1/*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (c) 2014 Ruslan Bukin <br@bsdpad.com>
5 * All rights reserved.
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/*
30 * Vybrid Family Timing Controller (TCON)
31 * Chapter 58, Vybrid Reference Manual, Rev. 5, 07/2013
32 */
33
34#include <sys/cdefs.h>
35__FBSDID("$FreeBSD$");
36
37#include <sys/param.h>
38#include <sys/systm.h>
39#include <sys/bus.h>
40#include <sys/kernel.h>
41#include <sys/module.h>
42#include <sys/malloc.h>
43#include <sys/rman.h>
44#include <sys/timeet.h>
45#include <sys/timetc.h>
46#include <sys/watchdog.h>
47
48#include <dev/ofw/openfirm.h>
49#include <dev/ofw/ofw_bus.h>
50#include <dev/ofw/ofw_bus_subr.h>
51
52#include <machine/bus.h>
53#include <machine/cpu.h>
54#include <machine/intr.h>
55
56#include <arm/freescale/vybrid/vf_common.h>
57
58#define	TCON0_CTRL1	0x00
59#define	TCON_BYPASS	(1 << 29)
60
61struct tcon_softc {
62	struct resource		*res[1];
63	bus_space_tag_t		bst;
64	bus_space_handle_t	bsh;
65};
66
67struct tcon_softc *tcon_sc;
68
69static struct resource_spec tcon_spec[] = {
70	{ SYS_RES_MEMORY,	0,	RF_ACTIVE },
71	{ -1, 0 }
72};
73
74uint32_t
75tcon_bypass(void)
76{
77	struct tcon_softc *sc;
78
79	if (tcon_sc == NULL)
80		return (1);
81
82	sc = tcon_sc;
83
84	WRITE4(tcon_sc, TCON0_CTRL1, TCON_BYPASS);
85
86	return (0);
87}
88
89static int
90tcon_probe(device_t dev)
91{
92
93	if (!ofw_bus_status_okay(dev))
94		return (ENXIO);
95
96	if (!ofw_bus_is_compatible(dev, "fsl,mvf600-tcon"))
97		return (ENXIO);
98
99	device_set_desc(dev, "Vybrid Family Timing Controller (TCON)");
100	return (BUS_PROBE_DEFAULT);
101}
102
103static int
104tcon_attach(device_t dev)
105{
106	struct tcon_softc *sc;
107
108	sc = device_get_softc(dev);
109
110	if (bus_alloc_resources(dev, tcon_spec, sc->res)) {
111		device_printf(dev, "could not allocate resources\n");
112		return (ENXIO);
113	}
114
115	/* Memory interface */
116	sc->bst = rman_get_bustag(sc->res[0]);
117	sc->bsh = rman_get_bushandle(sc->res[0]);
118
119	tcon_sc = sc;
120
121	return (0);
122}
123
124static device_method_t tcon_methods[] = {
125	DEVMETHOD(device_probe,		tcon_probe),
126	DEVMETHOD(device_attach,	tcon_attach),
127	{ 0, 0 }
128};
129
130static driver_t tcon_driver = {
131	"tcon",
132	tcon_methods,
133	sizeof(struct tcon_softc),
134};
135
136static devclass_t tcon_devclass;
137
138DRIVER_MODULE(tcon, simplebus, tcon_driver, tcon_devclass, 0, 0);
139