From: Amadeusz Sławiński <amade@asmblr.net>
Date: Thu, 21 Feb 2013 07:34:11 +0000 (+0000)
Subject: PPC: xnu kernel expects FLUSH to be cleared on STOP
X-Git-Tag: qemu-xen-4.4.0-rc1~6^2~925^2~5^2~5
X-Git-Url: http://xenbits.xensource.com/gitweb?a=commitdiff_plain;h=987422bc4a4c6366ca6a7fbfa38a9920fd7ada2f;p=qemu-upstream-4.4-testing.git

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>
---

diff --git a/hw/mac_dbdma.c b/hw/mac_dbdma.c
index b894ab21a..73d74c2c5 100644
--- a/hw/mac_dbdma.c
+++ b/hw/mac_dbdma.c
@@ -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);