NetBSD/sys/dev/isa/atppc_isadma.c

129 lines
3.7 KiB
C

/* $NetBSD: atppc_isadma.c,v 1.3 2005/12/11 12:22:02 christos Exp $ */
/*-
* Copyright (c) 2001 Alcove - Nicolas Souchu
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* FreeBSD: src/sys/isa/ppc.c,v 1.26.2.5 2001/10/02 05:21:45 nsouch Exp
*
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: atppc_isadma.c,v 1.3 2005/12/11 12:22:02 christos Exp $");
#include "opt_atppc.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/device.h>
#include <machine/intr.h>
#include <machine/bus.h>
#include <dev/ic/atppcreg.h>
#include <dev/ic/atppcvar.h>
#include <dev/isa/isadmavar.h>
#include <dev/isa/isareg.h>
#include <dev/isa/isavar.h>
#include <dev/isa/atppc_isadma.h>
/* Enable DMA */
int
atppc_isadma_setup(struct atppc_softc * lsc, isa_chipset_tag_t ic, int drq)
{
int error = 1;
/* Reserve DRQ */
if (isa_drq_alloc(ic, drq)) {
ATPPC_DPRINTF(("%s(%s): cannot reserve DRQ line.\n", __func__,
lsc->sc_dev.dv_xname));
return error;
}
/* Get maximum DMA size for isa bus */
lsc->sc_dma_maxsize = isa_dmamaxsize(ic, drq);
/* Create dma mapping */
error = isa_dmamap_create(ic, drq, lsc->sc_dma_maxsize,
BUS_DMA_NOWAIT|BUS_DMA_ALLOCNOW);
return error;
}
/* Start DMA operation over ISA bus */
int
atppc_isadma_start(isa_chipset_tag_t ic, int drq, void * buf, u_int nbytes,
u_int8_t mode)
{
return (isa_dmastart(ic, drq, buf, nbytes, NULL,
((mode == ATPPC_DMA_MODE_WRITE) ? DMAMODE_WRITE :
DMAMODE_READ) | DMAMODE_DEMAND, ((mode == ATPPC_DMA_MODE_WRITE)
? BUS_DMA_WRITE : BUS_DMA_READ) | BUS_DMA_NOWAIT));
}
/* Stop DMA operation over ISA bus */
int
atppc_isadma_finish(isa_chipset_tag_t ic, int drq)
{
isa_dmadone(ic, drq);
return 0;
}
/* Abort DMA operation over ISA bus */
int
atppc_isadma_abort(isa_chipset_tag_t ic, int drq)
{
isa_dmaabort(ic, drq);
return 0;
}
/* Allocate memory for DMA over ISA bus */
int
atppc_isadma_malloc(isa_chipset_tag_t ic, int drq, caddr_t *buf, bus_addr_t *bus_addr, bus_size_t size)
{
int error;
error = isa_dmamem_alloc(ic, drq, size, bus_addr, BUS_DMA_WAITOK);
if (error)
return error;
error = isa_dmamem_map(ic, drq, *bus_addr, size, buf, BUS_DMA_WAITOK);
if (error)
isa_dmamem_free(ic, drq, *bus_addr, size);
return error;
}
/* Free memory allocated by atppc_isadma_malloc() */
void
atppc_isadma_free(isa_chipset_tag_t ic, int drq, caddr_t * buf, bus_addr_t * bus_addr, bus_size_t size)
{
isa_dmamem_unmap(ic, drq, *buf, size);
isa_dmamem_free(ic, drq, *bus_addr, size);
}