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: releng/6.2/sys/arm/arm/nexus.c 147166 2005-06-09 12:26:20Z cognet $");
44
45 #define __RMAN_RESOURCE_VISIBLE
46 #include <sys/param.h>
47 #include <sys/systm.h>
48 #include <sys/bus.h>
49 #include <sys/kernel.h>
50 #include <sys/malloc.h>
51 #include <sys/module.h>
52 #include <machine/bus.h>
53 #include <sys/rman.h>
54 #include <sys/interrupt.h>
55
56 #include <machine/vmparam.h>
57 #include <machine/pcb.h>
58 #include <vm/vm.h>
59 #include <vm/pmap.h>
60 #include <machine/pmap.h>
61
62 #include <machine/resource.h>
63 #include <machine/intr.h>
64
65 static MALLOC_DEFINE(M_NEXUSDEV, "nexusdev", "Nexus device");
66
67 struct nexus_device {
68 struct resource_list nx_resources;
69 };
70
71 #define DEVTONX(dev) ((struct nexus_device *)device_get_ivars(dev))
72
73 static struct rman mem_rman;
74
75 static int nexus_probe(device_t);
76 static int nexus_attach(device_t);
77 static int nexus_print_child(device_t, device_t);
78 static device_t nexus_add_child(device_t, int, const char *, int);
79 static struct resource *nexus_alloc_resource(device_t, device_t, int, int *,
80 u_long, u_long, u_long, u_int);
81 static int nexus_activate_resource(device_t, device_t, int, int,
82 struct resource *);
83 static int
84 nexus_setup_intr(device_t dev, device_t child, struct resource *res, int flags,
85 driver_intr_t *intr, void *arg, void **cookiep);
86 static int
87 nexus_teardown_intr(device_t, device_t, struct resource *, void *);
88
89 static device_method_t nexus_methods[] = {
90 /* Device interface */
91 DEVMETHOD(device_probe, nexus_probe),
92 DEVMETHOD(device_attach, nexus_attach),
93 /* Bus interface */
94 DEVMETHOD(bus_print_child, nexus_print_child),
95 DEVMETHOD(bus_add_child, nexus_add_child),
96 DEVMETHOD(bus_alloc_resource, nexus_alloc_resource),
97 DEVMETHOD(bus_activate_resource, nexus_activate_resource),
98 DEVMETHOD(bus_setup_intr, nexus_setup_intr),
99 DEVMETHOD(bus_teardown_intr, nexus_teardown_intr),
100 { 0, 0 }
101 };
102
103 static driver_t nexus_driver = {
104 "nexus",
105 nexus_methods,
106 1 /* no softc */
107 };
108 static devclass_t nexus_devclass;
109
110 static int
111 nexus_probe(device_t dev)
112 {
113 device_quiet(dev); /* suppress attach message for neatness */
114
115 mem_rman.rm_start = 0;
116 mem_rman.rm_end = ~0u;
117 mem_rman.rm_type = RMAN_ARRAY;
118 mem_rman.rm_descr = "I/O memory addresses";
119 if (rman_init(&mem_rman)
120 || rman_manage_region(&mem_rman, 0, ~0u))
121 panic("nexus_probe mem_rman");
122
123 return (0);
124 return bus_generic_probe(dev);
125 }
126
127 static int
128 nexus_setup_intr(device_t dev, device_t child, struct resource *res, int flags,
129 driver_intr_t *intr, void *arg, void **cookiep)
130 {
131 arm_setup_irqhandler(device_get_nameunit(child),
132 intr, arg, res->r_start, flags, cookiep);
133 return (0);
134 }
135
136 static int
137 nexus_teardown_intr(device_t dev, device_t child, struct resource *r, void *ih)
138 {
139 int error;
140
141 arm_mask_irq(r->r_start);
142 error = arm_remove_irqhandler(ih);
143 return (error);
144 }
145
146 static int
147 nexus_attach(device_t dev)
148 {
149 /*
150 * First, deal with the children we know about already
151 */
152 bus_generic_probe(dev);
153 bus_generic_attach(dev);
154
155 return 0;
156 }
157
158
159 static int
160 nexus_print_child(device_t bus, device_t child)
161 {
162 int retval = 0;
163
164 retval += bus_print_child_header(bus, child);
165 retval += printf(" on motherboard\n"); /* XXX "motherboard", ick */
166
167 return (retval);
168 }
169
170
171 static device_t
172 nexus_add_child(device_t bus, int order, const char *name, int unit)
173 {
174 device_t child;
175 struct nexus_device *ndev;
176
177 ndev = malloc(sizeof(struct nexus_device), M_NEXUSDEV, M_NOWAIT|M_ZERO);
178 if (!ndev)
179 return(0);
180 resource_list_init(&ndev->nx_resources);
181
182 child = device_add_child_ordered(bus, order, name, unit);
183
184 /* should we free this in nexus_child_detached? */
185 device_set_ivars(child, ndev);
186
187 return(child);
188 }
189
190
191 /*
192 * Allocate a resource on behalf of child. NB: child is usually going to be a
193 * child of one of our descendants, not a direct child of nexus0.
194 * (Exceptions include footbridge.)
195 */
196 #define ARM_BUS_SPACE_MEM 1
197 static struct resource *
198 nexus_alloc_resource(device_t bus, device_t child, int type, int *rid,
199 u_long start, u_long end, u_long count, u_int flags)
200 {
201 struct resource *rv;
202 struct rman *rm;
203 int needactivate = flags & RF_ACTIVE;
204
205 switch (type) {
206 case SYS_RES_MEMORY:
207 rm = &mem_rman;
208 break;
209
210 default:
211 return 0;
212 }
213
214 rv = rman_reserve_resource(rm, start, end, count, flags, child);
215 if (rv == 0)
216 return 0;
217
218 rman_set_bustag(rv, (void*)ARM_BUS_SPACE_MEM);
219 rman_set_bushandle(rv, rv->r_start);
220
221 if (needactivate) {
222 if (bus_activate_resource(child, type, *rid, rv)) {
223 rman_release_resource(rv);
224 return 0;
225 }
226 }
227
228 return rv;
229 }
230
231
232 static int
233 nexus_activate_resource(device_t bus, device_t child, int type, int rid,
234 struct resource *r)
235 {
236 /*
237 * If this is a memory resource, map it into the kernel.
238 */
239 if (rman_get_bustag(r) == (void*)ARM_BUS_SPACE_MEM) {
240 caddr_t vaddr = 0;
241 u_int32_t paddr;
242 u_int32_t psize;
243 u_int32_t poffs;
244
245 paddr = rman_get_start(r);
246 psize = rman_get_size(r);
247 poffs = paddr - trunc_page(paddr);
248 vaddr = (caddr_t) pmap_mapdev(paddr-poffs, psize+poffs) + poffs;
249 rman_set_virtual(r, vaddr);
250 rman_set_bushandle(r, (bus_space_handle_t) vaddr);
251 }
252 return (rman_activate_resource(r));
253 }
254
255 DRIVER_MODULE(nexus, root, nexus_driver, nexus_devclass, 0, 0);
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