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NetBSD/sys/arch/next68k/dev/nextdma.c
tv 650553215e %b -> bitmask_snprintf()
2000-08-09 02:26:26 +00:00

669 lines
19 KiB
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/* $NetBSD: nextdma.c,v 1.22 2000/08/09 02:26:26 tv Exp $ */
/*
* Copyright (c) 1998 Darrin B. Jewell
* 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.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Darrin B. Jewell
* 4. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 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.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/mbuf.h>
#include <sys/syslog.h>
#include <sys/socket.h>
#include <sys/device.h>
#include <sys/malloc.h>
#include <sys/ioctl.h>
#include <sys/errno.h>
#include <machine/autoconf.h>
#include <machine/cpu.h>
#include <machine/intr.h>
#include <m68k/cacheops.h>
#include <next68k/next68k/isr.h>
#define _NEXT68K_BUS_DMA_PRIVATE
#include <machine/bus.h>
#include "nextdmareg.h"
#include "nextdmavar.h"
#if 1
#define ND_DEBUG
#endif
#if defined(ND_DEBUG)
int nextdma_debug = 0;
#define DPRINTF(x) if (nextdma_debug) printf x;
#else
#define DPRINTF(x)
#endif
void next_dmamap_sync __P((bus_dma_tag_t, bus_dmamap_t, bus_addr_t,
bus_size_t, int));
int next_dma_continue __P((struct nextdma_config *));
void next_dma_rotate __P((struct nextdma_config *));
void next_dma_setup_cont_regs __P((struct nextdma_config *));
void next_dma_setup_curr_regs __P((struct nextdma_config *));
void next_dma_finish_xfer __P((struct nextdma_config *));
void
nextdma_config(nd)
struct nextdma_config *nd;
{
/* Initialize the dma_tag. As a hack, we currently
* put the dma tag in the structure itself. It shouldn't be there.
*/
{
bus_dma_tag_t t;
t = &nd->_nd_dmat;
t->_cookie = nd;
t->_dmamap_create = _bus_dmamap_create;
t->_dmamap_destroy = _bus_dmamap_destroy;
t->_dmamap_load = _bus_dmamap_load_direct;
t->_dmamap_load_mbuf = _bus_dmamap_load_mbuf_direct;
t->_dmamap_load_uio = _bus_dmamap_load_uio_direct;
t->_dmamap_load_raw = _bus_dmamap_load_raw_direct;
t->_dmamap_unload = _bus_dmamap_unload;
t->_dmamap_sync = _bus_dmamap_sync;
t->_dmamem_alloc = _bus_dmamem_alloc;
t->_dmamem_free = _bus_dmamem_free;
t->_dmamem_map = _bus_dmamem_map;
t->_dmamem_unmap = _bus_dmamem_unmap;
t->_dmamem_mmap = _bus_dmamem_mmap;
nd->nd_dmat = t;
}
nextdma_init(nd);
isrlink_autovec(nextdma_intr, nd, NEXT_I_IPL(nd->nd_intr), 10);
INTR_ENABLE(nd->nd_intr);
}
void
nextdma_init(nd)
struct nextdma_config *nd;
{
#ifdef ND_DEBUG
if (nextdma_debug) {
char sbuf[256];
bitmask_snprintf(NEXT_I_BIT(nd->nd_intr), NEXT_INTR_BITS,
sbuf, sizeof(sbuf));
printf("DMA init ipl (%ld) intr(0x%s)\n",
NEXT_I_IPL(nd->nd_intr), sbuf);
}
#endif
nd->_nd_map = NULL;
nd->_nd_idx = 0;
nd->_nd_map_cont = NULL;
nd->_nd_idx_cont = 0;
bus_space_write_4(nd->nd_bst, nd->nd_bsh, DD_CSR, 0);
bus_space_write_4(nd->nd_bst, nd->nd_bsh, DD_CSR,
DMACSR_RESET | DMACSR_INITBUF);
next_dma_setup_curr_regs(nd);
next_dma_setup_cont_regs(nd);
#if defined(DIAGNOSTIC)
{
u_long state;
state = bus_space_read_4(nd->nd_bst, nd->nd_bsh, DD_CSR);
#if 1
/* mourning (a 25Mhz 68040 mono slab) appears to set BUSEXC
* milo (a 25Mhz 68040 mono cube) didn't have this problem
* Darrin B. Jewell <jewell@mit.edu> Mon May 25 07:53:05 1998
*/
state &= (DMACSR_COMPLETE | DMACSR_SUPDATE | DMACSR_ENABLE);
#else
state &= (DMACSR_BUSEXC | DMACSR_COMPLETE |
DMACSR_SUPDATE | DMACSR_ENABLE);
#endif
if (state) {
next_dma_print(nd);
panic("DMA did not reset");
}
}
#endif
}
void
nextdma_reset(nd)
struct nextdma_config *nd;
{
int s;
s = spldma();
DPRINTF(("DMA reset\n"));
#if (defined(ND_DEBUG))
if (nextdma_debug) next_dma_print(nd);
#endif
/* @@@ clean up dma maps */
nextdma_init(nd);
splx(s);
}
/****************************************************************/
/* Call the completed and continue callbacks to try to fill
* in the dma continue buffers.
*/
void
next_dma_rotate(nd)
struct nextdma_config *nd;
{
DPRINTF(("DMA next_dma_rotate()\n"));
/* Rotate the continue map into the current map */
nd->_nd_map = nd->_nd_map_cont;
nd->_nd_idx = nd->_nd_idx_cont;
if ((!nd->_nd_map_cont) ||
((nd->_nd_map_cont) &&
(++nd->_nd_idx_cont >= nd->_nd_map_cont->dm_nsegs))) {
if (nd->nd_continue_cb) {
nd->_nd_map_cont = (*nd->nd_continue_cb)(nd->nd_cb_arg);
} else {
nd->_nd_map_cont = 0;
}
nd->_nd_idx_cont = 0;
}
#ifdef DIAGNOSTIC
if (nd->_nd_map) {
nd->_nd_map->dm_segs[nd->_nd_idx].ds_xfer_len = 0x1234beef;
}
#endif
#ifdef DIAGNOSTIC
if (nd->_nd_map_cont) {
if (!DMA_BEGINALIGNED(nd->_nd_map_cont->dm_segs[nd->_nd_idx_cont].ds_addr)) {
next_dma_print(nd);
panic("DMA request unaligned at start\n");
}
if (!DMA_ENDALIGNED(nd->_nd_map_cont->dm_segs[nd->_nd_idx_cont].ds_addr +
nd->_nd_map_cont->dm_segs[nd->_nd_idx_cont].ds_len)) {
next_dma_print(nd);
panic("DMA request unaligned at end\n");
}
}
#endif
}
void
next_dma_setup_cont_regs(nd)
struct nextdma_config *nd;
{
bus_addr_t dd_start;
bus_addr_t dd_stop;
bus_addr_t dd_saved_start;
bus_addr_t dd_saved_stop;
DPRINTF(("DMA next_dma_setup_regs()\n"));
if (nd->_nd_map_cont) {
dd_start = nd->_nd_map_cont->dm_segs[nd->_nd_idx_cont].ds_addr;
dd_stop = (nd->_nd_map_cont->dm_segs[nd->_nd_idx_cont].ds_addr +
nd->_nd_map_cont->dm_segs[nd->_nd_idx_cont].ds_len);
if (nd->nd_intr == NEXT_I_ENETX_DMA) {
dd_stop |= 0x80000000; /* Ethernet transmit needs secret magic */
}
} else {
dd_start = 0xdeadbeef;
dd_stop = 0xdeadbeef;
}
dd_saved_start = dd_start;
dd_saved_stop = dd_stop;
bus_space_write_4(nd->nd_bst, nd->nd_bsh, DD_START, dd_start);
bus_space_write_4(nd->nd_bst, nd->nd_bsh, DD_STOP, dd_stop);
bus_space_write_4(nd->nd_bst, nd->nd_bsh, DD_SAVED_START, dd_saved_start);
bus_space_write_4(nd->nd_bst, nd->nd_bsh, DD_SAVED_STOP, dd_saved_stop);
#ifdef DIAGNOSTIC
if ((bus_space_read_4(nd->nd_bst, nd->nd_bsh, DD_START) != dd_start) ||
(bus_space_read_4(nd->nd_bst, nd->nd_bsh, DD_STOP) != dd_stop) ||
(bus_space_read_4(nd->nd_bst, nd->nd_bsh, DD_SAVED_START) != dd_saved_start) ||
(bus_space_read_4(nd->nd_bst, nd->nd_bsh, DD_SAVED_STOP) != dd_saved_stop)) {
next_dma_print(nd);
panic("DMA failure writing to continue regs");
}
#endif
}
void
next_dma_setup_curr_regs(nd)
struct nextdma_config *nd;
{
bus_addr_t dd_next;
bus_addr_t dd_limit;
bus_addr_t dd_saved_next;
bus_addr_t dd_saved_limit;
DPRINTF(("DMA next_dma_setup_curr_regs()\n"));
if (nd->_nd_map) {
dd_next = nd->_nd_map->dm_segs[nd->_nd_idx].ds_addr;
dd_limit = (nd->_nd_map->dm_segs[nd->_nd_idx].ds_addr +
nd->_nd_map->dm_segs[nd->_nd_idx].ds_len);
if (nd->nd_intr == NEXT_I_ENETX_DMA) {
dd_limit |= 0x80000000; /* Ethernet transmit needs secret magic */
}
} else {
dd_next = 0xdeadbeef;
dd_limit = 0xdeadbeef;
}
dd_saved_next = dd_next;
dd_saved_limit = dd_limit;
if (nd->nd_intr == NEXT_I_ENETX_DMA) {
bus_space_write_4(nd->nd_bst, nd->nd_bsh, DD_NEXT_INITBUF, dd_next);
} else {
bus_space_write_4(nd->nd_bst, nd->nd_bsh, DD_NEXT, dd_next);
}
bus_space_write_4(nd->nd_bst, nd->nd_bsh, DD_LIMIT, dd_limit);
bus_space_write_4(nd->nd_bst, nd->nd_bsh, DD_SAVED_NEXT, dd_saved_next);
bus_space_write_4(nd->nd_bst, nd->nd_bsh, DD_SAVED_LIMIT, dd_saved_limit);
#ifdef DIAGNOSTIC
if ((bus_space_read_4(nd->nd_bst, nd->nd_bsh, DD_NEXT_INITBUF) != dd_next) ||
(bus_space_read_4(nd->nd_bst, nd->nd_bsh, DD_NEXT) != dd_next) ||
(bus_space_read_4(nd->nd_bst, nd->nd_bsh, DD_LIMIT) != dd_limit) ||
(bus_space_read_4(nd->nd_bst, nd->nd_bsh, DD_SAVED_NEXT) != dd_saved_next) ||
(bus_space_read_4(nd->nd_bst, nd->nd_bsh, DD_SAVED_LIMIT) != dd_saved_limit)) {
next_dma_print(nd);
panic("DMA failure writing to current regs");
}
#endif
}
/* This routine is used for debugging */
void
next_dma_print(nd)
struct nextdma_config *nd;
{
u_long dd_csr;
u_long dd_next;
u_long dd_next_initbuf;
u_long dd_limit;
u_long dd_start;
u_long dd_stop;
u_long dd_saved_next;
u_long dd_saved_limit;
u_long dd_saved_start;
u_long dd_saved_stop;
char sbuf[256];
/* Read all of the registers before we print anything out,
* in case something changes
*/
dd_csr = bus_space_read_4(nd->nd_bst, nd->nd_bsh, DD_CSR);
dd_next = bus_space_read_4(nd->nd_bst, nd->nd_bsh, DD_NEXT);
dd_next_initbuf = bus_space_read_4(nd->nd_bst, nd->nd_bsh, DD_NEXT_INITBUF);
dd_limit = bus_space_read_4(nd->nd_bst, nd->nd_bsh, DD_LIMIT);
dd_start = bus_space_read_4(nd->nd_bst, nd->nd_bsh, DD_START);
dd_stop = bus_space_read_4(nd->nd_bst, nd->nd_bsh, DD_STOP);
dd_saved_next = bus_space_read_4(nd->nd_bst, nd->nd_bsh, DD_SAVED_NEXT);
dd_saved_limit = bus_space_read_4(nd->nd_bst, nd->nd_bsh, DD_SAVED_LIMIT);
dd_saved_start = bus_space_read_4(nd->nd_bst, nd->nd_bsh, DD_SAVED_START);
dd_saved_stop = bus_space_read_4(nd->nd_bst, nd->nd_bsh, DD_SAVED_STOP);
bitmask_snprintf((*(volatile u_long *)IIOV(NEXT_P_INTRSTAT)),
NEXT_INTR_BITS, sbuf, sizeof(sbuf));
printf("NDMAP: *intrstat = 0x%s\n", sbuf);
bitmask_snprintf((*(volatile u_long *)IIOV(NEXT_P_INTRMASK)),
NEXT_INTR_BITS, sbuf, sizeof(sbuf));
printf("NDMAP: *intrmask = 0x%s\n", sbuf);
/* NDMAP is Next DMA Print (really!) */
if (nd->_nd_map) {
printf("NDMAP: nd->_nd_map->dm_mapsize = %d\n",
nd->_nd_map->dm_mapsize);
printf("NDMAP: nd->_nd_map->dm_nsegs = %d\n",
nd->_nd_map->dm_nsegs);
printf("NDMAP: nd->_nd_map->dm_segs[%d].ds_addr = 0x%08lx\n",
nd->_nd_idx,nd->_nd_map->dm_segs[nd->_nd_idx].ds_addr);
printf("NDMAP: nd->_nd_map->dm_segs[%d].ds_len = %d\n",
nd->_nd_idx,nd->_nd_map->dm_segs[nd->_nd_idx].ds_len);
printf("NDMAP: nd->_nd_map->dm_segs[%d].ds_xfer_len = %d\n",
nd->_nd_idx,nd->_nd_map->dm_segs[nd->_nd_idx].ds_xfer_len);
} else {
printf("NDMAP: nd->_nd_map = NULL\n");
}
if (nd->_nd_map_cont) {
printf("NDMAP: nd->_nd_map_cont->dm_mapsize = %d\n",
nd->_nd_map_cont->dm_mapsize);
printf("NDMAP: nd->_nd_map_cont->dm_nsegs = %d\n",
nd->_nd_map_cont->dm_nsegs);
printf("NDMAP: nd->_nd_map_cont->dm_segs[%d].ds_addr = 0x%08lx\n",
nd->_nd_idx_cont,nd->_nd_map_cont->dm_segs[nd->_nd_idx_cont].ds_addr);
printf("NDMAP: nd->_nd_map_cont->dm_segs[%d].ds_len = %d\n",
nd->_nd_idx_cont,nd->_nd_map_cont->dm_segs[nd->_nd_idx_cont].ds_len);
printf("NDMAP: nd->_nd_map_cont->dm_segs[%d].ds_xfer_len = %d\n",
nd->_nd_idx_cont,nd->_nd_map_cont->dm_segs[nd->_nd_idx_cont].ds_xfer_len);
} else {
printf("NDMAP: nd->_nd_map_cont = NULL\n");
}
bitmask_snprintf(dd_csr, DMACSR_BITS, sbuf, sizeof(sbuf));
printf("NDMAP: dd->dd_csr = 0x%s\n", sbuf);
printf("NDMAP: dd->dd_saved_next = 0x%08x\n", dd_saved_next);
printf("NDMAP: dd->dd_saved_limit = 0x%08x\n", dd_saved_limit);
printf("NDMAP: dd->dd_saved_start = 0x%08x\n", dd_saved_start);
printf("NDMAP: dd->dd_saved_stop = 0x%08x\n", dd_saved_stop);
printf("NDMAP: dd->dd_next = 0x%08x\n", dd_next);
printf("NDMAP: dd->dd_next_initbuf = 0x%08x\n", dd_next_initbuf);
printf("NDMAP: dd->dd_limit = 0x%08x\n", dd_limit);
printf("NDMAP: dd->dd_start = 0x%08x\n", dd_start);
printf("NDMAP: dd->dd_stop = 0x%08x\n", dd_stop);
bitmask_snprintf(NEXT_I_BIT(nd->nd_intr), NEXT_INTR_BITS,
sbuf, sizeof(sbuf));
printf("NDMAP: interrupt ipl (%ld) intr(0x%s)\n",
NEXT_I_IPL(nd->nd_intr), sbuf);
}
/****************************************************************/
void
next_dma_finish_xfer(nd)
struct nextdma_config *nd;
{
bus_addr_t onext;
bus_addr_t olimit;
bus_addr_t slimit;
onext = nd->_nd_map->dm_segs[nd->_nd_idx].ds_addr;
olimit = onext + nd->_nd_map->dm_segs[nd->_nd_idx].ds_len;
if ((nd->_nd_map_cont == NULL) && (nd->_nd_idx+1 == nd->_nd_map->dm_nsegs)) {
slimit = bus_space_read_4(nd->nd_bst, nd->nd_bsh, DD_LIMIT);
} else {
slimit = bus_space_read_4(nd->nd_bst, nd->nd_bsh, DD_SAVED_LIMIT);
}
if (nd->nd_intr == NEXT_I_ENETX_DMA) {
slimit &= ~0x80000000;
}
#ifdef DIAGNOSTIC
if ((slimit < onext) || (slimit > olimit)) {
next_dma_print(nd);
panic("DMA: Unexpected registers in finish_xfer\n");
}
#endif
nd->_nd_map->dm_segs[nd->_nd_idx].ds_xfer_len = slimit-onext;
/* If we've reached the end of the current map, then inform
* that we've completed that map.
*/
if (nd->_nd_map && ((nd->_nd_idx+1) == nd->_nd_map->dm_nsegs)) {
if (nd->nd_completed_cb)
(*nd->nd_completed_cb)(nd->_nd_map, nd->nd_cb_arg);
}
nd->_nd_map = 0;
nd->_nd_idx = 0;
}
int
nextdma_intr(arg)
void *arg;
{
/* @@@ This is bogus, we can't be certain of arg's type
* unless the interrupt is for us. For now we successfully
* cheat because DMA interrupts are the only things invoked
* at this interrupt level.
*/
struct nextdma_config *nd = arg;
if (!INTR_OCCURRED(nd->nd_intr)) return 0;
/* Handle dma interrupts */
#ifdef ND_DEBUG
if (nextdma_debug) {
char sbuf[256];
bitmask_snprintf(NEXT_I_BIT(nd->nd_intr), NEXT_INTR_BITS,
sbuf, sizeof(sbuf));
printf("DMA interrupt ipl (%ld) intr(0x%s)\n",
NEXT_I_IPL(nd->nd_intr), sbuf);
}
#endif
#ifdef DIAGNOSTIC
if (!nd->_nd_map) {
next_dma_print(nd);
panic("DMA missing current map in interrupt!\n");
}
#endif
{
int state = bus_space_read_4(nd->nd_bst, nd->nd_bsh, DD_CSR);
#ifdef DIAGNOSTIC
if ((!(state & DMACSR_COMPLETE)) || (state & DMACSR_SUPDATE)) {
char sbuf[256];
next_dma_print(nd);
bitmask_snprintf(state, DMACSR_BITS, sbuf, sizeof(sbuf));
panic("DMA Unexpected dma state in interrupt (0x%s)", sbuf);
}
#endif
next_dma_finish_xfer(nd);
/* Check to see if we are expecting dma to shut down */
if ((nd->_nd_map == NULL) && (nd->_nd_map_cont == NULL)) {
#ifdef DIAGNOSTIC
if (state & DMACSR_ENABLE) {
char sbuf[256];
next_dma_print(nd);
bitmask_snprintf(state, DMACSR_BITS, sbuf, sizeof(sbuf));
panic("DMA: unexpected DMA state at shutdown (0x%s)\n", sbuf);
}
#endif
bus_space_write_4(nd->nd_bst, nd->nd_bsh, DD_CSR,
DMACSR_CLRCOMPLETE | DMACSR_RESET);
DPRINTF(("DMA: a normal and expected shutdown occurred\n"));
if (nd->nd_shutdown_cb) (*nd->nd_shutdown_cb)(nd->nd_cb_arg);
return(1);
}
next_dma_rotate(nd);
next_dma_setup_cont_regs(nd);
{
u_long dmadir; /* DMACSR_SETREAD or DMACSR_SETWRITE */
if (state & DMACSR_READ) {
dmadir = DMACSR_SETREAD;
} else {
dmadir = DMACSR_SETWRITE;
}
/* we used to SETENABLE here only
conditionally, but we got burned
because DMA sometimes would shut
down between when we checked and
when we acted upon it. CL19991211 */
if ((nd->_nd_map_cont == NULL) && (nd->_nd_idx+1 == nd->_nd_map->dm_nsegs)) {
bus_space_write_4(nd->nd_bst, nd->nd_bsh, DD_CSR,
DMACSR_CLRCOMPLETE | dmadir | DMACSR_SETENABLE);
} else {
bus_space_write_4(nd->nd_bst, nd->nd_bsh, DD_CSR,
DMACSR_CLRCOMPLETE | dmadir | DMACSR_SETSUPDATE | DMACSR_SETENABLE);
}
}
}
#ifdef ND_DEBUG
if (nextdma_debug) {
char sbuf[256];
bitmask_snprintf(NEXT_I_BIT(nd->nd_intr), NEXT_INTR_BITS,
sbuf, sizeof(sbuf));
printf("DMA exiting interrupt ipl (%ld) intr(0x%s)\n",
NEXT_I_IPL(nd->nd_intr), sbuf);
}
#endif
return(1);
}
/*
* Check to see if dma has finished for a channel */
int
nextdma_finished(nd)
struct nextdma_config *nd;
{
int r;
int s;
s = spldma(); /* @@@ should this be splimp()? */
r = (nd->_nd_map == NULL) && (nd->_nd_map_cont == NULL);
splx(s);
return(r);
}
void
nextdma_start(nd, dmadir)
struct nextdma_config *nd;
u_long dmadir; /* DMACSR_SETREAD or DMACSR_SETWRITE */
{
#ifdef DIAGNOSTIC
if (!nextdma_finished(nd)) {
char sbuf[256];
bitmask_snprintf(NEXT_I_BIT(nd->nd_intr), NEXT_INTR_BITS,
sbuf, sizeof(sbuf));
panic("DMA trying to start before previous finished on intr(0x%s)\n", sbuf);
}
#endif
#ifdef ND_DEBUG
if (nextdma_debug) {
char sbuf[256];
bitmask_snprintf(NEXT_I_BIT(nd->nd_intr), NEXT_INTR_BITS,
sbuf, sizeof(sbuf));
printf("DMA start (%ld) intr(0x%s)\n",
NEXT_I_IPL(nd->nd_intr), sbuf);
}
#endif
#ifdef DIAGNOSTIC
if (nd->_nd_map) {
next_dma_print(nd);
panic("DMA: nextdma_start() with non null map\n");
}
if (nd->_nd_map_cont) {
next_dma_print(nd);
panic("DMA: nextdma_start() with non null continue map\n");
}
#endif
#ifdef DIAGNOSTIC
if ((dmadir != DMACSR_SETREAD) && (dmadir != DMACSR_SETWRITE)) {
panic("DMA: nextdma_start(), dmadir arg must be DMACSR_SETREAD or DMACSR_SETWRITE\n");
}
#endif
/* preload both the current and the continue maps */
next_dma_rotate(nd);
#ifdef DIAGNOSTIC
if (!nd->_nd_map_cont) {
panic("No map available in nextdma_start()");
}
#endif
next_dma_rotate(nd);
#ifdef ND_DEBUG
if (nextdma_debug) {
char sbuf[256];
bitmask_snprintf(NEXT_I_BIT(nd->nd_intr), NEXT_INTR_BITS,
sbuf, sizeof(sbuf));
printf("DMA initiating DMA %s of %d segments on intr(0x%s)\n",
(dmadir == DMACSR_SETREAD ? "read" : "write"), nd->_nd_map->dm_nsegs, sbuf);
}
#endif
bus_space_write_4(nd->nd_bst, nd->nd_bsh, DD_CSR, 0);
bus_space_write_4(nd->nd_bst, nd->nd_bsh, DD_CSR,
DMACSR_INITBUF | DMACSR_RESET | dmadir);
next_dma_setup_curr_regs(nd);
next_dma_setup_cont_regs(nd);
#if (defined(ND_DEBUG))
if (nextdma_debug) next_dma_print(nd);
#endif
if ((nd->_nd_map_cont == NULL) && (nd->_nd_idx+1 == nd->_nd_map->dm_nsegs)) {
bus_space_write_4(nd->nd_bst, nd->nd_bsh, DD_CSR,
DMACSR_SETENABLE | dmadir);
} else {
bus_space_write_4(nd->nd_bst, nd->nd_bsh, DD_CSR,
DMACSR_SETSUPDATE | DMACSR_SETENABLE | dmadir);
}
}
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