FreeBSD/Linux Kernel Cross Reference
sys/arm/freescale/imx/imx6_src.c

     /*-
      * Copyright (c) 2015 Oleksandr Tymoshenko <gonzo@freebsd.org>
      * 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.
     */
    
    #include <sys/cdefs.h>
    __FBSDID("$FreeBSD$");
    
    /*
     * System Reset Control for iMX6
     */
    
    #include <sys/param.h>
    #include <sys/systm.h>
    #include <sys/kernel.h>
    #include <sys/module.h>
    #include <sys/bus.h>
    #include <sys/rman.h>
    
    #include <dev/ofw/ofw_bus.h>
    #include <dev/ofw/ofw_bus_subr.h>
    
    #include <machine/bus.h>
    
    #include <arm/freescale/imx/imx6_src.h>
    
    #define SRC_SCR         0
    #define         SW_IPU1_RST     (1 << 3)
    
    struct src_softc {
            device_t        dev;
            struct resource *mem_res;
    };
    
    static struct src_softc *src_sc;
    
    static inline uint32_t
    RD4(struct src_softc *sc, bus_size_t off)
    {
    
            return (bus_read_4(sc->mem_res, off));
    }
    
    static inline void
    WR4(struct src_softc *sc, bus_size_t off, uint32_t val)
    {
    
            bus_write_4(sc->mem_res, off, val);
    }
    
    int
    src_reset_ipu(void)
    {
            uint32_t reg;
            int timeout = 10000;
    
            if (src_sc == NULL)
                    return (-1);
    
            reg = RD4(src_sc, SRC_SCR);
            reg |= SW_IPU1_RST;
            WR4(src_sc, SRC_SCR, reg);
    
            while (timeout-- > 0) {
                    reg = RD4(src_sc, SRC_SCR);
                    if (reg & SW_IPU1_RST)
                            DELAY(1);
                    else
                            break;
            }
    
            if (timeout < 0)
                    return (-1);
            else
                    return (0);
    }
    
    static int
   src_detach(device_t dev)
   {
           struct src_softc *sc;
   
           sc = device_get_softc(dev);
   
           if (sc->mem_res != NULL)
                   bus_release_resource(dev, SYS_RES_MEMORY, 0, sc->mem_res);
   
           return (0);
   }
   
   static int
   src_attach(device_t dev)
   {
           struct src_softc *sc;
           int err, rid;
   
           sc = device_get_softc(dev);
           err = 0;
   
           /* Allocate bus_space resources. */
           rid = 0;
           sc->mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid,
               RF_ACTIVE);
           if (sc->mem_res == NULL) {
                   device_printf(dev, "Cannot allocate memory resources\n");
                   err = ENXIO;
                   goto out;
           }
   
           src_sc = sc;
   
           err = 0;
   
   out:
   
           if (err != 0)
                   src_detach(dev);
   
           return (err);
   }
   
   static int
   src_probe(device_t dev)
   {
   
           if ((ofw_bus_is_compatible(dev, "fsl,imx6q-src") == 0) &&
               (ofw_bus_is_compatible(dev, "fsl,imx6-src") == 0))
                   return (ENXIO);
   
           device_set_desc(dev, "Freescale i.MX6 System Reset Controller");
   
           return (BUS_PROBE_DEFAULT);
   }
   
   static device_method_t src_methods[] = {
           /* Device interface */
           DEVMETHOD(device_probe,  src_probe),
           DEVMETHOD(device_attach, src_attach),
           DEVMETHOD(device_detach, src_detach),
   
           DEVMETHOD_END
   };
   
   static driver_t src_driver = {
           "src",
           src_methods,
           sizeof(struct src_softc)
   };
   
   static devclass_t src_devclass;
   
   DRIVER_MODULE(src, simplebus, src_driver, src_devclass, 0, 0);

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