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/param.h>
30 #include <sys/bus.h>
31 #include <sys/conf.h>
32 #include <sys/rman.h>
33 #include <sys/kernel.h>
34 #include <sys/module.h>
35 #include <sys/resource.h>
36 #include <sys/systm.h>
37
38 #include <machine/bus.h>
39 #include <dev/ofw/ofw_bus_subr.h>
40
41 #define AL_CCU_SNOOP_CONTROL_IOFAB_0_OFFSET 0x4000
42 #define AL_CCU_SNOOP_CONTROL_IOFAB_1_OFFSET 0x5000
43 #define AL_CCU_SPECULATION_CONTROL_OFFSET 0x4
44
45 static struct resource_spec al_ccu_spec[] = {
46 { SYS_RES_MEMORY, 0, RF_ACTIVE },
47 { -1, 0 }
48 };
49
50 struct al_ccu_softc {
51 struct resource *res;
52 };
53
54 static int al_ccu_probe(device_t dev);
55 static int al_ccu_attach(device_t dev);
56 static int al_ccu_detach(device_t dev);
57
58 static device_method_t al_ccu_methods[] = {
59 DEVMETHOD(device_probe, al_ccu_probe),
60 DEVMETHOD(device_attach, al_ccu_attach),
61 DEVMETHOD(device_detach, al_ccu_detach),
62 { 0, 0 }
63 };
64
65 static driver_t al_ccu_driver = {
66 "ccu",
67 al_ccu_methods,
68 sizeof(struct al_ccu_softc)
69 };
70
71 EARLY_DRIVER_MODULE(al_ccu, simplebus, al_ccu_driver, 0, 0,
72 BUS_PASS_CPU + BUS_PASS_ORDER_MIDDLE);
73 EARLY_DRIVER_MODULE(al_ccu, ofwbus, al_ccu_driver, 0, 0,
74 BUS_PASS_CPU + BUS_PASS_ORDER_MIDDLE);
75
76 static int
al_ccu_probe(device_t dev)77 al_ccu_probe(device_t dev)
78 {
79
80 if (!ofw_bus_status_okay(dev))
81 return (ENXIO);
82
83 if (!ofw_bus_is_compatible(dev, "annapurna-labs,al-ccu"))
84 return (ENXIO);
85
86 device_set_desc(dev, "Alpine CCU");
87
88 return (BUS_PROBE_DEFAULT);
89 }
90
91 static int
al_ccu_attach(device_t dev)92 al_ccu_attach(device_t dev)
93 {
94 struct al_ccu_softc *sc;
95 int err;
96
97 sc = device_get_softc(dev);
98
99 err = bus_alloc_resources(dev, al_ccu_spec, &sc->res);
100 if (err != 0) {
101 device_printf(dev, "could not allocate resources\n");
102 return (err);
103 }
104
105 /* Enable cache snoop */
106 bus_write_4(sc->res, AL_CCU_SNOOP_CONTROL_IOFAB_0_OFFSET, 1);
107 bus_write_4(sc->res, AL_CCU_SNOOP_CONTROL_IOFAB_1_OFFSET, 1);
108
109 /* Disable speculative fetches from masters */
110 bus_write_4(sc->res, AL_CCU_SPECULATION_CONTROL_OFFSET, 7);
111
112 return (0);
113 }
114
115 static int
al_ccu_detach(device_t dev)116 al_ccu_detach(device_t dev)
117 {
118 struct al_ccu_softc *sc;
119
120 sc = device_get_softc(dev);
121
122 bus_release_resources(dev, al_ccu_spec, &sc->res);
123
124 return (0);
125 }
126