f3a72e40b5
- Enhanced Direct Memory Access Controller (eDMA) - Direct Memory Access Multiplexer (DMAMUX)
156 lines
4.1 KiB
C
156 lines
4.1 KiB
C
/*-
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* Copyright (c) 2014 Ruslan Bukin <br@bsdpad.com>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/*
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* Vybrid Family Direct Memory Access Multiplexer (DMAMUX)
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* Chapter 22, Vybrid Reference Manual, Rev. 5, 07/2013
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/bus.h>
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#include <sys/kernel.h>
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#include <sys/module.h>
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#include <sys/malloc.h>
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#include <sys/rman.h>
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#include <sys/timeet.h>
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#include <sys/timetc.h>
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#include <sys/watchdog.h>
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#include <dev/fdt/fdt_common.h>
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#include <dev/ofw/openfirm.h>
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#include <dev/ofw/ofw_bus.h>
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#include <dev/ofw/ofw_bus_subr.h>
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#include <machine/bus.h>
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#include <machine/fdt.h>
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#include <machine/cpu.h>
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#include <machine/intr.h>
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#include <arm/freescale/vybrid/vf_common.h>
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#include <arm/freescale/vybrid/vf_dmamux.h>
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#define DMAMUX_CHCFG(n) (0x1 * n) /* Channels 0-15 Cfg Reg */
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#define CHCFG_ENBL (1 << 7) /* Channel Enable */
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#define CHCFG_TRIG (1 << 6) /* Channel Trigger Enable */
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#define CHCFG_SOURCE_MASK 0x3f /* Channel Source (Slot) */
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#define CHCFG_SOURCE_SHIFT 0
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struct dmamux_softc {
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struct resource *res[4];
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bus_space_tag_t bst[4];
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bus_space_handle_t bsh[4];
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};
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struct dmamux_softc *dmamux_sc;
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static struct resource_spec dmamux_spec[] = {
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{ SYS_RES_MEMORY, 0, RF_ACTIVE }, /* DMAMUX0 */
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{ SYS_RES_MEMORY, 1, RF_ACTIVE }, /* DMAMUX1 */
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{ SYS_RES_MEMORY, 2, RF_ACTIVE }, /* DMAMUX2 */
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{ SYS_RES_MEMORY, 3, RF_ACTIVE }, /* DMAMUX3 */
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{ -1, 0 }
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};
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static int
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dmamux_probe(device_t dev)
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{
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if (!ofw_bus_status_okay(dev))
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return (ENXIO);
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if (!ofw_bus_is_compatible(dev, "fsl,mvf600-dmamux"))
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return (ENXIO);
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device_set_desc(dev, "Vybrid Family Direct Memory Access Multiplexer");
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return (BUS_PROBE_DEFAULT);
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}
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int
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dmamux_configure(int mux, int source, int channel, int enable)
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{
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struct dmamux_softc *sc;
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int reg;
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sc = dmamux_sc;
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MUX_WRITE1(sc, mux, DMAMUX_CHCFG(channel), 0x0);
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reg = 0;
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if (enable)
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reg |= (CHCFG_ENBL);
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reg &= ~(CHCFG_SOURCE_MASK << CHCFG_SOURCE_SHIFT);
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reg |= (source << CHCFG_SOURCE_SHIFT);
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MUX_WRITE1(sc, mux, DMAMUX_CHCFG(channel), reg);
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return (0);
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}
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static int
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dmamux_attach(device_t dev)
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{
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struct dmamux_softc *sc;
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int i;
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sc = device_get_softc(dev);
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if (bus_alloc_resources(dev, dmamux_spec, sc->res)) {
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device_printf(dev, "could not allocate resources\n");
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return (ENXIO);
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}
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/* Memory interface */
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for (i = 0; i < 4; i++) {
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sc->bst[i] = rman_get_bustag(sc->res[i]);
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sc->bsh[i] = rman_get_bushandle(sc->res[i]);
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}
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dmamux_sc = sc;
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return (0);
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}
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static device_method_t dmamux_methods[] = {
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DEVMETHOD(device_probe, dmamux_probe),
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DEVMETHOD(device_attach, dmamux_attach),
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{ 0, 0 }
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};
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static driver_t dmamux_driver = {
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"dmamux",
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dmamux_methods,
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sizeof(struct dmamux_softc),
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};
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static devclass_t dmamux_devclass;
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DRIVER_MODULE(dmamux, simplebus, dmamux_driver, dmamux_devclass, 0, 0);
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