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
100 lines
2.8 KiB
C
100 lines
2.8 KiB
C
/*-
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* Copyright (c) 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/malloc.h>
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#include <sys/sx.h>
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#include <machine/bus.h>
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#include <dev/xdma/xdma.h>
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void
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xchan_bank_init(xdma_channel_t *xchan)
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{
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struct xdma_request *xr;
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xdma_controller_t *xdma;
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int i;
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xdma = xchan->xdma;
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KASSERT(xdma != NULL, ("xdma is NULL"));
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xchan->xr_mem = malloc(sizeof(struct xdma_request) * xchan->xr_num,
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M_XDMA, M_WAITOK | M_ZERO);
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for (i = 0; i < xchan->xr_num; i++) {
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xr = &xchan->xr_mem[i];
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TAILQ_INSERT_TAIL(&xchan->bank, xr, xr_next);
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}
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}
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int
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xchan_bank_free(xdma_channel_t *xchan)
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{
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free(xchan->xr_mem, M_XDMA);
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return (0);
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}
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struct xdma_request *
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xchan_bank_get(xdma_channel_t *xchan)
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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_BANK_LOCK(xchan);
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TAILQ_FOREACH_SAFE(xr, &xchan->bank, xr_next, xr_tmp) {
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TAILQ_REMOVE(&xchan->bank, xr, xr_next);
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break;
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}
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QUEUE_BANK_UNLOCK(xchan);
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return (xr);
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}
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int
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xchan_bank_put(xdma_channel_t *xchan, struct xdma_request *xr)
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{
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QUEUE_BANK_LOCK(xchan);
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TAILQ_INSERT_TAIL(&xchan->bank, xr, xr_next);
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QUEUE_BANK_UNLOCK(xchan);
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return (0);
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}
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