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
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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
29 * $FreeBSD: src/sys/i386/i386/nexus.c,v 1.26.2.10 2003/02/22 13:16:45 imp Exp $
30 * $DragonFly: src/sys/i386/i386/Attic/nexus.c,v 1.12 2005/02/27 10:57:24 swildner Exp $
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.
46 #include <sys/param.h>
47 #include <sys/systm.h>
49 #include <sys/kernel.h>
50 #include <sys/malloc.h>
51 #include <sys/module.h>
52 #include <machine/bus.h>
55 #include <machine/vmparam.h>
58 #include <machine/pmap.h>
60 #include <machine/nexusvar.h>
61 #include <machine/resource.h>
63 #include <machine/smp.h>
64 #include <machine/mpapic.h>
67 #include <bus/isa/isavar.h>
68 #include <bus/isa/i386/isa.h>
69 #include <i386/isa/intr_machdep.h>
71 static MALLOC_DEFINE(M_NEXUSDEV, "nexusdev", "Nexus device");
73 struct resource_list nx_resources;
77 #define DEVTONX(dev) ((struct nexus_device *)device_get_ivars(dev))
79 static struct rman irq_rman, drq_rman, port_rman, mem_rman;
81 static void nexus_identify(driver_t *, device_t);
82 static int nexus_probe(device_t);
83 static int nexus_attach(device_t);
84 static int nexus_print_all_resources(device_t dev);
85 static int nexus_print_child(device_t, device_t);
86 static device_t nexus_add_child(device_t bus, int order, const char *name,
88 static struct resource *nexus_alloc_resource(device_t, device_t, int, int *,
89 u_long, u_long, u_long, u_int);
90 static int nexus_read_ivar(device_t, device_t, int, uintptr_t *);
91 static int nexus_write_ivar(device_t, device_t, int, uintptr_t);
92 static int nexus_activate_resource(device_t, device_t, int, int,
94 static int nexus_deactivate_resource(device_t, device_t, int, int,
96 static int nexus_release_resource(device_t, device_t, int, int,
98 static int nexus_setup_intr(device_t, device_t, struct resource *, int flags,
99 void (*)(void *), void *, void **);
100 static int nexus_teardown_intr(device_t, device_t, struct resource *,
102 static int nexus_set_resource(device_t, device_t, int, int, u_long, u_long);
103 static int nexus_get_resource(device_t, device_t, int, int, u_long *, u_long *);
104 static void nexus_delete_resource(device_t, device_t, int, int);
106 static device_method_t nexus_methods[] = {
107 /* Device interface */
108 DEVMETHOD(device_identify, nexus_identify),
109 DEVMETHOD(device_probe, nexus_probe),
110 DEVMETHOD(device_attach, nexus_attach),
111 DEVMETHOD(device_detach, bus_generic_detach),
112 DEVMETHOD(device_shutdown, bus_generic_shutdown),
113 DEVMETHOD(device_suspend, bus_generic_suspend),
114 DEVMETHOD(device_resume, bus_generic_resume),
117 DEVMETHOD(bus_print_child, nexus_print_child),
118 DEVMETHOD(bus_add_child, nexus_add_child),
119 DEVMETHOD(bus_read_ivar, nexus_read_ivar),
120 DEVMETHOD(bus_write_ivar, nexus_write_ivar),
121 DEVMETHOD(bus_alloc_resource, nexus_alloc_resource),
122 DEVMETHOD(bus_release_resource, nexus_release_resource),
123 DEVMETHOD(bus_activate_resource, nexus_activate_resource),
124 DEVMETHOD(bus_deactivate_resource, nexus_deactivate_resource),
125 DEVMETHOD(bus_setup_intr, nexus_setup_intr),
126 DEVMETHOD(bus_teardown_intr, nexus_teardown_intr),
127 DEVMETHOD(bus_set_resource, nexus_set_resource),
128 DEVMETHOD(bus_get_resource, nexus_get_resource),
129 DEVMETHOD(bus_delete_resource, nexus_delete_resource),
134 static driver_t nexus_driver = {
139 static devclass_t nexus_devclass;
141 DRIVER_MODULE(nexus, root, nexus_driver, nexus_devclass, 0, 0);
144 nexus_identify(driver_t *driver, device_t parent)
147 * Add child device with order of 1 so it gets probed
148 * after ACPI (which is at order 0.
150 if (BUS_ADD_CHILD(parent, 1, "legacy", 0) == NULL)
151 panic("legacy: could not attach");
155 nexus_probe(device_t dev)
163 * Fail to probe if ACPI is ok.
165 acpi = devclass_get_device(devclass_find("acpi"), 0);
166 if (acpi != NULL && device_is_alive(acpi))
170 device_quiet(dev); /* suppress attach message for neatness */
173 * IRQ's are on the mainboard on old systems, but on the ISA part
174 * of PCI->ISA bridges. There would be multiple sets of IRQs on
175 * multi-ISA-bus systems. PCI interrupts are routed to the ISA
176 * component, so in a way, PCI can be a partial child of an ISA bus(!).
177 * APIC interrupts are global though.
178 * In the non-APIC case, disallow the use of IRQ 2.
180 irq_rman.rm_start = 0;
181 irq_rman.rm_type = RMAN_ARRAY;
182 irq_rman.rm_descr = "Interrupt request lines";
184 irq_rman.rm_end = APIC_INTMAPSIZE - 1;
185 if (rman_init(&irq_rman)
186 || rman_manage_region(&irq_rman,
187 irq_rman.rm_start, irq_rman.rm_end))
188 panic("nexus_probe irq_rman");
190 irq_rman.rm_end = 15;
191 if (rman_init(&irq_rman)
192 || rman_manage_region(&irq_rman, irq_rman.rm_start, 1)
193 || rman_manage_region(&irq_rman, 3, irq_rman.rm_end))
194 panic("nexus_probe irq_rman");
198 * ISA DMA on PCI systems is implemented in the ISA part of each
199 * PCI->ISA bridge and the channels can be duplicated if there are
200 * multiple bridges. (eg: laptops with docking stations)
202 drq_rman.rm_start = 0;
204 drq_rman.rm_type = RMAN_ARRAY;
205 drq_rman.rm_descr = "DMA request lines";
206 /* XXX drq 0 not available on some machines */
207 if (rman_init(&drq_rman)
208 || rman_manage_region(&drq_rman,
209 drq_rman.rm_start, drq_rman.rm_end))
210 panic("nexus_probe drq_rman");
213 * However, IO ports and Memory truely are global at this level,
214 * as are APIC interrupts (however many IO APICS there turn out
215 * to be on large systems..)
217 port_rman.rm_start = 0;
218 port_rman.rm_end = 0xffff;
219 port_rman.rm_type = RMAN_ARRAY;
220 port_rman.rm_descr = "I/O ports";
221 if (rman_init(&port_rman)
222 || rman_manage_region(&port_rman, 0, 0xffff))
223 panic("nexus_probe port_rman");
225 mem_rman.rm_start = 0;
226 mem_rman.rm_end = ~0u;
227 mem_rman.rm_type = RMAN_ARRAY;
228 mem_rman.rm_descr = "I/O memory addresses";
229 if (rman_init(&mem_rman)
230 || rman_manage_region(&mem_rman, 0, ~0))
231 panic("nexus_probe mem_rman");
233 return bus_generic_probe(dev);
237 nexus_attach(device_t dev)
242 * First, let our child driver's identify any child devices that
243 * they can find. Once that is done attach any devices that we
247 bus_generic_probe(dev);
249 bus_generic_attach(dev);
252 * And if we didn't see EISA or ISA on a pci bridge, create some
253 * connection points now so they show up "on motherboard".
255 if (!devclass_get_device(devclass_find("eisa"), 0)) {
256 child = BUS_ADD_CHILD(dev, 0, "eisa", 0);
258 panic("nexus_attach eisa");
259 device_probe_and_attach(child);
262 if (!devclass_get_device(devclass_find("mca"), 0)) {
263 child = BUS_ADD_CHILD(dev, 0, "mca", 0);
265 panic("nexus_probe mca");
266 device_probe_and_attach(child);
269 if (!devclass_get_device(devclass_find("isa"), 0)) {
270 child = BUS_ADD_CHILD(dev, 0, "isa", 0);
272 panic("nexus_attach isa");
273 device_probe_and_attach(child);
280 nexus_print_all_resources(device_t dev)
282 struct nexus_device *ndev = DEVTONX(dev);
283 struct resource_list *rl = &ndev->nx_resources;
286 if (SLIST_FIRST(rl) || ndev->nx_pcibus != -1)
287 retval += printf(" at");
289 retval += resource_list_print_type(rl, "port", SYS_RES_IOPORT, "%#lx");
290 retval += resource_list_print_type(rl, "iomem", SYS_RES_MEMORY, "%#lx");
291 retval += resource_list_print_type(rl, "irq", SYS_RES_IRQ, "%ld");
297 nexus_print_child(device_t bus, device_t child)
299 struct nexus_device *ndev = DEVTONX(child);
302 retval += bus_print_child_header(bus, child);
303 retval += nexus_print_all_resources(child);
304 if (ndev->nx_pcibus != -1)
305 retval += printf(" pcibus %d", ndev->nx_pcibus);
306 retval += printf(" on motherboard\n");
312 nexus_add_child(device_t bus, int order, const char *name, int unit)
315 struct nexus_device *ndev;
317 ndev = malloc(sizeof(struct nexus_device), M_NEXUSDEV, M_INTWAIT|M_ZERO);
320 resource_list_init(&ndev->nx_resources);
321 ndev->nx_pcibus = -1;
323 child = device_add_child_ordered(bus, order, name, unit);
325 /* should we free this in nexus_child_detached? */
326 device_set_ivars(child, ndev);
332 nexus_read_ivar(device_t dev, device_t child, int which, uintptr_t *result)
334 struct nexus_device *ndev = DEVTONX(child);
337 case NEXUS_IVAR_PCIBUS:
338 *result = ndev->nx_pcibus;
347 nexus_write_ivar(device_t dev, device_t child, int which, uintptr_t value)
349 struct nexus_device *ndev = DEVTONX(child);
352 case NEXUS_IVAR_PCIBUS:
353 ndev->nx_pcibus = value;
362 * Allocate a resource on behalf of child. NB: child is usually going to be a
363 * child of one of our descendants, not a direct child of nexus0.
364 * (Exceptions include npx.)
366 static struct resource *
367 nexus_alloc_resource(device_t bus, device_t child, int type, int *rid,
368 u_long start, u_long end, u_long count, u_int flags)
370 struct nexus_device *ndev = DEVTONX(child);
372 struct resource_list_entry *rle;
374 int needactivate = flags & RF_ACTIVE;
377 * If this is an allocation of the "default" range for a given RID, and
378 * we know what the resources for this device are (ie. they aren't maintained
379 * by a child bus), then work out the start/end values.
381 if ((start == 0UL) && (end == ~0UL) && (count == 1)) {
384 rle = resource_list_find(&ndev->nx_resources, type, *rid);
415 rv = rman_reserve_resource(rm, start, end, count, flags, child);
419 if (type == SYS_RES_MEMORY) {
420 rman_set_bustag(rv, I386_BUS_SPACE_MEM);
421 } else if (type == SYS_RES_IOPORT) {
422 rman_set_bustag(rv, I386_BUS_SPACE_IO);
423 rman_set_bushandle(rv, rv->r_start);
427 if (bus_activate_resource(child, type, *rid, rv)) {
428 rman_release_resource(rv);
437 nexus_activate_resource(device_t bus, device_t child, int type, int rid,
441 * If this is a memory resource, map it into the kernel.
443 if (rman_get_bustag(r) == I386_BUS_SPACE_MEM) {
446 if (rman_get_end(r) < 1024 * 1024) {
448 * The first 1Mb is mapped at KERNBASE.
450 vaddr = (caddr_t)(uintptr_t)(KERNBASE + rman_get_start(r));
456 paddr = rman_get_start(r);
457 psize = rman_get_size(r);
459 poffs = paddr - trunc_page(paddr);
460 vaddr = (caddr_t) pmap_mapdev(paddr-poffs, psize+poffs) + poffs;
462 rman_set_virtual(r, vaddr);
463 /* IBM-PC: the type of bus_space_handle_t is u_int */
464 rman_set_bushandle(r, (bus_space_handle_t) vaddr);
466 return (rman_activate_resource(r));
470 nexus_deactivate_resource(device_t bus, device_t child, int type, int rid,
474 * If this is a memory resource, unmap it.
476 if ((rman_get_bustag(r) == I386_BUS_SPACE_MEM) &&
477 (rman_get_end(r) >= 1024 * 1024)) {
480 psize = rman_get_size(r);
481 pmap_unmapdev((vm_offset_t)rman_get_virtual(r), psize);
484 return (rman_deactivate_resource(r));
488 nexus_release_resource(device_t bus, device_t child, int type, int rid,
491 if (rman_get_flags(r) & RF_ACTIVE) {
492 int error = bus_deactivate_resource(child, type, rid, r);
496 return (rman_release_resource(r));
500 * Currently this uses the really grody interface from kern/kern_intr.c
501 * (which really doesn't belong in kern/anything.c). Eventually, all of
502 * the code in kern_intr.c and machdep_intr.c should get moved here, since
503 * this is going to be the official interface.
506 nexus_setup_intr(device_t bus, device_t child, struct resource *irq,
507 int flags, void (*ihand)(void *), void *arg, void **cookiep)
513 /* somebody tried to setup an irq that failed to allocate! */
515 panic("nexus_setup_intr: NULL irq resource!");
518 if (irq->r_flags & RF_SHAREABLE)
523 driver = device_get_driver(child);
524 switch (flags & INTR_TYPE_MASK) {
540 printf("nexus: Warning: do not know what imask to use for INTR_TYPE_CLK\n");
546 panic("still using grody create_intr interface");
548 if (flags & INTR_FAST)
549 icflags |= INTR_FAST;
552 * We depend here on rman_activate_resource() being idempotent.
554 error = rman_activate_resource(irq);
558 *cookiep = inthand_add(device_get_nameunit(child), irq->r_start,
559 ihand, arg, mask, icflags);
560 if (*cookiep == NULL)
561 error = EINVAL; /* XXX ??? */
567 nexus_teardown_intr(device_t dev, device_t child, struct resource *r, void *ih)
569 return (inthand_remove(ih));
573 nexus_set_resource(device_t dev, device_t child, int type, int rid, u_long start, u_long count)
575 struct nexus_device *ndev = DEVTONX(child);
576 struct resource_list *rl = &ndev->nx_resources;
578 /* XXX this should return a success/failure indicator */
579 resource_list_add(rl, type, rid, start, start + count - 1, count);
584 nexus_get_resource(device_t dev, device_t child, int type, int rid, u_long *startp, u_long *countp)
586 struct nexus_device *ndev = DEVTONX(child);
587 struct resource_list *rl = &ndev->nx_resources;
588 struct resource_list_entry *rle;
590 rle = resource_list_find(rl, type, rid);
591 device_printf(child, "type %d rid %d startp %p countp %p - got %p\n",
592 type, rid, startp, countp, rle);
596 *startp = rle->start;
598 *countp = rle->count;
603 nexus_delete_resource(device_t dev, device_t child, int type, int rid)
605 struct nexus_device *ndev = DEVTONX(child);
606 struct resource_list *rl = &ndev->nx_resources;
608 resource_list_delete(rl, type, rid);
612 * Placeholder which claims PnP 'devices' which describe system
615 static struct isa_pnp_id sysresource_ids[] = {
616 { 0x010cd041 /* PNP0c01 */, "System Memory" },
617 { 0x020cd041 /* PNP0c02 */, "System Resource" },
622 sysresource_probe(device_t dev)
626 if ((result = ISA_PNP_PROBE(device_get_parent(dev), dev, sysresource_ids)) >= 0) {
633 sysresource_attach(device_t dev)
638 static device_method_t sysresource_methods[] = {
639 /* Device interface */
640 DEVMETHOD(device_probe, sysresource_probe),
641 DEVMETHOD(device_attach, sysresource_attach),
642 DEVMETHOD(device_detach, bus_generic_detach),
643 DEVMETHOD(device_shutdown, bus_generic_shutdown),
644 DEVMETHOD(device_suspend, bus_generic_suspend),
645 DEVMETHOD(device_resume, bus_generic_resume),
649 static driver_t sysresource_driver = {
655 static devclass_t sysresource_devclass;
657 DRIVER_MODULE(sysresource, isa, sysresource_driver, sysresource_devclass, 0, 0);