1 /* $NetBSD: fdt_dma_machdep.c,v 1.1 2020/02/20 01:35:55 jmcneill Exp $ */ 2 3 /*- 4 * Copyright (c) 2020 Jared McNeill <jmcneill@invisible.ca> 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 22 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #include <sys/cdefs.h> 30 __KERNEL_RCSID(0, "$NetBSD: fdt_dma_machdep.c,v 1.1 2020/02/20 01:35:55 jmcneill Exp $"); 31 32 #include <sys/param.h> 33 #include <sys/bus.h> 34 #include <sys/kmem.h> 35 36 #include <dev/fdt/fdtvar.h> 37 38 extern struct arm32_bus_dma_tag arm_generic_dma_tag; 39 40 bus_dma_tag_t 41 fdtbus_dma_tag_create(int phandle, const struct fdt_dma_range *ranges, 42 u_int nranges) 43 { 44 struct arm32_bus_dma_tag *tagp; 45 u_int n; 46 47 const int flags = of_hasprop(phandle, "dma-coherent") ? 48 _BUS_DMAMAP_COHERENT : 0; 49 50 tagp = kmem_alloc(sizeof(*tagp), KM_SLEEP); 51 *tagp = arm_generic_dma_tag; 52 if (nranges == 0) { 53 tagp->_nranges = 1; 54 tagp->_ranges = kmem_alloc(sizeof(*tagp->_ranges), KM_SLEEP); 55 tagp->_ranges[0].dr_sysbase = 0; 56 tagp->_ranges[0].dr_busbase = 0; 57 tagp->_ranges[0].dr_len = UINTPTR_MAX; 58 tagp->_ranges[0].dr_flags = flags; 59 } else { 60 tagp->_nranges = nranges; 61 tagp->_ranges = kmem_alloc(sizeof(*tagp->_ranges) * nranges, 62 KM_SLEEP); 63 for (n = 0; n < nranges; n++) { 64 tagp->_ranges[n].dr_sysbase = ranges[n].dr_sysbase; 65 tagp->_ranges[n].dr_busbase = ranges[n].dr_busbase; 66 tagp->_ranges[n].dr_len = ranges[n].dr_len; 67 tagp->_ranges[n].dr_flags = flags; 68 } 69 } 70 71 return tagp; 72 } 73