2 * Copyright (c) 2015 Ruslan Bukin <br@bsdpad.com>
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
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
28 * i.MX6 Digital Audio Multiplexer (AUDMUX)
29 * Chapter 16, i.MX 6Dual/6Quad Applications Processor Reference Manual,
33 #include <sys/cdefs.h>
34 __FBSDID("$FreeBSD$");
36 #include <sys/param.h>
37 #include <sys/systm.h>
39 #include <sys/kernel.h>
40 #include <sys/module.h>
41 #include <sys/malloc.h>
42 #include <sys/endian.h>
44 #include <sys/timeet.h>
45 #include <sys/timetc.h>
47 #include <dev/ofw/openfirm.h>
48 #include <dev/ofw/ofw_bus.h>
49 #include <dev/ofw/ofw_bus_subr.h>
51 #include <machine/bus.h>
52 #include <machine/cpu.h>
53 #include <machine/intr.h>
55 #define READ4(_sc, _reg) \
56 bus_space_read_4(_sc->bst, _sc->bsh, _reg)
57 #define WRITE4(_sc, _reg, _val) \
58 bus_space_write_4(_sc->bst, _sc->bsh, _reg, _val)
60 #define AUDMUX_PTCR(n) (0x8 * (n - 1)) /* Port Timing Control Register */
61 #define PTCR_TFS_DIR (1 << 31) /* Transmit Frame Sync Direction Control */
62 #define PTCR_TFSEL_S 27 /* Transmit Frame Sync Select */
63 #define PTCR_TFSEL_M 0xf
64 #define PTCR_TCLKDIR (1 << 26) /* Transmit Clock Direction Control */
65 #define PTCR_TCSEL_S 22 /* Transmit Clock Select. */
66 #define PTCR_TCSEL_M 0xf
67 #define PTCR_RFS_DIR (1 << 21) /* Receive Frame Sync Direction Control */
68 #define PTCR_SYN (1 << 11)
69 #define AUDMUX_PDCR(n) (0x8 * (n - 1) + 0x4) /* Port Data Control Reg */
70 #define PDCR_RXDSEL_S 13 /* Receive Data Select */
71 #define PDCR_RXDSEL_M 0x3
72 #define PDCR_RXDSEL_PORT(n) (n - 1)
75 struct resource *res[1];
77 bus_space_handle_t bsh;
81 static struct resource_spec audmux_spec[] = {
82 { SYS_RES_MEMORY, 0, RF_ACTIVE },
87 audmux_probe(device_t dev)
90 if (!ofw_bus_status_okay(dev))
93 if (!ofw_bus_is_compatible(dev, "fsl,imx6q-audmux"))
96 device_set_desc(dev, "i.MX6 Digital Audio Multiplexer");
97 return (BUS_PROBE_DEFAULT);
101 audmux_configure(struct audmux_softc *sc,
102 int ssi_port, int audmux_port)
106 /* Direction: output */
107 reg = (PTCR_TFS_DIR | PTCR_TCLKDIR | PTCR_SYN);
108 WRITE4(sc, AUDMUX_PTCR(audmux_port), reg);
111 reg = (PDCR_RXDSEL_PORT(ssi_port) << PDCR_RXDSEL_S);
112 WRITE4(sc, AUDMUX_PDCR(audmux_port), reg);
118 audmux_attach(device_t dev)
120 struct audmux_softc *sc;
122 sc = device_get_softc(dev);
124 if (bus_alloc_resources(dev, audmux_spec, sc->res)) {
125 device_printf(dev, "could not allocate resources\n");
129 /* Memory interface */
130 sc->bst = rman_get_bustag(sc->res[0]);
131 sc->bsh = rman_get_bushandle(sc->res[0]);
134 * Direct SSI1 output to AUDMUX5 pins.
135 * TODO: dehardcore this.
137 audmux_configure(sc, 1, 5);
142 static device_method_t audmux_methods[] = {
143 /* Device interface */
144 DEVMETHOD(device_probe, audmux_probe),
145 DEVMETHOD(device_attach, audmux_attach),
149 static driver_t audmux_driver = {
152 sizeof(struct audmux_softc),
155 static devclass_t audmux_devclass;
157 DRIVER_MODULE(audmux, simplebus, audmux_driver, audmux_devclass, 0, 0);