/* $NetBSD: fdt_phy.c,v 1.6 2019/10/30 21:37:36 jmcneill Exp $ */

/*-
 * Copyright (c) 2015-2017 Jared McNeill <jmcneill@invisible.ca>
 * 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: fdt_phy.c,v 1.6 2019/10/30 21:37:36 jmcneill Exp $");

#include <sys/param.h>
#include <sys/bus.h>
#include <sys/kmem.h>
#include <sys/queue.h>

#include <libfdt.h>
#include <dev/fdt/fdtvar.h>

struct fdtbus_phy_controller {
        device_t pc_dev;
        int pc_phandle;
        const struct fdtbus_phy_controller_func *pc_funcs;

        LIST_ENTRY(fdtbus_phy_controller) pc_next;
};

static LIST_HEAD(, fdtbus_phy_controller) fdtbus_phy_controllers =
    LIST_HEAD_INITIALIZER(fdtbus_phy_controllers);

int
fdtbus_register_phy_controller(device_t dev, int phandle,
    const struct fdtbus_phy_controller_func *funcs)
{
        struct fdtbus_phy_controller *pc;

        pc = kmem_alloc(sizeof(*pc), KM_SLEEP);
        pc->pc_dev = dev;
        pc->pc_phandle = phandle;
        pc->pc_funcs = funcs;

        LIST_INSERT_HEAD(&fdtbus_phy_controllers, pc, pc_next);

        return 0;
}

static struct fdtbus_phy_controller *
fdtbus_get_phy_controller(int phandle)
{
        struct fdtbus_phy_controller *pc;

        LIST_FOREACH(pc, &fdtbus_phy_controllers, pc_next) {
                if (pc->pc_phandle == phandle)
                        return pc;
        }

        return NULL;
}

struct fdtbus_phy *
fdtbus_phy_get_index(int phandle, u_int index)
{
        struct fdtbus_phy_controller *pc;
        struct fdtbus_phy *phy = NULL;
        void *phy_priv = NULL;
        uint32_t *phys = NULL;
        uint32_t *p;
        u_int n, phy_cells;
        int len, resid;

        len = OF_getproplen(phandle, "phys");
        if (len <= 0)
                return NULL;

        phys = kmem_alloc(len, KM_SLEEP);
        if (OF_getprop(phandle, "phys", phys, len) != len) {
                kmem_free(phys, len);
                return NULL;
        }

        p = phys;
        for (n = 0, resid = len; resid > 0; n++) {
                if (p[0] == 0) {
                        phy_cells = 0;
                        goto next;
                }
                const int pc_phandle =
                    fdtbus_get_phandle_from_native(be32toh(p[0]));
                if (of_getprop_uint32(pc_phandle, "#phy-cells", &phy_cells))
                        break;
                if (n == index) {
                        pc = fdtbus_get_phy_controller(pc_phandle);
                        if (pc == NULL)
                                goto done;
                        phy_priv = pc->pc_funcs->acquire(pc->pc_dev,
                            phy_cells > 0 ? &p[1] : NULL, phy_cells * 4);
                        if (phy_priv) {
                                phy = kmem_alloc(sizeof(*phy), KM_SLEEP);
                                phy->phy_pc = pc;
                                phy->phy_priv = phy_priv;
                        }
                        break;
                }
next:
                resid -= (phy_cells + 1) * 4;
                p += phy_cells + 1;
        }

done:
        if (phys)
                kmem_free(phys, len);

        return phy;
}

struct fdtbus_phy *
fdtbus_phy_get(int phandle, const char *phyname)
{
        u_int index;
        int err;

        err = fdtbus_get_index(phandle, "phy-names", phyname, &index);
        if (err != 0)
                return NULL;

        return fdtbus_phy_get_index(phandle, index);
}

void
fdtbus_phy_put(struct fdtbus_phy *phy)
{
        struct fdtbus_phy_controller *pc = phy->phy_pc;

        pc->pc_funcs->release(pc->pc_dev, phy->phy_priv);
        kmem_free(phy, sizeof(*phy));
}

device_t
fdtbus_phy_device(struct fdtbus_phy *phy)
{
        return phy->phy_pc->pc_dev;
}

int
fdtbus_phy_enable(struct fdtbus_phy *phy, bool enable)
{
        struct fdtbus_phy_controller *pc = phy->phy_pc;

        return pc->pc_funcs->enable(pc->pc_dev, phy->phy_priv, enable);
}