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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13 * purpose. It is provided "as is" without express or implied
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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,
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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/platform/pc32/i386/nexus.c,v 1.5 2004/01/13 18:45:37 joerg 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>
68 #include <pc98/pc98/pc98.h>
70 #include <bus/isa/i386/isa.h>
72 #include <i386/isa/intr_machdep.h>
74 static MALLOC_DEFINE(M_NEXUSDEV, "nexusdev", "Nexus device");
76 struct resource_list nx_resources;
80 #define DEVTONX(dev) ((struct nexus_device *)device_get_ivars(dev))
82 static struct rman irq_rman, drq_rman, port_rman, mem_rman;
84 static int nexus_probe(device_t);
85 static int nexus_attach(device_t);
86 static int nexus_print_all_resources(device_t dev);
87 static int nexus_print_child(device_t, device_t);
88 static device_t nexus_add_child(device_t bus, int order, const char *name,
90 static struct resource *nexus_alloc_resource(device_t, device_t, int, int *,
91 u_long, u_long, u_long, u_int);
92 static int nexus_read_ivar(device_t, device_t, int, uintptr_t *);
93 static int nexus_write_ivar(device_t, device_t, int, uintptr_t);
94 static int nexus_activate_resource(device_t, device_t, int, int,
96 static int nexus_deactivate_resource(device_t, device_t, int, int,
98 static int nexus_release_resource(device_t, device_t, int, int,
100 static int nexus_setup_intr(device_t, device_t, struct resource *, int flags,
101 void (*)(void *), void *, void **);
102 static int nexus_teardown_intr(device_t, device_t, struct resource *,
104 static int nexus_set_resource(device_t, device_t, int, int, u_long, u_long);
105 static int nexus_get_resource(device_t, device_t, int, int, u_long *, u_long *);
106 static void nexus_delete_resource(device_t, device_t, int, int);
108 static device_method_t nexus_methods[] = {
109 /* Device interface */
110 DEVMETHOD(device_probe, nexus_probe),
111 DEVMETHOD(device_attach, nexus_attach),
112 DEVMETHOD(device_detach, bus_generic_detach),
113 DEVMETHOD(device_shutdown, bus_generic_shutdown),
114 DEVMETHOD(device_suspend, bus_generic_suspend),
115 DEVMETHOD(device_resume, bus_generic_resume),
118 DEVMETHOD(bus_print_child, nexus_print_child),
119 DEVMETHOD(bus_add_child, nexus_add_child),
120 DEVMETHOD(bus_read_ivar, nexus_read_ivar),
121 DEVMETHOD(bus_write_ivar, nexus_write_ivar),
122 DEVMETHOD(bus_alloc_resource, nexus_alloc_resource),
123 DEVMETHOD(bus_release_resource, nexus_release_resource),
124 DEVMETHOD(bus_activate_resource, nexus_activate_resource),
125 DEVMETHOD(bus_deactivate_resource, nexus_deactivate_resource),
126 DEVMETHOD(bus_setup_intr, nexus_setup_intr),
127 DEVMETHOD(bus_teardown_intr, nexus_teardown_intr),
128 DEVMETHOD(bus_set_resource, nexus_set_resource),
129 DEVMETHOD(bus_get_resource, nexus_get_resource),
130 DEVMETHOD(bus_delete_resource, nexus_delete_resource),
135 static driver_t nexus_driver = {
140 static devclass_t nexus_devclass;
142 DRIVER_MODULE(nexus, root, nexus_driver, nexus_devclass, 0, 0);
145 nexus_probe(device_t dev)
148 device_quiet(dev); /* suppress attach message for neatness */
151 * IRQ's are on the mainboard on old systems, but on the ISA part
152 * of PCI->ISA bridges. There would be multiple sets of IRQs on
153 * multi-ISA-bus systems. PCI interrupts are routed to the ISA
154 * component, so in a way, PCI can be a partial child of an ISA bus(!).
155 * APIC interrupts are global though.
156 * In the non-APIC case, disallow the use of IRQ 2.
158 irq_rman.rm_start = 0;
159 irq_rman.rm_type = RMAN_ARRAY;
160 irq_rman.rm_descr = "Interrupt request lines";
162 irq_rman.rm_end = APIC_INTMAPSIZE - 1;
163 if (rman_init(&irq_rman)
164 || rman_manage_region(&irq_rman,
165 irq_rman.rm_start, irq_rman.rm_end))
166 panic("nexus_probe irq_rman");
168 irq_rman.rm_end = 15;
170 if (rman_init(&irq_rman)
171 || rman_manage_region(&irq_rman,
172 irq_rman.rm_start, irq_rman.rm_end))
173 panic("nexus_probe irq_rman");
175 if (rman_init(&irq_rman)
176 || rman_manage_region(&irq_rman, irq_rman.rm_start, 1)
177 || rman_manage_region(&irq_rman, 3, irq_rman.rm_end))
178 panic("nexus_probe irq_rman");
183 * ISA DMA on PCI systems is implemented in the ISA part of each
184 * PCI->ISA bridge and the channels can be duplicated if there are
185 * multiple bridges. (eg: laptops with docking stations)
187 drq_rman.rm_start = 0;
193 drq_rman.rm_type = RMAN_ARRAY;
194 drq_rman.rm_descr = "DMA request lines";
195 /* XXX drq 0 not available on some machines */
196 if (rman_init(&drq_rman)
197 || rman_manage_region(&drq_rman,
198 drq_rman.rm_start, drq_rman.rm_end))
199 panic("nexus_probe drq_rman");
202 * However, IO ports and Memory truely are global at this level,
203 * as are APIC interrupts (however many IO APICS there turn out
204 * to be on large systems..)
206 port_rman.rm_start = 0;
207 port_rman.rm_end = 0xffff;
208 port_rman.rm_type = RMAN_ARRAY;
209 port_rman.rm_descr = "I/O ports";
210 if (rman_init(&port_rman)
211 || rman_manage_region(&port_rman, 0, 0xffff))
212 panic("nexus_probe port_rman");
214 mem_rman.rm_start = 0;
215 mem_rman.rm_end = ~0u;
216 mem_rman.rm_type = RMAN_ARRAY;
217 mem_rman.rm_descr = "I/O memory addresses";
218 if (rman_init(&mem_rman)
219 || rman_manage_region(&mem_rman, 0, ~0))
220 panic("nexus_probe mem_rman");
222 return bus_generic_probe(dev);
226 nexus_attach(device_t dev)
231 * First, deal with the children we know about already
233 bus_generic_attach(dev);
235 * And if we didn't see EISA or ISA on a pci bridge, create some
236 * connection points now so they show up "on motherboard".
238 if (!devclass_get_device(devclass_find("eisa"), 0)) {
239 child = BUS_ADD_CHILD(dev, 0, "eisa", 0);
241 panic("nexus_attach eisa");
242 device_probe_and_attach(child);
245 if (!devclass_get_device(devclass_find("mca"), 0)) {
246 child = BUS_ADD_CHILD(dev, 0, "mca", 0);
248 panic("nexus_probe mca");
249 device_probe_and_attach(child);
252 if (!devclass_get_device(devclass_find("isa"), 0)) {
253 child = BUS_ADD_CHILD(dev, 0, "isa", 0);
255 panic("nexus_attach isa");
256 device_probe_and_attach(child);
263 nexus_print_all_resources(device_t dev)
265 struct nexus_device *ndev = DEVTONX(dev);
266 struct resource_list *rl = &ndev->nx_resources;
269 if (SLIST_FIRST(rl) || ndev->nx_pcibus != -1)
270 retval += printf(" at");
272 retval += resource_list_print_type(rl, "port", SYS_RES_IOPORT, "%#lx");
273 retval += resource_list_print_type(rl, "iomem", SYS_RES_MEMORY, "%#lx");
274 retval += resource_list_print_type(rl, "irq", SYS_RES_IRQ, "%ld");
280 nexus_print_child(device_t bus, device_t child)
282 struct nexus_device *ndev = DEVTONX(child);
285 retval += bus_print_child_header(bus, child);
286 retval += nexus_print_all_resources(child);
287 if (ndev->nx_pcibus != -1)
288 retval += printf(" pcibus %d", ndev->nx_pcibus);
289 retval += printf(" on motherboard\n");
295 nexus_add_child(device_t bus, int order, const char *name, int unit)
298 struct nexus_device *ndev;
300 ndev = malloc(sizeof(struct nexus_device), M_NEXUSDEV, M_NOWAIT|M_ZERO);
303 resource_list_init(&ndev->nx_resources);
304 ndev->nx_pcibus = -1;
306 child = device_add_child_ordered(bus, order, name, unit);
308 /* should we free this in nexus_child_detached? */
309 device_set_ivars(child, ndev);
315 nexus_read_ivar(device_t dev, device_t child, int which, uintptr_t *result)
317 struct nexus_device *ndev = DEVTONX(child);
320 case NEXUS_IVAR_PCIBUS:
321 *result = ndev->nx_pcibus;
330 nexus_write_ivar(device_t dev, device_t child, int which, uintptr_t value)
332 struct nexus_device *ndev = DEVTONX(child);
335 case NEXUS_IVAR_PCIBUS:
336 ndev->nx_pcibus = value;
345 * Allocate a resource on behalf of child. NB: child is usually going to be a
346 * child of one of our descendants, not a direct child of nexus0.
347 * (Exceptions include npx.)
349 static struct resource *
350 nexus_alloc_resource(device_t bus, device_t child, int type, int *rid,
351 u_long start, u_long end, u_long count, u_int flags)
353 struct nexus_device *ndev = DEVTONX(child);
355 struct resource_list_entry *rle;
357 int needactivate = flags & RF_ACTIVE;
360 * If this is an allocation of the "default" range for a given RID, and
361 * we know what the resources for this device are (ie. they aren't maintained
362 * by a child bus), then work out the start/end values.
364 if ((start == 0UL) && (end == ~0UL) && (count == 1)) {
367 rle = resource_list_find(&ndev->nx_resources, type, *rid);
398 rv = rman_reserve_resource(rm, start, end, count, flags, child);
402 if (type == SYS_RES_MEMORY) {
403 rman_set_bustag(rv, I386_BUS_SPACE_MEM);
404 } else if (type == SYS_RES_IOPORT) {
405 rman_set_bustag(rv, I386_BUS_SPACE_IO);
407 rman_set_bushandle(rv, rv->r_start);
412 if ((type == SYS_RES_MEMORY || type == SYS_RES_IOPORT) &&
413 i386_bus_space_handle_alloc(rv->r_bustag, rv->r_start, count,
414 &rv->r_bushandle) != 0) {
415 rman_release_resource(rv);
421 if (bus_activate_resource(child, type, *rid, rv)) {
423 if (type == SYS_RES_MEMORY || type == SYS_RES_IOPORT) {
424 i386_bus_space_handle_free(rv->r_bustag,
425 rv->r_bushandle, rv->r_bushandle->bsh_sz);
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);
464 /* PC-98: the type of bus_space_handle_t is the structure. */
465 r->r_bushandle->bsh_base = (bus_addr_t) vaddr;
467 /* IBM-PC: the type of bus_space_handle_t is u_int */
468 rman_set_bushandle(r, (bus_space_handle_t) vaddr);
471 return (rman_activate_resource(r));
475 nexus_deactivate_resource(device_t bus, device_t child, int type, int rid,
479 * If this is a memory resource, unmap it.
481 if ((rman_get_bustag(r) == I386_BUS_SPACE_MEM) &&
482 (rman_get_end(r) >= 1024 * 1024)) {
485 psize = rman_get_size(r);
486 pmap_unmapdev((vm_offset_t)rman_get_virtual(r), psize);
489 return (rman_deactivate_resource(r));
493 nexus_release_resource(device_t bus, device_t child, int type, int rid,
496 if (rman_get_flags(r) & RF_ACTIVE) {
497 int error = bus_deactivate_resource(child, type, rid, r);
502 if (type == SYS_RES_MEMORY || type == SYS_RES_IOPORT) {
503 i386_bus_space_handle_free(r->r_bustag, r->r_bushandle,
504 r->r_bushandle->bsh_sz);
507 return (rman_release_resource(r));
511 * Currently this uses the really grody interface from kern/kern_intr.c
512 * (which really doesn't belong in kern/anything.c). Eventually, all of
513 * the code in kern_intr.c and machdep_intr.c should get moved here, since
514 * this is going to be the official interface.
517 nexus_setup_intr(device_t bus, device_t child, struct resource *irq,
518 int flags, void (*ihand)(void *), void *arg, void **cookiep)
524 /* somebody tried to setup an irq that failed to allocate! */
526 panic("nexus_setup_intr: NULL irq resource!");
529 if (irq->r_flags & RF_SHAREABLE)
534 driver = device_get_driver(child);
535 switch (flags & ~INTR_TYPE_FAST) {
552 panic("still using grody create_intr interface");
554 if (flags & INTR_TYPE_FAST)
555 icflags |= INTR_FAST;
558 * We depend here on rman_activate_resource() being idempotent.
560 error = rman_activate_resource(irq);
564 *cookiep = inthand_add(device_get_nameunit(child), irq->r_start,
565 ihand, arg, mask, icflags);
566 if (*cookiep == NULL)
567 error = EINVAL; /* XXX ??? */
573 nexus_teardown_intr(device_t dev, device_t child, struct resource *r, void *ih)
575 return (inthand_remove(ih));
579 nexus_set_resource(device_t dev, device_t child, int type, int rid, u_long start, u_long count)
581 struct nexus_device *ndev = DEVTONX(child);
582 struct resource_list *rl = &ndev->nx_resources;
584 /* XXX this should return a success/failure indicator */
585 resource_list_add(rl, type, rid, start, start + count - 1, count);
590 nexus_get_resource(device_t dev, device_t child, int type, int rid, u_long *startp, u_long *countp)
592 struct nexus_device *ndev = DEVTONX(child);
593 struct resource_list *rl = &ndev->nx_resources;
594 struct resource_list_entry *rle;
596 rle = resource_list_find(rl, type, rid);
597 device_printf(child, "type %d rid %d startp %p countp %p - got %p\n",
598 type, rid, startp, countp, rle);
602 *startp = rle->start;
604 *countp = rle->count;
609 nexus_delete_resource(device_t dev, device_t child, int type, int rid)
611 struct nexus_device *ndev = DEVTONX(child);
612 struct resource_list *rl = &ndev->nx_resources;
614 resource_list_delete(rl, type, rid);