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
45static struct resource_spec al_ccu_spec[] = {
46	{ SYS_RES_MEMORY,	0,	RF_ACTIVE },
47	{ -1, 0 }
48};
49
50struct al_ccu_softc {
51	struct resource	*res;
52};
53
54static int al_ccu_probe(device_t dev);
55static int al_ccu_attach(device_t dev);
56static int al_ccu_detach(device_t dev);
57
58static 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
65static driver_t al_ccu_driver = {
66	"ccu",
67	al_ccu_methods,
68	sizeof(struct al_ccu_softc)
69};
70
71EARLY_DRIVER_MODULE(al_ccu, simplebus, al_ccu_driver, 0, 0,
72    BUS_PASS_CPU + BUS_PASS_ORDER_MIDDLE);
73EARLY_DRIVER_MODULE(al_ccu, ofwbus, al_ccu_driver, 0, 0,
74    BUS_PASS_CPU + BUS_PASS_ORDER_MIDDLE);
75
76static int
77al_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
91static int
92al_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
115static int
116al_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