128 lines
3.7 KiB
C
128 lines
3.7 KiB
C
/* $NetBSD: atppc_isadma.c,v 1.8 2022/09/25 17:09:36 thorpej Exp $ */
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/*-
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* Copyright (c) 2001 Alcove - Nicolas Souchu
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* All rights reserved.
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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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* FreeBSD: src/sys/isa/ppc.c,v 1.26.2.5 2001/10/02 05:21:45 nsouch Exp
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*
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: atppc_isadma.c,v 1.8 2022/09/25 17:09:36 thorpej Exp $");
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#include "opt_atppc.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/device.h>
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#include <sys/intr.h>
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#include <sys/bus.h>
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#include <dev/ic/atppcreg.h>
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#include <dev/ic/atppcvar.h>
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#include <dev/isa/isadmavar.h>
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#include <dev/isa/isareg.h>
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#include <dev/isa/isavar.h>
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#include <dev/isa/atppc_isadma.h>
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/* Enable DMA */
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int
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atppc_isadma_setup(struct atppc_softc * lsc, isa_chipset_tag_t ic, int drq)
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{
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int error = 1;
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/* Reserve DRQ */
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if (isa_drq_alloc(ic, drq)) {
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ATPPC_DPRINTF(("%s(%s): cannot reserve DRQ line.\n", __func__,
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device_xname(lsc->sc_dev)));
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return error;
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}
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/* Get maximum DMA size for isa bus */
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lsc->sc_dma_maxsize = isa_dmamaxsize(ic, drq);
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/* Create dma mapping */
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error = isa_dmamap_create(ic, drq, lsc->sc_dma_maxsize,
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BUS_DMA_NOWAIT|BUS_DMA_ALLOCNOW);
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return error;
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}
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/* Start DMA operation over ISA bus */
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int
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atppc_isadma_start(isa_chipset_tag_t ic, int drq, void *buf, u_int nbytes,
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u_int8_t mode)
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{
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return (isa_dmastart(ic, drq, buf, nbytes, NULL,
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((mode == ATPPC_DMA_MODE_WRITE) ? DMAMODE_WRITE :
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DMAMODE_READ) | DMAMODE_DEMAND, ((mode == ATPPC_DMA_MODE_WRITE)
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? BUS_DMA_WRITE : BUS_DMA_READ) | BUS_DMA_NOWAIT));
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}
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/* Stop DMA operation over ISA bus */
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int
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atppc_isadma_finish(isa_chipset_tag_t ic, int drq)
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{
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isa_dmadone(ic, drq);
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return 0;
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}
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/* Abort DMA operation over ISA bus */
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int
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atppc_isadma_abort(isa_chipset_tag_t ic, int drq)
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{
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isa_dmaabort(ic, drq);
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return 0;
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}
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/* Allocate memory for DMA over ISA bus */
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int
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atppc_isadma_malloc(isa_chipset_tag_t ic, int drq, void **buf, bus_addr_t *bus_addr, bus_size_t size)
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{
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int error;
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error = isa_dmamem_alloc(ic, drq, size, bus_addr, BUS_DMA_WAITOK);
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if (error)
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return error;
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error = isa_dmamem_map(ic, drq, *bus_addr, size, buf, BUS_DMA_WAITOK);
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if (error)
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isa_dmamem_free(ic, drq, *bus_addr, size);
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return error;
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}
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/* Free memory allocated by atppc_isadma_malloc() */
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void
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atppc_isadma_free(isa_chipset_tag_t ic, int drq, void ** buf, bus_addr_t * bus_addr, bus_size_t size)
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{
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isa_dmamem_unmap(ic, drq, *buf, size);
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isa_dmamem_free(ic, drq, *bus_addr, size);
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}
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