2 * Copyright 1998 Massachusetts Institute of Technology
3 * Copyright (c) 2008 The DragonFly Project.
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30 * $FreeBSD: src/sys/i386/i386/nexus.c,v 1.26.2.10 2003/02/22 13:16:45 imp 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>
51 #include <sys/interrupt.h>
53 #include <machine/vmparam.h>
56 #include <machine/pmap.h>
58 #include <machine/nexusvar.h>
59 #include <machine/smp.h>
60 #include <machine_base/apic/mpapic.h>
61 #include <machine_base/isa/intr_machdep.h>
63 #define I386_BUS_SPACE_IO 0 /* space is i/o space */
64 #define I386_BUS_SPACE_MEM 1 /* space is mem space */
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, 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);
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_setup_intr(device_t, device_t, struct resource *, int flags,
93 void (*)(void *), void *,
94 void **, lwkt_serialize_t);
95 static int nexus_teardown_intr(device_t, device_t, struct resource *,
97 static int nexus_set_resource(device_t, device_t, int, int, u_long, u_long);
98 static int nexus_get_resource(device_t, device_t, int, int, u_long *, u_long *);
99 static void nexus_delete_resource(device_t, device_t, int, int);
102 * The device_identify method will cause nexus to automatically associate
103 * and attach to the root bus.
105 static device_method_t nexus_methods[] = {
106 /* Device interface */
107 DEVMETHOD(device_identify, bus_generic_identify),
108 DEVMETHOD(device_probe, nexus_probe),
109 DEVMETHOD(device_attach, nexus_attach),
110 DEVMETHOD(device_detach, bus_generic_detach),
111 DEVMETHOD(device_shutdown, bus_generic_shutdown),
112 DEVMETHOD(device_suspend, bus_generic_suspend),
113 DEVMETHOD(device_resume, bus_generic_resume),
116 DEVMETHOD(bus_print_child, nexus_print_child),
117 DEVMETHOD(bus_add_child, nexus_add_child),
118 DEVMETHOD(bus_read_ivar, nexus_read_ivar),
119 DEVMETHOD(bus_write_ivar, nexus_write_ivar),
120 DEVMETHOD(bus_alloc_resource, nexus_alloc_resource),
121 DEVMETHOD(bus_release_resource, nexus_release_resource),
122 DEVMETHOD(bus_activate_resource, nexus_activate_resource),
123 DEVMETHOD(bus_deactivate_resource, nexus_deactivate_resource),
124 DEVMETHOD(bus_setup_intr, nexus_setup_intr),
125 DEVMETHOD(bus_teardown_intr, nexus_teardown_intr),
126 DEVMETHOD(bus_set_resource, nexus_set_resource),
127 DEVMETHOD(bus_get_resource, nexus_get_resource),
128 DEVMETHOD(bus_delete_resource, nexus_delete_resource),
133 static driver_t nexus_driver = {
138 static devclass_t nexus_devclass;
140 DRIVER_MODULE(nexus, root, nexus_driver, nexus_devclass, 0, 0);
143 nexus_probe(device_t dev)
145 device_quiet(dev); /* suppress attach message for neatness */
148 * IRQ's are on the mainboard on old systems, but on the ISA part
149 * of PCI->ISA bridges. There would be multiple sets of IRQs on
150 * multi-ISA-bus systems. PCI interrupts are routed to the ISA
151 * component, so in a way, PCI can be a partial child of an ISA bus(!).
152 * APIC interrupts are global though.
153 * In the non-APIC case, disallow the use of IRQ 2.
155 irq_rman.rm_start = 0;
156 irq_rman.rm_type = RMAN_ARRAY;
157 irq_rman.rm_descr = "Interrupt request lines";
158 #ifdef SMP /* APIC-IO */
159 if (apic_io_enable) {
160 irq_rman.rm_end = APIC_INTMAPSIZE - 1;
161 if (rman_init(&irq_rman)
162 || rman_manage_region(&irq_rman,
163 irq_rman.rm_start, irq_rman.rm_end))
164 panic("nexus_probe irq_rman");
167 irq_rman.rm_end = 15;
168 if (rman_init(&irq_rman)
169 || rman_manage_region(&irq_rman, irq_rman.rm_start, 1)
170 || rman_manage_region(&irq_rman, 3, irq_rman.rm_end))
171 panic("nexus_probe irq_rman");
172 #ifdef SMP /* APIC-IO */
177 * ISA DMA on PCI systems is implemented in the ISA part of each
178 * PCI->ISA bridge and the channels can be duplicated if there are
179 * multiple bridges. (eg: laptops with docking stations)
181 drq_rman.rm_start = 0;
183 drq_rman.rm_type = RMAN_ARRAY;
184 drq_rman.rm_descr = "DMA request lines";
185 /* XXX drq 0 not available on some machines */
186 if (rman_init(&drq_rman)
187 || rman_manage_region(&drq_rman,
188 drq_rman.rm_start, drq_rman.rm_end))
189 panic("nexus_probe drq_rman");
192 * However, IO ports and Memory truely are global at this level,
193 * as are APIC interrupts (however many IO APICS there turn out
194 * to be on large systems..)
196 port_rman.rm_start = 0;
197 port_rman.rm_end = 0xffff;
198 port_rman.rm_type = RMAN_ARRAY;
199 port_rman.rm_descr = "I/O ports";
200 if (rman_init(&port_rman)
201 || rman_manage_region(&port_rman, 0, 0xffff))
202 panic("nexus_probe port_rman");
204 mem_rman.rm_start = 0;
205 mem_rman.rm_end = ~0u;
206 mem_rman.rm_type = RMAN_ARRAY;
207 mem_rman.rm_descr = "I/O memory addresses";
208 if (rman_init(&mem_rman)
209 || rman_manage_region(&mem_rman, 0, ~0))
210 panic("nexus_probe mem_rman");
212 return bus_generic_probe(dev);
216 nexus_attach(device_t dev)
221 * First, let our child driver's identify any child devices that
222 * they can find. Once that is done attach any devices that we
226 bus_generic_probe(dev);
228 bus_generic_attach(dev);
231 * And if we didn't see EISA or ISA on a pci bridge, create some
232 * connection points now so they show up "on motherboard".
234 if (!devclass_get_device(devclass_find("eisa"), 0)) {
235 child = BUS_ADD_CHILD(dev, dev, 0, "eisa", 0);
237 panic("nexus_attach eisa");
238 device_probe_and_attach(child);
240 if (!devclass_get_device(devclass_find("isa"), 0)) {
241 child = BUS_ADD_CHILD(dev, dev, 0, "isa", 0);
243 panic("nexus_attach isa");
244 device_probe_and_attach(child);
251 nexus_print_all_resources(device_t dev)
253 struct nexus_device *ndev = DEVTONX(dev);
254 struct resource_list *rl = &ndev->nx_resources;
257 if (SLIST_FIRST(rl) || ndev->nx_pcibus != -1)
258 retval += kprintf(" at");
260 retval += resource_list_print_type(rl, "port", SYS_RES_IOPORT, "%#lx");
261 retval += resource_list_print_type(rl, "iomem", SYS_RES_MEMORY, "%#lx");
262 retval += resource_list_print_type(rl, "irq", SYS_RES_IRQ, "%ld");
268 nexus_print_child(device_t bus, device_t child)
270 struct nexus_device *ndev = DEVTONX(child);
273 retval += bus_print_child_header(bus, child);
274 retval += nexus_print_all_resources(child);
275 if (ndev->nx_pcibus != -1)
276 retval += kprintf(" pcibus %d", ndev->nx_pcibus);
277 retval += kprintf(" on motherboard\n");
283 nexus_add_child(device_t bus, device_t parent, int order,
284 const char *name, int unit)
287 struct nexus_device *ndev;
289 ndev = kmalloc(sizeof(struct nexus_device), M_NEXUSDEV, M_INTWAIT|M_ZERO);
292 resource_list_init(&ndev->nx_resources);
293 ndev->nx_pcibus = -1;
295 child = device_add_child_ordered(parent, order, name, unit);
297 /* should we free this in nexus_child_detached? */
298 device_set_ivars(child, ndev);
304 nexus_read_ivar(device_t dev, device_t child, int which, uintptr_t *result)
306 struct nexus_device *ndev = DEVTONX(child);
309 case NEXUS_IVAR_PCIBUS:
310 *result = ndev->nx_pcibus;
319 nexus_write_ivar(device_t dev, device_t child, int which, uintptr_t value)
321 struct nexus_device *ndev = DEVTONX(child);
324 case NEXUS_IVAR_PCIBUS:
325 ndev->nx_pcibus = value;
334 * Allocate a resource on behalf of child. NB: child is usually going to be a
335 * child of one of our descendants, not a direct child of nexus0.
336 * (Exceptions include npx.)
338 static struct resource *
339 nexus_alloc_resource(device_t bus, device_t child, int type, int *rid,
340 u_long start, u_long end, u_long count, u_int flags)
342 struct nexus_device *ndev = DEVTONX(child);
344 struct resource_list_entry *rle;
346 int needactivate = flags & RF_ACTIVE;
349 * If this is an allocation of the "default" range for a given RID, and
350 * we know what the resources for this device are (ie. they aren't maintained
351 * by a child bus), then work out the start/end values.
353 if ((start == 0UL) && (end == ~0UL) && (count == 1)) {
356 rle = resource_list_find(&ndev->nx_resources, type, *rid);
387 rv = rman_reserve_resource(rm, start, end, count, flags, child);
391 if (type == SYS_RES_MEMORY) {
392 rman_set_bustag(rv, I386_BUS_SPACE_MEM);
393 } else if (type == SYS_RES_IOPORT) {
394 rman_set_bustag(rv, I386_BUS_SPACE_IO);
395 rman_set_bushandle(rv, rv->r_start);
399 if (bus_activate_resource(child, type, *rid, rv)) {
400 rman_release_resource(rv);
409 nexus_activate_resource(device_t bus, device_t child, int type, int rid,
413 * If this is a memory resource, map it into the kernel.
415 if (rman_get_bustag(r) == I386_BUS_SPACE_MEM) {
418 if (rman_get_end(r) < 1024 * 1024) {
420 * The first 1Mb is mapped at KERNBASE.
422 vaddr = (caddr_t)(uintptr_t)(KERNBASE + rman_get_start(r));
428 paddr = rman_get_start(r);
429 psize = rman_get_size(r);
431 poffs = paddr - trunc_page(paddr);
432 vaddr = (caddr_t) pmap_mapdev(paddr-poffs, psize+poffs) + poffs;
434 rman_set_virtual(r, vaddr);
435 /* IBM-PC: the type of bus_space_handle_t is u_int */
436 rman_set_bushandle(r, (bus_space_handle_t) vaddr);
438 return (rman_activate_resource(r));
442 nexus_deactivate_resource(device_t bus, device_t child, int type, int rid,
446 * If this is a memory resource, unmap it.
448 if ((rman_get_bustag(r) == I386_BUS_SPACE_MEM) &&
449 (rman_get_end(r) >= 1024 * 1024)) {
452 psize = rman_get_size(r);
453 pmap_unmapdev((vm_offset_t)rman_get_virtual(r), psize);
456 return (rman_deactivate_resource(r));
460 nexus_release_resource(device_t bus, device_t child, int type, int rid,
463 if (rman_get_flags(r) & RF_ACTIVE) {
464 int error = bus_deactivate_resource(child, type, rid, r);
468 return (rman_release_resource(r));
472 * Currently this uses the really grody interface from kern/kern_intr.c
473 * (which really doesn't belong in kern/anything.c). Eventually, all of
474 * the code in kern_intr.c and machdep_intr.c should get moved here, since
475 * this is going to be the official interface.
478 nexus_setup_intr(device_t bus, device_t child, struct resource *irq,
479 int flags, void (*ihand)(void *), void *arg,
480 void **cookiep, lwkt_serialize_t serializer)
484 /* somebody tried to setup an irq that failed to allocate! */
486 panic("nexus_setup_intr: NULL irq resource!");
490 if ((irq->r_flags & RF_SHAREABLE) == 0)
491 icflags |= INTR_EXCL;
494 * We depend here on rman_activate_resource() being idempotent.
496 error = rman_activate_resource(irq);
501 * XXX cast the interrupt handler function to an inthand2_t. The
502 * difference is that an additional frame argument is passed which
503 * we do not currently want to expose the BUS subsystem to.
505 *cookiep = register_int(irq->r_start, (inthand2_t *)ihand, arg,
506 device_get_nameunit(child), serializer,
508 if (*cookiep == NULL)
514 nexus_teardown_intr(device_t dev, device_t child, struct resource *r, void *ih)
524 nexus_set_resource(device_t dev, device_t child, int type, int rid, u_long start, u_long count)
526 struct nexus_device *ndev = DEVTONX(child);
527 struct resource_list *rl = &ndev->nx_resources;
529 /* XXX this should return a success/failure indicator */
530 resource_list_add(rl, type, rid, start, start + count - 1, count);
535 nexus_get_resource(device_t dev, device_t child, int type, int rid, u_long *startp, u_long *countp)
537 struct nexus_device *ndev = DEVTONX(child);
538 struct resource_list *rl = &ndev->nx_resources;
539 struct resource_list_entry *rle;
541 rle = resource_list_find(rl, type, rid);
542 device_printf(child, "type %d rid %d startp %p countp %p - got %p\n",
543 type, rid, startp, countp, rle);
547 *startp = rle->start;
549 *countp = rle->count;
554 nexus_delete_resource(device_t dev, device_t child, int type, int rid)
556 struct nexus_device *ndev = DEVTONX(child);
557 struct resource_list *rl = &ndev->nx_resources;
559 resource_list_delete(rl, type, rid);