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
6 * granted, provided that both the above copyright notice and this
7 * permission notice appear in all copies, that both the above
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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
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13 * purpose. It is provided "as is" without express or implied
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
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>
49 #include <machine/bus.h>
51 #include <sys/interrupt.h>
56 #include <machine/intr.h>
57 #include <machine/nexusvar.h>
58 #include <machine/pmap.h>
59 #include <machine/resource.h>
60 #include <machine/sapicvar.h>
61 #include <machine/vmparam.h>
63 #include <isa/isareg.h>
64 #include <sys/rtprio.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, 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_child(device_t, device_t);
79 static device_t nexus_add_child(device_t bus, int order, const char *name,
81 static struct resource *nexus_alloc_resource(device_t, device_t, int, int *,
82 u_long, u_long, u_long, u_int);
83 static int nexus_read_ivar(device_t, device_t, int, uintptr_t *);
84 static int nexus_write_ivar(device_t, device_t, int, uintptr_t);
85 static int nexus_activate_resource(device_t, device_t, int, int,
87 static int nexus_deactivate_resource(device_t, device_t, int, int,
89 static int nexus_release_resource(device_t, device_t, int, int,
91 static int nexus_setup_intr(device_t, device_t, struct resource *, int flags,
92 driver_filter_t filter, void (*)(void *), void *,
94 static int nexus_teardown_intr(device_t, device_t, struct resource *,
96 static struct resource_list *nexus_get_reslist(device_t dev, device_t child);
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 *,
100 static void nexus_delete_resource(device_t, device_t, int, int);
101 static int nexus_config_intr(device_t, int, enum intr_trigger,
104 static device_method_t nexus_methods[] = {
105 /* Device interface */
106 DEVMETHOD(device_probe, nexus_probe),
107 DEVMETHOD(device_attach, nexus_attach),
108 DEVMETHOD(device_detach, bus_generic_detach),
109 DEVMETHOD(device_shutdown, bus_generic_shutdown),
110 DEVMETHOD(device_suspend, bus_generic_suspend),
111 DEVMETHOD(device_resume, bus_generic_resume),
114 DEVMETHOD(bus_print_child, nexus_print_child),
115 DEVMETHOD(bus_add_child, nexus_add_child),
116 DEVMETHOD(bus_read_ivar, nexus_read_ivar),
117 DEVMETHOD(bus_write_ivar, nexus_write_ivar),
118 DEVMETHOD(bus_alloc_resource, nexus_alloc_resource),
119 DEVMETHOD(bus_release_resource, nexus_release_resource),
120 DEVMETHOD(bus_activate_resource, nexus_activate_resource),
121 DEVMETHOD(bus_deactivate_resource, nexus_deactivate_resource),
122 DEVMETHOD(bus_setup_intr, nexus_setup_intr),
123 DEVMETHOD(bus_teardown_intr, nexus_teardown_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 DEVMETHOD(bus_config_intr, nexus_config_intr),
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)
146 device_quiet(dev); /* suppress attach message for neatness */
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.
155 * - Leave I/O and memory creation here, as child probes may need them.
156 * (especially eg. ACPI)
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.
166 * XXX We depend on the AT PIC driver correctly claiming IRQ 2
167 * to prevent its reuse elsewhere in the !APIC_IO case.
169 irq_rman.rm_start = 0;
170 irq_rman.rm_type = RMAN_ARRAY;
171 irq_rman.rm_descr = "Interrupt request lines";
172 irq_rman.rm_end = 255;
173 if (rman_init(&irq_rman)
174 || rman_manage_region(&irq_rman,
175 irq_rman.rm_start, irq_rman.rm_end))
176 panic("nexus_probe irq_rman");
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)
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)
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)
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)
221 * Mask the legacy PICs - we will use the I/O SAPIC for interrupt.
223 outb(IO_ICU1+1, 0xff);
224 outb(IO_ICU2+1, 0xff);
226 bus_generic_attach(dev);
231 nexus_print_child(device_t bus, device_t child)
233 struct nexus_device *ndev = DEVTONX(child);
234 struct resource_list *rl = &ndev->nx_resources;
237 retval += bus_print_child_header(bus, child);
238 retval += resource_list_print_type(rl, "port", SYS_RES_IOPORT, "%#lx");
239 retval += resource_list_print_type(rl, "iomem", SYS_RES_MEMORY, "%#lx");
240 retval += resource_list_print_type(rl, "irq", SYS_RES_IRQ, "%ld");
241 if (ndev->nx_pcibus != -1)
242 retval += printf(" pcibus %d", ndev->nx_pcibus);
243 if (device_get_flags(child))
244 retval += printf(" flags %#x", device_get_flags(child));
245 retval += printf(" on motherboard\n"); /* XXX "motherboard", ick */
251 nexus_add_child(device_t bus, int order, const char *name, int unit)
254 struct nexus_device *ndev;
256 ndev = malloc(sizeof(struct nexus_device), M_NEXUSDEV, M_NOWAIT|M_ZERO);
259 resource_list_init(&ndev->nx_resources);
260 ndev->nx_pcibus = -1;
262 child = device_add_child_ordered(bus, order, name, unit);
264 /* should we free this in nexus_child_detached? */
265 device_set_ivars(child, ndev);
271 nexus_read_ivar(device_t dev, device_t child, int which, uintptr_t *result)
273 struct nexus_device *ndev = DEVTONX(child);
276 case NEXUS_IVAR_PCIBUS:
277 *result = ndev->nx_pcibus;
287 nexus_write_ivar(device_t dev, device_t child, int which, uintptr_t value)
289 struct nexus_device *ndev = DEVTONX(child);
292 case NEXUS_IVAR_PCIBUS:
293 ndev->nx_pcibus = value;
303 * Allocate a resource on behalf of child. NB: child is usually going to be a
304 * child of one of our descendants, not a direct child of nexus0.
305 * (Exceptions include npx.)
307 static struct resource *
308 nexus_alloc_resource(device_t bus, device_t child, int type, int *rid,
309 u_long start, u_long end, u_long count, u_int flags)
311 struct nexus_device *ndev = DEVTONX(child);
313 struct resource_list_entry *rle;
315 int needactivate = flags & RF_ACTIVE;
318 * If this is an allocation of the "default" range for a given RID, and
319 * we know what the resources for this device are (ie. they aren't maintained
320 * by a child bus), then work out the start/end values.
322 if ((start == 0UL) && (end == ~0UL) && (count == 1)) {
325 rle = resource_list_find(&ndev->nx_resources, type, *rid);
356 rv = rman_reserve_resource(rm, start, end, count, flags, child);
359 rman_set_rid(rv, *rid);
362 if (bus_activate_resource(child, type, *rid, rv)) {
363 rman_release_resource(rv);
372 nexus_activate_resource(device_t bus, device_t child, int type, int rid,
375 vm_paddr_t paddr, psize;
379 * If this is a memory resource, map it into the kernel.
383 rman_set_bustag(r, IA64_BUS_SPACE_IO);
384 rman_set_bushandle(r, rman_get_start(r));
387 paddr = rman_get_start(r);
388 psize = rman_get_size(r);
389 vaddr = pmap_mapdev(paddr, psize);
390 rman_set_virtual(r, vaddr);
391 rman_set_bustag(r, IA64_BUS_SPACE_MEM);
392 rman_set_bushandle(r, (bus_space_handle_t) paddr);
395 return (rman_activate_resource(r));
399 nexus_deactivate_resource(device_t bus, device_t child, int type, int rid,
403 return (rman_deactivate_resource(r));
407 nexus_release_resource(device_t bus, device_t child, int type, int rid,
410 if (rman_get_flags(r) & RF_ACTIVE) {
411 int error = bus_deactivate_resource(child, type, rid, r);
415 return (rman_release_resource(r));
419 * Currently this uses the really grody interface from kern/kern_intr.c
420 * (which really doesn't belong in kern/anything.c). Eventually, all of
421 * the code in kern_intr.c and machdep_intr.c should get moved here, since
422 * this is going to be the official interface.
425 nexus_setup_intr(device_t bus, device_t child, struct resource *irq,
426 int flags, driver_filter_t filter, void (*ihand)(void *),
427 void *arg, void **cookiep)
432 /* somebody tried to setup an irq that failed to allocate! */
434 panic("nexus_setup_intr: NULL irq resource!");
437 if ((rman_get_flags(irq) & RF_SHAREABLE) == 0)
440 driver = device_get_driver(child);
443 * We depend here on rman_activate_resource() being idempotent.
445 error = rman_activate_resource(irq);
449 error = ia64_setup_intr(device_get_nameunit(child),
450 rman_get_start(irq), filter, ihand, arg, flags, cookiep);
456 nexus_teardown_intr(device_t dev, device_t child, struct resource *ires,
460 return (ia64_teardown_intr(cookie));
463 static struct resource_list *
464 nexus_get_reslist(device_t dev, device_t child)
466 struct nexus_device *ndev = DEVTONX(child);
468 return (&ndev->nx_resources);
472 nexus_set_resource(device_t dev, device_t child, int type, int rid, u_long start, u_long count)
474 struct nexus_device *ndev = DEVTONX(child);
475 struct resource_list *rl = &ndev->nx_resources;
477 /* XXX this should return a success/failure indicator */
478 resource_list_add(rl, type, rid, start, start + count - 1, count);
483 nexus_get_resource(device_t dev, device_t child, int type, int rid, u_long *startp, u_long *countp)
485 struct nexus_device *ndev = DEVTONX(child);
486 struct resource_list *rl = &ndev->nx_resources;
487 struct resource_list_entry *rle;
489 rle = resource_list_find(rl, type, rid);
490 device_printf(child, "type %d rid %d startp %p countp %p - got %p\n",
491 type, rid, startp, countp, rle);
495 *startp = rle->start;
497 *countp = rle->count;
502 nexus_delete_resource(device_t dev, device_t child, int type, int rid)
504 struct nexus_device *ndev = DEVTONX(child);
505 struct resource_list *rl = &ndev->nx_resources;
507 resource_list_delete(rl, type, rid);
511 nexus_config_intr(device_t dev, int irq, enum intr_trigger trig,
512 enum intr_polarity pol)
515 return (sapic_config_intr(irq, trig, pol));
521 * Placeholder which claims PnP 'devices' which describe system
524 static struct isa_pnp_id sysresource_ids[] = {
525 { 0x010cd041 /* PNP0c01 */, "System Memory" },
526 { 0x020cd041 /* PNP0c02 */, "System Resource" },
531 sysresource_probe(device_t dev)
535 if ((result = ISA_PNP_PROBE(device_get_parent(dev), dev, sysresource_ids)) <= 0) {
542 sysresource_attach(device_t dev)
547 static device_method_t sysresource_methods[] = {
548 /* Device interface */
549 DEVMETHOD(device_probe, sysresource_probe),
550 DEVMETHOD(device_attach, sysresource_attach),
551 DEVMETHOD(device_detach, bus_generic_detach),
552 DEVMETHOD(device_shutdown, bus_generic_shutdown),
553 DEVMETHOD(device_suspend, bus_generic_suspend),
554 DEVMETHOD(device_resume, bus_generic_resume),
558 static driver_t sysresource_driver = {
564 static devclass_t sysresource_devclass;
566 DRIVER_MODULE(sysresource, isa, sysresource_driver, sysresource_devclass, 0, 0);