[U-Boot] [PATCH v6 04/17] net: mdio: Use mb() to be compatible for both ARM and PowerPC

[Alison Wang]

From: Alison Wang <b18965 at freescale.com>

Use mb() instead of sync assembly instruction to be
compatible for both ARM and PowerPC.

Signed-off-by: Alison Wang <alison.wang at freescale.com>
---
Change log:
 v6: Fix checkpatch error.
 v5: No change.
 v4: No change.
 v3: Use mb() to be compatible for both ARM and PowerPC.
     Split from the 0004-arm-ls102xa-Add-etsec-support-for-LS102xA patch.
 v2: Add private mdio read and write support.

 drivers/net/fsl_mdio.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/net/fsl_mdio.c b/drivers/net/fsl_mdio.c
index 8d09f5d..d6b181b 100644
--- a/drivers/net/fsl_mdio.c
+++ b/drivers/net/fsl_mdio.c
@@ -19,7 +19,8 @@ void tsec_local_mdio_write(struct tsec_mii_mng __iomem *phyregs, int port_addr,
 
 	out_be32(&phyregs->miimadd, (port_addr << 8) | (regnum & 0x1f));
 	out_be32(&phyregs->miimcon, value);
-	asm("sync");
+	/* Memory barrier */
+	mb();
 
 	while ((in_be32(&phyregs->miimind) & MIIMIND_BUSY) && timeout--)
 		;
@@ -37,11 +38,13 @@ int tsec_local_mdio_read(struct tsec_mii_mng __iomem *phyregs, int port_addr,
 
 	/* Clear the command register, and wait */
 	out_be32(&phyregs->miimcom, 0);
-	asm("sync");
+	/* Memory barrier */
+	mb();
 
 	/* Initiate a read command, and wait */
 	out_be32(&phyregs->miimcom, MIIMCOM_READ_CYCLE);
-	asm("sync");
+	/* Memory barrier */
+	mb();
 
 	/* Wait for the the indication that the read is done */
 	while ((in_be32(&phyregs->miimind) & (MIIMIND_NOTVALID | MIIMIND_BUSY))
-- 
2.1.0.27.g96db324