1 // SPDX-License-Identifier: GPL-2.0+
3 * Copyright (c) 2014 Google, Inc
7 #define LOG_CATEGORY UCLASS_PCI
16 #include <asm/global_data.h>
18 #include <dm/device-internal.h>
20 #include <dm/uclass-internal.h>
21 #if defined(CONFIG_X86) && defined(CONFIG_HAVE_FSP)
22 #include <asm/fsp/fsp_support.h>
24 #include <dt-bindings/pci/pci.h>
25 #include <linux/delay.h>
26 #include "pci_internal.h"
28 DECLARE_GLOBAL_DATA_PTR;
30 int pci_get_bus(int busnum, struct udevice **busp)
34 ret = uclass_get_device_by_seq(UCLASS_PCI, busnum, busp);
36 /* Since buses may not be numbered yet try a little harder with bus 0 */
38 ret = uclass_first_device_err(UCLASS_PCI, busp);
41 ret = uclass_get_device_by_seq(UCLASS_PCI, busnum, busp);
47 struct udevice *pci_get_controller(struct udevice *dev)
49 while (device_is_on_pci_bus(dev))
55 pci_dev_t dm_pci_get_bdf(const struct udevice *dev)
57 struct pci_child_plat *pplat = dev_get_parent_plat(dev);
58 struct udevice *bus = dev->parent;
61 * This error indicates that @dev is a device on an unprobed PCI bus.
62 * The bus likely has bus=seq == -1, so the PCI_ADD_BUS() macro below
63 * will produce a bad BDF>
65 * A common cause of this problem is that this function is called in the
66 * of_to_plat() method of @dev. Accessing the PCI bus in that
67 * method is not allowed, since it has not yet been probed. To fix this,
68 * move that access to the probe() method of @dev instead.
70 if (!device_active(bus))
71 log_err("PCI: Device '%s' on unprobed bus '%s'\n", dev->name,
73 return PCI_ADD_BUS(dev_seq(bus), pplat->devfn);
77 * pci_get_bus_max() - returns the bus number of the last active bus
79 * @return last bus number, or -1 if no active buses
81 static int pci_get_bus_max(void)
87 ret = uclass_get(UCLASS_PCI, &uc);
88 uclass_foreach_dev(bus, uc) {
89 if (dev_seq(bus) > ret)
93 debug("%s: ret=%d\n", __func__, ret);
98 int pci_last_busno(void)
100 return pci_get_bus_max();
103 int pci_get_ff(enum pci_size_t size)
115 static void pci_dev_find_ofnode(struct udevice *bus, phys_addr_t bdf,
118 struct fdt_pci_addr addr;
122 dev_for_each_subnode(node, bus) {
123 ret = ofnode_read_pci_addr(node, FDT_PCI_SPACE_CONFIG, "reg",
128 if (PCI_MASK_BUS(addr.phys_hi) != PCI_MASK_BUS(bdf))
136 int pci_bus_find_devfn(const struct udevice *bus, pci_dev_t find_devfn,
137 struct udevice **devp)
141 for (device_find_first_child(bus, &dev);
143 device_find_next_child(&dev)) {
144 struct pci_child_plat *pplat;
146 pplat = dev_get_parent_plat(dev);
147 if (pplat && pplat->devfn == find_devfn) {
156 int dm_pci_bus_find_bdf(pci_dev_t bdf, struct udevice **devp)
161 ret = pci_get_bus(PCI_BUS(bdf), &bus);
164 return pci_bus_find_devfn(bus, PCI_MASK_BUS(bdf), devp);
167 static int pci_device_matches_ids(struct udevice *dev,
168 const struct pci_device_id *ids)
170 struct pci_child_plat *pplat;
173 pplat = dev_get_parent_plat(dev);
176 for (i = 0; ids[i].vendor != 0; i++) {
177 if (pplat->vendor == ids[i].vendor &&
178 pplat->device == ids[i].device)
185 int pci_bus_find_devices(struct udevice *bus, const struct pci_device_id *ids,
186 int *indexp, struct udevice **devp)
190 /* Scan all devices on this bus */
191 for (device_find_first_child(bus, &dev);
193 device_find_next_child(&dev)) {
194 if (pci_device_matches_ids(dev, ids) >= 0) {
195 if ((*indexp)-- <= 0) {
205 int pci_find_device_id(const struct pci_device_id *ids, int index,
206 struct udevice **devp)
210 /* Scan all known buses */
211 for (uclass_first_device(UCLASS_PCI, &bus);
213 uclass_next_device(&bus)) {
214 if (!pci_bus_find_devices(bus, ids, &index, devp))
222 static int dm_pci_bus_find_device(struct udevice *bus, unsigned int vendor,
223 unsigned int device, int *indexp,
224 struct udevice **devp)
226 struct pci_child_plat *pplat;
229 for (device_find_first_child(bus, &dev);
231 device_find_next_child(&dev)) {
232 pplat = dev_get_parent_plat(dev);
233 if (pplat->vendor == vendor && pplat->device == device) {
244 int dm_pci_find_device(unsigned int vendor, unsigned int device, int index,
245 struct udevice **devp)
249 /* Scan all known buses */
250 for (uclass_first_device(UCLASS_PCI, &bus);
252 uclass_next_device(&bus)) {
253 if (!dm_pci_bus_find_device(bus, vendor, device, &index, devp))
254 return device_probe(*devp);
261 int dm_pci_find_class(uint find_class, int index, struct udevice **devp)
265 /* Scan all known buses */
266 for (pci_find_first_device(&dev);
268 pci_find_next_device(&dev)) {
269 struct pci_child_plat *pplat = dev_get_parent_plat(dev);
271 if (pplat->class == find_class && !index--) {
273 return device_probe(*devp);
281 int pci_bus_write_config(struct udevice *bus, pci_dev_t bdf, int offset,
282 unsigned long value, enum pci_size_t size)
284 struct dm_pci_ops *ops;
286 ops = pci_get_ops(bus);
287 if (!ops->write_config)
289 return ops->write_config(bus, bdf, offset, value, size);
292 int pci_bus_clrset_config32(struct udevice *bus, pci_dev_t bdf, int offset,
298 ret = pci_bus_read_config(bus, bdf, offset, &val, PCI_SIZE_32);
304 return pci_bus_write_config(bus, bdf, offset, val, PCI_SIZE_32);
307 static int pci_write_config(pci_dev_t bdf, int offset, unsigned long value,
308 enum pci_size_t size)
313 ret = pci_get_bus(PCI_BUS(bdf), &bus);
317 return pci_bus_write_config(bus, bdf, offset, value, size);
320 int dm_pci_write_config(struct udevice *dev, int offset, unsigned long value,
321 enum pci_size_t size)
325 for (bus = dev; device_is_on_pci_bus(bus);)
327 return pci_bus_write_config(bus, dm_pci_get_bdf(dev), offset, value,
331 int pci_write_config32(pci_dev_t bdf, int offset, u32 value)
333 return pci_write_config(bdf, offset, value, PCI_SIZE_32);
336 int pci_write_config16(pci_dev_t bdf, int offset, u16 value)
338 return pci_write_config(bdf, offset, value, PCI_SIZE_16);
341 int pci_write_config8(pci_dev_t bdf, int offset, u8 value)
343 return pci_write_config(bdf, offset, value, PCI_SIZE_8);
346 int dm_pci_write_config8(struct udevice *dev, int offset, u8 value)
348 return dm_pci_write_config(dev, offset, value, PCI_SIZE_8);
351 int dm_pci_write_config16(struct udevice *dev, int offset, u16 value)
353 return dm_pci_write_config(dev, offset, value, PCI_SIZE_16);
356 int dm_pci_write_config32(struct udevice *dev, int offset, u32 value)
358 return dm_pci_write_config(dev, offset, value, PCI_SIZE_32);
361 int pci_bus_read_config(const struct udevice *bus, pci_dev_t bdf, int offset,
362 unsigned long *valuep, enum pci_size_t size)
364 struct dm_pci_ops *ops;
366 ops = pci_get_ops(bus);
367 if (!ops->read_config)
369 return ops->read_config(bus, bdf, offset, valuep, size);
372 static int pci_read_config(pci_dev_t bdf, int offset, unsigned long *valuep,
373 enum pci_size_t size)
378 ret = pci_get_bus(PCI_BUS(bdf), &bus);
382 return pci_bus_read_config(bus, bdf, offset, valuep, size);
385 int dm_pci_read_config(const struct udevice *dev, int offset,
386 unsigned long *valuep, enum pci_size_t size)
388 const struct udevice *bus;
390 for (bus = dev; device_is_on_pci_bus(bus);)
392 return pci_bus_read_config(bus, dm_pci_get_bdf(dev), offset, valuep,
396 int pci_read_config32(pci_dev_t bdf, int offset, u32 *valuep)
401 ret = pci_read_config(bdf, offset, &value, PCI_SIZE_32);
409 int pci_read_config16(pci_dev_t bdf, int offset, u16 *valuep)
414 ret = pci_read_config(bdf, offset, &value, PCI_SIZE_16);
422 int pci_read_config8(pci_dev_t bdf, int offset, u8 *valuep)
427 ret = pci_read_config(bdf, offset, &value, PCI_SIZE_8);
435 int dm_pci_read_config8(const struct udevice *dev, int offset, u8 *valuep)
440 ret = dm_pci_read_config(dev, offset, &value, PCI_SIZE_8);
448 int dm_pci_read_config16(const struct udevice *dev, int offset, u16 *valuep)
453 ret = dm_pci_read_config(dev, offset, &value, PCI_SIZE_16);
461 int dm_pci_read_config32(const struct udevice *dev, int offset, u32 *valuep)
466 ret = dm_pci_read_config(dev, offset, &value, PCI_SIZE_32);
474 int dm_pci_clrset_config8(struct udevice *dev, int offset, u32 clr, u32 set)
479 ret = dm_pci_read_config8(dev, offset, &val);
485 return dm_pci_write_config8(dev, offset, val);
488 int dm_pci_clrset_config16(struct udevice *dev, int offset, u32 clr, u32 set)
493 ret = dm_pci_read_config16(dev, offset, &val);
499 return dm_pci_write_config16(dev, offset, val);
502 int dm_pci_clrset_config32(struct udevice *dev, int offset, u32 clr, u32 set)
507 ret = dm_pci_read_config32(dev, offset, &val);
513 return dm_pci_write_config32(dev, offset, val);
516 static void set_vga_bridge_bits(struct udevice *dev)
518 struct udevice *parent = dev->parent;
521 while (dev_seq(parent) != 0) {
522 dm_pci_read_config16(parent, PCI_BRIDGE_CONTROL, &bc);
523 bc |= PCI_BRIDGE_CTL_VGA;
524 dm_pci_write_config16(parent, PCI_BRIDGE_CONTROL, bc);
525 parent = parent->parent;
529 int pci_auto_config_devices(struct udevice *bus)
531 struct pci_controller *hose = dev_get_uclass_priv(bus);
532 struct pci_child_plat *pplat;
533 unsigned int sub_bus;
537 sub_bus = dev_seq(bus);
538 debug("%s: start\n", __func__);
539 pciauto_config_init(hose);
540 for (ret = device_find_first_child(bus, &dev);
542 ret = device_find_next_child(&dev)) {
543 unsigned int max_bus;
546 debug("%s: device %s\n", __func__, dev->name);
547 if (dev_has_ofnode(dev) &&
548 dev_read_bool(dev, "pci,no-autoconfig"))
550 ret = dm_pciauto_config_device(dev);
552 return log_msg_ret("auto", ret);
554 sub_bus = max(sub_bus, max_bus);
556 if (dev_get_parent(dev) == bus)
559 pplat = dev_get_parent_plat(dev);
560 if (pplat->class == (PCI_CLASS_DISPLAY_VGA << 8))
561 set_vga_bridge_bits(dev);
563 debug("%s: done\n", __func__);
565 return log_msg_ret("sub", sub_bus);
568 int pci_generic_mmap_write_config(
569 const struct udevice *bus,
570 int (*addr_f)(const struct udevice *bus, pci_dev_t bdf, uint offset,
575 enum pci_size_t size)
579 if (addr_f(bus, bdf, offset, &address) < 0)
584 writeb(value, address);
587 writew(value, address);
590 writel(value, address);
597 int pci_generic_mmap_read_config(
598 const struct udevice *bus,
599 int (*addr_f)(const struct udevice *bus, pci_dev_t bdf, uint offset,
604 enum pci_size_t size)
608 if (addr_f(bus, bdf, offset, &address) < 0) {
609 *valuep = pci_get_ff(size);
615 *valuep = readb(address);
618 *valuep = readw(address);
621 *valuep = readl(address);
628 int dm_pci_hose_probe_bus(struct udevice *bus)
635 debug("%s\n", __func__);
637 ea_pos = dm_pci_find_capability(bus, PCI_CAP_ID_EA);
639 dm_pci_read_config8(bus, ea_pos + sizeof(u32) + sizeof(u8),
643 sub_bus = pci_get_bus_max() + 1;
645 debug("%s: bus = %d/%s\n", __func__, sub_bus, bus->name);
646 dm_pciauto_prescan_setup_bridge(bus, sub_bus);
648 ret = device_probe(bus);
650 debug("%s: Cannot probe bus %s: %d\n", __func__, bus->name,
652 return log_msg_ret("probe", ret);
656 sub_bus = pci_get_bus_max();
658 dm_pciauto_postscan_setup_bridge(bus, sub_bus);
664 * pci_match_one_device - Tell if a PCI device structure has a matching
665 * PCI device id structure
666 * @id: single PCI device id structure to match
667 * @find: the PCI device id structure to match against
669 * Returns true if the finding pci_device_id structure matched or false if
672 static bool pci_match_one_id(const struct pci_device_id *id,
673 const struct pci_device_id *find)
675 if ((id->vendor == PCI_ANY_ID || id->vendor == find->vendor) &&
676 (id->device == PCI_ANY_ID || id->device == find->device) &&
677 (id->subvendor == PCI_ANY_ID || id->subvendor == find->subvendor) &&
678 (id->subdevice == PCI_ANY_ID || id->subdevice == find->subdevice) &&
679 !((id->class ^ find->class) & id->class_mask))
686 * pci_need_device_pre_reloc() - Check if a device should be bound
688 * This checks a list of vendor/device-ID values indicating devices that should
689 * be bound before relocation.
692 * @vendor: Vendor ID to check
693 * @device: Device ID to check
694 * @return true if the vendor/device is in the list, false if not
696 static bool pci_need_device_pre_reloc(struct udevice *bus, uint vendor,
703 !dev_read_u32_index(bus, "u-boot,pci-pre-reloc", index,
706 if (vendev == PCI_VENDEV(vendor, device))
714 * pci_find_and_bind_driver() - Find and bind the right PCI driver
716 * This only looks at certain fields in the descriptor.
718 * @parent: Parent bus
719 * @find_id: Specification of the driver to find
720 * @bdf: Bus/device/function addreess - see PCI_BDF()
721 * @devp: Returns a pointer to the device created
722 * @return 0 if OK, -EPERM if the device is not needed before relocation and
723 * therefore was not created, other -ve value on error
725 static int pci_find_and_bind_driver(struct udevice *parent,
726 struct pci_device_id *find_id,
727 pci_dev_t bdf, struct udevice **devp)
729 struct pci_driver_entry *start, *entry;
730 ofnode node = ofnode_null();
739 debug("%s: Searching for driver: vendor=%x, device=%x\n", __func__,
740 find_id->vendor, find_id->device);
742 /* Determine optional OF node */
743 if (ofnode_valid(dev_ofnode(parent)))
744 pci_dev_find_ofnode(parent, bdf, &node);
746 if (ofnode_valid(node) && !ofnode_is_available(node)) {
747 debug("%s: Ignoring disabled device\n", __func__);
748 return log_msg_ret("dis", -EPERM);
751 start = ll_entry_start(struct pci_driver_entry, pci_driver_entry);
752 n_ents = ll_entry_count(struct pci_driver_entry, pci_driver_entry);
753 for (entry = start; entry != start + n_ents; entry++) {
754 const struct pci_device_id *id;
756 const struct driver *drv;
758 for (id = entry->match;
759 id->vendor || id->subvendor || id->class_mask;
761 if (!pci_match_one_id(id, find_id))
767 * In the pre-relocation phase, we only bind devices
768 * whose driver has the DM_FLAG_PRE_RELOC set, to save
769 * precious memory space as on some platforms as that
770 * space is pretty limited (ie: using Cache As RAM).
772 if (!(gd->flags & GD_FLG_RELOC) &&
773 !(drv->flags & DM_FLAG_PRE_RELOC))
774 return log_msg_ret("pre", -EPERM);
777 * We could pass the descriptor to the driver as
778 * plat (instead of NULL) and allow its bind()
779 * method to return -ENOENT if it doesn't support this
780 * device. That way we could continue the search to
781 * find another driver. For now this doesn't seem
782 * necesssary, so just bind the first match.
784 ret = device_bind(parent, drv, drv->name, NULL, node,
788 debug("%s: Match found: %s\n", __func__, drv->name);
789 dev->driver_data = id->driver_data;
795 bridge = (find_id->class >> 8) == PCI_CLASS_BRIDGE_PCI;
797 * In the pre-relocation phase, we only bind bridge devices to save
798 * precious memory space as on some platforms as that space is pretty
799 * limited (ie: using Cache As RAM).
801 if (!(gd->flags & GD_FLG_RELOC) && !bridge &&
802 !pci_need_device_pre_reloc(parent, find_id->vendor,
804 return log_msg_ret("notbr", -EPERM);
806 /* Bind a generic driver so that the device can be used */
807 sprintf(name, "pci_%x:%x.%x", dev_seq(parent), PCI_DEV(bdf),
812 drv = bridge ? "pci_bridge_drv" : "pci_generic_drv";
814 ret = device_bind_driver_to_node(parent, drv, str, node, devp);
816 debug("%s: Failed to bind generic driver: %d\n", __func__, ret);
820 debug("%s: No match found: bound generic driver instead\n", __func__);
825 debug("%s: No match found: error %d\n", __func__, ret);
829 __weak extern void board_pci_fixup_dev(struct udevice *bus, struct udevice *dev)
833 int pci_bind_bus_devices(struct udevice *bus)
835 ulong vendor, device;
843 end = PCI_BDF(dev_seq(bus), PCI_MAX_PCI_DEVICES - 1,
844 PCI_MAX_PCI_FUNCTIONS - 1);
845 for (bdf = PCI_BDF(dev_seq(bus), 0, 0); bdf <= end;
846 bdf += PCI_BDF(0, 0, 1)) {
847 struct pci_child_plat *pplat;
853 if (PCI_FUNC(bdf) && !found_multi)
856 /* Check only the first access, we don't expect problems */
857 ret = pci_bus_read_config(bus, bdf, PCI_VENDOR_ID, &vendor,
859 if (ret || vendor == 0xffff || vendor == 0x0000)
862 pci_bus_read_config(bus, bdf, PCI_HEADER_TYPE,
863 &header_type, PCI_SIZE_8);
866 found_multi = header_type & 0x80;
868 debug("%s: bus %d/%s: found device %x, function %d", __func__,
869 dev_seq(bus), bus->name, PCI_DEV(bdf), PCI_FUNC(bdf));
870 pci_bus_read_config(bus, bdf, PCI_DEVICE_ID, &device,
872 pci_bus_read_config(bus, bdf, PCI_CLASS_REVISION, &class,
876 /* Find this device in the device tree */
877 ret = pci_bus_find_devfn(bus, PCI_MASK_BUS(bdf), &dev);
878 debug(": find ret=%d\n", ret);
880 /* If nothing in the device tree, bind a device */
881 if (ret == -ENODEV) {
882 struct pci_device_id find_id;
885 memset(&find_id, '\0', sizeof(find_id));
886 find_id.vendor = vendor;
887 find_id.device = device;
888 find_id.class = class;
889 if ((header_type & 0x7f) == PCI_HEADER_TYPE_NORMAL) {
890 pci_bus_read_config(bus, bdf,
891 PCI_SUBSYSTEM_VENDOR_ID,
893 find_id.subvendor = val & 0xffff;
894 find_id.subdevice = val >> 16;
896 ret = pci_find_and_bind_driver(bus, &find_id, bdf,
904 /* Update the platform data */
905 pplat = dev_get_parent_plat(dev);
906 pplat->devfn = PCI_MASK_BUS(bdf);
907 pplat->vendor = vendor;
908 pplat->device = device;
909 pplat->class = class;
911 if (IS_ENABLED(CONFIG_PCI_ARID)) {
912 ari_off = dm_pci_find_ext_capability(dev,
918 * Read Next Function number in ARI Cap
921 dm_pci_read_config16(dev, ari_off + 4,
924 * Update next scan on this function number,
925 * subtract 1 in BDF to satisfy loop increment.
927 if (ari_cap & 0xff00) {
928 bdf = PCI_BDF(PCI_BUS(bdf),
936 board_pci_fixup_dev(bus, dev);
942 static void decode_regions(struct pci_controller *hose, ofnode parent_node,
945 int pci_addr_cells, addr_cells, size_cells;
946 int cells_per_record;
953 prop = ofnode_get_property(node, "ranges", &len);
955 debug("%s: Cannot decode regions\n", __func__);
959 pci_addr_cells = ofnode_read_simple_addr_cells(node);
960 addr_cells = ofnode_read_simple_addr_cells(parent_node);
961 size_cells = ofnode_read_simple_size_cells(node);
963 /* PCI addresses are always 3-cells */
965 cells_per_record = pci_addr_cells + addr_cells + size_cells;
966 hose->region_count = 0;
967 debug("%s: len=%d, cells_per_record=%d\n", __func__, len,
970 /* Dynamically allocate the regions array */
971 max_regions = len / cells_per_record + CONFIG_NR_DRAM_BANKS;
972 hose->regions = (struct pci_region *)
973 calloc(1, max_regions * sizeof(struct pci_region));
975 for (i = 0; i < max_regions; i++, len -= cells_per_record) {
976 u64 pci_addr, addr, size;
982 if (len < cells_per_record)
984 flags = fdt32_to_cpu(prop[0]);
985 space_code = (flags >> 24) & 3;
986 pci_addr = fdtdec_get_number(prop + 1, 2);
987 prop += pci_addr_cells;
988 addr = fdtdec_get_number(prop, addr_cells);
990 size = fdtdec_get_number(prop, size_cells);
992 debug("%s: region %d, pci_addr=%llx, addr=%llx, size=%llx, space_code=%d\n",
993 __func__, hose->region_count, pci_addr, addr, size, space_code);
994 if (space_code & 2) {
995 type = flags & (1U << 30) ? PCI_REGION_PREFETCH :
997 } else if (space_code & 1) {
998 type = PCI_REGION_IO;
1003 if (!IS_ENABLED(CONFIG_SYS_PCI_64BIT) &&
1004 type == PCI_REGION_MEM && upper_32_bits(pci_addr)) {
1005 debug(" - beyond the 32-bit boundary, ignoring\n");
1010 if (!IS_ENABLED(CONFIG_PCI_REGION_MULTI_ENTRY)) {
1011 for (i = 0; i < hose->region_count; i++) {
1012 if (hose->regions[i].flags == type)
1018 pos = hose->region_count++;
1019 debug(" - type=%d, pos=%d\n", type, pos);
1020 pci_set_region(hose->regions + pos, pci_addr, addr, size, type);
1023 /* Add a region for our local memory */
1028 for (i = 0; i < CONFIG_NR_DRAM_BANKS; ++i) {
1029 if (bd->bi_dram[i].size) {
1030 phys_addr_t start = bd->bi_dram[i].start;
1032 if (IS_ENABLED(CONFIG_PCI_MAP_SYSTEM_MEMORY))
1033 start = virt_to_phys((void *)(uintptr_t)bd->bi_dram[i].start);
1035 pci_set_region(hose->regions + hose->region_count++,
1036 start, start, bd->bi_dram[i].size,
1037 PCI_REGION_MEM | PCI_REGION_SYS_MEMORY);
1044 static int pci_uclass_pre_probe(struct udevice *bus)
1046 struct pci_controller *hose;
1050 debug("%s, bus=%d/%s, parent=%s\n", __func__, dev_seq(bus), bus->name,
1052 hose = dev_get_uclass_priv(bus);
1055 * Set the sequence number, if device_bind() doesn't. We want control
1056 * of this so that numbers are allocated as devices are probed. That
1057 * ensures that sub-bus numbered is correct (sub-buses must get numbers
1058 * higher than their parents)
1060 if (dev_seq(bus) == -1) {
1061 ret = uclass_get(UCLASS_PCI, &uc);
1064 bus->seq_ = uclass_find_next_free_seq(uc);
1067 /* For bridges, use the top-level PCI controller */
1068 if (!device_is_on_pci_bus(bus)) {
1070 decode_regions(hose, dev_ofnode(bus->parent), dev_ofnode(bus));
1072 struct pci_controller *parent_hose;
1074 parent_hose = dev_get_uclass_priv(bus->parent);
1075 hose->ctlr = parent_hose->bus;
1079 hose->first_busno = dev_seq(bus);
1080 hose->last_busno = dev_seq(bus);
1081 if (dev_has_ofnode(bus)) {
1082 hose->skip_auto_config_until_reloc =
1084 "u-boot,skip-auto-config-until-reloc");
1090 static int pci_uclass_post_probe(struct udevice *bus)
1092 struct pci_controller *hose = dev_get_uclass_priv(bus);
1095 debug("%s: probing bus %d\n", __func__, dev_seq(bus));
1096 ret = pci_bind_bus_devices(bus);
1098 return log_msg_ret("bind", ret);
1100 if (CONFIG_IS_ENABLED(PCI_PNP) && ll_boot_init() &&
1101 (!hose->skip_auto_config_until_reloc ||
1102 (gd->flags & GD_FLG_RELOC))) {
1103 ret = pci_auto_config_devices(bus);
1105 return log_msg_ret("cfg", ret);
1108 #if defined(CONFIG_X86) && defined(CONFIG_HAVE_FSP)
1110 * Per Intel FSP specification, we should call FSP notify API to
1111 * inform FSP that PCI enumeration has been done so that FSP will
1112 * do any necessary initialization as required by the chipset's
1113 * BIOS Writer's Guide (BWG).
1115 * Unfortunately we have to put this call here as with driver model,
1116 * the enumeration is all done on a lazy basis as needed, so until
1117 * something is touched on PCI it won't happen.
1119 * Note we only call this 1) after U-Boot is relocated, and 2)
1120 * root bus has finished probing.
1122 if ((gd->flags & GD_FLG_RELOC) && dev_seq(bus) == 0 && ll_boot_init()) {
1123 ret = fsp_init_phase_pci();
1125 return log_msg_ret("fsp", ret);
1132 static int pci_uclass_child_post_bind(struct udevice *dev)
1134 struct pci_child_plat *pplat;
1136 if (!dev_has_ofnode(dev))
1139 pplat = dev_get_parent_plat(dev);
1141 /* Extract vendor id and device id if available */
1142 ofnode_read_pci_vendev(dev_ofnode(dev), &pplat->vendor, &pplat->device);
1144 /* Extract the devfn from fdt_pci_addr */
1145 pplat->devfn = pci_get_devfn(dev);
1150 static int pci_bridge_read_config(const struct udevice *bus, pci_dev_t bdf,
1151 uint offset, ulong *valuep,
1152 enum pci_size_t size)
1154 struct pci_controller *hose = dev_get_uclass_priv(bus);
1156 return pci_bus_read_config(hose->ctlr, bdf, offset, valuep, size);
1159 static int pci_bridge_write_config(struct udevice *bus, pci_dev_t bdf,
1160 uint offset, ulong value,
1161 enum pci_size_t size)
1163 struct pci_controller *hose = dev_get_uclass_priv(bus);
1165 return pci_bus_write_config(hose->ctlr, bdf, offset, value, size);
1168 static int skip_to_next_device(struct udevice *bus, struct udevice **devp)
1170 struct udevice *dev;
1174 * Scan through all the PCI controllers. On x86 there will only be one
1175 * but that is not necessarily true on other hardware.
1178 device_find_first_child(bus, &dev);
1183 ret = uclass_next_device(&bus);
1191 int pci_find_next_device(struct udevice **devp)
1193 struct udevice *child = *devp;
1194 struct udevice *bus = child->parent;
1197 /* First try all the siblings */
1200 device_find_next_child(&child);
1207 /* We ran out of siblings. Try the next bus */
1208 ret = uclass_next_device(&bus);
1212 return bus ? skip_to_next_device(bus, devp) : 0;
1215 int pci_find_first_device(struct udevice **devp)
1217 struct udevice *bus;
1221 ret = uclass_first_device(UCLASS_PCI, &bus);
1225 return skip_to_next_device(bus, devp);
1228 ulong pci_conv_32_to_size(ulong value, uint offset, enum pci_size_t size)
1232 return (value >> ((offset & 3) * 8)) & 0xff;
1234 return (value >> ((offset & 2) * 8)) & 0xffff;
1240 ulong pci_conv_size_to_32(ulong old, ulong value, uint offset,
1241 enum pci_size_t size)
1244 uint val_mask, shift;
1259 shift = (offset & off_mask) * 8;
1260 ldata = (value & val_mask) << shift;
1261 mask = val_mask << shift;
1262 value = (old & ~mask) | ldata;
1267 int pci_get_dma_regions(struct udevice *dev, struct pci_region *memp, int index)
1269 int pci_addr_cells, addr_cells, size_cells;
1270 int cells_per_record;
1275 prop = ofnode_get_property(dev_ofnode(dev), "dma-ranges", &len);
1277 log_err("PCI: Device '%s': Cannot decode dma-ranges\n",
1282 pci_addr_cells = ofnode_read_simple_addr_cells(dev_ofnode(dev));
1283 addr_cells = ofnode_read_simple_addr_cells(dev_ofnode(dev->parent));
1284 size_cells = ofnode_read_simple_size_cells(dev_ofnode(dev));
1286 /* PCI addresses are always 3-cells */
1288 cells_per_record = pci_addr_cells + addr_cells + size_cells;
1289 debug("%s: len=%d, cells_per_record=%d\n", __func__, len,
1293 memp->bus_start = fdtdec_get_number(prop + 1, 2);
1294 prop += pci_addr_cells;
1295 memp->phys_start = fdtdec_get_number(prop, addr_cells);
1297 memp->size = fdtdec_get_number(prop, size_cells);
1303 len -= cells_per_record;
1309 int pci_get_regions(struct udevice *dev, struct pci_region **iop,
1310 struct pci_region **memp, struct pci_region **prefp)
1312 struct udevice *bus = pci_get_controller(dev);
1313 struct pci_controller *hose = dev_get_uclass_priv(bus);
1319 for (i = 0; i < hose->region_count; i++) {
1320 switch (hose->regions[i].flags) {
1322 if (!*iop || (*iop)->size < hose->regions[i].size)
1323 *iop = hose->regions + i;
1325 case PCI_REGION_MEM:
1326 if (!*memp || (*memp)->size < hose->regions[i].size)
1327 *memp = hose->regions + i;
1329 case (PCI_REGION_MEM | PCI_REGION_PREFETCH):
1330 if (!*prefp || (*prefp)->size < hose->regions[i].size)
1331 *prefp = hose->regions + i;
1336 return (*iop != NULL) + (*memp != NULL) + (*prefp != NULL);
1339 u32 dm_pci_read_bar32(const struct udevice *dev, int barnum)
1344 bar = PCI_BASE_ADDRESS_0 + barnum * 4;
1345 dm_pci_read_config32(dev, bar, &addr);
1348 * If we get an invalid address, return this so that comparisons with
1349 * FDT_ADDR_T_NONE work correctly
1351 if (addr == 0xffffffff)
1353 else if (addr & PCI_BASE_ADDRESS_SPACE_IO)
1354 return addr & PCI_BASE_ADDRESS_IO_MASK;
1356 return addr & PCI_BASE_ADDRESS_MEM_MASK;
1359 void dm_pci_write_bar32(struct udevice *dev, int barnum, u32 addr)
1363 bar = PCI_BASE_ADDRESS_0 + barnum * 4;
1364 dm_pci_write_config32(dev, bar, addr);
1367 static int _dm_pci_bus_to_phys(struct udevice *ctlr,
1368 pci_addr_t bus_addr, unsigned long flags,
1369 unsigned long skip_mask, phys_addr_t *pa)
1371 struct pci_controller *hose = dev_get_uclass_priv(ctlr);
1372 struct pci_region *res;
1375 if (hose->region_count == 0) {
1380 for (i = 0; i < hose->region_count; i++) {
1381 res = &hose->regions[i];
1383 if (((res->flags ^ flags) & PCI_REGION_TYPE) != 0)
1386 if (res->flags & skip_mask)
1389 if (bus_addr >= res->bus_start &&
1390 (bus_addr - res->bus_start) < res->size) {
1391 *pa = (bus_addr - res->bus_start + res->phys_start);
1399 phys_addr_t dm_pci_bus_to_phys(struct udevice *dev, pci_addr_t bus_addr,
1400 unsigned long flags)
1402 phys_addr_t phys_addr = 0;
1403 struct udevice *ctlr;
1406 /* The root controller has the region information */
1407 ctlr = pci_get_controller(dev);
1410 * if PCI_REGION_MEM is set we do a two pass search with preference
1411 * on matches that don't have PCI_REGION_SYS_MEMORY set
1413 if ((flags & PCI_REGION_TYPE) == PCI_REGION_MEM) {
1414 ret = _dm_pci_bus_to_phys(ctlr, bus_addr,
1415 flags, PCI_REGION_SYS_MEMORY,
1421 ret = _dm_pci_bus_to_phys(ctlr, bus_addr, flags, 0, &phys_addr);
1424 puts("pci_hose_bus_to_phys: invalid physical address\n");
1429 int _dm_pci_phys_to_bus(struct udevice *dev, phys_addr_t phys_addr,
1430 unsigned long flags, unsigned long skip_mask,
1433 struct pci_region *res;
1434 struct udevice *ctlr;
1435 pci_addr_t bus_addr;
1437 struct pci_controller *hose;
1439 /* The root controller has the region information */
1440 ctlr = pci_get_controller(dev);
1441 hose = dev_get_uclass_priv(ctlr);
1443 if (hose->region_count == 0) {
1448 for (i = 0; i < hose->region_count; i++) {
1449 res = &hose->regions[i];
1451 if (((res->flags ^ flags) & PCI_REGION_TYPE) != 0)
1454 if (res->flags & skip_mask)
1457 bus_addr = phys_addr - res->phys_start + res->bus_start;
1459 if (bus_addr >= res->bus_start &&
1460 (bus_addr - res->bus_start) < res->size) {
1469 pci_addr_t dm_pci_phys_to_bus(struct udevice *dev, phys_addr_t phys_addr,
1470 unsigned long flags)
1472 pci_addr_t bus_addr = 0;
1476 * if PCI_REGION_MEM is set we do a two pass search with preference
1477 * on matches that don't have PCI_REGION_SYS_MEMORY set
1479 if ((flags & PCI_REGION_TYPE) == PCI_REGION_MEM) {
1480 ret = _dm_pci_phys_to_bus(dev, phys_addr, flags,
1481 PCI_REGION_SYS_MEMORY, &bus_addr);
1486 ret = _dm_pci_phys_to_bus(dev, phys_addr, flags, 0, &bus_addr);
1489 puts("pci_hose_phys_to_bus: invalid physical address\n");
1494 static phys_addr_t dm_pci_map_ea_virt(struct udevice *dev, int ea_off,
1495 struct pci_child_plat *pdata)
1497 phys_addr_t addr = 0;
1500 * In the case of a Virtual Function device using BAR
1501 * base and size, add offset for VFn BAR(1, 2, 3...n)
1503 if (pdata->is_virtfn) {
1507 /* MaxOffset, 1st DW */
1508 dm_pci_read_config32(dev, ea_off + 8, &ea_entry);
1509 sz = ea_entry & PCI_EA_FIELD_MASK;
1510 /* Fill up lower 2 bits */
1511 sz |= (~PCI_EA_FIELD_MASK);
1513 if (ea_entry & PCI_EA_IS_64) {
1514 /* MaxOffset 2nd DW */
1515 dm_pci_read_config32(dev, ea_off + 16, &ea_entry);
1516 sz |= ((u64)ea_entry) << 32;
1519 addr = (pdata->virtid - 1) * (sz + 1);
1525 static void *dm_pci_map_ea_bar(struct udevice *dev, int bar, int flags,
1526 int ea_off, struct pci_child_plat *pdata)
1528 int ea_cnt, i, entry_size;
1529 int bar_id = (bar - PCI_BASE_ADDRESS_0) >> 2;
1533 if (IS_ENABLED(CONFIG_PCI_SRIOV)) {
1535 * In the case of a Virtual Function device, device is
1536 * Physical function, so pdata will point to required VF
1539 if (pdata->is_virtfn)
1540 bar_id += PCI_EA_BEI_VF_BAR0;
1543 /* EA capability structure header */
1544 dm_pci_read_config32(dev, ea_off, &ea_entry);
1545 ea_cnt = (ea_entry >> 16) & PCI_EA_NUM_ENT_MASK;
1546 ea_off += PCI_EA_FIRST_ENT;
1548 for (i = 0; i < ea_cnt; i++, ea_off += entry_size) {
1550 dm_pci_read_config32(dev, ea_off, &ea_entry);
1551 entry_size = ((ea_entry & PCI_EA_ES) + 1) << 2;
1553 if (((ea_entry & PCI_EA_BEI) >> 4) != bar_id)
1556 /* Base address, 1st DW */
1557 dm_pci_read_config32(dev, ea_off + 4, &ea_entry);
1558 addr = ea_entry & PCI_EA_FIELD_MASK;
1559 if (ea_entry & PCI_EA_IS_64) {
1560 /* Base address, 2nd DW, skip over 4B MaxOffset */
1561 dm_pci_read_config32(dev, ea_off + 12, &ea_entry);
1562 addr |= ((u64)ea_entry) << 32;
1565 if (IS_ENABLED(CONFIG_PCI_SRIOV))
1566 addr += dm_pci_map_ea_virt(dev, ea_off, pdata);
1568 /* size ignored for now */
1569 return map_physmem(addr, 0, flags);
1575 void *dm_pci_map_bar(struct udevice *dev, int bar, int flags)
1577 struct pci_child_plat *pdata = dev_get_parent_plat(dev);
1578 struct udevice *udev = dev;
1579 pci_addr_t pci_bus_addr;
1583 if (IS_ENABLED(CONFIG_PCI_SRIOV)) {
1585 * In case of Virtual Function devices, use PF udevice
1586 * as EA capability is defined in Physical Function
1588 if (pdata->is_virtfn)
1589 udev = pdata->pfdev;
1593 * if the function supports Enhanced Allocation use that instead of
1595 * Incase of virtual functions, pdata will help read VF BEI
1596 * and EA entry size.
1598 ea_off = dm_pci_find_capability(udev, PCI_CAP_ID_EA);
1600 return dm_pci_map_ea_bar(udev, bar, flags, ea_off, pdata);
1602 /* read BAR address */
1603 dm_pci_read_config32(udev, bar, &bar_response);
1604 pci_bus_addr = (pci_addr_t)(bar_response & ~0xf);
1607 * Pass "0" as the length argument to pci_bus_to_virt. The arg
1608 * isn't actually used on any platform because U-Boot assumes a static
1609 * linear mapping. In the future, this could read the BAR size
1610 * and pass that as the size if needed.
1612 return dm_pci_bus_to_virt(udev, pci_bus_addr, flags, 0, MAP_NOCACHE);
1615 static int _dm_pci_find_next_capability(struct udevice *dev, u8 pos, int cap)
1617 int ttl = PCI_FIND_CAP_TTL;
1621 dm_pci_read_config8(dev, pos, &pos);
1624 if (pos < PCI_STD_HEADER_SIZEOF)
1627 dm_pci_read_config16(dev, pos, &ent);
1640 int dm_pci_find_next_capability(struct udevice *dev, u8 start, int cap)
1642 return _dm_pci_find_next_capability(dev, start + PCI_CAP_LIST_NEXT,
1646 int dm_pci_find_capability(struct udevice *dev, int cap)
1652 dm_pci_read_config16(dev, PCI_STATUS, &status);
1653 if (!(status & PCI_STATUS_CAP_LIST))
1656 dm_pci_read_config8(dev, PCI_HEADER_TYPE, &header_type);
1657 if ((header_type & 0x7f) == PCI_HEADER_TYPE_CARDBUS)
1658 pos = PCI_CB_CAPABILITY_LIST;
1660 pos = PCI_CAPABILITY_LIST;
1662 return _dm_pci_find_next_capability(dev, pos, cap);
1665 int dm_pci_find_next_ext_capability(struct udevice *dev, int start, int cap)
1669 int pos = PCI_CFG_SPACE_SIZE;
1671 /* minimum 8 bytes per capability */
1672 ttl = (PCI_CFG_SPACE_EXP_SIZE - PCI_CFG_SPACE_SIZE) / 8;
1677 dm_pci_read_config32(dev, pos, &header);
1679 * If we have no capabilities, this is indicated by cap ID,
1680 * cap version and next pointer all being 0.
1686 if (PCI_EXT_CAP_ID(header) == cap)
1689 pos = PCI_EXT_CAP_NEXT(header);
1690 if (pos < PCI_CFG_SPACE_SIZE)
1693 dm_pci_read_config32(dev, pos, &header);
1699 int dm_pci_find_ext_capability(struct udevice *dev, int cap)
1701 return dm_pci_find_next_ext_capability(dev, 0, cap);
1704 int dm_pci_flr(struct udevice *dev)
1709 /* look for PCI Express Capability */
1710 pcie_off = dm_pci_find_capability(dev, PCI_CAP_ID_EXP);
1714 /* check FLR capability */
1715 dm_pci_read_config32(dev, pcie_off + PCI_EXP_DEVCAP, &cap);
1716 if (!(cap & PCI_EXP_DEVCAP_FLR))
1719 dm_pci_clrset_config16(dev, pcie_off + PCI_EXP_DEVCTL, 0,
1720 PCI_EXP_DEVCTL_BCR_FLR);
1722 /* wait 100ms, per PCI spec */
1728 #if defined(CONFIG_PCI_SRIOV)
1729 int pci_sriov_init(struct udevice *pdev, int vf_en)
1732 struct udevice *bus;
1733 struct udevice *dev;
1743 pos = dm_pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_SRIOV);
1745 debug("Error: SRIOV capability not found\n");
1749 dm_pci_read_config16(pdev, pos + PCI_SRIOV_CTRL, &ctrl);
1751 dm_pci_read_config16(pdev, pos + PCI_SRIOV_TOTAL_VF, &total_vf);
1752 if (vf_en > total_vf)
1754 dm_pci_write_config16(pdev, pos + PCI_SRIOV_NUM_VF, vf_en);
1756 ctrl |= PCI_SRIOV_CTRL_VFE | PCI_SRIOV_CTRL_MSE;
1757 dm_pci_write_config16(pdev, pos + PCI_SRIOV_CTRL, ctrl);
1759 dm_pci_read_config16(pdev, pos + PCI_SRIOV_NUM_VF, &num_vfs);
1760 if (num_vfs > vf_en)
1763 dm_pci_read_config16(pdev, pos + PCI_SRIOV_VF_OFFSET, &vf_offset);
1764 dm_pci_read_config16(pdev, pos + PCI_SRIOV_VF_STRIDE, &vf_stride);
1766 dm_pci_read_config16(pdev, PCI_VENDOR_ID, &vendor);
1767 dm_pci_read_config16(pdev, pos + PCI_SRIOV_VF_DID, &device);
1769 bdf = dm_pci_get_bdf(pdev);
1771 pci_get_bus(PCI_BUS(bdf), &bus);
1776 bdf += PCI_BDF(0, 0, vf_offset);
1778 for (vf = 0; vf < num_vfs; vf++) {
1779 struct pci_child_plat *pplat;
1782 pci_bus_read_config(bus, bdf, PCI_CLASS_DEVICE,
1783 &class, PCI_SIZE_16);
1785 debug("%s: bus %d/%s: found VF %x:%x\n", __func__,
1786 dev_seq(bus), bus->name, PCI_DEV(bdf), PCI_FUNC(bdf));
1788 /* Find this device in the device tree */
1789 ret = pci_bus_find_devfn(bus, PCI_MASK_BUS(bdf), &dev);
1791 if (ret == -ENODEV) {
1792 struct pci_device_id find_id;
1794 memset(&find_id, '\0', sizeof(find_id));
1795 find_id.vendor = vendor;
1796 find_id.device = device;
1797 find_id.class = class;
1799 ret = pci_find_and_bind_driver(bus, &find_id,
1806 /* Update the platform data */
1807 pplat = dev_get_parent_plat(dev);
1808 pplat->devfn = PCI_MASK_BUS(bdf);
1809 pplat->vendor = vendor;
1810 pplat->device = device;
1811 pplat->class = class;
1812 pplat->is_virtfn = true;
1813 pplat->pfdev = pdev;
1814 pplat->virtid = vf * vf_stride + vf_offset;
1816 debug("%s: bus %d/%s: found VF %x:%x %x:%x class %lx id %x\n",
1817 __func__, dev_seq(dev), dev->name, PCI_DEV(bdf),
1818 PCI_FUNC(bdf), vendor, device, class, pplat->virtid);
1819 bdf += PCI_BDF(0, 0, vf_stride);
1825 int pci_sriov_get_totalvfs(struct udevice *pdev)
1830 pos = dm_pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_SRIOV);
1832 debug("Error: SRIOV capability not found\n");
1836 dm_pci_read_config16(pdev, pos + PCI_SRIOV_TOTAL_VF, &total_vf);
1842 UCLASS_DRIVER(pci) = {
1845 .flags = DM_UC_FLAG_SEQ_ALIAS | DM_UC_FLAG_NO_AUTO_SEQ,
1846 .post_bind = dm_scan_fdt_dev,
1847 .pre_probe = pci_uclass_pre_probe,
1848 .post_probe = pci_uclass_post_probe,
1849 .child_post_bind = pci_uclass_child_post_bind,
1850 .per_device_auto = sizeof(struct pci_controller),
1851 .per_child_plat_auto = sizeof(struct pci_child_plat),
1854 static const struct dm_pci_ops pci_bridge_ops = {
1855 .read_config = pci_bridge_read_config,
1856 .write_config = pci_bridge_write_config,
1859 static const struct udevice_id pci_bridge_ids[] = {
1860 { .compatible = "pci-bridge" },
1864 U_BOOT_DRIVER(pci_bridge_drv) = {
1865 .name = "pci_bridge_drv",
1867 .of_match = pci_bridge_ids,
1868 .ops = &pci_bridge_ops,
1871 UCLASS_DRIVER(pci_generic) = {
1872 .id = UCLASS_PCI_GENERIC,
1873 .name = "pci_generic",
1876 static const struct udevice_id pci_generic_ids[] = {
1877 { .compatible = "pci-generic" },
1881 U_BOOT_DRIVER(pci_generic_drv) = {
1882 .name = "pci_generic_drv",
1883 .id = UCLASS_PCI_GENERIC,
1884 .of_match = pci_generic_ids,
1889 struct udevice *bus;
1892 * Enumerate all known controller devices. Enumeration has the side-
1893 * effect of probing them, so PCIe devices will be enumerated too.
1895 for (uclass_first_device_check(UCLASS_PCI, &bus);
1897 uclass_next_device_check(&bus)) {