 pci_read_config_word(dev, pos + PCI_SSVID_DEVICE_ID, &dev->subsystem_device);
1291 case PCI_HEADER_TYPE_CARDBUS: /* CardBus bridge header */
1292 if (class != PCI_CLASS_BRIDGE_CARDBUS)
1295 pci_read_bases(dev, 1, 0);
1296 pci_read_config_word(dev, PCI_CB_SUBSYSTEM_VENDOR_ID, &dev->subsystem_vendor);
1297 pci_read_config_word(dev, PCI_CB_SUBSYSTEM_ID, &dev->subsystem_device);
1300 default: /* unknown header */
1301 dev_err(&dev->dev, "unknown header type %02x, ignoring device\n",
1306 dev_err(&dev->dev, "ignoring class %#08x (doesn't match header type %02x)\n",
1307 dev->class, dev->hdr_type);
1308 dev->class = PCI_CLASS_NOT_DEFINED << 8;
1311 /* We found a fine healthy device, go go go... */
1315 static void pci_configure_mps(struct pci_dev *dev)
1317 struct pci_dev *bridge = pci_upstream_bridge(dev);
1320 if (!pci_is_pcie(dev) || !bridge || !pci_is_pcie(bridge))
1323 mps = pcie_get_mps(dev);
1324 p_mps = pcie_get_mps(bridge);
1329 if (pcie_bus_config == PCIE_BUS_TUNE_OFF) {
1330 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",
1331 mps, pci_name(bridge), p_mps);
1336 * Fancier MPS configuration is done later by
1337 * pcie_bus_configure_settings()
1339 if (pcie_bus_config != PCIE_BUS_DEFAULT)
1342 rc = pcie_set_mps(dev, p_mps);
1344 dev_warn(&dev->dev, "can't set Max Payload Size to %d; if necessary, use \"pci=pcie_bus_safe\" and report a bug\n",
1349 dev_info(&dev->dev, "Max Payload Size set to %d (was %d, max %d)\n",
1350 p_mps, mps, 128 << dev->pcie_mpss);
1353 static struct hpp_type0 pci_default_type0 = {
1355 .cache_line_size = 8,
1356 .latency_timer = 0x40,
1361 static void program_hpp_type0(struct pci_dev *dev, struct hpp_type0 *hpp)
1363 u16 pci_cmd, pci_bctl;
1366 hpp = &pci_default_type0;
1368 if (hpp->revision > 1) {
1370 "PCI settings rev %d not supported; using defaults\n",
1372 hpp = &pci_default_type0;
1375 pci_write_config_byte(dev, PCI_CACHE_LINE_SIZE, hpp->cache_line_size);
1376 pci_write_config_byte(dev, PCI_LATENCY_TIMER, hpp->latency_timer);
1377 pci_read_config_word(dev, PCI_COMMAND, &pci_cmd);
1378 if (hpp->enable_serr)
1379 pci_cmd |= PCI_COMMAND_SERR;
1380 if (hpp->enable_perr)
1381 pci_cmd |= PCI_COMMAND_PARITY;
1382 pci_write_config_word(dev, PCI_COMMAND, pci_cmd);
1384 /* Program bridge control value */
1385 if ((dev->class >> 8) == PCI_CLASS_BRIDGE_PCI) {
1386 pci_write_config_byte(dev, PCI_SEC_LATENCY_TIMER,
1387 hpp->latency_timer);
1388 pci_read_config_word(dev, PCI_BRIDGE_CONTROL, &pci_bctl);
1389 if (hpp->enable_serr)
1390 pci_bctl |= PCI_BRIDGE_CTL_SERR;
1391 if (hpp->enable_perr)
1392 pci_bctl |= PCI_BRIDGE_CTL_PARITY;
1393 pci_write_config_word(dev, PCI_BRIDGE_CONTROL, pci_bctl);
1397 static void program_hpp_type1(struct pci_dev *dev, struct hpp_type1 *hpp)
1400 dev_warn(&dev->dev, "PCI-X settings not supported\n");
1403 static void program_hpp_type2(struct pci_dev *dev, struct hpp_type2 *hpp)
1411 if (hpp->revision > 1) {
1412 dev_warn(&dev->dev, "PCIe settings rev %d not supported\n",
1418 * Don't allow _HPX to change MPS or MRRS settings. We manage
1419 * those to make sure they're consistent with the rest of the
1422 hpp->pci_exp_devctl_and |= PCI_EXP_DEVCTL_PAYLOAD |
1423 PCI_EXP_DEVCTL_READRQ;
1424 hpp->pci_exp_devctl_or &= ~(PCI_EXP_DEVCTL_PAYLOAD |
1425 PCI_EXP_DEVCTL_READRQ);
1427 /* Initialize Device Control Register */
1428 pcie_capability_clear_and_set_word(dev, PCI_EXP_DEVCTL,
1429 ~hpp->pci_exp_devctl_and, hpp->pci_exp_devctl_or);
1431 /* Initialize Link Control Register */
1432 if (pcie_cap_has_lnkctl(dev))
1433 pcie_capability_clear_and_set_word(dev, PCI_EXP_LNKCTL,
1434 ~hpp->pci_exp_lnkctl_and, hpp->pci_exp_lnkctl_or);
1436 /* Find Advanced Error Reporting Enhanced Capability */
1437 pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ERR);
1441 /* Initialize Uncorrectable Error Mask Register */
1442 pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_MASK, ®32);
1443 reg32 = (reg32 & hpp->unc_err_mask_and) | hpp->unc_err_mask_or;
1444 pci_write_config_dword(dev, pos + PCI_ERR_UNCOR_MASK, reg32);
1446 /* Initialize Uncorrectable Error Severity Register */
1447 pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_SEVER, ®32);
1448 reg32 = (reg32 & hpp->unc_err_sever_and) | hpp->unc_err_sever_or;
1449 pci_write_config_dword(dev, pos + PCI_ERR_UNCOR_SEVER, reg32);
1451 /* Initialize Correctable Error Mask Register */
1452 pci_read_config_dword(dev, pos + PCI_ERR_COR_MASK, ®32);
1453 reg32 = (reg32 & hpp->cor_err_mask_and) | hpp->cor_err_mask_or;
1454 pci_write_config_dword(dev, pos + PCI_ERR_COR_MASK, reg32);
1456 /* Initialize Advanced Error Capabilities and Control Register */
1457 pci_read_config_dword(dev, pos + PCI_ERR_CAP, ®32);
1458 reg32 = (reg32 & hpp->adv_err_cap_and) | hpp->adv_err_cap_or;
1459 pci_write_config_dword(dev, pos + PCI_ERR_CAP, reg32);
1462 * FIXME: The following two registers are not supported yet.
1464 * o Secondary Uncorrectable Error Severity Register
1465 * o Secondary Uncorrectable Error Mask Register
1469 static void pci_configure_device(struct pci_dev *dev)
1471 struct hotplug_params hpp;
1474 pci_configure_mps(dev);
1476 memset(&hpp, 0, sizeof(hpp));
1477 ret = pci_get_hp_params(dev, &hpp);
1481 program_hpp_type2(dev, hpp.t2);
1482 program_hpp_type1(dev, hpp.t1);
1483 program_hpp_type0(dev, hpp.t0);
1486 static void pci_release_capabilities(struct pci_dev *dev)
1488 pci_vpd_release(dev);
1489 pci_iov_release(dev);
1490 pci_free_cap_save_buffers(dev);
1494 * pci_release_dev - free a pci device structure when all users of it are finished.
1495 * @dev: device that's been disconnected
1497 * Will be called only by the device core when all users of this pci device are
1500 static void pci_release_dev(struct device *dev)
1502 struct pci_dev *pci_dev;
1504 pci_dev = to_pci_dev(dev);
1505 pci_release_capabilities(pci_dev);
1506 pci_release_of_node(pci_dev);
1507 pcibios_release_device(pci_dev);
1508 pci_bus_put(pci_dev->bus);
1509 kfree(pci_dev->driver_override);
1513 struct pci_dev *pci_alloc_dev(struct pci_bus *bus)
1515 struct pci_dev *dev;
1517 dev = kzalloc(sizeof(struct pci_dev), GFP_KERNEL);
1521 INIT_LIST_HEAD(&dev->bus_list);
1522 dev->dev.type = &pci_dev_type;
1523 dev->bus = pci_bus_get(bus);
1527 EXPORT_SYMBOL(pci_alloc_dev);
1529 bool pci_bus_read_dev_vendor_id(struct pci_bus *bus, int devfn, u32 *l,
1534 if (pci_bus_read_config_dword(bus, devfn, PCI_VENDOR_ID, l))
1537 /* some broken boards return 0 or ~0 if a slot is empty: */
1538 if (*l == 0xffffffff || *l == 0x00000000 ||
1539 *l == 0x0000ffff || *l == 0xffff0000)
1543 * Configuration Request Retry Status. Some root ports return the
1544 * actual device ID instead of the synthetic ID (0xFFFF) required
1545 * by the PCIe spec. Ignore the device ID and only check for
1548 while ((*l & 0xffff) == 0x0001) {
1554 if (pci_bus_read_config_dword(bus, devfn, PCI_VENDOR_ID, l))
1556 /* Card hasn't responded in 60 seconds? Must be stuck. */
1557 if (delay > crs_timeout) {
1558 printk(KERN_WARNING "pci %04x:%02x:%02x.%d: not responding\n",
1559 pci_domain_nr(bus), bus->number, PCI_SLOT(devfn),
1567 EXPORT_SYMBOL(pci_bus_read_dev_vendor_id);
1570 * Read the config data for a PCI device, sanity-check it
1571 * and fill in the dev structure...
1573 static struct pci_dev *pci_scan_device(struct pci_bus *bus, int devfn)
1575 struct pci_dev *dev;
1578 if (!pci_bus_read_dev_vendor_id(bus, devfn, &l, 60*1000))
1581 dev = pci_alloc_dev(bus);
1586 dev->vendor = l & 0xffff;
1587 dev->device = (l >> 16) & 0xffff;
1589 pci_set_of_node(dev);
1591 if (pci_setup_device(dev)) {
1592 pci_bus_put(dev->bus);
1600 static void pci_init_capabilities(struct pci_dev *dev)
1602 /* MSI/MSI-X list */
1603 pci_msi_init_pci_dev(dev);
1605 /* Buffers for saving PCIe and PCI-X capabilities */
1606 pci_allocate_cap_save_buffers(dev);
1608 /* Power Management */
1611 /* Vital Product Data */
1612 pci_vpd_pci22_init(dev);
1614 /* Alternative Routing-ID Forwarding */
1615 pci_configure_ari(dev);
1617 /* Single Root I/O Virtualization */
1620 /* Address Translation Services */
1623 /* Enable ACS P2P upstream forwarding */
1624 pci_enable_acs(dev);
1627 static void pci_set_msi_domain(struct pci_dev *dev)
1630 * If no domain has been set through the pcibios_add_device
1631 * callback, inherit the default from the bus device.
1633 if (!dev_get_msi_domain(&dev->dev))
1634 dev_set_msi_domain(&dev->dev,
1635 dev_get_msi_domain(&dev->bus->dev));
1638 void pci_device_add(struct pci_dev *dev, struct pci_bus *bus)
1642 pci_configure_device(dev);
1644 device_initialize(&dev->dev);
1645 dev->dev.release = pci_release_dev;
1647 set_dev_node(&dev->dev, pcibus_to_node(bus));
1648 dev->dev.dma_mask = &dev->dma_mask;
1649 dev->dev.dma_parms = &dev->dma_parms;
1650 dev->dev.coherent_dma_mask = 0xffffffffull;
1651 of_pci_dma_configure(dev);
1653 pci_set_dma_max_seg_size(dev, 65536);
1654 pci_set_dma_seg_boundary(dev, 0xffffffff);
1656 /* Fix up broken headers */
1657 pci_fixup_device(pci_fixup_header, dev);
1659 /* moved out from quirk header fixup code */
1660 pci_reassigndev_resource_alignment(dev);
1662 /* Clear the state_saved flag. */
1663 dev->state_saved = false;
1665 /* Initialize various capabilities */
1666 pci_init_capabilities(dev);
1669 * Add the device to our list of discovered devices
1670 * and the bus list for fixup functions, etc.
1672 down_write(&pci_bus_sem);
1673 list_add_tail(&dev->bus_list, &bus->devices);
1674 up_write(&pci_bus_sem);
1676 ret = pcibios_add_device(dev);
1679 /* Setup MSI irq domain */
1680 pci_set_msi_domain(dev);
1682 /* Notifier could use PCI capabilities */
1683 dev->match_driver = false;
1684 ret = device_add(&dev->dev);
1688 struct pci_dev *pci_scan_single_device(struct pci_bus *bus, int devfn)
1690 struct pci_dev *dev;
1692 dev = pci_get_slot(bus, devfn);
1698 dev = pci_scan_device(bus, devfn);
1702 pci_device_add(dev, bus);
1706 EXPORT_SYMBOL(pci_scan_single_device);
1708 static unsigned next_fn(struct pci_bus *bus, struct pci_dev *dev, unsigned fn)
1714 if (pci_ari_enabled(bus)) {
1717 pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ARI);
1721 pci_read_config_word(dev, pos + PCI_ARI_CAP, &cap);
1722 next_fn = PCI_ARI_CAP_NFN(cap);
1724 return 0; /* protect against malformed list */
1729 /* dev may be NULL for non-contiguous multifunction devices */
1730 if (!dev || dev->multifunction)
1731 return (fn + 1) % 8;
1736 static int only_one_child(struct pci_bus *bus)
1738 struct pci_dev *parent = bus->self;
1740 if (!parent || !pci_is_pcie(parent))
1742 if (pci_pcie_type(parent) == PCI_EXP_TYPE_ROOT_PORT)
1744 if (parent->has_secondary_link &&
1745 !pci_has_flag(PCI_SCAN_ALL_PCIE_DEVS))
1751 * pci_scan_slot - scan a PCI slot on a bus for devices.
1752 * @bus: PCI bus to scan
1753 * @devfn: slot number to scan (must have zero function.)
1755 * Scan a PCI slot on the specified PCI bus for devices, adding
1756 * discovered devices to the @bus->devices list. New devices
1757 * will not have is_added set.
1759 * Returns the number of new devices found.
1761 int pci_scan_slot(struct pci_bus *bus, int devfn)
1763 unsigned fn, nr = 0;
1764 struct pci_dev *dev;
1766 if (only_one_child(bus) && (devfn > 0))
1767 return 0; /* Already scanned the entire slot */
1769 dev = pci_scan_single_device(bus, devfn);
1775 for (fn = next_fn(bus, dev, 0); fn > 0; fn = next_fn(bus, dev, fn)) {
1776 dev = pci_scan_single_device(bus, devfn + fn);
1780 dev->multifunction = 1;
1784 /* only one slot has pcie device */
1785 if (bus->self && nr)
1786 pcie_aspm_init_link_state(bus->self);
1790 EXPORT_SYMBOL(pci_scan_slot);
1792 static int pcie_find_smpss(struct pci_dev *dev, void *data)
1796 if (!pci_is_pcie(dev))
1800 * We don't have a way to change MPS settings on devices that have
1801 * drivers attached. A hot-added device might support only the minimum
1802 * MPS setting (MPS=128). Therefore, if the fabric contains a bridge
1803 * where devices may be hot-added, we limit the fabric MPS to 128 so
1804 * hot-added devices will work correctly.
1806 * However, if we hot-add a device to a slot directly below a Root
1807 * Port, it's impossible for there to be other existing devices below
1808 * the port. We don't limit the MPS in this case because we can
1809 * reconfigure MPS on both the Root Port and the hot-added device,
1810 * and there are no other devices involved.
1812 * Note that this PCIE_BUS_SAFE path assumes no peer-to-peer DMA.
1814 if (dev->is_hotplug_bridge &&
1815 pci_pcie_type(dev) != PCI_EXP_TYPE_ROOT_PORT)
1818 if (*smpss > dev->pcie_mpss)
1819 *smpss = dev->pcie_mpss;
1824 static void pcie_write_mps(struct pci_dev *dev, int mps)
1828 if (pcie_bus_config == PCIE_BUS_PERFORMANCE) {
1829 mps = 128 << dev->pcie_mpss;
1831 if (pci_pcie_type(dev) != PCI_EXP_TYPE_ROOT_PORT &&
1833 /* For "Performance", the assumption is made that
1834 * downstream communication will never be larger than
1835 * the MRRS. So, the MPS only needs to be configured
1836 * for the upstream communication. This being the case,
1837 * walk from the top down and set the MPS of the child
1838 * to that of the parent bus.
1840 * Configure the device MPS with the smaller of the
1841 * device MPSS or the bridge MPS (which is assumed to be
1842 * properly configured at this point to the largest
1843 * allowable MPS based on its parent bus).
1845 mps = min(mps, pcie_get_mps(dev->bus->self));
1848 rc = pcie_set_mps(dev, mps);
1850 dev_err(&dev->dev, "Failed attempting to set the MPS\n");
1853 static void pcie_write_mrrs(struct pci_dev *dev)
1857 /* In the "safe" case, do not configure the MRRS. There appear to be
1858 * issues with setting MRRS to 0 on a number of devices.
1860 if (pcie_bus_config != PCIE_BUS_PERFORMANCE)
1863 /* For Max performance, the MRRS must be set to the largest supported
1864 * value. However, it cannot be configured larger than the MPS the
1865 * device or the bus can support. This should already be properly
1866 * configured by a prior call to pcie_write_mps.
1868 mrrs = pcie_get_mps(dev);
1870 /* MRRS is a R/W register. Invalid values can be written, but a
1871 * subsequent read will verify if the value is acceptable or not.
1872 * If the MRRS value provided is not acceptable (e.g., too large),
1873 * shrink the value until it is acceptable to the HW.
1875 while (mrrs != pcie_get_readrq(dev) && mrrs >= 128) {
1876 rc = pcie_set_readrq(dev, mrrs);
1880 dev_warn(&dev->dev, "Failed attempting to set the MRRS\n");
1885 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");
1888 static int pcie_bus_configure_set(struct pci_dev *dev, void *data)
1892 if (!pci_is_pcie(dev))
1895 if (pcie_bus_config == PCIE_BUS_TUNE_OFF ||
1896 pcie_bus_config == PCIE_BUS_DEFAULT)
1899 mps = 128 << *(u8 *)data;
1900 orig_mps = pcie_get_mps(dev);
1902 pcie_write_mps(dev, mps);
1903 pcie_write_mrrs(dev);
1905 dev_info(&dev->dev, "Max Payload Size set to %4d/%4d (was %4d), Max Read Rq %4d\n",
1906 pcie_get_mps(dev), 128 << dev->pcie_mpss,
1907 orig_mps, pcie_get_readrq(dev));
1912 /* pcie_bus_configure_settings requires that pci_walk_bus work in a top-down,
1913 * parents then children fashion. If this changes, then this code will not
1916 void pcie_bus_configure_settings(struct pci_bus *bus)
1923 if (!pci_is_pcie(bus->self))
1926 /* FIXME - Peer to peer DMA is possible, though the endpoint would need
1927 * to be aware of the MPS of the destination. To work around this,
1928 * simply force the MPS of the entire system to the smallest possible.
1930 if (pcie_bus_config == PCIE_BUS_PEER2PEER)
1933 if (pcie_bus_config == PCIE_BUS_SAFE) {
1934 smpss = bus->self->pcie_mpss;
1936 pcie_find_smpss(bus->self, &smpss);
1937 pci_walk_bus(bus, pcie_find_smpss, &smpss);
1940 pcie_bus_configure_set(bus->self, &smpss);
1941 pci_walk_bus(bus, pcie_bus_configure_set, &smpss);
1943 EXPORT_SYMBOL_GPL(pcie_bus_configure_settings);
1945 unsigned int pci_scan_child_bus(struct pci_bus *bus)
1947 unsigned int devfn, pass, max = bus->busn_res.start;
1948 struct pci_dev *dev;
1950 dev_dbg(&bus->dev, "scanning bus\n");
1952 /* Go find them, Rover! */
1953 for (devfn = 0; devfn < 0x100; devfn += 8)
1954 pci_scan_slot(bus, devfn);
1956 /* Reserve buses for SR-IOV capability. */
1957 max += pci_iov_bus_range(bus);
1960 * After performing arch-dependent fixup of the bus, look behind
1961 * all PCI-to-PCI bridges on this bus.
1963 if (!bus->is_added) {
1964 dev_dbg(&bus->dev, "fixups for bus\n");
1965 pcibios_fixup_bus(bus);
1969 for (pass = 0; pass < 2; pass++)
1970 list_for_each_entry(dev, &bus->devices, bus_list) {
1971 if (pci_is_bridge(dev))
1972 max = pci_scan_bridge(bus, dev, max, pass);
1976 * We've scanned the bus and so we know all about what's on
1977 * the other side of any bridges that may be on this bus plus
1980 * Return how far we've got finding sub-buses.
1982 dev_dbg(&bus->dev, "bus scan returning with max=%02x\n", max);
1985 EXPORT_SYMBOL_GPL(pci_scan_child_bus);
1988 * pcibios_root_bridge_prepare - Platform-specific host bridge setup.
1989 * @bridge: Host bridge to set up.
1991 * Default empty implementation. Replace with an architecture-specific setup
1992 * routine, if necessary.
1994 int __weak pcibios_root_bridge_prepare(struct pci_host_bridge *bridge)
1999 void __weak pcibios_add_bus(struct pci_bus *bus)
2003 void __weak pcibios_remove_bus(struct pci_bus *bus)
2007 struct pci_bus *pci_create_root_bus(struct device *parent, int bus,
2008 struct pci_ops *ops, void *sysdata, struct list_head *resources)
2011 struct pci_host_bridge *bridge;
2012 struct pci_bus *b, *b2;
2013 struct resource_entry *window, *n;
2014 struct resource *res;
2015 resource_size_t offset;
2019 b = pci_alloc_bus(NULL);
2023 b->sysdata = sysdata;
2025 b->number = b->busn_res.start = bus;
2026 pci_bus_assign_domain_nr(b, parent);
2027 b2 = pci_find_bus(pci_domain_nr(b), bus);
2029 /* If we already got to this bus through a different bridge, ignore it */
2030 dev_dbg(&b2->dev, "bus already known\n");
2034 bridge = pci_alloc_host_bridge(b);
2038 bridge->dev.parent = parent;
2039 bridge->dev.release = pci_release_host_bridge_dev;
2040 dev_set_name(&bridge->dev, "pci%04x:%02x", pci_domain_nr(b), bus);
2041 error = pcibios_root_bridge_prepare(bridge);
2047 error = device_register(&bridge->dev);
2049 put_device(&bridge->dev);
2052 b->bridge = get_device(&bridge->dev);
2053 device_enable_async_suspend(b->bridge);
2054 pci_set_bus_of_node(b);
2055 pci_set_bus_msi_domain(b);
2058 set_dev_node(b->bridge, pcibus_to_node(b));
2060 b->dev.class = &pcibus_class;
2061 b->dev.parent = b->bridge;
2062 dev_set_name(&b->dev, "%04x:%02x", pci_domain_nr(b), bus);
2063 error = device_register(&b->dev);
2065 goto class_dev_reg_err;
2069 /* Create legacy_io and legacy_mem files for this bus */
2070 pci_create_legacy_files(b);
2073 dev_info(parent, "PCI host bridge to bus %s\n", dev_name(&b->dev));
2075 printk(KERN_INFO "PCI host bridge to bus %s\n", dev_name(&b->dev));
2077 /* Add initial resources to the bus */
2078 resource_list_for_each_entry_safe(window, n, resources) {
2079 list_move_tail(&window->node, &bridge->windows);
2081 offset = window->offset;
2082 if (res->flags & IORESOURCE_BUS)
2083 pci_bus_insert_busn_res(b, bus, res->end);
2085 pci_bus_add_resource(b, res, 0);
2087 if (resource_type(res) == IORESOURCE_IO)
2088 fmt = " (bus address [%#06llx-%#06llx])";
2090 fmt = " (bus address [%#010llx-%#010llx])";
2091 snprintf(bus_addr, sizeof(bus_addr), fmt,
2092 (unsigned long long) (res->start - offset),
2093 (unsigned long long) (res->end - offset));
2096 dev_info(&b->dev, "root bus resource %pR%s\n", res, bus_addr);
2099 down_write(&pci_bus_sem);
2100 list_add_tail(&b->node, &pci_root_buses);
2101 up_write(&pci_bus_sem);
2106 put_device(&bridge->dev);
2107 device_unregister(&bridge->dev);
2112 EXPORT_SYMBOL_GPL(pci_create_root_bus);
2114 int pci_bus_insert_busn_res(struct pci_bus *b, int bus, int bus_max)
2116 struct resource *res = &b->busn_res;
2117 struct resource *parent_res, *conflict;
2121 res->flags = IORESOURCE_BUS;
2123 if (!pci_is_root_bus(b))
2124 parent_res = &b->parent->busn_res;
2126 parent_res = get_pci_domain_busn_res(pci_domain_nr(b));
2127 res->flags |= IORESOURCE_PCI_FIXED;
2130 conflict = request_resource_conflict(parent_res, res);
2133 dev_printk(KERN_DEBUG, &b->dev,
2134 "busn_res: can not insert %pR under %s%pR (conflicts with %s %pR)\n",
2135 res, pci_is_root_bus(b) ? "domain " : "",
2136 parent_res, conflict->name, conflict);
2138 return conflict == NULL;
2141 int pci_bus_update_busn_res_end(struct pci_bus *b, int bus_max)
2143 struct resource *res = &b->busn_res;
2144 struct resource old_res = *res;
2145 resource_size_t size;
2148 if (res->start > bus_max)
2151 size = bus_max - res->start + 1;
2152 ret = adjust_resource(res, res->start, size);
2153 dev_printk(KERN_DEBUG, &b->dev,
2154 "busn_res: %pR end %s updated to %02x\n",
2155 &old_res, ret ? "can not be" : "is", bus_max);
2157 if (!ret && !res->parent)
2158 pci_bus_insert_busn_res(b, res->start, res->end);
2163 void pci_bus_release_busn_res(struct pci_bus *b)
2165 struct resource *res = &b->busn_res;
2168 if (!res->flags || !res->parent)
2171 ret = release_resource(res);
2172 dev_printk(KERN_DEBUG, &b->dev,
2173 "busn_res: %pR %s released\n",
2174 res, ret ? "can not be" : "is");
2177 struct pci_bus *pci_scan_root_bus_msi(struct device *parent, int bus,
2178 struct pci_ops *ops, void *sysdata,
2179 struct list_head *resources, struct msi_controller *msi)
2181 struct resource_entry *window;
2186 resource_list_for_each_entry(window, resources)
2187 if (window->res->flags & IORESOURCE_BUS) {
2192 b = pci_create_root_bus(parent, bus, ops, sysdata, resources);
2200 "No busn resource found for root bus, will use [bus %02x-ff]\n",
2202 pci_bus_insert_busn_res(b, bus, 255);
2205 max = pci_scan_child_bus(b);
2208 pci_bus_update_busn_res_end(b, max);
2213 struct pci_bus *pci_scan_root_bus(struct device *parent, int bus,
2214 struct pci_ops *ops, void *sysdata, struct list_head *resources)
2216 return pci_scan_root_bus_msi(parent, bus, ops, sysdata, resources,
2219 EXPORT_SYMBOL(pci_scan_root_bus);
2221 struct pci_bus *pci_scan_bus(int bus, struct pci_ops *ops,
2224 LIST_HEAD(resources);
2227 pci_add_resource(&resources, &ioport_resource);
2228 pci_add_resource(&resources, &iomem_resource);
2229 pci_add_resource(&resources, &busn_resource);
2230 b = pci_create_root_bus(NULL, bus, ops, sysdata, &resources);
2232 pci_scan_child_bus(b);
2234 pci_free_resource_list(&resources);
2238 EXPORT_SYMBOL(pci_scan_bus);
2241 * pci_rescan_bus_bridge_resize - scan a PCI bus for devices.
2242 * @bridge: PCI bridge for the bus to scan
2244 * Scan a PCI bus and child buses for new devices, add them,
2245 * and enable them, resizing bridge mmio/io resource if necessary
2246 * and possible. The caller must ensure the child devices are already
2247 * removed for resizing to occur.
2249 * Returns the max number of subordinate bus discovered.
2251 unsigned int pci_rescan_bus_bridge_resize(struct pci_dev *bridge)
2254 struct pci_bus *bus = bridge->subordinate;
2256 max = pci_scan_child_bus(bus);
2258 pci_assign_unassigned_bridge_resources(bridge);
2260 pci_bus_add_devices(bus);
2266 * pci_rescan_bus - scan a PCI bus for devices.
2267 * @bus: PCI bus to scan
2269 * Scan a PCI bus and child buses for new devices, adds them,
2272 * Returns the max number of subordinate bus discovered.
2274 unsigned int pci_rescan_bus(struct pci_bus *bus)
2278 max = pci_scan_child_bus(bus);
2279 pci_assign_unassigned_bus_resources(bus);
2280 pci_bus_add_devices(bus);
2284 EXPORT_SYMBOL_GPL(pci_rescan_bus);
2287 * pci_rescan_bus(), pci_rescan_bus_bridge_resize() and PCI device removal
2288 * routines should always be executed under this mutex.
2290 static DEFINE_MUTEX(pci_rescan_remove_lock);
2292 void pci_lock_rescan_remove(void)
2294 mutex_lock(&pci_rescan_remove_lock);
2296 EXPORT_SYMBOL_GPL(pci_lock_rescan_remove);
2298 void pci_unlock_rescan_remove(void)
2300 mutex_unlock(&pci_rescan_remove_lock);
2302 EXPORT_SYMBOL_GPL(pci_unlock_rescan_remove);
2304 static int __init pci_sort_bf_cmp(const struct device *d_a,
2305 const struct device *d_b)
2307 const struct pci_dev *a = to_pci_dev(d_a);
2308 const struct pci_dev *b = to_pci_dev(d_b);
2310 if (pci_domain_nr(a->bus) < pci_domain_nr(b->bus)) return -1;
2311 else if (pci_domain_nr(a->bus) > pci_domain_nr(b->bus)) return 1;
2313 if (a->bus->number < b->bus->number) return -1;
2314 else if (a->bus->number > b->bus->number) return 1;
2316 if (a->devfn < b->devfn) return -1;
2317 else if (a->devfn > b->devfn) return 1;
2322 void __init pci_sort_breadthfirst(void)
2324 bus_sort_breadthfirst(&pci_bus_type, &pci_sort_bf_cmp);