xdma_sglist.c

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    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 }

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FreeBSD/Linux Kernel Cross Reference sys/dev/xdma/xdma_sglist.c

FreeBSD/Linux Kernel Cross Reference
sys/dev/xdma/xdma_sglist.c