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Modification to the previous:

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We still have to preload the command, when selecting without ATN.  (We could
probably avoid this by being more careful in the interrupt handler...)
This commit is contained in:
mycroft 1999-11-10 05:02:53 +00:00
parent 58fec0d55a
commit f8934aa2f6
1 changed files with 31 additions and 5 deletions
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34
sys/dev/ic/ncr53c9x.c
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@ -1,4 +1,4 @@
/* $NetBSD: ncr53c9x.c,v 1.38 1999/11/10 04:21:30 mycroft Exp $ */
/* $NetBSD: ncr53c9x.c,v 1.39 1999/11/10 05:02:53 mycroft Exp $ */
/*-
* Copyright (c) 1998 The NetBSD Foundation, Inc.
@ -493,6 +493,7 @@ ncr53c9x_select(sc, ecb)
int tiflags = ti->flags;
u_char *cmd;
int clen;
size_t dmasize;
NCR_TRACE(("[ncr53c9x_select(t%d,l%d,cmd:%x)] ",
target, lun, ecb->cmd.cmd.opcode));
@ -521,17 +522,42 @@ ncr53c9x_select(sc, ecb)
* otherwise mangle the target. There should be no MESSAGE IN
* phase.
*/
if (ncr53c9x_dmaselect) {
/* setup DMA transfer for command */
dmasize = clen = ecb->clen;
sc->sc_cmdlen = clen;
sc->sc_cmdp = (caddr_t)&ecb->cmd + 1;
NCRDMA_SETUP(sc, &sc->sc_cmdp, &sc->sc_cmdlen, 0, &dmasize);
/* Program the SCSI counter */
NCR_WRITE_REG(sc, NCR_TCL, dmasize);
NCR_WRITE_REG(sc, NCR_TCM, dmasize >> 8);
if (sc->sc_cfg2 & NCRCFG2_FE) {
NCR_WRITE_REG(sc, NCR_TCH, dmasize >> 16);
}
/* load the count in */
NCRCMD(sc, NCRCMD_NOP|NCRCMD_DMA);
/* And get the targets attention */
NCRCMD(sc, NCRCMD_SELNATN | NCRCMD_DMA);
NCRDMA_GO(sc);
} else {
/* Now the command into the FIFO */
cmd = (u_char *)&ecb->cmd.cmd;
clen = ecb->clen;
while (clen--)
NCR_WRITE_REG(sc, NCR_FIFO, *cmd++);
NCRCMD(sc, NCRCMD_SELNATN);
}
return;
}
if (ncr53c9x_dmaselect && (tiflags & T_NEGOTIATE) == 0) {
size_t dmasize;
ecb->cmd.id =
MSG_IDENTIFY(lun, (tiflags & T_RSELECTOFF)?0:1);
/* setup DMA transfer for command */
dmasize = clen = ecb->clen + 1;
sc->sc_cmdlen = clen;