2 * Copyright (c) 1994,1995 Stefan Esser, Wolfgang StanglMeier
3 * Copyright (c) 2000 Michael Smith <msmith@freebsd.org>
4 * Copyright (c) 2000 BSDi
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, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. The name of the author may not be used to endorse or promote products
16 * derived from this software without specific prior written permission.
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 #include <sys/cdefs.h>
32 __FBSDID("$FreeBSD$");
35 * PCI:PCI bridge support.
38 #include <sys/param.h>
40 #include <sys/kernel.h>
41 #include <sys/malloc.h>
42 #include <sys/module.h>
44 #include <sys/sysctl.h>
45 #include <sys/systm.h>
47 #include <dev/pci/pcivar.h>
48 #include <dev/pci/pcireg.h>
49 #include <dev/pci/pci_private.h>
50 #include <dev/pci/pcib_private.h>
54 static int pcib_probe(device_t dev);
55 static int pcib_suspend(device_t dev);
56 static int pcib_resume(device_t dev);
57 static int pcib_power_for_sleep(device_t pcib, device_t dev,
59 static uint16_t pcib_ari_get_rid(device_t pcib, device_t dev);
60 static uint32_t pcib_read_config(device_t dev, u_int b, u_int s,
61 u_int f, u_int reg, int width);
62 static void pcib_write_config(device_t dev, u_int b, u_int s,
63 u_int f, u_int reg, uint32_t val, int width);
64 static int pcib_ari_maxslots(device_t dev);
65 static int pcib_ari_maxfuncs(device_t dev);
66 static int pcib_try_enable_ari(device_t pcib, device_t dev);
67 static int pcib_ari_enabled(device_t pcib);
68 static void pcib_ari_decode_rid(device_t pcib, uint16_t rid,
69 int *bus, int *slot, int *func);
71 static device_method_t pcib_methods[] = {
72 /* Device interface */
73 DEVMETHOD(device_probe, pcib_probe),
74 DEVMETHOD(device_attach, pcib_attach),
75 DEVMETHOD(device_detach, bus_generic_detach),
76 DEVMETHOD(device_shutdown, bus_generic_shutdown),
77 DEVMETHOD(device_suspend, pcib_suspend),
78 DEVMETHOD(device_resume, pcib_resume),
81 DEVMETHOD(bus_read_ivar, pcib_read_ivar),
82 DEVMETHOD(bus_write_ivar, pcib_write_ivar),
83 DEVMETHOD(bus_alloc_resource, pcib_alloc_resource),
85 DEVMETHOD(bus_adjust_resource, pcib_adjust_resource),
86 DEVMETHOD(bus_release_resource, pcib_release_resource),
88 DEVMETHOD(bus_adjust_resource, bus_generic_adjust_resource),
89 DEVMETHOD(bus_release_resource, bus_generic_release_resource),
91 DEVMETHOD(bus_activate_resource, bus_generic_activate_resource),
92 DEVMETHOD(bus_deactivate_resource, bus_generic_deactivate_resource),
93 DEVMETHOD(bus_setup_intr, bus_generic_setup_intr),
94 DEVMETHOD(bus_teardown_intr, bus_generic_teardown_intr),
97 DEVMETHOD(pcib_maxslots, pcib_ari_maxslots),
98 DEVMETHOD(pcib_maxfuncs, pcib_ari_maxfuncs),
99 DEVMETHOD(pcib_read_config, pcib_read_config),
100 DEVMETHOD(pcib_write_config, pcib_write_config),
101 DEVMETHOD(pcib_route_interrupt, pcib_route_interrupt),
102 DEVMETHOD(pcib_alloc_msi, pcib_alloc_msi),
103 DEVMETHOD(pcib_release_msi, pcib_release_msi),
104 DEVMETHOD(pcib_alloc_msix, pcib_alloc_msix),
105 DEVMETHOD(pcib_release_msix, pcib_release_msix),
106 DEVMETHOD(pcib_map_msi, pcib_map_msi),
107 DEVMETHOD(pcib_power_for_sleep, pcib_power_for_sleep),
108 DEVMETHOD(pcib_get_rid, pcib_ari_get_rid),
109 DEVMETHOD(pcib_try_enable_ari, pcib_try_enable_ari),
110 DEVMETHOD(pcib_ari_enabled, pcib_ari_enabled),
111 DEVMETHOD(pcib_decode_rid, pcib_ari_decode_rid),
116 static devclass_t pcib_devclass;
118 DEFINE_CLASS_0(pcib, pcib_driver, pcib_methods, sizeof(struct pcib_softc));
119 DRIVER_MODULE(pcib, pci, pcib_driver, pcib_devclass, NULL, NULL);
122 SYSCTL_DECL(_hw_pci);
124 static int pci_clear_pcib;
125 SYSCTL_INT(_hw_pci, OID_AUTO, clear_pcib, CTLFLAG_RDTUN, &pci_clear_pcib, 0,
126 "Clear firmware-assigned resources for PCI-PCI bridge I/O windows.");
129 * Is a resource from a child device sub-allocated from one of our
133 pcib_is_resource_managed(struct pcib_softc *sc, int type, struct resource *r)
139 return (rman_is_region_manager(r, &sc->bus.rman));
142 return (rman_is_region_manager(r, &sc->io.rman));
144 /* Prefetchable resources may live in either memory rman. */
145 if (rman_get_flags(r) & RF_PREFETCHABLE &&
146 rman_is_region_manager(r, &sc->pmem.rman))
148 return (rman_is_region_manager(r, &sc->mem.rman));
154 pcib_is_window_open(struct pcib_window *pw)
157 return (pw->valid && pw->base < pw->limit);
161 * XXX: If RF_ACTIVE did not also imply allocating a bus space tag and
162 * handle for the resource, we could pass RF_ACTIVE up to the PCI bus
163 * when allocating the resource windows and rely on the PCI bus driver
167 pcib_activate_window(struct pcib_softc *sc, int type)
170 PCI_ENABLE_IO(device_get_parent(sc->dev), sc->dev, type);
174 pcib_write_windows(struct pcib_softc *sc, int mask)
180 if (sc->io.valid && mask & WIN_IO) {
181 val = pci_read_config(dev, PCIR_IOBASEL_1, 1);
182 if ((val & PCIM_BRIO_MASK) == PCIM_BRIO_32) {
183 pci_write_config(dev, PCIR_IOBASEH_1,
184 sc->io.base >> 16, 2);
185 pci_write_config(dev, PCIR_IOLIMITH_1,
186 sc->io.limit >> 16, 2);
188 pci_write_config(dev, PCIR_IOBASEL_1, sc->io.base >> 8, 1);
189 pci_write_config(dev, PCIR_IOLIMITL_1, sc->io.limit >> 8, 1);
192 if (mask & WIN_MEM) {
193 pci_write_config(dev, PCIR_MEMBASE_1, sc->mem.base >> 16, 2);
194 pci_write_config(dev, PCIR_MEMLIMIT_1, sc->mem.limit >> 16, 2);
197 if (sc->pmem.valid && mask & WIN_PMEM) {
198 val = pci_read_config(dev, PCIR_PMBASEL_1, 2);
199 if ((val & PCIM_BRPM_MASK) == PCIM_BRPM_64) {
200 pci_write_config(dev, PCIR_PMBASEH_1,
201 sc->pmem.base >> 32, 4);
202 pci_write_config(dev, PCIR_PMLIMITH_1,
203 sc->pmem.limit >> 32, 4);
205 pci_write_config(dev, PCIR_PMBASEL_1, sc->pmem.base >> 16, 2);
206 pci_write_config(dev, PCIR_PMLIMITL_1, sc->pmem.limit >> 16, 2);
211 * This is used to reject I/O port allocations that conflict with an
215 pcib_is_isa_range(struct pcib_softc *sc, u_long start, u_long end, u_long count)
219 if (!(sc->bridgectl & PCIB_BCR_ISA_ENABLE))
222 /* Only check fixed ranges for overlap. */
223 if (start + count - 1 != end)
226 /* ISA aliases are only in the lower 64KB of I/O space. */
230 /* Check for overlap with 0x000 - 0x0ff as a special case. */
235 * If the start address is an alias, the range is an alias.
236 * Otherwise, compute the start of the next alias range and
237 * check if it is before the end of the candidate range.
239 if ((start & 0x300) != 0)
241 next_alias = (start & ~0x3fful) | 0x100;
242 if (next_alias <= end)
248 device_printf(sc->dev,
249 "I/O range %#lx-%#lx overlaps with an ISA alias\n", start,
255 pcib_add_window_resources(struct pcib_window *w, struct resource **res,
258 struct resource **newarray;
261 newarray = malloc(sizeof(struct resource *) * (w->count + count),
264 bcopy(w->res, newarray, sizeof(struct resource *) * w->count);
265 bcopy(res, newarray + w->count, sizeof(struct resource *) * count);
266 free(w->res, M_DEVBUF);
270 for (i = 0; i < count; i++) {
271 error = rman_manage_region(&w->rman, rman_get_start(res[i]),
272 rman_get_end(res[i]));
274 panic("Failed to add resource to rman");
278 typedef void (nonisa_callback)(u_long start, u_long end, void *arg);
281 pcib_walk_nonisa_ranges(u_long start, u_long end, nonisa_callback *cb,
287 * If start is within an ISA alias range, move up to the start
288 * of the next non-alias range. As a special case, addresses
289 * in the range 0x000 - 0x0ff should also be skipped since
290 * those are used for various system I/O devices in ISA
293 if (start <= 65535) {
294 if (start < 0x100 || (start & 0x300) != 0) {
300 /* ISA aliases are only in the lower 64KB of I/O space. */
301 while (start <= MIN(end, 65535)) {
302 next_end = MIN(start | 0xff, end);
303 cb(start, next_end, arg);
312 count_ranges(u_long start, u_long end, void *arg)
321 struct resource **res;
322 struct pcib_softc *sc;
327 alloc_ranges(u_long start, u_long end, void *arg)
329 struct alloc_state *as;
330 struct pcib_window *w;
340 device_printf(as->sc->dev,
341 "allocating non-ISA range %#lx-%#lx\n", start, end);
342 as->res[as->count] = bus_alloc_resource(as->sc->dev, SYS_RES_IOPORT,
343 &rid, start, end, end - start + 1, 0);
344 if (as->res[as->count] == NULL)
351 pcib_alloc_nonisa_ranges(struct pcib_softc *sc, u_long start, u_long end)
353 struct alloc_state as;
356 /* First, see how many ranges we need. */
358 pcib_walk_nonisa_ranges(start, end, count_ranges, &new_count);
360 /* Second, allocate the ranges. */
361 as.res = malloc(sizeof(struct resource *) * new_count, M_DEVBUF,
366 pcib_walk_nonisa_ranges(start, end, alloc_ranges, &as);
368 for (i = 0; i < as.count; i++)
369 bus_release_resource(sc->dev, SYS_RES_IOPORT,
370 sc->io.reg, as.res[i]);
371 free(as.res, M_DEVBUF);
374 KASSERT(as.count == new_count, ("%s: count mismatch", __func__));
376 /* Third, add the ranges to the window. */
377 pcib_add_window_resources(&sc->io, as.res, as.count);
378 free(as.res, M_DEVBUF);
383 pcib_alloc_window(struct pcib_softc *sc, struct pcib_window *w, int type,
384 int flags, pci_addr_t max_address)
386 struct resource *res;
390 if (max_address != (u_long)max_address)
392 w->rman.rm_start = 0;
393 w->rman.rm_end = max_address;
394 w->rman.rm_type = RMAN_ARRAY;
395 snprintf(buf, sizeof(buf), "%s %s window",
396 device_get_nameunit(sc->dev), w->name);
397 w->rman.rm_descr = strdup(buf, M_DEVBUF);
398 error = rman_init(&w->rman);
400 panic("Failed to initialize %s %s rman",
401 device_get_nameunit(sc->dev), w->name);
403 if (!pcib_is_window_open(w))
406 if (w->base > max_address || w->limit > max_address) {
407 device_printf(sc->dev,
408 "initial %s window has too many bits, ignoring\n", w->name);
411 if (type == SYS_RES_IOPORT && sc->bridgectl & PCIB_BCR_ISA_ENABLE)
412 (void)pcib_alloc_nonisa_ranges(sc, w->base, w->limit);
415 res = bus_alloc_resource(sc->dev, type, &rid, w->base, w->limit,
416 w->limit - w->base + 1, flags);
418 pcib_add_window_resources(w, &res, 1);
420 if (w->res == NULL) {
421 device_printf(sc->dev,
422 "failed to allocate initial %s window: %#jx-%#jx\n",
423 w->name, (uintmax_t)w->base, (uintmax_t)w->limit);
424 w->base = max_address;
426 pcib_write_windows(sc, w->mask);
429 pcib_activate_window(sc, type);
433 * Initialize I/O windows.
436 pcib_probe_windows(struct pcib_softc *sc)
444 if (pci_clear_pcib) {
445 pcib_bridge_init(dev);
448 /* Determine if the I/O port window is implemented. */
449 val = pci_read_config(dev, PCIR_IOBASEL_1, 1);
452 * If 'val' is zero, then only 16-bits of I/O space
455 pci_write_config(dev, PCIR_IOBASEL_1, 0xff, 1);
456 if (pci_read_config(dev, PCIR_IOBASEL_1, 1) != 0) {
458 pci_write_config(dev, PCIR_IOBASEL_1, 0, 1);
463 /* Read the existing I/O port window. */
465 sc->io.reg = PCIR_IOBASEL_1;
467 sc->io.mask = WIN_IO;
468 sc->io.name = "I/O port";
469 if ((val & PCIM_BRIO_MASK) == PCIM_BRIO_32) {
470 sc->io.base = PCI_PPBIOBASE(
471 pci_read_config(dev, PCIR_IOBASEH_1, 2), val);
472 sc->io.limit = PCI_PPBIOLIMIT(
473 pci_read_config(dev, PCIR_IOLIMITH_1, 2),
474 pci_read_config(dev, PCIR_IOLIMITL_1, 1));
477 sc->io.base = PCI_PPBIOBASE(0, val);
478 sc->io.limit = PCI_PPBIOLIMIT(0,
479 pci_read_config(dev, PCIR_IOLIMITL_1, 1));
482 pcib_alloc_window(sc, &sc->io, SYS_RES_IOPORT, 0, max);
485 /* Read the existing memory window. */
487 sc->mem.reg = PCIR_MEMBASE_1;
489 sc->mem.mask = WIN_MEM;
490 sc->mem.name = "memory";
491 sc->mem.base = PCI_PPBMEMBASE(0,
492 pci_read_config(dev, PCIR_MEMBASE_1, 2));
493 sc->mem.limit = PCI_PPBMEMLIMIT(0,
494 pci_read_config(dev, PCIR_MEMLIMIT_1, 2));
495 pcib_alloc_window(sc, &sc->mem, SYS_RES_MEMORY, 0, 0xffffffff);
497 /* Determine if the prefetchable memory window is implemented. */
498 val = pci_read_config(dev, PCIR_PMBASEL_1, 2);
501 * If 'val' is zero, then only 32-bits of memory space
504 pci_write_config(dev, PCIR_PMBASEL_1, 0xffff, 2);
505 if (pci_read_config(dev, PCIR_PMBASEL_1, 2) != 0) {
507 pci_write_config(dev, PCIR_PMBASEL_1, 0, 2);
512 /* Read the existing prefetchable memory window. */
513 if (sc->pmem.valid) {
514 sc->pmem.reg = PCIR_PMBASEL_1;
516 sc->pmem.mask = WIN_PMEM;
517 sc->pmem.name = "prefetch";
518 if ((val & PCIM_BRPM_MASK) == PCIM_BRPM_64) {
519 sc->pmem.base = PCI_PPBMEMBASE(
520 pci_read_config(dev, PCIR_PMBASEH_1, 4), val);
521 sc->pmem.limit = PCI_PPBMEMLIMIT(
522 pci_read_config(dev, PCIR_PMLIMITH_1, 4),
523 pci_read_config(dev, PCIR_PMLIMITL_1, 2));
524 max = 0xffffffffffffffff;
526 sc->pmem.base = PCI_PPBMEMBASE(0, val);
527 sc->pmem.limit = PCI_PPBMEMLIMIT(0,
528 pci_read_config(dev, PCIR_PMLIMITL_1, 2));
531 pcib_alloc_window(sc, &sc->pmem, SYS_RES_MEMORY,
532 RF_PREFETCHABLE, max);
538 * Allocate a suitable secondary bus for this bridge if needed and
539 * initialize the resource manager for the secondary bus range. Note
540 * that the minimum count is a desired value and this may allocate a
544 pcib_setup_secbus(device_t dev, struct pcib_secbus *bus, int min_count)
547 int error, rid, sec_reg;
549 switch (pci_read_config(dev, PCIR_HDRTYPE, 1) & PCIM_HDRTYPE) {
550 case PCIM_HDRTYPE_BRIDGE:
551 sec_reg = PCIR_SECBUS_1;
552 bus->sub_reg = PCIR_SUBBUS_1;
554 case PCIM_HDRTYPE_CARDBUS:
555 sec_reg = PCIR_SECBUS_2;
556 bus->sub_reg = PCIR_SUBBUS_2;
559 panic("not a PCI bridge");
561 bus->sec = pci_read_config(dev, sec_reg, 1);
562 bus->sub = pci_read_config(dev, bus->sub_reg, 1);
564 bus->rman.rm_start = 0;
565 bus->rman.rm_end = PCI_BUSMAX;
566 bus->rman.rm_type = RMAN_ARRAY;
567 snprintf(buf, sizeof(buf), "%s bus numbers", device_get_nameunit(dev));
568 bus->rman.rm_descr = strdup(buf, M_DEVBUF);
569 error = rman_init(&bus->rman);
571 panic("Failed to initialize %s bus number rman",
572 device_get_nameunit(dev));
575 * Allocate a bus range. This will return an existing bus range
576 * if one exists, or a new bus range if one does not.
579 bus->res = bus_alloc_resource(dev, PCI_RES_BUS, &rid, 0ul, ~0ul,
581 if (bus->res == NULL) {
583 * Fall back to just allocating a range of a single bus
586 bus->res = bus_alloc_resource(dev, PCI_RES_BUS, &rid, 0ul, ~0ul,
588 } else if (rman_get_size(bus->res) < min_count)
590 * Attempt to grow the existing range to satisfy the
591 * minimum desired count.
593 (void)bus_adjust_resource(dev, PCI_RES_BUS, bus->res,
594 rman_get_start(bus->res), rman_get_start(bus->res) +
598 * Add the initial resource to the rman.
600 if (bus->res != NULL) {
601 error = rman_manage_region(&bus->rman, rman_get_start(bus->res),
602 rman_get_end(bus->res));
604 panic("Failed to add resource to rman");
605 bus->sec = rman_get_start(bus->res);
606 bus->sub = rman_get_end(bus->res);
610 static struct resource *
611 pcib_suballoc_bus(struct pcib_secbus *bus, device_t child, int *rid,
612 u_long start, u_long end, u_long count, u_int flags)
614 struct resource *res;
616 res = rman_reserve_resource(&bus->rman, start, end, count, flags,
622 device_printf(bus->dev,
623 "allocated bus range (%lu-%lu) for rid %d of %s\n",
624 rman_get_start(res), rman_get_end(res), *rid,
625 pcib_child_name(child));
626 rman_set_rid(res, *rid);
631 * Attempt to grow the secondary bus range. This is much simpler than
632 * for I/O windows as the range can only be grown by increasing
636 pcib_grow_subbus(struct pcib_secbus *bus, u_long new_end)
641 old_end = rman_get_end(bus->res);
642 KASSERT(new_end > old_end, ("attempt to shrink subbus"));
643 error = bus_adjust_resource(bus->dev, PCI_RES_BUS, bus->res,
644 rman_get_start(bus->res), new_end);
648 device_printf(bus->dev, "grew bus range to %lu-%lu\n",
649 rman_get_start(bus->res), rman_get_end(bus->res));
650 error = rman_manage_region(&bus->rman, old_end + 1,
651 rman_get_end(bus->res));
653 panic("Failed to add resource to rman");
654 bus->sub = rman_get_end(bus->res);
655 pci_write_config(bus->dev, bus->sub_reg, bus->sub, 1);
660 pcib_alloc_subbus(struct pcib_secbus *bus, device_t child, int *rid,
661 u_long start, u_long end, u_long count, u_int flags)
663 struct resource *res;
664 u_long start_free, end_free, new_end;
667 * First, see if the request can be satisified by the existing
670 res = pcib_suballoc_bus(bus, child, rid, start, end, count, flags);
675 * Figure out a range to grow the bus range. First, find the
676 * first bus number after the last allocated bus in the rman and
677 * enforce that as a minimum starting point for the range.
679 if (rman_last_free_region(&bus->rman, &start_free, &end_free) != 0 ||
680 end_free != bus->sub)
681 start_free = bus->sub + 1;
682 if (start_free < start)
684 new_end = start_free + count - 1;
687 * See if this new range would satisfy the request if it
693 /* Finally, attempt to grow the existing resource. */
695 device_printf(bus->dev,
696 "attempting to grow bus range for %lu buses\n", count);
697 printf("\tback candidate range: %lu-%lu\n", start_free,
700 if (pcib_grow_subbus(bus, new_end) == 0)
701 return (pcib_suballoc_bus(bus, child, rid, start, end, count,
710 * Is the prefetch window open (eg, can we allocate memory in it?)
713 pcib_is_prefetch_open(struct pcib_softc *sc)
715 return (sc->pmembase > 0 && sc->pmembase < sc->pmemlimit);
719 * Is the nonprefetch window open (eg, can we allocate memory in it?)
722 pcib_is_nonprefetch_open(struct pcib_softc *sc)
724 return (sc->membase > 0 && sc->membase < sc->memlimit);
728 * Is the io window open (eg, can we allocate ports in it?)
731 pcib_is_io_open(struct pcib_softc *sc)
733 return (sc->iobase > 0 && sc->iobase < sc->iolimit);
737 * Get current I/O decode.
740 pcib_get_io_decode(struct pcib_softc *sc)
747 iolow = pci_read_config(dev, PCIR_IOBASEL_1, 1);
748 if ((iolow & PCIM_BRIO_MASK) == PCIM_BRIO_32)
749 sc->iobase = PCI_PPBIOBASE(
750 pci_read_config(dev, PCIR_IOBASEH_1, 2), iolow);
752 sc->iobase = PCI_PPBIOBASE(0, iolow);
754 iolow = pci_read_config(dev, PCIR_IOLIMITL_1, 1);
755 if ((iolow & PCIM_BRIO_MASK) == PCIM_BRIO_32)
756 sc->iolimit = PCI_PPBIOLIMIT(
757 pci_read_config(dev, PCIR_IOLIMITH_1, 2), iolow);
759 sc->iolimit = PCI_PPBIOLIMIT(0, iolow);
763 * Get current memory decode.
766 pcib_get_mem_decode(struct pcib_softc *sc)
773 sc->membase = PCI_PPBMEMBASE(0,
774 pci_read_config(dev, PCIR_MEMBASE_1, 2));
775 sc->memlimit = PCI_PPBMEMLIMIT(0,
776 pci_read_config(dev, PCIR_MEMLIMIT_1, 2));
778 pmemlow = pci_read_config(dev, PCIR_PMBASEL_1, 2);
779 if ((pmemlow & PCIM_BRPM_MASK) == PCIM_BRPM_64)
780 sc->pmembase = PCI_PPBMEMBASE(
781 pci_read_config(dev, PCIR_PMBASEH_1, 4), pmemlow);
783 sc->pmembase = PCI_PPBMEMBASE(0, pmemlow);
785 pmemlow = pci_read_config(dev, PCIR_PMLIMITL_1, 2);
786 if ((pmemlow & PCIM_BRPM_MASK) == PCIM_BRPM_64)
787 sc->pmemlimit = PCI_PPBMEMLIMIT(
788 pci_read_config(dev, PCIR_PMLIMITH_1, 4), pmemlow);
790 sc->pmemlimit = PCI_PPBMEMLIMIT(0, pmemlow);
794 * Restore previous I/O decode.
797 pcib_set_io_decode(struct pcib_softc *sc)
804 iohi = sc->iobase >> 16;
806 pci_write_config(dev, PCIR_IOBASEH_1, iohi, 2);
807 pci_write_config(dev, PCIR_IOBASEL_1, sc->iobase >> 8, 1);
809 iohi = sc->iolimit >> 16;
811 pci_write_config(dev, PCIR_IOLIMITH_1, iohi, 2);
812 pci_write_config(dev, PCIR_IOLIMITL_1, sc->iolimit >> 8, 1);
816 * Restore previous memory decode.
819 pcib_set_mem_decode(struct pcib_softc *sc)
826 pci_write_config(dev, PCIR_MEMBASE_1, sc->membase >> 16, 2);
827 pci_write_config(dev, PCIR_MEMLIMIT_1, sc->memlimit >> 16, 2);
829 pmemhi = sc->pmembase >> 32;
831 pci_write_config(dev, PCIR_PMBASEH_1, pmemhi, 4);
832 pci_write_config(dev, PCIR_PMBASEL_1, sc->pmembase >> 16, 2);
834 pmemhi = sc->pmemlimit >> 32;
836 pci_write_config(dev, PCIR_PMLIMITH_1, pmemhi, 4);
837 pci_write_config(dev, PCIR_PMLIMITL_1, sc->pmemlimit >> 16, 2);
842 * Get current bridge configuration.
845 pcib_cfg_save(struct pcib_softc *sc)
853 command = pci_read_config(dev, PCIR_COMMAND, 2);
854 if (command & PCIM_CMD_PORTEN)
855 pcib_get_io_decode(sc);
856 if (command & PCIM_CMD_MEMEN)
857 pcib_get_mem_decode(sc);
862 * Restore previous bridge configuration.
865 pcib_cfg_restore(struct pcib_softc *sc)
874 pcib_write_windows(sc, WIN_IO | WIN_MEM | WIN_PMEM);
876 command = pci_read_config(dev, PCIR_COMMAND, 2);
877 if (command & PCIM_CMD_PORTEN)
878 pcib_set_io_decode(sc);
879 if (command & PCIM_CMD_MEMEN)
880 pcib_set_mem_decode(sc);
885 * Generic device interface
888 pcib_probe(device_t dev)
890 if ((pci_get_class(dev) == PCIC_BRIDGE) &&
891 (pci_get_subclass(dev) == PCIS_BRIDGE_PCI)) {
892 device_set_desc(dev, "PCI-PCI bridge");
899 pcib_attach_common(device_t dev)
901 struct pcib_softc *sc;
902 struct sysctl_ctx_list *sctx;
903 struct sysctl_oid *soid;
906 sc = device_get_softc(dev);
910 * Get current bridge configuration.
912 sc->domain = pci_get_domain(dev);
913 #if !(defined(NEW_PCIB) && defined(PCI_RES_BUS))
914 sc->bus.sec = pci_read_config(dev, PCIR_SECBUS_1, 1);
915 sc->bus.sub = pci_read_config(dev, PCIR_SUBBUS_1, 1);
917 sc->bridgectl = pci_read_config(dev, PCIR_BRIDGECTL_1, 2);
921 * The primary bus register should always be the bus of the
924 sc->pribus = pci_get_bus(dev);
925 pci_write_config(dev, PCIR_PRIBUS_1, sc->pribus, 1);
928 * Setup sysctl reporting nodes
930 sctx = device_get_sysctl_ctx(dev);
931 soid = device_get_sysctl_tree(dev);
932 SYSCTL_ADD_UINT(sctx, SYSCTL_CHILDREN(soid), OID_AUTO, "domain",
933 CTLFLAG_RD, &sc->domain, 0, "Domain number");
934 SYSCTL_ADD_UINT(sctx, SYSCTL_CHILDREN(soid), OID_AUTO, "pribus",
935 CTLFLAG_RD, &sc->pribus, 0, "Primary bus number");
936 SYSCTL_ADD_UINT(sctx, SYSCTL_CHILDREN(soid), OID_AUTO, "secbus",
937 CTLFLAG_RD, &sc->bus.sec, 0, "Secondary bus number");
938 SYSCTL_ADD_UINT(sctx, SYSCTL_CHILDREN(soid), OID_AUTO, "subbus",
939 CTLFLAG_RD, &sc->bus.sub, 0, "Subordinate bus number");
944 switch (pci_get_devid(dev)) {
945 #if !(defined(NEW_PCIB) && defined(PCI_RES_BUS))
946 case 0x12258086: /* Intel 82454KX/GX (Orion) */
950 supbus = pci_read_config(dev, 0x41, 1);
951 if (supbus != 0xff) {
952 sc->bus.sec = supbus + 1;
953 sc->bus.sub = supbus + 1;
960 * The i82380FB mobile docking controller is a PCI-PCI bridge,
961 * and it is a subtractive bridge. However, the ProgIf is wrong
962 * so the normal setting of PCIB_SUBTRACTIVE bit doesn't
963 * happen. There's also a Toshiba bridge that behaves this
966 case 0x124b8086: /* Intel 82380FB Mobile */
967 case 0x060513d7: /* Toshiba ???? */
968 sc->flags |= PCIB_SUBTRACTIVE;
971 #if !(defined(NEW_PCIB) && defined(PCI_RES_BUS))
972 /* Compaq R3000 BIOS sets wrong subordinate bus number. */
977 if ((cp = kern_getenv("smbios.planar.maker")) == NULL)
979 if (strncmp(cp, "Compal", 6) != 0) {
984 if ((cp = kern_getenv("smbios.planar.product")) == NULL)
986 if (strncmp(cp, "08A0", 4) != 0) {
991 if (sc->bus.sub < 0xa) {
992 pci_write_config(dev, PCIR_SUBBUS_1, 0xa, 1);
993 sc->bus.sub = pci_read_config(dev, PCIR_SUBBUS_1, 1);
1000 if (pci_msi_device_blacklisted(dev))
1001 sc->flags |= PCIB_DISABLE_MSI;
1003 if (pci_msix_device_blacklisted(dev))
1004 sc->flags |= PCIB_DISABLE_MSIX;
1007 * Intel 815, 845 and other chipsets say they are PCI-PCI bridges,
1008 * but have a ProgIF of 0x80. The 82801 family (AA, AB, BAM/CAM,
1009 * BA/CA/DB and E) PCI bridges are HUB-PCI bridges, in Intelese.
1010 * This means they act as if they were subtractively decoding
1011 * bridges and pass all transactions. Mark them and real ProgIf 1
1012 * parts as subtractive.
1014 if ((pci_get_devid(dev) & 0xff00ffff) == 0x24008086 ||
1015 pci_read_config(dev, PCIR_PROGIF, 1) == PCIP_BRIDGE_PCI_SUBTRACTIVE)
1016 sc->flags |= PCIB_SUBTRACTIVE;
1020 pcib_setup_secbus(dev, &sc->bus, 1);
1022 pcib_probe_windows(sc);
1025 device_printf(dev, " domain %d\n", sc->domain);
1026 device_printf(dev, " secondary bus %d\n", sc->bus.sec);
1027 device_printf(dev, " subordinate bus %d\n", sc->bus.sub);
1029 if (pcib_is_window_open(&sc->io))
1030 device_printf(dev, " I/O decode 0x%jx-0x%jx\n",
1031 (uintmax_t)sc->io.base, (uintmax_t)sc->io.limit);
1032 if (pcib_is_window_open(&sc->mem))
1033 device_printf(dev, " memory decode 0x%jx-0x%jx\n",
1034 (uintmax_t)sc->mem.base, (uintmax_t)sc->mem.limit);
1035 if (pcib_is_window_open(&sc->pmem))
1036 device_printf(dev, " prefetched decode 0x%jx-0x%jx\n",
1037 (uintmax_t)sc->pmem.base, (uintmax_t)sc->pmem.limit);
1039 if (pcib_is_io_open(sc))
1040 device_printf(dev, " I/O decode 0x%x-0x%x\n",
1041 sc->iobase, sc->iolimit);
1042 if (pcib_is_nonprefetch_open(sc))
1043 device_printf(dev, " memory decode 0x%jx-0x%jx\n",
1044 (uintmax_t)sc->membase, (uintmax_t)sc->memlimit);
1045 if (pcib_is_prefetch_open(sc))
1046 device_printf(dev, " prefetched decode 0x%jx-0x%jx\n",
1047 (uintmax_t)sc->pmembase, (uintmax_t)sc->pmemlimit);
1049 if (sc->bridgectl & (PCIB_BCR_ISA_ENABLE | PCIB_BCR_VGA_ENABLE) ||
1050 sc->flags & PCIB_SUBTRACTIVE) {
1051 device_printf(dev, " special decode ");
1053 if (sc->bridgectl & PCIB_BCR_ISA_ENABLE) {
1057 if (sc->bridgectl & PCIB_BCR_VGA_ENABLE) {
1058 printf("%sVGA", comma ? ", " : "");
1061 if (sc->flags & PCIB_SUBTRACTIVE)
1062 printf("%ssubtractive", comma ? ", " : "");
1068 * Always enable busmastering on bridges so that transactions
1069 * initiated on the secondary bus are passed through to the
1072 pci_enable_busmaster(dev);
1076 pcib_attach(device_t dev)
1078 struct pcib_softc *sc;
1081 pcib_attach_common(dev);
1082 sc = device_get_softc(dev);
1083 if (sc->bus.sec != 0) {
1084 child = device_add_child(dev, "pci", sc->bus.sec);
1086 return(bus_generic_attach(dev));
1089 /* no secondary bus; we should have fixed this */
1094 pcib_suspend(device_t dev)
1097 pcib_cfg_save(device_get_softc(dev));
1098 return (bus_generic_suspend(dev));
1102 pcib_resume(device_t dev)
1105 pcib_cfg_restore(device_get_softc(dev));
1106 return (bus_generic_resume(dev));
1110 pcib_bridge_init(device_t dev)
1112 pci_write_config(dev, PCIR_IOBASEL_1, 0xff, 1);
1113 pci_write_config(dev, PCIR_IOBASEH_1, 0xffff, 2);
1114 pci_write_config(dev, PCIR_IOLIMITL_1, 0, 1);
1115 pci_write_config(dev, PCIR_IOLIMITH_1, 0, 2);
1116 pci_write_config(dev, PCIR_MEMBASE_1, 0xffff, 2);
1117 pci_write_config(dev, PCIR_MEMLIMIT_1, 0, 2);
1118 pci_write_config(dev, PCIR_PMBASEL_1, 0xffff, 2);
1119 pci_write_config(dev, PCIR_PMBASEH_1, 0xffffffff, 4);
1120 pci_write_config(dev, PCIR_PMLIMITL_1, 0, 2);
1121 pci_write_config(dev, PCIR_PMLIMITH_1, 0, 4);
1125 pcib_read_ivar(device_t dev, device_t child, int which, uintptr_t *result)
1127 struct pcib_softc *sc = device_get_softc(dev);
1130 case PCIB_IVAR_DOMAIN:
1131 *result = sc->domain;
1134 *result = sc->bus.sec;
1141 pcib_write_ivar(device_t dev, device_t child, int which, uintptr_t value)
1145 case PCIB_IVAR_DOMAIN:
1155 * Attempt to allocate a resource from the existing resources assigned
1158 static struct resource *
1159 pcib_suballoc_resource(struct pcib_softc *sc, struct pcib_window *w,
1160 device_t child, int type, int *rid, u_long start, u_long end, u_long count,
1163 struct resource *res;
1165 if (!pcib_is_window_open(w))
1168 res = rman_reserve_resource(&w->rman, start, end, count,
1169 flags & ~RF_ACTIVE, child);
1174 device_printf(sc->dev,
1175 "allocated %s range (%#lx-%#lx) for rid %x of %s\n",
1176 w->name, rman_get_start(res), rman_get_end(res), *rid,
1177 pcib_child_name(child));
1178 rman_set_rid(res, *rid);
1181 * If the resource should be active, pass that request up the
1182 * tree. This assumes the parent drivers can handle
1183 * activating sub-allocated resources.
1185 if (flags & RF_ACTIVE) {
1186 if (bus_activate_resource(child, type, *rid, res) != 0) {
1187 rman_release_resource(res);
1195 /* Allocate a fresh resource range for an unconfigured window. */
1197 pcib_alloc_new_window(struct pcib_softc *sc, struct pcib_window *w, int type,
1198 u_long start, u_long end, u_long count, u_int flags)
1200 struct resource *res;
1201 u_long base, limit, wmask;
1205 * If this is an I/O window on a bridge with ISA enable set
1206 * and the start address is below 64k, then try to allocate an
1207 * initial window of 0x1000 bytes long starting at address
1208 * 0xf000 and walking down. Note that if the original request
1209 * was larger than the non-aliased range size of 0x100 our
1210 * caller would have raised the start address up to 64k
1213 if (type == SYS_RES_IOPORT && sc->bridgectl & PCIB_BCR_ISA_ENABLE &&
1215 for (base = 0xf000; (long)base >= 0; base -= 0x1000) {
1216 limit = base + 0xfff;
1219 * Skip ranges that wouldn't work for the
1220 * original request. Note that the actual
1221 * window that overlaps are the non-alias
1222 * ranges within [base, limit], so this isn't
1223 * quite a simple comparison.
1225 if (start + count > limit - 0x400)
1229 * The first open region for the window at
1232 if (end - count + 1 < 0x400)
1235 if (end - count + 1 < base)
1239 if (pcib_alloc_nonisa_ranges(sc, base, limit) == 0) {
1248 wmask = (1ul << w->step) - 1;
1249 if (RF_ALIGNMENT(flags) < w->step) {
1250 flags &= ~RF_ALIGNMENT_MASK;
1251 flags |= RF_ALIGNMENT_LOG2(w->step);
1255 count = roundup2(count, 1ul << w->step);
1257 res = bus_alloc_resource(sc->dev, type, &rid, start, end, count,
1258 flags & ~RF_ACTIVE);
1261 pcib_add_window_resources(w, &res, 1);
1262 pcib_activate_window(sc, type);
1263 w->base = rman_get_start(res);
1264 w->limit = rman_get_end(res);
1268 /* Try to expand an existing window to the requested base and limit. */
1270 pcib_expand_window(struct pcib_softc *sc, struct pcib_window *w, int type,
1271 u_long base, u_long limit)
1273 struct resource *res;
1274 int error, i, force_64k_base;
1276 KASSERT(base <= w->base && limit >= w->limit,
1277 ("attempting to shrink window"));
1280 * XXX: pcib_grow_window() doesn't try to do this anyway and
1281 * the error handling for all the edge cases would be tedious.
1283 KASSERT(limit == w->limit || base == w->base,
1284 ("attempting to grow both ends of a window"));
1287 * Yet more special handling for requests to expand an I/O
1288 * window behind an ISA-enabled bridge. Since I/O windows
1289 * have to grow in 0x1000 increments and the end of the 0xffff
1290 * range is an alias, growing a window below 64k will always
1291 * result in allocating new resources and never adjusting an
1292 * existing resource.
1294 if (type == SYS_RES_IOPORT && sc->bridgectl & PCIB_BCR_ISA_ENABLE &&
1295 (limit <= 65535 || (base <= 65535 && base != w->base))) {
1296 KASSERT(limit == w->limit || limit <= 65535,
1297 ("attempting to grow both ends across 64k ISA alias"));
1299 if (base != w->base)
1300 error = pcib_alloc_nonisa_ranges(sc, base, w->base - 1);
1302 error = pcib_alloc_nonisa_ranges(sc, w->limit + 1,
1312 * Find the existing resource to adjust. Usually there is only one,
1313 * but for an ISA-enabled bridge we might be growing the I/O window
1314 * above 64k and need to find the existing resource that maps all
1315 * of the area above 64k.
1317 for (i = 0; i < w->count; i++) {
1318 if (rman_get_end(w->res[i]) == w->limit)
1321 KASSERT(i != w->count, ("did not find existing resource"));
1325 * Usually the resource we found should match the window's
1326 * existing range. The one exception is the ISA-enabled case
1327 * mentioned above in which case the resource should start at
1330 if (type == SYS_RES_IOPORT && sc->bridgectl & PCIB_BCR_ISA_ENABLE &&
1332 KASSERT(rman_get_start(res) == 65536,
1333 ("existing resource mismatch"));
1336 KASSERT(w->base == rman_get_start(res),
1337 ("existing resource mismatch"));
1341 error = bus_adjust_resource(sc->dev, type, res, force_64k_base ?
1342 rman_get_start(res) : base, limit);
1346 /* Add the newly allocated region to the resource manager. */
1347 if (w->base != base) {
1348 error = rman_manage_region(&w->rman, base, w->base - 1);
1351 error = rman_manage_region(&w->rman, w->limit + 1, limit);
1356 device_printf(sc->dev,
1357 "failed to expand %s resource manager\n", w->name);
1358 (void)bus_adjust_resource(sc->dev, type, res, force_64k_base ?
1359 rman_get_start(res) : w->base, w->limit);
1365 * Attempt to grow a window to make room for a given resource request.
1368 pcib_grow_window(struct pcib_softc *sc, struct pcib_window *w, int type,
1369 u_long start, u_long end, u_long count, u_int flags)
1371 u_long align, start_free, end_free, front, back, wmask;
1375 * Clamp the desired resource range to the maximum address
1376 * this window supports. Reject impossible requests.
1378 * For I/O port requests behind a bridge with the ISA enable
1379 * bit set, force large allocations to start above 64k.
1383 if (sc->bridgectl & PCIB_BCR_ISA_ENABLE && count > 0x100 &&
1386 if (end > w->rman.rm_end)
1387 end = w->rman.rm_end;
1388 if (start + count - 1 > end || start + count < start)
1390 wmask = (1ul << w->step) - 1;
1393 * If there is no resource at all, just try to allocate enough
1394 * aligned space for this resource.
1396 if (w->res == NULL) {
1397 error = pcib_alloc_new_window(sc, w, type, start, end, count,
1401 device_printf(sc->dev,
1402 "failed to allocate initial %s window (%#lx-%#lx,%#lx)\n",
1403 w->name, start, end, count);
1407 device_printf(sc->dev,
1408 "allocated initial %s window of %#jx-%#jx\n",
1409 w->name, (uintmax_t)w->base, (uintmax_t)w->limit);
1414 * See if growing the window would help. Compute the minimum
1415 * amount of address space needed on both the front and back
1416 * ends of the existing window to satisfy the allocation.
1418 * For each end, build a candidate region adjusting for the
1419 * required alignment, etc. If there is a free region at the
1420 * edge of the window, grow from the inner edge of the free
1421 * region. Otherwise grow from the window boundary.
1423 * Growing an I/O window below 64k for a bridge with the ISA
1424 * enable bit doesn't require any special magic as the step
1425 * size of an I/O window (1k) always includes multiple
1426 * non-alias ranges when it is grown in either direction.
1428 * XXX: Special case: if w->res is completely empty and the
1429 * request size is larger than w->res, we should find the
1430 * optimal aligned buffer containing w->res and allocate that.
1433 device_printf(sc->dev,
1434 "attempting to grow %s window for (%#lx-%#lx,%#lx)\n",
1435 w->name, start, end, count);
1436 align = 1ul << RF_ALIGNMENT(flags);
1437 if (start < w->base) {
1438 if (rman_first_free_region(&w->rman, &start_free, &end_free) !=
1439 0 || start_free != w->base)
1444 /* Move end_free down until it is properly aligned. */
1445 end_free &= ~(align - 1);
1447 front = end_free - (count - 1);
1450 * The resource would now be allocated at (front,
1451 * end_free). Ensure that fits in the (start, end)
1452 * bounds. end_free is checked above. If 'front' is
1453 * ok, ensure it is properly aligned for this window.
1454 * Also check for underflow.
1456 if (front >= start && front <= end_free) {
1458 printf("\tfront candidate range: %#lx-%#lx\n",
1461 front = w->base - front;
1466 if (end > w->limit) {
1467 if (rman_last_free_region(&w->rman, &start_free, &end_free) !=
1468 0 || end_free != w->limit)
1469 start_free = w->limit + 1;
1470 if (start_free < start)
1473 /* Move start_free up until it is properly aligned. */
1474 start_free = roundup2(start_free, align);
1475 back = start_free + count - 1;
1478 * The resource would now be allocated at (start_free,
1479 * back). Ensure that fits in the (start, end)
1480 * bounds. start_free is checked above. If 'back' is
1481 * ok, ensure it is properly aligned for this window.
1482 * Also check for overflow.
1484 if (back <= end && start_free <= back) {
1486 printf("\tback candidate range: %#lx-%#lx\n",
1496 * Try to allocate the smallest needed region first.
1497 * If that fails, fall back to the other region.
1500 while (front != 0 || back != 0) {
1501 if (front != 0 && (front <= back || back == 0)) {
1502 error = pcib_expand_window(sc, w, type, w->base - front,
1508 error = pcib_expand_window(sc, w, type, w->base,
1519 device_printf(sc->dev, "grew %s window to %#jx-%#jx\n",
1520 w->name, (uintmax_t)w->base, (uintmax_t)w->limit);
1523 /* Write the new window. */
1524 KASSERT((w->base & wmask) == 0, ("start address is not aligned"));
1525 KASSERT((w->limit & wmask) == wmask, ("end address is not aligned"));
1526 pcib_write_windows(sc, w->mask);
1531 * We have to trap resource allocation requests and ensure that the bridge
1532 * is set up to, or capable of handling them.
1535 pcib_alloc_resource(device_t dev, device_t child, int type, int *rid,
1536 u_long start, u_long end, u_long count, u_int flags)
1538 struct pcib_softc *sc;
1541 sc = device_get_softc(dev);
1544 * VGA resources are decoded iff the VGA enable bit is set in
1545 * the bridge control register. VGA resources do not fall into
1546 * the resource windows and are passed up to the parent.
1548 if ((type == SYS_RES_IOPORT && pci_is_vga_ioport_range(start, end)) ||
1549 (type == SYS_RES_MEMORY && pci_is_vga_memory_range(start, end))) {
1550 if (sc->bridgectl & PCIB_BCR_VGA_ENABLE)
1551 return (bus_generic_alloc_resource(dev, child, type,
1552 rid, start, end, count, flags));
1560 return (pcib_alloc_subbus(&sc->bus, child, rid, start, end,
1563 case SYS_RES_IOPORT:
1564 if (pcib_is_isa_range(sc, start, end, count))
1566 r = pcib_suballoc_resource(sc, &sc->io, child, type, rid, start,
1568 if (r != NULL || (sc->flags & PCIB_SUBTRACTIVE) != 0)
1570 if (pcib_grow_window(sc, &sc->io, type, start, end, count,
1572 r = pcib_suballoc_resource(sc, &sc->io, child, type,
1573 rid, start, end, count, flags);
1575 case SYS_RES_MEMORY:
1577 * For prefetchable resources, prefer the prefetchable
1578 * memory window, but fall back to the regular memory
1579 * window if that fails. Try both windows before
1580 * attempting to grow a window in case the firmware
1581 * has used a range in the regular memory window to
1582 * map a prefetchable BAR.
1584 if (flags & RF_PREFETCHABLE) {
1585 r = pcib_suballoc_resource(sc, &sc->pmem, child, type,
1586 rid, start, end, count, flags);
1590 r = pcib_suballoc_resource(sc, &sc->mem, child, type, rid,
1591 start, end, count, flags);
1592 if (r != NULL || (sc->flags & PCIB_SUBTRACTIVE) != 0)
1594 if (flags & RF_PREFETCHABLE) {
1595 if (pcib_grow_window(sc, &sc->pmem, type, start, end,
1596 count, flags) == 0) {
1597 r = pcib_suballoc_resource(sc, &sc->pmem, child,
1598 type, rid, start, end, count, flags);
1603 if (pcib_grow_window(sc, &sc->mem, type, start, end, count,
1604 flags & ~RF_PREFETCHABLE) == 0)
1605 r = pcib_suballoc_resource(sc, &sc->mem, child, type,
1606 rid, start, end, count, flags);
1609 return (bus_generic_alloc_resource(dev, child, type, rid,
1610 start, end, count, flags));
1614 * If attempts to suballocate from the window fail but this is a
1615 * subtractive bridge, pass the request up the tree.
1617 if (sc->flags & PCIB_SUBTRACTIVE && r == NULL)
1618 return (bus_generic_alloc_resource(dev, child, type, rid,
1619 start, end, count, flags));
1624 pcib_adjust_resource(device_t bus, device_t child, int type, struct resource *r,
1625 u_long start, u_long end)
1627 struct pcib_softc *sc;
1629 sc = device_get_softc(bus);
1630 if (pcib_is_resource_managed(sc, type, r))
1631 return (rman_adjust_resource(r, start, end));
1632 return (bus_generic_adjust_resource(bus, child, type, r, start, end));
1636 pcib_release_resource(device_t dev, device_t child, int type, int rid,
1639 struct pcib_softc *sc;
1642 sc = device_get_softc(dev);
1643 if (pcib_is_resource_managed(sc, type, r)) {
1644 if (rman_get_flags(r) & RF_ACTIVE) {
1645 error = bus_deactivate_resource(child, type, rid, r);
1649 return (rman_release_resource(r));
1651 return (bus_generic_release_resource(dev, child, type, rid, r));
1655 * We have to trap resource allocation requests and ensure that the bridge
1656 * is set up to, or capable of handling them.
1659 pcib_alloc_resource(device_t dev, device_t child, int type, int *rid,
1660 u_long start, u_long end, u_long count, u_int flags)
1662 struct pcib_softc *sc = device_get_softc(dev);
1663 const char *name, *suffix;
1667 * Fail the allocation for this range if it's not supported.
1669 name = device_get_nameunit(child);
1676 case SYS_RES_IOPORT:
1678 if (!pcib_is_io_open(sc))
1680 ok = (start >= sc->iobase && end <= sc->iolimit);
1683 * Make sure we allow access to VGA I/O addresses when the
1684 * bridge has the "VGA Enable" bit set.
1686 if (!ok && pci_is_vga_ioport_range(start, end))
1687 ok = (sc->bridgectl & PCIB_BCR_VGA_ENABLE) ? 1 : 0;
1689 if ((sc->flags & PCIB_SUBTRACTIVE) == 0) {
1691 if (start < sc->iobase)
1693 if (end > sc->iolimit)
1702 * If we overlap with the subtractive range, then
1703 * pick the upper range to use.
1705 if (start < sc->iolimit && end > sc->iobase)
1706 start = sc->iolimit + 1;
1710 device_printf(dev, "ioport: end (%lx) < start (%lx)\n",
1717 device_printf(dev, "%s%srequested unsupported I/O "
1718 "range 0x%lx-0x%lx (decoding 0x%x-0x%x)\n",
1719 name, suffix, start, end, sc->iobase, sc->iolimit);
1724 "%s%srequested I/O range 0x%lx-0x%lx: in range\n",
1725 name, suffix, start, end);
1728 case SYS_RES_MEMORY:
1730 if (pcib_is_nonprefetch_open(sc))
1731 ok = ok || (start >= sc->membase && end <= sc->memlimit);
1732 if (pcib_is_prefetch_open(sc))
1733 ok = ok || (start >= sc->pmembase && end <= sc->pmemlimit);
1736 * Make sure we allow access to VGA memory addresses when the
1737 * bridge has the "VGA Enable" bit set.
1739 if (!ok && pci_is_vga_memory_range(start, end))
1740 ok = (sc->bridgectl & PCIB_BCR_VGA_ENABLE) ? 1 : 0;
1742 if ((sc->flags & PCIB_SUBTRACTIVE) == 0) {
1745 if (flags & RF_PREFETCHABLE) {
1746 if (pcib_is_prefetch_open(sc)) {
1747 if (start < sc->pmembase)
1748 start = sc->pmembase;
1749 if (end > sc->pmemlimit)
1750 end = sc->pmemlimit;
1754 } else { /* non-prefetchable */
1755 if (pcib_is_nonprefetch_open(sc)) {
1756 if (start < sc->membase)
1757 start = sc->membase;
1758 if (end > sc->memlimit)
1766 ok = 1; /* subtractive bridge: always ok */
1768 if (pcib_is_nonprefetch_open(sc)) {
1769 if (start < sc->memlimit && end > sc->membase)
1770 start = sc->memlimit + 1;
1772 if (pcib_is_prefetch_open(sc)) {
1773 if (start < sc->pmemlimit && end > sc->pmembase)
1774 start = sc->pmemlimit + 1;
1779 device_printf(dev, "memory: end (%lx) < start (%lx)\n",
1785 if (!ok && bootverbose)
1787 "%s%srequested unsupported memory range %#lx-%#lx "
1788 "(decoding %#jx-%#jx, %#jx-%#jx)\n",
1789 name, suffix, start, end,
1790 (uintmax_t)sc->membase, (uintmax_t)sc->memlimit,
1791 (uintmax_t)sc->pmembase, (uintmax_t)sc->pmemlimit);
1795 device_printf(dev,"%s%srequested memory range "
1796 "0x%lx-0x%lx: good\n",
1797 name, suffix, start, end);
1804 * Bridge is OK decoding this resource, so pass it up.
1806 return (bus_generic_alloc_resource(dev, child, type, rid, start, end,
1812 * If ARI is enabled on this downstream port, translate the function number
1813 * to the non-ARI slot/function. The downstream port will convert it back in
1814 * hardware. If ARI is not enabled slot and func are not modified.
1816 static __inline void
1817 pcib_xlate_ari(device_t pcib, int bus, int *slot, int *func)
1819 struct pcib_softc *sc;
1822 sc = device_get_softc(pcib);
1825 if (sc->flags & PCIB_ENABLE_ARI) {
1827 ("Non-zero slot number with ARI enabled!"));
1828 *slot = PCIE_ARI_SLOT(ari_func);
1829 *func = PCIE_ARI_FUNC(ari_func);
1835 pcib_enable_ari(struct pcib_softc *sc, uint32_t pcie_pos)
1839 ctl2 = pci_read_config(sc->dev, pcie_pos + PCIER_DEVICE_CTL2, 4);
1840 ctl2 |= PCIEM_CTL2_ARI;
1841 pci_write_config(sc->dev, pcie_pos + PCIER_DEVICE_CTL2, ctl2, 4);
1843 sc->flags |= PCIB_ENABLE_ARI;
1850 pcib_maxslots(device_t dev)
1852 return (PCI_SLOTMAX);
1856 pcib_ari_maxslots(device_t dev)
1858 struct pcib_softc *sc;
1860 sc = device_get_softc(dev);
1862 if (sc->flags & PCIB_ENABLE_ARI)
1863 return (PCIE_ARI_SLOTMAX);
1865 return (PCI_SLOTMAX);
1869 pcib_ari_maxfuncs(device_t dev)
1871 struct pcib_softc *sc;
1873 sc = device_get_softc(dev);
1875 if (sc->flags & PCIB_ENABLE_ARI)
1876 return (PCIE_ARI_FUNCMAX);
1878 return (PCI_FUNCMAX);
1882 pcib_ari_decode_rid(device_t pcib, uint16_t rid, int *bus, int *slot,
1885 struct pcib_softc *sc;
1887 sc = device_get_softc(pcib);
1889 *bus = PCI_RID2BUS(rid);
1890 if (sc->flags & PCIB_ENABLE_ARI) {
1891 *slot = PCIE_ARI_RID2SLOT(rid);
1892 *func = PCIE_ARI_RID2FUNC(rid);
1894 *slot = PCI_RID2SLOT(rid);
1895 *func = PCI_RID2FUNC(rid);
1900 * Since we are a child of a PCI bus, its parent must support the pcib interface.
1903 pcib_read_config(device_t dev, u_int b, u_int s, u_int f, u_int reg, int width)
1906 pcib_xlate_ari(dev, b, &s, &f);
1907 return(PCIB_READ_CONFIG(device_get_parent(device_get_parent(dev)), b, s,
1912 pcib_write_config(device_t dev, u_int b, u_int s, u_int f, u_int reg, uint32_t val, int width)
1915 pcib_xlate_ari(dev, b, &s, &f);
1916 PCIB_WRITE_CONFIG(device_get_parent(device_get_parent(dev)), b, s, f,
1921 * Route an interrupt across a PCI bridge.
1924 pcib_route_interrupt(device_t pcib, device_t dev, int pin)
1932 * The PCI standard defines a swizzle of the child-side device/intpin to
1933 * the parent-side intpin as follows.
1935 * device = device on child bus
1936 * child_intpin = intpin on child bus slot (0-3)
1937 * parent_intpin = intpin on parent bus slot (0-3)
1939 * parent_intpin = (device + child_intpin) % 4
1941 parent_intpin = (pci_get_slot(dev) + (pin - 1)) % 4;
1944 * Our parent is a PCI bus. Its parent must export the pcib interface
1945 * which includes the ability to route interrupts.
1947 bus = device_get_parent(pcib);
1948 intnum = PCIB_ROUTE_INTERRUPT(device_get_parent(bus), pcib, parent_intpin + 1);
1949 if (PCI_INTERRUPT_VALID(intnum) && bootverbose) {
1950 device_printf(pcib, "slot %d INT%c is routed to irq %d\n",
1951 pci_get_slot(dev), 'A' + pin - 1, intnum);
1956 /* Pass request to alloc MSI/MSI-X messages up to the parent bridge. */
1958 pcib_alloc_msi(device_t pcib, device_t dev, int count, int maxcount, int *irqs)
1960 struct pcib_softc *sc = device_get_softc(pcib);
1963 if (sc->flags & PCIB_DISABLE_MSI)
1965 bus = device_get_parent(pcib);
1966 return (PCIB_ALLOC_MSI(device_get_parent(bus), dev, count, maxcount,
1970 /* Pass request to release MSI/MSI-X messages up to the parent bridge. */
1972 pcib_release_msi(device_t pcib, device_t dev, int count, int *irqs)
1976 bus = device_get_parent(pcib);
1977 return (PCIB_RELEASE_MSI(device_get_parent(bus), dev, count, irqs));
1980 /* Pass request to alloc an MSI-X message up to the parent bridge. */
1982 pcib_alloc_msix(device_t pcib, device_t dev, int *irq)
1984 struct pcib_softc *sc = device_get_softc(pcib);
1987 if (sc->flags & PCIB_DISABLE_MSIX)
1989 bus = device_get_parent(pcib);
1990 return (PCIB_ALLOC_MSIX(device_get_parent(bus), dev, irq));
1993 /* Pass request to release an MSI-X message up to the parent bridge. */
1995 pcib_release_msix(device_t pcib, device_t dev, int irq)
1999 bus = device_get_parent(pcib);
2000 return (PCIB_RELEASE_MSIX(device_get_parent(bus), dev, irq));
2003 /* Pass request to map MSI/MSI-X message up to parent bridge. */
2005 pcib_map_msi(device_t pcib, device_t dev, int irq, uint64_t *addr,
2011 bus = device_get_parent(pcib);
2012 error = PCIB_MAP_MSI(device_get_parent(bus), dev, irq, addr, data);
2016 pci_ht_map_msi(pcib, *addr);
2020 /* Pass request for device power state up to parent bridge. */
2022 pcib_power_for_sleep(device_t pcib, device_t dev, int *pstate)
2026 bus = device_get_parent(pcib);
2027 return (PCIB_POWER_FOR_SLEEP(bus, dev, pstate));
2031 pcib_ari_enabled(device_t pcib)
2033 struct pcib_softc *sc;
2035 sc = device_get_softc(pcib);
2037 return ((sc->flags & PCIB_ENABLE_ARI) != 0);
2041 pcib_ari_get_rid(device_t pcib, device_t dev)
2043 struct pcib_softc *sc;
2044 uint8_t bus, slot, func;
2046 sc = device_get_softc(pcib);
2048 if (sc->flags & PCIB_ENABLE_ARI) {
2049 bus = pci_get_bus(dev);
2050 func = pci_get_function(dev);
2052 return (PCI_ARI_RID(bus, func));
2054 bus = pci_get_bus(dev);
2055 slot = pci_get_slot(dev);
2056 func = pci_get_function(dev);
2058 return (PCI_RID(bus, slot, func));
2063 * Check that the downstream port (pcib) and the endpoint device (dev) both
2064 * support ARI. If so, enable it and return 0, otherwise return an error.
2067 pcib_try_enable_ari(device_t pcib, device_t dev)
2069 struct pcib_softc *sc;
2076 sc = device_get_softc(pcib);
2079 * ARI is controlled in a register in the PCIe capability structure.
2080 * If the downstream port does not have the PCIe capability structure
2081 * then it does not support ARI.
2083 error = pci_find_cap(pcib, PCIY_EXPRESS, &pcie_pos);
2087 /* Check that the PCIe port advertises ARI support. */
2088 cap2 = pci_read_config(pcib, pcie_pos + PCIER_DEVICE_CAP2, 4);
2089 if (!(cap2 & PCIEM_CAP2_ARI))
2093 * Check that the endpoint device advertises ARI support via the ARI
2094 * extended capability structure.
2096 error = pci_find_extcap(dev, PCIZ_ARI, &ari_cap_off);
2101 * Finally, check that the endpoint device supports the same version
2102 * of ARI that we do.
2104 ari_ver = pci_read_config(dev, ari_cap_off, 4);
2105 if (PCI_EXTCAP_VER(ari_ver) != PCIB_SUPPORTED_ARI_VER) {
2108 "Unsupported version of ARI (%d) detected\n",
2109 PCI_EXTCAP_VER(ari_ver));
2114 pcib_enable_ari(sc, pcie_pos);