FreeBSD/Linux Kernel Cross Reference
sys/arm/freescale/vybrid/vf_dmamux.c

     /*-
      * Copyright (c) 2014 Ruslan Bukin <br@bsdpad.com>
      * All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
      * 1. Redistributions of source code must retain the above copyright
      *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     */
    
    /*
     * Vybrid Family Direct Memory Access Multiplexer (DMAMUX)
     * Chapter 22, Vybrid Reference Manual, Rev. 5, 07/2013
     */
    
    #include <sys/cdefs.h>
    __FBSDID("$FreeBSD: releng/11.0/sys/arm/freescale/vybrid/vf_dmamux.c 281085 2015-04-04 21:34:26Z andrew $");
    
    #include <sys/param.h>
    #include <sys/systm.h>
    #include <sys/bus.h>
    #include <sys/kernel.h>
    #include <sys/module.h>
    #include <sys/malloc.h>
    #include <sys/rman.h>
    #include <sys/timeet.h>
    #include <sys/timetc.h>
    #include <sys/watchdog.h>
    
    #include <dev/fdt/fdt_common.h>
    #include <dev/ofw/openfirm.h>
    #include <dev/ofw/ofw_bus.h>
    #include <dev/ofw/ofw_bus_subr.h>
    
    #include <machine/bus.h>
    #include <machine/cpu.h>
    #include <machine/intr.h>
    
    #include <arm/freescale/vybrid/vf_common.h>
    #include <arm/freescale/vybrid/vf_dmamux.h>
    
    #define DMAMUX_CHCFG(n)         (0x1 * n)       /* Channels 0-15 Cfg Reg */
    #define CHCFG_ENBL              (1 << 7)        /* Channel Enable */
    #define CHCFG_TRIG              (1 << 6)        /* Channel Trigger Enable */
    #define CHCFG_SOURCE_MASK       0x3f            /* Channel Source (Slot) */
    #define CHCFG_SOURCE_SHIFT      0
    
    struct dmamux_softc {
            struct resource         *res[4];
            bus_space_tag_t         bst[4];
            bus_space_handle_t      bsh[4];
    };
    
    struct dmamux_softc *dmamux_sc;
    
    static struct resource_spec dmamux_spec[] = {
            { SYS_RES_MEMORY,       0,      RF_ACTIVE }, /* DMAMUX0 */
            { SYS_RES_MEMORY,       1,      RF_ACTIVE }, /* DMAMUX1 */
            { SYS_RES_MEMORY,       2,      RF_ACTIVE }, /* DMAMUX2 */
            { SYS_RES_MEMORY,       3,      RF_ACTIVE }, /* DMAMUX3 */
            { -1, 0 }
    };
    
    static int
    dmamux_probe(device_t dev)
    {
    
            if (!ofw_bus_status_okay(dev))
                    return (ENXIO);
    
            if (!ofw_bus_is_compatible(dev, "fsl,mvf600-dmamux"))
                    return (ENXIO);
    
            device_set_desc(dev, "Vybrid Family Direct Memory Access Multiplexer");
            return (BUS_PROBE_DEFAULT);
    }
    
    int
    dmamux_configure(int mux, int source, int channel, int enable)
    {
            struct dmamux_softc *sc;
            int reg;
    
           sc = dmamux_sc;
   
           MUX_WRITE1(sc, mux, DMAMUX_CHCFG(channel), 0x0);
   
           reg = 0;
           if (enable)
                   reg |= (CHCFG_ENBL);
   
           reg &= ~(CHCFG_SOURCE_MASK << CHCFG_SOURCE_SHIFT);
           reg |= (source << CHCFG_SOURCE_SHIFT);
   
           MUX_WRITE1(sc, mux, DMAMUX_CHCFG(channel), reg);
   
           return (0);
   }
   
   static int
   dmamux_attach(device_t dev)
   {
           struct dmamux_softc *sc;
           int i;
   
           sc = device_get_softc(dev);
   
           if (bus_alloc_resources(dev, dmamux_spec, sc->res)) {
                   device_printf(dev, "could not allocate resources\n");
                   return (ENXIO);
           }
   
           /* Memory interface */
           for (i = 0; i < 4; i++) {
                   sc->bst[i] = rman_get_bustag(sc->res[i]);
                   sc->bsh[i] = rman_get_bushandle(sc->res[i]);
           }
   
           dmamux_sc = sc;
   
           return (0);
   }
   
   static device_method_t dmamux_methods[] = {
           DEVMETHOD(device_probe,         dmamux_probe),
           DEVMETHOD(device_attach,        dmamux_attach),
           { 0, 0 }
   };
   
   static driver_t dmamux_driver = {
           "dmamux",
           dmamux_methods,
           sizeof(struct dmamux_softc),
   };
   
   static devclass_t dmamux_devclass;
   
   DRIVER_MODULE(dmamux, simplebus, dmamux_driver, dmamux_devclass, 0, 0);

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