vf_dmamux.c revision 330897 
1/*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (c) 2014 Ruslan Bukin <br@bsdpad.com>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29/*
30 * Vybrid Family Direct Memory Access Multiplexer (DMAMUX)
31 * Chapter 22, Vybrid Reference Manual, Rev. 5, 07/2013
32 */
33
34#include <sys/cdefs.h>
35__FBSDID("$FreeBSD: stable/11/sys/arm/freescale/vybrid/vf_dmamux.c 330897 2018-03-14 03:19:51Z eadler $");
36
37#include <sys/param.h>
38#include <sys/systm.h>
39#include <sys/bus.h>
40#include <sys/kernel.h>
41#include <sys/module.h>
42#include <sys/malloc.h>
43#include <sys/rman.h>
44#include <sys/timeet.h>
45#include <sys/timetc.h>
46#include <sys/watchdog.h>
47
48#include <dev/fdt/fdt_common.h>
49#include <dev/ofw/openfirm.h>
50#include <dev/ofw/ofw_bus.h>
51#include <dev/ofw/ofw_bus_subr.h>
52
53#include <machine/bus.h>
54#include <machine/cpu.h>
55#include <machine/intr.h>
56
57#include <arm/freescale/vybrid/vf_common.h>
58#include <arm/freescale/vybrid/vf_dmamux.h>
59
60#define	DMAMUX_CHCFG(n)		(0x1 * n)	/* Channels 0-15 Cfg Reg */
61#define	CHCFG_ENBL		(1 << 7)	/* Channel Enable */
62#define	CHCFG_TRIG		(1 << 6)	/* Channel Trigger Enable */
63#define	CHCFG_SOURCE_MASK	0x3f		/* Channel Source (Slot) */
64#define	CHCFG_SOURCE_SHIFT	0
65
66struct dmamux_softc {
67	struct resource		*res[4];
68	bus_space_tag_t		bst[4];
69	bus_space_handle_t	bsh[4];
70};
71
72struct dmamux_softc *dmamux_sc;
73
74static struct resource_spec dmamux_spec[] = {
75	{ SYS_RES_MEMORY,	0,	RF_ACTIVE }, /* DMAMUX0 */
76	{ SYS_RES_MEMORY,	1,	RF_ACTIVE }, /* DMAMUX1 */
77	{ SYS_RES_MEMORY,	2,	RF_ACTIVE }, /* DMAMUX2 */
78	{ SYS_RES_MEMORY,	3,	RF_ACTIVE }, /* DMAMUX3 */
79	{ -1, 0 }
80};
81
82static int
83dmamux_probe(device_t dev)
84{
85
86	if (!ofw_bus_status_okay(dev))
87		return (ENXIO);
88
89	if (!ofw_bus_is_compatible(dev, "fsl,mvf600-dmamux"))
90		return (ENXIO);
91
92	device_set_desc(dev, "Vybrid Family Direct Memory Access Multiplexer");
93	return (BUS_PROBE_DEFAULT);
94}
95
96int
97dmamux_configure(int mux, int source, int channel, int enable)
98{
99	struct dmamux_softc *sc;
100	int reg;
101
102	sc = dmamux_sc;
103
104	MUX_WRITE1(sc, mux, DMAMUX_CHCFG(channel), 0x0);
105
106	reg = 0;
107	if (enable)
108		reg |= (CHCFG_ENBL);
109
110	reg &= ~(CHCFG_SOURCE_MASK << CHCFG_SOURCE_SHIFT);
111	reg |= (source << CHCFG_SOURCE_SHIFT);
112
113	MUX_WRITE1(sc, mux, DMAMUX_CHCFG(channel), reg);
114
115	return (0);
116}
117
118static int
119dmamux_attach(device_t dev)
120{
121	struct dmamux_softc *sc;
122	int i;
123
124	sc = device_get_softc(dev);
125
126	if (bus_alloc_resources(dev, dmamux_spec, sc->res)) {
127		device_printf(dev, "could not allocate resources\n");
128		return (ENXIO);
129	}
130
131	/* Memory interface */
132	for (i = 0; i < 4; i++) {
133		sc->bst[i] = rman_get_bustag(sc->res[i]);
134		sc->bsh[i] = rman_get_bushandle(sc->res[i]);
135	}
136
137	dmamux_sc = sc;
138
139	return (0);
140}
141
142static device_method_t dmamux_methods[] = {
143	DEVMETHOD(device_probe,		dmamux_probe),
144	DEVMETHOD(device_attach,	dmamux_attach),
145	{ 0, 0 }
146};
147
148static driver_t dmamux_driver = {
149	"dmamux",
150	dmamux_methods,
151	sizeof(struct dmamux_softc),
152};
153
154static devclass_t dmamux_devclass;
155
156DRIVER_MODULE(dmamux, simplebus, dmamux_driver, dmamux_devclass, 0, 0);
157