1 /*-
2 * Copyright (c) 2015 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 * i.MX6 Digital Audio Multiplexer (AUDMUX)
29 * Chapter 16, i.MX 6Dual/6Quad Applications Processor Reference Manual,
30 * Rev. 1, 04/2013
31 */
32
33 #include <sys/cdefs.h>
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/endian.h>
41 #include <sys/rman.h>
42 #include <sys/timeet.h>
43 #include <sys/timetc.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 #define READ4(_sc, _reg) \
54 bus_space_read_4(_sc->bst, _sc->bsh, _reg)
55 #define WRITE4(_sc, _reg, _val) \
56 bus_space_write_4(_sc->bst, _sc->bsh, _reg, _val)
57
58 #define AUDMUX_PTCR(n) (0x8 * (n - 1)) /* Port Timing Control Register */
59 #define PTCR_TFS_DIR (1 << 31) /* Transmit Frame Sync Direction Control */
60 #define PTCR_TFSEL_S 27 /* Transmit Frame Sync Select */
61 #define PTCR_TFSEL_M 0xf
62 #define PTCR_TCLKDIR (1 << 26) /* Transmit Clock Direction Control */
63 #define PTCR_TCSEL_S 22 /* Transmit Clock Select. */
64 #define PTCR_TCSEL_M 0xf
65 #define PTCR_RFS_DIR (1 << 21) /* Receive Frame Sync Direction Control */
66 #define PTCR_SYN (1 << 11)
67 #define AUDMUX_PDCR(n) (0x8 * (n - 1) + 0x4) /* Port Data Control Reg */
68 #define PDCR_RXDSEL_S 13 /* Receive Data Select */
69 #define PDCR_RXDSEL_M 0x3
70 #define PDCR_RXDSEL_PORT(n) (n - 1)
71
72 struct audmux_softc {
73 struct resource *res[1];
74 bus_space_tag_t bst;
75 bus_space_handle_t bsh;
76 void *ih;
77 };
78
79 static struct resource_spec audmux_spec[] = {
80 { SYS_RES_MEMORY, 0, RF_ACTIVE },
81 { -1, 0 }
82 };
83
84 static int
audmux_probe(device_t dev)85 audmux_probe(device_t dev)
86 {
87
88 if (!ofw_bus_status_okay(dev))
89 return (ENXIO);
90
91 if (!ofw_bus_is_compatible(dev, "fsl,imx6q-audmux"))
92 return (ENXIO);
93
94 device_set_desc(dev, "i.MX6 Digital Audio Multiplexer");
95 return (BUS_PROBE_DEFAULT);
96 }
97
98 static int
audmux_configure(struct audmux_softc * sc,int ssi_port,int audmux_port)99 audmux_configure(struct audmux_softc *sc,
100 int ssi_port, int audmux_port)
101 {
102 uint32_t reg;
103
104 /* Direction: output */
105 reg = (PTCR_TFS_DIR | PTCR_TCLKDIR | PTCR_SYN);
106 WRITE4(sc, AUDMUX_PTCR(audmux_port), reg);
107
108 /* Select source */
109 reg = (PDCR_RXDSEL_PORT(ssi_port) << PDCR_RXDSEL_S);
110 WRITE4(sc, AUDMUX_PDCR(audmux_port), reg);
111
112 return (0);
113 }
114
115 static int
audmux_attach(device_t dev)116 audmux_attach(device_t dev)
117 {
118 struct audmux_softc *sc;
119
120 sc = device_get_softc(dev);
121
122 if (bus_alloc_resources(dev, audmux_spec, sc->res)) {
123 device_printf(dev, "could not allocate resources\n");
124 return (ENXIO);
125 }
126
127 /* Memory interface */
128 sc->bst = rman_get_bustag(sc->res[0]);
129 sc->bsh = rman_get_bushandle(sc->res[0]);
130
131 /*
132 * Direct SSI1 output to AUDMUX5 pins.
133 * TODO: dehardcore this.
134 */
135 audmux_configure(sc, 1, 5);
136
137 return (0);
138 };
139
140 static device_method_t audmux_methods[] = {
141 /* Device interface */
142 DEVMETHOD(device_probe, audmux_probe),
143 DEVMETHOD(device_attach, audmux_attach),
144 { 0, 0 }
145 };
146
147 static driver_t audmux_driver = {
148 "audmux",
149 audmux_methods,
150 sizeof(struct audmux_softc),
151 };
152
153 DRIVER_MODULE(audmux, simplebus, audmux_driver, 0, 0);
154