imx6_audmux.c revision 283500 
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__FBSDID("$FreeBSD: stable/10/sys/arm/freescale/imx/imx6_audmux.c 283500 2015-05-24 18:59:45Z ian $");
35
36#include <sys/param.h>
37#include <sys/systm.h>
38#include <sys/bus.h>
39#include <sys/kernel.h>
40#include <sys/module.h>
41#include <sys/malloc.h>
42#include <sys/endian.h>
43#include <sys/rman.h>
44#include <sys/timeet.h>
45#include <sys/timetc.h>
46
47#include <dev/fdt/fdt_common.h>
48#include <dev/ofw/openfirm.h>
49#include <dev/ofw/ofw_bus.h>
50#include <dev/ofw/ofw_bus_subr.h>
51
52#include <machine/bus.h>
53#include <machine/fdt.h>
54#include <machine/cpu.h>
55#include <machine/intr.h>
56
57#define	READ4(_sc, _reg)	\
58	bus_space_read_4(_sc->bst, _sc->bsh, _reg)
59#define	WRITE4(_sc, _reg, _val)	\
60	bus_space_write_4(_sc->bst, _sc->bsh, _reg, _val)
61
62#define	AUDMUX_PTCR(n)	(0x8 * (n - 1))	/* Port Timing Control Register */
63#define	 PTCR_TFS_DIR	(1 << 31)	/* Transmit Frame Sync Direction Control */
64#define	 PTCR_TFSEL_S	27		/* Transmit Frame Sync Select */
65#define	 PTCR_TFSEL_M	0xf
66#define	 PTCR_TCLKDIR	(1 << 26)	/* Transmit Clock Direction Control */
67#define	 PTCR_TCSEL_S	22		/* Transmit Clock Select. */
68#define	 PTCR_TCSEL_M	0xf
69#define	 PTCR_RFS_DIR	(1 << 21)	/* Receive Frame Sync Direction Control */
70#define	 PTCR_SYN	(1 << 11)
71#define	AUDMUX_PDCR(n)	(0x8 * (n - 1) + 0x4)	/* Port Data Control Reg */
72#define	 PDCR_RXDSEL_S		13	/* Receive Data Select */
73#define	 PDCR_RXDSEL_M		0x3
74#define	 PDCR_RXDSEL_PORT(n)	(n - 1)
75
76struct audmux_softc {
77	struct resource		*res[1];
78	bus_space_tag_t		bst;
79	bus_space_handle_t	bsh;
80	void			*ih;
81};
82
83static struct resource_spec audmux_spec[] = {
84	{ SYS_RES_MEMORY,	0,	RF_ACTIVE },
85	{ -1, 0 }
86};
87
88static int
89audmux_probe(device_t dev)
90{
91
92	if (!ofw_bus_status_okay(dev))
93		return (ENXIO);
94
95	if (!ofw_bus_is_compatible(dev, "fsl,imx6q-audmux"))
96		return (ENXIO);
97
98	device_set_desc(dev, "i.MX6 Digital Audio Multiplexer");
99	return (BUS_PROBE_DEFAULT);
100}
101
102static int
103audmux_configure(struct audmux_softc *sc,
104	int ssi_port, int audmux_port)
105{
106	uint32_t reg;
107
108	/* Direction: output */
109	reg = (PTCR_TFS_DIR | PTCR_TCLKDIR | PTCR_SYN);
110	WRITE4(sc, AUDMUX_PTCR(audmux_port), reg);
111
112	/* Select source */
113	reg = (PDCR_RXDSEL_PORT(ssi_port) << PDCR_RXDSEL_S);
114	WRITE4(sc, AUDMUX_PDCR(audmux_port), reg);
115
116	return (0);
117}
118
119static int
120audmux_attach(device_t dev)
121{
122	struct audmux_softc *sc;
123
124	sc = device_get_softc(dev);
125
126	if (bus_alloc_resources(dev, audmux_spec, sc->res)) {
127		device_printf(dev, "could not allocate resources\n");
128		return (ENXIO);
129	}
130
131	/* Memory interface */
132	sc->bst = rman_get_bustag(sc->res[0]);
133	sc->bsh = rman_get_bushandle(sc->res[0]);
134
135	/*
136	 * Direct SSI1 output to AUDMUX5 pins.
137	 * TODO: dehardcore this.
138	 */
139	audmux_configure(sc, 1, 5);
140
141	return (0);
142};
143
144static device_method_t audmux_methods[] = {
145	/* Device interface */
146	DEVMETHOD(device_probe,		audmux_probe),
147	DEVMETHOD(device_attach,	audmux_attach),
148	{ 0, 0 }
149};
150
151static driver_t audmux_driver = {
152	"audmux",
153	audmux_methods,
154	sizeof(struct audmux_softc),
155};
156
157static devclass_t audmux_devclass;
158
159DRIVER_MODULE(audmux, simplebus, audmux_driver, audmux_devclass, 0, 0);
160