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