m68k: mac - Add SWIM floppy support

It allows to read data from a floppy, but not to write to, and to eject the
floppy (useful on our Mac without eject button).

Signed-off-by: Laurent Vivier <Laurent@lvivier.info>
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>

1 files changed, 9 insertions, 0 deletions

diff --git a/arch/m68k/mac/via.c b/arch/m68k/mac/via.c
index 7d97ba54536e..11bce3cb6482 100644
--- a/arch/m68k/mac/via.c
+++ b/arch/m68k/mac/via.c
@@ -645,3 +645,12 @@ int via_irq_pending(int irq)
 	}
 	return 0;
 }
+
+void via1_set_head(int head)
+{
+	if (head == 0)
+		via1[vBufA] &= ~VIA1A_vHeadSel;
+	else
+		via1[vBufA] |= VIA1A_vHeadSel;
+}
+EXPORT_SYMBOL(via1_set_head);