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_funnel.h>
42
43 #include "coresight_if.h"
44
45 #define FUNNEL_DEBUG
46 #undef FUNNEL_DEBUG
47
48 #ifdef FUNNEL_DEBUG
49 #define dprintf(fmt, ...) printf(fmt, ##__VA_ARGS__)
50 #else
51 #define dprintf(fmt, ...)
52 #endif
53
54 static struct resource_spec funnel_spec[] = {
55 { SYS_RES_MEMORY, 0, RF_ACTIVE },
56 { -1, 0 }
57 };
58
59 static int
funnel_init(device_t dev)60 funnel_init(device_t dev)
61 {
62 struct funnel_softc *sc;
63
64 sc = device_get_softc(dev);
65 if (sc->hwtype == HWTYPE_STATIC_FUNNEL)
66 return (0);
67
68 /* Unlock Coresight */
69 bus_write_4(sc->res, CORESIGHT_LAR, CORESIGHT_UNLOCK);
70 dprintf("Device ID: %x\n", bus_read_4(sc->res, FUNNEL_DEVICEID));
71
72 return (0);
73 }
74
75 static int
funnel_enable(device_t dev,struct endpoint * endp,struct coresight_event * event)76 funnel_enable(device_t dev, struct endpoint *endp,
77 struct coresight_event *event)
78 {
79 struct funnel_softc *sc;
80 uint32_t reg;
81
82 sc = device_get_softc(dev);
83 if (sc->hwtype == HWTYPE_STATIC_FUNNEL)
84 return (0);
85
86 reg = bus_read_4(sc->res, FUNNEL_FUNCTL);
87 reg &= ~(FUNCTL_HOLDTIME_MASK);
88 reg |= (7 << FUNCTL_HOLDTIME_SHIFT);
89 reg |= (1 << endp->reg);
90 bus_write_4(sc->res, FUNNEL_FUNCTL, reg);
91
92 return (0);
93 }
94
95 static void
funnel_disable(device_t dev,struct endpoint * endp,struct coresight_event * event)96 funnel_disable(device_t dev, struct endpoint *endp,
97 struct coresight_event *event)
98 {
99 struct funnel_softc *sc;
100 uint32_t reg;
101
102 sc = device_get_softc(dev);
103 if (sc->hwtype == HWTYPE_STATIC_FUNNEL)
104 return;
105
106 reg = bus_read_4(sc->res, FUNNEL_FUNCTL);
107 reg &= ~(1 << endp->reg);
108 bus_write_4(sc->res, FUNNEL_FUNCTL, reg);
109 }
110
111 int
funnel_attach(device_t dev)112 funnel_attach(device_t dev)
113 {
114 struct coresight_desc desc;
115 struct funnel_softc *sc;
116
117 sc = device_get_softc(dev);
118 if (sc->hwtype == HWTYPE_FUNNEL &&
119 bus_alloc_resources(dev, funnel_spec, &sc->res) != 0) {
120 device_printf(dev, "cannot allocate resources for device\n");
121 return (ENXIO);
122 }
123
124 desc.pdata = sc->pdata;
125 desc.dev = dev;
126 desc.dev_type = CORESIGHT_FUNNEL;
127 coresight_register(&desc);
128
129 return (0);
130 }
131
132 static device_method_t funnel_methods[] = {
133 /* Coresight interface */
134 DEVMETHOD(coresight_init, funnel_init),
135 DEVMETHOD(coresight_enable, funnel_enable),
136 DEVMETHOD(coresight_disable, funnel_disable),
137 DEVMETHOD_END
138 };
139
140 DEFINE_CLASS_0(funnel, funnel_driver, funnel_methods,
141 sizeof(struct funnel_softc));
142