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("$FreeBSD$");
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/ofw/openfirm.h>
48#include <dev/ofw/ofw_bus.h>
49#include <dev/ofw/ofw_bus_subr.h>
50
51#include <machine/bus.h>
52#include <machine/cpu.h>
53#include <machine/intr.h>
54
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)
59
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)
73
74struct audmux_softc {
75	struct resource		*res[1];
76	bus_space_tag_t		bst;
77	bus_space_handle_t	bsh;
78	void			*ih;
79};
80
81static struct resource_spec audmux_spec[] = {
82	{ SYS_RES_MEMORY,	0,	RF_ACTIVE },
83	{ -1, 0 }
84};
85
86static int
87audmux_probe(device_t dev)
88{
89
90	if (!ofw_bus_status_okay(dev))
91		return (ENXIO);
92
93	if (!ofw_bus_is_compatible(dev, "fsl,imx6q-audmux"))
94		return (ENXIO);
95
96	device_set_desc(dev, "i.MX6 Digital Audio Multiplexer");
97	return (BUS_PROBE_DEFAULT);
98}
99
100static int
101audmux_configure(struct audmux_softc *sc,
102	int ssi_port, int audmux_port)
103{
104	uint32_t reg;
105
106	/* Direction: output */
107	reg = (PTCR_TFS_DIR | PTCR_TCLKDIR | PTCR_SYN);
108	WRITE4(sc, AUDMUX_PTCR(audmux_port), reg);
109
110	/* Select source */
111	reg = (PDCR_RXDSEL_PORT(ssi_port) << PDCR_RXDSEL_S);
112	WRITE4(sc, AUDMUX_PDCR(audmux_port), reg);
113
114	return (0);
115}
116
117static int
118audmux_attach(device_t dev)
119{
120	struct audmux_softc *sc;
121
122	sc = device_get_softc(dev);
123
124	if (bus_alloc_resources(dev, audmux_spec, sc->res)) {
125		device_printf(dev, "could not allocate resources\n");
126		return (ENXIO);
127	}
128
129	/* Memory interface */
130	sc->bst = rman_get_bustag(sc->res[0]);
131	sc->bsh = rman_get_bushandle(sc->res[0]);
132
133	/*
134	 * Direct SSI1 output to AUDMUX5 pins.
135	 * TODO: dehardcore this.
136	 */
137	audmux_configure(sc, 1, 5);
138
139	return (0);
140};
141
142static device_method_t audmux_methods[] = {
143	/* Device interface */
144	DEVMETHOD(device_probe,		audmux_probe),
145	DEVMETHOD(device_attach,	audmux_attach),
146	{ 0, 0 }
147};
148
149static driver_t audmux_driver = {
150	"audmux",
151	audmux_methods,
152	sizeof(struct audmux_softc),
153};
154
155static devclass_t audmux_devclass;
156
157DRIVER_MODULE(audmux, simplebus, audmux_driver, audmux_devclass, 0, 0);
158