xref: /freebsd/sys/arm/freescale/imx/imx6_audmux.c (revision 4b9d6057)
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
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
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
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