/* $NetBSD: fdt_dai.c,v 1.3 2018/06/30 20:34:43 jmcneill Exp $ */

/*-
* Copyright (c) 2018 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_dai.c,v 1.3 2018/06/30 20:34:43 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_dai_controller {
       device_t dc_dev;
       int dc_phandle;
       const struct fdtbus_dai_controller_func *dc_funcs;

       LIST_ENTRY(fdtbus_dai_controller) dc_next;
};

static LIST_HEAD(, fdtbus_dai_controller) fdtbus_dai_controllers =
   LIST_HEAD_INITIALIZER(fdtbus_dai_controllers);

int
fdtbus_register_dai_controller(device_t dev, int phandle,
   const struct fdtbus_dai_controller_func *funcs)
{
       struct fdtbus_dai_controller *dc;

       dc = kmem_alloc(sizeof(*dc), KM_SLEEP);
       dc->dc_dev = dev;
       dc->dc_phandle = phandle;
       dc->dc_funcs = funcs;

       LIST_INSERT_HEAD(&fdtbus_dai_controllers, dc, dc_next);

       return 0;
}

static struct fdtbus_dai_controller *
fdtbus_get_dai_controller(int phandle)
{
       struct fdtbus_dai_controller *dc;

       LIST_FOREACH(dc, &fdtbus_dai_controllers, dc_next) {
               if (dc->dc_phandle == phandle)
                       return dc;
       }

       return NULL;
}

audio_dai_tag_t
fdtbus_dai_acquire(int phandle, const char *prop)
{
       return fdtbus_dai_acquire_index(phandle, prop, 0);
}

audio_dai_tag_t
fdtbus_dai_acquire_index(int phandle, const char *prop, int index)
{
       struct fdtbus_dai_controller *dc;
       const uint32_t *dais, *p;
       u_int n, dai_cells;
       int len, resid;

       dais = fdtbus_get_prop(phandle, prop, &len);
       if (dais == NULL)
               return NULL;

       p = dais;
       for (n = 0, resid = len; resid > 0; n++) {
               const int dc_phandle =
                   fdtbus_get_phandle_from_native(be32toh(p[0]));
               if (of_getprop_uint32(dc_phandle, "#sound-dai-cells", &dai_cells))
                       dai_cells = 0;
               if (n == index) {
                       dc = fdtbus_get_dai_controller(dc_phandle);
                       if (dc == NULL)
                               return NULL;
                       return dc->dc_funcs->get_tag(dc->dc_dev,
                           &p[0], (dai_cells + 1) * 4);
               }
               resid -= (dai_cells + 1) * 4;
               p += dai_cells + 1;
       }

       return NULL;
}