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
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9 * supporting documentation, and that the name of M.I.T. not be used
10 * in advertising or publicity pertaining to distribution of the
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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 1.9 2004/02/23 21:23:42 dillon 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>
69 #include <pc98/pc98/pc98.h>
71 #include <bus/isa/i386/isa.h>
73 #include <i386/isa/intr_machdep.h>
75 static MALLOC_DEFINE(M_NEXUSDEV, "nexusdev", "Nexus device");
77 struct resource_list nx_resources;
81 #define DEVTONX(dev) ((struct nexus_device *)device_get_ivars(dev))
83 static struct rman irq_rman, drq_rman, port_rman, mem_rman;
85 static int nexus_probe(device_t);
86 static int nexus_attach(device_t);
87 static int nexus_print_all_resources(device_t dev);
88 static int nexus_print_child(device_t, device_t);
89 static device_t nexus_add_child(device_t bus, int order, const char *name,
91 static struct resource *nexus_alloc_resource(device_t, device_t, int, int *,
92 u_long, u_long, u_long, u_int);
93 static int nexus_read_ivar(device_t, device_t, int, uintptr_t *);
94 static int nexus_write_ivar(device_t, device_t, int, uintptr_t);
95 static int nexus_activate_resource(device_t, device_t, int, int,
97 static int nexus_deactivate_resource(device_t, device_t, int, int,
99 static int nexus_release_resource(device_t, device_t, int, int,
101 static int nexus_setup_intr(device_t, device_t, struct resource *, int flags,
102 void (*)(void *), void *, void **);
103 static int nexus_teardown_intr(device_t, device_t, struct resource *,
105 static int nexus_set_resource(device_t, device_t, int, int, u_long, u_long);
106 static int nexus_get_resource(device_t, device_t, int, int, u_long *, u_long *);
107 static void nexus_delete_resource(device_t, device_t, int, int);
109 static device_method_t nexus_methods[] = {
110 /* Device interface */
111 DEVMETHOD(device_probe, nexus_probe),
112 DEVMETHOD(device_attach, nexus_attach),
113 DEVMETHOD(device_detach, bus_generic_detach),
114 DEVMETHOD(device_shutdown, bus_generic_shutdown),
115 DEVMETHOD(device_suspend, bus_generic_suspend),
116 DEVMETHOD(device_resume, bus_generic_resume),
119 DEVMETHOD(bus_print_child, nexus_print_child),
120 DEVMETHOD(bus_add_child, nexus_add_child),
121 DEVMETHOD(bus_read_ivar, nexus_read_ivar),
122 DEVMETHOD(bus_write_ivar, nexus_write_ivar),
123 DEVMETHOD(bus_alloc_resource, nexus_alloc_resource),
124 DEVMETHOD(bus_release_resource, nexus_release_resource),
125 DEVMETHOD(bus_activate_resource, nexus_activate_resource),
126 DEVMETHOD(bus_deactivate_resource, nexus_deactivate_resource),
127 DEVMETHOD(bus_setup_intr, nexus_setup_intr),
128 DEVMETHOD(bus_teardown_intr, nexus_teardown_intr),
129 DEVMETHOD(bus_set_resource, nexus_set_resource),
130 DEVMETHOD(bus_get_resource, nexus_get_resource),
131 DEVMETHOD(bus_delete_resource, nexus_delete_resource),
136 static driver_t nexus_driver = {
141 static devclass_t nexus_devclass;
143 DRIVER_MODULE(nexus, root, nexus_driver, nexus_devclass, 0, 0);
146 nexus_probe(device_t dev)
149 device_quiet(dev); /* suppress attach message for neatness */
152 * IRQ's are on the mainboard on old systems, but on the ISA part
153 * of PCI->ISA bridges. There would be multiple sets of IRQs on
154 * multi-ISA-bus systems. PCI interrupts are routed to the ISA
155 * component, so in a way, PCI can be a partial child of an ISA bus(!).
156 * APIC interrupts are global though.
157 * In the non-APIC case, disallow the use of IRQ 2.
159 irq_rman.rm_start = 0;
160 irq_rman.rm_type = RMAN_ARRAY;
161 irq_rman.rm_descr = "Interrupt request lines";
163 irq_rman.rm_end = APIC_INTMAPSIZE - 1;
164 if (rman_init(&irq_rman)
165 || rman_manage_region(&irq_rman,
166 irq_rman.rm_start, irq_rman.rm_end))
167 panic("nexus_probe irq_rman");
169 irq_rman.rm_end = 15;
171 if (rman_init(&irq_rman)
172 || rman_manage_region(&irq_rman,
173 irq_rman.rm_start, irq_rman.rm_end))
174 panic("nexus_probe irq_rman");
176 if (rman_init(&irq_rman)
177 || rman_manage_region(&irq_rman, irq_rman.rm_start, 1)
178 || rman_manage_region(&irq_rman, 3, irq_rman.rm_end))
179 panic("nexus_probe irq_rman");
184 * ISA DMA on PCI systems is implemented in the ISA part of each
185 * PCI->ISA bridge and the channels can be duplicated if there are
186 * multiple bridges. (eg: laptops with docking stations)
188 drq_rman.rm_start = 0;
194 drq_rman.rm_type = RMAN_ARRAY;
195 drq_rman.rm_descr = "DMA request lines";
196 /* XXX drq 0 not available on some machines */
197 if (rman_init(&drq_rman)
198 || rman_manage_region(&drq_rman,
199 drq_rman.rm_start, drq_rman.rm_end))
200 panic("nexus_probe drq_rman");
203 * However, IO ports and Memory truely are global at this level,
204 * as are APIC interrupts (however many IO APICS there turn out
205 * to be on large systems..)
207 port_rman.rm_start = 0;
208 port_rman.rm_end = 0xffff;
209 port_rman.rm_type = RMAN_ARRAY;
210 port_rman.rm_descr = "I/O ports";
211 if (rman_init(&port_rman)
212 || rman_manage_region(&port_rman, 0, 0xffff))
213 panic("nexus_probe port_rman");
215 mem_rman.rm_start = 0;
216 mem_rman.rm_end = ~0u;
217 mem_rman.rm_type = RMAN_ARRAY;
218 mem_rman.rm_descr = "I/O memory addresses";
219 if (rman_init(&mem_rman)
220 || rman_manage_region(&mem_rman, 0, ~0))
221 panic("nexus_probe mem_rman");
223 return bus_generic_probe(dev);
227 nexus_attach(device_t dev)
232 * First, deal with the children we know about already
234 bus_generic_attach(dev);
236 * And if we didn't see EISA or ISA on a pci bridge, create some
237 * connection points now so they show up "on motherboard".
239 if (!devclass_get_device(devclass_find("eisa"), 0)) {
240 child = BUS_ADD_CHILD(dev, 0, "eisa", 0);
242 panic("nexus_attach eisa");
243 device_probe_and_attach(child);
246 if (!devclass_get_device(devclass_find("mca"), 0)) {
247 child = BUS_ADD_CHILD(dev, 0, "mca", 0);
249 panic("nexus_probe mca");
250 device_probe_and_attach(child);
253 if (!devclass_get_device(devclass_find("isa"), 0)) {
254 child = BUS_ADD_CHILD(dev, 0, "isa", 0);
256 panic("nexus_attach isa");
257 device_probe_and_attach(child);
264 nexus_print_all_resources(device_t dev)
266 struct nexus_device *ndev = DEVTONX(dev);
267 struct resource_list *rl = &ndev->nx_resources;
270 if (SLIST_FIRST(rl) || ndev->nx_pcibus != -1)
271 retval += printf(" at");
273 retval += resource_list_print_type(rl, "port", SYS_RES_IOPORT, "%#lx");
274 retval += resource_list_print_type(rl, "iomem", SYS_RES_MEMORY, "%#lx");
275 retval += resource_list_print_type(rl, "irq", SYS_RES_IRQ, "%ld");
281 nexus_print_child(device_t bus, device_t child)
283 struct nexus_device *ndev = DEVTONX(child);
286 retval += bus_print_child_header(bus, child);
287 retval += nexus_print_all_resources(child);
288 if (ndev->nx_pcibus != -1)
289 retval += printf(" pcibus %d", ndev->nx_pcibus);
290 retval += printf(" on motherboard\n");
296 nexus_add_child(device_t bus, int order, const char *name, int unit)
299 struct nexus_device *ndev;
301 ndev = malloc(sizeof(struct nexus_device), M_NEXUSDEV, M_NOWAIT|M_ZERO);
304 resource_list_init(&ndev->nx_resources);
305 ndev->nx_pcibus = -1;
307 child = device_add_child_ordered(bus, order, name, unit);
309 /* should we free this in nexus_child_detached? */
310 device_set_ivars(child, ndev);
316 nexus_read_ivar(device_t dev, device_t child, int which, uintptr_t *result)
318 struct nexus_device *ndev = DEVTONX(child);
321 case NEXUS_IVAR_PCIBUS:
322 *result = ndev->nx_pcibus;
331 nexus_write_ivar(device_t dev, device_t child, int which, uintptr_t value)
333 struct nexus_device *ndev = DEVTONX(child);
336 case NEXUS_IVAR_PCIBUS:
337 ndev->nx_pcibus = value;
346 * Allocate a resource on behalf of child. NB: child is usually going to be a
347 * child of one of our descendants, not a direct child of nexus0.
348 * (Exceptions include npx.)
350 static struct resource *
351 nexus_alloc_resource(device_t bus, device_t child, int type, int *rid,
352 u_long start, u_long end, u_long count, u_int flags)
354 struct nexus_device *ndev = DEVTONX(child);
356 struct resource_list_entry *rle;
358 int needactivate = flags & RF_ACTIVE;
361 * If this is an allocation of the "default" range for a given RID, and
362 * we know what the resources for this device are (ie. they aren't maintained
363 * by a child bus), then work out the start/end values.
365 if ((start == 0UL) && (end == ~0UL) && (count == 1)) {
368 rle = resource_list_find(&ndev->nx_resources, type, *rid);
399 rv = rman_reserve_resource(rm, start, end, count, flags, child);
403 if (type == SYS_RES_MEMORY) {
404 rman_set_bustag(rv, I386_BUS_SPACE_MEM);
405 } else if (type == SYS_RES_IOPORT) {
406 rman_set_bustag(rv, I386_BUS_SPACE_IO);
408 rman_set_bushandle(rv, rv->r_start);
413 if ((type == SYS_RES_MEMORY || type == SYS_RES_IOPORT) &&
414 i386_bus_space_handle_alloc(rv->r_bustag, rv->r_start, count,
415 &rv->r_bushandle) != 0) {
416 rman_release_resource(rv);
422 if (bus_activate_resource(child, type, *rid, rv)) {
424 if (type == SYS_RES_MEMORY || type == SYS_RES_IOPORT) {
425 i386_bus_space_handle_free(rv->r_bustag,
426 rv->r_bushandle, rv->r_bushandle->bsh_sz);
429 rman_release_resource(rv);
438 nexus_activate_resource(device_t bus, device_t child, int type, int rid,
442 * If this is a memory resource, map it into the kernel.
444 if (rman_get_bustag(r) == I386_BUS_SPACE_MEM) {
447 if (rman_get_end(r) < 1024 * 1024) {
449 * The first 1Mb is mapped at KERNBASE.
451 vaddr = (caddr_t)(uintptr_t)(KERNBASE + rman_get_start(r));
457 paddr = rman_get_start(r);
458 psize = rman_get_size(r);
460 poffs = paddr - trunc_page(paddr);
461 vaddr = (caddr_t) pmap_mapdev(paddr-poffs, psize+poffs) + poffs;
463 rman_set_virtual(r, vaddr);
465 /* PC-98: the type of bus_space_handle_t is the structure. */
466 r->r_bushandle->bsh_base = (bus_addr_t) vaddr;
468 /* IBM-PC: the type of bus_space_handle_t is u_int */
469 rman_set_bushandle(r, (bus_space_handle_t) vaddr);
472 return (rman_activate_resource(r));
476 nexus_deactivate_resource(device_t bus, device_t child, int type, int rid,
480 * If this is a memory resource, unmap it.
482 if ((rman_get_bustag(r) == I386_BUS_SPACE_MEM) &&
483 (rman_get_end(r) >= 1024 * 1024)) {
486 psize = rman_get_size(r);
487 pmap_unmapdev((vm_offset_t)rman_get_virtual(r), psize);
490 return (rman_deactivate_resource(r));
494 nexus_release_resource(device_t bus, device_t child, int type, int rid,
497 if (rman_get_flags(r) & RF_ACTIVE) {
498 int error = bus_deactivate_resource(child, type, rid, r);
503 if (type == SYS_RES_MEMORY || type == SYS_RES_IOPORT) {
504 i386_bus_space_handle_free(r->r_bustag, r->r_bushandle,
505 r->r_bushandle->bsh_sz);
508 return (rman_release_resource(r));
512 * Currently this uses the really grody interface from kern/kern_intr.c
513 * (which really doesn't belong in kern/anything.c). Eventually, all of
514 * the code in kern_intr.c and machdep_intr.c should get moved here, since
515 * this is going to be the official interface.
518 nexus_setup_intr(device_t bus, device_t child, struct resource *irq,
519 int flags, void (*ihand)(void *), void *arg, void **cookiep)
525 /* somebody tried to setup an irq that failed to allocate! */
527 panic("nexus_setup_intr: NULL irq resource!");
530 if (irq->r_flags & RF_SHAREABLE)
535 driver = device_get_driver(child);
536 switch (flags & INTR_TYPE_MASK) {
552 printf("nexus: Warning: do not know what imask to use for INTR_TYPE_CLK\n");
558 panic("still using grody create_intr interface");
560 if (flags & INTR_FAST)
561 icflags |= INTR_FAST;
564 * We depend here on rman_activate_resource() being idempotent.
566 error = rman_activate_resource(irq);
570 *cookiep = inthand_add(device_get_nameunit(child), irq->r_start,
571 ihand, arg, mask, icflags);
572 if (*cookiep == NULL)
573 error = EINVAL; /* XXX ??? */
579 nexus_teardown_intr(device_t dev, device_t child, struct resource *r, void *ih)
581 return (inthand_remove(ih));
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);
603 device_printf(child, "type %d rid %d startp %p countp %p - got %p\n",
604 type, rid, startp, countp, rle);
608 *startp = rle->start;
610 *countp = rle->count;
615 nexus_delete_resource(device_t dev, device_t child, int type, int rid)
617 struct nexus_device *ndev = DEVTONX(child);
618 struct resource_list *rl = &ndev->nx_resources;
620 resource_list_delete(rl, type, rid);
624 * Placeholder which claims PnP 'devices' which describe system
627 static struct isa_pnp_id sysresource_ids[] = {
628 { 0x010cd041 /* PNP0c01 */, "System Memory" },
629 { 0x020cd041 /* PNP0c02 */, "System Resource" },
634 sysresource_probe(device_t dev)
638 if ((result = ISA_PNP_PROBE(device_get_parent(dev), dev, sysresource_ids)) >= 0) {
645 sysresource_attach(device_t dev)
650 static device_method_t sysresource_methods[] = {
651 /* Device interface */
652 DEVMETHOD(device_probe, sysresource_probe),
653 DEVMETHOD(device_attach, sysresource_attach),
654 DEVMETHOD(device_detach, bus_generic_detach),
655 DEVMETHOD(device_shutdown, bus_generic_shutdown),
656 DEVMETHOD(device_suspend, bus_generic_suspend),
657 DEVMETHOD(device_resume, bus_generic_resume),
661 static driver_t sysresource_driver = {
667 static devclass_t sysresource_devclass;
669 DRIVER_MODULE(sysresource, isa, sysresource_driver, sysresource_devclass, 0, 0);