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1 /*-
2  * Copyright (c) 2015,2016 Annapurna Labs Ltd. and affiliates
3  * All rights reserved.
4  *
5  * Developed by Semihalf.
6  *
7  * Redistribution and use in source and binary forms, with or without
8  * modification, are permitted provided that the following conditions
9  * are met:
10  * 1. Redistributions of source code must retain the above copyright
11  *    notice, this list of conditions and the following disclaimer.
12  * 2. Redistributions in binary form must reproduce the above copyright
13  *    notice, this list of conditions and the following disclaimer in the
14  *    documentation and/or other materials provided with the distribution.
15  *
16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19  * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26  * SUCH DAMAGE.
27  */
28
29 #include <sys/cdefs.h>
30 __FBSDID("$FreeBSD$");
31
32 #include <sys/param.h>
33 #include <sys/bus.h>
34 #include <sys/conf.h>
35 #include <sys/rman.h>
36 #include <sys/kernel.h>
37 #include <sys/module.h>
38 #include <sys/resource.h>
39 #include <sys/systm.h>
40
41 #include <machine/bus.h>
42 #include <dev/ofw/ofw_bus_subr.h>
43
44 #define AL_CCU_SNOOP_CONTROL_IOFAB_0_OFFSET     0x4000
45 #define AL_CCU_SNOOP_CONTROL_IOFAB_1_OFFSET     0x5000
46 #define AL_CCU_SPECULATION_CONTROL_OFFSET       0x4
47
48 static struct resource_spec al_ccu_spec[] = {
49         { SYS_RES_MEMORY,       0,      RF_ACTIVE },
50         { -1, 0 }
51 };
52
53 struct al_ccu_softc {
54         struct resource *res;
55 };
56
57 static int al_ccu_probe(device_t dev);
58 static int al_ccu_attach(device_t dev);
59 static int al_ccu_detach(device_t dev);
60
61 static device_method_t al_ccu_methods[] = {
62         DEVMETHOD(device_probe,         al_ccu_probe),
63         DEVMETHOD(device_attach,        al_ccu_attach),
64         DEVMETHOD(device_detach,        al_ccu_detach),
65         { 0, 0 }
66 };
67
68 static driver_t al_ccu_driver = {
69         "ccu",
70         al_ccu_methods,
71         sizeof(struct al_ccu_softc)
72 };
73
74 EARLY_DRIVER_MODULE(al_ccu, simplebus, al_ccu_driver, 0, 0,
75     BUS_PASS_CPU + BUS_PASS_ORDER_MIDDLE);
76 EARLY_DRIVER_MODULE(al_ccu, ofwbus, al_ccu_driver, 0, 0,
77     BUS_PASS_CPU + BUS_PASS_ORDER_MIDDLE);
78
79 static int
80 al_ccu_probe(device_t dev)
81 {
82
83         if (!ofw_bus_status_okay(dev))
84                 return (ENXIO);
85
86         if (!ofw_bus_is_compatible(dev, "annapurna-labs,al-ccu"))
87                 return (ENXIO);
88
89         device_set_desc(dev, "Alpine CCU");
90
91         return (BUS_PROBE_DEFAULT);
92 }
93
94 static int
95 al_ccu_attach(device_t dev)
96 {
97         struct al_ccu_softc *sc;
98         int err;
99
100         sc = device_get_softc(dev);
101
102         err = bus_alloc_resources(dev, al_ccu_spec, &sc->res);
103         if (err != 0) {
104                 device_printf(dev, "could not allocate resources\n");
105                 return (err);
106         }
107
108         /* Enable cache snoop */
109         bus_write_4(sc->res, AL_CCU_SNOOP_CONTROL_IOFAB_0_OFFSET, 1);
110         bus_write_4(sc->res, AL_CCU_SNOOP_CONTROL_IOFAB_1_OFFSET, 1);
111
112         /* Disable speculative fetches from masters */
113         bus_write_4(sc->res, AL_CCU_SPECULATION_CONTROL_OFFSET, 7);
114
115         return (0);
116 }
117
118 static int
119 al_ccu_detach(device_t dev)
120 {
121         struct al_ccu_softc *sc;
122
123         sc = device_get_softc(dev);
124
125         bus_release_resources(dev, al_ccu_spec, &sc->res);
126
127         return (0);
128 }