Home | History | Annotate | Line # | Download | only in fdt
fdt_dma_machdep.c revision 1.2 
      1 /*	$NetBSD: fdt_dma_machdep.c,v 1.2 2023/05/07 12:41:48 skrll Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2022 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Nick Hudson
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 #include <sys/cdefs.h>
     33 __KERNEL_RCSID(0, "$NetBSD: fdt_dma_machdep.c,v 1.2 2023/05/07 12:41:48 skrll Exp $");
     34 
     35 #include <sys/param.h>
     36 #include <sys/bus.h>
     37 #include <sys/kmem.h>
     38 
     39 #include <dev/fdt/fdtvar.h>
     40 
     41 extern struct riscv_bus_dma_tag riscv_generic_dma_tag;
     42 
     43 bus_dma_tag_t
     44 fdtbus_dma_tag_create(int phandle, const struct fdt_dma_range *ranges,
     45     u_int nranges)
     46 {
     47 	struct riscv_bus_dma_tag *tagp;
     48 	u_int n;
     49 
     50 	// Check bindings.
     51 	const int flags = of_hasprop(phandle, "dma-coherent") ?
     52 	    _BUS_DMAMAP_COHERENT : 0;
     53 
     54 	tagp = kmem_alloc(sizeof(*tagp), KM_SLEEP);
     55 	*tagp = riscv_generic_dma_tag;
     56 	if (nranges == 0) {
     57 		tagp->_nranges = 1;
     58 		tagp->_ranges = kmem_alloc(sizeof(*tagp->_ranges), KM_SLEEP);
     59 		tagp->_ranges[0].dr_sysbase = 0;
     60 		tagp->_ranges[0].dr_busbase = 0;
     61 		tagp->_ranges[0].dr_len = UINTPTR_MAX;
     62 		tagp->_ranges[0].dr_flags = flags;
     63 	} else {
     64 		tagp->_nranges = nranges;
     65 		tagp->_ranges = kmem_alloc(sizeof(*tagp->_ranges) * nranges,
     66 		    KM_SLEEP);
     67 		for (n = 0; n < nranges; n++) {
     68 			tagp->_ranges[n].dr_sysbase = ranges[n].dr_sysbase;
     69 			tagp->_ranges[n].dr_busbase = ranges[n].dr_busbase;
     70 			tagp->_ranges[n].dr_len = ranges[n].dr_len;
     71 			tagp->_ranges[n].dr_flags = flags;
     72 		}
     73 	}
     74 
     75 	return tagp;
     76 }
     77