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/param.h>
34 #include <sys/systm.h>
35 #include <sys/bus.h>
36 #include <sys/kernel.h>
37 #include <sys/module.h>
38 #include <sys/malloc.h>
39 #include <sys/endian.h>
40 #include <sys/rman.h>
41 #include <sys/timeet.h>
42 #include <sys/timetc.h>
43
44 #include <dev/ofw/openfirm.h>
45 #include <dev/ofw/ofw_bus.h>
46 #include <dev/ofw/ofw_bus_subr.h>
47
48 #include <machine/bus.h>
49 #include <machine/cpu.h>
50 #include <machine/intr.h>
51
52 #define READ4(_sc, _reg) \
53 bus_space_read_4(_sc->bst, _sc->bsh, _reg)
54 #define WRITE4(_sc, _reg, _val) \
55 bus_space_write_4(_sc->bst, _sc->bsh, _reg, _val)
56
57 #define AUDMUX_PTCR(n) (0x8 * (n - 1)) /* Port Timing Control Register */
58 #define PTCR_TFS_DIR (1 << 31) /* Transmit Frame Sync Direction Control */
59 #define PTCR_TFSEL_S 27 /* Transmit Frame Sync Select */
60 #define PTCR_TFSEL_M 0xf
61 #define PTCR_TCLKDIR (1 << 26) /* Transmit Clock Direction Control */
62 #define PTCR_TCSEL_S 22 /* Transmit Clock Select. */
63 #define PTCR_TCSEL_M 0xf
64 #define PTCR_RFS_DIR (1 << 21) /* Receive Frame Sync Direction Control */
65 #define PTCR_SYN (1 << 11)
66 #define AUDMUX_PDCR(n) (0x8 * (n - 1) + 0x4) /* Port Data Control Reg */
67 #define PDCR_RXDSEL_S 13 /* Receive Data Select */
68 #define PDCR_RXDSEL_M 0x3
69 #define PDCR_RXDSEL_PORT(n) (n - 1)
70
71 struct audmux_softc {
72 struct resource *res[1];
73 bus_space_tag_t bst;
74 bus_space_handle_t bsh;
75 void *ih;
76 };
77
78 static struct resource_spec audmux_spec[] = {
79 { SYS_RES_MEMORY, 0, RF_ACTIVE },
80 { -1, 0 }
81 };
82
83 static int
audmux_probe(device_t dev)84 audmux_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,imx6q-audmux"))
91 return (ENXIO);
92
93 device_set_desc(dev, "i.MX6 Digital Audio Multiplexer");
94 return (BUS_PROBE_DEFAULT);
95 }
96
97 static int
audmux_configure(struct audmux_softc * sc,int ssi_port,int audmux_port)98 audmux_configure(struct audmux_softc *sc,
99 int ssi_port, int audmux_port)
100 {
101 uint32_t reg;
102
103 /* Direction: output */
104 reg = (PTCR_TFS_DIR | PTCR_TCLKDIR | PTCR_SYN);
105 WRITE4(sc, AUDMUX_PTCR(audmux_port), reg);
106
107 /* Select source */
108 reg = (PDCR_RXDSEL_PORT(ssi_port) << PDCR_RXDSEL_S);
109 WRITE4(sc, AUDMUX_PDCR(audmux_port), reg);
110
111 return (0);
112 }
113
114 static int
audmux_attach(device_t dev)115 audmux_attach(device_t dev)
116 {
117 struct audmux_softc *sc;
118
119 sc = device_get_softc(dev);
120
121 if (bus_alloc_resources(dev, audmux_spec, sc->res)) {
122 device_printf(dev, "could not allocate resources\n");
123 return (ENXIO);
124 }
125
126 /* Memory interface */
127 sc->bst = rman_get_bustag(sc->res[0]);
128 sc->bsh = rman_get_bushandle(sc->res[0]);
129
130 /*
131 * Direct SSI1 output to AUDMUX5 pins.
132 * TODO: dehardcore this.
133 */
134 audmux_configure(sc, 1, 5);
135
136 return (0);
137 };
138
139 static device_method_t audmux_methods[] = {
140 /* Device interface */
141 DEVMETHOD(device_probe, audmux_probe),
142 DEVMETHOD(device_attach, audmux_attach),
143 { 0, 0 }
144 };
145
146 static driver_t audmux_driver = {
147 "audmux",
148 audmux_methods,
149 sizeof(struct audmux_softc),
150 };
151
152 DRIVER_MODULE(audmux, simplebus, audmux_driver, 0, 0);
153