1 /*- 2 * Copyright (c) 2017-2018 Ruslan Bukin <br@bsdpad.com> 3 * All rights reserved. 4 * 5 * This software was developed by SRI International and the University of 6 * Cambridge Computer Laboratory under DARPA/AFRL contract FA8750-10-C-0237 7 * ("CTSRD"), as part of the DARPA CRASH research programme. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 */ 30 31 #include <sys/cdefs.h> 32 __FBSDID("$FreeBSD$"); 33 34 #include "opt_platform.h" 35 #include <sys/param.h> 36 #include <sys/conf.h> 37 #include <sys/bus.h> 38 #include <sys/kernel.h> 39 #include <sys/malloc.h> 40 41 #include <machine/bus.h> 42 43 #include <dev/xdma/xdma.h> 44 45 int 46 xchan_sglist_alloc(xdma_channel_t *xchan) 47 { 48 uint32_t sz; 49 50 if (xchan->flags & XCHAN_SGLIST_ALLOCATED) 51 return (-1); 52 53 sz = (sizeof(struct xdma_sglist) * XDMA_SGLIST_MAXLEN); 54 xchan->sg = malloc(sz, M_XDMA, M_WAITOK | M_ZERO); 55 xchan->flags |= XCHAN_SGLIST_ALLOCATED; 56 57 return (0); 58 } 59 60 void 61 xchan_sglist_free(xdma_channel_t *xchan) 62 { 63 64 if (xchan->flags & XCHAN_SGLIST_ALLOCATED) 65 free(xchan->sg, M_XDMA); 66 67 xchan->flags &= ~XCHAN_SGLIST_ALLOCATED; 68 } 69 70 int 71 xdma_sglist_add(struct xdma_sglist *sg, struct bus_dma_segment *seg, 72 uint32_t nsegs, struct xdma_request *xr) 73 { 74 int i; 75 76 if (nsegs == 0) 77 return (-1); 78 79 for (i = 0; i < nsegs; i++) { 80 sg[i].src_width = xr->src_width; 81 sg[i].dst_width = xr->dst_width; 82 83 if (xr->direction == XDMA_MEM_TO_DEV) { 84 sg[i].src_addr = seg[i].ds_addr; 85 sg[i].dst_addr = xr->dst_addr; 86 } else { 87 sg[i].src_addr = xr->src_addr; 88 sg[i].dst_addr = seg[i].ds_addr; 89 } 90 sg[i].len = seg[i].ds_len; 91 sg[i].direction = xr->direction; 92 93 sg[i].first = 0; 94 sg[i].last = 0; 95 } 96 97 sg[0].first = 1; 98 sg[nsegs - 1].last = 1; 99 100 return (0); 101 } 102