1 /*-
2 * Copyright (c) 2014 Ruslan Bukin <br@bsdpad.com>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27 /*
28 * Vybrid Family Timing Controller (TCON)
29 * Chapter 58, Vybrid Reference Manual, Rev. 5, 07/2013
30 */
31
32 #include <sys/cdefs.h>
33 __FBSDID("$FreeBSD: releng/10.2/sys/arm/freescale/vybrid/vf_tcon.c 266155 2014-05-15 16:23:24Z ian $");
34
35 #include <sys/param.h>
36 #include <sys/systm.h>
37 #include <sys/bus.h>
38 #include <sys/kernel.h>
39 #include <sys/module.h>
40 #include <sys/malloc.h>
41 #include <sys/rman.h>
42 #include <sys/timeet.h>
43 #include <sys/timetc.h>
44 #include <sys/watchdog.h>
45
46 #include <dev/fdt/fdt_common.h>
47 #include <dev/ofw/openfirm.h>
48 #include <dev/ofw/ofw_bus.h>
49 #include <dev/ofw/ofw_bus_subr.h>
50
51 #include <machine/bus.h>
52 #include <machine/fdt.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
61 struct tcon_softc {
62 struct resource *res[1];
63 bus_space_tag_t bst;
64 bus_space_handle_t bsh;
65 };
66
67 struct tcon_softc *tcon_sc;
68
69 static struct resource_spec tcon_spec[] = {
70 { SYS_RES_MEMORY, 0, RF_ACTIVE },
71 { -1, 0 }
72 };
73
74 uint32_t
75 tcon_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
89 static int
90 tcon_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
103 static int
104 tcon_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
124 static device_method_t tcon_methods[] = {
125 DEVMETHOD(device_probe, tcon_probe),
126 DEVMETHOD(device_attach, tcon_attach),
127 { 0, 0 }
128 };
129
130 static driver_t tcon_driver = {
131 "tcon",
132 tcon_methods,
133 sizeof(struct tcon_softc),
134 };
135
136 static devclass_t tcon_devclass;
137
138 DRIVER_MODULE(tcon, simplebus, tcon_driver, tcon_devclass, 0, 0);
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