FreeBSD/Linux Kernel Cross Reference
sys/arm/freescale/vybrid/vf_tcon.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 Timing Controller (TCON)
     * Chapter 58, Vybrid Reference Manual, Rev. 5, 07/2013
     */
    
    #include <sys/cdefs.h>
    __FBSDID("$FreeBSD: releng/11.0/sys/arm/freescale/vybrid/vf_tcon.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>
    
    #define TCON0_CTRL1     0x00
    #define TCON_BYPASS     (1 << 29)
    
    struct tcon_softc {
            struct resource         *res[1];
            bus_space_tag_t         bst;
            bus_space_handle_t      bsh;
    };
    
    struct tcon_softc *tcon_sc;
    
    static struct resource_spec tcon_spec[] = {
            { SYS_RES_MEMORY,       0,      RF_ACTIVE },
            { -1, 0 }
    };
    
    uint32_t
    tcon_bypass(void)
    {
            struct tcon_softc *sc;
    
            if (tcon_sc == NULL)
                    return (1);
    
            sc = tcon_sc;
    
            WRITE4(tcon_sc, TCON0_CTRL1, TCON_BYPASS);
    
            return (0);
    }
    
    static int
    tcon_probe(device_t dev)
    {
    
            if (!ofw_bus_status_okay(dev))
                    return (ENXIO);
    
            if (!ofw_bus_is_compatible(dev, "fsl,mvf600-tcon"))
                    return (ENXIO);
    
            device_set_desc(dev, "Vybrid Family Timing Controller (TCON)");
            return (BUS_PROBE_DEFAULT);
   }
   
   static int
   tcon_attach(device_t dev)
   {
           struct tcon_softc *sc;
   
           sc = device_get_softc(dev);
   
           if (bus_alloc_resources(dev, tcon_spec, sc->res)) {
                   device_printf(dev, "could not allocate resources\n");
                   return (ENXIO);
           }
   
           /* Memory interface */
           sc->bst = rman_get_bustag(sc->res[0]);
           sc->bsh = rman_get_bushandle(sc->res[0]);
   
           tcon_sc = sc;
   
           return (0);
   }
   
   static device_method_t tcon_methods[] = {
           DEVMETHOD(device_probe,         tcon_probe),
           DEVMETHOD(device_attach,        tcon_attach),
           { 0, 0 }
   };
   
   static driver_t tcon_driver = {
           "tcon",
           tcon_methods,
           sizeof(struct tcon_softc),
   };
   
   static devclass_t tcon_devclass;
   
   DRIVER_MODULE(tcon, simplebus, tcon_driver, tcon_devclass, 0, 0);

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