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

/*-
* Copyright (c) 2015-2017 Jared McNeill <[email protected]>
* 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);
}