/* $NetBSD: jh7100_gmac.c,v 1.1 2024/10/26 15:49:43 skrll Exp $ */

/*-
* Copyright (c) 2024 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Nick Hudson
*
* 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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>
__KERNEL_RCSID(0, "$NetBSD: jh7100_gmac.c,v 1.1 2024/10/26 15:49:43 skrll Exp $");

#include <sys/param.h>

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

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

#include <dev/fdt/fdtvar.h>

#include <dev/mii/miivar.h>

#include <dev/ic/dwc_gmac_var.h>
#include <dev/ic/dwc_gmac_reg.h>

#include <prop/proplib.h>

#include <riscv/starfive/jh71x0_eth.h>

struct jh7100_gmac_softc {
       struct dwc_gmac_softc   sc_gmac;
       struct jh71x0_eth_softc sc_jh71x0eth;
};

static void
jh7100_gmac_set_speed(struct dwc_gmac_softc *gmac_sc, int speed)
{
       struct jh7100_gmac_softc * const sc =
           container_of(gmac_sc, struct jh7100_gmac_softc, sc_gmac);
       struct jh71x0_eth_softc * const jheth_sc = &sc->sc_jh71x0eth;

       u_int rate = clk_get_rate(jheth_sc->sc_clk_tx);
       switch (speed) {
       case IFM_10_T:
               rate = 2500000;
               break;
       case IFM_100_TX:
               rate = 25000000;
               break;
       case IFM_1000_T:
               rate = 125000000;
       default:
               // error unsupported
               break;
       }

       int error = clk_set_rate(jheth_sc->sc_clk_tx, rate);
       if (error)
               aprint_error_dev(jheth_sc->sc_dev, "failed to set TX rate %u",
                   rate);
}

static int
jh7100_gmac_intr(void *arg)
{
       return dwc_gmac_intr(arg);
}

/* Compat string(s) */
static const struct device_compatible_entry compat_data[] = {
       { .compat = "starfive,jh7100-dwmac" },
       DEVICE_COMPAT_EOL
};

static int
jh7100_gmac_match(device_t parent, cfdata_t cf, void *aux)
{
       struct fdt_attach_args * const faa = aux;

       return of_compatible_match(faa->faa_phandle, compat_data);
}

static void
jh7100_gmac_attach(device_t parent, device_t self, void *aux)
{
       struct jh7100_gmac_softc * const sc = device_private(self);
       struct jh71x0_eth_softc * const jheth_sc = &sc->sc_jh71x0eth;
       struct dwc_gmac_softc * const gmac_sc = &sc->sc_gmac;
       struct fdt_attach_args * const faa = aux;
       const int phandle = faa->faa_phandle;
       char intrstr[128];
       int error;

       sc->sc_gmac.sc_dev = self;
       sc->sc_gmac.sc_bst = faa->faa_bst;
       sc->sc_gmac.sc_dmat = faa->faa_dmat;
       sc->sc_jh71x0eth.sc_dev = self;
       sc->sc_jh71x0eth.sc_phy = MII_PHY_ANY;
       sc->sc_jh71x0eth.sc_type = JH71X0ETH_GMAC;

       error = jh71x0_eth_attach(jheth_sc, faa, &sc->sc_gmac.sc_bsh);
       if (error)
               return;

       if (sc->sc_jh71x0eth.sc_clk_tx) {
               sc->sc_gmac.sc_set_speed = jh7100_gmac_set_speed;
       }

       aprint_naive("\n");
       aprint_normal(": Gigabit Ethernet Controller\n");

       error = dwc_gmac_attach(gmac_sc, sc->sc_jh71x0eth.sc_phy,
           GMAC_MII_CLK_150_250M_DIV102);
       if (error)
               return;

       if (!fdtbus_intr_str(phandle, 0, intrstr, sizeof(intrstr))) {
               aprint_error(": failed to decode interrupt\n");
               return;
       }
       void *ih = fdtbus_intr_establish_xname(phandle, 0, IPL_NET,
           FDT_INTR_MPSAFE, jh7100_gmac_intr, sc, device_xname(self));
       if (ih == NULL) {
               aprint_error_dev(self, "failed to establish interrupt on %s\n",
                   intrstr);
               // XXXNH unwind
               return;
       }
       aprint_normal_dev(self, "interrupting on %s\n", intrstr);
}


CFATTACH_DECL_NEW(jh7100_gmac, sizeof(struct jh7100_gmac_softc),
   jh7100_gmac_match, jh7100_gmac_attach, NULL, NULL);