2 * Copyright 1998 Massachusetts Institute of Technology
4 * Permission to use, copy, modify, and distribute this software and
5 * its documentation for any purpose and without fee is hereby
6 * granted, provided that both the above copyright notice and this
7 * permission notice appear in all copies, that both the above
8 * copyright notice and this permission notice appear in all
9 * supporting documentation, and that the name of M.I.T. not be used
10 * in advertising or publicity pertaining to distribution of the
11 * software without specific, written prior permission. M.I.T. makes
12 * no representations about the suitability of this software for any
13 * purpose. It is provided "as is" without express or implied
16 * THIS SOFTWARE IS PROVIDED BY M.I.T. ``AS IS''. M.I.T. DISCLAIMS
17 * ALL EXPRESS OR IMPLIED WARRANTIES WITH REGARD TO THIS SOFTWARE,
18 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
19 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT
20 * SHALL M.I.T. BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
21 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
22 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
23 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
24 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
25 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
26 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 #include <sys/cdefs.h>
31 __FBSDID("$FreeBSD$");
34 * This code implements a `root nexus' for Intel Architecture
35 * machines. The function of the root nexus is to serve as an
36 * attachment point for both processors and buses, and to manage
37 * resources which are common to all of them. In particular,
38 * this code implements the core resource managers for interrupt
39 * requests, DMA requests (which rightfully should be a part of the
40 * ISA code but it's easier to do it here for now), I/O port addresses,
41 * and I/O memory address space.
51 #include <sys/param.h>
52 #include <sys/systm.h>
54 #include <sys/kernel.h>
55 #include <sys/linker.h>
56 #include <sys/malloc.h>
57 #include <sys/module.h>
58 #include <machine/bus.h>
59 #include <machine/intr_machdep.h>
61 #include <sys/interrupt.h>
63 #include <machine/vmparam.h>
66 #include <machine/pmap.h>
68 #include <machine/metadata.h>
69 #include <machine/nexusvar.h>
70 #include <machine/resource.h>
71 #include <machine/pc/bios.h>
78 #include <isa/isavar.h>
80 #include <pc98/cbus/cbus.h>
81 #elif defined(__amd64__)
82 #include <amd64/isa/isa.h>
84 #include <i386/isa/isa.h>
87 #include <sys/rtprio.h>
90 #define BUS_SPACE_IO AMD64_BUS_SPACE_IO
91 #define BUS_SPACE_MEM AMD64_BUS_SPACE_MEM
93 #define BUS_SPACE_IO I386_BUS_SPACE_IO
94 #define BUS_SPACE_MEM I386_BUS_SPACE_MEM
97 #define ELF_KERN_STR ("elf"__XSTRING(__ELF_WORD_SIZE)" kernel")
99 static MALLOC_DEFINE(M_NEXUSDEV, "nexusdev", "Nexus device");
101 #define DEVTONX(dev) ((struct nexus_device *)device_get_ivars(dev))
103 struct rman irq_rman, drq_rman, port_rman, mem_rman;
105 static int nexus_probe(device_t);
106 static int nexus_attach(device_t);
107 static int nexus_print_all_resources(device_t dev);
108 static int nexus_print_child(device_t, device_t);
109 static device_t nexus_add_child(device_t bus, u_int order, const char *name,
111 static struct resource *nexus_alloc_resource(device_t, device_t, int, int *,
112 u_long, u_long, u_long, u_int);
113 static int nexus_adjust_resource(device_t, device_t, int, struct resource *,
116 static int nexus_bind_intr(device_t, device_t, struct resource *, int);
118 static int nexus_config_intr(device_t, int, enum intr_trigger,
120 static int nexus_describe_intr(device_t dev, device_t child,
121 struct resource *irq, void *cookie,
123 static int nexus_activate_resource(device_t, device_t, int, int,
125 static int nexus_deactivate_resource(device_t, device_t, int, int,
127 static int nexus_release_resource(device_t, device_t, int, int,
129 static int nexus_setup_intr(device_t, device_t, struct resource *, int flags,
130 driver_filter_t filter, void (*)(void *), void *,
132 static int nexus_teardown_intr(device_t, device_t, struct resource *,
134 static struct resource_list *nexus_get_reslist(device_t dev, device_t child);
135 static int nexus_set_resource(device_t, device_t, int, int, u_long, u_long);
136 static int nexus_get_resource(device_t, device_t, int, int, u_long *, u_long *);
137 static void nexus_delete_resource(device_t, device_t, int, int);
139 static int nexus_alloc_msi(device_t pcib, device_t dev, int count, int maxcount, int *irqs);
140 static int nexus_release_msi(device_t pcib, device_t dev, int count, int *irqs);
141 static int nexus_alloc_msix(device_t pcib, device_t dev, int *irq);
142 static int nexus_release_msix(device_t pcib, device_t dev, int irq);
143 static int nexus_map_msi(device_t pcib, device_t dev, int irq, uint64_t *addr, uint32_t *data);
146 static device_method_t nexus_methods[] = {
147 /* Device interface */
148 DEVMETHOD(device_probe, nexus_probe),
149 DEVMETHOD(device_attach, nexus_attach),
150 DEVMETHOD(device_detach, bus_generic_detach),
151 DEVMETHOD(device_shutdown, bus_generic_shutdown),
152 DEVMETHOD(device_suspend, bus_generic_suspend),
153 DEVMETHOD(device_resume, bus_generic_resume),
156 DEVMETHOD(bus_print_child, nexus_print_child),
157 DEVMETHOD(bus_add_child, nexus_add_child),
158 DEVMETHOD(bus_alloc_resource, nexus_alloc_resource),
159 DEVMETHOD(bus_adjust_resource, nexus_adjust_resource),
160 DEVMETHOD(bus_release_resource, nexus_release_resource),
161 DEVMETHOD(bus_activate_resource, nexus_activate_resource),
162 DEVMETHOD(bus_deactivate_resource, nexus_deactivate_resource),
163 DEVMETHOD(bus_setup_intr, nexus_setup_intr),
164 DEVMETHOD(bus_teardown_intr, nexus_teardown_intr),
166 DEVMETHOD(bus_bind_intr, nexus_bind_intr),
168 DEVMETHOD(bus_config_intr, nexus_config_intr),
169 DEVMETHOD(bus_describe_intr, nexus_describe_intr),
170 DEVMETHOD(bus_get_resource_list, nexus_get_reslist),
171 DEVMETHOD(bus_set_resource, nexus_set_resource),
172 DEVMETHOD(bus_get_resource, nexus_get_resource),
173 DEVMETHOD(bus_delete_resource, nexus_delete_resource),
177 DEVMETHOD(pcib_alloc_msi, nexus_alloc_msi),
178 DEVMETHOD(pcib_release_msi, nexus_release_msi),
179 DEVMETHOD(pcib_alloc_msix, nexus_alloc_msix),
180 DEVMETHOD(pcib_release_msix, nexus_release_msix),
181 DEVMETHOD(pcib_map_msi, nexus_map_msi),
187 DEFINE_CLASS_0(nexus, nexus_driver, nexus_methods, 1);
188 static devclass_t nexus_devclass;
190 DRIVER_MODULE(nexus, root, nexus_driver, nexus_devclass, 0, 0);
193 nexus_probe(device_t dev)
196 device_quiet(dev); /* suppress attach message for neatness */
197 return (BUS_PROBE_GENERIC);
201 nexus_init_resources(void)
208 * - IRQ resource creation should be moved to the PIC/APIC driver.
209 * - DRQ resource creation should be moved to the DMAC driver.
210 * - The above should be sorted to probe earlier than any child busses.
212 * - Leave I/O and memory creation here, as child probes may need them.
213 * (especially eg. ACPI)
217 * IRQ's are on the mainboard on old systems, but on the ISA part
218 * of PCI->ISA bridges. There would be multiple sets of IRQs on
219 * multi-ISA-bus systems. PCI interrupts are routed to the ISA
220 * component, so in a way, PCI can be a partial child of an ISA bus(!).
221 * APIC interrupts are global though.
223 irq_rman.rm_start = 0;
224 irq_rman.rm_type = RMAN_ARRAY;
225 irq_rman.rm_descr = "Interrupt request lines";
226 irq_rman.rm_end = NUM_IO_INTS - 1;
227 if (rman_init(&irq_rman))
228 panic("nexus_init_resources irq_rman");
231 * We search for regions of existing IRQs and add those to the IRQ
234 for (irq = 0; irq < NUM_IO_INTS; irq++)
235 if (intr_lookup_source(irq) != NULL)
236 if (rman_manage_region(&irq_rman, irq, irq) != 0)
237 panic("nexus_init_resources irq_rman add");
240 * ISA DMA on PCI systems is implemented in the ISA part of each
241 * PCI->ISA bridge and the channels can be duplicated if there are
242 * multiple bridges. (eg: laptops with docking stations)
244 drq_rman.rm_start = 0;
250 drq_rman.rm_type = RMAN_ARRAY;
251 drq_rman.rm_descr = "DMA request lines";
252 /* XXX drq 0 not available on some machines */
253 if (rman_init(&drq_rman)
254 || rman_manage_region(&drq_rman,
255 drq_rman.rm_start, drq_rman.rm_end))
256 panic("nexus_init_resources drq_rman");
259 * However, IO ports and Memory truely are global at this level,
260 * as are APIC interrupts (however many IO APICS there turn out
261 * to be on large systems..)
263 port_rman.rm_start = 0;
264 port_rman.rm_end = 0xffff;
265 port_rman.rm_type = RMAN_ARRAY;
266 port_rman.rm_descr = "I/O ports";
267 if (rman_init(&port_rman)
268 || rman_manage_region(&port_rman, 0, 0xffff))
269 panic("nexus_init_resources port_rman");
271 mem_rman.rm_start = 0;
272 mem_rman.rm_end = ~0ul;
273 mem_rman.rm_type = RMAN_ARRAY;
274 mem_rman.rm_descr = "I/O memory addresses";
275 if (rman_init(&mem_rman)
276 || rman_manage_region(&mem_rman, 0, ~0))
277 panic("nexus_init_resources mem_rman");
281 nexus_attach(device_t dev)
284 nexus_init_resources();
285 bus_generic_probe(dev);
288 * Explicitly add the legacy0 device here. Other platform
289 * types (such as ACPI), use their own nexus(4) subclass
290 * driver to override this routine and add their own root bus.
292 if (BUS_ADD_CHILD(dev, 10, "legacy", 0) == NULL)
293 panic("legacy: could not attach");
294 bus_generic_attach(dev);
299 nexus_print_all_resources(device_t dev)
301 struct nexus_device *ndev = DEVTONX(dev);
302 struct resource_list *rl = &ndev->nx_resources;
305 if (STAILQ_FIRST(rl))
306 retval += printf(" at");
308 retval += resource_list_print_type(rl, "port", SYS_RES_IOPORT, "%#lx");
309 retval += resource_list_print_type(rl, "iomem", SYS_RES_MEMORY, "%#lx");
310 retval += resource_list_print_type(rl, "irq", SYS_RES_IRQ, "%ld");
316 nexus_print_child(device_t bus, device_t child)
320 retval += bus_print_child_header(bus, child);
321 retval += nexus_print_all_resources(child);
322 if (device_get_flags(child))
323 retval += printf(" flags %#x", device_get_flags(child));
324 retval += printf(" on motherboard\n"); /* XXX "motherboard", ick */
330 nexus_add_child(device_t bus, u_int order, const char *name, int unit)
333 struct nexus_device *ndev;
335 ndev = malloc(sizeof(struct nexus_device), M_NEXUSDEV, M_NOWAIT|M_ZERO);
338 resource_list_init(&ndev->nx_resources);
340 child = device_add_child_ordered(bus, order, name, unit);
342 /* should we free this in nexus_child_detached? */
343 device_set_ivars(child, ndev);
366 * Allocate a resource on behalf of child. NB: child is usually going to be a
367 * child of one of our descendants, not a direct child of nexus0.
368 * (Exceptions include npx.)
370 static struct resource *
371 nexus_alloc_resource(device_t bus, device_t child, int type, int *rid,
372 u_long start, u_long end, u_long count, u_int flags)
374 struct nexus_device *ndev = DEVTONX(child);
376 struct resource_list_entry *rle;
378 int needactivate = flags & RF_ACTIVE;
381 * If this is an allocation of the "default" range for a given RID, and
382 * we know what the resources for this device are (ie. they aren't maintained
383 * by a child bus), then work out the start/end values.
385 if ((start == 0UL) && (end == ~0UL) && (count == 1)) {
388 rle = resource_list_find(&ndev->nx_resources, type, *rid);
397 rm = nexus_rman(type);
401 rv = rman_reserve_resource(rm, start, end, count, flags, child);
404 rman_set_rid(rv, *rid);
407 if (bus_activate_resource(child, type, *rid, rv)) {
408 rman_release_resource(rv);
417 nexus_adjust_resource(device_t bus, device_t child, int type,
418 struct resource *r, u_long start, u_long end)
422 rm = nexus_rman(type);
425 if (!rman_is_region_manager(r, rm))
427 return (rman_adjust_resource(r, start, end));
431 nexus_activate_resource(device_t bus, device_t child, int type, int rid,
435 bus_space_handle_t bh;
441 * If this is a memory resource, map it into the kernel.
446 error = i386_bus_space_handle_alloc(I386_BUS_SPACE_IO,
447 rman_get_start(r), rman_get_size(r), &bh);
450 rman_set_bushandle(r, bh);
452 rman_set_bushandle(r, rman_get_start(r));
454 rman_set_bustag(r, BUS_SPACE_IO);
458 error = i386_bus_space_handle_alloc(I386_BUS_SPACE_MEM,
459 rman_get_start(r), rman_get_size(r), &bh);
463 vaddr = pmap_mapdev(rman_get_start(r), rman_get_size(r));
464 rman_set_virtual(r, vaddr);
465 rman_set_bustag(r, BUS_SPACE_MEM);
467 /* PC-98: the type of bus_space_handle_t is the structure. */
468 bh->bsh_base = (bus_addr_t) vaddr;
469 rman_set_bushandle(r, bh);
471 /* IBM-PC: the type of bus_space_handle_t is u_int */
472 rman_set_bushandle(r, (bus_space_handle_t) vaddr);
475 return (rman_activate_resource(r));
479 nexus_deactivate_resource(device_t bus, device_t child, int type, int rid,
484 * If this is a memory resource, unmap it.
486 if (type == SYS_RES_MEMORY) {
487 pmap_unmapdev((vm_offset_t)rman_get_virtual(r),
491 if (type == SYS_RES_MEMORY || type == SYS_RES_IOPORT) {
492 bus_space_handle_t bh;
494 bh = rman_get_bushandle(r);
495 i386_bus_space_handle_free(rman_get_bustag(r), bh, bh->bsh_sz);
498 return (rman_deactivate_resource(r));
502 nexus_release_resource(device_t bus, device_t child, int type, int rid,
505 if (rman_get_flags(r) & RF_ACTIVE) {
506 int error = bus_deactivate_resource(child, type, rid, r);
510 return (rman_release_resource(r));
514 * Currently this uses the really grody interface from kern/kern_intr.c
515 * (which really doesn't belong in kern/anything.c). Eventually, all of
516 * the code in kern_intr.c and machdep_intr.c should get moved here, since
517 * this is going to be the official interface.
520 nexus_setup_intr(device_t bus, device_t child, struct resource *irq,
521 int flags, driver_filter_t filter, void (*ihand)(void *),
522 void *arg, void **cookiep)
526 /* somebody tried to setup an irq that failed to allocate! */
528 panic("nexus_setup_intr: NULL irq resource!");
531 if ((rman_get_flags(irq) & RF_SHAREABLE) == 0)
535 * We depend here on rman_activate_resource() being idempotent.
537 error = rman_activate_resource(irq);
541 error = intr_add_handler(device_get_nameunit(child),
542 rman_get_start(irq), filter, ihand, arg, flags, cookiep);
548 nexus_teardown_intr(device_t dev, device_t child, struct resource *r, void *ih)
550 return (intr_remove_handler(ih));
555 nexus_bind_intr(device_t dev, device_t child, struct resource *irq, int cpu)
557 return (intr_bind(rman_get_start(irq), cpu));
562 nexus_config_intr(device_t dev, int irq, enum intr_trigger trig,
563 enum intr_polarity pol)
565 return (intr_config_intr(irq, trig, pol));
569 nexus_describe_intr(device_t dev, device_t child, struct resource *irq,
570 void *cookie, const char *descr)
573 return (intr_describe(rman_get_start(irq), cookie, descr));
576 static struct resource_list *
577 nexus_get_reslist(device_t dev, device_t child)
579 struct nexus_device *ndev = DEVTONX(child);
581 return (&ndev->nx_resources);
585 nexus_set_resource(device_t dev, device_t child, int type, int rid, u_long start, u_long count)
587 struct nexus_device *ndev = DEVTONX(child);
588 struct resource_list *rl = &ndev->nx_resources;
590 /* XXX this should return a success/failure indicator */
591 resource_list_add(rl, type, rid, start, start + count - 1, count);
596 nexus_get_resource(device_t dev, device_t child, int type, int rid, u_long *startp, u_long *countp)
598 struct nexus_device *ndev = DEVTONX(child);
599 struct resource_list *rl = &ndev->nx_resources;
600 struct resource_list_entry *rle;
602 rle = resource_list_find(rl, type, rid);
606 *startp = rle->start;
608 *countp = rle->count;
613 nexus_delete_resource(device_t dev, device_t child, int type, int rid)
615 struct nexus_device *ndev = DEVTONX(child);
616 struct resource_list *rl = &ndev->nx_resources;
618 resource_list_delete(rl, type, rid);
621 /* Called from the MSI code to add new IRQs to the IRQ rman. */
623 nexus_add_irq(u_long irq)
626 if (rman_manage_region(&irq_rman, irq, irq) != 0)
627 panic("%s: failed", __func__);
632 nexus_alloc_msix(device_t pcib, device_t dev, int *irq)
635 return (msix_alloc(dev, irq));
639 nexus_release_msix(device_t pcib, device_t dev, int irq)
642 return (msix_release(irq));
646 nexus_alloc_msi(device_t pcib, device_t dev, int count, int maxcount, int *irqs)
649 return (msi_alloc(dev, count, maxcount, irqs));
653 nexus_release_msi(device_t pcib, device_t dev, int count, int *irqs)
656 return (msi_release(irqs, count));
660 nexus_map_msi(device_t pcib, device_t dev, int irq, uint64_t *addr, uint32_t *data)
663 return (msi_map(irq, addr, data));
667 /* Placeholder for system RAM. */
669 ram_identify(driver_t *driver, device_t parent)
672 if (resource_disabled("ram", 0))
674 if (BUS_ADD_CHILD(parent, 0, "ram", 0) == NULL)
675 panic("ram_identify");
679 ram_probe(device_t dev)
683 device_set_desc(dev, "System RAM");
688 ram_attach(device_t dev)
690 struct bios_smap *smapbase, *smap, *smapend;
691 struct resource *res;
697 /* Retrieve the system memory map from the loader. */
698 kmdp = preload_search_by_type("elf kernel");
700 kmdp = preload_search_by_type(ELF_KERN_STR);
702 smapbase = (struct bios_smap *)preload_search_info(kmdp,
703 MODINFO_METADATA | MODINFOMD_SMAP);
706 if (smapbase != NULL) {
707 smapsize = *((u_int32_t *)smapbase - 1);
708 smapend = (struct bios_smap *)((uintptr_t)smapbase + smapsize);
711 for (smap = smapbase; smap < smapend; smap++) {
712 if (smap->type != SMAP_TYPE_MEMORY ||
717 * Resources use long's to track resources, so
718 * we can't include memory regions above 4GB.
720 if (smap->base > ~0ul)
723 error = bus_set_resource(dev, SYS_RES_MEMORY, rid,
724 smap->base, smap->length);
727 "ram_attach: resource %d failed set with %d",
729 res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid,
732 panic("ram_attach: resource %d failed to attach",
740 * If the system map is not available, fall back to using
741 * dump_avail[]. We use the dump_avail[] array rather than
742 * phys_avail[] for the memory map as phys_avail[] contains
743 * holes for kernel memory, page 0, the message buffer, and
744 * the dcons buffer. We test the end address in the loop
745 * instead of the start since the start address for the first
748 for (rid = 0, p = dump_avail; p[1] != 0; rid++, p += 2) {
751 * Resources use long's to track resources, so we can't
752 * include memory regions above 4GB.
757 error = bus_set_resource(dev, SYS_RES_MEMORY, rid, p[0],
760 panic("ram_attach: resource %d failed set with %d", rid,
762 res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid, 0);
764 panic("ram_attach: resource %d failed to attach", rid);
769 static device_method_t ram_methods[] = {
770 /* Device interface */
771 DEVMETHOD(device_identify, ram_identify),
772 DEVMETHOD(device_probe, ram_probe),
773 DEVMETHOD(device_attach, ram_attach),
777 static driver_t ram_driver = {
783 static devclass_t ram_devclass;
785 DRIVER_MODULE(ram, nexus, ram_driver, ram_devclass, 0, 0);
789 * Placeholder which claims PnP 'devices' which describe system
792 static struct isa_pnp_id sysresource_ids[] = {
793 { 0x010cd041 /* PNP0c01 */, "System Memory" },
794 { 0x020cd041 /* PNP0c02 */, "System Resource" },
799 sysresource_probe(device_t dev)
803 if ((result = ISA_PNP_PROBE(device_get_parent(dev), dev, sysresource_ids)) <= 0) {
810 sysresource_attach(device_t dev)
815 static device_method_t sysresource_methods[] = {
816 /* Device interface */
817 DEVMETHOD(device_probe, sysresource_probe),
818 DEVMETHOD(device_attach, sysresource_attach),
819 DEVMETHOD(device_detach, bus_generic_detach),
820 DEVMETHOD(device_shutdown, bus_generic_shutdown),
821 DEVMETHOD(device_suspend, bus_generic_suspend),
822 DEVMETHOD(device_resume, bus_generic_resume),
826 static driver_t sysresource_driver = {
832 static devclass_t sysresource_devclass;
834 DRIVER_MODULE(sysresource, isa, sysresource_driver, sysresource_devclass, 0, 0);