3d5b3b0a44
o Move descriptors allocation to DMA engine driver o Add generic xdma_request() routine o Add less-generic scatter-gather application based on xdma interface Typical operation flow in peripheral device driver is: 1. Get xDMA controller sc->xdma_tx = xdma_ofw_get(sc->dev, "tx"); 2. Allocate virtual channel sc->xchan_tx = xdma_channel_alloc(sc->xdma_tx, caps); 3. Setup transfer status callback xdma_setup_intr(sc->xchan_tx, my_tx_intr, sc, &sc->ih_tx); 4. Request a transfer(s) ret = xdma_request(sc->xchan_tx, &req); 5. Free the channel xdma_channel_free(sc->xdma_tx); 6. Free the controller xdma_put(sc->xdma_tx); Sponsored by: DARPA, AFRL Differential Revision: https://reviews.freebsd.org/D14971
155 lines
3.8 KiB
C
155 lines
3.8 KiB
C
/*-
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* Copyright (c) 2017-2018 Ruslan Bukin <br@bsdpad.com>
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* All rights reserved.
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*
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* This software was developed by SRI International and the University of
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* Cambridge Computer Laboratory under DARPA/AFRL contract FA8750-10-C-0237
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* ("CTSRD"), as part of the DARPA CRASH research programme.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "opt_platform.h"
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#include <sys/param.h>
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#include <sys/conf.h>
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#include <sys/bus.h>
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#include <sys/kernel.h>
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#include <sys/sx.h>
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#include <sys/mbuf.h>
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#include <machine/bus.h>
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#ifdef FDT
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#include <dev/fdt/fdt_common.h>
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#include <dev/ofw/ofw_bus.h>
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#include <dev/ofw/ofw_bus_subr.h>
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#endif
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#include <dev/xdma/xdma.h>
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int
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xdma_dequeue_mbuf(xdma_channel_t *xchan, struct mbuf **mp,
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xdma_transfer_status_t *status)
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{
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struct xdma_request *xr;
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struct xdma_request *xr_tmp;
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QUEUE_OUT_LOCK(xchan);
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TAILQ_FOREACH_SAFE(xr, &xchan->queue_out, xr_next, xr_tmp) {
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TAILQ_REMOVE(&xchan->queue_out, xr, xr_next);
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break;
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}
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QUEUE_OUT_UNLOCK(xchan);
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if (xr == NULL)
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return (-1);
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*mp = xr->m;
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status->error = xr->status.error;
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status->transferred = xr->status.transferred;
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xchan_bank_put(xchan, xr);
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return (0);
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}
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int
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xdma_enqueue_mbuf(xdma_channel_t *xchan, struct mbuf **mp,
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uintptr_t addr, uint8_t src_width, uint8_t dst_width,
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enum xdma_direction dir)
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{
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struct xdma_request *xr;
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xdma_controller_t *xdma;
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xdma = xchan->xdma;
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xr = xchan_bank_get(xchan);
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if (xr == NULL)
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return (-1); /* No space is available yet. */
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xr->direction = dir;
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xr->m = *mp;
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xr->req_type = XR_TYPE_MBUF;
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if (dir == XDMA_MEM_TO_DEV) {
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xr->dst_addr = addr;
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xr->src_addr = 0;
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} else {
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xr->src_addr = addr;
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xr->dst_addr = 0;
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}
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xr->src_width = src_width;
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xr->dst_width = dst_width;
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QUEUE_IN_LOCK(xchan);
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TAILQ_INSERT_TAIL(&xchan->queue_in, xr, xr_next);
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QUEUE_IN_UNLOCK(xchan);
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return (0);
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}
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uint32_t
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xdma_mbuf_chain_count(struct mbuf *m0)
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{
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struct mbuf *m;
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uint32_t c;
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c = 0;
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for (m = m0; m != NULL; m = m->m_next)
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c++;
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return (c);
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}
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uint32_t
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xdma_mbuf_defrag(xdma_channel_t *xchan, struct xdma_request *xr)
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{
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xdma_controller_t *xdma;
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struct mbuf *m;
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uint32_t c;
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xdma = xchan->xdma;
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c = xdma_mbuf_chain_count(xr->m);
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if (c == 1)
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return (c); /* Nothing to do. */
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if (xchan->caps & XCHAN_CAP_BUSDMA) {
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if ((xchan->caps & XCHAN_CAP_BUSDMA_NOSEG) || \
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(c > xchan->maxnsegs)) {
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if ((m = m_defrag(xr->m, M_NOWAIT)) == NULL) {
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device_printf(xdma->dma_dev,
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"%s: Can't defrag mbuf\n",
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__func__);
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return (c);
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}
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xr->m = m;
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c = 1;
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}
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}
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return (c);
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}
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