2 * Copyright (c) 1997, Stefan Esser <se@freebsd.org>
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice unmodified, this list of conditions, and the following
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD$");
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 <machine/legacyvar.h>
49 #include <machine/pci_cfgreg.h>
50 #include <machine/resource.h>
54 static int pcibios_pcib_route_interrupt(device_t pcib, device_t dev,
58 legacy_pcib_maxslots(device_t dev)
63 /* read configuration space register */
66 legacy_pcib_read_config(device_t dev, u_int bus, u_int slot, u_int func,
69 return(pci_cfgregread(bus, slot, func, reg, bytes));
72 /* write configuration space register */
75 legacy_pcib_write_config(device_t dev, u_int bus, u_int slot, u_int func,
76 u_int reg, u_int32_t data, int bytes)
78 pci_cfgregwrite(bus, slot, func, reg, data, bytes);
81 /* Pass MSI requests up to the nexus. */
84 legacy_pcib_alloc_msi(device_t pcib, device_t dev, int count, int maxcount,
89 bus = device_get_parent(pcib);
90 return (PCIB_ALLOC_MSI(device_get_parent(bus), dev, count, maxcount,
95 legacy_pcib_alloc_msix(device_t pcib, device_t dev, int *irq)
99 bus = device_get_parent(pcib);
100 return (PCIB_ALLOC_MSIX(device_get_parent(bus), dev, irq));
104 legacy_pcib_map_msi(device_t pcib, device_t dev, int irq, uint64_t *addr,
109 bus = device_get_parent(pcib);
110 return (PCIB_MAP_MSI(device_get_parent(bus), dev, irq, addr, data));
114 legacy_pcib_is_host_bridge(int bus, int slot, int func,
115 uint32_t id, uint8_t class, uint8_t subclass,
118 const char *s = NULL;
119 static uint8_t pxb[4]; /* hack for 450nx */
125 s = "Intel 824?? host to PCI bridge";
126 /* XXX This is a guess */
127 /* *busnum = legacy_pcib_read_config(0, bus, slot, func, 0x41, 1); */
131 s = "Intel 82810 (i810 GMCH) Host To Hub bridge";
134 s = "Intel 82810-DC100 (i810-DC100 GMCH) Host To Hub bridge";
137 s = "Intel 82810E (i810E GMCH) Host To Hub bridge";
140 s = "Intel 82815 (i815 GMCH) Host To Hub bridge";
143 s = "Intel 82443LX (440 LX) host to PCI bridge";
146 s = "Intel 82443BX (440 BX) host to PCI bridge";
149 s = "Intel 82443BX host to PCI bridge (AGP disabled)";
152 s = "Intel 82443MX host to PCI bridge";
155 s = "Intel 82443GX host to PCI bridge";
158 s = "Intel 82443GX host to AGP bridge";
161 s = "Intel 82443GX host to PCI bridge (AGP disabled)";
164 s = "Intel 82454KX/GX (Orion) host to PCI bridge";
165 *busnum = legacy_pcib_read_config(0, bus, slot, func, 0x4a, 1);
169 * For the 450nx chipset, there is a whole bundle of
170 * things pretending to be host bridges. The MIOC will
171 * be seen first and isn't really a pci bridge (the
172 * actual busses are attached to the PXB's). We need to
173 * read the registers of the MIOC to figure out the
174 * bus numbers for the PXB channels.
176 * Since the MIOC doesn't have a pci bus attached, we
177 * pretend it wasn't there.
179 pxb[0] = legacy_pcib_read_config(0, bus, slot, func,
180 0xd0, 1); /* BUSNO[0] */
181 pxb[1] = legacy_pcib_read_config(0, bus, slot, func,
182 0xd1, 1) + 1; /* SUBA[0]+1 */
183 pxb[2] = legacy_pcib_read_config(0, bus, slot, func,
184 0xd3, 1); /* BUSNO[1] */
185 pxb[3] = legacy_pcib_read_config(0, bus, slot, func,
186 0xd4, 1) + 1; /* SUBA[1]+1 */
191 s = "Intel 82454NX PXB#0, Bus#A";
195 s = "Intel 82454NX PXB#0, Bus#B";
199 s = "Intel 82454NX PXB#1, Bus#A";
203 s = "Intel 82454NX PXB#1, Bus#B";
209 s = "Intel 82845 Host to PCI bridge";
212 /* AMD -- vendor 0x1022 */
214 s = "AMD Elan SC520 host to PCI bridge";
216 init_AMD_Elan_sc520();
219 "*** WARNING: missing CPU_ELAN -- timekeeping may be wrong\n");
223 s = "AMD-751 host to PCI bridge";
226 s = "AMD-761 host to PCI bridge";
229 /* SiS -- vendor 0x1039 */
240 s = "SiS 5591 host to PCI bridge";
243 s = "SiS 5591 host to AGP bridge";
246 /* VLSI -- vendor 0x1004 */
248 s = "VLSI 82C592 Host to PCI bridge";
251 /* XXX Here is MVP3, I got the datasheet but NO M/B to test it */
252 /* totally. Please let me know if anything wrong. -F */
253 /* XXX need info on the MVP3 -- any takers? */
255 s = "VIA 82C598MVP (Apollo MVP3) host bridge";
258 /* AcerLabs -- vendor 0x10b9 */
259 /* Funny : The datasheet told me vendor id is "10b8",sub-vendor */
260 /* id is '10b9" but the register always shows "10b9". -Foxfair */
262 s = "AcerLabs M1541 (Aladdin-V) PCI host bridge";
265 /* OPTi -- vendor 0x1045 */
267 s = "OPTi 82C700 host to PCI bridge";
270 s = "OPTi 82C822 host to PCI Bridge";
273 /* ServerWorks -- vendor 0x1166 */
275 s = "ServerWorks NB6536 2.0HE host to PCI bridge";
276 *busnum = legacy_pcib_read_config(0, bus, slot, func, 0x44, 1);
285 case 0x010f1014: /* IBM re-badged ServerWorks chipset */
286 s = "ServerWorks host to PCI bridge";
287 *busnum = legacy_pcib_read_config(0, bus, slot, func, 0x44, 1);
291 s = "ServerWorks NB6635 3.0LE host to PCI bridge";
292 *busnum = legacy_pcib_read_config(0, bus, slot, func, 0x44, 1);
296 s = "ServerWorks CIOB30 host to PCI bridge";
297 *busnum = legacy_pcib_read_config(0, bus, slot, func, 0x44, 1);
302 case 0x03021014: /* IBM re-badged ServerWorks chipset */
303 s = "ServerWorks CMIC-HE host to PCI-X bridge";
304 *busnum = legacy_pcib_read_config(0, bus, slot, func, 0x44, 1);
307 /* XXX unknown chipset, but working */
313 s = "ServerWorks host to PCI bridge(unknown chipset)";
314 *busnum = legacy_pcib_read_config(0, bus, slot, func, 0x44, 1);
317 /* Compaq/HP -- vendor 0x0e11 */
319 s = "Compaq/HP Model 6010 HotPlug PCI Bridge";
320 *busnum = legacy_pcib_read_config(0, bus, slot, func, 0xc8, 1);
323 /* Integrated Micro Solutions -- vendor 0x10e0 */
325 s = "Integrated Micro Solutions VL Bridge";
329 if (class == PCIC_BRIDGE && subclass == PCIS_BRIDGE_HOST)
330 s = "Host to PCI bridge";
338 * Scan the first pci bus for host-pci bridges and add pcib instances
339 * to the nexus for each bridge.
342 legacy_pcib_identify(driver_t *driver, device_t parent)
351 devclass_t pci_devclass;
353 if (pci_cfgregopen() == 0)
356 * Check to see if we haven't already had a PCI bus added
357 * via some other means. If we have, bail since otherwise
358 * we're going to end up duplicating it.
360 if ((pci_devclass = devclass_find("pci")) &&
361 devclass_get_device(pci_devclass, 0))
367 for (slot = 0; slot <= PCI_SLOTMAX; slot++) {
369 hdrtype = legacy_pcib_read_config(0, bus, slot, func,
372 * When enumerating bus devices, the standard says that
373 * one should check the header type and ignore the slots whose
374 * header types that the software doesn't know about. We use
375 * this to filter out devices.
377 if ((hdrtype & PCIM_HDRTYPE) > PCI_MAXHDRTYPE)
379 if ((hdrtype & PCIM_MFDEV) &&
380 (!found_orion || hdrtype != 0xff))
381 pcifunchigh = PCI_FUNCMAX;
384 for (func = 0; func <= pcifunchigh; func++) {
386 * Read the IDs and class from the device.
389 u_int8_t class, subclass, busnum;
394 id = legacy_pcib_read_config(0, bus, slot, func,
398 class = legacy_pcib_read_config(0, bus, slot, func,
400 subclass = legacy_pcib_read_config(0, bus, slot, func,
403 s = legacy_pcib_is_host_bridge(bus, slot, func,
410 * Check to see if the physical bus has already
411 * been seen. Eg: hybrid 32 and 64 bit host
412 * bridges to the same logical bus.
414 if (device_get_children(parent, &devs, &ndevs) == 0) {
415 for (i = 0; s != NULL && i < ndevs; i++) {
416 if (strcmp(device_get_name(devs[i]),
419 if (legacy_get_pcibus(devs[i]) == busnum)
428 * Add at priority 100 to make sure we
429 * go after any motherboard resources
431 child = BUS_ADD_CHILD(parent, 100,
433 device_set_desc(child, s);
434 legacy_set_pcibus(child, busnum);
437 if (id == 0x12258086)
439 if (id == 0x84c48086)
443 if (found824xx && bus == 0) {
449 * Make sure we add at least one bridge since some old
450 * hardware doesn't actually have a host-pci bridge device.
451 * Note that pci_cfgregopen() thinks we have PCI devices..
456 "legacy_pcib_identify: no bridge found, adding pcib0 anyway\n");
457 child = BUS_ADD_CHILD(parent, 100, "pcib", 0);
458 legacy_set_pcibus(child, 0);
463 legacy_pcib_probe(device_t dev)
466 if (pci_cfgregopen() == 0)
472 legacy_pcib_attach(device_t dev)
478 * Look for a PCI BIOS interrupt routing table as that will be
479 * our method of routing interrupts if we have one.
481 bus = pcib_get_bus(dev);
482 if (pci_pir_probe(bus, 0)) {
483 pir = BUS_ADD_CHILD(device_get_parent(dev), 0, "pir", 0);
485 device_probe_and_attach(pir);
487 device_add_child(dev, "pci", bus);
488 return bus_generic_attach(dev);
492 legacy_pcib_read_ivar(device_t dev, device_t child, int which,
497 case PCIB_IVAR_DOMAIN:
501 *result = legacy_get_pcibus(dev);
508 legacy_pcib_write_ivar(device_t dev, device_t child, int which,
513 case PCIB_IVAR_DOMAIN:
516 legacy_set_pcibus(dev, value);
522 SYSCTL_DECL(_hw_pci);
524 static unsigned long legacy_host_mem_start = 0x80000000;
525 TUNABLE_ULONG("hw.pci.host_mem_start", &legacy_host_mem_start);
526 SYSCTL_ULONG(_hw_pci, OID_AUTO, host_mem_start, CTLFLAG_RDTUN,
527 &legacy_host_mem_start, 0x80000000,
528 "Limit the host bridge memory to being above this address. Must be\n\
529 set at boot via a tunable.");
532 legacy_pcib_alloc_resource(device_t dev, device_t child, int type, int *rid,
533 u_long start, u_long end, u_long count, u_int flags)
536 * If no memory preference is given, use upper 32MB slot most
537 * bioses use for their memory window. Typically other bridges
538 * before us get in the way to assert their preferences on memory.
539 * Hardcoding like this sucks, so a more MD/MI way needs to be
540 * found to do it. This is typically only used on older laptops
541 * that don't have pci busses behind pci bridge, so assuming > 32MB
544 * However, this can cause problems for other chipsets, so we make
545 * this tunable by hw.pci.host_mem_start.
547 if (type == SYS_RES_MEMORY && start == 0UL && end == ~0UL)
548 start = legacy_host_mem_start;
549 if (type == SYS_RES_IOPORT && start == 0UL && end == ~0UL)
551 return (bus_generic_alloc_resource(dev, child, type, rid, start, end,
555 static device_method_t legacy_pcib_methods[] = {
556 /* Device interface */
557 DEVMETHOD(device_identify, legacy_pcib_identify),
558 DEVMETHOD(device_probe, legacy_pcib_probe),
559 DEVMETHOD(device_attach, legacy_pcib_attach),
560 DEVMETHOD(device_shutdown, bus_generic_shutdown),
561 DEVMETHOD(device_suspend, bus_generic_suspend),
562 DEVMETHOD(device_resume, bus_generic_resume),
565 DEVMETHOD(bus_print_child, bus_generic_print_child),
566 DEVMETHOD(bus_read_ivar, legacy_pcib_read_ivar),
567 DEVMETHOD(bus_write_ivar, legacy_pcib_write_ivar),
568 DEVMETHOD(bus_alloc_resource, legacy_pcib_alloc_resource),
569 DEVMETHOD(bus_adjust_resource, bus_generic_adjust_resource),
570 DEVMETHOD(bus_release_resource, bus_generic_release_resource),
571 DEVMETHOD(bus_activate_resource, bus_generic_activate_resource),
572 DEVMETHOD(bus_deactivate_resource, bus_generic_deactivate_resource),
573 DEVMETHOD(bus_setup_intr, bus_generic_setup_intr),
574 DEVMETHOD(bus_teardown_intr, bus_generic_teardown_intr),
577 DEVMETHOD(pcib_maxslots, legacy_pcib_maxslots),
578 DEVMETHOD(pcib_read_config, legacy_pcib_read_config),
579 DEVMETHOD(pcib_write_config, legacy_pcib_write_config),
580 DEVMETHOD(pcib_route_interrupt, pcibios_pcib_route_interrupt),
581 DEVMETHOD(pcib_alloc_msi, legacy_pcib_alloc_msi),
582 DEVMETHOD(pcib_release_msi, pcib_release_msi),
583 DEVMETHOD(pcib_alloc_msix, legacy_pcib_alloc_msix),
584 DEVMETHOD(pcib_release_msix, pcib_release_msix),
585 DEVMETHOD(pcib_map_msi, legacy_pcib_map_msi),
590 static devclass_t hostb_devclass;
592 DEFINE_CLASS_0(pcib, legacy_pcib_driver, legacy_pcib_methods, 1);
593 DRIVER_MODULE(pcib, legacy, legacy_pcib_driver, hostb_devclass, 0, 0);
597 * Install placeholder to claim the resources owned by the
598 * PCI bus interface. This could be used to extract the
599 * config space registers in the extreme case where the PnP
600 * ID is available and the PCI BIOS isn't, but for now we just
601 * eat the PnP ID and do nothing else.
603 * XXX we should silence this probe, as it will generally confuse
606 static struct isa_pnp_id pcibus_pnp_ids[] = {
607 { 0x030ad041 /* PNP0A03 */, "PCI Bus" },
608 { 0x080ad041 /* PNP0A08 */, "PCIe Bus" },
613 pcibus_pnp_probe(device_t dev)
617 if ((result = ISA_PNP_PROBE(device_get_parent(dev), dev, pcibus_pnp_ids)) <= 0)
623 pcibus_pnp_attach(device_t dev)
628 static device_method_t pcibus_pnp_methods[] = {
629 /* Device interface */
630 DEVMETHOD(device_probe, pcibus_pnp_probe),
631 DEVMETHOD(device_attach, pcibus_pnp_attach),
632 DEVMETHOD(device_detach, bus_generic_detach),
633 DEVMETHOD(device_shutdown, bus_generic_shutdown),
634 DEVMETHOD(device_suspend, bus_generic_suspend),
635 DEVMETHOD(device_resume, bus_generic_resume),
639 static devclass_t pcibus_pnp_devclass;
641 DEFINE_CLASS_0(pcibus_pnp, pcibus_pnp_driver, pcibus_pnp_methods, 1);
642 DRIVER_MODULE(pcibus_pnp, isa, pcibus_pnp_driver, pcibus_pnp_devclass, 0, 0);
646 * Provide a PCI-PCI bridge driver for PCI busses behind PCI-PCI bridges
647 * that appear in the PCIBIOS Interrupt Routing Table to use the routing
648 * table for interrupt routing when possible.
650 static int pcibios_pcib_probe(device_t bus);
652 static device_method_t pcibios_pcib_pci_methods[] = {
653 /* Device interface */
654 DEVMETHOD(device_probe, pcibios_pcib_probe),
655 DEVMETHOD(device_attach, pcib_attach),
656 DEVMETHOD(device_shutdown, bus_generic_shutdown),
657 DEVMETHOD(device_suspend, bus_generic_suspend),
658 DEVMETHOD(device_resume, bus_generic_resume),
661 DEVMETHOD(bus_print_child, bus_generic_print_child),
662 DEVMETHOD(bus_read_ivar, pcib_read_ivar),
663 DEVMETHOD(bus_write_ivar, pcib_write_ivar),
664 DEVMETHOD(bus_alloc_resource, pcib_alloc_resource),
665 DEVMETHOD(bus_release_resource, bus_generic_release_resource),
666 DEVMETHOD(bus_activate_resource, bus_generic_activate_resource),
667 DEVMETHOD(bus_deactivate_resource, bus_generic_deactivate_resource),
668 DEVMETHOD(bus_setup_intr, bus_generic_setup_intr),
669 DEVMETHOD(bus_teardown_intr, bus_generic_teardown_intr),
672 DEVMETHOD(pcib_maxslots, pcib_maxslots),
673 DEVMETHOD(pcib_read_config, pcib_read_config),
674 DEVMETHOD(pcib_write_config, pcib_write_config),
675 DEVMETHOD(pcib_route_interrupt, pcibios_pcib_route_interrupt),
676 DEVMETHOD(pcib_alloc_msi, pcib_alloc_msi),
677 DEVMETHOD(pcib_release_msi, pcib_release_msi),
678 DEVMETHOD(pcib_alloc_msix, pcib_alloc_msix),
679 DEVMETHOD(pcib_release_msix, pcib_release_msix),
680 DEVMETHOD(pcib_map_msi, pcib_map_msi),
685 static devclass_t pcib_devclass;
687 DEFINE_CLASS_0(pcib, pcibios_pcib_driver, pcibios_pcib_pci_methods,
688 sizeof(struct pcib_softc));
689 DRIVER_MODULE(pcibios_pcib, pci, pcibios_pcib_driver, pcib_devclass, 0, 0);
692 pcibios_pcib_probe(device_t dev)
696 if ((pci_get_class(dev) != PCIC_BRIDGE) ||
697 (pci_get_subclass(dev) != PCIS_BRIDGE_PCI))
699 bus = pci_read_config(dev, PCIR_SECBUS_1, 1);
702 if (!pci_pir_probe(bus, 1))
704 device_set_desc(dev, "PCIBIOS PCI-PCI bridge");
709 pcibios_pcib_route_interrupt(device_t pcib, device_t dev, int pin)
711 return (pci_pir_route_interrupt(pci_get_bus(dev), pci_get_slot(dev),
712 pci_get_function(dev), pin));