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arm: stellaris: make MII accesses complete immediately 

When the guest attempts to start an MII register
access via the MCTL register, clear the START bit,
so that when the guest reads it back the register
transaction will be signalled as having completed.
This avoids the guest spinning as it polls the
START bit waiting for it to clear (which it
previously never would).

The  MII registers themselves still aren't implemented,
but at least we can avoid guests spending quite so much
time busy waiting.

Signed-off-by: Michael Davidsaver <mdavidsaver@gmail.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Message-id: 1484938222-1423-1-git-send-email-peter.maydell@linaro.org
[PMM: expand commit message]
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
master
Michael Davidsaver 2017-01-27 15:20:25 +00:00 committed by Peter Maydell
parent 056f43df91
commit d05a86285c
1 changed files with 4 additions and 1 deletions
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5
hw/net/stellaris_enet.c
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@ -416,7 +416,10 @@ static void stellaris_enet_write(void *opaque, hwaddr offset,
s->thr = value;
break;
case 0x20: /* MCTL */
s->mctl = value;
/* TODO: MII registers aren't modelled.
* Clear START, indicating that the operation completes immediately.
*/
s->mctl = value & ~1;
break;
case 0x24: /* MDV */
s->mdv = value;