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.
45 #include <sys/param.h>
46 #include <sys/systm.h>
48 #include <sys/kernel.h>
49 #include <sys/malloc.h>
50 #include <sys/module.h>
51 #include <machine/bus.h>
54 #include <machine/vmparam.h>
57 #include <machine/pmap.h>
59 #include <machine/resource.h>
61 #include <machine/smp.h>
62 #include <machine/mpapic.h>
66 #include <pc98/pc98/pc98.h>
68 #include <i386/isa/isa.h>
70 #include <i386/isa/intr_machdep.h>
72 static MALLOC_DEFINE(M_NEXUSDEV, "nexusdev", "Nexus device");
74 struct resource_list nx_resources;
77 #define DEVTONX(dev) ((struct nexus_device *)device_get_ivars(dev))
79 static struct rman irq_rman, drq_rman, port_rman, mem_rman;
81 static int nexus_probe(device_t);
82 static int nexus_attach(device_t);
83 static int nexus_print_all_resources(device_t dev);
84 static int nexus_print_child(device_t, device_t);
85 static device_t nexus_add_child(device_t bus, int order, const char *name,
87 static struct resource *nexus_alloc_resource(device_t, device_t, int, int *,
88 u_long, u_long, u_long, u_int);
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_setup_intr(device_t, device_t, struct resource *, int flags,
96 void (*)(void *), void *, void **);
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);
100 static int nexus_get_resource(device_t, device_t, int, int, u_long *, u_long *);
101 static void nexus_delete_resource(device_t, device_t, int, int);
103 static device_method_t nexus_methods[] = {
104 /* Device interface */
105 DEVMETHOD(device_probe, nexus_probe),
106 DEVMETHOD(device_attach, nexus_attach),
107 DEVMETHOD(device_detach, bus_generic_detach),
108 DEVMETHOD(device_shutdown, bus_generic_shutdown),
109 DEVMETHOD(device_suspend, bus_generic_suspend),
110 DEVMETHOD(device_resume, bus_generic_resume),
113 DEVMETHOD(bus_print_child, nexus_print_child),
114 DEVMETHOD(bus_add_child, nexus_add_child),
115 DEVMETHOD(bus_read_ivar, bus_generic_read_ivar),
116 DEVMETHOD(bus_write_ivar, bus_generic_write_ivar),
117 DEVMETHOD(bus_alloc_resource, nexus_alloc_resource),
118 DEVMETHOD(bus_release_resource, nexus_release_resource),
119 DEVMETHOD(bus_activate_resource, nexus_activate_resource),
120 DEVMETHOD(bus_deactivate_resource, nexus_deactivate_resource),
121 DEVMETHOD(bus_setup_intr, nexus_setup_intr),
122 DEVMETHOD(bus_teardown_intr, nexus_teardown_intr),
123 DEVMETHOD(bus_set_resource, nexus_set_resource),
124 DEVMETHOD(bus_get_resource, nexus_get_resource),
125 DEVMETHOD(bus_delete_resource, nexus_delete_resource),
130 static driver_t nexus_driver = {
135 static devclass_t nexus_devclass;
137 DRIVER_MODULE(nexus, root, nexus_driver, nexus_devclass, 0, 0);
140 nexus_probe(device_t dev)
143 device_quiet(dev); /* suppress attach message for neatness */
146 * IRQ's are on the mainboard on old systems, but on the ISA part
147 * of PCI->ISA bridges. There would be multiple sets of IRQs on
148 * multi-ISA-bus systems. PCI interrupts are routed to the ISA
149 * component, so in a way, PCI can be a partial child of an ISA bus(!).
150 * APIC interrupts are global though.
151 * In the non-APIC case, disallow the use of IRQ 2.
153 irq_rman.rm_start = 0;
154 irq_rman.rm_type = RMAN_ARRAY;
155 irq_rman.rm_descr = "Interrupt request lines";
157 irq_rman.rm_end = APIC_INTMAPSIZE - 1;
158 if (rman_init(&irq_rman)
159 || rman_manage_region(&irq_rman,
160 irq_rman.rm_start, irq_rman.rm_end))
161 panic("nexus_probe irq_rman");
163 irq_rman.rm_end = 15;
165 if (rman_init(&irq_rman)
166 || rman_manage_region(&irq_rman,
167 irq_rman.rm_start, irq_rman.rm_end))
168 panic("nexus_probe irq_rman");
170 if (rman_init(&irq_rman)
171 || rman_manage_region(&irq_rman, irq_rman.rm_start, 1)
172 || rman_manage_region(&irq_rman, 3, irq_rman.rm_end))
173 panic("nexus_probe irq_rman");
178 * ISA DMA on PCI systems is implemented in the ISA part of each
179 * PCI->ISA bridge and the channels can be duplicated if there are
180 * multiple bridges. (eg: laptops with docking stations)
182 drq_rman.rm_start = 0;
188 drq_rman.rm_type = RMAN_ARRAY;
189 drq_rman.rm_descr = "DMA request lines";
190 /* XXX drq 0 not available on some machines */
191 if (rman_init(&drq_rman)
192 || rman_manage_region(&drq_rman,
193 drq_rman.rm_start, drq_rman.rm_end))
194 panic("nexus_probe drq_rman");
197 * However, IO ports and Memory truely are global at this level,
198 * as are APIC interrupts (however many IO APICS there turn out
199 * to be on large systems..)
201 port_rman.rm_start = 0;
202 port_rman.rm_end = 0xffff;
203 port_rman.rm_type = RMAN_ARRAY;
204 port_rman.rm_descr = "I/O ports";
205 if (rman_init(&port_rman)
206 || rman_manage_region(&port_rman, 0, 0xffff))
207 panic("nexus_probe port_rman");
209 mem_rman.rm_start = 0;
210 mem_rman.rm_end = ~0u;
211 mem_rman.rm_type = RMAN_ARRAY;
212 mem_rman.rm_descr = "I/O memory addresses";
213 if (rman_init(&mem_rman)
214 || rman_manage_region(&mem_rman, 0, ~0))
215 panic("nexus_probe mem_rman");
217 return bus_generic_probe(dev);
221 nexus_attach(device_t dev)
226 * First, deal with the children we know about already
228 bus_generic_attach(dev);
230 * And if we didn't see EISA or ISA on a pci bridge, create some
231 * connection points now so they show up "on motherboard".
233 if (!devclass_get_device(devclass_find("eisa"), 0)) {
234 child = BUS_ADD_CHILD(dev, 0, "eisa", 0);
236 panic("nexus_attach eisa");
237 device_probe_and_attach(child);
240 if (!devclass_get_device(devclass_find("mca"), 0)) {
241 child = BUS_ADD_CHILD(dev, 0, "mca", 0);
243 panic("nexus_probe mca");
244 device_probe_and_attach(child);
247 if (!devclass_get_device(devclass_find("isa"), 0)) {
248 child = BUS_ADD_CHILD(dev, 0, "isa", 0);
250 panic("nexus_attach isa");
251 device_probe_and_attach(child);
258 nexus_print_all_resources(device_t dev)
260 struct nexus_device *ndev = DEVTONX(dev);
261 struct resource_list *rl = &ndev->nx_resources;
265 retval += printf(" at");
267 retval += resource_list_print_type(rl, "port", SYS_RES_IOPORT, "%#lx");
268 retval += resource_list_print_type(rl, "iomem", SYS_RES_MEMORY, "%#lx");
269 retval += resource_list_print_type(rl, "irq", SYS_RES_IRQ, "%ld");
275 nexus_print_child(device_t bus, device_t child)
279 retval += bus_print_child_header(bus, child);
280 retval += nexus_print_all_resources(child);
281 retval += printf(" on motherboard\n");
287 nexus_add_child(device_t bus, int order, const char *name, int unit)
290 struct nexus_device *ndev;
292 ndev = malloc(sizeof(struct nexus_device), M_NEXUSDEV, M_NOWAIT|M_ZERO);
295 resource_list_init(&ndev->nx_resources);
297 child = device_add_child_ordered(bus, order, name, unit);
299 /* should we free this in nexus_child_detached? */
300 device_set_ivars(child, ndev);
306 * Allocate a resource on behalf of child. NB: child is usually going to be a
307 * child of one of our descendants, not a direct child of nexus0.
308 * (Exceptions include npx.)
310 static struct resource *
311 nexus_alloc_resource(device_t bus, device_t child, int type, int *rid,
312 u_long start, u_long end, u_long count, u_int flags)
314 struct nexus_device *ndev = DEVTONX(child);
316 struct resource_list_entry *rle;
318 int needactivate = flags & RF_ACTIVE;
321 * If this is an allocation of the "default" range for a given RID, and
322 * we know what the resources for this device are (ie. they aren't maintained
323 * by a child bus), then work out the start/end values.
325 if ((start == 0UL) && (end == ~0UL) && (count == 1)) {
328 rle = resource_list_find(&ndev->nx_resources, type, *rid);
359 rv = rman_reserve_resource(rm, start, end, count, flags, child);
363 if (type == SYS_RES_MEMORY) {
364 rman_set_bustag(rv, I386_BUS_SPACE_MEM);
365 } else if (type == SYS_RES_IOPORT) {
366 rman_set_bustag(rv, I386_BUS_SPACE_IO);
368 rman_set_bushandle(rv, rv->r_start);
373 if ((type == SYS_RES_MEMORY || type == SYS_RES_IOPORT) &&
374 i386_bus_space_handle_alloc(rv->r_bustag, rv->r_start, count,
375 &rv->r_bushandle) != 0) {
376 rman_release_resource(rv);
382 if (bus_activate_resource(child, type, *rid, rv)) {
384 if (type == SYS_RES_MEMORY || type == SYS_RES_IOPORT) {
385 i386_bus_space_handle_free(rv->r_bustag,
386 rv->r_bushandle, rv->r_bushandle->bsh_sz);
389 rman_release_resource(rv);
398 nexus_activate_resource(device_t bus, device_t child, int type, int rid,
402 * If this is a memory resource, map it into the kernel.
404 if (rman_get_bustag(r) == I386_BUS_SPACE_MEM) {
407 if (r->r_end < 1024 * 1024) {
409 * The first 1Mb is mapped at KERNBASE.
411 vaddr = (caddr_t)(uintptr_t)(KERNBASE + r->r_start);
418 psize = r->r_end - r->r_start;
420 poffs = paddr - trunc_page(paddr);
421 vaddr = (caddr_t) pmap_mapdev(paddr-poffs, psize+poffs) + poffs;
423 rman_set_virtual(r, vaddr);
425 /* PC-98: the type of bus_space_handle_t is the structure. */
426 r->r_bushandle->bsh_base = (bus_addr_t) vaddr;
428 /* IBM-PC: the type of bus_space_handle_t is u_int */
429 rman_set_bushandle(r, (bus_space_handle_t) vaddr);
432 return (rman_activate_resource(r));
436 nexus_deactivate_resource(device_t bus, device_t child, int type, int rid,
440 * If this is a memory resource, unmap it.
442 if ((rman_get_bustag(r) == I386_BUS_SPACE_MEM) && (r->r_end >= 1024 * 1024)) {
445 psize = r->r_end - r->r_start;
446 pmap_unmapdev((vm_offset_t)rman_get_virtual(r), psize);
449 return (rman_deactivate_resource(r));
453 nexus_release_resource(device_t bus, device_t child, int type, int rid,
456 if (r->r_flags & RF_ACTIVE) {
457 int error = bus_deactivate_resource(child, type, rid, r);
462 if (type == SYS_RES_MEMORY || type == SYS_RES_IOPORT) {
463 i386_bus_space_handle_free(r->r_bustag, r->r_bushandle,
464 r->r_bushandle->bsh_sz);
467 return (rman_release_resource(r));
471 * Currently this uses the really grody interface from kern/kern_intr.c
472 * (which really doesn't belong in kern/anything.c). Eventually, all of
473 * the code in kern_intr.c and machdep_intr.c should get moved here, since
474 * this is going to be the official interface.
477 nexus_setup_intr(device_t bus, device_t child, struct resource *irq,
478 int flags, void (*ihand)(void *), void *arg, void **cookiep)
484 /* somebody tried to setup an irq that failed to allocate! */
486 panic("nexus_setup_intr: NULL irq resource!");
489 if (irq->r_flags & RF_SHAREABLE)
494 driver = device_get_driver(child);
495 switch (flags & ~INTR_TYPE_FAST) {
512 panic("still using grody create_intr interface");
514 if (flags & INTR_TYPE_FAST)
515 icflags |= INTR_FAST;
518 * We depend here on rman_activate_resource() being idempotent.
520 error = rman_activate_resource(irq);
524 *cookiep = inthand_add(device_get_nameunit(child), irq->r_start,
525 ihand, arg, mask, icflags);
526 if (*cookiep == NULL)
527 error = EINVAL; /* XXX ??? */
533 nexus_teardown_intr(device_t dev, device_t child, struct resource *r, void *ih)
535 return (inthand_remove(ih));
539 nexus_set_resource(device_t dev, device_t child, int type, int rid, u_long start, u_long count)
541 struct nexus_device *ndev = DEVTONX(child);
542 struct resource_list *rl = &ndev->nx_resources;
544 /* XXX this should return a success/failure indicator */
545 resource_list_add(rl, type, rid, start, start + count - 1, count);
550 nexus_get_resource(device_t dev, device_t child, int type, int rid, u_long *startp, u_long *countp)
552 struct nexus_device *ndev = DEVTONX(child);
553 struct resource_list *rl = &ndev->nx_resources;
554 struct resource_list_entry *rle;
556 rle = resource_list_find(rl, type, rid);
557 device_printf(child, "type %d rid %d startp %p countp %p - got %p\n",
558 type, rid, startp, countp, rle);
562 *startp = rle->start;
564 *countp = rle->count;
569 nexus_delete_resource(device_t dev, device_t child, int type, int rid)
571 struct nexus_device *ndev = DEVTONX(child);
572 struct resource_list *rl = &ndev->nx_resources;
574 resource_list_delete(rl, type, rid);