FreeBSD/Linux Kernel Cross Reference
sys/arm/arm/nexus.c
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
31 /*
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.
40 */
41
42 #include <sys/cdefs.h>
43 __FBSDID("$FreeBSD$");
44
45 #include <sys/param.h>
46 #include <sys/systm.h>
47 #include <sys/bus.h>
48 #include <sys/kernel.h>
49 #include <sys/malloc.h>
50 #include <sys/module.h>
51 #include <machine/bus.h>
52 #include <sys/rman.h>
53 #include <sys/interrupt.h>
54
55 #include <machine/vmparam.h>
56 #include <machine/pcb.h>
57 #include <vm/vm.h>
58 #include <vm/pmap.h>
59 #include <machine/pmap.h>
60
61 #include <machine/resource.h>
62 #include <machine/intr.h>
63
64 static MALLOC_DEFINE(M_NEXUSDEV, "nexusdev", "Nexus device");
65
66 struct nexus_device {
67 struct resource_list nx_resources;
68 };
69
70 #define DEVTONX(dev) ((struct nexus_device *)device_get_ivars(dev))
71
72 static struct rman mem_rman;
73
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, u_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,
81 struct resource *);
82 static int nexus_setup_intr(device_t dev, device_t child, struct resource *res,
83 int flags, driver_filter_t *filt, driver_intr_t *intr, void *arg, void **cookiep);
84 static int nexus_teardown_intr(device_t, device_t, struct resource *, void *);
85
86 static device_method_t nexus_methods[] = {
87 /* Device interface */
88 DEVMETHOD(device_probe, nexus_probe),
89 DEVMETHOD(device_attach, nexus_attach),
90 /* Bus interface */
91 DEVMETHOD(bus_print_child, nexus_print_child),
92 DEVMETHOD(bus_add_child, nexus_add_child),
93 DEVMETHOD(bus_alloc_resource, nexus_alloc_resource),
94 DEVMETHOD(bus_activate_resource, nexus_activate_resource),
95 DEVMETHOD(bus_setup_intr, nexus_setup_intr),
96 DEVMETHOD(bus_teardown_intr, nexus_teardown_intr),
97 { 0, 0 }
98 };
99
100 static driver_t nexus_driver = {
101 "nexus",
102 nexus_methods,
103 1 /* no softc */
104 };
105 static devclass_t nexus_devclass;
106
107 static int
108 nexus_probe(device_t dev)
109 {
110 device_quiet(dev); /* suppress attach message for neatness */
111
112 mem_rman.rm_start = 0;
113 mem_rman.rm_end = ~0ul;
114 mem_rman.rm_type = RMAN_ARRAY;
115 mem_rman.rm_descr = "I/O memory addresses";
116 if (rman_init(&mem_rman) || rman_manage_region(&mem_rman, 0, ~0))
117 panic("nexus_probe mem_rman");
118
119 return (0);
120 }
121
122 static int
123 nexus_setup_intr(device_t dev, device_t child, struct resource *res, int flags,
124 driver_filter_t *filt, driver_intr_t *intr, void *arg, void **cookiep)
125 {
126
127 if ((rman_get_flags(res) & RF_SHAREABLE) == 0)
128 flags |= INTR_EXCL;
129
130 arm_setup_irqhandler(device_get_nameunit(child),
131 filt, intr, arg, rman_get_start(res), flags, cookiep);
132 return (0);
133 }
134
135 static int
136 nexus_teardown_intr(device_t dev, device_t child, struct resource *r, void *ih)
137 {
138
139 return (arm_remove_irqhandler(rman_get_start(r), ih));
140 }
141
142 static int
143 nexus_attach(device_t dev)
144 {
145
146 /*
147 * First, deal with the children we know about already
148 */
149 bus_generic_probe(dev);
150 bus_generic_attach(dev);
151
152 return (0);
153 }
154
155
156 static int
157 nexus_print_child(device_t bus, device_t child)
158 {
159 int retval = 0;
160
161 retval += bus_print_child_header(bus, child);
162 retval += printf(" on motherboard\n"); /* XXX "motherboard", ick */
163
164 return (retval);
165 }
166
167 static device_t
168 nexus_add_child(device_t bus, u_int order, const char *name, int unit)
169 {
170 device_t child;
171 struct nexus_device *ndev;
172
173 ndev = malloc(sizeof(struct nexus_device), M_NEXUSDEV, M_NOWAIT|M_ZERO);
174 if (!ndev)
175 return (0);
176 resource_list_init(&ndev->nx_resources);
177
178 child = device_add_child_ordered(bus, order, name, unit);
179
180 /* should we free this in nexus_child_detached? */
181 device_set_ivars(child, ndev);
182
183 return (child);
184 }
185
186
187 /*
188 * Allocate a resource on behalf of child. NB: child is usually going to be a
189 * child of one of our descendants, not a direct child of nexus0.
190 * (Exceptions include footbridge.)
191 */
192 #define ARM_BUS_SPACE_MEM 1
193 static struct resource *
194 nexus_alloc_resource(device_t bus, device_t child, int type, int *rid,
195 u_long start, u_long end, u_long count, u_int flags)
196 {
197 struct resource *rv;
198 struct rman *rm;
199 int needactivate = flags & RF_ACTIVE;
200
201 switch (type) {
202 case SYS_RES_MEMORY:
203 rm = &mem_rman;
204 break;
205
206 default:
207 return (0);
208 }
209
210 rv = rman_reserve_resource(rm, start, end, count, flags, child);
211 if (rv == 0)
212 return (0);
213
214 rman_set_rid(rv, *rid);
215 rman_set_bustag(rv, (void*)ARM_BUS_SPACE_MEM);
216 rman_set_bushandle(rv, rman_get_start(rv));
217
218 if (needactivate) {
219 if (bus_activate_resource(child, type, *rid, rv)) {
220 rman_release_resource(rv);
221 return (0);
222 }
223 }
224
225 return (rv);
226 }
227
228
229 static int
230 nexus_activate_resource(device_t bus, device_t child, int type, int rid,
231 struct resource *r)
232 {
233 /*
234 * If this is a memory resource, map it into the kernel.
235 */
236 if (rman_get_bustag(r) == (void*)ARM_BUS_SPACE_MEM) {
237 caddr_t vaddr = 0;
238 u_int32_t paddr;
239 u_int32_t psize;
240 u_int32_t poffs;
241
242 paddr = rman_get_start(r);
243 psize = rman_get_size(r);
244 poffs = paddr - trunc_page(paddr);
245 vaddr = (caddr_t) pmap_mapdev(paddr-poffs, psize+poffs) + poffs;
246 rman_set_virtual(r, vaddr);
247 rman_set_bushandle(r, (bus_space_handle_t) vaddr);
248 }
249 return (rman_activate_resource(r));
250 }
251
252 DRIVER_MODULE(nexus, root, nexus_driver, nexus_devclass, 0, 0);
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