vf_dmamux.c revision 266170 
1/*-
2 * Copyright (c) 2014 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 * Vybrid Family Direct Memory Access Multiplexer (DMAMUX)
29 * Chapter 22, Vybrid Reference Manual, Rev. 5, 07/2013
30 */
31
32#include <sys/cdefs.h>
33__FBSDID("$FreeBSD: stable/10/sys/arm/freescale/vybrid/vf_dmamux.c 266170 2014-05-15 18:38:19Z ian $");
34
35#include <sys/param.h>
36#include <sys/systm.h>
37#include <sys/bus.h>
38#include <sys/kernel.h>
39#include <sys/module.h>
40#include <sys/malloc.h>
41#include <sys/rman.h>
42#include <sys/timeet.h>
43#include <sys/timetc.h>
44#include <sys/watchdog.h>
45
46#include <dev/fdt/fdt_common.h>
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/fdt.h>
53#include <machine/cpu.h>
54#include <machine/intr.h>
55
56#include <arm/freescale/vybrid/vf_common.h>
57#include <arm/freescale/vybrid/vf_dmamux.h>
58
59#define	DMAMUX_CHCFG(n)		(0x1 * n)	/* Channels 0-15 Cfg Reg */
60#define	CHCFG_ENBL		(1 << 7)	/* Channel Enable */
61#define	CHCFG_TRIG		(1 << 6)	/* Channel Trigger Enable */
62#define	CHCFG_SOURCE_MASK	0x3f		/* Channel Source (Slot) */
63#define	CHCFG_SOURCE_SHIFT	0
64
65struct dmamux_softc {
66	struct resource		*res[4];
67	bus_space_tag_t		bst[4];
68	bus_space_handle_t	bsh[4];
69};
70
71struct dmamux_softc *dmamux_sc;
72
73static struct resource_spec dmamux_spec[] = {
74	{ SYS_RES_MEMORY,	0,	RF_ACTIVE }, /* DMAMUX0 */
75	{ SYS_RES_MEMORY,	1,	RF_ACTIVE }, /* DMAMUX1 */
76	{ SYS_RES_MEMORY,	2,	RF_ACTIVE }, /* DMAMUX2 */
77	{ SYS_RES_MEMORY,	3,	RF_ACTIVE }, /* DMAMUX3 */
78	{ -1, 0 }
79};
80
81static int
82dmamux_probe(device_t dev)
83{
84
85	if (!ofw_bus_status_okay(dev))
86		return (ENXIO);
87
88	if (!ofw_bus_is_compatible(dev, "fsl,mvf600-dmamux"))
89		return (ENXIO);
90
91	device_set_desc(dev, "Vybrid Family Direct Memory Access Multiplexer");
92	return (BUS_PROBE_DEFAULT);
93}
94
95int
96dmamux_configure(int mux, int source, int channel, int enable)
97{
98	struct dmamux_softc *sc;
99	int reg;
100
101	sc = dmamux_sc;
102
103	MUX_WRITE1(sc, mux, DMAMUX_CHCFG(channel), 0x0);
104
105	reg = 0;
106	if (enable)
107		reg |= (CHCFG_ENBL);
108
109	reg &= ~(CHCFG_SOURCE_MASK << CHCFG_SOURCE_SHIFT);
110	reg |= (source << CHCFG_SOURCE_SHIFT);
111
112	MUX_WRITE1(sc, mux, DMAMUX_CHCFG(channel), reg);
113
114	return (0);
115}
116
117static int
118dmamux_attach(device_t dev)
119{
120	struct dmamux_softc *sc;
121	int i;
122
123	sc = device_get_softc(dev);
124
125	if (bus_alloc_resources(dev, dmamux_spec, sc->res)) {
126		device_printf(dev, "could not allocate resources\n");
127		return (ENXIO);
128	}
129
130	/* Memory interface */
131	for (i = 0; i < 4; i++) {
132		sc->bst[i] = rman_get_bustag(sc->res[i]);
133		sc->bsh[i] = rman_get_bushandle(sc->res[i]);
134	}
135
136	dmamux_sc = sc;
137
138	return (0);
139}
140
141static device_method_t dmamux_methods[] = {
142	DEVMETHOD(device_probe,		dmamux_probe),
143	DEVMETHOD(device_attach,	dmamux_attach),
144	{ 0, 0 }
145};
146
147static driver_t dmamux_driver = {
148	"dmamux",
149	dmamux_methods,
150	sizeof(struct dmamux_softc),
151};
152
153static devclass_t dmamux_devclass;
154
155DRIVER_MODULE(dmamux, simplebus, dmamux_driver, dmamux_devclass, 0, 0);
156