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
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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>
51 #include <machine/vmparam.h>
54 #include <machine/pmap.h>
56 #include <machine/nexusvar.h>
57 #include <machine/smp.h>
58 #include <machine_base/apic/mpapic.h>
59 #include <machine_base/isa/intr_machdep.h>
61 #include <bus/pci/pcivar.h>
62 #include <bus/pci/pcireg.h>
63 #include <bus/pci/pcibus.h>
64 #include <bus/pci/pci_cfgreg.h>
65 #include <bus/pci/pcib_private.h>
69 static MALLOC_DEFINE(M_NEXUSDEV, "nexusdev", "Nexus device");
71 struct resource_list nx_resources;
75 #define DEVTONX(dev) ((struct nexus_device *)device_get_ivars(dev))
77 static struct rman irq_rman, drq_rman, port_rman, mem_rman;
79 static int nexus_probe(device_t);
80 static int nexus_attach(device_t);
81 static int nexus_print_all_resources(device_t dev);
82 static int nexus_print_child(device_t, device_t);
83 static device_t nexus_add_child(device_t bus, device_t parent, int order,
84 const char *name, int unit);
85 static struct resource *nexus_alloc_resource(device_t, device_t, int, int *,
86 u_long, u_long, u_long, u_int);
87 static int nexus_read_ivar(device_t, device_t, int, uintptr_t *);
88 static int nexus_write_ivar(device_t, device_t, int, uintptr_t);
89 static int nexus_activate_resource(device_t, device_t, int, int,
91 static int nexus_deactivate_resource(device_t, device_t, int, int,
93 static int nexus_release_resource(device_t, device_t, int, int,
95 static int nexus_config_intr(device_t, device_t, int, enum intr_trigger,
97 static int nexus_setup_intr(device_t, device_t, struct resource *, int flags,
98 void (*)(void *), void *,
99 void **, lwkt_serialize_t);
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);
107 * The device_identify method will cause nexus to automatically associate
108 * and attach to the root bus.
110 static device_method_t nexus_methods[] = {
111 /* Device interface */
112 DEVMETHOD(device_identify, bus_generic_identify),
113 DEVMETHOD(device_probe, nexus_probe),
114 DEVMETHOD(device_attach, nexus_attach),
115 DEVMETHOD(device_detach, bus_generic_detach),
116 DEVMETHOD(device_shutdown, bus_generic_shutdown),
117 DEVMETHOD(device_suspend, bus_generic_suspend),
118 DEVMETHOD(device_resume, bus_generic_resume),
121 DEVMETHOD(bus_print_child, nexus_print_child),
122 DEVMETHOD(bus_add_child, nexus_add_child),
123 DEVMETHOD(bus_read_ivar, nexus_read_ivar),
124 DEVMETHOD(bus_write_ivar, nexus_write_ivar),
125 DEVMETHOD(bus_alloc_resource, nexus_alloc_resource),
126 DEVMETHOD(bus_release_resource, nexus_release_resource),
127 DEVMETHOD(bus_activate_resource, nexus_activate_resource),
128 DEVMETHOD(bus_deactivate_resource, nexus_deactivate_resource),
129 DEVMETHOD(bus_config_intr, nexus_config_intr),
130 DEVMETHOD(bus_setup_intr, nexus_setup_intr),
131 DEVMETHOD(bus_teardown_intr, nexus_teardown_intr),
132 DEVMETHOD(bus_set_resource, nexus_set_resource),
133 DEVMETHOD(bus_get_resource, nexus_get_resource),
134 DEVMETHOD(bus_delete_resource, nexus_delete_resource),
139 static driver_t nexus_driver = {
144 static devclass_t nexus_devclass;
146 DRIVER_MODULE(nexus, root, nexus_driver, nexus_devclass, 0, 0);
149 nexus_probe(device_t dev)
151 device_quiet(dev); /* suppress attach message for neatness */
154 * IRQ's are on the mainboard on old systems, but on the ISA part
155 * of PCI->ISA bridges. There would be multiple sets of IRQs on
156 * multi-ISA-bus systems. PCI interrupts are routed to the ISA
157 * component, so in a way, PCI can be a partial child of an ISA bus(!).
158 * APIC interrupts are global though.
159 * In the non-APIC case, disallow the use of IRQ 2.
161 irq_rman.rm_start = 0;
162 irq_rman.rm_type = RMAN_ARRAY;
163 irq_rman.rm_descr = "Interrupt request lines";
165 #if SMP /* APIC-IO */
166 if (apic_io_enable) {
167 irq_rman.rm_end = APIC_INTMAPSIZE - 1;
168 if (rman_init(&irq_rman)
169 || rman_manage_region(&irq_rman,
170 irq_rman.rm_start, irq_rman.rm_end))
171 panic("nexus_probe irq_rman");
174 irq_rman.rm_end = 15;
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");
179 #if SMP /* APIC-IO */
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;
189 drq_rman.rm_type = RMAN_ARRAY;
190 drq_rman.rm_descr = "DMA request lines";
191 /* XXX drq 0 not available on some machines */
192 if (rman_init(&drq_rman)
193 || rman_manage_region(&drq_rman,
194 drq_rman.rm_start, drq_rman.rm_end))
195 panic("nexus_probe drq_rman");
198 * However, IO ports and Memory truely are global at this level,
199 * as are APIC interrupts (however many IO APICS there turn out
200 * to be on large systems..)
202 port_rman.rm_start = 0;
203 port_rman.rm_end = 0xffff;
204 port_rman.rm_type = RMAN_ARRAY;
205 port_rman.rm_descr = "I/O ports";
206 if (rman_init(&port_rman)
207 || rman_manage_region(&port_rman, 0, 0xffff))
208 panic("nexus_probe port_rman");
210 mem_rman.rm_start = 0;
211 mem_rman.rm_end = ~0u;
212 mem_rman.rm_type = RMAN_ARRAY;
213 mem_rman.rm_descr = "I/O memory addresses";
214 if (rman_init(&mem_rman)
215 || rman_manage_region(&mem_rman, 0, ~0))
216 panic("nexus_probe mem_rman");
218 return bus_generic_probe(dev);
222 nexus_attach(device_t dev)
227 * First, let our child driver's identify any child devices that
228 * they can find. Once that is done attach any devices that we
232 bus_generic_probe(dev);
234 bus_generic_attach(dev);
237 * And if we didn't see EISA or ISA on a pci bridge, create some
238 * connection points now so they show up "on motherboard".
240 if (!devclass_get_device(devclass_find("eisa"), 0)) {
241 child = BUS_ADD_CHILD(dev, dev, 0, "eisa", 0);
243 panic("nexus_attach eisa");
244 device_probe_and_attach(child);
246 if (!devclass_get_device(devclass_find("isa"), 0)) {
247 child = BUS_ADD_CHILD(dev, dev, 0, "isa", 0);
249 panic("nexus_attach isa");
250 device_probe_and_attach(child);
257 nexus_print_all_resources(device_t dev)
259 struct nexus_device *ndev = DEVTONX(dev);
260 struct resource_list *rl = &ndev->nx_resources;
263 if (SLIST_FIRST(rl) || ndev->nx_pcibus != -1)
264 retval += kprintf(" at");
266 retval += resource_list_print_type(rl, "port", SYS_RES_IOPORT, "%#lx");
267 retval += resource_list_print_type(rl, "iomem", SYS_RES_MEMORY, "%#lx");
268 retval += resource_list_print_type(rl, "irq", SYS_RES_IRQ, "%ld");
274 nexus_print_child(device_t bus, device_t child)
276 struct nexus_device *ndev = DEVTONX(child);
279 retval += bus_print_child_header(bus, child);
280 retval += nexus_print_all_resources(child);
281 if (ndev->nx_pcibus != -1)
282 retval += kprintf(" pcibus %d", ndev->nx_pcibus);
283 retval += kprintf(" on motherboard\n");
289 nexus_add_child(device_t bus, device_t parent, int order,
290 const char *name, int unit)
293 struct nexus_device *ndev;
295 ndev = kmalloc(sizeof(struct nexus_device), M_NEXUSDEV, M_INTWAIT|M_ZERO);
298 resource_list_init(&ndev->nx_resources);
299 ndev->nx_pcibus = -1;
301 child = device_add_child_ordered(parent, order, name, unit);
303 /* should we free this in nexus_child_detached? */
304 device_set_ivars(child, ndev);
310 nexus_read_ivar(device_t dev, device_t child, int which, uintptr_t *result)
312 struct nexus_device *ndev = DEVTONX(child);
315 case NEXUS_IVAR_PCIBUS:
316 *result = ndev->nx_pcibus;
325 nexus_write_ivar(device_t dev, device_t child, int which, uintptr_t value)
327 struct nexus_device *ndev = DEVTONX(child);
330 case NEXUS_IVAR_PCIBUS:
331 ndev->nx_pcibus = value;
340 * Allocate a resource on behalf of child. NB: child is usually going to be a
341 * child of one of our descendants, not a direct child of nexus0.
342 * (Exceptions include npx.)
344 static struct resource *
345 nexus_alloc_resource(device_t bus, device_t child, int type, int *rid,
346 u_long start, u_long end, u_long count, u_int flags)
348 struct nexus_device *ndev = DEVTONX(child);
350 struct resource_list_entry *rle;
352 int needactivate = flags & RF_ACTIVE;
355 * If this is an allocation of the "default" range for a given RID, and
356 * we know what the resources for this device are (ie. they aren't maintained
357 * by a child bus), then work out the start/end values.
359 if ((start == 0UL) && (end == ~0UL) && (count == 1)) {
362 rle = resource_list_find(&ndev->nx_resources, type, *rid);
393 rv = rman_reserve_resource(rm, start, end, count, flags, child);
397 if (type == SYS_RES_MEMORY) {
398 rman_set_bustag(rv, I386_BUS_SPACE_MEM);
399 } else if (type == SYS_RES_IOPORT) {
400 rman_set_bustag(rv, I386_BUS_SPACE_IO);
401 rman_set_bushandle(rv, rv->r_start);
405 if (bus_activate_resource(child, type, *rid, rv)) {
406 rman_release_resource(rv);
415 nexus_activate_resource(device_t bus, device_t child, int type, int rid,
419 * If this is a memory resource, map it into the kernel.
421 if (rman_get_bustag(r) == I386_BUS_SPACE_MEM) {
424 if (rman_get_end(r) < 1024 * 1024) {
426 * The first 1Mb is mapped at KERNBASE.
428 vaddr = (caddr_t)(uintptr_t)(KERNBASE + rman_get_start(r));
434 paddr = rman_get_start(r);
435 psize = rman_get_size(r);
437 poffs = paddr - trunc_page(paddr);
438 vaddr = (caddr_t) pmap_mapdev(paddr-poffs, psize+poffs) + poffs;
440 rman_set_virtual(r, vaddr);
441 /* IBM-PC: the type of bus_space_handle_t is u_int */
442 rman_set_bushandle(r, (bus_space_handle_t) vaddr);
444 return (rman_activate_resource(r));
448 nexus_deactivate_resource(device_t bus, device_t child, int type, int rid,
452 * If this is a memory resource, unmap it.
454 if ((rman_get_bustag(r) == I386_BUS_SPACE_MEM) &&
455 (rman_get_end(r) >= 1024 * 1024)) {
458 psize = rman_get_size(r);
459 pmap_unmapdev((vm_offset_t)rman_get_virtual(r), psize);
462 return (rman_deactivate_resource(r));
466 nexus_release_resource(device_t bus, device_t child, int type, int rid,
469 if (rman_get_flags(r) & RF_ACTIVE) {
470 int error = bus_deactivate_resource(child, type, rid, r);
474 return (rman_release_resource(r));
479 nexus_config_intr(device_t dev, device_t child, int irq, enum intr_trigger trig,
480 enum intr_polarity pol)
482 #ifdef SMP /* APIC-IO */
483 if (apic_io_enable) {
485 int slot = pci_get_slot(child);
486 int bus = pci_get_bus(child);
488 line = pci_apic_irq(bus, slot, pin);
491 line = isa_apic_irq(pci_get_irq(child));
495 return PCI_INVALID_IRQ;
502 * Currently this uses the really grody interface from kern/kern_intr.c
503 * (which really doesn't belong in kern/anything.c). Eventually, all of
504 * the code in kern_intr.c and machdep_intr.c should get moved here, since
505 * this is going to be the official interface.
508 nexus_setup_intr(device_t bus, device_t child, struct resource *irq,
509 int flags, void (*ihand)(void *), void *arg,
510 void **cookiep, lwkt_serialize_t serializer)
514 /* somebody tried to setup an irq that failed to allocate! */
516 panic("nexus_setup_intr: NULL irq resource!");
520 if ((irq->r_flags & RF_SHAREABLE) == 0)
521 icflags |= INTR_EXCL;
524 * We depend here on rman_activate_resource() being idempotent.
526 error = rman_activate_resource(irq);
531 * XXX cast the interrupt handler function to an inthand2_t. The
532 * difference is that an additional frame argument is passed which
533 * we do not currently want to expose the BUS subsystem to.
535 *cookiep = register_int(irq->r_start, (inthand2_t *)ihand, arg,
536 device_get_nameunit(child), serializer,
538 if (*cookiep == NULL)
544 nexus_teardown_intr(device_t dev, device_t child, struct resource *r, void *ih)
554 nexus_set_resource(device_t dev, device_t child, int type, int rid, u_long start, u_long count)
556 struct nexus_device *ndev = DEVTONX(child);
557 struct resource_list *rl = &ndev->nx_resources;
559 /* XXX this should return a success/failure indicator */
560 resource_list_add(rl, type, rid, start, start + count - 1, count);
565 nexus_get_resource(device_t dev, device_t child, int type, int rid, u_long *startp, u_long *countp)
567 struct nexus_device *ndev = DEVTONX(child);
568 struct resource_list *rl = &ndev->nx_resources;
569 struct resource_list_entry *rle;
571 rle = resource_list_find(rl, type, rid);
572 device_printf(child, "type %d rid %d startp %p countp %p - got %p\n",
573 type, rid, startp, countp, rle);
577 *startp = rle->start;
579 *countp = rle->count;
584 nexus_delete_resource(device_t dev, device_t child, int type, int rid)
586 struct nexus_device *ndev = DEVTONX(child);
587 struct resource_list *rl = &ndev->nx_resources;
589 resource_list_delete(rl, type, rid);