/* $NetBSD: fdt_dma_machdep.c,v 1.1 2020/02/20 01:35:55 jmcneill Exp $ */

/* $NetBSD: fdt_dma_machdep.c,v 1.1 2020/02/20 01:35:55 jmcneill Exp $ */

/*-
* Copyright (c) 2020 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_dma_machdep.c,v 1.1 2020/02/20 01:35:55 jmcneill Exp $");

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

#include <dev/fdt/fdtvar.h>

extern struct arm32_bus_dma_tag arm_generic_dma_tag;

bus_dma_tag_t
fdtbus_dma_tag_create(int phandle, const struct fdt_dma_range *ranges,
u_int nranges)
{
struct arm32_bus_dma_tag *tagp;
u_int n;

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

tagp = kmem_alloc(sizeof(*tagp), KM_SLEEP);
*tagp = arm_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;
}