Date: Wed, 10 Jan 2001 18:11:50 -0000 (GMT) From: Duncan Barclay <dmlb@dmlb.org> To: Warner Losh <imp@harmony.village.org> Cc: mobile@FreeBSD.ORG, onoe@FreeBSD.ORG Subject: Re: memory mapped io for Aironet driver. Message-ID: <XFMail.010110181150.dmlb@computer.my.domain> In-Reply-To: <200101101756.f0AHuXs63066@harmony.village.org>
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Hi
On 10-Jan-01 Warner Losh wrote:
> In message <XFMail.010110083625.dmlb@computer.my.domain> Duncan Barclay
> writes:
>: Sorry this is for the awi driver not aironet.
>
> Does this have any impact on performance? I use awi all the time.
A quick look at awi/am79c930.c says yes:
static void io_read_bytes (sc, off, ptr, len)
struct am79c930_softc *sc;
u_int32_t off;
u_int8_t *ptr;
size_t len;
{
int i;
bus_space_write_1(sc->sc_iot, sc->sc_ioh, AM79C930_LMA_HI,
((off>>8)& 0x7f));
AM930_DELAY(1);
bus_space_write_1(sc->sc_iot, sc->sc_ioh, AM79C930_LMA_LO, (off&0xff));
AM930_DELAY(1);
for (i=0; i<len; i++)
ptr[i] = bus_space_read_1(sc->sc_iot, sc->sc_ioh,
AM79C930_IODPA);
}
verses
static void mem_read_bytes (sc, off, ptr, len)
struct am79c930_softc *sc;
u_int32_t off;
u_int8_t *ptr;
size_t len;
{
bus_space_read_region_1 (sc->sc_memt, sc->sc_memh, off, ptr, len);
}
> Warner
Duncan
---
________________________________________________________________________
Duncan Barclay | God smiles upon the little children,
dmlb@dmlb.org | the alcoholics, and the permanently stoned.
dmlb@freebsd.org| Steven King
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