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
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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
32 * This code implements a `root nexus' for Arm Architecture
33 * machines. The function of the root nexus is to serve as an
34 * attachment point for both processors and buses, and to manage
35 * resources which are common to all of them. In particular,
36 * this code implements the core resource managers for interrupt
37 * requests, DMA requests (which rightfully should be a part of the
38 * ISA code but it's easier to do it here for now), I/O port addresses,
39 * and I/O memory address space.
42 #include <sys/cdefs.h>
43 __FBSDID("$FreeBSD$");
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>
53 #include <sys/interrupt.h>
55 #include <machine/vmparam.h>
56 #include <machine/pcb.h>
59 #include <machine/pmap.h>
61 #include <machine/resource.h>
62 #include <machine/intr.h>
64 static MALLOC_DEFINE(M_NEXUSDEV, "nexusdev", "Nexus device");
67 struct resource_list nx_resources;
70 #define DEVTONX(dev) ((struct nexus_device *)device_get_ivars(dev))
72 static struct rman mem_rman;
74 static int nexus_probe(device_t);
75 static int nexus_attach(device_t);
76 static int nexus_print_child(device_t, device_t);
77 static device_t nexus_add_child(device_t, int, const char *, int);
78 static struct resource *nexus_alloc_resource(device_t, device_t, int, int *,
79 u_long, u_long, u_long, u_int);
80 static int nexus_activate_resource(device_t, device_t, int, int,
83 nexus_setup_intr(device_t dev, device_t child, struct resource *res, int flags,
84 driver_filter_t *filt, driver_intr_t *intr, void *arg, void **cookiep);
86 nexus_teardown_intr(device_t, device_t, struct resource *, void *);
88 static device_method_t nexus_methods[] = {
89 /* Device interface */
90 DEVMETHOD(device_probe, nexus_probe),
91 DEVMETHOD(device_attach, nexus_attach),
93 DEVMETHOD(bus_print_child, nexus_print_child),
94 DEVMETHOD(bus_add_child, nexus_add_child),
95 DEVMETHOD(bus_alloc_resource, nexus_alloc_resource),
96 DEVMETHOD(bus_activate_resource, nexus_activate_resource),
97 DEVMETHOD(bus_setup_intr, nexus_setup_intr),
98 DEVMETHOD(bus_teardown_intr, nexus_teardown_intr),
102 static driver_t nexus_driver = {
107 static devclass_t nexus_devclass;
110 nexus_probe(device_t dev)
112 device_quiet(dev); /* suppress attach message for neatness */
114 mem_rman.rm_start = 0;
115 mem_rman.rm_end = ~0u;
116 mem_rman.rm_type = RMAN_ARRAY;
117 mem_rman.rm_descr = "I/O memory addresses";
118 if (rman_init(&mem_rman)
119 || rman_manage_region(&mem_rman, 0, ~0u))
120 panic("nexus_probe mem_rman");
123 return bus_generic_probe(dev);
127 nexus_setup_intr(device_t dev, device_t child, struct resource *res, int flags,
128 driver_filter_t *filt, driver_intr_t *intr, void *arg, void **cookiep)
132 for (i = rman_get_start(res); i <= rman_get_end(res); i++)
133 arm_setup_irqhandler(device_get_nameunit(child),
134 filt, intr, arg, i, flags, cookiep);
139 nexus_teardown_intr(device_t dev, device_t child, struct resource *r, void *ih)
144 for (i = rman_get_start(r); i <= rman_get_end(r); i++)
146 error = arm_remove_irqhandler(ih);
151 nexus_attach(device_t dev)
154 * First, deal with the children we know about already
156 bus_generic_probe(dev);
157 bus_generic_attach(dev);
164 nexus_print_child(device_t bus, device_t child)
168 retval += bus_print_child_header(bus, child);
169 retval += printf(" on motherboard\n"); /* XXX "motherboard", ick */
176 nexus_add_child(device_t bus, int order, const char *name, int unit)
179 struct nexus_device *ndev;
181 ndev = malloc(sizeof(struct nexus_device), M_NEXUSDEV, M_NOWAIT|M_ZERO);
184 resource_list_init(&ndev->nx_resources);
186 child = device_add_child_ordered(bus, order, name, unit);
188 /* should we free this in nexus_child_detached? */
189 device_set_ivars(child, ndev);
196 * Allocate a resource on behalf of child. NB: child is usually going to be a
197 * child of one of our descendants, not a direct child of nexus0.
198 * (Exceptions include footbridge.)
200 #define ARM_BUS_SPACE_MEM 1
201 static struct resource *
202 nexus_alloc_resource(device_t bus, device_t child, int type, int *rid,
203 u_long start, u_long end, u_long count, u_int flags)
207 int needactivate = flags & RF_ACTIVE;
218 rv = rman_reserve_resource(rm, start, end, count, flags, child);
222 rman_set_rid(rv, *rid);
223 rman_set_bustag(rv, (void*)ARM_BUS_SPACE_MEM);
224 rman_set_bushandle(rv, rman_get_start(rv));
227 if (bus_activate_resource(child, type, *rid, rv)) {
228 rman_release_resource(rv);
238 nexus_activate_resource(device_t bus, device_t child, int type, int rid,
242 * If this is a memory resource, map it into the kernel.
244 if (rman_get_bustag(r) == (void*)ARM_BUS_SPACE_MEM) {
250 paddr = rman_get_start(r);
251 psize = rman_get_size(r);
252 poffs = paddr - trunc_page(paddr);
253 vaddr = (caddr_t) pmap_mapdev(paddr-poffs, psize+poffs) + poffs;
254 rman_set_virtual(r, vaddr);
255 rman_set_bushandle(r, (bus_space_handle_t) vaddr);
257 return (rman_activate_resource(r));
260 DRIVER_MODULE(nexus, root, nexus_driver, nexus_devclass, 0, 0);