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
58 struct tcon_softc {
59 struct resource *res[1];
60 bus_space_tag_t bst;
61 bus_space_handle_t bsh;
62 };
63
64 struct tcon_softc *tcon_sc;
65
66 static struct resource_spec tcon_spec[] = {
67 { SYS_RES_MEMORY, 0, RF_ACTIVE },
68 { -1, 0 }
69 };
70
71 uint32_t
tcon_bypass(void)72 tcon_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
83 static int
tcon_probe(device_t dev)84 tcon_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
97 static int
tcon_attach(device_t dev)98 tcon_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
118 static device_method_t tcon_methods[] = {
119 DEVMETHOD(device_probe, tcon_probe),
120 DEVMETHOD(device_attach, tcon_attach),
121 { 0, 0 }
122 };
123
124 static driver_t tcon_driver = {
125 "tcon",
126 tcon_methods,
127 sizeof(struct tcon_softc),
128 };
129
130 DRIVER_MODULE(tcon, simplebus, tcon_driver, 0, 0);
131