2 * Copyright 1998 Massachusetts Institute of Technology
3 * Copyright 2001 by Thomas Moestl <tmm@FreeBSD.org>.
4 * Copyright 2006 by Marius Strobl <marius@FreeBSD.org>.
7 * Permission to use, copy, modify, and distribute this software and
8 * its documentation for any purpose and without fee is hereby
9 * granted, provided that both the above copyright notice and this
10 * permission notice appear in all copies, that both the above
11 * copyright notice and this permission notice appear in all
12 * supporting documentation, and that the name of M.I.T. not be used
13 * in advertising or publicity pertaining to distribution of the
14 * software without specific, written prior permission. M.I.T. makes
15 * no representations about the suitability of this software for any
16 * purpose. It is provided "as is" without express or implied
19 * THIS SOFTWARE IS PROVIDED BY M.I.T. ``AS IS''. M.I.T. DISCLAIMS
20 * ALL EXPRESS OR IMPLIED WARRANTIES WITH REGARD TO THIS SOFTWARE,
21 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
22 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT
23 * SHALL M.I.T. BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
24 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
25 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
26 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
27 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
28 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
29 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * from: FreeBSD: src/sys/i386/i386/nexus.c,v 1.43 2001/02/09
35 #include <sys/cdefs.h>
36 __FBSDID("$FreeBSD$");
38 #include <sys/endian.h>
39 #include <sys/param.h>
40 #include <sys/systm.h>
43 #include <sys/kernel.h>
44 #include <sys/malloc.h>
45 #include <sys/module.h>
53 #include <dev/ofw/ofw_bus.h>
54 #include <dev/ofw/ofw_bus_subr.h>
55 #include <dev/ofw/openfirm.h>
57 #include <machine/bus.h>
58 #include <machine/intr_machdep.h>
59 #include <machine/resource.h>
62 * The nexus handles root-level resource allocation requests and interrupt
63 * mapping. All direct subdevices of nexus are attached by DEVICE_IDENTIFY().
66 static struct rman intr_rman;
67 static struct rman mem_rman;
69 static device_probe_t nexus_probe;
70 static device_attach_t nexus_attach;
71 static bus_setup_intr_t nexus_setup_intr;
72 static bus_teardown_intr_t nexus_teardown_intr;
73 static bus_alloc_resource_t nexus_alloc_resource;
74 static bus_activate_resource_t nexus_activate_resource;
75 static bus_deactivate_resource_t nexus_deactivate_resource;
76 static bus_adjust_resource_t nexus_adjust_resource;
77 static bus_release_resource_t nexus_release_resource;
78 static int nexus_map_resource(device_t bus, device_t child, int type,
80 struct resource_map_request *argsp,
81 struct resource_map *map);
82 static int nexus_unmap_resource(device_t bus, device_t child, int type,
83 struct resource *r, struct resource_map *map);
85 static bus_space_tag_t nexus_get_bus_tag(device_t, device_t);
87 static bus_bind_intr_t nexus_bind_intr;
89 static bus_config_intr_t nexus_config_intr;
90 static ofw_bus_map_intr_t nexus_ofw_map_intr;
92 static device_method_t nexus_methods[] = {
93 /* Device interface */
94 DEVMETHOD(device_probe, nexus_probe),
95 DEVMETHOD(device_attach, nexus_attach),
98 DEVMETHOD(bus_add_child, bus_generic_add_child),
99 DEVMETHOD(bus_alloc_resource, nexus_alloc_resource),
100 DEVMETHOD(bus_activate_resource, nexus_activate_resource),
101 DEVMETHOD(bus_deactivate_resource, nexus_deactivate_resource),
102 DEVMETHOD(bus_adjust_resource, nexus_adjust_resource),
103 DEVMETHOD(bus_release_resource, nexus_release_resource),
104 DEVMETHOD(bus_map_resource, nexus_map_resource),
105 DEVMETHOD(bus_unmap_resource, nexus_unmap_resource),
106 DEVMETHOD(bus_setup_intr, nexus_setup_intr),
107 DEVMETHOD(bus_teardown_intr, nexus_teardown_intr),
109 DEVMETHOD(bus_bind_intr, nexus_bind_intr),
111 DEVMETHOD(bus_config_intr, nexus_config_intr),
112 DEVMETHOD(bus_get_bus_tag, nexus_get_bus_tag),
114 /* ofw_bus interface */
115 DEVMETHOD(ofw_bus_map_intr, nexus_ofw_map_intr),
120 DEFINE_CLASS_0(nexus, nexus_driver, nexus_methods, 1);
121 EARLY_DRIVER_MODULE(nexus, root, nexus_driver, 0, 0, BUS_PASS_BUS);
122 MODULE_VERSION(nexus, 1);
125 nexus_probe(device_t dev)
128 device_quiet(dev); /* suppress attach message for neatness */
130 return (BUS_PROBE_DEFAULT);
134 nexus_attach(device_t dev)
137 intr_rman.rm_type = RMAN_ARRAY;
138 intr_rman.rm_descr = "Interrupts";
139 mem_rman.rm_type = RMAN_ARRAY;
140 mem_rman.rm_descr = "I/O memory addresses";
141 if (rman_init(&intr_rman) != 0 || rman_init(&mem_rman) != 0 ||
142 rman_manage_region(&intr_rman, 0, ~0) != 0 ||
143 rman_manage_region(&mem_rman, 0, BUS_SPACE_MAXADDR) != 0)
144 panic("%s: failed to set up rmans.", __func__);
147 device_add_child(dev, "ofwbus", 0);
149 /* Now, probe children. */
150 bus_generic_probe(dev);
151 bus_generic_attach(dev);
157 nexus_setup_intr(device_t bus __unused, device_t child, struct resource *r,
158 int flags, driver_filter_t *filt, driver_intr_t *intr, void *arg,
164 panic("%s: NULL interrupt resource!", __func__);
168 if ((rman_get_flags(r) & RF_SHAREABLE) == 0)
171 /* We depend here on rman_activate_resource() being idempotent. */
172 error = rman_activate_resource(r);
176 if (bus_get_domain(child, &domain) != 0) {
178 device_printf(child, "no domain found\n");
181 error = powerpc_setup_intr(device_get_nameunit(child),
182 rman_get_start(r), filt, intr, arg, flags, cookiep, domain);
188 nexus_teardown_intr(device_t bus __unused, device_t child __unused,
189 struct resource *r, void *ih)
195 return (powerpc_teardown_intr(ih));
198 static bus_space_tag_t
199 nexus_get_bus_tag(device_t bus __unused, device_t child __unused)
202 #if BYTE_ORDER == LITTLE_ENDIAN
211 nexus_bind_intr(device_t bus __unused, device_t child __unused,
212 struct resource *r, int cpu)
215 return (powerpc_bind_intr(rman_get_start(r), cpu));
220 nexus_config_intr(device_t dev, int irq, enum intr_trigger trig,
221 enum intr_polarity pol)
224 return (powerpc_config_intr(irq, trig, pol));
228 nexus_ofw_map_intr(device_t dev, device_t child, phandle_t iparent, int icells,
231 u_int intr = MAP_IRQ(iparent, irq[0]);
233 powerpc_fw_config_intr(intr, irq[1]);
238 * Allocate a resource on behalf of child. NB: child is usually going to be a
239 * child of one of our descendants, not a direct child of nexus0.
241 static struct resource *
242 nexus_alloc_resource(device_t bus, device_t child, int type, int *rid,
243 rman_res_t start, rman_res_t end, rman_res_t count, u_int flags)
259 rv = rman_reserve_resource(rm, start, end, count, flags & ~RF_ACTIVE,
263 rman_set_rid(rv, *rid);
265 if ((flags & RF_ACTIVE) != 0) {
266 if (bus_activate_resource(child, type, *rid, rv) != 0) {
267 rman_release_resource(rv);
276 nexus_activate_resource(device_t bus __unused, device_t child __unused,
277 int type, int rid __unused, struct resource *r)
280 if (type == SYS_RES_MEMORY) {
284 start = (vm_paddr_t) rman_get_start(r);
286 printf("nexus mapdev: start %jx, len %jd\n",
287 (uintmax_t)start, rman_get_size(r));
289 p = pmap_mapdev(start, (vm_size_t) rman_get_size(r));
292 rman_set_virtual(r, p);
293 rman_set_bustag(r, &bs_be_tag);
294 rman_set_bushandle(r, (u_long)p);
296 return (rman_activate_resource(r));
300 nexus_deactivate_resource(device_t bus __unused, device_t child __unused,
301 int type __unused, int rid __unused, struct resource *r)
305 * If this is a memory resource, unmap it.
307 if ((type == SYS_RES_MEMORY) || (type == SYS_RES_IOPORT)) {
310 psize = rman_get_size(r);
311 pmap_unmapdev(rman_get_virtual(r), psize);
314 return (rman_deactivate_resource(r));
318 nexus_adjust_resource(device_t bus, device_t child __unused, int type,
319 struct resource *r, rman_res_t start, rman_res_t end)
335 if (rman_is_region_manager(r, rm) == 0)
337 return (rman_adjust_resource(r, start, end));
341 nexus_release_resource(device_t bus, device_t child, int type,
342 int rid, struct resource *r)
346 if ((rman_get_flags(r) & RF_ACTIVE) != 0) {
347 error = bus_deactivate_resource(child, type, rid, r);
351 return (rman_release_resource(r));
355 nexus_map_resource(device_t bus, device_t child, int type, struct resource *r,
356 struct resource_map_request *argsp, struct resource_map *map)
359 struct resource_map_request args;
360 rman_res_t end, length, start;
362 /* Resources must be active to be mapped. */
363 if (!(rman_get_flags(r) & RF_ACTIVE))
366 /* Mappings are only supported on I/O and memory resources. */
375 resource_init_map_request(&args);
377 bcopy(argsp, &args, imin(argsp->size, args.size));
379 start = rman_get_start(r) + args.offset;
380 if (args.length == 0)
381 length = rman_get_size(r);
383 length = args.length;
385 end = start + length - 1;
386 if (start > rman_get_end(r) || start < rman_get_start(r))
389 if (end > rman_get_end(r) || end < start)
393 * If this is a memory resource, map it into the kernel.
397 panic("%s:%d SYS_RES_IOPORT handling not implemented", __func__, __LINE__);
399 map->r_bushandle = start;
400 map->r_bustag = nexus_get_bus_tag(NULL, NULL);
401 map->r_size = length;
406 map->r_vaddr = pmap_mapdev_attr(start, length, args.memattr);
407 map->r_bustag = nexus_get_bus_tag(NULL, NULL);
408 map->r_size = length;
409 map->r_bushandle = (bus_space_handle_t)map->r_vaddr;
418 nexus_unmap_resource(device_t bus, device_t child, int type, struct resource *r,
419 struct resource_map *map)
423 * If this is a memory resource, unmap it.
427 pmap_unmapdev(map->r_vaddr, map->r_size);