[src/trunk]: src/sys/dev/mca add a comment clarifying the DMA support, g/c th...

[jdolecek <jdolecek%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/7957ecedb372
branches:  trunk
changeset: 517991:7957ecedb372
user:      jdolecek <jdolecek%NetBSD.org@localhost>
date:      Thu Nov 22 20:25:58 2001 +0000

description:
add a comment clarifying the DMA support, g/c the commented
out isa_dmacascade() call
some minor intendation changes, while here

diffstat:

 sys/dev/mca/aha_mca.c |  26 +++++++++++++-------------
 1 files changed, 13 insertions(+), 13 deletions(-)

diffs (57 lines):

diff -r 0f7086ffff28 -r 7957ecedb372 sys/dev/mca/aha_mca.c
--- a/sys/dev/mca/aha_mca.c     Thu Nov 22 19:19:48 2001 +0000
+++ b/sys/dev/mca/aha_mca.c     Thu Nov 22 20:25:58 2001 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: aha_mca.c,v 1.5 2001/11/15 09:48:11 lukem Exp $        */
+/*     $NetBSD: aha_mca.c,v 1.6 2001/11/22 20:25:58 jdolecek Exp $     */
 
 /*
  * Copyright (c) 2000 The NetBSD Foundation, Inc.
@@ -52,7 +52,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: aha_mca.c,v 1.5 2001/11/15 09:48:11 lukem Exp $");
+__KERNEL_RCSID(0, "$NetBSD: aha_mca.c,v 1.6 2001/11/22 20:25:58 jdolecek Exp $");
 
 #include <sys/param.h>
 #include <sys/systm.h>
@@ -118,16 +118,16 @@
        mca_chipset_tag_t mc = ma->ma_mc;
        bus_addr_t iobase;
 
-       apd.sc_irq=(ma->ma_pos[4] & 0x7) + 8;
-       apd.sc_drq=ma->ma_pos[5] & 0xf;
-       apd.sc_scsi_dev=(ma->ma_pos[4] & 0xe0) >> 5;
+       apd.sc_irq = (ma->ma_pos[4] & 0x7) + 8;
+       apd.sc_drq = ma->ma_pos[5] & 0xf;
+       apd.sc_scsi_dev = (ma->ma_pos[4] & 0xe0) >> 5;
 
-       printf(" slot %d irq %d: Adaptec AHA-1640 SCSI Adapter\n",
+       printf(" slot %d irq %d drq %d: Adaptec AHA-1640 SCSI Adapter\n",
                ma->ma_slot + 1,
-               apd.sc_irq);
+               apd.sc_irq, apd.sc_drq);
 
-       iobase=((ma->ma_pos[3] & 0x03) << 8) + 0x30 +
-               ((ma->ma_pos[3] & 0x40) >> 4);
+       iobase = ((ma->ma_pos[3] & 0x03) << 8) + 0x30 +
+                ((ma->ma_pos[3] & 0x40) >> 4);
 
        if (bus_space_map(iot, iobase, AHA_ISA_IOSIZE, 0, &ioh)) {
                printf("%s: can't map i/o space\n", sc->sc_dev.dv_xname);
@@ -138,10 +138,10 @@
        sc->sc_ioh = ioh;
        sc->sc_dmat = ma->ma_dmat;
 
-#ifdef notyet
-       if (apd.sc_drq != -1)
-               isa_dmacascade(mc, apd.sc_drq);
-#endif
+       /*
+        * AHA1640 should be bus-mastering card, should not need any
+        * assistance by MCA DMA controller for DMA transfers.
+        */
 
        sc->sc_ih = mca_intr_establish(mc, apd.sc_irq, IPL_BIO, aha_intr, sc);
        if (sc->sc_ih == NULL) {