1 /*-
2 * Copyright (c) 2018-2020 Ruslan Bukin <br@bsdpad.com>
3 * All rights reserved.
4 *
5 * This software was developed by BAE Systems, the University of Cambridge
6 * Computer Laboratory, and Memorial University under DARPA/AFRL contract
7 * FA8650-15-C-7558 ("CADETS"), as part of the DARPA Transparent Computing
8 * (TC) research program.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32 #include <sys/param.h>
33 #include <sys/systm.h>
34 #include <sys/bus.h>
35 #include <sys/rman.h>
36 #include <sys/kernel.h>
37 #include <sys/module.h>
38 #include <machine/bus.h>
39
40 #include <arm64/coresight/coresight.h>
41 #include <arm64/coresight/coresight_replicator.h>
42
43 #include "coresight_if.h"
44
45 static struct resource_spec replicator_spec[] = {
46 { SYS_RES_MEMORY, 0, RF_ACTIVE },
47 { -1, 0 }
48 };
49
50 static int
replicator_init(device_t dev)51 replicator_init(device_t dev)
52 {
53 struct replicator_softc *sc;
54
55 sc = device_get_softc(dev);
56
57 /* Unlock Coresight */
58 bus_write_4(sc->res, CORESIGHT_LAR, CORESIGHT_UNLOCK);
59
60 return (0);
61 }
62
63 static int
replicator_enable(device_t dev,struct endpoint * endp,struct coresight_event * event)64 replicator_enable(device_t dev, struct endpoint *endp,
65 struct coresight_event *event)
66 {
67 struct replicator_softc *sc;
68
69 sc = device_get_softc(dev);
70
71 /* Enable the port. Keep the other port disabled */
72 if (endp->reg == 0) {
73 bus_write_4(sc->res, REPLICATOR_IDFILTER0, 0x00);
74 bus_write_4(sc->res, REPLICATOR_IDFILTER1, 0xff);
75 } else {
76 bus_write_4(sc->res, REPLICATOR_IDFILTER0, 0xff);
77 bus_write_4(sc->res, REPLICATOR_IDFILTER1, 0x00);
78 }
79
80 return (0);
81 }
82
83 static void
replicator_disable(device_t dev,struct endpoint * endp,struct coresight_event * event)84 replicator_disable(device_t dev, struct endpoint *endp,
85 struct coresight_event *event)
86 {
87 struct replicator_softc *sc;
88
89 sc = device_get_softc(dev);
90
91 bus_write_4(sc->res, REPLICATOR_IDFILTER0, 0xff);
92 bus_write_4(sc->res, REPLICATOR_IDFILTER1, 0xff);
93 }
94
95 int
replicator_attach(device_t dev)96 replicator_attach(device_t dev)
97 {
98 struct replicator_softc *sc;
99 struct coresight_desc desc;
100
101 sc = device_get_softc(dev);
102
103 if (bus_alloc_resources(dev, replicator_spec, &sc->res) != 0) {
104 device_printf(dev, "cannot allocate resources for device\n");
105 return (ENXIO);
106 }
107
108 desc.pdata = sc->pdata;
109 desc.dev = dev;
110 desc.dev_type = CORESIGHT_DYNAMIC_REPLICATOR;
111 coresight_register(&desc);
112
113 return (0);
114 }
115
116 static device_method_t replicator_methods[] = {
117 /* Coresight interface */
118 DEVMETHOD(coresight_init, replicator_init),
119 DEVMETHOD(coresight_enable, replicator_enable),
120 DEVMETHOD(coresight_disable, replicator_disable),
121 DEVMETHOD_END
122 };
123
124 DEFINE_CLASS_0(replicator, replicator_driver, replicator_methods,
125 sizeof(struct replicator_softc));
126