2 * Copyright (c) 2015,2016 Annapurna Labs Ltd. and affiliates
5 * Developed by Semihalf.
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
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.
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
29 #include <sys/cdefs.h>
30 __FBSDID("$FreeBSD$");
32 #include <sys/param.h>
36 #include <sys/kernel.h>
37 #include <sys/module.h>
38 #include <sys/resource.h>
39 #include <sys/systm.h>
41 #include <machine/bus.h>
42 #include <dev/ofw/ofw_bus_subr.h>
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
48 static struct resource_spec al_ccu_spec[] = {
49 { SYS_RES_MEMORY, 0, RF_ACTIVE },
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);
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),
68 static driver_t al_ccu_driver = {
71 sizeof(struct al_ccu_softc)
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);
80 al_ccu_probe(device_t dev)
83 if (!ofw_bus_status_okay(dev))
86 if (!ofw_bus_is_compatible(dev, "annapurna-labs,al-ccu"))
89 device_set_desc(dev, "Alpine CCU");
91 return (BUS_PROBE_DEFAULT);
95 al_ccu_attach(device_t dev)
97 struct al_ccu_softc *sc;
100 sc = device_get_softc(dev);
102 err = bus_alloc_resources(dev, al_ccu_spec, &sc->res);
104 device_printf(dev, "could not allocate resources\n");
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);
112 /* Disable speculative fetches from masters */
113 bus_write_4(sc->res, AL_CCU_SPECULATION_CONTROL_OFFSET, 7);
119 al_ccu_detach(device_t dev)
121 struct al_ccu_softc *sc;
123 sc = device_get_softc(dev);
125 bus_release_resources(dev, al_ccu_spec, &sc->res);