nexus.c revision 131495 
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: head/sys/arm/arm/nexus.c 131495 2004-07-02 22:30:10Z 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
65static MALLOC_DEFINE(M_NEXUSDEV, "nexusdev", "Nexus device");
66
67struct nexus_device {
68	struct resource_list	nx_resources;
69};
70
71#define DEVTONX(dev)	((struct nexus_device *)device_get_ivars(dev))
72
73static struct rman mem_rman;
74
75static	int nexus_probe(device_t);
76static	int nexus_attach(device_t);
77static	int nexus_print_child(device_t, device_t);
78static	device_t nexus_add_child(device_t, int, const char *, int);
79static	struct resource *nexus_alloc_resource(device_t, device_t, int, int *,
80	u_long, u_long, u_long, u_int);
81static	int nexus_activate_resource(device_t, device_t, int, int,
82	struct resource *);
83static int
84nexus_setup_intr(device_t dev, device_t child, struct resource *res, int flags,
85        driver_intr_t *intr, void *arg, void **cookiep);
86static 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	{ 0, 0 }
97};
98
99static driver_t nexus_driver = {
100	"nexus",
101	nexus_methods,
102	1			/* no softc */
103};
104static devclass_t nexus_devclass;
105
106static int
107nexus_probe(device_t dev)
108{
109	device_quiet(dev);	/* suppress attach message for neatness */
110
111	mem_rman.rm_start = 0;
112	mem_rman.rm_end = ~0u;
113	mem_rman.rm_type = RMAN_ARRAY;
114	mem_rman.rm_descr = "I/O memory addresses";
115	if (rman_init(&mem_rman)
116		|| rman_manage_region(&mem_rman, 0, ~0u))
117		panic("nexus_probe mem_rman");
118
119	return (0);
120	return bus_generic_probe(dev);
121}
122
123static int
124nexus_setup_intr(device_t dev, device_t child, struct resource *res, int flags,
125    driver_intr_t *intr, void *arg, void **cookiep)
126{
127	arm_setup_irqhandler(device_get_nameunit(child),
128	    intr, arg, res->r_start, flags, cookiep);
129	return (0);
130}
131
132
133static int
134nexus_attach(device_t dev)
135{
136	/*
137	 * First, deal with the children we know about already
138	 */
139	bus_generic_probe(dev);
140	bus_generic_attach(dev);
141
142	return 0;
143}
144
145
146static int
147nexus_print_child(device_t bus, device_t child)
148{
149	int retval = 0;
150
151	retval += bus_print_child_header(bus, child);
152	retval += printf(" on motherboard\n");	/* XXX "motherboard", ick */
153
154	return (retval);
155}
156
157
158static device_t
159nexus_add_child(device_t bus, int order, const char *name, int unit)
160{
161	device_t	child;
162	struct nexus_device *ndev;
163
164	ndev = malloc(sizeof(struct nexus_device), M_NEXUSDEV, M_NOWAIT|M_ZERO);
165	if (!ndev)
166		return(0);
167	resource_list_init(&ndev->nx_resources);
168
169	child = device_add_child_ordered(bus, order, name, unit);
170
171	/* should we free this in nexus_child_detached? */
172	device_set_ivars(child, ndev);
173
174	return(child);
175}
176
177
178/*
179 * Allocate a resource on behalf of child.  NB: child is usually going to be a
180 * child of one of our descendants, not a direct child of nexus0.
181 * (Exceptions include footbridge.)
182 */
183#define ARM_BUS_SPACE_MEM 1
184static struct resource *
185nexus_alloc_resource(device_t bus, device_t child, int type, int *rid,
186	u_long start, u_long end, u_long count, u_int flags)
187{
188	struct resource *rv;
189	struct rman *rm;
190	int needactivate = flags & RF_ACTIVE;
191
192	switch (type) {
193	case SYS_RES_MEMORY:
194		rm = &mem_rman;
195		break;
196
197	default:
198		return 0;
199	}
200
201	rv = rman_reserve_resource(rm, start, end, count, flags, child);
202	if (rv == 0)
203		return 0;
204
205	rman_set_bustag(rv, (void*)ARM_BUS_SPACE_MEM);
206	rman_set_bushandle(rv, rv->r_start);
207
208	if (needactivate) {
209		if (bus_activate_resource(child, type, *rid, rv)) {
210			rman_release_resource(rv);
211			return 0;
212		}
213	}
214
215	return rv;
216}
217
218
219static int
220nexus_activate_resource(device_t bus, device_t child, int type, int rid,
221	struct resource *r)
222{
223	/*
224	 * If this is a memory resource, map it into the kernel.
225	 */
226	if (rman_get_bustag(r) == (void*)ARM_BUS_SPACE_MEM) {
227		caddr_t vaddr = 0;
228		u_int32_t paddr;
229		u_int32_t psize;
230		u_int32_t poffs;
231
232		paddr = rman_get_start(r);
233		psize = rman_get_size(r);
234		poffs = paddr - trunc_page(paddr);
235		vaddr = (caddr_t) pmap_mapdev(paddr-poffs, psize+poffs) + poffs;
236		rman_set_virtual(r, vaddr);
237		rman_set_bushandle(r, (bus_space_handle_t) vaddr);
238	}
239	return (rman_activate_resource(r));
240}
241
242DRIVER_MODULE(nexus, root, nexus_driver, nexus_devclass, 0, 0);
243