2 * Copyright 1998 Massachusetts Institute of Technology
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5 * its documentation for any purpose and without fee is hereby
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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 $
33 * This code implements a `root nexus' for Intel Architecture
34 * machines. The function of the root nexus is to serve as an
35 * attachment point for both processors and buses, and to manage
36 * resources which are common to all of them. In particular,
37 * this code implements the core resource managers for interrupt
38 * requests, DMA requests (which rightfully should be a part of the
39 * ISA code but it's easier to do it here for now), I/O port addresses,
40 * and I/O memory address space.
43 #include <sys/param.h>
44 #include <sys/systm.h>
46 #include <sys/kernel.h>
47 #include <sys/malloc.h>
48 #include <sys/module.h>
50 #include <sys/interrupt.h>
51 #include <sys/machintr.h>
53 #include <machine/vmparam.h>
56 #include <machine/pmap.h>
58 #include <machine/nexusvar.h>
59 #include <machine/smp.h>
60 #include <machine/intr_machdep.h>
61 #include <machine_base/apic/ioapic.h>
62 #include <machine_base/apic/lapic.h>
66 static MALLOC_DEFINE(M_NEXUSDEV, "nexusdev", "Nexus device");
68 struct resource_list nx_resources;
72 #define DEVTONX(dev) ((struct nexus_device *)device_get_ivars(dev))
74 static struct rman irq_rman[MAXCPU], drq_rman, port_rman, mem_rman;
76 static int nexus_probe(device_t);
77 static int nexus_attach(device_t);
78 static int nexus_print_all_resources(device_t dev);
79 static int nexus_print_child(device_t, device_t);
80 static device_t nexus_add_child(device_t bus, device_t parent, int order,
81 const char *name, int unit);
82 static struct resource *nexus_alloc_resource(device_t, device_t, int, int *,
83 u_long, u_long, u_long, u_int, int);
84 static int nexus_read_ivar(device_t, device_t, int, uintptr_t *);
85 static int nexus_write_ivar(device_t, device_t, int, uintptr_t);
86 static int nexus_activate_resource(device_t, device_t, int, int,
88 static int nexus_deactivate_resource(device_t, device_t, int, int,
90 static int nexus_release_resource(device_t, device_t, int, int,
92 static int nexus_config_intr(device_t, device_t, int, enum intr_trigger,
94 static int nexus_setup_intr(device_t, device_t, struct resource *, int flags,
95 void (*)(void *), void *, void **, lwkt_serialize_t,
97 static int nexus_teardown_intr(device_t, device_t, struct resource *,
99 static int nexus_set_resource(device_t, device_t, int, int, u_long, u_long,
101 static int nexus_get_resource(device_t, device_t, int, int, u_long *, u_long *);
102 static void nexus_delete_resource(device_t, device_t, int, int);
104 static int nexus_alloc_msi(device_t, device_t, int, int, int *, int);
105 static int nexus_release_msi(device_t, device_t, int, int *, int);
106 static int nexus_map_msi(device_t, device_t, int, uint64_t *, uint32_t *, int);
107 static int nexus_alloc_msix(device_t, device_t, int *, int);
108 static int nexus_release_msix(device_t, device_t, int, int);
111 * The device_identify method will cause nexus to automatically associate
112 * and attach to the root bus.
114 static device_method_t nexus_methods[] = {
115 /* Device interface */
116 DEVMETHOD(device_identify, bus_generic_identify),
117 DEVMETHOD(device_probe, nexus_probe),
118 DEVMETHOD(device_attach, nexus_attach),
119 DEVMETHOD(device_detach, bus_generic_detach),
120 DEVMETHOD(device_shutdown, bus_generic_shutdown),
121 DEVMETHOD(device_suspend, bus_generic_suspend),
122 DEVMETHOD(device_resume, bus_generic_resume),
125 DEVMETHOD(bus_print_child, nexus_print_child),
126 DEVMETHOD(bus_add_child, nexus_add_child),
127 DEVMETHOD(bus_read_ivar, nexus_read_ivar),
128 DEVMETHOD(bus_write_ivar, nexus_write_ivar),
129 DEVMETHOD(bus_alloc_resource, nexus_alloc_resource),
130 DEVMETHOD(bus_release_resource, nexus_release_resource),
131 DEVMETHOD(bus_activate_resource, nexus_activate_resource),
132 DEVMETHOD(bus_deactivate_resource, nexus_deactivate_resource),
133 DEVMETHOD(bus_config_intr, nexus_config_intr),
134 DEVMETHOD(bus_setup_intr, nexus_setup_intr),
135 DEVMETHOD(bus_teardown_intr, nexus_teardown_intr),
136 DEVMETHOD(bus_set_resource, nexus_set_resource),
137 DEVMETHOD(bus_get_resource, nexus_get_resource),
138 DEVMETHOD(bus_delete_resource, nexus_delete_resource),
140 DEVMETHOD(pcib_alloc_msi, nexus_alloc_msi),
141 DEVMETHOD(pcib_release_msi, nexus_release_msi),
142 DEVMETHOD(pcib_map_msi, nexus_map_msi),
143 DEVMETHOD(pcib_alloc_msix, nexus_alloc_msix),
144 DEVMETHOD(pcib_release_msix, nexus_release_msix),
149 static driver_t nexus_driver = {
154 static devclass_t nexus_devclass;
156 DRIVER_MODULE(nexus, root, nexus_driver, nexus_devclass, NULL, NULL);
159 nexus_probe(device_t dev)
163 device_quiet(dev); /* suppress attach message for neatness */
165 for (cpuid = 0; cpuid < ncpus; ++cpuid) {
166 struct rman *rm = &irq_rman[cpuid];
169 rm->rm_end = IDT_HWI_VECTORS - 1;
170 rm->rm_type = RMAN_ARRAY;
171 rm->rm_descr = "Interrupt request lines";
173 if (rman_init(rm, cpuid))
174 panic("nexus_probe rman_init");
175 MachIntrABI.rman_setup(rm);
179 * ISA DMA on PCI systems is implemented in the ISA part of each
180 * PCI->ISA bridge and the channels can be duplicated if there are
181 * multiple bridges. (eg: laptops with docking stations)
183 drq_rman.rm_start = 0;
185 drq_rman.rm_type = RMAN_ARRAY;
186 drq_rman.rm_descr = "DMA request lines";
187 /* XXX drq 0 not available on some machines */
188 if (rman_init(&drq_rman, -1)
189 || rman_manage_region(&drq_rman,
190 drq_rman.rm_start, drq_rman.rm_end))
191 panic("nexus_probe drq_rman");
194 * However, IO ports and Memory truely are global at this level,
195 * as are APIC interrupts (however many IO APICS there turn out
196 * to be on large systems..)
198 port_rman.rm_start = 0;
199 port_rman.rm_end = 0xffff;
200 port_rman.rm_type = RMAN_ARRAY;
201 port_rman.rm_descr = "I/O ports";
202 if (rman_init(&port_rman, -1)
203 || rman_manage_region(&port_rman, 0, 0xffff))
204 panic("nexus_probe port_rman");
206 mem_rman.rm_start = 0;
207 mem_rman.rm_end = ~0u;
208 mem_rman.rm_type = RMAN_ARRAY;
209 mem_rman.rm_descr = "I/O memory addresses";
210 if (rman_init(&mem_rman, -1)
211 || rman_manage_region(&mem_rman, 0, ~0))
212 panic("nexus_probe mem_rman");
214 return bus_generic_probe(dev);
218 nexus_attach(device_t dev)
223 * First, let our child driver's identify any child devices that
224 * they can find. Once that is done attach any devices that we
228 bus_generic_probe(dev);
230 bus_generic_attach(dev);
233 * And if we didn't see ISA on a pci bridge, create a
234 * connection point now so it shows up "on motherboard".
236 if (!devclass_get_device(devclass_find("isa"), 0)) {
237 child = BUS_ADD_CHILD(dev, dev, 0, "isa", 0);
239 panic("nexus_attach isa");
240 device_probe_and_attach(child);
247 nexus_print_all_resources(device_t dev)
249 struct nexus_device *ndev = DEVTONX(dev);
250 struct resource_list *rl = &ndev->nx_resources;
253 if (SLIST_FIRST(rl) || ndev->nx_pcibus != -1)
254 retval += kprintf(" at");
256 retval += resource_list_print_type(rl, "port", SYS_RES_IOPORT, "%#lx");
257 retval += resource_list_print_type(rl, "iomem", SYS_RES_MEMORY, "%#lx");
258 retval += resource_list_print_type(rl, "irq", SYS_RES_IRQ, "%ld");
264 nexus_print_child(device_t bus, device_t child)
266 struct nexus_device *ndev = DEVTONX(child);
269 retval += bus_print_child_header(bus, child);
270 retval += nexus_print_all_resources(child);
271 if (ndev->nx_pcibus != -1)
272 retval += kprintf(" pcibus %d", ndev->nx_pcibus);
273 retval += kprintf(" on motherboard\n");
279 nexus_add_child(device_t bus, device_t parent, int order,
280 const char *name, int unit)
283 struct nexus_device *ndev;
285 ndev = kmalloc(sizeof(struct nexus_device), M_NEXUSDEV, M_INTWAIT|M_ZERO);
286 resource_list_init(&ndev->nx_resources);
287 ndev->nx_pcibus = -1;
289 child = device_add_child_ordered(parent, order, name, unit);
291 /* should we free this in nexus_child_detached? */
292 device_set_ivars(child, ndev);
298 nexus_read_ivar(device_t dev, device_t child, int which, uintptr_t *result)
300 struct nexus_device *ndev = DEVTONX(child);
303 case NEXUS_IVAR_PCIBUS:
304 *result = ndev->nx_pcibus;
313 nexus_write_ivar(device_t dev, device_t child, int which, uintptr_t value)
315 struct nexus_device *ndev = DEVTONX(child);
318 case NEXUS_IVAR_PCIBUS:
319 ndev->nx_pcibus = value;
328 * Allocate a resource on behalf of child. NB: child is usually going to be a
329 * child of one of our descendants, not a direct child of nexus0.
330 * (Exceptions include npx.)
332 static struct resource *
333 nexus_alloc_resource(device_t bus, device_t child, int type, int *rid,
334 u_long start, u_long end, u_long count, u_int flags, int cpuid)
336 struct nexus_device *ndev = DEVTONX(child);
338 struct resource_list_entry *rle;
340 int needactivate = flags & RF_ACTIVE;
343 * If this is an allocation of the "default" range for a given RID, and
344 * we know what the resources for this device are (ie. they aren't maintained
345 * by a child bus), then work out the start/end values.
347 if ((start == 0UL) && (end == ~0UL) && (count == 1)) {
350 rle = resource_list_find(&ndev->nx_resources, type, *rid);
363 KASSERT(cpuid >= 0 && cpuid < ncpus,
364 ("nexus invalid cpuid: %d", cpuid));
365 rm = &irq_rman[cpuid];
384 rv = rman_reserve_resource(rm, start, end, count, flags, child);
387 rman_set_rid(rv, *rid);
389 if (type == SYS_RES_MEMORY) {
390 rman_set_bustag(rv, I386_BUS_SPACE_MEM);
391 } else if (type == SYS_RES_IOPORT) {
392 rman_set_bustag(rv, I386_BUS_SPACE_IO);
393 rman_set_bushandle(rv, rv->r_start);
397 if (bus_activate_resource(child, type, *rid, rv)) {
398 rman_release_resource(rv);
407 nexus_activate_resource(device_t bus, device_t child, int type, int rid,
411 * If this is a memory resource, map it into the kernel.
413 if (rman_get_bustag(r) == I386_BUS_SPACE_MEM) {
416 if (rman_get_end(r) < 1024 * 1024) {
418 * The first 1Mb is mapped at KERNBASE.
420 vaddr = (caddr_t)(uintptr_t)(KERNBASE + rman_get_start(r));
426 paddr = rman_get_start(r);
427 psize = rman_get_size(r);
429 poffs = paddr - trunc_page(paddr);
430 vaddr = (caddr_t) pmap_mapdev(paddr-poffs, psize+poffs) + poffs;
432 rman_set_virtual(r, vaddr);
433 /* IBM-PC: the type of bus_space_handle_t is u_int */
434 rman_set_bushandle(r, (bus_space_handle_t) vaddr);
436 return (rman_activate_resource(r));
440 nexus_deactivate_resource(device_t bus, device_t child, int type, int rid,
444 * If this is a memory resource, unmap it.
446 if ((rman_get_bustag(r) == I386_BUS_SPACE_MEM) &&
447 (rman_get_end(r) >= 1024 * 1024)) {
450 psize = rman_get_size(r);
451 pmap_unmapdev((vm_offset_t)rman_get_virtual(r), psize);
454 return (rman_deactivate_resource(r));
458 nexus_release_resource(device_t bus, device_t child, int type, int rid,
461 if (rman_get_flags(r) & RF_ACTIVE) {
462 int error = bus_deactivate_resource(child, type, rid, r);
466 return (rman_release_resource(r));
470 nexus_config_intr(device_t bus, device_t chile, int irq,
471 enum intr_trigger trig, enum intr_polarity pola)
473 machintr_legacy_intr_config(irq, trig, pola);
478 * Currently this uses the really grody interface from kern/kern_intr.c
479 * (which really doesn't belong in kern/anything.c). Eventually, all of
480 * the code in kern_intr.c and machdep_intr.c should get moved here, since
481 * this is going to be the official interface.
484 nexus_setup_intr(device_t bus, device_t child, struct resource *irq,
485 int flags, void (*ihand)(void *), void *arg, void **cookiep,
486 lwkt_serialize_t serializer, const char *desc)
490 /* somebody tried to setup an irq that failed to allocate! */
492 panic("nexus_setup_intr: NULL irq resource!");
496 if ((irq->r_flags & RF_SHAREABLE) == 0)
497 icflags |= INTR_EXCL;
500 * We depend here on rman_activate_resource() being idempotent.
502 error = rman_activate_resource(irq);
506 /* Use device name, if description is not specified */
508 desc = device_get_nameunit(child);
511 * XXX cast the interrupt handler function to an inthand2_t. The
512 * difference is that an additional frame argument is passed which
513 * we do not currently want to expose the BUS subsystem to.
515 *cookiep = register_int(irq->r_start, (inthand2_t *)ihand, arg,
516 desc, serializer, icflags, rman_get_cpuid(irq));
517 if (*cookiep == NULL)
523 nexus_teardown_intr(device_t dev, device_t child, struct resource *r, void *ih)
526 unregister_int(ih, rman_get_cpuid(r));
533 nexus_set_resource(device_t dev, device_t child, int type, int rid,
534 u_long start, u_long count, int cpuid)
536 struct nexus_device *ndev = DEVTONX(child);
537 struct resource_list *rl = &ndev->nx_resources;
539 /* XXX this should return a success/failure indicator */
540 resource_list_add(rl, type, rid, start, start + count - 1, count,
546 nexus_get_resource(device_t dev, device_t child, int type, int rid, u_long *startp, u_long *countp)
548 struct nexus_device *ndev = DEVTONX(child);
549 struct resource_list *rl = &ndev->nx_resources;
550 struct resource_list_entry *rle;
552 rle = resource_list_find(rl, type, rid);
553 device_printf(child, "type %d rid %d startp %p countp %p - got %p\n",
554 type, rid, startp, countp, rle);
558 *startp = rle->start;
560 *countp = rle->count;
565 nexus_delete_resource(device_t dev, device_t child, int type, int rid)
567 struct nexus_device *ndev = DEVTONX(child);
568 struct resource_list *rl = &ndev->nx_resources;
570 resource_list_delete(rl, type, rid);
574 nexus_alloc_msi(device_t dev, device_t child, int count, int maxcount,
575 int *irqs, int cpuid)
580 return MachIntrABI.msi_alloc(irqs, count, cpuid);
584 nexus_release_msi(device_t dev, device_t child, int count, int *irqs, int cpuid)
586 KKASSERT(lapic_enable);
587 MachIntrABI.msi_release(irqs, count, cpuid);
592 nexus_map_msi(device_t dev, device_t child, int irq, uint64_t *addr,
593 uint32_t *data, int cpuid)
595 KKASSERT(lapic_enable);
596 MachIntrABI.msi_map(irq, addr, data, cpuid);
601 nexus_alloc_msix(device_t dev, device_t child, int *irq, int cpuid)
606 return MachIntrABI.msix_alloc(irq, cpuid);
610 nexus_release_msix(device_t dev, device_t child, int irq, int cpuid)
612 KKASSERT(lapic_enable);
613 MachIntrABI.msix_release(irq, cpuid);