2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
4 * Copyright (c) 2014 Ruslan Bukin <br@bsdpad.com>
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
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
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14 * documentation and/or other materials provided with the distribution.
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18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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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
30 * Vybrid Family Direct Memory Access Multiplexer (DMAMUX)
31 * Chapter 22, Vybrid Reference Manual, Rev. 5, 07/2013
34 #include <sys/cdefs.h>
35 __FBSDID("$FreeBSD$");
37 #include <sys/param.h>
38 #include <sys/systm.h>
40 #include <sys/kernel.h>
41 #include <sys/module.h>
42 #include <sys/malloc.h>
44 #include <sys/timeet.h>
45 #include <sys/timetc.h>
46 #include <sys/watchdog.h>
48 #include <dev/ofw/openfirm.h>
49 #include <dev/ofw/ofw_bus.h>
50 #include <dev/ofw/ofw_bus_subr.h>
52 #include <machine/bus.h>
53 #include <machine/cpu.h>
54 #include <machine/intr.h>
56 #include <arm/freescale/vybrid/vf_common.h>
57 #include <arm/freescale/vybrid/vf_dmamux.h>
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
66 struct resource *res[4];
67 bus_space_tag_t bst[4];
68 bus_space_handle_t bsh[4];
71 struct dmamux_softc *dmamux_sc;
73 static 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 */
82 dmamux_probe(device_t dev)
85 if (!ofw_bus_status_okay(dev))
88 if (!ofw_bus_is_compatible(dev, "fsl,mvf600-dmamux"))
91 device_set_desc(dev, "Vybrid Family Direct Memory Access Multiplexer");
92 return (BUS_PROBE_DEFAULT);
96 dmamux_configure(int mux, int source, int channel, int enable)
98 struct dmamux_softc *sc;
103 MUX_WRITE1(sc, mux, DMAMUX_CHCFG(channel), 0x0);
109 reg &= ~(CHCFG_SOURCE_MASK << CHCFG_SOURCE_SHIFT);
110 reg |= (source << CHCFG_SOURCE_SHIFT);
112 MUX_WRITE1(sc, mux, DMAMUX_CHCFG(channel), reg);
118 dmamux_attach(device_t dev)
120 struct dmamux_softc *sc;
123 sc = device_get_softc(dev);
125 if (bus_alloc_resources(dev, dmamux_spec, sc->res)) {
126 device_printf(dev, "could not allocate resources\n");
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]);
141 static device_method_t dmamux_methods[] = {
142 DEVMETHOD(device_probe, dmamux_probe),
143 DEVMETHOD(device_attach, dmamux_attach),
147 static driver_t dmamux_driver = {
150 sizeof(struct dmamux_softc),
153 static devclass_t dmamux_devclass;
155 DRIVER_MODULE(dmamux, simplebus, dmamux_driver, dmamux_devclass, 0, 0);