nexus.c revision 266128 
1/*-
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>.
5 * All rights reserved.
6 *
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
17 * warranty.
18 *
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
30 * SUCH DAMAGE.
31 *
32 * 	from: FreeBSD: src/sys/i386/i386/nexus.c,v 1.43 2001/02/09
33 */
34
35#include <sys/cdefs.h>
36__FBSDID("$FreeBSD: stable/10/sys/powerpc/powerpc/nexus.c 266128 2014-05-15 14:26:11Z ian $");
37
38#include <sys/param.h>
39#include <sys/systm.h>
40#include <sys/bus.h>
41#include <sys/kernel.h>
42#include <sys/malloc.h>
43#include <sys/module.h>
44#include <sys/pcpu.h>
45#include <sys/rman.h>
46
47#include <vm/vm.h>
48#include <vm/pmap.h>
49
50#include <dev/ofw/ofw_bus.h>
51#include <dev/ofw/ofw_bus_subr.h>
52#include <dev/ofw/ofw_nexus.h>
53#include <dev/ofw/openfirm.h>
54
55#include <machine/bus.h>
56#include <machine/intr_machdep.h>
57#include <machine/resource.h>
58
59/*
60 * The nexus (which is a pseudo-bus actually) iterates over the nodes that
61 * hang from the Open Firmware root node and adds them as devices to this bus
62 * (except some special nodes which are excluded) so that drivers can be
63 * attached to them.
64 *
65 * Additionally, interrupt setup/teardown and some resource management are
66 * done at this level.
67 */
68
69static bus_setup_intr_t nexus_setup_intr;
70static bus_teardown_intr_t nexus_teardown_intr;
71static bus_activate_resource_t nexus_activate_resource;
72static bus_deactivate_resource_t nexus_deactivate_resource;
73#ifdef SMP
74static bus_bind_intr_t nexus_bind_intr;
75#endif
76static bus_config_intr_t nexus_config_intr;
77static ofw_bus_map_intr_t nexus_ofw_map_intr;
78
79static device_method_t nexus_methods[] = {
80	/* Bus interface */
81	DEVMETHOD(bus_activate_resource,	nexus_activate_resource),
82	DEVMETHOD(bus_deactivate_resource,	nexus_deactivate_resource),
83	DEVMETHOD(bus_setup_intr,	nexus_setup_intr),
84	DEVMETHOD(bus_teardown_intr,	nexus_teardown_intr),
85#ifdef SMP
86	DEVMETHOD(bus_bind_intr,	nexus_bind_intr),
87#endif
88	DEVMETHOD(bus_config_intr,	nexus_config_intr),
89
90	/* ofw_bus interface */
91	DEVMETHOD(ofw_bus_map_intr,	nexus_ofw_map_intr),
92
93	DEVMETHOD_END
94};
95
96static devclass_t nexus_devclass;
97
98DEFINE_CLASS_1(nexus, nexus_driver, nexus_methods,
99    sizeof(struct ofw_nexus_softc), ofw_nexus_driver);
100EARLY_DRIVER_MODULE(nexus, root, nexus_driver, nexus_devclass, 0, 0,
101    BUS_PASS_BUS);
102MODULE_VERSION(nexus, 1);
103
104static int
105nexus_setup_intr(device_t bus __unused, device_t child, struct resource *r,
106    int flags, driver_filter_t *filt, driver_intr_t *intr, void *arg,
107    void **cookiep)
108{
109	int error;
110
111	if (r == NULL)
112		panic("%s: NULL interrupt resource!", __func__);
113
114	if ((rman_get_flags(r) & RF_SHAREABLE) == 0)
115		flags |= INTR_EXCL;
116
117	/* We depend here on rman_activate_resource() being idempotent. */
118	error = rman_activate_resource(r);
119	if (error)
120		return (error);
121
122	error = powerpc_setup_intr(device_get_nameunit(child),
123	    rman_get_start(r), filt, intr, arg, flags, cookiep);
124
125	return (error);
126}
127
128static int
129nexus_teardown_intr(device_t bus __unused, device_t child __unused,
130    struct resource *r, void *ih)
131{
132
133	if (r == NULL)
134		return (EINVAL);
135
136	return (powerpc_teardown_intr(ih));
137}
138
139#ifdef SMP
140static int
141nexus_bind_intr(device_t bus __unused, device_t child __unused,
142    struct resource *r, int cpu)
143{
144
145	return (powerpc_bind_intr(rman_get_start(r), cpu));
146}
147#endif
148
149static int
150nexus_config_intr(device_t dev, int irq, enum intr_trigger trig,
151    enum intr_polarity pol)
152{
153
154	return (powerpc_config_intr(irq, trig, pol));
155}
156
157static int
158nexus_ofw_map_intr(device_t dev, device_t child, phandle_t iparent, int icells,
159    pcell_t *irq)
160{
161	u_int intr = MAP_IRQ(iparent, irq[0]);
162	if (icells > 1)
163		powerpc_fw_config_intr(intr, irq[1]);
164	return (intr);
165}
166
167static int
168nexus_activate_resource(device_t bus __unused, device_t child __unused,
169    int type, int rid __unused, struct resource *r)
170{
171
172	if (type == SYS_RES_MEMORY) {
173		vm_offset_t start;
174		void *p;
175
176		start = (vm_offset_t) rman_get_start(r);
177		if (bootverbose)
178			printf("nexus mapdev: start %zx, len %ld\n", start,
179			    rman_get_size(r));
180
181		p = pmap_mapdev(start, (vm_size_t) rman_get_size(r));
182		if (p == NULL)
183			return (ENOMEM);
184		rman_set_virtual(r, p);
185		rman_set_bustag(r, &bs_be_tag);
186		rman_set_bushandle(r, (u_long)p);
187	}
188	return (rman_activate_resource(r));
189}
190
191static int
192nexus_deactivate_resource(device_t bus __unused, device_t child __unused,
193    int type __unused, int rid __unused, struct resource *r)
194{
195
196	/*
197	 * If this is a memory resource, unmap it.
198	 */
199	if ((type == SYS_RES_MEMORY) || (type == SYS_RES_IOPORT)) {
200		bus_size_t psize;
201
202		psize = rman_get_size(r);
203		pmap_unmapdev((vm_offset_t)rman_get_virtual(r), psize);
204	}
205
206	return (rman_deactivate_resource(r));
207}
208
209