Author: sbruno
Date: Mon Feb 2 17:33:00 2015
New Revision: 278104
URL: https://svnweb.freebsd.org/changeset/base/278104
Log:
The linux driver code for the MDIO bus does a read-after-write
which seems to be required on MIPS74k platforms for correct
behaviour.
Reviewed by: adrian
Modified:
head/sys/mips/atheros/if_argevar.h
Modified: head/sys/mips/atheros/if_argevar.h
==============================================================================
--- head/sys/mips/atheros/if_argevar.h Mon Feb 2 17:32:50 2015
(r278103)
+++ head/sys/mips/atheros/if_argevar.h Mon Feb 2 17:33:00 2015
(r278104)
@@ -74,8 +74,20 @@
#define ARGE_CLEAR_BITS(sc, reg, bits) \
ARGE_WRITE(sc, reg, ARGE_READ(sc, (reg)) & ~(bits))
-#define ARGE_MDIO_WRITE(_sc, _reg, _val) \
- ARGE_WRITE((_sc), (_reg), (_val))
+/*
+ * The linux driver code for the MDIO bus does a read-after-write
+ * which seems to be required on MIPS74k platforms for correct
+ * behaviour.
+ *
+ * So, ARGE_WRITE() does the write + barrier, and the following
+ * ARGE_READ() seems to flush the thing all the way through the device
+ * FIFO(s) before we continue issuing MDIO bus updates.
+ */
+#define ARGE_MDIO_WRITE(_sc, _reg, _val) \
+ do { \
+ ARGE_WRITE((_sc), (_reg), (_val)); \
+ ARGE_READ((_sc), (_reg)); \
+ } while (0)
#define ARGE_MDIO_READ(_sc, _reg) \
ARGE_READ((_sc), (_reg))
#define ARGE_MDIO_BARRIER_READ(_sc) ARGE_BARRIER_READ(_sc)
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