2 * Copyright (c) 2014 Google, Inc
3 * Written by Simon Glass <sjg@chromium.org>
5 * SPDX-License-Identifier: GPL-2.0+
16 #include <dm/device-internal.h>
17 #if defined(CONFIG_X86) && defined(CONFIG_HAVE_FSP)
18 #include <asm/fsp/fsp_support.h>
21 DECLARE_GLOBAL_DATA_PTR;
23 static int pci_get_bus(int busnum, struct udevice **busp)
27 ret = uclass_get_device_by_seq(UCLASS_PCI, busnum, busp);
29 /* Since buses may not be numbered yet try a little harder with bus 0 */
31 ret = uclass_first_device(UCLASS_PCI, busp);
36 ret = uclass_get_device_by_seq(UCLASS_PCI, busnum, busp);
42 struct pci_controller *pci_bus_to_hose(int busnum)
47 ret = pci_get_bus(busnum, &bus);
49 debug("%s: Cannot get bus %d: ret=%d\n", __func__, busnum, ret);
53 return dev_get_uclass_priv(bus);
56 pci_dev_t pci_get_bdf(struct udevice *dev)
58 struct pci_child_platdata *pplat = dev_get_parent_platdata(dev);
59 struct udevice *bus = dev->parent;
61 return PCI_ADD_BUS(bus->seq, pplat->devfn);
65 * pci_get_bus_max() - returns the bus number of the last active bus
67 * @return last bus number, or -1 if no active buses
69 static int pci_get_bus_max(void)
75 ret = uclass_get(UCLASS_PCI, &uc);
76 uclass_foreach_dev(bus, uc) {
81 debug("%s: ret=%d\n", __func__, ret);
86 int pci_last_busno(void)
88 struct pci_controller *hose;
93 debug("pci_last_busno\n");
94 ret = uclass_get(UCLASS_PCI, &uc);
95 if (ret || list_empty(&uc->dev_head))
98 /* Probe the last bus */
99 bus = list_entry(uc->dev_head.prev, struct udevice, uclass_node);
100 debug("bus = %p, %s\n", bus, bus->name);
102 ret = device_probe(bus);
106 /* If that bus has bridges, we may have new buses now. Get the last */
107 bus = list_entry(uc->dev_head.prev, struct udevice, uclass_node);
108 hose = dev_get_uclass_priv(bus);
109 debug("bus = %s, hose = %p\n", bus->name, hose);
111 return hose->last_busno;
114 int pci_get_ff(enum pci_size_t size)
126 int pci_bus_find_devfn(struct udevice *bus, pci_dev_t find_devfn,
127 struct udevice **devp)
131 for (device_find_first_child(bus, &dev);
133 device_find_next_child(&dev)) {
134 struct pci_child_platdata *pplat;
136 pplat = dev_get_parent_platdata(dev);
137 if (pplat && pplat->devfn == find_devfn) {
146 int pci_bus_find_bdf(pci_dev_t bdf, struct udevice **devp)
151 ret = pci_get_bus(PCI_BUS(bdf), &bus);
154 return pci_bus_find_devfn(bus, PCI_MASK_BUS(bdf), devp);
157 static int pci_device_matches_ids(struct udevice *dev,
158 struct pci_device_id *ids)
160 struct pci_child_platdata *pplat;
163 pplat = dev_get_parent_platdata(dev);
166 for (i = 0; ids[i].vendor != 0; i++) {
167 if (pplat->vendor == ids[i].vendor &&
168 pplat->device == ids[i].device)
175 int pci_bus_find_devices(struct udevice *bus, struct pci_device_id *ids,
176 int *indexp, struct udevice **devp)
180 /* Scan all devices on this bus */
181 for (device_find_first_child(bus, &dev);
183 device_find_next_child(&dev)) {
184 if (pci_device_matches_ids(dev, ids) >= 0) {
185 if ((*indexp)-- <= 0) {
195 int pci_find_device_id(struct pci_device_id *ids, int index,
196 struct udevice **devp)
200 /* Scan all known buses */
201 for (uclass_first_device(UCLASS_PCI, &bus);
203 uclass_next_device(&bus)) {
204 if (!pci_bus_find_devices(bus, ids, &index, devp))
212 int pci_bus_write_config(struct udevice *bus, pci_dev_t bdf, int offset,
213 unsigned long value, enum pci_size_t size)
215 struct dm_pci_ops *ops;
217 ops = pci_get_ops(bus);
218 if (!ops->write_config)
220 return ops->write_config(bus, bdf, offset, value, size);
223 int pci_write_config(pci_dev_t bdf, int offset, unsigned long value,
224 enum pci_size_t size)
229 ret = pci_get_bus(PCI_BUS(bdf), &bus);
233 return pci_bus_write_config(bus, bdf, offset, value, size);
236 int dm_pci_write_config(struct udevice *dev, int offset, unsigned long value,
237 enum pci_size_t size)
241 for (bus = dev; device_is_on_pci_bus(bus);)
243 return pci_bus_write_config(bus, pci_get_bdf(dev), offset, value, size);
247 int pci_write_config32(pci_dev_t bdf, int offset, u32 value)
249 return pci_write_config(bdf, offset, value, PCI_SIZE_32);
252 int pci_write_config16(pci_dev_t bdf, int offset, u16 value)
254 return pci_write_config(bdf, offset, value, PCI_SIZE_16);
257 int pci_write_config8(pci_dev_t bdf, int offset, u8 value)
259 return pci_write_config(bdf, offset, value, PCI_SIZE_8);
262 int dm_pci_write_config8(struct udevice *dev, int offset, u8 value)
264 return dm_pci_write_config(dev, offset, value, PCI_SIZE_8);
267 int dm_pci_write_config16(struct udevice *dev, int offset, u16 value)
269 return dm_pci_write_config(dev, offset, value, PCI_SIZE_16);
272 int dm_pci_write_config32(struct udevice *dev, int offset, u32 value)
274 return dm_pci_write_config(dev, offset, value, PCI_SIZE_32);
277 int pci_bus_read_config(struct udevice *bus, pci_dev_t bdf, int offset,
278 unsigned long *valuep, enum pci_size_t size)
280 struct dm_pci_ops *ops;
282 ops = pci_get_ops(bus);
283 if (!ops->read_config)
285 return ops->read_config(bus, bdf, offset, valuep, size);
288 int pci_read_config(pci_dev_t bdf, int offset, unsigned long *valuep,
289 enum pci_size_t size)
294 ret = pci_get_bus(PCI_BUS(bdf), &bus);
298 return pci_bus_read_config(bus, bdf, offset, valuep, size);
301 int dm_pci_read_config(struct udevice *dev, int offset, unsigned long *valuep,
302 enum pci_size_t size)
306 for (bus = dev; device_is_on_pci_bus(bus);)
308 return pci_bus_read_config(bus, pci_get_bdf(dev), offset, valuep,
312 int pci_read_config32(pci_dev_t bdf, int offset, u32 *valuep)
317 ret = pci_read_config(bdf, offset, &value, PCI_SIZE_32);
325 int pci_read_config16(pci_dev_t bdf, int offset, u16 *valuep)
330 ret = pci_read_config(bdf, offset, &value, PCI_SIZE_16);
338 int pci_read_config8(pci_dev_t bdf, int offset, u8 *valuep)
343 ret = pci_read_config(bdf, offset, &value, PCI_SIZE_8);
351 int dm_pci_read_config8(struct udevice *dev, int offset, u8 *valuep)
356 ret = dm_pci_read_config(dev, offset, &value, PCI_SIZE_8);
364 int dm_pci_read_config16(struct udevice *dev, int offset, u16 *valuep)
369 ret = dm_pci_read_config(dev, offset, &value, PCI_SIZE_16);
377 int dm_pci_read_config32(struct udevice *dev, int offset, u32 *valuep)
382 ret = dm_pci_read_config(dev, offset, &value, PCI_SIZE_32);
390 int pci_auto_config_devices(struct udevice *bus)
392 struct pci_controller *hose = bus->uclass_priv;
393 unsigned int sub_bus;
398 debug("%s: start\n", __func__);
399 pciauto_config_init(hose);
400 for (ret = device_find_first_child(bus, &dev);
402 ret = device_find_next_child(&dev)) {
403 unsigned int max_bus;
405 debug("%s: device %s\n", __func__, dev->name);
406 max_bus = pciauto_config_device(hose, pci_get_bdf(dev));
407 sub_bus = max(sub_bus, max_bus);
409 debug("%s: done\n", __func__);
414 int dm_pci_hose_probe_bus(struct pci_controller *hose, pci_dev_t bdf)
416 struct udevice *parent, *bus;
420 debug("%s\n", __func__);
423 /* Find the bus within the parent */
424 ret = pci_bus_find_devfn(parent, PCI_MASK_BUS(bdf), &bus);
426 debug("%s: Cannot find device %x on bus %s: %d\n", __func__,
427 bdf, parent->name, ret);
431 sub_bus = pci_get_bus_max() + 1;
432 debug("%s: bus = %d/%s\n", __func__, sub_bus, bus->name);
433 pciauto_prescan_setup_bridge(hose, bdf, sub_bus);
435 ret = device_probe(bus);
437 debug("%s: Cannot probe bus bus %s: %d\n", __func__, bus->name,
441 if (sub_bus != bus->seq) {
442 printf("%s: Internal error, bus '%s' got seq %d, expected %d\n",
443 __func__, bus->name, bus->seq, sub_bus);
446 sub_bus = pci_get_bus_max();
447 pciauto_postscan_setup_bridge(hose, bdf, sub_bus);
453 * pci_match_one_device - Tell if a PCI device structure has a matching
454 * PCI device id structure
455 * @id: single PCI device id structure to match
456 * @dev: the PCI device structure to match against
458 * Returns the matching pci_device_id structure or %NULL if there is no match.
460 static bool pci_match_one_id(const struct pci_device_id *id,
461 const struct pci_device_id *find)
463 if ((id->vendor == PCI_ANY_ID || id->vendor == find->vendor) &&
464 (id->device == PCI_ANY_ID || id->device == find->device) &&
465 (id->subvendor == PCI_ANY_ID || id->subvendor == find->subvendor) &&
466 (id->subdevice == PCI_ANY_ID || id->subdevice == find->subdevice) &&
467 !((id->class ^ find->class) & id->class_mask))
474 * pci_find_and_bind_driver() - Find and bind the right PCI driver
476 * This only looks at certain fields in the descriptor.
478 static int pci_find_and_bind_driver(struct udevice *parent,
479 struct pci_device_id *find_id, pci_dev_t bdf,
480 struct udevice **devp)
482 struct pci_driver_entry *start, *entry;
491 debug("%s: Searching for driver: vendor=%x, device=%x\n", __func__,
492 find_id->vendor, find_id->device);
493 start = ll_entry_start(struct pci_driver_entry, pci_driver_entry);
494 n_ents = ll_entry_count(struct pci_driver_entry, pci_driver_entry);
495 for (entry = start; entry != start + n_ents; entry++) {
496 const struct pci_device_id *id;
498 const struct driver *drv;
500 for (id = entry->match;
501 id->vendor || id->subvendor || id->class_mask;
503 if (!pci_match_one_id(id, find_id))
509 * In the pre-relocation phase, we only bind devices
510 * whose driver has the DM_FLAG_PRE_RELOC set, to save
511 * precious memory space as on some platforms as that
512 * space is pretty limited (ie: using Cache As RAM).
514 if (!(gd->flags & GD_FLG_RELOC) &&
515 !(drv->flags & DM_FLAG_PRE_RELOC))
519 * We could pass the descriptor to the driver as
520 * platdata (instead of NULL) and allow its bind()
521 * method to return -ENOENT if it doesn't support this
522 * device. That way we could continue the search to
523 * find another driver. For now this doesn't seem
524 * necesssary, so just bind the first match.
526 ret = device_bind(parent, drv, drv->name, NULL, -1,
530 debug("%s: Match found: %s\n", __func__, drv->name);
531 dev->driver_data = find_id->driver_data;
537 bridge = (find_id->class >> 8) == PCI_CLASS_BRIDGE_PCI;
539 * In the pre-relocation phase, we only bind bridge devices to save
540 * precious memory space as on some platforms as that space is pretty
541 * limited (ie: using Cache As RAM).
543 if (!(gd->flags & GD_FLG_RELOC) && !bridge)
546 /* Bind a generic driver so that the device can be used */
547 sprintf(name, "pci_%x:%x.%x", parent->seq, PCI_DEV(bdf),
552 drv = bridge ? "pci_bridge_drv" : "pci_generic_drv";
554 ret = device_bind_driver(parent, drv, str, devp);
556 debug("%s: Failed to bind generic driver: %d", __func__, ret);
559 debug("%s: No match found: bound generic driver instead\n", __func__);
564 debug("%s: No match found: error %d\n", __func__, ret);
568 int pci_bind_bus_devices(struct udevice *bus)
570 ulong vendor, device;
577 end = PCI_BDF(bus->seq, PCI_MAX_PCI_DEVICES - 1,
578 PCI_MAX_PCI_FUNCTIONS - 1);
579 for (bdf = PCI_BDF(bus->seq, 0, 0); bdf < end;
580 bdf += PCI_BDF(0, 0, 1)) {
581 struct pci_child_platdata *pplat;
585 if (PCI_FUNC(bdf) && !found_multi)
587 /* Check only the first access, we don't expect problems */
588 ret = pci_bus_read_config(bus, bdf, PCI_HEADER_TYPE,
589 &header_type, PCI_SIZE_8);
592 pci_bus_read_config(bus, bdf, PCI_VENDOR_ID, &vendor,
594 if (vendor == 0xffff || vendor == 0x0000)
598 found_multi = header_type & 0x80;
600 debug("%s: bus %d/%s: found device %x, function %d\n", __func__,
601 bus->seq, bus->name, PCI_DEV(bdf), PCI_FUNC(bdf));
602 pci_bus_read_config(bus, bdf, PCI_DEVICE_ID, &device,
604 pci_bus_read_config(bus, bdf, PCI_CLASS_REVISION, &class,
608 /* Find this device in the device tree */
609 ret = pci_bus_find_devfn(bus, PCI_MASK_BUS(bdf), &dev);
611 /* Search for a driver */
613 /* If nothing in the device tree, bind a generic device */
614 if (ret == -ENODEV) {
615 struct pci_device_id find_id;
618 memset(&find_id, '\0', sizeof(find_id));
619 find_id.vendor = vendor;
620 find_id.device = device;
621 find_id.class = class;
622 if ((header_type & 0x7f) == PCI_HEADER_TYPE_NORMAL) {
623 pci_bus_read_config(bus, bdf,
624 PCI_SUBSYSTEM_VENDOR_ID,
626 find_id.subvendor = val & 0xffff;
627 find_id.subdevice = val >> 16;
629 ret = pci_find_and_bind_driver(bus, &find_id, bdf,
635 /* Update the platform data */
637 pplat = dev_get_parent_platdata(dev);
638 pplat->devfn = PCI_MASK_BUS(bdf);
639 pplat->vendor = vendor;
640 pplat->device = device;
641 pplat->class = class;
647 printf("Cannot read bus configuration: %d\n", ret);
652 static int pci_uclass_post_bind(struct udevice *bus)
655 * If there is no pci device listed in the device tree,
656 * don't bother scanning the device tree.
658 if (bus->of_offset == -1)
662 * Scan the device tree for devices. This does not probe the PCI bus,
663 * as this is not permitted while binding. It just finds devices
664 * mentioned in the device tree.
666 * Before relocation, only bind devices marked for pre-relocation
669 return dm_scan_fdt_node(bus, gd->fdt_blob, bus->of_offset,
670 gd->flags & GD_FLG_RELOC ? false : true);
673 static int decode_regions(struct pci_controller *hose, const void *blob,
674 int parent_node, int node)
676 int pci_addr_cells, addr_cells, size_cells;
677 int cells_per_record;
683 prop = fdt_getprop(blob, node, "ranges", &len);
686 pci_addr_cells = fdt_address_cells(blob, node);
687 addr_cells = fdt_address_cells(blob, parent_node);
688 size_cells = fdt_size_cells(blob, node);
690 /* PCI addresses are always 3-cells */
692 cells_per_record = pci_addr_cells + addr_cells + size_cells;
693 hose->region_count = 0;
694 debug("%s: len=%d, cells_per_record=%d\n", __func__, len,
696 for (i = 0; i < MAX_PCI_REGIONS; i++, len -= cells_per_record) {
697 u64 pci_addr, addr, size;
702 if (len < cells_per_record)
704 flags = fdt32_to_cpu(prop[0]);
705 space_code = (flags >> 24) & 3;
706 pci_addr = fdtdec_get_number(prop + 1, 2);
707 prop += pci_addr_cells;
708 addr = fdtdec_get_number(prop, addr_cells);
710 size = fdtdec_get_number(prop, size_cells);
712 debug("%s: region %d, pci_addr=%" PRIx64 ", addr=%" PRIx64
713 ", size=%" PRIx64 ", space_code=%d\n", __func__,
714 hose->region_count, pci_addr, addr, size, space_code);
715 if (space_code & 2) {
716 type = flags & (1U << 30) ? PCI_REGION_PREFETCH :
718 } else if (space_code & 1) {
719 type = PCI_REGION_IO;
723 debug(" - type=%d\n", type);
724 pci_set_region(hose->regions + hose->region_count++, pci_addr,
728 /* Add a region for our local memory */
730 if (gd->pci_ram_top && gd->pci_ram_top < addr)
731 addr = gd->pci_ram_top;
732 pci_set_region(hose->regions + hose->region_count++, 0, 0, addr,
733 PCI_REGION_MEM | PCI_REGION_SYS_MEMORY);
738 static int pci_uclass_pre_probe(struct udevice *bus)
740 struct pci_controller *hose;
743 debug("%s, bus=%d/%s, parent=%s\n", __func__, bus->seq, bus->name,
745 hose = bus->uclass_priv;
747 /* For bridges, use the top-level PCI controller */
748 if (device_get_uclass_id(bus->parent) == UCLASS_ROOT) {
750 ret = decode_regions(hose, gd->fdt_blob, bus->parent->of_offset,
753 debug("%s: Cannot decode regions\n", __func__);
757 struct pci_controller *parent_hose;
759 parent_hose = dev_get_uclass_priv(bus->parent);
760 hose->ctlr = parent_hose->bus;
763 hose->first_busno = bus->seq;
764 hose->last_busno = bus->seq;
769 static int pci_uclass_post_probe(struct udevice *bus)
773 debug("%s: probing bus %d\n", __func__, bus->seq);
774 ret = pci_bind_bus_devices(bus);
778 #ifdef CONFIG_PCI_PNP
779 ret = pci_auto_config_devices(bus);
782 #if defined(CONFIG_X86) && defined(CONFIG_HAVE_FSP)
784 * Per Intel FSP specification, we should call FSP notify API to
785 * inform FSP that PCI enumeration has been done so that FSP will
786 * do any necessary initialization as required by the chipset's
787 * BIOS Writer's Guide (BWG).
789 * Unfortunately we have to put this call here as with driver model,
790 * the enumeration is all done on a lazy basis as needed, so until
791 * something is touched on PCI it won't happen.
793 * Note we only call this 1) after U-Boot is relocated, and 2)
794 * root bus has finished probing.
796 if ((gd->flags & GD_FLG_RELOC) && (bus->seq == 0))
797 ret = fsp_init_phase_pci();
800 return ret < 0 ? ret : 0;
803 static int pci_uclass_child_post_bind(struct udevice *dev)
805 struct pci_child_platdata *pplat;
806 struct fdt_pci_addr addr;
809 if (dev->of_offset == -1)
813 * We could read vendor, device, class if available. But for now we
814 * just check the address.
816 pplat = dev_get_parent_platdata(dev);
817 ret = fdtdec_get_pci_addr(gd->fdt_blob, dev->of_offset,
818 FDT_PCI_SPACE_CONFIG, "reg", &addr);
824 /* extract the devfn from fdt_pci_addr */
825 pplat->devfn = addr.phys_hi & 0xff00;
831 static int pci_bridge_read_config(struct udevice *bus, pci_dev_t bdf,
832 uint offset, ulong *valuep,
833 enum pci_size_t size)
835 struct pci_controller *hose = bus->uclass_priv;
837 return pci_bus_read_config(hose->ctlr, bdf, offset, valuep, size);
840 static int pci_bridge_write_config(struct udevice *bus, pci_dev_t bdf,
841 uint offset, ulong value,
842 enum pci_size_t size)
844 struct pci_controller *hose = bus->uclass_priv;
846 return pci_bus_write_config(hose->ctlr, bdf, offset, value, size);
849 static int skip_to_next_device(struct udevice *bus, struct udevice **devp)
855 * Scan through all the PCI controllers. On x86 there will only be one
856 * but that is not necessarily true on other hardware.
859 device_find_first_child(bus, &dev);
864 ret = uclass_next_device(&bus);
872 int pci_find_next_device(struct udevice **devp)
874 struct udevice *child = *devp;
875 struct udevice *bus = child->parent;
878 /* First try all the siblings */
881 device_find_next_child(&child);
888 /* We ran out of siblings. Try the next bus */
889 ret = uclass_next_device(&bus);
893 return bus ? skip_to_next_device(bus, devp) : 0;
896 int pci_find_first_device(struct udevice **devp)
902 ret = uclass_first_device(UCLASS_PCI, &bus);
906 return skip_to_next_device(bus, devp);
909 UCLASS_DRIVER(pci) = {
912 .flags = DM_UC_FLAG_SEQ_ALIAS,
913 .post_bind = pci_uclass_post_bind,
914 .pre_probe = pci_uclass_pre_probe,
915 .post_probe = pci_uclass_post_probe,
916 .child_post_bind = pci_uclass_child_post_bind,
917 .per_device_auto_alloc_size = sizeof(struct pci_controller),
918 .per_child_platdata_auto_alloc_size =
919 sizeof(struct pci_child_platdata),
922 static const struct dm_pci_ops pci_bridge_ops = {
923 .read_config = pci_bridge_read_config,
924 .write_config = pci_bridge_write_config,
927 static const struct udevice_id pci_bridge_ids[] = {
928 { .compatible = "pci-bridge" },
932 U_BOOT_DRIVER(pci_bridge_drv) = {
933 .name = "pci_bridge_drv",
935 .of_match = pci_bridge_ids,
936 .ops = &pci_bridge_ops,
939 UCLASS_DRIVER(pci_generic) = {
940 .id = UCLASS_PCI_GENERIC,
941 .name = "pci_generic",
944 static const struct udevice_id pci_generic_ids[] = {
945 { .compatible = "pci-generic" },
949 U_BOOT_DRIVER(pci_generic_drv) = {
950 .name = "pci_generic_drv",
951 .id = UCLASS_PCI_GENERIC,
952 .of_match = pci_generic_ids,