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PPC: xnu kernel expects FLUSH to be cleared on STOP 

otherwise it gets stuck in a loop
so clear it when unsetting run when flush is set

void
IODBDMAStop( volatile IODBDMAChannelRegisters *registers)
{

	IOSetDBDMAChannelControl( registers,
	IOClearDBDMAChannelControlBits( kdbdmaRun )
		| IOSetDBDMAChannelControlBits(  kdbdmaFlush ));

DBDMA: writel 0x0000000000000b00 <= 0xa0002000
DBDMA: channel 0x16 reg 0x0
DBDMA:     status 0x00002000

	while( IOGetDBDMAChannelStatus( registers) & (
			kdbdmaActive | kdbdmaFlush))
		eieio();

DBDMA: readl 0x0000000000000b04 => 0x00002000
DBDMA: channel 0x16 reg 0x1
DBDMA: readl 0x0000000000000b04 => 0x00002000
DBDMA: channel 0x16 reg 0x1
DBDMA: readl 0x0000000000000b04 => 0x00002000
DBDMA: channel 0x16 reg 0x1
DBDMA: readl 0x0000000000000b04 => 0x00002000
DBDMA: channel 0x16 reg 0x1
it continues to get printed

}

Signed-off-by: Amadeusz Sławiński <amade@asmblr.net>
[agraf: replace tabs with spaces]
Signed-off-by: Alexander Graf <agraf@suse.de>
This commit is contained in:
Amadeusz Sławiński 2013-02-21 07:34:11 +00:00 committed by Alexander Graf
parent e13da40448
commit 987422bc4a
1 changed files with 4 additions and 0 deletions
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4
hw/mac_dbdma.c
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@ -688,6 +688,10 @@ dbdma_control_write(DBDMA_channel *ch)
if ((ch->regs[DBDMA_STATUS] & RUN) && !(status & RUN)) {
/* RUN is cleared */
status &= ~(ACTIVE|DEAD);
if ((status & FLUSH) && ch->flush) {
ch->flush(&ch->io);
status &= ~FLUSH;
}
}
DBDMA_DPRINTF(" status 0x%08x\n", status);