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/* $OpenBSD: dbdma.c,v 1.9 2007/09/17 01:33:33 krw Exp $ */
/* $NetBSD: dbdma.c,v 1.2 1998/08/21 16:13:28 tsubai Exp $ */
/*
* Copyright 1991-1998 by Open Software Foundation, Inc.
* All Rights Reserved
*
* Permission to use, copy, modify, and distribute this software and
* its documentation for any purpose and without fee is hereby granted,
* provided that the above copyright notice appears in all copies and
* that both the copyright notice and this permission notice appear in
* supporting documentation.
*
* OSF DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE
* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE.
*
* IN NO EVENT SHALL OSF BE LIABLE FOR ANY SPECIAL, INDIRECT, OR
* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
* LOSS OF USE, DATA OR PROFITS, WHETHER IN ACTION OF CONTRACT,
* NEGLIGENCE, OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
* WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
*/
#include <sys/param.h>
#include <sys/malloc.h>
#include <sys/systm.h>
#include <uvm/uvm_extern.h>
#include <machine/bus.h>
#include <macppc/dev/dbdma.h>
dbdma_command_t *dbdma_alloc_commands = NULL;
void
dbdma_start(dbdma_regmap_t *dmap, dbdma_t dt)
{
u_int32_t addr = dt->d_paddr;
DBDMA_ST4_ENDIAN(&dmap->d_intselect, DBDMA_CLEAR_CNTRL((0xffff)));
DBDMA_ST4_ENDIAN(&dmap->d_control, DBDMA_CLEAR_CNTRL((
DBDMA_CNTRL_ACTIVE |
DBDMA_CNTRL_DEAD |
DBDMA_CNTRL_WAKE |
DBDMA_CNTRL_FLUSH |
DBDMA_CNTRL_PAUSE |
DBDMA_CNTRL_RUN)));
/* XXX time-bind it? */
do {
delay(10);
} while (DBDMA_LD4_ENDIAN(&dmap->d_status) & DBDMA_CNTRL_ACTIVE);
DBDMA_ST4_ENDIAN(&dmap->d_cmdptrhi, 0); /* 64-bit not yet */
DBDMA_ST4_ENDIAN(&dmap->d_cmdptrlo, addr);
DBDMA_ST4_ENDIAN(&dmap->d_control,
DBDMA_SET_CNTRL(DBDMA_CNTRL_RUN|DBDMA_CNTRL_WAKE)|
DBDMA_CLEAR_CNTRL(DBDMA_CNTRL_PAUSE|DBDMA_CNTRL_DEAD) );
}
void
dbdma_stop(dbdma_regmap_t *dmap)
{
DBDMA_ST4_ENDIAN(&dmap->d_control, DBDMA_CLEAR_CNTRL(DBDMA_CNTRL_RUN) |
DBDMA_SET_CNTRL(DBDMA_CNTRL_FLUSH));
while (DBDMA_LD4_ENDIAN(&dmap->d_status) &
(DBDMA_CNTRL_ACTIVE|DBDMA_CNTRL_FLUSH));
}
void
dbdma_flush(dbdma_regmap_t *dmap)
{
DBDMA_ST4_ENDIAN(&dmap->d_control, DBDMA_SET_CNTRL(DBDMA_CNTRL_FLUSH));
/* XXX time-bind it? */
while (DBDMA_LD4_ENDIAN(&dmap->d_status) & (DBDMA_CNTRL_FLUSH));
}
void
dbdma_reset(dbdma_regmap_t *dmap)
{
DBDMA_ST4_ENDIAN(&dmap->d_control,
DBDMA_CLEAR_CNTRL( (DBDMA_CNTRL_ACTIVE |
DBDMA_CNTRL_DEAD |
DBDMA_CNTRL_WAKE |
DBDMA_CNTRL_FLUSH |
DBDMA_CNTRL_PAUSE |
DBDMA_CNTRL_RUN )));
/* XXX time-bind it? */
while (DBDMA_LD4_ENDIAN(&dmap->d_status) & DBDMA_CNTRL_RUN);
}
void
dbdma_continue(dbdma_regmap_t *dmap)
{
DBDMA_ST4_ENDIAN(&dmap->d_control,
DBDMA_SET_CNTRL(DBDMA_CNTRL_RUN | DBDMA_CNTRL_WAKE) |
DBDMA_CLEAR_CNTRL(DBDMA_CNTRL_PAUSE | DBDMA_CNTRL_DEAD));
}
void
dbdma_pause(dbdma_regmap_t *dmap)
{
DBDMA_ST4_ENDIAN(&dmap->d_control,DBDMA_SET_CNTRL(DBDMA_CNTRL_PAUSE));
/* XXX time-bind it? */
while (DBDMA_LD4_ENDIAN(&dmap->d_status) & DBDMA_CNTRL_ACTIVE);
}
dbdma_t
dbdma_alloc(bus_dma_tag_t dmat, int size)
{
dbdma_t dt;
int error;
dt = malloc(sizeof *dt, M_DEVBUF, M_NOWAIT | M_ZERO);
if (!dt)
return (dt);
dt->d_size = size *= sizeof(dbdma_command_t);
dt->d_dmat = dmat;
if ((error = bus_dmamem_alloc(dmat, size, NBPG, 0, dt->d_segs,
1, &dt->d_nsegs, BUS_DMA_NOWAIT)) != 0) {
printf("dbdma: unable to allocate dma, error = %d\n", error);
} else if ((error = bus_dmamem_map(dmat, dt->d_segs, dt->d_nsegs, size,
(caddr_t *)&dt->d_addr, BUS_DMA_NOWAIT | BUS_DMA_COHERENT)) != 0) {
printf("dbdma: unable to map dma, error = %d\n", error);
} else if ((error = bus_dmamap_create(dmat, dt->d_size, 1,
dt->d_size, 0, BUS_DMA_NOWAIT, &dt->d_map)) != 0) {
printf("dbdma: unable to create dma map, error = %d\n", error);
} else if ((error = bus_dmamap_load_raw(dmat, dt->d_map,
dt->d_segs, dt->d_nsegs, size, BUS_DMA_NOWAIT)) != 0) {
printf("dbdma: unable to load dma map, error = %d\n", error);
} else
return dt;
dbdma_free(dt);
return (NULL);
}
void
dbdma_free(dbdma_t dt)
{
if (dt->d_map)
bus_dmamap_destroy(dt->d_dmat, dt->d_map);
if (dt->d_addr)
bus_dmamem_unmap(dt->d_dmat, (caddr_t)dt->d_addr, dt->d_size);
if (dt->d_nsegs)
bus_dmamem_free(dt->d_dmat, dt->d_segs, dt->d_nsegs);
free(dt, M_DEVBUF);
}
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