2 * SPDX-License-Identifier: BSD-2-Clause
4 * Copyright (c) 1997, Stefan Esser <se@freebsd.org>
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice unmodified, this list of conditions, and the following
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 #include <sys/cdefs.h>
32 #include <sys/param.h>
33 #include <sys/systm.h>
35 #include <sys/kernel.h>
36 #include <sys/malloc.h>
37 #include <sys/module.h>
39 #include <sys/sysctl.h>
41 #include <dev/pci/pcivar.h>
42 #include <dev/pci/pcireg.h>
43 #include <dev/pci/pcib_private.h>
44 #include <isa/isavar.h>
46 #include <machine/md_var.h>
48 #include <x86/legacyvar.h>
49 #include <machine/pci_cfgreg.h>
50 #include <machine/resource.h>
55 legacy_pcib_maxslots(device_t dev)
60 /* read configuration space register */
63 legacy_pcib_read_config(device_t dev, u_int bus, u_int slot, u_int func,
66 return(pci_cfgregread(bus, slot, func, reg, bytes));
69 /* write configuration space register */
72 legacy_pcib_write_config(device_t dev, u_int bus, u_int slot, u_int func,
73 u_int reg, uint32_t data, int bytes)
75 pci_cfgregwrite(bus, slot, func, reg, data, bytes);
81 legacy_pcib_route_interrupt(device_t pcib, device_t dev, int pin)
85 return (pci_pir_route_interrupt(pci_get_bus(dev), pci_get_slot(dev),
86 pci_get_function(dev), pin));
88 /* No routing possible */
89 return (PCI_INVALID_IRQ);
93 /* Pass MSI requests up to the nexus. */
96 legacy_pcib_alloc_msi(device_t pcib, device_t dev, int count, int maxcount,
101 bus = device_get_parent(pcib);
102 return (PCIB_ALLOC_MSI(device_get_parent(bus), dev, count, maxcount,
107 legacy_pcib_alloc_msix(device_t pcib, device_t dev, int *irq)
111 bus = device_get_parent(pcib);
112 return (PCIB_ALLOC_MSIX(device_get_parent(bus), dev, irq));
116 legacy_pcib_map_msi(device_t pcib, device_t dev, int irq, uint64_t *addr,
120 int error, func, slot;
122 bus = device_get_parent(pcib);
123 error = PCIB_MAP_MSI(device_get_parent(bus), dev, irq, addr, data);
127 slot = legacy_get_pcislot(pcib);
128 func = legacy_get_pcifunc(pcib);
129 if (slot == -1 || func == -1)
131 hostb = pci_find_bsf(0, slot, func);
132 KASSERT(hostb != NULL, ("%s: missing hostb for 0:%d:%d", __func__,
134 pci_ht_map_msi(hostb, *addr);
139 legacy_pcib_is_host_bridge(int bus, int slot, int func,
140 uint32_t id, uint8_t class, uint8_t subclass,
144 const char *s = NULL;
145 static uint8_t pxb[4]; /* hack for 450nx */
151 s = "Intel 824?? host to PCI bridge";
152 /* XXX This is a guess */
153 /* *busnum = legacy_pcib_read_config(0, bus, slot, func, 0x41, 1); */
157 s = "Intel 82810 (i810 GMCH) Host To Hub bridge";
160 s = "Intel 82810-DC100 (i810-DC100 GMCH) Host To Hub bridge";
163 s = "Intel 82810E (i810E GMCH) Host To Hub bridge";
166 s = "Intel 82815 (i815 GMCH) Host To Hub bridge";
169 s = "Intel 82443LX (440 LX) host to PCI bridge";
172 s = "Intel 82443BX (440 BX) host to PCI bridge";
175 s = "Intel 82443BX host to PCI bridge (AGP disabled)";
178 s = "Intel 82443MX host to PCI bridge";
181 s = "Intel 82443GX host to PCI bridge";
184 s = "Intel 82443GX host to AGP bridge";
187 s = "Intel 82443GX host to PCI bridge (AGP disabled)";
190 s = "Intel 82454KX/GX (Orion) host to PCI bridge";
191 *busnum = legacy_pcib_read_config(0, bus, slot, func, 0x4a, 1);
195 * For the 450nx chipset, there is a whole bundle of
196 * things pretending to be host bridges. The MIOC will
197 * be seen first and isn't really a pci bridge (the
198 * actual buses are attached to the PXB's). We need to
199 * read the registers of the MIOC to figure out the
200 * bus numbers for the PXB channels.
202 * Since the MIOC doesn't have a pci bus attached, we
203 * pretend it wasn't there.
205 pxb[0] = legacy_pcib_read_config(0, bus, slot, func,
206 0xd0, 1); /* BUSNO[0] */
207 pxb[1] = legacy_pcib_read_config(0, bus, slot, func,
208 0xd1, 1) + 1; /* SUBA[0]+1 */
209 pxb[2] = legacy_pcib_read_config(0, bus, slot, func,
210 0xd3, 1); /* BUSNO[1] */
211 pxb[3] = legacy_pcib_read_config(0, bus, slot, func,
212 0xd4, 1) + 1; /* SUBA[1]+1 */
217 s = "Intel 82454NX PXB#0, Bus#A";
221 s = "Intel 82454NX PXB#0, Bus#B";
225 s = "Intel 82454NX PXB#1, Bus#A";
229 s = "Intel 82454NX PXB#1, Bus#B";
235 s = "Intel 82845 Host to PCI bridge";
238 /* AMD -- vendor 0x1022 */
240 s = "AMD Elan SC520 host to PCI bridge";
242 init_AMD_Elan_sc520();
245 "*** WARNING: missing CPU_ELAN -- timekeeping may be wrong\n");
249 s = "AMD-751 host to PCI bridge";
252 s = "AMD-761 host to PCI bridge";
255 /* SiS -- vendor 0x1039 */
266 s = "SiS 5591 host to PCI bridge";
269 s = "SiS 5591 host to AGP bridge";
272 /* VLSI -- vendor 0x1004 */
274 s = "VLSI 82C592 Host to PCI bridge";
277 /* XXX Here is MVP3, I got the datasheet but NO M/B to test it */
278 /* totally. Please let me know if anything wrong. -F */
279 /* XXX need info on the MVP3 -- any takers? */
281 s = "VIA 82C598MVP (Apollo MVP3) host bridge";
284 /* AcerLabs -- vendor 0x10b9 */
285 /* Funny : The datasheet told me vendor id is "10b8",sub-vendor */
286 /* id is '10b9" but the register always shows "10b9". -Foxfair */
288 s = "AcerLabs M1541 (Aladdin-V) PCI host bridge";
291 /* OPTi -- vendor 0x1045 */
293 s = "OPTi 82C700 host to PCI bridge";
296 s = "OPTi 82C822 host to PCI Bridge";
299 /* ServerWorks -- vendor 0x1166 */
301 s = "ServerWorks NB6536 2.0HE host to PCI bridge";
302 *busnum = legacy_pcib_read_config(0, bus, slot, func, 0x44, 1);
311 case 0x010f1014: /* IBM re-badged ServerWorks chipset */
312 s = "ServerWorks host to PCI bridge";
313 *busnum = legacy_pcib_read_config(0, bus, slot, func, 0x44, 1);
317 s = "ServerWorks NB6635 3.0LE host to PCI bridge";
318 *busnum = legacy_pcib_read_config(0, bus, slot, func, 0x44, 1);
322 s = "ServerWorks CIOB30 host to PCI bridge";
323 *busnum = legacy_pcib_read_config(0, bus, slot, func, 0x44, 1);
328 case 0x03021014: /* IBM re-badged ServerWorks chipset */
329 s = "ServerWorks CMIC-HE host to PCI-X bridge";
330 *busnum = legacy_pcib_read_config(0, bus, slot, func, 0x44, 1);
333 /* XXX unknown chipset, but working */
339 s = "ServerWorks host to PCI bridge(unknown chipset)";
340 *busnum = legacy_pcib_read_config(0, bus, slot, func, 0x44, 1);
343 /* Compaq/HP -- vendor 0x0e11 */
345 s = "Compaq/HP Model 6010 HotPlug PCI Bridge";
346 *busnum = legacy_pcib_read_config(0, bus, slot, func, 0xc8, 1);
349 /* Integrated Micro Solutions -- vendor 0x10e0 */
351 s = "Integrated Micro Solutions VL Bridge";
355 if (class == PCIC_BRIDGE && subclass == PCIS_BRIDGE_HOST)
356 s = "Host to PCI bridge";
362 const char *s = NULL;
365 if (class == PCIC_BRIDGE && subclass == PCIS_BRIDGE_HOST)
366 s = "Host to PCI bridge";
372 * Scan the first pci bus for host-pci bridges and add pcib instances
373 * to the nexus for each bridge.
376 legacy_pcib_identify(driver_t *driver, device_t parent)
385 devclass_t pci_devclass;
387 if (pci_cfgregopen() == 0)
390 * Check to see if we haven't already had a PCI bus added
391 * via some other means. If we have, bail since otherwise
392 * we're going to end up duplicating it.
394 if ((pci_devclass = devclass_find("pci")) &&
395 devclass_get_device(pci_devclass, 0))
400 for (slot = 0; slot <= PCI_SLOTMAX; slot++) {
402 hdrtype = legacy_pcib_read_config(0, bus, slot, func,
405 * When enumerating bus devices, the standard says that
406 * one should check the header type and ignore the slots whose
407 * header types that the software doesn't know about. We use
408 * this to filter out devices.
410 if ((hdrtype & PCIM_HDRTYPE) > PCI_MAXHDRTYPE)
412 if ((hdrtype & PCIM_MFDEV) &&
413 (!found_orion || hdrtype != 0xff))
414 pcifunchigh = PCI_FUNCMAX;
417 for (func = 0; func <= pcifunchigh; func++) {
419 * Read the IDs and class from the device.
422 uint8_t class, subclass, busnum;
427 id = legacy_pcib_read_config(0, bus, slot, func,
431 class = legacy_pcib_read_config(0, bus, slot, func,
433 subclass = legacy_pcib_read_config(0, bus, slot, func,
436 s = legacy_pcib_is_host_bridge(bus, slot, func,
443 * Check to see if the physical bus has already
444 * been seen. Eg: hybrid 32 and 64 bit host
445 * bridges to the same logical bus.
447 if (device_get_children(parent, &devs, &ndevs) == 0) {
448 for (i = 0; s != NULL && i < ndevs; i++) {
449 if (strcmp(device_get_name(devs[i]),
452 if (legacy_get_pcibus(devs[i]) == busnum)
461 * Add at priority 100 to make sure we
462 * go after any motherboard resources
464 child = BUS_ADD_CHILD(parent, 100,
466 device_set_desc(child, s);
467 legacy_set_pcibus(child, busnum);
468 legacy_set_pcislot(child, slot);
469 legacy_set_pcifunc(child, func);
472 if (id == 0x12258086)
474 if (id == 0x84c48086)
478 if (found824xx && bus == 0) {
484 * Make sure we add at least one bridge since some old
485 * hardware doesn't actually have a host-pci bridge device.
486 * Note that pci_cfgregopen() thinks we have PCI devices..
489 #ifndef NO_LEGACY_PCIB
492 "legacy_pcib_identify: no bridge found, adding pcib0 anyway\n");
493 child = BUS_ADD_CHILD(parent, 100, "pcib", 0);
494 legacy_set_pcibus(child, 0);
500 legacy_pcib_probe(device_t dev)
503 if (pci_cfgregopen() == 0)
509 legacy_pcib_attach(device_t dev)
515 bus = pcib_get_bus(dev);
517 * Look for a PCI BIOS interrupt routing table as that will be
518 * our method of routing interrupts if we have one.
520 if (pci_pir_probe(bus, 0)) {
521 pir = BUS_ADD_CHILD(device_get_parent(dev), 0, "pir", 0);
523 device_probe_and_attach(pir);
526 device_add_child(dev, "pci", -1);
527 return bus_generic_attach(dev);
531 legacy_pcib_read_ivar(device_t dev, device_t child, int which,
536 case PCIB_IVAR_DOMAIN:
540 *result = legacy_get_pcibus(dev);
547 legacy_pcib_write_ivar(device_t dev, device_t child, int which,
552 case PCIB_IVAR_DOMAIN:
555 legacy_set_pcibus(dev, value);
562 * Helper routine for x86 Host-PCI bridge driver resource allocation.
563 * This is used to adjust the start address of wildcard allocation
564 * requests to avoid low addresses that are known to be problematic.
566 * If no memory preference is given, use upper 32MB slot most BIOSes
567 * use for their memory window. This is typically only used on older
568 * laptops that don't have PCI buses behind a PCI bridge, so assuming
569 * > 32MB is likely OK.
571 * However, this can cause problems for other chipsets, so we make
572 * this tunable by hw.pci.host_mem_start.
574 SYSCTL_DECL(_hw_pci);
576 static unsigned long host_mem_start = 0x80000000;
577 SYSCTL_ULONG(_hw_pci, OID_AUTO, host_mem_start, CTLFLAG_RDTUN, &host_mem_start,
578 0, "Limit the host bridge memory to being above this address.");
581 hostb_alloc_start(int type, rman_res_t start, rman_res_t end, rman_res_t count)
584 if (start + count - 1 != end) {
585 if (type == SYS_RES_MEMORY && start < host_mem_start)
586 start = host_mem_start;
587 if (type == SYS_RES_IOPORT && start < 0x1000)
594 legacy_pcib_alloc_resource(device_t dev, device_t child, int type, int *rid,
595 rman_res_t start, rman_res_t end, rman_res_t count, u_int flags)
598 #if defined(NEW_PCIB) && defined(PCI_RES_BUS)
599 if (type == PCI_RES_BUS)
600 return (pci_domain_alloc_bus(0, child, rid, start, end, count,
603 start = hostb_alloc_start(type, start, end, count);
604 return (bus_generic_alloc_resource(dev, child, type, rid, start, end,
608 #if defined(NEW_PCIB) && defined(PCI_RES_BUS)
610 legacy_pcib_adjust_resource(device_t dev, device_t child, int type,
611 struct resource *r, rman_res_t start, rman_res_t end)
614 if (type == PCI_RES_BUS)
615 return (pci_domain_adjust_bus(0, child, r, start, end));
616 return (bus_generic_adjust_resource(dev, child, type, r, start, end));
620 legacy_pcib_release_resource(device_t dev, device_t child, int type, int rid,
624 if (type == PCI_RES_BUS)
625 return (pci_domain_release_bus(0, child, rid, r));
626 return (bus_generic_release_resource(dev, child, type, rid, r));
630 static device_method_t legacy_pcib_methods[] = {
631 /* Device interface */
632 DEVMETHOD(device_identify, legacy_pcib_identify),
633 DEVMETHOD(device_probe, legacy_pcib_probe),
634 DEVMETHOD(device_attach, legacy_pcib_attach),
635 DEVMETHOD(device_shutdown, bus_generic_shutdown),
636 DEVMETHOD(device_suspend, bus_generic_suspend),
637 DEVMETHOD(device_resume, bus_generic_resume),
640 DEVMETHOD(bus_read_ivar, legacy_pcib_read_ivar),
641 DEVMETHOD(bus_write_ivar, legacy_pcib_write_ivar),
642 DEVMETHOD(bus_alloc_resource, legacy_pcib_alloc_resource),
643 #if defined(NEW_PCIB) && defined(PCI_RES_BUS)
644 DEVMETHOD(bus_adjust_resource, legacy_pcib_adjust_resource),
645 DEVMETHOD(bus_release_resource, legacy_pcib_release_resource),
647 DEVMETHOD(bus_adjust_resource, bus_generic_adjust_resource),
648 DEVMETHOD(bus_release_resource, bus_generic_release_resource),
650 DEVMETHOD(bus_activate_resource, bus_generic_activate_resource),
651 DEVMETHOD(bus_deactivate_resource, bus_generic_deactivate_resource),
652 DEVMETHOD(bus_setup_intr, bus_generic_setup_intr),
653 DEVMETHOD(bus_teardown_intr, bus_generic_teardown_intr),
656 DEVMETHOD(pcib_maxslots, legacy_pcib_maxslots),
657 DEVMETHOD(pcib_read_config, legacy_pcib_read_config),
658 DEVMETHOD(pcib_write_config, legacy_pcib_write_config),
659 DEVMETHOD(pcib_route_interrupt, legacy_pcib_route_interrupt),
660 DEVMETHOD(pcib_alloc_msi, legacy_pcib_alloc_msi),
661 DEVMETHOD(pcib_release_msi, pcib_release_msi),
662 DEVMETHOD(pcib_alloc_msix, legacy_pcib_alloc_msix),
663 DEVMETHOD(pcib_release_msix, pcib_release_msix),
664 DEVMETHOD(pcib_map_msi, legacy_pcib_map_msi),
665 DEVMETHOD(pcib_request_feature, pcib_request_feature_allow),
670 DEFINE_CLASS_0(pcib, legacy_pcib_driver, legacy_pcib_methods, 1);
671 DRIVER_MODULE(pcib, legacy, legacy_pcib_driver, 0, 0);
674 * Install placeholder to claim the resources owned by the
675 * PCI bus interface. This could be used to extract the
676 * config space registers in the extreme case where the PnP
677 * ID is available and the PCI BIOS isn't, but for now we just
678 * eat the PnP ID and do nothing else.
680 * we silence this probe, as it will generally confuse people.
682 static struct isa_pnp_id pcibus_pnp_ids[] = {
683 { 0x030ad041 /* PNP0A03 */, "PCI Bus" },
684 { 0x080ad041 /* PNP0A08 */, "PCIe Bus" },
689 pcibus_pnp_probe(device_t dev)
693 if ((result = ISA_PNP_PROBE(device_get_parent(dev), dev, pcibus_pnp_ids)) <= 0)
699 pcibus_pnp_attach(device_t dev)
704 static device_method_t pcibus_pnp_methods[] = {
705 /* Device interface */
706 DEVMETHOD(device_probe, pcibus_pnp_probe),
707 DEVMETHOD(device_attach, pcibus_pnp_attach),
708 DEVMETHOD(device_detach, bus_generic_detach),
709 DEVMETHOD(device_shutdown, bus_generic_shutdown),
710 DEVMETHOD(device_suspend, bus_generic_suspend),
711 DEVMETHOD(device_resume, bus_generic_resume),
715 DEFINE_CLASS_0(pcibus_pnp, pcibus_pnp_driver, pcibus_pnp_methods, 1);
716 DRIVER_MODULE(pcibus_pnp, isa, pcibus_pnp_driver, 0, 0);
720 * Provide a PCI-PCI bridge driver for PCI buses behind PCI-PCI bridges
721 * that appear in the PCIBIOS Interrupt Routing Table to use the routing
722 * table for interrupt routing when possible.
724 static int pcibios_pcib_probe(device_t bus);
726 static device_method_t pcibios_pcib_pci_methods[] = {
727 /* Device interface */
728 DEVMETHOD(device_probe, pcibios_pcib_probe),
731 DEVMETHOD(pcib_route_interrupt, legacy_pcib_route_interrupt),
735 DEFINE_CLASS_1(pcib, pcibios_pcib_driver, pcibios_pcib_pci_methods,
736 sizeof(struct pcib_softc), pcib_driver);
737 DRIVER_MODULE(pcibios_pcib, pci, pcibios_pcib_driver, 0, 0);
738 ISA_PNP_INFO(pcibus_pnp_ids);
741 pcibios_pcib_probe(device_t dev)
745 if ((pci_get_class(dev) != PCIC_BRIDGE) ||
746 (pci_get_subclass(dev) != PCIS_BRIDGE_PCI))
748 bus = pci_read_config(dev, PCIR_SECBUS_1, 1);
751 if (!pci_pir_probe(bus, 1))
753 device_set_desc(dev, "PCIBIOS PCI-PCI bridge");