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