/*      $NetBSD: fdt_dma_machdep.c,v 1.2 2023/05/07 12:41:48 skrll Exp $        */

/*-
* Copyright (c) 2022 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: fdt_dma_machdep.c,v 1.2 2023/05/07 12:41:48 skrll Exp $");

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

#include <dev/fdt/fdtvar.h>

extern struct riscv_bus_dma_tag riscv_generic_dma_tag;

bus_dma_tag_t
fdtbus_dma_tag_create(int phandle, const struct fdt_dma_range *ranges,
   u_int nranges)
{
       struct riscv_bus_dma_tag *tagp;
       u_int n;

       // Check bindings.
       const int flags = of_hasprop(phandle, "dma-coherent") ?
           _BUS_DMAMAP_COHERENT : 0;

       tagp = kmem_alloc(sizeof(*tagp), KM_SLEEP);
       *tagp = riscv_generic_dma_tag;
       if (nranges == 0) {
               tagp->_nranges = 1;
               tagp->_ranges = kmem_alloc(sizeof(*tagp->_ranges), KM_SLEEP);
               tagp->_ranges[0].dr_sysbase = 0;
               tagp->_ranges[0].dr_busbase = 0;
               tagp->_ranges[0].dr_len = UINTPTR_MAX;
               tagp->_ranges[0].dr_flags = flags;
       } else {
               tagp->_nranges = nranges;
               tagp->_ranges = kmem_alloc(sizeof(*tagp->_ranges) * nranges,
                   KM_SLEEP);
               for (n = 0; n < nranges; n++) {
                       tagp->_ranges[n].dr_sysbase = ranges[n].dr_sysbase;
                       tagp->_ranges[n].dr_busbase = ranges[n].dr_busbase;
                       tagp->_ranges[n].dr_len = ranges[n].dr_len;
                       tagp->_ranges[n].dr_flags = flags;
               }
       }

       return tagp;
}