/* $NetBSD: rgmii.c,v 1.2 2020/07/06 09:34:17 rin Exp $ */
/*
* Copyright (c) 2010 KIYOHARA Takashi
* 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 ``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 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>
__KERNEL_RCSID(0, "$NetBSD: rgmii.c,v 1.2 2020/07/06 09:34:17 rin Exp $");

#include <sys/param.h>
#include <sys/bus.h>
#include <sys/device.h>

#include <net/if.h>
#include <net/if_media.h>

#include <powerpc/ibm4xx/dev/rgmiireg.h>
#include <powerpc/ibm4xx/dev/rmiivar.h>
#include <powerpc/ibm4xx/dev/opbvar.h>


static void rgmii_enable(device_t, int);
static void rgmii_disable(device_t, int);
static void rgmii_speed(device_t, int, int);


void
rgmii_attach(device_t self, int instance,
            void (**enable)(device_t, int),
            void (**disable)(device_t, int),
            void (**speed)(device_t, int, int))
{
       struct opb_softc *sc = device_private(self);
       uint32_t ssr;

       instance %= 2;

       rgmii_disable(self, instance);
       ssr = bus_space_read_4(sc->sc_iot, sc->sc_rgmiih, RGMII0_SSR);
       ssr &= ~SSR_SP(instance, SSR_SP_MASK);
       bus_space_write_4(sc->sc_iot, sc->sc_rgmiih, RGMII0_SSR, ssr);

       *enable = rgmii_enable;
       *disable = rgmii_disable;
       *speed = rgmii_speed;
}

static void
rgmii_enable(device_t self, int instance)
{
       struct opb_softc *sc = device_private(self);
       uint32_t fer;

       instance %= 2;

       fer = bus_space_read_4(sc->sc_iot, sc->sc_rgmiih, RGMII0_FER);
       fer &= ~FER_MDIOEN_MASK;
       fer |= FER_MDIOEN(instance);
       bus_space_write_4(sc->sc_iot, sc->sc_rgmiih, RGMII0_FER, fer);
}

static void
rgmii_disable(device_t self, int instance)
{
       struct opb_softc *sc = device_private(self);
       uint32_t fer;

       instance %= 2;

       fer = bus_space_read_4(sc->sc_iot, sc->sc_rgmiih, RGMII0_FER);
       fer &= ~FER_MDIOEN_MASK;
       bus_space_write_4(sc->sc_iot, sc->sc_rgmiih, RGMII0_FER, fer);
}

static void
rgmii_speed(device_t self, int instance, int speed)
{
       struct opb_softc *sc = device_private(self);
       uint32_t ssr;

       instance %= 2;

       ssr = bus_space_read_4(sc->sc_iot, sc->sc_rgmiih, RGMII0_SSR);
       ssr &= ~SSR_SP(instance, SSR_SP_MASK);
       switch (speed) {
       case IFM_1000_T:
               ssr |= SSR_SP(instance, SSR_SP_1000MBPS);
               break;
       case IFM_100_TX:
               ssr |= SSR_SP(instance, SSR_SP_100MBPS);
               break;
       case IFM_10_T:
               ssr |= SSR_SP(instance, SSR_SP_10MBPS);
               break;
       }
       bus_space_write_4(sc->sc_iot, sc->sc_rgmiih, RGMII0_SSR, ssr);
}