/* $NetBSD: jh71x0_eth.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: jh71x0_eth.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/fdt/syscon.h>

#include <dev/mii/miivar.h>

//#include <prop/proplib.h>

#include <riscv/starfive/jh71x0_eth.h>


/* Register definitions */

#define STARFIVE_GMAC_PHY_INFT_RGMII            0x1
#define STARFIVE_GMAC_PHY_INFT_RMII             0x4
#define STARFIVE_GMAC_PHY_INFT_MASK             __BITS(2, 0)

#define JH7100_SYSMAIN_REGISTER49_DLYCHAIN      0xc8

static void
jh71x0_eth_set_phy_rgmii_id(struct jh71x0_eth_softc *jh_sc)
{
        const uint32_t reg = jh_sc->sc_phy_syscon_reg;
        const uint32_t shift = jh_sc->sc_phy_syscon_shift;

        syscon_lock(jh_sc->sc_syscon);
        uint32_t val = syscon_read_4(jh_sc->sc_syscon, reg);
        val &= ~(STARFIVE_GMAC_PHY_INFT_MASK << shift);
        val |= STARFIVE_GMAC_PHY_INFT_RGMII << shift;
        syscon_write_4(jh_sc->sc_syscon, reg, val);

        if (jh_sc->sc_type == JH71X0ETH_GMAC) {
                syscon_write_4(jh_sc->sc_syscon,
                    JH7100_SYSMAIN_REGISTER49_DLYCHAIN, 4);
        }

        syscon_unlock(jh_sc->sc_syscon);
}


int
jh71x0_eth_attach(struct jh71x0_eth_softc *jh_sc, struct fdt_attach_args *faa,
    bus_space_handle_t *bshp)
{
        const int phandle = faa->faa_phandle;
        int phandle_phy;
        bus_addr_t addr;
        bus_size_t size;
        int error;
        int n;

        error = fdtbus_get_reg(phandle, 0, &addr, &size);
        if (error) {
                aprint_error(": couldn't get registers\n");
                return ENXIO;
        }

        int len;
        const u_int * const syscon_data =
            fdtbus_get_prop(phandle, "starfive,syscon", &len);
        if (syscon_data == NULL) {
                aprint_error(": couldn't get 'starfive,syscon' property\n");
                return ENXIO;
        }
        if (len != 3 * sizeof(uint32_t)) {
                aprint_error(": incorrect syscon data (len = %u)\n",
                    len);
                return ENXIO;
        }

        const int syscon_phandle =
            fdtbus_get_phandle_from_native(be32dec(&syscon_data[0]));

        jh_sc->sc_syscon = fdtbus_syscon_lookup(syscon_phandle);
        if (jh_sc->sc_syscon == NULL) {
                aprint_error(": couldn't get syscon\n");
                return ENXIO;
        }

        jh_sc->sc_phy_syscon_reg = be32dec(&syscon_data[1]);
        jh_sc->sc_phy_syscon_shift = be32dec(&syscon_data[2]);

        if (bus_space_map(faa->faa_bst, addr, size, 0, bshp) != 0) {
                aprint_error(": couldn't map registers\n");
                return ENXIO;
        }

        /* enable clocks */
        struct clk *clk;
        fdtbus_clock_assign(phandle);
        for (n = 0; (clk = fdtbus_clock_get_index(phandle, n)) != NULL; n++) {
                if (clk_enable(clk) != 0) {
                        aprint_error(": couldn't enable clock #%d\n", n);
                        return ENXIO;
                }
        }
        /* de-assert resets */
        struct fdtbus_reset *rst;
        for (n = 0; (rst = fdtbus_reset_get_index(phandle, n)) != NULL; n++) {
                if (fdtbus_reset_deassert(rst) != 0) {
                        aprint_error(": couldn't de-assert reset #%d\n", n);
                        return ENXIO;
                }
        }

        const char *phy_mode = fdtbus_get_string(phandle, "phy-mode");
        if (phy_mode == NULL)
                phy_mode = "rgmii-id";  /* default: RGMII */

        phandle_phy = fdtbus_get_phandle(phandle, "phy-handle");
        if (phandle_phy > 0) {
                of_getprop_uint32(phandle_phy, "reg", &jh_sc->sc_phy);
        }
        jh_sc->sc_phandle_phy = phandle_phy;

        if (strncmp(phy_mode, "rgmii-id", 8) == 0) {
                jh71x0_eth_set_phy_rgmii_id(jh_sc);
        } else {
                aprint_error(": unsupported phy-mode '%s'\n", phy_mode);
                return ENXIO;
        }

        if (!of_hasprop(phandle, "starfive,tx-use-rgmii-clk")) {
                jh_sc->sc_clk_tx = fdtbus_clock_get(phandle, "tx");
        }

        const uint8_t *macaddr = fdtbus_get_prop(phandle, "local-mac-address",
           &len);
        if (macaddr != NULL && len == ETHER_ADDR_LEN) {
                prop_dictionary_t prop = device_properties(jh_sc->sc_dev);
                prop_dictionary_set_data(prop, "mac-address", macaddr, len);
        }

        return 0;
}