1 /*
2 * Copyright 1998 Massachusetts Institute of Technology
3 *
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
14 * warranty.
15 *
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
27 * SUCH DAMAGE.
28 */
29
30 #include <sys/cdefs.h>
31 __FBSDID("$FreeBSD: releng/5.3/sys/amd64/amd64/nexus.c 134567 2004-08-31 05:26:37Z njl $");
32
33 /*
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.
42 */
43
44 #define __RMAN_RESOURCE_VISIBLE
45 #include "opt_isa.h"
46
47 #include <sys/param.h>
48 #include <sys/systm.h>
49 #include <sys/bus.h>
50 #include <sys/kernel.h>
51 #include <sys/malloc.h>
52 #include <sys/module.h>
53 #include <machine/bus.h>
54 #include <machine/intr_machdep.h>
55 #include <sys/rman.h>
56 #include <sys/interrupt.h>
57
58 #include <machine/vmparam.h>
59 #include <vm/vm.h>
60 #include <vm/pmap.h>
61 #include <machine/pmap.h>
62
63 #include <machine/resource.h>
64
65 #ifdef DEV_ISA
66 #include <isa/isavar.h>
67 #include <amd64/isa/isa.h>
68 #endif
69 #include <sys/rtprio.h>
70
71 static MALLOC_DEFINE(M_NEXUSDEV, "nexusdev", "Nexus device");
72 struct nexus_device {
73 struct resource_list nx_resources;
74 };
75
76 #define DEVTONX(dev) ((struct nexus_device *)device_get_ivars(dev))
77
78 static struct rman irq_rman, drq_rman, port_rman, mem_rman;
79
80 static int nexus_probe(device_t);
81 static int nexus_attach(device_t);
82 static int nexus_print_all_resources(device_t dev);
83 static int nexus_print_child(device_t, device_t);
84 static device_t nexus_add_child(device_t bus, int order, const char *name,
85 int unit);
86 static struct resource *nexus_alloc_resource(device_t, device_t, int, int *,
87 u_long, u_long, u_long, u_int);
88 static int nexus_config_intr(device_t, int, enum intr_trigger,
89 enum intr_polarity);
90 static int nexus_activate_resource(device_t, device_t, int, int,
91 struct resource *);
92 static int nexus_deactivate_resource(device_t, device_t, int, int,
93 struct resource *);
94 static int nexus_release_resource(device_t, device_t, int, int,
95 struct resource *);
96 static int nexus_setup_intr(device_t, device_t, struct resource *, int flags,
97 void (*)(void *), void *, void **);
98 static int nexus_teardown_intr(device_t, device_t, struct resource *,
99 void *);
100 static struct resource_list *nexus_get_reslist(device_t dev, device_t child);
101 static int nexus_set_resource(device_t, device_t, int, int, u_long, u_long);
102 static int nexus_get_resource(device_t, device_t, int, int, u_long *, u_long *);
103 static void nexus_delete_resource(device_t, device_t, int, int);
104
105 static device_method_t nexus_methods[] = {
106 /* Device interface */
107 DEVMETHOD(device_probe, nexus_probe),
108 DEVMETHOD(device_attach, nexus_attach),
109 DEVMETHOD(device_detach, bus_generic_detach),
110 DEVMETHOD(device_shutdown, bus_generic_shutdown),
111 DEVMETHOD(device_suspend, bus_generic_suspend),
112 DEVMETHOD(device_resume, bus_generic_resume),
113
114 /* Bus interface */
115 DEVMETHOD(bus_print_child, nexus_print_child),
116 DEVMETHOD(bus_add_child, nexus_add_child),
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_config_intr, nexus_config_intr),
124 DEVMETHOD(bus_get_resource_list, nexus_get_reslist),
125 DEVMETHOD(bus_set_resource, nexus_set_resource),
126 DEVMETHOD(bus_get_resource, nexus_get_resource),
127 DEVMETHOD(bus_delete_resource, nexus_delete_resource),
128
129 { 0, 0 }
130 };
131
132 static driver_t nexus_driver = {
133 "nexus",
134 nexus_methods,
135 1, /* no softc */
136 };
137 static devclass_t nexus_devclass;
138
139 DRIVER_MODULE(nexus, root, nexus_driver, nexus_devclass, 0, 0);
140
141 static int
142 nexus_probe(device_t dev)
143 {
144 int irq, last;
145
146 device_quiet(dev); /* suppress attach message for neatness */
147
148 /*
149 * XXX working notes:
150 *
151 * - IRQ resource creation should be moved to the PIC/APIC driver.
152 * - DRQ resource creation should be moved to the DMAC driver.
153 * - The above should be sorted to probe earlier than any child busses.
154 *
155 * - Leave I/O and memory creation here, as child probes may need them.
156 * (especially eg. ACPI)
157 */
158
159 /*
160 * IRQ's are on the mainboard on old systems, but on the ISA part
161 * of PCI->ISA bridges. There would be multiple sets of IRQs on
162 * multi-ISA-bus systems. PCI interrupts are routed to the ISA
163 * component, so in a way, PCI can be a partial child of an ISA bus(!).
164 * APIC interrupts are global though.
165 */
166 irq_rman.rm_start = 0;
167 irq_rman.rm_type = RMAN_ARRAY;
168 irq_rman.rm_descr = "Interrupt request lines";
169 irq_rman.rm_end = NUM_IO_INTS - 1;
170 if (rman_init(&irq_rman))
171 panic("nexus_probe irq_rman");
172
173 /*
174 * We search for regions of existing IRQs and add those to the IRQ
175 * resource manager.
176 */
177 last = -1;
178 for (irq = 0; irq < NUM_IO_INTS; irq++)
179 if (intr_lookup_source(irq) != NULL) {
180 if (last == -1)
181 last = irq;
182 } else if (last != -1) {
183 if (rman_manage_region(&irq_rman, last, irq - 1) != 0)
184 panic("nexus_probe irq_rman add");
185 last = -1;
186 }
187 if (last != -1 && rman_manage_region(&irq_rman, last, irq - 1) != 0)
188 panic("nexus_probe irq_rman add");
189
190 /*
191 * ISA DMA on PCI systems is implemented in the ISA part of each
192 * PCI->ISA bridge and the channels can be duplicated if there are
193 * multiple bridges. (eg: laptops with docking stations)
194 */
195 drq_rman.rm_start = 0;
196 drq_rman.rm_end = 7;
197 drq_rman.rm_type = RMAN_ARRAY;
198 drq_rman.rm_descr = "DMA request lines";
199 /* XXX drq 0 not available on some machines */
200 if (rman_init(&drq_rman)
201 || rman_manage_region(&drq_rman,
202 drq_rman.rm_start, drq_rman.rm_end))
203 panic("nexus_probe drq_rman");
204
205 /*
206 * However, IO ports and Memory truely are global at this level,
207 * as are APIC interrupts (however many IO APICS there turn out
208 * to be on large systems..)
209 */
210 port_rman.rm_start = 0;
211 port_rman.rm_end = 0xffff;
212 port_rman.rm_type = RMAN_ARRAY;
213 port_rman.rm_descr = "I/O ports";
214 if (rman_init(&port_rman)
215 || rman_manage_region(&port_rman, 0, 0xffff))
216 panic("nexus_probe port_rman");
217
218 mem_rman.rm_start = 0;
219 mem_rman.rm_end = ~0u;
220 mem_rman.rm_type = RMAN_ARRAY;
221 mem_rman.rm_descr = "I/O memory addresses";
222 if (rman_init(&mem_rman)
223 || rman_manage_region(&mem_rman, 0, ~0))
224 panic("nexus_probe mem_rman");
225
226 return 0;
227 }
228
229 static int
230 nexus_attach(device_t dev)
231 {
232
233 bus_generic_probe(dev);
234 bus_generic_attach(dev);
235 return 0;
236 }
237
238 static int
239 nexus_print_all_resources(device_t dev)
240 {
241 struct nexus_device *ndev = DEVTONX(dev);
242 struct resource_list *rl = &ndev->nx_resources;
243 int retval = 0;
244
245 if (SLIST_FIRST(rl))
246 retval += printf(" at");
247
248 retval += resource_list_print_type(rl, "port", SYS_RES_IOPORT, "%#lx");
249 retval += resource_list_print_type(rl, "iomem", SYS_RES_MEMORY, "%#lx");
250 retval += resource_list_print_type(rl, "irq", SYS_RES_IRQ, "%ld");
251
252 return retval;
253 }
254
255 static int
256 nexus_print_child(device_t bus, device_t child)
257 {
258 int retval = 0;
259
260 retval += bus_print_child_header(bus, child);
261 retval += nexus_print_all_resources(child);
262 retval += printf(" on motherboard\n"); /* XXX "motherboard", ick */
263
264 return (retval);
265 }
266
267 static device_t
268 nexus_add_child(device_t bus, int order, const char *name, int unit)
269 {
270 device_t child;
271 struct nexus_device *ndev;
272
273 ndev = malloc(sizeof(struct nexus_device), M_NEXUSDEV, M_NOWAIT|M_ZERO);
274 if (!ndev)
275 return(0);
276 resource_list_init(&ndev->nx_resources);
277
278 child = device_add_child_ordered(bus, order, name, unit);
279
280 /* should we free this in nexus_child_detached? */
281 device_set_ivars(child, ndev);
282
283 return(child);
284 }
285
286 /*
287 * Allocate a resource on behalf of child. NB: child is usually going to be a
288 * child of one of our descendants, not a direct child of nexus0.
289 */
290 static struct resource *
291 nexus_alloc_resource(device_t bus, device_t child, int type, int *rid,
292 u_long start, u_long end, u_long count, u_int flags)
293 {
294 struct nexus_device *ndev = DEVTONX(child);
295 struct resource *rv;
296 struct resource_list_entry *rle;
297 struct rman *rm;
298 int needactivate = flags & RF_ACTIVE;
299
300 /*
301 * If this is an allocation of the "default" range for a given RID, and
302 * we know what the resources for this device are (ie. they aren't maintained
303 * by a child bus), then work out the start/end values.
304 */
305 if ((start == 0UL) && (end == ~0UL) && (count == 1)) {
306 if (ndev == NULL)
307 return(NULL);
308 rle = resource_list_find(&ndev->nx_resources, type, *rid);
309 if (rle == NULL)
310 return(NULL);
311 start = rle->start;
312 end = rle->end;
313 count = rle->count;
314 }
315
316 flags &= ~RF_ACTIVE;
317
318 switch (type) {
319 case SYS_RES_IRQ:
320 rm = &irq_rman;
321 break;
322
323 case SYS_RES_DRQ:
324 rm = &drq_rman;
325 break;
326
327 case SYS_RES_IOPORT:
328 rm = &port_rman;
329 break;
330
331 case SYS_RES_MEMORY:
332 rm = &mem_rman;
333 break;
334
335 default:
336 return 0;
337 }
338
339 rv = rman_reserve_resource(rm, start, end, count, flags, child);
340 if (rv == 0)
341 return 0;
342
343 if (type == SYS_RES_MEMORY) {
344 rman_set_bustag(rv, AMD64_BUS_SPACE_MEM);
345 } else if (type == SYS_RES_IOPORT) {
346 rman_set_bustag(rv, AMD64_BUS_SPACE_IO);
347 rman_set_bushandle(rv, rman_get_start(rv));
348 }
349
350 if (needactivate) {
351 if (bus_activate_resource(child, type, *rid, rv)) {
352 rman_release_resource(rv);
353 return 0;
354 }
355 }
356
357 return rv;
358 }
359
360 static int
361 nexus_activate_resource(device_t bus, device_t child, int type, int rid,
362 struct resource *r)
363 {
364
365 /*
366 * If this is a memory resource, map it into the kernel.
367 */
368 if (rman_get_bustag(r) == AMD64_BUS_SPACE_MEM) {
369 caddr_t vaddr = 0;
370
371 if (rman_get_end(r) < 1024 * 1024) {
372 /*
373 * The first 1Mb is mapped at KERNBASE.
374 */
375 vaddr = (caddr_t)(uintptr_t)(KERNBASE + rman_get_start(r));
376 } else {
377 u_int64_t paddr;
378 u_int64_t psize;
379 u_int32_t poffs;
380
381 paddr = rman_get_start(r);
382 psize = rman_get_size(r);
383
384 poffs = paddr - trunc_page(paddr);
385 vaddr = (caddr_t) pmap_mapdev(paddr-poffs, psize+poffs) + poffs;
386 }
387 rman_set_virtual(r, vaddr);
388 rman_set_bushandle(r, (bus_space_handle_t) vaddr);
389 }
390 return (rman_activate_resource(r));
391 }
392
393 static int
394 nexus_deactivate_resource(device_t bus, device_t child, int type, int rid,
395 struct resource *r)
396 {
397 /*
398 * If this is a memory resource, unmap it.
399 */
400 if ((rman_get_bustag(r) == AMD64_BUS_SPACE_MEM) &&
401 (rman_get_end(r) >= 1024 * 1024)) {
402 u_int32_t psize;
403
404 psize = rman_get_size(r);
405 pmap_unmapdev((vm_offset_t)rman_get_virtual(r), psize);
406 }
407
408 return (rman_deactivate_resource(r));
409 }
410
411 static int
412 nexus_release_resource(device_t bus, device_t child, int type, int rid,
413 struct resource *r)
414 {
415 if (rman_get_flags(r) & RF_ACTIVE) {
416 int error = bus_deactivate_resource(child, type, rid, r);
417 if (error)
418 return error;
419 }
420 return (rman_release_resource(r));
421 }
422
423 /*
424 * Currently this uses the really grody interface from kern/kern_intr.c
425 * (which really doesn't belong in kern/anything.c). Eventually, all of
426 * the code in kern_intr.c and machdep_intr.c should get moved here, since
427 * this is going to be the official interface.
428 */
429 static int
430 nexus_setup_intr(device_t bus, device_t child, struct resource *irq,
431 int flags, void (*ihand)(void *), void *arg, void **cookiep)
432 {
433 int error;
434
435 /* somebody tried to setup an irq that failed to allocate! */
436 if (irq == NULL)
437 panic("nexus_setup_intr: NULL irq resource!");
438
439 *cookiep = 0;
440 if ((rman_get_flags(irq) & RF_SHAREABLE) == 0)
441 flags |= INTR_EXCL;
442
443 /*
444 * We depend here on rman_activate_resource() being idempotent.
445 */
446 error = rman_activate_resource(irq);
447 if (error)
448 return (error);
449
450 error = intr_add_handler(device_get_nameunit(child),
451 rman_get_start(irq), ihand, arg, flags, cookiep);
452
453 return (error);
454 }
455
456 static int
457 nexus_teardown_intr(device_t dev, device_t child, struct resource *r, void *ih)
458 {
459 return (intr_remove_handler(ih));
460 }
461
462 static int
463 nexus_config_intr(device_t dev, int irq, enum intr_trigger trig,
464 enum intr_polarity pol)
465 {
466 return (intr_config_intr(irq, trig, pol));
467 }
468
469 static struct resource_list *
470 nexus_get_reslist(device_t dev, device_t child)
471 {
472 struct nexus_device *ndev = DEVTONX(child);
473
474 return (&ndev->nx_resources);
475 }
476
477 static int
478 nexus_set_resource(device_t dev, device_t child, int type, int rid, u_long start, u_long count)
479 {
480 struct nexus_device *ndev = DEVTONX(child);
481 struct resource_list *rl = &ndev->nx_resources;
482
483 /* XXX this should return a success/failure indicator */
484 resource_list_add(rl, type, rid, start, start + count - 1, count);
485 return(0);
486 }
487
488 static int
489 nexus_get_resource(device_t dev, device_t child, int type, int rid, u_long *startp, u_long *countp)
490 {
491 struct nexus_device *ndev = DEVTONX(child);
492 struct resource_list *rl = &ndev->nx_resources;
493 struct resource_list_entry *rle;
494
495 rle = resource_list_find(rl, type, rid);
496 if (!rle)
497 return(ENOENT);
498 if (startp)
499 *startp = rle->start;
500 if (countp)
501 *countp = rle->count;
502 return(0);
503 }
504
505 static void
506 nexus_delete_resource(device_t dev, device_t child, int type, int rid)
507 {
508 struct nexus_device *ndev = DEVTONX(child);
509 struct resource_list *rl = &ndev->nx_resources;
510
511 resource_list_delete(rl, type, rid);
512 }
513
514 #ifdef DEV_ISA
515 /*
516 * Placeholder which claims PnP 'devices' which describe system
517 * resources.
518 */
519 static struct isa_pnp_id sysresource_ids[] = {
520 { 0x010cd041 /* PNP0c01 */, "System Memory" },
521 { 0x020cd041 /* PNP0c02 */, "System Resource" },
522 { 0 }
523 };
524
525 static int
526 sysresource_probe(device_t dev)
527 {
528 int result;
529
530 if ((result = ISA_PNP_PROBE(device_get_parent(dev), dev, sysresource_ids)) <= 0) {
531 device_quiet(dev);
532 }
533 return(result);
534 }
535
536 static int
537 sysresource_attach(device_t dev)
538 {
539 return(0);
540 }
541
542 static device_method_t sysresource_methods[] = {
543 /* Device interface */
544 DEVMETHOD(device_probe, sysresource_probe),
545 DEVMETHOD(device_attach, sysresource_attach),
546 DEVMETHOD(device_detach, bus_generic_detach),
547 DEVMETHOD(device_shutdown, bus_generic_shutdown),
548 DEVMETHOD(device_suspend, bus_generic_suspend),
549 DEVMETHOD(device_resume, bus_generic_resume),
550 { 0, 0 }
551 };
552
553 static driver_t sysresource_driver = {
554 "sysresource",
555 sysresource_methods,
556 1, /* no softc */
557 };
558
559 static devclass_t sysresource_devclass;
560
561 DRIVER_MODULE(sysresource, isa, sysresource_driver, sysresource_devclass, 0, 0);
562 #endif /* DEV_ISA */
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