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
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 1.29 2006/12/23 00:27:03 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.
44 #include <sys/param.h>
45 #include <sys/systm.h>
47 #include <sys/kernel.h>
48 #include <sys/malloc.h>
49 #include <sys/module.h>
52 #include <machine/vmparam.h>
55 #include <machine/pmap.h>
57 #include <machine/nexusvar.h>
58 #include <machine/smp.h>
59 #include <machine_base/apic/mpapic.h>
60 #include <machine_base/isa/intr_machdep.h>
62 static MALLOC_DEFINE(M_NEXUSDEV, "nexusdev", "Nexus device");
64 struct resource_list nx_resources;
68 #define DEVTONX(dev) ((struct nexus_device *)device_get_ivars(dev))
70 static struct rman irq_rman, drq_rman, port_rman, mem_rman;
72 static int nexus_probe(device_t);
73 static int nexus_attach(device_t);
74 static int nexus_print_all_resources(device_t dev);
75 static int nexus_print_child(device_t, device_t);
76 static device_t nexus_add_child(device_t bus, device_t parent, int order,
77 const char *name, int unit);
78 static struct resource *nexus_alloc_resource(device_t, device_t, int, int *,
79 u_long, u_long, u_long, u_int);
80 static int nexus_read_ivar(device_t, device_t, int, uintptr_t *);
81 static int nexus_write_ivar(device_t, device_t, int, uintptr_t);
82 static int nexus_activate_resource(device_t, device_t, int, int,
84 static int nexus_deactivate_resource(device_t, device_t, int, int,
86 static int nexus_release_resource(device_t, device_t, int, int,
88 static int nexus_setup_intr(device_t, device_t, struct resource *, int flags,
89 void (*)(void *), void *,
90 void **, lwkt_serialize_t);
91 static int nexus_teardown_intr(device_t, device_t, struct resource *,
93 static int nexus_set_resource(device_t, device_t, int, int, u_long, u_long);
94 static int nexus_get_resource(device_t, device_t, int, int, u_long *, u_long *);
95 static void nexus_delete_resource(device_t, device_t, int, int);
98 * The device_identify method will cause nexus to automatically associate
99 * and attach to the root bus.
101 static device_method_t nexus_methods[] = {
102 /* Device interface */
103 DEVMETHOD(device_identify, bus_generic_identify),
104 DEVMETHOD(device_probe, nexus_probe),
105 DEVMETHOD(device_attach, nexus_attach),
106 DEVMETHOD(device_detach, bus_generic_detach),
107 DEVMETHOD(device_shutdown, bus_generic_shutdown),
108 DEVMETHOD(device_suspend, bus_generic_suspend),
109 DEVMETHOD(device_resume, bus_generic_resume),
112 DEVMETHOD(bus_print_child, nexus_print_child),
113 DEVMETHOD(bus_add_child, nexus_add_child),
114 DEVMETHOD(bus_read_ivar, nexus_read_ivar),
115 DEVMETHOD(bus_write_ivar, nexus_write_ivar),
116 DEVMETHOD(bus_alloc_resource, nexus_alloc_resource),
117 DEVMETHOD(bus_release_resource, nexus_release_resource),
118 DEVMETHOD(bus_activate_resource, nexus_activate_resource),
119 DEVMETHOD(bus_deactivate_resource, nexus_deactivate_resource),
120 DEVMETHOD(bus_setup_intr, nexus_setup_intr),
121 DEVMETHOD(bus_teardown_intr, nexus_teardown_intr),
122 DEVMETHOD(bus_set_resource, nexus_set_resource),
123 DEVMETHOD(bus_get_resource, nexus_get_resource),
124 DEVMETHOD(bus_delete_resource, nexus_delete_resource),
129 static driver_t nexus_driver = {
134 static devclass_t nexus_devclass;
136 DRIVER_MODULE(nexus, root, nexus_driver, nexus_devclass, 0, 0);
139 nexus_probe(device_t dev)
141 device_quiet(dev); /* suppress attach message for neatness */
144 * IRQ's are on the mainboard on old systems, but on the ISA part
145 * of PCI->ISA bridges. There would be multiple sets of IRQs on
146 * multi-ISA-bus systems. PCI interrupts are routed to the ISA
147 * component, so in a way, PCI can be a partial child of an ISA bus(!).
148 * APIC interrupts are global though.
149 * In the non-APIC case, disallow the use of IRQ 2.
151 irq_rman.rm_start = 0;
152 irq_rman.rm_type = RMAN_ARRAY;
153 irq_rman.rm_descr = "Interrupt request lines";
155 irq_rman.rm_end = APIC_INTMAPSIZE - 1;
156 if (rman_init(&irq_rman)
157 || rman_manage_region(&irq_rman,
158 irq_rman.rm_start, irq_rman.rm_end))
159 panic("nexus_probe irq_rman");
161 irq_rman.rm_end = 15;
162 if (rman_init(&irq_rman)
163 || rman_manage_region(&irq_rman, irq_rman.rm_start, 1)
164 || rman_manage_region(&irq_rman, 3, irq_rman.rm_end))
165 panic("nexus_probe irq_rman");
169 * ISA DMA on PCI systems is implemented in the ISA part of each
170 * PCI->ISA bridge and the channels can be duplicated if there are
171 * multiple bridges. (eg: laptops with docking stations)
173 drq_rman.rm_start = 0;
175 drq_rman.rm_type = RMAN_ARRAY;
176 drq_rman.rm_descr = "DMA request lines";
177 /* XXX drq 0 not available on some machines */
178 if (rman_init(&drq_rman)
179 || rman_manage_region(&drq_rman,
180 drq_rman.rm_start, drq_rman.rm_end))
181 panic("nexus_probe drq_rman");
184 * However, IO ports and Memory truely are global at this level,
185 * as are APIC interrupts (however many IO APICS there turn out
186 * to be on large systems..)
188 port_rman.rm_start = 0;
189 port_rman.rm_end = 0xffff;
190 port_rman.rm_type = RMAN_ARRAY;
191 port_rman.rm_descr = "I/O ports";
192 if (rman_init(&port_rman)
193 || rman_manage_region(&port_rman, 0, 0xffff))
194 panic("nexus_probe port_rman");
196 mem_rman.rm_start = 0;
197 mem_rman.rm_end = ~0u;
198 mem_rman.rm_type = RMAN_ARRAY;
199 mem_rman.rm_descr = "I/O memory addresses";
200 if (rman_init(&mem_rman)
201 || rman_manage_region(&mem_rman, 0, ~0))
202 panic("nexus_probe mem_rman");
204 return bus_generic_probe(dev);
208 nexus_attach(device_t dev)
213 * First, let our child driver's identify any child devices that
214 * they can find. Once that is done attach any devices that we
218 bus_generic_probe(dev);
220 bus_generic_attach(dev);
223 * And if we didn't see EISA or ISA on a pci bridge, create some
224 * connection points now so they show up "on motherboard".
226 if (!devclass_get_device(devclass_find("eisa"), 0)) {
227 child = BUS_ADD_CHILD(dev, dev, 0, "eisa", 0);
229 panic("nexus_attach eisa");
230 device_probe_and_attach(child);
232 if (!devclass_get_device(devclass_find("isa"), 0)) {
233 child = BUS_ADD_CHILD(dev, dev, 0, "isa", 0);
235 panic("nexus_attach isa");
236 device_probe_and_attach(child);
243 nexus_print_all_resources(device_t dev)
245 struct nexus_device *ndev = DEVTONX(dev);
246 struct resource_list *rl = &ndev->nx_resources;
249 if (SLIST_FIRST(rl) || ndev->nx_pcibus != -1)
250 retval += kprintf(" at");
252 retval += resource_list_print_type(rl, "port", SYS_RES_IOPORT, "%#lx");
253 retval += resource_list_print_type(rl, "iomem", SYS_RES_MEMORY, "%#lx");
254 retval += resource_list_print_type(rl, "irq", SYS_RES_IRQ, "%ld");
260 nexus_print_child(device_t bus, device_t child)
262 struct nexus_device *ndev = DEVTONX(child);
265 retval += bus_print_child_header(bus, child);
266 retval += nexus_print_all_resources(child);
267 if (ndev->nx_pcibus != -1)
268 retval += kprintf(" pcibus %d", ndev->nx_pcibus);
269 retval += kprintf(" on motherboard\n");
275 nexus_add_child(device_t bus, device_t parent, int order,
276 const char *name, int unit)
279 struct nexus_device *ndev;
281 ndev = kmalloc(sizeof(struct nexus_device), M_NEXUSDEV, M_INTWAIT|M_ZERO);
284 resource_list_init(&ndev->nx_resources);
285 ndev->nx_pcibus = -1;
287 child = device_add_child_ordered(parent, order, name, unit);
289 /* should we free this in nexus_child_detached? */
290 device_set_ivars(child, ndev);
296 nexus_read_ivar(device_t dev, device_t child, int which, uintptr_t *result)
298 struct nexus_device *ndev = DEVTONX(child);
301 case NEXUS_IVAR_PCIBUS:
302 *result = ndev->nx_pcibus;
311 nexus_write_ivar(device_t dev, device_t child, int which, uintptr_t value)
313 struct nexus_device *ndev = DEVTONX(child);
316 case NEXUS_IVAR_PCIBUS:
317 ndev->nx_pcibus = value;
326 * Allocate a resource on behalf of child. NB: child is usually going to be a
327 * child of one of our descendants, not a direct child of nexus0.
328 * (Exceptions include npx.)
330 static struct resource *
331 nexus_alloc_resource(device_t bus, device_t child, int type, int *rid,
332 u_long start, u_long end, u_long count, u_int flags)
334 struct nexus_device *ndev = DEVTONX(child);
336 struct resource_list_entry *rle;
338 int needactivate = flags & RF_ACTIVE;
341 * If this is an allocation of the "default" range for a given RID, and
342 * we know what the resources for this device are (ie. they aren't maintained
343 * by a child bus), then work out the start/end values.
345 if ((start == 0UL) && (end == ~0UL) && (count == 1)) {
348 rle = resource_list_find(&ndev->nx_resources, type, *rid);
379 rv = rman_reserve_resource(rm, start, end, count, flags, child);
383 if (type == SYS_RES_MEMORY) {
384 rman_set_bustag(rv, I386_BUS_SPACE_MEM);
385 } else if (type == SYS_RES_IOPORT) {
386 rman_set_bustag(rv, I386_BUS_SPACE_IO);
387 rman_set_bushandle(rv, rv->r_start);
391 if (bus_activate_resource(child, type, *rid, rv)) {
392 rman_release_resource(rv);
401 nexus_activate_resource(device_t bus, device_t child, int type, int rid,
405 * If this is a memory resource, map it into the kernel.
407 if (rman_get_bustag(r) == I386_BUS_SPACE_MEM) {
410 if (rman_get_end(r) < 1024 * 1024) {
412 * The first 1Mb is mapped at KERNBASE.
414 vaddr = (caddr_t)(uintptr_t)(KERNBASE + rman_get_start(r));
420 paddr = rman_get_start(r);
421 psize = rman_get_size(r);
423 poffs = paddr - trunc_page(paddr);
424 vaddr = (caddr_t) pmap_mapdev(paddr-poffs, psize+poffs) + poffs;
426 rman_set_virtual(r, vaddr);
427 /* IBM-PC: the type of bus_space_handle_t is u_int */
428 rman_set_bushandle(r, (bus_space_handle_t) vaddr);
430 return (rman_activate_resource(r));
434 nexus_deactivate_resource(device_t bus, device_t child, int type, int rid,
438 * If this is a memory resource, unmap it.
440 if ((rman_get_bustag(r) == I386_BUS_SPACE_MEM) &&
441 (rman_get_end(r) >= 1024 * 1024)) {
444 psize = rman_get_size(r);
445 pmap_unmapdev((vm_offset_t)rman_get_virtual(r), psize);
448 return (rman_deactivate_resource(r));
452 nexus_release_resource(device_t bus, device_t child, int type, int rid,
455 if (rman_get_flags(r) & RF_ACTIVE) {
456 int error = bus_deactivate_resource(child, type, rid, r);
460 return (rman_release_resource(r));
464 * Currently this uses the really grody interface from kern/kern_intr.c
465 * (which really doesn't belong in kern/anything.c). Eventually, all of
466 * the code in kern_intr.c and machdep_intr.c should get moved here, since
467 * this is going to be the official interface.
470 nexus_setup_intr(device_t bus, device_t child, struct resource *irq,
471 int flags, void (*ihand)(void *), void *arg,
472 void **cookiep, lwkt_serialize_t serializer)
477 /* somebody tried to setup an irq that failed to allocate! */
479 panic("nexus_setup_intr: NULL irq resource!");
483 if ((irq->r_flags & RF_SHAREABLE) == 0)
484 icflags |= INTR_EXCL;
486 driver = device_get_driver(child);
489 * We depend here on rman_activate_resource() being idempotent.
491 error = rman_activate_resource(irq);
496 * XXX cast the interrupt handler function to an inthand2_t. The
497 * difference is that an additional frame argument is passed which
498 * we do not currently want to expose the BUS subsystem to.
500 *cookiep = register_int(irq->r_start, (inthand2_t *)ihand, arg,
501 device_get_nameunit(child), serializer,
503 if (*cookiep == NULL)
509 nexus_teardown_intr(device_t dev, device_t child, struct resource *r, void *ih)
519 nexus_set_resource(device_t dev, device_t child, int type, int rid, u_long start, u_long count)
521 struct nexus_device *ndev = DEVTONX(child);
522 struct resource_list *rl = &ndev->nx_resources;
524 /* XXX this should return a success/failure indicator */
525 resource_list_add(rl, type, rid, start, start + count - 1, count);
530 nexus_get_resource(device_t dev, device_t child, int type, int rid, u_long *startp, u_long *countp)
532 struct nexus_device *ndev = DEVTONX(child);
533 struct resource_list *rl = &ndev->nx_resources;
534 struct resource_list_entry *rle;
536 rle = resource_list_find(rl, type, rid);
537 device_printf(child, "type %d rid %d startp %p countp %p - got %p\n",
538 type, rid, startp, countp, rle);
542 *startp = rle->start;
544 *countp = rle->count;
549 nexus_delete_resource(device_t dev, device_t child, int type, int rid)
551 struct nexus_device *ndev = DEVTONX(child);
552 struct resource_list *rl = &ndev->nx_resources;
554 resource_list_delete(rl, type, rid);