vf_dmamux.c revision 331722 
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/11/sys/arm/freescale/vybrid/vf_dmamux.c 331722 2018-03-29 02:50:57Z eadler $");
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/cpu.h>
53#include <machine/intr.h>
54
55#include <arm/freescale/vybrid/vf_common.h>
56#include <arm/freescale/vybrid/vf_dmamux.h>
57
58#define	DMAMUX_CHCFG(n)		(0x1 * n)	/* Channels 0-15 Cfg Reg */
59#define	CHCFG_ENBL		(1 << 7)	/* Channel Enable */
60#define	CHCFG_TRIG		(1 << 6)	/* Channel Trigger Enable */
61#define	CHCFG_SOURCE_MASK	0x3f		/* Channel Source (Slot) */
62#define	CHCFG_SOURCE_SHIFT	0
63
64struct dmamux_softc {
65	struct resource		*res[4];
66	bus_space_tag_t		bst[4];
67	bus_space_handle_t	bsh[4];
68};
69
70struct dmamux_softc *dmamux_sc;
71
72static struct resource_spec dmamux_spec[] = {
73	{ SYS_RES_MEMORY,	0,	RF_ACTIVE }, /* DMAMUX0 */
74	{ SYS_RES_MEMORY,	1,	RF_ACTIVE }, /* DMAMUX1 */
75	{ SYS_RES_MEMORY,	2,	RF_ACTIVE }, /* DMAMUX2 */
76	{ SYS_RES_MEMORY,	3,	RF_ACTIVE }, /* DMAMUX3 */
77	{ -1, 0 }
78};
79
80static int
81dmamux_probe(device_t dev)
82{
83
84	if (!ofw_bus_status_okay(dev))
85		return (ENXIO);
86
87	if (!ofw_bus_is_compatible(dev, "fsl,mvf600-dmamux"))
88		return (ENXIO);
89
90	device_set_desc(dev, "Vybrid Family Direct Memory Access Multiplexer");
91	return (BUS_PROBE_DEFAULT);
92}
93
94int
95dmamux_configure(int mux, int source, int channel, int enable)
96{
97	struct dmamux_softc *sc;
98	int reg;
99
100	sc = dmamux_sc;
101
102	MUX_WRITE1(sc, mux, DMAMUX_CHCFG(channel), 0x0);
103
104	reg = 0;
105	if (enable)
106		reg |= (CHCFG_ENBL);
107
108	reg &= ~(CHCFG_SOURCE_MASK << CHCFG_SOURCE_SHIFT);
109	reg |= (source << CHCFG_SOURCE_SHIFT);
110
111	MUX_WRITE1(sc, mux, DMAMUX_CHCFG(channel), reg);
112
113	return (0);
114}
115
116static int
117dmamux_attach(device_t dev)
118{
119	struct dmamux_softc *sc;
120	int i;
121
122	sc = device_get_softc(dev);
123
124	if (bus_alloc_resources(dev, dmamux_spec, sc->res)) {
125		device_printf(dev, "could not allocate resources\n");
126		return (ENXIO);
127	}
128
129	/* Memory interface */
130	for (i = 0; i < 4; i++) {
131		sc->bst[i] = rman_get_bustag(sc->res[i]);
132		sc->bsh[i] = rman_get_bushandle(sc->res[i]);
133	}
134
135	dmamux_sc = sc;
136
137	return (0);
138}
139
140static device_method_t dmamux_methods[] = {
141	DEVMETHOD(device_probe,		dmamux_probe),
142	DEVMETHOD(device_attach,	dmamux_attach),
143	{ 0, 0 }
144};
145
146static driver_t dmamux_driver = {
147	"dmamux",
148	dmamux_methods,
149	sizeof(struct dmamux_softc),
150};
151
152static devclass_t dmamux_devclass;
153
154DRIVER_MODULE(dmamux, simplebus, dmamux_driver, dmamux_devclass, 0, 0);
155