2 * Copyright (c) 1997, Stefan Esser <se@kfreebsd.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.
26 * $FreeBSD: src/sys/i386/pci/pci_bus.c,v 1.128.8.1 2009/04/15 03:14:26 kensmith Exp $
29 #include <sys/param.h>
30 #include <sys/systm.h>
32 #include <sys/kernel.h>
33 #include <sys/malloc.h>
34 #include <sys/module.h>
35 #include <sys/sysctl.h>
37 #include <bus/pci/pcivar.h>
38 #include <bus/pci/pcireg.h>
39 #include <bus/pci/pcib_private.h>
40 #include <bus/isa/isavar.h>
41 #include <machine/md_var.h>
43 #include "legacyvar.h"
44 #include "pci_cfgreg.h"
48 static int pcibios_pcib_route_interrupt(device_t pcib, device_t dev,
52 legacy_pcib_maxslots(device_t dev)
57 /* read configuration space register */
60 legacy_pcib_read_config(device_t dev, int bus, int slot, int func,
63 return(pci_cfgregread(bus, slot, func, reg, bytes));
66 /* write configuration space register */
69 legacy_pcib_write_config(device_t dev, int bus, int slot, int func,
70 int reg, u_int32_t data, int bytes)
72 pci_cfgregwrite(bus, slot, func, reg, data, bytes);
75 /* Pass MSI requests up to the nexus. */
78 legacy_pcib_alloc_msi(device_t pcib, device_t dev, int count, int maxcount,
83 bus = device_get_parent(pcib);
84 return (PCIB_ALLOC_MSI(device_get_parent(bus), dev, count, maxcount,
89 legacy_pcib_alloc_msix(device_t pcib, device_t dev, int *irq, int cpuid)
93 bus = device_get_parent(pcib);
94 return (PCIB_ALLOC_MSIX(device_get_parent(bus), dev, irq, cpuid));
98 legacy_pcib_map_msi(device_t pcib, device_t dev, int irq, uint64_t *addr,
99 uint32_t *data, int cpuid)
103 bus = device_get_parent(pcib);
104 return (PCIB_MAP_MSI(device_get_parent(bus), dev, irq, addr, data,
109 legacy_pcib_is_host_bridge(int bus, int slot, int func,
110 uint32_t id, uint8_t class, uint8_t subclass,
113 const char *s = NULL;
114 static uint8_t pxb[4]; /* hack for 450nx */
120 s = "Intel 824?? host to PCI bridge";
121 /* XXX This is a guess */
122 /* *busnum = legacy_pcib_read_config(0, bus, slot, func, 0x41, 1); */
126 s = "Intel 82810 (i810 GMCH) Host To Hub bridge";
129 s = "Intel 82810-DC100 (i810-DC100 GMCH) Host To Hub bridge";
132 s = "Intel 82810E (i810E GMCH) Host To Hub bridge";
135 s = "Intel 82815 (i815 GMCH) Host To Hub bridge";
138 s = "Intel 82443LX (440 LX) host to PCI bridge";
141 s = "Intel 82443BX (440 BX) host to PCI bridge";
144 s = "Intel 82443BX host to PCI bridge (AGP disabled)";
147 s = "Intel 82443MX host to PCI bridge";
150 s = "Intel 82443GX host to PCI bridge";
153 s = "Intel 82443GX host to AGP bridge";
156 s = "Intel 82443GX host to PCI bridge (AGP disabled)";
159 s = "Intel 82454KX/GX (Orion) host to PCI bridge";
160 *busnum = legacy_pcib_read_config(0, bus, slot, func, 0x4a, 1);
164 * For the 450nx chipset, there is a whole bundle of
165 * things pretending to be host bridges. The MIOC will
166 * be seen first and isn't really a pci bridge (the
167 * actual busses are attached to the PXB's). We need to
168 * read the registers of the MIOC to figure out the
169 * bus numbers for the PXB channels.
171 * Since the MIOC doesn't have a pci bus attached, we
172 * pretend it wasn't there.
174 pxb[0] = legacy_pcib_read_config(0, bus, slot, func,
175 0xd0, 1); /* BUSNO[0] */
176 pxb[1] = legacy_pcib_read_config(0, bus, slot, func,
177 0xd1, 1) + 1; /* SUBA[0]+1 */
178 pxb[2] = legacy_pcib_read_config(0, bus, slot, func,
179 0xd3, 1); /* BUSNO[1] */
180 pxb[3] = legacy_pcib_read_config(0, bus, slot, func,
181 0xd4, 1) + 1; /* SUBA[1]+1 */
186 s = "Intel 82454NX PXB#0, Bus#A";
190 s = "Intel 82454NX PXB#0, Bus#B";
194 s = "Intel 82454NX PXB#1, Bus#A";
198 s = "Intel 82454NX PXB#1, Bus#B";
204 /* AMD -- vendor 0x1022 */
206 s = "AMD Elan SC520 host to PCI bridge";
208 init_AMD_Elan_sc520();
211 "*** WARNING: missing CPU_ELAN -- timekeeping may be wrong\n");
215 s = "AMD-751 host to PCI bridge";
218 s = "AMD-761 host to PCI bridge";
221 /* SiS -- vendor 0x1039 */
232 s = "SiS 5591 host to PCI bridge";
235 s = "SiS 5591 host to AGP bridge";
238 /* VLSI -- vendor 0x1004 */
240 s = "VLSI 82C592 Host to PCI bridge";
243 /* XXX Here is MVP3, I got the datasheet but NO M/B to test it */
244 /* totally. Please let me know if anything wrong. -F */
245 /* XXX need info on the MVP3 -- any takers? */
247 s = "VIA 82C598MVP (Apollo MVP3) host bridge";
250 /* AcerLabs -- vendor 0x10b9 */
251 /* Funny : The datasheet told me vendor id is "10b8",sub-vendor */
252 /* id is '10b9" but the register always shows "10b9". -Foxfair */
254 s = "AcerLabs M1541 (Aladdin-V) PCI host bridge";
257 /* OPTi -- vendor 0x1045 */
259 s = "OPTi 82C700 host to PCI bridge";
262 s = "OPTi 82C822 host to PCI Bridge";
265 /* ServerWorks -- vendor 0x1166 */
267 s = "ServerWorks NB6536 2.0HE host to PCI bridge";
268 *busnum = legacy_pcib_read_config(0, bus, slot, func, 0x44, 1);
277 case 0x010f1014: /* IBM re-badged ServerWorks chipset */
278 s = "ServerWorks host to PCI bridge";
279 *busnum = legacy_pcib_read_config(0, bus, slot, func, 0x44, 1);
283 s = "ServerWorks NB6635 3.0LE host to PCI bridge";
284 *busnum = legacy_pcib_read_config(0, bus, slot, func, 0x44, 1);
288 s = "ServerWorks CIOB30 host to PCI bridge";
289 *busnum = legacy_pcib_read_config(0, bus, slot, func, 0x44, 1);
294 case 0x03021014: /* IBM re-badged ServerWorks chipset */
295 s = "ServerWorks CMIC-HE host to PCI-X bridge";
296 *busnum = legacy_pcib_read_config(0, bus, slot, func, 0x44, 1);
299 /* XXX unknown chipset, but working */
303 s = "ServerWorks host to PCI bridge(unknown chipset)";
304 *busnum = legacy_pcib_read_config(0, bus, slot, func, 0x44, 1);
307 /* Compaq/HP -- vendor 0x0e11 */
309 s = "Compaq/HP Model 6010 HotPlug PCI Bridge";
310 *busnum = legacy_pcib_read_config(0, bus, slot, func, 0xc8, 1);
313 /* Integrated Micro Solutions -- vendor 0x10e0 */
315 s = "Integrated Micro Solutions VL Bridge";
319 if (class == PCIC_BRIDGE && subclass == PCIS_BRIDGE_HOST)
320 s = "Host to PCI bridge";
328 * Scan the first pci bus for host-pci bridges and add pcib instances
329 * to the nexus for each bridge.
332 legacy_pcib_identify(driver_t *driver, device_t parent)
341 devclass_t pci_devclass;
343 if (pci_cfgregopen() == 0)
346 * Check to see if we haven't already had a PCI bus added
347 * via some other means. If we have, bail since otherwise
348 * we're going to end up duplicating it.
350 if ((pci_devclass = devclass_find("pci")) &&
351 devclass_get_device(pci_devclass, 0))
356 for (slot = 0; slot <= PCI_SLOTMAX; slot++) {
358 hdrtype = legacy_pcib_read_config(0, bus, slot, func,
361 * When enumerating bus devices, the standard says that
362 * one should check the header type and ignore the slots whose
363 * header types that the software doesn't know about. We use
364 * this to filter out devices.
366 if ((hdrtype & PCIM_HDRTYPE) > PCI_MAXHDRTYPE)
368 if ((hdrtype & PCIM_MFDEV) &&
369 (!found_orion || hdrtype != 0xff))
370 pcifunchigh = PCI_FUNCMAX;
373 for (func = 0; func <= pcifunchigh; func++) {
375 * Read the IDs and class from the device.
378 u_int8_t class, subclass, busnum;
383 id = legacy_pcib_read_config(0, bus, slot, func,
387 class = legacy_pcib_read_config(0, bus, slot, func,
389 subclass = legacy_pcib_read_config(0, bus, slot, func,
392 s = legacy_pcib_is_host_bridge(bus, slot, func,
399 * Check to see if the physical bus has already
400 * been seen. Eg: hybrid 32 and 64 bit host
401 * bridges to the same logical bus.
403 if (device_get_children(parent, &devs, &ndevs) == 0) {
404 for (i = 0; s != NULL && i < ndevs; i++) {
405 if (strcmp(device_get_name(devs[i]),
408 if (legacy_get_pcibus(devs[i]) == busnum)
418 * Add at priority 100 to make sure we
419 * go after any motherboard resources
421 child = BUS_ADD_CHILD(parent, parent, 100 + busnum,
423 device_set_desc(child, s);
424 legacy_set_pcibus(child, busnum);
427 if (id == 0x12258086)
429 if (id == 0x84c48086)
433 if (found824xx && bus == 0) {
439 * Make sure we add at least one bridge since some old
440 * hardware doesn't actually have a host-pci bridge device.
441 * Note that pci_cfgregopen() thinks we have PCI devices..
446 "legacy_pcib_identify: no bridge found, adding pcib0 anyway\n");
447 child = BUS_ADD_CHILD(parent, parent, 100, "pcib", 0);
448 legacy_set_pcibus(child, 0);
454 legacy_pcib_probe(device_t dev)
456 if (pci_cfgregopen() == 0)
462 legacy_pcib_attach(device_t dev)
468 * Look for a PCI BIOS interrupt routing table as that will be
469 * our method of routing interrupts if we have one.
471 bus = pcib_get_bus(dev);
472 if (pci_pir_probe(bus, 0)) {
473 pir = BUS_ADD_CHILD(device_get_parent(dev), device_get_parent(dev), 0, "pir", 0);
475 device_probe_and_attach(pir);
477 device_add_child(dev, "pci", bus);
478 return bus_generic_attach(dev);
482 legacy_pcib_read_ivar(device_t dev, device_t child, int which,
487 case PCIB_IVAR_DOMAIN:
491 *result = legacy_get_pcibus(dev);
498 legacy_pcib_write_ivar(device_t dev, device_t child, int which,
503 case PCIB_IVAR_DOMAIN:
506 legacy_set_pcibus(dev, value);
512 SYSCTL_DECL(_hw_pci);
514 static unsigned long legacy_host_mem_start = 0x80000000;
515 /* XXX need TUNABLE_ULONG */
516 TUNABLE_INT("hw.pci.host_mem_start", (int *)&legacy_host_mem_start);
517 SYSCTL_ULONG(_hw_pci, OID_AUTO, host_mem_start, CTLFLAG_RD,
518 &legacy_host_mem_start, 0x80000000,
519 "Limit the host bridge memory to being above this address. Must be\n\
520 set at boot via a tunable.");
523 legacy_pcib_alloc_resource(device_t dev, device_t child, int type, int *rid,
524 u_long start, u_long end, u_long count, u_int flags, int cpuid)
527 * If no memory preference is given, use upper 32MB slot most
528 * bioses use for their memory window. Typically other bridges
529 * before us get in the way to assert their preferences on memory.
530 * Hardcoding like this sucks, so a more MD/MI way needs to be
531 * found to do it. This is typically only used on older laptops
532 * that don't have pci busses behind pci bridge, so assuming > 32MB
535 * However, this can cause problems for other chipsets, so we make
536 * this tunable by hw.pci.host_mem_start.
538 if (type == SYS_RES_MEMORY && start == 0UL && end == ~0UL)
539 start = legacy_host_mem_start;
540 if (type == SYS_RES_IOPORT && start == 0UL && end == ~0UL)
542 return (bus_generic_alloc_resource(dev, child, type, rid, start, end,
543 count, flags, cpuid));
546 static device_method_t legacy_pcib_methods[] = {
547 /* Device interface */
548 DEVMETHOD(device_identify, legacy_pcib_identify),
549 DEVMETHOD(device_probe, legacy_pcib_probe),
550 DEVMETHOD(device_attach, legacy_pcib_attach),
551 DEVMETHOD(device_shutdown, bus_generic_shutdown),
552 DEVMETHOD(device_suspend, bus_generic_suspend),
553 DEVMETHOD(device_resume, bus_generic_resume),
556 DEVMETHOD(bus_print_child, bus_generic_print_child),
557 DEVMETHOD(bus_read_ivar, legacy_pcib_read_ivar),
558 DEVMETHOD(bus_write_ivar, legacy_pcib_write_ivar),
559 DEVMETHOD(bus_alloc_resource, legacy_pcib_alloc_resource),
560 DEVMETHOD(bus_release_resource, bus_generic_release_resource),
561 DEVMETHOD(bus_activate_resource, bus_generic_activate_resource),
562 DEVMETHOD(bus_deactivate_resource, bus_generic_deactivate_resource),
563 DEVMETHOD(bus_setup_intr, bus_generic_setup_intr),
564 DEVMETHOD(bus_teardown_intr, bus_generic_teardown_intr),
567 DEVMETHOD(pcib_maxslots, legacy_pcib_maxslots),
568 DEVMETHOD(pcib_read_config, legacy_pcib_read_config),
569 DEVMETHOD(pcib_write_config, legacy_pcib_write_config),
570 DEVMETHOD(pcib_route_interrupt, pcibios_pcib_route_interrupt),
571 DEVMETHOD(pcib_alloc_msi, legacy_pcib_alloc_msi),
572 DEVMETHOD(pcib_release_msi, pcib_release_msi),
573 DEVMETHOD(pcib_alloc_msix, legacy_pcib_alloc_msix),
574 DEVMETHOD(pcib_release_msix, pcib_release_msix),
575 DEVMETHOD(pcib_map_msi, legacy_pcib_map_msi),
579 static devclass_t hostb_devclass;
581 DEFINE_CLASS_0(pcib, legacy_pcib_driver, legacy_pcib_methods, 1);
582 DRIVER_MODULE(pcib, legacy, legacy_pcib_driver, hostb_devclass, NULL, NULL);
586 * Install placeholder to claim the resources owned by the
587 * PCI bus interface. This could be used to extract the
588 * config space registers in the extreme case where the PnP
589 * ID is available and the PCI BIOS isn't, but for now we just
590 * eat the PnP ID and do nothing else.
592 * XXX we should silence this probe, as it will generally confuse
595 static struct isa_pnp_id pcibus_pnp_ids[] = {
596 { 0x030ad041 /* PNP0A03 */, "PCI Bus" },
601 pcibus_pnp_probe(device_t dev)
605 if ((result = ISA_PNP_PROBE(device_get_parent(dev), dev, pcibus_pnp_ids)) <= 0)
611 pcibus_pnp_attach(device_t dev)
616 static device_method_t pcibus_pnp_methods[] = {
617 /* Device interface */
618 DEVMETHOD(device_probe, pcibus_pnp_probe),
619 DEVMETHOD(device_attach, pcibus_pnp_attach),
620 DEVMETHOD(device_detach, bus_generic_detach),
621 DEVMETHOD(device_shutdown, bus_generic_shutdown),
622 DEVMETHOD(device_suspend, bus_generic_suspend),
623 DEVMETHOD(device_resume, bus_generic_resume),
627 static devclass_t pcibus_pnp_devclass;
629 DEFINE_CLASS_0(pcibus_pnp, pcibus_pnp_driver, pcibus_pnp_methods, 1);
630 DRIVER_MODULE(pcibus_pnp, isa, pcibus_pnp_driver, pcibus_pnp_devclass, NULL, NULL);
634 * Provide a PCI-PCI bridge driver for PCI busses behind PCI-PCI bridges
635 * that appear in the PCIBIOS Interrupt Routing Table to use the routing
636 * table for interrupt routing when possible.
638 static int pcibios_pcib_probe(device_t bus);
640 static device_method_t pcibios_pcib_pci_methods[] = {
641 /* Device interface */
642 DEVMETHOD(device_probe, pcibios_pcib_probe),
643 DEVMETHOD(device_attach, pcib_attach),
644 DEVMETHOD(device_shutdown, bus_generic_shutdown),
645 DEVMETHOD(device_suspend, bus_generic_suspend),
646 DEVMETHOD(device_resume, bus_generic_resume),
649 DEVMETHOD(bus_print_child, bus_generic_print_child),
650 DEVMETHOD(bus_read_ivar, pcib_read_ivar),
651 DEVMETHOD(bus_write_ivar, pcib_write_ivar),
652 DEVMETHOD(bus_alloc_resource, pcib_alloc_resource),
653 DEVMETHOD(bus_release_resource, bus_generic_release_resource),
654 DEVMETHOD(bus_activate_resource, bus_generic_activate_resource),
655 DEVMETHOD(bus_deactivate_resource, bus_generic_deactivate_resource),
656 DEVMETHOD(bus_setup_intr, bus_generic_setup_intr),
657 DEVMETHOD(bus_teardown_intr, bus_generic_teardown_intr),
660 DEVMETHOD(pcib_maxslots, pcib_maxslots),
661 DEVMETHOD(pcib_read_config, pcib_read_config),
662 DEVMETHOD(pcib_write_config, pcib_write_config),
663 DEVMETHOD(pcib_route_interrupt, pcibios_pcib_route_interrupt),
664 DEVMETHOD(pcib_alloc_msi, pcib_alloc_msi),
665 DEVMETHOD(pcib_release_msi, pcib_release_msi),
666 DEVMETHOD(pcib_alloc_msix, pcib_alloc_msix),
667 DEVMETHOD(pcib_release_msix, pcib_release_msix),
668 DEVMETHOD(pcib_map_msi, pcib_map_msi),
673 static devclass_t pcib_devclass;
675 DEFINE_CLASS_0(pcib, pcibios_pcib_driver, pcibios_pcib_pci_methods,
676 sizeof(struct pcib_softc));
677 DRIVER_MODULE(pcibios_pcib, pci, pcibios_pcib_driver, pcib_devclass, NULL, NULL);
680 pcibios_pcib_probe(device_t dev)
684 if ((pci_get_class(dev) != PCIC_BRIDGE) ||
685 (pci_get_subclass(dev) != PCIS_BRIDGE_PCI))
687 bus = pci_read_config(dev, PCIR_SECBUS_1, 1);
690 if (!pci_pir_probe(bus, 1))
692 device_set_desc(dev, "PCIBIOS PCI-PCI bridge");
697 pcibios_pcib_route_interrupt(device_t pcib, device_t dev, int pin)
699 return (pci_pir_route_interrupt(pci_get_bus(dev), pci_get_slot(dev),
700 pci_get_function(dev), pin));