FreeBSD/Linux Kernel Cross Reference
sys/arm/allwinner/aw_if_dwc.c

     /*-
      * Copyright (c) 2015 Luiz Otavio O Souza <loos@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("$FreeBSD$");
    
    #include <sys/param.h>
    #include <sys/systm.h>
    #include <sys/bus.h>
    #include <sys/kernel.h>
    #include <sys/module.h>
    
    #include <machine/bus.h>
    
    #include <dev/dwc/if_dwc.h>
    #include <dev/dwc/if_dwcvar.h>
    #include <dev/ofw/ofw_bus.h>
    #include <dev/ofw/ofw_bus_subr.h>
    
    #include <arm/allwinner/aw_machdep.h>
    #include <dev/extres/clk/clk.h>
    #include <dev/extres/regulator/regulator.h>
    
    #include "if_dwc_if.h"
    
    static int
    a20_if_dwc_probe(device_t dev)
    {
    
            if (!ofw_bus_status_okay(dev))
                    return (ENXIO);
            if (!ofw_bus_is_compatible(dev, "allwinner,sun7i-a20-gmac"))
                    return (ENXIO);
            device_set_desc(dev, "A20 Gigabit Ethernet Controller");
    
            return (BUS_PROBE_DEFAULT);
    }
    
    static int
    a20_if_dwc_init(device_t dev)
    {
            struct dwc_softc *sc;
            const char *tx_parent_name;
            clk_t clk_tx, clk_tx_parent;
            regulator_t reg;
            int error;
    
            sc = device_get_softc(dev);
    
            /* Configure PHY for MII or RGMII mode */
            switch(sc->phy_mode) {
            case PHY_MODE_RGMII:
                    tx_parent_name = "gmac_int_tx";
                    break;
            case PHY_MODE_MII:
                    tx_parent_name = "mii_phy_tx";
                    break;
            default:
                    device_printf(dev, "unsupported PHY connection type: %d",
                        sc->phy_mode);
                    return (ENXIO);
            }
    
            error = clk_get_by_ofw_name(dev, 0, "allwinner_gmac_tx", &clk_tx);
            if (error != 0) {
                    device_printf(dev, "could not get tx clk\n");
                    return (error);
            }
            error = clk_get_by_name(dev, tx_parent_name, &clk_tx_parent);
            if (error != 0) {
                    device_printf(dev, "could not get clock '%s'\n",
                        tx_parent_name);
                    return (error);
            }
            error = clk_set_parent_by_clk(clk_tx, clk_tx_parent);
            if (error != 0) {
                   device_printf(dev, "could not set tx clk parent\n");
                   return (error);
           }
   
           /* Enable PHY regulator if applicable */
           if (regulator_get_by_ofw_property(dev, 0, "phy-supply", &reg) == 0) {
                   error = regulator_enable(reg);
                   if (error != 0) {
                           device_printf(dev, "could not enable PHY regulator\n");
                           return (error);
                   }
           }
   
           return (0);
   }
   
   static int
   a20_if_dwc_mac_type(device_t dev)
   {
   
           return (DWC_GMAC_NORMAL_DESC);
   }
   
   static int
   a20_if_dwc_mii_clk(device_t dev)
   {
   
           return (GMAC_MII_CLK_150_250M_DIV102);
   }
   
   static device_method_t a20_dwc_methods[] = {
           DEVMETHOD(device_probe,         a20_if_dwc_probe),
   
           DEVMETHOD(if_dwc_init,          a20_if_dwc_init),
           DEVMETHOD(if_dwc_mac_type,      a20_if_dwc_mac_type),
           DEVMETHOD(if_dwc_mii_clk,       a20_if_dwc_mii_clk),
   
           DEVMETHOD_END
   };
   
   static devclass_t a20_dwc_devclass;
   
   extern driver_t dwc_driver;
   
   DEFINE_CLASS_1(dwc, a20_dwc_driver, a20_dwc_methods, sizeof(struct dwc_softc),
       dwc_driver);
   DRIVER_MODULE(a20_dwc, simplebus, a20_dwc_driver, a20_dwc_devclass, 0, 0);
   
   MODULE_DEPEND(a20_dwc, dwc, 1, 1, 1);

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